Double-grinding-wheel electric spindle mechanism

Abstract

The utility model provides a double-grinding-wheel electric spindle mechanism, and belongs to the technical field of grinding machine equipment. A main shaft frame is arranged on one side of the box body, a stator sleeve is coaxially arranged at the middle end in the main shaft frame, a main shaft is coaxially and rotationally connected in the stator sleeve, a permanent magnet stator is arranged on the inner wall of the stator sleeve, and a permanent magnet rotor matched with the permanent magnet stator is arranged in the middle of the main shaft in a sleeving mode. A front rotating supporting assembly and a rear rotating supporting assembly are arranged between the front end and the rear end of the stator sleeve and the spindle respectively, a front flange cover and a rear flange cover are arranged between the front end and the rear end of the spindle frame and the spindle respectively, and a front grinding wheel assembly and a rear grinding wheel assembly are arranged at the two ends, extending out of the spindle frame, of the spindle respectively. Two machining procedures can be performed simultaneously or alternately during one-time clamping, so that the machining efficiency is remarkably improved; vibration and deformation generated in the high-speed rotating and machining process of the main shaft can be reduced, stable operation of the main shaft is guaranteed, the friction force of the main shaft is reduced, and high-efficiency and high-precision machining is achieved; any horizontal angle can be rotated, adjusted and positioned.

Description

Technical Field

[0001] The utility model belongs to the technical field of grinding machine equipment and relates to a double-grinding wheel electric spindle mechanism. Background Art

[0002] The grinding wheel shafts used in grinders are mostly driven by ordinary motors. A grinding wheel is set at one end of the grinding wheel shaft, and the other end is connected to the motor through a transmission device. This installation structure cannot install two grinding wheels for processing. The grinding wheel can only be installed at one end. In a period of time, only one workpiece can be processed. The grinding wheel structure used is relatively simple, the processing process is fixed, and the production efficiency is low. In addition, the existing spindle is subjected to large friction during rotation, which is easy to vibrate and has poor rotation accuracy. Utility Model Content

[0003] The purpose of the utility model is to provide a double-grinding wheel electric spindle mechanism in view of the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A dual-grinding-wheel electric spindle mechanism comprises a box body, a spindle frame is provided on one side of the box body, a stator sleeve is coaxially provided at the middle end of the spindle frame, a spindle is coaxially rotatably connected in the stator sleeve, a permanent magnet stator is provided on the inner wall of the stator sleeve, a permanent magnet rotor matching the permanent magnet stator is sleeved on the middle part of the spindle, a front rotating support assembly and a rear rotating support assembly are respectively provided between the front and rear ends of the stator sleeve and the spindle, a front flange cover and a rear flange cover are respectively provided between the front and rear ends of the spindle frame and the spindle, and a front grinding wheel assembly and a rear grinding wheel assembly are respectively provided on the two ends of the spindle extending out of the spindle frame.

[0006] The spindle is driven by electromagnetic action, which reduces the loss of energy transmission, improves energy utilization, and has higher rotation accuracy. The front grinding wheel assembly and the rear grinding wheel assembly at the front and rear ends of the spindle enable two processing steps to be performed simultaneously or alternately in one clamping, thereby significantly improving the processing efficiency. The front rotating support assembly and the rear rotating support assembly between the front and rear ends of the stator sleeve and the spindle support the weight of the spindle and bear the load from the spindle, which can reduce the vibration and deformation of the spindle during high-speed rotation and processing, ensure the stable operation of the spindle, and can effectively reduce the friction when the spindle rotates, realizing high-efficiency and high-precision processing.

[0007] In the above-mentioned dual-grinding wheel electric spindle mechanism, the front rotating support assembly includes a front bearing seat arranged on the inner wall of the front end of the stator sleeve, a plurality of front bearings are arranged at the front end of the spindle, and the front bearings abut against each other to form a front bearing group, the inner and outer rings of the front bearings abut against the outer surface of the front end of the spindle and the inner surface of the front bearing seat respectively, a front positioning structure is arranged between the inner end of the front bearing group and the spindle and the front bearing seat, and a front sealing structure is arranged at the outer end of the front bearing group.

[0008] The front bearing mounted on the front end of the spindle supports the weight of the spindle and bears the load from the spindle. It can reduce the vibration and deformation of the spindle during high-speed rotation and machining, ensure the stable operation of the spindle, and effectively reduce the friction when the spindle rotates. The front positioning structure and the front sealing structure cooperate to position and fix the front bearing group to prevent the front bearing from shifting and falling off. The front sealing structure also plays a sealing role to prevent external pollution from entering and internal lubricant from leaking.

[0009] In the above-mentioned dual-grinding wheel electric spindle mechanism, the front positioning structure includes a first positioning boss arranged on the inner end of the front bearing seat, a second positioning boss is provided on the front end of the spindle, and the inner ends of the inner and outer rings of the front bearing located at the innermost end of the spindle are respectively abutted against the second positioning boss and the first positioning boss.

[0010] The inner ends of the inner and outer rings of the innermost front bearing respectively abut against the second positioning boss and the first positioning boss, thereby achieving limited fixation of the inner end of the front bearing group, and the front bearing is firmly and reliably fixed.

[0011] In the above-mentioned dual-grinding wheel electric spindle mechanism, the front sealing structure includes a front sealing flange sleeved on the front end of the spindle, the front sealing flange is fixedly connected to the outer end of the front bearing seat, the inner end of the front sealing flange is provided with a third positioning boss and a front positioning groove, the front positioning groove is provided with a front seal, and the outer ends of the inner and outer rings of the front bearing located at the outermost end of the spindle are respectively abutted against the front seal and the third positioning boss.

[0012] The outer ends of the inner and outer rings of the outermost front bearing respectively abut against the front seal and the third positioning boss, and cooperate with the limiting fixation at the inner end of the front bearing group to achieve stable fixation of the front bearing group. The front bearing is firmly and reliably fixed without loosening or displacement, ensuring the stable operation of the main shaft. The front sealing flange plays a sealing role and has strong sealing performance.

[0013] In the above-mentioned dual-grinding wheel electric spindle mechanism, the rear rotating support assembly includes a rear bearing seat arranged on the inner wall of the rear end of the stator sleeve, and a plurality of rear bearings are arranged at the rear end of the spindle. The rear bearings abut against each other to form a rear bearing group. The inner and outer rings of the rear bearings abut against the outer surface of the rear end of the spindle and the inner surface of the rear bearing seat respectively. The inner end of the rear bearing group is unilaterally positioned by a positioning shoulder on the spindle, and the outer end of the rear bearing group is provided with a rear sealing structure.

[0014] The rear bearing mounted on the rear end of the spindle supports the weight of the spindle and bears the load from the spindle. It can reduce the vibration and deformation of the spindle during high-speed rotation and machining, ensure the stable operation of the spindle, and effectively reduce the friction when the spindle rotates. The rear sealing structure cooperates with the positioning shoulder on the spindle to position and fix the rear bearing group to prevent the rear bearing from shifting and falling off. The rear sealing structure also plays a sealing role to prevent external pollution from entering and internal lubricant from leaking.

[0015] In the above-mentioned dual-grinding wheel electric spindle mechanism, the rear sealing structure includes a rear sealing labyrinth flange sleeved on the rear end of the spindle, the rear sealing labyrinth flange is fixedly connected to the outer end of the rear bearing seat, and the outer end of the rear bearing group abuts against the inner end of the rear sealing labyrinth flange.

[0016] The outer end of the rear bearing group abuts against the inner end of the rear sealing labyrinth flange, and the inner end of the rear bearing group abuts against the positioning shoulder on the main shaft, thereby achieving a stable fixation of the rear bearing group. The rear bearing is firmly and reliably fixed without loosening or displacement, thereby ensuring the stable operation of the main shaft. The rear sealing labyrinth flange has the advantages of high sealing performance and zero leakage, and can maintain a stable sealing effect.

[0017] In the above-mentioned dual-grinding wheel electric spindle mechanism, the front grinding wheel assembly includes a front grinding wheel flange arranged on the front end of the spindle, the front grinding wheel flange includes a front shaft body and a front disk body coaxial with the spindle, a front fixing piece is provided at the outer end of the front shaft body, the inner surface of the front shaft body and the outer surface of the spindle are tightly fitted through a conical surface, a front positioning cover is provided at the outer end of the front shaft body, a front grinding wheel is provided between the front positioning cover and the front disk body, a front grinding wheel cover is provided outside the front grinding wheel, and the front grinding wheel cover is connected to the outer end of the front flange cover.

[0018] The front positioning cover cooperates with the front disc body to fix the front grinding wheel. The inner surface of the front shaft body and the outer surface of the spindle are tightly fitted through the conical surface to achieve high-precision positioning and firm fixation to ensure that the front grinding wheel will not have position deviation during rotation. The front fixing part at the outer end of the front shaft body plays a fixing role, and the front grinding wheel cover plays a protective role.

[0019] In the above-mentioned dual-grinding wheel electric spindle mechanism, the rear grinding wheel assembly includes a rear grinding wheel flange arranged on the rearmost end of the spindle, the rear grinding wheel flange includes a rear axle body and a rear disk body coaxial with the spindle, a rear fixing piece is provided at the inner end of the rear axle body, the inner surface of the rear axle body and the outer surface of the spindle are tightly fitted through a conical surface, a rear positioning cover is provided at the outer end of the rear axle body, a rear grinding wheel is provided between the rear positioning cover and the rear disk body, a rear grinding wheel cover is provided outside the rear grinding wheel, and the rear grinding wheel cover is connected to the outer end of the rear flange cover.

[0020] The rear positioning cover cooperates with the rear disc body to fix the rear grinding wheel. The inner surface of the rear axle body and the outer surface of the spindle are tightly fitted through the conical surface to achieve high-precision positioning and firm fixation to ensure that the rear grinding wheel will not have position deviation during rotation. The rear fixing part at the outer end of the rear axle body plays a fixing role, and the rear grinding wheel cover plays a protective role.

[0021] In the above-mentioned dual-grinding wheel electric spindle mechanism, the inner end of the front positioning cover and the outer end of the front disk body are respectively provided with a first front positioning step and a second front positioning step, and the inner and outer ends of the inner ring of the front grinding wheel respectively abut against the second front positioning step and the first front positioning step; the inner end of the rear positioning cover and the outer end of the rear disk body are respectively provided with a first rear positioning step and a second rear positioning step, and the inner and outer ends of the inner ring of the rear grinding wheel respectively abut against the second rear positioning step and the first rear positioning step.

[0022] The second front positioning step and the first front positioning step respectively play a role in positioning and fixing the inner and outer ends of the inner ring of the front grinding wheel to ensure stable fixation. The second rear positioning step and the first rear positioning step respectively play a role in positioning and fixing the inner and outer ends of the inner ring of the rear grinding wheel to ensure stable fixation.

[0023] In the above-mentioned dual-grinding wheel electric spindle mechanism, a high-precision turntable capable of driving the box to rotate horizontally is provided at the bottom end of the box.

[0024] The high-precision turntable at the bottom of the box can drive the box to rotate horizontally, and can be rotated and adjusted to any horizontal angle for easy processing.

[0025] Compared with the existing technology, the advantages of the utility model are: 1. Two processing steps can be carried out simultaneously or alternately in one clamping, thereby significantly improving the processing efficiency. 2. It can reduce the vibration and deformation of the spindle during high-speed rotation and processing, ensure the stable operation of the spindle, reduce the friction force on the spindle, and achieve high-efficiency and high-precision processing. 3. It can be rotated and adjusted at any angle horizontally to facilitate processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure provided by the utility model;

[0027] Figure 2 It is a cross-sectional view provided by the utility model;

[0028] Figure 3 It is a cross-sectional view of the main shaft;

[0029] Figure 4 It is a schematic diagram of the structure of the main shaft.

[0030] In the figure, box 1, spindle frame 2, stator sleeve 3, spindle 4, front rotating support assembly 5, rear rotating support assembly 6, front flange cover 7, rear flange cover 8, front grinding wheel assembly 9, rear grinding wheel assembly 10, front bearing seat 11, front bearing 12, front bearing group 13, front positioning structure 14, front sealing structure 15, first positioning boss 16, second positioning boss 17, front sealing flange 18, third positioning boss 19, front positioning groove 20, front seal 21, front sealing ring 22, rear bearing seat 23, rear bearing 24, positioning shoulder 2 5. Rear sealing structure 26, rear sealing labyrinth flange 27, rear bearing assembly 28, rear sealing ring 29, front grinding wheel flange 30, front axle body 31, front disc body 32, front positioning cover 33, front grinding wheel 34, front grinding wheel cover 35, front fixing part 36, rear grinding wheel flange 37, rear axle body 38, rear disc body 39, rear positioning cover 40, rear grinding wheel 41, rear grinding wheel cover 42, rear fixing part 43, first front positioning step 44, second front positioning step 45, first rear positioning step 46, second rear positioning step 47, high-precision turntable 48. DETAILED DESCRIPTION

[0031] like Figure 1-Figure 4 As shown, a dual-grinding wheel electric spindle mechanism comprises a box body 1, a spindle frame 2 is provided on one side of the box body 1, a stator sleeve 3 is coaxially provided at the middle end of the spindle frame 2, a spindle 4 is coaxially rotatably connected in the stator sleeve 3, a permanent magnet stator is provided on the inner wall of the stator sleeve 3, a permanent magnet rotor matched with the permanent magnet stator is sleeved on the middle part of the spindle 4, a front rotating support assembly 5 and a rear rotating support assembly 6 are respectively provided between the front and rear ends of the stator sleeve 3 and the spindle 4, a front flange cover 7 and a rear flange cover 8 are respectively provided between the front and rear ends of the spindle frame 2 and the spindle 4, and a front grinding wheel assembly 9 and a rear grinding wheel assembly 10 are respectively provided on the two ends of the spindle 4 extending out of the spindle frame 2.

[0032] In the utility model, the external frequency converter is started to drive the spindle 4 to rotate through the electromagnetic action of the permanent magnet stator in the stator sleeve 3 and the permanent magnet rotor on the spindle 4, thereby driving the front grinding wheel assembly 9 and the rear grinding wheel assembly 10 at both ends of the spindle 4 to operate, and multiple workpieces can be ground at the same time.

[0033] The spindle 4 is driven by electromagnetic action, which reduces the loss of energy transmission, improves energy utilization, and has higher rotation accuracy. The front grinding wheel assembly 9 and the rear grinding wheel assembly 10 at the front and rear ends of the spindle 4 enable two processing steps to be performed simultaneously or alternately in one clamping, thereby significantly improving the processing efficiency. The front rotating support assembly 5 and the rear rotating support assembly 6 between the front and rear ends of the stator sleeve 3 and the spindle 4 support the weight of the spindle 4 and bear the load from the spindle 4, which can reduce the vibration and deformation of the spindle 4 during high-speed rotation and processing, ensure the stable operation of the spindle 4, and can effectively reduce the friction force on the spindle 4 when it rotates, thereby realizing high-efficiency and high-precision processing.

[0034] Specifically, combined with Figure 2-Figure 4 As shown, the front rotating support assembly 5 includes a front bearing seat 11 arranged on the inner wall of the front end of the stator sleeve 3, and a plurality of front bearings 12 are arranged at the front end of the main shaft 4. The front bearings 12 abut against each other to form a front bearing group 13. The inner and outer rings of the front bearings 12 abut against the outer surface of the front end of the main shaft 4 and the inner surface of the front bearing seat 11 respectively. A front positioning structure 14 is arranged between the inner end of the front bearing group 13 and the main shaft 4 and the front bearing seat 11, and a front sealing structure 15 is arranged at the outer end of the front bearing group 13.

[0035] The front bearing 12 sleeved on the front end of the main shaft 4 supports the weight of the main shaft 4 and bears the load from the main shaft 4, which can reduce the vibration and deformation of the main shaft 4 during high-speed rotation and processing, ensure the stable operation of the main shaft 4, and effectively reduce the friction force on the main shaft 4 when it rotates. The front positioning structure 14 and the front sealing structure 15 cooperate to position and fix the front bearing group 13 to prevent the front bearing 12 from shifting and falling off, and the front sealing structure 15 plays a sealing role to prevent external pollution from entering and internal lubricant from leaking.

[0036] Specifically, combined with Figure 2 and Figure 3 As shown, the front positioning structure 14 includes a first positioning boss 16 arranged on the inner end of the front bearing seat 11, a second positioning boss 17 is provided on the front end of the main shaft 4, and the inner ends of the inner and outer rings of the front bearing 12 located at the innermost end of the main shaft 4 are respectively abutted against the second positioning boss 17 and the first positioning boss 16.

[0037] The inner ends of the inner and outer rings of the innermost front bearing 12 respectively abut against the second positioning boss 17 and the first positioning boss 16, thereby achieving the limited fixation of the inner end of the front bearing assembly 13, and the front bearing 12 is firmly and reliably fixed.

[0038] Specifically, combined with Figure 2 and Figure 3 As shown, the front sealing structure 15 includes a front sealing flange 18 sleeved on the front end of the main shaft 4, the front sealing flange 18 is fixedly connected to the outer end of the front bearing seat 11, the inner end of the front sealing flange 18 is provided with a third positioning boss 19 and a front positioning groove 20, and the front positioning groove 20 is provided with a front seal 21, and the outer ends of the inner and outer rings of the front bearing 12 located at the outermost end of the main shaft 4 are respectively abutted against the front seal 21 and the third positioning boss 19.

[0039] A front sealing ring 22 is provided between the front sealing flange 18 and the front flange cover 7 .

[0040] The outer ends of the inner and outer rings of the outermost front bearing 12 are respectively abutted against the front seal 21 and the third positioning boss 19, and the limit fixation at the inner end of the front bearing group can achieve stable fixation of the front bearing group 13. The front bearing 12 is firmly and reliably fixed without loosening or displacement, thereby ensuring the stable operation of the main shaft 4. The front sealing flange 18 plays a sealing role with strong sealing performance. The front sealing ring 22 between the front sealing flange 18 and the front flange cover 7 and the front seal 21 in the front positioning groove 20 play a role in enhancing the sealing performance.

[0041] Specifically, combined with Figure 2-Figure 4 As shown, the rear rotating support assembly 6 includes a rear bearing seat 23 arranged on the inner wall of the rear end of the stator sleeve 3, and a plurality of rear bearings 24 are arranged at the rear end of the main shaft 4. The rear bearings 24 abut against each other to form a rear bearing group 28. The inner and outer rings of the rear bearings 24 abut against the outer surface of the rear end of the main shaft 4 and the inner surface of the rear bearing seat 23 respectively. The inner end of the rear bearing group 28 is unilaterally positioned by the positioning shoulder 25 on the main shaft 4, and the outer end of the rear bearing group 28 is provided with a rear sealing structure 26.

[0042] The rear bearing 24 sleeved on the rear end of the main shaft 4 supports the weight of the main shaft 4 and bears the load from the main shaft 4. It can reduce the vibration and deformation of the main shaft 4 during high-speed rotation and processing, ensure the stable operation of the main shaft 4, and effectively reduce the friction force on the main shaft 4 when it rotates. The rear sealing structure 26 cooperates with the positioning shoulder 25 on the main shaft 4 to position and fix the rear bearing group 28 to prevent the rear bearing 24 from shifting and falling off. The rear sealing structure 26 plays a sealing role to prevent external pollution from entering and internal lubricant from leaking.

[0043] Specifically, combined with Figure 2-Figure 4 As shown, the rear sealing structure 26 includes a rear sealing labyrinth flange 27 sleeved on the rear end of the main shaft 4, the rear sealing labyrinth flange 27 is fixedly connected to the outer end of the rear bearing seat 23, and the outer end of the rear bearing group 28 abuts against the inner end of the rear sealing labyrinth flange 27.

[0044] The outer end of the rear bearing group 28 abuts against the inner end of the rear sealing labyrinth flange 27, and the inner end of the rear bearing group abuts against the positioning shoulder 25 on the main shaft 4, thereby achieving a stable fixation of the rear bearing group 28. The rear bearing 24 is firmly and reliably fixed without loosening or displacement, thereby ensuring the stable operation of the main shaft 4. The rear sealing labyrinth flange 27 has the advantages of high sealing performance and zero leakage, and can maintain a stable sealing effect.

[0045] A rear sealing ring 29 is provided between the rear sealing labyrinth flange 27 and the rear flange cover 8, and the rear sealing ring 29 plays a role in strengthening the sealing.

[0046] Specifically, combined with Figure 1-Figure 4As shown, the front grinding wheel assembly 9 includes a front grinding wheel flange 30 arranged on the front end of the main shaft 4, and the front grinding wheel flange 30 includes a front shaft body 31 and a front disk body 32 coaxial with the main shaft 4. A front fixing piece 36 is provided at the outer end of the front shaft body 31, and the inner surface of the front shaft body 31 and the outer surface of the main shaft 4 are tightly fitted through a conical surface. A front positioning cover 33 is provided at the outer end of the front shaft body 31, and a front grinding wheel 34 is provided between the front positioning cover 33 and the front disk body 32. A front grinding wheel cover 35 is provided outside the front grinding wheel 34, and the front grinding wheel cover 35 is connected to the outer end of the front flange cover 7.

[0047] The front positioning cover 33 cooperates with the front disc body 32 to fix the front grinding wheel 34. The inner surface of the front shaft body 31 and the outer surface of the main shaft 4 are tightly fitted through the conical surface to achieve high-precision positioning and firm fixation to ensure that the front grinding wheel 34 will not have position deviation during rotation. The front fixing piece 36 at the outer end of the front shaft body 31 plays a fixing role, and the front grinding wheel cover 35 plays a protective role.

[0048] Specifically, combined with Figure 2-Figure 4 As shown, the rear grinding wheel assembly 10 includes a rear grinding wheel flange 37 arranged on the rearmost end of the main shaft 4, and the rear grinding wheel flange 37 includes a rear shaft body 38 and a rear disc body 39 coaxial with the main shaft 4. A rear fixing piece 43 is provided at the outer end of the rear shaft body 38, and the inner surface of the rear shaft body 38 and the outer surface of the main shaft 4 are tightly fitted through a conical surface. A rear positioning cover 40 is provided at the outer end of the rear shaft body 38, and a rear grinding wheel 41 is provided between the rear positioning cover 40 and the rear disc body 39. A rear grinding wheel cover 42 is provided outside the rear grinding wheel 41, and the rear grinding wheel cover 42 is connected to the outer end of the rear flange cover 8.

[0049] The rear positioning cover 40 cooperates with the rear disc body 39 to fix the rear grinding wheel 41. The inner surface of the rear shaft body 38 and the outer surface of the main shaft 4 are tightly fitted through the conical surface to achieve high-precision positioning and stable fixation to ensure that the rear grinding wheel 41 will not have position deviation during rotation. The rear fixing piece 43 at the outer end of the rear shaft body 38 plays a fixing role, and the rear grinding wheel cover 42 plays a protective role.

[0050] Specifically, combined with Figure 2 and Figure 3 As shown, a first front positioning step 44 and a second front positioning step 45 are respectively provided on the inner end of the front positioning cover 33 and the outer end of the front disk body 32, and the inner and outer ends of the inner ring of the front grinding wheel 34 respectively abut against the second front positioning step 45 and the first front positioning step 44; a first rear positioning step 46 and a second rear positioning step 47 are respectively provided on the inner end of the rear positioning cover 40 and the outer end of the rear disk body 39, and the inner and outer ends of the inner ring of the rear grinding wheel 41 respectively abut against the second rear positioning step 47 and the first rear positioning step 46.

[0051] The second front positioning step 45 and the first front positioning step 44 respectively position and fix the inner and outer ends of the inner ring of the front grinding wheel 34 to ensure stable fixation. The second rear positioning step 47 and the first rear positioning step 46 respectively position and fix the inner and outer ends of the inner ring of the rear grinding wheel 41 to ensure stable fixation.

[0052] Specifically, combined with Figure 1 and Figure 2 As shown, a high-precision turntable 48 capable of driving the box body 1 to rotate horizontally is provided at the bottom end of the box body 1.

[0053] The high-precision turntable 48 at the bottom of the box body 1 can drive the box body 1 to rotate horizontally, and can be rotated and adjusted to position at any horizontal angle to facilitate processing.

[0054] The working principle of the utility model is: start the external frequency converter to drive the spindle 4 to rotate through the electromagnetic action of the permanent magnet stator in the stator sleeve 3 and the permanent magnet rotor on the spindle 4, thereby driving the front grinding wheel 34 and the rear grinding wheel 41 at both ends of the spindle 4 to operate, and multiple workpieces can be ground at the same time; the high-precision turntable 48 at the bottom of the box body 1 can drive the box body 1 to rotate horizontally, and can be rotated and adjusted at any angle horizontally for easy processing;

[0055] The inner ends of the inner and outer rings of the innermost front bearing 12 respectively abut against the second positioning boss 17 and the first positioning boss 16, thereby realizing the limit fixation of the inner end of the front bearing group 13. The outer ends of the inner and outer rings of the outermost front bearing 12 respectively abut against the front seal 21 and the third positioning boss 19, thereby realizing the stable fixation of the front bearing group 13 and the front bearing 12 by cooperating with the limit fixation of the inner end of the front bearing group.

[0056] The outer end of the rear bearing assembly 28 abuts against the inner end of the rear sealing labyrinth flange 27, and the inner end of the rear bearing assembly abuts against the positioning shoulder 25 on the main shaft 4, thereby achieving a stable fixation of the rear bearing assembly 28;

[0057] The front positioning cover 33 cooperates with the front disc body 32 to fix the front grinding wheel 34. The inner surface of the front shaft body 31 and the outer surface of the main shaft 4 are tightly fitted through the conical surface, so as to achieve high-precision positioning and firm fixation to ensure that the front grinding wheel 34 will not have position deviation during rotation. The front fixing piece 36 at the outer end of the front shaft body 31 plays a fixing role; the rear positioning cover 40 and the rear disc body 39 cooperate to fix the rear grinding wheel 41. The inner surface of the rear shaft body 38 and the outer surface of the main shaft 4 are tightly fitted through the conical surface, so as to achieve high-precision positioning and firm fixation. The rear fixing piece 43 at the outer end of the rear shaft body 38 plays a fixing role.

[0058] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0059] Although this article uses more housing 1, spindle frame 2, stator sleeve 3, spindle 4, front rotating support assembly 5, rear rotating support assembly 6, front flange cover 7, rear flange cover 8, front grinding wheel assembly 9, rear grinding wheel assembly 10, front bearing seat 11, front bearing 12, front bearing group 13, front positioning structure 14, front sealing structure 15, first positioning boss 16, second positioning boss 17, front sealing flange 18, third positioning boss 19, front positioning groove 20, front seal 21, front sealing ring 22, rear bearing seat 23, rear bearing 24, positioning Shoulder 25, rear sealing structure 26, rear sealing labyrinth flange 27, rear bearing assembly 28, rear sealing ring 29, front grinding wheel flange 30, front shaft body 31, front disc body 32, front positioning cover 33, front grinding wheel 34, front grinding wheel cover 35, front fixing member 36, rear grinding wheel flange 37, rear shaft body 38, rear disc body 39, rear positioning cover 40, rear grinding wheel 41, rear grinding wheel cover 42, rear fixing member 43, first front positioning step 44, second front positioning step 45, first rear positioning step 46, second rear positioning step 47, high-precision rotary table 48, etc., these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A dual-grinding wheel electric spindle mechanism, comprising a box (1), wherein a spindle frame (2) is provided on one side of the box (1), characterized in that: A stator sleeve (3) is coaxially arranged at the middle end of the spindle frame (2), a spindle (4) is coaxially rotatably connected inside the stator sleeve (3), a permanent magnet stator is arranged on the inner wall of the stator sleeve (3), a permanent magnet rotor matching the permanent magnet stator is sleeved on the middle part of the spindle (4), a front rotating support assembly (5) and a rear rotating support assembly (6) are respectively arranged between the front and rear ends of the stator sleeve (3) and the spindle (4), a front flange cover (7) and a rear flange cover (8) are respectively arranged between the front and rear ends of the spindle frame (2) and the spindle (4), and a front grinding wheel assembly (9) and a rear grinding wheel assembly (10) are respectively arranged on the two ends of the spindle (4) extending out of the spindle frame (2).

2. The dual-grinding wheel electric spindle mechanism according to claim 1, characterized in that: The front rotating support assembly (5) comprises a front bearing seat (11) arranged on the inner wall of the front end of the stator sleeve (3); a plurality of front bearings (12) are arranged at the front end of the main shaft (4); the front bearings (12) abut against each other to form a front bearing group (13); the inner and outer rings of the front bearings (12) abut against the outer surface of the front end of the main shaft (4) and the inner surface of the front bearing seat (11), respectively; a front positioning structure (14) is arranged between the inner end of the front bearing group (13) and the main shaft (4) and the front bearing seat (11); and a front sealing structure (15) is arranged at the outer end of the front bearing group (13).

3. The double-grinding-wheel electric spindle mechanism according to claim 2, characterized in that: The front positioning structure (14) includes a first positioning boss (16) arranged on the inner end of the front bearing seat (11), and a second positioning boss (17) is arranged on the front end of the main shaft (4). The inner ends of the inner and outer rings of the front bearing (12) located at the innermost end of the main shaft (4) are respectively abutted against the second positioning boss (17) and the first positioning boss (16).

4. The dual-grinding wheel electric spindle mechanism according to claim 2, characterized in that: The front sealing structure (15) comprises a front sealing flange (18) sleeved on the front end of the main shaft (4), the front sealing flange (18) being fixedly connected to the outer end of the front bearing seat (11), the inner end of the front sealing flange (18) being provided with a third positioning boss (19) and a front positioning groove (20), the front positioning groove (20) being provided with a front sealing member (21), and the outer ends of the inner and outer rings of the front bearing (12) located at the outermost end of the main shaft (4) being respectively abutted against the front sealing member (21) and the third positioning boss (19).

5. The dual-grinding wheel electric spindle mechanism according to claim 1, characterized in that: The rear rotating support assembly (6) comprises a rear bearing seat (23) arranged on the inner wall of the rear end of the stator sleeve (3); a plurality of rear bearings (24) are arranged at the rear end of the main shaft (4); the rear bearings (24) abut against each other to form a rear bearing group (28); the inner and outer rings of the rear bearings (24) abut against the outer surface of the rear end of the main shaft (4) and the inner surface of the rear bearing seat (23) respectively; the inner end of the rear bearing group (28) is unilaterally positioned by a positioning shoulder (25) on the main shaft (4); and the outer end of the rear bearing group (28) is provided with a rear sealing structure (26).

6. The dual-grinding wheel electric spindle mechanism according to claim 5, characterized in that: The rear sealing structure (26) comprises a rear sealing labyrinth flange (27) sleeved on the rear end of the main shaft (4); the rear sealing labyrinth flange (27) is fixedly connected to the outer end of the rear bearing seat (23); the outer end of the rear bearing assembly (28) abuts against the inner end of the rear sealing labyrinth flange (27).

7. The dual-grinding wheel electric spindle mechanism according to claim 1, characterized in that: The front grinding wheel assembly (9) comprises a front grinding wheel flange (30) arranged at the front end of the main shaft (4), the front grinding wheel flange (30) comprises a front shaft body (31) and a front disk body (32) coaxial with the main shaft (4), a front fixing piece (36) is arranged at the outer end of the front shaft body (31), the inner surface of the front shaft body (31) and the outer surface of the main shaft (4) are tightly fitted through a conical surface, a front positioning cover (33) is arranged at the outer end of the front shaft body (31), a front grinding wheel (34) is arranged between the front positioning cover (33) and the front disk body (32), a front grinding wheel cover (35) is arranged outside the front grinding wheel (34), and the front grinding wheel cover (35) is connected to the outer end of the front flange cover (7).

8. The dual-grinding wheel electric spindle mechanism according to claim 7, characterized in that: The rear grinding wheel assembly (10) comprises a rear grinding wheel flange (37) arranged on the rearmost end of the main shaft (4), the rear grinding wheel flange (37) comprises a rear shaft body (38) and a rear disc body (39) coaxial with the main shaft (4), a rear fixing piece (43) is arranged at the outer end of the rear shaft body (38), the inner surface of the rear shaft body (38) and the outer surface of the main shaft (4) are tightly fitted through a conical surface, a rear positioning cover (40) is arranged at the outer end of the rear shaft body (38), a rear grinding wheel (41) is arranged between the rear positioning cover (40) and the rear disc body (39), a rear grinding wheel cover (42) is arranged outside the rear grinding wheel (41), and the rear grinding wheel cover (42) is connected to the outer end of the rear flange cover (8).

9. The dual-grinding wheel electric spindle mechanism according to claim 8, characterized in that: A first front positioning step (44) and a second front positioning step (45) are respectively provided on the inner end of the front positioning cover (33) and the outer end of the front disc body (32), and the inner and outer ends of the inner ring of the front grinding wheel (34) respectively abut against the second front positioning step (45) and the first front positioning step (44); a first rear positioning step (46) and a second rear positioning step (47) are respectively provided on the inner end of the rear positioning cover (40) and the outer end of the rear disc body (39), and the inner and outer ends of the inner ring of the rear grinding wheel (41) respectively abut against the second rear positioning step (47) and the first rear positioning step (46).

10. The double-grinding-wheel electric spindle mechanism according to any one of claims 1 to 9, characterized in that: The bottom end of the box body (1) is provided with a high-precision turntable (48) capable of driving the box body (1) to rotate horizontally.

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