Anti-loosening wedge-shaped wire clamp and installation method thereof

Abstract

The present invention discloses an anti-loosening wedge-shaped wire clamp and an installation method thereof. The wire clamp comprises an upper wedge, a lower wedge, an upper slider, a lower slider, a left cover and a right cover, a stepped channel with thin ends and thick middle is formed between the left cover and the right cover, the stepped channel comprises an upper channel, a middle channel and a lower channel, the lower end of the upper slider is stuck in the middle channel, the upper end of the upper slider extends out of the upper channel and turns outward to buckle the left cover and the right cover, the upper end of the lower slider is stuck in the middle channel, the lower end of the lower slider extends out of the lower channel and turns outward to buckle the left cover and the right cover, the lower end of the upper slider, the upper end of the lower slider and the middle channel form a clamping cavity, the upper wedge, the conductor and the lower wedge are arranged in the clamping cavity, the top surface of the upper wedge is provided with a descending sinking platform, the clamping bolt is located in the descending sinking platform, and the top of the clamping bolt is not higher than the top surface of the upper wedge. The present invention solves the problem that the clamping bolt is sunk to a certain height and the clamping bolt protrudes, which makes it difficult to install the upper slider.

Description

Technical Field

[0001] The invention relates to the field of power transmission and transformation equipment design, and in particular to an anti-loosening wedge-shaped wire clamp and an installation method thereof. Background Art

[0002] At present, in the tension section of overhead transmission lines, wedge-shaped tension clamps are gradually replacing the original compression-type tension clamps. The wedge-shaped tension clamps in the prior art fix the conductors by means of the cooperation of sliders, wedges, side plates and clamping bolts. Since the clamping bolts of the above-mentioned wedge-shaped tension clamps are located at a relatively high position, the wedge block needs to cooperate with the upper gland to complete the installation, and the high-altitude installation construction is still difficult. At the same time, some wedge-shaped tension clamps have relatively small sliding at the wedge connection position under the wind vibration load in service. Long-term repeated sliding may cause wear or partial discharge may occur only due to the change of contact position caused by sliding. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an anti-loosening wedge wire clamp and an installation method thereof, which reduces the difficulty of high-altitude installation of the wedge wire clamp, improves installation efficiency, and solves the problem that the protruding clamping bolt makes it difficult to install the upper slider.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The cam is secured to the left and right sides of the track when the conductor is in the track, and the cam is secured to the left and right sides of the track when the conductor is in the track.

[0006] As a further improvement of the above technical solution, a limiting bolt is provided between the upper slider and the upper wedge, the upper slider is provided with a mounting screw hole, the top surface of the upper wedge is provided with a straight groove, the limiting bolt cooperates with the mounting screw hole, and the bottom contacts with the bottom of the straight groove.

[0007] As a further improvement of the above technical solution, the upper wedge is provided with an upper arc-shaped positioning groove, and the lower wedge is provided with a lower arc-shaped positioning groove, and the wire is clamped in the upper arc-shaped positioning groove and the lower arc-shaped positioning groove.

[0008] As a further improvement of the above technical solution, anti-slip pads are provided in both the upper arc-shaped positioning groove and the lower arc-shaped positioning groove.

[0009] As a further improvement of the above technical solution, the top and bottom of the left cover are respectively provided with an upper left clamping block and a lower left clamping block, the top and bottom of the right cover are respectively provided with an upper right clamping block and a lower right clamping block, the upper end of the upper slider is provided with an upper left clamping slot and an upper right clamping slot, and the lower end of the lower slider is provided with a lower left clamping slot and a lower right clamping slot, the upper left clamping slot and the upper right clamping slot respectively cooperate with the upper left clamping block and the upper right clamping block, and the lower left clamping slot and the lower right clamping slot respectively cooperate with the lower left clamping block and the lower right clamping block.

[0010] As a further improvement of the above technical solution, a locking pin is provided at the tail of the clamping bolt to prevent the clamping bolt from loosening.

[0011] As a further improvement of the above technical solution, contact spring washers are provided between the clamping bolt and the upper wedge, and between the limiting bolt and the upper sliding block.

[0012] As a further improvement of the above technical solution, the upper wedge, lower wedge, upper slider, lower slider, left cover and right cover are all made of aluminum alloy, and the clamping bolt, locking pin and contact spring washer are all made of stainless steel.

[0013] As a further improvement of the above technical solution, the anti-loosening wedge-shaped wire clamp also includes a left hanging plate and a right hanging plate, and the left cover and the right cover are both provided with hanging ears, and the hanging ears include a shaft portion and a waist-shaped block portion located outside the shaft portion and vertically fixed to the shaft portion, and the left hanging plate and the right hanging plate are both provided with waist-shaped hanging grooves that can cooperate with the waist-shaped block portion.

[0014] A method for installing the above-mentioned anti-loosening wedge-shaped wire clamp includes the following steps: placing the left cover and the right cover to form a stepped channel, sliding the lower slider into the middle channel and the lower channel, the upper end of the lower slider is stuck in the middle channel, and the lower end of the lower slider extends out of the lower channel to be turned outward and buckled on the left cover and the right cover; clamping the upper wedge, the wire, and the lower wedge by means of a clamping bolt, the clamping bolt is embedded in the lower sinking platform of the upper wedge to prevent it from protruding from the top surface of the upper wedge, and then the upper wedge and the lower wedge are slid into the middle channel along the top surface of the lower slider; sliding the upper slider into the middle channel and the upper channel along the top surface of the upper wedge, the lower end of the upper slider is stuck in the middle channel, and the upper end of the upper slider extends out of the upper channel to be turned outward and buckled on the left cover and the right cover.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] (1) The anti-loosening wedge-shaped wire clamp and the installation method thereof of the present invention sink the clamping bolt to a certain height so that it does not protrude from the top surface of the upper wedge, so that the upper slider can slide horizontally from one end into the stepped channel formed by the left cover and the right cover. In this way, the upper slider can be inserted into the stepped channel without having one end lower than the other end, making high-altitude installation construction more convenient, reducing the difficulty of high-altitude installation of the wedge-shaped wire clamp, improving installation efficiency, and improving the overall clamping effect, solving the problem of difficulty in installing the upper slider due to the protrusion of the clamping bolt.

[0017] (2) The anti-loosening wedge-shaped wire clamp and its installation method of the present invention are characterized in that the upper slider, the upper wedge, the lower wedge and the lower slider are all in a pressed state by rotating the limit bolt so that the limit bolt is pressed against the straight groove of the upper wedge, thereby limiting the relative sliding of the upper and lower sliders and the upper and lower wedges, avoiding wear caused by repeated sliding and local discharge caused by poor contact after sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the anti-loosening wedge-shaped wire clamp of the present invention.

[0019] Figure 2 It is a top view of the anti-loosening wedge-shaped wire clamp of the present invention.

[0020] Figure 3 It is a cross-sectional view of the anti-loosening wedge-shaped wire clamp of the present invention.

[0021] Figure 4 It is a schematic diagram of the connection process of the upper wedge, the conductor and the lower wedge in the present invention.

[0022] Figure 5 It is a schematic diagram of the installation process of the left cover, the right cover and the lower sliding block in the present invention.

[0023] Figure 6 It is a schematic diagram of the installation process of the upper wedge and the lower wedge in the present invention.

[0024] Figure 7 It is a schematic diagram of the installation process of the upper sliding block in the present invention.

[0025] Figure 8 It is a schematic diagram of the installation process of the lower wedge bending section in the present invention.

[0026] Fig. 9 It is a schematic diagram of the installation process of the left hanging plate and the right hanging plate in the present invention.

[0027] The symbols in the figure represent:

[0028] 1. Upper wedge; 2. Lower wedge; 3. Upper slider; 4. Lower slider; 5. Left cover; 6. Right cover; 7. Clamping bolt; 8. Wire; 9. Step channel; 10. Upper channel; 11. Middle channel; 12. Lower channel; 13. Lower sinking platform; 14. Limiting bolt; 15. Mounting screw hole; 16. Straight groove; 17. Upper arc positioning groove; 18. Lower arc positioning groove; 19. Anti-skid pad; 20. Upper left clamping block; 21. Lower left clamping block; 22. Upper right clamping block; 23. Lower right clamping block; 24. Upper left slot; 25. Upper right slot; 26. Lower left slot; 27. Lower right slot; 30. Locking pin; 31. Contact spring pad; 32. Left hanging plate; 33. Right hanging plate; 34. Hanging ear; 35. Shaft; 36. Waist-shaped block; 37. Waist-shaped hanging groove; 38. Clamping screw cover. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 3 As shown, the anti-loosening wedge clamp of this embodiment includes an upper wedge 1, a lower wedge 2, an upper slider 3, a lower slider 4, a left cover 5 and a right cover 6. The upper wedge 1 and the lower wedge 2 are connected by a clamping bolt 7, and the wire 8 is clamped between the upper wedge 1 and the lower wedge 2. Two clamping bolts 7 are provided, and the interval between the two clamping bolts 7 is widened.

[0031] A stepped passage 9 with thin ends and thick middle is formed between the left cover 5 and the right cover 6. The stepped passage 9 includes an upper passage 10, a middle passage 11 and a lower passage 12. The lower end of the upper slider 3 is stuck in the middle passage 11, the upper end of the upper slider 3 extends out of the upper passage 10 and turns outward to buckle the left cover 5 and the right cover 6, the upper end of the lower slider 4 is stuck in the middle passage 11, the lower end of the lower slider 4 extends out of the lower passage 12 and turns outward to buckle the left cover 5 and the right cover 6, the lower end of the upper slider 3, the upper end of the lower slider 4 and the middle passage 11 form a clamping cavity, the upper wedge 1, the wire 8 and the lower wedge 2 are arranged in the clamping cavity, the top surface of the upper wedge 1 is provided with a descending sinking platform 13, the clamping bolt 7 is located in the descending sinking platform 13, and the top of the clamping bolt 7 is not higher than the top surface of the upper wedge 1. In this embodiment, the top of the clamping bolt 7 is preferably flush with the top surface of the upper wedge 1. The two ends are thin and the middle is thick, which means that the middle channel 11 is thick, and the upper channel 10 and the lower channel 12 at the two ends are thin, so that the upper slider 3 and the lower slider 4 can be buckled.

[0032] During installation, first put the left cover 5 and the right cover 6 in place to form a stepped channel 9, slide the lower slider 4 into the middle channel 11 and the lower channel 12, the upper end of the lower slider 4 is stuck in the middle channel 11, and the lower end of the lower slider 4 extends out of the lower channel 12 and buckles on the left cover 5 and the right cover 6; then, clamp the upper wedge 1, the wire 8, and the lower wedge 2 by the clamping bolt 7, and the clamping bolt 7 is embedded in the lower sinking platform 13 of the upper wedge 1 to prevent it from protruding from the top of the upper wedge 1 The upper wedge 1 and the lower wedge 2 are then slid into the middle channel 11 along the top surface of the lower slider 4; the upper slider 3 is slid into the middle channel 11 and the upper channel 10 along the top surface of the upper wedge 1, the lower end of the upper slider 3 is stuck in the middle channel 11, and the upper end of the upper slider 3 extends out of the upper channel 10 and buckles on the left cover 5 and the right cover 6, and finally the upper slider 3, the lower slider 4, the left cover 5 and the right cover 6 are buckled with each other and the upper wedge 1, the wire and the lower wedge 2 are clamped. Since the top surface of the upper wedge 1 and the bottom surface of the lower wedge 2 are wedge surfaces, they can be wedged in the clamping cavity to clamp the wire 8.

[0033] The anti-loosening wedge-shaped wire clamp sinks the clamping bolt 7 to a certain height so that it does not protrude from the top surface of the upper wedge 1, so that the upper slider 3 can slide horizontally from one end into the stepped channel 9 formed by the left cover 5 and the right cover 6. In this way, the upper slider 3 can be inserted into the stepped channel 9 without having one end lower than the other end, making high-altitude installation construction more convenient, reducing the difficulty of high-altitude installation of the wedge-shaped wire clamp, improving installation efficiency, and improving the overall clamping effect, solving the problem of difficulty in installing the upper slider 3 due to the protrusion of the clamping bolt 7.

[0034] In this embodiment, a limiting bolt 14 is provided between the upper slider 3 and the upper wedge 1, the upper slider 3 is provided with a mounting screw hole 15, and the top surface of the upper wedge 1 is provided with a straight groove 16. The limiting bolt 14 cooperates with the mounting screw hole 15, and the bottom thereof contacts the bottom of the straight groove 16. The limiting bolt 14 can be rotated to press against the straight groove 16 of the upper wedge 1, so that the upper slider 3, the upper wedge 1, the lower wedge 2, and the lower slider 4 are all in a pressed state, thereby limiting the relative sliding of the upper and lower sliders 4 and the upper and lower wedges, avoiding wear caused by repeated sliding and partial discharge caused by poor contact after sliding. Since the top surface of the upper wedge 1 is an inclined surface, in order to increase the contact area between the bottom of the limiting bolt 14 and the top surface of the upper wedge 1, the straight groove 16 is a horizontal groove.

[0035] In this embodiment, the upper wedge 1 is provided with an upper arc-shaped positioning groove 17, and the lower wedge 2 is provided with a lower arc-shaped positioning groove 18. The wire 8 is clamped in the upper arc-shaped positioning groove 17 and the lower arc-shaped positioning groove 18. The arc-shaped positioning groove 17 and the lower arc-shaped positioning groove 18 are both provided with anti-slip pads 19 to prevent the wire 8 from rotating or loosening.

[0036] In this embodiment, the top and bottom of the left cover 5 are respectively provided with an upper left block 20 and a lower left block 21, the top and bottom of the right cover 6 are respectively provided with an upper right block 22 and a lower right block 23, the upper end of the upper slider 3 is provided with an upper left slot 24 and an upper right slot 25, and the lower end of the lower slider 4 is provided with a lower left slot 26 and a lower right slot 27. The upper left slot 24 and the upper right slot 25 are respectively matched with the upper left block 20 and the upper right block 22 to form the above-mentioned specific structure of the outer turn fastening. Similarly, the lower left slot 26 and the lower right slot 27 are respectively matched with the lower left block 21 and the lower right block 23 to form the above-mentioned specific structure of the outer turn fastening. The lower end of the upper slider 3 is a T-shaped structure, the vertical part of the T-shaped structure is stuck in the upper channel 10, and the horizontal part of the T-shaped structure is stuck in the middle channel 11. The structure of the lower slider 4 is the same. Each slider is designed with a notch that matches with each side cover, and the side cover matching position is rounded to facilitate the insertion of the slider.

[0037] In this embodiment, a locking pin 30 is provided at the tail of the clamping bolt 7 to prevent the clamping bolt 7 from loosening. The provision of the locking pin 30 effectively prevents the clamping bolt from loosening during operation, causing the wire to run.

[0038] In this embodiment, contact spring washers 31 are provided between the clamping bolt 7 and the upper wedge 1 and between the limiting bolt 14 and the upper slider 3 to improve the overall clamping effect and prevent the clamping bolt 7 and the limiting bolt 14 from rotating and loosening.

[0039] In this embodiment, the upper wedge 1, the lower wedge 2, the upper slider 3, the lower slider 4, the left cover 5 and the right cover 6 are all made of aluminum alloy, have a high yield strength ratio and excellent material mechanical properties, and the clamping bolt 7, the locking pin 30 and the contact spring washer 31 are all made of stainless steel.

[0040] In this embodiment, the anti-loosening wedge wire clamp also includes a left hanging plate 32 and a right hanging plate 33, and the left cover 5 and the right cover 6 are both provided with a hanging ear 34, and the hanging ear 34 includes a shaft 35 and a waist-shaped block 36 located outside the shaft 35 and vertically fixed to the shaft 35, and the left hanging plate 32 and the right hanging plate 33 are both provided with a waist-shaped hanging groove 37 that can cooperate with the waist-shaped block 36. During installation, the left hanging plate 32 (or the right hanging plate 33) is first rotated by a certain angle so that the waist-shaped hanging groove 37 overlaps with the waist-shaped block 36, and then the left hanging plate 32 is hung on the shaft 35 through the waist-shaped block 36, and finally rotated by a certain angle so that the waist-shaped hanging groove 37 is misaligned with the waist-shaped block 36, and the left hanging plate 32 is basically in a horizontal position. The connection between the anti-loosening wedge wire clamp and the tower hanging point is realized through the left hanging plate 32 and the right hanging plate 33.

[0041] In this embodiment, the lower wedge 2 is provided with a curved section (extended section) to change the direction of the conductor 8 and ensure that the conductor 8 forms a smooth curve to cross the hanging point (hanging ear 34) and the iron tower and is connected to the other side. The outlet of the upper wedge 1 and the starting position of the curved section of the lower wedge 2 are made into a large rounded corner to ensure that the downward curved conductor 8 is not worn by the upper wedge 1 during operation. A clamping bolt hole is designed at the end of the lower wedge 2, and a clamping bolt 7b (in order to distinguish it from the previous clamping bolt 7, this clamping bolt is marked as 7b) and a clamping nut 38 are used to clamp the conductor 8. After the nut is tightened in place to clamp the curved section conductor 8, a locking pin 30 is also inserted into the bolt anti-loosening hole to prevent the clamping bolt 7b from loosening and ensure the fastening of the curved section of the conductor 8.

[0042] The installation method of the anti-loosening wedge clamp of this embodiment includes the following steps:

[0043] First, if Figure 4 As shown, the upper wedge 1 and the lower wedge 2 fix the conductor 8 between the upper arc-shaped positioning groove 17 and the lower arc-shaped positioning groove 18 through the clamping bolt 7. The position of the conductor is fixed by the clamping bolt 7. The clamping bolt 7 is provided with a contact spring washer and a locking pin hole at the end of the clamping bolt 7. The locking pin 30 is inserted to prevent the bolt from loosening after operation, thereby ensuring that the conductor 6 and the upper and lower wedges do not slip.

[0044] Secondly, if Figure 5 As shown, the lower slider 4 slides into the stepped channel between the left and right side covers to form a fit. The slider is designed with a notch that fits with the side cover, and the side cover fit position is rounded to facilitate the insertion of the slider.

[0045] Third, if Figure 6 As shown, the upper and lower wedges slide along the top surface of the lower slider 4 into the stepped channel between the left and right side covers.

[0046] Fourth, if Figure 7 As shown, the upper slider 3 slides into the stepped channel between the left and right side covers along the top surface of the upper wedge 1. The upper wedge has a descending platform 13, so that the clamping bolt 7 is lower than the top surface of the upper slider 3, reducing the protruding height of the clamping bolt 7, so that the upper slider 3 can directly slide the slider into place.

[0047] Fifth, if Figure 7 As shown, a straight groove 16 is opened in the middle of the upper wedge 1, and a mounting screw hole 15 is opened in the middle of the upper slider 4. The limiting bolt 14 is inserted into the straight groove 16 of the upper wedge 1 from the opening position of the upper slider 4 to ensure the relative position of the upper slider 3 and the upper wedge 1, so that the wedge-shaped wire clamp becomes a whole.

[0048] Sixth, if Figure 8 As shown, the clamping screw 7b of the bent section of the lower wedge 2 is installed.

[0049] Finally, if Fig. 9Install the siding as shown.

[0050] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An anti-loosening wedge-shaped wire clamp, characterized in that: The invention comprises an upper wedge (1), a lower wedge (2), an upper slider (3), a lower slider (4), a left cover (5) and a right cover (6), wherein the upper wedge (1) and the lower wedge (2) are connected by a clamping bolt (7), a wire (8) is clamped between the upper wedge (1) and the lower wedge (2), a stepped channel (9) with thin ends and thick middle is formed between the left cover (5) and the right cover (6), the stepped channel (9) comprising an upper channel (10), a middle channel (11) and a lower channel (12), the lower end of the upper slider (3) is stuck in the middle channel (11), the upper end of the upper slider (3) extends out of the upper channel (10) and turns outward to buckle the left cover (5) and the right cover ( 6), the upper end of the lower slider (4) is stuck in the middle channel (11), the lower end of the lower slider (4) extends out of the lower channel (12) and is turned outward to buckle on the left cover (5) and the right cover (6), the lower end of the upper slider (3), the upper end of the lower slider (4) and the middle channel (11) form a clamping cavity, the upper wedge (1), the wire (8) and the lower wedge (2) are arranged in the clamping cavity, the top surface of the upper wedge (1) is provided with a descending sinking platform (13), the clamping bolt (7) is located in the descending sinking platform (13), the top of the clamping bolt (7) is not higher than the top surface of the upper wedge (1), and a limit bolt (14) is provided between the upper slider (3) and the upper wedge (1) The upper slider (3) is provided with a mounting screw hole (15), the top surface of the upper wedge (1) is provided with a straight groove (16), the limit bolt (14) cooperates with the mounting screw hole (15), and the bottom is in contact with the bottom of the straight groove (16), the top and bottom of the left cover (5) are respectively provided with an upper left clamping block (20) and a lower left clamping block (21), the top and bottom of the right cover (6) are respectively provided with an upper right clamping block (22) and a lower right clamping block (23), the upper end of the upper slider (3) is provided with an upper left clamping groove (24) and an upper right clamping groove (25), the lower end of the lower slider (4) is provided with a lower left clamping groove (26) and a lower right clamping groove (27), the upper left clamping groove ( The left and right upper clamping grooves (24) and the right upper clamping groove (25) respectively cooperate with the left upper clamping block (20) and the right upper clamping block (22); the left lower clamping groove (26) and the right lower clamping groove (27) respectively cooperate with the left lower clamping block (21) and the right lower clamping block (23); the anti-loosening wedge-shaped wire clamp further comprises a left hanging plate (32) and a right hanging plate (33); the left side cover (5) and the right side cover (6) are both provided with hanging ears (34); the hanging ears (34) comprise a shaft portion (35) and a waist-shaped block portion (36) located outside the shaft portion (35) and vertically fixed to the shaft portion (35); the left hanging plate (32) and the right hanging plate (33) are both provided with waist-shaped hanging grooves (37) that can cooperate with the waist-shaped block portion (36).

2. The anti-loosening wedge-shaped wire clamp according to claim 1, characterized in that: The upper wedge (1) is provided with an upper arc-shaped positioning groove (17), and the lower wedge (2) is provided with a lower arc-shaped positioning groove (18), and the wire (8) is clamped in the upper arc-shaped positioning groove (17) and the lower arc-shaped positioning groove (18).

3. The anti-loosening wedge-shaped wire clamp according to claim 2, characterized in that: Anti-slip pads (19) are provided in both the upper arc-shaped positioning groove (17) and the lower arc-shaped positioning groove (18).

4. The anti-loosening wedge-shaped wire clamp according to any one of claims 1 to 3, characterized in that: A locking pin (30) is provided at the tail of the clamping bolt (7) for preventing the clamping bolt (7) from loosening.

5. The anti-loosening wedge-shaped wire clamp according to claim 4, characterized in that: Contact spring washers (31) are provided between the clamping bolt (7) and the upper wedge (1), and between the limiting bolt (14) and the upper slide block (3).

6. The anti-loosening wedge-shaped wire clamp according to claim 5, characterized in that: The upper wedge (1), the lower wedge (2), the upper slider (3), the lower slider (4), the left cover (5) and the right cover (6) are all made of aluminum alloy, and the clamping bolt (7), the locking pin (30) and the contact spring washer (31) are all made of stainless steel.

7. A method for installing the anti-loosening wedge-shaped wire clamp according to any one of claims 1 to 6, characterized in that: The following steps are involved: Place the left cover (5) and the right cover (6) to form a stepped channel (9), slide the lower slider (4) into the middle channel (11) and the lower channel (12), the upper end of the lower slider (4) is stuck in the middle channel (11), and the lower end of the lower slider (4) extends out of the lower channel (12) and is buckled on the left cover (5) and the right cover (6); clamp the upper wedge (1), the wire (8), and the lower wedge (2) by the clamping bolt (7), and the clamping bolt (7) is embedded in the upper wedge (1 ) in the lower sinking platform (13) to prevent it from protruding from the top surface of the upper wedge (1), and then slide the upper wedge (1) and the lower wedge (2) into the middle channel (11) along the top surface of the lower slider (4); slide the upper slider (3) into the middle channel (11) and the upper channel (10) along the top surface of the upper wedge (1), the lower end of the upper slider (3) is stuck in the middle channel (11), and the upper end of the upper slider (3) extends out of the upper channel (10) and is turned outward and buckled on the left cover (5) and the right cover (6).

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