An automatic cleaning device and detection method for cigarette detection of a packaging machine

Abstract

The application discloses an automatic cleaning device for cigarette detection of a packaging machine, which comprises a first cigarette detection plate (1), a cigarette imaging detector (2), a cigarette detection plate positioning shaft (3), a first cigarette detection plate positioning block (4), a positioning stop ring (5), a gas pipe adapter (6) and a gas pipe (7). The first cigarette detection plate is arranged at the filter side of a cigarette mold box. The first cigarette detection plate positioning block and the positioning stop ring are respectively arranged on the two side surfaces of the first cigarette detection plate and the positioning shaft. The gas pipe adapter is arranged at one end of the positioning shaft. The first cigarette detection plate is internally provided with a gas hole channel and a gas outlet nozzle. The application can effectively reduce the frequency of foreign matters such as cigarette foam and dust adhering to the detection window, avoid the cost consumption caused by the false rejection of cigarettes, and shorten the cleaning time of manual maintenance of the cigarette imaging detector.

Description

Technical Field

[0001] This invention relates to the field of cigarette manufacturing and processing equipment technology, specifically to an automatic cleaning device and detection method for cigarette detection in packaging machines. Background Technology

[0002] During the cigarette wrapping and forming process, cigarettes inside the cigarette mold often accumulate tobacco dust and ash in the conveying channel due to contact with mechanical structures such as the sides of the conveying channel or the cigarette pusher plate. In actual production, during the cigarette's descent and conveying process, the rubbing, squeezing, and agitation of the cigarettes by the moving parts and the stirring rollers cause tobacco shreds at the cigarette ends to fall into the conveying channel. This tobacco dust and ash adhere to the surface of the cigarette imaging detector during transport, leading to misjudgment and rejection of cigarette groups from the normal workstation mold, resulting in the loss of qualified cigarettes and severely impacting the production costs of raw materials in cigarette manufacturing.

[0003] To address the aforementioned technical problems in cigarette detection, this invention aims to change the structure of the cigarette conveying mold and the detection method, thereby reducing the frequency of tobacco dust adhering to the surface of the cigarette imaging detector, reducing the rejection of qualified cigarettes due to malfunctions of the cigarette imaging detector, shortening the cleaning time for manual maintenance of the detector surface, and effectively reducing cost waste caused by erroneous cigarette rejection. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an automatic cleaning device and detection method for cigarette detection in packaging machines. This invention aims to solve the problem that existing cigarette imaging detectors sometimes misjudge cigarette groups as containing substandard cigarettes due to the adhesion of tobacco dust and ash generated in the cigarette conveying channel, leading to rejection actions. This avoids the cost of incorrect cigarette rejection. Simultaneously, it reduces the frequency of tobacco dust and other foreign matter adhering to the detection window, effectively shortening the cleaning time for manual maintenance of the cigarette imaging detector. Furthermore, by optimizing the detection method, it increases the ability to classify substandard cigarette groups, reducing rejection actions at the cigarette filter due to tobacco dust adhesion, and further avoiding unnecessary cigarette production cost losses from the perspective of the detection algorithm.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An automatic cleaning device for cigarette detection in a packaging machine includes a first cigarette detection plate (1), a second cigarette detection plate (11), a cigarette imaging detector (2), a support plate (21), a cigarette detection plate positioning shaft (3), a first cigarette detection plate positioning block (4), a second cigarette detection plate positioning block (41), a positioning retaining ring (5), an air pipe adapter (6), and an air pipe (7); characterized in that: the first cigarette detection plate is disposed on the filter side of the cigarette mold box, and a support plate is disposed on the outer side of the first cigarette detection plate, the support plate... A cigarette imaging detector is installed on the plate. The first cigarette detection plate and the second cigarette detection plate are arranged in parallel and installed on the positioning shaft. The positioning shaft and the two sides of the first cigarette detection plate are respectively installed with the first cigarette detection plate positioning block and the positioning retaining ring. The positioning shaft and the two sides of the second cigarette detection plate are respectively provided with the shaft shoulder and the second cigarette detection plate positioning block. One end of the positioning shaft is equipped with a gas pipe adapter, and a gas pipe is connected to the gas pipe adapter. The first cigarette detection plate has an air hole channel (103) and an air outlet nozzle (104).

[0007] Furthermore, the first cigarette detection plate (1) near the filter tip of the cigarette mold box has an air inlet (102), an air channel (103), and an air outlet (104) inside. One end of the first cigarette detection plate has a first mounting hole. The air inlet is connected to the first mounting hole. The air inlet delivers compressed gas to the air outlet through the air channel. The air outlet faces the cigarette imaging detector and is located above the cigarette imaging detector. The air outlet angle of the air outlet is set at an acute angle with the detection surface of the cigarette imaging detector.

[0008] Furthermore, the first cigarette detection plate and the second cigarette detection plate are mounted on the positioning shaft through the first mounting hole. The first cigarette detection plate and the second cigarette detection plate are symmetrically and parallelly arranged on the front and rear sides of the cigarette mold box. The positioning shaft has a first air hole (301) and a second air hole (302). The first mounting hole of the first cigarette detection plate is connected to the first air hole of the positioning shaft. A stepped second air hole is opened inside one end of the positioning shaft, and a shaft shoulder (303) is provided on the outer surface of the other end. The air inlet end of the second air hole is provided with an internal thread. The air pipe adapter is connected to the positioning shaft through the internal thread. The other end of the air pipe adapter is connected to an air pipe. The other end of the air pipe is connected to a flow valve, a solenoid valve, and a compressed air source in sequence. The solenoid valve is electrically connected to a relay, and the relay is electrically connected to the main controller of the equipment. The flow valve is used to adjust the injection flow rate and speed of the compressed gas, wherein the gas pressure adjustment range is between 0.2MPa and 0.7MPa. At the same time, the first cigarette detection plate is made of 3D printed ABS material.

[0009] Furthermore, one end of the positioning block of the first cigarette detection plate is mounted on the positioning shaft by a clamp structure, and the other end is connected to one side of the first cigarette detection plate by a screw; one end of the positioning block of the second cigarette detection plate is mounted on the positioning shaft by a clamp structure, and the other end is connected to one side of the second cigarette detection plate by a screw; the first cigarette detection plate is mounted on the positioning shaft by the positioning block and the positioning retaining ring respectively, and the axial installation position of the first cigarette detection plate (1) along the positioning shaft (3) is adjustable, and the installation position of the corresponding exhaust nozzle 9104 is adjustable; the positioning retaining ring is mounted on the positioning shaft by a screw.

[0010] Furthermore, multiple air outlet nozzles are provided on the lower side of the first cigarette detection plate. The air outlet nozzles are evenly arranged on the lower side of the first cigarette detection plate at a spacing of 3-4 cm. The air outlet angle of the air outlet nozzles and the detection surface of the cigarette imaging detector are set within the range of 30-60°. By adjusting the air outlet angle of the air outlet nozzles and the detection surface of the cigarette imaging detector, and by adjusting the axial installation position of the first cigarette detection plate along the positioning axis, the sweeping angle and jet force of the compressed air at the air outlet nozzles can be effectively improved.

[0011] Furthermore, the diameter of the exhaust nozzle (104) is set to 3.5mm-6.5mm, the diameter of the air passage is set to 4.5mm-5.5mm, the diameter of the first air hole of the positioning shaft is 2.5mm larger than the diameter of the air inlet hole, and the inner diameter of the stepped second air hole inside the positioning shaft is 3mm smaller than the diameter of the internal thread hole. When installing the positioning 3, the positions of the first air hole and the air inlet hole of the positioning shaft need to be aligned. The first cigarette detection plate is guided along the axial direction of the positioning shaft and the positions of the first air hole and the air inlet hole are positioned by the structure of the positioning guide protrusion and the positioning guide groove.

[0012] Furthermore, multiple first air holes (301) are provided along the axial direction on the positioning shaft (3). After selecting a certain first air hole as the specific installation position, the other first air holes are sealed by plugging.

[0013] A detection method for an automatic cleaning device used for cigarette detection in a packaging machine, comprising the following steps:

[0014] Step S1: After the cigarette imaging detector takes an image of the filter side inside the cigarette mold box, it transmits it to the controller. The controller performs shape detection and color detection. If irregularly shaped debris is found in the detection image of the filter side and the debris is not white, it is determined that such debris is tobacco dust or tobacco shreds, and proceeds to step S2. If there is no irregularly shaped debris in the detection image and the image of the cigarette filter shows that at least one filter is missing, it is determined that the cigarette is missing a filter. The controller sends a rejection signal to the cigarette group rejection device of the equipment to empty the group of cigarettes.

[0015] Step S2: After determining that the debris is tobacco dust or tobacco shreds, the controller sends a drive signal to the relay. After receiving the drive signal, the relay activates the solenoid valve control circuit, and then the solenoid valve opens the compressed air source. The compressed air in the compressed air source enters the positioning shaft of the cigarette detection plate through the flow valve along the air pipe, and then enters the air inlet of the first cigarette detection plate through the first air hole. After that, it is sprayed from the air outlet (104) along the air hole channel to the detection surface of the cigarette imaging detector (2) to remove the debris.

[0016] Step S3: After compressed air is sprayed onto the detection surface of the cigarette imaging detector to remove debris, proceed to step S1. If irregularly shaped debris is still found in the detection image on the filter side and the debris is not white, proceed to step S2 again. At this time, the spray pressure and / or flow rate of the exhaust nozzle can be increased. Then, proceed to step S1 again. If irregularly shaped debris is still found in the detection image on the filter side and the debris is not white, the controller sends a stop signal to the main controller of the equipment to remind the operator that the cigarette imaging detector is abnormal. If no irregularly shaped debris is found in the detection image on the filter side, it is determined that the foreign matter has been removed, and the next set of cigarettes is detected.

[0017] The present invention discloses an automatic cleaning device and detection method for cigarette detection in a packaging machine. The device cleans the tobacco debris from the visual detection window of the cigarette imaging detector through the cavity structure of the first cigarette detection plate and compressed gas. At the same time, by adjusting the flow rate and / or pressure, the pressure and / or angle of the compressed gas spraying the cigarette imaging detector to sweep away the debris are increased, thereby enhancing the cleaning effect on adhesive debris and preventing debris from affecting the rejection action of the equipment's rejection device, causing qualified cigarette groups to be rejected and resulting in unnecessary cost waste.

[0018] The system employs a combination of shape and color detection. By conducting a secondary inspection to determine whether debris has been cleaned, the system categorizes the debris. For adhesive debris that is not ash or soot, the system promptly issues an alarm, reminding operators to manually clean the detection window of the cigarette image detector. The secondary inspection also verifies the cleaning effectiveness. Furthermore, the system incorporates quality defect detection for cigarette groups with missing filters, adding category identification for defective cigarette groups. The detection algorithm is optimized to prevent adhesive debris from obstructing the detection window of the cigarette image detector, which would cause the equipment to frequently operate during cigarette removal, increasing the amount of residual smoke and affecting the normal operating efficiency of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the automatic cleaning device for cigarette detection in a packaging machine according to the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of the concave sealing device for granular heated non-combustible tobacco according to the present invention.

[0021] Figure 3 This is a schematic diagram of an embodiment of the punch assembly of the present invention;

[0022] Figure 4 This is a schematic diagram of another embodiment of the punch assembly of the present invention;

[0023] Figure 5 This is a schematic diagram of another embodiment of the punch assembly of the present invention;

[0024] Figure 6 This is a schematic diagram of the detection method of the present invention.

[0025] In the figure: First cigarette detection plate 1, Second cigarette detection plate 11, Cigarette imaging detector 2, Support plate 21, Cigarette detection plate positioning shaft 3, First cigarette detection plate positioning block 4, Second cigarette detection plate positioning block 41, Positioning retaining ring 5, Air pipe adapter 6, Air pipe 7, First mounting hole 101, Air inlet 102, Air vent channel 103, Air outlet nozzle 104, First air vent 301, Second air vent 302, Shaft shoulder 303, Second mounting hole 42. Detailed Implementation

[0026] To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0027] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] like Figure 1-5As shown, an automatic cleaning device for cigarette detection in a packaging machine includes a first cigarette detection plate 1, a second cigarette detection plate 11, a cigarette imaging detector 2, a support plate 21, a cigarette detection plate positioning shaft 3, a first cigarette detection plate positioning block 4, a second cigarette detection plate positioning block 41, a positioning retaining ring 5, an air pipe adapter 6, and an air pipe 7. The device is characterized in that: the first cigarette detection plate 1 is disposed on the filter side of the cigarette mold box; a support plate 21 is disposed on the outer side of the first cigarette detection plate 1; a cigarette imaging detector 2 is mounted on the support plate 21; and the first cigarette detection plate 1 and the second cigarette detection plate 21 are connected. Two cigarette detection plates 11 are arranged in parallel and installed on the cigarette detection plate positioning shaft 3. The first cigarette detection plate positioning block 4 and the positioning retaining ring 5 are respectively installed on the cigarette detection plate positioning shaft 3 on both sides of the first cigarette detection plate 1. The second cigarette detection plate positioning block 41 and the shaft shoulder 3 are respectively provided on both sides of the second cigarette detection plate 11. One end of the cigarette detection plate positioning shaft 3 is equipped with a gas pipe adapter 6, and a gas pipe 7 is connected to the gas pipe adapter 6. The first cigarette detection plate 1 has an air hole channel 103 and an air outlet nozzle 104.

[0030] The first cigarette detection plate 1, located near the filter tip of the cigarette mold, has an air inlet 102, an air passage 103, and an air outlet 104. One end of the first cigarette detection plate 1 has a first mounting hole 101. The air inlet 102 communicates with the first mounting hole 101. The air inlet 102 can deliver compressed gas to the air outlet 104 through the air passage 103. The air outlet 104 faces the cigarette imaging detector 2 and is located above the cigarette imaging detector 2. The air outlet angle of the air outlet 104 forms an acute angle with the detection surface of the cigarette imaging detector 2. The second cigarette detection plate 11, located away from the filter tip of the cigarette mold, has the same shape as the first cigarette detection plate 1, but does not have an air outlet 104.

[0031] The first cigarette detection plate 1 and the second cigarette detection plate 11 are mounted on the positioning shaft 3 through the first mounting hole 101. The first cigarette detection plate 1 and the second cigarette detection plate 11 are symmetrically and parallelly arranged on the front and rear sides of the cigarette mold box. The positioning shaft 3 has a first air hole 301 and a second air hole 302. The first mounting hole 101 of the first cigarette detection plate 1 corresponds to and communicates with the first air hole 301 of the positioning shaft 3. A stepped second air hole 302 is opened inside one end of the positioning shaft 3, and a shaft shoulder 303 is provided on the outer surface of the other end. The air inlet end of the second air hole 302 is provided with a... The air pipe adapter 6 is connected to the positioning shaft 3 via an internal thread. The other end of the air pipe adapter 6 is connected to an air pipe 7. The other end of the air pipe 7 is sequentially connected to a flow valve, a solenoid valve, and a compressed air source. The solenoid valve is electrically connected to a relay, and the relay is electrically connected to the main controller of the equipment. The flow valve can be used to adjust the injection flow rate and speed of the compressed gas, and the gas pressure adjustment range is between 0.2MPa and 0.7MPa. At the same time, the first cigarette detection plate 1 can be made of 3D printed ABS material, which reduces the processing difficulty and improves the impurity removal effect of compressed air.

[0032] One end of the first cigarette detection plate positioning block 4 is mounted on the positioning shaft 3 via a clamp-type structure (including threaded connectors), and the other end is connected to one side of the first cigarette detection plate 1 via screws; one end of the second cigarette detection plate positioning block 41 is mounted on the positioning shaft 3 via a clamp-type structure (including threaded connectors), and the other end is connected to one side of the second cigarette detection plate 11 via screws; the first cigarette detection plate 1 is mounted on the positioning shaft 3 via the first cigarette detection plate positioning block 4 and the positioning retaining ring 5, and / or the axial installation position of the first cigarette detection plate 1 along the positioning shaft 3 is adjustable, and the installation position of the corresponding exhaust nozzle 104 is adjustable; the positioning retaining ring 5 is mounted on the positioning shaft 3 via screws.

[0033] Three air outlet nozzles 104 are provided on the lower side of the first cigarette detection plate 1. The air outlet nozzles 104 are evenly arranged on the lower side of the first cigarette detection plate 1 at a spacing of 3-4 cm. The air outlet angle of the air outlet nozzles 104 and the detection surface of the cigarette imaging detector 2 are set in the range of 30-60°. By adjusting the air outlet angle of the air outlet nozzles 104 and the detection surface of the cigarette imaging detector 2, and by adjusting the axial installation position of the first cigarette detection plate 1 along the positioning axis 3, the sweeping angle and jet force of the compressed air at the air outlet nozzles 104 can be effectively improved, thereby increasing the area range and the impurity removal effect of the compressed air sweeping.

[0034] The diameter of the exhaust nozzle 104 is set to 3.5mm-6.5mm, and the diameter of the air passage 103 is set to 4.5mm-5.5mm. The diameter of the first air hole 301 of the positioning shaft 3 is 2.5mm larger than that of the air inlet 102. The inner diameter of the stepped second air hole 302 inside the positioning shaft 3 is 3mm smaller than that of the internal thread hole. When installing the positioning shaft 3, the positions of the first air hole 301 and the air inlet 102 of the positioning shaft 3 need to be aligned. The first cigarette detection plate 1 can be guided along the axial direction of the positioning shaft 3 and the positions of the first air hole 301 and the air inlet 102 can be positioned by the structure of the positioning guide protrusion and the positioning guide groove.

[0035] In one embodiment, for the case where the axial installation position of the first cigarette detection plate 1 along the positioning shaft 3 is adjustable, a plurality of first air holes 301 are provided on the positioning shaft 3 along the axial direction. After selecting a certain first air hole 301 as the specific installation position, the other first air holes 301 are blocked by plugging.

[0036] like Figure 6 As shown, an automatic cleaning device for detecting cigarettes in a packaging machine includes the following steps:

[0037] Step S1: After the cigarette imaging detector 2 takes an image of the filter side inside the cigarette mold box, it transmits the image to the controller. The controller performs shape detection and color detection. If irregularly shaped debris is found in the detection image of the filter side and the debris is not white, it is determined that the debris is tobacco dust or tobacco shreds, and the process proceeds to step S2. If there is no irregularly shaped debris in the detection image and the image of the cigarette filter shows that at least one filter is missing, it is determined that the cigarette is missing a filter. The controller sends a rejection signal to the cigarette group rejection device of the equipment to empty the group of cigarettes.

[0038] Step S2: After determining that the debris is tobacco dust or tobacco shreds, the controller sends a drive signal to the relay. After receiving the drive signal, the relay activates the solenoid valve control circuit, and then the solenoid valve opens the compressed air source. The compressed air in the compressed air source enters the cigarette detection plate positioning shaft 3 through the flow valve along the air pipe 7, and then enters the air inlet 102 of the first cigarette detection plate 1 through the first air hole 301. After that, it is sprayed from the air outlet 104 along the air hole channel 103 to the detection surface of the cigarette imaging detector 2 to remove the debris.

[0039] Step S3: After compressed air is sprayed onto the detection surface of the cigarette imaging detector 2 to remove debris, proceed to step S1. If irregularly shaped debris is still found in the detection image on the filter side and the debris is not white, proceed to step S2 again. At this time, the spray pressure and / or flow rate of the air outlet 104 can be increased. Then, proceed to step S1 again. If irregularly shaped debris is still found in the detection image on the filter side and the debris is not white, the controller sends a stop signal to the main controller of the equipment to remind the operator that the cigarette imaging detector 2 is detecting abnormalities. If no irregularly shaped debris is found in the detection image on the filter side, it is determined that the foreign matter has been removed, and the next set of cigarettes is detected.

[0040] The present invention discloses an automatic cleaning device and detection method for cigarette detection in a packaging machine. The device can clean the tobacco debris from the visual detection window of the cigarette imaging detector 2 through the cavity structure of the first cigarette detection plate 1 and compressed gas. At the same time, by adjusting the flow rate and / or pressure, the pressure and / or angle of the compressed gas spraying the debris onto the cigarette imaging detector 2 can be increased, thereby enhancing the cleaning effect on adhesive debris and preventing debris from affecting the rejection action of the equipment's rejection device, which would cause qualified cigarette groups to be rejected and result in unnecessary cost waste.

[0041] The system employs a combination of shape and color detection. By conducting a secondary inspection to determine whether debris has been cleaned, the system categorizes the debris. For adhesive debris that is not ash or soot, the system promptly issues an alarm, reminding operators to manually clean the detection window of the cigarette imaging detector 2. The secondary inspection also verifies the cleaning effectiveness. Furthermore, the system incorporates quality defect detection for missing filters in cigarette sets, adding category identification for defective cigarette sets. The detection algorithm is optimized to prevent adhesive debris from obstructing the detection window of the cigarette imaging detector 2, which would cause the equipment to frequently operate during cigarette removal, increasing the amount of residual smoke and affecting the normal operating efficiency of the equipment.

[0042] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic cleaning device for cigarette detection in a packaging machine, comprising a first cigarette detection plate (1), a second cigarette detection plate (11), a cigarette imaging detector (2), a support plate (21), a cigarette detection plate positioning shaft (3), a first cigarette detection plate positioning block (4), a second cigarette detection plate positioning block (41), a positioning retaining ring (5), an air pipe adapter (6), and an air pipe (7); characterized in that: The first cigarette detection plate is set on the filter side of the cigarette mold box. A support plate is set on the outside of the first cigarette detection plate. A cigarette imaging detector is installed on the support plate. The first cigarette detection plate and the second cigarette detection plate are set parallel to each other and are installed on the positioning shaft. The positioning shaft and the two sides of the first cigarette detection plate are respectively installed with the first cigarette detection plate positioning block and the positioning retaining ring. The positioning shaft and the two sides of the second cigarette detection plate are respectively provided with the shaft shoulder and the second cigarette detection plate positioning block. An air pipe adapter is installed at one end of the positioning shaft. An air pipe is connected to the air pipe adapter. An air hole channel (103) and an air outlet nozzle (104) are opened inside the first cigarette detection plate. The first cigarette detection plate (1) near the filter tip of the cigarette mold box has an air inlet (102), an air channel (103), and an air outlet (104) inside. One end of the first cigarette detection plate has a first mounting hole, and the air inlet is connected to the first mounting hole. The air inlet delivers compressed gas to the air outlet through the air channel. The air outlet faces the cigarette imaging detector and is located above the cigarette imaging detector. The air outlet angle of the air outlet is set at an acute angle with the detection surface of the cigarette imaging detector. The first and second cigarette detection plates are mounted on the positioning shaft through the first mounting hole. The first and second cigarette detection plates are symmetrically and parallelly arranged on the front and rear sides of the cigarette mold box. The positioning shaft has a first air hole (301) and a second air hole (302). The first mounting hole of the first cigarette detection plate corresponds to and communicates with the first air hole of the positioning shaft. One end of the positioning shaft has a stepped second air hole, and the outer surface of the other end has a shaft shoulder (303). The air inlet end of the second air hole has an internal thread. An air pipe adapter is connected to the positioning shaft through the internal thread. The other end of the air pipe adapter is connected to an air pipe, and the other end of the air pipe is sequentially connected to a flow valve, a solenoid valve, and a compressed air source. The solenoid valve is electrically connected to a relay, and the relay is electrically connected to the main controller of the equipment. The flow valve is used to adjust the injection flow rate and speed of the compressed gas, with the gas pressure adjustable between 0.2 MPa and 0.7 MPa. Meanwhile, the first cigarette detection plate is made of 3D-printed ABS material. One end of the positioning block of the first cigarette detection plate is mounted on the positioning shaft by a clamp structure, and the other end is connected to one side of the first cigarette detection plate by a screw; one end of the positioning block of the second cigarette detection plate is mounted on the positioning shaft by a clamp structure, and the other end is connected to one side of the second cigarette detection plate by a screw; the first cigarette detection plate is mounted on the positioning shaft by the positioning block and the positioning retaining ring respectively, and the axial installation position of the first cigarette detection plate (1) along the positioning shaft (3) is adjustable, and the installation position of the corresponding exhaust nozzle is adjustable; the positioning retaining ring is mounted on the positioning shaft by a screw.

2. The automatic cleaning device for cigarette detection in a packaging machine as described in claim 1, characterized in that, Multiple air outlet nozzles are provided on the lower side of the first cigarette detection plate. The air outlet nozzles are evenly arranged on the lower side of the first cigarette detection plate at a spacing of 3-4 cm. The air outlet angle of the air outlet nozzles and the detection surface of the cigarette imaging detector are set within the range of 30-60°. By adjusting the air outlet angle of the air outlet nozzles and the detection surface of the cigarette imaging detector, and by adjusting the axial installation position of the first cigarette detection plate along the positioning axis, the sweeping angle and jet force of the compressed air at the air outlet nozzles can be effectively improved.

3. The automatic cleaning device for cigarette detection in a packaging machine as described in claim 2, characterized in that, The diameter of the exhaust nozzle (104) is set to 3.5mm-6.5mm, the diameter of the air passage is set to 4.5mm-5.5mm, the diameter of the first air hole of the positioning shaft is 2.5mm larger than the diameter of the air inlet hole, and the inner diameter of the stepped second air hole inside the positioning shaft is 3mm smaller than the diameter of the internal thread hole. When installing the positioning shaft, the positions of the first air hole and the air inlet hole of the positioning shaft need to be aligned. The first cigarette detection plate is guided along the axial direction of the positioning shaft and the positions of the first air hole and the air inlet hole are positioned by the structure of the positioning guide protrusion and the positioning guide groove.

4. An automatic cleaning device for cigarette detection in a packaging machine as described in claim 3, characterized in that, Multiple first air holes (301) are provided along the axial direction on the positioning shaft (3). After selecting a certain first air hole as the specific installation position, the other first air holes are sealed by plugging.

5. A detection method for an automatic cleaning device for detecting cigarettes in a packaging machine, comprising the automatic cleaning device for detecting cigarettes in a packaging machine as described in claim 3 or 4, comprising the following steps: Step S1: After the cigarette imaging detector takes an image of the filter side inside the cigarette mold box, it transmits it to the controller. The controller performs shape detection and color detection. If irregularly shaped debris is found in the detection image of the filter side and the debris is not white, it is determined that such debris is tobacco dust or tobacco shreds, and proceeds to step S2. If there is no irregularly shaped debris in the detection image and the image of the cigarette filter shows that at least one filter is missing, it is determined that the cigarette is missing a filter. The controller sends a rejection signal to the cigarette group rejection device of the equipment to empty the group of cigarettes. Step S2: After determining that the debris is tobacco dust or tobacco shreds, the controller sends a drive signal to the relay. After receiving the drive signal, the relay activates the solenoid valve control circuit, and then the solenoid valve opens the compressed air source. The compressed air in the compressed air source enters the positioning shaft of the cigarette detection plate through the flow valve along the air pipe, and then enters the air inlet of the first cigarette detection plate through the first air hole. After that, it is sprayed from the air outlet (104) along the air hole channel to the detection surface of the cigarette imaging detector (2) to remove the debris. Step S3: After compressed air is sprayed onto the detection surface of the cigarette imaging detector to remove debris, proceed to step S1. If irregularly shaped debris is still found in the detection image on the filter side and the debris is not white, proceed to step S2 again. At this time, increase the spray pressure and / or flow rate of the exhaust nozzle. Then proceed to step S1 again. If irregularly shaped debris is still found in the detection image on the filter side and the debris is not white after detection, the controller sends a stop signal to the main controller of the equipment to remind the operator that the cigarette imaging detector is detecting abnormalities. If no irregularly shaped foreign objects are found in the inspection image on the filter side, it is determined that the foreign objects have been removed, and the next set of cigarettes will be inspected.

Images