A shock absorption device for large excavators

Abstract

This invention discloses a shock absorption device for a large excavator, relating to the technical field of excavator components. It includes a buffer sleeve fixedly fitted into the shaft hole of a robotic arm; a support assembly on the buffer sleeve for connection to the robotic arm shaft; multiple buffer cavities distributed axially inside the buffer sleeve; adjacent buffer cavities staggered radially; the support assembly includes multiple limiting rings concentrically fitted inside the buffer sleeve; adjacent limiting rings slidably connected to each other; each adjacent limiting ring has an anti-detachment component to prevent it from dislodging; the outermost limiting ring is fixedly connected to the buffer sleeve; one end of the outermost limiting ring extends from the inside of the buffer sleeve and is connected to the robotic arm via a reinforced buffer mechanism. The beneficial effects of this invention are: it can buffer and absorb shock at the robotic arm shaft position, has strong adaptability to installed shafts, and provides good shock absorption.

Description

Technical Field

[0001] This invention relates to the field of excavator parts technology, and in particular to a shock absorption device for large excavators. Background Technology

[0002] Due to the nature of their operation, large excavators frequently generate impact loads, resulting in significant vibrations and shocks. If left uncontrolled, these vibrations not only affect the machine's stability and significantly shorten its lifespan, but also cause discomfort and safety hazards to operators. Therefore, the design of the buffer structure in a large excavator platform is crucial; it can effectively absorb various vibrations and shocks, improving operational stability and safety.

[0003] Current shock absorption devices buffer the area between the cab and the frame, as well as the excavator's walking system. However, they typically lack buffering for the hinged pivot of the robotic arm, relying solely on the strength of the robotic arm and the hinged pivot itself. In the event of severe vibration, this can easily lead to damage to the pivot and robotic arm, resulting in malfunctions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a shock absorption device for large excavators, which can buffer and absorb shock at the pivot position of the robotic arm, has strong adaptability to the installed pivot, and has a good buffering and shock absorption effect.

[0005] The technical solution adopted in this invention is: to provide a shock absorption device for a large excavator, including a buffer sleeve that is fitted and fixed in the shaft hole of the robotic arm; the buffer sleeve is provided with a support component for connecting with the shaft of the robotic arm;

[0006] The buffer sleeve has multiple buffer cavities distributed axially inside; adjacent buffer cavities are staggered in the radial direction.

[0007] The support assembly includes multiple limiting rings that are concentrically fitted inside the buffer sleeve; adjacent limiting rings are slidably connected to each other; each adjacent limiting ring is provided with an anti-detachment component to prevent the limiting ring from coming off; the outermost limiting ring is fixedly connected to the buffer sleeve; one end of the outermost limiting ring extends out from the inside of the buffer sleeve and is connected to the robotic arm through a reinforcing buffer mechanism.

[0008] To further optimize this technical solution, an anti-detachment component for a large excavator shock absorber includes a groove formed along the normal direction on the inner wall of the outer limiting collar and a slider fixed to the outer wall of the inner limiting collar; the slider and the groove are slidably connected.

[0009] To further optimize this technical solution, a reinforced buffer mechanism for a large excavator shock absorption device includes a positioning frame coaxially fixed to the end of the buffer rubber sleeve; multiple shock-absorbing springs are evenly distributed circumferentially on the outermost limiting collar; one end of the shock-absorbing 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 positioning frame for a large excavator shock absorber is provided with a limiting mechanism for preventing a limiting collar from moving toward one side of the positioning frame; the limiting mechanism includes a through-hole on the outermost protruding end of the 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 stop block is slidably connected inside the sliding sleeve; one end of the stop 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 stop block and is threadedly connected to the positioning frame.

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

[0012] The buffer sleeve separates the rotating shaft from the robotic arm, absorbing the impact generated by this interaction and effectively cushioning and reducing vibration. Multiple buffer cavities are distributed axially within the buffer sleeve. These cavities facilitate the recovery of the buffer sleeve after impact deformation, effectively increasing its deformation tolerance. Adjacent buffer cavities are staggered radially, ensuring both strong recovery performance after deformation and sufficient support for the rotating shaft.

[0013] The multiple limiting collars can accommodate the installation of shafts with different diameters, and the enhanced buffer mechanism further improves the vibration damping effect at the shaft. Attached Figure Description

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

[0015] Figure 2 This is a schematic diagram of the axial cross-section of the buffer rubber sleeve;

[0016] Figure 3 This is a schematic diagram of the radial cross-section of the cushioning rubber sleeve;

[0017] Figure 4 A structural diagram illustrating the reinforcement of the buffer and limiting mechanisms.

[0018] In the diagram, 1. Buffer sleeve; 2. Buffer cavity; 3. Limiting collar; 4. Groove; 5. Slider; 6. Positioning frame; 7. Shock-absorbing spring; 8. Through port; 9. Sliding sleeve; 10. Stop block; 11. Adjusting bolt. Detailed Implementation

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

[0020] like Figure 1 As shown, a shock absorption device for a large excavator includes a buffer sleeve 1 that is fitted and fixed in the shaft hole of the robotic arm; the buffer sleeve 1 is provided with a support assembly for connecting with the shaft of the robotic arm.

[0021] like Figure 2-3 As shown, the buffer sleeve 1 has multiple buffer cavities 2 distributed axially inside; adjacent buffer cavities 2 are staggered in the radial direction.

[0022] like Figure 1 , Figure 4 As shown, the support assembly includes a plurality of limiting collars 3 concentrically sleeved inside the buffer sleeve 1; adjacent limiting collars 3 are slidably connected to each other; each adjacent limiting collar 3 is provided with an anti-detachment component to prevent the limiting collar 3 from coming off; the outermost limiting collar 3 is fixedly connected to the buffer sleeve 1; one end of the outermost limiting collar 3 extends out from the inside of the buffer sleeve 1 and is connected to the robotic arm through a reinforcing buffer mechanism.

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

[0024] Based on the diameter of the shaft, a appropriately sized retaining collar 3 is used to connect to the shaft. Since the retaining collars 3 are slidably connected to each other, retaining collars 3 smaller than the shaft size will not obstruct the normal installation of the shaft by being pushed outwards.

[0025] During vibration and impact, the buffer sleeve 1 effectively absorbs shock through flexible deformation. Furthermore, the internal buffer cavity 2 allows it to withstand a larger deformation range, enhancing its shock absorption strength and facilitating its recovery from deformation. This is because after deformation, the space within the buffer cavity 2 can accommodate the portion squeezed in from other deformed areas, resulting in a larger tolerable deformation range. Moreover, this deformation is an inward compression, unlike traditional solid rubber pads where all areas are compressed outwards after deformation, leading to stress concentration and a high risk of irrecoverable deformation. This design is more effective at dispersing external forces, avoiding stress concentration, and thus improving recovery ability after deformation.

[0026] In addition to the buffer sleeve 1, the vibration is further buffered and absorbed by the externally installed reinforced buffer mechanism, thereby improving the shock absorption performance.

[0027] like Figure 1 As shown, the anti-detachment component includes a groove 4 formed along the normal direction on the inner wall of the outer limiting collar 3, and a slider 5 fixed to the outer wall of the inner limiting collar 3; the slider 5 is slidably connected to the groove 4.

[0028] When the rotating shaft is installed, the limiting collar 3, which is smaller than the size of the rotating shaft, is pushed outward. The slider 5 on the pushed limiting collar 3 will slide along the corresponding groove 4. The groove 4 blocks and limits the slider 5, which can prevent the limiting collar 3 from falling off.

[0029] like Figure 4 As shown, the reinforced buffer mechanism includes a positioning frame 6 coaxially fixed to the end of the buffer sleeve 1; a plurality of shock-absorbing springs 7 are evenly distributed circumferentially on 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 damping spring 7 can effectively buffer the vibration impacts generated by the rotating shaft through elastic deformation, thereby enhancing the damping device's ability to withstand vibration impacts.

[0031] like Figure 4 As shown, the positioning frame 6 is provided with a limiting mechanism to prevent the limiting collar 3 from moving toward one side of the positioning frame 6; the limiting mechanism includes a through-hole 8 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 stop block 10 is slidably connected inside the sliding sleeve 9; one end of the stop block 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 stop block 10 and is threadedly connected to the positioning frame 6.

[0032] By adjusting the bolt 11, the stop block 10 can be moved radially along the limiting collar 3, blocking the outer end of the limiting collar 3 fitted on the rotating shaft. This improves the stability of the rotating shaft after installation, effectively prevents the limiting collar 3 from slipping, and avoids the problem of axial movement of the rotating shaft.

[0033] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings 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 invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A shock absorbing device for a large excavator, characterized by: The buffer rubber sleeve (1) is fixed in the mechanical arm rotating shaft hole; the support assembly is arranged on the buffer rubber sleeve (1) and is connected with the mechanical arm rotating shaft; A plurality of buffer cavities (2) are arranged in the buffer rubber sleeve (1) along the axial direction; the adjacent buffer cavities (2) are staggered in the radial direction; The support assembly comprises a plurality of limiting rings (3) which are concentrically sleeved in the buffer rubber sleeve (1) in sequence; the adjacent limiting rings (3) are connected with each other in sliding mode; the adjacent limiting rings (3) are provided with anti-disengagement members for preventing the limiting rings (3) from disengaging; the outermost limiting ring (3) is fixedly connected with 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 with the mechanical arm through a reinforcing buffer mechanism; The reinforcing buffer mechanism comprises a positioning frame (6) which is coaxially fixed on the end of the buffer rubber sleeve (1); a plurality of shock-absorbing springs (7) are uniformly distributed on the outer side of the outermost limiting ring (3) in the circumferential direction; one end of the shock-absorbing spring (7) is connected with the outer wall of the outermost limiting ring (3), and the other end is connected with the positioning frame (6); The positioning frame (6) is provided with a limiting mechanism for preventing the limiting ring (3) from moving towards the side of the positioning frame (6); the limiting mechanism comprises a through hole (8) which is opened on the extending end of the outermost limiting ring (3); the positioning frame (6) is fixedly provided with a sliding sleeve (9); the sliding sleeve (9) and the through hole (8) are arranged along the radial direction of the limiting ring (3); the sliding sleeve (9) is slidably connected with a stop block (10); one end of the stop block (10) penetrates 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 stop block (10) and is threadedly connected with the positioning frame (6).

2. A shock absorbing device for a large excavator according to claim 1, characterized in that: The anti-disengagement member comprises a groove (4) which is opened on the inner wall of the outer limiting ring (3) in the normal direction, and a sliding block (5) which is fixed on the outer wall of the inner limiting ring (3); the sliding block (5) is slidably connected with the groove (4).

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