A necking machine can blank orientation identification device

Abstract

This utility model relates to the technical field of beverage can production equipment, specifically a can blank orientation identification device for a necking machine. It includes a frame, a conveying mechanism, an adsorption mechanism, and a detection device. The conveying mechanism includes a conveying shell and a star wheel. The adsorption mechanism includes a turntable, a lifting drive device, and a negative pressure suction cup. The detection device detects the opening direction of the can blank. When a can blank with its opening facing downwards is detected, the negative pressure suction cup descends under the action of the lifting drive device and adsorbs the can blank. Subsequently, the turntable rises to disengage the can blank from the slot and releases it when rotating to the rejection station, thus rejecting inverted can blanks. Because the star wheel and turntable are continuously rotated by a drive motor, continuous identification of the can blank orientation and continuous rejection of inverted can blanks are achieved. This facilitates continuous necking processing of can blanks with a necking machine, improving production efficiency and ensuring the accuracy and quality of the necking process.

Description

Technical Field

[0001] This utility model relates to the technical field of beverage can production equipment, and in particular to a device for identifying the orientation of can blanks in a necking machine. Background Technology

[0002] In the production process of aluminum cans, the necking machine is a key piece of equipment for necking the can opening. During the feeding process of the necking machine, the opening of the aluminum can blank must face the mold, and the bottom of the can must face the push plate. Only in this way can the necking operation be performed correctly.

[0003] However, in existing technologies, there is a small probability that the can blanks on the feeding conveyor of the necking machine will be inverted, with the can bottom facing the mold and the can opening facing the pusher. If such inverted blanks enter the necking process, it will lead to processing errors, affect product quality, and even cause equipment failure. Currently, there is a lack of a device in existing technologies that can effectively and continuously detect and remove inverted can blanks, making it difficult to meet the continuous processing requirements of the necking machine. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a necking machine can blank orientation identification device, which can accurately detect the orientation of the can blank, promptly remove blanks with the can opening and bottom reversed, ensure the correct feeding of the necking machine, and improve production efficiency and product quality.

[0005] To achieve the above objectives, this utility model provides a necking machine can blank orientation identification device, including a frame, a conveying mechanism, an adsorption mechanism, and a detection device. The conveying mechanism includes a conveying housing and a star wheel. The conveying housing is mounted on the frame and has an inlet channel and an outlet channel. The star wheel has several evenly distributed slots on its edge for accommodating the can blank. The star wheel rotates to convey the can blank from the inlet channel to the outlet channel along the conveying path. The detection device is mounted on the conveying housing with its detection end located on the conveying path of the can blank, and is used to detect the can blank. The opening orientation is as follows: The adsorption mechanism includes a turntable, a lifting drive device, and a negative pressure suction cup. The turntable rotates synchronously with the star wheel, and their rotation center lines are coaxial. The negative pressure suction cup is installed on the turntable and connected to the negative pressure source. The negative pressure suction cup corresponds to the slot one by one. The turntable is driven to rise and fall by the lifting drive device. When the turntable descends to the lower stop point, the negative pressure suction cup can adsorb the top of the can blank with the opening facing downward in the corresponding slot. When the turntable rises to the upper stop point, the negative pressure suction cup can move the adsorbed can blank to a height higher than the top of the star wheel, so that the can blank can detach from the slot.

[0006] Preferably, the conveying mechanism further includes a drive motor and a splined shaft. The drive motor is mounted on the frame, and the splined shaft is rotatably mounted on the conveying housing via a first bearing. The output end of the drive motor is connected to the splined shaft for transmission, and the star wheel is fixedly mounted on the splined shaft.

[0007] Preferably, the adsorption mechanism further includes a spline sleeve, which is fitted onto the spline shaft and key-connected to the spline shaft.

[0008] Preferably, the adsorption mechanism further includes a second bearing and a ring plate. The ring plate is rotatably connected to the turntable via the second bearing. The second bearing and the turntable are coaxially arranged. The lifting drive device is mounted on the frame, and the output end of the lifting drive device is connected to the ring plate.

[0009] Preferably, the adsorption mechanism further includes a multi-port rotary joint, through which the negative pressure suction cup is connected to a negative pressure source.

[0010] Preferably, the adsorption mechanism further includes a branch rotating negative pressure tube, a branch fixed negative pressure tube, a main negative pressure tube, and a main control valve. The branch rotating negative pressure tube and the branch fixed negative pressure tube correspond one-to-one with the negative pressure suction cup. The negative pressure suction cup is connected to the rotating end interface of the multi-way rotary joint through the branch rotating negative pressure tube. The fixed end interface of the multi-way rotary joint is connected to the main negative pressure tube through the branch fixed negative pressure tube. The main negative pressure tube is connected to the negative pressure source. The main control valve is installed on the main negative pressure tube.

[0011] Preferably, the conveying housing includes a bottom plate, an outer protective plate, an infeed guide plate, an outfeed guide plate, and a deflector plate. The bottom plate is fixedly connected to the frame. The outer protective plate, the infeed guide plate, and the outfeed guide plate are fixedly installed on the bottom plate. An infeed channel is formed between the outer protective plate and the infeed guide plate. An outfeed channel is formed between the outer protective plate and the outfeed guide plate. The deflector plate is fixedly installed on the outfeed guide plate and located above the star wheel. The deflector plate is used to guide the can blank material in the slot to the outfeed channel.

[0012] Preferably, the outer protective plate includes a feeding straight plate, an arc plate, and a discharging straight plate connected in sequence. A feeding channel is formed between the feeding guide plate and the discharging straight plate, and a discharging channel is formed between the discharging guide plate and the discharging plate. The center line of the arc plate is coaxial with the center line of the star wheel.

[0013] Preferably, the bottom end of the conveying housing is provided with a detection hole, and the detection device is installed at the bottom end of the conveying housing, with the detection end of the detection device located inside the detection hole.

[0014] Preferably, a rejection station is provided between the discharge channel and the inlet channel along the rotation direction of the star wheel. The rejection station is located on the moving trajectory of the slot. The negative pressure of the negative pressure suction cup disappears at the rejection station, causing the tank blank material adsorbed by it to fall under gravity due to the opposite orientation.

[0015] The beneficial effects of this technical solution are as follows: The detection device detects the opening direction of the can blank. When a can blank with its opening facing downwards is detected, the negative pressure suction cup of the adsorption mechanism descends under the action of the lifting drive device and adsorbs the can blank. Subsequently, the turntable rises to disengage the can blank from the slot and releases it when rotating to the rejection station, thus achieving the rejection of inverted can blanks. Since the star wheel and turntable are driven by a drive motor to rotate continuously, inverted can blanks can be rejected without stopping. This enables continuous identification of the can blank's orientation and continuous rejection of inverted can blanks, facilitating continuous necking processing of can blanks with a necking machine, improving production efficiency, and ensuring the accuracy and quality of the necking process. Attached Figure Description

[0016] Figure 1 A perspective view of the necking machine tank blank orientation recognition device according to an embodiment;

[0017] Figure 2 A cross-sectional view of the blank orientation identification device for the necking machine tank, as shown in the embodiment;

[0018] Figure 3 A front view of the necking machine tank blank orientation identification device according to an embodiment;

[0019] Figure 4 for Figure 3 Sectional view along line AA;

[0020] Figure 5 The front view of the necking machine tank blank orientation identification device in the working state, as shown in the embodiment;

[0021] Figure 6 for Figure 3 Sectional view along line BB;

[0022] Figure 7 A schematic diagram of the connection structure of the branch fixed negative pressure pipe, the main negative pressure pipe, the main control valve and the negative pressure source of the adsorption mechanism in the embodiment;

[0023] In the diagram, 1. Frame; 2. Conveying mechanism; 21. Conveying housing; 211. Feed channel; 212. Discharge channel; 213. Base plate; 214. Outer protective plate; 2141. Feeding straight plate; 2142. Arc plate; 2143. Discharge straight plate; 215. Feeding guide plate; 216. Discharge guide plate; 217. Pulley; 22. Star wheel; 221. Slot; 23. Drive motor; 24. Splined shaft; 25. First bearing. 3. Adsorption mechanism; 301. Turntable; 302. Lifting drive device; 303. Negative pressure suction cup; 304. Spline sleeve; 305. Second bearing; 306. Ring plate; 307. Multi-port rotary joint; 308. Branch rotating negative pressure pipe; 309. Branch fixed negative pressure pipe; 310. Main negative pressure pipe; 311. Main control valve; 312. Negative pressure source; 4. Detection device; 5. Tank blank; 6. Rejection station; 7. Controller. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] Please see Figures 1 to 7 This application provides a necking machine can blank direction identification device, including a frame 1, a conveying mechanism 2, an adsorption mechanism 3, a detection device 4, and a controller 7.

[0026] The conveying mechanism 2 includes a conveying housing 21, a star wheel 22, a drive motor 23, and a splined shaft 24. The drive motor 23 is fixedly mounted on the frame 1. The splined shaft 24 is rotatably mounted on the conveying housing 21 via a first bearing 25. The output end of the drive motor 23 is connected to the splined shaft 24 via a coupling. The star wheel 22 is fixedly mounted on the splined shaft 24. The conveying housing 21 is fixedly mounted on the frame 1 and has an inlet channel 211 and an outlet channel 212. The edge of the star wheel 22 is provided with several evenly distributed slots 221 for accommodating the tank blank 5. The star wheel 22, by rotating, conveys the tank blank 5 in the inlet channel 211 along the conveying path to the outlet channel 212.

[0027] The controller 7 can be a PLC. The controller 7 controls the operation of the conveying mechanism 2 and the adsorption mechanism 3 by receiving the detection signal from the detection device 4.

[0028] After the drive motor 23 starts, its output power is transmitted to the spline shaft 24, causing the spline shaft 24 to rotate. Since the star wheel 22 is fixedly installed on the spline shaft 24, the star wheel 22 rotates synchronously. The tank blank 5 enters the slot 221 on the edge of the star wheel 22 from the feed channel 211. As the star wheel 22 rotates, the blank is transported to the discharge channel 212 along the preset path of the conveying shell 21, completing the conveying process.

[0029] The detection device 4 is installed on the conveying housing 21 and its detection end is located on the conveying path of the tank blank 5, and is used to detect the opening orientation of the tank blank 5.

[0030] Specifically, a detection hole is provided at the bottom end of the conveying housing 21, and a detection device 4 is installed at the bottom end of the conveying housing 21, with the detection end of the detection device 4 located inside the detection hole. The detection device 4 can be a photoelectric sensor, which determines the orientation of the tank opening of the tank blank 5 by detecting the distance from the end of the tank blank 5.

[0031] When the tank blank 5 rotates with the star wheel 22 and passes the detection end of the detection device 4, the photoelectric sensor emits light and receives the reflected light. The distance between the end of the tank blank 5 and the detection device 4 is determined by detecting the distance of the reflected light.

[0032] If the opening of the tank blank 5 faces upward, the distance detected by the detection device 4 is within the normal range; if the opening of the tank blank 5 faces downward, the closed end of the tank blank 5 is far away from the detection device 4, and the distance detected by the detection device 4 increases. At this time, the detection device 4 sends a detection signal to the controller 7, indicating that there is a tank blank 5 with an incorrect orientation.

[0033] The adsorption mechanism 3 includes a turntable 301, a lifting drive device 302, a negative pressure suction cup 303, a spline sleeve 304, a second bearing 305, a ring plate 306, a multi-port rotary joint 307, a branch rotating negative pressure pipe 308, a branch fixed negative pressure pipe 309, a main negative pressure pipe 310, and a main control valve 311.

[0034] In this configuration, the turntable 301 rotates synchronously with the star wheel 22 and their rotation center lines are coaxial. The spline sleeve 304 is fitted onto the spline shaft 24 and is keyed to the spline shaft 24. The turntable 301 is connected to the spline shaft 24 through the spline sleeve 304, thus achieving synchronous rotation with the star wheel 22.

[0035] Negative pressure suction cups 303 are mounted on turntables 301 and connected to negative pressure sources 312. Each negative pressure suction cup 303 corresponds to a slot 221. Annular plate 306 is rotatably connected to turntable 301 via a second bearing 305, which is coaxial with turntable 301. A lifting drive device 302 is mounted on frame 1, and its output end is connected to annular plate 306 to drive the turntable 301 to lift.

[0036] The lifting drive device 302 is a pneumatic cylinder, but it can also be an electric cylinder or a hydraulic cylinder. Two lifting drive devices 302 are configured, and the two lifting drive devices 302 work synchronously. The negative pressure source 312 is a vacuum pump or a suction pump.

[0037] When the turntable 301 descends to the lower dead center, the negative pressure suction cup 303 can adsorb the top of the can blank 5 with the opening facing downward in the corresponding slot 221; when the turntable 301 rises to the upper dead center, the negative pressure suction cup 303 can move the adsorbed can blank 5 to a height higher than the top of the star wheel 22, so that the can blank 5 can be removed from the slot 221.

[0038] The negative pressure suction cup 303 is connected to the negative pressure source 312 via a multi-way rotary joint 307. Specifically, branch rotary negative pressure pipes 308 and branch fixed negative pressure pipes 309 correspond one-to-one with the negative pressure suction cup 303. The negative pressure suction cup 303 is connected to the rotating end interface of the multi-way rotary joint 307 via the branch rotary negative pressure pipes 308. The fixed end interface of the multi-way rotary joint 307 is connected to the main negative pressure pipe 310 via the branch fixed negative pressure pipes 309. The main negative pressure pipe 310 is connected to the negative pressure source 312. The main control valve 311 is installed on the main negative pressure pipe 310. The main control valve 311 is a three-way solenoid valve. One passage of the main control valve 311 is connected to the negative pressure source 312, and the other passage is connected to the atmosphere.

[0039] Along the rotation direction of the star wheel 22, a rejection station 6 is provided between the discharge channel 212 and the inlet channel 211. The rejection station 6 is located on the moving trajectory of the slot 221. The negative pressure of the negative pressure suction cup 303 disappears at the rejection station 6, causing the tank blank 5 billet adsorbed by it to fall under gravity. A collection device or a conveying device can be set at the rejection station 6 to collect or convey the rejected tank blank 5 billet.

[0040] When the detection device 4 detects the tank blank 5 with its opening facing downwards, the controller 7 controls the lifting drive device 302 to operate, driving the ring plate 306 to lower the turntable 301, causing the negative pressure suction cup 303 to approach the top of the tank blank 5. At the same time, the controller 7 controls the main control valve 311 to open, and the negative pressure source 312 transmits negative pressure to the negative pressure suction cup 303 through the main negative pressure pipe 310, the branch fixed negative pressure pipe 309, the multi-port rotary joint 307, and the branch rotating negative pressure pipe 308, so that a negative pressure is formed at the lower end of the negative pressure suction cup 303, thereby adsorbing the top of the tank blank 5 with its opening facing downwards. The tank blank 5 with its opening facing upwards cannot be adsorbed because its top is an open structure.

[0041] Subsequently, the lifting drive device 302 drives the turntable 301 to rise, raising the adsorbed can blank 5 to a height higher than the top of the star wheel 22, causing the can blank 5 to disengage from the slot 221. As the turntable 301 rotates, when the can blank 5 rotates to the rejection station 6, the controller 7 controls the main control valve 311 to switch the passage, isolating the branch fixed negative pressure pipe 309 from the negative pressure source 312 and connecting it to the atmosphere. The negative pressure at the negative pressure suction cup 303 disappears, and the can blank 5 falls under gravity and is rejected from the device.

[0042] Since the probability of a can blank 5 with its opening facing downwards is extremely low, it is generally unlikely that two or more can blank 5 with their openings facing downwards will appear in the device. In extreme cases, if such a situation occurs, the controller 7 will control the drive motor 23 to stop working, and the shutdown will be handled manually.

[0043] In some embodiments, please refer to Figure 1 and Figure 4 The conveying housing 21 includes a base plate 213, an outer protective plate 214, an infeed guide plate 215, an outfeed guide plate 216, and a deflector plate 217. The base plate 213 is fixedly connected to the frame 1. The outer protective plate 214, the infeed guide plate 215, and the outfeed guide plate 216 are fixedly installed on the base plate 213. An infeed channel 211 is formed between the outer protective plate 214 and the infeed guide plate 215, and an outfeed channel 212 is formed between the outer protective plate 214 and the outfeed guide plate 216. The deflector plate 217 is fixedly installed on the outfeed guide plate 216 and is located above the star wheel 22. The deflector plate 217 is used to guide the tank blank 5 in the slot 221 to the outfeed channel 212.

[0044] The outer protective plate 214 includes a feeding straight plate 2141, an arc plate 2142, and a discharge straight plate 2143 connected in sequence. The feeding straight plate 2141 forms a feeding channel 211 between the feeding guide plate 215, and the discharge straight plate 2143 forms a discharge channel 212 between the discharge guide plate 216 and the discharge guide plate 216. The center line of the arc plate 2142 is coaxially arranged with the center line of the star wheel 22.

[0045] The tank blank 5 enters through the feed channel 211 and, guided by the feed guide plate 215 and the outer protective plate 214, accurately falls into the slot 221 of the star wheel 22. During the rotation of the star wheel 22, the tank blank 5 moves smoothly along the arc plate 2142 of the outer protective plate 214. When the tank blank 5 reaches the discharge position, it contacts the deflector plate 217, which guides it out of the slot 221 and into the discharge channel 212 formed by the discharge guide plate 216 and the outer protective plate 214, thus exiting the conveying mechanism 2 and completing the entire conveying process.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A necking machine can body blank orientation device characterized by, The system includes a frame (1), a conveying mechanism (2), an adsorption mechanism (3), and a detection device (4). The conveying mechanism (2) includes a conveying housing (21) and a star wheel (22). The conveying housing (21) is mounted on the frame (1) and has an inlet channel (211) and an outlet channel (212). The star wheel (22) has several evenly distributed slots (221) for accommodating the tank blanks (5) at its edge. The star wheel (22) conveys the tank blanks (5) in the inlet channel (211) to the outlet channel (212) along the conveying path by rotating. The detection device (4) is installed on the conveying housing. The shell (21) is located on the conveying path of the tank blank (5) and its detection end is located on the shell (21) to detect the opening orientation of the tank blank (5); the adsorption mechanism (3) includes a turntable (301), a lifting drive device (302) and a negative pressure suction cup (303). The turntable (301) rotates synchronously with the star wheel (22) and the rotation center lines of the two are coaxially set. The negative pressure suction cup (303) is installed on the turntable (301) and connected to the negative pressure source (312). The negative pressure suction cup (303) corresponds one-to-one with the slot (221). The turntable (301) is driven to lift by the lifting drive device (302).

2. The necking machine can blank orientation identification device according to claim 1, characterized in that, The conveying mechanism (2) also includes a drive motor (23) and a spline shaft (24). The drive motor (23) is mounted on the frame (1), and the spline shaft (24) is rotatably mounted on the conveying housing (21) through the first bearing (25). The output end of the drive motor (23) is connected to the spline shaft (24) for transmission, and the star wheel (22) is fixedly mounted on the spline shaft (24).

3. The necking machine can blank orientation identification device according to claim 2, characterized in that, The adsorption mechanism (3) also includes a spline sleeve (304), which is fitted onto the spline shaft (24) and is key-connected to the spline shaft (24).

4. The necking machine can blank orientation identification device according to claim 1, characterized in that, The adsorption mechanism (3) also includes a second bearing (305) and a ring plate (306). The ring plate (306) is rotatably connected to the turntable (301) through the second bearing (305). The second bearing (305) and the turntable (301) are coaxially arranged. The lifting drive device (302) is installed on the frame (1). The output end of the lifting drive device (302) is connected to the ring plate (306).

5. The necking machine can blank orientation identification device according to claim 1, characterized in that, The adsorption mechanism (3) also includes a multi-port rotary joint (307), and the negative pressure suction cup (303) is connected to the negative pressure source (312) through the multi-port rotary joint (307).

6. The necking machine can blank orientation identification device according to claim 5, characterized in that, The adsorption mechanism (3) further includes a branch rotating negative pressure pipe (308), a branch fixed negative pressure pipe (309), a main negative pressure pipe (310), and a main control valve (311). The branch rotating negative pressure pipe (308) and the branch fixed negative pressure pipe (309) correspond one-to-one with the negative pressure suction cup (303). The negative pressure suction cup (303) is connected to the rotating end interface of the multi-way rotary joint (307) through the branch rotating negative pressure pipe (308). The fixed end interface of the multi-way rotary joint (307) is connected to the main negative pressure pipe (310) through the branch fixed negative pressure pipe (309). The main negative pressure pipe (310) is connected to the negative pressure source (312). The main control valve (311) is installed on the main negative pressure pipe (310).

7. The necking machine can blank orientation identification device according to claim 1, characterized in that, The conveying housing (21) includes a bottom plate (213), an outer protective plate (214), an infeed guide plate (215), an outfeed guide plate (216), and a lever plate (217). The bottom plate (213) is fixedly connected to the frame (1). The outer protective plate (214), the infeed guide plate (215), and the outfeed guide plate (216) are fixedly installed on the bottom plate (213). An infeed channel (211) is formed between the outer protective plate (214) and the infeed guide plate (215). An outfeed channel (212) is formed between the outer protective plate (214) and the outfeed guide plate (216). The lever plate (217) is fixedly installed on the outfeed guide plate (216) and located above the star wheel (22). The lever plate (217) is used to guide the tank blank (5) in the slot (221) to the outfeed channel (212).

8. The necking machine can blank orientation identification device according to claim 7, characterized in that, The outer protective plate (214) includes a feeding straight plate (2141), an arc plate (2142), and a discharge straight plate (2143) connected in sequence. A feeding channel (211) is formed between the feeding straight plate (2141) and the feeding guide plate (215). A discharge channel (212) is formed between the discharge straight plate (2143) and the discharge guide plate (216). The center line of the arc plate (2142) is coaxial with the center line of the star wheel (22).

9. The necking machine can blank orientation identification device according to claim 1, characterized in that, The bottom end of the conveying housing (21) is provided with a detection hole, and the detection device (4) is installed at the bottom end of the conveying housing (21), with the detection end of the detection device (4) located inside the detection hole.

10. The necking machine can blank orientation identification device according to claim 1, characterized in that, Along the rotation direction of the star wheel (22), there is a rejection station (6) between the discharge channel (212) and the inlet channel (211). The rejection station (6) is located on the movement trajectory of the slot (221). The negative pressure of the negative pressure suction cup (303) disappears at the rejection station (6), causing the tank blank (5) adsorbed by it to fall under gravity.

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