Fluid delivery device, injection device, ground milling machine, and method

Patent metadata

Field	Value
Publication number	US-9422676-B2
Application number	US-201514919155-A
Country	US
Kind code	B2
Filing date	Oct 21, 2015
Priority date	Oct 21, 2014
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A fluid delivery device for an injection device for introducing a fluid into a work chamber of a ground milling machine, comprising a fluid supply chamber having at least one outlet opening, the outlet opening being closable by a linearly displaceable tappet. The tappet includes an opening region in which it has a smaller cross-sectional area than the minimum cross-sectional area of the outlet opening, and a tappet head for the closure of the outlet opening, the tappet head having a cross-sectional area that includes the cross-sectional area of the outlet opening. Further, the fluid delivery device comprises a displacement device for moving the tappet between a closed position, in which the outlet opening is closed by the tappet, and an open position, in which the outlet opening is open for delivering fluid outward out of the fluid supply chamber. The tappet is configured such that the tappet head closes the outlet opening from the outside in the closed position, and that the opening region is at least partially arranged in the outlet opening and the tappet head at least partially opens the outlet opening in the open position.

First claim

What is claimed is:

1. A fluid delivery device for an injection device for introducing a fluid into a work chamber of a ground milling machine, comprising:
a fluid supply chamber including at least one outlet opening which is closable by a displaceable tappet,
a displacement device configured to move the tappet between a closing position, in which the outlet opening is closed by the tappet, and an open position, in which the outlet opening is at least partially opened for delivering fluid outward out of the fluid supply chamber,
wherein the tappet comprises a tappet shaft having an opening region and a tappet head closing the outlet opening, the opening region having a cross-sectional area that is smaller than a minimum cross-sectional area of the outlet opening, and the tappet head having a cross-sectional area that is greater than the minimum cross-sectional area of the outlet opening, and
that the tappet, when being displaced in the opening direction from the closed position into the open position, is moved such that the tappet head is pushed outward at least partially away from the outlet opening, and
that the tappet, when being displaced in the closing direction from the open position into the closed position, is moved such that it is retracted toward the outlet opening until the tappet head closes the outlet opening to the outside.

2. The fluid delivery device according to claim 1 ,
wherein the outlet opening comprises an outer closure portion which is widened compared to the outlet opening in an outwardly widening, funnel-like manner.

3. The fluid delivery device according to claim 1 ,
wherein the tappet head is at least partially configured as complementary to the closure portion of the outlet opening and that in the closed position the tappet head rests at least partially in a form fitting manner against the closure portion.

4. The fluid delivery device according to claim 3 ,
wherein the outlet opening in the closure portion is configured in the shape of a hollow truncated cone and, in a complementary manner, the tappet head is configured in the shape of a truncated cone.

5. The fluid delivery device according to claim 3 ,
wherein the tappet head is configured in the shape of a truncated pyramid, a truncated ellipsoid, a truncated sphere, a truncated paraboloid, or a truncated hyperboloid.

6. The fluid delivery device according to claim 1 ,
wherein the tappet is spring-loaded in the closing direction (S).

7. The fluid delivery device according to claim 1 ,
wherein the displacement device is driven hydraulically, pneumatically or electrically.

8. The fluid delivery device according to claim 1 ,
wherein the displacement device comprises a piston-cylinder unit, the tappet being part of a piston of the piston-cylinder unit.

9. The fluid delivery device according to claim 1 ,
wherein the displacement device comprises a stop element preventing the displacement of the tappet from the closed position in the opening direction (O) beyond a stop position.

10. The fluid delivery device according to claim 9 ,
wherein the stop position of the tappet is the position in which the outlet opening is maximally opened.

11. The fluid delivery device according to claim 1 ,
wherein a tappet protection device having a guide surface for deflecting milled-off material is arranged on the outer side of the fluid delivery device next to the outlet opening, the guide surface being arranged such that it deflects milled material moved transversely to the closing direction at least partially in a direction that leads away from the tappet.

12. An injection device, comprising:
at least two fluid delivery devices according to claim 1 ,
a line system for supplying fluid to the at least two fluid delivery devices, and
a control unit which is configured for the control of the displacement devices of the at least two fluid delivery devices.

13. A ground milling machine having an injection device according to claim 12 .

14. A ground milling machine according to claim 13 ,
wherein the ground milling machine comprises a recycler, a stabilizer or cold milling machine.

15. A method for controlling the opening state of a fluid delivery device according to claim 1 , comprising:
a) moving the tappet from a closed position (P 1 ) into an open position (P 2 ) by the steps of:
applying a force to the tappet in an opening direction (O);
moving the tappet outward and away from the outlet opening;
moving the tappet head into an open position outside a fluid supply chamber; and
opening the outlet opening;

b) closing the tappet from the open position (P 2 ) into a closed position by the steps of:
applying a force to the tappet in the closing direction (S);
moving the tappet inward and toward the outlet opening; thus
moving the tappet head into a closed position;
establishing contact between the tappet head and an outer wall of the fluid supply chamber via sealing surfaces; and
sealing the outlet opening.

16. The method according to claim 15 ,
the opening comprising the steps of:
pumping fluid into the fluid supply chamber until the pressure exceeds a lower pressure threshold value; and
applying a force to the tappet in the opening direction (O) via the internal pressure of the fluid supply chamber;

the closing comprising the steps of:
reducing the pressure in the fluid supply chamber ( 310 ) below a lower pressure threshold value; and
applying a force to the tappet in the closing direction (S) via a restoring spring.

17. The method according to claim 15 ,
the opening comprising the steps of:
transferring a control signal to the displacement device ( 340 ); and
applying a force to the tappet in the opening direction (O) via the displacement device;

the closing comprising the steps of:
transferring a control signal to the displacement device; and
applying a force to the tappet in the closing direction (S) via the displacement device.

Assignees

• Bomag Gmbh

Inventors

• Huhn Alexander

Classifications

• E01C23/127

  rotary, e.g. rotary hammers · CPC title

• F16K1/12 Primary

  with streamlined valve member around which the fluid flows when the valve is opened · CPC title

• F16K31/122

  the fluid acting on a piston (F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence) · CPC title

• E01C23/088

  Rotary tools, e.g. milling drums {(for forming recesses to receive marking materials E01C23/0946)} · CPC title

• E01C23/065 Primary

  Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving (in situ mixing of hydraulic cement concrete E01C19/025; apparatus for in-plant recycling E01C19/1004, E01C19/1036) · CPC title