Rigidity testing equipment for tubular column

Abstract

The utility model provides rigidity testing equipment for a tubular column, which comprises a servo press module, a rigidity measuring module and a clamp module which are sequentially arranged, the servo press module and the clamp module are respectively and fixedly arranged at two ends of a test board, and the rigidity measuring module is movably fixed between the servo press module and the clamp module based on the test board; the rigidity measuring module comprises a jacking tool used for jacking the upper pipe column and a grabbing mechanism used for grabbing the input shaft, the jacking tool is movably fixed to the upper side of the grabbing mechanism, and a displacement sensor facing the jacking tool is fixedly arranged on the basis of the upper side of the grabbing mechanism. According to the utility model, the displacement of the input shaft is read by clamping the upper tubular column and applying pressure to the input shaft, so that the rigidity test process of the product is calculated without manual participation, the accuracy of the test result is ensured, the test process is automatically completed by a mechanical structure, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to a pipe column stiffness testing device. Background Art

[0002] At present, the existing technology of automobiles transmits its performance and characteristics to the driver through its steering system. Among them, the steering column of the steering system is an important bridge in this process. The steering column is the main control device of the steering system. The vehicle's perception of the road is transmitted to the driver through the steering column, and the torque transmitted to each wheel through the steering column is the driver's control of the vehicle. Figure 1 As shown, the steering column includes an upper column and an input shaft inserted into the upper column.

[0003] During the development and testing of the steering column, various parameters need to be tested. Among them, the stiffness of the steering column is a particularly important parameter in the development and testing process. As the steering transmission mechanism of the car, the stiffness of the steering column determines the natural frequency of the steering column. The greater the rigidity, the higher the natural frequency within a certain range, which can effectively avoid the resonance effect caused by the vibration transmitted from the whole vehicle or chassis system, and avoid shaking of the steering wheel when driving, especially at high speeds.

[0004] However, in the existing technology, the stiffness test device for the steering column needs to be manually adjusted in the horizontal and vertical directions. In order to reduce the workload of employees during operation during the test, a lever structure is usually used to apply force, resulting in a large occupation of the workspace and unstable control accuracy. The test process requires two people to cooperate in control, one of whom operates the lever to maintain balance, and the other operates the measurement system to clear and save data, resulting in low test efficiency. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the defects of the prior art. The utility model proposes a string stiffness testing device, which uses a mechanical structure to fix the upper string and the input shaft respectively, and then completes the string stiffness testing process, thereby avoiding the influence of manpower on the test results and improving the test efficiency.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a pipe string stiffness testing device, comprising a servo press module, a stiffness measurement module and a fixture module arranged in sequence, wherein the servo press module and the fixture module are respectively fixedly arranged at two ends of the test bench, and the stiffness measurement module is fixed between the servo press module and the fixture module based on the activity of the test bench;

[0007] The stiffness measurement module includes a tightening tool for tightening the upper pipe column and a gripping mechanism for gripping the input shaft. The tightening tool is movably fixed to the upper side of the gripping mechanism. A displacement sensor facing the tightening tool is fixedly arranged on the upper side of the gripping mechanism.

[0008] Furthermore, a first slide rail is fixedly arranged along the length direction of the test bench, a first movable plate is movably fixed on the first slide rail, a second slide rail is also arranged along the length direction of the first movable plate, the grasping mechanism is fixedly arranged on the second movable plate which can reciprocate along the second slide rail, the grasping mechanism includes a centering manipulator and a clamping claw arranged facing the fixture module, and the clamping claw is movably fixed on the centering manipulator.

[0009] Furthermore, the centering robot is fixedly arranged based on a first support fixedly arranged on the second movable plate, and a fixed block and a sliding rod are fixedly arranged on the upper surface of the first support, the fixed block is sleeved on the sliding rod, the tightening tooling is fixed to one end of the sliding rod, and the tightening tooling is located between the clamping jaw and the clamp module.

[0010] Furthermore, based on the second slide rail, a third movable plate which can reciprocate along the second slide rail is also provided, and a second support connected to the servo press module is fixedly provided on the third movable plate, and the first support and the second support are connected by a spring transmission mechanism.

[0011] Furthermore, the spring transmission mechanism includes a bolt that passes through the first support and is fixed on the second support, a nut is sleeved on the part of the bolt between the first support and the second support, a first spring is arranged between the head of the bolt and the first support and between the nut and the first support, and a spring resisting plate is fixedly arranged on the side of the first support facing the first spring.

[0012] Furthermore, a transverse cylinder is fixedly arranged on the second support, the transverse cylinder and the slide bar are in the same plane, and one end of the telescopic rod of the transverse cylinder faces the end of the slide bar facing away from the tightening tooling.

[0013] Furthermore, a push rod is provided at the end of the telescopic rod of the transverse cylinder, and the push rod is coaxially fixed with the telescopic rod. A push plate is fixedly provided at one end of the sliding rod facing away from the tightening tooling, and the push rod passes through the top plate. A second spring is sleeved on the push rod, and the second spring is located between the transverse cylinder and the top plate.

[0014] Furthermore, the clamp module includes a fixed seat, positioning trays are fixedly arranged at both ends of the fixed seat in the length direction, a clamping cylinder is fixedly arranged between the positioning trays, and a positioning pin is added to the opposite side of the clamping claw of the clamping cylinder.

[0015] Compared with the prior art, the beneficial effects of the utility model include: fixing the upper pipe column by applying a tightening tool, clamping and fixing the input shaft with a centering manipulator, and then driving the centering manipulator with a servo press module, and reading the displacement of the input shaft by a displacement sensor, thereby calculating the stiffness of the pipe column, and the test process does not require human participation, thereby ensuring the accuracy of the test results, and the test process is automatically completed by the mechanical structure, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0017] Figure 1 The overall structure of the pipe string is shown schematically;

[0018] Figure 2 The overall structure of the string stiffness testing equipment is schematically shown;

[0019] Figure 3 The overall structure of the fixture module is schematically shown;

[0020] Figure 4 The overall structure of the stiffness measurement module is schematically shown;

[0021] Figure 5 The schematic diagram shows the side view structure of the stiffness measurement module.

[0022] Numbers in the figure: 1-servo press module, 2-stiffness measurement module, 21-centering manipulator, 22-clamping claw, 23-tightening tooling, 24-fixed block, 25-slide rod, 26-lateral cylinder, 27-spring transmission mechanism, 271-bolt, 272-nut, 273-first spring, 274-spring back plate, 28-second spring, 3-clamp module, 31-clamping claw cylinder, 32-locating pin, 33-locating tray, 4-test bench, 5-first slide rail, 6-first movable plate, 7-second slide rail, 8-second movable plate, 9-third movable plate, 10-first support, 11-second support. DETAILED DESCRIPTION

[0023] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.

[0024] Figure 2 The overall structure of the string stiffness test device is schematically shown. A string stiffness test device such as Figure 2 As shown, the test bench 4 includes a servo press module 1, a stiffness measurement module 2 and a fixture module 3, which are sequentially arranged on the test bench 4. The servo press module 1 and the fixture module 3 are respectively fixedly arranged at both ends of the test bench 4, and the stiffness measurement module 2 is movably fixed between the servo press module 1 and the fixture module 3 based on the test bench 4. The pipe column is fixed by the fixture module 3, and the input shaft part of the pipe column is clamped by the stiffness measurement module 2, and the servo press module 1 pushes the stiffness measurement module 2 to the product test position and applies a radial force of ±500N to the product through the stiffness measurement module 2 to complete the test process.

[0025] Figure 3 The schematic diagram shows the overall structure of the fixture module, combined with Figure 3 The fixture module 3 is described in detail. The fixture module 3 includes a fixed seat, and a positioning tray 33 is fixedly arranged at both ends of the fixed seat in the length direction. The positioning tray 33 has an embedding groove adapted to the outer edge of the pipe column on the upper side, which can perform preliminary positioning or limiting of the pipe column. Later, based on the area between the positioning trays 33 arranged at both ends, a clamping claw is fixedly arranged on the fixed seat. The clamping claw is driven by the clamping claw cylinder 31 to reciprocate along the width direction of the fixed seat, thereby clamping the pipe column and completing further fixing of the pipe column. Finally, a conical positioning pin 32 is added on the opposite side of the clamping claw, and a hole groove is correspondingly opened on the upper pipe column. The positioning pin 32 is embedded in the hole groove to perform the final fixing of the pipe column, that is, after the pipe column is roughly positioned by the positioning tray 33, the pipe column is precisely positioned by the clamping claw and the conical positioning pin 32 to ensure the centering and positioning of the product.

[0026] Figure 4 The schematic diagram shows the overall structure of the stiffness measurement module, combined with Figure 4The stiffness measurement module 2 is described in detail. The stiffness measurement module 2 includes a clamping fixture 23 for clamping the upper pipe column and a gripping mechanism for gripping the input shaft. The clamping fixture 23 is movably fixed on the upper side of the gripping mechanism. The clamping fixture 23 is a claw structure. The pipe column can be supported by the claw structure arranged on the clamping fixture 23. A displacement sensor facing the clamping fixture 23 is fixedly arranged on the upper side of the gripping mechanism. The displacement of the upper pipe column compared to the input shaft during the test is read and recorded by the displacement sensor, so as to judge the stiffness of the pipe column.

[0027] A first slide rail 5 is fixedly arranged along the length direction of the aforementioned test bench 4, a first movable plate 6 is movably fixed on the first slide rail 5, and a second slide rail 7 is also arranged along the length direction of the first movable plate 6. The grasping mechanism is fixedly arranged on the second movable plate 8 which can reciprocate along the second slide rail 7. The aforementioned grasping mechanism includes a centering manipulator 21 and a clamping jaw 22 arranged facing the clamp module 3. The clamping jaw 22 is movably fixed on the centering manipulator 21. The input shaft is clamped and fixed in the circumferential direction by using the clamping jaw 22 movably fixed on the centering manipulator 21. The clamping jaw 22 can be movably fixed along the radial direction of the centering manipulator 21.

[0028] The aforementioned centering robot 21 is fixedly arranged based on the first support 10 fixedly arranged on the second movable plate 8, and a fixed block 24 and a sliding rod 25 are fixedly arranged on the upper surface of the first support 10, and the fixed block 24 is sleeved on the sliding rod 25. The tightening tool 23 is fixed to one end of the sliding rod 25, and the sliding rod 25 can reciprocate in the fixed block 24. The tightening tool 23 is located between the clamp 22 and the fixture module 3. The upper pipe column is supported by the tightening tool 23, and the input shaft is grasped by the centering robot 21, and the test process is completed under the drive of the servo press module 1.

[0029] Based on the aforementioned second slide rail 7, a third movable plate 9 is also provided which can reciprocate along the second slide rail 7, and a second support 11 connected to the servo press module 1 is fixedly provided on the third movable plate 9, and the first support 10 is connected to the second support 11 by a spring transmission mechanism 27. The force given to the second support 11 by the servo press module 1 is transmitted to the first support 10 by the spring transmission mechanism 27, thereby completing the test process.

[0030] Figure 5 The schematic diagram shows the side view structure of the stiffness measurement module, combined with Figure 5The spring transmission mechanism 27 is described in detail. The spring transmission mechanism 27 includes a bolt 271 that passes through the first support 10 and is fixed on the second support 11. A nut 272 is sleeved on the portion of the bolt 271 located between the first support 10 and the second support 11. A first spring 273 is provided between the head of the bolt 271 and the first support 10 and between the nut 272 and the first support 10. A spring abutment plate 274 is fixedly provided on one side of the first support 10 facing the first spring 273. Through the cooperation of the bolt 271 or the nut 272 and the spring abutment plate 274, at most one first spring 273 located on both sides of the moving direction of the first support 10 can be in a compressed state, and the head of the bolt 271 or the nut 272 serves as a pressure surface on one side of the first spring 273. When the servo press extends or retracts, the force can be transmitted to the stiffness measurement module 2 through the compression of the first spring 273.

[0031] A transverse cylinder 26 is fixedly arranged on the aforementioned second support 11. The transverse cylinder 26 and the slide bar 25 are in the same plane, and one end of the telescopic rod of the transverse cylinder 26 faces the end of the slide bar 25 facing away from the top clamping fixture 23. A push rod is added to the end of the telescopic rod of the transverse cylinder 26. The push rod is coaxially fixed with the telescopic rod. A push plate is fixedly arranged on the end of the slide bar 25 facing away from the top clamping fixture 23. The push rod passes through the aforementioned top plate, and a second spring 28 is sleeved on the push rod. The second spring 28 is located between the transverse cylinder 26 and the top plate. The top plate serves as the pressure surface of one side of the second spring 28, thereby transmitting the force compression of the transverse cylinder 26 to the top plate; and the transverse cylinder 26 is mainly used to drive the top clamping fixture 23 to the corresponding position in the early stage of the test to adapt to the distance between the upper pipe column and the input shaft between different pipe columns, so as to ensure the accuracy of the test results.

[0032] During the actual test, the stiffness measurement module 2 clamps the input shaft of the product through the centering manipulator 21 and the clamping jaws 22. The transverse cylinder 26 drives the tightening tooling 23 to tighten one side of the upper pipe column of the product. The servo press first provides a radial pressure of 500N, and the displacement sensor reads and records the displacement of the upper pipe column. The servo press then pulls back and provides a radial pressure of 500N. The displacement sensor reads and records the displacement of the upper pipe column again.

[0033] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A string stiffness testing device, characterized in that: The invention comprises a servo press module (1), a stiffness measurement module (2) and a fixture module (3) which are arranged in sequence, wherein the servo press module (1) and the fixture module (3) are respectively fixedly arranged at two ends of a test bench (4), and the stiffness measurement module (2) is movably fixed between the servo press module (1) and the fixture module (3) based on the test bench (4); The stiffness measurement module (2) comprises a tightening tool (23) for tightening an upper pipe column and a gripping mechanism for gripping an input shaft, the tightening tool (23) being movably fixed to the upper side of the gripping mechanism, and a displacement sensor facing the tightening tool (23) being fixedly arranged on the upper side of the gripping mechanism.

2. The string stiffness testing device according to claim 1, characterized in that: A first slide rail (5) is fixedly arranged along the length direction of the test bench (4), a first movable plate (6) is movably fixed on the first slide rail (5), a second slide rail (7) is also arranged along the length direction of the first movable plate (6), the grasping mechanism is fixedly arranged on the second movable plate (8) which can reciprocate along the second slide rail (7), the grasping mechanism comprises a centering manipulator (21) and a clamping claw (22) arranged facing the clamp module (3), and the clamping claw (22) is movably fixed on the centering manipulator (21).

3. The string stiffness testing device according to claim 2, characterized in that: The centering robot (21) is fixedly arranged on a first support (10) fixedly arranged on a second movable plate (8), and a fixed block (24) and a sliding rod (25) are fixedly arranged on the upper surface of the first support (10), the fixed block (24) is sleeved on the sliding rod (25), the clamping tool (23) is fixed on one end of the sliding rod (25), and the clamping tool (23) is located between the clamping jaw (22) and the clamp module (3).

4. The string stiffness testing device according to claim 3, characterized in that: Based on the second slide rail (7), a third movable plate (9) capable of reciprocating along the second slide rail (7) is also provided, and a second support (11) connected to the servo press module (1) is fixedly provided on the third movable plate (9), and the first support (10) and the second support (11) are connected by a spring transmission mechanism (27).

5. The string stiffness testing device according to claim 4, characterized in that: The spring transmission mechanism (27) comprises a bolt (271) passing through the first support (10) and fixed to the second support (11); a nut (272) is sleeved on the portion of the bolt (271) located between the first support (10) and the second support (11); a first spring (273) is arranged between the head of the bolt (271) and the first support (10) and between the nut (272) and the first support (10); and a spring stop plate (274) is fixedly arranged on the first support (10) on a side facing the first spring (273).

6. The string stiffness testing device according to claim 4, characterized in that: A transverse cylinder (26) is fixedly arranged on the second support (11), the transverse cylinder (26) and the slide bar (25) are in the same plane, and one end of the telescopic rod of the transverse cylinder (26) faces the slide bar (25) and is away from the end of the tightening tooling (23).

7. The string stiffness testing device according to claim 6, characterized in that: A push rod is provided at the end of the telescopic rod of the transverse cylinder (26), and the push rod is coaxially fixed with the telescopic rod. A push plate is fixedly provided at one end of the slide rod (25) facing away from the clamping tool (23), and the push rod passes through the push plate. A second spring (28) is sleeved on the push rod, and the second spring (28) is located between the transverse cylinder (26) and the push plate.

8. The string stiffness testing device according to claim 1, characterized in that: The clamp module (3) comprises a fixed seat, positioning trays (33) are fixedly arranged at both ends of the fixed seat in the length direction, a clamping claw cylinder (31) is fixedly arranged between the positioning trays (33), and a positioning pin (32) is added to the side opposite to the clamping claw of the clamping claw cylinder (31).

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