Pull shaft tool for mechanical tubular column of steering system

Abstract

The utility model relates to the technical field of steering systems, in particular to a shaft pulling tool for a mechanical tubular column of a steering system. A shaft pulling tool for a mechanical tubular column of a steering system is characterized in that one side of a rack body is connected with one end of a connecting frame, the connecting frame is connected with a tool positioning bottom plate, a bearing positioning supporting block is arranged in the tool positioning bottom plate, and a tubular column positioning sleeve is arranged at the top of the bearing positioning supporting block; a pull shaft limiting block is arranged at the bottom of the bearing positioning supporting block; a pull shaft threaded sleeve is arranged below the pull shaft limiting block and located in the sleeve fixing mechanism. Compared with the prior art, by optimizing the tool structure, the shaft pulling process can be completed at an extremely high speed within the requirement range of the tool strength and hardware, signal delay and inertia of servo motion do not need to be considered, the assembly rhythm can be greatly improved, the equipment productivity is further improved, and due to the fact that tool abrasion is extremely slow, the assembly efficiency is greatly improved. And the stability of the pull shaft is very stable.

Description

Technical Field

[0001] The utility model relates to the technical field of steering systems, in particular to a shaft pulling tool used for a mechanical pipe column of a steering system. Background Art

[0002] The existing mechanical pipe string pulling process mainly uses displacement feedback to ensure the qualified rate of the pulled shaft length. This process requires the PLC to send an operation instruction to the servo motor, and the displacement sensor to monitor the servo operation displacement in real time. The displacement sensor feeds back the real-time displacement to the PLC. After the real-time displacement reaches the set parameter, the PLC sends a stop instruction to the servo motor, and the servo motor stops running, and the shaft pulling ends. Because the displacement sensor feedback, PLC receiving / sending instructions, and servo motor receiving instructions all involve signal transmission, there must be a certain delay. In addition, the inertia of servo operation starting and stopping will cause the actual size of the pulled shaft to be unstable. To ensure stability, the servo operation speed must be reduced to leave time for signal feedback, which will affect the production rhythm and reduce the production line capacity. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a shaft pulling tooling for a mechanical pipe column of a steering system. By optimizing the tooling structure, the stability of the mechanical pipe column shaft pulling is improved, while the beat is increased and the production line capacity is improved.

[0004] To achieve the above-mentioned purpose, a shaft pulling tooling for a mechanical pipe column of a steering system is designed, comprising a frame body and a connecting frame, and characterized in that: one side of the frame body is connected to one end of the connecting frame, the connecting frame is connected to a tooling positioning base plate, a bearing positioning support block is provided in the tooling positioning base plate, a pipe column positioning sleeve is provided on the top of the bearing positioning support block, and a shaft pulling limit block is provided at the bottom of the bearing positioning support block; a shaft pulling threaded sleeve is provided below the shaft pulling limit block, and the shaft pulling threaded sleeve is located in a sleeve fixing mechanism.

[0005] A displacement sensor is provided on the connecting frame located on one side of the pipe column positioning sleeve.

[0006] The pipe column positioning sleeve is a rectangular module structure. A through hole is provided in the center of the pipe column positioning sleeve. A limiting groove is provided on the pipe column positioning sleeve on one side of the through hole. The limiting groove is a T-shaped groove structure.

[0007] A connecting bolt connecting module is located on one side of the pipe column positioning sleeve. The connecting module has a rectangular groove structure and is provided with threaded holes for the connecting bolts.

[0008] The bearing positioning support block is a circular ring structure, one side of the bearing positioning support block is a flat surface, and the top of the bearing positioning support block is connected to a circular ring-shaped protrusion.

[0009] The pull shaft limit block is a disc-shaped structure, with a limit hole provided in the center of the pull shaft limit block, and fan-shaped holes are connected to the front and rear sides of the limit hole respectively; arc-shaped protrusions are connected to the upper part of the left and right sides of the limit hole respectively, and the inner arc surface of the arc-shaped protrusion is the limit surface.

[0010] The pull-shaft threaded sleeve is a cylindrical structure, a threaded hole is provided at the center of the pull-shaft threaded sleeve, and a connecting shaft connected to the servo motor is provided at the bottom of the pull-shaft threaded sleeve.

[0011] The connecting frame is in an L-shaped structure, the horizontal surface of the connecting frame is connected to the pipe column positioning sleeve, and the vertical surface of the connecting frame is connected to the frame body.

[0012] Compared with the existing technology, the present invention provides a shaft pulling tool for the mechanical pipe column of the steering system. By optimizing the tooling structure, since the shaft pulling length is guaranteed by the tooling, the shaft pulling process can be completed at an extremely fast speed within the requirements of the tooling strength and hardware, without considering the signal delay and the inertia of the servo motion, which can greatly improve the assembly cycle and thus improve the equipment production capacity, because the tooling wears very slowly and the stability of the shaft pulling is also very stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the utility model.

[0014] Figure 2 This is a cross-sectional view of the structure of the utility model.

[0015] Figure 3 This is a structural diagram of the positioning sleeve of the middle pipe column of the utility model.

[0016] Figure 4 This is a schematic diagram of the bearing positioning support block structure in the utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the pull shaft limit block in the utility model.

[0018] Figure 6 This is a structural diagram of the threaded sleeve of the pull shaft in the utility model. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figures 1 to 6As shown, one side of the frame body 6 is connected to one end of the connecting frame 9, and the connecting frame 9 is connected to the tool positioning base plate 3. A bearing positioning support block 2 is provided in the tool positioning base plate 3, and a pipe column positioning sleeve 1 is provided on the top of the bearing positioning support block 2, and a pull shaft limit block 5 is provided at the bottom of the bearing positioning support block 2; a pull shaft threaded sleeve 7 is provided below the pull shaft limit block 5, and the pull shaft threaded sleeve 7 is located in the sleeve fixing mechanism 8.

[0021] A displacement sensor 4 is provided on the connecting frame 9 located on one side of the pipe column positioning sleeve 1 .

[0022] The tooling positioning base plate 3 and the pulling shaft threaded sleeve 7 are fixed on the frame body 6, the displacement sensor 4, the pipe column positioning sleeve 1, the bearing positioning support block 2, and the pulling shaft limit block 5 are fixed on the tooling positioning base plate 3. The distance between the bearing positioning support block 2 and the pulling shaft limit block 5 ensures the length of the pulling shaft. The tightening gun rotates to drive the pulling shaft threaded sleeve 7 to rotate to toughen or unthread, thereby connecting the product and the servo motor. The servo motor drives the product to move to complete the pulling shaft.

[0023] The pipe column positioning sleeve 1 is a rectangular module structure. A through hole 1-1 is provided in the center of the pipe column positioning sleeve 1. A limiting groove 1-2 is provided on the pipe column positioning sleeve 1 on one side of the through hole 1-1. The limiting groove 1-2 is a T-shaped groove structure.

[0024] The through hole 1-1 and the limiting groove 1-2 in the column positioning sleeve 1 ensure that the upper column tube is fixed in position and the product is well centered; and prevent the pull shaft from being skewed.

[0025] A connecting bolt connecting module 1-3 is located on one side of the pipe column positioning sleeve 1. The connecting module 1-3 is a rectangular groove structure, and a threaded hole 1-4 for the connecting bolt is provided on the connecting module 1-3.

[0026] The bearing positioning support block 2 is a circular ring structure, one side of the bearing positioning support block 2 is a flat surface, and the top of the bearing positioning support block 2 is connected to a circular ring-shaped protrusion 2-1.

[0027] The annular protrusion 2-1 of the bearing positioning support block 2 is used to support the inner ring of the bearing and is also the force support surface of the pull shaft. It has high requirements for hardness and wear resistance. The protrusion height of the annular protrusion 2-1 determines the length of the pull shaft, and the inner diameter of the bearing positioning support block 2 determines the product position.

[0028] The pull shaft limit block 5 is a disc-shaped structure, with a limit hole provided in the center of the pull shaft limit block 5, and fan-shaped holes 5-2 are connected to the front and rear sides of the limit hole respectively; arc-shaped protrusions 5-1 are connected to the upper left and right sides of the limit hole respectively, and the inner arc surface of the arc-shaped protrusion 5-1 is the limit surface.

[0029] The limiting surface of the pull shaft limit block 5 determines the stop position of the pull shaft, thereby ensuring the length of the pull shaft. The pull shaft limit block 5 needs to withstand a force greater than 5000N, and has high requirements for hardness and wear resistance.

[0030] The pull-shaft threaded sleeve 7 is a cylindrical structure, a threaded hole 7 - 1 is provided at the center of the pull-shaft threaded sleeve 7 , and a connecting shaft 7 - 2 connected to the servo motor is provided at the bottom of the pull-shaft threaded sleeve 7 .

[0031] The tooling for connecting the pull shaft threaded sleeve 7 with the servo motor, the inner hole of the pull shaft threaded sleeve 7 is a threaded hole 7-1, which cooperates with the external thread of the product. The internal thread size of the pull shaft threaded sleeve 7 is required to be high, and it needs to be compatible with the tolerance of the product external thread. Under the premise of ensuring the stability of the pull shaft displacement detection, the product must not be stuck, causing equipment downtime.

[0032] The connecting frame 9 is in an L-shaped structure. The horizontal surface of the connecting frame 9 is connected to the pipe column positioning sleeve 1 , and the vertical surface of the connecting frame 9 is connected to the frame body 6 .

[0033] The pipe column positioning sleeve 1 and the bearing positioning support block 2 are installed on the top of the tooling positioning base plate 3 through positioning pins and nuts. The pull shaft limit block 5 is installed on the bottom of the tooling positioning base plate 3 through positioning pins and nuts. The distance between the upper end face of the bearing positioning support block 2 and the limiting face of the pull shaft limit block 5 is the product pull shaft length. The pull shaft threaded sleeve 7 is connected to the servo motor and the torque gun through a mechanical structure. The torque gun connects the pull shaft threaded sleeve 7 to the steering shaft, and the servo motor provides power for the pull shaft.

[0034] The product (i.e., the column assembly and steering shaft assembly) is placed within the column positioning sleeve 1. This sleeve 1 controls the position of the column and steering shaft assemblies, ensuring perfect concentricity among the steering shaft, bearing, column tube, pull-shaft stopper, and pull-shaft sleeve. The pull-shaft threaded sleeve 7 uses a torque gun to tighten the sleeve threads to the steering shaft threads. A servo motor drives the pull-shaft. The bearing positioning support block 2 serves as the bearing's load support point and also as a reference for the pull-shaft length. The pull-shaft stopper 5 serves as the pull-shaft stopping point. The servo motor pulls the steering shaft to a fixed force, ensuring proper alignment between the steering shaft and the pull-shaft stopper. The distance between the bearing positioning support block 2 and the pull-shaft stopper 5 determines the pull-shaft length. Because the pull-shaft length is guaranteed by the tooling, the pull-shaft process can be completed extremely quickly within the tooling strength and hardware requirements, without considering signal delays or servo motion inertia. This significantly improves assembly cycle time and, in turn, increases equipment production capacity. Because the tooling wears very slowly, the pull-shaft stability is also very stable.

Claims

1. A shaft pulling tool for a mechanical column of a steering system, comprising a frame body and a connecting frame, characterized in that: One side of the frame body (6) is connected to one end of the connecting frame (9), and the connecting frame (9) is connected to the tool positioning base plate (3). A bearing positioning support block (2) is provided in the tool positioning base plate (3), a pipe column positioning sleeve (1) is provided on the top of the bearing positioning support block (2), and a pull shaft limiting block (5) is provided at the bottom of the bearing positioning support block (2); a pull shaft threaded sleeve (7) is provided below the pull shaft limiting block (5), and the pull shaft threaded sleeve (7) is located in the sleeve fixing mechanism (8).

2. The pull shaft fixture for a mechanical column of a steering system according to claim 1, characterized in that: A displacement sensor (4) is provided on a tool positioning base plate (3) located on one side of the pipe column positioning sleeve (1).

3. The shaft pulling tool for a mechanical column of a steering system according to claim 1, characterized in that: The pipe column positioning sleeve (1) is a rectangular module structure. A through hole (1-1) is provided at the center of the pipe column positioning sleeve (1). A limiting groove (1-2) is provided on the pipe column positioning sleeve (1) on one side of the through hole (1-1). The limiting groove (1-2) is a T-shaped groove structure.

4. The shaft pulling tool for a mechanical column of a steering system according to claim 3, characterized in that: A connecting bolt connection module (1-3) is located on one side of the pipe column positioning sleeve (1). The connection module (1-3) is in a rectangular groove structure, and a threaded hole (1-4) for the connecting bolt is provided on the connection module (1-3).

5. The shaft pulling tool for a mechanical column of a steering system according to claim 1, characterized in that: The bearing positioning support block (2) is a circular ring structure, one side of the bearing positioning support block (2) is a plane, and the top of the bearing positioning support block (2) is connected to the circular ring-shaped protrusion (2-1).

6. The shaft pulling tool for a mechanical column of a steering system according to claim 1, characterized in that: The pull shaft limit block (5) is a disc-shaped structure, with a limit hole provided at the center of the pull shaft limit block (5), and fan-shaped holes (5-2) connected to the front and rear sides of the limit hole respectively; arc-shaped protrusions (5-1) are connected to the upper sides of the left and right sides of the limit hole respectively, and the inner arc surface of the arc-shaped protrusion (5-1) is the limit surface.

7. The shaft pulling tool for a mechanical column of a steering system according to claim 1, characterized in that: The pull-shaft threaded sleeve (7) is a cylindrical structure, a threaded hole (7-1) is provided at the center of the pull-shaft threaded sleeve (7), and a connecting shaft (7-2) connected to the servo motor is provided at the bottom of the pull-shaft threaded sleeve (7).

8. The shaft pulling tool for a mechanical column of a steering system according to claim 1, characterized in that: The connecting frame (9) is an L-shaped structure, the horizontal surface of the connecting frame (9) is connected to the pipe column positioning sleeve (1), and the vertical surface of the connecting frame (9) is connected to the frame body (6).

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