An overhead cable installation rack for electric power construction

Abstract

The present invention discloses an overhead cable installation rack for electric power construction, which relates to the technical field of cable installation racks and includes a fixed ring, a mounting rack detachably installed on the fixed ring, and two guiding wheel assemblies detachably installed on the mounting rack in the horizontal direction; the guiding wheel assembly includes a support seat, a first wire wheel rotatably assembled on the support seat, and a second wire wheel slidably installed on the support seat through a sliding drive assembly, and the second wire wheel is above the first wire wheel. During the pulling process of the present invention, when the pulling force disappears and the cable slides to the right under its own weight, the second wire wheel slides in an arc above the first wire wheel and the distance between the second wire wheel and the first wire wheel continuously decreases, so that the clamping force of the first wire wheel and the second wire wheel on the cable increases, and the cable is clamped and locked by the first wire wheel and the second wire wheel, thereby avoiding the sliding of the cable and affecting the laying work of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cable mounting brackets, and particularly to an overhead cable mounting bracket for electric power construction. Background Art

[0002] A cable overhead laying and mounting bracket is a mounting bracket that plays a role in cable installation and positioning during high-altitude laying and installation. It can prevent the cable from shaking and wind up and release the cable. It is an indispensable facility for long-distance cable laying in electric power construction and is applied to various cable laying and installation occasions.

[0003] During the process of erecting overhead cables, the overhead cables will slide relative to the overhead cable mounting brackets. At this time, there is friction between the overhead cables and the overhead cable mounting brackets, which is likely to abrade the insulation layer on the outer side of the overhead cables. And if the overhead cables are not pulled in place at one time, due to the gravity of the overhead cables themselves, the overhead cables will slide back, affecting the erection of the overhead cables. Summary of the Invention

[0004] The purpose of the present invention is to provide an overhead cable mounting bracket for electric power construction to solve the problems raised in the above background art.

[0005] To achieve the above invention purpose, the present invention adopts the following technical solutions:

[0006] An overhead cable mounting bracket for electric power construction provided by the present invention includes a fixed ring, a mounting bracket detachably installed on the fixed ring, and two guide wheel assemblies detachably installed on the mounting bracket in the horizontal direction.

[0007] The guide wheel assembly includes a support seat, a first wire wheel rotatably assembled on the support seat, and a second wire wheel slidably installed on the support seat through a sliding drive assembly. The second wire wheel is above the first wire wheel, and there is a gap between the second wire wheel and the first wire wheel.

[0008] The sliding drive assembly is used to drive the second wire wheel to slide in an arc above the first wire wheel. The second wire wheel has an initial position and a terminal position during the arc sliding process. When the second wire wheel is at the initial position, the second wire wheel is directly above the first wire wheel. When the first wire wheel is at the terminal position, the second wire wheel is obliquely above the first wire wheel. During the process of the second wire wheel sliding from the initial position to the terminal position, the gap between the second wire wheel and the first wire wheel continuously decreases, and the second wire wheel is rotationally matched with the sliding drive assembly.

[0009] Further, an installation strip extending along the axial direction of the fixed ring is detachably installed on the fixed ring, and the mounting bracket is detachably installed on the installation strip. The mounting bracket includes a base plate, a diagonal support plate, and a pair of diagonal support seats. The base plate is vertically fixed on the installation strip. The diagonal support plate is inclined and arranged below the base plate. The top end of the diagonal support plate is fixedly connected to the end of the base plate away from the installation strip, and the bottom end of the diagonal support plate is fixedly connected to the bottom end of the installation strip. A pair of diagonal support seats are symmetrically and fixedly assembled on both sides of the base plate. A horizontal installation plane is arranged at the top of the diagonal support seat, and the support seats of the two guiding wheel assemblies are fixedly assembled on the two installation planes.

[0010] Further, the support seat includes a bottom plate and side plates symmetrically and vertically arranged on both sides of the top of the bottom plate. Among them, both ends of the first wire wheel are rotatably installed between a pair of side plates through bearing seats;

[0011] The sliding drive assembly includes arc grooves symmetrically formed on a pair of side plates and sliders slidably assembled in the arc grooves. Among them, both ends of the second wire wheel are respectively in rotational cooperation with a pair of sliders. The center point of the arc groove 41 is on one side of the center point of the cross-section of the first wire wheel 32; both ends of the arc groove are respectively a starting end and a terminal end. When the slider is at the starting end of the arc groove, the second wire wheel is directly above the first wire wheel. When the slider is at the terminal end of the arc groove, the second wire wheel is obliquely above one side of the first wire wheel away from the central axis of the arc groove. The sliding drive assembly further includes a drive component for driving the slider to move.

[0012] Further, the two output shafts of the second wire wheel respectively penetrate through the corresponding sliders. The drive component includes transmission parts symmetrically arranged on the opposite sides of the two side plates. The transmission part includes a one-way bearing fixedly assembled on the output shaft of the second wire wheel, a gear fixedly assembled on the outside of the one-way bearing, and an arc-shaped tooth rail fixedly assembled on the side plate above the gear. The arc-shaped tooth rail meshes with the gear, and the center of the arc-shaped tooth rail coincides with the center of the arc groove.

[0013] Further, annular grooves are respectively formed in the middle of the outer sides of the first wire wheel and the second wire wheel, and the annular grooves of the first wire wheel and the second wire wheel enclose a circular through groove.

[0014] Further, annular rubber pads are respectively arranged in the annular grooves of the first wire wheel and the second wire wheel, and sinking grooves are uniformly arranged on the outer sides of the annular rubber pads.

[0015] Further, a clamping assembly is further provided on the mounting bracket between the two guiding wheel assemblies. The clamping assembly includes an upper clamping plate and a lower clamping plate. The lower clamping plate is fixedly mounted on the mounting bracket through a connecting member. The upper clamping plate is disposed above the lower clamping plate. Fixing rods are symmetrically arranged on both sides of the upper clamping plate. Collars are provided at both ends of the fixing rod, and the collars at both ends of the fixing rod are respectively sleeved on the output shafts corresponding to the two second wire wheels. Clamping grooves are symmetrically arranged on the upper clamping plate and the lower clamping plate.

[0016] Further, an L-shaped bracket is further provided on the mounting bracket. A screw rod is threadedly penetrated through the top of the L-shaped bracket. A pressing block is provided at the bottom end of the screw rod, and the pressing block is directly above the upper clamping plate. A ball is embedded at the bottom of the pressing block.

[0017] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0018] During the pulling process of the present invention, when the pulling force disappears and the cable slides to the right under its own weight, the sliding drive assembly will drive the second wire wheel to move from the initial position to the terminal position; during this process, the second wire wheel slides in an arc above the first wire wheel and the distance between the second wire wheel and the first wire wheel continuously decreases, so that the clamping force of the first wire wheel and the second wire wheel on the cable increases, and thereby the rotation of the first wire wheel and the second wire wheel is restricted, that is, the cable is clamped and locked by the first wire wheel and the second wire wheel, so as to avoid the cable from slipping and affecting the cable laying work. In addition, the arc sliding of the second wire wheel may also bend the cable to increase the contact area between the cable and the first wire wheel, thereby further improving the locking effect on the cable.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the mounting bracket and the guiding wheel assembly structure of the present invention;

[0023] Figure 3 is a simplified schematic diagram of the cable of the present invention when being pulled;

[0024] Figure 4It is a simplified schematic diagram of the cable of the present invention after the traction disappears;

[0025] Figure 5 It is a schematic structural diagram of the guiding component of the present invention;

[0026] Figure 6 It is a schematic side view structural diagram of the mounting bracket and the guiding wheel assembly of the present invention;

[0027] Figure 7 It is a schematic structural diagram of another embodiment of the present invention.

[0028] In the figure:

[0029] 1 - fixing ring; 11 - mounting strip; 2 - mounting bracket; 21 - base plate; 22 - diagonal bracing plate; 23 - diagonal bracing seat; 3 - guiding wheel assembly; 31 - support seat; 311 - bottom plate; 312 - side plate; 32 - first wire wheel; 321 - bearing seat; 33 - second wire wheel; 34 - gap; 35 - annular groove; 36 - circular through - slot; 37 - annular rubber pad; 4 - sliding drive assembly; 41 - arc groove; 42 - slider; 43 - one - way bearing; 44 - gear; 45 - arc - shaped tooth rail; 5 - clamping assembly; 51 - upper clamping plate; 52 - lower clamping plate; 53 - fixing rod; 54 - collar; 55 - wire clamping groove; 6 - L - shaped bracket; 61 - screw; 62 - pressing block. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0031] Embodiment 1, as Figure 1 shown, an overhead cable mounting bracket 2 for electric power construction includes a fixing ring 1, a mounting bracket 2 detachably mounted on the fixing ring 1, and two guiding wheel assemblies 3 detachably mounted on the mounting bracket 2 in the horizontal direction.

[0032] During electric power construction, the device can be fixed to a utility pole through the fixing ring 1, and then the cable is passed through the two guiding wheel assemblies 3 to utilize the guiding wheel assemblies 3 to support and limit the cable in the air, thereby facilitating the cable laying work for electric power construction.

[0033] As Figure 2 and Figure 6As shown, the guide wheel assembly 3 includes a support base 31, a first wire wheel 32 rotatably assembled on the support base 31, and a second wire wheel 33 slidably mounted on the support base 31 by a sliding drive assembly 4. The second wire wheel 33 is above the first wire wheel 32, and there is a gap 34 between the second wire wheel 33 and the first wire wheel 32.

[0034] Combined Figures 2 - 4 As shown, the sliding drive assembly 4 is used to drive the second wire wheel 33 to slide in an arc above the first wire wheel 32. During the arc sliding process of the second wire wheel 33, there are Figure 3 as shown in Figure 4 the initial position shown and the terminal position shown by the dotted line in

[0035] As Figure 3 shown, during the power construction process, the second wire wheels 33 of the two guide wheel assemblies 3 are both in the initial position. At this time, the gap 34 between the second wire wheel 33 and the first wire wheel 32 of the guide wheel assembly 3 is the largest. When the cable passes between the first wire wheel 32 and the second wire wheel 33, the first wire wheel 32 and the second wire wheel 33 can exert a certain pressure on the cable. During the cable laying process, the cable can be continuously pulled to move left between the first wire wheel 32 and the second wire wheel 33, and the first wire wheel 32 and the second wire wheel 33 can rotate accordingly, reducing the pulling resistance and avoiding abrasion of the cable.

[0036] As Figure 4 shown, during the pulling process, the device needs to pull the coiled cable at the right end to the left. When the pulling force disappears, the bent cable at the right end of the device will slide to the right under its own weight. At this time, the sliding drive assembly 4 is used to drive the second wire wheel 33 to move from the initial position to the terminal position; during this process, the second wire wheel 33 slides in an arc above the first wire wheel 32 and the distance between the second wire wheel 33 and the first wire wheel 32 continuously decreases, so that the clamping force of the first wire wheel 32 and the second wire wheel 33 on the cable increases, and the rotation of the first wire wheel 32 and the second wire wheel 33 is restricted accordingly, that is, the cable is clamped and locked by the first wire wheel 32 and the second wire wheel 33, so as to avoid the cable from slipping and affecting the cable laying work. In addition, the arc sliding of the second wire wheel 33 may also bend the cable to increase the contact area between the cable and the first wire wheel 32, thereby further improving the locking effect on the cable.

[0037] As Figure 1 and Figure 2 shown, in a specific embodiment of the present invention, an installation strip 11 extending axially along the fixing ring 1 is detachably installed on the fixing ring 1, the mounting bracket 2 is detachably installed on the installation strip 11, the mounting bracket 2 includes a base plate 21, a diagonal support plate 22 and a pair of diagonal support seats 23, the base plate 21 is vertically fixed on the installation strip 11, the diagonal support plate 22 is obliquely arranged below the base plate 21, the top end of the diagonal support plate 22 is fixedly connected to the end of the base plate 21 away from the installation strip 11, the bottom end of the diagonal support plate 22 is fixedly connected to the bottom end of the installation strip 11, a pair of diagonal support seats 23 are symmetrically and fixedly assembled on both sides of the base plate 21, a horizontal installation plane is arranged at the top of the diagonal support seat 23, and the support seats 31 of the two guiding wheel assemblies 3 are fixedly assembled on the two installation planes.

[0038] As Figure 5 shown, in a specific embodiment of the present invention, the support seat 31 includes a bottom plate 311 and side plates 312 symmetrically and vertically arranged on both sides of the top of the bottom plate 311. Among them, both ends of the first wire wheel 32 are rotatably installed between a pair of side plates 312 through bearing seats 321;

[0039] The sliding drive assembly 4 includes arc grooves 41 symmetrically opened on a pair of side plates 312, and sliders 42 slidably assembled in the arc grooves 41. Among them, both ends of the second wire wheel 33 are respectively rotatably matched with a pair of sliders 42. As Figure 3 shown, the center point q1 of the arc groove 41 is on one side of the center point q2 of the cross-section of the first wire wheel 32; both ends of the arc groove 41 are respectively a starting end and a terminal end. When the slider 42 is at the starting end of the arc groove 41, the second wire wheel 33 is in the aforementioned initial position at this time, and the second wire wheel 33 is directly above the first wire wheel 32. When the slider is at the terminal end of the arc groove 41, the second wire wheel 33 is obliquely above one side of the first wire wheel 32 away from the central axis of the arc groove 41. At this time, the second wire wheel 33 is in the aforementioned terminal position. The sliding drive assembly 4 further includes a drive member for driving the slider 42 to move.

[0040] As Figure 3 and Figure 4As shown, during use, driven by the driving component, a pair of sliders 42 are both at the starting end of the arc groove 41, and the second wire wheel 33 of the guiding wheel assembly 3 is correspondingly in the initial position. The gap 34 between the second wire wheel 33 and the first wire wheel 32 of the guiding wheel assembly 3 is the largest. The second wire wheel 33 and the first wire wheel 32 have sufficient pressure on the cable therebetween, that is, clamping force. Under the traction of the pulling force, the cable can move leftward between the second wire wheel 33 and the first wire, and cause the second wire wheel 33 and the first wire to rotate correspondingly. When the pulling force on the cable disappears and the cable slides rightward under its own weight, driven by the driving component, the slider 42 moves from the starting end to the terminal end of the arc groove 41. During this process, the second wire wheel 33 can approach the first wire wheel 32 and further squeeze the cable, so that the clamping force of the first wire wheel 32 and the second wire wheel 33 on the cable increases, and thereby the rotation of the first wire wheel 32 and the second wire wheel 33 is restricted, that is, the cable is clamped and locked by the first wire wheel 32 and the second wire wheel 33, so as to avoid the slipping of the cable and affect the cable laying work.

[0041] As Figure 5 shown, in a specific embodiment of the present invention, the two output shafts of the second wire wheel 33 respectively penetrate through the corresponding sliders 42. The driving component includes a transmission part symmetrically arranged on the opposite sides of the two side plates 312. The transmission part includes a one-way bearing 43 fixedly assembled on the output shaft of the second wire wheel 33, a gear 44 fixedly assembled on the outside of the one-way bearing 43, and an arc-shaped tooth rail 45 fixedly assembled on the side plate 312 above the gear 44. The arc-shaped tooth rail 45 meshes with the gear 44, and the center of the arc-shaped tooth rail 45 coincides with the center of the arc groove 41.

[0042] Combined Figure 3 with Figure 5 shown, during the process of pulling the cable, the cable moves leftward, the first wire wheel 32 rotates counterclockwise, and the second wire wheel 33 rotates clockwise. At this time, the one-way bearing 43 is in an active state, the second wire wheel 33 rotates while the gear 44 does not rotate, and under the pulling action, the second wire wheel 33 and the slider 42 are at the starting end of the arc groove 41, and the cable can be normally pulled to move leftward. When the pulling force disappears, as Figure 4 shown, when the cable moves rightward under its own gravity, the first wire wheel 32 rotates clockwise, and the second wire wheel 33 rotates counterclockwise. At this time, the one-way bearing 43 locks the rotation, the gear 44 rotates counterclockwise together with the second wire wheel 33, and through the meshing of the gear 44 and the arc-shaped tooth rail 45, the second wire wheel 33 moves from the starting end to the terminal end of the arc groove 41 to complete the bending and further clamping of the cable, so as to complete the locking of the cable.

[0043] As Figure 6As shown, in a specific embodiment of the present invention, annular grooves 35 are formed in the middle of the outer sides of the first wire wheel 32 and the second wire wheel 33, and the annular grooves 35 of the first wire wheel 32 and the second wire wheel 33 enclose a circular through groove 36. During use, the cable passes through between the circular through grooves 36, and the circular through grooves 36 can limit the lateral and vertical swinging of the cable.

[0044] In a specific embodiment of the present invention, annular rubber pads 37 are arranged in the annular grooves 35 of the first wire wheel 32 and the second wire wheel 33, and sunken grooves are evenly arranged on the outer sides of the annular rubber pads 37. To increase the friction between the first wire wheel 32 and the second wire wheel 33 and the cable.

[0045] Embodiment 2, on the basis of Embodiment 1, as Figure 7 As shown, a clamping assembly 5 is further arranged on the mounting frame 2 between the two guiding wheel assemblies 3. The clamping assembly 5 includes an upper clamping plate 51 and a lower clamping plate 52. The lower clamping plate 52 is fixedly installed on the mounting frame 2 through a connecting piece. The upper clamping plate 51 is arranged above the lower clamping plate 52. Fixing rods 53 are symmetrically arranged on both sides of the upper clamping plate 51. Sleeve rings 54 are arranged at both ends of the fixing rods 53, and the sleeve rings 54 at both ends of the fixing rods 53 are respectively sleeved on the corresponding output shafts of the two second wire wheels 33. Clamping wire grooves 55 are symmetrically arranged on the upper clamping plate 51 and the lower clamping plate 52.

[0046] During the cable pulling process, the cable between the two guiding wheel assemblies 3 rotates horizontally. The top of the lower clamping plate 52 is lower than the height of the cable. And at this time, since the second wire wheel 33 of the guiding wheel assembly 3 is at the initial position, the upper clamping plate 51 is above the cable at this time and the upper clamping plate 51 does not contact the cable. When the cable moves to the right, the second wire wheel 33 of the guiding wheel assembly 3 moves towards the terminal position. The upper clamping plate 51 can be moved to the right and accompanied by a downward movement through the clamping rods on both sides. Thus, the upper clamping plate 51 cooperates with the lower clamping plate 52 to further lock the cable.

[0047] As Figure 7 As shown, in a specific embodiment of the present invention, an L-shaped bracket 6 is further arranged on the mounting frame 2. A screw rod 61 is threadedly penetrated through the top of the L-shaped bracket 6. The bottom end of the screw rod 61 is provided with a pressing block 62, and the pressing block 62 is directly above the upper clamping plate 51. A ball is embedded at the bottom of the pressing block 62.

[0048] After the cable laying is completed, by rotating the screw rod 61, the pressing block 62 can be moved downward to push the upper clamping plate 51 to move downward and cooperate with the lower clamping plate 52 to complete the fixing work of the cable. And during the downward movement of the upper clamping plate 51, the second wire wheels 33 of the two guiding wheel assemblies 3 will also synchronously move to the terminal position, enhancing the locking effect on the cable.

[0049] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An overhead cable installation frame for electric power construction, comprising a fixing ring, a mounting frame detachably mounted on the fixing ring, and two guide wheel assemblies detachably mounted on the mounting frame in a horizontal direction; It is characterized in that The guide wheel assembly includes a support seat, a first guide wheel rotatably mounted on the support seat, and a second guide wheel slidably mounted on the support seat through a sliding drive assembly, wherein the second guide wheel is located above the first guide wheel, and there is a gap between the second guide wheel and the first guide wheel; The sliding drive assembly is used to drive the second wire wheel to slide in an arc above the first wire wheel. The second wire wheel has an initial position and a terminal position during the arc sliding process. When the second wire wheel is at the initial position, the second wire wheel is directly above the first wire wheel. When the first wire wheel is at the terminal position, the second wire wheel is obliquely above the first wire wheel. When the second wire wheel slides from the initial position to the terminal position, the gap between the second wire wheel and the first wire wheel decreases continuously, and the second wire wheel is rotationally matched with the sliding drive assembly; The support seat comprises a bottom plate and side plates symmetrically and vertically arranged on both sides of the top of the bottom plate, wherein two ends of the first wire wheel are rotatably installed between a pair of side plates through a bearing seat; The sliding drive assembly comprises arc grooves symmetrically provided on a pair of side plates, and a slider slidably assembled in the arc grooves, wherein the two ends of the second wire wheel are respectively rotatably matched with the pair of sliders, and the center point of the arc groove is located on one side of the center point of the cross section of the first wire wheel; the two ends of the arc groove are respectively a starting end and a terminal end, when the slider is at the starting end of the arc groove, the second wire wheel is located directly above the first wire wheel, and when the slider is at the terminal end of the arc groove, the second wire wheel is located obliquely above the side of the first wire wheel away from the central axis of the arc groove, and the sliding drive assembly also comprises a driving component for driving the slider to move; The two output shafts of the second wire wheel respectively pass through the corresponding sliders, and the driving component includes a transmission part symmetrically arranged on the opposite sides of two side plates, and the transmission part includes a one-way bearing fixedly assembled on the output shaft of the second wire wheel, a gear fixedly assembled on the outside of the one-way bearing, and an arc-shaped gear track fixed on the side plate above the gear, the arc-shaped gear track is meshed with the gear, and the center of the arc-shaped gear track coincides with the center of the circular arc groove.

2. The overhead cable installation frame for electric power construction according to claim 1, characterized in that: The fixing ring is detachably mounted with a mounting strip extending axially along the fixing ring, the mounting frame is detachably mounted on the mounting strip, the mounting frame comprises a base plate, a diagonal support plate and a pair of diagonal support seats, the base plate is vertically fixed on the mounting strip, the diagonal support plate is obliquely arranged below the base plate, the top end of the diagonal support plate is fixedly connected to an end of the base plate away from the mounting strip, the bottom end of the diagonal support plate is fixedly connected to the bottom end of the mounting strip, a pair of diagonal support seats are symmetrically fixedly assembled on both sides of the base plate, a horizontal mounting plane is arranged on the top of the diagonal support seat, and the support seats of the two guide wheel assemblies are fixedly assembled on the two mounting planes.

3. The overhead cable installation frame for electric power construction according to claim 1, characterized in that: An annular groove is provided in the middle of the outer sides of the first guide wheel and the second guide wheel, and the annular grooves of the first guide wheel and the second guide wheel are combined to form a circular through groove.

4. The overhead cable installation frame for electric power construction according to claim 3, characterized in that: Annular rubber pads are arranged in the annular grooves of the first guide wheel and the second guide wheel, and sink grooves are evenly arranged on the outer sides of the annular rubber pads.

5. The overhead cable installation frame for electric power construction according to claim 1, characterized in that: A clamping assembly is also provided on the mounting frame between the two guide wheel assemblies, and the clamping assembly includes an upper clamping plate and a lower clamping plate, and the lower clamping plate is fixedly mounted on the mounting frame through a connecting piece, and the upper clamping plate is arranged above the lower clamping plate, and fixing rods are symmetrically provided on both sides of the upper clamping plate, and rings are provided at both ends of the fixing rod, and the rings at both ends of the fixing rod are respectively mounted on the output shafts corresponding to the two second guide wheels, and wire clamping grooves are symmetrically provided on the upper clamping plate and the lower clamping plate.

6. The overhead cable installation frame for electric power construction according to claim 5, characterized in that: The mounting frame is also provided with an L-shaped bracket, the top thread of the L-shaped bracket is penetrated by a screw rod, the bottom end of the screw rod is provided with a pressing block, and the pressing block is located directly above the upper clamping plate, and a ball is embedded in the bottom of the pressing block.

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