CN211254632U - Self-adaptive paper breaking mechanism of rewinding machine - Google Patents
Self-adaptive paper breaking mechanism of rewinding machine Download PDFInfo
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- CN211254632U CN211254632U CN201921658666.0U CN201921658666U CN211254632U CN 211254632 U CN211254632 U CN 211254632U CN 201921658666 U CN201921658666 U CN 201921658666U CN 211254632 U CN211254632 U CN 211254632U
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Abstract
The utility model discloses a rewinding machine self-adaptation paper breaking mechanism, include by the rewinding go up the roll, the rewinding lower roll and the rewinding roll three between the rewinding district that forms and with the rewinding go up the roll surface contact paper breaking mechanism who breaks, paper breaking mechanism disposes the first elastic element of balanced its dead weight and cooperatees with the frame that presets and is connected.
Description
Technical Field
The utility model relates to a production is taken toilet paper rewinding machine of refill, specifically indicates a self-adaptation paper breaking mechanism who is used for breaking the paper among the cored toilet paper rewinding machine.
Background
With the gradual application of automatic control technology in tissue post-processing machinery, toilet paper rewinding machines are gradually developed from semi-automatic individual rewinding equipment to full-automatic whole processing production lines. In the whole production line, the rewinding machine is an important device for determining the high and low production efficiency of the whole production line; in a series of action processes of edge knurling, punching, paper breaking, winding, rewinding and the like of the rewinding machine, paper breaking is a very critical action process, and whether the subsequent action, namely winding can be completed smoothly and rewinding quality is affected directly.
The currently disclosed method for realizing the paper breaking action of the rewinder mainly comprises three methods: the method comprises the following steps of electrically controlling differential paper breaking, mechanically breaking paper by a mechanism, and realizing mechanical and electrical integrated paper breaking based on mechanical and electrical control. The electric control differential speed paper breaking adjusts the speed difference among the upper rewinding roller, the lower rewinding roller and the rewinding pressing roller of the rewinder in an electric control mode, and further the speed difference is converted into the tension difference of paper webs to achieve paper breaking. The main defects of the paper breaking mode are that the requirements on the response speed and precision of electric control equipment components such as a motor and a frequency converter are high, the requirement on the parallelism among all roller bodies with large span is also high, and paper breaking positions are unstable and paper breaking heads are uneven due to factors such as response lag of mechanical equipment to instantaneous acceleration and deceleration, so that paper breaking and winding are failed.
The mechanical breaking is mainly to press and stretch the web in rewinding by means of the mechanical mechanism, or to directly cut the web, for example, patent publication nos. CN201338872Y, CN201415890Y, CN201419943Y and CN201415889Y disclose a swing plate type, a press roller type, a press block type and a blade rotation type breaking mechanism, respectively. Unlike the paper breaking method described in the above patent, a mechanical paper breaking mechanism disclosed in patent publication No. CN 203021084U: the paper core pressing type paper breaking mechanism is provided with a core tube damping mechanism at an inlet of a core tube channel, paper webs are pressed by the paper core waiting for rewinding to be tensioned and broken, additional mechanical parts do not need to be specially processed to press the paper webs, and the paper core pressing type paper breaking mechanism is simple in structure and high in efficiency. The fatal disadvantage of this structure is that it relies mainly on the paper core to compress the paper web, with strict requirements on the stiffness of the paper core, i.e. the structure is only suitable for hard cores and not for soft cores.
Fig. 1 shows an electromechanical paper breaking mechanism disclosed in publication nos. US5769352 and US5979818, that is, paper breaking is realized by electrical control on the basis of an independently designed paper breaking mechanism, and compared with the purely electrical control differential paper breaking or mechanical paper breaking, the electromechanical paper breaking mechanism integrates the stability of the mechanical paper breaking mechanism and the flexibility of the electrical control differential paper breaking. With reference to the attached drawing 1, when rewinding of the paper roll 7 is completed, the paper breaking mechanism 4 rotates at a speed lower than that of the rewinding upper roller 1, the pressure pad 5 stops instantaneously when rotating to the position of a connecting line of the rewinding upper roller 1 and a rotating shaft 11 of the pressure pad, the paper web 6 is pressed on the rewinding upper roller 1, the linear speed of the pressure pad 5 is smaller than that of the rewinding upper roller 1, a speed difference is generated between the pressure pad and the rewinding upper roller 1, and the speed is accelerated by matching with the rewinding pressing roller 3 to break the paper web; and a new paper core 9 is fed into a paper core channel formed by the guide plate 8, the upper rewinding roller 1 and the lower rewinding roller 2, and a new roll is rewound. Meanwhile, the paper cutting mechanism rapidly rotates to a certain position at the lower end of the guide plate 8 along the motion track P and stops for a short time, and then rotates upwards along the track P after the new paper roll is rewound, and continuously performs rotary motion with instantaneous pause and short stop, as shown by a serial number 10. The disadvantages of this design are: when the paper is cut, the pressure pad 5 at the top end of the pressing block is positioned at the connecting line O of the rewinding upper roller 1 and the pressure pad rotating shaft 111O3In addition, when the pressure pad 5 is worn, the pressure applied by the pressure pad 5 on the upper rewinding roller 1 becomes smaller or even zero, which may result in insufficient pressure and prevent the paper web from being smoothly broken, so that the press block needs to be mechanically adjusted periodically.
To overcome this drawback, patent publication CN102762471A discloses wear compensation of the pad without stopping and non-mechanical operation by phase shifting the paper cutter, as shown in fig. 2-4. In particular, as figure 2 shows, when the rewinding of the reel 7 is nearly completed, the severing assembly 4 rotates in the opposite direction to the advancing direction of the web 6. When the pressure pad 5 rotates to the upstream motion termination position, the pressure pad just presses the upper rewinding roller 1, at the moment, the lower rewinding roller 2 decelerates, the rewinding pressing roller 3 accelerates, and the speed difference between the three rollers generates a tension difference to overcome the tension of the paper web to break the paper, as shown in fig. 3. After the paper break is completed, the said breaking mechanism then rotates in reverse, i.e. accelerates in the same direction as the advance of the paper web and stays at the end of the movement below the guide plate 8, thus completing a cycle of reciprocating rotary motion 10 with stays at both extreme positions, as shown in fig. 4. In the mechanism, when the paper is cut, the pressure pad 5 is positioned at the connecting line O of the rewinding upper roller 1 and the rotating shaft 111O3Just right forward, when the pressure pad 5 is worn, it is only necessary to move closer to the center line O1O3The limiting stop position of the pressure pad 5 is adjusted in direction, and the pressure pad can be fully pressed on the rewinding upper roller 1 even if the movement track line P rotates backwards for a certain angle, so that the pressure required by paper breaking is obtained. However, the paper breaking mechanism adopts a plurality of paper breaking press blocks to act simultaneously to realize the tidiness of fractures, and still has the problems of mechanical vibration, noise and abrasion; the frequent starting and stopping and reversing movement of the paper breaking mechanism aggravate the vibration and abrasion of a mechanical structure, and the response speed of mechanical parts also limits the working speed of the rewinding machine; in addition, in actual work, due to installation errors of pressure pads at the top ends of the pressing blocks, the abrasion of the pressure pads is uneven, and the pressure exerted on the rewinding upper roller by the pressure pads is not balanced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a rewinding machine self-adaptation paper breaking mechanism.
In order to realize foretell purpose, the utility model provides a rewinding machine self-adaptation paper breaking mechanism, include by roll, the rewinding district that forms between rewinding lower roll and the rewinding compression roller three and with the rewinding roll surface contact the disconnected paper mechanism of disconnected paper, paper breaking mechanism disposes the first elastic element of balanced its dead weight and cooperatees with the frame of presetting and is connected.
Further, the paper breaking mechanism comprises a sliding block, a rotating shaft arranged on the sliding block and a plurality of rotating shafts fixed on the rotating shaftBreak-off Paper articleWhereinThe sliding block is matched and connected with the rack through a first elastic element, and the sliding block is provided with a driving mechanism for driving the sliding block to vertically reciprocate relative to the rack.
Furthermore, each paper breaking piece comprises a swing arm connected with the rotating shaft, a moving block connected to the end position of the swing arm in a sliding mode and a pressure pad fixedly arranged on the moving block, wherein a second elastic element is arranged between the moving block and the swing arm.
Furthermore, an accommodating cavity for accommodating a moving block is formed at the end part of the swing arm, and the moving block can reciprocate in the accommodating cavity along the length direction of the swing arm; and a second elastic element is arranged between the top surface and the bottom surface of the moving block and the upper inner wall and the lower inner wall of the containing cavity respectively, and the pressure pad is exposed and penetrates through the containing cavity to the outside of the end part of the swing arm.
Further, the contact surface of the pressure pad is composed of two sections of arc curved surfaces in smooth transition.
Further, each paper breaking piece is arranged side by side along the axial direction of the rotating shaft in sequence.
Further, each paper cutting piece is sequentially and spirally arranged along the axial direction of the rotating shaft within a rated central angle range.
Self-adaptation paper breaking mechanism, pressure pad adopt elastic connection device rather than fixed structure, need not shut down after pressure pad wearing and tearing, also need not dismouting machine parts, in allowable pressure range, paper breaking device can automatic adjustment pressure pad and rewinding pressure size between the roller realize disconnected paper, therefore is the paper breaking mechanism of lower maintenance cost and manufacturing cost.
Self-adaptation disconnected paper mechanism, wholly constitute by a plurality of above-mentioned elasticity disconnected paper subassembly, mutually independent each other does not influence between each disconnected paper subassembly. Under the condition that errors such as processing and installation cause that one pressure pad is seriously abraded compared with other pressure pads, paper breaking failure caused by insufficient local pressure of the pressure pad is avoided.
Self-adaptation disconnected paper mechanism, in another preferred embodiment, each disconnected paper subassembly adopts spiral fixed mode, each pressure pad uses its rotation axis as the benchmark along axial spiral distribution in certain central angle, factors such as the speed of a motor vehicle, stock form pitch and the cam structure that this central angle size depended on the rewinding machine. Therefore, when the paper is cut, the pressure pads do not act on the rewinding upper roller at the same time, but act on the rewinding upper roller in sequence, the line contact is changed into point contact, the line pressure is changed into point pressure, and the pulling force required for breaking the paper is reduced. The pressure of the whole paper cutting mechanism acting on the rewinding upper roller is reduced, and the friction force between the pressure pad and the roller body is reduced, so that the mechanical vibration, the noise and the abrasion can be obviously reduced.
Self-adaptation paper mechanism absolutely, adopt the servo motor drive to realize disconnected paper subassembly and wind its pivot continuous rotation to come control pressure pad and rewinding through another servo motor drive cam mechanism and go up the roller and whether contact. The pressure pad is contacted with the upper rewinding roller during the paper breaking action, and the pressure pad is separated from the upper rewinding roller after the paper breaking action is completed. In the whole working process of paper breaking, the pressure pad rotates around the rotating shaft all the time, and the servo motor does not need to be started or stopped, so that the performance of the electrical equipment is not damaged, and the mechanical parts are not fatigued and lose efficacy due to frequent starting and stopping.
Drawings
The contents of the drawings and the reference numerals in the drawings of the present specification will be briefly described below.
Fig. 1 is a schematic view of a rewinding machine provided with an independent paper cutting mechanism in the prior art.
Fig. 2-4 are schematic diagrams of a paper breaking process with a wear-compensating function in a rewinding machine of the prior art.
Fig. 5-7 are schematic diagrams of the paper cutting operation process of the adaptive paper cutting mechanism of the present invention.
Fig. 8 is a schematic view of the adaptive paper breaking assembly according to the present invention, i.e. a partial enlarged view at F.
Fig. 9 is a schematic layout view of a paper breaking assembly of the adaptive paper breaking mechanism according to the first embodiment of the present invention.
Fig. 10-11 are schematic layout views of a paper breaking assembly of an adaptive paper breaking mechanism according to a second embodiment of the present invention.
Fig. 12 is a schematic diagram illustrating the distribution of the positions of the pressure pads during a paper break according to the first embodiment of the present invention.
Fig. 13 is a schematic diagram illustrating the distribution of the positions of the pressure pads during a paper break according to the second embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete. It should be noted that the terms "first" and "second" in the present invention do not denote any particular quantity or order, but rather are used for distinguishing names.
Example one
With reference to fig. 4 to 7, a self-adaptive paper cutting mechanism of a rewinding machine comprises an upper rewinding roller 1, a lower rewinding roller 2, a rewinding pressing roller 3 and a paper cutting mechanism, wherein a rewinding area is formed among the upper rewinding roller 1, the lower rewinding roller 2 and the rewinding pressing roller 3, a paper web 6 is rewound on a paper core 9A in the rewinding area to form a paper roll 7, and as shown in fig. 4, the paper core 9B is in a stop position under the action of a pressing plate 12 and a support 13.
The paper breaking mechanism of the present embodiment includes a sliding block 16, a rotating shaft 11 disposed on the sliding block 16, and a plurality of paper breaking members 4 fixed on the rotating shaft 11, wherein the sliding block 16 is connected with a frame 18 through a first elastic element 17 in a matching manner (the first elastic element 17 of the present embodiment is a set of compression springs, that is, two ends of the compression spring are respectively connected with the bottom surface of the sliding block 16 and the frame 18), and the first elastic element 17 at this time is mainly used for overcoming the self weight of the paper breaking mechanism. The contact surface of the sliding block 16 and the frame 18 is plated with wear-resistant alloy or is a linear sliding rail to reduce the friction force between the sliding block 16 and the frame when the sliding block moves up and down. In addition, the sliding part 16 is provided with a driving mechanism for driving the sliding part to reciprocate vertically relative to the frame 18, wherein the driving mechanism of the embodiment comprises a rotating arm 19 and a cam 22 which are hinged on the frame 18 through a hinge 20, the slider 16 is connected with one end of the rotating arm 19, the other end of the rotating arm 19 is provided with a bearing 21 which is in interference fit with the cam 22, the other end of the rotating arm 19 is also provided with a cylinder 23, the rotating action of the cam 22 is combined with the telescopic action of the cylinder 23 to control the slider 16 to move up and down through the rotating arm 19, and the contact and separation actions of the paper breaking part 4 and the upper rewinding roller 1 are indirectly controlled, namely, when the far rest end of the cam 22 is positioned below, the slider 16 moves up, the paper breaking part 4 is in contact; when the near resting end of the cam 22 is below, the slider 16 moves downwards, and the paper cutting member 4 is separated from the upper rewinding roller 1.
In the present embodiment, each paper cutter 4 includes a swing arm 26, a moving block 27 slidably connected to an end position of the swing arm 26, and a pressure pad 30 fixedly provided on the moving block 27, and the swing arm 26 is fixed on the rotating shaft 11 and rotates with the rotating shaft 11; an accommodating cavity for accommodating a moving block 27 is formed at the end part of the swing arm 26, and the moving block 27 can reciprocate in the accommodating cavity along the length extending direction of the swing arm 26; second elastic elements (28, 29) are arranged between the top surface and the bottom surface of the moving block 27 and the upper inner wall and the lower inner wall of the accommodating cavity respectively, namely, the second elastic elements (28, 29) are springs, two ends of each spring 28 are connected with the top surface of the moving block 27 and the upper inner wall of the accommodating cavity respectively, and two ends of each spring 29 are connected with the bottom surface of the moving block 27 and the lower inner wall of the accommodating cavity respectively; the moving block 27 is elastically cushioned by second elastic members 28, 29 to move up and down in the accommodating chamber. The contact surface of the moving block 27 and the swing arm 26 is plated with a wear-resistant alloy material to enhance the wear resistance, and a linear slide rail structure can be adopted to reduce the friction. The pressure pad 30 of this embodiment is made of a wear-resistant elastic material and is glued to the top surface of the moving block 27, and the pressure pad 30 is exposed to penetrate through the top surface of the containing cavity to the outside of the end portion of the swing arm 26, as shown in fig. 8, the contact surface of the pressure pad 30 is composed of two arc curved surfaces in smooth transition, and is used for increasing the contact area with the upper rewinding roller 1 and reducing the pressure applied to the upper rewinding roller 1 during paper breaking.
The spring 28 and the spring 29 are reasonably designed, acting forces of the spring 28 and the spring 29 and centrifugal force of the pressure pad 5 during high-speed rotation are balanced, so that the pressure pad 5 can still effectively press the rewinding upper roller 1 after being abraded, pressure exerted on the rewinding upper roller by the pressure pad 5 is enough to break paper, the pressure pad 5 can be fixed by adopting the second elastic elements on the upper side and the lower side of the moving block 27, the pressure pad 5 can move up and down, after the surface of the pressure pad is abraded, the lower elastic elements push the pressure pad to move up to effectively contact the rewinding upper roller 1 to realize paper breaking, the pressure pad 5 does not need to be stopped before complete failure, the production efficiency is higher, in addition, the automation of the paper breaking mechanism is balanced through the first elastic elements, the cam and the roller bearing contact surface of the cam bear smaller acting force, and the control precision and the stability of the cam mechanism can be.
Further, a weight member is provided at each of the paper breaking members 4, that is, a weight member is provided at a position opposite to a joint of the swing arm 26 and the rotary shaft 11, and serves as a counter weight for balancing the rotational motion of the swing arm 26.
When the paper roll 7 reaches the set roll diameter after rewinding, the paper core 9B is brought into the rewinding channel P2 formed by the arc-shaped plate 8 and the rewinding upper roller 1 under the action of the shifting plate 14, meanwhile, the pressure pad 5 starts to contact with the rewinding upper roller 1 under the action of the cam 22 to finish the paper breaking action, a new paper head 24 generated when the paper web 6 is broken is wound on the paper core 9B to start a new rewinding process, and a new paper tail 25 is adhered to the paper roll 7 through a tail sealing device, as shown in FIG. 6. After the paper cutting is finished, the long-distance resting process of the cam is finished, the long-distance resting end rotates upwards to the highest position to enter the short-distance resting process, the sliding block 16 moves downwards, and the pressure pad 5 is separated from the rewinding upper roller 1, as shown in fig. 7.
In the paper breaking process, the paper breaking piece 4 rotates around the rotating shaft 11 in a single direction all the time (the rotating shaft 11 is driven by a servo motor, not shown in the figure), and the operation of starting and stopping the machine is not needed in the whole paper breaking circulation process.
As shown in fig. 12, in the present embodiment, the paper breaking units 4 are sequentially arranged side by side along the axial direction of the rotating shaft 11 in a straight line, wherein, during paper breaking, the pressure pads 5 of the paper breaking units 4 simultaneously contact the upper rewinding roller 1, so that the paper web is simultaneously broken along the perforation line P3, and the tension applied to the next section of paper web at the breaking instant is the resultant of the tension generated by the pressure pads 5 when the paper web is broken.
Example two
Referring to fig. 10 and 11, the difference compared with the first embodiment is characterized in that: the paper cutting assemblies 4 of the second embodiment are sequentially and spirally arranged along the axial direction of the rotating shaft 11 within a rated central angle range, and as can be seen from the attached drawing 11, the paper cutting assemblies 4 of the second embodiment are circumferentially distributed within a central angle range beta in a plane perpendicular to the axis of the rotating shaft, and the size of the central angle range beta depends on the factors of the speed, the roll pitch, the rotating speed of the rotating shaft, the cam structure and the like of the rewinding machine.
For convenience of explanation, the paper cutting mechanism composed of N paper cutting members 4 is defined herein that the 4 th-1 st group of pressure pads 5 contact the upper rewinding roller 1 first, then the 4 th-2 nd group of pressure pads 5, and so on, and finally the 4 th-N th group of pressure pads 5 contact the upper rewinding roller 1.
During paper breaking, the pressure pads 5 of the paper breaking members 4 are sequentially contacted with the upper rewinding roller 1, and are released simultaneously, which is different from the first embodiment, so that the pressure applied on the upper rewinding roller 1 by each pressure pad 5 is decomposed into smaller single pressure, the tension in the paper web is the tension generated when a single presser foot breaks the paper, and the paper web breaks along the perforation line P3 gradually.
The spiral paper cutting mode in the second embodiment is beneficial to reducing the influence of input disturbance on roller surface jumping and the like caused by high-speed rotation of the upper rewinding roller, and can ensure that the upper rewinding roller stably works at a high speed.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. The utility model provides a rewinding machine self-adaptation paper breaking mechanism, includes by the rewinding district that forms between roller (1), rewinding lower roll (2) and rewinding compression roller (3) three and with the rewinding roller (1) roll surface contact paper breaking mechanism of disconnected paper, its characterized in that: the paper breaking mechanism is provided with a first elastic element (17) for balancing the self weight of the paper breaking mechanism and is matched and connected with a preset rack (18).
2. The self-adaptive paper breaking mechanism of the rewinding machine as claimed in claim 1, characterized in that: the paper breaking mechanism comprises a sliding block (16), a rotating shaft (11) arranged on the sliding block (16) and a plurality of paper breaking pieces (4) fixed on the rotating shaft (11), wherein the sliding block (16) is connected with a rack (18) in a matched mode through a first elastic element (17), and the sliding block (16) is provided with a driving mechanism for driving the sliding block to vertically reciprocate relative to the rack (18).
3. The self-adaptive paper breaking mechanism of the rewinding machine as claimed in claim 1, characterized in that: each paper breaking piece (4) comprises a swing arm (26) connected with the rotating shaft (11), a moving block (27) connected to the end position of the swing arm (26) in a sliding mode, and a pressure pad (30) fixedly arranged on the moving block (27), wherein second elastic elements (28 and 29) are arranged between the moving block (27) and the swing arm (26).
4. The self-adaptive paper breaking mechanism of the rewinding machine as claimed in claim 3, wherein: an accommodating cavity for accommodating a moving block (27) is formed in the end part of the swing arm (26), and the moving block (27) can reciprocate in the accommodating cavity along the length direction of the swing arm (26); second elastic elements (28, 29) are arranged between the top surface and the bottom surface of the moving block (27) and the upper inner wall and the lower inner wall of the containing cavity respectively, and the pressure pad (30) is exposed and penetrates through the containing cavity to the outside of the end part of the swing arm (26).
5. The self-adaptive paper breaking mechanism of the rewinding machine as claimed in claim 3, wherein: the contact surface of the pressure pad (30) is composed of two sections of arc curved surfaces in smooth transition.
6. The self-adaptive paper breaking mechanism of the rewinding machine as claimed in claim 3, wherein: the paper breaking pieces (4) are sequentially arranged side by side along the axial direction of the rotating shaft (11).
7. The self-adaptive paper breaking mechanism of the rewinding machine as claimed in claim 3, wherein: the paper breaking pieces (4) are sequentially and spirally arranged along the axial direction of the rotating shaft (11) in a rated central angle range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921658666.0U CN211254632U (en) | 2019-09-30 | 2019-09-30 | Self-adaptive paper breaking mechanism of rewinding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921658666.0U CN211254632U (en) | 2019-09-30 | 2019-09-30 | Self-adaptive paper breaking mechanism of rewinding machine |
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| CN211254632U true CN211254632U (en) | 2020-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921658666.0U Expired - Fee Related CN211254632U (en) | 2019-09-30 | 2019-09-30 | Self-adaptive paper breaking mechanism of rewinding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114261811A (en) * | 2021-12-02 | 2022-04-01 | 广东工贸职业技术学院 | Rewinding machine |
-
2019
- 2019-09-30 CN CN201921658666.0U patent/CN211254632U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114261811A (en) * | 2021-12-02 | 2022-04-01 | 广东工贸职业技术学院 | Rewinding machine |
| CN114261811B (en) * | 2021-12-02 | 2023-11-10 | 广东工贸职业技术学院 | Rewinding machine |
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