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      Suzhou Shengminglong Hydraulic Equipment Co.,Ltd

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      Tel: 0512-57640771

      Fax: 0512-57640772

      Email: kssml2006@163.com

      Website: www.lesico2017.com

      Address: no.11-5, Luyang Fuyang Road, Zhoushi Town, Kunshan City, Jiangsu Province


      Kunshan Forging Press Decompression Circuit and Its Use and Maintenance

      2019-05-22

      The hydraulic pressure reducing circuit is used to reduce the system pressure to the required stable value to meet the requirements of clamping, positioning, lubrication and controlling the oil circuit of the machine tool. The circuit structure is shown in Figure 1. To reduce pressure valve to work stably, the low adjustment pressure is not less than 0.5MPa, and the high adjustment pressure is at least 0.5MPa lower than the system pressure.

      As shown in Figure 2, the hydraulic pressure reducing circuit is connected to a remote pressure regulating valve and a two-way solenoid valve at the remote control port of the pilot-type pressure reducing valve.

      The oil pressure should be low, which is called the hydraulic pressure reducing circuit. The possible failure of this circuit is that when the cylinder 2 is stopped for a long time, the secondary pressure after the pressure reducing valve 3 gradually increases.

      This is because when the cylinder 2 is stopped for a long time, a small amount of oil is discharged through the pilot valve gap through the pilot valve to keep the valve in working condition.

      Due to leakage in the valve, the flow through the pilot valve is increased, and the secondary pressure (outlet pressure) of the pressure reducing valve is increased. In order to prevent this failure, the oil pressure line shown in Figure 7-20 can be connected to the hydraulic pressure reducing circuit, and a safety valve is installed at b to ensure that the outlet pressure of the pressure reducing valve does not exceed its adjusted value.

      The leakage of the pressure reducing valve 3 of the hydraulic pressure reducing circuit shown in FIG. 3 causes the hydraulic cylinder speed regulation to fail or the speed to be unstable. Changing the throttle valve 4 from the position in the figure to a position after the pressure reducing valve in series can avoid the influence of the pressure reducing valve leakage on the speed of the hydraulic cylinder 2.

      When the pressure reducing valve and the one-way throttle valve are superimposed, it is also necessary to ensure that the one-way throttle valve is "adjacent" to the actuator to avoid the occurrence of uneven speed failure of the actuator.

      The two-stage hydraulic pressure reducing circuit shown in FIG. 4 is connected to the pressure regulating valve 4 on the oil pressure-controlled circuit of the pilot-type pressure reducing valve 3 to obtain two predetermined pressures.

      If the directional valve 5 is connected in front of the pressure regulating valve 4, the pressure shock will occur when the two-stage pressure is switched (the electromagnet is energized, and the pressure of the valves 3 and 4 is adjusted). The reason is that the solenoid of the valve 5 is energized, and the pressure regulating valve 4 is suddenly connected to the system and oscillates. As shown in FIG. 4, the valve 5 is connected after the valve 4, and the solenoid 4 is connected to the system oil pressure before the electromagnet is energized, so it will not cause an impact during the switching process.



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