ELECTRICALLY OPERATED PRESSURE CONTROL VALVE

• US 20190283072A1
• Filed: 03/14/2019
• Published: 09/19/2019
• Est. Priority Date: 03/16/2018
• Status: Active Grant

• Current Assignee: Nordson Corporation
• Original Assignee: Nordson Corporation
• Inventors: Woodlief, Robert J., Estelle, Peter W.
• Granted Patent: US 10,639,669 B2
• Time in Patent Office: Days
• CPC Class Codes: B05C 11/1013 responsive to flow or pressure of liquid or other fluent material B05C11/101 takes precedence; control of flow in general G05D7/00; control of fluid pressure in general G05D16/00
• CPC Class Codes: B05C 11/1026 Valves in general F16K; B05C5/0225 takes precedence
• CPC Class Codes: B05C 11/1042 provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
• CPC Class Codes: B05C 5/001 incorporating means for heating or cooling the liquid or other fluent material B05C11/1042 takes precedence
• CPC Class Codes: B05C 5/0225 characterised by flow controlling means, e.g. valves, located proximate the outlet B05C5/0258, B05C5/0275 take precedence; supply valves upstream the coating head B05C11/1036
• CPC Class Codes: B29B 13/022 Melting the material to be shaped

Abstract

A hot melt dispensing system is described. The hot melt dispensing system includes a melter that melts solid material into hot melt, a pump that pumps the hot melt from the melter to at least one applicator, and a pressure control system that controls a pressure of pressurized air for operating the pump. The pressure control system includes a regulator assembly that controls the pressure of the pressurized air, and a drive component that actuates the regulator assembly. The hot melt dispensing system also includes a controller that determines a pressure setting for the pressurized air. The drive component receives the pressure setting from the controller and actuates the regulator assembly to a position associated with the pressure setting.

Claims

1. A hot melt dispensing system, comprising:

a melter configured to melt solid material into hot melt;

a pump configured to pump the hot melt from the melter to at least one applicator;

a pressure control system configured to control a pressure of pressurized air for operating the pump, the pressure control system comprising;

a regulator assembly configured to control the pressure of the pressurized air; and

a drive component configured to actuate the regulator assembly; and

a controller configured to determine a pressure setting for the pressurized air,

wherein the drive component is configured to receive the pressure setting from the controller and actuate the regulator assembly to a position associated with the pressure setting.

2. The hot melt dispensing system of claim 1, further comprising:

a pressure sensor configured to collect pressure data on the pressurized air and provide the pressure data to the controller,

wherein the controller is configured to calculate the pressure setting based on the pressure data.

3. The hot melt dispensing system of claim 2, wherein the pressure sensor is in communication with the pressurized air between the pressure control system and the pump.

4. The hot melt dispensing system of claim 1, wherein the pressure control system further comprises a circuit board, wherein the controller is implemented on the circuit board.

5. The hot melt dispensing system of claim 1, wherein the drive component is a stepper motor.

6. The hot melt dispensing system of claim 1, wherein the drive component is configured to rotate a component of the regulator assembly.

7. The hot melt dispensing system of claim 1, wherein the pressure data is a function of an earlier pressure setting of the pressure control system.

8. The hot melt dispensing system of claim 1, wherein the at least one applicator comprises a plurality of applicators.

9. A hot melt dispensing system, comprising:

a melter configured to melt solid material into hot melt;

at least one applicator configured to dispense the hot melt onto to a substrate;

a pump configured to pump the hot melt from the melter to the at least one applicator; and

a pressure control system configured to control a pressure of the hot melt pumped by the pump, the pressure control system comprising;

a regulator assembly configured to control the pressure of the hot melt; and

a drive component configured to actuate the regulator assembly; and

a controller configured to determine a pressure setting for the hot melt,

wherein drive component is configured to receive the pressure setting from the controller and actuate the regulator assembly to a position associated with the pressure setting.

10. The hot melt dispensing system of claim 9, further comprising:

a pressure sensor configured to collect pressure data on the hot melt and provide the pressure data to the controller,

wherein the controller is configured to calculate the pressure setting based on the pressure data.

11. The hot melt dispensing system of claim 9, wherein the pump is configured to pump the hot melt to the at least one applicator through the pressure control system.

12. The hot melt dispensing system of claim 11, further comprising:

a flow divider configured to receive the hot melt from the pump and split the hot melt between an applicator path that extends to the at least one applicator and a recirculation path that includes the pressure control system and recirculates the hot melt to the pump.

13. The hot melt dispensing system of claim 9, wherein the drive component is configured to rotate a component of the regulator assembly.

14. The hot melt dispensing system of claim 13, wherein the drive component is a stepper motor.

15. The hot melt dispensing system of claim 13, wherein the regulator assembly comprises:

a needle;

a spring configured to exert a downward force on the needle;

a piston configured to bias the spring; and

a seat, wherein the needle is configured to move upwards against the downward force of the spring under an upwards force applied by the hot melt as the hot melt flows between the needle and the seat,

wherein the position associated with the pressure setting is a vertical position of the piston, such that the piston applies a load having a predetermined magnitude onto the spring.

16. The hot melt dispensing system of claim 13, wherein the regulator assembly comprises:

an input;

an output;

a spring assembly;

a nut plate configured to selectively bias the spring assembly so as to adjust a pressure setpoint of the spring assembly;

a sensor assembly operably attached to the spring assembly;

a valve assembly operably attached to the sensor assembly and configured to control a pressure drop of the hot melt flowing from the input to the output,

wherein the valve assembly is configured to further open when the pressure of the hot melt at the output decreases below the pressure setpoint of the spring assembly so as to move the sensor assembly in a first direction, and the valve assembly is configured to further close when the pressure of the hot melt at the output increases above the pressure setpoint of the spring assembly so as to move the sensor assembly in a second direction opposite the first direction.

17. A method of dispensing a hot melt, the method comprising:

melting solid material into the hot melt;

pumping the hot melt to at least one applicator via a pump, wherein the pump is operated via pressurized air;

determining a pressure setting for the pressurized air; and

automatically actuating a regulator assembly of a pressure control system to a position associated with the pressure setting, wherein the pressure control system is configured to control a pressure of the pressurized air.

18. The method of claim 17, further comprising:

measuring the pressure of the pressurized air via a pressure sensor,

wherein determining the pressure setting is performed based on the pressure measured by the pressure sensor.

19. A method of dispensing a hot melt, comprising:

melting solid material into the hot melt;

pumping the hot melt to at least one applicator via a pump;

determining a pressure setting for the hot melt; and

automatically actuating a regulator assembly of a pressure control system to a position associated with the pressure setting, wherein the pressure control system is configured to control a pressure of the hot melt pumped by the pump.

20. The method of claim 19, further comprising:

measuring the pressure of the hot melt via a pressure sensor,

wherein determining the pressure setting is performed based on the pressure measured by the pressure sensor.