41results about How to "Easy to align and install" patented technology

A spaceborne integrated miniaturized composite connector comprises a composite socket (1) and a composite plug (6). The composite socket (1) comprises a socket shell (2), a low-frequency socket contact element (3), an RF (radio frequency) pin contact element (4) and dielectric filling material (5), and the composite plug (6) comprises a plug shell (7), an RF socket contact element (8), a stranded wire pin group (9), a plug base (10), a locking screw (11), a tail cover (12), insulation potting adhesive (13), a low frequency wire (14), an RF coaxial line (15) and a clamp (16). The composite connector avoids the connection of a variety of multiple high-frequency connectors, improves reliability and air tightness and reduces the weight of the connector and a cable. Furthermore, the composite connector has the advantages of mixed loading of high and low frequency, small spacing, highly reliable electrical contact, misplug prevention guide, tight locking property, high air tightness and easy installation.

The invention relates to a nuclear magnetic resonance gyroscope experiment platform structure. The platform is used for experimentally researching and verifying various techniques, such as, air chamber parameters, light path features and magnetic field distribution, of a nuclear magnetic resonance gyroscope prototype. The structure mainly comprises an oven structure, a coil structure, a magnetic shielding structure and a light path system, wherein the oven structure is used for fixing and heating an atom air chamber and researching different heating techniques; the coil structure is positioned and fixed by a V-shaped slot, a key, a bracket, and the like, and can be used for performing high-precision magnetic field control and compensation; the magnetic shielding structure has a four-layer square shielding barrel and is used for shielding an outside magnetic field; and the light path is located on the exterior of the shielding barrel, is constructed by adopting a cage type system and can be conveniently adjusted and aligned. The nuclear magnetic resonance gyroscope experiment platform structure is reasonable in layout, is conveniently mounted and aligned, is simple in experiment operation, can be used for experimentally researching different techniques and can establish a basis for the research and development of the nuclear magnetic resonance gyroscope prototype.

The invention relates to a triaxial cell for testing geomaterials on specimens, for example specimens of rock, ground or manufactured materials, comprising: at least one piston (2) for subjecting a specimen (3) to a stress directed along the longitudinal axis of the specimen; hydraulic means for subjecting the lateral wall of the specimen (3) to a stress, under the pressure of a fluid, said cell comprising at least one sealed test chamber (5) in which the specimen (3) is placed; and a circuit for the controlled pressurization of said test chamber with a fluid, called the pressurizing fluid, and for the controlled draining of said fluid therefrom. According to the invention, said cell has means for subjecting the specimen to a tensile force, which means are designed for removably fasteningit between two attachments intended to move apart or closer together under the action of said at least one piston so as to subject said specimen to said longitudinal stress or on the contrary to remove the load therefrom.

The invention discloses an installation method for backing plates of a vertical rolling mill. The method comprises the following steps that the vertical rolling mill is hoisted to an installation position, and a rolling mill bottom plate is fixed temporarily through foundation bolts; according to the number and positions of the backing plates to be installed, a plurality of sets of supporting plates and fixing plates are installed on the corresponding positions of the two sides of the rolling mill bottom plate respectively, and the supporting plates and the fixing plates are located on the two sides of the rolling mill bottom plate respectively and connected integrally through fasteners; and the backing plates are divided into groups to be placed on the corresponding supporting plates respectively, and installation adjusting is conducted on the rolling mill according to the device installation requirement. By means of the installation method for the backing plates of the vertical rolling mill, it is guaranteed that the backing plates are stably installed, the risk that the backing plates fall in the leveling process of the rolling mill is effectively reduced, the installation difficulty of the backing plates is lowered, devices are conveniently installed and leveled, and construction efficiency is effectively improved.

The invention provides an aircraft driving wheel column force sensor which is capable of directly measuring the pushing force and the torsional moment of an aircraft driver on a driving wheel during an aircraft driving process. The aircraft steering wheel column force sensor comprises a driving wheel connection structure, a wheel column force sensor body and a driving column connection structure. The wheel column force sensor body comprises a box body structure which is used for measuring the pushing force and a prism structure which is used for measuring the torque. The box body structure and the prism structure are elastomer. Upper and lower inner surfaces of the box body structure are respectively provided with at least one group of resistance strain gauges. One end of the prism structure is fixed on the upper or lower surface of the box body structure along the axis. A boss and a connection spline are successively arranged on the other end. At least two side walls of the prism structure are respectively provided with at least one group of resistance strain gauges. The box body structure is embedded in a groove arranged in the driving wheel connection structure. The spline is embedded in the driving column connection structure.

The invention provides a device for a power battery module side plate tensile test. The device comprises a base and a compression assembly. The base is fixed to a test table and provided with a threaded hole. The compression assembly comprises a vertically-arranged screw rod and a pressing plate horizontally installed at the lower end of the screw rod. The upper end of the screw rod penetrates out of the threaded hole, and the screw rod is in threaded connection with the threaded hole. The pressing plate is located between the base and the test table. The pressing plate can rotate along with the screw rod in the threaded hole so as to move up and down. The device is fixed to the test table and can accurately fix and press a power battery module, and accuracy of the tensile test can be greatly improved.

The invention discloses a subway station vertical face erecting connecting structure and an installation component. A lifting part is installed above a bracket through a supporting arm in a parallel movement manner; a connecting frame is connected to the upper part of the lifting part through a horizontal movement component with a horizontal linear movement; a driving mechanism is installed on thebracket and connected to the lifting part; the installation component includes the vertical face erecting connecting structure; a scissor retractable component connects a base and the bracket; and anone-way transmission component is installed on the base and connected to the scissor retractable component through a pulling structure. The driving mechanism drives the lifting part to cooperate withthe supporting arm so that the connecting frame swings horizontally above the bracket to adjust the height up and down; while adjusting the height, the connecting frame is always kept in a horizontalposition, which finally drives the subway vertical face material fixed on the connecting frame to raise the height slightly; and the horizontal movement component drives the connecting frame to movehorizontally, thereby driving the vertical face material to follow the connecting frame to move in a short distance, which is convenient for materials in different positions to be connected to each other.

The invention discloses jacking equipment of a steel structure beam for installation of a small factory building, and belongs to the technical field of construction appliances. The jacking equipment comprises a working box, and further comprises a moving mechanism, an elevating mechanism, an auxiliary mechanism, a limiting mechanism, a beam pushing mechanism and two lifting mechanisms, the moving mechanism is installed on the working box, the two lifting mechanisms are installed at the two ends of the moving mechanism correspondingly, the elevating mechanism is installed on one lifting mechanism, the auxiliary mechanism is installed on the other lifting mechanism, the limiting mechanism is installed on the auxiliary mechanism and the elevating mechanism, and the beam pushing mechanism is installed above the working box. According to the jacking equipment of the steel structure beam for installation of the small factory building, the limiting mechanism limits the vertical position of the steel structure beam, then the elevating mechanism and the auxiliary mechanism are matched to obliquely lift the steel structure beam to the position above a factory building cross beam, and then the beam pushing mechanism is used for adjusting the horizontal position of the steel structure beam to make the steel structure beam aligned with a mounting station.

The invention discloses a 4+6 spindle combined type special multi-spindle drilling machine for riser bus bar groups of aluminum electrolysis cells. The drilling machine comprises a door type machine frame, wherein the machine frame comprises a bottom plate, a top plate and side vertical plates on the two sides, a polished shaft supporting plate is fixedly connected to the inner sides of the side vertical plates, a set of guiding polished shafts are installed between the front of the machine frame and the polished shaft supporting plate, another set of guiding polished shafts are installed between the top plate in the back of the machine frame and the polished shaft supporting plate, and a set of the guiding polished shafts in the front of the machine frame and a set of the guiding polished shafts in the back of the machine frame are provided with gear case supports; a four-shaft gear case and a six-shaft gear case are installed in the gear case supports from the lower part and are fixed to the gear case supports through connecting bolts, and the position layouts of working shafts of the four-shaft gear case and the six-shaft gear case are identical with hole sites of the riser bus bar groups; the six-shaft gear case can be installed in the mode of being turned by 45 degrees; and drill bits are installed at the lower ends of the working shafts, power motors driving the working shafts are arranged on the gear case supports, and a feeder driving the gear case supports to move up and down is arranged on the top plate. The drilling machine is compact in structure and can realize continuous machining, and the gear cases are easy to replace and are good in universality.

The invention discloses an anti-deformation-type multi-layer wood composite structure with a heating function. The problems that as for an existing overall floor, the length, width and the height areconstant, cutting is inconvenient in mounting, and the adaptability is low are solved. The anti-deformation-type multi-layer wood composite structure comprises a wood floor body and further comprisesa heat conduction layer, a heating layer, a reflecting layer and a heat insulation layer which are sequentially arranged below the wood floor body. The wood floor body is in a cuboid shape, a cavity body is formed in the middle portion of the bottom of the wood floor body in the long edge direction. The heat conduction layer, the heating layer, the reflecting layer and the heat insulation layer are arranged in the cavity body, the side wall of one long edge of the wood floor body is provided with a convex strip with the same length as the wood floor body, and the side wall of the other long edge of the wood floor body is provided with a groove matched with the convex strip. Connecting cables which penetrate through the wood floor body and communicate with the heating layer are arranged onthe convex strip and the groove correspondingly. The anti-deformation-type multi-layer wood composite structure with the heating function has the advantages that the length can be cut, and the groundheating function is not affected after cutting.

The invention provides a convenient installation structure for the inner rail of a two-section server slide rail. The front bracket of the outer rail is fixed with the front end of a front bracket auxiliary slide rail. The rear side of the front bracket auxiliary slide rail is slidably sleeved into the chute of an outer rail reinforcement rail. The rear side of the front bracket auxiliary slide rail is fixed with an elastic piece. One end of the elastic piece is connected with at least one end of a tension spring. The other end of the tension spring is connected with the main wall of the outerrail reinforcement rail. The other side of the elastic piece is fixed with an outer rail ejection control member. The blocking portion of the outer rail ejection control member is used to block the upper wall of the outer rail reinforcement rail. A pressing portion on the front side of the blocking portion is pressed to apply force to enable the blocking portion to break away from the front end of the upper wall of the outer rail reinforcement rail. The outer rail reinforcement rail can automatically eject outward through the tension of the tension spring together with the outer rail. The front end of the outer rail is exposed to the front end of a server rack, so that the inner rail can be conveniently aligned and installed into the outer rail.

The invention discloses a steaming oven with a rotary grill. The steaming oven comprises an oven body, wherein a horizontal grill and a rotary grill are placed in a working cavity of the oven body; the rotary grill is detachably connected to the oven body; the rotary grill comprises a rotating disc, a rotating rod and two rotating forks; the rotating disc comprises a left rotating disc and a rightrotating disc; the left rotating disc is movably connected to the left side wall of the oven body in a sleeved manner; and the right rotating disc is connected to a rotating head on the right side wall of the oven body. A using method of the rotary grill comprises the following steps of 1) installation of the right rotating disc; 2) installation of the left rotating disc; 3) placement of food onthe rotating rod; 4) placement of food on an auxiliary rod; and 5) baking operation. The food is subjected to rotary baking through the design of the rotary grill, so that the baking of the food is more evenly heated, and thus a good food effect is achieved; and furthermore, a detachable structure is adopted between the rotary grill and the oven body, so that the assembly or disassembly of the rotary grill is selected according to actual requirements, and thus the steaming oven is more convenient to use.

The invention discloses an energy-saving and convenient-to-adjust assembly type dry-hanging wall surface. The assembly type dry-hanging wall surface comprises a wall body of a house, a plurality of longitudinal hanging rods and a plurality of transverse hanging rods are arranged on the front side surface of the wall body in a criss-cross mode, the plurality of longitudinal hanging rods and the plurality of transverse hanging rods are assembled to be divided into a plurality of through openings with the same area, and panels are installed at the through openings; the rear end of each longitudinal hanging rod is provided with a plurality of adjusting assemblies capable of adjusting the flatness of the intersection of the longitudinal hanging rod and the corresponding transverse hanging rod;and each adjusting assembly comprises a three-spoke type fixing piece fixed to the wall, the front of each adjusting assembly is sleeved with a rotating sleeve for pulling the flatness of the longitudinal hanging rods to be adjusted, and the front end of each rotating sleeve is connected with a movable column moving in the central axis direction of the rotating sleeve. According to the energy-saving and convenient-to-adjust assembly type dry-hanging wall surface, the overall length is changed by rotating the rotating sleeves of the adjusting assemblies, after the longitudinal hanging rods arefixed to the front ends of the adjusting assemblies, the flatness can be changed along with length adjustment, rapidness and trouble saving are achieved, and rapid assembly is achieved by arranging the transverse hanging rods which can be directly clamped to the longitudinal hanging rods.

The invention provides a device for a power battery module side plate tensile test. The device comprises a base and a compression assembly. The base is fixed to a test table and provided with a threaded hole. The compression assembly comprises a vertically-arranged screw rod and a pressing plate horizontally installed at the lower end of the screw rod. The upper end of the screw rod penetrates out of the threaded hole, and the screw rod is in threaded connection with the threaded hole. The pressing plate is located between the base and the test table. The pressing plate can rotate along with the screw rod in the threaded hole so as to move up and down. The device is fixed to the test table and can accurately fix and press a power battery module, and accuracy of the tensile test can be greatly improved.

The invention discloses a modular intelligent logistics center transferring board disassembling and installing device and an accessory thereof. Connection is formed through the accessory and a transferring board transmission buckle plate, then the modular intelligent logistics center transferring board disassembling and installing device and the accessory are disassembled and installed by pullingthe disassembling and installing device to disassemble the transmission buckle plate as a whole, the size is small, and the modular intelligent logistics center transferring board disassembling and installing device is suitable for the disassembly of transferring boards. The modular intelligent logistics center transferring board disassembling and installing device is characterized in that a pressure block is placed at one end of a holding handle, non-slip pattern is formed in the surface of the holding handle and can be mesh, fishtail, wave, and preferably, the mesh, the pressure block is ofa cylindrical structure, a sliding groove is formed in the outer side of the pressure block and extends to the bottom of the pressure block, the sliding groove is the annular groove, and the width ofthe sliding groove is one-fourth of the height of the pressure block; and a limiting ring is placed on the outer side of the pressure block in a sleeving mode and located in the bottom end of the sliding groove, one end of a sliding sleeve is placed on the pressure block in a sleeving mode, a storing groove is formed in the inner side wall of the sliding sleeve, the limiting ring is placed in thestoring groove, the width of the storing groove is less than the width of the sliding groove, and the other end of the sliding sleeve is of a closed structure.

The invention provides a convenient installation structure for the inner rail of a two-section server slide rail. The front bracket of the outer rail is fixedly connected with the front end of a frontbracket auxiliary slide rail. The rear side of the front bracket auxiliary slide rail is slidably sleeved into the chute of an outer rail reinforcement rail. The rear side of the front bracket auxiliary slide rail is fixedly connected with one end of an elastic piece. The other end of the elastic piece is fixedly connected with an outer rail pull-out control member. The outer rail pull-out control member comprises a blocking portion which is used to block the front end of the upper wall of the outer rail reinforcement rail. The front side of the blocking portion is connected with a pressing portion. The pressing portion is pressed to apply force to enable the blocking portion to break away from the front end of the upper wall of the outer rail reinforcement rail. The outer rail reinforcement rail can be pulled outward and slide outward relative to the front direction of the front bracket auxiliary slide rail, and at the same time is pulled outward along with the outer rail for a distance. The front end of the outer rail is exposed to the front end of a server rack, so that the inner rail can be conveniently aligned and installed into the outer rail.

The invention relates to a large-size cylindrical organic glass assembly tool and an assembly method thereof. The large-size cylindrical organic glass assembly tool comprises a tool base which is provided with a horizontal rail; edge seat regulation bases for fixing edge window seats are arranged on the two sides of the horizontal rail respectively; a plurality of middle seat regulation bases for fixing middle window seats are arranged between the edge seat regulation bases on the horizontal rail; organic glass regulation bases for fixing cylindrical organic glass are arranged between each edge seat regulation base and the corresponding middle seat regulation base and between every two middle seat regulation bases on the horizontal rail respectively; window seat hooping tools for fixing window seats are arranged on the edge seat regulation bases and the middle seat regulation bases respectively; and each organic glass regulation base is provided with an organic glass supporting seat for fixing and positioning the cylindrical organic glass. According to the large-size cylindrical organic glass assembly tool and the assembly method thereof, assembly and positioning of the large-size cylindrical organic glass are accurate, assembly is rapid, and the assembly efficiency is improved.

The invention discloses a front cover structure of an explosion-proof brushless motor. Evenly distributed installation grooves, the connection between the front cover and the fixed ring is evenly provided with a fixing device that matches the installation groove, the fixing device includes a sliding pin and a limit block, and one end of the sliding pin is connected to the front cover Fixedly connected, the other end of the sliding pin is fixedly connected with the limit block, one side of the installation groove is provided with a slide track, and the bottom of the slide track is provided with a limit groove matching the limit block, so A fixing block is arranged on the outside of the sliding track away from the installation groove, and an accommodating cavity is arranged inside the fixing block. The present invention is very convenient to disassemble and maintain when internal failure occurs and damages, saving working time.

The invention relates to a triaxial cell for testing geomaterials on specimens. The triaxial cell has at least one piston for subjecting a specimen to stress directed along the longitudinal axis of the specimen. Hydraulic means are provided for subjecting the lateral wall of the specimen to a stress, under the pressure of a fluid. The cell has at least one sealed test chamber-in which the specimen is placed, and a circuit for the controlled pressurization of said test chamber with a fluid, called the pressurizing fluid, and for the controlled draining of said fluid therefrom. The cell has mechanisms for subjecting the specimen to a tensile force, which are configured for removably fastening it between two attachments intended to move apart or closer together under the action of the piston so as to subject said specimen to longitudinal stress or on the contrary to remove the load therefrom.

The invention relates to a steel structure assembled building assembly, which comprises a main steel plate, an interior wall panel, a vapor barrier board, a protection panel and an exterior wall panel which are vertically arranged; the interior wall panel and the vapor barrier panel are respectively fixed On both sides of the main steel plate; a plurality of vertical support beams are evenly spaced and fixed on the other side of the steam trap; the end of the support beam far away from the steam trap is provided with a fixing groove; A fixed block is vertically fixed on the end surface of the protective plate close to the steam trap; a limit block is fixed on one end surface of the fixed block; the fixed block cooperates with the limit block and can be laterally engaged In the fixing groove; the other side of the protective plate is fixed with a plurality of horizontal keel boards at even intervals; the outer wall board is fixed to the other side of the keel board; two adjacent support beams A plurality of horizontal supports are fixed at even intervals.

The invention discloses an installation method for backing plates of a vertical rolling mill. The method comprises the following steps that the vertical rolling mill is hoisted to an installation position, and a rolling mill bottom plate is fixed temporarily through foundation bolts; according to the number and positions of the backing plates to be installed, a plurality of sets of supporting plates and fixing plates are installed on the corresponding positions of the two sides of the rolling mill bottom plate respectively, and the supporting plates and the fixing plates are located on the two sides of the rolling mill bottom plate respectively and connected integrally through fasteners; and the backing plates are divided into groups to be placed on the corresponding supporting plates respectively, and installation adjusting is conducted on the rolling mill according to the device installation requirement. By means of the installation method for the backing plates of the vertical rolling mill, it is guaranteed that the backing plates are stably installed, the risk that the backing plates fall in the leveling process of the rolling mill is effectively reduced, the installation difficulty of the backing plates is lowered, devices are conveniently installed and leveled, and construction efficiency is effectively improved.

The invention discloses a forming method of a mold base. The forming method comprises following steps of raw material preparation, according to the raw material formula, mixing and stirring the raw materials as the proportion, putting the mixed raw materials into a smelting furnace, carrying out melting, and casting forming; injecting a metal mixed solution molten in the S1 into a casting mold, forming a composite aluminum plate, through a laser cutting machine, cutting the composite aluminum plate into aluminum blocks with the same size, preparing a reinforcing frame, carrying out laser cutting on a formed supersteel plate, forming a reinforcing frame B of the rectangular frame structure, carrying out preliminary milling, preliminarily milling the aluminum blocks A, and according to the size of the reinforcing frame B, through a numerical control milling machine, machining matched mounting grooves in the side walls of the aluminum blocks A. The service life of the mold base is prolonged, the defect that the mechanical strength of the aluminum plate mold base is not high is overcome, meanwhile, production cost is saved, the mold base is more durable, meanwhile, the weight of the mold base is reduced, carrying and mounting are facilitated, and labor force is reduced.

The invention provides an aircraft driving wheel column force sensor which is capable of directly measuring the pushing force and the torsional moment of an aircraft driver on a driving wheel during an aircraft driving process. The aircraft steering wheel column force sensor comprises a driving wheel connection structure, a wheel column force sensor body and a driving column connection structure. The wheel column force sensor body comprises a box body structure which is used for measuring the pushing force and a prism structure which is used for measuring the torque. The box body structure and the prism structure are elastomer. Upper and lower inner surfaces of the box body structure are respectively provided with at least one group of resistance strain gauges. One end of the prism structure is fixed on the upper or lower surface of the box body structure along the axis. A boss and a connection spline are successively arranged on the other end. At least two side walls of the prism structure are respectively provided with at least one group of resistance strain gauges. The box body structure is embedded in a groove arranged in the driving wheel connection structure. The spline is embedded in the driving column connection structure.

This application relates to a Larsen steel sheet pile cofferdam, including two rows of Larsen steel sheet piles arranged along the width direction of the river, two rows of outer foundation piles parallel to the Larsen steel sheet piles and located outside the two rows of Larsen steel sheet piles, Two rows of inner foundation piles parallel to the Larsen steel sheet piles and located inside the two rows of Larsen steel sheet piles, outer guide rails arranged along the width direction of the river and between the Larsen steel sheet piles and the outer foundation piles, and along the width of the river The direction is set and the inner guide rail frame is located between the Larsen steel sheet pile and the inner foundation pile. The outer guide rail frame and the inner guide rail frame are respectively detachable and installed on the outer foundation pile, the inner foundation pile, and the ends of the two rows of Larsen steel sheet piles Arriving at the river bank, the outer rail frame and the inner rail frame are respectively provided with positioning devices for positioning Larsen steel sheet piles. The application has the effects of reducing construction difficulty and improving construction precision.

The invention provides a convenient installation structure for the inner rail of a two-section server slide rail. The front bracket of the outer rail is fixedly connected with the front end of a frontbracket auxiliary slide rail. The rear side of the front bracket auxiliary slide rail is slidably sleeved into the chute of an outer rail reinforcement rail. The rear side of the front bracket auxiliary slide rail is fixedly connected with one end of an elastic piece. The other end of the elastic piece is fixedly connected with an outer rail pull-out control member. The outer rail pull-out control member comprises a blocking portion which is used to block the front end of the upper wall of the outer rail reinforcement rail. The front side of the blocking portion is connected with a pressing portion. The pressing portion is pressed to apply force to enable the blocking portion to break away from the front end of the upper wall of the outer rail reinforcement rail. The outer rail reinforcement rail can be pulled outward and slide outward relative to the front direction of the front bracket auxiliary slide rail, and at the same time is pulled outward along with the outer rail for a distance. The front end of the outer rail is exposed to the front end of a server rack, so that the inner rail can be conveniently aligned and installed into the outer rail.

The invention discloses a mounting tool for an engine rear oil seal support, and particularly relates to the field of engine processing equipment. The mounting tool comprises a guide rod, wherein oneend of the guide rod is provided with a handle, the circumferential outer wall of the other end of the guide rod is provided with external threads, a limiting plate is arranged on the circumferentialouter wall of the other end of the guide rod, the circumferential outer wall of the guide rod is sleeved with a mounting sleeve, a fixed sleeve is welded to one end of the mounting sleeve, a fixing hole is formed in the circumferential outer wall of the fixed sleeve, and a fixing pin is inserted into the fixing hole. According to the mounting tool, three arc-shaped top plates are arranged, and theengine rear oil seal support is sleeved on the outer walls of the three arc-shaped top plates; three connecting rods are opened outwards after being extruded by a top cylinder, so that according to the requirement for fixing the engine rear oil seal support with different inner diameters, the size of the surrounding formation formed by the three arc-shaped top plates is adjusted; and the mountingtool is suitable for installation requirements of the engine rear oil seal support with different inner diameters.

The invention discloses a modularized intelligent logistics center transmission board disassembler and its accessories, which discloses a disassembly and assembly method that connects the transmission gusset through the accessories and the transmission gusset, and then removes the transmission gusset as a whole by pulling the disassembler. And its accessories are small in size and suitable for the disassembly and assembly of the transmission plate. It is characterized in that the pressure block is placed at one end of the handle, and the surface of the handle is provided with anti-slip lines. The anti-slip lines can be mesh, crow's feet and Wave pattern, preferably net pattern, the press block is a cylindrical structure, a slide groove is opened on the outside of the press block, and extends to the bottom end of the press block, the slide groove is an annular groove, and the width of the slide groove is It is a quarter of the height of the pressing block. The limit ring sleeve is placed on the outside of the pressing block and is located in the bottom of the sliding groove. One end of the sliding sleeve is placed on the pressing block. The inner wall of the sliding sleeve is provided with a receiving groove. The limiting ring is placed in the accommodating groove, the width of the accommodating groove is smaller than that of the sliding groove, and the other end of the sliding sleeve is a closed structure.