Label rejection device and labeling machine using the same

Abstract

The application discloses a label removing device and a labeling machine, and relates to the technical field of labeling machines, and particularly relates to a label removing device and a labeling machine. The label removing device comprises a label removing conveying mechanism, and the structure of the label removing conveying mechanism comprises: a punching conveying belt arranged around a roller assembly; the roller assembly comprises a label sucking roller, a label blowing roller and a power tensioning roller; a label sucking through hole on the label sucking roller and a label blowing through hole on the label blowing roller are respectively communicated with the holes on the punching conveying belt outside the label sucking roller and the label blowing roller; the label sucking roller and the label blowing roller are respectively arranged at a label sucking end and a label collecting end; the punching conveying belt rotates in a conveying area and a recovery area; the inner side of the punching conveying belt in the conveying area is provided with a negative pressure distribution assembly which is communicated with a negative pressure generating device; the negative pressure distribution assembly is communicated with the holes on the punching conveying belt outside the negative pressure distribution assembly; the label collecting end is provided with a label collecting assembly; and the label sucking roller is provided with a label removing mechanism which can make the label at the label removing position separate from the label sucking roller. The label removing device has the advantages of simple and ingenious structure, reliable removal of the missed label, and orderly collection.

Description

Technical Field

[0001] This invention relates to the field of labeling equipment technology in liquid filling production lines, specifically to labeling machines. Background Technology

[0002] The labeling unit in a blow-to-fill liquid filling production line mainly consists of two parts: a label cutter and a label applicator. The label applicator includes a labeling roller and a rotary container conveying mechanism. The labeling roller has several through holes evenly distributed on its surface. Inside the roller, there is a negative pressure chamber connected to a negative pressure assembly. Each through hole is connected to a negative pressure chamber. Under the action of the negative pressure assembly, a negative pressure is created between the negative pressure chamber and the through holes, thus adsorbing the label onto the roller surface. Around the circumference of the labeling roller, there are sequentially arranged a labeling station for conveying the label to the roller, a labeling station for applying the label to the container, and a label removal station for removing any remaining labels.

[0003] The rotary container conveying mechanism is located at the labeling station of the labeling roller. Its structure includes: a support turntable driven by a rotary drive mechanism, with several labeling stations spaced circumferentially on the support turntable. Each labeling station is equipped with a rotation drive mechanism that drives the container to rotate. The rotation of the support turntable can transport the container to be labeled to the labeling station. The container on the support turntable is tangent to the labeling roller at the labeling station, thereby achieving labeling.

[0004] Currently, due to process requirements, the blow molding machine in the blow-label-fill-spin liquid filling production line adopts constant speed production. During constant speed production, unqualified containers will be generated. Unqualified containers are usually rejected in the rotary container conveying mechanism. This can lead to situations where there are no containers at the labeling station when the container moves to the labeling station. In this case, the label conveyed to the labeling station on the labeling roller will become a missing label. This missing label needs to be rejected at the label rejection station to avoid affecting the normal operation of the entire labeling process.

[0005] Currently, there are two main methods for label rejection in labeling machines: one is to use adhesive paper tape to remove missing labels moving to the label rejection station. This method requires an adhesive paper roll and unwinding drive mechanism, as well as a winding reel and winding device to rewind the label-attached adhesive paper, and related conveyor rollers, etc. This label rejection mechanism using adhesive paper tape is complex in structure and control. The other method involves setting up a vacuum breaking mechanism at the label rejection station, causing labels moving to the label rejection station to fall off the labeling rollers. However, this mechanism has two drawbacks: firstly, it cannot reliably remove labels, which may remain on the labeling rollers, affecting subsequent normal labeling work; secondly, the labels cannot be collected in an orderly manner and are scattered directly in the workshop, which pollutes the filling production environment and affects the normal operation of labeling work. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a label rejection device and a labeling machine using the label rejection device, which can effectively reject missing labels and collect the missing labels in an orderly manner, thereby effectively improving labeling efficiency.

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows: a label rejection device, including a label rejection conveying mechanism, with label rejection conveying mechanism having a label adsorption end and a label collection end at its two ends, respectively. The label rejection conveying mechanism includes: a perforated conveyor belt wound around a roller assembly, the roller assembly including a label suction roller, a label blowing roller, and a power tensioning roller. The roller surface of the label suction roller is provided with label suction through holes connected to the negative pressure assembly of the label suction roller, and the label suction through holes are connected to the holes on the perforated conveyor belt outside it. Under the action of negative pressure, the label can be adsorbed onto the perforated conveyor belt outside the label suction roller; the roller surface of the label blowing roller is provided with label blowing through holes connected to the label blowing compressed gas assembly, and the label blowing through holes are connected to the holes on the perforated conveyor belt outside it. Under the action of compressed gas, the label on the perforated conveyor belt outside the label blowing roller can be blown off; the label suction roller and the label blowing roller are respectively set at the label adsorption end and the label collection end. The labeling roller is positioned close to the label rejection station. A perforated conveyor belt rotates between the label adsorption end and the label collection end in the conveying and return zones. A negative pressure distribution component connected to a negative pressure generating device is located on the inner side of the perforated conveyor belt in the conveying zone. This component is connected to the holes in the perforated conveyor belt running to the conveying zone. Under negative pressure, the label can be adsorbed onto the perforated conveyor belt running to the outside of the negative pressure distribution component. The power tension roller is located in the return zone. A label collection component is provided at the label collection end. The labeling roller is equipped with a label removal mechanism that allows the label reaching the label rejection station to detach from the labeling roller. Under the combined action of the label removal mechanism and the adsorption roller, the label moving to the label rejection station is adsorbed onto the perforated conveyor belt outside the adsorption roller, and then conveyed by the perforated conveyor belt through the conveying zone to the outside of the blowing roller, where it is blown into the label collection component.

[0008] Furthermore, in the aforementioned label rejection device, the label collection assembly includes a label collection box that surrounds the outside of the perforated conveyor belt outside the label blowing roller.

[0009] Furthermore, in the aforementioned label rejection device, at least one label scraper is provided in the label collection box, each label scraper including a scraper body and a scraper head, and each scraper body is mounted on the label collection box; the perforating conveyor belt includes at least two arranged side by side, with a blocking gap left between each two adjacent perforating conveyor belts, and the scraper head of each is blocked in a blocking gap as it rotates away from the label blowing roller.

[0010] Furthermore, in the aforementioned label rejection device, the label collection box is further equipped with a label detection element and a label pushing assembly. The label detection element is used to detect whether labels are accumulated inside the label scraper. The label pushing assembly includes a retractable label pushing rod. When the label detection element detects that labels are accumulated inside the label scraper, the label pushing rod can extend outward and push the labels so that they detach from the label scraper and fall into the label collection box.

[0011] Furthermore, in the aforementioned label rejection device, the structure of the negative pressure distribution component includes: a negative pressure plate body, a plurality of negative pressure plate through holes provided on the side of the negative pressure plate body near the perforated conveyor belt, a negative pressure cavity in the negative pressure plate body that is connected to the negative pressure generating device, and the negative pressure cavity in the plate body being connected to the holes on the perforated conveyor belt through the negative pressure plate through holes.

[0012] Furthermore, in the aforementioned label rejection device, the label removal mechanism comprises: a plurality of rows of label roller through-hole groups are provided on the label roller, all the label roller through-hole groups are spaced apart along the circumference of the label roller, and all the label roller through-holes in each row of label roller through-hole groups are spaced apart along the height direction of the label roller; each row of label roller through-hole groups is connected to a labeling gas chamber located in a corresponding height direction inside the label roller; a labeling gas distribution plate is provided at the top or bottom of the label roller, the labeling gas distribution plate is fixedly installed and sealed with the label roller, the labeling gas distribution plate is provided with mutually separated labeling negative pressure distribution gas grooves and label blowing positive pressure distribution gas grooves, the labeling negative pressure distribution gas grooves are connected to a negative pressure generating device, and the label blowing positive pressure distribution gas grooves are connected to a compressed air source; The labeling negative pressure distribution air groove extends from the corresponding position of the labeling station to the corresponding position of the labeling station. The labeling gas chambers in all labeling rollers that move to the labeling station, the labeling station, and between the two stations are connected to the labeling negative pressure distribution air groove on the labeling negative pressure distribution plate. Under the action of negative pressure, the label can be adsorbed onto the outer wall of the labeling rollers that move to the labeling station, the labeling station, and between the two stations. The label blowing positive pressure distribution air groove is located at the corresponding position of the label rejection station. One of the labeling gas chambers in the labeling roller that moves to the label rejection station is connected to the label blowing positive pressure distribution air groove. Compressed air is ejected from the label blowing positive pressure distribution air groove through the labeling gas chamber and from the through holes of a row of labeling rollers that move to the label rejection station, thereby causing the label outside the through holes of the row of labeling rollers to detach from the labeling roller.

[0013] Furthermore, in the aforementioned label rejection device, a first label detection element is provided on the outer side of the labeling roller between the labeling station and the label rejection station.

[0014] Furthermore, in the aforementioned label rejection device, the label-absorbing roller is provided with several rows of label-absorbing roller through-hole groups, all label-absorbing roller through-holes in each row of label-absorbing roller through-hole groups are arranged at intervals in the height direction of the label-absorbing roller, and all label-absorbing roller through-hole groups are arranged at intervals in the circumferential direction of the label-absorbing roller; the label-absorbing roller negative pressure assembly includes: several label-absorbing roller cavities disposed within the label-absorbing roller, all label-absorbing roller through-holes in each row of label-absorbing roller through-hole groups are connected to a corresponding label-absorbing roller cavity; the label-absorbing roller... A negative pressure gas distribution plate for the label-absorbing roller is provided at the top or bottom. The negative pressure gas distribution plate for the label-absorbing roller is fixedly installed and sealed to the label-absorbing roller. A negative pressure gas distribution groove for the label-absorbing roller is provided on the negative pressure device. The cavity of the label-absorbing roller that moves to the corresponding position of the negative pressure gas distribution groove for the label-absorbing roller is connected to the negative pressure gas distribution groove for the label-absorbing roller. The negative pressure gas distribution groove extends from the corresponding position of the label rejection station to the corresponding position of the end of the negative pressure plate at one end of the label-absorbing roller.

[0015] Furthermore, in the aforementioned label rejection device, the distance between the perforated conveyor belt on the outside of the label-absorbing roller and the label-applying roller at the label rejection station is 0.5mm to 2mm.

[0016] Furthermore, in the aforementioned label rejection device, the label blowing roller is provided with several rows of label blowing roller through-hole groups, all label blowing roller through-holes in each row of label blowing roller through-hole groups are arranged at intervals in the height direction of the label blowing roller, and all label blowing roller through-hole groups are arranged at intervals in the circumferential direction of the label blowing roller; the label blowing compressed gas assembly includes: several label blowing roller positive pressure chambers disposed in the label blowing roller, all label blowing roller through-holes in each row of label blowing roller groups are connected to a corresponding label blowing roller positive pressure chamber, and a label blowing roller compressed gas distribution plate is provided at the top or bottom of the label blowing roller. The compressed gas distribution plate of the label blowing roller is fixedly installed and sealed with the label blowing roller. The compressed gas distribution plate of the label blowing roller is provided with a compressed gas distribution groove connected to the compressed gas source. The positive pressure chamber of the label blowing roller, which moves to the corresponding position of the compressed gas distribution groove, is connected to the compressed gas distribution groove. The compressed gas passes through the compressed gas distribution groove of the label blowing roller, the corresponding positive pressure chamber of the label blowing roller, and then is ejected outward from the corresponding through hole group of the label blowing roller and the holes of the perforated conveyor belt, thereby blowing off the label on the perforated conveyor belt outside the label blowing roller.

[0017] A labeling machine includes: a labeling roller; a labeling station, a labeling station, and a label rejection station arranged sequentially around the labeling roller in the direction of rotation; a label cutting roller at the labeling station; a rotary container conveyor mechanism at the labeling station; several labeling stations spaced circumferentially around the rotary container conveyor mechanism; each container to be labeled is located at one labeling station and conveyed to the labeling station by the rotary container conveyor mechanism; and a label rejection device is provided at the label rejection station. When pre-coated labels are used, a single label is conveyed from the labeling station to the labeling station for labeling.

[0018] Furthermore, the aforementioned labeling machine includes a glue application station located between the labeling station and the labeling station, and a glue application roller is installed at the glue application station. The glue application station is provided to meet the needs of online glue application.

[0019] The advantages of this invention are as follows: 1. The label rejection device has a simple and ingenious structure. It uses a label rejection conveying mechanism to reliably remove missing labels from the labeling roller and collect them orderly in the label collection assembly, thus preventing labels from scattering and contaminating the filling production environment or affecting filling efficiency. 2. The combination of suction roller adsorption and labeling roller blowing outwards reliably conveys labels to the perforated conveyor belt and significantly reduces air consumption, thereby lowering production costs. 3. The negative pressure distribution component in the label rejection device effectively prevents missing labels from falling during conveying. The method of blowing off missing labels using a label blowing roller is simple and easy to implement. 4. The stability of the labeling process is further reliably improved in the labeling machine using this label rejection device. 5. This label rejection device and the labeling machine using it are suitable for labels pre-coated with glue or labels requiring online glue application, with a wide range of applications. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a label rejection device and a labeling machine using the label rejection device according to the present invention.

[0021] Figure 2 yes Figure 1 A magnified schematic diagram of the label rejection device. Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.

[0023] like Figure 1As shown, a labeling machine includes: a labeling roller 2; a labeling station 21, an adhesive application station 29, a labeling station 22, and a label removal station 23 arranged sequentially around the labeling roller 2; a label cutting roller 3 is provided at the labeling station 21; an adhesive application roller 6 is provided at the adhesive application station 29; a rotary container conveying mechanism 4 is provided at the labeling station 22; several labeling stations 41 are arranged circumferentially around the rotary container conveying mechanism 4; each container 5 to be labeled is located on a labeling station 41 and is conveyed to the labeling station 22 by the rotary container conveying mechanism 4; and a label removal device is provided at the label removal station 23. This embodiment only uses labels that require online adhesive application as an example. If pre-coated labels with pre-applied adhesive are used during production, there is no need to set up an adhesive application station, or the adhesive application action is not performed at the adhesive application station.

[0024] like Figure 1 , Figure 2 As shown, a label rejection device includes a label rejection conveying mechanism 1. The label rejection conveying mechanism 1 has a label adsorption end 101 and a label collection end 102 at its two ends. The label rejection conveying mechanism 1 includes a perforated conveyor belt 11, which is wound around a roller assembly. The roller assembly includes a label adsorption roller 12, a label blowing roller 13, and a power tensioning roller 14. The perforated conveyor belt 11 is a conveyor belt whose surface is covered with holes 110.

[0025] The roller surface of the label suction roller 12 is provided with a label suction through hole 121 that is connected to the negative pressure assembly of the label suction roller. The label suction through hole 121 is connected to the hole 110 on the perforated conveyor belt 11 on its outer side. Under the action of negative pressure, the label can be adsorbed onto the perforated conveyor belt 11 on the outer side of the label suction roller 12.

[0026] The roller surface of the label blowing roller 13 is provided with a label blowing through hole 131 that is connected to the label blowing compressed gas assembly. The label blowing through hole 131 is connected to the hole 110 on the perforated conveyor belt 11 on its outer side. Under the action of compressed gas, the label on the perforated conveyor belt 11 on the outer side of the label blowing roller 13 can be blown off.

[0027] The label suction roller 12 and the label blowing roller 13 are respectively set at the label suction end 101 and the label collection end 102. The label suction roller 12 is set close to the label application roller 2 at the label rejection station 23. In order to ensure that the label can be reliably adsorbed from the label application roller 2 onto the perforated conveyor belt 11 outside the label suction roller 12, the distance between the perforated conveyor belt 11 outside the label suction roller 12 at the label rejection station 23 and the label application roller 2 is usually controlled at 0.5 to 2 mm. The perforated conveyor belt 11 rotates between the conveying zone 103 and the return zone 104 between the label adsorption end 101 and the label collection end 102. A negative pressure distribution component 15, connected to a negative pressure generating device, is provided on the inner side of the perforated conveyor belt 11 in the conveying zone 103. The negative pressure distribution component 15 is connected to the holes 110 on the perforated conveyor belt 11 running to the conveying zone 103. Under negative pressure, the label can be adsorbed onto the perforated conveyor belt 11 running to the outside of the negative pressure distribution component 15. Specifically, the structure of the negative pressure distribution component 15 includes: a negative pressure plate 151, with several negative pressure plate through holes 152 on the side of the negative pressure plate 151 near the perforated conveyor belt 11, and a negative pressure cavity 153 connected to the negative pressure generating device within the negative pressure plate 151. The negative pressure cavity 153 communicates with the holes 110 on the perforated conveyor belt 11 outside the negative pressure plate through the negative pressure plate through holes 152. The negative pressure generating device can be a vacuum pump, and the negative pressure generating devices described below all use vacuum pumps.

[0028] The power tension roller 14 is located in the return zone 104. A label collection assembly 16 is provided at the label collection end 102. In this embodiment, the label collection assembly 16 includes a label collection box 161, which surrounds the outside of the perforated conveyor belt 11 disposed on the label blowing roller 13 at the label collection end 102. The label collection box 161 serves to collect the labels in an orderly manner, preventing labels from scattering and affecting filling production.

[0029] The labeling roller 2 is equipped with a label removal mechanism that allows the label to be separated from the labeling roller 2 when it reaches the label rejection station 23. Under the combined action of the label removal mechanism and the suction roller 12, the label that moves to the label rejection station 23 can be adsorbed onto the perforated conveyor belt 11 outside the suction roller 12, and then transported by the perforated conveyor belt 11 through the conveying area 103 to the outside of the blowing roller 13, and then blown by the blowing roller 13 into the label collection assembly 16, that is, into the label collection box 161.

[0030] In this embodiment, the label-absorbing roller 12 is provided with several rows of label-absorbing roller through-hole groups 120. All label-absorbing roller through-holes 121 in each row of label-absorbing roller through-hole groups 120 are arranged at intervals along the height direction of the label-absorbing roller 12, and all label-absorbing roller through-hole groups 120 are arranged at intervals along the circumference of the label-absorbing roller 12. The label-absorbing roller negative pressure assembly includes several label-absorbing roller cavities 122 disposed within the label-absorbing roller 12. All label-absorbing roller through-holes 121 in each row of label-absorbing roller groups 120 are connected to a corresponding label-absorbing roller cavity 122. A label-absorbing roller negative pressure gas distribution plate is provided at the top or bottom of the label-absorbing roller 12. The label-absorbing roller negative pressure gas distribution plate is fixedly disposed and sealed to the label-absorbing roller 12; the seal between the two can be achieved using a sealing gasket. The label-absorbing roller negative pressure gas distribution plate is provided with a label-absorbing roller negative pressure gas distribution groove 124 that is connected to the negative pressure device. The label-absorbing roller cavity 122, which moves to the position corresponding to the label-absorbing roller negative pressure gas distribution groove 124, is connected to the label-absorbing roller negative pressure gas distribution groove 124. The negative pressure gas distribution groove 124 extends from the corresponding position of the label rejection station 23 to the corresponding position of the end of the negative pressure plate 151 located at one end of the label-absorbing roller 12. For simplification, Figure 1 , Figure 2 The text does not specify the negative pressure gas distribution disk of the label suction roller. Figure 1 , Figure 2 The diagram only shows the negative pressure gas distribution groove 124 of the label suction roller.

[0031] In this embodiment, the label blowing roller 13 is provided with several rows of label blowing roller through hole groups 130. All label blowing roller through holes 131 in each row of label blowing roller through hole groups 130 are arranged at intervals in the height direction of the label blowing roller 13, and all label blowing roller through hole groups 130 are arranged at intervals in the circumferential direction of the label blowing roller 13. The label blowing compressed gas assembly includes: several label blowing roller positive pressure chambers 132 disposed in the label blowing roller 13. All label blowing roller through holes 131 in each row of label blowing roller through hole groups 130 are connected to a corresponding label blowing roller positive pressure chamber 132. A label blowing roller compressed gas distribution plate is provided at the top or bottom of the label blowing roller 13. The label blowing roller compressed gas distribution plate is fixedly disposed and sealed with the label blowing roller 13. A label blowing roller connected to a compressed gas source is disposed on the label blowing roller compressed gas distribution plate. The compressed gas distribution groove 133 of the label blowing roller is connected to the positive pressure chamber 132 of the label blowing roller at the corresponding position of the compressed gas distribution groove 133. The compressed gas can pass sequentially through the compressed gas distribution groove 133 of the label blowing roller, the corresponding positive pressure chamber 132 of the label blowing roller, and the corresponding row of through holes 130 of the label blowing roller, and then be ejected outward from the holes 110 of the perforated conveyor belt 11 on its outer side, thereby blowing off the labels on the perforated conveyor belt 11 on the outer side of the label blowing roller 13. For simplification, Figure 1 , Figure 2 The document does not specify the distribution disk for compressed gas on the label blowing roller. Figure 1 , Figure 2 The diagram only shows the compressed gas distribution groove 133 of the label blowing roller.

[0032] In this embodiment, the label removal mechanism includes: a plurality of rows of label roller through-hole groups 240 are provided on the label roller 2, all the label roller through-hole groups 240 are spaced apart circumferentially along the label roller 2, and all the label roller through-holes 24 in each row of label roller through-hole groups 240 are spaced apart along the height direction of the label roller 2; each row of label roller through-hole groups 240 is connected to a labeling gas chamber 25 located in a corresponding height direction inside the label roller 2. A labeling gas distribution plate is provided at the top or bottom of the label roller 2, the labeling gas distribution plate is fixedly installed and sealed with the label roller 2, and the seal between the two can be a sealing gasket. The labeling gas distribution plate is provided with mutually separated labeling negative pressure distribution gas grooves 26 and label blowing positive pressure distribution gas grooves 27, the labeling negative pressure distribution gas grooves 26 are connected to a negative pressure generating device, and the label blowing positive pressure distribution gas grooves 27 are connected to a compressed air source. For simplification, Figure 1 , Figure 2 The label does not indicate the gas distribution disc. Figure 1 , Figure 2 The diagram only illustrates the labeling negative pressure distribution air groove 26 and the label blowing positive pressure distribution air groove 27. The labeling negative pressure distribution air groove 26 extends from the corresponding position of the labeling station 21 to the corresponding position of the labeling station 22. All labeling gas chambers 25 in the labeling rollers 2 of the labeling station 21, the labeling station 22, and the two stations are connected to the labeling negative pressure distribution air groove 26 on the labeling negative pressure distribution plate. Under the action of negative pressure, the label can be adsorbed onto the outer wall of the labeling rollers 2 of the labeling station 21, the labeling station 22, and the two stations.

[0033] The positive pressure distribution air channel 27 is located at the corresponding position of the label rejection station 23. A labeling gas chamber 25 of the labeling roller 2, which moves to the label rejection station 23, is connected to the positive pressure distribution air channel 26. Compressed gas is ejected from the positive pressure distribution air channel 26 through the labeling gas chamber 25 at the label rejection station 23 and the corresponding row of labeling roller through-holes 24, thereby causing the labels outside the through-holes 24 of that row of labeling rollers to detach from the labeling roller 2. The combination of compressed gas blown outwards from the label rejection station 23 via the positive pressure distribution air channel 27 and the through-holes 24 of the labeling rollers, and the adsorption by the suction roller 12, allows the labels to be smoothly transported onto the perforated conveyor belt 11 outside the suction roller 12. This combination of blowing and suction effectively reduces air consumption. The pressure in the positive pressure distribution air channel 26 is typically controlled at 0.1–0.2 MPa.

[0034] In addition, for ease of control and monitoring, a first label detection element 28 is provided on the outside of the labeling roller 2 between the labeling station 22 and the label rejection station 23.

[0035] In this embodiment, at least one label scraper 162 is provided inside the label collection box 161. Each label scraper 162 includes a scraper body 163 and a scraper head 164. Each scraper body 163 is mounted on the label collection box 161. The perforated conveyor belt 11 includes at least two belts arranged side by side, with a blocking gap between each pair of adjacent belts. The scraper head 164 of each belt is blocked in one of the blocking gaps that separates it from the label blowing roller 13. The purpose of providing the label scraper 162 is that when an accident occurs where the label on the perforated conveyor belt 11 outside the label blowing roller 13 fails to be blown off, the label scraper 162 can effectively prevent the label from falling off the perforated conveyor belt.

[0036] In this embodiment, the label collection box 161 is further equipped with a label detection element 165 and a label pushing assembly 166. The label detection element 165 is used to detect whether there are labels accumulated inside the label scraper 162. The label pushing assembly 166 includes a retractable label pushing rod 167. When the label detection element 165 detects that there are labels accumulated inside the label scraper 162, the label pushing rod 167 extends outward to push the labels away from the label scraper 162 and fall into the label collection box 161. The purpose of the label pushing assembly 166 is that when a label is blocked by the label scraper 162 but does not fall in time, and is tangled inside the label scraper 162, the label detection element 165 will detect this state in time, and the label pushing rod 167 will extend in time to push the tangled label off. The retraction and extension of the label pushing rod 167 can be achieved by a cylinder drive.

[0037] The specific working principle is as follows: During the filling process, continuous labels are cut into individual labels on the label cutting roller 3. These individual labels are then conveyed from the labeling station 21 to the labeling roller 2. After being glued at the gluing station 29, the labels are conveyed to the labeling station 22. A rotary container conveying mechanism 4 has several labeling stations 41 spaced circumferentially. Each container 5 to be labeled is located at one labeling station 41 and is conveyed to the labeling station 22 by the rotary container conveying mechanism 4. If there is no container at the labeling station 41, the corresponding label conveyed to the labeling station 22 by the labeling roller 2 becomes a missing label. The missing label moves towards the label rejection station 23 as the labeling roller 2 rotates. During this movement, the first label detection element 28 detects the missing label and sends a signal to the PLC. Under the control of the PLC, when a missing label arrives at the label rejection station 23, compressed air is ejected from the through holes 24 of the labeling rollers 2 located at the label rejection station 23. This causes the missing label to continuously detach from the labeling rollers 2. Simultaneously, under the combined action of the suction rollers 12, the missing labels on the labeling rollers 2 are attracted to the perforated conveyor belt 11 outside the suction rollers 12 at the label rejection station 23. Conveyed by the perforated conveyor belt 11, the missing label completely detaches from the labeling rollers 2 and moves through the conveying area 103 to the outside of the blowing rollers 13. The blowing rollers 13 blow compressed gas outward, causing the missing label to fall off the perforated conveyor belt 11 and into the label collection box 161. The label scraper 162 and the label pusher assembly 166 further ensure that the labels are effectively separated from the perforated conveyor belt 11 and collected in the label collection box 161.

[0038] The advantages of this invention are as follows: 1. The label rejection device has a simple and ingenious structure. It uses a label rejection conveying mechanism to reliably remove missing labels from the labeling roller and collect them orderly in the label collection assembly, thus preventing labels from scattering and contaminating the filling production environment or affecting filling efficiency. 2. The combination of suction roller adsorption and labeling roller blowing outwards reliably conveys labels to the perforated conveyor belt and significantly reduces air consumption, thereby lowering production costs. 3. The negative pressure distribution component 15 in the label rejection device effectively prevents missing labels from falling during conveying. The method of blowing off missing labels using a label blowing roller is simple and easy to implement. 4. The stability of the labeling process is further reliably improved in the labeling machine using this label rejection device. 5. This label rejection device and the labeling machine using it are suitable for labels pre-coated with glue or labels requiring online glue application, with a wide range of applications.

Claims

1. A label rejection device, characterized in that: The system includes a label rejection conveyor mechanism, with label adsorption and label collection ends at its two ends. The label rejection conveyor mechanism comprises: a perforated conveyor belt wound around a roller assembly; the roller assembly including a label suction roller, a label blowing roller, and a power tensioning roller; the label suction roller has label suction through-holes on its surface that communicate with its negative pressure assembly; these through-holes are connected to holes on the perforated conveyor belt outside the label suction roller; under negative pressure, labels are adsorbed onto the perforated conveyor belt outside the label suction roller; the label blowing roller has... It has a label blowing through-hole connected to the label blowing compressed gas assembly. The label blowing through-hole is connected to the holes on the perforated conveyor belt outside it. Under the action of compressed gas, the labels on the perforated conveyor belt outside the label blowing roller can be blown off. The label suction roller and the label blowing roller are respectively set at the label suction end and the label collection end, and the label suction roller is set close to the label sticking roller at the label rejection station. The perforated conveyor belt rotates in the conveying zone and the return zone between the label suction end and the label collection end. The inner side of the perforated conveyor belt in the conveying zone is provided with a negative pressure distribution device connected to the negative pressure generating device. The component, a negative pressure distribution component, is connected to the perforations on the perforated conveyor belt running to the conveying area. Under negative pressure, the label can be adsorbed onto the perforated conveyor belt running to the outside of the negative pressure distribution component. The power tension roller is located in the recovery zone. A label collection component is provided at the label collection end. The labeling roller is equipped with a label removal mechanism that can separate the label running to the label rejection station from the labeling roller. Under the combined action of the label removal mechanism and the label suction roller, the label moving to the label rejection station can be adsorbed onto the perforated conveyor belt outside the label suction roller, and then... The perforated conveyor belt transports the label to the outside of the label blowing roller via the conveying area, and then the label is blown into the label collection assembly by the label blowing roller; the label removal mechanism includes: a number of rows of label roller through holes are provided on the label roller, a label gas distribution plate is provided at the top or bottom of the label roller, the label gas distribution plate is fixedly installed and sealed with the label roller, the label gas distribution plate is provided with mutually separated label negative pressure distribution air grooves and label blowing positive pressure distribution air grooves, the label negative pressure distribution air grooves are connected to the negative pressure generating device, and the label blowing positive pressure distribution air grooves are connected to the compressed air source.

2. The label rejection device according to claim 1, characterized in that: The label collection assembly includes a label collection box that surrounds the outside of the perforated conveyor belt outside the label blowing roller.

3. The label rejection device according to claim 2, characterized in that: The label collection box is equipped with at least one label scraper, each label scraper includes a scraper body and a scraper head, and each scraper body is mounted on the label collection box; the perforating conveyor belt includes at least two side by side, and there is a blocking gap between each two adjacent perforating conveyor belts, and each scraper head is blocked in a blocking gap as it rotates away from the label blowing roller.

4. The label rejection device according to claim 3, characterized in that: The label collection box is also equipped with a label detection element and a label pushing assembly. The label detection element is used to detect whether labels are accumulated inside the label shovel. The label pushing assembly includes a retractable label pushing rod. When the label detection element detects that there are labels accumulated inside the label shovel, the label pushing rod can extend outward and push the labels so that the labels are separated from the label shovel and fall into the label collection box.

5. A label rejection device according to any one of claims 1 to 4, characterized in that: The structure of the negative pressure distribution component includes: a negative pressure plate body, a number of negative pressure plate through holes on the side of the negative pressure plate body near the perforated conveyor belt, a negative pressure cavity in the negative pressure plate body that is connected to the negative pressure generating device, and the negative pressure cavity in the plate body is connected to the holes on the perforated conveyor belt through the negative pressure plate through holes.

6. A tag rejection device according to any one of claims 1 to 4, characterized in that: All labeling roller through-hole groups are spaced apart circumferentially along the labeling rollers, and all through-holes in each row of labeling roller through-hole groups are spaced apart along the height direction of the labeling rollers; each row of labeling roller through-hole groups is connected to a labeling gas chamber located in a corresponding height direction within the labeling roller; the labeling negative pressure distribution groove extends from the corresponding position of the upper labeling station to the corresponding position of the labeling station, and the labeling gas chambers in all labeling rollers moving to the upper labeling station, the labeling station, and between the two stations are connected to the labeling negative pressure distribution plate on the labeling negative pressure distribution plate. The air distribution groove is connected, and under negative pressure, the label can be adsorbed onto the outer wall of the labeling station, the labeling station, and the labeling roller between the two stations. The positive pressure air distribution groove is located at the corresponding position of the label rejection station. One of the labeling gas chambers of the labeling roller that moves to the label rejection station is connected to the positive pressure air distribution groove. Compressed air is ejected from the positive pressure air distribution groove through the labeling gas chamber and from the through hole group of a row of labeling rollers that moves to the label rejection station, thereby causing the label on the outside of the through hole group of the labeling rollers to detach from the labeling roller.

7. The label rejection device according to claim 6, characterized in that: A first label detection element is installed on the outside of the labeling roller between the labeling station and the label rejection station.

8. A label rejection device according to claim 5, characterized in that: The label-absorbing roller has several rows of label-absorbing roller through-hole groups. All the label-absorbing roller through-holes in each row are spaced apart along the height of the label-absorbing roller, and all the label-absorbing roller through-hole groups are spaced apart circumferentially. The label-absorbing roller negative pressure assembly includes several label-absorbing roller cavities disposed within the label-absorbing roller. All the label-absorbing roller through-holes in each row are connected to a corresponding label-absorbing roller cavity. Label-absorbing rollers are disposed at the top or bottom of the label-absorbing roller. The label suction roller has a fixed negative pressure gas distribution plate that is sealed to it. The label suction roller has a negative pressure gas distribution groove that is connected to the negative pressure device. The cavity of the label suction roller that moves to the corresponding position of the label suction roller is connected to the label suction roller negative pressure gas distribution groove. The label suction roller negative pressure gas distribution groove extends from the corresponding position of the label rejection station to the corresponding position of the negative pressure plate at one end of the label suction roller.

9. A label rejection device according to claim 8, characterized in that: The distance between the perforated conveyor belt on the outside of the label suction roller and the labeling roller at the label removal station is 0.5mm to 2mm.

10. A tag rejection device according to any one of claims 1 to 4, characterized in that: The label blowing roller is provided with several rows of label blowing roller through holes. All the label blowing roller through holes in each row are spaced apart along the height of the label blowing roller, and all the label blowing roller through hole groups are spaced apart circumferentially. The label blowing compressed gas assembly includes: several label blowing roller positive pressure chambers disposed within the label blowing roller. All the label blowing roller through holes in each row are connected to a corresponding label blowing roller positive pressure chamber. A label blowing roller compressed gas distribution plate is provided at the top or bottom of the label blowing roller. The distribution plate is fixedly installed and sealed to the label blowing roller. The label blowing roller compressed gas distribution plate is provided with a label blowing roller compressed gas distribution groove connected to the compressed gas source. The label blowing roller positive pressure chamber that moves to the corresponding position of the label blowing roller compressed gas distribution groove is connected to the label blowing roller compressed gas distribution groove. The compressed gas passes through the label blowing roller compressed gas distribution groove, the corresponding label blowing roller positive pressure chamber in sequence, and then is ejected outward from the corresponding label blowing roller through hole group and the holes of the perforated conveyor belt, thereby blowing off the label on the perforated conveyor belt outside the label blowing roller.

11. A labeling machine, comprising: A labeling roller is provided with a labeling station, a labeling station, and a label rejection station arranged sequentially around the roller in the direction of rotation. A label cutting roller is provided at the labeling station, and a rotary container conveying mechanism is provided at the labeling station. Several labeling stations are arranged at circumferential intervals around the rotary container conveying mechanism. Each container to be labeled is located at a labeling station and is conveyed to the labeling station by the rotary container conveying mechanism. The label rejection station is characterized by having a label rejection device as described in any one of claims 1 to 10.

12. A labeling machine according to claim 11, characterized in that: A glue application station is set up between the labeling station and the labeling station, and a glue application roller is installed at the glue application station.

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