A gathering machine

By designing an automated battery collection machine, utilizing a material tray and discharge track structure, combined with a shaking device and photoelectric switches, the problem of low efficiency in manual battery collection was solved, achieving automated battery collection and efficient arrangement.

CN118025842BActive Publication Date: 2026-07-03YUNNAN KUNCHUAN NO1 MASCH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YUNNAN KUNCHUAN NO1 MASCH CO LTD
Filing Date
2024-02-22
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing battery assembly methods rely on manual operation, which leads to high levels of human fatigue and low efficiency.

Method used

Design a collection machine including a feeding device, a hopper and a discharging device. It uses a material tray and a discharging track to form a discharging channel, and combines a shaking device and a photoelectric switch to realize automated battery collection and arrangement.

Benefits of technology

It enables automated collection and arrangement of batteries, saving manpower and improving collection efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

A material collecting machine includes a feeding device, a hopper, and a discharging device. The feeding device is located at the inlet of the hopper, and the discharging device is located at the outlet of the hopper. The feeding device has several feeding channels spaced apart, and the outlets of these channels converge at the inlet of the hopper. The outlet is located at the bottom of the hopper. The discharging device is located below the hopper. The discharging device includes a discharging track and a material-carrying disc that rotates in a vertical plane. Several material-carrying grooves are formed on the side wall of the material-carrying disc, filling its circumference. The material-carrying disc is positioned at the outlet, with a portion of its circumference inside the hopper. The discharging track is located outside the hopper, enclosing the portion of the material-carrying disc's circumference outside the hopper. A gap exists between the discharging track and the material-carrying disc, forming a discharging channel. The inlet of the discharging channel communicates with the outlet of the hopper. This material collecting machine can conveniently collect materials in one place, arrange them in a row, and then send them to the next workstation.
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Description

Technical Field

[0001] This invention relates to the field of battery processing, and in particular to a collection machine. Background Technology

[0002] During battery manufacturing, the finished batteries are often distributed to different workstations for further processing or packaging. After processing, the batteries from different workstations are gathered together and then arranged in a row to be sent to the next workstation.

[0003] The current collection method is manual collection, where operators move batteries from different workstations to the same location, then arrange them in a row and send them to the next workstation via conveyor belt. This method is labor-intensive and inefficient.

[0004] Therefore, it is particularly necessary to provide a new device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a collection machine that can conveniently collect materials in one place, arrange them in a row, and then send them to the next work station, in order to address the problems mentioned above.

[0006] The technical solution adopted in this invention is as follows:

[0007] A collecting machine includes a feeding device, a hopper, and a discharging device;

[0008] The hopper is provided with an inlet and an outlet; the feeding device is located at the inlet of the hopper, and the discharging device is located at the outlet of the hopper.

[0009] The feeding device is provided with several feeding channels at intervals, and the outlets of the feeding channels converge at the inlet of the hopper and are connected to the inlet of the hopper.

[0010] The discharge port is located at the bottom of the hopper; the discharge device is located below the hopper;

[0011] The discharge device includes a discharge track and a material tray that rotates in a vertical plane;

[0012] The side wall of the conveyor belt is provided with several conveyor belt grooves, which cover the circumference of the conveyor belt; the conveyor belt is set at the discharge port, so that part of the circumference of the conveyor belt is located inside the hopper; the discharge track is located outside the hopper and wraps around the part of the circumference of the conveyor belt located outside the hopper.

[0013] There is a gap between the discharge track and the conveyor belt, which forms a discharge channel between the discharge track and the conveyor belt; the inlet of the discharge channel is connected to the outlet of the hopper.

[0014] Furthermore, the hopper is a flat hopper with openings at the top and bottom, enclosed by a front cover plate, a rear upright plate, and a side plate; the side plate is located between the front cover plate and the rear upright plate, and is used to connect the left and right sides of the front cover plate and the rear upright plate; the top opening of the hopper is a material overflow outlet, and the bottom opening is a discharge outlet; the feed inlet is located on the side plate.

[0015] Furthermore, the size of the rear upright plate is larger than that of the front cover plate; the hopper is located on the upper part of the rear upright plate; the feeding device is fixedly installed on the front of the rear upright plate, located on the side where the hopper has a feeding port; the discharging device is fixedly installed on the front of the rear upright plate, located on the lower part of the rear upright plate.

[0016] Furthermore, a collecting plate is provided at the feed inlet of the hopper. The collecting plate is located outside the hopper, with one end fixedly installed at the feed inlet at the lower edge of the feed inlet, and the other end connected to the bottom of the feeding device.

[0017] Furthermore, a feeding vibration device is provided at the material collection plate.

[0018] Furthermore, the feeding shaking device includes a feeding shaking plate and a feeding shaking plate flipping mechanism; the collecting plate has a collecting plate strip hole that passes through the collecting plate, the upper end of the feeding shaking plate is set in the collecting plate strip hole, the middle part of the feeding shaking plate is located outside the hopper and is rotatably set on the rear upright plate, and the feeding shaking plate flipping mechanism is set at the lower end of the feeding shaking plate to drive the lower end of the feeding shaking plate to swing, so that the entire feeding shaking plate swings around the middle part of the feeding shaking plate;

[0019] When the upper end of the feed vibrating plate swings upward within the strip hole of the collecting plate, the upper end of the feed vibrating plate can pass upward through the strip hole of the collecting plate.

[0020] Furthermore, a discharge shaking device is provided at the discharge port of the hopper.

[0021] Furthermore, the discharge shaking device is located on the side of the conveyor belt that is not covered by the discharge track.

[0022] Furthermore, the discharge shaking device includes a discharge shaking plate and a discharge shaking plate flipping mechanism; a side plate strip hole penetrating the side plate is provided on the side plate of the discharge shaking device, the lower end of the discharge shaking plate is disposed in the side plate strip hole, the upper end of the discharge shaking plate is located outside the hopper and is rotatably disposed on the front of the rear upright plate, and the discharge shaking plate flipping mechanism is disposed outside the hopper, near the lower end of the discharge shaking plate; the discharge shaking plate flipping mechanism is used to drive the lower end of the discharge shaking plate to swing around the upper end, so that the lower end of the discharge shaking plate can swing into the hopper through the side plate strip hole.

[0023] Furthermore, the upper part of the hopper is provided with a movable cover plate, an upper photoelectric switch and a lower photoelectric switch; the movable cover plate is located at the material overflow port and can move up and down inside the hopper; the upper photoelectric switch is located at the material overflow port and the lower photoelectric switch is located below the lower photoelectric switch.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] In this invention, the feeding device can collect all the dispersed batteries and send them into the hopper; then the batteries roll to the discharge port of the hopper under the action of gravity; due to the presence of the conveyor belt, the batteries can fall into the conveyor belt trough, and then the conveyor belt sequentially sends the batteries in the conveyor belt trough into the discharge channel, so that the batteries are arranged in a row in the discharge channel and sent out in sequence, which facilitates the processing of subsequent stations.

[0026] The battery collection machine of this invention can automatically collect batteries, making it convenient to send them in a row to the next workstation. This saves manpower and improves collection efficiency. Attached Figure Description

[0027] Figure 1 This is a diagram of the internal structure of the present invention;

[0028] Figure 2 This is a structural diagram of the hopper;

[0029] Figure 3 This is a diagram of the external structure of the present invention;

[0030] Figure 4 This is a structural diagram of the feeding shaking device, the discharging device, and the discharging shaking device. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not 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 invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] like Figures 1-4 As shown, the present invention discloses a collection machine that can be used to collect various types of materials. In this embodiment, battery collection is used as an example to introduce the collection machine of the present invention.

[0038] A collecting machine includes a feeding device 1, a hopper 3, and a discharging device 5;

[0039] The hopper 3 is provided with an inlet 301 and an outlet 304; the feeding device 1 is located at the inlet 301 of the hopper 3, and the discharging device 5 is located at the outlet 304 of the hopper 3.

[0040] The feeding device 1 is provided with several feeding channels at intervals. The outlets of the feeding channels converge at the inlet 301 of the hopper 3 and are connected to the inlet 301 of the hopper 3.

[0041] The discharge port 304 is located at the bottom of the hopper 3; the discharge device 5 is located below the hopper 3.

[0042] The discharge device 5 includes a discharge track 502 and a material tray 501 that rotates in a vertical plane;

[0043] The side wall of the material tray 501 is provided with several material grooves, which cover the circumference of the material tray 501. Figure 1 As shown, due to the presence of the material trough, the entire material tray 501 resembles a gear; the material tray 501 is located at the discharge port 304, so that part of the circumference of the material tray 501 is located inside the hopper 3; the discharge track 502 is located outside the hopper 3, wrapping around the part of the circumference of the material tray 501 located outside the hopper 3.

[0044] There is a gap between the discharge track 502 and the material tray 501, which forms a discharge channel between the discharge track 502 and the material tray 501; the inlet of the discharge channel is connected to the discharge port 304 of the hopper 3.

[0045] Due to the above structure, the feeding device 1 can collect all the dispersed batteries and send them into the hopper 3; then the batteries roll to the discharge port 304 of the hopper 3 under the action of gravity; due to the presence of the conveyor belt 501, the batteries can fall into the conveyor belt trough, and then the conveyor belt 501 sequentially sends the batteries in the conveyor belt trough into the discharge channel, so that the batteries are arranged in a row in the discharge channel and sent out in sequence, which facilitates the processing of subsequent stations.

[0046] This battery collection machine can automatically collect batteries, making it easy to line them up and send them to the next workstation. This saves manpower and improves collection efficiency.

[0047] In this invention, the material troughs are evenly spaced around the material tray 501, so that the batteries can be discharged in a row at equal intervals and sent to the next station.

[0048] Furthermore, the hopper 3 is a flat hopper 3 with openings at the top and bottom, enclosed by a front cover plate 305, a rear upright plate 302, and a side plate 303; the side plate 303 is located between the front cover plate 305 and the rear upright plate 302, and is used to connect the left and right sides of the front cover plate 305 and the rear upright plate 302; the top opening of the hopper 3 is a material overflow outlet, and the bottom opening is a discharge outlet 304; the inlet 301 is opened on the side plate 303.

[0049] In practice, the battery rolls into the hopper 3 through the feeding channel. The hopper 3 is flat, and the width between the front cover plate 305 and the rear upright plate 302 matches the length of the battery. This ensures that the battery rolls smoothly to the discharge port 304 and prevents the battery from moving around inside the hopper 3.

[0050] Because of the material overflow outlet, when too many batteries accumulate in the hopper 3, they will overflow from the material overflow outlet, preventing excessive battery accumulation in the hopper 3 from affecting the discharge of the hopper 3 and causing the batteries to clog the discharge port 304 of the hopper 3. The existence of the material overflow outlet also makes it convenient to control the feeding speed of the hopper 3 based on the amount of overflow.

[0051] To facilitate the detection of battery overflow, a photoelectric switch can be installed at the material overflow outlet to detect whether the battery has reached the material overflow outlet.

[0052] In specific implementation, a movable cover plate 7, an upper photoelectric switch 8, and a lower photoelectric switch 9 can be installed on the upper part of the hopper 3; the movable cover plate 7 is located at the material overflow port, and the two ends of the movable cover plate 7 are slidably mounted on the side plate 303 and can move up and down inside the hopper 3; the upper photoelectric switch 8 is located at the material overflow port, and the lower photoelectric switch 9 is located below the lower photoelectric switch 9.

[0053] When the battery pushes the movable plate upward to the upper photoelectric switch 8, it indicates that the battery in hopper 3 has reached the critical value and is about to overflow. When the movable cover 7 is at the lower photoelectric switch 9, it indicates that the material in hopper 3 is not saturated, and the feeding speed can be increased.

[0054] Furthermore, the rear upright plate 302 is larger than the front cover plate 305; the hopper 3 is located on the upper part of the rear upright plate 302; the feeding device 1 is fixedly installed on the front of the rear upright plate 302, located on the side where the hopper 3 has the feeding port 301; the discharging device 5 is fixedly installed on the front of the rear upright plate 302, located on the lower part of the rear upright plate 302. The conveyor belt 501 is rotatably installed on the front of the rear upright plate 302, and a drive motor for the conveyor belt 501 is installed on the back of the rear upright plate 302. The drive motor for the conveyor belt 501 is used to drive the conveyor belt 501 to rotate.

[0055] Since the rear upright plate 302 is larger than the front cover plate 305, the rear upright plate 302 can serve as the frame for the entire collecting machine. As part of the hopper 3, the frame simplifies the overall structure of the equipment, making it more compact.

[0056] Furthermore, such as Figure 1 As shown, a collecting plate 2 is provided at the feed inlet 301 of the hopper 3. The collecting plate 2 is located outside the hopper 3. One end of the collecting plate 2 is fixedly installed at the feed inlet 301, located at the lower edge of the feed inlet 301, and the other end is connected to the bottom of the feeding device 1.

[0057] Because of the presence of the collecting plate 2, the batteries coming out of the feeding channel can first fall onto the collecting plate 2, and then fall from the collecting plate 2 to the discharge port 304 of the hopper 3 in sequence. This can prevent a large number of batteries coming out of multiple feeding channels from falling directly into the discharge port 304 of the hopper 3, causing the discharge port 304 to become blocked.

[0058] like Figure 1 As shown, to prevent the battery from falling directly into the discharge port 304, the collection plate 2 can be tilted upwards.

[0059] Furthermore, to prevent batteries from clogging the collecting plate 2, especially when the collecting plate 2 is tilted upwards, a feeding vibration device 6 can be installed at the collecting plate 2.

[0060] Furthermore, the feeding shaking device 6 includes a feeding shaking plate 601 and a feeding shaking plate flipping mechanism 602; the collecting plate 2 has a strip hole that passes through the surface of the collecting plate 2, the upper end of the feeding shaking plate 601 is disposed in the strip hole of the collecting plate 2, the middle part of the feeding shaking plate 601 is located outside the hopper 3 and is rotatably disposed on the rear upright plate 302, and the feeding shaking plate flipping mechanism 602 is disposed at the lower end of the feeding shaking plate 601, and is used to drive the lower end of the feeding shaking plate 601 to swing, so that the entire feeding shaking plate 601 swings around the middle part of the feeding shaking plate 601;

[0061] When the upper end of the feeding vibrating plate 601 swings upward within the strip hole of the collecting plate 2, the upper end of the feeding vibrating plate 601 can pass upward through the strip hole of the collecting plate 2, pushing the material on the collecting plate 2 to vibrate.

[0062] like Figure 1 As shown, the feed shaking plate 601 is bent into an L-shape, which includes an upwardly inclined lifting part and a downwardly inclined driving part; the inflection point is rotatably set on the rear upright plate 302, the upper end of the lifting part extends into the strip hole of the collecting plate 2, and the lower end of the driving part contacts the feed shaking plate flipping mechanism 602.

[0063] The feed vibrating plate flipping mechanism 602 is located on the outside of the drive unit, that is... Figure 1 On the left side, the upper surface and / or upper end of the lifting part are used to contact the battery on the collection plate 2. The feeding shaking plate flipping mechanism 602 is a feeding shaking plate 601 eccentric wheel or feeding shaking plate 601 cam rotatably mounted on the front of the rear upright plate 302, and the outer edge of the feeding shaking plate 601 eccentric wheel or feeding shaking plate 601 cam contacts the lower end of the drive part. A drive motor is provided on the rear upright plate 302, and the drive motor is used to drive the feeding shaking plate 601 eccentric wheel or feeding shaking plate 601 cam to rotate.

[0064] like Figure 1As shown, the rotation of the eccentric wheel or cam of the feeding vibrating plate 601 can push the lower end of the feeding vibrating plate 601 to the right, causing the upper end of the feeding vibrating plate 601 to pass through the strip hole of the collecting plate 2, thus vibrating the material accumulated on the collecting plate 2. When the eccentric wheel or cam of the feeding vibrating plate 601 continues to rotate and does not push the lower end of the feeding vibrating plate 601 to the right, the battery presses against the upper end of the feeding vibrating plate 601, causing the lower end of the feeding vibrating plate to move to the left.

[0065] Furthermore, a discharge shaking device 4 is provided at the discharge port 304 of the hopper 3. The presence of the discharge shaking device 4 can prevent material from clogging the discharge port 304 of the hopper 3.

[0066] like Figure 1 As shown, the discharge shaking device 4 is located on the side of the conveyor belt 501 that is not covered by the discharge track 502.

[0067] Furthermore, the discharge shaking device 4 includes a discharge shaking plate 401 and a discharge shaking plate flipping mechanism 402. A strip-shaped hole is provided through the side plate 303, located on the side of the conveyor belt 501 not covered by the discharge track 502. The lower end of the discharge shaking plate 401 is positioned within the strip-shaped hole, and the upper end of the discharge shaking plate 401 is located outside the hopper 3 and rotatably positioned on the front of the rear upright plate 302. The discharge shaking plate flipping mechanism 402 is located outside the hopper 3, near the lower end of the discharge shaking plate 401. The discharge shaking plate flipping mechanism 402 drives the lower end of the discharge shaking plate 401 to swing around its upper end, allowing the lower end of the discharge shaking plate 401 to pass through the strip-shaped hole in the side plate 303 and swing into the hopper 3. The swinging of the discharge shaking plate 401 shakes the material at that location, thus preventing blockage.

[0068] The discharge shaking plate flipping mechanism 402 is a rotatable eccentric wheel or cam of the discharge shaking plate 401 mounted on the front of the rear upright plate 302. The outer edge of the eccentric wheel or cam of the discharge shaking plate 401 contacts the lower end of the discharge shaking plate 401. A second drive motor is mounted on the rear upright plate 302, which drives the eccentric wheel or cam of the discharge shaking plate 401 to rotate.

[0069] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A collection machine, characterized in that: It includes a feeding device (1), a hopper (3), and a discharging device (5); the hopper (3) has a feeding port (301) and a discharging port (304); the feeding device (1) is located at the feeding port (301) of the hopper (3), and the discharging device (5) is located at the discharging port (304) of the hopper (3); the feeding device (1) has several feeding channels spaced apart, and the outlets of the feeding channels converge at the feeding port (301) of the hopper (3), which is connected to the feeding port (301) of the hopper (3); the discharging port (304) is located at the bottom of the hopper (3); the discharging device (5) is located below the hopper (3); the discharging device (5) includes a discharging track (50) 2) A material tray (501) rotating in a vertical plane; several material tray grooves are provided on the side wall of the material tray (501), and the material tray grooves cover the circumference of the material tray (501); the material tray (501) is set at the discharge port (304), so that part of the circumference of the material tray (501) is located inside the hopper (3); the discharge track (502) is located outside the hopper (3), and wraps around the part of the circumference of the material tray (501) located outside the hopper (3); there is a gap between the discharge track (502) and the material tray (501), and this gap forms a discharge channel between the discharge track (502) and the material tray (501); the entrance of the discharge channel is connected to the discharge port (304) of the hopper (3). The hopper (3) is a flat hopper with openings at the top and bottom, enclosed by a front cover plate (305), a rear upright plate (302), and a side plate (303); the side plate (303) is located between the front cover plate (305) and the rear upright plate (302), and is used to connect the left and right sides of the front cover plate (305) and the rear upright plate (302); the top opening of the hopper (3) is a material overflow outlet, and the bottom opening is a discharge outlet (304); the feed inlet (301) is opened on the side plate (303), and the size of the rear upright plate (302) is larger than the size of the front cover plate (305); the hopper (3) is located on the upper part of the rear upright plate (302); the feeding device (1) is fixedly installed at the rear. The front of the upright plate (302) is located on the side where the feed inlet (301) of the hopper (3) is opened; the discharge device (5) is fixedly installed on the front of the rear upright plate (302) and located at the lower part of the rear upright plate (302). A collection plate (2) is provided at the feed inlet (301) of the hopper (3). The collection plate (2) is located outside the hopper (3). One end of the collection plate (2) is fixedly installed at the feed inlet (301) and located at the lower edge of the feed inlet (301). The other end is connected to the bottom of the feeding device (1). A feeding shaking device (6) is provided at the collection plate (2). The feeding shaking device (6) includes a feeding shaking plate (601) and a feeding shaking plate flipping mechanism (602).The collecting plate (2) has a through-hole in the collecting plate (2). The upper end of the feeding vibrating plate (601) is set in the through-hole of the collecting plate (2). The middle part of the feeding vibrating plate (601) is located outside the hopper (3) and is rotatably set on the rear upright plate (302). The feeding vibrating plate flipping mechanism (602) is set at the lower end of the feeding vibrating plate (601) to drive the lower end of the feeding vibrating plate (601) to swing, so that the entire feeding vibrating plate (601) swings around the middle part of the feeding vibrating plate (601). When the upper end of the feeding vibrating plate (601) swings upward in the through-hole of the collecting plate (2), the upper end of the feeding vibrating plate (601) can pass upward through the through-hole of the collecting plate (2). The discharge vibrating device (4) is located on the material tray (501) and not on the discharge track (502). On one side of the package, the discharge shaking device (4) includes a discharge shaking plate (401) and a discharge shaking plate flipping mechanism (402); a side plate (303) has a through-hole in the side plate (303), the lower end of the discharge shaking plate (401) is located in the through-hole in the side plate (303), the upper end of the discharge shaking plate (401) is located outside the hopper (3) and is rotatably located on the front of the rear upright plate (302), and the discharge shaking plate flipping mechanism (402) is located outside the hopper (3) near the lower end of the discharge shaking plate (401); the discharge shaking plate flipping mechanism (402) is used to drive the lower end of the discharge shaking plate (401) to swing around the upper end, so that the lower end of the discharge shaking plate (401) can pass through the through-hole in the side plate (303) and swing into the hopper (3).

2. The collection machine according to claim 1, characterized in that: The discharge outlet (304) of the hopper (3) is provided with a discharge shaking device (4).

3. The collecting machine according to claim 1, characterized in that: The upper part of the hopper (3) is provided with a movable cover plate (7), an upper photoelectric switch (8) and a lower photoelectric switch (9); the movable cover plate (7) is located at the material overflow port and can move up and down inside the hopper (3); the upper photoelectric switch (8) is located at the material overflow port and the lower photoelectric switch (9) is located below the lower photoelectric switch (9).