Anti-loosening electric power fitting fixing clamp

Abstract

The invention provides an anti-loosening electric power fitting fixing clamp, and belongs to the field of strain clamps, and the anti-loosening electric power fitting fixing clamp comprises a wedge-shaped shell, the wedge-shaped shell is provided with a wedge-shaped groove, the top surface of the wedge-shaped shell is provided with a mounting groove, a spring is arranged in the mounting groove, one end of the spring is provided with a sliding block, and a strip-shaped hole which is communicated with the mounting groove and the wedge-shaped groove is formed between the mounting groove and the wedge-shaped groove; a fixing assembly is arranged on the inner side of the wedge-shaped groove and comprises a first clamping block and a second clamping block. According to the clamping device, the wedge-shaped shell, the first clamping block, the second clamping block and the sliding block are arranged, the first clamping block and the second clamping block are both assembled in the wedge-shaped shell in advance, the first clamping block and the second clamping block are both limited by the sliding block, and the sliding block is subjected to extrusion force of the spring, so that the first clamping block and the second clamping block can keep a stable connection relation with the wedge-shaped shell; on-site assembling and debugging work is reduced, and use convenience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of tension wire clamps, and in particular to an anti-loosening electric power hardware fixing clamp. Background Art

[0002] With the rapid development of economy, my country's power grid has entered a new stage characterized by ultra-high voltage, long distance and large capacity. The construction of ultra-high voltage transmission lines is changing with each passing day. The research and analysis of large-section conductors and corresponding power fittings are also continuously advancing. The tension clamps required for large-section overhead conductors are also constantly updated.

[0003] In the prior art, there is a cable tension holding mechanism with announcement number CN117977470A, which clamps the cable by two symmetrically installed wedges, so that the cable has a suitable tension, avoids shaking, and ensures that the power can be transmitted normally;

[0004] However, when the device is actually used, the two wedges need to be accurately installed in the wedge-shaped installation cavity to ensure the accuracy of the clamping position and the reasonable distribution of the clamping force. It is difficult for personnel to control the position between the wedge-shaped housing, the wedge and the wire during actual operation, so it is not convenient and fast enough;

[0005] Therefore, an anti-loosening electric hardware fixing fixture is proposed to meet the demand. Summary of the invention

[0006] In view of this, the purpose of the present application is to provide an anti-loosening electric hardware fixing clamp to facilitate clamping of cables while maintaining good tension of the cables.

[0007] In order to solve the above technical problems, this application provides the following technical solutions:

[0008] A loose-proof electric hardware fixing fixture comprises a wedge-shaped shell, the wedge-shaped shell is provided with a wedge-shaped groove, the top surface of the wedge-shaped shell is provided with a mounting groove, a spring is provided inside the mounting groove, a slider is provided at one end of the spring, a bar-shaped hole that intersects with the mounting groove and the wedge-shaped groove is provided, a fixing component is provided inside the wedge-shaped groove, the fixing component comprises a clamping block 1 and a clamping block 2, a side wall of the clamping block is provided with a protrusion 1, a side wall of the clamping block is provided with a protrusion 2, the protrusion 1 and the protrusion 2 are fitted together along the axial direction of the wedge-shaped shell, the clamping block 1 and the clamping block 2 are respectively connected to two sliders, and the sliders are fitted to the side walls of the mounting groove at the top of the wedge-shaped shell.

[0009] Preferably, the surfaces adjacent to the first and second clamping blocks are provided with concave arc grooves, the upper surface of the first protrusion is tangent to the concave arc groove of one side wall of the clamping block, and the top surface of the second protrusion is tangent to the concave arc groove of the side wall of the second clamping block.

[0010] Preferably, the bottom of the clamping block 1 is provided with a groove facing the protruding block 2, and the bottom of the clamping block 2 is provided with a groove facing the protruding block 1;

[0011] A side wall of the protrusion 1 facing the protrusion 2 is provided with a step 1, and a side wall of the protrusion 2 facing the protrusion 1 is provided with a step 2;

[0012] An adjusting block is also arranged on the top of the clamping block 1, and a round hole is opened on the side wall of the adjusting block.

[0013] Preferably, the side of the protrusion 1 facing the clamping block 2 is an inclined surface, and the inclined direction extends from the wide end opening of the wedge-shaped shell to the narrow end opening, and the bottom surface of the protrusion 1 is in contact with the bottom side wall of the wedge-shaped groove of the wedge-shaped shell.

[0014] Preferably, a protrusion three is provided at the bottom of the clamping block two, and the upper surface of the protrusion three is in the same horizontal plane as the upper surface of the protrusion two.

[0015] Preferably, the vertical side walls of the wedge-shaped groove of the wedge-shaped housing are provided with limit strips, and the clamping block 1 and the clamping block 2 are respectively clamped on the outer sides of the two limit strips.

[0016] Preferably, a sliding groove is provided on the bottom side wall of the wedge-shaped groove of the wedge-shaped housing, and a limiting block is provided on the bottom side wall of the clamping block 2.

[0017] Preferably, both ends of the side wall of the wedge-shaped housing are provided with connecting arms, and the ends of the connecting arms are penetrated with connecting shafts;

[0018] A groove is arranged on the top of the connecting arm, and the groove on the top of the connecting arm is butted against one end of the bottom sliding groove of the wedge-shaped groove of the wedge-shaped housing.

[0019] Preferably, a support plate is provided in the middle of the side wall of the wedge-shaped shell, and the upper surface of the support plate is in the same horizontal plane as the bottom side wall of the wedge-shaped groove of the wedge-shaped shell.

[0020] Preferably, reinforcing ribs are distributed on the outer side wall of the wedge-shaped shell, and a connecting lug is also provided on one side of the wedge-shaped shell.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] In the present invention, a wedge-shaped shell, a clamp block 1, a clamp block 2 and a slider are provided, the clamp block 1 and the clamp block 2 are pre-assembled inside the wedge-shaped shell, the clamp block 1 and the clamp block 2 are limited by the slider, and the slider is subjected to the extrusion force of the spring, so that the clamp block 1 and the clamp block 2 can maintain a stable connection relationship with the wedge-shaped shell, reducing on-site assembly and debugging work and improving the convenience of use.

[0023] In the present invention, by arranging clamp block 1, clamp block 2, protrusion 1, protrusion 2, step 1 and step 2, the cooperation of protrusion 1 and protrusion 2 enables clamp block 1 and clamp block 2 to move synchronously, so as to facilitate the installation of the wire between clamp block 1 and clamp block 2. When step 1 and step 2 are engaged with each other, clamp block 1 and clamp block 2 are positioned. The operator does not need to continuously apply force to clamp block 1, and there is no need to resist the resistance of the spring at this time, so that the wire is conveniently placed between clamp block 1 and clamp block 2, and the installation process is more convenient.

[0024] In the present invention, by providing protrusion one, protrusion two and protrusion three, protrusion one presses protrusion three, so that clamping block two and clamping block one move synchronously along the wedge groove, thereby achieving the goal of gripping the wire, reducing the docking steps, improving the installation accuracy and simplifying the entire installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0026] Figure 1 It is a schematic diagram of the overall structure in this application;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the wedge-shaped shell in this application;

[0028] Figure 3 This is a schematic diagram of the structure of the clamp block 2 in this application;

[0029] Figure 4 This is a schematic diagram of the structure of a bump in this application;

[0030] Figure 5 This is a schematic diagram of the structure of the clamp block 1 in this application;

[0031] Figure 6 For this application Figure 3 The enlarged structural diagram at A in the middle;

[0032] Figure 7 This is a schematic diagram of the reinforcing rib structure in this application;

[0033] [reference numerals]

[0034] 1. Wedge-shaped shell; 101. Spring; 102. Slider; 103. Limiting strip; 104. Support plate; 105. Reinforcing rib; 106. Connecting ear; 2. Clamping block 1; 201. Bump 1; 202. Step 1; 203. Adjusting block; 3. Clamping block 2; 301. Bump 2; 302. Step 2; 303. Bump 3; 304. Limiting block; 4. Connecting arm; 401. Connecting shaft. DETAILED DESCRIPTION

[0035] The following is a detailed description of an anti-loosening electric hardware fixing fixture provided by the present application in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods for some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present application.

[0036] like Figure 1 and Figure 2 The embodiment of the present application provides an anti-loosening electric hardware fixing fixture, including a wedge-shaped shell 1, the wedge-shaped shell 1 is provided with a wedge-shaped groove, the top surface of the wedge-shaped shell 1 is provided with a mounting groove, a spring 101 is provided inside the mounting groove, a slider 102 is provided at one end of the spring 101, a bar-shaped hole that intersects with the mounting groove and the wedge-shaped groove is provided, a fixing component is provided inside the wedge-shaped groove, the fixing component includes a clamping block 1 2 and a clamping block 2 3, a protrusion 1 201 is provided on the side wall of the clamping block 1 2, a protrusion 2 301 is provided on the side wall of the clamping block 2 3, the protrusion 1 201 and the protrusion 2 301 are fitted along the axial direction of the wedge-shaped shell 1, the clamping block 1 2 and the clamping block 2 3 are respectively connected to two sliders 102, and the slider 102 is fitted to the side wall of the mounting groove at the top of the wedge-shaped shell 1;

[0037] The clamp block 1 2 and the clamp block 2 3 are both pre-assembled inside the wedge-shaped housing 1, and no on-site assembly is required, which reduces the difficulty of operation. The clamp block 1 2 and the clamp block 2 3 are both limited by the slider 102, thereby preventing the clamp block 1 2 and the clamp block 2 3 from being separated from the wedge-shaped housing 1. At the same time, the clamp block 1 2 and the clamp block 2 3 are limited to slide only in the wedge-shaped groove, and the slider 102 is squeezed by the spring 101, so that when no external force is applied, the clamp block 1 2 and the clamp block 2 3 can maintain a stable connection relationship with the wedge-shaped housing 1, reducing the preparation work before installation;

[0038] At the same time, the slider 102 abuts against the wedge-shaped housing 1, and the slider 102 can disperse the reaction force of the wire on the clamping block 1 2 and the clamping block 2 3, so as to avoid the tip of the clamping block 1 2 from being deformed and bent due to the force;

[0039] Before installing the wire, slide the clamping block 2 toward the wide end of the wedge-shaped housing 1 to overcome the resistance of the spring 101, and the protrusion 201 on the clamping block 2 synchronously squeezes the protrusion 301, so that the clamping block 12 and the clamping block 23 move synchronously, and the clamping block 12 and the clamping block 23 both move toward the wide end of the wedge-shaped groove, and the gap between the clamping block 12 and the clamping block 23 expands, so that the operator can easily install the wire between the clamping block 12 and the clamping block 23;

[0040] During the installation process, after the position between the wire and the clamping block 2 is accurately aligned, the control of the clamping block 2 is released to allow the spring 101 to squeeze the slider 102, and the clamping block 12 and the clamping block 2 3 move synchronously toward the narrow end of the wedge-shaped groove. During this process, the clamping block 1 2 and the clamping block 2 3 are squeezed by the side wall of the wedge-shaped shell 1 to generate a gripping force to clamp the wire, making the entire installation process convenient.

[0041] In this embodiment, Figure 2-Figure 7 As shown, the surfaces adjacent to the clamping block 1 2 and the clamping block 2 3 are provided with concave arc grooves, the upper surface of the protrusion 1 201 is tangent to the concave arc grooves on the side walls of the clamping block 1 2, and the top surface of the protrusion 2 301 is tangent to the concave arc grooves on the side walls of the clamping block 2 3;

[0042] The concave arc groove between the clamping block 1 2 and the clamping block 2 3 can better fit the outer surface shape of the wire, and sufficient contact area is ensured between the clamping block 1 2, the clamping block 2 3 and the wire to ensure the stability of the clamping force and the good friction of the clamping surface, thereby preventing the wire from loosening, thereby facilitating the maintenance of the wire tension;

[0043] At the same time, the protrusion 1 201 and the protrusion 2 301 can prevent the wire from being stuck at the bottom of the clamping block 1 2 and the clamping block 2 3 during the installation process, and play a limiting role.

[0044] The bottom of the clamping block 1 2 is provided with a groove facing the protrusion 2 301, and the bottom of the clamping block 2 3 is provided with a groove facing the protrusion 1 201;

[0045] A step 1 202 is provided on one side wall of the protrusion 1 201 facing the protrusion 2 301 , and a step 2 302 is provided on one side wall of the protrusion 2 301 facing the protrusion 1 201 ;

[0046] An adjusting block 203 is also provided on the top of the clamping block 2, and a circular hole is provided on the side wall of the adjusting block 203;

[0047] The grooves at the bottom of the clamping block 1 2 and the clamping block 2 3 can conveniently accommodate the protrusion 1 201 and the protrusion 2 301, so as to ensure that the clamping block 1 2 and the clamping block 2 3 can fit together, and the concave arc grooves between the clamping block 1 2 and the clamping block 2 3 can be connected to form a circular hole, so as to wrap the outer surface of the wire in all directions, ensure sufficient contact area, so as to ensure the stability of the clamping force and the good friction of the clamping surface;

[0048] In addition, the cooperation between the clamping block 1 2 and the protruding block 2 301, and the cooperation between the clamping block 2 3 and the protruding block 1 201 can stabilize the positions of the clamping blocks 1 2 and 2 3, avoid tilting between the clamping blocks 1 2 and 2 3, and make the movements of the clamping blocks 1 2 and 2 3 more accurate and stable;

[0049] The position of the clamping block 2 can be conveniently adjusted by the adjusting block 203. The adjusting block 203 is far away from the clamping part of the clamping block 2, thereby avoiding interference with the position of the wire when adjusting the position of the clamping block 2, so that the position of the wire and the clamping block 2 remains accurate and stable.

[0050] When the clamping block 2 is slid toward the wide end of the wedge-shaped housing 1, the protrusion 1 201 squeezes the protrusion 2 301 until the step 1 202 and the step 2 302 automatically engage with each other to form a locked state. The protrusion 1 201 and the protrusion 2 301 cannot be relatively close to each other, thereby positioning the clamping block 1 2 and the clamping block 2 3. The operator does not need to continue to apply force to the clamping block 2, and there is no need to resist the resistance of the spring 101. This makes it easy for the operator to place the wire between the clamping block 1 2 and the clamping block 2 3, and the installation process is more convenient.

[0051] The side of the protrusion 1 201 facing the clamping block 2 3 is an inclined surface, and the inclined direction extends from the wide end opening of the wedge-shaped housing 1 to the narrow end opening, and the bottom surface of the protrusion 1 201 is attached to the bottom side wall of the wedge-shaped groove of the wedge-shaped housing 1;

[0052] The bottom of the clamp block 2 3 is provided with a protrusion 303 , and the upper surface of the protrusion 303 is in the same horizontal plane as the upper surface of the protrusion 2 301 ;

[0053] When the protrusion 1 201 squeezes the protrusion 2 301 until the step 1 202 and the step 2 302 are engaged with each other, after the wire and the clamping block 1 2 are connected, in order to release this state, a first method is provided: slide the clamping block 2 3 toward the wide end of the wedge-shaped groove so that the step 1 202 and the step 2 302 are no longer engaged, and the clamping block 1 2 moves along the wedge-shaped groove under the action of the spring 101 on the same side thereof, and then the protrusion 1 201 immediately squeezes the protrusion 3 303, so that the clamping block 2 3 moves along the wedge-shaped groove, thereby releasing the clamping block 1 2, and the clamping block 1 2 and the clamping block 2 3 can hold the wire tightly, making the entire installation process simple;

[0054] A second method is provided, wherein the clamping block 2 is slid toward the wide end of the wedge-shaped groove, and when the step 1 202 and the step 2 302 are engaged, the protrusion 1 201 continues to squeeze the protrusion 2 301, and as the distance between the clamping block 1 2 and the clamping block 2 3 increases, the distance between the protrusion 1 201 and the protrusion 2 301 increases, and then the step 1 202 and the step 2 302 are disengaged, and at this time, the clamping block 2 3 moves toward the narrow end of the wedge-shaped groove under the action of the spring 101 on the same side thereof, and the side wall of the protrusion 2 301 includes an inclined surface, and at this time, the inclined surface abuts against the protrusion 1 201, thereby releasing the clamping block 2, and the clamping block 2 3 first returns to the narrow end of the wedge-shaped groove, and then the clamping block 2 returns to the narrow end of the wedge-shaped groove under the action of the spring 101 on the same side thereof, thereby completing the gripping of the wire;

[0055] In the above process, the clamping block 1 2 is supported by the protrusion 1 201, and the clamping block 2 3 is supported by the protrusion 2 301 and the protrusion 3 303, so that the clamping block 1 2 and the clamping block 2 3 can be stably connected to the wedge-shaped housing 1;

[0056] When clamping block 1 2 is fitted with clamping block 2 3 , protrusion 1 201 is located at the bottom of clamping block 2 3 , protrusion 2 301 and protrusion 3 303 are located at the bottom of clamping block 1 2 , and the connection between clamping block 1 2 and clamping block 2 3 is more stable.

[0057] The vertical side walls of the wedge-shaped groove of the wedge-shaped housing 1 are provided with limit strips 103, and the clamping block 1 2 and the clamping block 2 3 are respectively clamped on the outer sides of the two limit strips 103;

[0058] The limiting strip 103 plays a good guiding and limiting role for the clamping block 1 2 and the clamping block 2 3, preventing the clamping block 1 2 and the clamping block 2 3 from escaping from the wedge-shaped groove, and improving the stability of the movement of the clamping block 1 2 and the clamping block 2 3, reducing the docking steps during the installation process, and providing convenience for the installation process.

[0059] The bottom side wall of the wedge-shaped groove of the wedge-shaped housing 1 is provided with a sliding groove, and the bottom side wall of the clamping block 2 3 is provided with a limiting block 304;

[0060] The sliding groove is provided so that the clamp block 2 3 can be displaced a longer distance relative to the clamp block 1 2 in the wedge-shaped housing 1, and when the engagement state between the step 1 202 and the step 2 302 is released, the clamp block 2 3 is prevented from being separated from the wedge-shaped housing 1, thereby ensuring the stability of the clamp block 2 3.

[0061] Connecting arms 4 are provided at both ends of the side wall of the wedge-shaped housing 1, and connecting shafts 401 are passed through the ends of the connecting arms 4;

[0062] A groove is provided on the top of the connecting arm 4, and the groove on the top of the connecting arm 4 is butted against one end of the sliding groove at the bottom of the wedge-shaped groove of the wedge-shaped housing 1;

[0063] The connecting arm 4 and the connecting shaft 401 facilitate the connection of the entire device with the tension string group or the pole tower, and the integral casting has good mechanical strength and precision;

[0064] A groove is further provided on the connecting arm 4 so that the clamp block 2 3 can be displaced a longer distance in the wedge groove relative to the clamp block 1 2 , thereby ensuring the stability of the clamp block 2 3 when the engagement state between the step 1 202 and the step 2 302 is released.

[0065] A support plate 104 is provided in the middle of the side wall of the wedge-shaped housing 1, and the upper surface of the support plate 104 is in the same horizontal plane as the bottom side wall of the wedge-shaped groove of the wedge-shaped housing 1;

[0066] The support plate 104 supports and lifts the wire in the wedge-shaped groove, which can reduce the shaking of the wire, so that the wire is stably fixed between the clamping block 1 2 and the clamping block 2 3, and the looseness of the wire is reduced.

[0067] The outer side wall of the wedge-shaped housing 1 is provided with reinforcing ribs 105, and one side of the wedge-shaped housing 1 is also provided with a connecting lug 106;

[0068] The reinforcing ribs 105 improve the overall strength of the wedge-shaped housing 1 and prevent the wedge-shaped housing 1 from being deformed. Meanwhile, the designed connecting lugs 106 facilitate the mooring of the wedge-shaped housing with external cables, and the housing has a strong integrity.

[0069] Among them, an end cover is provided on the top of the wedge-shaped shell 1 for closing the top opening of the installation groove, and the end cover is fixed to the wedge-shaped shell 1 by three rivets.

Claims

1. A fixing fixture for preventing loosening of electric hardware, characterized in that: The invention comprises a wedge-shaped shell (1), wherein the wedge-shaped shell (1) is provided with a wedge-shaped groove, the top surface of the wedge-shaped shell (1) is provided with a mounting groove, a spring (101) is provided inside the mounting groove, a slider (102) is provided at one end of the spring (101), a bar-shaped hole intersecting with the mounting groove is provided between the mounting groove and the wedge-shaped groove, a fixing component is provided inside the wedge-shaped groove, the fixing component comprises a clamping block 1 (2) and a clamping block 2 (3), the side wall of the clamping block 1 (2) is provided with a protrusion 1 (201), the side wall of the clamping block 2 (3) is provided with a protrusion 2 (301), the protrusion 1 (201) and the protrusion 2 (301) are fitted together along the axial direction of the wedge-shaped shell (1), the clamping block 1 (2) and the clamping block 2 (3) are respectively connected to two sliders (102), and the sliders (102) are fitted to the side walls of the mounting groove at the top of the wedge-shaped shell (1).

2. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: The surfaces of the clamping block 1 (2) and the clamping block 2 (3) adjacent to each other are provided with concave arc grooves, the upper surface of the protruding block 1 (201) is tangent to the concave arc grooves of the side walls of the clamping block 1 (2), and the top surface of the protruding block 2 (301) is tangent to the concave arc grooves of the side walls of the clamping block 2 (3).

3. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: The bottom of the clamping block 1 (2) is provided with a groove facing the protruding block 2 (301), and the bottom of the clamping block 2 (3) is provided with a groove facing the protruding block 1 (201); A side wall of the protrusion 1 (201) facing the protrusion 2 (301) is provided with a step 1 (202), and a side wall of the protrusion 2 (301) facing the protrusion 1 (201) is provided with a step 2 (302); An adjusting block (203) is also provided on the top of the clamping block 1 (2), and a circular hole is provided on the side wall of the adjusting block (203).

4. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: The side of the protrusion 1 (201) facing the clamping block 2 (3) is an inclined surface, and the inclined direction extends from the wide end opening of the wedge-shaped shell (1) to the narrow end opening, and the bottom surface of the protrusion 1 (201) is in contact with the bottom side wall of the wedge-shaped groove of the wedge-shaped shell (1).

5. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: A convex block 3 (303) is provided at the bottom of the clamp block 2 (3), and the upper surface of the convex block 3 (303) is in the same horizontal plane as the upper surface of the convex block 2 (301).

6. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: The vertical side walls of the wedge-shaped groove of the wedge-shaped housing (1) are all provided with limit strips (103), and the clamping block 1 (2) and the clamping block 2 (3) are respectively clamped on the outside of the two limit strips (103).

7. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: A sliding groove is provided on the bottom side wall of the wedge-shaped groove of the wedge-shaped housing (1), and a limiting block (304) is provided on the bottom side wall of the clamp block 2 (3).

8. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: Both ends of the side wall of the wedge-shaped housing (1) are provided with connecting arms (4), and the ends of the connecting arms (4) are provided with connecting shafts (401); The top of the connecting arm (4) is provided with a groove, and the groove at the top of the connecting arm (4) is butted against one end of a sliding groove at the bottom of the wedge-shaped groove of the wedge-shaped housing (1).

9. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: A support plate (104) is provided in the middle of the side wall of the wedge-shaped housing (1), and the upper surface of the support plate (104) is in the same horizontal plane as the bottom side wall of the wedge-shaped groove of the wedge-shaped housing (1).

10. The anti-loosening electric power fitting fixing fixture according to claim 1, characterized in that: The outer side wall of the wedge-shaped shell (1) is provided with reinforcing ribs (105), and one side of the wedge-shaped shell (1) is also provided with a connecting lug (106).

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