JPH11346586A - Recovering structure of remaining water or remaining milk in milk claw and milk tube, and recovering of remaining water and remaining milk in milk claw and milk tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recovering structure of remaining water or remaining milk, capable of readily and precisely removing the remaining water or the remaining milk remaining in a milk claw and a milk tube to a vacuum pressure line. SOLUTION: This recovering structure has an opening and closing means 100 for opening and closing a communicating opening 38 for communicating the interior of a milk claw 34 and the interior of a milk tube 36 by a valve 50. The communicating opening 38 is closed by operating the valve 50 by the opening and closing means 100, and the gas in the interior of the milk tube 36 is sucked into a vacuum pressure line to form the interior of the milk tube into a high vacuum state. Thereafter, the communicating opening 38 is opened by operating the valve 50 by the opening and closing means 100 to allow outside air to rush in the interior of the milk tube 36 through the interior of the milk claw 34 and the communicating opening 38. The remaining milk and the remaining water in the milk claw 34 and the milk tube 36 is sent out into the interior of the vacuum pressure line and discharged to the interior of a receiver or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a milking unit for milking, in which milk remaining in milk claw and milk tube used for washing or milk after milking is sent out to a vacuum pressure line. The present invention relates to a mechanism for recovering residual water or milk in milk claw and milk tube and a method for recovering residual water or milk in milk claw and milk tube.

[0002]

2. Description of the Related Art In general, a milker (milking apparatus) extracts milk from udders such as dairy cows by using vacuum pressure and passes the milk through a milk line into a receiver (a tank for temporarily storing milk). It is being transported.

In this milker, it is necessary to frequently wash a milker unit for extracting milk from the breast and a milk line for conveying milk. The reason for this is that milk provided for beverages is subjected to strict inspections at the collection site or the like, and is rejected if the milk contains various bacteria.

For this reason, the above-mentioned milk car is provided with a washing mechanism for washing the inside of the milk car unit and the milk line. As shown in FIG. 6, this cleaning mechanism uses a milk line 10 connected to a vacuum pressure source (not shown) such as a vacuum pump as a vacuum pressure line 12. Then, the inside of the vacuum pressure line 12 is
It is kept at a high vacuum pressure of kPa.

The cleaning mechanism includes a cleaning tank 20.
Then, the teat cup 32 of the milker unit 30 is put into the cleaning liquid stored in the cleaning tank 20. Then, using the vacuum pressure in the vacuum pressure line 12, the cleaning liquid in the cleaning tank 20 is passed through the milking port 32a of the teat cup.
Milk claw 34 connected to teat cup 32
It is sucked into and into the milk tube 36 and into the vacuum line 12 and passes through them. And
The washing liquid causes the inside of the teat cup 32, the inside of the milk claw 34, the inside of the milk tube 36, and the milk line 10
The inside of the vacuum pressure line 12 corresponding to the above is washed. Alternatively, the teat cup 32 is mounted on a teat cup washer (not shown). And a cleaning liquid supply pipe (not shown) connected to the teat cup washer
Is poured into the cleaning liquid in the cleaning tank 20 described above. Then, the cleaning liquid in the cleaning tank 20 is supplied to the cleaning liquid supply pipe, the teat cup washer, the teat cup 32, and the milk through the suction port at the rear end of the cleaning liquid supply pipe by using the vacuum pressure in the vacuum pressure line 12. Claw 34
, Into the milk tube 36 and into the vacuum pressure line 12 and pass through them. Then, the inside of the teat cup 32, the inside of the milk claw 34, the inside of the milk tube 36 and the inside of the vacuum pressure line 12 corresponding to the milk line 10 are washed with the washing liquid.

[0006] By the way, using the above-mentioned washing mechanism, as described above, the inside of the teat cup 32 and the milk claw 3 are removed.
After cleaning the inside of the milk tube 4, the milk tube 36, and the milk line 10 with the cleaning liquid, a part of the cleaning liquid remains in the milk claw 34 and the milk tube 36 as a plurality of lumps as shown in FIG. Was. Then, the remaining water 40 of the cleaning liquid is transferred into the milk claw 34 and the milk tube 3.
6 and not removed, the remaining water 4
The bacteria contained in 0 grew in the residual water 40. And
When milking is performed using a milker in which the residual water 40 remains, bacteria in the residual water 40 may be mixed in milk, or impurities such as detergents in the residual water 40 may be mixed in milk. There was a possibility that the quality of milk would be reduced.

Here, as described above, the milk claw 34
The reason why the residual water 40 of the cleaning liquid remains in the inside and the milk tube 36 is as described above using the above-described cleaning mechanism.
This is because, after the cleaning, the cleaning liquid in the cleaning tank 20 is completely sucked into the teat cup 32 or sucked into the cleaning liquid supply pipe, and becomes empty. Then, the milking port 32a of the teat cup and the water suction port at the rear end of the cleaning liquid supply pipe are exposed to the outside air. And milking mouth 3 of the teat cup
2a and the outside air from the water suction port at the rear end of the cleaning liquid supply pipe,
Through milk claw 34 and milk tube 36
This is because a large amount of suction can be continued into the vacuum pressure line 12. Then, the vacuum pressure in the vacuum pressure line 12 is greatly reduced. As a result, the inside of the milk claw 34 or the milk tube 3 is
This is because it becomes difficult to completely suck the residual water 40 remaining in the vacuum pressure line 12 into the vacuum pressure line 12 against the gravity or the like applied to the residual water 40.

Therefore, in the conventional washing operation, after the inside of the teat cup 32, the inside of the milk claw 34, the inside of the milk tube 36, and the inside of the milk line 10 are washed with the washing liquid as described above, the milk tube 36 is removed. 10 had been removed. Next, the milk claw 34 connected to the milk tube 36 was lifted high by hand. The milk claw 34 and the milk tube 36 connected to the milk claw 34 have a slanting downward slope. Then, the remaining water 40 in the milk claw 34 and the milk tube 36 is removed to the outside of the milk tube 36 from the connection port of the milk tube 36 to the milk line 10 by utilizing the gravity applied to the remaining water. Was.
Alternatively, the milk tube 36 removed from the milk line 10 is lifted up by hand. In addition, the milk tube 36 and the milk claw 34 connected to the milk tube 36 have a slope obliquely downward. The remaining water 40 in the milk tube 36 and the milk claw 34
Using the gravity added to the residual water,
The teat cup 32 was removed from the milking opening 32a of the teat cup connected to the inside.

After milking is performed using the above-mentioned milker, all of the milk is removed from the milk line 10.
Without being transported into the receiver (not shown)
A part of the milk remained in the milk claw 34 of the milker unit 30 and the milk tube 36 connected thereto in the form of a plurality of lumps, similarly to the above-mentioned washing water.

Therefore, after milking using the above-mentioned milker, the milk tube 3
6 had been removed from milk line 10. Then, the residual milk remaining in the milk claw 34 and the milk tube 36 is removed by utilizing the gravity applied to the residual milk.
It was excluded from the inside and the inside of the milk tube 36 to the outside. And the milk claw 34 and the milk tube 36
This prevented bacteria from propagating to the remaining milk inside.

[0011]

However, the milk claw 34 and the milk tube 36 to which the teat cup 32 is connected have a considerable weight, and the work of supporting them by hand requires a great deal of labor. Washing work and milking work using a milker were difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and it is possible to remove the milk tube from the milk line and raise the milk tube or the milk claw connected thereto without raising the milk tube or the milk claw connected thereto. Collection mechanism (recovery mechanism) for remaining water or milk in milk claw and milk tube that can easily and reliably send remaining water or milk remaining in the milk line corresponding to the vacuum pressure line and remove it in the receiver and the like And a method for collecting residual water or milk in the milk claw and the milk tube (recovery method).

[0013]

In order to achieve the above object, a recovery mechanism according to the present invention is arranged such that a milk claw communicating with a teat cup and a vacuum pressure line communicate with each other via a milk tube, In a milk car provided with a valve for opening and closing a communication port between the inside of the milk claw and the inside of the milk tube, an opening / closing means for opening and closing the communication port by the valve, the remaining water or the remaining water in the milk claw and the milk tube. An opening / closing means for collecting milk is provided.

In the recovery mechanism of the present invention, a sub-milk claw is provided adjacent to the milk claw with a diaphragm as a partition wall, and the inside of the sub-milk claw is communicated with a low vacuum pressure line. A milker equipped with the valve that opens and closes a communication port between the inside of the milk claw and the inside of the milk tube is used, and the opening and closing means communicates the inside of the sub milk claw with the inside of the low vacuum pressure line, Lower the air pressure in the sub milk claw, move the diaphragm to the sub milk claw side, open the communication port closed by the valve attached to the diaphragm, or send outside air into the sub milk claw The air pressure in the sub milk claw is increased, and the diaphragm is moved to the milk claw side to be mounted on the diaphragm. Is to be preferred that it has a structure comprising a switching valve or closing said communication port by the valve.

A method of using the recovery mechanism of the present invention, wherein the recovery method of the present invention includes the following steps. a. Operate the valve by the opening and closing means to close the communication port between the milk craw and the milk tube of the milk car in a state where the outside air can be sucked from the milking port of the teat cup, and the communication state between the milk claw and the milk tube And continuously sucking the gas in the milk tube into the vacuum pressure line to bring the milk tube into a high vacuum state. b. After the step a, the valve is operated by the opening / closing means,
The communication tube is opened, the inside of the milk claw is communicated with the inside of the milk tube, and the outside air is passed through the milking hole of the teat cup through the inside of the teat cup, the inside of the milk claw and the communication hole, and the milk tube is brought into the high vacuum state. And feeding out the remaining water or milk in the milk claw and the milk tube into the vacuum pressure line by the outside air. c. Hereinafter, a step of sequentially repeating the steps a and b until the residual water or residual milk in the milk claw and the milk tube is completely sent out into the vacuum pressure line.

In the recovery method of the present invention using the recovery mechanism of the present invention, the valve is operated by the opening / closing means so that the milk inside the milk claw of the milker and the milk can be sucked in from the milking opening of the teat cup. The communication port with the inside of the tube can be closed by a valve. Then, the communication state between the inside of the milk claw and the inside of the milk tube is cut off, and the gas in the milk tube can be continuously sucked into the vacuum pressure line communicating with the inside of the milk tube. Then, the inside of the milk tube can be brought into a high vacuum pressure state. Then, step a of the recovery method of the present invention can be performed.

Next, the communication port between the inside of the milk claw and the inside of the milk tube can be opened by operating the valve by the opening / closing means. Then, the inside of the milk claw can be communicated with the inside of the milk tube. Then, from the milking port of the teat cup, the outside air can be made to project as a bullet-shaped mass into the milk tube in the high vacuum pressure state through the inside of the teat cup, the milk claw connected thereto and the communication port. Then, by the outside air, residual water or milk remaining in the milk claw and the milk tube can be sent out from the milk claw and the milk tube into the vacuum pressure line, and can be eliminated into the receiver and the like. Then, step b of the recovery method of the present invention can be performed.

Hereinafter, the above steps a and b are repeated in order, and the remaining water or milk in the milk claw and the milk tube is completely sent out into the high vacuum pressure line and discharged into the receiver and the like. it can. Then, step c of the recovery method of the present invention can be performed.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a preferred embodiment of the recovery mechanism of the present invention. FIG. 1 is a schematic structural explanatory view of a milker provided with the recovery mechanism, and FIG. 2 is a periphery of the milk claw of the milker provided with the recovery mechanism. FIG. Hereinafter, this collection mechanism will be described.

In the recovery mechanism shown in the figure, the milk line 10 connected to a vacuum pressure source (not shown) such as a vacuum pump is connected to the high vacuum pressure line 12 in the same manner as in the above-mentioned cleaning mechanism shown in FIG. Used. The inside of the milk claw 34 connected to the teat cup 32 of the milker unit 30 is connected to the above-mentioned vacuum pressure line 12 via the inside of the milk tube 36.

The milk claw 34 and the milk tube 36
The communication port 38 with the inside is provided with a valve 50 for opening and closing the communication port as shown in FIG. As the valve 50, an electromagnetic valve operated by electricity is used.

The above configuration is the same as that of the milker having the above-described cleaning mechanism shown in FIG. 6, but in the illustrated recovery mechanism, the opening and closing means 100 for opening and closing the communication port 38 by the valve 50 is used. Opening / closing means 10 for collecting residual water or milk in milk claw 34 and milk tube 36
0 is provided. The opening / closing means 100 is formed of an electronic circuit using a semiconductor chip or the like for driving and controlling the valve 50 composed of an electromagnetic valve.

The recovery mechanism shown in FIGS. 1 and 2 is configured as described above.

Next, a method of using the collecting mechanism will be described.
A preferred embodiment of the recovery method of the present invention will be described.

The opening and closing means 100, which is an electronic circuit, operates the valve 50, which is an electromagnetic valve, so that the inside of the milk claw 34 and the milk tube 36 of the milker in a state where air can be sucked in from the milking opening 32a of the teat cup. Communication port 3
8 is closed by the valve 50. Then, the communication between the inside of the milk claw 34 and the inside of the milk tube 36 is cut off, and the gas in the milk tube 36 is continuously sucked into the vacuum pressure line 12 connected to the inside of the milk tube 36. Then, the inside of the milk tube 36 is brought into a high vacuum pressure state of, for example, 60 kPa.

Next, the opening / closing means 100 comprising an electronic circuit
, The communication port 38 between the inside of the milk claw 34 and the inside of the milk tube 36 closed by the valve 50 is opened. And milk claw 34
The inside is communicated with the inside of the milk tube 36.

Then, after washing the milker,
As shown in FIG. 1, the cleaning liquid in the cleaning tank 20 into which the rear end of the cleaning liquid supply pipe 35 connected to the teat cup washer 33 to which the teat cup 32 is attached is empty. Then, the water suction port 35a at the rear end of the cleaning liquid supply pipe is exposed to the outside air. Or
As shown in FIG. 6, the cleaning liquid in the cleaning tank 20 into which the teat cup 32 has been put is in an empty state. And the milking opening 32a of the teat cup is in a state of being exposed to the outside air. And it is in the state which can inhale outside air from the milking opening 32a of a teat cup. Therefore, from the milking opening 32a of the teat cup, the outside air is
Through the milk claw 34 and the communication port 38 connected to the milk claw 34, the milk tube 36 can be made to project into the milk tube 36 in the high vacuum pressure state as a bullet-shaped mass. Then, the remaining air in the milk claw 34 and the milk tube 36 is sent out from the milk claw 34 and the milk tube 36 into the vacuum pressure line 12 by the outside air, and can be removed into the receiver and the like.

After milking using a milker, the teat cup 32 is removed from the breast and the milking opening 32a of the teat cup is exposed to the outside air. And it is in the state which can inhale outside air from the milking opening 32a of a teat cup. Therefore, from the milking opening 32a of the teat cup, the outside air is
Through the milk claw 34 and the communication port 38 connected to the milk claw 34, the milk tube 36 can be made to project into the milk tube 36 in the high vacuum pressure state as a bullet-shaped mass. Then, by the outside air, the residual milk in the milk claw 34 and the milk tube 36 is sent out from the milk claw 34 and the milk tube 36 into the vacuum pressure line 12 and passes through the milk line 12 to the receiver and the like. Can be eliminated.

Hereinafter, by repeating the above-described steps in order, the remaining water in the milk claw 34 and the milk tube 36 is completely sent out into the high vacuum pressure line 12 and is discharged into the receiver or the like. Milk claw 3
The residual milk in the milk tube 4 and in the milk tube 36 can be completely sent out into the high vacuum pressure line 12 and eliminated in the receiver or the like.

FIGS. 3 to 5 show another preferred embodiment of the recovery mechanism of the present invention. FIG. 3 is a schematic structural explanatory view of a miller provided with the recovery mechanism, and FIG. 4 is provided with the recovery mechanism. Illustration of enlarged structure around milk claw of milker, FIG.
FIG. 2 is a structural explanatory view around the opening / closing means of the milker provided with the recovery mechanism. Hereinafter, this collection mechanism will be described.

In the case of a miller equipped with the recovery mechanism shown in FIG.
As shown in FIG. 7, the sub milk claw 60 is provided adjacent to the milk claw 34 with the diaphragm 70 as a partition wall. For the diaphragm 70, an elastic film-like member having a concentric corrugated shape on a surface whose central portion is movable back and forth is used. In the sub milk claw 60,
For example, a low vacuum pressure line 80 maintained at a low vacuum pressure of 40 to 47 kPa is communicated via a pipe 82. At the center of the diaphragm 70, a valve 50 composed of a needle valve for opening and closing a communication port 38 between the milk claw 34 and the milk tube 36 is mounted.

The above configuration is the same as that of the conventional milker, but the milker having the illustrated recovery mechanism has a switching valve 90 in the low vacuum pressure line 80 as shown in FIG. Then, by operating the switching valve 90, as shown in FIG.
The inside is communicated with the inside of the low vacuum pressure line 80 via the pipe 82, or the inside of the sub milk claw 60 is communicated with the outside air via the pipe 82 as shown in FIG. I can do it. And the switching valve 90
Is operated to communicate the inside of the sub-milk claw 60 with the low vacuum pressure line 80 through the pipe 82 to suck the gas in the sub-milk claw 60 into the low vacuum pressure line 80,
By lowering the air pressure in the sub milk claw 60 or sending outside air into the sub milk claw 60 through the pipe 82,
The air pressure in the sub milk claw 60 can be increased. When the air pressure in the sub milk claw 60 is reduced, the central portion of the diaphragm 70 is moved to the sub milk claw 60 side, and the communication port 38 closed by the valve 50 attached to the diaphragm 70 is closed. It can be opened. When the air pressure in the sub milk claw 60 is increased, the central portion of the diaphragm 70 is moved to the milk claw 34 side, and the communication port 38 can be closed by the valve 50 attached to the diaphragm 70. Like that. As the switching valve 90, a vacuum pressure drive valve that can be driven and controlled using a vacuum pressure source such as a vacuum pump provided in a barn or the like is used. The switching valve 90 constitutes an opening / closing means 100 that opens and closes the communication port 38 between the inside of the milk claw 34 and the inside of the milk tube 36 by the valve 50 composed of the needle valve.

The recovery mechanism shown in FIGS. 3 to 5 is configured as described above. This is an example of the use of the collecting mechanism, and another preferred embodiment of the collecting method of the present invention is to operate the switching valve 90 composed of the above-described vacuum pressure-operated valve so that the needle valve attached to the diaphragm 70 operates. Except that the communication port 38 between the inside of the milk claw 34 and the inside of the milk tube 36 is opened and closed by the valve 50, the same as the above-described collection method using the above-described collection mechanism shown in FIGS. Is omitted.

The recovery mechanism of the present invention and the recovery method of the present invention using the mechanism can be used together with a pipeline milker, a milking parlor, and the like, in which milk is conveyed in the milk line 10 corresponding to the vacuum pressure line 12. It is possible.

The recovering mechanism of the present invention and the recovering method of the present invention using the recovering mechanism include a cleaning tank 2 as shown in FIGS.
The washing liquid stored in the milking port 32a of the teat cup is
Circulates into the teat cup 32, the milk claw 34, the milk tube 36 and the milk line 10,
A teak cup 32 as shown in FIG. 1 is attached to a teak cup washer 33 and a washing liquid in the washing tank 20 is passed through a washing liquid supply pipe 35 and a teat cup washer 33 is attached. It can be used together with a milk car having a washing mechanism for circulating and passing from inside into the teat cup 32, the milk claw 34, the milk tube 36 and the milk line 10. However, using the recovery mechanism of the present invention,
According to the recovery method of the present invention, when the residual water or milk in the milk claw 34 and the milk tube 36 is sent out and removed into the vacuum pressure line 12, the milking port 32a of the teat cup is removed as described above. The teat cup needs to be in a state in which the outside air can be sucked through the milking opening 32a of the teat cup by being exposed to the outside air.

The recovering mechanism of the present invention and the recovering method of the present invention using the mechanism are described in that the milker unit 30 including the milk claw 34 and the milk tube 36 to which the teat cup 32 is connected is connected to the vacuum pressure applied to the milk line 10. The present invention can be used for a milk car mounted on the vacuum pressure line 12 so that it can be attached to and detached from various parts of the line 12, and a milk car that is irremovably mounted at a fixed position of the vacuum pressure line 12.

In the collection mechanism and the collection method of the present invention,
As the valve 50 that opens and closes the communication port 38 between the inside of the milk claw 34 and the inside of the milk tube 36, a manual on-off valve can be used in addition to the above-described solenoid valve and needle valve. Similarly, compressed air can be used as a drive source of the opening / closing means 100 in addition to the above-described electronic circuit and vacuum pressure.

[0038]

As described above, according to the recovery method of the present invention using the recovery mechanism of the present invention, the residual water remaining in the milk claw and the milk tube after the washing of the milker is performed. After the milk is completely pumped out into the vacuum pressure line corresponding to the milk line, the milk remaining in the milk claw and the milk tube is removed from the milk claw and the milk tube after the milk is removed using a milker or the like. It can be completely and completely sent out into the vacuum pressure line corresponding to the line, and can be removed into the receiver or the like. Then, after washing the milker or milking, remove the milk tube from the milk line, lift the milk line and the milk claw connected to it by hand, and remove the residual water remaining in the milk tube and milk claw. Alternatively, it is not necessary to remove the residual milk from the milk tube or the milk claw by a great deal of labor and labor and to manually remove it.

[Brief description of the drawings]

FIG. 1 is a schematic structural explanatory view of a mill car provided with a recovery mechanism of the present invention.

FIG. 2 is an explanatory diagram of an enlarged structure around a milk claw of a milker provided with a recovery mechanism of the present invention.

FIG. 3 is a schematic structural explanatory view of a milker provided with a recovery mechanism of the present invention.

FIG. 4 is an explanatory view of an enlarged structure around a milk claw of a milker provided with a recovery mechanism of the present invention.

FIG. 5 is a schematic structural explanatory view of the opening / closing means of the milker provided with the recovery mechanism of the present invention.

FIG. 6 is a schematic structural explanatory view of a cleaning mechanism of a milker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Milk line 12 Vacuum pressure line 20 Cleaning tank 30 Milker unit 32 Teat cup 32a Milking opening of teat cup 33 Teat cup washer 34 Milk claw 35 Cleaning liquid supply pipe 36 Milk tube 38 Communication port 40 Residual water 50 Valve 60 Sub milk claw 70 Diaphragm 80 Low vacuum pressure line 90 Switching valve 100 Opening / closing means

Claims (3)

[Claims] 1. A milk claw communicating with a teat cup and a vacuum pressure line are communicated via a milk tube, and a valve for opening and closing a communication port between the milk claw and the milk tube is provided. In a milker, opening and closing means for opening and closing the communication port by the valve,
A mechanism for recovering residual water or milk in the milk claw and the milk tube, comprising an opening and closing means for recovering residual water or milk in the milk claw and the milk tube. 2. A sub-milk claw is provided adjacent to said milk claw with a diaphragm as a partition wall, and the inside of said sub-milk claw is communicated with a low vacuum pressure line. A milker equipped with the valve for opening and closing the communication port with the inside of the tube is used, and the opening and closing means communicates the inside of the sub-milk claw with the inside of the low vacuum pressure line, and the air pressure in the sub-milk claw. The diaphragm is moved to the sub milk claw side to open a communication port closed by a valve attached to the diaphragm, or to supply outside air into the sub milk claw, and And the diaphragm is moved to the milk claw side, and the communication port is closed by a valve attached to the diaphragm. Residual water or Zanchichi recovery mechanisms in the milk claw according to claim 1, wherein comprising a switching valve for Ritari and the milk tube. 3. A method of using the mechanism for recovering residual water or milk in a milk claw and a milk tube according to claim 1 or 2, wherein the method includes the following steps. A method for collecting residual water or milk in a tube. a. Operate the valve by the opening and closing means to close the communication port between the milk craw and the milk tube of the milk car in a state where the outside air can be sucked from the milking port of the teat cup, and the communication state between the milk claw and the milk tube And continue to suck the gas in the milk tube into the vacuum line,
A step of bringing the inside of the milk tube into a high vacuum pressure state. b. After the step a, the communication port is opened by operating the valve by the opening / closing means, the inside of the milk claw is communicated with the inside of the milk tube, and the outside air is supplied from the milking port of the teat cup to the inside of the teat cup and the inside of the milk claw. And through the communication port,
Rush into the milk tube in the high vacuum pressure state,
Sending the remaining water or milk in the milk claw and milk tube into the vacuum pressure line by the outside air. c. Hereinafter, a step of sequentially repeating the steps a and b until the residual water or residual milk in the milk claw and the milk tube is completely sent out into the vacuum pressure line.