Winnowing device and winnowing equipment

Abstract

The utility model provides a winnowing device and winnowing equipment. The winnowing device comprises a winnowing body, a control assembly and a detection assembly. The control assembly is arranged on the winnowing body and used for controlling an air door of the winnowing body. The detection assembly is arranged on the winnowing main body and is used for detecting the negative pressure of the winnowing device in real time; and the winnowing main body, the control assembly and the detection assembly are in communication connection. According to the winnowing device, the control assembly and the detection assembly are arranged on the winnowing main body, so that the winnowing device automatically adjusts the opening degree of the air door and the winnowing negative pressure under the control of the control assembly, and the tobacco shred product quality is improved; by designing the circular-to-square connecting piece, the air door shaft and the pneumatic head are accurately connected, seamless butt joint of the positioner, the pneumatic head and the air door is achieved, the compatibility of the winnowing device is improved, and the smoothness and precision of the operation process are further ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of tobacco shred production, and in particular, relates to an air selection device and air selection equipment. Background Art

[0002] At present, the air volume control of the leaf shred air separator is to fix the door opening according to the process requirements, and manually rotate the screw to adjust the air door size. There is no quantitative state detection method and automatic control. During the production process, the changes in the state of the front-stage dust removal equipment and pipelines cannot be known in the first time. At the same time, the air door size cannot be adjusted in time with the change of material flow, and intervention measures cannot be taken. This will affect the quality of tobacco products. Summary of the invention

[0003] The purpose of the present application is to provide a wind selection device and a wind selection equipment, which are used to solve the problem that the existing wind selection equipment cannot automatically adjust the air door opening and the wind selection negative pressure, thereby affecting the quality of tobacco products.

[0004] In the first aspect, the present application provides a wind selection device, which includes: a wind selection body, a control component and a detection component; the control component is arranged on the wind selection body, and is used to control the damper of the wind selection body; the control component includes a positioner, a pneumatic actuator and a connecting piece; the positioner is connected to the pneumatic actuator; the pneumatic actuator is connected to the damper of the wind selection body through the connecting piece; the detection component is arranged on the wind selection body, and is used to detect the negative pressure of the wind selection device.

[0005] In an implementation manner of the first aspect, the connecting member includes a first connecting portion and a second connecting portion.

[0006] In an implementation of the first aspect, the first connecting part is matched and connected to the pneumatic actuator, and the first connecting part is a square structure; the second connecting part is matched and connected to the damper of the air selection body, and the second connecting part is a circular structure.

[0007] In an implementation of the first aspect, the first connecting part is matched and connected to the damper of the air selection body, and the first connecting part is a circular structure; the second connecting part is matched and connected to the pneumatic actuator, and the second connecting part is a square structure.

[0008] In an implementation of the first aspect, the detection component includes a detection head; the detection head is an L-shaped structure.

[0009] In an implementation of the first aspect, the air selection body includes a box, a rolling net mechanism and a bracket; the rolling net mechanism is located on the box; the bracket is used to support the box; and the air gate is located outside the rolling net mechanism.

[0010] In an implementation of the first aspect, the control component is disposed on the damper; and the detection head is disposed on a side of the box body close to the rolling net mechanism.

[0011] In an implementation of the first aspect, the air selection device also includes a differential pressure transmitter; the differential pressure transmitter is disposed on the bracket.

[0012] In an implementation of the first aspect, the air selection device also includes a display; the display is disposed on the bracket.

[0013] In a second aspect, the present application provides a wind selection device, which includes the wind selection device described above.

[0014] As described above, the wind selection device and wind selection equipment described in the present application have the following beneficial effects:

[0015] 1. In the present application, a control component and a detection component are arranged on the air selection body, so that the air selection device automatically adjusts the air door opening and the air selection negative pressure under the control of the control component, thereby improving the quality of tobacco products.

[0016] 2. This application designs a circular to square connector to accurately connect the damper shaft and the pneumatic head, thereby achieving seamless connection between the positioner, the pneumatic head and the damper, improving the compatibility of the air selection device, and ensuring the smoothness and accuracy of the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the structure of the air selection device described in an embodiment of the present application.

[0018] Figure 2A Shown is a schematic diagram of the control component structure described in an embodiment of the present application.

[0019] Figure 2B Shown is a schematic diagram of the control component structure described in another embodiment of the present application.

[0020] Figure 2C Display as Figure 2B Schematic diagram of the AA section in.

[0021] Figure 3A Shown is a schematic diagram of the connecting member structure described in an embodiment of the present application.

[0022] Figure 3B Shown is a schematic diagram of a connecting member structure described in another embodiment of the present application.

[0023] Figure 3C Display as Figure 3B Schematic diagram of the BB cross section.

[0024] Figure 4Shown is a schematic diagram of the structure of a wind selection device described in another embodiment of the present application.

[0025] Figure 5 Shown is a schematic diagram of the closed-loop structure of the negative pressure closed-loop automatic control system described in an embodiment of the present application.

[0026] Figure 6 Shown is a schematic diagram of the structure of the air separation equipment described in an embodiment of the present application.

[0027] Component number description

[0028] 1. Air separation device

[0029] 11 Control components

[0030] 111 Locator

[0031] 112 Pneumatic Actuator

[0032] 113 Connectors

[0033] 1131 First connection

[0034] 1132 Second connection

[0035] 12 Detection Components

[0036] 121 Detection head

[0037] 13 Winnowing Subject

[0038] 131 Air Gate

[0039] 132 Cabinet

[0040] 133 Roller Mesh Mechanism

[0041] 134 Bracket

[0042] 14 Differential pressure transmitter

[0043] 15 Display DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0046] The following embodiments of the present application provide a wind selection device and a wind selection equipment, which solves the problem that the existing wind selection equipment cannot automatically adjust the air door opening and the wind selection negative pressure, thereby affecting the quality of tobacco products.

[0047] This application is a new type of refined and intelligent control system for silk wind selection, formed by the modification of software and hardware, adopting PLC modular program structure, mutual alarm of human-machine interface, and integrating automatic control alarm prompts.

[0048] This application establishes a negative pressure closed-loop control system monitoring and alarm at the leaf silk air separator, which can save the equipment process data in real time. The historical data of air separation negative pressure and air separation opening can be traced, filling the gap in the state monitoring of air separation equipment, improving the production process state control and state perception of the air separator, and ensuring the controllable process of the removal of foreign matter such as stems and wet clumps. A monitoring and evaluation system for automatic detection of the dust collector and pipeline status is established, which can provide real-time graded alarms. It provides support for quality assurance and capacity improvement of tobacco silk production. This system is the first of its kind and is stably integrated into the silk production automatic control system, which has promotion significance in the industry.

[0049] The following will describe in detail the principles and implementation methods of a wind selection device and a wind selection equipment of this embodiment in conjunction with the accompanying drawings, so that those skilled in the art can understand the wind selection device and the wind selection equipment of this embodiment without creative work.

[0050] like Figure 1 As shown, this embodiment provides a wind selection device, and the wind selection device 1 includes: a control component 11, a detection component 12 and a wind selection body 13; the control component 11 is arranged on the wind selection body 13, and is used to control the air door 131 of the wind selection body 13; the detection component 12 is arranged on the wind selection body 13, and is used to detect the negative pressure of the wind selection device 1 in real time; the control component 11, the detection component 12 and the wind selection body 13 are communicatively connected.

[0051] Specifically, the present application performs an automated digital upgrade on the silk-making air-selecting machine, by setting hardware such as a control component 11 and a detection component 12 on the air-selecting device, and using a PLC modular program structure to construct a negative pressure closed-loop control system for the control component 11, the detection component 12, and the air-selecting body, which can automatically adjust the air door opening and the air-selecting negative pressure during the production process, improve the quality of tobacco products, and save the equipment process data in real time. The historical data of the air-selecting negative pressure and the air-selecting opening are traceable, which fills the gap in the state monitoring of the air-selecting equipment, improves the state control and state perception of the production process of the air-selecting machine, ensures that the ability to remove foreign objects such as stems and wet balls is controllable, and can also achieve real-time graded alarms. The present application is mainly based on the construction of a PLC modular program structure, a human-machine interface alarm prompt, and incorporates an automated error prevention function.

[0052] like Figure 2A As shown, in one embodiment of the present application, the control assembly 11 includes a positioner 111, a pneumatic actuator 112 and a connector 113; the positioner 111 is connected to the pneumatic actuator 112; the pneumatic actuator 112 is connected to the damper 131 of the air selection body 13 through the connector 113. Figure 2B As shown, it is shown as Figure 2A The front view of Figure 2C As shown, it is shown as Figure 2B Schematic diagram of the AA section.

[0053] Specifically, the positioner 111 is a 4 to 20 mA SAMSON 3730-3 digital valve positioner, and the pneumatic actuator 112 is a NOBOR pneumatic head 25-RDA40-1SD1E0-E and a Siemens analog input and output card, which constitute the hardware for negative pressure execution detection and control.

[0054] Since the pneumatic head adopts a square interface, the original cylindrical shaft cannot be directly connected to it. In order to solve this problem, the present application designs and manufactures a unique connector, which is a round to square connector. The present application accurately connects the damper shaft and the pneumatic head by adding an innovative round to square connector to the original cylindrical shaft, thereby achieving seamless connection between the positioner, the pneumatic head and the damper. This design not only improves the compatibility of the device, but also ensures the smoothness and precision of the operation process. The connector is the connector 113.

[0055] like Figure 3AAs shown, in one embodiment of the present application, the connecting member 113 includes a first connecting portion 1131 and a second connecting portion 1132; the first connecting portion 1131 is matched and connected to the pneumatic actuator 112, and the first connecting portion 1131 is a square structure; the second connecting portion 1132 is matched and connected to the damper 131 of the air selection body 13, and the second connecting portion 1132 is a circular structure.

[0056] To facilitate understanding of the structure of the connector 113, the present application provides several schematic diagrams of different planes of the connector 113. Figure 3B As shown, it is a front view schematic diagram of the connecting member described in the embodiment of the present application. Figure 3C As shown, it is shown as Figure 3B AA cross-section diagram shown.

[0057] Specifically, one end of the connecting piece 113 is designed as a circular structure, and the other end is designed as a square structure, which can achieve seamless connection between the positioner, the pneumatic head and the damper, while also improving the compatibility of the device and ensuring the smoothness and accuracy of the operation process.

[0058] In another embodiment of the present application, the first connecting part is matched and connected with the damper of the air selection body, and the first connecting part is a circular structure; the second connecting part is matched and connected with the pneumatic actuator, and the second connecting part is a square structure.

[0059] like Figure 4 As shown, the detection component 12 includes a detection head 121; the detection head 121 is an L-shaped structure.

[0060] Specifically, the detection component is used to detect the negative pressure of the air selection device, and the detection head is designed as an L-shaped structure to effectively prevent tobacco clogging.

[0061] like Figure 4 As shown, the air selection body 13 includes a box body 132 , a rolling net mechanism 133 and a bracket 134 ; the rolling net mechanism 133 is located above the box body 132 ; the bracket 134 is used to support the box body 132 ; and the damper 131 is located outside the rolling net mechanism 133 .

[0062] In an embodiment of the present application, the control component 11 is disposed on the damper 131 ; the detection head 121 is disposed on a side of the box 132 close to the rolling net mechanism 133 .

[0063] like Figure 4 As shown, in one embodiment of the present application, the air selection device 1 further includes a differential pressure transmitter 14 ; the differential pressure transmitter 14 is disposed on the bracket 134 .

[0064] Specifically, the differential pressure transmitter 14 is used to detect the negative pressure value of the air separation device in real time and compare it with the set target value. By detecting that the negative pressure of the air separation machine is about 1.0 mbar during normal production. At the same time, by manually adjusting the damper opening during non-production, it is confirmed that the negative pressure is in direct proportion to the damper opening. At the same time, according to the positive proportional relationship between the negative pressure and the damper opening and the diameter of the air duct, the differential pressure transmitter 14 adopts the E+H differential pressure transmitter PMD75 with a range of -10 to +10 mbar.

[0065] The basic principle of the differential pressure transmitter is: a space is divided into two chambers by a sensitive element (multi-purpose diaphragm box). When pressure is introduced into the two chambers respectively, the sensor produces displacement (or displacement tendency) under the combined action of the two pressures. The displacement is proportional to the pressure difference (differential pressure) between the two chambers. The displacement is converted into a standard signal output that can reflect the size of the differential pressure.

[0066] like Figure 4 As shown, in one embodiment of the present application, the air selection device 1 further includes a display 15 ; the display 15 is disposed on the bracket 134 .

[0067] Specifically, the display is used to display relevant data of the air selection device.

[0068] This application carries out an automated digital upgrade of the silk-making air-selecting machine, by setting hardware such as a control component 11 and a detection component 12 on the air-selecting device, and using a PLC modular program structure for the control component 11, the detection component 12 and the air-selecting body to build a negative pressure closed-loop control system, which can automatically adjust the air door opening and the air-selecting negative pressure during the production process, improve the quality of tobacco products, and can save the equipment process data in real time. The historical data of the air-selecting negative pressure and the air-selecting opening can be traced, filling the gap in the state monitoring of the air-selecting equipment, improving the state control and state perception of the production process of the air-selecting machine, ensuring the controllable process of the removal of foreign objects such as stems and wet balls, and at the same time can also achieve real-time graded alarms. This application is mainly based on the construction of a PLC modular program structure, a human-machine interface alarm prompt, and incorporates an automated error prevention function.

[0069] Specifically, the negative pressure closed-loop control system in the present application adjusts the opening angle of the damper through the control component to control the air volume. The negative pressure closed-loop automatic control system includes the following functional modules:

[0070] 1. Negative pressure detection module: used to detect the negative pressure value of the air separator in real time and compare it with the set target value. The negative pressure of the air separator is about 1.0mbar during normal production. At the same time, we manually adjust the air door opening when not in production to confirm that the negative pressure is proportional to the air door opening. At the same time, based on this data and the diameter of the air duct, we purchased and selected the E+H differential pressure transmitter PMD75 with a range of -10 to +10mbar.

[0071] 2. Damper control module: used to automatically adjust the opening angle of the damper according to the feedback signal of the negative pressure detection module to keep the negative pressure value within the target range. The 4 to 20 mA SAMSON 3730-3 digital valve positioner and NOBOR pneumatic head 25-RDA40-1SD1E0-E, Siemens analog input and output card, constitute the hardware for negative pressure execution detection and control.

[0072] 3. Data storage module: used to record the operating data of the air separator, including negative pressure value, air door opening, tobacco flow rate, etc., to facilitate later analysis and tracing.

[0073] The negative pressure closed-loop control system in the present application optimizes the control parameters of the wind selection of selected tobacco and tobacco leaves according to the tobacco flow requirements, determines the control parameters, and establishes a control system.

[0074] Optimize control parameters: Adopt the principle of wind flotation. Due to the difference in suspension speed between tobacco and other debris, under the action of vertical airflow, tobacco will rise with the airflow, while debris will fall under the action of gravity. In order to separate tobacco from debris, a vertical wind field must be created. Because the difference in suspension speed between tobacco and some debris is not very large, the wind field needs sufficient separation space. Under the dual action of wind field and gravity, the separation of tobacco raw materials and debris is achieved. The mean value of tobacco flow rate requirement is 2678kg / h, and the standard deviation is 127kg / h. The method of optimizing the control parameters of selected tobacco and tobacco leaf air selection according to the requirements of tobacco flow rate is: the car stopper obtains the control parameters according to the process parameters issued by the workshop. These process parameters are obtained from the separation experiment, and the purpose is to enable the air selector to effectively remove foreign matter such as stems and wet balls without losing tobacco. The requirement for negative pressure in the general process parameters is that the air selection negative pressure (mbar) is set to 1.15mbar for dual-channel and 1.0mbar for single-channel. Through the negative pressure closed-loop control system, the air door angle is automatically adjusted according to the negative pressure setting value and real-time detection value, so that the negative pressure of the air separator is maintained within the set range to adapt to changes in tobacco flow rate.

[0075] Determine control parameters: The operator inputs control parameters such as negative pressure setting value and alarm threshold through the human-machine interface. This negative pressure setting value can ensure the smooth separation of tobacco and foreign matter. Among them:

[0076] 1. Negative pressure set value: In PID control, the difference between the set value and the actual measured value, that is, the error e(t) = set value - actual value, will be used as the input of the control algorithm. Through the PID control negative pressure closed loop control system in the PLC program. The program will automatically calculate the valve opening according to the set value, thereby achieving accurate control of the negative pressure. By inputting reasonable pressure control input parameters, the effective operation of the air separator is ensured, while avoiding the loss of tobacco.

[0077] 2. Alarm threshold: This is a preset empirical value control parameter limit. If the actual measured value exceeds this limit, the system will trigger an alarm. If the negative pressure is too high or too low, it may affect production, so a safety range needs to be set (as shown in Table 1 below). If it exceeds this range, the system will warn the operator.

[0078]

[0079] Table 1

[0080] Control system structure: The negative pressure closed-loop automatic control system of the air separator has a closed-loop structure (such as Figure 5 The pressure difference in the air separator is measured by a pressure difference sensor, and compared with the pressure difference set by the operator. If they are consistent, the damper opening is maintained. If they are inconsistent, the PLC controls the pneumatic actuator to adjust the damper opening. The damper opening has a linear relationship with the wind pressure. As the damper opening changes, the wind pressure continues to approach the target value until it reaches the target value, completing the closed loop.

[0081] Based on the negative pressure closed-loop automatic control system, this application also establishes an alarm detection and evaluation system for the status of the air separator, so as to improve the perception ability of the operating status of the air separator equipment.

[0082] The negative pressure closed-loop automatic control system and the alarm detection and evaluation system work in a collaborative relationship. The negative pressure closed-loop automatic control system is responsible for adjusting the damper angle according to the set negative pressure value, which is determined by the separation of tobacco leaves and foreign matter. The alarm detection and evaluation system is responsible for monitoring and displaying the actual negative pressure value and damper angle, and comparing them with the set value. If there is any failure or abnormality in the negative pressure closed-loop automatic control system, it will alert the operator and suggest corrective measures.

[0083] The process of establishing the alarm detection and evaluation system of the air separator state is as follows: establish real-time monitoring of the opening angle of the air door and the pressure difference of the controlled quantity, and set low alarm, low-low alarm, high alarm, and high-high alarm. The air door alarm parameter settings: low-low 68.0% opening, low 69.0% opening, high 75.0% opening, high-high 76.0% opening; negative pressure alarm parameter settings: low-low 0.9mbar, low 1.0mbar, high 1.2mbar, high-high 1.3mbar.

[0084] This application can save the process data of negative pressure and damper angle, and the historical data can be traced and analyzed. The process data of negative pressure and damper angle is saved in the Proficy Historian database. Through the communication method of SI7, it is associated with IFIX software. IFIX software is an HMI / SCADA software that can help users display and control factory equipment and processes on a graphical interface.

[0085] This application can establish a negative pressure test before starting, and the machine can only start when the conditions are met to prevent errors. The wind pressure of the air separator is added to the start-up conditions of the tobacco drying machine to be greater than 1.0mbar, to prevent the air separator from not meeting the conditions when the tobacco drying machine is turned on cold, causing the assembly line to stop. Through the above measures, we can find the status of the air separator at the first time to ensure the quality of tobacco. At the same time, the data is recorded in the Historian database to ensure that the equipment status can be traced later.

[0086] In summary, the air separation device and air separation equipment provided by this application have the following technical effects:

[0087] 1. After establishing the negative pressure closed-loop automatic control system of the air separator equipment, the process data of negative pressure and air door angle are saved, and the historical data of air separation negative pressure and air separation opening can be traced. The relevant data relationship between air door opening and negative pressure is collected (such as Table 2 Negative pressure and air door angle process data table), and their relationship values ​​are established (such as Table 3, relationship values ​​between air door opening and negative pressure).

[0088]

[0089] Table 2. Negative pressure and damper angle process data table

[0090] Air door opening (%) Negative pressure (mbar) 0 0 25 0.098 50 0.662 75 1.46 100 1.65

[0091] Table 3. Relationship between air door opening and negative pressure

[0092] 2. After the establishment of the closed-loop automatic control system for the negative pressure of the air separator, the average negative pressure of the air separator on the production line was maintained at 1.15 mbar, and the standard deviation was 0.0006 (as shown in Table 4). The closed-loop automatic control system has a good operating effect and ensures the stability of production.

[0093] Production Line Data collection point Mean Standard Deviation Number of batches 81# Leaf Wire Negative pressure detection of leaf filament air separation 1.15 0.0006 273

[0094] Table 4. Negative pressure control effect

[0095] 3. Establish an alarm detection and evaluation system for the status of the wind separator to improve the perception of the operating status of the wind separator. When the air door opening is not between 69 and 75, and the negative pressure is not between 1.0 and 1.2, the system will issue an alarm to remind the operator (such as

[0096] Table 5, alarm display table).

[0097] start date Start time node describe value Priority area Tag Name 2022-7-5 13：00：48 ZHSCADA 1# Drying wire wind selection negative pressure 1.149 High A_Z1B Z1B_SM1243_FUYA

[0098] Table 5. Alarm display table

[0099] 4. Establish negative pressure detection before starting, and the machine can only start when the condition of 0.95mbar is met. This function successfully prevented production downtime caused by equipment failure and ensured the quality of tobacco.

[0100] like Figure 6 As shown, an embodiment of the present application provides a wind selection device, and the wind selection device 2 includes the wind selection device 1 described above.

[0101] The air separation device and air separation equipment provided by this application have been used in the leaf shred air separation machines of two production lines. By establishing a negative pressure closed-loop control system and an alarm detection and evaluation system, the control parameters of the air separation of selected tobacco and tobacco leaves are optimized according to the requirements of tobacco flow rate, and the equipment process data can be saved in real time. The historical data of air separation negative pressure and air separation opening can be traced, which fills the gap in the state monitoring of air separation equipment, improves the state control and state perception of the production process of the air separation machine, and ensures that the removal process of foreign objects such as stems and wet lumps can be controlled. By establishing an alarm detection and evaluation system, it is possible to automatically detect the monitoring and evaluation of the dust collector and pipeline status, and can achieve real-time graded alarms, establish negative pressure detection before starting, and start the car only when the conditions are met to prevent errors. This application is deployed on the production line of the silk making workshop for use, and has received good control effects and feedback.

[0102] The descriptions of the processes or structures corresponding to the above-mentioned figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0103] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A wind selection device, characterized in that: The wind selection device comprises: a wind selection body, a control component and a detection component; The control assembly is arranged on the air selection body and is used to control the damper of the air selection body; the control assembly includes a positioner, a pneumatic actuator and a connecting piece; the positioner is connected to the pneumatic actuator; the pneumatic actuator is connected to the damper of the air selection body through the connecting piece; The detection component is arranged on the air selection body and is used to detect the negative pressure of the air selection device.

2. The air separation device according to claim 1, characterized in that: The connecting member includes a first connecting portion and a second connecting portion.

3. The air separation device according to claim 2, characterized in that: The first connection part is matched and connected with the pneumatic actuator, and the first connection part is a square structure; the second connection part is matched and connected with the damper of the air selection body, and the second connection part is a circular structure.

4. The air separation device according to claim 2, characterized in that: The first connection part is matched and connected with the damper of the air selection body, and the first connection part is a circular structure; the second connection part is matched and connected with the pneumatic actuator, and the second connection part is a square structure.

5. The wind selection device according to claim 1, characterized in that: The detection component includes a detection head; the detection head is an L-shaped structure.

6. The wind selection device according to claim 5, characterized in that: The air selection body comprises a box body, a rolling net mechanism and a bracket; the rolling net mechanism is located on the box body; the bracket is used to support the box body; the air door is located outside the rolling net mechanism.

7. The wind selection device according to claim 6, characterized in that: The control component is arranged on the damper; the detection head is arranged on a side of the box body close to the rolling net mechanism.

8. The wind selection device according to claim 6, characterized in that: The air selection device also includes a differential pressure transmitter; the differential pressure transmitter is arranged on the bracket.

9. The wind selection device according to claim 6, characterized in that: The wind selection device also includes a display; the display is arranged on the bracket.

10. A wind selection device, characterized in that: The air separation equipment comprises the air separation device as described in any one of claims 1 to 9.

Images