RU43651U1 - DEVICE FOR DETERMINING THE CONTENT OF FAT IN MILK - Google Patents

Abstract

The utility model relates to devices for determining the fat content in milk and can be used in farms of the agro-industrial complex. The technical result of use is to increase the productivity of the device. In the device for determining fat in milk, the cuvette is made in the form of a cylinder, in the inner cavity of which a piston is installed. Using a piston, through a receiving tube, a milk sample is collected into a cuvette (the walls of which are reflectors for scattered light). A light emitting diode emits a directed radiation flux (wavelength 0.95-1.10 μm, power 5 mW), directing it through a cuvette to the surface of the receiver. The light flux scattered by the particles of fat, falling on the reflective surface of the chamber and, being summed with the direct transmitted light flux, is recorded by the receiver. A radiation receiver converts the light intensity into electrical signals, and an analog-to-digital converter converts them into digital form. The display unit gives the analysis result in numbers with an accuracy of 0.01% milk fat. The piston, when squeezing milk from the cuvette during each measurement, cleans the walls of the cuvette from the grease film. This eliminates the need for special cleaning of the cell during measurements.

Description

The utility model relates to devices for determining the fat content in milk and can be used in farms of the agro-industrial complex.

A device for determining the fat content in milk, containing a sequentially located light source, a capacitor with a diaphragm, a cuvette for placing a milk sample, sensors for direct and diffused rays, as well as a signal generation unit, a recording device and a power supply [1].

The disadvantage of this device is the need for dilution of a milk sample with distilled water in a ratio of 1:10. The need to dilute the milk sample reduces the measurement accuracy, since any inaccuracies in the proportional ratio of the components of the mixture lead to a change in the concentration of fat in the sample, i.e. to increase the measurement error.

The closest in technical essence and the achieved results to the proposed utility model is a device containing a light source sequentially located on the same optical axis, a capacitor with a diaphragm, a cell with a milk sample, a screen, as well as receivers of transmitted and scattered radiation, a signal generation unit, a recording device and power supply [2].

The advantage of this device is the ability to measure the fat content in a milk sample without preliminary dilution, which increases labor productivity when performing milk tests. The disadvantage of this device is the need for preliminary cleaning of the inner surface of the working cell from fat

films before each measurement, which is associated with high time spent on this operation when conducting mass analyzes.

The task to which the utility model is directed, and the technical result of its use, is to increase the productivity of the device.

The technical result is achieved by the fact that in the device for determining fat in milk containing a sequentially located light source, a cuvette for placing a milk sample, a sensor for direct and scattered rays, an analog-to-digital converter, a display unit and a power supply, the cuvette is made in the form of a cylinder, the internal cavity of which a piston is installed with the possibility of pumping a milk sample and cleaning the walls of the cell from the grease film.

Figure 1 shows a schematic diagram of the proposed device; figure 2 section of the cuvette in figure 1.

A device for determining fat in milk contains a light emitting diode 1 with a focusing lens from a semiconductor, a cylindrical cell 2 for placing a milk sample. A receiver — a photodiode 3 — is located on the other side of the radiation source. The output of the receiver is connected to the original analog-to-digital converter 4, which is connected to the display unit 5. A light-emitting diode, receiver, and analog-to-digital converter are connected to the power supply unit 6, which is located outside the device . The optical unit of the device is made by immersion technology and sealed.

The device operates as follows. Using a piston 7, through a receiving tube 8, a sample of milk is collected in a cuvette 2 (the walls of which are reflectors for scattered light). A light emitting diode emits a directed radiation flux (wavelength 0.95-1.10 μm, power 5 mW), directing it through a cuvette to the surface of the receiver. The light flux scattered by the fat particles, falling on the reflecting surface of the chamber and, being summed up with the direct light flux, is recorded

the receiver. A radiation receiver converts the light intensity into electrical signals, and an analog-to-digital converter converts them into digital form. The display unit gives the analysis result in numbers with an accuracy of 0.01% milk fat. Piston 7, when squeezing milk from the cell 2 at each measurement, cleans the walls of the cell from the grease film.

The proposed device has the following characteristics:

1. It has small overall dimensions (120 × 100 × 200 mm) and the weight of the device (1.7 kg).

2. It has high performance (100-150 samples per hour).

3. Electrically safe for maintenance personnel, operates from a 9 volt power source.

4. The device is quite simple to operate and does not require special qualifications of the operating personnel.

Sources of information:

1. USSR Copyright Certificate No. 606132, cl. G 01 N 33/06, 1976.

2. USSR copyright certificate No. 957103, cl. G 01 N 33/06, 1982.

Claims (1)

A device for determining the fat content in milk, containing a sequentially located light source, a cuvette for placing a milk sample, a sensor for direct and scattered rays, an analog-to-digital converter, an indicating unit and a power supply unit, characterized in that the cuvette is made in the form of a cylinder in the inner cavity which is equipped with a piston with the ability to pump milk samples and clean the walls of the cell from the grease film.