Why is the hydraulic bending machine so noisy? Does anyone know?
May 13,2022
Why is the hydraulic bending machine so noisy? Does anyone know? Please see the content below.
1. Excessive oil pump noise (overheating), oil pump damage, blockage, oil contamination, oil pump suction problems. Also check if the pump speed is too high. Select the motor speed according to the pump's specified higher speed.
2. Check if the oil viscosity is too high. Immediately replace the oil with the specified viscosity.
3. Check if the working pressure exceeds the rated pressure of the vane pump. At this pressure, there will be a loud bang.
4. Check if the stator is tightened and positioned. If the stator moves up and down, it will cause output flow pulsation, which in turn will generate noise. Therefore, the adjusting screw should be tightened.
5. There is an impact sound during rapid descent. This is caused by loose guide plates, incorrect position of the grating scale blackboard, or a too small time delay parameter setting before rapid descent.
Also, insufficient power of the hydraulic bending machine slider leads to slow return.
(1) The slider descends rapidly.
When the electromagnet is energized, the pressure oil output by the hydraulic pump enters the control chamber of the hydraulic check valve through the valve, and the oil in the lower chamber of the hydraulic cylinder flows back to the oil tank through the valve and throttle valve, and another path flows back to the oil tank. The slider rapidly descends under its own weight, and the volume vacated in the upper chamber of the hydraulic cylinder is replenished by the oil in the oil tank. At this time, the valve regulates the speed of the slider.
(2) The slider slows down.
When the slider descends to the upper die and approaches the bending plate material, the limit switch sends a signal to energize the electromagnet, closing the valve and returning the oil in the lower chamber of the hydraulic cylinder to the oil tank. After the pump outputs pressure oil through the reversing valve in the hydraulic control chamber and is energized. At the same time, due to energization, the oil pressure in the upper chamber of the hydraulic cylinder increases, and the right check valve disconnects the connection between the upper chamber of the hydraulic cylinder and the oil tank. In this way, the descent of the hydraulic cylinder can only be driven by the oil output by the pump to the upper chamber through the valve, and the movement speed of the slider can be adjusted.
(3) Pressure release
After the hydraulic bending machine completes its work, when the slider returns upward, the electromagnet is first cut off by the electrical system for 2s. During this period, due to power failure and valve reset, the overflow valve can be opened to reduce the pressure in the upper chamber of the hydraulic cylinder, achieving pre-unloading pressure.
(4) Pressurization
The working position of the electromagnet and valve remains unchanged. As the deformation resistance of the plate material increases, the pressure in the upper chamber of the hydraulic cylinder gradually increases until the slider moves to the predetermined position.
(5) Return of the slider.
After pressure release, the solenoid valve is de-energized, the pressure oil output by the hydraulic pump enters the lower chamber of the hydraulic cylinder, pushing the slider upward, and the oil in the upper chamber of the hydraulic cylinder flows back to the oil tank through the valve. The safety valve can regulate the hydraulic pressure.
If you want to learn more about hydraulic bending machines, please contact us. We can introduce them from different aspects. Let you have a better understanding of this industry.
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