Balance compensation structure and mode for three hanging points of spindle box

Abstract

The invention belongs to a balance compensation structure and a balance compensation mode suitable for a spindle box of a numerical control milling and boring machine with a ram. The balance compensation structure mainly comprises a balance and tilt compensation unit and a spindle box three-hanging-point mechanism, wherein the spindle box is provided with front, middle and rear hanging points; the three hanging points are connected with the gravity center of a balance weight through a connecting rope and a pulley group; compensation oil cylinders are arranged at the front and rear hanging points; and an oil circuit control device consisting of an electro-hydraulic proportional valve, a hydraulic control one-way valve and an electromagnetic reversing valve is arranged in front of each compensation oil cylinder. The balance compensation mode is that: a numerical control system measures the working condition of the ram in real time, and oil pressure in each oil cylinder is controlled by the electro-hydraulic proportional valve. By the balance compensation structure and the balance compensation mode, the inclination of the spindle box can be corrected in real time, the structure, the process and control are simple, and the movement accuracy of the ram of the milling and boring machine and the machining accuracy of a workpiece are ensured.

Description

[0001] Field: [0002] The invention belongs to a balance compensation structure and a balance compensation method of a spindle box, and is especially suitable for a numerically controlled floor type boring machine with a ram. Background technique: [0003] In the processing of modern large-scale machine tools, the movement of the ram of the large-scale machine tool is of great significance to the processing, such as the movement of the ram of the floor milling and boring machine, mainly because the end face of the ram has the function of installing accessories, and the movement of the ram is equivalent to the movement of the entire accessory. The attachment can be better approached or penetrated into the workpiece. Even if the attachment is not installed, only using the ram to move also expands the processing range of the machine tool. Due to the needs of the above processes, the movement stroke of the ram of the milling and boring machine is becoming larger and larger, and t...

AI Technical Summary

Problems solved by technology

However, the disadvantage is that because disc springs and pressure sensors are used to transmit dynamic information, this way of mechanically transmitting information has brought certain limitations to its sensitivity and response; Pillows need frequent and rapid reciprocating movements, which require the disc spring to quickly complete the compression and relaxation of small displacements, which affects the service life of the disc spring; at the same time, the compensation system does not take into account that the steel wire rope will be stretched under force during use. When the wire rope elongates, the pre-tightening force on the disc spring does not change at this time and cannot compensate the elongation of the wire rope. The elongation of the wire rope will make the spindle box deviate from the horizontal position; The pressure is zero, and there is no pre-tightening force on the disc spring, so it is difficult to ensure the correct horizontal position of the headstock, which affects the positioning accuracy

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