CN115722456A - Automatic label defect screening equipment - Google Patents

Abstract

The invention relates to automatic label defect screening equipment which comprises an equipment base, a feeding mechanism and a screening mechanism, wherein the two sides of the equipment base are respectively provided with the feeding mechanism and the screening mechanism; the feeding mechanism comprises a workbench, a label placing table and a turnover mechanism, the workbench is fixedly mounted above the equipment base, support frames which are arranged in pairs along the vertical direction in an extending mode are arranged on the workbench, the support frames are provided with the label placing table, and a feeding unit used for fixing the position of the label is arranged in the label placing table. The structure finishes the displacement transmission of the labels in the two processes of visual detection through the turnover mechanism and the transfer mechanism which are separated, thereby improving the efficiency of label transmission, and automatically distinguishing the labels conveyed by the transfer mechanism according to the detection result through the screening mechanism.

Description

Automatic label defect screening equipment

Technical Field

The invention relates to label detection equipment, in particular to automatic label defect screening equipment.

Background

The product label is mainly used for arranging the outer surface or the inner surface of the product and displaying information related to the product. The form of the label is also various, and the label is a flexible label similar to paper and is fixed on a product in a sticking or sewing way; there are also rigid labels, like plastic sheets, which are fixed to the product by their own means of fixation. It is certain that most labels are in sheet form and need to be inspected before shipment to ensure that the shape and appearance are free of obvious flaws or breakage. Meanwhile, some labels are directly printed before leaving a factory, and whether the content on the labels is complete and clear needs to be detected.

To the detection mode of label surface flaw and defect, some producers still are more traditional manual mode, and the manual work is with label surface smooth in checkout stand surface back, under the illumination of light, directly inspect label surface flaw and defect through people's eye, nevertheless the light on the checkout stand shines people's eye for a long time, causes chronic injury to people's eye easily, and long-time incessant label detection achievement can produce visual fatigue, the wrong detection appears, leak the scheduling problem of examining to influence the detection efficiency and the quality of label.

Some manufacturers also use automated detection equipment, for example, a visual detection device for label production equipment disclosed in chinese patent CN202023136936.7, in which a label identification mechanism, a label position detection mechanism, and a defective marking mechanism are sequentially arranged on a plate along a label tape conveying direction, so as to meet the requirements of automated operations of label identification, position degree detection, and defective marking.

Although realized automated inspection among the above-mentioned technical scheme, the defective products of beating the setting of marking the structure simultaneously also can mark the flaw label that detects out, nevertheless still need the manual work to sieve the label district that transports on the label material area according to the mark that the defective products were beaten the mark structure and were done still, unable automatic screening is removed the defective products.

Meanwhile, the equipment only can be used for strip-shaped continuous label products, and cannot be applied to labels with large areas and single-sheet forms. Labels in single sheet form cannot be transported in arrays such as tractor or conveyor belts due to their independence, sheet construction, and light weight. The automatic flaw detection mode is mainly through image detection, so how to solve the detection in the transfer process is a technical problem mainly needed to be solved.

One scheme in the prior art is that a label is sucked through a sucker and translated, the label is stopped in translation, a camera shoots the label from the direction opposite to that of the sucker, a flaw is detected, a finished feedback result is detected and fed back to a control system, and the destination of the sucker is determined through the control system so as to screen the qualified label and the flawed label. Although the technical scheme basically solves the problem of automatic detection, the efficiency is low. The main reason is that the manipulator absorbs the label and then reaches the detection position and is started and stopped for one time, and the manipulator starts and stops for the second time from the detection position to the final screening position. The efficiency of starting and stopping twice is lower, and simultaneously, in order to reduce cost, the moving of the manipulator is controlled by a synchronous belt, and the speed is also lower. In addition, in the terminal screening process, two corresponding target positions of qualified and defective labels are needed, so that the structure of the moving mechanism is complex, and the cost of the whole set of equipment is further increased.

Disclosure of Invention

In order to solve the problems, the invention provides the automatic label defect screening equipment which can automatically detect the defects and flaws on the surface of the label through the visual detection mechanism, can automatically classify the qualified label and the defective label according to the detection result, and can quickly complete the detection and screening process.

In order to achieve the purpose, the automatic label defect screening equipment comprises an equipment base, a feeding mechanism and a screening mechanism, wherein the two sides of the equipment base are respectively provided with the feeding mechanism and the screening mechanism, a transferring mechanism for conveying labels is arranged between the feeding mechanism and the screening mechanism, and a visual detection mechanism is arranged between the feeding mechanism and the transferring mechanism; feed mechanism includes that workstation, label place the platform and turn over a mechanism, workstation fixed mounting is in equipment base top, is provided with on the workstation and extends the support frame that sets up in pairs along vertical direction, the support frame on be provided with the label and place the platform, one side that all labels placed the platform is connected with the support frame through lift slip table, the opposite side that the platform was placed to the label passes through hinged joint portion and is connected with the support frame to be provided with the pay-off unit that is used for fixed label position in the platform is placed to the label, support frame top fixed mounting has the cantilever that extends towards visual detection mechanism one side, turn over a mechanism and connect in the cantilever below through the transmission of swing subassembly.

According to the scheme, the position of the label on the label placing table is fixed through the feeding unit, so that the label can be automatically grabbed by the turnover mechanism conveniently; the label displacement transmission in the two processes of the visual detection is completed through the discrete turnover mechanism and the discrete shifting mechanism, so that the efficiency of label transmission is improved, the visual detection mechanism automatically detects the flaws and defects on the surface of the label, and the screening mechanism automatically distinguishes the label transmitted by the shifting mechanism according to the detection result. Simultaneously through the setting of lift slip table and hinge joint portion for the device can finely tune the angle that the platform was placed to the label according to actual need and turn over snatching of a mechanism with the adaptation.

The feeding unit comprises a width clamping part, a height blocking frame and a feeding ejector rod, wherein the label placing table is obliquely arranged, the middle of the label placing table is provided with the feeding ejector rod, the position of the front end of the feeding ejector rod is adjusted in a mode of pulling the handle outwards so as to conveniently place the label to be detected, the width clamping part is symmetrically arranged on the two sides of the feeding ejector rod, the width clamping part drives the width clamping part to be close to or away from each other through rotation of the adjusting knob, and the height blocking frame used for covering the whole label is arranged on the outer side of the width clamping part.

In the above scheme, the pressure spring can be sleeved on the feeding ejector rod, the pressing force is provided through the pressure spring, so that the label at the most front end is always kept at the grabbing position, the handle on the feeding ejector rod is pulled outwards during manual feeding, a space is reserved, the label is conveniently stacked in a material channel formed by the label clamping part, after the label is stacked, the handle is loosened, and the feeding ejector rod automatically jacks back to the label stacked in the material channel under the action of the pressure spring force. On the other hand, through the arrangement of the adjusting knob, the distance between the width clamping parts at two sides is adjusted according to the width of the label stacked in the feeding unit, and through the arrangement of the height blocking frame, the label is further fixed in the feeding unit, so that the smooth operation of the subsequent process is ensured, and the size can be adjusted and limited as required to adapt to labels of various sizes.

A further scheme is, a mechanism of turning over include swing arm, first belt pulley, second belt pulley, drive actuating cylinder and sucking disc subassembly, the swing subassembly includes first box, second box, first horizontal transmission shaft, drive shaft and second horizontal transmission shaft, the swing arm is terminal to place the platform below at the label through being used for driving the actuating cylinder setting of its luffing motion, the cantilever is fixed on the lateral wall of support frame, support frame one end is kept away from in the cantilever through first horizontal transmission shaft setting to first box, set up the drive shaft that extends along vertical direction between second box and the first box, the second belt pulley passes through the cooperation of the outside second horizontal transmission shaft that stretches out in the second box and installs at the swing arm middle part, and the swing arm is installed on the support frame inside wall through first axis of rotation, first axis of rotation be located between second belt pulley and the drive actuating cylinder, and the swing arm front end is provided with first belt pulley, is connected through first synchronous belt drive between first belt pulley and the second belt pulley, first belt pulley and sucking disc subassembly pass through second axis of rotation drive connection.

Through the first box and the second box that provide two degrees of freedom among the above-mentioned scheme, and around first horizontal drive axle wobbling swinging arms, convert the motion of swinging arms into the rotation of second belt pulley, thereby only drive actuating cylinder through one and drive the wide-angle displacement swing that the swing arm front end is located the label and places platform outside sucking disc, make the sucking disc along with the swing arm when upwards swinging to the peak, after the label of erectting in the platform is placed to the automatic grabbing label, the sucking disc is along with the swing arm when downwards swinging to the minimum, with the label that snatchs on the sucking disc on the detection platform of label placing platform below flatly.

A further scheme is that an upper buffer device extending towards the outer side of the label placing table is arranged between the width clamping part and the lifting sliding table, a lower buffer device extending upwards along the vertical direction is arranged below the swing arm, and the lower buffer device is fixedly arranged above the workbench through a positioning part.

Above-mentioned scheme is through last buffer and lower buffer's setting, and the impulsive force when slowing down the swing arm back and forth swing to offset and drive actuating cylinder and lead to exporting great to whole mechanism production vibrations for improving output efficiency.

According to a further scheme, the visual detection mechanism comprises a CCD camera and a detection platform, the detection platform is located between the turnover mechanism and the transfer mechanism, and the CCD camera used for detecting the label defects is arranged right above the detection platform.

According to the scheme, the quality of the label on the detection platform is automatically detected through the arrangement of the CCD camera.

According to a further scheme, the transfer mechanism comprises a first connecting rod module and a second connecting rod module which are symmetrically arranged, the structure of the second connecting rod module is the same as that of the first connecting rod module, the first connecting rod module comprises a first rocker, a second rocker, a connecting rod frame and a connecting rod frame, the connecting rod frame is fixedly installed in the middle of the equipment base and located between the detection platform and the screening mechanism, one end of the first rocker is in transmission connection with a third rotating shaft at the lower portion of the connecting rod frame, one end of the second rocker is in transmission connection with a fourth rotating shaft at the upper portion of the connecting rod frame, the third rotating shaft is connected to the driving motor, the third rotating shaft is in transmission connection with the fourth rotating shaft through a second synchronous belt, the second rocker is connected with the first rocker through the connecting rod frame, and a label suction plate is connected between the first connecting rod in the second connecting rod module and the connecting rod in the first connecting rod module.

Above-mentioned scheme passes through the rotation that driving motor drove the third axis of rotation, drives first rocker around the side link seesaw in two connecting rod modules through the third axis of rotation, drives the rotation of fourth axis of rotation through the mode of belt drive simultaneously, drives second rocker and side link around the side link seesaw through the fourth axis of rotation to realize the back and forth movement of label suction disc, with the label automatic transportation on the testing platform to in the screening mechanism.

Further scheme be, screening mechanism include mounting bracket and label recycling bin, the position and the label of label recycling bin are absorbed board stroke end position cooperation, and label recycling bin top is provided with the label that is used for covering the recovery mouth of label recycling bin and is put the board, and the mounting bracket top is provided with the location mounting panel, and location mounting panel top is provided with the horizontal slip unit, label put the board and be connected with the horizontal slip unit, put the board through the horizontal slip unit drive label and make a round trip the translation along the horizontal direction and realize the open and close state of label recycling bin.

The characteristics of above-mentioned scheme are that put the translation of board through the label and realize the switching state of label recycling bin, when what snatch on the label suction plate is the flaw label, through moving the label suction plate of mechanism drive and put into the label recovery mouth in the label recycling bin with the label that snatchs on its sucking disc of carrying, in order to retrieve the flaw label, when what snatch on the label suction plate is qualified label, the label is put the board and is then moved to label recycling bin top and accept qualified label, so that it gets into next station. Finally, the purpose that the screening mechanism can automatically classify the labels according to the detection result is achieved. The screening mode does not depend on the action of the transferring mechanism, so that the grabbing and transferring efficiency of the transferring mechanism can be improved.

The further scheme is that the screening mechanism further comprises a third connecting rod module and a packing machine, wherein the structure of the third connecting rod module is consistent with that of the first connecting rod module, the packing machine is arranged on one side of the label recovery cylinder, a label shaping position is arranged in the packing machine, and the label shaping position and the label recovery cylinder are arranged at the tail end and the beginning end of the movement path of the label suction plate in the third connecting rod module.

Above-mentioned scheme snatchs the automatic qualified label that puts the board and put through the label suction plate in the third connecting rod module to carry out the plastic in transporting the qualified label shaping position in the baling press that it snatched, when the qualified label accumulation in the baling press is deposited to preset quantity, automatic parcel into with qualified label packing has promoted the whole degree of automation of this equipment.

The automatic label defect screening equipment designed by the invention has the following characteristics:

1. the whole quality inspection process is divided into two steps of detection and screening, and the two stages are mutually independent, so that the rhythm and the efficiency of quality inspection are effectively improved.

2. Utilize swing mode conveying label at the detection stage, constitute swing mechanism by a mechanism and swing subassembly, through structural design, under the drive of an independent cylinder, accomplish the two segmentation swings of swing arm and sucking disc subassembly, not only realized from the pay-off unit to testing platform's label conveying, still realized the flexible of sucking disc subassembly on the horizontal position for swing mechanism lets out the space on testing platform upper portion completely when returning the material unit and snatching next label, makes things convenient for visual inspection mechanism to shoot the picture of label.

3. The turnover mechanism is driven by the cylinder, and the buffer device is correspondingly arranged, so that the cylinder can fully exert the characteristics of high frequency and high speed.

4. The state of the label recycling drum is switched through the label placing plate which slides back and forth to achieve the purpose of screening, the moving mechanism only needs to complete the movement of moving and conveying labels, the movement process is simplified compared with the prior art, and the conveying efficiency can be improved.

5. And a sorting and packing device is also arranged subsequently, so that all processes of detecting the package are completed at one time.

In conclusion, the label detection device can automatically grab the label in the feeding device through the turnover mechanism, and reduce misjudgment and missed judgment in the label quality detection process through the visual detection mechanism, so that the automation of the whole label detection process of label blanking, detection, transportation, screening and packaging is realized, the label detection efficiency is effectively improved, and the labor cost of manpower is reduced.

Drawings

Fig. 1 is an isometric view of an automated screening apparatus for visually accurately detecting label defects.

Fig. 2 is an isometric view of the feed mechanism.

Fig. 3 is a schematic structural view of the folding mechanism.

Fig. 4 is a side view of the feeding mechanism.

Fig. 5 is a top view of the feeding mechanism.

Fig. 6 is a schematic structural diagram of the feeding mechanism.

Fig. 7 is a partially enlarged view of the area a in fig. 6.

Fig. 8 is a schematic structural view of the visual inspection mechanism.

Fig. 9 is a schematic view of the structure of the transplanting mechanism.

Fig. 10 is a schematic structural view of the screening mechanism.

Fig. 11 is a top view of the automated screening apparatus for visually accurately detecting a defect in a label.

Fig. 12 is an installation schematic diagram of the feeding mechanism, the visual inspection mechanism and the transplanting mechanism.

Fig. 13 is a partially enlarged view of the region B in fig. 12.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Example 1.

As shown in fig. 1 and 2, the automatic label defect screening apparatus described in this embodiment includes an apparatus base 1, a feeding mechanism 2, and a screening mechanism 3, wherein the feeding mechanism 2 and the screening mechanism 3 are respectively disposed on two sides of the apparatus base 1, a transferring mechanism 4 for transporting labels is disposed between the feeding mechanism 2 and the screening mechanism 3, and a vision inspection mechanism 5 is disposed between the feeding mechanism 2 and the transferring mechanism 4; feed mechanism 2 includes that workstation 21, label place platform 22 and a mechanism 23 that turns over, workstation 21 fixed mounting is in equipment base 1 top, is provided with on the workstation 21 and extends the support frame 24 that sets up in pairs along vertical direction, support frame 24 on be provided with the label and place platform 22, the label place one side of platform 22 and be connected with support frame 24 through lift slip table 28, the opposite side that the platform 22 was placed to the label is passed through hinge joint portion 29 and is connected with support frame 24 to be provided with the feeding unit 25 that is used for fixed label position in the platform 22 is placed to the label, support frame 24 top fixed mounting has the cantilever 26 that extends towards visual detection mechanism 5 one side, it connects in cantilever 26 below through swing subassembly 27 transmission to turn over a mechanism 23.

As shown in fig. 1 to 7, the feeding unit 25 includes a width clamping portion 251, a height blocking frame 252 and a feeding rod 253, the label placing table 22 is obliquely disposed, the feeding rod 253 is disposed in the middle of the label placing table 22, the feeding rod 253 controls the distance between the feeding rod 253 and the discharge hole by pulling the handle 255 outwards, the width clamping portion 251 is symmetrically disposed on both sides of the feeding rod 253, the width clamping portion 251 drives the width clamping portion 251 to approach or separate from each other by rotation of the adjusting knob 254, the height blocking frame 252 for covering the whole label is disposed outside the width clamping portion 251, an upper buffer 256 extending towards the outside of the label placing table 22 is disposed between the width clamping portion 251 and the lifting sliding table 28, a lower buffer 257 extending upwards in the vertical direction is disposed below the swing arm 231, and the lower buffer 257 is fixedly mounted above the working table 21 by the positioning portion 258. Meanwhile, a pressure spring is sleeved on the feeding ejector rod 253, so that the pressure of feeding is provided conveniently by the pressure spring.

The turnover mechanism 23 comprises a swing arm 231, a first belt pulley 232, a second belt pulley 233, a driving air cylinder 234 and a sucker assembly 235, the swing assembly 27 comprises a first box body 271, a second box body 272, a first horizontal transmission shaft 274, a driving shaft 273 and a second horizontal transmission shaft 275, the tail end of the swing arm 231 is arranged below the label placing table 22 through the driving air cylinder 234 for driving the swing arm to swing up and down, the cantilever 26 is fixed on the outer side wall of the support frame 24, the first box body 271 is arranged in the cantilever 26 through the first horizontal transmission shaft 274 and far away from one end of the support frame 24, the driving shaft 273 extending along the vertical direction is arranged between the second box body 272 and the first box body 271, the second belt pulley 233 is arranged in the middle of the swing arm 231 through the second horizontal transmission shaft 275 extending out of the second box body 272 in a matching manner, the swing arm 231 is arranged on the inner side wall of the support frame 24 through the first rotating shaft 236, the first rotating shaft 236 is arranged between the second belt pulley 233 and the driving air cylinder 234, the front end of the swing arm 231 is provided with the first belt pulley 232, the first belt pulley 232 is connected with the sucker assembly 235 through a synchronous transmission belt 237, and the second belt pulley 233 is connected with the second belt pulley 235.

As shown in fig. 1 and 8, the visual inspection mechanism 5 includes a CCD camera 51 and an inspection platform 52, the inspection platform 52 is located between the folding mechanism 23 and the transferring mechanism 4, and the CCD camera 51 for detecting the label defect is disposed right above the inspection platform 52.

As shown in fig. 1 and 9, the transfer mechanism 4 includes a first link module 41 and a second link module 42 that are symmetrically disposed, and the second link module 42 and the first link module 41 have the same structure, the first link module 41 includes a first rocker 411, a second rocker 412, a link 413 and a link frame 414, the link frame 414 is fixedly installed in the middle of the apparatus base 1, the link frame 414 is located between the detection platform 52 and the screening mechanism 3, one end of the first rocker 411 is in transmission connection with a third rotating shaft 415 at the lower part of the link frame 414, one end of the second rocker 412 is in transmission connection with a fourth rotating shaft 416 at the upper part of the link frame 414, the third rotating shaft 415 is connected to a driving motor 418, the third rotating shaft 415 is in transmission connection with the fourth rotating shaft 416 through a second synchronous belt, the second rocker 412 is connected with the first rocker 411 through the link 413, and a label-picking plate 417 is connected between the first link 413 in the second link module 42 and the link 413 in the first link module 41.

As shown in fig. 10-13, the screening mechanism 3 includes a mounting frame 31, a label recycling cylinder 32, a third link module 36 and a packing machine 37, the position of the label recycling cylinder 32 is matched with the end position of the stroke of the label suction plate 417, a label placing plate 35 for covering the recycling port of the label recycling cylinder is arranged above the label recycling cylinder 32, a positioning mounting plate 33 is arranged above the mounting frame 31, a horizontal sliding unit 34 is arranged above the positioning mounting plate 33, the label placing plate 35 is connected with the horizontal sliding unit 34, and the label placing plate 35 is driven by the horizontal sliding unit 34 to move back and forth along the horizontal direction to realize the open and close state of the label recycling cylinder; the structure of the third link module 36 is the same as that of the first link module 41, a packer 37 is arranged on one side of the label recovery cylinder 32, a label shaping position 38 is arranged in the packer 37, and the label shaping position 38 and the label recovery cylinder 32 are arranged at the tail end and the beginning end of the movement path of the label suction plate 417 in the third link module 36.

Automatic label defect screening equipment

In operation, the spacing between the two width clamping portions 251 is first adjusted by the adjustment knob 254 to fit the width of the label. By pulling the grip 255 outward to retract the feeder ram 253,

the stacked labels are then placed vertically onto the feed unit 25. The height and angle of the whole label placing table 22 are adjusted by the hinge connection part 29, and the hinge connection part 29 comprises a long circular groove and a waist circular hole, so that the height adjustment and the angle adjustment which can slide up and down can be realized, and the outlet of the feeding unit 25 corresponds to the movement path of the turnover mechanism 23.

Starting the whole device, driving the piston rod pusher in the driving cylinder 234 to drive the swing arm 231 to swing back and forth up and down around the first rotating shaft 236, when the swing arm 231 swings upwards, the first horizontal transmission shaft 274 and the first box 271 are matched to form a rotating degree of freedom alpha of the first box 271, so that the driving cylinder 234 drives the swing arm 231 to swing upwards around the first rotating shaft 236, and simultaneously, the first box 271 can rotate around the first horizontal transmission shaft 274 fixedly arranged on the cantilever through the transmission of the driving shaft 273;

since the driving shaft 273 is engaged with the first casing 271, the first casing 271 can move axially relative to the driving shaft 273, and due to the aforementioned degree of freedom α, the driving shaft 273 can swing around the first horizontal transmission shaft 274 while moving axially relative to the first casing 271;

because the driving shaft 273 is matched with the second box 272, the second box 272 can also move on the driving shaft 273 along the axial direction of the driving shaft 273, and the second box 272 also has a degree of freedom gamma of rotating around the first horizontal transmission shaft 274, so that the first box 271 and the second box 272 arranged at the upper end and the lower end of the driving shaft 273 are close to or far away from each other while the swing arm 231 swings back and forth around the first rotating shaft 236, and simultaneously, under the control of the two degrees of freedom of rotation, the final motion state of the driving shaft 273 is converted into the kinetic energy for driving the second horizontal transmission shaft 275 to rotate;

the first belt pulley 20 is driven by the rotation of the second horizontal transmission shaft 275, and the L-shaped connecting piece is driven to swing by the synchronous belt, the second belt pulley 21 and the second rotating shaft 30, so that the suction cup 31 moves back and forth at the feeding position and the discharging position, automatically picks the label stacked in the feeding unit 9, places the label on the detection platform 52, and then continuously returns to pick the label.

At this time, the CCD camera 51 photographs the label on the inspection stage 52, determines whether the quality thereof is acceptable, and transmits the inspection result to the control module. After the detection is finished, the transplanting mechanism 4 controls the label suction plate 417 to suck the labels and transmit the labels to the screening mechanism 3.

After the screening mechanism 3 acquires the detection result, the position of the label placing plate 35 is controlled according to the result. When the label has a defect, the label placing part 35 is moved away from the recovery opening of the label recovery cylinder 32, the recovery opening is exposed, and the defective label sent by the transplanting mechanism 4 directly falls into the label recovery cylinder 32. When the label is a non-defective label, the label placing plate 35 is held above the label collecting drum 32 and receives the label transferred by the transfer mechanism 4.

Finally, the label on the label placing plate 35 is continuously transferred to the packing machine 37 by the movement of the third link module 36, and finishing the sorting and packing.

In the above-described operation, the folding mechanism 23, the transplanting mechanism 4, and the third link module 36 all operate repeatedly in the same rhythm.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment. Those skilled in the art should make equivalent embodiments with equivalent changes and modifications according to the technical contents disclosed above without departing from the technical scope of the present invention, and any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the technical scope of the present invention.

Claims (8)

1. An automatic label defect screening device comprises a device base (1), a feeding mechanism (2) and a screening mechanism (3), and is characterized in that the feeding mechanism (2) and the screening mechanism (3) are respectively arranged on two sides of the device base (1), a transferring mechanism (4) for conveying labels is arranged between the feeding mechanism (2) and the screening mechanism (3), and a visual detection mechanism (5) is arranged between the feeding mechanism (2) and the transferring mechanism (4); feed mechanism (2) place platform (22) and turn over a mechanism (23) including workstation (21), label, workstation (21) fixed mounting is in equipment base (1) top, is provided with on workstation (21) and extends support frame (24) that set up in pairs along vertical direction, support frame (24) on be provided with the label and place platform (22), the label place one side of platform (22) and be connected with support frame (24) through lift slip table (28), the opposite side that platform (22) was placed to the label passes through hinge joint portion (29) and is connected with support frame (24) to be provided with pay-off unit (25) that are used for fixed label position in platform (22) is placed to the label, support frame (24) top fixed mounting has cantilever (26) towards vision detection mechanism (5) one side extension, turn over a mechanism (23) and connect in cantilever (26) below through swing subassembly (27) transmission.

2. The automatic label defect screening device according to claim 1, wherein the feeding unit (25) comprises a width clamping portion (251), a height blocking frame (252) and a feeding ejector rod (253), the label placing table (22) is obliquely arranged, the feeding ejector rod (253) is arranged in the middle of the label placing table (22), the feeding ejector rod (253) can be pulled by a handle (255) arranged at the tail of the feeding ejector rod (253), the width clamping portions (251) are symmetrically arranged on two sides of the feeding ejector rod (253), the width clamping portions (251) drive the width clamping portions (251) to approach or separate from each other through rotation of an adjusting knob (254), and the height blocking frame (252) for covering the whole label is arranged outside the width clamping portions (251).

3. The automatic screening device for the label defects according to claim 2, wherein the folding mechanism (23) comprises a swing arm (231), a first belt pulley (232), a second belt pulley (233), a driving cylinder (234) and a suction cup assembly (235), the swing assembly (27) comprises a first box body (271), a second box body (272), a first horizontal transmission shaft (274), a driving shaft (273) and a second horizontal transmission shaft (275), the tail end of the swing arm (231) is arranged below the label placing table (22) through the driving cylinder (234) for driving the swing arm to swing up and down, the cantilever (26) is fixed on the outer side wall of the supporting frame (24), the first box body (271) is arranged in the cantilever (26) through the first horizontal transmission shaft (274) at the end far away from the supporting frame (24), the driving shaft (273) extending along the vertical direction is arranged between the second box body (272) and the first box body (271), the second belt pulley (233) is arranged on the swing arm (231) through a second horizontal transmission shaft (275) extending out of the second box body (272), the swing arm (231) is arranged on the middle of the swing arm (231), and the first rotation shaft (236) is arranged between the swing arm (231), and swing arm (231) front end is provided with first belt pulley (232), is connected through first synchronous belt transmission between first belt pulley (232) and second belt pulley (233), first belt pulley (232) are connected through second axis of rotation (237) transmission with sucking disc subassembly (235).

4. The automatic label defect screening apparatus according to claim 3, wherein an upper buffer device (256) extending toward the outside of the label placing table (22) is provided between the width clamping portion (251) and the lifting and sliding table (28), a lower buffer device (257) extending upward in the vertical direction is provided below the swing arm (231), and the lower buffer device (257) is fixedly mounted above the working table (21) through a positioning portion (258).

5. The automatic label defect screening device according to claim 4, wherein the visual inspection mechanism (5) comprises a CCD camera (51) and an inspection platform (52), the inspection platform (52) is located between the turnover mechanism (23) and the transfer mechanism (4), and the CCD camera (51) for inspecting the label defects is arranged right above the inspection platform (52).

6. The automatic label defect screening apparatus according to any one of claims 1 to 5, it is characterized in that the transfer mechanism (4) comprises a first connecting rod module (41) and a second connecting rod module (42) which are symmetrically arranged, and the second link module (42) has the same structure as the first link module (41), the first link module (41) comprises a first rocker (411), a second rocker (412), a link rod (413) and a link rod rack (414), a connecting rod rest (414) is fixedly arranged in the middle of the equipment base (1), the connecting rod rest (414) is positioned between the detection platform (52) and the screening mechanism (3), one end of the first rocker (411) is in transmission connection with a third rotating shaft (415) at the lower part of the connecting rod frame (414), one end of the second rocker (412) is in transmission connection with a fourth rotating shaft (416) at the upper part of the connecting rod frame (414), the third rotating shaft (415) is connected to a driving motor (418), the third rotating shaft (415) is in transmission connection with the fourth rotating shaft (416) through a second synchronous belt, the second rocker (412) is connected with the first rocker (411) through a connecting rod (413), and a label suction plate (417) is connected between the first connecting rod (413) in the second connecting rod module (42) and the connecting rod (413) in the first connecting rod module (41).

7. The automatic label defect screening equipment according to claim 6, wherein the screening mechanism (3) comprises a mounting frame (31) and a label recycling cylinder (32), the position of the label recycling cylinder (32) is matched with the stroke end position of the label suction plate (417), a label placing plate (35) for covering the recycling port of the label recycling cylinder is arranged above the label recycling cylinder (32), a positioning mounting plate (33) is arranged above the mounting frame (31), a horizontal sliding unit (34) is arranged above the positioning mounting plate (33), the label placing plate (35) is connected with the horizontal sliding unit (34), and the label placing plate (35) is driven by the horizontal sliding unit (34) to move back and forth along the horizontal direction to realize the opening and closing state of the label recycling cylinder.

8. The automatic label defect screening apparatus according to claim 7, wherein the screening mechanism (3) further comprises a third link module (36) and a packer (37), wherein the structure of the third link module (36) is consistent with that of the first link module (41), the packer (37) is disposed on one side of the label recovery cylinder (32), a label shaping position (38) is disposed in the packer (37), and the label shaping position (38) and the label recovery cylinder (32) are disposed at the end and beginning of the movement path of the label suction plate (417) in the third link module (36).

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