An automatic metering calibrator and a calibration method

Abstract

The present invention relates to the technical field of dynamometer metrological calibration, and discloses an automatic metrological calibrator and a calibration method. The automatic metrological calibrator includes a bottom plate and a top plate. A plurality of support rods are connected between the bottom plate and the top plate. A bracket is fixedly connected to the bottom of the top plate. Two hanging rings are provided at the bottom of the bracket. Hang the hanging rope of the dynamometer to be calibrated on one of the hanging rings, hang one of the counterweights on the hook of the dynamometer to be calibrated, then hang the hanging rope of a standard metrological dynamometer on the other hanging ring, and hang a counterweight on the hook of the standard metrological dynamometer. At this time, the two counterweights lean on the stable structure. The staff slowly moves the stable structure so that the displacement of the stable structure gradually moves away from the counterweights until the counterweights are completely suspended. At this time, the staff can record the values presented on the two dynamometers. When the values are incorrect, the staff can rotate the adjustment knob on the dynamometer, achieving the effect of metrological calibration of the dynamometer.

Description

Technical Field

[0001] The invention relates to the technical field of tensile gauge measurement and calibration, and in particular to an automatic measurement and calibration instrument and a calibration method. Background Art

[0002] Common mechanical instruments include measuring instruments such as weighing scales, push-pull force gauges, torque gauges, hardness testers and vibration meters. Push-pull force gauges are mechanical measuring instruments used for push and pull testing. Push-pull force gauges are suitable for push-pull load testing in industries such as electronics and electrical appliances, light industry and textiles, building hardware, lighters and ignition devices, fire-fighting equipment, pen making, lock making, fishing gear, power machinery, scientific research institutions, etc.

[0003] In the prior art, for example, the Chinese patent with application number 202010872531.5 proposes a metrological calibration device. In view of the problems that the existing metrological calibration devices are large in size, inconvenient to carry, and have poor flexibility in use, the following scheme is proposed, which includes a mounting seat, the top of the mounting seat is provided with two slide grooves and a placement groove, two groups of calibration blocks are placed in the placement grooves, the top of the calibration block is fixedly connected with a hanging ring, and lifting plates are slidably installed in the two slide grooves, the top of the two lifting plates is fixedly installed with the same cover plate, the top of the cover plate is fixedly installed with a handle, and the bottom of the cover plate is fixedly installed with two fixed hooks, the two fixed hooks are respectively hung with a dynamometer to be calibrated and a standard dynamometer, and two threaded grooves are provided on the sides of the two lifting plates away from each other. The present invention facilitates the retraction of the two lifting plates, reduces the occupied space, is convenient for carrying, has a simple structure, and is easy to use.

[0004] However, when the calibration block is hung below the dynamometer, the calibration block is prone to shake at the bottom of the dynamometer, which will affect the accuracy of the dynamometer in measuring the weight of the calibration block. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides an automatic measurement and calibration instrument and a calibration method, which solves the problem that when the calibration block is hung below the tensile gauge, the calibration block is prone to shake at the bottom of the tensile gauge, which affects the accuracy of the tensile gauge in measuring the weight of the calibration block.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: an automatic metering calibrator, including a bottom plate and a top plate, a plurality of support rods are connected between the bottom plate and the top plate, a bracket is fixedly connected to the bottom of the top plate, two hanging rings are provided at the bottom of the bracket, a fixed block is fixedly connected to the top of the bottom plate, two counterweight blocks are provided in the fixed block, two fixed rings are fixedly connected to the top of the counterweight block, an adjusting structure for adjusting the position of the hanging ring is provided on the bracket, and a stabilizing structure for reducing the swaying amplitude of the counterweight block is provided between the bottom plate and the top plate.

[0009] Preferably, the stabilizing structure includes a connecting plate connected between the bottom plate and the top plate, a limiting rod is connected between every two support rods, and the connecting plate is slidably connected to the limiting rod.

[0010] Preferably, two toothed plates are fixedly connected to the bottom of the connecting plate, the toothed plates are slidably connected to the support rods, a support plate is fixedly connected to one side of the support rod, a driving motor is connected to one side of the support plate, a support rod is fixedly connected to one side of the support rod, a rotating rod is rotatably connected to the support rod, and a second gear meshing with the toothed plate is fixedly sleeved on the outside of the rotating rod, and a first gear meshing with the second gear is fixedly connected to the driving shaft of the driving motor.

[0011] Preferably, a first spring is connected between the connecting plate and the support rod.

[0012] Preferably, a clamping block is provided on one side of the support rod, a clamping groove adapted to the clamping block is opened at the top of the toothed plate, a plurality of connecting grooves are opened at the top of the clamping block, a connecting rod slidably sleeved with the connecting groove is fixedly connected to the bottom of the fixing plate, a second spring is connected between the fixing plate and the clamping block, a groove is opened at the bottom of the toothed plate, a plurality of fixing rods are fixedly connected to one side of the inside of the groove, a toothed block is provided in the groove, a sliding hole slidably sleeved with the fixing rod is opened on one side of the toothed block, and a plurality of third springs are connected between the toothed block and the groove.

[0013] Preferably, a connecting rod is connected between the two clamping blocks.

[0014] Preferably, the adjusting structure includes a toothed rod fixedly connected to the top of the hanging ring, a connecting strip is connected between the two toothed rods, a top opening slidably sleeved with the toothed rod is opened at the top of the bracket, a plurality of support blocks are fixedly connected to the top of the bracket, a rotating shaft is rotatably connected to the support block, and a third gear meshing with the toothed rod is fixedly sleeved on the outer side wall of the rotating shaft.

[0015] Preferably, limiting blocks are fixedly connected to both inner sides of the top opening, and limiting grooves adapted to the limiting blocks are respectively formed on both sides of the toothed rod.

[0016] Preferably, a turntable is slidably sleeved on one end of the rotating shaft. A plurality of support blocks are fixedly connected to one side of the turntable. A plurality of fixing grooves adapted to the support blocks are formed on one side of the support. A plurality of limiting strips are fixedly connected to the outer side wall of the rotating shaft, and the limiting strips are slidably connected to the turntable.

[0017] The present invention also provides a calibration method, and the specific steps of the method are as follows:

[0018] Step 1: Hang the hanging rope of the dynamometer to be calibrated on one of the pull rings, and hang one of the counterweights on the hook of the dynamometer to be calibrated.

[0019] Step 2: Hang the hanging rope of a dynamometer with a standard measurement on the other pull ring, and hang a counterweight on the hook of the dynamometer with a standard measurement.

[0020] Step 3: The counterweight leans against the connecting plate, and the counterweight and the dynamometer are in a non-vertical state.

[0021] Step 4: Start the driving motor. The driving shaft of the driving motor rotates to drive the toothed plate to move through the first gear and the second gear, and the movement of the toothed plate drives the connecting plate to move.

[0022] Step 5: The connecting plate gradually moves away from the counterweight, the counterweight and the dynamometer gradually tend to be in a vertical state, the connecting plate leaves the counterweight, and the counterweight is vertically suspended at the bottom of the dynamometer.

[0023] Step 6: The staff records the values presented on the two dynamometers. When the values are incorrect, the staff rotates the adjustment knob on the dynamometer to complete the measurement calibration of the dynamometer.

[0024] In the present invention, by providing hanging rings, when staff members calibrate a dynamometer, they can hang the hanging rope of the dynamometer to be calibrated on one of the pulling rings, hang one of the counterweights on the hook of the dynamometer to be calibrated, then hang the hanging rope of a dynamometer with a standard measurement on the other pulling ring, and hang a counterweight on the hook of the dynamometer with a standard measurement. At this time, the two counterweights lean against the stable structure. The staff slowly moves the stable structure so that the displacement of the stable structure gradually moves away from the counterweights until the counterweights are completely suspended. At this time, the staff can record the values shown on the two dynamometers. When the values are incorrect, the staff can rotate the adjustment knob on the dynamometer, achieving the effect of calibrating the dynamometer. Leaning the counterweights against the stable structure can avoid the problem of the counterweights swaying when they are directly hung on the dynamometer. The staff gradually moves the stable structure away from the counterweights, making the counterweights vertically hover at the bottom of the dynamometer, which can avoid the problem that the measured value of the dynamometer for measuring the weight of the counterweights is inaccurate due to the swaying of the counterweights. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a schematic diagram of the structure of the fixed block of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the bracket of the present invention;

[0028] Figure 4 is a schematic diagram of the stable structure of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of the clamping block of the present invention;

[0030] Figure 6 is a schematic diagram of the structure of the groove of the present invention;

[0031] Figure 7 is Figure 3 a partially enlarged schematic diagram of the local structure at A in

[0032] Figure 8 is Figure 3 a partially enlarged schematic diagram of the local structure at A in

[0033] Figure 9 is a schematic diagram of the method steps of the present invention.

[0034] In the figure: 100, bottom plate; 101, top plate; 102, support rod; 103, bracket; 104, hanging ring; 105, fixing block; 106, counterweight; 107, fixing ring; 200, connecting plate; 201, limiting rod; 202, toothed plate; 203, support plate; 204, driving motor; 205, first gear; 206, rotating rod; 207, second gear; 208, support rod; 209, first spring; 300, clamping block; 301, clamping groove; 302, fixing plate; 303, connecting groove; 304, connecting rod; 305, second spring; 306, groove; 307, fixing rod; 308, toothed block; 309, sliding hole; 310, third spring; 311, connecting rod; 400, toothed rod; 401, top opening; 402, rotating shaft; 403, third gear; 404, connecting strip; 405, limiting groove; 406, limiting block; 407, support block; 408, fixing groove; 409, turntable; 410, support block; 411, limiting strip. Detailed implementation mode

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 - 9 , an automatic metering calibrator, including a bottom plate 100 and a top plate 101. A plurality of support rods 102 are connected between the bottom plate 100 and the top plate 101. A bracket 103 is fixedly connected to the bottom of the top plate 101. Two hanging rings 104 are provided at the bottom of the bracket 103. A fixing block 105 is fixedly connected to the top of the bottom plate 100. Two counterweights 106 are provided in the fixing block 105. Two fixing rings 107 are fixedly connected to the top of the counterweight 106. An adjusting structure for adjusting the position of the hanging ring 104 is provided on the bracket 103. A stabilizing structure for reducing the swaying amplitude of the counterweight 106 is provided between the bottom plate 100 and the top plate 101;

[0037] By setting the hanging ring 104, when the staff calibrates the dynamometer, the hanging rope of the dynamometer to be calibrated can be hung on one of the pulling rings, one of the counterweights 106 can be hung on the hook of the dynamometer to be calibrated, then the hanging rope of a dynamometer with a standard measurement can be hung on the other pulling ring, and a counterweight 106 can be hung on the hook of the dynamometer with a standard measurement. At this time, the two counterweights 106 lean against the stable structure. The staff slowly moves the stable structure so that the displacement of the stable structure gradually moves away from the counterweight 106 until the counterweight 106 is completely suspended. At this time, the staff can record the values presented on the two dynamometers. When the values are incorrect, the staff can rotate the adjustment knob on the dynamometer, achieving the effect of calibrating the dynamometer. Leaning the counterweight 106 against the stable structure can avoid the problem of the counterweight 106 swaying when the counterweight 106 is directly hung on the dynamometer. The staff gradually moves the stable structure away from the counterweight 106, making the counterweight 106 vertically hover at the bottom of the dynamometer, which can avoid the problem that the measured value of the dynamometer for measuring the weight of the counterweight 106 is inaccurate due to the swaying of the counterweight 106.

[0038] As a further solution of the present invention, the stable structure includes a connecting plate 200 connected between the bottom plate 100 and the top plate 101. A limiting rod 201 is connected between every two support rods 102, and the connecting plate 200 is slidably connected to the limiting rod 201;

[0039] By setting the connecting plate 200, during use, the staff can slide the connecting plate 200 to the bottom of the hanging ring 104. When the counterweight 106 is hung on the dynamometer, the counterweight 106 leans against the connecting plate 200. At this time, the counterweight 106 and the dynamometer are in a non-vertical state. The staff can slowly move the position of the connecting plate 200 so that the connecting plate 200 gradually moves away from the counterweight 106. At this time, the counterweight 106 and the dynamometer gradually tend to be in a vertical state. When the connecting plate 200 leaves the counterweight 106, the counterweight 106 is vertically suspended at the bottom of the dynamometer, thereby reducing the time required for the counterweight 106 to hover at the bottom of the dynamometer and reducing the swaying amplitude of the counterweight 106.

[0040] As a further solution of the present invention, two toothed plates 202 are fixedly connected to the bottom of the connecting plate 200. The toothed plates 202 are slidably connected to the support rods 102. One side of the support rod 102 is fixedly connected with a support plate 203. One side of the support plate 203 is connected with a driving motor 204. One side of the support rod 102 is fixedly connected with a support rod 208. A rotating rod 206 is rotatably connected to the support rod 208. A second gear 207 meshing with the toothed plate 202 is fixedly sleeved on the outside of the rotating rod 206. A first gear 205 meshing with the second gear 207 is fixedly connected to the driving shaft of the driving motor 204;

[0041] By setting the driving motor 204, when it is necessary to move the connecting plate 200, the staff starts the driving motor 204. The rotation of the driving shaft of the driving motor 204 can drive the toothed plate 202 to move through the first gear 205 and the second gear 207. The movement of the toothed plate 202 can drive the connecting plate 200 to move, so as to achieve the effect of moving the position of the connecting plate 200. The set driving motor 204 can replace the staff to manually push the connecting plate 200, thereby can keep the moving speed of the connecting plate 200 constant, and can make the connecting plate 200 leave the counterweight 106 at a stable speed, avoiding the situation that the moving speed of the connecting plate 200 is too fast or too slow when manually pushing the connecting plate 200, which causes the counterweight 106 to vibrate. If the counterweight 106 vibrates, it will affect the time required for the counterweight 106 to hover at the bottom of the tensiometer.

[0042] As a further solution of the present invention, a first spring 209 is connected between the connecting plate 200 and the support rod 102;

[0043] By setting the first spring 209, when the connecting plate 200 moves away from the counterweight 106, the first spring 209 compresses to generate potential energy. After the tensiometer is calibrated, the staff can stop the driving motor 204. At this time, the connecting plate 200 can be reset by the potential energy of the first spring 209, which is convenient for subsequent calibration of the next tensiometer to be calibrated.

[0044] As a further solution of the present invention, a clamping block 300 is provided on one side of the support rod 102. A clamping groove 301 adapted to the clamping block 300 is opened at the top of the toothed plate 202. A fixing plate 302 is fixedly connected to one side of the support rod 102. A plurality of connecting grooves 303 are opened at the top of the clamping block 300. A connecting rod 304 slidably sleeved with the connecting groove 303 is fixedly connected to the bottom of the fixing plate 302. A second spring 305 is connected between the fixing plate 302 and the clamping block 300. A groove 306 is opened at the bottom of the toothed plate 202. A plurality of fixing rods 307 are fixedly connected to one side inside the groove 306. A toothed block 308 is provided in the groove 306. A sliding hole 309 slidably sleeved with the fixing rod 307 is opened on one side of the toothed block 308. A plurality of third springs 310 are connected between the toothed block 308 and the groove 306;

[0045] By setting the tooth block 308, when the drive shaft of the drive motor 204 rotates to drive the toothed plate 202 to move through the first gear 205 and the second gear 207, after the toothed plate 202 moves to the preset position, the second gear 207 meshes with the tooth block 308. When the drive shaft of the drive motor 204 rotates, it can make the second gear 207 drive the tooth block 308 to slide in the groove 306, so that the tooth block 308 and the second gear 207 can always mesh. Thus, the position of the fixed connection plate 200 can be fixed without stopping the drive motor 204. The set catch 300 can, after the toothed plate 202 moves to the preset position, be clamped with the card slot 301 under the force of the second spring 305, so as to fix the position of the toothed plate 202, avoiding the vibration of the toothed plate 202 under the influence of the rotation of the drive shaft of the drive motor 204 through the second gear 207 and the tooth block 308.

[0046] As a further solution of the present invention, a connecting rod 311 is connected between the two catches 300;

[0047] By setting the connecting rod 311, when it is necessary to reset the position of the connection plate 200, the staff member lifts the connecting rod 311 upward, so that the catch 300 leaves the card slot 301. At this time, the connection plate 200 can be reset under the force of the first spring 209.

[0048] As a further solution of the present invention, the adjusting structure includes a toothed rod 400 fixedly connected to the top of the hanging ring 104. A connecting strip 404 is connected between the two toothed rods 400. A top opening 401 which is slidably sleeved with the toothed rod 400 is opened at the top of the bracket 103. A plurality of support blocks 407 are fixedly connected to the top of the bracket 103. A rotating shaft 402 is rotatably connected to the support block 407. A third gear 403 which meshes with the toothed rod 400 is fixedly sleeved on the outer side wall of the rotating shaft 402;

[0049] By setting the rotating shaft 402, the staff member can rotate the rotating shaft 402. The rotation of the rotating shaft 402 can move the position of the toothed rod 400 upward or downward through the third gear 403. The movement of the toothed rod 400 can drive the hanging ring 104 to move. When the hanging ring 104 moves upward, the distance between the hanging ring 104 and the bottom plate 100 can be increased to adapt to dynamometers of different sizes and lengths.

[0050] As a further solution of the present invention, limiting blocks 406 are respectively fixedly connected to both sides inside the top opening 401. Limiting grooves 405 which are adapted to the limiting blocks 406 are respectively opened on both sides of the toothed rod 400;

[0051] By setting the limiting blocks 406 and the limiting grooves 405, the position of the toothed rod 400 can be limited, avoiding the deviation of the toothed rod 400 when moving upward.

[0052] As a further solution of the present invention, one end of the rotating shaft 402 is slidably sleeved with a turntable 409. One side of the turntable 409 is fixedly connected with a plurality of supporting blocks 410. A plurality of fixing grooves 408 adapted to the supporting blocks 410 are provided on one side of the bracket 103. A plurality of limiting strips 411 are fixedly connected to the outer side wall of the rotating shaft 402, and the limiting strips 411 are slidably connected with the turntable 409;

[0053] By providing the turntable 409, when the position of the hanging ring 104 needs to be adjusted, the staff rotates the turntable 409 to make the rotating shaft 402 rotate. When the position of the hanging ring 104 needs to be fixed, the turntable 409 is pushed to make the supporting blocks 410 on the turntable 409 engage with the fixing grooves 408, so as to fix the position of the turntable 409.

[0054] The present invention also provides a calibration method, and the specific steps are as follows:

[0055] Step 1: Hang the hanging rope of the dynamometer to be calibrated on one of the pull rings, and hang one of the counterweights 106 on the hook of the dynamometer to be calibrated;

[0056] Step 2: Hang the hanging rope of a dynamometer with a standard measurement on the other pull ring, and hang a counterweight 106 on the hook of the dynamometer with a standard measurement;

[0057] Step 3: The counterweight 106 leans against the connecting plate 200, and the counterweight 106 and the dynamometer are in a non-vertical state;

[0058] Step 4: Start the driving motor 204. The driving shaft of the driving motor 204 rotates to drive the toothed plate 202 to move through the first gear 205 and the second gear 207, and the movement of the toothed plate 202 drives the connecting plate 200 to move;

[0059] Step 5: The connecting plate 200 gradually moves away from the counterweight 106, the counterweight 106 and the dynamometer gradually tend to be in a vertical state, the connecting plate 200 leaves the counterweight 106, and the counterweight 106 is vertically suspended at the bottom of the dynamometer;

[0060] Step 6: The staff records the values presented on the two dynamometers. When the values are incorrect, the staff rotates the adjustment knob on the dynamometer to complete the metrological calibration of the dynamometer.

[0061] Specific usage principle of the device: By setting the hanging ring 104, when the staff calibrates the dynamometer, the hanging rope of the dynamometer to be calibrated can be hung on one of the hanging rings, one of the counterweight blocks 106 can be hung on the hook of the dynamometer to be calibrated, then the hanging rope of a dynamometer with a standard measurement can be hung on the other hanging ring, and a counterweight block 106 can be hung on the hook of the dynamometer with a standard measurement. At this time, the two counterweight blocks 106 lean against the stable structure. The staff slowly moves the stable structure so that the displacement of the stable structure gradually moves away from the counterweight blocks 106 until the counterweight blocks 106 are completely suspended. At this time, the staff can record the values shown on the two dynamometers. When the values are incorrect, the staff can rotate the adjustment knob on the dynamometer, achieving the effect of calibrating the dynamometer. Leaning the counterweight blocks 106 against the stable structure can avoid the problem of the counterweight blocks 106 swaying when they are directly hung on the dynamometer. When the staff gradually moves the stable structure away from the counterweight blocks 106, the counterweight blocks 106 are vertically suspended at the bottom of the dynamometer, which can avoid the problem that the measured value of the dynamometer for the weight of the counterweight blocks 106 is inaccurate due to the swaying of the counterweight blocks 106.

[0062] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic metering calibrator, characterized in that, it includes a bottom plate (100) and a top plate (101). A plurality of support rods (102) are connected between the bottom plate (100) and the top plate (101). A bracket (103) is fixedly connected to the bottom of the top plate (101). Two hanging rings (104) are provided at the bottom of the bracket (103). A fixed block (105) is fixedly connected to the top of the bottom plate (100). Two counterweight blocks (106) are provided in the fixed block (105). Two fixed rings (107) are fixedly connected to the top of the counterweight block (106). An adjusting structure for adjusting the position of the hanging ring (104) is provided on the bracket (103). A stabilizing structure for reducing the swaying amplitude of the counterweight block (106) is provided between the bottom plate (100) and the top plate (101); The stabilizing structure includes a connecting plate (200) connected between the bottom plate (100) and the top plate (101). A limiting rod (201) is connected between every two support rods (102). The connecting plate (200) is slidably connected to the limiting rod (201); Two toothed plates (202) are fixedly connected to the bottom of the connecting plate (200); A clamping block (300) is provided on one side of the support rod (102). A clamping groove (301) adapted to the clamping block (300) is opened at the top of the toothed plate (202). A fixing plate (302) is fixedly connected to one side of the support rod (102). A plurality of connecting grooves (303) are opened at the top of the clamping block (300). A connecting rod (304) slidably sleeved with the connecting groove (303) is fixedly connected to the bottom of the fixing plate (302). A second spring (305) is connected between the fixing plate (302) and the clamping block (300). A groove (306) is opened at the bottom of the toothed plate (202). A plurality of fixing rods (307) are fixedly connected to one side inside the groove (306). A toothed block (308) is provided in the groove (306). A sliding hole (309) slidably sleeved with the fixing rod (307) is opened on one side of the toothed block (308). A plurality of third springs (310) are connected between the toothed block (308) and the groove (306); A connecting rod (311) is connected between the two clamping blocks (300).

2. An automatic metering calibrator according to claim 1, characterized in that, the toothed plate (202) is slidably connected to the support rod (102). A support plate (203) is fixedly connected to one side of the support rod (102). A driving motor (204) is connected to one side of the support plate (203). A support rod (208) is fixedly connected to one side of the support rod (102). A rotating rod (206) is rotatably connected to the support rod (208). A second gear (207) meshing with the toothed plate (202) is fixedly sleeved on the outside of the rotating rod (206). A first gear (205) meshing with the second gear (207) is fixedly connected to the driving shaft of the driving motor (204).

3. An automatic metering calibrator according to claim 2, characterized in that, a first spring (209) is connected between the connecting plate (200) and the support rod (102).

4. An automatic metering calibrator according to claim 2, characterized in that, the adjusting structure includes a toothed rod (400) fixedly connected to the top of the hanging ring (104), a connecting strip (404) is connected between the two toothed rods (400), a top opening (401) slidably sleeved with the toothed rod (400) is opened at the top of the bracket (103), a plurality of support blocks (407) are fixedly connected to the top of the bracket (103), a rotating shaft (402) is rotatably connected to the support block (407), and a third gear (403) meshing with the toothed rod (400) is fixedly sleeved on the outer side wall of the rotating shaft (402).

5. An automatic metering calibrator according to claim 4, characterized in that, limiting blocks (406) are respectively fixedly connected to both sides inside the top opening (401), and limiting grooves (405) adapted to the limiting blocks (406) are respectively opened on both sides of the toothed rod (400).

6. An automatic metering calibrator according to claim 5, characterized in that, a turntable (409) is slidably sleeved at one end of the rotating shaft (402), a plurality of support blocks (410) are fixedly connected to one side of the turntable (409), a plurality of fixing grooves (408) adapted to the support blocks (410) are opened on one side of the bracket (103), and a plurality of limiting strips (411) are fixedly connected to the outer side wall of the rotating shaft (402), and the limiting strips (411) are slidably connected to the turntable (409).

7. A calibration method applicable to an automatic metering calibrator according to any one of claims 1-6, characterized in that, the specific steps of this method are as follows: Step 1: Hang the hanging rope of the dynamometer to be calibrated on one of the pull rings, and hang one of the counterweights (106) on the hook of the dynamometer to be calibrated; Step 2: Hang the hanging rope of a standard metering dynamometer on the other pull ring, and hang a counterweight (106) on the hook of the standard metering dynamometer; Step 3: The counterweight (106) leans against the connecting plate (200), and the counterweight (106) and the dynamometer are in a non-vertical state; Step 4: Start the drive motor (204), the drive shaft of the drive motor (204) rotates to drive the toothed plate (202) to move through the first gear (205) and the second gear (207), and the movement of the toothed plate (202) drives the connecting plate (200) to move; Step 5: The connecting plate (200) gradually moves away from the counterweight (106), the counterweight (106) and the dynamometer gradually tend to be in a vertical state, the connecting plate (200) leaves the counterweight (106), and the counterweight (106) is vertically suspended at the bottom of the dynamometer; Step 6: The staff records the values presented on the two dynamometers. When the values are incorrect, the staff rotates the adjustment knob on the dynamometer to complete the metering calibration of the dynamometer.

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