2256 results about "Piston cylinder" patented technology

The present invention relates to the technical field of waste heat recovery equipment, and specifically discloses a waste heat recovery device for flue gas in a thermal power plant. It includes a box body with an upper smoke chamber, a heat exchange chamber and a lower smoke chamber inside. A number of smoke pipes connecting the upper smoke chamber and the lower smoke chamber are fixed in the heat exchange chamber; above the smoke pipes, there is a piston cylinder fixed by the box body; the upper end of the piston cylinder is connected to a high-pressure gas supply pipe, and a piston is arranged inside. The piston is connected with a scraping head through a push rod; side holes are provided on the push rod; when the high-pressure gas drives the piston to move downward, the scraping head moves along the inner wall of the smoke pipe to scrape off the ash slag. The waste heat recovery device for flue gas in this thermal power plant has a cleaning function and a better cleaning effect, high heat exchange efficiency and good waste heat recovery effect. The waste heat recovery device for flue gas in this thermal power plant can be automatically cleaned without disassembling components, is fast and efficient, and can be operated online. The ash slag scraped off during the cleaning process can be centrally recovered, avoiding re-mixing into the flue gas again, reducing the workload in the flue gas dust treatment link, and saving the subsequent environmental protection treatment cost.

Systems and methods are provided for a portable air compressor comprising an electric battery, an electric motor, a piston, and an air hose. The electric motor is powered by the electric battery. The piston is coupled to and driven by the electric motor. The piston is configured to compress air within a piston cylinder. The air hose has a first end attachable to an air outlet of the piston cylinder and a second end attachable to an inflatable object. The portable air pump is configured to inflate the inflatable object to a target air pressure. When the target air pressure is below a predetermined pressure threshold, the portable air pump inflates the inflatable object at a first inflation rate. When the target air pressure is above the predetermined pressure threshold, the portable air pump inflates the inflatable object at a second inflation rate greater than the first inflation rate.

The seabed imaging sonar comprises a receiving transduction module, the receiving transduction module comprises a receiving plate, an annular sealing block, a socket and a front cover, a first mounting opening is formed in the middle of the front cover, the annular sealing block is arranged at the edge of the first mounting opening, and the receiving plate is arranged at the first mounting opening; the annular sealing block is at least partially attached to the inner side face and the side edge of the receiving plate. The socket is arranged on the inner side face of the receiving plate and located in the middle of the annular sealing block. The shell is internally provided with a pressure balance cavity, the pressure balance cavity is filled with a compressible fluid medium, the side wall of the shell is provided with a second installation opening, the front cover is installed at the second installation opening, and the socket is located in the pressure balance cavity; and the piston assembly comprises a piston cylinder and a piston, the piston is movably arranged in the piston cylinder, and one end of the piston cylinder communicates with the pressure balance cavity so as to allow the compressible fluid medium to enter the piston cylinder.

The invention discloses a special cooling device for a computer GPU (Graphic Processing Unit) cluster server, which comprises a box body, a support frame, a circulating pipe, a cooling box, a first piston cylinder, a liquid outlet pipe, an injection pipe, a liquid inlet pipe, a heat dissipation mechanism, a cooling mechanism, a detection mechanism and an auxiliary mechanism, meanwhile, a filter plate can prevent dust in air from entering, a detection mechanism monitors the temperature in the box body in real time by utilizing the thermal expansion characteristic of alcohol, and a signal is transmitted to an external controller through a pressure sensor so that a worker can master the operation temperature state of the server in real time; the cooling mechanism automatically adjusts the flow speed and flow of cooling liquid according to temperature changes so as to meet the heat dissipation requirements of the server under different loads, the auxiliary mechanism conducts rolling sweeping on a filter plate through a cleaning roller, smooth air circulation is ensured, the efficient and intelligent cooling effect is achieved, and the service life of the server is prolonged. And the operation stability and the service life of the GPU cluster server are improved.

The invention discloses a stainless steel workpiece polishing device which comprises an equipment box body, wherein a polishing solution box is arranged on one side of the equipment box body; the rotating disc is rotationally arranged at the top of the equipment box body, a plurality of hollow shafts with negative pressure environments inside are rotationally arranged in the middle of the rotating disc, first vacuum suction cups used for fixing workpieces are installed at the tops of the hollow shafts, and sealing pistons used for cutting off negative pressure of the hollow shafts are arranged in the hollow shafts. An electromagnetic driving part for driving the sealing piston is arranged below the sealing piston; through cooperative work of a piston cylinder and a filter box and lifting cooperation of a lifting plate, a lifting piston and the piston cylinder, dust collection, filtering and spraying of a polishing solution can be achieved while the lifting plate is stably guided, dust and waste gas generated in the polishing process can be effectively collected, environmental pollution is reduced, and the polishing effect is improved. And the polishing liquid can be automatically pressurized and sprayed, so that cyclic utilization of air is realized, and the energy consumption is reduced.

The utility model belongs to the field of clamps, and particularly relates to an anode carbon block stacking clamping clamp which comprises a support. Support arms are rotationally connected to the two sides of the support; a clamping plate is hinged to the bottom of the supporting arm; a connecting assembly is arranged above the support arm; the top of the support is fixedly connected with a piston cylinder; a piston rod is connected in the piston cylinder in a sliding manner; the bottom end of the piston rod is fixedly connected with a bottom plate; the bottom of the piston cylinder is fixedly connected with a flexible pipe; by arranging a spray head, a piston cylinder, a piston rod and a flexible pipe, when a support moves downwards, the piston rod is extruded by the top side of an anode carbon block, a rod cavity of the piston cylinder sucks air, and when the support moves upwards, the piston rod moves downwards under the action of gravity, so that air is extruded and sprayed out, a clamping plate is purged by the spray head, and then the clamping surface of the clamping plate is cleaned; therefore, friction force reduction caused by the fact that foreign matter or dust adheres to the clamping faces of the clamping plates can be reduced, and then the situation that anode carbon blocks fall off is reduced.

The invention discloses a method and device for polishing and strengthening the inner surface of a variable-diameter elbow, and relates to the field of polishing equipment, the variable-diameter elbow and piston cylinders located at the two ends of the variable-diameter elbow are included, and the piston cylinders comprise the left piston cylinder and the right piston cylinder; a first piston, a second piston and a third piston are arranged in the left piston cylinder, the first piston is independently arranged in the left piston cylinder, the second piston and the third piston are oppositely arranged in the left piston cylinder, and the left piston cylinder is further provided with a water flow inlet and a grinding material flow inlet. A fourth piston, a fifth piston and a sixth piston are arranged in the right piston cylinder, the sixth piston is independently arranged in the right piston cylinder, the fourth piston and the fifth piston are oppositely arranged in the right piston cylinder, and the right piston cylinder is further provided with a water flow outlet and a grinding material flow outlet. A mold is arranged in the variable-diameter bent pipe, the shape of the mold is subjected to profiling machining according to the shape of the variable-diameter bent pipe, the radial section width between the variable-diameter bent pipe and the mold is controlled through the mold, and uniform polishing is achieved.

The utility model belongs to the technical field of hydraulic execution components, and particularly relates to a hydraulic cylinder sleeve type connector which comprises a hydraulic cylinder sleeve body, a pipeline connecting piece is fixed at the upper end of the hydraulic cylinder sleeve body, an upper connecting piece is fixed inside the pipeline connecting piece, and a sealing ring is fixed at the lower end of the upper connecting piece. A centering conical barrel is fixed to the lower side of the hydraulic cylinder sleeve body, symmetrical locking hydraulic cavities are formed in the lower end of the interior of the hydraulic cylinder sleeve body, hydraulic cylinder covers are fixed to the upper ends of the symmetrical locking hydraulic cavities, limiting grooves are formed in the left side and the right side of an upper connecting piece, clamping jaws are arranged in the two limiting grooves, and a clamping block is arranged in the clamping jaws. The hydraulic piston cylinder moves to drive the piston connecting rod to move, so that the piston connecting rod drives the driving ring plate on the side wall to move, the driving ring plate is matched with the clamping jaw, the upper connecting piece and the lower connecting piece are clamped, locking and unlocking are easier, and the locking effect is better.

The invention discloses multifunctional lead brick extrusion equipment with a replaceable mold, relates to the technical field of lead processing, and aims to solve the problems of production stagnation and economic loss caused by idle equipment due to long consumed time of the whole process when the mold is replaced in the prior art, the multifunctional lead brick extrusion equipment comprises a base, and the top of the base is fixedly connected with a plurality of guide frames; the outer wall of the guide frame is slidably connected with a pair of symmetrically arranged extrusion plates, the bottom of the extrusion plate on the lower side is fixedly connected with the top of the base, the top of the guide frame is fixedly connected with a top cover, and the bottom of the top cover is fixedly connected with a hydraulic rod; and the other end of the hydraulic rod is fixedly connected with the top of the extrusion plate on the upper side, a pair of piston cylinders are arranged on the top of the base, and corresponding molds are arranged on the opposite faces between the extrusion plates. The method has the advantage that the idle time of equipment caused by die replacement is greatly shortened.

The utility model discloses a flattening device for brake pad steel backing processing, which relates to the technical field of steel backing processing and comprises a base body, a mounting bottom plate is fixedly mounted at the top of the base body, a lower pressing tool is mounted at the center of the upper surface of the mounting bottom plate, and supporting columns are fixedly mounted at four corners of the mounting bottom plate. An oil press is fixedly installed at the top ends of the supporting columns, an upper pressing plate is fixedly installed at the output end of the oil press, and buffering assemblies are installed on the upper surface of the installation bottom plate and located on the two sides of the lower pressing tool. The piston rod drives the piston to the bottom of the piston barrel, gas in the piston barrel is squeezed into the gas outlet pipe and finally blown out through the gas blowing box, sweeps on the surface of the lower pressing tool are blown to fall into the collecting drawer, and after a period of time, an operator draws out the collecting drawer and cleans the sweeps in a concentrated mode. Scraps are prevented from being accumulated on the surface of the lower hold-down clamp to affect the follow-up flattening operation of the brake pad steel backing, and then the overall operation speed is prevented from being affected.

The invention discloses an electromagnetic valve vibration fatigue test device and a failure judgment method, and relates to the technical field of electromagnetic valve tests.The electromagnetic valve vibration fatigue test device comprises a test box, a conveying mechanism, a balance weight mechanism, a vibration table, an opening and closing detection mechanism and a clamping detection mechanism; the front end and the rear end of the top in the test box are fixedly connected with counterweight mechanisms, the bottom in the test box is fixedly connected with a vibration table, the right end in the test box is fixedly connected with an opening and closing detection mechanism, and the top of the vibration table is fixedly connected with a clamping detection mechanism and a conveying mechanism; the inlet and outlet pressure of the detected electromagnetic valve is detected through a sensor, failure judgment of the electromagnetic valve is achieved, then the pressure is adjusted through the combination mode of low-speed precise conveying of a piston cylinder and high-speed large-flow conveying of an external fluid conveying box, periodic fluid pressure fluctuation is applied while vibration is conducted, and the real load of the electromagnetic valve is simulated. And the superimposed effect of mechanical vibration and fluid impact is synchronously tested.

The invention provides a hydraulic control and hydraulic drive coiled tubing tractor. The problems that an existing tractor is complex in structure and low in control stability are solved. The first piston cylinder, the second piston cylinder and the third piston cylinder are sequentially arranged on the center pipe in the length direction of the center pipe. Connecting rod supporting mechanisms are arranged at the ends, away from the second piston cylinder, of the first piston cylinder and the third piston cylinder, and the first piston cylinder and the third piston cylinder are used for controlling the two connecting rod supporting mechanisms to be folded and unfolded alternately; the first piston cylinder and the second piston cylinder are installed on the center pipe, the third piston cylinder is installed on a piston rod of the second piston cylinder, a hydraulic control driving assembly used for controlling the first piston cylinder, the second piston cylinder and the third piston cylinder to move is installed on the outer wall of the center pipe, and a drilling fluid inlet is formed in the side wall of the center pipe and communicated with the liquid inlet end of the hydraulic control driving assembly. The single telescopic hydraulic cylinder is adopted, the traction period is shortened, the traction speed is increased, meanwhile, only the pressure of drilling fluid needs to be controlled in the traction process of the tractor, and the system operation stability is high.

The invention relates to a bridge abutment settlement deformation monitoring device and method, and belongs to the field of bridge monitoring, the bridge abutment settlement deformation monitoring device comprises two bearing frames arranged on one side of a bridge pier and a steel wire rope I arranged between the bearing frames and used for supporting a connecting support, and the top of the connecting support is provided with a monitoring mechanism; the monitoring mechanism comprises a plurality of piston cylinders adjustably arranged at the top of the connecting support, piston push rods are slidably arranged at the tops of the piston cylinders, extension rod pieces fixedly connected with the piston push rods are fixedly arranged on one side of the pier, and display sleeves are fixedly arranged on the two sides of the connecting support. The display sleeve is communicated with the piston cylinder body through a connecting pipeline and used for transmitting liquid prefabricated in the piston cylinder body, and a piston sliding block is arranged in the display sleeve in a sliding mode. The double steel wire ropes and the tension jack form an elastic supporting system to buffer vibration, the hydraulic linkage design converts tiny settlement into visual displacement, the spring reset mechanism is matched to improve data reliability, automatic reset is achieved, continuous monitoring is supported, and the monitoring range is expanded.

The invention discloses a preassembled shockproof box-type transformer substation, and relates to the technical field of transformer substations, the preassembled shockproof box-type transformer substation comprises a transformer box and a base, damping mechanisms are arranged on the two sides of the base, the damping mechanisms are connected with the side edges of the base through mounting plates, the damping mechanisms are self-adaptive hydraulic damping mechanisms, and each damping mechanism comprises a piston cylinder, a buffer rod, a trigger assembly and an adjusting assembly; the piston cylinder is filled with hydraulic oil and provided with a piston disc dividing an inner cavity of the piston cylinder into an upper cavity and a lower cavity, the upper end of the buffer rod is connected with the piston disc, and the lower end of the buffer rod extends out of the piston cylinder and is provided with a contact block. The problems that in the prior art, when a power transformation box is installed, due to the fixed damping characteristic, a traditional spring shock absorber cannot be adjusted in a self-adaptive mode to adapt to the variable falling speed and the box body weight, and the buffering effect is mismatched with the impact working condition are solved. The device has the advantages that impact energy of different intensities is effectively dissipated through a multi-stage buffering and automatic adjusting mechanism, and the safety of electrical elements in the box-type substation during installation and operation is ensured.

The present invention discloses a testing device for a rubber water stop joint, which relates to the technical field of rubber water stop joints; in order to improve the detection efficiency; specifically, it includes a base, a supporting part and a testing part for performing a pressure test on the main body of the water stop joint. The testing part includes: a bracket: which is fixed on the outer wall of the top of the base, and a piston cylinder is fixed on the outer wall of the top of the bracket, and a filling pipe and an adjusting pipe are respectively welded on the circumferential outer wall of the piston cylinder; a piston plate: which is movably connected to the inner wall of the circumferential wall of the piston cylinder. In the present invention, by providing a driving plate, the bending seat can be driven to rotate, so that the top of the main body of the water stop joint can be twisted by the rotation of the bending seat, so that the anti-twisting performance of the bending seat can be tested. At the same time, by using the first kidney-shaped hole, the circumferential movement of the driving plate can be converted into the linear movement of the ejector rod, and the ejector rod can be used to drive the piston plate to move downward, so as to test the pressure resistance performance of the main body of the water stop joint.

The invention relates to the technical field of detergent detection, and discloses a synthetic detergent production detection device which comprises a product conveying line and a detection table, the detection table is located on the left side of the product conveying line, an annular feeding piece is arranged at the top of the detection table, and a sample cup is placed at the top in the annular feeding piece; a driving shaft is rotatably connected to the detection table, a raised line I is fixedly mounted on the circumferential surface of the driving shaft, a shaft sleeve is slidably connected to the driving shaft and the raised line I, and a piston sampling piece is arranged between the top of the driving shaft and the top of the shaft sleeve; and a viscosity detection piece is arranged on the rear side of the top of the detection table. When the piston barrel deflects to the position over the product conveying line, the output end of the second air cylinder shrinks, so that the interior of the piston barrel is in a negative pressure state, and the detergent enters the piston barrel; after the piston barrel moves to the position over the sample cup, the output end of the second air cylinder extends, and the detergent in the piston barrel is extruded into the sample cup; therefore, the purpose of automatic sampling is achieved.

The invention discloses a high-precision long-time accidental partial discharge diagnosis and positioning device, and relates to the technical field of high-altitude cable detection devices, the high-precision long-time accidental partial discharge diagnosis and positioning device comprises a shell capable of moving on a cable, and further comprises an ultrasonic detector mounted on the shell; and the vibration mechanism comprises a buffer assembly, the input end of the buffer assembly is located on the outer side of the shell, and the output end of the buffer assembly is located on the inner side of the shell and communicates with a piston barrel. The vibration mechanism is arranged, external wind power is converted into pushing force for pushing hydraulic oil through the buffer assembly, finally, a knocking block forms knocking vibration on the cable, a vibration damper plate makes contact with the surface of the cable in the knocking process, and the vibration frequency of the cable when the cable is vibrated by the knocking block is changed; therefore, the vibration frequency of the ice blocks attached to the surface of the cable is changed through the change of the vibration frequency, the ice blocks are further broken and fall off, and the removal effect of the ice blocks on the cable is improved.

The invention relates to the technical field of industrial water treatment equipment, and discloses an intelligent flushing self-cleaning filter system for industrial water treatment. A dynamic suspended matter monitoring module of the system collects three-dimensional distribution data of deposits on the surface of a filtering medium in real time, and mixed deposition characteristics of suspended solids and oil stains are recognized through a multispectral imaging technology; the differential pressure trigger control module establishes a mapping relation between sediment thickness and fluid resistance according to the three-dimensional distribution data, and generates a cleaning trigger instruction when the real-time differential pressure data reaches a dynamic threshold interval; the spiral trajectory planning module analyzes the cleaning trigger instruction, and generates a composite motion trajectory containing a rotation angular velocity and an axial displacement rate in combination with the current position of a suction nozzle and a filter screen topological structure; the multi-mode flushing execution module synchronously adjusts torque output of a hydraulic motor and linear displacement of a piston cylinder based on the composite motion trail, so that a suction nozzle covers the whole effective filtering area of a filter screen along a spiral path.

The invention relates to the technical field of compression resistance detection, in particular to a compression resistance detection device suitable for a mobile phone screen. The compression resistance detection device suitable for the mobile phone screen comprises a frame, a controller, a supporting frame, a motor, a gear set, a lead screw set, a pressure head, a supporting block, a rotating frame, a carrier roller and a control assembly, the controller is installed on the right side wall of the frame, the supporting frame is connected to the middle of the top of the frame, and the motor is installed on the top of the supporting frame. Dynamic outward movement of a screen bottom supporting force acting line is achieved through a rotating structure of the rotating frame and the carrier roller in cooperation with a buffering system of the piston cylinder, when a pressure head is loaded, the carrier roller automatically adjusts the supporting position along with screen deformation, the edge supporting force evenly moves outwards along with pressure increase, the edge local overload risk is effectively reduced, and the service life is prolonged. And compared with a traditional fixed supporting detection mode, detection data is closer to the actual compressive strength mean value of the screen.

The present application provides an oil-gas separation apparatus capable of implementing complete degassing and methods. The apparatus comprises: a piston cylinder and a degassing cylinder, a degassing solenoid valve being arranged between the degassing cylinder and the piston cylinder, one end of the degassing solenoid valve extending into the interior of the piston cylinder, and the other end thereof being in communication with the degassing cylinder; a variable speed diaphragm pump, an air intake end thereof being in communication with the atmosphere and an air discharge end thereof being in communication with the degassing cylinder for drawing ambient air, and used for cleaning a gas path of the oil-gas separation apparatus, and providing power for the degassing cylinder, thereby replacing a design involving a carrier gas cylinder or a gas generator; and a main control module. According to the present application, the piston cylinder, the degassing cylinder, the degassing solenoid valve, and the variable speed diaphragm pump are integrated and are uniformly controlled by the main control module, so that high-efficiency oil and gas separation is implemented. A unique degassing control method and a concentration calculation method are designed, so that fast and efficient degassing is implemented, nearly complete degassing is achieved without correcting a degassing rate, a mathematical model for inverse calculation of an oil sample concentration on the basis of a gas concentration is simplified, and concentration conversion is convenient.

The utility model relates to the technical field of buffering protection, and discloses a spring hydraulic buffering protection device which comprises a damping piston cylinder and a piston rod, the damping piston cylinder is matched with the piston rod, a collided head is installed at the top of the piston rod, an elastic buffering cap is installed at the top of the collided head, a thrust spring is sleeved outside the piston rod, and the elastic buffering cap is sleeved outside the piston rod. The two ends of the thrust spring are fixed to the top of the damping piston barrel and the bottom of the elastic buffer cap respectively, the elastic buffer cap is made of high-elasticity materials and can effectively absorb impact force, and the bottom of the piston rod penetrates into the damping piston barrel in a sealed mode. By utilizing the damping characteristic of liquid flow and the elastic deformation of the spring, double buffering on impact force is realized, the stability and durability of the device are obviously improved, the vibration frequency of equipment in high-speed operation is effectively reduced, and the service life of the equipment is prolonged.

The invention discloses a stainless steel electric regulating valve, and particularly relates to the technical field of electric regulating valves, the stainless steel electric regulating valve comprises a valve body, a driving assembly, a valve core assembly and a connecting assembly, a liquid inlet cavity, a liquid outlet cavity and a regulating cavity are formed in the valve body, and the valve core assembly is arranged in the regulating cavity; the valve element assembly can seal and communicate the liquid inlet cavity and the adjusting cavity through movement, the connecting assembly comprises a connecting cavity formed in the upper end of the adjusting cavity, a pressure adjusting cylinder is arranged at the upper end of the connecting cavity, and a first piston cylinder and a second piston cylinder are arranged in the connecting cavity. By arranging the first valve element, the second valve element and the pressure adjusting cylinder, liquid is prevented from forming vortex at the bottom of the valve body, the water hammer effect of the electric control valve is buffered, meanwhile, error correction is conducted on the electric control valve after the electric control valve is completely opened every time, and the safety of the electric control valve is improved. Therefore, the flow control precision is improved, and the service life of the electric control valve is prolonged.

The lifting and rotating integrated hydraulic cylinder comprises a furnace cover, a furnace cover arm, a cylinder barrel, a rotating shaft and a piston cylinder, the rotating shaft is arranged in the cylinder barrel, the lower end of the rotating shaft is connected with a piston rod of the piston cylinder, the piston rod of the piston cylinder is pushed or contracted, and the rotating shaft moves upwards or downwards along the inner wall of the cylinder barrel. The upper end of the rotating shaft is connected with the furnace cover through the furnace cover arm; a rotating shaft is arranged in the cylinder barrel, a shaft is transversely inserted in a shaft body of the rotating shaft, the two ends of the shaft protrude out of the outer surface of the rotating shaft and are provided with bearings, correspondingly, two inclined moving grooves are oppositely formed in the barrel wall of the cylinder barrel, and the bearings are located in the moving grooves to limit the rotating shaft when the rotating shaft moves up and down. The lifting and rotation of the furnace cover can be simultaneously controlled by only one piston cylinder, the operation is stable, and the structure is simple.

The invention relates to a surge protector withstand voltage test system and method, and belongs to the technical field of surge protectors, the system comprises a test tool, the test tool comprises a tool body, a pneumatic execution component and a PCB function board, the tool body is made of bakelite, metal handles are arranged on the two sides of the tool body, and a detachable cover plate is fixed to the bottom of the tool body through hinges and lock catches; a wiring groove is formed in the inner side of the cover plate; the pneumatic execution component comprises a double-piston cylinder, a slide rail, a clamp assembly and an elastic conductive elastic needle; the double-piston cylinder drives the clamp assembly to linearly move along the X direction through the slide rail so as to clamp the surge protector to be tested; the elastic conductive elastic needle is fixed on the clamp assembly, the head of the elastic conductive elastic needle is in elastic contact with an exposed contact of the tested surge protector, and the tail of the elastic conductive elastic needle is connected to the PCB function board through a wire; the PCB function board comprises a high voltage constant current source circuit, a multipath relay switching circuit and an MCU control module.

The invention provides a hydrodynamic actuator which comprises a piston cylinder, a piston, a piston rod for connecting the piston and the outside of the piston cylinder, and a cylindrical piston cylinder sleeve, the piston cylinder sleeve is connected to the outer side of the piston cylinder in a sleeving mode from the first piston cylinder end cover. A sealing piece matched with the inner wall of the piston cylinder sleeve is arranged on the outer wall of the piston cylinder and / or the first piston cylinder end cover; the piston rod penetrates through the first piston cylinder end cover of the piston cylinder and is fixedly connected with the bottom of the piston cylinder sleeve; a first driving fluid cavity is formed between the piston and the first piston cylinder end cover; a second driving fluid cavity is formed between the first piston cylinder end cover and the piston cylinder sleeve; a fluid rotation cavity is formed between the piston and the second piston cylinder end cover. The technical scheme can be widely applied to the field of force transmission components such as hydraulic cylinders and pneumatic cylinders.

The utility model relates to a stable gathering and transporting device and system for oil field produced liquid, the stable gathering and transporting device for the oil field produced liquid comprises a piston cylinder body, a piston, a one-way valve, a centrifugal machine and a communicating pipe, the side wall of the piston cylinder body is communicated with a produced liquid output port of an oil well Christmas tree through the communicating pipe, and the one-way valve is arranged on the communicating pipe; a liquid outlet is formed in the bottom of the piston cylinder body and communicated with an inlet of the centrifugal machine with the freezing function through a liquid pipeline, the piston is arranged in a cavity of the piston cylinder body and connected with a piston connecting rod, and the piston connecting rod extends out of the upper end of the piston cylinder body and can drive the piston to move up and down to open or plug the liquid outlet. Fluid in the piston cylinder body is pushed to flow to the centrifugal machine. Through the arrangement of the piston cylinder body, the piston, the one-way valve, the centrifugal machine and the communicating pipe, salt crystals in an oil-water mixture of produced liquid can be separated from the oil-water mixture by utilizing the centrifugal machine, the faults of a produced liquid gathering and transportation system caused by blockage of the pipeline by the salt crystals are eliminated, and stable and continuous gathering and transportation of the produced liquid of an oil field are realized.

The invention relates to the technical field of bearing tests, in particular to a loading device and a loading method for a low-temperature bearing test of a spaceflight turbine pump. Comprising a test shaft shell, a test bearing A, an axial loading gland, an axial loading piston cylinder shell, an axial loading piston, a variable-diameter piston cylinder shell, a variable-diameter piston cylinder piston, a vaporizer, a test bearing B, a liquid nitrogen pipeline, a nitrogen pipeline and a hydraulic oil pipeline. Liquid nitrogen enters a test shaft shell from a liquid nitrogen pipeline to be fully cooled and then is discharged, the liquid nitrogen is converted into nitrogen through heat exchange of a vaporizer, the nitrogen is introduced into a variable-diameter piston cylinder shell through a nitrogen pipeline to push a variable-diameter piston cylinder piston to compress hydraulic oil, and the hydraulic oil is introduced into an axial loading piston cylinder shell to generate oil pressure to push an axial loading piston to move. The axial loading piston generates thrust on the axial loading gland to promote the axial loading gland to complete thrust loading on the test bearing, the electric cylinder is adopted to directly apply push-pull force load to the variable-diameter piston rod, load fluctuation is compensated, and stability of the test load is guaranteed.

The utility model relates to the technical field of pipeline welding, in particular to a welding tool for stainless steel pipe welding production, which comprises a rack, a support plate, a piston cylinder, a telescopic rod I, a telescopic rod II, a clamping block I and the like. The welding tool comprises a rack, the rack is a mounting carrier of the welding tool, a supporting plate is fixedly connected to the top of the rack, a piston cylinder is fixedly connected into the supporting plate in a penetrating mode, the top of the piston cylinder communicates with a first telescopic rod, a first clamping block is installed at the telescopic end of the first telescopic rod, and the first clamping block is matched with the supporting plate to vertically clamp a stainless steel pipe. The sliding plate is pushed through the multi-stage telescopic air cylinder, the sliding plate elastically acts on the connecting plate, so that the piston rod can elastically compress air pressure in the piston cylinder, the air pressure respectively acts on the telescopic rod I and the telescopic rod II, and the clamping block I and the clamping block II can elastically clamp a stainless steel pipe. And therefore, the effect of accurately controlling the clamping force adaptive to the stainless steel pipes with different sizes is achieved.

The utility model relates to the field of automatic polishing, in particular to a parallel six-degree-of-freedom floating polishing tool platform. A parallel six-degree-of-freedom floating grinding tool platform comprises a base, a plurality of connecting rod assemblies and a floating seat used for installing a tool clamp. The connecting rod assembly comprises two joints, two crosses, a piston assembly and a pressure sensor; the two connectors are connected to the two ends of the piston assembly through the two crosses. The connector and the piston assembly are rotationally connected to the cross. The piston assembly comprises a piston cylinder and a piston rod. The grinding tool platform has the advantages that the grinding tool platform has the floating function to replace the floating function of a floating grinding head. The pressure sensor is used for detecting the gas pressure in the closed gas cavity, and the direction, the magnitude and the displacement of the force borne by the parallel six-degree-of-freedom floating polishing tool platform can be calculated through the pressure change in the closed gas cavity of the multiple piston assemblies, so that the force control function of a six-dimensional force sensor is replaced.

The utility model relates to the technical field of regulating valves, and discloses a self-operated high-pressure-difference regulating valve which comprises a pipeline assembly and a buffer assembly installed in the pipeline assembly, the pipeline assembly is fixedly installed on the two sides of a valve assembly, a transmission assembly is fixedly installed on the valve assembly, a feedback assembly is fixedly installed on the transmission assembly, and when equipment operates, the buffer assembly is fixedly installed on the pipeline assembly. Water flow passes through the water pipe and flows into the valve assembly, in the process, the liquid baffle is driven by high pressure to rotate and deviate inwards along the rotating rod, meanwhile, the liquid baffle is driven to rebound to the original position under the rebound effect of the rebound spring, part abrasion caused by a water hammer is avoided, meanwhile, liquid pressure is conducted to an inner cavity of the piston cylinder through the communicating pipe, and the valve element and the valve rod are driven to be pressed downwards; in the downward pressing process, the through hole in the communicating position of the through groove and the valve element is gradually reduced, and therefore flowing hydraulic pressure is adjusted more smoothly and stably.