A rapid cleaning device and method for hot-rolled strip steel.

Abstract

This invention relates to the field of steel rolling equipment technology, and proposes a rapid strip cleaning device and method for hot rolling mills. The device is installed within a hot rolling mill, which includes a support frame and multiple conveying rollers. The conveying rollers are distributed parallel and spaced on the support frame. The hot rolling mill conveys heated steel plates and includes support rods. One end of each support rod is oscillating relative to the support frame. Multiple support rods are present, with one support rod positioned between adjacent conveying rollers. The oscillating support rods engage with or disengage from the steel plate. A first telescopic component is mounted on the support frame and drives the support rods to oscillate. This technical solution solves the problem of low efficiency in manual cleaning after strip breakage during hot rolling in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of steel rolling equipment technology, specifically to a rapid cleaning device for hot rolling mill strip. Background Technology

[0002] Strip breakage is a common and serious accident that significantly impacts production efficiency and costs during hot rolling of strip steel. Many factors can cause strip breakage during rolling, such as defects in the intermediate slab shape, electrical or hydraulic system malfunctions, excessive deformation in a single pass, and work roll bursting. When a strip breakage occurs, a large amount of steel sheet remains on the roller table, hindering continuous production and requiring rapid removal. Current cleaning methods involve workers using flame cutting torches to cut large steel sheets into sections, then cutting lifting lugs on each section before using overhead cranes to remove them. This process is time-consuming and reduces hot rolling line output. Furthermore, due to the high temperatures and inherent dangers of hot rolling, manual cleaning is not only extremely labor-intensive but also poses a safety threat to workers. Its low efficiency also significantly extends production line downtime. Summary of the Invention

[0003] This invention proposes a rapid strip cleaning device for hot rolling mills, which solves the problem of low efficiency in manual cleaning after strip breakage during hot rolling in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] A rapid strip cleaning device for hot-rolled steel sheets is provided, for installation within a hot-rolled steel sheet conveyor. The hot-rolled steel sheet conveyor includes a support frame and multiple conveying rollers, the multiple conveying rollers being distributed parallel and spaced apart on the support frame. The hot-rolled steel sheet conveyor is used to convey heated steel sheets.

[0006] A support rod is provided, one end of which is swaying relative to the support frame. There are multiple support rods, and each support rod is provided between two adjacent conveying rollers. After the support rod sways, it is used to abut against the steel plate or to cancel the abutment.

[0007] A first telescopic member is mounted on the support frame and is used to drive the support rod to swing.

[0008] Optionally, the first telescopic member is slidably disposed relative to the support frame, and further includes:

[0009] A sliding seat is slidably mounted on the support rod, and the telescopic end of the first telescopic member is hinged to the sliding seat;

[0010] The second telescopic member is disposed on the support frame and is used to drive the first telescopic member to slide.

[0011] Optionally, it also includes:

[0012] A baffle is swayably disposed at one end of the support rod. After swaying, the baffle is parallel or perpendicular to the support rod. The baffle and the second telescopic member are respectively located at both ends of the support rod.

[0013] Optionally, the baffle extends out of the support frame after it is parallel to the support rod.

[0014] Optionally, the support frame has a lifting frame located below the conveying roller, the support rod is swaying on the lifting frame, and the first telescopic member and the second telescopic member are both located on the lifting frame.

[0015] Optionally, it also includes:

[0016] A slide rail, which is mounted on the lifting frame;

[0017] A translation seat is slidably mounted on the slide rail, a first telescopic member is mounted on the translation seat, and the telescopic end of the second telescopic member is mounted on the translation seat.

[0018] Optionally, it also includes:

[0019] A limiting seat is disposed on the lifting frame and located at one end near the baffle;

[0020] A limiting rod is provided at one end on the baffle, and at the other end is used to abut against the end of the limiting seat near the baffle. After the limiting rod extends out of the limiting seat, the baffle swings and becomes parallel to the support rod.

[0021] Optionally, it also includes:

[0022] A return spring, the two ends of which act on the support rod and the baffle respectively, to provide a force that keeps the support rod parallel after the baffle swings.

[0023] Optionally, the limiting seat has a limiting inclined surface near the limiting rod, the limiting inclined surface is arc-shaped, and the limiting rod has an arc-shaped abutment part near the limiting seat, the arc-shaped abutment part having the same curvature as the limiting inclined surface.

[0024] The present invention also proposes a method for rapid cleaning of hot-rolled strip steel, using a rapid cleaning device for hot-rolled strip steel.

[0025] The working principle and beneficial effects of this invention are as follows:

[0026] In this invention, a support rod is installed on the support frame of the hot rolling mill, between two adjacent conveyor rollers. A first telescopic component is installed on the support frame, ensuring its connection with the support rod. When it is necessary to clean the steel plate after strip breakage, the first telescopic component is activated, extending it and causing the support rod to swing around the hinge point. After strip breakage, the steel plate still falls on the conveyor roller. By controlling the first telescopic component, the support rod swings upward until it abuts against the steel plate. At this point, the steel plate is gradually lifted under the action of the support rod, allowing it to be cleaned out of the rolling mill area. When the cleaning work is completed or the support rod is no longer needed, the first telescopic component is operated again, causing the support rod to swing in the opposite direction, returning to the space between the conveyor rollers. The height of the support rod is lower than the conveyor rollers so that normal strip conveying operations can resume. After the steel plate is cleaned out of the hot rolling mill, the operator can further collect and recycle it.

[0027] This invention provides an effective method for cleaning steel plates after strip breakage on hot rolling mill rollers. By installing swingable support rods between adjacent conveyor rollers and controlling their swing using a first telescopic component, the steel plates scattered on the rollers after strip breakage can be precisely processed. Compared to traditional manual cleaning methods, this significantly reduces manpower input, improves cleaning efficiency, and reduces the workload and risks for workers in the high-temperature and hazardous hot rolling environment. The process of removing the steel plates from the hot rolling mill rollers requires less involvement of large hoisting equipment, making operation more convenient. Simultaneously, the structural design is relatively simple, easy to install and maintain, and can effectively shorten the downtime of the production line due to strip breakage cleaning, improve overall production efficiency, and reduce economic losses caused by downtime. Attached Figure Description

[0028] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the hot rolling mill structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the first state structure of the support rod of the present invention;

[0032] Figure 4 This is a schematic diagram of the second state structure of the support rod of the present invention;

[0033] Figure 5 This is a schematic diagram of the third state structure of the support rod of the present invention.

[0034] In the figure: 1. Hot rolling roller, 11. Support frame, 12. Conveyor roller, 2. Support rod, 3. First telescopic component, 4. Sliding seat, 5. Second telescopic component, 6. Baffle, 13. Lifting frame, 7. Translation seat, 8. Limiting seat, 9. Limiting rod, 81. Limiting inclined surface, 91. Arc-shaped abutment part. Detailed Implementation

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0036] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0037] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Reference Figures 1-5 In the first embodiment of the present invention, a rapid strip cleaning device for hot rolling mill is proposed, which is installed in a hot rolling mill 1. The hot rolling mill 1 includes a support frame 11 and multiple conveying rollers 12. The multiple conveying rollers 12 are distributed in parallel and spaced on the support frame 11. The hot rolling mill 1 is used to convey heated steel plates. It includes support rods 2, one end of which is oscillating relative to the support frame 11. There are multiple support rods 2, and a support rod 2 is provided between two adjacent conveying rollers 12. After the support rod 2 oscillates, it is used to abut against or cancel the abutment with the steel plate. A first telescopic member 3 is provided on the support frame 11 and is used to drive the support rod 2 to oscillate.

[0040] In this embodiment, a support rod 2 is installed on the support frame 11 of the hot rolling mill 1, between two adjacent conveyor rollers 12. A first telescopic member 3 is installed on the support frame 11, ensuring its connection to the support rod 2. When it is necessary to clean the steel plate after strip breakage, the first telescopic member 3 is activated to extend it, thereby causing the support rod 2 to swing around the hinge point. After strip breakage, the steel plate still falls on the conveyor roller 12. By controlling the first telescopic member 3, the support rod 2 swings upward until it contacts the steel plate. At this time, the steel plate is gradually lifted under the action of the support rod 2, allowing it to be cleaned out of the rolling mill area. When the cleaning work is completed or the support rod 2 is no longer needed, the first telescopic member 3 is operated again to swing the support rod 2 in the opposite direction, returning it to the space between the conveyor rollers 12. The height of the support rod 2 is lower than the conveyor roller 12 so that normal strip conveying operations can resume. After the steel plate is cleaned out of the hot rolling mill 1, the operator can further collect and recycle it.

[0041] This invention provides an effective method for cleaning steel plates after strip breakage on a hot rolling mill roller table 1. By installing swingable support rods 2 between adjacent conveyor rollers 12 and controlling their swing using a first telescopic member 3, the steel plates scattered on the roller table after strip breakage can be precisely processed. Compared to traditional manual cleaning methods, this significantly reduces manpower input, improves cleaning efficiency, and reduces the workload and risks for workers in the high-temperature and hazardous hot rolling environment. The process of removing the steel plates from the hot rolling mill roller table 1 reduces the need for large hoisting equipment, making operation more convenient. At the same time, the structural design is relatively simple, easy to install and maintain, and can effectively shorten the downtime of the production line due to strip breakage cleaning, improve overall production efficiency, and reduce economic losses caused by downtime.

[0042] Furthermore, the first telescopic member 3 is slidably disposed relative to the support frame 11, and also includes a sliding seat 4, which is slidably disposed on the support rod 2, and the telescopic end of the first telescopic member 3 is hingedly disposed on the sliding seat 4; the second telescopic member 5 is disposed on the support frame 11, and the second telescopic member 5 is used to drive the first telescopic member 3 to slide.

[0043] In this embodiment, the first telescopic member 3 is mounted on the sliding seat 4, which can slide freely on the support rod 2. Simultaneously, a second telescopic member 5 is installed on the support frame 11, with its telescopic end connected to the first telescopic member 3. The first telescopic member 3 is activated first, causing the support rod 2 to swing and contact the steel plate for cleaning. Simultaneously, the second telescopic member 5 is activated, pushing the first telescopic member 3 to slide along the support rod 2 to a suitable position. Through the cooperation of the first telescopic member 3 and the second telescopic member 5, the first telescopic member 3 can extend a shorter distance to swing the support rod 2 at a larger angle, resulting in better stability of the support rod 2's swing. The arrangement of the sliding seat 4 and the second telescopic member 5 allows the first telescopic member 3 to move flexibly on the support rod 2, facilitating a faster restoration of normal operation of the hot rolling production line.

[0044] Furthermore, it also includes a baffle 6, which is swayed at one end of the support rod 2. After swaying, the baffle 6 is parallel or perpendicular to the support rod 2. The baffle 6 and the second telescopic member 5 are located at the two ends of the support rod 2, respectively.

[0045] In this embodiment, a baffle 6 is installed at one end of the support rod 2, allowing the baffle 6 to swing around its connection point with the support rod 2. Under normal conditions, the baffle 6 is perpendicular to the support rod 2, preventing insufficient swing angle of the support rod 2 and ensuring the steel plate on it can slide off to one side of the hot rolling mill 1. After the support rod 2 swings to its designated position, the baffle 6 swings to a position parallel to the support rod 2, allowing the steel plate to slide off smoothly. The design of the baffle 6 reduces the need for additional cleaning tools, improving the integration and practicality of the equipment. When handling complex cleaning tasks after strip breakage, it enables more efficient cleaning, further shortening cleaning time, increasing the recovery speed of the production line, and reducing the risk of subsequent equipment malfunctions due to incomplete cleaning.

[0046] Furthermore, after the baffle 6 is parallel to the support rod 2, one end extends out of the support frame 11.

[0047] In this embodiment, when the baffle 6 is parallel to the support rod 2, one end of the baffle 6 extends out of the support frame 11. During the actual cleaning process, as the support rod 2 swings into position, the baffle 6 extending out of the support frame 11 can smoothly guide the steel plate to one side of the hot rolling mill 1. A collection device can be set on the extension line after the support rod 2 swings into position, so that the steel plate can smoothly slide into the collection device, which facilitates the recycling and reuse of the steel plate by the staff and improves the integrity of the overall cleaning.

[0048] Furthermore, the support frame 11 has a lifting frame 13, which is located below the conveying roller 12. The support rod 2 is swayed on the lifting frame 13, and the first telescopic member 3 and the second telescopic member 5 are both located on the lifting frame 13.

[0049] In this embodiment, a lifting frame 13 is installed inside the support frame 11, and the swing shaft of the support rod 2 is mounted on the lifting frame 13. The first telescopic member 3 and the second telescopic member 5 are also fixed to the lifting frame 13. The lifting frame 13 facilitates the height adjustment of the support rod 2, avoiding interference with the normal steel plate conveying operation of the hot rolling mill 1. When a strip breakage occurs and steel plates accumulate on the hot rolling mill 1, the lifting device of the lifting frame 13 is activated, causing the lifting frame 13 to rise, thereby lifting the support rod 2, the first telescopic member 3, and the second telescopic member 5 as a whole. This allows the support rod 2 to better contact the accumulated steel plates and perform cleaning operations during its swing. After cleaning, the lifting frame 13 is lowered back to its initial position for normal strip conveying or other cleaning operations. This improves the adaptability and cleaning efficiency of the equipment, ensuring rapid and comprehensive cleaning work under various strip breakage conditions, reducing downtime caused by cleaning difficulties, and improving the overall operating efficiency of the production line.

[0050] Furthermore, it also includes a slide rail, which is mounted on the lifting frame 13; the translation seat 7 is slidably mounted on the slide rail, the first telescopic member 3 is mounted on the translation seat 7, and the telescopic end of the second telescopic member 5 is mounted on the translation seat 7.

[0051] In this embodiment, a slide rail is installed on the lifting frame 13, and the translation seat 7 is installed on the slide rail, allowing the translation seat 7 to slide freely on the slide rail. The first telescopic member 3 is fixed to the translation seat 7, and the telescopic end of the second telescopic member 5 is connected to the translation seat 7. When cleaning the broken strip steel plate, the second telescopic member 5 is activated, pushing the translation seat 7 to slide on the slide rail, thereby driving the first telescopic member 3 to move. Then, the support rod 2 is controlled to swing and abut against the steel plate through the first telescopic member 3 for cleaning. This improves the cleaning flexibility of the cleaning equipment in the transverse direction of the roller conveyor. During the broken strip cleaning process, the steel plate is often unevenly distributed in the transverse direction. This design allows the support rod 2 to be adjusted in the transverse position to better adapt to this uneven distribution. Through the cooperation of the translation seat 7 and the slide rail, the first telescopic member 3 can be quickly moved to the area where the steel plate needs to be piled up, improving the support of the support rod 2 for the steel plate, making the stability of the entire cleaning equipment better, helping to quickly restore the normal operation of the hot rolling production line, and also improving the adaptability and versatility of the equipment to different broken strip conditions.

[0052] Furthermore, it also includes a limiting seat 8, which is mounted on the lifting frame 13 and located at one end near the baffle 6; one end of the limiting rod 9 is mounted on the baffle 6, and the other end is used to abut against the end of the limiting seat 8 near the baffle 6. After the limiting rod 9 extends out of the limiting seat 8, the baffle 6 swings and becomes parallel to the support rod 2.

[0053] In this embodiment, a limiting seat 8 is installed on the lifting frame 13 near the end of the baffle 6, and a limiting rod 9 is installed on the baffle 6. When the support rod 2 has not swung to its position, the limiting rod 9 abuts against the limiting seat 8, and the baffle 6 cannot swing at this time. When the support rod 2 swings to its position, the limiting rod 9 slides out of the end of the limiting seat 8, and the baffle 6 swings under the action of the steel plate, allowing the steel plate to slide smoothly down the support rod 2. Through the cooperation of the limiting rod 9 and the limiting seat 8, the swing of the baffle 6 can be quickly controlled without additional control, and the accuracy and consistency of the baffle 6 swinging to the parallel position each time are ensured. Precise control of the baffle 6 swinging to the parallel position is achieved. This avoids the situation where the steel plate cannot slide down or damages the equipment due to the inaccurate position of the baffle 6. It improves the reliability and stability of the cleaning operation, enabling the equipment to operate more efficiently and safely when handling cleaning tasks, and helps to improve the overall cleaning quality and the service life of the equipment.

[0054] Furthermore, it also includes a return spring, with its two ends acting on the support rod 2 and the baffle 6 respectively, to provide a force that keeps the support rod 2 parallel after the baffle 6 swings.

[0055] In this embodiment, a return spring is installed between the support rod 2 and the baffle 6. When the baffle 6 swings to a state parallel to the support rod 2 under the action of the steel plate, the steel plate slips, and the return spring activates. For example, after the cleaning task is completed, the external force exerted by the steel plate on the swinging of the baffle 6 is released. At this time, due to its own elastic restoring force, the return spring pulls the baffle 6 to swing in the opposite direction around the connection point until the baffle 6 returns to its initial state perpendicular to the support rod 2. In this way, without additional complex control devices, the baffle 6 can automatically return to its normal position when no special cleaning is required, so as to carry out normal steel plate conveying and other cleaning operations. This simplifies the reset operation of the baffle 6 and improves the automation level of the equipment. During the use of the cleaning equipment, the setting of the return spring allows the baffle 6 to automatically return to its initial position, reducing manual intervention and complex control programs. This not only improves the ease of operation of the equipment, but also reduces the failure rate and maintenance costs of the equipment, and improves the overall cleaning efficiency and the operating efficiency of the production line.

[0056] Furthermore, the limiting seat 8 has a limiting inclined surface 81 near the limiting rod 9, the limiting inclined surface 81 is arc-shaped, and the limiting rod 9 has an arc-shaped abutment part 91 near the limiting seat 8, the arc-shaped abutment part 91 is equal in curvature to the limiting inclined surface 81.

[0057] In this embodiment, the limiting slope 81 of the limiting seat 8 near the limiting rod 9 is designed to be arc-shaped, and the arc-shaped abutment part 91 of the limiting rod 9 near the limiting seat 8 is machined to have the same arc as the limiting slope 81. When the baffle 6 swings, the limiting rod 9 swings along with it and gradually approaches the limiting seat 8. Due to the good match between the arc-shaped abutment part 91 and the limiting slope 81, the limiting rod 9 can slide smoothly along the limiting slope 81 during the abutment process, thereby allowing the baffle 6 to swing smoothly to a position parallel to the support rod 2. The arc-shaped contact between the limiting rod 9 and the limiting slope 81 reduces collisions and jamming, allowing the support rod 2 to swing smoothly into position. After the support rod 2 is in position, the limiting rod 9 slides out of the limiting slope 81. At this time, the baffle 6 swings under the action of the steel plate, ensuring that the baffle 6 smoothly reaches a position parallel to the support rod 2, improving the smoothness and reliability of the cleaning operation. This improves the stability and reliability of the baffle 6 during the swing process. The coordinated design of the arc-shaped limiting slope 81 and the arc-shaped abutment part 91 optimizes the movement process of the baffle 6 when it swings to the parallel position, avoiding collisions and jamming caused by right angles or other shaped limiting structures. This reduces equipment wear and the risk of failure, improves the accuracy and efficiency of cleaning operations, helps extend the service life of the equipment, and ensures the stability of cleaning quality.

[0058] A method for rapid cleaning of hot-rolled strip steel on a roller table, using a rapid cleaning device for hot-rolled strip steel on a roller table.

[0059] This embodiment proposes a rapid strip cleaning method for hot-rolled conveyor rollers. By setting a swingable support rod 2 between adjacent conveyor rollers 12 and controlling its swing using a first telescopic member 3, the method can accurately handle the steel plates scattered on the roller conveyor after strip breakage. Compared with traditional manual cleaning methods, this significantly reduces manpower input, improves cleaning efficiency, and reduces the workload and risks for workers in the high-temperature and hazardous hot rolling environment. The process of removing the steel plates from the hot-rolled conveyor roller 1 reduces the involvement of large hoisting equipment, making operation more convenient. At the same time, the structural design is relatively simple, easy to install and maintain, and can effectively shorten the downtime of the production line due to strip breakage cleaning, improve overall production efficiency, and reduce economic losses caused by downtime.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rapid strip cleaning device for hot-rolled steel sheets, used to be installed in a hot-rolled steel sheet conveyor (1), the hot-rolled steel sheet conveyor (1) comprising a support frame (11) and a plurality of conveying rollers (12), the plurality of conveying rollers (12) being distributed in parallel at intervals on the support frame (11), the hot-rolled steel sheet conveyor (1) being used to convey heated steel sheets, characterized in that, include: Support rod (2), one end of the support rod (2) is swaying relative to the support frame (11), there are multiple support rods (2), and the support rod (2) is provided between two adjacent conveying rollers (12). The support rod (2) is used to abut against the steel plate or cancel the abutment after swinging. The first telescopic member (3) is disposed on the support frame (11). The first telescopic member (3) is slidably disposed relative to the support frame (11). The first telescopic member (3) is used to drive the support rod (2) to swing. The sliding seat (4) is slidably disposed on the support rod (2), and the telescopic end of the first telescopic member (3) is hinged to the sliding seat (4); The second telescopic member (5) is disposed on the support frame (11) and is used to drive the first telescopic member (3) to slide. A baffle (6) is swayed at one end of the support rod (2). After swaying, the baffle (6) is parallel or perpendicular to the support rod (2). The baffle (6) and the second telescopic member (5) are located at the two ends of the support rod (2). The support frame (11) has a lifting frame (13). The lifting frame (13) is located below the conveying roller (12). The support rod (2) is swayed on the lifting frame (13). The first telescopic member (3) and the second telescopic member (5) are both located on the lifting frame (13). Limiting seat (8), the limiting seat (8) is disposed on the lifting frame (13) and located at one end near the baffle (6); A limiting rod (9) is provided at one end on the baffle (6) and at the other end for abutting against the end of the limiting seat (8) near the baffle (6). After the limiting rod (9) extends out of the limiting seat (8), the baffle (6) swings and becomes parallel to the support rod (2). The limiting seat (8) has a limiting inclined surface (81) near the limiting rod (9), which is arc-shaped. The limiting rod (9) has an arc-shaped abutting part (91) near the limiting seat (8), which has the same curvature as the limiting inclined surface (81).

2. The rapid cleaning equipment for hot-rolled strip steel according to claim 1, characterized in that, The baffle (6) extends out of the support frame (11) after it is parallel to the support rod (2).

3. The rapid cleaning equipment for hot-rolled strip steel according to claim 2, characterized in that, Also includes: A slide rail is mounted on the lifting frame (13); The translation seat (7) is slidably disposed on the slide rail, the first telescopic member (3) is disposed on the translation seat (7), and the telescopic end of the second telescopic member (5) is disposed on the translation seat (7).

4. The rapid cleaning equipment for hot-rolled strip steel according to claim 3, characterized in that, Also includes: A reset spring is provided, with its two ends acting on the support rod (2) and the baffle (6) respectively, to provide a force that keeps the support rod (2) parallel after the baffle (6) swings.

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