A special fixture for assembling grab bucket pulley shaft

Abstract

The utility model provides a kind of special jig for grab pulley axle assembly, belong to grab manufacturing and assembly field, including portal and rammer, portal includes two interval settings' door frame, the top of two door frames is fixedly connected through two parallel cross beams, and sliding beam capable of sliding along its length direction is set between two cross beams;Two ends of sliding beam are respectively fixedly connected with an outer buckling plate, each outer buckling plate includes horizontal plate and vertical plate, horizontal plate is welded and fixed with the top surface of sliding beam end, vertical plate is connected to the side edge of horizontal plate far from sliding beam vertically downward, the horizontal plate of outer buckling plate, vertical plate and the end portion of sliding beam jointly enclose and form a slot structure with opening downward, the slot structure can be buckled on the upper of cross beam;The middle position of sliding beam is connected with rammer by iron chain, the utility model solves the problem that the impact force of rammer cannot be vertically applied to the end surface of pulley axle with the increase of pulley axle assembly depth when pulley axle is assembled.

Description

Technical Field

[0001] This utility model relates to the field of grab bucket manufacturing and assembly, and in particular to a special jig for assembling grab bucket pulley shafts. Background Technology

[0002] As the core equipment for material handling operations in industries such as ports, mines, and construction, the operational stability and service life of grab buckets directly depend on the assembly quality of key components. Among them, the assembly of the pulley shafts of the upper and lower support beams is a key process that affects the performance of grab buckets.

[0003] In existing technologies, the assembly of the upper and lower support beam pulley shafts of grab buckets mostly relies on traditional hoisting equipment. The specific process is as follows: the upper and lower support beams are hoisted to the assembly station using hoisting equipment, then the pulley shafts are suspended using hoisting tools and aligned with the bearing holes on the support beams. Finally, operators manually assist in positioning to complete the initial installation. However, during this process, the hoisting equipment is easily affected by external wind forces, operating force, and other factors, causing it to sway. This makes it difficult to accurately align the pulley shafts with the support beam holes, which not only reduces assembly efficiency but may also cause wear on parts due to repeated adjustments. To improve the hoisting sway problem, a gantry structure is used to assist assembly in some scenarios. This gantry typically consists of two vertical columns, a horizontal beam, and a matching suspension device. The beam is fixed to the top of the columns, and the tamper is suspended from the beam by a chain. In use, the upper and lower support beams must first be placed on the platform in front of the gantry. The height and horizontal position of the tamper are changed by adjusting the suspension device to align it with the pulley shaft mounting holes. Then, the tamper is swung to press the pulley shaft into the mounting holes of the upper and lower support beams.

[0004] However, during the actual assembly process, the chain is fixed in the hanging position on the gantry. As the assembly depth of the pulley shaft in the mounting holes of the upper and lower support beams gradually increases, when the hammer swings to near the end of the pulley shaft, a significant height difference will form between the hammer and the pulley shaft. Therefore, the impact force of the hammer cannot act perpendicularly on the end face of the pulley shaft, which may cause damage to the support beam hole due to the force displacement of the pulley shaft, affecting the assembly accuracy and the integrity of the parts. Utility Model Content

[0005] This application provides a special jig for assembling grab bucket pulley shafts, which solves the technical problem in the prior art that, as the assembly depth of the pulley shaft increases, the impact force of the tamping hammer cannot be applied perpendicularly to the end face of the pulley shaft; it also enables adjustment of the chain suspension position and improves assembly accuracy.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a special fixture for assembling a grab bucket pulley shaft, including a gantry and a tamping hammer. The gantry includes two spaced-apart portal frames, the tops of which are fixedly connected by two parallel crossbeams. A movable beam that can slide along its length is provided between the two crossbeams. An outer buckle plate is fixedly connected to each end of the movable beam. Each outer buckle plate includes a horizontal plate and a vertical plate. The horizontal plate is welded and fixed to the top surface of the end of the movable beam. The vertical plate is vertically connected to the edge of the horizontal plate away from the movable beam. The horizontal plate, vertical plate, and end of the movable beam together form a downward-opening groove structure. The groove structure can be fastened to the crossbeam. The middle part of the movable beam is connected to the tamping hammer by an iron chain.

[0007] When using this invention, if the position of the tamping hammer needs to be adjusted as the assembly depth increases to ensure vertical impact, the tightening bolts can be loosened to push the movable beam to slide along the crossbeam to adjust the front and rear position of the tamping hammer. Since the movable beam forms a sliding fit with the crossbeam through the outer buckle plate, and the inner buckle plate and the outer buckle plate together form a lateral limit on the crossbeam, the movable beam can move flexibly and stably along the length of the crossbeam. Therefore, it can ensure that the tamping hammer is always accurately aligned with the end face of the pulley shaft, ensuring that the impact force acts vertically, avoiding damage to the bearing beam hole, and improving assembly accuracy.

[0008] As a further improvement to the above solution, an inner buckle plate is welded and fixed to each end of the movable beam. The inner buckle plate is a rectangular plate structure. One edge of the inner buckle plate is fixedly connected to the side of the end of the movable beam by welding, and the outer surface of the inner buckle plate is flush with the end of the movable beam. This can effectively prevent the movable beam from shifting laterally when sliding along the crossbeam and ensure the stability of the movable beam during the sliding process.

[0009] As a further improvement to the above solution, a threaded hole is provided in the middle of each inner buckle plate. A tightening bolt is installed in the threaded hole of the inner buckle plate through threaded engagement. The length of the tightening bolt is greater than the distance between the inner buckle plate and the side of the crossbeam. When the tightening bolt is rotated, its end can be vertically tightened against the side of the crossbeam. This can quickly lock the position of the movable beam, prevent it from sliding when impacted by the hammer, and facilitate loosening and adjustment at any time.

[0010] As a further improvement to the above solution, an upper pull seat is welded and fixed at the bottom middle position of the movable beam. The upper pull seat has a through hole, and an upper pin passes through the through hole. An upper pull ring is rotatably connected to the upper pin, and the upper end of the iron chain is wrapped around the upper pull ring.

[0011] The ram is a cylindrical columnar structure. A pull-down seat is welded and fixed to the top surface of the middle part of the ram. A through hole is opened on the pull-down seat. A lower pin passes through the through hole of the pull-down seat. A pull-down ring is rotatably connected to the lower pin. The lower end of the iron chain is wrapped around the pull-down ring.

[0012] As a further improvement to the above solution, the special jig for assembling the grab bucket pulley shaft also includes a support mechanism capable of clamping and fixing the upper and lower support beams of the grab bucket. The support mechanism includes a support frame with a rectangular frame structure, which is welded end to end by four steel sections. Lateral supports are fixed on the left and right sides of the support frame, and each lateral support is provided with a threaded hole. A tightening screw is installed in the threaded hole of the lateral support, with the front end of the tightening screw pointing inward to the inside of the support frame. Thus, the upper and lower support beams of the grab bucket can be clamped and fixed from both sides by rotating the tightening screw, preventing the support beams from shaking or shifting during assembly.

[0013] As a further improvement to the above solution, two lateral supports are respectively provided on the left and right frames of the support frame. The two lateral supports are distributed at intervals along the length of the support frame, and a tightening screw is installed on each lateral support. This allows clamping force to be applied from different positions along the length of the beam, making the beam more evenly stressed.

[0014] As a further improvement to the above solution, the support mechanism also includes clamping blocks in the same number as the clamping screws. The clamping blocks are located inside the support frame, and one end of the clamping block can abut against one end of the clamping screw. The other end of the clamping block away from the clamping screw can contact the side of the upper and lower support beams of the grab bucket. The clamping blocks can prevent the clamping screw from directly contacting the support beam and causing surface scratches, while increasing the contact area with the support beam, making the clamping force more uniform and improving the fixing effect.

[0015] As can be seen from the above technical solutions, this utility model has at least the following technical effects or advantages: 1. When using this utility model, if the position of the tamping hammer needs to be adjusted to ensure vertical impact as the pulley shaft increases with the assembly depth, the tightening bolt can be loosened to push the movable beam to slide along the crossbeam to adjust the front and rear position of the tamping hammer. Since the movable beam forms a sliding fit with the crossbeam through the outer buckle plate, and the inner buckle plate and the outer buckle plate together form a lateral limit on the crossbeam, the movable beam can move flexibly and stably along the length of the crossbeam. Therefore, it can ensure that the tamping hammer is always accurately aligned with the end face of the pulley shaft, ensuring that the impact force acts vertically, avoiding damage to the bearing beam hole, and improving assembly accuracy.

[0016] 2. Since each end of the movable beam is welded and fixed with an inner buckle plate, the outer plate of the inner buckle plate is flush with the end of the movable beam and forms a relatively parallel structure with the vertical plate of the outer buckle plate. Together, they surround both sides of the crossbeam, forming a reliable lateral limit for the movable beam. Therefore, it can effectively prevent the movable beam from shifting laterally when sliding along the crossbeam and ensure the stability of the movable beam during the sliding process.

[0017] 3. Since the threaded hole of the inner buckle plate is fitted with a tightening bolt, and the length of the tightening bolt is greater than the distance between the inner buckle plate and the side of the crossbeam, rotating the tightening bolt can make its end perpendicular to the side of the crossbeam, thus quickly locking the position of the movable beam and preventing it from sliding when impacted by the hammer, while also making it easy to loosen and adjust at any time. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the movable beam in this utility model; Figure 3 for Figure 1 A magnified view of a section at point A in the middle; Figure 4 for Figure 1 A magnified view of a section at point B in the middle; Figure 5 This is a schematic diagram of the support mechanism in this utility model; Figure 6 for Figure 5 A schematic diagram of the structure behind the hidden support block.

[0019] Explanation of reference numerals in the attached drawings: 1. Portal frame; 101. Portal frame; 102. Crossbeam; 2. Hammer; 3. Movable beam; 4. Outer buckle plate; 401. Horizontal plate; 402. Vertical plate; 5. Chain; 6. Inner buckle plate; 7. Tightening bolt; 8. Upper pull seat; 9. Upper pin; 10. Upper pull ring; 11. Lower pull seat; 12. Lower pin; 13. Lower pull ring; 14. Support frame; 15. Lateral support; 16. Tightening screw; 17. Tightening block. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0021] This utility model discloses a special jig for assembling the pulley shaft of a grab bucket, which includes a gantry 1, a tamping hammer 2, a movable beam 3, and a support mechanism.

[0022] like Figure 1 As shown, the gantry 1 serves as the supporting frame for the entire fixture, comprising two portal frames 101 arranged side-by-side. Each portal frame 101 is welded together from two vertical rods and a top horizontal rod. The two vertical rods are vertically welded to both ends of the top horizontal rod, forming a "gate" shape, with the bottom of the vertical rods contacting the ground. The tops of the two portal frames 101 are fixedly connected by two parallel horizontal beams 102. The two ends of the horizontal beams 102 are welded to the top horizontal rods of the two portal frames 101, forming a closed rectangular frame structure at the top of the entire gantry 1.

[0023] A movable beam 3 is installed between the two crossbeams 102. For example... Figure 2 As shown, both ends of the movable beam 3 are fixedly connected to outer fastening plates 4, which include a horizontal plate 401 and a vertical plate 402. The horizontal plate 401 is fixed to the top surface of the end of the movable beam 3 by welding, and the vertical plate 402 is vertically welded to the side of the horizontal plate 401 away from the movable beam 3, so that the outer fastening plates 4 and the end of the movable beam 3 together form a downward-facing groove structure. The groove structure can be fastened to the top of the crossbeam 102, and a certain gap is reserved between the groove structure and the crossbeam 102 to ensure that the movable beam 3 can move along the length of the crossbeam 102. The bottom surface of the middle part of the movable beam 3 is connected to the tamping hammer 2 by an iron chain 5. The length of the iron chain 5 can be adjusted according to the actual assembly requirements to ensure that the tamping hammer 2 can accurately act on the pulley shaft.

[0024] To prevent lateral displacement when the movable beam 3 slides, an inner clamping plate 6 is welded and fixed to the end of the movable beam 3. For example... Figure 2 As shown, the inner buckle plate 6 is a rectangular steel plate, with one edge welded and fixed to the side of the end of the movable beam 3, and the outer surface of the inner buckle plate 6 is flush with the end face of the movable beam 3. Thus, the inner buckle plate 6 and the vertical plate 402 of the outer buckle plate 4 form a relatively parallel structure, and the distance between them is adapted to the width of the crossbeam 102, together surrounding both sides of the crossbeam 102, realizing the lateral limitation of the movable beam 3 and preventing it from shifting when sliding or under force.

[0025] To secure the movable beam 3, the inner buckle plate 6 is also provided with threaded holes, and a tightening bolt 7 is installed in these threaded holes through threaded engagement. Figure 2 As shown, the threaded hole is located in the middle of the inner buckle plate 6, and its diameter matches the nominal diameter of the tightening bolt 7. A circular pad can be provided at the end of the tightening bolt 7 to increase the contact area with the crossbeam 102. After the movable beam 3 is adjusted to the target position, the tightening bolt 7 is rotated clockwise to make the pad at its end tightly press against the side of the crossbeam 102, locking the position of the movable beam 3 through friction. If readjustment is required, simply rotate the tightening bolt 7 counterclockwise to disengage its end from the crossbeam 102, allowing the movable beam 3 to slide again. This structure is easy to operate, requiring no additional tools for fixing and loosening, effectively improving operational efficiency.

[0026] To ensure that the hammer 2 can be flexibly adjusted in angle during operation, the connection between the movable beam 3 and the chain 5 adopts a rotatable structure. Specifically, an upper pull seat 8 is welded to the bottom middle position of the movable beam 3, such as... Figure 3 As shown, the upper pull seat 8 has a through hole; an upper pin 9 passes through the through hole, and both ends of the upper pin 9 have shoulders (with a diameter larger than the diameter of the through hole of the upper pull seat) to prevent it from falling out of the through hole; an upper pull ring 10 is fitted on the upper pin 9, and the upper pull ring 10 can rotate freely around the upper pin 9. The upper end of the iron chain 5 passes around the upper pull ring 10, so that the iron chain 5 can adjust its angle as the upper pull ring 10 rotates.

[0027] The ramming hammer 2 is a columnar structure, with a pull-down seat 11 welded to its top surface, such as... Figure 4 As shown, the pull-down base 11 is a steel plate with a through hole through which a lower pin 12 passes. Both ends of the lower pin 12 also have shoulders. A pull-down ring 13 is fitted onto the lower pin 12, and the pull-down ring 13 can rotate freely around the lower pin 12. The lower end of the chain 5 passes over the pull-down ring 13. Thus, through the rotational engagement of the upper pull-down ring 10 and the upper pin 9, and the rotational engagement of the pull-down ring 13 and the upper pin 12, the angle of the chain 5 can be flexibly adjusted, effectively avoiding assembly errors caused by angular deviations.

[0028] To prevent the upper and lower support beams of the grab bucket from wobbling during assembly, this utility model also includes a support mechanism for clamping the support beams. For example... Figure 5 , Figure 6 As shown, the support mechanism includes a support frame 14, lateral supports 15, tightening screws 16, and tightening blocks 17. The support frame 14 is a rectangular frame welded from four steel sections. Two lateral supports 15 (four in total) are welded to each side of the support frame 14 along its length. Each lateral support 15 is a steel block with threaded holes, the axis of which is perpendicular to the side of the support frame 14. A tightening screw 16 is threaded onto each lateral support 15.

[0029] The support frame 14 has four clamping blocks 17 (corresponding one-to-one with the clamping screws 16). Each clamping block 17 is a cuboid structure, with a groove on one side near the clamping screw 16 that fits a hemispherical protrusion, and a flat surface on the other side that mates with the side of the upper and lower support beams of the grab bucket. In use, the upper and lower support beams of the grab bucket are placed inside the support frame 14. The four clamping screws 16 are rotated, causing their hemispherical protrusions to embed into the grooves of the clamping blocks 17, pushing the clamping blocks 17 towards the side of the support beam until they are in close contact, clamping and fixing the beam. Because the four clamping screws 16 are symmetrically distributed (two on each side, evenly arranged along the length), the beam is subjected to uniform force, avoiding tilting caused by unilateral force and ensuring the beam remains stable during assembly. Simultaneously, the clamping blocks 17 prevent the clamping screws 16 from directly contacting the beam, preventing scratches on the beam surface.

[0030] The overall workflow of this utility model in use is as follows: First, place the upper and lower support beams of the grab bucket within the support frame 14 of the support mechanism. Rotate the tightening screw 16 on the lateral support 15 to clamp and fix the support beams via the tightening block 17. Then, pre-place the pulley shaft at the bearing hole of the support beam. Next, according to the dimensions of the upper and lower support beams of the grab bucket to be assembled and the position of the pulley shaft mounting hole, loosen the tightening bolt 7 and push the movable beam 3 to slide along the crossbeam 102 of the gantry 1, bringing the tamping hammer 2 close to the pulley shaft. Then, by controlling the tamping hammer 2, use the impact force to precisely press the pulley shaft into the mounting hole of the support beam to complete the assembly. Finally, rotate the tightening screw 16 in the opposite direction to loosen the support beam. If other models of grab buckets need to be assembled, repeat the above steps.

[0031] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in its embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A special jig for assembling a grab bucket pulley axle, comprising a gantry (1) and a rammer (2), characterized in that, The gantry (1) includes two spaced-apart portal frames (101). The tops of the two portal frames (101) are fixedly connected by two parallel crossbeams (102). A movable beam (3) that can slide along its length is provided between the two crossbeams (102). An outer buckle plate (4) is fixedly connected to each end of the movable beam (3). Each outer buckle plate (4) includes a horizontal plate (401) and a vertical plate (402). The horizontal plate (401) is welded and fixed to the top surface of the end of the movable beam (3). The vertical plate (402) is vertically connected to the edge of the horizontal plate (401) away from the movable beam (3). The horizontal plate (401), the vertical plate (402) of the outer buckle plate (4) and the end of the movable beam (3) together form a groove structure with the opening facing downward. The groove structure can be fastened to the crossbeam (102). The middle position of the movable beam (3) is connected to the tamping hammer (2) by an iron chain (5).

2. The special jig for assembling the pulley shaft of a grab bucket according to claim 1, characterized in that, Each end of the movable beam (3) is also welded and fixed with an inner buckle plate (6). The inner buckle plate (6) is a rectangular plate structure. One side edge of the inner buckle plate (6) is fixedly connected to the side of the end of the movable beam (3) by welding. The outer plate surface of the inner buckle plate (6) is flush with the end of the movable beam (3).

3. The special jig for assembling the pulley shaft of a grab bucket according to claim 2, characterized in that, Each inner buckle plate (6) has a threaded hole in the middle. A tightening bolt (7) is installed in the threaded hole of the inner buckle plate (6) by thread engagement. The length of the tightening bolt (7) is greater than the distance between the inner buckle plate (6) and the side of the crossbeam (102). When the tightening bolt (7) is rotated, its end can be vertically tightened against the side of the crossbeam (102).

4. The special jig for assembling the pulley shaft of a grab bucket according to claim 1, characterized in that, The upper pull seat (8) is welded and fixed at the bottom middle position of the movable beam (3). The upper pull seat (8) has a through hole, and an upper pin (9) passes through the through hole of the upper pull seat (8). An upper pull ring (10) is rotatably connected to the upper pin (9), and the upper end of the iron chain (5) is wrapped around the upper pull ring (10).

5. A special jig for assembling a grab bucket pulley shaft according to claim 4, characterized in that, The ram (2) is a cylindrical column structure. A pull-down seat (11) is welded and fixed on the top surface of the middle part of the ram (2). A through hole is opened on the pull-down seat (11). A lower pin (12) passes through the through hole of the pull-down seat (11). A pull-down ring (13) is rotatably connected to the lower pin (12). The lower end of the iron chain (5) is wrapped around the pull-down ring (13).

6. A special jig for assembling a grab bucket pulley shaft according to any one of claims 1 to 5, characterized in that, It also includes a support mechanism that can clamp and fix the upper and lower support beams of the grab bucket. The support mechanism includes a support frame (14) with a rectangular frame structure. The support frame (14) is welded from four steel sections. Lateral supports (15) are fixed on the left and right sides of the support frame (14). Each lateral support (15) is provided with a threaded hole. A tightening screw (16) is installed in the threaded hole of the lateral support (15). The front end of the tightening screw (16) points to the inside of the support frame (14).

7. A special jig for assembling a grab bucket pulley shaft according to claim 6, characterized in that, The support frame (14) has two lateral supports (15) on its left and right sides respectively. The two lateral supports (15) are distributed at intervals along the length of the support frame (14), and each lateral support (15) is equipped with a tightening screw (16).

8. A special jig for assembling a grab bucket pulley shaft according to claim 7, characterized in that, The support mechanism also includes a number of clamping blocks (17) equal to the number of clamping screws (16). The clamping blocks (17) are located inside the support frame (14). One end of the clamping block (17) can abut against one end of the clamping screw (16). The other end of the clamping block (17) away from the clamping screw (16) can contact the side of the upper and lower support beams of the grab bucket.

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