A new self-locking distractor

Abstract

The utility model discloses a novel self -locking type tractor, including outer tube and inner tube, the end of inner tube is fixedly connected with the connecting mouth, the one end fixedly connected with hemispherical shell is approached to the connecting mouth, the inside of hemispherical shell is provided with the connecting cavity, the one end away from hemispherical shell of connecting mouth is equipped with ball head socket and connecting block slip mouth, the one end fixedly connected with the interface board is away from the connecting mouth of hemispherical shell. The utility model discloses reasonable in structure, through the collaborative design of spring, connecting block, hemispherical shell, when pulling ball inserts, can automatically push connecting block sliding and compress spring, after completely entering connecting cavity, spring resets, and connecting block is accurately clamped into gap, and the close surface is closely combined with pulling ball, and the contact pressure is increased to slope 2, realizes all -round locking, even under heavy load, jolt working condition also can not be loose, and the elastic coefficient of spring is accurately matched, and it is ensured that locking force is moderate, satisfies the demand of traction, and also avoids excessive locking and leads to unlocking difficulty.

Description

Technical Field

[0001] This utility model relates to the field of traction equipment technology, and in particular to a novel self-locking traction device. Background Technology

[0002] In vehicle towing operations, the towing device is the core component connecting the towing vehicle and the towed vehicle. Its connection stability and ease of operation directly affect the safety and efficiency of the towing operation. Existing towing devices have many shortcomings: some towing devices lack a reliable self-locking structure, making them prone to loosening after connection and posing safety hazards; some towing devices with locking functions are complex to operate, requiring additional tools to complete connection and unlocking; at the same time, the connection length adjustment method of traditional towing devices is cumbersome, making it difficult to adapt to different towing distance requirements, and the structural design of the locking part is unreasonable, resulting in insufficient locking strength, which cannot meet the requirements of high-intensity towing operations.

[0003] In view of the shortcomings of the prior art, this utility model proposes a new type of self-locking traction device, which aims to solve the problems of unreliable self-locking, complicated operation, inconvenient length adjustment and insufficient locking strength of the existing traction device. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a novel self-locking traction device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A novel self-locking traction device includes an outer tube and an inner tube. A connection port is fixedly connected to the end of the inner tube. A hemispherical shell is fixedly connected to the end of the connection port near the inner tube. A connection cavity is provided inside the hemispherical shell. A ball-head insertion port and a connecting block sliding port are provided at the end of the connection port away from the hemispherical shell. A connecting plate is fixedly connected to the end of the hemispherical shell away from the connection port. The connecting plate is fixedly connected to the inner wall of the inner tube. A connecting cover is fixedly connected to the side wall of the inner tube. A fixed rail is fixedly connected inside the connecting cover. A connecting block is slidably connected within the fixed rail. The connecting block is slidably connected within a connecting block slider. A notch that mates with the connecting block is provided at the end of the hemispherical shell near the connecting block. An arc surface is provided at the end of the connecting block near the notch. A first fixing block and a second fixing block are fixedly connected to the inner wall of the connecting cover. The first and second fixing blocks are slidably and rotatably connected to a shaft. The end of the shaft is rotatably connected to the connecting block. The end of the connecting block and the second fixing block are elastically connected by a spring, which is sleeved on the shaft.

[0006] Preferably, the inner tube has two sets of symmetrically arranged positioning holes on its side wall, each set having multiple positioning holes at equal intervals, and the outer tube has two symmetrically arranged through holes on its side wall, each through hole containing a pin that engages with the positioning holes.

[0007] Preferably, the connecting block is rectangular in design, and the end of the connecting block near the notch is beveled.

[0008] Preferably, a rotating sleeve is fixedly sleeved on the shaft, and a fixing rod is fixedly connected to the outer wall of the rotating sleeve.

[0009] Preferably, an arc-shaped groove is provided on the side wall of the connecting cover, and the fixing rod is slidably connected in the arc-shaped groove.

[0010] Preferably, a handle is fixedly connected to one end of the sliding rod that passes through the arc-shaped groove, and an anti-slip rubber sleeve is fitted on the handle.

[0011] Compared with the prior art, the advantages of this utility model are as follows: 1. Through the coordinated design of spring, connecting block, and hemispherical shell, the connecting block can be automatically pushed to slide and compress the spring when the traction ball is inserted. After it is fully inserted into the connecting cavity, the spring returns to its original position, the connecting block is precisely inserted into the notch, the arc surface fits tightly with the traction ball, and the inclined surface 2 increases the contact pressure to achieve all-round locking. It will not loosen even under heavy load and bumpy working conditions. The elastic coefficient of the spring is precisely matched to ensure that the locking force is moderate, which not only meets the traction requirements, but also avoids over-locking that would make unlocking difficult.

[0012] 2. When connecting, simply align the traction ball with the ball head socket and push it in to complete the self-locking process, without the need for additional tools; when unlocking, hold the handle and drive the fixing rod to rotate along the arc groove, and drive the connecting block to move backward and disengage from the notch by rotating the sleeve and shaft. The operation is labor-saving and can be completed by one person; the length adjustment is achieved by the cooperation of the pin with different positioning holes. The plug-in design does not require disassembly of parts, and the spacing adjustment can be completed within 20 seconds, adapting to different traction scenarios.

[0013] 3. The outer and inner tubes are made of high-strength alloy steel. The wall thickness and material selection have been mechanically calculated to withstand heavy traction without deformation. The double-sided full welding design of the connecting plate and the rectangular structure and inclined surface design of the connecting block 13 effectively disperse stress and avoid local damage. Key components such as springs and shafts are made of corrosion-resistant and fatigue-resistant materials. The connecting cover is rust-proofed and can adapt to harsh outdoor environments such as high temperature, humidity and dust, with a long service life. Attached Figure Description

[0014] Figure 1 A perspective view of a novel self-locking traction device proposed in this utility model; Figure 2This is a perspective view of the inner cylinder of a novel self-locking traction device proposed in this utility model; Figure 3 This is a cross-sectional view of the inner cylinder of a novel self-locking traction device proposed in this utility model; Figure 4 A perspective cross-sectional view of the inner cylinder of a novel self-locking traction device proposed in this utility model; Figure 5 Exploded perspective view of the connecting part of a novel self-locking traction device proposed in this utility model; Figure 6 This is a second exploded perspective view of the connecting part of a novel self-locking traction device proposed in this utility model; Figure 7 This is a first exploded view of the connecting shaft of a novel self-locking traction device proposed in this utility model; Figure 8 This is a second exploded view of the connecting shaft of a novel self-locking traction device proposed in this utility model.

[0015] In the diagram: 1 Outer tube, 2 Inner tube, 3 Connecting port, 4 Connecting cover, 5 Handle, 6 Pin, 7 Ball head socket, 8 Connecting block slide, 9 Positioning hole, 10 Arc groove, 11 Hemispherical shell, 12 Fixed rail, 13 Connecting block, 14 Arc surface, 15 Connecting plate, 16 Fixed rod, 17 First fixed block, 18 Rotating sleeve, 19 Spring, 20 Beveled surface, 21 Shaft, 22 Second fixed block. Detailed Implementation

[0016] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0017] Reference Figure 1-8 A novel self-locking traction device includes an outer tube 1 and an inner tube 2. Both the outer tube 1 and the inner tube 2 are integrally formed from high-strength alloy steel with a wall thickness of 8-12mm, combining lightweight and high strength characteristics, and can withstand a traction load of not less than 5 tons. The inner tube 2 is slidably sleeved inside the outer tube 1, and the gap between the two is controlled at 0.5-1mm to ensure smooth sliding and no radial wobble.

[0018] The end of the inner tube 2 is fixedly connected to the connection port 3 by argon arc welding. The connection port 3 is made by forging, with a dense structure and high strength. The end of the connection port 3 near the inner tube 2 is fixedly connected to the hemispherical shell 11. The inner wall of the hemispherical shell 11 is precision ground, with a surface roughness Ra≤0.8μm to reduce frictional wear with the traction ball. The interior of the hemispherical shell 11 is provided with a connection cavity. The inner diameter of the connection cavity is compatible with common traction ball specifications (compatible with mainstream specifications such as diameters of 50mm and 60mm). The end of the connection port 3 away from the hemispherical shell 11 is provided with a ball head insertion port 7 and a connecting block sliding port 8. The entrance of the ball head insertion port 7 is provided with a 30° chamfer to facilitate the rapid introduction of the traction ball.

[0019] A connecting plate 15 is fixedly connected to the end of the hemispherical shell 11 away from the connection port 3. The connecting plate 15 is made of alloy steel plate with a thickness of 10-15mm. It is fixedly connected to the inner wall of the inner tube 2 by double-sided welding. The welding joint adopts a full welding process, which effectively enhances the connection stability between the hemispherical shell 11 and the inner tube 2 and avoids detachment due to stress concentration during the traction process.

[0020] A connecting cover 4 is fixedly connected to the side wall of the inner tube 2. The connecting cover 4 is made by stamping and the surface is treated with anti-rust treatment (electrophoresis + spray painting) to effectively resist outdoor corrosive environment. A fixed rail 12 is fixedly connected inside the connecting cover 4. The inner wall of the rail 12 is provided with a guide groove. A connecting block 13 is slidably connected inside the fixed rail 12. The connecting block 13 is slidably connected in the connecting block slide 8. The end of the hemispherical shell 11 near the connecting block 13 has a notch that matches the connecting block 13. The size of the notch is precisely matched with the connecting block 13. The end of the connecting block 13 near the notch is provided with an arc surface 14 to ensure the fit with the traction ball. The connecting block 13 is rectangular and the end near the notch is designed with a bevel 20. The bevel 20 has an angle of 45° with the horizontal direction to facilitate the insertion of the traction ball.

[0021] A first fixing block 17 and a second fixing block 22 are fixedly connected to the inner wall of the connecting cover 4. The first fixing block 17 and the second fixing block 22 are slidably and rotatably connected to a shaft 21. The shaft 21 is made of 40Cr alloy steel and its surface is heat treated to achieve a hardness of HRC35-40, which combines strength and toughness. The end of the shaft 21 is rotatably connected to the connecting block 13 through a bearing to reduce rotational friction. The end of the connecting block 13 is elastically connected to the second fixing block 22 through a spring 19. The spring 19 is sleeved on the shaft 21 and is made of stainless steel with an elastic coefficient of 1.2-1.5 N / mm. After fatigue testing, it can withstand no less than 100,000 compression-reset cycles to ensure that it maintains good elasticity after long-term use.

[0022] The inner tube 2 has two sets of symmetrically arranged positioning holes 9 on its side wall, with 4-6 positioning holes 9 in each set and evenly spaced. The outer tube 1 has two symmetrically arranged through holes, with a pin 6 installed in each through hole. The pin 6 cooperates with the positioning hole 9. The end of the pin 6 is provided with an elastic retaining spring, which automatically pops out after being inserted into the positioning hole 9, realizing the self-locking and fixing of the pin 6 and preventing it from falling off during traction. The middle of the pin 6 is provided with anti-slip texture for easy manual insertion and removal.

[0023] A rotating sleeve 18 is fixedly sleeved on the shaft 21. A fixed rod 16 is fixedly connected to the outer wall of the rotating sleeve 18. The fixed rod 16 is perpendicular to the rotating sleeve 18 and is fixed by welding. An arc groove 10 is opened on the side wall of the connecting cover 4. The central angle of the arc groove 10 is 60°, which limits the rotation range of the fixed rod 16 and avoids excessive rotation that could damage the component. The fixed rod 16 is slidably connected in the arc groove 10, and a handle 5 is fixedly connected to one end of the fixed rod 16 that passes through the arc groove 10. The handle 5 is covered with an anti-slip rubber sleeve. The surface of the rubber sleeve has anti-slip texture, which not only ensures a comfortable grip but also effectively prevents slipping, allowing for stable operation even in humid environments.

[0024] When using this utility model, firstly, adjust the relative lengths of the outer tube 1 and the inner tube 2 according to the required traction distance. Then, pass the pin 6 through the through hole of the outer tube 1 and insert it into the corresponding positioning hole 9 of the inner tube 2 to fix the length. Next, align the traction ball with the ball head insertion port 7 of the connection port 3 and insert it. The traction ball pushes the inclined surface 20 of the connecting block 13, causing the connecting block 13 to slide along the fixed rail 12 and the connecting block slide 8, while compressing the spring 19. When the traction ball is fully inserted into the connecting cavity of the hemispherical shell 11, the spring 19 restores its elastic deformation, pushes the connecting block 13 into the notch of the hemispherical shell 11, and achieves the self-locking fixation of the traction ball, so that traction operation can be carried out. After the traction operation is completed, hold the handle 5 to drive the fixed rod 16 to slide along the arc groove 10. The fixed rod 16 drives the shaft 21 to rotate through the rotating sleeve 18. Due to the arc design of the arc groove 10, the shaft can be moved during the rotation of the fixed rod 16. The shaft 21 drives the connecting block 13 to disengage from the notch of the hemispherical shell 11 and compress the spring 19. At this time, the traction ball can be taken out from the ball head insertion port 7 to complete the unlocking.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel self-locking traction device, comprising an outer tube (1) and an inner tube (2), characterized in that, The inner tube (2) is fixedly connected to a connection port (3) at one end. A hemispherical shell (11) is fixedly connected to one end of the connection port (3) near the inner tube (2). A connection cavity is provided inside the hemispherical shell (11). A ball head insertion port (7) and a connecting block sliding port (8) are provided at one end of the connection port (3) away from the hemispherical shell (11). A connecting plate (15) is fixedly connected to one end of the hemispherical shell (11) away from the connection port (3). The connecting plate (15) is fixedly connected to the inner wall of the inner tube (2). A connecting cover (4) is fixedly connected to the side wall of the inner tube (2). A fixed rail (12) is fixedly connected inside the connecting cover (4). A connecting block (13) is slidably connected inside the fixed rail (12). The connecting block (13) is slidably connected in the connecting block slide (8). The hemispherical shell (11) has a notch at one end near the connecting block (13) that matches the connecting block (13). The connecting block (13) has an arc surface (14) at one end near the notch. The inner wall of the connecting cover (4) is fixedly connected to a first fixing block (17) and a second fixing block (22). The first fixing block (17) and the second fixing block (22) are slidably and rotatably connected to a shaft (21). The end of the shaft (21) is rotatably connected to the connecting block (13). The end of the connecting block (13) is elastically connected to the second fixing block (22) by a spring (19). The spring (19) is sleeved on the shaft (21).

2. The novel self-locking traction device according to claim 1, characterized in that, The inner tube (2) has two sets of symmetrically arranged positioning holes (9) on its side wall. Each set of positioning holes (9) has multiple holes and they are arranged at equal intervals. The outer tube (1) has two symmetrically arranged through holes on its side wall. The two through holes are equipped with pins (6), which cooperate with the positioning holes (9).

3. A novel self-locking traction device according to claim 2, characterized in that, The connecting block (13) is rectangular in design, and the end of the connecting block (13) near the notch is beveled.

4. A novel self-locking traction device according to claim 3, characterized in that, A rotating sleeve (18) is fixedly sleeved on the shaft (21), and a fixing rod (16) is fixedly connected to the outer wall of the rotating sleeve (18).

5. A novel self-locking traction device according to claim 4, characterized in that, An arc-shaped groove (10) is provided on the side wall of the connecting cover (4), and the fixing rod (16) is slidably connected in the arc-shaped groove (10).

6. A novel self-locking traction device according to claim 5, characterized in that, The fixed rod (16) is fixedly connected to a handle (5) at one end through the arc groove (10), and the handle (5) is covered with an anti-slip rubber sleeve.

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