Directional assembly process for Pin needle of air spring shock absorber strut assembly

Abstract

The invention discloses an air spring shock absorber strut assembly Pin needle directional assembly process which comprises the following steps: S1, loading a shock absorber on a line: grabbing the shock absorber, photographing to recognize the state of a mistake-proof convex rib of the shock absorber, adjusting the posture of the shock absorber, and loading the shock absorber on the line; s2, vibration damper circulation is conducted, specifically, the vibration damper is clamped through a self-centering clamping mechanism of a speed chain and transferred to a combined assembly station; s3, assembling, wherein the mechanical transplanting module grabs the air spring sub-assembly, and the air spring sub-assembly and the shock absorber are assembled; s4, screwing a nut: inserting a bit braked by an electric torque wrench into a piston rod sleeve, and screwing a locking nut; according to the method, the state of the mistake-proof convex rib of the shock absorber is recognized through photographing, the corrected rotation angle parameter is converted according to the control system, it can be ensured that the shock absorber is on line at a correct angle, then the problem of subsequent assembly caused by mistake of the angle of the mistake-proof convex rib is avoided, and the assembly accuracy and the product consistency are improved.

Description

Technical Field

[0001] This invention patent relates to the technical field of the assembly of air spring shock absorber strut assemblies, and specifically to a Pin needle directional assembly process for air spring shock absorber strut assemblies. Background Art

[0002] The air spring shock absorber strut assembly is an important component in the automotive suspension system. The front air spring shock absorber strut assembly of an electric vehicle mainly consists of an upper end sealing connection part (including a dust cap, a nut, a retaining ring, an O-ring, etc.), an air spring sub-assembly (an air chamber, a bladder, a piston, etc.), a shock absorber body (including a piston rod, an oil storage cylinder, a spring plate, a bottom cover, etc.), a joint fork, and connecting bolts and nuts, etc. Among them,

[0003] Since the assembly line of the air spring shock absorber strut assembly lacks the direction recognition and control of the Pin needle and anti-misassembly rib (hereinafter referred to as "Pin needle and anti-misassembly rib" as "anti-misassembly rib") in the exposed end of the piston rod when the shock absorber is automatically loaded onto the line, and the shock absorber body rotates without restraint under the influence of various factors during transportation, the corresponding relationship state between the direction of the Pin needle inside the exposed end of the piston rod after assembly and one of the three connecting bolts (hereinafter referred to as "connecting bolt A") at the upper end of the air chamber is uncertain, resulting in a random angle of the anti-misassembly rib after assembly and being unable to maintain an angular relationship that meets the special requirements of customers. Therefore, a Pin needle directional assembly process for air spring shock absorber strut assemblies is provided. Summary of the Invention

[0004] The purpose of this invention patent is to provide a Pin needle directional assembly process for air spring shock absorber strut assemblies to solve the problems raised in the above background art.

[0005] To solve the above technical problems, this invention patent provides the following technical solution: A Pin needle directional assembly process for air spring shock absorber strut assemblies, including the following steps:

[0006] S1: Loading the shock absorber: Grasp the shock absorber, and at the same time take a photo to identify the state of the anti-misassembly rib of the shock absorber, and adjust the posture of the shock absorber before loading it onto the line;

[0007] The step S1 includes the following sub-steps:

[0008] S11: The robot grasps the shock absorber and transports it to the servo rotating table;

[0009] When the shock absorber is placed on the servo rotating table, it is positioned by the lower end face of the shock absorber, and at this time, the fixed position of the height of the piston rod of the shock absorber is determined;

[0010] S12: The camera takes a photo of the direction state of the anti-misassembly rib and forms a picture of the angular posture of the anti-misassembly rib and transmits it to the control system;

[0011] The camera is built into the robot, the camera height is fixed, and the camera focal length is pre-adjusted;

[0012] The camera takes photos of the piston rod end from top to bottom;

[0013] S13: The control system automatically converts the correction rotation angle parameter of the anti-error convex rib according to the standard preset angle and the anti-error convex rib picture, and forms a correction instruction of the anti-error convex rib and sends it to the servo rotary table;

[0014] The standard preset angle is set in advance;

[0015] The control system converts the correction rotation angle parameter of the anti-error convex rib in the following method: the control system compares the deviation between the angle of the anti-error convex rib and the standard preset angle, and forms the correction rotation angle parameter of the anti-error convex rib;

[0016] S14: The servo rotary table rotates the vibration absorber to a standard preset angle according to the correction instruction of the anti-error convex rib;

[0017] S15: Take a photo to identify the state of the inner spline groove of the piston rod, and accurately adjust the posture of the inner spline groove of the piston rod again (fine-tune with the minimum correction angle) before putting the shock absorber online;

[0018] The step S15 includes the following sub-steps:

[0019] S151: The robot drives the camera to adjust the focal length position, takes a picture of the inner spline groove of the piston rod from the upper end, and forms an inner spline groove picture which is transmitted to the control system;

[0020] S152: The control system automatically converts the minimum correction rotation angle parameter required for the internal spline groove according to the preset standard position and the internal spline groove image, and generates an internal spline groove correction instruction and sends it to the servo rotary table;

[0021] The preset standard position is set in advance;

[0022] The method for the control system to convert the correction rotation angle parameter of the internal spline groove is: the control system compares the deviation between the circumferential position of the internal spline groove and the standard preset position, and forms the correction rotation angle parameter of the internal spline groove;

[0023] S153: The servo rotary table rotates the inner spline groove to a standard preset position according to the correction instruction of the inner spline groove;

[0024] S2: Shock absorber circulation: The shock absorber is clamped and transferred to the assembly station through the self-centering clamping mechanism of the double-speed chain;

[0025] The step S2 includes the following sub-steps:

[0026] S21: The manipulator grabs the shock absorber on the servo rotating table and transports it to the self-centering clamping mechanism of the double-speed chain;

[0027] S22: The execution end of the self-centering clamping mechanism clamps the outer cylinder of the shock absorber and ensures the stable attitude of the shock absorber;

[0028] S23: The double-speed chain transports the self-centering clamping mechanism holding the shock absorber to the assembly station

[0029] S3: Assembly: The mechanical transplanting module grabs the air spring sub-assembly and assembles the air spring sub-assembly with the shock absorber;

[0030] The mechanical transplanting module includes a horizontal transplanting mechanism and a servo transplanting gripper;

[0031] The step S3 includes the following sub-steps:

[0032] S31: The horizontal transplanting mechanism grabs the air spring sub-assembly at the storage position and transports it to the grabbing position;

[0033] The air spring sub-assembly has been pre-installed and placed with orientation and positioning in advance;

[0034] The pre-installed orientation and positioning placement is as follows: Before the air spring sub-assembly is put on the line, the lower positioning tooling centers and positions the circumference of the lower piston of the air spring sub-assembly. The red light of the laser sensor set on the frame of this station is aligned with the connecting bolt A on the air chamber of the air spring sub-assembly and the axis O of the air spring sub-assembly. There are circumferential pins on the upper positioning tooling that cooperate with three positioning process holes at the upper end of the air chamber to position the upper end of the air chamber;

[0035] S32: The servo transplanting gripper grabs the air spring sub-assembly at the grabbing position and sleeves the air spring sub-assembly onto the shock absorber;

[0036] The step S32 includes the following sub-steps:

[0037] S321: The servo transplanting gripper grabs and lifts the air spring sub-assembly in the vertical direction;

[0038] S322: The servo transplanting gripper carries the air spring sub-assembly and moves horizontally to directly above the shock absorber;

[0039] S323: The servo transplanting gripper carries the air spring sub-assembly and descends, sleeving the air spring sub-assembly onto the shock absorber;

[0040] During the process of sleeving the air spring sub-assembly onto the shock absorber, the piston rod of the shock absorber is guided by the central guiding sleeve to pass through the piston, buffer block and inner hole of the central rubber of the air spring sub-assembly in sequence and expose the inner hole of the central rubber;

[0041] S33: The assembled air spring shock absorber is driven by the double-speed chain to the nut assembly station;

[0042] S4: Install the nut: Insert the bit of the electric torque wrench into the piston rod sleeve and tighten the locking nut.

[0043] The step S4 includes the following sub-steps:

[0044] S41: The transplanting mechanism sends the locking nut into the hexagon socket of the electric torque wrench.

[0045] S42: The electric torque wrench descends to a predetermined height so that the end of the braking bit abuts against the upper end face of the piston rod.

[0046] S43: The hexagon socket and the locking nut in the hexagon socket remain stationary under the magnetic force of the magnet embedded in the socket, and the braking bit rotates slowly until the outer wall teeth of the braking bit are aligned with the inner grooves of the internal spline groove, and then it can be inserted into the internal spline groove of the piston rod.

[0047] S44: The whole electric torque wrench descends and screws the locking nut onto the external thread of the piston rod until the torque meets the requirements.

[0048] The beneficial effects achieved by this invention patent are as follows:

[0049] 1. By photographing and identifying the state of the anti-misassembly rib of the shock absorber and calculating the corrected rotation angle parameter according to the control system, it can ensure that the shock absorber is put on the production line at the correct angle, thereby avoiding problems in subsequent assembly caused by incorrect angles of the anti-misassembly ribs, and improving the accuracy of assembly and the consistency of products.

[0050] 2. Photograph and identify the internal spline groove of the piston rod and adjust its posture so that the internal spline groove is in the correct position. For the subsequent link of screwing the nut with the braking bit, the correct posture of the internal spline groove helps the accurate insertion and operation of the bit of the electric torque wrench, thus ensuring the accuracy of the whole assembly process, reducing the assembly error caused by incorrect postures of components, and improving the product quality.

[0051] 3. Before the air spring sub-assembly is put on the production line, pre-assembly orientation and positioning are carried out. The lower piston is centered and positioned by the lower positioning tooling, and the upper end of the air chamber is positioned by the upper positioning tooling. This precise positioning method ensures the position accuracy of the air spring sub-assembly during the combined assembly. During the combined assembly with the shock absorber, it can ensure the precise fit of the two, improving the success rate of the combined assembly and the product quality. Description of the Drawings

[0052] Figure 1 It is a flowchart of a control method for the Pin needle orientation assembly process of an air spring shock absorber strut assembly in the embodiment;

[0053] Figure 2 It is a schematic structural diagram of the anti-misassembly rib, Pin needle and internal spline groove in the embodiment;

[0054] Figure 3 Schematic diagram of the position of the connecting bolt A and the axis O of the air spring sub-assembly in the embodiment. DETAILED DESCRIPTION

[0055] The present invention is further described below in conjunction with the accompanying drawings.

[0056] like Figure 1 As shown, the present invention discloses a pin directional assembly process of an air spring shock absorber strut assembly, comprising the following steps:

[0057] S1: Shock absorber online: grab the shock absorber, take photos to identify the state of the shock absorber's anti-error ribs, and adjust the shock absorber's posture before going online;

[0058] Step S1 includes the following sub-steps:

[0059] S11: The robot grabs the shock absorber and transports it to the servo rotating table;

[0060] When the shock absorber is placed on the servo rotating table, the lower end surface of the shock absorber is positioned, and the height of the shock absorber piston rod is fixed at this time;

[0061] S12: The camera takes a picture of the direction state of the anti-mistake convex rib, and forms an angle posture picture of the anti-mistake convex rib and transmits it to the control system;

[0062] The camera is built into the robot, the camera height is fixed, and the camera focal length is pre-adjusted;

[0063] The camera takes pictures of the piston rod end from top to bottom;

[0064] S13: The control system automatically converts the correction rotation angle parameter of the anti-error convex rib according to the standard preset angle and the anti-error convex rib picture, and forms a correction instruction of the anti-error convex rib and sends it to the servo rotary table;

[0065] The standard preset angles are set in advance;

[0066] The method for the control system to convert the correction rotation angle parameter of the error-proofing convex rib is as follows: the control system compares the deviation between the angle of the error-proofing convex rib and the standard preset angle, and forms the correction rotation angle parameter of the error-proofing convex rib;

[0067] S14: The servo rotary table rotates the vibration absorber to a standard preset angle according to the correction instruction of the anti-error convex rib;

[0068] S15: Take a photo to identify the state of the inner spline groove of the piston rod, and accurately adjust the posture of the inner spline groove of the piston rod again (fine-tune with the minimum correction angle) before putting the shock absorber online;

[0069] Step S15 includes the following sub-steps:

[0070] S151: The robot drives the camera to adjust the focal length position, takes pictures of the internal spline groove of the piston rod from the upper end, and forms pictures of the internal spline groove to be transmitted to the control system;

[0071] S152: According to the preset standard position and the pictures of the internal spline groove, the control system automatically calculates the minimum correction rotation angle parameter required for the internal spline groove, and forms a correction instruction for the internal spline groove to be sent to the servo rotating table;

[0072] The preset standard position is set in advance;

[0073] The method for the control system to calculate the correction rotation angle parameter of the internal spline groove is: the control system compares the deviation between the circumferential position of the internal spline groove and the standard preset position, and forms the correction rotation angle parameter of the internal spline groove;

[0074] S153: The servo rotating table rotates the internal spline groove to the standard preset position according to the correction instruction of the internal spline groove;

[0075] S2: Shock absorber transfer: The shock absorber is clamped by the self-centering clamping mechanism of the double-speed chain and transferred to the assembly station;

[0076] Step S2 includes the following sub-steps:

[0077] S21: The manipulator grabs the shock absorber on the servo rotating table and transports it to the self-centering clamping mechanism of the double-speed chain;

[0078] S22: The execution end of the self-centering clamping mechanism clamps the outer cylinder of the shock absorber and ensures the stable posture of the shock absorber;

[0079] S23: The double-speed chain transports the self-centering clamping mechanism holding the shock absorber to the assembly station

[0080] S3: Assembly: The mechanical transplanting module grabs the air spring sub-assembly and assembles the air spring sub-assembly with the shock absorber;

[0081] The mechanical transplanting module includes a horizontal transplanting mechanism and a servo transplanting gripper;

[0082] Step S3 includes the following sub-steps:

[0083] S31: The horizontal transplanting mechanism grabs the air spring sub-assembly at the storage position and sends it to the grabbing position;

[0084] The air spring sub-assembly has been pre-assembled and placed in a directional and positioned manner in advance;

[0085] The pre-installed orientation and positioning are as follows: Before the air spring sub-assembly is loaded onto the production line, the lower positioning tooling centers and positions the circumference of the piston at the lower end of the air spring sub-assembly. The red light of the laser sensor set on the frame of this station is aligned with the connecting bolt A on the air chamber of the air spring sub-assembly and the axis O of the air spring sub-assembly. On the upper positioning tooling, there are circumferential pins that cooperate with three positioning process holes at the upper end of the air chamber to position the upper end of the air chamber;

[0086] S32: The servo transplant gripper grabs the air spring sub-assembly at the grabbing position and sleevs the air spring sub-assembly onto the shock absorber;

[0087] Step S32 includes the following sub-steps:

[0088] S321: The servo transplant gripper grabs and lifts the air spring sub-assembly in the vertical direction;

[0089] S322: The servo transplant gripper carries the air spring sub-assembly and moves horizontally to directly above the shock absorber;

[0090] S323: The servo transplant gripper carries the air spring sub-assembly and moves downward to sleeve the air spring sub-assembly onto the shock absorber;

[0091] During the process of sleeving the air spring sub-assembly onto the shock absorber, the piston rod of the shock absorber is guided by the center guiding sleeve to sequentially pass through the piston, buffer block, and inner hole of the center rubber of the air spring sub-assembly and expose the inner hole of the center rubber;

[0092] S33: The assembled air spring shock absorber is transmitted to the nut assembly station by the double-speed chain;

[0093] S4: Install the nut: The bit of the electric torque wrench is inserted into the piston rod sleeve and the lock nut is tightened;

[0094] Step S4 includes the following sub-steps:

[0095] S41: The transplant mechanism sends the lock nut into the hexagon socket of the electric torque wrench;

[0096] S42: The electric torque wrench moves downward to a predetermined height so that the end of the braking bit abuts against the upper end face of the piston rod;

[0097] S43: The lock nut in the hexagon socket and the hexagon socket remain stationary under the magnetic force of the magnet embedded in the socket. The braking bit rotates slowly until the outer wall teeth (a total of 12 are evenly distributed in the circumference) of the braking bit are aligned with the inner grooves (a total of 12 are evenly distributed in the circumference) of the internal spline groove, and then it can be inserted into the internal spline groove of the piston rod;

[0098] S44: The entire electric torque wrench moves downward and screws the lock nut onto the external thread of the piston rod until the torque meets the requirements.

[0099] This invention patent identifies the state of the anti-misassembly rib of the shock absorber by photographing, and calculates the corrected rotation angle parameter according to the control system, which can ensure that the shock absorber is put on the production line at the correct angle, thereby avoiding problems in subsequent assembly caused by incorrect angles of the anti-misassembly ribs, improving the assembly accuracy and product consistency. At the same time, by photographing and identifying the internal spline groove of the piston rod and adjusting its posture, the internal spline groove is in the correct position. For the subsequent process of screwing the nut with the brake bit, the correct posture of the internal spline groove helps the accurate insertion and operation of the bit of the electric torque wrench, thus ensuring the accuracy of the entire assembly process, reducing the assembly error caused by incorrect part postures, and improving the product quality. Before the spring sub-assembly is put on the production line, pre-assembly orientation and positioning are carried out. The lower positioning tooling centers and positions the circumference of the lower piston, and the upper positioning tooling positions the upper end of the air chamber. This precise positioning method ensures the position accuracy of the air spring sub-assembly during assembly. During the assembly process with the shock absorber, it can ensure the precise fit of the two, improving the assembly success rate and product quality.

[0100] The above is only a preferred specific embodiment of this invention patent, but the protection scope of this invention patent is not limited thereto. Any person skilled in the art within the technical scope disclosed by this invention patent, according to the technical solution and inventive concept of this invention patent, making equivalent substitutions or changes, shall be covered by the protection scope of this invention patent.

Claims

1. A pin directional assembly process for an air spring damper strut assembly, characterized in that: The steps include: S1: Shock absorber online: grab the shock absorber, take photos to identify the state of the shock absorber's anti-error ribs, and adjust the shock absorber's posture before going online; S2: Shock absorber circulation: The shock absorber is clamped and transferred to the assembly station through the self-centering clamping mechanism of the double-speed chain; S3: Assembly: The mechanical transfer module grabs the empty spring sub-assembly and assembles the empty spring sub-assembly with the shock absorber; S4: Tighten the nut: Insert the bit of the electric torque wrench into the piston rod sleeve and tighten the lock nut.

2. The pin-oriented assembly process of the air spring shock absorber strut assembly according to claim 1 is characterized in that: The step S1 includes the following sub-steps: S11: The robot grabs the shock absorber and transports it to the servo rotating table; When the shock absorber is placed on the servo rotating table, the lower end surface of the shock absorber is positioned, and at this time, the height of the shock absorber piston rod is fixed at a certain position; S12: The camera takes a picture of the direction state of the anti-mistake convex rib, and forms an angle posture picture of the anti-mistake convex rib and transmits it to the control system; The camera is built into the robot, the camera height is fixed, and the camera focal length is pre-adjusted; The camera takes photos of the piston rod end from top to bottom; S13: The control system automatically converts the correction rotation angle parameter of the anti-error convex rib according to the standard preset angle and the anti-error convex rib picture, and forms a correction instruction of the anti-error convex rib and sends it to the servo rotary table; The standard preset angle is set in advance; The control system converts the correction rotation angle parameter of the anti-error convex rib in the following method: the control system compares the deviation between the angle of the anti-error convex rib and the standard preset angle, and forms the correction rotation angle parameter of the anti-error convex rib; S14: The servo rotary table rotates the vibration absorber to a standard preset angle according to the correction instruction of the anti-error rib.

3. The pin-oriented assembly process of the air spring shock absorber strut assembly according to claim 2 is characterized in that: The step S1 also includes the sub-steps: S15: taking photos to identify the state of the inner spline groove of the piston rod, and accurately adjusting the posture of the inner spline groove of the piston rod again before putting the shock absorber on line; The step S15 includes the following sub-steps: S151: The robot drives the camera to adjust the focal length position, takes a picture of the inner spline groove of the piston rod from the upper end, and forms an inner spline groove picture which is transmitted to the control system; S152: The control system automatically converts the minimum correction rotation angle parameter required for the internal spline groove according to the preset standard position and the internal spline groove image, and generates an internal spline groove correction instruction and sends it to the servo rotary table; The preset standard position is set in advance; The method for the control system to convert the correction rotation angle parameter of the internal spline groove is: the control system compares the deviation between the circumferential position of the internal spline groove and the standard preset position, and forms the correction rotation angle parameter of the internal spline groove; S153: The servo rotary table rotates the inner spline groove to a standard preset position according to the correction instruction of the inner spline groove.

4. The pin-oriented assembly process of the air spring shock absorber strut assembly according to claim 1 is characterized in that: The step S2 includes the following sub-steps: S21: The manipulator grabs the shock absorber on the servo rotary table and transports it to the self-centering clamping mechanism of the double-speed chain; S22: The execution end of the self-centering clamping mechanism clamps the outer cylinder of the shock absorber and ensures that the shock absorber has a stable posture; S23: The double-speed chain conveys the self-centering clamping mechanism holding the shock absorber to the assembly station.

5. The pin directional assembly process of the air spring shock absorber strut assembly according to claim 1 is characterized in that: The mechanical transplanting module includes a horizontal transplanting mechanism and a servo transplanting clamp, and the step S3 includes the following sub-steps: S31: the horizontal transfer mechanism grabs the empty spring sub-assembly at the storage position and sends it to the grabbing position; The empty spring sub-assembly has been pre-installed and positioned in a directional manner; The pre-installed directional positioning and placement is as follows: before the empty spring sub-assembly is put on the line, the lower positioning tool is used to center the piston of the lower end of the empty spring sub-assembly, and the red light of the laser sensor set on the frame of this station is aligned with the connecting bolt A on the air chamber of the empty spring sub-assembly and the axis O of the empty spring sub-assembly, and the upper positioning tool is provided with a circumferential pin that cooperates with the three positioning process holes on the upper end of the air chamber to position the upper end of the air chamber; S32: The servo transplanting gripper grabs the empty spring sub-assembly on the grabbing position, and sets the empty spring sub-assembly onto the shock absorber; S33: The assembled air spring shock absorber is driven to the nut assembly station along with the speed chain.

6. The pin directional assembly process of the air spring shock absorber strut assembly according to claim 5 is characterized in that: The step S32 includes the following sub-steps: S321: The servo transplanting clamp grasps and lifts the empty spring sub-assembly in a vertical direction; S322: The servo transplanting clamp carries the empty spring sub-assembly and moves horizontally to just above the shock absorber; S323: The servo transplanting clamp carries the empty spring sub-assembly downward, and sets the empty spring sub-assembly onto the shock absorber; During the assembly of the air spring sub-assembly and the shock absorber, the piston rod of the shock absorber is guided by the central guide sleeve to sequentially pass through the piston, the buffer block and the central rubber inner hole of the air spring sub-assembly and expose the central rubber inner hole.

7. The pin directional assembly process of the air spring shock absorber strut assembly according to claim 1 is characterized in that: The step S4 includes the following sub-steps: S41: The transfer mechanism sends the locking nut into the hexagon socket of the electric torque wrench; S42: The electric torque wrench moves downward to a predetermined height, so that the end of the brake bit abuts against the upper end surface of the piston rod; S43: The hexagon socket and the locking nut in the hexagon socket remain stationary under the magnetic force of the magnet embedded in the socket, and the brake bit rotates slowly until the outer wall teeth of the brake bit are aligned with the inner groove of the inner spline groove, and then the brake bit can be inserted into the inner spline groove of the piston rod; S44: Move the electric torque wrench downward as a whole and tighten the lock nut onto the outer thread of the piston rod until the torque meets the requirement.

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