A quick release device for a bulldozer blade bushing

Abstract

The utility model discloses a kind of bushing quick release devices of bulldozer spade, the device mainly includes cylindrical sleeve shell and lengthening bolt, cylindrical sleeve shell is formed with the cylindrical accommodating slot extending along axial direction inside, accommodating slot axial length is less than sleeve shell length, and open in sleeve shell one end end face, for accommodating bushing being pulled out, sleeve shell other end is formed with the threaded hole through accommodating slot, accommodating slot, threaded hole and sleeve shell three axial coincidences, the length of lengthening bolt threaded rod is enough to pass through bushing and accommodating slot, when working condition, lengthening bolt is screwed into threaded hole after passing through bushing, screw transmission pair is formed between sleeve shell and bolt, by rotating sleeve shell, screw cap end applies axial tension to bushing, and bushing is pulled into accommodating slot. The utility model is simple in structure, convenient to operate, and can efficiently disassemble difficult-to-grab interference bushing.

Description

Technical Field

[0001] This utility model relates to the field of bushing tools, specifically to a quick-release device for the bushing of a bulldozer blade. Background Technology

[0002] During long-term, high-intensity operation, the buffer bushings (sleeves) used in the critical connection parts of large construction machinery such as bulldozer blades need to be replaced periodically due to wear. The bushings are usually embedded in the metal holes with an interference fit to ensure the strength and reliability of the connection.

[0003] Due to this interference fit, bushing removal becomes a time-consuming and challenging maintenance task. In the prior art, a common tool for removing interference-fit components is a puller (commonly known as a puller).

[0004] Traditional puller tools mainly use multiple claw arms to hook the outer edge of the part to be disassembled, and then use a central helical push rod to generate axial thrust to pull the part off the shaft.

[0005] However, when the bushing is fitted into the hole of a flat plate or thick metal plate, its outer edge is often difficult to be effectively gripped by the puller's claw arm. Furthermore, the traditional puller design is for disassembling components on the shaft and is not suitable for the specific working conditions inside such a flat plate hole.

[0006] Therefore, there is an urgent need for a quick-release device with a simple structure and efficient operation, which can specifically solve the problem of on-site disassembly of interference bushings. Utility Model Content

[0007] The purpose of this utility model is to provide a quick-release device for the bushing of a bulldozer blade, so as to solve the problem that traditional puller tools in the prior art are difficult to effectively disassemble the bushing embedded in the flat plate hole and lack the interference fit to grip the outer edge.

[0008] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution: A quick-release device for the bushing of a bulldozer blade 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, and 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 coincide. 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 buffer bushing. The diameter of the cap end of the extended bolt shall be less than the outer diameter of the buffer bushing and greater than the inner diameter of the buffer bushing. The axial length of the cylindrical receiving groove is at least greater than the axial length of one buffer bushing, and the diameter of the cylindrical receiving groove is greater than the diameter of the buffer bushing. When the quick-release device is in operation, the threaded rod of the extended bolt passes through the buffer bushing and the cylindrical receiving groove in sequence and is screwed into the threaded hole. The cylindrical sleeve and the extended bolt form a helical transmission 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 to pull the buffer bushing into the cylindrical receiving groove.

[0009] Preferably, 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.

[0010] Preferably, a radial mounting hole is provided on the side wall of the cylindrical sleeve away from the plane bearing. A handle is screwed into the radial mounting hole. One end of the handle is fixedly connected to the radial mounting hole by a thread, and the other end extends outward to form a lever arm for rotating the cylindrical sleeve.

[0011] Preferably, the planar bearing is a roller bearing, and a thickened portion is formed at the open end of the cylindrical housing. An annular groove for fitting the shaft ring of the planar bearing is formed on the end face of the thickened portion.

[0012] Preferably, 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.

[0013] Preferably, a rubber centering bushing is fitted on the outer side of the extension bolt. The rubber centering bushing is used to fill the cylindrical gap between the buffer bushing and the extension bolt to maintain the coaxiality of the extension bolt and the buffer bushing.

[0014] Preferably, a thickened washer is fitted on the outer side of the extended bolt, the outer diameter of the thickened washer being smaller than the outer diameter of the buffer bushing and larger than the inner diameter of the buffer bushing; When the quick-release device is in operation, the cap end of the thickened gasket, through the extended bolt, presses against the end of the buffer bushing away from the cylindrical sleeve.

[0015] Preferably, the thickened pad is an anti-slip pad.

[0016] The beneficial effects of this utility model are: This invention utilizes the principle of threaded transmission. By using an extended bolt and a cylindrical sleeve, the buffer bushing can be disassembled by pulling out of the interference fit or installed by pulling in. The device has a simple structure, is easy to operate, and significantly shortens maintenance time. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model 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 in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is an exploded perspective view of the shovel assembly according to an embodiment of the present utility model. Figure 2 This is a planar sectional view of the buffer bushing connection of the shovel assembly according to an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the quick-release device according to an embodiment of the present utility model; Figure 4 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; 8-cylindrical receiving groove; 9-threaded hole; 10-handle; 11-plane bearing; 12-extended bolt; 13-rubber centering bushing; 14-thickened part; 15-annular groove; 16-first annular cavity; 17-second annular cavity; 18-angled feature; 19-thickened washer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In order to overcome the maintenance difficulties caused by welding to fix the blade plate in the existing technology and the problem that the blade assembly is prone to cracking due to thermal cycling, this utility model first provides a bulldozer blade assembly with replaceable blade plates.

[0021] Specifically, refer to Figure 1 and Figure 2As shown, the assembly includes a tool holder 1, several tool plates 2, and several sets of connecting components. Several sets of first through holes 1a are formed along the lower edge of the tool holder 1, with each set containing the same number of first through holes 1a and evenly spaced. Each tool plate 2 corresponds to a set of first through holes 1a along the lower edge of the tool holder 1. Several second through holes 2a are formed on the tool plate 2, aligned with the corresponding first through holes 1a. The diameter of the second through holes 2a is smaller than the diameter of the first through holes 1a. The number of connecting components matches the number of tool plates 2, and each set of connecting components is used to fix one tool plate 2 to the tool holder 1.

[0022] The connecting assembly includes several buffer connectors, the number of which corresponds to the number of first through holes 1a in each group. Each buffer connector includes: a buffer bushing 6, a bolt 3, a washer 4, and a nut 5.

[0023] The buffer bushing 6 is disposed in the corresponding first through hole 1a. The threaded rod of the bolt 3 passes through the second through hole 2a and the buffer bushing 6 in sequence. The washer 4 is sleeved on the end of the bolt 3 that protrudes from the first through hole 1a. The nut 5 is tightened on the end of the bolt 3 that protrudes from the first through hole 1a. The washer 4 is located between the nut 5 and the outer wall of the tool holder 1.

[0024] With the above structure, when the bulldozer blade falls rapidly and violently impacts the rock, the huge impact force borne by the blade plate 2 will be transmitted through the bolt 3. Since the buffer bushing 6 is set inside the first through hole 1a of the blade holder 1, and the bolt 3 passes through the buffer bushing 6, the impact force is mainly borne by the buffer bushing 6 and transmitted to the blade holder 1 by the buffer bushing 6.

[0025] This design avoids the impact force acting directly on the first through hole 1a on the tool holder 1, effectively preventing the first through hole 1a from becoming elliptical or out of round due to repeated huge impact forces.

[0026] Meanwhile, the buffer bushing 6 is a replaceable component. When it wears or is damaged due to impact, only the buffer bushing 6 needs to be replaced, without the need to repair or replace the expensive tool holder 1, thus reducing maintenance costs.

[0027] Furthermore, compared to traditional welding methods, this design of fixing the blade plate 2 with bolted connection components eliminates the need for cutting and re-welding when the blade plate 2 needs to be replaced later. Only the nut 5 and bolt 3 need to be removed, which greatly reduces the workload and time of maintenance.

[0028] In the above scheme, if a clearance fit or transition fit is adopted between the buffer bushing 6 and the first through hole 1a, the buffer bushing 6 itself may also undergo relative displacement or loosening within the first through hole 1a under long-term strong impact and vibration. This loosening will weaken its buffering effect and may in turn aggravate the wear of the first through hole 1a.

[0029] Therefore, as an improvement, the buffer bushing 6 and the first through hole 1a are fitted with an interference fit. Through the interference fit, the buffer bushing 6 is firmly pressed into the first through hole 1a, so that the two are tightly connected, like a whole.

[0030] This ensures that even under severe impact, the cushioning bushing 6 remains stable and does not shift relative to the ground, thus guaranteeing the stability of impact force transmission and the durability of the cushioning effect.

[0031] Furthermore, to ensure that the buffer bushing 6 can provide stable and uniform support, its axial length needs to be considered. If the axial length of the buffer bushing 6 is shorter than the length of the first through hole 1a, there will be a gap in the axial direction (i.e., the direction through which the bolt 3 passes), resulting in unstable support. If the buffer bushing 6 is too long, it will protrude from the outer wall of the tool holder 1, affecting the installation and tightening of the gasket 4 and the nut 5.

[0032] Therefore, in a preferred embodiment, the axial length of the buffer bushing 6 is consistent with the length of the first through hole 1a, and the two ends of the buffer bushing 6 are flush with the outer walls of both sides of the tool holder 1.

[0033] This design allows the buffer bushing 6 to completely fill the first through hole 1a, providing a reliable support surface in both the axial and radial directions, ensuring that the connecting components are subjected to uniform force during tightening, and improving the stability of impact load transmission.

[0034] Although the above structure solves the problem of deformation of the hole in the cutter holder 1 through the buffer bushing 6, the vibration generated by the bulldozer during operation is continuous and extremely violent under extreme working conditions such as metal mines. Relying solely on the conventional tightening of bolts 3 and nuts 5 is still insufficient to completely prevent the nuts 5 from loosening due to violent vibration. Once the nuts 5 loosen, the entire connection will fail, and there is a risk that the cutter plate 2 will fall off.

[0035] Meanwhile, the impact force transmitted to the other end of bolt 3 also needs to be further absorbed. To this end, this solution is further improved. Nut 5 is a lock nut, such as a nylon lock nut or a high-strength lock nut, and washer 4 is an elastic shock-absorbing washer, such as a polyurethane washer or a high-strength disc spring washer.

[0036] The anti-loosening nut 5 provides additional friction or mechanical locking force to effectively resist vibration and prevent the nut 5 from automatically loosening during operation. The elastic damping washer 4 (such as polyurethane or disc spring) provides a second buffer between the nut 5 and the tool holder 1. It can absorb and dissipate some of the high-frequency vibration and impact energy transmitted from the bolt 3, further protecting the reliability of the threaded connection. It also works in synergy with the buffer bushing 6 to jointly improve the impact resistance and connection stability of the entire assembly.

[0037] In the above scheme, the buffer bushing 6 is the core component that withstands impact and wear. It needs to have sufficient strength and toughness to resist impact forces without breaking, while also dealing with friction from rocks and gravel in the mining environment and potential corrosion problems.

[0038] If the material of the buffer bushing 6 is not properly selected, or the surface treatment is insufficient, it may lead to premature failure or wear, increasing the replacement frequency. Considering the requirements for mechanical performance and durability, the buffer bushing 6 is made of 45# steel. In addition, the surface of the buffer bushing 6 is coated with a wear-resistant and corrosion-resistant coating, such as chrome plating, carburizing, or thermal spraying.

[0039] 45# steel, as a medium-carbon quenched and tempered steel, has good comprehensive mechanical properties, including good strength, toughness and certain wear resistance. It is suitable as a component that bears impact loads. Adding a wear-resistant and corrosion-resistant coating (such as a chromium plating layer or a carburized layer) to its surface can significantly improve the surface hardness and wear resistance of the buffer bushing 6 to resist friction and wear under harsh working conditions. At the same time, the coating can also play a role in rust prevention and corrosion resistance, extending the service life of the buffer bushing 6, thereby also extending the maintenance cycle of the entire blade assembly.

[0040] Based on this blade assembly, in order to facilitate the on-site disassembly and replacement of the buffer bushing 6, a set of disassembly tools that can operate quickly and efficiently are also needed. This tool will allow for easy removal and replacement of the buffer bushing 6 from the blade holder 1 when it needs to be replaced.

[0041] Specifically, this application further provides a quick-release device for the bushing of a bulldozer blade, which aims to solve the problem that the buffer bushing 6 in the aforementioned blade assembly is difficult to quickly disassemble and replace on the job site.

[0042] Reference Figure 3 and Figure 4 The device includes a cylindrical sleeve 7 and an extended bolt 12. The cylindrical sleeve 7 has an axially extending cylindrical receiving groove 8 formed inside, the axial length of which is less than the axial length of the cylindrical sleeve 7, and the cylindrical receiving groove 8 opens at one end face of the cylindrical sleeve 7. The other end of the cylindrical sleeve 7 has a threaded hole 9 extending into the cylindrical receiving groove 8, and the axes of the threaded hole 9, the cylindrical receiving groove 8, and the cylindrical sleeve 7 coincide.

[0043] The thread length of the extended bolt 12 is not less than the total axial length of the cylindrical receiving groove 8 and the buffer bushing 6 to ensure sufficient stroke to pull out the bushing. The diameter of the head end of the extended bolt 12 is smaller than the outer diameter of the buffer bushing 6 and larger than the inner diameter of the buffer bushing 6, so that when the bushing is pulled, the bolt head end can abut against the end face of the bushing without being stuck by the working hole where the bushing is located.

[0044] In order to accommodate the disassembled bushing, the axial length of the cylindrical receiving groove 8 is at least greater than the axial length of one buffer bushing 6, and the diameter of the cylindrical receiving groove 8 is greater than the diameter of the buffer bushing 6.

[0045] When the quick-release device is in operation, the threaded rod of the extended bolt 12 passes through the buffer bushing 6 to be disassembled and the cylindrical receiving groove 8 in sequence, and then screws into the threaded hole 9.

[0046] At this time, a helical transmission 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 bolt 12 cap will apply a huge axial tensile force to the buffer bushing 6 using the principle of labor saving of helical transmission, thereby pulling the buffer bushing 6 out of its interference fit hole and finally pulling it into the cylindrical receiving groove 8 to complete the disassembly. The installation of a new buffer bushing 6 is the same.

[0047] In the above scheme, the cylindrical sleeve 7 needs to be rotated to generate tension. If the outer surface of the cylindrical sleeve 7 is smooth, it will be very difficult to apply torque manually. To facilitate the application of force, the outer wall of the cylindrical sleeve 7 can be formed with a hexagonal surface structure, so that sufficient torque can be applied to it using standard tools such as wrenches.

[0048] 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 1 of a bulldozer blade) with the bushing. When the cylindrical sleeve 7 is rotated using tools such as wrenches, 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.

[0049] 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 surface of the tool holder 1 during operation) protrudes from the end face of the cylindrical sleeve 7.

[0050] 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 7 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] To address the coaxiality issue, a rubber centering bushing 13 can be fitted over the outside of the extended bolt 12. The rubber centering bushing 13 is elastic and 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.

[0056] In the basic implementation, although the diameter of the cap of the extended bolt 12 is specified to be larger than the inner diameter of the buffer bushing 6, in practical applications, the inner diameter of the buffer bushing 6 is usually larger. Since the extended bolt 12 is a standard part, its cap diameter is standard. This may result in a small contact area between the cap and the bushing's inner diameter, even though the dimensions meet the requirements, making it difficult to accommodate bushings of all sizes. Furthermore, when tensile force is applied, this small contact area leads to excessive pressure, making it difficult to achieve uniform distribution of axial tensile force and easily causing stress concentration.

[0057] To this end, a thickened washer 19 can be fitted on the outside of the extended bolt 12. The outer diameter of the thickened washer 19 is smaller than the outer diameter of the buffer bushing 6 (to ensure that the washer will not be stuck by the workpiece hole) and larger than the inner diameter of the buffer bushing 6 (to ensure that it can abut against the end face of the bushing).

[0058] When the quick-release device is in operation, the thickened shim 19 is pressed against the end of the buffer bushing 6 away from the cylindrical sleeve 7 by the cap end of the extended bolt 12. In this way, the tension of the bolt is transmitted to the buffer bushing 6 through the thickened shim 19 with a larger area, which disperses the force and makes the force more even. At the same time, it also improves the compatibility of the device with bushings of different inner diameters.

[0059] Furthermore, if a common thickened metal gasket 19 is used, under enormous tensile force, relative slippage may occur between the gasket and the bushing end face, reducing the drawing efficiency.

[0060] To enhance contact reliability, the thickened gasket 19 can be made of an anti-slip material, preferably a composite material. While a metal gasket with anti-slip teeth on both sides provides good anti-slip properties, it may leave indentations on the end face of the bushing.

[0061] These indentations can become stress concentration points, and if the bushing is subjected to frequent stress conditions in the future, stress fracture may occur at the indentations. Using composite material anti-slip pads can provide sufficient friction while avoiding damage to the bushing end face.

[0062] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of this utility model.

Claims

1. A quick-release device for the bushing of a bulldozer blade, characterized in that, include: Buffer bushing (6); A cylindrical sleeve (7) has a cylindrical receiving groove (8) extending in the axial direction inside it. 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) and extends through the cylindrical receiving groove (8). The axes of the threaded hole (9), the cylindrical receiving groove (8), and the cylindrical sleeve (7) coincide. 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 buffer bushing (6), and the diameter of the cap end of the extended bolt (12) is less than the outer diameter of the buffer bushing (6) and greater than the inner diameter of the buffer bushing (6). Wherein, the axial length of the cylindrical receiving groove (8) is at least greater than the axial length of one of the buffer bushings (6), and the diameter of the cylindrical receiving groove (8) is greater than the diameter of the buffer bushing (6); When the quick-release device is in operation, the threaded rod of the extended bolt (12) passes through the buffer bushing (6) and the cylindrical receiving groove (8) in sequence and then screws into the threaded hole (9). The cylindrical sleeve (7) and the extended bolt (12) form a helical transmission pair through the threaded hole (9). By rotating the cylindrical sleeve (7), the cap end of the bolt (12) applies an axial tensile force to the buffer bushing (6) to pull the buffer bushing (6) into the cylindrical receiving groove (8).

2. The quick-release device for the bushing of a bulldozer blade according to claim 1, characterized in that, A planar bearing (11) is fixedly installed at one end of the cylindrical sleeve (7) away from the threaded hole (9). The planar bearing (11) and the cylindrical sleeve (7) are arranged coaxially, and the seat ring of the planar bearing (11) protrudes from the end face of the cylindrical sleeve (7).

3. The quick-release device for the bushing of a bulldozer blade according to claim 2, characterized in that, A radial mounting hole is provided on the side wall of the cylindrical sleeve (7) away from the plane bearing (11). A handle (10) is screwed into the radial mounting hole. One end of the handle (10) is fixedly connected to the radial mounting hole by a thread, and the other end extends outward to form a lever arm for rotating the cylindrical sleeve (7).

4. A quick-release device for the bushing of a bulldozer blade according to claim 2, characterized in that, The planar bearing (11) is a roller bearing, and a thickened portion (14) is formed at the open end of the cylindrical housing (7). An annular groove (15) for the shaft ring of the planar bearing (11) to be fitted is formed on the end face of the thickened portion (14).

5. A quick-release device for the bushing of a bulldozer blade according to claim 4, characterized in that, The annular groove (15) is 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 junction between the two is smoothly transitioned by an oblique angle feature (18). The thickness of the first annular cavity (16) is the thickness of the shaft ring of the planar bearing (11). The seat ring of the planar bearing (11) is located in the second annular cavity (17), and the end face of the seat ring of the planar bearing (11) protrudes axially from the second annular cavity (17).

6. A quick-release device for the bushing of a bulldozer blade according to claim 1, characterized in that, The extended bolt (12) is fitted with a rubber centering bushing (13) on its outer side. The rubber centering bushing (13) is used to fill the cylindrical gap between the buffer bushing (6) and the extended bolt (12) to maintain the coaxiality of the extended bolt (12) and the buffer bushing (6).

7. A quick-release device for the bushing of a bulldozer blade according to claim 1, characterized in that, A thickened washer (19) is fitted on the outer side of the extended bolt (12). The outer diameter of the thickened washer (19) is smaller than the outer diameter of the buffer bushing (6) and larger than the inner diameter of the buffer bushing (6). When the quick-release device is in operation, the cap end of the thickened gasket (19) through the extended bolt (12) abuts against the end of the buffer bushing (6) away from the cylindrical sleeve (7).

8. A quick-release device for the bushing of a bulldozer blade according to claim 7, characterized in that, The thickened pad (19) is an anti-slip pad.

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