A cabinet sheet metal spraying processing device

Abstract

The application relates to the technical field of spraying robots, and discloses a case sheet metal spraying processing device, which comprises a base, a rear end mechanical arm and a front end mechanical arm provided with a spraying gun, further comprises a dispersion support assembly arranged on the rear end mechanical arm, the dispersion support assembly comprises: a pressure bearing assembly fixedly connected to a frame of the rear end mechanical arm; a tractor arranged on the pressure bearing assembly; a traction rope, one end of which is fixedly connected to the front end mechanical arm and deviates from the rotating axis of the front end mechanical arm at a connecting point, and the other end is connected to the tractor after passing through the pressure bearing assembly. The application has the advantages of reducing the pressure borne by the joints of the spraying robot, solves the problem that the driving force of the existing spraying robot driving mechanical arm is concentrated on the joints, the pressure borne by the joints is relatively large when the joints are moving and carrying heavy objects, the wear is relatively large, and the spraying position positioning accuracy is reduced due to the looseness of the joints.

Description

Technical Field

[0001] This invention relates to the field of spray painting robot technology, specifically to a chassis sheet metal spray painting processing device. Background Technology

[0002] Sheet metal chassis are made of thin metal sheets through cold processing processes such as shearing, punching, bending, and welding. In modern industrial production, painting robots are usually used for subsequent painting. When the painting robot changes angle, the joints of the robotic arm bear the pressure, which can easily cause wear and tear on the joints and reduce rotational accuracy.

[0003] A search revealed Chinese invention patent CN110154045A, which discloses a flexible cable-driven series four-degree-of-freedom spraying robot arm. The robot arm connects each joint to the drive motor via a first and second flexible cable, transmitting motion and force. This design overcomes the shortcomings of traditional robot arms, which install reduction and drive devices at each joint, resulting in a large overall mass and inertia. It reduces the mass and volume of the extended part of the robot arm, lowers the load on the drive motor, and improves the overall motion performance and dynamic response of the robot arm.

[0004] The aforementioned device uses ropes to pull the robotic arm to rotate. The force driving the robotic arm to rotate is still concentrated at the joints, resulting in greater pressure and wear at the joints when moving and bearing heavy objects. This can easily lead to loosening of the joints, causing a decrease in the accuracy of the spraying position. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a chassis sheet metal spraying processing device, which has the advantage of reducing the pressure on the joints of the spraying robot. It solves the problem that the force driving the mechanical arm of the existing spraying robot is concentrated at the joints, resulting in greater pressure and wear on the joints when moving and bearing heavy objects, and the joints are prone to loosening, which leads to a decrease in the accuracy of spraying position positioning.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A chassis sheet metal spraying processing device includes a base, a rear robotic arm, and a front robotic arm with a spray gun. The rear robotic arm and the front robotic arm are rotatably connected via a rotary joint. A first motor for driving the rotation of the front robotic arm is fixedly connected to the rear robotic arm. The device also includes a distributed support assembly disposed on the rear robotic arm, the distributed support assembly comprising: The pressure-bearing component is fixedly connected to the frame of the rear robotic arm; The traction device is mounted on the pressure-bearing component; The traction rope has one end fixedly connected to the front robotic arm, with the connection point offset from the rotation axis of the front robotic arm, and the other end passing around the pressure-bearing component and connected to the traction device. The traction device is used to apply traction force to the traction rope, so that the traction rope generates a torque on the front end robotic arm pointing towards the rear end robotic arm. When the traction rope is under tension, it squeezes the pressure-bearing component and transmits the reaction force of the tension to the frame of the rear end robotic arm through the pressure-bearing component, thereby transferring at least part of the load of the front end robotic arm on the rotating joint to the frame of the rear end robotic arm.

[0007] Furthermore, the pressure-bearing component includes: The external support is fixed to the side of the rear robotic arm away from the front robotic arm; The main support assembly is located above the first motor and is flexibly mounted on the top of the outer bracket; An auxiliary support component is flexibly mounted on the end of the outer bracket away from the front-end robotic arm; When the traction device applies tension, the traction rope squeezes the main support component, causing it to elastically contract and press against the auxiliary support component.

[0008] Furthermore, the auxiliary support component includes: The first spring, the lower end of which is fixed to the top of the outer bracket; The support frame is fixedly connected to the upper end of the first spring; A limiting plate, one end of which is rotatably connected to the bottom of the support frame, and the other end of which penetrates the support frame vertically and extends to the top of the support frame, wherein the limiting plate and the support frame are slidably engaged.

[0009] Furthermore, the main support component includes: At least two sliding frames are provided, which are slidably connected to the outer support. The lifting block is slidably connected to the side wall of the sliding frame. The top of the outer bracket is provided with a sliding groove for the lifting block to slide. The lifting block extends from the inside of the outer bracket through the sliding groove to the outside of the outer bracket. The second spring has one end connected to the sliding frame and the other end connected to the lifting block; The pad is fixed to the top of the lifting block.

[0010] Furthermore, the top of the pad is provided with a guide groove extending along the axis of the traction rope, a guide wheel is rotatably connected in the guide groove, and an annular groove is provided on the outer side of the guide wheel.

[0011] Furthermore, the outer support is provided with an intermediate plate, which is located between the two sliding frames, and a connecting rod is rotatably connected between the intermediate plate and the lifting block.

[0012] Furthermore, the outer support is provided with a lifting frame, and at least two limiting rods are fixedly connected to the bottom of the middle plate. The limiting rods penetrate the lifting frame in the vertical direction and slide with the lifting frame. The connecting rod is provided with a protruding post, which extends into the lifting frame and abuts against the inner wall of the lifting frame.

[0013] Furthermore, the traction device includes an outer frame, a winding rod, and a second motor. The outer frame is fixed to the pressure-bearing assembly, the winding rod is rotatably connected inside the outer frame, and its axis is perpendicular to the extension direction of the traction rope. The second motor is fixed to the outer frame and is used to drive the winding rod to rotate. One end of the traction rope is fixedly connected to the winding rod.

[0014] Furthermore, a tension sensor is connected in series on the traction rope, and the tension sensor is used to detect the traction force applied to the traction rope by the traction device.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a chassis sheet metal spraying processing device, which has the following beneficial effects: 1. This chassis sheet metal spraying processing device, through the set distributed support components, the traction device pulls the traction rope, which in turn pulls the front robotic arm, causing the front robotic arm to generate a torque pointing towards the rear robotic arm. During this process, the traction rope squeezes the pressure-bearing components, using the traction force to reduce the pressure on the joints of the spraying robot, distributing the weight of the front robotic arm to the joints and the frame of the rear robotic arm. This avoids the force of the spraying robot driving the robotic arm to rotate being concentrated at the joints, and avoids excessive pressure on the joints when moving and bearing heavy objects, thus reducing wear at the joints. It can also mitigate the situation where loose joints of the spraying robot lead to a decrease in the accuracy of spraying position positioning.

[0016] 2. The sheet metal spraying processing device for the chassis, through the setting of pressure-bearing components, increases the area supported by the traction rope, thereby making the force of the traction rope more evenly distributed through the main support components and auxiliary support components to different positions of the outer bracket and the rear robotic arm. This not only allows the rear robotic arm to evenly distribute the support force over a larger area, reducing the pressure on the rear robotic arm at a single position, but also increases the area supported by the traction rope and the bending angle, reducing the contact pressure and contact stress when the traction rope is supported, thereby reducing the wear of the rope from multiple angles.

[0017] 3. The sheet metal spraying processing device for the chassis, through the main support component, can adjust the area of ​​friction when the traction rope moves axially according to the change of the swing angle of the front robotic arm, so as to avoid the concentrated wear of the traction rope and the resulting large local wear damage.

[0018] 4. The chassis sheet metal spraying processing device, through the setting of intermediate plate, connecting rod, lifting frame and limit rod, can automatically drive the main support component away from the front robotic arm when the front robotic arm rotates upward at a large angle, so as to avoid the front robotic arm being blocked by the main support component when the front robotic arm rotates upward at a large angle.

[0019] 5. The chassis sheet metal spraying processing device, through the set guide wheel and auxiliary support components, can promote the movement of the traction rope along its axis, reduce the possibility of the traction rope twisting when moving axially, and at the same time, the support frame can better fit the traction rope when the angle of the traction rope changes, increasing the area of ​​the traction rope being supported, thereby reducing the degree of damage caused by friction of the traction rope. Attached Figure Description

[0020] Figure 1 This is a perspective view of the painting robot of the present invention.

[0021] Figure 2 This is a front view of the painting robot of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the distributed support component of the present invention.

[0023] Figure 4 This is a perspective view of the main support component of the present invention.

[0024] Figure 5 This is a front view of the main support component of the present invention.

[0025] Figure 6 This is a structural schematic diagram of the main support component and the lifting frame of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the pad of the present invention.

[0027] Figure 8 This is a schematic diagram of the structure of the external support and auxiliary support components of the present invention.

[0028] In the diagram: 1. Base; 2. Rear robotic arm; 3. Front robotic arm; 4. First motor; 5. Distributed support assembly; 51. Pressure-bearing assembly; 511. Outer bracket; 512. Main support assembly; 5121. Sliding frame; 5122. Lifting block; 5123. Second spring; 5124. Pad; 513. Auxiliary support assembly; 5131. First spring; 5132. Support frame; 5133. Limiting plate; 52. Traction device; 53. Traction rope; 6. Guide wheel; 7. Intermediate plate; 8. Connecting rod; 9. Lifting frame; 10. Limiting rod; 11. Tension sensor. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Example 1: This embodiment provides a chassis sheet metal spraying processing device, which has the following technical features.

[0034] Please see Figures 1-5A chassis sheet metal spraying processing device includes a base 1, a rear robotic arm 2, and a front robotic arm 3 equipped with a spray gun. The rear robotic arm 2 and the front robotic arm 3 are rotatably connected via a rotating joint. A first motor 4 for driving the rotation of the front robotic arm 3 is fixedly connected to the rear robotic arm 2. The device also includes a distributed support assembly 5 disposed on the rear robotic arm 2. The distributed support assembly 5 includes: a pressure-bearing component 51 fixedly connected to the frame of the rear robotic arm 2; a traction device 52 disposed on the pressure-bearing component 51; and a traction rope 53, one end of which is fixedly connected to the front robotic arm 3. On arm 3, with the connection point offset from the rotation axis of the front robotic arm 3, the other end passes around the pressure-bearing component 51 and is connected to the traction device 52; wherein, the traction device 52 is used to apply traction force to the traction rope 53, so that the traction rope 53 generates a torque on the front robotic arm 3 in the direction of the rear robotic arm 2. When the traction rope 53 is under tension, it squeezes the pressure-bearing component 51 and transmits the reaction force of the tension to the frame of the rear robotic arm 2 through the pressure-bearing component 51, thereby transferring at least part of the load of the front robotic arm 3 on the rotation joint to the frame of the rear robotic arm 2.

[0035] Working principle: When the robotic arm of the painting robot rotates, the first motor 4 drives the front robotic arm 3 to rotate, which in turn moves the spray gun to the machine box for painting. The joint connecting the front robotic arm 3 and the rear robotic arm 2 bears the weight of the front robotic arm 3. The distributed support component 5 pulls the front robotic arm 3 from the frame of the rear robotic arm 2, transferring part of the weight of the front robotic arm 3 to the frame of the rear robotic arm 2, reducing the pressure on the joint and thus reducing wear on the joints of the painting robot. The specific working process of the distributed support component 5 is as follows: The traction device 52 pulls the traction rope 53, which in turn pulls the front robotic arm 3, causing the front robotic arm 3 to generate a torque pointing towards the rear robotic arm 2. During this process, the traction rope 53 squeezes the pressure-bearing component 51, using the traction force to reduce the pressure on the joints of the painting robot. This distributes the weight of the front robotic arm 3 to the joints and the frame of the rear robotic arm 2, preventing the force driving the robotic arm to rotate from being concentrated at the joints. This also prevents the joints from bearing excessive pressure during movement and when carrying heavy objects, reducing wear at the joints and mitigating the situation where loose joints lead to a decrease in the accuracy of the painting position.

[0036] Please see Figure 3The pressure-bearing component 51 includes: an outer support 511, fixed to the side of the rear robotic arm 2 away from the front robotic arm 3; a main support component 512, located above the first motor 4 and elastically mounted on the top of the outer support 511; and an auxiliary support component 513, elastically mounted on the end of the outer support 511 away from the front robotic arm 3. When the traction device 52 applies tension, the traction rope 53 squeezes the main support component 512 to cause it to elastically contract and presses against the auxiliary support component 513.

[0037] In practical use, after the traction rope 53 is pulled by the traction device 52, it squeezes the main support component 512. After the main support component 512 is squeezed downward and elastically moved, it continues to squeeze onto the auxiliary support component 513. At this time, the middle of the traction rope 53 is supported at different positions by the main support component 512 and the auxiliary support component 513. Through the outer bracket 511, it acts on the frame of the rear robotic arm 2, increasing the area supported by the traction rope 53. This allows the force of the traction rope 53 to be more evenly distributed through the main support component 512 and the auxiliary support component 513 to different positions of the outer bracket 511 and the rear robotic arm 2. This not only allows the rear robotic arm 2 to evenly distribute the support force over a larger area, reducing the pressure on the rear robotic arm 2 at a single position, but also increases the area supported by the traction rope 53 and the bending angle, reducing the contact pressure and contact stress when the traction rope 53 is supported, thereby reducing the wear of the rope from multiple angles.

[0038] Please see Figure 4 and Figure 5 The main support assembly 512 includes: a sliding frame 5121, at least two of which are slidably connected to the outer bracket 511; a lifting block 5122, which is slidably connected to the side wall of the sliding frame 5121; a groove for the lifting block 5122 to slide on the top of the outer bracket 511; the lifting block 5122 extending from the inside of the outer bracket 511 through the groove to the outside of the outer bracket 511; a second spring 5123, one end of which is connected to the sliding frame 5121 and the other end of which is connected to the lifting block 5122; and a pad 5124, which is fixed to the top of the lifting block 5122.

[0039] In practical use, the traction rope 53 squeezes the pad 5124, pushing the pad 5124 and the lifting block 5122 down, which in turn squeezes and retracts the second spring 5123. Depending on whether the front-end robotic arm 3 rotates upwards or downwards along the joint, the specific process of the traction rope 53 squeezing the pad 5124 is as follows: When the front robotic arm 3 rotates downwards, refer to Figure 5When the traction rope 53 bends significantly around the pad 5124, the angle between the traction rope 53 and the pad 5124 is small. At this time, the traction rope 53 mainly presses against the left pad 5124, and the friction area of ​​the traction rope 53 when it is pulled is mainly concentrated around the left pad 5124. When the front end robotic arm 3 rotates upward above the horizontal plane, the bend of the traction rope 53 around the pad 5124 is smaller, and the angle between the traction rope 53 and the pad 5124 is larger. Since the connection point between the traction rope 53 and the front end robotic arm 3 is raised, the traction rope 53 mainly presses against the right pad 5124. The friction area of ​​the traction rope 53 when it is pulled is mainly concentrated around the right pad 5124. This allows the friction area of ​​the traction rope 53 during axial movement to be adjusted according to the change in the swing angle of the front end robotic arm 3, avoiding concentrated wear on the traction rope 53 and resulting in localized damage.

[0040] Please see Figure 3 The traction device 52 includes an outer frame, a winding rod, and a second motor. The outer frame is fixed to the pressure-bearing component 51. The winding rod is rotatably connected inside the outer frame, and its axis is perpendicular to the extension direction of the traction rope 53. The second motor is fixed to the outer frame and is used to drive the winding rod to rotate. One end of the traction rope 53 is fixedly connected to the winding rod. A tension sensor 11 is connected in series on the traction rope 53. The tension sensor 11 is used to detect the traction force applied by the traction device 52 to the traction rope 53.

[0041] In practical use, the second motor drives the winding rod to rotate, winding the traction rope 53 onto the winding rod, so that the traction rope 53 generates a torque pointing in the direction of the rear robotic arm 2. During the traction process, the tension of the traction rope 53 acts on the tension sensor 11. The tension sensor 11 transmits the tension signal to the second motor. After the tension sensor 11 detects that the tension has reached the predetermined value, the second motor stops rotating, maintaining a stable tension value of the traction rope 53. It can pull the front robotic arm 3 from the upper frame of the rear robotic arm 2, and at the same time, it can flexibly control the force of pulling the front robotic arm 3.

[0042] Example 2: This embodiment provides a chassis sheet metal spraying processing device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0043] Please see Figures 1-6 An intermediate plate 7 is provided on the outer support 511. The intermediate plate 7 is located between two sliding frames 5121. A connecting rod 8 is rotatably connected between the intermediate plate 7 and the lifting block 5122. A lifting frame 9 is provided inside the outer support 511. At least two limiting rods 10 are fixedly connected to the bottom of the intermediate plate 7. The limiting rods 10 penetrate the lifting frame 9 in the vertical direction and slide with the lifting frame 9. A protruding post is provided on the connecting rod 8. The protruding post extends into the lifting frame 9 and abuts against the inner wall of the lifting frame 9.

[0044] Working principle: When the front robotic arm 3 rotates upward to above the horizontal plane, the connection point between the traction rope 53 and the front robotic arm 3 rises. At this time, the traction rope 53 squeezes the right-side pad 5124. After the right-side pad 5124 and the lifting block 5122 descend, refer to... Figure 6 The lifting block 5122 drives the right connecting rod 8 to rotate downwards, and the connecting rod 8 pushes the lifting frame 9 to slide downwards. The limiting rod 10 limits the lifting frame 9 longitudinally to maintain the stability of the lifting frame 9 during lifting. When the lifting frame 9 descends, it drives the left connecting rod 8 to rotate downwards. During the rotation, the connecting rod 8 not only descends, but its bottom end also moves to the right. The left connecting rod 8 pulls the left lifting block 5122 and the pad 5124, causing the left lifting block 5122 and the pad 5124 to move to the right. This causes the main support component 512 to move a small distance away from the front robotic arm 3. When the front robotic arm 3 rotates upwards at a large angle, it can automatically drive the main support component 512 away from the front robotic arm 3, avoiding the front robotic arm 3 being blocked by the main support component 512 when it rotates upwards at a large angle.

[0045] Example 3: This embodiment provides a chassis sheet metal spraying processing device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] Please see Figures 1-8 The top of the pad 5124 is provided with a guide groove extending along the axis of the traction rope 53. A guide wheel 6 is rotatably connected in the guide groove. An annular groove is provided on the outer side of the guide wheel 6. The auxiliary support assembly 513 includes: a first spring 5131, the lower end of which is fixed to the top of the outer bracket 511; a support frame 5132, which is fixedly connected to the upper end of the first spring 5131; and a limiting plate 5133, one end of which is rotatably connected to the bottom of the support frame 5132, and the other end passes through the support frame 5132 in a vertical direction and extends to the top of the support frame 5132. The limiting plate 5133 and the support frame 5132 are slidably engaged.

[0047] Working principle: When the traction rope 53 presses the auxiliary support component 513 at an inclined angle, the traction rope 53 pushes the support frame 5132 to rotate until the direction of the support frame 5132 after rotation is the same as the direction of the traction rope 53. When the traction rope 53 moves axially, the traction rope 53 rolls along the guide wheel 6. The direction of the guide wheel 6 and the guide groove can promote the traction rope 53 to move along its axial direction, reducing the possibility of twisting of the traction rope 53 when moving axially. At the same time, the support frame 5132 can better fit the traction rope 53 when the angle of the traction rope 53 changes, increasing the area of ​​the traction rope 53 supported, thereby reducing the degree of damage to the traction rope 53 due to friction.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chassis sheet metal spraying processing device, comprising a base (1), a rear robotic arm (2), and a front robotic arm (3) equipped with a spray gun, characterized in that, It also includes a distributed support assembly (5) disposed on the rear robotic arm (2), the distributed support assembly (5) comprising: The pressure-bearing component (51) is fixedly connected to the frame of the rear robotic arm (2); A traction device (52) is mounted on the pressure-bearing assembly (51); The traction rope (53) has one end fixedly connected to the front-end robotic arm (3), and the connection point is offset from the rotation axis of the front-end robotic arm (3). The other end passes around the pressure-bearing component (51) and is connected to the traction device (52). The traction device (52) is used to apply traction force to the traction rope (53), so that the traction rope (53) generates a torque on the front end robotic arm (3) pointing towards the rear end robotic arm (2). When the traction rope (53) is under tension, it squeezes the pressure-bearing component (51) and transmits the reaction force of the tension to the frame of the rear end robotic arm (2) through the pressure-bearing component (51), thereby transferring at least part of the load of the front end robotic arm (3) on the rotating joint to the frame of the rear end robotic arm (2).

2. The chassis sheet metal spraying processing device according to claim 1, characterized in that, The pressure-bearing component (51) includes: An external support (511) is fixed to the side of the rear robotic arm (2) away from the front robotic arm (3); The main support assembly (512) is located above the first motor (4) and is elastically mounted on the top of the outer bracket (511); An auxiliary support assembly (513) is elastically mounted on the end of the outer bracket (511) away from the front-end robotic arm (3); When the traction rope (53) applies tension to the traction device (52), it squeezes the main support assembly (512) to cause it to elastically contract and presses against the auxiliary support assembly (513).

3. The chassis sheet metal spraying processing device according to claim 2, characterized in that, The auxiliary support component (513) includes: The first spring (5131) has its lower end fixed to the top of the outer bracket (511); The support frame (5132) is fixedly connected to the upper end of the first spring (5131); The limiting plate (5133) has one end rotatably connected to the bottom of the support frame (5132), and the other end passes through the support frame (5132) in the vertical direction and extends to the top of the support frame (5132). The limiting plate (5133) and the support frame (5132) are slidably engaged.

4. The chassis sheet metal spraying processing device according to claim 2, characterized in that, The main support component (512) includes: At least two sliding frames (5121) are provided, which are slidably connected to the outer bracket (511); The lifting block (5122) is slidably connected to the side wall of the sliding frame (5121). The top of the outer bracket (511) is provided with a sliding groove for the lifting block (5122) to slide. The lifting block (5122) extends from the inside of the outer bracket (511) through the sliding groove to the outside of the outer bracket (511). The second spring (5123) has one end connected to the sliding frame (5121) and the other end connected to the lifting block (5122); The pad (5124) is fixed to the top of the lifting block (5122).

5. The chassis sheet metal spraying processing device according to claim 4, characterized in that, The top of the pad (5124) is provided with a guide groove extending along the axis of the traction rope (53), and a guide wheel (6) is rotatably connected in the guide groove. An annular groove is provided on the outer side of the guide wheel (6).

6. The chassis sheet metal spraying processing device according to claim 4, characterized in that, The outer support (511) is provided with an intermediate plate (7), which is located between the two sliding frames (5121). The intermediate plate (7) is rotatably connected to the lifting block (5122) by a connecting rod (8).

7. The chassis sheet metal spraying processing device according to claim 6, characterized in that, The outer support (511) is provided with a lifting frame (9), and the bottom of the middle plate (7) is fixedly connected with at least two limiting rods (10). The limiting rods (10) pass through the lifting frame (9) in the vertical direction and slide with the lifting frame (9). The connecting rod (8) is provided with a protruding post, which extends into the lifting frame (9) and abuts against the inner wall of the lifting frame (9).

8. The chassis sheet metal spraying processing device according to claim 1, characterized in that, The traction device (52) includes an outer frame, a winding rod, and a second motor. The outer frame is fixed to the pressure-bearing assembly (51). The winding rod is rotatably connected inside the outer frame, and its axis is perpendicular to the extension direction of the traction rope (53). The second motor is fixed to the outer frame and is used to drive the winding rod to rotate. One end of the traction rope (53) is fixedly connected to the winding rod.

9. The chassis sheet metal spraying processing device according to claim 1, characterized in that, A tension sensor (11) is connected in series on the traction rope (53). The tension sensor (11) is used to detect the traction force applied to the traction rope (53) by the traction device (52).

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