658 results about "Double acting" patented technology

The invention relates to a rack rail trapped rail vehicle, a driving unit and a swing frame assembly, and belongs to the technical field of rack rail trapped rail vehicles. The swing frame assembly runs on the rack rail and comprises a fixed seat and a swing frame pivoted with the fixed seat through a hinge shaft; two rollers in rolling contact with the top surface of the special-shaped rail on the corresponding side are arranged on one side of the swing frame at intervals, and two brake assemblies are arranged on the other side of the swing frame at intervals; each brake assembly comprises a first brake block, a second brake block and a double-acting oil cylinder, the double-acting oil cylinders drive the two brake blocks to be far away from or close to each other to achieve separation or abutting connection with the peripheral faces of the corresponding idler wheels and the lower surface of the special-shaped rail top plate, and braking and braking releasing are completed. The driving unit comprises a mounting frame and the swing frame assemblies arranged on the two sides of the bottom of the mounting frame. The rack rail clamping vehicle comprises a driving assembly, and the driving unit is installed on a driving frame of the driving assembly. According to the scheme, the swing frame swings in a self-adaptive mode to adapt to track fluctuation, a double-brake structure of the double brake blocks is combined, and the running stability and safety of the rack rail trapped rail vehicle are effectively improved.

The invention discloses a core shooter with a quick mold changing structure and a matched core box, and relates to the technical field of mold manufacturing. A core shooter movable plate is provided with a seam allowance groove and an electromagnetic coil, a core box upper mold is provided with a seam allowance boss with a permanent magnet, and three-stage magnetic coupling control is achieved through a control system, specifically, during mold closing, homopolar repulsive force guiding is conducted to avoid collision, during positioning, heteropolar attraction force locking is conducted, and during mold changing, homopolar repulsive force pushing separation is conducted. And three-dimensional accurate positioning and mechanical redundancy locking are formed by a clamping jaw clamping mechanism driven by a double-acting oil cylinder under the assistance of taper fit of right-angle limiting grooves in the four corners of the supporting plate and positioning blocks of the fixing plate. Through magnetic coupling automatic guiding and mechanical cooperative clamping, the mold changing time is shortened to be within 2 minutes from 30-40 minutes, single-person operation is achieved, the positioning precision and the vibration resistance are improved, the labor intensity is remarkably reduced, and the mold changing device is suitable for efficient and continuous production in the casting industry.

Damping arrangement for an axle of an active chassis of a motor vehicle. A damping system interacts with each wheel of the axle. Each of the damping systems includes the following assemblies: a damper including a double-acting hydraulic cylinder and a piston, a hydraulic pump and an electric motor for driving same, and a hydraulic unit which includes a hydraulic reservoir and valves. The hydraulic pump and the hydraulic unit of the respective damping system interact with hydraulic chambers of the hydraulic cylinder in such a manner that a movement of the piston in a first or in a second operating direction can be provided depending on the delivery direction of the hydraulic pump. The electric motors of both damping systems are connected to a common control device and can be actuated thereby, wherein the common control device has electronic assemblies which are distributed on different printed circuit boards.

The invention discloses a reverse transmission locking and overload protection double-acting mechanism and an electric cylinder. The double-acting mechanism comprises a first shaft sleeve, a second shaft sleeve and a third shaft sleeve, the transmission wheel is movably arranged on the first shaft sleeve in a sleeving manner; the groove plates are oppositely and fixedly mounted on the transmission wheel in the circumferential direction and are provided with grooves for placing the balls; the retainer is mounted on the first shaft sleeve in a torque transmission connection manner and is provided with a first mounting hole for accommodating the ball; the convex sleeve is installed on the first shaft sleeve in a torque transmission connection mode, the first end of the convex sleeve is in direct or indirect contact connection with the balls, and a convex structure is arranged at the second end of the convex sleeve; the taper sleeve is connected to the lead screw shaft through a key, the small end of the taper sleeve is provided with a groove structure matched with the protruding structure, and the taper sleeve is provided with an outer conical surface; the sleeve is relatively and fixedly connected with the shell of the electric cylinder and is provided with an inner conical surface matched with the outer conical surface of the conical sleeve; one end of the compression elastic piece is pressed on the limiting end face fixed relative to the lead screw shaft, and the other end of the compression elastic piece abuts against the large-head end face of the taper sleeve.

The invention discloses a self-adaptive clamp adjusting method based on intelligent vision and pneumatic control. The self-adaptive clamp adjusting method is suitable for a multi-variety small-batch flexible manufacturing scene. According to the method, a closed-loop control framework composed of multi-mode sensing, hybrid modeling, dynamic optimization and pneumatic execution is constructed, and precise sensing and rapid compensation of part deformation under the complex working condition are achieved. Submillimeter deformation data is obtained in real time by fusing binocular vision, optical fiber strain and a laser displacement sensor; dynamically outputting a clamp compensation instruction in combination with the finite element stiffness matrix and an XGBoost prediction model; a PSO-Adapt ivePena lty algorithm is introduced to carry out multi-objective optimization, so that the response speed and the cooperation efficiency of the system are improved; and the pneumatic actuating mechanism adopts a double-acting cylinder and a cam-groove mechanism, so that high-precision adjustment is realized. The method has the advantages of high precision, fast response and strong multi-clamp collaboration, and is suitable for the intelligent manufacturing fields of automobiles, aerospace and the like.

The invention discloses an intelligent clamping shackle device for an underground drill rig and a control method. The intelligent clamping shackle device comprises a clamping device, a shackle device body, a connecting base and a forcing device. The clamp holder and the shackle device are fixed on the connecting base; the forcing device is a double-rod double-acting forcing oil cylinder with a central through hole and is concentrically mounted in front of the shackle device; by detecting the spatial position of the slip, the drill rod is adjusted, and righting of the upper buckle of the drill rod is completed; and through the forcing device, the torque required by shackle is effectively reduced. According to the invention, the automatic control of the clamping and shackling processes of the clamping device can be realized, the shackling brake torque can be reduced, the stress condition of the clamping shackling device can be improved, the lightweight of the clamping shackling device is facilitated, and the early warning of the service life of the slip can be carried out in real time.

The invention relates to a telescopic storage rack, belongs to the technical field of hydraulic driving devices and multi-layer storage rack structures, and mainly solves the problems that an existing storage rack is poor in interlayer synchronism, strenuous in operation and insufficient in long-term stability. The device comprises at least two storage layers, each storage layer is formed by connecting a first frame body and a second frame body in a crossed and sliding mode, and connecting rods of the first frame body and the second frame body penetrate through sliding holes of U-shaped pieces of the opposite side to form a telescopic structure. The hydraulic synchronous driving mechanism comprises a double-acting hydraulic cylinder, a manual hydraulic pump, a two-way control valve and a hydraulic locking valve, the hydraulic cylinder is transversely fixed to the inner side of the first frame body end part, a piston rod is hinged to the second frame body end part, and an oil way is connected to a rodless cavity and a rod cavity of the hydraulic cylinder through a high-pressure hose; the two-way control valve switches the oil flow direction to achieve synchronous stretching and retracting, and the hydraulic locking valve closes an oil way. The device is compact in structure, stable in operation and suitable for high-precision synchronous adjustment scenes such as medical equipment and laboratory operating tables.

The invention discloses a suspended small cased well eccentric integrated double-pipe separated injection pipe column and a separated layer water injection method thereof, and aims to improve the later testing and adjusting success rate of small-diameter separated injection construction and prolong the separated injection validity period. The separate injection pipe column comprises an outer layer pipe and an inner layer pipe. The outer layer pipe comprises a conventional oil pipe, a double-flow-channel eccentric water distributor, an outer connecting sleeve, an adapter connector, a small-diameter oil pipe, a small-diameter packer, a double-acting injection valve, a small-diameter check valve, a screen pipe and a screwed plug which are sequentially connected from top to bottom. The inner-layer pipe comprises a first oil pipe connected to the lower inner end of the double-flow-channel eccentric water distributor and a rear-throwing ball type check valve. The layered water injection method comprises the steps of tripping in a tubular column, pressing and setting, measuring a water absorption index, putting a valve ball to control a water injection channel, and flushing a well. The method can achieve accurate layered water injection, improve the water injection efficiency and prolong the validity period of layered water injection, and is suitable for layered water injection operation of small cased wells.

The present invention provides an ultra-high precision pneumatic force servo system and an intelligent control parameter optimization method therefor. The pneumatic force servo system is mainly composed of a double-acting air-floating frictionless cylinder and a pressure control system; the effect of friction on the control accuracy can be removed by using the air-floating frictionless cylinder; the pressure control system achieves ultra-high precision control of pressure by means of a fuzzy PI controller optimized on the basis of a novel improved particle swarm algorithm; a Gaussian variation strategy and a fuzzy control theory are integrated in the novel improved particle swarm algorithm; optimized fuzzy PI control parameters are obtained using the novel improved particle swarm algorithm and ultra-high precision pressure control of a chamber of the air-floating frictionless cylinder is performed on the basis of the parameters, such that ultra-high precision force output of the system can be achieved; the pneumatic servo system provided by the present invention can be applied to occasions where high control accuracy of force is required, expanding the application range of the pneumatic servo system.

The invention discloses a kinetic energy output method and device based on hydraulic pressure, and the core of the technical scheme is an equal-volume differential composite cavity hydraulic driving module which comprises a double-acting double-rod hydraulic cylinder, a double-rod hydraulic cylinder and a single-rod hydraulic cylinder, piston rods at the left end and the right end of the double-acting double-rod hydraulic cylinder are fixedly connected with piston rods of the other two hydraulic cylinders respectively, the fixed connection positions are always located in the auxiliary cylinder barrel in the back-and-forth stroke, a gap is formed between the large piston rod and the inner wall of the auxiliary cylinder barrel, and near-end hydraulic cylinder cavities on the left side and the right side of the main cylinder form two equal-volume differential motion composite cavities. When the piston rod moves left and right, the volumes of near-end cavities of the two hydraulic cylinders are equal in increment and decrement, and the total volume of the composite cavity is not changed; the differences between the cross sectional areas of the pistons and the piston rods of the three hydraulic cylinders are equal; the difference between the cross sectional areas of the large and small piston rods is equal to the net area of differential driving force of the composite cavity; hydraulic pressure is circularly switched through the two-position four-way reversing valve, and kinetic energy of the piston rod is differentially driven by the composite cavity to be circularly output.

The invention belongs to the field of electro-hydraulic actuators, and particularly relates to a double-cylinder double-acting rotary electro-hydraulic actuator which comprises a box body, a sealing cover provided with a shaft hole is installed at the front end of the box body, a bearing installed in an inner cavity of the box body is arranged behind the sealing cover, and a gear shaft penetrates through the middle of the bearing. The gear shaft is sleeved with a gear. When the gear shaft is driven, the upper oil cylinder and the lower oil cylinder move oppositely, the pistons on the upper portion and the lower portion drive the racks to be meshed with the gears through jacking, stretching and resetting, and the four cylinders are crossed and symmetrical, so that the gear shaft is evenly pushed by the two oil cylinders all the time in the rotating process, operation is very stable, torque output of the gear shaft is increased in a limited space, and the service life of the gear shaft is prolonged. And the double-acting design enables the opening and closing actions to be actively driven by hydraulic pressure, the control response is fast, the position is accurate, and the hydraulic valve is suitable for opening and closing of large-torque valves of ships, chemical engineering and the like.

The invention discloses an aerodynamic force control actuator, a robot with the aerodynamic force control actuator and a polishing method. The aerodynamic force control actuator comprises a mounting plate, a double-acting air cylinder, an electric proportional valve set, a controller, a shaft, a floating connector, a three-axis force sensor and a pneumatic polishing head, the double-acting cylinder is mounted on the mounting plate, and piston rods are distributed downwards; two electric proportional valves of the electric proportional valve group are respectively connected and communicated with a rodless cavity and a rod cavity of the double-acting cylinder; the top end of the shaft is connected with a piston rod through a floating joint; the bottom end of the shaft is connected with a triaxial force sensor; the pneumatic polishing head is connected with the three-axis force sensor through a coupler. The three-axis force sensor is electrically connected with the controller, and the controller is electrically connected with the electric proportional valve set. The double-acting air cylinder and the two electric proportional valves are adopted, small contact force can be accurately controlled and rapidly adjusted, the requirement for force / heat sensitive characteristics of organic glass and other materials is met, and surface burning is avoided.

A downhole pumping system for subsea use is provided. The pumping system is designed such that all fluid conduits and electrical signal conduits are internalized within the pumping assembly. This design provides a substantially constant and elongated profile for the pumping assembly. The pumping assembly includes a housing containing the power assembly, a power actuator assembly operably linked to the production fluid assembly, and a central bore extending through the pumping assembly to provide fluid communication between the power assembly and a first end of the pumping assembly. The pumping system also includes a flow distributor / connector at the first end or the pump head for providing fluid communication between the pump head and a delivery system extending from the surface to the pumping system. The communicating fluids include a high pressure power hydraulic fluid, a low pressure discharge hydraulic fluid, and a pressurized production wellbore fluid.

The utility model discloses a two-stage stroke single-action oil cylinder with two oil inlets, relates to the technical field of computer wire arrangement, and provides the following scheme that the two-stage stroke single-action oil cylinder comprises a straight-through type forced filling oil cup, a cylinder body is installed below the straight-through type forced filling oil cup, and a first oil inlet is formed in the right side of the top of the cylinder body. A user introduces oil into the cylinder body through the second oil inlet, the oil enters the cylinder body to push the piston body upwards, and due to blocking of the double-acting sealing piece, the oil cannot enter the left side of the piston body, at the moment, the piston body and the piston rod installed in the piston body move upwards synchronously till the end of the piston body makes contact with the end face of the cylinder cover for limiting; the operation distance of the oil cylinder is the first stroke, when the first oil inlet is communicated with oil inwards, the oil can enter the piston inner cavity through a hole formed in the left side of the piston body, and at the moment, the piston rod continues to ascend till the shaft steel wire check ring installed on the piston rod makes contact with the end face of the cylinder cover for limiting.

The utility model provides a belt conveyor with an adjustable conveying angle, which comprises a power output part, a swing part, a connecting part, a double-acting air cylinder, a belt and a PLC (programmable logic controller) control system, the connecting part comprises a first connecting piece, a second connecting piece, a connecting roller and a first bearing seat, the first connecting piece is connected with the power output part, the second connecting piece is connected with the swing part, and the second connecting piece is connected with the double-acting air cylinder. The connecting roller is sleeved with the first connecting piece and the second connecting piece, the two ends of the connecting roller are rotationally sleeved with the first bearing pedestals which are fixedly connected with the first connecting piece, the two ends of the double-acting air cylinder are connected with the swing part and the power output part respectively, the PLC control system is electrically connected with the double-acting air cylinder, and the belt is wound around the power output part and the swing part. The technical problems that in the prior art, due to the fact that a belt conveyor can only convey objects to a secondary conveying line located at the same horizontal height, an object conveying system cannot fully utilize the longitudinal space, the occupied area is large, the conveying efficiency is reduced, and the operation cost of an enterprise is increased are solved.

The invention belongs to the technical field of fluid transmission and control, and particularly relates to a high-frequency switch valve control multi-cylinder synchronous jacking control system and method. The control system comprises jacking equipment, N sets of hydraulic cylinders arranged below the jacking equipment and a hydraulic system used for controlling the N sets of hydraulic cylinders to stretch out and draw back. The hydraulic system comprises an oil tank, a filter, a hydraulic pump, a motor, an overflow valve, a first one-way valve, an energy accumulator, N high-frequency switch digital valve sets and N double-acting hydraulic control one-way valves, wherein the N high-frequency switch digital valve sets and the N double-acting hydraulic control one-way valves are in one-to-one correspondence with the N hydraulic cylinders. Any hydraulic cylinder passes through a hydraulic cylinder control loop composed of a high-frequency switch digital valve set and a double-acting hydraulic control one-way valve, the N sets of hydraulic cylinders adopt the same oil tank, main oil inlet path and main oil return path, it is guaranteed that the hydraulic cylinder control loop has high switching frequency, the displacement control precision is improved, and the working efficiency is improved. The problems that in the prior art, a multi-cylinder synchronous jacking control system is poor in synchronization precision, poor in system stability and low in response speed are solved.

The embodiment of the invention provides a supercharging device and a hydraulic system for a fully mechanized coal mining face, the supercharging device comprises a pressure reducing valve, a double-acting reciprocating supercharger, an energy accumulator and a safety valve, the double-acting reciprocating supercharger is provided with a device liquid inlet, a device liquid return port and a device liquid outlet, the reciprocating pressure cylinder comprises a reciprocating pressure cylinder body, a hydraulic control reversing valve used for pressurizing and a hydraulic control one-way valve used for releasing pressure, a movable piston is arranged in the reciprocating pressure cylinder body, and pressurizing or releasing pressure is achieved through movement of the piston in the reciprocating pressure cylinder body. According to the embodiment of the invention, each hydraulic support on the fully mechanized coal mining face is supplemented with pressure at the position close to the working face through the supercharging device, a high-pressure booster pump does not need to be provided, so that a hydraulic system is simple, high in reliability and low in cost, and the hydraulic support can be continuously supplemented with pressure.

Damping arrangement of an active chassis for an axle of a vehicle. A damping system cooperates with each wheel. Each of the damping systems has a damper having a double-acting hydraulic cylinder and a piston, a reversible hydraulic pump and an electric motor, and a hydraulic unit having a hydraulic reservoir and valves. The hydraulic pump and the hydraulic unit of the respective damping system cooperate with the hydraulic cylinder thereof such that, dependent upon the conveying direction of the hydraulic pump, a movement of the piston in a first actuation direction or in a second actuation direction can be provided. The electric motors of both damping systems are connected to and drivable by a common control device. A position sensor is associated with each electric motor to acquire the rotor position of the respective electric motor. A pressure sensor is associated with each hydraulic pump to acquire a pressure.

The utility model discloses a deflection welding tool for an inner portal of a through-type forklift. An inner portal conveying mechanism is an unpowered roller line, and a fixed guide wheel is arranged on one side of the inner portal conveying mechanism; the rotating mechanism is of a head-tail supporting two-section type and drives the inner portal frame conveying mechanism to rotate forwards and backwards by 360 degrees. The inner portal positioning and clamping mechanisms are installed on a frame of the inner portal conveying mechanism, the multiple inner portal positioning and clamping mechanisms are arranged in the inner portal conveying direction, and each inner portal positioning and clamping mechanism is provided with a movable guide wheel, a double-acting clamping device and a rotary clamping air cylinder. The guiding function in the conveying process of the inner gantries of different sizes and the clamping function in the overturning and welding process are achieved. The inner portal frame clamping device achieves automatic clamping of the inner portal frame with the height and the width within a certain range, is in butt joint with an automatic production line and is high in universality. The side direction of the door frame does not bear external force, certain welding deformation can be limited, and the welding quality is improved. Welding operation of the inner portal in different position angle states is achieved, production efficiency is improved, and labor intensity is reduced.

The invention discloses a double-acting piezoelectric air pump which comprises a pump body with a cavity, a first diaphragm valve plate, a vibrator and a second diaphragm valve plate, wherein the first diaphragm valve plate, the vibrator and the second diaphragm valve plate are transversely arranged in the cavity. A first air inlet is formed in the first diaphragm valve plate, a second air inlet is formed in the second diaphragm valve plate, a discharge channel, a first air inlet channel, a second air inlet channel, a first air outlet channel, a second air outlet channel, a first convex column and a second convex column are arranged on the pump body, and the discharge channel communicates with the first air outlet channel and the second air outlet channel; in the process that the vibrator deforms and displaces in the direction close to the first convex column, the first convex column is in clearance fit with the first air inlet, and the second convex column is separated from the clearance fit with the second air inlet; in the process that the vibrator deforms and displaces in the direction close to the second convex column, the first convex column is separated from the clearance fit with the first air inlet, and the second convex column is in clearance fit with the second air inlet; the air pumping efficiency and the exhaust flow are greatly improved.

The utility model discloses a six-claw turntable clamping device driven by a single cylinder. The six-claw turntable clamping device can be used as an independent component to be mounted on automatic equipment in the field of mechanical equipment. The device is composed of a double-acting air cylinder, a rotating arm and a chuck, the double-acting air cylinder provides driving force for clamping and loosening of the chuck, and an air cylinder driving piston and a rotating disc in the chuck are connected through the rotating arm. The air cylinder drives the rotating arm, the rotating arm drives the rotating disc assembly to rotate by a certain angle in the shell, the small sliding shaft in the rotating groove drives the clamping block shaft and the clamping block to stretch out and draw back together, and therefore the pipe clamping effect is achieved. According to the single-air-cylinder driving and rotating disc mechanism, the defect of asynchronism caused by the fact that a common chuck adopts multiple air cylinders to drive clamping blocks is overcome, clamping synchronism and uniformity of clamping force are greatly improved, and therefore the problem of relative sliding between the chuck and a pipe is avoided, precision of fixed-length cutting of products is improved, and production efficiency is improved. And meanwhile, a single cylinder is adopted to replace multiple cylinders, so that the manufacturing cost of the clamping device is greatly reduced.

An integrated shearing mechanism for a resin-based fiber placement system comprises a mounting frame, more than one double-acting cylinders fixed on the upper end of the mounting frame, each double-acting cylinder is connected to a lower air nozzle and an upper air nozzle; each double-acting cylinder is connected to a movable blade part via a connecting shaft and a spring; the movable blade part comprises a movable blade mounting frame, and a movable blade is mounted on the movable blade mounting frame; the movable blade mounting frame is connected to a slider, the slider is connected to a guide rail, and the guide rail is connected to the mounting frame via a guide rail pressure strip, the movable blade and the fixed blade engage to cut, and the fixed blade is fixed to the lower end of the mounting frame; the movable blade and the fixed blade are pressed together with a mounting frame cover, the mounting frame cover is connected to the mounting frame, and the mounting frame and the mounting frame cover are correspondingly provided with square holes; the present invention is assembled and formed in an integrated manner, and the disassembly and replacement of the tool is easy, the service life is long, the incision quality is good, and the equipment reliability of the automated fiber placement system is improved.

A hydraulic ball injector for a fracturing wellhead comprises a ball storage barrel, a barrel cover, a slide wall plate, a base flange, a rectangular end plate and a hydraulic oil cylinder. A ball storage barrel internally provided with a spiral slide way is formed by welding an outer barrel pipe, an inner barrel pipe, a round bottom plate, paired spiral guide plates, vertical baffles and hinged plates. The periphery of the barrel cover is bent downwards, an elastic bolt is welded on one side of the barrel cover, two hinge plates are welded on the other side of the barrel cover, and the barrel cover is connected with the ball storage barrel through a B-shaped pin shaft, a flat washer and a cotter pin; a transverse slide way is formed by welding two slide way wall plates and a rectangular end plate below a round bottom plate of the ball storage barrel and above a base flange; a double-acting hydraulic oil cylinder connected with a single piston rod and a lug ring and provided with a rectangular flange at the front end is fixed on the rectangular end plate through a bolt and a spring washer; a rectangular ball taking sliding block is inserted into the transverse sliding way, a through hole in the inner end of the rectangular ball taking sliding block is connected with a lug ring of the hydraulic oil cylinder through an A-shaped pin shaft, and the hydraulic drive ball injector is simple in structure, unified in control and reliable in action.

A cylinder is a double-acting single-rod cylinder, one end of the cylinder is a cylinder rodless cavity, the other end of the cylinder is a cylinder rod cavity, and a cylinder body of the cylinder is sequentially provided with sensors I, II and III for detecting the position of a piston or a piston rod; high-speed operation is carried out in sensor I and II regions, and low-speed operation is carried out in other regions; a rodless cavity of the air cylinder is communicated with an OR valve I, and the OR valve I is connected with two-position three-way reversing valves I and II in parallel; a rod cavity of the air cylinder is communicated with an OR valve II, and the OR valve II is connected with two-position three-way reversing valves III and IV in parallel; the two-position three-way reversing valves I and III are connected in parallel, then connected in series with a low-speed pressure reducing valve 1 and connected with an air source; the two-position three-way reversing valves II and IV are connected in parallel, then connected in series with a high-speed pressure reducing valve and connected with an air source; the low-speed pressure-reducing valve and the high-speed pressure-reducing valve are The device is fast in opening and closing, stable in starting, low in cost, good in effect, safe to operate, simple to debug, capable of avoiding door flying, capable of improving installation efficiency and suitable for popularization.

The invention relates to the technical field of anti-unmanned aerial vehicles, in particular to a net capturing power mechanism for anti-unmanned aerial vehicles, which comprises an unmanned aerial vehicle, a launch canister, a launch head and a connecting rope, launching cylinders are fixedly arranged at the lower ends of the unmanned aerial vehicles, the lower ends of the launching cylinders are in pushing connection with launching heads, the lower ends of the launching heads are connected with connecting ropes, the four launching cylinders, the four launching heads and the four connecting ropes are arranged on the four unmanned aerial vehicles, the four connecting ropes connect the four corners of the catching net, and the catching net is pushed in a pushing mode; the side end of the launching head is limited through a limiting switch, the limiting switch carries the launching head, the limiting switch is installed on a launching barrel, a double-acting hydraulic cylinder is arranged in the launching barrel, and the double-acting hydraulic cylinder stretches out and draws back in the launching barrel in a reciprocating mode. Through the arrangement of the structure, the net capturing work of the unmanned aerial vehicle is facilitated.

The utility model relates to a double-acting steering system for an aerial work platform, which comprises a steering axle, a double-acting oil cylinder, a connecting rod, a cross joint lug plate, cross joints and hubs, the double-acting oil cylinder is fixed on the steering axle, the cross joints are symmetrically hinged to the left side and the right side of the steering axle, and the cross joints are rotatably connected with the hubs through bearings. Cross joint lug plates are fixedly connected to the cross joint, connecting rods are symmetrically arranged on the left side and the right side of the double-acting oil cylinder, one ends of the connecting rods are hinged to the two cross joint lug plates arranged up and down, and the other ends of the connecting rods are hinged to the movable end of the double-acting oil cylinder. Two piston rods of the double-acting oil cylinder are pushed to move left and right through system pressure oil, left-right movement of tires is achieved, linkage mechanisms of the tires on the two sides are fully reduced, the rotation stability and torsion of the tires on the two sides in the rotation process are enhanced, and the structural strength is effectively enhanced; and through transition connection of the connecting rod, the rotating bending torsion of the piston rod of the double-acting oil cylinder is reduced, and the service life of the double-acting oil cylinder is prolonged.

A damping system of an active chassis for one wheel of a motor vehicle. The system includes a double-acting hydraulic cylinder and a damper having a piston, which damper is couplable to a wheel suspension system for the wheel. The system also includes a hydraulic pump, and a hydraulic unit having a hydraulic reservoir and valves. The hydraulic pump and the hydraulic unit cooperate with hydraulic chambers of the hydraulic cylinder such that, depending on the direction of conveyance of the hydraulic pump, a movement of the piston in a first direction of actuation or in a second direction of actuation can be provided. The damper includes the hydraulic cylinder and the piston is designed such that, in the region of the damper, a flow of hydraulic oil via the piston or along the piston of the damper is at most 3 L / min.

The invention relates to an automatic screw nut ball assembling device and a pneumatic ball feeding method. Comprising a fixed seat, a material pushing assembly arranged on the fixed seat, a vibration disc arranged above the material pushing assembly and used for conveying balls, a controller electrically connected with the material pushing assembly and the vibration disc, and a ball filling assembly arranged on the fixed seat and located in front of the material pushing assembly. Wherein the pushing assembly comprises a first lifting frame installed on the fixing base, a ball guide rail body arranged on the front side of the first lifting frame and a stop dog connected with the lower portion of the ball guide rail body, and the ball filling assembly comprises a positioning sleeve connected with the stop dog. The controller integrally controls execution components such as the vibration disc, the pushing air cylinder and the double-acting air cylinder, full-process automation from ball conveying, number limiting, ball falling and guiding to pneumatic ball blowing is achieved, continuous cycle operation can be completed through one-key starting only by manual feeding and discharging, the assembly efficiency is improved, and the automatic ball feeding and discharging device can be easily integrated with an automatic production line.

The invention relates to a double-acting hydrodynamic axial sliding bearing (1) comprising: a bearing housing (2) in which there is located a first bearing body (3) having a first axial bearing surface (4), and a second bearing body (5) having a second axial bearing surface (6); and a shaft (7) comprising at least one thrust collar (8), wherein the at least one thrust collar is located in the bearing housing between the first axial bearing surface and the second axial bearing surface and can be supported against the first or second axial bearing surface depending on the axial position of the shaft, and a first or second annular chamber (9, 12) is formed depending on whether the thrust collar is supported against the first or second axial bearing surface.