Platform swing control system and movable lifting working platform

Abstract

The utility model discloses a platform swing control system and a movable type lifting working platform, and the platform swing control system comprises a rotary table control multi-way valve, a two-position six-way platform switching valve, a leveling hydraulic lock overflow valve, a lower leveling oil cylinder, a balance valve, an upper leveling oil cylinder, a crank arm oil cylinder, a swing oil cylinder and a platform secondary switching valve group, the platform secondary switching valve group is composed of two two-position two-way switching valves I and two constant flow valves I, and the two constant flow valves I are communicated with each other. According to the system, the two mutually communicated constant flow valves are arranged on the platform secondary switching valve group, when the swing oil cylinder works, the rotary table controls the multi-way valve to output high-flow high-pressure oil, rapid pressure building of the system can be achieved, one part of the high-pressure oil enters the swing oil cylinder, and the other part of the high-pressure oil achieves pressure relief through the constant flow valves; therefore, quick start and quick stop of the swing oil cylinder are realized, and the problem of start and stop delay is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a platform swing control system and a mobile lifting work platform. Background Art

[0002] Mobile lifting work platforms, also known as boom-type aerial work vehicles or boom-type lifting platforms, are mainly used in construction, steel structures, venues and leasing industries. When the vehicle is working, workers are generally located on the platform for operation and construction. There may be various obstacles near the platform, so the responsiveness and reliability of the platform action are very high. The traditional mobile lifting work platform has a small oil chamber in the platform swing cylinder. In order to control the platform swing speed, the hydraulic system input oil volume can only be reduced. At the same time, the turntable control multi-way valve is far away from the platform, the intermediate pipeline is long, and the pipeline content is large. Under low flow conditions, the system pressure builds slowly and the platform swing start response is delayed. At the same time, when the platform stops swinging, the system pressure relief is slow because the pipeline between the turntable control multi-way valve and the swing cylinder is long, resulting in a delay in the platform swing stop response. And the reset of the control platform switching valve before the pressure relief is completed will cause the platform amplitude change to malfunction. Utility Model Content

[0003] The utility model aims to provide a platform swing control system and a mobile lifting work platform to solve the problem of delayed response of the platform swing start and stop action caused by slow pressure building and pressure relief of the platform swing control system of the mobile lifting work platform.

[0004] To achieve the above-mentioned purpose, on the one hand, the utility model provides a platform swing control system, including a turntable control multi-way valve, a two-position six-way platform switching valve, a leveling hydraulic lock overflow valve, a lower leveling cylinder, a balancing valve, an upper leveling cylinder, a crank arm cylinder, a swing cylinder and a platform secondary switching valve group, wherein the balancing valve includes a balancing valve I, a balancing valve II and a balancing valve III, and the platform secondary switching valve group consists of two two-position two-way switching valves and two constant flow valves, and the two constant flow valves are connected to each other;

[0005] The A5 port of the turntable control multi-way valve is connected to the P1 port of the two-position six-way platform switching valve, and the B5 port of the turntable control multi-way valve is connected to the P2 port of the two-position six-way platform switching valve; the C2 port of the two-position six-way platform switching valve is connected to the V1 port of the leveling hydraulic lock relief valve, and the C3 port of the two-position six-way platform switching valve is connected to the V2 port of the leveling hydraulic lock relief valve; the C1 port of the leveling hydraulic lock relief valve enters the rodless chamber of the lower leveling cylinder one way, and is connected to the balance valve I one way; the C2 port of the leveling hydraulic lock relief valve enters the rod chamber of the lower leveling cylinder one way, and is connected to the balance valve one way; the balance valve I is connected to the upper leveling cylinder;

[0006] The C1 port of the two-position six-way platform switching valve is connected to the P1 port of the platform secondary switching valve group, and the C4 port of the two-position six-way platform switching valve is connected to the P2 port of the platform secondary switching valve group; the C1 port of the platform secondary switching valve is connected to the balancing valve II, the C2 port of the platform secondary switching valve is connected to the balancing valve III, the C3 port of the platform secondary switching valve is connected to the balancing valve III, and the C4 port of the platform secondary switching valve is connected to the balancing valve II; the balancing valve II is connected to the crankshaft cylinder, and the balancing valve III is connected to the swing cylinder.

[0007] As a further improvement of the utility model, the flow rate output by the turntable-controlled multi-way valve is greater than the set flow rate of the constant flow valve.

[0008] On the other hand, the utility model provides a mobile lifting work platform, including the platform swing control system described above.

[0009] The beneficial effects of the utility model are:

[0010] When the platform starts to swing, the system sets a constant flow valve bypass circuit to increase the system input flow, accelerate the startup pressure building, and reduce the start-up response delay of the platform swing action; when the mobile platform stops swinging, the system's oil inlet and oil return circuits are connected by adding a constant flow valve to quickly release pressure in the oil inlet, reduce the stop response delay of the platform swing action, and avoid the risk of false action of the boom amplitude change. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the principle diagram of the platform swing control system of the utility model;

[0012] In the figure, 1-turntable control multi-way valve; 2-two-position six-way platform switching valve; 3-leveling hydraulic lock overflow valve; 4-lower leveling cylinder; 5-balancing valve; 5-1-balancing valve I; 5-2-balancing valve II; 5-3-balancing valve III; 6-upper leveling cylinder; 7-boom cylinder; 8-swing cylinder; 9-platform secondary switching valve group. DETAILED DESCRIPTION

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] like Figure 1As shown, a platform swing control system includes a turntable control multi-way valve 1, a two-position six-way platform switching valve 2, a leveling hydraulic lock overflow valve 3, a lower leveling oil cylinder 4, a balance valve 5, an upper leveling oil cylinder 6, a crank cylinder 7, a swing oil cylinder 8 and a platform secondary switching valve group 9, wherein the balance valve 5 includes a balance valve I5-1, a balance valve II5-2 and a balance valve III5-3, and the platform secondary switching valve group 9 is composed of two two-position two-way switching valves I and two constant flow valves I, and the two constant flow valves I are connected to each other. The A5 port of the turntable control multi-way valve 1 is connected to the P1 port of the two-position six-way platform switching valve, and the B5 port of the turntable control multi-way valve 1 is connected to the P2 port of the two-position six-way platform switching valve. The C2 port of the two-position six-way platform switching valve 2 is connected to the V1 port of the leveling hydraulic lock overflow valve 3, and the C3 port of the two-position six-way platform switching valve 2 is connected to the V2 port of the leveling hydraulic lock overflow valve 3. The C1 port of the leveling hydraulic lock overflow valve 3 enters the rodless chamber of the lower leveling cylinder 4 on one side, and is connected to the balance valve I5-1 on the other side. The C2 port of the leveling hydraulic lock overflow valve 3 enters the rod chamber of the lower leveling cylinder 4, and is connected to the balance valve 5-1 on one side; the balance valve I5-1 is connected to the upper leveling cylinder 6; the C1 port of the two-position six-way platform switching valve 2 is connected to the P1 port of the platform secondary switching valve group 9, and the C4 port of the two-position six-way platform switching valve 2 is connected to the P2 port of the platform secondary switching valve group 9. The C1 port of the platform secondary switching valve 9 is connected to the balance valve II5-2, the C2 port of the platform secondary switching valve 9 is connected to the balance valve III5-3, the C3 port of the platform secondary switching valve 9 is connected to the balance valve III5-3, and the C4 port of the platform secondary switching valve 9 is connected to the balance valve II5-2. The balance valve II5-2 is connected to the crank arm cylinder 7, and the balance valve III5-3 is connected to the swing cylinder 8.

[0015] In the prior art, since the internal oil chamber of the swing cylinder is small, the swing flow required is small, only about 1L. In order to control the platform swing speed, the platform control working link output flow also needs to be about 1L. However, the pipeline between the platform control link and the swing cylinder is long. Under the condition of small flow restriction, the time required for the built-up pressure in the pipeline is long, resulting in a delay in the platform swing start response, which is measured to be about 4S. When the platform swing action stops, due to the high pressure of the platform swing action and the long pipeline between the platform control link and the swing cylinder, the system pressure relief is slow, and the platform swing stop response is delayed, which is measured to be about 3.5S. After the valve core of the two-position six-way platform switching valve 2-2 is reset, the hydraulic system is connected to the boom amplitude adjustment cylinder. If there is high pressure in the system, it will cause the boom amplitude adjustment to malfunction.

[0016] The working process of the swing cylinder 8 of the utility model is:

[0017] When the swing cylinder rotates clockwise, Y4a of the platform control working link in the turntable control multi-way valve 1 is energized, the solenoid valve works in the right position, the hydraulic oil enters the two-position six-way platform switching valve 2 through the A5 port, and then enters the reversing valve on the left side of the platform secondary switching valve 9 through the C1 port. At this time, Y12a is energized, and the hydraulic oil enters the swing cylinder 8 through the C2 port, pushing the swing cylinder to rotate clockwise; when the swing cylinder rotates counterclockwise, Y4b of the platform control working link in the turntable control multi-way valve 1 is energized, the solenoid valve works in the left position, the hydraulic oil enters the two-position six-way platform switching valve 2 through the B5 port, and then enters the switching valve on the right side of the platform secondary switching valve 9 through the C4 port. At this time, Y12b is energized, and the hydraulic oil enters the swing cylinder through the C3 port, pushing the swing cylinder to rotate counterclockwise. The constant flow valve sets the flow rate to 2L / min. When the platform swing starts, the turntable control multi-way valve 1 inputs a flow rate of 3L / min into the system to speed up the pressure building speed of the long pipeline. After the pressure is built up, the hydraulic oil beyond the flow required by the swing cylinder 8 to drive the platform to swing enters the return oil pipeline through the constant flow valve, and finally flows back to the hydraulic oil tank. The platform swing start response delay can be reduced from 4s to less than 1s.

[0018] The utility model also provides a mobile lifting work platform, which comprises the platform swing control system described above.

[0019] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A platform swing control system, characterized in that: The invention comprises a turntable control multi-way valve (1), a two-position six-way platform switching valve (2), a leveling hydraulic lock overflow valve (3), a lower leveling cylinder (4), a balancing valve (5), an upper leveling cylinder (6), a crank arm cylinder (7), a swing cylinder (8) and a platform secondary switching valve group (9), wherein the balancing valve (5) comprises a balancing valve I (5-1), a balancing valve II (5-2) and a balancing valve III (5-3), and the platform secondary switching valve group (9) comprises two two-position two-way switching valves and two constant flow valves, and the two constant flow valves are connected to each other; The A5 port of the turntable control multi-way valve (1) is connected to the P1 port of the two-position six-way platform switching valve, and the B5 port of the turntable control multi-way valve (1) is connected to the P2 port of the two-position six-way platform switching valve; the C2 port of the two-position six-way platform switching valve (2) is connected to the V1 port of the leveling hydraulic lock overflow valve (3), and the C3 port of the two-position six-way platform switching valve (2) is connected to the V2 port of the leveling hydraulic lock overflow valve (3); the C1 port of the leveling hydraulic lock overflow valve (3) enters the rodless chamber of the lower leveling cylinder (4) on one side, and is connected to the balance valve I (5-1) on the other side; the C2 port of the leveling hydraulic lock overflow valve (3) enters the rod chamber of the lower leveling cylinder (4) on one side, and is connected to the balance valve (5-1) on the other side; the balance valve I (5-1) is connected to the upper leveling cylinder (6); The C1 port of the two-position six-way platform switching valve (2) is connected to the P1 port of the platform secondary switching valve group (9), and the C4 port of the two-position six-way platform switching valve (2) is connected to the P2 port of the platform secondary switching valve group (9); the C1 port of the platform secondary switching valve (9) is connected to the balancing valve II (5-2), the C2 port of the platform secondary switching valve (9) is connected to the balancing valve III (5-3), the C3 port of the platform secondary switching valve (9) is connected to the balancing valve III (5-3), and the C4 port of the platform secondary switching valve (9) is connected to the balancing valve II (5-2); the balancing valve II (5-2) is connected to the crankshaft cylinder (7), and the balancing valve III (5-3) is connected to the swing cylinder (8).

2. The platform swing control system according to claim 1, characterized in that: The flow rate output by the turntable-controlled multi-way valve (1) is greater than the set flow rate of the constant flow valve.

3. A mobile lifting work platform, characterized in that: Including the platform swing control system described in claim 1 or 2.

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