CN113513543A - Flange connection overtorque protection device - Google Patents
Flange connection overtorque protection device Download PDFInfo
- Publication number
- CN113513543A CN113513543A CN202110283577.8A CN202110283577A CN113513543A CN 113513543 A CN113513543 A CN 113513543A CN 202110283577 A CN202110283577 A CN 202110283577A CN 113513543 A CN113513543 A CN 113513543A
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- flange
- shaft
- bearing seat
- outer ring
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- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D9/00—Couplings with safety member for disconnecting, e.g. breaking or melting member
- F16D9/06—Couplings with safety member for disconnecting, e.g. breaking or melting member by breaking due to shear stress
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention discloses a flange connection overtorque protection device, which comprises a bearing seat connecting flange, a flange shaft, an outer ring baffle, a round nut, an inner ring bushing, an outer ring bushing and a ball bearing, wherein the flange shaft comprises a journal section and a flange section, the bearing seat connecting flange is sleeved outside the journal section and is connected with the end surface of the flange section, an inner cylindrical surface of the bearing seat connecting flange and an outer cylindrical surface of the journal section form an annular cavity, the ball bearing is arranged in the annular cavity, the inner ring bushing and the outer ring bushing are arranged between adjacent ball bearings, the outer cylindrical surface of the outer ring bushing is attached to the inner cylindrical surface of the bearing seat connecting flange, the end surface of the outer ring bushing is attached to the end surface of the outer ring of the adjacent ball bearing, the inner cylindrical surface of the inner ring bushing is attached to the outer cylindrical surface of the journal section, the end surface of the inner ring bushing is attached to the end surface of the adjacent inner ring bushing, the round nut is arranged on the journal section of the flange and is attached to the end surface of the ball bearing at the outermost side of the journal section, the outer ring baffle is arranged on the end face of the connecting flange of the bearing seat and is attached to the end face of the outer ring of the ball bearing at the outermost side of the shaft neck section.
Description
Technical Field
The invention relates to the technical field of limit installation of speed reducers, in particular to a flange connection overtorque protection device.
Background
When the speed reducer casing is tested, a driving motor is required to provide power, the motor rotates to drive the speed regulating gear box, and the speed regulating gear box transmits the power required by the speed reducer casing to the input shaft of the speed reducer casing. The output shaft of the speed regulating gear box and the input shaft of the speed reducer casing are connected by a transmission shaft, the connecting structure generally adopts a flange structure, and the flanges are connected and fastened by parts such as a diaphragm coupling, a bolt, a nut and the like.
This transmission structure has the following problems: firstly, the bolts are prone to fatigue failure after long-term use, and in addition, when a power gear box or a speed reducer casing has mechanical failure, the torque at the flange connection part exceeds a specified value, the bolts at the flange part may be broken, and relative rotation is generated between the flanges. Under the condition, damage can be caused to the mounting flange of a product, and under the serious condition, the damage can be caused to the related structure of a transmission chain in the speed reducer, so that great loss is generated. Secondly, under the condition of high speed and heavy load, once the connecting bolt fails, the rotation of the speed regulating gear box can not be stopped in a short time under the action of inertia, the speed regulating gear box still can drive the transmission shaft to rotate, and the transmission shaft can fly out due to the fact that one side of the transmission shaft can not be fixed, so that secondary damage is caused to a speed reducer casing and other equipment.
At present, no special literature document is introduced and referred to for a device for over-torque protection between a product flange and an equipment flange, and no safe and effective implementation scheme exists in China.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a device capable of protecting the over-torque between two flange shafts, overcomes the defect that a product is damaged once a fastener between flanges fails in the prior art, and better protects the product and equipment on the premise of ensuring the reliability in the test process.
The technical scheme of the invention is as follows:
a flange connection overtorque protection device comprises a bearing seat connecting flange 1, a flange shaft 2, an outer ring baffle 3, a round nut 5, an inner ring bushing 8, an outer ring bushing 9 and at least two sets of ball bearings 7, wherein the bearing seat connecting flange 1 and the flange shaft 2 are of cylindrical hollow structures, the flange shaft 2 comprises a journal section and a flange section, the bearing seat connecting flange 1 is sleeved outside the journal section of the flange shaft 2 and is connected with the end surface of the flange section of the flange shaft 2, an inner cylindrical surface of the bearing seat connecting flange 1 and an outer cylindrical surface of the journal section of the flange shaft 2 form an annular cavity, the at least two sets of ball bearings 7 are arranged in the annular cavity, the inner ring bushing 8 and the outer ring bushing 9 are arranged between every two adjacent ball bearings 7, an outer cylindrical surface of the outer ring bushing 9 is attached to the inner cylindrical surface of the bearing seat connecting flange 1, two end surfaces of the outer ring bushing 9 are attached to the outer ring end surfaces of the two adjacent sets of ball bearings 7, the inner cylindrical surface of the inner ring bushing 8 is attached to the outer cylindrical surface of the flange shaft 2 journal section, two end surfaces of the inner ring bushing 8 are attached to inner ring end surfaces of two adjacent sets of ball bearings 7, the round nut 5 is arranged on the flange shaft 2 journal section, the round nut 5 is attached to the inner ring end surface of the ball bearing 7 on the outermost side of the flange shaft 2 journal section, the outer ring baffle 3 is arranged on the end surface of the bearing seat connecting flange 1 and is attached to the outer ring end surface of the ball bearing 7 on the outermost side of the flange shaft 2 journal section, and the round nut 5 and the outer ring baffle 3 are used for limiting the ball bearings 7 from moving in the flange shaft 2 journal section along the axial direction.
Furthermore, the bearing seat connecting flange 1 is connected with the flange section of the flange shaft 2 through a hinged hole bolt, so that the hinged hole bolt is tightly matched with the connecting holes of the bearing seat connecting flange 1 and the flange shaft 2, and the hinged hole bolt has strong shock resistance.
Further, the locking device also comprises a circular nut locking washer 6, wherein the circular nut locking washer 6 is arranged between the circular nut 5 and the end face of the inner ring of the ball bearing 7 at the outermost side of the shaft neck section of the flange shaft 2, and can prevent the circular nut 5 from loosening.
Further, the outer end face of the bearing seat connecting flange 1 is provided with a connecting hole connected with the input shaft of the speed reducer casing.
Furthermore, the outer end face of the flange section of the flange shaft 2 is provided with a first connecting hole connected with an output shaft of the speed regulating gear box.
Furthermore, the outer ring baffle 3 is fixed on the end face of the bearing seat connecting flange 1 through a fastening screw 4.
Further, an inner ring bushing 8 is also arranged between the end surface of the inner ring of the ball bearing 7 at the innermost side of the journal section of the flange shaft 2 and the end surface of the inner side of the flange section.
Further, the bearing seat connecting flange 1, the flange shaft 2, the outer ring baffle 3, the inner ring bushing 8 and the outer ring bushing 9 are made of carbon steel or alloy steel.
The invention has the beneficial effects that:
the invention provides a flange connection overtorque protection device, which can ensure normal connection between flanges and has no influence on product structures and equipment structures. Secondly, when the connecting bolt is damaged, the structure of the product can not be damaged. Finally, when the connecting bolt is damaged, the connecting shaft can be prevented from flying out, and further damage to products and equipment can be avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein: 1-bearing seat connecting flange, 2-flange shaft, 3-outer ring baffle, 4-fastening screw, 5-round nut, 6-round nut stop washer, 7-ball bearing, 8-inner ring bushing, 9-outer ring bushing, 10-ball bearing and 11-inner ring bushing.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes, configurations, mutual positions and connection relationships of the components, the functions and operating principles of the components, the manufacturing processes and the operation and use methods thereof, will be further described in detail with reference to the accompanying drawings, so as to help those skilled in the art to more completely, accurately and deeply understand the concept and technical solutions of the present invention:
one embodiment of the invention:
as shown in figure 1, the flange connection overtorque protection device comprises a bearing seat connecting flange 1, a flange shaft 2, an outer ring baffle 3, a fastening screw 4, a round nut 5, a round nut lock washer 6, an inner ring bushing 8, an outer ring bushing 9 and at least two sets of ball bearings 7, wherein the bearing seat connecting flange 1 and the flange shaft 2 are both in a cylindrical hollow structure, the flange shaft 2 comprises a journal section and a flange section, the bearing seat connecting flange 1 is sleeved outside the journal section of the flange shaft 2, the bearing seat connecting flange 1 is connected with the flange section of the flange shaft 2 through a hinge hole bolt, the hinge hole bolt is tightly matched with connecting holes of the bearing seat connecting flange 1 and the flange shaft 2, the hinge hole bolt has strong shock resistance, an inner cylindrical surface of the bearing seat connecting flange 1 and an outer cylindrical surface of the journal section of the flange shaft 2 form an annular cavity, and the at least two sets of ball bearings 7 are arranged in the annular cavity, an inner ring bushing 8 and an outer ring bushing 9 are arranged between every two adjacent ball bearings 7, and an inner ring bushing 8 is also arranged between the end surface of the inner ring of the ball bearing 7 at the innermost side of the journal section of the flange shaft 2 and the end surface of the inner side of the flange section; the outer cylindrical surface of the outer ring bush 9 is jointed with the inner cylindrical surface of the bearing seat connecting flange 1, two end surfaces of the outer ring bush 9 are jointed with the outer ring end surfaces of two adjacent sets of ball bearings 7, the inner cylindrical surface of the inner ring bush 8 is jointed with the outer cylindrical surface of the flange shaft 2 journal section, two end surfaces of the inner ring bush 8 are jointed with the inner ring end surfaces of two adjacent sets of ball bearings 7, the round nut 5 is arranged on the flange shaft 2 journal section, and the round nut 5 is jointed with the end surface of the inner ring of the ball bearing 7 at the outermost side of the shaft neck section of the flange shaft 2, the outer ring baffle 3 is fixed on the end surface of the bearing seat connecting flange 1 through a fastening screw 4, and the end surface of the outer ring of the ball bearing 7 at the outermost side of the shaft neck section of the flange shaft 2 is attached, and the round nut 5 and the outer ring baffle 3 are used for limiting the ball bearing 7 from moving in the shaft neck section of the flange shaft 2 along the axial direction. The round nut stop washer 6 is arranged between the round nut 5 and the end surface of the inner ring of the ball bearing 7 at the outermost side of the journal section of the flange shaft 2, and can prevent the round nut 5 from loosening.
The outer end face of the bearing seat connecting flange 1 is provided with a connecting hole connected with an input shaft of a speed reducer casing, and the outer end face of the flange section of the flange shaft 2 is provided with a connecting hole I connected with an output shaft of the speed regulating gear box.
Further, the bearing seat connecting flange 1, the flange shaft 2, the outer ring baffle 3, the inner ring bushing 8 and the outer ring bushing 9 are made of carbon steel or alloy steel, and the alloy steel is high in mechanical strength, good in plastic toughness, good in welding performance and good in hot-pressing processing performance.
Another embodiment of the invention:
the specific scheme of the invention is as follows: the flange sections of the bearing seat connecting flange 1 and the flange shaft 2 are connected by using a hinged hole bolt, namely a connecting bolt. Firstly, an inner ring bushing 8 is arranged on the inner side of a shaft neck section of the flange shaft 2, then a ball bearing 7, the rest inner ring bushings 8, an outer ring bushing 9 and the ball bearing 7 are sequentially arranged, the ball bearing 7 is locked on the flange shaft 2 through a round nut 5 and a round nut stop washer 6, and finally, an outer ring baffle 3 is arranged to complete assembly.
In the use process, the outer end face of the bearing seat connecting flange 1 is connected with an input shaft of a speed reducer casing, and the outer end face of the flange section of the flange shaft 2 is connected with an output shaft of a speed regulating gear box. According to parameters such as rotating speed, torque and power at the input shaft of the speed reducer casing, allowable shear stress of connecting bolts at the connecting position of the inner end face of the bearing seat connecting flange 1 and the inner end face of the flange section of the flange shaft 2 is calculated, the specification of the connecting bolts at the connecting position of the inner end face of the bearing seat connecting flange 1 and the inner end face of the flange section of the flange shaft 2 is determined, and when the bolt stress exceeds a specified range, the connecting bolts can be sheared off, and the flange between the bearing seat connecting flange 1 and the flange shaft 2 can rotate relatively. The strength requirement of the fastening bolt is greater than the strength of the connecting bolt at the connecting position of the inner end surface of the bearing seat connecting flange 1 and the inner end surface of the flange section of the flange shaft 2 at the connecting position of the outer end surface of the flange section of the flange shaft 1 and the output shaft of the speed regulating gear box, so that when the connecting bolt at the connecting position of the inner end surface of the bearing seat connecting flange 1 and the inner end surface of the flange section of the flange shaft 2 is sheared, the connecting bolt at the connecting position of the outer end surface of the bearing seat connecting flange 1 and the input shaft of the speed reducer box and the connecting bolt at the connecting position of the outer end surface of the flange section of the flange shaft 2 and the output shaft of the speed regulating gear box cannot be damaged, the flanges at the two positions cannot rotate relatively, and the input shaft of the speed reducer box and the output shaft of the speed regulating gear box can be protected.
A third embodiment of the invention:
the working process of the invention is as follows: when the device is used, the connection bolt at the connection position of the inner end surface of the connecting flange 1 of the bearing seat and the inner end surface of the flange section of the flange shaft 2 is checked to be fixed and fastened. The outer end face of the bearing seat connecting flange 1 is connected with an input shaft of a casing of the speed reducer in a flange mode, and the outer end face of the flange section of the flange shaft 2 is connected with an output shaft of the speed regulating gear box. In the normal transmission process, the bearing seat connecting flange 1 and the flange shaft 2 synchronously rotate without relative rotation, and can normally play a role in transmitting torque. When a product or equipment is in fault, the transmitted torque exceeds the normal working range, the connecting bolt at the connecting part of the inner end surface of the bearing seat connecting flange 1 and the inner end surface of the flange section of the flange shaft 2 is sheared due to exceeding the allowable shearing stress, the bearing seat connecting flange 1 and the flange shaft 2 rotate relatively, and the ball bearing 7 arranged on the bearing seat connecting flange 1 can ensure that the bearing seat connecting flange 1 and the flange shaft 2 cannot be separated, but rotate relatively due to different rotating speeds, so that an operator can stop the equipment in time for inspection.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (8)
1. The utility model provides a flange joint surpasses turns round protection device which characterized in that: the bearing seat connecting flange comprises a bearing seat connecting flange (1), a flange shaft (2), an outer ring baffle plate (3), a round nut (5), an inner ring bushing (8), an outer ring bushing (9) and at least two sets of ball bearings (7), wherein the bearing seat connecting flange (1) and the flange shaft (2) are of cylindrical hollow structures, the flange shaft (2) comprises a journal section and a flange section, the bearing seat connecting flange (1) is sleeved outside the journal section of the flange shaft (2) and is connected with the end face of the flange section of the flange shaft (2), the inner cylindrical surface of the bearing seat connecting flange (1) and the outer cylindrical surface of the journal section of the flange shaft (2) form an annular ball bearing cavity, the at least two sets of ball bearings (7) are arranged in the annular ball bearing cavity, the inner ring bushing (8) and the outer ring bushing (9) are arranged between every two adjacent ball bearings (7), the outer cylindrical surface of the outer ring bushing (9) is attached to the inner circle of the bearing seat connecting flange (1), two end surfaces of the outer ring bush (9) are jointed with the outer ring end surfaces of two adjacent sets of ball bearings (7), the inner cylindrical surface of the inner ring bush (8) is jointed with the outer cylindrical surface of the journal section of the flange shaft (2), two end faces of the inner ring bush (8) are attached to the inner ring end faces of two adjacent sets of ball bearings (7), the round nut (5) is arranged on the journal section of the flange shaft (2), and the round nut (5) is jointed with the end surface of the inner ring of the ball bearing (7) at the outermost side of the journal section of the flange shaft (2), the outer ring baffle (3) is arranged on the end surface of the bearing seat connecting flange (1), is attached to the end surface of the outer ring of the ball bearing (7) at the outermost side of the journal section of the flange shaft (2), the round nut (5) and the outer ring baffle (3) are used for limiting the ball bearing (7) from moving in the axial direction at the journal section of the flange shaft (2).
2. A flange joint overtorque protection device as claimed in claim 1, wherein: the bearing seat connecting flange (1) is connected with the flange section of the flange shaft (2) through a hinged hole bolt.
3. A flange joint overtorque protection device as claimed in claim 1, wherein: the flange shaft locking device is characterized by further comprising a round nut locking washer (6), wherein the round nut locking washer (6) is arranged between the round nut (5) and the end face of the inner ring of the outermost side ball bearing (7) of the shaft neck section of the flange shaft (2).
4. A flange joint overtorque protection device as claimed in claim 1, wherein: and a connecting hole connected with an input shaft of the speed reducer casing is formed in the outer end face of the bearing seat connecting flange (1).
5. A flange joint overtorque protection device as claimed in claim 1, wherein: and the outer end surface of the flange section of the flange shaft (2) is provided with a connecting hole connected with an output shaft of the speed regulating gear box.
6. A flange joint overtorque protection device as claimed in claim 1, wherein: the outer ring baffle (3) is fixed on the end face of the bearing seat connecting flange (1) through a fastening screw (4).
7. A flange joint overtorque protection device as claimed in claim 1, wherein: an inner ring bushing (8) is also arranged between the end surface of the inner ring of the innermost ball bearing (7) of the journal section of the flange shaft (2) and the end surface of the inner side of the flange section.
8. A flange joint overtorque protection device as claimed in claim 1, wherein: the bearing seat connecting flange (1), the flange shaft (2), the outer ring baffle (3), the inner ring bushing (8) and the outer ring bushing (9) are made of carbon steel or alloy steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283577.8A CN113513543A (en) | 2021-03-16 | 2021-03-16 | Flange connection overtorque protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283577.8A CN113513543A (en) | 2021-03-16 | 2021-03-16 | Flange connection overtorque protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113513543A true CN113513543A (en) | 2021-10-19 |
Family
ID=78061777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110283577.8A Pending CN113513543A (en) | 2021-03-16 | 2021-03-16 | Flange connection overtorque protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113513543A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058163A (en) * | 2007-05-22 | 2007-10-24 | 江南大学 | Curve abrasive band grinding and cutting flexible grinding wheel |
| CN101162027A (en) * | 2007-11-23 | 2008-04-16 | 江苏省徐州锻压机床厂集团有限公司 | Press compound bearing |
| CN201723611U (en) * | 2010-06-23 | 2011-01-26 | 常州精瑞自动化装备技术有限公司 | Torque limiter |
| CN204387130U (en) * | 2014-12-10 | 2015-06-10 | 广州市昊志机电股份有限公司 | A kind of novel bearing pre-pressing structure |
| CN105065484A (en) * | 2015-09-07 | 2015-11-18 | 中国船舶重工集团公司第七�三研究所 | High-speed overtorque protection device |
| CN204900587U (en) * | 2015-09-07 | 2015-12-23 | 中国船舶重工集团公司第七�三研究所 | High -speed overtorque protection device |
| CN108871674A (en) * | 2018-09-11 | 2018-11-23 | 西安交通大学 | A kind of built-in on-line dynamic balancing device experiment platform of main shaft |
| CN208760629U (en) * | 2018-09-18 | 2019-04-19 | 成都市新筑路桥机械股份有限公司 | A kind of guiding device of suspension type monorail bogie |
| CN209811814U (en) * | 2019-01-25 | 2019-12-20 | 大族激光科技产业集团股份有限公司 | Chuck seat |
| CN210526878U (en) * | 2019-07-09 | 2020-05-15 | 中国航发哈尔滨东安发动机有限公司 | Analog loading accessory device |
| CN111536915A (en) * | 2020-06-05 | 2020-08-14 | 上海合纵重工机械有限公司 | Measuring device for axial position adjustment amount of annular worm and using method thereof |
| CN211343741U (en) * | 2019-07-09 | 2020-08-25 | 中国航发哈尔滨东安发动机有限公司 | Bearing bush |
| CN112064386A (en) * | 2020-08-28 | 2020-12-11 | 湖北三江航天江北机械工程有限公司 | Double-twisting machine rotating shaft system device, double-twisting machine with same and machining and assembling method of double-twisting machine rotating shaft system device |
-
2021
- 2021-03-16 CN CN202110283577.8A patent/CN113513543A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058163A (en) * | 2007-05-22 | 2007-10-24 | 江南大学 | Curve abrasive band grinding and cutting flexible grinding wheel |
| CN101162027A (en) * | 2007-11-23 | 2008-04-16 | 江苏省徐州锻压机床厂集团有限公司 | Press compound bearing |
| CN201723611U (en) * | 2010-06-23 | 2011-01-26 | 常州精瑞自动化装备技术有限公司 | Torque limiter |
| CN204387130U (en) * | 2014-12-10 | 2015-06-10 | 广州市昊志机电股份有限公司 | A kind of novel bearing pre-pressing structure |
| CN105065484A (en) * | 2015-09-07 | 2015-11-18 | 中国船舶重工集团公司第七�三研究所 | High-speed overtorque protection device |
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| CN108871674A (en) * | 2018-09-11 | 2018-11-23 | 西安交通大学 | A kind of built-in on-line dynamic balancing device experiment platform of main shaft |
| CN208760629U (en) * | 2018-09-18 | 2019-04-19 | 成都市新筑路桥机械股份有限公司 | A kind of guiding device of suspension type monorail bogie |
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| CN211343741U (en) * | 2019-07-09 | 2020-08-25 | 中国航发哈尔滨东安发动机有限公司 | Bearing bush |
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| CN112064386A (en) * | 2020-08-28 | 2020-12-11 | 湖北三江航天江北机械工程有限公司 | Double-twisting machine rotating shaft system device, double-twisting machine with same and machining and assembling method of double-twisting machine rotating shaft system device |
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Application publication date: 20211019 |