Modularized contact rail end elbow

Abstract

A modularized contact rail end elbow comprises a first elbow body, an insulation slide way and a second elbow body, the first elbow body is provided with a straight section and a first bending section, the second elbow body is provided with a second bending section and a third bending section, the insulation slide way is arranged between the first elbow body and the second elbow body and fixedly connected with the first bending section and the second bending section, and the insulation slide way is arranged between the first elbow body and the second elbow body. When the end elbow is on line and works, the first elbow body is electrified, the second elbow body is not electrified, the working faces of the first bending section, the insulating slide way and the second bending section are smoothly connected, the working faces of the first elbow body and the insulating slide way are smoothly connected through an end tab, and the end tab comprises a transition section and an arc striking section. The transition section is fixed on a concave platform at the end part of the first bending section; and the arc striking section is embedded in a groove at one end of the working surface of the insulating slideway. The current path of the transition slope section is physically cut off through the insulating slide way, and the insulating slide way is protected from being ablated by the run-on plate, so that the problem of ablation of the transition slope section is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of urban rail transit technology, and in particular to a modular contact rail end bend. Background Technology

[0002] The contact rail end elbow is a critical current-collecting component in the traction power supply system of urban rail transit. Its core function is to guide the current collector shoe to achieve a smooth transition between different contact rail sections. Its operating status directly affects the quality of train current collection and operational safety. Especially in complex areas such as turnaround lines, crossover lines, and storage lines, frequent track switching causes the end elbow to continuously endure high-frequency mechanical impacts and electrical cycles, resulting in significant ablation of its working surface, which has become a major factor affecting the durability of this component. Ablation mainly occurs in the transition slope section of the working surface, especially near the first suspension point support at the end of the end elbow. This area is affected by the pressure of the current collector shoe and offline electric arc, resulting in damage such as pitting, dents, and molten accumulation. Increased roughness further exacerbates arcing and material loss. To address these issues, it is urgent to improve the ablation resistance of the contact rail end elbow and optimize its maintenance convenience to ensure the efficient and stable operation of the traction power supply system. Summary of the Invention

[0003] This invention provides a modular contact rail end elbow to overcome the shortcomings of the prior art.

[0004] The technical solution adopted in this invention is: a modular contact rail end elbow, including a first elbow body, an insulating slide rail and a second elbow body, wherein the first elbow body has a straight section and a first bending section, and the second elbow body has a second bending section and a third bending section;

[0005] The insulating slide is set between the first elbow body and the second elbow body and is fixedly connected to the first bending section and the second bending section, so that when the end elbow is online and working, the first elbow body is energized and the second elbow body is de-energized, and the working surfaces of the first bending section, the insulating slide, and the second bending section are smoothly connected to each other.

[0006] The working surfaces of the first elbow body and the insulating slide are smoothly connected by an arc-guiding plate. The arc-guiding plate includes a transition section and an arc-guiding section. The transition section is fixed on the concave platform at the end of the first bending section, and the arc-guiding section is embedded in the groove at one end of the working surface of the insulating slide.

[0007] The working surface of the arc-initiating section includes a straight surface that connects with the transition section and a gradually downward sloping surface; the back of the arc-initiating section has a through groove along the width direction, and the end of the insulating slide that connects with the arc-initiating plate has a downward sloping surface, which is distributed on both sides of the straight surface.

[0008] The insulating slide is composed of two slide rails with the same structure and symmetrical arrangement. The two ends of the two slide rails are fixedly connected to the first bending section and the second bending section, respectively. The working surfaces of the two slide rails are symmetrically provided with recessed platforms forming the grooves.

[0009] Both the first elbow body and the second elbow body are made of I-shaped contact rails. The two ends of the rails are respectively provided with trapezoidal connecting parts. The trapezoidal connecting parts are respectively inserted into the cavities on both sides of the rail web of the corresponding first elbow body and second elbow body, and are fastened to the first elbow body and the second elbow body respectively by bolt pairs.

[0010] The groove is a wedge-shaped structure, and the arc segment is a wedge-shaped plate adapted to the wedge-shaped structure.

[0011] The transition section has threaded blind holes diagonally on its back side. The transition section is fixed on the recessed platform by screws passing through the first elbow body and the trapezoidal connecting part and being threadedly connected to the threaded blind holes.

[0012] The arc-starting plate is made of stainless steel.

[0013] The insulated slide is made of high-strength insulating material.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This invention completely electrically isolates the most severely eroded transition slope section (the second elbow body) by setting up an insulating slide, thereby cutting off the current path of the transition slope section from a physical structure perspective and fundamentally solving the erosion problem of the transition slope section.

[0016] 2. By setting up an arc-initiating plate, the present invention achieves the constraint and energy dissipation of the electric arc in the transition zone, preventing the electric arc from spreading towards the insulating slide and the first elbow body, thus protecting the insulating slide and the first elbow body from damage.

[0017] 3. Once the arc-guiding plate of this invention reaches the end of its service life, it can be replaced in situ without disassembling the elbow body and the insulating slide, which significantly reduces maintenance difficulty and operation time. Attached Figure Description

[0018] Figure 1 , 2 This is a schematic diagram of the structure of the present invention;

[0019] Figure 3 This is a partially enlarged schematic diagram of the present invention;

[0020] Figure 4 This is a cross-sectional view of the structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the first elbow body structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the second elbow body structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the insulating slide structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the arc-initiating plate structure of the present invention. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-8 The present invention will be described in detail below with reference to specific embodiments.

[0026] A modular contact rail end elbow includes a first elbow body 1, an insulating slide rail 2, and a second elbow body 3. The first elbow body 1 has a straight section 1-1 and a first bending section 1-2, and the second elbow body 3 has a second bending section 3-1 and a third bending section 3-2.

[0027] The insulating slide 2 is fixedly connected between the first elbow body 1 and the second elbow body 3, and to the first bending section 1-2 and the second bending section 3-1. When the end elbow is online and working, the first elbow body 1 is energized, while the second elbow body 3 is de-energized. The working surfaces of the first bending section 1-2, the insulating slide 2, and the second bending section 3-1 are smoothly connected to each other. By completely electrically isolating the second elbow body, the current path of the transition slope section is cut off from the physical structure. Even if the steep slope section has a small contact surface of the current collector shoe, the risk of electrical ablation is eliminated because there is no current path. This solves the technical problem of easy ablation and high maintenance frequency of steep slope sections in principle.

[0028] The working surfaces of the first elbow body 1 and the insulating slide 2 are smoothly connected by an arc-inducing plate 4. The arc-inducing plate 4 includes a transition section 4-1 and an arc-inducing section 4-2. The transition section 4-1 is fixed on the recess 1-3 at the end of the first bending section 1-2, and the arc-inducing section 4-2 is embedded in the groove 2-1 at one end of the working surface of the insulating slide 2. When the current collector shoe slides through the "energized-de-energized" transition area, the guiding arc constraint acts on the arc-inducing plate, preventing the arc caused by the potential change from burning the first end elbow body and the insulating slide. This arc-inducing plate is a replaceable structure, and subsequent maintenance only requires replacing the arc-inducing plate.

[0029] To improve the arc-initiating effect, the specific arc-guiding measures are as follows: the working surface of the arc-initiating section 4-2 includes a straight surface 4-2-1 that connects with the transition section 4-1 and a gradually downward sloping surface 4-2-2; the back of the arc-initiating section 4-2 has through grooves 4-2-3 evenly distributed along the width direction; the end of the insulating slide 2 that connects with the arc-initiating plate 4 has a downward sloping surface 2-2, and the sloping surface 2-2 is distributed on both sides of the straight surface 4-2-1.

[0030] On the one hand, the downward slope 4-2-2, in conjunction with the through groove 4-2-3, forms a double constraint and energy dissipation path for the electric arc, preventing the arc from spreading towards the insulating slide 2 and the first elbow body, thus protecting the insulating slide and the first elbow body from damage. The first constraint is achieved by the downward slope, which constrains the arc generation range through its sloping physical shape, while lengthening the arc path to achieve arc cooling and reduce arc energy density. The second constraint is achieved by the through groove, which divides and blocks the arc spreading along the surface of the arc-starting plate within each through groove, further dissipating arc energy and preventing the arc from spreading to the periphery. Through this dual constraint structure, the arc energy is forced to concentrate on the arc-starting plate itself.

[0031] When the current collector shoe slides from the de-energized area to the energized area, the inclined surface 2-2 forms a staggered step structure at the transition between the insulating slide and the arc-starting plate 4, so that the sliding surface of the current collector shoe first makes stable contact with the straight surface 4-2-1 of the arc-starting section 4-2, thereby avoiding contact with the end of the insulating slide 2. At the moment when the current collector shoe first contacts the energized area, the electric arc generated by the potential change first acts on the contact interface between the current collector shoe and the arc-starting plate, concentrating the arc energy on the surface of the arc-starting plate, thereby transferring the arc ablation to the arc-starting plate and protecting the insulating slide from ablation.

[0032] When the arc-starting plate is eroded due to long-term exposure to electric arcs, simply replacing the arc-starting plate in situ will restore the normal operation of the equipment, without the need to disassemble and replace the first elbow body and the insulating slide.

[0033] In one embodiment, the insulating slide 2 is composed of two slide rails with the same structure and symmetrical arrangement. The two ends of the two slide rails are fixedly connected to the first bending section 1-2 and the second bending section 3-1, respectively. The working surfaces of the two slide rails are symmetrically provided with recessed platforms forming the groove 2-1.

[0034] In one embodiment, both the first elbow body 1 and the second elbow body 3 are made of I-shaped contact rails. The two ends of the rails are respectively provided with trapezoidal connecting parts 2-3. The trapezoidal connecting parts 2-3 are respectively inserted into the cavities on both sides of the rail web of the corresponding first elbow body 1 and second elbow body 3, and the trapezoidal connecting parts are fastened to the first elbow body 1 and the second elbow body 3 respectively by bolt pairs 5.

[0035] Preferably, the groove 2-1 is a wedge-shaped structure, and the arc segment 4-2 is a wedge plate adapted to the wedge-shaped structure.

[0036] To facilitate the replacement of the arc-starting plate, the transition section 4-1 is provided with a threaded blind hole 4-1-1 on the back diagonally. The transition section 4-1 is fixed on the recess 1-3 by screw 6 passing through the first elbow body 1 and the trapezoidal connecting part 2-3 and threadedly connecting to the threaded blind hole 4-1-1.

[0037] When replacing the arc-starting plate, simply loosen screw 6 to separate the arc-starting plate. After replacing it with a brand new arc-starting plate, realign screw 6 with the threaded blind hole 4-1-1 and tighten it to ensure reliable electrical conduction and mechanical fixation. This completes the replacement and repair process. The entire maintenance process is efficient and convenient, effectively shortening maintenance time.

[0038] Preferably, the arc-inducing plate 3 is made of stainless steel. The insulating slide 2 is made of high-strength insulating material, such as glass fiber reinforced plastic.

[0039] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent variations made to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A modular contact rail end elbow, characterized in that: It includes a first elbow body (1), an insulating slide (2) and a second elbow body (3). The first elbow body (1) has a straight section (1-1) and a first bending section (1-2), and the second elbow body (3) has a second bending section (3-1) and a third bending section (3-2). The insulating slide (2) is set between the first elbow body (1) and the second elbow body (3) and is fixedly connected to the first bending section (1-2) and the second bending section (3-1), so that when the end elbow is online and working, the first elbow body (1) is energized and the second elbow body (3) is de-energized, and the working surfaces of the first bending section (1-2), the insulating slide (2), and the second bending section (3-1) are smoothly connected to each other; The working surfaces of the first elbow body (1) and the insulating slide (2) are smoothly connected by an arc-guiding plate (4). The arc-guiding plate (4) includes a transition section (4-1) and an arc-guiding section (4-2). The transition section (4-1) is fixed on the recess (1-3) at the end of the first bending section (1-2), and the arc-guiding section (4-2) is embedded in the groove (2-1) at one end of the working surface of the insulating slide (2).

2. The end elbow according to claim 1, characterized in that: The working surface of the arc-leading section (4-2) includes a straight surface (4-2-1) that connects with the transition section (4-1) and a gradually downward sloping surface (4-2-2); the back of the arc-leading section (4-2) is provided with a through groove (4-2-3) along the width direction; the end of the insulating slide (2) that connects with the arc-leading plate (4) is provided with a downward sloping surface (2-2), and the sloping surface (2-2) is distributed on both sides of the straight surface (4-2-1).

3. The end elbow according to claim 2, characterized in that: The insulating slide (2) consists of two slide rails with the same structure and symmetrical arrangement. The two ends of the two slide rails are fixedly connected to the first bending section (1-2) and the second bending section (3-1) respectively. The working surfaces of the two slide rails are symmetrically provided with recessed platforms forming the groove (2-1) at one end.

4. The end elbow according to claim 3, characterized in that: Both the first elbow body (1) and the second elbow body (3) are made of I-shaped contact rails. The two ends of the rails are respectively provided with trapezoidal connecting parts (2-3). The trapezoidal connecting parts (2-3) are respectively inserted into the cavities on both sides of the rail web of the corresponding first elbow body (1) and second elbow body (3), and the trapezoidal connecting parts are fastened to the first elbow body (1) and the second elbow body (3) respectively by bolt pairs (5).

5. The end elbow according to claim 1, 2, or 3, characterized in that: The groove (2-1) is a wedge-shaped structure, and the arc segment (4-2) is a wedge plate adapted to the wedge-shaped structure.

6. The end elbow according to claim 1 or 2, characterized in that: The transition section (4-1) has a threaded blind hole (4-1-1) on the back side. The transition section (4-1) is fixed on the recess (1-3) by threading the screw (6) through the first elbow body (1) and the trapezoidal connecting part (2-3) and threading it into the threaded blind hole (4-1-1).

7. The end elbow according to claim 1, characterized in that: The arc-starting plate (3) is made of stainless steel plate.

8. The end elbow according to claim 1, characterized in that: The insulated slide (2) is made of high-strength insulating material.

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