Damping device of large excavator

Abstract

The invention discloses a damping device of a large excavator, and relates to the technical field of excavator parts. The buffering device comprises a buffering rubber sleeve fixedly sleeved in a rotating shaft hole of the mechanical arm; the buffering rubber sleeve is provided with a supporting assembly used for being connected with a mechanical arm rotating shaft. A plurality of buffering cavities are distributed in the buffering rubber sleeve in the axial direction. The adjacent buffer cavities are mutually staggered in the radial direction; the supporting assembly comprises a plurality of limiting lantern rings which are sequentially and concentrically connected to the inner side of the buffering rubber sleeve in a sleeving mode. The adjacent limiting lantern rings are in sliding connection with each other; the adjacent limiting lantern rings are provided with anti-disengaging pieces used for preventing the limiting lantern rings from disengaging. The limiting lantern ring on the outermost side is fixedly connected with the buffering rubber sleeve. One end of the limiting lantern ring on the outermost side extends out of the inner side of the buffering rubber sleeve and is connected with the mechanical arm through a strengthening buffering mechanism. The buffering and damping device has the beneficial effects that the buffering and damping effect on the rotating shaft position of the mechanical arm can be achieved, the adaptability to the installed rotating shaft is high, and the buffering and damping effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of excavator parts, and particularly to a shock absorption device for a large excavator. Background Art

[0002] Due to the working nature of large excavators, impact loads are frequently generated, resulting in large vibrations and impacts. If not controlled, these vibrations will not only affect the stability of the machine, significantly shorten the service life of the excavator, but also cause discomfort and safety hazards to the operators. Therefore, the buffer structure design of the large excavator platform is crucial, which can effectively absorb various vibration impacts and improve the stability and safety of the operation.

[0003] The current shock absorption device buffers between the cab and the frame, as well as at the walking system of the excavator. However, there is usually a lack of buffering at the rotating shaft position of the articulated boom, and it relies only on the strength of the boom and the articulated rotating shaft itself to bear. Once the vibration is severe, it is easy to cause damage to the rotating shaft and the boom, resulting in failures. Summary of the Invention

[0004] The technical problem to be solved by the present invention is, in view of the above-mentioned technical deficiencies, to provide a shock absorption device for a large excavator, which can play a role in buffering and shock absorption for the rotating shaft position of the boom, has strong adaptability to the installed rotating shaft, and has good buffering and shock absorption effects.

[0005] The technical solution adopted by the present invention is: to provide a shock absorption device for a large excavator, including a buffer rubber sleeve sleeved and fixed in the rotating shaft hole of the boom; a support assembly for connecting with the rotating shaft of the boom is provided on the buffer rubber sleeve;

[0006] A plurality of buffer cavities are axially distributed inside the buffer rubber sleeve; adjacent buffer cavities are staggered with each other in the radial direction;

[0007] The support assembly includes a plurality of limiting rings concentrically sleeved inside the buffer rubber sleeve in sequence; adjacent limiting rings are slidably connected to each other; anti-disengagement parts for preventing the limiting rings from disengaging are provided on adjacent limiting rings; the outermost limiting ring is fixedly connected to the buffer rubber sleeve; one end of the outermost limiting ring extends out from the inside of the buffer rubber sleeve and is connected to the boom through a strengthening buffer mechanism.

[0008] Further optimizing the technical solution, an anti-disengagement part of a shock absorption device for a large excavator includes a groove opened in the inner wall of the outer limiting ring along the normal direction, and a slider fixed on the outer wall of the inner limiting ring; the slider is slidably connected corresponding to the groove.

[0009] To further optimize this technical solution, a strengthening buffer mechanism of a shock absorption device for a large excavator includes a positioning frame coaxially fixed at the end of a buffer rubber sleeve; a plurality of shock absorption springs are evenly distributed along the circumferential direction outside the outermost limiting collar; one end of each shock absorption spring is connected to the outer wall of the outermost limiting collar, and the other end is connected to the positioning frame.

[0010] To further optimize this technical solution, a limiting mechanism for blocking the movement of the limiting collar towards the side of the positioning frame is provided on the positioning frame of a shock absorption device for a large excavator; the limiting mechanism includes a through hole opened on the protruding end of the outermost limiting collar; a sliding sleeve is fixed on the positioning frame; the sliding sleeve and the through hole are distributed along the radial direction of the limiting collar; a blocking block is slidably connected inside the sliding sleeve; one end of the blocking block passes through the through hole, and the other end is rotatably connected to an adjusting bolt; the adjusting bolt is arranged in the same direction as the blocking block and is threadedly connected to the positioning frame.

[0011] The beneficial effects of the present invention are as follows:

[0012] The buffer rubber sleeve can separate the rotating shaft from the robotic arm, so that the impact generated between the rotating shaft and the robotic arm is absorbed by the buffer rubber sleeve, thereby effectively buffering and reducing shock. A plurality of buffer cavities are distributed along the axial direction inside the buffer rubber sleeve. The arrangement of the buffer cavities is beneficial to the recovery of the buffer rubber sleeve after being deformed by impact, effectively improving the deformation amplitude that the buffer rubber sleeve can withstand. The adjacent buffer cavities are staggered with each other in the radial direction. On the premise of ensuring strong recovery performance of the buffer rubber sleeve after deformation, sufficient supporting force at the rotating shaft is also ensured.

[0013] The arrangement of multiple limiting collars can adapt to the installation of rotating shafts with different diameters, and the vibration buffering effect at the rotating shaft is further improved through the strengthening buffer mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic exploded view of the present invention;

[0015] Figure 2 is a schematic axial cross-sectional view of the buffer rubber sleeve;

[0016] Figure 3 is a schematic radial cross-sectional view of the buffer rubber sleeve;

[0017] Figure 4 is a schematic structural view of the strengthening buffer mechanism and the limiting mechanism.

[0018] In the figures, 1, buffer rubber sleeve; 2, buffer cavity; 3, limiting collar; 4, groove; 5, slider; 6, positioning frame; 7, shock absorption spring; 8, through hole; 9, sliding sleeve; 10, blocking block; 11, adjusting bolt. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] As shown Figure 1 in the figure, a shock-absorbing device for a large excavator includes a buffer rubber sleeve 1 sleeved and fixed in the rotating shaft hole of the robotic arm; a support assembly for connecting with the rotating shaft of the robotic arm is arranged on the buffer rubber sleeve 1;

[0021] As shown Figures 2-3 in the figure, a plurality of buffer cavities 2 are axially distributed inside the buffer rubber sleeve 1; adjacent buffer cavities 2 are staggered with each other in the radial direction;

[0022] As shown Figure 1 and Figure 4 in the figure, the support assembly includes a plurality of limiting collar rings 3 concentrically sleeved inside the buffer rubber sleeve 1 in sequence; adjacent limiting collar rings 3 are slidably connected with each other; anti-disengagement parts for preventing the limiting collar rings 3 from disengaging are arranged on adjacent limiting collar rings 3; the outermost limiting collar ring 3 is fixedly connected with the buffer rubber sleeve 1; one end of the outermost limiting collar ring 3 extends out from the inside of the buffer rubber sleeve 1 and is connected with the robotic arm through a strengthening buffer mechanism.

[0023] In this solution, the shock-absorbing device is installed in the rotating shaft hole of the robotic arm of the large excavator, and then the rotating shaft is installed. At this time, the vibration impact between the rotating shaft and the robotic arm will be absorbed and buffered by the shock-absorbing device.

[0024] According to the diameter size of the rotating shaft, the appropriate-sized limiting collar rings 3 are used to connect with the rotating shaft. Since the limiting collar rings 3 are slidably connected with each other, the limiting collar rings 3 smaller than the size of the rotating shaft will not hinder the normal installation of the rotating shaft by being pushed outwards.

[0025] During vibration impact, the buffer rubber sleeve 1 can effectively absorb vibration through flexible deformation. Moreover, the arrangement of the internal buffer cavities 2 enables it to withstand a larger deformation range, improves the intensity of vibration absorption, and is also conducive to the buffer rubber sleeve 1 to recover from deformation. This is because after the buffer rubber sleeve 1 deforms, the space inside the buffer cavity 2 can carry the part squeezed in from other deformed positions, making the deformable range larger. And this kind of deformation is squeezing towards its own interior. Compared with the traditional solid rubber pad, after being compressed and deformed, all positions are squeezed outwards, resulting in stress concentration and being prone to not being able to recover after deformation. This solution is more conducive to the dispersion of external forces, avoids stress concentration, and thus improves the recovery ability after deformation.

[0026] In addition to the buffer rubber sleeve 1, the vibration is further buffered and absorbed through the strengthening buffer mechanism installed outside, improving the shock-absorbing performance.

[0027] As shown Figure 1 in the figure, the anti-disengagement part includes a groove 4 opened on the inner wall of the outermost limiting collar ring 3 along the normal direction and a slider 5 fixed on the outer wall of the inner limiting collar ring 3; the slider 5 is slidably connected with the groove 4 correspondingly.

[0028] When the rotating shaft is installed, the limiting collar 3 smaller than the size of the rotating shaft is pushed outwards. The slider 5 on the pushed limiting collar 3 will slide along the corresponding groove 4, and through the blocking and limitation of the groove 4 on the slider 5, the limiting collar 3 can be prevented from falling off.

[0029] As Figure 4 shown, the strengthening and buffering mechanism includes a positioning frame 6 coaxially fixed at the end of the buffer rubber sleeve 1; a plurality of shock-absorbing springs 7 are evenly distributed along the circumference outside the outermost limiting collar 3; one end of the shock-absorbing spring 7 is connected to the outer wall of the outermost limiting collar 3, and the other end is connected to the positioning frame 6.

[0030] The circumferentially connected shock-absorbing springs 7 can effectively buffer the vibration impacts in all directions generated by the rotating shaft through elastic deformation, and strengthen the ability of the shock-absorbing device to withstand vibration impacts.

[0031] As Figure 4 shown, the positioning frame 6 is provided with a limiting mechanism for blocking the movement of the limiting collar 3 towards the side of the positioning frame 6; the limiting mechanism includes a through hole 8 opened on the protruding end of the outermost limiting collar 3; a sliding sleeve 9 is fixed on the positioning frame 6; the sliding sleeve 9 and the through hole 8 are distributed along the radial direction of the limiting collar 3; a blocking block 10 is slidably connected in the sliding sleeve 9; one end of the blocking block 10 passes through the through hole 8, and the other end is rotatably connected with an adjusting bolt 11; the adjusting bolt 11 is arranged in the same direction as the blocking block 10 and is threadedly connected with the positioning frame 6.

[0032] By adjusting the bolt 11, the blocking block 10 can be driven to move along the radial direction of the limiting collar 3, and the blocking block 10 blocks the outer end of the limiting collar 3 sleeved on the rotating shaft, thereby improving the stability after the installation of the rotating shaft, effectively preventing the limiting collar 3 from sliding, and avoiding the problem of axial movement of the rotating shaft.

[0033] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A shock absorbing device for a large excavator, characterized in that: It comprises a buffer rubber sleeve (1) which is sleeved and fixed in the hole of the mechanical arm shaft; the buffer rubber sleeve (1) is provided with a support component for connecting with the mechanical arm shaft; The buffer rubber sleeve (1) has a plurality of buffer cavities (2) distributed axially inside; adjacent buffer cavities (2) are staggered in radial direction; The support assembly comprises a plurality of limiting rings (3) which are concentrically sleeved on the inner side of the buffer rubber sleeve (1) in sequence; adjacent limiting rings (3) are slidably connected to each other; adjacent limiting rings (3) are each provided with an anti-slip component for preventing the limiting rings (3) from slipping out; the outermost limiting ring (3) is fixedly connected to the buffer rubber sleeve (1); one end of the outermost limiting ring (3) extends from the inner side of the buffer rubber sleeve (1) and is connected to the robot arm via a reinforced buffer mechanism.

2. A large excavator shock absorbing device according to claim 1, characterized in that: The anti-slip component comprises a groove (4) opened along the normal direction on the inner wall of the outer limiting collar (3) and a slider (5) fixed on the outer wall of the inner limiting collar (3); the slider (5) is correspondingly slidably connected to the groove (4).

3. A large excavator shock absorbing device according to claim 1, characterized in that: The reinforced buffer mechanism comprises a positioning frame (6) coaxially fixed to the end of the buffer rubber sleeve (1); a plurality of damping springs (7) are evenly distributed along the circumferential direction outside the outermost limiting ring (3); one end of the damping spring (7) is connected to the outer wall of the outermost limiting ring (3), and the other end is connected to the positioning frame (6).

4. A large excavator shock absorbing device according to claim 3, characterized in that: The positioning frame (6) is provided with a limiting mechanism for preventing the limiting ring (3) from moving toward one side of the positioning frame (6); the limiting mechanism comprises a through hole (8) opened on the protruding end of the outermost limiting ring (3); a sliding sleeve (9) is fixed on the positioning frame (6); the sliding sleeve (9) and the through hole (8) are distributed along the radial direction of the limiting ring (3); a stopper (10) is slidably connected inside the sliding sleeve (9); one end of the stopper (10) passes through the through hole (8), and the other end is rotatably connected to an adjusting bolt (11); the adjusting bolt (11) is arranged in the same direction as the stopper (10) and is threadedly connected to the positioning frame (6).

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