CN111069633A - Main shaft cutter unloading limiting structure - Google Patents
Main shaft cutter unloading limiting structure Download PDFInfo
- Publication number
- CN111069633A CN111069633A CN201911226339.2A CN201911226339A CN111069633A CN 111069633 A CN111069633 A CN 111069633A CN 201911226339 A CN201911226339 A CN 201911226339A CN 111069633 A CN111069633 A CN 111069633A
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- China
- Prior art keywords
- main shaft
- positioning
- limiting sleeve
- lower bearing
- cutter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention discloses a main shaft cutter-unloading limiting structure which comprises a main shaft, a machine body and a limiting sleeve, wherein the main shaft can rotate relative to the machine body; the lower bearing seat is provided with an annular positioning surface for axially positioning the lower bearing, and the annular positioning surface is concavely provided with a positioning groove; the limiting sleeve is provided with a mounting part and a positioning part which are connected; the limiting sleeve is connected with the lower bearing seat through the mounting part, and the positioning part is abutted against the bottom of the positioning groove to limit the mounting position of the limiting sleeve; the main shaft is provided with a shaft shoulder, the limiting sleeve is provided with a supporting surface, and the main shaft penetrates through the limiting sleeve and is matched with the shaft shoulder through the supporting surface to limit the moving distance of the main shaft in the cutter unloading process. It has the following advantages: the impact of the cutter unloading force borne by the bearing is avoided, the product precision is improved, and the processing cost is reduced.
Description
Technical Field
The invention relates to the technical field of main shaft devices of machining equipment, in particular to a main shaft cutter unloading limiting structure.
Background
A spindle device with an automatic tool changing function usually requires a limitation of the spindle displacement. Because the spindle axis is provided with a highly compressed disc spring, taking an ISO25 tool holder as an example, when the spindle is dismounted, the axis needs to bear at least 1000N impact force, the impact force can cause the axis to displace forwards, and when the displacement is too large, the lower bearing is damaged. Aiming at the problems, the displacement of the axis of the main shaft in the industry is provided with the following two limit structures.
In the first limiting structure, the upper bearing seat is used for limiting, referring to fig. 1, since the angular contact ball bearing 11 'at the upper end of the main shaft 1' has an upward opening and can bear a certain axial force, the main shaft 1 'can be limited by limiting the upper bearing seat 12'. When the main shaft 1 ' unloads a cutter, the pull rod 2 ' runs downwards, the disc spring 21 ' is compressed, impact force is transmitted to the shaft center 1 ', the shaft center 1 ' drives the bearing 11 ' and the upper bearing seat 12 ' to slide downwards, when the upper bearing seat 12 ' slides downwards until the limiting jackscrew 13 ' contacts the limiting seat 14 ', the upper bearing seat 12 ' is limited, the sliding is stopped, the upper bearing 11 ' absorbs the impact force of the shaft center 1 ', the shaft center 1 ' is prevented from continuously moving downwards, and the limiting of the shaft center 1 ' is realized. A pre-tightening spring 121 ' is arranged between the upper bearing 12 ' and the limiting seat 14 '.
Among this first kind of limit structure, utilize the upper bearing to absorb axle center impact force, this life-span to the upper bearing has the damage, especially lies in the operating mode of frequent tool changing, can make the upper bearing frequently receive the impact, and the upper bearing life-span shortens, takes place unusual probability increase. In addition, the assembly of jackscrew relies on workman's experience, if when unloading the sword, only individual jackscrew and spacing seat take place the contact in the circumferencial direction, will lead to bearing frame atress, has the harmful effects to the bearing.
Referring to fig. 2, in the second limiting structure, a lower bearing section of the shaft center 1 'is provided with a shaft shoulder 15', a limiting gasket 17 'is arranged above the lower bearing seat 16', the limiting gasket 17 'has a matching surface opposite to the shaft shoulder 15', and the whole lower bearing seat 16 'is independently arranged as an assembly, so that the limiting gasket 17' can be conveniently subjected to size tolerance matching grinding. When the spindle 1 'is dismounted, the axis 1' sinks under the reaction force of the disc spring 21 ', so that the matching surfaces of the shaft shoulder 15' and the limiting gasket 17 'are mutually attached, and the displacement of the axis 1' is limited through the attachment.
In the second limiting structure, the lower bearing seat 16 'is provided with a lower bearing seat step 161', a limiting gasket 17 'is supported above the lower bearing seat step 161', a lower bearing 18 'is attached below the lower bearing seat step 161', the precision of two directions of the lower bearing seat step 161 'is difficult to clamp and form on a grinding machine at one time, and the lower bearing seat step has to be subjected to turning processing, so that an uncertain factor is brought to a whole size chain belt of a part, and the limiting stroke of the axis 1' is very short and is usually only 0.1mm, so that the influence of size tolerance on the assembly of the whole machine is avoided, after the limiting gasket 17 'is installed on the lower bearing seat 16', the matching surface of the limiting gasket 17 'needs to be independently ground, so that the lower bearing seat 16' needs to be independently divided into one part, the design. Meanwhile, each machine independently depends on grinding to cause the interchangeability of parts, so that the subsequent maintenance difficulty is improved.
In conclusion, the two existing schemes on the market are insufficient, the first scheme cannot completely avoid the impact absorption of the bearing, and the second limiting scheme avoids the impact of the bearing but needs to pay higher cost structurally.
Disclosure of Invention
The invention provides a main shaft cutter-unloading limiting structure, which overcomes the defects of the main shaft cutter-unloading limiting structure in the background technology.
One of the technical schemes adopted by the invention for solving the technical problems is as follows:
the main shaft cutter-unloading limiting structure comprises a main shaft, a machine body and a limiting sleeve, wherein the main shaft can rotate relative to the machine body; the lower bearing seat is provided with an annular positioning surface for axially positioning the lower bearing, and the annular positioning surface is concavely provided with a positioning groove; the limiting sleeve is provided with a mounting part and a positioning part which are connected; the limiting sleeve is connected with the lower bearing seat through the mounting part, and the positioning part is abutted against the bottom of the positioning groove to limit the mounting position of the limiting sleeve; the main shaft is provided with a shaft shoulder, the limiting sleeve is provided with a supporting surface, and the main shaft penetrates through the limiting sleeve and is matched with the shaft shoulder through the supporting surface to limit the moving distance of the main shaft in the cutter unloading process.
In one embodiment: this stop collar and step threaded connection, this installation department are equipped with the external screw thread, and this step is equipped with the internal thread correspondingly, and this external screw thread and internal thread all are cylindrical thread, and the axis coincidence of this external screw thread and internal thread and main shaft.
In one embodiment: the positioning part is closer to the annular positioning surface than the mounting part, the mounting part and the positioning part are both annular, the diameter of the outer peripheral surface of the positioning part is larger than that of the outer peripheral surface of the mounting part, and the positioning part is arranged in the positioning groove.
In one embodiment: the installation part is closer to the annular positioning surface than the positioning part, the installation part and the positioning part are both annular, the diameter of the outer peripheral surface of the installation part is larger than that of the outer peripheral surface of the positioning part, the internal thread is positioned on the side wall of the positioning groove, and the installation part and the positioning part are both arranged in the positioning groove.
In one embodiment: the positioning groove includes a circular groove coaxial with the main shaft.
In one embodiment: the annular positioning surface is close to the cutter mounting position, and the supporting surface is an end surface, perpendicular to the main shaft, of one end, far away from the cutter mounting position, of the limiting sleeve.
In one embodiment: the annular positioning surface is arranged downwards, and the supporting surface is the upward end surface of the limiting sleeve.
In one embodiment: the limit sleeve is provided with a through hole, the main shaft passes through the through hole of the limit sleeve, and a gap is reserved between the limit sleeve and the main shaft; a gap is reserved between the shaft shoulder and the supporting surface and used for preventing the limiting sleeve from contacting with the main shaft under normal working conditions.
In one embodiment: the end surface of the limiting sleeve close to the lower bearing or the side wall of the through hole is concavely provided with a tool groove for installing the limiting sleeve.
In one embodiment: the limiting sleeve is provided with a plurality of tool grooves for installing the limiting sleeve on the end face close to the lower bearing, the tool grooves are distributed in an annular mode coaxially with the main shaft, the tool grooves extend along the axial direction of the main shaft and are communicated with the through hole, and the depth of each tool groove is smaller than half of the axial length of the limiting sleeve on the main shaft.
In one embodiment: the limiting sleeve is made of wear-resistant and self-lubricating materials.
In one embodiment: the positioning groove is arranged on the annular positioning surface and close to the main shaft.
The second technical scheme adopted by the invention for solving the technical problems is as follows:
the main shaft unloads sword limit structure, its characterized in that: the main shaft can rotate relative to the machine body, the machine body is provided with a lower bearing seat, and a lower bearing is arranged between the lower bearing seat and the main shaft; the limiting sleeve is provided with a mounting part and a positioning part which are connected; the lower bearing seat is provided with an annular positioning surface for axially positioning the lower bearing and a second positioning surface for axially positioning the limiting sleeve, and the annular positioning surface and the second positioning surface are both arranged downwards; the limiting sleeve is connected with the lower bearing seat through the mounting part, and the mounting position of the limiting sleeve is limited by the positioning part abutting against the second positioning surface; the main shaft is provided with a shaft shoulder, the limiting sleeve is provided with a supporting surface, and the main shaft penetrates through the limiting sleeve and is matched with the shaft shoulder through the supporting surface to limit the moving distance of the main shaft in the cutter unloading process.
Compared with the background technology, the technical scheme has the following advantages:
the lower bearing seat is provided with an annular positioning surface for axially positioning the lower bearing, the annular positioning surface is concavely provided with a positioning groove, the limiting sleeve is abutted against the bottom of the positioning groove through a positioning part to limit the mounting position of the limiting sleeve, the main shaft is matched with the shaft shoulder of the main shaft through a supporting surface of the limiting sleeve to limit the moving distance of the main shaft in the tool unloading process, and the main shaft is prevented from further sliding downwards in the tool unloading process, so that the bearing is prevented from bearing the impact of tool unloading force, the technical defects existing in the background technology are overcome, the mounting position of the limiting sleeve is limited by the positioning groove concavely arranged on the annular positioning surface, the annular positioning surface and the positioning groove can be ground in one-step processing molding without turning and grinding, the lower bearing seat is not required to be specially arranged as an assembly, the structural design is more free, the number of parts can be reduced, the clamping frequency can be reduced, the, the whole machine can be assembled and molded at one time without match grinding, so that the assembly procedures are reduced, the assembly precision and the assembly yield are improved, and the assembly cost is reduced; and the stop collar does not need to match and grind, allows to change wantonly, need not to pair, and part interchangeability is better, and the maintenance degree of difficulty descends.
The lower bearing of annular locating surface axial positioning, the mounted position of stop collar is injectd to the second locating surface, and annular locating surface and second locating surface are all arranged down, and part size chain precision is easily guaranteed, and part one shot forming need not the grinding of turning round, therefore the machining precision and the assembly precision of realizing are higher, and the complete machine one shot forming need not to join in marriage the mill simultaneously, has reduced assembly cost.
Drawings
The invention is further described with reference to the following figures and detailed description.
Fig. 1 is a partial cross-sectional view of a first limiting structure in the prior art.
Fig. 2 is a partial cross-sectional view of a second limiting structure in the prior art.
Fig. 3 is one of partial sectional views illustrating a spindle relief limiting structure according to an embodiment.
Fig. 4 is a perspective view of an embodiment stop collar.
Figure 5 is a cross-sectional schematic view of an embodiment of a stop collar.
Fig. 6 is a second partial sectional view of the spindle dismounting tool spacing structure according to the embodiment, in which the spacing sleeve is not shown.
Fig. 7 is a partially enlarged schematic view of a portion a of fig. 3.
Detailed Description
Referring to fig. 3 to 7, the spindle dismounting tool limiting structure includes a spindle 10, a machine body 20, and a limiting sleeve 30. The main shaft 10 can rotate relative to the machine body 20, an upper bearing seat and a lower bearing seat 21 are fixedly installed in the machine body 20, an upper bearing is arranged between the upper bearing seat and the main shaft 10, a lower bearing 22 is arranged between the lower bearing seat 21 and the main shaft 10, and the upper bearing seat and the lower bearing seat are arranged up and down. The lower bearing 22 is closer to the tool mounting location than the upper bearing.
The lower bearing seat 21 has an outer peripheral wall 211 and an upper annular projection 212 formed by extending an upper inner end portion of the outer peripheral wall 211 inward, the upper annular projection 212 has a downward end face, the lower bearing 22 is disposed in the outer peripheral wall 211 and abuts against the downward end face of the upper annular projection 212, and the end face constitutes an annular positioning surface 213 for axially positioning the lower bearing 22. The annular positioning surface 213 is concavely provided with a positioning groove 214, the positioning groove 214 is provided at a portion of the annular positioning surface 213 close to the spindle 10, for example, a notch is formed so that the positioning groove 214 forms an annular step structure, and the positioning groove 214 is a circular groove coaxial with the spindle 10. The groove bottom of the positioning groove 214 forms a second positioning surface, which is also arranged downward, i.e. the annular positioning surface and the second positioning surface are both arranged downward and in the same direction.
The stop collar 30 has a mounting portion 31 and a positioning portion 32 that are connected, including a fixed connection, such as an integral molding. If the limiting sleeve is made of wear-resistant and self-lubricating materials such as tin bronze, the limiting sleeve is beneficial to effectively avoiding the axle center from being locked when the nut is accidentally scraped with the axle center step.
The position limiting sleeve 30 is connected with the lower bearing seat 21 through the mounting part 31, and the mounting position of the position limiting sleeve 30 is limited by the abutting of the positioning part 32 against the bottom (groove bottom) of the positioning groove 214.
The limiting sleeve 30 is internally provided with a through hole 33 which penetrates up and down. The main shaft 10 is provided with a shaft shoulder 11, the stop sleeve 30 is provided with a supporting surface 34, and the main shaft 10 passes through the through hole 33 of the stop sleeve 30 and limits the moving distance of the main shaft 10 in the tool unloading process through the cooperation of the supporting surface 34 and the shaft shoulder 11. In one embodiment, the support surface 34 is an upwardly facing surface of the stop collar 30, the upwardly facing surface is an annular flat surface, and the annular locating surface 213 is disposed downwardly.
In one embodiment, the annular locating surface 213 is adjacent to the tool mounting location, and the support surface 34 is an end surface of the stop collar 30 that is perpendicular to the spindle at an end remote from the tool mounting location; the main shaft 10 passes through the through hole 33 of the position-limiting sleeve 30 and a gap is left between the position-limiting sleeve 30 and the main shaft 10; a gap is left between the shoulder 11 and the support surface 34 to prevent the stop collar 30 from contacting the spindle 10 under normal operating conditions.
In one embodiment, the positioning portion 32 is closer to the annular positioning surface 213 than the mounting portion 31, the mounting portion 31 and the positioning portion 32 are both annular, the diameter of the outer circumferential surface of the positioning portion 32 is larger than the diameter of the outer circumferential surface of the mounting portion 31, and the positioning portion 32 is disposed in the positioning groove 214. The support surface 34 is higher than the top end surface of the lower bearing housing 21.
In another embodiment, the mounting portion is closer to the annular positioning surface 213 than the positioning portion, the mounting portion and the positioning portion are disposed in the positioning groove 214, and the mounting portion is connected to the lower bearing housing 21 by being connected to the sidewall of the positioning groove 214. The detent rests via the support surface 34 against the groove base of the detent recess 214. As an alternative embodiment, the mounting portion 31 of the stop collar 30 is threaded onto the lower bearing housing 21.
In one embodiment, the mounting portion 31 of the stop collar 30 is threaded into the inner bore of the upper collar 212 of the lower bearing seat 21, the mounting portion 31 is provided with external threads, and the inner bore of the upper collar 212 of the lower bearing seat 21 is correspondingly provided with internal threads.
In another embodiment, the mounting portion 31 of the position limiting sleeve 30 is screwed with the side wall of the positioning groove 214, the mounting portion 31 is provided with external threads, and the side wall of the positioning groove 214 is provided with internal threads.
The external thread and the internal thread are cylindrical threads, and the axes of the external thread and the internal thread are coincident with the axis of the main shaft.
Other structures such as screw fasteners, adhesives, welds or snap connections may be used as desired.
In a specific embodiment, the stop collar 30 is provided with a plurality of tool grooves 35 for mounting the stop collar on an end surface close to the lower bearing, the plurality of tool grooves 35 are annularly distributed coaxially with the main shaft 10, the tool grooves 35 extend along the axial direction of the main shaft 10, the tool grooves 35 are communicated with the through hole 33, and the depth of the tool grooves 35 is less than half of the length of the stop collar 30 in the axial direction of the main shaft 10. Through setting up frock groove 35, convenient to use frock clamping stop collar 30 locks stop collar 30 with bigger moment of torsion to it bonds to assist with the thread glue, makes stop collar 30's locking effect better.
In another embodiment, the stop collar 30 is provided with a tool slot in the through hole 33.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (12)
1. The utility model provides a main shaft unloads sword limit structure which characterized in that: the main shaft can rotate relative to the machine body, the machine body is provided with a lower bearing seat, and a lower bearing is arranged between the lower bearing seat and the main shaft; the lower bearing seat is provided with an annular positioning surface for axially positioning the lower bearing, and the annular positioning surface is concavely provided with a positioning groove; the limiting sleeve is provided with a mounting part and a positioning part which are connected; the limiting sleeve is connected with the lower bearing seat through the mounting part, and the positioning part is abutted against the bottom of the positioning groove to limit the mounting position of the limiting sleeve; the main shaft is provided with a shaft shoulder, the limiting sleeve is provided with a supporting surface, and the main shaft penetrates through the limiting sleeve and is matched with the shaft shoulder through the supporting surface to limit the moving distance of the main shaft in the cutter unloading process.
2. The main shaft cutter-unloading limiting structure according to claim 1, characterized in that: this stop collar and step threaded connection, this installation department are equipped with the external screw thread, and this step is equipped with the internal thread correspondingly, and this external screw thread and internal thread all are cylindrical thread, and the axis coincidence of this external screw thread and internal thread and main shaft.
3. The main shaft cutter-unloading limiting structure according to claim 2, characterized in that: the positioning part is closer to the annular positioning surface than the mounting part, the mounting part and the positioning part are both annular, the diameter of the outer peripheral surface of the positioning part is larger than that of the outer peripheral surface of the mounting part, and the positioning part is arranged in the positioning groove.
4. The main shaft cutter-unloading limiting structure according to claim 2, characterized in that: the installation part is closer to the annular positioning surface than the positioning part, the installation part and the positioning part are both annular, the diameter of the outer peripheral surface of the installation part is larger than that of the outer peripheral surface of the positioning part, the internal thread is positioned on the side wall of the positioning groove, and the installation part and the positioning part are both arranged in the positioning groove.
5. The main shaft cutter-unloading limiting structure according to claim 1, characterized in that: the positioning groove is arranged on the annular positioning surface and close to the main shaft; the positioning groove includes a circular groove coaxial with the main shaft.
6. The main shaft cutter-unloading limiting structure according to claim 1, characterized in that: the annular positioning surface is close to the cutter mounting position, and the supporting surface is an end surface, perpendicular to the main shaft, of one end, far away from the cutter mounting position, of the limiting sleeve.
7. The main shaft cutter-unloading limiting structure according to claim 1, characterized in that: the annular positioning surface is arranged downwards, and the supporting surface is the upward end surface of the limiting sleeve.
8. The main shaft cutter-unloading limiting structure according to claim 1, characterized in that: the limit sleeve is provided with a through hole, the main shaft passes through the through hole of the limit sleeve, and a gap is reserved between the limit sleeve and the main shaft; a gap is reserved between the shaft shoulder and the supporting surface and used for preventing the limiting sleeve from contacting with the main shaft under normal working conditions.
9. The main shaft cutter-unloading limiting structure according to claim 8, wherein: the end surface of the limiting sleeve close to the lower bearing or the side wall of the through hole is concavely provided with a tool groove for installing the limiting sleeve.
10. The main shaft cutter-unloading limiting structure according to claim 9, wherein: the limiting sleeve is provided with a plurality of tool grooves for installing the limiting sleeve on the end face close to the lower bearing, the tool grooves are distributed in an annular mode coaxially with the main shaft, the tool grooves extend along the axial direction of the main shaft and are communicated with the through hole, and the depth of each tool groove is smaller than half of the axial length of the limiting sleeve on the main shaft.
11. The main shaft cutter-unloading limiting structure according to claim 1, characterized in that: the limiting sleeve is made of wear-resistant and self-lubricating materials.
12. The main shaft unloads sword limit structure, its characterized in that: the main shaft can rotate relative to the machine body, the machine body is provided with a lower bearing seat, and a lower bearing is arranged between the lower bearing seat and the main shaft; the limiting sleeve is provided with a mounting part and a positioning part which are connected; the lower bearing seat is provided with an annular positioning surface for axially positioning the lower bearing and a second positioning surface for axially positioning the limiting sleeve, and the annular positioning surface and the second positioning surface are both arranged downwards; the limiting sleeve is connected with the lower bearing seat through the mounting part, and the mounting position of the limiting sleeve is limited by the positioning part abutting against the second positioning surface; the main shaft is provided with a shaft shoulder, the limiting sleeve is provided with a supporting surface, and the main shaft penetrates through the limiting sleeve and is matched with the shaft shoulder through the supporting surface to limit the moving distance of the main shaft in the cutter unloading process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226339.2A CN111069633A (en) | 2019-12-04 | 2019-12-04 | Main shaft cutter unloading limiting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226339.2A CN111069633A (en) | 2019-12-04 | 2019-12-04 | Main shaft cutter unloading limiting structure |
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| Publication Number | Publication Date |
|---|---|
| CN111069633A true CN111069633A (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911226339.2A Pending CN111069633A (en) | 2019-12-04 | 2019-12-04 | Main shaft cutter unloading limiting structure |
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| CN (1) | CN111069633A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846256A (en) * | 2021-02-20 | 2021-05-28 | 广州市昊志机电股份有限公司 | Heavy-load electric spindle and machine tool |
-
2019
- 2019-12-04 CN CN201911226339.2A patent/CN111069633A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846256A (en) * | 2021-02-20 | 2021-05-28 | 广州市昊志机电股份有限公司 | Heavy-load electric spindle and machine tool |
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