15867 results about "Piston rod" patented technology

A sheet metal part stamping apparatus, comprising a machine body (1), wherein a support pillar (2) is mounted on one side of the top of the machine body; a second guide hole (36) is formed in the side surface of the support pillar; a second sliding plate (41) is slidably mounted in the second guide hole; an adjustment disk (14) is rotationally mounted at the bottom of one end of the second sliding plate (41); several storage holes (42) are formed in the top of the adjustment disk (14) near the edge; an annular groove (43) is formed on the top end of the inner wall of each storage hole (42); a magnetic ring (44) is mounted on the inner wall of each annular groove (43); a mounting iron block (45) is mounted inside each storage hole (42), and the mounting iron block (45) is located within the corresponding magnetic ring (44); and a pressing die (46) is mounted at the bottom of each mounting iron block (45). The magnetic rings can automatically fix the positions of the mounting iron blocks and the pressing dies by means of the magnetic forces thereof, and when a piston rod of a first hydraulic cylinder (13) moves up and down, the pressing dies can be automatically replaced, thereby making the apparatus more convenient to use, and improving the safety performance.

The utility model relates to an extruder with a vacuum waste material removing device. The extruder comprises a machine barrel and the vacuum waste material removing device, wherein the vacuum waste material removing device is mounted on a machine barrel and comprises a vacuum connecting seat, a gland, a cylinder seat plate, a vacuum guide column, a sealing assembly and a vacuum cylinder; the connecting base is installed above the machine barrel, the gland is installed on the top of the vacuum connecting base, the air cylinder base plate is arranged above the gland, one end of the vacuum guide column is connected with the air cylinder base plate, and the other end of the vacuum guide column sequentially penetrates through the gland and the vacuum connecting base, extends into the machine barrel and abuts against the screw rod. The vacuum cylinder is mounted on the cylinder seat plate; and a cylinder piston rod is connected with the gland. The vacuum guide pillar provided by the utility model is integrally designed, is simple to disassemble and convenient to maintain and clean regularly, and meanwhile, by arranging the sealing assembly, the sealing effect between the vacuum guide pillar and the gland is improved.

The invention provides a multi-dimensional supporting leg structure for lightweight steel ring splicing equipment, and relates to the field of tunnel engineering. The mounting base is fixedly connected with the frame, the telescopic driving mechanism is arranged between the mounting base and the supporting leg assembly, the angle adjusting mechanism is arranged between the cylinder barrel and the mounting base, and the self-locking mechanism is used for locking the cylinder barrel and the piston rod when the driving unit fails. The telescopic driving mechanism is composed of a cylinder barrel, a piston rod and a driving unit, the angle adjusting mechanism is driven through a first rotating shaft and a second rotating shaft which are perpendicular to each other and corresponding rotation, so that the cylinder barrel achieves double-shaft swing adjustment, the self-locking mechanism is composed of a locking rack, a movable tooth claw, a reset spring, an electromagnet and a permanent magnet, and power-on unlocking and power-off self-locking are achieved. According to the structure, the supporting polygon is obviously enlarged under the complex basic condition, the anti-overturning stability of equipment is improved, reliable supporting is kept when a hydraulic system fails, and the safety and adaptability of steel ring splicing operation in a tunnel are improved.

A windshield (8) including a pair of right and left sliding doors (13) and (14) is provided above an accommodation case (5) in which a weighing mechanism joined to a weighing pan (2) is disposed, the sliding doors (13) and (14) are slidably suspended and supported, and are linked to each other in an engageable and disengageable manner at their lower portions by a linkage mechanism including connection members (31) and (32), engagement / disengagement members (33) and (34), and a joint plate (60), and an air cylinder including a piston rod linked to the joint plate (60) and a pump as a drive source of the air cylinder are provided in the accommodation case (5). Since it is not necessary to separately provide a space for accommodating the air cylinder and the pump, the electronic balance (1) can be downsized.

The invention discloses a collaborative enhancement energy consumption mechanism and a support arm type fan tower drum damping device with the collaborative enhancement energy consumption mechanism, and relates to the technical field of engineering structure vibration, the collaborative enhancement energy consumption mechanism comprises a liquid column lever assembly and a plurality of inerter damping units symmetrically installed at the end of the liquid column lever assembly, and each inerter damping unit comprises a shell; the hydraulic damper and the linear-rotation converter are sequentially and axially installed in the shell from top to bottom, when the liquid column inclines, the first connecting plate is driven to drive the piston rod to stretch out and draw back, the piston rod drives the flywheel to rotate through the linear-rotation converter, and therefore vibration energy is transmitted to a fixed foundation structure through the second connecting plate to be dissipated; the invention further discloses a supporting arm type fan tower drum vibration reduction device, displacement of the vibration transmission part is transmitted to the liquid column lever through the connecting piece, the inerter damping unit is driven to stretch out and draw back, a complete energy consumption chain of the tower drum, the vibration transmission part, the connecting piece, the liquid column, the inerter damping unit and the ground is formed, and it is guaranteed that energy is stably transmitted to a fixed foundation structure.

The invention relates to the technical field of gas viscosity testing, in particular to a gas viscosity testing device and method suitable for multiple working conditions, the gas viscosity testing device comprises a constant temperature box, a capillary tube, a driving mechanism, a first cylinder and a second cylinder, and the first cylinder and the second cylinder have the same structure and are arranged oppositely. The device is reasonable and compact in structure, and the coaxial equal-diameter double cylinders which are oppositely mounted are adopted, so that two problems in a gas viscosity capillary method test can be solved: firstly, the gas state is adjusted, and the piston rod moves left and right by utilizing the driving mechanism, so that the volume of a rodless cavity of the cylinder is changed; in this way, the pressure increasing or reducing function can be achieved through the driving mechanism and the air cylinder, and therefore gas reaches the set pressure. The gas state is kept constant in the testing process, the first air cylinder and the second air cylinder are communicated with the capillary tube to form a closed testing loop in the testing process, the gas flow in the testing loop can be adjusted by changing the movement speed of pistons of the two air cylinders, and the requirement for conducting multiple sets of tests in the same gas state is met.

The invention discloses an antifouling self-cleaning line column type porcelain insulator and a detection method thereof, and relates to the field of insulators, a connecting bin is provided with a positioning rotating member, two ends of a movable sleeve block are provided with one-way drawing units connected with a piston rod, and a gas storage bin is provided with a rotating exhaust member. By arranging a position adjusting rotating part, a rotating exhaust part and a one-way pulling unit, when wind blows a fan blade plate, a reversing bevel gear can drive a transmission shaft to rotate clockwise so as to enable a reciprocating lead screw to rotate clockwise, and when a transmission gear ring rotates anticlockwise, the reversing bevel gear drives the transmission shaft to rotate clockwise so as to enable the reciprocating lead screw to rotate anticlockwise so as to enable the reciprocating lead screw to rotate anticlockwise. Therefore, when the second pawl rotates, the reciprocating screw rod rotates clockwise all the time, one-way rotation of the reciprocating screw rod can be achieved, then the rotating exhaust part and the one-way pulling unit are matched, the surface of the insulator body can be cleaned through airflow, and the self-cleaning effect is achieved.

The invention belongs to the technical field of piston rod machining equipment, particularly relates to a hydraulic oil cylinder piston rod machining device and a method thereof, and aims to solve the problem that an existing hydraulic oil cylinder piston rod machining device cannot integrally grind and polish a piston rod at a time. The bottom of the bearing platform is fixedly connected with the upper side of the base, the upper side of the base is fixedly connected with four symmetrical stand columns, and the upper sides of the four stand columns are fixedly connected with the same top plate. According to the hydraulic oil cylinder piston rod machining device and method, when the piston rod body is ground and polished through the device, fixing points, at the two ends of the piston rod body, of the clamp are switched; and therefore, when the device grinds and polishes the piston rod body, the whole piston rod body can be polished without halting, taking down the piston rod body and then fixing the piston rod body, the machining efficiency of the device on the piston rod body is remarkably improved, and the yield of the device is improved.

The present invention discloses an electronically controlled evaporator and its control method. The electronically controlled evaporator includes: a medicine storage module, a plunger pump system, and a valve seat module; the medicine storage module includes a medicine tank, a medicine lid, and a bent plate; the plunger pump system is composed of a cylinder block, a piston rod, a floating joint, a lead screw, a pump motor, a pipe joint, etc., to realize the suction and pushing of anesthetic liquid; the valve seat module includes a valve seat, an air outlet, a diffusion joint, an air inlet, a lower valve plate of the evaporation core, an upper valve plate of the evaporation core, an evaporation core motor, an evaporation core spring, a ferrule, a switching valve motor, an upper valve plate of the switching valve, a lower valve plate of the switching valve, etc., to realize the on / off of the anesthetic liquid and the volatilization of the anesthetic. The anesthetic output by the plunger pump of the present invention can quickly volatilize and mix with fresh gas when entering the evaporation core, thereby realizing precise control of the anesthetic concentration. At the same time, when it is necessary to close the anesthetic output, the anesthetic liquid outlet can be quickly closed.

The invention relates to the technical field of wafer bonding devices, in particular to a wafer bonding pressure control mechanism and method. The mechanism comprises a main driving unit and a bonding pressing rod linked with the main driving unit, the main driving unit drives the bonding pressing rod to move in the bonding pressure direction, bonding pressure is applied to a wafer through the bonding pressing rod, the bonding pressing rod is linked with the main driving unit through a pressure maintaining air cylinder, and the bonding pressing rod is arranged at the tail end of a piston rod of the pressure maintaining air cylinder; a displacement sensor is further included, the displacement change of the bonding pressing rod is detected through the displacement sensor, and the displacement sensor is electrically connected with the main driving unit. The main driving unit and the pressure maintaining air cylinder are combined to form a composite operation control system, the bonding pressure is controlled and adjusted by controlling the air pressure of the pressure maintaining air cylinder, and the stability of the bonding pressure is ensured.

The utility model relates to the technical field of sealing ring machining, and discloses a metal sealing ring machining device with a clamping function, which comprises a working table, an air cylinder is fixedly arranged at the top of the working table and can drive a moving plate to move up and down, and the moving plate is fixedly arranged at the bottom of a piston rod at the output end of the air cylinder and can drive the moving plate to move up and down. According to the metal sealing ring machining device with the clamping function, when a sealing ring needs to be polished, an air cylinder is started to drive the motor to move downwards, the moving plate can drive a connecting rod to push an extrusion rod, the motor is driven to move upwards, and the extrusion rod is driven to move downwards; and meanwhile, a Z-shaped rod can push a rotating rod to enable a rotating disc to rotate, a cylindrical rod can drive a clamping block to move outwards, the inner ring of the sealing ring can be clamped, in this way, the sealing ring can be clamped more tightly, and the situation that polishing is poor, and secondary machining is needed is avoided.

The invention discloses a testing machine for fatigue bending resistance of a piston rod of a hydraulic hoist, and relates to the technical field of hydraulic hoist detection equipment, the testing machine comprises a bottom plate, and a vertical impact simulation assembly and a horizontal impact simulation assembly for simulating impact loads in the vertical and horizontal directions are arranged above the bottom plate. According to the testing machine for the fatigue bending resistance of the piston rod of the hydraulic hoist, through the arrangement of the vertical impact simulation assembly and the horizontal impact simulation assembly, instant impact loads encountered by the piston rod of the hydraulic hoist in actual work, such as water flow impact and sudden blocking of a gate, can be accurately simulated; the defect that only static or stable cyclic bending loads are concerned in a traditional test is overcome, the test environment is closer to the real working state of the piston rod, meanwhile, after the test is finished, the vertical impact simulation assembly and the horizontal impact simulation assembly are matched, the piston rod clamped on the clamping base can be rapidly taken out, and the automatic material taking efficiency is high.

The invention relates to the technical field of ship hydraulic monitoring, and discloses a marine ship hydraulic oil cylinder state monitoring and sealing performance early warning system. A multi-source sensing data acquisition module of the system synchronously obtains multi-dimensional time sequence operation data of an oil cylinder through a vibration sensor, a pressure sensor and a temperature sensor; the data preprocessing fusion module is used for carrying out noise suppression, timestamp alignment and multi-modal fusion on the data to generate a standardized oil cylinder state feature sequence; the sealing characteristic depth extraction module is used for analyzing sealing cavity pressure fluctuation, piston rod displacement oscillation and sealing piece deformation trend characteristics from the characteristic sequence; the multi-scale state evaluation module is used for calculating a sealing performance degradation gradient and a dynamic operation stability coefficient according to the characteristics; and the early warning decision generation module is used for generating a sealing failure risk level and an early warning control instruction based on the calculation result. According to the system, stable operation of the oil cylinder is guaranteed, and the maintenance cost and the safety risk are reduced.

The invention discloses a drilling device and method for greenhouse steel pipe production, belongs to the technical field of steel pipe drilling, and provides the following scheme that the drilling device comprises a drilling mechanism, and a drilling auxiliary mechanism is arranged in the drilling mechanism; the drilling assembly moves downwards, a pulley moves along with the drilling assembly and extrudes an inclined plane between the pulley and a sliding rail, a first piston rod moves, an elastic supporting assembly is hydraulically driven to move, a supporting head enters a steel pipe fitting, the steel pipe fitting can be limited by the supporting head, and meanwhile an inner cavity of the steel pipe fitting is full of the supporting head; secondly, the elastic supporting assembly further drives the toothed bar and the clamping assembly to conduct transmission, so that the clamping assembly clamps and fixes the steel pipe, then extrusion movement between a pulley and a sliding rail is adopted, acting force can be converted through hydraulic pressure, and therefore the steel pipe can be clamped and fixed; and the toothed bar smoothly drives the clamping assembly to complete automatic positioning of the steel pipe fitting, so that the purpose of efficient operation is achieved.

The invention relates to the technical field of cable bridges, and discloses a cable bridge with expansion joints, which comprises two cable bridge main bodies, expansion joint main bodies are slidably connected to the outer walls of the two cable bridge main bodies, and three air pressure sleeves are fixedly connected to the tops of the expansion joint main bodies. First air pressure cavities are formed in the inner walls of the three air pressure sleeves correspondingly, air in the first air pressure cavities and the second air pressure cavities is extruded by the extrusion assembly under the influence of the weight of the cable, so that air at the top and the bottom of a piston rod is in a high-pressure state, and when the cable at the main body part of the expansion joint vibrates, generated vibration is transmitted to a supporting plate; by means of compressibility of high-pressure gas on the two sides of the piston rod, vibration generated by the cable is absorbed, the vibration amplitude of the cable is reduced, and the situation that flexible connection between the expansion joint body and the cable bridge body easily causes increase of the vibration amplitude of the cable at the position, large pulling force is applied to the cable at the position, and the cable is easily damaged is effectively prevented.

The invention relates to the technical field of medium phase state determination, in particular to a PVT analyzer and method suitable for multi-component fluid medium phase state determination, and the PVT analyzer comprises a determination assembly, a test cylinder, a balance cylinder, a pressurization cylinder, a gas distribution pipeline, a first driving mechanism and a second driving mechanism. The structure is reasonable and compact, combination of gas with various components can be achieved through the multiple gas cylinders and the gas distribution pipeline, mixing of the gas according to the set ratio can be achieved by adjusting the gas distribution valve, the multiple gas cylinders can inject the gas into a rodless cavity of the pressurization air cylinder through the gas distribution valve and the gas distribution pipeline, and the gas injection efficiency is improved. The second driving mechanism drives the piston rod of the pressurizing air cylinder to continuously input gas in the rodless cavity of the pressurizing air cylinder into the rodless cavity of the balance air cylinder through the pressurizing pipeline and the one-way valve, so that the pressure of the rodless cavity of the balance air cylinder can be increased; and the precise gas distribution and gas pre-pressurization functions of multi-component gas can be realized.

The present disclosure relates to a hydraulic damper comprising a main tube, a piston assembly, a base valve assembly, and at least one hydraulic compression stop assembly cooperating with a compression valve assembly, and comprising a pin disposed slidably within the piston rod and biased to project an activating tip towards the compression chamber. Said compression valve assembly comprises at least one deflectable or floating disc covering compression flow passages, and biased by a piston member slidable along said axis and normally abutting a retaining surface, and a pressure chamber having one surface defined by a surface of said piston member abutting said retaining surface, wherein said pin upon sliding inside the piston rod facilitates a flow of the working liquid from the compression chamber into said pressure chamber to increase biasing load on said at least one deflectable or floating disc.

The invention belongs to the technical field of dampers, and particularly provides a shock-absorbing damper for a high-rise building, which comprises supports fixedly mounted on an upper boss and a lower boss, a damper body is hinged between the two supports, a spiral pipe is arranged on the outer side of the damper body, one support is connected with a sleeve, and the other support is connected with a spring. An air outlet one-way valve and an air inlet one-way valve are arranged on the sleeve, the air outlet one-way valve is connected with a pressurizing box through a hose, a conveying pipe is arranged in the pressurizing box, and the conveying pipe is communicated with an inlet of the spiral pipe through a hose. In the reciprocating motion process of the damper body, the sleeve and the inflating piston rod are matched to pressurize the pressurizing box, cooling liquid in the pressurizing box is pressed into the spiral pipe, heat of the damper body is taken away, the temperature of the damper body is kept within a proper range, and the situation that the energy dissipation capacity of the damper body is affected by too high temperature is avoided; the problem that in the prior art, the energy dissipation capacity of a damper is weakened due to high temperature is solved.

The invention relates to automobile part testing, and relates to the technical field of an automobile door limiter durability testing device, and the device comprises an adjusting mechanism which comprises a first motor, a first rotating disc, a first sliding groove, a threaded rod, a first piston rod, a first sliding block, a second rotating disc, a second sliding groove and a sliding rod. Through cooperation of structures such as the second rotating disc and the arc-shaped plate, simulation testing of the vehicle door limiter is facilitated, the first motor is started to enable the second rotating disc to rotate continuously through transmission, the arc-shaped plate drives the cantilever to swing in a reciprocating mode, and the state of the limiter during door opening and closing is simulated; the durability cycle test, the motion precision verification and the instantaneous impact load evaluation of the vehicle door limiter are realized, the test automation degree and the simulation precision are improved, the negative pressure generates variable damping force, simulates air resistance, spring pre-tightening force and door closing impact, the durability of the limiter under real stress is tested, and the test effect of the device is improved.

The invention discloses a modularized replaceable self-resetting energy consumption type bridge pier anti-collision system, and belongs to the technical field of bridge engineering structure safety. The system includes an annular rubber pad, an annularly disposed damper module, and a shape memory alloy (SMA) tow. The damper module comprises a cylinder body, high-viscosity fluid, a reset spring, a piston and a force transmission plate. The cylinder body is fixed to the pier in a surrounding mode through bolts and rubber pads, the inner wall of the cylinder body is connected with the piston through a reset spring, the piston rod end is hinged to the force transmission plates, and the SMA wire bundles are connected with the force transmission plates. When an external impact load acts on the force transmission plate, the fluid damper provides viscous energy consumption, and the SMA wire bundle, the spring and the rubber pad provide deformation energy consumption; after the collision is finished, the system can be reset to the initial position under the synergistic effect of the SMA wire bundle, the spring and the rubber pad. By means of the modular design, efficient energy consumption and self-resetting can be achieved; and meanwhile, a single damper can be quickly replaced after being damaged, so that the maintenance efficiency and the system recoverability are greatly improved.

The invention relates to the technical field of structural engineering shock isolation, in particular to a quasi-zero stiffness shock isolation device based on hydraulic negative stiffness and a design method thereof. A quasi-zero stiffness shock isolation device based on hydraulic negative stiffness comprises a vertical bearing unit which comprises at least one vertical spring, and the two ends of the vertical spring are connected to the top face of a lower connecting plate and the bottom face of an upper connecting plate respectively; the negative stiffness unit comprises a hydraulic oil cylinder and a piston rod, the piston rod extends into the hydraulic oil cylinder, and the hydraulic oil cylinder and the piston rod are hinged to the lower connecting plate and the upper connecting plate respectively, or the hydraulic oil cylinder and the piston rod are hinged to the upper connecting plate and the lower connecting plate respectively; the distance between the upper connecting plate and the lower connecting plate is increased or decreased to drive the length of the piston rod extending into the hydraulic oil cylinder to change so as to provide negative stiffness. The problems that in the prior art, when a nonlinear vibration isolation system provides negative stiffness in a metal horizontal spring compensation mode, a quasi-zero stiffness working zone is narrow, the bearing capacity is low, and the requirement for installation precision is high are solved.

The invention discloses a double-acting integrated hydraulic nut and a hydraulic nut system. The double-acting integrated hydraulic nut comprises a cylinder body, a piston, a cylinder cover, a locking nut, an outer hexagon head bolt and a locking sleeve. A mounting plane attached to a workpiece is arranged at the bottom of the cylinder body, and the piston is arranged in an inner cavity of the cylinder body in an axial sliding mode. The outer hexagonal head bolt sequentially penetrates through the axial through hole of the piston and the bottom of the cylinder body, and the threaded end of the outer hexagonal head bolt is meshed with a workpiece in a threaded mode. The cylinder cover is arranged at the top of the cylinder body; the locking nut is in threaded connection with the piston rod and is in contact with the top surface of the cylinder cover; a pressurizing oil port connected with a hydraulic pump station is formed in the side wall of the cylinder body. The hexagonal head of the outer hexagonal head bolt is sleeved with the locking sleeve which is in driving connection with the electric wrench. Due to the fact that the bearing seat bolts are compact in layout and large in bolt pre-tightening force requirement, the experiment platform can be rapidly mounted and dismounted, and working time and cost are greatly reduced.

The invention discloses a hydraulic static automatic pile driver and aims to provide a hydraulic static automatic pile driver which is good in structural stability and capable of effectively solving the problem that a piston rod of a pile-embracing oil cylinder in the prior art is prone to distortion and deformation. The hydraulic static force automatic pile pressing machine can effectively solve the problem that in the pile pressing process, due to the fact that the holding force is insufficient, a pressed pile slips. The device comprises a reaction frame, a hydraulic jack and a pile embracing mechanism, the pile embracing mechanism comprises a pile embracing taper sleeve, an inner hole of the pile embracing taper sleeve is a taper hole, the hydraulic jack drives the pile embracing taper sleeve to ascend and descend, and the lower end of the pile embracing taper sleeve is connected with a bottom cover; the plurality of enclasping cone cores are arranged in the cone holes; the hydraulic elements are in one-to-one correspondence with the enclasping cone cores and comprise vertical piston cavities arranged in the corresponding enclasping cone cores; the locking piston is arranged in the vertical piston cavity and divides the vertical piston cavity into an upper cavity and a lower cavity, the lower end of the locking piston is connected with a piston rod, and the lower end of the piston rod can be connected to the bottom cover in a manner of moving in the radial direction of the conical hole.

The utility model discloses a brake device for a tensioning oil cylinder, and belongs to the technical field of brake equipment. The brake device comprises a cylinder body, a piston, a brake ball, a brake cylinder and an elastic piece, a piston rod penetrates through the cylinder; the piston, the brake cylinder and the elastic piece are all arranged in the cylinder body, the bottom of the elastic piece is connected with the cylinder body, the brake cylinder is arranged above the elastic piece, and the piston is arranged above the brake cylinder; the brake ball can abut against the inner wall of the brake cylinder and the outer wall of the piston rod. A sealing cavity is formed between the cylinder body and the piston; and an oil inlet nozzle communicated with the sealing cavity is arranged on the cylinder wall of the cylinder body. The brake device opens the brake by using the pressure of hydraulic oil and holds the brake by using the restoring force of the elastic piece, so that the stability of the telescopic state of the piston rod is improved; and the brake opening or contracting time can be flexibly adjusted according to the change speed of the oil pressure. The utility model belongs to a normally closed brake structure, and meets the mechanical safety performance requirements of products.

The invention relates to a stroke-sectioned adjustable variable-damping inflatable hydraulic multi-damping device, and belongs to the technical field of vibration control. Comprising a roll shaft support assembly, a working cylinder assembly, a spring damping assembly and a piston mechanism assembly. The working cylinder assembly is mainly composed of a connecting pull ring, a main liquid storage cylinder, a limiting device, tightness adjusting threads, a piston rod connecting position, an auxiliary liquid storage cylinder and an air storage cylinder. The spring damping assembly is mainly composed of an adjusting spinning roller, a damping spring, a spinning roller damping gasket and a spring damping gasket. The piston mechanism assembly is composed of a piston rod and driving pistons on the two sides. The roller shaft support assembly is composed of a roller shaft fixing support and a pin. Through mechanism linkage of the liquid storage cylinder and the air storage cylinder, the inflatable hydraulic damping device is formed, and the purposes of damping changing and vibration reduction are achieved. The shock resistance and the transmission efficiency of a vibration reduction system can be improved, the energy consumption effect, the structural rigidity and the stability are enhanced, and the advantages of being simple in structure, convenient to implement and the like are achieved.

A water hydraulic cylinder impact leakage detection test bench based on helium detection, the test bench comprising a test bench body, a water hydraulic cylinder (12), a helium cylinder (14), a sealed container (16) and an impact device, wherein the water hydraulic cylinder (12) is detachably mounted on the test bench body; an outlet end of the helium cylinder (14) is in communication with a rodless cavity of the water hydraulic cylinder (12), and a pressure-reducing valve (13) is mounted between the helium cylinder (14) and the water hydraulic cylinder (12); the sealed container (16) is detachably mounted in a rod cavity of the water hydraulic cylinder (12), and a helium mass spectrometer leak detector (15) is mounted on the sealed container (16); and the impact device is fixedly mounted on the test bench body, is connected to a piston rod of the water hydraulic cylinder (12), and is configured to provide impact power for the water hydraulic cylinder (12). The test bench uses an accumulator (6) as a pressure power source, which can provide rapid, stable and high-flow oil, thereby solving the problem of the pressure and flow of ordinary hydraulic pumps failing to meet test requirements; and compared with traditional impact generation by using hammer dropping, the test bench can precisely control the magnitude of the generated impact by means of the pressure of the accumulator (6), and is safe and reliable.

The invention discloses a two-chuck zero-tailing pipe cutting machine, and relates to the technical field of metal pipe machining equipment, the two-chuck zero-tailing pipe cutting machine comprises a cutting workbench, a clamping device and a feeding chuck, the clamping device is arranged on the cutting workbench, the clamping device comprises a working chuck, a first fixing plate and a second fixing plate, the working chuck is in bolt connection with the first fixing plate, and the first fixing plate is in bolt connection with the second fixing plate; a first sliding plate is in bolted connection with one side of the top of the first fixing plate, a visual sensor is fixed to the middle of the top of the first fixing plate, a first pushing block is slidably connected to the top of the working chuck, a rack is fixed to one side of the first pushing block, and the two sides of the first pushing block are slidably connected with the first sliding plate and the first fixing plate correspondingly. A first clamping jaw is connected to the top of the first pushing block through a bolt, a protection block is fixedly connected to the top of the first clamping jaw, two first air cylinders are arranged in the protection block, a piston rod is arranged in each first air cylinder, and a pressurizing clamping jaw is fixed to the top of each piston rod.

The utility model relates to the field of surveying and mapping equipment, in particular to a coal mine surveying and mapping marker post device which comprises an outer marker post, an inner marker post arranged in the outer marker post, a fixing mechanism used for inserting the outer marker post on the ground and a cleaning mechanism used for cleaning the inner marker post. The connecting rod is turned over through movement of the movable frame to move the inserting plate in the direction away from the outer marker post, then the fixing cone is separated from locking and stretches out of the outer marker post, then the inserting plate is inserted again to lock the fixing cone and insert the fixing cone into the ground, and therefore the fixing cone can be prevented from scratching a carrying person in the marker post carrying process; dust attached to the inner marker post is scraped, swept and cleaned through the scraper, then the marker post pushes the piston rod to move towards the air replenishing cylinder to blow air into the sweeping cover through the air guide pipe, and the dust attached to the inner marker post is swept and cleaned through the sweeping cover. Therefore, the situation that dust enters the outer marker post and consequently the inner marker post is difficult to pull out is avoided.

The invention discloses a piston type hydrogen compressor cylinder body, a cylinder body assembly and a hydrogen compressor, and relates to the technical field of hydrogen compressors, the cylinder body assembly and the hydrogen compressor both comprise the cylinder body, the cylinder body comprises a cylinder barrel, the cylinder barrel is provided with a cylinder cover and a piston rod seat, and a cylinder sleeve is lined in the cylinder barrel; the inner end of the cylinder cover extends into the cylinder sleeve and provides radial support for the cylinder sleeve, one end of the cylinder sleeve is supported on the piston rod seat, and the other end of the cylinder sleeve is provided with a sealing assembly. The sealing assembly comprises a main sealing ring and a spring which are arranged in a cavity gap between the cylinder barrel and the cylinder cover, the main sealing ring serves as an axial sealing piece in the cavity gap and is attached to the end of the cylinder sleeve, and the spring is arranged on the side, away from the cylinder sleeve, of the main sealing ring and serves as an elastic supporting structure for supporting the main sealing ring. The direction of supporting force of the spring to the main sealing ring is in the axis direction of the cylinder barrel. The structural design adopted by the scheme is beneficial to guaranteeing the reliability of the hydrogen compressor.

The invention relates to the technical field of sampling, in particular to an automatic sampler for chemical detection, which comprises a mounting plate and the like, the mounting plate is connected with a sampling box through a lifting assembly, a sampling opening is circumferentially formed in the sampling box, a blocking assembly used for blocking the sampling opening is arranged on the outer side wall of the sampling box, a sampling container is fixedly connected to the sampling opening in the sampling box, and a piston plate is slidably connected to the end, away from the sampling opening, in the sampling container in a sealed mode; a piston rod is fixedly connected to the side face, away from the sampling opening, of the piston plate and driven by a first driving assembly to slide. The device is provided with components such as the piston plate, cleaning is carried out in the moving process of the piston plate, and then cleaning work can be carried out while sampling liquid is pushed out by the piston plate, so that the next sampling time can be shortened, and the sampling efficiency is improved.