Bidirectional hydraulic power unit of electrically-driven shear fork type aerial work platform

Abstract

The utility model relates to the technical field of shears-fork type aerial work platforms, in particular to a bidirectional hydraulic power unit of an electric drive shears-fork type aerial work platform, which comprises a direct current motor, a bidirectional gear pump is connected onto the direct current motor, and an oil supplementing one-way valve and a two-position six-way lifting reversing valve are connected onto the bidirectional gear pump. The two-position six-way lifting reversing valve is connected with a lifting oil cylinder and a two-position four-way steering reversing valve, the lifting oil cylinder is connected with a lifting overload valve, the two-position four-way steering reversing valve is connected with a steering oil cylinder and a shuttle valve, and a damping plug is arranged between the steering oil cylinder and the two-position four-way steering reversing valve. The shuttle valve is connected with a steering overload valve, the two-position six-way lifting reversing valve and the steering overload valve are both connected with an oil tank, and the oil tank connected with the two-position six-way lifting reversing valve is provided with an oil sucking and supplementing filter.

Description

Technical Field

[0001] The utility model relates to the technical field of scissor-type aerial work platforms, in particular to a bidirectional hydraulic power unit for an electric-driven scissor-type aerial work platform. Background Art

[0002] At present, in the special vehicles for electric-drive scissor-type aerial work platforms, one-way pumps and three-position four-way steering reversing valves are mainly used, which result in large energy losses during use.

[0003] Therefore, it is necessary to design a bidirectional hydraulic power unit for an electric-driven scissor-type aerial work platform to solve the problems in the above-mentioned background technology. Utility Model Content

[0004] The utility model aims to solve the problems in the prior art and proposes a bidirectional hydraulic power unit for an electric-driven scissor-type aerial work platform.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The bidirectional hydraulic power unit of an electric-driven scissor-type aerial work platform comprises a DC motor, the DC motor is connected to a bidirectional gear pump, the bidirectional gear pump is connected to an oil replenishment check valve and a two-position six-way lifting reversing valve, the two-position six-way lifting reversing valve is connected to a lifting cylinder and a two-position four-way steering reversing valve, the lifting cylinder is connected to a lifting overload valve, the two-position four-way steering reversing valve is connected to a steering cylinder and a shuttle valve, a damping plug is provided between the steering cylinder and the two-position four-way steering reversing valve, the shuttle valve is connected to a steering overload valve, the two-position six-way lifting reversing valve and the steering overload valve are both connected to an oil tank, and an oil suction and replenishment filter is provided on the oil tank connected to the two-position six-way lifting reversing valve.

[0007] As a preferred solution of the utility model, an external valve block directly connected to the oil tank is provided on the small cavity of the lifting cylinder.

[0008] As a preferred solution of the utility model, the bidirectional gear pump is provided with an A port and a B port.

[0009] As a preferred solution of the utility model, the DC motor is a DC motor that can rotate forward and reverse.

[0010] As a preferred solution of the utility model, the oil replenishment one-way valve is composed of a right oil replenishment one-way valve and a left oil replenishment one-way valve.

[0011] To sum up, the technical effects and advantages of the utility model are as follows: the two-way hydraulic power unit of the electric-driven scissor-type aerial work platform can achieve the basic functions through the two-way gear pump structure, and can achieve the function of energy recovery, reduce the workload of the two-way gear pump, improve the service life, and extend the service life of the battery. The DC motor is used as the power source, and the speed and direction of the DC motor are controlled by the controller. The two-way gear pump controls the left and right steering of the steering cylinder through forward and reverse rotation. The oil replenishment check valve is used for oil replenishment of the two-way gear pump, the lifting overload valve limits the lifting cylinder pressure, the two-position six-way lifting reversing valve is used to control the lifting action, the two-position four-way steering reversing valve is used to control the steering, the damping plug adjusts the flow rate during steering, the shuttle valve automatically selects the appropriate oil circuit according to the steering of the two-way gear pump, and the steering overload valve is used to limit the steering cylinder pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall structure diagram of the utility model.

[0013] In the figure: 1. DC motor; 2. Bidirectional gear pump; 3. Oil replenishment check valve; 4. Lifting overload valve; 5. Two-position six-way lifting reversing valve; 6. Lifting cylinder; 7. Two-position four-way steering reversing valve; 8. Damping plug; 9. Steering cylinder; 10. Shuttle valve; 11. Steering overload valve; 12. Oil suction and replenishment filter; 13. Oil tank. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0015] Reference Figure 1 The electric-driven scissor-type aerial work platform bidirectional hydraulic power unit includes a DC motor 1, a bidirectional gear pump 2 is connected to the DC motor 1, an oil replenishment check valve 3 and a two-position six-way lifting reversing valve 5 are connected to the bidirectional gear pump 2, a lifting cylinder 6 and a two-position four-way steering reversing valve 7 are connected to the two-position six-way lifting reversing valve 5, a lifting overload valve 4 is connected to the lifting cylinder 6, a steering cylinder 9 and a shuttle valve 10 are connected to the two-position four-way steering reversing valve 7, a damping plug 8 is provided between the steering cylinder 9 and the two-position four-way steering reversing valve 7, a steering overload valve 11 is connected to the shuttle valve 10, and an oil tank 13 is connected to the two-position six-way lifting reversing valve 5 and the steering overload valve 11, and an oil suction and replenishment filter 12 is provided on the oil tank 13 connected to the two-position six-way lifting reversing valve 5.

[0016] Reference Figure 1An external valve block directly connected to the oil tank 13 is provided on the small chamber of the lifting cylinder 6, and an A port and a B port are provided on the bidirectional gear pump 2. In addition to realizing the basic functions through the structure of the bidirectional gear pump 2, the energy recovery function can be achieved, thereby reducing the workload of the bidirectional gear pump 2.

[0017] Reference Figure 1 The DC motor 1 is a DC motor that can be rotated forward and reversely, and the oil replenishment check valve 3 is composed of a right oil replenishment check valve and a left oil replenishment check valve.

[0018] Working principle: The electric-driven scissor-type aerial work platform has a two-way hydraulic power unit, in which a DC motor 1 is used as a power source. The speed and direction of the DC motor 1 are controlled by a controller. The two-way gear pump 2 controls the left and right steering of the steering cylinder 9 by forward and reverse rotation. The oil replenishment check valve 3 is used to replenish the oil of the two-way gear pump 2. The lifting overload valve 4 limits the pressure of the lifting cylinder 6. The two-position six-way lifting reversing valve 5 is used to control the lifting action. The two-position four-way steering reversing valve 7 is used to control the steering. The damping plug 8 adjusts the flow rate during steering. The shuttle valve 10 automatically selects the appropriate oil circuit according to the steering of the two-way gear pump 2. The steering overload valve 11 is used to limit the steering pressure.

[0019] Lifting action: The electromagnet of the two-position six-way lifting reversing valve 5 is energized, pushing the slide valve to the right position. At this time, the DC motor 1 rotates forward, and the two-way gear pump 2B port opens to inhale from the right oil replenishment check valve 3 and outputs from the A port. The left oil replenishment check valve 3 is closed, and the hydraulic oil passes through the two-position six-way lifting reversing valve 5 into the large chamber of the lifting cylinder 6, and the small chamber directly passes through the external valve block to the oil tank 13. When the lifting set pressure is reached, the pressure is released through the lifting overload valve 4 to complete the lifting action;

[0020] Lowering action: The electromagnet of the two-position six-way lifting reversing valve 5 is de-energized, and the slide valve is reset to the left position under the action of the spring. The lifting cylinder 6 slowly falls down by its own weight. The speed is controlled by the external valve block. The oil in the large chamber returns to the oil tank 13 through the valve body, and the small chamber is replenished with oil from the oil tank 13 through the external valve block to complete the lowering action.

[0021] Left steering: The electromagnet of the two-position four-way steering reversing valve 7 is energized, pushing the slide valve to the left position. At this time, the DC motor 1 reverses, and the two-way gear pump 2A port mainly absorbs oil from the small cavity of the steering cylinder 9, and replenishes oil from the left oil replenishment check valve 3 to make up for the flow loss caused by the internal leakage of the gear pump and the valve, and outputs from the B port. The right oil replenishment check valve 3 is closed, and the hydraulic oil passes through the two-position six-way lifting reversing valve 5 to reach the two-position four-way steering reversing valve 7. The hydraulic oil pushes the steel ball in the shuttle valve 10 to the left, and slowly enters the large cavity of the steering cylinder 9 through the damping plug 8. The piston rod is pushed to the left, and the wheel turns to the right. When the steering pressure reaches the set pressure, the pressure is released through the steering overload valve 11 to complete the left steering action;

[0022] Right steering: The solenoid of the two-position four-way steering reversing valve 7 is energized, pushing the slide valve to the left position. At this time, the DC motor 1 rotates forward, and the two-way gear pump 2B port mainly absorbs oil from the large cavity of the steering cylinder 9, and replenishes oil from the right oil replenishment check valve 3 to make up for the flow loss caused by the internal leakage of the gear pump and the valve, and outputs from the A port. The left oil replenishment check valve 3 is closed, and the hydraulic oil passes through the two-position six-way lifting reversing valve 5 to reach the two-position four-way steering reversing valve 7. The hydraulic oil pushes the steel ball in the shuttle valve 10 to the right, and slowly enters the small cavity of the steering cylinder 9 through the damping plug 8. The piston rod is pushed to the right, and the wheel turns left. When the steering pressure reaches the set pressure, the pressure is released through the steering overload valve 11 to complete the right steering action.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional hydraulic power unit for an electric scissor-type aerial work platform, comprising a DC motor (1), characterized in that: The DC motor (1) is connected to a bidirectional gear pump (2), the bidirectional gear pump (2) is connected to an oil replenishment check valve (3) and a two-position six-way lifting reversing valve (5), the two-position six-way lifting reversing valve (5) is connected to a lifting cylinder (6) and a two-position four-way steering reversing valve (7), the lifting cylinder (6) is connected to a lifting overload valve (4), the two-position four-way steering reversing valve (7) is connected to a steering cylinder (9) and a shuttle valve (10), a damping plug (8) is provided between the steering cylinder (9) and the two-position four-way steering reversing valve (7), the shuttle valve (10) is connected to a steering overload valve (11), the two-position six-way lifting reversing valve (5) and the steering overload valve (11) are both connected to an oil tank (13), and an oil suction and replenishment filter (12) is provided on the oil tank (13) connected to the two-position six-way lifting reversing valve (5).

2. The bidirectional hydraulic power unit for an electric-driven scissor-type aerial work platform according to claim 1 is characterized in that: An external valve block directly connected to the oil tank (13) is provided on the small chamber of the lifting oil cylinder (6).

3. The bidirectional hydraulic power unit of the electric-driven scissor-type aerial work platform according to claim 1 is characterized in that: The bidirectional gear pump (2) is provided with an A port and a B port.

4. The bidirectional hydraulic power unit for an electric-driven scissor-type aerial work platform according to claim 1, characterized in that: The DC motor (1) is a DC motor that can rotate forward and reverse.

5. The bidirectional hydraulic power unit for an electric-driven scissor-type aerial work platform according to claim 1, characterized in that: The oil replenishment check valve (3) consists of a right-side oil replenishment check valve and a left-side oil replenishment check valve.

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