Counting measuring device for rain gauge

Abstract

The utility model discloses a counting measuring device for a rain gauge, and relates to a device for calibrating the rain gauge. The utility model aims to overcome the problems of large size, poor flexibility and inconvenience in field calibration of the calibration and measurement device of the existing rain gauge. The calibration and measurement device comprises a counting unit and a simulated rainwater quantitative container, the water quantity counting signal input end of the counting unit can be electrically connected with the water quantity counting signal output end of the rain gauge; the simulated rainwater quantitative container is a transparent container, the bottom of the simulated rainwater quantitative container is provided with a water outlet, and the side wall of the simulated rainwater quantitative container is provided with scales; the simulated rainwater quantitative container can be fixed above an inlet of a water collecting funnel of the rain gauge.

Description

Technical Field

[0001] The utility model relates to a device for calibrating a rain gauge. Background Art

[0002] The calibration process of existing rain gauges relies on data cables to connect the pulse signal output and access specific software through computers to evaluate their measurement performance. This requires field operators to carry a computer, which constitutes an obvious burden when calibrating on site. The size and weight of the computer limit its application flexibility in complex terrain or bad weather conditions. In addition, the operation of the computer requires a stable power supply, and it is not easy to find a reliable power supply in the field environment. This not only increases the difficulty of the calibration operation, but may also cause calibration interruptions due to power problems, affecting overall efficiency. Utility Model Content

[0003] The utility model aims to overcome the problems that the calibration measuring device of the existing rain gauge is large in size, poor in flexibility and inconvenient in on-site calibration, and provides a counting measuring device for the rain gauge.

[0004] The counting and measuring device for a rain gauge of the utility model comprises a counting unit and a simulated rainwater quantitative container;

[0005] The water quantity counting signal input terminal of the counting unit can be electrically connected to the water quantity counting signal output terminal of the rain gauge;

[0006] The simulated rainwater quantitative container is a transparent container, the bottom of which is provided with a water outlet, and the side wall of which is provided with scales; the simulated rainwater quantitative container can be fixed above the water collecting funnel inlet of the rain gauge.

[0007] The beneficial effects of the utility model are:

[0008] The counting and measuring device for a rain gauge of the utility model has a small size and high flexibility, and can be set to be detachable, so that it can be easily carried after being disassembled. It can measure rain gauges of multiple specifications, thereby reducing the cost of measurement and procurement, and making the measurement of on-site calibration of the rain gauge more efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the electrical structure of the counting and measuring device for the rain gauge of the utility model;

[0010] Figure 2 It is a structural schematic diagram of a counting and measuring device for a rain gauge of the utility model;

[0011] Figure 3 It is a structural schematic diagram of another angle of the counting and measuring device for a rain gauge of the utility model;

[0012] Figure 4 It is a schematic diagram of the matching structure of the counting and measuring device for the rain gauge and the rain gauge of the utility model;

[0013] Figure 5 for Figure 4 Schematic diagram of the structure of the mesoscale rain gauge;

[0014] Figure 6 for Figure 4 Schematic diagram of the structure of the mesorainmeter from another angle. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. Specific implementation method 1

[0019] The counting and measuring device for a rain gauge of this embodiment includes a counting unit 1-1 and a simulated rainwater quantitative container 2;

[0020] The water quantity counting signal input terminal of the counting unit 1-1 can be electrically connected to the water quantity counting signal output terminal of the rain gauge;

[0021] The simulated rainwater quantitative container 2 is a transparent container, the bottom of which is provided with a water outlet, and the side wall is provided with a scale; the simulated rainwater quantitative container 2 can be fixed above the inlet of the water collecting funnel 3-9 of the rain gauge.

[0022] Specifically, the tipping bucket rain gauge is an instrument for measuring precipitation, and is mainly composed of a water collecting funnel 3-9, an upper tipping bucket 3-3, a collecting funnel 3-4, a reed switch 3-7, a metering tipping bucket 3-5, and a counting tipping bucket 3-6. In theory, whenever the rainfall reaches 0.1 mm, the counting tipping bucket 3-6 turns over once, and there is a small magnet 3-8 on the upper part of the counting tipping bucket 3-6, and a reed switch 3-7 is installed on the magnet 3-8. Every time the counting tipping bucket 3-6 turns over, the magnet 3-8 scans the reed switch 3-7 once, and the reed switch 3-7 is closed once due to magnetization, and a water counting signal (pulse signal) is sent out. One water counting signal corresponds to 0.1 mm precipitation.

[0023] The counting and measuring device comprises a counting unit 1-1, a display unit 1-3 and a simulated rainwater quantitative container 2. The counting unit 1-1 can adopt a QF-MC03 type counter.

[0024] The counting unit 1-1 is connected to the water counting signal output terminal of the rain gauge. When 0.1 mm of water falls into the counting bucket 3-6, the counting bucket 3-6 will flip over, and a value will change on the display unit 1-3. For example, the counting bucket 3-6 will display 001 when it flips once, 010 when it flips 10 times, and so on.

[0025] The simulated rainwater quantitative container 2 can be a funnel with a scale, which is used to hold a certain volume of water for testing in advance, and is set up directly above the rain gauge during the test, and the switch below is turned on and the opening is adjusted to simulate rainfall. And because the rainfall is usually calculated in mm height, the cross-sectional size of the simulated rainwater quantitative container 2 can be set to be consistent with the cross-sectional area of ​​the water container of the rain gauge, so as to facilitate the identification of the scale and the accuracy of the measurement.

[0026] The counting and measuring device of the rain gauge is used for troubleshooting of the rain gauge. If the rain gauge fails, the measured rainfall will be inaccurate. The counting unit 1-1 is connected to the rain gauge, and then artificial precipitation is tested through the simulated rainwater quantitative container 2.

[0027] For example, when calibrating the standard 10mm precipitation, the counting bucket 3-6 will flip once every time it receives 0.1mm of water. Theoretically, it should flip 100 times in total and output 100 water counting signals, and the display unit 1-2 should display 100. When the rain gauge is actually working, the measurement is allowed to be within a certain error (the error can be set according to relevant standards and operating specifications).

[0028] After all the water in the simulated rainwater quantitative container 2 is released (or released to the required scale), the operator can directly observe the indication on the display unit 1-2 or an external display in the second specific implementation mode. If the operator knows the allowable error at this time, he can know whether the rain gauge is working within the allowable error range through the indication at this time. If it exceeds the allowable error range, the rain gauge can be calibrated according to the size of the indication. Specific implementation method 2

[0030] This embodiment is a further description of the first embodiment. In this embodiment, a display unit 1-3 is further included.

[0031] The counting output terminal of the counting unit 1 - 1 is electrically connected to the counting display signal input terminal of the display unit 1 - 3 .

[0032] Specifically, the display unit 1-2 can use the display screen of the QF-MC03 counter. After all the water in the simulated rainwater quantitative container 2 is released (or released to the required scale), the operator can directly observe the reading through the display unit 1-2 and perform subsequent calibration work. Specific implementation method three

[0034] This embodiment is a further description of the second embodiment. In this embodiment, a comparison unit 1-2 and a trigger unit 1-4 are further included.

[0035] The counting output terminal of the counting unit 1-1 is also electrically connected to the counting input terminal of the comparing unit 1-2;

[0036] The trigger signal output terminal of the trigger unit 1-4 is electrically connected to the count termination signal input terminal of the counting unit 1-1;

[0037] The counting unit 1 - 1 can terminate the counting after receiving the trigger signal and send the current count as the final count to the comparing unit 1 - 2 ;

[0038] The comparison unit 1-2 can compare the final count with the pre-stored expected count after receiving the final count; and generate an alarm message when the difference between the final count and the expected count exceeds a set error threshold;

[0039] The alarm information output terminal of the comparison unit 1 - 2 is electrically connected to the alarm information display signal input terminal of the display unit 1 - 3 .

[0040] Specifically, the comparison unit 1-2 and the trigger unit 1-4, the comparison unit 1-2 is a low-power microprocessor with calculation function and simple storage function, such as PIC12F675, etc., and the trigger unit 1-4 adopts a key. After all the water in the simulated rainwater quantitative container 2 is released (or released to the required scale), the operator can also stop counting the counting unit 1-1 by pressing the trigger unit 1-4, so that the number displayed on the display unit 1-2 stops increasing at this time.

[0041] If the reading is a value beyond the error range, a corresponding alarm signal is generated through the difference calculation of the comparison unit 1-2. The operator can then directly determine whether the rain gauge is qualified. It is known whether the value exceeds the error allowable range without calculation, and the rain gauge can be calibrated according to the reading to meet the technical requirements of the rain gauge accuracy. If an automatic adjustment device is used later, the result of the comparison unit 1-2 can also be used as a parameter for automatic adjustment and calibration.

[0042] There can be multiple trigger units 1-4, and the expected count corresponding to the water volume during the test can be input to the comparison unit 1-2 according to the number of triggers, and stored in the memory of the comparison unit 1-2. For example, if triggered once, the generated value in the comparison unit 1-2 is the expected count of 100, and is stored.

[0043] The comparison and difference processes in the above-mentioned comparison unit 1-2 are all based on the existing comparison algorithm, and the process of the trigger unit 1-4 triggering the generation and storage or the comparison unit 1-2 pre-storing the corresponding expected count is also based on the own function of the comparison unit 1-2, which can be obtained through existing technologies such as the technical manual of the specific model processor selected by the comparison unit 1-2. Specific implementation method four

[0045] This embodiment is a further description of the second embodiment. In this embodiment, a counting device housing 1-5 is also included;

[0046] The counting unit 1-1 and the comparing unit 1-2 are both fixed in the counting device housing 1-5;

[0047] The display unit 1-3 and the trigger unit 1-4 are both arranged on the outer side wall of the counting device housing 1-5.

[0048] The other technical features of this embodiment are exactly the same as those of the first embodiment.

[0049] Specifically, the housing 1-5 of the counting device may be made of waterproof material to prevent rain from damaging electronic devices such as the counting unit 1-1 during simulated rainfall. Specific implementation method five

[0051] This embodiment is a further description of the fourth embodiment. In this embodiment, battery compartments 1-6 are also included;

[0052] The battery compartment 1-6 is arranged inside the counting device housing 1-5, and a battery compartment opening is opened at a corresponding position between the side wall of the counting device housing 1-5 and the battery compartment 1-6.

[0053] The other technical features of this embodiment are exactly the same as those of embodiment one or two.

[0054] Specifically, the battery compartment 1-6 is used to place a power supply, and the power supply can provide DC power to electronic devices such as the counting unit 1-1. Specific implementation method 6

[0056] This embodiment is a further description of the fifth embodiment. In this embodiment, the rain gauge includes a support frame 3-1 and a device fixing seat 3-2;

[0057] The device fixing seat 3-2 is fixed on the supporting frame 3-1;

[0058] The device fixing seat 3-2 is a hollow shell with an opening on the side wall, and the opening matches the counting device shell 1-5, so that the counting device shell 1-5 can be inserted into the opening and fixed to the support frame 3-1 through the device fixing seat 3-2.

[0059] The other technical features of this embodiment are exactly the same as those of the third embodiment.

[0060] Specifically, the counting and measuring device for the rain gauge can be configured to be detachable, so that it can be easily carried after being disassembled.

[0061] Therefore, the counting and measuring device can measure rain gauges of multiple specifications, thereby reducing the cost of measurement and procurement. Specific implementation method seven

[0063] This embodiment is a further description of the fourth, fifth or sixth embodiment. In this embodiment, the jack 1-8 and the plug 1-7 adapted to the jack 1-8 are further included.

[0064] The jack 1-8 is fixed on the support frame 3-1 and is located in the device fixing seat 3-2, and the jack 1-8 is electrically connected to the water volume counting signal output terminal of the rain gauge;

[0065] The plug 1-7 is fixed to the outer wall of the counting device housing 1-5, and the plug 1-7 is electrically connected to the water volume counting signal input terminal of the counting unit 1-1; by inserting the plug 1-7 into the socket 1-8, the water volume counting signal input terminal of the counting unit 1-1 is electrically connected to the water volume counting signal output terminal of the rain meter.

[0066] The other technical features of this embodiment are exactly the same as those of embodiment 4.

[0067] Specifically, the plug 1-7 and the socket 1-8 enable the counting device housing 1-5 to be easily plugged in. When the counting unit 1-1 is in use, the plug 1-7 can be directly inserted into the socket 1-8 to receive signals, and this plug-in method can further firmly fix the counting device housing 1-5 on the support frame 3-1. Specific implementation method eight

[0069] This embodiment is a further description of the first, second, third, fourth, fifth or sixth embodiment. In this embodiment, the rain gauge further includes an upper tipping bucket 3-3, a collecting funnel 3-4, a metering tipping bucket 3-5, a counting tipping bucket 3-6, a reed switch 3-7 and a pair of magnetic steels 3-8;

[0070] The water collecting funnel 3-9 is fixed on the supporting frame 3-1;

[0071] The upper tipping bucket 3-3 is rotatably matched with the support frame 3-1 through the first rotating shaft and is located below the water collecting funnel 3-9; so that when one end of the upper tipping bucket 3-3 is tilted, the tilted end can be located at the outlet of the water collecting funnel 3-9;

[0072] The collecting funnel 3-4 is fixed on the supporting frame 3-1 and is located below the upper tipping bucket 3-3;

[0073] The metering bucket 3-5 is rotatably matched with the support frame 3-1 through the second rotating shaft and is located below the collecting funnel 3-4; so that when one end of the metering bucket 3-5 is tilted, the tilted end can be located at the outlet of the collecting funnel 3-4;

[0074] The counting bucket 3-6 is rotatably matched with the support frame 3-1 through the third rotating shaft and is located below the metering bucket 3-5; the two ends of the counting bucket 3-6 correspond to the two ends of the metering bucket 3-5;

[0075] The reed switch 3-7 is fixed on the support frame 3-1, and the switch signal output ends at both ends of the reed switch 3-7 are used as the water volume counting signal output ends of the rain gauge;

[0076] A pair of magnets 3-8 are respectively fixed at the two ends of the counting bucket 3-6, so that when either end of the counting bucket 3-6 is tilted, the switch signal output end corresponding to the reed switch 3-7 can sense the magnet 3-8 at the tilted end and output a water volume counting signal.

[0077] The other technical features of this embodiment are exactly the same as those of embodiments one, two, four or five. Specific implementation method nine

[0079] This embodiment is a further explanation of the eighth embodiment. In this embodiment, the rain gauge further includes an upper tipping bucket adjustment device;

[0080] The upper dump bucket adjustment device comprises an upper dump bucket adjustment limit plate 4-1 and a pair of upper dump bucket adjustment bolts 4-2;

[0081] The upper dump bucket adjustment limit plate 4-1 is located on the mirror symmetry plane of the upper dump bucket 3-3 and is fixed to the upper dump bucket 3-3;

[0082] A pair of upper dump bucket adjustment bolts 4-2 are respectively located on both sides of the upper dump bucket adjustment limit plate 4-1; the pair of upper dump bucket adjustment bolts 4-2 are both spirally matched with the support frame 3-1, so that when the upper dump bucket adjustment bolts 4-2 are rotated, the distance between the upper dump bucket adjustment limit plate 4-1 and the corresponding side can be changed, thereby changing the flipping angle of the upper dump bucket 3-3.

[0083] The other technical features of this embodiment are exactly the same as those of embodiment six.

[0084] Specifically, in order to ensure the measurement accuracy of the rain gauge under different natural precipitation intensities, a synergistic mechanism between the upper tipping bucket 3-3 and the collecting tipping bucket 3-4 is designed. Through the accumulation effect of the upper tipping bucket 3-3 and the collecting tipping bucket 3-4, the fluctuating natural precipitation intensity is converted into a relatively stable precipitation input, thereby effectively reducing the measurement error caused by the fluctuation of precipitation intensity.

[0085] When the rain gauge has a large error, the upper bucket adjustment device can be adjusted to finely control the flip angle of the upper bucket 3-3. This can optimize the capture and transfer efficiency of the upper bucket 3-3 for precipitation, thereby achieving relatively constant control of the total amount of precipitation, ensuring that the rain gauge can provide accurate and reliable measurement results under various precipitation conditions. Specific implementation method 10

[0087] This embodiment is a further description of the eighth or ninth embodiment. In this embodiment, the rain gauge further includes a metering bucket adjustment device;

[0088] The metering tipping bucket adjustment device comprises a metering tipping bucket adjustment limit plate 5-1 and a pair of metering tipping bucket adjustment bolts 5-2;

[0089] The metering bucket adjustment limit plate 5-1 is located on the mirror symmetry plane of the metering bucket 3-5 and is fixed to the metering bucket 3-5;

[0090] A pair of metering bucket adjustment bolts 5-2 are respectively located on both sides of the metering bucket adjustment limit plate 5-1; the pair of metering bucket adjustment bolts 5-2 are both spirally matched with the support frame 3-1, so that when the metering bucket adjustment bolts 5-2 are rotated, the distance between the corresponding side surfaces of the metering bucket adjustment limit plate 5-1 can be changed, thereby changing the flipping angle of the metering bucket 3-5.

[0091] The other technical features of this embodiment are exactly the same as those of embodiment seven.

[0092] Specifically, the metering bucket 3-5 measures the rainwater to ensure that the amount of rainwater that triggers each flip is consistent, so that the number of rainwater counting signals generated by the subsequent counting bucket 3-6 is accurate. When it is determined that the rain gauge is inaccurate, it is very likely that there is a problem with the metering bucket 3-5. Therefore, the metering bucket adjustment device can be used to adjust the flip angle of the metering bucket 3-5 to ensure that the amount of water required for each flip of the metering bucket is close to the theoretical value.

[0093] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features of the various dependent claims and herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in conjunction with the individual embodiments may be used in other embodiments.

Claims

1. A counting and measuring device for a rain gauge, characterized in that: It comprises a counting unit (1-1), a comparison unit (1-2), a display unit (1-3), a trigger unit (1-4) and a simulated rainwater quantitative container (2); The water quantity counting signal input end of the counting unit (1-1) can be electrically connected to the water quantity counting signal output end of the rain gauge; The simulated rainwater quantitative container (2) is a transparent container, the bottom of which is provided with a water outlet, and the side wall of which is provided with scales; the simulated rainwater quantitative container (2) can be fixed above the inlet of the water collecting funnel (3-9) of the rain gauge; The counting output terminal of the counting unit (1-1) is electrically connected to the counting display signal input terminal of the display unit (1-3); The counting output terminal of the counting unit (1-1) is also electrically connected to the counting input terminal of the comparison unit (1-2); The trigger signal output terminal of the trigger unit (1-4) is electrically connected to the count termination signal input terminal of the counting unit (1-1); The counting unit (1-1) can terminate counting after receiving the trigger signal and send the current count as the final count to the comparing unit (1-2); The comparison unit (1-2) is capable of comparing the final count with a pre-stored expected count after receiving the final count; and generating an alarm message after the difference between the final count and the expected count exceeds a set error threshold; The alarm information output terminal of the comparison unit (1-2) is electrically connected to the alarm information display signal input terminal of the display unit (1-3).

2. The counting and measuring device for a rain gauge according to claim 1, characterized in that: Also includes a counting device housing (1-5); The counting unit (1-1) and the comparing unit (1-2) are both fixed in the counting device housing (1-5); The display unit (1-3) and the trigger unit (1-4) are both arranged on the outer side wall of the counting device housing (1-5).

3. The counting and measuring device for a rain gauge according to claim 2, characterized in that: Also included is a battery compartment (1-6); The battery compartment (1-6) is arranged inside the counting device housing (1-5), and a battery compartment opening is provided at a corresponding position between the side wall of the counting device housing (1-5) and the battery compartment (1-6).

4. The counting and measuring device for a rain gauge according to claim 3, characterized in that: The rain gauge comprises a support frame (3-1) and a device fixing seat (3-2); The device fixing seat (3-2) is fixed on the supporting frame (3-1); The device fixing seat (3-2) is a hollow shell with an opening on the side wall, and the opening matches the counting device shell (1-5), so that the counting device shell (1-5) can be inserted into the opening and fixed to the support frame (3-1) through the device fixing seat (3-2).

5. The counting and measuring device for a rain gauge according to claim 4, characterized in that: It also includes a socket (1-8) and a plug (1-7) adapted to the socket (1-8); The jack (1-8) is fixed on the support frame (3-1) and is located in the device fixing seat (3-2), and the jack (1-8) is electrically connected to the water volume counting signal output end of the rain gauge; The plug (1-7) is fixed to the outer side wall of the counting device housing (1-5), and the plug (1-7) is electrically connected to the water volume counting signal input end of the counting unit (1-1); by inserting the plug (1-7) into the socket (1-8), the water volume counting signal input end of the counting unit (1-1) is electrically connected to the water volume counting signal output end of the rain gauge.

6. The counting and measuring device for a rain gauge according to claim 4, characterized in that: The rain gauge also includes an upper tipping bucket (3-3), a collecting funnel (3-4), a metering tipping bucket (3-5), a counting tipping bucket (3-6), a reed switch (3-7) and a pair of magnetic steels (3-8); The water collecting funnel (3-9) is fixed on the supporting frame (3-1); The upper tipping bucket (3-3) is rotatably matched with the support frame (3-1) via a first rotating shaft and is located below the water collecting funnel (3-9); so that when one end of the upper tipping bucket (3-3) is tilted, the tilted end can be located at the outlet of the water collecting funnel (3-9); The collecting funnel (3-4) is fixed on the supporting frame (3-1) and is located below the upper tipping bucket (3-3); The metering bucket (3-5) is rotatably matched with the support frame (3-1) via a second rotating shaft and is located below the collecting funnel (3-4); when one end of the metering bucket (3-5) is tilted, the tilted end can be located at the outlet of the collecting funnel (3-4); The counting bucket (3-6) is rotatably matched with the support frame (3-1) via a third rotating shaft and is located below the metering bucket (3-5); the two ends of the counting bucket (3-6) correspond to the two ends of the metering bucket (3-5); The reed switch (3-7) is fixed on the support frame (3-1), and the switch signal output ends at both ends of the reed switch (3-7) are used as water volume counting signal output ends of the rain gauge; The pair of magnetic steels (3-8) are respectively fixed at the two ends of the counting bucket (3-6), so that when either end of the counting bucket (3-6) is tilted, the switch signal output end corresponding to the reed switch (3-7) can sense the magnetic steel (3-8) at the tilted end and output a water volume counting signal.

7. The counting and measuring device for a rain gauge according to claim 6, characterized in that: The rain gauge also includes an upper tipping bucket adjustment device; The upper dump bucket adjustment device comprises an upper dump bucket adjustment limit plate (4-1) and a pair of upper dump bucket adjustment bolts (4-2); The upper dump bucket adjustment limit plate (4-1) is located on the mirror symmetry plane of the upper dump bucket (3-3) and is fixed to the upper dump bucket (3-3); The pair of upper bucket adjustment bolts (4-2) are respectively located on both sides of the upper bucket adjustment limit plate (4-1); the pair of upper bucket adjustment bolts (4-2) are both screw-matched with the support frame (3-1), so that when the upper bucket adjustment bolts (4-2) rotate, the distance between the upper bucket adjustment bolts (4-2) and the corresponding side surfaces of the upper bucket adjustment limit plate (4-1) can be changed, thereby changing the turning angle of the upper bucket (3-3).

8. The counting and measuring device for a rain gauge according to claim 6 or 7, characterized in that: The rain gauge also includes a metering tipping bucket adjustment device; The metering tipping bucket adjustment device comprises a metering tipping bucket adjustment limit plate (5-1) and a pair of metering tipping bucket adjustment bolts (5-2); The metering bucket adjustment limit plate (5-1) is located on the mirror symmetry plane of the metering bucket (3-5) and is fixed to the metering bucket (3-5); The pair of metering bucket adjustment bolts (5-2) are respectively located on both sides of the metering bucket adjustment limit plate (5-1); the pair of metering bucket adjustment bolts (5-2) are both screw-matched with the support frame (3-1), so that when the metering bucket adjustment bolts (5-2) rotate, the distance between the corresponding side surfaces of the metering bucket adjustment limit plate (5-1) can be changed, thereby changing the turning angle of the metering bucket (3-5).

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