A fixing structure of high-frequency high-speed copper-clad plate

Abstract

The present application relates to the field of printed circuit, especially to a high-frequency high-speed copper-clad plate fixing structure, comprising a copper-clad plate base material and a plurality of electronic components arranged on the copper-clad plate base material, a lower plate frame is attached to the lower end face edge of the copper-clad plate base material, a lock plate pin extends from the upper end corner of the lower plate frame, the lock plate pin is inserted into the mounting hole at the four corners of the copper-clad plate base material, two clamping column half-rings are symmetrically arranged at the lower end two side edges of the lower plate frame, the arrangement spacing between the plurality of clamping column half-rings is adapted to the arrangement spacing of the circular protrusions at the bottom of the shell, and the diameter of the clamping column half-ring is adapted to the diameter of the circular protrusions at the bottom of the shell. The present application enhances the restriction on the copper-clad plate base material, avoids the deformation of the copper-clad plate base material, ensures normal use, facilitates installation, and can be used for electronic components with different distribution positions on the copper-clad plate base material, effectively improving the applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printed circuit, in particular to a fixing structure of high-frequency high-speed copper-clad plate. BACKGROUND

[0002] Printed circuit is a technology of forming conductive lines and connecting points on insulating substrate by specific process to realize electrical connection between electronic components, which is the core component of modern electronic equipment. High-frequency high-speed copper-clad plate is the substrate for manufacturing high-frequency high-speed printed circuit board, and its core advantage is to reduce the loss in high-frequency signal transmission, thereby enhancing the signal frequency and transmission rate of the printed circuit board.

[0003] After the high-frequency high-speed copper-clad plate is made into a printed circuit board, it is usually fixed by screws to fix the four corners of the copper-clad plate substrate, so that it is installed in the shell to be protected by the shell. This fixing method can only install rigid copper-clad plate substrates, and it is difficult to firmly limit the copper-clad plate substrate when installing some flexible copper-clad plate substrates, resulting in deformation of the copper-clad plate substrate after installation. Deformation will cause impedance changes, which will seriously affect the use. SUMMARY

[0004] The purpose of the present application is to solve the shortcomings in the background art and provide a fixing structure of high-frequency high-speed copper-clad plate.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a fixing structure of high-frequency high-speed copper-clad plate, comprising a copper-clad plate substrate and a plurality of electronic components arranged on the copper-clad plate substrate, a lower plate frame is attached to the lower end face edge of the copper-clad plate substrate, a lock plate pin is extended at the upper end corner of the lower plate frame, the lock plate pin is inserted into the mounting hole at the four corners of the copper-clad plate substrate, two card column half rings are symmetrically arranged at the lower end of both sides of the lower plate frame, the arrangement spacing between the plurality of card column half rings is adapted to the arrangement spacing of the circular protrusions at the bottom of the shell, the diameter of the card column half ring is adapted to the diameter of the circular protrusions at the bottom of the shell, an upper plate frame is elastically arranged above the lower plate frame, a plurality of top plate bridges are arranged on the lower end of the lower plate frame and the upper end of the upper plate frame, a plurality of pressing plate columns are arranged on the top plate bridges above and below, a column cap is coaxially fixed and installed on the lower end face of the pressing plate column above and the upper end face of the pressing plate column below, and an adaptive piece is arranged between the pressing plate column and the top plate bridge, and between the top plate bridge and the lower plate frame and the upper plate frame.

[0006] Preferably, a T-shaped stand is extended at the middle of the lower end of both sides of the lower plate frame, and the end of the T-shaped stand is fixed with the card column half ring.

[0007] Preferably, the upper end of the T-shaped stand is fixedly provided with a guide column shell, the inside of the guide column shell is coaxially and elastically provided with a pressing frame column, the pressing frame column penetrates out from the upper end of the guide column shell, the upper end of the pressing frame column is symmetrically and fixedly provided with two pressing frame display frames, the ends of the two pressing frame display frames are fixedly provided with bending frames, and the ends of the bending frames are fixed with the upper plate frame.

[0008] Preferably, the lower end of the pressing frame column is coaxially embedded with a positioning cap, the positioning cap is slidingly installed in the inside of the guide column shell, the inside of the guide column shell is fixedly provided with a separation spring on the bottom surface, and the upper end of the separation spring is fixed with the lower end of the positioning cap.

[0009] Preferably, the corners of the upper plate frame are provided with pin holes penetratingly formed, the pin holes are located above the lock plate pins, and the diameters of the pin holes are matched with the diameters of the lock plate pins.

[0010] Preferably, the adaptation part comprises T-shaped sliding strips extending at the front and rear edges of the lower end surface of the lower plate frame and the front and rear edges of the upper end surface of the upper plate frame, the two ends of the top plate bridge are slidingly installed on the outer surfaces of the T-shaped sliding strips, the horizontal section of the top plate bridge is provided with an adaptation sliding groove penetratingly formed, the inside of the adaptation sliding groove is slidingly installed with a I-shaped adaptation block, and one end of the I-shaped adaptation block is fixed with the pressing plate column.

[0011] Preferably, the two ends of the top plate bridge are hollowed to form bearing cavities, the inside of the bearing cavities is elastically installed with rubber pressing plates, the two ends of the top plate bridge are provided with T-shaped grooves penetratingly formed, the T-shaped grooves are in communication with the bearing cavities, the T-shaped sliding strips slidingly penetrate in the inside of the T-shaped grooves, the rubber pressing plates are pressed on the T-shaped sliding strips, the middle part of the end surface of the I-shaped adaptation block, which is opposite to the end surface where the pressing plate column is located, extends a square rib, the outer surface of the square rib is elastically installed with a rubber pressing cap, and the rubber pressing cap is pressed on the top plate bridge.

[0012] Preferably, the two sides of the rubber pressing cap extend finger blocks, the finger blocks are integrally formed with the rubber pressing cap, the end of the square rib is fixedly provided with a spring cap, the outer side of the square rib is wound with a first pressing spring, one end of the first pressing spring is fixed with the rubber pressing cap, the other end of the first pressing spring is fixed with the spring cap, the middle part of the rubber pressing plate extends a lifting column, the end of the lifting column penetrates out from the corner of the top plate bridge, the outer side of the lifting column is wound with a second pressing spring, one end of the second pressing spring is fixed with the rubber pressing plate, the other end of the second pressing spring is fixed with the inner wall of the bearing cavity, and the end of the lifting column symmetrically extends two column claws.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] 1、Put the copper-clad plate substrate in the shell, at this time the two sides two clamping column half ring just with the circular protrusion of the bottom of the shell clamping, to the copper-clad plate substrate positioning, then can be fixed on the shell shell cover, in the process of fixing, the shell cover will be extruded on the frame, in turn drive the upper plate frame down, to the copper-clad plate substrate around the lower plate frame, at the same time, the upper plate frame on the plurality of column cap will be extruded on the lower plate frame on the plurality of column cap in the middle of the copper-clad plate substrate, complete installation, in this way, through the upper plate frame, lower plate frame and the extrusion of a plurality of column cap, enhance the restriction of copper-clad plate substrate, to firmly fixed copper-clad plate substrate, avoid copper-clad plate substrate deformation, to ensure normal use, at the same time, in the process of installation, when the shell cover and the shell is closed, can be installed in the shell of copper-clad plate substrate, its process does not need to be fixed in the shell of copper-clad plate substrate, then close the shell cover and the shell, simple operation, effectively facilitate the installation.

[0015] 2、By pulling the column claw, can drive the rubber pressing plate pressed by the No. 2 compression spring to separate from the T-shaped slide bar, then can be actuated on the top plate bridge, so that the top plate bridge slides on the T-shaped slide bar, to adjust the left and right position of the column cap, and can be actuated on the finger block, so that the rubber pressing cover pressed by the No. 1 compression spring is separated from the top plate bridge, then can be actuated on the I-shaped adaptive block to slide in the adaptive sliding groove on the top plate bridge, to adjust the front and back position of the column cap, so as to change the distribution position of the plurality of column cap, to adapt to the use of electronic components with different distribution positions on the copper-clad plate substrate, so as to improve the applicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure diagram of the fixing structure of the high-frequency high-speed copper-clad plate of the application;

[0017] Figure 2 It is a partial view of the fixing structure of the high-frequency high-speed copper-clad plate of the application;

[0018] Figure 3 It is a structure diagram of the fixing structure of the high-frequency high-speed copper-clad plate of the application Figure 2 Enlarged view of A;

[0019] Figure 4 It is a sectional view of the lifting column of the fixing structure of the high-frequency high-speed copper-clad plate of the application;

[0020] Figure 5 It is an internal view of the guide column shell of the fixing structure of the high-frequency high-speed copper-clad plate of the application;

[0021] Figure 6 It is a schematic diagram of the I-shaped adaptive block of the fixing structure of the high-frequency high-speed copper-clad plate of the application;

[0022] Figure 7Use view of the fixing structure of the high-frequency high-speed copper-clad plate of the application;

[0023] Figure 8 The exploded view of the copper-clad plate base material and the shell of the fixing structure of the high-frequency high-speed copper-clad plate of the application.

[0024] In the figure: 1, copper-clad plate base material; 2, electronic component; 3, top plate bridge frame; 4, guide column shell; 5, clamping column half ring; 6, lock plate pin; 7, lower plate frame; 8, pressing frame column; 9, pressing frame exhibition frame; 10, bending fixed frame; 11, pin hole; 12, T-shaped sliding bar; 13, upper plate frame; 14, pull column; 15, adaptive sliding groove; 16, spring cap; 17, No. 1 pressing spring; 18, H-shaped adaptive block; 19, rubber gland; 20, pressing plate column; 21, column cap; 22, square edge; 23, finger block; 24, column claw; 25, No. 2 pressing spring; 26, bearing cavity; 27, rubber pressing plate; 28, positioning cap; 29, separation spring; 30, T-shaped stand; 31, T-shaped groove; 32, shell; 33, round protrusion. DETAILED DESCRIPTION

[0025] The following description is provided to enable those skilled in the art to practice the application. The preferred embodiments described below are only examples of the application and the skilled person can think of other obvious modifications.

[0026] As Figures 1-8The fixed structure of a high-frequency high-speed copper-clad plate shown in the application comprises a copper-clad plate base material 1 and a plurality of electronic elements 2 arranged on the copper-clad plate base material 1, a lower plate frame 7 is attached to the lower end face edge of the copper-clad plate base material 1, a lock plate pin 6 extends from the upper end corner of the lower plate frame 7, the lower plate frame 7 serves to support the copper-clad plate base material 1, the lock plate pin 6 is inserted into the mounting hole at the four corners of the copper-clad plate base material 1, which can position the copper-clad plate base material 1, two clamping column half rings 5 are symmetrically arranged at the lower end of the lower plate frame 7, the arrangement spacing between the plurality of clamping column half rings 5 is adapted to the arrangement spacing of the circular protrusion 33 at the bottom of the shell 32, the diameter of the clamping column half ring 5 is adapted to the diameter of the circular protrusion 33 at the bottom of the shell 32, which can ensure that when the copper-clad plate base material 1 is placed in the shell 32, the two clamping column half rings 5 on both sides are just clamped with the circular protrusion 33 at the bottom of the shell 32, avoiding the phenomenon of shaking, the upper plate frame 13 is elastically arranged above the lower plate frame 7, a plurality of top plate bridges 3 are arranged on the lower end of the lower plate frame 7 and the upper end of the upper plate frame 13, the upper plate frame 13 can press the copper-clad plate base material 1 on the lower plate frame 7 to fix it, a plurality of pressing plate columns 20 are arranged on the top plate bridge 3 and the bottom plate bridge 3, the top plate bridge 3 serves to support the pressing plate column 20, the lower end face of the upper pressing plate column 20 and the upper end face of the lower pressing plate column 20 are coaxially fixedly installed with a column cap 21, the plurality of column caps 21 on the upper plate frame 13 will press the plurality of areas in the middle of the copper-clad plate base material 1 on the plurality of column caps 21 on the lower plate frame 7, so as to enhance the restriction of the copper-clad plate base material 1, firmly fix the copper-clad plate base material 1, avoid the deformation of the copper-clad plate base material 1, and ensure normal use, and an adaptive piece is arranged between the pressing plate column 20 and the top plate bridge 3 and between the top plate bridge 3 and the lower plate frame 7 and the upper plate frame 13.

[0027] A T-shaped stand 30 extends from the middle of the lower end of the lower plate frame 7 on both sides, the end of the T-shaped stand 30 is fixed with the clamping column half ring 5, and the T-shaped stand 30 serves to fix the clamping column half ring 5.

[0028] A guide column shell 4 is fixedly installed at the upper end of the T-shaped stand 30, a pressing frame column 8 is coaxially and elastically installed in the guide column shell 4, and the cooperation between the guide column shell 4 and the pressing frame column 8 serves to guide the upper plate frame 13, the pressing frame column 8 penetrates out from the upper end of the guide column shell 4, two pressing frame shelves 9 are symmetrically fixedly installed on the upper end of the pressing frame column 8, a bending frame 10 is fixedly installed on the end of each of the two pressing frame shelves 9, the bending frame 10 serves to fix the upper plate frame 13 and the pressing frame shelf 9 together, the end of the bending frame 10 is fixed with the upper plate frame 13, when the shell cover of the shell 32 is fixed on the shell 32, the shell cover of the shell 32 will extrude the pressing frame shelf 9, thereby driving the upper plate frame 13 to move downward, so as to press the copper-clad plate base material 1 around the lower plate frame 7.

[0029] The lower end of the pressing frame column 8 is coaxially embedded with a positioning cap 28 which is slidingly installed in the interior of the guide column shell 4. The positioning cap 28 plays a role of preventing the separation of the pressing frame column 8 and the guide column shell 4. The interior bottom surface of the guide column shell 4 is fixedly installed with a separation spring 29. The upper end of the separation spring 29 is fixed with the lower end of the positioning cap 28. The separation spring 29 can lift the upper plate frame 13, so as to facilitate the subsequent placement of the copper-clad plate substrate 1 on the lower plate frame 7.

[0030] The corner of the upper plate frame 13 is provided with a pin hole 11 which is located above the lock plate pin 6. The hole diameter of the pin hole 11 is matched with the diameter of the lock plate pin 6. The pin hole 11 can pass through the lock plate pin 6, so as to ensure that the upper plate frame 13 and the lower plate frame 7 can sufficiently press the copper-clad plate substrate 1. The upper plate frame 13, the lower plate frame 7, the lock plate pin 6 and the column cap 21 are all made of insulating materials.

[0031] The adaptive part includes T-shaped sliding strips 12 which are extended at the front and rear edges of the lower end surface of the lower plate frame 7 and the front and rear edges of the upper end surface of the upper plate frame 13. The two ends of the top plate bridge 3 are slidingly installed on the outer surface of the T-shaped sliding strip 12. The T-shaped sliding strip 12 plays a role of guiding the top plate bridge 3. The horizontal section of the top plate bridge 3 is provided with an adaptive sliding groove 15. The adaptive sliding groove 15 is slidingly installed with a I-shaped adaptive block 18 in the interior. The adaptive sliding groove 15 plays a role of sliding the I-shaped adaptive block 18. One end of the I-shaped adaptive block 18 is fixed with the pressing plate column 20. The I-shaped adaptive block 18 plays a role of bearing the pressing plate column 20.

[0032] The two ends of the top plate bridge 3 are hollowed and provided with bearing cavities 26. The bearing cavities 26 are elastically installed with rubber pressing plates 27 in the interior. The bearing cavities 26 play a role of accommodating the rubber pressing plates 27. The two ends of the top plate bridge 3 are provided with T-shaped grooves 31 which are communicated with the bearing cavities 26. The T-shaped sliding strip 12 is slidingly penetrated in the interior of the T-shaped groove 31. The T-shaped groove 31 can adapt to the shape of the T-shaped sliding strip 12, so that the top plate bridge 3 can slide on the T-shaped sliding strip 12. The rubber pressing plate 27 is pressed on the T-shaped sliding strip 12, which can ensure that the top plate bridge 3 will not be self-displaced. The I-shaped adaptive block 18 is extended with a square rib 22 in the middle of the end surface which is opposite to the end surface where the pressing plate column 20 is located. The square rib 22 is elastically installed with a rubber pressing cover 19 on the outer surface. The square rib 22 plays a role of guiding the rubber pressing cover 19. The rubber pressing cover 19 is pressed on the top plate bridge 3, which can ensure that the I-shaped adaptive block 18 will not be self-displaced.

[0033] The rubber gland 19 extends two fingers 23 on both sides, the fingers 23 are integrally formed with the rubber gland 19, the fingers 23 play a role of facilitating the rubber gland 19 to be pushed, the end of the square rib 22 is fixedly installed with the spring cap 16, the outer side of the square rib 22 is wound with the first pressing spring 17, the spring cap 16 plays a role of bearing the first pressing spring 17, one end of the first pressing spring 17 is fixed with the rubber gland 19, the other end of the first pressing spring 17 is fixed with the spring cap 16, the first pressing spring 17 plays a role of pressing the rubber gland 19 on the top plate bridge 3, the rubber pressing plate 27 extends the lifting column 14 in the middle, the lifting column 14 plays a role of facilitating the rubber pressing plate 27 to be lifted, the end of the lifting column 14 penetrates out from the corner of the top plate bridge 3, the outer side of the lifting column 14 is wound with the second pressing spring 25, one end of the second pressing spring 25 is fixed with the rubber pressing plate 27, the second pressing spring 25 plays a role of pressing the rubber pressing plate 27 on the T-shaped slide bar 12, the other end of the second pressing spring 25 is fixed with the inner wall of the bearing cavity 26, the end of the lifting column 14 symmetrically extends two column claws 24, the column claws 24 play a role of facilitating the lifting column 14 to be held.

[0034] In use, according to the distribution position of the electronic components 2 on the copper-clad plate substrate 1, the column claw 24 is pulled, thereby driving the rubber pressing plate 27 pressed by the second pressing spring 25 to be separated from the T-shaped slide bar 12, then the top plate bridge 3 is actuated to slide on the T-shaped slide bar 12, so as to adjust the left and right positions of the column cap 21, and the finger block 23 is actuated, so that the rubber pressing cap 19 pressed by the first pressing spring 17 is separated from the top plate bridge 3, then the I-shaped adaptive block 18 is actuated to slide in the adaptive sliding groove 15 on the top plate bridge 3, so as to adjust the front and back positions of the column cap 21, so as to change the distribution position of the plurality of column caps 21, so as to adapt to the electronic components 2 with different distribution positions on the copper-clad plate substrate 1, that is, the column cap 21 and the electronic components 2 on the copper-clad plate substrate 1 are staggered, then the copper-clad plate substrate 1 is placed in the shell 32, at this time the two clamping column half rings 5 on both sides are just clamped with the circular protrusions 33 at the bottom of the shell 32, so as to position the copper-clad plate substrate 1, then the shell cover of the shell 32 is fixed on the shell 32, during the fixing process, the shell cover of the shell 32 will extrude the pressing frame 9, thereby driving the upper plate frame 13 to move downward, so as to press the copper-clad plate substrate 1 around the lower plate frame 7, at the same time, the plurality of column caps 21 on the upper plate frame 13 will press the plurality of areas in the middle of the copper-clad plate substrate 1 on the plurality of column caps 21 on the lower plate frame 7, the installation is completed, so that the upper plate frame 13, the lower plate frame 7 and the plurality of column caps 21 are pressed together, so as to enhance the limitation of the copper-clad plate substrate 1, so as to firmly fix the copper-clad plate substrate 1, so as to avoid the deformation of the copper-clad plate substrate 1, so as to ensure normal use, at the same time, during the installation process, when the shell cover of the shell 32 and the shell 32 are closed, the copper-clad plate substrate 1 can be installed in the shell 32 at the same time, the process does not need to separately fix the copper-clad plate substrate 1 in the shell 32, and then close the shell cover of the shell 32 and the shell 32, the operation is simple and convenient, which effectively facilitates the installation.

[0035] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A fixing structure for a high-frequency, high-speed copper-clad laminate, comprising a copper-clad laminate substrate (1) and a plurality of electronic components (2) disposed on the copper-clad laminate substrate (1), characterized in that: A lower plate frame (7) is attached to the lower edge of the copper-clad laminate substrate (1). A locking pin (6) extends from the upper corner of the lower plate frame (7). The locking pin (6) is inserted into the mounting holes at the four corners of the copper-clad laminate substrate (1). Two locking pin semi-rings (5) are symmetrically arranged on both sides of the lower end of the lower plate frame (7). The arrangement spacing between the multiple locking pin semi-rings (5) matches the arrangement spacing of the circular protrusions at the bottom of the outer shell. The diameter of the locking pin semi-rings (5) matches the diameter of the circular protrusions at the bottom of the outer shell. An upper plate frame (13) is elastically provided above the plate frame (7). Multiple top plate bridges (3) are provided at the lower end of the lower plate frame (7) and the upper end of the upper plate frame (13). Multiple pressure plate columns (20) are provided on the upper and lower top plate bridges (3). Column caps (21) are coaxially fixedly installed on the lower end face of the upper pressure plate column (20) and the upper end face of the lower pressure plate column (20). Adaptive parts are provided between the pressure plate column (20) and the top plate bridge (3) and between the top plate bridge (3) and the lower plate frame (7) and the upper plate frame (13). The adapting component includes a T-shaped slide bar (12) extending from the front and rear edges of the lower end face of the lower plate frame (7) and from the front and rear edges of the upper end face of the upper plate frame (13). The two ends of the top plate bridge (3) are slidably mounted on the outer surface of the T-shaped slide bar (12). The horizontal section of the top plate bridge (3) is provided with an adapting groove (15). An I-shaped adapting block (18) is slidably mounted inside the adapting groove (15). One end of the I-shaped adapting block (18) is fixed to the pressure plate column (20). Both ends of the top plate bridge (3) are hollowed out to form a bearing cavity (26). A rubber pressure plate (27) is elastically installed inside the bearing cavity (26). Both ends of the top plate bridge (3) are provided with a T-shaped groove (31). The T-shaped groove (31) is connected to the bearing cavity (26). The T-shaped slide (12) slides through the inside of the T-shaped groove (31). The rubber pressure plate (27) is pressed against the T-shaped slide (12). A square ridge (22) extends from the middle of the end face opposite to the end face of the pressure plate column (20) on the I-shaped adapting block (18). A rubber cover (19) is elastically installed on the outer surface of the square ridge (22). The rubber cover (19) is pressed against the top plate bridge (3).

2. The fixing structure for a high-frequency, high-speed copper-clad laminate according to claim 1, characterized in that: T-shaped supports (30) extend from the middle of the lower two sides of the lower plate frame (7), and the ends of the T-shaped supports (30) are fixed to the pin half ring (5).

3. The fixing structure for a high-frequency, high-speed copper-clad laminate according to claim 2, characterized in that: The upper end of the T-shaped stand (30) is fixedly installed with a guide column shell (4). Inside the guide column shell (4), a pressure frame column (8) is coaxially and elastically installed. The pressure frame column (8) extends through the upper end of the guide column shell (4). Two pressure frame display frames (9) are symmetrically fixedly installed at the upper end of the pressure frame column (8). The ends of the two pressure frame display frames (9) are fixedly installed with bending frames (10). The ends of the bending frames (10) are fixed to the upper plate frame (13).

4. The fixing structure for a high-frequency, high-speed copper-clad laminate according to claim 3, characterized in that: The lower end of the pressure frame column (8) is coaxially inlaid with a positioning cap (28), which is slidably installed inside the guide column shell (4). A separation spring (29) is fixedly installed on the bottom surface of the guide column shell (4), and the upper end of the separation spring (29) is fixed to the lower end of the positioning cap (28).

5. The fixing structure for a high-frequency, high-speed copper-clad laminate according to claim 1, characterized in that: A pin hole (11) is provided through the corner of the upper plate frame (13). The pin hole (11) is located above the locking pin (6), and the diameter of the pin hole (11) is adapted to the diameter of the locking pin (6).

6. The fixing structure for a high-frequency, high-speed copper-clad laminate according to claim 1, characterized in that: Both sides of the rubber cap (19) have extended finger blocks (23), which are integrally formed with the rubber cap (19). A spring cap (16) is fixedly installed at the end of the square ridge (22). A compression spring (17) is wound around the outside of the square ridge (22). One end of the compression spring (17) is fixed to the rubber cap (19), and the other end of the compression spring (17) is fixed to the spring cap (16). A lifting column (14) extends from the middle of the plate (27). The end of the lifting column (14) extends through the corner of the top plate bridge (3). A second compression spring (25) is wrapped around the outside of the lifting column (14). One end of the second compression spring (25) is fixed to the rubber pressure plate (27), and the other end of the second compression spring (25) is fixed to the inner wall of the bearing cavity (26). Two claws (24) extend symmetrically from the end of the lifting column (14).

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