471 results about "Push and pull" patented technology

The application discloses a transfer box for precise positioning long rod, and relates to the technical field of transfer equipment, and aims to solve the technical problems that the existing loading and unloading box can fix the rod body, lacks reinforcement and protection for rod bodies with different length and width sizes, the rod body is easily damaged by bumping and impact during transportation, and the loading and unloading is complicated, and the intelligent degree of the mechanical arm is high, and the application comprises a box body mechanism and a protection mechanism, and the inner wall of the box body mechanism is connected with the protection mechanism. The application can complete the installation of the long rod through simple pushing and pulling steps, and after the installation is completed, the device can automatically adapt to the height of the long rod, so that the collision during transportation hardly affects the position of the long rod, the sliding of the long rod in the device is avoided, the protection effect of the device on the long rod is improved, meanwhile, the simple installation steps reduce the demand for the corresponding equipment when the device is used, and the operation difficulty and cost of the entire assembly system are reduced.

The utility model discloses an electric overturning poly V-belt roller machine, which is mounted at a fireproof door and comprises a mounting bracket, a main conveying frame arranged on the mounting bracket, an overturning bracket and a driving component for driving the overturning bracket to overturn around the main conveying frame, a plurality of main conveying rollers are rotationally installed on the main conveying frame, a plurality of auxiliary conveying rollers are rotationally installed on the overturning support, the main conveying frame and the overturning support are rotationally connected through the adjacent auxiliary conveying rollers, and the driving assembly is an electric push rod and is provided with a magnetic switch. After the electric push rod extends, the overturning support is overturned to the horizontal position, accurate conveying of goods is guaranteed, and after the electric push rod retracts, it is guaranteed that the fireproof door is completely closed. Compared with the prior art that a rotating shaft is driven by a motor to turn over, the turnover mechanism has the advantages that the structure is simplified, the cost is reduced, the assembly steps are simplified, and the turnover stop position is more accurate.

The utility model relates to the technical field of optical fiber connectors, and discloses a push-pull device for an optical fiber connector, and the device comprises a housing which is in transmission connection with an insertion core; the tail sleeve is connected with the shell through at least two crossed limiting structures, and the at least two crossed limiting structures are asymmetrically distributed in the direction perpendicular to the axial direction of the push-pull device; when the tail sleeve is pushed and pulled, the shell and the insertion core can move in the axial direction of the push-pull device, and the push-pull tail sleeve is flexible in the axial direction of the push-pull device. The asymmetrically-arranged cross limiting structures can form restraining force distributed in a staggered mode in the radial direction and the axial direction, and the inclination or torsion phenomenon caused by single-side stress of the outer shell and the tail sleeve is effectively restrained. Due to asymmetric distribution, push-pull force can be dispersed and transmitted in different directions, stress concentration or local abrasion caused by a symmetric structure is avoided, the loosening or clamping stagnation phenomenon caused by external force or improper operation is reduced, and the stability and reliability of connection between the tail sleeve and the shell are improved. The utility model further discloses an optical fiber connector.

The invention relates to the field of wind power tower construction, in particular to a wind power tower self-climbing crane which comprises a frame unit, a variable-diameter clamping unit and a crane unit. The frame unit comprises a main frame and a movable frame which are in sliding connection, and the main frame and the movable frame are connected through a hydraulic driving mechanism. The crane unit is arranged on the top of the main frame. The variable-diameter clamping unit comprises a first variable-diameter clamping mechanism and a second variable-diameter clamping mechanism which are arranged around the wind power tower drum, the first variable-diameter clamping mechanism is connected with the main frame, and the second variable-diameter clamping mechanism is connected with the movable frame. The first variable-diameter clamping mechanism and the second variable-diameter clamping mechanism alternately clamp the wind power tower, and the main frame and the movable frame are alternately pushed and pulled through the hydraulic driving mechanism to ascend and descend so as to drive the crane unit to move in the axial direction of the wind power tower. The problems that existing wind power hoisting equipment is difficult to enter a site, the hoisting height is limited, transition is inconvenient, and the installation efficiency is low are solved.

The utility model discloses a joint bearing axial clearance detection tool, which comprises a pressing unit, a loading unit and a detection unit, and is characterized in that the pressing unit comprises an outer ring pressing assembly and an inner ring fixing assembly, and the outer ring pressing assembly presses and fixes an outer ring of a joint bearing; the inner ring fixing assembly fixes an inner ring of the knuckle bearing in the axial direction. The loading unit comprises a loading push rod, and the loading push rod can be controlled to push and pull the inner ring of the knuckle bearing with a set load so as to drive the inner ring of the knuckle bearing to move relative to the outer ring of the knuckle bearing in the axial direction; the detection unit comprises a displacement detector, and the displacement detector is used for detecting the axial clearance of the knuckle bearing; the pressing unit can respectively fix the inner ring and the outer ring of the joint bearing to be detected, the loading unit drives the inner ring to move relative to the outer ring with a set load, and the detection unit feeds back the size of the axial clearance through the displacement of the guide shaft or the pressing block. The detection tool provided by the utility model can effectively detect the size of the axial clearance of the knuckle bearing.

The invention provides an improved three-plug and discharge socket capable of being mutually locked, the improved three-plug and discharge socket comprises a discharge socket and a three-plug, the discharge socket comprises a socket shell, the upper part of the socket shell is fixedly provided with an input jack, a switch button and output jacks in sequence, the output jacks are arranged in multiple groups, the side wall of the input jack is provided with a clamping groove, and the three-plug is arranged in the clamping groove. And each output jack is provided with an overload protector in a matching manner. According to the invention, the buckle is pushed out through the locking button, so that the buckle is clamped into the clamping groove, the connection stability of the three-pin plug and the discharge power strip is improved, the push-pull block is pushed and pulled to drive the L-shaped piece to move back and forth so as to press down or push out the locking button, and the operation of the locking button on the upper part of the three-pin plug is completed. And use is more convenient, and a user can operate the buckle conveniently.

The invention relates to the technical field of clamps, in particular to a cutting clamp for a high-precision part laser cutting table. The universal adjusting ball is movably installed above the cutting table, the surface of the universal adjusting ball is movably sleeved with a tubular fixing ring, and the bottom of the tubular fixing ring is fixed to the top of the cutting table through a plurality of fixing frames; and the annular fixing plate is fixedly installed on the top of the cutting table, a gear disc is rotationally installed on the side, away from the universal adjusting ball, of the annular fixing plate, and the gear disc is movably connected with the universal adjusting ball. The driving motor is used for controlling the driving gear to rotate, the gear disc meshed with the driving gear is used for driving the universal adjusting ball to rotate, and the electric telescopic rod on the gear disc pushes the adjusting shaft to push and pull to drive the universal adjusting ball to rotate, so that the universal adjusting effect on the angle of the high-precision part is achieved, and the using effect of the device is improved.

The design method of the non-linear term offset moving-magnet vibrator meets the following conditions: (1) a moving-magnet vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator assembly and a rotor assembly; and (2) the mover assembly is subjected to electromagnetic acting force of pushing force and pulling force in pairs at the same time and presents a push-pull type structural characteristic, so that linear terms in the acting force borne by the mover assembly are overlapped and become larger, and non-linear terms in the acting force borne by the mover assembly are partially or completely counteracted and are reduced, so that the linear terms in the acting force borne by the mover assembly are reduced, and the linear terms in the acting force borne by the mover assembly are reduced. And obtaining the moving magnet type vibrator with the counteracted nonlinear term.

The utility model relates to an automatic transfer and circulation device for palletizing trays, which is characterized in that a blanking station and a recovery station are respectively provided with two transfer cylinders which are horizontally and symmetrically arranged, and the driving ends of the transfer cylinders are provided with grabbing plates; a grabbing air cylinder is installed on the grabbing plate, and the driving direction of the grabbing air cylinder is horizontal and is perpendicular to the driving direction of the transfer air cylinder. A claw plate is installed at the driving end of the grabbing air cylinder, and a U-shaped groove is formed in the claw plate. Openings of the U-shaped grooves in the two claw plates on the same station are opposite. The two ends, located in the driving direction of the transfer air cylinder, of the stacking disc are connected with grabbing columns, and the outer ends of the grabbing columns are connected with limiting plates protruding in the radial direction. And the U-shaped groove is clamped with the grabbing column. By means of the arrangement, the driving end of the transfer air cylinder can push and pull the stacking disc through the grabbing assembly of the same structure, the structure is simplified, and cost is reduced.

Disclosed in the present invention is a pre-relaxed optical fiber connector, comprising a ferrule assembly, an outer shell, an inner shell, a spring, a stopper, a sliding block and a push-pull block, wherein one end of the spring abuts against the ferrule assembly, and the other end of the spring abuts against the sliding block; the sliding block can change the length of the spring so as to press tightly against the ferrule assembly, and is fixed to the inner shell to press tightly against the ferrule assembly; and the push-pull block can push the sliding block to move, and the push-pull block can slide by a certain distance relative to the outer shell and can drive the outer shell to move. In the pre-relaxed optical fiber connector of the present invention, the push-pull block has a push-pull integrated operation function, thereby simplifying operation steps and also avoiding the situation where a user forgets the second-step operation due to carelessness during the use of the pre-relaxed optical fiber connector; in addition, the coupling and unlocking of the pre-relaxed optical fiber connector are implemented by pushing and pulling the same component, such that the use of the pre-relaxed optical fiber connector is easier and more straightforward, and it is easier for the user to learn how to use the optical fiber connector.

The invention particularly relates to a space capsule type massage chair which comprises an outer main body, a seat part, a flexible backrest part, an inner seat support and a backrest frame, the seat part and the flexible backrest part are arranged in the middle of the outer main body, and the inner seat support and the backrest frame are arranged on the inner side of the outer main body and correspond to the seat part and the backrest part. The clamping and pinching assembly can be combined with the roller back assembly or the rapping assembly to synchronously conduct massage work, clamping and pinching massage can cooperate with rolling massage or rapping massage to conduct synchronously, the muscle relaxing efficiency can be improved, the rotation angle of the roller back assembly can be controlled in a push-pull mode through stretching and retracting of the telescopic push rod, and the muscle relaxing effect is improved. The roller wheel of the roller back assembly is rapidly and flexibly controlled to be separated from or abut against the back, under the connecting action of the linkage rod set, the front-back position of the rapping assembly can be pushed and pulled at the same time through rotation adjustment of the roller back assembly, the rapping assembly makes contact with or is separated from the back, rapid switching work of the roller back assembly and the rapping assembly is achieved, and therefore the use flexibility of the equipment is improved.

The utility model provides a connecting structure and a handcart, which comprises an outer pipe and an inner pipe, and the outer pipe is sleeved on the inner pipe; each sliding assembly comprises a rolling wheel, the rolling wheels are rotatably arranged relative to the inner pipe, the rolling wheels are located in the inner pipe, and the two rolling wheels are oppositely arranged; the inner pipe is provided with at least two through grooves penetrating through the pipe wall of the inner pipe, the through grooves are used for the rollers to pass through in a rolling mode, the rollers abut against the outer pipe through the through grooves, and the through grooves correspond to the rollers. And the inner pipe is pushed and pulled to drive the roller to move on the inner wall of the outer pipe through the through groove, so that the inner pipe is telescopically arranged relative to the outer pipe. According to the connecting structure and the trolley, the technical problem that a telescopic sleeve rod type connecting structure in the prior art is prone to shaking in the transportation process is solved.

The one-way valve adjusting device comprises a valve body, a water inlet and a water outlet, the left side of the valve body is provided with the water inlet, the top of the valve body is provided with the water outlet, the interior of the valve body is fixedly connected with a first pipe, the right side of the first pipe is provided with a second pipe, the interior of the first pipe is provided with a sealing body, and the sealing body is fixedly connected with the valve body. The right side of the sealing body is fixedly connected with a spring, the right side of the spring is fixedly connected with a push plate, the right side of the push plate is fixedly connected with an L-shaped push-pull rod, water enters the valve body through the water inlet, enters the second pipe from the first pipe, pushes the sealing body to move, enables the spring to contract, and is discharged from the water outlet. The L-shaped push-pull rod is pushed and pulled to drive the push plate to move left and right in the valve body, and the adjusting device is arranged on the outer side of the valve body, so that the valve body can be maintained regularly, the service life of the valve body is prolonged, and convenience is brought to overhaul work of the valve body.

The invention relates to a manual push-pull type mechanical spare wheel carrier system, and belongs to the technical field of automobile equipment. The mechanical spare wheel carrier system comprises two parallel guide rails, a frame-shaped spare wheel carrier and a fixed bracket, the two guide rails are assembled on the lower portion of a container bottom plate of the vehicle, the frame-shaped spare wheel carrier is connected to the two guide rails in a sliding mode and can be pushed and pulled front and back along the guide rails, and a positioning device is arranged between the frame-shaped spare wheel carrier and the vehicle. And the fixed bracket is assembled on the frame-shaped spare wheel carrier. The manual push-pull type mechanical spare wheel carrier system is convenient and labor-saving to apply, the space below a vehicle container is fully utilized, and the spare wheel is simple, convenient and rapid to fix.

The application discloses a lock, and belongs to the technical field of locks.The lock comprises a cover, a base, a rotating wheel, a dialing assembly, an elastic member, a handle and two racks, a supporting frame with a second spherical surface is fixedly arranged in the base, a first spherical surface matched with the second spherical surface is arranged on the outer side of a dialing main body of the dialing assembly, so that the dialing assembly can realize universal movement; the rotating wheel is provided with a gear structure, the two racks are arranged on the two sides of the rotating wheel and are meshed with the rotating wheel, a transmission part is arranged on the rack, and a dialing block of the dialing assembly abuts against the transmission part to push the rack to slide.The application relies on a spherical surface matching structure, integrates two unlocking modes of twisting and pushing and pulling, can also realize multi-angle linkage unlocking, has few overall components, a compact structure, is convenient to assemble and overhaul, is not prone to jamming during operation, has a good operation feeling, and is suitable for a wide range of applications.

The push-pull pallet fork comprises an upper fork assembly, a middle fork assembly and a lower fork assembly, the upper fork assembly, the middle fork assembly and the lower fork assembly are sequentially and coaxially connected, the upper fork assembly and the middle fork assembly are driven by the lower fork assembly to move in the axis direction, and the upper fork assembly pushes and pulls a pull-type tray; the middle fork assembly is in transmission connection with the lower fork assembly through a rack, and the upper fork assembly is in transmission connection with the middle fork assembly through a chain. A buffering device is installed on the lower fork assembly, and when the chain is broken, the middle fork assembly makes contact with the buffering device and decelerates under the action of the buffering device. The push-and-pull pallet fork comprising the buffer device transports goods in a push-and-pull mode, does not bear load and is not prone to being damaged due to long-term load bearing. According to the push-and-pull pallet fork comprising the buffer device, the buffer device is arranged, so that the fork body is prevented from being disengaged due to chain breakage, and the loss during failure is reduced.

The utility model discloses a material push -and -pull device for down -fall type internal mixer, including support platform frame, material side baffle, bottom plate, support column, push -and -pull device, limiting device and material receiving device, and push -and -pull device includes mounting bracket, motor, screw rod, threaded slide bar and inclined baffle, and limiting device includes T -shaped runner and T -shaped sliding block, and material receiving device includes electric telescopic handle, fixed plate and material receiving groove. The utility model belongs to internal mixer technical field, and specifically refers to a material push -and -pull device for down -fall type internal mixer. Effectively solve the problem of the traditional device adjusting multiple movable plate trouble, inconvenient use. It is a novel modernization material push -and -pull device for down -fall type internal mixer.

The utility model discloses horizontal push-pull force and pre-pressure detection integrated motor detection equipment, and particularly relates to the technical field of motor detection equipment, which comprises a driving assembly, a push-pull force display assembly, a limiting assembly and a pre-pressure test assembly, a push-pull force display assembly is installed on the side, away from the driving assembly, of the limiting assembly, a pre-pressure testing assembly is placed above the limiting assembly, the driving assembly comprises a first air cylinder, a push rod and a first connecting rod, and the push rod is installed on the side face of the first air cylinder; a multifunctional test can be performed on the motor through the push-pull force display assembly and the pre-pressure test assembly, the push-pull force display assembly can test the horizontal push-pull force of the motor, and the pre-pressure test assembly can extrude the upper surface of the motor, so that the motor can be subjected to multi-functional test. Therefore, the pre-pressure in the motor is tested.

The present application relates to the technical field of drawer slide rail, in particular to a drawer side edge stabilizer, the connecting plate between the mounting rod and the first slide rail shell, and the mounting seat connected with the second slide rail shell are all made of elastic material, so that when the drawer is deflected due to uneven force, the connecting plate and the mounting seat can simultaneously produce elastic deformation, so that the synchronous pulley and the synchronous belt are deflected synchronously, which is beneficial to adaptively compensate for the deformation deviation of the slide rail, and helps to ensure that the synchronous pulley and the synchronous belt always maintain a stable meshing state during relative motion, effectively solving the problem that the existing drawer is prone to deflection during pushing and pulling due to uneven force.

This utility model discloses a hydraulic pump with a capsule-type pumping mechanism, relating to the field of hydraulic pump technology. The utility model includes a housing, with a fixing plate fixedly connected to the front side of the housing via a second bolt. A capsule push-pull plate is movably connected to the rear side of the fixing plate via a guide rod. This utility model drives the capsule push-pull plate to move back and forth via a drive shaft, reciprocatingly pushing and pulling the pumping capsule. This allows liquid to be drawn into the pumping capsule from the inlet branch pipe and pumped out from the outlet branch pipe. The structure is simpler and easier to assemble and process. The ball bearings convert the sliding friction between the capsule push-pull plate and the pumping mechanism into rolling friction, reducing resistance and wear between the plates. The roller sleeves convert the sliding friction between the connecting column and the T-shaped connecting bracket into rolling friction, further reducing resistance and wear and extending the service life of the hydraulic pump.

The utility model belongs to the technical field of air circulation control, in particular to a push-pull air tap, which comprises an air tap, a colloid mounting ring, a connecting strap and a sealing cover, the colloid mounting ring is arranged on the periphery of the air tap, the connecting strap is arranged on the outer side of the air tap, and the sealing cover is arranged at the side end of the connecting strap. By arranging the displacement adjusting frame, the positioning frame, the sealing gasket, the flexible connecting strip and the push-pull block, when gas needs to be supplemented, the push-pull block is pulled out, and the flexible connecting strip drives the sealing gasket to be tightly attached to the bottom of the positioning frame. At the moment, inflation equipment is aligned with the air tap, and the air can lift the sealing gasket and enter the air containing structure. If gas needs to be exhausted, the push-pull block is pressed, the push-pull block enables the sleeve to penetrate through the through groove in the middle of the positioning frame through connection of the sleeve and the flexible connecting strip, so that the sealing gasket is pushed inwards and does not make contact with the bottom of the positioning frame, at the moment, the one-way through opening is changed into the two-way through opening, and the gas in the gas containing structure is rapidly exhausted from the gas nozzle.

To provide a head unit which facilitates lifting and pushing / pulling.SOLUTION: A head unit has a connector, a driving board, a fan, a tube connection part, a liquid discharge head, a housing which stores the driving board and the fan, and is provided with a first vent hole and a second vent hole, a first gripping part and a second gripping part, wherein the connector and the first vent hole are provided on a first surface of the housing, the tube connection part is provided on a second surface of the housing, the second gripping part is provided on a second surface of the housing, the liquid discharge head is provided on a third surface of the housing, the first gripping part is provided on a fourth surface of the housing, the second vent hole is provided at a visible position when being viewed from a normal direction of the second surface, and the shortest distance between the second gripping part and the fourth surface is shorter than the shortest distance between the tube connection part and the fourth surface, and is shorter than the shortest distance between the second vent hole and the fourth surface.SELECTED DRAWING: Figure 4

A telescopic overhanging discharging platform belongs to the technical field of building construction and comprises a steel beam frame, a movable supporting table is arranged on the steel beam frame, the bottom of the supporting table is connected with a first telescopic plate and a second telescopic plate which can move in the length direction of the supporting table, and a rotatable two-way screw is arranged in the center of the bottom of the supporting table. Two fixing blocks which are symmetrically arranged relative to the center line of the two-way screw rod are in threaded connection with the two-way screw rod, push-pull arms are rotationally connected to the two side walls of each fixing block, and the other ends of the push-pull arms are rotationally connected with the side walls of the first telescopic plate and the second telescopic plate correspondingly. According to the utility model, the push-pull arm rotates to push and pull the first telescopic plate and the second telescopic plate to move at the same time, so that the first telescopic plate and the second telescopic plate are close to each other or far away from each other, the telescopic length of the supporting table can be adjusted, and the length of a cantilever part can be flexibly adjusted under the condition that the anchoring length in the structure meets the requirement; and different building construction requirements are greatly met.

The utility model discloses a wooden storage sofa bed structure convenient to push and pull, which comprises a mounting frame, a connecting rod mounted on the inner side of the mounting frame, a side plate at one end of the mounting frame, a partition plate mounted at one end of the mounting frame, a guide rod mounted at one end of the partition plate, and a storage structure mounted on one side of the partition plate, a baffle is installed at the top end of the guide plate, and a drawer is installed on one side of the baffle. The drawer is installed at the top end of the guide plate, the drawer and the guide plate form a sliding structure, the drawer can slide at the top end of the guide plate, the baffle can be grasped to be pulled out of the drawer, then various articles can be placed in the drawer to be stored, the drawer can be pushed into the guide plate after being stored, and the baffle and the partition plate are tightly combined. And when the drawer needs to be drawn out, the bottom end of the baffle can be grasped to draw out the drawer for use, so that the purpose that the sofa bed structure is convenient to increase the storage space is achieved.

According to the technical scheme, the adjustable super calender is characterized in that the adjustable super calender comprises a supporting frame, two first bearing seats are fixedly installed on the top face of the supporting frame, and a fixed roller shaft is arranged between the two first bearing seats in a sleeved mode; during use, a first air cylinder can be started to push and pull a connecting frame to drive two second bearing seats to move synchronously, so that a pull roller shaft can be pushed to be close to or away from a fixed roller shaft, the aim of adjusting the distance is achieved, a driving motor can be started to drive a first worm to rotate, and then a first worm wheel is driven to rotate, so that the effect of rotating the fixed roller shaft is achieved; during use, when the first worm rotates, a connecting rod and a second worm are driven to rotate, a second worm gear and a movable roll shaft are driven to rotate, the effect of synchronous rotation is achieved, meanwhile, the second worm can be driven to move along with the position of the movable roll shaft to be adjusted through sleeving connection of the connecting rod and a clamping groove, and the work efficiency is improved. And the second worm can be adjusted along with the position movement of the movable roll shaft by starting the second air cylinder to push and pull the second worm, so that the convenience is increased.

The utility model relates to the technical field of tricycles, in particular to a rear seat push-pull structure and a tricycle, which comprise a front seat, a rear seat, a guide mechanism and a locking mechanism, the front seat is fixedly arranged at one end of the guide mechanism, the rear seat is arranged at the other end of the guide mechanism, and the rear seat can move in the extending direction of the guide mechanism; a sliding gap is formed between the upper top wall of the front seat and the outer bottom wall of the rear seat; the locking mechanism is arranged on the rear seat, can move in the height direction of the rear seat and is used for locking the rear seat to the guide mechanism. According to the rear seat push-and-pull structure and the tricycle using the rear seat push-and-pull structure, the process of push-and-pull adjustment of the rear seat can be simpler and more convenient, operation is simpler, and then the using feeling of a user is improved.

The invention discloses a universal cycloid spindle blade rotor lifting device, and relates to the technical field of unmanned aerial vehicles. The universal cycloid spindle paddle rotor wing lifting device comprises a shell, a main shaft, a main taper sleeve, a main paddle, an auxiliary paddle and a universal adjusting mechanism. The universal adjusting mechanism comprises a conical fluted disc, a paddle connecting shaft, a driven bevel gear, an electromagnetic telescopic sleeve A, an electromagnetic telescopic sleeve B and a driving control module; the main paddle and the auxiliary paddle are installed at the two ends of the paddle connecting shaft, each paddle is of a spindle-shaped structure with the surface being a cycloid curved surface, the middle of each paddle is thickened, and the edge of each paddle is provided with a flow guide edge protruding outwards. The driving control module controls the two groups of electromagnetic telescopic sleeves to synchronously push and pull to force the paddle connecting shaft to axially translate so as to drive the driven bevel gear to be instantly meshed with or separated from the bevel gear disc on the main shaft; transient micro-adjustment of the attack angle of the blade is achieved through a pure mechanical structure of rigid meshing of the electromagnetic clutch and the gear, the cycloid gradual change pneumatic curved surface is matched, response delay is effectively overcome, blade tip vortex is restrained, and the anti-crosswind stability and the heavy load structure rigidity under complex turbulence are improved.

The application relates to a metal push-pull self-locking connector, a plug comprising a plug main body and a first pair of plug structure members, and a socket comprising a socket main body and a second pair of plug structure members; a metal sleeve of the plug main body is inserted with a metal shell of the socket main body, and a spring sheet claw at the end of the metal sleeve is elastically accommodated in a key position slot of the metal shell; the first pair of plug structure members are inserted in the metal sleeve, the second pair of plug structure members are inserted in the metal shell, and the first pair of plug structure members are inserted with the second pair of plug structure members to form a plug-in connection structure. On one hand, the metal sleeve and the metal shell are pushed and pulled to be self-locked through the cooperation of the spring sheet claw and the key position slot; on the other hand, the design of the plug-in connection structure makes the key connection part also form an integral plug-in structure, and a close plug-in relationship is formed; on the other hand, the structure is simple, mass production is facilitated, the fixing mode is simple and firm, and the metal push-pull self-locking connector is suitable for use in harsh environments, small spaces, standard air pressure or low air pressure environments lower than the standard air pressure.

The utility model relates to the technical field of concrete detection equipment, and discloses a concrete test block size detection device which comprises a main ruler, one end of the main ruler is respectively and fixedly provided with a first outer measuring claw and a first inner measuring claw, and the main ruler below the first outer measuring claw is movably provided with a vernier. One end of the vernier is fixedly provided with a second outer measuring claw and a second inner measuring claw. The vernier below the second outer measuring claw is fixedly provided with a push block. The push block is provided with the vernier pusher, and the vernier pusher is composed of a first push-pull wheel, a second push-pull wheel, a first rotating shaft, a first guide disc, a second rotating shaft, a second guide disc, an ejector rod, a rotating ball and the like, so that the vernier can be pushed and pulled to move on the main ruler by means of the whole vernier pusher; and through cooperation of the adjusting block, the stud and the ejector rod, the abutting pressure of the rotating ball and the contact surface of the main ruler can be achieved, so that real-time limiting of the movement of the vernier is facilitated, the offset of the vernier during operation is reduced, and the accuracy of measured data is improved.