MarketsHydraulic system in light industry and textile machinery

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    In addition to the hydraulic technology used in daily necessities manufacturing machinery and food machinery, hydraulic technology has also been widely used in many light industrial machinery such as watches, sugar, leather, furniture processing, and tableware manufacturing.

    The application of hydraulic technology in textile machinery, in addition to the use of hydraulic transmission in warping machines, looms, carding machines, etc., is common in most textile machinery pressurizing devices, braking devices, buffering devices, and speed regulating devices. Hydraulic technology is used.


The schematic diagram of the hydraulic system of the machine is shown in this picture. The oil source of the system is a variable hydraulic pump 1, and the actuator is a three-chamber (cavity a, b, c) composite cylinder 6 and a material ejection cylinder 5. The two-way cartridge valve Vi and Q2 constitute the differential oil circuit of the compound cylinder, and the system pressure is controlled by the cartridge valve V7 and the pilot relief valve 12. The direction of movement of the return cylinder is controlled by the electromagnetic reversing valve 11. In order to meet the high speed of hot stamping so as to analyze and improve the pressing process and mold, the system is additionally equipped with a pressure sensor and a digital transmission regulator (not shown in the figure).

(图1)

    The working cycle of the system and its principle are as follows:


    ① The hydraulic pump starts when the solenoid 1YA is energized to switch the directional valve 13 to the upper position, with a delay of 0.1s, and the hydraulic pump starts without load.

    ②The compound cylinder falls quickly. When the electromagnet 1YA is de-energized and the 2YA and 3YA are energized, the valve 13 is reset (lower position), the reversing valve 2 and 3 are switched to the upper position, and the pressure of pump 1 enters the compound through the cartridge valve% and V2. The oil in the small cavity a and b cavity of the cylinder is fed back to cavity a through the cartridge valves ¥3 and ¥2, and the composite cylinder forms a differential connection to drive the piston rod and the working mechanism to fall quickly: the oil in the oil tank 10 is controlled by the hydraulic The filling valve 9 fills the cavity c of the compound cylinder with fluid and oil.

    ③Stamping and forming When the follower sliding sleeve of the working mechanism touches the adjustable-position travel switch SQ1, the solenoid 3YA is de-energized to return the valve 3 to the lower position; the solenoids 2YA and 4YA are energized, and the reversing valves 2 and 4 are switched to In the upper and lower positions, the pressure oil enters the a and c chambers of the compound cylinder through the valves Vi, V2, and V4 respectively to realize the pressurization of the workpiece. The oil in cavity b returns to the oil tank through valve A. Send a message until the pressure is increased to the set pressure of the pressure transmitter. When the solenoids 2YA and 4YA are de-energized and the solenoids 2YA and 4YA are energized, valves 2 and 4 are reset and valve 3 is switched to the upper position. Pressure oil enters the b cavity of the composite cylinder through the cartridge valves Vi and v3, and pushes the piston rod to return ( Ascending), the oil in cavity a is drained from valve V5 back to the tank, and at the same time, the pressure oil opens the hydraulic charging valve 9 and the oil in cavity c is pressed back to the tank 10.

    ⑤After the return stroke of the return compound cylinder is in place, the follower sliding sleeve hits the travel switch SQ2, the electromagnet 3YA is de-energized, and the time relay controls the electromagnets 5YA and 6YA to be energized and de-energized successively, and the reversing valve 11 reverses the direction to make the return hydraulic pressure Cylinder 5 completes ejection, withdrawal and resetting.


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