Hydraulic limiting device for excavating arm of backhoe loader

Abstract

The utility model discloses a hydraulic limiting device for a digging arm of a backhoe loader, which comprises a base, the base is connected with a swing frame, two holes are arranged on the base, a master pin is arranged in one hole, a piston is arranged in the other hole, one end of the master pin is connected with a main pressing plate, an elastic component which generates damping when the main pressing plate rotates is arranged on the main pressing plate, and the elastic component is connected with the swing frame. The other end of the main pin is connected with a piston through a connecting plate; and a spring for resetting the piston is arranged in the piston. A limiting stress part of the limiting device is separated from a moving part of the driving device and is flexibly connected with the moving part, so that faults caused by deformation and clamping stagnation of the driving device due to stress of the device are avoided. The utility model has the advantages of simple and reasonable structure, convenience in part processing, low manufacturing cost and high stability.

Description

Technical Field

[0001] This utility model relates to a hydraulic limiting device for a digging arm, and more particularly to a hydraulic limiting device for a digging arm of a digging loader. Background Technology

[0002] The excavator arm limit device is a safety protection device for excavator loaders. Its main function is to restrict the position of the excavator arm when the excavating part of the excavator is not working (loading part working, no-load driving, or stopped state), limiting the movement of the excavator arm and preventing it from sinking or falling off due to gravity or hydraulic leakage. When the excavator part of the excavator is to work, the position restriction on the excavator arm is released. Currently, most excavator loaders use hook-type limit devices between the excavator arm and the swing frame. The main shortcomings are: the limit hook enters the limited state by its own weight, the drive rod has low power, and it is not reliable enough. Summary of the Invention

[0003] The problem to be solved by this utility model is to provide a simple, reasonable, easy-to-manufacture, and stable excavator loader boom limiting device.

[0004] To solve the above problems, this utility model provides a hydraulic limiting device for the excavator arm of an excavator loader, which includes a base connected to a swing frame. The base has two holes, one of which contains a main pin and the other contains a piston. One end of the main pin is connected to a main pressure plate, and the main pressure plate has an elastic component that generates damping when it rotates. The other end of the main pin is connected to the piston through a connecting plate, and the piston has a spring inside for resetting the piston.

[0005] Preferably, the base is provided with a return and reset device for correcting the angular deviation of the main pressure plate.

[0006] When no hydraulic oil is supplied, the piston is in its first state (limited state) via a built-in spring. In the limited state, the main pressure plate contacts the lug welded to the excavator arm of the backhoe loader, restricting the excavator arm from sinking or dropping. When hydraulic oil is supplied, the hydraulic oil pushes the piston, which moves against the spring force and drives the main pressure plate to the second state (released state) via the connecting plate and the kingpin. In the released state, the main pressure plate leaves the range of motion of the lug on the excavator arm and does not interfere with the operation of the excavator arm. When the excavator is no longer working, after the excavator arm returns to the stop state (angle), the hydraulic oil of the limiting device is cut off, and the piston returns to the limited state through the action of the spring.

[0007] The limiting force-bearing part (main pressure plate, main pin) of the limiting device is separated from the moving part (piston, spring, etc.) of the drive device and flexibly connected to avoid malfunctions caused by deformation and jamming of the drive device due to force on the device.

[0008] This utility model has a simple and reasonable structure, convenient parts processing, low manufacturing cost, and high stability. Attached Figure Description

[0009] Figure 1 A cross-sectional view of the hydraulic limiting device for the excavator wall of the excavator loader provided by this utility model;

[0010] Figure 2 This is a side view of the hydraulic limiting device for the excavator wall of the excavator loader provided by this utility model;

[0011] Figure 3 Schematic diagrams of different states of the hydraulic limit device for the excavator wall of the excavator loader provided by this utility model;

[0012] Figure 4 This is a schematic diagram of the present invention installed on an excavator loader.

[0013] Figure 1-4 In the diagram, 1 is the base, 2 is the piston, 3 is the spring, 4 is the elastic component, 5 is the main pressure plate, 6 is the main pin, 7 is the connecting plate, 8 is the digging arm, 9 is the hydraulic limit device, 10 is the digging arm lug, 11 is the swing frame, A is the return and reset device, B is the hydraulic oil inlet, C is the digging arm lug, D is the first state, and E is the second state. Detailed Implementation

[0014] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0015] Example

[0016] like Figure 1-3 As shown, this utility model provides a hydraulic limiting device for the excavator arm of an excavator loader. It includes a base 1 connected to a swing frame. The base 1 has two holes; one hole houses a main pin 6, and the other hole houses a piston 2. One end of the main pin 6 is connected to a main pressure plate 5. The main pressure plate 5 has an elastic component 4 that generates damping during rotation. The other end of the main pin 6 is connected to the piston 2 via a connecting plate 7. The piston 2 contains a spring 3 for resetting its position. The base 1 is equipped with a return and reset device A for correcting angular deviation of the main pressure plate 5.

[0017] like Figure 4As shown, the base 1 is connected to the swing frame 11 by bolts. The base 1 has two holes. One hole is fitted with a main pin 6, one end of which is connected to the main pressure plate 5, serving as the force-bearing element of the hydraulic limit device of this utility model. The other hole of the base 1 is fitted with a piston 2, serving as the driving unit of the hydraulic limit device of this utility model. The main pin 6 and the piston 2 are connected by a connecting plate 7, which allows the piston 2 to drive the main pin 6 to move. The main pressure plate 5 is provided with an elastic component 4 for generating damping when the main pressure plate 5 rotates and for resetting it, so that the main pressure plate 5 has rotational damping and avoids noise caused by vibration of the excavator loader. The piston 2 is equipped with a spring 3, which allows the limit device to have a normally closed state, a first state, and a limited state, which meets the safety design. The base 1 is equipped with a return and reset device A, which is used to correct the angular deviation of the main pressure plate 5.

[0018] The two cavities on the base 1 are distributed as a load-bearing cavity and a driving cavity, and the two cavity elements are flexibly connected by a connecting plate 7 to ensure smooth movement of the driving element.

[0019] The piston 2 is driven by hydraulic oil or spring force, which in turn drives the main pin 6 and the main pressure plate 5 through the connecting plate 7. This causes the main pressure plate 5 to restrict and release the excavator arm lug C. When the excavator arm lug C is restricted, the excavator arm 8 is prevented from sinking or falling off when it is not in operation. When the excavator arm lug C is released, the excavator arm 8 can enter the working state.

[0020] When there is no hydraulic oil supply and no power, piston 2, under the action of spring 3, keeps hydraulic limit device 9 in a restricted state to ensure the sinking and boom status when the excavator loader stops working at the excavation end, thus ensuring equipment safety.

[0021] The main pressure plate 5 is equipped with an elastic component 4, which provides rotational damping for the main pressure plate 5 and prevents the excavator loader from vibrating and generating noise.

[0022] The main pressure plate 5 is equipped with an elastic component 4. When hydraulic oil is introduced, the elastic component is compressed to provide additional rebound force when the hydraulic oil is disconnected, thereby increasing the initial force when the main pressure plate 5 returns to its original position and reducing the possibility of jamming.

[0023] The base 1 is equipped with a return and reset device A, which is used to correct the angular deviation of the main pressure plate 5 and avoid excessive angular deviation of the main pressure plate 5 causing interference with the excavator arm lug, which would prevent the main pressure plate 5 from entering the limit state.

[0024] First state

[0025] The first state D is the normal state of the hydraulic limit device of this utility model, which is the state where no hydraulic oil is supplied. In the first state D, under the action of the spring 3, the piston 2, the universal connecting plate 7, and the main pin 6 drive the main pressure plate 5 to be in the first state D. In the first state D, the main pressure plate 5 is within the range of the digging arm lug C, restricting the digging arm lug C from rotating along the rotation center of the digging arm, restricting the digging arm from sinking or falling, and playing a safety protection role.

[0026] Second state

[0027] The second state E is the state when hydraulic oil is introduced into the present invention, which is the state in which the digging part of the excavator loader is to work. In the second state E, hydraulic oil enters the piston 2 hole of the base 1 through the hydraulic oil inlet B, pushing the piston 2 to move against the force of the spring 3. The universal connecting plate 7 and the main pin 6 drive the main pressure plate 5 to move to state E. In the second state E, the main pressure plate 5 leaves the rotation range of the digging arm lug C, no longer restricting the movement of the digging arm, so that the digging part of the excavator loader can work.

[0028] The main pressure plate 5 is provided with an elastic component 4: it pre-applies force to the main pressure plate 5, so that the main pressure plate 5 has damping, and eliminates impact noise under the play of the main pressure plate 5; in the second state, the elastic component 4 is compressed again to add extra rebound force when returning to the first state.

[0029] The base is equipped with a main pressure plate 5 return and reset device A. Its main purpose is to reset the main pressure plate 5 deflection and limit the rotation of the main pressure plate 5 in the second state, so as to avoid interference caused by the deflection of the main pressure plate 5 when switching states and thus prevent it from entering the first state position.

[0030] The main pin 6, which bears the torque, and the piston 2, which provides the driving force, are flexibly connected in different holes in the base 1 to avoid the piston 2, a precision component, from getting stuck due to deformation under force, which would cause the limiting device to malfunction.

Claims

1. A hydraulic limiting device for the excavator arm of an excavator loader, characterized in that, Includes a base (1), which is connected to a swing frame. The base (1) has two holes, one of which contains a main pin (6) and the other contains a piston (2). One end of the main pin (6) is connected to a main pressure plate (5). The main pressure plate (5) has an elastic component (4) for generating damping when it rotates. The other end of the main pin (6) is connected to the piston (2) through a connecting plate (7). The piston (2) contains a spring (3) for resetting the piston (2).

2. The hydraulic limiting device for the excavator arm of a backhoe loader as described in claim 1, characterized in that, The base (1) is provided with a return and reset device (A) for correcting the angular deviation of the main pressure plate (5).

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