Constant-diameter spindle assembly for numerically controlled machine tools

Abstract

The utility model discloses a kind of equal-diameter main shaft assemblies for numerical control machine tool, including main shaft body, including main shaft, the middle part of main shaft is sleeved with a double-layer steel sleeve, main shaft is located at the both sides of double-layer steel sleeve respectively and is sleeved with front corner contact bearing and rear corner contact bearing, main shaft is located at the side of rear corner contact bearing away from double-layer steel sleeve and is also sleeved with rear steel sleeve.The utility model is adopted to be set with the same diameter of main shaft and sleeve, so that the diameter of entire main shaft assembly is consistent, so as to be suitable for various different numerical control machine tools, and because the side of main shaft away from pulley is formed with convex ring, and front corner contact bearing has 4 corner contact bearings, rear corner contact bearing has 2 corner contact bearings, further balance the front and rear weight ratio of the utility model.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tools, and in particular to a constant diameter spindle assembly for CNC machine tools. Background Technology

[0002] Most existing CNC machine tool grinding heads are larger in the middle and smaller at both ends. This not only easily leads to mismatch problems, but also causes unnecessary mechanical vibration during use due to weight imbalance, thus affecting the yield rate. Furthermore, the vibration affects the overall sealing of the spindle, further impacting its service life. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, the technical solution adopted by this utility model to solve the technical problem is as follows: A CNC machine tool equal-diameter spindle assembly is provided, including a spindle body, a spindle, a double-layer steel sleeve fitted in the middle of the spindle, a front angular contact bearing and a rear angular contact bearing respectively fitted on both sides of the double-layer steel sleeve, a rear steel sleeve fitted on the side of the spindle away from the double-layer steel sleeve, a rear pressure cap fitted between the rear angular contact bearing and the rear steel sleeve, a sleeve fitted on the outer side of the double-layer steel sleeve, one end of the sleeve extending to the rear pressure cap, the other end of the sleeve extending to the end of the front angular contact bearing away from the double-layer steel sleeve, an annular step formed at the position of the sleeve at the front angular contact bearing, and the annular step extending vertically inward to the position of the spindle, a slot with an E-shaped cross-section formed on the side wall of the annular step away from the front angular contact bearing, a protruding ring formed at the position of the spindle facing the annular step, and a groove formed on the side wall of the protruding ring facing the annular step that fits with the slot.

[0005] Preferably, the outer wall of the rear pressure cover is formed with multiple annular guide grooves, and the inner wall of the sleeve located near the rear pressure cover is also formed with multiple annular guide grooves. This further improves the sealing performance of the sleeve, ensuring excellent sealing even when the spindle rotates at high speed.

[0006] Preferably, a groove is formed on the side wall of the rear cover facing the rear steel sleeve, and a flange that matches the groove is formed on the side wall of the rear steel sleeve facing the rear cover.

[0007] Preferably, the front angular contact bearing has a total of 4 angular contact bearings, and the rear angular contact bearing has a total of 2 angular contact bearings.

[0008] Preferably, a pulley is also fixedly fitted to the end of the main shaft located away from the double-layer steel sleeve at the rear steel sleeve.

[0009] Preferably, a spindle nut is also fixedly installed on the side of the spindle away from the rear steel sleeve.

[0010] Preferably, the main shaft has a nut fixing key formed on the side of the pulley near the rear steel sleeve.

[0011] Preferably, the end face of the spindle located away from the pulley also has a mounting hole formed.

[0012] The beneficial effects of this utility model are as follows: This utility model adopts the setting that the spindle and the sleeve have the same diameter, so that the front and rear diameters of the entire spindle assembly are consistent, thus making it suitable for various CNC machine tools. Furthermore, since the side of the spindle away from the pulley is formed with a convex ring, and there are a total of 4 angular contact bearings in the front angular contact bearing and a total of 2 angular contact bearings in the rear angular contact bearing, the front and rear weight ratio of this utility model is further balanced, thereby reducing vibration during use and improving the overall sealing performance. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention.

[0014] In the diagram: Sleeve 1; Front angular contact bearing 2; Rear angular contact bearing 21; Convex ring 3; Rear pressure cap 4; Inner steel sleeve 5; Outer steel sleeve 6; Rear steel sleeve 7; Pulley 8; Main spindle nut 9; Nut retaining key 10; Main spindle 11. Detailed Implementation

[0015] The present invention will be further described below with reference to embodiments, but is not limited to the contents of the specification.

[0016] Example 1: As Figure 1 As shown, the present invention aims to at least solve one of the technical problems existing in the prior art.

[0017] Therefore, the technical solution adopted by this utility model to solve the technical problem is: an assembly of a CNC machine tool equal-diameter spindle 11, including a spindle 11 body, a double-layer steel sleeve fitted in the middle of the spindle 11, a front angular contact bearing 2 and a rear angular contact bearing 21 respectively fitted on both sides of the double-layer steel sleeve, a rear steel sleeve 7 fitted on the side of the spindle 11 away from the double-layer steel sleeve, a rear pressure cap 4 fitted between the rear angular contact bearing 21 and the rear steel sleeve 7, and a... There is a sleeve 1, one end of which extends to the position of the rear pressure cover 4, and the other end of which extends to the position of the front angular contact bearing 2 away from the double-layer steel sleeve. The sleeve 1 at the position of the front angular contact bearing 2 is also formed with an annular step, and the annular step extends vertically inward to the position of the main shaft 11. The side wall of the annular step away from the front angular contact bearing 2 is formed with a bayonet with an E-shaped cross-section. The position of the main shaft 11 facing the annular step is formed with a protruding ring 3, and the side wall of the protruding ring 3 facing the annular step is formed with a groove that fits with the bayonet.

[0018] Multiple annular guide grooves are formed on the outer side wall of the rear cover 4, and multiple annular guide grooves are also formed on the inner side wall of the sleeve 1 located near the rear cover 4.

[0019] A groove is formed on the side wall of the rear pressure cover 4 facing the rear steel sleeve 7, and a flange that matches the groove is formed on the side wall of the rear steel sleeve 7 facing the rear pressure cover 4.

[0020] The front angular contact bearing 2 has a total of 4 angular contact bearings, and the rear angular contact bearing 21 has a total of 2 angular contact bearings.

[0021] The main shaft 11 is located at the end of the rear steel sleeve 7 away from the double-layer steel sleeve and is also fixedly sleeved with a pulley 8.

[0022] The main shaft 11 is located on the side of the pulley 8 away from the rear steel sleeve 7 and is also fixedly installed with a main shaft nut 9.

[0023] The main shaft 11 is located on the side of the pulley 8 near the rear steel sleeve 7 and also has a nut fixing key 10 formed thereon.

[0024] The spindle 11 has mounting holes formed on its end face at the end furthest from the pulley 8.

[0025] The double-layer steel sleeve includes an inner steel sleeve 5 and an outer steel sleeve 6. Lubricating oil is injected between the inner steel sleeve 5 and the outer steel sleeve 6. The inner sidewall of the inner steel sleeve 5 is in close contact with the outer sidewall of the main shaft 11, and the outer sidewall of the outer steel sleeve 6 is in close contact with the inner sidewall of the sleeve 1.

[0026] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the embodiments of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A constant-diameter spindle assembly for CNC machine tools, comprising a spindle body, characterized in that: The device includes a spindle, with a double-layered steel sleeve fitted in the middle. A front angular contact bearing and a rear angular contact bearing are fitted on either side of the double-layered steel sleeve. A rear steel sleeve is also fitted on the side of the spindle away from the double-layered steel sleeve, where the rear angular contact bearing is located. A rear pressure cap is fitted between the rear angular contact bearing and the rear steel sleeve. A sleeve is fitted on the outer side of the double-layered steel sleeve, with one end extending to the rear pressure cap and the other end extending to the end of the front angular contact bearing away from the double-layered steel sleeve. An annular step is formed at the position of the front angular contact bearing on the sleeve, extending vertically inward to the position of the spindle. An E-shaped notch is formed on the side wall of the annular step away from the front angular contact bearing. A convex ring is formed at the position of the spindle facing the annular step, with the outer diameter of the convex ring matching the outer diameter of the sleeve. A groove is formed on the side wall of the convex ring facing the annular step, fitting the notch.

2. The equal-diameter spindle assembly for CNC machine tools according to claim 1, characterized in that: Multiple annular guide grooves are formed on the outer side wall of the rear pressure cover, and multiple annular guide grooves are also formed on the inner side wall of the sleeve located near the rear pressure cover.

3. The equal-diameter spindle assembly for CNC machine tools according to claim 2, characterized in that: A groove is formed on the side wall of the rear pressure cover facing the rear steel sleeve, and a flange that matches the groove is formed on the side wall of the rear steel sleeve facing the rear pressure cover.

4. The equal-diameter spindle assembly for CNC machine tools according to claim 1, characterized in that: The front angular contact bearing has a total of 4 angular contact bearings, and the rear angular contact bearing has a total of 2 angular contact bearings.

5. The equal-diameter spindle assembly for CNC machine tools according to claim 1, characterized in that: The main shaft is located at the end of the rear steel sleeve away from the double-layer steel sleeve and is also fixedly fitted with a pulley.

6. The equal-diameter spindle assembly for CNC machine tools according to claim 5, characterized in that: The main shaft is located on the side of the pulley away from the rear steel sleeve and is also fixedly installed with a main shaft nut.

7. A constant-diameter spindle assembly for CNC machine tools according to claim 6, characterized in that: The main shaft is located on the side of the pulley near the rear steel sleeve and is also formed with a nut fixing key.

8. The equal-diameter spindle assembly for CNC machine tools according to claim 5, characterized in that: The spindle also has mounting holes formed on its end face at the end furthest from the pulley.

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