Milking cluster for milking an animal
There is provided a milking cluster ( 102 ) for milking an animal, the milking cluster comprising a plurality of teat cups ( 1 ) connected to a clawpiece ( 106 ). The clawpiece comprises a plurality of milk inlets that are connected to the plurality of teat cups via respective short milk tubes ( 11 ). A milk flow passageway begins at the barrel of the teat cup and ends at the clawbowl of the clawpiece, and a valve system is present within each milk flow passageway. The valve system comprises a first pressure-actuated valve through which milk flowing along the milk flow passageway must pass.
1. A milking cluster for milking an animal, the milking cluster comprising:
a plurality of teat cups connected to a clawpiece, each teat cup comprising a head, a discharge passageway for discharge of milk from the teat cup, and a barrel portion between the head and the discharge passageway, the head and barrel portion for receiving a teat of an animal to be milked,
wherein:
the clawpiece comprises a plurality of milk inlets that are connected to the plurality of teat cups via respective milk tubes,
the plurality of milk inlets discharge into a clawbowl of the clawpiece, wherein each discharge passageway, milk tube, and corresponding milk inlet collectively form a milk flow passageway beginning at the barrel portion of the teat cup and ending at the clawbowl,
a valve system is present within each milk flow passageway, each valve system comprises a first pressure-actuated valve which is configured to:
open in response to a first pressure difference greater than a first threshold across the first pressure-actuated valve in a first direction along the milk flow passageway, to allow milk to flow through the first pressure-actuated valve and along the milk flow passageway in the first direction, and
open in response to a second pressure difference greater than a second threshold pressure difference being applied across the first pressure-actuated valve in a second direction along the milk flow passageway, to allow flushing fluid to flow through the first pressure-actuated valve and along the milk flow passageway in the second direction, the second direction being opposite the first direction.
2. The milking cluster of claim 1 , wherein each teat cup further comprises a nozzle for injection of treatment fluid into the teat cup.
3. The milking cluster of claim 2 , wherein:
the nozzle of each teat cup is located in the head of the teat cup, and
the nozzle is configured to inject the treatment fluid in a direction into the barrel portion of the teat cup and towards the discharge passageway.
4. The milking cluster of claim 1 , wherein:
each teat cup comprises a pulsation cavity between a shell of the teat cup and a liner of the teat cup, the liner forming the head, the barrel portion, and the discharge passageway of the teat cup,
the first pressure-actuated valve is rated to open during a milking phase in which a first pressure is applied to the pulsation cavity to expand the liner and allow the milk to flow from the teat of the animal, and
the first pressure-actuated valve is rated to close during a rest phase in which a second pressure higher than the first pressure is applied to the pulsation cavity to collapse the liner against the teat of the animal.
5. The milking cluster of claim 1 , wherein the first pressure-actuated valve is a cross-slit valve.
6. The milking cluster of claim 1 , wherein the first pressure threshold is at least 1 KPa.
7. The milking cluster of claim 1 , wherein each milk flow passageway further comprises an air inlet upstream of the milk flow from the first pressure-actuated valve.
8. The milking cluster of claim 1 , wherein the first pressure-actuated valve requires a higher pressure differential to initially open it than a pressure differential required to maintain it open.
9. The milking cluster of claim 1 , further comprising a fluid distributor mounted on the clawpiece.
10. The milking cluster of claim 2 , further comprising a fluid distributor mounted on the clawpiece, wherein the fluid distributor comprises outlets that are connected to the nozzles of the teat cups via fluid tubes, for supplying treatment fluid to the teat cups.
11. The milking cluster of claim 1 , wherein each valve system is located:
inside the corresponding milk inlet of the clawpiece,
inside the corresponding milk tube, or
inside the corresponding discharge passageway of the corresponding teat cup.
12. Milking equipment comprising:
the milking cluster of claim 1 ; and
stall control equipment configured to send treatment fluid to the nozzles of the teat cups to treat the teats of the animal once a milking cycle has been completed, and subsequently send the flushing fluid to the flush inlets once the treating of the teats of the animal with the treatment fluid has been completed.
13. The milking equipment of claim 12 , wherein:
the stall control equipment comprises a milk flow meter that is connected to the clawbowl via a further milk tube, and
the milk flow meter is configured to shut off a vacuum to the further milk tube when a flow of milk falls below a threshold value.
14. A method of milking an animal using the milking cluster of claim 1 , the method comprising applying the teat cups to teats of an animal and milking the animal during a milking cycle, the milking cycle comprising alternating between milking and rest phases for each teat cup, wherein the first pressure-actuated valve of each teat cup opens during the milking phase of the teat cup, and closes during the rest phase of the teat cup.
15. The milking cluster of claim 1 , wherein the first threshold is at least 2 KPa.
16. A milking cluster for milking an animal, the milking cluster comprising:
a plurality of teat cups connected to a clawpiece, each teat cup comprising a head, a discharge passageway for discharge of milk from the teat cup, and a barrel portion between the head and the discharge passageway, the head and barrel portion for receiving a teat of an animal to be milked, wherein the clawpiece comprises a plurality of milk inlets that are connected to the plurality of teat cups via respective milk tubes,
wherein:
the plurality of milk inlets discharge into a clawbowl of the clawpiece,
each discharge passageway, milk tube, and corresponding milk inlet collectively form a milk flow passageway beginning at the barrel portion of the teat cup and ending at the clawbowl,
a valve system is present within each milk flow passageway, each valve system comprising a first pressure-actuated valve which is configured to open in response to a pressure difference greater than a first threshold being applied across the first pressure-actuated valve in a first direction along the milk flow passageway, to allow milk to flow through the first pressure-actuated valve and along the milk flow passageway in the first direction,
each valve system further comprises a second pressure-actuated valve connected in series with the first pressure-actuated valve,
the second pressure-actuated valve is configured to open in response to a pressure difference greater than a second threshold being applied across the second pressure-actuated valve in the first direction along the milk flow passageway, to allow the milk to flow through the second pressure-actuated valve and along the milk flow passageway in the first direction, and
the first pressure-actuated valve is rated to open at a lower pressure differential than the second-pressure actuated valve, the second pressure actuated valve being downstream of the milk flow from the first pressure-actuated valve.
17. The milking cluster of claim 16 , wherein each valve system further comprises both a flush inlet and a flush outlet to the milk flow passageway, the flush inlet and flush outlet located intermediate of the first and second pressure-actuated valves of the valve system, the flush inlet and flush outlet for flushing a portion of the milk flow passageway that is between the first and second pressure-actuated valves.
18. The milking cluster of claim 17 , wherein:
each flush outlet comprises a non-return valve that prevents ingress of fluid or dirt into the corresponding milk flow passageway via the flush outlet, and
the non-return valve of the flush outlet is optionally either a duck bill valve or an umbrella valve.
19. The milking cluster of claim 16 , wherein:
each teat cup comprises a pulsation cavity between a shell of the teat cup and a liner of the teat cup, the liner forming the head, the barrel portion, and the discharge passageway of the teat cup,
the first pressure-actuated valve is rated to open during a milking phase in which a first pressure is applied to the pulsation cavity to expand the liner and allow the milk to flow from the teat of the animal,
the first pressure-actuated valve is rated to close during a rest phase in which a second pressure higher than the first pressure is applied to the pulsation cavity to collapse the liner against the teat of the animal, and
the second pressure-actuated valve is rated to open during the milking phase and close during the rest phase.
20. The milking cluster of claim 17 , further comprising a fluid distributor mounted on the clawpiece, wherein the fluid distributor comprises outlets that are connected to the flush inlets via flush tubes, for supplying flushing fluid to the flush inlets once a milking cycle has completed.
21. A method of milking an animal using the milking cluster of claim 16 , the method comprising applying the teat cups to teats of an animal, milking the animal during a milking cycle, injecting treatment fluid into the teat cups to treat the teats of the animal once the milking cycle has been completed, and injecting flushing fluid into the flush inlets to flush the portion of the milk flow passageway between the first and second pressure-actuated valves once the treating of the teats of the animal with the treatment fluid has been completed.