A welding tool for excavator bucket

Abstract

The application discloses a kind of excavator bucket welding tool, belong to bucket auxiliary manufacturing equipment field, including base, bottom plate clamping mechanism, side plate positioning mechanism and multiple bottom plate setting mechanism;Side plate positioning mechanism includes support assembly symmetrically arranged on base, the upper end of support assembly is equipped with permanent magnet jack;Bottom plate setting mechanism includes basket cylinder and pull rod screw-connected at both ends of basket cylinder, the end of pull rod is hinged with U-shaped buckling plate, and adjusting bolt is screw-connected on U-shaped buckling plate.The application is cooperated by adjustable bottom plate clamping mechanism, self-adapting centering side plate positioning mechanism and detachable mechanical bottom plate setting mechanism, discards traditional bottom plate inversion clamping, hoisting and turning over after welding operation mode, without spot welding fixing, cutting and removing, saves workpiece inner wall welding scar polishing process, avoids scratching and wearing of bucket base material by polishing, improves the production efficiency of shovel, adapts to multi-specification bucket processing, and has strong versatility.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary manufacturing equipment for excavator buckets, and specifically relates to a welding fixture for excavator buckets. Background Technology

[0002] As a key working component at the front end of an excavator, the excavator bucket is formed by welding together components such as an arc-shaped bottom plate, two side plates, bucket tooth seat, and main shaft lugs. During the welding process, heat input causes uneven expansion and contraction of the plates, which can easily lead to welding deformation. This directly affects the overall dimensional accuracy, structural rigidity, and load-bearing capacity of the bucket, making it a key technical challenge in bucket manufacturing.

[0003] Currently, the mainstream bucket welding process in the industry mostly adopts the inverted clamping process: the arc-shaped bottom plate is placed upside down on the basic tooling fixture, and then the two side plates are attached to the sides of the bottom plate to complete the positioning welding. In this clamping method, the open end of the arc-shaped bottom plate faces downward against the tooling table. Under the continuous action of the plate's own weight, the plates on both sides of the bottom plate opening expand outward. After welding, the bucket opening size is seriously out of tolerance, the forming consistency is poor, which greatly increases the workload of subsequent correction and repair, and reduces the finished product qualification rate.

[0004] To address the issue of easy expansion and deformation during inverted welding of curved bottom plates, patent document CN121156642B discloses an auxiliary welding device for bucket processing. This device arranges multiple sets of inner support plates matching the contour of the bucket shell's inner wall along the length of the connecting seat. After the main body of the bucket shell is welded, a drive cylinder lifts the connecting seat, causing the outer wall of the inner support plate to abut tightly against the inner wall of the shell. Then, clamping components secure the shell to pre-position the inner support plate. Subsequently, a crane lifts the entire workpiece, flips it over, and places it on the ground. Multi-point welding is used to fix the inner support plate to the inner wall of the shell, relying on the multi-point support of the inner support plate to constrain the shell, thereby reducing shell deformation after welding. While this solution can alleviate the welding deformation problem of the bucket shell to some extent, several unavoidable defects still exist in actual production applications. First, after the inner support plate and the outer shell are pre-clamped and positioned, the entire workpiece must be lifted off the fixture and turned over to the ground by hoisting equipment. The hoisting and transportation takes up a lot of time, and there is a risk of workpiece collision and positioning displacement during the hoisting process, which is not conducive to continuous welding operations on the assembly line. The process is cumbersome and the production efficiency is low.

[0005] Secondly, the inner support plate is fixed to the bucket shell by spot welding. After the workpiece has completely cooled and solidified, the weld points between the inner support plate and the shell must be removed using cutting equipment before the inner support plate can be disassembled. Subsequent grinding of residual weld scars inside the shell is also required, resulting in numerous processing steps. On the one hand, the inner support plate needs to be ground to remove weld scars after each use. Repeated grinding causes continuous loss of the inner support plate's outline dimensions, gradually reducing the support fitting accuracy and rendering the support effect ineffective. Furthermore, the inner support plate outline of this equipment is matched to a single specification of bucket shell, making it unsuitable for buckets of different capacities and sizes, resulting in poor tooling versatility and high equipment investment costs. On the other hand, grinding weld scars on the inner wall of the bucket shell is labor-intensive, and the grinding process easily scratches and abrades the steel base material, damaging the surface integrity of the plate and reducing the bucket's wear resistance and service life. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a welding fixture for excavator buckets, so as to solve the problems of existing bucket welding fixtures requiring hoisting and flipping, complicated procedures, low production efficiency, poor versatility, and easy wear and tear of the fixtures and workpieces.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A welding fixture for an excavator bucket includes a base, a base plate clamping mechanism disposed at the front end of the base, side plate positioning mechanisms disposed on both sides of the base, and multiple base plate shaping mechanisms for shaping the opening of the base plate. The base plate clamping mechanism includes multiple U-shaped seats arranged along the width direction of the base, with a clamping cylinder mounted on the upper part of each U-shaped seat, and a first clamping plate connected to the piston rod end of the clamping cylinder. The side plate positioning mechanisms include support components symmetrically arranged on the base, with the support components intermittently installed in guide grooves on the upper part of the base, and a permanent magnet lifting device at the upper end of each support component. The device includes a side plate slide at the lower end of the support assembly, a side plate guide rail inside the base that slides with the side plate slide, a motor mounted on the side wall of the base, a first double-ended stud connected to the output shaft of the motor, and the first double-ended stud threadedly connected to the support assembly; the base plate shaping mechanism includes a basket tube and pull rods threadedly connected to both ends of the basket tube, a U-shaped buckle plate hinged to the end of the pull rod, the U-shaped buckles on both sides respectively snapping into the two ends of the opening of the base plate, an adjusting bolt threadedly connected to the U-shaped buckle plate, and a second clamping plate rotatably connected to the end of the adjusting bolt.

[0008] Furthermore, the support assembly includes a column, the first double-ended stud is threadedly connected to the column, a telescopic column is slidably connected to the upper part of the column, a lifting cylinder is fixedly connected inside the column, and the piston rod of the lifting cylinder is fixedly connected to the lower end of the telescopic column for adjusting the overall height of the support assembly.

[0009] Furthermore, the upper end of the column is provided with a flipping mechanism, which includes a housing fixedly installed on the upper end of the telescopic column. A first rotating shaft is rotatably connected inside the housing. A worm gear is fixedly connected to the first rotating shaft. A connecting plate is fixedly connected to one end of the first rotating shaft. The connecting plate is connected to a permanent magnet lifter. A worm gear meshing with the worm gear is rotatably connected inside the housing. A handwheel is provided at one end of the worm gear.

[0010] Furthermore, a U-shaped guide rail is provided on one side of the base, and a U-shaped slider is provided on one side of the U-shaped seat. The U-shaped slider is slidably mounted on the U-shaped guide rail, and a second double-ended stud is threadedly connected to the lower part of the U-shaped seat for adjusting the position of the base plate clamping mechanism.

[0011] Furthermore, the base is symmetrically provided with an ear plate positioning mechanism on one side. The ear plate positioning mechanism includes an ear plate seat, on which a first support arm is hinged. The first support arm is connected to the ear plate seat via a first hydraulic cylinder. A second support arm is hinged to the upper end of the first support arm, and the first support arm and the second support arm are connected via a second hydraulic cylinder. A fixed seat is fixedly connected to one end of the second support arm. A support rod is provided on one side of the fixed seat, and a movable seat is provided on the support rod. A screw is fixedly connected to one side of both the fixed seat and the movable seat. The screw is placed in the main shaft hole of the ear plate, and a pressing block is threaded onto the screw for fixing the ear plate to the ear plate positioning mechanism.

[0012] Furthermore, the support rod is threaded, one end of the support rod is rotatably connected to the fixed seat, and the movable seat is threadedly connected to the support rod for adjusting the position of the movable seat.

[0013] Furthermore, the fixed seat and the movable seat have a tapered structure on the side near the ear plate, and the end of the extrusion block near the ear plate also has a tapered structure.

[0014] Furthermore, the front end of the base plate is provided with several bucket tooth clamps, each bucket tooth clamp including a bucket tooth slide. The base is provided with a longitudinal guide rail, and the bucket tooth slide is slidably mounted on the longitudinal guide rail. The bucket tooth slide is provided with several support plates, and clamping plates are provided on both sides of the support plates. The bucket teeth are placed on the support plates and clamped between the clamping plates. A pushing cylinder is provided on one side of the base. The piston rod of the pushing cylinder is connected to the bucket tooth slide and is used to push the bucket tooth clamp closer to or away from the base plate.

[0015] Furthermore, the lower sides of the support plate are slidably connected to clamping slides, and the clamping plate is fixedly installed on the upper part of the clamping slides. A second rotating shaft is rotatably connected to the support plate, and a gear and a rotating plate are fixedly installed on the second rotating shaft. The two ends of the rotating plate are connected to the clamping slides through connecting rods. A rack is slidably connected to the lower part of the support plate, and the rack meshes with the gear. One end of the rack is provided with a sleeve. The lower part of the support plate is installed on the bucket tooth slide through support feet. A clamping cylinder is provided on one side of the clamping slide, and the piston rod of the clamping cylinder is connected to the sleeve.

[0016] Furthermore, the bucket tooth slide is provided with an adjustment mechanism for synchronously and equidistantly adjusting the spacing of multiple bucket tooth clamps. The adjustment mechanism includes a scissor telescopic frame, with a second rotating shaft hinged to the middle of the scissor telescopic frame. The bucket tooth slide is provided with a transverse guide rail. The support leg of the bucket tooth clamp located in the middle is fixedly connected to the bucket tooth slide, and the support legs of the bucket tooth clamps located on both sides of the middle are slidably engaged with the transverse guide rail. One end of the scissor telescopic frame is provided with a drive rod, and one side of the bucket tooth slide is provided with an adjustment cylinder. The piston rod of the adjustment cylinder is connected to the drive rod. The sleeves of adjacent bucket tooth clamps are connected by a linkage rod, and the linkage rod is slidably engaged with the sleeve.

[0017] The beneficial effects of this invention are: (1) The present invention has an overall structure that combines an adjustable base plate clamping mechanism, an adaptive centering side plate positioning mechanism and a detachable mechanical base plate shaping mechanism. This eliminates the traditional operation method of inverted clamping of the base plate and lifting and flipping after welding. The entire process does not require lifting equipment to transfer the workpiece, saving the tedious process of lifting, flipping and secondary positioning, and avoiding the problems of workpiece collision and positioning deviation during the lifting process. There is no need for spot welding and cutting and dismantling, saving the process of grinding the weld scars on the inner wall of the workpiece, avoiding scratches and wear on the bucket base material during grinding, improving the production efficiency of the bucket, adapting to the processing of multiple specifications of buckets, and having strong versatility.

[0018] (2) The support assembly adopts a telescopic structure, which, together with the flipping mechanism at the upper end of the support assembly, enables the adjustment of the height and angle of the side plate, ensuring the accuracy of the side plate positioning welding.

[0019] (3) By setting up a lug positioning mechanism, when welding the lug, the lug to be welded is clamped onto the lug positioning mechanism, so that the screws on the fixed seat and the movable seat are respectively inserted into the main shaft hole of the lug. By turning the extrusion block on the screw, the axial pressing action of the extrusion block is used to lock and fix the lug, thus completing the pre-clamping and positioning of the lug and avoiding deformation of the lug during the welding process. According to the overall assembly angle of the bucket and the welding process requirements, the extension and retraction actions of the first hydraulic cylinder and the second hydraulic cylinder are controlled respectively to adjust the angle of the lug so that the lug matches the main body of the bucket.

[0020] (4) By setting up multiple sets of linked bucket tooth clamps, the positioning of the bucket teeth is realized. By using the adjustment mechanism at the bottom of the bucket tooth clamp, the scissor telescopic frame is used to realize the synchronous and equidistant adjustment of multiple bucket tooth clamps, which can be adapted to the positioning and installation of bucket teeth of different specifications of buckets. Attached Figure Description

[0021] Figure 1 This is a diagram showing the usage status of a welding fixture for an excavator bucket according to the present invention.

[0022] Figure 2 This is a schematic diagram of a welding fixture structure for an excavator bucket according to the present invention.

[0023] Figure 3 This is a schematic diagram of the base.

[0024] Figure 4 This is a schematic diagram of the base plate clamping mechanism.

[0025] Figure 5 This is a schematic diagram of the interior of the base.

[0026] Figure 6 This is a schematic diagram of the side panel positioning mechanism.

[0027] Figure 7 This is a schematic diagram of the base plate shaping mechanism.

[0028] Figure 8 This is a schematic diagram of the bucket tooth clamp assembly.

[0029] Figure 9 This is a schematic diagram of the adjustment mechanism.

[0030] Figure 10 This is a schematic diagram of the bottom of the bucket tooth clamp.

[0031] Figure 11 This is a schematic diagram of the ear plate positioning mechanism.

[0032] In the picture: 1. Base; 11. Guide groove; 2. Base plate clamping mechanism; 21. U-shaped seat; 22. Clamping cylinder; 23. First clamping plate; 24. U-shaped seat slider; 25. Second double-ended stud; 26. U-shaped seat guide rail; 3. Side plate positioning mechanism; 31. Column; 32. Lifting cylinder; 33. Telescopic column; 34. Permanent magnet lifter; 35. Side plate slide; 36. Side plate guide rail; 37. First double-ended stud; 38. Motor; 4. Tilting mechanism; 41. Housing; 42. Worm gear; 43. Worm wheel; 44. First rotating shaft; 45. Connecting plate; 5. Base plate shaping mechanism; 51. Basket tube; 52. Tie rod; 53. U-shaped buckle plate; 54. Adjusting bolt; 55. Second clamping plate; 6. Ear plate positioning mechanism; 61. Ear plate seat; 62. First support arm; 63. First hydraulic cylinder; 64. Second support arm; 65. Second hydraulic cylinder; 66. Fixed seat; 67. Movable seat; 68. Support rod; 69. Screw; 610. Extrusion block; 7. Bucket tooth clamp; 71. Support plate; 72. Clamping plate; 73. Second rotating shaft; 74. Rotating plate; 75. Connecting rod; 76. Clamping plate slide; 77. Gear; 78. Rack; 79. Support leg; 710. Sleeve; 711. Linkage rod; 712. Transverse guide rail; 713. Bucket tooth slide; 714. Clamping cylinder; 715. Scissor lift telescopic frame; 716. Drive rod; 717. Adjusting cylinder; 718. Longitudinal guide rail; 719. Pushing cylinder. Detailed Implementation

[0033] The following will be combined with the appendix Figures 1-11 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] like Figure 1 , Figure 2 As shown, a welding fixture for excavator buckets includes a base 1, a base plate clamping mechanism 2 disposed at the front end of the base 1, a side plate positioning mechanism 3 disposed on both sides of the base 1, and a plurality of base plate shaping mechanisms 5 for shaping the opening of the base plate. like Figures 3-5 As shown, the base plate clamping mechanism 2 includes a plurality of U-shaped seats 21 arranged along the width direction of the base 1. The opening of the U-shaped seat 21 faces the base plate. A clamping cylinder 22 is installed on the upper part of the U-shaped seat 21. The piston rod end of the clamping cylinder 22 is connected to a first clamping plate 23. When clamping the base plate, the base plate is placed on the base 1 and the front end of the base plate extends into the U-shaped seat 21. After the clamping cylinder 22 extends, the front end of the base plate is fixed to the base 1 by the first clamping plate 23, thereby realizing the locking and fixing between the base plate and the base. like Figure 1-3 , Figure 6As shown, the side plate positioning mechanism 3 includes support components symmetrically arranged on the base 1. The support components are intermittently installed in the guide groove 11 on the upper part of the base 1. The upper end of the support component is provided with a permanent magnet lifter 34 for adsorbing and fixing the side plate. The lower end of the support component is provided with a side plate slide 35. The base 1 is provided with a side plate guide rail 36 that slides with the side plate slide 35. A motor 38 is installed on the side wall of the base 1. A first double-ended stud 37 is connected to the output shaft of the motor 38. The first double-ended stud 37 is threadedly connected to the support component. After the base plate is placed on the base 1, the motor 38 drives the first double-ended stud 37 to rotate in the forward direction, driving the two side support components along the side plate guide rail 36. 6. The bottom plate is centered and positioned in the middle of the tooling by sliding synchronously towards each other; then the clamping cylinder 22 is activated, and the first clamping plate 23 is pressed down through the piston rod to firmly clamp and fix the front end of the bottom plate to the base 1, thus completing the positioning and locking of the bottom plate; after the bottom plate is fixed, the control motor 38 is reversed to drive the two side support components to slide back to back and open moderately, so that the two bucket side plates are respectively attached to one side of the permanent magnet lifter 34 of the two side support components, and the side plates are fixed by the magnetic force of the permanent magnet lifter 34; the motor 38 is activated again in the forward direction to drive the two side support components and side plates to move towards each other synchronously, so that the side plates are attached to the two sides of the bottom plate, thus completing the assembly and positioning of the whole bucket blank; like Figure 1 , Figure 7 As shown, the base plate shaping mechanism 5 includes a basket tube 51 and pull rods 52 threaded to both ends of the basket tube 51. A U-shaped buckle plate 53 is hinged to the end of each pull rod 52. The U-shaped buckles 53 on both sides are respectively snapped into the two ends of the base plate opening. Adjusting bolts 54 are threaded onto the U-shaped buckles 53, and a second clamping plate 55 is rotatably connected to the end of each adjusting bolt 54. After the base plate shaping mechanism 5 is snapped into the two ends of the base plate opening, the basket tube 51 is rotated according to the specifications of the bucket to be processed, adjusting the extension length of the pull rods 52 at both ends to calibrate the overall size of the base plate opening. After welding, only the adjusting bolts 54 need to be turned in the opposite direction to release the clamping limit of the second clamping plate 55, thus removing the base plate shaping mechanism 5 and completing a single welding operation. The base plate shaping mechanism 5 in this solution is not only suitable for buckets of different specifications, but also highly versatile and reusable.

[0036] like Figure 6 As shown, the support assembly includes a column 31, a first double-headed stud 37 threadedly connected to the column 31, a telescopic column 33 slidably connected to the upper part of the column 31, and a lifting cylinder 32 fixedly connected inside the column 31. The piston rod of the lifting cylinder 32 is fixedly connected to the lower end of the telescopic column 33 to adjust the overall height of the support assembly to adapt to the hoisting operation of plates of different specifications. At the same time, the height of the side plates can be adjusted to ensure the welding accuracy of the side plates.

[0037] like Figure 6As shown, the upper end of the column 31 is provided with a flipping mechanism 4. The flipping mechanism 4 includes a housing 41 fixedly installed on the upper end of the telescopic column 33. A first rotating shaft 44 is rotatably connected inside the housing 41. A worm gear 43 is fixedly connected to the first rotating shaft 44. A connecting plate 45 is fixedly connected to one end of the first rotating shaft 44. The connecting plate 45 is connected to the permanent magnet lifter 34. A worm 42 that meshes with the worm gear 43 is rotatably connected inside the housing 41. A handwheel is provided at one end of the worm 42. Rotating the handwheel drives the first rotating shaft 44 to rotate through the transmission of the worm gear 43 and worm 42, thereby driving the side plate to rotate through the permanent magnet lifter 34, realizing the adjustment of the side plate angle.

[0038] like Figure 3 , Figure 5 As shown, a U-shaped seat guide rail 26 is provided on one side of the base 1, and a U-shaped seat slider 24 is provided on one side of the U-shaped seat 21. The U-shaped seat slider 24 is slidably installed on the U-shaped seat guide rail 26. A second double-headed stud 25 is threadedly connected to the lower part of the U-shaped seat 21, which is used to adjust the position of the base plate clamping mechanism 2, thereby adjusting the fixed position of the base plate to adapt to the fixing of base plates of different specifications.

[0039] like Figures 1-2 , Figure 11 As shown, the base 1 is symmetrically provided with an ear plate positioning mechanism 6 on one side. The ear plate positioning mechanism 6 includes an ear plate seat 61, on which a first support arm 62 is hinged. The first support arm 62 and the ear plate seat 61 are connected by a first hydraulic cylinder 63. A second support arm 64 is hinged to the upper end of the first support arm 62. The first support arm 62 and the second support arm 64 are connected by a second hydraulic cylinder 65. A fixed seat 66 is fixedly connected to one end of the second support arm 64. A support rod 68 is provided on one side of the fixed seat 66. A movable seat 67 is provided on the support rod 68. A screw 69 is fixedly connected to one side of both the fixed seat 66 and the movable seat 67. The screw 69 is placed on the main shaft of the ear plate. Inside the hole, a pressing block 610 is threaded onto the screw 69 to fix the ear plate onto the ear plate positioning mechanism 6. When welding the ear plate, the ear plate to be welded is clamped onto the ear plate positioning mechanism 6, so that the screws 69 on the fixed seat 66 and the movable seat 67 respectively pass into the main shaft hole of the ear plate. By turning the pressing block 610 on the screw 69, the axial pressing action of the pressing block 610 is used to lock and fix the ear plate, completing the pre-clamping and positioning of the ear plate, and avoiding deformation of the ear plate during the welding process. According to the overall assembly angle of the bucket and the welding process requirements, the extension and retraction actions of the first hydraulic cylinder 63 and the second hydraulic cylinder 65 are controlled respectively to adjust the angle of the ear plate so that the ear plate matches the main body of the bucket.

[0040] like Figure 11As shown, the support rod 68 is threaded, one end of the support rod 68 is rotatably connected to the fixed seat 66, and the movable seat 67 is threadedly connected to the support rod 68, which is used to adjust the position of the movable seat 67 to adapt to the clamping and positioning requirements of ear plates of different specifications and sizes.

[0041] like Figure 11 As shown, the fixed seat 66 and the movable seat 67 have a tapered structure on the side near the ear plate, and the end of the extrusion block near the ear plate is also tapered. The tapered end face can adapt to the diameter of the spindle hole, thereby enhancing the applicability of the ear plate positioning mechanism 6 and ensuring the stability of the ear plate clamping.

[0042] like Figures 1-2 , Figure 8 As shown, the front end of the base plate is provided with several bucket tooth clamps 7, each bucket tooth clamp 7 including a bucket tooth slide 713. The base 1 is provided with a longitudinal guide rail 718, and the bucket tooth slide 713 is slidably mounted on the longitudinal guide rail 718. The bucket tooth slide 713 is provided with several support plates 71, and clamping plates 72 are provided on both sides of the support plates 71. The bucket teeth are placed on the support plates 71 and clamped between the clamping plates 72. A pushing cylinder 719 is provided on one side of the base 1. The piston rod of the pushing cylinder 719 is connected to the bucket tooth slide 713 and is used to push the bucket tooth clamp 7 closer to or away from the base plate.

[0043] After the side plates and bottom plates are welded, the bucket teeth to be welded are placed on the support plate 71 of the bucket tooth slide 713. The bucket teeth are clamped and limited by the clamping plates 72 on both sides. Then, the bucket tooth slide 713 is driven to slide along the longitudinal guide rail 718 by the extension and retraction of the push cylinder 719, which drives the bucket teeth to approach the front end of the bucket bottom plate, so as to realize the alignment and fit between the bucket teeth and the bottom plate. After the position is calibrated, the bucket tooth welding operation can be carried out. After the welding is completed, the clamping plate 72 releases the bucket teeth, and the push cylinder 719 drives the fixture to reset and exit.

[0044] like Figure 10 As shown, the lower sides of the support plate 71 are slidably connected to clamping slides 76, and the clamping plate 72 is fixedly installed on the upper part of the clamping slides 76. A second rotating shaft 73 is rotatably connected to the support plate 71, and a gear 77 and a rotating plate 74 are fixedly installed on the second rotating shaft 73. The two ends of the rotating plate 74 are connected to the clamping slides 76 through connecting rods 75. A rack 78 is slidably connected to the lower part of the support plate 71, and the rack 78 meshes with the gear 77. One end of the rack 78 is provided with a sleeve 710. The lower part of the support plate 71 is installed on the bucket tooth slide 713 through support feet 79. Figure 8As shown, a clamping cylinder 714 is provided on one side of the clamping plate slide 76. The piston rod of the clamping cylinder 714 is connected to the sleeve 710. When the clamping cylinder 714 extends or retracts, it drives the sleeve 710 to slide longitudinally. The sleeve 710 drives the gear 77 and the second rotating shaft 73 to rotate through the rack 78. The second rotating shaft 73 drives the clamping plate slides 76 on both sides to move closer or further apart through the rotating plate 74 and the connecting rod 75, thereby realizing the clamping and releasing of the bucket teeth.

[0045] The bucket tooth slide 713 is equipped with an adjustment mechanism for synchronously and equidistantly adjusting the spacing of multiple bucket tooth clamps 7, such as... Figure 9 As shown, the adjusting mechanism includes a scissor lift frame 715, a second rotating shaft 73 hinged to the middle of the scissor lift frame 715, a transverse guide rail 712 on the bucket tooth slide 713, a support leg 79 of the bucket tooth clamp 7 located in the middle fixedly connected to the bucket tooth slide 713, and support legs 79 of the bucket tooth clamps 7 located on both sides of the middle slidingly engaged with the transverse guide rail 712; one end of the scissor lift frame 715 is provided with a drive rod 716, such as... Figure 8 As shown, an adjusting cylinder 717 is provided on one side of the bucket tooth slide block 713. The piston rod of the adjusting cylinder 717 is connected to the drive rod 716. The sleeves 710 of the adjacent bucket tooth clamps 7 are connected by a linkage rod 711, and the linkage rod 711 and the sleeve 710 slide together to adapt to the adjustment of the spacing of the bucket tooth clamps 7.

[0046] In this design, a scissor-type synchronous spacing adjustment mechanism is added to the multiple sets of bucket tooth clamps 7. During the overall adjustment process, the central bucket tooth clamp 7 remains fixed as a positioning reference. When it is necessary to adjust the spacing of the bucket tooth clamps 7, the adjusting cylinder 717 is activated. The piston rod of the adjusting cylinder 717 extends and retracts, driving the drive rod 716 to move. The drive rod 716 pushes and pulls the scissor telescopic frame 715 to complete the extension or retraction action. Relying on the symmetrical extension and retraction characteristics of the scissor telescopic frame 715, and in conjunction with the sliding engagement of the two bucket tooth clamps 7's support legs 79 and the transverse guide rail 712, the two bucket tooth clamps 7 on both sides move synchronously and symmetrically closer or further away from the central clamp, achieving equidistant synchronous adjustment of multiple sets of bucket tooth clamps 7, adapting to the positioning and installation of bucket teeth of different specifications of buckets. The linkage rod 711 slides with the sleeve 710, which can adaptively adapt to the spacing changes, ensuring that the clamping action of the clamping plate 72 is not affected after the spacing of multiple sets of bucket tooth clamps 7 is adjusted.

[0047] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A welding fixture for an excavator bucket, comprising a base, a base plate clamping mechanism disposed at the front end of the base, side plate positioning mechanisms disposed on both sides of the base, and a plurality of base plate shaping mechanisms for shaping the opening of the base plate; characterized in that, The base plate clamping mechanism includes multiple U-shaped seats arranged along the width of the base. A clamping cylinder is installed on the upper part of the U-shaped seat, and the piston rod end of the clamping cylinder is connected to a first clamping plate. The side plate positioning mechanism includes support components symmetrically arranged on the base. The support components are intermittently installed in the guide grooves on the upper part of the base. A permanent magnet lifter is provided at the upper end of the support component. A side plate slide is provided at the lower end of the support component. A side plate guide rail is provided inside the base to slide with the side plate slide. A motor is installed on the side wall of the base. A first double-ended stud is connected to the output shaft of the motor. The first double-ended stud is threadedly connected to the support component. The base plate shaping mechanism includes a basket tube and pull rods threaded to both ends of the basket tube. A U-shaped buckle is hinged to the end of the pull rod. The U-shaped buckles on both sides are respectively snapped onto the base. At both ends of the plate opening, the U-shaped buckle is threaded with adjusting bolts, and the ends of the adjusting bolts are rotatably connected to second clamping plates; the support assembly includes a column, the first double-ended stud is threadedly connected to the column, the upper part of the column is slidably connected to a telescopic column, a lifting cylinder is fixedly connected inside the column, the piston rod of the lifting cylinder is fixedly connected to the lower end of the telescopic column, used to adjust the overall height of the support assembly; the upper end of the column is provided with a flipping mechanism, the flipping mechanism includes a housing fixedly installed on the upper end of the telescopic column, a first rotating shaft is rotatably connected inside the housing, a worm gear is fixedly connected to the first rotating shaft, a connecting plate is fixedly connected to one end of the first rotating shaft, and the connecting plate is connected to a permanent magnet lifter; a worm gear meshing with the worm gear is rotatably connected inside the housing, and a handwheel is provided at one end of the worm gear.

2. The excavator bucket welding fixture according to claim 1, characterized in that, The base is provided with a U-shaped guide rail on one side and a U-shaped slider on the other side. The U-shaped slider is slidably mounted on the U-shaped guide rail. A second double-ended stud is threadedly connected to the lower part of the U-shaped seat for adjusting the position of the base plate clamping mechanism.

3. The excavator bucket welding fixture according to claim 1, characterized in that, The base is symmetrically provided with an ear plate positioning mechanism on one side. The ear plate positioning mechanism includes an ear plate seat, on which a first support arm is hinged. The first support arm is connected to the ear plate seat via a first hydraulic cylinder. A second support arm is hinged to the upper end of the first support arm, and the first and second arms are connected via a second hydraulic cylinder. A fixed seat is fixedly connected to one end of the second support arm. A support rod is provided on one side of the fixed seat, and a movable seat is provided on the support rod. A screw is fixedly connected to one side of both the fixed seat and the movable seat. The screw is placed in the main shaft hole of the ear plate, and a pressing block is threaded onto the screw for fixing the ear plate to the ear plate positioning mechanism.

4. The excavator bucket welding fixture according to claim 3, characterized in that, The support rod is threaded, one end of which is rotatably connected to the fixed seat, and the movable seat is threadedly connected to the support rod for adjusting the position of the movable seat.

5. The excavator bucket welding fixture according to claim 3, characterized in that, The fixed seat and the movable seat have a conical structure on the side near the ear plate, and the end of the extrusion block near the ear plate also has a conical structure.

6. A welding fixture for an excavator bucket according to any one of claims 1-5, characterized in that, The front end of the base plate is provided with several bucket tooth clamps, each bucket tooth clamp including a bucket tooth slide. The base is provided with a longitudinal guide rail, and the bucket tooth slide is slidably mounted on the longitudinal guide rail. The bucket tooth slide is provided with several support plates, and clamping plates are provided on both sides of the support plates. The bucket teeth are placed on the support plates and clamped between the clamping plates. A pushing cylinder is provided on one side of the base. The piston rod of the pushing cylinder is connected to the bucket tooth slide and is used to push the bucket tooth clamps closer to or away from the base plate.

7. The excavator bucket welding fixture according to claim 6, characterized in that, The lower sides of the support plate are slidably connected to clamping slides, and the clamping plate is fixedly installed on the upper part of the clamping slides. A second rotating shaft is rotatably connected to the support plate, and a gear and a rotating plate are fixedly installed on the second rotating shaft. The two ends of the rotating plate are connected to the clamping slides through connecting rods. A rack is slidably connected to the lower part of the support plate, and the rack meshes with the gear. One end of the rack is provided with a sleeve. The lower part of the support plate is installed on the bucket tooth slide through support feet. A clamping cylinder is provided on one side of the clamping slide, and the piston rod of the clamping cylinder is connected to the sleeve.

8. The excavator bucket welding fixture according to claim 7, characterized in that, The bucket tooth slide is equipped with an adjustment mechanism for synchronously and equidistantly adjusting the spacing of multiple bucket tooth clamps. The adjustment mechanism includes a scissor telescopic frame, with a second rotating shaft hinged to the middle of the scissor telescopic frame. The bucket tooth slide is equipped with a transverse guide rail. The support leg of the bucket tooth clamp located in the middle is fixedly connected to the bucket tooth slide, while the support legs of the bucket tooth clamps located on both sides of the middle are slidably engaged with the transverse guide rail. One end of the scissor telescopic frame is equipped with a drive rod, and one side of the bucket tooth slide is equipped with an adjustment cylinder. The piston rod of the adjustment cylinder is connected to the drive rod. The sleeves of adjacent bucket tooth clamps are connected by a linkage rod, and the linkage rod is slidably engaged with the sleeve.

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