Without a vacuum pump for the milking machine, no system will work. It can be safely called the heart of the whole unit. Novice farmers often face the challenge of choosing this equipment. There are lots of offers and each seller praises his own. Therefore, we decided to clarify in an accessible form what the choice of this or that model depends on and what can break down in such equipment. Also, this information will be useful to those who decided to assemble the device with their own hands.
Components and types of devices that create pressure
The vacuum system used in the milking machine, regardless of the manufacturer, consists of the same components. This includes a cylinder, on the basis of which a vacuum is created, in fact, the vacuum pump itself, the monitoring equipment (vacuum gauge), the pulsator and the vacuum regulator for the milking machine. By the way, the last node is one of the most important.
For normal milk yield in the teat cups, an optimal pressure must be created, and it is 0.48 bar.
The vacuum pump should create a variable vacuum with exactly this indicator. If there is more, it means that the nipples will be injured in the cows, and if the index falls below the permissible rate, the glasses fall off. The periodicity is created by the pulsator, it fluctuates within 45-65 cycles per minute. A pulsator is a small valve that is quite simply adjustable and rarely breaks.
And here we come to the most important point, which determines the normal operation, namely the types of pumps:
- vacuum milking unit with a dry rotor;
- oil vacuum apparatus;
- water ring vacuum apparatus.
Immediately warn self-made - with your own hands, you can only assemble ready-made nodes, you cannot make nodes from scratch.
If you are interested in other types of equipment for livestock farms, then the article "On dairy pumps" will be useful to you.
Here we are faced with the first trick of sellers. In addition to creating optimal pressure, there is such an indicator as productivity. For an individual milking machine, i.e., we milk one cow, with one machine, it is 110 l / min. If you are going to milk two cows at the same time with one machine, then the capacity should be 220 l / min. And so on increasing.
For economy, private owners are recommended to take a pump with a dry rotor at 110 l / min and milk the cows in turn. But for some reason they are silent about the fact that such milking leads to overheating of the equipment, and for such devices it is very important.
Blades in such aggregates are graphite. This lubricant really has a very high coefficient of sliding, which is the cause of silent operation. But during long-term operation, the blades overheat and can deform. Simply put, the pump pretty quickly wedges. And when contacting the service center you may be accused of violating the operating conditions and denied warranty service.
We conclude that vacuum devices with a graphite dry rotor are a good thing, but on condition that you have no more than 2-3 cows on the farm.
Myths and truth about oil systems
If we compare the principle of operation of oil and dry aggregates, then structurally they differ little. Just in these pumps, instead of a graphite one, a textolite paddle boiled in oil was installed.
Plus there is a constant circulation of oil. As a result of this innovation, it acts not only for its intended purpose, that is, lubrication, but also provides heat removal and prevents overheating.
The most common myths concerning such oil systems are rumors about the allegedly complicated adjustment and high lubricant consumption. We can assure you that adjustment in such systems is no more difficult than in dry ones. And fables about wasteful use are most likely invented by competitors.
Therefore, for small farms, where individual milking of cows with one machine is provided, it is better to take the oil system. As practice shows, such a vacuum pump can operate without interruption for cooling up to 3-4 hours.
Water ring pumps are installed on the milking rooms with the simultaneous maintenance of more than 6-8 cows. As the name implies, water acts as the working fluid in them, and maintaining its set temperature requires the installation of additional equipment and tracking sensors.
In water ring pumps, vacuum regulators for milking machines are complex multicomponent devices, and the setting here requires some preparation. We do not recommend taking such equipment for farms with less than 50 head of livestock. And on individual devices, such pumps are not installed at all.
The choice of vacuum equipment for milking systems of cattle is a delicate matter, but with a strong desire in this matter you can figure out. The main thing for you to determine the number of goals, the time of the pumps and the sequence of milking.
Share the article with friends on the network and maybe your like will save someone from a mistake when choosing a vacuum pump.
Tell us in the comments if you had to use such systems.