CN112930812A - Device and method for monitoring blockage of fertilization system and fertilization system - Google Patents

Device and method for monitoring blockage of fertilization system and fertilization system Download PDF

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Publication number
CN112930812A
CN112930812A CN202110199220.1A CN202110199220A CN112930812A CN 112930812 A CN112930812 A CN 112930812A CN 202110199220 A CN202110199220 A CN 202110199220A CN 112930812 A CN112930812 A CN 112930812A
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China
Prior art keywords
fertilizer
pipe
fertilization
air pressure
inlet pipeline
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CN202110199220.1A
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CN112930812B (en
Inventor
曾山
魏斯龙
卢少杰
郑景富
曾力
徐卓
武玉金
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South China Agricultural University
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South China Agricultural University
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C15/00Fertiliser distributors
    • A01C15/04Fertiliser distributors using blowers
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C15/00Fertiliser distributors
    • A01C15/06Fertiliser distributors with distributing slots, e.g. adjustable openings for dosing
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C15/00Fertiliser distributors
    • A01C15/16Fertiliser distributors with means for pushing out the fertiliser, e.g. by a roller
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C5/00Making or covering furrows or holes for sowing, planting or manuring
    • A01C5/06Machines for making or covering drills or furrows for sowing or planting
    • A01C5/062Devices for making drills or furrows
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V9/00Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00

Abstract

The invention relates to a blockage monitoring device for a fertilization system, which comprises an air pressure supply system, a fertilization pipe state feedback system and a fertilization pipeline system, wherein the air pressure supply system comprises a pressure sensor, a; the tail end of the fertilization pipeline system is provided with a fertilizer funnel; the tail end of the air pressure supply system is a main air inlet pipeline; the fertilizing pipe state feedback system comprises a hard pipe, a floating ball, a distance measuring sensor and an auxiliary air inlet pipeline, wherein the distance measuring sensor, the hard pipe and the auxiliary air inlet pipeline are sequentially arranged from top to bottom; the tail end of the main air inlet pipeline extends into the fertilizer funnel. The invention also relates to a blockage monitoring method for the fertilization system and the fertilization system. The invention can effectively improve the fertilizer yield efficiency and improve the utilization effect of the fertilizer, is particularly suitable for granular solid fertilizer, and belongs to the field of agricultural machinery.

Description

Device and method for monitoring blockage of fertilization system and fertilization system
Technical Field
The invention relates to the field of agricultural machinery, in particular to a blockage monitoring device of a fertilization system, a blockage monitoring method of the fertilization system and the fertilization system.
Background
With the development of agricultural automation technology and the popularization of farming equipment, the automatic farming equipment occupies an important position in the agricultural production and planting process. In the agricultural production and planting process, fertilization is an important component and is a premise for high-quality planting of plants, but the situation that the fertilization opening is blocked due to caking easily occurs in the application process of the existing granular solid fertilizer, so that the situation is greatly uncertain, remains a lot of invariants and is not beneficial to modern agricultural production.
CN209420319U discloses a side deep fertilization controlling means for fertilizer distributor, is equipped with stifled fertile sensor in the fertilization spigot joint. The discharge hole is blocked by the fertilizer blocking sensor, so that two poles of the fertilizer blocking sensor are communicated, and an electric signal is fed back to the controller. The fertilization control device has the advantages that the sensor is easy to fail, and the fertilization control device is not suitable for granular solid fertilizers.
Therefore, a monitoring device is needed, the fertilizer outlet condition of the fertilization pipeline is monitored in real time, the fertilizer outlet efficiency is improved, and the utilization effect of the fertilizer is improved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the device and the method for monitoring the blockage of the fertilizing system can accurately monitor the fertilizer output condition.
Another object of the invention is: the fertilization system can accurately monitor the fertilization situation, so that the fertilization efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a blockage monitoring device for a fertilization system comprises an air pressure supply system, a fertilization pipe state feedback system and a fertilization pipeline system; the tail end of the fertilization pipeline system is provided with a fertilizer funnel; the tail end of the air pressure supply system is a main air inlet pipeline; the fertilizing pipe state feedback system comprises a hard pipe, a floating ball, a distance measuring sensor and an auxiliary air inlet pipeline, wherein the distance measuring sensor, the hard pipe and the auxiliary air inlet pipeline are sequentially arranged from top to bottom; the tail end of the main air inlet pipeline extends into the fertilizer funnel.
Preferably, the fertilizing pipe state feedback system further comprises a fixed support and a sensor protection plate; hard tube and vice admission line all fix on the fixed bolster, and the sensor guard plate is installed on the fixed bolster, and the range sensor setting of measuring the floater position is in the sensor guard plate.
Preferably, the hard pipe is a straight pipe which is vertically arranged, the upper end of the auxiliary air inlet pipeline is communicated with the lower end of the hard pipe, and the lower end of the auxiliary air inlet pipeline is communicated with the interior of the main air inlet pipeline.
Preferably, the fertilization pipeline system comprises a fertilizer funnel, a fertilization pipe, a fertilizer funnel bracket, a clamp and a machine frame; the upper end of the fertilizing pipe is connected with the fertilizer distributor, the lower end of the fertilizing pipe is connected with the upper end of the fertilizer funnel, the lower end of the fertilizer funnel discharges materials, and the fertilizer funnel is installed on the rack through a fertilizer funnel support; the main air inlet pipeline extends into the fertilizer hopper from one side of the fertilizer hopper, and the clamp for fixing the main air inlet pipeline is located on one side of the fertilizer hopper.
Preferably, the fertilizer funnel comprises a funnel section located above and a straight pipe section located below, the cross section of the funnel section is sequentially reduced from top to bottom, and the main air inlet pipeline penetrates through the funnel section and extends into the straight pipe section.
Preferably, the air pressure supply system comprises an air pump, a pneumatic quick connector, an air pipe and a main air inlet pipeline which are connected in sequence.
Preferably, an outlet valve of the air pump is connected with a pneumatic quick connector, the air pump is provided with an air pressure adjusting knob so that the air pump outputs air with different pressures, the air pipe is connected with the pneumatic quick connector in a sealing mode, and the end portion of the air pipe is sleeved with the end portion of the main air inlet pipeline.
A fertilization system blockage monitoring method adopts a fertilization system blockage monitoring device, constant air pressure is input into an air pressure supply system through a main air inlet pipeline, three conditions of blockage, normal fertilization and application omission exist in the outlet of a fertilization pipe for fertilizer, and three change modes of air pressure in a hard pipe are correspondingly formed through the change of the air pressure of an auxiliary air inlet pipeline; the height position of the floating ball is measured by the distance measuring sensor, and whether the fertilizing system is in a normal working state or not is determined.
Preferably, the position of the floating ball is changed due to the air pressure in the fertilizer funnel and the fertilizing tube, and the air pressure in the hard tube is changed due to the air pressure in the fertilizer funnel and the fertilizing tube; when the fertilizer application pipe is blocked, the air pressure in the fertilizer funnel is rapidly increased, so that the air pressure in the hard pipe is increased, and the position of the floating ball at the upper end of the hard pipe is changed; when the fertilizing pipe is in a normal fertilizer discharging condition, the change of the internal air pressure of the fertilizer funnel is small, so that the change of the air pressure in the hard pipe is not large, and the position of the floating ball is changed in the middle of the hard pipe; when the fertilizer applying pipe is in a leakage applying condition, the air pressure in the fertilizer funnel is reduced, so that the air pressure in the hard pipe is smaller, and the position of the floating ball is partially changed at the lower end of the hard pipe.
A fertilization system comprises a plurality of fertilization system blockage monitoring devices, wherein the fertilization system blockage monitoring devices are arranged in one-to-one correspondence with furrow openers; each set of air pressure supply system comprises an air pump, or all the air pressure supply systems are supplied with air by the air pump through a multi-way joint.
The principle of the invention is as follows: a blockage monitoring device for a fertilization system comprises three subsystems, namely an air pressure supply system, a fertilization pipe state feedback system and a fertilization pipeline system, wherein three different change modes of the air pressure in a hard pipe can be caused by three fertilization conditions of a variable cross-section pipe diameter of a fertilizer funnel and a fertilization pipe. And then the distance measuring sensor measures different positions of the floating ball, and the fertilizer outlet condition at the fertilizing pipe is monitored in real time. The theory of operation is clear, records the different positions of floater through the sensor, and then judges out fertile condition in real time, avoids at the fertilization operation in-process, and the condition that the pipe that fertilizies appears and block up and be unknown accords with the green development trend of low cost, has improved out fertile efficiency, has promoted the utilization effect of fertilizer.
The invention has the following advantages:
1. can effectively improve the fertilizer efficiency and improve the utilization effect of the fertilizer.
2. Mainly aiming at the situation that the fertilizer discharge pipe is blocked due to the caking of the granular solid fertilizer in the application process, the blockage can be timely monitored, and the phenomenon of missed application is prevented.
3. Simple structure, easy to use, easy to maintain.
4. The main air inlet pipeline is arranged in the fertilizer funnel with the variable cross section, and the fertilizing pipe state feedback system can rapidly respond to the air pressure change condition in the fertilizer funnel.
5. And a clamp structure is adopted, so that the reliable connection of the main air inlet pipeline and the fertilizer hopper is ensured.
6. The field working environment is complex, and the anti-interference performance and the stability of the device can be greatly improved by adopting an air pressure pipeline structure.
7. A plurality of sets of fertilizer application system blockage monitoring devices can be arranged side by side according to the operation width of the fertilizer application machinery.
Drawings
Fig. 1 is a perspective view of a fertilization system blockage monitoring device.
Fig. 2 is a perspective view of the air pressure supply system.
Fig. 3 is a perspective view of the fertilization tube state feedback system.
Fig. 4 is a perspective view of the fertilization tubing system.
Fig. 5 is a partial enlarged view of the fertilizer funnel.
Wherein, 1 is the atmospheric pressure supply system, 2 is the feedback system of fertilization pipe state, 3 is fertilization pipe system, 4 is the fertilizer apparatus, 5 is the fertilizer case, 6 is the furrow opener.
11 is an air pump, 12 is an air pump pressure gauge, 13 is an air pump motor, 14 is an air pump valve port pressure gauge, 15 is an air pressure adjusting knob, 16 is a pneumatic quick connector, 17 is an air pipe, 18 is a main air inlet pipeline, and 19 is an air pump fixing support.
21 is an auxiliary air inlet pipeline, 22 is a fixed support, 23 is a hard pipe, 24 is a floating ball, 25 is a sensor protection plate, and 26 is a distance measuring sensor.
31 is a fertilizing tube, 32 is a fertilizer funnel bracket, 33 is a fertilizer funnel, 34 is a frame, and 35 is a hoop.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example one
A blockage monitoring device for a fertilization system comprises three subsystems, namely an air pressure supply system, a fertilization pipe state feedback system and a fertilization pipeline system.
The air pressure supply system comprises an air pump, a pneumatic quick connector, an air pipe and a main air inlet pipeline. The air pump of air pressure supply system installs in the frame, and the outlet valve of air pump is connected with pneumatic quick-operation joint, and pneumatic quick-operation joint is connected with trachea one end, and the tracheal other end is connected with main admission line. The air pump is driven to output air with constant air pressure to the air pipe, and then the air pipe transmits the air to the main air inlet pipeline.
The fertilizing pipe state feedback system comprises a hard pipe, a floating ball, a distance measuring sensor, an auxiliary air inlet pipeline, a fixed support and a sensor protection plate. The auxiliary air inlet pipeline of the fertilizing pipe state feedback system is communicated with the main air inlet pipeline of the air pressure supply system, the hard pipe is communicated with the auxiliary air inlet pipeline, and the floating ball is located inside the hard pipe. The distance measuring sensor measures different positions of the floating ball and determines whether the fertilizing system is in a normal working state.
The fertilization pipeline system comprises a fertilization pipe, a fertilizer funnel support, a clamp and a rack. The upper end of a fertilizing pipe of the fertilizing pipeline system is connected with the fertilizer distributor, and the lower end of the fertilizing pipe is connected with the furrow opener, so that fertilizer can be applied to the fertilizing ditch. According to the situation that the fertilization pipe appears, there are three kinds of situations of normal fertilization, jam, hourglass and exert, through the variable cross section pipe diameter of fertilizer funnel, three kinds of situations can form three kinds of different variation modes of hard tube internal gas pressure, record the different positions of floater by range sensor again to the play fertile condition of real-time supervision fertilization pipeline department.
In this embodiment, the main air inlet pipe, the auxiliary air inlet pipe and the hard pipe have similar pipe diameters, and have an outer diameter of 8mm and an inner diameter of 6 mm. The main intake duct and the auxiliary intake duct are responsible for the delivery of compressed air. The cross section of the upper end of the hard tube is disconnected and unsealed, and is communicated with the atmospheric pressure. The fertilizing pipe is responsible for the discharge of granular fertilizer, and the fertilizing pipe and the upper end of the fertilizer funnel are hermetically installed.
The air pump 11 of the air pressure supply system 1 is fixedly arranged on an air pump fixing support 19 and is connected with an air pipe 17 through a pneumatic quick connector 16, the air pipe 17 is connected with a main air inlet pipeline 18, the main air inlet pipeline 18 is communicated with the interior of a fertilizer funnel 33 from the funnel wall, an auxiliary air inlet pipeline 21 is fixedly connected with the main air inlet pipeline 18, after the air pump 11 is started, air is compressed by the air pump 11 and is conveyed to the air pipe 17 at a certain air pressure and further conveyed to the main air inlet pipeline 18, and as the main air inlet pipeline 18, the auxiliary air inlet pipeline 21, a hard pipe 23 and the fertilizer funnel 33 are communicated, the fertilizer funnel 33 and the main air inlet pipeline 18 have variable cross-section pipe diameters, when fertilizer is at a fertilizer applying opening, three conditions of normal fertilizer application, blockage and leakage application can be formed, and three different variation modes of the air pressure in the hard pipe 23 can be formed through the variable cross-.
A fertilization system blockage monitoring method, when the fertilization pipe is blocked, the air pressure in a fertilizer funnel 33 is rapidly increased, so that the air pressure in a hard pipe 23 is increased, and the position of a floating ball 24 at the upper end of the hard pipe is changed; when the fertilizing pipe is in a normal fertilizer discharging condition, the change of the air pressure in the fertilizer hopper 33 is small, so that the change of the air pressure in the hard pipe 23 is small, and the position of the floating ball 24 in the middle of the hard pipe changes; when the fertilizer application pipe is in a fertilizer leakage condition, the air pressure in the fertilizer funnel 33 is reduced, so that the air pressure in the hard pipe 23 is smaller, and the position of the floating ball 24 at the lower end part of the hard pipe changes; and then the different positions of the floating ball 24 are measured by the distance measuring sensor 26, whether the fertilization system is in a normal working state or not is determined, and the fertilization condition at the fertilizer discharge pipeline is monitored in real time.
Example two
A fertilization system comprises a plurality of fertilization system blockage monitoring devices in the first embodiment, the fertilization system blockage monitoring devices are arranged in one-to-one correspondence with furrow openers, and the furrow openers are arranged in a row.
Each set of air pressure supply system comprises an air pump.
The upper end of the fertilizing pipe is connected with a fertilizer distributor, and the upper end of the fertilizer distributor is connected with a fertilizer box. The lower end of the fertilizer funnel is connected with a pipeline on the furrow opener through a smooth pipeline.
The embodiment is not described in the first embodiment.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. The utility model provides a fertilization system blocks up monitoring devices which characterized in that: comprises an air pressure supply system, a fertilizing pipe state feedback system and a fertilizing pipeline system; the tail end of the fertilization pipeline system is provided with a fertilizer funnel; the tail end of the air pressure supply system is a main air inlet pipeline; the fertilizing pipe state feedback system comprises a hard pipe, a floating ball, a distance measuring sensor and an auxiliary air inlet pipeline, wherein the distance measuring sensor, the hard pipe and the auxiliary air inlet pipeline are sequentially arranged from top to bottom; the tail end of the main air inlet pipeline extends into the fertilizer funnel.
2. A fertilization system blockage monitoring device as recited in claim 1, wherein: the fertilizing tube state feedback system also comprises a fixed support and a sensor protection plate; hard tube and vice admission line all fix on the fixed bolster, and the sensor guard plate is installed on the fixed bolster, and the range sensor setting of measuring the floater position is in the sensor guard plate.
3. A fertilization system blockage monitoring device as recited in claim 2, wherein: the hard tube is a straight tube which is vertically arranged, the upper end of the auxiliary air inlet pipeline is communicated with the lower end of the hard tube, and the lower end of the auxiliary air inlet pipeline is communicated with the interior of the main air inlet pipeline.
4. A fertilization system blockage monitoring device as recited in claim 1, wherein: the fertilization pipeline system comprises a fertilizer funnel, a fertilization pipe, a fertilizer funnel bracket, a clamp and a rack; the upper end of the fertilizing pipe is connected with the fertilizer distributor, the lower end of the fertilizing pipe is connected with the upper end of the fertilizer funnel, the lower end of the fertilizer funnel discharges materials, and the fertilizer funnel is installed on the rack through a fertilizer funnel support; the main air inlet pipeline extends into the fertilizer hopper from one side of the fertilizer hopper, and the clamp for fixing the main air inlet pipeline is located on one side of the fertilizer hopper.
5. A fertilization system blockage monitoring device as recited in claim 4 wherein: the fertilizer funnel includes the straight tube section that is located the funnel section of top and is located the below, and the cross section of funnel section down reduces from last in proper order, and main admission line passes the funnel section, extends in the straight tube section.
6. A fertilization system blockage monitoring device as recited in claim 1, wherein: the air pressure supply system comprises an air pump, a pneumatic quick connector, an air pipe and a main air inlet pipeline which are connected in sequence.
7. A fertilization system blockage monitoring device as recited in claim 6, wherein: the outlet valve of air pump is connected with pneumatic quick-operation joint, and the air pump is equipped with gas pressure adjust knob to make the air pump output the gas of different pressures, trachea and pneumatic quick-operation joint sealing connection, tracheal tip and main admission line's tip cup joint.
8. A fertilization system blockage monitoring method using the fertilization system blockage monitoring device according to any one of claims 1 to 7, wherein: the constant air pressure is input into the air pressure supply system through the main air inlet pipeline, the fertilizer is blocked, normally fertilized and leaked in the outlet of the fertilizing pipe, and three changing modes of the air pressure in the hard pipe are correspondingly formed through the change of the air pressure of the auxiliary air inlet pipeline; the height position of the floating ball is measured by the distance measuring sensor, and whether the fertilizing system is in a normal working state or not is determined.
9. A fertilization system blockage monitoring method as recited in claim 8, wherein: the position of the floating ball is changed due to the air pressure in the fertilizer funnel and the fertilizing pipe, and the air pressure in the hard pipe is changed due to the air pressure in the fertilizer funnel and the fertilizing pipe; when the fertilizer application pipe is blocked, the air pressure in the fertilizer funnel is rapidly increased, so that the air pressure in the hard pipe is increased, and the position of the floating ball at the upper end of the hard pipe is changed; when the fertilizing pipe is in a normal fertilizer discharging condition, the change of the internal air pressure of the fertilizer funnel is small, so that the change of the air pressure in the hard pipe is not large, and the position of the floating ball is changed in the middle of the hard pipe; when the fertilizer applying pipe is in a leakage applying condition, the air pressure in the fertilizer funnel is reduced, so that the air pressure in the hard pipe is smaller, and the position of the floating ball is partially changed at the lower end of the hard pipe.
10. A fertilization system, comprising: the system comprises a plurality of sets of fertilization system blockage monitoring devices as set forth in any one of claims 1-7, wherein the fertilization system blockage monitoring devices are arranged in one-to-one correspondence with the furrow openers; each set of air pressure supply system comprises an air pump, or all the air pressure supply systems are supplied with air by the air pump through a multi-way joint.
CN202110199220.1A 2021-02-22 2021-02-22 Device and method for monitoring blockage of fertilization system and fertilization system Active CN112930812B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03103110A (en) * 1989-09-18 1991-04-30 Iseki & Co Ltd Apparatus for detecting clogging of fertilizing and sowing machine
JP2001275417A (en) * 2000-03-30 2001-10-09 Iseki & Co Ltd Alarm device for farm working machine
CN202547850U (en) * 2012-05-05 2012-11-21 四川科伦药业股份有限公司 Air pressure detection device
CN103181261A (en) * 2011-12-28 2013-07-03 中国农业科学院农田灌溉研究所 Fertilization tank for micro-irrigation system
CN203505006U (en) * 2013-10-17 2014-04-02 山东省农业机械科学研究院 Automatic monitoring and dredging system for fertilizing pipe of planter
CN205537480U (en) * 2016-02-03 2016-08-31 昆山钜全金属工业有限公司 Plane degree short -term test equipment is followed to closed shell mouth
CN106538118A (en) * 2016-10-25 2017-03-29 江苏省农业科学院 A kind of aspirated-air type seeding plough essence amount dispenser
CN206932628U (en) * 2017-05-22 2018-01-30 高峰 A kind of anti-blocking warning system of pneumatic fertilizer apparatus
CN209230859U (en) * 2018-12-28 2019-08-09 苏州工业园区宏斯特机电有限公司 A kind of floating ball air pressure display meter
CN209933981U (en) * 2019-03-20 2020-01-14 华中科技大学同济医学院附属协和医院 Respiratory function exercise scale
CN212082747U (en) * 2020-05-26 2020-12-04 青海盐湖工业股份有限公司 A leakproofness detection device for chemical industry device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03103110A (en) * 1989-09-18 1991-04-30 Iseki & Co Ltd Apparatus for detecting clogging of fertilizing and sowing machine
JP2001275417A (en) * 2000-03-30 2001-10-09 Iseki & Co Ltd Alarm device for farm working machine
CN103181261A (en) * 2011-12-28 2013-07-03 中国农业科学院农田灌溉研究所 Fertilization tank for micro-irrigation system
CN202547850U (en) * 2012-05-05 2012-11-21 四川科伦药业股份有限公司 Air pressure detection device
CN203505006U (en) * 2013-10-17 2014-04-02 山东省农业机械科学研究院 Automatic monitoring and dredging system for fertilizing pipe of planter
CN205537480U (en) * 2016-02-03 2016-08-31 昆山钜全金属工业有限公司 Plane degree short -term test equipment is followed to closed shell mouth
CN106538118A (en) * 2016-10-25 2017-03-29 江苏省农业科学院 A kind of aspirated-air type seeding plough essence amount dispenser
CN206932628U (en) * 2017-05-22 2018-01-30 高峰 A kind of anti-blocking warning system of pneumatic fertilizer apparatus
CN209230859U (en) * 2018-12-28 2019-08-09 苏州工业园区宏斯特机电有限公司 A kind of floating ball air pressure display meter
CN209933981U (en) * 2019-03-20 2020-01-14 华中科技大学同济医学院附属协和医院 Respiratory function exercise scale
CN212082747U (en) * 2020-05-26 2020-12-04 青海盐湖工业股份有限公司 A leakproofness detection device for chemical industry device

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