Electric spindle of grinding machine

Abstract

The utility model relates to an electric spindle, in particular to a grinding machine electric spindle which comprises a motor sleeve and a rotating mandrel. A front bearing assembly, a rear bearing assembly, a motor stator and a motor rotor are installed in the motor sleeve. The motor stator is arranged on the outer side of the motor rotor, and the inner side of the motor rotor is bonded with the outer side of the rotating mandrel; the front bearing assembly and the rear bearing assembly are arranged at the front end and the rear end of the motor stator respectively, and the rotating mandrel sequentially penetrates through the rear bearing assembly, the motor rotor and the front bearing assembly. The front end of the motor sleeve is connected with a front end cover, the rear end of the motor sleeve is provided with a rear bearing seat, and the rear end of the motor sleeve is connected with a rear cover through the rear bearing seat; according to the utility model, a middle bearing dismounting link is omitted, so that the assembly precision and the dynamic balance precision of the main shaft are improved, and the machining precision of a grinding machine is improved.

Description

Technical Field

[0001] The utility model relates to an electric spindle, in particular to an electric spindle for a grinding machine. Background Art

[0002] The grinding machine spindle is a power device used in grinding machine equipment and can achieve precision machining. When installing the existing motor rotor, the motor stator rotor is installed first, and then as a whole, it is connected to the core shaft. Since the outer diameter of the motor rotor is very large, it exceeds the inner diameter of the front bearing. The diameter of the front bearing is smaller than the outer diameter of the motor rotor, which makes the assembly more complicated. It is necessary to remove the front bearing first and then do dynamic balancing. After the dynamic balancing is done, it is necessary to make marks and record the relative position of the motor rotor and the core shaft. After the dynamic balancing is completed, the front bearing is disassembled and assembled again, but the re-disassembly and re-assembly will affect the assembly accuracy of the spindle, resulting in inaccurate installation accuracy and dynamic balancing accuracy of the spindle, thereby reducing the machining accuracy of the grinder.

[0003] Therefore, it is necessary to design a grinding machine spindle that improves the above problems. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provide an electric spindle for a grinding machine.

[0005] The utility model provides a grinding machine electric spindle, comprising a motor sleeve and a rotating mandrel;

[0006] The motor sleeve is provided with a front bearing assembly, a rear bearing assembly, a motor stator and a motor rotor; the motor stator is arranged on the outside of the motor rotor, and the inside of the motor rotor is bonded to the outside of the rotating core shaft;

[0007] The front bearing assembly and the rear bearing assembly are respectively arranged at the front and rear ends of the motor stator, and the rotating core shaft passes through the rear bearing assembly, the motor rotor and the front bearing assembly in sequence;

[0008] The front end of the motor sleeve is connected to a front end cover, the rear end of the motor sleeve is installed with a rear bearing seat, and the rear end of the motor sleeve is connected to a rear cover via the rear bearing seat;

[0009] Further, the motor rotor comprises a plurality of rotor magnets uniformly distributed circumferentially on the rotating core shaft, the rotor magnets are tile-shaped, the inner sides of a plurality of the rotor magnets are bonded to the outer side of the rotating core shaft, the outer sides of a plurality of the rotor magnets are covered with carbon fiber sleeves, and the inner sides of the carbon fiber sleeves are bonded to the outer sides of the rotor magnets;

[0010] Furthermore, a first installation cavity for installing a front bearing assembly is provided at the center of the front end of the inner hole of the motor sleeve, a second installation cavity for installing a rear bearing seat is provided at the center of the rear end of the motor sleeve, and a third installation cavity for installing a motor stator and a motor rotor is provided between the first installation cavity and the second installation cavity;

[0011] Further, the front bearing assembly includes four front bearings arranged in sequence toward the rear cover, a front bearing spacer is installed between two of the front bearings, and two of the front bearings are installed back to back;

[0012] Further, the rear bearing assembly includes two rear bearings arranged in sequence toward the rear cover, a rear bearing spacer is installed between the two rear bearings, and the two rear bearings and the rear bearing spacer are installed in the rear bearing seat;

[0013] Furthermore, the front and rear ends of the front bearing spacer are respectively concave toward one side of the rotating mandrel to form a first step opening;

[0014] Furthermore, the front and rear ends of the rear bearing spacer are respectively concave toward one side of the rotating mandrel to form a second step opening;

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) The inner side of the motor rotor of the utility model is bonded to the outer side of the rotating core shaft. The inner side of the motor rotor includes a plurality of rotor magnetic steels, which are bonded to the outer side of the rotating core shaft to form an integral structure. After the electric spindle of the grinding machine is dynamically balanced, the steps of making marks and reassembling the two are omitted, thereby ensuring the assembly accuracy of the spindle. The front bearing assembly is installed at the front end of the motor sleeve, eliminating the step of disassembling the bearing in the middle, thereby improving the assembly accuracy of the spindle and its dynamic balancing accuracy, thereby improving the processing accuracy of the grinding machine;

[0017] (2) The four front bearings in the front bearing assembly of the utility model are used in pairs and installed back to back at the front end of the inner hole of the motor sleeve, thereby reducing the installation dimension chain and ensuring the accuracy of the grinder electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only used to illustrate and explain the present invention, and are not intended to limit the scope of the present invention, wherein:

[0019] Figure 1 : A schematic diagram of the structure of the electric spindle of the grinding machine of the utility model;

[0020] Figure 2 : Schematic diagram of the assembly of the rotating mandrel and the motor rotor of the utility model;

[0021] Figure 3 : Sectional view of the rotor of the motor of the utility model at AA;

[0022] Figure 4 : Schematic diagram of the rotor magnetic steel structure of the utility model;

[0023] In the figure: 1-motor sleeve, 2-front bearing assembly, 3-rear bearing assembly, 4-motor stator, 5-motor rotor, 6-rotating mandrel, 7-front end cover, 8-rear bearing seat, 9-locking nut, 10-rear cover, 11-rotor magnet, 12-carbon fiber sleeve, 20-front bearing, 21-front bearing spacer, 30-rear bearing, 31-rear bearing spacer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution, design method and advantages of the utility model clearer, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] like Figure 1-Figure 4 As shown, the utility model provides a grinding machine electric spindle, including a motor sleeve 1 and a rotating mandrel 6;

[0026] A front bearing assembly 2, a rear bearing assembly 3, a motor stator 4 and a motor rotor 5 are installed in the motor sleeve 1. The motor stator 4 is arranged on the outside of the motor rotor 5, and the inner side of the motor rotor 5 is bonded to the outer side of the rotating core shaft 6; the front bearing assembly 2 and the rear bearing assembly 3 are respectively arranged at the front and rear ends of the motor stator 4, and the rotating core shaft 6 passes through the rear bearing assembly 3, the motor rotor 5 and the front bearing assembly 2 in sequence; the front end of the motor sleeve 1 is connected with a front end cover 7, the rear end of the motor sleeve 1 is installed with a rear bearing seat 8, and the rear end of the motor sleeve 1 is connected with a rear cover 10 via the rear bearing seat 8;

[0027] It should be noted that, since the inner side of the motor rotor 5 is bonded to the outer side of the rotating core shaft 6, the installation space of the motor is reduced, and at the same time, the volume of the product is reduced. After the dynamic balancing of the electric spindle of the grinding machine is completed, there will be no relative position movement between the motor rotor 5 and the rotating core shaft 6. Therefore, when the spindle of the grinding machine is dynamically balanced, there is no need to mark and record the relative position of the motor rotor 5 and the rotating core shaft 6 before, which eliminates the steps of marking and reassembling the two, thereby ensuring the assembly accuracy of the spindle. The motor sleeve 1 of the present application adopts an integrated design of the sleeve and the bearing seat, eliminating the separate design of the front bearing seat, and at the same time eliminating the space for installing the motor sleeve and the front bearing seat. The four front bearings can be installed from one end of the motor sleeve, eliminating the step of disassembling the bearings in the middle, thereby improving the assembly accuracy and dynamic balancing accuracy of the spindle, and improving the processing accuracy of the grinding machine.

[0028] In the above structure, based on the cooperation between the motor stator 4 and the motor rotor 5, the electric spindle has high rigidity and high precision driving capability, and at the same time, under the action of the front bearing assembly 2 and the rear bearing assembly 3, the motor rotor 5 is ensured to run with high precision;

[0029] The front end of the motor sleeve 1 is connected to the front end cover 7 through a first connecting piece, the rear end of the motor sleeve 1 is installed with a rear bearing seat 8, and the rear end of the motor sleeve 1 is connected to the rear cover 10 through the rear bearing seat 8 through a second connecting piece; the first connecting piece is a locking nut 9, and the second connecting piece is a countersunk bolt;

[0030] Among them, the motor stator 4 is a cylindrical structure of the prior art, which is sold in large quantities on the market, the rotating mandrel 6 is an existing columnar spindle structure, the front end cover 7 is an annular structure end cover in the prior art, the rear cover 10 is a cylindrical cover plate in the prior art, and a mounting cavity is provided at the center of the cylindrical cover plate; the rear bearing seat 8 is an annular structure mounting seat in the prior art;

[0031] Further, the motor rotor 5 includes a plurality of rotor magnets 11 uniformly distributed circumferentially on the rotating core shaft 6, the rotor magnets 11 are tile-shaped, the inner sides of the plurality of rotor magnets 11 are bonded to the outer side of the rotating core shaft 6, the outer sides of the plurality of rotor magnets 11 are covered with carbon fiber sleeves 12, and the inner sides of the carbon fiber sleeves 12 are bonded to the outer sides of the rotor magnets 11;

[0032] It should be noted that the motor rotor 5, including the inner sides of the plurality of rotor magnets 11, are bonded to the outer sides of the rotating mandrel 6 to form an integral structure. After the dynamic balancing measurement and analysis is completed, there will be no relative position movement between the motor rotor 5 and the rotating mandrel 6. Therefore, after the dynamic balancing of the grinding machine spindle is completed, it is not necessary to mark and record the relative positions of the motor rotor 5 and the rotating mandrel 6, thus eliminating the need for marking and reassembling the two.

[0033] Furthermore, a first installation cavity for installing the front bearing assembly 2 is provided at the center of the front end of the inner hole of the motor sleeve 1, a second installation cavity for installing the rear bearing seat 8 is provided at the center of the rear end of the motor sleeve 1, and a third installation cavity for installing the motor stator 4 and the motor rotor 5 is connected between the first installation cavity and the second installation cavity;

[0034] It should be noted that, since the motor sleeve 1 is an integrated design, the separate design of the front bearing seat is omitted, and the installation space between the motor sleeve and the front bearing seat is omitted. The four front bearings can be installed from one end of the motor sleeve, eliminating the link of disassembling the bearings in the middle, thereby improving the assembly accuracy of the spindle and its dynamic balancing accuracy, so that the processing accuracy of the grinder is improved;

[0035] Furthermore, the front bearing assembly 2 includes four front bearings 20 arranged in sequence toward the rear cover 10, a front bearing spacer 21 is installed between two of the front bearings 20, and two of the front bearings 20 are installed back to back;

[0036] It should be noted that in the above structure, four front bearings are used at the front end of the motor rotor 5, which greatly improves the rigidity of the spindle, while the two rear bearings at the rear end of the motor rotor 5 only play a supporting role and will not affect the spindle accuracy;

[0037] Further, the rear bearing assembly 3 includes two rear bearings 30 arranged in sequence toward the rear cover 10, a rear bearing spacer 31 is installed between the two rear bearings 30, and the two rear bearings 30 and the rear bearing spacer 31 are installed in the rear bearing seat 8;

[0038] Furthermore, the front and rear ends of the front bearing spacer 21 are respectively concave toward one side of the rotating mandrel to form a first step opening;

[0039] Furthermore, the front and rear ends of the rear bearing spacer 31 are respectively concave toward one side of the rotating mandrel to form a second step opening;

[0040] It should be noted that steps are provided on the front bearing spacer 21 and the rear bearing spacer 31 to prevent grease from accumulating forward and backward on the spindle after long-term use; the rear bearing spacer 31 and the front bearing spacer 21 are both annular bearing spacers in the prior art;

[0041] It is worth noting that the four front bearings 20 in the front bearing assembly 2 adopt a DBB combination method, and are used in pairs and installed back to back at the front end of the inner hole of the motor sleeve 1, which reduces the installation dimension chain and ensures the accuracy of the grinder electric spindle.

[0042] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A grinding machine electric spindle, characterized in that: including a motor sleeve and a rotating mandrel; A front bearing assembly, a rear bearing assembly, a motor stator and a motor rotor are installed in the motor sleeve; The motor stator is arranged on the outer side of the motor rotor, and the inner side of the motor rotor is bonded to the outer side of the rotating core shaft; The front bearing assembly and the rear bearing assembly are respectively arranged at the front and rear ends of the motor stator, and the rotating core shaft passes through the rear bearing assembly, the motor rotor and the front bearing assembly in sequence; The front end of the motor sleeve is connected with a front end cover, the rear end of the motor sleeve is installed with a rear bearing seat, and the rear end of the motor sleeve is connected with a rear cover via the rear bearing seat.

2. The electric spindle for a grinding machine according to claim 1, characterized in that: The motor rotor includes a plurality of rotor magnets uniformly distributed circumferentially on a rotating core shaft, wherein the rotor magnets are tile-shaped, and the inner sides of a plurality of the rotor magnets are bonded to the outer side of the rotating core shaft, and the outer sides of a plurality of the rotor magnets are covered with carbon fiber sleeves, and the inner sides of the carbon fiber sleeves are bonded to the outer sides of the rotor magnets.

3. The electric spindle for a grinding machine according to claim 1, characterized in that: A first installation cavity for installing a front bearing assembly is provided at the center of the front end of the inner hole of the motor sleeve, a second installation cavity for installing a rear bearing seat is provided at the center of the rear end of the motor sleeve, and a third installation cavity for installing a motor stator and a motor rotor is connected between the first installation cavity and the second installation cavity.

4. The electric spindle for a grinding machine according to claim 1, characterized in that: The front bearing assembly includes four front bearings arranged in sequence toward the rear cover, front bearing spacers are installed between two of the front bearings, and the two front bearings are installed back to back.

5. The electric spindle for a grinding machine according to claim 1, characterized in that: The rear bearing assembly includes two rear bearings arranged in sequence toward the rear cover, a rear bearing spacer is installed between the two rear bearings, and the two rear bearings and the rear bearing spacer are installed in the rear bearing seat.

6. The electric spindle for a grinding machine according to claim 4, characterized in that: The front and rear ends of the front bearing spacer are respectively concave toward one side of the rotating core shaft to form a first step opening.

7. The electric spindle for a grinding machine according to claim 5, characterized in that: The front and rear ends of the rear bearing spacer are respectively concave toward one side of the rotating core shaft to form a second step opening.

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