Multi-runner automatic pitch changing device convenient for non-visual robot to flexibly supply plastic shell

By designing a multi-channel automatic pitch-changing device that facilitates flexible supply of plastic shells by visionless robots, efficient automated feeding and precise gripping of plastic shells of various specifications have been achieved. This solves the problem of high efficiency and low cost in wiring harness assembly equipment for new energy vehicles, and improves the overall production efficiency and intelligence level of the vehicle.

CN223990579UActive Publication Date: 2026-03-13WUXI TD MASCH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-25
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Existing wiring harness assembly equipment for new energy vehicles is expensive and it is difficult to achieve efficient, automated, and intelligent material supply for multi-specification plastic shells, which affects the production efficiency and cost of the entire vehicle.

Method used

Design a multi-channel automatic pitch-changing device for flexible supply of plastic shells to vision-free robots. The device includes a combined support frame, a belt-type single-drive conveyor line, parallel channels, a channel pitch-changing adjustment mechanism, and a sensing and detection module. The single-drive conveyor line enables multi-channel plastic shell conveying, the parallel channel width is adjusted online, and the sensing and detection module enables vision-free grasping.

Benefits of technology

It significantly improves the material supply efficiency and assembly accuracy of multi-specification plastic shells, reduces manufacturing costs, and enhances the automation and intelligent assembly level of wiring harnesses for new energy vehicles.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of intelligent assembly equipment for wire harnesses of new energy automobiles, in particular to a multi-runner automatic pitch changing device convenient for a visual-free robot to flexibly supply plastic shells, and the multi-runner automatic pitch changing device is arranged on a robot flexible feeding machine table. Comprising a combined support, a belt type single-drive conveying line, a parallel flow channel, a flow channel variable-pitch adjusting mechanism, a sensing detection module and a device controller, the combined support is installed on a robot flexible feeding machine table, the belt type single-drive conveying line is arranged on the combined support, the parallel flow channel is installed between the combined support and the belt type single-drive conveying line, and the flow channel variable-pitch adjusting mechanism is arranged on the combined support. The flow channel variable-pitch adjusting mechanism is arranged between the combined support and the parallel flow channels, the sensing detection modules are installed on the left side and the right side of each branch flow channel, and the platform controller is electrically connected with the control belt type single-drive conveying line, the flow channel variable-pitch adjusting mechanism and the sensing detection modules. The method has the effect of improving the automatic and intelligent assembly level of the wire harness of the new energy automobile.
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Description

Technical Field

[0001] This utility model relates to the field of intelligent assembly equipment for wiring harnesses of new energy vehicles, and in particular to a multi-channel automatic pitch-changing device that facilitates flexible supply of plastic shells by visionless robots. Background Technology

[0002] Automotive assembly lines based on industrial robots are a traditional and effective way to improve automotive production efficiency. However, such assembly lines are very expensive. With the accelerated development of my country's new energy vehicle strategy, the number of electric or hybrid electric vehicles on the road is also rising sharply. As an important link connecting various components of electric or hybrid electric vehicles, the quality and efficiency of wiring harness assembly are particularly crucial for improving the intelligent assembly technology of electric vehicles and ensuring the service performance and manufacturing cost of the whole vehicle. There is an urgent need to develop special equipment to match industrial robots in order to comprehensively improve the level of automation and intelligent assembly of wiring harnesses in new energy vehicles. Utility Model Content

[0003] To improve the level of automation and intelligent assembly of wiring harnesses for new energy vehicles, this application provides a multi-channel automatic pitch-changing device that facilitates flexible supply of plastic shells without vision robots.

[0004] This application provides a multi-channel automatic pitch-changing device for flexibly supplying plastic shells using a visionless robot, which employs the following technical solution:

[0005] A multi-channel automatic pitch-changing device for flexibly supplying plastic shells to a visionless robot is provided, mounted on a robot flexible feeding machine platform. The device comprises a combined support frame, a belt-driven single-drive conveyor line, parallel flow channels, a flow channel pitch-changing adjustment mechanism, a sensing module, and a device controller. The combined support frame is mounted on the robot flexible feeding machine platform. The belt-driven single-drive conveyor line is mounted on the combined support frame. The parallel flow channels are installed between the combined support frame and the belt-driven single-drive conveyor line. The flow channel pitch-changing adjustment mechanism is installed between the combined support frame and the parallel flow channels. The sensing module is installed on the left and right sides of each flow channel. The platform controller is electrically connected to control the belt-driven single-drive conveyor line, the flow channel pitch-changing adjustment mechanism, and the sensing module.

[0006] Preferably, the combined support includes a portal frame one, a portal frame two, and a portal frame three. Portal frame one and portal frame two are both arranged in an inverted "U" shape. Portal frame one and portal frame two are arranged in parallel front to back. A crossbeam connects portal frame one and portal frame two. The crossbeam is provided at the two ends of portal frame one that are far apart. Portal frame three is connected to portal frame two. Portal frame three is arranged in a "C" shape and is horizontally arranged in the middle of one side of portal frame two.

[0007] Preferably, both the top of the first gate-shaped bracket and the second gate-shaped bracket are connected to linear guide rails, which are arranged along the length of the first gate-shaped bracket, and a plurality of sliders are arranged on the linear guide rails.

[0008] Preferably, the belt-type single-drive conveyor line includes a conveyor body, a drive motor, and a reducer. The conveyor body is connected between a first gate-type support and a second gate-type support via a line body bracket. The working width of the conveyor body is set according to the specific number of parallel flow channels. The drive motor and the reducer are mounted on the line body bracket of the conveyor body and are interconnected. The power output shaft of the reducer is interconnected with the power input shaft of the conveyor body.

[0009] Preferably, the parallel flow channel is provided with an inlet and an outlet, which are located at both ends of the belt single-drive conveyor line. Each parallel flow channel includes a left baffle, a right baffle, and an end baffle. A sliding plate is connected between two opposing sliders on the first and second portal brackets. Several sliding plates are arranged along the length of the linear guide rail. The left and right baffles are respectively connected to a sliding plate. The end baffle is connected to the third portal bracket and is located behind each parallel flow channel, between the left and right baffles of each parallel flow channel.

[0010] Preferably, each of the parallel flow channels further includes a pointer and a scale. The pointer is connected to the slide plate and is located at the end of the slide plate near the first portal frame. The scale is connected to the side wall of the first portal frame and is located directly above each flow channel. The pointer points to the corresponding scale.

[0011] Preferably, the flow channel pitch adjustment mechanism includes a pitch-changing drive device, a synchronous belt drive, a drive shaft, and a second slider. A fixed bracket connects the first and second portal brackets. The pitch-changing drive device is mounted on the fixed bracket, and its output shaft is connected to the power input end of the lower end of the vertically placed synchronous belt drive. The power output end of the upper end of the synchronous belt drive is connected to the power input end of the drive shaft. The drive shaft is mounted on two crossbeams at both ends of the combined bracket through bearing seats at both ends. The second slider is connected to the top surface of the slide plate. The second slider is provided with an extension shaft. A combined spiral groove for the extension shaft to slide is opened on the drive shaft. The extension shaft can slide in the combined spiral groove on the drive shaft.

[0012] Preferably, the synchronous belt drive is further provided with a tensioning wheel assembly for real-time tensioning of the synchronous belt, and the tensioning wheel assembly is fixed on the conveyor line support.

[0013] Preferably, the number of combined spiral grooves on the drive shaft is equal to the number of parallel flow channels, and each group of combined spiral grooves includes two spiral grooves with opposite directions of rotation.

[0014] Preferably, the number of sensing and detection modules is equal to the number of parallel flow channels. Each sensing and detection module includes a light emitting sensor and a light receiving sensor. The sensor bracket is connected to a portal frame three. Several sensor brackets are provided on the portal frame three. Both the light emitting sensor and the light receiving sensor are connected to the sensor bracket. The light emitting sensor and the light receiving sensor are located on the outside of the left and right baffles of each flow channel, respectively. The light receiving sensor can receive the light emitted by the light emitting sensor. The left and right baffles are provided with through holes for the light emitted by the light emitting sensor to pass through.

[0015] In summary, this application includes the following beneficial technical effects:

[0016] This utility model provides a multi-channel automatic pitch-changing device for flexibly supplying plastic shells to a vision-free robot. It achieves automatic conveying of plastic shells in multiple channels using a single-drive conveyor line, resulting in a simple structure and low cost. By employing a channel pitch-changing adjustment mechanism, the working width of each branch channel in the parallel channels is automatically adjusted online, making it suitable for automatic loading and unloading of plastic shells of various specifications, significantly improving the feeding efficiency of multi-specification plastic shells. Through the collaborative design of the parallel channel end baffle and the sensing detection module, the loading and unloading robot can accurately grasp the plastic shells in the channels without relying on vision, further reducing the manufacturing cost of the semi-automatic loading and unloading device for multi-specification plastic shells, thereby achieving the effect of improving the automation and intelligent assembly level of wiring harnesses in new energy vehicles. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the multi-channel automatic pitch-changing device in the embodiments of this application, which facilitates the flexible supply of plastic shells by visionless robots.

[0018] Figure 2 This is a schematic diagram illustrating the structure of the combined support in the embodiments of this application;

[0019] Figure 3 This is a schematic diagram illustrating the assembly of the combined support frame and the belt-driven single-drive conveyor line in the embodiments of this application;

[0020] Figure 4 This is a schematic diagram illustrating the assembly of the combined support, parallel flow channel, flow channel pitch adjustment mechanism, and sensing module in the embodiments of this application.

[0021] Figure 5 This is a schematic diagram of the structure of the application mechanism in the embodiments of this application.

[0022] Explanation of reference numerals in the attached figures: Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 do not indicate or imply that the device or element referred to must have a specific orientation or specific orientation structure and operation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] This application discloses a multi-channel automatic pitch-changing device for flexibly supplying plastic shells to vision-free robots. (Refer to...) Figures 1-5A multi-channel automatic pitch-changing device, facilitating flexible feeding of plastic shells by a visionless robot, is mounted on the robot's flexible feeding machine platform. Its features include: a combined support 100, a belt-driven single-drive conveyor 200, parallel flow channels 300, a flow channel pitch-changing adjustment mechanism 400, a sensing and detection module 500, and a device controller. The combined support 100 is mounted on the robot's flexible feeding machine platform, supporting the belt-driven single-drive conveyor 200, parallel flow channels 300, flow channel pitch-changing adjustment mechanism 400, and sensing and detection module 500. The belt-driven single-drive conveyor 200 is mounted on the combined support 100, driving the plastic shells to move along the parallel flow channels 300. The channel 300 is installed between the combined support 100 and the belt-driven single-drive conveyor 200. The channel pitch adjustment mechanism 400 is set between the combined support 100 and the parallel channel 300. It is used to adjust the working width of each channel in the parallel channel 300. The sensing and detection module 500 is installed on the left and right sides of each channel. It is used to sense whether there is a plastic shell at the end of the parallel channel 300. The platform controller is electrically connected to control the belt-driven single-drive conveyor 200, the channel pitch adjustment mechanism 400 and the sensing and detection module 500, so as to realize the online adjustment of the working width of each channel in the parallel channel 300, which facilitates the flexible feeding of multi-specification plastic shells by the visionless robot.

[0026] The combined support 100 includes a first portal frame 110, a second portal frame 120, and a third portal frame 130. Both the first portal frame 110 and the second portal frame 120 are arranged in an inverted "U" shape. The first portal frame 110 and the second portal frame 120 are arranged in parallel with each other. A crossbeam 140 connects the first portal frame 110 and the second portal frame 120. The crossbeam 140 is located at the two ends of the first portal frame 110 that are far apart. The third portal frame 130 is connected to the second portal frame 120 and is arranged in a "C" shape. The third portal frame 130 is horizontally located in the middle of one side of the second portal frame 120.

[0027] Both the top of the first portal bracket 110 and the second portal bracket 120 are connected to linear guide rails 150. The linear guide rails 150 are arranged along the length of the first portal bracket 110, and several sliders 160 are arranged on the linear guide rails 150.

[0028] The belt-type single-drive conveyor line 200 includes a conveyor body 210, a drive motor 220, and a reducer 230. The conveyor body 210 is connected between a first gantry bracket 110 and a second gantry bracket 120 via a line body bracket. The working width of the conveyor body 210 is set according to the specific number of parallel flow channels 300. The drive motor 220 and the reducer 230 are mounted on the line body bracket of the conveyor body 210. The drive motor 220 and the reducer 230 are interconnected. The power output shaft of the reducer 230 is interconnected with the power input shaft of the conveyor body 210.

[0029] The parallel flow channel 300 is provided with an inlet and an outlet, which are located at both ends of the belt single-drive conveyor line 200. Each parallel flow channel 300 includes a left baffle 301, a right baffle 302, and an end baffle 303. A sliding plate 304 is connected between two opposing sliders 160 on the portal bracket 110 and portal bracket 220. Several sliding plates 304 are arranged along the length of the linear guide rail 150. The left baffle 301 and the right baffle 302 are respectively connected to a sliding plate 304. The end baffle 303 is connected to the portal bracket 330. The end baffle 303 is located behind each parallel flow channel and between the left baffle 301 and the right baffle 302 of each parallel flow channel.

[0030] Each flow channel of the parallel flow channel 300 also includes a pointer 305 and a scale 306. The pointer 305 is connected to the slide plate 304 and is located at the end of the slide plate 304 near the portal bracket 110. The scale 306 is connected to the side wall of the portal bracket 110 and is located directly above each flow channel. The pointer 305 points to the corresponding scale 306. This arrangement makes it easy for operators to intuitively understand the width of each flow channel.

[0031] The flow channel pitch adjustment mechanism 400 includes a pitch drive device 401, a synchronous belt drive 402, a drive shaft 403, and a second slider 404. A fixed bracket 405 connects the first portal bracket 110 and the second portal bracket 120. The pitch drive device 401 is mounted on the fixed bracket 405, and its output shaft is connected to the power input end of the lower end of the vertically placed synchronous belt drive 402. The power output end of the upper end of the synchronous belt drive 402 is connected to the power input end of the drive shaft 403. The drive shaft 403 is mounted on two crossbeams 140 at both ends of the combined bracket through bearing seats 407 at both ends. The second slider 404 is connected to the top surface of the slide plate 304. An extension shaft is provided on the second slider 404. A combined spiral groove for the extension shaft to slide is provided on the drive shaft 403. The extension shaft can slide in the combined spiral groove on the drive shaft 403.

[0032] The synchronous belt drive 402 is also equipped with a tensioning wheel assembly 406 for real-time tensioning of the synchronous belt, and the tensioning wheel assembly 406 is fixed on the line support of the conveyor line 210.

[0033] The number of combined spiral grooves on the drive shaft 403 is equal to the number of parallel flow channels 300. Each set of combined spiral grooves includes two spiral grooves with opposite directions of rotation.

[0034] The number of sensing and detection modules 500 is equal to the number of parallel flow channels 300. Each sensing and detection module 500 includes a light emitting sensor 501 and a light receiving sensor 502. A sensor bracket 503 is connected to a portal bracket 130. Several sensor brackets 503 are provided on the portal bracket 130. Both the light emitting sensor 501 and the light receiving sensor 502 are connected to the sensor bracket 503. The light emitting sensor 501 and the light receiving sensor 502 are located on the outside of the left baffle 301 and the right baffle 302 of each flow channel, respectively. The light receiving sensor 502 can receive the light emitted by the light emitting sensor 501. The left baffle 301 and the right baffle 302 are provided with through holes for the light emitted by the light emitting sensor 501 to pass through.

[0035] The implementation principle of the multi-channel automatic pitch-changing device for flexibly supplying plastic shells using a visionless robot according to an embodiment of this application is as follows: Before operation, the multi-channel automatic pitch-changing device is installed on the flexible supply table of the visionless robot. During operation, firstly, according to the specifications and dimensions of the plastic shell to be fed, the device controller controls the flow channel pitch-changing adjustment mechanism 400 to start. The synchronous belt drive 402 drives the drive shaft 403 to rotate. Through the cooperation of the combined spiral groove on the drive shaft 403 and the extended shaft on the slider 404, the slide plate 304 is moved, so that the left side baffle 3 of each branch of the parallel flow channel 300 moves. 01. The right baffle 302 is moved to the appropriate position, that is, each branch channel is adjusted to the required working width. Then, the operator puts the plastic shell to be fed into each branch channel of the parallel channel 300. Next, the device controller starts the belt single-drive conveyor line 200 to move the plastic shell in the channel in an orderly manner to the front of the end baffle 303. When the sensor detection module 500 of a certain branch channel detects that the plastic shell is in place, it feeds this information back to the device controller, which notifies the visionless robot to remove the plastic shell. At this point, the automatic feeding of the visionless robot by the multi-channel automatic variable pitch device is completed.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions within the scope of this utility model's concept are within the protection scope of this utility model. It should be pointed out that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A multi-channel automatic pitch-changing device for flexibly supplying plastic shells to a visionless robot, mounted on a robot flexible feeding machine platform, characterized in that: The device comprises a combined support (100), a belt single-drive conveying line (200), parallel flow channels (300), a flow channel variable-distance adjusting mechanism (400), a sensing detection module (500) and a device controller, the combined support (100) is installed on a robot flexible feeder platform, the belt single-drive conveying line (200) is arranged on the combined support (100), the parallel flow channels (300) are arranged between the combined support (100) and the belt single-drive conveying line (200), the flow channel variable-distance adjusting mechanism (400) is arranged between the combined support (100) and the parallel flow channels (300), the sensing detection module (500) is arranged on the left and right sides of each flow channel, and the platform controller is electrically connected to the belt single-drive conveying line (200), the flow channel variable-distance adjusting mechanism (400) and the sensing detection module (500).

2. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 1, characterized in that: The combined support (100) comprises a door-shaped support one (110), a door-shaped support two (120) and a door-shaped support three (130), the door-shaped support one (110) and the door-shaped support two (120) are arranged in an inverted "n" shape, the door-shaped support one (110) and the door-shaped support two (120) are arranged in parallel in front of and behind each other, the door-shaped support one (110) and the door-shaped support two (120) are connected with a cross beam (140), the cross beam (140) is provided with one at each end of the door-shaped support one (110) far away from each other, the door-shaped support three (130) is connected to the door-shaped support two (120), the door-shaped support three (130) is arranged in a "fang" shape, and the door-shaped support three (130) is arranged horizontally at the middle of one side of the door-shaped support two (120).

3. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 2, characterized in that: The top of the door-shaped support one (110) and the door-shaped support two (120) is connected with a linear guide rail (150), the linear guide rail (150) is arranged along the length direction of the door-shaped support one (110), and a plurality of sliding blocks one (160) are arranged on the linear guide rail (150).

4. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 1, characterized in that: The belt single-drive conveying line (200) comprises a conveying line body (210), a driving motor (220) and a speed reducer (230), the conveying line body (210) is connected between the door-shaped support one (110) and the door-shaped support two (120) through a line body support, the working width of the conveying line body (210) is set according to the specific number of the parallel flow channels (300), the driving motor (220) and the speed reducer (230) are installed on the line body support of the conveying line body (210), the driving motor (220) and the speed reducer (230) are connected with each other, and the power output shaft of the speed reducer (230) and the power input shaft of the conveying line body (210) are connected with each other.

5. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision as claimed in claim 1, wherein: The parallel flow channel (300) is provided with an inlet and an outlet, and the inlet and the outlet are respectively located at two ends of the belt single-drive conveying line (200). Each of the parallel flow channels (300) comprises a left baffle (301), a right baffle (302) and a terminal baffle (303). The opposite two sliders (160) of the door-shaped support one (110) and the door-shaped support two (120) are connected with a sliding seat plate (304). The sliding seat plate (304) is arranged in the length direction of the linear guide rail (150). The left baffle (301) and the right baffle (302) are respectively connected to one sliding seat plate (304). The terminal baffle (303) is connected to the door-shaped support three (130). The terminal baffle (303) is located at the rear of each parallel flow channel and between the left baffle (301) and the right baffle (302) of each parallel flow channel.

6. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 5, characterized in that: Each of the parallel flow channels (300) further comprises a pointer (305) and a scale (306). The pointer (305) is connected to the sliding seat plate (304). The pointer (305) is located at the end of the sliding seat plate (304) close to the door-shaped support one (110). The scale (306) is connected to the side wall of the door-shaped support one (110). The scale (306) is located directly above each flow channel. The pointer (305) points to the corresponding scale (306).

7. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision as claimed in claim 1, wherein: The flow channel variable-distance adjusting mechanism (400) comprises a variable-distance driving device (401), a synchronous belt transmission (402), a transmission shaft (403) and a slider two (404). The door-shaped support one (110) and the door-shaped support two (120) are connected with a fixed support (405). The variable-distance driving device (401) is installed on the fixed support (405). The output shaft of the variable-distance driving device (401) is connected with the power input end of the lower end of the vertical synchronous belt transmission (402). The power output end of the upper end of the synchronous belt transmission (402) is connected with the power input end of the transmission shaft (403). The transmission shaft (403) is installed on the two beams (140) at the two ends of the combined support through the bearing seats (407) at the two ends. The slider two (404) is connected to the top surface of the sliding seat plate (304). The slider two (404) is provided with an extension shaft. The transmission shaft (403) is provided with a combined spiral groove for the sliding of the extension shaft. The extension shaft is slidable in the combined spiral groove of the transmission shaft (403).

8. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 7, characterized in that: The synchronous belt transmission (402) is further provided with a tensioning wheel assembly (406) for real-time tensioning of the synchronous belt. The tensioning wheel assembly (406) is fixed on the line support of the conveying line body (210).

9. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 7, characterized in that: The number of the combined spiral grooves of the transmission shaft (403) is equal to the number of the flow channels of the parallel flow channel (300). Each of the combined spiral grooves comprises two spiral grooves with opposite rotation directions.

10. A multi-runner automatic pitch changing device for facilitating flexible robotic supply of plastic shells without vision according to claim 1, characterized in that: The number of the sensing detection modules (500) is equal to the number of the parallel flow channels (300), the sensing detection module (500) comprises a light emitting sensor (501) and a light receiving sensor (502), the sensor support (503) is connected to the door-shaped support three (130), a plurality of the sensor supports (503) are arranged on the door-shaped support three (130), the light emitting sensor (501) and the light receiving sensor (502) are both connected to the sensor support (503), the light emitting sensor (501) and the light receiving sensor (502) are respectively located outside the left side baffle (301) and the right side baffle (302) of each flow channel, the light receiving sensor (502) can receive the light emitted by the light emitting sensor (501), and the left side baffle (301) and the right side baffle (302) are provided with through holes for the light emitted by the light emitting sensor (501) to pass through.