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43results about How to "No crawling phenomenon" patented technology

Drive control method and system for large-caliber telescope arc motor

InactiveCN102185546ANo need to measure the zero position signalAchieve commutationVector control systemsSingle motor speed/torque controlLow speedRadio telescope
The invention relates to a drive control method and system for a large-caliber telescope arc motor. A DSP (Digital Signal Processor) event manager outputs six paths of drive signals; the six paths of drive signals are output to an intelligent power module after being subjected to optocoupling isolation; the intelligent power module outputs three paths of UVW voltage signals which are approximate to a circular magnetic field and the three paths of UVW voltage signals are added to an arc motor; a current mutual inductor measures each path of current; the current is input into a DSP buffer serial port for processing after subjected to A / D (Analog-to-Digital) conversion; a CPLD (Complex Programmable Logic Device) is used for processing an increment position signal generated by a coder and finishing interfaces of keyboard display, and the like; a rough and fine combined rotating transformer outputs an absolute position signal of the arc motor after passing through a digital converter; the signal is combined with the increment position signal processed by the CPLD to confirm the precise mechanical position of the arc motor; and motor phase conversion is realized after DSP processing. The invention can meet the requirement on a large radio telescope for a super-low speed arc motor and realize long time, super low speed, wide speed regulation and high precision tracking of a large-caliber millimeter wave / submillimeter telescope to a celestial body and has no creeping phenomenon at low speed.
Owner:NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE

Dual-redundancy telescope tracking device for astronomical telescope

A dual-redundancy telescope tracking device for an astronomical telescope comprises a pitch axis set and an azimuth axis set and is characterized in that two sets of tracking systems are respectively adopted for the pitch axis set and the azimuth axis set, and then an azimuth axis dual-redundancy axis set and a height axis dual-redundancy axis set are respectively formed; the two sets of tracking systems are automatically switched through a control system; the two sets of tracking systems in the pitch axis set jointly drive a height axis and share a set of feedback systems and a set of height limiting and braking systems; the two sets of tracking systems in the azimuth axis set jointly drive an azimuth axis and share a set of feedback systems and a set of azimuth limiting and braking systems. The dual-redundancy telescope tracking device has the advantages that bearing capacity is high, friction force is low, power consumption is small, transmission efficiency is high, and rotation accuracy is high; positioning accuracy can reach 20 degrees per second at high speed and reach 0.05'' per second at low speed, and no creeping phenomenon exists; emergency braking and mechanical shock protection can be achieved at the same time through braking and limiting, and the rotation range can be adjusted within the range from 0 degree to 360 degrees in the forward direction and in the reverse direction. The dual-redundancy telescope tracking device can be also used for other heavy high-precision rotating equipment.
Owner:NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE

Front-oscillation center spray pipe load simulating friction loading device

The invention belongs to a friction loading device and specifically discloses a front-oscillation center spray pipe load simulating friction loading device. The device comprises a friction loading hydraulic system and a friction loading mechanism; the friction loading hydraulic system comprises an oil source, a high-pressure ball valve, a high-pressure filter, a proportional pressure reducing valve and an electromagnetic directional valve; the oil outlet of the oil source is communicated with one end of the high-pressure ball valve by use of a pipeline, the other end of the high-pressure ball valve is communicated with one end of the high-pressure filter by use of a pipeline, the other end of the high-pressure filter is communicated with one end of the proportional pressure reducing valve by use of a pipeline, and the other end of the proportional pressure reducing valve is communicated with one end of the electromagnetic directional valve by use of a pipeline; the other end of the electromagnetic directional valve is communicated with the input end of the friction loading mechanism; the friction loading mechanism comprise an outer barrel, a supporting barrel, a friction disc, a rear end cover, a bearing, a hydraulic cylinder, a fixed friction assembly, a movable friction assembly and a rotating shaft. The front-oscillation center spray pipe load simulating friction loading device is capable of simulating the friction load characteristics of a front-oscillation center spray pipe, and is high in friction torque loading accuracy and good in loading stability.
Owner:BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS +1

Ultra-low speed accurate arc electric motor for macrotype astronomical telescope

An ultra-low-speed and ultra-accurate-arc motor for a large-bore astronomical telescope is a large-torque alternating RE permanent-magnet synchronized servo motor. The present invention is composed of a rotor and a stator; the rotor is attached with a permanent magnet and adopts an adhesive structure; the number of pole pairs is 60 pairs and 120 poles; the stator is composed of 15 stator blocks, each block is equivalent to 46.07mm in arc length, each stator consists of 9 complete silicon steel plates and 2 silicon steel plates for reducing the edge effect; each stator adopts 9 plates / 8 poles winding mode and an armature winding is arranged according to UVWUVWUVW from right to left; the motor rotor is composed of 4 rotor blocks and has 120 magnetic steel plates in total; the magnetic steelplate adopts the torque design for reducing tooth space and is provided with a fastening device. The present invention achieves the arc movement directly driven by the large-bore astronomical telescope: low speed 1' / s; high speed 10degrees / s; speed change 30,000:1; positioning precision 0.1'; no creeping phenomenon.
Owner:NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE

Anti-wrapping closed hydrostatic slideway structure of numerical control machine

The invention relates to an anti-wrapping closed hydrostatic slideway structure of a numerical control machine. The anti-wrapping closed hydrostatic slideway structure is characterized in that the lower ends of the left side and the right side of a sliding base are respectively and fixedly provided with a movable guide rail through bolts, fixed guide rails are fixed above two inner sides of a machine body, and three end faces of the movable guide rails are respectively provided with a plurality of oil cavities; and a left oil baffle plate and a right oil baffle plate are respectively arrangedbelow two outer sides of the sliding base and used for preventing static pressure oil from leaking to the machine body. The highest rapid transverse speed of a feeding shaft of the machine is 42m / min, an anti-wrapping rectangular sliding guide rail form is adopted, guidance is carried out by using inner sides of the two guide rails so that the deflection of moving components due to the movement can be reduced and guidance performance and guide precision of the moving components are improved; a liquid static pressure guide rail form is selected in coupling surfaces of the guide rails so as to achieve the advantages of extremely small friction resistance and high transmission efficiency; the moving precision of the guide rails are kept well, and the service life of the guide rails is long; the influence of the change of an operating speed of a working platform on the oil film thickness is smaller, the working platform works stably and has no creeping phenomenon at low speed; and an oil film has a vibration-absorbing function and good vibration performance of the guide rails. The anti-wrapping closed hydrostatic slideway structure has large bearing capacity and high supporting rigidity; and high-precision feeding movement of the machine is realized.
Owner:通用技术集团沈阳机床有限责任公司

Pin roller bearing nut and screw rod pair

The invention relates to a pin roller bearing nut and screw rod pair. The pin roller bearing nut and screw rod pair comprises a screw rod and a nut, wherein the screw rod is externally provided with an outer thread; the pin roller bearing nut and screw rod pair further comprises a pin roller; the pin roller comprises a pin roller body; a roller head part of the pin roller body is in a cone frustum structure; a roller main body of the pin roller body is in a cylindrical structure; the nut is provided with pin roller holes; the roller main body is located in the pin roller holes to form clearance fit; the roller head part is located in a tooth groove of the screw rod to form the clearance fit; the diameter of each pin roller hole is a half of a screw pitch of the screw rod and the pin roller hole is arranged spirally; at least two circles of the pin roller holes are arranged; the pin roller holes are divided into pin roller positioning holes and pin roller adjusting holes; the pin roller positioning holes and the pin roller adjusting holes are arranged on a spiral track at intervals; the centers of the pin roller positioning holes are located on the central line of the spiral track; the centers of the pin roller adjusting holes are upwards or downwards deviated for the distance of one tolerance clearance relative to the axial direction of the central line of the spiral track. The pin roller bearing nut and screw rod pair is high in positioning precision, is great in bearing load, is safe and reliable in performance, is reasonable in structure, is convenient to mount and maintain and is wide in applicable range.
Owner:洪荣华

Ball screw positioning system

The invention discloses a ball screw positioning system. The ball screw positioning system comprises a transmission mechanism and a guiding mechanism, wherein the transmission mechanism consists of a high-speed noiseless ball screw and a high-accuracy nut in a matching manner; the guiding mechanism is used for realizing the guide through the matching of an accurate sliding block assembly structure and the transmission of guiding rails, and an exquisite compact sealing mechanism is selected for matching and using; the structural components are arranged on a high-tensile main body mounting steel beam. The ball screw positioning system not only can realize a high-speed high-accuracy repeated positioning function of a heavy load, but also can prolong the service life of the positioning system, and an optimal movement effect is achieved.
Owner:SHENYANG ZHONGTUO ROBOT EQUIP

Control parameter setting method of speed regulating controller in speed regulating device of torque motor

The invention discloses a control parameter setting method of a speed regulating controller in a speed regulating device of a torque motor; a speed regulating device on which the method is based is composed of a speed regulating order generator, a speed regulating controller, a power driving module, a speed regulating executing mechanism and a speed sensor; the setting method comprises the steps of forming a parameter identifying device of the speed regulating executing mechanism; according to a phase step output response feature of the speed regulating executing mechanism, identifying an equivalent viscous damping coefficient and an equivalent inertia of the speed regulating executing mechanism, dividing the maximal output voltage of the power driving module by the maximal value of a speed regulating order, squaring the obtained quotient, multiplying by 5 times and dividing by the equivalent inertia to obtain an integral coefficient of the speed regulating controller; multiplying the equivalent inertia by the integral coefficient of the speed regulating controller and calculating a square root, multiplying by twice, and subtracting the equivalent viscous damping coefficient from the obtained product to obtain a probability distribution function (PDF) coefficient of the speed regulating controller. According to the control parameter setting method, the controlling parameter of the speed regulating controller is precisely set, and the speed of the torque motor is stably regulated within a wide range.
Owner:JIANGSU UNIV OF SCI & TECH

Direct driving device of self-bearing motor

A direct driving device of a self-bearing motor is provided with a central rotation body, a magnetic suspension bearing and a direct driving motor, wherein the central rotation body is in rotation symmetry, the magnetic suspension bearing is used for restraining the rotation body to do axial and radial movement, the direct driving motor drives the central rotation body, the central rotation body in rotation symmetry forms a rotation workbench, a load is arranged on the rotation workbench, the magnetic suspension bearing for restraining the rotation body to do axial and radial movement comprises an upper axial permanent-magnet bias magnetic suspension bearing, a lower axial permanent-magnet bias magnetic suspension bearing, four axial bias magnetic suspension bearing or bearing units and four axial active magnetic suspension or bearing units, each bearing or bearing unit forms the magnetic suspension bearing system of the device, and moreover, an axial / radial rolling bearing is arrangedand used as a protection bearing. The direct driving device is easy to process and assemble and has the advantages of no friction, low power consumption, high transmission efficiency, high rotation positioning accuracy, and no climbing phenomenon during rotation at an ultralow speed.
Owner:NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE

Bidirectional speed regulation hydraulic control system of oil return cavity based on hydraulic cylinder negative load

The invention relates to a bidirectional speed regulation hydraulic control system of an oil return cavity based on a hydraulic cylinder negative load. The system is characterized by comprising a fueltank, a power pump, an oil source pressure setting valve set and a bidirectional speed regulation hydraulic control loop. According to the system, a speed regulation valve is used, so that the more energy-saving effect is achieved; balance of the negative load can be realized by the speed regulation valve and a balance valve, but if the balance valve is opened, at least hydraulic pressure of 2MPaneeds to be increased in a negative load cavity, and the balance valve is only used for supplementing oil to the negative cavity; and the number of valves for a loop is reduced, for the same system,if the balance valve is used, control on the speed can only be realized by adding the speed regulation valve in an oil inlet cavity, namely, the balance valve can only limit the force but not limit the speed, but the speed regulation valve has the functions of speed limiting and force limiting, only one bridge type bidirectional bottom plate is used, the structure of the system is simple, and thefailure rate is low.
Owner:江苏南方润滑股份有限公司

Corrugated cardboard cutting and pressing integrated machine

The invention discloses a corrugated cardboard cutting and pressing integrated machine comprising a rack, a workbench arranged on the rack and used for placing a corrugated cardboard, a three-dimensional displacement structure arranged on the rack, a laser cutting system used for emitting laser, an indentation wheel structure for indenting the corrugated cardboard and a control device; the laser cutting system, the indentation wheel structure and an image acquisition system are arranged above the workbench and are connected with the three-dimensional displacement structure; and the control device is connected with the three-dimensional displacement structure and is also connected with the laser cutting system and the indentation wheel structure, and the laser cutting system and the indentation wheel structure are driven by the three-dimensional displacement structure to displace. Due to the adoption of the structure, the corrugated cardboard cutting and pressing integrated machine is low in processing cost, short in period, high in cutting precision, precise in location, convenient to mount and debug, high in flexibility, free of jittering during starting and free of creeping phenomena during operating at low speed, so that the micro-feeding can be precisely controlled, and the corrugated cardboard cutting and pressing integrated machine has the advantages of motion stability, high driving efficiency, high precision and good synchronism.
Owner:昆明精研科技有限公司

Anti-wrapping closed hydrostatic slideway structure of numerical control machine

The invention relates to an anti-wrapping closed hydrostatic slideway structure of a numerical control machine. The anti-wrapping closed hydrostatic slideway structure is characterized in that the lower ends of the left side and the right side of a sliding base are respectively and fixedly provided with a movable guide rail through bolts, fixed guide rails are fixed above two inner sides of a machine body, and three end faces of the movable guide rails are respectively provided with a plurality of oil cavities; and a left oil baffle plate and a right oil baffle plate are respectively arranged below two outer sides of the sliding base and used for preventing static pressure oil from leaking to the machine body. The highest rapid transverse speed of a feeding shaft of the machine is 42m / min, an anti-wrapping rectangular sliding guide rail form is adopted, guidance is carried out by using inner sides of the two guide rails so that the deflection of moving components due to the movement can be reduced and guidance performance and guide precision of the moving components are improved; a liquid static pressure guide rail form is selected in coupling surfaces of the guide rails so as to achieve the advantages of extremely small friction resistance and high transmission efficiency; the moving precision of the guide rails are kept well, and the service life of the guide rails is long; the influence of the change of an operating speed of a working platform on the oil film thickness is smaller, the working platform works stably and has no creeping phenomenon at low speed; and an oil film has a vibration-absorbing function and good vibration performance of the guide rails. The anti-wrapping closed hydrostatic slideway structure has large bearing capacity and high supporting rigidity; and high-precision feeding movement of the machine is realized.
Owner:通用技术集团沈阳机床有限责任公司

Torque motor wide range speed regulation numerical control device and control method thereof

The invention discloses a torque motor wide range speed regulation numerical control device and a control method thereof. The control device comprises a numerical control computer, a digital / analog conversion module, a power driving module, a torque motor, a coupler, a mechanical load, a photoelectric encoder and a high-speed counting module, which are sequentially connected in a clockwise direction to form a ring. The control method comprises the steps as follows: initializing an integrator, reading a speed numerical instruction signal and a speed numerical feedback signal, and obtaining an error signal by comparing the speed numerical instruction signal and the speed numerical feedback signal; obtaining an integral product through that errors are accumulated, integrated and multiplied by integral coefficient; obtaining a PDF product through that the speed numerical feedback signal is multiplied by PDF coefficient; and obtaining a numerical quantity difference value through the PDF product is subtracted from the integral product, obtaining an analog quantity control signal by executing digital / analog conversion of the difference value, and controlling a speed regulation executing mechanism via the power driving module, thereby ensuring the favorable performance of speed regulation in a wide range.
Owner:JIANGSU UNIV OF SCI & TECH

Ceramic fiber cutting device

The invention belongs to the field of mechanical equipment, and particularly relates to a ceramic fiber cutting device. The ceramic fiber cutting device is composed of a horizontal rotation mechanism (1), a vertical lifting mechanism (2), a radial adjustment mechanism (3) and a swing mechanism (4); and the radial adjustment mechanism (3) is installed on one side of the horizontal rotation mechanism (1), the vertical lifting mechanism (2) is vertically installed on the radial adjustment mechanism (3) in a penetrating manner, and the lower end of the vertical lifting mechanism (2) is connected with the swing mechanism (4). The structure manner that a circular orbit rotary bridge is combined with a cantilever is adopted in the ceramic fiber cutting device so that the span of a cutting machine can be effectively reduced through the structure, the overall size can be decreased, and meanwhile the cutting accuracy can be guaranteed. The overall weight of the rotation mechanism, a radial feeding mechanism, a cantilever support structure and the swing mechanism is supported by outer rings of four rolling bearings, when the rotary bridge rotates, the outer rings of the bearings move on the end plane of a large gear ring, the friction coefficient is small, dynamic coefficients are approximate to static friction coefficients, the crawl phenomenon is avoided, motion is light and flexible, and the positioning accuracy is high.
Owner:天津市广盛源新型建材科技有限公司

Composite sliding seat matched with guide rail of machine tool

The invention relates to a composite sliding seat matched with a guide rail of a machine tool. The sliding seat comprises an upper supporting surface, a lower pressing plate surface and side faces, wherein the upper supporting surface and the lower pressing plate surface of the sliding seat are provided with oil cavities which make the guide rail and the sliding seat form a static pressure fit; and the side faces are provided with a plastic-attached layer respectively. The sliding seat combines the advantages of sliding seats in a static pressure form and in a plastic-attached mode, is low in friction coefficient, can make the driving power greatly reduced, is light and flexible in motion and has no crawling phenomenon at a low speed; working surfaces of the sliding seat and the guide rail are not directly contacted, abrasion hardly occurs, the original precision can be kept for a long time, the sliding seat has long service life, high bearing capacity, high rigidity and low frictional heating, the guide rail is low in temperature rise, the oil has vibration absorbing function, and the sliding seat is high in vibration resistance, simple in structure, high in stability, and convenient to machine, assemble, repair and adjust.
Owner:TDG MACHINERY TECH

Sealing ring for expansion valves of air conditioners of automobiles and method for preparing sealing ring

The invention discloses a sealing ring for expansion valves of air conditioners of automobiles and a method for preparing the sealing ring, and relates to the technical field of accessories for air conditioners of automobiles. The sealing ring for the expansion valves of the air conditioners of the automobiles comprises, by weight, 100 parts of methylvinyl silicone rubber, 5-10 parts of hydroxyl silicone oil, 20-50 parts of gas-phase white carbon black, 8-15 parts of diatomaceous earth, 2-5 parts of light magnesium oxide, 5-10 parts of beta-cyclodextrin inclusion cashew nut shell oil, 0.5-1 part of dioctyl phthalate, 1-2 parts of peroxide vulcanizing agents, 0.5-1 part of zinc methacrylate and 0.5-1 part of flame retardants. The sealing ring and the method have the advantages that the sealing ring prepared by the aid of the method is excellent in oil resistance, abrasion resistance and self-lubricating property, low in frictional resistance, good in elasticity and long in service life and can be automatically elastically compensated when slightly abraded, and good sealing effects can be realized.
Owner:SHENZHEN WOHAISEN TECH CO LTD

Dual Redundant Telescope Tracking Device for Astronomical Telescopes

A dual-redundancy telescope tracking device for an astronomical telescope comprises a pitch axis set and an azimuth axis set and is characterized in that two sets of tracking systems are respectively adopted for the pitch axis set and the azimuth axis set, and then an azimuth axis dual-redundancy axis set and a height axis dual-redundancy axis set are respectively formed; the two sets of tracking systems are automatically switched through a control system; the two sets of tracking systems in the pitch axis set jointly drive a height axis and share a set of feedback systems and a set of height limiting and braking systems; the two sets of tracking systems in the azimuth axis set jointly drive an azimuth axis and share a set of feedback systems and a set of azimuth limiting and braking systems. The dual-redundancy telescope tracking device has the advantages that bearing capacity is high, friction force is low, power consumption is small, transmission efficiency is high, and rotation accuracy is high; positioning accuracy can reach 20 degrees per second at high speed and reach 0.05'' per second at low speed, and no creeping phenomenon exists; emergency braking and mechanical shock protection can be achieved at the same time through braking and limiting, and the rotation range can be adjusted within the range from 0 degree to 360 degrees in the forward direction and in the reverse direction. The dual-redundancy telescope tracking device can be also used for other heavy high-precision rotating equipment.
Owner:NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE

Diamond cutter slow-feeding and fast-retracting device based on air static pressure guide rail component

ActiveCN102528660BQuick and precise slow forward and fast rewind operationQuickly and accurately realize slow forward and fast rewind operationGrinding drivesOther manufacturing equipments/toolsEngineeringMachine tool
The invention relates to a diamond cutter slow-feeding and fast-retracting device based on an air static pressure guide rail component and belongs to the technical field of ultra-precision processing. Up to now, no slow-feeding and fast-retracting device capable of realizing the high-precision grinding and the fast in-suit measurement of a diamond cutter exists. The air static pressure guide railcomponent and the slow-feeding and fast-retracting device are arranged on a machine tool base, a long hole of the machine tool base is communicated with a long groove, an extending rod penetrates into the long hole and is supported through a bearing support seat, the bearing support seat is fixedly connected with the long groove, one ends of a fan-shaped baffle block and a short connecting rod are respectively nested on the extending rod, a position limiting block is fixedly arranged on a bearing support seat and is provided with an inclined surface, the fan-shaped baffle block and the position limiting block are in relative arrangement in the radial direction of the extending rod, a long connecting rod is arranged in the long groove, rotating pairs are formed between a short connecting rod and the long connecting rod as well as between the long connecting rod and a guide rail connecting element, the guide rail connecting element is fixedly connected with a slide carriage of the air static pressure guide rail component, and the extending rod is fixedly connected with an operation hand wheel. The diamond cutter slow-feeding and fast-retracting device is used for the high-precision grinding and the slow-feeding and fast-retracting operation of the diamond cutter.
Owner:HARBIN INST OF TECH

Tool unclamping device using ball screw for transmission

The invention discloses a tool unclamping device using a ball screw for transmission. The tool unclamping device comprises a cylinder body and a piston rod, the cylinder body is provided with a front cover and a rear cover, a lead screw is arranged in the cylinder body, the lead screw is connected with a lead screw nut in a sleeving mode, the lead screw is connected with a driving mechanism for driving the lead screw to rotate, a containing cavity for containing the other end of the lead screw is formed in the piston rod, the piston rod is connected with the lead screw nut through a piston, a guide rod penetrates through the piston, the front cover is connected with a pressurizing cylinder, the pressurizing cylinder is provided with a pressurizing cylinder end cover, a connector opening is formed in the side wall of the pressurizing cylinder end cover, the piston rod can penetrate through the front cover to enter into the pressurizing cylinder, and an oil cavity is formed from the front end of the piston rod to the connector opening. According to the device, thrust is generated through spiral movement of the lead screw and the lead screw nut to achieve movement of the piston rod, the lead screw and the lead screw nut are good in transmission stability, high in precision and free of creeping, the whole unclamping device operates stably, the operation stability of an execution element is guaranteed, the unclamping device is free of noise pollution, suitable for occasions with high precision requirements and suitable for popularization and application, and the device is especially suitable for machining centers.
Owner:WUXI JUFAN TECH

Wide range speed regulation device for torque motor

The invention discloses a wide range speed regulation device for a torque motor. The device consists of a speed regulation command generator, a speed regulation controller, a power drive module, a speed regulation actuator and a speed sensor; the speed regulation controller consists of a comparator, an integrator, an integral coefficient multiplier, a subtracter, a PDF (Portable Document Format) coefficient multiplier, a PDF (Portable Document Format) follower, a feedback follower and an integral saturation limiter; the speed regulation actuator consists of the torque motor, a coupling and a mechanical load, wherein the comparator, the integrator, the integral coefficient multiplier, the subtracter, the power drive module, the torque motor, the coupling, the mechanical load, the speed sensor and the feedback follower are annularly connected in a clockwise direction; the comparator is also connected with the speed regulation command generator; the subtracter is also connected with the speed regulation sensor by the PDF coefficient multiplier and the PDF follower; and the integral saturation limiter is respectively connected with the output of the integral coefficient multiplier and the integrator. The wide range speed regulation device provided by the invention has the advantages of wide speed regulation range from zero to thousands of turns and excellent speed regulation performance.
Owner:JIANGSU UNIV OF SCI & TECH

Control parameter setting method of speed regulating controller in speed regulating device of torque motor

The invention discloses a control parameter setting method of a speed regulating controller in a speed regulating device of a torque motor; a speed regulating device on which the method is based is composed of a speed regulating order generator, a speed regulating controller, a power driving module, a speed regulating executing mechanism and a speed sensor; the setting method comprises the steps of forming a parameter identifying device of the speed regulating executing mechanism; according to a phase step output response feature of the speed regulating executing mechanism, identifying an equivalent viscous damping coefficient and an equivalent inertia of the speed regulating executing mechanism, dividing the maximal output voltage of the power driving module by the maximal value of a speed regulating order, squaring the obtained quotient, multiplying by 5 times and dividing by the equivalent inertia to obtain an integral coefficient of the speed regulating controller; multiplying the equivalent inertia by the integral coefficient of the speed regulating controller and calculating a square root, multiplying by twice, and subtracting the equivalent viscous damping coefficient from the obtained product to obtain a probability distribution function (PDF) coefficient of the speed regulating controller. According to the control parameter setting method, the controlling parameter of the speed regulating controller is precisely set, and the speed of the torque motor is stably regulated within a wide range.
Owner:JIANGSU UNIV OF SCI & TECH

Friction Loading Device for Load Simulation of Front Swing Center Nozzle

The invention belongs to a friction loading device and specifically discloses a front-oscillation center spray pipe load simulating friction loading device. The device comprises a friction loading hydraulic system and a friction loading mechanism; the friction loading hydraulic system comprises an oil source, a high-pressure ball valve, a high-pressure filter, a proportional pressure reducing valve and an electromagnetic directional valve; the oil outlet of the oil source is communicated with one end of the high-pressure ball valve by use of a pipeline, the other end of the high-pressure ball valve is communicated with one end of the high-pressure filter by use of a pipeline, the other end of the high-pressure filter is communicated with one end of the proportional pressure reducing valve by use of a pipeline, and the other end of the proportional pressure reducing valve is communicated with one end of the electromagnetic directional valve by use of a pipeline; the other end of the electromagnetic directional valve is communicated with the input end of the friction loading mechanism; the friction loading mechanism comprise an outer barrel, a supporting barrel, a friction disc, a rear end cover, a bearing, a hydraulic cylinder, a fixed friction assembly, a movable friction assembly and a rotating shaft. The front-oscillation center spray pipe load simulating friction loading device is capable of simulating the friction load characteristics of a front-oscillation center spray pipe, and is high in friction torque loading accuracy and good in loading stability.
Owner:BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS +1

Roller bearing nut screw pair

The invention relates to a pin roller bearing nut and screw rod pair. The pin roller bearing nut and screw rod pair comprises a screw rod and a nut, wherein the screw rod is externally provided with an outer thread; the pin roller bearing nut and screw rod pair further comprises a pin roller; the pin roller comprises a pin roller body; a roller head part of the pin roller body is in a cone frustum structure; a roller main body of the pin roller body is in a cylindrical structure; the nut is provided with pin roller holes; the roller main body is located in the pin roller holes to form clearance fit; the roller head part is located in a tooth groove of the screw rod to form the clearance fit; the diameter of each pin roller hole is a half of a screw pitch of the screw rod and the pin roller hole is arranged spirally; at least two circles of the pin roller holes are arranged; the pin roller holes are divided into pin roller positioning holes and pin roller adjusting holes; the pin roller positioning holes and the pin roller adjusting holes are arranged on a spiral track at intervals; the centers of the pin roller positioning holes are located on the central line of the spiral track; the centers of the pin roller adjusting holes are upwards or downwards deviated for the distance of one tolerance clearance relative to the axial direction of the central line of the spiral track. The pin roller bearing nut and screw rod pair is high in positioning precision, is great in bearing load, is safe and reliable in performance, is reasonable in structure, is convenient to mount and maintain and is wide in applicable range.
Owner:洪荣华

Digital follow-up device for mechanized equipment and control method thereof

InactiveCN102929293ASimple structureUnique control algorithmControl using feedbackElectricityIntegrator
The invention discloses a digital follow-up device for mechanized equipment and a control method thereof. The digital follow-up device is composed of a digital control computer, a digital-to-analog conversion module, a power driving module, a driving motor, a coupling, the mechanized equipment, an optical-electricity encoder and a high-speed counting module which are sequentially and annularly connected along the clockwise direction. The control method of the digital follow-up device comprises steps of initializing an integrator, reading follow-up command signals and feedback signals, comparing the follow-up command signals and the feedback signals to obtain error signals, accumulating integrations of the error signals to be multiplied by integration coefficients to obtain integration products, enabling feedback signals to be multiplied by probability distribution function (PDF) coefficients to obtain a PDF product, conducting differences on the feedback signals to be multiplied by a difference coefficient to obtain a difference product, enabling the difference product to subtract the PDF product and then subtract the difference product, conducting overrun distinguishing and processing on an obtained difference value, and finally conducting digital-to-analog conversion on the difference value to obtain analog quantity control signals to control the mechanized equipment through the power driving module.
Owner:JIANGSU UNIV OF SCI & TECH

Short-distance measuring device for paperboard strength detection

The invention discloses a short-distance measuring device for paperboard strength detection. The device comprises a first installation plate, a sample paper cutting mechanism, a strength detection mechanism and a discharging mechanism, the sample paper cutting mechanism and the strength detection mechanism are fixed to the two sides of the upper end of the first installation plate, the dischargingmechanism is arranged on the strength detection mechanism, a displayer is arranged on the strength detection mechanism, and a thermal printer is arranged on one side of the displayer. The paperboardslitting machine realizes automatic slitting of paperboards, automatically crushes paper slips, automatically detects pressure values, records and analyzes the pressure values, automatically discharges the detected paper slips, and is high in automation degree, high in working efficiency and high in detection precision.
Owner:DONGGUAN UNIV OF TECH
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