Feeding control device of conveying system
By designing a feeding device, including rollers and guide troughs, into the sorting and conveying system, and by using blocking components and controllers to precisely control the flow and position of liquid bags, the problem of easy breakage of liquid bags during transmission is solved, and efficient and safe liquid bag transmission is achieved.
Patent Information
- Application Number
- CN202423048898.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing sorting and conveying systems are prone to damage when transporting bagged items containing liquids. These bags are made of soft and fragile materials and are easily broken due to compression or impact, leading to liquid leakage and limiting their use.
A feeding control device for a conveying system is designed, comprising: a conveyor belt with multiple rolling conveyor tables, multiple rollers and guide troughs, and a blocking component and controller to precisely control the flow and position of the items to prevent accidental falling or collision.
It enables precise control of liquid bags, preventing breakage and leakage, and improving transmission efficiency and safety.
Smart Images

Figure CN223645757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material transfer technology, specifically to a feeding control device for a conveying system. Background Technology
[0002] With the rapid development of the logistics industry, sorting and conveying systems are becoming increasingly intelligent and automated. These systems employ advanced image recognition and automatic classification algorithms to accurately identify and categorize items to be transported. Through high-precision sensors and control systems, the systems can quickly determine the destination of items and are widely used in logistics centers, warehousing, and hospitals.
[0003] However, for bagged items containing liquids, such as hospital infusion bags, which are typically made of soft and relatively fragile materials like polyethylene, damage can easily occur during transport if subjected to compression, impact, or improper handling, leading to liquid leakage. Therefore, sorting and conveying systems face certain difficulties and challenges when transporting liquid bags, limiting their use in this application.
[0004] Therefore, existing technologies need further development. Utility Model Content
[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a feeding control device for a conveying system, so as to solve the technical problem that the conveying system is limited in its use when conveying bagged items containing liquid in related technologies.
[0006] To achieve the above technical objectives, the present invention adopts the following technical solution: A feeding control device for a conveying system is provided, comprising: a conveyor table with multiple rollers, each roller being driven to rotate to convey items placed on the conveyor table, with a gap between adjacent rollers; a guide trough connected to the conveyor table to allow items on the conveyor table to fall into the guide trough; a first blocking assembly disposed at the conveying end of the conveyor table, comprising a first baffle and a first driving component, the first driving component driving the first baffle to move within the gap, thereby preventing items at the end of the conveyor table from falling into the guide trough; a second blocking assembly disposed on the guide trough, the guide trough having a through hole, the second blocking assembly comprising a second baffle and a second driving component, the second driving component driving the second baffle to move within the through hole, thereby blocking the movement of items; and a controller connected to both the first and second driving components via signals.
[0007] Furthermore, the feeding control device of the conveying system also includes a third blocking component, which is set on the conveyor table. The third blocking component is located on the side of the first blocking component away from the guide groove. The third blocking component includes a third baffle and a third driving component. The third driving component drives the third baffle to move in the gap, thereby blocking the movement of the previous item at the end of the conveyor table.
[0008] Furthermore, the first driving component is a first motor, and the first blocking assembly also includes a fixed frame, which is fixed below the conveyor table. The first baffle passes through the fixed frame and enters the gap. The output shaft of the first motor passes through the fixed plate of the fixed frame and drives the first baffle to rise and fall.
[0009] Furthermore, the first blocking assembly also includes a cam and a follower. The output shaft of the first motor passes through the fixed plate and is connected to the cam. The follower is connected to the first baffle. The fixed plate is perpendicular to the conveyor table. The first motor drives the cam to rotate. The rotation axis of the cam is parallel to the conveyor table. When the cam rotates, it drives the follower to move up and down, thereby causing the follower to drive the first baffle to rise and fall.
[0010] Furthermore, the driven member includes a connecting rod and a roller. The roller is sleeved on the connecting rod, and the connecting rod is connected to the first baffle. When the cam rotates and contacts the roller, it causes the roller to rotate relative to the connecting rod.
[0011] Furthermore, a limiting groove is provided on the fixed plate, one end of the connecting rod is connected to the first baffle, and the other end of the connecting rod is located in the limiting groove. When the first baffle is raised or lowered, the connecting rod moves in the limiting groove.
[0012] Furthermore, the first blocking assembly also includes a reset assembly, which is fixed on the fixed frame. The reset assembly includes: a support rod with its two ends respectively disposed at both ends of the fixed frame and parallel to the fixed plate; and a slider fixed on the first baffle, with the support rod passing through the slider and movably disposed on the slider.
[0013] Furthermore, the reset assembly also includes a spring, one end of which is connected to the first baffle, and the other end of which is connected to the end of the fixed frame away from the conveyor. When the cam rotates and pushes the first baffle upward, the spring is in a stretched state. When the first motor stops rotating, the spring resets and pulls the first baffle downward to move the item at the end of the conveyor.
[0014] Furthermore, there are two support rods, two sliders, and two springs. Each support rod is located at both ends of the fixed frame, each slider is located at both ends of the first baffle, and each spring is located at both ends of the first baffle and the fixed frame.
[0015] Furthermore, the feeding control device of the conveying system also includes multiple sensors, each of which is used to monitor the position lifting status of the first baffle, the second baffle, and the third baffle; the controller is connected to the signals of each sensor.
[0016] Beneficial effects:
[0017] 1. The feeding control device of the conveying system of this utility model can accurately control the flow of materials in the conveyor table and guide trough through the precise control of the first blocking component and the second blocking component. The first blocking component can block the materials at the end of the conveyor table to prevent the materials from falling into the guide trough too early; the second blocking component further controls the movement of the materials in the guide trough to ensure that the materials stay in the appropriate position or continue to be conveyed, thereby achieving precise control of the feeding of the conveying system.
[0018] 2. The feeding control device of the conveying system of this utility model, with the addition of the third blocking component, further enhances the safety of the system. It can block the movement of the previous item at the end of the conveyor, prevent the items from accidentally accumulating or colliding during the control process, and thus protect the equipment and products from damage.
[0019] 3. The use of a motor drive and cam transmission mechanism, in conjunction with a return spring, ensures that the lifting and lowering action of the blocking component is stable and reliable.
[0020] 4. By setting up multiple sensors, the position lifting status of the blocking component can be monitored in real time, and the information can be fed back to the controller to realize the automated control of the conveying system. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the feeding control device of the conveying system used in this embodiment of the utility model from one perspective;
[0022] Figure 2 This is a structural schematic diagram of the feeding control device of the conveying system used in this embodiment of the utility model from another perspective;
[0023] Figure 3 This is a schematic diagram of the structure of the first blocking component used in an embodiment of the present invention from one perspective;
[0024] Figure 4 yes Figure 3 A magnified view of part A in the middle;
[0025] Figure 5 This is a structural schematic diagram of the first blocking component used in an embodiment of the present invention from another perspective.
[0026] The above figures include the following reference numerals:
[0027] 1. Conveyor; 11. Roller; 12. Gap; 2. Item; 3. Guide groove; 31. Through hole; 4. First blocking assembly; 41. First baffle; 42. First driving component; 421. First motor; 43. Fixing frame; 431. Fixing plate; 432. Limiting groove; 45. Cam; 46. Follower; 461. Connecting rod; 462. Roller; 47. Reset assembly; 471. Support rod; 472. Slider; 473. Spring; 5. Second blocking assembly; 51. Second baffle; 52. Second driving component; 6. Third blocking assembly; 61. Third baffle; 62. Third driving component; 7. Sensor; 8. Code reader; 9. Lifting device; 91. Conveyor belt; 92. Conveyor compartment. Detailed Implementation
[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0029] According to an embodiment of this utility model, a feeding control device for a conveying system is provided. Please refer to [link / reference]. Figures 1 to 5 The system includes: a conveyor 1, on which multiple rollers 11 are mounted, and each roller 11 is driven to rotate to convey an item 2 placed on the conveyor 1; a gap 12 is provided between adjacent rollers 11; a guide trough 3, which is connected to the conveyor 1 so that the item 2 on the conveyor 1 falls into the guide trough 3; a first blocking assembly 4, which is disposed at the conveying end of the conveyor 1, and includes a first baffle 41 and a first driving component 42, which drives the first baffle 41 to move within the gap 12, thereby preventing the item 2 at the end of the conveyor 1 from falling into the guide trough 3; a second blocking assembly 5, which is disposed on the guide trough 3, and has a through hole 31, which includes a second baffle 51 and a second driving component 52, which drives the second baffle 51 to move within the through hole 31, thereby preventing the item 2 from moving; and a controller, which is signal-connected to the first driving component 42 and the second driving component 52 respectively.
[0030] In this embodiment, item 2 is a liquid bag. The conveying system includes an initial feeding control device and a subsequent lifting device 9, thereby delivering a large number of liquid bags to different floors. The lifting device 9 mainly includes a conveyor belt 91 and a conveyor bin 92. The conveyor bin 92 is fixed on the conveyor belt 91 and moves with the cyclical operation of the conveyor belt 91. The guide trough 3 works in conjunction with the conveyor bin 92 to transfer the liquid bags from the feeding control device to the lifting device 9. In the feeding control device of the conveying system in this embodiment, the first baffle 41 shuttles through the gap 12 between the two rollers 11 at the end of the conveyor table 1, moving up and down in the gap 12 to prevent the liquid bags from entering the guide trough 3; the second baffle 51 passes through the through hole 31 on the guide trough 3, preventing the liquid bags in the guide trough 3 from sliding into the lifting device 9. Through the coordinated work of the first blocking component 4 and the second blocking component 5, the controller can accurately control when the items placed on the conveyor table 1 fall from the conveyor table into the guide trough. The first blocking component blocks the item at the end of the conveyor, ensuring that the liquid bag is released into the guide trough 3 at the appropriate time. The second blocking component 5 further controls the movement of the liquid bag in the guide trough 3, preventing the liquid bag from moving too fast or too slow, and avoiding accumulation or slippage of the liquid bag during the conveying process. This design enables the use of a highly efficient conveying system for liquid bags, thereby improving the transportation efficiency of bagged liquids. The feeding control device of the conveying system in this embodiment solves the technical problem of limited use of conveying systems in the related art for conveying bagged items containing liquids.
[0031] See Figure 1 , Figure 2 and Figure 3 The feeding control device of the conveying system in this embodiment further includes a third blocking component 6. The third blocking component 6 is disposed on the conveyor table 1, located on the side of the first blocking component 4 away from the guide trough 3. The third blocking component 6 includes a third baffle 61 and a third driving component 62. The third driving component 62 drives the third baffle 61 to move within the gap 12, thereby blocking the movement of the preceding item 2 at the end of the conveyor table 1. Because the third blocking component 6 is located on the side of the first blocking component 4 away from the guide trough 3, it can precisely block the movement of the preceding liquid bag at the end of the conveyor table 1 before the liquid bag slips out during liquid bag transport. This arrangement helps ensure that only one liquid bag is accurately released into the guide trough 3 at a time, thereby improving the accuracy of liquid bag handling.
[0032] See Figure 3In this embodiment, the feeding control device of the conveying system includes a first driving component 42, which is a first motor 421. The first blocking component 4 also includes a fixing frame 43, which is fixed below the conveyor table 1. The first baffle 41 passes through the fixing frame 43 and enters the gap 12. The output shaft of the first motor 421 passes through the fixing plate 431 of the fixing frame 43 and drives the first baffle 41 to rise and fall. The fixing frame 43 makes the installation of the first motor 421 and the first baffle 41 more stable, reducing the risk of loosening or damage to components due to vibration or impact.
[0033] See Figure 4 In this embodiment, the feeding control device of the conveying system includes a first blocking component 4, which further comprises a cam 45 and a follower 46. The output shaft of the first motor 421 passes through a fixed plate 431 and is connected to the cam 45. The follower 46 is connected to the first baffle 41. The fixed plate 431 is perpendicular to the conveyor table 1. The first motor 421 drives the cam 45 to rotate. The rotation axis of the cam 45 is parallel to the conveyor table 1. When the cam 45 rotates, it drives the follower 46 to move up and down, thereby causing the follower 46 to drive the first baffle 41 to rise and fall. The cam mechanism has a precise transmission ratio and positioning function. When the first motor 421 drives the cam 45 to rotate, the shape and contour of the cam 45 can ensure that the follower 46 moves up and down according to a predetermined trajectory, making the lifting position of the first baffle 41 more accurate, thereby improving the control accuracy of blocking and releasing the liquid bag.
[0034] See Figure 4 In this embodiment, the feeding control device of the conveying system includes a driven member 46 comprising a connecting rod 461 and a roller 462. The roller 462 is sleeved on the connecting rod 461, which is connected to the first baffle 41. When the cam 45 rotates and contacts the roller 462, it causes the roller 462 to rotate relative to the connecting rod 461. The contact between the roller 462 and the cam 45 is rolling friction. The resistance of rolling friction is small, which helps to extend the service life of the cam 45 and the roller 462 and reduce maintenance costs. Due to the rolling friction characteristics of the roller 462, the rotation of the cam 45 can be more efficiently converted into the lifting and lowering motion of the first baffle 41. This efficient transmission method helps to improve the working efficiency and stability of the entire feeding control device.
[0035] See Figure 4 In this embodiment, the feeding control device of the conveying system has a limiting groove 432 on the fixed plate 431. One end of the connecting rod 461 is connected to the first baffle 41, and the other end of the connecting rod 461 is located in the limiting groove 432. When the first baffle 41 rises or falls, the connecting rod 461 moves within the limiting groove 432. The limiting groove 432 guides and restricts the movement of the connecting rod 461, ensuring the stability of the first baffle 41 during the rising and falling process.
[0036] See Figure 5 In this embodiment, the feeding control device of the conveying system further includes a reset component 47 in the first blocking assembly 4. The reset component 47 is fixed on the fixed frame 43 and includes: a support rod 471, with its two ends respectively disposed at the two ends of the fixed frame 43, and the support rod 471 parallel to the fixed plate 431; and a slider 472, which is fixed on the first baffle 41. The support rod 471 passes through the slider 472 and is movably disposed on the slider 472. The reset component 47 helps to reduce the impact and vibration of the first baffle 41 during lifting and resetting processes.
[0037] See Figure 5 In this embodiment, the feeding control device of the conveying system includes a reset assembly 47 further comprising a spring 473. One end of the spring 473 is connected to the first baffle 41, and the other end of the spring 473 is connected to the end of the fixed frame 43 away from the conveyor table 1. When the cam 45 rotates, pushing the first baffle 41 upward, the spring 473 is in a stretched state. When the first motor 421 stops rotating, the spring 473 resets, pulling the first baffle 41 downward to move the item 2 at the end of the conveyor table 1. When the first motor 421 stops rotating, it can automatically provide a reset force to pull the first baffle 41 downward. On the other hand, the spring 473 can gradually release energy during the reset process, thereby reducing the mechanical impact between the first baffle 41 and the fixed frame 43.
[0038] See Figure 5 In this embodiment, the feeding control device of the conveying system has two support rods 471, two sliders 472, and two springs 473. Each support rod 471 is respectively disposed at both ends of the fixed frame 43, each slider 472 is respectively disposed at both ends of the first baffle 41, and each spring 473 is respectively located at both ends of the first baffle 41 and the fixed frame 43. By providing support rods 471, sliders 472, and springs 473 at both ends, the first baffle 41 can be ensured to remain balanced and stable during lifting and resetting, providing a smooth resetting environment for the springs 473.
[0039] See Figure 1 , Figure 2 and Figure 3The feeding control device of the conveying system in this embodiment also includes multiple sensors 7, each sensor 7 being used to monitor the position lifting status of the first baffle 41, the second baffle 51, and the third baffle 61 respectively; the controller is connected to each sensor 7. A barcode reader 8 is also installed at the front end of the conveyor 1. The barcode reader 8 can automatically read the barcode, QR code, or other identifiable identifier on the liquid bag, thereby quickly obtaining the liquid bag's transmission information. The controller transmits this information to the lifting device 9, prompting the transmission chamber 92 in the lifting device 9 to receive the information and transport the liquid bag to its destination. The sensors 7 can monitor the position lifting status of each baffle in real time, ensuring that the controller can obtain the latest status information immediately. This real-time monitoring and feedback mechanism helps to promptly detect and handle potential problems, helps to ensure the accurate blocking and release of the liquid bag during the conveying process, avoids problems such as liquid bag accumulation, misalignment, or leakage, and improves transmission efficiency and quality.
[0040] In the feeding control device of the conveying system in this embodiment, a photoelectric sensor is installed at the front end of the conveyor table 1, at the first baffle 41, and at the second baffle 51 to detect whether there is a liquid bag. Two sensors 7 are installed on each blocking component to detect the extended or retracted state of each baffle. In the initial state, the third baffle 61 is in the retracted state, and the first baffle 41 and the second baffle 51 are in the extended state. The controller automatically detects whether the sensor signals on each blocking component are correct to determine whether the position of each blocking component is correct. When the first liquid bag arrives at the front end of the conveyor table 1 (that is, when the feeding control device starts conveying the liquid bag), the photoelectric sensor placed under the conveyor table 1 senses the signal, and the barcode reader 8 is activated. When the liquid bag passes under the barcode reader 8, the barcode reader 8 takes a picture and identifies the destination floor information in the barcode information on the liquid bag, and transmits it to the controller. The controller records and tracks it. When the first liquid bag reaches the end of the conveyor belt 1, it is blocked by the first baffle 41. After the photoelectric sensor located below the first baffle 41 detects the signal, the controller controls the third drive component 62 to extend the third baffle 61, blocking the second liquid bag (from...). Figure 2 or Figure 3(Counting begins on the right side). Then, the first baffle 41 retracts, and the first liquid bag slides along the guide groove 3 to the extended second baffle 51. The photoelectric sensor located below the second baffle 51 detects the signal. When a certain transfer chamber 92 reaches a predetermined position, the signal is transmitted to the second drive component 52, causing the second baffle 51 to retract, and the liquid bag slides along the guide groove 3 into the transfer chamber 92, completing the feeding. When the first liquid bag slides into the guide groove 3 and reaches the second baffle 51, and the photoelectric sensor detects the signal, the third baffle 61 retracts, the second liquid bag reaches the third baffle 61, the third baffle 61 extends, and the third liquid bag reaches the front end of the conveyor table 1. This process is repeated to achieve continuous, one-by-one entry of liquid bags into the lifting device 9.
[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0042] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.
[0043] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0044] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0045] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A feeding control device for a conveying system, characterized in that, include: A conveyor (1) is provided with multiple rollers (11), each roller (11) is driven to rotate, thereby conveying the items (2) placed on the conveyor (1), and there is a gap (12) between two adjacent rollers (11). Guide groove (3), the guide groove (3) is connected to the conveyor (1) so that the item (2) on the conveyor (1) falls into the guide groove (3); The first blocking component (4) is disposed at the end of the conveying platform (1). The first blocking component (4) includes a first baffle (41) and a first driving component (42). The first driving component (42) drives the first baffle (41) to move in the gap (12), thereby preventing the item (2) at the end of the conveying platform (1) from falling into the guide groove (3). The second blocking component (5) is disposed on the guide groove (3), and the guide groove (3) is provided with a through hole (31). The second blocking component (5) includes a second baffle (51) and a second driving component (52). The second driving component (52) drives the second baffle (51) to move in the through hole (31), thereby blocking the movement of the item (2). The controller is signal-connected to the first drive component (42) and the second drive component (52), respectively.
2. The feeding control device for the conveying system according to claim 1, characterized in that, The feeding control device of the conveying system also includes a third blocking component (6), which is disposed on the conveyor table (1). The third blocking component (6) is located on the side of the first blocking component (4) away from the guide groove (3). The third blocking component (6) includes a third baffle (61) and a third driving component (62). The third driving component (62) drives the third baffle (61) to move in the gap (12), thereby blocking the movement of the previous item (2) of the item (2) at the end of the conveyor table (1).
3. The feeding control device for the conveying system according to claim 2, characterized in that, The first driving component (42) is a first motor (421), and the first blocking component (4) also includes a fixing frame (43). The fixing frame (43) is fixed below the conveyor (1). The first baffle (41) passes through the fixing frame (43) and enters the gap (12). The output shaft of the first motor (421) passes through the fixing plate (431) of the fixing frame (43) and drives the first baffle (41) to rise and fall.
4. The feeding control device for the conveying system according to claim 3, characterized in that, The first blocking assembly (4) further includes a cam (45) and a follower (46). The output shaft of the first motor (421) passes through the fixed plate (431) and is connected to the cam (45). The follower (46) is connected to the first baffle (41). The fixed plate (431) is perpendicular to the conveyor (1). The first motor (421) drives the cam (45) to rotate. The rotation axis of the cam (45) is parallel to the conveyor (1). When the cam (45) rotates, it drives the follower (46) to move up and down, thereby causing the follower (46) to drive the first baffle (41) to rise and fall.
5. The feeding control device for the conveying system according to claim 4, characterized in that, The driven member (46) includes a connecting rod (461) and a roller (462). The roller (462) is sleeved on the connecting rod (461). The connecting rod (461) is connected to the first baffle (41). When the cam (45) rotates and contacts the roller (462), it causes the roller (462) to rotate relative to the connecting rod (461).
6. The feeding control device for the conveying system according to claim 5, characterized in that, The fixed plate (431) is provided with a limiting groove (432). One end of the connecting rod (461) is connected to the first baffle (41), and the other end of the connecting rod (461) is located in the limiting groove (432). When the first baffle (41) is raised or lowered, the connecting rod (461) moves in the limiting groove (432).
7. The feeding control device for the conveying system according to claim 4, characterized in that, The first blocking assembly (4) further includes a reset assembly (47), which is fixed to the fixing frame (43). The reset assembly (47) includes: Support rod (471), the two ends of the support rod (471) are respectively disposed at the two ends of the fixing frame (43), and the support rod (471) is parallel to the fixing plate (431). A slider (472) is fixed on the first baffle (41), and a support rod (471) passes through the slider (472) and is movably disposed on the slider (472).
8. The feeding control device for the conveying system according to claim 7, characterized in that, The reset assembly (47) also includes a spring (473), one end of which is connected to the first baffle (41), and the other end of which is connected to the end of the fixing frame (43) away from the conveyor (1). When the cam (45) rotates and pushes the first baffle (41) to move upward, the spring (473) is in a stretched state. When the first motor (421) stops rotating, the spring (473) resets and pulls the first baffle (41) to move downward, so that the item (2) at the end of the conveyor (1) moves.
9. The feeding control device for the conveying system according to claim 8, characterized in that, There are two of each of the support rods (471), the sliders (472) and the springs (473). Each support rod (471) is respectively located at both ends of the fixed frame (43), each slider (472) is respectively located at both ends of the first baffle (41), and each spring (473) is respectively located at both ends of the first baffle (41) and the fixed frame (43).
10. The feeding control device for the conveying system according to claim 3, characterized in that, The feeding control device of the conveying system also includes multiple sensors (7), each of which is used to monitor the position lifting status of the first baffle (41), the second baffle (51) and the third baffle (61); the controller is connected to each of the sensors (7) by signal.