What is a portable milking machine?
A portable milking machine is a compact, mobile milking unit that can be used independently of the fixed milking installation. The unit consists of a vacuum pump, a milking cluster with teat cups, and a collection bucket, mounted on a wheeled frame. This allows you to easily bring the portable milking machine to wherever the animal is standing, rather than bringing the animal to the milking parlour or robot.
The machine is primarily used for individual or exceptional animals: cows in the sick bay, animals that have just calved, or cows that for some other reason cannot follow the normal milking routine. Also suitable for goats and sheep (special versions available).
How does a portable milking machine work?
The principle is the same as a fixed milking installation, but in a miniature, mobile format. The vacuum pump creates negative pressure in the system, causing the teat cups to draw milk from the udder. The milk flows directly through the milk tubes into the collection bucket, which is attached to the frame.
Oil-lubricated pumps
Many portable milking machines use an oil-lubricated vacuum pump. This type of pump is known for its long service life and low susceptibility to failure, as the oil provides lubrication and cooling of the moving parts. The downside is that you need to check the oil level regularly and replace it in time, otherwise wear will actually increase.
Parts and maintenance
A portable milking machine is a mechanical system with moving parts that are subject to wear. To prevent breakdowns and maintain the vacuum performance, periodic maintenance is required.
Replacing the graphite vane
The vacuum pump of a portable milking machine often works with a rotor and graphite vanes that rotate against the wall of the pump housing. These vanes wear down due to constant friction and must be replaced over time. A worn vane can be recognised by a declining vacuum, increased noise from the pump, or a noticeably reduced milk flow. Depending on the type of portable milking machine and the dimensions of the pump housing, various sizes of graphite vane are available, for example a vane of 55x38x5 mm, a version of 65x45x4.8 mm or a larger size of 70x42.9x5 mm. Always check the exact model of your pump before replacing, so that you fit the correct size.
For some portable milking machines, such as the CT type, a separate graphite vane specifically for the CT version is also available. It is advisable to replace vanes as a complete set rather than a single vane, as uneven wear between old and new vanes can disrupt the balance of the pump.
Other maintenance
In addition to the graphite vanes, the following points also deserve regular attention:
- Check the oil level of the vacuum pump and replace it in time
- Inspect milk tubes and liners for cracks or porosity
- Clean the milk bucket and milking cluster after each use to prevent bacterial growth
- Read the vacuum gauge to check whether the correct vacuum level is being achieved
By scheduling this maintenance on a structural basis, you prevent breakdowns from occurring at exactly the moment you need the portable milking machine.
Portable milking machine for goats and sheep
Compact milking solutions are also available for small ruminants. These work on the same principle as the portable milking machine for cows, but with a milking cluster suited to the smaller udder shape of goats and sheep.
What should you look for when purchasing a portable milking machine?
A few practical points are important when choosing a portable milking machine:
- Capacity: will you be milking one animal or multiple animals at the same time? This determines whether you choose a single or double unit.
- Type of vacuum pump: an oil-lubricated pump is often more durable, but requires regular oil maintenance. Ask what type of maintenance is required for the chosen model.
- Mobility: check whether the frame is sturdy enough for your barn type and whether the wheels are suitable for the floor surface on which you will use the machine.
- Availability of parts: a portable milking machine can last for many years, provided you can replace wear parts such as graphite vanes and liners in time.
- Noise and vibration: especially when used in the sick bay or calving pen, a quietly running pump is pleasant for both the animal and the operator.
A portable milking machine is not a replacement for a fixed milking installation, but a supplement to it for specific situations. By maintaining the unit properly and replacing worn parts in time, it will remain usable for many years for those moments when you need to milk an animal separately.
Frequently asked questions about the portable milking machine
How often should I replace the graphite vane in my portable milking machine?
This depends on usage, but with daily use it is wise to check every few months. If you notice a reduced vacuum or increased noise from the pump, check the vanes immediately.
Can I also milk goats or sheep with a portable milking machine?
Yes, with an adapted milking cluster suited to the udder shape of small ruminants, you can use the same vacuum pump for cows and goats. There are also specific portable milking machines available for goats and sheep!
What is the advantage of an oil-lubricated vacuum pump?
An oil-lubricated pump is less prone to breakdowns and generally lasts longer than a dry-running pump, provided the oil level is checked regularly and changed on time.
How do I know which size graphite vane I need?
Check the model and dimensions of your vacuum pump before ordering a vane. Different pump housings require different sizes, such as 55x38x5 mm, 65x45x4.8 mm or 70x42.9x5 mm.