52results about How to "Achieve a soft landing" patented technology

The present invention relates to a control method of air conditioner safety shutdown. Said method includes the following steps: when the turn-off signal of indoor machine is received by outdoor machine, the compressor is in low-frequency operation, when it is used for refrigeration, the control system can forcedly close the electronic expansion valve of indoor machine, when it is used for heat production, the control system can forcedly close the electronic expansion valve of outdoor machine; then the cooling agent from electronic expansion valve to suction line of compressor can be discharged from exhaust hole by compressor; when the exhaust temperature of compressor is risen or low-pressure pressure is lowered to defined value, then control system can be used for controlling compressor and making it stop safety shutdown process of air conditioner. Said invention can utilize said control method to ensure normal operation of said system.

The invention discloses a carrier rocket sub-stage recycling system and method. The carrier rocket sub-stage recycling system comprises a recycling box body, a probe device, a signal transceiver, a plurality of airbags, an inflation device, moving mechanisms and a ground control system. The recycling box body is of a U-shaped box body structure with the top end being not closed; the probe device,the signal transceiver and the inflation device are arranged on the recycling box body; the multiple airbags are arranged at the bottom and on the side faces of the recycling box body correspondingly;the inflation device is connected with the multiple airbags; the moving mechanisms are arranged at the bottom of the recycling box body; and the ground control system makes remote communication withthe carrier rocket sub-stage recycling system through the signal transceiver. Based on a carrier rocket in active service, recycling of a sub-stage part is completed while the carrier rocket sub-stagepart is less changed.

The invention discloses an automatic receiving and transferring device for a pneumatic material conveying system. The automatic receiving and transferring device is connected to a pneumatic conveying pipeline unit used for conveying objects to be conveyed and comprises a cabinet body, and a receiving and transferring pipeline, a supporting and lifting platform unit and a manipulator unit are arranged inside the cabinet body; the upper end of the receiving and transferring pipeline is used for communicating with the pneumatic conveying pipeline unit; the supporting and lifting platform unit is matched with the receiving and transferring pipeline, does lifting motion below the receiving and transferring pipeline and is used for lifting the objects to be conveyed upwards, conveying the objects to be conveyed into the receiving and transferring pipeline for pneumatic conveyance and used for falling down after receiving the objects to be conveyed from the receiving and transferring pipeline; and the manipulator unit is arranged on one side of the lifting platform unit and is used for placing the objects to be conveyed from the exterior of the cabinet body on the lifting platform unit for lifting the objects and conveying the objects pneumatically and used for placing the objects to be conveyed on the lifting platform unit outside the cabinet body. The automatic receiving and transferring device has the advantages that the structure is simple and compact and the automation degree is high.

The invention provides a printed circuit board semi-finished product conveying and partition plate feeding integrated device. The printed circuit board semi-finished product conveying and partition plate feeding integrated device comprises a conveying roller set, a pair of adjustable guide assemblies, a pair of limiting supporting assemblies arranged in a spaced manner, a partition plate storage rack, a partition plate grabbing mechanism and a pair of partition plate bearing assemblies arranged in a spaced manner. Each limiting supporting assembly comprises a row of limiting supporting columns arranged in a spaced manner, wherein the limiting supporting columns are arranged in the gap between two adjacent roller bodies of the conveying roller set, the bottom ends of the row of limiting supporting columns are connected with the same connecting plate, the connecting plate is connected to the movable ends of a pair of first lifting air cylinders, the first lifting air cylinders are arranged on a base, and the base is arranged at the movable end of a first transverse linear mechanism. According to the printed circuit board semi-finished product conveying and partition plate feeding integrated device, conveying of printed circuit boards of different sizes is collimated and limited, the printed circuit boards can be normally overturned when conveyed to an overturning area, partition plate feeding is conducted on the printed circuit boards in the conveying process, partition plates are arranged between the overturned and stacked printed circuit boards, and protection on metal circuits on the two faces of a semi-finished product is formed.

The invention relates to an artificial knee joint prosthesis which comprises a patella prosthesis and a femur prosthesis, wherein the patella prosthesis is made of metal and is 3-4mm, preferably 3.5mm in thickness; the femur prosthesis is provided with a tackle part which is made of metal; a polyethylene joint surface is arranged on the surface of the tackle part; and the polyethylene joint surface is gradually thickened from a near end to a far end and no gap exists between the polyethylene joint surface and the tackle part. The artificial knee joint has the following advantages: the patella prosthesis is made of metal, so that the wear resisting property is good, the thickness is thin, the patella cut amount is decreased, then the application scope of the existing knee joint prosthesis is enlarged, the postoperative fracture occurrence rate is reduced, benefit is brought to overhauling and the problem of uneven patella stress distribution is solved at the same time; the tackle part of the femur prosthesis is covered by a layer of ultra-high molecular polyethylene joint surface, so that the abrasion is reduced and the 'soft landing' of femur quadriceps tendon is realized; and no gap exists between the polyethylene joint surface and the metal backing and the polyethylene joint surface and the metal backing are integrally pressed and shaped, so that a polyethylene / metal friction surface is not added.

The invention provides a two-grade buffering and stopping mechanism of a free piston. The free piston is composed of a rear end cover, a wearing-resisting ring, a piston body, a retainer ring, a sealing ring and a front end cover; acceleration-phase resistance reduction, decelerating-phase resistance increasing and sealing functions of the piston can be realized; the whole body of the piston is of a concave cavity structure; the two-grade buffering and stopping mechanism is composed of a buffering cushion, a supporting ring, a sleeve and a base and is of a convex through structure. In order to realize soft landing requirements of the piston, an annular pneumatic buffering cavity is formed by the sleeve, the base and an inner wall of a compression pipe; when the piston enters, primary buffering can be realized and most of kinetic energy of the piston is absorbed; the buffering cushion forms secondary buffering and the residual kinetic energy of the piston is absorbed through elastic deformation or plastic deformation of a material, so that the soft landing of the piston is realized. According to the two-grade buffering and stopping mechanism provided by the invention, the disadvantages of the type of equipment at present in the world that the elastic buffering cushion is easy to damage, the impact load in equipment is relatively great, the capability of absorbing the kinetic energy of the piston by the buffering piston is limited are overcome.

The invention discloses a high-efficiency road drilling vehicle, which comprises a vehicle body, wheels are arranged at the bottom of the vehicle body, and a cab is arranged on the vehicle body; at least one drilling mechanism is arranged at the front end of the vehicle body, and the drilling mechanism It includes a guide rail and a drill bit arranged on the guide rail, the guide rail is rotatably installed on the vehicle body, and the drill bit can move along the guide rail to the lower end of the guide rail to drill holes on the road surface. The high-efficiency road drilling vehicle improved by the invention can walk independently, has drivability, flexible and convenient movement, fast and convenient drilling, and high efficiency.

The invention relates to a variable cross-section heavy piston compressor. The variable cross-section heavy piston compressor comprises a high-pressure air chamber, a heavy piston, a compression pipe and a film clamping mechanism, wherein the high-pressure air chamber is used for driving the heavy piston; the compression pipe is composed of a thick compression pipe section and a thin compression pipe section at a diameter ratio of 2.0-3.5; the heavy piston is driven by the high-pressure air chamber to move inside the thick compression pipe section; the film clamping mechanism clamps a film inside the thin compression pipe section. The variable cross-section heavy piston compressor can effectively relieve shock wave attenuation caused by reflective rarefaction waves, greatly improve the stability of wave tunnel enthylpy value and nozzle chamber pressure and prolong effective wind tunnel testing time.

The invention relates to an air valve seating control device for a hydraulic drive air valve mechanism of an engine, which mainly comprises a hydraulic piston, a hydraulic oil channel, a one-way valve, a hydraulic piston cavity, a variable throttling channel and the like. The hydraulic piston cavity is provided with a main oil channel of the variable throttling channel and a bypass oil channel with the one-way valve and is communicated with a hydraulic system; and the hydraulic piston is used for driving an air valve to move. The air valve seating control device adopts the one-way valve to lead the hydraulic drive air valve mechanism to have different hydraulic circulation areas in the opening and closing process of the air valve; with the adoption of the variable throttling channel, the throttling circulation areas can be changed along with the air valve lift in the closing process of the air valve, and the air valve seating speed of the hydraulic drive air valve mechanism of the engine is furthermore controlled to realize the soft landing of the air valve.

The invention relates to a conveyor with adjustable height, which comprises a conveying rack erected upwards aslant, a support frame erected downwards aslant, a bearing frame, a conveying belt, a power roll, a driven roll and a supporting roll, wherein the bearing frame comprises a bottom cross rod, a supporting cross rod and uprights, the supporting cross rod and the uprights are rotatably connected, the uprights and the bottom cross rod are rotatably connected, supporting positions of the supporting cross rod of the bearing frame are provided with riding wheels; the conveyor further comprises an angular displacement driving device for driving the uprights to generate angular displacement by taking the bottom cross rod as an axis; by arranging the bearing frame, the riding wheels and the angular displacement driving device, the erecting height of the conveying rack is adjustable. The conveyor can be used for adjusting the height of the conveying rack, and has obvious characteristics.

The invention relates to a safety life-saving chamber capable of being used in usual time and emergency and automatically escaping, opening a parachute and landing softly. Inverted caret-shaped slopes formed by tops and bottoms of octagonal spherical chambers of the safety life-saving chamber and a fuselage form the fitting channel type relationship, thick flanges at the upper, the lower, the left and the right parts of a chamber body and two bracket-shaped channel type fasteners at the upper and the lower parts of the fuselage form the fitting relationship, the planar anti-rotation relationship is formed between the fronts and the backs of all the octagonal spherical chambers which are arranged along a longitudinal line, and a concave table folding side at the bottom of the chamber can be used for positioning for the lower part and loading for the above part. An upper lining plate, a lower lining plate, four hollow screw rods and screws for penetrating the chamber top and the chamber bottom and three butterfly-shaped shelves lead the chamber to constitute a life-saving device with good integrity and impact resistance. The parachute is fastened on an annular handle at the chamber top, foam plastic partition boards are arranged among the various chamber tops for preventing the parachutes at the various chamber tops from winding, and big and small conical springs are arranged at the chamber bottom, so that the safety life-saving chamber can not only prevent the imbalance of gravity generated during the up-and-down tilts and the left-and-right tilts during the flight of a plane, but also realize the automatic rapid escape, parachute opening and soft landing in emergency; furthermore, the safety life-saving chamber can separate the chamber and the parachute when falling into the sea and use a sealing cover with a vent pipe for inputting oxygen into the chamber.

The invention discloses a constant-pressure and constant-torque tool for fluid well drilling. The constant-pressure and constant-torque tool comprises an upper joint, an upper shell, a middle shell, a lower shell, a lower joint, a compensation joint, a mandrel, a limiting baffle ring, a piston, a nut, a first disc spring group, a second disc spring group and a third disc spring group, the mandrel is provided with an inner through hole, a mandrel bypass hole and a limiting step, the first disc spring group and the second disc spring group are mounted in the upper shell, the third disc spring group is mounted in the compensation joint, a multi-head thread groove and an oil injection hole are formed in the middle shell, a multi-head thread groove is formed in the outer portion of the lower joint, a combined sealing groove and an oil injection hole are formed in the lower shell, and a combined sealing groove is formed in the piston. The multi-head thread groove of the middle shell is engaged with the multi-head thread groove of the lower joint, so that compression torsion replacement is achieved, the energy storage function of the disc spring groups is combined, the purpose of constant pressure and constant torque is achieved, the tool is compact in structure and powerful in function, different drilling tools can be protected according to different mounting positions, and the purpose of stable drilling is achieved.

The invention discloses a safe landing airplane, which is characterized in that an airplane head separation part, an airplane tail separation part and an airplane seat separation part are arranged among an airplane head, a passenger cabin, an airplane tail and an airplane seat, so that the passenger cabin can be separated from other parts of the airplane in emergency; an engine and a grid wing are arranged on the peripheral side of the passenger cabin, the engine and the grid wing are controlled through a control system, the grid wing is responsible for buffering and decelerating, and the engine is responsible for steering of the passenger cabin, so that the posture of the airplane is adjusted, and the passenger cabin has a stable and appropriate landing posture and a slow descent balance speed. A passenger cabin parachute part is arranged at the tail of the passenger cabin so as to decelerate the passenger cabin in a landing state through a parachute; a landing buffer system comprising a buffer bracket and a buffer airbag is arranged at the head part of the passenger cabin so as to realize soft landing of the passenger cabin; safety landing of the passenger cabin is achieved by setting various safeguard measures, so that safety of passengers in the passenger cabin is guaranteed.

The invention relates to a power outage self-protection method of an industrial robot. The power outage self-protection method comprises the following steps that an inverter converts the electrical energy of a power storage device into the normal power supply after an external power source of a system is disconnected, and a motor drives a manipulator and a parking and storing mechanism to move until the tail end of the manipulator is moved to the parking and storing mechanism. The invention further relates to the industrial robot achieving the power outage self-protection method. The industrial robot includes a machine body and an electrical cabinet which are connected with a bracket; the machine body comprises the manipulator and the servo motor; the electrical cabinet comprises a servo motor driver and a controller; the servo motor is connected with the controller through the servo motor driver; the industrial robot further includes the parking and storing mechanism connected to thebracket, the power storage device and the inverter, wherein the power storage device and the inverter are arranged in the electrical cabinet; and the inverter converts the electrical energy of the power storage device into the normal power supply after the external power source of the system is disconnected, so that the tail end of the manipulator is moved to the parking and storing mechanism. Bymeans of the power outage self-protection method and the industrial robot, the cost is reduced, and the manipulator is prevented from hitting a platform in the event of power outage.

The invention relates to an engine characteristic processing method for vertical take-off and landing rocket on-line trajectory planning. The rocket engine characteristics measured offline are added to an online trajectory planning dynamics differential equation, the technical problem that an engine cannot respond to a control instruction given by a main control computer in time in the real flightprocess is solved, and finally the rocket completes a flight task according to a set planning trajectory. By directly limiting the instruction value of the engine, the range of the acceleration of the rocket in the vertical direction is restrained, and the stability of the rocket in the flying process is guaranteed. When flight is close to the end, the instruction value of the engine can be directly limited to be equal to g / k, it is guaranteed that the acceleration value generated by the real thrust of the rocket is equal to g, and soft landing is achieved.

The invention provides a spacecraft recycling linear electromagnetic damping device, relates to the field of spacecraft recycling, and aims at solving disadvantages of parachute landing systems that are conventionally used as spacecraft recycling devices, like large diameter and large weight of the parachute surface, and occupying spacecraft load resources. When preparing recycling, a plurality ofevenly arranged support frames support recycling nets, and net corners of the recycling nets are respectively connected with linear electromagnetic damper movers of the support frames. When the spacecraft falls into the recycling nets, the linear electromagnetic damper movers are pulled downward; meanwhile, permanent magnets on stators cut third conductor plates on the movers to generate magneticfields; and braking forces are generated to buffer the descent process of the spacecraft falling into the recycling nets and control the falling speed of the spacecraft. After the recycling process is completed, the movers and the recycling nets are lifted by drive coils integrated in the linear electromagnetic dampers to prepare for a next spacecraft recycling. The device is used for recycling aspacecraft.

The invention provides a device for ensuring soft landing and overload alarm of hooks. The device comprises two sets of eudipleural units, wherein the two sets of symmetric units are connected by an upper guide sleeve (104) and a lower guide sleeve (104) and are respectively fixed on a travelling vehicle by an upper fixed plate (105) and a lower fixed plate (105); the unit comprises an expansion link (101), two anti-drop guide rods (102), an elastic part (103), a flange (110), an adjustable screw (111) and a circuit control subunit; a circular hole is formed at one end of the expansion link (101) for a steel wire rope (109) to pass, and the adjustable screw (111) is connected with the other end of the expansion link (101); the flange (110) sleeves the expansion link (101), the elastic part (103) is located between the guide sleeve (104) and the flange (110), the two anti-drop guide rods (102) respectively pass through two ends of the two guide sleeves (104) and the flange (110), and the circuit control subunit is arranged on the guide sleeve (104) so as to be used for controlling a hook motor.

The invention provides an impact resisting check valve. The impact resisting check valve is composed of a valve body, a valve seat, a valve clack, an elastic piece and a valve cover. The valve clack is arranged on the valve seat in a vertical moving mode. The elastic piece is arranged on the valve clack in a sleeving mode to make the valve clack have the tendency of being closed to the valve seat. A guide sleeve and a fixing plug are fixedly arranged above a middle cavity of the valve body. The fixing plug is located in the middle of the guide sleeve and extends downwards. The upper portion of the valve clack is arranged in the guide sleeve in a vertical sliding fit mode. A receding space is arranged above the valve clack and located on the guide sleeve. A piston hole for the fixing plug to be inserted therein is formed in the valve clack. A through hole communicated with the middle cavity is formed in the bottom of the side wall of the piston hole. A buffering structure hole communicated with the piston hole and the middle cavity is formed above the through hole. The buffering structure hole vertically extends in the length direction of the buffering structure hole. The buffering structure hole is provided with an upper section and a lower section which are communicated. The moving speed of the valve clack is controlled through the relative position relation of the fixing plug and the buffering structure hole. Impact force produced between the valve clack and the valve seat when the valve clack is closed is prevented, and therefore the service life of the valve is prolonged.

The invention relates to a vehicle body correcting machine and a control system mounted on a base of the correcting machine, the vehicle body correcting machine comprises a lifting mechanism and a drawing tower, and a front position-limiting pile and a rear position-limiting pile are respectively fixedly mounted on the base of the lifting mechanism. The vehicle body correcting machine further comprises a locking arm for locking the drawing tower on the lifting mechanism, the locking arm is connected with an upper frame which is fixedly mounted on a tower column through a second articulated shaft at the middle part of the locking arm, and the front end of the locking arm is connected with a floating locking head through a first articulated shaft. The upper end of a locking oil cylinder is connected with the rear end of the locking arm through a third articulated shaft. A locking mechanism comprises two rolling wheels for matching with a platform track, the rolling wheels are connected with a revolution shaft through rotation shafts, the revolution shaft is mounted on a cross arm of the drawing tower and a directional wheel is further mounted on the revolution shaft. The control system is mounted on the correcting machine, the vehicle body correcting machine integrates parallel lifting and oblique lifting of a platform, locking of the drawing tower and the functions of the drawing tower into a whole and is controlled by virtue of remote control keys, and thus the automatic and continuous correction operation is further realized.

The invention discloses a pose detection device of a cargo boom of a mining excavator and a control method. The detection device comprises a steel wire rope, a guide wheel, a balancing weight and a pull switch. One end of the steel wire rope is connected to the upper side wall of the cargo boom, and the other end of the steel wire rope crosses over the guide wheel and is connected with the upper end of the balancing weight. A 90-degree included angle is formed by the two segments, crossing over the guide wheel, of the steel wire rope. The guide wheel is fixedly mounted on the excavator. The lower end of the balancing weight is connected with the pull switch, and the balancing weight can move in the vertical direction. The pull switch is fixedly mounted on the excavator and is connected with the lower end of the excavator, and the pull switch is used for measuring the movement distance, in the vertical direction, of the excavator. According to the pose detection device of the cargo boomof the mining excavator and the control method, soft landing can be achieved after the cargo boom is jacked up, the number of times and amplitude that the cargo boom is jacked up can be effectively reduced, and the cargo boom, guy ropes and other mechanical structures can be prevented from being damaged.

The invention relates to the technical field of hydraulic oil cylinders, in particular to a hydraulic oil cylinder of a thrust floating buffer industrial furnace. The hydraulic oil cylinder comprises a cylinder body vertically mounted, wherein the bottom end of the cylinder body is a cylinder bottom; a piston is arranged in the cylinder body, and is fixedly connected with a piston rod; the piston rod is coated with a cylinder cover; the cylinder cover is fixedly mounted at the upper end of the cylinder body; the inner diameter of the piston rod is smaller than the inner diameter of the cylinder body; the piston divides the cylinder body into a rod cavity and a rodless cavity; a floating buffer piston component for limiting the piston to upwards move is arranged in the rod cavity, and coats the piston rod; and an outer ring of the floating buffer piston component is tightly connected with the inner wall of the cylinder body. As the hydraulic oil cylinder of the thrust floating buffer industrial furnace is additionally provided with one set of floating buffer piston component in the rod cavity, when the descending of the oil cylinder is suddenly stopped, the pressure ascending speed of the rodless cavity is slowed down, and soft landing of a furnace body and molten steel is realized.

The invention relates to the technical field of an unmanned aerial vehicle and discloses a crash-preventing unmanned aerial vehicle. The crash-preventing unmanned aerial vehicle comprises a machine body, a safe airbag system and a processor, wherein the safe airbag system comprises a collision sensor, a plurality of safe airbags and an air charging device; the processor is connected with the collision sensor and the air charging device; and the processor is used for receiving a collision signal transmitted by the collision sensor and controlling the air charging device to perform air inflationon a plurality of safe airbags. The crash-preventing unmanned aerial vehicle provided by the execution mode of the invention is provided with the safe airbag system and the processor, the collision sensor of the safe airbag system transmits the collision signal to the processor when foreign body collision occurs, and the processor receives the collision signal and controls the air charging deviceto perform air inflation on a plurality of safe airbags according to the collision signal, so that a plurality of safe airbags are opened, the crash-preventing unmanned aerial vehicle can realize soft landing and comminuted crash is avoided.

The invention relates to a mars soft landing guidance method, in particular to a mars probe landing guidance method based on fuel minimization, and belongs to the technical field of deep space exploration. The mars probe landing guidance method based on fuel minimization solves the problems that fuel minimization guidance can not be achieved through an existing explicit guidance law, and the optimal guidance law must store an entire track, so that a large storage space is occupied. The technical scheme includes the steps that a fuel optimal solution of a probe is acquired; path points are set and a path point library is established; a linear feedback guidance law is designed, if initial state information of the probe is matched with path point information of the path point library, landing is executed, and otherwise, landing is executed after the path points are fitted. Through the guidance strategy of the path points and the linear guidance law, the method can achieve the fuel optimal guidance of a power descent section of the mars probe based on a small storage space. The mars probe landing guidance method based on fuel minimization is suitable for the guidance law of the power descent section of the mars probe.

The invention provides an impact resisting check valve. The impact resisting check valve is composed of a valve body, a valve seat, a valve clack, an elastic piece and a valve cover. The valve clack is arranged on the valve seat in a vertical moving mode. The elastic piece is arranged on the valve clack in a sleeving mode to make the valve clack have the tendency of being closed to the valve seat. A guide sleeve and a fixing plug are fixedly arranged above a middle cavity of the valve body. The fixing plug is located in the middle of the guide sleeve and extends downwards. The upper portion of the valve clack is arranged in the guide sleeve in a vertical sliding fit mode. A receding space is arranged above the valve clack and located on the guide sleeve. A piston hole for the fixing plug to be inserted therein is formed in the valve clack. A through hole communicated with the middle cavity is formed in the bottom of the side wall of the piston hole. A buffering structure hole communicated with the piston hole and the middle cavity is formed above the through hole. The buffering structure hole vertically extends in the length direction of the buffering structure hole. The buffering structure hole is provided with an upper section and a lower section which are communicated. The moving speed of the valve clack is controlled through the relative position relation of the fixing plug and the buffering structure hole. Impact force produced between the valve clack and the valve seat when the valve clack is closed is prevented, and therefore the service life of the valve is prolonged.

The invention discloses an automatic receiving and transferring device for a pneumatic material conveying system. The automatic receiving and transferring device is connected to a pneumatic conveying pipeline unit used for conveying objects to be conveyed and comprises a cabinet body, and a receiving and transferring pipeline, a supporting and lifting platform unit and a manipulator unit are arranged inside the cabinet body; the upper end of the receiving and transferring pipeline is used for communicating with the pneumatic conveying pipeline unit; the supporting and lifting platform unit is matched with the receiving and transferring pipeline, does lifting motion below the receiving and transferring pipeline and is used for lifting the objects to be conveyed upwards, conveying the objects to be conveyed into the receiving and transferring pipeline for pneumatic conveyance and used for falling down after receiving the objects to be conveyed from the receiving and transferring pipeline; and the manipulator unit is arranged on one side of the lifting platform unit and is used for placing the objects to be conveyed from the exterior of the cabinet body on the lifting platform unit for lifting the objects and conveying the objects pneumatically and used for placing the objects to be conveyed on the lifting platform unit outside the cabinet body. The automatic receiving and transferring device has the advantages that the structure is simple and compact and the automation degree is high.

The invention discloses a buffering device used for a pneumatic material conveying system. The buffering device is arranged at one end of a pneumatic conveying pipeline, and comprises a buffering gas providing assembly and an air supply pipeline; the buffering gas providing assembly communicates with the pneumatic conveying pipeline through the air supply pipeline; and when conveyed objects are conveyed from the pneumatic conveying pipeline, the buffering gas providing assembly blows air into the pneumatic conveying pipeline through the air supply pipeline so that air pressure can be formed at one end of the pneumatic conveying pipeline and used for buffering the conveyed objects. The buffering device used for the pneumatic material conveying system has the advantages of being simple and compact in structure and good in buffering effect.

The invention provides a sandy soil curing agent used for water conservancy project soft sinking mattress bottom protection, shore protection, and beach protection, and a construction method thereof. Production technology of the sandy soil curing agent is simple, and operation is convenient. The sandy soil curing agent comprises 8 to 16wt% of fly ash, 1 to 5wt% of an additive, 1 to 5wt% of gypsum, 1 to 5wt% of sodium sulfate, 0.5 to 3wt% of industrial salt, 0.5 to 3wt% of polycarboxylic acid water reducing agent (or a powder agent), 0.2 to 1wt% of rapid hardening agent A, 0.1 to 0.6wt% of methyl cellulose ether A, 0.1 to 0.6wt% of ethyl cellulose ether B, 0.1 to 0.6wt% of cellulose ether C, and the balance cement. The sandy soil curing agent is capable of maintaining conventional sand rib technical advantages, and functional requirements as an inverted filter, and achieving complementary advantages and realizing perfect combination of hard filling materials with soft geotextile preferably without increasing engineering cost, and realizing soft landing and hard protecting of mattress body authentically and skillfully.

An integrated device for conveying printed circuit board semi-finished products and bulkhead feeding includes a set of conveying rollers, a pair of adjustable guide assemblies, a pair of spaced limit support assemblies, a bulkhead storage rack, a bulkhead grabbing mechanism, a Partition boards set at intervals receive components. The limit support assembly includes a row of limit support columns arranged at intervals. Each limit support column is respectively arranged in the gap between two adjacent roller bodies of the conveying roller group. The bottom ends of a row of limit support columns are all connected to the same connection. The connecting plate is connected to a pair of movable ends of the first lifting cylinder, the first lifting cylinder is arranged on a base, and the base is arranged on the moving end of the first transverse linear mechanism. Realize the alignment and limit of the conveyance of printed circuit boards of different sizes, ensure that the printed circuit boards can be turned over normally when they are conveyed to the turning area, and the printed circuit boards are fed on the partition during the conveyance, so that after turning over There are partitions between the stacked printed circuit boards to protect the metal circuits on both sides of the semi-finished product.