A flow meter measurement accuracy testing device and a test method thereof

Abstract

The present invention discloses a flow meter measurement accuracy test device and a test method thereof, which relates to the technical field related to air flow meter testing, and comprises a base, wherein two sets of guide rails are fixed on the top surface of the base, and a set of movable plates on which an air flow meter can be placed are slidably arranged on the outer side of the guide rails; the interior of the limiting mechanism comprises a placement groove opened at the inner center position of the movable plate, a set of connecting gear rings are rotatably arranged inside the placement groove, a set of rotating grooves are opened on the top of the rotating gear, and a set of clamping rods that can limit the air flow meter body are fitted inside the rotating groove. The flow meter measurement accuracy test device and the test method thereof are provided with a limiting mechanism and a multi-directional air blowing mechanism, and the setting of the limiting mechanism can perform multi-directional limiting processing on the outer side of the air flow meter body, and the magnitude of the voltage can be judged, thereby judging the accurate performance of the air flow meter body.

Description

Technical Field

[0001] The present invention relates to the technical field related to air flow meter testing, and in particular to a flow meter measurement accuracy testing device and a testing method thereof. Background Art

[0002] An air flow meter is a device that converts the inhaled air flow into an electrical signal. The advantages of an air flow meter are extremely small pressure loss and a large measurable flow range. The ratio of the maximum flow to the minimum flow of an air flow meter is generally above 20:1. It is applicable to a wide range of industrial pipe diameters, up to 3V. The output signal is linear with the measured flow rate and has high accuracy. When producing air flow meters, detection and processing are required, so it is necessary to use

[0003] An air flow meter detection device disclosed in the publication number "CN218239006U" is published on 2023-01-06. The detection device can effectively realize fixed position clamping through the cooperation of a fixed clamping ring and a sliding clamping ring, reducing the difficulty of center alignment. At the same time, through electromagnetic drive, the clamping action operation can be effectively controlled, which improves the convenience of device operation; the air flow meter is limited by a set two-way limit mechanism. However, in the process of production and detection, it is necessary to detect a large number of air flow meters. After a group is detected, human cooperation and mechanical cooperation are required to disassemble the limit processing, which is time-consuming and labor-intensive;

[0004] The automobile air flow meter detection device disclosed by the announcement number "CN201387355Y" has a publication date of 2010-01-20. In the air flow meter detection device, an air compressor tank and a vacuum tank are respectively installed at both ends of the test pipe. A negative pressure state is formed in the test pipe through the air supply of the air compressor tank and the exhaust of the vacuum tank. With this structure, the energy utilization rate and the wind speed in the test pipe can be effectively improved while using one air flow generating device. The air flow meter is detected by air flow. Although a certain detection can be performed, when detecting by wind force, it is necessary to perform wind force blowing detection on different ranges of the air flow meter. The above-mentioned device only processes one side of the air flow meter and cannot perform detection and processing very effectively.

[0005] Therefore, we propose a flow meter measurement accuracy test device and a test method thereof to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a flow meter measurement accuracy testing device and a testing method thereof, so as to solve the problems raised by the above background technology that the air flow meter detection device currently on the market does not have efficient detection processing for air flow meter detection and is inconvenient to perform multi-range detection processing during wind force detection.

[0007] To achieve the above object, the present invention provides the following technical solution: a flow meter measurement accuracy test device, comprising a base, two sets of guide rails are fixed at the top surface of the base, and a set of movable plates on which an air flow meter can be placed are slidably arranged on the outer side of the guide rails;

[0008] A group of display components are installed at the top position of the base, and one side of the display component is connected to one side of the first electric push rod through a connecting line, and the display component is also connected to the connecting end of the meter through a connecting line; a group of fixed racks are fixed at the top rear side of the base, and the outer side of the fixed racks is connected to one side of the limiting mechanism, and the interior of the limiting mechanism includes a placement groove opened at the center position of the inner part of the moving plate, and a group of connecting gear rings are rotatably arranged inside the placement groove, and three groups of rotating gears are arranged inside the connecting gear rings, and a group of rotating grooves are opened on the top of the rotating gears, and a group of clamping rods that can limit the air flow meter body are fitted inside the rotating grooves;

[0009] Four groups of support rods are fixed on the right side of the base, a group of fixed plates are fixed on the top of the support rods, a group of second electric push rods are fixed on the bottom right side of the fixed plates, the output end of the second electric push rods is fixed on the top of the guide plate, and two groups of multi-directional air blowing mechanisms are rotatably arranged on the bottom of the guide plate.

[0010] Preferably, the outer position of the fixed rack is meshed with the end of the connecting gear ring extending out of the outside of the movable plate, and a group of inner gear rings are fixed to the inner position of the connecting gear ring, and the inner side of the inner gear ring is meshed with the outer position of the rotating gear, so that the rotation of the inner gear ring can drive the rotating gear to rotate inside the movable plate.

[0011] Preferably, the rotating groove opened at the top of the rotating gear is inclined, the outer side of the clamping rod is slidably set at the inner position of the rotating groove, the top position of the clamping rod extends out of the top position of the moving plate through the sliding groove opened at the top of the moving plate, and the moving directions of the three groups of clamping rods are relatively set, so that the three groups of clamping rods can be used to limit the outer position of the air flow meter body.

[0012] Preferably, a group of meters that can display voltage values ​​and capacity are fixed at the top center position of the fixed disk, two groups of movable electrode sheets are connected to the bottom position of the meters, a group of support plates are fixed at the front and rear positions on the right side of the base, a group of first electric push rods are fixed at the top position of the support plates, the output ends of the first electric push rods are fixed to one side of the fixed block, the top position of the fixed block is fixed to the bottom position of the fitting disk, the bottom of the fixed block is slidably arranged on the outer wall of the guide block fixed to one side of the support plate, the first electric push rod can be driven to work by the control of the display component, and the side wall of the air flow meter body can also be limited.

[0013] Preferably, the outer side of the guide plate is slidably set on the outer side of the support rod, and the maximum moving range of the guide plate through the second electric push rod is smaller than the distance from the bottom end of the fan to the top surface of the base. The multi-directional blowing mechanism can be adjusted to blow air at different positions, thereby facilitating the detection and processing of the voltage of the air flow meter body.

[0014] Preferably, the multi-directional air blowing mechanism includes a dual-axis motor arranged below the guide plate, the front output end of the dual-axis motor is fixed to one side of the fan through a coupling, the rear output end of the dual-axis motor is fixed to the end of the worm, the outer side of the worm is meshed and connected to the outer side of the worm wheel of the gear set, the upper side of the gear set is meshed and connected to the outer side of the connecting gear, a group of cams are fixed at the top center position of the connecting gear, the outer side of the cam is rotatably connected to the outer side of the support frame, the outer side of the air flow meter body can be blown by wind, and the voltage change can be displayed through the display part.

[0015] Preferably, the top position of the support frame is connected to the bottom position of the guide plate through a bearing, and the swing rates of the two groups of multi-directional air blowing mechanisms are set to be consistent, so that the support frame can rotate stably at the bottom position of the guide plate, thereby performing multi-directional air blowing treatment.

[0016] Preferably, the interior of the gear set includes a worm gear and a gear, the outer side of the gear is meshedly connected to the outer side of the connecting gear, and the center axis end position of the gear set is rotatably connected to the internal position of the support frame, so that the gear set can rotate stably inside the support frame.

[0017] Preferably, the outer side of the cam is rotatably connected to a group of rods on the outer side of the support frame, and the rods on the outer side of the support frame are rotatably arranged at the bottom position of the guide plate. The dual-axis motor forms a rotating structure between the support frame and the bottom position of the guide plate, and can drive the support frame to rotate at the bottom position of the guide plate through the setting of the cam.

[0018] A method for testing a flow meter measurement accuracy test device comprises the following steps:

[0019] S1: The air flow meter body is placed on the top of the moving plate, and the moving plate is pushed to slide on the outside of the guide rail, so that the connecting gear ring connected to the inner side of the moving plate is rotated through the fixed rack, so that the connecting gear ring drives the inner gear ring to rotate together;

[0020] S2: The rotation of the inner gear ring can drive the meshing rotating gear to rotate, and the rotating gear can stably rotate inside the moving plate. The rotating gear drives the rotating groove to rotate and drives the clamping rod to slide in the sliding groove provided on the moving plate, so as to limit the air flow meter body;

[0021] S3: The fixed block and the fitting plate are driven to move by the first electric push rod, so that the fitting plate will fit on the outside of the air flow meter body, thereby achieving the purpose of limiting the side wall of the air flow meter body;

[0022] S4: Use the electrode sheet set by the meter to detect the output voltage of the sensor connected to the conductive end of the air flow meter body. Under normal circumstances, it should be 5V. If the value is accurate, the detection is completed. If the value is inaccurate, start the wind force detection mode.

[0023] S5: Start the multi-directional blowing mechanism to blow air at different angles on the outside of the air flow meter body. At this time, observe through the display component that the voltage changes normally with the size of the air intake volume, which indicates that the air flow meter body is working normally; if the voltage remains unchanged or changes slightly, it indicates that there is a fault in the air flow meter body, which facilitates the meter to perform capacity measurement processing.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: the flow meter measurement accuracy test device and the test method thereof are provided with a limit mechanism and a multi-directional air blowing mechanism, and the setting of the limit mechanism can perform multi-directional limit processing on the outer side of the air flow meter body, and the multi-directional air blowing mechanism can make the air flow meter body judge the voltage when the power is turned on for detection, so as to judge the accurate performance of the air flow meter body, and the specific contents are shown as follows:

[0025] 1. A limit mechanism is set up. The connecting gear ring that rotates inside the moving plate will slide through the fixed rack. The inner gear ring that rotates inside the connecting gear ring will drive the rotating gear to rotate inside the moving plate. At this time, the rotating gear drives the rotating groove to rotate, causing the three groups of clamping rods to move relative to each other, so that the clamping rods will stably limit the air flow meter body;

[0026] Furthermore, a first electric push rod is provided, and the output end of the first electric push rod drives the fixed block to slide on the outside of the guide block, and the fitting plate fixed on the top of the fixed block will fit on the outside of the air flow meter body, and the clamping rod and the fitting plate are provided to perform multi-range limit processing;

[0027] Furthermore, a movable plate is provided, and by extending and retracting the movable plate, the clamping rod slidably arranged inside the movable plate can be relatively moved, making it more convenient to detect and process the air flow meter body;

[0028] 2. A multi-directional air blowing mechanism is provided. The output end of the dual-axis motor drives the rotation of the worm, which drives the meshing gear set to rotate. The worm wheel rotates stably inside the support frame. The gear on one side of the gear set will drive the meshing connecting gear to rotate, which will cause the cam set on the top of the connecting gear to rotate, so that the support frame will rotate on the outside of the bottom of the guide plate, and multi-directional air blowing can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the right side structure of the base of the present invention;

[0031] Figure 3 This is a schematic diagram of the main structure of the movable plate of the present invention;

[0032] Figure 4 This is a schematic diagram of the main cross-sectional structure of the movable plate of the present invention;

[0033] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0034] Figure 6 This is a schematic diagram of the main structure of the display element of the present invention;

[0035] Figure 7 This is a schematic diagram of the main structure of the first electric push rod of the present invention;

[0036] Figure 8 For the present invention Figure 1 The enlarged structural diagram at B in the middle;

[0037] Fig. 9 This is a schematic diagram of the main structure of the worm of the present invention;

[0038] Fig.10 It is a schematic diagram of the rear view structure of the worm gear of the present invention.

[0039] In the figure: 1. base; 2. guide rail; 3. moving plate; 4. display part; 5. fixed rack; 6. connecting gear ring; 7. inner gear ring; 8. placement groove; 9. rotating gear; 10. rotating groove; 11. clamping rod; 12. slide groove; 13. support rod; 14. fixed disk; 15. meter; 16. support plate; 17. connecting line; 18. first electric push rod; 19. fixed block; 20. fitting disk; 21. guide block; 22. second electric push rod; 23. guide plate; 24. dual-axis motor; 25. fan; 26. worm; 27. gear set; 28. connecting gear; 29. ​​cam; 30. support frame; 31. air flow meter body. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 10 , the present invention provides the following technical solutions:

[0042] Embodiment 1: In order to solve the problem that the air flow meter detection device currently on the market does not have efficient detection processing for air flow meter detection, please refer to the attached Figure 1 -Attached Figure 5, including a base 1, two sets of guide rails 2 are fixed on the top surface of the base 1, and a set of movable plates 3 on which an air flow meter can be placed are slidably arranged on the outer side of the guide rails 2; a set of display members 4 are installed on the top of the base 1, and one side of the display member 4 is connected to one side of a first electric push rod 18 through a connecting line 17, and the display member 4 is also connected to the connecting end of the meter 15 through the connecting line 17; a set of fixed racks 5 are fixed on the top rear side of the base 1, and the outer side of the fixed racks 5 is connected to one side of the limiting mechanism, and the interior of the limiting mechanism includes the inner side of the movable plate 3 The placement groove 8 is opened at the center position of the part, a group of connecting gear rings 6 are rotatably arranged inside the placement groove 8, three groups of rotating gears 9 are arranged inside the connecting gear rings 6, a group of rotating grooves 10 are opened at the top of the rotating gear 9, and a group of clamping rods 11 that can limit the position of the air flow meter body 31 are fitted inside the rotating grooves 10; the outer position of the fixed rack 5 is meshed and connected with the end position of the connecting gear ring 6 extending out of the outer side of the moving plate 3, and a group of inner gear rings 7 are fixed at the inner position of the connecting gear ring 6, and the inner side of the inner gear ring 7 is meshed and connected with the outer position of the rotating gear 9. The rotating groove 10 opened at the top of the rotating gear 9 is inclined, and the outer side of the clamping rod 11 is slidably set at the inner position of the rotating groove 10. The top position of the clamping rod 11 extends out of the top position of the moving plate 3 through the sliding groove 12 opened at the top of the moving plate 3, and the moving directions of the three groups of clamping rods 11 are relatively set. A group of meters 15 that can display voltage values ​​and capacity are fixed at the top center position of the fixed disk 14, and two groups of movable electrode sheets are connected to the bottom position of the meter 15. A group of support plates 16 are fixed at the front and rear positions on the right side of the base 1, and a group of first electric push rods 18 are fixed at the top position of the support plate 16. The output end of the first electric push rod 18 is fixed to one side of the fixed block 19, and the top position of the fixed block 19 is fixed to the bottom position of the bonding disk 20. The bottom of the fixed block 19 is slidably arranged on the outer wall of the guide block 21 fixed to one side of the support plate 16.By taking out the movable plate 3 and placing the air flow meter body 31 on the top position of the movable plate 3, the movable plate 3 is pushed to the right end position of the base 1, and the connecting gear ring 6 rotatably connected inside the movable plate 3 will slide through the fixed rack 5, so that the connecting gear ring 6 rotates inside the movable plate 3, causing the inner gear ring 7 set inside the connecting gear ring 6 to drive the rotating gear 9 to rotate inside the movable plate 3. At this time, the rotating gear 9 will drive the rotating groove 10 to rotate when rotating, causing the clamping rod set inside the rotating groove 10 to rotate. 11 slides relatively at the top position of the movable plate 3 through the slide groove 12, so that the clamping rod 11 will stably limit the air flow meter body 31, and the first electric push rod 18 is controlled by the connecting line 17 through the setting of the display part 4, so that the output end of the first electric push rod 18 drives the fixed block 19 to slide on the outside of the guide block 21, and the bonding plate 20 fixed on the top of the fixed block 19 will be bonded to the outside of the air flow meter body 31, so as to achieve multi-directional stable limiting processing of the air flow meter body 31, thereby facilitating detection processing:.

[0043] Embodiment 2: In order to solve the problem that the air flow meter detection devices currently on the market are not convenient for performing multi-range detection processing when detecting the air flow meter, four groups of support rods 13 are fixed to the right side of the base 1, a group of fixed plates 14 are fixed to the top of the support rods 13, a group of second electric push rods 22 are fixed to the bottom right side of the fixed plate 14, the output end of the second electric push rod 22 is fixed to the top of the guide plate 23, and two groups of multi-directional air blowing mechanisms are rotatably arranged at the bottom of the guide plate 23. The multi-directional blower mechanism includes a double-shaft motor 24 arranged below the guide plate 23, the front output end of the double-shaft motor 24 is fixed to one side of the fan 25 through a shaft coupling, the rear output end of the double-shaft motor 24 is fixed to the end of the worm 26, the outer side of the worm 26 is meshed and connected to the outer side of the worm wheel of the gear set 27, the upper side of the gear set 27 is meshed and connected to the outer side of the connecting gear 28, a group of cams 29 are fixed at the top center position of the connecting gear 28, and the outer side of the cam 29 is rotatably connected to the outer side of the support frame 30. The top position of the support frame 30 is connected to the bottom position of the guide plate 23 through a bearing, and the swing rates of the two groups of multi-directional blower mechanisms are set to be consistent. The inside of the gear set 27 includes a worm wheel and a gear, the outer side of the gear is meshed and connected to the outer side of the connecting gear 28, and the center shaft end position of the gear set 27 is rotatably connected to the inner position of the support frame 30. The outer side of the cam 29 is rotatably connected to a group of rods on the outer side of the support frame 30. The rods on the outer side of the support frame 30 are rotatably arranged at the bottom of the guide plate 23. The dual-axis motor 24 forms a rotating structure between the support frame 30 and the bottom of the guide plate 23. The outer side of the guide plate 23 is slidably arranged at the outer side of the support rod 13. The maximum moving range of the guide plate 23 through the second electric push rod 22 is less than the distance from the bottom end of the fan 25 to the top surface of the base 1.When the performance of the air flow meter body 31 is accurately tested, the electrode sheet below the meter 15 is first set to be fixed on one side of the conductive end. At this time, by observing the value of the voltage, when the vertical voltage is 5V, the performance of the air flow meter body 31 is accurate. When the voltage value is lower or higher than 5V, the second electric push rod 22 can be started at this time, so that the output end position of the second electric push rod 22 drives the guide plate 23 to slide stably on the outside of the support rod 13. When it reaches the appropriate position, the dual-axis motor 24 is started, so that the output ends of both ends of the dual-axis motor 24 drive the fan 25 and the worm 26 to rotate. At this time, the fan 25 will generate wind force, and the worm 26 is set. The outer position of the worm 26 will drive the gear set 2 The worm gear meshed with one side of the gear set 27 rotates, and the worm gear rotates stably inside the support frame 30, and the gear on one side of the gear set 27 will also rotate, so that the gear on one side of the gear set 27 will drive the meshed connecting gear 28 to rotate, thereby causing the cam 29 set on the top of the connecting gear 28 to rotate, so that the support frame 30 will rotate on the outside of the bottom of the guide plate 23, so that multi-angle swing processing can be performed, so that the wind blows to one side of the air flow meter body 31, and the wind force detection processing can be performed at this time. At this time, if the voltage changes normally with the size of the air intake, it indicates that the air flow meter body 31 is working normally; if the voltage does not change or changes slightly, it indicates that the air flow meter body 31 is faulty and needs to be replaced.

[0044] A method for testing a flow meter measurement accuracy test device comprises the following steps:

[0045] S1: The air flow meter body 31 is placed on the top of the moving plate 3, and the moving plate 3 is pushed so that the moving plate 3 slides on the outside of the guide rail 2, so that the connecting gear ring 6 rotatably connected to the inner side of the moving plate 3 is rotated through the fixed rack 5, so that the connecting gear ring 6 drives the inner gear ring 7 to rotate together;

[0046] S2: The inner gear ring 7 rotates to drive the meshing rotating gear 9 to rotate, and the rotating gear 9 rotates stably inside the moving plate 3. The rotating gear 9 drives the rotating groove 10 to rotate and drives the clamping rod 11 to slide in the sliding groove 12 provided on the moving plate 3, so as to limit the air flow meter body 31;

[0047] S3: The first electric push rod 18 drives the fixing block 19 and the fitting plate 20 to move, so that the fitting plate 20 will fit on the outside of the air flow meter body 31, so as to limit the side wall of the air flow meter body 31;

[0048] S4: The electrode sheet provided on the meter 15 is used to detect the output voltage of the sensor connected to the conductive end of the air flow meter body 31, which should be 5V under normal circumstances; if the value is accurate, the detection is completed; if the value is inaccurate, the wind force detection mode is started;

[0049] S5: By starting the multi-directional blowing mechanism, the multi-directional blowing mechanism blows air at different angles on the outside of the air flow meter body 31. At this time, the voltage is observed to change normally with the size of the air intake through the display part 4, which indicates that the air flow meter body 31 is working normally; if the voltage remains unchanged or changes slightly, it indicates that there is a fault in the air flow meter body 31, which facilitates the meter 15 to perform capacity measurement processing.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow meter measurement accuracy test device, comprising a base (1), wherein two sets of guide rails (2) are fixed at the top surface of the base (1), and a set of movable plates (3) on which an air flow meter can be placed are slidably arranged on the outer sides of the guide rails (2); Features: A group of display elements (4) are installed at the top position of the base (1), and one side of the display element (4) is connected to one side of the first electric push rod (18) through a connecting line (17), and the display element (4) is also connected to the connecting end of the meter (15) through the connecting line (17); a group of fixed racks (5) are fixed at the top rear position of the base (1), and the outer side of the fixed racks (5) is connected to one side of the limiting mechanism, and the interior of the limiting mechanism includes a placement groove (8) opened at the center position of the inside of the moving plate (3), and a group of connecting gear rings (6) are rotatably arranged inside the placement groove (8), and three groups of rotating gears (9) are arranged inside the connecting gear ring (6), and a group of rotating grooves (10) are opened at the top of the rotating gears (9), and a group of clamping rods (11) that can limit the air flow meter body (31) are fitted inside the rotating grooves (10); Four groups of support rods (13) are fixed at the right side of the base (1), a group of fixed plates (14) are fixed at the top of the support rods (13), a group of second electric push rods (22) are fixed at the bottom right side of the fixed plate (14), the output end of the second electric push rod (22) is fixed at the top of the guide plate (23), and two groups of multi-directional air blowing mechanisms are rotatably arranged at the bottom of the guide plate (23).

2. A flow meter measurement accuracy testing device according to claim 1, characterized in that: The outer side of the fixed rack (5) is meshed with an end of the connecting gear ring (6) extending outward from the movable plate (3), and a group of inner gear rings (7) are fixed to the inner side of the connecting gear ring (6), and the inner side of the inner gear ring (7) is meshed with the outer side of the rotating gear (9).

3. A flow meter measurement accuracy testing device according to claim 2, characterized in that: The rotating groove (10) opened at the top of the rotating gear (9) is inclined, the outer side of the clamping rod (11) is slidably set at the inner position of the rotating groove (10), the top position of the clamping rod (11) extends out of the top position of the moving plate (3) through the sliding groove (12) opened at the top of the moving plate (3), and the moving directions of the three groups of clamping rods (11) are relatively set.

4. A flow meter measurement accuracy testing device according to claim 1, characterized in that: A set of meters (15) capable of displaying voltage values ​​and capacity is fixed at the top center of the fixed disk (14); two sets of movable electrode sheets are connected to the bottom of the meters (15); a set of support plates (16) are fixed at the front and rear positions of the right side of the base (1); a set of first electric push rods (18) are fixed at the top position of the support plates (16); the output ends of the first electric push rods (18) are fixed to one side of a fixed block (19); the top position of the fixed block (19) is fixed to the bottom position of the bonding disk (20); and the bottom of the fixed block (19) is slidably arranged on the outer wall of a guide block (21) fixed to one side of the support plate (16).

5. The flow meter measurement accuracy testing device according to claim 1, characterized in that: The outer side of the guide plate (23) is slidably arranged at an outer side of the support rod (13), and the maximum moving range of the guide plate (23) through the second electric push rod (22) is smaller than the distance from the bottom end of the fan (25) to the top surface position of the base (1).

6. A flow meter measurement accuracy testing device according to claim 1, characterized in that: The multi-directional air blowing mechanism comprises a double-shaft motor (24) arranged at a position below the guide plate (23); the front output end position of the double-shaft motor (24) is fixed to one side of the fan (25) through a shaft coupling; the rear output end position of the double-shaft motor (24) is fixed to the end position of a worm (26); the outer position of the worm (26) is meshedly connected to the outer side of the worm wheel of the gear set (27); the upper position of the gear set (27) is meshedly connected to the outer side of the connecting gear (28); a group of cams (29) are fixed at the top center position of the connecting gear (28); the outer position of the cam (29) is rotatably connected to the outer side of the support frame (30).

7. A flow meter measurement accuracy testing device according to claim 6, characterized in that: The top position of the support frame (30) is connected to the bottom position of the guide plate (23) via a bearing, and the swinging speeds of the two sets of multi-directional air blowing mechanisms are set to be consistent.

8. A flow meter measurement accuracy testing device according to claim 6, characterized in that: The gear set (27) includes a worm gear and a gear inside, the outer side of the gear is meshedly connected to the outer side of the connecting gear (28), and the center axis end position of the gear set (27) is rotatably connected to the inner position of the support frame (30).

9. A flow meter measurement accuracy testing device according to claim 6, characterized in that: The outer side of the cam (29) is rotatably connected to a group of rods on the outer side of the support frame (30), the rods on the outer side of the support frame (30) are rotatably arranged at the bottom position of the guide plate (23), and the dual-axis motor (24) forms a rotating structure between the support frame (30) and the bottom position of the guide plate (23).

10. The test method of a flow meter measurement accuracy test device according to claim 1, characterized in that: The following steps are involved: S1: The air flow meter body (31) is placed at the top of the movable plate (3), and the movable plate (3) is pushed so that the movable plate (3) slides on the outer side of the guide rail (2), so that the connecting toothed ring (6) rotatably connected to the inner side of the movable plate (3) rotates through the fixed rack (5), so that the connecting toothed ring (6) drives the inner toothed ring (7) to rotate together; S2: The internal gear ring (7) rotates to drive the meshingly connected rotating gear (9) to rotate, and the rotating gear (9) rotates stably inside the movable plate (3). The rotating gear (9) drives the rotating groove (10) to rotate and drives the clamping rod (11) to slide in the sliding groove (12) provided on the movable plate (3), thereby achieving the limit processing of the air flow meter body (31); S3: The fixed block (19) and the fitting plate (20) are driven to move by the first electric push rod (18), so that the fitting plate (20) is fitted to the outside of the air flow meter body (31), thereby achieving the purpose of limiting the side wall of the air flow meter body (31); S4: Using the electrode sheet provided on the meter (15) to detect the output voltage of the sensor connected to the conductive end of the air flow meter body (31), which should be 5V under normal circumstances; if the value is accurate, the detection is completed; if the value is inaccurate, the wind force detection mode is started; S5: The multi-directional air blowing mechanism is activated to blow air at different angles on the outside of the air flow meter body (31). At this time, the voltage is observed to change normally with the amount of air inlet through the display element (4), indicating that the air flow meter body (31) is working normally. If the voltage remains unchanged or changes slightly, it indicates that there is a fault in the air flow meter body (31), thereby facilitating the meter (15) to perform capacity measurement.

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