Automatic picking device and method of using the same

Abstract

The present invention relates to the technical field of picking equipment, and in particular, to an automatic picking equipment, including a scanning unit and a sorting unit, wherein the sorting unit performs corresponding sorting actions according to the scanning results of the scanning unit, and the scanning unit includes a first conveyor belt and a scanner; the first conveyor belt is a transparent structure, and the first conveyor belt at least includes a horizontal conveying surface, and the first conveyor belt has an installation space inside; the scanner is arranged in the installation space, and the scanning end of the scanner is upwardly facing the horizontal conveying surface of the first conveyor belt; the picking equipment also includes a cleaning unit for cleaning the barcode surface of the cargo box. The scanner can scan and identify the bottom of the cargo box, so that no matter how high the cargo box is, the distance between the barcode surface of the cargo box and the scanner is always the same, so there is no need to adjust the position of the scanner. Moreover, the barcode scanner is hidden under the first conveyor belt, so that the barcode scanner is difficult to be hit by foreign objects.

Description

Technical Field

[0001] The present invention relates to the technical field of picking equipment, and in particular, to an automatic picking equipment and a method for using the same. Background Art

[0002] Picking equipment, also known as sorting equipment, is mainly used in the logistics industry to sort cargo boxes, usually using scanners to scan and identify them for automatic sorting.

[0003] For example, the application number is CN201811576314.0, which is an automatic logistics sorting device, comprising a frame, a main conveyor belt arranged on the frame, discharge ports are arranged at intervals on both sides of the frame, one end of the frame is an input port, a code scanner is arranged at the input port, a push plate for pushing goods is arranged at the discharge port, a cylinder is arranged on the side of the push plate away from the discharge port, a fixed plate is connected to the piston rod of the cylinder, and a plurality of buffers are connected between the fixed plate and the push plate. The present invention has the effect of preventing the goods packaging from being damaged during sorting.

[0004] Although automatic sorting can be achieved in the above scheme, in actual use, since the barcode scanner is exposed above the conveyor belt, it is easy to be damaged by collision. In addition, the heights of different cargo boxes are different, making it difficult for the barcode scanner to focus and scan more accurately, so there is still room for improvement. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an automatic picking device and a method for using the same.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] An automatic picking device includes a scanning unit and a sorting unit, wherein the sorting unit performs corresponding sorting actions according to the scanning results of the scanning unit, and the scanning unit includes a first conveyor belt and a scanner; the first conveyor belt is a transparent structure, and the first conveyor belt at least includes a horizontal conveying surface, and the first conveyor belt has an installation space inside; the scanner is arranged in the installation space, and the scanning end of the scanner is upward toward the horizontal conveying surface of the first conveyor belt; the picking device also includes a cleaning unit for cleaning the barcode surface of the cargo box.

[0008] The advantages of adopting this solution are:

[0009] First, in this solution, the first conveyor belt is set as a transparent structure, and the scanner is placed below the horizontal conveying surface of the first conveyor belt. In this way, the barcode side of the goods is placed on the first conveyor belt facing down, and the scanner can scan and identify the bottom. In this way, no matter how high the cargo box is, the distance between the barcode side of the cargo box and the scanner is always the same, so there is no need to adjust the position of the scanner. In addition, the barcode scanner is hidden under the first conveyor belt, so it is difficult for the barcode scanner to be hit by foreign objects.

[0010] Secondly, in this solution, a cleaning unit is also provided, so that the barcode surface at the bottom of the cargo box can be cleaned by the cargo box scanner to remove dust attached to the barcode and prevent the dust from interfering with subsequent scanning work.

[0011] Furthermore, the cleaning unit includes a second conveyor belt arranged on the feeding side of the first conveyor belt, and a pushing mechanism; the conveying direction of the second conveyor belt is opposite to the conveying direction of the first conveyor belt; the pushing mechanism includes a first detection member and an actuator for pushing the cargo box, and when the cargo box is conveyed to the position of the first detection member along the second conveyor belt, the first detection member is triggered, and the actuator responds to the first detection member to push the cargo box onto the first conveyor belt.

[0012] Furthermore, the actuator includes a push plate disposed above the second conveyor belt, and a driving member connected to the push plate for driving the push plate to move along the length direction of the conveyor belt; the first detection member is disposed on the inner side of the push plate.

[0013] Furthermore, a plurality of infrared sensors are provided on both sides of the second conveyor belt, and when the infrared sensors sense human body signals, the driving member stops moving.

[0014] Furthermore, the second conveyor belt includes accommodating grooves arranged on both sides of the second conveyor belt and with the grooves facing upward; the infrared sensor is arranged in the accommodating groove, and a transparent cover plate covering the groove is provided at the groove.

[0015] Furthermore, the cleaning unit includes a second conveyor belt arranged on the cargo feeding side of the first conveyor belt, and a baffle fixedly installed on the end of the second conveyor belt away from the first conveyor belt to block the cargo box; a second detection member is provided on the baffle, and when the cargo box abuts against the baffle, the second detection member is triggered; the cleaning unit also includes a timer, and a controller electrically connected to the second conveyor belt and the second detection member, and when the second detection member is triggered, the timer starts timing, and when the timer reaches a preset time, the controller controls the second conveyor belt to reverse.

[0016] Furthermore, the cleaning unit also includes a third detection member electrically connected to the controller; the third detection member is arranged on the second conveyor belt, and when the cargo box is located in the scanning area, the controller controls the second conveyor belt to rotate forward.

[0017] Furthermore, the cleaning unit also includes a dust removal component for cleaning the second conveyor belt; the dust removal component includes a roller brush rotatably connected to the bottom of the second conveyor belt for cleaning the outer surface of the second conveyor belt, and a driving motor for driving the roller brush to rotate.

[0018] Furthermore, the dust removal assembly also includes a dust hood fixedly mounted on the bottom of the second conveyor belt and open at the upper end, and a suction fan; the roller brush is located inside the dust hood, and the air inlet end of the suction fan is connected to the dust hood through an air duct.

[0019] This solution also provides a method for using the automatic picking device described in the above solution, comprising the following steps:

[0020] S1. Place the barcode side of the cargo box facing downward on the cleaning unit, and clean the barcode side of the cargo box through the cleaning unit;

[0021] S2, the cleaned cargo box is transported to the first conveyor belt and driven forward by the first conveyor belt. When the cargo box moves to the scanning area of ​​the scanner, the barcode at the bottom of the cargo box is scanned and identified by the scanner, and the cargo box continues to move forward to the sorting unit;

[0022] S3. The sorting unit sorts the cargo boxes according to the scanning results of the scanner.

[0023] Other advantages and effects of this solution are described in detail in the specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0025] Figure 2 It is a schematic diagram of the internal structure of Example 1;

[0026] Figure 3 for Figure 1 Enlarged view of part A in the middle;

[0027] Figure 4 This is a schematic diagram of the cleaning unit structure of Example 2;

[0028] Figure 5 This is a schematic diagram of the internal structure of the cleaning unit of Example 2. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0030] Embodiment 1:

[0031] like Figure 1As shown, this embodiment provides an automatic picking device, including a scanning unit 1 and a sorting unit 2, wherein the sorting unit 2 performs corresponding sorting actions according to the scanning result of the scanning unit 1.

[0032] Specifically, the sorting unit 2 includes a sorting conveyor belt 21, which is arranged on the delivery side of the scanning unit 1; a plurality of delivery channels 22 are arranged on one side of the frame of the sorting conveyor belt 21, and a plurality of pushing cylinders 23 are fixedly installed on the side opposite to the delivery channels 22, and a pushing plate 24 is installed on the shaft end of the pushing cylinder 23. After the scanning unit 1 scans the goods, when the goods move to the corresponding position of the pushing cylinder 23 on the sorting conveyor belt 21, the pushing cylinder 23 pushes the cargo box to the corresponding delivery channel 22 through the pushing plate 24 to realize picking.

[0033] Combination Figure 2 As shown, the scanning unit 1 includes a first conveyor belt 11 and a scanner 12; the first conveyor belt 11 is a transparent structure as a whole to ensure that the scanner 12 can scan through the belt surface of the first conveyor belt 11; the first conveyor belt 11 includes at least one horizontal conveying surface, and the first conveyor belt 11 has an installation space inside, and the installation space is mainly used to install the scanner 12; the scanner 12 is arranged in the installation space, and the scanning end of the scanner 12 is upward toward the horizontal conveying surface of the first conveyor belt 11; specifically, a mounting beam 10 is fixedly installed in the installation space, and the scanner 12 is installed on the mounting beam 10. In order to provide fill light for the scanner 12 to scan, in this embodiment, a fill light 13 can also be installed on the mounting beam 10.

[0034] The picking device also includes a cleaning unit for cleaning the barcode surface of the cargo box.

[0035] First, in this solution, the first conveyor belt 11 is set as a transparent structure, and the scanner 12 is placed below the horizontal conveying surface of the first conveyor belt 11. In this way, the goods only need to be placed with the barcode side facing down on the first conveyor belt, and the scanner 12 can scan and identify the bottom. In this way, no matter how high the cargo box is, the distance between the barcode surface of the cargo box and the scanner 12 is always consistent, so there is no need to adjust the position of the scanner 12.

[0036] Secondly, in this solution, a cleaning unit is also provided, so that the barcode surface at the bottom of the cargo box can be cleaned by the cargo box scanner 12 to remove dust attached to the barcode and prevent the dust from interfering with subsequent scanning work.

[0037] In order to achieve automatic cleaning, in this embodiment, Figure 2As shown, the cleaning unit includes a second conveyor belt 31 arranged on the feeding side of the first conveyor belt 11, and a pushing mechanism; the conveying direction of the second conveyor belt 31 is opposite to that of the first conveyor belt 11, for example, the delivery direction of the first conveyor belt 11 is leftward, and the delivery direction of the second conveyor belt 31 is rightward; the pushing mechanism includes a first detection member 32 and an actuator 33 for pushing the cargo box, when the cargo box is conveyed to the position of the first detection member 32 along the second conveyor belt 31, the first detection member 32 is triggered, and the actuator 33 responds to the first detection member 32 to push the cargo box onto the first conveyor belt 11.

[0038] Through the above arrangement, when the cargo box is placed on the second conveyor belt 31, the second conveyor belt 31 drives the cargo box to move toward the side of the pushing mechanism until it moves to the position of the first detection member 32, and the actuator 33 pushes the cargo box to move in the direction of the first conveyor belt 11. During this process, the second conveyor belt 31 continues to move in the original conveying direction; in the process of the actuator 33 pushing the cargo box forward on the second conveyor belt 31, the bottom of the cargo box (not the bottom in the actual sense, but the side with the barcode) rubs against the surface of the second conveyor belt 31, so that the second conveyor belt 31 can wipe off the dust on the barcode to ensure the subsequent scanning effect. Moreover, while the executing part 33 pushes the goods box, the second conveyor belt 31 still keeps moving in the original direction, which is equivalent to a moving dust removal part performing moving dust removal, which can improve the dust removal effect. In other words, assuming that the second conveyor belt 31 remains stationary while the executing part 33 pushes the goods, only the upper belt surface of the second conveyor belt 31 can bear the dust removal effect, but the moving second conveyor belt 31 in this embodiment is not the case. It can maintain a continuous motion state, so that the entire outer belt surface of the second conveyor belt 31 can bear the dust removal task, which can undoubtedly improve the dust removal effect.

[0039] The second conveyor belt 31 is arranged to have a conveying direction opposite to that of the first conveyor belt 11. Another purpose is that no matter where the cargo box is placed on the second conveyor belt 31, the second conveyor belt 31 can eventually transport it to the position of the first detection member 32, so that when the actuator 33 pushes the cargo box, it has enough movement stroke to rub against the second conveyor belt 31 for dust removal.

[0040] Of course, in order to achieve a good dust removal effect, the second conveyor belt 31 can be set to a two-layer structure (not shown in the figure), an inner belt layer and an outer belt layer fixed to the outside of the inner belt layer. The outer belt layer can be composed of one of dust-free cloth, cotton cloth, and wool cloth. In this way, the outer belt layer can be used for friction dust removal, and the inner belt layer is responsible for driving the outer belt layer to rotate.

[0041] In this embodiment, Figure 2As shown, the actuator 33 includes a push plate 332 disposed above the second conveyor belt 31, and a driving member 331 connected to the push plate 332 to drive the push plate 332 to move along the length direction of the conveyor belt; the first detection member 32 is disposed on the inner side of the push plate 332. The actuator 33 can be a driving cylinder or a linear servo module (such as a screw nut structure). The present embodiment shows a driving cylinder, which is mounted on the end of the second conveyor belt 31 away from the first conveyor belt 11 and fixed to the push plate 332. The push plate 332 is driven forward by the action of the driving cylinder to achieve the purpose of pushing the delivery box. The first detection member 32 can be a proximity sensor, a proximity switch, etc., which is embedded on the inner wall of the push plate 332. When the cargo box rests against the push plate 332, the first detection member 32 is triggered, thereby driving the cylinder to extend and push the cargo box onto the first conveyor belt 11. At this time, the goods are driven forward by the first conveyor belt 11. At this time, the cargo box is separated from the push plate 332, and the trigger signal of the first detection member 32 disappears, driving the cylinder to reset and prepare for the next action.

[0042] If a human hand is placed in the pushing path when the driving cylinder is pushing the delivery box, it is easy to be squeezed by the driving cylinder, causing a safety accident. Therefore, this embodiment is further improved. A plurality of infrared sensors 312 are provided on both sides of the second conveyor belt 31. When the infrared sensor 312 senses a human body signal, the driving member 331 stops moving.

[0043] Specific, combined Figure 1 and Figure 3 As shown, the upper ends of the racks on both sides of the second conveyor belt 31 are provided with receiving slots 311 with notches facing upwards, and the infrared sensor 312 is arranged in the receiving slot 311. The notch of the receiving slot 311 is provided with a transparent cover plate (not shown in the figure) covering the notch, and the infrared sensor in the slot is protected by the transparent cover plate. In this way, the upper parts of the two racks are equivalent to forming a virtual warning wall. When a human hand is located above the receiving slot 311, that is, passing through the warning wall, the infrared sensor is triggered, causing the driving cylinder to stop moving, so as to prevent the cylinder from continuing to move and causing danger.

[0044] Due to the long-term use of the second conveyor belt 31, a lot of dust will be attached to its outer surface, which will affect the subsequent dust removal effect. Figure 2 As shown, the cleaning unit also includes a dust removal component for cleaning the second conveyor belt 31; the dust removal component includes a roller brush 41 rotatably connected to the bottom of the second conveyor belt 31 for cleaning the outer surface of the second conveyor belt 31, and a driving motor (not shown in the figure) for driving the roller brush 41 to rotate. In this way, during the rotation of the second conveyor belt 31, the driving motor will drive the roller brush 41 to rotate continuously, so that the roller brush 41 continuously cleans the outer surface of the second conveyor belt 31, so as to reduce the amount of dust on the second conveyor belt 31 and ensure the subsequent dust removal effect.

[0045] In order to prevent the dust removed by the roller brush 41 from scattering, in this embodiment, the dust removal assembly also includes a dust hood 42 fixedly mounted on the bottom of the second conveyor belt 31 and open at the upper end, and a suction fan 43; the roller brush 41 is located inside the dust hood 42, and the air inlet end of the suction fan 43 is connected to the dust hood 42 through an air duct 44, so that the dust swept by the roller brush 41 will be absorbed by the suction hood and then discharged outward by the suction fan 43.

[0046] The method of using this embodiment is:

[0047] S1. Place the barcode side of the cargo box facing downward on the cleaning unit, and clean the barcode side of the cargo box through the cleaning unit;

[0048] S2, the cleaned cargo box is transported to the first conveyor belt 11, and is driven forward by the first conveyor belt 11. When the cargo box moves to the scanning area of ​​the scanner 12, the barcode at the bottom of the cargo box is scanned and identified by the scanner 12, and the cargo box continues to move to the sorting unit 2;

[0049] S3. The sorting unit 2 sorts the cargo boxes according to the scanning result of the scanner 12.

[0050] Embodiment 2,

[0051] This embodiment is improved on the basis of the embodiment 1, and the difference from the embodiment 1 is only in the cleaning unit. Specifically, in this embodiment, Figure 4 As shown, the cleaning unit includes a second conveyor belt 31 arranged on the cargo feeding side of the first conveyor belt 11, and a baffle 34 fixedly installed on the end of the second conveyor belt 31 away from the first conveyor belt 11 to block the cargo box; in the initial state, the conveying direction of the second conveyor belt 31 is opposite to the conveying direction of the first conveyor belt 11.

[0052] The baffle 34 is provided with a second detection member 35, which can be a proximity switch or a proximity sensor. When the cargo box abuts against the baffle 34, the second detection member 35 is triggered; the cleaning unit also includes a timer (a 555 timing chip can be used), and a controller electrically connected to the second conveyor belt 31 and the second detection member 35. When the second detection member 35 is triggered, the timer starts timing. When the timer reaches a preset time, such as 3 seconds, the controller controls the second conveyor belt 31 to reverse. The reversal here refers to the direction opposite to the initial conveying direction of the second conveyor belt 31.

[0053] When in use, the cargo box is placed on the second conveyor belt 31. At this time, the second conveyor belt 31 drives the cargo box to be transported to the side of the baffle 34. Finally, the cargo box will be against the baffle 34 under the obstruction of the baffle 34, and then triggered by the second detection member 35. At this time, the timer starts timing. During the timing period of the timer, the second conveyor belt 31 continues to maintain the original direction of transportation, while the cargo box cannot move due to being blocked by the baffle 34. At this time, the second conveyor belt 31 can move relative to the bottom of the cargo box, constantly rubbing the bottom of the cargo box to remove dust from the bottom of the cargo box. When the timer ends, the controller controls the second conveyor belt 31 to reverse, that is, drive the cargo box to be transported to the side of the first conveyor belt 11, and finally transport it to the first conveyor belt 11 for transportation scanning.

[0054] In order to enable the second conveyor belt 31 to automatically restore to its initial state for the next action after conveying the cargo box, in this embodiment, Figure 4 As shown, the cleaning unit also includes a third detection member 36 electrically connected to the controller; the third detection member 36 is arranged on the second conveyor belt 31, and when the cargo box is located in the scanning area, the controller controls the second conveyor belt 31 to rotate forward, and the forward rotation here refers to the conveying direction of the second conveyor belt 31 in the initial state, that is, the conveying direction opposite to the first conveyor belt 11, so as to provide dust removal for the next cargo box.

[0055] Specifically, the third detection component 36 includes a transmitting end 361 for emitting infrared light and a receiving end 362 for receiving the infrared light. The receiving end 362 and the transmitting end 361 are respectively arranged in the middle of both sides of the first conveyor belt 11. The receiving end 362 is connected to the controller. When the receiving end 362 does not receive the infrared light emitted by the transmitting end 361, the controller controls the second conveyor belt 31 to rotate forward; in this way, when the cargo box is conveyed to the position between the transmitting end 361 and the receiving end 362 with the first conveyor belt 11, the cargo box will block the infrared light emitted by the transmitting end 361, making it impossible for the receiving end 362 to receive it, and then the controller controls the second conveyor belt 31 to rotate forward.

[0056] Of course, the second conveyor belt 31 in this embodiment can also be set to a two-layer structure, an inner belt layer and an outer belt layer fixed to the outside of the inner belt layer. The outer belt layer can be composed of one of dust-free cloth, cotton cloth, and wool cloth. In this way, the outer belt layer can be used for friction dust removal, and the inner belt layer is responsible for driving the outer belt layer to rotate.

[0057] In this embodiment, the cleaning unit further includes a dust removal component for cleaning the second conveyor belt 31. The structure of the dust removal component in this embodiment is the same as that of the dust removal component in Embodiment 1. Specifically, Figure 5As shown, the dust removal assembly includes a roller brush 41 rotatably connected to the bottom of the second conveyor belt 31 for cleaning the outer surface of the second conveyor belt 31, and a driving motor for driving the roller brush 41 to rotate. In this way, when the second conveyor belt 31 rotates, the driving motor will drive the roller brush 41 to rotate continuously, so that the roller brush 41 continuously cleans the outer surface of the second conveyor belt 31, so as to reduce the amount of dust on the second conveyor belt 31 and ensure the subsequent dust removal effect.

[0058] The dust removal assembly also includes a dust hood 42 fixedly mounted on the bottom of the second conveyor belt 31 and open at the upper end, and a suction fan 43; the roller brush 41 is located inside the dust hood 42, and the air inlet end of the suction fan 43 is connected to the dust hood 42 through an air duct 44, so that the dust swept by the roller brush 41 will be absorbed by the suction hood and then discharged outward by the suction fan 43.

[0059] The above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the scope of protection required by the present invention.

Claims

1. An automatic picking device, comprising a scanning unit and a sorting unit, wherein the sorting unit performs corresponding sorting actions according to the scanning result of the scanning unit, characterized in that: The scanning unit includes a first conveyor belt and a scanner; the first conveyor belt is a transparent structure, and the first conveyor belt includes at least one horizontal conveying surface, and the first conveyor belt has an installation space inside; the scanner is arranged in the installation space, a mounting beam is fixedly installed in the installation space, the scanner is installed on the mounting beam, and the scanning end of the scanner is upwardly facing the horizontal conveying surface of the first conveyor belt; the picking device also includes a cleaning unit for cleaning the barcode surface of the cargo box; The cleaning unit includes a second conveyor belt arranged on the feeding side of the first conveyor belt, and a pushing mechanism; the conveying direction of the second conveyor belt is opposite to that of the first conveyor belt; the pushing mechanism includes a first detection member and an actuator for pushing the cargo box, when the cargo box is conveyed to the position of the first detection member along the second conveyor belt, the first detection member is triggered, and the actuator responds to the first detection member to push the cargo box onto the first conveyor belt.

2. The automatic picking device according to claim 1, characterized in that: The actuator includes a push plate disposed above the second conveyor belt, and a driving member connected to the push plate for driving the push plate to move along the length direction of the conveyor belt; the first detection member is disposed on the inner side of the push plate.

3. The automatic picking device according to claim 2, characterized in that: A plurality of infrared sensors are arranged on both sides of the second conveyor belt. When the infrared sensors sense human body signals, the driving member stops moving.

4. The automatic picking device according to claim 3, characterized in that: The second conveyor belt comprises accommodating grooves arranged on both sides of the second conveyor belt with the groove openings facing upwards; the infrared sensor is arranged in the accommodating groove, and a transparent cover plate covering the groove opening is arranged at the groove opening of the accommodating groove.

5. The automatic picking device according to claim 3, characterized in that: The cleaning unit further comprises a third detection member electrically connected to the controller; the third detection member is arranged on the second conveyor belt, and when the cargo box is located in the scanning area, the controller controls the second conveyor belt to rotate forward.

6. An automatic picking device according to any one of claims 1 to 5, characterized in that: The cleaning unit also includes a dust removal component for cleaning the second conveyor belt; the dust removal component includes a roller brush rotatably connected to the bottom of the second conveyor belt for cleaning the outer belt surface of the second conveyor belt, and a driving motor for driving the roller brush to rotate.

7. The automatic picking device according to claim 6, characterized in that: The dust removal assembly also includes a dust hood fixedly mounted on the bottom of the second conveyor belt and open at the upper end, and a suction fan; the roller brush is located inside the dust hood, and the air inlet end of the suction fan is connected to the dust hood through an air duct.

8. An automatic picking device, characterized in that: The device comprises a scanning unit and a sorting unit, wherein the sorting unit performs corresponding sorting actions according to the scanning result of the scanning unit, and is characterized in that the scanning unit comprises a first conveyor belt and a scanner; the first conveyor belt is a transparent structure, and the first conveyor belt comprises at least one horizontal conveying surface, and the first conveyor belt has an installation space inside; the scanner is arranged in the installation space, a mounting beam is fixedly installed in the installation space, the scanner is installed on the mounting beam, and the scanning end of the scanner is upwardly facing the horizontal conveying surface of the first conveyor belt; the picking device also comprises a cleaning unit for cleaning the barcode surface of the cargo box; The cleaning unit includes a second conveyor belt arranged on the feeding side of the first conveyor belt, and a baffle fixedly installed on the end of the second conveyor belt away from the first conveyor belt to block the cargo box; a second detection member is provided on the baffle, and when the cargo box abuts against the baffle, the second detection member is triggered; the cleaning unit also includes a timer, and a controller electrically connected to the second conveyor belt and the second detection member, when the second detection member is triggered, the timer starts timing, and when the timer reaches a preset time, the controller controls the second conveyor belt to reverse; in the initial state, the conveying direction of the second conveyor belt is opposite to that of the first conveyor belt.

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