Energy-saving servo hydraulic device

Abstract

The utility model discloses an energy -saving servo hydraulic device, including support seat, the support seat upper end fixed mounting has permanent magnet synchronous motor, permanent magnet synchronous motor one end fixed mounting has ration gear pump, and ration gear pump outer wall fixed mounting has the oil outlet pipe, the oil outlet pipe outer wall fixed mounting has the plug -in valve, the oil outlet pipe one end fixed mounting is in the oil inlet place of cylinder barrel inside, the cylinder barrel inside sliding connection has piston rod, the cylinder barrel outer wall bottom fixedly set up has the oil return pipe, the oil return pipe one end fixed mounting has the hydraulic motor, the hydraulic motor rear side is connected with engine through the shaft coupling, one side of hydraulic motor is provided with rectifier, ration gear pump upper end fixed mounting has encoder, ration gear pump one side front side is located support seat upper end fixed setting up has the oil tank, can realize direct control pump's output flow and pressure, replace traditional overflow valve adjustment, eliminate overflow loss, improve energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, and in particular to an energy-saving servo hydraulic device. Background Technology

[0002] Energy-saving servo hydraulic devices are hydraulic systems based on permanent magnet synchronous motor drive technology. By precisely controlling the motor speed and torque, they replace the "overflow and throttling" adjustment method of traditional fixed displacement pumps or proportional valves, achieving high-efficiency output of the hydraulic system and reducing energy loss at the source.

[0003] Existing servo hydraulic devices have some shortcomings in use. Traditional hydraulic systems often use asynchronous motors to drive fixed displacement pumps or variable displacement pumps, and adjust pressure and flow through hydraulic valve groups such as relief valves. During the system pressure regulation process, the relief valve continuously overflows, causing a large amount of energy to be lost in the form of heat. The overall energy utilization rate of the system is only 50%-70%, which affects the energy-saving use of the hydraulic device. To address the above problems, an energy-saving servo hydraulic device is proposed for improvement and upgrading. Utility Model Content

[0004] The purpose of this invention is to provide an energy-saving servo hydraulic device to solve the problems mentioned in the background art.

[0005] To solve the above problems, the following technical solution is provided: an energy-saving servo hydraulic device, including a support base, a permanent magnet synchronous motor fixedly mounted on the upper end of the support base, a fixedly mounted quantitative gear pump fixedly mounted on one end of the permanent magnet synchronous motor, an oil outlet pipe fixedly mounted on the outer wall of the quantitative gear pump, a cartridge valve fixedly mounted on the outer wall of the oil outlet pipe, one end of the oil outlet pipe fixedly mounted at the oil inlet inside the cylinder, a piston rod slidably connected inside the cylinder, a return oil pipe fixedly provided at the bottom of the outer wall of the cylinder, a hydraulic motor fixedly mounted on one end of the return oil pipe, the rear side of the hydraulic motor connected to the engine via a coupling, and a rectifier provided on one side of the hydraulic motor.

[0006] As a preferred embodiment of the above technical solution, an encoder is fixedly installed on the upper end of the quantitative gear pump, and an oil storage tank is fixedly installed on the front side of one side of the quantitative gear pump at the upper end of the support base. The quantitative gear pump and the oil storage tank are connected by an oil delivery pipe.

[0007] As a preferred embodiment of the above technical solution, a pressure sensor is fixedly installed on the outer wall of the oil outlet pipe, a flow sensor is fixedly installed on the outer wall of the oil return pipe, and end caps are fixedly installed at both the upper and lower ends of the cylinder.

[0008] As a preferred embodiment of the above technical solution, the cylinder is made of high-strength steel, the piston rod surface is chrome-plated, the pressure sensor and flow sensor are both close to the oil inlet and oil outlet, and the cylinder is fixedly mounted on the base.

[0009] As a preferred embodiment of the above technical solution, a PLC control box is fixedly installed on the upper end of the support base, a display screen is fixedly installed on the outer wall of the PLC control box, and two indicator lights are symmetrically arranged on the upper end of the PLC control box.

[0010] As a preferred embodiment of the above technical solution, the rectifier is made in a rectangular shape and has multiple heat sinks fixedly installed inside, and a multi-stage system filter is fixedly installed on the upper end of the support base on the side of the permanent magnet synchronous motor.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] Servo drive energy saving: The permanent magnet synchronous motor is directly connected to the fixed displacement gear pump. The driver uses a vector control algorithm to precisely adjust the motor speed and torque, directly controlling the pump's output flow and pressure, replacing the traditional overflow valve regulation, eliminating overflow loss and improving energy efficiency.

[0013] Energy saving in hydraulic operation: Large-diameter cartridge valves reduce pressure loss in hydraulic oil flow, pressure and flow sensors monitor data in real time, and the intelligent control module adjusts the opening and closing of the valve and the degree of opening accordingly, accurately controlling the hydraulic cylinder action and avoiding energy waste.

[0014] Energy recovery and energy saving: When the hydraulic cylinder descends or brakes, the hydraulic oil drives the hydraulic motor to generate electricity, which is then converted into DC power feedback system by the rectifier; multi-stage filtration device ensures normal system operation and reduces failures and energy loss caused by impurities.

[0015] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of an energy-saving servo hydraulic device according to the present invention;

[0018] Figure 2This is a schematic diagram of the rear structure of an energy-saving servo hydraulic device according to the present invention;

[0019] Figure 3 for Figure 1 A magnified diagram of the partially disassembled structure.

[0020] In the diagram: 1. Support base; 2. Permanent magnet synchronous motor; 3. Fixed displacement gear pump; 4. Encoder; 5. PLC control box; 51. Indicator light; 6. Display screen; 7. Oil outlet pipe; 8. Cylinder; 9. Oil return pipe; 10. Pressure sensor; 11. Flow sensor; 12. Piston rod; 13. Cartridge valve; 14. Oil reservoir; 15. Hydraulic motor; 16. Rectifier; 17. Oil delivery pipe; 18. Base. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 3 As shown, this embodiment provides an energy-saving servo hydraulic device, including a support base 1. A permanent magnet synchronous motor 2 is fixedly installed on the upper end of the support base 1. A fixed displacement gear pump 3 is fixedly installed on one end of the permanent magnet synchronous motor 2. An oil outlet pipe 7 is fixedly installed on the outer wall of the fixed displacement gear pump 3. A cartridge valve 13 is fixedly installed on the outer wall of the oil outlet pipe 7. One end of the oil outlet pipe 7 is fixedly installed at the oil inlet inside the cylinder 8. A piston rod 12 is slidably connected inside the cylinder 8. A return oil pipe 9 is fixedly provided at the bottom of the outer wall of the cylinder 8. A hydraulic motor 15 is fixedly installed at one end of the return oil pipe 9. The rear side of the hydraulic motor 15 is connected to the engine through a coupling. A rectifier 16 is provided on one side of the hydraulic motor 15.

[0023] like Figures 2 to 3 As shown, an encoder 4 is fixedly installed on the upper end of the fixed displacement gear pump 3. An oil storage tank 14 is fixedly installed on the front side of one side of the fixed displacement gear pump 3 at the upper end of the support base 1. The fixed displacement gear pump 3 and the oil storage tank 14 are connected by an oil delivery pipe 17. A pressure sensor 10 is fixedly installed on the outer wall of the oil outlet pipe 7. A flow sensor 11 is fixedly installed on the outer wall of the oil return pipe 9. End caps are fixedly installed on both the upper and lower ends of the cylinder 8. The cylinder 8 is made of high-strength steel. The surface of the piston rod 12 is chrome-plated. The pressure sensor 10 and the flow sensor 11 are close to the oil inlet and oil outlet, respectively. The cylinder 8 is fixedly installed on the base 18.

[0024] By using aluminum alloy for the housing of the permanent magnet synchronous motor 2, with heat dissipation fins on its surface, the heat generated by the motor operation can be efficiently conducted to maintain stable motor operation. One end of the motor is a shaft extension for connecting to the fixed displacement gear pump 3. The shaft extension has a protective device to prevent foreign objects from being drawn in. By setting an encoder 4, it is possible to provide real-time feedback of motor speed and position signals, laying the foundation for precise control. The encoder 4 is a 23-bit multi-turn absolute encoder 4, which provides a power source for the system. At the same time, a cartridge valve 13 is set. The valve core of the cartridge valve 13 can move quickly in the valve body to realize the opening and closing of the oil circuit and the regulation of flow. Its compact structure can effectively reduce the pressure loss of the oil circuit. By setting a pressure sensor 10 and a flow sensor 11, it is possible to monitor the oil pressure in real time and accurately control the oil flow.

[0025] A PLC control box 5 is fixedly installed on the upper end of the support base 1. A display screen 6 is fixedly installed on the outer wall of the PLC control box 5. Two indicator lights 51 are symmetrically arranged on the upper end of the PLC control box 5. The rectifier 16 is made in a rectangular shape and has multiple heat sinks fixedly installed inside. A multi-stage system filter is fixedly installed on the upper end of the support base 1 on one side of the permanent magnet synchronous motor 2.

[0026] The PLC control box 5 is typically rectangular in shape and uses a metal casing. The front panel features a display screen 6 and operation buttons, with indicator lights 51 that visually display the driver's operating status, such as power on and fault alarms. The display screen 6 shows real-time motor operating parameters, such as speed, current, and torque. The operation buttons are used for parameter settings and function switching. The rectifier 16 is usually a flat rectangular shape, internally composed of rectifier and filter circuits. Its casing has heat sinks to dissipate heat generated during operation. The system integrates a multi-stage filter, typically composed of multiple filters of varying precision connected in series. The filter casing is cylindrical, made of stainless steel, and has oil inlet / outlet and drain ports.

[0027] The working principle and process of this utility model are as follows: When the system receives the start production command of the injection molding machine, the PLC control box 5 responds immediately. By combining the system parameters collected in real time by the pressure sensor 10 and the flow sensor 11, as well as the built-in PID control algorithm and AI prediction model, it quickly calculates the required speed and torque of the permanent magnet synchronous motor 2 to meet the pressure and flow requirements of the hydraulic system for the current work task. The driver in the servo drive module adjusts the speed and torque of the permanent magnet synchronous motor 2 in milliseconds according to the command of the PLC control box 5 using a vector control algorithm. At the same time, it drives the fixed displacement gear pump 3 to output pressure oil of the corresponding flow rate to provide sufficient clamping force. The fixed displacement gear pump 3 draws oil from the oil storage tank 14 through the oil outlet pipe 7 and then flows into the cylinder 8 through the oil outlet pipe 7. The large-diameter cartridge valve 13 of the main oil circuit quickly switches the oil circuit on / off and adjusts the flow rate according to the signal of the PLC control box 5, which greatly reduces the energy loss in the oil flow process. The pressure sensor 10 and the flow sensor 11 continuously monitor the pressure at the oil inlet and the flow rate at the oil return port of the hydraulic cylinder and reflect the data in real time. Feedback is sent to PLC control box 5 to form a closed-loop control. Based on the feedback data, PLC control box 5 further fine-tunes the speed of permanent magnet synchronous motor 2 and the opening of cartridge valve 13 to ensure that the system pressure and flow are stable within the set range, thereby achieving precise control of the actions of the hydraulic cylinder and hydraulic motor 15. When the piston rod 12 in the hydraulic cylinder descends, the potential energy of the load drives the hydraulic oil along the return oil pipe 9, driving the hydraulic motor 15 in the energy recovery module to rotate. The hydraulic motor 15 converts mechanical energy into electrical energy. The generated AC power is converted into DC power by rectifier 16 and fed back to the DC bus of the servo driver to power the permanent magnet synchronous motor 2 and other equipment, realizing the recycling of energy. At the same time, the multi-stage filter integrated in the system continuously filters the hydraulic oil to ensure that the filtration accuracy is controlled within a certain range, preventing impurities from entering the system and affecting the normal operation of the equipment.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

Claims

1. An energy-saving servo hydraulic device, characterized in that, Includes a support base (1), on which a permanent magnet synchronous motor (2) is fixedly installed. A fixed-displacement gear pump (3) is fixedly installed at one end of the permanent magnet synchronous motor (2), and an oil outlet pipe (7) is fixedly installed on the outer wall of the fixed-displacement gear pump (3). A cartridge valve (13) is fixedly installed on the outer wall of the oil outlet pipe (7). One end of the oil outlet pipe (7) is fixedly installed at the oil inlet inside the cylinder (8). A piston rod (12) is slidably connected inside the cylinder (8). A return oil pipe (9) is fixedly installed at the bottom of the outer wall of the cylinder (8). A hydraulic motor (15) is fixedly installed at one end of the return oil pipe (9). The rear side of the hydraulic motor (15) is connected to the engine through a coupling. A rectifier (16) is provided on one side of the hydraulic motor (15).

2. The energy-saving servo hydraulic device according to claim 1, characterized in that, An encoder (4) is fixedly installed on the upper end of the quantitative gear pump (3). An oil storage tank (14) is fixedly installed on the front side of one side of the quantitative gear pump (3) at the upper end of the support base (1). The quantitative gear pump (3) and the oil storage tank (14) are connected by an oil delivery pipe (17).

3. The energy-saving servo hydraulic device according to claim 2, characterized in that, A pressure sensor (10) is fixedly installed on the outer wall of the oil outlet pipe (7), a flow sensor (11) is fixedly installed on the outer wall of the oil return pipe (9), and end caps are fixedly installed on both the upper and lower ends of the cylinder (8).

4. The energy-saving servo hydraulic device according to claim 3, characterized in that, The cylinder (8) is made of high-strength steel, the piston rod (12) is chrome-plated, the pressure sensor (10) and flow sensor (11) are close to the oil inlet and oil outlet, and the cylinder (8) is fixedly mounted on the base (18).

5. The energy-saving servo hydraulic device according to claim 1, characterized in that, A PLC control box (5) is fixedly installed on the upper end of the support base (1). A display screen (6) is fixedly installed on the outer wall of the PLC control box (5). Two indicator lights (51) are symmetrically arranged on the upper end of the PLC control box (5).

6. The energy-saving servo hydraulic device according to claim 1, characterized in that, The rectifier (16) is made in a rectangular shape and has multiple heat sinks fixedly installed inside. The upper end of the support base (1) is fixedly installed with a multi-stage system filter on one side of the permanent magnet synchronous motor (2).

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