Powder-liquid dual-chamber bag powder cavity gas replacement device

Abstract

The utility model relates to the field of powder and liquid double -chamber bag product discloses a powder and liquid double -chamber bag powder chamber gas displacement device, including nitrogen pipeline, gas curtain cover and vacuum mechanism, nitrogen pipeline one end communicates the top of gas curtain cover and the other end connects nitrogen gas source, and the vacuum mechanism includes vacuum collection box and vacuum pump, and the vacuum collection box is located inside gas curtain cover and is located bottom, and the powder and liquid double -chamber bag enters the gas curtain cover, and the powder chamber opens and opens vertically upwards, and the vacuum mechanism extracts the air in gas curtain cover, and nitrogen pipeline fills nitrogen into gas curtain cover. The utility model discloses a gas curtain cover to create relatively closed space, when the powder and liquid double -chamber bag on annular conveying supply system enters the gas curtain cover, movable baffle closes gas curtain cover, and extracts the air in gas curtain cover by vacuum pump, and then continuously fills nitrogen into gas curtain cover, thereby replacing the oxygen in powder chamber, reaches the effect that batch reduces the oxygen content in the powder chamber of powder and liquid double -chamber bag.

Description

Technical Field

[0001] This utility model relates to the field of powder-liquid dual-chamber bag products, and more particularly to a powder-liquid dual-chamber bag powder chamber gas replacement device. Background Technology

[0002] The powder-liquid dual-chamber bag is a ready-to-use infusion product. The bag body is made of a transparent co-extruded film. The product consists of two parts: a liquid chamber containing the injectable solvent and a powder chamber containing the drug powder. The two chambers are separated by a weakly welded partition. During use, medical personnel simply squeeze the liquid chamber to open the weakly welded partition, allowing the injectable solvent in the liquid chamber and the drug powder in the powder chamber to mix thoroughly before intravenous infusion.

[0003] After the powder is filled into the powder chamber of the powder-liquid dual-chamber bag product, it is not sealed immediately. The oxygen content in the powder chamber needs to be controlled first. Only products with a residual oxygen value lower than the set value can meet the qualification standard and then the powder chamber can be sealed.

[0004] The existing method for controlling the residual oxygen value in the powder chamber involves inserting an inflation needle into the chamber to inflate it with gas, such as nitrogen, before sealing. This method has a relatively small inflation volume and speed, which can easily cause powder dust to rise. This results in a long gas replacement time, slowing down production and increasing costs, making it unsuitable for commercial production. Therefore, improvements are needed. Utility Model Content

[0005] To address the problems existing in the prior art, the current methods for controlling the residual oxygen value in the powder chamber involve long gas replacement times, which slows down the production progress and results in high production costs, failing to meet the requirements for commercial production. The purpose of this invention is to provide a gas replacement device for the powder chamber of a powder-liquid dual-chamber bag. By setting up an air curtain to create a relatively sealed space, when the powder-liquid dual-chamber bag on the annular conveying supply system enters the air curtain, a movable baffle is used to seal the air curtain, and a vacuum pump is used to extract the air inside the air curtain. Subsequently, nitrogen is continuously injected into the air curtain, thereby replacing the oxygen in the powder chamber and achieving the effect of reducing the oxygen content in the powder chamber of the powder-liquid dual-chamber bag in batches.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A gas replacement device for a powder-liquid dual-chamber bag is disclosed, used to replace oxygen in the powder chamber of the powder-liquid dual-chamber bag. The device includes a nitrogen pipeline, an air curtain, and a vacuum mechanism. One end of the nitrogen pipeline is connected to the top of the air curtain, and the other end is connected to a nitrogen source. The vacuum mechanism includes a vacuum collection box and a vacuum pump. The vacuum collection box is located inside and at the bottom of the air curtain and is connected to the vacuum pump. After the powder-liquid dual-chamber bag enters the air curtain, the opening of the powder chamber of the bag opens vertically upwards. The vacuum mechanism is used to extract air from the air curtain, and the nitrogen pipeline fills the air curtain with nitrogen.

[0008] The present invention is further configured such that: the nitrogen pipeline includes a distribution pipe and a connecting pipe; a partition is vertically arranged inside the air curtain; the partition divides the upper space inside the air curtain into two or more independent chambers; a connector is connected to the top of each chamber; each connector is connected to the distribution pipe through a connecting pipe; and a vacuum collection box is correspondingly arranged at the bottom of each chamber.

[0009] The present invention is further configured such that: the nitrogen pipeline also includes a flow meter, and each of the connectors and the branch pipe is provided with a flow meter for controlling the flow rate of nitrogen.

[0010] The present invention is further configured such that: a flow divider is provided inside the air curtain, the flow divider is located in the upper space inside the air curtain and the four edges of the flow divider are in contact with the inner wall of the air curtain, and a plurality of through holes for airflow to pass through are evenly opened on the flow divider.

[0011] The present invention is further configured such that: the powder-liquid dual-chamber bag enters and exits the air curtain through a ring conveying supply system; the ring conveying supply system is provided with a number of spaced-apart limiting clamps for suspending and fixing the powder-liquid dual-chamber bag; the lowest end of the partition is higher than the limiting clamps and the highest point of the powder-liquid dual-chamber bag.

[0012] The present invention is further configured such that: a clamping strip is provided at the lower part of the air curtain, and the clamping strip works in conjunction with the limiting clamp to keep the powder chamber in the open state.

[0013] The present invention is further configured to include a sealing mechanism, wherein the air curtain is provided with a bag inlet and a bag outlet for the annular conveying supply system to pass through, and the sealing mechanism includes a first movable baffle and a second movable baffle, wherein the first movable baffle is used to block the bag inlet and the second movable baffle is used to block the bag outlet.

[0014] The present invention is further configured such that: the sealing mechanism includes a connecting rod and a driving member, the connecting rod is fixedly connected to both the first movable baffle and the second movable baffle, and the driving member drives the first movable baffle and the second movable baffle to move synchronously through the connecting rod.

[0015] In summary, the beneficial effects achieved by this utility model are as follows:

[0016] (1) After the powder-liquid dual-chamber bag enters the air curtain, the first and second movable baffles respectively block the bag inlet and outlet, making the air curtain relatively sealed. The vacuum mechanism works to extract the air inside the air curtain. Since the opening of the powder chamber of the powder-liquid dual-chamber bag is open, the oxygen-containing air in the powder chamber is continuously extracted. At the same time, as the nitrogen pipeline continuously fills the air curtain with nitrogen, the oxygen in the powder chamber is fully replaced by nitrogen, thereby reducing the oxygen content in the powder chamber and achieving the purpose of controlling the residual oxygen value in the powder chamber.

[0017] (2) The powder and liquid double chamber bag products are driven by the ring conveyor supply system through different process stations on the production line. The air curtain allows the ring conveyor supply system to pass directly through the air curtain and cooperates with the sealing mechanism to provide a relatively closed space for the gas replacement process, so that multiple powder and liquid double chamber bags can be processed in batches at the same time, which greatly improves production efficiency.

[0018] (3) The flow divider installed inside the air curtain can disperse the high-speed concentrated airflow in the nitrogen pipeline into a uniform and gentle airflow, preventing dust problems and making the gas replacement more uniform.

[0019] (4) The partitions inside the air curtain provide a relatively independent chamber for each powder-liquid double-chamber bag entering the air curtain, effectively avoiding the situation where the gas replacement degree of multiple powder-liquid double-chamber bags inside the air curtain is different, thus ensuring that after a certain gas replacement time, all powder-liquid double-chamber bags inside the air curtain have undergone thorough gas replacement.

[0020] (5) The vacuum mechanism can significantly accelerate the air discharge speed inside the air curtain, reduce nitrogen consumption, and accelerate the gas replacement efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the gas replacement device for the dual-chamber bag powder chamber in this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the air curtain in this utility model;

[0024] Figure 3 This is a schematic diagram showing the positional relationship between the air curtain and the two movable baffles.

[0025] Figure 4 This is a schematic diagram of the air curtain and sealing mechanism from a top-down perspective.

[0026] Figure 5 for Figure 2 A magnified view of part A in the middle;

[0027] Figure 6 This is a schematic diagram of the limiting clamp in this utility model.

[0028] In the diagram: 1. Nitrogen pipeline; 11. Filter; 12. Diverter pipe; 13. First connecting pipe; 14. Flow meter; 15. Second connecting pipe; 2. Air curtain; 21. Connector; 22. Diverter plate; 23. Bag inlet; 24. Bag outlet; 25. Clamp support bar; 251. Opening section; 252. Holding section; 253. Sealing section; 26. Partition plate; 3. Circular conveying supply system; 31. Limiting clamp; 311. Limiting post; 312. Long arm; 313. Rotating shaft; 314. Abutment rod; 4. Powder-liquid dual-chamber bag; 41. Powder chamber; 42. Liquid chamber; 43. Limiting hole; 5. Sealing mechanism; 51. First movable baffle; 52. Second movable baffle; 53. Connecting rod; 54. Driving component; 6. Vacuum mechanism; 61. Vacuum collection box; 62. Vacuum pipeline. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. For ease of explanation, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0030] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] As attached Figure 1-3As shown, a powder-liquid dual-chamber bag gas replacement device includes a nitrogen pipeline 1, an air curtain 2, a sealing mechanism 5, and a vacuum mechanism 6.

[0032] As attached Figure 2 , 5 As shown in Figure 6, the powder-liquid dual-chamber bag 4 is driven by the annular conveyor supply system 3 on the production line and thus passes through different process stations. The annular conveyor supply system 3 is an existing annular conveyor belt structure, and several limiting clamps 31 are equally spaced along the conveying direction of the annular conveyor supply system 3.

[0033] The limiting clamp 31 is also a special clamp in the prior art used to suspend and fix the powder and liquid double chamber bag 4. The limiting clamp 31 includes two sets of limiting posts 311 arranged symmetrically on the left and right, a long arm 312, a rotating shaft 313 and an abutment rod 314.

[0034] A horizontally positioned limiting post 311 is located at the top of the long arm 312. The upper and lower ends of the rotating shaft 313 are the long arm 312 and the short arm, respectively. The short arm and the long arm 312 can swing within a certain range about the axis of the rotating shaft 313. The short arm is fixedly connected to the outer inclined abutment rod 314, so the abutment rod 314 can also swing about the axis of the rotating shaft 313 with the long arm 312. Specifically, when the distance between the two abutment rods 314 decreases, the distance between the top ends of the two long arms 312 increases; and when the distance between the two abutment rods 314 increases, the distance between the top ends of the two long arms 312 decreases.

[0035] The powder-liquid dual-chamber bag 4 includes a powder chamber 41, a liquid chamber 42, and an opening. When the powder-liquid dual-chamber bag 4 is suspended on the limiting clamp 31, the powder chamber 41 is located above the liquid chamber 42, and the opening is located below the liquid chamber 42. A limiting hole 43 for suspending the bag is provided on each side of the top of the powder chamber 41. The distance between the two limiting holes 43 is matched with the distance between the two limiting posts 311, so that the powder-liquid dual-chamber bag 4 can be stably suspended and fixed on the limiting clamp 31 after the limiting holes 43 are fitted onto the limiting posts 311.

[0036] After the powder-liquid double-chamber bag 4 is carried by the annular conveying supply system 3 through the powder filling process, the powder chamber 41 is filled with powder raw materials. At this time, the opening of the powder chamber 41 is vertically upward. The powder chamber 41 is not directly sealed. Instead, the annular conveying supply system 3 sends the powder-liquid double-chamber bag 4 into the powder chamber inflation device of this utility model.

[0037] As attached Figure 1-4 As shown, the nitrogen pipeline 1 is used to fill the gas curtain 2 with nitrogen. The nitrogen pipeline 1 includes a filter 11, a branch pipe 12, a first connecting pipe 13, a flow meter 14, and a second connecting pipe 15, wherein the filter 11 and the flow meter 14 are existing devices in the prior art.

[0038] Filter 11 is used to filter nitrogen in the pipeline to prevent impurities in the gas source from entering the gas curtain hood 2. One end of filter 11 is connected to the nitrogen gas source, and the other end is connected to the diverter pipe 12.

[0039] The diverter pipe 12 is used to evenly distribute the nitrogen gas flow through the filter 11. In this embodiment, the diverter pipe 12 divides the nitrogen gas flow into four parts. Each of the four nitrogen pipelines connected to the air curtain 2 is equipped with a flow meter 14 for controlling the nitrogen flow rate.

[0040] On each nitrogen pipeline, the two ends of the first connecting pipe 13 are connected to the diverter pipe 12 and the flow meter 14, respectively, and the two ends of the second connecting pipe 15 are connected to the flow meter 14 and the connector 21 of the air curtain hood 2, respectively.

[0041] The air curtain 2 is a rectangular box structure with vertically arranged partitions 26 inside. The top of the partitions 26 is fixedly connected to the top of the air curtain 2. In this embodiment, three baffles are arranged inside the air curtain 2, thereby dividing the upper space inside the air curtain 2 into four independent chambers.

[0042] All connectors 21 are located outside the air curtain 2 and on top of the air curtain 2. Each chamber is connected to a corresponding connector 21, so that each nitrogen pipeline can be filled with nitrogen into a chamber individually.

[0043] The vacuum mechanism 6 includes a vacuum collection box 61, a vacuum pipeline 62, and a vacuum pump. The vacuum mechanism is used to extract air from the gas curtain 2, thereby accelerating the gas replacement efficiency.

[0044] The vacuum collection box 61 is flared and located inside and at the bottom of the air curtain 2. Each individual chamber has a vacuum collection box 61 at its bottom. The top end of the vacuum pipe 62 is connected to the bottom of the vacuum collection box 61, and the bottom end of the vacuum pipe 62 passes through the air curtain 2 and is connected to an external vacuum pump, thereby transferring the negative pressure generated by the vacuum pump to the vacuum collection box 61.

[0045] The air curtain hood 2 is provided with a bag inlet 23 and a bag outlet 24 in the conveying direction of the annular conveying supply system 3. Both the bag inlet 23 and the bag outlet 24 are notches opened on the side wall of the air curtain hood 2. The annular conveying supply system 3 drives the powder-liquid double chamber bag 4 to enter the air curtain hood 2 from the bag inlet 23 and exit from the bag outlet 24.

[0046] The sealing mechanism 5 includes a first movable baffle 51, a second movable baffle 52, a connecting rod 53, and a driving component 54.

[0047] The first movable baffle 51 and the second movable baffle 52 are both flat plate structures. The first movable baffle 51 is in close contact with the side of the air curtain 2 where the bag inlet 23 is opened, and the second movable baffle 52 is in close contact with the side of the air curtain 2 where the bag outlet 24 is opened.

[0048] The connecting rod 53 is horizontally positioned, with its two ends fixedly connected to the first movable baffle 51 and the second movable baffle 52, respectively. The driving component 54 is connected to the connecting rod 53 and can be a cylinder or other component capable of axial extension and retraction. The driving component 54, acting on the connecting rod 53, drives the first movable baffle 51 and the second movable baffle 52 to move synchronously.

[0049] The first movable baffle 51 and the second movable baffle 52 both have rectangular openings on the side away from the drive member 54, so as to avoid interference with the annular conveying and supply system 3 while sealing the air curtain 2.

[0050] When the powder-liquid dual-chamber bag 4 and the annular conveying and supply system 3 are located inside the air curtain hood 2, the lowest point of the partition 26 is still higher than the limit clamp 31 and the highest point of the powder-liquid dual-chamber bag 4, thereby avoiding interference and collision between the partition 26 and other structures.

[0051] An air curtain 2 has a flow divider 22 inside. The flow divider 22 is located below the connector 21 and in the upper space inside the air curtain 2. The flow divider 22 is a horizontally arranged flat plate structure, and its four edges are in complete contact with the inner wall of the air curtain 2. The flow divider 22 has several small circular holes evenly distributed on it to allow airflow to pass through. This allows the high-speed, concentrated nitrogen airflow entering from the connector 21 to be evenly dispersed into a gentle airflow after passing through the flow divider 22. This prevents the high-speed airflow from blowing directly into the powder chamber 41 below, causing powder to be blown away. At the same time, it makes the gas replacement inside each independent chamber of the air curtain 2 more uniform.

[0052] As attached Figure 2 , 5 As shown in Figure 6, the lower part of the air curtain hood 2 is provided with a clamping strip 25 that controls the opening or closing of the top opening of the powder chamber 41 by cooperating with the limiting clamp 31. The clamping strip 25 includes an opening section 251, a holding section 252, and a sealing section 253.

[0053] The position of the clamp support bar 25 is fixed, with its holding section 252 horizontally arranged. The opening section 251 and the sealing section 253 are located at opposite ends of the holding section 252. The opening section 251 is located at the end of the holding section 252 facing the bag inlet 23, and the sealing section 253 is located at the end of the holding section 252 facing the bag outlet 24. Furthermore, along the conveying direction of the annular conveying supply system 3, the opening section 251 is inclined upwards, while the sealing section 253 is inclined downwards.

[0054] The height of the upper surface of the maintaining section 252 is higher than the lowest point of the bottom abutment rod 314 of the limiting clamp 31 in the annular conveying supply system 3. After the powder raw material is filled into the powder chamber 41, the bag body in the powder chamber 41 is pulled because the distance between the two limiting holes 43 is approximately equal to the distance between the two limiting posts 311. Therefore, the opening at the top of the powder chamber 41 is in a nearly closed state. Before the limiting clamp 31 enters the air curtain 2, the limiting clamp 31 first contacts the opening section 251, and the abutment rod 314 abuts against the opening section 251 first. As the limiting clamp 31 enters the air curtain 2, the opening section 251 gradually lifts the limiting clamp 31, thereby causing the two abutment rods 314 on the same limiting clamp 31 to expand outward, driving the short arm fixedly connected to the abutment rod 314 to rotate at a certain angle in the direction away from each other, and then causing the two long arms 312 to rotate in the direction closer to each other. That is, the distance between the two limiting posts 311 on the limiting clamp 31 is reduced, thereby squeezing the bag in the powder chamber 41 and finally opening the opening at the top of the powder chamber 41.

[0055] When all four limiting clamps 31 are in their respective chambers for gas replacement, the horizontal holding section 252 ensures that the openings of the powder-liquid dual-chamber bag 4 on the four limiting clamps 31 remain open. When the gas replacement is completed, the limiting clamps 31 gradually pull the bag body in the powder chamber 41 as they pass through the sealing section 253 after leaving the air curtain 2, so that the opening of the powder chamber 41 gradually closes, effectively preventing a large amount of nitrogen gas from escaping from the powder chamber 41 due to the sudden closure of the opening of the powder chamber 41 during the process of leaving the air curtain 2.

[0056] The implementation principle of the above embodiments is as follows:

[0057] After the annular conveying supply system 3 carries four powder-liquid dual-chamber bags 4 into the air curtain hood 2, the driving component 54 of the sealing mechanism 5 drives the first movable baffle 51 and the second movable baffle 52 to block the bag inlet 23 and the bag outlet 24 on the air curtain hood 2. Then, the vacuum mechanism 6 works to continuously extract air from the air curtain hood 2. The opening of the powder chamber 41 of the powder-liquid dual-chamber bag 4 is in the open state under the action of the clamp support strip 25 and the limiting clamp 31, and the oxygen-containing air in the powder chamber 41 is continuously extracted. At the same time, the four nitrogen pipelines continuously fill the air curtain hood 2 with a set amount of nitrogen under the control of the flow meter 14. The nitrogen dispersed by the diverter 22 descends vertically to fully replace the oxygen-containing air in the powder chamber 41. After the set replacement time is reached, the drive unit 54 drives the first movable baffle 51 and the second movable baffle 52 to release the seal on the air curtain 2. The annular conveying supply system 3 then drives the four powder-liquid dual-chamber bags 4 to leave the air curtain 2. At this time, the oxygen in each powder chamber 41 is fully replaced by nitrogen, and the residual oxygen value in the powder chamber 41 reaches the standard. Furthermore, as the powder-liquid dual-chamber bags 4 leave the air curtain 2, the openings of the powder chambers 41 gradually close, thus allowing most of the nitrogen to be retained in the powder chambers 41, facilitating subsequent sealing of the powder chambers 41.

[0058] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A powder chamber gas replacement device for replacing oxygen in a powder chamber (41) of a powder-liquid dual-chamber bag (4), characterized by, The system includes a nitrogen pipeline (1), an air curtain (2), and a vacuum mechanism (6). One end of the nitrogen pipeline (1) is connected to the top of the air curtain (2), and the other end is connected to a nitrogen source. The vacuum mechanism (6) includes a vacuum collection box (61) and a vacuum pump. The vacuum collection box (61) is located inside the air curtain (2) and at the bottom of the air curtain (2). The vacuum collection box (61) is connected to the vacuum pump. After the powder-liquid double-chamber bag (4) enters the air curtain (2), the opening of the powder chamber (41) of the powder-liquid double-chamber bag (4) is opened and the opening of the powder chamber (41) is vertically upward. The vacuum mechanism (6) is used to extract the air inside the air curtain (2). The nitrogen pipeline (1) fills the air curtain (2) with nitrogen.

2. The powder gas replacement device according to claim 1, wherein The nitrogen pipeline (1) includes a branch pipe (12) and a connecting pipe. A partition (26) is vertically arranged inside the gas curtain (2). The partition (26) divides the upper space inside the gas curtain (2) into two or more independent chambers. Each chamber has a connector (21) at the top. Each connector (21) is connected to the branch pipe (12) through a connecting pipe. Each chamber has a vacuum collection box (61) at the bottom.

3. The powder gas replacement device according to claim 2, wherein The nitrogen pipeline (1) also includes a flow meter (14), and each connector (21) is provided with a flow meter (14) for controlling the flow rate of nitrogen between it and the branch pipe (12).

4. The powder gas replacement device according to claim 2, wherein A flow divider (22) is provided inside the air curtain (2). The flow divider (22) is located in the upper space inside the air curtain (2) and the four edges of the flow divider (22) are in contact with the inner wall of the air curtain (2). A number of through holes for airflow to pass through are evenly opened on the flow divider (22).

5. The powder gas replacement device according to claim 2, wherein The powder-liquid double-chamber bag (4) enters and exits the air curtain (2) through the annular conveying supply system (3). The annular conveying supply system (3) is provided with several spaced-apart limiting clamps (31) for suspending and fixing the powder-liquid double-chamber bag (4). The lowest point of the partition (26) is higher than the limiting clamps (31) and the highest point of the powder-liquid double-chamber bag (4).

6. The powder gas replacement device according to claim 5, wherein The lower part of the air curtain (2) is provided with a clamp support strip (25), which works in conjunction with the limiting clamp (31) to keep the powder chamber (41) in the open state.

7. The powder gas replacement device according to claim 5, wherein It also includes a sealing mechanism (5), on which the air curtain (2) has a bag inlet (23) and a bag outlet (24) through which the annular conveying supply system (3) passes. The sealing mechanism (5) includes a first movable baffle (51) and a second movable baffle (52). The first movable baffle (51) is used to block the bag inlet (23), and the second movable baffle (52) is used to block the bag outlet (24).

8. The powder-liquid dual-chamber bag gas replacement device according to claim 7, characterized in that, The sealing mechanism (5) further includes a connecting rod (53) and a driving member (54). The connecting rod (53) is fixedly connected to the first movable baffle (51) and the second movable baffle (52). The driving member (54) drives the first movable baffle (51) and the second movable baffle (52) to move synchronously through the connecting rod (53).

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