High-precision thread grinder workpiece electric spindle
By adopting a combination structure of double-row cylindrical roller bearings and double-direction thrust ball bearings in the electric spindle for thread grinding, the problems of insufficient rigidity and resonance of the electric spindle are solved, achieving high rigidity and long-term stable operation.
Patent Information
- Application Number
- CN202423220010.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The existing electric spindles for thread grinding have low rigidity, making it difficult to perform grinding operations with large feed rates. Furthermore, the lack of a positioning mechanism in the bearings makes them prone to resonance, leading to abnormal conditions.
It adopts a combination structure of double-row cylindrical roller bearings and double-direction thrust ball bearings, combined with front and rear bearing devices, adds a positioning mechanism, and improves rigidity and stability through sealing design and cooling system.
It improves the rigidity and stability of the electric spindle, avoids resonance, extends service life, and enables efficient long-term operation.
Smart Images
Figure CN223603605U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a main shaft especially to a high-precision thread grinding workpiece electric spindle. BACKGROUND
[0002] High-precision threads need to be ground to reach the precision level, as the key functional components of thread grinding machines, the performance of thread grinding workpiece electric spindles determines the quality and efficiency of thread grinding, therefore, high rigidity and high precision are required for thread grinding workpiece electric spindles.
[0003] However, the existing electric spindles are mainly driven by belts, and have low overall rigidity, and cannot perform grinding processing with large feed rates.
[0004] Currently, there are also multi-bearing cooperation structures. However, the bearings lack proper positioning mechanisms, and are prone to resonance. In turn, abnormal states such as "shaft beating" may occur, which is not conducive to long-term stable operation.
[0005] In view of the above-mentioned defects, the present design person actively researches and innovates to create a high-precision thread grinding workpiece electric spindle, which has more industrial utilization value. INVENTION CONTENTS
[0006] To solve the above technical problems, the purpose of the utility model is to provide a high-precision thread grinding workpiece electric spindle.
[0007] The high-precision thread grinding workpiece electric spindle of the utility model comprises a main shaft base, a rotating shaft assembly is installed in the main shaft base, wherein: a front end bearing device is installed on the front side of the rotating shaft assembly, a rear end bearing device is installed on the rear side of the rotating shaft assembly, a dust cover is installed on the front end bearing device through a front end sealing device, a rear end cover is installed on the rear end bearing device, the rotating shaft assembly comprises a rotor shaft, a driving key is installed on the front end of the rotor shaft, a rotor inner bushing is sleeved on the rotor shaft, a motor stator is connected outside the rotor inner bushing, a front precision locking nut is sleeved on the rotor shaft, the front precision locking nut is in contact with the front end bearing device, a coding device is sleeved on the rear end bearing device, the coding device is connected with the rotor shaft, a rear precision locking nut is sleeved on the rear end of the rotor shaft, and the rear precision locking nut is in contact with the coding device.
[0008] Further, the high-precision thread grinding workpiece electric spindle, wherein the front end bearing device comprises a main bearing assembly sleeved on the rotor shaft and in contact with the front precision locking nut, the front end of the main bearing assembly is sleeved with a first ultra-precision main shaft bearing through a spacing assembly, the rear end of the main bearing assembly and the front precision locking nut are sleeved with a front adjusting spacer ring, the main bearing assembly and the first ultra-precision main shaft bearing are externally sleeved with a front bearing seat, and the front bearing seat is connected with a front end sealing device.
[0009] Further, the high-precision thread grinding workpiece electric spindle, wherein the main bearing assembly comprises a first precision angular contact ball bearing and a second precision angular contact ball bearing combined back to back with each other, and the spacing assembly comprises a bearing inner spacer ring and a bearing outer spacer ring in abutment with each other.
[0010] Further, the high-precision thread grinding workpiece electric spindle, wherein the front end sealing device comprises a front gland in contact with the first ultra-precision main shaft bearing, the front gland is mounted with an air-tight sealing ring, and the front gland and the air-tight sealing ring are distributed with precision skeleton oil seals.
[0011] Further, the high-precision thread grinding workpiece electric spindle, wherein the rear end bearing device comprises a rear adjusting spacer ring sleeved on the rear end of the rotor shaft, the rear adjusting spacer ring is sleeved with a second ultra-precision main shaft bearing, the second ultra-precision main shaft bearing is in contact with a coding device through a bearing gland, and the second ultra-precision main shaft bearing is externally sleeved with a rear bearing seat.
[0012] Further, the high-precision thread grinding workpiece electric spindle, wherein the coding device comprises an auxiliary spacer ring in contact with the rear end bearing device, the auxiliary spacer ring is sleeved with a coding wheel, the coding wheel is mounted with an encoder, the coding wheel is externally sleeved with a fixing seat, and the auxiliary spacer ring and the coding wheel are both in contact with the rear end of the rotor shaft.
[0013] Further, the high-precision thread grinding workpiece electric spindle, wherein the rear end cover is connected with the main shaft base through a cylinder head screw.
[0014] Further, the high-precision thread grinding workpiece electric spindle, wherein the rear end cover is mounted with a plug assembly, and the plug assembly comprises one or more of a power line socket, a signal line socket and a signal line socket.
[0015] By the above scheme, the high-precision thread grinding workpiece electric spindle has at least the following advantages:
[0016] 1. The front end bearing device and the rear end bearing device are matched with each other to form a double-row cylindrical roller bearing supporting mode, so that the rotor shaft assembly has better use rigidity and the stress bearing effect is improved.
[0017] 2. The whole adopts the bushing layout, which is convenient for assembly and maintenance, and does not need to drive with the belt.
[0018] 3. According to the actual needs, the sealing ring can be laid out, and the sealing effect is good, foreign matters are avoided to enter, and the service life is prolonged.
[0019] 4. The cooling liquid can be introduced to meet the needs of long-time operation.
[0020] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and the content of the specification can be implemented, the following preferred embodiments of the utility model are described in detail with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0021] Fig. 1 It is a rear end structure schematic diagram of the high-precision thread grinding workpiece electric spindle.
[0022] Fig. 2 It is a cross-sectional structure schematic diagram of the high-precision thread grinding workpiece electric spindle.
[0023] The meanings of the various reference signs in the drawings are as follows.
[0024] 1. Rotor shaft 2. Driving key
[0025] 3. Dust cover 4. Air seal ring
[0026] 5. Precision skeleton oil seal 6. Front gland
[0027] 7. Front bearing seat 8. Spindle base
[0028] 9. First ultra-precision spindle bearing 10. Bearing inner spacer ring
[0029] 11. Bearing outer spacer ring 12. First precision angular contact ball bearing
[0030] 13. Second precision angular contact ball bearing 14. Front adjustment spacer ring
[0031] 15. Front precision locking nut 16. Motor stator
[0032] 17. Rotor inner bushing 18. Rear adjustment spacer ring
[0033] 19. Second ultra-precision spindle bearing 20. Rear bearing seat
[0034] 21. Fixed seat 22. Rear end cover
[0035] 23. Bearing gland 24. Encoder
[0036] 25. Auxiliary spacer ring 26. Encoding wheel
[0037] 27 rear precision locking nut 28 cylinder head screw
[0038] 29 sealing ring 30 power line socket
[0039] 31 signal line socket 32 signal line socket DETAILED DESCRIPTION
[0040] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.
[0041] As Figs. 1-2 The high-precision threaded grinding workpiece electric spindle comprises a spindle base 8, and a rotating shaft assembly is installed in the spindle base 8, and the difference lies in that a front end bearing device is installed on the front side of the rotating shaft assembly, and a rear end bearing device is installed on the rear side of the rotating shaft assembly. In this way, the cooperation of double bearings can be realized, the stable operation of the rotating shaft assembly can be realized, and deviation will not occur. At the same time, a dust cover 3 is installed on the front end bearing device through a front end sealing device. In this way, the front end sealing can be met, liquid leakage will not occur when the cooling system is connected, and external foreign matter will not enter. In addition, a rear end cover 22 is installed on the rear end bearing device, so that the unified layout of various plug assemblies can be realized subsequently. In view of the stability of locking, the rear end cover 22 is connected with the spindle base 8 through a cylinder head screw 28.
[0042] During implementation, the rotating shaft assembly comprises a rotor shaft 1, a driving key 2 is installed at the front end of the rotor shaft 1, can be connected to the driving port of the corresponding to-be-driven equipment, and convenient connection can be realized. The rotor shaft 1 is sleeved with a rotor inner bushing 17, and the rotor inner bushing 17 is connected with a motor stator 16. At the same time, a front precision locking nut 15 is sleeved on the rotor shaft 1, and the front precision locking nut 15 is in contact with the front end bearing device. In this way, unnecessary longitudinal displacement of the front end bearing device during operation can be effectively avoided. In addition, a coding device is sleeved on the rear end bearing device, and the coding device is connected with the rotor shaft 1. In this way, different codes can be completed according to actual needs, so that the rotating shaft assembly can provide different output conditions. Furthermore, a rear precision locking nut 27 is sleeved on the rear end of the rotor shaft 1, and the rear precision locking nut 27 is in contact with the coding device.
[0043] In combination with the preferred embodiment of the utility model, the front end bearing device comprises a main bearing assembly sleeved on the rotor shaft 1 and in contact with the front precision locking nut 15, the front end of the main bearing assembly is sleeved with the first super-precision main shaft bearing 9 through a spacing assembly. Meanwhile, the front end of the main bearing assembly and the rear end between the front precision locking nut 15 are sleeved with the front adjusting spacer ring 14, so that improper loosening is avoided. Furthermore, the main bearing assembly and the first super-precision main shaft bearing 9 are sleeved with the front bearing seat 7, and the front end sealing device is connected to the front bearing seat 7. During implementation, a cooling groove can be formed on the outer circle of the front bearing seat 7, so that the front end bearing cooling system is formed with the main shaft base 8, and cooling liquid can be introduced to cool the front end bearing device. Furthermore, the main bearing assembly comprises the first precision angular contact ball bearing 12 and the second precision angular contact ball bearing 13 combined back to back, and the spacing assembly comprises the bearing inner spacer ring 10 and the bearing outer spacer ring 11 in abutment with each other. In this way, better anti-vibration running stability is achieved.
[0044] Further, the front end sealing device comprises the front gland 6 in contact with the first super-precision main shaft bearing 9, the air-tight sealing ring 4 is installed on the front gland 6, and the precision skeleton oil seal 5 is distributed between the front gland 6 and the air-tight sealing ring 4. In this way, sealing reinforcement can be achieved without affecting running lubrication.
[0045] In combination with the actual implementation, the rear end bearing device comprises the rear adjusting spacer ring 18 sleeved on the rear end of the rotor shaft 1, and the second super-precision main shaft bearing 19 is sleeved on the rear adjusting spacer ring 18. Meanwhile, the second super-precision main shaft bearing 19 is in contact with the encoding device through the bearing gland 23, and the second super-precision main shaft bearing 19 is sleeved with the rear bearing seat 20. In this way, the second super-precision main shaft bearing 19 can be properly limited by relying on the rear bearing seat 20, so that even if abnormal vibration of the rotating shaft assembly occurs, vibration stress transmission can be realized through positioning of the rear bearing seat 20, the vibration stress is avoided from being concentrated on the rotating shaft assembly, and improper deformation of the rotating shaft assembly is avoided.
[0046] Further, the encoding device adopted by the utility model comprises the auxiliary spacer ring in contact with the rear end bearing device, the encoding wheel 26 is sleeved on the auxiliary spacer ring, the encoder 2524 is installed on the encoding wheel 26, the fixing seat 21 is sleeved on the encoding wheel 26, and the auxiliary spacer ring and the encoding wheel 26 are in contact with the rear end of the rotor shaft 1. In this way, the encoder 2524 can be used to control the encoding wheel 26, and the encoding wheel 26 is prevented from loosening through the existence of the fixing seat 21, so that the accuracy of use of the encoding wheel 26 is maintained.
[0047] Furthermore, considering the convenience of the connection of various control wires, the rear end cover 22 is provided with a plug assembly, which comprises one or more of the power line socket 30, the signal line socket 3231 and the signal line socket 3231.
[0048] The working principle of the utility model is as follows:
[0049] The whole adopts the combined mode of double-row end cylindrical roller bearings and bidirectional thrust ball bearings, the rigidity of the rotating shaft assembly is high, the double-row short cylindrical roller bearings can bear larger radial force, and the bidirectional thrust ball bearings can bear larger axial force due to the larger contact angle than the precise angular contact ball bearings.
[0050] Meanwhile, the rear end bearing device also adopts the double-row short cylindrical roller bearings as the main bearing to bear the radial force, can bear the overturning moment brought by the front end of the main shaft, and appropriately increases the pre-tightening force of the bearing according to the rotating speed of the main shaft, so that the rigidity is ensured and the rotating speed requirement of the rotating shaft assembly is met.
[0051] As can be seen from the above description and the drawings, the utility model has the following advantages:
[0052] 1. The front end bearing device and the rear end bearing device are matched with each other to form a double-row cylindrical roller bearing supporting mode, so that the rotating shaft assembly has better use rigidity and the stress bearing effect is improved.
[0053] 2. The whole adopts the bushing layout mode, so that assembly and maintenance are facilitated, and a belt is not needed to participate in driving.
[0054] 3. The sealing ring can be arranged according to actual needs, so that the sealing effect is good, foreign matters are prevented from entering, and the service life is prolonged.
[0055] 4. Cooling liquid can be introduced to meet the need of long-time operation.
[0056] Moreover, the front end sealing of the workpiece electric spindle is also precisely designed according to the working environment of the thread grinding machine tool, in addition to the air seal, a plurality of mechanical seals are designed, so that the practical service life of the spindle is effectively improved.
[0057] In addition, the indication direction or position relationship described in the utility model is based on the direction or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or structure must have a specific direction or be operated in a specific direction, so it cannot be understood as a limitation on the utility model.
[0058] The above merely is preferred implementation manner of the present application, and is not used for limiting the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the technical principle of the present application, can also make several improvements and variations, these improvements and variations also should be regarded as the protection scope of the present application.
Claims
1. A high-precision threaded grinding workpiece electric spindle, comprising a spindle base, a rotating shaft assembly is installed in the spindle base, characterized in that: The front end bearing device is provided with a dust cover through a front end sealing device, and the rear end bearing device is provided with a rear end cover.
2. The high-precision thread grinding workpiece electric spindle according to claim 1, characterized in that: The front end bearing device comprises a main bearing assembly sleeved on the rotor shaft and in contact with the front precision locking nut, the front end of the main bearing assembly is sleeved with a first super-precision main shaft bearing through a spacing assembly, and the rear end of the main bearing assembly and the front precision locking nut are sleeved with a front adjusting spacer ring.
3. The high-precision thread grinding workpiece electric spindle according to claim 2, characterized in that: The main bearing assembly comprises a first precision angular contact ball bearing and a second precision angular contact ball bearing combined back to back with each other, and the spacing assembly comprises a bearing inner spacer ring and a bearing outer spacer ring in abutment with each other.
4. The high-precision thread grinding workpiece electric spindle according to claim 1, characterized in that: The front end sealing device comprises a front gland in contact with the first super-precision main shaft bearing, the front gland is provided with an air-tight sealing ring, and the front gland and the air-tight sealing ring are distributed with a precision skeleton oil seal.
5. The high-precision thread grinding workpiece electric spindle according to claim 1, characterized in that: The rear end bearing device comprises a rear adjusting spacer ring sleeved on the rear end of the rotor shaft, the rear adjusting spacer ring is sleeved with a second super-precision main shaft bearing, the second super-precision main shaft bearing is in contact with the encoding device through a bearing gland, and the second super-precision main shaft bearing is sleeved with a rear bearing seat.
6. The high-precision thread grinding workpiece electric spindle according to claim 1, characterized in that: The encoding device comprises an auxiliary spacer ring in contact with the rear end bearing device, the auxiliary spacer ring is sleeved with an encoding wheel, the encoding wheel is provided with an encoder, the encoding wheel is sleeved with a fixing seat, and the auxiliary spacer ring and the encoding wheel are in contact with the rear end of the rotor shaft.
7. The high-precision thread grinding workpiece electric spindle according to claim 1, characterized in that: The rear end cover is connected with the main shaft base through a cylinder head screw.
8. The high-precision thread grinding workpiece electric spindle according to claim 1, characterized in that: The rear end cover is provided with a plug assembly, and the plug assembly comprises one or more of a power line socket, a signal line socket and a signal line socket.