Conductive plastic and metal integrated clamping device for supporting contact rail

Abstract

The utility model discloses a conductive plastic and metal integrated clamping device for supporting a contact rail. The conductive plastic and metal integrated clamping device comprises a metal clamping body, an insulating support and a conductive plastic pad coated on the metal clamping body, the metal clamping body comprises a first end face, a second end face, a bottom face, a first side front end face and a second side front end face. A bolt through hole is formed in the first end face; conical column grooves are distributed in the second end face, the first side front end face, the second side front end face and the bottom face, and a dovetail boss is arranged on the bottom face. A dovetail clamping groove clamped into the dovetail boss is formed in the insulating support; the conductive plastic pad comprises a first limiting surface, a second limiting surface and a supporting surface which are in contact with the contact rail, a conical columnar convex nail positioned in the conical columnar groove, and a hole matched with the dovetail boss; and the first limiting surface and the supporting surface are arc-shaped surfaces extending to the direction of the contact rail. The utility model solves the technical problems that the plastic pad is easy to separate, the sliding clamping stagnation is caused, and the bearing load is small in the using process of the existing fixed clamping jaw.

Description

Technical Field

[0001] The utility model relates to a contact rail in the technical field of urban rail traction power supply, in particular to a conductive plastic and metal integrated clamping device for supporting the contact rail. Background Art

[0002] In lateral contact rail power supply systems, I-shaped contact rails are commonly used as the conductive transmission medium. These I-shaped contact rails are laid along the line. To insulate and position the contact rails, integral insulating brackets and corresponding accessories are required. To prevent the I-shaped contact rails from swinging side to side and to allow them to expand and contract freely along the line due to thermal expansion and contraction, a locking device is installed on the insulating brackets to limit and support the contact rails.

[0003] In actual use, the traditional snap-fit ​​body is made of metal material, and the matching plastic pad is bonded or non-integrated injection molding. Debonding may occur in the case of bonding. When the traditional non-integrated injection molding process is used, due to the different thermal expansion coefficients of the materials, separation may occur at the connection between the snap-fit ​​body and the injection molding material due to thermal expansion and contraction, affecting the overall appearance and size while creating the risk of injection molding material peeling, which in turn affects the safety performance of the product.

[0004] At the same time, the traditional composite device of the snap-fit ​​body and the plastic pad is fixed to the insulating support only by bolts. When the composite device of the snap-fit ​​body and the plastic pad is subjected to alternating loads, it may occasionally fail and break. Or when the nearby supporting device fails, the composite device of the snap-fit ​​body and the plastic pad seriously exceeds the maximum load force and the bolts fail and break. At this time, the composite device of the snap-fit ​​body and the plastic pad will directly separate from the insulating support due to the lack of other safeguards.

[0005] Therefore, there is an urgent need to provide a device that can improve the sliding smoothness of the contact rail after it is fixed and avoid separation between the engaging body and the plastic, while being able to withstand large loads. Utility Model Content

[0006] Purpose of the utility model: In view of the technical deficiencies of the I-shaped contact rail clamping device on the insulating support device in the existing side contact rail power supply system, the utility model provides a conductive plastic and metal integrated clamping device for supporting the contact rail, which solves the technical problems of the existing clamping device during use, such as the easy separation of the plastic pad, sliding jamming, and low load bearing capacity.

[0007] Technical solution: The conductive plastic and metal integrated clamping device for supporting the contact rail of the utility model comprises a metal clamping body, an insulating support and a conductive plastic pad coated on the metal clamping body;

[0008] The metal clamping body includes a first end face, a second end face, a bottom face, a first side front end face and a second side front end face; a bolt through hole is provided on the first end face;

[0009] Conical column grooves are distributed in the second end surface, the front end surface of the first side, the front end surface of the second side and the bottom surface, and a dovetail boss is provided on the bottom surface; an inlay groove coated with a conductive plastic pad is opened on the front end surface of the first side and the front end surface of the second side;

[0010] A dovetail slot for snapping into the dovetail boss is provided in the insulating support;

[0011] The conductive plastic pad includes a first limiting surface, a second limiting surface and a supporting surface that contact the contact rail, a conical columnar protrusion located in the conical column groove of the metal clamping body, and a hole that cooperates with the dovetail boss on the metal clamping body; the first limiting surface and the supporting surface are arc-shaped surfaces extending in the direction of the contact rail.

[0012] A circular groove is formed on the first end surface of the metal clamping body.

[0013] A bolt through hole is provided at the center of the circular groove, and a bolt with a washer passes through the bolt through hole.

[0014] Both sides of the conductive plastic pad are flush with the first side front end surface and the second side front end surface of the metal clamping body.

[0015] The hole in the conductive plastic pad that matches the dovetail boss on the bottom surface of the metal clamping body is a square hole.

[0016] The metal clamping body is an aluminum alloy body.

[0017] The conductive plastic pad is a conductive nylon plastic pad.

[0018] The conductive plastic pad is injection-molded and coated on the metal clamping body, and the electric energy is conducted to the metal clamping body and the insulating support through the conductive plastic pad to form an equal potential, thereby avoiding gap discharge caused by the potential difference between the components.

[0019] The conical column groove of the metal clamping body and the conical columnar protrusion of the conductive plastic pad are combined to form a wedge surface.

[0020] There is a sliding gap between the first limiting surface, the second limiting surface and the contact rail.

[0021] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0022] (1) Compared with the traditional locking device, the present invention adopts a conductive plastic material, which reduces the friction coefficient of the contact surface with the contact rail and makes the contact rail smoother during sliding.

[0023] (2) The present invention adopts conductive plastic material to eliminate the potential difference between the metal engaging body and the insulating support when the contact rail is energized, and avoids the generation of gap discharge.

[0024] (3) In the present invention, a wedge-shaped inclined surface is formed by combining the grooves of several conical columns on the metal clamping body with the conical columnar protrusions formed after the conductive plastic pad is injected. This combination of wedge-shaped inclined surfaces avoids the separation phenomenon at the connection between the metal clamping body and the conductive plastic pad during thermal expansion and contraction, thereby improving the safety performance of the present invention when in use.

[0025] (4) In the present invention, the limiting surface and the supporting surface in contact with the I-shaped contact rail are both arc-shaped surfaces, which reduces the friction with the I-shaped contact rail and adapts to the large slope changes of the contact rail along the line direction and the vertical road direction, thereby improving the sliding smoothness and line adaptability of the contact rail after it is fixed.

[0026] (5) In the present invention, the bottom of the metal snap-fit ​​body is combined with a dovetail guide rail and a dovetail slot on the insulating support. This dovetail structure shares the load borne by the fixing bolts in the horizontal and vertical directions perpendicular to the line direction. At the same time, it remains fixed even after the connecting bolts fail, thereby improving the connection reliability and safety between the metal snap-fit ​​body, the conductive plastic pad and the insulating support. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a general structural diagram of the conductive plastic and metal integrated clamping device for supporting the contact rail of the utility model;

[0028] Figure 2 It is an isometric view of the metal clamping body of the present invention;

[0029] Figure 3 It is a front view of the metal clamping body of the present utility model;

[0030] Figure 4 It is a cross-sectional view of the metal clamping body of the present utility model;

[0031] Figure 5 This is an isometric structural diagram of the conductive plastic pad of the utility model;

[0032] Figure 6 This is a front view of the conductive plastic pad of the utility model;

[0033] Figure 7 It is the structural assembly drawing of the utility model;

[0034] Figure 8 This is a schematic diagram of the coordination of the slope angle when the contact rail is installed along the line direction of the present invention. DETAILED DESCRIPTION

[0035] The conductive plastic and metal integrated clamping device for supporting the contact rail of the utility model is used to support the I-shaped contact rail in the side contact rail power supply system. Figures 1 to 8 As shown, the conductive plastic and metal integrated clamping device for supporting a contact rail of the present invention comprises a metal clamping body 1 , a conductive plastic pad 2 and an insulating support 3 .

[0036] The metal snap-fit ​​body 1 includes a first end face 1c, a second end face 1d, a bottom face 1e, a first side front face 1a, and a second side front face 1b. A circular groove 11 is defined on the first end face 1c, with a bolt hole 14 located in its center. A flat washer or lock washer is located within this circular groove 11. Several tapered columnar grooves 12 are distributed across the second end face 1d, the first side front face 1a, the second side front face 1b, and the bottom face 1e. A dovetail boss 13 is located on the bottom face 1e.

[0037] In this embodiment, the metal clamping body 1 is made of aluminum alloy. The conductive plastic pad 2 is made of conductive nylon and is applied to the surface of the metal clamping body 1 by injection molding. After injection molding, the conductive plastic pad 2 includes a first limiting surface 22, a second limiting surface 25, and a support surface 23 that contact the contact rail 4; a tapered cylindrical stud 21 that connects to the conical column groove within the metal block clamping body 1; and a square hole 24 that mates with the dovetail boss 13 on the metal block claw body.

[0038] The metal snap-fit ​​body 1 defines several tapered columnar grooves 12 at the junction with the conductive plastic pad 2. The conductive plastic pad 2 is injection-molded to fill these grooves, forming tapered columnar protrusions 21, thus forming a wedge-shaped, inclined surface. The conductive nylon and aluminum alloy materials have the same thermal expansion coefficient, ensuring synchronized expansion and contraction during the injection molding process. The tapered columnar structure, through the limiting action of the wedge-shaped surfaces, prevents the two materials from separating, forming a composite, integrated structure.

[0039] A sliding gap is reserved between the first limiting surface 22, the second limiting surface 25 and the contact rail 4. The first limiting surface 22 and the supporting surface 23 are arcuate surfaces extending toward the contact rail, which reduces friction with the I-shaped contact rail and improves the sliding smoothness of the contact rail.

[0040] like Figure 8 As shown, the arcuate surface of the support surface 23 also ensures that the contact rail 4 can fit and support the contact rail 4 even when there is a large slope along the line direction.

[0041] like Figures 3-5As shown, the metal snap body 1 has recesses for enclosing the conductive plastic layer on its first and second front faces 1a, 1b. After the conductive plastic layer is applied to the metal snap body, i.e., during injection molding, the two sides of the conductive plastic pad 2 are flush with the first and second front faces 1a, 1b of the metal snap body 1. A dovetail boss 13 is provided on the bottom face 1e of the metal snap body 1. After injection molding, the conductive plastic pad 2 is filled with a hole at the base of the dovetail boss 13, forming a square hole 24 in this embodiment.

[0042] The dovetail boss 13 on the bottom surface 1e of the metal-engaging body 1 tightly mates with the dovetail slot 31 on the insulating support 3, positioning and limiting the conductive plastic and metal-engaging composite device horizontally and vertically perpendicular to the circuit direction. This also shares the load-bearing capacity of the fixing bolts, thereby enhancing the overall load-bearing capacity of the conductive plastic and metal-engaging composite device. Furthermore, even if the connecting bolts fail, the conductive plastic and metal-engaging composite device and the insulating support are still reliably connected.

[0043] In actual use, the conductive plastic and metal composite assembly of the present invention is inserted into the dovetail groove 31 of the insulating support 3 via the dovetail boss 13 to secure it in place. The bolt through-hole 14 is then aligned with the threaded hole on the insulating support 3. The connecting bolt 5 is fitted with a washer 6 and screwed into the threaded hole. The required torque is applied, and the assembly is then snapped into the contact rail 4 to complete the installation. When the contact rail 4 is energized, it becomes charged and conducts electrical energy to the metal coupling body 1 and the insulating support 3 via the conductive plastic pad 2, creating an equal potential. This prevents gap discharge caused by potential differences between the components.

Claims

1. A conductive plastic and metal integrated clamping device for supporting a contact rail, characterized by: It comprises a metal snap-fit ​​body (1), an insulating support (3), and a conductive plastic pad (2) coated on the metal snap-fit ​​body (1); The metal clamping body (1) comprises a first end face (1c), a second end face (1d), a bottom face (1e), a first side front face (1a) and a second side front face (1b); a bolt through hole (14) is provided on the first end face (1c); conical column grooves (12) are distributed in the second end face (1d), the first side front face (1a), the second side front face (1b) and the bottom face (1e); a dovetail boss (13) is provided on the bottom face (1e); an inlay groove for covering a conductive plastic pad (2) is provided on the first side front face (1a) and the second side front face (1b); The insulating support (3) is provided with a dovetail slot (31) for snapping into the dovetail boss (13); The conductive plastic pad (2) comprises a first limiting surface (22), a second limiting surface (25) and a supporting surface (23) in contact with the contact rail (4), a conical columnar protrusion (21) located in the conical column groove (12) of the metal clamping body (1), and a hole that cooperates with the dovetail boss (13) on the metal clamping body (1); the first limiting surface (22) and the supporting surface (23) are arc-shaped surfaces extending in the direction of the contact rail.

2. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: A circular groove (11) is provided on the first end surface (1c) of the metal clamping body (1).

3. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 2, characterized in that: A bolt through hole (14) is provided at the center of the circular groove (11).

4. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: Both sides of the conductive plastic pad (2) are flush with the first side front end surface (1a) and the second side front end surface (1b) of the metal clamping body (1).

5. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: The hole in the conductive plastic pad (2) that matches the dovetail boss (13) on the bottom surface (1e) of the metal snap-fit ​​body (1) is a square hole (24).

6. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: The metal engaging body (1) is an aluminum alloy body.

7. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: The conductive plastic pad (2) is a conductive nylon plastic pad.

8. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: The conductive plastic pad (2) is injection-molded and coated on the metal clamping body (1).

9. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: The conical column groove (12) of the metal clamping body (1) is combined with the conical columnar protrusion (21) injected with the conductive plastic pad to form a wedge surface.

10. The conductive plastic and metal integrated clamping device for supporting a contact rail according to claim 1, characterized in that: There is a sliding gap between the first limiting surface (22), the second limiting surface (25) and the contact rail (4).

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