FI65672C - FOERFARANDE FOER TAGNING AV MJOELKPROV OCH VID FOERFARANDET ANAENDBAR ANORDNING - Google Patents

Description

65672

METHOD OF SAMPLING MILK AND EQUIPMENT USED IN THE METHOD

The invention relates to a method and apparatus for taking samples of a liquid to be transferred in a pipeline, e.g. milk, in connection with its reception, in order to enable the determination of e.g. quality and composition properties of the liquid 5.

Sampling of milk at the time of its receipt from the producer's stand or holding tank to the milk transport vehicle is an important part of milk collection. By law, milk 10 must be tested for fat and protein at least twice a month and for the total number of bacteria four times a year. On the basis of these determinations and the quantity of milk, the price received by the producer for his milk is determined.

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German Ahres & Boden equipment and MKT's equipment have already been known and used in Finland for milk sampling devices, PI patent no. 54974 · However, these devices have not been used much because of their shortcomings and disadvantages: they are expensive. , complex and require great care from the driver. In addition, when known devices are used, residues from previous samples remain in the equipment. This rinsing problem causes e.g. the fact that known equipment has not been approved in Finland for the sampling of bacterial analyzes of 25 milk samples.

DE-A-1 798 275 discloses a method in which the liquid flowing in the piping is directed either from the valve all past the sampling vessel or all into the sample vessel, the amount of sample-50 is controlled by the valve by throttling, the sampling vessel is after the valve. In the method according to the invention, it is possible, if desired, to direct all or all of the liquid flowing past the sample vessel or, if desired, a part of the liquid flowing in the piping of the sampling device to the sample vessel.

DE-A-1 188 836 discloses a method, 55 2 65672 in which liquefied gas is directed from the sampling piping either all to flow past the sample vessel or part of it to the sample vessel. However, the method presented in the publication is not suitable for taking milk samples where absolute purity is required.

5 DK Patent Publication No. 86749 discloses an apparatus for taking milk samples. It shows the lid structure through which the milk enters the sample container. The apparatus according to the invention is more advanced because it can be controlled by means of 10 control centers.

CH Patent No. 412,406 discloses a structure from which excess liquid is directed back from the intermediate tank through a lid structure; the sample container is filled, after which the liquid circulates through the lid structure 15 back into the tube.

The object of the invention is to obviate the above-mentioned drawbacks and to provide an easy-to-use sampling device which can be connected to known milk collection equipment and which allows sufficient rinsing to enable the sampling necessary for determining the quality and composition characteristics of the milk.

With the device according to the invention, the sample is obtained directly into the sample container 25 without intermediate containers commonly used in such devices, from which the milk sample is introduced into the sample containers by means of suction or vacuum.

The method according to the invention is characterized by the features set forth in the characterizing part of claim 1. The device according to the invention is characterized by the features set forth in the characterizing part of claim 5.

The invention will now be described in more detail with reference to an exemplary embodiment according to the accompanying drawings, which is intended to illustrate the invention without limiting the idea according to the invention:

Figure 1 is a partially sectioned view of the most commonly used milk receiving apparatus 5 to which a sampling apparatus according to the invention is connected;

Figure 2 shows schematically the sampling apparatus of Figure 1;

Figure 3 shows a cross-section of the lid structure of the sample container.

Figure 1 schematically shows the measuring equipment of a collection truck currently in use. The milk to be received is sucked from the containers by means of a self-priming pump 1 by means of a suction hose 3 with suction pipe 2 and 15 connectors. The apparatus is equipped with an air separator 20, a pipe strainer 5 and a volume meter 6. The milk enters the tank of the collection truck through the non-return valve 7.

According to the invention, the measuring apparatus of Fig. 1 is provided with a sampling apparatus 8, which in addition to a sample vessel, bottle or the like 9, container lid structure, bottle cap 10 and piping 11 ', 11 includes a flow rate sensor 12 (Fig. 2) for detecting milk flow. valves 14, 15 and 16 to control flushing and sample path.

Through the sample container lid structure 10 (or equivalent) to control the surface height of the sample in the sample container 9, a tube 17 passes as shown in Fig. 3 »which further shows an opening, a bore 18 through which the sample enters the sample container 9.

When applied to the most commonly used milk collection devices, the operation of the sampling device according to the invention can be divided into three stages: 4 65672

Step 1. Flushing of pipelines 2, 3 »1 and 4 up to the air separator 4 The sample container 9 is placed in its rack (not shown) and the volume control switch of the control center 5 is set to the correct position according to the amount of milk received, the suction time determining the opening and opening time of valves 14, 15 and 16 . The milk pump pu 1 is started and milk starts to flow along the pipelines 2, 3 and 4 to the air separator 20. The flow rate sensor 12 10 detects the milk input and the control center 13 registers the information. With the adjustment in the control center 13, the rinsing time is set long enough to ensure a good rinsing.

The rinsing time can be adjusted (not by the driver) as required. 15 Suitable rinsing times have been obtained experimentally. Samples for fat and protein assays use a base time that is extended by a separate switch in the control center 13 when sampling for bacterial assays. The rinsing time can be standardized, and comparatively 20 readable samples are obtained, since the rinsing time only begins when the milk begins to flow. When rinsing is complete, step 2 follows.

Step 2. Flushing the Sampling Device 25

When the flushing of the pipelines 2, 3, 1, 4 is completed, the valves 14 and 16 open, first the valve 14 and immediately afterwards the valve 16, whereby due to the pressure difference the milk starts to flow along the piping 11 *, whereby the piping 11 ', 30 11, valves 14 and 16 and the sample container lid structure 10 are flushed from the previous milk. The rinsing time of the sampling device can be adjusted by an adjustment in the control center (not the driver). The rinsing time is relatively short because the surfaces to be rinsed are small. During rinsing, the 35 sample containers can be lowered by 3-5 mm from the sample container lid structure 10 so that air enters the sample container 9 and the bore 18 is flushed with air.

Step 3 · 5 of the sample collection sampling device 8 are closed after flushing valves 14.and 16 and the valve 15 is opened, whereby the sample container and the inlet 9 consists of a pressure differential between the output side. Thereafter, the valve 14 begins to operate in pulses (the duration of the pulses 10 is controlled by a volume control switch in the control center 13) and milk begins to flow into the sample container 9 through a bore 18 in the sample container lid structure 10. The milk entering the sample container 9 is mixed in the sample container 9 because the entry of milk into the container 9 causes turbulence and the pressure is high. The level of the milk in the sample container is adjusted by a pipe 17 in front of the valve 15, through which the excess milk flows back to the pump 1.

When the flow rate sensor 12 detects the end of the flow and no new milk comes after a certain delay, the sample container 9 is lowered (3-5 mm) and the valves 14, 15 and 16 open. As the pump is still running, the piping will be emptied as air flows through the piping.

The device according to the invention is intended for quality determinations for quantities of milk larger than 15 l; the lower limit of the amount of milk used in the bacterial assays is about 20-30 1. In this case, a sufficiently good rinsing of the receiving equipment is ensured.

30 More than 400 replicate samples have been taken with the equipment and compared to manual sampling, which has shown that the equipment is suitable for taking compositional and quality determinations. The sample is taken by the truck driver, who is responsible for placing the sample container in the device and adjusting the 35 volume control switches according to the amount of milk received, after which the device operates automatically until the milk is collected.

Claims (2)

6 65672 the flow in the receiving pipeline stops and the delay time is exceeded, after which the sample is complete. The driver then removes the sample container from the equipment and closes the container and places the sample container in the transport box. In the field tests performed, the equipment has been found to be easy to use and reliable. The daily cleaning of the equipment after use takes place automatically when the car's reception equipment is washed in 10 normal washing cycles. Alternatively, the removal of the bottle during step 1 can also be replaced by a valve-drilling solution. Otherwise, the invention may be varied and modified within the scope of the claims according to the circumstances. In particular, the devices required to carry out the method can be modified within the scope of the claims. The invention integral inlet of the sample container and the pressure differential between the output side of the vessel 20 is controlled by a valve 15. CLAIMS 25 1. A method for taking a milk sample when transferring milk in a pipeline (21) to a tank, wherein a portion of the liquid flowing in the piping (21) is directed to the sampling apparatus (8) in the piping (11 ', 11) through, characterized in that the inlet side of the valve (14) fluid flow is directed to the sample container (9) of the cover structure (10) and an outlet-side valve (16) to the manifold (21), wherein the flow of liquid sample vessel (9) is guided through the cap structure (10) through a bore or similar (18) in the flow passage (19) with a constricted portion of the passage pipe 35 by means of a valve (16) on the outlet side and a valve (15) of the passage pipe (17) adjusting the surface of the sample container 7 65672. Method according to claim 1, characterized in that the flow of liquid in the piping (21) causes flushing of the piping (21), the duration of which can be adjusted by means of a control center (13) and in which information on the flow of liquid in the piping (12) 21) informing the control center (13), which controls the flushing of the piping (11 ', 11) belonging to the sampling equipment (8) and the flow channel (19) of the sample container lid structure, the duration of which can be adjusted, and that after flushing the control center (13) controls the amount of liquid provided for the sample container (9) · March 15 · sampling apparatus used in the method according to 1 or 2 (8), characterized in that it comprises a sampling manifold (11 ', 11') having an inlet side of the valve (14), the sample container cover structure (10), and 20 expenditure valve (16), and in that the cover structure (10) is provided with a narrowing portion of the flow channel (19) having a bore or the like (18) of the liquid virtaamiseks i sample vessel (9) crossing the cover structure of the flow channel, and that it is a sampling vessel (9) extending tube (17) or the 25 like, which passes through the cap structure (10) and a valve (15) connects the supply pipe (11) the expenditure side of the valve (16) after. Apparatus according to claim 3, characterized in that it comprises a control center (13) for setting valves (14, 15, 16) to control the flow of liquid either through the cover structure (10) or to control the valve (14 or 16) of the cover structure flow channel and open the pipe (17). ) a valve (15) for adjusting the surface height when guiding the sample into the sample container (9) · 8 65672. Apparatus according to claim 4, characterized in that its control means comprise a flow rate sensor (12) for detecting the flow of liquid in the piping (21). 5 1. For the purposes of the application of the provisions of Article 10, the provisions of this Regulation (21) are based on the provisions of this Regulation (14) and the provisions of this Regulation (9) 11 ', 11), kännetecknat därav, att vätskeflödet genom valve (14) p & inloppssidan styrs via 15 provkärlets (9) lockkonstruktion (10) ooh utloppssidans ven-til (16) tillbaka account rörnätet (21), varvid vätskeflödet account ) styrs genom strömningskanalens (19) borr-ning, som försetts med en avsmalnande del account de genom lockkonstruktenen (10) löpande röret eller genom motsvaran-20 de (18) med hjälp av en ventil (16) pä utloppssidan och med hjälp av ventilen (15) i röret (17), som löper genom lockkonstruktionen (10), vilken ventil (15) reglerar ytans höjd i provkärlet. 25 2. For the purposes of claim 1, the wording of which is set out in paragraph 1 (21) The relevant provisions of the patent law (21), which may be based on the provisions of the law (13) and on the basis of national law (21), which is based on an account of 30 years of accountability (12); ) i provkärlets lockkonstruktion, vilken sköljnings verkningstid kan juste-35 ras, samt att styrcentralen (13) efter sköljningen styr den bestämda vätskemängden account provkärlet (9) ·