Automatic cleaning device for cigarette detection of packaging machine and detection method

Abstract

The invention discloses an automatic cleaning device for cigarette detection of a packaging machine. The automatic cleaning device 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 check ring (5), an air pipe adapter (6) and an air pipe (7). The cigarette detection device is characterized in that the first cigarette detection plate is arranged on the filter tip side of the cigarette mold box, a first cigarette detection plate positioning block and a positioning check ring are installed on the positioning shaft and located on the two side faces of the first cigarette detection plate respectively, an air pipe adapter is installed at one end of the positioning shaft, and an air hole channel and an air outlet spray hole are formed in the first cigarette detection plate. According to the invention, the frequency of foreign matters such as cigarette powder and dust adhering to the detection window can be effectively reduced, the cost consumption caused by mistaken removal of cigarettes is avoided, and meanwhile, the cleaning time of manual maintenance of the cigarette imaging detector is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of cigarette manufacturing and processing devices, and in particular to an automatic cleaning device and a detection method for cigarette detection in a packaging machine. Background Art

[0002] In the cigarette wrapping and forming process, the cigarettes in the cigarette mold box often cause the accumulation of tobacco foam and ash in the cigarette conveying channel due to contact with the two sides of the conveying channel or mechanical structures such as the cigarette pusher guide. In the actual production process, during the falling and conveying of cigarettes, due to the rubbing and squeezing of cigarettes and the stirring of the stirring roller, the tobacco at the end of the cigarette falls into the conveying channel, causing the tobacco foam and ash to adhere to the surface of the cigarette imaging detector during the conveying process, thus causing the cigarette imaging detector to misjudge and reject the cigarette group in the normal station mold box, resulting in the loss of qualified cigarettes, which seriously affects the production cost of raw and auxiliary materials in the cigarette manufacturing process.

[0003] In response to the technical problems existing in the above-mentioned cigarette detection, the present invention hopes to change the structure of the cigarette conveying mold box and the detection method, so as to reduce the frequency of tobacco foam adhering to the surface of the cigarette imaging detector, reduce the rejection of qualified cigarettes due to misoperation of the cigarette imaging detector, shorten the time for manual maintenance of the cleaning surface of the detector, and effectively reduce the cost waste caused by the misrejection of cigarettes. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an automatic cleaning device and a detection method for cigarette detection in a packaging machine, aiming to solve the problem that the original cigarette imaging detector misjudges that the cigarette group contains unqualified cigarettes and performs a rejection action due to the adhesion of smoke foam and cigarette ash generated in the cigarette conveying channel to the surface, thereby avoiding the cost consumption caused by the false rejection of cigarettes; at the same time, it reduces the frequency of foreign matter such as smoke foam and dust adhering to the detection window, effectively shortens the cleaning time of the manual maintenance of the cigarette imaging detector, and by optimizing the detection method, increases the category judgment of the unqualified cigarette group, reduces the rejection action caused by the adhesion of smoke foam on the filter part of the cigarette, and further avoids unnecessary cigarette production cost loss from the detection algorithm.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: 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 vertical 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 is arranged on the filter tip side of a cigarette mold box, a support vertical plate is arranged on the outer side of the first cigarette detection plate, and the support vertical plate is arranged on the outer side of the first cigarette detection plate. A cigarette imaging detector is installed on the board, the first cigarette detection plate and the second cigarette detection plate are arranged in parallel and installed on the positioning shaft, the first cigarette detection plate positioning block and the positioning retaining ring are respectively installed on the positioning shaft and on both sides of the first cigarette detection plate, the positioning shaft and the second cigarette detection plate positioning block are respectively arranged on the positioning shaft and on both sides of the second cigarette detection plate, an air pipe adapter is installed at one end of the positioning shaft, and an air pipe is connected to the air pipe adapter, and an air hole channel (103) and an air outlet nozzle (104) are opened in the first cigarette detection plate.

[0006] Furthermore, an air inlet hole (102), an air hole channel (103), and an air outlet nozzle hole (104) are provided inside the first cigarette detection plate (1) near the filter tip of the cigarette mold box. A first mounting hole is provided at one end of the first cigarette detection plate. The air inlet hole is connected to the first mounting hole. The air inlet hole transmits compressed gas to the air outlet nozzle hole through the air hole channel. The air outlet nozzle hole faces the cigarette imaging detector. The air outlet nozzle hole is located at the upper part of the cigarette imaging detector, and the air outlet angle of the air outlet nozzle hole forms an acute angle with the detection surface of the cigarette imaging detector.

[0007] Furthermore, the first cigarette detection plate and the second cigarette detection plate are installed 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 is provided with a first air hole (301) and a second air hole (302). The first mounting hole of the first cigarette detection plate is correspondingly connected to the first air hole of the positioning shaft. A stepped second air hole is provided 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 the 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 a main controller of the device. The flow valve is used to adjust the injection flow and speed of the compressed gas, wherein the adjustment range of the gas pressure is between 0.2MPa and 0.7Mpa. At the same time, the first cigarette detection plate is made of 3D printed ABS material.

[0008] Furthermore, one end of the first cigarette detection plate positioning block is mounted on the positioning shaft via a clamp structure, and the other end is connected to a side surface of the first cigarette detection plate via a screw; one end of the second cigarette detection plate positioning block is mounted on the positioning shaft via a clamp structure, and the other end is connected to a side surface of the second cigarette detection plate via a screw; the first cigarette detection plate is mounted on the positioning shaft via the first cigarette detection plate positioning block and the positioning retaining ring, respectively; the axial mounting position of the first cigarette detection plate (1) along the positioning shaft (3) is adjustable, and the mounting position of the corresponding air outlet nozzle 9104 is adjustable; the positioning retaining ring is mounted on the positioning shaft via a screw.

[0009] Furthermore, a plurality of air outlet nozzles are provided on the lower side of the first cigarette detection plate, and the air outlet nozzles are evenly arranged on the lower side of the first cigarette detection plate at intervals of 3-4 cm, and the angle between the air outlet angle of the air outlet nozzles and the detection surface angle of the cigarette imaging detector is set within the range of 30-60°; by adjusting the air outlet angle of the air outlet nozzles and the detection surface angle of the cigarette imaging detector, and adjusting the axial installation position of the first cigarette detection plate along the positioning axis, the scanning angle and the spray force of the compressed air at the air outlet nozzles can be effectively improved.

[0010] Furthermore, the aperture of the air outlet nozzle (104) is set to 3.5mm-6.5mm, the aperture of the air hole channel is set to 4.5mm-5.5mm, the first air hole of the positioning shaft is 2.5mm larger than the aperture of the air inlet hole, and the inner aperture of the stepped second air hole inside the positioning shaft is 3mm smaller than the aperture of the internal thread; when installing the positioning 3, the first air hole of the positioning shaft and the air inlet hole position need to be aligned, and the first cigarette detection plate is guided along the axial direction of the positioning shaft and the first air hole and the air inlet hole are positioned by the structure in which the positioning guide convex strip and the positioning guide groove cooperate.

[0011] Furthermore, a plurality of first air holes (301) are provided on the positioning shaft (3) along the axial direction, and after a certain first air hole is selected as a specific installation position, the other first air holes are blocked by plugging.

[0012] A detection method for an automatic cleaning device for cigarette detection in a packaging machine, comprising the following steps: Step S1: After taking a picture of the filter tip side in the cigarette mold box, the cigarette imaging detector transmits the picture to the controller, which performs shape detection and color detection. If irregular-shaped debris is found in the detection picture of the filter tip side and the color of the debris is not white, it is determined that such debris is tobacco foam or tobacco shreds, and the process goes to step S2; if there is no irregular-shaped debris in the detection picture and the image of the cigarette filter tip shows that at least one filter tip is missing, it is determined that the cigarette lacks a filter tip, and 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 foreign matter is cigarette foam or tobacco shreds, the controller sends a driving signal to the relay, and after receiving the driving signal, the relay operates to connect the electromagnetic valve control circuit, and then the electromagnetic valve opens the compressed air source, and the compressed air in the compressed air source passes through the flow valve along the air pipe into the positioning shaft of the cigarette detection plate, and then enters the air inlet of the first cigarette detection plate through the first air hole, and then is sprayed from the air outlet nozzle (104) along the air hole channel to the detection surface of the cigarette imaging detector (2) to remove the foreign matter; Step S3: After compressed air is sprayed onto the detection surface of the cigarette imaging detector to remove debris, step S1 is entered again. If it is found that there are still irregularly shaped debris and the color of the debris is not white in the detection image on the filter side, step S2 is entered again. At this time, the injection pressure and / or flow rate of the air outlet nozzle can be increased; then step S1 is performed again. If it is still found that there are still irregularly shaped debris and the color of the debris is not white in the detection image on the filter side after detection, the controller sends a stop signal to the main controller of the equipment to remind the operator that the cigarette imaging detector detects abnormalities; if it is found that there are no irregularly shaped debris in the detection image on the filter side, it is determined that the foreign matter has been removed, and the next group of cigarettes is tested.

[0013] The automatic cleaning device and detection method for cigarette detection in a packaging machine of the present invention can clean the tobacco foam debris in the visual detection window of a cigarette imaging detector through the cavity structure of a 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 debris on the cigarette imaging detector can be increased, thereby enhancing the cleaning effect on adhesive debris, preventing the debris from affecting the rejection action of the equipment's rejection device, causing qualified cigarette groups to be rejected, and generating unnecessary cost waste.

[0014] A combination of shape detection and color detection is adopted to determine the type of debris through secondary detection of whether the debris has been cleared. For adhesive debris other than ash and cigarette foam, the equipment will promptly issue an alarm message to remind the operator to manually maintain the detection window of the cigarette imaging detector to remove the debris. At the same time, secondary detection is used to verify the cleaning effect, and during the detection process, quality defect detection of cigarette groups with missing filters is added, and category judgment of unqualified cigarette groups is added. The detection algorithm is optimized to prevent adhesive debris from blocking the detection window of the cigarette imaging detector, which causes frequent movement of the cigarette rejection part of the equipment, increases the amount of residual cigarettes in the equipment, and affects the normal operation efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the automatic cleaning device for cigarette detection in a packaging machine according to the present invention; Figure 2 It is a schematic cross-sectional structure diagram of a concave sealing device for heat-not-burn tobacco particles of the present invention; Figure 3This is a schematic structural diagram of an embodiment of a punch needle assembly of the present invention; Figure 4 It is a structural schematic diagram of another embodiment of the punch needle assembly of the present invention; Figure 5 It is a structural schematic diagram of another embodiment of the punch needle assembly of the present invention; Figure 6 It is a schematic diagram of the detection method of the present invention.

[0016] In the figure: the first cigarette detection plate 1, the second cigarette detection plate 11, the cigarette imaging detector 2, the supporting vertical plate 21, the cigarette detection plate positioning shaft 3, the first cigarette detection plate positioning block 4, the second cigarette detection plate positioning block 41, the positioning retaining ring 5, the air pipe adapter 6, the air pipe 7, the first mounting hole 101, the air inlet hole 102, the air hole channel 103, the air outlet nozzle 104, the first air hole 301, the second air hole 302, the shaft shoulder 303, and the second mounting hole 42. DETAILED DESCRIPTION

[0017] In order to make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described in detail in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present invention, which are only used to explain the present invention, not to limit the present invention. It should be noted that, for the convenience of description, only the parts / structures related to the present invention are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0018] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should be the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1-5As shown, an automatic cleaning device for cigarette detection in a packaging machine comprises 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 1 is arranged on the filter tip side of a cigarette mold box, a support plate 21 is arranged on the outer side of the first cigarette detection plate 1, a cigarette imaging detector 2 is installed on the support plate 21, and the first cigarette detection plate 1 and the second cigarette detection plate 1 are connected to each other. The two cigarette detection plates 11 are arranged in parallel and installed on the cigarette detection plate positioning axis 3. The first cigarette detection plate positioning block 4 and the positioning retaining ring 5 are respectively installed on the cigarette detection plate positioning axis 3 and on both sides of the first cigarette detection plate 1. The shaft retaining shoulder 303 and the second cigarette detection plate positioning block 41 are respectively arranged on the cigarette detection plate positioning axis 3 and on both sides of the second cigarette detection plate 11. An air pipe adapter 6 is installed at one end of the cigarette detection plate positioning axis 3. The air pipe adapter 6 is connected to the air pipe 7. An air hole channel 103 and an air outlet nozzle 104 are opened in the first cigarette detection plate 1.

[0021] An air inlet hole 102, an air hole channel 103 and an air outlet nozzle 104 are provided inside the first cigarette detection plate 1 close to the filter tip of the cigarette mold box. A first mounting hole 101 is provided at one end of the first cigarette detection plate 1. The air inlet hole 102 is connected to the first mounting hole 101. The air inlet hole 102 can transport compressed gas to the air outlet nozzle 104 through the air hole channel 103. The air outlet nozzle 104 is directly opposite to the cigarette imaging detector 2. The air outlet nozzle 104 is located at the upper part of the cigarette imaging detector 2, and the air outlet angle of the air outlet nozzle 104 is set at an acute angle with the detection surface of the cigarette imaging detector 2. The second cigarette detection plate 11 away from the filter tip side of the cigarette mold box has the same shape as the first cigarette detection plate 1, but does not have an air outlet nozzle 104.

[0022] The first cigarette detection plate 1 and the second cigarette detection plate 11 are installed on the positioning shaft 3 through the first installation 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 is provided with a first air hole 301 and a second air hole 302. The first installation hole 101 of the first cigarette detection plate 1 is correspondingly connected to the first air hole 301 of the positioning shaft 3. A stepped second air hole 302 is provided inside one end of the positioning shaft 3, and a shaft stop 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 Internal thread, the air pipe adapter 6 is connected to the positioning shaft 3 through the internal thread, the other end of the air pipe adapter 6 is connected to the air pipe 7, the other end of the air pipe 7 is connected to the flow valve, the solenoid valve, and the compressed air source in sequence, the solenoid valve is electrically connected to the 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 and speed of the compressed gas, and the gas pressure can be adjusted in the range of 0.2MPa to 0.7Mpa (megapascals); at the same time, the first cigarette detection plate 1 can be made of 3D printed ABS material to reduce the processing difficulty and improve the compressed air impurity removal effect.

[0023] One end of the first cigarette detection plate positioning block 4 is installed on the positioning shaft 3 through a clamp structure (including a threaded connection), and the other end is connected to a side surface of the first cigarette detection plate 1 through a screw; one end of the second cigarette detection plate positioning block 41 is installed on the positioning shaft 3 through a clamp structure (including a threaded connection), and the other end is connected to a side surface of the second cigarette detection plate 11 through a screw; the first cigarette detection plate 1 is installed on the positioning shaft 3 through the first cigarette detection plate positioning block 4 and the positioning retaining ring 5 respectively, 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 air outlet nozzle 104 is adjustable; the positioning retaining ring 5 is installed on the positioning shaft 3 through screws.

[0024] 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 angles of the air outlet nozzles 104 and the angle between the detection surface of the cigarette imaging detector 2 are set within the range of 30-60°. By adjusting the air outlet angles of the air outlet nozzles 104 and the angle between the detection surface of the cigarette imaging detector 2, and adjusting the axial installation position of the first cigarette detection plate 1 along the positioning axis 3, the scanning angle and the jetting force of the compressed air at the air outlet nozzles 104 can be effectively improved, thereby improving the area range and the impurity removal effect of the compressed air scanning.

[0025] The aperture of the air outlet nozzle 104 is set to 3.5mm-6.5mm, the aperture of the air hole channel 103 is set to 4.5mm-5.5mm, the first air hole 301 of the positioning shaft 3 is 2.5mm larger than the aperture of the air inlet hole 102, and the inner aperture of the stepped second air hole 302 inside the positioning shaft 3 is 3mm smaller than the aperture of the internal thread; when installing the positioning shaft 3, it is necessary to align the first air hole 301 of the positioning shaft 3 with the air inlet hole 102, and 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 hole 102 can be positioned by the structure in which the positioning guide convex strip and the positioning guide groove cooperate.

[0026] In one embodiment, in the case where the axial installation position of the first cigarette detection plate 1 along the positioning axis 3 is adjustable, a plurality of first air holes 301 are axially opened on the positioning axis 3. After one of the first air holes 301 is selected as the specific installation position, the other first air holes 301 are blocked by plugging.

[0027] like Figure 6 As shown, a detection method for an automatic cleaning device for cigarette detection in a packaging machine comprises the following steps: Step S1: After taking a picture of the filter tip side in the cigarette mold box, the cigarette imaging detector 2 transmits the picture to the controller, which performs shape detection and color detection. If irregular-shaped debris is found in the detection picture of the filter tip side and the color of the debris is not white, it is determined that such debris is tobacco foam or tobacco shreds, and the process goes to step S2; if there is no irregular-shaped debris in the detection picture and the image of the cigarette filter tip shows that at least one filter tip is missing, it is determined that the cigarette lacks a filter tip, and 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 impurities are cigarette foam or tobacco shreds, the controller sends a driving signal to the relay, and after receiving the driving signal, the relay operates to connect the electromagnetic valve control circuit, and then the electromagnetic valve opens the compressed air source, and the compressed air in the compressed air source passes through the flow valve along the air pipe 7 into the cigarette detection plate positioning shaft 3, and then enters the air inlet 102 of the first cigarette detection plate 1 through the first air hole 301, and then is sprayed from the air outlet nozzle 104 along the air hole channel 103 to the detection surface of the cigarette imaging detector 2 to remove the impurities; Step S3: After compressed air is sprayed onto the detection surface of the cigarette imaging detector 2 to remove the debris, then go to step S1. If it is found that there are still irregularly shaped debris and the color of the debris is not white in the detection image on the filter side, then go to step S2 again. At this time, the injection pressure and / or flow rate of the air outlet nozzle 104 can be increased; then step S1 is performed again. If it is still found that there are still irregularly shaped debris and the color of the debris is not white in the detection image on the filter side after the detection, the controller sends a stop signal to the main controller of the equipment to remind the operator that the cigarette imaging detector 2 detects abnormalities; if it is found that there are no irregularly shaped debris in the detection image on the filter side, it is determined that the foreign matter has been removed, and the next group of cigarettes is tested.

[0028] The automatic cleaning device and detection method for cigarette detection in a packaging machine of the present invention can clean the tobacco foam debris in the visual detection window of the cigarette imaging detector 2 through the cavity structure of the first cigarette detection plate 1 and the compressed gas. At the same time, by adjusting the flow rate and / or pressure, the pressure and / or angle of the compressed gas spraying debris on the cigarette imaging detector 2 can be increased, thereby enhancing the cleaning effect on adhesive debris, preventing the debris from affecting the rejection action of the equipment rejection device, causing qualified cigarette groups to be rejected, and generating unnecessary cost waste.

[0029] A combination of shape detection and color detection is adopted to determine the type of debris through secondary detection of whether the debris has been cleared. For adhesive debris other than ash and cigarette foam, the equipment will promptly issue an alarm message to remind the operator to manually maintain the detection window of the cigarette imaging detector 2 to remove the debris. At the same time, secondary detection is used to verify the cleaning effect, and during the detection process, quality defect detection of cigarette groups with missing filters is added, and category judgment of unqualified cigarette groups is added. The detection algorithm is optimized to prevent adhesive debris from blocking the detection window of the cigarette imaging detector 2, causing frequent movement of the cigarette rejection part of the equipment, increasing the amount of residual cigarettes in the equipment, and affecting the normal operation efficiency of the equipment.

[0030] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached 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 arranged on the filter tip side of the cigarette mold box, a supporting vertical plate is arranged on the outer side of the first cigarette detection plate, a cigarette imaging detector is installed on the supporting vertical plate, the first cigarette detection plate and the second cigarette detection plate are arranged in parallel and installed on the positioning shaft, the first cigarette detection plate positioning block and the positioning retaining ring are respectively installed on the positioning shaft and on both sides of the first cigarette detection plate, the shaft retaining shoulder and the second cigarette detection plate positioning block are respectively arranged on the positioning shaft and on both sides of the second cigarette detection plate, an air pipe adapter is installed at one end of the positioning shaft, an air pipe is connected to the air pipe adapter, and an air hole channel (103) and an air outlet nozzle (104) are opened in the first cigarette detection plate.

2. The automatic cleaning device for cigarette detection in a packaging machine according to claim 1, characterized in that: An air inlet hole (102), an air hole channel (103), and an air outlet nozzle hole (104) are provided inside the first cigarette detection plate (1) near the filter tip of the cigarette mold box. A first mounting hole is provided at one end of the first cigarette detection plate. The air inlet hole is connected to the first mounting hole. The air inlet hole transmits compressed gas to the air outlet nozzle hole through the air hole channel. The air outlet nozzle hole faces the cigarette imaging detector. The air outlet nozzle hole is located at the upper part of the cigarette imaging detector, and the air outlet angle of the air outlet nozzle hole forms an acute angle with the detection surface of the cigarette imaging detector.

3. The automatic cleaning device for cigarette detection in a packaging machine according to claim 2, characterized in that: The first cigarette detection plate and the second cigarette detection plate are installed 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 is provided with a first air hole (301) and a second air hole (302). The first mounting hole of the first cigarette detection plate is correspondingly connected to the first air hole of the positioning shaft. A stepped second air hole is provided 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 the 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 a main controller of the device. The flow valve is used to adjust the injection flow and speed of the compressed gas, wherein the adjustment range of the gas pressure is between 0.2MPa and 0.7Mpa. At the same time, the first cigarette detection plate is made of 3D printed ABS material.

4. The automatic cleaning device for cigarette detection in a packaging machine according to claim 3, characterized in that: One end of the first cigarette detection plate positioning block is mounted on the positioning shaft via a clamp structure, and the other end is connected to a side surface of the first cigarette detection plate via a screw; one end of the second cigarette detection plate positioning block is mounted on the positioning shaft via a clamp structure, and the other end is connected to a side surface of the second cigarette detection plate via a screw; the first cigarette detection plate is mounted on the positioning shaft via the first cigarette detection plate positioning block and the positioning retaining ring, respectively; the axial mounting position of the first cigarette detection plate (1) along the positioning shaft (3) is adjustable, and the mounting position of the corresponding air outlet nozzle 9104 is adjustable; the positioning retaining ring is mounted on the positioning shaft via a screw.

5. The automatic cleaning device for cigarette detection in a packaging machine according to claim 4, characterized in that: A plurality of air outlet nozzles are provided on the lower side of the first cigarette detection plate, and the air outlet nozzles are evenly arranged on the lower side of the first cigarette detection plate at intervals of 3-4 cm. The air outlet angle of the air outlet nozzles and the angle between 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 angle between the detection surface of the cigarette imaging detector, and adjusting the axial installation position of the first cigarette detection plate along the positioning axis, the scanning angle and the spray force of the compressed air at the air outlet nozzles can be effectively improved.

6. An automatic cleaning device for cigarette detection in a packaging machine as claimed in claim 5, characterized in that: The aperture of the air outlet nozzle (104) is set to 3.5mm-6.5mm, the aperture of the air hole channel is set to 4.5mm-5.5mm, the first air hole of the positioning shaft is 2.5mm larger than the aperture of the air inlet hole, and the inner aperture of the stepped second air hole inside the positioning shaft is 3mm smaller than the inner thread aperture; when installing the positioning 3, the first air hole of the positioning shaft and the air inlet hole position need to be aligned, and the first cigarette detection plate is guided along the axial direction of the positioning shaft and the first air hole and the air inlet hole position are positioned by the structure in which the positioning guide convex strip and the positioning guide groove cooperate.

7. An automatic cleaning device for cigarette detection in a packaging machine as claimed in claim 6, characterized in that: A plurality of first air holes (301) are provided on the positioning shaft (3) along the axial direction. After a certain first air hole is selected as a specific installation position, the other first air holes are blocked by plugging.

8. A detection method for an automatic cleaning device for cigarette detection in a packaging machine, comprising the automatic cleaning device for cigarette detection in a packaging machine as claimed in claim 6 or 7, comprising the following steps: Step S1: After taking a picture of the filter tip side in the cigarette mold box, the cigarette imaging detector transmits the picture to the controller, which performs shape detection and color detection. If irregular-shaped debris is found in the detection picture of the filter tip side and the color of the debris is not white, it is determined that such debris is tobacco foam or tobacco shreds, and the process goes to step S2; if there is no irregular-shaped debris in the detection picture and the image of the cigarette filter tip shows that at least one filter tip is missing, it is determined that the cigarette lacks a filter tip, and 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 foreign matter is cigarette foam or tobacco shreds, the controller sends a driving signal to the relay, and after receiving the driving signal, the relay operates to connect the electromagnetic valve control circuit, and then the electromagnetic valve opens the compressed air source, and the compressed air in the compressed air source passes through the flow valve along the air pipe into the positioning shaft of the cigarette detection plate, and then enters the air inlet of the first cigarette detection plate through the first air hole, and then is sprayed from the air outlet nozzle (104) along the air hole channel to the detection surface of the cigarette imaging detector (2) to remove the foreign matter; Step S3: After compressed air is sprayed onto the detection surface of the cigarette imaging detector to remove the debris, the process proceeds to step S1. If it is found that there are still irregularly shaped debris in the detection image of the filter tip side and the color of the debris is not white, the process proceeds to step S2 again, at this time increasing the injection pressure and / or flow rate of the air outlet nozzle; then, the process proceeds to step S1 again. If there are still irregularly shaped debris in the detection image of the filter tip side and the color of the debris is not white after the detection, the controller sends a stop signal to the main controller of the equipment to remind the operator that the cigarette imaging detector detects abnormalities; If no irregularly shaped debris is found in the inspection image on the filter side, it is determined that the foreign matter has been removed and the next group of cigarettes will be inspected.

Images