Robot welding arm for welding

Abstract

The invention relates to the technical field of robot welding arms, and provides a robot welding arm for welding, which comprises a protection plate, the top of the protection plate is fixedly connected with a fixing plate, the side surface of the fixing plate is provided with a driving system, the bottom of the driving system is provided with a mechanical arm, and the bottom of the mechanical arm is provided with a welding head; a fixing device is arranged at the top of the protection plate and comprises a positioning plate, the positioning plate is fixedly connected to the top of the protection plate, and a motor is fixedly connected to the side face of the positioning plate. By means of the technical scheme, the problems that in the prior art, the effect of protecting workers while fixing workpieces is difficult to achieve, stability of the workpieces is difficult to ensure, welding precision is reduced, welding quality is difficult to prevent from being affected by displacement of the workpieces, physical protection is difficult to effectively provide for operators, and the welding quality is affected are solved. And the safety risk problem possibly existing in the welding process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of robotic welding arms, and more specifically, to a robotic welding arm for welding. Background Art

[0002] A robotic arm is a mechanical device with flexible movement and automated operation capabilities, widely used in multiple fields such as industry, manufacturing, healthcare, scientific research, and education. It mimics the structure and functions of a human arm and can perform various complex operations, such as grasping, handling, assembling, welding, spraying, and precision operations. A robotic arm usually consists of multiple joints, a drive system, sensors, and a control system, etc.

[0003] According to a disclosed adjustable welding robotic arm (Publication No.: CN214769899U), it includes a support table, a support base is provided on the support table, a first rotating arm is provided on the support base, a sliding mechanism is provided inside the first rotating arm, the sliding mechanism includes a fixed support plate, a chute is drilled on the fixed support plate, a sliding plate is provided in the chute, a pair of sliding rotating columns are provided on the side of the sliding plate away from the fixed support plate, a pair of fixed blocks are provided on the fixed support plate, a belt is connected between the pair of fixed blocks, and the locking rotating column, the fixed rotating column, and the sliding rotating column are all connected to the belt. However, in the above device, through the cooperation of components such as the support base, the sliding rotating column, and the fixed rotating column, it is difficult to achieve the effect of protecting the staff while fixing the workpiece, it is difficult to ensure the stability of the workpiece, thereby reducing the welding precision, it is difficult to prevent the welding quality from being affected by the displacement of the workpiece, it is difficult to effectively provide physical protection for the operator, and it reduces the possible safety risks during the welding process, and thus improvement is needed. Summary of the Invention

[0004] The present invention provides a robotic welding arm for welding, which solves the problems in the related art that it is difficult to achieve the effect of protecting the staff while fixing the workpiece, it is difficult to ensure the stability of the workpiece, thereby reducing the welding precision, it is difficult to prevent the welding quality from being affected by the displacement of the workpiece, it is difficult to effectively provide physical protection for the operator, and it increases the possible safety risks during the welding process.

[0005] The technical solution of the present invention is as follows: A robotic welding arm for welding, including a protective plate, a fixing plate is fixedly connected to the top of the protective plate, a drive system is arranged on the side of the fixing plate, a robotic arm is arranged at the bottom of the drive system, and a welding head is arranged at the bottom of the robotic arm;

[0006] A fixing device is provided at the top of the protection plate. The fixing device includes a positioning plate which is fixedly connected to the top of the protection plate. A motor is fixedly connected to the side of the positioning plate. The output shaft of the motor is fixedly connected with a bidirectional reciprocating lead screw. A threaded block is threadedly connected to the circumferential surface of the bidirectional reciprocating lead screw. A rotating rod is rotatably connected to the side of the threaded block. One end of the rotating rod away from the threaded block is rotatably connected to a positioning block. A pressing plate is fixedly connected to the bottom of the positioning block. A support rod is fixedly connected to the top of the protection plate. The fixing device includes a protection structure.

[0007] Optionally, the protection structure includes a rotating rod which is fixedly connected to one end of the bidirectional reciprocating lead screw. A gear is fixedly connected to the circumferential surface of the rotating rod. A rotating shaft is rotatably connected to the side of the protection plate. A mounting plate is fixedly connected to the circumferential surface of the rotating shaft. A gear disc is fixedly connected to the circumferential surface of the rotating shaft.

[0008] Optionally, a limiting rod penetrates through the side of the threaded block. One end of the limiting rod is fixedly connected to the side of the positioning plate. The side of the gear meshes with the side of the gear disc. The threaded block and the limiting rod driven by the bidirectional reciprocating lead screw can effectively ensure the precise fixation of the workpiece and avoid the deviation of the workpiece position during the welding process.

[0009] Optionally, a cooling device is provided at the top of the protection plate. The cooling device includes a driving motor which is fixedly connected to the side of a fixing plate. The output shaft of the driving motor is fixedly connected with a rotating shaft. A fixing block is fixedly connected to the circumferential surface of the rotating shaft. A water tank is fixedly connected to the side of the fixing plate. A hose penetrates through the side of the water tank. One end of the hose away from the water tank penetrates through a spray head.

[0010] Optionally, the number of the fixing blocks on the rotating shaft is set to be several and they are arranged in a circumferential array on the circumferential surface of the rotating shaft. The above design can effectively reduce the thermal deformation during the welding process and ensure the accurate size and shape of the welding joint.

[0011] Optionally, the hose is located on the movement track of the fixing block, and the support rod is located on the movement track of the mounting plate. The design of the spray head and the hose can effectively reduce the excessively high temperature that may be generated during the welding process, prevent the welding part from overheating, and thus ensure the welding quality.

[0012] Optionally, a maintenance device is provided at the top of the protection plate. The maintenance device includes a motor A, which is fixedly connected to the side of a fixing plate. The output shaft of the motor A is fixedly connected to a rotating rod A. A semi-gear is fixedly connected to the circumferential surface of the rotating rod A. A support block is slidably connected to the side of the fixing plate. A rack is fixedly connected to the side of the support block. A support plate is fixedly connected to the side of the fixing plate. An oil pump is fixedly connected to the side of the support plate. A nozzle penetrates through the side of the oil pump. The maintenance device includes a recycling structure. The recycling structure includes a collection box. A slide plate is slidably connected to the inner wall of the collection box. A telescopic rod is fixedly connected to the bottom of the slide plate. The bottom of the telescopic rod is fixedly connected to the inner wall of the collection box. A connecting pipe penetrates through the side of the collection box. One end of the connecting pipe away from the collection box penetrates through the side of the oil pump. A one-way valve is provided on the circumferential surface of the connecting pipe.

[0013] Optionally, a switch rod is provided on the side of the oil pump. The control end of the switch rod is located on the movement track of the rack. A return spring is fixedly connected to the circumferential surface of the switch rod. The end of the return spring away from the switch rod is fixedly connected to the side of the oil pump. A spring is fixedly connected to the side of the support block. The end of the spring away from the support block is fixedly connected to a mounting block. The side of the mounting block is fixedly connected to the side of the fixing plate. The design of the spring can make the rack automatically reset, reducing manual intervention.

[0014] Optionally, a compression spring is fixedly connected to the inner wall of the collection box. The end of the compression spring away from the collection box is fixedly connected to the bottom of the slide plate. The side of the semi-gear with tooth blocks meshes with the top of the rack. The design of the semi-gear can achieve intermittent lubrication, reducing costs.

[0015] The working principle and beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, the force of driving the bidirectional reciprocating screw rod to rotate by the motor cooperates with components such as the threaded block, rotating rod, and positioning block in the fixing device, realizing the rotation of the gear disk driven by the rotation of the gear, and then the rotation of the rotating shaft driven by the rotation of the gear disk. The rotation of the rotating shaft drives the mounting plate to rotate. When the mounting plate is displaced to the side of the support rod, it stops rotating, achieving the effect of fixing the workpiece while protecting the staff, ensuring the stability of the workpiece, thereby improving the welding accuracy and preventing the welding quality from being affected by the displacement of the workpiece. It effectively provides physical protection for the operator and reduces the possible safety risks during the welding process.

[0017] 2. In the present invention, the force that drives the rotating shaft to rotate by the driving motor cooperates with components such as the fixed block, water tank, and nozzle in the cooling device, realizing that as the fixed block rolls, the elasticity of the hose will cause the hose to continuously restore its original shape, forming a negative pressure at the outlet of the water tank, enabling the water in the water tank to be sprayed out through the hose and nozzle, achieving the effect of cooling the welding joint, being able to effectively reduce the excessively high temperature that may be generated during welding, preventing the welding part from overheating, thereby ensuring the welding quality and avoiding quality problems caused by too high or too low temperature.

[0018] 3. In the present invention, the force that drives the rotating rod A to rotate by the motor A cooperates with the force and components such as the support block, mounting block, and rack in the maintenance device, realizing that when the toothed side of the half gear meshes with the rack, the rotation of the half gear drives the rack to displace, causing the rack to squeeze the switch rod, thereby starting the oil pump to work, and the lubricating oil inside it is sprayed out through the nozzle, achieving the effect of lubricating the robotic arm while recycling the lubricating oil, which can avoid damage caused by friction, ensure the long-term stable operation of the robotic arm, not only save costs, but also reduce the impact on the environment and reduce the waste of lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above characteristics, technical features, advantages and their implementation manners of the present invention will be further described below in a clear and understandable manner in combination with the drawings in the preferred embodiments.

[0020] Figure 1 It is a three-dimensional external structure schematic diagram of the present invention;

[0021] Figure 2 It is a three-dimensional enlarged structure schematic diagram at the robotic arm of the present invention;

[0022] Figure 3 It is a three-dimensional side view structure schematic diagram at the fixing plate of the present invention;

[0023] Figure 4 It is a three-dimensional side view structure schematic diagram at the mounting plate of the present invention;

[0024] Figure 5 It is a three-dimensional enlarged structure schematic diagram at the gear of the present invention;

[0025] Figure 6 It is a three-dimensional enlarged structure schematic diagram at the rack of the present invention;

[0026] Figure 7 It is a three-dimensional enlarged structure schematic diagram at the nozzle of the present invention;

[0027] Figure 8 It is a three-dimensional side view structure schematic diagram at the oil pump of the present invention.

[0028] In the figure: 101, protective plate; 102, fixing plate; 103, drive system; 104, robotic arm; 105, welding head; 2, fixing device; 201, positioning plate; 202, motor; 203, bi-directional reciprocating lead screw; 204, threaded block; 205, rotating rod; 206, positioning block; 207, pressing plate; 208, limiting rod; 209, rotating rod; 210, gear; 211, rotating shaft; 212, mounting plate; 213, gear disk; 214, support rod; 3, cooling device; 301, drive motor; 302, rotating shaft; 303, fixing block; 304, hose; 305, nozzle; 306, water tank; 4, curing device; 401, motor A; 402, rotating rod A; 403, semi-gear; 404, mounting block; 405, rack; 406, spring; 407, support block; 408, oil pump; 409, support plate; 410, switch rod; 411, return spring; 412, nozzle; 413, collection box; 414, connecting pipe; 415, telescopic rod; 416, compression spring; 417, one-way valve; 418, sliding plate. Detailed implementation manners

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0030] To make the drawings concise, only the parts related to the invention are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, parts with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0031] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0033] Example 1

[0034] Reference Figures 1 to 8 For the first embodiment of the present invention, a robotic welding arm for welding is proposed, which includes a protective plate 101. A fixing plate 102 is fixedly connected to the top of the protective plate 101. A driving system 103 is arranged on the side of the fixing plate 102. A robotic arm 104 is arranged at the bottom of the driving system 103. A welding head 105 is arranged at the bottom of the robotic arm 104;

[0035] A fixing device 2 is arranged on the top of the protective plate 101. The fixing device 2 includes a positioning plate 201. The positioning plate 201 is fixedly connected to the top of the protective plate 101. A motor 202 is fixedly connected to the side of the positioning plate 201. A bidirectional reciprocating lead screw 203 is fixedly connected to the output shaft of the motor 202. A threaded block 204 is threadedly connected to the circumferential surface of the bidirectional reciprocating lead screw 203. A rotating rod 205 is rotatably connected to the side of the threaded block 204. One end of the rotating rod 205 away from the threaded block 204 is rotatably connected to a positioning block 206. A pressing plate 207 is fixedly connected to the bottom of the positioning block 206. A support rod 214 is fixedly connected to the top of the protective plate 101. The fixing device 2 includes a protective structure.

[0036] The protective structure includes a rotating rod 209. The rotating rod 209 is fixedly connected to one end of the bidirectional reciprocating lead screw 203. A gear 210 is fixedly connected to the circumferential surface of the rotating rod 209. A rotating shaft 211 is rotatably connected to the side of the protective plate 101. A mounting plate 212 is fixedly connected to the circumferential surface of the rotating shaft 211. A gear disc 213 is fixedly connected to the circumferential surface of the rotating shaft 211.

[0037] A limiting rod 208 penetrates through the side of the threaded block 204. One end of the limiting rod 208 is fixedly connected to the side of the positioning plate 201. The side of the gear 210 meshes with the side of the gear disc 213. The threaded block 204 and the limiting rod 208 driven by the bidirectional reciprocating lead screw 203 can effectively ensure the precise fixation of the workpiece and avoid the deviation of the workpiece position during the welding process.

[0038] In this embodiment, the present application drives the bi-directional reciprocating lead screw 203 to rotate through the motor 202, and then drives the two threaded blocks 204 to move towards each other through the rotation of the bi-directional reciprocating lead screw 203. The threaded blocks 204 are limited by the limiting rods 208 on the sides of the threaded blocks 204. The rotation of the threaded blocks 204 drives the rotating rod 205 to rotate, and then the rotation of the rotating rod 205 drives the positioning block 206 to move downward. The displacement of the positioning block 206 drives the pressing plate 207 to move, realizing the function of fixing the workpiece and preventing the position of the workpiece from shifting during the welding process. The rotation of the bi-directional reciprocating lead screw 203 drives the rotating rod 209 to rotate, and then the rotation of the rotating rod 209 drives the gear 210 to rotate. The rotation of the gear 210 drives the gear disc 213 to rotate, and then the rotation of the gear disc 213 drives the rotating shaft 211 to rotate. The rotation of the rotating shaft 211 drives the mounting plate 212 to rotate. When the mounting plate 212 moves to the side of the support rod 214, it stops rotating, realizing the function of protecting the staff during the welding process.

[0039] Embodiment 2

[0040] Referring to Figures 1 to 8 , which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that:

[0041] A cooling device 3 is provided at the top of the protection plate 101. The cooling device 3 includes a driving motor 301. The driving motor 301 is fixedly connected to the side of the fixing plate 102. The output shaft of the driving motor 301 is fixedly connected to a rotating shaft 302. A fixing block 303 is fixedly connected to the circumferential surface of the rotating shaft 302. A water tank 306 is fixedly connected to the side of the fixing plate 102. A hose 304 penetrates through the side of the water tank 306. One end of the hose 304 away from the water tank 306 penetrates through a nozzle 305.

[0042] The number of the fixing blocks 303 on the rotating shaft 302 is set to be several, and they are arranged in a circumferential array on the circumferential surface of the rotating shaft 302. The above design can effectively reduce the thermal deformation during the welding process and ensure the accuracy of the size and shape of the welding joint.

[0043] The hose 304 is located on the movement track of the fixing block 303, and the support rod 214 is located on the movement track of the mounting plate 212. The designs of the nozzle 305 and the hose 304 can effectively reduce the excessively high temperature that may be generated during the welding process, prevent the welding part from overheating, and thus ensure the welding quality.

[0044] Compared with Embodiment 1, further, the drive motor 301 drives the rotating shaft 302 to rotate, and then the rotation of the rotating shaft 302 drives the fixed block 303 to rotate. By continuously squeezing the hose 304 with the fixed block 303, the hose 304 is alternately squeezed and released to pump the fluid. As the fixed block 303 rolls, the elasticity of the hose 304 causes the hose 304 to continuously return to its original shape, creating a negative pressure at the outlet of the water tank 306, so that the water in the water tank 306 is sprayed out through the hose 304 and the nozzle 305, achieving the effect of cooling the welded joint.

[0045] Embodiment 3

[0046] Refer to Figures 1 to 8 , which is the third embodiment of the present invention. The difference between this embodiment and the first embodiment is:

[0047] A maintenance device 4 is provided at the top of the protection plate 101. The maintenance device 4 includes a motor A401. The motor A401 is fixedly connected to the side of the fixing plate 102. The output shaft of the motor A401 is fixedly connected to a rotating rod A402. A semi-gear 403 is fixedly connected to the circumferential surface of the rotating rod A402. A support block 407 is slidably connected to the side of the fixing plate 102. A rack 405 is fixedly connected to the side of the support block 407. A support plate 409 is fixedly connected to the side of the fixing plate 102. An oil pump 408 is fixedly connected to the side of the support plate 409. A nozzle 412 penetrates through the side of the oil pump 408. The maintenance device 4 includes a recycling structure. The recycling structure includes a collection box 413. A sliding plate 418 is slidably connected to the inner wall of the collection box 413. A telescopic rod 415 is fixedly connected to the bottom of the sliding plate 418. The bottom of the telescopic rod 415 is fixedly connected to the inner wall of the collection box 413. A connecting pipe 414 penetrates through the side of the collection box 413. One end of the connecting pipe 414 away from the collection box 413 penetrates through the side of the oil pump 408. A one-way valve 417 is provided on the circumferential surface of the connecting pipe 414.

[0048] A switch rod 410 is provided on the side of the oil pump 408. The control end of the switch rod 410 is located on the movement track of the rack 405. A return spring 411 is fixedly connected to the circumferential surface of the switch rod 410. One end of the return spring 411 away from the switch rod 410 is fixedly connected to the side of the oil pump 408. A spring 406 is fixedly connected to the side of the support block 407. One end of the spring 406 away from the support block 407 is fixedly connected to a mounting block 404. The side of the mounting block 404 is fixedly connected to the side of the fixing plate 102. The design of the spring 406 can make the rack 405 automatically reset, reducing manual intervention.

[0049] The inner wall of the collection box 413 is fixedly connected with a compression spring 416. One end of the compression spring 416 away from the collection box 413 is fixedly connected to the bottom of the sliding plate 418. The side of the semi-gear 403 with teeth is meshed with the top of the rack 405. The design of the semi-gear 403 can achieve intermittent lubrication and reduce costs.

[0050] Compared with Embodiment 1, further, the motor A401 drives the rotating rod A402 to rotate, and then the rotating rod A402 drives the semi-gear 403 to rotate. When the side of the semi-gear 403 with teeth is meshed with the rack 405, the semi-gear 403 drives the rack 405 to displace, so that the rack 405 presses the switch rod 410, and thus the oil pump 408 starts to work. The lubricating oil inside it is sprayed out through the nozzle 412, and the excess lubricating oil drips into the collection box 413. When enough lubricating oil is collected, the sliding plate 418 displaces downward due to gravity. When the sliding plate 418 displaces to the bottom of the connecting pipe 414, the lubricating oil enters the oil pump 408 again through the connecting pipe 414, realizing the function of lubricating the robotic arm 104 and recycling the lubricating oil at the same time.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A robot welding arm for welding, characterized in that: Comprising a protective plate (101), the top of the protective plate (101) being fixedly connected to a fixing plate (102), a driving system (103) being arranged on the side of the fixing plate (102), a mechanical arm (104) being arranged at the bottom of the driving system (103), and a welding head (105) being arranged at the bottom of the mechanical arm (104); A fixing device (2) is provided at the top of the protective plate (101), and the fixing device (2) comprises a positioning plate (201), the positioning plate (201) is fixedly connected to the top of the protective plate (101), a motor (202) is fixedly connected to the side of the positioning plate (201), an output shaft of the motor (202) is fixedly connected to a bidirectional reciprocating screw (203), a threaded block (204) is threadedly connected to the circumferential surface of the bidirectional reciprocating screw (203), a rotating rod (205) is rotatably connected to the side of the threaded block (204), an end of the rotating rod (205) away from the threaded block (204) is rotatably connected to a positioning block (206), a pressing plate (207) is fixedly connected to the bottom of the positioning block (206), and a support rod (214) is fixedly connected to the top of the protective plate (101), and the fixing device (2) comprises a protective structure.

2. A robot welding arm for welding according to claim 1, characterized in that: The protective structure comprises a rotating rod (209), the rotating rod (209) being fixedly connected to one end of a bidirectional reciprocating screw rod (203), the circumferential surface of the rotating rod (209) being fixedly connected to a gear (210), the side surface of the protective plate (101) being rotatably connected to a rotating shaft (211), the circumferential surface of the rotating shaft (211) being fixedly connected to a mounting plate (212), and the circumferential surface of the rotating shaft (211) being fixedly connected to a gear plate (213).

3. A robot welding arm for welding according to claim 2, characterized in that: A limiting rod (208) passes through the side surface of the threaded block (204); one end of the limiting rod (208) is fixedly connected to the side surface of the positioning plate (201); and the side surface of the gear (210) meshes with the side surface of the gear plate (213).

4. A robot welding arm for welding according to claim 3, characterized in that: A cooling device (3) is arranged on the top of the protective plate (101), and the cooling device (3) comprises a driving motor (301), the driving motor (301) is fixedly connected to the side of the fixing plate (102), the output shaft of the driving motor (301) is fixedly connected to the rotating shaft (302), the circumferential surface of the rotating shaft (302) is fixedly connected to a fixing block (303), the side of the fixing plate (102) is fixedly connected to a water tank (306), a hose (304) penetrates the side of the water tank (306), and a nozzle (305) penetrates the end of the hose (304) away from the water tank (306).

5. A robot welding arm for welding according to claim 4, characterized in that: The number of the fixed blocks (303) of the rotating shaft (302) is set to be a plurality and arranged in an array along the circumference on the circumferential surface of the rotating shaft (302).

6. A robot welding arm for welding according to claim 5, characterized in that: The hose (304) is located on the movement track of the fixing block (303), and the support rod (214) is located on the movement track of the mounting plate (212).

7. A robot welding arm for welding according to claim 6, characterized in that: A maintenance device (4) is provided on the top of the protective plate (101), and the maintenance device (4) comprises a motor A (401), the motor A (401) is fixedly connected to the side of the fixed plate (102), the output shaft of the motor A (401) is fixedly connected to a rotating rod A (402), the circumferential surface of the rotating rod A (402) is fixedly connected to a half gear (403), the side of the fixed plate (102) is slidably connected to a support block (407), the side of the support block (407) is fixedly connected to a rack (405), the side of the fixed plate (102) is fixedly connected to a support plate (409), the side of the support plate (409) is fixedly connected to an oil pump (408), and the side of the oil pump (408) is penetrated by a nozzle (412), and the maintenance device (4) comprises a recovery structure.

8. A robot welding arm for welding according to claim 7, characterized in that: The recovery structure comprises a collection box (413), the inner wall of the collection box (413) is slidably connected to a slide plate (418), the bottom of the slide plate (418) is fixedly connected to a telescopic rod (415), the bottom of the telescopic rod (415) is fixedly connected to the inner wall of the collection box (413), a connecting pipe (414) penetrates the side of the collection box (413), one end of the connecting pipe (414) away from the collection box (413) penetrates the side of the oil pump (408), and a one-way valve (417) is provided on the circumferential surface of the connecting pipe (414).

9. A robot welding arm for welding according to claim 8, characterized in that: A switch rod (410) is provided on the side of the oil pump (408), the control end of the switch rod (410) is located on the motion track of the rack (405), a return spring (411) is fixedly connected to the circumferential surface of the switch rod (410), one end of the return spring (411) away from the switch rod (410) is fixedly connected to the side of the oil pump (408), a spring (406) is fixedly connected to the side of the support block (407), one end of the spring (406) away from the support block (407) is fixedly connected to the mounting block (404), and the side of the mounting block (404) is fixedly connected to the side of the fixing plate (102).

10. A robot welding arm for welding according to claim 9, characterized in that: A compression spring (416) is fixedly connected to the inner wall of the collection box (413); one end of the compression spring (416) away from the collection box (413) is fixedly connected to the bottom of the slide plate (418); and one side of the half gear (403) with the tooth block is meshed with the top of the rack (405).

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