61results about How to "Safe and reliable structural design" patented technology

The invention relates to a double hobbing cutter rock hobbing comprehensive test bed, which relates to rock tunnel boring machine hobbing cutter experimental equipment. The double hobbing cutter rock hobbing comprehensive test bed comprises a hydraulic system, a worktable, cutters, cutter holders, guide rails, a test system, a control system and the like. The worktable is pulled by a hydraulic system to move quickly and a test piece drives the hobbing cutters to hob rocks, the position of the test bed in the direction vertical to the motion direction of the worktable is adjusted by a screw, and the pressure plates at two ends of the worktable lock the test piece. The cutter holders are connected with cutter hydraulic push / pull rods through connecting discs; seven steel-embedding sliding blocks on four sides are matched with the steel-embedding guide rails on a test bed body to absorb the impact exerted by lateral loads on the hydraulic push rods; the hydraulic system drives the entire cutter holders to enter penetration regulation and keep a hobbing pressure. The test bed is reasonable, simple and safe in structural design and high in bearing capacity and impact strength.

The invention discloses a method for calculating triangular resistance loads of a shield tunnel model structure.The method comprises the steps that S1, due to the fact that a pipe sheet structure calculating model belongs to a small-deformation linear elasticity problem, resistance displacement y at the horizontal diameter position of a tunnel ring can be regarded as superposition of horizontal deformation caused by loads except for triangular deformation and horizontal deformation caused by the triangular resistance loads, y is set to be equal to U(q1, qG, e1, e2, g, qw)-U(ky), all the parameter are substituted into the formula, and a correlation coefficient determined by back arch soil pressure qG is 0.3145; S2, based on correct arc-shaped back arch soil pressure derivation, the coefficient 0.3145 is substituted to the formula, and the set resistance displacement (see the formula in the description) at the horizontal diameter position of the tunnel ring can be obtained.Based on correct arc-shaped back arch soil pressure, the precise triangular resistance displacement calculating formula is derived, a basis is provided for correct calculation of the internal force of the shield tunnel model structure, and the technical problem that an existing triangular resistance displacement calculating formula does not conform to the tunnel back arch soil pressure shape is solved.

The curtain wall connecting unit includes hanging pieces to be fixed onto the expansion bolt in the curtain wall block, and bearing boards to be connected to the keel structure by means of binding bolt and stopping washer. It features the upper hanging piece with adjusting bolt for the height regulation of the curtain wall block, the upper bearing board hung flexibly to the upper hanging piece with adjusting hole in the horizontal wall, the lower bearing board with adjusting slot in the vertical walls for adjusting the distance of the lower hanging piece to keel structure, and the hanging connection between the bearing boards and hanging pieces. The present invention has simple and safe installation and convenient regulation.

The invention discloses a demolition construction method for an overpass existing line arch bridge. The demolition construction method comprises the steps: 1, erecting a protective shed frame; 2, carrying out static crushing demolition on the arch blasting demolition structure; 3, manually removing the blasting protection layer; 4, cutting the removed arch ring; 5, hoisting the arch ring to be hoisted; and 6, dismantling the under-arch structure. The method is simple, reasonable in design, easy and convenient to construct and good in using effect; the protection shed frames fixed to the frontside and the rear side of the removed arch bridge are adopted for effective protection, meanwhile, the structure on the arch of the removed arch bridge is removed in the mode that static crushing andmanual chiseling are combined, it is guaranteed that a plain concrete arch ring cannot be damaged in the static crushing process, and an existing spanned railway line cannot be disturbed. After the arch ring is exposed, the removed arch ring is cut and decomposed through a rope saw and then hoisted and removed, then the under-arch structures on the left side and the right side are rapidly removed,the construction period can be effectively shortened, the arch bridge removing efficiency is improved, and the removing process is safe and reliable.

The invention relates to a large span structure CAD assembly analysis method, which is characterized in that an upper large span structure module 1 and a lower concrete structure module 2 form an assembly module 3 to enter into a finite element analysis model. Structure forms of the upper large span structure comprise four span structures, namely grid structure, reticulated shell structure, cable structure and membrane structure. The assembly analysis is making use of finite element analysis software (comprising SAP2000, ETABS, MIDAS, ANSYS, ABQUS) to analyze deformation stress performance of the assembly module formed by the upper and lower structures in the effect of gravity, wind, earthquake and temperature load. The assembly analysis also considers an influence of the lower concrete structure stiffness degradation caused by concrete creep when analyzing, so as to guarantee safety of upper steel structure. The invention has the advantages of safety and reliability, economic and reasonable.

The invention discloses a photocatalytic evaluation characterization device and method for carbon dioxide reduction. The device comprises a photocatalysis mechanism, a gas path mechanism, a water vapor generation mechanism and a gas chromatograph, the photocatalysis mechanism comprises a blast drying box, a light source part, a catalytic reactor and a vacuum pump, the catalytic reactor comprises areaction tank, a four-corner supporting frame, an inlet pipeline part and an outlet pipeline part, and the four-corner supporting frame comprises an activated carbon carrying net and supporting legs.The method comprises the following steps of: 1, preparing a photocatalyst; 2, connecting and debugging the device; 3, filling the photocatalyst; 4, performing preparation before reaction; 5, carryingout photocatalytic reduction reaction on carbon dioxide; 6, detecting the concentration of methane gas and the concentration of carbon monoxide gas; and 7, obtaining the optimal photocatalyst for preparing methane and the optimal photocatalyst for preparing carbon monoxide. The photocatalytic evaluation characterization device and method for carbon dioxide reduction are reasonable in design, andimprove the accuracy of photocatalytic evaluation characterization of carbon dioxide reduction.

The invention relates to a liftable medical nursing bed capable of using a motor to control automatic lifting of the bed surface, which comprises a pedestal and a bed frame, wherein a hinge lug connected with the lower parts of a front middle cross beam and a rear middle cross beam is hinged with two ends of an upper end shaft of an n-shaped support frame respectively and rotates around the two ends respectively; one end of a moment arm of the n-shaped support frame is hinged with four hinging bases positioned on a pedestal cross beam respectively and rotates around the hinging bases; the upper end shafts of the n-shaped support frame are provided with shaft connecting lugs at intervals; two ends of a synchronous support frame are connected with the shaft connecting lugs in the n-shaped support frame through a connecting shaft respectively; and the fixed end of a motor push rod retractable device is hinged with the hinging bases on the bed frame, while the retractable end is hinged with the hinging base on the cross beam at one end of the synchronous support frame. The liftable medical nursing bed has the advantages that a four-point hinge mechanism consists of the motor push rod retractable device, the n-shaped support frame and the synchronous support frame not only achieves the aim of using one motor push rod to control the rising and the falling of the whole bed frame, but also has stable and reliable rising and falling speed.

The invention discloses an omnibearing anti-collision device suitable for an aerial working platform. The omnibearing anti-collision device suitable for the aerial working platform comprises a walking base, a hoisting mechanism, a work platform, first collision detection modules, a plurality of buffer modules, a plurality of second collision detection modules and a controller, wherein the bottom of the hoisting mechanism is arranged on the walking base, the working platform is arranged at the top of the hoisting mechanism, the first collision detection modules are arranged on the upper side of the working platform in a foldable manner, the multiple buffer modules are arranged on the peripheral side edges of the walking base and / or the peripheral side edges of the operation platform correspondingly, the multiple second collision detection modules are arranged on the multiple buffer modules correspondingly, the multiple second collision detection modules are used for detecting obstacles, the controller is used for receiving signals detected by the first collision detection modules and / or the second collision detection modules and controlling the motion state of hoisting or walking of the aerial working platform. The anti-collision measures adopted by the omnibearing anti-collision device suitable for the aerial working platform are comprehensive, and the technical problem that in the prior art, an anti-collision structure is single in design, and has limitation is solved.

Disclosed is a multifunctional touch-screen industry tablet computer provided with audio and multiple automatic control interfaces. An industrial-control motherboard, a TFTLCD (thin film transistor liquid crystal display), a DC (direct-current) power source, a memory, an electronic hard disk, an emergency stop control switch, a qualified product control switch, an unqualified product control switch, a touch screen controller, a touch screen, an induction control keyboard board and an output amplifier circuit are all integrated in the multifunction touch-screen industry tablet computer. An induction control keyboard array is controlled through a digital input port which can simultaneously receive station induction sensing signals of a production line member; a station control relay of the production line member is directly driven through the digital output port via the output amplifier circuit. By the application of an open-type system, a flexible component structure and the standard peripheral interfaces, the multifunctional touch-screen industry tablet computer is enabled to adapt to docking with an existing system of an enterprise. Standard products are adopted in main components, so that product quality is reliable, system upgrade is facilitated, and convenience and easiness in component maintenance are achieved.

The invention discloses a hog house slatted floor, and belongs to auxiliary equipment for hog houses. The hog house slatted floor structurally comprises a floor body, strip-shaped leaks are formed in the floor body, a leak hole is formed in a corner of the floor body, the leak hole is a stepped hole, a leak hole cover is arranged in the leak hole, the leak hole cover is matched with the upper portion of the leak hole, the upper surface of the leak hole cover is flush with the upper surface of the floor body, the center of the leak hole cover is provided with a small hole or an imbedded hook, the hook is embedded in the leak hole cover and the upper surface of the hook is flush with the upper surface of the leak hole cover. Compared with the prior art, the hog house slatted floor solves the problems that due to the fact that in a slatted floor, it is difficult for excrement to drop down, the sanitation condition of the living environment of swinery is poor and unsafe; the pig excrement which is difficult to remove becomes easy to remove, time, mampower and materials are saved, and therefore the hog house slatted floor has good popularization and application value.

The invention discloses an all-around in-place walking machine which is divided into an in-place walking device and a display device. The whole structure design is stable and safe. Meanwhile, according to details of some structures, unnecessary structures are removed, resources are saved, environmental protection is achieved, the forward motion effect similar to an electric running machine can beachieved, a display integrator is independent, no redundant circuit exists, the structure is simple, maintenance is easy, the using state and the using degree of the walking machine can be detected through vibration to judge the walking mileage, data is more accurate, the modes of an inner sealing opening and an outer sealing opening is adopted, belts of different lines on the surface can be conveniently replaced, and meanwhile the stability is improved.

The invention discloses a method for calculating limit stress increment of an external prestressing reinforcement variable cross-section continuous rigid frame. According to the method, a continuous rigid frame structure system is considered, and an actual damage mode of a continuous beam reinforcing system in a limit state is used for reference, so that the number of plastic hinges in the limit state of the variable-cross-section continuous rigid frame reinforcing system and a plastic hinge corner when a middle fulcrum cross section fails are corrected on the basis of a standard formula; the finally obtained formula has good applicability to the calculation of the external beam limit stress of the variable cross-section continuous rigid frame, the maximum error of the calculation result is within 10%, the engineering calculation precision requirement can be met, and the calculation result enables the structural design to be safe. Meanwhile, the calculation formula has the advantages of being simple in form, high in calculation efficiency and precision, convenient to apply by engineering technicians and the like, and beneficial reference can be provided for the design of the external prestressing reinforcement variable cross-section continuous rigid framework.

The invention discloses a feeding, quantitative packing and press-fitting production line for spice. The production line comprises a first conveyor, a feeding device, a weighing device and a press-fitting device, the feeding device comprises a spiral conveyor, a lifting machine, a storage bin and a first rotary feeding valve, the weighing device comprises a weighing bin with a skirt edge, a weighing support, weighing modules and a second rotary feeding valve, the outlet end of the spiral conveyor is connected with a feeding port of the lifting machine, the outlet of the upper end of the lifting machine communicates with the inlet of the storage bin, the storage bin is installed above the first conveyor conveying belt through a storage bin installation support, a receding groove matched with the body part of the weighing bin is formed in the middle of the weighing support, the weighing bin is erected on the weighing modules on the two sides of the weighing support through the skirt edge, an outlet pipeline of the storage bin communicates with the weighing bin through the first rotary feeding valve, and the second rotary feeding valve is arranged on an outlet pipeline of the weighingbin. According to the feeding, quantitative packing and press-fitting production line for the spice, box opening, feeding, quantitative weighing and press-fitting packaging can be completed at one time.

The invention provides an ammonia gas recovery structure and an ammonia gas recovery method for a fly ash maintenance workshop. The body health of production personnel in the workshop is guaranteed, corrosion of equipment in the workshop is reduced, ammonia gas can be recycled, and secondary pollution is reduced. An ammonia gas detector is mounted in the fly ash curing workshop; a collecting air pipe mounted in the fly ash maintenance workshop is connected with a washing tower; a first-stage packing section, a first-stage spraying section, a second-stage packing section, a second-stage spraying section and a demisting plate are sequentially arranged in the washing tower from bottom to top; the liquid storage tank is connected with a spraying water pipe through a circulating pump, and the spraying water pipe is connected with the first-stage spraying section and the second-stage spraying section; the desalted water input pipeline is connected with the liquid storage tank; the washing tower is connected with the inlet of a centrifugal fan, and the centrifugal fan is connected with the fly ash maintenance workshop; the liquid storage tank is connected with the desalted water pump, thedesalted water pump is connected with the filter, the filter is connected with the desalted water tank, the desalted water tank is connected with the transfer pump, and the transfer pump is connectedwith the SNCR system softened water tank.

The invention discloses a polishing device for bamboo summer sleeping mat machining. The polishing device for bamboo summer sleeping mat machining comprises a first drive motor, a second drive motor,a polishing machine, a shearing machine, seal doors and a dust collector. The seal doors comprise an inlet door and an outlet door. The seal doors are movably installed on the two sides of equipment through hinges. The dust collector is fixed to the middle of a fixing plate through bolts. The equipment outer wall of the side, close to the inlet door, of the dust collector is provided with a PLC, atouch controller and a rotation speed meter. The polishing machine and the first drive motor are both fixed to the lower end of the dust collector through bolts. The lower end of the portion, betweenthe polishing machine and the inlet door, of the fixing plate is fixedly provide with the shearing machine through bolts. The conveyer belt is arranged below the shearing machine. The conveyer belt is fixedly installed on the base through bolts. The polishing device for bamboo summer sleeping mat machining has the advantages of being reasonable in structural design, safe, convenient to use and the like and can be generally used and popularized.

The invention relates to an electrically-heating water dispenser type rice water separating electric rice cooker. The electric rice cooker comprises a shell, an upper cover, a lower cover, a water outlet electromagnetic pump and a water delivery electromagnetic pump, wherein the water outlet electromagnetic pump and the water delivery electromagnetic pump are fixedly arranged at the position of an upper cover fixed seat; an water outlet pipe and a water delivery pipe is connected with the sleeve mouth end of the water outlet pipe; a water delivery conduit and a water outlet conduit are connected with the sleeve mouth end of the water outlet pipe, the sleeve mouth end of the water delivery pipe and the mouth end of the electromagnetic pump; the orifice end of the water delivery pipe is near the bottom end of a water storage bucket; and the orifice end of the water outlet pipe is near the bottom end of a boiler liner. The electric rice cooker is characterized in that: the water outlet electromagnetic pump and the water delivery electromagnetic pump are fixedly arranged at the position of the upper cover fixed seat; the orifice end of the water outlet pipe is near the bottom end of the boiler liner; and the orifice end of the water delivery pipe is near the bottom end of the water storage bucket. The invention provides a practical technique of the electric rice cooker capable of automatically delivering water and separating the rice water.

The invention discloses a method for designing normal section bearing capacity reinforcing bars of a shear wall column with special-shaped end columns, which mainly comprises the following steps: simulating the shear wall column with the special-shaped end columns by adopting an entity unit during modeling, and performing finite element calculation and analysis on an integral structure model; finding out the centroid position of the overall combined wall section, and analyzing and counting to obtain the most unfavorable design combination internal force of the overall section; carrying out linear buckling modal stability analysis on the wall column; calculating the average axial compression ratio of the whole wall column section, and determining the wall column edge component type and the reinforcement area of each part preliminarily; drawing a related bearing capacity skeleton curve; and drawing the relevant load effect intersection points into the corresponding bearing capacity framework curves to judge whether the bearing capacity reinforcing bars of the normal section of the wall column meet the design requirements or not. According to the calculation method provided by the invention, the influence of section shape characteristics of the special-shaped end column on a wall column reinforcement calculation result is considered; the joint stress of the special-shaped end column and the shear wall column is considered, the reinforcement result can ensure the safety of the structural design of the wall column, and certain practicability is achieved in the actual engineering design.

The invention discloses a piston rubber coating production line, and aims to provide the piston rubber coating production line which is efficient in production, high in yield and high in applicability, and the key points of the technical scheme are as follows: the piston rubber coating production line is sequentially provided with a to-be-processed product conveying line for conveying a piston ring; a turntable used for conveying a rubber sheet; a pre-rubber-coating device used for pre-rubber-coating the rubber sheet on the piston ring; a forming device used for forming the pre-encapsulated piston ring; a transfer device used for transferring the rubber sheet and the piston ring to the pre-rubber-coating device, transferring the pre-rubber-coated piston ring to the forming device and transferring the piston rubber coating to a finished product conveying line; and a rotary frame provided with a feeding station, a machining station, a finishing station and a material taking station, a pressing head correspondingly arranged above the machining station and has a vertical reciprocating motion process, and a core rod used for installing the rubber sheet. The invention is applicable to the technical field of damper piston production equipment.

The invention discloses a child bed capable of vertically lifting and storing. The child bed comprises child beds, an outer lifting support mechanism and an inner support mechanism, wherein a liftingmotor drives a lifting drive mechanism to drive two outer support frames to do lifting reciprocating movement; an outer elastic drive motor drives an outer elastic drive mechanism to drive the two outer support frames to horizontally move in opposite or reverse directions; an inner elastic drive motor drives an inner elastic support mechanism to drive two inner support frames to horizontally movein opposite or reverse directions; and the lifting motor, the outer elastic drive motor and the inner elastic motor are controlled to respectively drive the lifting drive mechanism, the outer elasticdrive mechanism and the inner elastic drive mechanism to do linkage movement so as to realize the lift-up storage and the lift-down release of the child beds through the synchronous reverse horizontalmovement between the outer support frame and the inner support frame and the lifting movement of the outer support frame. The child bed of the invention has the beneficial effects that the push and the pull are convenient; the lift-up storage and the lift-down release of the child beds are electrified, quick and labor-saving; an overall vertical lifting structure is adopted, so that the floor area is small and the storage space is saved; and therefore, the child bed is suitable for popularization and application in kindergartens.

The invention provides a fire coal self-controlled boiler, comprising a boiler body and a first return combustion chamber, a second return heat transfer chamber and a third return smoke chamber which are arranged in the boiler body, the first return combustion chamber and the second return heat transfer chamber are communicated by adopting a plurality of first return smoke and fire tubes which are vertically arranged, the second return heat transfer chamber and the third return smoke chamber are communicated by adopting a plurality of third return smoke and fire tubes which are vertically arranged, a plurality of transverse water tubes are arranged in the second return heat transfer chamber, a plurality of transverse water tubes are arranged in the third return smoke chamber, the transverse water tubes in the second return heat transfer chamber are communicated with the transverse water tubes in the third return smoke chamber; a smoke outlet tube which is led out of the boiler body and provided with a smoke outlet is arranged on the third return smoke chamber, and a draft inlet is formed on the smoke outlet tube. The fire coal self-controlled boiler has high combustion efficiency and rapid heat transfer and can automatically control the temperature of outlet water and reduce the temperature of exhaust smoke, the smoke emission is in line with DB11 / 139-2007 emission standards of air pollutants for boiler, and the pollution is reduced.

The invention belongs to a dry powder and foam dual-purpose fire extinguishing device which comprises a trolley (1). A gas cylinder and barrel fixing mechanism (2) is installed inside the trolley (1); a gas cylinder (10) is fixed to the right side of the interior of the gas cylinder and barrel fixing mechanism (2) through a gas cylinder fixing belt (11); a gas cylinder valve (9) is installed at the upper end of the gas cylinder (10); a pressure reducer (8) is installed on the gas cylinder valve (9); and a spray gun (7) is installed at the top end of the trolley (1) through a spraying pipe (6). The dry powder and foam dual-purpose fire extinguishing device is characterized in that a barrel and barrel cylinder valve mechanism (3) is installed inside the gas cylinder and barrel fixing mechanism (2); and an electronic control system (4) and a pneumatic control system (5) are installed on the upper portion of the barrel and barrel cylinder valve mechanism (3). A dry powder barrel and a foam liquid barrel contain dry powder medicament and foam medicament correspondingly, and the fire can be extinguished by selecting corresponding medicament according to the field situations; and the spraying time is long, operation is easy and convenient, and the fire extinguishing effect is good.

The invention relates to a liftable medical nursing bed capable of using a motor to control automatic lifting of the bed surface, which comprises a pedestal and a bed frame, wherein a hinge lug connected with the lower parts of a front middle cross beam and a rear middle cross beam is hinged with two ends of an upper end shaft of an n-shaped support frame respectively and rotates around the two ends respectively; one end of a moment arm of the n-shaped support frame is hinged with four hinging bases positioned on a pedestal cross beam respectively and rotates around the hinging bases; the upper end shafts of the n-shaped support frame are provided with shaft connecting lugs at intervals; two ends of a synchronous support frame are connected with the shaft connecting lugs in the n-shaped support frame through a connecting shaft respectively; and the fixed end of a motor push rod retractable device is hinged with the hinging bases on the bed frame, while the retractable end is hinged with the hinging base on the cross beam at one end of the synchronous support frame. The liftable medical nursing bed has the advantages that a four-point hinge mechanism consists of the motor push rod retractable device, the n-shaped support frame and the synchronous support frame not only achieves the aim of using one motor push rod to control the rising and the falling of the whole bed frame, butalso has stable and reliable rising and falling speed.

The invention discloses a freely-located intelligent bridge bottom inspection maintenance vehicle which comprises guide rails, walking mechanisms, a rotary disc, a truss, telescopic arm structures andan electrical control system. The two guide rails are installed in parallel at the bottom of a bridge in the longitudinal bridge direction, the four walking mechanisms are symmetric in pairs and aresuspended on the two guide rails and arranged at the two ends of the rotary disc, the rotary disc is arranged among the four walking mechanisms and the truss, the truss is arranged at the bottom of the rotary disc and horizontally rotates at 90 degrees relative to the guide rails under rotation of the rotary disc, and the two telescopic arm structures are arranged at the two ends of the truss; andthe electrical control system is arranged on the middle portion of the truss and electrically connected with the walking mechanisms, the rotary disc and the telescopic arm structures and communicateswith the walking mechanisms, the rotary disc and the telescopic arm structures through hydraulic oil pipelines. The mode that the bridge bottom inspection maintenance vehicle is hydraulically drivento rotate to pass a pier is mainly adopted, detection maintenance of a multi-span continuous bridge is achieved, and the freely-located intelligent bridge bottom inspection maintenance vehicle has theadvantages of being good in adaptability, high in freedom degree, high in efficiency, good in economical efficiency and the like.

The invention relates to an aluminum product device for continuously casting blanks, in particular to an aluminum product device for continuously casting blanks. The device is characterized by comprising a crystallizing roller and a pressing roller which are mutually axially parallel, a pouring chute is arranged between the crystallizing roller and the pressing roller, a gear reducer is matched on the crystallizing roller, a steel reference plane is fixed on the lower portion of the gear reducer, an upper tensioning roller and a lower tensioning roller which are mutually axially parallel with the crystallizing roller and have a certain gap are fixed on one side of the crystallizing roller on the steel reference plane, a side lower tensioning roller which is distributed symmetrical to the lower tensioning roller is fixed relative to the crystallizing roller on the other side of the crystallizing roller, and steel strips are matched on the crystallizing roller, the pressing roller, the upper tensioning roller, the lower tensioning roller and the side lower tensioning roller. The device for aluminum products continuously casting blanks has the advantages of being reasonable and precise in structure design, safe and reliable.

The invention discloses a disposable metal rivet-free indwelling needle. The disposable metal rivet-free indwelling needle comprises a steel needle, a catheter block and an indwelling catheter, wherein the inside of the catheter block is provided with a through hole so that the steel needle can penetrate through; the inner wall of the indwelling catheter and the outer wall of the steel needle aretightly attached, and no metal rivet is arranged inside the catheter block. The disposable metal rivet-free indwelling needle saves metal rivets to avoid chemical reaction between metal and infused medicine liquor as well as toxic substance; meanwhile, the disposable metal rivet-free indwelling needle is also applicable to patients having CT (computed tomography), avoids indwelling needle withdrawing due to influence of metal on CT and accordingly to relieves pain for the patients; besides, the disposable metal rivet-free indwelling needle can also avoid the problem of heavy metal pollution and improve the infusion safety.

The present invention relates to a vacuum gripper device mainly applied to a vacuum transfer system. The device of the present invention comprises a vacuum pump directly embedded in a negative pressure chamber of a gripper main body, and the main body is designed with a configuration for support and operation of the vacuum pump, such as a first hole and a second hole connected to an inlet and an outlet of the vacuum pump. The vacuum pump is desirably supported by a fixing block provided inside the negative pressure chamber. The present invention does not create any vacuum leak during the operation of the vacuum pump, and achieves vacuum quickly. In addition, the present invention is compactly and safely designed while including the vacuum pump.

A multifunctional touch industrial tablet personal computer integrates an industrial control main board, a TFTLCD, a DC power supply, an internal memory, an electronic hard disk, a sudden stop control switch, a qualification control switch, a disqualification control switch, a touch screen controller, a touch screen, an induction control keyboard and an output amplification circuit. A CPU and all types of interfaces are integrated on the industrial control main board. An induction control keyboard array is controlled through a digital input port, and meanwhile a station induction sensing signal of a production line body can be received. A digital output port directly drives a station control relay of the production line body through the output amplification circuit. According to the multifunctional touch industrial tablet personal computer, an open type system is adopted, and the multifunctional touch industrial tablet personal computer can be suitable for being connected with an existing system of an enterprise in a butt joint mode due to the flexible assembly structure and standard external interfaces. Standardized products are adopted for all main parts, and therefore product quality is reliable, system updating can be conveniently conducted, and parts can be easily and conveniently maintained. Compared with like products, the multifunctional touch industrial tablet personal computer has stronger competitive force due to the reasonable cost performance and the safe structural design.

The invention discloses a process pipe with water cooled jackets at two ends. The process pipe with the water cooled jackets at the two ends comprises a process pipe main body, the water cooled jackets, a water inlet and outlet nozzle, a back furnace door, a front furnace door, a sheet boat, a silicon wafer and an equipment rack body; the process pipe main body is fixedly mounted on the inner wallof the equipment rack body through front and back fixed flanges; and the water cooled jackets are fixedly mounted at the positions, near the equipment rack body, of the two ends of the process main body through the front and back fixed flanges. Through temperature of heat radiation generated by furnace mouths at two ends on the sealing position, the influence on a furnace door sealing ring as well as heat generated on the process pipe main body by a heater, cooling water inside flows rapidly to take away heat, so that heat influence on the furnace door sealing ring and a process pipe sealingring by heat conducted by the process pipe main body is blocked well, the temperature of the furnace door sealing ring and the process pipe sealing ring is maintained low, the sealing effect is guaranteed, and the service life of the furnace door sealing ring and the process pipe sealing ring is obviously prolonged.

The invention discloses a main shaft assembly and a photovoltaic tracking support adopting the main shaft assembly. The photovoltaic tracking support is provided with a main shaft and a plurality of stand columns arranged at intervals, the main shaft is horizontally arranged at the upper ends of the stand columns, the main shaft is composed of a plurality of main shaft assemblies, and a main rotation assembly is fixed to the upper end of the middle stand column. Auxiliary rotation assemblies are fixed to the upper ends of the stand columns located on the side portions, the two sides of the main rotation assembly are fixedly connected with the two main shaft assemblies located in the middle correspondingly, the two sides of each auxiliary rotation assembly are fixedly connected with the two main shaft assemblies located on the side portions correspondingly, and the auxiliary rotation assemblies are symmetrically distributed on the two sides of the main rotation assembly; the main rotation assembly and the auxiliary rotation assembly are fixedly connected through a synchronous transmission rod. The main shaft of the photovoltaic tracking support is uniform in bearing strength distribution, safer and more reliable in structural design, light in overall weight and more convenient to produce and install.

The invention discloses a hydraulic low-frequency-absorption vibration isolator, and belongs to the field of mechanical vibration control. The hydraulic low-frequency-absorption vibration isolator comprises a hydraulic vibration isolator body and a hydraulic vibration absorber, wherein the hydraulic vibration isolator body comprises a corrugated pipe elastic oil tank and a top cover; the circumferential face of the corrugated pipe elastic oil tank is of a metal corrugated pipe structure, and an oil cavity is defined by the circumferential face of the corrugated pipe elastic oil tank and a baseof the corrugated pipe elastic oil tank; a hydraulic oil channel communicating the oil cavity with the outside is formed in the base; the top cover is in seal fit with the upper end of the corrugatedpipe elastic oil tank, the lower portion of the top cover is of a cylindrical boss structure, and a cylindrical boss is located in the oil cavity; a gap is reserved between the lower end face of thecylindrical boss and the upper end face of the base, and the gap is equal to the limiting distance of the hydraulic vibration isolator body; an exhaust channel communicating the outside with the oil cavity is formed in the top cover; the hydraulic vibration absorber comprises an external guide pipe and an external hydraulic oil cylinder; and the external hydraulic oil cylinder is connected with the hydraulic oil channel through the external guide pipe. According to the hydraulic low-frequency-absorption vibration isolator, dual vibration isolation of mechanical vibration broadband and line spectrum can be achieved, and meanwhile the use requirements for large bearing force and uniform bearing are met.