A welding robot arm

Abstract

The invention discloses a welding robot arm, which relates to the technical field of welding, and comprises a connecting arm, a driving arm and a welding head. The connecting arm and the driving arm are rotatably connected via a rotating shaft, a welding head is installed at the lower end of the driving arm, a plurality of equidistant clamping holes are arranged on the surface of the driving arm, and a clamping mechanism can be used to adjust the position of a ring cylinder on the driving arm, so as to facilitate subsequent welding of workpieces with different angles by the welding head, and a ring cylinder is mounted on the driving arm, an inner cylinder is arranged at the middle position of the ring cylinder, a clamping mechanism is arranged on the inner cylinder, and wind grooves are symmetrically opened on the outer wall of the ring cylinder, a bellows is rotatably installed in the wind groove, a preheating mechanism and a cooling mechanism are arranged inside the ring cylinder, and the distance between the blown airflow and the welding head can be adjusted by setting the adjustment component, so as to avoid the airflow blowing away the shielding gas at the welding point, so that the flow rate of the shielding gas is affected, the welding point cannot be effectively covered, and the welding quality is affected.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a welding robot arm. Background Art

[0002] A welding robot is an industrial machine used for welding (including cutting and spraying). According to the International Organization for Standardization (ISO), an industrial robot is a standard welding robot. An industrial robot is a multi-purpose, reprogrammable, automatically controlled manipulator with three or more programmable axes, used in industrial automation.

[0003] Patent CN116460492A discloses a welding robot arm with high working efficiency. Although it solves the problem of providing an air jet structure at the welding head to clean the welding slag after welding, thereby avoiding the presence of welding slag, which reduces the density and strength of welding and seriously affects the welding quality, resulting in the welding position being more fragile and easily damaged during work, the blown air flow is close to the welding head, and the blown air flow will blow away the shielding gas at the welding point, affecting the flow rate of the shielding gas, resulting in the shielding gas being unable to effectively cover the welding area, which will reduce the quality of the weld. Summary of the Invention

[0004] The object of the present invention is to provide a welding robot arm to solve the above-mentioned problems.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: a welding robot arm, including a connecting arm, a driving arm and a welding head, the connecting arm and the driving arm are rotatably connected by a rotating shaft, the welding head is installed at the lower end of the driving arm, the surface of the driving arm is provided with a plurality of equidistant clamping holes, and an annular cylinder is mounted on the driving arm, an inner cylinder is provided in the middle position of the annular cylinder, a clamping mechanism is provided on the inner cylinder, and air grooves are symmetrically opened on the outer wall of the annular cylinder, a bellows is rotatably installed in the air groove, and a preheating mechanism and a cooling mechanism are provided inside the annular cylinder.

[0006] Furthermore, the clamping mechanism includes a connecting column and a clamping rod. The connecting column is fixed on the outer wall of the inner cylinder. The connecting column is hollow and an electromagnet is fixed on the inner bottom. A mounting hole is provided inside the electromagnet. A light receiver is installed inside the mounting hole. The connecting column is slidably connected to the clamping rod. The end of the clamping rod away from the connecting column passes through the inner cylinder and is movably engaged with the clamping hole. A spring is fixed between the clamping rod and the electromagnet, and a through hole is provided at the axis center of the clamping rod.

[0007] Furthermore, a bottom hole is provided at the inner bottom of the clamping hole, a light emitter is installed inside the bottom hole, the clamping rod is provided with a magnetic material at one end close to the electromagnet, and a limit block is fixed at the opening of the connecting column.

[0008] Furthermore, the preheating mechanism includes an upper plate, a lower plate and a heating element. The lower plate is fixedly connected between the annular cylinder and the inner cylinder. The lower plate is circular. Two symmetrically arranged partitions are fixedly connected to the lower plate. The upper plate is arranged above the lower plate and fixed between the two partitions. A through hole is provided on the upper plate. The heating element is installed between the upper plate and the lower plate. The two partitions divide the space between the annular cylinder and the inner cylinder into two. A top cover is installed above the annular cylinder by bolts. One side of the two partitions and the space between the top cover and the upper plate form an upper cavity. The space between the upper plate and the lower plate forms a lower cavity. An air pump is fixedly connected to the top cover, and the air pump is connected to the upper cavity.

[0009] Furthermore, the cooling mechanism includes a cooling cavity and cooling fins. The cooling cavity is the space formed by the other side of the two partitions and the top cover and the lower plate. The cooling fins are placed inside the cooling cavity. There are multiple cooling fins and a connecting pipe is fixedly connected between the multiple cooling fins. A connecting component is provided between the cooling mechanism and the preheating mechanism, and both the cooling mechanism and the preheating mechanism are provided with an adjustment component.

[0010] Furthermore, the connecting component includes motor 2, gears, rack 1 and rack 2, a protection box is fixedly connected to the side wall of the ring cylinder, through groove 1 and through groove 2 are provided on the partition close to the side of the protection box, and two slide grooves are provided on the partition, the two slide grooves respectively pass through through groove 1 and through groove 2, rack 1 slides and engages with through groove 1 through the slide groove, rack 2 slides and engages with through groove 2 through the slide groove, guide rod 1 and guide rod 2 are fixedly connected to the inner wall of the protection box, rack 1 is slidingly connected to guide rod 1 at one end close to the protection box, and rack 2 is slidingly connected to guide rod 2 at one end close to the protection box, motor 2 is fixed to the inside of the protection box, and a gear is fixedly connected to the output end of motor 2, and the gear is meshed with rack 1 and rack 2 respectively.

[0011] Furthermore, the adjusting assembly includes a hose, a worm and a worm wheel. The hose connects the ventilation box and the lower cavity. A connecting shaft is rotatably installed in the air trough. The bellows is fixedly connected to the connecting shaft, and the worm wheel is sleeved on the connecting shaft. The bottom of the ring cylinder is fixedly connected to motor 1 and bracket 1. The output end of motor 1 is fixedly connected to pulley 1. The worm and the pulley are coaxially arranged and the worm and the worm wheel are meshed with each other. A support rod is also fixedly connected to the outer wall of the ring cylinder below the air trough. The worm is rotatably connected between bracket 1 and the support rod. A bevel gear 1 is rotatably installed on the outer wall of the inner cylinder. Two connecting frames are fixed to the bevel gear 1. Two brackets 2 are provided on one side of the motor 1. The two brackets 2 are fixedly connected to the ring cylinder and a pulley 2 is rotatably installed between the two brackets 2. A belt is installed between pulley 1 and pulley 2. A bevel gear 2 is coaxially rotatable on pulley 2, and bevel gear 1 is meshed with bevel gear 2.

[0012] Furthermore, the adjustment component also includes a sliding rod and an air hole. A slot is provided on the top wall of the air trough, and an air hole is provided on the inner wall of the ring tube above the lower plate. The air hole is connected to the slot, and the bottom wall of the slot is fixed with spring 2. The sliding rod is slidably connected to the inside of the slot and one end is fixed with spring 2. The end of the sliding rod away from spring 2 is fixed with a block.

[0013] The present invention has the following beneficial effects:

[0014] 1. Through the setting of the clamping rod and the clamping hole, the ring tube can be installed at different positions of the driving arm. When the angles of the workpieces to be welded are different, the distance between the inner tube and the welding head is adjusted to provide space for welding and avoid interference between the ring tube and the workpiece.

[0015] 2. By setting up the preheating mechanism, the surface of the unwelded workpiece can be preheated, effectively avoiding the stress caused by large temperature changes during welding, which may cause weld deformation or cracks, improve the welding quality, and clean the impurities on the workpiece surface.

[0016] 3. Through the setting of the cooling mechanism, the weld can be cooled down after welding, and the cooling speed of the weld can be increased, thereby ensuring the quality of the weld. At the same time, different cooling temperatures can be provided according to different welding methods and welding materials to avoid weld deformation or cracks and improve welding quality.

[0017] 4. By adjusting the settings of the components, the distance between the blown air flow and the welding head can be adjusted to prevent the air flow from blowing away the shielding gas at the welding point, which will affect the flow of the shielding gas and make it unable to effectively cover the welding point, affecting the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 Schematic diagram of the position of the clamping hole in the present invention;

[0021] Figure 3 Schematic diagram of the internal structure of the clamping hole in the present invention;

[0022] Figure 4 Schematic diagram of the internal structure of the electromagnet in the present invention;

[0023] Figure 5It is a structural schematic diagram of the ring cylinder and the inner cylinder in the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0025] Figure 7 Schematic diagram of the structure of the upper plate and the lower plate in the present invention;

[0026] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0027] Figure 9 For the local adjustment component of the present invention Figure 1

[0028] Figure 10 For the local adjustment component of the present invention Figure 2 ;

[0029] Figure 11 For the local adjustment component of the present invention Figure 3 ;

[0030] Figure 12 Schematic diagram of the structure of the preheating mechanism and the cooling mechanism in the present invention;

[0031] Figure 13 Schematic diagram of the structure of the connection component in the present invention;

[0032] Figure 14 Schematic diagram of the internal structure of the cooling mechanism of the present invention;

[0033] Figure 15 Schematic diagram of the structure of the partition in the present invention;

[0034] Figure 16 This is a structural diagram of a bevel gear in the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1. Connecting arm; 2. Driving arm; 3. Rotating shaft; 4. Welding head; 5. Top cover; 6. Ring cylinder; 7. Protective box; 8. Air pump; 9. Air trough; 10. Bellows; 11. Clamping hole; 12. Bottom hole; 13. Light emitter; 14. Inner cylinder; 15. Connecting column; 16. Electromagnet; 17. Mounting hole; 18. Spring 1; 19. Limit block; 20. Through hole; 21. Clamping rod; 22. Upper plate; 23. Partition; 24. Heating element; 25. Lower plate; 26. Hose; 27. Bevel gear 1; 28. Through hole; 29. ​​Worm; 30. Support rod; 31 , bracket one; 32. belt; 33. pulley one; 34. motor one; 35. bevel gear two; 36. connecting frame; 37. pulley two; 38. bracket two; 39. worm gear; 40. connecting shaft; 41. gear; 42. rack one; 43. through slot one; 44. guide rod one; 45. guide rod two; 46. rack two; 47. motor two; 48. cooling fin; 49. cooling chamber; 50. upper chamber; 51. lower chamber; 52. connecting pipe; 53. slide groove; 54. through slot two; 55. air hole; 56. optical receiver; 57. slide rod; 58. block. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] See also Figure 1-16 As shown, the present invention is a welding robot arm, a welding robot arm, comprising a connecting arm 1, a driving arm 2 and a welding head 4, the connecting arm 1 and the driving arm 2 are rotatably connected by a rotating shaft 3, the welding head 4 is installed at the lower end of the driving arm 2, the surface of the driving arm 2 is provided with a plurality of equidistant clamping holes 11, and the driving arm 2 is sleeved with a ring cylinder 6, the middle position of the ring cylinder 6 is provided with an inner cylinder 14, the inner cylinder 14 is provided with a clamping mechanism, the position of the ring cylinder 6 on the driving arm 2 can be adjusted by the clamping mechanism, so as to facilitate the subsequent welding head 4 to weld workpieces with different angles, and the outer wall of the ring cylinder 6 is symmetrically provided with air grooves 9, a bellows 10 is rotatably installed in the air groove 9, and a preheating mechanism and a cooling mechanism are provided inside the ring cylinder 6, the preheating mechanism can blow out airflow through the bellows 10 to preheat the surface of the unwelded workpiece, and at the same time clean up impurities on the surface of the workpiece, and the cooling mechanism can blow out airflow through the bellows 10 on the other side to cool the weld after welding, and at the same time clean up the welding slag generated after welding.

[0039] The clamping mechanism includes a connecting column 15 and a clamping rod 21. The connecting column 15 is fixed to the outer wall of the inner cylinder 14. The connecting column 15 is hollow and the inner bottom is fixed with an electromagnet 16. The electromagnet 16 has a mounting hole 17 inside. The mounting hole 17 has a light receiver 56 installed inside. The light receiver 56 and the light transmitter 13 are set to control the power supply of the electromagnet 16. The connecting column 15 is slidably connected to the clamping rod 21. The end of the clamping rod 21 away from the connecting column 15 passes through the inner cylinder 14 and is movably engaged with the clamping hole 11. A spring 18 is fixed between the clamping rod 21 and the electromagnet 16, and A through hole 20 is provided at the axis of the card rod 21. The through hole 20 is provided so that the light emitted by the light emitter 13 provided in the card hole 11 can pass through the card rod 21 and be received by the light receiver 56, thereby controlling the power supply of the electromagnet 16. A bottom hole 12 is provided at the inner bottom of the card hole 11. The bottom hole 12 is provided to facilitate the installation of the light emitter 13 without affecting the engagement between the card rod 21 and the card hole 11. The light emitter 13 is installed inside the bottom hole 12. The end of the card rod 21 near the electromagnet 16 is set to be a magnetic material, and the opening of the connecting column 15 is fixedly connected to the limit block 19.

[0040] Since the ring tube 6 is installed on the driving arm 2, the welding head 4 is installed at the lower end of the driving arm 2. When the angle of the workpiece to be welded is small, the ring tube 6 needs to be away from the welding head 4 to provide space for the welding of the welding head 4. Therefore, the position of the ring tube 6 on the driving arm 2 can be adjusted. When the ring tube 6 needs to be installed, the ring tube 6 is slid on the driving arm 2, and after adjusting to a suitable position, the ring tube 6 is rotated so that the clamping rod 21 approaches the clamping hole 11. When the clamping rod 21 and the clamping hole 11 are aligned, the light emitted by the light emitter 13 can pass through the clamping rod 21 and be received by the light receiver 56, thereby cutting off the power to the electromagnet 16. The electromagnet 16 no longer attracts the clamping rod 21, and the clamping rod 21 is clamped into the clamping hole 11 under the action of the spring 18, thereby realizing the movable installation of the ring tube 6.

[0041] The preheating mechanism includes an upper plate 22, a lower plate 25 and a heating element 24. The lower plate 25 is fixedly connected between the annular tube 6 and the inner tube 14. The lower plate 25 is annular. Two symmetrically arranged partitions 23 are fixedly connected to the lower plate 25. The upper plate 22 is arranged above the lower plate 25. The upper plate 22 is a heat-insulating material to isolate the heat of the lower chamber 51 from being transferred to the upper chamber 50. The upper plate 22 is fixed between the two partitions 23. A through hole 28 is provided on the upper plate 22. The heating element 24 is installed between the upper plate 22 and the lower plate 25, and the through hole 28 is provided at a place away from the connection between the air pump 8 and the upper chamber 50. In this way, the upper chamber 50 can be filled with cold air and then transported to the lower chamber 51, while being away from the through slot 1 43 and the through slot 2 54, so as to prevent the hot air in the lower chamber 51 from flowing to the cooling chamber 49 through the through slot 1 43 and the through slot 2 54.

[0042] Two partitions 23 divide the space between the annular tube 6 and the inner tube 14 into two parts. A top cover 5 is installed above the annular tube 6 by bolts. The space between one side of the two partitions 23 and the top cover 5 and the upper plate 22 forms an upper chamber 50. The space between the upper plate 22 and the lower plate 25 forms a lower chamber 51. An air pump 8 is fixed to the top cover 5, and the air pump 8 is connected to the upper chamber 50.

[0043] The preheating mechanism and the cooling mechanism are arranged on both sides of the partition 23. When the driving arm 2 moves to drive the welding head 4 to move and weld the workpiece, or when the workpiece moves relative to the welding head 4 to weld, the air pump 8 is started, and the air pump 8 inputs external air into the upper chamber 50. After the external cold air fills the upper chamber 50, it is then transported to the lower chamber 51 through the through hole 28. The cold air is heated after passing through the heating element 24, and then discharged from the bellows 10 through the hose 26 and blown onto the unwelded workpiece in front of the welding head 4. On the one hand, impurities on the workpiece can be blown away, thereby improving the forming quality of the weld. On the other hand, the welding part of the workpiece can be preheated, effectively avoiding the generation of cracks caused by stress caused by large temperature changes during welding, thereby improving the welding quality.

[0044] The cooling mechanism includes a cooling chamber 49 and cooling fins 48. The cooling chamber 49 is the space formed by the other side of the two partitions 23, the top cover 5, and the lower plate 25. The cooling fins 48 are placed inside the cooling chamber 49. A plurality of cooling fins 48 are provided, and a connecting pipe 52 is fixedly connected between the plurality of cooling fins 48. A connecting component is provided between the cooling mechanism and the preheating mechanism, and the cooling mechanism and the preheating mechanism are both provided with an adjustment component. The cooling fins 48 are filled with cooling liquid, and all the cooling fins 48 are connected through the connecting pipe 52, thereby cooling the hot air entering the cooling chamber 49.

[0045] The connecting component includes motor 2 47, gear 41, rack 1 42 and rack 2 46. A protection box 7 is fixedly connected to the side wall of the ring tube 6. A through groove 1 43 and a through groove 2 54 are provided on the partition 23 close to the side of the protection box 7, and two slide grooves 53 are provided on the partition 23. The two slide grooves 53 respectively penetrate through the through groove 1 43 and the through groove 2 54. The rack 1 42 slides and engages with the through groove 1 43 through the slide groove 53, and the rack 2 46 slides and engages with the through groove 2 54 through the slide groove 53. A guide rod 1 44 and a guide rod 2 45 are fixedly connected to the inner wall of the protection box 7. The end of the rack 1 42 close to the protection box 7 is slidably connected to the guide rod 1 44, and the end of the rack 2 46 close to the protection box 7 is slidably connected to the guide rod 2 45. The motor 2 47 is fixed to the inside of the protection box 7, and the output end of the motor 2 47 is fixedly connected to the gear 41, and the gear 41 is meshed with the rack 1 42 and the rack 2 46 respectively.

[0046] After welding, proper cooling can improve the strength of the weld, but if it is cooled rapidly, it will produce greater thermal stress, causing the weld to deform or crack. Therefore, different welding methods and different welding materials require different cooling temperatures. When warm air is needed for cooling, the motor 2 47 can be started, and the motor 2 47 drives the gear 41 to rotate, and the gear 41 drives the rack 1 42 and the rack 2 46 to slide in the slide groove 53. At this time, the rack 1 42 slides in the direction close to the partition 23, so that the rack 1 42 blocks the through groove 1 43, and the upper cavity 5 0 cannot enter the cooling chamber 49, and the rack 2 46 slides in the direction away from the partition 23, so that the rack 2 46 is disengaged from the through slot 2 54, so that the hot air heated in the lower chamber 51 can flow into the cooling chamber 49 through the through slot 2 54. The hot air is cooled when passing through the cooling fins 48 to form warm air, which is discharged from the bellows 10 through the hose 26 to cool the welding point. Since the top cover 5 and the ring tube 6 are installed by bolts, the cooling fins 48 can be taken out or not according to the required cooling temperature.

[0047] When cooling by cold air is needed, motor 2 47 is started again, and motor 2 47 drives gear 41 to rotate, and gear 41 drives rack 1 42 and rack 2 46 to slide, so that rack 1 42 moves away from through slot 1 43, and through slot 1 43 is opened, so that rack 2 46 slides to block through slot 2 54. At this time, the hot air in the lower cavity 51 cannot enter the cooling cavity 49, while the cold air in the upper cavity 50 can directly enter the cooling cavity 49 through through slot 2 54, and then be discharged from the bellows 10 through the hose 26 to cool the welding position by cold air.

[0048] The adjustment component includes a hose 26, a worm 29 and a worm wheel 39. The hose 26 connects the ventilation box 10 and the lower cavity 51. The hose 26 can adapt to the rotation angle of the bellows 10. A connecting shaft 40 is rotatably installed in the wind groove 9. The bellows 10 is fixed on the connecting shaft 40. The worm wheel 39 is sleeved on the connecting shaft 40. The bottom of the ring tube 6 is fixed with a motor 34 and a bracket 31. The output end of the motor 34 is fixed with a pulley 33. The worm 29 is coaxially arranged with the pulley 33 and the worm 29 is meshed with the worm wheel 39. A support rod 30 is also fixed on the outer wall of the ring tube 6 below the wind groove 9. The worm 29 is rotatably connected between the bracket 31 and the support rod 30, and the outer wall of the inner tube 14 is rotated. A bevel gear 27 is installed, and two connecting frames 36 are fixed on the bevel gear 27. The connection frame 36 is set to avoid the connecting column 15. Two brackets 2 38 are provided on one side of the motor 1 34. The two brackets 2 38 are fixed to the ring cylinder 6 and a pulley 2 37 is rotatably installed between the two brackets 2 38. A belt 32 is installed between the pulley 1 33 and the pulley 2 37. A bevel gear 2 35 is coaxially rotated on the pulley 2 37. The bevel gear 27 is meshed with the bevel gear 2 35. The difference is that the cooling mechanism adjustment component is not provided with a motor 34, and the cooling mechanism adjustment component is provided with two brackets 1 31, and the pulley 1 33 is directly rotatably installed on the two brackets 1 31.

[0049] During shielded welding, shielding gas is sprayed out from the welding head 4 to cover the welding area and ensure the quality of the weld. Although the existing technology uses air blowing to blow the welding slag remaining after welding away from the welding area to improve the density and strength of the welding, the blown air flow is close to the welding head 4, and the blown air flow will disperse the shielding gas at the welding area, affecting the flow rate of the shielding gas, resulting in the shielding gas being unable to effectively cover the welding area, which will reduce the mechanical properties and corrosion resistance of the weld.

[0050] Therefore, the present application sets an air groove 9 and a bellows 10 on the side wall of the ring tube 6, so that the airflow blown out by the bellows 10 is far away from the welding head 4 and has a different direction from the shielding gas ejected by the welding head 4. Therefore, it can effectively prevent the airflow blown out by the bellows 10 from affecting the flow rate of the shielding gas, and at the same time achieve the effects of cooling, preheating and blowing away impurities;

[0051] Furthermore, since different welding methods and welding materials require different flow rates of shielding gas, it is necessary to adapt to different flow rates of shielding gas by adjusting the distance between the air flow blown out through the bellows 10 and the welding head 4 to avoid blowing away the shielding gas. When the distance needs to be adjusted, the motor 34 can be started, and the motor 34 drives the pulley 33 and the coaxially connected worm 29 to rotate. When the worm 29 rotates, it drives the worm wheel 39 to rotate, and the worm wheel 39 drives the connecting shaft 40 to rotate, and the connecting shaft 40 drives the bellows 10 to rotate, so that the angle of the bellows 10 in the preheating mechanism is adjusted to the appropriate angle. When pulley 1 33 rotates, pulley 2 37 is driven to rotate through belt 32. When pulley 2 37 rotates, it drives bevel gear 2 35 to rotate. Bevel gear 2 35 drives bevel gear 1 27 to rotate. The rotation of bevel gear 1 27 drives bevel gear 2 35 in the cooling mechanism to rotate. Then, the bellows 10 in the cooling mechanism is driven to rotate through the coordinated transmission of pulley 1 33, pulley 2 37, worm 29 and worm gear 39, so that the angle of the bellows 10 in the cooling mechanism is adjusted to an appropriate angle, thereby adjusting the distance between the blown airflow and the welding head 4 to avoid affecting the flow of shielding gas and ensure welding quality.

[0052] The adjustment assembly also includes a slide rod 57 and an air hole 55. A slot is provided on the top wall of the air trough 9. An air hole 55 is provided on the inner wall of the annular tube 6 above the lower plate 25. The air hole 55 is connected to the slot. A second spring is fixed to the bottom wall of the slot. The slide rod 57 is slidably connected to the inside of the slot and one end is fixed to the second spring. A block 58 is fixed to the end of the slide rod 57 away from the second spring.

[0053] When gas is filled into the cooling chamber 49 and the lower chamber 51, the air flow will enter the slot through the air hole 55, and the air flow will push the slide rod 57 to overcome the elastic force of the spring 2 and approach the worm gear 39, and use the clamping block 58 to clamp the worm gear 39 to prevent the worm gear 39 from rotating after driving the bellows 10 to rotate an angle.

[0054] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions described in the aforementioned embodiments, any equivalent replacement of some of the technical features therein, and any modification, equivalent replacement, and improvement made are within the scope of protection of the present invention.

[0055] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

Claims

1. A welding robot arm, comprising a connecting arm (1), a driving arm (2) and a welding head (4), wherein the connecting arm (1) and the driving arm (2) are rotatably connected via a rotating shaft (3), and the welding head (4) is installed at the lower end of the driving arm (2), characterized in that: The surface of the driving arm (2) is provided with a plurality of equally spaced clamping holes (11), and a ring cylinder (6) is sleeved on the driving arm (2), an inner cylinder (14) is provided at the middle position of the ring cylinder (6), a clamping mechanism is provided on the inner cylinder (14), and wind grooves (9) are symmetrically opened on the outer wall of the ring cylinder (6), a bellows (10) is rotatably installed in the wind groove (9), and a preheating mechanism and a cooling mechanism are provided inside the ring cylinder (6); The clamping mechanism comprises a connecting column (15) and a clamping rod (21), wherein the connecting column (15) is fixedly connected to the outer wall of the inner cylinder (14), the connecting column (15) is hollow and an electromagnet (16) is fixedly connected to the inner bottom, a mounting hole (17) is provided inside the electromagnet (16), a light receiver (56) is installed inside the mounting hole (17), the connecting column (15) is slidably connected to the clamping rod (21), one end of the clamping rod (21) away from the connecting column (15) passes through the inner cylinder (14) and is movably clamped with the clamping hole (11), a spring (18) is fixedly connected between the clamping rod (21) and the electromagnet (16), and a through hole (20) is provided at the axis of the clamping rod (21); A bottom hole (12) is provided at the inner bottom of the clamping hole (11), a light emitter (13) is installed inside the bottom hole (12), a magnetic material is arranged at one end of the clamping rod (21) close to the electromagnet (16), and a limit block (19) is fixedly connected to the opening of the connecting column (15); The preheating mechanism comprises an upper plate (22), a lower plate (25) and a heating element (24); the lower plate (25) is fixedly connected between the annular cylinder (6) and the inner cylinder (14); the lower plate (25) is annular in shape; two symmetrically arranged partitions (23) are fixedly connected to the lower plate (25); the upper plate (22) is arranged above the lower plate (25) and the upper plate (22) is fixedly connected between the two partitions (23); a through hole (28) is provided on the upper plate (22); and the heating element (24) is mounted between the upper plate (22) and the inner cylinder (14). The two partitions (23) divide the space between the annular tube (6) and the inner tube (14) into two parts. A top cover (5) is installed above the annular tube (6) by bolts. One side of the two partitions (23) and the space between the top cover (5) and the upper plate (22) form an upper chamber (50). The space between the upper plate (22) and the lower plate (25) forms a lower chamber (51). An air pump (8) is fixedly connected to the top cover (5). The air pump (8) is connected to the upper chamber (50).

2. A welding robot arm according to claim 1, characterized in that: The cooling mechanism comprises a cooling cavity (49) and cooling fins (48); the cooling cavity (49) is a space formed by the other side of the two partitions (23) and the top cover (5) and the lower plate (25); the cooling fins (48) are placed inside the cooling cavity (49); a plurality of cooling fins (48) are provided, and a connecting pipe (52) is fixedly connected between the plurality of cooling fins (48); a connecting component is provided between the cooling mechanism and the preheating mechanism, and both the cooling mechanism and the preheating mechanism are provided with an adjusting component.

3. A welding robot arm according to claim 2, characterized in that: The connecting component comprises a second motor (47), a gear (41), a first rack (42) and a second rack (46); a protection box (7) is fixedly connected to the side wall of the annular tube (6); a first through groove (43) and a second through groove (54) are provided on a partition (23) close to a side of the protection box (7); and two slide grooves (53) are provided on the partition (23); the two slide grooves (53) respectively penetrate the first through groove (43) and the second through groove (54); the first rack (42) is slidably engaged with the first through groove (43) through the slide groove (53); the second rack (46) is slidably engaged with the first through groove (43) through the slide groove (53); 3) is slidably engaged with the second through groove (54), the inner wall of the protection box (7) is fixedly connected with a guide rod (44) and a guide rod (45), the end of the rack (42) close to the protection box (7) is slidably connected with the guide rod (44), the end of the rack (46) close to the protection box (7) is slidably connected with the guide rod (45), the motor (47) is fixedly connected to the inside of the protection box (7), and the output end of the motor (47) is fixedly connected with a gear (41), and the gear (41) is meshed with the rack (42) and the rack (46) respectively.

4. A welding robot arm according to claim 2, characterized in that: The regulating assembly comprises a hose (26), a worm (29) and a worm wheel (39); the hose (26) is connected to the air box (10) and the lower chamber (51); a connecting shaft (40) is rotatably mounted in the air slot (9); the air box (10) is fixedly connected to the connecting shaft (40); the worm wheel (39) is sleeved on the connecting shaft (40); a motor (34) and a bracket (31) are fixedly connected to the bottom of the annular cylinder (6); a pulley (33) is fixedly connected to the output end of the motor (34); the worm (29) and the pulley (33) are coaxially arranged and the worm (29) and the worm wheel (39) are meshingly connected; and a motor (34) is provided on the outer wall of the annular cylinder (6) below the air slot (9). A support rod (30) is fixedly connected, and a worm (29) is rotatably connected between a support 1 (31) and the support rod (30). A bevel gear 1 (27) is rotatably mounted on the outer wall of the inner cylinder (14), and two connecting frames (36) are fixedly connected to the bevel gear 1 (27). One side of the motor 1 (34) is provided with two support 2 (38), and the two support 2 (38) are fixedly connected to the annular cylinder (6) and a pulley 2 (37) is rotatably mounted between the two support 2 (38). A belt (32) is installed between the pulley 1 (33) and the pulley 2 (37), and a bevel gear 2 (35) is rotatably mounted on the pulley 2 (37), and the bevel gear 1 (27) is meshingly connected to the bevel gear 2 (35).

5. A welding robot arm according to claim 4, characterized in that: The adjustment assembly further comprises a slide bar (57) and an air hole (55); a slot is provided on the top wall of the wind slot (9); an air hole (55) is provided on the inner wall of the annular tube (6) above the lower plate (25); the air hole (55) is connected to the slot; a second spring is fixedly connected to the bottom wall of the slot; the slide bar (57) is slidably connected inside the slot and one end is fixedly connected to the second spring; and a block (58) is fixedly connected to the end of the slide bar (57) away from the second spring.

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