Anti-shake balancing valve module, luffing hydraulic system and winch hydraulic system

Abstract

The present invention relates to an anti-vibration balancing valve module, comprising a balancing valve body, a damping network for controlling the opening of the balancing valve body, an oil control port K, and an oil drain port L. The damping network comprises a main oil circuit, a control oil circuit, a pressure-stabilizing oil circuit, and an oil drain port L. The main oil circuit is drawn out from the oil control port K and then divided into two circuits. One circuit forms a control oil circuit and is connected to the control chamber of the balancing valve body, and the other circuit forms an oil drain circuit and is connected to the oil drain port L. The pressure-stabilizing oil circuit is connected between the control oil circuit and the oil drain port L. A hydraulically controlled throttle valve is provided on the pressure-stabilizing oil circuit, and the control chamber of the hydraulically controlled throttle valve is connected to the oil drain circuit via a branch oil circuit. The present invention also relates to a variable amplitude hydraulic system and a winch hydraulic system including the balancing valve module. The opening of the balancing valve body is controlled by a damping network composed of multiple oil circuits, thereby eliminating the impact of the control pressure and filtering the vibration of the control pressure, so that the balancing valve body can be opened smoothly, thereby resolving the vibration problem of the balancing valve body caused by load pressure or temperature changes.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to an anti-shake balancing valve module for engineering machinery with a luffing mechanism and a hoisting mechanism, a luffing hydraulic system and a hoisting hydraulic system. Background Art

[0002] Truck cranes, crawler cranes, rotary drilling rigs and other construction machinery are all equipped with luffing or hoisting mechanisms. These mechanisms usually use a balancing valve to control the lowering of heavy objects. Due to the complex working conditions of the luffing and hoisting, the pressure during the lowering process fluctuates, which causes the luffing and hoisting to vibrate during the lowering process, seriously affecting the controllability and safety of the entire machine.

[0003] At present, in order to achieve stable descent of the luffing and hoisting mechanisms, damping is generally added to the control chamber and spring chamber of the balancing valve, or bypass damping is added to the control chamber to filter pressure fluctuations and reduce the jitter when the luffing and hoisting mechanisms fall. This solution has a certain inhibitory effect on the jitter and can reduce the amplitude of the jitter, but it cannot eliminate it fundamentally. It cannot meet all working conditions of different operating speeds and different lifting weights, and is easily affected by temperature. There will be no jitter when the temperature is low, but jitter when the temperature is high.

[0004] In the prior art, although the vibration of the boom lift and hoisting mechanism when they fall can be reduced by adding damping to the control chamber and spring chamber of the balancing valve, or by adding bypass damping to the control chamber, due to the many load conditions and large changes in load pressure of the boom lift and hoisting mechanism, the boom lift and hoisting mechanism will still vibrate when they fall under certain conditions. Summary of the Invention

[0005] In response to the shortcomings in the prior art, the present invention provides an anti-shake balancing valve module, a variable-length hydraulic system and a winch hydraulic system. The opening of the balancing valve body is controlled through a damping network composed of multiple oil circuits, thereby eliminating the impact of the control pressure and "filtering" the shake of the control pressure, so that the balancing valve body can open smoothly, solving the shake problem of the balancing valve body caused by load pressure or temperature changes.

[0006] In a first aspect, the present invention provides an anti-shake balancing valve module.

[0007] A vibration-proof balancing valve module includes a balancing valve body, a damping network for controlling the opening of the balancing valve body, an oil control port K and an oil drain port L. The damping network includes a main oil circuit, a control oil circuit, a pressure-stabilizing oil circuit and an oil drain circuit. The main oil circuit is divided into two circuits after being led out from the oil control port K. One circuit forms the control oil circuit and is connected to the control chamber of the balancing valve body, and the other circuit forms the oil drain circuit and is connected to the oil drain port L. The pressure-stabilizing oil circuit is connected between the control oil circuit and the oil drain port L. A hydraulically controlled throttle valve is provided on the pressure-stabilizing oil circuit, and the control chamber of the hydraulically controlled throttle valve is connected to the oil drain circuit through a branch oil circuit.

[0008] Optionally, a second damper is provided on the control oil circuit, and the second damper is located between the connecting point of the pressure stabilizing oil circuit and the control oil circuit and the balancing valve body.

[0009] Optionally, a first damper is provided on the control oil circuit, and a connection point between the pressure stabilizing oil circuit and the control oil circuit is located between the first damper and the second damper.

[0010] Optionally, a third damper is provided on the oil drain line.

[0011] Optionally, a fifth damper is provided on the oil drain circuit, and a connection point between the branch oil circuit and the oil drain circuit is located between the third damper and the fifth damper.

[0012] Optionally, a fourth damper is provided on the branch oil circuit.

[0013] Optionally, a filter is provided on the main oil circuit.

[0014] Optionally, the module further includes an oil port A and an oil port B, and when the balancing valve body is in an open state, the oil port B is connected to the oil port A.

[0015] In a second aspect, the present invention also provides a variable amplitude hydraulic system.

[0016] A variable amplitude hydraulic system comprises an anti-shake balancing valve module as described in any one of the first aspects above.

[0017] In a third aspect, the present invention also provides a winch hydraulic system

[0018] A winch hydraulic system comprises an anti-shake balancing valve module as described in any one of the first aspects above.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: the anti-shake balancing valve module of the present invention controls the opening of the balancing valve body through a damping network composed of multiple oil circuits, eliminates the impact of the control pressure, "filters" the vibration of the control pressure, enables the balancing valve body to open smoothly, and solves the vibration problem of the balancing valve body caused by load pressure or temperature changes. By controlling the throttling area of ​​the hydraulically controlled throttle valve, the pressure of the control oil circuit can be smoothly adjusted. By designing the size of the damping holes of each damper, the speed of opening of the hydraulically controlled throttle valve and the speed of opening of the balancing valve body can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the anti-shake balancing valve module according to the first embodiment of the present invention.

[0021] In the attached figure: 1-filter, 2-first damper, 3-second damper, 4-third damper, 5-fourth damper, 6-fifth damper, 7-hydraulic controlled throttle valve, 8-balancing valve body. DETAILED DESCRIPTION

[0022] The following description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0023] Example 1

[0024] An anti-shake balancing valve module includes a balancing valve body 8, a damping network for controlling the opening of the balancing valve body 8, an oil control port K and an oil drain port L. The damping network includes a main oil circuit, a control oil circuit, a pressure-stabilizing oil circuit and an oil drain circuit. The main oil circuit is divided into two circuits after being led out from the oil control port K. One circuit forms the control oil circuit and is connected to the control chamber of the balancing valve body 8, and the other circuit forms the oil drain circuit and is connected to the oil drain port L. The pressure-stabilizing oil circuit is connected between the control oil circuit and the oil drain port L. A hydraulically controlled throttle valve 7 is provided on the pressure-stabilizing oil circuit. The control chamber of the hydraulically controlled throttle valve 7 is connected to the oil drain circuit through a branch oil circuit.

[0025] More specifically, a second damper 3 is provided on the control oil circuit, and the second damper 3 is located between the connection point between the pressure-stabilizing oil circuit and the control oil circuit and the balancing valve body 8; a first damper 2 is also provided on the control oil circuit, and the connection point between the pressure-stabilizing oil circuit and the control oil circuit is located between the first damper 2 and the second damper 3; a third damper 4 is provided on the oil leakage circuit; a fifth damper 6 is provided on the oil leakage circuit, and the connection point between the branch oil circuit and the oil leakage circuit is located between the third damper 4 and the fifth damper 6; a fourth damper 5 is provided on the branch oil circuit; and a filter 1 is provided on the main oil circuit.

[0026] The balancing valve module of this embodiment has four oil ports: oil control port K, oil drain port L, oil port A and oil port B. The oil drain port L is connected to the oil tank, the oil port A is connected to the multi-way valve, and the oil port B is connected to the drop port of the luffing or winch.

[0027] like Figure 1 As shown, when working, the control oil from the luffing or hoisting is connected to the control oil port L, and the control oil of the main oil circuit passes through the filter 1, the first damper 2 and the second damper 3 and is connected to the control chamber of the balance valve body 8, and the balance valve is controlled to open. Since the control oil passes through the pressure-stabilizing oil circuit of the hydraulically controlled throttle valve 7 and the oil drain port L between the first damper 2 and the second damper 3 and returns to the oil tank, the control chamber of the balance valve body 8 cannot immediately build up pressure when the control oil is just introduced; at the same time, the control oil of the main oil circuit passes through the filter 1, the third damper 4 and the fourth damper 5 and the control chamber of the balance valve body 8 The hydraulically controlled throttle valve 7 is reversed. Since the control oil returns to the oil tank between the third damper 4 and the fourth damper 5 through the branch oil circuit of the fifth damper 6 and the oil drain port L, the fifth damper 6 can eliminate the impact and vibration of the control pressure and make the hydraulically controlled throttle valve 7 open smoothly; when the hydraulically controlled throttle valve 7 is reversed, its throttle port becomes smaller. At this time, the control pressure is established through the first damper 2 and the second damper 3 to the pressure of the control chamber of the balancing valve body 8, and the balancing valve body 8 starts to reverse. When it is in the open state, the oil port B is connected to the oil port A, and the boom or winch starts to fall.

[0028] When the control oil from the luffing or hoisting is reduced, the oil in the control chamber of the hydraulically controlled throttle valve 7 passes through the fourth damper 5 and can then return to the oil tank through the fifth damper 6 and the oil drain port L. It can also drain through the third damper 4 and the filter 1 to the oil control port K, so that the hydraulically controlled throttle valve 7 can quickly recover from the small throttling area position to the large throttling area position. The oil in the control chamber of the balancing valve body 8 passes through the second damper 3 and can then return to the oil tank through the hydraulically controlled throttle valve 7 and the oil drain port L. It can also return to the oil tank through the second damper 3, the first damper 2, the third damper 4, the fifth damper 6 and the oil drain port L. It can also drain through the second damper 3, the first damper 2, the filter 1 and the oil control port K, so that the balancing valve body 8 can be quickly closed.

[0029] In the structure, the first damper 2, the second damper 3 and the hydraulically controlled throttle valve 7 are equivalent to forming a first-stage damping network for controlling the balancing valve body 8; the third damper 4, the fourth damper 5 and the fifth damper 6 are equivalent to forming a second-stage damping network for controlling the hydraulically controlled throttle valve 7. The two-stage damping network thus formed is used to control the opening of the balancing valve body 8, which can eliminate the impact of the control pressure and "filter" the jitter of the control pressure, so that the balancing valve can open smoothly, solving the jitter problem of the balancing valve caused by load pressure or temperature changes.

[0030] The control pressure first controls the direction of the hydraulically controlled throttle valve 7, reducing its throttling area. This allows the control pressure of the balancing valve body 8 to be established more smoothly. The hydraulically controlled throttle valve 7 is a hydraulically controlled proportional throttle valve. As the control pressure increases, its throttling area gradually decreases; as the control pressure decreases, its throttling area gradually increases. The opening speed of the balancing valve body 8 can be adjusted by adjusting the orifices of the first and second dampers 2 and 3. Increasing the orifices of the first and / or second dampers 2 and 3 accelerates the opening time of the balancing valve body 8; conversely, reducing the orifices of the first and / or second dampers 2 and 3 prolongs the opening time of the balancing valve body 8. The opening speed of the hydraulically controlled throttle valve 7 can be adjusted by adjusting the orifices of the third, fourth, and fifth dampers 4 and 6. When the third damping 4, the fourth damping 5 and / or the damping hole of the fifth damping 6 are increased, the opening time of the hydraulically controlled throttle valve 7 can be accelerated; conversely, when the third damping 4, the fourth damping 5 and / or the damping hole of the fifth damping 6 are decreased, the opening time of the hydraulically controlled throttle valve 7 can be prolonged.

[0031] Example 2

[0032] A luffing hydraulic system mainly comprises a luffing oil cylinder and the balancing valve module in the above-mentioned embodiment 1, wherein the luffing oil cylinder is connected to the oil port B of the balancing valve module.

[0033] Example 3

[0034] A winch hydraulic system mainly comprises a winch motor and a balancing valve module according to one of the above embodiments, wherein the winch motor is connected to an oil port B of the balancing valve module.

[0035] Compared to existing technologies, the anti-vibration balancing valve module of the present invention controls the opening of the balancing valve body through a damping network composed of multiple oil circuits, eliminating the impact of the control pressure and "filtering" the vibration of the control pressure, allowing the balancing valve body to open smoothly, and solving the problem of vibration of the balancing valve body caused by load pressure or temperature changes. By controlling the throttling area of ​​the hydraulically controlled throttle valve, the pressure of the control oil circuit can be smoothly regulated. By designing the size of the damping holes of each damper, the opening time of the hydraulically controlled throttle valve and the opening time of the control balancing valve body can be controlled.

[0036] The above specific embodiments do not constitute a limitation on the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An anti-shake balancing valve module, characterized in that: It includes a balancing valve body, a damping network for controlling the opening of the balancing valve body, an oil control port K and an oil drain port L. The damping network includes a main oil circuit, a control oil circuit, a pressure stabilizing oil circuit and an oil drain oil circuit. The main oil circuit is led out from the oil control port K and is divided into two circuits. One circuit forms the control oil circuit and is connected to the control chamber of the balancing valve body, and the other circuit forms the drain oil circuit and is connected to the drain port L. The pressure stabilizing oil circuit is connected between the control oil circuit and the oil drain port L. A hydraulically controlled throttle valve is provided on the pressure-stabilizing oil circuit, and a control chamber of the hydraulically controlled throttle valve is connected to the oil drain circuit via a branch oil circuit; A second damper is provided on the control oil circuit, and the second damper is located between the connecting point of the pressure stabilizing oil circuit and the control oil circuit and the balancing valve body; A first damper is provided on the control oil circuit, and a connection point between the pressure stabilizing oil circuit and the control oil circuit is located between the first damper and the second damper; The oil drain line is provided with a third damper.

2. The anti-vibration balancing valve module according to claim 1, characterized in that: A fifth damper is provided on the oil drain line, and a connection point between the branch oil line and the oil drain line is located between the third damper and the fifth damper.

3. The anti-vibration balancing valve module according to claim 2, characterized in that: The branch oil circuit is provided with a fourth damper.

4. The anti-shake balancing valve module according to claim 1, characterized in that: A filter is provided on the main oil line.

5. The anti-shake balancing valve module according to claim 1, characterized in that: The module further includes an oil port A and an oil port B. When the balancing valve body is in an open state, the oil port B is connected to the oil port A.

6. A variable amplitude hydraulic system, characterized in that: The anti-shake balancing valve module comprises the anti-shake balancing valve module according to any one of claims 1 to 5.

7. A winch hydraulic system, characterized in that: The anti-shake balancing valve module comprises the anti-shake balancing valve module according to any one of claims 1 to 5.

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