JP2010036089A - Can washing apparatus and process for washing can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can washing apparatus which eliminates a fallen can body and another can body contaminated with the fallen can body and prevents such can bodies from flowing out at the post processes, and to provide a method for washing cans using the can washing apparatus. <P>SOLUTION: The can washing apparatus 10, for conveying a bottomed tubular can body 50 rising while keeping the can axis direction vertical and washing the surface of the can body 50, has a washing part for washing the can body 50 by supplying a treatment liquid thereto, and a drying part 30 for drying the washed can body 50. A first fallen can detection part 41 for detecting the fallen cans is arranged at a charging mouth 31 of the drying part 30, and a second fallen can detection part 42 for detecting the fallen cans is arranged at a discharging port 32 of the drying part 30. In the discharging port 32, a single can discharging mechanism 14 for discharging only the fallen cans and a plural can discharging mechanism 33 for discharging the fallen cans and the surrounding can body 50 are installed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a can cleaning apparatus for cleaning a bottomed cylindrical can body in an upright state and a can cleaning method using the can cleaning apparatus.

In the molding process of cans used as containers for beverages, for example, the surface of a can body molded by drawing / ironing (DI processing) is described above in order to obtain a surface state suitable for external coating and internal coating. The can cleaning device is used.
This can cleaning apparatus includes a transport path for transporting a can body, a cleaning section having a plurality of sprays for spraying treatment liquid such as water and cleaning liquid in each step, and a can body cleaned by the cleaning section. And a drying section for drying (see, for example, Patent Document 1).

In this can washing | cleaning apparatus, a can body is wash | cleaned in order of a water washing process, a degreasing process, a water washing process, a chemical conversion treatment process, a water washing process, a pure water process, and a drying process, for example.
In each of the water washing step, degreasing step, water washing step, chemical conversion treatment step, water washing step, and pure water step, the cleaning liquid is formed from the top and bottom of the plurality of cans that are erected with the bottom of the can facing upward on the conveyance path The surface of the can is cleaned by spraying a treatment liquid such as

  As described above, in the conventional can cleaning apparatus, since a processing liquid such as a cleaning liquid or water is sprayed on the can body, the overturned can occurs due to the pressure of the processing liquid in each step. Further, in the conveyance path, the filling amount of the bottomed cylindrical can body varies, the interval between the can bodies may be widened, and the overturned can may be generated due to mechanical vibration. Furthermore, the bottomed cylindrical can body is usually in a shape that is longer in the can axis direction than in its radial direction, and has a shape that can be easily overturned.

Here, when a falling can occurs in the can cleaning device, the surface of the can body is not sufficiently cleaned, and the thickness of the surface film to be formed is not sufficiently formed. There was a problem.
For this reason, in the conventional can cleaning apparatus, since a collapsed can body (falling can) does not flow out to the subsequent process, a suction conveyance device (so-called vacuum transfer) is disposed between the cleaning unit and the drying unit. Yes.

This suction conveyance machine adsorbs and conveys the upper surface (can bottom part) of an upright bottomed cylindrical can body. Therefore, the falling can is not adsorbed by the suction conveyance machine, is eliminated by dropping from the conveyance path, and is prevented from flowing into the drying unit.
JP 2003-72930 A

However, in the conventional can cleaning apparatus, there is a case where the fall can cannot be reliably removed by the suction conveyance machine. That is, when the sucking and conveying machine sucks and conveys the raised bottomed cylindrical can body, it is conveyed in a state where the fall can is sandwiched between the adsorbed can body and the can body, and the drying unit In some cases, a can was transported to the top.
In this case, not only the can that has been overturned is not sufficiently washed, but also the treatment liquid remains inside the overturned can, and this treatment liquid contaminates the normal standing body around the overturned can. There was a problem that.

  In particular, if a can contaminated with a processing solution such as a degreasing solution is dried in the drying section, it will be difficult to find the contaminated can on the appearance, so the cans existing around the fall cans are also excluded. However, in the suction conveyance machine, only the fall cans can be removed, and there is a possibility that the contaminated can body may flow out to the subsequent process.

  The present invention has been made in view of the above-described circumstances, and surely eliminates a fallen can body (fall can) and other can bodies contaminated by the fall can, and flows out to a subsequent process. It is an object of the present invention to provide a can cleaning apparatus capable of preventing the above and a can cleaning method using the can cleaning apparatus.

  In order to solve the above problems, a can cleaning device according to the present invention transports a bottomed cylindrical can body in a state where the can axis direction is erected in the vertical direction and the surface of the can body is A can cleaning apparatus for cleaning, comprising: a cleaning section for supplying a cleaning solution to the can body for cleaning; and a drying section for drying the cleaned can body. A first falling can detection unit for detecting a can is disposed, and a second falling can detection unit for detecting a falling can is disposed at the discharge port of the drying unit. A single-can discharge mechanism that discharges only the cans and a multiple-can discharge mechanism that discharges the overturned can and its surrounding cans are provided.

  According to the can cleaning device having this configuration, the first fall can detection unit is disposed at the charging port of the drying unit, and the second fall can detection unit is disposed at the discharge port of the drying unit. It is possible to distinguish and determine the cans that have occurred in the upstream side, that is, the cleaning unit, and the cans that have occurred in the drying unit. Here, in the falling can generated in the cleaning section, there is a possibility that the treatment liquid or the like remains inside and the can body around the falling can is contaminated. On the other hand, the falling can generated in the drying section has no risk of contaminating the surrounding can.

  In the can cleaning apparatus according to the present invention, the discharge port is provided with a single can discharge mechanism for discharging the fall can and a multiple can discharge mechanism for discharging the fall can and its surrounding cans, When a can that has occurred in the cleaning section is detected, the can is contaminated by the fall can and this can by discharging the can with a multiple can discharge mechanism that discharges the can and its surrounding cans. Can all be eliminated. On the other hand, when a fall can generated in the drying section is detected, only the fall can can be eliminated by the single can discharge mechanism. As a result, it is possible to reliably eliminate the cans and the contaminated cans, and it is not necessary to remove the cans that are not likely to be contaminated more than necessary, thereby improving the yield of the cans.

Here, when a fall can is detected by the first fall can detection unit, the fall can and its surrounding cans are discharged by the multiple can discharge mechanism, and only the second fall can detection unit falls. It is preferable to employ a configuration including a fall can discharge determination unit that transmits a command to discharge a fall can by a single can discharge mechanism.
In this case, by operating the single can discharge mechanism and the multiple can discharge mechanism in accordance with a command from the fall can discharge determination unit, as described above, the contaminated can body can be reliably removed and removed. The number of cans can be reduced.

Moreover, it is preferable that at least one of the first fall can detection unit and the second fall can detection unit is an optical area sensor.
In this case, it becomes possible to monitor all the cans on the conveyance path by the optical area sensor, and it is possible to reliably detect the overturned can.

The single can discharge mechanism may be a suction conveyance device that adsorbs and conveys the raised can body.
In this case, the falling can generated in the drying unit is not attracted to the suction conveyance machine, and only the falling can is excluded. In addition, when this suction conveyance machine is used, the can is transported in a state where the fall can is sandwiched between the cans adsorbed as described above, and the fall can may be transferred to a subsequent process. However, even if the falling can flows out to the subsequent process, the falling can is generated in the drying section, so there is no possibility of contaminating other normal cans.

  Further, the can cleaning method according to the present invention is a can cleaning method using the above-described can cleaning device, wherein the fall can is detected by the first fall can detection unit disposed at the loading port of the drying unit. When detected, the multiple can discharge mechanism discharges the fall can and its surrounding cans, and when a fall can is detected only by the second fall can detection unit, the single can discharge mechanism It is characterized by discharging the can.

  According to the can cleaning method of this configuration, when a fall can is detected by the first fall can detection unit, that is, when a fall can generated at the washing unit is detected, the fall can and its surrounding cans are detected. By discharging the can body by the multiple can discharging mechanism for discharging the body, it is possible to eliminate all the fall cans and can bodies contaminated by the fall cans. On the other hand, when a fall can is detected only in the second fall can detection unit, that is, when a fall can generated in the drying unit is detected, only the fall can can be eliminated by the single can discharge mechanism. .

  According to the present invention, a can cleaning apparatus capable of reliably eliminating a fallen can body (fallen can) and other can bodies contaminated by the fall can and preventing the can from flowing out to a subsequent process, and this A can cleaning method using a can cleaning device can be provided.

Embodiments of the present invention will be described below with reference to the accompanying drawings. The can cleaning apparatus according to the present embodiment is shown in FIGS.
The can cleaning apparatus 10 according to the present embodiment cleans the surface of the bottomed cylindrical can body 50 to obtain a surface state suitable for a printing process, which is a subsequent process.

First, the can 50 that is cleaned by the can cleaning device 10 will be described.
As shown in FIG. 5, the can body 50 has a bottomed cylindrical shape, a barrel portion 51 having a cylindrical shape centered on the can axis O, and one end side of the barrel portion 51 in the can axis O direction (FIG. 5). And a can bottom portion 53 provided on the other end side in the can axis O direction of the trunk portion 51 (upper side in FIG. 5).
The can bottom 53 includes a dome portion 54 that is recessed toward one end side in the can axis O direction, and an annular protrusion 55 that protrudes from the outer peripheral edge portion of the dome portion 54 toward the other end side in the can shaft O direction. Is provided.

  The can 50 is formed, for example, by punching an aluminum plate into a disk shape and subjecting the disk to drawing and ironing (DI processing). For this reason, in the state formed by DI processing, lubricating oil etc. have adhered to the surface of the can body 50, and in order to remove these lubricating oil etc., the can washing apparatus 10 which is this embodiment is utilized. .

  As shown in FIG. 1, the can cleaning apparatus 10 according to the present embodiment includes a first transport path 11 and a second transport path 12 that transport the can body 50, and the first transport path 11 and the second transport path 12. A first suction conveyance device 13 disposed between them, and a second suction conveyance device 14 disposed on the downstream side (right side in FIG. 1) of the second conveyance path 12 are provided.

The 1st conveyance path 11 and the 2nd conveyance path 12 are provided with sprocket 11A, 12A arrange | positioned at the both ends, and conveyor parts 11B, 12B hung on this sprocket 11A, 12A. Here, the conveyor parts 11B and 12B are made into the net shape provided with the several through-hole, and are set as the structure which can distribute | circulate the liquid.
The can body 50 is transported by the first transport path 11 and the second transport path 12 in a state where the opening 52 is grounded to the conveyor sections 11B and 12B and the can bottom section 53 stands up.

  The first transport path 11 is provided with a primary cleaning unit 21, a secondary cleaning unit 22, a degreasing processing unit 23, a primary rinsing unit 24, a chemical conversion processing unit 25, and a secondary rinsing unit 26. The second transport path 12 is provided with a pure water cleaning unit 27 and a drying unit 30. Here, the primary cleaning unit 21, the secondary cleaning unit 22, the degreasing processing unit 23, the primary rinsing unit 24, the chemical conversion processing unit 25, the secondary rinsing unit 26, and the pure water cleaning unit 27 are the cleaning unit in the present embodiment. It is set to 20.

The primary cleaning unit 21 includes a nozzle unit 21A that ejects cleaning liquid from the vertical direction of the can body 50 that is erected with the can bottom 53 facing upward, and a tank unit 21B that receives waste liquid used for cleaning. It removes the lubricating oil and the like adhering in the DI process, which is the previous process.
The secondary cleaning unit 22 includes a nozzle unit 22A that ejects cleaning liquid, a tank unit 22B that receives waste liquid, and a hold-down belt 22C that presses the can body 50 from above, and is dropped by the primary cleaning unit 21. The oil that has not been cut is removed.

The degreasing unit 23 includes a nozzle unit 23A that ejects degreasing liquid from the vertical direction of the can body 50, a tank unit 23B that receives used waste liquid, and a hold-down belt 23C that presses the can body 50 from above. The oil component that is provided and completely removes the oil adhering to the surface of the can body 50 and performs a surface treatment on the surface of the can body 50.
The primary rinsing section 24 includes a nozzle section 24A that ejects cleaning liquid from the vertical direction of the can body 50, and a tank section 24B that receives waste liquid, and removes the degreasing treatment liquid adhered by the degreasing treatment section 23. It is. In the primary rinse section 24, a plurality of upper and lower nozzle sections 24A are disposed in the transport direction (two sets in FIG. 1).

The chemical conversion unit 25 includes a nozzle unit 25A that ejects chemical conversion liquid from the vertical direction of the can body 50 and a tank unit 25B that receives used waste liquid, and is used in a printing process that is a subsequent process. The chemical conversion film for improving the adhesiveness is formed on the surface of the can body 50.
The secondary rinsing unit 26 includes a nozzle unit 26A that ejects cleaning liquid from the vertical direction of the can body 50, and a tank unit 26B that receives waste liquid, and removes the chemical conversion treatment liquid adhered by the chemical conversion treatment unit. is there. In the secondary rinse section 26, a plurality of upper and lower nozzle sections 26A are arranged in the transport direction (two sets in FIG. 1).

The pure water cleaning unit 27 provided in the second transport path 12 includes a nozzle unit 27A that ejects pure water from the vertical direction of the can body 50 that is erected with the can bottom 53 facing upward, and a tank unit 27B that receives waste liquid. And removing impurities attached to the can 50.
The drying unit 30 is provided at the downstream end of the second conveyance path 12 and dries the can 50 washed by the pure water washing unit 27.

  Further, in the first conveyance path 11 and the second conveyance path 12 provided with the cleaning unit 20 and the drying unit 30, an air supply unit 17 for pressing the can body 50 against the conveyor units 11B and 12B from above is provided in the conveyance direction. In this embodiment, seven are provided in the first conveyance path 11 and one is provided in the second conveyance path 12.

  The 1st suction conveyance machine 13 and the 2nd suction conveyance machine 14 are provided with adsorption surfaces 13A and 14A which face the lower side, and can 50 is put on adsorption surfaces 13A and 14A by sucking in from these adsorption surfaces 13A and 14A. It is set as the structure which adsorb | sucks. More specifically, the annular convex portion 55 of the can bottom 53 is brought into contact with the suction surfaces 13A and 14A, and the air in the dome portion 54 located radially inward of the annular convex portion 55 is sucked into the dome portion 54. Becomes negative pressure and the can 50 is adsorbed. Therefore, the fallen can body 50 (falling can) is not adsorbed by the adsorption surfaces 13A and 14A, and usually falls down below the first suction conveyance device 13 and the second suction conveyance device 14 to be eliminated. .

Next, the drying unit 30 will be described with reference to FIGS. A first falling can detection unit 41 that detects a collapsed can body 50 (falling can) is disposed at the loading port 31 of the drying unit 30, and a second falling can detection unit 42 is disposed at the discharge port 32 of the drying unit 30. Is arranged. In the present embodiment, the first falling can detection unit 41 and the second falling can detection unit 42 are optical area sensors that extend in the width direction of the conveyor unit 12B, as shown in FIG.
As shown in FIG. 4, the first falling can detection unit 41 and the second falling can detection unit 42 include a projector 43 that oscillates infrared light toward the can body 50 on the second transport path 12, and a can And a light receiver 44 that detects the infrared light reflected by the body 50. When a tilting can occurs, the infrared light oscillated from the light projector 43 is detected by the light receiver 44. As described above, the positions and angles of the projector 43 and the light receiver 44 are adjusted.

The discharge port 32 of the drying unit 30 is provided with a carry-out conveyor 33 connected to the downstream side of the second transfer path 12, and the second suction transfer machine 14 is disposed above the carry-out conveyor 33. . Here, the carry-out conveyor 33 has sprockets 33A at both ends thereof, and is configured to be swingable around the sprocket 33A on the second conveyance path 12 side as shown in FIG.
Here, in the present embodiment, the second suction conveyance device 14 is a single can discharge mechanism that discharges only the fall cans, and the carry-out conveyor 33 is a multiple can discharge mechanism that discharges the fall cans and the surrounding can bodies 50. Has been.

  That is, in the second suction conveyance device 14, the can body 50 that has been overturned is not adsorbed by the suction surface 14 </ b> A, but is dropped and eliminated below the second suction conveyance device 14. Only cans will be eliminated. On the other hand, in the carry-out conveyor 33, all the cans 50 discharged from the drying unit 30 are eliminated below the carry-out conveyor 33 by swinging downward with the sprocket 33A on the second conveyance path 12 side as the center. It will be.

Next, a can cleaning method using the can cleaning apparatus 10 according to the present embodiment will be described.
From the upstream side of the first conveyance path 11 (left side in FIG. 1), a can 50 formed by DI processing and having lubricant or the like attached to the surface is loaded. The can body 50 is conveyed in a state where the can bottom portion 53 is directed upward, and the primary cleaning unit 21, the secondary cleaning unit 22, the degreasing unit 23, the primary rinse unit 24, the chemical conversion unit 25, It is cleaned and surface-treated by the secondary rinsing unit 26, and is transferred to the second transfer path 12 by the first suction transfer machine 13.
At this time, the fall can generated in the first transport path 11 is not sucked by the first suction transport machine 13 and is not normally transferred to the second transport path 12. However, in some rare cases, a fall can may be sandwiched between the can body 50 and the can body 50 that are erected and sucked, and may flow out to the second conveyance path 12.

The can 50 transferred to the second transport path 12 is finally cleaned in the pure water cleaning unit 27, dried in the drying unit 30, transferred onto the carry-out conveyor 33, and then transferred to the subsequent process by the second suction transfer machine 14. And transferred.
Here, the fall can is not detected by the first fall can detection unit 41 arranged at the loading port 31 of the drying unit 30, and the second fall can detection unit 42 arranged at the discharge port 32 of the drying unit 30. If only a can is detected, it is determined that a can has occurred inside the drying unit 30. Therefore, the carry-out conveyor 33 remains at a predetermined position, and only the overturned can is removed by the second suction transfer machine 14 (single can discharge mechanism).

  On the other hand, when the fall can is detected by the first fall can detection unit 41 disposed at the loading port 31 of the drying unit 30, the fall can is removed from the washing unit 20 (primary washing unit 21 and secondary washing unit 22). The degreasing treatment unit 23, the primary rinsing unit 24, the chemical conversion treatment unit 25, the secondary rinsing unit 26, and the pure water cleaning unit 27) are determined to be generated. There is a possibility that the processing liquid or the like is accumulated inside the fall can and contaminates the can body around the fall can. Therefore, when a fall can is detected by the first fall can detection unit 41, the position of the fall can is calculated by considering the transfer time and detecting the fall can by the second fall can detection unit 42. Then, the carry-out conveyor 33 (multiple can discharge mechanism) is swung downward to eliminate all of the can bodies 50 discharged from the drying unit 30. And when the influence of the contamination by the falling can disappears, the carry-out conveyor 33 returns to the predetermined position.

  According to the can cleaning apparatus 10 and the can cleaning method of the present embodiment configured as described above, the first falling can detection unit 41 is disposed at the inlet 31 of the drying unit 30, and the discharge of the drying unit 30 is performed. Since the second falling can detection unit 42 is disposed at the outlet 32, the falling can generated in the cleaning unit 20 and the falling can generated inside the drying unit 30 can be distinguished and detected.

Here, as described above, since the processing liquid or the like remains in the falling can generated in the cleaning unit 20 and may contaminate the can body 50 around the falling can, the carry-out conveyor 33 (multiple can discharge mechanism) ) Is swung downward, it is possible to eliminate all of the can 50 discharged from the drying unit 30. Thereby, the contaminated can body 50 does not flow out to the subsequent process.
On the other hand, since the falling can generated in the drying unit 30 is not likely to contaminate the surrounding can body 50, only the falling can is excluded by the second suction conveyance device 14 (single can discharge mechanism). Thereby, it is not necessary to eliminate the can body 50 which is not likely to be contaminated more than necessary, and the yield of the can body 50 can be improved. In addition, even if the second can is transported in a state where the fall can is sandwiched between the can 50 and the can 50 sucked up and sucked by the second suction transfer machine 14, and the fall can is transferred to the subsequent process, Since the falling can is generated in the drying unit 30, there is no possibility of contaminating other normal can bodies 50.

  Moreover, in this embodiment, since the 1st falling can detection part 41 and the 2nd falling can detection part 42 are the optical area sensors extended in the width direction of the 2nd conveyance path 12, it passes under the optical area sensor. It becomes possible to monitor all the cans 50 on the second conveyance path 12 to be performed, and it is possible to reliably detect the overturned can. Furthermore, in this embodiment, the 1st fall can detection part 41 and the 2nd fall can detection part 42 are the light receiver 43 which oscillates infrared light, and the light receiver which detects the infrared light reflected by the can body 50. 44, and the positions of the light projector 43 and the light receiver 44 so that the infrared light oscillated from the light projector 43 is detected by the light receiver 44 when a falling can occurs. Since the angle is adjusted, the canister can be detected accurately and quickly.

  Furthermore, in this embodiment, the 1st suction conveyance machine 13 is provided between the 1st conveyance path 11 and the 2nd conveyance path 12, and the pure water washing | cleaning part 27 and the drying part 30 are provided in the 2nd conveyance path 12. Therefore, the overturning can generated in the first conveyance path 11 is eliminated with a certain probability by the first suction conveyance machine 13. Therefore, it is possible to suppress the degreasing treatment liquid, the chemical conversion treatment liquid, and the like, which have a large influence of contamination, on the second conveyance path 12 side, and to suppress the contamination of the second conveyance path 12.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, the configuration of the cleaning unit and the configurations of the first transport path and the second transport path are not limited to the present embodiment, and can be set as appropriate according to the can body to be cleaned.

  In addition, when the first can detection unit detects a fall can, the multiple can discharge mechanism discharges the cans, and when only the second fall can detection unit detects a fall can, the single can discharge mechanism You may provide the fall can discharge | emission judgment part which transmits instruction | command so that a can may be discharged | emitted. For example, when a fall can is detected by the first fall can detection unit, a signal such as a patrol light or an alarm may be transmitted to instruct the operator to operate the multiple can discharge mechanism. The multiple can discharge mechanism may be operated by automatic control.

Furthermore, although demonstrated as what applied the suction conveyance machine (2nd suction conveyance machine) as a single can discharge | emission mechanism, it is not limited to this, What is necessary is just a mechanism which discharges only a fall can.
Moreover, although demonstrated as what applied the swingable carrying-out conveyor as a multiple can discharge | emission mechanism, it is not limited to this, The carrying-out conveyor which can be raised / lowered may be sufficient, and a fixed amount of can bodies can be attached. You may extrude from a conveyance path.

It is the schematic of the can washing | cleaning apparatus which is embodiment of this invention. It is an expansion explanatory view near the drying part of the can washing | cleaning apparatus shown in FIG. FIG. 3 is a top view of FIG. 2. It is explanatory drawing of a 1st falling can detection part and a 2nd falling can detection part. It is sectional drawing of the can body wash | cleaned with the can washing | cleaning apparatus which is embodiment of this invention.

Explanation of symbols

14 Second suction transfer machine (single can discharge mechanism)
20 Washing section 30 Drying section 31 Loading port 32 Discharging port 33 Unloading conveyor (multiple can discharging mechanism)
41 First fall can detector 42 Second fall can detector 50 Can body

Claims (5)

A can cleaning device for transporting a can body having a bottomed cylindrical shape in a state where the can axis direction is erected in the vertical direction and cleaning the surface of the can body,
A cleaning unit for supplying and cleaning the treatment liquid to the can body, and a drying unit for drying the cleaned can body,
A first falling can detection unit for detecting a falling can is disposed at the loading port of the drying unit, and a second falling can detection unit for detecting the falling can is disposed at an outlet of the drying unit. And
The can cleaning device, wherein the discharge port is provided with a single can discharge mechanism for discharging only the fall can and a multiple can discharge mechanism for discharging the fall can and its surrounding cans.   When a fall can is detected by the first fall can detection unit, the fall can and its surrounding cans are discharged by the multiple can discharge mechanism, and the fall can is detected only by the second fall can detection unit. 2. The can cleaning apparatus according to claim 1, further comprising a fall can discharge determination unit that transmits a command to discharge the fall can by a single can discharge mechanism.   3. The can cleaning apparatus according to claim 1, wherein at least one of the first falling can detection unit and the second falling can detection unit is an optical area sensor. 4.   The can cleaning apparatus according to any one of claims 1 to 3, wherein the single-can discharge mechanism is a suction transfer machine that sucks and transfers the raised can body. A can cleaning method using the can cleaning device according to any one of claims 1 to 4,
When a fall can is detected by the first fall can detection unit disposed at the charging port of the drying unit, the fall can and its surrounding cans are discharged by the multiple can discharge mechanism, and the second A can cleaning method, wherein when a fall can is detected only by the fall can detection unit, the fall can is discharged by a single can discharge mechanism.

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