CN218778190U - Slice tobacco feeding process sieve amount metering device - Google Patents
Slice tobacco feeding process sieve amount metering device Download PDFInfo
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- CN218778190U CN218778190U CN202222869889.XU CN202222869889U CN218778190U CN 218778190 U CN218778190 U CN 218778190U CN 202222869889 U CN202222869889 U CN 202222869889U CN 218778190 U CN218778190 U CN 218778190U
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 241000208125 Nicotiana Species 0.000 title claims description 34
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims description 34
- 241000207961 Sesamum Species 0.000 claims abstract description 63
- 235000003434 Sesamum indicum Nutrition 0.000 claims abstract description 63
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 15
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000007873 sieving Methods 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000011897 real-time detection Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a reinforced process sieve weight metering device of piece cigarette, include: the vibrating conveyor is positioned at the rear end of the vibrating screening machine and at the front end of the belt conveyor, the rear end of the belt conveyor is connected to an outlet of the leaf moistening feeding roller, and the top of the middle position of the vibrating conveyor is provided with a plurality of Doppler radar sensors connected to the input end of an industrial personal computer and used for sending microwaves to sesame pieces on the vibrating conveyor and receiving the reflected microwaves so as to obtain frequency change signals between return waves and emitted waves; the industrial personal computer is used for obtaining the real-time mass flow and the accumulated mass of the sesame slices according to the frequency change signals corresponding to the Doppler radar sensors. The utility model provides a reinforced process sieve weight metering device of piece cigarette has realized the instantaneous mass flow and the accumulative mass that contactless can real-time detection sesame piece through Doppler radar sensor, has compensatied the unable defect of carrying out the measurement statistics to the reinforced process sieve weight of piece cigarette of existing equipment.
Description
Technical Field
The utility model relates to a tobacco processing equipment technical field especially relates to a reinforced process sieve weight metering device of piece cigarette.
Background
The tobacco leaf moistening and feeding process is one of the important processes in cigarette production, and the application of the feed liquid plays an important role in exerting the potential of tobacco leaf raw materials and improving the sensory quality of cigarette products. The tobacco leaves are inevitably broken in the processes of transportation, storage and processing, so that a certain amount of broken tobacco flakes and tobacco powder are generated in the tobacco flakes after loosening and moisture regaining. The small-sized tobacco flakes (namely, sesame flakes) are easy to adhere to the inner wall of the roller when the tobacco flakes are moistened and fed, so that the heat transfer efficiency is influenced, and the loss of raw materials in the processing process is increased. Therefore, a vibrating screening machine is specially installed in front of the inlet of the drum for primary feeding and secondary feeding to screen out the sesame flakes and prevent the sesame flakes from entering the feeding drum, and then the screened sesame flakes are conveyed to the outlet of the feeding drum by a vibrating conveyor and a belt conveyor to be mixed with the fed tobacco flakes. Although the adhesion amount of the feeding roller is reduced in the process, the weight of the screened sesame flakes, namely the process screening amount, cannot be measured, so that the proportion of the screened materials cannot be known. When the process sieve amount needs to be subjected to process testing, a platform needs to be temporarily built manually to collect sesame slices and weigh the sesame slices, the process is time-consuming and labor-consuming, and has great randomness and uncontrollable performance, so that the process testing result is influenced.
Therefore, a sieve amount metering device for a tobacco flake feeding process is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reinforced process sieve volume metering device of piece cigarette to solve the problem among the above-mentioned prior art, can be with the instantaneous mass flow and the accumulation quality of contactless mode but real-time detection sesame piece.
The utility model provides a reinforced process sieve weight metering device of piece cigarette, include:
the vibration conveyor is positioned at the rear end of the vibration screening machine and at the front end of the belt conveyor, the rear end of the belt conveyor is connected to the roller outlet of the moistening and feeding roller, the vibration conveyor is used for conveying sesame slices screened by the vibration screening machine to the belt conveyor and conveying the sesame slices to the roller outlet of the moistening and feeding roller through the belt conveyor so as to mix the sesame slices screened by the vibration screening machine with the leaves fed by the moistening and feeding roller, a plurality of Doppler radar sensors are arranged at the top of the middle position of the vibration conveyor, each Doppler radar sensor is connected to the input end of an industrial personal computer, and each Doppler radar sensor is used for sending microwaves to the sesame slices on the vibration conveyor and receiving the microwaves reflected by the sesame slices so as to obtain frequency change signals between return waves and emitted waves; the industrial personal computer is used for obtaining the real-time mass flow and the accumulated mass of the sesame slices according to the frequency change signals corresponding to the Doppler radar sensors.
The device for measuring the amount of lamina material fed through a screen as described above, wherein the rear portion of the vibrating conveyor is preferably provided with a downwardly openable vibrating conveyor flap.
The device for metering the sieving amount in the feeding process of the sheet tobacco, wherein preferably, the valve of the vibration conveyor is in transmission connection with an air cylinder, the air cylinder is connected with an external air source through an air pipe, the air pipe is provided with an electromagnetic valve, the electromagnetic valve is connected with the output end of the industrial personal computer, and the industrial personal computer is used for controlling the opening and closing state of the electromagnetic valve according to the process requirements of the sesame sheet or the fault state of the belt conveyor, so as to further control the opening and closing state of the valve of the vibration conveyor.
The screen weight metering device in the feeding process of the tobacco flakes, as described above, wherein preferably, a push rod is arranged between the cylinder and the valve of the vibrating conveyor, the cylinder drives the push rod to move so as to drive the opening and closing of the valve of the vibrating conveyor through the push rod.
The screen flow metering device in the feeding process of the tobacco flakes is characterized in that each air pipe is provided with a manual ball valve for manually controlling the on-off of an air passage of the air cylinder.
The device for measuring the sieve amount in the tobacco flake feeding process is characterized in that the number of the Doppler radar sensors is 2-4.
The sifting amount measuring device for a tobacco flake charging process as described above, wherein preferably each doppler radar sensor is mounted on top of the vibrating conveyor by a bracket.
The device for measuring the screen weight in the feeding process of the tobacco flakes, as described above, wherein preferably the support is arranged above the vibrating conveyor, and the doppler radar sensors are arranged side by side on the support.
The apparatus for measuring the amount of tobacco lamina feeding process sifting amount as described above, wherein preferably each of said doppler radar sensors is mounted on said support at a height of 25cm to 35cm from the upper surface of said vibratory conveyor.
The device for measuring the sieve component in the feeding process of the tobacco flakes comprises a belt conveyor, a screen, a controller, a frequency converter, a controller and an industrial personal computer, wherein the screen is connected with the controller in a bidirectional mode, the frequency converter is arranged at a motor of the belt conveyor and used for detecting the working frequency of the motor of the belt conveyor in real time, the controller is further used for adjusting the working frequency of the motor of the belt conveyor to control the starting and stopping of the belt conveyor and adjusting the running speed of the belt conveyor.
The utility model discloses a slice cigarette feeding process sieve weight metering device, realized through Doppler radar sensor that the instantaneous mass flow and the accumulated mass of contactless ability real-time detection sesame piece, remedied the defect that current equipment can't carry out measurement statistics to slice cigarette feeding process sieve weight, need not to install additional electronic scale or other containers; the sesame slices can be flexibly discharged and collected according to the process requirements through the valve of the vibrating conveyor, and the sesame slices can also be timely discharged when the belt conveyor breaks down so as to avoid material blockage at the belt conveyor; the frequency converter can provide overcurrent, overvoltage, overload protection and the like for the motor of the belt conveyor, and also provides possibility for workers to observe the working frequency of the motor, adjust the running speed of the belt conveyor and control the start and stop of the belt conveyor in real time.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of the sieve amount measuring device in the feeding process of tobacco lamina;
FIG. 2 is a schematic structural view of a screen weight metering device in the sheet tobacco charging process provided by the present invention;
fig. 3 is a schematic view of the connection between the cylinder and the valve of the embodiment of the screen weight metering device in the feeding process of the tobacco lamina.
Description of the reference numerals: the method comprises the following steps of 1-vibrating conveyor, 2-vibrating conveyor valve, 3-bracket, 4-Doppler radar sensor, 5-cylinder, 6-push rod, 7-industrial personal computer, 8-electromagnetic valve, 9-frequency converter and 10-manual ball valve.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.
As used in this disclosure, "first", "second": and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component. When it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without having an intervening component, or may be directly connected to the other components without having an intervening component.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
As shown in fig. 1 and fig. 2, the sieve-amount metering device for the feeding process of the tobacco lamina comprises: a vibrating conveyor 1 located at the rear end of a vibrating screen classifier (not shown) and at the front end of a belt conveyor (not shown), wherein the rear end of the belt conveyor is connected to the drum outlet of a leaf moistening feeding drum (not shown), the vibrating conveyor 1 is used for conveying sesame pieces sieved by the vibrating screen classifier to the belt conveyor and conveying the sesame pieces to the drum outlet of the leaf moistening feeding drum through the belt conveyor, so that the sesame pieces sieved by the vibrating screen classifier are mixed with the leaves fed by the leaf moistening feeding drum, a plurality of Doppler radar sensors 4 are arranged at the top of the middle position of the vibrating conveyor 1, each Doppler radar sensor 4 is connected to the input end of an industrial personal computer 7, each Doppler radar sensor 4 is used for sending microwaves to the sesame pieces on the vibrating conveyor and receiving the microwaves reflected by the sesame pieces to obtain a frequency change signal between return waves and emission waves; the industrial personal computer 7 is used for obtaining the real-time mass flow and the accumulated mass of the sesame slices according to the frequency change signals corresponding to the Doppler radar sensors 4.
Wherein the number of the doppler radar sensors 4 is 2-4, for example 3, and is evenly distributed on the top of the vibrating conveyor 1. As shown in fig. 2, each doppler radar sensor 4 is mounted on the top of the vibratory conveyor 1 via a bracket 3. Specifically, the support 3 is disposed above the vibrating conveyor 1, and the doppler radar sensors 4 are disposed side by side on the support 3. The mounting height of each doppler radar sensor 4 on the support 3 is 25cm to 35cm (for example, 30 cm) from the upper surface of the vibratory conveyor 1. It should be noted that the present invention does not specifically limit the installation height, number, and distribution mode of the doppler radar sensor 4, and can be specifically set in combination with actual production.
Specifically, the instantaneous mass flow and the accumulated mass are calculated as follows:
first, the moving speed of the sesame flakes on the vibrating conveyor 1 is calculated by the following formula,
wherein v represents the moving speed of the sesame slice, C represents the light speed, f 0 Frequency of the wave representing the emission, f d Representing the frequency of the return wave, and theta represents an included angle between the direction of the signals received by the Doppler radar sensor and the movement direction of the sesame slice;
then, the instantaneous mass flow of the sesame flakes was calculated by the following formula,
wherein q is m Representing the instantaneous mass flow, p representing the density of the sesame flakesV represents the speed, A represents the instantaneous sectional area of the sesame slice on the belt conveyor, the positions of three or more points of the same section of the sesame slice are measured through the arranged Doppler radar sensor 4, and the instantaneous sectional area of the sesame slice can be calculated through integration after curve fitting;
finally, the cumulative mass of the sesame flakes was calculated by the following formula,
where m represents the accumulated mass, k represents the correction factor, and t represents the batch production time.
It should be noted that the above calculation process of the instantaneous mass flow and the accumulated mass is only an example, and the calculation process of the detected solid mass flow and the accumulated mass may refer to the prior art, and is not described herein again.
In operation, before the leaves enter the moistening and feeding roller, the leaves are screened out into smaller sesame flakes through a vibrating screen classifier, the screened sesame flakes fall into the vibrating conveyor 1 firstly and are conveyed to the belt conveyor through the vibrating conveyor, the belt conveyor conveys the sesame flakes to the outlet of the roller to be mixed with the fed leaves, and therefore the back blending of the sesame flakes can be completed while the adhesion amount of the roller is reduced. When the sesame slices pass through the vibrating conveyor 1, the Doppler radar sensor 4 detects the sesame slices, detection information is transmitted to the industrial personal computer 7, the industrial personal computer can analyze and process detection data from the Doppler radar sensor 4, instantaneous mass flow (namely instantaneous mass flow) and accumulated mass of the sesame slices can be displayed in real time, and therefore metering statistics of the sieve component in the feeding process of each batch of tobacco leaves is achieved.
From this, prior art relatively, the embodiment of the utility model provides a reinforced process sieve weight metering device of piece cigarette has realized the instantaneous mass flow and the accumulative mass that contactless can real-time detection sesame piece through doppler radar sensor, has compensatied the unable defect of carrying out measurement statistics to the reinforced process sieve weight of piece cigarette of existing equipment, need not to install electronic scale or other containers additional.
Further, the rear part of the vibrating conveyor 1 is provided with a vibrating conveyor shutter 2 which can be opened downward. Specifically, the vibrating conveyor valve 2 is in transmission connection with an air cylinder 5, the air cylinder 5 is connected with an external air source through an air pipe, an electromagnetic valve 8 is arranged on the air pipe, the electromagnetic valve 8 is connected with an output end of an industrial personal computer 7, and the industrial personal computer 7 is used for controlling the opening and closing state of the electromagnetic valve 8 according to the technological requirements of sesame slices or the fault state of the belt conveyor, and further controlling the opening and closing state of the vibrating conveyor valve 2. Therefore, the industrial personal computer 7 can also control the opening and closing of the electromagnetic valve 8, and further control the on-off of the air channel of the air cylinder 5. In some embodiments, the vibratory conveyor valve 2 is specifically configured to discharge sesame leaves carried on the vibratory conveyor when the sesame flakes do not need to be back-blended or the belt conveyor experiences a motor failure.
Furthermore, as shown in fig. 3, a push rod 6 is disposed between the cylinder 5 and the valve 2 of the vibrating conveyor, and the cylinder 5 drives the push rod 6 to move, so as to drive the valve 2 of the vibrating conveyor to open and close through the push rod 6. The utility model discloses in, the switching of jigging conveyer valve 2 is driven push rod 6 control by cylinder 5.
Further, each air pipe is further provided with a manual ball valve 10 for manually controlling the on-off of the air passage of the air cylinder 5. The utility model discloses in some embodiments, when the process requirement sesame piece does not back mix, manual ball valve 10 is opened to the accessible, makes cylinder 5 drive push rod 6 and opens jigging conveyer valve 2 to and discharge and collect the sesame piece in time.
Furthermore, the industrial personal computer 7 is also connected with a frequency converter 9 in a bidirectional manner, is arranged at the motor of the belt conveyor and is used for detecting the working frequency of the motor of the belt conveyor in real time, and the industrial personal computer 7 is also used for adjusting the working frequency of the motor of the belt conveyor so as to control the start and stop of the belt conveyor and adjust the running speed of the belt conveyor. The industrial personal computer can analyze and process the detection data from the frequency converter 9 and can also display the numerical value of the working frequency of the motor of the belt conveyor in real time.
The utility model discloses in some embodiments, if the belt conveyor that carries the sesame piece breaks down, then after converter 9 detects fault information, report fault information by industrial computer 7 to industrial computer 7 control solenoid valve 8 is opened, makes cylinder 5 drive push rod 6 and opens vibrating conveyor valve 2 of vibrating conveyor 1, in order to emit the sesame piece, in order to avoid causing the belt conveyor putty because of the sesame piece is piled up.
The utility model discloses in some embodiments, converter 9 is adjusted to accessible industrial computer 7 to the operating frequency of adjusting belt conveyor's motor, and then the operating speed of adjusting belt conveyor or opening of control belt conveyor stop. Therefore, the start-stop and running speed of the belt conveyor can be controlled through the industrial personal computer 7 and the frequency converter 9. Meanwhile, the frequency converter 9 can also provide overcurrent, overvoltage, overload protection and the like for the motor of the belt conveyor. The utility model discloses in some embodiments, still can be connected the back with converter 9 and speedtransmitter, also can obtain the transport speed of sesame piece fast.
The embodiment of the utility model provides a slice cigarette feeding process sieve weight metering device has realized through Doppler radar sensor that the instantaneous mass flow and the accumulated mass of sesame piece can real-time detection in contactless, has compensatied the defect that current equipment can't carry out measurement statistics to slice cigarette feeding process sieve weight, need not to install electronic scale or other containers additional; sesame slices can be flexibly discharged and collected according to the process requirements through a valve of the vibrating conveyor, and the sesame slices can also be discharged in time when the belt conveyor breaks down so as to avoid material blockage at the belt conveyor; the frequency converter can provide overcurrent, overvoltage, overload protection and the like for the motor of the belt conveyor, and also provides possibility for workers to observe the working frequency of the motor, adjust the running speed of the belt conveyor and control the start and stop of the belt conveyor in real time.
Thus, various embodiments of the present disclosure have been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (10)
1. The utility model provides a reinforced process sieve amount metering device of piece cigarette which characterized in that includes:
the vibration conveyor is positioned at the rear end of the vibration screening machine and at the front end of the belt conveyor, the rear end of the belt conveyor is connected to the roller outlet of the moistening and feeding roller, the vibration conveyor is used for conveying sesame slices screened by the vibration screening machine to the belt conveyor and conveying the sesame slices to the roller outlet of the moistening and feeding roller through the belt conveyor so as to mix the sesame slices screened by the vibration screening machine with the leaves fed by the moistening and feeding roller, a plurality of Doppler radar sensors are arranged at the top of the middle position of the vibration conveyor, each Doppler radar sensor is connected to the input end of an industrial personal computer, and each Doppler radar sensor is used for sending microwaves to the sesame slices on the vibration conveyor and receiving the microwaves reflected by the sesame slices so as to obtain frequency change signals between return waves and emitted waves; the industrial personal computer is used for obtaining the real-time mass flow and the accumulated mass of the sesame slices according to the frequency change signals corresponding to the Doppler radar sensors.
2. A lamina feed process sifting amount metering device as defined in claim 1 wherein the rear portion of the vibratory conveyor is provided with a vibratory conveyor flap which can be opened downwardly.
3. The device for metering the sieving amount in the feeding process of the sheet tobacco according to claim 2, wherein the valve of the vibration conveyor is in transmission connection with an air cylinder, the air cylinder is connected with an external air source through an air pipe, an electromagnetic valve is arranged on the air pipe and connected with the output end of the industrial personal computer, and the industrial personal computer is used for controlling the opening and closing state of the electromagnetic valve according to the process requirements of the sesame slices or the fault state of the belt conveyor so as to control the opening and closing state of the valve of the vibration conveyor.
4. The device for measuring the sieving amount in the feeding process of the sheet tobacco as claimed in claim 3, wherein a push rod is arranged between the cylinder and the valve of the vibrating conveyor, and the cylinder drives the push rod to move so as to drive the valve of the vibrating conveyor to open and close through the push rod.
5. The device for metering the sieving quantity in the feeding process of the tobacco lamina according to the claim 3, characterized in that each air pipe is further provided with a manual ball valve for manually controlling the on-off of the air passage of the air cylinder.
6. The tobacco lamina feeding process sieve amount metering device of claim 1 wherein the number of doppler radar sensors is 2-4.
7. The tobacco lamina feeding process sieve amount metering device of claim 1 wherein each doppler radar sensor is mounted on top of the vibratory conveyor by a bracket.
8. The tobacco lamina feeding process sieve amount metering device of claim 7 wherein the support is disposed above the vibratory conveyor and the Doppler radar sensors are disposed side-by-side on the support.
9. The tobacco lamina feeding process screen amount metering device of claim 8 wherein each doppler radar sensor is mounted on the support at a height of 25cm to 35cm from the upper surface of the vibratory conveyor.
10. The device for measuring the sieving amount in the feeding process of the tobacco lamina as claimed in claim 1, wherein the industrial personal computer is further connected with a frequency converter in a bidirectional mode, is arranged at the position of the motor of the belt conveyor and is used for detecting the working frequency of the motor of the belt conveyor in real time, and is further used for adjusting the working frequency of the motor of the belt conveyor so as to control the starting and stopping of the belt conveyor and adjust the running speed of the belt conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222869889.XU CN218778190U (en) | 2022-10-28 | 2022-10-28 | Slice tobacco feeding process sieve amount metering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222869889.XU CN218778190U (en) | 2022-10-28 | 2022-10-28 | Slice tobacco feeding process sieve amount metering device |
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| CN218778190U true CN218778190U (en) | 2023-03-31 |
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| CN202222869889.XU Active CN218778190U (en) | 2022-10-28 | 2022-10-28 | Slice tobacco feeding process sieve amount metering device |
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