Degradable self-adhesive label color difference detection device

Abstract

The invention belongs to the technical field of non-setting adhesive label color difference detection, and particularly relates to a degradable non-setting adhesive label color difference detection device which comprises a base, the upper side wall of the base is fixedly connected with a supporting cover, the upper side wall of the supporting cover is fixedly connected with a top plate, and the lower side wall of the top plate is fixedly connected with a lead screw linear module. When the color difference of the self-adhesive label is detected by using the colorimeter, the tail end of the label belt is fixed by negative pressure, and stable and uniform tension constraint is provided for the tail end of the label separated from the winding drum through negative pressure adsorption force, so that edge warping caused by material memorability can be counteracted, and the color difference of the self-adhesive label is detected. It is ensured that the surface of the label is always attached to the detection platform and keeps a constant geometric angle with a lens of a colorimeter, color channel value deviation caused by change of reflection characteristics is avoided, large-amplitude left-right deviation in the label conveying process can be limited, and it is ensured that an ROI of optical sampling is accurately aligned with the position of a target color code.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of color difference detection of self-adhesive labels, and particularly relates to a device for color difference detection of degradable self-adhesive labels. BACKGROUND

[0002] Compared with traditional labels, self-adhesive labels have the advantages of no need to brush glue, no need to use paste, no need to dip water, no pollution, and time saving in label sticking, and thus are widely applied and convenient. Self-adhesive label is a material, also called self-adhesive label material, which is a composite material with paper, film or other special materials as surface material, adhesive coated on the back, and silicon-coated protective paper as bottom paper. After printing and die cutting, the self-adhesive label becomes a finished product. In order to ensure the color consistency and compliance of the label, meet the production quality control and brand visual uniformity, color difference detection is needed. For example, a device for color difference detection of self-adhesive labels is provided in patent publication No. CN119715389A.

[0003] When the existing device detects color difference, the wound self-adhesive label is spread and conveyed for detection under the colorimeter. When the end of the self-adhesive label strip is separated from the winding roller, the tension constraint is lost, the label edge is warped due to material memory, and the label is easily deviated left and right during the conveying process. The large left and right deviation of the label will make the ROI (region of interest) of the colorimeter deviate from the preset color standard position, and the collected pixels may be mixed into the blank area, adhesive layer area or non-standard pattern area of the label edge. The edge warping will make the label partially deviate from the detection platform plane. If the ROI covers the warped edge, it will contain both the "hanging label edge" and the "label main body adhered to the platform", causing the collected color information to be mixed, which directly leads to false positive color difference determination.

[0004] Therefore, a device for color difference detection of degradable self-adhesive labels is provided to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a device for color difference detection of degradable self-adhesive labels to solve the above problems.

[0006] To achieve the above purpose, the following technical scheme is adopted: a device for color difference detection of degradable self-adhesive labels, comprising a base, a support cover fixedly connected to the upper side wall of the base, a top plate fixedly connected to the upper side wall of the support cover, a lead screw linear module fixedly connected to the lower side wall of the top plate, a colorimeter fixedly connected to the moving end of the lead screw linear module, a controller fixedly connected to the side wall of the base, and the colorimeter and the controller being electrically connected, further comprising:

[0007] The conveying assembly is arranged inside the base, and the adhesive labels are conveyed to the lower side of the colorimeter through the conveying assembly, and the color difference of the adhesive labels is detected by the colorimeter;

[0008] The negative pressure adsorption assembly is arranged on the upper side wall of the base and located directly below the colorimeter, the conveying assembly passes through the upper side of the negative pressure adsorption assembly, and the end of the adhesive label is adsorbed and limited by the negative pressure adsorption assembly;

[0009] The lens dust removal assembly is arranged on the side wall of the support cover, and the dust is cleaned by the air flow gradually diffused from the middle of the lens of the colorimeter to the periphery, so that the risk of scratching the lens of the colorimeter is minimized.

[0010] In the above-mentioned degradable adhesive label color difference detection device, the conveying assembly includes a receiving cavity and a mounting cavity opened in the inside of the base, the inner wall of the receiving cavity is connected with a receiving roller, the inner wall of the mounting cavity is connected with a feeding roller, the receiving roller and the feeding roller are drivingly connected with an external power source, the upper side walls of the receiving cavity and the mounting cavity are both provided with a feeding port, the adhesive label tape on the surface of the feeding roller is wound on the surface of the receiving roller through the two feeding ports, and the mounting cavity is provided with a label adhesive dust removal assembly.

[0011] In the above-mentioned degradable adhesive label color difference detection device, the label adhesive dust removal assembly includes a dust removal box and a first air pump, the dust removal box is fixedly connected with the inner wall of the mounting cavity through a support frame and is located in the mounting cavity, the first air pump is fixedly connected to one side of the dust removal box close to the support frame, the air suction end of the first air pump is communicated with the dust removal box, the inside of the dust removal box is provided with a filter element located at the air suction end of the first air pump, the side wall of the dust removal box away from the support frame is close to the adhesive label and is connected with a plurality of brush hairs, and the side wall of the dust removal box close to the adhesive label is provided with a plurality of dust suction square ports, and the plurality of brush hairs and the plurality of dust suction square ports are alternately arranged.

[0012] In the above-mentioned degradable adhesive label color difference detection device, the negative pressure adsorption assembly includes a second air pump and a cross pipe, the inside of the base is provided with a placement cavity, the placement cavity is located between the two feeding ports, the second air pump is installed in the placement cavity, the air suction end of the second air pump is communicated with the cross pipe, the upper side wall of the cross pipe is fixedly communicated with a plurality of short pipes, the short pipes are provided with electromagnetic valves and air speed sensors, the electromagnetic valves and the air speed sensors are electrically connected with a controller, the upper ends of the plurality of short pipes are fixedly communicated with longitudinally placed air suction pipes, the upper ends of the air suction pipes are fixedly communicated with a plurality of longitudinally distributed negative pressure pipes, the upper side wall of the base is fixedly connected with a support table, and the upper ends of the negative pressure pipes are communicated with the upper surface of the support table.

[0013] In the above-mentioned device for detecting chromatic aberration of degradable adhesive labels, the lens dust removal assembly comprises a small electric push rod and a dust removal cover, the fixed end of the small electric push rod is fixedly connected with a support plate, the support plate and the inner wall of the support cover are fixedly connected, the moving end of the small electric push rod is fixedly connected with the lower side wall of the dust removal cover, the lower inner wall of the dust removal cover is fixedly connected with a fixed frame, the side wall of the fixed frame is rotatably connected with a rotating pipe, the lower inner wall of the dust removal cover is fixedly connected with a driving motor, the output end of the driving motor is drivingly connected with the rotating pipe through a gear ring transmission assembly, the upper end of the rotating pipe is fixedly connected with a blowing pipe, a plurality of electrically-controlled blowing heads are horizontally distributed on the upper side wall of the blowing pipe, the upper side wall of the dust removal cover is fixedly connected with a sealing ring, the lens of the colorimeter is inserted into the sealing ring, the sealing ring is a hollow structure, the outer wall of the dust removal cover is connected with a third air suction pump through a support, the air outlet end of the third air suction pump penetrates through the dust removal cover and is rotatably connected with the lower end of the rotating pipe through a bearing, the side wall of the dust removal cover is fixedly connected with a dust collection box, the same bend pipe is connected between the dust collection box and the sealing ring, the air inlet end of the third air suction pump is in communication with the side wall of the dust collection box, the inner wall of the dust collection box is connected with a filter element located at the air inlet end of the third air suction pump, and a plurality of dust suction holes are formed in the inner wall of the sealing ring.

[0014] In the above-mentioned device for detecting chromatic aberration of degradable adhesive labels, the inner wall of the mounting cavity is fixedly connected with a heating plate through a support, and the heating plate is close to the adhesive label.

[0015] In the above-mentioned device for detecting chromatic aberration of degradable adhesive labels, the front side wall of the support cover is hingedly connected with a transparent protective door, and the front side wall of the base is hingedly connected with a sealing door located in front of the storage cavity and the mounting cavity.

[0016] In the above-mentioned device for detecting chromatic aberration of degradable adhesive labels, the side wall of each of the two feeding ports is connected with a guide roller, the lower inner wall of the mounting cavity is fixedly connected with a tensioning electric push rod, and the moving end of the tensioning electric push rod is connected with a tensioning roller through a tension sensor.

[0017] Compared with the prior art, the device for detecting chromatic aberration of degradable adhesive labels has the following advantages:

[0018] 1. By using the set conveying components and negative pressure adsorption components, when using a colorimeter to detect color difference in self-adhesive labels, the end of the label tape is fixed by negative pressure. The negative pressure adsorption force provides a stable and uniform tension constraint for the end of the label that is detached from the roll. This not only counteracts edge warping caused by material memory, ensuring that the label surface always adheres to the detection platform and maintains a constant geometric angle with the colorimeter lens, avoiding color channel value shifts caused by changes in reflective properties, but also limits large left and right offsets during label conveying, ensuring that the ROI area of ​​optical sampling is accurately aligned with the target color mark position, preventing false color difference misjudgments caused by sampling area distortion. At the same time, it can also suppress movement speed fluctuations caused by sudden tension changes in the label, improve the repeatability and consistency of the detection data, and ultimately ensure the accuracy and reliability of the end label color difference detection results.

[0019] 2. With the lens dust removal component in place, after the colorimeter finishes working, a dust removal process is carried out by blowing air from the center of the colorimeter lens outwards. This radial and uniform airflow pushes dust particles on the lens surface unidirectionally to the edge and removes them, preventing dust from accumulating in the center and scratching the delicate optical coating. At the same time, it prevents the airflow from blowing hidden dust in the edge gaps into the effective detection area of ​​the lens, causing secondary pollution. This ensures stable lens transmittance and maintains the accuracy and reliability of the colorimeter's color difference detection.

[0020] 3. By using the label adhesive dust removal component, the obstruction, scattering, and absorption of the detection light source by dust particles can be eliminated before using a colorimeter to detect the color difference of self-adhesive labels. This avoids distortion of the reflection angle and deviation of color channel values ​​caused by dust, ensuring that the optical sampling area only collects the true color information of the label itself, preventing false color difference misjudgments caused by dust interference, and reducing the risk of dust contamination of the colorimeter lens, thus ensuring the accuracy, repeatability, and stability of the detection data. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a biodegradable self-adhesive label color difference detection device provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the conveying component in a biodegradable self-adhesive label color difference detection device provided by the present invention;

[0023] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle;

[0024] Figure 4 This is a schematic diagram showing the positional relationship between the negative pressure tube and the support platform in a biodegradable self-adhesive label color difference detection device provided by the present invention.

[0025] Figure 5This is a schematic diagram of the negative pressure adsorption component in a biodegradable self-adhesive label color difference detection device provided by the present invention.

[0026] Figure 6 This is a schematic diagram of the surface structure of the dust collection box in a device for detecting color difference of biodegradable self-adhesive labels provided by the present invention.

[0027] Figure 7 This is a schematic diagram of the lens dust removal component in a biodegradable self-adhesive label color difference detection device provided by the present invention.

[0028] Figure 8 yes Figure 7 Enlarged diagram of part B.

[0029] In the diagram: 1. Base, 2. Support cover, 3. Top plate, 4. Lead screw linear module, 5. Colorimeter, 6. Controller, 7. Conveying assembly, 71. Storage cavity, 72. Mounting cavity, 8. Storage roller, 9. Feeding roller, 10. Feeding port, 11. Label adhesive dust removal assembly, 111. Dust collection box, 112. First suction pump, 12. Brush bristles, 13. Dust suction square nozzle, 14. Negative pressure adsorption assembly, 141. Second suction pump, 142. Horizontal pipe, 15. Placement cavity, 16. Short pipe, 17. Solenoid valve, 18. Wind speed sensor 19. Suction pipe, 20. Negative pressure pipe, 21. Support platform, 22. Lens dust removal assembly, 221. Small electric push rod, 222. Dust removal hood, 23. Support plate, 24. Fixing bracket, 25. Rotary pipe, 26. Drive motor, 27. Air blowing pipe, 28. Electrically controlled air blowing head, 29. Sealing ring, 30. Third suction pump, 31. Dust collection box, 32. Bend, 33. Dust suction hole, 34. Heating plate, 35. Transparent protective door, 36. Sealing door, 37. Guide roller, 38. Tensioning electric push rod, 39. Tensioning roller. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] like Figures 1-8 As shown, a device for detecting color difference in biodegradable self-adhesive labels includes a base 1, a support cover 2 fixedly connected to the upper side wall of the base 1, a transparent protective door 35 hinged to the front side wall of the support cover 2, a top plate 3 fixedly connected to the upper side wall of the support cover 2, a lead screw linear module 4 fixedly connected to the lower side wall of the top plate 3, a colorimeter 5 fixedly connected to the moving end of the lead screw linear module 4, a controller 6 fixedly connected to the side wall of the base 1, and the colorimeter 5 and the controller 6 electrically connected. The device also includes:

[0032] The conveying assembly 7 is located inside the base 1. The conveying assembly 7 includes a receiving cavity 71 and an mounting cavity 72 formed inside the base 1. A sealing door 36 is hinged to the front wall of the base 1, located in front of the receiving cavity 71 and the mounting cavity 72. A heating plate 34 is fixedly connected to the inner wall of the mounting cavity 72 via a bracket, and the heating plate 34 is close to the self-adhesive label. A receiving roller 8 is connected to the inner wall of the receiving cavity 71, and a feeding roller 9 is connected to the inner wall of the mounting cavity 72. Both the receiving roller 8 and the feeding roller 9 are connected to an external power source. Feeding ports 10 are formed on the upper side walls of both the receiving cavity 71 and the mounting cavity 72. Guide rollers 37 are connected to the side walls of both feeding ports 10. A tensioning electric push rod 38 is fixedly connected to the lower inner wall of the mounting cavity 72. The moving end of the tensioning electric push rod 38 is connected to a tensioning roller 39 via a tension sensor. The self-adhesive label tape on the surface of the feeding roller 9 is wound around the receiving roller through the two feeding ports 10. On the surface of 8, a label adhesive dust removal assembly 11 is provided in the mounting cavity 72. The self-adhesive label is conveyed to the bottom of the colorimeter 5 through the conveying assembly 7. The colorimeter 5 is used to detect the color difference of the self-adhesive label. The label adhesive dust removal assembly 11 includes a dust removal box 111 and a first suction pump 112. The dust removal box 111 is located in the mounting cavity 72 and is fixedly connected to the inner wall of the mounting cavity 72 through a support frame. The first suction pump 112 is fixedly connected to the side of the dust removal box 111 near the support frame. The suction end of the first suction pump 112 is connected to the dust removal box 111. The dust removal box 111 is provided with a filter element located at the suction end of the first suction pump 112. The side wall of the dust removal box 111 away from the support frame is close to the self-adhesive label and is connected to multiple sets of bristles 12. Multiple suction ports 13 are opened on the side wall of the dust removal box 111 near the self-adhesive label. Multiple sets of bristles 12 and multiple suction ports 13 are arranged alternately.

[0033] The negative pressure adsorption component 14 is disposed on the upper side wall of the base 1 and located directly below the colorimeter 5. The conveying component 7 passes the self-adhesive label over the negative pressure adsorption component 14. The negative pressure adsorption component 14 includes a second suction pump 141 and a horizontal pipe 142. A placement cavity 15 is provided inside the base 1, located between two feeding ports 10. The second suction pump 141 is installed in the placement cavity 15, and the suction end of the second suction pump 141 is connected to the horizontal pipe 142. The upper wall of the horizontal pipe 142 is fixedly connected to... Multiple short tubes 16 are provided, each containing a solenoid valve 17 and a wind speed sensor 18. Both the solenoid valve 17 and the wind speed sensor 18 are electrically connected to the controller 6. The upper ends of the multiple short tubes 16 are all fixedly connected to a longitudinally placed suction pipe 19. The upper ends of the suction pipes 19 are fixedly connected to multiple longitudinally distributed negative pressure pipes 20. A support platform 21 is fixedly connected to the upper side wall of the base 1. The upper ends of the negative pressure pipes 20 are connected to the upper surface of the support platform 21. The negative pressure adsorption component 14 adsorbs and limits the end of the self-adhesive label.

[0034] The lens dust removal assembly 22 is installed on the side wall of the support cover 2. It uses airflow to gradually diffuse from the center of the colorimeter 5 lens outwards to remove dust, minimizing the risk of scratching the colorimeter 5 lens. The lens dust removal assembly 22 includes a small electric push rod 221 and a dust removal cover 222. The fixed end of the small electric push rod 221 is fixedly connected to a support plate 23, which is fixedly connected to the inner wall of the support cover 2. The moving end of the small electric push rod 221 is fixedly connected to the lower side wall of the dust removal cover 222. A fixing frame 24 is fixedly connected to the lower inner wall of the dust removal cover 222. A rotating tube 25 is rotatably connected to the side wall of the fixing frame 24. A drive motor 26 is fixedly connected to the lower inner wall of the dust removal cover 222. The output end of the drive motor 26 is connected to the rotating tube 25 through a gear ring transmission assembly. The upper end of the dust collector 222 is fixedly connected to an air blowing pipe 27. Multiple electrically controlled air blowing heads 28 are distributed laterally on the upper side wall of the air blowing pipe 27. A sealing ring 29 is fixedly connected to the upper side wall of the dust collector 222. The lens of the colorimeter 5 is inserted into the sealing ring 29. The sealing ring 29 has a hollow structure. The outer wall of the dust collector 222 is connected to a third suction pump 30 through a bracket. The air outlet of the third suction pump 30 passes through the dust collector 222 and is rotatably connected to the lower end of the rotating pipe 25 through a bearing. The side wall of the dust collector 222 is fixedly connected to a dust collection box 31. The dust collection box 31 and the sealing ring 29 are connected by the same bent pipe 32. The air inlet of the third suction pump 30 is connected to the side wall of the dust collection box 31. The inner wall of the dust collection box 31 is connected to a filter element located at the air inlet of the third suction pump 30. Multiple dust suction holes 33 are opened on the inner wall of the sealing ring 29.

[0035] The operating principle of the present invention is explained as follows: The feeding roller 9, which is wrapped with biodegradable self-adhesive label tape, is installed in the working end of the external power source (the external power source is a drive motor) in the mounting cavity 72. Then, the operator pulls the front end of the self-adhesive label tape through the feeding port 10 and wraps it around the surface of the receiving roller 8 (the front end surface pulled manually does not have a self-adhesive label pasted on it). The front end of the self-adhesive label tape will pass through the tension roller 39 and pass through the two guide rollers 37. After the front end of the self-adhesive label tape is fixed on the surface of the receiving roller 8, the operator closes the transparent protective door 35 and the two sealing doors 36, and sends an electrical signal to the controller 6 through the external touch screen.

[0036] After receiving the electrical signal, controller 6 first controls the tensioning electric push rod 38 to operate. The tensioning electric push rod 38 drives the tensioning roller 39 to move downwards via a tension sensor (the tension sensor is not shown in the diagram). The tensioning roller 39 applies pressure to the self-adhesive label tape. When controller 6 detects through the tension sensor that the pressure between the tensioning roller 39 and the self-adhesive label tape reaches the set threshold (10N), controller 6 controls the tensioning electric push rod 38 to stop operating. Then, controller 6 controls an external power source to drive the feeding roller 9 and the receiving roller 8 to rotate, conveying the self-adhesive label wrapped on the surface of the feeding roller 9 to the receiving roller 8. The label will pass over the support platform 21 and directly below the colorimeter 5. While controlling the external power source, the controller 6 will also control the second air pump 141 to work at a low power (0.5kW). The second air pump 141 draws external gas through the horizontal pipe 142, the air extraction pipe 19 and the negative pressure pipe 20. When the self-adhesive label moves to the surface of the support platform 21, under the action of negative pressure, the self-adhesive label will stick tightly to the surface of the support platform 21, so that the self-adhesive label on the surface of the support platform 21 moves in a completely flat state, so that the distance between the self-adhesive label and the colorimeter 5 remains fixed, thereby improving the accuracy of the colorimeter 5 detection.

[0037] When the end of the self-adhesive label detaches from the feeding roller 9, the tension between the tension roller 39 and the self-adhesive label will drop rapidly. After the controller 6 detects this situation through the tension sensor, it will increase the power of the second suction pump 141, making the second suction pump 141 work at a power of 1.5kW. At the same time, the controller 6 will also control the heating plate 34 to work, using the heating plate 34 to heat the end of the self-adhesive label, accelerating the release of label stress. When the end of the self-adhesive label passes over the surface of the support table 21, it will move in a relatively flat state under the action of a large adsorption force, avoiding the problem that the end of the self-adhesive label loses tension constraint, causing edge warping and displacement, which would affect the detection accuracy of the colorimeter 5.

[0038] After the colorimeter 5 finishes its work, the controller 6 controls the lead screw linear module 4 to move the colorimeter 5 closer to the dust hood 222, positioning it directly above the dust hood 222. Next, the controller 6 controls the small electric push rod 221, which moves the dust hood 222 and the sealing ring 29 upwards to a set position, covering the outside of the colorimeter 5 lens. Then, the controller 6 controls the third suction pump 30 and the drive motor 26 to operate. The drive motor 26 drives the rotating tube 25 to rotate via a gear and ring drive assembly (the gear and ring drive assembly includes a drive gear connected to the output end of the drive motor 26 and a drive ring fitted on the outside of the rotating tube 25; the drive motor 26 rotates via the meshing belt of the drive gear and the drive ring). The rotating tube 25 rotates, and the outlet of the third suction pump 30 delivers gas to the rotating tube 25, which is then delivered to the innermost electrically controlled air blowing head 28 through the air blowing pipe 27. The controller 6 controls multiple electrically controlled air blowing heads 28 to open sequentially, and the dust cleaning process is carried out by blowing air from the center of the colorimeter 5 lens outwards. This can push the dust particles on the lens surface to the edge and remove them through a radial and uniform airflow, avoiding dust accumulation towards the center and scratching the fragile optical coating. At the same time, it prevents the airflow from blowing hidden dust in the edge gaps to the effective detection area of ​​the lens, causing secondary pollution. When the third suction pump 30 is working, it will extract the gas inside the dust collection box 31. Under negative pressure, the gas inside the sealing ring 29 will carry the dust through the suction hole 33 and the bent pipe 32 into the dust collection box 31 for storage.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting color difference of biodegradable self-adhesive labels, comprising a base (1), a support cover (2) fixedly connected to the upper side wall of the base (1), a top plate (3) fixedly connected to the upper side wall of the support cover (2), a lead screw linear module (4) fixedly connected to the lower side wall of the top plate (3), a colorimeter (5) fixedly connected to the moving end of the lead screw linear module (4), a controller (6) fixedly connected to the side wall of the base (1), and the colorimeter (5) and the controller (6) being electrically connected, characterized in that, Also includes: The conveying assembly (7) is located inside the base (1). The self-adhesive label is conveyed to the bottom of the colorimeter (5) through the conveying assembly (7), and the colorimeter (5) is used to detect the color difference of the self-adhesive label. The negative pressure adsorption component (14) is set on the upper side wall of the base (1) and located directly below the colorimeter (5). The conveying component (7) passes the self-adhesive label over the negative pressure adsorption component (14) and adsorbs and limits the end of the self-adhesive label through the negative pressure adsorption component (14). The lens dust removal assembly (22) is set on the side wall of the support cover (2). It uses airflow to gradually diffuse from the center of the colorimeter (5) lens to the surrounding area to clean the dust, thereby minimizing the risk of scratching the colorimeter (5) lens.

2. The device for detecting color difference of biodegradable self-adhesive labels according to claim 1, characterized in that, The conveying assembly (7) includes a receiving cavity (71) and an mounting cavity (72) inside the base (1). The inner wall of the receiving cavity (71) is connected to a receiving roller (8), and the inner wall of the mounting cavity (72) is connected to a feeding roller (9). Both the receiving roller (8) and the feeding roller (9) are connected to an external power source. The upper sidewalls of the receiving cavity (71) and the mounting cavity (72) are provided with feeding ports (10). The self-adhesive label tape on the surface of the feeding roller (9) is wrapped around the surface of the receiving roller (8) through the two feeding ports (10). The mounting cavity (72) is provided with a label adhesive dust removal assembly (11).

3. The device for detecting color difference of biodegradable self-adhesive labels according to claim 2, characterized in that, The label adhesive dust removal assembly (11) includes a dust removal box (111) and a first suction pump (112). The dust removal box (111) is located in the mounting cavity (72) and is fixedly connected to the inner wall of the mounting cavity (72) through a support frame. The first suction pump (112) is fixedly connected to the side of the dust removal box (111) near the support frame. The suction end of the first suction pump (112) is connected to the dust removal box (111). The dust removal box (111) is equipped with a filter element located at the suction end of the first suction pump (112). The side wall of the dust removal box (111) away from the support frame is close to the self-adhesive label and is connected to multiple sets of bristles (12). Multiple suction ports (13) are opened on the side wall of the dust removal box (111) near the self-adhesive label. The multiple sets of bristles (12) and multiple suction ports (13) are arranged alternately.

4. The device for detecting color difference of biodegradable self-adhesive labels according to claim 1, characterized in that, The negative pressure adsorption assembly (14) includes a second suction pump (141) and a horizontal tube (142). The base (1) has a placement cavity (15) inside, which is located between two feeding ports (10). The second suction pump (141) is installed in the placement cavity (15). The suction end of the second suction pump (141) is connected to the horizontal tube (142). The upper wall of the horizontal tube (142) is fixedly connected to multiple short tubes (16). The short tubes (16) are equipped with... There is a solenoid valve (17) and a wind speed sensor (18). The solenoid valve (17) and the wind speed sensor (18) are electrically connected to the controller (6). The upper ends of the multiple short pipes (16) are fixedly connected to a longitudinally placed suction pipe (19). The upper end of the suction pipe (19) is fixedly connected to multiple longitudinally distributed negative pressure pipes (20). The upper side wall of the base (1) is fixedly connected to a support platform (21). The upper end of the negative pressure pipe (20) is connected to the upper surface of the support platform (21).

5. The device for detecting color difference of biodegradable self-adhesive labels according to claim 1, characterized in that, The lens dust removal assembly (22) includes a small electric push rod (221) and a dust removal hood (222). The fixed end of the small electric push rod (221) is fixedly connected to a support plate (23). The support plate (23) is fixedly connected to the inner wall of the support hood (2). The moving end of the small electric push rod (221) is fixedly connected to the lower side wall of the dust removal hood (222). A fixing frame (24) is fixedly connected to the lower inner wall of the dust removal hood (222). A rotating tube (25) is rotatably connected to the side wall of the fixing frame (24). A drive motor (26) is fixedly connected to the lower inner wall of the dust removal hood (222). The output end of the drive motor (26) is connected to the rotating tube (25) through a gear ring transmission assembly. An air blowing pipe (27) is fixedly connected to the upper end of the rotating tube (25). Multiple electrically controlled air blowing heads are distributed laterally on the upper side wall of the air blowing pipe (27). 28), a sealing ring (29) is fixedly connected to the upper side wall of the dust removal hood (222), the lens of the colorimeter (5) is inserted into the sealing ring (29), the sealing ring (29) is a hollow structure, the outer wall of the dust removal hood (222) is connected to a third suction pump (30) through a bracket, the outlet end of the third suction pump (30) passes through the dust removal hood (222) and is rotatably connected through the bearing and the lower port of the rotating tube (25), the side wall of the dust removal hood (222) is fixedly connected to a dust collection box (31), the dust collection box (31) and the sealing ring (29) are connected by the same bent pipe (32), the inlet end of the third suction pump (30) is connected to the side wall of the dust collection box (31), the inner wall of the dust collection box (31) is connected to a filter element located at the inlet end of the third suction pump (30), and the inner wall of the sealing ring (29) is provided with multiple dust suction holes (33).

6. The device for detecting color difference of biodegradable self-adhesive labels according to claim 2, characterized in that, A heating plate (34) is fixedly connected to the inner wall of the mounting cavity (72) by a bracket, and the heating plate (34) is close to the self-adhesive label.

7. The device for detecting color difference of biodegradable self-adhesive labels according to claim 2, characterized in that, The front side wall of the support cover (2) is hinged with a transparent protective door (35), and the front side wall of the base (1) is hinged with a sealing door (36) located in front of the storage cavity (71) and the mounting cavity (72).

8. The device for detecting color difference of biodegradable self-adhesive labels according to claim 2, characterized in that, Guide rollers (37) are connected to the side walls of both feed ports (10), and a tensioning electric push rod (38) is fixedly connected to the lower inner wall of the mounting cavity (72). The moving end of the tensioning electric push rod (38) is connected to a tensioning roller (39) through a tension sensor.

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