Special four-way coaxial valve for inner cooling of main shaft of machine tool

Abstract

The invention discloses a special four-way coaxial valve for inner cooling of a main shaft of a machine tool. Two-position two-way coaxial valve inserts are mounted below an assembly type valve blockthrough screws. A two-position three-way coaxial valve insert is mounted on the left side of the assembly type valve block through screws. A control air interface and a wiring terminal are arranged onthe two-position three-way coaxial valve insert. The two-position three-way coaxial valve insert communicates with the two-position two-way coaxial valve inserts through air pipes. The special four-way coaxial valve has the beneficial effects that the high-pressure four-way valve is used for synchronously solving the problems of frequent starting and stopping, overpressure unloading and multi-pressure switching of a high-pressure pump, the service life of the pump is prolonged, and the machining quality is improved; and the problems of long building time of inner cooling pressure and the processing beat is affected are solved; 2-3 seconds or more time can be saved during tool switching every time; the problems of positioning surface pollution and manipulator electronic element water soaking which are caused by main shaft hole internal residual pressure and water dripping during tool switching and part switching are effectively solved, and pressurized tool switching and other safety problems are avoided as well; and the working efficiency, the machining quality and the safety of the machine tool are improved.

Description

technical field [0001] The invention relates to the technical field of coaxial valves, in particular to a special four-way coaxial valve for internal cooling of machine tool spindles. Background technique [0002] The main shaft of the machining center passes through the internal cooling device, which is composed of a precision rotary joint, a high-pressure cooling device and a coolant filtering device. It is the preferred device for high-efficiency machining of CNC machine tools and long-term operation of the main shaft. It is filtered by a paper bag filter during machine tool processing. The coolant is lifted by the high-pressure pump, and the coolant is delivered to the tool handle through the through hole in the center of the spindle and sprayed out through the through hole on the tool handle and tool to achieve cooling of the tool and workpiece. The use of internal cooling tools can greatly improve the Machining efficiency and tool durability. [0003] However, in the ...

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Problems solved by technology

[0003] However, in the existing internal cooling method, the main power source of the coolant is a high-pressure lift pump, and during the processing of the machine tool, the unit internal cooling time is very short and the frequency is high, so the existing internal cooling technology has the following disadvantages :

[0004] (1) The high-pressure lift pump needs to be started and stopped frequently, which will increase the requirements for the use of the pump and increase the cost of actual operation;

[0005] (2) Due to the high frequency of internal cooling in actual processing, it is required to quickly establish the internal cooling pressure required by the machine tool to process workpieces in the pipeline. However, the only power source in the prior art is a high-pressure lift pump, and the pump is repeatedly started and stopped. It takes time to establish the pressure required for internal cooling, which affects the processing cycle and reduces the processing efficiency and quality of the machine tool;

[0006] (3) Due to the high pressure in the spindle during internal cooling, when the machine tool tool completes the internal cooling process, the high pressure in the spindle hole cannot be eliminated immediately, causing the machine tool to be changed under pressure, burying potential safety hazards

In addition, the high pressure in the spindle hole cannot be eliminated immediately. When replacing the parts, due to the pressure, water will appear at the end of the tool, which will cause the positioning surface of the workpiece to be polluted and the electronic components on the manipulator to be soaked in water, causing unnecessary damage. loss

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