635 results about "Pressure - action" patented technology

The invention provides an air tightness detection device of a pressure balance type plug valve, and relates to the technical field of valve air tightness detection. An air tightness detection device of a pressure balance type plug valve comprises a water pool, an adjusting mechanism, two clamping mechanisms and an end sealing mechanism, the end sealing mechanism comprises two groups of positioning assemblies and two groups of sealing assemblies, and the positioning assemblies and the sealing assemblies are communicated and used for enabling the sealing assemblies to generate axial displacement. The sealing assembly is coaxially arranged in multiple layers, the structures of all the layers of the sealing assembly are the same, the sealing assembly is used for being inserted into an inlet and an outlet of a plug valve to be detected, and by means of the multi-layer design of the sealing assembly and the design that the positioning assembly enables each layer of the sealing assembly to generate independent axial displacement, the plug valve to be detected can be detected. The sealing assembly is adapted to plug valves to be detected with different calibers; the sealing assembly has the action of expansion under the action of air source pressure, so that the part inserted into the plug valve to be detected is in sealed connection with the plug valve, and the sealing performance is ensured.

The invention provides a metal part assembling tool and method, and relates to the technical field of bearing press fitting, and the assembling tool comprises a bearing rotating pedestal, a central supporting rod shaft, a tool table, a press fitting barrel mechanism and a plurality of shaft body clamping parts. The tool table is rotatably arranged on the bearing rotating pedestal, and the periphery of the tool table is divided into a feeding area, an assembling area and a discharging area. The method comprises the steps that a shaft body part is placed in a tool step groove in a feeding area and is positioned and clamped by a shaft body clamping component; in the assembling area, the cylinder press-fitting mechanism adsorbs the bearing parts through an electromagnetic suction ring, and the center of the bearing parts is aligned with the positioning column assembly by aligning the clamping and pressing part; the press-fitting cylinder drives the press-fitting cylinder to press downwards, the pressure measuring induction block is triggered after the positioning column assembly makes contact with the shaft body part, the electromagnetic suction ring is controlled to be powered off, clamping and pressing are released, and the shaft body part is automatically sleeved with the bearing part under the action of pressure. And finally, the assembly body rotates to a discharging area to complete discharging. Full-automatic, high-precision and continuous assembly of the bearing and the shaft body is achieved.

The invention relates to the technical field of oil development, in particular to a shale oil and gas fracturing sliding sleeve capable of being opened and closed repeatedly and a using method. According to the technical scheme, a central pipe fracturing liquid inlet is formed in the upper side of a central pipe, and a reversing rail is arranged on the surface of the outer wall of the middle; a sealing cylinder sleeve and a one-way circulating valve carrier are sleeved outside the central pipe, a fracturing piston, a swivel pressing cap and a reset spring are installed in an annulus, a constant-pressure opening cavity is formed in the inner wall of the fracturing piston, a swivel is installed in the swivel pressing cap, a track pin is installed in the swivel, and the position is moved along a reversing track on the surface of the outer wall of the central pipe through the track pin. The fracturing piston moves downwards to the position of the cylinder sleeve fracturing liquid outlet under the action of pressure, the fracturing function is started, fracturing liquid is sprayed out along the cylinder sleeve fracturing liquid outlet to enter a target fracturing layer, fracturing construction of a plurality of fracturing layers can be achieved through multiple times of fracturing liquid injection and injection stopping, the fracturing sliding sleeve can be repeatedly opened and closed, and the fracturing construction efficiency is improved. And fracturing construction requirements of shale oil and gas with different layers can be met.

The invention discloses an engineering geology grouting reinforcement device, and relates to the field of geology grouting reinforcement, the engineering geology grouting reinforcement device comprises a mounting rack, the mounting rack is fixedly connected with a first telescopic driving part, the output end of the first telescopic driving part is fixedly connected with a mounting plate, and the mounting plate is fixedly connected with a grouting pipe. The grouting pipe is used for pressurizing and grouting, so that the grout enters a reinforcing gap under the action of pressure; after filling is conducted for a period of time, the injection-compression pipe moves downwards, the sealing plate blocks the grouting opening under the action of the spring to prevent grout from flowing back, meanwhile, the injection-compression pipe moves downwards to extrude the grout, the extrusion force is further increased, and geological gaps are filled with the grout more sufficiently. Through the reciprocating operation, the geological reinforcement position can be fully grouted, the stability and strength of the geological structure are effectively enhanced, the quality and reliability of grouting reinforcement are greatly improved, and the reinforcement requirement under the complex geological condition is met.

The invention relates to the technical field of cross shafts, and discloses an efficient lubricating needle bearing cross shaft which comprises a cross center part, a first oil injection assembly is arranged on the cross center part, a second oil injection assembly is arranged in the cross center part, and the first oil injection assembly comprises an oil injection nozzle. A first oil cavity is formed in the cross-shaped center part, and a first oil injection groove is formed in the cross-shaped center part. According to the efficient lubricating needle bearing cross shaft, a grease gun is used, an oil outlet of the grease gun is tightly pressed on an oil injection nozzle, it is ensured that lubricating oil enters a first oil cavity through the oil injection nozzle under the pressure effect, and a first sealing plate and a first spring move downwards to the position below a communicating hole channel under the pressure effect; and meanwhile, after the second oil cavity is filled with the lubricating oil, the first oil cavity is slowly filled with the lubricating oil, the lubricating oil flows out of the first oil injection groove, and primary oil injection can be achieved.

The utility model relates to the technical field of fire fighting equipment, and discloses a fire hose quick connecting and sealing device which comprises a connecting male head, the outer side of the connecting male head is sleeved with a connecting female head, the outer side of the connecting female head is fixedly sleeved with a fixing seat, a cavity is formed in the fixing seat, and a piston mechanism is arranged in the cavity; a sealing seat is arranged on the inner wall of the female connector, a mounting groove is formed in the inner wall of the sealing seat, a sealing mechanism is arranged in the mounting groove, a groove is formed in the outer side of the male connector, and a limiting mechanism is arranged between the groove and the female connector. Compared with the prior art, the fire hose has the following advantages and effects that by arranging the sealing mechanism, a tiny gap between the connecting male head and the connecting female head can be effectively filled through the expanded sealing air bag, the purpose of preventing fire fighting water from leaking from the connecting part under the pressure effect is achieved, and therefore the sealing performance and reliability of the fire hose during water passing are guaranteed, and the service life of the fire hose is prolonged. And a powerful guarantee is provided for smooth fire-fighting operation.

The invention provides an internal flow field balancing device for a high-temperature and high-pressure closed container. Comprising a pulley, a transmission mechanism, a clutch, a turbulent flow mechanism, a frequency modulation motor, a sealed cabin, a pressure maintaining cabin and a pressurizing device, a rotating cage is arranged on the pulley and is driven to rotate through a rotating mechanism; a tray is hung on the rotating cage, and an accommodating object is accommodated on the tray; the transmission mechanism is arranged at the closed end of the tank body; one end of the clutch is connected with the transmission mechanism; the turbulence mechanism is provided with a transmission shaft, blades, a driving gear and a sealing ring are arranged at the extension end of the transmission shaft, the blades are used for adjusting airflow distribution in the tank body, and the driving gear is connected with the input end of the transmission mechanism and used for driving the transmission mechanism; the sealed cabin is arranged outside the sealing head at the closed end of the tank body; the pressure maintaining cabin is arranged on the outer side of the sealed cabin, and a sealing ring is arranged in an inner cavity, adjacent to the pressure maintaining cabin, of the sealed cabin. The pressurizing device is connected with the pressure maintaining cabin, and pressure of the pressurizing device acts on the outer side of the sealing ring to maintain pressure balance on the two sides of the sealing ring.

The utility model discloses a reverse osmosis membrane shell sealing structure. The reverse osmosis membrane shell sealing structure comprises a membrane shell and an end cover assembly arranged in the inner space of the membrane shell, the end cover assembly comprises an end cover bearing plate, an end cover sealing plate and a U-shaped end cover sealing ring; the end cover bearing plate is connected with the membrane shell, the end cover sealing plate is arranged on one side of the end cover bearing plate and connected with the membrane shell, and the middle of the end cover sealing plate penetrates through the end cover bearing plate; one end of the U-shaped end cover sealing ring is connected with one end of the end cover sealing plate and located on the inner wall of the membrane shell, and a U-shaped opening faces the interior of the membrane shell; the U-shaped end cover sealing ring is tightly attached to the inner wall of the membrane shell and the end cover sealing plate under the action of pressure to form self-pressure sealing. According to the device, the self-pressure sealing function of the U-shaped end cover sealing ring is utilized, so that the sealing effect of the reverse osmosis membrane shell during high-pressure operation is improved; and when the equipment is stopped, the pressure of the internal medium is zero, and the pressure between the U-shaped sealing ring and the end cover sealing plate only comes from the natural tension of the U-shaped sealing ring, so that the U-shaped sealing ring is very easy to disassemble.

The utility model relates to the technical field of piston rods, in particular to an automobile piston rod strength detection device which comprises a workbench and is characterized in that a machining groove is formed in the workbench, a clamp assembly is rotationally connected in the machining groove, a material box is arranged below the machining groove in a drawable mode, supporting columns are distributed on the periphery of the material box, and the supporting columns are arranged on the workbench. Uniformly distributed processing columns are fixedly connected to the upper end of the workbench, a top plate is fixedly connected to the upper ends of the processing columns, and a testing assembly is fixedly connected to the top plate. According to the utility model, when the piston rod is tested by arranging the spring, the pressing block can apply pressure on the spring, so that the pressure of the contact surface of the pressing block is reduced, the abrasion of the pressing block is relieved, the service life can be prolonged, and the pressure on the spring is metered by arranging the pressure gauge, so that the test is carried out objectively.

The invention relates to the field of perforating machines, in particular to an adjustable clamping type automobile part perforating machine. Comprising a punching assembly, and a clamping adjusting assembly is installed on the edge of the top of the punching assembly; when chippings directly flow into the collecting pipe and the position of the punching structure deviates, the output end of the punching structure can directly output the chippings into a cavity filled with frosted sand and stir the chippings with the frosted sand, sound generated by the punching structure drives a noise sensor to send an instruction to a water injection tank, and the water injection tank starts to inject water into the cavity; when the output end of the punching structure and frosted sand filled with water are stirred, passive grinding can be conducted, and the subsequent drilling precision is improved; when the punching machine works, the second sleeving circular ring acts pressure on the first sleeving circular ring, the first sleeving circular ring extrudes a first compression spring to buffer, a first pressure sensor monitors numerical values, and the working effect of the punching machine is improved while the part protection effect is improved.

The invention discloses a high-sealing ball valve with a leakage detection function, and relates to the technical field of valves, the high-sealing ball valve comprises a bottom shaft, a valve body structure, a filler box, a support, a filler gland, a valve cover and an air cylinder, the valve body structure adopts a leakage detection technology, when a leaked medium is captured, the leaked medium can be timely introduced into the detection structure, and the leakage detection function is achieved. Leaked media can be detected in the early stage of leakage, medium loss caused by further expansion of the leakage is prevented, meanwhile, an automatic leakage repairing technology is adopted, when the detection structure detects leakage, the injection structure injects sealing grease to the sealing face between the valve seat and the ball body in time, the sealing grease evenly fills a leakage channel under the pressure effect, and the leakage is avoided. And the continuous leakage of the medium is blocked, temporary filling is carried out, the injection structure is reset after filling is completed, it is ensured that the normal opening and closing functions of the ball valve are not affected, and the medium loss and environmental pollution risks caused by leakage are reduced.

The invention relates to the field of intelligent sensors, and discloses a method for manufacturing a sensitive core of a six-dimensional pressure sensor of a robot based on glass micro-melting, which comprises the following steps of: calculating the deflection of a flat diaphragm corresponding to a glass micro-melting structure so as to analyze the structural strain characteristic of the sensitive core under the action of pressure; calculating the gas viscosity coefficient of the sensitive core body under the dynamic load condition, and calculating the pressed film damping amount of the sensitive core body; performing a temperature cycle test on the sensitive core, collecting thermal zero drift data in the test process, and analyzing the temperature drift stability of the sensitive core; carrying out calibration test on the sensitive core body to obtain non-linearity data, and evaluating the measurement precision of the sensitive core body; and performing optimization processing on the sensitive core body manufacturing process to obtain an optimization result. The manufacturing process stability of the sensitive core body of the six-dimensional pressure sensor of the robot can be improved.

The invention discloses an evaporator and power conversion equipment, and belongs to the technical field of radiators. The multiple supporting structures are connected between the first inner wall face and the second inner wall face, part of the supporting structures define a pressure relief area, the pressure relief area communicates with the evaporation cavity, and the strength of the pressure relief area is smaller than that of the area where the other supporting structures are located; the pressure relief part is arranged in the pressure relief area and is arranged close to one supporting structure which forms the pressure relief area in a surrounding mode. The geometric shape of the pressure relief area is suddenly changed at the pressure relief part through the pressure relief part, so that the edge of the part, located in the pressure relief area, of the pressure relief part generates stress concentration under the action of pressure, the yield limit or the breaking strength of a material is easily reached firstly, breakage occurs, and directional pressure relief is achieved. Due to the fact that the wall thicknesses of the shell in the corresponding pressure relief area and the non-pressure relief area are the same, the overall corrosion resistance and strength of the evaporator are improved, and the reliability of equipment is improved.

Disclosed in the present invention is a collision buffering and energy absorption device capable of being folded for storage, comprising a support structure and a collision buffering assembly; the support structure comprises a bottom plate, a top plate and support connection rods, the bottom plate and the top plate being connected to each other at each of four corners by means of one support connection rod; each support connection rod comprises an upper connection rod, a lower connection rod and revolute pairs, the axes of the revolute pairs in each support connection rod being arranged in parallel; the collision buffering assembly is mounted inside the support structure and does not interfere with the support connection rods; when the device is under pressure, the support structure is folded under the action of the pressure and, during the folding process, the collision buffering assembly is deformed by the pressure to absorb collision energy, thus achieving a buffering effect. On the basis of overcoming the defect that traditional collision buffering materials have low longitudinal rigidity and are prone to instability when a collision stroke is too long, the device of the present invention uses an airbag as a collision buffering material to effectively reduce the weight of the device, and can be folded to be stored in a storage state, thus occupying a small space in the storage state.

This utility model discloses an embedded sealing structure for a rivet nut, comprising a body, an annular groove recessed at the end of the body, an abutting part between the annular groove and the edge of the body, a guide part coaxially located in the middle of the annular groove and connected to the body, and a plurality of ribs between the outer wall of the guide part and the annular groove, the tips of the ribs facing the same direction as the guide part. The design of the tips makes it easier for the ribs to penetrate into the metal plate and penetrate deeper, allowing the rivet nut to withstand greater torque. Due to the design of the annular groove, the contact area between the abutting part and the metal plate is much smaller than that of a traditional rivet nut, but the same fastening effect can be achieved. That is, the contact area is smaller under the premise of achieving the same fastening effect. When the product is under pressure, the bottom surface of the product and the surface of the component are more likely to fit together, achieving physical sealing and reaching IP67 protection level.

The invention relates to the technical field of aluminum profile hot extrusion cooling shaping, and particularly discloses an aluminum profile hot extrusion cooling shaping device which comprises a fixing table, a lifting table is arranged at the upper end of the fixing table in a lifting mode, a mounting groove is formed in the lower end of the lifting table, a graphite disc is arranged in the mounting groove in a lifting mode, and a graphite plate is arranged in the middle of the inner bottom wall of the graphite disc. A scraping assembly is arranged on the lifting table, and a switching assembly is arranged on the fixed table. The graphite plate is fixedly placed in the graphite plate, then the graphite plate is lifted into the installation groove, the height of the lifting table is adjusted at the same time, the cambered surface of the graphite plate abuts against the aluminum profile, the graphite plate can rapidly absorb and dissipate heat of the aluminum profile, and the aluminum profile is rapidly cooled, solidified and shaped under the pressure effect. And the scraping assembly is used for scraping the cambered surface of the graphite plate to repair or adjust the cambered surface shape, and the switching assembly is used for switching different graphite plates, so that the production efficiency is improved, and different cambered surface requirements are met.

The utility model provides a crimping device, which comprises a base, a sealing cover and a pressurizing part, and is characterized in that the base is used for placing a to-be-pressed piece; the sealing cover is used for being matched with the base, so that a sealed space is formed between the sealing cover and the base during pressing; the pressurizing part is connected with the sealing cover, and the pressurizing part is used for applying pressure to the flexible medium in the sealing space, so that the to-be-pressed and attached part is pressed and attached under the pressure action of the flexible medium. The crimping device can uniformly apply pressure to each position of the to-be-pressed piece, so that the pressurizing uniformity of the to-be-pressed piece is ensured, and the pressing effect and the performance of the battery are improved.

The application discloses a kind of high-precision warping prevention clamping equipment of sheet part based on negative pressure adsorption, belong to the technical field of machine equipment.It includes adsorption platform, is provided with several adsorption holes on adsorption platform, and airflow chamber is arranged in adsorption platform;Plug is installed in adsorption hole, second filter screen is rotatably installed on plug, and torsional spring is installed in the rotary joint of second filter screen;Several adjusting frames are slidably installed on adsorption platform, several locating plates are installed on adjusting frame, threaded rod is rotatably installed on adjusting frame, and threaded rod is threadedly connected with adsorption platform.The plug is inserted into adsorption hole, and the inclined groove of guiding block can be inserted into the locating plate of adjusting frame, so that the plug is forced to drop to the limit position, the top of plug is slightly lower than the mouth part of adsorption hole, the plug is prevented from being damaged by knocking during workpiece clamping process, and the stability of plug after installation is improved when reverse pressure cleaning is prevented from being separated from adsorption hole by pressure.

The present invention relates to an air guide element (1) for movable attachment to an electrical component (2) in the region of an end face of an electric machine (4) comprising at least one stator (8), wherein the air guide element (1) comprises a rotating element (10) in the region of which a pivot point (16) of the air guide element (1) is located, as well as an impact area (12) and at least two pressure surfaces (14, 14'). The air guide element (1) guides and / or distributes a cooling airflow K over the at least two pressure surfaces (14, 14') such that the stator (8) is cooled, and when different pressures (p1, p2) act on the at least two pressure surfaces (14, 14'), the air guide element (1) rotates about the pivot point (16). The invention further relates to an air guide arrangement (100) comprising an electrical component (2) and an air guide element (1).The invention further relates to a method for cooling a stator (8) and to the use of the air guide element (1) and the air guide arrangement (100).

The utility model discloses a multi-gear adjusting intelligent panel, which relates to the technical field of intelligent panels, and comprises a panel main body and a mounting seat, a shock absorption assembly is arranged on the front surface of the mounting seat, the shock absorption assembly comprises a movable shell, a movable block, a compression spring, a damper, an extension spring and a positioning rod, the movable shell is mounted on the front surface of the mounting seat, and the movable block is mounted on the movable shell. The panel has the advantages that when external pressure acts on the panel body, the movable shell is matched with the T-shaped movable block, it is guaranteed that the movable block stably moves in the movable groove and is not prone to disengagement, the compression spring and the extension spring are matched up and down, vibration impact in the vertical direction is buffered respectively, and the panel body is not prone to disengagement. The damper is sleeved with the compression spring, vibration energy can be quickly consumed, the panel can be more quickly recovered to be stable, the positioning rod is matched with the sliding groove in the surface of the movable block, and it is ensured that the intelligent panel stably operates in various environments.

The invention relates to a white tissue exfoliation reproduction experimental method and application thereof. The method comprises the following steps: hydrotreating a bearing test piece to obtain a hydrogen-embedded test piece; fixing the test piece in a reciprocating motion device, applying pressure in the direction perpendicular to the reciprocating motion, starting the reciprocating motion device, and enabling the test piece pre-buried with hydrogen to do reciprocating motion under the action of the pressure until white tissues are peeled off. By using the method provided by the invention, the occurrence time of white tissue peeling can be greatly reduced. For example, a bearing used for new energy motor equipment and high-carbon chromium bearing steel treated by an oxidation blackening process can be simulated within about 90 hours by using the experimental method disclosed by the invention, which is equivalent to 320 hours of the traditional test, and the time of the bearing exceeds 5 years in actual use. The method provided by the invention is simple, convenient and cheap, has higher efficiency, can be used for simulating the test of white tissue peeling, and realizes the performance test of white tissue peeling and bearing detection during bearing production.

The invention discloses a control valve and a packer, and belongs to the technical field of oilfield development, the control valve comprises a pipeline assembly and a control assembly, a moving channel is formed in the pipeline assembly, and a closing position and an opening position are arranged in the axial direction of the moving channel; the control assembly comprises a sliding sleeve and an elastic piece, the sliding sleeve is in sliding connection with the moving channel, the elastic piece is arranged between the sliding sleeve and the opening position, and when external pressure is larger than internal pressure of the moving channel, the sliding sleeve moves to the opening position in the axial direction of the moving channel under the action of pressure and compresses the elastic piece, so that the control valve is opened; when the external pressure is smaller than the internal pressure of the moving channel, the elastic piece recovers deformation and drives the sliding sleeve to move to the closing position in the axial direction of the moving channel, and therefore the control valve is closed. The packer is provided with the control valve. Through the synergistic effect of the sliding sleeve and the elastic piece, the control valve can be opened and closed repeatedly, the operation efficiency is improved, and the use cost is reduced.

The invention relates to the technical field of underground differential tools, in particular to an underground differential device. The underground differential device comprises a fixed part and an action part, wherein the fixed part consists of an upper joint, an inner pipe and an outer cylinder which are concentric; the action part consists of a differential rod and a piston; the differential rod is located between the outer cylinder and the inner pipe, underground fluid flows into the space between the outer cylinder and the differential rod, and the differential rod can move along the inner pipe under the pressure effect of the underground fluid; the inner pipe is provided with a starting mechanism for fixing the position of the differential rod, and a limiting mechanism for limiting the stroke of the differential rod is arranged between the inner pipe and the differential rod. According to the underground differential device provided by the invention, the differential rod is controlled to move up and down to realize the differential action through the pressure acting on the differential rod by the underground fluid between the outer cylinder and the differential rod, and a pump body on the ground is not required to provide power for the differential device to perform the differential action, so that the ground safety and the success rate of the differential action are improved.

The utility model discloses a dismounting device for a large-diameter bolt in a narrow space, which is characterized in that in a bolt push-out assembly, a pressure transmission module is fixedly arranged on the inner side end face of one side plate of a bow-shaped clamp, and the other side plate of the bow-shaped clamp is in threaded connection with a hexagon bolt through a threaded hole in the middle; the groove-shaped cavity of the cushion block is arranged on the bolt head of the product bolt in a sleeving mode, the threaded end of the product bolt makes contact with the sensing end of the pressure transmission module, the hexagon bolt is screwed to enable pressure to act on the top end of the cushion block, counter-acting force acts on the threaded end of the product bolt through the pressure transmission module, and the product bolt is pushed out. The bolt head generates the displacement of being pushed out in the groove-shaped cavity of the cushion block; the bolt pulling-out assembly is arranged on the bolt head of the product bolt in a sleeving mode through the concave clamping groove in the end, and pulling-out force is applied to the product bolt through the concave clamping groove so that the product bolt can be pulled out of the machine body structure. The utility model solves the problem that the surface and the hole wall of the bolt are damaged due to local deformation of the butt-joint bolt easily caused by the traditional dismounting mode of the bolt.

The anti-explosion pressure release valve comprises a mounting seat, a valve cover, an elastic mechanism and an active opening mechanism, and the mounting seat is provided with an exhaust port; the valve cover is movably arranged on the mounting seat and can close or open the exhaust port; the elastic mechanism is connected with the valve cover and the mounting seat and can apply elastic force to the valve cover to enable the valve cover to reset to the position for closing the exhaust port; the active opening mechanism is detachably installed on the installation base and can push the valve deck to move to the position where the exhaust port is opened, when the system pressure is abnormal, the pressure acts on the valve deck and overcomes the elastic force of the elastic mechanism, the exhaust port is opened, the passive pressure relief function is achieved, and safety is improved. And active pressure relief or air exchange is achieved, different use requirements are met, and the application range is wider.

The utility model discloses a fixing device for a plugging air bag, and relates to the technical field of plugging fixing structures, the fixing device comprises a support assembly, a buckle assembly and a supporting assembly, the buckle assembly is installed at the top of the support assembly, and the supporting assembly is installed at the bottom of the support assembly; wherein the buckle assembly comprises a clamping ring, a clamping groove and an elastic piece, and the elastic piece comprises a pressing block, a push rod and a handle; the clamping ring is clamped at the upper end of the telescopic piece; the clamping ring is connected with the clamping groove through the connecting block; a pressing block is mounted at the bottom of the other end of the push rod; the push rod is installed on the clamping groove, and the pressing block is located in the clamping groove. The air bag can be prevented from slipping under the action of upstream pressure and the like.

The utility model discloses a special grinding wheel for thinning the back of a silicon wafer. The special grinding wheel comprises a grinding wheel device body base and a placement workbench arranged at the upper end of the grinding wheel device body base. A middle connecting adsorption disc is arranged in the middle of the placing adsorption pad, a built-in telescopic connecting body is arranged in the middle of the outer connecting column body, a stirring adjusting column is connected with the built-in telescopic connecting body through a rotating shaft, and the stirring adjusting column is rotated so that the built-in telescopic connecting body can be stretched to exhaust air in the position of the middle connecting adsorption disc; the silicon wafer placed on the placing adsorption pad can be only attached to the placing adsorption pad under the action of pressure after being adsorbed, the silicon wafer can be stably limited in an adsorption mode after being improved, friction can be increased through the placing adsorption pad, position deviation of the silicon wafer is effectively avoided, and the service life of the silicon wafer is prolonged. And the operation is simple and quick, so that the use practicability of the special grinding wheel for thinning the back of the silicon wafer can be effectively improved.

The application relates to the technical field of valve driving, and discloses a high-speed driving device and a method thereof, which comprises a cylinder body, a piston is slidably connected to the inner wall of the cylinder body, an energy storage cavity and an annular cavity are arranged at the upper part of the inner wall of the cylinder body, a buffer cavity is arranged at the lower part of the inner wall of the cylinder body, the annular cavity is communicated with the buffer cavity, the energy storage cavity, the annular cavity and the buffer cavity are all connected with an external pressure source, the energy storage cavity is connected with a first controller and a first valve, the first controller is used for controlling the opening and closing of the first valve, the annular cavity and the buffer cavity are connected with a second controller and a second valve, and the second controller is used for controlling the opening and closing of the second valve. The pressure medium of the energy storage cavity is fed in advance, when the pressure medium in the buffer cavity flows into the annular cavity, the piston can respond instantaneously, and the pressure medium does not need to be injected, under the action of the medium pressure of the energy storage cavity and the medium pressure of the annular cavity, the piston is driven downward instantaneously, and millisecond-level response of the piston is realized.

The utility model belongs to the technical field of constructional engineering, and particularly discloses a constructional engineering formwork settlement monitoring device which comprises a bottom plate, two oil storage boxes are fixedly connected to the upper surface of the bottom plate, a partition plate is fixedly connected to the interior of each oil storage box, and a flow guide column is fixedly connected to the middle of each partition plate. The space at the top of the sliding cylinder is in a high-pressure state under the action of upward movement of the piston when the template sinks downwards, the shifting piece at the top of the piston is extruded to be tightly attached to the top sealing groove, sealing of the top of the piston is achieved, and lubricating oil originally located at the top of the sliding cylinder is extruded to pass through the one-way valve under the action of pressure. Lubricating oil flows into the flow guide pipe and finally uniformly flows to the surface of the resistor to lubricate the resistor, and the lubricating oil forms a layer of uniform and stable oil film on the surface of the resistor, so that the friction coefficient of the resistor in the working process is effectively reduced, the abrasion of parts is reduced, and the service life of the device is prolonged.

The utility model relates to the field of sealing, in particular to a sealing ring for a large pressure vessel, which comprises a main ring, grooves formed in two sides of the main ring, V-shaped springs clamped in the grooves, and a supporting piece arranged on one side, far away from the main ring, of each V-shaped spring, and the supporting piece is provided with two supporting surfaces attached to the V-shaped springs. Due to the fact that a sealing ring in a large pressure container can be subjected to pressure for a long time, after a large-size V-shaped spring is used in a high-pressure environment for a long time, the V-shaped spring deforms and lacks elastic force due to metal fatigue, and the sealing performance of the sealing ring is affected. Through the arrangement of the supporting piece, the two supporting faces of the supporting piece are attached to the V-shaped spring, the two supporting faces play a role in supporting the V-shaped spring, the V-shaped spring cannot deform due to the fact that the V-shaped spring is used in a high-pressure environment for a long time, and the effect of prolonging the service life of the V-shaped spring is achieved.