A traction arm assembly device and assembly method

Abstract

This invention discloses a tow arm assembly device and method, relating to the field of automotive rear suspension tow arms. It includes a control cabinet module with a base plate on it, and an operation switch button on the base plate. A control circuit is installed within the control cabinet module, and the operation switch button is electrically connected to the control circuit. A tow arm tooling module is mounted on the base plate. A column module is also mounted on the base plate, and a tightening machine is mounted on the column module. The tightening machine is electrically connected to the control circuit and its operation is controlled by the operation switch button. A frame module covers the column module and the tow arm tooling module. A working air pressure output module is located within the control cabinet module, providing working air pressure to the column module and the tow arm tooling module. This invention solves the problem of unstable torque during manual tightening, avoiding the risk of insufficient or out-of-tolerance bolt torque. Simultaneously, it reduces worker labor intensity, improves production efficiency, achieves torque traceability, and enhances the safety of production operations.

Description

Technical Field

[0001] This invention relates to the field of automobile rear suspension drawbars, and more specifically to a drawbar assembly device and assembly method. Background Technology

[0002] The rear suspension drawbar is mostly used in multi-link rear suspensions. One end of the drawbar is a bushing, and the other end is a U-shaped fork structure. The bushing end is connected to the drawbar bracket and fixed to the bottom of the vehicle body, while the U-shaped fork end is connected to the rear steering knuckle. During vehicle operation, the steering knuckle force is transmitted to the chassis through the drawbar assembly, providing traction and braking force.

[0003] like Figure 1 As shown, the assembly structure of the traction arm assembly module 500 is as follows: After the bushing 504 of the traction arm 60 is inserted into the center hole of the traction arm bracket 61, the two parts are fixedly connected using bolts 68 and nuts 67. The U-shaped fork 503 of the traction arm 60 is fixedly connected to the steering knuckle through the steering knuckle mounting hole 501, and fixing holes 502 are opened at the four corners of the traction arm bracket to fix it to the vehicle body.

[0004] The assembly of the drawbar and drawbar bracket involves angular and positional relationships to ensure that the assembled module meets the vehicle's assembly position. After the parts are positioned by the tooling, bolts are tightened. The existing assembly technology involves manually pre-tightening the bolts and then using a torque wrench to tighten them to the set torque value, completing the entire process. However, this existing technology has the following drawbacks:

[0005] 1. Manually pre-tighten the torque, and then use a torque wrench to tighten the bolt to the set torque value. The assembly cycle of a single piece is about 45 seconds, which is low in production efficiency and cannot meet the production needs of the workshop.

[0006] 2. The operator's workload is high, which is not in line with ergonomics;

[0007] 3. Manual tightening torque is unstable, which may lead to the bolt torque being too low or out of tolerance;

[0008] 4. Manual operation poses safety hazards. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a traction arm assembly device and method that solves the problem of unstable torque during manual tightening, avoiding the risk of insufficient or out-of-tolerance bolt torque. Simultaneously, it reduces worker workload, improves production efficiency, achieves torque tracking, and enhances the safety of production operations.

[0010] The objective of this invention is achieved through the following technical solution: a traction arm assembly device, wherein one end of the traction arm is provided with a U-shaped fork for connecting to the rear steering knuckle of a vehicle, and the other end of the traction arm is provided with a bushing for connecting to a traction arm bracket, the bushing being fixedly connected to the traction arm bracket by nuts and bolts, the device comprising:

[0011] A control cabinet module is provided with a base plate, and an operation switch button is provided on the base plate. A control circuit is provided inside the control cabinet module, and the operation switch button is electrically connected to the control circuit.

[0012] The traction arm tooling module is mounted on the base plate and electrically controlled by the control circuit. This traction arm tooling module is used to position and clamp the traction arm.

[0013] The column module is installed on the base plate. A tightening machine is installed on the column module to tighten the bolts between the bushing and the traction arm bracket. The tightening machine is electrically connected to the control circuit and its operation is controlled by the operation switch button.

[0014] The frame module is fitted around the column module and the traction arm tooling module, and is fixed to the base plate; and

[0015] The working air pressure output module is located inside the control cabinet module and provides working air pressure to the column module and the traction arm tooling module.

[0016] As a further technical solution, the traction arm tooling module includes a tooling base plate fixed to a base plate. A traction arm angle positioning seat and a support module are fixed on the tooling base plate. The U-shaped fork of the traction arm is positioned on the tooling base plate by the traction arm angle positioning seat. A left clamping cylinder and a right clamping cylinder are respectively provided on both sides of the support module. A traction arm bracket positioning plate is provided on the support module between the two cylinders for positioning and installing the traction arm bracket. The traction arm bracket is clamped or released by the two cylinders. A first cylinder is installed on the support module through a first cylinder fixing plate. A nut mounting seat for placing the nut is located directly below the bolt. The output end of the first cylinder is connected to drive the nut mounting seat, so that the nut moves up and down along the axial direction of the bolt.

[0017] As a further technical solution, the column module includes columns arranged perpendicular to the base plate. The top of the columns is assembled with crossbeams to form a rectangular frame structure. Linear guide rails are arranged on the surface of the frame structure perpendicular to the base plate. A tightening machine mounting base equipped with a tightening machine is slidably mounted on the linear guide rails via a linear guide rail slide. The tightening machine drives the tightening head to rotate via a tightening rod. The tightening head is located directly above the bolt. A second cylinder is mounted on the inner side of the column via a cylinder mounting base. The output end of the second cylinder is connected to the tightening machine mounting base via a hinge support, thereby controlling the lifting and lowering movement of the tightening head relative to the bolt.

[0018] As a further technical solution, the left clamping cylinder, the right clamping cylinder, and the first cylinder are all controlled by a cylinder control valve, and the second cylinder is servo controlled by a cylinder servo control valve. Both the cylinder control valve and the cylinder servo control valve are provided with working air pressure by a working air pressure output module, and the cylinder servo control valve is provided with a servo signal by an operation switch button.

[0019] As a further technical solution, a parts inlet / outlet is provided on the frame module near the traction arm tooling module for inserting or removing the traction arm. A cylinder control valve, located on the tooling base plate, is arranged inside the parts inlet / outlet, and an operation switch button is arranged outside the parts inlet / outlet. A grating is installed on the frame module on both sides of the parts inlet / outlet, and the grating is electrically connected to the control circuit. The frame module is also equipped with a control panel and a display screen. The control panel is electrically connected to the control circuit and is used to set the working parameters of the tightening machine. The display screen is electrically connected to the control circuit and is used to display the torque parameters of the bolts after the traction arm is assembled. An external warning light is connected to the display screen, and the warning light automatically alarms based on the bolt torque parameters.

[0020] As a further technical solution, the base plate has positioning holes for the traction arm tooling module, which are used to position the traction arm tooling module on the control cabinet module in conjunction with the corresponding tooling positioning holes on the base plate. The column module is fixed to the base plate through the column module positioning holes on the base plate, and the frame module is fixed to the base plate through the frame module positioning holes on the base plate. The base plate also has wiring harness through holes for the wiring harness inside the control cabinet module to pass through. A power switch and a heat sink are provided on the side of the control cabinet module. The power switch is used to control the power on and off of the control circuit, and the heat sink is used to dissipate heat inside the control cabinet module.

[0021] As a further technical solution, the traction arm angle positioning seat is positioned by the traction arm positioning pin and the steering knuckle mounting hole of the U-shaped fork. The traction arm angle positioning seat includes a left traction arm angle positioning seat located on the left side of the tooling base plate and a right traction arm angle positioning seat located on the right side of the tooling base plate. A left clamping cylinder seat is provided on the left side of the support module for installing the left clamping cylinder, and a right clamping cylinder seat is provided on the right side of the support module for installing the right clamping cylinder. The traction arm bracket positioning plate is provided with bracket positioning pins, traction arm bracket positioning pin one 55 and traction arm bracket positioning pin two 56, for positioning the fixing holes of the traction arm bracket. The tooling base plate is also provided with tooling lifting lugs to facilitate the hoisting of the traction arm tooling module.

[0022] As a further technical solution, the wire guide rail is mounted on the frame structure via a wire guide rail fixing plate. The bottom of the column is fixed to the base plate via a column fixing seat. The second cylinder is fixed to the base plate via a cylinder fixing seat. A wire harness protective chain is mounted on the side of the column via a wire harness protective chain seat. The wire harness protective chain slides up and down with the tightening machine to protect the connecting cable of the tightening machine. A limiting rubber and a buffer seat bracket are provided on the wire guide rail fixing plate at the lower end of the wire guide rail. The limiting rubber is used to limit the downward sliding stroke of the wire guide rail slide. A buffer seat is mounted on the buffer seat bracket to buffer and stop the tightening machine fixing seat.

[0023] The assembly method using the above-mentioned traction arm assembly equipment includes the following steps:

[0024] Step 1: Rotate the cylinder control valve to control the left clamping cylinder seat and the right clamping cylinder to release, while the first cylinder drives the nut mounting seat to move downward;

[0025] Step 2: First, install the nut into the nut mounting seat through the parts inlet and outlet, and then position the traction arm bracket on the traction arm bracket positioning plate using the bracket positioning pin.

[0026] Step 3: Rotate the cylinder control valve to control the left clamping cylinder seat and the right clamping cylinder to clamp the traction arm bracket. At the same time, the first cylinder drives the nut mounting seat to move upward to below the traction arm bracket.

[0027] Step 4: Insert the bushing of the traction arm into the center hole of the traction arm bracket through the parts inlet and outlet. Use bolts to pass through the traction arm bracket and the traction arm. At the same time, put the U-shaped fork of the traction arm into the traction arm angle positioning seat and position the U-shaped fork with the help of the traction arm positioning pin.

[0028] Step 5: Move away from the part inlet and outlet, press the operation switch button to move the tightening machine downwards to above the bolt and gradually tighten the bolt. When the bolt reaches the set torque value, the tightening machine slides upwards back to its original position.

[0029] Step Six: Rotate the cylinder control valve to control the left clamping cylinder seat and the right clamping cylinder to release the traction arm bracket. At the same time, the first cylinder drives the nut mounting seat to move downwards back to its original position. Take out the assembled traction arm assembly module to complete one assembly operation.

[0030] As a further technical solution, before the start of the first step, an inspection operation is performed on the traction arm assembly equipment: turn on the power switch, observe whether the page display on the screen is normal, check whether the indicator lights on the control panel are normal, whether the switch on the control panel is set to the initial position, whether the radiator is operating normally, and check the airtightness of the working air pressure output module; after the tightening machine slides upward back to its original position in step five, observe the color of the warning light, and after taking out the assembled traction arm assembly module in step six, mark whether the torque value of the traction arm assembly module is qualified.

[0031] The beneficial effects of this invention are as follows:

[0032] 1. Use a tightening machine to automatically tighten the bolts, replacing manual tightening and ensuring consistent tightening torque.

[0033] 2. The positioning of the traction arm and traction arm bracket is achieved by using the traction arm angle positioning seat and traction arm bracket positioning plate, which ensures the assembly accuracy.

[0034] 3. The left and right clamping cylinders, as well as the first and second cylinders, are all supplied with working air pressure through the working air pressure output module, which integrates the entire air circuit control system and realizes servo control through cylinder control valves and operation switch buttons, which is safe and efficient.

[0035] 4. The frame module is equipped with a display screen that can display the torque parameters of the traction arm bolts in real time after assembly, and automatically alarm with the help of warning lights. The torque value of the traction arm assembly module is displayed more intuitively and torque traceability can be realized. The control panel can adjust the working parameters of the tightening machine according to production needs. The grating can prevent the operator's hands from entering the work area during the operation of the equipment, which may cause safety accidents.

[0036] 5. The tooling base plate is equipped with both left and right traction arm angle positioning seats, which can accommodate both left and right traction arms, making the equipment more versatile.

[0037] 6. Limiting rubber and buffer seat are set at the lower end of the guide rail to provide a buffering effect and prevent the traction arm from being damaged by bumps during assembly;

[0038] 7. Actual production testing showed that the assembly cycle time for a single piece was reduced from 45 seconds to 24 seconds, which helps to reduce the intensity of manual labor and improve production efficiency. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the assembly structure of the traction arm assembly module in this invention.

[0040] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0041] Figure 3 This is a schematic diagram of the control cabinet module in this invention.

[0042] Figure 4 This is a schematic diagram of the framework module in this invention.

[0043] Figure 5 This is a structural schematic diagram of the column module in this invention.

[0044] Figure 6 This is a schematic diagram of the traction arm tooling module in the present invention. Figure 1 .

[0045] Figure 7 This is a schematic diagram of the traction arm tooling module in the present invention. Figure 2 .

[0046] Figure 8 This is a schematic diagram of the gas path control system and the circuit control system in this invention.

[0047] Explanation of reference numerals in the attached diagram: Base plate 1, Light grid 2, Warning light 3, Control panel 4, Display screen 5, Operation switch button 6, Power switch 7, Radiator 8, Traction arm tooling module positioning hole 11, Column module positioning hole 12, Frame module positioning hole 13, Wire harness through hole 14, Tightening machine 31, Hinge support 32, Tightening machine fixing seat 33, Buffer seat 34, Buffer seat bracket 35, Limiting adhesive 36, Tightening rod 37, Tightening head 38, Second cylinder 39, Cylinder fixing seat 40, Column fixing seat 41, Wire harness protective chain seat 42, Wire harness protective chain 43, Column 44, Crossbeam 45, Wire guide rail fixing plate 46, Wire guide rail 47, Wire guide rail slide 48, Tooling base plate 51, Tooling lifting lug 52, Right clamping cylinder seat 53, Right clamping cylinder 54, Traction arm bracket positioning pin 1 55. 56. Traction arm bracket positioning pin 2; 57. Traction arm bracket positioning plate; 58. Left clamping cylinder seat; 59. Left clamping cylinder; 60. Traction arm; 61. Traction arm bracket; 62. Traction arm positioning pin; 63. Left traction arm angle positioning seat; 64. Right traction arm angle positioning seat; 65. Nut mounting seat; 66. Cylinder control valve; 67. Nut; 68. Bolt; 69. First cylinder; 70. Tooling positioning hole; 71. First cylinder fixing plate; 80. Support module; 81. Cylinder servo control valve; 90. Gas regulating valve; 100. Control cabinet module; 200. Frame module; 201. Parts inlet / outlet; 300. Column module; 400. Traction arm tooling module; 500. Traction arm assembly module; 501. Steering knuckle mounting hole; 502. Fixing hole; 503. U-shaped fork; 504. Bushing; 600. Working air pressure output module. Detailed Implementation

[0048] The present invention will now be described in detail with reference to the accompanying drawings:

[0049] Example: As attached Figures 1-8As shown, this traction arm assembly equipment includes a base plate 1, a light grid 2, a warning light 3, a control panel 4, a display screen 5, an operation switch button 6, a power switch 7, a radiator 8, traction arm tooling module positioning holes 11, column module positioning holes 12, frame module positioning holes 13, wire harness through holes 14, a tightening machine 31, a hinge support 32, a tightening machine fixing seat 33, a buffer seat 34, a buffer seat bracket 35, a limiting adhesive 36, a tightening rod 37, a tightening head 38, a second cylinder 39, a cylinder fixing seat 40, a column fixing seat 41, a wire harness protective chain seat 42, a wire harness protective chain 43, a column 44, a crossbeam 45, a wire guide rail fixing plate 46, a wire guide rail 47, a wire guide rail slide 48, a tooling base plate 51, a tooling lifting lug 52, a right clamping cylinder seat 53, a right clamping cylinder 54, and a traction arm bracket positioning pin. 55. Traction arm bracket positioning pin; 56. Traction arm bracket positioning plate; 57. Left clamping cylinder seat; 58. Left clamping cylinder; 59. Traction arm; 60. Traction arm bracket; 61. Traction arm positioning pin; 62. Left traction arm angle positioning seat; 63. Right traction arm angle positioning seat; 64. Nut mounting seat; 65. Cylinder control valve; 66. Nut; 67. Bolt; 68. First cylinder; 69. Tooling positioning hole; 70. First cylinder fixing plate; 71. Support module; 80. Cylinder servo control valve; 81. Gas regulating valve; 90. Control cabinet module; 100. Frame module; 200. Parts inlet / outlet; 201. Column module; 300. Traction arm tooling module; 400. Traction arm assembly module; 500. Steering knuckle mounting hole; 501. Fixing hole; 502. U-shaped fork; 503. Bushing; 504. Working air pressure output module; 600.

[0050] Reference Appendix Figure 1 One end of the traction arm 60 is provided with a U-shaped fork 503 for connecting to the rear steering knuckle of the vehicle, and the other end of the traction arm 60 is provided with a bushing 504 for connecting to the traction arm bracket 61. The bushing 504 is fixedly connected to the traction arm bracket 61 by a nut 67 and a bolt 68.

[0051] like Figure 2 , 3As shown, a base plate 1 is provided on the control cabinet module 100, and an operation switch button 6 is provided on the base plate 1. A control circuit is provided inside the control cabinet module 100, and the operation switch button 6 is electrically connected to the control circuit. A traction arm tooling module positioning hole 11 is provided on the base plate 1 to cooperate with the tooling positioning hole 70 at the corresponding position on the tooling base plate 51 to position the traction arm tooling module 400 on the control cabinet module 100. The column module 300 is fixed to the base plate 1 by the column module positioning hole 12 on the base plate 1, and the frame module 200 is fixed to the base plate 1 by the frame module positioning hole 13 on the base plate 1. A wire harness through hole 14 is also provided on the base plate 1, through which the wire harness inside the control cabinet module 100 passes out. A power switch 7 and a heat sink 8 are provided on the left side of the control cabinet module 100. The power switch 7 can control the power on and off of the control circuit, and the heat sink 8 provides heat dissipation for the inside of the control cabinet module 100.

[0052] Reference Appendix Figure 6 , 7 The traction arm tooling module 400 is mounted on the base plate 1 and electrically controlled by the control circuit. The traction arm tooling module 400 includes a tooling base plate 51 mounted on the base plate 1. A traction arm angle positioning seat (preferably including a left traction arm angle positioning seat 63 on the left side of the tooling base plate 51 and a right traction arm angle positioning seat 64 on the right side of the tooling base plate 51) and a support module 80 are fixed on the tooling base plate 51. The U-shaped fork 503 of the traction arm 60 is positioned on the tooling base plate 51 by the traction arm angle positioning seat and the traction arm positioning pin 62. This is applicable to both left and right types of traction arms 60. A left clamping cylinder seat 58 is provided on the left side of the support module 80 to install a left clamping cylinder 59, and a right clamping cylinder seat 53 is provided on the right side of the support module 80 to install a right clamping cylinder 54. A traction arm bracket positioning plate 57 is provided on the support module 80 between the two cylinders. The traction arm bracket positioning plate 57 has a first traction arm bracket positioning pin 55 and a second traction arm bracket positioning pin 56, facilitating the positioning of the fixing hole 502 of the traction arm bracket 61. The traction arm bracket 61 is clamped or released by the two cylinders. A first cylinder 69 is mounted on the support module 80 via a first cylinder fixing plate 71. A nut mounting seat 65 is located directly below the bolt 68. Preferably, the nut mounting seat 65 has a hexagonal groove for easy insertion of the nut 67. The output end (piston rod) of the first cylinder 69 drives the nut mounting seat 65, causing the nut 67 to move up and down along the axial direction of the bolt 68. Preferably, a tooling lifting lug 52 is also provided on the tooling base plate 51 for easy lifting of the traction arm tooling module 400.

[0053] like Figure 5As shown, the column module 300 is installed on the base plate 1. The column module 300 includes two columns 44 arranged perpendicular to the base plate 1. The tops of the two columns 44 are assembled by crossbeams 45 to form a rectangular frame structure. A guide rail fixing plate 46 is installed on the surface of the frame structure. A guide rail 47 is arranged on the guide rail fixing plate 46 perpendicular to the base plate 1. A tightening machine fixing seat 33 is slidably mounted on the guide rail 47 via a guide rail slide 48. The tightening machine 31 is vertically mounted on the tightening machine fixing seat 33. The tightening machine 31 drives the tightening head 38 to rotate through the tightening rod 37. The tightening head 38 is located directly above the bolt 68 and is a sleeve type that can cooperate with the bolt 68 to tighten the bolt 68. A second cylinder 39 is installed inside the two columns 44 via a cylinder mounting base 40. The output end (piston rod) of the second cylinder 39 is connected to and drives the tightening machine mounting base 33 via a hinge support 32, thereby controlling the lifting and lowering movement of the tightening head 38 relative to the bolt 68. Preferably, the bottom of the column 44 is fixed to the base plate 1 via a column mounting base 41, and the second cylinder 39 is fixed to the base plate 1 via a cylinder mounting base 40. A wire harness protective chain 43 is installed on the side of the column 44 via a wire harness protective chain seat 42. The wire harness protective chain 43 slides up and down with the tightening machine 31 to protect the connecting cable of the tightening machine 31. A limiting rubber 36 and a buffer seat bracket 35 are provided on the wire guide rail fixing plate 46 at the lower end of the wire guide rail 47. The limiting rubber 36 is located at the end of the wire guide rail 47 and can limit the downward sliding stroke of the wire guide rail slide 48. The buffer seat bracket 35 is equipped with a buffer seat 34. When the tightening machine fixing seat 33 slides down and contacts the buffer seat 34, the buffer seat 34 plays a role in buffering and blocking, preventing the downward impact force of the tightening head 38 from hitting the bolt 68 and causing damage to the assembled parts.

[0054] Reference Appendix Figure 8 The left clamping cylinder 59, the right clamping cylinder 54, and the first cylinder 69 are all controlled by the cylinder control valve 66. The second cylinder 39 is connected to the gas regulating valve 90 and is then servo-controlled by the cylinder servo control valve 81. Both the cylinder control valve 66 and the cylinder servo control valve 81 are supplied with working air pressure by the working air pressure output module 600 (located in the control cabinet module 100). The cylinder servo control valve 81 is provided with a servo signal by the operation switch button 6. The tightening machine 31 is electrically connected to the control circuit of the control cabinet module 100 and is controlled by the operation switch button 6.

[0055] like Figure 2 , 4As shown, a frame module 200 fixed on the base plate 1 covers the outer periphery of the column module 300 and the traction arm tooling module 400. A parts inlet / outlet 201 is provided near the traction arm tooling module 400 (tooling base plate 51), facilitating the operator to place or remove parts into or from the traction arm tooling module 400. Preferably, a cylinder control valve 66, located on the tooling base plate 51, is positioned inside the parts inlet / outlet 201, while an operation switch button 6 is positioned outside. Light gratings 2 are installed on the frame modules 200 on both sides of the parts inlet / outlet 201, and these light gratings are electrically connected to the control circuit. When the operator picks up or places parts, their arm will block the light grating 2, at which point the light grating 2 sends a signal to the control circuit, stopping the tightening machine 31 and other equipment to prevent injury to the operator. Furthermore, the frame module 200 is equipped with a control panel 4 and a display screen 5. The control panel 4 is electrically connected to the control circuit (control cabinet module 100). The control panel 4 can set the working parameters of the tightening machine 31 (such as torque value, torque rotation angle, etc.), and is also equipped with an emergency stop switch, a reset button, a tightening force forward / reverse button, and an indicator light switch for easy adjustment according to production needs. The display screen 5 is also electrically connected to the control circuit (control cabinet module 100). With the help of the torque sensor on the tightening machine 31, the display screen 5 can display the torque parameters of the bolt 68 after the traction arm 60 is assembled (such as torque value, nut rotation angle, etc.), realizing accurate traceability of the torque of each part. In addition, the display screen 5 is externally connected to a warning light 3. The warning light 3 automatically determines whether the torque of the product after assembly is qualified based on the torque parameters of the bolt 68, and realizes automatic alarm.

[0056] The assembly method using the above-mentioned traction arm assembly equipment includes the following steps:

[0057] Before assembly production begins, preparatory steps are performed, including checking the traction arm assembly equipment: turn on the power switch 7, observe whether the page display on the screen 5 is normal, check whether the indicator lights on the control panel 4 are normal, check whether the switches on the control panel 4 are set to the initial position, check whether the radiator 8 is operating normally, and check the airtightness of the working air pressure output module 600. After all the above checks are qualified, assembly production begins, proceeding to step one.

[0058] Step 1: Rotate the cylinder control valve 66 to control the left clamping cylinder seat 58 and the right clamping cylinder 54 to loosen, while the first cylinder 69 drives the nut mounting seat 65 to move downward.

[0059] Step 2: First, install the nut 67 into the nut mounting base 65 through the parts inlet / outlet 201, and then position the traction arm bracket 61 on the traction arm bracket positioning plate 57 through the bracket positioning pin.

[0060] Step 3: Rotate the cylinder control valve 66 to control the left clamping cylinder seat 58 and the right clamping cylinder 54 to clamp the traction arm bracket 61. At the same time, the first cylinder 69 drives the nut mounting seat 65 to move upward to below the traction arm bracket 61.

[0061] Step 4: Insert the bushing 504 of the traction arm 60 into the center hole of the traction arm bracket 61 through the parts inlet / outlet 201, and use bolts 68 to pass through the traction arm bracket 61 and the traction arm 60. At the same time, put the U-shaped fork 503 of the traction arm 60 into the traction arm angle positioning seat, and use the traction arm positioning pin 62 to position the U-shaped fork 503.

[0062] Step 5: The operator (arm) moves away from the part inlet / outlet 201, presses the operation switch button 6, and moves the tightening machine 31 downward to above the bolt 68 and gradually tightens the bolt 68. When the bolt 68 reaches the set torque value, the tightening machine 31 slides upward back to its original position. Then, observe the color indicated by the warning light 3.

[0063] Step Six: Rotate the cylinder control valve 66 to control the left clamping cylinder seat 58 and the right clamping cylinder 54 to release the traction arm bracket 61. At the same time, the first cylinder 69 drives the nut mounting seat 65 to move downwards back to its original position. Take out the assembled traction arm assembly module 500 and mark whether the torque value of the traction arm assembly module 500 is qualified according to the color indicated by the warning light 3. A green warning light 3 indicates that the torque value is qualified, and a red warning light 3 indicates that the torque value is unqualified. This completes one assembly operation.

[0064] This invention eliminates the need for manual tightening of the traction arm, ensuring consistent bolt torque and avoiding the risk of insufficient or out-of-tolerance bolt torque. This reduces operator workload and improves production efficiency. Actual assembly tests show that the assembly time for a single traction arm has been reduced from 45 seconds to 24 seconds. Furthermore, the display screen shows the bolt torque parameters (such as torque value and nut rotation angle) after traction arm assembly, enabling precise traceability of the torque for each component.

[0065] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this invention should fall within the scope of protection of the appended claims.

Claims

1. A traction arm assembly device, wherein one end of the traction arm (60) is provided with a U-shaped fork (503) for connecting to the rear steering knuckle of a vehicle, and the other end of the traction arm (60) is provided with a bushing (504) for connecting to a traction arm bracket (61), the bushing (504) being fixedly connected to the traction arm bracket (61) by a nut (67) and a bolt (68), characterized in that: include: A control cabinet module (100) is provided with a base plate (1) and an operation switch button (6) is provided on the base plate (1). A control circuit is provided inside the control cabinet module (100), and the operation switch button (6) is electrically connected to the control circuit. The traction arm tooling module (400) is installed on the base plate (1) and is electrically controlled by the control circuit. The traction arm tooling module (400) is used to position and clamp the traction arm (60). The column module (300) is installed on the base plate (1). A tightening machine (31) is provided on the column module (300) for tightening the bolts (68) between the bushing (504) and the traction arm bracket (61). The tightening machine (31) is electrically connected to the control circuit and its operation is controlled by the operation switch button (6). The frame module (200) is covered on the outer periphery of the column module (300) and the traction arm tooling module (400), and the frame module (200) is fixed on the base plate (1); as well as The working air pressure output module (600) is located in the control cabinet module (100) and provides working air pressure to the column module (300) and the traction arm tooling module (400); The traction arm tooling module (400) includes a tooling base plate (51) fixed on a base plate (1). A traction arm angle positioning seat and a support module (80) are fixed on the tooling base plate (51). The U-shaped fork (503) of the traction arm (60) is positioned on the tooling base plate (51) by the traction arm angle positioning seat. A left clamping cylinder (59) and a right clamping cylinder (54) are respectively provided on both sides of the support module (80). The traction arm is set on the support module (80) between the two cylinders. The bracket positioning plate (57) is used to position and install the traction arm bracket (61). The traction arm bracket (61) is clamped or released by two cylinders. The first cylinder (69) is installed on the support module (80) through the first cylinder fixing plate (71). The nut mounting seat (65) for placing the nut (67) is located directly below the bolt (68). The output end of the first cylinder (69) is connected to drive the nut mounting seat (65) so that the nut (67) moves up and down along the axial direction of the bolt (68). The column module (300) includes columns (44) arranged in a direction perpendicular to the base plate (1). The top of the column (44) is assembled into a rectangular frame structure by crossbeams (45). Line guide rails (47) are arranged on the surface of the frame structure in a direction perpendicular to the base plate (1). The tightening machine fixing seat (33) equipped with a tightening machine (31) is slidably set on the line guide rail (47) through the line guide rail slide (48). The tightening machine (31) drives the tightening head (38) to rotate through the tightening rod (37). The tightening head (38) is located directly above the bolt (68). A second cylinder (39) is installed inside the column (44). The output end of the second cylinder (39) is connected to drive the tightening machine fixing seat (33), thereby controlling the tightening head (38) to move up and down relative to the bolt (68).

2. The traction arm assembly equipment according to claim 1, characterized in that: The left clamping cylinder (59), the right clamping cylinder (54) and the first cylinder (69) are all controlled by the cylinder control valve (66), and the second cylinder (39) is servo controlled by the cylinder servo control valve (81). The cylinder control valve (66) and the cylinder servo control valve (81) are both provided with working air pressure by the working air pressure output module (600), and the cylinder servo control valve (81) is provided with servo signal by the operation switch button (6).

3. The traction arm assembly equipment according to claim 2, characterized in that: The frame module (200) has a parts inlet / outlet (201) located near the traction arm tooling module (400). A cylinder control valve (66) is located on the tooling base plate (51) inside the parts inlet / outlet (201). An operation switch button (6) is located outside the parts inlet / outlet (201). A grating (2) is set on the frame module (200) on both sides of the parts inlet / outlet (201). The grating (2) is electrically connected to the control circuit. The frame module (200) is also equipped with a control panel (4) and a display screen (5). The control panel (4) is electrically connected to the control circuit and is used to set the working parameters of the tightening machine (31). The display screen (5) is electrically connected to the control circuit and is used to display the torque parameters of the bolts (68) after the traction arm (60) is assembled. The display screen (5) is externally connected to a warning light (3). The warning light (3) automatically alarms according to the torque parameters of the bolts (68).

4. The traction arm assembly equipment according to claim 3, characterized in that: The base plate (1) has a positioning hole (11) for the traction arm tooling module, which is used to cooperate with the tooling positioning hole (70) at the corresponding position on the tooling base plate (51) to position the traction arm tooling module (400) on the control cabinet module (100); the column module (300) is fixed on the base plate (1) through the column module positioning hole (12) on the base plate (1), and the frame module (200) is fixed on the base plate (1) through the frame module positioning hole (13) on the base plate (1); the base plate (1) also has a wire harness through hole (14) for the wire harness inside the control cabinet module (100) to pass through; the control cabinet module (100) has a power switch (7) and a heat sink (8) on its side. The power switch (7) is used to control the power on and off of the control circuit, and the heat sink (8) is used to dissipate heat inside the control cabinet module (100).

5. The traction arm assembly equipment according to claim 4, characterized in that: The traction arm angle positioning seat is positioned by the traction arm positioning pin (62) and the steering knuckle mounting hole (501) of the U-shaped fork (503). The traction arm angle positioning seat includes a left traction arm angle positioning seat (63) located on the left side of the tooling base plate (51) and a right traction arm angle positioning seat (64) located on the right side of the tooling base plate (51). A left clamping cylinder seat (58) is provided on the left side of the support module (80) for installing a left clamping cylinder (59), and a right clamping cylinder seat (53) is provided on the right side of the support module (80) for installing a right clamping cylinder (54). A bracket positioning pin is provided on the traction arm bracket positioning plate (57) for positioning the fixing hole (502) of the traction arm bracket (61). A tooling lifting lug (52) is also provided on the tooling base plate (51) to facilitate the hoisting of the traction arm tooling module (400).

6. The traction arm assembly equipment according to claim 5, characterized in that: The wire guide rail (47) is installed on the frame structure through the wire guide rail fixing plate (46). The bottom of the column (44) is fixed to the base plate (1) through the column fixing seat (41). The second cylinder (39) is fixed to the base plate (1) through the cylinder fixing seat (40). The side of the column (44) is equipped with a wire harness protection chain (43) through the wire harness protection chain seat (42). The wire harness protection chain (43) slides up and down with the tightening machine (31) to protect the connecting cable of the tightening machine (31). The wire guide rail fixing plate (46) at the lower end of the wire guide rail (47) is provided with a limiting rubber (36) and a buffer seat bracket (35). The limiting rubber (36) is used to limit the downward sliding stroke of the wire guide rail slide (48). The buffer seat bracket (35) is equipped with a buffer seat (34) to buffer and stop the tightening machine fixing seat (33).

7. An assembly method using the traction arm assembly equipment as described in any one of claims 1 to 6, characterized in that: Includes the following steps: Step 1: Rotate the cylinder control valve (66) to control the left clamping cylinder seat (58) and the right clamping cylinder (54) to loosen, while the first cylinder (69) drives the nut mounting seat (65) to move downward; Step 2: First, install the nut (67) into the nut mounting seat (65) through the parts inlet / outlet (201), and then position the traction arm bracket (61) on the traction arm bracket positioning plate (57); Step 3: Rotate the cylinder control valve (66) to control the left clamping cylinder seat (58) and the right clamping cylinder (54) to clamp the traction arm bracket (61). At the same time, the first cylinder (69) drives the nut mounting seat (65) to move upward to below the traction arm bracket (61). Step 4: Insert the bushing (504) of the traction arm (60) into the center hole of the traction arm bracket (61) through the parts inlet / outlet (201), and use bolts (68) to pass through the traction arm bracket (61) and the traction arm (60). At the same time, put the U-shaped fork (503) of the traction arm (60) into the traction arm angle positioning seat, and use the traction arm positioning pin (62) to position the U-shaped fork (503). Step 5: Move away from the part inlet / outlet (201), press the operation switch button (6) to make the tightening machine (31) move downward to above the bolt (68) and gradually tighten the bolt (68). When the bolt (68) reaches the set torque value, the tightening machine (31) slides upward back to its original position. Step 6: Rotate the cylinder control valve (66) to control the left clamping cylinder seat (58) and the right clamping cylinder (54) to release the traction arm bracket (61). At the same time, the first cylinder (69) drives the nut mounting seat (65) to move downwards back to its original position. Take out the assembled traction arm assembly module (500) to complete one assembly operation.

8. The assembly method according to claim 7, characterized in that: Before the start of the first step, perform an inspection operation on the traction arm assembly equipment: turn on the power switch (7), observe whether the page display on the display screen (5) is normal, check whether the indicator light on the control panel (4) is normal, whether the switch on the control panel (4) is set to the initial position, whether the radiator (8) is operating normally, and check the airtightness of the working air pressure output module (600); after the tightening machine (31) slides back to its original position in the fifth step, observe the color indicated by the warning light (3), and after taking out the assembled traction arm assembly module (500) in the sixth step, mark whether the torque value of the traction arm assembly module (500) is qualified.

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