Control device for oscillating table

Patent metadata

Field	Value
Publication number	US-9731346-B2
Application number	US-201515117813-A
Country	US
Kind code	B2
Filing date	Feb 13, 2015
Priority date	Feb 14, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A control device ( 1 ) for an oscillating table ( 6 ), comprising: —a closed and pressurized hydraulic circuit ( 20 ), —a hydraulic actuator ( 21 ) connected to said hydraulic circuit ( 20 ) and adapted to be connected to the mobile part of the oscillating table ( 6 ) to adjust the position thereof, in which said hydraulic actuator ( 21 ) is a double-acting cylinder having a first chamber ( 21 a ) and a second chamber ( 21 b ) delimited from each other by a sliding piston ( 22 ) rigidly connected to a first rod ( 31 a ) which is rigidly restrainable to said mobile part, in which said hydraulic circuit ( 20 ) comprises at least one reversible hydraulic pump ( 9 ) directly connected to at least one of said first chamber ( 21 a ) and second chamber ( 21 b ).

First claim

The invention claimed is:

1. A control device for an oscillating table, said device being usable to adjust the oscillation of a mobile part of said oscillating table, said device comprising:
a hydraulic circuit
a hydraulic actuator connected to said hydraulic circuit and adapted to be connected to the mobile part of the oscillating table to adjust the position thereof,

wherein said hydraulic actuator is a double-acting cylinder having a first chamber and a second chamber delimited from each other by a sliding piston rigidly connected to at least one rod which is rigidly restrainable to said mobile part,
wherein said hydraulic circuit is a closed circuit and is pressurized at a pressure above the atmospheric pressure, and comprises at least one reversible hydraulic pump, which is activated by means of a motor and is directly connected to at least one of said first chamber and second chamber with one or more ducts, without interposition of servo-valves, whereby the control of the hydraulic flow is performed directly by at least one hydraulic pump.

2. The control device according to claim 1 , wherein there is provided a control circuit connected to said hydraulic circuit to control the position of said piston.

3. The control device according to claim 2 , wherein said control circuit is adapted to act in feedback.

4. The control device according to claim 3 , wherein said control circuit comprises a position transducer for detecting the position of the piston.

5. The control device according to claim 4 , wherein said control circuit comprises a control unit connected to said motor and to said position transducer.

6. The control device according to claim 1 , wherein said hydraulic circuit is completely accommodated within a containment frame.

7. The control device according to claim 1 , wherein said hydraulic circuit comprises only one reversible hydraulic pump, which is directly connected to said first chamber and second chamber, by means of a first branch and a second branch, respectively, of said hydraulic circuit.

8. The control device according to claim 7 , wherein there are provided two connecting branches, each equipped with a maximum pressure valve, between the first branch and the second branch of the hydraulic circuit.

9. The control device according to claim 7 , wherein the reversible hydraulic pump, the first branch and the second branch are connected, by means of a third branch, to a replenishing source which allows any eventual fluid leaks from the hydraulic circuit to be replenished.

10. The control device according to claim 9 , wherein a first non-return valve and a second non-return valve, oriented so as to prevent the flow towards the replenishing source, are provided, respectively, on two branchings of the third branch which are connected to the first branch and to the second branch, respectively.

11. The control device according to claim 1 , wherein said hydraulic circuit comprises two reversible hydraulic pumps, adapted to rotate in both directions but to pump in only one of the two directions; a first hydraulic pump of said two hydraulic pumps being directly connected to the first chamber by means of a first branch of the hydraulic circuit, and a second hydraulic pump being directly connected to the second chamber by means of a second branch of the hydraulic circuit.

12. The control device according to claim 11 , wherein the motor is adapted to alternatively activate the first hydraulic pump and the second hydraulic pump so as to produce the oscillation of the oscillating table at a predetermined frequency and amplitude.

13. The control device according to claim 11 , wherein the first hydraulic pump and the second hydraulic pump are connected, by means of a third branch of the hydraulic circuit, to a replenishing source which allows any eventual fluid leaks from the hydraulic circuit to be replenished.

14. The control device according to claim 13 , wherein there is provided a first connecting branch equipped with a first maximum pressure valve between the first branch and the third branch, and wherein there is provided a second connecting branch equipped with a second maximum pressure valve between the second branch and the third branch.

15. The control device according to claim 13 , wherein a first non-return valve, oriented so as to prevent the flow from the first branch to the replenishing source, is provided between the replenishing source and the first reversible pump on a connecting branch between third branch and first branch, and wherein a second non-return valve, oriented so as to prevent the flow from the second branch to the replenishing source, is provided between the replenishing source and the second reversible pump, on a further connecting branch between third branch and second branch.

16. The control device according to claim 1 , wherein there is provided a further rod connected to the piston and arranged in the second chamber.

17. An oscillating table comprising a mobile part that can oscillate along a casting direction, and a control device, according to claim 1 , for said mobile part.

Assignees

• Danieli Off Mecc

Inventors

• De Luca Andrea
• Del Tedesco Stefano

Classifications

• B22D11/053 Primary

  Means for oscillating the moulds · CPC title

• B22D11/166 Primary

  for mould oscillation · CPC title