Servo oil pressure control system for explosion-proof environment

Abstract

The utility model relates to a servo oil pressure control system for an explosion-proof environment, which comprises an upper computer, a driver, a servo explosion-proof motor, a bidirectional oil pump and an oil cylinder, the output end of the driver is connected with the servo explosion-proof motor, the input end of the driver is connected with the upper computer, and the upper computer is used for giving a pressure flow signal to the driver to control the servo explosion-proof motor. The servo explosion-proof motor is connected with the two-way oil pump which is connected with the oil cylinder through the oil inlet and outlet way, the oil inlet and outlet way is provided with a pressure sensor used for monitoring the pressure of the oil inlet and outlet way, and the pressure sensor is connected with the driver and used for transmitting the pressure of the oil inlet and outlet way to the driver. The driver is used for controlling the oil cylinder to act after comparing the oil inlet and outlet path pressure with the set pressure. Under the condition that an anti-explosion element is not added, proportional pressure and flow control of the oil cylinder is achieved, movement of the oil cylinder can be accurately controlled, redundant pressure and flow loss is avoided, heat is little, efficiency is high, an oil tank can be miniaturized, and the structure of a control system is more compact.

Description

Technical Field

[0001] The utility model relates to a servo control system, in particular to a servo oil pressure control system used in an explosion-proof environment. Background Art

[0002] In complex explosion-proof environments, in order to reduce costs, the use of explosion-proof components should be minimized. To improve the system's functionality, servo control of pressure and flow should be achieved. It is more environmentally friendly and improves efficiency when used under conditions with relatively strict space requirements.

[0003] The existing explosion-proof control system uses ordinary explosion-proof motors in explosion-proof environments, which have low efficiency, cannot automatically control the pressure, and cannot control the speed of the oil cylinder as needed. It has a slow response speed, is not energy-efficient, has high noise, and also requires oil temperature control. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a servo oil pressure control system for explosion-proof environment, which realizes pressure closed-loop control by using a servo explosion-proof motor to drive a bidirectional oil pump and controlling the pressure sensor and the driver.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A servo oil pressure control system for an explosion-proof environment comprises a host computer, a driver, a servo explosion-proof motor, a bidirectional oil pump and an oil cylinder, wherein the output end of the driver is connected to the servo explosion-proof motor, the input end of the driver is connected to the host computer, the host computer is used to give a pressure flow signal to the driver to control the servo explosion-proof motor, the servo explosion-proof motor is connected to the bidirectional oil pump, the bidirectional oil pump is connected to the oil cylinder via an inlet and outlet oil line, a pressure sensor for monitoring the inlet and outlet oil line pressure is provided on the inlet and outlet oil line, the pressure sensor is connected to the driver to transmit the inlet and outlet oil line pressure to the driver, and the driver is used to control the oil cylinder action after comparing the inlet and outlet oil line pressure with the set pressure.

[0007] Furthermore, the inlet and outlet oil circuits include an oil pump oil circuit and an oil cylinder oil circuit. One end of the bidirectional oil pump is connected to one end of the oil cylinder through the oil pump oil circuit, and the other end of the oil cylinder is connected to the other end of the bidirectional oil pump through the oil cylinder oil circuit to form a loop.

[0008] Furthermore, a first pressure sensor is provided on the oil circuit of the oil pump, and a second pressure sensor is provided on the oil circuit of the oil cylinder, and both the first pressure sensor and the second pressure sensor are connected to the driver.

[0009] Furthermore, a safety relief valve is connected in series between the first pressure sensor and the second pressure sensor.

[0010] Furthermore, a first pressure gauge is provided on the oil pump oil circuit, and a second pressure gauge is provided on the oil cylinder oil circuit.

[0011] Furthermore, the oil pump oil circuit and the cylinder oil circuit are connected in series with a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve. The first hydraulically controlled one-way valve is connected in series to the oil pump oil circuit close to one end of the two-way oil pump and to the cylinder oil circuit away from the other end of the two-way oil pump. The second hydraulically controlled one-way valve is connected in series to the oil pump oil circuit away from one end of the two-way oil pump and to the cylinder oil circuit close to the other end of the two-way oil pump.

[0012] Furthermore, the safety relief valve is connected to a shuttle valve, and the shuttle valve is connected in series between the first pressure sensor and the second pressure sensor.

[0013] Furthermore, the first pressure sensor and the second pressure sensor are arranged on the valve plate, and the valve plate and the bidirectional oil pump are both arranged in the oil tank.

[0014] Furthermore, a motor encoder is provided on the motor spindle of the servo explosion-proof motor, and the motor encoder is electrically connected to the driver.

[0015] The utility model adopts the above technical solution, which has the following advantages and effects:

[0016] (1) The utility model provides a servo oil pressure control system for explosion-proof environment. By using a servo explosion-proof motor to drive a bidirectional oil pump, pressure closed-loop control is achieved through pressure sensors and driver control. Without adding explosion-proof components, proportional pressure and flow control of the oil cylinder is achieved. The movement of the oil cylinder can be accurately controlled without unnecessary pressure and flow loss. The system generates less heat and has high efficiency. Therefore, the oil tank can be miniaturized, making the structure of the control system more compact.

[0017] (2) The utility model provides a servo oil pressure control system for explosion-proof environment, which adopts servo explosion-proof motor to form pressure closed-loop control. The servo explosion-proof motor controls the bidirectional oil pump to provide the required pressure and flow of the control system. There is no pressure and flow loss, and no excess heat is generated. Therefore, the temperature of the hydraulic oil will not rise. The control system does not need to control the oil temperature, thus saving energy and reducing consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the control system of the utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the original servo hydraulic control system.

[0020] The accompanying drawings are marked as follows: 1-host computer, 2-driver, 3-servo explosion-proof motor, 4-bidirectional oil pump, 5-hydraulic one-way valve, 6-first pressure sensor, 61-second pressure sensor, 7-first pressure gauge, 71-second pressure gauge, 8-shuttle valve, 9-safety overflow valve, 10-oil cylinder. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings to describe the embodiments of the present invention in detail, so as to more clearly understand the purpose, characteristics and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0022] like Figure 1 The utility model provides a servo oil pressure control system for explosion-proof environment, including a host computer 1, a driver 2, a servo explosion-proof motor 3, a bidirectional oil pump 4 and a cylinder 10, wherein the output end of the driver 2 is connected to the servo explosion-proof motor 3, the input end of the driver 2 is connected to the host computer 1, the host computer 1 is used to give a pressure flow signal to the driver 2 to control the servo explosion-proof motor 3, the servo explosion-proof motor 3 is connected to the bidirectional oil pump 4, the bidirectional oil pump 4 is connected to the cylinder 10 through an inlet and outlet oil line, a pressure sensor for monitoring the inlet and outlet oil line pressure is provided on the inlet and outlet oil line, the pressure sensor is connected to the driver 2 to transmit the inlet and outlet oil line pressure to the driver 2, and the driver 2 is used to control the action of the cylinder 10 after comparing the inlet and outlet oil line pressure with the set pressure.

[0023] Specifically, the bidirectional oil pump 4 and the oil cylinder 10 are connected in series through the inlet and outlet oil lines to form a loop, and the bidirectional oil pump 4 is located in the oil tank. The oil tank is filled with hydraulic oil, and the upper computer 1 communicates the pressure flow signal to the driver 2, and the driver 2 controls the forward and reverse rotation of the servo explosion-proof motor 3 to drive the hydraulic oil to push the oil cylinder 10 in and out.

[0024] In an explosion-proof environment, the utility model realizes servo control of the oil cylinder 10 by driving the bidirectional oil pump 4 through the servo explosion-proof motor 3. The upper computer 1 sets the pressure flow signal size of the movement of the oil cylinder 10, and controls the forward and reverse rotation speed of the motor through the driver 2 to realize the in and out movement of the piston rod of the oil cylinder 10. The in and out oil circuit pressure feedback detected by the pressure sensor is compared with the set pressure to realize the servo control of the oil cylinder 10.

[0025] The driver 2 controls the speed of the servo explosion-proof motor 3 according to the flow signal of the pressure flow signal, thereby achieving the purpose of controlling the system flow. When the driver 2 controls the number of revolutions of the servo explosion-proof motor 3 by a given flow signal, a motor encoder is provided on the motor spindle of the servo explosion-proof motor 3, and the motor encoder is electrically connected to the driver 2. The actual speed of the servo explosion-proof motor 3 is fed back by the motor encoder and compared with the set speed, thereby realizing the speed closed-loop control of the servo explosion-proof motor 3.

[0026] The driver 2 of the utility model is preferably the Inovance IS580 series, and the host computer 1 is preferably Mitsubishi PLC-FX2N-48mt. The servo explosion-proof motor 3 is connected to the bidirectional oil pump 4 through a bell housing and a coupling to provide power for the entire control system.

[0027] Furthermore, the inlet and outlet oil circuits include an oil pump oil circuit and an oil cylinder oil circuit. The two-way oil pump 4 and the oil cylinder 10 are connected in series through the oil pump oil circuit and the oil cylinder oil circuit to form a closed loop. One end of the two-way oil pump 4 is connected to one end of the oil cylinder 10 through the oil pump oil circuit, and the other end of the oil cylinder 10 is connected to the other end of the two-way oil pump 4 through the oil cylinder oil circuit to form a loop.

[0028] Furthermore, a first pressure sensor 6 is provided on the oil pump oil circuit, and a second pressure sensor 61 is provided on the oil cylinder oil circuit. Both the first pressure sensor 6 and the second pressure sensor 61 are connected to the driver 2 .

[0029] Specifically, a pair of pressure sensors are connected to the driver 2 at the same time to transmit the pressure of the inlet and outlet oil circuits to the driver 2. When the pressure reaches the set value, the feedback signal of the first pressure sensor 6 or the second pressure sensor 61 is transmitted to the driver 2, and the driver 2 controls the speed of the servo explosion-proof motor 3 to reduce the number of revolutions of the servo explosion-proof motor 3 to maintain the set pressure of the host computer 1. When the pressure does not reach the set value, it runs according to the set number of revolutions, and the pressure and speed of the oil cylinder 10 can be accurately controlled.

[0030] Furthermore, a safety relief valve 9 is connected in series between the first pressure sensor 6 and the second pressure sensor 61. The safety relief valve 9 is used to limit the maximum pressure of the oil cylinder oil circuit and the oil pump oil circuit, and plays the role of a safety valve. When the pressure of the oil cylinder oil circuit or the oil pump oil circuit exceeds the set pressure, the hydraulic oil is leaked from the safety relief valve to ensure that the control system pressure does not exceed the set pressure.

[0031] Furthermore, the oil pump oil circuit is provided with a first pressure gauge 7, and the oil cylinder oil circuit is provided with a second pressure gauge 71. The first pressure gauge 7 and the second pressure gauge 71 are used to display the pressure of the oil pump oil circuit and the oil cylinder oil circuit respectively.

[0032] Furthermore, a first hydraulically controlled one-way valve 5 and a second hydraulically controlled one-way valve 5 are connected in series in the oil pump oil circuit and the cylinder oil circuit. The first hydraulically controlled one-way valve 5 is connected in series in the oil pump oil circuit close to one end of the two-way oil pump 4 and in the cylinder oil circuit away from the other end of the two-way oil pump 4. The second hydraulically controlled one-way valve 5 is connected in series in the oil pump oil circuit away from one end of the two-way oil pump 4 and in the cylinder oil circuit close to the other end of the two-way oil pump 4.

[0033] Specifically, the first hydraulically controlled one-way valve 5 and the second hydraulically controlled one-way valve 5 are used to ensure that the two-way oil pump 4 can smoothly absorb oil when rotating forward and reversely, and the oil pump oil circuit and the oil cylinder oil circuit can maintain pressure without leakage. When the two-way oil pump 4 rotates clockwise, the oil outlet of the two-way oil pump is ( Figure 1 The pressure port on the left side of the two-way oil pump is the suction port. At this time, the first hydraulically controlled one-way valve 5 on the left side serves to cut off the pressure line from the oil return line, while the second hydraulically controlled one-way valve 5 is opened by the pilot pressure, so that the oil return line is connected to the suction port of the oil tank. When the two-way oil pump 4 rotates counterclockwise, the situation is just the opposite.

[0034] Furthermore, the safety relief valve 9 is connected to a shuttle valve 8, which is connected in series between the first pressure sensor 6 and the second pressure sensor 61. The shuttle valve 8 is used to automatically select the higher pressure end of the two pilot pressures as the pilot pressure, and to close the control port when the two pilot pressures are low.

[0035] like Figure 2 Compared with the original control system using two safety relief valves 9, the utility model can achieve the original function through one shuttle valve 8 and one safety relief valve 9. In the absence of throttling and pressure loss, the existing control system generates less heat, has good energy-saving effect and fast response speed.

[0036] Furthermore, the first pressure sensor 6 and the second pressure sensor 61 are both arranged on the valve plate, and the valve plate and the bidirectional oil pump 4 are arranged together in a closed oil tank, so the first pressure sensor 6 and the second pressure sensor 61 do not need to be explosion-proofed.

[0037] The utility model discloses a servo oil pressure control system for explosion-proof environment. When used in coal mine machinery, the required specification flow is 14.4L and the pressure is 12MPa. The original control system has an oil tank size of 75L and a motor power of 4KWX4P. The control system of the utility model is equipped with an oil tank of 40L and a servo explosion-proof motor 3 with a power of 3KW.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A servo oil pressure control system for explosion-proof environment, characterized in that: It includes a host computer, a driver, a servo explosion-proof motor, a bidirectional oil pump and a cylinder. The output end of the driver is connected to the servo explosion-proof motor, the input end of the driver is connected to the host computer, the host computer is used to give a pressure flow signal to the driver to control the servo explosion-proof motor, the servo explosion-proof motor is connected to the bidirectional oil pump, the bidirectional oil pump is connected to the cylinder through an inlet and outlet oil line, a pressure sensor for monitoring the inlet and outlet oil line pressure is provided on the inlet and outlet oil line, the pressure sensor is connected to the driver to transmit the inlet and outlet oil line pressure to the driver, and the driver is used to control the cylinder action after comparing the inlet and outlet oil line pressure with the set pressure.

2. The servo oil pressure control system for explosion-proof environment according to claim 1, characterized in that: The inlet and outlet oil circuits include an oil pump oil circuit and an oil cylinder oil circuit. One end of the bidirectional oil pump is connected to one end of the oil cylinder through the oil pump oil circuit, and the other end of the oil cylinder is connected to the other end of the bidirectional oil pump through the oil cylinder oil circuit to form a loop.

3. The servo oil pressure control system for explosion-proof environment according to claim 2, characterized in that: The oil pump oil circuit is provided with a first pressure sensor, the oil cylinder oil circuit is provided with a second pressure sensor, and both the first pressure sensor and the second pressure sensor are connected to the driver.

4. The servo oil pressure control system for explosion-proof environment according to claim 3, characterized in that: A safety relief valve is connected in series between the first pressure sensor and the second pressure sensor.

5. The servo oil pressure control system for explosion-proof environment according to claim 4, characterized in that: The oil pump oil circuit is provided with a first pressure gauge, and the oil cylinder oil circuit is provided with a second pressure gauge.

6. The servo oil pressure control system for explosion-proof environment according to claim 5, characterized in that: The oil pump oil circuit and the cylinder oil circuit are connected in series with a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve. The first hydraulically controlled one-way valve is connected in series to the oil pump oil circuit close to one end of the two-way oil pump and to the cylinder oil circuit away from the other end of the two-way oil pump. The second hydraulically controlled one-way valve is connected in series to the oil pump oil circuit away from one end of the two-way oil pump and to the cylinder oil circuit close to the other end of the two-way oil pump.

7. The servo oil pressure control system for explosion-proof environment according to claim 4, characterized in that: The safety relief valve is connected to a shuttle valve, and the shuttle valve is connected in series between the first pressure sensor and the second pressure sensor.

8. The servo oil pressure control system for explosion-proof environment according to claim 7, characterized in that: The first pressure sensor and the second pressure sensor are arranged on the valve plate, and the valve plate and the bidirectional oil pump are both arranged in the oil tank.

9. The servo oil pressure control system for explosion-proof environment according to claim 8, characterized in that: A motor encoder is arranged on the motor main shaft of the servo explosion-proof motor, and the motor encoder is electrically connected to the driver.

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