Excavator frame skirt assembly welding tool and use method thereof

Abstract

The present application discloses a welding tool for an excavator frame skirt assembly and a method for using the same. The linkage mechanism is detachably connected to a first placement frame, the first screw rod and the second screw rod are threadedly connected to a bracket, the bracket is slidably connected to a placement seat, the placement seat is rotatably connected to a second placement frame, and a limiting mechanism is provided between the second placement frame and the placement seat. After the left and right skirts are placed on the corresponding second placement frames, the center frame is fixed to the first placement frame. After starting the servo motor, the second placement frame will move along the first and second screw rods toward the center frame position. After the left and right skirts come into contact with the center frame, they can be welded. After front welding, the servo motor is started again, and the first placement frame will move along with the arc frame, thereby adjusting the welding position. The left and right skirts can be welded to the back of the center frame. This arrangement allows efficient welding.

Description

Technical Field

[0001] The present application relates to the field of vehicle frame welding technology, and in particular to an excavator vehicle frame skirt assembly welding tool and a method of using the tool. Background Art

[0002] An excavator, also known as a backhoe, is an earth-moving machine that uses its bucket to dig up materials above or below the surface and load them onto transport vehicles or unload them into a stockpile. Excavators primarily dig soil, coal, silt, and pre-loosened soil and rock. In recent years, the development of construction machinery has seen relatively rapid growth, making excavators one of the most essential machines in engineering construction. The three most important excavator parameters are operating weight, engine power, and bucket capacity.

[0003] During the production of excavators, the skirt group of the excavator's upper frame needs to be assembled and welded. During assembly, the skirt group needs to be hoisted, aligned, and then spot welded and fixed. Only after fixation can normal welding be performed. However, this method is inefficient and the welding position cannot be adjusted at will, which leads to a decrease in the overall production efficiency. Summary of the Invention

[0004] One of the purposes of the present application is to provide an excavator frame skirt assembly welding tool and a method of using the same.

[0005] To achieve the above objectives, the technical solution adopted in the present application is: a welding tool for an excavator frame skirt assembly, comprising a machine tool, a first placement frame, a second placement frame and a welding head, the machine tool is provided with a fixed seat, the fixed seat is detachably connected to a servo motor, the output end of the servo motor is detachably connected to a first screw rod, the first screw rod is provided with a linkage rod, the other end of the linkage rod is detachably connected to a second screw rod, the second screw rod is rotatably connected to the fixed seat on the other side of the machine tool, the linkage rod is connected through the linkage mechanism, the linkage mechanism is detachably connected to the first placement frame, the first screw rod and the second screw rod are threadedly connected to a bracket, the bracket is slidably connected to the placement seat, the placement seat is rotatably connected to the second placement frame, and a limiting mechanism is provided between the second placement frame and the placement seat.

[0006] Preferably, the first placement rack on the linkage mechanism is flush with the second placement rack on the placement seat, the brackets on the placement seat are arranged vertically on the machine tool, the brackets on both sides are parallel to each other, and the first screw and the second screw on the brackets on both sides have different rotation directions.

[0007] Preferably, a sliding rod is provided on the placement seat, and the sliding rod is horizontally arranged at the tail end of the placement seat. A bracket is slidably connected to the sliding rod, and a first spring is sleeved on the sliding rod. The first spring is located on the sliding rod between the bracket and the placement seat, and one end of the first spring is disassembled and connected to the bracket, and the other end of the first spring is disassembled and connected to the placement seat.

[0008] Preferably, the limiting mechanism includes a socket, a push rod is provided in the socket, an insertion rod is provided on the placement seat corresponding to the push rod, a baffle is provided on the insertion rod, the insertion rod is inserted into the socket, a second spring is sleeved on the insertion rod, and a corresponding guide groove is provided on the second placement rack corresponding to the insertion rod.

[0009] Preferably, the socket is horizontally opened on the second placement rack, the diameter of the socket is the same as the diameter of the top rod in the socket, the top rod in the socket is arranged along the length of the socket, the guide groove on the second placement rack is arranged in an arc shape as a whole, the insertion rod is slidably connected in the corresponding guide groove, and the guide grooves are respectively opened on the upper and lower sides of the second placement rack.

[0010] Preferably, the diameter of the insertion rod is the same as the diameter of the socket, the diameter of the baffle on the insertion rod is larger than the diameter of the insertion rod, and the second spring is located on the insertion rod between the baffle and the placement seat.

[0011] Preferably, the linkage rod is provided with a side groove, and a side frame is slidably connected in the side groove, and the side frame is removably connected to the slide seat, and the slide seat is slidably connected to the linkage rod, and the slide seat is provided with an inner plate, and the inner plate is removably connected to a rubber pad, and the other end of the rubber pad is removably connected to an outer plate, and the outer plate is slidably connected to the slide seat, and a top frame is overlapped on the outer plate, and the top frame is removably connected to the corresponding bracket, and the diameters of the first and second screw rods connected to the bracket are larger than the diameter of the linkage rod, and a third spring is sleeved on the linkage rod between the slide seat and the corresponding first and second screw rods, and one end of the third spring is removably connected to the corresponding slide seat, and the other end of the third spring is removably connected to the corresponding first and second screw rods.

[0012] Preferably, the linkage mechanism includes an arc-shaped frame, a limiting groove is provided on the arc-shaped frame, a guide wheel is inserted in the limiting groove, the guide wheel is rotatably connected to the corresponding support, a rotating rod is rotatably connected to the support, the rotating rod is arranged at both ends of the gear, the gear is meshed and connected to the gear ring, the gear ring is welded to the arc-shaped frame, a through opening is provided on the rotating rod, and frame grooves are provided on the upper and lower sides of the through opening.

[0013] Preferably, a corresponding linkage rod is connected through the through opening, the side frame on the linkage rod corresponds to the frame slot, the side frame is inserted into the corresponding frame slot, and a guide frame is provided on the machine tool at both ends of the arc frame, and the arc frame is inserted into the guide frame.

[0014] To achieve the above objectives, another technical solution adopted in this application is: a method for using an excavator frame skirt assembly welding tool, comprising the following steps:

[0015] S1: First, fix the left and right skirts of the skirt group to the second placement racks on both sides, then fix the center rack to the first placement rack and start the servo motor. The first screw rod connected to the servo motor rotates the second screw rod through the linkage rod. The brackets on the first and second screw rods can move along the first and second screw rods toward the first placement rack, and the left and right skirts can move closer to the center rack.

[0016] S2: After approaching, weld the front weld first. After welding is completed, start the servo motor. The servo motor continues to rotate. At this time, the side frame can be inserted into the frame slot, and the gear can be driven. The gear can drive the arc frame to move as a whole. When the arc frame moves, the position of the first placement frame can be adjusted, the center frame and the skirts on both sides can be adjusted, and the weld on the back can be welded.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The present invention relates to a welding tool for an excavator frame skirt assembly and a method for using the same. After placing the left and right skirts on the second placement racks on both sides, the center rack is placed on the first placement rack. After starting the servo motor, the left and right skirts will move toward the center rack position. After contact, welding can be performed. After front welding, the servo motor is started again, and the side racks can be inserted into the rack slots to drive the gears to rotate. The gears will drive the overall movement of the arc-shaped rack, thereby changing the position of the first placement rack. The first placement rack can rotate coaxially with the second placement rack, so that the back weld can be welded after the position is changed. The setting can facilitate the fixing of the upper frame skirt assembly and the welding at different positions, thereby improving the welding efficiency.

[0019] The invention relates to an excavator frame skirt assembly welding tool and a use method thereof. By providing a side groove on a linkage rod, a side frame can be installed in the side groove. When the side frame is not inserted into the frame groove, the gear does not rotate. As the side frame moves along the side groove, the side frame will be inserted into the frame groove, thereby driving the gear to rotate. The gear will drive the arc frame to move, thereby realizing the circular motion of the arc frame, and the arc frame can rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0021] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0022] Figure 3 Schematic diagram of the connection of the servo motor in the present invention.

[0023] Figure 4 Schematic diagram of the connection of the support in the present invention.

[0024] Figure 5 For the present invention Figure 2 Schematic diagram of the enlarged structure of area A in the middle.

[0025] Figure 6 For the present invention Figure 3 Schematic diagram of the enlarged structure of area B in the middle.

[0026] Figure 7 For the present invention Figure 4 Schematic diagram of the enlarged structure of the middle C area.

[0027] In the figure: 1, machine tool; 2, welding head; 3, first placement rack; 4, placement seat; 5, bracket; 6, fixed seat; 7, guide frame; 8, slide bar; 9, first spring; 10, first screw rod; 11, second screw rod; 12, second placement rack; 13, limit mechanism; 131, guide groove; 132, ejector rod; 133, socket; 134, baffle; 135, second spring; 136, insertion rod; 14 , servo motor; 15. Top frame; 16. Third spring; 17. Outer plate; 18. Rubber pad; 19. Inner plate; 20. Slide; 21. Side frame; 22. Linkage rod; 23. Side groove; 24. Support; 25. Linkage mechanism; 251. Frame groove; 252. Through port; 253. Rotating rod; 254. Gear; 255. Guide wheel; 256. Gear ring; 257. Limiting groove; 258. Arc frame. DETAILED DESCRIPTION

[0028] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0031] like Figures 1 to 7 As shown, the present invention provides an excavator frame skirt assembly welding tool, including a machine tool 1, a first placement frame 3, a second placement frame 12 and a welding head 2, a fixed seat 6 is provided on the machine tool 1, the fixed seat 6 is detachably connected to the servo motor 14, the output end of the servo motor 14 is detachably connected to the first screw rod 10, the first screw rod 10 is provided with a linkage rod 22, the other end of the linkage rod 22 is detachably connected to the second screw rod 11, the second screw rod 11 is rotatably connected to the fixed seat 6 on the other side of the machine tool 1, the linkage rod 22 is connected to the linkage mechanism 25, the linkage mechanism 25 is detachably connected to the first placement frame 3, the first screw rod 10 and the second screw rod 11 are threadedly connected to the bracket 5, the bracket 5 is slidably connected to the placement seat 4, the placement seat 4 is rotatably connected to the second placement frame 12, and a limiting mechanism 13 is provided between the second placement frame 12 and the placement seat 4. After placing the left and right skirts on the corresponding second placement racks 12, the center rack is fixed on the first placement rack 3. After starting the servo motor 14, the second placement rack 12 will move toward the center rack position along the first screw rod 10 and the second screw rod 11. The left and right skirts can be welded after contacting the center rack. After front welding, start the servo motor 14 again, and the first placement rack 3 will move with the arc rack 258, so that the welding position can be adjusted, and the left and right skirts can be welded to the back of the center rack. Efficient welding can be achieved through the setting.

[0032] The first placement rack 3 on the linkage mechanism 25 is flush with the second placement rack 12 on the placement seat 4. The brackets 5 on the placement seat 4 are arranged vertically on the machine tool 1, and the brackets 5 on both sides are parallel to each other. The first and second screw rods 10 and 11 on the two sides of the brackets 5 have different rotation directions. The brackets 5 are arranged so that the brackets 5 can move along the first and second screw rods 10 and 11. When the first and second screw rods 10 and 11 have different rotation directions, the brackets 5 will move closer to or away from each other.

[0033] The placement seat 4 is provided with a slide bar 8, which is horizontally arranged at the rear end of the placement seat 4. The slide bar 8 is slidably connected to the bracket 5. The slide bar 8 is sleeved with a first spring 9. The first spring 9 is located on the slide bar 8 between the bracket 5 and the placement seat 4. One end of the first spring 9 is detachably connected to the bracket 5, and the other end of the first spring 9 is detachably connected to the placement seat 4. By arranging the slide bar 8 on the placement seat 4, the bracket 5 will move along the slide bar 8. After the second placement rack 12 is overlapped with the first placement rack 3 and welded to the front, the servo motor 14 needs to be turned on again to adjust the position. The bracket 5 will continue to move. When the bracket 5 moves, it will move along the slide bar 8, thereby preventing the bracket 5 from driving the second placement rack 12 to continue moving, thereby avoiding obstruction of the movement trajectory.

[0034] The limiting mechanism 13 includes a socket 133, within which a push rod 132 is disposed. A corresponding insertion rod 136 is provided on the placement seat 4 corresponding to the push rod 132, and a baffle 134 is provided on the insertion rod 136. The insertion rod 136 is inserted into the socket 133, and a second spring 135 is sleeved on the insertion rod 136. A corresponding guide slot 131 is provided on the second placement rack 12 corresponding to the insertion rod 136. Before the second placement rack 12 moves to the position of the first placement rack 3, the second placement rack 12 will not rotate. When the second placement rack 12 moves to the position of the first placement rack 3, the push rod 132 will be pushed by the first placement rack 3, and the push rod 132 will move along the socket 133, thereby pushing the insertion rod 136 out of the socket 133. At this time, the second placement rack 12 can be adjusted and can rotate along with the first placement rack 3.

[0035] The socket 133 is horizontally provided on the second placement rack 12. The diameter of the socket 133 is the same as the diameter of the push rod 132 in the socket 133. The push rod 132 in the socket 133 is arranged along the length of the socket 133. The guide grooves 131 on the second placement rack 12 are generally arranged in an arc shape. The insertion rods 136 are slidably connected in the corresponding guide grooves 131. The guide grooves 131 are respectively provided on the upper and lower sides of the second placement rack 12. The insertion rods 136 can achieve the fixing of the second placement rack 12.

[0036] The diameter of the rod 136 is the same as that of the socket 133. The diameter of the baffle 134 on the rod 136 is larger than that of the rod 136. The second spring 135 is located on the rod 136 between the baffle 134 and the placement seat 4. The second spring 135 can push the rod 136 to move into the socket 133.

[0037] A side groove 23 is provided on the linkage rod 22, and a side frame 21 is slidably connected in the side groove 23. The side frame 21 is removably connected to the slide 20, and the slide 20 is slidably connected to the linkage rod 22. An inner plate 19 is provided on the slide 20, and a rubber pad 18 is removably connected to the inner plate 19. The other end of the rubber pad 18 is removably connected to the outer plate 17, and the outer plate 17 is slidably connected to the slide 20. A top frame 15 is overlapped on the outer plate 17, and the top frame 15 is removably connected to the corresponding bracket 5. The diameter of the first screw rod 10 and the second screw rod 11 connected to the bracket 5 is larger than the diameter of the linkage rod 22. A third spring 16 is sleeved on the linkage rod 22 between the slide 20 and the corresponding first screw rod 10 and second screw rod 11. One end of the third spring 16 is removably connected to the corresponding slide 20, and the other end of the third spring 16 is removably connected to the corresponding first screw rod 10 and second screw rod 11. By opening the side groove 23, the side frame 21 can move along the side groove 23. When the bracket 5 moves, the top frame 15 will first push the slide 20 as a whole. As the bracket 5 moves, the top frame 15 will first contact the outer plate 17. As the bracket 5 moves, the outer plate 17 will move as a whole. The outer plate 17 is set on the slide 20, and the slide 20 can drive the side frame 21 to move into the frame groove 251. When the second placement rack 12 is overlapped on the first placement rack 3, the side frame 21 will be inserted into the end of the frame groove 251 at this time. Position, when the side frame 21 is inserted into the frame groove 251, the servo motor 14 will continue to be turned on to drive the gear 254 to rotate, thereby rotating the arc frame 258. When the side frame 21 moves, the side frame 21 will rotate following the linkage rod 22. The side frame 21 cannot be inserted into the frame groove 251 immediately. When the top frame 15 continues to push the outer plate 17, the outer plate 17 will squeeze the rubber pad 18 through the setting of the rubber pad 18, thereby preventing the hard top of the component. The side frame 21 can be inserted after it is aligned with the frame groove 251.

[0038] The linkage mechanism 25 includes an arcuate frame 258, which has a limiting slot 257 defined therein. A guide wheel 255 is inserted into the limiting slot 257. The guide wheel 255 is rotatably connected to the corresponding support 24. The support 24 is rotatably connected to a rotating rod 253. The rotating rod 253 is disposed at each end of a gear 254, which is meshed with a gear ring 256 welded to the arcuate frame 258. The rotating rod 253 has a through opening 252, with frame slots 251 defined above and below the through opening 252. The limiting slot 257 allows the guide wheel 255 to be connected, thereby limiting the arcuate frame 258, thereby guiding the arcuate frame 258 and causing it to move in a circular motion.

[0039] A corresponding linkage rod 22 extends through the opening 252. The side frames 21 on the linkage rod 22 correspond to the frame slots 251, and the side frames 21 are inserted into the corresponding frame slots 251. Guide frames 7 are provided on the machine tool 1 at both ends of the arc frame 258, and the arc frame 258 is inserted into the guide frames 7. The insertion of the linkage rod 22 is achieved through the linkage rod 22, and the linkage rod 22 will not drive the gear 254 to rotate during the initial rotation.

[0040] like Figure 1-7 As shown, a method for using an excavator frame skirt assembly welding tool comprises the following steps:

[0041] S1: First, fix the left and right skirts of the skirt group to the second placement racks 12 on both sides, then fix the center rack to the first placement rack 3 and start the servo motor 14. The first screw rod 10 connected to the servo motor 14 rotates the second screw rod 11 through the linkage rod 22. The bracket 5 on the first and second screw rods 10 and 11 can move toward the first placement rack 3 along the first and second screw rods 10 and 11, and the left and right skirts can move closer to the center rack;

[0042] S2: After the two sides are brought together, the front weld is welded first. After the welding is completed, the servo motor 14 is started and the servo motor 14 continues to rotate. At this time, the side frame 21 can be inserted into the frame slot 251, and the gear 254 can be driven. The gear 254 can drive the arc frame 258 to move as a whole. When the arc frame 258 moves, the position of the first placement frame 3 can be adjusted, the center frame and the skirts on both sides can be adjusted, and the weld on the back can be welded.

[0043] The working principle of the present invention is as follows: after placing the left and right skirts on the second placement racks 12 on both sides, the center rack is placed on the first placement rack 3. After starting the servo motor 14, the left and right skirts will move toward the center rack position. After contact, welding can be carried out. After the front side is welded, the servo motor 14 is started again, and the side rack 21 can be inserted into the rack groove 251, thereby driving the gear 254 to rotate. The gear 254 will drive the arc rack 258 to move as a whole, thereby changing the position of the first placement rack 3, and the first placement rack 3 can be connected with the second placement rack. The frame 12 rotates coaxially, thereby changing its position and performing welding of the back weld. By providing a side groove 23 on the linkage rod 22, the side frame 21 can be installed in the side groove 23. When the side frame 21 is not inserted into the frame groove 251, the gear 254 does not rotate. As the side frame 21 moves along the side groove 23, the side frame 21 will be inserted into the frame groove 251, thereby driving the gear 254 to rotate, and the gear 254 will drive the arc frame 258 to move, thereby realizing the circular motion of the arc frame 258, and the arc frame 258 can rotate.

[0044] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A welding tool for an excavator frame skirt assembly, comprising a machine tool (1), a first placement rack (3), a second placement rack (12) and a welding head (2), characterized in that: The machine tool (1) is provided with a fixed seat (6), a servo motor (14) is detachably connected to the fixed seat (6), an output end of the servo motor (14) is detachably connected to a first screw rod (10), a linkage rod (22) is provided on the first screw rod (10), the other end of the linkage rod (22) is detachably connected to a second screw rod (11), the second screw rod (11) is rotatably connected to the fixed seat (6) on the other side of the machine tool (1), the linkage rod (22) is connected through the linkage mechanism (25), a first placement rack (3) is detachably connected to the linkage mechanism (25), the first screw rod (10) and the second screw rod (11) are threadedly connected to a bracket (5), the bracket (5) is slidably connected to the placement seat (4 ), the placing seat (4) is rotatably connected to a second placing frame (12), a limiting mechanism (13) is provided between the second placing frame (12) and the placing seat (4), the first placing frame (3) on the linkage mechanism (25) is flush with the second placing frame (12) on the placing seat (4), the bracket (5) on the placing seat (4) is vertically arranged on the machine tool (1), the brackets (5) on both sides are parallel to each other, the first screw rod (10) and the second screw rod (11) on the brackets (5) on both sides have different rotation directions, the placing seat (4) is provided with a slide rod (8), the slide rod (8) is horizontally provided at the tail end of the placing seat (4), the slide rod (8) is slidably connected to the bracket (5), and the slide rod (8) is sleeved with a first elastic member. Spring (9), the first spring (9) is located on the slide bar (8) between the bracket (5) and the placement seat (4), one end of the first spring (9) is detachably connected to the bracket (5), and the other end of the first spring (9) is detachably connected to the placement seat (4), the limiting mechanism (13) includes a socket (133), a top rod (132) is provided in the socket (133), a plug rod (136) is provided on the placement seat (4) corresponding to the top rod (132), a baffle (134) is provided on the plug rod (136), the plug rod (136) is plugged into the socket (133), a second spring (135) is sleeved on the plug rod (136), and the plug rod (136) is provided on the second placement rack (12) corresponding to the second spring (135). A corresponding guide groove (131) is provided, the socket (133) is horizontally provided on the second placement rack (12), the diameter of the socket (133) is the same as the diameter of the top rod (132) in the socket (133), the top rod (132) in the socket (133) is provided along the length of the socket (133), the guide groove (131) on the second placement rack (12) is provided in an arc shape as a whole, the insertion rod (136) is slidably connected in the corresponding guide groove (131), the guide groove (131) is provided on the upper and lower sides of the second placement rack (12), the diameter of the insertion rod (136) is the same as the diameter of the socket (133), the diameter of the baffle (134) on the insertion rod (136) is larger than the diameter of the insertion rod (136),The second spring (135) is located on the insertion rod (136) between the baffle (134) and the placement seat (4), the linkage rod (22) is provided with a side groove (23), the side groove (23) is slidably connected to the side frame (21), the side frame (21) is detachably connected to the slide seat (20), the slide seat (20) is slidably connected to the linkage rod (22), the slide seat (20) is provided with an inner plate (19), the inner plate (19) is detachably connected to a rubber pad (18), the other end of the rubber pad (18) is detachably connected to an outer plate (17), the outer plate (1 7) is slidably connected to the slide (20), a top frame (15) is overlapped on the outer plate (17), and the top frame (15) is detachably connected to the corresponding bracket (5), the diameter of the first screw rod (10) and the second screw rod (11) connected to the bracket (5) is larger than the diameter of the linkage rod (22), and a third spring (16) is sleeved on the linkage rod (22) between the slide (20) and the corresponding first screw rod (10) and the second screw rod (11), and one end of the third spring (16) is detachably connected to the corresponding slide (20), and the other end of the third spring (16) is detachably connected to the corresponding slide (20). One end is detachably connected to the corresponding first screw rod (10) and the second screw rod (11), the linkage mechanism (25) includes an arc frame (258), a limiting groove (257) is provided on the arc frame (258), a guide wheel (255) is inserted into the limiting groove (257), the guide wheel (255) is rotatably connected to the corresponding support (24), the support (24) is rotatably connected to a rotating rod (253), the rotating rod (253) is set at both ends of the gear (254), the gear (254) is meshed and connected to the gear ring (256), the gear The ring (256) is welded to the arc frame (258), the rotating rod (253) is provided with a through opening (252), the through opening (252) is provided with frame grooves (251) on the upper and lower sides, the through opening (252) is connected with a corresponding linkage rod (22), the side frame (21) on the linkage rod (22) corresponds to the frame groove (251), the side frame (21) is inserted into the corresponding frame groove (251), the machine tool (1) at both ends of the arc frame (258) is provided with a guide frame (7), and the arc frame (258) is inserted into the guide frame (7).

2. A method for using a welding tool for an excavator frame skirt assembly, applied to the welding tool according to claim 1, characterized in that: The following steps are involved: S1: First, fix the left and right skirts of the skirt group to the second placement racks (12) on both sides, then fix the center rack to the first placement rack (3), and then start the servo motor (14). The first screw rod (10) connected to the servo motor (14) rotates the second screw rod (11) through the linkage rod (22), and the brackets (5) on the first screw rod (10) and the second screw rod (11) can move along the first screw rod (10) and the second screw rod (11) toward the first placement rack (3), and the left and right skirts can move closer to the center rack; S2: After the two sides are brought together, the front weld is welded first. After the welding is completed, the servo motor (14) is started. The servo motor (14) continues to rotate. At this time, the side frame (21) can be inserted into the frame slot (251), and the gear (254) can be driven. The gear (254) can drive the arc frame (258) to move as a whole. When the arc frame (258) moves, the position of the first placement frame (3) can be adjusted, the center frame and the skirts on both sides can be adjusted, and the weld on the back can be welded.

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