EP3855903A1

EP3855903A1 - Container for use in distribution of a liquid substance, device and animal accommodation provided with container, and method for distribution of liquid substance

Info

Publication number: EP3855903A1
Application number: EP18830320.0A
Authority: EP
Inventors: Benardus Johannes WIT
Original assignee: Holding Krulstaart BV
Current assignee: Holding Krulstaart BV
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2021-08-04
Also published as: WO2020067874A1

Abstract

The invention relates to a container (500) for use in distribution of a liquid substance, device and animal accommodation provided with container (500), and a method for distribution of liquid substance. The container (500) comprises: • - a cattle feed container structure (502) provided with at least one opening (504) for supply and/or discharge of liquid cattle feed; and • - a flow channel (506) extending at an angle to a horizontal plane in the structure, wherein the flow channel (506) is configured to contain and/or feed through liquid cattle feed; • - a connection (508) for connecting to a pressure-generating device, such as a pressure pump or pressure conduit, wherein the connection is operatively connected to the flow channel (506) in order to pressurize it during use of the cattle feed container, such that liquid cattle feed can be contained and/or fed through under pressure in the flow channel.

Description

CONTAINER FOR USE IN DISTRIBUTION OF A LIQUID SUBSTANCE, DEVICE AND ANIMAL ACCOMMODATION PROVIDED WITH CONTAINER, AND METHOD FOR

DISTRIBUTION OF LIQUID SUBSTANCE

The invention relates to a container for use in a device for distributing a liquid substance. The liquid substance is for instance a liquid, such as water, or a mixture of liquids and/or solid substances, such as milk or mash. The liquid substance can particularly be a liquid cattle feed, such as milk or mash for feeding piglets.

Diverse devices are known in practice for distributing liquid cattle feed, such as milk or mash, to a number of draw-off points. Such a system is for instance applied for feeding piglets. Providing milk and/or mash in the animal accommodation results among other things in fewer stragglers, i.e. fewer piglets showing insufficient growth. In known systems the feed is pumped around continuously, from a central feed mixer, in a ring conduit. A drawback of these conventional devices is that the pump is a vulnerable component which is prone to malfunction and susceptible to wear.

In order to obviate these drawbacks, the Netherlands patent application NL 2016048, which is included herein as a whole by way of reference, provides a pneumatic pump system in which the liquid substance is pumped with gas pressure. The pump system is equipped here with at least two containers between which the liquid substance is pumped back and forth.

It has been found in practice that proper cleaning of the containers of the pneumatic system is difficult, whereby the hygiene of the system cannot be sufficiently guaranteed. Automatic cleaning without the container being opened is in particular found to be insufficiently possible to achieve a hygiene cleaning. In addition, settling also occurs in the containers according to NL 2016048. This is a process wherein solid particles present in the liquid cattle feed settle. Separation hereby occurs in a container according to NL 2016048, and a layer with many solid particles forms at the bottom of the container and a layer with few solid particles at the top of the container. The result is that the cattle is first fed only‘thick’ liquid cattle feed and later on only‘thin’ liquid cattle feed. This is undesirable, since a consistent supply of feed (in respect of consistency) is important.

An object of the invention is to obviate or at least reduce the above stated drawbacks and to provide an improved container for a device for distributing a liquid substance such as liquid cattle feed.

This object is achieved with the cattle feed container for liquid cattle feed for use in a device for distributing liquid cattle feed according to the invention, the cattle feed container comprising: a cattle feed container structure provided with at least one opening for supply and/or discharge of liquid cattle feed; and

a flow channel extending at an angle to a horizontal plane in the structure, wherein the flow channel is configured to contain and/or feed through liquid cattle feed; a connection for connecting to a pressure-generating device, such as a pressure pump or pressure conduit, wherein the connection is operatively connected to the flow channel in order to pressurize it during use of the cattle feed container, such that liquid cattle feed can be contained and/or fed through under pressure in the flow channel.

The advantage of the cattle feed container for liquid cattle feed according to the invention is that a flow channel is formed which extends at an angle to a horizontal plane. The use of a flow channel extending at an angle instead of a reservoir-like container prevents an accumulation of settled solid particles in a lower side of the container. Settling can only take place locally in the flow channel, wherein the solid particles do not accumulate but settle over the length of the flow channel. This ensures the distribution of the solid particles in the liquid cattle feed. In addition to this, the pressure in the flow channel is increased as soon as the liquid cattle feed is withdrawn from the container. The solid particles settled in flow channel are then substantially entrained by the outflowing liquid. This achieves a consistent supply of feed and prevents accumulation and/or caking of cattle feed. In addition, the cattle feed container according to the invention can be cleaned efficiently and in simple manner in that the flow channel can be flushed wholly under pressure and/or with force. A further advantage of the cattle feed container according to the invention is that it can be manufactured in relatively simple manner, whereby the costs of such a container according to the invention are similar to or lower than the costs of conventional containers for liquid cattle feed.

The cattle feed container according to the invention can be applied both in conventional devices as accumulator for equalizing the pressure in the ring conduit, and can be applied in devices as described in patent application NL 2016048. The advantage of using the container according to the invention as accumulator as compared to conventional accumulators is that forced and/or controlled flow takes place in the flow channel. This has a positive effect in the cleaning of the container. In addition, it is the case that the container according to the invention can be embodied as container with one or more openings. In the case that more openings are applied, the container, both when used as pressure vessel and when used as accumulator, is fully flushable and can thereby be cleaned better and more easily.

Providing a connection for one or more pressure connections, or a plurality of connections which are each suitable for connecting to a pressure -controlling device, enables the cattle feed container to be applied in different devices for distributing liquid cattle feed. Use is preferably made here of gas pressure. The cattle feed container according to the invention is preferably adjusted to the properties of the liquid cattle feed to be pumped, such that the liquid cattle feed can still be pumped and/or transported through the container at a preset pressure. This means that the container can be configured differently, for instance at a different angle of inclination, in the case of a liquid cattle feed with a high concentration of solid substance (high dry substance content) than in the case of a liquid cattle feed having a lower concentration of solid substance, because this latter has increased flowability under the same conditions, such as pressure.

The angle of inclination of the flow channel of the cattle feed container according to the invention preferably amounts to an angle of inclination of 3° to 80°, more preferably of 3° to 60° and most preferably an angle of 3° to 40°. The angle of inclination can be determined subject to the application, the pressure to be applied in the cattle feed container and the properties of the liquid cattle feed to be used. It is preferably assumed that a greater angle of inclination is necessary for a liquid cattle feed with a larger quantity of solid substance, i.e. a liquid cattle feed which is more difficult to transport or has decreased flowability.

In an embodiment according to the invention the container can be provided with a heating device.

In order to realize a relatively constant temperature of the liquid cattle feed the container can be provided with a heating device. Liquid cattle feed can thus be supplied to the cattle at a determined minimum temperature throughout the whole year. Such a heating device can be applied in or at the container in diverse ways. It is thus possible to opt to arrange a housing around the structure, wherein the housing can be filled with warm water. A so-called warm water bath is hereby formed, whereby the liquid cattle feed is heated when it flows through the structure.

Alternatively, it is also possible to opt to arrange a heating element, for instance an electric heating element, in, on or around the structure, whereby the liquid cattle feed can be heated in controlled manner.

A further alternative is the use of a housing or structure which is inherently heat- conductive, wherein the structure and/or the container is used to conduct heat and in this way heat the liquid cattle feed in the container.

Yet another alternative comprises a heat exchanger provided in the flow channel.

In an embodiment according to the invention the container can be provided with one or more sensors for measuring one or more of the liquid level in the container, the composition of the liquid, the temperature of the liquid, the pressure in the container and/or the flow rate of the liquid through the container.

By providing the cattle feed container with sensors an accurate check of the state of the liquid cattle feed present in the cattle feed container or fed therethrough can be performed. The sensors are preferably configured to detect whether a level of the liquid substance in the relevant container lies below or above a predetermined level, so that it is known whether filling up with liquid cattle feed is necessary. Such a sensor can be embodied as a conductivity sensor or resistivity sensor, an inductive sensor, a distance sensor, a weight sensor or a capacitive sensor.

The sensors generate a signal which is indicative of a level of the substance in the containers. The sensors are for instance configured to detect whether the level of the substance lies below or above a predetermined level. A conductivity sensor is for instance arranged in the relevant container. If the conductivity sensor detects no liquid substance, the liquid substance therefore lies below the sensor, i.e. below a predetermined minimum level. In another example a distance sensor is used to determine the height to which the liquid substance is present in the container. The measurement is in this case quantitative, and the level of the substance can be expressed as distance measure, for instance in centimetres.

The sensors can also be configured to make the container controllable as part of a device or process.

Alternatively or additionally, the sensors can also measure other physical properties of the liquid cattle feed. Preferably envisaged here are measuring of the temperature in order to supply liquid cattle feed to the cattle at a relatively constant temperature and/or a sensor for measuring the composition of the liquid cattle feed in order to determine whether the composition is satisfactory for the cattle to which the liquid cattle feed is supplied by means of a device in which the container is arranged.

Additionally or alternatively, it is further possible to opt for a sensor for detecting cleaning agent in order to prevent cleaning agent remaining and/or being present in the container when the device is switched on to provide cattle with liquid cattle feed.

In an embodiment according to the invention the cattle feed container is further provided with at least two sensors which are arranged close to opposite outer ends of the flow channel, and a control unit configured to control the pressure in the container on the basis of the sensor output of the sensors.

Measuring one or more parameters of the cattle feed flowing through or present in the container makes it possible to determine whether there is a difference in quality and/or composition of the cattle feed between a first and a second outer end of the cattle feed container. Using the control unit it is then possible to vary the pressure on the basis of the data from the sensors in order to keep the cattle feed supply to a distribution device for the cattle feed constant. Such an embodiment is mainly advantageous if the quality and/or composition of the cattle feed in the cattle feed container is not homogenous and varies (greatly).

In an embodiment according to the invention the structure can be a tube or hose wound in a spiral shape, wherein the spiral shape extends round a central axis. An advantage of this embodiment is that the manufacture of the container can be realized in simple and efficient manner by winding a hose or tube in a spiral shape. Use is preferably made here of a food-grade tube or hose so as to improve the cleaning and hygiene. In addition, use is preferably made of a transparent hose or tube, whereby the cattle feed container can also be visually inspected during and after use and/or during and after cleaning of the cattle feed container. A further advantage is that use can be made of known materials which can be obtained at relatively low cost. It is hereby possible to manufacture the container at low cost, which is especially important in cattle farming.

In a preferred embodiment the tube or hose is wound round a core, preferably a cylindrical core, whereby the container obtains additional strength. In addition, in such an embodiment it is also possible to opt to arrange additional functions in the core, such as a heating element and/or sensors. A compact, more easily installed container which is simple in use can hereby be realized. By arranging at least one temperature sensor and a heating element the temperature of the cattle feed in the cattle feed container can be kept substantially constant.

In another embodiment according to the invention the structure can be a block-shaped or cylindrical solid structure which is provided with an integrally formed flow channel extending along a spiral-shaped path between the opening and a second opening in the structure, wherein a cross-section of the flow channel, as seen in a direction perpendicularly of a flow direction, has a substantially circular form.

A circular cross-section has the advantage that it has no corners which promote settling or accumulation of cattle feed, whereby the throughflow becomes as optimal as possible.

An alternative to using a tube or hose which is optionally wound round a core is to use a structure in which the flow channel is integrally formed. The advantage of such a structure is that it is easy to manufacture and that additional functions can already be integrally incorporated into the structure during manufacture. Because the container is formed from one integral part, it is robust and reliable. A further advantage is that the manufacture can be performed using widely available techniques such as 3D printing, from different materials. Use is preferably made of plastic. Use is preferably made of a transparent or semi-transparent material. Use is most preferably made of a transparent plastic.

In an alternative embodiment the cattle feed container structure can also comprise a substantially elongate pipe or tube, for instance a stainless steel tube, which is wound or formed in a spiral shape.

In an embodiment of the cattle feed container according to the invention a side wall of the flow channel can be provided with a flow-enhancing coating, preferably a hydrophobic coating and more preferably a hydrophobic, food-grade coating. The invention further relates to a device for distributing a liquid substance, such as liquid cattle feed, comprising: a first container, comprising a cattle feed container according to the invention;

a second container for containing the liquid substance;

a conduit which connects an opening of the cattle feed container to the second container for transport of the liquid substance from the first container to the second container, wherein the conduit is provided with a number of draw-off points; a pump system for pumping the liquid substance between the containers; a pneumatic system connected operatively to the first container and configured to adjust the gas pressure in the first container; and

a control mechanism for controlling the pump system and/or the pneumatic system, wherein the device comprises at least a pumping state and a feeding state, wherein the pneumatic system is configured to control the pressure in the first container, when the device is in the feeding state, such that the pressure in the conduit is substantially constant.

The same advantages and effects as described above in respect of the device according to the invention apply for the device according to the invention.

For the device according to the invention it is the case that the draw-off points for instance each debouch into a trough for the purpose of distributing cattle feed. The draw-off points comprise for instance a valve which is controlled on the basis of a sensor which registers the quantity of feed in the trough. In another example the draw-off point is connected to a trough with a so-called nipple or valve, wherein feed is admitted into the trough when an animal presses against the nipple.

An advantage of the device according to the invention is further that a feeding state can be achieved with this device, in which the pressure in the conduit to the draw-off points is relatively constant. The constant pressure means that the pressure in the conduit is substantially the same both on the upstream side (close to the first container) and on the downstream side. In conventional devices provided with a pressure conduit in which the liquid cattle feed is pumped around there is a considerable pressure gradient over the length of the conduit. The pressure is here very high at the beginning of the conduit and very low at the end of the ring conduit. The dispensing of liquid cattle feed via the draw-off points is thereby not constant over the whole length of the conduit. Instead, a large amount of cattle feed is provided via the draw-off points at the beginning of the conduit and a small amount of cattle feed via the draw-off points at the end of the conduit. Such a pressure drop is prevented in the device according to the invention, wherein the conduit with draw-off points of the device in the feeding state has a substantially constant pressure which is the same over substantially the whole length. All draw-off points are hereby provided evenly with liquid animal feed.

In an embodiment it is also possible to opt to apply a pressure in the conduit at the start of the feeding state, after which the pressure is not actively controlled. The pressure in the conduit will hereby decrease slowly during the feeding state due to the withdrawal of cattle feed through the draw-off points. It is particularly in the case of shorter conduits and/or fewer draw-off points that active adjustment of the pressure is not necessary in order to keeping the pressure in the conduit substantially constant.

The pneumatic system preferably comprises a compressed air supply, i.e. a supply for air under pressure. A supply of another gas or gas mixture, such as C0₂ and/or N₂, is however also possible. It is noted that the device according to the invention can also operate with unconditioned air, such as animal accommodation air or outside air. In conventional devices for feed distribution use is usually made of an air-driven diaphragm pump. In order to prevent jamming of the diaphragm pump due to contaminated air, the air for driving the diaphragm pump has to be conditioned, for instance by means of an air drier. Such air treatment installations are however expensive. In addition, such air treatment installations are not readily available in all parts of the world. An air treatment installation is not required in the device according to the invention.

Conditioned air or another conditioned gas can if desired however also be applied in the device according to the invention.

In an embodiment according to the invention one or more of the containers and/or the conduits can be provided with sensors. The sensors can be used here to measure a level of liquid cattle feed in one of the containers, but can also be configured to co-act with the control mechanism for the purpose of controlling the pump system and/or the pneumatic system in order to control the pumping state and/or the feeding state. The sensors can here be arranged at various locations in the device, and are preferably arranged at least partially in one or more containers. In an additional and/or alternative embodiment the control system can be configured to control the device on the basis of a predetermined and/or preprogrammed time-based switching program, wherein the pressure in the device is adjusted on the basis of the selected program. It is for instance possible here to envisage setting a time schedule program comprising the time interval between pumping and feeding state, as well as the duration of the relevant states, or setting a cleaning procedure to be performed regulary.

In addition to the pumping and the feeding state, the device can in an embodiment also comprise other states, such as a rest state and/or cleaning state. The device according to the invention preferably also comprises a cleaning state. The cleaning of the device can take place by introducing cleaning agent and/or water into the device, for instance by introducing cleaning agent into one of the containers, after which the device is brought into the pumping state. After the pumping state, the device is brought into the cleaning state, wherein no pressure is applied in the system. The cleaning is achieved by alternating pumping state and the cleaning state. Use is preferably made here of a preset time interval for alternation of the two states. In a device wherein the pumping is carried out by means of pressurizing the first container, it is for instance possible to opt to introduce cleaning agent and/or water into one of the containers, after which the cleaning agent and/or water is pumped into the device. After the device is pressurized by increasing the pressure in the first container, the pressure in the device, particularly the first container, is brought to atmospheric pressure in the cleaning state. The cleaning state is then followed by the pumping state, wherein the device is pressurized and the cleaning agent and/or the water is pumped through the device. An alternation of the two states thereby provides for an efficient and effective cleaning. The pressure in the device is here preferably brought to a relatively high level in the pumping state so that the conduits and the containers are cleaned of deposits and/or liquid cattle feed residues in effective manner. In an embodiment according to the invention the second container can be a cattle feed container according to the invention, wherein the pump system can be formed by the pneumatic system and wherein the control mechanism is configured to control the pneumatic system in a pumping state to increase the gas pressure in the first container relative to the gas pressure in the second container, so that liquid substance flows from the first to the second container or vice versa.

An advantage of this embodiment is that the pneumatic system pumps the substance pneumatically, i.e. on the basis of gas pressure. By pumping the liquid substance with gas pressure, there are no moving parts of the pump which come into contact with the substance to be pumped, as there are in conventional devices. The device according to the invention hereby requires little maintenance.

A further advantage of the invention is that the system can be cleaned with warm water. The device can for instance be cleaned with water of more than 30° Celsius, more than 40° Celsius, more than 50° Celsius or even more than 60° Celsius. This is not possible in determined conventional devices since the pump which is present in the conduit is not resistant to such temperatures. It is noted that the water for cleaning cools in the conduit(s) of the device. The water will have cooled considerably in the parts of the conduit system situated a certain distance from the warm water supply. Because hot water can be used according to the invention, the water is however also sufficiently warm for effective cleaning in the remote conduit parts of the device.

A cleaning agent can if desired be used to clean the device. The device according to the invention has the advantage here over conventional devices that warm or hot water can be used, this increasing the effectiveness of the cleaning agents. The conduit and the containers can hereby be cleaned more effectively. It is moreover possible to suffice with fewer cleaning agents if desired.

A further advantage of the device according to the invention is that it is low-noise. This is because the pneumatic pumping produces less sound than if a pump with moving parts were used.

In a system with two containers the control mechanism preferably switches in each case between the pumping state and feeding state so that, between the pumping back and pumping forth, the liquid substance can be supplied to the draw-off points (and thus the cattle) under constant pressure in the feeding state. The control mechanism is preferably configured to set the gas pressure in the individual containers and to control the direction of the transport of the substance between the containers.

In an embodiment according to the invention the device can comprise a heating means for heating the substance in at least one of the containers, wherein the heating means preferably comprises at least one heated bath in which at least one of the containers is placed.

As alternative or in addition to a heating device in the first container, a device can be provided with a heating means for bringing the substance in the device to and/or keeping the substance in the device at the desired temperature.

In an embodiment according to the invention the device can further comprise a second conduit which connects the second container to the first container for transport of the liquid substance from the second container to the first container, wherein the pump system is arranged in the second conduit. The device can further comprise a shut-off valve which is arranged in the conduit downstream of the draw-off points and can be switched between a closing position and a position allowing passage, wherein the control mechanism is configured to keep the shut-off valve in the position allowing passage in the pumping state of the device so that liquid substance can be transported through the first and second conduit, and wherein the control system is configured to keep the shut-off valve in the closing position in the feeding state of the device and to control the pressure in the first container such that the pressure in the conduit is substantially constant.

By application thereof in a conventional device for distributing liquid cattle feed the cattle feed container according to the invention results in an improved device. In this embodiment of the device the cattle feed container is employed as accumulator, wherein the pump system is switched off during the feeding state and the pressure in the conduit with draw-off points is realized by a combination of adjusting the pressure in the first container and bringing the shut-off valve into the closing position.

The advantage of the device according to this embodiment is that the pump need not be kept in continuous operation, but can be switched off in the feeding state. This can increase the lifespan of the pump and, with this, decrease the costs of the device. A further advantage of the device according to this embodiment is that it can be realized relatively easily by converting an existing system provided with a ring conduit and a pump. The reliability and lifespan of the existing system can be increased with a low investment.

In an embodiment according to the invention the device can further comprise a second conduit which connects the second container to the first container for transport of the liquid substance from the second container to the first container, wherein a shut-off valve which can be switched between a closing position and a position allowing passage is arranged in the second conduit. The device can further comprise a second shut-off valve which is arranged in the conduit downstream of the draw-off points and which can be switched between a closing position and a position allowing passage. In this device according to the embodiment of the invention the control mechanism can be configured to keep the shut-off valves in the position allowing passage in the pumping state of the device so that liquid substance can be transported through the first and second conduit, and wherein the control system is configured to keep the shut-off valves in the closing position in the feeding state of the device and to control the pressure in the first container such that the pressure in the conduit is constant.

The advantage of this embodiment of the device is that it forms a relatively simple system without moving parts, such as a pump, or the need to install two individual cattle feed containers according to the invention. With this embodiment the providing of liquid cattle feed to the first container from the second container is realized by means of the force of gravity. The pumping around of the liquid cattle feed is then realized by opening the shut-off valve in the first conduit and increasing the pressure in the first container. During the feeding state both shut-off valves are closed and the pressure in the system is kept constant by controlling the pressure in the first container. The device according to this embodiment is thereby relatively simple and can be applied in combination with existing ring conduits.

In an embodiment according to the invention the first container can be provided with a venting valve and with a supply valve which is connected to a gas supply of the pneumatic system, wherein the control mechanism is configured to control the gas pressure in the first container by controlling the valves of the relevant container.

In other words, the gas pressure of the first container is set by the control mechanism by controlling a venting valve and a supply valve of the relevant container. When two containers according to the invention are applied, each container preferably comprises a venting valve and a supply valve which is connected to the gas supply of the pneumatic system, and the control mechanism is configured to control the gas pressure in each of the containers by controlling the valves of the relevant container. The supply valve can be connected to a pressure regulator for controlling the pressure supplied to the container or can be connected to a plurality of pressure conduits which can each supply pressure individually via the supply valve. Use is preferably made of a pressure regulator for providing a relatively high pressure, for instance in the range of 6-16 bar, for pumping the liquid cattle feed and cleaning the device, and for providing a relatively low pressure, for instance in the range of 0.5-4 bar, preferably 2 bar, for keeping the conduit with draw off points under constant pressure during the feeding state.

In an alternative embodiment according to the invention the container is provided with a venting valve and a supply valve for controlling the gas pressure in the relevant container. The pressure conduit can be provided here with a pressure regulator, wherein only one pressure conduit is connected to the container. Use is however preferably made of a plurality of pressure conduits, each supplying their own predetermined pressure and each being operatively connected to the container by means of a supply valve. In this alternative the control mechanism is configured to open and/or to close the supply valves in order to control the pressure supply to the container. It is hereby not necessary to install a pressure regulator.

In addition, it is also possible to opt to install a plurality of pressure conduits, wherein one or all pressure conduits are also provided with a pressure regulator which is controlled by the control mechanism.

In an embodiment according to the invention the control mechanism can be configured to generate a signal which indicates that the total quantity of liquid substance in the device is smaller than a predetermined minimum quantity on the basis of the levels measured by one or more sensors.

When substance is regularly drawn off at the draw-off points, the quantity of substance in all containers combined will eventually decrease. This can be detected with the sensors.

The control mechanism for instance registers the amount of time which passes in each case before a different state is switched to. If this amount of time is shorter than a predetermined threshold value, the above stated“empty” signal is generated. In an example of a device with only two containers, wherein the substance is continuously pumped back and forth between the two containers, switching between the two states will take place increasingly quickly as more of the substance is drawn off. If the amount of time between the switching moments is shorter than a predetermined minimum time, for instance 1-2 minutes, the“empty” signal is generated.

In a device with only one container according to the invention the level in the second container will drop as more of the substance is drawn off. The control mechanism for instance registers the height of the level in the second container at different points, wherein the“empty” signal is generated when the level in the second container drops below a determined threshold value.

A notification is for instance given to the operator of the device on the basis of the above stated signal. An alarm in the form of sound and/or light is for instance generated. In another example an SMS or email is sent to the operator.

In an embodiment according to the invention the device can comprise a water supply connected to one or more of the containers, wherein the control mechanism is configured to carry water into the containers if a signal that the water supply has to be opened has been generated.

In other words, the control mechanism can automatically carry water into one or more of the containers. The control mechanism for instance controls a controllable valve in a water supply conduit. The water supply can additionally or alternatively supply water under high pressure, for instance a pressure of more than 25 bar, more than 50 bar or even 100 bar or more. The water supply comprises for instance a connection for connecting a pressure cleaner to the water supply. The cleaning is improved further by guiding water into the containers under a high pressure.

A number of alternatives for the embodiment can be envisaged here. A water supply conduit is preferably operatively connected to the container such that cleaning of the container can take place by means of upflow flushing of the container. This means that water, preferably under a determined pressure, is fed through the container from a low, lower side to a high, upper side.

An alternative embodiment, optionally in combination with the above stated preferred alternative, comprises a water conduit which is operatively connected to the container on a high, upper side. Such a water conduit which is operatively connected to the upper side of the container is embodied to realize a downflow water flushing of the container. This means that the container is flushed in a downstream direction, preferably at regular, predetermined intervals. Such a flushing is preferably done with water, but can also be provided with cleaning agent. Such a downflow water flushing can also be advantageously employed to dilute the quantity of liquid substance if the quantity of liquid substance in the device increases. If the device detects that the quantity of liquid substance, such as mash or milk, has decreased below the predetermined minimum quantity, the control mechanism switches to a state in which water is carried into at least one of the containers.

The first time that the quantity of liquid substance drops below the minimum level a switch will for instance take place to a diluting mode in which the liquid substance still present in the device is diluted by supply of water in one or more of the containers. The control mechanism then switches back to the pumping state so that the substance diluted with water is then pumped between the containers. In the case that mash is distributed in an animal accommodation, diluted mash is thus supplied to the cattle at that moment. When it is then once again detected by the device that the quantity of substance, for instance the mash diluted with water, present in the device has decreased to a level below the minimum level, the control mechanism can switch to a state in which the containers are flushed clean by once again supplying water.

The device comprises for instance a discharge for carrying flushing water out of the device. The discharge is for instance coupled to a container or to the conduit connecting the containers, and the discharge comprises for instance a valve controllable by the control mechanism.

In a further preferred embodiment the conduit comprises a static mixer.

A static mixer, also referred to as tube mixer, is a mixer without moving parts. A static mixer comprises a tube with a number of obstacles therein which influence the flow, for instance in the form of baffles or guides. The medium flowing through the static mixer is in this way set into turbulent flow and is thereby mixed. Although the device already prevents settling of mixtures by means of the pumping, this effect is additionally enhanced using the static mixer. The static mixer is therefore particularly advantageous when the device is employed in the pumping of mixtures, such as milk or mash.

The invention further relates to an animal accommodation provided with a container or a device as described above. The same advantages and effects as described above in respect of the container and the device according to the invention apply for the animal accommodation.

It is noted that an animal accommodation can if desired be provided with two or more devices according to the invention as described above. An animal accommodation is for instance subdivided into a number of sections and/or stalls, and each section or each stall is provided with a device as described above for distributing liquid cattle feed in the relevant section/the relevant stall. In such a case the devices are preferably equipped with two containers. It is thereby relatively inexpensive and simple to place a plurality of such devices in an animal accommodation. Because a device is provided per section and/or stall, it is possible to control the feed per section/stall. The addition of medicines, such as antibiotics, to the feed can also be controlled per section/stall.

The devices can each be provided with a gas supply, for instance in the form of a relatively small compressor for each device. One or more larger compressors can alternatively be provided, each supplying compressed air to more than one device in the animal accommodation. Each device can moreover be equipped with its own control mechanism, or the control mechanisms of all the devices can be accommodated in a central module which controls the valves of the devices via a wire or wirelessly. A water supply and/or a feed supply can likewise be provided centrally or decentrally.

The invention further relates to a conversion kit for converting an existing feeding device for distributing liquid cattle feed to a device according to the invention, wherein the conversion kit comprises of:

providing one or more containers according to the invention and/or a device according to the invention;

installing at least one container according to the invention;

connecting the existing conduits to the at least one container;

connecting the pump mechanism and/or the pressure conduits and the control mechanism; and

adding one or more shut-off valves.

The same advantages and effects as described above in respect of the container, the device and the animal accommodation according to the invention apply for the conversion kit.

In addition, the invention relates to a method for distributing liquid cattle feed over a number of draw-off points in an animal accommodation using the above stated device, comprising of: providing a device according to the invention;

bringing the conduit to a constant, relatively low pressure by controlling the pressure in the first container;

keeping the conduit at the lower, constant pressure for some time with the pneumatic system in order to feed the animals, wherein the pressure decrease due to distribution of cattle feed through the draw-off points is compensated by the controlling of the pressure in the first container in order to keep the pressure in the conduit substantially constant;

switching to the pumping state with the control system and herein increasing the pressure in the first container with the pneumatic system in order to pump the liquid cattle feed from the first to the second container;

transferring liquid cattle feed from the second container to the first container in order to fill the first container.

The same advantages and effects as described above in respect of the container, the device, the animal accommodation and the conversion kit according to the invention apply for the method according to the invention.

Alternatively, it is possible to opt during the step of feeding not to compensate the pressure decrease due to the distribution of cattle feed through the draw-off points. This is preferably applied in devices wherein the pressure drop over the conduit during the feeding state is very limited, such as in devices with short conduits and/or few draw-off points.

In an embodiment of the method according to the invention the method can additionally also comprise of cleaning the device. The cleaning of the device comprises the steps of supplying water and/or cleaning agent to the device, bringing the device into a cleaning state by bringing the device to a low, preferably atmospheric pressure, and switching to the pumping state and therein increasing the pressure in the first container in order to pump the water and/or cleaning agent through the device. The cleaning of the device according to the method further comprises of alternating the cleaning state and the pumping state.

Further advantages, features and details of the invention are elucidated on the basis of preferred embodiments thereof, wherein reference is made to the accompanying drawings, in which:

Figure 1 shows schematically a device for distributing a liquid substance according to a first embodiment of the invention;

Figures 2A and 2B show schematically a device for distributing a liquid substance according to a second embodiment of the invention; Figure 3 shows schematically a device for distributing a liquid substance according to a third embodiment of the invention, wherein the device comprises two containers according to the invention;

Figure 4A shows schematically a first example of an air control for the device of Figure 3;

Figure 4B shows schematically a second example of an air control for the device of Figure 3;

Figures 5A-D show schematically different embodiments of a cattle feed container according to the invention.

In a first exemplary embodiment of cattle feed container 500 for liquid cattle feed (see figure 5A) cattle feed container 500 is provided as a tube wound in a spiral shape and extending round central axis A. The wound tube forms cattle feed container structure 502 which is provided with lower opening 504 for supply and/or discharge of liquid cattle feed respectively to and from cattle feed container 500. Wound tube 502 encloses flow channel 506 which extends downward toward opening 504 at a slight incline relative to plane H. Cattle feed container 500 is further provided with two connections 508 for connecting a pressure conduit or a pressure-generating insulation, such as a pressure pump (not shown). In the shown example the connections debouch directly into flow channel 506 of wound tube 502. Cattle feed container 500 is further provided with heating device 510, this being embodied here as a heating wire arranged around wound tube 502, and with sensors 512 which are configured to perform a level and/or temperature

measurement. Tube 502 is embodied as transparent plastic tube through which the liquid cattle feed is carried in visible manner. Alternatively, it is also possible to opt to embody the tube in metal and/or an alloy, preferably stainless steel.

A second example of cattle feed container 500 according to the invention (see figure 5B) further shows support structure 514 which serves as a base for winding tube 502 into the spiral shape. In the shown example heating device 510 is arranged in support structure 514, and several sensors (not shown) are also incorporated in support structure 514.

In a third example of cattle feed container 500 according to the invention (see figure 5C) cattle feed container structure 502 is provided as cylindrical block 502 with integrally formed flow channel 506 which extends in block 502 from upper opening 516 to lower opening 518 in the block. In the shown embodiment an additionally formed end part 520 with caps 522 is provided, wherein cap 522 is removable in order to connect an additional conduit (not shown). This realizes a cattle feed container 500 through which flow occurs, this facilitating the cleaning. Connections 508 for connection to a pressure conduit or pressure generator can be arranged in structure 502 or in end part 520. A fourth example (shown in figure 5D) shows cattle feed container structure 502 which is arranged in housing 524, wherein housing 524 is provided with heating element 510. In this example housing 524 can be filled with water, wherein filled housing 524 can be heated with heating device 510 so as to enable heating of the liquid cattle feed in structure 502.

A first example of device 2 according to the invention (figure 1) comprises first container 4 and second container 6 in the form of a supply reservoir. Supply reservoir 6 for instance has a volume of more than 100 litres, more than 250 litres, more than 500 litres, or even more than 1000 litres. Device 2 comprises conduit 12, which is connected to a lower part of first container 4 via connection 8. A number of draw-off points 13 is provided on conduit 12. Conduit 12 is eventually lead upward and debouches into supply reservoir 6 which is situated above first container 4. The underside of supply reservoir 6 is coupled via a valve 7 to the upper side of first container 4. Valve 7 is controlled by control mechanism 26.

Although only three draw-off points are shown in this example, more or fewer draw-off points can be provided as desired. In the schematic view of figure 1 the draw-off points 13 seem to be coupled to conduit 12 via a number of branches of this conduit 12. According to the invention, draw-off points 13 are however preferably directly coupled to conduit 12 so that no branch or almost no branch is present between conduit 12 and draw-off points 13.

In this example each draw-off point debouches into a trough, and the draw-off points are provided with a valve which is controlled on the basis of a sensor which registers the quantity of feed in the trough. The draw-off point can alternatively be connected to a trough with a so-called “nipple”, wherein feed is let into the trough when an animal, such as a piglet, presses against the nipple.

In device 2 the feed is pumped from container 4 through conduit 12 toward supply reservoir 6. For this purpose valve V1B is opened so that the gas pressure in container 4 is increased relative to the atmospheric gas pressure prevailing in supply reservoir 6. Valve 7 is preferably closed or kept closed during the pumping of feed from container 4.

By operating valve 7 container 4 can be filled up with feed from supply reservoir 6. In short, the feed is effectively pumped around in device 2. Container 4 is for instance equipped with a sensor 4a, 4b for measuring the level of the liquid cattle feed in container 4. On the basis of the signal measured by sensor 4a, 4b control mechanism 26 opens valve 7 for the purpose of filling up container 4. In this case the force of gravity will ensure that feed flows from supply reservoir 6 into container 4. If desired, valve VI A can be opened during the filling up of container 4 so that the pressure in container 4 is reduced.

Conduit 12 is further provided with shut-off valve 9 which is configured to be switched between an open position and a closed position. In the pumping state of device 2, i.e. when valve V1B is opened, so that the gas pressure in container 4 is increased relative to the atmospheric gas pressure prevailing in supply reservoir 6 and the feed is pumped via conduit 12 to supply reservoir 6, shut-off valve 9 is brought into and kept in open position by control system 26. During the feeding state of device 2 shut-off valve 9 is brought into and kept in closed position by the control mechanism, wherein the pressure in conduit 12 is kept substantially constant by the controlling of the pressure via valve V1B.

Supply reservoir 6 is additionally provided with a sensor 6a, 6b for measuring the feed level in supply reservoir 6, wherein the sensor is configured to generate a level signal if the feed level drops below (6a) or rises above (6b) a determined threshold level.

In a second example of device 102 (figures 2 A and 2B) supply reservoir 106 is placed adjacently of or some distance from first container 104. Conduit 1012 forms a ring conduit which is configured to pump around liquid cattle feed. Pump 1011 can be conventional pump 1011 for pumping around and for filling first container 104 (figure 2A), but can also be auxiliary pump 1011 which is configured only to fill first container 104. If pump 1011 is configured as auxiliary pump 1011, a simpler pump with a lower capacity can be employed. In the embodiment of figure 2B first container 104 functions as pneumatic pump installation.

In the example of the embodiment of figure 2 A first container 104 functions as accumulator for device 102. In the pumping state of device 102 liquid feed is pumped around through ring conduit 1012. By opening valve V101A the pressure in first container 104 is reduced and first container 104 is filled from ring conduit 1012 by pump 1011. When the rest state is switched to, shut-off valve 109 and valve V101 A are closed by the control mechanism and valve V101B is opened in order to increase the pressure in first container 104. The pressure in ring conduit 1012 is controlled by control mechanism 1026 by the controlling of the pressure in first container 104.

The device is further provided with a third conduit 1015 which, after closing of valve 1017, forms a circuit without the part of ring conduit 1012 in which the draw-off points are received. First container 104 and second container 106 can hereby be easily cleaned without cleaning whole ring conduit 1012. Use is made for this purpose of water supply conduit 1019 which can be closed by valve 1021.

In the alternative example of the embodiment of figure 2B first container 104 functions as accumulator and as pneumatic pump for device 102. In this device pump 1011 functions as auxiliary pump 1011, wherein the capacity of the auxiliary pump 1011 is configured to fill first container 104. Prior to the pumping state, pump 1011 is switched on and valve V101A is opened in order to fill first container 104. Shut-off valve 1017 can here be closed in order to expedite the filling. In the subsequent pumping state of device 102 valve V101A is closed and shut-off valve 109 is opened, and valve V101B is opened in order to increase the pressure in first container 104. The liquid feed is thereby pumped via ring conduit 1012 to supply reservoir 106. When the rest state is switched to, shaft-off valve 109 and valve V 101 A are closed by the control mechanism.

The pressure in ring conduit 1012 is controlled by control mechanism 1026 by controlling the pressure in first container 104 with valve V101C.

The device of the examples of figures 2A and 2B is further provided with third conduit 1015 which, after closing of valve 1017, forms a circuit without the part of ring conduit 1012 in which the draw-off points are received. First container 104 and second container 106 can hereby be easily cleaned without cleaning whole ring conduit 1012. Use is made for this purpose of water supply conduit 1019 which can be closed by valve 1021.

In a third example of a device 202 according to the invention (figure 3) device 202 comprises a fully pneumatic pump system and first container 204 and second container 206. First container 204 and second container 206 are each provided on a lower part with a connection 208, 2010. Connections 208, 2010 of containers 204, 206 are connected to each other via conduits 2012, so that a liquid substance, such as liquid cattle feed - particularly mash or milk - can be pumped from container 204 to container 206, and vice versa, via conduit 2012. Conduit 2012 has a number of draw-off points 2013.

Provided on an upper part of containers 204, 206 is connection 2014, 2016 which connects each of the containers 204, 206 via conduits 2018, 2020 to air control 2022. Air control 2022 is connected via pressure reducing valve 2023 to compressed air supply 204. In this example the compressed air supply comprises a compressor. A gas bottle with compressed air can alternatively be provided. The maximum gas pressure of the system can be set with the pressure reducing valve, for instance by turning a tap of the pressure reducing valve. The gas pressure is for instance set to 0.5 bar, 1.5 bar or even 3 bar or more relative to the atmospheric pressure.

Device 202 further comprises control mechanism 2026, for instance a programmable logical controller (PLC), a printed circuit board (PCB), an integrated circuit (IC) or other electronic control. Control mechanism 2026 controls air control 2022.

Arranged in each container 204, 206 in a lower part is sensor 2028, 2030 for detecting the liquid substance. The level of the liquid substance in containers 204, 206 is thereby effectively measured. This is because, when sensor 2028, 2030 detects no liquid substance, the level in relevant container 204, 206 is lower than the level to which sensor 2028, 2030 is configured.

Sensors 2028, 2030 are connected to control mechanism 2026 via a wire or wirelessly, so that this mechanism can control air control 2022 subject to the level measured by sensor 2028, 2030. In the shown example sensors 2028, 2030 are resistivity sensors, conductivity sensors or another sensor for detecting a liquid substance. Sensors 2028, 2030 can alternatively for instance be embodied as a distance sensor, for instance an infrared distance sensor, for measuring the distance between the upper side of the substance present in the container and a fixed sensor position, for instance a position in an upper part of the container. As further alternative, the sensor can be embodied as a weight sensor for measuring the weight of the substance present in the container.

In the shown example containers 204, 206 are provided on their upper side with optional closure 2032, 2034, for instance in the form of a screw cap. Closures 2032, 2034 are alternatively for instance embodied as manhole, or containers 204, 206 are even embodied as split tank, i.e. a tank comprising two tank parts which can be uncoupled from each other. Closures 2032, 2034 can be opened in order to thus manually fill containers 204, 206 with the liquid substance. When closures 2032, 2034 are closed they are gastight, so that a gas pressure can be built up in containers 204, 206. Closures 2032, 2034 comprise for instance a seal such as an O-ring for this purpose.

In a first example of air control 2022 (figure 4 A) each air conduit 2018, 2020 is connected to venting valve V201A, V202A and supply valve V201B, V202B. Supply valves V201B, V202B connect air conduits 2018, 2020 to compressor 2024 for supplying compressed air in containers 204, 206. Venting valves V201A, V202A connect air conduits 2018, 2020 to the surrounding area for venting of containers 204, 206 via air conduits 2018, 2020. Control mechanism 2026 is operatively connected to valves V201A, V201B, V202A, V202B in order to control them.

In a first pumping state the substance is pumped from container 204 to container 206. Gas pressure Pl in first container 204 is for this purpose increased relative to gas pressure P2 in second container 206. Control mechanism 2026 closes for this purpose venting valve V201A of container 204, while it opens supply valve V201B of container 204, so that gas pressure Pl in container 204 is increased with compressed air from compressor 2024. In this first state venting valve V202A of second container 206 is preferably opened, while supply valve V202B of second container 206 is closed, so that second container 206 is vented and gas pressure P2 corresponds to atmospheric pressure.

As soon as container 204 is empty, or at least almost empty, sensor 2028 will detect no more substance in container 204. Control mechanism 2026 then switches to a second pumping state, in which control mechanism 2026 controls air control 2022 to increase gas pressure P2 relative to gas pressure Pl, so that the substance is pumped back from second container 206 to first container 204. Control mechanism 2026 closes venting valve V202A and opens supply valve V202B so that gas pressure P2 in second container 206 is increased. Control mechanism 2026 preferably moreover closes supply valve V201B of first container 204 and control mechanism 2026 opens venting valve V201A, so that container 204 is vented and gas pressure Pl in first container 204 corresponds to atmospheric pressure. Some gas overpressure relative to atmospheric pressure can alternatively be maintained in container 204, as described above.

When second container 206 is empty, at least almost empty, sensor 2030 of second container 206 detects no substance. This is registered by control mechanism 2026, which switches back to the first pumping state. Continuous switching between the first and second pumping state takes place in this way in order to continuously pump the substance back and forth between containers 204, 206.

Before switching from the first pumping state to the second pumping state or vice versa, control mechanism 2026 optionally switches to a rest state in which gas pressure Pl, P2 is kept constant in both containers 204, 206. In the rest state the system automatically finds a position of equilibrium in which the pressures Pl and P2 are substantially equal.

A first option is to open both venting valves V201A, V202A in the rest state, so that the pressure in the two containers 204, 206 is equal to atmospheric pressure. It is however recommended to maintain some overpressure relative to atmospheric pressure in both containers 204, 206 in the rest state, so that the substance can also be drawn off from draw-off points 2013 in the rest state. All valves V201A, V201B, V202A, V202B are for instance closed for this purpose. One or both supply valves V201B, V202B can if desired still be opened for some time.

The gas pressure in containers 204, 206 is in the rest state for instance set to 1.1 - 2 bar, or even more than 2 bar.

A gas pressure sensor can optionally be provided in one or more of containers 204, 206, which is connected to control mechanism 2026 as feedback so that control mechanism 2026 can control valves V201A, V201B, V202A, V202B in order to set a predetermined gas pressure in relevant container 204, 206.

Because substance will regularly be drawn off at draw-off points 2013 during use, the total quantity of liquid substance in device 202 decreases. In an exemplary embodiment control mechanism 2026 tracks the time which passes between successive switching moments in order to register this decrease. This means that control mechanism 2026 registers the amount of time between switching from the first to the second pumping state and switching back again from the second to the first pumping state. If this period of time is shorter than a predetermined lower limit, for instance 1 - 2 minutes, control mechanism 2026 generates an“empty” signal which indicates that the quantity of feed is less than a predetermined lower limit. This predetermined lower limit otherwise need not be expressed in terms of volume or weight: the time between switching can function as a measure for the quantity of feed still present in the system. On the basis of the signal an alarm in the form of light and/or sound is for instance generated, or a message is sent, for instance via SMS or email. On the basis of the signal water and/or feed is for instance

automatically supplied to one or more of the containers.

The control mechanism alternatively detects that the total quantity of substance has decreased on the basis of one or more sensors. Each container comprises for instance a sensor for measuring a level of the substance in the relevant container. In the example of figure 3 the control mechanism can be configured to generate the“empty” signal when the two sensors 2028, 2030 detect no substance. In a second example of air control 2022 (figure 4B) each air conduit 2018, 2020 is connected to an electrically controlled 3/2 valve 20V3, 20V4. Air conduit 2018, 2020 is connected to a first port of respectively valve 20V3 or valve 20V4, a second port of valve 20V3, 20V4 is connected to the surrounding area for venting and a third port of valve 20V3, 20 V4 is connected to gas supply 2024. Valves 20V3, 20V4 thus connect air conduit 2018, 2020 to either gas supply 2024 or the surrounding area. Valves 20V3, 20V4 are controlled by control mechanism 2026 in a similar manner as described above in respect of figure 4A.

The present invention is by no means limited to the above described preferred embodiments thereof. The rights sought are defined by the following claims, within the scope of which many modifications can be envisaged.

Claims

1. Cattle feed container for use in a device for distributing liquid cattle feed, comprising: a cattle feed container structure provided with at least one opening for supply and/or discharge of liquid cattle feed; and

2. Cattle feed container according to claim 1 , wherein the container is provided with a heating device.

3. Cattle feed container according to any one of the foregoing claims, wherein the container is provided with one or more sensors for measuring one or more of the liquid level in the container, the composition of the liquid, the temperature of the liquid, the pressure in the container and/or the flow rate of the liquid through the container.

4. Cattle feed container according to any one of the foregoing claims, wherein the structure is a tube or hose wound in a spiral shape, wherein the spiral shape extends round a central axis.

5. Cattle feed container according to any one of the claims 1-3, wherein the structure is a block-shaped or cylindrical solid structure which is provided with an integrally formed flow channel extending along a spiral-shaped path between the opening and a second opening in the structure, wherein a cross-section of the flow channel, as seen in a direction perpendicularly of a flow direction, has a substantially circular form.

6. Device for distributing a liquid substance, such as liquid cattle feed, comprising:

a first container, comprising a cattle feed container according to any one of the claims 1-5;

a second container for containing the liquid substance; a conduit which connects an opening of the cattle feed container to the second container for transport of the liquid substance from the first container to the second container, wherein the conduit is provided with a number of draw-off points; a pump system for pumping the liquid substance between the containers; and a pneumatic system connected operatively to the first container and configured to adjust the gas pressure in the first container;

a control mechanism for controlling the pump system and/or the pneumatic system, wherein the device comprises a pumping state and a feeding state, wherein the pneumatic system is configured to control the pressure in the first container, when the device is in the feeding state, such that the pressure in the conduit is substantially constant.

7. Device according to claim 6, wherein the second container is a cattle feed container according to any one of the claims 1-5, wherein the pump system is formed by the pneumatic system and wherein the control mechanism is configured to control the pneumatic system in a pumping state to increase the gas pressure in the first container relative to the gas pressure in the second container, so that liquid substance flows from the first to the second container or vice versa.

8. Device according to any one of the claims 6-7, wherein the first container is provided with a venting valve and with a supply valve which is connected to a gas supply of the pneumatic system, wherein the control mechanism is configured to control the gas pressure in the first container by controlling the valves of the relevant container.

9. Device according to any one of the claims 6-8, further comprising a heating means for heating the substance in at least one of the containers, wherein the heating means preferably comprises at least one heated bath in which at least one of the containers is placed.

10. Device according to any one of the claims 6, 8-9, further comprising:

a second conduit which connects the second container to the first container for transport of the liquid substance from the second container to the first container, wherein the pump system is arranged in the second conduit; and

a shut-off valve which is arranged in the conduit downstream of the draw-off points and can be switched between a closing position and a position allowing passage; wherein the control mechanism is configured to keep the shut-off valve in the position allowing passage in the pumping state of the device so that liquid substance can be transported through the first and second conduit, and wherein the control system is configured to keep the shut-off valve in the closing position in the feeding state of the device and to control the pressure in the first container such that the pressure in the conduit is constant.

11. Device according to claim 10, further comprising:

a second shut-off valve which is arranged in the conduit downstream of the draw-off points and which can be switched between a closing position and a position allowing passage;

wherein the control mechanism is configured to keep the shut-off valves in the position allowing passage in the pumping state of the device so that liquid substance can be transported through the first and second conduit, and wherein the control system is configured to keep the shut-off valves in the closing position in the feeding state of the device and to control the pressure in the first container such that the pressure in the conduit is constant.

12. Device according to any one of the claims 6-11, wherein the control mechanism is configured to generate a signal which indicates that the total quantity of liquid substance in the device is smaller than a predetermined minimum quantity on the basis of the levels measured by one or more sensors.

13. Device according to any one of the claims 6-12, further comprising a water supply connected to one or more of the containers, wherein the control mechanism is configured to carry water into the containers if a signal that the water supply has to be opened has been generated.

14. Animal accommodation provided with a device according to any one of the claims 6- 13 and/or one of the containers according to any one of the claims 1-5.

15. Conversion kit for converting an existing feeding device for distributing liquid cattle feed to a device according to any one of the claims 6-13, comprising of:

providing one or more containers according to any one of the claims 1 -5 and/or a device according to any one of the claims 6-13;

installing at least one container according to any one of the claims 1-5;

connecting the existing conduits to the at least one container;

adding one or more shut-off valves.

16. Method for distributing liquid cattle feed through a feeding system comprising a number of draw-off points in an animal accommodation, comprising of:

providing a device according to any one of the claims 7-14;

closing the conduit;

- bringing the conduit to a constant, relatively low pressure;

keeping the conduit at the lower, constant pressure for some time with the pneumatic system in order to feed animals, wherein the pressure decrease due to distribution of cattle feed through the draw-off points is compensated in order to keep the pressure constant;

- opening the shut-off valve with the control system and increasing the pressure with the pneumatic system in order to pump the liquid cattle feed from the first to the second container; and

pumping the liquid cattle feed from the second container to the first container in order to fill the first container.