Air field adjusting structure and air field adjusting method of quick-freezing device

Abstract

The application relates to a quick-freezing device air field adjusting structure and an air field adjusting method. The quick-freezing device air field adjusting structure comprises a shell assembly, a conveying mesh belt arranged in the shell assembly and used for conveying frozen objects, an upper hole plate arranged above the conveying mesh belt, a fixed connection point and at least one sliding connection point, the fixed connection point is fixedly connected with the shell assembly, the sliding connection point is slidingly connected with the shell assembly, the upper hole plate comprises a plurality of rotationally connected hole plate pieces, at least one driving assembly connected with the upper hole plate and used for stretching or compressing the plurality of hole plate pieces with the fixed connection point as the center to adjust the included angle between the plurality of hole plate pieces, so as to adjust the air field around the frozen objects. The quick-freezing device air field adjusting structure can solve the problem that the existing impact type quick-freezing device cannot adjust the air field around the frozen objects, and the heat transfer efficiency of the impact type quick-freezing device is poor, the freezing effect is poor, and the freezing time is long.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and particularly to a wind field adjustment structure and method for a quick-freezing device. Background Technology

[0002] A quick-freezing machine is a highly efficient freezing device that can freeze a large number of products in a short time. There are various types of quick-freezing machines, such as push-type quick-freezing machines, reciprocating quick-freezing machines, plate quick-freezing machines, and impact quick-freezing machines. Among them, the impact quick-freezing machine uses a high-speed jet of air to impact the surface of the goods. The gas jet breaks the stagnant boundary layer on the surface of the goods, which increases the heat transfer coefficient and accelerates the freezing rate of the goods.

[0003] When using an impact freezer, high-speed cold air blown out by a cold air blower enters a static pressure chamber, where it is converted from dynamic pressure to static pressure. At the outlet of the static pressure chamber, the air is accelerated by perforated plates located above and / or below the conveyor belt and then impacts the surface of the items to be frozen for freezing. Different items to be frozen generally require different airflow patterns to improve freezing efficiency. However, existing impact freezers cannot adjust the airflow distribution within the freezing zone and the airflow around the items to be frozen, resulting in poor heat transfer efficiency, poor freezing effect, and long freezing time. Summary of the Invention

[0004] This invention provides a wind field adjustment structure and method for a quick-freezing device, which can solve the problems of existing impact quick-freezing devices that cannot adjust the wind field around the items to be frozen, resulting in poor heat transfer efficiency, poor freezing effect, and long freezing time.

[0005] In a first aspect, embodiments of the present invention provide a wind field adjustment structure for a quick-freezing device, comprising: Housing assembly; A conveyor belt, located within the housing assembly, is used to transport items to be frozen; An upper perforated plate, disposed above the conveyor belt, has a fixed connection point and at least one sliding connection point. The fixed connection point is fixedly connected to the housing assembly, and the sliding connection point is slidably connected to the housing assembly. The upper perforated plate includes a plurality of rotatably connected perforated plate pieces. At least one drive component is connected to the upper perforated plate and is used to stretch or compress the multiple perforated plates around the fixed connection point to adjust the included angle between the multiple perforated plates, so as to adjust the air field around the item to be frozen.

[0006] In one embodiment, the housing assembly includes: At least one suspension rail is provided with a fixed suspension rod and a sliding suspension rod, wherein the fixed suspension rod is connected to the fixed connection point and the sliding suspension rod is connected to the sliding connection point; The lower housing is connected to the hanging rail, and the conveyor belt is installed inside it, with the drive assembly mounted on it.

[0007] In one embodiment, the at least one hanging rail is a plurality of hanging rails, which are spaced apart along the width direction of the housing assembly.

[0008] In one embodiment, the upper perforated plate includes: Shaft; The plurality of perforated plates are rotatably connected to adjacent perforated plates via the rotating shaft; Both the fixed connection point and the sliding connection point are located on the rotating shaft. The fixed connection point is located at the beginning or end of the upper perforated plate, and the sliding connection point is located at the end away from the fixed connection point.

[0009] In one embodiment, the upper perforated plate includes: Shaft; The plurality of perforated plates are rotatably connected to adjacent perforated plates via the rotating shaft; The fixed connection point and the sliding connection point are both located on the rotating shaft. The fixed connection point is located in the middle of the upper hole plate. The at least one sliding connection point is two sliding connection points, which are located on both sides of the fixed connection point. The at least one driving component is two driving components, which are connected to the first end and the last end of the upper hole plate, respectively.

[0010] In one embodiment, the quick-freezing device airflow adjustment structure further includes a lower perforated plate located below the conveyor belt and connected to the housing assembly.

[0011] In one embodiment, the driving component includes: Drive motor; The transmission lead screw is connected to the drive motor; A nut seat is provided on the transmission lead screw and is connected to the upper hole plate through a connector; A support base is located at the tail end of the transmission lead screw.

[0012] In one embodiment, the quick-freezing device airflow adjustment structure further includes at least two temperature sensors, which are disposed on the upper perforated plate and / or the housing assembly, and have a preset detection distance between them. The two temperature sensors are used to detect the temperature of the item to be frozen.

[0013] In one embodiment, the quick-freezing device airflow adjustment structure further includes a controller, which receives the temperature of the item to be frozen detected by the two temperature sensors and adjusts the included angle between the plurality of perforated plates based on the temperature of the item to be frozen, so as to adjust the airflow around the item to be frozen.

[0014] In a second aspect, embodiments of the present invention provide an impact quick-freezing device, including a quick-freezing device airflow adjustment structure as described in any embodiment of the first aspect.

[0015] Thirdly, embodiments of the present invention provide a method for adjusting the airflow of an impact-type quick-freezing device, including: Obtain the initial freezing temperature difference of the item to be frozen within a detection cycle; The included angle between the perforated plates is increased by stretching multiple perforated plates using a drive assembly. The initial freezing temperature difference of the item to be frozen within a detection cycle is obtained after adjusting the included angle between the multiple orifice plates; The driving component is controlled to adjust the included angle between the multiple perforated plates based on the initial freezing temperature difference and the initial adjustment freezing temperature difference.

[0016] In one embodiment, obtaining the initial freezing temperature difference of the item to be frozen within a detection cycle specifically involves: The initial temperature of the item to be frozen is detected by a temperature sensor located at the initial detection position. The second initial temperature of the item to be frozen is detected by a temperature sensor located at the end detection position; The initial freezing temperature difference is derived based on the first initial temperature and the second initial temperature, wherein there is a preset detection distance between the initial detection position and the final detection position.

[0017] In one embodiment, obtaining the initial freezing temperature difference of the item to be frozen within a detection cycle after adjusting the included angle between the plurality of orifice plates specifically involves: The initial temperature of the item to be frozen is detected by a temperature sensor located at the initial detection position. The second initial temperature of the item to be frozen is detected by a temperature sensor located at the end detection position; The initial freezing temperature difference is derived based on the first initial temperature and the second initial temperature, wherein there is a preset detection distance between the initial detection position and the final detection position.

[0018] In one embodiment, controlling the driving component to adjust the included angle between the plurality of perforated plates based on the initial freezing temperature difference and the initial adjustment freezing temperature difference specifically involves: If the initial freezing temperature difference is less than or equal to the initial adjustment freezing temperature difference, the driving component stretches the multiple perforated plates to increase the included angle between the multiple perforated plates. If the initial freezing temperature difference is greater than the initial adjustment freezing temperature difference, then the drive component is turned off.

[0019] In one embodiment, before stretching the plurality of perforated plates by the driving assembly to increase the included angle between the plurality of perforated plates, the method further includes: The driving component drives the multiple perforated plates to rotate relative to each other, so as to set the included angle between the multiple perforated plates as the initial included angle.

[0020] Compared with the prior art, the advantages of the embodiments of the present invention are that by setting the upper perforated plate as including multiple rotatably connected perforated plates, and providing a fixed connection point and at least one sliding connection point on the upper perforated plate, wherein the fixed connection point is fixedly connected to the housing assembly, and the sliding connection point is slidably connected to the housing assembly, the driving component can drive the upper perforated plate to stretch or compress the multiple perforated plates around the fixed connection point to adjust the included angle between the multiple perforated plates, thereby adjusting the air field around the item to be frozen. This solves the problem of existing impact quick-freezing devices being unable to adjust the air field around the item to be frozen, resulting in poor heat transfer efficiency, poor freezing effect, and long freezing time, thus improving the heat transfer efficiency and freezing effect of the impact quick-freezing device and shortening the freezing time. Attached Figure Description

[0021] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the airflow adjustment structure of a quick-freezing device according to an embodiment of the present invention; Figure 2 This is a top view of the upper perforated plate provided in another embodiment of the present invention; Figure 3 This is a front view of the upper perforated plate provided in an embodiment of the present invention; Figure 4 This is a flowchart of an impact quick-freezing device airflow adjustment method provided in an embodiment of the present invention.

[0023] Figure label: 10. Housing assembly; 110. Hanging rail; 120. Lower housing; 130. Sliding hanger rod; 140. Fixed hanger rod; 20. Conveyor belt; 30. Upper perforated plate; 310. Rotating shaft; 320. Perforated plate sheet; 3201. Air distribution hole; 40. Drive assembly; 410. Drive motor; 420. Lead screw; 430. Nut seat; 440. Support base; 450. Connecting component; 50. Lower perforated plate. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] As people's living standards improve, their pursuit of food quality also increases. Some foods require quick-freezing to extend their shelf life and facilitate longer transport distances, leading to the development of various quick-freezing devices such as impact freezers and spiral freezers. Impact freezers utilize high-speed jets of air to impact the surface of goods. This gas jet breaks up the stagnant boundary layer on the surface, increasing the heat transfer coefficient to a maximum of 300 W / (m²·K), thus accelerating the freezing rate.

[0026] When using an impact freezer, high-speed cold air blown by a cold air blower enters the static pressure chamber. Inside the static pressure chamber, the airflow velocity decreases, changing from dynamic pressure to static pressure. At the outlet of the static pressure chamber, above and / or below the conveyor belt that transports the items to be frozen, perforated plates are installed. The airflow is accelerated through the small holes on the perforated plates, generating high-speed airflow that impacts the surface of the goods for freezing. Different structures of the upper and / or lower perforated plates will create different airflow distributions in the freezing zone, resulting in different upper and lower wind speed ratios. The tilt angle of traditional straight perforated plates is not adjustable, so the wind speed ratio in the freezing zone is basically fixed. The airflow distribution after passing through the straight perforated plates and the wind field around the items to be frozen cannot be adjusted according to the type of goods to be frozen. This results in suboptimal heat transfer when using the impact freezer, making it difficult to achieve the best freezing effect for different goods, extending the freezing time, increasing energy consumption, and reducing production capacity.

[0027] Example 1 To address the aforementioned technical issues, such as Figure 1 As shown, this application embodiment provides a quick-freezing device airflow adjustment structure, including: Housing assembly 10; The conveyor belt 20, located inside the housing assembly 10, is used to transport items to be frozen; The upper perforated plate 30 is disposed above the conveyor belt 20 and has a fixed connection point and at least one sliding connection point. The fixed connection point is fixedly connected to the housing assembly 10, and the sliding connection point is slidably connected to the housing assembly 10. The upper perforated plate 30 includes a plurality of rotatably connected perforated plate pieces 320. At least one drive assembly 40 is connected to the upper perforated plate 30 and is used to stretch or compress the multiple perforated plates 320 around a fixed connection point to adjust the included angle between the multiple perforated plates 320, so as to adjust the air field around the item to be frozen.

[0028] It should be noted that the conveyor belt 20 is usually driven by a drive mechanism. The conveyor belt 20 rotates along the length of the housing assembly 10 to transport items to be frozen. The items to be frozen can be various vegetables, meats, etc. In use, the high-speed cold air blown by the cold air blower blows upward through the static pressure box and onto the perforated plate 30. The drive assembly 40 stretches or compresses multiple perforated plates 320 around the fixed connection point to adjust the included angle between the multiple perforated plates 320. Different air fields can be set for different items to be frozen to improve freezing efficiency. Usually, a uniform air field needs to be formed around each item to be frozen so that the surface of the items to be frozen can be uniformly heated in multiple directions, so that the freezing rate of the items to be frozen is consistent and the overall taste is uniform.

[0029] In some embodiments, the housing assembly 10 includes: at least one hanging rail 110, on which a fixed hanging rod 140 and a sliding hanging rod 130 are provided, the fixed hanging rod 140 being connected to a fixed connection point and the sliding hanging rod 130 being connected to a sliding connection point; and a lower housing 120, connected to the hanging rail 110, having a conveyor belt 20 inside, on which a drive assembly 40 is provided.

[0030] It should be noted that the upper end of the fixed hanger 140 is fixedly connected to the hanging rail 110, and the lower end of the fixed hanger 140 is connected to the fixed connection point of the upper perforated plate 30. Since the fixed hanger 140 is fixed on the hanging rail 110, the fixed connection point on the upper perforated plate 30 is a fixed point. The upper end of the sliding hanger 130 is slidably connected to the hanging rail 110, and the lower end of the sliding hanger 130 is connected to the sliding connection point on the upper perforated plate 30. When the multiple perforated plates 320 are stretched or compressed by the drive assembly 40, the sliding hanger 130 slides along the hanging rail 110 with the fixed hanger 140 as the center to stretch or compress the multiple perforated plates 320, so as to change the tilt angle of the perforated plates 320.

[0031] In some embodiments, at least one hanging rail 110 is a plurality of hanging rails 110, which are spaced apart along the width direction of the housing assembly 10.

[0032] It should be noted that, as Figure 2 As shown, since the upper perforated plate 30 is connected to the hanging rail 110 through the fixed hanging rod 140 and the sliding hanging rod 130, and the weight of the upper perforated plate 30 is borne by the hanging rail 110, multiple hanging rails 110 can be set in order to ensure the stability of the hanging rail 110 itself and the balance and stability of the upper perforated plate 30, such as 2 or 4. When multiple hanging rails 110 are set, the multiple hanging rails 110 can be arranged centrally symmetrically along the width direction of the housing assembly 10 or evenly distributed along the width direction of the housing assembly 10.

[0033] In some embodiments, the upper perforated plate 30 includes: a rotating shaft 310; a plurality of perforated plate pieces 320, adjacent perforated plate pieces 320 being rotatably connected by the rotating shaft 310; wherein, both fixed connection points and sliding connection points are provided on the rotating shaft 310, the fixed connection points are located at the beginning or end of the upper perforated plate 30, and the sliding connection points are located at the end away from the fixed connection points.

[0034] It should be noted that setting the fixed connection point and the sliding connection point on the perforated plate 320 would fix the position of the perforated plate 320 and prevent it from rotating. Therefore, the fixed connection point and the sliding connection point are set on the rotating shaft 310. The fixed connection point corresponds one-to-one with the fixed hanger 140, and the sliding connection point corresponds one-to-one with the sliding hanger 130. Usually, when there are multiple hanger rails 110, each hanger rail 110 is provided with a fixed hanger 140. If there are two hanger rails, the rotating shaft 310 will be provided with two fixed connection points.

[0035] It should be noted that the first end of the upper perforated plate 30 is Figure 1 The left end of the upper orifice plate 30 is the tail end of the upper orifice plate 30. Figure 1 The fixed connection point is located at the beginning of the upper perforated plate 30, which is the rotating shaft 310 located at the left end of the upper perforated plate 30. The fixed connection point is located at the end of the upper perforated plate 30, which is the rotating shaft 310 located at the right end of the upper perforated plate 30. When the fixed connection point is located on the rotating shaft 310 located at the left end of the upper perforated plate 30, the sliding connection point is usually located to the right of the fixed connection point. The drive assembly 40 is connected to the right end of the upper perforated plate 30 to stretch or compress multiple perforated plate pieces 320. When the fixed connection point is located on the rotating shaft 310 located at the right end of the upper perforated plate 30, the sliding connection point is usually located to the left of the fixed connection point. The drive assembly 40 is connected to the left end of the upper perforated plate 30 to stretch or compress multiple perforated plate pieces 320. In both of the above cases, only one drive assembly 40 is needed to stretch or compress multiple perforated plate pieces 320.

[0036] It should be noted that when the length of the upper perforated plate 30 is small, the weight of the upper perforated plate 30 is small, and the deformation of the upper perforated plate 30 is small. The sliding hanger 130 can be omitted. That is, when the fixed connection point is set on the rotating shaft 310 at the upper left end of the upper perforated plate 30, the drive assembly 40 is directly connected to the right end of the upper perforated plate 30; when the fixed connection point is set on the rotating shaft 310 at the upper right end of the upper perforated plate 30, the drive assembly 40 is directly connected to the left end of the upper perforated plate 30. This can save materials and reduce costs.

[0037] It should be noted that the perforated plate 320 is provided with air distribution holes 3201. When multiple perforated plates 320 are stretched or compressed by the drive assembly 40, the tilt angle of each perforated plate 320 is changed, that is, the tilt angle and height of the air distribution holes 3201 on the perforated plate 320 are changed. This changes the airflow distribution after passing through the upper perforated plate 30 and the wind field around the items to be frozen.

[0038] In some embodiments, the upper perforated plate 30 includes: a rotating shaft 310; a plurality of perforated plate pieces 320, adjacent perforated plate pieces 320 being rotatably connected via the rotating shaft 310; wherein, both fixed connection points and sliding connection points are disposed on the rotating shaft 310, the fixed connection point is located in the middle of the upper perforated plate 30, at least one sliding connection point is two sliding connection points, the two sliding connection points are respectively located on both sides of the fixed connection point, at least one driving assembly 40 is two driving assemblies 40, the two driving assemblies 40 are respectively connected to the first end and the last end of the upper perforated plate 30.

[0039] It should be noted that the fixed connection point is located in the middle of the upper perforated plate 30, that is, on the rotating shaft 310 located in the middle of the upper perforated plate 30. The two sliding connection points are located on both sides of the fixed connection point, that is, on the rotating shaft 310 on both sides of the fixed connection point on the upper perforated plate 30. Setting two sliding connection points can improve the stability of the upper perforated plate 30 and prevent it from shaking. When stretching or compressing multiple perforated plate pieces 320, the two drive components 40 stretch or compress from the left and right ends of the upper perforated plate 30, with the fixed connection point as the center.

[0040] It should be noted that two hanging rails 110 can be set at the front and rear ends of the upper perforated plate 30, and the two ends of the upper rotating shaft 310 on the upper part of the upper perforated plate 30 can be embedded in the hanging rails 110. At this time, the upper rotating shaft 310 on the upper part of the upper perforated plate 30 can slide in the hanging rails 110, thereby realizing the stretching and compression of the perforated plate 320 without the need to set the fixed hanging rod 140 and the sliding hanging rod 130.

[0041] In some embodiments, the quick-freezing device airflow adjustment structure further includes a lower perforated plate 50, which is located below the conveyor belt 20 and connected to the housing assembly 10.

[0042] It should be noted that the lower perforated plate 50 can be a flat perforated plate, in which case the airflow around the item to be frozen can be adjusted by adjusting the upper perforated plate 30; the lower perforated plate 50 can also have the same structure as the upper perforated plate 30, that is, it includes multiple rotatably connected perforated plate pieces 320, so that the airflow around the item to be frozen can be adjusted by the upper perforated plate 30 and the lower perforated plate 50 together.

[0043] In some embodiments, the drive assembly 40 includes: a drive motor 410; a transmission screw 420 connected to the drive motor 410; a nut seat 430 disposed on the transmission screw 420 and connected to the upper hole plate 30 via a connector 450; and a support seat 440 disposed at the tail end of the transmission screw 420.

[0044] It should be noted that the drive motor 410 is fixed on the lower housing 120, and the end of the drive motor 410 away from the lower housing 120 is connected to the transmission screw 420. By connecting the nut seat 430 on the transmission screw 420 to the connector 450 and the connector 450 to the upper hole plate 30, the rotation of the transmission screw 420 can be converted into the linear motion of the upper hole plate 30. The support seat 440 is used to limit the displacement of the nut seat 430.

[0045] In some embodiments, the quick-freezing device airflow adjustment structure further includes at least two temperature sensors, which are disposed on the upper perforated plate 30 and / or the housing assembly 10, and have a preset detection distance between them. The two temperature sensors are used to detect the temperature of the items to be frozen.

[0046] In some embodiments, the quick-freezing device airflow adjustment structure further includes a controller, which receives the temperature of the item to be frozen detected by two temperature sensors and adjusts the included angle between multiple perforated plates 320 based on the temperature of the item to be frozen, so as to adjust the airflow around the item to be frozen.

[0047] It should be noted that the temperature sensor is an infrared imaging sensor. The infrared imaging sensor projects light onto the surface of the item to be frozen to detect its temperature. Two temperature sensors are used to detect the temperature of the same item when it is transported to the two temperature sensors; that is, one temperature sensor is located at the initial detection position. Figure 1 The temperature sensor located on the left side of the middle section is used to detect the initial temperature of the item to be frozen for the first time. Another temperature sensor is located at the end detection position. Figure 1 The temperature sensor on the right side of the image is used to detect the second initial temperature of the item to be frozen. This allows the freezing effect of the item to be frozen to be determined by the first and second initial temperatures. The greater the temperature difference, the better the freezing effect.

[0048] It should be noted that the detection of the same item to be frozen by two temperature sensors can be achieved by setting the detection time. That is, after the temperature sensor at the initial detection position detects the first initial temperature of the item to be frozen, the second initial temperature of the item to be frozen is detected by the temperature sensor at the end detection position after a preset time interval. The preset detection time can be determined according to the preset detection gap, that is, preset time interval = preset detection gap / speed of conveyor belt 20.

[0049] It should be noted that a detection cycle is completed when two temperature sensors detect the same item to be frozen. The initial freezing temperature difference can be obtained by subtracting the first and second initial temperatures. However, the initial freezing temperature difference only provides the absolute value of freezing and cannot measure whether it has the optimal heat exchange efficiency. Therefore, the angle between the multiple perforated plates 320 can be adjusted by the drive motor 410 (usually by stretching to increase the angle between the perforated plates 320), i.e., the tilt angle of the perforated plates 320. Then, the first initial temperature of the item to be frozen is detected again by the temperature sensor located at the initial detection position, and the temperature of the item to be frozen is detected again by the temperature sensor located at the end detection position. The second initial adjustment temperature of the product is used to calculate the initial freezing temperature difference based on the first and second initial adjustment temperatures. If the initial freezing temperature difference is less than or equal to the initial freezing temperature difference, it means that adjusting the angle between the multiple perforated plates 320 has not improved the freezing efficiency. In this case, stop increasing the tilt angle of the perforated plates 320, or decrease the angle between the perforated plates 320 and measure again. If the initial freezing temperature difference is greater than the initial freezing temperature difference, it means that adjusting the angle between the multiple perforated plates 320 (increasing it) has improved the freezing efficiency. In this case, the angle between the perforated plates 320 can be increased further, and the measurement can be taken again. In this way, the freezing efficiency can be improved to the optimal level by adjusting the angle between the perforated plates 320.

[0050] It should be noted that the initial included angle θ between the perforated plates 320 is usually set to 45° when freezing begins each time. The freezing efficiency is usually low at this time. In this way, the freezing efficiency can be improved simply by stretching the upper perforated plate 30, without having to repeatedly stretch and compress the perforated plates 320 for adjustment.

[0051] In summary, compared with the prior art, the advantages of the embodiments of the present invention are that by setting the upper perforated plate 30 to include multiple rotatably connected perforated plate pieces 320, and providing a fixed connection point and at least one sliding connection point on the upper perforated plate 30, wherein the fixed connection point is fixedly connected to the housing assembly 10, and the sliding connection point is slidably connected to the housing assembly 10, when the upper perforated plate 30 is driven by the driving assembly 40, the multiple perforated plate pieces 320 can be stretched or compressed around the fixed connection point to adjust the included angle between the multiple perforated plate pieces 320, thereby adjusting the air field around the item to be frozen. This solves the problem of existing impact quick-freezing devices being unable to adjust the air field around the item to be frozen, resulting in poor heat transfer efficiency, poor freezing effect, and long freezing time, thereby improving the heat transfer efficiency and freezing effect of the impact quick-freezing device and shortening the freezing time.

[0052] Example 2 This application provides an impact-type quick-freezing device, including the quick-freezing device airflow adjustment structure as shown in Embodiment 1. The quick-freezing device airflow adjustment structure includes: Housing assembly 10; The conveyor belt 20, located inside the housing assembly 10, is used to transport items to be frozen; The upper perforated plate 30 is disposed above the conveyor belt 20 and has a fixed connection point and at least one sliding connection point. The fixed connection point is fixedly connected to the housing assembly 10, and the sliding connection point is slidably connected to the housing assembly 10. The upper perforated plate 30 includes a plurality of rotatably connected perforated plate pieces 320. At least one drive assembly 40 is connected to the upper perforated plate 30 and is used to stretch or compress the multiple perforated plates 320 around a fixed connection point to adjust the included angle between the multiple perforated plates 320, so as to adjust the air field around the item to be frozen.

[0053] It should be noted that the conveyor belt 20 is usually driven by a drive mechanism. The conveyor belt 20 rotates along the length of the housing assembly 10 to transport items to be frozen. The items to be frozen can be various vegetables, meats, etc. In use, the high-speed cold air blown by the cold air blower blows upward through the static pressure box and onto the perforated plate 30. The drive assembly 40 stretches or compresses multiple perforated plates 320 around the fixed connection point to adjust the included angle between the multiple perforated plates 320. Different air fields can be set for different items to be frozen to improve freezing efficiency. Usually, a uniform air field needs to be formed around each item to be frozen so that the surface of the items to be frozen can be uniformly heated in multiple directions, so that the freezing rate of the items to be frozen is consistent and the overall taste is uniform.

[0054] In some embodiments, the housing assembly 10 includes: at least one hanging rail 110, on which a fixed hanging rod 140 and a sliding hanging rod 130 are provided, the fixed hanging rod 140 being connected to a fixed connection point and the sliding hanging rod 130 being connected to a sliding connection point; and a lower housing 120, connected to the hanging rail 110, having a conveyor belt 20 inside, on which a drive assembly 40 is provided.

[0055] It should be noted that the upper end of the fixed hanger 140 is fixedly connected to the hanging rail 110, and the lower end of the fixed hanger 140 is connected to the fixed connection point of the upper perforated plate 30. Since the fixed hanger 140 is fixed on the hanging rail 110, the fixed connection point on the upper perforated plate 30 is a fixed point. The upper end of the sliding hanger 130 is slidably connected to the hanging rail 110, and the lower end of the sliding hanger 130 is connected to the sliding connection point on the upper perforated plate 30. When the multiple perforated plates 320 are stretched or compressed by the drive assembly 40, the sliding hanger 130 slides along the hanging rail 110 with the fixed hanger 140 as the center to stretch or compress the multiple perforated plates 320, so as to change the tilt angle of the perforated plates 320.

[0056] In some embodiments, at least one hanging rail 110 is a plurality of hanging rails 110, which are spaced apart along the width direction of the housing assembly 10.

[0057] It should be noted that, as Figure 2 As shown, since the upper perforated plate 30 is connected to the hanging rail 110 through the fixed hanging rod 140 and the sliding hanging rod 130, and the weight of the upper perforated plate 30 is borne by the hanging rail 110, multiple hanging rails 110 can be set in order to ensure the stability of the hanging rail 110 itself and the balance and stability of the upper perforated plate 30, such as 2 or 4. When multiple hanging rails 110 are set, the multiple hanging rails 110 can be arranged centrally symmetrically along the width direction of the housing assembly 10 or evenly distributed along the width direction of the housing assembly 10.

[0058] In some embodiments, the upper perforated plate 30 includes: a rotating shaft 310; a plurality of perforated plate pieces 320, adjacent perforated plate pieces 320 being rotatably connected by the rotating shaft 310; wherein, both fixed connection points and sliding connection points are provided on the rotating shaft 310, the fixed connection points are located at the beginning or end of the upper perforated plate 30, and the sliding connection points are located at the end away from the fixed connection points.

[0059] It should be noted that setting the fixed connection point and the sliding connection point on the perforated plate 320 would fix the position of the perforated plate 320 and prevent it from rotating. Therefore, the fixed connection point and the sliding connection point are set on the rotating shaft 310. The fixed connection point corresponds one-to-one with the fixed hanger 140, and the sliding connection point corresponds one-to-one with the sliding hanger 130. Usually, when there are multiple hanger rails 110, each hanger rail 110 is provided with a fixed hanger 140. If there are two hanger rails, the rotating shaft 310 will be provided with two fixed connection points.

[0060] It should be noted that the first end of the upper perforated plate 30 is Figure 1 The left end of the upper orifice plate 30 is the tail end of the upper orifice plate 30. Figure 1 The fixed connection point is located at the beginning of the upper perforated plate 30, which is the rotating shaft 310 located at the left end of the upper perforated plate 30. The fixed connection point is located at the end of the upper perforated plate 30, which is the rotating shaft 310 located at the right end of the upper perforated plate 30. When the fixed connection point is located on the rotating shaft 310 located at the left end of the upper perforated plate 30, the sliding connection point is usually located to the right of the fixed connection point. The drive assembly 40 is connected to the right end of the upper perforated plate 30 to stretch or compress multiple perforated plate pieces 320. When the fixed connection point is located on the rotating shaft 310 located at the right end of the upper perforated plate 30, the sliding connection point is usually located to the left of the fixed connection point. The drive assembly 40 is connected to the left end of the upper perforated plate 30 to stretch or compress multiple perforated plate pieces 320. In both of the above cases, only one drive assembly 40 is needed to stretch or compress multiple perforated plate pieces 320.

[0061] It should be noted that when the length of the upper perforated plate 30 is small, the weight of the upper perforated plate 30 is small, and the deformation of the upper perforated plate 30 is small. The sliding hanger 130 can be omitted. That is, when the fixed connection point is set on the rotating shaft 310 at the upper left end of the upper perforated plate 30, the drive assembly 40 is directly connected to the right end of the upper perforated plate 30; when the fixed connection point is set on the rotating shaft 310 at the upper right end of the upper perforated plate 30, the drive assembly 40 is directly connected to the left end of the upper perforated plate 30. This can save materials and reduce costs.

[0062] It should be noted that the perforated plate 320 is provided with air distribution holes 3201. When multiple perforated plates 320 are stretched or compressed by the drive assembly 40, the tilt angle of each perforated plate 320 is changed, that is, the tilt angle and height of the air distribution holes 3201 on the perforated plate 320 are changed. This changes the airflow distribution after passing through the upper perforated plate 30 and the wind field around the items to be frozen.

[0063] In some embodiments, the upper perforated plate 30 includes: a rotating shaft 310; a plurality of perforated plate pieces 320, adjacent perforated plate pieces 320 being rotatably connected via the rotating shaft 310; wherein, both fixed connection points and sliding connection points are disposed on the rotating shaft 310, the fixed connection point is located in the middle of the upper perforated plate 30, at least one sliding connection point is two sliding connection points, the two sliding connection points are respectively located on both sides of the fixed connection point, at least one driving assembly 40 is two driving assemblies 40, the two driving assemblies 40 are respectively connected to the first end and the last end of the upper perforated plate 30.

[0064] It should be noted that the fixed connection point is located in the middle of the upper perforated plate 30, that is, on the rotating shaft 310 located in the middle of the upper perforated plate 30. The two sliding connection points are located on both sides of the fixed connection point, that is, on the rotating shaft 310 on both sides of the fixed connection point on the upper perforated plate 30. Setting two sliding connection points can improve the stability of the upper perforated plate 30 and prevent it from shaking. When stretching or compressing multiple perforated plate pieces 320, the two drive components 40 stretch or compress from the left and right ends of the upper perforated plate 30, with the fixed connection point as the center.

[0065] It should be noted that two hanging rails 110 can be set at the front and rear ends of the upper perforated plate 30, and the two ends of the upper rotating shaft 310 on the upper part of the upper perforated plate 30 can be embedded in the hanging rails 110. At this time, the upper rotating shaft 310 on the upper part of the upper perforated plate 30 can slide in the hanging rails 110, thereby realizing the stretching and compression of the perforated plate 320 without the need to set the fixed hanging rod 140 and the sliding hanging rod 130.

[0066] In some embodiments, the quick-freezing device airflow adjustment structure further includes a lower perforated plate 50, which is located below the conveyor belt 20 and connected to the housing assembly 10.

[0067] It should be noted that the lower perforated plate 50 can be a flat perforated plate, in which case the airflow around the item to be frozen can be adjusted by adjusting the upper perforated plate 30; the lower perforated plate 50 can also have the same structure as the upper perforated plate 30, that is, it includes multiple rotatably connected perforated plate pieces 320, so that the airflow around the item to be frozen can be adjusted by the upper perforated plate 30 and the lower perforated plate 50 together.

[0068] In some embodiments, the drive assembly 40 includes: a drive motor 410; a transmission screw 420 connected to the drive motor 410; a nut seat 430 disposed on the transmission screw 420 and connected to the upper hole plate 30 via a connector 450; and a support seat 440 disposed at the tail end of the transmission screw 420.

[0069] It should be noted that the drive motor 410 is fixed on the lower housing 120, and the end of the drive motor 410 away from the lower housing 120 is connected to the transmission screw 420. By connecting the nut seat 430 on the transmission screw 420 to the connector 450 and the connector 450 to the upper hole plate 30, the rotation of the transmission screw 420 can be converted into the linear motion of the upper hole plate 30. The support seat 440 is used to limit the displacement of the nut seat 430.

[0070] In some embodiments, the quick-freezing device airflow adjustment structure further includes at least two temperature sensors, which are disposed on the upper perforated plate 30 and / or the housing assembly 10, and have a preset detection distance between them. The two temperature sensors are used to detect the temperature of the items to be frozen.

[0071] In some embodiments, the quick-freezing device airflow adjustment structure further includes a controller, which receives the temperature of the item to be frozen detected by two temperature sensors and adjusts the included angle between multiple perforated plates 320 based on the temperature of the item to be frozen, so as to adjust the airflow around the item to be frozen.

[0072] It should be noted that the temperature sensor is an infrared imaging sensor. The infrared imaging sensor projects light onto the surface of the item to be frozen to detect its temperature. Two temperature sensors are used to detect the temperature of the same item when it is transported to the two temperature sensors; that is, one temperature sensor is located at the initial detection position. Figure 1 The temperature sensor located on the left side of the middle section is used to detect the initial temperature of the item to be frozen for the first time. Another temperature sensor is located at the end detection position. Figure 1 The temperature sensor on the right side of the image is used to detect the second initial temperature of the item to be frozen. This allows the freezing effect of the item to be frozen to be determined by the first and second initial temperatures. The greater the temperature difference, the better the freezing effect.

[0073] It should be noted that the detection of the same item to be frozen by two temperature sensors can be achieved by setting the detection time. That is, after the temperature sensor at the initial detection position detects the first initial temperature of the item to be frozen, the second initial temperature of the item to be frozen is detected by the temperature sensor at the end detection position after a preset time interval. The preset detection time can be determined according to the preset detection gap, that is, preset time interval = preset detection gap / speed of conveyor belt 20.

[0074] It should be noted that a detection cycle is completed when two temperature sensors detect the same item to be frozen. The initial freezing temperature difference can be obtained by subtracting the first and second initial temperatures. However, the initial freezing temperature difference only provides the absolute value of freezing and cannot measure whether it has the optimal heat exchange efficiency. Therefore, the angle between the multiple perforated plates 320 can be adjusted by the drive motor 410 (usually by stretching to increase the angle between the perforated plates 320), i.e., the tilt angle of the perforated plates 320. Then, the first initial temperature of the item to be frozen is detected again by the temperature sensor located at the initial detection position, and the temperature of the item to be frozen is detected again by the temperature sensor located at the end detection position. The second initial adjustment temperature of the product is used to calculate the initial freezing temperature difference based on the first and second initial adjustment temperatures. If the initial freezing temperature difference is less than or equal to the initial freezing temperature difference, it means that adjusting the angle between the multiple perforated plates 320 has not improved the freezing efficiency. In this case, stop increasing the tilt angle of the perforated plates 320, or decrease the angle between the perforated plates 320 and measure again. If the initial freezing temperature difference is greater than the initial freezing temperature difference, it means that adjusting the angle between the multiple perforated plates 320 (increasing it) has improved the freezing efficiency. In this case, the angle between the perforated plates 320 can be increased further, and the measurement can be taken again. In this way, the freezing efficiency can be improved to the optimal level by adjusting the angle between the perforated plates 320.

[0075] It should be noted that the initial included angle θ between the perforated plates 320 is usually set to 45° when freezing begins each time. The freezing efficiency is usually low at this time. In this way, the freezing efficiency can be improved simply by stretching the upper perforated plate 30, without having to repeatedly stretch and compress the perforated plates 320 for adjustment.

[0076] In summary, compared with the prior art, the advantages of the embodiments of the present invention are that by setting the upper perforated plate 30 to include multiple rotatably connected perforated plate pieces 320, and providing a fixed connection point and at least one sliding connection point on the upper perforated plate 30, wherein the fixed connection point is fixedly connected to the housing assembly 10, and the sliding connection point is slidably connected to the housing assembly 10, when the upper perforated plate 30 is driven by the driving assembly 40, the multiple perforated plate pieces 320 can be stretched or compressed around the fixed connection point to adjust the included angle between the multiple perforated plate pieces 320, thereby adjusting the air field around the item to be frozen. This solves the problem of existing impact quick-freezing devices being unable to adjust the air field around the item to be frozen, resulting in poor heat transfer efficiency, poor freezing effect, and long freezing time, thereby improving the heat transfer efficiency and freezing effect of the impact quick-freezing device and shortening the freezing time.

[0077] Example 3 like Figure 4 As shown in the figure, this application provides a method for adjusting the airflow of an impact-type quick-freezing device, including: S101: Obtain the initial freezing temperature difference of the item to be frozen within a detection cycle; In some embodiments, obtaining the initial freezing temperature difference of the item to be frozen within a detection cycle specifically involves: detecting a first initial temperature of the item to be frozen using a temperature sensor located at the initial detection position; detecting a second initial temperature of the item to be frozen using a temperature sensor located at the end detection position; and deriving the initial freezing temperature difference based on the first initial temperature and the second initial temperature, wherein there is a preset detection distance between the initial detection position and the end detection position.

[0078] It should be noted that the temperature sensor is an infrared imaging sensor. The infrared imaging sensor projects light onto the surface of the item to be frozen to detect its temperature. Two temperature sensors are used to detect the temperature of the same item when it is transported to the two temperature sensors; that is, one temperature sensor is located at the initial detection position. Figure 1 The temperature sensor located on the left side of the middle section is used to detect the initial temperature of the item to be frozen for the first time. Another temperature sensor is located at the end detection position. Figure 1 The temperature sensor on the right side of the image is used to detect the second initial temperature of the item to be frozen. This allows the freezing effect of the item to be frozen to be determined by the first and second initial temperatures. The greater the temperature difference, the better the freezing effect.

[0079] It should be noted that the detection of the same item to be frozen by two temperature sensors can be achieved by setting the detection time. That is, after the temperature sensor at the initial detection position detects the first initial temperature of the item to be frozen, the temperature sensor at the end detection position detects the second initial temperature of the item to be frozen after a preset time interval. The preset detection time can be determined according to the preset detection gap, that is, preset detection time = preset detection gap / speed of conveyor belt 20.

[0080] S102: The drive assembly 40 stretches the plurality of perforated plates 320 to increase the included angle between the plurality of perforated plates 320; It should be noted that the stretching of multiple perforated plates 320 by the drive assembly 40 is specifically as follows: the drive motor 410 is fixed on the lower housing 120, and the end of the drive motor 410 away from the lower housing 120 is connected to the transmission screw 420. By connecting the nut seat 430 on the transmission screw 420 to the connector 450 and the connector 450 to the upper perforated plate 30, the rotation of the transmission screw 420 can be converted into the linear motion of the upper perforated plate 30, thereby stretching multiple perforated plates 320 to increase the included angle between the multiple perforated plates 320.

[0081] S103: Obtain the initial freezing temperature difference of the item to be frozen within a detection cycle after adjusting the included angle between the multiple perforated plates 320; In some embodiments, obtaining the initial adjustment freezing temperature difference of the item to be frozen within a detection cycle after adjusting the included angle between the plurality of perforated plates 320 specifically involves: detecting a first initial adjustment temperature of the item to be frozen using a temperature sensor located at the initial detection position; detecting a second initial adjustment temperature of the item to be frozen using a temperature sensor located at the end detection position; and obtaining the initial adjustment freezing temperature difference based on the first initial adjustment temperature and the second initial adjustment temperature, wherein there is a preset detection distance between the initial detection position and the end detection position.

[0082] S104: Control the drive assembly 40 to adjust the included angle between the plurality of perforated plates 320 according to the initial freezing temperature difference and the initial adjustment freezing temperature difference.

[0083] It should be noted that a detection cycle is completed when two temperature sensors detect the same item to be frozen. The initial freezing temperature difference can be obtained by subtracting the first and second initial temperatures. However, obtaining the initial freezing temperature difference only provides the absolute value of freezing and cannot measure whether it has the optimal heat exchange efficiency. Therefore, the angle between the multiple perforated plates 320 can be adjusted by the drive motor 410 (usually by stretching to increase the angle between the perforated plates 320), i.e., the tilt angle of the perforated plates 320. Then, the first initial temperature of the item to be frozen is detected again by the temperature sensor located at the initial detection position, and the temperature of the item to be frozen is detected again by the temperature sensor located at the end detection position. The second initial adjustment temperature is used to calculate the initial freezing temperature difference based on the first and second initial adjustment temperatures. If the initial freezing temperature difference is less than or equal to the initial freezing temperature difference, it means that adjusting the angle between the multiple perforated plates 320 has not improved the freezing efficiency. In this case, stop increasing the tilt angle of the perforated plates 320, or decrease the angle between the perforated plates 320 and measure again. If the initial freezing temperature difference is greater than the initial freezing temperature difference, it means that adjusting the angle between the multiple perforated plates 320 (increasing it) has improved the freezing efficiency. In this case, the angle between the perforated plates 320 can be increased further, and the measurement can be taken again. In this way, the freezing efficiency can be improved to the optimal level by adjusting the angle between the perforated plates 320.

[0084] In some embodiments, before stretching the plurality of perforated plates 320 by the driving component 40 to increase the included angle between the plurality of perforated plates 320, the method further includes: driving the plurality of perforated plates 320 to rotate relative to each other by the driving component 40 to set the included angle between the plurality of perforated plates 320 as an initial included angle.

[0085] It should be noted that the initial included angle θ between the perforated plates 320 is usually set to 45° when freezing begins each time. The freezing efficiency is usually low at this time. In this way, the freezing efficiency can be improved simply by stretching the upper perforated plate 30, without having to repeatedly stretch and compress the perforated plates 320 for adjustment.

[0086] In summary, this application obtains the initial freezing temperature difference of the item to be frozen within a detection cycle; stretches multiple perforated plates 320 by the drive component 40 to increase the included angle between the multiple perforated plates 320; obtains the initial freezing temperature difference of the item to be frozen within a detection cycle after adjusting the included angle between the multiple perforated plates 320; and controls the drive component 40 to adjust the included angle between the multiple perforated plates 320 based on the initial freezing temperature difference and the initial freezing temperature difference. This enables automatic adjustment of the included angle between the perforated plates 320, optimizes the heat transfer rate, improves the temperature uniformity of the freezing zone, ensures consistent overall freezing quality, and maximizes the freezing effect of the quick-freezing machine.

[0087] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wind field adjustment structure for a quick-freezing device, characterized in that, include: Housing assembly; A conveyor belt, located within the housing assembly, is used to transport items to be frozen; An upper perforated plate, disposed above the conveyor belt, has a fixed connection point and at least one sliding connection point. The fixed connection point is fixedly connected to the housing assembly, and the sliding connection point is slidably connected to the housing assembly. The upper perforated plate includes a plurality of rotatably connected perforated plate pieces. At least one drive component is connected to the upper perforated plate and is used to stretch or compress the multiple perforated plates around the fixed connection point to adjust the included angle between the multiple perforated plates, so as to adjust the air field around the item to be frozen; The housing assembly includes: At least one suspension rail is provided with a fixed suspension rod and a sliding suspension rod, wherein the fixed suspension rod is connected to the fixed connection point and the sliding suspension rod is connected to the sliding connection point; The lower housing is connected to the hanging rail, and the conveyor belt is installed inside it, with the drive assembly mounted on it; The driving component includes: Drive motor; The transmission lead screw is connected to the drive motor; A nut seat is provided on the transmission lead screw and is connected to the upper hole plate through a connector; A support base is located at the tail end of the transmission lead screw.

2. The quick-freezing device airflow adjustment structure according to claim 1, characterized in that, The at least one hanging rail is a plurality of hanging rails, which are spaced apart along the width direction of the housing assembly.

3. The quick-freezing device airflow adjustment structure according to claim 1, characterized in that, The upper perforated plate includes: Shaft; The plurality of perforated plates are rotatably connected to adjacent perforated plates via the rotating shaft; Both the fixed connection point and the sliding connection point are located on the rotating shaft. The fixed connection point is located at the beginning or end of the upper perforated plate, and the sliding connection point is located at the end away from the fixed connection point.

4. The quick-freezing device airflow adjustment structure according to claim 1, characterized in that, The upper perforated plate includes: Shaft; The plurality of perforated plates are rotatably connected to adjacent perforated plates via the rotating shaft; The fixed connection point and the sliding connection point are both located on the rotating shaft. The fixed connection point is located in the middle of the upper hole plate. The at least one sliding connection point is two sliding connection points, which are located on both sides of the fixed connection point. The at least one driving component is two driving components, which are connected to the first end and the last end of the upper hole plate, respectively.

5. The airflow regulation structure for the quick-freezing device according to claim 1, characterized in that, The quick-freezing device's airflow adjustment structure also includes a lower perforated plate, which is located below the conveyor belt and connected to the housing assembly.

6. The airflow adjustment structure for the quick-freezing device according to any one of claims 1-5, characterized in that, The quick-freezing device airflow adjustment structure also includes at least two temperature sensors, which are disposed on the upper perforated plate and / or the housing assembly, and have a preset detection distance between them. The two temperature sensors are used to detect the temperature of the item to be frozen.

7. The quick-freezing device airflow adjustment structure according to claim 6, characterized in that, The quick-freezing device's airflow adjustment structure also includes a controller, which receives the temperature of the item to be frozen detected by the two temperature sensors and adjusts the included angle between the multiple perforated plates based on the temperature of the item to be frozen, thereby adjusting the airflow around the item to be frozen.

8. An impact-type quick-freezing device, characterized in that, Includes the wind field adjustment structure of the quick-freezing device as described in any one of claims 1-7.

9. A method for adjusting the airflow of an impact-type quick-freezing device, using the impact-type quick-freezing device as described in claim 8, characterized in that... include: Obtain the initial freezing temperature difference of the item to be frozen within a detection cycle; The included angle between the perforated plates is increased by stretching multiple perforated plates using a drive assembly. The initial freezing temperature difference of the item to be frozen within a detection cycle is obtained after adjusting the included angle between the multiple orifice plates; The driving component is controlled to adjust the included angle between the multiple perforated plates based on the initial freezing temperature difference and the initial adjustment freezing temperature difference.

10. The airflow regulation method for the impact-type quick-freezing device according to claim 9, characterized in that, The specific steps for obtaining the initial freezing temperature difference of the item to be frozen within a detection cycle are as follows: The initial temperature of the item to be frozen is detected by a temperature sensor located at the initial detection position. The second initial temperature of the item to be frozen is detected by a temperature sensor located at the end detection position; The initial freezing temperature difference is derived based on the first initial temperature and the second initial temperature, wherein there is a preset detection distance between the initial detection position and the final detection position.

11. The airflow regulation method for the impact-type quick-freezing device according to claim 9, characterized in that, The initial freezing temperature difference of the item to be frozen within a detection cycle after adjusting the included angle between the multiple perforated plates is specifically as follows: The initial temperature of the item to be frozen is detected by a temperature sensor located at the initial detection position. The second initial temperature of the item to be frozen is detected by a temperature sensor located at the end detection position; The initial freezing temperature difference is derived based on the first initial temperature and the second initial temperature, wherein there is a preset detection distance between the initial detection position and the final detection position.

12. The airflow regulation method for the impact-type quick-freezing device according to claim 9, characterized in that, The step of controlling the driving component to adjust the included angle between the multiple perforated plates based on the initial freezing temperature difference and the initial adjustment freezing temperature difference specifically involves: If the initial freezing temperature difference is less than or equal to the initial adjustment freezing temperature difference, the driving component stretches the multiple perforated plates to increase the included angle between the multiple perforated plates. If the initial freezing temperature difference is greater than the initial adjustment freezing temperature difference, then the drive component is turned off.

13. The airflow regulation method for the impact-type quick-freezing device according to any one of claims 9-12, characterized in that, Before stretching the plurality of perforated plates by the driving component to increase the included angle between the plurality of perforated plates, the method further includes: The driving component drives the multiple perforated plates to rotate relative to each other, so as to set the included angle between the multiple perforated plates as the initial included angle.

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