Welding tool for middle of excavator main frame

Abstract

The invention discloses an excavator main frame middle welding tool and belongs to the field of welding equipment.The excavator main frame middle welding tool comprises a supporting seat and a main frame, a sleeve is fixedly connected to the outer surface of the upper end of the supporting seat, a bracket is rotatably connected to the outer surface of the sleeve, and a second hydraulic rod is fixedly connected to the outer surface of the upper end of the supporting seat; a lifting assembly used for placing the main frame is arranged on the upper side of the second hydraulic rod and comprises a rotating wheel fixedly connected with the upper end of the second hydraulic rod. The lifting assembly is arranged, a first hydraulic rod and a second hydraulic rod are matched, the first hydraulic rod in the lifting process can jack up one end of the main frame upwards, meanwhile, the first hydraulic rod is matched with the other set of first hydraulic rod to enable the angle of the main frame to be turned over, and therefore the angle of the main frame is flexibly adjusted, and welding machining can be better conducted on different positions; therefore, the difficulty and the risk of adjusting the position of the main frame can be effectively reduced, and further the welding processing flexibility can be improved.

Description

Technical Field

[0001] The invention relates to the field of welding equipment, and more specifically to a middle welding tool for an excavator main frame. Background Art

[0002] The main frame of the excavator arm is a key component of the excavator working device. It is mainly used to control the excavation and loading of the bucket. It adopts a box-type structure and is welded by two upper and lower cover plates and two side wall panels. In the production process, in order to improve the welding efficiency, welding tools are usually used to assist the welding process; For example, the Chinese patent with the announcement number CN219094157U discloses a welding tool for the rear support of the excavator arm. The device can realize the rapid positioning of the sleeve, side plate and connecting plate of the rear support workpiece by setting components such as the bottom plate and the support plate. After the positioning is completed, preliminary welding and fixing can be carried out, and finally the complete welding is carried out to form a finished product, thereby improving the welding accuracy of the excavator structure to a certain extent; The welding tooling in the prior art can improve the welding accuracy of the workpiece to a certain extent by clamping and positioning the workpiece. Then, during the welding process of the excavator boom main frame, the angle of the main frame needs to be flipped according to the welding position and angle. In actual operation, due to the heavy weight of the main frame, the operator usually uses a workshop crane with a steel cable to lift the main frame, and then places the main frame on the welding tooling again after flipping the angle. In this process, not only the operating procedures are cumbersome, but also the main frame has the risk of tipping over and sliding during the lifting process due to the unbalanced center of gravity, which poses a certain safety hazard. At the same time, during the secondary placement of the main frame, the position of the main frame needs to be calibrated again, which will reduce the welding efficiency of the main frame. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a welding tool for the middle part of the main frame of an excavator. By setting a lifting assembly, through the cooperation of hydraulic rod one and hydraulic rod two, hydraulic rod one in the rising process will lift one end of the main frame upward, and at the same time cooperate with another group of hydraulic rods to flip the angle of the main frame, so as to flexibly adjust the angle of the main frame, so as to better perform welding processing on different positions, thereby effectively reducing the difficulty and risk of adjusting the position of the main frame, and then helping to improve the flexibility of welding processing.

[0004] To solve the above problems, the present invention adopts the following technical solutions.

[0005] A welding tool for the middle part of an excavator main frame, comprising a support seat and a main frame, wherein a sleeve is fixedly connected to the outer surface of the upper end of the support seat, a bracket is rotatably connected to the outer surface of the sleeve, a hydraulic rod 2 is fixedly connected to the outer surface of the upper end of the support seat, and a lifting assembly for placing the main frame is arranged on the upper side of the hydraulic rod 2; The lifting assembly includes a rotating wheel fixedly connected to the upper end of hydraulic rod 2, the outer surface of the rotating wheel is rotatably connected to a clamping seat, the upper inner surface of the clamping seat is fixedly connected to a fixed seat, the upper outer surface of the bracket is fixedly connected to hydraulic rod 1, the upper end of hydraulic rod 1 is fixedly connected to a top block, the outer surface of the top block is provided with a guide groove, the inner surface of the guide groove is slidably connected to a guide block, the upper outer surface of the guide block is fixedly connected to a support plate, and the upper outer surface of the support plate is in contact with the lower surface of the main frame.

[0006] Furthermore, the clamping seat has a U-shaped structure, the number of hydraulic rods 1 is two and they are symmetrically distributed on the left and right sides of hydraulic rod 2, the outer surface of the upper end of the top block is arc-shaped, the outer surface of the upper end of the fixed seat is arc-shaped, and hydraulic rod 2 is located inside the sleeve.

[0007] Furthermore, a rotating component for driving the main frame to rotate is provided on the outside of the sleeve, and the rotating component includes a support sleeve fixedly connected to the outer surface of the upper end of the support seat, the upper end of the support sleeve is rotatably connected to the outer surface of the lower end of the bracket, the outer surface of the upper end of the bracket is fixedly connected to a mounting sleeve, the lower end of the mounting sleeve passes through the lower side of the bracket, the inner surface of the mounting sleeve is fixedly connected to a movable rod, the outer surface of the movable rod is rotatably connected to a ball, the number of the mounting sleeve, the movable rod and the ball are all in two groups and are symmetrically distributed, and the lower side of the outer surface of the ball is in rolling contact with the outer surface of the upper end of the support seat.

[0008] Furthermore, a positioning hole is opened on the outer surface of the upper end of the support seat, and the number of the positioning holes is several groups and is evenly distributed. A positioning pin is slidably connected to the outer surface of the bracket, and the lower end of the positioning pin passes through the positioning hole to the inner side of the support seat. The positioning pin is a T-shaped structure, and the number of the positioning pins is two groups.

[0009] Furthermore, a baffle is fixedly connected to the outer surface of the second output rod of the hydraulic rod, a clamping block is fixedly connected to the outer surface of the lower end of the baffle, and a limiting block is fixedly connected to the inner surface of the sleeve. The limiting blocks are divided into several groups and distributed in a ring array, and the clamping block is engaged between two adjacent groups of limiting blocks.

[0010] Furthermore, a sliding groove is provided through the middle of the outer surface of the upper end of the fixed seat, and a clamp is slidably connected to the inner side of the sliding groove. The number of the clamps is two groups and they are symmetrically distributed. The lower end of the clamp passes through the lower side of the sliding groove and is fixedly connected to a movable plate. The outer surface of the lower end of the movable plate is slidably connected to the lower end of the inner surface of the clamping seat, and an electric push rod is fixedly connected between the two groups of movable plates. The outer surface of the right end of the clamping seat is provided with scale lines.

[0011] Furthermore, a lifting assembly for lifting one end of the main frame is provided on the outer side of the support plate, and the lifting assembly includes a mounting groove opened on the outer surface of the support plate, a pin shaft is fixedly connected to the inner side of the mounting groove, an extrusion plate is rotatably connected to the outer surface of the pin shaft, a tension spring is fixedly connected to the outer surface of the extrusion plate close to the top block, and the tension spring is fixedly connected to the outer surface of the lower end of the support plate at one end away from the extrusion plate.

[0012] Furthermore, a positioning component for calibrating the position of the main frame is provided on the outer side of the extrusion plate, and the positioning component includes a capsule fixedly connected to the outer surface of the extrusion plate, and the outer surface of the capsule is in contact with the outer surface of the main frame away from the extrusion plate. The capsule is made of elastic high-temperature resistant material, and the number of the extrusion plates and capsules is two groups and is symmetrically distributed on the left and right sides of the main frame.

[0013] Furthermore, a piston cavity is embedded on the inner side of the extrusion plate, a partition is fixedly connected to the middle part of the inner surface of the piston cavity, a piston plate is slidably connected to the inner surface of the piston cavity, an end of the piston plate away from the partition is fixedly connected to a push rod, an end of the push rod away from the piston plate penetrates to the outside of the extrusion plate and is slidably connected to the extrusion plate, an end of the push rod away from the piston plate is fixedly connected to a contact plate, an outer surface of the contact plate away from the push rod is in contact with the main frame, a catheter is fixedly connected to the outer surface of the bladder body, and the catheter is communicated with the inside of the piston cavity.

[0014] Furthermore, the number of the piston plates, push rods and contact plates are two groups and are symmetrically distributed front to back. The contact plates are made of high temperature resistant material. The side of the support plate away from the pin shaft is fixedly connected to a mounting frame, and the outer surface of the upper end of the mounting frame is in contact with the lower end of the main frame.

[0015] Compared with the prior art, the advantages of the present invention are: (1) This solution sets a lifting assembly, and through the cooperation of hydraulic rod 1 and hydraulic rod 2, hydraulic rod 1 in the rising process will push up one end of the main frame, and at the same time cooperate with another set of hydraulic rods to flip the angle of the main frame, so as to flexibly adjust the angle of the main frame, so as to better perform welding processing at different positions, thereby effectively reducing the difficulty and risk of adjusting the position of the main frame, and thus helping to improve the flexibility of welding processing; (2) This solution sets a rotating assembly. During the rotation of the bracket, the balls are driven to roll along the surface of the support seat. The rotation of the balls not only makes the bracket rotate more smoothly, but also the two groups of symmetrically distributed balls can share part of the pressure on the bracket, reducing the probability of deformation of the bracket due to excessive force, thereby keeping the position of the hydraulic rod accurate, which helps to improve the adjustment accuracy of the main frame position. (3) This solution sets a positioning assembly and drives the contact plate to fit into contact with the inner surface of the main frame through a push rod, thereby limiting the main frame. By clamping and positioning the main frame in different directions, the stability and reliability of the main frame placed on the surface of the welding tooling can be effectively improved, thereby further improving the welding accuracy of the excavator main frame and helping to reduce the probability of the main frame shifting during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 It is a top view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Middle AA section view; Figure 4 For the present invention Figure 2 Middle BB section view; Figure 5 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 6 For the present invention Figure 3 The enlarged schematic diagram at C in the middle; Figure 7 For the present invention Figure 4 The enlarged schematic diagram at D in the middle; Figure 8 For the present invention Figure 5 Enlarged schematic diagram at point E in the middle.

[0017] Description of the numbers in the figure: 11. Support seat; 12. Positioning hole; 13. Support sleeve; 14. Bracket; 15. Positioning pin; 16. Mounting sleeve; 17. Movable rod; 18. Ball; 19. Hydraulic rod one; 20. Casing; 21. Baffle plate; 22. Clamping seat; 23. Main frame; 24. Hydraulic rod two; 25. Guide groove; 26. Clamp plate; 27. Rotating wheel; 28. Limit block; 29. ​​Block; 30. Movable plate; 31. Electric push rod; 32. Slide groove; 33. Fixed seat; 34. Top block; 35. Tension spring; 36. Support plate; 37. Extrusion plate; 38. Partition plate; 39. Pin shaft; 40. Mounting groove; 41. Contact plate; 42. Push rod; 43. Piston plate; 44. Piston chamber; 45. Catheter; 46. Capsule; 47. Mounting frame; 48. Scale line; 49. Guide block. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 8 A welding tool for the middle part of an excavator main frame, comprising a support seat 11 and a main frame 23, wherein a sleeve 20 is fixedly connected to the outer surface of the upper end of the support seat 11, a bracket 14 is rotatably connected to the outer surface of the sleeve 20, a hydraulic rod 24 is fixedly connected to the outer surface of the upper end of the support seat 11, and a lifting assembly for placing the main frame 23 is arranged on the upper side of the hydraulic rod 24; The lifting assembly includes a rotating wheel 27 fixedly connected to the upper end of the hydraulic rod 24, the outer surface of the rotating wheel 27 is rotatably connected to the clamping seat 22, the upper inner surface of the clamping seat 22 is fixedly connected to the fixing seat 33, the upper outer surface of the bracket 14 is fixedly connected to the hydraulic rod 19, the upper end of the hydraulic rod 19 is fixedly connected to the top block 34, the outer surface of the top block 34 is provided with a guide groove 25, the inner surface of the guide groove 25 is slidably connected to the guide block 49, the upper outer surface of the guide block 49 is fixedly connected to the support plate 36, and the upper outer surface of the support plate 36 is in contact with the lower surface of the main frame 23.

[0020] The clamping seat 22 has a U-shaped structure, the hydraulic rod 1 19 is in two groups and is symmetrically distributed on the left and right sides of the hydraulic rod 2 24 , the upper outer surface of the top block 34 is arc-shaped, the upper outer surface of the fixed seat 33 is arc-shaped, and the hydraulic rod 2 24 is located inside the sleeve 20 .

[0021] By adopting the above technical solution, the position and angle of the main frame 23 of the excavator boom need to be adjusted according to the welding position and angle during the welding process. In order to improve the welding efficiency and welding accuracy, welding tooling is usually used for auxiliary welding. During operation, the support seat 11 is placed on the ground to stably support the welding tooling. The support seat 11 fixedly supports the hydraulic rod 24. The hydraulic rod 24 rotatably supports the clamping seat 22 through the rotating wheel 27, so that the clamping seat 22 can rotate in the horizontal direction, and then the main frame 23 is hoisted on the surface of the fixed seat 33 inside the clamping seat 22, and the main frame 23 is lifted in the middle of the main frame 23 by the fixed seat 33. The support seat 11 rotatably supports the bracket 14 through the sleeve 20, so that the bracket 14 can rotate with the sleeve 20 as the fulcrum. 14 pairs of hydraulic rods 19 are used for lifting and supporting. A guide groove 25 is provided on the surface of a top block 34 fixedly connected to the upper end of the hydraulic rod 19. The top block 34 is slidably connected to the guide block 49 through the guide groove 25, so that the top block 34 is movably connected to the support plate 36 through the guide block 49. When the placement angle of the main frame 23 is adjusted, one group of hydraulic rods 19 is extended upward and the other group of hydraulic rods 19 is retracted downward. At this time, the hydraulic rods 19 in the rising process will lift one end of the main frame 23 upward, and cooperate with the other group of hydraulic rods 19 to flip the angle of the main frame 23, so as to flexibly adjust the angle of the main frame 23, so as to better perform welding processing on different positions, thereby effectively reducing the difficulty of adjusting the position of the main frame 23, and thus helping to improve the flexibility of welding processing.

[0022] like Figure 1 , Figure 4 and Figure 5 As shown, a rotating component for driving the main frame 23 to rotate is provided on the outside of the sleeve 20, and the rotating component includes a support sleeve 13 fixedly connected to the outer surface of the upper end of the support seat 11, and the upper end of the support sleeve 13 is rotatably connected to the outer surface of the lower end of the bracket 14, and the outer surface of the upper end of the bracket 14 is fixedly connected with a mounting sleeve 16, and the lower end of the mounting sleeve 16 passes through the lower side of the bracket 14, and the inner surface of the mounting sleeve 16 is fixedly connected with a movable rod 17, and the outer surface of the movable rod 17 is rotatably connected with a ball 18, and the number of the mounting sleeve 16, the movable rod 17 and the ball 18 are all two groups and are symmetrically distributed, and the lower side of the outer surface of the ball 18 is in rolling contact with the outer surface of the upper end of the support seat 11.

[0023] The outer surface of the upper end of the support seat 11 is provided with positioning holes 12, and the number of the positioning holes 12 is several groups and is evenly distributed. The outer surface of the bracket 14 is slidably connected with a positioning pin 15, and the lower end of the positioning pin 15 passes through the positioning hole 12 to the inner side of the support seat 11. The positioning pin 15 is a T-shaped structure, and the number of the positioning pin 15 is two groups.

[0024] The outer surface of the output rod of the hydraulic rod 24 is fixedly connected with a baffle 21, the outer surface of the lower end of the baffle 21 is fixedly connected with a clamping block 29, the inner surface of the sleeve 20 is fixedly connected with a limit block 28, the number of the limit blocks 28 is several groups and distributed in a ring array, and the clamping block 29 is engaged between two adjacent groups of limit blocks 28.

[0025] By adopting the above technical solution, in order to improve the convenience of adjusting the position of the main frame 23, a rotating assembly is set. When working, the operator first lifts the hydraulic rod 19 and the hydraulic rod 24 upward synchronously. The output end of the hydraulic rod 24 will drive the baffle plate 21 to move synchronously during the rising process, so that the baffle plate 21 drives the block 29 to move synchronously so that the block 29 is out of contact with the limit block 28 inside the sleeve 20. The sleeve 20 supports and limits the annular limit block 28. Then the operator takes the positioning pin 15 out of the positioning hole 12, and then the operator uses the sleeve to The tube 20 is a fulcrum for rotating the bracket 14. The support sleeve 13 is connected to the bracket 14 by rotation, and can support the bracket 14 in the vertical direction. The bracket 14 is fixedly supported by the mounting sleeve 16 on the movable rod 17, and the movable rod 17 is used to support the ball 18 by rotation. During the rotation of the bracket 14, the ball 18 will be driven to roll along the surface of the support seat 11. The rotation of the ball 18 can not only make the rotation of the bracket 14 more stable, but also the two groups of symmetrically distributed balls 18 can share part of the pressure on the bracket 14, reducing the bracket 14 due to excessive force The probability of deformation due to large size is reduced, so that the position of the hydraulic rod 19 is kept accurate. During the rotation process, the bracket 14 drives the main frame 23 to move synchronously through the hydraulic rod 19. At this time, the rotating wheel 27 is connected to the clamping seat 22 through rotation, so that the clamping seat 22 can rotate with the rotating wheel 27 as a fulcrum, thereby driving the main frame 23 to rotate through the fixed seat 33 inside the clamping seat 22. After the main frame 23 rotates to an appropriate position, the hydraulic rod 19 and the hydraulic rod 24 are moved downward synchronously, and the baffle plate 21 is driven to move downward synchronously through the hydraulic rod 24. At this time, the baffle plate 21 The lower block 29 will be engaged between the limit blocks 28 again, thereby limiting the position of the sleeve 20, and then the positioning pin 15 will be inserted into the positioning hole 12 on the surface of the support seat 11 from the upper side of the bracket 14 again, and the bracket 14 will be locked and fixed through the positioning hole 12 and the positioning pin 15. This can not only keep the bracket 14 stable during the welding process, thereby improving the stability of the main frame 23 during the welding process, but also improve the convenience of the main frame 23 during the rotation operation, and at the same time effectively reduce the risk of the main frame 23 during the lifting and flipping process.

[0026] like Figure 1 and Figure 6As shown, a slide groove 32 is provided through the middle of the outer surface of the upper end of the fixed seat 33, and a clamping plate 26 is slidably connected to the inner side of the slide groove 32. The number of the clamping plates 26 is two groups and they are symmetrically distributed. The lower end of the clamping plate 26 passes through the lower side of the slide groove 32 and is fixedly connected to a movable plate 30. The outer surface of the lower end of the movable plate 30 is slidably connected to the lower end of the inner surface of the clamping seat 22. An electric push rod 31 is fixedly connected between the two groups of the movable plates 30. A scale line 48 is provided on the outer surface of the right end of the clamping seat 22.

[0027] By adopting the above technical solution, after the main frame 23 is placed on the upper side of the fixed seat 33, in order to further improve the placement stability of the main frame 23, the electric push rod 31 is started and operated, and the two groups of movable plates 30 are driven by the electric push rod 31 to move toward each other. At this time, the movable plate 30 will drive the clamping plate 26 to move synchronously, and the sliding groove 32 on the surface of the fixed seat 33 can play a sliding guiding role for the clamping plate 26, so that the movement of the clamping plate 26 is more stable, and the front and rear ends of the main frame 23 are clamped by the two groups of clamping plates 26, so that the stability of the main frame 23 during welding and angle adjustment can be improved to a certain extent, which helps to reduce the probability of accidental tipping of the main frame 23 during movement, and further helps to improve the reliability of the welding tooling during use, and by comparing the position of the movable plate 30 with the scale line 48 on the surface of the clamping seat 22, the moving position of the movable plate 30 can be compared, and further the moving accuracy of the movable plate 30 can be effectively improved.

[0028] like Figure 7 As shown, a lifting assembly for lifting one end of the main frame 23 is provided on the outer side of the support plate 36, and the lifting assembly includes a mounting groove 40 opened on the outer surface of the support plate 36, and a pin shaft 39 is fixedly connected to the inner side of the mounting groove 40, and an extrusion plate 37 is rotatably connected to the outer surface of the pin shaft 39, and a tension spring 35 is fixedly connected to the outer surface of the extrusion plate 37 on the side close to the top block 34, and the tension spring 35 is fixedly connected to the outer surface of the lower end of the support plate 36 at one end away from the extrusion plate 37.

[0029] By adopting the above technical scheme, during the process of the support plate 36 being in contact with the outer surface of the lower end of the main frame 23, the mounting groove 40 opened on the surface of the support plate 36 is used to fix and support the pin shaft 39, and the extrusion plate 37 is rotatably supported by the pin shaft 39. The extrusion plate 37 will be located at the side of the main frame 23 under the elastic force of the tension spring 35, and the support plate 36 pulls and supports the tension spring 35. Through the two groups of extrusion plates 37, the left and right ends of the main frame 23 can be provided with auxiliary support, thereby further improving the stability and reliability of the main frame 23 during the placement process. At the same time, the extrusion plate 37 can also play a certain limiting role on the main frame 23, thereby reducing the deformation of the steel plate during the welding process of the main frame 23, which helps to improve the welding processing accuracy of the main frame 23.

[0030] like Figure 5, Figure 7 and Figure 8 As shown, a positioning component for calibrating the position of the main frame 23 is provided on the outside of the extrusion plate 37, and the positioning component includes a capsule 46 fixedly connected to the outer surface of the extrusion plate 37, and the outer surface of the capsule 46 is in contact with the outer surface of the main frame 23 away from the extrusion plate 37. The capsule 46 is made of elastic high-temperature resistant material. The number of the extrusion plates 37 and the capsule 46 is two groups and is symmetrically distributed on the left and right sides of the main frame 23.

[0031] A piston cavity 44 is embedded in the inner side of the extrusion plate 37, a partition 38 is fixedly connected to the middle of the inner surface of the piston cavity 44, a piston plate 43 is slidably connected to the inner surface of the piston cavity 44, an end of the piston plate 43 away from the partition 38 is fixedly connected to a push rod 42, an end of the push rod 42 away from the piston plate 43 penetrates to the outside of the extrusion plate 37 and is slidably connected to the extrusion plate 37, an end of the push rod 42 away from the piston plate 43 is fixedly connected to a contact plate 41, an outer surface of the contact plate 41 away from the push rod 42 is in contact with the main frame 23, an outer surface of the capsule 46 is fixedly connected to a catheter 45, and the catheter 45 is communicated with the inside of the piston cavity 44.

[0032] The piston plates 43, push rods 42 and contact plates 41 are provided in two groups and are symmetrically distributed front to back. The contact plates 41 are made of high temperature resistant material. A mounting frame 47 is fixedly connected to the side of the support plate 36 away from the pin shaft 39. The outer surface of the upper end of the mounting frame 47 is in contact with the lower end of the main frame 23.

[0033] By adopting the above technical solution, when the extrusion plate 37 drives the bladder 46 to fit and contact with the outer surface of the main frame 23, the extrusion plate 37 cooperates with the main frame 23 to squeeze the bladder 46, and the partition 38 inside the piston chamber 44 divides the piston chamber 44 into two parts. At this time, the gas inside the bladder 46 will enter the piston chamber 44 through the conduit 45, and the piston plate 43 inside the piston chamber 44 is pushed by the gas, thereby driving the push rod 42 to move to the side away from the partition 38 through the piston plate 43, so that the push rod 42 drives the contact plate 41 to fit and contact with the inner surface of the main frame 23, thereby limiting the main frame 23. By clamping and positioning the main frame 23 in different directions, the stability and reliability of the main frame 23 placed on the surface of the welding tooling can be effectively improved, thereby further improving the welding accuracy of the excavator main frame 23, and helping to reduce the probability of the main frame 23 shifting during the welding process.

[0034] Instructions for use: During operation, the main frame 23 is hoisted on the surface of the fixing seat 33 inside the clamping seat 22, and the main frame 23 is lifted in the middle of the main frame 23 by the fixing seat 33. The front and rear ends of the main frame 23 are clamped by two sets of clamping plates 26, so as to improve the stability of the main frame 23 during welding and angle adjustment to a certain extent. The mounting groove 40 provided on the surface of the supporting plate 36 is used to fix and support the pin shaft 39, and the extrusion plate 37 is rotatably supported by the pin shaft 39. The extrusion plate 37 will be located at the side of the main frame 23 under the elastic force of the tension spring 35. When the extrusion plate 37 drives the capsule 46 to fit and contact with the outer surface of the main frame 23, the piston plate 43 drives the push rod 42 to move to the side away from the partition 38. Thereby, the push rod 42 drives the contact plate 41 to fit into contact with the inner surface of the main frame 23, so as to limit the main frame 23. During the rotation, the bracket 14 will drive the main frame 23 to move synchronously through the hydraulic rod 19. During the rotation, the bracket 14 will drive the ball 18 to roll along the surface of the support seat 11. The rotation of the ball 18 can not only make the rotation of the bracket 14 more stable, but also extend one set of hydraulic rods 19 upward and retract the other set of hydraulic rods 19 downward. At this time, the hydraulic rod 19 in the rising process will push up one end of the main frame 23, and cooperate with the other set of hydraulic rods 19 to flip the angle of the main frame 23, so as to flexibly adjust the angle of the main frame 23.

[0035] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding tool for the middle part of an excavator main frame, comprising a support seat (11) and a main frame (23), characterized in that: The outer surface of the upper end of the support seat (11) is fixedly connected to a sleeve (20), the outer surface of the sleeve (20) is rotatably connected to a bracket (14), the outer surface of the upper end of the support seat (11) is fixedly connected to a second hydraulic rod (24), and a lifting assembly for placing a main frame (23) is provided on the upper side of the second hydraulic rod (24); The lifting assembly comprises a rotating wheel (27) fixedly connected to the upper end of hydraulic rod 2 (24); the outer surface of the rotating wheel (27) is rotatably connected to a clamping seat (22); the upper inner surface of the clamping seat (22) is fixedly connected to a fixing seat (33); the upper outer surface of the bracket (14) is fixedly connected to hydraulic rod 1 (19); the upper end of the hydraulic rod 1 (19) is fixedly connected to a top block (34); the outer surface of the top block (34) is provided with a guide groove (25); the inner surface of the guide groove (25) is slidably connected to a guide block (49); the upper outer surface of the guide block (49) is fixedly connected to a support plate (36); the upper outer surface of the support plate (36) is in close contact with the lower surface of the main frame (23).

2. The middle welding tool for the main frame of an excavator according to claim 1, characterized in that: The clamping seat (22) is of a U-shaped structure. The number of the hydraulic rods (19) is two and they are symmetrically distributed on the left and right sides of the hydraulic rod (24). The upper outer surface of the top block (34) is in the shape of an arc. The upper outer surface of the fixed seat (33) is in the shape of an arc. The hydraulic rod (24) is located inside the sleeve (20).

3. The middle welding tool for the main frame of an excavator according to claim 2, characterized in that: A rotating assembly for driving the main frame (23) to rotate is arranged on the outside of the sleeve (20), and the rotating assembly comprises a support sleeve (13) fixedly connected to the outer surface of the upper end of the support seat (11), the upper end of the support sleeve (13) is rotatably connected to the outer surface of the lower end of the bracket (14), the upper end of the bracket (14) is fixedly connected to the outer surface of the upper end of the bracket (14), the lower end of the mounting sleeve (16) passes through the lower side of the bracket (14), the inner surface of the mounting sleeve (16) is fixedly connected to a movable rod (17), the outer surface of the movable rod (17) is rotatably connected to a ball (18), the number of the mounting sleeve (16), the movable rod (17) and the ball (18) are all two groups and are symmetrically distributed, and the lower side of the outer surface of the ball (18) is in rolling contact with the outer surface of the upper end of the support seat (11).

4. The middle welding tool for the main frame of an excavator according to claim 3 is characterized by: The upper outer surface of the support seat (11) is provided with positioning holes (12), the number of the positioning holes (12) being several groups and being evenly distributed, the outer surface of the bracket (14) being slidably connected with a positioning pin (15), the lower end of the positioning pin (15) passing through the positioning hole (12) to the inner side of the support seat (11), the positioning pin (15) being in a T-shaped structure, the number of the positioning pin (15) being two groups.

5. The middle welding tool for the main frame of an excavator according to claim 4, characterized in that: The outer surface of the output rod of the second hydraulic rod (24) is fixedly connected to a baffle plate (21), the outer surface of the lower end of the baffle plate (21) is fixedly connected to a clamping block (29), and the inner surface of the sleeve (20) is fixedly connected to a limit block (28), the limit blocks (28) are provided in a plurality of groups and are distributed in a ring-shaped array, and the clamping block (29) is clamped between two adjacent groups of limit blocks (28).

6. The middle welding tool for the main frame of an excavator according to claim 5, characterized in that: A slide groove (32) is provided through the middle of the outer surface of the upper end of the fixed seat (33), and a clamping plate (26) is slidably connected to the inner side of the slide groove (32). The number of the clamping plates (26) is two groups and they are symmetrically distributed. The lower end of the clamping plate (26) passes through the lower side of the slide groove (32) and is fixedly connected to a movable plate (30). The outer surface of the lower end of the movable plate (30) is slidably connected to the lower end of the inner surface of the clamping seat (22). An electric push rod (31) is fixedly connected between the two groups of movable plates (30). A scale mark (48) is provided on the outer surface of the right end of the clamping seat (22).

7. The middle welding tool for the main frame of an excavator according to claim 6, characterized in that: A lifting assembly for lifting one end of the main frame (23) is arranged on the outer side of the support plate (36), and the lifting assembly includes a mounting groove (40) formed on the outer surface of the support plate (36), a pin shaft (39) is fixedly connected to the inner side of the mounting groove (40), an extrusion plate (37) is rotatably connected to the outer surface of the pin shaft (39), a tension spring (35) is fixedly connected to the outer surface of the extrusion plate (37) on the side close to the top block (34), and an end of the tension spring (35) away from the extrusion plate (37) is fixedly connected to the outer surface of the lower end of the support plate (36).

8. The middle welding tool for the main frame of an excavator according to claim 7, characterized in that: A positioning assembly for calibrating the position of the main frame (23) is arranged on the outside of the extrusion plate (37), and the positioning assembly includes a capsule (46) fixedly connected to the outer surface of the extrusion plate (37), and the outer surface of the capsule (46) is in close contact with the outer surface of the main frame (23) on the side away from the extrusion plate (37), and the capsule (46) is made of an elastic high-temperature resistant material. The number of the extrusion plates (37) and the capsule (46) is two groups and they are symmetrically distributed on the left and right sides of the main frame (23).

9. The middle welding tool for the main frame of an excavator according to claim 8, characterized in that: A piston cavity (44) is embedded in the inner side of the extrusion plate (37), a partition plate (38) is fixedly connected to the middle of the inner surface of the piston cavity (44), a piston plate (43) is slidably connected to the inner surface of the piston cavity (44), a push rod (42) is fixedly connected to the end of the piston plate (43) away from the partition plate (38), the end of the push rod (42) away from the piston plate (43) penetrates to the outside of the extrusion plate (37) and is slidably connected to the extrusion plate (37), a contact plate (41) is fixedly connected to the end of the push rod (42) away from the piston plate (43), the outer surface of the contact plate (41) away from the push rod (42) is in close contact with the main frame (23), and a catheter (45) is fixedly connected to the outer surface of the capsule (46), and the catheter (45) is connected to the inside of the piston cavity (44).

10. The middle welding tool for the main frame of an excavator according to claim 9, characterized in that: The piston plate (43), the push rod (42) and the contact plate (41) are each provided in two groups and are symmetrically distributed front to back. The contact plate (41) is made of a high temperature resistant material. A mounting frame (47) is fixedly connected to a side of the support plate (36) away from the pin shaft (39). The outer surface of the upper end of the mounting frame (47) is in close contact with the lower end of the main frame (23).

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