Embedded air compressor controller convenient to quickly clamp and fix
The combination design of the embedded frame and the fixing plate enables quick locking and easy disassembly of the air compressor controller, solving the problem of inconvenient installation and maintenance of traditional controllers and improving its practicality.
Patent Information
- Application Number
- CN202422462517.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-10-12
AI Technical Summary
Existing air compressor controllers are not convenient to install and maintain, especially the traditional bolt fixing, which makes it difficult to disassemble and repair quickly. In addition, the controller wires are prone to hanging during maintenance, which affects practicality.
It adopts a combination design of embedded frame, fixing plate, ejection component and embedded component, and achieves quick snap-fit fixation and convenient disassembly through the cooperation of inclined embedding port and sleeve hole, avoiding the suspension of wires.
It improves the ease of installation and maintenance of the controller, ensures that the wires do not dangle during maintenance, facilitates two-handed operation, and enhances practicality.
Smart Images

Figure CN223528300U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to an air compressor controller, in particular to an embedded air compressor controller convenient for quick clamping and fixing. BACKGROUND
[0002] There are many types of air compressors, which can be divided into volumetric compressors, reciprocating compressors, centrifugal compressors according to working principles. The working principle of the volumetric compressor is to compress the volume of the gas, so that the density of the gas molecules in the unit volume increases to increase the pressure of the compressed air. The air compressor is generally controlled by a controller to control its operation. The controller is a master device that controls the start, speed regulation, braking and reverse of the motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit according to the predetermined sequence. It is composed of program counter, instruction register, instruction decoder, time sequence generator and operation controller. It is the "decision-making mechanism" that issues commands, i.e. coordinates and commands the operation of the entire computer system;
[0003] For the authorized announcement number CN 218735365 U, a kind of embedded air compressor controller convenient for quick clamping and fixing, the utility model can limit the embedding installation position of controller main body by the mutual cooperation between the limiting block and limiting plug post of being set, the clamping and fixing process of controller main body can be quickly realized by the mutual cooperation between the connecting block one, connecting block two, pressing assembly and clamping assembly of being set, when controller main body appears damage and needs to be repaired, it can be conveniently removed, effectively solve the condition that the traditional controller is mostly fixed by bolt, and then it is difficult to quickly disassemble and repair, the controller main body is pushed to move a certain distance forward in the process of being taken out by the mutual cooperation between the telescopic link, spring one, T-shaped sliding block, T-shaped sliding slot and L-shaped push plate of being set, so that the taking-out process of controller main body becomes more convenient, the controller main body clamped and fixed inside embedding installation block can be protected by the opening and closing plate;
[0004] When the above-mentioned controller is embedded and installed, it needs to be sleeved with the limiting block and the limiting plug post first, then the pressing plate is pulled upward to make the trapezoidal push block disengage from the trapezoidal block, then the controller is pressed to make the connecting block two and the clamping block two correspondingly sleeved, so that the installation process is not convenient. When it needs to be repaired, the controller is separated from the limiting plug post, so that the controller is in a suspended state relying on the connected wire, so that the maintenance personnel need to hold the controller with one hand and perform maintenance operation with the other hand, so that it is inconvenient to maintain, thereby reducing its practicability. UTILITY MODEL CONTENTS
[0005] The utility model discloses a purpose lies in providing a kind of embedded air compressor controller of quick and easy to engage and fix to solve the problem raised in the above background art.
[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of embedded air compressor controller of quick and easy to engage and fix, including embedded frame, the embedded frame is connected with two upper and lower symmetrical push-out components and embedded component, the front side upper end of the embedded frame is movably connected with cover plate by hinged seat, glass plate is provided on the cover plate, the bottom surface of the cover plate is fixedly connected with rubber frame.
[0007] As a preferred technical scheme of the utility model, the left and right sides of the embedded frame are fixedly connected with fixed plate one, two the fixed plate one are all provided with two pin hole, the left and right side plates of the embedded frame are all provided with two sleeve holes two, the inside of the embedded frame is fixedly connected with two fixed plates two, the rectangular hole one corresponding to the rear side of the embedded frame is set between the two fixed plates two, two the fixed plate two are all provided with two sleeve holes one, the opposite side of the two fixed plates two is all provided with two embedding entrances, four the embedding entrances are respectively intercommunicated with four sleeve holes one, four the embedding entrances are two groups and the opposite side of two groups is all set as mutually symmetrical inclined surface, the shape of two the embedding entrances of upper side group is set as arc shape that is inclined downward.
[0008] As a preferred technical scheme of the utility model, the upper and lower sides of the embedded frame are fixedly connected with fixed sleeve plate and n-shaped fixed plate respectively, the opening rectangular hole two provided in the lower side plate of the embedded frame corresponds with n-shaped fixed plate, the upper and lower side plates of the embedded frame are all provided with two movable holes, wherein the inside of two corresponding movable holes on the right side is all fixedly connected with fixed column one.
[0009] As a preferred technical scheme of the utility model, two the push-out components all include two mobile columns, two the mobile columns are respectively sleeved with two sleeve holes two of same horizontal plane, two the mobile columns are respectively fixedly connected with two fixed rings, the opposite side of two the fixed rings is respectively fixedly connected with the opposite end of two spring one, the opposite end of two the spring one is respectively fixedly connected with the opposite side of two fixed plates two, the opposite end of two the mobile columns is respectively left-right corresponding with two sleeve holes one of same horizontal plane, the left end upper side of the L-shaped push-pull plate is fixedly connected with the left side fixed ring, the L-shaped push-pull plate is sleeved with one movable hole on the left side, the right end of the L-shaped push-pull plate is fixedly connected with lug plate, the L-shaped push-pull plate is sleeved with rectangular hole four provided in fixed sleeve plate or rectangular hole five provided in n-shaped fixed plate upper.
[0010] As a preferred technical scheme of the utility model, the lower side plate upper surface of the L-shaped push-pull plate is movably connected with the lower end of the movable plate through the hinge seat, the movable plate is connected with the rectangular hole in the rotating plate, the rotating plate is connected with one of the fixed columns through the oval hole one, the rotating plate is connected with one of the movable holes on the right side, the front and back sides of the rotating plate are fixedly connected with the two push-in sleeve plates, the two push-in sleeve plates are connected with the two ends of the fixed column two through the oval hole two, and the fixed column two is fixedly connected with the right side fixed ring.
[0011] As a preferred technical scheme of the utility model, the embedded part comprises two fixed blocks, the two fixed blocks are fixedly connected with the controller body, the controller body and the two fixed blocks are rotationally corresponding with the two fixed plates two, the two fixed blocks are provided with left-right penetrating sleeve holes three, the upper surfaces of the two fixed blocks are provided with grooves, the two grooves are communicated with the two sleeve holes three respectively, and the two sleeve holes three are sleeved with two clamping columns.
[0012] As a preferred technical scheme of the utility model, the opposite ends of the two clamping columns corresponding to the left and right are sleeved with the two sleeve holes one respectively, the opposite end sides of the two clamping columns corresponding to the left and right are fixedly connected with the two ends of the spring two respectively, the opposite end sides of the two clamping columns corresponding to the left and right are fixedly connected with the limiting plates respectively, and the four limiting plates are divided into two groups, and the two groups are sleeved in the two grooves respectively.
[0013] Compared with the prior art, the utility model has the advantages that:
[0014] 1、The embedded frame, the fixed plate two, the sleeve hole two, the embedding entrance, the push-out part and the embedded part are used in cooperation, the two clamping columns on the rear side of the embedded part are correspondingly pushed into the two embedding entrances on the lower side, the side surfaces of the two clamping columns on the rear side are limited to move close to each other by the inclined surfaces of the embedding entrances, the spring two is pressed, then the two clamping columns on the rear side are sleeved in the two sleeve holes one on the lower side, the spring two pushes the two clamping columns into the two sleeve holes one on the lower side, the rear end of the embedded part is sleeved and fixed, the embedded part is rotated under the sleeving and rotating support of the sleeve hole one and the clamping column on the lower side, the two clamping columns on the upper side are sleeved in the two sleeve holes one on the upper side, the embedded part is sleeved in the two fixed plate two and the embedded frame, the embedded part is only pressed to be clamped and embedded, and the installation convenience is improved.
[0015] 2, the utility model discloses a set up the cooperation of embedded entrance, push out spare, embedded spare, when needing to maintain embedded spare, can pull the ear plate on the upper side push out spare and move to the right side, and the ear plate drives L-shaped push -pull board and left side fixed ring and mobile column and move to the right side, and L-shaped push -pull board also drives movable plate and stretches out in rotating board and drives its rotation to make rotating board rotate and drive two push sleeve board to rotate under the support of fixed column no. One, and two push sleeve board drives fixed column no. Two and moves in oval hole no. Two, so that fixed column no. Two drives right side fixed ring and mobile column and moves to the left side, so can make two mobile columns close to each other and move the clamping column in two sleeve holes no. One and push out sleeve hole no. One, so convenient for the upper side of embedded spare is released from the sleeve connection limit, then can pull out the upper side of embedded spare, and the lower side clamping column of embedded spare also rotates in lower side sleeve hole no. One, so can make embedded spare support and rotate, thereby avoiding the connection wire connection in the state of suspension, thereby convenient for supporting on n-shaped fixed plate and maintaining with both hands, thereby convenient for maintaining, improve its practicality. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the front view structural schematic diagram of the utility model;
[0017] Figure 2 It is the embedded frame structural schematic diagram of the utility model;
[0018] Figure 3 It is the embedded frame plan view structural schematic diagram of the utility model;
[0019] Figure 4 It is the push out spare structural schematic diagram of the utility model;
[0020] Figure 5 It is the embedded spare structural schematic diagram of the utility model.
[0021] In the drawing: 1 embedded frame, 101 fixed plate no. One, 102 fixed plate no. Two, 103 embedded entrance, 104 sleeve hole no. One, 105 sleeve hole no. Two, 106 fixed sleeve board, 107 n-shaped fixed plate, 108 movable hole, 109 fixed column no. One, 2 push out spare, 21 mobile column, 22 fixed ring, 23 spring no. One, 24 L-shaped push -pull board, 25 ear plate, 26 movable plate, 27 rotating board, 28 push sleeve board, 29 fixed column no. Two, 3 embedded spare, 31 fixed block, 32 recess, 33 sleeve hole no. Three, 34 clamping column, 35 limit board, 36 spring no. Two, 37 controller body, 4 cover plate, 5 glass plate, 6 rubber frame. DETAILED DESCRIPTION
[0022] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0023] Please refer to Figures 1-5 The utility model provides a kind of embedded air compressor controller of quick clamping fixed technical scheme: including embedded frame 1, embedded frame 1 is connected with two upper and lower symmetrical push-out component 2 and embedded component 3, the front side upper end of embedded frame 1 is movably connected with cover plate 4 by hinged seat, glass plate 5 is provided on cover plate 4, the bottom surface of cover plate 4 is fixedly connected with rubber frame 6.
[0024] The left and right sides of embedded frame 1 are fixedly connected with fixed plate one 101, two fixed plate one 101 are provided with two pin hole, the left and right side plates of embedded frame 1 are provided with two sleeve holes two 105, the inside of embedded frame 1 is fixedly connected with two fixed plate two 102, the rectangular hole one corresponding to the back side of embedded frame 1 is set between two fixed plate two 102, two fixed plate two 102 are provided with two sleeve holes one 104, the opposite side of two fixed plate two 102 is provided with two embedding entrances 103, four embedding entrances 103 are respectively communicated with four sleeve holes one 104, four embedding entrances 103 are two groups and the opposite side of two groups is provided as mutually symmetrical inclined surface, the shape of the two embedding entrances 103 of upper side group is set as downward inclined arc, convenient for when embedding component 3 rotates to link and enter, to facilitate the extrusion of clamping column 34 and move into sleeve hole one 104 and be fixed.
[0025] The upper and lower sides of embedded frame 1 are fixedly connected with fixed sleeve plate 106 and n-shaped fixed plate 107 respectively, the opening rectangular hole two provided in the lower side plate of embedded frame 1 corresponds with n-shaped fixed plate 107, the upper and lower side plates of embedded frame 1 are provided with two movable holes 108, and the inside of the right side upper and lower corresponding two movable holes 108 is fixedly connected with fixed column one 109.
[0026] Two push-out components 2 each include two moving columns 21, which are respectively sleeved with two sleeve holes two 105 of the same horizontal plane, and are respectively fixedly connected with two fixed rings 22. The opposite sides of the two fixed rings 22 are respectively fixedly connected with opposite ends of two springs one 23, and the opposite ends of the two springs one 23 are respectively fixedly connected with opposite sides of two fixed plates two 102. The opposite ends of the two moving columns 21 are respectively correspondingly sleeved with two sleeve holes one 104 of the same horizontal plane. The left fixed ring 22 is fixedly connected with the left end of the upper side of the L-shaped push-pull plate 24. The L-shaped push-pull plate 24 is sleeved with one of the left movable holes 108. The right end of the L-shaped push-pull plate 24 is fixedly connected with the lug plate 25. Pulling the lug plate 25 on the upper side of the push-out component 2 to move to the right side, the lug plate 25 drives the L-shaped push-pull plate 24, the left fixed ring 22 and the moving column 21 to move to the right side. At the same time, the L-shaped push-pull plate 24 also drives the movable plate 26 to extend in the rotating plate 27 and drives the rotating plate 27 to rotate, so that the rotating plate 27 drives the two push sleeves 28 to rotate under the support of the fixed column one 109. The two push sleeves 28 drive the fixed column two 29 to move in the oval hole two, so that the fixed column two 29 drives the right fixed ring 22 and the moving column 21 to move to the left side. In this way, the two moving columns 21 can move close to each other to push out the clamping column 34 in the sleeve hole one 104. In this way, the upper side of the embedded component 3 can be conveniently disengaged from the sleeve connection limitation. Then, the lower side of the push-out component 2 is also operated, so that the embedded component 3 can be taken out for maintenance or replacement. The L-shaped push-pull plate 24 is sleeved with the rectangular hole four of the fixed sleeve plate 106 or the rectangular hole five of the n-shaped fixed plate 107.
[0027] The lower plate upper surface of the L-shaped push-pull plate 24 is movably connected with the lower end of the movable plate 26 through the hinge seat. The movable plate 26 is sleeved with the rectangular hole three of the rotating plate 27. The rotating plate 27 is sleeved with one of the fixed column one 109 through the oval hole one. The rotating plate 27 is sleeved with one of the movable holes 108 on the right side. The front and rear sides of the rotating plate 27 are respectively fixedly connected with the two push sleeves 28. The two push sleeves 28 are respectively sleeved with the two ends of the fixed column two 29 through the oval hole two. The fixed column two 29 is fixedly connected with the right fixed ring 22.
[0028] The embedded part 3 comprises two fixed blocks 31, the two fixed blocks 31 are fixedly connected between a controller body 37, the controller body 37 is rotationally corresponding with the two fixed blocks 31 and the two fixed plates two 102, the two fixed blocks 31 are both provided with left-right penetrating sleeve holes three 33, the upper surfaces of the two fixed blocks 31 are both provided with grooves 32, the two grooves 32 are respectively communicated with the two sleeve holes three 33, the two sleeve holes three 33 are both sleeved with two clamping columns 34, the two clamping columns 34 on the rear side of the embedded part 3 are respectively corresponding with the two embedding entrances 103 on the lower side and are pushed in, so that the side surfaces of the two clamping columns 34 on the rear side are limited to move close to each other by the inclined surfaces of the embedding entrances 103, so that the spring two 36 is extruded, then the two clamping columns 34 on the rear side slide through the two embedding entrances 103 on the lower side and are sleeved into the two sleeve holes one 104 on the lower side, at the same time, the spring two 36 pushes the two clamping columns 34 into the two sleeve holes one 104, so that the rear end of the embedded part 3 is fixedly limited.
[0029] The opposite ends of the two clamping columns 34 corresponding to the left and right are respectively sleeved with the two sleeve holes one 104 on the lower side, the opposite end side surfaces of the two clamping columns 34 corresponding to the left and right are respectively fixedly connected with the two ends of the spring two 36, the opposite end side surfaces of the two clamping columns 34 corresponding to the left and right are both fixedly connected with the limiting plates 35, by the limiting plates 35, the rotation of the clamping column 34 can be placed, at the same time, the clamping column 34 is prevented from extending too much, which is not convenient for corresponding embedding with the embedding entrance 103 to extrude and move, the four limiting plates 35 are two by two in a group and the two groups are respectively sleeved with the two grooves 32.
[0030] The operation steps of the utility model are as follows:
[0031] The two clamping columns 34 on the rear side of the embedded part 3 are respectively corresponding with the two embedding entrances 103 on the lower side and are pushed in, so that the side surfaces of the two clamping columns 34 on the rear side are limited to move close to each other by the inclined surfaces of the embedding entrances 103, so that the spring two 36 is extruded, then the two clamping columns 34 on the rear side slide through the two embedding entrances 103 on the lower side and are sleeved into the two sleeve holes one 104 on the lower side, at the same time, the spring two 36 pushes the two clamping columns 34 into the two sleeve holes one 104, so that the rear end of the embedded part 3 is fixedly limited, then the embedded part 3 is pushed to rotate under the sleeving and rotating support of the clamping column 34 on the lower side and the sleeve hole one 104, so that the two clamping columns 34 on the upper side slide through the two embedding entrances 103 on the upper side and are sleeved with the two sleeve holes one 104 on the upper side, so that the whole embedded part 3 is sleeved in the two fixed plates two 102 and the embedding frame 1;
[0032] When the embedded part 3 needs to be repaired, the ear plate 25 on the upper side push-out part 2 can be pulled to move to the right side, the ear plate 25 drives the L-shaped push-pull plate 24 and the left side fixed ring 22 and the moving column 21 to move to the right side, at the same time, the L-shaped push-pull plate 24 also drives the movable plate 26 to extend in the rotating plate 27 and drives the rotating plate 27 to rotate under the support of the fixed column one 109, and drives the two push sleeve plates 28 to rotate, the two push sleeve plates 28 drive the fixed column two 29 to move in the elliptical hole two, so that the fixed column two 29 drives the right side fixed ring 22 and the moving column 21 to move to the left side, so that the two moving columns 21 are close to each other and move the clamping column 34 in the sleeve hole one 104 out of the sleeve hole one 104, so that the upper side of the embedded part 3 is conveniently released from the sleeve connection, and then the upper side of the embedded part 3 can be pulled out, and at the same time, the lower side clamping column 34 of the embedded part 3 also rotates in the lower side sleeve hole one 104, so that the embedded part 3 is supported and rotated, so that the connected wire connection is in a suspended state, thereby facilitating the two-handed repair of the embedded part 3 supported on the n-shaped fixed plate.
[0033] In the description of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.
[0034] In the present application, unless otherwise explicitly specified and limited, for example, it can be fixedly connected, or can be detachably connected, or can be integrated; it can be mechanically connected, or can be electrically connected; it can be directly connected, or can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the above-mentioned terms can be understood according to the specific meaning in the present application by the person skilled in the art according to the specific situation.
[0035] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. An embedded air compressor controller for easy and quick snap fixing comprising an embedded frame (1) characterized by: The embedded frame (1) is connected with two upper and lower symmetric push-out components (2) and embedded components (3), the front side upper end of the embedded frame (1) is movably connected with a cover plate (4) through a hinge seat, a glass plate (5) is arranged on the cover plate (4), and the bottom surface of the cover plate (4) is fixedly connected with a rubber frame (6).
2. An embedded air compressor controller for quick snap-in fixation according to claim 1, characterized in that: The left and right sides of the embedded frame (1) are fixedly connected with fixed plates one (101), two pin shaft holes are formed in the two fixed plates one (101), two sleeve holes two (105) are formed in the left and right side plates of the embedded frame (1), two fixed plates two (102) are fixedly connected inside the embedded frame (1), the two fixed plates two (102) correspond to the rectangular hole one formed in the rear side of the embedded frame (1), two sleeve holes one (104) are formed in the two fixed plates two (102), two embedding entrances (103) are formed in the opposite sides of the two fixed plates two (102), the four embedding entrances (103) respectively communicate with the four sleeve holes one (104), the four embedding entrances (103) are arranged in two groups, the opposite sides of the two groups are arranged as inclined surfaces that are symmetric to each other, and the shapes of the two embedding entrances (103) in the upper side group are arranged as downwardly inclined arcs.
3. An embedded air compressor controller for quick snap-in fixation according to claim 1, characterized in that: The upper and lower sides of the embedded frame (1) are fixedly connected with fixed sleeve plates (106) and n-shaped fixed plates (107), the opening rectangular hole two formed in the lower side plate of the embedded frame (1) corresponds to the n-shaped fixed plate (107), and two movable holes (108) are formed in the upper and lower side plates of the embedded frame (1), wherein the fixed column one (109) is fixedly connected inside the two movable holes (108) corresponding to the upper and lower sides on the right side.
4. An embedded air compressor controller for quick snap-in fixation according to claim 1, characterized in that: The two push-out components (2) each comprise two moving columns (21), the two moving columns (21) are respectively sleeved with the two sleeve holes two (105) in the same horizontal plane, the two moving columns (21) are fixedly connected with two fixed rings (22), the opposite sides of the two fixed rings (22) are fixedly connected with the opposite ends of two springs one (23), the opposite ends of the two springs one (23) are fixedly connected with the opposite sides of the two fixed plates two (102), the opposite ends of the two moving columns (21) correspond to the two sleeve holes one (104) on the same horizontal plane, the left end of the L-shaped push-pull plate (24) is fixedly connected with the left side of the left movable hole (108), the L-shaped push-pull plate (24) is sleeved with the rectangular hole four formed in the fixed sleeve plate (106) or the rectangular hole five formed in the n-shaped fixed plate (107), and the right end of the L-shaped push-pull plate (24) is fixedly connected with an ear plate (25).
5. An embedded air compressor controller for quick snap-in fixation according to claim 4, characterized in that: The lower side plate upper surface of the L-shaped push-pull plate (24) is movably connected with the lower end of the movable plate (26) through the hinge seat, the movable plate (26) is sleeved with the rectangular hole in the rotating plate (27), the rotating plate (27) is sleeved with one of the fixed columns (109) through the oval hole, the rotating plate (27) is sleeved with one of the movable holes (108) on the right side, the front and rear side surfaces of the rotating plate (27) are fixedly connected with the two push sleeve plates (28) respectively, the two push sleeve plates (28) are sleeved with the two ends of the fixed column (29) through the oval hole, and the fixed column (29) is fixedly connected with the right side fixed ring (22).
6. An embedded air compressor controller for quick snap-in fixation according to claim 1, characterized in that: The embedded part (3) comprises two fixed blocks (31), the two fixed blocks (31) are fixedly connected with the controller body (37) between the two fixed blocks (31), the controller body (37) and the two fixed blocks (31) are rotatably corresponded with the two fixed plates (102) between the two fixed blocks (31), the two fixed blocks (31) are provided with left and right through sleeve holes (33), the upper surfaces of the two fixed blocks (31) are provided with recesses (32), the two recesses (32) are communicated with the two sleeve holes (33) respectively, and the two sleeve holes (33) are sleeved with two clamping columns (34) respectively.
7. An embedded air compressor controller for quick snap-in fixation according to claim 6, characterized in that: The opposite ends of the two clamping columns (34) are sleeved with the two sleeve holes (104) respectively, the opposite end side surfaces of the two clamping columns (34) are fixedly connected with the two ends of the spring (36) respectively, the opposite end side surfaces of the two clamping columns (34) are fixedly connected with the limiting plates (35), the four limiting plates (35) are two groups, and the two groups are sleeved in the two recesses (32) respectively.