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        What if the hydraulic pressure of the gantry four column hydraulic press is clamped?
        Hits: 264  Time: 2020-09-14 16:05:44
         
        The friction resistance of reversing valve spool of gantry four column hydraulic press is mainly controlled by hydraulic clamping force. Due to the possible errors in the manufacturing and installation of the valve core and valve sleeve, there is coaxiality error between the valve core and the valve sleeve. When the oil film between the valve core and the valve sleeve is compressed, dry friction will occur between the metals, and this radial unbalanced force is specified. The valve core is difficult to move, which is called the hydraulic clamping phenomenon of four column hydraulic press.
        In order to make the reversing more reliable, it is necessary to ensure that the electromagnetic thrust is greater than the sum of the spring force and the friction force of the valve core to ensure the reliability of the reversing. In addition, the spring force must be greater than the friction resistance of the valve core to ensure the reliable reset.
        The hydraulic clamping phenomenon of slide valve of four column hydraulic press is not only found on the reversing valve, but also common in other hydraulic valves. In order to reduce the small-diameter force, a pressure equalizing groove with a width of 0.3-0.5 and a depth of about 0.5-1 is generally opened on the shoulder of the valve core. The position with the pressure equalizing groove has nearly equal pressure around, which can reduce the influence of the small-diameter force.
         
         
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