Non-leakage balance oil cylinder in power failure

Abstract

The invention relates to a non-leakage balance oil cylinder in power failure, consisting of a balance oil cylinder and a compensation device. The compensation device consists of a compensation oil cylinder body 15, a piston 16, a push rod 12, a plug rod 9, a big spring 13, a small spring 19, a middle cylinder 14 and a limit sleeve 20, wherein the plug rod 9 is sleeved outside the push rod 12, andis arranged between the middle cylinder 14 and the compensation oil cylinder body 15; the big spring 13 is sleeved on the plug rod 9 in the middle cylinder 14; the piston 16 is sleeved on the plug rod 9 in the compensation oil cylinder body 15; and the small spring 19 and the limit sleeve 20 are arranged on the tail of the push rod 12. The non-leakage balance oil cylinder has the advantages that after a machine tool has a power failure, the compensation device immediately seals an oil cavity E of the balance oil cylinder under the action of the two springs to keep the pressure of hydraulic oil in the balance oil cavity E; and at the same time, the balance oil cylinder is compressed to compensate pressure and make up the pressure loss thereof so as to ensure the balance oil cylinder still leads a ram cannot slide down even the machine tool is powered off for long term.

Description

Technical field [0001] The invention relates to a component of a gantry machining center of a numerical control machine tool, in particular to a power-off non-leakage balance oil cylinder. Background technique [0002] The gantry machining center is used for rough and fine machining of large parts. It has the characteristics of strong bearing capacity, large stroke and high precision. It can perform various processes such as milling, boring, drilling, and tapping. It can be completed in sequence with only one clamping. It is also possible to perform three-dimensional processing of large molds through a process, with high efficiency and good processing accuracy. The spindle head of the gantry machining center is installed at the lower end of the ram, and the ram is placed inside the skateboard. The servo motor is driven by the ball screw to move up and down along the guide rail to complete the Z-axis cutting processing feed. Since the Z-axis feed of the ram is in a vertical downw...

AI Technical Summary

Problems solved by technology

[0005] 1. It takes a certain amount of time for the motor brake to hold the motor shaft tightly after the machine tool is powered off, and it also takes a certain amount of time for the cut-off valve to cut off the oil circuit. During this process, part of the oil will flow back into the oil tank, and the pressure of the oil cylinder will drop to a certain extent. , so that the balance force is lost. In this way, when the motor brake hugs the motor shaft, the ram will still have a certain amount of down due to its own weight, and the tool will damage the surface of the workpiece.

[0006] 2. When the machine tool is in a state of long-term power failure, the structure of the stop valve in the balance oil circuit determines that there is always a small amount of leakage, so that the oil pressure of the balance oil cylinder will continue to drop, and the balance force will become smaller and smaller, which will cause The ram continues to slide slowly, which changes the original position of the ram of the machine tool, which brings great inconvenience and safety hazards to the subsequent use of the machine tool

Although an accumulator can be added to the balance oil circuit to supplement the pressure of the hydraulic oil, it still cannot fundamentally solve the problem

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