CN109060438B - Control system of electric sampler - Google Patents
Control system of electric sampler Download PDFInfo
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- CN109060438B CN109060438B CN201811004885.7A CN201811004885A CN109060438B CN 109060438 B CN109060438 B CN 109060438B CN 201811004885 A CN201811004885 A CN 201811004885A CN 109060438 B CN109060438 B CN 109060438B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
Abstract
The embodiment of the application discloses control system of electronic skewer ware includes: the system comprises a main control unit, an operation control module and a grain suction control module; the operation control module and the grain suction control module are in communication connection with the main control unit; the operation control module is connected with a sampling pipe of the sampler; the grain suction control module is connected with the sampler; the main control unit is used for triggering the operation control module to operate in a descending working state when a sampling start instruction input by an operator is received, so that the operation control module drives the sampling pipe to descend to the preset sampling depth of the granary; the main control unit is also used for triggering the grain suction control module when the sampling pipe descends to the preset sampling depth, so that the grain suction control module controls the sampling device to suck grains in the granary. The control system of having solved current electronic skewer ware leads to the life of skewer ware shorter because of the automation level is lower, has the technical problem of higher physical demands to operating personnel simultaneously.
Description
Technical Field
The application relates to the technical field of agriculture, especially, relate to a control system of electronic skewer ware.
Background
With the development of agricultural technologies and the improvement of living demands of people, crops such as grains accumulated in a granary are often required to be sampled, and relevant quality data are acquired after inspection.
At present, the electric sampler is generally used for sampling grain, but the automatic level of a control system of the conventional electric sampler is low, so that when the sampler needs sampling at a certain specified depth in a granary, the sampler is always in a grain suction state from the top of the granary to the specified depth of the granary in the whole process, the sampler is in an invalid working state for a long time, and the effective service life of the sampler is influenced. Meanwhile, the operating personnel is required to apply external force to the sampling tube of the sampler in the descending process of the sampler, so that the sampling tube can continuously descend, and the operating personnel has higher physical requirements.
Disclosure of Invention
The embodiment of the application provides a control system of electronic skewer ware for control the descending grain of inhaling of electronic skewer ware, the control system who solves current electronic skewer ware leads to the life cycle of skewer ware shorter because of the automation level is lower, has the technical problem of higher physical demands to operating personnel simultaneously.
In view of this, the first aspect of the present application provides a control system of an electric sampler, comprising: the system comprises a main control unit, an operation control module and a grain suction control module;
the operation control module and the grain suction control module are in communication connection with the main control unit;
the operation control module is connected with a sampling pipe of the sampler;
the grain suction control module is connected with the sampler;
the main control unit is used for triggering the operation control module to operate in a descending working state when a sampling start instruction input by an operator is received, so that the operation control module drives the sampling pipe to descend to a preset sampling depth of the granary;
the main control unit is further used for triggering the grain suction control module when the sampling tube descends to the preset sampling depth, so that the grain suction control module controls the sampler to suck grains in the granary.
Preferably, the operation control module specifically includes: a drive assembly and a first detection unit;
the driving assembly and the first detection unit are both in communication connection with the main control unit;
the driving assembly and the first detection unit are both connected with the sampling tube;
when the operation control module works in a descending working state, the driving module is used for driving the sampling tube to descend in the granary, and the first detection unit is used for detecting the first descending depth of the sampling tube in the granary in real time and sending the first descending depth to the main control unit;
the main control unit is further used for judging whether the first descending depth is equal to a preset sampling depth or not, and if yes, the operation control module is controlled to stop working.
Preferably, the drive assembly comprises: a rotating device, a first motor and a second motor;
the rotating device is connected with the sampling tube;
the first motor and the second motor are both connected with the rotating device;
when the operation control module works in a downlink working state, the first motor drives the rotating device to rotate positively, and the second motor drives the rotating device to move downwards along a guide rail arranged in the granary.
Preferably, the system further comprises a second detection unit;
the second detection unit is in communication connection with the main control unit;
when the operation control module works in a descending working state, the second detection unit is used for detecting a second descending depth between the rotating device and the surface of the grain pile in the granary in real time, the main control unit is also used for judging whether the second descending is not greater than a preset limit distance, and if so, judging whether the first descending depth is equal to a preset sampling depth.
Preferably, the system further comprises: a third detection unit and a buzzer;
the third detection unit and the buzzer are both in communication connection with the main control unit;
the third detection unit is used for detecting a first spacing between the rotating device and the sampling tube and sending the first spacing to the main control unit;
the main control unit is further used for judging whether the first distance is larger than a preset installation distance, and if so, the buzzer is triggered to send an alarm signal.
Preferably, the system further comprises: a display screen;
the display screen is in communication connection with the main control unit;
and the display screen is used for displaying the alarm signal.
Preferably, the main control unit is further configured to trigger the operation control module to work in an uplink working state after the grain suction control module finishes grain suction, so that the operation control module drives the sampling tube to move upwards to an initial height.
Preferably, when the operation control module operates in an upward operating state, the first motor drives the rotating device to rotate reversely, and the second motor drives the rotating device to move upward along the guide rail.
Preferably, when the operation control module operates in an upward operating state, the second detection unit is configured to detect a first upward height between the rotating device and the surface of the grain bulk in the granary in real time, and the main control unit is further configured to determine whether the first upward height is equal to an initial height, and if so, control the operation control module to stop operating.
Preferably, the system further comprises: an upper computer;
the upper computer is in communication connection with the main control unit;
and the upper computer is used for sending a sampling start instruction input by an operator to the main control unit.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a control system of electronic skewer ware includes: the system comprises a main control unit, an operation control module and a grain suction control module; the operation control module and the grain suction control module are in communication connection with the main control unit; the operation control module is connected with a sampling pipe of the sampler; the grain suction control module is connected with the sampler; the main control unit is used for triggering the operation control module to operate in a descending working state when a sampling start instruction input by an operator is received, so that the operation control module drives the sampling pipe to descend to the preset sampling depth of the granary; the main control unit is also used for triggering the grain suction control module when the sampling pipe descends to the preset sampling depth, so that the grain suction control module controls the sampling device to suck grains in the granary. This application realizes the down drive to the skewer pipe through operation control module group, need not with the help of operating personnel's external force, just controls the skewer appearance ware and inhale grain when the skewer pipe is down to preset degree of depth department simultaneously for the effective life of skewer appearance ware is prolonged, and the control system who has solved current electronic skewer appearance ware is lower because of the automatic level, and the effective life that leads to the skewer appearance ware is shorter, has the technical problem of higher physical demands to operating personnel simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of a control system of an electric sampler in an embodiment of the present application;
wherein the reference numbers are as follows:
1. a main control unit; 3. a grain suction control module; 21. a drive assembly; 22. a first detection unit; 4. a second detection unit; 5. a third detection unit; 6. a buzzer; 7. a display screen; 8. and (4) an upper computer.
Detailed Description
The embodiment of the application provides a control system of electronic skewer ware for control the descending grain of inhaling of electronic skewer ware, the control system who solves current electronic skewer ware leads to the life cycle of skewer ware shorter because of the automation level is lower, has the technical problem of higher physical demands to operating personnel simultaneously.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic structural diagram of an embodiment of a control system of an electric sampler in an embodiment of the present application includes: main control unit 1, operation control module group and grain suction control module group 3 all with main control unit 1 communication connection, the skewer union coupling of operation control module group and skewer, grain suction control module group 3 and skewer are connected, main control unit 1, when the skewer inception instruction of receiving operating personnel input, trigger operation control module group and operate in down operating condition, make operation control module group drive the skewer pipe down to the preset skewer degree of depth department of granary, main control unit 1, still be used for when the skewer pipe is down to preset skewer degree of depth department, trigger grain suction control module group 3, make grain suction control module group 3 control the skewer to absorb the grain in the granary.
In this embodiment, realize the down drive to the skewer pipe through operation control module group, need not with the help of operating personnel's external force, just control the sampler grain uptake when the skewer pipe descends to preset degree of depth department simultaneously for the effective life of sampler becomes long, and the control system who has solved current electronic sampler is lower because of the automation level, and the effective life that leads to the sampler is shorter, has the technical problem of higher physical demands to operating personnel simultaneously.
The present application provides a second embodiment of a control system for an electric sampler, specifically referring to fig. 1, including: main control unit 1, operation control module group and grain suction control module group 3 all with main control unit 1 communication connection, the skewer union coupling of operation control module group and skewer, grain suction control module group 3 and skewer are connected, main control unit 1, when the skewer inception instruction of receiving operating personnel input, trigger operation control module group and operate in down operating condition, make operation control module group drive the skewer pipe down to the preset skewer degree of depth department of granary, main control unit 1, still be used for when the skewer pipe is down to preset skewer degree of depth department, trigger grain suction control module group 3, make grain suction control module group 3 control the skewer to absorb the grain in the granary.
Further, the operation control module specifically includes: drive assembly 21 and first detecting element 22, drive assembly 21 and first detecting element 22 all with main control unit 1 communication connection, drive assembly 21 and first detecting element 22 all with the sampling union coupling, when operation control module work in down operating condition, drive assembly 21 is used for driving the sampling pipe down in the granary, first detecting element 22 is used for the first depth of descent of real-time detection sampling pipe in the granary, and send first depth of descent to main control unit 1, still be used for judging whether first depth of descent equals preset sampling depth, if, then control operation control module stop work.
Note that, the driving unit 21 includes: rotating device, first motor and second motor, rotating device and sampling pipe connection, first motor and second motor all are connected with rotating device, and when operation control module group work in down operating condition, first motor drives the rotating device corotation, and the grain that hinders the descending of sampling pipe in with the granary is pushed open, and the second motor drives rotating device down along the guide rail that sets up in the granary to it is down to drive the sampling pipe. It will be appreciated that the rotating means is a fan blade like structure. The first detection unit 22 may be a distance sensor.
It should be noted that the rotating device may also be other structures for pushing the grains away, such as a pushing baffle plate.
Further, the system further comprises a second detection unit 4, the second detection unit 4 is in communication connection with the main control unit 1, when the operation control module works in a downlink working state, the second detection unit 4 is used for detecting the second downlink depth between the surfaces of the grain piles in the rotating device and the granary in real time, and the main control unit 1 is further used for judging whether the second downlink depth is not larger than a preset limit distance or not, and if so, judging whether the first downlink depth is equal to a preset sampling depth or not.
It should be noted that the second descending depth is smaller than the preset limit distance, which indicates that the sampling tube can also continue to descend, and at this time, it is determined whether the first descending depth is equal to the preset sampling depth.
Further, the system further comprises: third detecting element 5 and bee calling organ 6, third detecting element 5 and bee calling organ 6 all with main control unit 1 communication connection, third detecting element 5 for detect the first interval between rotary device and the sampling pipe, and send first interval to main control unit 1, still be used for judging whether first interval is greater than preset installation interval, if, then trigger bee calling organ 6, make bee calling organ 6 send alarm signal.
It should be noted that, when the main control unit 1 determines that the first distance is greater than the preset installation distance, it indicates that the connection between the rotating device and the sampling tube is disconnected, and at this time, the buzzer 6 is triggered, so that the buzzer 6 sends out an alarm signal, thereby reminding an operator of the abnormality.
Further, the system further comprises: the display screen 7, display screen 7 and main control unit 1 communication connection, display screen 7 is used for showing alarm signal.
It should be noted that, after the buzzer 6 sends out an alarm signal, the display screen 7 specifically displays the information of the abnormality, so that an operator can conveniently perform abnormality troubleshooting.
Further, main control unit 1 still is used for inhaling the grain back of accomplishing when inhaling grain control module 3, triggers operation control module work in the operating condition that goes upward for operation control module drive sampling pipe goes upward to initial height department.
It should be noted that, when the operation control module operates in the upward operating state, the first motor drives the rotating device to rotate reversely, and the second motor drives the rotating device to move upward along the guide rail. The second detection unit 4 is used for detecting the first ascending height between the surface of the grain pile in the rotating device and the granary in real time, the main control unit 1 is also used for judging whether the first ascending height is equal to the initial height, and if yes, the operation control module is controlled to stop working.
Further, the system further comprises: the upper level 8, the upper level 8 and the main control unit 1 are in communication connection, and the upper level 8 is used for sending a sampling start command input by an operator to the main control unit 1.
Further, the grain suction control module 3 comprises: the third motor is in communication connection with the main control unit 1, and specifically, the grain sucking process is that the third motor is started, so that the sampler is started to suck grains. It can be understood that the grain suction time is set in the main control unit 1, so that the sampler is controlled to suck grain according to the set grain suction time.
Furthermore, a first motor chip for driving the first motor to execute corresponding movement is arranged in the first motor. The second motor is internally provided with a second motor chip for driving the second motor to execute corresponding movement, and the third motor is internally provided with a third motor chip for driving the third motor to execute corresponding movement.
The above is a second embodiment of the control system of the electric sampler provided in the embodiment of the present application, and the following is a description of the workflow of the control system of the electric sampler provided in the embodiment of the present application.
The whole sampling process of the electric sampler control system provided by the embodiment of the application consists of a first module, a second module, a third module and three modules in total, each module consists of a plurality of sampling operation and control steps, and the following steps are described in detail:
and in the first module, the main control unit receives a sampling start instruction sent by an operator through the upper computer, sends an instruction to drive the first motor and the second motor, the second motor drives the rotating device to move downwards, and meanwhile, the first motor drives the rotating device to rotate to drive the sampling tube to rotate and descend to enter a grain pile, and then the grain pile enters the second module.
Module two, the monitoring data that second detecting element installed on rotary device feedbacks to main control unit has reached the ultimate distance of rotary device from grain layer surface, the sampling pipe depth of going down that will judge first detecting element detection, if the monitoring data that first detecting element feedbacks to main control unit has reached the sampling depth, then at this moment main control unit control first motor, the second motor stops, rotary device stop rotating thereupon on the rotary device, and rotary device stops to move down along the guide rail, main control unit sends out instruction third motor after that, make the sampling machine start to absorb sample grain and sample, the sampling time of sampling machine inhaling grain has been set for in main control unit, after having reached the interior setting time of main control unit, the third motor stops.
And a third module, after grain suction is stopped, the main control unit controls the first motor to drive the rotating device to rotate reversely, the second motor drives the rotating device to move upwards along the guide rail, the sampling tube is taken out from the grain pile in a reverse mode until the second detection unit distance sensor feeds back the monitoring data to the controller, the rotating device reaches the initial highest position, the main control unit controls the first motor to stop, the second motor to stop, the rotating device stops, and the rotating device stops moving upwards along the guide rail.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. A control system for a motorized sampler, comprising: the system comprises a main control unit, an operation control module and a grain suction control module;
the operation control module and the grain suction control module are in communication connection with the main control unit;
the operation control module is connected with a sampling pipe of the sampler;
the grain suction control module is connected with the sampler;
the main control unit is used for triggering the operation control module to operate in a descending working state when a sampling start instruction input by an operator is received, so that the operation control module drives the sampling pipe to descend to a preset sampling depth of the granary;
the main control unit is further used for triggering the grain suction control module when the sampling tube descends to the preset sampling depth, so that the grain suction control module controls the sampler to suck grains in the granary;
the operation control module specifically comprises: a drive assembly and a first detection unit;
the driving assembly and the first detection unit are both in communication connection with the main control unit;
the driving assembly and the first detection unit are both connected with the sampling tube;
when the operation control module works in a descending working state, the driving module is used for driving the sampling tube to descend in the granary, and the first detection unit is used for detecting the first descending depth of the sampling tube in the granary in real time and sending the first descending depth to the main control unit;
the main control unit is further configured to determine whether the first descending depth is equal to a preset sampling depth, and if so, control the operation control module to stop working;
the drive assembly includes: a rotating device, a first motor and a second motor;
the rotating device is connected with the sampling tube;
the first motor and the second motor are both connected with the rotating device;
when the operation control module works in a downward working state, the first motor drives the rotating device to rotate forward, and the second motor drives the rotating device to move downward along a guide rail arranged in the granary;
the system further comprises a second detection unit;
the second detection unit is in communication connection with the main control unit;
when the operation control module works in a descending working state, the second detection unit is used for detecting a second descending depth between the rotating device and the surface of the grain pile in the granary in real time, the main control unit is also used for judging whether the second descending is not greater than a preset limit distance, and if so, judging whether the first descending depth is equal to a preset sampling depth.
2. The system of claim 1, further comprising: a third detection unit and a buzzer;
the third detection unit and the buzzer are both in communication connection with the main control unit;
the third detection unit is used for detecting a first spacing between the rotating device and the sampling tube and sending the first spacing to the main control unit;
the main control unit is further used for judging whether the first distance is larger than a preset installation distance, and if so, the buzzer is triggered to send an alarm signal.
3. The system of claim 2, further comprising: a display screen;
the display screen is in communication connection with the main control unit;
and the display screen is used for displaying the alarm signal.
4. The system of claim 1, wherein the main control unit is further configured to trigger the operation control module to operate in an ascending operation state after the grain suction control module finishes grain suction, so that the operation control module drives the sampling tube to ascend to an initial height.
5. The system of claim 4, wherein when the operation control module operates in an up-travel operation state, the first motor rotates the rotating device in a reverse direction, and the second motor moves the rotating device up along the guide rail.
6. The system according to claim 5, wherein when the operation control module operates in an upward operating state, the second detection unit is configured to detect a first upward height between the rotating device and the surface of the grain bulk in the granary in real time, and the main control unit is further configured to determine whether the first upward height is equal to an initial height, and if so, control the operation control module to stop operating.
7. The system of claim 1, further comprising: an upper computer;
the upper computer is in communication connection with the main control unit;
and the upper computer is used for sending a sampling start instruction input by an operator to the main control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811004885.7A CN109060438B (en) | 2018-08-30 | 2018-08-30 | Control system of electric sampler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811004885.7A CN109060438B (en) | 2018-08-30 | 2018-08-30 | Control system of electric sampler |
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| CN109060438B true CN109060438B (en) | 2021-09-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110309977B (en) * | 2019-07-09 | 2022-11-01 | 河南工业大学 | Random grain heap sampling height layout method and silo grain heap sampling method |
| CN113686619A (en) * | 2021-08-30 | 2021-11-23 | 发达面粉集团股份有限公司 | Automatic grain sampling detection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2047374U (en) * | 1989-01-30 | 1989-11-08 | 新郑县粮食局粮油贸易公司 | Slender pointed tube type grain sampler |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU890122A1 (en) * | 1979-09-18 | 1981-12-15 | Коммунарский горно-металлургический институт | Device for loose material sampling |
| FR2643985B1 (en) * | 1989-03-03 | 1991-06-28 | Serdia | APPARATUS FOR CONTINUOUSLY MEASURING THE CONTENT OF A GRANULAR, POWDERY OR VISCOUS PRODUCT |
| CN100545623C (en) * | 2006-02-24 | 2009-09-30 | 唐丞有 | Device for sticking-in carried-on-vehicle grain for sampling |
| CN205981781U (en) * | 2016-07-04 | 2017-02-22 | 辛玉红 | Fixed grain sensing sample machine |
| CN205969074U (en) * | 2016-08-20 | 2017-02-22 | 山东长江粮油仓储机械有限公司 | Intelligence sample robot |
| CN206593901U (en) * | 2017-04-14 | 2017-10-27 | 湖南万通科技股份有限公司 | A kind of sample skewering machine |
| CN107764952A (en) * | 2017-10-12 | 2018-03-06 | 耿新宇 | Grain automatically samples chemical examination detecting system |
| CN107831727A (en) * | 2017-12-04 | 2018-03-23 | 山东浪潮通软信息科技有限公司 | A kind of method, terminal and the system that control sample skewering machine to carry out sample |
| CN108225833B (en) * | 2018-01-04 | 2023-09-26 | 广东工业大学 | Grain sampler and control method thereof |
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2018
- 2018-08-30 CN CN201811004885.7A patent/CN109060438B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2047374U (en) * | 1989-01-30 | 1989-11-08 | 新郑县粮食局粮油贸易公司 | Slender pointed tube type grain sampler |
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