CN110980388A - Method for cutting sheet-shaped object - Google Patents
Method for cutting sheet-shaped object Download PDFInfo
- Publication number
- CN110980388A CN110980388A CN201910332500.8A CN201910332500A CN110980388A CN 110980388 A CN110980388 A CN 110980388A CN 201910332500 A CN201910332500 A CN 201910332500A CN 110980388 A CN110980388 A CN 110980388A
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- Prior art keywords
- sheet
- roll
- cutting
- knife
- control system
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
- B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
- B65H35/08—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators from or with revolving, e.g. cylinder, cutters or perforators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/22—Distance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/19—Specific article or web
- B65H2701/1924—Napkins or tissues, e.g. dressings, toweling, serviettes, kitchen paper and compresses
Landscapes
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention discloses a method for cutting off a sheet, which is characterized in that the sheet is fed between a knife roller and an anvil roller and the knife roller rotates at the same time, and the rotating process of the knife roller comprises a cutting-off process, a detection process, a comparison process and an adjustment process; in the cutting process, the knife roll and the anvil roll rotate relatively to cut the sheet-shaped object, and the sheet-shaped object can generate a reaction force to the knife roll in the cutting process; in the detection process, the pressure sensor senses the magnitude of the cutting force and transmits the sensed numerical value to the control system; in the comparison process, the control system compares the received numerical value with a set value and sends out different responses according to the comparison result; and in the adjusting process, the position of the cutter roller is adjusted in real time according to the response sent by the control system. The invention detects the cutting force of the knife roll for cutting the sheet-shaped object through the pressure sensor, feeds the force back to the control system, and the control system compares and analyzes the force and adjusts the gap between the knife roll and the anvil roll through the servo motor, so that the cutting quality of the sheet-shaped object is kept consistent.
Description
Technical Field
The invention relates to the field of manufacturing of disposable sanitary products, in particular to a method for cutting off a sheet-shaped object.
Background
As one of the methods of forming the through-holes in the sheet-like material, a method called punching using a cutter roll, for example, chinese patent application No. CN201521053947.5 discloses a model cutter device for an absorbent article, in which a model cutter roll cuts the sheet-like material between anvil rolls.
However, when the knife roll is used for cutting the sheet-shaped object, the traditional method of adjusting the gap between the knife roll and the anvil roll by the air cylinder is difficult to meet the requirement of high-precision adjustment because the sheet-shaped object requires different cutting gaps at different speeds to ensure the cutting effect; the mode of adjusting the gap between the knife roll and the anvil roll by the servo motor can realize micro-adjustment, but because the adjusting process is open-loop control, the gap cannot be adjusted in real time according to the cutting effect, and the problems of short service life of the cutter and high equipment outage rate can be caused.
Disclosure of Invention
In view of the above, the present invention is directed to provide a method for cutting a sheet, which solves the problem of the prior art that the gap between the knife roll and the anvil roll cannot be accurately controlled on-line in real time.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for cutting a sheet material includes feeding the sheet material between a cutter roll and an anvil roll while rotating the cutter roll, and the cutter roll rotating process includes a cutting step, a detecting step, a comparing step and an adjusting step. In the cutting process, the knife roll and the anvil roll rotate relatively to cut the sheet-shaped object, the knife roll cuts the sheet-shaped object in the cutting process, and the sheet-shaped object can generate a reaction force to the knife roll; in the detection process, the pressure sensor senses the magnitude of the cutting force and transmits the sensed numerical value to the control system; in the comparison process, the control system compares the received numerical value with a set value and sends out different responses according to the comparison result; and in the adjusting process, the position of the cutter roller is adjusted in real time according to the response sent by the control system. The invention detects the cutting force of the knife roll for cutting the sheet-shaped object through the pressure sensor and feeds the force back to the control system, the control system carries out comparison and analysis, and the gap between the knife roll and the anvil roll is adjusted through the servo motor, so that the cutting quality of the sheet-shaped object is kept consistent.
The pressure sensor is arranged between two connecting elements, wherein one connecting element is arranged on a lower toggle rod of the gap fine-adjustment connecting rod mechanism, the other connecting element is connected with a moving plate for fixing the knife roller, the knife roller can apply cutting force to the sheet when in work, and the corresponding sheet applies reaction force with the same magnitude as the cutting force to the knife roller. In addition, the pressure sensor is preferably installed in a pre-pressing mode, and the pressure sensor can measure force even if no cutting force exists, so that the cutting force of the knife roller on the sheet-shaped object can be detected when the cutting force is small. In addition, in order to eliminate the clearance of the clearance fine adjustment connecting rod mechanism, an elastic element is further installed below the flange of the fixed knife roll, so that the problems of damage to the knife blade and unstable product quality caused by the change of the outer diameter of the knife roll due to different temperatures can be solved. The pressure is an important parameter for cutting and forming, the product quality can be improved by controlling the pressure, and the service life of the knife roller is prolonged. The above elastic element may be a spring, a pressure spring or other similar means.
Further, in the adjusting process, when the sensed value is within the tolerance range of the set value, the knife roller is not adjusted. And when the sensed value exceeds the tolerance range of the set value, the knife roll moves upwards or downwards to adjust the gap between the knife roll and the anvil roll in real time. Specifically, when the sensed numerical value is larger than the set value, the knife roller is lifted for a certain displacement, the lifted displacement is different according to the difference with the set value, the difference is large, the lifted displacement is large, the difference is small, and the lifted displacement is small. When the sensed numerical value is smaller than the set value, the knife roller is pressed down for a certain displacement, the pressing displacement is different according to the difference with the set value, the difference is large, the pressing displacement is large, the difference is small, and the pressing displacement is small. The force circulation mode when the knife roller cuts the sheet-shaped object is as follows: cutting-off-detection-comparison-adjustment.
To achieve the above object, a method for cutting a sheet material using a cutting device, the cutting device comprising: the device comprises an anvil roll, a knife roll arranged at the external connection position of the anvil roll, a knife edge arranged on the knife roll and used for cutting and forming a sheet-shaped object according to a specified shape, a moving plate for fixing the knife roll, a sensing component used for sensing the cutting force of the knife roll, a control system for receiving the numerical value of the cutting force and comparing the numerical value with a set value, and a gap fine-tuning connecting rod mechanism. This clearance fine setting link mechanism includes: the upper toggle rod, the lower toggle rod, the telescopic rod, the linear guide rail pair and the eccentric shaft are arranged on the upper bracket; the eccentric shaft is arranged at the upper end of the upper toggle rod and used for adjusting a gap between the knife roller and the anvil roller during initial setting, the lower end of the upper toggle rod is hinged with the upper end of the lower toggle rod to form a hinge point, one end of the telescopic rod acts on the hinge point, and the other end of the telescopic rod is connected with the servo motor. The lower end of the lower toggle rod is connected with the sensing component, and the linear guide rail pair is used for ensuring that the moving plate can only move upwards along the vertical direction.
When the length of the telescopic rod is changed, the motion plate is driven to move in the direction limited by the linear guide rail pair through the upper toggle rod and the lower toggle rod. When the upper toggle rod and the lower toggle rod are close to the same line, the knife roller fixed by the moving plate is in a working position, the knife roller and the anvil roller are interacted at the moment, the sensing part is subjected to upward reaction force and is transmitted to a revolute pair where the eccentric shaft is located through the lower toggle rod and the upper toggle rod, and the influence on the telescopic rod is small.
Meanwhile, when the knife roll is in the working position, the clearance between the knife roll and the anvil roll changes slowly when the telescopic rod changes the unit length, and the clearance is finely adjusted. When the knife roll is in a non-working position, the clearance between the knife roll and the anvil roll changes faster when the telescopic rod changes unit length, so that the working efficiency is improved, and the knife roll can be quickly lifted to return to a safety position more conveniently in case of emergency. The above telescopic rod can be a ball screw, a linear bearing or other similar modes.
The circumscribed position in the present invention means that the knife roll and the anvil roll are close to or even in contact with each other to such an extent that the knife roll and the anvil roll are parallel to each other and the sheet is formed between the blade of the knife roll and the anvil roll. By sheet is meant one of single-layer and multi-layer finished or semi-finished products of sanitary articles or similar consumables. The term "pressure sensor-induced breaking force" is understood to mean both a relative force or a resultant force, and an absolute or single force. The former is to ensure that the pressure sensor can accurately and sensitively sense the acting force, the pressure sensor adopts pre-pressing installation, so the force applied by the pressure sensor comprises pre-pressing force and acting force generated by the elastic element due to deformation in addition to the reaction force equal to the cutting force, but in the invention, in order to more intuitively read the cutting force of the knife roll, the latter is considered preferentially, namely, the pre-pressing force and the acting force generated by the elastic element due to deformation are cleared through a control system, and then only the reaction force of the sheet on the knife roll is reserved.
The sensing member includes a pressure sensor, an upper connecting member, and a lower connecting member. The pressure sensor is disposed between an upper link member mounted on the lower toggle link and a lower link member connected with a moving plate for fixing the cutter roller. The lower connecting element is provided with a mounting groove, the pressure sensor is arranged in the mounting groove, and the upper connecting element is arranged above the pressure sensor and is connected with the lower connecting element through a bolt. In addition, the control system comprises a servo motor, and the output end of the servo motor is connected with the telescopic rod.
Furthermore, a proximity sensor is mounted on the telescopic rod and used for calibrating the zero position of the cutting device.
Before the cutting process is started, the method further comprises a step of setting a knife roll initial position and adjusting the gap between the knife roll and the anvil roll to be a working gap. The steps for setting the initial position of the knife roller are as follows: the device returns to the zero point position, the servo motor rotates by a set angle by taking the zero point position as a reference point, the knife roll approaches to the working position, and the eccentric shaft is adjusted according to the size of the gap so that the gap is a working gap. And setting the adjusted position as a working position, and calibrating the position of the motor encoder.
In addition to the above steps, the present invention further includes a step of detecting the sheet stub between the knife roll and the anvil roll. When the system detects that the sheet material joint signal exists and the joint passes through the device, the system stops the force circulation mode and the knife roller is lifted to a safe position; when the joint passes through the device, the knife roller automatically returns to the working position.
The invention has the beneficial effects that: the invention detects the cutting force of the knife roll for cutting off the sheet-shaped objects through the pressure sensor and feeds the force back to the control system, the control system carries out comparison and analysis, and the gap between the knife roll and the anvil roll is adjusted through the servo motor, thereby ensuring the cutting effect at different cutting speeds. In addition, the gap between the knife roll and the anvil roll can be accurately adjusted through the gap fine adjustment link mechanism, and meanwhile, the knife roll can quickly return to a safety position when an emergency situation occurs, so that the safety and the continuity of the whole cutting process are improved.
Drawings
FIG. 1 is a schematic view of the cutting apparatus of the present invention.
Fig. 2 is a J-direction view of the sensor part in the cutoff device.
Fig. 3 is a perspective view of the sensor part.
Fig. 4 is a schematic diagram of a lash trimming linkage.
FIG. 5 is a schematic view of the knife roll in cooperation with the anvil roll.
Fig. 6 is a flowchart of setting the initial position of the knife roll.
Fig. 7 is a flow chart of the present invention.
Detailed Description
The present invention will be described below with reference to the drawings of embodiments of the present invention.
In the embodiment of the method, the first step,
a method for cutting a sheet material by rotating a knife roll 2 while feeding the sheet material between the knife roll 2 and an anvil roll 1, the method comprising the steps of:
s1, cutting step: in the cutting process, the knife roll 2 and the anvil roll 1 rotate relatively to cut the sheet, and the sheet generates a reaction force F to the knife roll in the cutting process.
S2, detection step: in the detection process, the pressure sensor senses the magnitude of the cutting force and transmits the sensed value to the control system. In this case, the pressure sensor 15 is arranged between two connecting elements 16, 17, one of which is arranged on the lower toggle lever of the gap fine-adjustment linkage and the other of which is connected to a moving plate for fixing the knife roller, which in operation exerts a cutting force on the sheet, the corresponding sheet exerting a reaction force on the knife roller which is equal in magnitude to the cutting force. The pressure sensor is installed in a prepressing mode.
S3, comparison step: in the comparison process, the control system compares the received numerical value with a set value and sends out different responses according to the comparison result.
S4, an adjusting procedure: and in the adjusting process, the position of the cutter roller is adjusted in real time according to the response sent by the control system.
When the sensed value is within the tolerance of the set value, the knife roll is not adjusted.
When the sensed numerical value is larger than the set value, the knife roller is lifted for certain displacement, the lifted displacement is different according to the difference with the set value, the difference is large, the lifted displacement is large, the difference is small, and the lifted displacement is small.
When the sensed numerical value is smaller than the set value, the knife roller is pressed down for a certain displacement, the pressing displacement is different according to the difference with the set value, the difference is large, the pressing displacement is large, the difference is small, and the pressing displacement is small.
The cutting device used in the present invention will be described in detail below.
As shown in fig. 1 to 5, the cutting device 100 includes: the device comprises an anvil roller 1, a knife roller 2 arranged at the external position of the anvil roller 1, a knife edge 13 arranged on the knife roller 2 and used for cutting and forming a sheet-shaped object according to a specified shape, a moving plate 4 for fixing the knife roller, a flange 11 which can slide up and down in the grooves of a left frame 3 and a right frame 10 and used for fixing the knife roller, a sensing component used for sensing the cutting force of the knife roller, a control system for receiving the cutting force value and comparing the value with a set value, and a gap fine adjustment connecting rod mechanism.
Wherein, clearance fine setting link mechanism includes: an upper toggle rod 6, a lower toggle rod 5, a ball screw 8, a linear guide rail pair 14 and an eccentric shaft 7. Wherein the lower end of the upper toggle rod 6 is hinged with the upper end of the lower toggle rod 5 to form a hinge point A, one end of the ball screw 8 acts on the hinge point A, and the other end is connected with the servo motor 9. The lower end of the lower toggle lever 5 is connected to the sensing member, and the linear guide pair 14 is used to ensure that the moving plate 4 can only move in the vertical direction. a. b and c are fixed rotating pairs, and A, B is a rotating pair.
An eccentric shaft 7 is provided at the upper end of the upper toggle link 6 to adjust a preset gap when the gap between the knife roll and the anvil roll is initially set. When the gap between the knife roll and the anvil roll is initially set, the gap can be adjusted by means of the eccentric shaft if the gap trimming linkage is already in the extreme position after the upper toggle link 6 and the lower toggle link 5 are collinear, at which time the gap between the knife roll and the anvil roll does not reach the desired value. The gap is adjusted by the eccentric shaft, and the gap adjusting function of the gap fine adjusting mechanism is not influenced.
When the length of the ball screw 8 is changed, the moving plate 4 is driven to move in the direction restricted by the linear guide pair 14 by the upper toggle link 6 and the lower toggle link 5. When the upper toggle rod and the lower toggle rod are close to the same line, the knife roller fixed by the moving plate is in the working position, the knife roller and the anvil roller are interacted at the moment, the sensing part is subjected to upward reaction force and is transmitted to a rotating pair where the eccentric shaft is located through the lower toggle rod and the upper toggle rod, the influence on the ball screw is small, and the servo motor and the ball screw are effectively protected. When the upper toggle rod and the lower toggle rod are collinear, the ball screw is the longest as the dead point position of the mechanism.
Meanwhile, when the knife roll is in the working position, the clearance between the knife roll and the anvil roll changes slowly every time the ball screw changes the unit length, and the clearance is finely adjusted. When the knife roll is in a non-working position, the clearance between the knife roll and the anvil roll changes rapidly when the unit length of the ball screw changes, so that the work efficiency is improved, and the knife roll can be lifted rapidly to return to a safety position rapidly in case of emergency.
Because the clearance between the knife roller 2 and the anvil roller 1 is small, small changes can affect the cutting effect, in order to eliminate the influence of the clearance fine-tuning link mechanism on cutting, a spring 12 is arranged under a flange for fixing the knife roller, when the knife roller is in a working position, the flange is subjected to spring force, and the clearance between the links is eliminated through the reaction force of the spring 12 so as to counteract the clearance between the revolute pairs of the clearance fine-tuning link mechanism.
The sensing part includes: a pressure sensor 15, an upper connecting element 16, and a lower connecting element 17. The pressure sensor 15 is arranged between an upper connecting element 16 and a lower connecting element 17, the upper connecting element 16 being mounted on the lower toggle link 5 of the gap fine-adjustment linkage, the lower connecting element 17 being connected with the moving plate 4 for fixing the knife roll. A mounting groove 18 is formed on the lower connection member 17, the pressure sensor 15 is seated in the mounting groove 18, and the upper connection member 16 is disposed above the pressure sensor 15 and connected to the lower connection member 17 by a bolt.
The control system comprises a servo motor 9, and the output end of the servo motor 9 is connected with a ball screw 8. The servomotor 9 can make precise adjustments to the gap between the knife roll and the anvil roll by means of a gap-fine adjustment linkage.
A proximity sensor 19 is mounted on the ball screw for calibrating the zero position of the cut-off device.
As shown in fig. 6, the flow of setting the initial position of the knife roll in the present invention is as follows: the device returns to the zero point position, the servo motor rotates by a set angle by taking the zero point position as a reference point, the knife roll approaches to the working position, and the eccentric shaft is adjusted according to the size of the gap so that the gap is a working gap. And setting the adjusted position as a working position, and calibrating the position of the motor encoder.
As shown in fig. 7, the working flow of the present invention is as follows: when the initial position setting is finished, a signal is given to the cutting device, the device moves from the zero position to the calibrated working position, the knife roller starts to work, when the knife roller cuts off the sheet-shaped object, the pressure sensor can detect the cutting force, the control system compares the measured force value with the set standard cutting force, and when the sensed value is within the tolerance range of the set value, the knife roller is not adjusted. When the sensed numerical value is larger than the set value, the knife roller is lifted for certain displacement, the lifted displacement is different according to the difference with the set value, the difference is large, the lifted displacement is large, the difference is small, and the lifted displacement is small. When the sensed numerical value is smaller than the set value, the knife roller is pressed down for a certain displacement, the pressing displacement is different according to the difference with the set value, the difference is large, the pressing displacement is large, the difference is small, and the pressing displacement is small. The force circulation mode when the knife roller cuts the sheet-shaped object is as follows: cutting-off-detection-comparison-adjustment. When the system detects that the sheet material joint signal exists and the joint passes through the device, the system stops the force circulation mode and the knife roller is lifted to a safe position; when the joint passes through the device, the knife roller automatically returns to the working position.
The above description and drawings are only for the purpose of illustrating preferred embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and it will be apparent to those skilled in the art that the technical solutions and inventive concepts according to the present invention disclosed herein may be equally replaced or modified within the technical scope of the present invention.
Claims (9)
1. A method for cutting a sheet material, wherein a cutter roll is rotated while feeding the sheet material between the cutter roll and an anvil roll, characterized in that: the rotating process of the knife roll comprises a cutting process, a detection process, a comparison process and an adjustment process;
in the cutting process, the knife roll and the anvil roll rotate relatively to cut the sheet-shaped object, and the sheet-shaped object generates a reaction force to the knife roll in the cutting process;
in the detection process, the pressure sensor senses the magnitude of the cutting force and transmits the sensed numerical value to the control system;
in the comparison process, the control system compares the received numerical value with a set value and sends out different responses according to the comparison result;
and in the adjusting procedure, the position of the cutter roller is adjusted in real time according to the response sent by the control system.
2. The sheet cutting method according to claim 1, wherein: the pressure sensor is mounted between two connecting elements, one of which is mounted on the lower toggle link of the gap fine-tuning linkage mechanism and the other of which is connected to a moving plate for fixing the knife roll.
3. The sheet cutting method according to claim 1, wherein: the pressure sensor is installed in a prepressing mode.
4. The sheet cutting method according to claim 1, wherein: in the adjusting process, when the sensed value is within the tolerance range of the set value, the knife roller is not adjusted.
5. The sheet cutting method according to claim 1, wherein: in the adjusting process, when the sensed value is out of the tolerance range of the set value, the knife roller is lifted or pressed downwards.
6. The sheet cutting method according to claim 1, wherein: in the adjusting process, the control system adjusts the gap between the knife roll and the anvil roll by using the gap fine adjustment link mechanism.
7. The sheet cutting method according to claim 1, wherein: before the cutting process is started, the method further comprises a step of setting a knife roll initial position and adjusting the gap between the knife roll and the anvil roll to be a working gap.
8. The sheet cutting method according to claim 1, wherein: the method further includes a step of detecting the sheet stub between the knife roll and the anvil roll.
9. The sheet cutting method according to any one of claims 1 to 8, wherein: the sheet is one of a single-layer and a multi-layer finished or semi-finished product of a sanitary article or similar consumable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910332500.8A CN110980388B (en) | 2019-04-24 | 2019-04-24 | Method for cutting sheet-shaped object |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910332500.8A CN110980388B (en) | 2019-04-24 | 2019-04-24 | Method for cutting sheet-shaped object |
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| CN110980388A true CN110980388A (en) | 2020-04-10 |
| CN110980388B CN110980388B (en) | 2022-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112850260A (en) * | 2021-01-04 | 2021-05-28 | 深圳名彩智能卡有限公司 | Labeler for producing RFID (radio frequency identification) labels |
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| JPS5964320A (en) * | 1982-10-06 | 1984-04-12 | Agency Of Ind Science & Technol | Automatic cutting machine for frp tape |
| JP3725798B2 (en) * | 2001-03-30 | 2005-12-14 | 允 鈴木 | Cutting roller device |
| DE102007062936A1 (en) * | 2007-12-28 | 2009-07-02 | Bikoma Ag Spezialmaschinen | Product e.g. diaper, rotationally cutting device, has cutting roller lying over bearer rings that include conical or frustum-shaped outer contour, and axial-controlling element for axial adjustment of cutting roller and/or impression roller |
| CN105729998A (en) * | 2016-04-19 | 2016-07-06 | 唐山瑞可达科技有限公司 | Moving platform adjusting device for flat-pressing flat-hot-stamping die-cutting machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112850260A (en) * | 2021-01-04 | 2021-05-28 | 深圳名彩智能卡有限公司 | Labeler for producing RFID (radio frequency identification) labels |
| CN112850260B (en) * | 2021-01-04 | 2022-07-29 | 深圳名彩智能卡有限公司 | Labeler for producing RFID (radio frequency identification) labels |
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| CN110980388B (en) | 2022-02-18 |
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