A grinding wheel dresser electric spindle

Abstract

The utility model discloses an electric spindle for a grinding wheel dresser, comprising a spindle seat, wherein the front and rear ends of the spindle seat are respectively provided with a first mounting groove and a second mounting groove along the center line direction, the central axes of the first mounting groove and the second mounting groove are mutually penetrated with mounting through holes, a rotating mandrel is installed in the mounting through hole, the front end of the rotating mandrel extends to the first mounting groove in which a front bearing assembly is installed, and the rear end of the rotating mandrel extends to the second mounting groove in which a driving assembly and a rear bearing assembly are sequentially installed; the front end of the rotating mandrel extends to the outer side of the first mounting groove in which a tension sleeve is installed through a fixing piece; the electric spindle simplifies the overall structure of the grinding wheel dresser by integrating the conventional motor, bearing and spindle outer sleeve, greatly reduces the installation space of the grinding wheel dresser, and eliminates the original clamping mounting seat, so that the electric spindle can be directly installed on a workbench for use, and the installation is more convenient.

Description

Technical Field

[0001] The utility model relates to an electric spindle for a grinding wheel dresser, in particular to an electric spindle for a special grinding wheel dresser for a worm gear grinder, belonging to the technical field of grinding wheel dressing. Background Art

[0002] The tool commonly used for grinding grinding wheels is a grinding wheel dresser. By setting a grinding wheel dresser on a grinding machine to grind the grinding wheel, the grinding wheel can be re-adjusted to the required accuracy, which can effectively save the production cost of the enterprise. During the installation process of the spindle of the existing grinding wheel dresser, such as the existing Chinese invention patent with publication number CN104723220B, a semi-automatic double arc grinding wheel dresser is disclosed. In order to ensure the installation stability of the spindle, the spindle is clamped on the output shaft of the motor using a clamping mounting seat such as a bearing, a spindle jacket and a gland. The overall structure is complex, which makes it inconvenient to directly install the spindle on the workbench for use, greatly increasing the installation space. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide an electric spindle for a grinding wheel dresser to solve the technical problems mentioned in the prior art.

[0004] A grinding wheel dresser electric spindle, the electric spindle comprising a spindle seat, a first mounting groove and a second mounting groove are respectively arranged at the front and rear ends of the spindle seat along the center line direction, a mounting through hole is mutually penetrated on the central axis of the first mounting groove and the second mounting groove, a rotating spindle is installed in the mounting through hole, the front end of the rotating spindle extends to the first mounting groove and a front bearing assembly is installed therein, the rear end of the rotating spindle extends to the second mounting groove and a driving assembly and a rear bearing assembly are sequentially installed therein, the driving assembly is used to drive the rotating spindle to rotate, and the rotating spindle is guided and fixed during the rotation process by the front bearing assembly and the rear bearing assembly;

[0005] The front end of the rotating mandrel extends to the outer side of the first mounting groove and is installed with a tension sleeve through a fixing member. The tension sleeve is used to install a roller to grind and trim the surface of the grinding wheel.

[0006] Optionally, the structure of the rotating mandrel is stepped, and the rotating mandrel comprises a primary stepped shaft, a secondary stepped shaft, a tertiary stepped shaft, a quaternary stepped shaft and a quintuple stepped shaft, the shaft diameters of the primary stepped shaft, the secondary stepped shaft, the tertiary stepped shaft and the quaternary stepped shaft increase in sequence, and the shaft diameter of the quintuple stepped shaft is smaller than the shaft diameter of the quaternary stepped shaft, wherein:

[0007] The primary stepped shaft is used to mount the drive assembly and the rear bearing assembly;

[0008] The secondary stepped shaft and the tertiary stepped shaft are used to install the front bearing assembly;

[0009] The four-step stepped shaft is used to position and install the front bearing assembly and the tension sleeve;

[0010] The five-step stepped shaft is used for installing the tension sleeve.

[0011] Optionally, the front bearing assembly comprises:

[0012] A plurality of front bearings, wherein the inner liner rings of the plurality of front bearings are respectively mounted on the three-stage stepped shaft, and the outer liner rings of the plurality of front bearings are respectively connected to the side walls of the first mounting groove;

[0013] A front end cover, the front end cover is mounted on the three-step shaft, one end of the front end cover is mounted on the front end surface of the spindle seat to press a plurality of front bearings into the first mounting groove, and the other end of the front end cover is connected to the end surface of the four-step shaft;

[0014] A positioning ring, the positioning ring is installed on the three-stage stepped shaft, and at least one positioning ring is arranged between the opposite surfaces of two adjacent front bearings;

[0015] A clamping ring, the clamping ring is mounted on the three-stage stepped shaft, and the two ends of the clamping ring are respectively mounted on the front end cover and the opposite surface of the inner liner ring of the front bearing close to the front end cover;

[0016] A locking nut, wherein the inner thread of the locking nut is installed on the secondary stepped shaft, the outer thread of the locking nut is rotatably installed in the mounting through hole, and one end of the locking nut close to the first mounting groove is connected to the inner liner ring of the front bearing.

[0017] Optionally, the driving assembly comprises:

[0018] A rotor sleeve, wherein the rotor sleeve is mounted on the primary stepped shaft, and two ends of the rotor sleeve are respectively abutted against opposite surfaces of the secondary stepped shaft and the rear bearing assembly;

[0019] A rotor, the rotor being mounted on the outer circumference of the rotor sleeve;

[0020] A stator, the stator being mounted on the outer peripheral side of the rotor;

[0021] an electromagnetic induction coil, the electromagnetic induction coil being wound around the outer circumference of the stator;

[0022] A control box is installed on the spindle seat, the control box is connected to the electromagnetic induction coil, and the control box is used to connect the electromagnetic induction coil to an external power supply.

[0023] Optionally, the fixing member includes:

[0024] A pressing plate, the pressing plate is mounted on an end of the tension sleeve away from the four-step shaft;

[0025] A fastening bolt, wherein the fastening bolt is arranged at one end of the pressure plate away from the rotating core shaft, one end of the screw rod of the fastening bolt passes through the pressure plate and is threadedly connected to the five-step stepped shaft, and is used to press the pressure plate onto the tensioning sleeve to fix the roller when tightening the fastening bolt, and the pressure plate and the five-step stepped shaft do not contact each other.

[0026] Optionally, the rear bearing assembly comprises:

[0027] A bearing seat, the outer periphery of which is mounted on the side wall of the second mounting groove, one end of the bearing seat is provided with a limiting portion, the limiting portion is mounted on the rotor sleeve, the other end of the bearing seat extends to the outside of the spindle seat and is provided with a mounting portion, the mounting portion is mounted on the rear end surface of the spindle seat;

[0028] A rear bearing, wherein the inner liner ring of the rear bearing is mounted on the primary stepped shaft, and the outer liner ring of the rear bearing is mounted on the inner side wall of the bearing seat;

[0029] A rear end cover, wherein the rear end cover is mounted on the mounting portion of the bearing seat, and a fixing ring is provided at one end of the rear end cover close to the rear bearing, and the fixing ring is threadedly mounted on the primary stepped shaft, and is used for screwing the fixing ring toward the side close to the rear bearing to press the rear bearing onto the limiting portion, and allowing the rear bearing to squeeze the end of the rotor sleeve to be flush with the adjacent end of the limiting portion.

[0030] Optionally, multiple groups of cooling pipes are evenly arranged in the circumferential direction on the spindle seat, and both ends of the multiple groups of cooling pipes respectively pass through the front and rear ends of the spindle seat, and the multiple groups of cooling pipes are connected to each other. At least one liquid inlet and one liquid outlet are arranged on the top of the spindle seat, and the liquid inlet and the liquid outlet are both connected to the cooling pipes.

[0031] Optionally, the number of the liquid inlet is one, and the number of the liquid outlet is two.

[0032] Optionally, a plurality of mounting holes are arranged on the outer circumference of the spindle seat, and the mounting holes are not connected with the first mounting groove, the second mounting groove, the mounting through hole and the cooling pipeline.

[0033] Optionally, sealing plugs are respectively installed at both ends of the cooling pipeline.

[0034] The beneficial effects that the utility model can produce include:

[0035] The utility model provides an electric spindle for a grinding wheel dresser, which simplifies the overall structure of the grinding wheel dresser by integrating the previous motor, bearings and spindle housing, greatly reduces the installation space of the grinding wheel dresser, and eliminates the original clamping mounting seat, so that the electric spindle can be directly installed on the workbench for use, and the installation is more convenient; at the same time, the grinding wheel and other tools are installed by tightening the tightening sleeve, which is quick to install and easy to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of an electric spindle of a grinding wheel dresser of the utility model;

[0037] Figure 2 For the utility model Figure 1 Sectional view at AA where the upper assembly is equipped with rollers;

[0038] Figure 3 For the utility model Figure 1 The structural diagram of the spindle seat;

[0039] Figure 4 For the utility model Figure 2 A schematic diagram of the structure of a rotating mandrel;

[0040] In the figure: 1, spindle seat, 2, first mounting groove, 3, second mounting groove, 4, mounting through hole, 5, rotating mandrel, 6, tension sleeve, 7, first step shaft, 8, second step shaft, 9, third step shaft, 10, fourth step shaft, 11, fifth step shaft, 12, front bearing, 13, front end cover, 14, positioning ring, 15, clamping ring, 16, locking nut, 17, rotor sleeve, 18, rotor, 19, stator, 20, electromagnetic induction coil, 21, control box, 22, pressure plate, 23, fastening bolt, 24, bearing seat, 25, limiting part, 26, mounting part, 27, rear bearing, 28, rear end cover, 29, cooling pipeline, 30, liquid inlet, 31, liquid outlet, 32, mounting hole, 33, sealing plug, 34, fixing ring, 35, roller. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0042] like Figure 1-Figure 4As shown, the utility model provides an electric spindle for a grinding wheel dresser, the electric spindle comprises a spindle seat 1, a first mounting groove 2 and a second mounting groove 3 are respectively provided at the front and rear ends of the spindle seat 1 along the center line direction, a mounting through hole 4 is mutually penetrated on the central axis of the first mounting groove 2 and the second mounting groove 3, a rotating mandrel 5 is installed in the mounting through hole 4, the front end of the rotating mandrel 5 extends to the first mounting groove 2 where a front bearing assembly is installed, the rear end of the rotating mandrel 5 extends to the second mounting groove 3 where a driving assembly and a rear bearing assembly are sequentially installed, the driving assembly is used to drive the rotating mandrel 5 to rotate, and the rotating mandrel is rotated by the front bearing assembly and the rear bearing assembly 5 is guided and fixed during the rotation process; the front end of the rotating mandrel 5 extends to the outer side of the first installation groove 2 and is installed with a tension sleeve 6 through a fixing piece, and the tension sleeve 6 is used to install a roller 35 to grind and dress the surface of the grinding wheel; the electric spindle integrates the previous motor, bearing and spindle housing, thereby simplifying the overall structure of the grinding wheel dresser, greatly reducing the installation space of the grinding wheel dresser, and eliminating the original clamping mounting seat, so that the electric spindle can be directly installed on the workbench for use, and the installation is more convenient; at the same time, the grinding wheel and other tools are installed by tightening the tension sleeve 6, which is quick to install and easy to replace.

[0043] Furthermore, the structure of the rotating core shaft 5 is stepped, and the rotating core shaft 5 includes a first-level stepped shaft 7, a second-level stepped shaft 8, a third-level stepped shaft 9, a fourth-level stepped shaft 10 and a fifth-level stepped shaft 11. The shaft diameters of the first-level stepped shaft 7, the second-level stepped shaft 8, the third-level stepped shaft 9 and the fourth-level stepped shaft 10 increase successively, and the shaft diameter of the fifth-level stepped shaft 11 is smaller than the shaft diameter of the fourth-level stepped shaft 10, wherein: the first-level stepped shaft 7 is used to install the drive assembly and the rear bearing assembly; the second-level stepped shaft 8 and the third-level stepped shaft 9 are used to install the front bearing assembly; the fourth-level stepped shaft 10 is used to position and install the front bearing assembly and the tension sleeve 6; the fifth-level stepped shaft 11 is used to install the tension sleeve 6.

[0044] Further, the front bearing assembly comprises:

[0045] A plurality of front bearings 12, the inner liner rings of the plurality of front bearings 12 are respectively interference-mounted on the three-stage stepped shaft 9, and the outer liner rings of the plurality of front bearings 12 are respectively rotatably connected to the side walls of the first mounting groove 2;

[0046] The front end cover 13 is installed on the three-step shaft 9 with a gap, one end of the front end cover 13 is fixed on the front end surface of the spindle seat 1 by screws, and a plurality of front bearings 12 are pressed into the first installation groove 2, and the other end of the front end cover 13 is pressed on the end surface of the four-step shaft 10;

[0047] A positioning ring 14, which is sleeved on the three-stage stepped shaft 9, and at least one positioning ring 14 is installed between the opposite surfaces of two adjacent front bearings 12;

[0048] A clamping ring 15 is installed on the three-stage stepped shaft 9 with a gap, and the two ends of the clamping ring 15 are respectively installed on the front end cover 13 and the opposite surface of the inner liner ring of the front bearing 12 close to the front end cover 13, and is used to tighten the front end cover 13 on the end surface of the four-stage stepped shaft 10;

[0049] The locking nut 16 has an inner thread mounted on the secondary stepped shaft 8 , an outer thread of the locking nut 16 is rotatably mounted in the mounting through hole 4 , and one end of the locking nut 16 close to the first mounting groove 2 is crimped onto the inner liner ring of the front bearing 12 .

[0050] In the above, when assembling the front bearing assembly and the rotating spindle 5, first place the first-level stepped shaft 7 of the rotating spindle 5 vertically upward, and then insert the front end cover 13, the clamping ring 15, the front bearing 12 and the positioning ring 14 from one end of the first-level stepped shaft 7 to the third-level stepped shaft 9 in turn, wherein a positioning ring 14 is installed between two adjacent front bearings 12, and after adjusting the installation positions of the front end cover 13, the clamping ring 15, the front bearing 12 and the positioning ring 14 in turn, insert the locking nut 16 from one end of the first-level stepped shaft 7 to the second-level stepped shaft 8, and tighten the locking nut 16 to fix the front end cover 13, the clamping ring 15, the front bearing 12 and the positioning ring 14 between the fourth-level stepped shaft 10 and the locking nut 16, thereby installing the front bearing assembly on the rotating spindle 5, and then install the front bearing assembly and the rotating spindle 5 as a whole into the spindle seat 1, and fix the front end cover 13 on the front end surface of the spindle seat 1 by screws.

[0051] Furthermore, the drive assembly includes a rotor sleeve 17, a rotor 18, a stator 19, an electromagnetic induction coil 20 and a control box 21. The rotor sleeve 17 is interference mounted on the primary stepped shaft 7, and the two ends of the rotor sleeve 17 are respectively abutted against the opposite surfaces of the secondary stepped shaft 8 and the rear bearing assembly; the rotor 18 is interference mounted on the outer periphery of the rotor sleeve 17; the stator 19 is gap mounted on the outer peripheral side of the rotor 18; the electromagnetic induction coil 20 is wound on the outer periphery of the stator 19; wherein, the control box 21 adopts a frequency converter, the control box 21 is fixedly mounted on the spindle seat 1, the control box 21 is connected to the electromagnetic induction coil 20, and the control box 21 is used to connect the electromagnetic induction coil 20 to an external power supply; after the current bearing assembly and the rotating core shaft 5 are installed, the rotor sleeve 17, the rotor 18 and the stator 19 wound with the electromagnetic induction coil 20 are installed on the rotating core shaft 5 in sequence, and the frequency converter is electrically connected to the electromagnetic induction coil 20.

[0052] Furthermore, the fixing member comprises:

[0053] A pressing plate 22, the pressing plate 22 is installed at one end of the tension sleeve 6 away from the four-step shaft 10;

[0054] The fastening bolt 23 is arranged at one end of the pressure plate 22 away from the rotating core shaft 5. One end of the screw of the fastening bolt 23 passes through the pressure plate 22 and is threadedly connected to the five-step stepped shaft 11. When the fastening bolt 23 is tightened, the pressure plate 22 is pressed against the tensioning sleeve 6 to fix the roller 35. The pressure plate 22 and the five-step stepped shaft 11 do not contact each other, which can ensure that the tensioning sleeve 6 can effectively fix the roller 35.

[0055] Further, the rear bearing assembly comprises:

[0056] The bearing seat 24, the outer periphery of the bearing seat 24 is slidably mounted on the side wall of the second mounting groove 3, one end of the bearing seat 24 is provided with a limiting portion 25, the limiting portion 25 is gap-mounted on the rotor sleeve 17, the other end of the bearing seat 24 extends to the outside of the main shaft seat 1 and is provided with a mounting portion 26, the mounting portion 26 is fixedly mounted on the rear end surface of the main shaft seat 1 by screws;

[0057] A rear bearing 27, wherein the inner liner ring of the rear bearing 27 is interference-mounted on the primary stepped shaft 7, and the outer liner ring of the rear bearing 27 is slidably mounted on the inner side wall of the bearing seat 24;

[0058] The rear end cover 28 is fixedly mounted on the mounting portion 26 of the bearing seat 24. A fixing ring 34 is provided at one end of the rear end cover 28 close to the rear bearing 27. The fixing ring 34 is threadedly mounted on the primary stepped shaft 7, and is used to screw the fixing ring 34 toward the side close to the rear bearing 27 to press the rear bearing 27 onto the limiting portion 25, and allow the rear bearing 27 to squeeze the end of the rotor sleeve 17 to be flush with the adjacent end of the limiting portion 25.

[0059] In the above, after the drive assembly is installed, the rear bearing assembly is assembled. First, the bearing seat 24 is fixedly installed on the main shaft seat 1, and then the rear bearing 27 is installed on the first-stage stepped shaft 7, and the rear bearing 27 is fixed by the fixing ring 34. Finally, the rear end cover 28 is fixedly installed on the bearing seat 24 to encapsulate the rear end of the main shaft seat 1.

[0060] Furthermore, multiple groups of cooling pipes 29 are evenly cast in the circumferential direction on the spindle seat 1, and both ends of the multiple groups of cooling pipes 29 respectively pass through the front and rear ends of the spindle seat 1, and the multiple groups of cooling pipes 29 are interconnected. At least one liquid inlet 30 and a liquid outlet 31 are provided on the top of the spindle seat 1, and the liquid inlet 30 and the liquid outlet 31 are both connected to the cooling pipe 29, which is used to integrate the cooling pipe 29 on the spindle seat 1, thereby further simplifying the overall structure of the grinding wheel dresser.

[0061] As a preferred mode of this embodiment, the number of the liquid inlet 30 is set to one, and the number of the liquid outlets 31 is set to two, so that the coolant of the electric spindle enters from one liquid inlet 30 and is discharged from two liquid outlets 31, thereby slowing down the flow rate of the coolant in the cooling pipeline 29, extending the heat exchange time of the coolant, and improving the cooling effect.

[0062] Furthermore, a plurality of mounting holes 32 are provided on the outer periphery of the spindle seat 1, and the mounting holes 32 are not connected with the first mounting groove 2, the second mounting groove 3, the mounting through hole 4 and the cooling pipeline 29, so as to directly mount the electric spindle on the work surface for use.

[0063] Furthermore, sealing plugs 33 are respectively installed at both ends of the cooling pipeline 29 to ensure the sealing of the cooling pipeline 29 .

[0064] The above are only several embodiments of the utility model, and do not limit the utility model in any form. Although the utility model is disclosed as above in the preferred embodiments, it is not used to limit the utility model. Any technician familiar with this profession, without departing from the scope of the technical solution of the utility model, makes slight changes or modifications using the technical contents disclosed above, which are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A grinding wheel dresser electric spindle, characterized in that: The electric spindle comprises a spindle seat (1), and a first mounting groove (2) and a second mounting groove (3) are respectively arranged at the front and rear ends of the spindle seat (1) along the center line direction; a mounting through hole (4) is mutually penetrated on the central axis of the first mounting groove (2) and the second mounting groove (3); a rotating core shaft (5) is installed in the mounting through hole (4); the front end of the rotating core shaft (5) extends to the first mounting groove (2) and is installed with a front bearing assembly; the rear end of the rotating core shaft (5) extends to the second mounting groove (3) and is sequentially installed with a driving assembly and a rear bearing assembly; the driving assembly is used to drive the rotating core shaft (5) to rotate, and guide and fix the rotating core shaft (5) during the rotation process through the front bearing assembly and the rear bearing assembly; The front end of the rotating mandrel (5) extends to the outside of the first mounting groove (2) and is installed with a tension sleeve (6) through a fixing member. The tension sleeve (6) is used to install a roller (35) to grind and trim the surface of the grinding wheel.

2. The electric spindle for a grinding wheel dresser according to claim 1, characterized in that: The rotating mandrel (5) has a stepped structure, and comprises a primary stepped shaft (7), a secondary stepped shaft (8), a tertiary stepped shaft (9), a quaternary stepped shaft (10) and a quintuple stepped shaft (11). The shaft diameters of the primary stepped shaft (7), the secondary stepped shaft (8), the tertiary stepped shaft (9) and the quaternary stepped shaft (10) increase in sequence, and the shaft diameter of the quintuple stepped shaft (11) is smaller than the shaft diameter of the quaternary stepped shaft (10), wherein: The primary stepped shaft (7) is used to mount the drive assembly and the rear bearing assembly; The secondary stepped shaft (8) and the tertiary stepped shaft (9) are used to install the front bearing assembly; The four-step stepped shaft (10) is used to position and install the front bearing assembly and the tension sleeve (6); The five-step stepped shaft (11) is used for installing the tension sleeve (6).

3. The electric spindle for a grinding wheel dresser according to claim 2, characterized in that: The front bearing assembly comprises: A plurality of front bearings (12), the inner lining rings of the plurality of front bearings (12) being respectively mounted on the three-stage stepped shaft (9), and the outer lining rings of the plurality of front bearings (12) being respectively connected to the side walls of the first mounting groove (2); A front end cover (13), the front end cover (13) is mounted on the three-step stepped shaft (9), one end of the front end cover (13) is mounted on the front end surface of the spindle seat (1) to press a plurality of front bearings (12) into the first mounting groove (2), and the other end of the front end cover (13) is connected to the end surface of the four-step stepped shaft (10); A positioning ring (14), the positioning ring (14) being mounted on the three-stage stepped shaft (9), and at least one positioning ring (14) being arranged between opposite surfaces of two adjacent front bearings (12); A clamping ring (15), the clamping ring (15) being mounted on the three-stage stepped shaft (9), and the two ends of the clamping ring (15) being respectively mounted on the front end cover (13) and the opposite surface of the inner liner ring of the front bearing (12) close to the front end cover (13); A locking nut (16), wherein the inner thread of the locking nut (16) is mounted on the secondary stepped shaft (8), the outer thread of the locking nut (16) is rotatably mounted in the mounting through hole (4), and the end of the locking nut (16) close to the first mounting groove (2) is connected to the inner liner ring of the front bearing (12).

4. The electric spindle for a grinding wheel dresser according to claim 2, characterized in that: The drive assembly comprises: a rotor sleeve (17), wherein the rotor sleeve (17) is mounted on the primary stepped shaft (7), one end of the rotor sleeve (17) is connected to the secondary stepped shaft (8), the other end of the rotor sleeve (17) is connected to the rear bearing assembly, and both ends of the rotor sleeve (17) are respectively abutted against opposite surfaces of the secondary stepped shaft (8) and the rear bearing assembly; a rotor (18), wherein the rotor (18) is mounted on the outer periphery of the rotor sleeve (17); a stator (19), the stator (19) being mounted on the outer peripheral side of the rotor (18); An electromagnetic induction coil (20), the electromagnetic induction coil (20) being wound around the outer circumference of the stator (19); A control box (21), the control box (21) being mounted on the spindle seat (1), the control box (21) being connected to the electromagnetic induction coil (20), and the control box (21) being used to connect the electromagnetic induction coil (20) to an external power source.

5. The electric spindle for a grinding wheel dresser according to claim 2, characterized in that: The fixing member comprises: A pressing plate (22), the pressing plate (22) being mounted on an end of the tension sleeve (6) away from the four-step stepped shaft (10); A fastening bolt (23), wherein the fastening bolt (23) is arranged at one end of the pressure plate (22) away from the rotating core shaft (5), and one end of the screw rod of the fastening bolt (23) passes through the pressure plate (22) and is threadedly connected to the five-step stepped shaft (11), and is used to press the pressure plate (22) onto the tensioning sleeve (6) to fix the roller (35) when tightening the fastening bolt (23), and the pressure plate (22) and the five-step stepped shaft (11) do not contact each other.

6. The electric spindle for a grinding wheel dresser according to claim 4, characterized in that: The rear bearing assembly comprises: A bearing seat (24), the outer periphery of the bearing seat (24) being mounted on the side wall of the second mounting groove (3), one end of the bearing seat (24) being provided with a limiting portion (25), the limiting portion (25) being mounted on the rotor sleeve (17), the other end of the bearing seat (24) extending to the outside of the main shaft seat (1) being provided with a mounting portion (26), the mounting portion (26) being mounted on the rear end surface of the main shaft seat (1); A rear bearing (27), wherein an inner liner ring of the rear bearing (27) is mounted on the primary stepped shaft (7), and an outer liner ring of the rear bearing (27) is mounted on the inner side wall of the bearing seat (24); A rear end cover (28), the rear end cover (28) being mounted on the mounting portion (26) of the bearing seat (24); a fixing ring (34) being provided at one end of the rear end cover (28) close to the rear bearing (27); the fixing ring (34) being threadedly mounted on the primary stepped shaft (7) and being used for screwing the fixing ring (34) toward the side close to the rear bearing (27) to press the rear bearing (27) onto the limiting portion (25), and allowing the rear bearing (27) to squeeze the end of the rotor sleeve (17) to be flush with the adjacent end of the limiting portion (25).

7. The electric spindle for a grinding wheel dresser according to claim 1, characterized in that: A plurality of groups of cooling pipelines (29) are evenly arranged in an annular direction on the spindle seat (1), the two ends of the plurality of groups of cooling pipelines (29) respectively pass through the front and rear ends of the spindle seat (1), and the plurality of groups of cooling pipelines (29) are interconnected. At least one liquid inlet (30) and one liquid outlet (31) are arranged on the top of the spindle seat (1), and the liquid inlet (30) and the liquid outlet (31) are both connected to the cooling pipeline (29).

8. The electric spindle for a grinding wheel dresser according to claim 7, characterized in that: The number of the liquid inlet (30) is one, and the number of the liquid outlet (31) is two.

9. The electric spindle for a grinding wheel dresser according to claim 7, characterized in that: A plurality of mounting holes (32) are provided on the outer periphery of the spindle seat (1); the mounting holes (32) are not connected to the first mounting groove (2), the second mounting groove (3), the mounting through hole (4) and the cooling pipeline (29).

10. The electric spindle for a grinding wheel dresser according to claim 7, characterized in that: Sealing plugs (33) are respectively installed at both ends of the cooling pipeline (29).

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