A calibration device for wind speed measuring instrument

Abstract

The invention relates to a calibration device for an anemometer, belonging to the technical field of anemometer calibration; the device comprises a calibration tube, at the openings at both ends of the calibration tube are respectively provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is connected to a ventilator; a calibration port is provided at the center of the bottom plate of the calibration tube, a calibration box is provided outside the calibration port, a standard instrument fixing plate and a measuring instrument fixing plate are provided at the calibration port through a sliding mechanism, and the lifting and lowering of the standard instrument fixing plate and the measuring instrument fixing plate when sliding back and forth are realized through the sliding mechanism; two closing plates are provided at the calibration port through a connecting rod mechanism, and the opening and closing of the two closing plates are realized through the connecting rod mechanism; a driving mechanism is provided inside the calibration box, the driving mechanism is connected with the sliding mechanism and the connecting rod mechanism, and the synchronous action of the connecting rod mechanism and the sliding mechanism is realized through the driving mechanism; the problem of low efficiency and poor accuracy in replacing the standard instrument with the anemometer during the current anemometer calibration is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind speed measuring instrument calibration, and in particular relates to a calibration device for a wind speed measuring instrument. Background Art

[0002] After the anemometer is manufactured, it is necessary to calibrate the anemometer because there may be a certain error value when measuring wind speed. The calibration method is to place the anemometer and the standard instrument in the same measurement environment and compare the difference in the measured values ​​between the anemometer and the standard instrument. The anemometer needs to be compared multiple times under different wind speed conditions to complete the calibration of the anemometer. In order to ensure the accuracy of the calibration results of the anemometer, it is necessary to replace the anemometer and the standard instrument multiple times to ensure that the anemometer and the standard instrument are always in the same test position, thereby ensuring the accuracy of the calibration results. The existing method is to manually replace the standard instrument with the anemometer, which is not only inefficient, but may also cause the test positions of the two to be misaligned, thereby affecting the accuracy of the calibration results. Summary of the invention

[0003] The invention overcomes the shortcomings of the prior art and provides a calibration device for an anemometer, thereby solving the problems of low efficiency and poor accuracy in replacing a standard instrument with an anemometer during the calibration of an anemometer.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0005] A calibration device for an anemometer comprises a calibration tube, wherein an air inlet pipe and an air outlet pipe are respectively arranged at the openings at both ends of the calibration tube, and the air inlet pipe is connected to a ventilator; a calibration port is arranged at the center of the bottom plate of the calibration tube, and a calibration box is fixedly arranged outside the calibration port, and a standard instrument fixing plate and a measuring instrument fixing plate are arranged at the calibration port through a sliding mechanism, and the sliding mechanism is used to realize the lifting and lowering of the standard instrument fixing plate and the measuring instrument fixing plate when sliding forward and backward; two closing plates are arranged at the calibration port through a connecting rod mechanism, and the opening and closing of the two closing plates are realized through the connecting rod mechanism; a driving mechanism is arranged inside the calibration box, and the driving mechanism is connected with the sliding mechanism and the connecting rod mechanism, and the synchronous action of the connecting rod mechanism and the sliding mechanism is realized through the driving mechanism.

[0006] Furthermore, the calibration port is a square through hole; the standard instrument fixing plate is located above the front side of the measuring instrument fixing plate, the standard instrument fixing plate is located inside the calibration port, and the measuring instrument fixing plate is located inside the calibration box below the calibration port.

[0007] Furthermore, the sliding mechanism includes a standard instrument lifting rod, a standard instrument cross bar, a measuring instrument lifting rod, and a measuring instrument cross bar; a vertical standard instrument lifting rod is fixedly arranged at the four corners of the lower end surface of the standard instrument fixing plate, and a left and right horizontal standard instrument cross bar is fixedly arranged between the lower ends of the four standard instrument lifting rods; a vertical measuring instrument lifting rod is fixedly arranged at the four corners of the lower end surface of the measuring instrument fixing plate, and a left and right horizontal measuring instrument cross bar is fixedly arranged between the lower ends of the four measuring instrument lifting rods.

[0008] Furthermore, the sliding mechanism also includes a sliding frame and a guide groove frame; the lower end of the sliding frame is slidably arranged on the inner bottom surface of the calibration box along the front-to-back direction; four standard instrument lifting rods and four measuring instrument lifting rods are respectively slidably inserted into the upper end surface of the sliding frame; a guide groove frame is arranged inside the sliding frame, and a first guide groove that passes through the left and right is arranged on the guide groove frame, and the first guide groove includes a front horizontal section, a front inclined section, a middle horizontal section, a rear inclined section, and a rear horizontal section that are connected in sequence; the height of the front horizontal section is equal to that of the rear horizontal section, and the height of the middle horizontal section is higher than that of the front horizontal section and the rear horizontal section; the standard instrument cross bar and the measuring instrument cross bar are both inserted into the first guide groove, wherein the standard instrument cross bar is located in the inner middle of the middle horizontal section, and the measuring instrument cross bar is located at the inner rear end of the rear horizontal section.

[0009] Furthermore, two front-to-back symmetrical closing plates are arranged inside the calibration port, and the outer side surfaces of the two closing plates are in contact with the inner wall of the calibration port; an avoidance groove is respectively arranged in the middle of the end surface on one side where the two closing plates contact each other, and the standard instrument fixing plate is located inside the avoidance groove of the two closing plates.

[0010] Furthermore, the connecting rod mechanism includes four groups of connecting rod assemblies, one group of connecting rod assemblies is respectively arranged at the left and right edges of the lower end surfaces of the front and rear closing plates; two groups of left-right symmetrical connecting rod assemblies are located on the left and right sides of the sliding frame; the connecting rod assembly includes a swing rod, a first connecting rod, a second connecting rod, and a third connecting rod;

[0011] The upper end of the first connecting rod is hinged to one end of the lower end surface of the closing plate close to another closing plate, and the lower end of the first connecting rod is hinged to the inner wall of the inspection box; the second connecting rod is a bent rod-shaped structure, including a first rod segment, a second rod segment, and a third rod segment fixedly connected in sequence, a first hinge hole is provided at one end of the first rod segment away from the second rod segment, a second hinge hole is provided at one end of the third rod segment away from the second rod segment, and a third hinge hole is provided at the connection between the second rod segment and the third rod segment; the first hinge hole is hinged to the middle part of the lower end surface of the closing plate, the third hinge hole is hinged to the inner wall of the inspection box, and the line between the first hinge hole and the third hinge hole is parallel to the first connecting rod and has the same length; one end of the third connecting rod is hinged to the second hinge hole of the second connecting rod; one end of the swing rod is fixedly arranged on the rotating disk, and the other end of the swing rod is hinged to one end of the third connecting rod away from the second connecting rod.

[0012] Furthermore, the rocker arms of the front and rear connecting rod assemblies on the left and right sides are fixed on the same rotating disk, and the left and right rotating disks are respectively rotatably arranged on the left and right inner walls of the calibration box through rotating shafts, and the same left and right horizontal transmission rods are arranged at the lower ends of the two rotating disks, and the transmission rods are rotatably arranged on the inner bottom surface of the calibration box through hinged seats; the two ends of the transmission rods are respectively connected to the rotating shafts of the two rotating disks through a set of synchronous belt transmission mechanisms.

[0013] Furthermore, the driving mechanism includes an electric push rod, a fixed rod, a transverse sliding frame, and a longitudinal sliding plate; an electric push rod is fixedly arranged at the inner bottom surface of the calibration box, the piston rod of the electric push rod is horizontally forward, and the piston rod of the electric push rod is in a retracted state; a sliding groove is arranged on the left inner wall of the calibration box, and a transverse sliding frame is arranged inside the sliding groove for sliding along the front-to-back direction, and the transverse sliding frame is located at the inner rear end of the sliding groove; a longitudinal sliding plate is arranged on the right end surface of the transverse sliding frame for sliding along the vertical direction; an action groove is arranged on the side wall on the left side of the sliding frame, and an L-shaped fixed rod is fixedly arranged at the end of the piston rod of the electric push rod, the horizontal section of the fixed rod passes through the action groove of the sliding frame, and the upper end of the vertical section of the fixed rod is fixedly connected to the lower end of the transverse sliding frame.

[0014] Furthermore, the driving mechanism also includes a second guide groove, which is located on the inner wall of the sliding groove, and the second guide groove includes an upper horizontal section, a middle inclined section, and a lower horizontal section connected in sequence, the upper horizontal section is located on the upper and rear side of the lower horizontal section, and a shift rod is fixedly arranged on the inner side surface of the longitudinal sliding plate, the shift rod passes through the transverse sliding frame and is inserted into the second guide groove, and the end of the shift rod away from the longitudinal sliding plate is located at the inner rear end of the upper horizontal section of the second guide groove; an upper actuating rod and a lower actuating rod are respectively fixedly arranged at the upper and lower side edges of the outer end surface of the longitudinal sliding plate, an upper rack is fixedly arranged at the rear end of the lower end surface of the upper actuating rod, and a lower rack is fixedly arranged at the front end of the upper end surface of the lower actuating rod; a gear is fixedly arranged at the left end of the transmission rod, the gear is located between the upper actuating rod and the lower actuating rod, and the front end of the lower rack is in a preliminary meshing state with the gear, and the upper rack is located on the upper rear side of the gear.

[0015] Furthermore, two sliding blocks are provided inside the action groove to slide along the front-back direction; a front-back horizontal guide rod is fixedly provided at the center of the end surface of the two sliding blocks away from each other, a guide hole is provided on the inner wall of the front and back sides of the action groove, and the two guide rods are slidably inserted into the guide hole on the same side; a spring is sleeved on the outer side of the two guide rods, and the two ends of the spring are fixedly connected to the sliding block on the same side and the inner wall of the action groove; the horizontal section of the fixed rod is located between the two sliding blocks. At this time, the horizontal section of the fixed rod is in contact with the front end surface of the rear sliding block, the rear spring is in a compressed state, and the front spring is in a free extension state.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] (1) The present invention provides a calibration device for an anemometer, which realizes the front-to-back displacement of a standard instrument fixing plate and a measuring instrument fixing plate by extending and retracting an electric push rod, and can ensure that the anemometer is completely inserted into the calibration box when the standard instrument is measuring wind speed through a sliding mechanism. When the anemometer is measuring wind speed, the standard instrument is completely inserted into the calibration box, ensuring that the two are in exactly the same test position and that they do not interfere with each other.

[0018] (2) The present invention provides a calibration device for an anemometer. By providing two closing plates and a connecting rod mechanism, it can ensure that the calibration port of a standard instrument or anemometer is always in a closed state when detecting wind speed, and no air leakage occurs from the calibration port, thereby ensuring the accuracy of the calibration result.

[0019] (3) The present invention provides a calibration device for an anemometer. By setting a driving mechanism, the movement of a sliding mechanism and a connecting rod mechanism can be realized through an electric push rod, and the movement timing of the two closing plates is completely staggered with the movement timing of the measuring instrument fixing plate and the standard instrument fixing plate, thereby ensuring that the two will not interfere with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings:

[0021] Figure 1 It is a three-dimensional schematic diagram of the present invention as a whole;

[0022] Figure 2 is a side view of the present invention when the piston rod of the electric push rod is in a fully retracted state;

[0023] Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0024] Figure 4 It is a side view of the present invention when the piston rod of the electric push rod is extended outward to the front end of the upper rack and is in a preliminary meshing state with the gear;

[0025] Figure 5 yes Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0026] Figure 6 This is a schematic diagram of the internal structure of the half-cut calibration box when the piston rod of the electric push rod is in the fully retracted state;

[0027] Figure 7 It is a schematic diagram of the internal structure of the half-sectioned calibration box when the piston rod of the electric push rod extends outward to the front end of the upper rack and is in a preliminary meshing state with the gear;

[0028] Figure 8 It is a side view of the internal structure of the half-sectioned calibration box when the piston rod of the electric push rod is in the fully retracted state;

[0029] Fig. 9 It is a side view of the internal structure of the half-sectioned calibration box when the piston rod of the electric push rod extends outward to the front end of the upper rack and is in a preliminary meshing state with the gear;

[0030] Fig.10 It is a schematic diagram of the connecting rod mechanism inside the half-cut calibration box when the piston rod of the electric push rod is in the fully retracted state;

[0031] Fig.11 It is a schematic diagram of the connecting rod mechanism inside the half-cut calibration box when the piston rod of the electric push rod extends outward to the front end of the upper rack and is in a preliminary meshing state with the gear;

[0032] Fig.12 It is a structural diagram of the sliding mechanism inside the half-cut calibration box when the piston rod of the electric push rod is in the fully retracted state;

[0033] Fig.13 It is a structural diagram of the sliding mechanism inside the half-cut calibration box when the piston rod of the electric push rod is in the fully extended state;

[0034] Fig.14 yes Fig.12 A schematic diagram of the structure of the sliding frame after being half-cut;

[0035] Fig.15 yes Fig.13 A schematic diagram of the structure of the sliding frame after being half-cut;

[0036] Fig.16 It is a schematic diagram of the relative relationship between the piston rod of the electric push rod and the sliding frame when the piston rod is in a fully retracted state;

[0037] Fig.17 yes Fig.16 A partial enlarged schematic diagram of point C in the middle;

[0038] Fig.18 It is a schematic diagram of the relative relationship between the piston rod of the electric push rod and the sliding frame when the piston rod is in a fully extended state;

[0039] Fig.19 yes Fig.18 A partial enlarged schematic diagram of point D in the middle;

[0040] Fig. 20 It is a schematic diagram of the relative relationship between the lower rack and the gear when the piston rod of the electric push rod is in a fully retracted state;

[0041] Fig.21 It is a schematic diagram of the relative relationship between the upper rack and the gear when the piston rod of the electric push rod is in the fully extended state;

[0042] Fig. 22 It is a schematic diagram of the relative relationship between the lower rack and gear, the lateral sliding block, and the longitudinal sliding plate when the piston rod of the electric push rod is in a fully retracted state;

[0043] Fig.23 It is a schematic diagram of the relative relationship between the upper rack and gear, the transverse sliding block, and the longitudinal sliding plate when the piston rod of the electric push rod is in a fully extended state;

[0044] Fig.24 It is a schematic diagram of the relative relationship between the electric push rod, the transverse sliding frame, and the longitudinal sliding plate when the piston rod of the electric push rod is in a fully retracted state;

[0045] Fig.25It is a schematic diagram of the relative relationship between the electric push rod, the transverse sliding frame, and the longitudinal sliding plate when the piston rod of the electric push rod is in a fully extended state;

[0046] Fig.26 It is a structural schematic diagram of the guide slot frame;

[0047] Among them, 1 is the calibration tube, 2 is the air inlet pipe, 3 is the air outlet pipe, 4 is the calibration port, 5 is the calibration box, 6 is the standard instrument fixing plate, 7 is the measuring instrument fixing plate, 8 is the closing plate, 9 is the operating door, 10 is the observation window, 11 is the inspection door, 12 is the standard instrument lifting rod, 13 is the standard instrument cross bar, 14 is the measuring instrument lifting rod, 15 is the measuring instrument cross bar, 16 is the sliding frame, 17 is the guide sleeve, 18 is the guide groove frame, 19 is the first guide groove, 20 is the front horizontal section, 21 is the front inclined section, 22 is the middle horizontal section, 23 is the rear inclined section, 24 is the rear horizontal section, 25 is the first connecting rod, 26 is The second connecting rod, 27 is the third connecting rod, 28 is the rocker arm, 29 is the rotating disk, 30 is the transmission rod, 31 is the synchronous belt transmission mechanism, 32 is the avoidance groove, 33 is the electric push rod, 34 is the sliding groove, 35 is the horizontal sliding frame, 36 is the longitudinal sliding plate, 37 is the second guide groove, 38 is the upper horizontal section, 39 is the middle inclined section, 40 is the lower horizontal section, 41 is the shifting rod, 42 is the action groove, 43 is the fixed rod, 44 is the upper action rod, 45 is the upper rack, 46 is the lower action rod, 47 is the lower rack, 48 is the gear, 49 is the sliding block, 50 is the guide rod, and 51 is the spring. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0049] like Figure 1As shown in FIG. 26 , the present invention provides a calibration device for an anemometer, comprising a calibration tube 1, wherein an air inlet pipe 2 and an air outlet pipe 3 are respectively arranged at the openings at both ends of the calibration tube 1, and the air inlet pipe 2 is connected to the ventilator; a calibration port 4 is arranged at the center of the bottom plate of the calibration tube 1, and a calibration box 5 is fixedly arranged on the outer side of the calibration port 4, and a standard instrument fixing plate 6 and a measuring instrument fixing plate 7 are arranged at the calibration port 4 through a sliding mechanism, and the lifting and lowering of the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 when sliding back and forth are realized through the sliding mechanism; two closing plates 8 are arranged at the calibration port 4 through a connecting rod mechanism, and the opening and closing of the two closing plates 8 are realized through the connecting rod mechanism; a driving mechanism is arranged inside the calibration box 5, and the driving mechanism is connected with the sliding mechanism and the connecting rod mechanism, and the synchronous action of the connecting rod mechanism and the sliding mechanism is realized through the driving mechanism.

[0050] The test tube 1 is a horizontally arranged square tubular structure. The test tube 1 is arranged horizontally along the front-back direction, and both ends of the test tube 1 remain open. An openable operating door 9 is arranged at the center of the top plate of the test tube 1, and the inside of the test tube 1 can be operated by opening the operating door 9. A transparent observation window 10 is arranged on the side walls on the left and right sides of the test tube 1, respectively, through which the components inside the test tube 1 can be observed.

[0051] The inspection port 4 is a square through hole. The inspection box 5 is a square box structure with an upper opening, the upper opening of the inspection box 5 is fixedly connected to the lower end surface of the inspection tube 1, and the inspection port 4 is located inside the upper opening of the inspection box 5. An openable inspection door 11 is provided on the side wall on the right side of the inspection box 5, and the components inside the inspection box 5 can be inspected by opening the inspection door 11.

[0052] The standard instrument fixing plate 6 and the measuring instrument fixing plate 7 are both horizontally arranged square plate structures, wherein the standard instrument fixing plate 6 is located above the front side of the measuring instrument fixing plate 7, and the standard instrument fixing plate 6 is located inside the calibration port 4, and the measuring instrument fixing plate 7 is located inside the calibration box 5 below the calibration port 4.

[0053] The sliding mechanism includes a standard instrument lifting rod 12 , a standard instrument cross bar 13 , a measuring instrument lifting rod 14 , a measuring instrument cross bar 15 , a sliding frame 16 , and a guide groove frame 18 .

[0054] A vertical standard instrument lifting rod 12 is fixedly installed at the four corners of the lower end surface of the standard instrument fixing plate 6, a standard instrument connecting rod is fixedly installed between the lower ends of the two standard instrument lifting rods 12 on the left, a standard instrument connecting rod is fixedly installed between the lower ends of the two standard instrument lifting rods 12 on the right, a standard instrument cross bar 13 is fixedly installed between the middle parts of the two standard instrument connecting rods, and the standard instrument cross bar 13 is horizontally arranged along the left and right directions.

[0055] A vertical measuring instrument lifting rod 14 is fixedly installed at the four corners of the lower end surface of the measuring instrument fixing plate 7, a measuring instrument connecting rod is fixedly installed between the lower ends of the two measuring instrument lifting rods 14 on the left, a measuring instrument connecting rod is fixedly installed between the lower ends of the two measuring instrument lifting rods 14 on the right, a measuring instrument cross bar 15 is fixedly installed between the middle parts of the two measuring instrument connecting rods, and the measuring instrument cross bar 15 is horizontally installed along the left and right directions.

[0056] The sliding frame 16 is a U-shaped plate-like structure with an opening facing downward, and the sliding frame 16 extends horizontally along the front-to-back direction. Two groups of lifting holes are respectively provided on the upper end surface of the sliding frame 16, and each group of lifting holes includes four lifting holes in a square array, and a guide sleeve 17 is fixedly inserted inside each lifting hole. The four standard instrument lifting rods 12 are respectively slidably inserted into the guide sleeves 17 of the four lifting holes on the front side, and the four measuring instrument lifting rods 14 are respectively slidably inserted into the guide sleeves 17 of the four lifting holes on the rear side. A first slider extending horizontally forward and backward is fixedly provided at both ends of the lower side of the sliding frame 16, and two left-right symmetrical first slide grooves are provided on the inner bottom surface of the calibration box 5. The first slide grooves extend horizontally along the front-to-back direction, and the two first sliders are respectively slidably inserted into the two first slide grooves, so that the sliding frame 16 slides horizontally along the front-to-back direction inside the calibration box 5.

[0057] A guide slot frame 18 is arranged inside the sliding frame 16, and the guide slot frame 18 is fixedly arranged at the inner bottom surface of the inspection box 5, and the guide slot frame 18 is located in a vertical plane in the front-to-back direction. A first guide slot 19 is arranged on the guide slot frame 18, and the first guide slot 19 includes a front horizontal section 20, a front inclined section 21, a middle horizontal section 22, a rear inclined section 23, and a rear horizontal section 24; the front horizontal section 20, the middle horizontal section 22, and the rear horizontal section 24 are all arranged horizontally along the front-to-back direction, wherein the height of the front horizontal section 20 is equal to that of the rear horizontal section 24, and the height of the middle horizontal section 22 is higher than that of the front horizontal section 20 and the rear horizontal section 24; the front and rear ends of the front inclined section 21 are respectively connected to the rear end of the front horizontal section 20 and the front end of the middle horizontal section 22; the front and rear ends of the rear inclined section 23 are respectively connected to the rear end of the middle horizontal section 22 and the front end of the rear horizontal section 24; all the connections maintain a smooth transition connection.

[0058] The standard instrument cross bar 13 and the measuring instrument cross bar 15 are both inserted into the first guide groove 19, wherein the standard instrument cross bar 13 is located at the inner middle of the middle horizontal section 22, and the measuring instrument cross bar 15 is located at the inner rear end of the rear horizontal section 24. The outer side surfaces of the standard instrument cross bar 13 and the measuring instrument cross bar 15 are in sliding contact with the upper and lower inner walls of the first guide groove 19.

[0059] When the sliding frame 16 slides forward driven by the driving mechanism, the sliding frame 16 drives the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 to slide forward respectively through the standard instrument lifting rod 12 and the measuring instrument lifting rod 14. In the process of the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 sliding forward, the standard instrument cross bar 13 and the measuring instrument cross bar 15 also slide forward. The standard instrument cross bar 13 slides out from the middle horizontal section 22 of the first guide groove 19 and slides to the front end of the front horizontal section 20 after passing through the front inclined section 21; the measuring instrument cross bar 15 slides out from the rear horizontal section 24 of the first guide groove 19 and slides to the inner middle of the middle horizontal section 22 after passing through the rear inclined section 23. In the process of the standard instrument cross bar 13 sliding forward, it continuously descends, so that the standard instrument fixing plate 6 also descends; in the process of the measuring instrument cross bar 15 sliding forward, it continuously rises, so that the measuring instrument fixing plate 7 also rises. Finally, the standard instrument fixing plate 6 continuously descends to the inside of the calibration box 5 while sliding forward, and the measuring instrument fixing plate 7 continuously rises to the inside of the calibration port 4 while sliding forward. At this time, the measuring instrument fixing plate 7 moves to the initial position of the standard instrument fixing plate 6.

[0060] When the sliding frame 16 slides backward again driven by the driving mechanism, the sliding frame 16 drives the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 to slide backward respectively through the standard instrument lifting rod 12 and the measuring instrument lifting rod 14, and the standard instrument cross bar 13 and the measuring instrument cross bar 15 slide along the opposite path inside the first guide groove 19, so that the standard instrument fixing plate 6 continues to rise during the backward sliding process until it returns to the calibration port 4, and the measuring instrument fixing plate 7 continues to descend during the backward sliding process until it returns to the calibration box 5, at which time the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 return to their initial positions.

[0061] Two front-to-back symmetrical closing plates 8 are arranged inside the inspection port 4. Both closing plates 8 are horizontally arranged square plate-shaped structures. The two closing plates 8 are in contact with each other, and the outer side surfaces of the two closing plates 8 are in contact with the inner wall of the inspection port 4. An avoidance groove is respectively arranged in the middle of the end surface of one side where the two closing plates 8 are in contact with each other. The standard instrument fixing plate 6 is located inside the avoidance groove of the two closing plates 8, and the outer side surface of the standard instrument fixing plate 6 is in contact with the inner wall of the avoidance groove of the two closing plates 8.

[0062] The connecting rod mechanism includes four groups of connecting rod assemblies, wherein two groups of symmetrical connecting rod assemblies are arranged at the left and right edges of the lower end surface of the front closing plate 8, and two groups of symmetrical connecting rod assemblies are arranged at the left and right edges of the lower end surface of the rear closing plate 8. The two groups of symmetrical connecting rod assemblies are located on the left and right sides of the sliding frame 16.

[0063] The connecting rod assembly includes a swing rod 28 , a first connecting rod 25 , a second connecting rod 26 , and a third connecting rod 27 .

[0064] The first connecting rod 25 is a linear rod structure, the upper end of the first connecting rod 25 is hinged to one end of the lower end surface of the closing plate 8 close to another closing plate 8, and the lower end of the first connecting rod 25 is hinged to the inner wall of the verification box 5.

[0065] The second connecting rod 26 is a curved rod-shaped structure, including a first rod segment, a second rod segment, and a third rod segment fixedly connected in sequence, a first hinge hole is provided at one end of the first rod segment away from the second rod segment, a second hinge hole is provided at one end of the third rod segment away from the second rod segment, and a third hinge hole is provided at the connection between the second rod segment and the third rod segment; the first hinge hole is hinged to the middle part of the lower end surface of the closing plate 8, the third hinge hole is hinged to the inner wall of the inspection box 5, and the connecting line between the first hinge hole and the third hinge hole is parallel to the first connecting rod 25 and has the same length.

[0066] The third connecting rod 27 is a linear rod structure, and one end of the third connecting rod 27 is hinged to the second hinge hole of the second connecting rod 26 .

[0067] The swing rod 28 is a linear rod structure, one end of the swing rod 28 is fixedly disposed on the rotating disk 29 , and the other end of the swing rod 28 is hinged to an end of the third connecting rod 27 away from the second connecting rod 26 .

[0068] The rocker arms 28 of the front and rear connecting rod assemblies on the left side are fixed on the same rotating disk 29, and the rocker arms 28 of the front and rear connecting rod assemblies on the right side are fixed on the same rotating disk 29. The left and right rotating disks 29 are respectively rotatably arranged on the left and right inner walls of the inspection box 5 through rotating shafts, and the two rotating disks 29 are both located in the vertical plane between the front and rear closing plates 8.

[0069] The same transmission rod 30 is arranged at the lower end of the two rotating disks 29, and the transmission rod 30 is arranged horizontally along the left-right direction. The transmission rod 30 is rotatably arranged on the inner bottom surface of the inspection box 5 through a hinge seat. The two ends of the transmission rod 30 are respectively connected to the rotating shafts of the two rotating disks 29 through a set of synchronous belt transmission mechanisms 31. A driven pulley is fixedly sleeved on the rotating shafts of the two rotating disks 29, and a driving pulley is fixedly arranged at the two ends of the transmission rod 30. The driving pulley is located below the driven pulley on the same side, and a synchronous belt is arranged between the driving pulley and the driven pulley on the same side. The transmission rod 30 drives the driving pulleys on both sides to rotate synchronously, and the driving pulley drives the driven pulley above to rotate through the synchronous belt, and the driven pulley drives the rotating disk 29 on the same side to rotate.

[0070] When the two rotating disks 29 rotate synchronously, the rotating disks 29 drive the two outer swing rods 28 to rotate synchronously, and the swing rod 28 drives the second connecting rod 26 to rotate through the third connecting rod 27, and the second connecting rod 26 drives the closing plate 8 to rotate. The two closing plates 8 rotate upward and away from each other until the two closing plates 8 move to both sides of the upper end of the inspection port 4, and the inspection port 4 is exposed. Since the connecting line between the first hinge hole and the third hinge hole is parallel to the first connecting rod 25 and has the same length, it is ensured that the closing plate 8 always remains horizontal when moving.

[0071] When the two rotating disks 29 rotate synchronously in opposite directions, the above steps are reversed so that the two closing plates 8 return to the inside of the inspection port 4 and the two closing plates 8 contact the standard instrument fixing plate 6, so that the inspection port 4 is closed.

[0072] A horizontal avoidance groove 32 is respectively provided on the left and right side walls of the sliding frame 16, and the transmission rod 30 is slidably inserted into the two avoidance grooves 32. When the sliding frame 16 slides forward and backward, the transmission rod 30 slides relatively in the avoidance groove 32 to ensure that the forward and backward sliding of the sliding frame 16 will not interfere with the transmission rod 30.

[0073] The driving mechanism includes an electric push rod 33 , a fixed rod 43 , a transverse sliding frame 35 , a longitudinal sliding plate 36 , a gear 48 , a second guide groove 37 , a sliding block 49 , and a spring 51 .

[0074] An electric push rod 33 is fixedly provided at the inner bottom surface of the calibration box 5 . The electric push rod 33 is located inside the sliding frame 16 . The piston rod of the electric push rod 33 is horizontally forward and in a retracted state.

[0075] A sliding groove 34 is provided on the left inner wall of the calibration box 5, and the sliding groove 34 is a horizontally arranged square groove-shaped structure. A transverse sliding frame 35 is slidably provided inside the sliding groove 34, and the transverse sliding frame 35 is a square frame structure. The transverse sliding frame 35 is located in a vertical plane in the front-to-back direction, and the transverse sliding frame 35 is located at the inner rear end of the sliding groove 34. A second sliding groove extending horizontally forward and backward is respectively provided inside the upper and lower side end surfaces of the sliding groove 34, and a second sliding block is fixedly provided on the upper and lower side end surfaces of the transverse sliding frame 35, and the two second sliding blocks are respectively slidably inserted into the two second sliding grooves, so that the transverse sliding frame 35 slides horizontally forward and backward inside the sliding groove 34.

[0076] A vertical third slide groove is respectively provided at the front and rear edges of the right side end surface of the transverse sliding frame 35. A longitudinal sliding plate 36 is respectively provided between the two third slide grooves, and a third slider is respectively provided at the front and rear ends of the longitudinal sliding plate 36. The two third sliders are respectively slidably connected to the inside of the two third slide grooves, so that the longitudinal sliding plate 36 slides vertically on the transverse sliding frame 35.

[0077] A second guide groove 37 is provided on the inner wall of the sliding groove 34. The second guide groove 37 includes an upper horizontal section 38, a middle inclined section 39, and a lower horizontal section 40. The upper horizontal section 38 and the lower horizontal section 40 are both arranged horizontally along the front-to-back direction, and the upper horizontal section 38 is located at the upper rear side of the lower horizontal section 40. The front and rear ends of the middle inclined section 39 are respectively connected to the rear end of the lower horizontal section 40 and the front end of the upper horizontal section 38. A lever 41 is fixedly provided on the inner side of the longitudinal sliding plate 36. The lever 41 passes through the transverse sliding frame 35 and is inserted into the second guide groove 37. The end of the lever 41 away from the longitudinal sliding plate 36 is located at the inner rear end of the upper horizontal section 38 of the second guide groove 37.

[0078] A left-right through-action groove 42 is provided on the side wall of the left side of the sliding frame 16, and the action groove 42 is arranged horizontally along the front-back direction. An L-shaped fixing rod 43 is fixedly arranged at the piston rod end of the electric push rod 33, and the fixing rod 43 includes a vertical section and a horizontal section. The horizontal section is arranged horizontally along the left-right direction, and the horizontal section passes through the action groove 42 of the sliding frame 16, one end of the horizontal section is fixedly connected to the piston rod end of the electric push rod 33, the other end of the horizontal section is fixedly connected to the lower end of the vertical section, and the upper end of the vertical section is fixedly connected to the lower end of the horizontal sliding frame 35. The front-back sliding of the horizontal sliding frame 35 in the sliding groove 34 is realized by the extension and retraction of the piston rod of the electric push rod 33.

[0079] An upper acting rod 44 and a lower acting rod 46 are fixedly arranged at the upper and lower edges of the outer side end surface of the longitudinal sliding plate 36, and both the upper acting rod 44 and the lower acting rod 46 are arranged horizontally along the front-back direction. An upper rack 45 is fixedly arranged at the rear end of the lower end surface of the upper acting rod 44, and a lower rack 47 is fixedly arranged at the front end of the upper end surface of the lower acting rod 46. A gear 48 is fixedly arranged at the left end of the transmission rod 30, and the gear 48 is located between the upper acting rod 44 and the lower acting rod 46, and the front end of the lower rack 47 is in a preliminary meshing state with the gear 48, and the upper rack 45 is located above and behind the gear 48.

[0080] A third horizontal sliding groove is respectively arranged on the upper and lower end surfaces inside the action groove 42, and two sliding blocks 49 are slidably arranged inside the action groove 42. A third sliding block is respectively fixedly arranged on the upper and lower end surfaces of each sliding block 49, and the upper and lower sliding blocks are respectively slidably inserted in the two third sliding grooves, so that the two sliding blocks 49 slide forward and backward inside the action groove 42. A front-to-back horizontal guide rod 50 is respectively fixedly arranged at the center of the end surface of the side away from each other of the two sliding blocks 49, and a front-to-back horizontal guide hole is respectively arranged on the front and rear inner walls of the action groove 42, and the two guide rods 50 are respectively slidably inserted in the guide holes on the same side. A spring 51 is respectively sleeved on the outer side of the two guide rods 50, and the two ends of the spring 51 are respectively fixedly connected to the sliding block 49 on the same side and the inner wall of the action groove 42.

[0081] The horizontal section of the fixed rod 43 is located between the two sliding blocks 49. At this time, the horizontal section of the fixed rod 43 contacts the front end surface of the sliding block 49 on the rear side, the spring 51 on the rear side is in a compressed state, and the spring 51 on the front side is in a free extension state.

[0082] The working principle of the present invention is:

[0083] Phase 1:

[0084] In the initial state, the piston rod of the electric push rod 33 is in a retracted state, the standard instrument fixing plate 6 is located in the inner middle part of the calibration port 4, the two closing plates 8 are inside the calibration port 4 and close the calibration port 4, the measuring instrument fixing plate 7 is located inside the calibration box 5, the standard instrument cross bar 13 is located in the inner middle part of the middle horizontal section 22 of the first guide groove 19, the measuring instrument cross bar 15 is located at the inner rear end of the rear horizontal section 24 of the first guide groove 19, the front end of the lower rack 47 is in a preliminary meshing state with the gear 48, the horizontal section of the fixing rod 43 is in contact with the front end surface of the sliding block 49 on the rear side, the spring 51 on the rear side is in a compressed state, and the spring 51 on the front side is in a free extension state.

[0085] At this time, a standard instrument is fixed on the upper end surface of the standard instrument fixing plate 6, and the measuring position of the standard instrument is located at the axis of the calibration tube 1. The ventilator inputs the airflow from the air inlet pipe 2 into the calibration tube 1, and finally outputs it from the air outlet pipe 3. After the airflow inside the calibration tube 1 passes through the standard instrument, the standard instrument measures the wind speed of the wind flow, thereby obtaining the standard value of the wind speed.

[0086] Phase 2:

[0087] When the anemometer is required to measure the wind speed inside the calibration tube 1, the ventilator is controlled to stop running.

[0088] Then the piston rod of the electric push rod 33 is controlled to extend outward. During the extension of the piston rod of the electric push rod 33, the piston rod of the electric push rod 33 drives the lateral sliding frame 35 to slide forward inside the sliding groove 34 through the fixed rod 43, and the lateral sliding frame 35 drives the longitudinal sliding plate 36 to slide forward. At this time, the lever 41 on the longitudinal sliding plate 36 slides forward inside the upper horizontal section 38 of the second guide groove 37, so that the height of the longitudinal sliding plate 36 remains unchanged during the forward sliding process, so that the height of the upper rack 45 and the lower rack 47 also remains unchanged during the forward sliding process. When the lower rack 47 starts to slide forward, the lower rack 47 starts to drive the gear 48 to rotate, and the gear 48 drives the transmission rod 30 to rotate, and the transmission rod 30 drives the rotating disks 29 on both sides to rotate through the synchronous belt transmission mechanism 31 at both ends. When the two rotating disks 29 rotate synchronously, the rotating disks 29 drive the two outer swing rods 28 to rotate synchronously, and the swing rod 28 drives the second connecting rod 26 to rotate through the third connecting rod 27, and the second connecting rod 26 drives the closing plate 8 to rotate. The two closing plates 8 rotate upward and away from each other until the two closing plates 8 move to both sides of the upper end of the inspection port 4, and the inspection port 4 is exposed. At this time, the connection between the first rod segment and the second rod segment of the second connecting rod 26 of the front connecting rod assembly contacts the front edge of the inspection port 4, and the connection between the first rod segment and the second rod segment of the second connecting rod 26 of the rear connecting rod assembly contacts the rear edge of the inspection port 4, thereby ensuring that the two closing plates 8 and the connecting rod mechanism maintain the current state.

[0089] When the closing plate 8 is fully opened outward, the lower rack 47 has passed the gear 48, the gear 48 no longer rotates, the transmission rod 30, the rotating disk 29, etc. no longer move, and the two closing plates 8 maintain the current position and angle. At this time, the horizontal section of the fixed rod 43 is in contact with the two sliding blocks 49, the front and rear springs 51 are in a free extension state, and the lever 41 on the longitudinal sliding plate 36 enters the middle inclined section 39 from the upper horizontal section 38 of the second guide groove 37.

[0090] Phase 3:

[0091] As the piston rod of the electric push rod 33 continues to extend, the horizontal section of the fixed rod 43 begins to push the sliding block 49 on the front side, and the sliding block 49 on the front side slightly compresses the spring 51 on the front side. The spring 51 on the front side pushes the sliding frame 16 to slide forward as a whole, causing the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 to slide forward, and the standard instrument fixing plate 6 gradually descends, and the measuring instrument fixing plate 7 gradually rises.

[0092] During this process, the piston rod of the electric push rod 33 continues to push the transverse sliding frame 35 to slide forward through the fixed rod 43, and the transverse sliding frame 35 continues to drive the longitudinal sliding plate 36 to slide forward. The lever 41 on the longitudinal sliding plate 36 slides forward inside the middle inclined section 39 of the second guide groove 37, so that the height of the lever 41 gradually decreases, and the lever 41 drives the longitudinal sliding plate 36 to gradually descend inside the transverse sliding frame 35, and the upper rack 45 and the lower rack 47 gradually descend during the forward sliding process.

[0093] When the standard instrument fixing plate 6 slides forward to completely enter the calibration box 5, the standard instrument fixing plate 6 drops to the lowest height. At this time, the standard instrument cross bar 13 is located at the front end of the front horizontal section 20 of the first guide groove 19. The standard instrument cross bar 13 cannot continue to slide forward, so the sliding frame 16 cannot continue to slide forward. At this time, the measuring instrument fixing plate 7 slides forward to enter the calibration port 4, and the measuring instrument cross bar 15 is located in the middle of the inner side of the middle horizontal section 22 of the first guide groove 19. The wind speed measuring instrument is fixed on the measuring instrument fixing plate 7, and the measuring position of the wind speed measuring instrument is located at the axis of the calibration tube 1.

[0094] When the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 slide forward into place, the lever 41 on the longitudinal sliding plate 36 slides to the front end of the middle inclined section 39 of the second guide groove 37, and the upper rack 45 and the lower rack 47 slide forward to the lowest height. At this time, the upper rack 45 is located on the upper rear side of the gear 48 and the front end of the upper rack 45 is in a preliminary meshing state with the gear 48.

[0095] Phase 4:

[0096] As the piston rod of the electric push rod 33 continues to extend, since the sliding frame 16 no longer moves forward, the fixed rod 43 continues to slide forward driven by the electric push rod 33, so that the horizontal section of the fixed rod 43 continues to compress the spring 51 on the front side. At the same time, the fixed rod 43 drives the transverse sliding frame 35 to continue to slide forward inside the sliding groove 34, and the transverse sliding frame 35 continues to drive the longitudinal sliding plate 36 to slide forward. The lever 41 on the longitudinal sliding plate 36 slides forward inside the lower horizontal section 40 of the second guide groove 37, so that the height of the longitudinal sliding plate 36 remains unchanged during the forward sliding process, and the height of the upper rack 45 and the lower rack 47 also remain unchanged during the forward sliding process. The upper rack 45 drives the gear 48 to rotate in the opposite direction during the forward sliding process, and the gear 48 drives the transmission rod 30 to rotate in the opposite direction. The transmission rod 30 drives the two rotating disks 29 to rotate in the opposite direction through the synchronous belt transmission mechanism 31 at both ends, and the rotating disk 29 drives the third connecting rod 27, the second connecting rod 26, and the first connecting rod 25 to move in the opposite direction, so that the two closing plates 8 rotate back to the inside of the inspection port 4 until the two closing plates 8 completely close the inspection port 4.

[0097] At this time, the piston rod of the electric push rod 33 is fully extended, the upper rack 45 completely passes through the gear 48, and the front spring 51 is completely compressed.

[0098] Then the fan is controlled to start again to ensure that the working parameters of the fan remain the same as the previous working parameters. The fan inputs the airflow from the air inlet pipe 2 into the inside of the calibration tube 1, and finally outputs it from the air outlet pipe 3. After the airflow inside the calibration tube 1 passes through the anemometer, the anemometer measures the wind speed of the airflow, thereby obtaining the measurement value of the wind speed by the anemometer. At this time, the measurement value of the anemometer is compared with the measurement value of the standard instrument, so as to obtain the error value of the anemometer at the current wind speed.

[0099] Phase 5:

[0100] Then the piston rod of the electric push rod 33 is controlled to start to retract. First, the piston rod drives the fixed rod 43 to slide backward gradually. The horizontal section of the fixed rod 43 slides backward inside the action groove 42 of the sliding frame 16. The spring 51 on the front side gradually rebounds, and the sliding block 49 on the front side gradually slides backward until the horizontal section of the fixed rod 43 slides backward to the inner middle part of the action groove 42. The horizontal section of the fixed rod 43 keeps in contact with the two sliding blocks 49. During this process, the sliding frame 16 remains stationary.

[0101] During this process, the fixed rod 43 drives the transverse sliding frame 35 to continue to slide backward inside the sliding groove 34, and the transverse sliding frame 35 continues to drive the longitudinal sliding plate 36 to slide backward. The lever 41 on the longitudinal sliding plate 36 slides backward inside the lower horizontal section 40 of the second guide groove 37, so that the height of the longitudinal sliding plate 36 remains unchanged during the backward sliding process, and the height of the upper rack 45 and the lower rack 47 also remain unchanged during the backward sliding process. The upper rack 45 drives the gear 48 to rotate forward during the backward sliding process, and the forward rotating gear 48 drives the two closing plates 8 to move outward through the transmission rod 30, the synchronous belt transmission mechanism 31, and the connecting rod mechanism until the inspection port 4 is completely exposed.

[0102] When the closing plate 8 is fully opened outward, the upper rack 45 has passed the gear 48, the gear 48 no longer rotates, the transmission rod 30, the rotating disk 29, etc. no longer move, and the two closing plates 8 maintain the current position and angle. At this time, the horizontal section of the fixed rod 43 is in contact with the two sliding blocks 49, the front and rear springs 51 are in a free extension state, and the lever 41 on the longitudinal sliding plate 36 enters the interior of the middle inclined section 39 from the lower horizontal section 40 of the second guide groove 37.

[0103] Phase 6:

[0104] As the piston rod of the electric push rod 33 continues to retract, the horizontal section of the fixed rod 43 begins to push the sliding block 49 on the rear side, and the sliding block 49 on the rear side slightly compresses the spring 51 on the rear side, and the spring 51 on the rear side pushes the sliding frame 16 to slide backward as a whole, so that the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 both slide backward, and the measuring instrument fixing plate 7 gradually descends, and the standard instrument fixing plate 6 gradually rises. In this process, the piston rod of the electric push rod 33 continues to push the transverse sliding frame 35 to slide backward through the fixed rod 43, and the transverse sliding frame 35 continues to drive the longitudinal sliding plate 36 to slide backward. The lever 41 on the longitudinal sliding plate 36 slides backward inside the middle inclined section 39 of the second guide groove 37, so that the height of the lever 41 gradually increases, and the lever 41 drives the longitudinal sliding plate 36 to gradually rise inside the transverse sliding frame 35, and the upper rack 45 and the lower rack 47 gradually rise in the process of sliding backward.

[0105] When the measuring instrument fixing plate 7 slides backwards to completely enter the interior of the calibration box 5, the measuring instrument fixing plate 7 drops to the lowest height. At this time, the measuring instrument crossbar 15 is located at the rearmost end of the rear horizontal section of the first guide groove 19. The measuring instrument crossbar 15 cannot continue to slide backwards, so the sliding frame 16 cannot continue to slide backwards. At this time, the standard instrument fixing plate 6 slides backwards to enter the interior of the calibration port 4, the standard instrument crossbar 13 is located at the inner middle of the middle horizontal section 22 of the first guide groove 19, and a standard instrument is fixed on the standard instrument fixing plate 6. The measuring position of the standard instrument is located at the axis of the calibration tube 1.

[0106] When the standard instrument fixing plate 6 and the measuring instrument fixing plate 7 slide backward into place, the lever 41 on the longitudinal sliding plate 36 slides to the rear end of the middle inclined section 39 of the second guide groove 37, and the upper rack 45 and the lower rack 47 slide backward to the highest height. At this time, the lower rack 47 is located on the upper front side of the gear 48 and the rear end of the upper rack 45 is in a preliminary meshing state with the gear 48.

[0107] Stage 7:

[0108] As the piston rod of the electric push rod 33 continues to be retracted, since the sliding frame 16 no longer moves backward, the fixed rod 43 continues to slide backward under the drive of the electric push rod 33, so that the horizontal section of the fixed rod 43 continues to compress the spring 51 on the rear side. At the same time, the fixed rod 43 drives the transverse sliding frame 35 to continue to slide backward inside the sliding groove 34, and the transverse sliding frame 35 continues to drive the longitudinal sliding plate 36 to slide backward. The lever 41 on the longitudinal sliding plate 36 slides backward inside the upper horizontal section 38 of the second guide groove 37, so that the height of the longitudinal sliding plate 36 remains unchanged during the backward sliding process, and the height of the upper rack 45 and the lower rack 47 also remain unchanged during the backward sliding process. The lower rack 47 drives the gear 48 to rotate in the opposite direction during the backward sliding process, and the gear 48 drives the transmission rod 30 to rotate in the opposite direction. The transmission rod 30 drives the two rotating disks 29 to rotate in the opposite direction through the synchronous belt transmission mechanism 31 at both ends. The rotating disk 29 drives the third connecting rod 27, the second connecting rod 26, and the first connecting rod 25 to move in the opposite direction, so that the two closing plates 8 rotate back to the inside of the inspection port 4 until the two closing plates 8 completely close the inspection port 4.

[0109] At this time, the piston rod of the electric push rod 33 is completely retracted, the lower rack 47 completely passes through the gear 48, and the rear spring 51 is completely compressed. At this time, the device as a whole returns to the initial state of the first stage.

[0110] Then adjust the working parameters of the fan so that the wind speed inside the calibration tube 1 is adjusted, repeat the steps of the first to seventh stages above, and compare the measured values ​​of the anemometer with the measured values ​​of the standard instrument again according to different wind speeds, so as to obtain the error value of the anemometer at different wind speeds.

[0111] By setting a plurality of different wind speeds, the error values ​​of the anemometer at different wind speeds can be obtained, thereby completing the calibration of the anemometer.

[0112] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A calibration device for an anemometer, characterized in that: The device comprises a calibration tube (1), wherein an air inlet pipe (2) and an air outlet pipe (3) are respectively arranged at the openings at both ends of the calibration tube (1), and the air inlet pipe (2) is connected to a ventilator; a calibration port (4) is arranged at the center of the bottom plate of the calibration tube (1), and a calibration box (5) is fixedly arranged outside the calibration port (4); a standard instrument fixing plate (6) and a measuring instrument fixing plate (7) are arranged at the calibration port (4) through a sliding mechanism, and the sliding mechanism is used to realize the lifting and lowering of the standard instrument fixing plate (6) and the measuring instrument fixing plate (7) when sliding forward and backward; two closing plates (8) are arranged at the calibration port (4) through a connecting rod mechanism, and the opening and closing of the two closing plates (8) are realized through the connecting rod mechanism; a driving mechanism is arranged inside the calibration box (5), and the driving mechanism is connected to the sliding mechanism and the connecting rod mechanism, and the driving mechanism is used to realize the synchronous action of the connecting rod mechanism and the sliding mechanism.

2. A calibration device for an anemometer according to claim 1, characterized in that: The calibration port (4) is a square through hole; the standard instrument fixing plate (6) is located above the front side of the measuring instrument fixing plate (7); the standard instrument fixing plate (6) is located inside the calibration port (4); and the measuring instrument fixing plate (7) is located inside the calibration box (5) below the calibration port (4).

3. A calibration device for an anemometer according to claim 1, characterized in that: The sliding mechanism comprises a standard instrument lifting rod (12), a standard instrument cross bar (13), a measuring instrument lifting rod (14), and a measuring instrument cross bar (15); a vertical standard instrument lifting rod (12) is fixedly arranged at the four corners of the lower end surface of the standard instrument fixing plate (6), and a left-right horizontal standard instrument cross bar (13) is fixedly arranged between the lower ends of the four standard instrument lifting rods (12); a vertical measuring instrument lifting rod (14) is fixedly arranged at the four corners of the lower end surface of the measuring instrument fixing plate (7), and a left-right horizontal measuring instrument cross bar (15) is fixedly arranged between the lower ends of the four measuring instrument lifting rods (14).

4. A calibration device for an anemometer according to claim 3, characterized in that: The sliding mechanism further comprises a sliding frame (16) and a guide slot frame (18); the lower end of the sliding frame (16) is slidably arranged on the inner bottom surface of the calibration box (5) along the front-back direction; four standard instrument lifting rods (12) and four measuring instrument lifting rods (14) are respectively slidably inserted into the inner part of the upper end surface of the sliding frame (16); a guide slot frame (18) is arranged inside the sliding frame (16), and a first guide slot (19) is arranged on the guide slot frame (18) to pass through the left and right sides, and the first guide slot (19) comprises a front horizontal section (20), a front inclined section (21) and a front inclined section (22) connected in sequence. 21), a middle horizontal section (22), a rear inclined section (23), and a rear horizontal section (24); the front horizontal section (20) and the rear horizontal section (24) are of equal height, and the middle horizontal section (22) is higher than the front horizontal section (20) and the rear horizontal section (24); the standard instrument cross bar (13) and the measuring instrument cross bar (15) are both inserted into the first guide groove (19), wherein the standard instrument cross bar (13) is located at the inner middle part of the middle horizontal section (22), and the measuring instrument cross bar (15) is located at the inner rear end of the rear horizontal section (24).

5. A calibration device for an anemometer according to claim 4, characterized in that: Two front-to-back symmetrical closing plates (8) are arranged inside the inspection port (4), and the outer side surfaces of the two closing plates (8) are in contact with the inner wall of the inspection port (4); an avoidance groove is respectively arranged in the middle of the end surfaces of one side where the two closing plates (8) contact each other, and the standard instrument fixing plate (6) is located inside the avoidance grooves of the two closing plates (8).

6. A calibration device for an anemometer according to claim 5, characterized in that: The connecting rod mechanism comprises four groups of connecting rod assemblies, one group of connecting rod assemblies is respectively arranged at the left and right edges of the lower end surfaces of the front and rear closing plates (8); two groups of connecting rod assemblies are symmetrically arranged at the left and right sides of the sliding frame (16); the connecting rod assemblies comprise a rocker rod (28), a first connecting rod (25), a second connecting rod (26), and a third connecting rod (27); The upper end of the first connecting rod (25) is hinged to one end of the lower end surface of the closing plate (8) close to another closing plate (8), and the lower end of the first connecting rod (25) is hinged to the inner wall of the inspection box (5); the second connecting rod (26) is a curved rod-shaped structure, comprising a first rod segment, a second rod segment, and a third rod segment fixedly connected in sequence, a first hinge hole is provided at one end of the first rod segment away from the second rod segment, a second hinge hole is provided at one end of the third rod segment away from the second rod segment, and a third hinge hole is provided at the connection between the second rod segment and the third rod segment. The first hinge hole is hinged to the middle of the lower end surface of the closing plate (8), the third hinge hole is hinged to the inner wall of the inspection box (5), and the connecting line between the first hinge hole and the third hinge hole is parallel to the first connecting rod (25) and has the same length; one end of the third connecting rod (27) is hinged to the second hinge hole of the second connecting rod (26); one end of the swing rod (28) is fixedly arranged on the rotating disk (29), and the other end of the swing rod (28) is hinged to an end of the third connecting rod (27) away from the second connecting rod (26).

7. A calibration device for an anemometer according to claim 6, characterized in that: The swing rods (28) of the front and rear connecting rod assemblies on the left and right sides are fixed on the same rotating disk (29). The left and right rotating disks (29) are respectively rotatably arranged on the left and right inner walls of the inspection box (5) through rotating shafts. The same left and right horizontal transmission rods (30) are arranged at the lower ends of the two rotating disks (29). The transmission rods (30) are rotatably arranged on the inner bottom surface of the inspection box (5) through hinge seats. The two ends of the transmission rod (30) are respectively connected to the rotating shafts of the two rotating disks (29) through a set of synchronous belt transmission mechanisms (31).

8. A calibration device for an anemometer according to claim 7, characterized in that: The driving mechanism comprises an electric push rod (33), a fixed rod (43), a transverse sliding frame (35), and a longitudinal sliding plate (36); the electric push rod (33) is fixedly arranged on the inner bottom surface of the verification box (5), the piston rod of the electric push rod (33) is horizontally forward, and the piston rod of the electric push rod (33) is in a retracted state; a sliding groove (34) is arranged on the left inner wall of the verification box (5), and a transverse sliding frame (35) is slidably arranged in the sliding groove (34) along the front-rear direction, and the transverse sliding frame (35) 35) is located at the inner rear end of the sliding groove (34); a longitudinal sliding plate (36) is slidably arranged along the vertical direction on the right end surface of the transverse sliding frame (35); an action groove (42) is arranged on the side wall on the left side of the sliding frame (16); an L-shaped fixing rod (43) is fixedly arranged at the end of the piston rod of the electric push rod (33); the horizontal section of the fixing rod (43) passes through the action groove (42) of the sliding frame (16), and the upper end of the vertical section of the fixing rod (43) is fixedly connected to the lower end of the transverse sliding frame (35).

9. A calibration device for an anemometer according to claim 8, characterized in that: The driving mechanism further comprises a second guide groove (37), the second guide groove (37) being located on the inner wall of the sliding groove (34), the second guide groove (37) comprising an upper horizontal section (38), a middle inclined section (39), and a lower horizontal section (40) which are connected in sequence, the upper horizontal section (38) being located on the upper rear side of the lower horizontal section (40), a lever (41) being fixedly arranged on the inner side surface of the longitudinal sliding plate (36), the lever (41) passing through the transverse sliding frame (35) and being inserted into the second guide groove (37), and an end of the lever (41) away from the longitudinal sliding plate (36) being located at the inner rear end of the upper horizontal section (38) of the second guide groove (37); An upper acting rod (44) and a lower acting rod (46) are fixedly arranged at the upper and lower edges of the outer end surface of the longitudinal sliding plate (36), an upper rack (45) is fixedly arranged at the rear end of the lower end surface of the upper acting rod (44), and a lower rack (47) is fixedly arranged at the front end of the upper end surface of the lower acting rod (46); a gear (48) is fixedly arranged at the left end of the transmission rod (30), the gear (48) is located between the upper acting rod (44) and the lower acting rod (46), and the front end of the lower rack (47) is in a preliminary meshing state with the gear (48), and the upper rack (45) is located above the rear side of the gear (48).

10. A calibration device for an anemometer according to claim 9, characterized in that: Two sliding blocks (49) are slidably arranged in the front-to-back direction inside the action groove (42); a front-to-back horizontal guide rod (50) is fixedly arranged at the center of the end faces of the two sliding blocks (49) away from each other, and a guide hole is respectively arranged on the front and rear inner walls of the action groove (42), and the two guide rods (50) are respectively slidably inserted into the guide holes on the same side; a spring (51) is respectively sleeved on the outer sides of the two guide rods (50), and the two ends of the spring (51) are respectively fixedly connected to the sliding block (49) on the same side and the inner wall of the action groove (42); the horizontal section of the fixed rod (43) is located between the two sliding blocks (49); at this time, the horizontal section of the fixed rod (43) is in contact with the front end face of the rear sliding block (49), the rear spring (51) is in a compressed state, and the front spring (51) is in a freely extended state.

Images