Blow-molding machine with pressure cylinder with force equalization means for piston compressor

Patent metadata

Field	Value
Publication number	US-9314957-B2
Application number	US-201214129141-A
Country	US
Kind code	B2
Filing date	Jul 2, 2012
Priority date	Jul 5, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Blow-molding machine for blow-molding plastic containers with at least one blow-molding unit for stretch blow-molding preforms by means of compressed air, wherein the blow-molding unit has a force equalization means, such that at least part of the compression force which occurs is compensated for, wherein the blow-molding unit comprises a pressure piston and pressure cylinder.

First claim

What is claimed is:

1. A method for blow-molding containers, comprising:
docking a preform to a blow-molding unit, which comprises a pressure piston and a pressure cylinder;
stretch blow-molding the preform to form a finished container by means of compressed air;
undocking the finished container;
compensating at least part of the compression force by a force equalization means;
wherein the force equalization means comprises one of a passive actuator, an active actuator, and a combination thereof;
wherein the passive actuator comprises one of a spring, a pneumatic cylinder, a hydraulic cylinder, and a combination thereof;
wherein the active actuator comprises one of an electromechanical cylinder, a linear motor, a hydraulic cylinder, pneumatic cylinder, and a combination thereof;
wherein the active actuator is adapted to be combined with a threaded spindle or a recirculating ball screw; and
wherein the force equalization means comprises a scissor-type foldable joint.

2. A blow-molding machine for blow-molding plastic containers, the blow-molding machine comprising: at least one blow-molding unit for stretch blow-molding preforms by means of compressed air, the blow-molding unit having a force equalization means, such that at least part of the compression force arising is compensated; a pressure piston and a pressure cylinder; and wherein the force equalization means comprises a fluid pressure accumulator; wherein the fluid pressure accumulator comprises a second pressure piston in a second pressure cylinder, wherein the second pressure cylinder is filled at least partially with a fluid; and wherein the second pressure cylinder is configured as a water hydraulic system, wherein water is substantially used as hydraulic liquid.

3. The blow-molding machine according to claim 2 , wherein a compression force is provided for the force equalization means through the fluid.

4. The blow-molding machine according to claim 2 , wherein the second pressure piston is acted upon by pressure from a gas beam.

5. The blow-molding machine according to claim 4 , wherein the gas beam comprises nitrogen.

6. The blow-molding machine according to claim 2 , wherein the fluid is a hydraulic liquid or compressed air.

7. The blow-molding machine according to claim 2 , wherein the pressure cylinder in an expanded state is acted upon by pressure.

8. The blow-molding machine according to claim 2 , and comprising a second blow-molding unit which is connected to the pressure equalization means, wherein at least part of the compression force arising is alternatingly used in the first and in the second blow-molding unit.

9. A blow-molding machine for blow-molding plastic containers, the blow-molding machine comprising: at least one blow-molding unit for stretch blow-molding preforms by means of compressed air, the blow-molding unit having a force equalization means, such that at least part of the compression force arising is compensated; a pressure piston and a pressure cylinder; wherein the force equalization means comprises a fluid pressure accumulator and a wheel; and wherein a connecting rod which absorbs the force of the pressure piston is attached to the wheel.

10. The blow-molding machine according to claim 9 , wherein the wheel is connected to the fluid pressure accumulator.

11. The blow-molding machine according to claim 9 , wherein the wheel is a flywheel.

12. A blow-molding machine for blow-molding plastic containers, the blow-molding machine comprising: at least one blow-molding unit for stretch blow-molding preforms by means of compressed air, the blow-molding unit having a force equalization means, such that at least part of the compression force arising is compensated; a pressure piston and a pressure cylinder; wherein the force equalization means comprises one of a passive actuator, an active actuator, and a combination thereof; wherein the passive actuator comprises one of a spring, a pneumatic cylinder, a hydraulic cylinder, and a combination thereof; wherein the active actuator comprises one of an electromechanical cylinder, a linear motor, a hydraulic cylinder, a pneumatic cylinder, and a combination thereof; wherein the active actuator is adapted to be combined with one of a threaded spindle or a recirculating ball screw; and wherein the force equalization means comprises a toggle lever mechanism.

13. The blow-molding machine according to claim 12 , wherein the force equalization means further comprises a scissor-type foldable joint.

14. A blow-molding machine for blow-molding plastic containers, the blow-molding machine comprising: at least one blow-molding unit for stretch blow-molding preforms by means of compressed air, the blow-molding unit having a force equalization means, such that at least part of the compression force arising is compensated; a pressure piston and a pressure cylinder; wherein the force equalization means comprises one of a passive actuator, an active actuator, and a combination thereof; wherein the passive actuator comprises one of a spring, a pneumatic cylinder, a hydraulic cylinder, and a combination thereof; wherein the active actuator comprises one of an electromechanical cylinder, a linear motor, a hydraulic cylinder, a pneumatic cylinder, and a combination thereof; wherein the active actuator is adapted to be combined with one of a threaded spindle or a recirculating ball screw; and wherein the force equalization means further comprises a scissor-type foldable joint.

15. A method for blow-molding containers, the method comprising:
docking a preform to a blow-molding unit, which comprises a pressure piston and a pressure cylinder;
stretch blow-molding the preform to form a finished container by means of compressed air;
undocking the finished container;
compensating at least part of the compression force by a force equalization means; and wherein the force equalization means comprises a fluid pressure accumulator; and
wherein the second pressure cylinder is configured as a water hydraulic system, wherein water is substantially used as the hydraulic liquid.

16. The method according to claim 15 , wherein the fluid pressure accumulator comprises a second pressure piston in a second pressure cylinder, wherein the second pressure cylinder is at least partially filled with a fluid.

17. The method according to claim 16 , wherein a compression force is provided for the force equalization means via the fluid.

18. The method according to claim 16 , wherein the second pressure piston is acted upon by pressure from a gas beam.

19. The method according to claim 16 , wherein the gas beam is nitrogen.

20. The method according to claim 16 , wherein the fluid is a hydraulic fluid or compressed air.

21. The method according to claim 15 , further comprising applying pressure to the pressure cylinder in an expanded state.

22. The method according to claim 15 , wherein a first blow molding unit and a second blow-molding unit are connected to the force equalization means, each of the first and second blow-molding unit having a force equalization means, such that at least part of the compression force arising is compensated, and a pressure piston and a pressure cylinder, wherein the force equalization means comprises one of a passive actuator, an active actuator, and a combination thereof, wherein the passive actuator comprises one of a spring, a pneumatic cylinder, a hydraulic cylinder, and a combination thereof, and wherein the active actuator comprises an electromechanical cylinder,

Assignees

• Hirdina Jochen
• Bielmeier Heinrich
• Senn Konrad
• Winkler Günter
• Krones Ag

Inventors

• Hirdina Jochen
• Bielmeier Heinrich
• Senn Konrad
• Winkler Günter

Classifications

• B29C49/12

  Stretching rods · CPC title

• B29C49/4236

  Drive means · CPC title

• Y02P70/267

  Cross-Sectional Technologies · mapped topic

• B29C49/783

  blowing pressure · CPC title

• B29C49/4284

  Means for recycling or reusing auxiliaries or materials, e.g. blowing fluids or energy · CPC title