JPS629801Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic pulsator that controls the vacuum pressure (negative pressure) supplied to the Teit cup via the claw of a mechanical milking machine.

With conventional electromagnetic pulsators, both the number of negative pressure pulsations and the pulsation ratio are electronically stabilized in the drive circuit, allowing the solenoid valve to be turned on and off.
The period and ratio were fixed, and thus the characteristics of the negative pressure supplied to the Teit cup were fixed. In addition, the negative pressure supply method can be classified into various types, such as 4 nipples 1 action, alternating left and right, alternating front and back, etc., but in all cases, the pulsating waveform of negative pressure was as shown in Figure 1. .

In FIG. 1, the period x when the negative pressure is strong is the milking period, the period y when the negative pressure is weak is the resting period, and the pulsation ratio is expressed as x:y.

By the way, when determining the pulsating waveform of negative pressure as described above, if emphasis is placed on milking speed, the milking period (duty ratio of the solenoid valve) should be increased, and conversely, if safety to the teats is considered It is necessary to reduce the duty ratio, but in all conventional systems the duty ratio remains unchanged, so it is necessary to set the duty ratio at the expense of either milking speed or teat safety. However, there was a problem that it was not always possible to carry out rational milking operations.

The present invention was made to solve these conventional problems, and it constantly monitors the milk volume and optimally controls the duty ratio (negative pressure pulsation ratio) of the solenoid valve according to the milk volume. In this way, an electromagnetic pulsator for milking is provided which can maintain a good milking speed and sufficiently increase safety to teats.

The present invention will be explained in detail below based on an embodiment shown in FIGS. 2 and 3.

In the figure, a reference pulse generation circuit 2 equipped with a crystal oscillator 1 outputs a reference pulse a that turns on and off at regular intervals as shown in FIG. 3 to a counter 3. Based on the reference pulse a, the counter 3 outputs a reference pulse b having a waveform as shown in FIG. 3, and three correction pulses c, d, and e. Then, a first control pulse f, which is a combination of the reference control pulse b and the first correction pulse c in the exclusive OR circuit 4, a second control pulse g, which is the same as the reference control pulse b, and a second control pulse f, which is the same as the reference control pulse b, 2. OR the third correction pulse d and e
The third and fourth control pulses h and i obtained by combining the circuits 5 and 6 are supplied to the selection circuit 7, respectively.

On the other hand, a flip-flop circuit 8 is provided to which milk volume data l and m outputted from a milk volume detection device (not shown) is supplied.
The selection signals j and k outputted from the selection circuit 7
By supplying the control (drive) pulses from the selection circuit 7 to the solenoid valve 10 via the drive circuit 9, the control (drive) pulses are optimally controlled according to the amount of milk produced. Note that since the selection signals j and k supplied from the flip-flop circuit 8 to the selection circuit 7 are triggered by the reference control pulse b, no selection operation is performed during one cycle of the pulse b. There is. Incidentally, as the lactation amount detecting device, a conventionally known electronic milk meter, a flow rate detecting device using electrodes, a flow meter using capacitance, ultrasonic waves, infrared rays, etc. can be used.

In the above configuration, the flip-flop circuit 8
When the selection signals j and k output from the control circuit 9 change depending on the amount of milk produced, the duty ratio of the control pulse supplied to the drive circuit 9 becomes smaller as the amount of milk decreases.

That is, when the milk production is at its highest, a control pulse with the largest ON time ratio (duty ratio) is supplied to the drive circuit 9, such as the fourth control pulse i, so that the solenoid Since the time ratio of ON of the valve 10 increases, the time ratio of strong pulsation (pulsation ratio) of the negative pressure that changes in intensity increases. Furthermore, as the amount of milk decreases, the duty ratio of the control pulse decreases according to the degree of decrease, so the time ratio of the milking period decreases and the rest period becomes longer.

For this reason, the temporal ratio of the pulsation ratio (suction phase) becomes longer in cows that are lactating a large amount of milk or in the early stages of milking when there is a large lactating amount, so that the milking speed is improved and at the same time, the milking unit and the like are prevented from falling. When the lactation volume decreases, the selection signal supplied from the lactation detection device to the selection circuit via the flip-flop circuit changes and the time rate of the suction phase becomes shorter, thereby protecting the nipple.

In the embodiment, the pulsation ratio of the negative pressure output from the solenoid valve (duty ratio of the control valve) is changed in four stages, but at least two or more types of duty ratios are used. It's good to have. Further, the switching of the duty ratio does not necessarily have to be performed automatically, and may be performed manually based on an instruction from a pilot lamp or a buzzer, for example.

As explained above, according to the present invention, the duty ratio of the control pulse is variably controlled during milking according to the lactation amount, and the pulsation ratio of the pulsator is optimally controlled. The control of the milking machine can be streamlined by protecting the teats without the need for

[Brief explanation of the drawing]

FIG. 1 is a pulsation waveform diagram of a conventional example, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a signal waveform diagram of each part of the same. 2...Reference pulse generation circuit, 3...Counter,
4...exclusive OR circuit, 5,6...OR
Circuit, 7... Selection circuit, 8... Flip-flop circuit, 9... Drive circuit, 10... Solenoid valve.

Claims (1)

[Scope of utility model registration request] An electromagnetic pulsator for milking that has a reference pulse generation circuit that outputs a reference pulse that turns ON and OFF in a predetermined cycle, and a circuit that outputs a plurality of control pulses with different duty ratios based on the reference pulse output from the circuit. An electromagnetic pulsator for milking, characterized in that it includes a selection circuit that outputs a control pulse with an optimum duty ratio to a solenoid valve based on the output of a means for detecting the amount of milk during milking in each dairy cow.