Grounding device for crane jib

Abstract

The utility model relates to a grounding device for a crane jib. The grounding device comprises a base, a carbon brush arranged in the base, a fixing sheet and a spring coil, the bottom of the fixing sheet is provided with a spring coil used for pushing the carbon brush to enable the carbon brush to be tightly attached to a crane two-section arm guide rail; the base comprises a fixed bottom plate, a carbon brush connecting part and a carbon brush sliding positioning part; a convex groove composed of two square grooves is formed in the carbon brush sliding positioning part, and the two square grooves are a carbon brush sliding through groove used for sliding of the carbon brush and stretching of the spring coil and a fixing piece clamping groove used for limiting the fixing piece; the upper end face of the carbon brush is an inclined face matched with the spring coil. The device is simple in structure and convenient to manufacture, when the two-section arm of the crane stretches out and draws back, the spring coil always pushes the carbon brush to downwards cling to the two-section arm guide rail along the carbon brush sliding positioning part, continuous conduction between a basic arm of a vehicle body and the two-section arm guide rail is ensured, self-adaption to stretching out and drawing back and shaking of the suspension arm can be achieved, vibration is buffered, and continuous grounding is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery, and specifically relates to a grounding device for a crane boom. Background Technology

[0002] Currently, railway crane boom grounding devices typically employ the following methods: fixed conductor connection type, which directly connects the main boom and the second boom section via conductors; however, these conductors are prone to breakage due to tension during extension and retraction; slip ring or sliding contact structure, which relies on sliding contact for conduction; however, prolonged shaking can cause wear on the contact surface, leading to poor grounding and safety accidents; and rigid conductive bracket type, which cannot adapt to dynamic shaking and is prone to gaps due to vibration, resulting in grounding failure. In view of the above-mentioned problems with existing grounding device technologies, this utility model is proposed. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a grounding device for an adaptive telescopic crane boom.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a grounding device for a crane boom, comprising a base, a carbon brush, a fixing plate, and a spring coil disposed within the base; the carbon brush is connected to the base via a wire; the upper part of the fixing plate is directly or indirectly connected to the base, and a spring coil for pushing the carbon brush to make the carbon brush tightly adhere to the guide rail of the crane boom is tangentially installed at the bottom of the fixing plate; the base includes a central fixed base plate, a carbon brush connecting part located at the upper part of the fixed base plate, and a carbon brush sliding positioning part located at the lower part of the fixed base plate; the carbon brush connecting part and the carbon brush sliding positioning part are internally connected; the carbon brush sliding positioning part is provided with a convex groove composed of two square grooves, the two square grooves being a carbon brush sliding through groove for carbon brush sliding and spring coil extension and retraction, and a fixing plate retaining groove for limiting the fixing plate; the internal dimensions of the carbon brush sliding through groove are adapted to the outer contour of the carbon brush; the upper end face of the carbon brush is an inclined surface that cooperates with the spring coil.

[0005] An end cap is installed on the top of the base; the top of the fixing piece is connected to the end cap.

[0006] The upper part of the fixing plate is bent, and the bent part is installed at the center of the inner side of the end cap; the fixing plate and the spring coil are integrated.

[0007] The carbon brush connector has a hollow cylindrical structure; the carbon brush connector is symmetrically provided with two end cap mounting holes for fixing the end cap with fixing screws.

[0008] The fixed base plate is rhomboid in shape, and the two ends of the long diagonal of the rhomboid are provided with base mounting holes for connecting the base to the crane's main arm.

[0009] The conductor is a copper stranded wire, with the lower end embedded inside the carbon brush and the upper end connected to the base.

[0010] The inner wall of the carbon brush connector is provided with a boss for connecting copper stranded wires; the boss is provided with a carbon brush connection mounting hole.

[0011] The upper end of the copper stranded wire is connected to the base via an open copper lug.

[0012] The open-ended copper lug and the copper stranded wire are welded together by ultrasonic welding.

[0013] The open-ended copper lug is pressed into the carbon brush connection mounting hole by a grounding screw.

[0014] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: Compared with the prior art, the adaptive telescopic crane boom dynamic grounding device provided by this utility model effectively solves the safety problems such as poor grounding caused by boom swaying during crane boom telescopic movement. When the second boom of the crane telescopically extends or retracts, the spring coil always pushes the carbon brush downward along the carbon brush sliding positioning part to keep it in close contact with the second boom guide rail, maintaining contact pressure. Moreover, it has good conductivity and corrosion resistance. It forms an electrical path through the car body and the rail, greatly improving the safety and reliability of the entire vehicle system's electrical return current and ensuring the safety of the vehicle's onboard electrical return. The device ensures the safety of equipment and personnel on board, meeting the overall safe operation requirements of the vehicle. Its simple structure and ease of manufacture, along with the spring-driven adaptive grounding system that synchronizes with the extension and retraction of the second-section boom, utilize a spring compensation mechanism to counteract swaying and ensure continuous conductivity between the main boom and the second-section boom guide rails. It adapts to the boom's extension, retraction, and swaying while buffering vibrations, ensuring continuous grounding. This reduces carbon brush friction loss and maintenance; it is durable and saves production costs. It is particularly suitable for dynamic grounding technology in multi-section telescopic boom structures, such as fire ladders and aerial work platforms, solving similar dynamic grounding challenges. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this utility model, the accompanying drawings used in the embodiments of this utility model will be briefly described below. Obviously, the accompanying drawings described below are only some embodiments of this utility model and do not constitute an improper limitation of this utility model.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is the front view of the present invention.

[0018] Figure 3 for Figure 2 AA sectional view.

[0019] Figure 4 for Figure 3CC section view.

[0020] Figure 5 This is a schematic diagram of the base structure.

[0021] The above-mentioned drawings include the following reference numerals: 1. End cap; 2. End cap fixing screw; 3. Grounding device fixing screw; 4. Fixing base plate; 5. Base; 6. Carbon brush; 7. Copper stranded wire; 8. Open wiring copper lug; 9. Grounding screw; 10. Spring coil; 11. Fixing plate; 12. Base mounting hole; 13. End cap mounting hole; 14. Carbon brush sliding groove; 15. Fixing plate slot; 16. Carbon brush sliding positioning part; 17. Carbon brush connecting part; 18. Carbon brush connecting mounting hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. The described embodiments are only some embodiments of the present utility model, not all embodiments, and do not limit the technical solutions of the present utility model thereto. All equivalent changes in structural principles and shape modifications made in accordance with the spirit of the present utility model, and all other embodiments obtained by those skilled in the art without creative labor, should fall within the protection scope of the present utility model.

[0023] Please see Figures 1-5 The adaptive telescopic crane boom dynamic grounding device provided by this utility model includes an end cover 1, a base 5, copper stranded wire 7, carbon brush 6, a fixing plate 11, and a spring coil 10. The spring coil 10 is tangentially installed at the bottom of the fixing plate 11, and the top of the fixing plate 11 is connected to the end cover 1. The end cover 1 is installed on the top of the base 5. The upper part of the fixing plate 11 is bent, and the bent part is installed at the center of the inner side of the end cover 1. The spring coil 10 is tangentially installed at the bottom of the fixing plate 11. The fixing plate 11 and the spring coil 10 are integral.

[0024] The copper stranded wire 7 is embedded inside the carbon brush 6 and connected to the base 5 via an open-ended copper lug 8. The open-ended copper lug 8 and the copper stranded wire 7 are welded together using ultrasonic welding. The carbon brush and the base are connected by pure copper bare stranded wire. The copper stranded wire has good conductivity, which makes the grounding device have good conductivity, making the vehicle body safer and more reliable during use.

[0025] The fixed base plate 4 divides the base 5 into upper and lower parts, namely the carbon brush connection part 17 and the carbon brush sliding positioning part 16. The carbon brush connection part 17 is a hollow cylinder, and the carbon brush sliding positioning part 16 is a hollow convex body. The carbon brush connection part 17 and the carbon brush sliding positioning part 16 are connected internally.

[0026] The carbon brush connector 17 has two symmetrical mounting holes 13. The end cap 1 is installed in the mounting hole 13 on the top end face of the base 5 by the end cap fixing screw 2. The inner wall of the carbon brush connector 17 has a carbon brush connection mounting hole 18 on one side, which is crimped to the open wiring copper lug 8 by the grounding screw 9.

[0027] The carbon brush sliding positioning part 16 is a convex groove, divided into two rectangular positioning grooves. One is a carbon brush sliding through groove 14 for the extension and retraction of the spring coil 10 and the sliding of the carbon brush 6. The other is a fixing plate slot 15 to limit the fixing plate 11. The bottom of the fixing plate slot 15 is provided with a limiting base plate 151.

[0028] The design of the carbon brush sliding positioning part, the fixing plate, and the spring coil ensures that the fixing plate remains stationary during the extension and retraction of the crane boom, while the spring coil extends and retracts synchronously with the extension and retraction of the second boom section. The carbon brush slides smoothly within the carbon brush sliding positioning groove, ensuring that the carbon brush is always in contact with the crane second boom guide rail. This maintains electrical conductivity between the crane body's main boom and the second boom section during operation, ensuring equal potential between the crane body and the ground under all conditions.

[0029] The fixed base plate 4 is rhomboid in shape, and symmetrically located at its center are base mounting holes 12 for connecting the base 5 to the crane's main boom in conjunction with the grounding device fixing screws 3. The rhomboid structure of the fixed base plate increases the contact area between its bottom surface and the crane's main boom. The base mounting holes 12 ensure a tighter fit between the fixed base plate and the main boom, resulting in a secure and reliable connection between the grounding device and the main boom during the extension and retraction of the two-section boom and the rotation of the boom.

[0030] This device effectively connects the crane's main boom and the second boom guide rails, and effectively connects the crane body to the rails, forming an electrical path. This reduces the potential of the crane body and maintains equipotential between the crane body and the rails under any circumstances, providing a safe and reliable common reference ground for the onboard equipment. Furthermore, its excellent conductivity and corrosion resistance significantly improve operational safety, ensuring the safety of the onboard equipment and personnel.

Claims

1. A grounding device for a crane boom, characterized in that, The system includes a base (5), a carbon brush (6) disposed within the base (5), a fixing plate (11), and a spring coil (10); the carbon brush (6) is connected to the base (5) via a wire; the upper part of the fixing plate (11) is directly or indirectly connected to the base (5), and a spring coil (10) for pushing the carbon brush (6) so that the carbon brush (6) is tightly attached to the guide rail of the second boom of the crane is installed tangentially at the bottom of the fixing plate (11); the base (5) includes a central fixed base plate (4), a carbon brush connecting part (17) located on the upper part of the fixed base plate (4), and a carbon brush located on the lower part of the fixed base plate (4). The sliding positioning part (16) is connected to the carbon brush connecting part (17) inside the carbon brush sliding positioning part (16); the carbon brush sliding positioning part (16) is provided with a convex groove composed of two square grooves, the two square grooves being a carbon brush sliding through groove (14) for sliding the carbon brush (6) and extending and retracting the spring coil (10), and a fixing plate slot (15) for limiting the fixing plate (11); the internal dimensions of the carbon brush sliding through groove (14) are adapted to the outer contour of the carbon brush (6); the upper end face of the carbon brush (6) is an inclined surface that cooperates with the spring coil (10).

2. The grounding device for a crane boom according to claim 1, characterized in that, The base (5) is fitted with an end cap (1) on top; the top of the fixing piece (11) is connected to the end cap (1).

3. The grounding device for a crane boom according to claim 1, characterized in that, The upper part of the fixing piece (11) is bent, and the bent part is installed at the center of the inner side of the end cover (1); the fixing piece (11) and the spring coil (10) are integrated.

4. The grounding device for a crane boom according to claim 1, characterized in that, The carbon brush connection part (17) has a hollow cylindrical structure; the carbon brush connection part (17) is symmetrically provided with two end cap mounting holes (13) for cooperating with the fixing screw (2) to fix the end cap.

5. The grounding device for a crane boom according to claim 1, characterized in that, The fixed base plate (4) is rhomboid in shape, and the two ends of the long diagonal of the rhomboid are provided with base mounting holes (12) for connecting the base (5) to the basic arm of the crane.

6. The grounding device for a crane boom according to claim 1, characterized in that, The conductor is a copper stranded wire (7), the lower end of which is embedded inside the carbon brush (6), and the upper end is connected to the base (5).

7. The grounding device for a crane boom according to claim 6, characterized in that, The inner wall of the carbon brush connector (17) is provided with a boss for connecting copper stranded wire (7); the boss is provided with a carbon brush connection mounting hole (18).

8. The grounding device for a crane boom according to claim 7, characterized in that, The upper end of the copper stranded wire (7) is connected to the base (5) via an open-ended copper lug (8).

9. The grounding device for a crane boom according to claim 8, characterized in that, The open-ended copper lug (8) and the copper stranded wire (7) are welded together by ultrasonic welding.

10. The grounding device for a crane boom according to claim 8, characterized in that, The open wiring copper lug (8) is pressed into the carbon brush connection mounting hole (18) by the grounding screw (9).

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