CN108225719B - Agricultural material suspension speed testing device - Google Patents
Agricultural material suspension speed testing device Download PDFInfo
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- CN108225719B CN108225719B CN201810024102.5A CN201810024102A CN108225719B CN 108225719 B CN108225719 B CN 108225719B CN 201810024102 A CN201810024102 A CN 201810024102A CN 108225719 B CN108225719 B CN 108225719B
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- pipe
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- flow field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0003—Determining electric mobility, velocity profile, average speed or velocity of a plurality of particles
Abstract
The invention discloses an agricultural material suspension speed testing device which comprises a power and regulation system thereof, a flow field structure system and a testing system. The power and its regulation and control system includes centrifugal fan, fan shell, protecting net, flow field joint and frequency converter. The flow field structure system comprises grid pipes, rectifying grids, flanges, a material containing net, a lower flow stabilizing pipe, an observation pipe, an upper flow stabilizing pipe, a material blocking net, a material feeding port, a material feeding door and a material receiving plate. The test system comprises a measuring hole, a pitot tube, a wind speed sensor, an air conduit, a ruler, an observation table, a ladder, a working chair and a working table. The invention adopts an air blowing type structure, is close to the actual cleaning working condition, and is more practical in measurement. The fan is directly connected with the flow field pipeline, the pipeline structure is compact, the pressure loss is small, the direction of the air flow is not changed, the rectification grating ensures the stability of the air flow, and the measurement is more accurate. The method can be used for measuring the suspension speed of each component material after harvesting and threshing of crops such as wheat, rice, millet, buckwheat, oat, highland barley and the like.
Description
Technical Field
The invention belongs to the technical field of agricultural material aerodynamic property measurement, and relates to a test device for testing agricultural material suspension speed.
Background
The suspension speed refers to the air flow speed of the material when suspended in a vertically upward air flow. Suspension speed is an important aerodynamic parameter. The measurement of the suspension speed has important significance for researching the separation of materials by cleaning, pneumatic conveying and the like. Because of large individual variability of agricultural materials, accurate suspension speed is difficult to obtain by using theoretical calculation, and therefore, the suspension speed is generally obtained by adopting a test measurement method. Most of the existing measuring devices are air suction type, namely, negative pressure is created by a fan to enable materials to be sucked up to be suspended, and in actual working conditions, most of agricultural materials are in a positive pressure environment. The existing measuring device also has the problem of long pipelines, so that it is necessary to design an agricultural material suspension speed testing device.
Disclosure of Invention
The invention aims to provide an agricultural material suspension speed testing device with simple structure, simple and convenient operation and under a positive pressure environment.
The invention is realized by adopting the following technical scheme.
The agricultural material suspension speed testing device comprises a power and control system, a flow field structure system and a testing system. The power and regulation and control system thereof comprises a centrifugal fan, a fan shell, a protection net, a flow field joint and a frequency converter. The centrifugal fan is connected to one side of the fan shell, an air outlet of the centrifugal fan is vertically upwards, the centrifugal fan axially enters air, and a nylon protection net is covered at the air inlet. The lower end of the flow field joint is a square opening, the top end of the flow field joint is a round opening, the lower end of the flow field joint is connected with an air outlet of the fan shell, and the frequency converter is arranged on the workbench. The flow field structure system comprises grid pipes, rectifying grids, flanges, a material containing net, a lower flow stabilizing pipe, an observation pipe, an upper flow stabilizing pipe, a material blocking net, a material feeding port, a material feeding gate and a material receiving plate. The grid tube and the lower flow stabilizing tube are in a circular tube shape, the diameter of the grid tube is consistent with the upper end of the flow field joint, the observation tube is a conical tube with the upper thick and the lower thin, the diameter of the lower end of the observation tube is consistent with that of the lower flow stabilizing tube, the upper flow stabilizing tube is in a straight tube shape, and the diameter of the upper flow stabilizing tube is consistent with that of the upper end of the observation tube. The grid tube lower flow stabilizing tube, the observation tube and the upper flow stabilizing tube are connected into an integral structure by using a flange. And a rectification grating is arranged in the grating pipe, and a material containing net is arranged at the joint of the grating pipe and the lower steady flow pipe. One side of the lower part of the lower steady flow pipe is provided with a feed port, a curved surface feed gate is arranged outside the feed port, the feed gate is connected with the feed port through a hinge, and the feed gate is locked through a flat mouth hasp. And the top end of the upper stabilizing pipe is covered with a layer of material blocking net. The material receiving plate is movably arranged above the material containing net. The test system comprises a measuring hole, a pitot tube, a wind speed sensor, an air conduit, a scale, an observation table, a ladder, a working chair and a working table. The upper part of the lower flow stabilizing pipe is provided with a measuring hole, a pitot tube and a bracket are arranged at the measuring hole, an air inlet of the pitot tube is arranged in the lower flow stabilizing pipe, the air inlet is vertically downward, and the pitot tube can horizontally move through the measuring hole. The wind speed sensor is arranged in the wall of the lower steady flow pipe and below the measuring hole, and is connected with the pitot through an air conduit. The scale is established in the outside of observing the pipe, and the top of scale is connected with the upper end of observing the pipe, and the lower extreme of scale is leveled with the bottom of observing the pipe, is equipped with the observation platform in scale one side, the opposite of observing the pipe, the observation platform is equipped with ladder, work chair and work table, and the converter is arranged in on the work table.
Compared with the prior art, the invention has the following advantages: (1) The invention is different from most of the existing air suction type measuring devices, adopts an air blowing type structure, and agricultural materials are suspended under the air flow blowing, which is close to the actual cleaning working condition of the agricultural materials, and the measurement is more practical. The positive pressure airflow is easier to realize than the negative pressure airflow, and the power consumption of the positive pressure airflow is lower than that of the negative pressure airflow. (2) Different from most of the existing measuring devices, the device provided by the invention adopts the centrifugal fan to blow so as to suspend the materials, the rotating speed range of the centrifugal fan is larger than that of the axial flow fan, the wind power is strong and concentrated, and the rotating speed is regulated more accurately by using the frequency converter. The frequency converter of the device can display the rotating speed value of the fan in real time, and is convenient to adjust. (3) The fan of the device is directly connected with the flow field pipeline, the pipeline structure is compact, the pressure loss in the pipeline is small, the direction of the air flow blown out by the fan is not changed, and the flow field pipeline is internally provided with the rectification grating, so that the stability of the air flow is further ensured, the material can be uniformly suspended at a certain height, and the measurement is more accurate. (4) On the basis of measuring the flow velocity by the traditional differential pressure method, the testing system of the device can directly display the wind speed, the wind pressure, the wind quantity, the temperature and the humidity in the measured pipeline in real time, omits a middle manual conversion link, and is simpler, more convenient and quicker in measuring operation. (5) The air flow speed range of the device is higher than that of the existing measuring device, can be used for measuring the suspension speed of more agricultural materials, and can be used for measuring the suspension speed of each component material after harvesting and threshing of crops such as wheat, rice, millet, buckwheat, oat, highland barley and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic view of a material receiving plate structure according to the present invention.
In the figure: 1. a centrifugal fan, 2, a fan shell, 3, a protection net, 4, a flow field joint, 5, a frequency converter, 6, grid pipes, 7, a rectifying grid, 8, a flange, 9, a material containing net, 10, a lower stable flow pipe, 11, an observation pipe, 12, an upper stable flow pipe, 13 and a material blocking net, 14, a feed inlet, 15, a feed gate, 16, a receiving plate, 17, a measuring hole, 18, a pitot tube, 19, an air speed sensor, 20, an air conduit, 21, a scale, 22, an observation table, 23, a ladder, 24, a working chair, 25, a working table, 26 and a receiving plate handle.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to an agricultural material suspension speed testing device which comprises a power and regulation system thereof, a flow field structure system and a testing system. The power and its regulation and control system includes centrifugal fan 1, fan shell 2, protection net 3, flow field joint 4 and frequency converter 5. The flow field structure system comprises a grid pipe 6, a rectifying grid 7, a flange 8, a material containing net 9, a lower flow stabilizing pipe 10, an observation pipe 11, an upper flow stabilizing pipe 12, a material blocking net 13, a material inlet 14, a material feeding door 15 and a material receiving plate 16. The test system comprises a measuring hole 17, a pitot tube 18, a wind speed sensor 19, an air conduit 20, a ruler 21, a viewing platform 22, a ladder 23, a working chair 24 and a working table 25. The invention is vertically arranged as a whole and is a blowing type measuring device.
The power and the regulation and control system thereof are characterized in that the centrifugal fan 1 is connected to one side of the fan shell 2, the centrifugal fan 1 is used for providing wind power, the air outlet of the centrifugal fan 1 is vertical upwards, the centrifugal fan 1 is axially air-in, the nylon protection net 3 is covered at the air inlet, the nylon protection net is fixed on the fan shell 2 by adopting the bolt connection, fine sundries are prevented from being inhaled, the air flow is disturbed, the flow field pipeline is polluted, and the safety of test personnel is guaranteed. The lower extreme of flow field joint 4 is square opening, and the top is circular opening, and the lower extreme of flow field joint 4 is connected with the air outlet of fan casing 2, and converter 5 sets up on the workstation. The centrifugal fan 1 adopts a three-phase asynchronous variable-frequency speed-regulating motor, and the frequency converter 5 is used for regulating and controlling the rotating speed of the motor, so that the rotating speed of the centrifugal fan 1 is regulated and controlled, and the wind power and the air flow speed are changed.
In the flow field structure system, the grid pipe 6 and the lower flow stabilizing pipe 10 are in a circular pipe shape, the diameter of the grid pipe is consistent with the upper end of the flow field joint 4, the observation pipe 11 is a conical pipe with the upper thick and the lower thin, the diameter of the lower end of the observation pipe is consistent with the diameter of the lower flow stabilizing pipe 10, and the upper flow stabilizing pipe 12 is in a straight cylinder shape, and the diameter of the upper flow stabilizing pipe is consistent with the upper end of the observation pipe 11. The grid pipe 6 and the lower stabilizing pipe 10, the lower stabilizing pipe 10 and the observing pipe 11, and the observing pipe 11 and the upper stabilizing pipe 12 are connected into an integral structure by the flange 8. The grille pipe 7 is internally provided with a rectifying grille 7 for eliminating vortex in the airflow. The connection part of the grid tube 6 and the lower steady flow tube 10 is provided with a material containing net 9. A feed port 14 is arranged on one side of the lower part of the lower steady flow pipe 10, a curved surface feed gate 15 is arranged outside the feed port 14, the feed gate 15 is connected with the feed port 14 through a hinge, and the feed gate 15 is locked through a flat mouth hasp. The top end of the upper steady flow pipe 12 is covered with a layer of material blocking net 13 to prevent materials from rushing out of the pipeline and polluting the environment. The receiving plate 16 is movably arranged above the material containing net 9, after the test is finished, the receiving plate 16 is penetrated through the material inlet 14 by holding the receiving plate handle 26 by hand, and is arranged on the material containing net 9 for containing the material naturally falling after the test is finished, the material on the receiving plate 16 is cleaned by using the hairbrush, and then the receiving plate 16 is taken out.
In the test system, a measuring hole 17 is formed in one side of the upper part of the lower flow stabilizing pipe 10, a pitot tube 18 and a bracket are arranged at the measuring hole 17, an air inlet of the pitot tube 18 is arranged in the lower flow stabilizing pipe 10, the air inlet is vertically downward, the pitot tube 18 can horizontally move through the measuring hole 17, and the air inlet of the pitot tube 18 radially moves along the lower flow stabilizing pipe 10 to measure the air flow speeds at different positions in the lower flow stabilizing pipe. The wind speed sensor 19 is arranged in the pipe wall of the lower steady flow pipe 10 and below the measuring hole 17, and the wind speed sensor 19 is connected with the pitot tube 18 through an air conduit 20. The scale 21 is arranged on the outer side of the observation tube 11, the top end of the scale 21 is connected with the upper end of the observation tube 11, and the lower end of the scale 21 is leveled with the bottom end of the observation tube 11 for observing the material suspension height. An observation table 22 is arranged on one side of the scale 21 and opposite to the observation tube 11, and the observation table 22 is provided with a ladder 23, a working chair 24 and a working table 25, so that the working of a tester is facilitated. The frequency converter 5 is placed on the work table 25.
Claims (3)
1. The agricultural material suspension speed testing device is characterized by comprising a power and regulation system thereof, a flow field structure system and a testing system; the power and the regulation and control system thereof comprise a centrifugal fan, a fan shell, a protection net, a flow field joint and a frequency converter; the centrifugal fan is connected to one side of the fan shell, an air outlet of the centrifugal fan is vertically upwards, the centrifugal fan axially enters air, and a nylon protection net is covered at the air inlet; the lower end of the flow field joint is connected with an air outlet of the fan shell, and the frequency converter is arranged on the workbench; the flow field structure system comprises grid pipes, rectifying grids, flanges, a material containing net, a lower flow stabilizing pipe, an observation pipe, an upper flow stabilizing pipe, a material blocking net, a material feeding port, a material feeding gate and a material receiving plate; the grid pipe is connected with the lower flow stabilizing pipe, the lower flow stabilizing pipe is connected with the observation pipe, and the observation pipe is connected with the upper flow stabilizing pipe into an integral structure by using a flange; the grid pipe is internally provided with a rectifying grid, and a material containing net is arranged at the joint of the grid pipe and the lower steady flow pipe; a feeding port is arranged at one side of the lower part of the lower steady flow pipe, a curved surface feeding door is arranged outside the feeding port, the feeding door is connected with the feeding port through a hinge, and the feeding door is locked through a flat mouth hasp; the top end of the upper stabilizing pipe is covered with a layer of material blocking net, and a material receiving plate is movably arranged above the material containing net; the test system comprises a measuring hole, a pitot tube, a wind speed sensor, an air conduit, a scale, an observation table, a ladder, a working chair and a working table; a measuring hole is formed in one side of the upper part of the lower steady flow pipe, and a pitot tube and a bracket are arranged at the measuring hole; the air inlet of the Pitot tube is arranged in the lower steady flow tube, the air inlet is vertically downward, and the Pitot tube can horizontally move after penetrating through the measuring hole; the wind speed sensor is arranged in the wall of the lower steady flow pipe and below the measuring hole, and is connected with the Pitot tube through an air conduit; the scale is arranged on the outer side of the observation tube, the top end of the scale is connected with the upper end of the observation tube, the lower end of the scale is leveled with the bottom end of the observation tube, and an observation table is arranged on one side of the scale and opposite to the observation tube; the observation table is provided with a ladder, a working chair and a working table, and the frequency converter is arranged on the working table.
2. The agricultural material suspension speed testing device according to claim 1, wherein the flow field joint has a square opening at the lower end and a circular opening at the top end.
3. The agricultural material suspension speed testing device according to claim 1, wherein the grid tube and the lower flow stabilizing tube are cylindrical tubes, the diameter is consistent with the upper end of the flow field joint, the observation tube is a conical tube with the upper thick and the lower thin, the diameter of the lower end is consistent with the diameter of the lower flow stabilizing tube, and the upper flow stabilizing tube is straight and cylindrical, and the diameter of the upper flow stabilizing tube is consistent with the diameter of the upper end of the observation tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810024102.5A CN108225719B (en) | 2018-01-10 | 2018-01-10 | Agricultural material suspension speed testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810024102.5A CN108225719B (en) | 2018-01-10 | 2018-01-10 | Agricultural material suspension speed testing device |
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| Publication Number | Publication Date |
|---|---|
| CN108225719A CN108225719A (en) | 2018-06-29 |
| CN108225719B true CN108225719B (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810024102.5A Active CN108225719B (en) | 2018-01-10 | 2018-01-10 | Agricultural material suspension speed testing device |
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| Country | Link |
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| CN (1) | CN108225719B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075095B (en) * | 2021-04-01 | 2022-07-22 | 江苏大学 | Device and method for measuring suspension velocity of powder with multiple particle sizes |
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|---|---|---|---|---|
| GB1075469A (en) * | 1963-08-02 | 1967-07-12 | Kloeckner Humboldt Deutz Ag | An air classifier |
| KR200169412Y1 (en) * | 1999-08-17 | 2000-02-15 | 삼공물산주식회사 | Device for measuring airflow rate |
| CN102928616A (en) * | 2012-10-19 | 2013-02-13 | 上海烟草集团有限责任公司 | Suspended velocity testing device of materials |
| CN104865402A (en) * | 2015-05-18 | 2015-08-26 | 南京农业大学 | Miniature cereal suspension speed testing apparatus |
| CN204882604U (en) * | 2015-07-15 | 2015-12-16 | 河南农业大学 | Novel intelligence material speed of suspension test bench |
| CN205080153U (en) * | 2015-10-28 | 2016-03-09 | 陕西省农业机械研究所 | Test material speed of suspension's device |
| CN106690398A (en) * | 2016-12-20 | 2017-05-24 | 昆明船舶设备集团有限公司 | Tobacco paving, flattening and monolayer-conveying method and device |
| CN106769715A (en) * | 2016-12-27 | 2017-05-31 | 广西大学 | A kind of solid particles sediment speed determinator and application method |
| CN207763918U (en) * | 2018-01-10 | 2018-08-24 | 山西农业大学 | Agricultural material floating velocity test device |
-
2018
- 2018-01-10 CN CN201810024102.5A patent/CN108225719B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1075469A (en) * | 1963-08-02 | 1967-07-12 | Kloeckner Humboldt Deutz Ag | An air classifier |
| KR200169412Y1 (en) * | 1999-08-17 | 2000-02-15 | 삼공물산주식회사 | Device for measuring airflow rate |
| CN102928616A (en) * | 2012-10-19 | 2013-02-13 | 上海烟草集团有限责任公司 | Suspended velocity testing device of materials |
| CN104865402A (en) * | 2015-05-18 | 2015-08-26 | 南京农业大学 | Miniature cereal suspension speed testing apparatus |
| CN204882604U (en) * | 2015-07-15 | 2015-12-16 | 河南农业大学 | Novel intelligence material speed of suspension test bench |
| CN205080153U (en) * | 2015-10-28 | 2016-03-09 | 陕西省农业机械研究所 | Test material speed of suspension's device |
| CN106690398A (en) * | 2016-12-20 | 2017-05-24 | 昆明船舶设备集团有限公司 | Tobacco paving, flattening and monolayer-conveying method and device |
| CN106769715A (en) * | 2016-12-27 | 2017-05-31 | 广西大学 | A kind of solid particles sediment speed determinator and application method |
| CN207763918U (en) * | 2018-01-10 | 2018-08-24 | 山西农业大学 | Agricultural material floating velocity test device |
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| CN108225719A (en) | 2018-06-29 |
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