Hydraulic power unit of lifting platform

Abstract

The utility model belongs to the technical field of hydraulic control, and particularly relates to a hydraulic power unit of a lifting platform, which comprises a motor, a hydraulic gear pump, an oil tank, an oil path block, a two-position four-way valve, a three-position four-way valve, two overflow valves, a first oil pipe, a second oil pipe and a third oil pipe. The first oil pipe is connected with the hydraulic gear pump and communicated with the oil path block, the second oil pipe and the third oil pipe are both fixed to the oil path block and communicated with the oil path block, the two-position four-way valve, the three-position four-way valve and the overflow valve are all detachably connected with the oil path block, the motor is fixed to the oil path block, and the output end of the motor is connected with the hydraulic gear pump; compared with the prior art, the two-position four-way valve, the three-position four-way valve and the two overflow valves are matched with the oil path block to realize the control valve control throttling overflow system, so that the efficiency of a hydraulic power unit is greatly improved, the energy-saving effect is also remarkably improved, and the impact noise caused by the hydraulic power unit is also greatly reduced.

Description

Technical Field

[0001] The utility model relates to a hydraulic control technology, and more specifically, to a hydraulic power unit of a lifting platform. Background Art

[0002] The hydraulic power unit of the lifting platform is an assembly unit used in hydraulic lifting. Its main function is to control the lifting platform to rise and fall. The hydraulic power unit of the lifting platform belongs to an assembly unit of the lifting system, usually composed of a motor, a hydraulic pump, an oil tank and a control valve. When the hydraulic power unit of the lifting platform is in operation, the motor needs to drive the hydraulic pump, and the oil circuit is controlled by the integrated control valve group to drive the lifting platform to work.

[0003] The hydraulic power units of lifting platforms commonly used in the market are large in size, high in energy consumption, and low in power conversion efficiency. In the hydraulic circuit of the hydraulic cylinder, the matching relationship between the actuator speed and the output flow of the power source is achieved through the volume adjustment of the throttle valve or the pump, which can meet basic practical requirements; however, the throttling speed control system has low efficiency, high system noise, and large size; the pump volume speed control system has a complex structure, high requirements for oil, and large motor idling losses. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a hydraulic power unit for a lifting platform that solves the above-mentioned technical problems.

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

[0006] A hydraulic power unit for a lifting platform includes a motor, a hydraulic gear pump, an oil tank, an oil block, a two-position four-way valve, a three-position four-way valve, two overflow valves, a first oil pipe, a second oil pipe and a third oil pipe.

[0007] The motor and the hydraulic gear pump are both fixed on the oil block, the output end of the motor is connected to the hydraulic gear pump, the first oil pipe is connected to the hydraulic gear pump and communicates with the oil block, the second oil pipe and the third oil pipe are both fixed on the oil block and communicate with the oil block,

[0008] The two-position four-way valve, three-position four-way valve and two relief valves are all fixed on the oil block and connected to the oil circuit in the oil block.

[0009] The oil tank is disassembled and connected with the oil circuit block, and the hydraulic gear pump, the oil tank, the oil circuit block, the two-position four-way valve, the three-position four-way valve, two overflow valves, the first oil pipe, the second oil pipe and the third oil pipe are all extended into the oil tank.

[0010] Furthermore, the hydraulic power unit includes a main oil circuit, an ascending oil circuit, a descending oil circuit, a return oil circuit and a spare oil circuit. The main oil circuit is composed of a first oil pipe, an oil circuit block and a two-position four-way valve. The ascending oil circuit and the descending oil circuit are composed of a second oil pipe, an oil circuit block, a two-position four-way valve and a three-position four-way valve. The return oil circuit is composed of a third oil pipe, an oil circuit block and an overflow valve. The spare oil circuit is composed of a second oil pipe, an oil circuit block, a two-position four-way valve and another overflow valve.

[0011] Furthermore, the oil tank includes a box body, a box neck and an annular baffle connected in sequence, the annular baffle is provided with a connecting hole, the oil circuit block includes a main body block and a protruding block, the hydraulic gear pump is fixed on the protruding block, the motor is fixed on the main body block, the second oil pipe and the third oil pipe are both fixed on the main body block, the main body block is provided with a threaded hole, the protruding block can extend into the box neck, the annular baffle is in conflict with the main body block, and the connecting hole corresponds to the threaded hole.

[0012] Furthermore, a clamp is sleeved on the box neck, and the clamp is used to fix the box neck and the protruding block.

[0013] Furthermore, a sealing ring cooperating with the box neck is provided on the raised block.

[0014] Furthermore, the two-position four-way valve, the three-position four-way valve and the overflow valve are all detachably connected to the oil circuit block.

[0015] Furthermore, an oil suction filter is fixed on the end of the first oil pipe.

[0016] By adopting the above technical solution, the beneficial effects of the utility model are:

[0017] 1. The control valve controlled throttling overflow system realized by a two-position four-way valve, a three-position four-way valve and two overflow valves in conjunction with the oil circuit block greatly improves the efficiency of the hydraulic power unit, significantly improves the energy saving effect, and greatly reduces the impact noise caused.

[0018] 2. Simple structure, lightweight product, easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the hydraulic power unit of an embodiment of the utility model.

[0020] Figure 2 It is a front view structural schematic diagram of the hydraulic power unit.

[0021] Figure 3 It is a schematic diagram of the partial structure of the hydraulic power unit.

[0022] Figure 4 Schematic diagram of the oil flow of the hydraulic power unit. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] The hydraulic power unit includes a motor 1, a hydraulic gear pump 2, an oil tank 3, an oil circuit block 4, a two-position four-way valve 5, a three-position four-way valve 6, two relief valves 7, a first oil pipe 8, a second oil pipe 9 and a third oil pipe 10. An oil suction filter 11 is fixed to the end of the first oil pipe 8. The first oil pipe 8 is connected to the hydraulic gear pump 2 and communicated with the oil circuit block 4. The second oil pipe 9 and the third oil pipe 10 are both fixed to the oil circuit block 4 and communicated with the oil circuit block 4. The two-position four-way valve 5, the three-position four-way valve 6 and the relief valve 7 are all detachably connected to the oil circuit block 4. The motor 1 is fixed to the oil circuit block 4, and the output end of the motor 1 is connected to the hydraulic gear pump 2.

[0026] In the hydraulic power unit, the two-position four-way valve 5, the three-position four-way valve 6, the two relief valves 7, the first oil pipe 8, the second oil pipe 9 and the third oil pipe 10 can be fixed on the oil circuit block 4 by threaded connection, so as to realize the disassembly, assembly and replacement of these components;

[0027] When the hydraulic power unit is working, the motor 1 drives the hydraulic gear pump 2 to rotate, and the hydraulic gear pump 2 sucks oil from the oil tank 3 and then pumps oil, converting mechanical energy into pressure energy of hydraulic oil. The hydraulic oil is adjusted in direction, pressure and flow through the oil block 4 by the two-position four-way valve 5, the three-position four-way valve 6 and the two relief valves 7, and then transmitted to the oil cylinder or oil motor of the hydraulic machinery through the first oil pipe 8, the second oil pipe 9 or the third oil pipe 10, thereby controlling the change of direction, force and speed of the hydraulic motor and driving various hydraulic machinery to do work.

[0028] The oil tank 3 includes an integrally formed box body 31, a box neck 32 and an annular baffle 33. The oil tank 3 can be made of plastic material. A connecting hole 301 is formed on the annular baffle 33. The oil circuit block 4 includes a body block 41 and a protruding block 42. The hydraulic gear pump 2 is fixed on the protruding block 42. The motor 1 is fixed on the body block 41. The second oil pipe 9 and the third oil pipe 10 are both fixed on the body block 41. The body block 41 has a threaded hole 401. The protruding block 42 can extend into the box neck 32, and the first oil pipe 8, the second oil pipe 9 and the third oil pipe 10 extend into the box body 31. The annular baffle 33 is in conflict with the body block 41, and the connecting hole 301 corresponds to the threaded hole 401. A clamp 34 is sleeved on the box neck 32. The clamp 34 is used to fix the box neck 32 and the protruding block 42. The protruding block 42 is provided with a sealing ring 43 that matches the box neck 32.

[0029] The oil tank 3 made of plastic material makes the hydraulic power unit lighter; the oil tank 3 is fixed to the oil circuit block 4 by bolts 35 passing through the connecting hole 301 and the threaded hole 401, thereby fixing the annular light shielding plate to the oil circuit block 4, thereby fixing the oil tank 3 and the oil circuit block 4 together; the sealing ring is placed between the box neck 32 and the raised block 42, thereby achieving the sealing of the oil tank 3; and then the box neck 32 is tightened by the clamp 34, and the position of the clamp 34 corresponds to the sealing ring 43, thereby achieving further sealing of the oil tank 3.

[0030] The two-position four-way valve 5, the three-position four-way valve 6 and the two relief valves 7 are all fixed on the oil circuit block 4 and are connected to the oil circuit in the oil circuit block 4. The hydraulic power unit includes a main oil circuit, an ascending oil circuit, a descending oil circuit, an oil return oil circuit and a spare oil circuit. The main oil circuit is composed of a first oil pipe 8, an oil circuit block 4 and a two-position four-way valve 5. The ascending oil circuit and the descending oil circuit are composed of a second oil pipe 9, an oil circuit block 4, a two-position four-way valve 5 and a three-position four-way valve 6. The oil return oil circuit is composed of a third oil pipe 10, an oil circuit block 4 and an overflow valve 7. The spare oil circuit is composed of a second oil pipe 9, an oil circuit block 4, a two-position four-way valve 5 and another overflow valve 7, wherein:

[0031] Main oil circuit: connected to motor 1, the hydraulic oil in tank 3 drives the hydraulic gear pump 2 through motor 1 to provide hydraulic main power, and a two-position four-way valve is connected in the middle to control the opening and closing of the main oil circuit;

[0032] Ascending oil circuit: The hydraulic oil passes through the two-position four-way solenoid valve. When the oil circuit is in the passing state, it enters the three-position four-way valve. When port A is in the passing state, the hydraulic platform starts to rise. When the signal at A is disconnected, it is in the pressure-maintaining state. At this time, the lifting platform is prohibited from moving;

[0033] Descending oil circuit: hydraulic oil passes through the two-position four-way valve. When the oil circuit is in the passing state, it enters the three-position four-way valve. When port B is in the passing state, the lifting platform starts to rise. When the signal at B is disconnected, it is in the pressure-maintaining state, and the lifting platform is prohibited from moving;

[0034] Oil return line: After the hydraulic oil circulates, it returns to the oil tank 3 through the oil return pipe (third oil pipe 10), forming a loop; the overflow valve is connected in series to the oil return line, thereby increasing the stability of the hydraulic power unit;

[0035] Backup oil circuit: When the hydraulic power unit is in normal use, this oil circuit is closed with a threaded plug. It is a backup port, and a set of hydraulic cylinders can be added to expand the function of the hydraulic lifting platform.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any common changes and substitutions made by those skilled in the art within the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic power unit for a lifting platform, characterized in that: It includes a motor, a hydraulic gear pump, an oil tank, an oil block, a two-position four-way valve, a three-position four-way valve, two overflow valves, a first oil pipe, a second oil pipe and a third oil pipe. The motor and the hydraulic gear pump are both fixed on the oil block, the output end of the motor is connected to the hydraulic gear pump, the first oil pipe is connected to the hydraulic gear pump and communicates with the oil block, the second oil pipe and the third oil pipe are both fixed on the oil block and communicate with the oil block, The two-position four-way valve, the three-position four-way valve and the two relief valves are all fixed on the oil circuit block and are connected to the oil circuit in the oil circuit block. The oil tank is detachably connected to the oil circuit block, and the hydraulic gear pump, oil tank, oil circuit block, two-position four-way valve, three-position four-way valve, two overflow valves, a first oil pipe, a second oil pipe and a third oil pipe all extend into the oil tank.

2. A lifting platform hydraulic power unit according to claim 1, characterized in that: The hydraulic power unit includes a main oil circuit, an ascending oil circuit, a descending oil circuit, an oil return oil circuit and a spare oil circuit. The main oil circuit is composed of a first oil pipe, an oil circuit block and a two-position four-way valve. The ascending oil circuit and the descending oil circuit are composed of a second oil pipe, an oil circuit block, a two-position four-way valve and a three-position four-way valve. The oil return oil route is composed of a third oil pipe, an oil circuit block and an overflow valve. The backup oil circuit is composed of a second oil pipe, an oil circuit block, a two-position four-way valve and another overflow valve.

3. A lifting platform hydraulic power unit according to claim 1 or 2, characterized in that: The oil tank comprises a box body, a box neck and an annular baffle which are connected in sequence, and a connecting hole is opened on the annular baffle. The oil circuit block comprises a main body block and a raised block, the hydraulic gear pump is fixed on the raised block, the motor is fixed on the main body block, the second oil pipe and the third oil pipe are both fixed on the main body block, and a threaded hole is opened on the main body block. The protruding block can extend into the box neck, the annular baffle plate abuts against the body block, and the connecting hole corresponds to the threaded hole.

4. A lifting platform hydraulic power unit according to claim 3, characterized in that: A clamp is sleeved on the box neck, and the clamp is used to fix the box neck and the protruding block.

5. A lifting platform hydraulic power unit according to claim 4, characterized in that: The convex block is provided with a sealing ring matched with the box neck.

6. A lifting platform hydraulic power unit according to claim 3, characterized in that: The two-position four-way valve, the three-position four-way valve and the overflow valve are all detachably connected to the oil circuit block.

7. The hydraulic power unit for a lifting platform according to claim 3, characterized in that: An oil suction filter is fixed on the end of the first oil pipe.

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