It is the main equipment of pipe bending processing, and numerical control technology is the core of the equipment. With the continuous development of various domestic construction, whether it is daily life or urban construction, the application of various pipeline products is inseparable. Affected by this, also made related products demand has greatly increased, so to develop the high-grade cnc pipe end forming machines automatic control system, to promote our country's equipment manufacturing core competitiveness, improve our country's comprehensive national strength has great significance.

(1) Unloading circuit

The circuit consists of an relief valve 4 and a two-position four-way solenoid valve 3. After starting the hydraulic pump, the two-position four-way solenoid valve 3 is in the unloading state under normal conditions, and the output of the hydraulic pump is all returned to the oil tank through the solenoid valve.

When the electromagnet 7YA is powered, the solenoid valve is reversed in the working state, and the relief valve 4 is adjusted to the working pressure. In order to facilitate valve selection, the circuit uses the way of blocking two-position four-way solenoid valve A and B to replace the two-position two-way valve, which is completely equivalent.

(2) Speed control loop

The speed control circuit adopts the inlet oil throttling speed regulation, easy to use the pressure relay to achieve pressure control; This speed regulation method has the characteristics of convenient adjustment and energy saving, the flow into the hydraulic cylinder is limited by the throttle valve, which can reduce the starting impact. When bending the pipe, the hydraulic cylinder is required to have a lower speed, and the inlet oil throttling speed can easily meet this requirement.

(3) Pressure retaining circuit

Double hydraulic control check valves 9, 10 and 11 are set in the loop respectively. When the solenoid valves 6, 7 and 8 in the loop are in the middle position, the hydraulic cylinder can maintain its pressure. In addition, considering the leakage problem of the hydraulic cylinder, the accumulator 16 and 19 are added in the circuit to compensate for its leakage. It should be noted that when selecting the solenoid directional valve, considering that the oil port of the double hydraulic control check valve control chamber can not have back pressure, the middle function of the solenoid valve must be selected as "Y" type, and the one-way throttle valve should be installed near the side of the cylinder.

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