Portable facility agriculture fan air volume automatic measuring device

Abstract

The invention relates to the technical field of fan air volume measurement, in particular to a portable facility agriculture fan air volume automatic measuring device which comprises a fan ventilation opening formed in a wall and further comprises an aluminum alloy frame, a driving mechanism and a measuring frame. The measuring frame is installed on a sliding block of the driving mechanism, a plurality of measuring assemblies are vertically arranged on the measuring frame, an aluminum alloy frame structure is adopted, the stability of the overall structure is guaranteed, meanwhile, the weight of the device is reduced, the device can be disassembled and folded when not used, carrying and carrying are convenient, and rapid transfer between different draught fans and different agricultural facilities is achieved; and the aluminum alloy frame is matched with the supporting mechanism, and through cooperation of a movable handle and a swing rod, mounting and dismounting of fan ventilation openings of different sizes can be completed in a short time, so that the testing efficiency is greatly improved, a fixing structure does not need to be customized for a specific fan, and the problem that a traditional measuring device is poor in field environment adaptability is solved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine air volume measurement technology, specifically to a portable automatic wind volume measurement device for facility agriculture wind turbines. Background Technology

[0002] In facility agriculture, including enclosed or semi-enclosed agricultural production environments such as greenhouses and livestock sheds, fans are core equipment for regulating indoor air circulation, temperature and humidity balance, and the emission of harmful gases. Air volume, a key indicator of fan operating efficiency, refers to the volume of air passing through the fan vents per unit time. Its measurement accuracy directly affects the precise control of the agricultural production environment. For example, livestock sheds require fans for ventilation and temperature control, while greenhouses need fans to regulate and maintain the carbon dioxide concentration required for crop photosynthesis. Therefore, accurate and efficient measurement of fan air volume is a fundamental technical aspect of facility agriculture environmental management.

[0003] Currently, the measurement of fan air volume in the field of facility agriculture mainly relies on two types of technical solutions: Handheld anemometer measurement method: This is the most common method used in agricultural production sites. The operator holds a portable anemometer and manually selects several points at the ventilation opening of the fan to measure the wind speed. Then, the total air volume is estimated based on the area of ​​the ventilation opening. Fixed wind tunnel measurement method: This is mainly used for fan performance calibration in laboratories or large agricultural parks. A wind tunnel is a large fixed device that simulates an airflow environment. By connecting the fan to the wind tunnel duct, the wind speed is measured using sensors evenly distributed inside the duct. The air volume is then calculated based on the cross-sectional area of ​​the duct.

[0004] However, existing technologies, such as fixed wind tunnel devices, are limited by size and weight, making them completely unsuitable for the mobile needs of facility agriculture sites. While handheld anemometers are portable, they require manual operation throughout the process, which is extremely labor-intensive for operators in large-area parks with multiple fans. Furthermore, handheld anemometers rely on manual point selection, are heavily influenced by the operator's experience, and cannot cover the entire cross-section of the ventilation openings, resulting in high errors in airflow calculation. Therefore, there is an urgent need for a portable, accurate, and easy-to-operate airflow measurement device to achieve automatic measurement and real-time monitoring of fan airflow. Summary of the Invention

[0005] To address the shortcomings and problems of cumbersome handheld measurement operations, low accuracy, and bulky and inconvenient fixed devices, this invention provides a portable automatic air volume measurement device for facility agriculture fans. This device can achieve real-time automatic air volume measurement and can be conveniently used in different locations, thus overcoming the deficiencies of the existing technology.

[0006] The solution adopted by this invention to solve its technical problem is: a portable automatic air volume measuring device for facility agriculture fans, including a fan vent installed on the wall, an aluminum alloy frame, a drive mechanism, and a measuring frame. The aluminum alloy frame is a square frame structure formed by connecting four side frames end to end. The aluminum alloy frame supports the measuring device at the fan vent. The drive mechanism is set on the aluminum alloy frame, and the measuring frame is mounted on the slider of the drive mechanism. Multiple measuring components are arranged vertically on the measuring frame. The measuring components are wind speed sensors. The drive mechanism drives the measuring frame to move left and right in front of the fan vent, so that the measuring range of the measuring components covers the entire fan vent.

[0007] Furthermore, a support mechanism is provided on the aluminum alloy frame to support the aluminum alloy frame at the fan vent. The support mechanism includes a movable handle, which is a quadrilateral linkage structure installed on the upper frame of the aluminum alloy frame. An elastic pull member is connected between the movable handle and the aluminum alloy frame to achieve pull positioning of the movable handle. Slots are evenly distributed on each frame of the aluminum alloy frame. A swing rod is rotatably fitted in the slot through a pin. The inner end of the swing rod faces the fan vent, and the outer end has a traction hole. A pull rope is movably threaded in the traction hole. The pull rope connects multiple swing rods in series, and the two ends of the pull rope are respectively connected to the two sides of the movable handle. A stop is fixedly provided on the pull rope near each swing rod. When the movable handle swings left and right, it pulls the pull rope to move. The stop on the pull rope pushes the swing rod to rotate, so that all swing rods rotate in the same direction and contact the outer wall surface of the fan vent, thereby achieving support and clamping.

[0008] Furthermore, a spring is connected between the swing arm and the frame of the aluminum alloy frame. When the pull rope pulls the baffle away from the swing arm, the elastic force of the spring pushes the inner end of the swing arm to rotate away from the fan vent.

[0009] Furthermore, the drive mechanism includes two sets of synchronous belt slides and a drive motor. The synchronous belt slides are fixed parallel to the upper and lower side frames of the aluminum alloy frame. A slider is installed on the synchronous belt slide. The measuring frame has a U-shaped structure, with its two ends fixed to the upper and lower sliders. A transmission shaft is connected between the synchronous pulleys on the same side of the two sets of synchronous belt slides. The drive motor is mounted on the aluminum alloy frame through a motor frame, and its output end is connected to the transmission shaft. The synchronous operation of the two sets of synchronous belt slides is realized through the transmission shaft.

[0010] Furthermore, multiple helical tubes are fixedly arranged vertically on the measuring frame. An adjusting rod is provided at the front end of each helical tube, and a threaded wire matching the helical tube is provided at the rear end of the adjusting rod. The adjusting rod is threadedly installed inside the helical tube. The wind speed sensor is installed at the front end of the adjusting rod and faces the fan vent.

[0011] Furthermore, the movable handle includes a mounting base, a connecting rod, and a handle bar. The mounting base is symmetrically fixed on the upper frame of the aluminum alloy frame, and the handle bar is arranged parallel above the upper frame. The two ends of the handle bar and the mounting base are hinged together by the connecting rod. The section of the pull rope connected to the handle bar is made of spring steel wire rope.

[0012] Furthermore, a pull pin is vertically arranged in the middle of the connecting rod, and the elastic pull member is a tension spring or elastic rope. The two ends of the elastic pull member are respectively fixedly connected to the upper frame of the aluminum alloy frame and the pull pin of the connecting rod. After the movable connecting rod is flipped, the connecting rod is pulled by the elastic pull member to realize the flipping limit of the movable connecting rod.

[0013] Furthermore, a guide seat is provided at the corner of the aluminum alloy frame, and the pull rope is guided by the guide seat when it passes through the corner of the aluminum alloy frame.

[0014] Furthermore, multiple positioning holes are arranged on the upper frame of both the handle and the aluminum alloy frame, and positioning pins are inserted into the positioning holes to achieve precise positioning of the movable handle.

[0015] The beneficial effects of this invention are: This device adopts an aluminum alloy frame structure, utilizing the low density and high strength characteristics of aluminum alloy to significantly reduce the weight of the device while ensuring overall structural stability. Compared with traditional fixed wind tunnels, it can be easily moved by a single person, enabling rapid transfer between different fans and agricultural facilities. Furthermore, the aluminum alloy frame, together with the support mechanism, through the coordinated action of the movable handle and the swing arm, can be installed and disassembled with ventilation openings of different sizes of fans in a short time, adapting to various models of facility agriculture fans. There is no need to customize a fixed structure for specific fans, solving the problem of poor adaptability of traditional measuring devices to the field environment. The support mechanism adopts a movable handle with a parallelogram linkage structure, combined with the double fixation of elastic pull parts and positioning pins. The operator can clamp and position the device by flipping the handle with one hand, without the need for professional tools, reducing the skill requirements of the operator and making it suitable for small and medium-sized farmers. The drive mechanism adopts a rigid connection design between two sets of synchronous belt slides and the drive shaft to ensure the accurate movement trajectory of the measuring frame. Combined with the longitudinal distribution of multiple wind speed sensors on the measuring frame, a grid-like measurement mode of longitudinal distribution + lateral scanning is formed, realizing panoramic acquisition of wind speed distribution across the entire cross section of the fan vent, avoiding the errors caused by single-point measurement of handheld anemometers. The measuring component, through the threaded connection structure of the solenoid and the adjusting rod, can accurately adjust the distance between the wind speed sensor and the vent according to the wind speed gradient characteristics of the fan outlet, further improving the accuracy of the measurement results. The device integrates a control unit, a data acquisition module, and a drive mechanism to achieve full automation of the measurement process. After the device is started, the drive mechanism automatically drives the measuring frame to complete a full-section scan. The wind speed sensor collects data in real time, and the control unit automatically calculates the total air volume through an integral algorithm. No manual intervention is required, which greatly shortens the measurement time of the fan. Attached Figure Description

[0016] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the present invention; Figure 4 This is a schematic diagram of the drive mechanism structure of the present invention; Figure 5 This is a schematic diagram of the wind speed sensor structure of the present invention; Figure 6 This is a schematic diagram of the support mechanism and aluminum alloy frame structure of the present invention; Figure 7 This is a schematic diagram of the support mechanism and the fan vent support structure of the present invention; Figure 8 This is a partially enlarged structural schematic diagram of the present invention; Figure 9 This is a schematic diagram of the support mechanism structure of the present invention; Figure 10 This is a schematic diagram illustrating the state changes of the support mechanism of the present invention.

[0017] In the diagram: 1. Fan vent; 2. Aluminum alloy frame; 3. Drive mechanism; 301. Synchronous belt slide; 302. Slider; 303. Drive motor; 304. Transmission shaft; 4. Measuring frame; 5. Measuring assembly; 501. Screw; 502. Adjusting rod; 503. Wind speed sensor; 6. Movable handle; 601. Handle lever; 602. Mounting base; 603. Connecting rod; 7. Slot; 8. Swing rod; 9. Pull rope; 10. Stop; 11. Spring; 12. Elastic tensioning element; 13. Guide seat; 14. Positioning hole; 15. Positioning pin. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Please see Figure 1-10This invention provides a portable automatic air volume measurement device for facility agriculture fans, which can be widely used in various greenhouses, livestock and poultry houses and other facility agriculture fields that require fan air volume adjustment. Through real-time and accurate air volume measurement, it can help agricultural production managers adjust the operating status of fans in a timely manner, optimize air circulation and environmental control, and improve the production efficiency of facility agriculture. Example

[0020] according to Figure 1 , Figure 2 and Figure 3 As shown, a portable automatic airflow measurement device for agricultural ventilation fans includes a fan vent 1 installed on the wall of an agricultural or livestock building, with the fan installed inside the vent. It also includes an aluminum alloy frame 2, a drive mechanism 3, a measuring frame 4, and an electronic control module. The aluminum alloy frame 2 consists of four aluminum alloy frame members connected end-to-end to form a square structure. Its dimensions are compatible with the shape of common fan vents 1, allowing it to be stably mounted on the outside of the vent, providing a supporting foundation for the entire device. The low density and high strength of aluminum alloy ensure the structural stability of the frame while reducing the overall weight, facilitating its transfer between fans in different agricultural facilities.

[0021] The drive mechanism 3 is mounted on the aluminum alloy frame 2 and is used to drive the measuring frame 4 to achieve precise movement. Specifically, as follows... Figure 4 As shown, the drive mechanism 3 includes two sets of synchronous belt slides 301, a drive motor 303, and a transmission shaft 304. The two sets of synchronous belt slides 301 are fixed parallel and symmetrically on the upper and lower side frames of the aluminum alloy frame 2. A slider 302 is installed on the synchronous belt slide 301 and can slide along the length of the synchronous belt slide. The measuring frame 4 adopts a U-shaped structure, and its two ends are fixedly connected to the upper and lower sliders 302 respectively, so that the movement of the sliders 302 can directly drive the measuring frame 4 to move synchronously. In order to ensure the consistency of movement of the two sets of synchronous belt slides 301, a transmission shaft 304 is connected between the synchronous pulleys on the same side of the two sets of synchronous belt slides 301. The drive motor 303 is fixed to the side of the aluminum alloy frame 2 through the motor frame, and its output shaft is connected to the transmission shaft 304 through a coupling. When the drive motor 303 starts, the power is transmitted through the transmission shaft 304 to the synchronous pulleys of the two sets of synchronous belt slides 301, which drives the synchronous belt to rotate, thereby causing the upper and lower sliders 302 to move synchronously, and finally realizes the smooth left and right movement of the measuring frame 4 in front of the fan vent 1.

[0022] Multiple measuring components 5 are arranged vertically at intervals on the measuring frame 4. The measuring components 5 are wind speed sensors 503, and the detection direction of all wind speed sensors 503 is towards the fan vent 1. By controlling the forward and reverse rotation of the drive motor 303, the measuring frame 4 can move back and forth within the lateral range of the fan vent 1. Combined with the longitudinal distribution of multiple wind speed sensors 503 on the measuring frame 4, it is possible to achieve full coverage measurement of wind speed across the entire cross-section of the fan vent 1. After obtaining the wind speed distribution across the cross-section of the fan vent 1, the total air volume (air volume = wind speed × cross-sectional area) is calculated.

[0023] Compared to the traditional handheld anemometer's single-point manual measurement, this embodiment uses a combination of longitudinal distribution and lateral scanning through the drive mechanism 3, so that the sensor's measurement points form a grid-like coverage, achieving panoramic acquisition of the wind speed distribution across the cross-section of the fan vent 1. This not only reduces the intensity of manual operation but also allows for the measurement of the wind speed distribution of the entire vent in a short time. At the same time, the full-coverage measurement mode reduces the error in the air volume calculation results and improves the accuracy of the measurement results.

[0024] The electronic control module of this device includes: a control unit: using a microprocessor as the core control unit, mounted on an aluminum alloy frame, whose core functions include receiving user commands, controlling the forward and reverse rotation and speed of the drive motor 303, synchronously triggering the data acquisition of the wind speed sensor 503, and processing the air volume calculation algorithm; a data acquisition module: integrated into the control unit, the wind speed sensor 503 is connected to the data acquisition module through a shielded wire, the data signal monitored by the sensor is transmitted to the control unit through the data acquisition module, and the wind speed data is multiplied by the cross-sectional area of ​​the duct through an algorithm to obtain the air volume data; the wind speed sensor is an impeller-type wind speed sensor, using RS485 communication, which can accurately measure the wind speed when the fan is working, detect wind speed changes through a thermocouple, convert the signal into an electrical signal, and transmit it to the data acquisition module; a display module: this module displays the current fan air volume data in real time through an LCD screen or OLED screen; and a power supply module: using a rechargeable lithium battery as the power source, providing a stable power supply for the device, supporting long-term use, and at the same time, the power supply module has overcharge and over-discharge protection functions to ensure stable operation of the device.

[0025] In practical use, the portable automatic air volume measurement device for facility agriculture fans of the present invention first aligns the aluminum alloy frame 2 with the fan vent 1, making its frame aligned with the edge of the vent. Then, the drive motor 303 is started, which drives two sets of synchronous belt slides 301 through the transmission shaft 304. The slider 302 drives the measuring frame 4 to move from the left side to the right side of the vent. During the movement, the wind speed sensor 503 on the measuring frame 4 collects wind speed data at each point in real time. When the measuring frame 4 moves to the right limit position of the vent, the drive motor reverses and drives the measuring frame back to the initial position, completing one full-section scan. The system calculates the collected wind speed data to obtain the air volume of the fan. Example

[0026] Based on Example 1, this example achieves the support stability of the aluminum alloy frame 2 and the fan vent 1 through a support mechanism.

[0027] like Figures 6-10 As shown, the support mechanism includes a movable handle 6, a swing rod 8, a pull rope 9, a spring piece 11, and an elastic traction component 12. The movable handle 6 adopts a parallelogram linkage structure, specifically composed of a handle rod 601, a mounting base 602, and a connecting rod 603. The mounting base 602 is symmetrically welded to the upper frame of the aluminum alloy frame 2. The handle rod 601 is arranged parallel above the upper frame. The two ends of the handle rod are respectively hinged to the mounting base 602 on the same side through the connecting rod 603. That is, the two ends of the connecting rod 603 are respectively hinged to the handle rod 601 and the mounting base 602 to form a rotating pair. The handle rod 601 can achieve a stable flipping movement around the mounting base 602, and always remains parallel to the upper frame during the movement, making it convenient for the operator to grip and exert force.

[0028] The four side frames of the aluminum alloy frame 2 are all made of H-beams with an H-shaped cross-section, including two parallel flanges and a web connecting the flanges. Multiple slots 7 are evenly distributed along the length of the web. A swing rod 8 is rotatably mounted in each slot 7 via a pin. The inner end of the swing rod 8, facing the fan vent 1, has an arc-shaped contact surface to adapt to the arc or flat structure of the fan vent's outer wall. A rubber sleeve is provided at the end to provide flexible support to the fan vent's outer wall and increase friction. A traction hole is drilled through the outer end of the swing rod. A pull rope 9 passes through the traction holes of all the swing rods 8, connecting them in series. The two ends of the pull rope 9 are connected to both sides of the handle 601. Each swing rod has a corresponding traction hole on its pull rope 9. A stop 10 is fixed to the position of lever 8. The stop can be made of rubber sleeve or metal ring. When the operator flips the handle lever 601 to the right, the pull rope 9 is pulled and drives the stop 10 to move closer to the swing arm. The stop 10 pushes the swing arm 8 to rotate around the pin, so that the inner end of the swing arm 8 approaches and eventually contacts the outer wall surface of the fan vent 1. Through the coordinated action of multiple sets of swing arms 8, the aluminum alloy frame 2 and the fan vent 1 are clamped and fixed. The swing amplitude of the swing arm is controlled by the pull rope. The section where the pull rope 9 connects to the handle lever 601 is made of spring steel wire rope, which has a certain elastic deformation capacity. The elastic deformation of the spring steel wire rope can compensate for the error of different vent sizes, so that the support component can be adapted to fan vents of similar size. Guide seats 13 are installed at the four corners of the aluminum alloy frame 2. When the pull rope 9 passes through the corners, it is guided by the guide seats 13, which can reduce the wear of the pull rope 9 and reduce the movement resistance.

[0029] To achieve the reset of the swing arm 8, a spring piece 11 is connected between the swing arm 8 and the frame of the aluminum alloy frame 2. One end of the spring piece 11 is fixed to the web of the frame, and the other end is connected to the middle of the swing arm 8. When the handle 601 is flipped to the left, the pull rope 9 is released, the stop 10 moves away from the swing arm 8, and the elastic force of the spring piece 11 pushes the swing arm 8 to rotate in the opposite direction, so that the inner end of the swing arm 8 moves away from the fan vent 1, making it easier to disassemble the device.

[0030] In addition, a pull pin is vertically welded to the middle of the connecting rod 603, and the two ends of the elastic pull member 12 are respectively connected to the web plate of the upper frame and the pull pin. The elastic pull member can be a tension spring or an elastic rope. When the handle 601 is flipped to the position where the swing arm clamps the fan vent, the elastic pull member 12 is in a stretched state and forms a stable triangular structure with the mounting base and the connecting rod. The tension of the elastic pull member can position the connecting rod 603 in the current direction, preventing the connecting rod from flipping in the opposite direction, thereby limiting the rotation direction of the swing arm and providing stable clamping and support for the fan vent. Through the cooperation between the above structures, the device can be installed or disassembled with the fan vent 1 in a short time and is adaptable to vents of different sizes.

[0031] In practical use, the portable automatic air volume measuring device for facility agriculture fans of this invention is first placed on the outside of the fan vent. The operator holds the handle 601 and pulls it to the right, causing the connecting rod of the parallelogram mechanism to flip to the right. The handle pulls the baffle 10 through the pull rope 9, and the baffle pushes the swing rod 8 to rotate around the pin shaft, so that the inner end of the swing rod gradually approaches the outer wall of the fan vent 1. When the inner end of the swing rod contacts the outer wall of the vent and generates a pre-tightening force, the elastic pulling member 12 is in a stretched state. The connecting rod 603 is positioned by the pulling force, and the swing rod is kept in a clamped state. After the measurement is completed, the handle 601 is flipped in the opposite direction, the pull rope is released, and the elasticity of the spring 11 pushes the inner end of the swing rod away from the vent, completing the disassembly. Example

[0032] This embodiment optimizes the structure of the measuring component 5 to adapt to the outlet distance and wind speed distribution characteristics of different fans.

[0033] like Figure 5 As shown, multiple solenoids 501 are fixed vertically at intervals on the measuring frame 4. An adjusting rod 502 is provided at the front end of each solenoid 501. An external thread matching the internal thread of the solenoid 501 is machined on the outer rear end of the adjusting rod 502. The adjusting rod 502 is installed inside the solenoid 501 through threaded engagement. The wind speed sensor 503 is fixed at the front end of the adjusting rod 502, and its detection direction always faces the fan vent 1. The length of the adjusting rod 502 extending out of the solenoid 501 can be changed by rotating it, thereby adjusting the distance between the wind speed sensor 503 and the fan vent 1, so that the sensor is more accurately placed in the effective measurement area, improving the measurement accuracy of the sensor. At the same time, the threaded adjustment method is simple to operate, requires no special tools, and is convenient for quick on-site adjustment according to the fan model. Example

[0034] Based on Embodiment 2, multiple positioning holes 14 are correspondingly opened on the upper frame of the handle 601 and the aluminum alloy frame 2 along the length direction. When the movable handle 6 is flipped to the clamping position where the swing arm 8 contacts the outer wall of the fan vent 1, the positioning pin 15 can be inserted into the aligned positioning hole 14 to achieve mechanical positioning of the movable handle 6, restrict the degree of freedom of the movable handle 6 to avoid positioning failure caused by elastic fatigue of the elastic tension member 12 after long-term use, and form a dual fixation of elastic tension and mechanical positioning.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable automatic airflow measurement device for facility agriculture fans, comprising a fan vent (1) installed on a wall, characterized in that, It also includes an aluminum alloy frame (2), a drive mechanism (3) and a measuring frame (4). The aluminum alloy frame (2) is a square frame structure formed by connecting the ends of four side frames. The aluminum alloy frame (2) supports the measuring device at the fan vent (1). The drive mechanism (3) is set on the aluminum alloy frame (2). The measuring frame (4) is installed on the slider (302) of the drive mechanism (3). Multiple measuring components (5) are arranged vertically on the measuring frame (4). The measuring components (5) adopt wind speed sensors (503). The drive mechanism (3) drives the measuring frame (4) to move left and right in front of the fan vent (1) so that the measuring range of the measuring components (5) covers the entire fan vent (1).

2. The portable automatic airflow measuring device for facility agriculture fans according to claim 1, characterized in that, A support mechanism is provided on the aluminum alloy frame (2) to support the aluminum alloy frame (2) at the fan vent (1). The support mechanism includes a movable handle (6), which is a parallelogram-shaped linkage structure installed on the upper side of the aluminum alloy frame (2). An elastic pull member (12) is connected between the movable handle (6) and the aluminum alloy frame (2) to achieve the pull positioning of the movable handle (6). Slots (7) are evenly distributed on each side of the aluminum alloy frame (2). A swing rod (8) is rotatably fitted in the slot (7) through a pin. The inner end of the swing rod (8) faces the fan vent (1), and the outer end has a traction hole. A pull rope (9) is inserted into the traction hole. The pull rope (9) passes through all the swing rods (8) and connects them in series. The two ends of the pull rope (9) are respectively connected to the two sides of the movable handle (6). A stop (10) is fixedly installed on the pull rope (9) near each swing rod (8). When the movable handle (6) swings left and right, it pulls the pull rope (9) to move. The stop (10) on the pull rope (9) pushes the swing rod (8) to rotate, so that each swing rod (8) rotates in the same direction and contacts the outer wall of the fan vent (1) to achieve support and clamping.

3. The portable automatic airflow measuring device for facility agriculture fans according to claim 2, characterized in that, A spring plate (11) is connected between the swing rod (8) and the frame of the aluminum alloy frame (2). When the pull rope (9) pulls the baffle (10) away from the swing rod (8), the elastic force of the spring plate (11) pushes the inner end of the swing rod (8) to rotate away from the fan vent (1).

4. The portable automatic airflow measuring device for facility agriculture fans according to claim 1, characterized in that, The drive mechanism (3) includes two sets of synchronous belt slides (301) and a drive motor (303). The synchronous belt slides (301) are fixed in parallel on the upper and lower side frames of the aluminum alloy frame (2). A slider (302) is installed on the synchronous belt slides (301). The measuring frame (4) has a U-shaped structure, and its two ends are fixed on the upper and lower sliders (302). A transmission shaft (304) is connected between the synchronous wheels on the same side of the two sets of synchronous belt slides (301). The drive motor (303) is installed on the aluminum alloy frame (2) through a motor frame, and its output end is connected to the transmission shaft (304). The synchronous operation of the two sets of synchronous belt slides (301) is realized through the transmission shaft (304).

5. A portable automatic airflow measuring device for facility agriculture fans according to claim 1, characterized in that, The measuring frame (4) has multiple solenoids (501) arranged vertically and fixedly. An adjusting rod (502) is provided at the front end of the solenoid (501). The rear end of the adjusting rod (502) is provided with a threaded wire that matches the solenoid (501). The adjusting rod (502) is threadedly installed inside the solenoid (501). The wind speed sensor (503) is installed at the front end of the adjusting rod (502) and faces the fan vent (1).

6. A portable automatic airflow measuring device for facility agriculture fans according to claim 2, characterized in that, The movable handle (6) includes a mounting base (602), a connecting rod (603), and a handle bar (601). The mounting base (602) is symmetrically fixed on the upper frame of the aluminum alloy frame (2). The handle bar (601) is arranged parallel above the upper frame, and the two ends of the handle bar (601) and the mounting base (602) are hinged through the connecting rod (603). The section of the pull rope (9) connected to the handle bar (601) is made of spring steel wire rope.

7. A portable automatic airflow measuring device for facility agriculture fans according to claim 6, characterized in that, A pull pin is vertically arranged in the middle of the connecting rod (603). The elastic pull member (12) is a tension spring or elastic rope. The two ends of the elastic pull member (12) are fixedly connected to the upper frame and the pull pin, respectively. After the movable connecting rod (603) is flipped, the connecting rod (603) is pulled by the elastic pull member (12) to realize the flipping limit of the movable connecting rod (603).

8. A portable automatic airflow measuring device for facility agriculture fans according to claim 2, characterized in that, A guide seat (13) is provided at the corner of the aluminum alloy frame (2). When the pull rope (9) passes through the corner of the aluminum alloy frame (2), it is guided by the guide seat (13).

9. A portable automatic airflow measuring device for facility agriculture fans according to claim 6, characterized in that, Multiple positioning holes (14) are arranged on the upper frame of the handle (601) and the aluminum alloy frame (2). Positioning pins (15) are inserted into the positioning holes (14) to achieve precise positioning of the movable handle (6).

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