Synchronous dismounting and replacing device of bulldozer scraper knife bushing

Abstract

The invention discloses a synchronous dismounting and replacing device for a bulldozer scraper knife bushing in the technical field of bushing dismounting and mounting tools, the device comprises a cylindrical sleeve shell, a lengthened bolt, a limiting gasket and a transition gasket, a cylindrical containing groove and a threaded hole for containing an old bushing are formed in the cylindrical sleeve shell, the limiting gasket is matched with the transition gasket, and the lengthened bolt is arranged in the cylindrical containing groove. A replacement position is formed on the lengthened bolt and used for placing a new buffering lining in advance, in the working state, a threaded rod of the lengthened bolt sequentially penetrates through the new lining and the old lining and then is screwed into the threaded hole, and the old lining embedded in the tool apron is pulled into the cylindrical containing groove by rotating the cylindrical sleeve shell and utilizing axial tension generated by a thread pair. And the new lining located at the replacement position is synchronously pushed into the through hole of the tool apron, and the push-in end point of the new buffering lining is limited by the limiting gasket abutting against the outer wall of the tool apron. According to the device, disassembly and assembly are combined into one continuous step, step redundancy and manual alignment links are eliminated, and the replacement efficiency of the bushing is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of bushing removal and installation tools, and specifically to a synchronous replacement device for bulldozer blade bushings. Background Technology

[0002] When bulldozers and other heavy construction machinery operate in harsh environments such as metal mines, the buffer bushings (sleeves) at the blade connection are prone to wear and deformation due to long-term exposure to enormous impact loads, high-frequency vibrations, and corrosion from acidic water and other environments. This can lead to loosening of bolt connections and accelerate the elliptical or out-of-round deformation of the bolt holes in the blade holder body. To ensure the safety and efficiency of bulldozer operations, the bushings need to be replaced frequently and quickly.

[0003] In the existing technology, the removal of bushings usually relies on two types of tools: one is the traditional puller (puller), but because the bushing is interference-fitted into the hole of the thick metal plate, it lacks an effective gripping edge, making the puller difficult to use; the other is a bolt-sleeve spiral puller, which uses a bolt to pass through the center hole of the bushing and screw into the threaded hole of the sleeve, and pulls out the bushing by rotating the sleeve.

[0004] However, existing spiral tools have significant efficiency bottlenecks in actual maintenance operations: the removal and installation of bushings must be two separate and time-consuming steps.

[0005] First, the operator needs to use tools to pull out and remove the old bushing. Then, after removing the old bushing, the new bushing is aligned with the hole, and the new bushing is installed in place using a driving or pressing tool.

[0006] This step-by-step operation relies on manual alignment of the bushing with the hole when installing a new bushing. During the second alignment and pressing of the bushing in, problems such as oblique pressing or insufficient pressing can easily occur, thus affecting the efficiency of bushing replacement. Summary of the Invention

[0007] The purpose of this invention is to provide a synchronous replacement device for bulldozer blade bushings, so as to solve the problems of low overall maintenance efficiency caused by the separation of bushing disassembly and installation steps, time consumption, and low efficiency of manual alignment in the prior art.

[0008] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A synchronous replacement device for bulldozer blade bushings includes: A cylindrical sleeve has a cylindrical receiving groove formed inside it, which extends in the axial direction. The axial length of the cylindrical receiving groove is less than the axial length of the cylindrical sleeve. The cylindrical receiving groove opens at one end face of the cylindrical sleeve. A threaded hole is formed at the other end of the cylindrical sleeve, which extends through the cylindrical receiving groove. The axes of the threaded hole, the cylindrical receiving groove, and the cylindrical sleeve are coincident. The axial length of the cylindrical receiving groove is at least greater than the axial length of a buffer bushing. The diameter of the cylindrical receiving groove is greater than the diameter of the buffer bushing. The length of the threaded shank of the extended bolt shall not be less than the total axial length of the cylindrical receiving groove and the two buffer bushings; A limiting washer is fitted onto the outside of the extension bolt, and the outer diameter of the limiting washer is larger than the outer diameter of the buffer bushing. Transition shims are fitted onto the outside of the extension bolts. The outer diameter of the transition shims is larger than the outer diameter of the buffer bushing, but smaller than the outer diameter of the buffer bushing. Among them, the limiting washer is close to the cap end of the extension bolt, and a replacement position is formed between the limiting washer and the transition washer. The replacement position is used for a new buffer bushing to be fitted onto the extension bolt. When the quick-release device is in operation, the threaded rod of the extended bolt passes through a new buffer bushing, a buffer bushing embedded in the tool holder, and a cylindrical receiving groove in sequence before being screwed into the threaded hole. The cylindrical sleeve and the extended bolt form a helical drive pair through the threaded hole. By rotating the cylindrical sleeve, the head end of the bolt applies an axial tensile force to the buffer bushing, so as to pull the old buffer bushing embedded in the tool holder into the cylindrical receiving groove, and simultaneously push the new buffer bushing located in the replacement position into the first through hole on the tool holder. The end point of the new buffer bushing being pushed in is limited by the limiting washer abutting against the outer wall of the tool holder.

[0009] Furthermore, the cylindrical sleeve with threaded holes is composed of a semi-circular fixing part and a semi-circular mating part. A threaded half-hole that runs through the axis is formed at the center of both the semi-circular fixing part and the semi-circular mating part. The two threaded half-holes mat together to form a threaded hole. The semi-circular fixing part is part of the cylindrical shell body. One end of the semi-circular mating part and one end of the semi-circular fixing part are hinged together. The semi-circular mating part can rotate around the hinge so that the semi-circular mating part and the semi-circular fixing part are mated to form the complete cylindrical outline of the cylindrical shell. The free end of the semicircular mating part and the non-hinged end of the semicircular fixed part are connected by a locking mechanism.

[0010] Furthermore, a handle is connected to the outer wall of the cylindrical casing. The axial direction of the handle is perpendicular to the axial direction of the cylindrical casing, and one end of the handle extends away from the cylindrical casing to form a lever arm for rotating the cylindrical casing.

[0011] Furthermore, a countersunk groove is formed on the outer side of both the semicircular mating part and the semicircular fixing part in the axial direction. The countersunk groove extends through the semicircular mating part and the semicircular fixing part in a direction perpendicular to the axial direction of the threaded hole. When the semicircular mating part and the semicircular fixing part are mated, the two countersunk grooves together form a receiving through groove for one end of the handle to be inserted, so that the handle can be non-fixedly connected to the cylindrical sleeve.

[0012] Furthermore, the recess is located at the free end of the semi-circular mating part and the semi-circular fixed part, and the locking mechanism includes: V-groove, there are two V-grooves, and the two V-grooves are symmetrically arranged on both sides of one end of the handle; Two T-shaped wedges are symmetrically arranged on the two inner walls of the receiving groove. Each T-shaped wedge is divided into two parts by the mating surfaces of a semi-circular fixing part and a semi-circular mating part. The width of the groove is greater than the width of the handle so that the handle can rotate freely within the groove. As the handle rotates the cylindrical sleeve, the corresponding groove wall of the V-shaped groove and the corresponding inclined wall of the T-shaped wedge engage in a wedge-tight fit. The wedge-tight fit utilizes the relative rotation angle of the handle within the receiving groove to generate a radial wedge-tight force, so that the semi-circular mating part and the semi-circular fixing part are tightly engaged.

[0013] Furthermore, the T-shaped wedge has an angled structure at the intersection with the end face of the cylindrical sleeve to guide the V-shaped groove of the handle into the receiving groove.

[0014] Furthermore, a rubber centering bushing is fitted on the outer side of the extended bolt. The rubber centering bushing is used to fill the cylindrical gap between the buffer bushing and the extended bolt to maintain the coaxiality of the extended bolt and the buffer bushing.

[0015] Furthermore, a planar bearing is fixedly installed at the end of the cylindrical sleeve away from the threaded hole. The planar bearing and the cylindrical sleeve are arranged coaxially, and the bearing race protrudes from the end face of the cylindrical sleeve.

[0016] Furthermore, the thrust bearing is a roller bearing, and a thickened portion is formed at the open end of the cylindrical housing. An annular groove for the mounting of the thrust bearing ring is formed on the end face of the thickened portion.

[0017] Furthermore, the annular groove is divided into a first annular cavity and a second annular cavity in its axial direction. The second annular cavity is connected to the end face of the cylindrical sleeve. The diameter of the first annular cavity is smaller than the diameter of the second annular cavity. The junction between the two is smoothly transitioned with an oblique angle feature. The thickness of the first annular cavity is the thickness of the bearing ring. The bearing seat is located in the second annular cavity, and the end face of the bearing seat protrudes axially from the second annular cavity.

[0018] The beneficial effects of this invention are: This invention establishes a replacement position using limiting and transition shims, and, in conjunction with extended bolts, integrates the pulling out of the old bushing and the pushing in of the new bushing into a continuous helical transmission process, achieving synchronous in-situ replacement of the old and new bushings. This method completely eliminates the redundancy of disassembly and installation steps in traditional step-by-step operations, avoids the need for manual re-alignment of the new bushing, and utilizes the axial pushing force of the bolt cap end to ensure the alignment and pressing accuracy of the new bushing, thereby significantly improving the bushing replacement efficiency. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 An exploded view of the three-dimensional structure of the shovel assembly; Figure 2 A planar sectional view of the buffer bushing connection of the blade assembly; Figure 3 This is a planar sectional view of an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 5 This is a plan view of the handle wedge structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the principle of handle rotation and wedging in an embodiment of the present invention; Figure 7 This is a plan view of an embodiment of the present invention; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point B in the diagram; Figure 9 for Figure 3 Enlarged schematic diagram of the structure at point A in the diagram; The labels in the figure represent the following: 1-tool holder; 1a-first through hole; 2-tool plate; 2a-second through hole; 3-bolt; 4-washer; 5-nut; 6-buffer bushing; 7-cylindrical sleeve; 7a-semi-circular fixing part; 7b-semi-circular mating part; 7c-counterpart; 7d-T-shaped wedge; 7e-angled structure; 8-cylindrical receiving groove; 9-threaded hole; 9a-threaded half hole; 10-handle; 10a-V-groove; 11-plane bearing; 12-extended bolt; 13-rubber centering bushing; 14-thickened part; 15-annular counterpart; 16-first annular cavity; 17-second annular cavity; 18-angled feature; 19-limiting washer; 20-transition washer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The synchronous replacement device of this invention is specifically designed for bulldozer blade assemblies with replaceable blades, as described above. Figure 1 and Figure 2 The blade assembly includes a blade holder 1 and several blade plates 2.

[0023] Specifically, the lower edge of the tool holder 1 has several sets of equally spaced first through holes 1a. Each tool plate 2 is fixed to the tool holder 1 by several sets of connecting components. The core component of the connecting component is a buffer bushing 6, which is interference-fitted into the corresponding first through hole 1a.

[0024] This design allows the buffer bushing 6 to act as the first buffer layer, utilizing its toughness to absorb the enormous impact force generated when the blade strikes, thereby effectively protecting the bolt holes on the blade holder 1 from elliptical or out-of-round deformation.

[0025] The specific connection method between the blade plate 2 and the blade holder 1 is as follows: the threaded rod of the bolt 3 passes through the second through hole 2a on the blade plate 2 and the buffer bushing 6 embedded in the blade holder 1 in sequence. The nut 5 is tightened at one end of the bolt 3 that protrudes from the blade holder 1, and is pre-tightened and positioned by the washer 4.

[0026] To ensure that the buffer bushing 6 can participate in axial buffering to the maximum extent and maintain its own stability, the axial length of the buffer bushing 6 is designed to be consistent with the length of the first through hole 1a, so that its two ends are flush with the outer walls of both sides of the tool holder 1. This structure ensures that the bushing can withstand and transmit the axial preload when the nut 5 is tightened, improving the reliability of the connection and its impact resistance.

[0027] Because this buffer bushing 6 adopts a high-strength interference fit design, its replacement is difficult and time-consuming. Therefore, this embodiment needs to provide a synchronous replacement device to perform on-site replacement operations.

[0028] This embodiment provides a synchronous replacement device for bulldozer blade bushings, which aims to solve the problems of low overall maintenance efficiency caused by the separation of bushing disassembly and installation steps, time consumption, and low efficiency of manual alignment in the prior art.

[0029] Specifically, refer to Figures 3 to 9The synchronous replacement device for the bulldozer blade bushing includes: A cylindrical sleeve 7 has a cylindrical receiving groove 8 formed inside it, which extends in the axial direction. The axial length of the cylindrical receiving groove 8 is less than the axial length of the cylindrical sleeve 7. The cylindrical receiving groove 8 opens at one end face of the cylindrical sleeve 7. A threaded hole 9 is formed at the other end of the cylindrical sleeve 7, which extends to the cylindrical receiving groove 8. The axes of the threaded hole 9, the cylindrical receiving groove 8 and the cylindrical sleeve 7 are coincident. The axial length of the cylindrical receiving groove 8 is at least greater than the axial length of a buffer bushing 6. The diameter of the cylindrical receiving groove 8 is greater than the diameter of the buffer bushing 6. The length of the threaded rod of the extended bolt 12 is not less than the total axial length of the cylindrical receiving groove 8 and the two buffer bushings 6; Limiting gasket 19 is sleeved on the outside of the extension bolt 12, and the outer diameter of the limiting gasket 19 is larger than the outer diameter of the buffer bushing 6. Transition shim 20 is sleeved on the outside of extension bolt 12. The outer diameter of transition shim 20 is larger than the inner diameter of buffer bushing 6 and smaller than the outer diameter of buffer bushing 6. Among them, the limiting washer 19 is close to the cap end of the extension bolt 12, and a replacement position is formed between the limiting washer 19 and the transition washer 20. The replacement position is used for a new buffer bushing 6 to be fitted onto the extension bolt 12.

[0030] When the device is in operation, the threaded rod of the extended bolt 12 passes sequentially through a new buffer bushing 6, a buffer bushing 6 embedded in the tool holder, and a cylindrical receiving groove 8 before being screwed into the threaded hole 9. The new buffer bushing 6 is fitted onto the extended bolt 12 and is located between the limiting washer 19 and the transition washer 20.

[0031] The transition shim 20, with its outer diameter smaller than that of the old bushing and larger than its inner diameter, is used to contact the end faces of the new and old bushings, ensuring that the axial thrust can be applied evenly to the old bushing. At the same time, the outer diameter design of the transition shim 20 prevents it from getting stuck on the outer wall of the tool holder during the insertion process.

[0032] Furthermore, a helical drive pair is formed between the cylindrical sleeve 7 and the extended bolt 12 through the threaded hole 9. By rotating the cylindrical sleeve 7, the head end of the bolt applies an axial tensile force to the buffer bushing 6, so as to pull the old buffer bushing 6 embedded on the tool holder into the cylindrical receiving groove 8, and simultaneously push the new buffer bushing 6 located in the replacement position into the first through hole on the tool holder. The end point of the new buffer bushing 6 being pushed in is limited by the limiting washer 19 abutting against the outer wall of the tool holder.

[0033] This design combines the removal of the old bushing and the installation of the new bushing into a continuous, synchronous process. While the old bushing is being pulled out, the new bushing is pushed into place using the same axial force. This method eliminates the separate steps of removal and installation found in traditional tools, saves the need for manual re-alignment of the new bushing, and ensures the correct installation depth of the new bushing through the limiting shim 19.

[0034] However, in the above scheme, after the old bushing is pulled into the cylindrical receiving groove 8, the operator needs to completely unscrew the extension bolt 12 from the threaded hole 9 in order to remove the old bushing and the separation tool. The length of the extension bolt 12 unscrewed in the reverse direction is at least greater than the total axial length of a bushing. This unscrewing process is very time-consuming. Moreover, several buffer bushings 6 need to be replaced for just one blade. As a result, a lot of time is wasted in the process of separating the extension bolt 12 during the replacement process of all buffer bushings 6 of multiple blades on a single tool holder, which seriously restricts the efficiency of on-site replacement.

[0035] To solve the problem of excessive bolt removal time, the cylindrical sleeve 7 with threaded hole 9 is composed of a semi-circular fixing part 7a and a semi-circular mating part 7b. A threaded half hole 9a that runs through the axial direction is formed at the center of both the semi-circular fixing part 7a and the semi-circular mating part 7b. The two threaded half holes 9a are mated to form threaded hole 9.

[0036] The semicircular fixing part 7a is part of the main body of the cylindrical shell 7. One end of the semicircular mating part 7b is hinged to one end of the semicircular fixing part 7a. The semicircular mating part 7b can rotate around the hinge so that the semicircular mating part 7b and the semicircular fixing part 7a mate to form the complete cylindrical outline of the cylindrical shell 7. The free end of the semicircular mating part 7b and the non-hinged end of the semicircular fixing part 7a are connected by a locking mechanism.

[0037] After the bushing replacement is completed, the extension bolt 12 and the cylindrical sleeve 7 should be quickly separated to remove the old bushing and prepare for the next operation.

[0038] First, release the quick-release mechanism lock between the handle 10 and the cylindrical sleeve 7 (including but not limited to screw fastening and quick-release buckle locking / unlocking methods), rotate the semi-circular mating part 7b around the hinge axis, so that the complete outline of the threaded hole 9 is fully opened.

[0039] The key is that the diameter of the cylindrical receiving groove 8 inside the cylindrical sleeve 7 is designed to be greater than the outer diameter of the buffer bushing 6. More specifically, the difference between their radii is designed to be greater than the radial depth of the threaded hole 9 (i.e., the radial height or engagement depth of the thread), so that when the threaded hole 9 is opened, the extended bolt 12 has a greater amount of movement redundancy in the cylindrical receiving groove 8 than this difference.

[0040] Because of this redundancy, when the semicircular mating part 7b of the threaded hole 9 is opened, the cylindrical sleeve 7 only needs to move or shake slightly in the radial direction to cause the remaining threaded half hole 9a in the threaded hole 9 to disengage radially from the threaded rod of the extended bolt 12, thus instantly releasing the thread engagement.

[0041] At this point, there is no longer a threaded transmission relationship between the cylindrical sleeve 7 and the extended bolt 12. The cylindrical sleeve 7 can then quickly and unobstructedly exit the threaded rod of the extended bolt 12 along the axial direction. After the cylindrical sleeve 7 exits, the extended bolt 12 is quickly pulled away from the other side of the tool holder. At the same time, the old buffer bushing 6 and gaskets and other components located on the extended bolt 12 on the other side will fall off freely, thereby greatly improving the efficiency of the entire maintenance process.

[0042] In the above embodiment, since the cylindrical sleeve 7 is the power component for pulling and pushing, it is necessary to rotate the cylindrical sleeve 7 to generate pulling force. If the outer surface of the cylindrical sleeve 7 is smooth, it will be very difficult to apply torque manually. In order to facilitate the application of force, a hexagonal surface structure can be formed on the outer wall of the cylindrical sleeve 7 so that sufficient torque can be applied to it using standard tools such as wrenches.

[0043] Although the outer surface of the cylindrical sleeve 7 can be formed with a hexagonal structure to accommodate the torque applied by an external wrench, this method requires carrying an additional wrench. If the wrench is lost or the model is incompatible, the tool will be unusable, affecting the timeliness of maintenance. To address this, this embodiment provides an optimized solution with a built-in lever arm. Specifically, a handle 10 is fixedly connected (including but not limited to insertion and threaded insertion) to the outer wall of the cylindrical sleeve 7. The axial direction of the handle 10 is perpendicular to the axial direction of the cylindrical sleeve 7, and one end extends away from the cylindrical sleeve 7 to form a fixed, dedicated lever arm.

[0044] The handle 10, through its integrated lever, allows operators to directly and conveniently apply powerful torque far exceeding the grip capacity of their hands, completely eliminating the reliance on external wrenches or special tools and greatly enhancing the independence of the tool and the convenience of on-site operation.

[0045] However, in the above-mentioned torque application scheme, the handle 10 is only used as a tool for applying rotational force, while the locking of the split part of the cylindrical sleeve 7 requires a separate locking mechanism (such as bolt tightening or quick-release buckle). This design of separating the force-applying component and the locking component means that each bushing replacement operation requires the operator to manually complete the locking or unlocking steps first, making the operation process complex and redundant.

[0046] Therefore, in order to further improve the structural integration of the tool, reduce the number of parts, and completely eliminate the independent locking steps, this embodiment further provides a highly integrated solution: the rotation force application function of the handle 10 is highly integrated with the locking function of the separate structure, thereby significantly simplifying the operation steps and making the tool structure more compact and reliable.

[0047] Specifically, a countersunk groove 7c is formed on the outer side of both the semicircular mating portion 7b and the semicircular fixing portion 7a in the axial direction. The countersunk groove 7c extends through the semicircular mating portion 7b and the semicircular fixing portion 7a in a direction perpendicular to the axial direction of the threaded hole 9. When the semicircular mating portion 7b and the semicircular fixing portion 7a are mated, the two countersunk grooves 7c together form a receiving groove for one end of the handle 10 to be inserted, so that the handle 10 can be non-fixedly connected to the cylindrical sleeve 7. This design makes the handle 10 a pluggable component, providing a structural basis for the subsequent synchronous locking of the handle 10 by rotation.

[0048] Furthermore, during the pulling process, the threaded pair will be subjected to a huge axial tensile force, which will attempt to separate the semicircular mating part 7b and the semicircular fixing part 7a from the mating point (i.e., "spread out"). If the locking is unreliable, it will lead to thread failure.

[0049] In order to achieve self-locking of the threaded hole 9 by rotating the handle 10, the locking mechanism of this embodiment further includes: V-groove 10a, there are two V-groove 10a, the two V-groove 10a are symmetrically arranged on both sides of one end of the handle 10; Two T-shaped wedge clamping parts 7d are symmetrically arranged on the two inner walls of the receiving groove. Each T-shaped wedge clamping part 7d is divided into two parts by the mating surfaces of the semi-circular fixing part 7a and the semi-circular mating part 7b.

[0050] The width of the receiving groove is greater than the width of the handle 10, so that the handle 10 can rotate freely within the receiving groove. During the rotation of the cylindrical sleeve 7 driven by the handle 10, the handle 10 will first rotate a small angle within the receiving groove. This relative rotation causes the corresponding groove wall of the V-shaped groove 10a on the handle 10 to engage with the corresponding inclined wall of the T-shaped wedge 7d on the inner wall of the receiving groove.

[0051] See Figure 6 This wedge-tightening fit utilizes the relative rotation angle of the handle 10 within the receiving groove to generate a radial wedge-tightening force. This wedge-tightening force tightly engages the semi-circular mating part 7b with the semi-circular fixing part 7a. The greater the applied torque, the stronger the wedge-tightening force, thereby achieving reliable self-locking of the handle 10 during rotational operation. Figure 6 Middle arrow direction Figure 5 The direction of the wedge force when the handle 10 drives the cylindrical sleeve 7 to rotate clockwise.

[0052] In the above-mentioned wedge-tightening structure, after the semicircular mating part 7b mates with the semicircular fixing part 7a, the handle 10 with the V-groove 10a needs to be inserted into the receiving through groove with the T-shaped wedge-tightening part 7d so that the handle 10 can apply force to rotate the cylindrical sleeve. Therefore, in order to facilitate the insertion and alignment of the handle 10, the T-shaped wedge-tightening part 7d forms an angled structure 7e at the intersection with the end face of the cylindrical sleeve 7. The angled structure 7e plays a guiding role. When the V-groove 10a of the handle 10 is inserted into the receiving through groove, even if the initial alignment is not completely accurate, the angled structure 7e can guide the V-groove 10a to slide smoothly into the correct position between the T-shaped wedge-tightening parts 7d, which facilitates quick assembly.

[0053] In the basic implementation, the extended bolt 12 passes through the inner hole of the buffer bushing 6, and there is a certain gap between them. When a pulling force is applied, if the axis of the extended bolt 12 deviates from that of the buffer bushing 6 (i.e., they are not aligned), the pulling force of the bolt head end on the end face of the bushing will be uneven. This eccentric torque may cause the bushing to tilt or get stuck during the pulling process, increasing the difficulty of disassembly.

[0054] To address the coaxiality issue, a rubber centering bushing can be fitted over the outside of the extended bolt 12. This elastic rubber centering bushing fills the cylindrical gap between the inner hole of the buffer bushing 6 and the extended bolt 12. This maintains the coaxiality of the extended bolt 12 and the buffer bushing 6, ensuring that the tensile force is evenly distributed on the end face of the bushing, making the disassembly process smoother.

[0055] In the above scheme, when the device is working, the open end of the cylindrical sleeve 7 (i.e., the end of the non-threaded hole 9) needs to abut against the surface of the workpiece (such as the blade holder of a bulldozer blade) with the bushing. When the cylindrical sleeve 7 is rotated with a wrench or other tools, strong sliding friction will be generated between the end face of the sleeve and the surface of the workpiece. This friction not only increases the torque required for operation, making the disassembly process more difficult, but may also cause the surface of the workpiece to be scratched.

[0056] To reduce operating friction, a planar bearing 11 can be fixedly installed at the end of the cylindrical sleeve 7 away from the threaded hole 9, that is, its open end. The planar bearing 11 and the cylindrical sleeve 7 are arranged coaxially, and the seat ring of the planar bearing 11 (i.e. the ring that contacts the tool holder surface during operation) protrudes from the end face of the cylindrical sleeve 7.

[0057] The specific assembly form of the planar bearing 11 is not limited here. For example, the planar bearing 11 can be installed and fixed by setting an internal step or an external step at the open end of the cylindrical sleeve 7. After such an arrangement, the seat ring of the planar bearing 11 contacts the workpiece during operation. When the cylindrical sleeve 7 rotates, the sleeve and the shaft ring of the planar bearing 11 (i.e. the ring fixed to the sleeve) rotate together, while the seat ring remains stationary on the surface of the workpiece. The sliding friction between the two is converted into rolling friction through the rolling elements, which significantly reduces the rotational resistance.

[0058] To ensure a more secure installation of the thrust bearing 11 and the cylindrical housing 7, and to withstand the enormous axial tensile force during disassembly, this embodiment employs a specific installation structure. For example, the thrust bearing 11 is preferably a roller bearing, as it can withstand a large axial load. A thickened portion 14 is formed at the open end of the cylindrical housing 7 (i.e., the end where the bearing is installed), and an annular groove 15 is formed on the end face of the thickened portion 14 for the mounting of the thrust bearing 11.

[0059] To further optimize the installation and positioning of the planar bearing 11, the annular groove 15 can be divided into a first annular cavity 16 and a second annular cavity 17 in its axial direction. The second annular cavity 17 is connected to the end face of the cylindrical sleeve 7. The diameter of the first annular cavity 16 is smaller than the diameter of the second annular cavity 17. The intersection between the two is smoothly transitioned by an oblique angle feature 18. The thickness (i.e., axial depth) of the first annular cavity 16 is designed to match the thickness of the shaft ring of the planar bearing 11.

[0060] During installation, the bearing ring of the planar bearing 11 (rotates with the housing) is fitted into the first annular cavity 16, while the seat ring (in contact with the workpiece) is located in the second annular cavity 17. Furthermore, the end face of the seat ring of the planar bearing 11 protrudes axially from the opening of the second annular cavity 17 (i.e., protrudes from the end face of the housing), ensuring that the seat ring contacts the workpiece first during operation.

[0061] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A synchronizing device for replacing a bulldozer blade bushing, characterized in that, The quick release device comprises: a cylindrical sleeve (7) with a cylindrical accommodating groove (8) formed inside and extending in axial direction, the axial length of the cylindrical accommodating groove (8) is less than the axial length of the cylindrical sleeve (7), the cylindrical accommodating groove (8) is open at one end face of the cylindrical sleeve (7), the other end of the cylindrical sleeve (7) is formed with a threaded hole (9) penetrating to the cylindrical accommodating groove (8), the threaded hole (9), the cylindrical accommodating groove (8) and the cylindrical sleeve (7) have the same axis, the axial length of the cylindrical accommodating groove (8) is at least greater than the axial length of one of the buffer bushings (6), the diameter of the cylindrical accommodating groove (8) is greater than the diameter of the buffer bushing (6); an elongated bolt (12), the threaded rod length of the elongated bolt (12) is not less than the total axial length of the cylindrical accommodating groove (8) and two buffer bushings (6); a limiting washer (19) sleeved outside the elongated bolt (12), the outer diameter of the limiting washer (19) is greater than the outer diameter of the buffer bushing (6); a transition washer (20) sleeved outside the elongated bolt (12), the outer diameter of the transition washer (20) is greater than the inner diameter of the buffer bushing (6) and less than the outer diameter of the buffer bushing (6); wherein the limiting washer (19) is close to the cap end of the elongated bolt (12), a replacement position is formed between the limiting washer (19) and the transition washer (20), the replacement position is used for sleeving a new buffer bushing (6) on the elongated bolt (12); in the working state of the quick release device, the threaded rod of the elongated bolt (12) is sequentially threaded into the threaded hole (9) after passing through a new buffer bushing (6), a buffer bushing (6) embedded in the tool holder (1) and the cylindrical accommodating groove (8); a screw transmission pair is formed between the cylindrical sleeve (7) and the elongated bolt (12) through the threaded hole (9), by rotating the cylindrical sleeve (7), the cap end of the bolt (12) applies an axial tension to the buffer bushing (6) to pull the old buffer bushing (6) embedded in the tool holder (1) into the cylindrical accommodating groove (8), and synchronously push the new buffer bushing (6) in the replacement position into the first through hole (1a) in the tool holder (1), the end point of the pushing of the new buffer bushing (6) is defined by the abutting of the limiting washer (19) and the outer wall of the tool holder (1).

2. A synchronizing device for replacing a blade bushing of a bulldozer according to claim 1, characterized in that the part of the cylindrical sleeve (7) with the threaded hole (9) is composed of a semicircular fixed part (7a) and a semicircular butt joint part (7b), a threaded half hole (9a) penetrating in axial direction is formed at the center of the semicircular fixed part (7a) and the semicircular butt joint part (7b), the two threaded half holes (9a) are butt jointed to form the threaded hole (9). The half-circle fixed part is a part of the cylindrical sleeve (7) body, one end of the half-circle closing part and one end of the half-circle fixed part are hinged, the half-circle closing part can rotate around the hinge to close the half-circle closing part with the half-circle fixed part to form the complete cylindrical profile of the cylindrical sleeve (7); The free end of the half-circle closing part and the non-hinged end of the half-circle fixed part are connected by a locking mechanism.

3. The synchronized doffing device for bulldozer blade bushings of claim 2, wherein, A handle (10) is connected to the outer wall of the cylindrical sleeve (7), the axial direction of the handle (10) is perpendicular to the axial direction of the cylindrical sleeve (7), one end of the handle (10) extends away from the cylindrical sleeve (7) to form a force arm for rotating the cylindrical sleeve (7).

4. The synchronized doffing device for bulldozer blade bushings of claim 3, wherein, The half-circle closing part (7b) and the half-circle fixed part (7a) are formed with a sunken groove (7c) on the outside in the axial direction, the sunken groove (7c) penetrates the half-circle closing part (7b) and the half-circle fixed part (7a) in the direction perpendicular to the axial direction of the threaded hole (9), when the half-circle closing part (7b) and the half-circle fixed part (7a) are closed, the two sunken grooves (7c) together form a receiving slot for the end of the handle (10) to be embedded, so that the handle (10) can be non-fixedly connected with the cylindrical sleeve (7).

5. The synchronized doffing device for bulldozer blade bushings of claim 4, wherein, The sunken groove (7c) is located at the free end of the half-circle closing part (7b) and the half-circle fixed part (7a), the locking mechanism comprises: Two V-shaped grooves (10a) are symmetrically arranged on both sides of one end of the handle (10); Two T-shaped wedge parts (7d) are symmetrically arranged on the inner walls of the receiving slot, each T-shaped wedge part (7d) is divided into two parts by the closing surface of the half-circle closing part (7b) and the half-circle fixed part (7a); The width of the receiving slot is greater than the width of the handle (10), so that the handle (10) can rotate freely in the receiving slot; During the rotation of the handle (10) driving the cylindrical sleeve (7), the corresponding groove wall of the V-shaped groove (10a) and the corresponding inclined wall of the T-shaped wedge part (7d) are wedge-tightened, the wedge-tightening uses the relative rotation angle of the handle (10) in the receiving slot to generate a radial wedge-tightening force, so that the half-circle closing part (7b) and the half-circle fixed part (7a) are tightly closed.

6. The synchronized doffing device for bulldozer blade bushings of claim 5, wherein, The T-shaped wedge part (7d) is formed with an inclined angle structure (7e) at the intersection with the end surface of the cylindrical sleeve (7) to guide the V-shaped groove (10a) of the handle (10) into the receiving slot.

7. The simultaneous doffing device for bulldozer blade bushings of claim 1, wherein A rubber centering bushing (13) is sleeved on the outside of the lengthened bolt (12), which is used to fill the cylindrical gap between the buffer bushing (6) and the lengthened bolt (12) to maintain the coaxiality of the lengthened bolt (12) and the buffer bushing (6).

8. The synchronized doffing device for a bulldozer blade bushing of claim 1, wherein, The cylindrical sleeve (7) is fixedly embedded with a plane bearing (11) at one end away from the threaded hole (9), the plane bearing (11) and the cylindrical sleeve (7) are coaxially arranged, and the race of the plane bearing (11) protrudes from the end face of the cylindrical sleeve (7).

9. The synchronized doffing device for bulldozer blade bushings of claim 8, wherein, The plane bearing (11) is a roller bearing, the open end of the cylindrical sleeve (7) is formed with a thickened portion (14), and the end face of the thickened portion (14) is formed with an annular recess (15) for embedding the race of the plane bearing (11).

10. The synchronized doffing device for bulldozer blade bushings of claim 9, wherein, The annular recess (15) is divided into a first annular cavity (16) and a second annular cavity (17) in the axial direction, the second annular cavity (17) is communicated with the end face of the cylindrical sleeve (7), the diameter of the first annular cavity (16) is smaller than that of the second annular cavity (17), the intersection between the two is smoothly transitioned by an inclined angle feature (18), the thickness of the first annular cavity (16) is the thickness of the race of the plane bearing (11), the race of the plane bearing (11) is located in the second annular cavity (17), and the end face of the race of the plane bearing (11) protrudes from the second annular cavity (17) in the axial direction.

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