CN108152169A - A kind of grain kinematic viscosity self-operated measuring unit and measuring method - Google Patents

Abstract

The invention relates to an automatic grain kinematic viscosity measuring device and a measuring method. The technical solution is to include a first camera, a second camera, a controller, a positive pressure generator and a negative pressure generator, the lens of the first camera and the upper scale line Horizontally facing, the lens of the second camera is facing the lower scale line horizontally, the upper end of the wide pipe is provided with a first solenoid valve for sealing and conducting the upper mouth of the wide pipe, and the positive pressure generator is connected with the pressure by the second solenoid valve. The inlet and outlet pipes are connected, and the negative pressure generator is connected with the pressure inlet and outlet pipes through the third solenoid valve to form the positive and negative pressure supply structure of the capillary viscometer. The first camera, the second camera, the first solenoid valve, the second solenoid valve and the second The three solenoid valves are respectively connected with the controller. The present invention has high measurement accuracy, which effectively solves the problems caused by artificial naked eyes judging the time when the gelatinized liquid flows through the upper scale line and the lower scale line when measuring grain kinematic viscosity, and manual timing with an electronic stopwatch. error.

Description

A kind of grain kinematic viscosity automatic measuring device and measuring method

technical field

The invention relates to grain kinematic viscosity measurement, in particular to an automatic grain kinematic viscosity measurement device and a measurement method.

Background technique

GB/T 5516-2011 "Capillary Viscometer Method for Measuring Grain Kinematic Viscosity in Grain and Oil Inspection" stipulates that the grain to be tested is rice flour, wheat flour or corn flour. Inject the capillary viscometer into the upper opening of the wide tube of the capillary viscometer in a constant temperature water bath, so that the liquid level is slightly higher than the lower reservoir. After constant temperature for 12 minutes, use the ear wash ball and latex tube to slowly blow up and down the gelatinized liquid in the capillary viscometer for 2 to 3 times to make it even. At the 15th minute, suck the gelatinized liquid into and fill the upper reservoir of the capillary viscometer, remove the ear washing ball, let the gelatinized liquid flow down freely, and when the gelatinized liquid flows to the upper scale line of the capillary viscometer timing ball, press the timer Press the button to start timing. When the gelatinized liquid flows to the lower scale line of the timing ball, press the timing button again to stop timing, and record the time t ₁ when the gelatinized liquid flows through the timing ball of the capillary viscometer. Repeat the measurement twice, and take the average value as the time from the upper scale line to the lower scale line of the capillary viscometer timing ball when the pasting liquid flows through the capillary viscometer, which is the outflow time t. The product of the outflow time t and the viscosity constant C of the capillary viscometer is the kinematic viscosity v of the measured grain.

In actual measurement, the time measuring instrument is an electronic stopwatch. According to the naked eye observation, when the gelatinized liquid flows to the upper scale line of the capillary viscometer timing ball, press the electronic stopwatch to start timing, and when the gelatinized liquid flows to the lower scale line of the timing ball, press the electronic stopwatch to stop timing. The reading of the electronic stopwatch is the outflow time. The viscometer constant C is obtained from the measurement verification certificate and is a fixed value, so the main factor affecting the accuracy of the kinematic viscosity v is the measurement of the outflow time.

According to GB/T 5516-2011, the measurement of the outflow time needs to manually judge the moment when the gelatinized liquid flows through the upper and lower scale lines with the naked eye, and use an electronic stopwatch to time the time. The measurement accuracy and repeatability are not high due to the influence of the judgment of the time when the chemical liquid flows through the scale line. Therefore, in order to ensure the accuracy of grain kinematic viscosity, it is necessary to develop a new capillary viscometer automatic measurement method of grain kinematic viscosity.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide an automatic grain kinematic viscosity measurement device and measurement method, which can effectively solve the problems of accuracy and repeatability of grain kinematic viscosity measurement.

The technical scheme that the present invention solves is:

An automatic measuring device for kinematic viscosity of grain, comprising a capillary viscometer, the capillary viscometer is a U-shaped tube composed of vertically parallel wide tubes, narrow tubes and arc tubes connecting the lower ends of the wide tubes and narrow tubes Pipeline, the side wall of the upper end of the wide pipe is provided with a pressure inlet and outlet pipe connected with the inner cavity, the lower part of the wide pipe is provided with an outwardly protruding lower reservoir, and the narrow pipe is provided with an outwardly protruding upper reservoir. The outer wall of the narrow tube in the center of the reservoir is provided with an upper scale line, and the outer wall of the narrow tube below the upper storage tank is provided with a lower scale line. The grain kinematic viscosity automatic measuring device also includes a first camera, a second camera, a controller, a positive pressure generator and negative pressure generator, the lens of the first camera is facing the upper scale line horizontally, the lens of the second camera is facing the lower scale line horizontally, and the upper end of the wide tube is provided with an upper port for sealing and conducting the wide tube The first solenoid valve in the first part, the positive pressure generator is connected with the pressure inlet and outlet pipe through the second solenoid valve, and the negative pressure generator is connected with the pressure inlet and outlet pipe through the third solenoid valve, forming the positive and negative pressure supply structure of the capillary viscometer. The first camera, the second camera, the first solenoid valve, the second solenoid valve and the third solenoid valve are respectively connected with the controller.

The upper end of the wide pipe is equipped with an extension pipe sealedly connected with the upper mouth of the wide pipe, and the first electromagnetic valve is installed on the extension pipe.

A method for automatically measuring grain kinematic viscosity, comprising the following steps:

1), install the automatic measuring device:

Described automatic measuring device comprises capillary viscometer, and capillary viscometer is the U-shaped pipeline that is made of the wide tube that vertically parallels with each other, narrow tube and the arc tube that connects the lower end of wide tube, narrow tube together, wide tube, narrow tube The side wall of the upper end of the pipe is provided with a pressure inlet and outlet pipe connected with the inner cavity, the lower part of the wide pipe is provided with an outwardly protruding lower reservoir, the narrow pipe is provided with an outwardly protruding upper reservoir, and the center of the upper reservoir is The outer wall of the narrow tube is provided with an upper scale line, and the outer wall of the narrow tube below the upper reservoir is provided with a lower scale line. It is characterized in that the grain kinematic viscosity automatic measurement device also includes a first camera, a second camera, a controller, a positive pressure generator and negative pressure generator, the lens of the first camera is facing the upper scale line horizontally, the lens of the second camera is facing the lower scale line horizontally, and the upper end of the wide tube is provided with an upper port for sealing and conducting the wide tube The first solenoid valve in the first part, the positive pressure generator is connected with the pressure inlet and outlet pipe through the second solenoid valve, and the negative pressure generator is connected with the pressure inlet and outlet pipe through the third solenoid valve, forming the positive and negative pressure supply structure of the capillary viscometer. The first camera, the second camera, the first solenoid valve, the second solenoid valve and the third solenoid valve are respectively connected with the controller;

2), gelatinized liquid mixing:

According to GB/T 5516-2011, inject the prepared gelatinized liquid into the capillary viscometer which has been placed in the constant temperature water bath, so that the liquid level is slightly higher than the lower reservoir; the first solenoid valve is connected to the upper port of the wide pipe through the extension pipe , the first solenoid valve is closed; after 12 minutes of constant temperature, the controller controls the second solenoid valve to open, the third solenoid valve to close, and the positive pressure generator provides positive pressure to make the gelatinized liquid blow up to the upper scale line on the narrow tube, the first A camera automatically senses and sends a position signal of the gelatinized liquid to the controller. The controller automatically controls the second solenoid valve to close and the third solenoid valve to open. The negative pressure generator provides negative pressure to make the gelatinized liquid suck down to the bottom of the narrow tube When the scale line is reached, the second camera automatically senses and sends a position signal of the gelatinized liquid to the controller. The controller automatically controls the opening of the second solenoid valve and the closing of the third solenoid valve. Repeat the above operation 3 times to mix the gelatinized liquid;

3) Determination of outflow time:

After the gelatinized liquid is mixed, the third solenoid valve is closed, the second solenoid valve is opened, the first solenoid valve is closed, and the positive pressure generator provides positive pressure to make the gelatinized liquid blow up to the upper scale line on the narrow tube. The camera automatically senses and sends a position signal of the gelatinized liquid to the controller, and the controller automatically controls the second solenoid valve to close and the first solenoid valve to open, so that the inside of the capillary viscometer is in a normal pressure environment, the gelatinized liquid flows down freely, and the gelatinized liquid When the liquid level flows through the upper scale line, the first camera automatically senses and activates the controller to start timing. When the gelatinized liquid level flows through the lower scale line, the second camera automatically senses and activates the controller to end the timing. The timing time is the current time. Outflow time t ₁ , the outflow time is measured twice continuously, and the average value is the outflow time t;

4) Calculation of kinematic viscosity:

The outflow time t is multiplied by the viscosity constant C of the capillary viscometer, and the result is the kinematic viscosity v of the measured grain.

The automatic measuring device of the present invention is novel and unique in structure, simple and reasonable, easy to produce and easy to operate, and can be refitted on the basis of the existing capillary viscometer. Judging the moment when the gelatinized liquid flows through the upper and lower scale lines with naked eyes, and the error caused by manual timing with an electronic stopwatch, has practical application value, is easy to use, and has good results. It is an innovation in the grain kinematic viscosity measurement device. Significant economic and social benefits.

Description of drawings

Fig. 1 is a structural schematic diagram of the automatic measuring device of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Given by Figure 1:

An automatic measurement device for kinematic viscosity of grain, comprising a capillary viscometer, the capillary viscometer is composed of wide tubes 1a, narrow tubes 1b arranged vertically and parallel to each other, and an arc tube 1c connecting the lower ends of the wide tubes and narrow tubes together The U-shaped pipeline, the side wall of the upper end of the wide tube 1a is provided with a pressure inlet and outlet tube 4 communicating with its inner cavity, the lower part of the wide tube 1a is provided with an outwardly protruding lower reservoir 2, and the narrow tube 1b is provided with an outwardly protruding The raised upper reservoir 3, the outer wall of the narrow tube 1b at the center of the upper reservoir 3 is provided with an upper scale line 5, and the outer wall of the narrow tube 1b below the upper reservoir 3 is provided with a lower scale line 6, and the kinematic viscosity of the grain is automatically measured The device also includes a first camera 10, a second camera 11, a controller 13, a positive pressure generator 9a and a negative pressure generator 9b, the lens of the first camera 10 is horizontally facing the upper scale mark 5, and the lens of the second camera 11 Horizontally facing the lower scale line 6, the upper end of the wide pipe 1a is provided with a first solenoid valve 8a for sealing and conducting the upper mouth of the wide pipe, and the positive pressure generator 9a is connected to the pressure inlet and outlet pipe 4 through the second solenoid valve 8b , the negative pressure generator 9b is connected with the pressure inlet and outlet pipe 4 through the third electromagnetic valve 8c, forming the positive and negative pressure supply structure of the capillary viscometer, the first camera 10, the second camera 11, the first electromagnetic valve 8a, the second electromagnetic The valve 8b and the third solenoid valve 8c are connected to the controller 12, respectively.

In order to ensure the use effect, the upper end of the wide pipe 1a is equipped with an extension pipe 7 which is sealedly connected with the upper mouth of the wide pipe. The first solenoid valve 8a is installed on the extension pipe, and the extension pipe can be a latex pipe.

The controller 12 is equipped with a display 14 and an operation panel 13 connected thereto.

The upper reservoir 3 is a cavity composed of two ellipses connected in series, and the upper scale line 5 is located in the middle of the two ellipses.

The pressure inlet and outlet pipe 4 is equipped with a tee, the first interface of the tee is connected to the pressure inlet and outlet pipe, the second interface is connected to one end of the second electromagnetic valve 8b, and the other end of the second electromagnetic valve 8b is connected to the positive pressure generator. The pressure output end of the device 9a is connected, the third interface of the three-way is connected with one end of the third electromagnetic valve 8c, the other end of the third electromagnetic valve 8c is connected with the pressure output end of the negative pressure generator 9b, and the connecting pipeline can be latex tube.

Described controller is prior art (commercially available product), can judge liquid level position by the image signal that camera collects, and each electromagnetic valve is opened and closed according to position signal, as adopting the development board that model is STM32F429ZET6 Wait;

The positive pressure generator 9a and the negative pressure generator 9b are prior art, such as the ConST711 intelligent pressure generator produced by Beijing Const Instrument Technology Co., Ltd., which can generate a positive pressure of 8kPa and a negative pressure of -8kPa.

A method for automatically measuring grain kinematic viscosity, comprising the following steps:

1), install the automatic measuring device:

Described automatic measuring device comprises capillary viscometer, and capillary viscometer is the U-shaped tube that is made of wide tube 1a, narrow tube 1b that vertical parallel is arranged and the arc tube 1c that connects the lower end of wide tube, narrow tube together The side wall of the upper end of the wide tube 1a is provided with a pressure inlet and outlet tube 4 communicating with its inner cavity, the lower part of the wide tube 1a is provided with an outwardly protruding lower reservoir 2, and the narrow tube 1b is provided with an outwardly protruding upper reservoir. Reservoir 3, the outer wall of the narrow tube 1b at the center of the upper reservoir 3 is provided with an upper scale line 5, and the outer wall of the narrow tube 1b below the upper reservoir 3 is provided with a lower scale line 6, which is characterized in that the kinematic viscosity of the grain is automatically measured The device also includes a first camera 10, a second camera 11, a controller 13, a positive pressure generator 9a and a negative pressure generator 9b, the lens of the first camera 10 is horizontally facing the upper scale mark 5, and the lens of the second camera 11 Horizontally facing the lower scale line 6, the upper end of the wide pipe 1a is provided with a first solenoid valve 8a for sealing and conducting the upper mouth of the wide pipe, and the positive pressure generator 9a is connected to the pressure inlet and outlet pipe 4 through the second solenoid valve 8b , the negative pressure generator 9b is connected with the pressure inlet and outlet pipe 4 through the third electromagnetic valve 8c, forming the positive and negative pressure supply structure of the capillary viscometer, the first camera 10, the second camera 11, the first electromagnetic valve 8a, the second electromagnetic The valve 8b and the third electromagnetic valve 8c are respectively connected with the controller 12;

2), gelatinized liquid mixing:

According to GB/T 5516-2011, inject the prepared gelatinized liquid into the capillary viscometer placed in the constant temperature water bath, so that the liquid level is slightly higher than the lower reservoir 2, the constant temperature water bath is a transparent box, and the temperature and control accuracy are 50°C±0.1°C; the first solenoid valve 8a is connected to the upper port of the wide pipe through an extension tube, and the first solenoid valve 8a is closed; after 12 minutes of constant temperature, the controller controls the second solenoid valve 8b to open, the third solenoid valve 8c to close, and When the pressure generator 9a provides positive pressure to make the gelatinized liquid blow up to the upper scale line 5 on the narrow tube, the first camera 10 automatically senses and sends a position signal of the gelatinized liquid to the controller, and the controller automatically controls the second solenoid valve 8b Close, the third solenoid valve 8c is opened, and the negative pressure generator 9b provides negative pressure to make the gelatinized liquid suck down to the lower scale line 6 on the narrow tube, the second camera 11 automatically senses and sends the gelatinized liquid position signal to the controller , the controller automatically controls the opening of the second electromagnetic valve 8b, the closing of the third electromagnetic valve 8c, and repeats the above operation 3 times to mix the gelatinized liquid;

3) Determination of outflow time:

After the gelatinized liquid is mixed, the third electromagnetic valve 8c is closed, the second electromagnetic valve 8b is opened, the first electromagnetic valve 8a is closed, and the positive pressure generator 9a provides positive pressure to make the gelatinized liquid blow up to the upper scale line on the narrow tube After 5, the first camera 10 automatically senses and sends a gelatinized liquid position signal to the controller, and the controller automatically controls the closing of the second solenoid valve 8b and the opening of the first solenoid valve 8a, so that the inside of the capillary viscometer is in a normal pressure environment, and the paste The chemical liquid flows down freely, the first camera automatically senses and activates the controller to start timing when the liquid level of the gelatinized liquid flows through the upper scale line 5, and the lower camera automatically senses and activates the controller to stop timing when the liquid level of the gelatinized liquid flows through the lower scale line, The timing time is the outflow time t ₁ of this time, the outflow time is measured twice continuously, and the average value is the outflow time t;

4) Calculation of kinematic viscosity:

The outflow time t is multiplied by the viscosity constant C of the capillary viscometer, and the result is the kinematic viscosity v of the measured grain.

The present invention has achieved very satisfactory beneficial technical effects through practical application and calculation. Taking wheat, rice, and corn as tested samples, the kinematic viscosity is measured according to the GB/T 5516-2011 method and the method of the present invention respectively. For the same sample The measurement was repeated 7 times, and the standard deviation of the 7 measurement results was calculated using the Bessel formula, which can effectively characterize the dispersion of the measurement results. The standard deviation of the measurement results of this method is about 1/3 of the standard deviation of the measurement results of the GB/T 5516-2011 method, indicating that the dispersion of the measurement results of this method is small, and the reliability and consistency of the measurement results are higher. The relevant experimental data are as follows :

As can be seen from the foregoing, the present invention calculates by installing measuring equipment, mixing the gelatinized liquid, measuring outflow time, and kinematic viscosity. Through the switch of the pressure generator and the electromagnetic valve, positive pressure and negative pressure are generated in sequence, which can replace the ear washing ball to automatically realize the upward blowing and downward suction of the gelatinized liquid, and carry out automatic mixing of the gelatinized liquid. Through the upper and lower cameras Automatically sense the moment when the gelatinized liquid flows through the upper and lower scale lines of the capillary viscometer, and automatically measure the outflow time of the gelatinized liquid through the timing device. The standard deviation of the measurement results of this method is the standard deviation of the measurement results of GB/T 5516-2011 About 1/3 of that, the invention can not only replace the GB/T5516-2011 method, but also effectively reduce the dispersion of the results, so that the reliability and consistency of the measurement results are higher, it has practical application value, easy to use, and effective Well, it is an innovation in the grain kinematic viscosity measurement device and method, with remarkable economic and social benefits.

The applicant should point out that the above mentioned in the application is only an embodiment, and is not intended to limit the scope of protection of the application. Any technology that is essentially the same as the technical solution of the application is made by equivalent or equivalent replacement means The schemes all belong to the protection scope of the present application.

Claims (6)

1. a kind of grain kinematic viscosity self-operated measuring unit, including capillary viscometer, capillary viscometer is by vertical parallel Wide pipe (1a), narrow pipe (1b) and the U-shaped of arc tube (1c) composition that the lower end of wide pipe, narrow pipe links together of alternate setting Pipeline is provided with the pressure inlet/outlet pipe (4) being connected with its inner cavity, wide pipe (1a) lower part setting on the side wall of wide pipe (1a) upper end The lower reservoir (2) of outwardly convex is provided with the upper reservoir (3) of outwardly convex, the narrow pipe at upper reservoir (3) center in narrow pipe (1b) It is provided with high scale line (5) on (1b) outer wall, lower graduation mark (6) is provided on narrow pipe (1b) outer wall below upper reservoir (3), It is characterized in that, which further includes the first video camera (10), the second video camera (11), controller (13), positive pressure generator (9a) and negative pressure generator (9b), the camera lens and high scale line (5) of the first video camera (10) are horizontal just Right, the camera lens of the second video camera (11) and the horizontal face of lower graduation mark (6), the upper end of wide pipe (1a) is provided with to seal and lead Lead to the first solenoid valve (8a) of wide pipe upper oral part, positive pressure generator (9a) is through second solenoid valve (8b) and pressure inlet/outlet pipe (4) phase Even, negative pressure generator (9b) is connected through third solenoid valve (8c) with pressure inlet/outlet pipe (4), forms the positive and negative of capillary viscometer Press Supply Structure, the first video camera (10), the second video camera (11), the first solenoid valve (8a), second solenoid valve (8b) and third Solenoid valve (8c) is connected respectively with controller (12).

2. grain kinematic viscosity self-operated measuring unit according to claim 1, which is characterized in that described wide pipe (1a) upper end Equipped with the extension tube (7) being tightly connected with wide pipe upper oral part, the first solenoid valve (8a) is in extension tube.

3. grain kinematic viscosity self-operated measuring unit according to claim 1, which is characterized in that on the controller (12) Equipped with coupled display (14) and operation panel (13).

4. grain kinematic viscosity self-operated measuring unit according to claim 1, which is characterized in that the upper reservoir (3) is The cavity being made of 2 ellipses connected, high scale line (5) are intermediate positioned at two ellipses.

5. grain kinematic viscosity self-operated measuring unit according to claim 1, which is characterized in that the pressure inlet/outlet pipe (4) it is tightly connected on equipped with threeway, first interface and the pressure inlet/outlet pipe of threeway, second interface and second solenoid valve (8b) One end be connected, the other end of second solenoid valve (8b) is connected with the pressure output end of positive pressure generator (9a), the third of threeway A interface is connected with the one end of third solenoid valve (8c), the other end of third solenoid valve (8c) and the pressure of negative pressure generator (9b) Output terminal is connected.

6. a kind of grain kinematic viscosity method for automatic measurement, which is characterized in that include the following steps：

1), self-operated measuring unit is installed：

The self-operated measuring unit includes capillary viscometer, and capillary viscometer is the wide pipe set by vertical parallel spaced-apart The U-tube road that (1a), narrow pipe (1b) and the arc tube (1c) that the lower end of wide pipe, narrow pipe links together are formed, wide pipe (1a) The pressure inlet/outlet pipe (4) being connected with its inner cavity is provided on the side wall of upper end, wide pipe (1a) lower part is set under outwardly convex Reservoir (2) is provided with the upper reservoir (3) of outwardly convex in narrow pipe (1b), is set on narrow pipe (1b) outer wall at upper reservoir (3) center There is a high scale line (5), be provided with lower graduation mark (6) on narrow pipe (1b) outer wall below upper reservoir (3), which is characterized in that the grain Food kinematic viscosity self-operated measuring unit further includes the first video camera (10), the second video camera (11), controller (13), positive pressure and occurs Device (9a) and negative pressure generator (9b), camera lens and high scale line (5) horizontal face of the first video camera (10), the second video camera (11) camera lens and the horizontal face of lower graduation mark (6), the upper end of wide pipe (1a) is provided with to seal and be connected wide pipe upper oral part The first solenoid valve (8a), positive pressure generator (9a) is connected through second solenoid valve (8b) with pressure inlet/outlet pipe (4), negative pressure generator (9b) is connected through third solenoid valve (8c) with pressure inlet/outlet pipe (4), forms the positive and negative pressure Supply Structure of capillary viscometer, the One video camera (10), the second video camera (11), the first solenoid valve (8a), second solenoid valve (8b) and third solenoid valve (8c) are respectively It is connected with controller (12)；

2), dextrin mixing：

The dextrin prepared according to GB/T 5516-2011 is injected to the capillary viscometer having been placed in water bath with thermostatic control, makes it Liquid level is slightly higher than lower reservoir (2)；First solenoid valve (8a) by extension tube with width pipe it is suitable for reading be connected, the first solenoid valve (8a) pass It closes；After constant temperature 12min, controller control second solenoid valve (8b) is opened, and third solenoid valve (8c) is closed, positive pressure generator (9a) When providing positive pressure makes high scale line (5) being blown on dextrin in narrow pipe, the first video camera (10) automatic sensing simultaneously sends out gelatinization For liquid position signal to controller, controller automatically controls second solenoid valve (8b) closing, and third solenoid valve (8c) is opened, negative pressure hair When raw device (9b) offer negative pressure makes to be drawn to lower graduation mark (6) in narrow pipe under dextrin, the second video camera (11) automatic sensing is simultaneously Dextrin position signal is sent out to controller, controller automatically controls second solenoid valve (8b) unlatching, and third solenoid valve (8c) closes It closes, repeats above operation 3 times, make dextrin mixing；

3), the delivery time measures：

After dextrin mixing, third solenoid valve (8c) is closed, and second solenoid valve (8b) is opened, and the first solenoid valve (8a) is closed, just After pressure generator (9a) offer positive pressure makes the high scale line (5) being blown on dextrin in narrow pipe, the first video camera (10) is certainly dynamic Dextrin position signal should and be sent out to controller, controller automatically controls second solenoid valve (8b) closing, the first solenoid valve (8a) is opened, and so as to make in capillary viscometer under atmospheric pressure environment, dextrin free flow, dextrin liquid level flows through high scale The first video camera automatic sensing and controller is excited to start timing during line (5), dextrin liquid level flows through lower graduation mark and images at present Machine automatic sensing simultaneously excites controller to terminate timing, and timing time is this delivery time t₁, the delivery time continuously repeats It measures 2 times, average value is delivery time t；

4), kinematic viscosity calculates：

Delivery time t is multiplied with the viscosity constant C of capillary viscometer, and result is the kinematic viscosity v of tested grain.