Nitrogen balance cylinder system for weight balance of machine tool

Abstract

The invention discloses a nitrogen balance cylinder system for weight balance of a machine tool. The nitrogen balance cylinder system comprises a nitrogen bottle, a controller and a nitrogen balancer; the controller is arranged on the nitrogen bottle; a servo motor is used for driving a ball screw to rotate so that a ball screw nut can drive a main shaft of the machine tool and the body of the nitrogen balancer to move up and down relative to a piston rod; when the main shaft of the machine tool moves up, the controller is capable of sending an instruction to open a gas charging valve, and the nitrogen bottle is capable of supplying nitrogen into the body of the nitrogen balancer; and when the main shaft of the machine tool moves down, the controller is capable of sending an instruction to close the gas charging valve and open a gas discharging valve. By the nitrogen balance cylinder system disclosed by the invention, the main shaft of the machine tool is more stable when moving up and down, and the servo motor is uniformly loaded when the main shaft of the machine tool moves up and down; the nitrogen balance cylinder system disclosed by the invention is capable of improving the stability of the motion process and improving the machining precision and the surface quality of a product, applicable to high-speed cutting, free of use of a power source and pipes, compact, small in floor space, small in pressure changes and stable in balance force.

Description

technical field [0001] The invention relates to a balance device, in particular to a nitrogen balance cylinder system used for counterweights of machine tools. Background technique [0002] A machine tool such as a machining center is provided with a main shaft and a main shaft assembly having an electric motor for rotationally driving the main shaft, and the main shaft assembly is supported and driven up and down by an elevating drive mechanism. This lifting drive mechanism is usually a ball screw, a ball nut screwed with the ball screw and connected to the main shaft assembly, and an electric motor, and the main shaft assembly and the ball nut are driven up and down together by the electric motor rotating the ball screw. . The heavy spindle assembly is supported and driven by the lifting drive mechanism. The load of the lifting drive mechanism is heavy, which may reduce the positional accuracy of the spindle assembly in the vertical direction, and it is difficult to furth...

AI Technical Summary

Problems solved by technology

The heavy spindle assembly is supported and driven by the lifting drive mechanism. The load on the lifting drive mechanism is heavy, which may reduce the position accuracy of the spindle assembly in the vertical direction, and it is difficult to further increase the lifting speed of the spindle assembly.

In addition, there is also the problem that the lifting drive mechanism supporting the heavy spindle assembly is enlarged and the production cost is high.

[0003] The traditional balancer in the prior art has: as figure 1 The problem of the balancer shown is that the response characteristics are poor, it is not suitable for high-speed cutting, and it takes up a lot of space; figure 2 The cylinder-type balancer shown has the problem that a large-diameter cylinder (easy to cause slipping) is required, a large-capacity air storage container is required, and a large-diameter pneumatic piping is required; image 3 The cylinder type balancer shown has the problem that a hydraulic unit and piping are required, and the oil temperature rise in the hydraulic circuit must be dealt with.

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