Full-automatic torque testing device for automobile steering device

Abstract

The invention discloses a full-automatic torque testing device for an automobile steering device, and belongs to the technical field of automobile part torque testing. Comprising a positioning tool and a transfer platform capable of horizontally moving towards the positioning tool. The automobile steering device can be fixed on the positioning tool, and a to-be-detected shaft on the automobile steering device can face the transfer platform; the transfer platform is provided with a rotating clamp capable of clamping a shaft to be detected. The rotating clamp is in transmission connection with the air bearing through the universal coupling, the air bearing can be in transmission connection with the flexible coupling through the positioning shaft, the flexible coupling is in transmission connection with the torque angle sensor, and the transfer platform is provided with a driving module capable of driving the rotating clamp to drive the to-be-detected shaft to rotate; the full-automatic torque testing device for the automobile steering device solves the problem that the influence of the transmission process on the torque test cannot be effectively eliminated in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of torque testing of automobile parts, and in particular relates to a full-automatic torque testing device for an automobile steering gear. Background Art

[0002] During the production process of automobile steering gears, torque tests are required to ensure that their performance meets the requirements. Traditional methods for testing the torque of automobile steering gears mainly use manual testing and semi-automatic testing. Manual testing has many disadvantages, such as: (1) manual testing cannot measure the accurate torque data of the steering gear middle rod during rotation; (2) manual testing cannot accurately control the detection angle within the detection range of plus or minus 450°; (3) the results of manual testing cannot bind and match the product torque performance parameters with the product.

[0003] However, the existing semi-automatic detection device cannot effectively eliminate the influence of the transmission process on the torque test during the test due to the limitations of its structure and working mode. The specific influence is mainly reflected in factors such as friction and clearance between various components and instability of transmission. Each influence may cause deviation in the torque test results.

[0004] Therefore, there is an urgent need for a fully automatic torque testing device that can accurately test the torque of an automobile steering gear. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fully automatic torque testing device for an automobile steering gear, which solves the problem in the prior art that the influence of the transmission process on the torque test cannot be effectively eliminated.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a fully automatic torque testing device for an automobile steering gear, comprising a positioning tool and a transfer platform capable of horizontally moving toward the positioning tool; Wherein, the automobile steering gear can be fixed on the positioning fixture, and the axis to be detected on the automobile steering gear can be directed toward the transfer platform; a rotating fixture capable of clamping the axis to be detected is provided on the transfer platform; The rotating fixture is connected to the air bearing through a universal coupling, the air bearing can be connected to the flexible coupling through a positioning shaft, the flexible coupling is connected to the torque angle sensor, and the transfer platform is provided with a driving module that can drive the rotating fixture to drive the shaft to be detected to rotate through the torque angle sensor, the flexible coupling, the positioning shaft, the air bearing and the universal coupling.

[0007] Optionally, the rotary fixture includes a clamping claw cylinder capable of clamping the shaft to be tested, the clamping claw cylinder can be connected to an air source through a socket, a first quick plug is provided on the socket, and a second quick plug capable of moving toward the socket and plugging with the first quick plug is provided on the transfer platform; Wherein, after the second quick plug is pulled out from the first quick plug, the first quick plug can close the interface.

[0008] Optionally, the second quick plug is arranged on a slide, and the slide can be slidably connected to a gantry arranged around the outer periphery of the socket through a first linear guide rail, and a positioning base is slidably connected to the first linear guide rail, and the positioning base is provided with a positioning pin that can be plugged into the socket, and the positioning base or the slide is provided with a first driving unit that can drive the positioning pin and the second quick plug to move toward the socket.

[0009] Optionally, a groove-shaped positioning portion is provided on the positioning shaft, and a photoelectric sensor capable of corresponding to the groove-shaped positioning portion is provided on the transfer platform.

[0010] Optionally, the positioning shaft is sleeved with an annular counterweight.

[0011] Optionally, the driving module includes a servo motor and a reducer arranged at an output end of the servo motor, and the output end of the reducer is provided with a torque limiter transmission-connected to the torque angle sensor.

[0012] Optionally, the transfer platform can be slidably connected to the horizontal workbench via a second linear guide rail, and the horizontal workbench is provided with a second driving unit capable of driving the transfer platform to move.

[0013] Optionally, the positioning fixture is overlapped on the mounting plate through a group of relatively arranged support plates, and the positioning fixture is detachably connected to the support plate through bolts and quick-change positioning pins.

[0014] Optionally, it also includes a barcode scanner capable of identifying the automobile steering gear code, and the barcode scanner is electrically connected to the torque angle sensor.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) By adding a torque angle sensor between the drive module and the rotating fixture, when the rotating fixture drives the shaft to be tested on the automobile steering gear to rotate, the torque angle sensor can accurately measure the torque and rotation angle output by the drive module to the rotating fixture; adding a flexible coupling can effectively compensate for the axial, radial and angular displacement deviations between the drive module and the rotating fixture to ensure normal transmission; adding a positioning shaft can provide an accurate positioning reference for the rotating fixture; adding an air bearing can provide a higher radial and axial rotation accuracy for the rotation of the rotating fixture, while reducing transmission friction. In summary, the fully automatic torque testing device for automobile steering gears in this technical solution can effectively avoid the influence of various unstable factors on the torque test results and improve the accuracy of automobile steering gear torque testing; (2) The first drive unit drives the second quick plug to be plugged in and out of the first quick plug, which can control the clamping action of the clamping cylinder to clamp the shaft to be tested without affecting the rotation of the clamping cylinder. At the same time, the second drive unit drives the transfer platform to approach or move away from the positioning tooling, which can effectively increase the degree of automation of the automobile steering gear torque test and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the structure of a fully automatic torque testing device for a vehicle steering gear in a preferred embodiment of the present invention from above; Figure 2 It is a structural schematic diagram of a fully automatic torque testing device for an automobile steering gear in a preferred embodiment of the present invention; Figure 3 In the preferred embodiment of the present invention Figure 2 A schematic diagram of the local enlarged structure at B; Figure 4 It is a structural schematic diagram of a preferred embodiment of the present invention when the positioning tool is arranged on a support plate; Figure 5 It is a structural schematic diagram of a preferred embodiment of the present invention in which a slide seat and a positioning base are arranged on a gantry through a first linear guide rail; Figure 6 It is a structural schematic diagram of a fully automatic torque testing device for a vehicle steering gear in a preferred embodiment of the present invention when it is arranged on a frame; Among them, 1. transfer platform; 2. automobile steering gear; 201. axis to be tested; 3. universal coupling; 4. air bearing; 5. positioning shaft; 501. slot-type positioning part; 6. flexible coupling; 7. torque angle sensor; 8. clamping cylinder; 9. socket; 10. first quick plug; 11. second quick plug; 12. slide seat; 13. first linear guide; 14. gantry; 15. positioning base; 16. positioning pin; 17. first drive unit; 18. photoelectric sensor; 19. annular counterweight; 20. servo motor; 21. reducer; 22. torque limiter; 23. second linear guide; 24. horizontal workbench; 25. second drive unit; 26. mounting plate; 27. support plate; 28. positioning tooling; 29. ​​bolt; 30. quick-change positioning pin; 31. barcode scanner. DETAILED DESCRIPTION

[0018] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, the directional indication is only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise clearly specified and defined, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0020] like Figure 1-Figure 6As shown, a fully automatic torque testing device for an automobile steering gear includes a positioning fixture 28 and a transfer platform 1 that can move horizontally toward the positioning fixture 28. The automobile steering gear 2 can be fixed on the positioning fixture 28, and can make the shaft 201 to be tested on the automobile steering gear 2 face the transfer platform 1; the transfer platform 1 is provided with a rotating fixture that can clamp the shaft 201 to be tested. Among them, the transfer platform 1 can be slidably connected to the horizontal workbench 24 through the second linear guide rail 23 to improve the accuracy of the linear motion of the transfer platform 1. At the same time, the horizontal workbench 24 is provided with a second driving unit 25 that can drive the transfer platform 1 to move. The second driving unit 25 can drive the rotating fixture to move toward the automobile steering gear 2 on the positioning fixture 28 within the travel range of the transfer platform 1, so that the rotating fixture can accurately clamp the shaft 201 to be tested on the automobile steering gear 2.

[0021] In order to reduce and avoid the deviation of torque test results caused by unstable transmission of the rotating fixture, the rotating fixture is connected to the air bearing 4 through the universal coupling 3, the air bearing 4 can be connected to the flexible coupling 6 through the positioning shaft 5, the flexible coupling 6 is connected to the torque angle sensor 7, and the transfer platform 1 is provided with a driving module that can drive the rotating fixture to drive the shaft 201 to be tested to rotate through the torque angle sensor 7, the flexible coupling 6, the positioning shaft 5, the air bearing 4 and the universal coupling 3. In this technical solution, the driving module can drive the rotating fixture to drive the shaft 201 to be tested on the steering gear 2 of the car to rotate by positive and negative 450 degrees.

[0022] The torque limiter 22, torque angle sensor 7, flexible coupling 6, air bearing 4 and universal coupling 3 mentioned above are all prior art. The air bearing 4 has the same function as the bearing, but is different from the traditional bearing. The intermediate shaft is suspended inside and the intermediate gap is air, so the friction coefficient is extremely low, which can effectively reduce the impact of friction in the transmission process on the test results; the universal coupling 3 can slide in two directions perpendicular to the rotation axis of the rotating fixture, and the two directions are perpendicular to each other, that is, within the effective range of the universal coupling 3, the rotating fixture can move arbitrarily in a plane perpendicular to its rotation axis to deal with the deviation of the central axis position of the automobile steering gear 2; the flexible coupling 6 is a corrugated flexible coupling in the prior art, and the advantage of the flexible coupling 6 is that it can absorb the non-concentric deviation of the axis caused by the machining tolerance of the machined parts; the torque angle sensor 7 is a high-precision torque angle photoelectric sensor 18 in the prior art, which can transmit the torque data and angle signal of the test to electronic equipment such as computers in real time. At the same time, there are multiple different indicator lights on it, which can display the current operating status of the torque angle sensor 7. The data detected in real time by the torque angle sensor 7 can also exchange information with the barcode scanner 31 that can identify the code of the automobile steering gear 2. The barcode scanner 31 is a prior art that can store, display, mark, etc. the identified code information through electronic devices such as computers, so as to track the status of each automobile steering gear 2 in real time.

[0023] Specifically, by arranging the torque angle sensor 7, the flexible coupling 6, the positioning shaft 5, the air bearing 4 and the universal coupling 3 between the driving module and the rotating fixture for transmission, various factors such as instability that affect the torque test results can be effectively avoided, and the accuracy of the torque test can be effectively improved.

[0024] Further, such as Figure 3 , Figure 5As shown, the aforementioned rotary fixture includes a clamping claw cylinder 8 capable of clamping the shaft 201 to be detected. The clamping claw cylinder 8 can be selected from the prior art three-claw cylinder, four-claw cylinder, etc., to ensure the concentricity and stability of the clamping of the shaft 201 to be detected. The clamping claw cylinder 8 can be connected to the air source through the socket 9, and the socket 9 is provided with a first quick plug 10. The transfer platform 1 is provided with a second quick plug 11 that can move toward the socket 9 and plug and match with the first quick plug 10. After the second quick plug 11 is pulled out from the first quick plug 10, the first quick plug 10 can close the interface, that is, the first quick plug 10 can be a plug with an automatic interface closing function such as a self-sealing quick plug, a self-closing quick connector, a liquid (gas) sealing quick plug, etc. in the prior art, so that after the second quick plug 11 is pulled out from the first quick plug 10, the clamping claw cylinder 8 can be maintained in an open or closed or retracted state. Through the quick plug-in and pull-out of the first quick plug 10 and the second quick plug 11, the clamping action of the clamping claw cylinder 8 on the shaft 201 to be detected can be controlled. At the same time, after controlling the action of the gripper cylinder 8, the second quick plug 11 can be pulled out from the first quick plug 10, so that when the gripper cylinder 8 rotates, the pipeline for air supply will not be affected.

[0025] Furthermore, in order to enable the first quick plug 10 and the second quick plug 11 to be quickly connected to each other, so as to meet the requirements of controlling the clamping cylinder 8 to complete the corresponding action, as shown in FIG. Figure 5 As shown, the second quick plug 11 is arranged on the slide 12, and the slide 12 can be slidably connected to the gantry 14 arranged around the outer periphery of the socket 9 through the first linear guide 13. The first linear guide 13 is slidably connected with a positioning base 15, and the positioning base 15 is provided with a positioning pin 16 that can be plugged with the socket 9. When the positioning pin 16 is plugged with the socket 9, the socket 9 can be prevented from rotating, and the first quick plug 10 and the second quick plug 11 can be provided with a positioning. At the same time, the positioning base 15 or the slide 12 is provided with a first driving unit 17 that can drive the positioning pin 16 and the second quick plug 11 to move toward the socket 9. In order to prevent the slide 12 or the positioning base 15 from being out of the travel range of the first linear guide 13, the gantry bracket can be arranged on the transfer platform 1 in the vertical direction, the first linear guide 13 is arranged in the vertical direction, and the slide 12 and the positioning base 15 can slide in the vertical direction, the lower part of the positioning base 15 can be against the transfer platform 1, and the upper part of the positioning base 15 can be against the limit block arranged on the gantry 14, and the position of the limit block is located in the same horizontal plane as the position of the axis to be detected 201. And the travel range of the first drive unit 17 is less than the travel range of the first linear guide 13, and greater than half of the travel of the first linear guide 13.

[0026] Furthermore, in order to enable the socket 9 to be accurately plugged into the positioning pin 16, as Figure 3As shown, a slot-type positioning part 501 is provided on the positioning shaft 5, and the slot-type positioning part 501 is annularly arranged coaxially with the positioning shaft 5, and its outer edge is provided with a strip-shaped notch that coincides with the straight line where its radius is located, and a photoelectric sensor 18 that can correspond to the slot-type positioning part 501 is provided on the transfer platform 1. The photoelectric sensor 18 is in the prior art and can detect the position of the strip-shaped notch. When the positioning shaft 5 rotates to the position where the photoelectric sensor 18 can detect the strip-shaped notch, the photoelectric sensor 18 can feedback a signal to the drive module to make the drive module stop urgently. At this time, the socket 9 can be precisely docked with the positioning pin 16. At the same time, in this state, one of the clamping claws on the clamping claw cylinder 8 can correspond to the laser sensor arranged on the transfer platform 1, and the laser sensor can judge the opening and closing state of the clamping claw cylinder 8 by the position of the clamping claw, and when the clamping claw cylinder 8 is in a closed state, the laser sensor can feedback a signal to the second drive unit 25 to prevent the clamping claw cylinder 8 in this state from moving toward the axis 201 to be detected, prevent collision, and improve safety.

[0027] In this embodiment, if Figure 3 As shown, the positioning shaft 5 is sleeved with an annular counterweight 19, which has uniform density and is coaxially arranged with the positioning shaft 5. When the annular counterweight 19 rotates synchronously with the positioning shaft 5, the dynamic balance of the entire structure can be effectively adjusted.

[0028] At the same time, if Figure 1 As shown, the drive module includes a servo motor 20 and a reducer 21 arranged at the output end of the servo motor 20 to improve the stability of the output. At the same time, the output end of the reducer 21 is provided with a torque limiter 22 that is transmission-connected to the torque angle sensor 7. The torque limiter 22 can protect the torque angle sensor 7 from damage when the system is overloaded. If the range of the torque limiter 22 is set to 0.5N·m, the torque of the automobile steering gear 2 to be measured with abnormal rotation will be greater than 0.5N·m, which will cause the torque angle sensor 7 to be damaged. After the torque limiter 22 is added, if the torque test result of the steering gear exceeds 0.5N·m, it will automatically trip. After the trip, there is almost no torque transmission, so the torque angle sensor 7 can be effectively protected.

[0029] In the present technical solution, the first drive unit 17 and the second drive unit 25 are actuators in the prior art that can provide kinetic energy for linear motion, such as a cylinder, a silk slide, a lead screw slide, etc. Embodiment 2

[0030] like Figure 1-Figure 6As shown, the positioning fixture 28 is overlapped on the mounting plate 26 through a group of relatively arranged support plates 27, and the positioning fixture 28 is detachably connected to the support plate 27 through bolts 29 and quick-change positioning pins 30. The quick-change positioning pins 30 can facilitate the determination of the position of the positioning fixture 28 on the support plate 27, and the bolts 29 pass through the positioning fixture 28 and can be threadedly connected with the support plate 27, so as to facilitate the fixing of the positioning fixture 28 on the support plate 27. Through the bolts 29 and the quick-change positioning pins 30, the quick positioning pins 30 are prior art, which can quickly locate the position of the positioning fixture 28 installed on the support plate 27, thereby realizing the rapid disassembly and replacement of different positioning fixtures 28, so as to increase the flexibility of the test device.

[0031] As mentioned above, the positioning tool 28 includes a tooling plate that can be connected to the support plate 27 by bolts 29, and a plurality of contoured positioning seats that can support the automobile steering gear 2 are arranged on the tooling plate. The automobile steering gear 2 can be embedded in the contoured positioning seats, and a rotating clamping cylinder that can press down on the automobile steering gear 2 is arranged on the tooling plate to fully fix the position of the automobile steering gear 2 on the contoured positioning seat to ensure that when the torque test is performed, the other parts of the automobile steering gear 2 except the shaft 201 to be tested remain relatively still.

[0032] Furthermore, the horizontal workbench 24 and the mounting plate 28 in the present technical solution can be installed on a frame, and auxiliary equipment such as safety gratings, emergency stop buttons, displays, computers, etc. can be set on the frame to facilitate the operator to observe the torque test situation in real time and increase the safety of the operator's working environment.

[0033] Working principle: First, place the automobile steering gear 2 on the positioning fixture 28, and fix the position of the automobile steering gear 2 by the positioning fixture 28. At this time, the barcode scanner 31 can identify and mark the code of the automobile steering gear 2. Subsequently, the servo motor 20 drives the clamping cylinder 8 to rotate, and stops after the groove-type positioning part 501 rotates to a certain angle. At this time, the positioning pin 16 on the positioning base 15 can be plugged into the socket 9. Subsequently, after confirming that the clamping cylinder 8 is in an open state, the transfer platform 1 is driven by the second driving unit 25 to move toward the positioning fixture 28, so that the clamping cylinder 8 is covered on the shaft 201 to be detected of the automobile steering gear 2. Then, the first driving unit 17 drives the positioning base 15 and the slide 12 to approach the socket 9, so that the second quick plug 11 is docked with the first quick plug 10, even if the jaw cylinder 8 is connected to the air source, thereby controlling the jaw cylinder 8 to clamp the shaft 201 to be detected. After the jaw cylinder 8 completes the action of clamping the shaft 201 to be detected, the first driving unit 17 drives the positioning base 15 and the slide 12 away from the socket 9. After the second quick plug 11, the positioning pin 16 and other components do not affect the rotation of the socket 9 and the jaw cylinder 8, the servo motor 20 drives the jaw cylinder 8 to rotate at a uniform speed in the forward or reverse direction. At this time, the torque angle sensor 7 can record the torque and angle during the measurement process in real time. The data after the test can be bound to the code recognized by the barcode scanner 31 and stored centrally. Subsequently, repeat the above actions, and after the second quick plug 11 is docked with the first quick plug 10, control the clamping cylinder 8 to release the shaft 201 to be detected, and the second driving unit 25 drives the transfer platform 1 away from the tooling to be positioned 28, and removes the automobile steering gear 2 on the positioning tooling 28, and waits for the next detection operation.

[0034] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A fully automatic torque testing device for automobile steering gear, characterized in that: It comprises a positioning tool (28) and a transfer platform (1) capable of horizontally moving toward the positioning tool (28); The automobile steering gear (2) can be fixed on the positioning fixture (28), and the shaft to be tested (201) on the automobile steering gear (2) can be directed toward the transfer platform (1); a rotating fixture capable of clamping the shaft to be tested (201) is provided on the transfer platform (1); The rotating fixture is connected to the air bearing (4) through a universal coupling (3); the air bearing (4) can be connected to the flexible coupling (6) through a positioning shaft (5); the flexible coupling (6) is connected to the torque angle sensor (7); and the transfer platform (1) is provided with a driving module capable of driving the rotating fixture to drive the shaft (201) to rotate through the torque angle sensor (7), the flexible coupling (6), the positioning shaft (5), the air bearing (4) and the universal coupling (3).

2. The fully automatic torque testing device for automobile steering gear according to claim 1 is characterized in that: The rotary clamp comprises a clamping claw cylinder (8) capable of clamping the shaft (201) to be tested, the clamping claw cylinder (8) being capable of being connected to an air source via a socket (9), a first quick plug (10) being provided on the socket (9), and a second quick plug (11) being capable of moving toward the socket (9) and being plugged into and mated with the first quick plug (10) being provided on the transfer platform (1); Wherein, after the second quick plug (11) is pulled out from the first quick plug (10), the first quick plug (10) can close the interface.

3. The fully automatic torque testing device for automobile steering gear according to claim 2 is characterized in that: The second quick plug (11) is arranged on a slide (12), and the slide (12) can be slidably connected to a gantry (14) arranged around the outer periphery of the socket (9) through a first linear guide rail (13). A positioning base (15) is slidably connected to the first linear guide rail (13), and a positioning pin (16) capable of plugging and cooperating with the socket (9) is arranged on the positioning base (15), and a first driving unit (17) capable of driving the positioning pin (16) and the second quick plug (11) to move toward the socket (9) is arranged on the positioning base (15) or the slide (12).

4. The fully automatic torque testing device for automobile steering gear according to claim 1 is characterized in that: A groove-shaped positioning portion (501) is provided on the positioning shaft (5), and a photoelectric sensor (18) that can correspond to the groove-shaped positioning portion (501) is provided on the transfer platform (1).

5. The fully automatic torque testing device for automobile steering gear according to claim 1 is characterized in that: The positioning shaft (5) is sleeved with an annular counterweight (19).

6. The fully automatic torque testing device for automobile steering gear according to claim 1 is characterized in that: The drive module comprises a servo motor (20) and a reducer (21) arranged at the output end of the servo motor (20), and the output end of the reducer (21) is provided with a torque limiter (22) transmission-connected to the torque angle sensor (7).

7. The fully automatic torque testing device for automobile steering gear according to claim 1 is characterized in that: The transfer platform (1) can be slidably connected to a horizontal workbench (24) via a second linear guide rail (23), and a second driving unit (25) capable of driving the transfer platform (1) to move is provided on the horizontal workbench (24).

8. The fully automatic torque testing device for automobile steering gear according to claim 1 is characterized in that: The positioning fixture (28) is overlapped on the mounting plate (26) via a set of relatively arranged support plates (27), and the positioning fixture (28) is detachably connected to the support plate (27) via bolts (29) and quick-change positioning pins (30).

9. The fully automatic torque testing device for automobile steering gear according to claim 1, characterized in that: It also includes a code scanner (31) capable of identifying the code of the automobile steering gear (2), and the code scanner (31) is electrically connected to the torque angle sensor (7).

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