Servo main shaft feedback mechanism and numerical control machine tool

Abstract

The invention provides a servo main shaft feedback mechanism and a numerical control machine tool. The numerical control machine tool is provided with the servo main shaft feedback mechanism. The servo main shaft feedback mechanism comprises a main shaft, a driving device, a first shaft sleeve and a grating detection device, wherein the main shaft is rotatably installed on a base, and an axis of the main shaft is hollow; the driving device is in transmission connection with one end of the main shaft; one end of the first shaft sleeve is fixedly connected with one end, far away from the drivingdevice, of the main shaft, and the other end penetrates through an axis of the main shaft and extends to the other end of the main shaft; and the grating detection device is used for detecting rotation of one end, extending out of the main shaft, of the first shaft sleeve. The grating detection device in the servo main shaft feedback mechanism detects a rotation angle of the first shaft sleeve. When a working end or an executing end is installed at one end, away from the driving device, of the main shaft, the first shaft sleeve directly feeds back the rotating angle of the working end or theexecuting end, a problem that grating detection precision is affected by main shaft torsion can be effectively solved, and practicability is high.

Description

technical field [0001] The invention relates to the technical field of spindle transmission, in particular to a servo spindle feedback mechanism and a numerically controlled machine tool using the servo spindle feedback mechanism. Background technique [0002] Spindle transmission is one of the most important components in the mechanical field, especially in CNC machine tools. Such as Figure 4 As shown, the main shaft 200 is usually rotatably mounted on a base 100 through multiple sets of bearings, a working end (or execution end) that rotates synchronously with the main shaft 200 is provided at one end of the main shaft 200, and a Drive, drive the main shaft 200 to rotate through the drive, and then drive the working end (or execution end) to rotate. In order to precisely control the rotation angle of the working end (or execution end), a grating detection device 600 is generally installed at the end of the main shaft 200 away from the working end (or execution end), and ...

AI Technical Summary

Problems solved by technology

However, due to the heavy weight of the working end (or executing end), in the process of driving the working end (or executing end) to rotate through the main shaft 200, one end of the working end (or executing end) installed on the main shaft 200 is connected to the drive. There will be a certain twist at one end of the grating detection device 600, so the detection value of the grating detection device 600 is not consistent with the actual rotation angle of the working end (or execution end), and the rotation angle of the working end (or execution end) cannot be precisely controlled. In the CNC machine tool, the processing quality of the product will be affected, and even the working end (or executing end) of the spindle 200 will interfere with the working end (or executing end) of the other spindle 200.

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