WO2016008151A1 - Cylindre de moulage par soufflage avec étirage et procédé associé - Google Patents

Cylindre de moulage par soufflage avec étirage et procédé associé Download PDF

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Publication number
WO2016008151A1
WO2016008151A1 PCT/CN2014/082485 CN2014082485W WO2016008151A1 WO 2016008151 A1 WO2016008151 A1 WO 2016008151A1 CN 2014082485 W CN2014082485 W CN 2014082485W WO 2016008151 A1 WO2016008151 A1 WO 2016008151A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
end cover
stretch
barrel
stretch cylinder
Prior art date
Application number
PCT/CN2014/082485
Other languages
English (en)
Inventor
Xiaolin DENG
Jiqiang CHEN
Original Assignee
Norgren, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Norgren, Inc. filed Critical Norgren, Inc.
Priority to PCT/CN2014/082485 priority Critical patent/WO2016008151A1/fr
Publication of WO2016008151A1 publication Critical patent/WO2016008151A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4289—Valve constructions or configurations, e.g. arranged to reduce blowing fluid consumption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/122—Drive means therefor
    • B29C49/1222—Pneumatic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/122—Drive means therefor
    • B29C49/1224—Hydraulic

Definitions

  • the embodiments described below relate to power cylinders, and more particularly, to an improved stretch blow molding cylinder having internally integrated valves and fluid lines and related method.
  • Blow molding is a process for molding a preform part into a desired end product.
  • the preform is in the general shape of a tube with an opening at one end for the introduction of pressurized gas, typically air; however, other gases may be used.
  • pressurized gas typically air
  • other gases may be used.
  • One specific type of blow molding is stretch blow molding (SBM).
  • SBM stretch blow molding
  • a valve block provides both low and high-pressure gas to expand the preform into a mold cavity.
  • the mold cavity comprises the outer shape of the desired product.
  • SBM can be used in a wide variety of applications; however, one of the most widely used applications is in the production of Polyethylene terephthalate (PET) products, such as drinking bottles.
  • PET Polyethylene terephthalate
  • the SBM process uses a low-pressure fluid supply along with a stretch rod that is inserted into the preform to stretch the preform in a longitudinal direction and radially outward, and then uses a high-pressure fluid supply to expand the preform into the mold cavity.
  • the low-pressure fluid supply, along with the stretch rod, is typically employedfor a pre-blowing phase of the molding cycle.
  • the high-pressure fluid supply that expands the preform into the mold cavity is typically referred to as the blowing phase of the molding cycle.
  • the low-pressure and high- pressure fluid supplies can be controlled using blow-mold valves.
  • the resulting product is generally hollow with an exterior shape conforming to the shape of the mold cavity.
  • the gas in the preform is then exhausted through one or more exhaust valves. This process is repeated during each blow molding cycle.
  • FIG. 1 shows an example of a prior art stretch cylinder 100.
  • the stretch cylinderlOO can include a barrel 101, a stretch rod 102, a stretch rod control valve 103, and a blow-mold valve 104.
  • the stretch rod control valve 103 and the blow-mold valve 104 are shown as being coupled to the barrel 101, but in other examples, the valves 103, 104 are commonly separated from the barrel 101.
  • the barrel 101 is typically adapted to form a substantially fluid-tight seal with a mold cavity 105.
  • the barrel lOl may also be adapted to form a substantially fluid-tight seal with the preform 1 1 1, which is positioned partially in the mold cavity 105 and in fluid communication with the blow-mold valve 104.
  • a portion of the preform 1 1 1 is illustrated outside of the mold cavity 105, and coupled to the barrel 101.
  • the barrel 101 is coupled to the mold cavity 105 and the entire preform 1 1 1 is positioned within the mold cavity 105.
  • the mold cavity 105 may be provided as a separate component provided by an end user, for example, and may not form part of the stretch cylinder 100. Therefore, the stretch cylinder 100 may be adapted to couple numerous different types of mold cavities 105 and performs 1 1 1.
  • the stretch rod control valve 103 may, in some examples,comprise a proportional valve, and the blow- mold valve 104may also comprises a proportional valve.
  • Proportional valves are generally known in the art and can operate to open a port of the valve at virtually any point between a fully open and fully closed position. Therefore, rather than simple on/off operation as in traditional valves, proportional valves are capable of maintaining an actuation state between fully on and fully off. Because of the simple on/off operation of traditional valves, many prior art blow molding systems utilize two or more pressurized fluid sources and associated on/off blow-mold valves.
  • Proportional stretch cylinders can operate with a single blow-mold valve 104 and a single pressurized gas source to pressurize the preform 1 1 1 and mold cavity 105. This is because a valve port in a proportional valve may be partially opened, for example. This is advantageous in situations where the valve is provided with a high input pressure and the desired output pressure is a pressure less than the input pressure. In such situations, the proportional valve can be partially opened, thereby restricting the fluid flow through the proportional valve.
  • An example of a proportional valve is provided in PCT Publication WO/2009/018843, which is assigned to the present applicant, and provides a proportional spool valve, its contents being incorporated by reference herein, in its entirety.
  • a stretch cylinder 100 will typically undergo thousands or even millions of cycles in the course of the device's useful lifetime. Such a large scale of cycles renders the response time and speed of a cylinder's action important. Even differences in speed measured in secondssignificantly add up over time.
  • the embodiments described below overcome these and other problems and an advance in the art is achieved.
  • the embodiments described below provide a stretch cylinderwith an airline integrated into the barrel.
  • the embodiments described below also provide a cylinder having a control valve, quick exhaust valve, and check valve integrated into the cylinder end covers. The result is a stretch cylinder that exhibits an improved response time and improved speed while simplifying construction and lowering construction cost. Maintenance and related maintenance costs are also reduced.
  • a stretch cylinder with a barrel, a stretch rod actuatable from the barrel, a front end cover, and a rear end cover attached to opposing ends of the barrel is provided according to an embodiment.
  • the stretch cylinder comprises: an internal fluid conduit within the barrel, wherein the internal fluid conduit fluidly connects the front end cover to the rear end cover; and at least one valve having a body defined by the front end cover.
  • a method of manufacturing a stretch cylinder comprises the steps of: providing a barrel and an actuatable stretch rod that extends and retracts from the barrel; providing an internal fluid conduit with the barrel; attaching a front end cover and a rear end cover to opposing ends of the barrel, wherein the front end cover comprises at least one valve having a body defined by the front end cover; and fluidly connecting the front end cover to the rear end cover via the conduit.
  • a method of using a stretch cylinder comprises the steps of: supplying a fluid supply to a front end cover, wherein the front end cover is attached to a barrel having an internal fluid conduit and an actuatable stretch rod that extends and retracts from the barrel; actuating a valve having a body defined by the front end cover to allow a fluid from the fluid supply to enter the barrel, wherein the front end cover is in fluid communication with a rear end cover via the internal fluid conduit; and exhausting the fluid from the fluid supply from a port defined by at least one of the front end cover and the rear end cover.
  • a stretch rod actuatable from the barrel, a front end cover, and a rear end cover attached to opposing ends of the barrel comprises:
  • an internal fluid conduit within the barrel wherein the internal fluid conduit fluidly connects the front end cover to the rear end cover; and at least one valve having a body defined by the front end cover.
  • the stretch cylinder comprises at least one second valve having a body defined by the rear end cover.
  • the internal fluid conduit comprises a conduit integrally formed with the barrel.
  • the internal fluid conduit comprises a conduit formed by an extrusion of the barrel.
  • the at least one valve comprises a stretch rod control valve.
  • the stretch rod control valve comprises a 5/2 valve.
  • the stretch rod control valve comprises a proportional valve.
  • the stretch rod control valve comprises a first pilot valve input and second pilot valve input, wherein the second pilot valve input comprises a valve member having a greater cross-sectional area than a valve member with the first pilot valve input such that an equal fluid pressure applied to first and second pilot valve inputs, actuates the stretch rod control valve.
  • a solenoid valve provides a pilot fluid to the second pilot valve input.
  • the at least one valve comprises a quick exhaust valve.
  • the at least one valve comprises a check valve.
  • the at least one second valve comprises a quick exhaust valve.
  • the at least one second valve comprises a check valve.
  • the barrel and the stretch rod are at least one of pneumatic and hydraulic.
  • the at least one valve having a body defined by the front end cover comprises both a stretch rod control valve and a quick exhaust valve.
  • the at least one valve having a body defined by the front end cover comprises both a stretch rod control valve and a check valve.
  • the at least one valve having a body defined by the front end cover comprises a stretch rod control valve, a quick exhaust valve, and a check valve.
  • a method of manufacturing a stretch cylinder comprises the steps of:
  • front end cover attaching a front end cover and a rear end cover to opposing ends of the barrel, wherein the front end cover comprises at least one valve having a body defined by the front end cover;
  • the rear end cover comprises at least one valve having a body defined by the rear end cover, and wherein the at least one valve having a body defined by the rear end cover is in fluid communication through the internal fluid conduit with the at least one valve having a body defined by the front end cover.
  • the step of providing an internal fluid conduit with the barrel comprises forming the conduit by an extrusion of the barrel.
  • the at least one valve having a body defined by the front end cover comprises a control valve.
  • control valve comprises a 5/2 valve.
  • control valve comprises a proportional valve.
  • control valve comprises a first pilot valve input and a second pilot valve input
  • second pilot valve input comprises a valve member having a greater cross-sectional area than a valve member with the first pilot valve input such that an equal fluid pressure applied to the first and second pilot valve inputs actuates the control valve.
  • the method of manufacturing a stretch cylinder further comprises the step of providing a solenoid valve that provides a pilot fluid to at least one of the first and second pilot valve inputs.
  • a method of using a stretch cylinder comprises the steps of:
  • a fluid supply to a front end cover, wherein the front end cover is attached to a barrel having an internal fluid conduit and an actuatable stretch rod that extends and retracts from the barrel;
  • the rear end cover comprises at least one valve having a body defined by the rear end cover, and wherein the at least one valve having a body defined by the rear end cover is in fluid communication through the internal fluid conduit with the at least one valve having a body defined by the front end cover.
  • the internal fluid conduit with the barrel is formed by an extrusion of the barrel.
  • the valve having a body defined by the front end cover comprises a control valve.
  • control valve comprises a 5/2 valve.
  • control valve comprises a proportional valve.
  • control valve comprises a first pilot valve input and a second pilot valve input
  • second pilot valve input comprises a valve member having a greater cross-sectional area than a valve member with the first pilot valve input such that an equal fluid pressure applied to the first and second pilot valve inputs actuates the control valve
  • the method of using a stretch cylinder further comprises the step of providing a solenoid valve that provides a pilot fluid to at least one of the first and second pilot valve inputs.
  • a solenoid valve that provides a pilot fluid to at least one of the first and second pilot valve inputs.
  • at least one second valve has a body defined by the rear end cover.
  • the internal fluid conduit is in fluid communication with a check valve.
  • the step of exhausting the fluid from the fluid supply from a port defined by at least one of the front end cover and the rear end cover comprises a quick exhaust valve.
  • FIG. 1 illustrates a prior art stretch cylinder
  • FIG. 2 illustrates a cross section of the prior art stretch cylinderof FIG. 1 ;
  • FIG. 3 illustrates a view of an embodiment of a stretch cylinder
  • FIG. illustrates aview of a barrel according to an embodiment
  • FIG. 5 is a schematic diagram of an embodiment of a stretch cylinder according to an embodiment
  • FIG.6 illustrates a view of a front end cover of a stretch cylinder according to an embodiment
  • FIG. 7 illustrates a view of thefront end cover of a stretch cylinderof FIG. 6
  • FIG. 8 illustrates an alternate view of arear end cover of astretch cylinderaccording to an embodiment
  • FIG. 9 illustrates a view of an alternate rear end cover of a stretch cylinder according to an alternate embodiment
  • FIG. 10 illustrates a view of an alternate front end cover of a stretch cylinder according to an alternate embodiment.
  • FIGS. 1-10 and the following description depict specific examples to teach those skilled in the art how to make and use the best mode of embodiments of a stretch cylinder andrelated methods. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations from these examples that fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. As a result, the invention is not limited to the specific examples described below, but only by the claims and their equivalents.
  • FIGS, land 2 illustrate a prior art stretch cylinder 100.
  • the stretch rod control valve 103 is adapted to control movement of the stretch rod 102 using pressurized fluid provided from a pressurized fluid source 1 13 via a fluid supply conduit 106.
  • the pressurized fluid may comprise a liquid or a gas.
  • the stretch rod control valve 103 may be suitable for use as a pneumatic or a hydraulic valve. While the pressurized fluid provided to the stretch rod control valve 103 may be at any suitable pressure, typically the pressurized fluid source 1 13 is at a pressure between approximately 10 and 16 bar (145 and 232 psi).
  • the stretch rod control valve 103 comprises a proportional valve in some embodiments, the pressure of the fluid delivered to the barrel 101 may be at a pressure less than the pressurized fluid source 1 13.
  • the stretch rod control valve 103 comprises a traditional valve, in which case, the pressure supplied to the barrel 101 comprises approximately the same pressure supplied to the stretch rod control valve 103.
  • the blow-mold valve 104 is adapted to control a pressurized gas supply to/from the mold cavity 105. While the pressurized gas is typically air, other gases may be desired depending on the particular application. In the prior art example shown in FIG. 2, the pressurized gas is received by the blow-mold valve 104 from a high-pressure gas supply 1 14 via a pressurized fluid supply conduit 107.
  • the pressurized gas supplied to the blow-mold valve 104 may be at a pressure around 40 bar (580 psi), for example, without limitation. Other pressures are certainly contemplated by the present invention.
  • the pressurized gas can be provided to the mold cavity 105 through an opening 108 defined between the preform 1 1 1 and the stretch rod 102.
  • the conduits or other fluid communication paths between the valves 103, 104 and the barrel 101 are not shown in FIG. 2 in order to minimize the complexity of the drawing.
  • the blow-mold valve 104 in this example comprises a proportional valve
  • the fluid communication path formed in the valve 104 for providing the pressurized gas to the mold cavity 105 may be restricted, resulting in a decreased pressure being provided to the mold cavity 105.
  • the stretch rod control valve 103 and the blow-mold valve 104 may be in electrical communication with one another.
  • the two valves 103, 104 are in electrical communication via cable 109 (FIG. 1); however, the two valves 103, 104 could communicate via a wireless communication interface. Additionally, the two valves 103, 104 may be pneumatic or hydraulic, without the need for electricity or electrical connections.
  • FIG. 1 Further shown in FIG. 1 is a cable 1 10, which provides an electrical communication interface between the stretch rod control valve 103 and a position sensor 230a-b (See FIG. 2) provided in the barrel 101.
  • the position sensor 230a-b may provide a signal to the stretch rod control valve 103 indicating a position of the stretch rod 102 relative to the barrel 101, for example.
  • a cable 1 12 Additionally shown in FIG. 1 is a cable 1 12.
  • the cable 1 12 can provide an electrical communication interface between the blow-mold valve 104 and a valve controller, such as an external processing system (not shown).
  • the cable 1 12 may also provide power to the valves 103, 104 if the valves are electrically actuated, such as for solenoid-controlled valves.
  • the processing system may comprise a microprocessor, a CPU, or some other processing device. The processing system may be distributed among multiple devices.
  • the processing system may include an internal and/or an external storage system.
  • the processing system may include various valve set-points and stretch rod position set- points to accommodate various blow-molding applications.
  • the processing system may include a user interface such as a monitor, keyboard, and mouse, etc., as is well known in the art.
  • the processing system may allow a user or operator to control the valves 103, 104.
  • each of the valves 103, 104 may include a programmable logic controller (PLC) (not shown) and the cable 1 12 can be provided to supply power to the valves 103, 104.
  • the PLC may be provided to control the valve's solenoid and/or provide feedback to the valve's controller.
  • the use of a PLC may reduce the response time of the valves 103, 104 thereby providing increased accuracy.
  • the PLC may provide an output signal to a user or operator via the cable 1 12.
  • FIG. 2 shows a cross-sectional view of a prior art stretch cylinder 100.
  • the valves 103, 104 are shown schematically. Further, it should be appreciated that the electrical cablesl09, 1 10, 1 12 are not shown in FIG. 2 in order to simplify the complexity of the drawing.
  • the stretch rod control valve 103 is in fluid communication with a first port 221 and a second port 222 formed in the barrel 101.
  • a piston 202 separates the barrel 101 into a first chamber 231 and a second chamber 232. According to an embodiment of the invention, the piston 202 is coupled to the stretch rod 102.
  • the piston 202 and stretch rod 102 may be movable within the barrel 101.
  • the piston 202 may include a sealing member 203, which can provide a substantially fluid-tight seal between the piston 202 and the barrel 101. Further, the barrel 101 can include additional sealing members 250, 251, 252, which form substantially fluid-tight seals with the stretch rod 102.
  • the sealing members 203 and 250-252 can prevent pressurized fluid from passing between chambers 231, 232 or from the second chamber 232 to the mold cavity 105.
  • the first port 221 may be in fluid communication with the first chamber 231 and the second port 222 is in fluid communication with the second chamber 232. When pressurized fluid is provided to the first port 221, the first chamber 231 is pressurized thereby actuating the piston 202 and thus the stretch rod 102 in a first direction. Conversely, when pressurized fluid is provided to the second port 222, the second chamber 232 is pressurized, which actuates the piston 202 and thus the stretch rod 102 in a second direction, substantially opposite the first direction.
  • the position sensor 230 which comprises a first sensor portion 230a coupled to the barrel 101 and a second sensor portion 230b coupled to the piston 202.
  • the first sensor portion 230a may be in communication with the stretch rod control valve 103 via the cable 1 10.
  • the first portion of the position sensor 230a may also comprise one or more magnetic sensors while the second portion 230b comprises a magnet.
  • One example of a position sensor that may be used with the present invention is disclosed in United States Patent 7,263,781, which is assigned to the applicants of the present invention. However, it should be appreciated that other position sensors— or no position sensor— may certainly be utilized with the present invention without departing from the scope of the invention.
  • the stretch rod control valve 103 may comprises a proportional valve. However, the stretch rod control valve 103 does not have to comprise a proportional valve and other types of valves may be used. In the example provided in FIG. 2, the stretch rod control valve 103 comprises a 5/3 proportional valve. The stretch rod control valve 103 may comprise a 5/3 proportional spool valve, for example. The stretch rod control valve 103 may comprise a solenoid-actuated proportional spool valve. A spring 265' or other biasing member may be provided to de-actuate the stretch rod control valve 103 or bring this valve 103 to a default position. A second solenoid (not shown) may be provided. According to the prior art example, in a de-actuated position, the stretch rod control valve 103 is closed. In a related example, in the de-actuated position, pressurized fluid is not provided to or exhausted from the first or second chambers 231, 232.
  • a solenoid 265 is used to open the stretch rod control valve 103 towards one or more actuated positions. Further, in embodiments where the stretch rod control valve 103 comprises a proportional valve, the solenoid 265 may be used to actuate the valve 103 to positions between a de-actuated position and a fully actuated position based on the set point signal provided to the solenoid 265. As mentioned briefly above, the set point signal may be provided by the processing system according to the desired operating parameters.
  • pressurized fluid is provided from a first port 103 a to a second port 103b.
  • the first port 103a is adapted to receive a pressurized fluid.
  • the first port 103a is shown in fluid communication with the pressurized fluid source 1 13 while the second port 103b is in fluid communication with the first port 221 formed in the barrel 101 via fluid pathway 241.
  • the first port 103a is selectively in fluid communication with the second port 103b when the stretch rod control valve 103 is opened towards the first actuated position.
  • pressurized fluid can be exhausted from the third port 103c to the fourth port 103d.
  • the stretch rod control valve 103 can be actuated to a position between the de-actuated position and the first actuated position and only partially opened.
  • partial positioning of the valve is only applicable to examples having a proportional valve arrangement.
  • the stretch rod control valve 103 When the stretch rod control valve 103 is actuated and opened towards a second actuated position, the first port 103a is brought into fluid communication with the third port 103c and the second port 103b is brought into fluid communication with the fifth port 103e, which comprises an exhaust. Therefore, when the stretch rod control valve is opened towards the second actuated position, the stretch rod control valve 103 provides pressurized fluid to the second chamber 232 and exhausts the first chamber 231 to move the piston 202 and thus, the stretch rod 102 in a second longitudinal direction.
  • the blow-mold valve 104 may comprise a proportional valve.
  • the blow-mold valve 104 comprises a solenoid- actuated proportional valve with a solenoid 266; however, in other embodiments, the blow-mold valve 104 could be fluid actuated.
  • a spring 266' or other biasing member is provided to bias the blow-mold valve 104 to a de-actuated or default position.
  • a second solenoid (not shown) could be provided.
  • the blow-mold valve 104 may comprise a proportional spool valve, for example.
  • the blow-mold valve 104 comprises a 3/3-way proportional spool valve.
  • a separate exhaust valve is not required and the blow-mold valve 104 can pressurize the mold cavity 105 as well as exhaust the mold cavity 105.
  • a separate exhaust valve may be provided to exhaust the mold cavity 105 at the end of a molding cycle.
  • the blow-mold valve 104 is not limited to a 3/3 valve, but rather other valves may be utilized such as a 3/2, a 2/2, etc.
  • a second port 104b may be open to exhaust when the blow-mold valve 104 is in a de-actuated position.
  • a first port 104a is in fluid communication with the second port 104b, thereby providing pressurized gas to a third port 223 formed in the barrel 101.
  • the third port 223 formed in the barrel 101 may be in fluid communication with a preform 1 1 1 or mold cavity 105 when the barrel 101 is coupled to the preform 1 1 1 or mold cavity 105. Therefore, when the blow-mold valve 104 is in a first actuated position, the pressurized gas provided to the first port 104a from the pressurized gas source 1 14is provided to the mold cavity 105.
  • the pressure of the gas provided to the second port 104b, and thus the mold cavity 105 is less than the pressure supplied to the first port 104a. This is because the fluid communication path between the first port 104a and the second port 104b is only partially opened, thereby restricting flow through the blow-mold valve 104 and creating a pressure drop.
  • the amount of the pressure drop may depend on the precise position of the blow-mold valve 104 in combination with the pressure of the pressurized gas source 1 14.
  • the position of the blow-mold valve 104 can be determined based on the set point signal received by the solenoid 266, for example.
  • the set point signal may be received from a controller (not shown) or a PLC (not shown) associated with the blow-mold valve 104, as discussed above.
  • a controller not shown
  • a PLC not shown
  • the set point signal may be received from a controller (not shown) or a PLC (not shown) associated with the blow-mold valve 104, as discussed above.
  • FIG. 3 illustrates a stretch cylinder 300 according to an embodiment.
  • the embodiment provides a stretch rod control valve 103, a quick exhaust valve 302, a check valve 304, and fluid conduit 306 (see FIG. 4) that are integrated into the barrel 101 and/or end covers 308, 310.
  • the fluid conduit 306 is integrated into the barrel 101.
  • FIG. 4 illustrates an extrusion formed as a barrel 101 wherein the fluid conduit 306 is integrally formed with the material from which the barrel 101 is made.
  • the barrel is made from a metal that comprises aluminum, for example, without limitation.
  • the fluid conduit 306 is formed as part of the extrusion process, but may alternatively be drilled, milled, cast formed, or formed through any manner known in the art.
  • a seal 312, such as an O-ring for example, without limitation, is disposed between each end of the fluid conduit 306 and each end cover 308, 310 so that a fluid-tight seal is made between the fluid conduit 306 and the valves integrated into the end covers 308, 310.
  • the barrel 101 may be round, square, polygonal, and/or comprise sharp or rounded edges, have concavities and/or convex regions, and/or combinations thereof.
  • a front end cover 308 is attached to a front end of the barrel 101, and a rear end cover 310 is attached to a second end of the barrel 101.
  • the front end cover 308 comprises a stretch rod control valve 103 and quick exhaust valve 302, while the rear end cover 310 comprises the check valve 304.
  • the control vale 103 and check valve 304 are located in the rear end cover 310, while the exhaust valve 302 is in the front end cover 308.
  • the stretch rod control valve 103, check valve 304, and quick release valve 302 are located in either the front or rear end cover 308, 310.
  • a solenoid valve is located in at least one of the end covers 308, 310.
  • FIG. 5 illustrates an embodiment of a valve diagram according to an embodiment.
  • a fluid supply 502 is attached to a first port 103adefined by the front end cover 308 or the rear end cover 310 (depending on where the stretch rod control valve 103 is located).
  • the first port 103a is a fluid path with the stretch rod control valve 103.
  • the stretch rod control valve 103 is a proportional valve, but thestretch rod control valve 103 does not have to comprise a proportional valve and other types of valves may be used.
  • the stretch rod control valve 103 comprises a 5/2 valve.
  • the stretch rod control valve 103 may comprise a spool valve.
  • the stretch rod control valve 103 may comprise a 5/2 proportional valve, for example.
  • the stretch rod control valve 103 may comprise a solenoid-actuated proportional valve.
  • a spring 265' (see FIG. 2 for example) or other biasing member may be provided to de-actuate the valve 103 or bring the valve 103 to a default position.
  • a second solenoid 504 valve may be provided, and incorporated within an end cover 308, 310.
  • a second solenoid 504 valve may be provided, and connected to the stretch rod control valve 103 remotely. The second solenoid valve 504 is used to open the stretch rod control valve 103 towards one or more actuated positions.
  • the stretch rod control valve 103 when the second solenoid valve 504 is in a de-actuated position (see as illustrated in FIG. 5), the stretch rod control valve 103allows fluid to pass from the first port 103a to a second port 103b— also incorporated within an end cover 308, 310. In this de-actuated position,pressurized fluid is provided to the second chamber 232, which causes the stretch rod 102 to retract and be maintained in a retracted state.
  • Pilot lines 506, 508 are in fluid communication with the fluid supply 502.
  • the first pilot line 506 is in communication with a first pilot valve input 510 with the stretch rod control valve 103.
  • fluid from the fluid supply line 514 passes through a first port 504a of the solenoid valve 504 to a second port 504b of the solenoid valve 504. This allows fluid to travel through the second pilot line 508 to a second pilot valve input 512.
  • the second pilot valve input 512 is proximate a valve member (not shown) having a greater cross-sectional area than a valve member (not shown) proximate thefirst pilot valve input 510, so an equal pressure applied to both pilot valves 510, 512 will cause the stretch rod control valve 103 to actuate.
  • the quick exhaust valve 302 which, in general, is well known in the art, allows the second chamber 232 to fill with fluid, but when a rapid loss in pressure associated with the second port 103b is experienced, the imbalance in pressure between the first port 302a and 302b causes the quick release valve 302 to open an exhaust port 302c, which allows rapid exhausting of the fluid pressure within the second chamber 232.
  • a silencer 516 in fluid communication with the exhaust port 302c may be installed to reduce the sound associated with such rapid system purging.
  • fluid from the fluid supply 502 is cut off from the second pilot line 508 and the first pilot valve input 510 bias overcomes the bias imposed by the second pilot valve input 512.
  • Fluid in the second pilot line 508 is exhausted through the second port 504b and through the solenoid valve 504 to exit through a third port 504c and optionally out through a silencer 516.
  • the first port 103a of the stretch rod control valve 103 is placed in fluid communication with the second port 103b. This allows fluid from the fluid supply 502 to reach the second chamber 232.
  • the third port 103c is placed in fluid communication with a fourth port 103d. This allows fluid from the first chamber 231 to escape the barrel 101.
  • the check valve 304 is oriented such that fluid flow from the first chamber 231 to the stretch rod control valve 103 is restricted so to provide fluid cushioning, and fluid passing through the fluid conduit 306 that exits via the fourth port 103d passes through a needle valve 518, which may be adjustable.
  • the exhausting of the first chamber 231 through the needle valve 518 serves as means for metered cylinder speed control.
  • FIGS. 6-8 illustrate the front 308 (FIGS. 6 and 7) and rear 310 (FIG. 8) end covers.
  • the end covers 308, 310 are constructed at least partially from a metal, such as aluminum, steel, or stainless steel, for example, without limitation.
  • the front end cover 308 is constructed so that a first face 602 is configured to engage the barrel 101, and comprises a plurality of orifices.
  • the third port 103c is positioned to fluidly engage the fluid conduit 306 of the barrel 101.
  • a seat is formed with the third port 103c to accept a seal 312, such as an O-ring for example.
  • the first face 602 also comprises the quick exhaust port 302c and first port 103a.
  • FIG. 8 illustrates an embodiment of the rear end cover 310, and also illustrates a bore 702 that accommodates the stretch rod 102.
  • An orifice 704 that accommodates the check valve 304 is disposed in the rear end cover 310.
  • a passage 706 fluidly connects the rear end cover 310 to the fluid conduit 306 of the barrel 101.
  • an orifice 710 is provided that provides fluid flow for an adjustable cushion with the stretch cylinder 300.
  • FIGS. 9 and 10 illustrate alternate embodiments of the end covers 308a, 310a wherein the front end cover 308a comprises only an exhaust valve 302, while the rear end cover 310a comprises the check valve 304 and stretch rod control valve 103.
  • the front end cover 308 or rear end cover 310 comprises the stretch rod control valve 103, quick exhaust valve 302, and check valve 304.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un cylindre d'étirage (300) qui comprend un bloc (101) et une tige d'étirage actionnable (102) qui s'étend et se rétracte à partir du bloc (101). Le cylindre d'étirage (300) comprend en outre un couvercle d'extrémité avant (308) et un couvercle d'extrémité arrière (310) qui sont fixés à des extrémités opposées du bloc (101). Une conduite de fluide interne (306) avec le bloc (101) raccorde de manière fluidique le couvercle d'extrémité avant (308) au couvercle d'extrémité arrière (310). Au moins une soupape comprend un corps défini par le couvercle d'extrémité avant (308).
PCT/CN2014/082485 2014-07-18 2014-07-18 Cylindre de moulage par soufflage avec étirage et procédé associé WO2016008151A1 (fr)

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PCT/CN2014/082485 WO2016008151A1 (fr) 2014-07-18 2014-07-18 Cylindre de moulage par soufflage avec étirage et procédé associé

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Application Number Priority Date Filing Date Title
PCT/CN2014/082485 WO2016008151A1 (fr) 2014-07-18 2014-07-18 Cylindre de moulage par soufflage avec étirage et procédé associé

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4379221A1 (fr) * 2022-11-30 2024-06-05 Chen Sound Industrial Co., Ltd. Cylindre de puissance avec électrovanne intégrée

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469704A (en) * 1992-03-20 1995-11-28 Mannesmann Rexroth Gmbh Hydraulic drive apparatus comprising a cylinder
CN201486954U (zh) * 2009-06-19 2010-05-26 长拓流体科技股份有限公司 空(油)增压缸改进装置
CN201705751U (zh) * 2010-03-18 2011-01-12 西安英诺瓦物探装备有限公司 反作用液压伺服密封油缸
CN101059140B (zh) * 2006-04-22 2011-07-06 费斯托股份有限两合公司 线性驱动装置
EP2420681A2 (fr) * 2010-08-18 2012-02-22 Robert Bosch GmbH Entraînement linéaire hydraulique
KR101176924B1 (ko) * 2012-04-18 2012-08-30 서호덕 편 로드 실린더의 피스톤 정압베어링

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469704A (en) * 1992-03-20 1995-11-28 Mannesmann Rexroth Gmbh Hydraulic drive apparatus comprising a cylinder
CN101059140B (zh) * 2006-04-22 2011-07-06 费斯托股份有限两合公司 线性驱动装置
CN201486954U (zh) * 2009-06-19 2010-05-26 长拓流体科技股份有限公司 空(油)增压缸改进装置
CN201705751U (zh) * 2010-03-18 2011-01-12 西安英诺瓦物探装备有限公司 反作用液压伺服密封油缸
EP2420681A2 (fr) * 2010-08-18 2012-02-22 Robert Bosch GmbH Entraînement linéaire hydraulique
KR101176924B1 (ko) * 2012-04-18 2012-08-30 서호덕 편 로드 실린더의 피스톤 정압베어링

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4379221A1 (fr) * 2022-11-30 2024-06-05 Chen Sound Industrial Co., Ltd. Cylindre de puissance avec électrovanne intégrée

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