Aerial work platform and hydraulic walking system thereof

Abstract

The utility model discloses an aerial work platform and a hydraulic walking system thereof. The system comprises an electromagnetic valve, a first balance valve, a second balance valve, a low-pressure side shuttle valve, a one-way valve, a hydraulic control reversing valve, a first motor and a second motor. A second port and a third port of the electromagnetic valve are respectively communicated with a first port of the first balance valve and a first port of the second balance valve; a second port of the first balance valve is communicated with a first motor, a second port of the second balance valve is communicated with a second motor, and the first motor and the second motor are communicated with a hydraulic oil tank through a hydraulic control reversing valve; a second port and a third port of the electromagnetic valve are respectively communicated with a first port and a second port of the low-pressure side shuttle valve, or a second port of the first balance valve and a second port of the second balance valve are respectively communicated with the first port and the second port of the low-pressure side shuttle valve; and a third port of the low-pressure side shuttle valve is communicated with the first motor and the second motor through one-way valves. According to the utility model, the problems of motor pressure build-up and energy consumption increase caused by air suction and oil supplement are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic control technical field, especially relates to a high altitude operation platform and hydraulic walking system thereof. BACKGROUND

[0002] The walking oil circuit of the liquid-driven self-propelled scissor aerial work platform is generally gear pump oil outlet, and oil liquid reaches the cycloidal motor after passing through the forward and reverse switching electromagnetic valve and the walking balance valve. When walking at high speed, the two cycloidal motors are generally connected in series, and the oil liquid first flows through the first motor and then flows through the second motor. When walking in a straight line, the left and right wheels have the same speed, but when turning, the left and right wheels will have a speed difference because of the inner and outer wheels, which in turn causes the demand flow of the two motors to be different.

[0003] If the oil liquid first flows through the outer wheel and then flows through the inner wheel, the flow of the motor corresponding to the outer wheel will be greater than the flow of the motor corresponding to the inner wheel because the speed of the outer wheel is greater than the speed of the inner wheel. If the input flow of the motor corresponding to the inner wheel is greater than its demand flow, the inlet pressure of the motor corresponding to the inner wheel will be high, and long-term high pressure may affect the service life of the motor.

[0004] If the oil liquid first flows through the inner wheel and then flows through the outer wheel, the flow of the motor corresponding to the inner wheel will be less than the flow of the motor corresponding to the outer wheel because the speed of the inner wheel is less than the speed of the outer wheel. If the input flow of the motor corresponding to the outer wheel is less than its demand flow, the inlet of the motor corresponding to the outer wheel will be empty, the motor will have an abnormal sound when walking, and may cause the whole vehicle to vibrate, which seriously affects the operation experience. The mainstream solution to the above problems is to connect a one-way valve to the main oil return line at the inlet of the second motor through which the oil liquid flows. When the motor is empty, the inlet pressure of the motor will be less than the pressure on the main oil return line, the one-way valve will open, and part of the oil on the main oil return line will be supplied to the inlet of the second motor, avoiding the motor from being empty. Moreover, a one-way throttle valve is generally arranged on the main oil return line to increase the oil return back pressure, which can better supply oil to the second motor, but the increase of the oil return back pressure leads to the increase of the pump outlet pressure, which in turn leads to the increase of energy consumption. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a high altitude operation platform and hydraulic walking system thereof to solve the problem that the high pressure of the motor in the traditional system affects its service life and the problem that the increase of the oil return back pressure leads to the increase of energy consumption when supplying oil to the motor.

[0006] The utility model solves the above technical problems through the following technical scheme: a hydraulic walking system of a high altitude operation platform, comprising a power source, an electromagnetic valve, a first balance valve, a second balance valve, a low pressure side shuttle valve, a one-way valve, a hydraulic control reversing valve, a first motor and a second motor.

[0007] The outlet of the power source is communicated with the first port of the electromagnetic valve, the second port and the third port of the electromagnetic valve are communicated with the first port of the first balance valve and the first port of the second balance valve respectively, and the fourth port of the electromagnetic valve is communicated with the hydraulic oil tank; the second port of the first balance valve is communicated with the first motor, the second port of the second balance valve is communicated with the second motor, and the first motor and the second motor are further communicated with the hydraulic oil tank through the hydraulic control reversing valve;

[0008] The second port and the third port of the electromagnetic valve are further communicated with the first port and the second port of the low-pressure side shuttle valve respectively, or the second port of the first balance valve and the second port of the second balance valve are further communicated with the first port and the second port of the low-pressure side shuttle valve respectively; the third port of the low-pressure side shuttle valve is communicated with the first motor and the second motor through the one-way valve.

[0009] Further, the system further comprises a shuttle valve, the first port and the second port of the shuttle valve are communicated with the second port of the first balance valve and the second port of the second balance valve respectively, and the third port of the shuttle valve is communicated with the hydraulic control reversing valve.

[0010] Further, the first port and the fourth port of the electromagnetic valve are further provided with a relief valve.

[0011] Further, a filter is further provided at the oil return port of the hydraulic oil tank.

[0012] Further, the power source comprises a hydraulic pump and a prime mover for driving the hydraulic pump.

[0013] Based on the same concept, the utility model further provides a high-altitude operation platform, the high-altitude operation platform includes the hydraulic walking system as described above.

[0014] Beneficial effects

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses a hydraulic control reversing valve is communicated main oil return road and first motor and second motor, when first motor or second motor is pressed, hydraulic control reversing valve opens, and the partial flow of the import of first motor or second motor returns to main oil return road through hydraulic control reversing valve, and the pressure of first motor or second motor when being pressed is reduced to a certain extent, and the service life of motor is prolonged, and certain energy consumption can also be reduced.

[0017] The utility model discloses a low pressure side shuttle valve and one -way valve intercommunication series connection's first motor and second motor's inlet and outlet, when first motor or second motor inhale empty, one -way valve opens, realizes first motor or second motor's import oil supplement through low pressure side shuttle valve and one -way valve, need not add one -way throttle valve to increase back pressure on main oil return line, thus will not increase energy consumption, avoids energy consumption increase under the condition of solving inhale empty problem. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only one embodiment of the utility model, for ordinary skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0019] Figure 1 It is the principle diagram of a kind of hydraulic walking system of the utility model embodiment;

[0020] Figure 2 It is the principle diagram of two kinds of hydraulic walking system of the utility model embodiment two.

[0021] Figure legend explanation: 1-hydraulic oil tank, 2-hydraulic pump, 3-solenoid valve, 4-first balance valve, 5-second balance valve, 6-low pressure side shuttle valve, 7-one-way valve, 8-hydraulic control reversing valve, 9-first motor, 10-second motor, 11-overflow valve, 12-filter, 13-shuttle valve. DETAILED DESCRIPTION

[0022] The technical scheme in the utility model is described clearly and completely in combination with the drawings in the utility model embodiments, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by ordinary skilled in the art without making creative labor belong to the scope of the utility model protection.

[0023] Embodiment one

[0024] As Figure 1As shown, the hydraulic walking system of the aerial working platform provided by the embodiment of the utility model comprises a power source, an electromagnetic valve 3, a first balance valve 4, a second balance valve 5, a low-pressure side shuttle valve 6, a check valve 7, a hydraulic control reversing valve 8, a first motor 9 and a second motor 10; the outlet of the power source is communicated with the first port of the electromagnetic valve 3, the second port and the third port of the electromagnetic valve 3 are respectively communicated with the first port of the first balance valve 4 and the first port of the second balance valve 5, and the fourth port of the electromagnetic valve 3 is communicated with the hydraulic oil tank 1; the second port of the first balance valve 4 is communicated with the first motor 9, the second port of the second balance valve 5 is communicated with the second motor 10, and the first motor 9 and the second motor 10 are further communicated with the hydraulic oil tank 1 through the hydraulic control reversing valve 8; the second port of the first balance valve 4 and the second port of the second balance valve 5 are further respectively communicated with the first port and the second port of the low-pressure side shuttle valve 6, and the third port of the low-pressure side shuttle valve 6 is communicated with the first motor 9 and the second motor 10 through the check valve 7.

[0025] When walking forward, the power source outputs hydraulic oil, the oil enters the electromagnetic valve 3 through the first port of the electromagnetic valve 3, flows out from the third port of the electromagnetic valve 3 and sequentially flows through the second balance valve 5, the second motor 10, the first motor 9, the first balance valve 4, and then flows back to the electromagnetic valve 3 through the second port of the electromagnetic valve 3, and then returns to the hydraulic oil tank 1 through the main oil return path. When the first motor 9 appears to be suction, the inlet pressure of the first motor 9 will be less than the outlet pressure, the check valve 7 is opened, and the outlet oil of the first motor 9 enters the inlet of the first motor 9 through the low-pressure side shuttle valve 6 and the check valve 7 for oil supplement; when the first motor 9 appears to be pressure, the inlet pressure of the first motor 9 will be greater than the sum of the inlet pressure of the second motor 10 and the spring pre-pressure of the hydraulic control reversing valve 8, the hydraulic control reversing valve 8 is opened, and part of the flow of the inlet of the first motor 9 flows to the main oil return path through the hydraulic control reversing valve 8, thereby reducing the pressure.

[0026] When walking backward, the power source outputs hydraulic oil, the oil enters the electromagnetic valve 3 through the first port of the electromagnetic valve 3, flows out from the second port of the electromagnetic valve 3 and sequentially flows through the first balance valve 4, the first motor 9, the second motor 10, the second balance valve 5, and then flows back to the electromagnetic valve 3 through the third port of the electromagnetic valve 3, and then returns to the hydraulic oil tank 1 through the main oil return path. When the second motor 10 appears to be suction, the inlet pressure of the second motor 10 will be less than the outlet pressure, the check valve 7 is opened, and the outlet oil of the second motor 10 enters the inlet of the second motor 10 through the low-pressure side shuttle valve 6 and the check valve 7 for oil supplement; when the second motor 10 appears to be pressure, the inlet pressure of the second motor 10 will be greater than the sum of the inlet pressure of the first motor 9 and the spring pre-pressure of the hydraulic control reversing valve 8, the hydraulic control reversing valve 8 is opened, and part of the flow of the inlet of the second motor 10 flows to the main oil return path through the hydraulic control reversing valve 8, thereby reducing the pressure.

[0027] The first port and the second port of the low-pressure side shuttle valve 6 are connected to the first motor 9 and the second motor 10 in series, and the third port of the low-pressure side shuttle valve 6 is connected to the oil inlet of the second motor through a one-way valve 7 (when walking forward, the oil inlet of the second motor is the oil inlet of the first motor 9; when walking backward, the oil inlet of the second motor is the oil inlet of the second motor 10), so that the oil entering the low-pressure side shuttle valve 6 during walking is the oil just flowing out of the first motor 9 and the second motor 10 in series, and the oil has a certain back pressure as the oil has not passed through the balance valve and the electromagnetic valve 3, so that the one-way throttle valve on the main oil return line does not need to be arranged to increase the back pressure, and therefore the energy consumption is not increased.

[0028] The utility model discloses in the first motor 9 or the second motor 10 holds pressure, and part oil liquid is released, and the pressure is reduced to some extent when holding pressure, prolongs the motor service life, and the energy consumption is reduced, when the first motor 9 or the second motor 10 inhales, the oil liquid of corresponding motor export is directly supplemented to the import of corresponding motor, because the oil liquid of corresponding motor export has certain back pressure of oil return, so it is easier to supplement oil, and the operation experience is improved, simultaneously, because the oil liquid of corresponding motor export has certain back pressure of oil return originally, so that the one-way throttle valve on the main oil return line does not need to be arranged to increase the back pressure of oil return, and therefore the energy consumption is not increased.

[0029] Only when the import pressure of the first motor 9 or the second motor 10 is greater than the sum of the import pressure of the second motor 10 or the first motor 9 and the spring pre-pressure of the hydraulic control reversing valve 8, the hydraulic control reversing valve 8 is opened, and part of the oil is released to the oil tank, and under other conditions, the hydraulic control reversing valve 8 is in the closed state, and the normal walking is not affected.

[0030] In the specific embodiment of the utility model, the hydraulic walking system further includes a shuttle valve 13, the first port and the second port of the shuttle valve 13 are in communication with the second port of the first balance valve 4 and the second port of the second balance valve 5 respectively, and the third port of the shuttle valve 13 is in communication with the hydraulic control reversing valve 8. The pressure is further reduced through the shuttle valve 13, and the pressure holding problem is further improved.

[0031] In the specific embodiment of the utility model, the first port and the fourth port of the electromagnetic valve 3 are further provided with a relief valve 11.

[0032] In the specific embodiment of the utility model, the oil return port of the hydraulic oil tank 1 is further provided with a filter 12, and the impurities in the oil are filtered out.

[0033] In the specific embodiment of the utility model, the power source includes a hydraulic pump 2 and a prime mover for driving the hydraulic pump 2.

[0034] Embodiment Two

[0035] As Figure 2 shown, the hydraulic walking system of the aerial work platform provided by the embodiment of the utility model comprises a power source, an electromagnetic valve 3, a first balance valve 4, a second balance valve 5, a low-pressure side shuttle valve 6, a check valve 7, a hydraulic control reversing valve 8, a first motor 9 and a second motor 10; the outlet of the power source is communicated with the first port of the electromagnetic valve 3, the second port and the third port of the electromagnetic valve 3 are communicated with the first port of the first balance valve 4 and the first port of the second balance valve 5 respectively, and the fourth port of the electromagnetic valve 3 is communicated with the hydraulic oil tank 1; the second port of the first balance valve 4 is communicated with the first motor 9, the second port of the second balance valve 5 is communicated with the second motor 10, and the first motor 9 and the second motor 10 are further communicated with the hydraulic oil tank 1 through the hydraulic control reversing valve 8; the second port and the third port of the electromagnetic valve 3 are further communicated with the first port and the second port of the low-pressure side shuttle valve 6 respectively, and the third port of the low-pressure side shuttle valve 6 is communicated with the first motor 9 and the second motor 10 through the check valve 7.

[0036] When walking forward, the power source outputs hydraulic oil, the oil enters the electromagnetic valve 3 through the first port of the electromagnetic valve 3, flows out from the third port of the electromagnetic valve 3 and sequentially flows through the second balance valve 5, the second motor 10, the first motor 9, the first balance valve 4, and then flows back to the electromagnetic valve 3 through the second port of the electromagnetic valve 3, and then returns to the hydraulic oil tank 1 through the main oil return path. When the first motor 9 appears to be suction, the inlet pressure of the first motor 9 will be less than the outlet pressure, the check valve 7 is opened, the outlet oil of the first motor 9 enters the inlet of the first motor 9 through the first balance valve 4, the low-pressure side shuttle valve 6 and the check valve 7 for oil supplement; when the first motor 9 appears to be pressure, the inlet pressure of the first motor 9 will be greater than the sum of the inlet pressure of the second motor 10 and the spring pre-pressure of the hydraulic control reversing valve 8, the hydraulic control reversing valve 8 is opened, and part of the flow of the inlet of the first motor 9 flows to the main oil return path through the hydraulic control reversing valve 8, thereby reducing the pressure.

[0037] When walking backward, the power source outputs hydraulic oil, the oil enters the electromagnetic valve 3 through the first port of the electromagnetic valve 3, flows out from the second port of the electromagnetic valve 3 and sequentially flows through the first balance valve 4, the first motor 9, the second motor 10, the second balance valve 5, and then flows back to the electromagnetic valve 3 through the third port of the electromagnetic valve 3, and then returns to the hydraulic oil tank 1 through the main oil return path. When the second motor 10 appears to be suction, the inlet pressure of the second motor 10 will be less than the outlet pressure, the check valve 7 is opened, the outlet oil of the second motor 10 enters the inlet of the second motor 10 through the second balance valve 5, the low-pressure side shuttle valve 6 and the check valve 7 for oil supplement; when the second motor 10 appears to be pressure, the inlet pressure of the second motor 10 will be greater than the sum of the inlet pressure of the first motor 9 and the spring pre-pressure of the hydraulic control reversing valve 8, the hydraulic control reversing valve 8 is opened, and part of the flow of the inlet of the second motor 10 flows to the main oil return path through the hydraulic control reversing valve 8, thereby reducing the pressure.

[0038] The control oil of the hydraulic control reversing valve 8 is from the oil before the electromagnetic reversing valve and the oil of the series cavity of the first motor 9 and the second motor 10 respectively, and part of the oil can be discharged to the hydraulic oil tank 1 when the first motor 9 or the second motor 10 is pressure blocked, but the effect of reducing the pressure blocking pressure is poorer than that of the technical scheme of the first embodiment because the oil pressure before the electromagnetic valve 3 is higher. The first port and the second port of the low pressure side shuttle valve 6 are communicated with the outlets of the first balance valve 4 and the second balance valve 5 respectively, and the oil entering the low pressure side shuttle valve 6 is the oil flowing out of the first balance valve 4 or the second balance valve 5 at this time, but the oil pressure of the oil flowing out of the first balance valve 4 or the second balance valve 5 is higher than the oil pressure of the main oil return passage because the oil has not flowed through the electromagnetic valve 3, and the oil can be supplemented when the first motor 9 or the second motor 10 is suctioned, but the oil pressure is reduced after the oil flows through the first balance valve 4 or the second balance valve 5, and the oil supplementing effect can be poorer than that of the technical scheme of the first embodiment.

[0039] In the specific embodiment of the utility model, the hydraulic walking system further includes a shuttle valve 13, the first port and the second port of the shuttle valve 13 are communicated with the second port of the first balance valve 4 and the second port of the second balance valve 5 respectively, and the third port of the shuttle valve 13 is communicated with the hydraulic control reversing valve 8. The pressure is further reduced through the shuttle valve 13, and the pressure blocking problem is further improved.

[0040] In the specific embodiment of the utility model, the first port and the fourth port of the electromagnetic valve 3 are further provided with a relief valve 11.

[0041] In the specific embodiment of the utility model, the return port of the hydraulic oil tank 1 is further provided with a filter 12, and the impurities in the oil are filtered out.

[0042] In the specific embodiment of the utility model, the power source includes a hydraulic pump 2 and a prime mover for driving the hydraulic pump 2.

[0043] The above disclosed is only the specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of the change or modification within the technical range disclosed by the utility model, and all should be covered in the protection scope of the utility model.

Claims

1. A hydraulic travel system for an aerial work platform, characterized by, The system comprises a power source, a solenoid valve, a first balance valve, a second balance valve, a low-pressure shuttle valve, a check valve, a hydraulic control reversing valve, a first motor and a second motor; An outlet of the power source is communicated with a first port of the solenoid valve, a second port and a third port of the solenoid valve are communicated with a first port of the first balance valve and a first port of the second balance valve respectively, and a fourth port of the solenoid valve is communicated with a hydraulic oil tank; a second port of the first balance valve is communicated with the first motor, a second port of the second balance valve is communicated with the second motor, and the first motor and the second motor are further communicated with the hydraulic oil tank through the hydraulic control reversing valve; The second port and the third port of the solenoid valve are further communicated with a first port and a second port of the low-pressure shuttle valve respectively, or the second port of the first balance valve and the second port of the second balance valve are further communicated with the first port and the second port of the low-pressure shuttle valve respectively; a third port of the low-pressure shuttle valve is communicated with the first motor and the second motor through the check valve.

2. The hydraulic travel system of a high-altitude work platform according to claim 1, characterized in that, The system further comprises a shuttle valve, a first port and a second port of the shuttle valve are communicated with the second port of the first balance valve and the second port of the second balance valve respectively, and a third port of the shuttle valve is communicated with the hydraulic control reversing valve.

3. The hydraulic travel system of a high-altitude work platform according to claim 1, characterized in that, An overflow valve is further arranged between the first port and the fourth port of the solenoid valve.

4. The hydraulic travel system of a high-altitude work platform according to claim 1, characterized in that, A filter is further arranged at an oil return port of the hydraulic oil tank.

5. The hydraulic travel system of a high-altitude work platform according to any one of claims 1 to 4, characterized in that, The power source comprises a hydraulic pump and a prime mover for driving the hydraulic pump.

6. An aerial work platform, characterized by The aerial work platform comprises the hydraulic walking system according to any one of claims 1-5.

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