A welding tooling for the middle part of the main frame of an excavator

Abstract

The present invention discloses a welding tooling for the middle part of an excavator main frame, belonging to the field of welding equipment, including a support base and a main frame. The outer surface of the upper end of the support base is fixedly connected with a sleeve, and the outer surface of the sleeve is rotatably connected with a bracket. The outer surface of the upper end of the support base is fixedly connected with a second hydraulic rod. A lifting assembly for placing the main frame is arranged above the second hydraulic rod. The lifting assembly includes a runner fixedly connected to the upper end of the second hydraulic rod. By setting the lifting assembly, the first hydraulic rod and the second hydraulic rod cooperate. During the rising process, the first hydraulic rod will jack up one end of the main frame, and at the same time, cooperate with another group of first hydraulic rods to make the angle of the main frame flip, so as to flexibly adjust the angle of the main frame, so as to better carry out welding processing at different positions, thereby effectively reducing the difficulty and risk of adjusting the position of the main frame, and further contributing to improving the flexibility of welding processing.

Description

Technical Field

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

[0002] The main frame of the boom of an excavator is a key component of the working device of the excavator, mainly used to control the excavation, loading and other actions of the bucket. It adopts a box structure and is welded by two upper and lower cover plates and two side wall plates. During the production process, in order to improve the welding efficiency, welding tooling is usually used to assist in the welding process;

[0003] For example, Chinese Patent No. CN219094157U discloses a welding tooling for the rear support of the forearm of an excavator. By setting components such as a bottom plate and a support plate, the device can quickly position the sleeves, side plates and connecting plates of the rear support workpiece. After positioning, preliminary welding fixation can be carried out, and finally complete welding can be carried out to make a finished product, thereby being able to improve the welding accuracy of the excavator structural parts to a certain extent;

[0004] 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. However, during the welding process of the main frame of the excavator boom, according to the welding position and angle, the angle of the main frame needs to be flipped. In the actual operation process, due to the large weight of the main frame, the operator usually uses a workshop crane and a steel cable to lift the main frame, and after flipping the angle, the main frame is placed on the welding tooling again. During this process, not only the operation process is cumbersome, but also the main frame has a risk of tipping and slipping during lifting due to unbalanced center of gravity, which has a certain safety hazard. At the same time, during the process of placing the main frame for the second time, 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

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a welding tooling for the middle part of the main frame of an excavator. By setting a lifting component, through the cooperation of the first hydraulic rod and the second hydraulic rod, the first hydraulic rod in the rising process will lift one end of the main frame upward, and at the same time, cooperate with another group of the first 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 carry out welding processing at different positions, thereby being able to effectively reduce the difficulty and risk of adjusting the position of the main frame, and further being able to help improve the flexibility of welding processing.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A welding tooling for the middle part of the main frame of an excavator, comprising a support base and a main frame. A sleeve is fixedly connected to the outer surface of the upper end of the support base. A bracket is rotatably connected to the outer surface of the sleeve. A second hydraulic rod is fixedly connected to the outer surface of the upper end of the support base. A lifting assembly for placing the main frame is arranged above the second hydraulic rod.

[0008] The lifting assembly includes a runner fixedly connected to the upper end of the second hydraulic rod. A clamping seat is rotatably connected to the outer surface of the runner. A fixed seat is fixedly connected to the inner surface of the upper part of the clamping seat. A first hydraulic rod is fixedly connected to the outer surface of the upper end of the bracket. A top block is fixedly connected to the upper end of the first hydraulic rod. A guiding groove is formed in the outer surface of the top block. A guiding block is slidably connected to the inner surface of the guiding groove. A supporting plate is fixedly connected to the outer surface of the upper end of the guiding block. The outer surface of the upper end of the supporting plate is in fit contact with the lower surface of the main frame.

[0009] Further, the clamping seat is of a U-shaped structure. The number of the first hydraulic rods is two groups and they are symmetrically distributed on the left and right sides of the second hydraulic rod. 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. The second hydraulic rod is located inside the sleeve.

[0010] Further, a rotating assembly for driving the main frame to rotate is arranged outside the sleeve. The rotating assembly includes a support sleeve fixedly connected to the outer surface of the upper end of the support base. The upper end of the support sleeve is rotatably connected to the outer surface of the lower end of the bracket. An installation sleeve is fixedly connected to the outer surface of the upper end of the bracket. The lower end of the installation sleeve penetrates to the lower side of the bracket. A movable rod is fixedly connected to the inner surface of the installation sleeve. A ball is rotatably connected to the outer surface of the movable rod. The number of the installation sleeve, the movable rod and the ball is two groups and they are symmetrically distributed. 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 base.

[0011] Further, positioning holes are formed in the outer surface of the upper end of the support base. The number of the positioning holes is several groups and they are evenly distributed. A positioning pin is slidably connected to the outer surface of the bracket. The lower end of the positioning pin penetrates through the positioning hole to the inner side of the support base. The positioning pin is of a T-shaped structure. The number of the positioning pins is two groups.

[0012] Further, a retaining disc is fixedly connected to the outer surface of the output rod of the second hydraulic rod. A clamping block is fixedly connected to the outer surface of the lower end of the retaining disc. A limiting block is fixedly connected to the inner surface of the sleeve. The number of the limiting blocks is several groups and they are distributed in a circular array. The clamping block is clamped between two adjacent limiting blocks.

[0013] Furthermore, a chute is penetratingly formed in the middle of the outer surface of the upper end of the fixed seat. A clamping plate is slidably connected inside the chute. The number of the clamping plates is two groups and they are symmetrically distributed. The lower end of the clamping plate penetrates to the lower side of the chute and is fixedly connected with a movable plate. The lower end outer surface of the movable plate is slidably connected with the inner surface of the lower end of the clamping seat. An electric push rod is fixedly connected between the two movable plates. A scale line is formed on the outer surface of the right end of the clamping seat.

[0014] Furthermore, a lifting assembly for lifting one end of the main frame is arranged outside the support plate. The lifting assembly includes a mounting groove formed on the outer surface of the support plate. A pin shaft is fixedly connected inside 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 near one side of the top block. The end of the tension spring away from the extrusion plate is fixedly connected with the outer surface of the lower end of the support plate.

[0015] Furthermore, a positioning assembly for calibrating the position of the main frame is arranged outside the extrusion plate. The positioning assembly includes a bladder fixedly connected to the outer surface of the extrusion plate. The outer surface of the bladder away from the extrusion plate is in close contact with the outer surface of the main frame. The bladder is made of an elastic high-temperature resistant material. The number of the extrusion plates and the bladders is two groups and they are symmetrically distributed on the left and right sides of the main frame.

[0016] Furthermore, a piston chamber is embedded inside the extrusion plate. A partition plate is fixedly connected to the middle of the inner surface of the piston chamber. A piston plate is slidably connected to the inner surface of the piston chamber. One end of the piston plate away from the partition plate is fixedly connected with a push rod. The end of the push rod away from the piston plate penetrates to the outside of the extrusion plate and is slidably connected with the extrusion plate. The end of the push rod away from the piston plate is fixedly connected with a contact plate. The outer surface of the contact plate away from the push rod is in close contact with the main frame. A conduit is fixedly connected to the outer surface of the bladder. The conduit is communicated with the inside of the piston chamber.

[0017] Furthermore, the number of the piston plates, the push rods and the contact plates is two groups and they are symmetrically distributed front and back. The contact plate is made of a high-temperature resistant material. An installation frame is fixedly connected to the side of the support plate away from the pin shaft. The upper end outer surface of the installation frame is in close contact with the lower end of the main frame.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] (1) In this solution, by setting the lifting component and cooperating the hydraulic rod one with the hydraulic rod two, the hydraulic rod one in the rising process will jack up one end of the main frame, and at the same time cooperate with the other group of hydraulic rod one to make the angle of the main frame flip, so as to flexibly adjust the angle of the main frame, so as to better carry out welding processing at different positions, thereby effectively reducing the difficulty and risk of adjusting the position of the main frame, and further contributing to improving the flexibility of welding processing;

[0020] (2) In this solution, by setting up a rotating component, when the bracket rotates, it will drive the ball to roll along the surface of the support seat. The rotation of the ball can not only make the rotation of the bracket more stable, but also the two symmetrically distributed balls can share part of the pressure received by the bracket, reducing the probability of the bracket deforming due to excessive force, so as to keep the position of the first hydraulic rod accurate and help improve the accuracy of the main frame position adjustment.

[0021] (3) In this solution, by setting up a positioning component, the push rod drives the contact plate to fit and contact with the inner surface of the main frame, which can play a limiting role on 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 fixture can be effectively improved, which can further improve the welding accuracy of the excavator main frame and help reduce the probability of the main frame shifting during the welding process. Brief Description of the Drawings

[0022] Figure 1 is the schematic diagram of the overall structure of the present invention Figure 1 ;

[0023] Figure 2 is the top view of the overall structure of the present invention;

[0024] Figure 3 is of the present invention Figure 2 Cross-sectional view taken along line A-A in

[0025] Figure 4 is of the present invention Figure 2 Cross-sectional view taken along line B-B in

[0026] Figure 5 is the schematic diagram of the overall structure of the present invention Figure 2 ;

[0027] Figure 6 is of the present invention Figure 3 Enlarged schematic view at C in

[0028] Figure 7 is of the present invention Figure 4 Enlarged schematic view at D in

[0029] Figure 8 is of the present invention Figure 5 Enlarged schematic view at E in

[0030] Explanation of the reference numerals in the drawings:

[0031] 11. Support base; 12. Positioning hole; 13. Support sleeve; 14. Bracket; 15. Positioning pin; 16. Mounting sleeve; 17. Movable rod; 18. Ball; 19. Hydraulic rod 1; 20. Sleeve; 21. Retaining disc; 22. Clamping seat; 23. Main frame; 24. Hydraulic rod 2; 25. Guide groove; 26. Clamping plate; 27. Rotating wheel; 28. Limit block; 29. Clamping 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 board; 39. Pin shaft; 40. Mounting groove; 41. Contact plate; 42. Push rod; 43. Piston plate; 44. Piston chamber; 45. Conduit; 46. Bladder; 47. Mounting frame; 48. Scale line; 49. Guide block. Detailed implementation manners

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1 to 8 , a welding tool for the middle part of the main frame of an excavator, including a support base 11 and a main frame 23. The upper outer surface of the support base 11 is fixedly connected with a sleeve 20. The outer surface of the sleeve 20 is rotatably connected with a bracket 14. The upper outer surface of the support base 11 is fixedly connected with a hydraulic rod 2 24. A lifting assembly for placing the main frame 23 is arranged above the hydraulic rod 2 24;

[0034] The lifting assembly includes a rotating wheel 27 fixedly connected to the upper end of the hydraulic rod 2 24. The outer surface of the rotating wheel 27 is rotatably connected with a clamping seat 22. The upper inner surface of the clamping seat 22 is fixedly connected with a fixed seat 33. The upper outer surface of the bracket 14 is fixedly connected with a hydraulic rod 1 19. The upper end of the hydraulic rod 1 19 is fixedly connected with a top block 34. A guide groove 25 is formed on the outer surface of the top block 34. A guide block 49 is slidably connected to the inner surface of the guide groove 25. The upper outer surface of the guide block 49 is fixedly connected with a support plate 36. The upper outer surface of the support plate 36 is in fit contact with the lower surface of the main frame 23.

[0035] The clamping seat 22 is in a U-shaped structure. The number of the hydraulic rods 1 19 is two groups and they are 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. The hydraulic rod 2 24 is located inside the sleeve 20.

[0036] By adopting the above technical solution, during the welding process of the main boom frame 23 of the excavator, it is necessary to adjust the position and angle of the main frame 23 according to the welding position and angle. In order to improve the welding efficiency and welding accuracy, a welding fixture is usually used for auxiliary welding. During operation, the support base 11 is placed on the ground to stably support the welding fixture. The support base 11 fixedly supports the second hydraulic rod 24. The second hydraulic rod 24 rotatably supports the clamping seat 22 through the runner 27, enabling the clamping seat 22 to rotate in the horizontal direction. Then, the main frame 23 is hoisted onto the surface of the fixing seat 33 inside the clamping seat 22. The fixing seat 33 lifts the main frame 23 in the middle of the main frame 23. The support base 11 rotatably supports the bracket 14 through the sleeve 20, enabling the bracket 14 to rotate with the sleeve 20 as the fulcrum. The bracket 14 lifts and supports the first hydraulic rod 19. A guide groove 25 is formed on the surface of the top block 34 fixedly connected to the upper end of the first hydraulic rod 19. The top block 34 is slidably connected to the guide block 49 through the guide groove 25. Thus, the top block 34 is movably connected to the support plate 36 through the guide block 49. When adjusting the placement angle of the main frame 23, one group of the first hydraulic rods 19 is extended upward while the other group of the first hydraulic rods 19 is contracted downward. At this time, the first hydraulic rod 19 in the rising process will lift one end of the main frame 23 upward, and at the same time, cooperate with the other group of the first hydraulic rods 19 to cause the main frame 23 to flip in angle, thereby flexibly adjusting the angle of the main frame 23 to better perform welding operations at different positions, effectively reducing the difficulty of adjusting the position of the main frame 23, and further contributing to improving the flexibility of welding processing.

[0037] As Figure 1 , Figure 4 and Figure 5 shown, a rotating assembly for driving the main frame 23 to rotate is provided on the outer side of the sleeve 20. The rotating assembly includes a support sleeve 13 fixedly connected to the outer surface of the upper end of the support base 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 outer surface of the upper end of the bracket 14 is fixedly connected with a mounting sleeve 16. The lower end of the mounting sleeve 16 penetrates to the lower side of the bracket 14. An active rod 17 is fixedly connected to the inner surface of the mounting sleeve 16. A ball 18 is rotatably connected to the outer surface of the active rod 17. The number of the mounting sleeve 16, the active rod 17 and the ball 18 is two groups and they are symmetrically distributed. 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 base 11.

[0038] A positioning hole 12 is formed on the outer surface of the upper end of the support base 11. The number of the positioning holes 12 is several groups and they are evenly distributed. A positioning pin 15 is slidably connected to the outer surface of the bracket 14. The lower end of the positioning pin 15 penetrates through the positioning hole 12 to the inner side of the support base 11. The positioning pin 15 has a T-shaped structure. The number of the positioning pins 15 is two groups.

[0039] A retaining disk 21 is fixedly connected to the outer surface of the output rod of the second hydraulic rod 24. A clamping block 29 is fixedly connected to the lower outer surface of the retaining disk 21. A limiting block 28 is fixedly connected to the inner surface of the sleeve 20. The number of the limiting blocks 28 is several groups and they are distributed in a circular array. The clamping block 29 is clamped between two adjacent limiting blocks 28.

[0040] 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 provided. During operation, the operator first lifts the first hydraulic rod 19 and the second hydraulic rod 24 synchronously upward. During the upward movement of the output end of the second hydraulic rod 24, the retaining disk 21 will be driven to move synchronously, so as to drive the clamping block 29 to move synchronously through the retaining disk 21, so that the clamping block 29 is separated from the limiting block 28 inside the sleeve 20. The sleeve 20 plays a role in supporting and limiting the annularly distributed limiting blocks 28. Then the operator takes out the positioning pin 15 from the positioning hole 12. Then the operator rotates the bracket 14 with the sleeve 20 as the fulcrum. The support sleeve 13 can support the bracket 14 in the vertical direction through the rotational connection with the bracket 14. The bracket 14 fixedly supports the movable rod 17 through the mounting sleeve 16, and rotatably supports the ball 18 through the movable rod 17. 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 symmetrically distributed balls 18 can share part of the pressure received by the bracket 14, reducing the probability of deformation of the bracket 14 due to excessive force, so as to keep the position of the first hydraulic rod 19 accurate. During the rotation of the bracket 14, the main frame 23 will be driven to move synchronously through the first hydraulic rod 19. At this time, the rotating wheel 27 is rotationally connected with the clamping seat 22, so that the clamping seat 22 can rotate with the rotating wheel 27 as the fulcrum, so as to drive the main frame 23 to rotate through the fixing seat 33 inside the clamping seat 22. After the main frame 23 rotates to an appropriate position, the first hydraulic rod 19 and the second hydraulic rod 24 are moved downward synchronously. The retaining disk 21 is driven to move downward synchronously through the second hydraulic rod 24. At this time, the clamping block 29 on the lower side of the retaining disk 21 will be clamped between the limiting blocks 28 again, so as to limit the position of the sleeve 20. Then the positioning pin 15 is inserted into the positioning hole 12 on the surface of the support seat 11 again from the upper side of the bracket 14. The bracket 14 is locked and fixed through the cooperation of the positioning hole 12 and the positioning pin 15, which 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 rotation operation of the main frame 23, and effectively reduce the risk of the main frame 23 during the hoisting and flipping process.

[0041] Such as Figure 1 And Figure 6As shown, a chute 32 is penetrated and opened in the middle of the outer surface of the upper end of the fixed seat 33. A clamping plate 26 is slidably connected inside the chute 32. The number of the clamping plates 26 is two groups and they are symmetrically distributed. The lower end of the clamping plate 26 penetrates to the lower side of the chute 32 and is fixedly connected with a movable plate 30. The outer surface of the lower end of the movable plate 30 is slidably connected with the inner surface of the lower end of the clamping seat 22. An electric push rod 31 is fixedly connected between the two movable plates 30. A scale line 48 is opened on the outer surface of the right end of the clamping seat 22.

[0042] 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 to operate. The two movable plates 30 are driven by the electric push rod 31 to move towards each other. At this time, the movable plates 30 will drive the clamping plates 26 to move synchronously. The chute 32 on the surface of the fixed seat 33 can play a role in sliding guidance for the clamping plates 26, so that the movement of the clamping plates 26 is more stable. The front and rear ends of the main frame 23 are clamped by the two clamping plates 26, so as to improve the stability of the main frame 23 during the welding and angle adjustment processes to a certain extent, help reduce the probability of accidental tipping of the main frame 23 during the movement process, and further help improve the reliability during the use of the welding tooling. By comparing and observing the position of the movable plate 30 with the scale line 48 on the surface of the clamping seat 22, the movement position of the movable plate 30 can be compared, and further the movement accuracy of the movable plate 30 can be effectively improved.

[0043] As Figure 7 shown, a lifting assembly for lifting one end of the main frame 23 is arranged outside the support plate 36. The lifting assembly includes a mounting groove 40 opened on the outer surface of the support plate 36. A pin shaft 39 is fixedly connected inside 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 near one side of the top block 34. One 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.

[0044] By adopting the above technical solution, during the process of the support plate 36 being in close 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 fixedly support the pin shaft 39. The extrusion plate 37 is rotatably supported by the pin shaft 39. Under the elastic force of the tension spring 35, the extrusion plate 37 will be located at the side of the main frame 23. The support plate 36 pulls and supports the tension spring 35. The left and right ends of the main frame 23 can be supported by the two extrusion plates 37, so as to further improve 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, so as to reduce the deformation amount of the steel plate during the welding process of the main frame 23 and help improve the welding processing accuracy of the main frame 23.

[0045] As Figure 5, Figure 7 As shown in Figure 8 , a positioning component for calibrating the position of the main frame 23 is arranged outside the extrusion plate 37. The positioning component includes a bladder 46 fixedly connected to the outer surface of the extrusion plate 37. The outer surface of the bladder 46 on the side away from the extrusion plate 37 is in close contact with the outer surface of the main frame 23. The bladder 46 is made of an elastic high-temperature resistant material. The number of the extrusion plates 37 and the bladders 46 is two groups and they are symmetrically distributed on the left and right sides of the main frame 23.

[0046] A piston chamber 44 is embedded and opened on 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 chamber 44. A piston plate 43 is slidably connected to the inner surface of the piston chamber 44. One end of the piston plate 43 away from the partition plate 38 is fixedly connected to a push rod 42. One 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. One end of the push rod 42 away from the piston plate 43 is fixedly connected to a contact plate 41. The outer surface of the contact plate 41 on the side away from the push rod 42 is in close contact with the outer surface of the main frame 23. A conduit 45 is fixedly connected to the outer surface of the bladder 46. The conduit 45 is communicated with the inside of the piston chamber 44.

[0047] The number of the piston plates 43, the push rods 42 and the contact plates 41 is two groups and they are symmetrically distributed front and back. The contact plate 41 is made of a high-temperature resistant material. An installation frame 47 is fixedly connected to the side of the support plate 36 away from the pin shaft 39. The upper outer surface of the installation frame 47 is in close contact with the lower end of the main frame 23.

[0048] By adopting the above technical solution, when the extrusion plate 37 drives the bladder 46 to be in close contact with the outer surface of the main frame 23, the extrusion plate 37 and the main frame 23 cooperate to squeeze the bladder 46. The partition plate 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 inside of the piston chamber 44 through the conduit 45. The gas is used to push the piston plate 43 inside the piston chamber 44, so as to drive the push rod 42 to move away from the partition plate 38 through the piston plate 43, so that the push rod 42 drives the contact plate 41 to be in close contact with the inner surface of the main frame 23, so as to play a limiting role on 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, so as to further improve the welding precision of the main frame 23 of the excavator and help to reduce the probability of the main frame 23 deviating during the welding process.

[0049] Usage method: During operation, hoist the main frame 23 and install it on the surface of the fixed seat 33 inside the clamping seat 22. Support the main frame 23 in the middle through the fixed seat 33, and clamp the front and rear ends of the main frame 23 with 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 installation groove 40 opened on the surface of the support plate 36 is used to fixedly support the pin shaft 39. The extrusion plate 37 is rotatably supported by the pin shaft 39. Under the elastic force of the tension spring 35, the extrusion plate 37 will be located on the side of the main frame 23. When the extrusion plate 37 drives the bladder 46 to be in contact with the outer surface of the main frame 23, the piston plate 43 drives the push rod 42 to move away from the partition plate 38, so that the push rod 42 drives the contact plate 41 to be in contact with the inner surface of the main frame 23, thereby being able to limit the main frame 23. During the rotation of the bracket 14, the main frame 23 will be driven to move synchronously through the first hydraulic rod 19. During the rotation of the bracket 14, the ball 18 will 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. By extending one set of the first hydraulic rods 19 upward and retracting the other set of the first hydraulic rods 19 downward, the first hydraulic rod 19 in the rising process will jack up one end of the main frame 23, and at the same time cooperate with the other set of the first hydraulic rods 19 to flip the angle of the main frame 23, so as to flexibly adjust the angle of the main frame 23.

[0050] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and 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), 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); 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 end outer surface of the top block (34) is in the shape of an arc, the upper end outer surface of the fixing seat (33) is in the shape of an arc, and the hydraulic rod (24) is located inside the sleeve (20); 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).

2. The middle welding tool for the main frame of an excavator according to claim 1, 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).

3. The middle welding tool for the main frame of an excavator according to claim 2, characterized in that: 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.

4. The middle welding tool for the main frame of an excavator according to claim 1, 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).

5. The middle welding tool for the main frame of an excavator according to claim 4, 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).

6. The middle welding tool for the main frame of an excavator according to claim 5, 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).

7. The middle welding tool for the main frame of an excavator according to claim 6, 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).

8. The middle welding tool for the main frame of an excavator according to claim 7, 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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