A device for measuring the adsorption force of a particle on a suction hole and a method for measuring the adsorption force of a particle on a suction hole

Abstract

The present application relates to a kind of granular adsorption force measuring device of suction hole, negative pressure chamber end face and negative pressure chamber shell form negative pressure chamber, negative pressure supply system and air pressure measuring system are all connected with negative pressure chamber shell;Negative pressure chamber end face is equipped with mounting groove and mounting hole in front side;Test bin includes edge portion, bin body, mounting shaft, the front end opening of bin body, edge portion is located in the front end outside of bin body, the central part of bin body is formed mounting shaft by protruding back, suction hole is along the front and back direction and penetrates;The rear end of bin body is inserted into mounting groove, and mounting shaft is inserted into mounting hole;Pressure sensor is installed in the front side of negative pressure chamber end face, edge portion is acted on pressure sensor by lever mechanism, and pressure sensor is connected with pressure measuring system.It is also related to a kind of measuring method of granular adsorption force measuring device of suction hole.The present application can accurately, efficiently and conveniently realize the measurement of granular adsorption force of suction hole, and belongs to seed adsorption mechanism research auxiliary equipment.

Description

TECHNICAL FIELD

[0001] The application relates to a seed adsorption mechanism research auxiliary device, in particular to a device for measuring adsorption force of a particle close to a suction hole and a measuring method thereof. BACKGROUND

[0002] Direct seeding of rice is one of the important development directions of rice mechanized planting in China. At present, the mechanized planting of rice in China mainly adopts two modes, i.e. transplanting and direct seeding. The direct seeding mode can reduce the process and cost input and shorten the growth cycle.

[0003] In order to meet the requirements of precision and small quantity of hybrid rice seeding, compared with a mechanical seed metering device, an air type seed metering device uses airflow to fill, carry and drop seeds, has small damage to rice seeds, has high filling precision and can meet the requirements of precision and small quantity of seeding. With the emergence of super rice and some high-quality rice seeds, it is particularly important to realize stable single-seed seeding technology. At present, the single-seed technology of rice direct seeding is still in the stage of no seed adsorption mechanism that can be followed, the adsorption force cannot be accurately measured, the adsorption mechanism cannot be effectively summarized, and the best negative pressure of the negative pressure chamber cannot be found through actual test and exploration, so an apparatus for measuring the adsorption force of a particle close to a suction hole is urgently needed. SUMMARY

[0004] In view of the technical problems in the prior art, the purpose of the present application is to provide a device for measuring the adsorption force of a particle close to a suction hole and a measuring method thereof, which can accurately, efficiently and conveniently measure the adsorption force of a particle close to a suction hole.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A device for measuring the adsorption force of a particle close to a suction hole comprises a negative pressure supply system, an air pressure measuring system, a pressure measuring system, a negative pressure chamber shell, a negative pressure chamber end face, a test bin, a lever mechanism and a pressure sensor. The negative pressure chamber end face located in front and the negative pressure chamber shell located in back enclose a negative pressure chamber, and the negative pressure supply system and the air pressure measuring system are connected with the negative pressure chamber shell. The front side of the negative pressure chamber end face is provided with a mounting groove, and the mounting groove is provided with a penetrating mounting hole. The test bin comprises an edge portion, a bin body and a mounting shaft. The front end of the bin body is open, the edge portion is located outside the front end of the bin body, the center part of the bin body is protruded backward to form the mounting shaft, and the suction hole penetrates the bin body and the mounting shaft along the front-back direction. The rear end of the bin body is inserted into the mounting groove, and the bin body and the mounting groove are left with a gap in the front-back direction, and the mounting shaft is inserted into the mounting hole. The pressure sensor is installed on the front side of the negative pressure chamber end face, the edge portion acts on the pressure sensor through the lever mechanism, and the pressure sensor is connected with the pressure measuring system. The number of the lever mechanisms is multiple groups, which are uniformly distributed around the suction hole. The lever mechanism, the pressure sensor and the pressure measuring system are one-to-one correspondingly arranged.

[0007] As a preferred, the lever mechanism includes a lever set support and a lever set, the lever set support is arranged at the front side of the end face of the negative pressure chamber, the lever set is rotatably connected with the lever set support, the lever set is arranged along the radial direction of the end face of the negative pressure chamber, the inner side front end of the lever set is in contact with the rear side of the edge portion of the test chamber, the outer side front end of the lever set is in contact with the rear side of the pressure sensor; the pressure sensor is installed in front of the end face of the negative pressure chamber through a sensor support.

[0008] As a preferred, the lever set includes a lever arm I, a lever arm II, a connecting rod and two force transmission parts; the lever arm I and the lever arm II are arranged in parallel with each other, the lever arm I and the lever arm II are connected through the connecting rod, the two force transmission parts are arranged between the lever arm I and the lever arm II, through holes are arranged on the lever arm I and the lever arm II as lever fulcrums to connect with the lever set support; the distance between the lever fulcrum and the test chamber is greater than the distance between the lever fulcrum and the pressure sensor.

[0009] As a preferred, the force transmission part includes a sleeve part at the rear end and a conical part at the front end, the sleeve part is sleeved on the connecting rod, the cross section of the conical part is square, and the cross section gradually decreases from the rear to the front.

[0010] As a preferred, the end face of the negative pressure chamber is disc-shaped, the installation groove is a circular groove, and the installation hole is a circular through hole; in the test chamber, the edge portion is annular, the chamber body is a cylindrical with an open front end, and the installation shaft is cylindrical.

[0011] As a preferred, the negative pressure supply system includes a negative pressure fan and a fan controller; the negative pressure fan is arranged at the rear end of the negative pressure chamber shell, and the fan controller is connected with the negative pressure fan.

[0012] As a preferred, the air pressure measuring system includes an air pressure gauge, a transparent air pipe, a Pitot tube, an adjusting nut and a sealing nut; the air pressure gauge is connected with the Pitot tube through the transparent air pipe, the Pitot tube penetrates into the negative pressure chamber shell, the adjusting nut and the sealing nut are installed on the Pitot tube, the air inlet of the Pitot tube is adjusted to be in the central position of the negative pressure chamber through the adjusting nut, and the Pitot tube and the negative pressure chamber shell are fixed through the sealing nut.

[0013] As a preferred, the pressure measuring system includes a signal line and a voltage digital display; the voltage digital display is connected with the pressure sensor through the signal line.

[0014] As a preferred, the test chamber is equipped with multiple suction holes of different shapes, the test chamber is replaced, and the adsorption force of the suction holes of different shapes on the same kind of particles can be measured; the particles of different shapes can be replaced with each other, the particles are replaced, and the adsorption force of the particles of different shapes under the same shape of the suction hole can be measured.

[0015] A kind of measuring method of the adsorption force measuring device of particle close suction hole, when the device is in working condition, the barometer of gas pressure measuring system shows initial negative pressure value, the fan controller of negative pressure supply system controls the stable initial negative pressure value P provided by negative pressure fan in negative pressure chamber, the indication of the voltage indicator of each pressure measuring system at this time is recorded, the sum of the three indications is taken as initial pressure value F1;The measured particle is placed in test bin, and the measured particle is adsorbed to the suction hole of test bin, the fan controller of negative pressure supply system controls the stable initial negative pressure value P provided by negative pressure fan in negative pressure chamber, the indication of the voltage indicator of each pressure measuring system at this time is recorded, the sum of the three indications is taken as retest pressure value F2, the difference between retest pressure value and initial pressure value is taken as measurement difference F3, according to the principle of lever, the measurement value F4 of adsorption force is calculated from measurement difference, meet:

[0016]

[0017] Wherein, L1 is the long force arm length of lever group, L2 is the short force arm length of lever group;

[0018] The measurement value F4 of adsorption force corresponding to each initial negative pressure value P is recorded, and the relationship between the initial negative pressure value P and the measurement value F4 of adsorption force is obtained.

[0019] The present application has the following advantages:

[0020] 1. The structure of test bin front and negative pressure chamber rear is used, and the particle is directly placed in the test bin, without the need for the fixing structure of the particle, which is closer to the actual working scene, and the particle is easy to take and replace.

[0021] 2. When measuring, the difference between two measurements is used to control the variable, and the only difference between the two measurements is whether the particle is adsorbed or not, which excludes the interference of factors other than the particle, so that the measurement result is more accurate.

[0022] 3. The force received by the test bin is transmitted through multiple points, preferably three points, which are transmitted to three lever groups respectively, so that the measurement process is more stable, and the measurement result is more accurate.

[0023] 4. Test bins of different suction hole shapes can be replaced with each other, which can measure the adsorption force of different shapes of suction holes on the same kind of particle, and different shapes of particles can also be replaced with each other, which can measure the adsorption force of different shapes of particles in the same shape of suction hole, has good versatility and large adjustment freedom. It has important significance for exploring the adsorption mechanism of air suction type seed metering device.

[0024] 5. The lever principle is used to amplify the originally small and unmeasurable adsorption force to be recognized by the pressure sensor, so that the measurement process is more simple and the result is more accurate.

[0025] 6. The measurement results of the negative pressure measurement system and the pressure measurement system can be directly displayed, which is convenient for sampling process adjustment and result recording. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The shaft schematic diagram of the structure of the present application.

[0027] Figure 2 The structural schematic diagram of the air pressure measurement system.

[0028] Figure 3 The partial enlarged view of the lever mechanism.

[0029] Figure 4 The structural schematic diagram of the lever group.

[0030] Figure 5 The structural schematic diagram of the force transmission part.

[0031] Figure 6 The structural schematic diagram of the pressure measurement system.

[0032] Figure 7 The sectional view of the test chamber and the end face of the negative pressure chamber.

[0033] Figure 8 The structural schematic diagram of the end face of the negative pressure chamber.

[0034] Figure 9a And Figure 9b The structural schematic diagram of the test chamber.

[0035] Figure 10 The structural schematic diagram of the device main body.

[0036] Figure 11 The structural schematic diagram of the lever arm I.

[0037] Figure 12 The structural schematic diagram of the lever arm II.

[0038] Reference numerals in the drawing: 1 measured particle, 2 voltage indicator, 3 signal line, 4 air pressure gauge, 5 transparent air pipe, 6 negative pressure fan, 7 fan controller, 8 negative pressure chamber shell, 9 pitot tube, 10 end face of the negative pressure chamber, 11 test chamber, 12 lever group, 13 pressure sensor, 14 adjusting nut, 15 sealing nut, 121 force transmission part, 122 lever arm I, 123 lever arm II, 124 lever fulcrum, 101 lever group support, 102 sensor support, 111 suction hole, lever group long force arm length, lever group short force arm length. DETAILED DESCRIPTION

[0039] The application will be described in further detail below with reference to the specific embodiments.

[0040] A particle close to suction hole adsorption force measuring device, comprising a negative pressure supply system, a gas pressure measuring system, a pressure measuring system, a negative pressure chamber shell, a negative pressure chamber end face, a test bin, a lever mechanism, a pressure sensor; the negative pressure chamber end face in front and the negative pressure chamber shell in back form a negative pressure chamber, the negative pressure supply system and the gas pressure measuring system are connected with the negative pressure chamber shell; the front side of the negative pressure chamber end face is provided with a mounting groove, and a penetrating mounting hole is arranged in the mounting groove; the test bin comprises an edge portion, a bin body and a mounting shaft, the bin body is open at the front end, the edge portion is located outside the front end of the bin body, the center part of the bin body is protruded backward to form the mounting shaft, and the suction hole penetrates the bin body and the mounting shaft along the front-back direction; the rear end of the bin body is inserted into the mounting groove, and a gap is left between the bin body and the mounting groove in the front-back direction, and the mounting shaft is inserted into the mounting hole; the pressure sensor is installed on the front side of the negative pressure chamber end face, the edge portion acts on the pressure sensor through the lever mechanism, and the pressure sensor is connected with the pressure measuring system; the number of the lever mechanism is multiple groups, which are evenly distributed around the suction hole, and the lever mechanism, the pressure sensor and the pressure measuring system are one-to-one corresponding arrangement. Wherein, the rear end of the negative pressure chamber end face is sealingly connected with the front end of the negative pressure chamber shell, and the rear end of the negative pressure chamber shell is sealingly connected with the negative pressure fan.

[0041] The lever mechanism comprises a lever group support and a lever group, the lever group support is arranged on the front side of the negative pressure chamber end face, the lever group is rotatably connected with the lever group support, the lever group is arranged along the radial direction of the negative pressure chamber end face, the inner front end of the lever group is in contact with the rear side of the edge portion of the test bin, and the outer front end of the lever group is in contact with the rear side of the pressure sensor; the pressure sensor is installed on the front side of the negative pressure chamber end face through a sensor support. The lever group in the embodiment is three groups.

[0042] The lever group comprises a lever arm I, a lever arm II, a connecting rod and two force transmission parts, the lever arm I and the lever arm II are arranged in parallel with each other, the lever arm I and the lever arm II are connected through the connecting rod, the two force transmission parts are arranged between the lever arm I and the lever arm II, and through holes are arranged on the lever arm I and the lever arm II as lever fulcrums and connected with the lever group support; the distance between the lever fulcrum and the test bin is greater than the distance between the lever fulcrum and the pressure sensor, so that the force can be amplified through the lever principle and measured by the pressure sensor, and the stress relationship between the two force transmission parts can be obtained according to the lever principle.

[0043] The force transmission part comprises a sleeve part at the rear end and a conical part at the front end, the sleeve part is sleeved on the connecting rod, and the cross section of the conical part is square and gradually decreases from back to front.

[0044] The negative pressure chamber end face is disc-shaped, the mounting groove is a circular groove, and the mounting hole is a circular through hole; in the test bin, the edge portion is annular, the bin body is a cylindrical shape with an open front end, and the mounting shaft is cylindrical.

[0045] The negative pressure supply system comprises a negative pressure fan and a fan controller; the negative pressure fan is arranged at the rear end of the negative pressure chamber shell, and the fan controller is connected with the negative pressure fan. The power output of the negative pressure fan is controlled by the fan controller.

[0046] The air pressure measuring system comprises an air pressure gauge, a transparent breather pipe, a Pitot tube, an adjusting nut and a sealing nut. The air pressure gauge is connected with the Pitot tube through the transparent breather pipe, the Pitot tube penetrates into the negative pressure chamber shell, the adjusting nut and the sealing nut are arranged on the Pitot tube, the air inlet of the Pitot tube is adjusted to be in the central position of the negative pressure chamber through the adjusting nut, and the Pitot tube and the negative pressure chamber shell are fixed through the sealing nut, and the sealing nut plays a sealing role.

[0047] The pressure measuring system comprises a signal line and a voltage indicating meter. The voltage indicating meter is connected with the pressure sensor through the signal line, and the voltage indicating meter can display the pressure value measured by the pressure sensor.

[0048] The test bin is equipped with a plurality of suction holes of different shapes, and the test bin can be replaced to measure the adsorption force of the suction holes of different shapes on the same kind of particles; the particles of different shapes can be replaced, and the adsorption force of the particles of different shapes on the same kind of suction holes can be measured.

[0049] The test bins of different shapes can be replaced, the test bin is sealingly connected with the end face of the negative pressure chamber, a gap is left between the two in the front-rear direction, the test bin can be slightly moved in the axial direction relative to the end face of the negative pressure chamber; when the measured particles are adsorbed by the suction holes, the adsorption force is transmitted to the test bin, the test bin has a tendency to move backward to drive the three force transmission parts uniformly distributed on the disc surface to move backward, the force transmission parts on the other side of the lever group push the pressure sensor forward, and the size of the force can be read by the voltage indicating meter.

[0050] A measuring method of a particle adsorption force measuring device close to a suction hole, and the specific steps are as follows:

[0051] (1) When the device is in a working state, the air pressure gauge of the air pressure measuring system displays an initial negative pressure value, the fan controller of the negative pressure supply system controls the negative pressure fan to provide a stable initial negative pressure value P in the negative pressure chamber, and the readings of the voltage indicating meters of the pressure measuring systems at this time are recorded, and the sum of the readings is taken as an initial pressure value F1.

[0052] (2) The measured particles are placed in the test bin, the measured particles are adsorbed on the suction holes of the test bin, the fan controller of the negative pressure supply system controls the negative pressure fan to provide a stable initial negative pressure value P in the negative pressure chamber, the readings of the voltage indicating meters of the pressure measuring systems at this time are recorded, and the sum of the readings is taken as a retest pressure value F2.

[0053] (3) Take the difference between the retest pressure value and the initial pressure value as the measurement difference F3,

[0054] (4) According to the lever principle, the measurement value F4 of the adsorption force is calculated from the measurement difference, and satisfies:

[0055]

[0056] Wherein, L1 is the long force arm length of the lever group, and L2 is the short force arm length of the lever group;

[0057] (5) Record the measurement value F4 of the adsorption force corresponding to each initial negative pressure value P, and then obtain the relationship between the initial negative pressure value P and the measurement value F4 of the adsorption force.

[0058] The application can realize the measurement of the adsorption force of the particles at the small hole, and can quantitatively explore the relationship between the negative pressure value of the negative pressure chamber and the adsorption force of the particles through the test. The application has important significance for exploring the adsorption mechanism of the air suction type seed metering device.

[0059] The above embodiment is the preferred embodiment of the application, but the embodiment of the application is not limited by the above embodiment, and any change, modification, substitution, combination, simplification made without departing from the spirit and principle of the application shall be an equivalent replacement mode, which is included in the protection scope of the application.

Claims

1. A device for measuring the adhesion of a granular material to a suction hole, characterized by: The utility model relates to a kind of negative pressure test device, including negative pressure supply system, air pressure measurement system, pressure measurement system, negative pressure chamber shell, negative pressure chamber end face, test bin, lever mechanism and pressure sensor;Negative pressure chamber end face located in front and negative pressure chamber shell located in rear enclose negative pressure chamber, and negative pressure supply system and air pressure measurement system are connected with negative pressure chamber shell;The front side of negative pressure chamber end face is equipped with mounting groove, and mounting hole is equipped in mounting groove;Test bin includes edge portion, bin body and mounting shaft, and the front end of bin body is open, and edge portion is located in the front end outside of bin body, and the central part of bin body is protruded to form mounting shaft backward, and suction hole is along front-back direction and penetrates bin body and mounting shaft;The rear end of bin body is inserted into mounting groove, and bin body and mounting groove are left gap in front-back direction, and mounting shaft is inserted into mounting hole;Pressure sensor is installed in the front side of negative pressure chamber end face, and edge portion is acted on pressure sensor by lever mechanism, and pressure sensor is connected with pressure measurement system;The number of lever mechanism is multiple, and is evenly distributed with suction hole as center circle, and lever mechanism, pressure sensor, pressure measurement system are one-to-one corresponding arrangement; Lever mechanism includes lever group support and lever group, and lever group support is arranged in the front side of negative pressure chamber end face, and lever group is rotatably connected with lever group support, and lever group is arranged along the radial of negative pressure chamber end face, and the inside front end of lever group is contacted with the rear side of the edge portion of test bin, and the outside front end of lever group is contacted with the rear side of pressure sensor;Pressure sensor is installed in the front of negative pressure chamber end face by sensor support; Measured particle is placed in test bin, so that measured particle is adsorbed in suction hole of test bin.

2. A device for measuring the suction force of a granule against a suction hole according to claim 1, characterized in that: Lever group includes lever arm I, lever arm II, connecting rod and two force transmission parts;Lever arm I and lever arm II are arranged in parallel with each other, and lever arm I and lever arm II are connected by connecting rod, and two force transmission parts are arranged between lever arm I and lever arm II, and through hole is arranged on lever arm I and lever arm II as lever fulcrum and lever group support is connected;The distance between lever fulcrum and test bin is greater than the distance between lever fulcrum and pressure sensor.

3. A device for measuring the suction force of a granule against a suction orifice according to claim 2, characterized in that: The force transmission part includes a sleeve part at the rear end and a conical part at the front end, the sleeve part is sleeved on the connecting rod, the cross section of the conical part is square, and the cross section gradually decreases from back to front.

4. A device for measuring the suction force of a granule against a suction hole according to claim 1, characterized in that: The negative pressure chamber end face is disc-shaped, the mounting groove is circular groove, and the mounting hole is circular through hole;In test bin, the edge portion is annular, the bin body is cylindrical with open front end, and the mounting shaft is cylindrical.

5. The apparatus for measuring the suction force of a particle to a suction hole according to claim 1, wherein: The negative pressure supply system includes a negative pressure fan and a fan controller;The negative pressure fan is arranged at the rear end of the negative pressure chamber shell, and the fan controller is connected with the negative pressure fan.

6. A device for measuring the adhesion of a granular material to a hole according to claim 1, wherein: The air pressure measurement system includes an air pressure gauge, a transparent air pipe, a Pitot tube, an adjusting nut and a sealing nut, the air pressure gauge is connected with the Pitot tube through the transparent air pipe, the Pitot tube penetrates into the negative pressure chamber shell, the adjusting nut and the sealing nut are installed on the Pitot tube, the air inlet of the Pitot tube is adjusted to be in the central position of the negative pressure chamber by the adjusting nut, and the Pitot tube and the negative pressure chamber shell are fixed by the sealing nut.

7. A device for measuring the adhesion of a granular material to a hole according to claim 1, wherein: The pressure measurement system includes a signal line and a voltage digital display, and the voltage digital display is connected with the pressure sensor through the signal line.

8. A device for measuring the adhesion of a granule to a hole according to claim 1, characterized in that: The test bin is equipped with a plurality of suction holes of different shapes, the test bin is replaced, and the adsorption force of the suction holes of different shapes on the same kind of particles can be measured; the particles of different shapes can be replaced with each other, the particles are replaced, and the adsorption force of the particles of different shapes under the same kind of suction hole can be measured.

9. A method of measuring the suction force of a particle close to a suction hole according to any one of claims 1 to 8, characterized in that: When the device is in working condition, the barometer of the air pressure measuring system displays an initial negative pressure value, the fan controller of the negative pressure supply system controls the negative pressure fan to provide a stable initial negative pressure value P in the negative pressure chamber, the voltage indicator of the voltage indicator table of each pressure measuring system at this time is recorded, and the sum of the three indicators is taken as the initial pressure value F1; the measured particles are put into the test bin, the measured particles are adsorbed on the suction holes of the test bin, the fan controller of the negative pressure supply system controls the negative pressure fan to provide a stable initial negative pressure value P in the negative pressure chamber, the voltage indicator of the voltage indicator table of each pressure measuring system at this time is recorded, and the sum of the three indicators is taken as the retest pressure value F2; the difference between the retest pressure value and the initial pressure value is taken as the measurement difference F3, the measurement value F4 of the adsorption force is calculated according to the lever principle, and the following formula is satisfied: ， L1 is the length of the long lever arm of the lever set, L2 is the length of the short lever arm of the lever set; The measurement value F4 of the adsorption force corresponding to each initial negative pressure value P is recorded, and the relationship between the initial negative pressure value P and the measurement value F4 of the adsorption force is obtained.

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