490 results about "Pressure transmission" patented technology

The invention discloses a temperature and pressure sensor for a new energy automobile, and belongs to the technical field of sensor equipment, the temperature and pressure sensor comprises a plug assembly, a shell and a protective sleeve, a support seat, a circuit board, a temperature sensing probe and a pressure sensing element are arranged in the shell, the protective sleeve is arranged at the lower waist part of the support seat, and the temperature sensing probe is located in the protective sleeve and is in electric signal connection with the circuit board; a square groove for containing the pressure sensing element and the circuit board is formed in the top of the support base, the pressure sensing element is arranged at the bottom of the circuit board and is in electric signal connection with the circuit board, and a pressure transmission channel is further arranged in the shell. The pressure transmission channel comprises a gap part defined by a protective sleeve and a shell and a special-shaped channel formed in the support base, a circular pressure groove is formed in the square groove, the circular pressure groove is matched with the pressure sensing element to form a pressure cavity which is eccentrically designed relative to the shell in the axial direction, and the special-shaped channel is formed in a medium leading-in area. Therefore, the medium entering surface area can be increased through the eccentric design, and the response speed of medium pressure measurement is ensured.

The invention discloses an anti-pulling protection mechanism for a charging pile, and belongs to the technical field of charging equipment, and the anti-pulling protection mechanism comprises the charging pile which is used for providing electric quantity; the charging head is connected with the charging pile through a charging wire and used for charging the vehicle; the separating mechanism comprises a steel wire rope arranged on the charging head and is used for separating the charging head from a charging hole in the vehicle; the separating mechanism is further provided with a releasing assembly which comprises a pressing rod arranged on the charging head handle and a buckle component used for releasing the charging head handle. In the invention, when a user does not pull out a charging head after charging and drives a vehicle to be pulled, a steel wire rope is tensioned to trigger a separation mechanism, a hydraulic system transmits pressure to a handle buckle through an oil cavity and a sliding rod to unlock, and meanwhile, a rack I, a rack II and a circular gear are linked to push a push rod to push out the charging head, so that the charging head is separated from a charging interface; the mechanical damage caused by accidental pulling of the charging wire and the charging pile is effectively avoided, and the equipment safety is remarkably improved.

A sensor cleaning device is for a vehicle and configured for cleaning a sensor surface of a sensor. The sensor cleaning device includes: a pressurized-air inlet for receiving pressurized air, a liquid inlet for receiving liquid, a cleaning port for providing the liquid and / or the pressurized air. The sensor cleaning device has a conveyed-volume region, configured to accommodate the liquid, which is fluidically connected to the pressurized-air inlet, the liquid inlet and the cleaning port, such that the liquid is conveyed in a conveying direction to the cleaning port as a result of the pressurized air being applied to the pressurized-air inlet, wherein the conveyed-volume region is realized such that, for the purpose of conveying the liquid, the pressurized air is in contact with the liquid, in particular directly and / or in a pressure-transmitting manner realizing a phase boundary.

The invention relates to the technical field of concrete detection, in particular to a pressure test device for concrete detection, which comprises a sample carrying table, the upper part of the sample carrying table is connected with an air cylinder mounting plate through a plurality of optical shafts which are longitudinally arranged, the air cylinder mounting plate is connected with a pressurizing air cylinder, and the output end of the pressurizing air cylinder is connected with a pressing plate which is slidably mounted on the optical shafts; a pressure sensor is arranged between the pressing plate and the output end of the pressurizing cylinder; the pressing plate is connected with a cleaning mechanism for cleaning the lower surface of the pressing plate, the upper surface of the sample carrying table and the upper surface of the concrete sample placed on the sample carrying table. In the pressure test process, the cleaning mechanism can timely clean the lower surface of the pressing plate and the upper surface of the sample loading table before and after each test or in the test process, so that the lower surface of the pressing plate and the upper surface of the sample loading table can be fully and uniformly contacted with a concrete sample in a subsequent test, crushed materials are prevented from influencing pressure transmission, and the stress of the sample is more uniform; therefore, the accuracy of test results is improved.

The invention relates to the technical field of natural gas well exploitation, in particular to a water drainage, sand pumping and plug removal device for a power-free gas production pipe column and a using method. According to the technical scheme, the water inlet end of the lower portion of a nozzle is connected with a power water inlet formed in the outer wall of a pump body, a center pipe is arranged at the lower end of the nozzle, the water outlet end of the upper portion of the nozzle is communicated with a formation liquid inlet cavity, an expansion rubber barrel is arranged on the lower side of the pump body, and an upper pressure transmission hole is formed between the expansion rubber barrel and the center pipe; a slip rubber sleeve is arranged on the lower side of the pump body, a slip piece is arranged on the outer side of the slip rubber sleeve, a lower pressure transmission hole is formed between the slip rubber sleeve and the central pipe, and a formation liquid suction inlet is formed in the lower end of the pump body. A washing pipe is arranged at the bottom of the central pipe, and a sand suspending nozzle is arranged at the bottom of the washing pipe. The device has the beneficial effects that under the condition that a gas production pipe column is not moved, a continuous oil pipe is put into an inner cavity of the gas production pipe column to drive the device to pump sand, the sand pumping and plug removal requirements special for a natural gas well are met, and the well control safety and environmental protection problems of the natural gas well are avoided.

The invention discloses a self-adaptive downhole rock annular cutting groove stress unloading percussion bit and a drilling method, and belongs to the technical field of petroleum drilling engineering. The self-adaptive downhole rock annular cutting groove stress unloading percussion bit comprises a bit connector, a cutting groove unloading barrel body and a percussion bit body; the upper end of the percussion bit matrix is fixedly connected with the lower end of the bit joint; the upper end of the grooving unloading barrel matrix is in axial sliding fit with the lower end of the bit joint; a bit pressure transmission disc spring is arranged in an annular space between the bottom end face of the drill bit connector and the top end face of the annular step. A plurality of annular grooving unloading stress teeth are arranged at the lower end of the grooving unloading barrel matrix; impact crushing teeth are arranged at the lower end of the impact drill bit matrix; when the drill bit reaches the well bottom, the annular cutting groove unloading stress teeth make contact with the well bottom earlier than the impact crushing teeth. Through the structural arrangement of the drill bit, annular grooving of shaft bottom rock is achieved, shaft bottom stress is unloaded, the efficiency of impact rock breaking is improved by reducing the strength of the rock, and the drilling speed is increased.

The invention discloses a hydraulic oil cylinder with an axial supporting protection function, and belongs to the technical field of hydraulic cylinders, the hydraulic oil cylinder comprises an outer cylinder body, an oil cylinder rod and a first piston, a center oil cavity is formed in the outer cylinder body, the first piston is fixedly connected to the bottom of the oil cylinder rod, and the oil cylinder rod and the first piston are both slidably connected to the interior of the center oil cavity; a pressure buffering structure is connected into the outer cylinder body, when the oil cylinder rod bears pressure, the pressure buffering structure and the magnetic supporting structure are matched with each other to jointly share the pressure borne by the oil cylinder rod, a supporting rod in the magnetic supporting structure can transmit the pressure of the oil cylinder rod to a second piston, and therefore the oil cylinder rod is prevented from falling off. The second piston slides downwards in the storage cavity and extrudes the magnetorheological fluid, the stress of the oil cylinder rod is relieved through the buffering characteristic of the magnetorheological fluid, and therefore protection on the oil cylinder rod is effectively enhanced, and the stability and reliability of the hydraulic oil cylinder under the pressure effect are improved.

The utility model discloses a clutch booster with a hydraulic damping valve, which comprises a clutch booster assembly, the clutch booster assembly comprises a hydraulic cylinder, and the hydraulic cylinder is connected with the hydraulic damping valve which is used for damping hydraulic pressure sudden change or pressure wave crest in the hydraulic cylinder. The hydraulic cylinder is connected with the hydraulic damping valve, hydraulic oil pressure generated in sudden change or pressure wave crests, especially instantly generated by the sudden change or pressure wave crests, is transmitted to the hydraulic damping valve, sudden change pressure change in the hydraulic cavity is balanced through the hydraulic damping valve, and pressure generated after sudden change or wave crests is reduced and directly transmitted to the clutch. The hydraulic pressure in the hydraulic cylinder is stably output, the influence of sudden pressure change (especially increase) and overlarge pressure wave crest generated in the hydraulic cavity on product control hydraulic stability is avoided, and then the influence of unstable product output pressure is avoided.

An electric hydraulic brake includes: wheel brakes configured to braking force to wheels of a vehicle; a reservoir storing brake oil; a master cylinder connected to the reservoir, and operated in conjunction with a main brake motor to generate pressure of the brake oil; a first controller configured to control the main brake motor; a hydraulic controller including a pump configured to form pressure of the brake oil in conjunction with an auxiliary brake motor, and a hydraulic block configured to selectively transmit the pressure of the brake oil formed in the master cylinder or the pump to the wheel brakes; and a second controller configured to control the auxiliary brake motor when the master cylinder or the first controller malfunctions. The hydraulic controller is provided with an auxiliary flow path to transmit the brake oil from the reservoir to the pump directly through the auxiliary flow path.

The utility model discloses a pressure balance fluid control valve which comprises a valve body provided with an input interface and an output interface, and the valve body is connected with an external pipeline through the input interface and the output interface; the valve element assembly is arranged in the valve body and used for controlling connection and disconnection between the input connector and the output connector. The pressure conduction assembly is connected with the valve element assembly so as to conduct pressure borne by the side, opposite to the fluid, of the valve element assembly to the other side of the valve element assembly. Pressure balance on the two sides of the valve element is achieved through pressure conduction, operating force is reduced, abrasion is reduced, the stability of the valve is improved, the service life of the valve is prolonged, and the overall reliability is enhanced.

The invention relates to the technical field of manipulators, in particular to a license plate carrying manipulator which is used for solving the problem that no follow-up remedial measures exist after a suction cup is separated from a license plate when an existing suction cup manipulator grabs the license plate. The mechanical arm comprises an arm body, the arm body comprises a mounting plate, the mounting plate is connected with a grabbing mechanism, the grabbing mechanism comprises four pressure transmitting pipes vertically sliding at the four corners of the mounting plate, the bottoms of the pressure transmitting pipes are connected with corrugated pipes, and the bottom ends of the corrugated pipes communicate with suction cups; the device further comprises a detection mechanism and an auxiliary mechanism, the detection mechanism comprises a vertical rod vertically sliding in the middle of the mounting plate, and the auxiliary mechanism comprises four wedge blocks hinged to the side portion of the mounting plate; the mechanical arm can conduct automatic remedy after the suction cup is separated from the license plate, the wedge block swings the lower portion of the license plate, the license plate is pressed on the separated suction cup, and the suction cup adsorbs the license plate again.

The invention belongs to the field of hydraulic cylinder application, and provides a hydraulic cylinder automatic detection device which comprises a detection equipment support, a placement base is fixedly installed at the bottom of the detection equipment support, a placement groove is formed in the middle of the top end of the placement base, a hydraulic cylinder barrel is placed in the placement groove, and a piston rod is movably arranged at the top end of the hydraulic cylinder barrel. A supporting part is arranged on the top of the detection equipment support and located above the hydraulic cylinder barrel, a pressure detector is installed in the middle of the top end of the supporting part, the bottom end of the pressure detector extends into the supporting part to be provided with a pressure sensor, and a controller is installed in the middle of the outer surface of the detection equipment support. The limiting and fixing mechanism is matched with hydraulic cylinder barrels of different sizes through cooperation of a movable supporting plate, a sliding block and a positioning clamping block, and fixing in the horizontal direction and the vertical direction is achieved; an inclined supporting rod and a threaded supporting rod of the supporting mechanism can adjust the supporting height and angle, the top of the hydraulic cylinder barrel is further stabilized, the problem of deviation during detection is solved, and accurate pressure transmission is guaranteed.

The invention relates to the technical field of valve detection, and discloses a ball valve airtightness detection method and system. The method comprises the following steps: in a pressurization and pressure maintaining test, synchronously acquiring multi-channel pressure information flow, and constructing a three-dimensional pressure field dynamic evolution sequence reflecting a sealing interface pressure transmission process; time-frequency domain cross comparison is carried out on the sequence and a leakage signal simulation library, potential leakage characteristic signals are extracted, reverse tracing analysis of a leakage energy propagation path is carried out on the potential leakage characteristic signals, and therefore space coordinates and energy intensity of a suspected leakage source are determined. And finally, calculating an overall leakage state index, and generating a sealing state evaluation map and a maintenance operation sequence. According to the method, the transformation from single-point pressure monitoring to three-dimensional pressure field dynamic analysis is realized, the position of a leakage source can be accurately positioned, and the detection intuition and the maintenance pertinence are improved.

The utility model relates to a test device for testing a relationship between fractured rock mass damage and permeability change. A bidirectional loading unit comprises a sample underframe, a long-end fixing plate, a wide-end fixing plate, a lateral pressure transmission mechanism and a manual turbine loading device, the sample underframe is of an I-shaped structure; the two long-end fixing plates are oppositely fixed on the outer sides of the two ends of the sample underframe in the length direction; the two wide-end fixing plates are oppositely fixed on the front side and the rear side of the web plate on the sample underframe; the two lateral pressure transmission mechanisms are oppositely distributed left and right; the lateral pressure transmission mechanism comprises a lateral pressure plate, a main guide rod, a pressure bearing end and an auxiliary guide rod; the manual turbine loading device comprises two lateral counter-force plates, two lateral counter-force reinforcing rods, two manual turbine speed reducers, two flexible pressurizing plates and two pressure sensors; the vertical loading unit comprises an upper pressing plate, a dowel bar and a variable cross-section connector; and the permeation unit comprises two glass plates. The device can be used for testing the deformation, fracture, strength and permeation characteristics of the fractured rock mass sample under different confining pressures.

The invention relates to the technical field of performance detection of foam cement slurry for well cementation of oil and gas wells, in particular to a device and method for evaluating the compression performance of foam cement slurry. The former comprises a pressure tank, a test tank and a gas adding tank, the upper end of the pressure tank is provided with a gas inlet communicated with the inside and the outside, and the lower end of the pressure tank is provided with a liquid outlet communicated with the inside and the outside; a pressure transmission piston is vertically and slidably installed in the pressure tank in a sealed mode, and an identification layer is arranged on the outer side of the pressure tank. The device is reasonable and compact in structure, the gas adding tank can inject gas with different pressure values into the pressure tank, the control valve facilitates pressure control between the pressure tank and the testing tank, scale marks are marked on the measurable cup body so that the volume change of water for testing can be observed conveniently, and therefore the volume change of foam mud to be tested is reflected; the pressure measuring piston can transmit pressure to the foam cement slurry in the testing tank, air between the pressure measuring piston and the inner side of the upper portion of the testing tank can be emptied during operation by arranging the exhaust hole and the exhaust valve, and the measured volume error is reduced.

The invention discloses automatic batch hole machining equipment which comprises a first base, a workpiece, an X-axis and Y-axis moving platform and a Z-axis moving platform, the X-axis and Y-axis moving platform and the Z-axis moving platform are mounted at the top of the first base, and the Z-axis moving platform is in transmission connection with a multi-axis drilling mechanism. According to the automatic batch hole machining equipment and the hole machining method thereof, the arranged outer tool frame and the tool platform arranged in the outer tool frame in a sleeved mode are matched with the four clamping centering assemblies and the four jacking transmission assemblies, and a transmission gear, a band-type brake stepping motor, a waterproof shell and an arc-shaped toothed plate are combined for use; the clamping device is used for automatically clamping and centering a workpiece by taking the tool platform as a support workpiece, the tool platform is driven by the meshing adjusting device, and the processed workpiece is subjected to inclination adjustment to be linked with a plurality of injected cooling liquid output by a cooling liquid conveying pipe formed by a U-shaped barrel, a plurality of liquid conveying curved pipes and a drainage pipe; the machined workpiece and the tool platform are comprehensively flushed at multiple points through multiple injected cooling liquid, and then the comprehensive cleaning effect is achieved.

The invention provides an anchoring packer for a multilateral well and multilateral well drilling equipment. The anchoring packer comprises a mandrel assembly, an anchoring mechanism and a rubber sleeve sealing mechanism. The mandrel assembly comprises an upper connector with a pressure transmission hole and a mandrel forming a first pressure cavity with the upper connector. The anchoring mechanism comprises an upper slip arranged on the mandrel in a sleeving mode, a conical sleeve and a first piston assembly, the conical sleeve is in sliding connection with the upper slip through an inclined face, and the conical sleeve and the mandrel are limited through a first shear pin. The rubber sleeve sealing mechanism is arranged below the anchoring mechanism and comprises a second piston assembly, a rubber sleeve and an extrusion sleeve, and the overlapping position of the second piston assembly and the first piston assembly is connected through a second shear pin. The mandrel is provided with a hydraulic channel communicated with the first pressure cavity and the second pressure cavity. During operation, hydraulic oil enters through the pressure transmission hole to drive the first piston assembly to move upwards to cut off the first shear pin, and the conical sleeve is pushed to enable the upper slip to anchor the well wall in the radial direction; meanwhile, the second piston assembly is driven to move downwards to cut off the second shear pin, and the rubber sleeve is extruded to radially expand to achieve sealing.

The invention discloses a wall detection device for architectural design, and relates to the technical field of wall detection, the wall detection device comprises a detection main frame body, a first motor and a second motor are symmetrically mounted on the upper surface of the bottom of the detection main frame body, and output shafts of the first motor and the second motor are fixedly connected with a lifting mechanism; the wall detection device for architectural design further comprises a pressure gauge and three contact wheels which are arranged in an arc shape to form an integral contact surface, the transverse moving mechanism is linked with the lifting mechanism to perform multi-area detection on the wall, and when the pressure adjusting mechanism performs movement detection in the vertical and horizontal directions, the pressure adjusting mechanism can adjust the pressure in the vertical and horizontal directions. The abutting wheels conduct abutting type elastic pressure self-adjustment on the radian of the wall and feed pressure elasticity back to the pressure gauge, the auxiliary deformation mechanism is matched with the radian through elastic deformation of the center and the abutting wheels on the two sides, and the comprehensive pressure of the abutting wheels on the wall is transmitted to the pressure gauge. The multi-dimensional cooperative detection optimization effect of a mechanical structure, pressure feedback and motion control is achieved.

Disclosed in the present invention is a compressed gas energy storage system capable of constant-pressure gas storage. The compressed gas energy storage system comprises a high-pressure gas storage unit, a pressure transmission unit, a compressor pipeline, a turbine pipeline, an energy storage loop and several low-pressure gas storage units, wherein one end of each low-pressure gas storage unit is in communication with one end of the high-pressure gas storage unit via the pressure transmission unit, the other end of each low-pressure gas storage unit is in communication with one end of the turbine pipeline and one end of the compressor pipeline, the other end of the high-pressure gas storage unit is in communication with the other end of the turbine pipeline and the other end of the compressor pipeline, and the compressor pipeline is in communication with the turbine pipeline by means of the energy storage loop. The system can realize constant pressure during inflation and deflation.

The utility model relates to shield muck pipeline transportation technical field, concretely is a kind of dense paste conveying pipeline pressure testing device, including base pipe, the middle position of base pipe is equipped with oil cylinder, and the space between packing seal and diaphragm is provided with piston in the inside of oil cylinder, away from base pipe side and close to base pipe side respectively in oil cylinder, the top of oil cylinder is equipped with driving motor, and the top of piston is connected with piston rod that passes through packing seal and is connected with the output end of driving motor, and the shape of diaphragm is consistent with pipeline inner wall, so that diaphragm directly contacts with muck paste, facilitate pressure transmission, and pressure transmission is accurate;Operating clearance can make diaphragm oscillation, carry out self-cleaning, remove the muck adhered to its surface, avoid the problem that muck hardens and thus leads to signal distortion;Pressure transmitter converts pressure signal into electric signal, can be displayed in place through secondary instrument, and also can be transmitted wirelessly through wireless transmitter, and signal is wirelessly transmitted.

The invention provides a laboratory reagent distribution device and a laboratory reagent distribution method. The distribution device comprises a rack, a distribution quantity control mechanism arranged on the rack, a pressure transmission assembly and a multi-channel cooperative control valve group, the distribution quantity control mechanism is used for generating distribution pressure with preset volume, a pressure outlet of the distribution quantity control mechanism is connected with a first transmission port of the pressure transmission assembly, and a second transmission port of the pressure transmission assembly is connected with an air inlet of the multi-channel cooperative control valve group; the multi-channel cooperative control valve set comprises a valve element and a valve seat, a main air guide channel is arranged in the valve element, a plurality of branch air guide channels are arranged around the center of the valve seat in the radial direction of the valve seat, and the valve element is rotationally connected with the valve seat so that the main air guide channel can be communicated with any branch air guide channel. The plurality of branch air guide channels are respectively connected with a plurality of reagent bottles in a one-to-one correspondence manner; each reagent bottle is connected with a liquid outlet pipe group for distributing reagents; the method can be suitable for a small-scale intermittent experiment mode, the comprehensive utilization rate of the reagent can be improved, and the taking process is simplified.

This utility model discloses a winding pressure roller, comprising: an outer roller, an elastic layer covering the outer circumferential surface of the outer roller, and a left and right shaft head of the pressure roller, which are coaxially assembled inside the outer roller. The left shaft head includes a left first section and a left second section arranged along its axial direction, and the right shaft head includes a right first section and a right second section arranged along its axial direction. The outer circumferences of the left first section and the right first section are respectively connected to the inner wall of the outer roller; gaps are formed between the outer circumferences of the left second section and the right second section and the inner wall of the outer roller. When the left and right shaft heads are assembled inside the outer roller, a certain gap is left between their opposing inner end faces. This utility model's winding pressure roller, through its split shaft head and key gap design, effectively avoids the direct impact of shaft head deformation on the outer roller, ensuring uniform pressure transmission, thereby improving winding quality and production efficiency.

The utility model belongs to the technical field of barometers, and particularly relates to a barometer which comprises a meter shell, an air inlet, a meter cover, a dial plate and a pointer, the air inlet is arranged on the meter shell, air transmits pressure to a piston through the air inlet, the piston converts the air pressure into linear displacement, and the pointer is arranged on the meter shell. The piston transmits power to the gear output piece through the two-stage transmission mechanism, the gear output piece is connected with the pointer and drives the pointer to deflect on the dial plate, the piston is further connected with a reset piece, and the reset piece acts on the piston and provides pressure opposite to gas acting force. By means of a two-stage transmission mechanism composed of the double sector gears, the rack frame and the cylindrical gear, tiny linear displacement of the piston is amplified and converted into remarkable deflection of the pointer, the detection sensitivity of tiny air pressure changes is remarkably improved, the reading range is expanded, and reading is more accurate and visual.

The present invention discloses a crushing device for asphalt production and processing with a screening function, which relates to the technical field of asphalt crushing devices. It includes a bracket, a housing, a crushing roller, a discharge port, a cold brittle component, a drive component, and a detection cleaning plate. The present invention uses the cleaning claws on the cleaning head to convert the convex state of the roller body into its own deflection. The cleaning head further converts the deflection into the displacement of the transmission device through the transmission teeth. The displacement of the transmission device drives the flow medium to compress, thereby causing pressure on the transmission plug. The transmission plug transmits the pressure to the piezoelectric body. The piezoelectric body generates an electrical signal after being compressed, achieving the purpose of detecting the cleanliness of the roller body. The fixing device drives the tooth column to rise, and the tooth column drives the cleaning head to reverse deflection and reset. Under the action of the fixing device, the cleaning head is fixed. After being fixed, the cleaning head uses the cleaning claws on it to scrape the raw materials on the roller body, realizing the state conversion of the cleaning claw activity detection and fixed cleaning.

The utility model discloses a temperature measuring device and a vehicle, and the device comprises a heat conduction housing which comprises a cavity; the base is connected with the heat conduction shell, and the base and the heat conduction shell jointly limit the cavity to form a sealed gas containing cavity; the pressure detection assembly is arranged in the gas containing cavity and is arranged on the base; and the pressure conduction assembly is arranged on the base, the gas containing cavity covers the pressure conduction assembly, and the pressure conduction assembly covers the pressure detection assembly and is used for transmitting gas pressure in the gas containing cavity to the pressure detection assembly. According to the utility model, a pressure value of gas can be converted into a temperature value, so that a stable corresponding relation between the pressure value and the temperature value can be obtained, and the device has a wider temperature measurement range and good measurement precision.

The utility model belongs to the field of valves in wells, and particularly relates to a reverse circulation valve. In order to prolong the service life of the reverse circulation valve and save cost, the utility model provides the reverse circulation valve. The reverse circulation valve comprises a spring, a piston, an upper connector, an outer cylinder and a lower connector, a pressure transmitting hole is formed in the outer cylinder, and the piston comprises a pressure bearing face used for bearing pressure. The piston is located in the outer cylinder, the upper connector or the outer cylinder comprises a spring installation face, the spring is installed between the spring installation face and the piston, the lower connector or the outer cylinder comprises a limiting part, the limiting part is used for limiting the limiting position of downward movement of the piston, and a radial through hole used for being aligned with the pressure transmitting hole during inverse well flushing is formed in the piston; and the inner diameter of the pressurizing seat is smaller than the inner diameters of the upper joint, the lower joint and the outer cylinder. The pressurizing seat is additionally arranged on the piston, and when the spring cannot reset the piston, external force is applied to the pressurizing seat to drive the piston to reset, so that the service life of the reverse circulation valve is prolonged, and the cost is saved.

The present invention discloses a force feedback method for an operating shaft of a remote operation device, which is characterized by the following steps: an operating force is applied to the operating shaft; detecting the magnitude of the operating force applied to the operating shaft in the detecting step; if the value detected in the step is greater than or equal to a first set value, the operating shaft can be rotated; if the value detected in the step is less than the first set value, the operating shaft cannot be rotated; a force feedback device for an operating shaft of a remote operation device is also disclosed, which is characterized by including an operating shaft fixing seat, a force feedback turbine, a force feedback worm, a force feedback transmission shaft, a force feedback shaft sleeve, a force feedback spring, a force feedback pressure transmission plate, a force feedback pressure sensor, a force feedback limiting plate, a force feedback coupling and a force feedback motor. The beneficial effects of the present invention are: the present invention solves the problem that there is no feedback force on the hand of the operator during the operation of the remote operation device, and the operator can feel a certain resistance on the hand during the operation, thereby increasing the operation experience.

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 application discloses a far-near field cooperative roof cutting method and relates to the technical field of roof cutting. It comprises the following steps: using single hydraulic prop to cooperate with metal hinged roof beam and cross beam to pre-support the roof of the roadway, wherein the pre-roadway reinforcement is performed before the working face is mined, and the length of the pre-roadway reinforcement of the roadway to be left is appropriately lengthened, considering that the directional pre-splitting cutting hole is better in cutting seam outside the pre-pressure range. The application has the beneficial effects that: when in use, the pre-splitting roof cutting and the forced roof falling of the goaf block most of the mining pressure transmission to the roof of the roadway to be left, and the falling gangue supports the roof of the roadway to be left, thereby ensuring the stability of the roof of the roadway to be left along the goaf, and auxiliary support is performed during the roof cutting, so as to prevent the deformation of the roadway to be left from being too large and affecting the roadway to be left.

The invention discloses an electric control opening device for a fracturing sliding sleeve. The device comprises an anchoring short section, a pressure transmission shaft, an outer sheath and a plug, wherein one end of the outer sheath is connected with the anchoring short section through an upper fixing screw; the other end of the connecting rod is connected with the plug through a lower fixing screw; the anchoring short section is circumferentially fixed with the pressure transmission shaft through a first limiting mechanism; the anchoring short section is axially fixed with the pressure transmission shaft through a second limiting mechanism; wherein a signal identification unit and a power supply unit are arranged in the outer sheath; a hydraulic driving unit is arranged on the pressure transmission shaft; the power supply unit supplies power to the signal identification unit and the hydraulic driving unit; the signal identification unit is used for identifying whether a built-in RFID label of the fracturing sliding sleeve is consistent with a preset label or not and starting the hydraulic driving unit according to an identification result; the hydraulic driving unit enables the pressure transmission shaft to be separated from the anchoring short section through a first limiting mechanism and a second limiting mechanism. The technical problem that a conventional mechanical opening sliding sleeve cannot meet the requirements for on-site large-displacement construction and high construction efficiency is solved.