CN113460637B - Adjustable full-size ship upset frock - Google Patents
Adjustable full-size ship upset frock Download PDFInfo
- Publication number
- CN113460637B CN113460637B CN202110852134.6A CN202110852134A CN113460637B CN 113460637 B CN113460637 B CN 113460637B CN 202110852134 A CN202110852134 A CN 202110852134A CN 113460637 B CN113460637 B CN 113460637B
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- Prior art keywords
- roller
- adjustable
- linear driving
- conveying roller
- conveyor belt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/22—Devices influencing the relative position or the attitude of articles during transit by conveyors
- B65G47/24—Devices influencing the relative position or the attitude of articles during transit by conveyors orientating the articles
- B65G47/248—Devices influencing the relative position or the attitude of articles during transit by conveyors orientating the articles by turning over or inverting them
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64B—LIGHTER-THAN AIR AIRCRAFT
- B64B1/00—Lighter-than-air aircraft
- B64B1/02—Non-rigid airships
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/60—Arrangements for supporting or guiding belts, e.g. by fluid jets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
- B65G21/10—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof
- B65G21/12—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof to allow adjustment of position of load-carrier or traction element as a whole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
- B65G21/10—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof
- B65G21/14—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof to allow adjustment of length or configuration of load-carrier or traction element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/02—Belt- or chain-engaging elements
- B65G23/04—Drums, rollers, or wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G41/00—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames
- B65G41/001—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames with the conveyor adjustably mounted on the supporting frame or base
- B65G41/003—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames with the conveyor adjustably mounted on the supporting frame or base mounted for linear movement only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses an adjustable full-size boat overturning tool which comprises a plurality of pairs of conveyor belt units, wherein each conveyor belt unit comprises a frame body, a first linear driving piece, a second linear driving piece, a conveyor belt, a first adjustable conveying roller, a second adjustable conveying roller, a tensioning roller, a driving roller, a tensioning roller sliding frame and an upright post; the first adjustable conveying roller is rotatably arranged at one end of the frame body through the first linear driving piece, and the second adjustable conveying roller is rotatably arranged at the other end of the frame body through the second linear driving piece and the upright post; the rotating shafts at the two ends of the tensioning roller are arranged in the sliding grooves of the tensioning roller sliding frame in a sliding manner; the rotating shafts at two ends of the driving roller are arranged on the frame body through bearings, and the rotating shaft at one end of the driving roller is in transmission connection with the rotary driving mechanism. The invention can be matched with the capsule body under different capsule body shapes, so as to avoid the phenomenon that the traditional conveying equipment conveyor belt can locally gather due to the non-uniform diameter of the contact surface, thereby enabling the capsule body to turn over at a larger angle and meeting the requirement of turning over the capsule body shape of the airship.
Description
Technical Field
The invention relates to the technical field of overturning tools, in particular to an adjustable full-size boat overturning tool.
Background
An airship is an aircraft that is buoyant by helium as a buoyant gas. In particular, the skin material of the stratospheric airship is a laminated composite material consisting of a weather-resistant layer, a barrier layer, a fabric layer and a bonding layer, and in the airship assembling process, in order to reduce the assembling difficulty, a turnover tool for the airship capsule body needs to be configured so that the equipment is more convenient to install and maintain, and the turnover tool is required to have the characteristics of simplicity and convenience in use, no damage to the capsule body, no interference to the equipment installation and the like. Therefore, the overturning tool is one device in the process of assembling the airship assembly.
Airship overturning tool mainly comprises two modes at present: one is to pull the mooring rope connected with the bag body through a winch so as to realize the overturning of the bag body, and the other is to drive the bag body to overturn through arranging overturning rolling equipment below the bag body. The winch pulls the mooring rope to drive the bag body to turn over, so that the bag body is only applicable to cylindrical bag bodies, and the application range is small; when the rolling equipment drives the bag body to turn over, if the bag body is streamline, the conveying belt can locally gather due to the non-uniform diameter of the contact surface, and the bag body is difficult to turn over at a larger angle.
Therefore, how to provide an adjustable full-scale boat overturning tool is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides an adjustable full-sized boat overturning tool, which solves at least one of the problems set forth in the background art section.
In order to realize the scheme, the invention adopts the following technical scheme:
the adjustable full-size boat overturning tool comprises a plurality of pairs of conveyor belt units, wherein each conveyor belt unit comprises a frame body, a first linear driving piece, a second linear driving piece, a conveyor belt, a first adjustable conveying roller, a second adjustable conveying roller, a tensioning roller, a driving roller, a tensioning roller sliding frame and an upright post;
the first adjustable conveying roller is rotatably arranged at one end of the frame body through the first linear driving piece, and the second adjustable conveying roller is rotatably arranged at the other end of the frame body through the second linear driving piece and the upright post; the tensioning roller and the driving roller are arranged below the second adjustable conveying roller; the conveyor belt is wound on the first adjustable conveying roller, the second adjustable conveying roller, the tensioning roller and the driving roller; the rotating shafts at two ends of the tensioning roller are arranged in the sliding grooves of the tensioning roller sliding frame in a sliding manner, and the tensioning roller sliding frame is fixedly arranged on the frame body; the rotating shafts at two ends of the driving roller are arranged on the frame body through bearings, and the rotating shaft at one end of the driving roller is in transmission connection with the rotary driving mechanism.
According to the invention, the heights and angles of the first adjustable conveying roller and the second adjustable conveying roller can be adjusted through the first linear driving piece and the second linear driving piece, so that the conveyor belt can be matched with the radian of the bag body, the larger application range of the turnover tool is ensured, and the turnover tool is suitable for different diameters.
Preferably, in the above-mentioned adjustable full-size boat overturning tool, two ends of the first adjustable conveying roller are respectively mounted on two linear moving parts of the first linear driving piece through bearings, and the first linear driving piece is mounted on the frame body.
Preferably, in the above-mentioned adjustable full-size boat overturning tool, two ends of the second adjustable conveying roller are respectively mounted on the linear moving parts of the two second linear driving members through bearings; the second linear driving piece is arranged at the top end of the upright post, and the upright post is arranged on the frame body.
Preferably, in the above-mentioned adjustable full-size boat overturning tool, the first linear driving piece and the second linear driving piece are all electric hydraulic push rods, and the linear moving component is a piston rod of each electric hydraulic push rod.
Preferably, in the above-mentioned adjustable full-size boat overturning tool, the bottom of the frame body is provided with a universal wheel with a self-locking function, so that the universal wheel has a free movement function, and each conveyor belt unit can move freely on a flat ground.
Preferably, in the above-mentioned adjustable full-size boat overturning tool, the rotation driving mechanism is a servo motor.
Preferably, in the above-mentioned full-size ship upset frock of adjustable, still include control terminal and a plurality of motor controller, control terminal control is all motor controller, every motor controller control a pair of conveyer belt unit makes it possess synchronous operation function, because airship upset frock need constitute by a plurality of pairs of conveyer belt units, to make the capsule can overturn smoothly, need all conveyer belt units can synchronous operation, whole upset frock control system passes through unified control terminal control all motor controller, every motor controller control a pair of conveyer belt unit, a set of upset frock needs a plurality of pairs of conveyer belt units.
Compared with the prior art, the invention discloses an adjustable full-size boat overturning tool, which can be matched with the tool under different bag body shapes so as to avoid the phenomenon that the traditional conveying equipment conveying belt can locally gather due to the non-uniform diameter of a contact surface, so that the bag body can be overturned for a larger angle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an application of the present invention;
FIG. 2 is a perspective view of a conveyor belt unit;
FIG. 3 is a perspective view of another angle of the conveyor belt unit;
fig. 4 is a control schematic of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an adjustable full-size ship overturning tool which is used as ground guarantee equipment of a stratospheric airship, wherein the design standard of the tool takes the index of a test ship as input, and meanwhile, the tool is applicable in a larger range, a certain range limitation is made on the design index, and the adjustment range of the tool is formulated according to the index range.
The embodiment of the invention discloses an adjustable full-size boat overturning tool, which comprises a plurality of pairs of conveyor belt units 1, wherein each conveyor belt unit 1 comprises a frame 11, a first linear driving piece 12, a second linear driving piece 13, a conveyor belt 14, a first adjustable conveying roller 15, a second adjustable conveying roller 16, a tensioning roller 17, a driving roller 18, a tensioning roller sliding frame 19 and an upright post 110;
the first adjustable conveying roller 15 is rotatably arranged at one end of the frame 11 through the first linear driving piece 12, and the second adjustable conveying roller 16 is rotatably arranged at the other end of the frame 11 through the second linear driving piece 13 and the upright post 110; a tension roller 17 and a drive roller 18 are mounted below the second adjustable transport roller 16; the conveyor belt 14 is wound around a first adjustable transport roller 15, a second adjustable transport roller 16, a tension roller 17 and a drive roller 18; the rotating shafts at the two ends of the tensioning roller 17 are arranged in the sliding grooves of the tensioning roller sliding frame 19 in a sliding manner, and the tensioning roller sliding frame 19 is fixedly arranged on the frame body 11; the rotating shafts at two ends of the driving roller 18 are arranged on the frame 11 through bearings, and the rotating shaft at one end of the driving roller 18 is in transmission connection with the rotary driving mechanism.
According to the invention, the heights and angles of the first adjustable conveying roller 15 and the second adjustable conveying roller 16 can be adjusted through the first linear driving piece 12 and the second linear driving piece 13, so that the conveyor belt 14 can be matched with the radian of the bag body 2, the turnover tool is ensured to have a larger application range, and the turnover tool is suitable for different diameters.
In order to further optimize the above technical solution, the two ends of the first adjustable conveying roller 15 are respectively mounted on the linear moving parts of the two first linear driving members 12 through bearings, and the first linear driving members 12 are mounted on the frame 11.
In order to further optimize the technical solution described above, the two ends of the second adjustable transport roller 16 are respectively mounted on the linear moving elements of the two second linear drives 13 by means of bearings; the second linear driving member 13 is mounted on the top end of the column 110, and the column 110 is mounted on the frame 11.
In order to further optimize the technical solution, the first linear driving element 12 and the second linear driving element 13 are both electro-hydraulic push rods, and the linear moving element is a piston rod of the electro-hydraulic push rod.
In order to further optimize the above technical solution, the bottom of the frame 11 is provided with a universal wheel 111 with a self-locking function, so that it has a free movement function, and each conveyor belt unit 1 can move freely on a flat ground.
In order to further optimize the technical scheme, the rotary driving mechanism is a servo motor.
In order to further optimize the technical scheme, the airship overturning device further comprises a control terminal and a plurality of motor controllers, wherein the control terminal controls all the motor controllers, each motor controller controls a pair of conveyor belt units 1 to have a synchronous operation function, and as the airship overturning tool is composed of a plurality of pairs of conveyor belt units 1, the capsule body 2 can be overturned smoothly, all the conveyor belt units 1 can synchronously operate, the whole overturning tool control system controls all the motor controllers through a unified control terminal, each motor controller controls the servo motors of a pair of conveyor belt units 1, and a set of overturning tool needs a plurality of pairs of conveyor belt units 1.
Working principle:
step one: the bag body 2 can be turned over by calculating and determining that a plurality of pairs of conveyor belt units 1 are needed, equipment is fixed, and a line is connected;
step two: adjusting the height of each electro-hydraulic push rod to match each conveyor belt unit 1 with the bladder 2;
step three: the control terminal sends a signal to the motor controller, and the motor controller controls the conveyor belt unit 1 to synchronously rotate, so that the bag body 2 is driven to overturn.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention will not be limited to the embodiments shown herein,
but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The turnover tool for the adjustable full-size boat is characterized by comprising a plurality of pairs of conveyor belt units, wherein each conveyor belt unit comprises a frame body, a first linear driving piece, a second linear driving piece, a conveyor belt, a first adjustable conveying roller, a second adjustable conveying roller, a tensioning roller, a driving roller, a tensioning roller sliding frame and an upright post;
the first adjustable conveying roller is rotatably arranged at one end of the frame body through the first linear driving piece, two ends of the first adjustable conveying roller are respectively arranged on the linear moving parts of the two first linear driving pieces through bearings, and the first linear driving pieces are arranged on the frame body; the second adjustable conveying roller is rotatably arranged at the other end of the frame body through the second linear driving piece and the upright post; two ends of the second adjustable conveying roller are respectively arranged on the linear moving parts of the two second linear driving parts through bearings; the second linear driving piece is arranged at the top end of the upright post, and the upright post is arranged on the frame body; the tensioning roller and the driving roller are arranged below the second adjustable conveying roller; the conveyor belt is wound on the first adjustable conveying roller, the second adjustable conveying roller, the tensioning roller and the driving roller; the rotating shafts at two ends of the tensioning roller are arranged in the sliding grooves of the tensioning roller sliding frame in a sliding manner, and the tensioning roller sliding frame is fixedly arranged on the frame body; the rotating shafts at two ends of the driving roller are arranged on the frame body through bearings, and the rotating shaft at one end of the driving roller is in transmission connection with the rotary driving mechanism;
the first linear driving piece and the second linear driving piece can adjust the height and the angle of the first adjustable conveying roller and the second adjustable conveying roller, so that the radian of the conveyor belt is matched with that of the airship capsule body.
2. The adjustable full-scale boat turning tool of claim 1, wherein the first linear driving member and the second linear driving member are both electro-hydraulic pushrods, and the linear moving member is a piston rod of the electro-hydraulic pushrods.
3. The adjustable full-size boat overturning tool as claimed in claim 1, wherein universal wheels with self-locking functions are arranged at the bottom of the frame body.
4. The adjustable full-size boat turning tool of claim 1, wherein the rotary driving mechanism is a servo motor.
5. The adjustable full-scale boat turning tool of claim 4, further comprising a control terminal and a plurality of motor controllers, wherein the control terminal controls all of the motor controllers, each of the motor controllers controlling a pair of the conveyor units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110852134.6A CN113460637B (en) | 2021-07-27 | 2021-07-27 | Adjustable full-size ship upset frock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110852134.6A CN113460637B (en) | 2021-07-27 | 2021-07-27 | Adjustable full-size ship upset frock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113460637A CN113460637A (en) | 2021-10-01 |
| CN113460637B true CN113460637B (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110852134.6A Active CN113460637B (en) | 2021-07-27 | 2021-07-27 | Adjustable full-size ship upset frock |
Country Status (1)
| Country | Link |
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| CN (1) | CN113460637B (en) |
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| US5458227A (en) * | 1995-01-20 | 1995-10-17 | Digital Audio Disc Corporation | Product package inverting apparatus and method |
| CN210479843U (en) * | 2019-06-13 | 2020-05-08 | 南昌意达机械配件有限公司 | Angle-adjustable conveying roller way |
| CN212502679U (en) * | 2020-05-29 | 2021-02-09 | 洛阳天久科技有限公司 | Turning device is used in pan production |
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| JPH07237873A (en) * | 1994-02-25 | 1995-09-12 | East Japan Railway Co | Baggage carrying device |
| JP2014043312A (en) * | 2012-08-24 | 2014-03-13 | Nippon Conveyor Co Ltd | Sandwich conveyor |
| CN104118576A (en) * | 2014-08-07 | 2014-10-29 | 天津航天长征火箭制造有限公司 | Integrated large-angle rolling and posture adjusting rack car |
| CN205044939U (en) * | 2015-09-06 | 2016-02-24 | 东莞前沿技术研究院 | Aerostatics transmission drum -type restraint and release |
| CN205634827U (en) * | 2016-04-15 | 2016-10-12 | 天津市盛佳怡电子有限公司 | Turnover device of wind turbine blade |
| CN109279553A (en) * | 2018-11-02 | 2019-01-29 | 湖南航天远望科技有限公司 | A kind of aerostatics turnover device and method for turning |
| CN109573910A (en) * | 2018-12-28 | 2019-04-05 | 湖南航天远望科技有限公司 | A kind of huge aerostatics method for turning and device |
| CN210259887U (en) * | 2019-06-26 | 2020-04-07 | 儋州长润实业投资有限公司 | Glass conveying device |
| CN110405703B (en) * | 2019-07-08 | 2023-02-17 | 上海航天精密机械研究所 | Multifunctional trolley for aerospace product assembly |
| CN211282448U (en) * | 2019-11-25 | 2020-08-18 | 自贡金龙水泥有限公司 | Belt conveying device without carrier roller |
| CN111439530A (en) * | 2020-05-13 | 2020-07-24 | 武汉道森传动科技有限公司 | Chain type transmission rolling device |
| CN213169789U (en) * | 2020-08-31 | 2021-05-11 | 中国电子系统工程第四建设有限公司 | Rolling combination for large-diameter pipeline installation |
| CN213230362U (en) * | 2020-09-22 | 2021-05-18 | 汉中尧柏磊金节能环保建材有限公司 | Take cleaning device's grit conveyer belt |
| CN113146174A (en) * | 2021-03-29 | 2021-07-23 | 湖南航天远望科技有限公司 | Rotary supporting module assembly, aerostat assembly tool and using method thereof |
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2021
- 2021-07-27 CN CN202110852134.6A patent/CN113460637B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5458227A (en) * | 1995-01-20 | 1995-10-17 | Digital Audio Disc Corporation | Product package inverting apparatus and method |
| CN210479843U (en) * | 2019-06-13 | 2020-05-08 | 南昌意达机械配件有限公司 | Angle-adjustable conveying roller way |
| CN212502679U (en) * | 2020-05-29 | 2021-02-09 | 洛阳天久科技有限公司 | Turning device is used in pan production |
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| CN113460637A (en) | 2021-10-01 |
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