Luffing landing leg walking integrated valve group

Abstract

Two working oil ports of a variable-amplitude supporting leg control valve are connected with an input port of a third shuttle valve, two working oil ports of a motor walking control valve are connected with an input port of a first shuttle valve, and output ports of the third shuttle valve and a second shuttle valve are connected with an input port of the second shuttle valve. And an output port of the second shuttle valve is connected with a pilot cavity of the hydraulic control reversing valve. Through the arrangement of the shuttle valve, oil pressure is input into the speed reducer brake when the variable-amplitude supporting leg is folded and unfolded, unlocking of the speed reducer brake on the walking wheel can be achieved, meanwhile, when the variable-amplitude supporting leg is folded and unfolded, two cavities of the walking motor are communicated through the oil passage, sliding friction between the walking wheel and the ground is prevented, the walking wheel and the ground are protected, and the service life of the walking wheel is prolonged. The service life is prolonged; the hydraulic system is completely adopted for control instead of electric signal control, the problems that the system is complex and faults are difficult to remove due to electric signal control are solved, and normal operation can still be achieved under the condition that no power source exists.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge inspection vehicles, in particular to a variable-amplitude outrigger walking integrated valve group. BACKGROUND

[0002] The bridge inspection vehicle is a working device that can provide a working platform for bridge inspection personnel during the inspection process. At present, the variable-amplitude outrigger walking mode is often used when the bridge inspection vehicle is working at low speed. In order to reduce the damage of the variable-amplitude outrigger to the road, an electromagnetic reversing valve is added in the walking control valve, and the switching of the electromagnetic reversing valve is controlled when the variable-amplitude outrigger is raised or retracted, so as to unlock the walking wheel. This mode needs to control the electromagnetic reversing valve through an electric signal to realize the switching during normal operation and release of the brake. The system is complex, and the troubleshooting is cumbersome. Moreover, the function cannot normally operate without electricity. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a variable-amplitude outrigger walking integrated valve group, which is provided to overcome the defects of the prior art. The shuttle valve is used to control the hydraulic control reversing valve, so that the walking wheel is unlocked through the oil pressure of the outrigger oil circuit when the variable-amplitude outrigger is raised or retracted, thereby reducing the friction between the walking wheel and the ground and achieving the purpose of protecting the walking wheel.

[0004] According to the variable-amplitude outrigger walking integrated valve group, the walking integrated valve group, the variable-amplitude outrigger control valve, the outrigger oil cylinder, the speed reducer brake and the walking motor are connected.

[0005] The walking integrated valve group includes a hydraulic control reversing valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, a balance valve and a motor walking control valve.

[0006] The first shuttle valve, the second shuttle valve and the third shuttle valve are each provided with two input ports and one output port.

[0007] The variable-amplitude outrigger control valve and the motor walking control valve are each provided with two working oil ports.

[0008] One of the working oil ports of the variable-amplitude outrigger control valve is connected with the rod cavity of the outrigger oil cylinder, and the other working oil port is connected with the rodless cavity of the outrigger oil cylinder. The two input ports of the third shuttle valve are connected between the two working oil ports of the variable-amplitude outrigger control valve. The extension and retraction of the outrigger oil cylinder are controlled by operating the variable-amplitude outrigger control valve, and the raising or retraction of the outrigger is controlled.

[0009] One of the working oil ports of the motor travel control valve is connected with an oil inlet cavity of the travel motor, and the other working oil port is connected with an oil outlet cavity of the travel motor, two input ports of the third shuttle valve are connected between two working oil ports of the luffing boom control valve, and the rotating direction of the travel motor is controlled by operating the motor travel control valve;

[0010] One end of the hydraulic control reversing valve is connected with one of the working oil ports of the motor travel control valve, and the other end is connected with the other working oil port of the motor travel control valve; the output port of the second shuttle valve is connected with the hydraulic control reversing valve, and the opening and closing of the hydraulic control reversing valve is controlled;

[0011] The output ports of the first shuttle valve and the third shuttle valve are connected with the input ports of the second shuttle valve, the output port of the third shuttle valve is connected with the reduction brake, and the reduction brake is arranged on the travel motor.

[0012] In one of the embodiments, the initial position of the hydraulic control reversing valve is bidirectional cut-off, and the reversing position is bidirectional conduction.

[0013] In one of the embodiments, the motor travel control valve is connected with the oil return port through a balance valve.

[0014] Further, the balance valve comprises a first check valve, a second check valve, a third check valve, a fourth check valve, a first sequence valve and a second sequence valve, wherein:

[0015] The first sequence valve and the second sequence valve are each provided with an input end, an output end and a pilot cavity;

[0016] The second check valve is connected between the input end of the first sequence valve and one of the working oil ports of the motor travel control valve, the third check valve is connected between the input end of the second sequence valve and the other working oil port of the motor travel control valve, and the output ends of the first sequence valve and the second sequence valve are connected with the oil return port;

[0017] The pilot cavity of the first sequence valve is connected with the third check valve, and the pilot cavity of the second sequence valve is connected with the second check valve;

[0018] The first sequence valve is connected in parallel with the first check valve, and the second sequence valve is connected in parallel with the fourth check valve.

[0019] Further, the set pressure of the first sequence valve and the second sequence valve is higher than the output pressure of the motor travel control valve.

[0020] In one of the embodiments, the walking motors include first and second walking motors, the reduction mechanism brakes include first and second reduction mechanism brakes, the first reduction mechanism brake is arranged at the first walking motor, and the second reduction mechanism brake is arranged at the second walking motor.

[0021] Further, the first and second reduction mechanism brakes are connected with an oil outlet.

[0022] In one of the embodiments, the outrigger oil cylinders include front and rear outrigger oil cylinders.

[0023] Further, first and second bidirectional hydraulic locks are further included, the rod cavity and the rodless cavity of the front outrigger oil cylinder are connected with the luffing outrigger control valve through the first bidirectional hydraulic lock, and the rod cavity and the rodless cavity of the rear outrigger oil cylinder are connected with the luffing outrigger control valve through the second bidirectional hydraulic lock.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] (1) The output ports of the first shuttle valve and the third shuttle valve are connected with the input port of the second shuttle valve, the output port of the third shuttle valve is connected with the reduction mechanism brake, oil pressure is input into the reduction mechanism brake when the luffing outrigger is retracted and extended, the reduction mechanism brake can be unlocked to the walking wheel, the two cavities of the walking motor are connected through the oil passage when the luffing outrigger is retracted and extended, the sliding friction between the walking wheel and the ground is prevented, the walking wheel and the ground are protected, and the service life is prolonged.

[0026] (2) The application does not adopt electric signal control but adopts hydraulic system control completely, the problem that the system is complicated and it is difficult to remove faults caused by electric signal control is avoided, and the hydraulic system can still operate normally without power supply. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a hydraulic control system schematic diagram of the utility model.

[0028] In the figure: 1, walking integrated valve group; 1-1, hydraulic control reversing valve; 1-2-1, first check valve; 1-2-2, second check valve; 1-2-3, third check valve; 1-2-4, fourth check valve; 1-3-1, first sequence valve; 1-3-2, second sequence valve; 1-4-1, first shuttle valve; 1-4-2, second shuttle valve; 1-4-3, third shuttle valve; 2-1, motor walking reversing valve; 2-2, variable amplitude support leg multi-way valve; 3-1, first bidirectional hydraulic lock; 3-2, second bidirectional hydraulic lock; 4-1, front support leg oil cylinder; 4-2, rear support leg oil cylinder; 5-1, first reduction gear brake; 5-2, second reduction gear brake; 6-1, first walking motor; 6-2, second walking motor. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0030] In addition, if these terms "first", "second" appear, these terms are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be noted that when a member is referred to as being "connected", it is not only directly connected, but can also be indirectly connected via an intervening member. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar terms as used herein are merely used for the purpose of illustration and are not intended to be limiting.

[0033] Referring to Figure 1 , Figure 1 The hydraulic control system schematic diagram in the embodiment of the present application is shown, and the variable-amplitude outrigger walking integrated valve group provided by the embodiment of the present application comprises a walking integrated valve group 1, a variable-amplitude outrigger control valve 2-2, an outrigger oil cylinder, a speed reducer brake and a walking motor, wherein:

[0034] The walking integrated valve group 1 comprises a hydraulic control reversing valve 1-1, a first shuttle valve 1-4-1, a second shuttle valve 1-4-2, a third shuttle valve 1-4-3, a balance valve and a motor walking control valve 2-1;

[0035] The first shuttle valve 1-4-1, the second shuttle valve 1-4-2 and the third shuttle valve 1-4-3 are each provided with two input ports and one output port;

[0036] The variable-amplitude outrigger control valve 2-2 and the motor walking control valve 2-1 are each provided with two working oil ports;

[0037] One of the working oil ports of the variable-amplitude outrigger control valve 2-2 is connected with the rod cavity of the outrigger oil cylinder, and the other working oil port is connected with the rodless cavity of the outrigger oil cylinder, the two working oil ports of the variable-amplitude outrigger control valve 2-2 are connected through the third shuttle valve 1-4-3, and the extension and retraction of the outrigger oil cylinder are controlled by operating the variable-amplitude outrigger control valve 2-2, so as to control the lifting or retraction of the outrigger;

[0038] One of the working oil ports of the motor walking control valve 2-1 is connected with the oil inlet cavity of the walking motor, and the other working oil port is connected with the oil outlet cavity of the walking motor, the two input ports of the third shuttle valve 1-4-3 are connected between the two working oil ports of the motor walking control valve 2-1, and the rotating direction of the walking motor is controlled by operating the motor walking control valve 2-1;

[0039] One end of the hydraulic control reversing valve 1-1 is connected with one of the working oil ports of the motor walking control valve 2-1, and the other end is connected with the other working oil port of the motor walking control valve 2-1; the output port of the second shuttle valve 1-4-2 is connected with the hydraulic control reversing valve 1-1, and the opening and closing of the hydraulic control reversing valve 1-1 is controlled;

[0040] The output port of the first shuttle valve 1-4-1 and the third shuttle valve 1-4-3 are connected with the input port of the second shuttle valve 1-4-2, and the output port of the third shuttle valve 1-4-3 is connected with the retarder brake, which is arranged on the travel motor.

[0041] In this embodiment, the initial position of the hydraulic control reversing valve 1-1 is bidirectional cut-off, and the reversing position is bidirectional conduction.

[0042] In this embodiment, the motor travel control valve 2-1 is connected with the oil return port through a balance valve.

[0043] Preferably, the balance valve comprises a first check valve 1-2-1, a second check valve 1-2-2, a third check valve 1-2-3, a fourth check valve 1-2-4, a first sequence valve 1-3-1 and a second sequence valve 1-3-2, wherein:

[0044] The first sequence valve 1-3-1 and the second sequence valve 1-3-2 are each provided with an input end, an output end and a pilot cavity;

[0045] The second check valve 1-2-2 is connected between the input end of the first sequence valve 1-3-1 and one of the working oil ports of the motor travel control valve 2-1, the third check valve 1-2-3 is connected between the input end of the second sequence valve 1-3-2 and the other working oil port of the motor travel control valve 2-1, and the output ends of the first sequence valve 1-3-1 and the second sequence valve 1-3-2 are connected with the oil return port;

[0046] The pilot cavity of the first sequence valve 1-3-1 is connected with the third check valve 1-2-3, and the pilot cavity of the second sequence valve 1-3-2 is connected with the second check valve 1-2-2;

[0047] The first sequence valve 1-3-1 is connected in parallel with the first check valve 1-2-1, and the second sequence valve 1-3-2 is connected in parallel with the fourth check valve 1-2-4.

[0048] Preferably, the set pressure of the first sequence valve 1-3-1 and the second sequence valve 1-3-2 is higher than the output pressure of the motor travel control valve 2-1.

[0049] In this embodiment, the travel motor comprises a first travel motor 6-1 and a second travel motor 6-2, and the retarder brake comprises a first retarder brake 5-1 and a second retarder brake 5-2, wherein the first retarder brake 5-1 is arranged on the first travel motor 6-1, and the second retarder brake 5-2 is arranged on the second travel motor 6-2.

[0050] Preferably, the first reduction mechanism brake 5-1 and the second reduction mechanism brake 5-2 are connected with the oil outlet.

[0051] In this embodiment, the outrigger oil cylinders include a front outrigger oil cylinder 4-1 and a rear outrigger oil cylinder 4-2.

[0052] Preferably, a first bidirectional hydraulic lock 3-1 and a second bidirectional hydraulic lock 3-2 are further included, the rod cavity and the rodless cavity of the front outrigger oil cylinder 4-1 are connected with the luffing outrigger control valve 2-2 through the first bidirectional hydraulic lock 3-1, and the rod cavity and the rodless cavity of the rear outrigger oil cylinder 4-2 are connected with the luffing outrigger control valve 2-2 through the second bidirectional hydraulic lock 3-2.

[0053] When the bridge detection vehicle is working, the luffing outrigger is raised, the luffing outrigger control valve 2-2 is switched to the left position first, the pressure oil enters the rodless cavities of the front outrigger oil cylinder 4-1 and the rear outrigger oil cylinder 4-2 through the first bidirectional hydraulic lock 3-1 and the second bidirectional hydraulic lock 3-2, and the vehicle frame of the bridge detection vehicle is raised. At the same time, the high-pressure oil enters the walking integrated valve group 1, enters the control port of the hydraulic control reversing valve 1-1 through the third shuttle valve 1-4-3, and the two cavities of the first walking motor 6-1 and the second walking motor 6-2 are communicated; at the same time, the pressure oil enters the brake oil ports of the first walking reduction mechanism brake 5-1 and the second walking reduction mechanism brake 5-2 from the walking integrated valve group 1 through the second shuttle valve 1-4-2, and the brakes are released. At this time, the walking wheels are free to rotate and reduce the friction with the ground. When the luffing outrigger is raised to the position, the luffing outrigger control valve 2-2 returns to the center position, the hydraulic control reversing valve 1-1 returns to the initial position, and the first walking reduction mechanism brake 5-1 and the second walking reduction mechanism brake 5-2 restore the brake.

[0054] When the bridge detection vehicle is working, the luffing outrigger is raised, the luffing outrigger control valve 2-2 is switched to the left position first, the pressure oil enters the rodless cavities of the front outrigger oil cylinder 4-1 and the rear outrigger oil cylinder 4-2 through the first bidirectional hydraulic lock 3-1 and the second bidirectional hydraulic lock 3-2, and the vehicle frame of the bridge detection vehicle is raised. At the same time, the high-pressure oil enters the walking integrated valve group 1, enters the control port of the hydraulic control reversing valve 1-1 through the third shuttle valve 1-4-3, and the two cavities of the first walking motor 6-1 and the second walking motor 6-2 are communicated; at the same time, the pressure oil enters the brake oil ports of the first walking reduction mechanism brake 5-1 and the second walking reduction mechanism brake 5-2 from the walking integrated valve group 1 through the second shuttle valve 1-4-2, and the brakes are released. At this time, the walking wheels are free to rotate and reduce the friction with the ground. When the luffing outrigger is raised to the position, the luffing outrigger control valve 2-2 returns to the center position, the hydraulic control reversing valve 1-1 returns to the initial position, and the first walking reduction mechanism brake 5-1 and the second walking reduction mechanism brake 5-2 restore the brake.

[0055] When the variable amplitude support leg is not working, the motor walking control valve 2-1 is reversed to the left position, the oil enters the first sequence valve 1-3-1, the first walking motor 6-1 and the second walking motor 6-2 from the walking integrated valve group 1 through the second one-way valve 1-2-2, the first one-way valve 1-2-1 is reversed, the oil circuit is not passed, the first sequence valve 1-3-1 is set to be higher than the walking working pressure, the oil circuit is not passed; at the same time, the oil pressure acts on the pilot cavity of the second sequence valve 1-3-2, the pressure rises, the sequence valve opens; at the same time, the oil pressure enters the first walking reducer brake 5-1 and the second walking reducer brake 5-2 through the first shuttle valve 1-4-1 and the second shuttle valve 1-4-2. The motor drives the reducer to walk forward, the motor oil flows out, the third one-way valve 1-2-3 and the fourth one-way valve 1-2-4 are reversed, the oil circuit is not passed, flows out through the open oil channel of the second sequence valve 1-3-2, the left side of the first one-way valve 1-2-1 is high pressure and cannot be opened, and the oil flows back to the oil tank through the oil return port.

[0056] When the variable amplitude support leg is not working, the motor walking control valve 2-1 is reversed to the right position, the oil enters the second sequence valve 1-3-2, the first walking motor 6-1 and the second walking motor 6-2 from the walking integrated valve group 1 through the third one-way valve 1-2-3, the fourth one-way valve 1-2-4 is reversed, the oil circuit is not passed, the second sequence valve 1-3-2 is set to be higher than the walking working pressure, the oil circuit is not passed; at the same time, the oil pressure acts on the pilot cavity of the first sequence valve 1-3-1, the pressure rises, the sequence valve opens; at the same time, the oil pressure enters the first walking reducer brake 5-1 and the second walking reducer brake 5-2 through the first shuttle valve 1-4-1 and the second shuttle valve 1-4-2. The motor drives the reducer to walk backward, the motor oil flows out, the second one-way valve 1-2-2 and the first one-way valve 1-2-1 are reversed, the oil circuit is not passed, flows out through the open oil channel of the first sequence valve 1-3-1, the right side of the fourth one-way valve 1-2-4 is high pressure and cannot be opened, and the oil flows back to the oil tank through the oil return port.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0058] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A variable amplitude outrigger walk integrated valve block, characterized by, The walking integrated valve group, the amplitude control valve, the outrigger cylinder, the brake of the speed reducer and the walking motor are included, wherein: The walking integrated valve group includes a hydraulic control reversing valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, a balance valve and a motor walking control valve; The first shuttle valve, the second shuttle valve and the third shuttle valve are each provided with two input ports and one output port; The amplitude control valve and the motor walking control valve are each provided with two working oil ports; One of the working oil ports of the amplitude control valve is connected with the rod cavity of the outrigger cylinder, the other working oil port is connected with the rodless cavity of the outrigger cylinder, the two input ports of the third shuttle valve are connected between the two working oil ports of the amplitude control valve, the extension and retraction of the outrigger cylinder are controlled by operating the amplitude control valve, and the lifting or retraction of the outrigger is controlled; One of the working oil ports of the motor walking control valve is connected with the oil inlet cavity of the walking motor, the other working oil port is connected with the oil outlet cavity of the walking motor, the two input ports of the third shuttle valve are connected between the two working oil ports of the amplitude control valve, and the rotating direction of the walking motor is controlled by operating the motor walking control valve; One end of the hydraulic control reversing valve is connected with one of the working oil ports of the motor walking control valve, the other end is connected with the other working oil port of the motor walking control valve; the output port of the second shuttle valve is connected with the hydraulic control reversing valve, and the opening and closing of the hydraulic control reversing valve is controlled; The output ports of the first shuttle valve and the third shuttle valve are connected with the input ports of the second shuttle valve, the output port of the third shuttle valve is connected with the brake of the speed reducer, and the brake of the speed reducer is arranged in the walking motor.

2. The variable amplitude outrigger walk integrated valve block of claim 1, wherein, The initial position of the hydraulic control reversing valve is bidirectional cut-off, and the reversing position is bidirectional conduction.

3. The variable amplitude outrigger walk integrated valve block of claim 1, wherein, The balance valve is further included, and the motor walking control valve is connected with the oil return port through the balance valve.

4. A variable amplitude outrigger walk integrated valve set according to claim 3, wherein, The balance valve includes a first check valve, a second check valve, a third check valve, a fourth check valve, a first sequence valve and a second sequence valve, wherein: The first sequence valve and the second sequence valve are each provided with an input end, an output end and a pilot cavity; The second check valve is connected between the input end of the first sequence valve and one of the working oil ports of the motor walking control valve, the third check valve is connected between the input end of the second sequence valve and the other working oil port of the motor walking control valve, and the output ends of the first sequence valve and the second sequence valve are connected with the oil return port; The pilot cavity of the first sequence valve is connected with the third check valve, and the pilot cavity of the second sequence valve is connected with the second check valve; The first sequence valve is connected with the first check valve in parallel, and the second sequence valve is connected with the fourth check valve in parallel.

5. A variable amplitude outrigger walk integrated valve pack according to claim 4, wherein, The set pressure of the first sequence valve and the second sequence valve is higher than the output pressure of the motor walking control valve.

6. The variable amplitude outrigger walk integrated valve block of claim 1, wherein, The walking motor includes a first walking motor and a second walking motor, the brake of the speed reducer includes a first brake of the speed reducer and a second brake of the speed reducer, the first brake of the speed reducer is arranged in the first walking motor, and the second brake of the speed reducer is arranged in the second walking motor.

7. A variable amplitude outrigger walk integrated valve pack according to claim 6, wherein, The first and second speed reduction mechanism brakes are connected with the oil outlet.

8. The variable amplitude outrigger walk integrated valve block of claim 1, wherein, The outrigger oil cylinders include front outrigger oil cylinders and rear outrigger oil cylinders.

9. A variable amplitude outrigger walk integrated valve pack according to claim 8, wherein, First and second bidirectional hydraulic locks are further included, the rod cavity and the rodless cavity of the front outrigger oil cylinders are connected with the luffing outrigger control valve through the first bidirectional hydraulic lock, and the rod cavity and the rodless cavity of the rear outrigger oil cylinders are connected with the luffing outrigger control valve through the second bidirectional hydraulic lock.

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