Main spindle retraction mechanism

Abstract

The invention relates to a mainshaft cutter withdrawal mechanism which is characterized in that an air-hydraulic withdrawal power system comprises an air-hydraulic booster; a cutter withdrawal component comprises a high-pressure oil cylinder which is covered by a protection cover; one side of the high-pressure oil cylinder is provided with an oil pipe joint; the high-pressure oil cylinder at the lower side of the oil pipe joint is provided with an air pipe joint; the high-pressure oil cylinder is internally provided with a piston; the lower end of a piston rod of the piston and the upper end of a cutter arbor are provided with a certain distance; the piston is internally provided with a transverse perforated air passage and a longitudinal air passage which is communicated with the transverse air passage; the opening of the longitudinal air passage is arranged at the lower end of the piston rod; a section of piston rod between the piston and the bottom of the high-pressure oil cylinder is sheathed by a spring; the side wall of the bottom of the high-pressure oil cylinder is provided with an exhaust hole; the upper part of the cutter arbor is also provided with a section of longitudinal air passage with openings at the top; the lateral opening of the lower end of the longitudinal air passage is arranged between the cutter arbor and the mainshaft. In the invention, the mainshaft cutter withdrawal mechanism has the advantages of small volume, light weight, convenient and flexible layout, no influence on the appearance of the machine tool, convenient assembly and maintenance and low manufacturing cost.

Description

technical field [0001] The invention relates to drilling machines and drilling and milling machine equipment, in particular to one of the main shaft retracting mechanisms. Background technique [0002] The tool retracting action of the machine tool spindle is a key point involving production efficiency, safe operation, labor intensity and maintaining the accuracy of the spindle. After the advent of CNC machine tools, the tool retracting technology has been well resolved, but the retracting tool of the drilling machine or drilling and milling machine has been used. The actions of hand knocking, hand board, and hand punching have been tackled in the drilling machine industry as early as the 1980s. So far, there have been various mechanisms and methods of tool retraction, but they are all manual actions and have many defects. There are two reasons why the automatic broaching and retracting technology of drilling machine or drilling and milling machine is difficult to solve. The...

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Problems solved by technology

[0002] The tool retracting action of the machine tool spindle is a key point involving production efficiency, safe operation, labor intensity and maintaining the accuracy of the spindle. After the advent of CNC machine tools, the tool retracting technology has been well resolved, but the retracting tool of the drilling machine or drilling and milling machine has been used. The actions of hand knocking, hand board, and hand punching have been tackled in the drilling machine industry as early as the 1980s. So far, there have been various mechanisms and methods of tool retraction, but they are all manual actions and have many defects.

There are two reasons why the automatic broaching and retracting technology of drilling machine or drilling and milling machine is difficult to solve. The first is technical aspect. In the key sleeve, this requires that the diameter of the retracting cylinder assembly must be smaller than the diameter of the spindle spline, and must adapt to the two combined movements of the spindle, which is already very difficult in structure. In addition, the retracting cylinder is very small, reaching more than 1000kgf The tool withdrawal force must have high-pressure oil above 10Mpa, while the pressure of conventional gear oil pumps is only 2.5Mpa, which is impossible for drilling machines or drilling and milling machines; secondly, drilling machines or drilling and milling machines are ordinary machine tools, although automatic broaching is very necessary. But it is impossible to greatly increase the cost to improve this function. For example, in order to provide high-pressure oil source, it is necessary to configure high-pressure oil cylinder, high-power motor (its power may be greater than the main motor of the machine tool) and hydraulic system, which is not only expensive but also the volume of the device Very large, difficult to coordinate and assemble with the machine tool as a whole

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