A wedge-shaped wire clamp for cable lines

Abstract

This invention discloses a wedge-shaped cable clamp, comprising a wedge clamp body and a power-connected screw. The power-connected screw is screwed and fixed to the wedge clamp body. One end of the wedge clamp body is provided with a middle sliding mounting seat, a mounting surface unlocking trigger component, an adaptive propulsion component, and a wedge insertion dynamic sensing end. After the inserted wedge drives the conductor to be inserted into the wedge clamp seat, the inserted wedge slides into contact with the sliding reset plate. This causes the lifting unlocking end seat to be lifted by the pushing action of the sliding reset plate when the inserted wedge is inserted, releasing the engagement between the unlocking protrusion and the locking protrusion. At this time, the intermediate gap reduction push rod moves towards the inserted wedge in an unrestricted state through the force of the unrestricted elastic connection part, thereby shrinking the movable space of the inserted wedge inside the wedge clamp seat. This ensures that the inserted wedge, carrying the conductor, remains stable after entering the wedge clamp seat, avoiding displacement errors.

Description

Technical Field

[0001] The invention relates to the technical field of cable installation, and in particular to a wedge-shaped wire clamp for a cable line. Background Art

[0002] The wedge-shaped wire clamp is mainly composed of a clamp seat and a wedge piece, wherein the wedge piece is installed on the inner side of the clamp seat, and the wire is locked by the relative sliding of the clamp seat and the wedge piece. This locking method can eliminate the bending stress in the same direction as the dynamic stress of breeze vibration and the compressive stress caused by weight. However, the existing wedge-shaped wire clamp has the following problems when inserting the wire and the wedge piece for assembly. In order to ensure that the wedge piece can be inserted in one go, a large insertion space is usually reserved in the inner groove of the clamp seat. However, due to this influence, the wedge piece is prone to movable displacement on the inside of the groove body when the installer connects the wire at the end, which makes it inconvenient to keep the wire and the wedge piece in the inner groove of the clamp seat stable before confirming the length of the wire installation. After the displacement error of the wire and the wedge piece occurs, it is inconvenient for the installer to judge whether the reserved length of the current wire connection meets the crossing requirements, and manual debugging and processing are required, resulting in less than ideal convenience during assembly. To this end, we propose a wedge-shaped wire clamp for cable lines. Summary of the invention

[0003] The main purpose of the present invention is to provide a wedge-shaped wire clamp for a cable line.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A wedge-shaped wire clamp for a cable line comprises a wedge clamp body and an electric power hole screw, wherein the electric power hole screw is screwed and fixed to the wedge clamp body, and one end of the wedge clamp body is provided with an intermediate sliding assembly seat, an assembly surface unlocking trigger component, an adaptive propulsion component and a wedge insertion dynamic sensing end, wherein the wedge clamp body is composed of a wedge clamp seat and an inserted wedge, the assembly surface unlocking trigger component is installed on the top wall of the intermediate sliding assembly seat, and the assembly surface unlocking trigger component is snap-connected with the adaptive propulsion component, and the adaptive propulsion component is slidably connected with the intermediate sliding assembly seat, after the inserted wedge is inserted into the inner side of the wedge clamp seat, the filling gap inside the wedge clamp seat is reduced by the adaptive propulsion component, and the response signal of the wedge insertion dynamic sensing end is triggered by the assembly surface unlocking trigger component, the wedge insertion dynamic sensing end is fixedly connected to one end of the intermediate sliding assembly seat, and the wedge insertion dynamic sensing end is used to monitor whether dynamic pressure is generated after the inserted wedge is currently in the inner side of the wedge clamp seat.

[0006] A further improvement of the present invention is that the assembly surface unlocking trigger component includes a lifting and unlocking end seat, an insert push signal response component and a lifting angle transmission guide seat, the lifting angle transmission guide seat is fixedly connected to the top of the intermediate sliding assembly seat, the lifting and unlocking end seat is rotatably connected to the lifting angle transmission guide seat, the insertion push signal response component is arranged at one end of the lifting angle transmission guide seat, the insertion push signal response component includes a non-transmission point fixing seat, an embedded snap-fit ​​seat and a non-self-locking response switch, the non-transmission point fixing seat is fixedly connected to the outer wall of the lifting angle transmission guide seat, the embedded snap-fit ​​seat is fixedly connected to one end of the non-transmission point fixing seat, the non-self-locking response switch is embedded on the inner side of the embedded snap-fit ​​seat, and the top of the lifting and unlocking end seat is fixedly connected with an end trigger push head, and the end trigger push head is snap-fitted and connected with the embedded snap-fit ​​seat.

[0007] A further improvement of the present invention is that the adaptive propulsion assembly includes a non-restricted elastic connection portion, an intermediate limiting slide and an intermediate gap shrinking push rod, the non-restricted elastic connection portion passes through the intermediate sliding assembly seat and is slidably connected to the intermediate sliding assembly seat, the intermediate limiting slide is fixedly connected to one end of the intermediate sliding assembly seat, the wedge piece is inserted into the dynamic sensing end and is fixedly connected to the other end of the intermediate sliding assembly seat, the intermediate gap shrinking push rod is fixedly connected between the intermediate limiting slide and the intermediate sliding assembly seat, a stop assembly is arranged between the lifting and unlocking end seat and the intermediate gap shrinking push rod, and the stop assembly is used for sliding locking of the adaptive propulsion assembly.

[0008] A further improvement of the present invention is that the wedge insertion dynamic sensing end includes a sliding reset disk and a pressure sensing unit, the sliding reset disk and the pressure sensing unit are detachably connected, the sliding reset disk is electrically connected to the embedded snap-fit ​​seat, and the pressure sensing unit is used to slide and lift the rotational inclination angle of the lifting and unlocking end seat, thereby controlling the end trigger push head to conduct the electrical path between the pressure sensing unit and the sliding reset disk.

[0009] A further improvement of the present invention is that the stopping assembly includes an unlocking protrusion and a locking protrusion, the unlocking protrusion is fixedly connected to the bottom of the lifting and unlocking end seat, and the locking protrusion is fixedly connected to the top of the middle gap shrinking push rod, and the locking protrusion and the unlocking protrusion are both used to slide and lock the middle gap shrinking push rod when the inserted wedge is not installed.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. After the insertion wedge drives the wire to be inserted into the inner side of the wedge-shaped clamp seat, the insertion wedge slides into contact with the sliding reset disk, so that the lifting unlocking end seat is lifted up by the pushing action of the sliding reset disk when the insertion wedge is inserted, and the cooperation blockage of the unlocking protrusion and the locking protrusion is released. At this time, the middle gap is shrunk and the push rod moves toward the insertion wedge in an unrestricted state through the force of the unrestricted elastic connection part, thereby shrinking the insertion wedge in the movable space inside the wedge-shaped clamp seat, so that the insertion wedge with the wire into the inner side of the wedge clamp seat remains in a stable state, avoiding displacement errors, and facilitating the installer to confirm that the wire should have a reserved length when connecting the wire at the tail end. At the same time, the installation and limiting can be completed in one operation, which can effectively improve the installation efficiency.

[0012] 2. The present invention inserts the wedge piece and sends the wire into the inner side of the wedge-shaped clamp seat, so that the sliding reset disk is lifted, and at the same time, the end trigger push head is lifted and placed into the inner side of the embedded snap-fit ​​seat as the unlocking end seat is lifted, thereby synchronously triggering the start switch of the non-self-locking response switch, so that the pressure sensing unit is in a conducting state and in close contact with the fixed wire on the outer side of the inserted wedge piece. At this time, the installer can quickly obtain the displacement state of the inserted wedge piece at the position of the wedge clamp body at the other end of the wire installation, so as to avoid intercepting the wire across the length after installation without confirming the displacement state of the inserted wedge piece, thereby further improving the convenience of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of a wedge-shaped wire clamp for a cable line of the present invention is shown in FIG. Figure 1 .

[0014] Figure 2 The structure of a wedge-shaped wire clamp for a cable line of the present invention is shown in FIG. Figure 2 .

[0015] Figure 3 The present invention is a cross-sectional view of a wedge-shaped wire clamp for a cable line.

[0016] Figure 4 for Figure 3 Enlarged view of part A in the middle.

[0017] In the figure: 1. Wedge clamp body; 11. Wedge clamp seat; 12. Insert wedge; 2. Power screw with hole; 3. Middle sliding assembly seat; 4. Assembly surface unlocking trigger component; 41. Lifting unlocking end seat; 411. End trigger push head; 42. Insert push signal response component; 421. Non-transmission point fixing seat; 422. Embedded snap-fit ​​seat; 423. Non-self-locking response switch; 43. Lifting angle transmission guide seat; 5. Adaptive push assembly; 51. Non-restricted elastic connection; 52. Middle limiting slide; 53. Middle gap shrinking push rod; 6. Wedge insertion dynamic sensing end; 61. Sliding reset disk; 62. Pressure sensing unit; 7. Stop assembly; 71. Unlocking protrusion; 72. Locking protrusion. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limitations on this patent. In order to better illustrate the specific embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 4 , a wedge-shaped wire clamp for a cable line comprises a wedge clamp body 1 and an electric power hole screw 2, the electric power hole screw 2 is screwed and fixed to the wedge clamp body 1, one end of the wedge clamp body 1 is provided with an intermediate sliding assembly seat 3, an assembly surface unlocking trigger component 4, an adaptive propulsion component 5 and a wedge insertion dynamic sensing end 6, the wedge clamp body 1 is composed of a wedge clamp seat 11 and an inserted wedge 12, the assembly surface unlocking trigger component 4 is installed on the top wall of the intermediate sliding assembly seat 3, and the assembly surface unlocking trigger component 4 is engaged and connected with the adaptive propulsion component 5, the adaptive propulsion component 5 is slidably connected with the intermediate sliding assembly seat 3, after the inserted wedge 12 is inserted into the inner side of the wedge clamp seat 11, the filling gap inside the wedge clamp seat 11 is reduced by the adaptive propulsion component 5, and the response signal of the wedge insertion dynamic sensing end 6 is triggered by the assembly surface unlocking trigger component 4, the wedge insertion dynamic sensing end 6 is fixedly connected to one end of the intermediate sliding assembly seat 3, and the wedge insertion dynamic sensing end 6 is used to monitor whether dynamic pressure is generated after the current inserted wedge 12 is in the inner side of the wedge clamp seat 11.

[0020] In this embodiment, in order to solve the technical defect that the wedge piece is easy to move inside the slot body when the installer connects the wire at the end, it is not convenient to keep the wire and the wedge piece in the inner slot of the clamp seat stable before confirming the length of the wire installation, and after the displacement error of the wire and the wedge piece occurs, it is not convenient for the installer to judge whether the reserved length of the current wire connection meets the span requirement, and manual debugging is required, the present invention proposes a wedge-shaped wire clamp for cable lines, and solves the technical defect by setting an intermediate sliding assembly seat 3, an assembly surface unlocking trigger component 4, an adaptive propulsion component 5, a wedge piece insertion dynamic sensing end 6 and a stop component 7. Among them, the wedge clamp body 1 and the power band hole screw 2 are not the improved content of the present invention, and their specific assembly principles are not repeated here.

[0021] In an optional implementation manner of the present embodiment, the assembly surface unlocking trigger component 4 includes a lifting and unlocking end seat 41, an insert push signal response component 42 and a lifting angle transmission guide seat 43, the lifting angle transmission guide seat 43 is fixedly connected to the top of the middle sliding assembly seat 3, the lifting and unlocking end seat 41 is rotatably connected to the lifting angle transmission guide seat 43, the insert push signal response component 42 is arranged at one end of the lifting angle transmission guide seat 43, the insert push signal response component 42 includes a non-transmission point fixing seat 421, an embedded snap-fit ​​seat 422 and a non-self-locking response switch 423, the non-transmission point fixing seat 421 is fixedly connected to the outer wall of the lifting angle transmission guide seat 43, the embedded snap-fit ​​seat 422 is fixedly connected to one end of the non-transmission point fixing seat 421, the non-self-locking response switch 423 is embedded on the inner side of the embedded snap-fit ​​seat 422, and the top of the lifting and unlocking end seat 41 is fixedly connected with an end trigger push head 411, and the end trigger push head 411 is snap-fitted and connected with the embedded snap-fit ​​seat 422.

[0022] In this embodiment, the pressure sensing unit 62 is connected to an external receiving terminal, and is used to receive the transmission of pressure data. After the insertion wedge 12 drives the wire to be inserted into the inner side of the wedge-shaped clamp seat 11, the insertion wedge 12 slides in contact with the sliding reset disk 61, so that the lifting and unlocking end seat 41 is lifted up by the push of the sliding reset disk 61 when the insertion action of the insertion wedge 12 occurs. At this time, the end trigger push head 411 is driven by the rotation of the lifting and unlocking end seat 41 to be inserted into the inner side of the embedded snap seat 422, so that the start switch of the non-self-locking response switch 423 inside the embedded snap seat 422 is squeezed and opened after the end trigger push head 411 is snapped and connected with the embedded snap seat 422, thereby switching the pressure sensing unit 62 to a conductive state. At this time, since the unlocking protrusion 71 and the locking protrusion 72 are in the unlocked state after the unlocking end seat 41 is lifted and rotated, the intermediate gap is shortened and the push rod 53 drives the pressure sensing unit 62 and the wire fixed on the outside of the inserted wedge 12 to be in a fitted contact state under the action of the non-restricted elastic connection part 51. The pressure contact signal of the wire fixed on the outside of the inserted wedge 12 is obtained through the pressure sensing unit 62, so that the installer can quickly obtain the displacement state of the inserted wedge 12 at the position of the wedge clamp body 1 at the other end of the wire installation, thereby avoiding the wire crossing the length after installation without confirming the displacement of the inserted wedge 12, thereby further improving the installation convenience.

[0023] In an optional implementation of the present embodiment, the adaptive propulsion assembly 5 includes a non-restricted elastic connection portion 51, an intermediate limiting slide 52 and an intermediate gap shrinking push rod 53. The non-restricted elastic connection portion 51 passes through the intermediate sliding assembly seat 3 and is slidably connected to the intermediate sliding assembly seat 3. The intermediate limiting slide 52 is fixedly connected to one end of the intermediate sliding assembly seat 3. The wedge is inserted into the dynamic sensing end 6 and is fixedly connected to the other end of the intermediate sliding assembly seat 3. An intermediate gap shrinking push rod 53 is fixedly connected between the intermediate limiting slide 52 and the intermediate sliding assembly seat 3. A stop assembly 7 is arranged between the lifting and unlocking end seat 41 and the intermediate gap shrinking push rod 53. The stop assembly 7 is used for sliding locking of the adaptive propulsion assembly 5.

[0024] When the wedge 12 is inserted into the inner side of the wedge clamp 11, the wedge 12 is pushed and the sliding reset disk 61 is contacted with the sliding reset disk 61. At this time, the unlocking end seat 41 is lifted up by the pushing action of the sliding reset disk 61 when the insertion action of the wedge 12 is generated, and the cooperation blockage of the unlocking protrusion 71 and the locking protrusion 72 is released. At this time, the middle gap is shrunk and the push rod 53 moves toward the direction of the wedge 12 under the force of the unrestricted elastic connection part 51 in the unrestricted state, and then the wedge 12 is retracted to the movable space inside the wedge clamp 11, so that the wedge 12 keeps a stable state after entering the inner side of the wedge clamp 11 with the wire, avoiding displacement error, and facilitating the installer to confirm that the wire should have a reserved length when connecting the wire at the tail end. At the same time, the installation and limiting can be completed in one operation, which can effectively improve the installation efficiency.

[0025] In an optional implementation of the present embodiment, the wedge insertion dynamic sensing end 6 includes a sliding reset disk 61 and a pressure sensing unit 62. The sliding reset disk 61 and the pressure sensing unit 62 are detachably connected. The sliding reset disk 61 is electrically connected to the embedded snap-fit ​​seat 422. The pressure sensing unit 62 is used to slide and lift the rotation angle of the unlocking end seat 41, thereby controlling the end trigger push head 411 to conduct the electrical path between the pressure sensing unit 62 and the sliding reset disk 61.

[0026] In this embodiment, after the wedge clamp seat 11, the inserted wedge 12 and the conductor are assembled, when the current crossing area is an area prone to breeze vibration, the pressure sensing unit 62, the sliding reset disk 61 and the intermediate gap shrinking push rod 53 can be used as the displacement monitoring end of the inserted wedge 12 to monitor the displacement of the inserted wedge 12 when it is vibrated by breeze in real time, that is, when the inserted wedge 12 is displaced when it is vibrated by breeze on the inner side of the wedge clamp seat 11, the pressure response signal of the sliding reset disk 61 is triggered. When the frequency of the pressure signal exceeds the preset response value, a signal is sent to the maintenance end, so that the operator arrives at the site for subsequent maintenance operations. The pressure sensing unit 62 can be independently disassembled from the sliding reset disk 61 by bolts. When the assembly point is selected as an environment where no monitoring is required, the pressure sensing unit 62 can be independently disassembled for subsequent installation after the assembly of the wedge clamp seat 11, the inserted wedge 12 and the conductor is completed.

[0027] In an optional implementation of the present embodiment, the stop assembly 7 includes an unlocking protrusion 71 and a locking protrusion 72. The unlocking protrusion 71 is fixedly connected to the bottom of the lifting and unlocking end seat 41, and the locking protrusion 72 is fixedly connected to the top of the middle gap shrinking push rod 53. The locking protrusion 72 and the unlocking protrusion 71 are both used to slide and lock the middle gap shrinking push rod 53 when the inserted wedge 12 is in a non-installed state.

[0028] In this embodiment, when the wedge clamp seat 11 and the inserted wedge piece 12 are not inserted into each other, the lifted unlocking end seat 41 is in a horizontal state. At this time, the unlocking protrusion 71 is located at the front end of the locking protrusion 72, which has a sliding restriction effect on the middle gap shrinking push rod 53. The non-restricted elastic connection part 51 arranged between the middle limiting slide seat 52 and the middle sliding assembly seat 3 remains contracted, so that the middle gap shrinking push rod 53 is in a fixed position, thereby reserving the groove space on the inner side of the wedge clamp seat 11.

[0029] The working principle of the present invention is: the insertion wedge 12 drives the wire to be inserted into the inner side of the wedge clamp seat 11, so that the insertion wedge 12 is in sliding contact with the sliding reset disk 61. At this time, the lifting unlocking end seat 41 is lifted up by the pushing action of the sliding reset disk 61 when the insertion action of the insertion wedge 12 occurs, and the cooperation interception of the unlocking protrusion 71 and the locking protrusion 72 is released, so that the middle gap is shrunk and the push rod 53 moves toward the insertion wedge 12 in an unrestricted state through the force of the unrestricted elastic connection part 51, and shrinks the movable space of the insertion wedge 12 inside the wedge clamp seat 11, so that the insertion wedge 12 keeps a stable state after carrying the wire into the inner side of the wedge clamp seat 11, avoiding displacement error. Furthermore, when the sliding reset disk 61 is lifted, the end trigger push head 411 is lifted and placed into the inner side of the embedded snap-fit ​​seat 422 as the unlocking end seat 41 is rotated and lifted, triggering the start switch of the non-self-locking response switch 423, so that the pressure sensing unit 62 is in a conductive state and is in contact with the fixed wire on the outside of the inserted wedge 12, so that the installer can quickly obtain the displacement state of the inserted wedge 12 at the position of the wedge clamp body 1 at the other end of the wire installation, avoiding the wire from being cut across the length after installation without confirming the displacement of the inserted wedge 12, thereby further improving the convenience of installation.

[0030] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wedge-shaped cable clamp, comprising a wedge clamp body (1) and a power hole screw (2), wherein the power hole screw (2) is screwed and fixed to the wedge clamp body (1), characterized in that: One end of the wedge clamp body (1) is provided with an intermediate sliding assembly seat (3), an assembly surface unlocking trigger component (4), an adaptive propulsion component (5) and a wedge piece insertion dynamic sensing end (6); the wedge clamp body (1) is composed of a wedge-shaped clamp seat (11) and an inserted wedge piece (12); the assembly surface unlocking trigger component (4) is mounted on the top wall of the intermediate sliding assembly seat (3); the assembly surface unlocking trigger component (4) is engaged with the adaptive propulsion component (5); and the adaptive propulsion component (5) is slidably connected to the intermediate sliding assembly seat (3). After the inserted wedge (12) is inserted into the inner side of the wedge-shaped clamp seat (11), the filling gap inside the wedge-shaped clamp seat (11) is reduced by the adaptive propulsion component (5), and the assembly surface unlocking trigger component (4) triggers the response signal of the wedge insertion dynamic sensing end (6), the wedge insertion dynamic sensing end (6) is fixedly connected to one end of the middle sliding assembly seat (3), and the wedge insertion dynamic sensing end (6) is used to monitor whether dynamic pressure is generated after the inserted wedge (12) is currently located inside the wedge-shaped clamp seat (11); The assembly surface unlocking trigger component (4) comprises a lifting unlocking end seat (41), an inserting push signal response component (42) and a lifting angle transmission guide seat (43); the lifting angle transmission guide seat (43) is fixedly connected to the top of the intermediate sliding assembly seat (3); the lifting unlocking end seat (41) is rotationally connected to the lifting angle transmission guide seat (43); the inserting push signal response component (42) is arranged at one end of the lifting angle transmission guide seat (43); and the inserting push signal response component (42) comprises a non-transmission point fixing seat (421). , an embedded snap-fit ​​seat (422) and a non-self-locking response switch (423), the non-transmission point fixing seat (421) is fixedly connected to the outer wall of the lifting angle transmission guide seat (43), the embedded snap-fit ​​seat (422) is fixedly connected to one end of the non-transmission point fixing seat (421), the non-self-locking response switch (423) is embedded in the inner side of the embedded snap-fit ​​seat (422), the top of the lifting unlocking end seat (41) is fixedly connected with an end trigger push head (411), and the end trigger push head (411) is snap-fitted and connected with the embedded snap-fit ​​seat (422); The wedge insertion dynamic sensing end (6) comprises a sliding reset disk (61) and a pressure sensing unit (62), wherein the sliding reset disk (61) and the pressure sensing unit (62) are detachably connected, and the sliding reset disk (61) is electrically connected to the embedded snap-fit ​​seat (422), and the pressure sensing unit (62) is used to slide and lift the rotation angle of the lifting and unlocking end seat (41), thereby controlling the end trigger push head (411) to conduct the electrical path between the pressure sensing unit (62) and the sliding reset disk (61).

2. A cable line wedge clamp according to claim 1, characterized in that: The adaptive propulsion assembly (5) comprises a non-restricted elastic connection portion (51), an intermediate limiting slide seat (52) and an intermediate gap shrinking push rod (53); the non-restricted elastic connection portion (51) passes through the intermediate sliding assembly seat (3) and is slidably connected to the intermediate sliding assembly seat (3); the intermediate limiting slide seat (52) is fixedly connected to one end of the intermediate sliding assembly seat (3); the wedge piece is inserted into the dynamic sensing end (6) and is fixedly connected to the other end of the intermediate sliding assembly seat (3); the intermediate gap shrinking push rod (53) is fixedly connected between the intermediate limiting slide seat (52) and the intermediate sliding assembly seat (3); a stop assembly (7) is provided between the lifting and unlocking end seat (41) and the intermediate gap shrinking push rod (53); the stop assembly (7) is used for sliding locking of the adaptive propulsion assembly (5).

3. A cable line wedge clamp according to claim 2, characterized in that: The stop assembly (7) comprises an unlocking protrusion (71) and a locking protrusion (72), wherein the unlocking protrusion (71) is fixedly connected to the bottom of the lifting unlocking end seat (41), and the locking protrusion (72) is fixedly connected to the top of the intermediate gap shrinking push rod (53), and the locking protrusion (72) and the unlocking protrusion (71) are both used to slide and lock the intermediate gap shrinking push rod (53) when the inserted wedge (12) is in a non-installed state.

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