Compact servo control hydraulic power unit

Abstract

The utility model discloses a compact servo control hydraulic power unit, and relates to a hydraulic power unit. Comprising a servo motor, a main connecting body, a double pump, a protective cover, an integrated control valve group, an air filter, an oil tank and a liquid level thermometer, the servo motor and the double pump are arranged above and below the main connecting body respectively, the protective cover is arranged outside the double pump, the integrated control valve group is arranged on a valve block on one side of the protective cover, and the oil tank is arranged above the valve block; and an air filter and a liquid level thermometer are arranged on the oil tank. The hydraulic control valve is vertically installed and compact and regular in appearance, the main connecting body and the valve block are subjected to high-strength aluminum alloy anodic oxidation treatment, the performance is met, meanwhile, the product is lighter, better machining performance is achieved, various hydraulic control valves are integrated on the valve block, and the hydraulic control valve is more compact due to the fact that the design of threaded plug-in type valves is adopted. And all the regulating valves and the control valves are designed on the same surface of the valve block, so that the regulation and the maintenance are very convenient.

Description

Technical Field

[0001] The present invention relates to a hydraulic power unit, in particular to a compact servo-controlled hydraulic power unit. Background Art

[0002] Hydraulic power units are an indispensable part of hydraulic systems and are widely used in the fields of engineering machinery and industrial machinery. Currently, most of the applications on the market are still in some simple control and intermittent operation conditions. In terms of flow rate, most of the products of this type on the market currently allow a flow rate of only less than 10L / min, and most of them are fixed flow rates. In summary, the present invention provides a solution that can be operated sustainably (S1 working system) and precisely controlled. It is a highly compact unit that integrates a servo motor, oil pump, oil tank, and various hydraulic control valves and sensors. In addition to sustainable operation and precise control, it is also easy to maintain, easy to adjust, and takes up very little space. It is suitable for high-demand lifting mechanisms, automated sawing machines, machine tools, equipment, etc. Summary of the Invention

[0003] In response to the deficiencies in the prior art, the purpose of the present invention is to provide a compact servo-controlled hydraulic power unit with vertical installation, compact and regular appearance. The main connector and valve block are made of high-strength aluminum alloy anodized to meet the performance requirements while making the product lighter and having better processing performance. A variety of hydraulic control valves are integrated on the valve block, all of which adopt a threaded cartridge valve design to make it more compact, and all regulating valves and control valves are designed on the same side of the valve block, which is extremely convenient for adjustment and maintenance.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a compact servo-controlled hydraulic power unit, including a servo motor, a main connector, a duplex pump, a protective cover, an integrated control valve group, an air filter, an oil tank and a liquid level thermometer. The servo motor and the duplex pump are respectively arranged at the upper and lower parts of the main connector, a protective cover is arranged on the outside of the duplex pump, an integrated control valve group is arranged on the valve block on one side of the protective cover, an oil tank is arranged above the valve block, and an air filter and a liquid level thermometer are arranged on the oil tank.

[0005] Preferably, ventilation strips or cooling fans are provided on all four sides of the protective cover.

[0006] Preferably, the oil tank adopts a rectangular vertical structure, with an oil return port and an oil suction port provided at the bottom, and is connected to the valve block by a butt joint.

[0007] Preferably, mounting threaded holes may be provided on three sides of the main connector.

[0008] Preferably, the integrated control valve groups are all arranged on the same surface of the valve block.

[0009] The present invention adopts servo motor control, with variable flow rate and comprehensive flow rate of up to 20L / min, which is compatible with more application fields. The oil tank adopts a rectangular vertical design, with an oil return port and an oil suction port at the bottom, which is connected to the valve block with a docking joint, making it extremely convenient to disassemble. The interior of the oil tank adopts a high-low position design, with the oil return port being high and the oil suction port being low, which can prevent the air carried in the return oil from being re-inhaled into the oil pump during debugging, and plays a certain role in oil temperature control. The oil tank is also equipped with an air filter and a liquid level thermometer, and the shape and volume can also be changed according to needs. In terms of installation, the overall dimensions are only 200*390*580, which takes up very little space. The main connector has threaded holes for installation in three directions, which can be selected according to needs. In terms of heat dissipation and heat resistance, ventilation strips are provided on all four sides of the protective cover, and a cooling fan can also be configured for auxiliary heat dissipation. The oil pump and hydraulic valve are both made of high-temperature resistant seals and high-temperature resistant hydraulic oil to ensure their normal and stable operation.

[0010] The present invention has the following beneficial effects:

[0011] 1. It can realize automatic high-precision flow control. The flow rate can be changed steplessly within the set range. The servo motor speed is adjusted in real time by monitoring the main circuit pressure and the cylinder displacement detection feedback data to change the supply flow compensation flow, so that the action and speed are always kept stable. When there is abnormal data, the alarm can be set to trigger or shut down to protect the safety of the host and power unit.

[0012] 2. Extremely compact appearance, lightweight material, small and beautiful, can reduce material costs, take up little space, and has strong tolerance for installation position. The three directions of the product can be used for installation and fixation.

[0013] 3. The layout design is neat and reasonable. The control valves are all designed on the same side of the valve block, which is simple to adjust and exquisite and beautiful. On the other hand, the insertion holes are basically distributed on the same valve block surface, which improves the convenience of processing. The use of aluminum alloy material and its easy-to-cut characteristics significantly reduce the processing difficulty and cost.

[0014] 4. Maintenance and overhaul are simple. The control valves are basically designed to be located on the same side of the valve block, making disassembly simple. To disassemble the oil pump, you only need to remove the protective cover and loosen the fasteners of the integrated valve block to remove the oil pump. The motor can be fixed with bolts removed. It is also very convenient to replace the hydraulic oil. You only need to connect to the preset oil drain port and oil filling port of the valve block to change the oil.

[0015] 5. It has compatibility and can be configured with a variety of motor powers. Only the motor mounting block needs to be adjusted, and the rest does not need to be changed, which reduces design and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] Reference Figure 1-2 This specific embodiment adopts the following technical solution: a compact servo-controlled hydraulic power unit, including a servo motor 1, a main connecting body 2, a double pump 3, a protective cover 4, an integrated control valve group 5, an air filter 6, an oil tank 7 and a liquid level thermometer 8. The servo motor 1 and the double pump 3 are respectively arranged on the upper and lower parts of the main connecting body 2. A protective cover 4 is arranged on the outside of the double pump 3. An integrated control valve group 5 is arranged on the valve block on one side of the protective cover 4. An oil tank 7 is arranged above the valve block. An air filter 6 and a liquid level thermometer 8 are arranged on the oil tank 7.

[0021] It is worth noting that ventilation strips or cooling fans are provided on all four sides of the protective cover 4 .

[0022] It is noteworthy that the oil tank 7 adopts a rectangular vertical structure, with an oil return port and an oil suction port provided at the bottom, and is connected to the valve block by a docking joint.

[0023] It is worth noting that the main connector 2 can be provided with mounting threaded holes on three sides.

[0024] In addition, the integrated control valve groups 5 are all arranged on the same surface of the valve block.

[0025] The integrated control valve group 5 includes a first solenoid valve 51, a second solenoid valve 52, a third solenoid valve 53, a fourth solenoid valve 54, a fifth solenoid valve 55, a first relief valve 9, a second relief valve 10, a one-way throttle valve 12 and a high-precision speed control valve 11; wherein, the first solenoid valve 51 is used to control the oil circuit to be diverted to chamber B when the cylinder rises; the second solenoid valve 52 and the fifth solenoid valve 55 are used together to realize the flow increase control when the cylinder descends rapidly; the third solenoid valve 53 and the fourth solenoid valve 54 are used to control the oil circuit when the cylinder descends slowly; the first relief valve 9 is set to a pressure greater than the load pressure, which is used to maintain the pressure of the rising action; the second relief valve 10 is set to a pressure greater than the support force of the rodless chamber of the cylinder, which is used for pressure control during slow descent; the one-way throttle valve 12 is arranged in the rodless chamber circuit of the cylinder to limit the maximum flow; the high-precision speed control valve 11 is used to accurately adjust the speed when the cylinder descends slowly.

[0026] The principle of this specific embodiment is as follows Figure 2 As shown:

[0027] Ascending action: the servo motor 1 starts, the duplex pump 3 begins to supply oil, the first solenoid valve 51 is energized and switched to chamber B, the pressure of the relief valve 9 is set to be greater than the load pressure, the fourth solenoid valve 54 is energized to allow the oil to reach the rodless chamber of the cylinder for an ascending action, and the speed is variable. When the ascent stops, the fourth solenoid valve 54 is de-energized to maintain the pressure.

[0028] Descending action:

[0029] 1. Rapid descent, the servo motor 1 starts, the speed is increased, the double pump 3 begins to supply a large amount of oil, the first solenoid valve 51, the second solenoid valve 52, and the fifth solenoid valve 55 are energized to increase the pump flow again and all flow to the rod chamber of the cylinder. The fourth solenoid valve 54 is energized to make the cylinder descend as quickly as possible to the specified position (such as the working position). The rodless chamber circuit of the cylinder is provided with a one-way throttle valve 12, which can limit the maximum flow so that the cylinder descent speed is within the control range to avoid accidental stall of the cylinder and cause danger.

[0030] 2. Slow (working feed) descent, the servo motor 1 is started, the fifth solenoid valve 55 is energized to the A chamber, the first solenoid valve 51 is energized to the B chamber, the double pump 3 supplies oil to the rod chamber and the rodless chamber of the cylinder respectively, and the pressure of the relief valve 10 is set to be greater than the supporting force of the rodless chamber of the cylinder. The third solenoid valve 53 and the fourth solenoid valve 54 are energized so that the cylinder can stably descend. The high-precision speed control valve 11 set by the circuit can accurately control the descent speed. If more precise control is required, a proximity displacement sensor can be configured on the cylinder. Combined with the data fed back by the main circuit pressure sensor, the servo motor speed can be configured in real time through the PLC system to make the cylinder circuit pressure greater than the set value of the relief valve 9, and the opening can be controlled to compensate for the flow error and achieve more precise descent speed control.

[0031] This specific embodiment uses a servo motor and a twin gear pump, primarily for controlling the lifting cylinder, providing more precise control of loaded lowering. Relief valves are installed at both the pump outlet and the working port to control and regulate circuit pressure. The lifting and lowering speeds can be infinitely varied, and there are two control modes for descent: fast and slow (working feed). During fast descent, the servo motor increases speed and the dual pumps simultaneously supply oil to the rod chamber, allowing the cylinder to quickly reach a specified position (such as the working feed position). During slow (working feed) descent, the dual pumps supply oil to both cylinder chambers, ensuring even pressure and stable descent. A high-precision speed regulating valve is also included for precise control of descent speed. Pressure and flow sensors can also be installed in the main circuit, and the cylinder is equipped with a proximity displacement sensor for real-time data during descent. A relief valve in the rodless chamber circuit compensates for descent errors, achieving more precise descent speed control. The product is also equipped with a pressure safety valve and a flow safety valve, which can use sensor feedback to set alarms or shutdown commands to protect the operator, the main equipment, and the power unit.

[0032] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact servo-controlled hydraulic power unit, characterized in that: The invention comprises a servo motor (1), a main connecting body (2), a double pump (3), a protective cover (4), an integrated control valve group (5), an air filter (6), an oil tank (7) and a liquid level thermometer (8); the servo motor (1) and the double pump (3) are respectively arranged above and below the main connecting body (2); a protective cover (4) is arranged outside the double pump (3); an integrated control valve group (5) is arranged on a valve block on one side of the protective cover (4); an oil tank (7) is arranged above the valve block; an air filter (6) and a liquid level thermometer (8) are arranged on the oil tank (7); the integrated control valve group (5) comprises a first solenoid valve (51), a second solenoid valve (52), a third solenoid valve (53), a fourth solenoid valve (54), a fifth solenoid valve (55), a first overflow valve (9), a second overflow valve (10), a single A one-way throttle valve (12) and a high-precision speed regulating valve (11); wherein the first solenoid valve (51) is used to control the oil circuit to be switched to chamber B when the oil cylinder rises; the second solenoid valve (52) and the fifth solenoid valve (55) cooperate to realize the flow increase control when the oil cylinder quickly descends; the third solenoid valve (53) and the fourth solenoid valve (54) are used to control the oil circuit when the oil cylinder slowly descends; the first relief valve (9) is set to a pressure greater than the load pressure and is used to maintain the pressure of the rising action; the second relief valve (10) is set to a pressure greater than the supporting force of the rodless chamber of the oil cylinder and is used for pressure control when it slowly descends; the one-way throttle valve (12) is set in the rodless chamber circuit of the oil cylinder and is used to limit the maximum flow; the high-precision speed regulating valve (11) is used to accurately adjust the speed when the oil cylinder slowly descends.

2. A compact servo-controlled hydraulic power unit according to claim 1, characterized in that: The protective cover (4) is provided with ventilation strips or cooling fans on all four sides.

3. A compact servo-controlled hydraulic power unit according to claim 1, characterized in that: The oil tank (7) adopts a rectangular vertical structure, is provided with an oil return port and an oil suction port at the bottom, and is connected to the valve block by a butt joint.

4. A compact servo-controlled hydraulic power unit according to claim 1, characterized in that: The main connecting body (2) can be provided with mounting threaded holes on three sides.

5. A compact servo-controlled hydraulic power unit according to claim 1, characterized in that: The integrated control valve groups (5) are all arranged on the same surface of the valve block.

6. A compact servo-controlled hydraulic power unit according to claim 1, characterized in that: The interior of the oil tank (7) adopts a high-low position design, with the oil return position being high and the oil suction position being low.

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