Line pressing structure for incoming and outgoing lines of mining flame-proof vacuum feeder switch

Abstract

A line pressing structure for incoming and outgoing lines of a mining flame-proof vacuum feeder switch comprises an electric appliance box, and a line protecting sleeve is installed at the top of the electric appliance box. The wire protecting sleeve is formed by connecting a front protecting sleeve and a rear protecting sleeve, the rear protecting sleeve is installed on the electric appliance box, and four axial cutting grooves are formed in the front end of the rear protecting sleeve. The wire pressing structure further comprises a pair of U-shaped wire clamps, the pair of U-shaped wire clamps are oppositely arranged in the four axial cutting grooves, and U-shaped parts of the pair of U-shaped wire clamps form an annular clamping structure used for clamping incoming and outgoing wires. A bolt jacking mechanism is arranged between the pair of U-shaped wire clamps, and the pair of U-shaped wire clamps can be close to or far away from each other by rotating the bolt. According to the wire pressing structure, a notch does not need to be formed in the wire protecting sleeve, and the strength of the wire protecting sleeve is improved; the wire pressing structure is provided with the annular clamping structure, and the annular clamping structure enables the stress of each cable to be uniform and firm, thereby preventing the cable from being pulled off from the binding post.

Description

Technical Field

[0001] This utility model relates to the field of mining electrical technology, and in particular to a wire pressing structure for the incoming and outgoing lines of a mining explosion-proof vacuum feeder switch. Background Technology

[0002] See attached document Figure 1 The existing explosion-proof vacuum feeder switch for mining has an electrical box 1 with a wiring cavity containing inlet and outlet terminals. The power supply inlet and outlet are connected to the inlet and outlet terminals, respectively. Both the power supply inlet and outlet are composed of multiple cables 5. To protect the cables 5, a cable sheath 2 is installed on the wiring cavity.

[0003] During the use of explosion-proof vacuum feeder switches in mines, the power supply's incoming and outgoing lines may be pulled by external forces, posing a risk of them being pulled off the terminals. To address this, a notch is provided in the existing cable sheath 2, and a clamping plate 6 is screwed into the notch to press the cable 5 firmly against the inner wall of the sheath. This clamping method, which compresses multiple cables within a semi-circular space, has two disadvantages: firstly, the notch reduces the strength of the sheath; secondly, the cables experience uneven stress, with some cables receiving insufficient pressure and still at risk of being pulled off. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model discloses a wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch, the purpose of which is:

[0005] 1. Increase the strength of the cable sheath;

[0006] 2. Ensure that the force on each cable is even and secure, and prevent the cable from being pulled off the terminal block.

[0007] Specifically, the present invention adopts the following technical solution:

[0008] A wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch includes an electrical box with a wire protection sleeve installed on the top of the electrical box. The wire protection sleeve is composed of a front sleeve and a rear sleeve connected together, with the rear sleeve mounted on the electrical box. Four axial grooves are provided at the front end of the rear sleeve. The wire clamping structure also includes a pair of U-shaped wire clamps, which are arranged opposite each other in the four axial grooves. The U-shaped parts of the pair of U-shaped wire clamps form an annular clamping structure for clamping the incoming and outgoing lines. A bolt pressing mechanism is provided between the pair of U-shaped wire clamps, and rotating the bolt can move the pair of U-shaped wire clamps closer to or further apart.

[0009] The technical solution is further improved by providing an external thread at the front end of the rear sheath and an internal thread at the rear end of the front sheath, with the front and rear sheaths connected together by the threads.

[0010] To further improve the technical solution, a misaligned groove is provided on the U-shaped part of the U-shaped clamp, and a pair of U-shaped clamps are arranged crosswise through the misaligned groove.

[0011] To further improve the technical solution, an outward flange is provided at the end of the U-shaped clamp, and the bolt pressing mechanism is set on the outward flange.

[0012] A further improved technical solution is provided, wherein the bolt pressing mechanism includes a bolt and a nut welded to one of the outer flanges, and the bolt and nut are screwed together.

[0013] After implementing the above technical solution, the beneficial effects of this utility model compared to the prior art are:

[0014] 1. The cable sleeve has a split structure, which facilitates the installation of the U-shaped cable clamp on the cable sleeve;

[0015] 2. The cable sheath does not require notches, which increases its strength;

[0016] 3. The ring clamping structure ensures that the force on each cable is even and secure, preventing the cable from being pulled off the terminal block. Attached Figure Description

[0017] Appendix Figure 1 The diagram shows the wire clamping structure of an existing wire sheath.

[0018] Appendix Figure 2 The diagram shows the installation structure of this cable protector on the electrical box.

[0019] Appendix Figure 3 The diagram shown is a schematic representation of the overall structure of this cable sleeve.

[0020] Appendix Figure 4 The diagram shown is an exploded view of this cable sleeve.

[0021] Appendix Figure 5 The diagram shows the structure of the U-shaped clamp and the bolt pressing mechanism.

[0022] Appendix Figure 6 The diagram shows a pair of U-shaped wire clamps clamping a cable.

[0023] In the attached diagram: 1. Electrical box; 2. Cable sleeve; 21. Front sheath; 22. Rear sheath; 221. Axial groove; 222. External thread; 3. U-shaped clamp; 31. U-shaped part; 32. Misaligned groove; 33. Outward flange; 4. Bolt pressing mechanism; 41. Bolt; 42. Nut; 5. Cable; 6. Cable clamping plate. Detailed Implementation

[0024] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model. It should be noted that in the description of this utility model, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of this utility model. It should also be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] See attached document Figure 2 A mine-use explosion-proof vacuum feeder switch has a cylindrical electrical box 1. A wiring cavity is located on the top of the electrical box 1, and an inlet terminal and an outlet terminal are located within the wiring cavity. The power supply inlet and outlet are connected to the inlet terminal and outlet terminal, respectively. Both the power supply inlet and outlet are composed of multiple cables. To protect the cables, a pair of cable sheaths 2 are installed on the wiring cavity.

[0026] See attached document Figure 3 and attached Figure 4 To address the problems in the background art, this cable sheath 2 is composed of a front sheath 21 and a rear sheath 22 connected together. A wire clamping structure is provided on the cable sheath 2, which includes a pair of U-shaped wire clamps 3, and a bolt pressing mechanism 4 is provided on the U-shaped wire clamps 3.

[0027] Specifically, the rear sheath 22 has a flange at its rear end, and the rear sheath 22 is mounted on the electrical box 1 via the flange. The front end of the rear sheath 22 has an external thread 222, and the rear end of the front sheath 21 has an internal thread; the front sheath 21 and the rear sheath 22 are connected together by these threads. The front end of the rear sheath 22 also has four axial grooves 221, with the upper two grooves 221 and the lower two grooves 221 arranged parallel to each other. A pair of U-shaped clamps 3 are positioned opposite each other within the four axial grooves 221. Due to the restriction of the front sheath 21, the pair of U-shaped clamps 3 cannot slide axially along the sheath 2, but can only slide radially along the sheath 2.

[0028] See attached document Figure 4 and attached Figure 5The U-shaped wire clamp 3 is formed by bending a steel strip. The U-shaped wire clamp 3 has a U-shaped portion 31 with a staggered groove 32. A pair of U-shaped wire clamps 3 can be arranged crosswise through the staggered groove 32. An outward flange 33 is provided at the end of each U-shaped wire clamp 3, and a bolt pressing mechanism 4 is provided on one of the outward flanges 33. The bolt pressing mechanism 4 includes a bolt 41 and a nut 42 welded to the outward flange 33. The bolt 41 and the nut 42 are screwed together. Rotating the bolt 41 can move a pair of U-shaped wire clamps 3 closer together or further apart.

[0029] See attached document Figure 6 In use, the cable 5 is threaded into the sheath 2, and then the bolt 41 is rotated to move the pair of U-shaped clamps 3 away from each other. At this time, the U-shaped parts 31 of the pair of U-shaped clamps 3 form a circular clamping structure, suspending and clamping the cable 5. Compared with the semi-circular compression structure of the existing sheath 2, this clamping structure can ensure that each cable 5 is subjected to uniform force and is reliably fixed. Since the sheath 2 has no notches, it will not reduce the overall strength of the sheath 2.

[0030] The parts not detailed herein are prior art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of protection of which is defined by the appended claims and their equivalents.

Claims

1. A wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch, comprising an electrical box, wherein a protective sleeve is installed on the top of the electrical box, characterized in that: The cable sheath is composed of a front sheath and a rear sheath connected together. The rear sheath is installed on the electrical box and has four axial grooves at the front end. The cable clamping structure also includes a pair of U-shaped clamps, which are arranged opposite each other in the four axial grooves. The U-shaped parts of the pair of U-shaped clamps form an annular clamping structure for clamping the incoming and outgoing cables. A bolt pressing mechanism is provided between the pair of U-shaped clamps. Rotating the bolt can make the pair of U-shaped clamps move closer or further apart.

2. The wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch as described in claim 1, characterized in that: The front end of the rear sheath has an external thread, and the rear end of the front sheath has an internal thread. The front and rear sheaths are connected together by the threads.

3. The wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch as described in claim 1, characterized in that: The U-shaped part of the U-shaped clamp is provided with a staggered groove, and a pair of U-shaped clamps are arranged crosswise through the staggered groove.

4. The wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch as described in claim 1, characterized in that: The U-shaped clamp has an outward flange at its end, and the bolt pressing mechanism is located on the outward flange.

5. The wire clamping structure for the incoming and outgoing lines of a mine explosion-proof vacuum feeder switch as described in claim 4, characterized in that: The bolt pressing mechanism includes a bolt and a nut welded to one of the outer flanges, with the bolt and nut screwed together.

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