A limit structure of an oil cylinder of a shovel of an excavator

Abstract

This utility model provides a limiting structure for an excavator bucket cylinder, belonging to the field of excavator technology. It includes a stick and a breaker hammer, connected by a pin. A rocker arm is rotatably connected to the stick, and a connecting rod is rotatably connected to the breaker hammer. The rocker arm and connecting rod are connected by a pin. A bucket cylinder is located at the top of the stick, and the piston rod of the bucket cylinder is hinged to the pin between the rocker arm and the connecting rod. An upper limit stop is provided at the top of the stick, with its sidewall near the rocker arm fitting into the rocker arm. A lower limit stop is provided at the bottom of the stick, with its sidewall near the breaker hammer fitting into the sidewall of the breaker hammer. This utility model can limit the piston rod of the bucket cylinder, preventing it from being pulled or squeezed, thus improving the service life of the bucket cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of excavator technology, and in particular relates to a limiting structure for the hydraulic cylinder of an excavator bucket. Background Technology

[0002] A hydraulic breaker is an attachment for excavators, commonly used for breaking rocks and road surfaces. When excavators are used for tunnel excavation, it is necessary to break rocks inside the tunnel, thus requiring frequent adjustments to the breaker's angle. The breaker is connected to the piston rod of the bucket cylinder on the excavator's boom via a rocker arm and connecting rod. The angle of the breaker is controlled by the bucket cylinder. When the breaker strikes rocks, the irregular shape of the rocks and the vibration of the breaker cause it to swing significantly. If the piston rod of the bucket cylinder is at its maximum or minimum stroke position at this time, the piston rod is easily pulled or squeezed, reducing the service life of the bucket cylinder. Utility Model Content

[0003] In view of the defects or deficiencies in the existing technology, this utility model provides a limiting structure for excavator bucket cylinder, which can limit the piston rod of bucket cylinder, prevent the piston rod of bucket cylinder from being pulled or squeezed, and improve the service life of bucket cylinder.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An embodiment of this utility model provides a limiting structure for an excavator bucket cylinder, including a stick and a breaker hammer. The stick and the breaker hammer are connected by a pin. A rocker arm is rotatably connected to the stick, and a connecting rod is rotatably connected to the breaker hammer. The rocker arm and the connecting rod are connected by a pin. A bucket cylinder is provided at the top of the stick, and the piston rod of the bucket cylinder is hinged to the pin between the rocker arm and the connecting rod.

[0006] The top of the stick is provided with an upper limit position, and the side wall of the upper limit position near the rocker arm is adapted to the rocker arm. The bottom of the stick is provided with a lower limit position, and the side wall of the lower limit position near the breaker hammer is adapted to the side wall of the breaker hammer.

[0007] Furthermore, a front support is provided at the front end of the boom, and a bearing is provided at the end of the breaker hammer near the boom. The front support is rotatably connected to the lower part of the bearing via a pin.

[0008] Furthermore, a central support is provided at the front end of the stick, one end of the rocker arm is rotatably connected to the central support via a pin, and the other end is rotatably connected to the connecting rod via a pin, with the end of the connecting rod away from the rocker arm rotatably connected to the upper part of the shaft seat.

[0009] Furthermore, there are two rocker arms, which are parallel to each other and located on both sides of the boom. The two rocker arms are rotatably connected to the connecting rod via a pin.

[0010] Furthermore, the top of the rear end of the boom is symmetrically provided with ear plates, and the cylinder of the bucket cylinder is rotatably connected to the ear plates.

[0011] Furthermore, the upper limit position includes two limiting blocks, which are symmetrically arranged at the end of the bucket cylinder barrel away from the ear plate and at a set distance from the barrel of the bucket cylinder.

[0012] Furthermore, the two limit blocks are respectively set to correspond to the two joysticks.

[0013] Furthermore, a set distance is set between the two limit blocks, and the piston rod of the bucket cylinder is located between the two limit blocks.

[0014] Furthermore, a support rod is connected between the two limiting blocks, and the support rod is located below the piston rod of the bucket cylinder.

[0015] Furthermore, side plates are provided at both ends of the lower limit position, and the side plates are welded and fixed inside the lower limit position.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model sets an upper limit position at the top of the stick, and the side wall of the upper limit position near the rocker arm is adapted to the rocker arm. Before the piston rod of the bucket cylinder reaches its minimum stroke, the rocker arm first contacts the upper limit position, and the upper limit position supports the rocker arm, preventing the piston rod from continuing to retract, thus avoiding the piston rod of the bucket cylinder from being squeezed and effectively protecting the bucket cylinder.

[0018] 2. This utility model sets a lower limit at the bottom of the boom, and the side wall of the lower limit near the breaker hammer is adapted to the side wall of the breaker hammer. Before the piston rod of the bucket cylinder reaches its maximum stroke, the breaker hammer contacts the lower limit first. The lower limit supports the breaker hammer and prevents the piston rod from extending, thus avoiding the piston rod of the bucket cylinder being stretched and improving the service life of the bucket cylinder. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the limiting structure in an embodiment of the present utility model;

[0020] Figure 2 This is a diagram showing the bucket cylinder retracted in an embodiment of this utility model.

[0021] Figure 3 This is a diagram showing the extended state of the bucket cylinder in an embodiment of this utility model;

[0022] Among them, 1. boom; 2. breaker hammer; 3. rocker arm; 4. connecting rod; 5. bucket cylinder; 6. ear plate; 7. upper limit position; 71. limit block; 72. support rod; 8. lower limit position; 81. side plate. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] A typical embodiment of this utility model is as follows: Figure 1 As shown, a limit structure for a bucket cylinder of an excavator includes a boom 1 and a breaker hammer 2. The boom 1 and the breaker hammer 2 are connected by a pin. Specifically, a front support is provided at the front end of the boom 1, and a bearing is provided at the end of the breaker hammer 2 near the boom 1. The front support is rotatably connected to the lower part of the bearing by a pin, allowing the breaker hammer 2 to rotate around the pin. A rocker arm 3 and a connecting rod 4 are also connected between the boom 1 and the breaker hammer 2. A middle support is also provided at the front end of the boom 1, located near the front support. One end of the rocker arm 3 is rotatably connected to the middle support by a pin, and the other end is rotatably connected to the connecting rod 4 by a pin. The end of the connecting rod 4 away from the rocker arm 3 is rotatably connected to the upper part of the bearing. The rocker arm 3 and the connecting rod 4 can drive the breaker hammer 2 to move.

[0025] It is known that there are two rocker arms 3, which are parallel to each other and located on both sides of the stick 1. The two rocker arms 3 are rotatably connected to the connecting rod 4 through a pin.

[0026] The top of the boom 1 is also equipped with a bucket cylinder 5. The rear end of the boom 1 is symmetrically equipped with ear plates 6. The cylinder of the bucket cylinder 5 is rotatably connected to the ear plates 6. The piston rod of the bucket cylinder 5 is hinged on the pin between the rocker arm 3 and the connecting rod 4. When the piston rod of the bucket cylinder 5 extends or retracts, it can drive the rocker arm 3 and the connecting rod 4 to move, thereby driving the breaker hammer 2 to rotate around the pin.

[0027] The top of the boom 1 is also equipped with an upper limit position 7, such as... Figure 2 As shown, the upper limit position 7 includes two limit blocks 71. The two limit blocks 71 are symmetrically arranged at the end of the cylinder of the bucket cylinder 5 away from the ear plate 6 and are at a set distance from the cylinder of the bucket cylinder 5. The two limit blocks 71 are respectively arranged corresponding to the two rockers 3, and the side wall of the two limit blocks 71 near the two rockers 3 is adapted to the rockers 3.

[0028] When the piston rod of the bucket cylinder 5 retracts, it drives the connecting rod 4 and the rocker arm 3 to move, causing the breaker hammer 2 to rotate. Before reaching the minimum stroke of the cylinder, the rocker arm 3 first contacts the limit block 71. The limit block 71 supports the rocker arm 3 and prevents the piston rod from retracting further. By setting two limit blocks 71 corresponding to the two rocker arms 3 respectively, the contact area between the limit block 71 and the rocker arm 3 can be increased, the concentrated stress can be reduced, and the impact can be buffered by the limit block 71 and transmitted to the stick 1.

[0029] The two limiting blocks 71 are spaced apart by a set distance, allowing the piston rod to pass between them without interfering with the movement of the piston rod. A support rod 72 is also connected between the two limiting blocks 71, located below the piston rod, and will not interfere with its movement. During the process of limiting the rocker arm 3 and the connecting rod 4, the two limiting blocks 71 will generate an inward torque. By setting the support rod 72 between the two limiting blocks 71, the lateral stress caused by the impact can be effectively relieved, preventing cracking.

[0030] The bottom of the boom 1 is provided with a lower limit 8, which is located at the end of the boom 1 near the breaker 2, such as... Figure 3 As shown, the lower limit 8 is V-shaped and is formed by bending a steel plate. The side wall of the lower limit 8 near the breaker 2 is adapted to the side wall of the breaker 2.

[0031] When the piston rod of the bucket cylinder 5 extends, it drives the connecting rod 4 and the rocker arm 3 to move, causing the breaker hammer 2 to rotate. Before reaching the maximum stroke of the cylinder, the side wall of the breaker hammer 2 first contacts the side wall of the lower limit 8. The lower limit 8 supports the breaker hammer 2 and prevents the piston rod from extending further. The impact on the breaker hammer 2 is transmitted to the lower limit 8, so that the piston rod of the cylinder will not be subjected to an outward stretching force due to the impact on the breaker hammer 2.

[0032] Both ends of the lower limit position 8 are provided with side plates 81. The shape of the side plates 81 is adapted to the shape of the end face of the lower limit position 8. The side plates 81 are welded and fixed inside both ends of the lower limit position 8 to support the lower limit position 8. By setting the side plates 81, the structural strength of the lower limit position 8 can be increased, enabling the lower limit position 8 to withstand greater impact and effectively protect the oil cylinder.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bucket cylinder limiting structure, characterized in that, It includes a boom and a breaker hammer, which are connected by a pin. A rocker arm is rotatably connected to the boom, and a connecting rod is rotatably connected to the breaker hammer. The rocker arm and the connecting rod are connected by a pin. A bucket cylinder is provided at the top of the boom, and the piston rod of the bucket cylinder is hinged to the pin between the rocker arm and the connecting rod. The top of the stick is provided with an upper limit position, and the side wall of the upper limit position near the rocker arm is adapted to the rocker arm. The bottom of the stick is provided with a lower limit position, and the side wall of the lower limit position near the breaker hammer is adapted to the side wall of the breaker hammer.

2. The oil cylinder stopper structure for a shovel according to Claim 1, wherein The front end of the boom is provided with a front support, and the end of the breaker hammer near the boom is provided with a bearing seat. The front support is rotatably connected to the lower part of the bearing seat by a pin.

3. The oil cylinder stopper structure for a shovel according to claim 2, wherein The front end of the stick is also provided with a central support. One end of the rocker arm is rotatably connected to the central support via a pin, and the other end is rotatably connected to the connecting rod via a pin. The end of the connecting rod away from the rocker arm is rotatably connected to the upper part of the shaft seat.

4. The oil cylinder stopper structure for a shovel according to claim 3, wherein The device has two rockers, which are parallel to each other and located on both sides of the stick. The two rockers are rotatably connected to the connecting rod by a pin.

5. The oil cylinder stopper structure for a shovel according to claim 4, wherein The top rear end of the boom is symmetrically provided with ear plates, and the cylinder of the bucket cylinder is rotatably connected to the ear plates.

6. A bucket cylinder stop structure as claimed in claim 5, wherein The upper limit position includes two limiting blocks, which are symmetrically arranged at the end of the bucket cylinder barrel away from the ear plate and at a set distance from the barrel of the bucket cylinder.

7. A bucket cylinder stop structure as claimed in claim 6, wherein The two limit blocks are respectively set to correspond to the two joysticks.

8. The oil cylinder stopper structure for a shovel according to claim 6, wherein The two limit blocks are spaced at a set distance, and the piston rod of the bucket cylinder is located between the two limit blocks.

9. The bucket cylinder limiting structure as described in claim 8, characterized in that, A support rod is also connected between the two limiting blocks, and the support rod is located below the piston rod of the bucket cylinder.

10. The oil cylinder stopper structure for a shovel according to claim 1, wherein Both ends of the lower limit position are provided with side plates, which are welded and fixed inside the lower limit position.

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