Crimping-free terminal of rail transit cable

Abstract

The utility model discloses a crimping-free terminal of a rail transit cable, comprising a terminal body, the terminal body comprises a torsion terminal hole, a body first end and a body second end, and the torsion terminal hole is a threaded hole; the size of the torsion terminal is matched with that of the torsion terminal open hole, the torsion terminal is twisted into the torsion terminal open hole, and the torsion terminal fixes a cable; the busbar wiring part is connected with the first end of the body, the busbar wiring part is provided with a mounting hole, and the busbar wiring part is used for mounting a crimping-free terminal on a busbar through the mounting hole; and the waterproof and rain-proof skirt is connected with the second end of the body, and the waterproof and rain-proof skirt is used for preventing rainwater from invading.

Description

Technical Field

[0001] The present application relates to the field of rail transit, and in particular to a crimp-free terminal for rail transit cables. Background Art

[0002] In recent years, with the continuous increase in subway mileage, metro capacity has also reached new highs. As of December 2020, the Shanghai Metro's operating mileage exceeded 700 kilometers. Simultaneously, with the growing passenger volume of Shanghai's rail transit, the capacity of various lines has continued to increase, and the operating hours of various lines have been extended. This has significantly compressed the time it takes to repair section cable faults. The usual three-hour nighttime work window has been reduced to less than one hour, making cable maintenance and emergency rescue tasks more difficult. Since 2000, numerous DC repair incidents have occurred, often requiring simultaneous handling of several or even dozens of faults.

[0003] Traditional DC cable maintenance methods exhibit significant shortcomings when dealing with sudden failures. First, before crimping the cable, the connectors must be treated, their oxide film removed, and cleaned to remove any impurities. Second, when using conventional connectors for crimping, uneven pressure points can result in uneven pressure distribution, leading to burrs. After crimping, the edges of the connectors must be polished to remove burrs. However, this burr removal process generates a large amount of metal powder, which can contaminate the insulation and reduce insulation performance. Third, after each crimping cycle, the crimping pliers must wait for at least 20 seconds before releasing the die to minimize metal creep. Furthermore, the spacing between two crimping points should be kept minimal, as this can loosen the previous crimping point and result in substandard crimping. The national standard GB / T 9327-2008 specifies specific requirements for crimping die dimensions, crimping spacing, distance from the pipe opening, and waiting time. Therefore, this process requires highly qualified technicians and places high demands on their experience and skills. Traditional DC cable maintenance methods take 20-40 minutes to complete, making them inadequate for more severe, sudden cable failures. Utility Model Content

[0004] In order to solve the above problems, the purpose of the present application is to provide a quick-install crimp-free terminal that can shorten the maintenance time of rail transit cables.

[0005] The present application provides a crimp-free terminal for a rail transit cable, comprising:

[0006] A terminal body, the terminal body comprising a torque terminal opening, a first end of the body, and a second end of the body, the torque terminal opening being a threaded hole;

[0007] A torque terminal, the size of which matches the torque terminal opening, the torque terminal being twisted into the torque terminal opening, and the torque terminal fixing the cable;

[0008] A busbar connection portion, the busbar connection portion being connected to the first end of the body, the busbar connection portion having a mounting hole, and the busbar wiring portion mounting the crimp-free terminal on the busbar through the mounting hole;

[0009] A waterproof rain skirt is connected to the second end of the body, and the waterproof rain skirt prevents rainwater from intruding.

[0010] Furthermore, the crimp-free terminal of the rail transit cable, the torque terminal includes:

[0011] Nut;

[0012] a first stud, the first stud being provided at an end portion of the torque terminal;

[0013] a first twist-off rod, the first twist-off rod being fixedly connected to the first stud;

[0014] a second stud fixedly connected to the first twist-off rod;

[0015] a second twist-off rod, one end of the second twist-off rod being fixedly connected to the nut, and the other end of the second twist-off rod being fixedly connected to the second stud;

[0016] The first twist-off rod and the second twist-off rod are twisted off from the torque terminal according to the thickness of the cable.

[0017] Furthermore, in the crimp-free terminal of the rail transit cable, the nut, the first stud, the first twist-off rod, the second stud and the second twist-off rod are integrally formed.

[0018] Furthermore, in the crimp-free terminal of the rail transit cable, at least two torque terminal openings are provided, and the axial angles thereof are set at 90° to each other.

[0019] Furthermore, the crimp-free terminal of the rail transit cable has the mounting hole comprising a long waist hole and a round hole.

[0020] Furthermore, the crimp-free terminal of the rail transit cable is made of a terminal body made of a sixth series aluminum alloy, and the torsion terminal is made of a seventh series aluminum alloy.

[0021] Furthermore, the crimp-free terminal of the rail transit cable has a busbar connection portion that is a plate-like structure and a thickness of not less than 10 mm.

[0022] Furthermore, the crimp-free terminal of the rail transit cable has a terminal body forged from aluminum alloy billet with a density of 2.8 g / cm.

[0023] Furthermore, the crimp-free terminal of the rail transit cable, the busbar wiring part also includes a quick-release card slot, the width of the quick-release card slot is 24 mm, and the depth of the quick-release card slot is greater than 3 mm.

[0024] Furthermore, the crimp-free terminal of the rail transit cable has the terminal body, busbar connection part and waterproof rain skirt formed in one piece.

[0025] The technical solution provided by the embodiments of the present application has the following advantages:

[0026] 1. Due to the provision of torque terminals and torque terminal openings, the cable can be fixed without the need for a hydraulic oil pump and crimping pliers;

[0027] 2. The waterproof rain skirt effectively prevents rainwater from invading the cable core outdoors;

[0028] 3. The first and second twist-off rods of the torque terminal are provided to adapt to cable cores of different thicknesses;

[0029] 4. The quick-release slot allows for quick bolt fixation, shortening installation time.

[0030] 5. Due to the provision of round holes and long waist holes, it can match the contact network switch busbars with different spacings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to scale.

[0034] Figure 1 This is a schematic diagram of a crimp-free terminal for rail transit cables preferably used in an embodiment of the utility model;

[0035] Figure 2A schematic diagram of a preferred torque terminal according to an embodiment of the present utility model;

[0036] Figure 3 This is a schematic diagram of the preferred torque terminal and torque terminal opening matching according to an embodiment of the present utility model.

[0037] Reference numerals:

[0038] Terminal body 1;

[0039] Torque terminal opening 11;

[0040] a first end 12 of the body;

[0041] body second end 13;

[0042] Busbar connection part 2;

[0043] Mounting hole 21;

[0044] Long waist hole 211;

[0045] round hole 212;

[0046] Quick release card slot 22;

[0047] Torque terminal 3;

[0048] Nut 31;

[0049] a first stud 32;

[0050] First twist-off lever 33;

[0051] a second stud 34;

[0052] Second twist-off rod 35;

[0053] Waterproof rain skirt4. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be understood as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0055] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "install", "connect", "connect" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0056] Figure 1 This is a schematic diagram of a crimp-free terminal for rail transit cables, which is preferred in an embodiment of the present utility model. Figure 2 Schematic diagram of a preferred torque terminal according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the preferred torque terminal and torque terminal opening according to the embodiment of the present invention. Figure 1-3 As shown, a crimp-free terminal for rail transit cables includes a terminal body 1, a torque terminal opening 11, a first end 12, and a second end 13. The torque terminal opening 11 is a threaded hole. In this embodiment, at least two torque terminal openings are preferably provided, arranged at a 90° axial angle relative to each other. This 90° axial angle better secures the cable core.

[0057] The torque terminal 3 has a size that matches the torque terminal opening 11 . The torque terminal 3 is twisted into the torque terminal opening 11 to fix the cable.

[0058] Specifically, the torque terminal 3 includes: a nut 31; a first stud 32, which is arranged at the end of the torque terminal 3; a first twist-off rod 33, which is fixedly connected to the first stud 32; and a second stud 34, which is fixedly connected to the first twist-off rod 33. A second twist-off rod 35, one end of which is fixedly connected to the nut 31, and the other end of which is fixedly connected to the second stud 34; wherein the first twist-off rod 33 and the second twist-off rod 35 are twisted off from the torque terminal 3 according to the thickness of the cable. In this embodiment, the nut 31, the first stud 32, the first twist-off rod 33, the second stud 34, and the second twist-off rod 35 are preferably formed in one piece. The two-layer structure can adapt to the deviation of the wire core. If the wire core is too thick, the bottom will be twisted off, and if the wire core is too thin, the top will be twisted off. When in use, only a ratchet wrench is needed, and no hydraulic oil pump and crimping pliers are required. The cable terminal can be quickly installed mainly by relying on the torque terminal 3.

[0059] The busbar connection portion 2 is connected to the first end 12 of the main body and has mounting holes 21 through which the crimp-free terminals are mounted on the busbar. In this embodiment, the mounting holes 21 preferably include an elongated hole 211 and a round hole 212. The provision of both elongated holes 211 and round holes 212 accommodates busbar installation requirements with varying hole spacing.

[0060] A waterproof rain skirt 4 is connected to the second end 13 of the main body to prevent rainwater from entering. Outdoor cable terminals are often exposed to the sun and rain, and over time, the waterproofing can deteriorate. Rainwater can flow along the connecting pipe wall into the cable core, causing overflow in the substation switch cabinet. With this improvement, rainwater flows along the cable surface rather than into the cable core, effectively preventing water from leaking into the core.

[0061] Preferably, the terminal body 1 is made of a VI series aluminum alloy, while the torque terminal 3 is made of a VII series aluminum alloy, with a tinned surface. The terminal body 1 is forged from aluminum alloy billets with a density of 2.8 g / cm3. The density of the terminal body 1 is 2.5 g / cm3 before forging and 2.8 g / cm3 after forging, resulting in improved conductivity.

[0062] Preferably, the busbar connection portion 2 is a plate-like structure, and the thickness of the busbar connection portion is not less than 10 mm. In this embodiment, preferably, the busbar connection portion 2 of the plate-like structure has a thickness of not less than 10 mm at its thinnest point.

[0063] Preferably, the busbar connection portion 2 also includes a quick-release slot 22. To facilitate rapid on-site installation and maintenance, the quick-release slot 22 is 24 mm wide and greater than 3 mm deep. The quick-release slot 22 secures the bolts, requiring only the nuts to be tightened during installation, significantly reducing installation time.

[0064] Preferably, the terminal body 1, the busbar connection portion 2 and the waterproof rain skirt 4 are integrally formed. Integral forming can increase the overall rigidity.

[0065] During use, the crimp-free terminal secures the cable core to the terminal body 1 by engaging the torque terminal opening 11 with the torque terminal 3. Afterwards, tin is injected into the terminal body 1, and the crimp-free terminal is quickly aligned with the bolts on the busbar using the quick-release slot 22. The nut is then tightened to complete the quick installation.

[0066] The technical solution provided by the embodiments of the present application has the following advantages:

[0067] 1. Due to the provision of the torque terminal 3 and the torque terminal opening 11, the cable can be fixed without the need for a hydraulic oil pump and crimping pliers;

[0068] 2. The waterproof rain skirt 4 effectively prevents rainwater from invading the wire core outdoors;

[0069] 3. Due to the provision of the first twist-off rod 33 and the second twist-off rod 34 of the torque terminal 3, it is possible to adapt to cable cores of different thicknesses;

[0070] 4. The quick-install slot 22 allows the bolts to be quickly fixed, shortening the installation time;

[0071] 5. Due to the provision of the round hole 212 and the long waist hole 211, it can match the contact network switch busbars with different spacings.

[0072] The above embodiments are provided for persons familiar with the art to implement or use the present application. Personnel familiar with the art may make various modifications or changes to the above embodiments without departing from the application concept of the present application. Therefore, the scope of protection of the present application is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A crimp-free terminal for rail transit cables, characterized in that: include: A terminal body, the terminal body comprising a torque terminal opening, a first end of the body, and a second end of the body, the torque terminal opening being a threaded hole; A torque terminal, the size of which matches the torque terminal opening, the torque terminal being twisted into the torque terminal opening, and the torque terminal fixing the cable; A busbar connection portion, the busbar connection portion being connected to the first end of the body, the busbar connection portion having a mounting hole, and the busbar wiring portion mounting the crimp-free terminal on the busbar through the mounting hole; A waterproof rain skirt is connected to the second end of the body, and the waterproof rain skirt prevents rainwater from intruding.

2. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The torque terminal comprises: Nut; a first stud, the first stud being provided at an end portion of the torque terminal; a first twist-off rod, the first twist-off rod being fixedly connected to the first stud; a second stud fixedly connected to the first twist-off rod; a second twist-off rod, one end of the second twist-off rod being fixedly connected to the nut, and the other end of the second twist-off rod being fixedly connected to the second stud; The first twist-off rod and the second twist-off rod are twisted off from the torque terminal according to the thickness of the cable.

3. The crimp-free terminal for rail transit cables according to claim 2, characterized in that: The nut, the first stud, the first twist-off rod, the second stud and the second twist-off rod are integrally formed.

4. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: At least two torque terminal openings are provided, and the axial angles thereof are 90° to each other.

5. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The mounting holes include long waist holes and round holes.

6. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The material of the terminal body is a sixth series aluminum alloy, and the material of the torque terminal is a seventh series aluminum alloy.

7. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The busbar connection part is a plate-shaped structure, and the thickness of the busbar connection part is not less than 10 mm.

8. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The terminal body is forged from aluminum alloy billet with a density of 2.8 g / cm3.

9. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The busbar connection portion further includes a quick-release slot, the width of the quick-release slot is 24 mm, and the depth of the quick-release slot is greater than 3 mm.

10. The crimp-free terminal for rail transit cables according to claim 1, characterized in that: The terminal body, busbar connection portion and waterproof rain skirt are integrally formed.

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