MarketsHydraulic system in the quality inspection and special equipment

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Because hydraulic technology has the characteristics of large output, pressure, flow and other parameters, it is convenient to achieve accurate measurement and protection. In recent years, it has been obtained in various types of quality inspection equipment and special equipment in measuring length, heat, mechanics, and electromagnetics. Increasingly widely used.

Picture shows the schematic diagram of the hydraulic system of the device. The main working oil of the system is composed of the hydraulic pump 2 and the oil circuit where it is located. The oil circuit pressure is determined by the electro-hydraulic proportional relief valve 5. The oil circuit of the hydraulic pump 1 constitutes the high-pressure sealed oil circuit of the system, and the pressure is determined by the electro-hydraulic proportional relief valve 4, and the pressure needs to be slightly lower than the oil pressure in the working hydraulic cylinder 1. Since this system is a precision metering system and has high requirements for the cleanliness of the hydraulic oil, the system adopts the form of dual oil tanks. The main oil tank is used to supply oil to the entire hydraulic system, and the auxiliary oil tank is used to hold the return oil of the system. Equipped with a liquid level switch. When the hydraulic oil of the auxiliary oil tank exceeds a certain liquid level, the liquid level switch is turned on, the hydraulic pump 3 runs, and the auxiliary oil tank starts to fill the main oil tank. In order to improve the working reliability of the system, the inlet and outlet ports of pumps 1 and 2 are equipped with suction filter fi and pressure oil filter f. ; In order to ensure the cleanliness of the oil in the main tank, the inlet and outlet of the hydraulic pump 3 are also equipped with suction filters & and pressure oil filters. When the system is working, the solenoid 1YA is energized to switch the reversing valve 8 to the left position , The pressure oil of the hydraulic pump 2 passes through the filter. Check valve 7, reversing valve 8, hydraulic control check valve 10 and throttle valve 13 enter the working cylinder Ci and the force measuring cylinder C2. When the oil in the two cylinders is full (the stroke switch of the force measuring cylinder is in place), the solenoid Iron 1YA cuts off the power to reset valve 8 to the neutral position. The hydraulically controlled check valve keeps the two hydraulic cylinders under pressure. After a while, the pressure in the two cylinders is completely determined by the pressure formed by the weight on the force measuring cylinder. Accumulator 12 It is used to maintain pressure and buffer when the system is working at high pressure. The throttle valve 13 is used to throttle the oil in the force measuring cylinder to avoid possible overshoot due to the small diameter of the piston of the force measuring cylinder. When the system is finished and the oil in the two hydraulic cylinders needs to be released, the solenoid 2YA is energized to switch the valve 8 to the right position. The high pressure oil in the main oil circuit will open the hydraulic control check valve 10, and the oil in the cylinder Drain back to the oil tank through valve 10 and valve 8; the other branch of the oil circuit supplies oil to the lifting cylinder through the pressure reducing valve 6. As the lifting cylinder has a short working time, there is no pressure-maintaining check valve in the circuit. When the 3YA is energized When the reversing valve 9 is switched to the left position, the main oil circuit supplies oil to the lifting cylinder, and the lifting cylinder is lifted; after the 3YA is powered off, the valve 9 is returned to the neutral position, and the lifting cylinder is in a short-term pressure-holding state. When the 4YA is energized, the valve When 9 is switched to the right position, the oil in the lift cylinder is drained back to the tank through valve 9. The throttle valve 11 is used to throttle the speed of 391 and control the flow rate of the oil into the lift cylinder.

(图1)

Picture shows the schematic diagram of the hydraulic system of the device. The main working oil of the system is composed of the hydraulic pump 2 and the oil circuit where it is located. The oil circuit pressure is determined by the electro-hydraulic proportional relief valve 5. The oil circuit of the hydraulic pump 1 constitutes the high-pressure sealed oil circuit of the system, and the pressure is determined by the electro-hydraulic proportional relief valve 4, and the pressure needs to be slightly lower than the oil pressure in the working hydraulic cylinder 1. Since this system is a precision metering system and has high requirements for the cleanliness of the hydraulic oil, the system adopts the form of dual oil tanks. The main oil tank is used to supply oil to the entire hydraulic system, and the auxiliary oil tank is used to hold the return oil of the system. Equipped with a liquid level switch. When the hydraulic oil of the auxiliary oil tank exceeds a certain liquid level, the liquid level switch is turned on, the hydraulic pump 3 runs, and the auxiliary oil tank starts to fill the main oil tank. In order to improve the working reliability of the system, the inlet and outlet ports of pumps 1 and 2 are equipped with suction filter fi and pressure oil filter f. ; In order to ensure the cleanliness of the oil in the main tank, the inlet and outlet of the hydraulic pump 3 are also equipped with suction filters & and pressure oil filters. When the system is working, the solenoid 1YA is energized to switch the reversing valve 8 to the left position , The pressure oil of the hydraulic pump 2 passes through the filter. Check valve 7, reversing valve 8, hydraulic control check valve 10 and throttle valve 13 enter the working cylinder Ci and the force measuring cylinder C2. When the oil in the two cylinders is full (the stroke switch of the force measuring cylinder is in place), the solenoid Iron 1YA cuts off the power to reset valve 8 to the neutral position. The hydraulically controlled check valve keeps the two hydraulic cylinders under pressure. After a while, the pressure in the two cylinders is completely determined by the pressure formed by the weight on the force measuring cylinder. Accumulator 12 It is used to maintain pressure and buffer when the system is working at high pressure. The throttle valve 13 is used to throttle the oil in the force measuring cylinder to avoid possible overshoot due to the small diameter of the piston of the force measuring cylinder. When the system is finished and the oil in the two hydraulic cylinders needs to be released, the solenoid 2YA is energized to switch the valve 8 to the right position. The high pressure oil in the main oil circuit will open the hydraulic control check valve 10, and the oil in the cylinder Drain back to the oil tank through valve 10 and valve 8; the other branch of the oil circuit supplies oil to the lifting cylinder through the pressure reducing valve 6. As the lifting cylinder has a short working time, there is no pressure-maintaining check valve in the circuit. When the 3YA is energized When the reversing valve 9 is switched to the left position, the main oil circuit supplies oil to the lifting cylinder, and the lifting cylinder is lifted; after the 3YA is powered off, the valve 9 is returned to the neutral position, and the lifting cylinder is in a short-term pressure-holding state. When the 4YA is energized, the valve When 9 is switched to the right position, the oil in the lift cylinder is drained back to the tank through valve 9. The throttle valve 11 is used to throttle the speed of 391 and control the flow rate of the oil into the lift cylinder.

(图1)

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