A device for adjusting the clearance of a wet-lubricated slewing mechanism for a crane

Abstract

An adjustable clearance device for a wet-lubricated slewing mechanism of a crane belongs to the technical field of slewing mechanisms. Its features include: a gear column integrated with a turntable; a rack cylinder comprising a cylinder barrel, a piston, and a rack, the piston being placed within the cylinder barrel cavity; the end of the rack being mounted and connected to the end face of the piston via a sliding assembly, the sliding direction of the sliding assembly being perpendicular to the axis of the gear column; the rack meshing with the gear column, and when the rack cylinder operates, the piston drives the rack, which in turn drives the gear column to rotate; an adjusting assembly drives the rack to move along the sliding direction of the sliding assembly to adjust the meshing clearance between the gear column and the rack. This utility model has a simple and reasonable structure, is easy to manufacture, facilitates subsequent maintenance, allows for easy replacement of easily damaged parts, and reduces adjustment and maintenance costs.

Description

Technical Field

[0001] This utility model relates to an adjustable clearance device for a wet-lubricated slewing mechanism of a crane, belonging to the technical field of slewing mechanism. Background Technology

[0002] Forestry cranes typically rotate at about twice the speed of conventional cranes, and the rotational motion is used very frequently. This necessitates a robust lubrication system. However, wet lubrication systems often have non-adjustable clearance in the rotation mechanism. Excessive clearance can cause the crane to wobble during rotation, reducing positioning accuracy and potentially leading to accidents. Furthermore, excessive clearance accelerates wear on the rotation gears, shortening their lifespan. Conversely, insufficient clearance increases frictional resistance in the gear meshing, making the crane less flexible and potentially causing the gears to seize. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of the prior art by providing an adjustable clearance device for the wet lubrication slewing mechanism of a crane, which can adjust the meshing clearance of the slewing mechanism to avoid swaying and jamming during slewing.

[0004] The technical solution of this utility model is as follows:

[0005] An adjustable clearance device for a wet-lubricated slewing mechanism of a crane includes: a gear column, a rack cylinder, and an adjustment assembly;

[0006] The gear column is integrated with the turntable, serving as the core component of the rotary mechanism;

[0007] A rack cylinder includes a cylinder barrel, a piston, and a rack. The piston is placed inside the cylinder barrel. The end of the rack is connected to the end face of the piston via a sliding assembly. The sliding direction of the sliding assembly is perpendicular to the axis of the gear column. The rack meshes with the gear column, and when the rack cylinder operates, the piston drives the rack, which in turn drives the gear column to rotate.

[0008] The adjusting component drives the rack to move along the sliding direction of the sliding component to adjust the meshing clearance between the gear column and the rack.

[0009] The above solution integrates the gear column, rack cylinder, and adjustment assembly into a compact structure that is easy to install and maintain. The piston inside the rack cylinder moves under the action of hydraulic oil, and the movement of the piston drives the rack to move along the cylinder barrel through the sliding assembly, thereby driving the gear column and turntable to rotate. The adjustment assembly drives the rack to move along the sliding direction of the sliding assembly, thereby achieving precise adjustment of the meshing clearance between the gear column and the rack and improving the transmission accuracy.

[0010] Furthermore, the sliding assembly includes: a T-shaped slider and a T-shaped groove; the T-shaped slider is disposed in the middle of the piston end face, and slide rails are formed on both sides of the T-shaped slider; the T-shaped groove is disposed at the end of the rack and slides in cooperation with the T-shaped slider, so that the rack moves linearly along the slide rail of the T-shaped slider.

[0011] In the above scheme, after the T-shaped slider and T-shaped slide groove are connected together, the rack can be moved linearly along the sliding direction by adjusting the adjustment component, so as to realize the adjustable clearance of the wet lubrication slewing mechanism of the crane. The design of the T-shaped slider and T-shaped slide groove ensures that the adjustment direction of the rack is perpendicular to the axis of the gear column, thus ensuring the meshing accuracy between the rack and the gear column.

[0012] Furthermore, the T-shaped slider is equipped with stops at both ends in the sliding direction to limit the rack. The stops can limit the rack in the gap adjustment direction, effectively restricting the range of movement of the rack in the sliding direction, preventing excessive rack displacement from causing friction with the cylinder, and increasing stability.

[0013] Furthermore, it also includes a gear bushing; the gear bushing has a through cavity through which the cylinder passes, and the cylinder passes through the gear bushing and is sealed and fixedly connected to it; the inner wall of the gear bushing has a notch so that the gear rod can mesh with the rack for transmission. The cylinder is fixedly connected to the fixed gear bushing (connected to the base) by bolts and spring washers, and a third O-ring is provided between the cylinder and the gear bushing to effectively prevent lubricating oil leakage and keep the inside of the equipment clean and lubricated.

[0014] Furthermore, the adjusting assembly includes: an adjusting screw, an adjusting through hole, and a locking nut; the outer surface of the adjusting screw is provided with an external thread step, a smooth column, an annular groove, a threaded rod, and an internal hexagon bolt head from top to bottom; the adjusting through hole is located on the outer cavity wall of the gear bushing, and its hole wall is provided with a large-diameter internal thread surface, a small-diameter smooth surface, and an annular groove from the inside to the outside; the external thread step of the adjusting screw is threadedly connected to the internal thread surface, and the internal hexagon bolt head extends out of the adjusting through hole; the locking nut is located outside the adjusting through hole and is threadedly connected to the threaded rod of the adjusting screw.

[0015] The above solution allows for gap adjustment by moving the rack along the sliding direction through adjusting the screw. Specifically:

[0016] If the meshing clearance is too large: loosen the lock nut outwards, then turn the adjusting screw inwards to drive the rack to move in the sliding direction, reducing the meshing clearance between the gear column and the rack. After adjustment, tighten the lock nut.

[0017] If the meshing clearance is too small: turn the adjusting screw outward. During the meshing transmission between the rack and the gear column, the meshing clearance will be adjusted adaptively. After the adjustment is completed, tighten the locking nut.

[0018] The external thread step mates with the large-diameter internal thread surface, and a limiting design is implemented. After adjustment to a certain extent, the adjustment is restricted to prevent the adjusting screw from falling off and leaking oil.

[0019] Furthermore, a first O-ring and a second O-ring are respectively provided in the annular groove and annular channel for sealing and preventing oil leakage. The two O-rings are interchangeable for sealing: when replacing the first O-ring on the adjusting screw, the second O-ring can cooperate with the smooth surface of the adjusting screw to seal and prevent oil leakage; when replacing the second O-ring, the first O-ring can cooperate with the smooth surface of the small diameter of the adjusting through hole to seal and prevent oil leakage.

[0020] Furthermore, a support slider is provided between the back of the rack and the cavity wall of the gear bushing, which can effectively support the rack, reduce direct friction between the rack and the gear bushing, reduce wear, and make the rack rotate more smoothly.

[0021] Furthermore, the support slider has an embedded shim located at the adjustment through hole. When the adjustment screw is tightened to adjust the clearance, the shim acts to disperse stress concentration and prevent the support slider from cracking due to stress concentration.

[0022] This utility model has a simple and reasonable structure, is easy to manufacture, facilitates subsequent maintenance, makes it easy to replace vulnerable parts, and reduces adjustment and maintenance costs. The specific benefits are as follows:

[0023] 1) The design of the sliding component enables adjustable clearance of the wet-lubricated slewing mechanism of the crane;

[0024] 2) The design of the stop block limits the sliding direction of the rack in the gap adjustment, thereby improving the stability, reliability and service life of the component;

[0025] 3) The design of the first and second O-rings not only serves to seal the adjustment components, but also ensures that there is no oil leakage when the wet lubrication system is maintained and the wear parts (O-rings) are replaced. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the piston structure in this utility model;

[0028] Figure 3 This is an enlarged view of the end of the rack in this utility model;

[0029] Figure 4 This is a schematic diagram showing the connection between the rack and the piston in this utility model;

[0030] Figure 5This is a schematic diagram of the adjusting screw in this utility model;

[0031] Figure 6 This is a schematic diagram of the adjusting through hole in this utility model;

[0032] Figure 7 for Figure 1 Enlarged view of a portion of the image;

[0033] Figure 8 for Figure 7 Enlarged view of a portion of the image;

[0034] In the diagram: Cylinder 1; Piston 2, T-slider 2-1, slide rail 2-2, mounting groove 2-3; Gear bushing 3, adjusting through hole 3-1, internal thread surface 3-1-1, smooth surface 3-1-2, annular groove 3-1-3; Gear column 4; Rack 5, T-slider groove 5-1, tooth 5-2; Bolt 6; Spring washer 7; Bolt 8; Stop block 9; Support slider 10; Pad 11; Adjusting screw 12, external thread step 12-1, smooth column 12-2, annular groove 12-3, threaded rod 12-4, internal hex bolt head 12-5; Locking nut 13; First O-ring 14; Second O-ring 15; Third O-ring 16. Detailed Implementation

[0035] An adjustable clearance device for a wet-lubricated slewing mechanism of a crane, such as... Figure 1 As shown, it includes: a gear bushing 3, a gear column 4 (integrated with the turntable), a rack cylinder, a sliding assembly, and an adjusting assembly; the rack cylinder includes a cylinder barrel 1, a piston 2, and a rack 5. The piston 2 and the rack 5 are installed inside the cylinder barrel 1, and the end of the rack is connected to the end face of the piston 2 through the sliding assembly. The gear column 4 and the rack 5 mesh.

[0036] The gear bushing 3 is fixedly connected to the base of the rotary mechanism, such as... Figure 1 As shown, the gear bushing 3 has a through cavity through which the cylinder passes. The cylinder passes through the cavity of the gear bushing and is fixed to the gear bushing 3 by bolts 6 and spring washers 7. A third O-ring 16 is provided between the cylinder and the gear bushing. The inner wall of the gear bushing has a notch so that the gear rod can mesh with the rack for transmission.

[0037] The sliding direction of the sliding component is perpendicular to the axis of the gear column, such as... Figure 2 , Figure 3 , Figure 4 As shown, the sliding assembly includes a T-shaped slider 2-1 and a T-shaped groove 5-1. The T-shaped slider 2-1 is located at the center of the piston 2 end face, and slide rails 2-2 are formed on both sides of the T-shaped slider. The T-shaped groove 5-1 is located at the end of the rack and slides in cooperation with the T-shaped slider. The meshing clearance between the gear column and the rack is adjusted by driving the rack to move along the sliding direction of the sliding assembly through the adjusting assembly.

[0038] In one embodiment of this utility model, such as Figure 2 As shown, the T-shaped slider 2-1 has two mounting grooves 2-3 for mounting the stop block 9. Figure 1 As shown, the stop block 9 is fixed to the piston 2 by bolt 8, which can limit the rack 5 in the sliding direction and prevent excessive displacement.

[0039] The adjusting assembly includes: adjusting screw 12, adjusting through hole 3-1, and locking nut 13. For example... Figure 5 As shown, the outer surface of the adjusting screw is provided with, from top to bottom, an external threaded step 12-1, a smooth post 12-2, an annular groove 12-3, a threaded rod 12-4, and an internal hexagonal bolt head 12-5. (See diagram below.) Figure 6 As shown, the adjusting through hole 3-1 is located on the outer cavity wall of the gear bushing, and its hole wall is provided with a large-diameter internal thread surface 3-1-1, a small-diameter smooth surface 3-1-2, and an annular groove 3-1-3 in sequence from the inside to the outside.

[0040] like Figure 7 , Figure 8 As shown, the external thread step of the adjusting screw is threadedly connected to the internal thread surface, and the head of the internal hexagonal bolt extends out of the adjusting through hole; the lock nut is located outside the adjusting through hole and is threadedly connected to the threaded rod of the adjusting screw. A first O-ring 14 and a second O-ring 15 are respectively installed in the annular groove and annular trench for sealing.

[0041] In one embodiment of this utility model, the rack has teeth 5-2 on the front side and a support slider 10 is provided between the back side of the rack and the cavity wall of the gear bushing. A shim 11 is embedded in the support slider and is located at the adjustment through hole.

[0042] In use, by rotating the adjusting screw 12, the adjusting screw 12 pushes the shim 11 and the support slider 10. Then, the support slider 10 drives the rack 5 to move along the slide rail 2-2, so that the meshing gap between the rack 5 and the gear column 4 becomes smaller.

Claims

1. A clearance adjustable device for a wet-lubricated slewing mechanism of a crane, characterized in that it comprises: The gear column is integrated with the turntable; A rack cylinder includes a cylinder barrel, a piston, and a rack, wherein the piston is placed inside the cylinder barrel. The end of the rack is mounted and connected to the end face of the piston via a sliding assembly, the sliding direction of which is perpendicular to the axis of the gear column; the rack meshes with the gear column, the rack cylinder works, and the piston drives the rack, which in turn drives the gear column to rotate. A gear bushing, wherein the gear bushing has a through cavity through which a cylinder passes, the cylinder passes through the gear bushing and is sealed and fixedly connected to it; the inner cavity wall of the gear bushing has a notch so that the gear column can mesh with the rack for transmission. An adjusting component drives the rack to move along the sliding direction of the sliding component to adjust the meshing clearance between the gear post and the rack; the adjusting component includes: The adjusting screw has, from top to bottom, an external threaded step, a smooth column, an annular groove, a threaded rod, and an internal hexagonal bolt head on its outer circular surface. An adjustment through hole is provided on the outer cavity wall of the gear bushing. The hole wall is provided with a large-diameter internal thread surface, a small-diameter smooth surface, and an annular groove from the inside to the outside. The external thread step of the adjustment screw is threadedly connected to the internal thread surface, and the head of the internal hexagon bolt extends out of the adjustment through hole. The lock nut is located outside the adjusting through hole and is threadedly connected to the threaded rod of the adjusting screw.

2. The wet-lubricated slewing mechanism gap-adjusting device of claim 1, wherein The sliding component includes: The T-shaped slider is located in the middle of the piston end face, and slide rails are formed on both sides of the T-shaped slider; The T-shaped groove is located at the end of the rack and slides in conjunction with the T-shaped slider, allowing the rack to move linearly along the slide rail of the T-shaped slider.

3. The adjustable clearance device for a wet-lubricated slewing mechanism of a crane according to claim 2, characterized in that, The T-shaped slider has stops at both ends in the sliding direction to limit the rack.

4. The adjustable clearance device for a wet-lubricated slewing mechanism of a crane according to claim 1, characterized in that, The annular groove and the annular channel are respectively provided with a first O-ring and a second O-ring.

5. The adjustable clearance device for a wet-lubricated slewing mechanism of a crane according to claim 1 or 4, characterized in that, A support slider is provided between the back of the rack and the cavity wall of the gear bushing.

6. The adjustable clearance device for a wet-lubricated slewing mechanism of a crane according to claim 5, characterized in that, The support slider has a shim embedded in it, and the shim is located at the adjustment through hole.

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