WO2022244755A1 - アキュムレータ用ガス供給装置及び成形機 - Google Patents
アキュムレータ用ガス供給装置及び成形機 Download PDFInfo
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- WO2022244755A1 WO2022244755A1 PCT/JP2022/020464 JP2022020464W WO2022244755A1 WO 2022244755 A1 WO2022244755 A1 WO 2022244755A1 JP 2022020464 W JP2022020464 W JP 2022020464W WO 2022244755 A1 WO2022244755 A1 WO 2022244755A1
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- gas
- accumulator
- pressure
- port
- supply device
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/82—Hydraulic or pneumatic circuits
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
Definitions
- the present disclosure relates to an accumulator gas supply device (hereinafter sometimes simply referred to as a "supply device”) that supplies gas to an accumulator.
- the present disclosure also relates to a molding machine having the accumulator and supply device described above.
- the gas is, for example, nitrogen gas (hereinafter sometimes simply referred to as "nitrogen").
- Molding machines are, for example, die casting machines, injection molding machines or extruders.
- a molding machine drives driving elements such as hydraulic cylinders with hydraulic fluid (eg, oil) supplied from an accumulator.
- the accumulator for example, uses the pressure of compressed gas to deliver hydraulic fluid.
- the gas nitrogen, which is inexpensive among inert gases, is usually used.
- Gas is charged into the accumulator from, for example, a gas tank (gas cylinder). As the gas is filled, the accumulator is also pressure-accumulated (operation to increase the pressure). Such filling of gas will be described later in detail with reference to FIG. 4(a).
- Patent Literature 3 discloses a booster that supplies hydraulic fluid to an accumulator.
- Patent Documents 1 to 3 can be regarded as disclosing techniques related to adjustment of the pressure of the accumulator.
- the pressure of the accumulator fluctuates due to changes in the temperature of the molding machine and the like. Hydraulic fluid is supplied or drained to reduce such fluctuations.
- the conventional gas filling method and/or accumulator pressure adjustment method causes various inconveniences. It is desirable to eliminate at least one of the disadvantages. Thus, it would be desirable to provide a device that can conveniently fill the accumulator with gas and/or adjust the pressure of the accumulator.
- Specific problems in the conventional gas charging method and/or the accumulator pressure adjusting method will be described later in detail with reference to FIG. 4(a). However, the technology according to the present disclosure does not necessarily require the ability to solve the specific problems described later.
- the accumulator gas supply device supplies the gas to the accumulator by applying the driving force of the electric motor to the gas without using the hydraulic fluid.
- a molding machine includes the accumulator gas supply device, the accumulator, and a drive section driven by a hydraulic fluid supplied from the accumulator.
- gas filling and/or pressure adjustment of the accumulator can be suitably performed.
- FIG. 2 is a schematic diagram showing the configuration of the supply device according to the first embodiment; 4 is a graph for explaining the operation of the supply device of FIG. 1; 4 is a flowchart illustrating a procedure of processing executed by a control device of the supply device of FIG. 1; FIG. 4A is a schematic diagram showing a gas supply mode according to a comparative example, and FIG. 4B is a schematic diagram for explaining a gas supply mode according to a modification.
- the schematic diagram which shows the structure of the supply apparatus which concerns on 2nd Embodiment. 6 is a graph for explaining the operation of the supply device of FIG. 5; FIG. 6 is a flowchart illustrating a procedure of processing executed by a control device of the supply device of FIG. 5; FIG.
- FIG. 10 is a schematic diagram showing the configuration of an injection device of the die casting machine of FIG. 9;
- FIG. 1 is a schematic diagram showing the configuration of a supply device 1 according to the first embodiment. Note that the vertical direction in FIG. 1 may or may not match the actual vertical direction. Also, this match and mismatch may or may not be common among the components shown in FIG.
- the supply device 1 is included in the molding machine 101, for example.
- the molding machine 101 has, for example, an accumulator 103 and a control device 105 in addition to the supply device 1 .
- the supply device 1 supplies gas to the accumulator 103 according to a control signal from the control device 105 .
- the supply device 1 and the control device 105 are treated as separate devices. However, part or all of the control device 105 may be regarded as part of the supply device 1 .
- the accumulator 103 supplies hydraulic fluid to one or more drive units (not shown here) of the molding machine 101 by gas pressure.
- the valve unit 107 that controls the flow of hydraulic fluid from the accumulator 103 to the drive is schematically indicated by a rectangle.
- the hydraulic fluid in the accumulator 103 does not reach the drive and/or there is almost no flow of the hydraulic fluid, so that the accumulator 103 only applies hydraulic pressure (pressure of the hydraulic fluid) to the drive. .
- hydraulic pressure pressure of the hydraulic fluid
- such a case may also be expressed as supplying hydraulic fluid from the accumulator 103 to the drive unit. The same applies to the flow of hydraulic fluid and the flow of gas in other parts.
- the gas supplied to the accumulator 103 may be of any suitable type, for example inert gas or air. Nitrogen can be mentioned as an inert gas. In the description of the embodiments, basically the gas is nitrogen.
- the type of hydraulic fluid discharged by the accumulator 103 may also be made appropriate, and may be oil, for example. It should be noted that it is also possible to use other liquids such as water as the working liquid.
- the outline of the molding machine 101 will be described below. After that, the accumulator 103, the supply device 1 and the control device 105 will be described in order.
- Molding machine 101 is, for example, a die casting machine, an injection molding machine, or an extruder.
- the configuration of the molding machine 101 may be various configurations except for the configuration and operation (control) of the supply device 1, and may be the same as a known configuration, for example.
- a die casting machine for example, fills (injects) molten metal (molten metal) into a cavity of a predetermined shape configured between two or more molds that are opened and closed. As a result, a molded product (die-cast product) made of the solidified metal and having the predetermined shape is produced.
- An injection molding machine for example, fills (injects) molten resin into a cavity of a predetermined shape configured between two or more molds that are opened and closed. As a result, a molded product made of the solidified resin and having the predetermined shape is produced.
- An extruder for example, extrudes molten metal or resin toward a through-hole formed in a mold. As a result, a molded product made of solidified metal or resin and extending in the same cross-sectional shape as the cross-sectional shape of the through-hole (cross-sectional surface orthogonal to the through-hole direction) is produced.
- the accumulator 103 supplies hydraulic fluid to the hydraulic elements of the molding machine 101 to drive the hydraulic elements.
- Hydraulic elements include, for example, hydraulic cylinders and hydraulic motors. In the description of this embodiment, a hydraulic cylinder is basically taken as an example.
- a hydraulic cylinder has, for example, a cylinder member and a piston housed inside the cylinder member.
- the piston and the cylinder member move relative to each other in the axial direction.
- the member connected to the piston and the member connected to the cylinder member move relative to each other.
- the member that moves in the absolute coordinate system by this relative movement may be either the piston or the cylinder member.
- the molding machine 101 has various drive units.
- the hydraulic element to which hydraulic fluid is supplied from the accumulator 103 may constitute any one of various drive units.
- any of the three types of molding machines described above has a drive section that drives a plunger (including a screw) that pushes a molding material (eg, metal or resin) toward a mold.
- This drive may consist of a hydraulic cylinder connected in series with the plunger and supplied with hydraulic fluid from an accumulator 103 .
- die casting machines and injection molding machines have a mold clamping device that opens and closes the mold, and an extrusion device that extrudes the molded product from the mold after the molding material has solidified.
- a hydraulic cylinder to which hydraulic fluid is supplied from the accumulator 103 may be used as the drive section of the mold clamping device or the drive section of the extrusion device.
- the accumulator 103 may supply the working fluid to only one type of driving section among the plurality of types of driving sections described above, or may supply the working liquid to two or more types of driving sections.
- Drives that are not supplied with hydraulic fluid from the accumulator 103 may be hydraulic with hydraulic fluid supplied from another source (e.g., a pump or other accumulator), or they may be electrically driven. good.
- the accumulator 103 may have various configurations capable of delivering the hydraulic fluid by the pressure of the compressed gas, and may have, for example, a known configuration.
- Accumulator 103 may be, for example, a piston (as shown), bladder, diaphragm, or other pneumatic accumulator.
- the piston type is basically taken as an example.
- the piston-type accumulator 103 has a cylinder member 109 and a piston 111 that can slide in the cylinder member 109 in the axial direction.
- the interior of the cylinder member 109 is partitioned by the piston 111 into a gas chamber 109a and a liquid chamber 109b. Gas is accommodated in the gas chamber 109a.
- the hydraulic fluid is accommodated in the fluid chamber 109b.
- the gas contained in gas chamber 109a is compressed to a pressure higher than atmospheric pressure. The pressure of this compressed gas causes the piston 111 to move toward the liquid chamber 109 b , and the hydraulic fluid in the liquid chamber 109 b is supplied to the drive section of the molding machine 101 .
- the bladder instead of the piston, the bladder separates the gas chamber and the liquid chamber.
- a diaphragm separates the gas chamber from the liquid chamber instead of the piston.
- Other accumulators include, for example, a structure in which the gas and the working liquid are in direct contact (see gas accumulator 115A in FIG. 4A, which will be described later).
- a packing 113 such as an O-ring may be provided between the cylinder member 109 and the piston 111 in order to improve the sealing between the gas chamber 109a and the liquid chamber 109b.
- the packing 113 may be interposed between the two so that the two do not have to be in direct contact with each other. The same applies to other members.
- the piston-type accumulator 103 can be used in any orientation with respect to the vertical direction. Generally, however, gas chamber 109a is located above liquid chamber 109b, as shown in FIG.
- the pressure in the gas chamber 109a when the accumulator 103 is used may be set to an appropriate size.
- the pressure in the gas chamber 109a is at least higher than the atmospheric pressure.
- the lowest pressure may be, for example, 10 MPa or higher or 15 MPa or higher.
- the supply device 1 supplies gas to the gas chamber 109 a of the accumulator 103 .
- the supply device 1 can be used to fill a gas chamber 109a which is not filled with gas (on the other hand it has a pressure equivalent to atmospheric pressure).
- the supply device 1 can also be used to adjust (finely adjust) the pressure of the accumulator 103 by supplying (and/or discharging) additional gas to the gas chamber 109a filled with gas.
- an aspect used for adjusting pressure is taken as an example.
- the supply device 1 has a gas tank 3 (hereinafter sometimes simply referred to as "tank 3") that stores gas, and a compression section 5 that compresses the gas from the tank 3.
- the supply device 1 also has a gas circuit 7 that connects the tank 3, the compression section 5, and the accumulator 103 and controls the flow of gas therebetween.
- the tank 3 is regarded as part of the supply device 1 .
- the tank 3 may be connected to the compression section 5 (more precisely, the gas circuit 7) so as to be exchangeable with another tank. Therefore, the tank 3 may be regarded as a separate element from the feeding device.
- the pressure of the accumulator 103 rises as the gas in the tank 3 is supplied to the gas chamber 109a. Further, the pressure of the accumulator 103 is lowered by discharging the gas in the gas chamber 109a to the tank 3. In this way the pressure in the accumulator 103 is regulated.
- the compression unit 5 compresses the gas supplied from the tank 3 so that the pressure of the gas is higher than the pressure in the gas chamber 109a. As a result, gas flows from the compression section 5 to the gas chamber 109a, and the pressure in the accumulator 103 rises.
- the gas in the mode in which the tank 3 and the gas chamber 109a are directly connected, the gas cannot be supplied from the tank 3 to the gas chamber 109a unless the pressure of the tank 3 is higher than the pressure of the gas chamber 109a.
- the gas in the tank 3 can be supplied to the gas chamber 109a by the compression unit 5. That is, the pressure in the tank 3 can be made lower than the pressure in the accumulator 103 by providing the compression unit 5 .
- the gas circuit 7 is configured to allow such operation.
- the tank 3 may be configured appropriately as long as it can contain gas.
- the shape, dimensions (capacity, etc.) and material of the tank 3 are arbitrary.
- the tank 3 may be configured similarly to a tank (cylinder) containing gas at high pressure to supply gas to the accumulator 103 that is not filled with gas, or may be configured as such. may have different configurations.
- the general shape of the tank 3 may be cylindrical or spherical.
- either height or width may be large.
- the tank 3 has a port (reference numeral omitted) connected to the gas circuit 7.
- the configuration of this port and its surroundings may be configured assuming attachment/detachment to/from the gas circuit 7, or may be configured not assuming attachment/detachment.
- the former can be, for example, a detachable part in a tank containing gas at high pressure for supplying gas to an accumulator 103 which is not filled with gas.
- the attachment/detachment part include those in which an inner screw or an outer screw is formed on the cap of the stop valve, and those having a special structure that allows attachment and detachment with one touch.
- a mode in which the flow path of the gas circuit 7 and the tank 3 are joined can be cited.
- the tank 3 may be used in any orientation. From another point of view, the position of the port connected to the gas circuit 7 in the tank 3 is arbitrary, and the relationship between the shape of the tank 3 and the vertical direction is also arbitrary. For example, in the illustrated example, the port connected to the gas circuit 7 is located at the upper end of the tank 3 . However, the port may be located in the lower portion of the tank 3 .
- the pressure in the tank 3 may be set appropriately when the supply device 1 is used. As already mentioned, the pressure of the tank 3 in use may be lower than the pressure of the gas chamber 109a.
- the pressure of the gas chamber 109a here is the pressure of the gas chamber 109a already filled with a certain amount of gas, for example, 10 MPa or more or 15 MPa or more. Therefore, for example, the pressure in the tank 3 may be 10 MPa or less, 5 MPa or less, or 1 MPa or less on condition that it is lower than the pressure in the accumulator 103 .
- the pressure of the tank 3 during use may be higher than the atmospheric pressure (approximately 0.1 MPa), for example.
- the compression unit 5 is of an electric type. That is, the compression section 5 has an electric motor 9 .
- the driving force of the electric motor 9 By applying the driving force of the electric motor 9 to the gas from the tank 3 , the gas is supplied to the accumulator 103 .
- the driving force of the electric motor for driving the pump is applied to the gas even in a configuration (hydraulic configuration) in which hydraulic fluid is supplied from the pump to the accumulator to increase the pressure of the accumulator.
- the driving force of the electric motor that drives the pump is applied to the gas via the hydraulic fluid.
- the driving force of the electric motor 9 is applied to the gas without passing through the hydraulic fluid.
- the compression unit 5 has a compression cylinder 11 as a mechanism that directly compresses gas.
- the compression cylinder 11 has a cylinder member 13 and a piston 15 axially slidable within the cylinder member 13 .
- Gas in the tank 3 is supplied into the cylinder member 13 .
- the gas supplied into the cylinder member 13 is compressed by the axial movement of the piston 15 with respect to the cylinder member 13 .
- the driving force of the electric motor 9 may be applied to either the cylinder member 13 or the piston 15 . In this embodiment, a mode in which the driving force of the electric motor 9 is applied to the piston 15 is taken as an example.
- the electric motor 9 is, for example, a rotary type.
- the compression unit 5 includes, for example, a transmission mechanism 17 that transmits the rotation of the electric motor 9, and a linear motion (translational motion) that transmits the rotary motion from the transmission mechanism 17. and a conversion mechanism 19 for converting motion.
- the compression section 5 also has a support member 21 that contributes to supporting the electric motor 9 , the transmission mechanism 17 and the conversion mechanism 19 .
- the electric motor 9 has a stator that constitutes one of the armature and the field, and a rotor that constitutes the other of the armature and the field. The rotor rotates about its axis with respect to the stator.
- a specific configuration of the electric motor 9 may be made as appropriate.
- the electric motor 9 may be a DC motor or an AC motor, an induction motor or a synchronous motor, and may or may not have a brake.
- the electric motor 9 may function as a constant-speed electric motor provided in an open loop, or may function as a servomotor provided in a closed loop.
- the arrangement position, orientation, etc. of the electric motor 9 may be set as appropriate. As is clear from the fact that the transmission mechanism 17 that transmits the rotation of the electric motor 9 to the conversion mechanism 19 may be provided, the arrangement position, orientation, etc. of the electric motor 9 are arbitrary. In the illustrated example, the electric motor 9 is arranged in parallel with the conversion mechanism 19 so that the output shaft faces the side opposite to the compression cylinder 11 . Thereby, for example, shortening of the compression part 5 is achieved. Further, in the illustrated example, the main body (stator) of the electric motor 9 is fixed to the support member 21 .
- the transmission mechanism 17 is configured by, for example, a pulley/belt mechanism. Specifically, the transmission mechanism 17 includes a first pulley 23 fixed to the output shaft of the electric motor 9, a second pulley 25 fixed to a screw shaft 29 (described later) of the conversion mechanism 19, and these pulleys. It has a belt 27 stretched over. Therefore, when the electric motor 9 is rotated, the rotation is input to the conversion mechanism 19 through the first pulley 23, the belt 27 and the second pulley 25 in order.
- the transmission mechanism 17 may or may not shift gears. In the illustrated example, the diameter of the second pulley 25 is larger than the diameter of the first pulley 23, and the transmission mechanism 17 increases the speed.
- the transmission mechanism 17 may be another winding transmission mechanism (for example, a sprocket/chain mechanism), or may be a mechanism other than the winding transmission mechanism (for example, a gear mechanism).
- the transmission mechanism may change the direction of rotation, such as a gear mechanism including bevel gears.
- the rotation of the electric motor 9 may be directly input to the conversion mechanism 19 without the transmission mechanism 17 provided.
- the output shaft of the electric motor 9 may be coaxially connected to the screw shaft 29 .
- the conversion mechanism 19 is configured by a screw mechanism (for example, a ball screw mechanism or a slide screw mechanism) in the illustrated example.
- the screw mechanism has a screw shaft 29 and a nut 31 screwed onto the screw shaft 29 .
- One member of the screw shaft 29 and the nut 31 (the screw shaft 29 in the illustrated example) is restricted from moving in the axial direction (vertical direction in the drawing) with respect to the support member 21, and is allowed to rotate about the axis.
- the other member of the screw shaft 29 and the nut 31 (the nut 31 in the illustrated example) is allowed to move in the axial direction with respect to the support member 21, and is restricted from rotating about the axis. Therefore, by rotating the one member, the other member moves in the axial direction.
- the nut 31 and the screw shaft 29 may be appropriately supported.
- the screw shaft 29 is supported by a bearing (reference numerals omitted) provided in the support member 21 so as to be axially immovable and rotatable around the axis.
- the bearings are, for example, ball bearings.
- the nut 31 is fixed to the piston 15, and the rotation of the nut 31 about the axis is restricted by restricting the rotation of the piston 15 about the axis (described later).
- the stroke of the nut 31 (advance limit or retraction limit from another point of view) is defined by the length of the threaded range of the screw shaft 29 for the conversion mechanism 19 alone, for example.
- This stroke (driving limit) may or may not define an advance limit or a retraction limit of the piston 15 with respect to the cylinder member 13 . From another point of view, the conversion mechanism 19 may or may not be used for a full stroke.
- the nut 31 may be rotated to drive the screw shaft 29 in the axial direction.
- another conversion mechanism for example, a rack and pinion mechanism or a link mechanism
- a rack and pinion mechanism or a link mechanism may be provided.
- compression cylinder Inside the cylinder member 13, a cylinder chamber 13a to which gas is supplied from the tank 3 is formed. One axial end of the cylinder chamber 13 a is closed by a piston 15 . Therefore, the gas in the cylinder chamber 13a is compressed by the piston 15 moving toward the cylinder chamber 13a and the volume of the cylinder chamber 13a being reduced. Further, the cylinder chamber 13a is replenished with gas by moving the piston 15 to the opposite side of the cylinder chamber 13a and expanding the volume of the cylinder chamber 13a.
- the cylinder member 13 is, for example, cylindrical with an opening 13f on one side in the axial direction (upper side in FIG. 1).
- the cylinder member 13 has a peripheral surface portion 13c that surrounds the cylinder chamber 13a around its axis, and an end surface portion 13d that closes one axial end (lower end in FIG. 1) of the peripheral surface portion 13c.
- there is A space surrounded by the peripheral surface portion 13c, the end surface portion 13d, and the piston 15 serves as the cylinder chamber 13a.
- the opening 13f contributes to extending the piston 15 to the outside of the cylinder member 13. As shown in FIG. By extending the piston 15 to the outside, it is possible to transmit the driving force of the electric motor 9 to the piston 15 .
- the specific shape, size, material, etc. of the cylinder member 13 and the piston 15 are arbitrary.
- the inner surface of the cylinder member 13 and the piston 15 may have any shape. In one example, these shapes are circular.
- the cylinder member 13 may have a larger axial length or a larger diameter, and for example, the former is longer than the latter.
- the piston 15 extends axially with a substantially constant diameter. Further, the length of the piston 15 is such that the piston 15 extends from the opening 13f even when the piston 15 moves to the drive limit on the side of the end face portion 13d (downward in FIG. 1).
- the opening 13f has the same shape and diameter as the inner surface of the peripheral surface portion 13c so that the piston 15 can extend outside the cylinder member 13. As shown in FIG.
- the piston 15 has a cavity (not labeled) that opens to the side opposite to the cylinder chamber 13a, and part of the conversion mechanism 19 is accommodated in the cavity. That is, the conversion mechanism 19 and the piston 15 are provided concentrically.
- the compression section 5 is shortened. Specifically, for example, 60% or more or 80% or more of the length of the screw shaft 29 may be accommodated in the cavity when the piston 15 is positioned closest to the conversion mechanism 19 .
- the nut 31 is positioned at the rear end of the piston 15 and arranged concentrically with respect to the piston 15 so that substantially the entire nut 31 (for example, 80% or more of the length in the axial direction) is positioned inside the piston 15. It is As a reminder, the cavity need not be sealed, and may be open to the atmosphere, for example.
- the axial (physical) drive limit of the piston 15 with respect to the cylinder member 13 may be set appropriately.
- the drive limit of the piston 15 on the side of the end face 13d may be defined by the piston 15 coming into contact with a stopper (not shown) provided at or near the end face 13d.
- the drive limit of the piston 15 on the side opposite to the cylinder chamber 13a may be defined by contacting the piston 15 with a stopper (not shown) provided on the cylinder member 13 or the support member 21, or by driving the conversion mechanism 19. may be defined by limits.
- the piston 15 may be restricted from rotating about its axis with respect to the cylinder member 13 .
- a key groove extending in the axial direction is formed in a portion of the piston 15 closer to the conversion mechanism 19 than the packing 33, which will be described later, and the key groove is formed in the opening 13f of the cylinder member 13 or in the vicinity thereof. Mating keys may be formed.
- a packing 33 such as an O-ring may be interposed between the cylinder member 13 and the piston 15 .
- the packing 33 improves the airtightness of the cylinder chamber 13a.
- the configuration of the packing 33 may be similar to various configurations, for example, it may be similar to a known configuration.
- the axial length of the piston 15 is shortened, and the interior of the cylinder member 13 is divided into a cylinder chamber 13a and a cylinder chamber located on the opposite side of the piston 15.
- a rod having a diameter smaller than that of the piston 15 may extend out from the opening 13f, and the driving force of the electric motor 9 may be transmitted to the rod.
- the opening 13f may have the same diameter as shown in the drawing, or may have the same diameter as the rod.
- the cylinder chamber on the rod side may not be used. From another point of view, the cylinder chamber on the rod side may be open to the atmosphere.
- the piston 15 and the conversion mechanism 19 may be arranged coaxially in series instead of being concentric.
- the shape, size, material, etc. of the support member 21 are arbitrary.
- the support member 21 has a side portion 21a connected in series with the cylinder member 13 in the axial direction, and an end portion 21b located on the side opposite to the cylinder member 13 of the side portion 21a. have.
- the space accommodating the conversion mechanism 19 and the like of the support member 21 does not need to be sealed, and may be open to the atmosphere, for example.
- the side portion 21 a is, for example, a cylindrical member (having a cross-sectional shape that is not necessarily circular) that surrounds the conversion mechanism 19 around its axis, or is arranged around the axis of the conversion mechanism 19 so as to extend in the axial direction of the conversion mechanism 19 . may be configured by a plurality of rods extending to the The side portion 21a contributes to fixing the cylinder member 13 and the end portion 21b, for example. Also, the side portion 21 a may contribute to protection of the piston 15 and/or the conversion mechanism 19 .
- the end portion 21b is configured by, for example, a plate-like member facing the axial direction of the conversion mechanism 19.
- the end portion 21 b directly supports the electric motor 9 , the transmission mechanism 17 and the conversion mechanism 19 .
- the body portion (stator) of the electric motor 9 is fixed to the surface of the end portion 21b on the cylinder member 13 side.
- the screw shaft 29 is supported by the end portion 21b via bearings. End 21 b may contribute to supporting piston 15 via conversion mechanism 19 .
- the gas circuit 7 has a plurality of flow paths.
- the plurality of channels includes, for example, the following channels.
- An upstream flow path 35 for supplying gas from the tank 3 to the cylinder chamber 13a.
- a downstream flow path 37 for supplying gas from the cylinder chamber 13 a to the gas chamber 109 a of the accumulator 103 .
- a return channel 39 for discharging gas from the gas chamber 109 a to the tank 3 .
- a part of the upstream channel 35 and the return channel 39 are shared on the tank 3 side. One end of this shared portion constitutes a first port 41 connected to the tank 3 . It should be noted that, unlike the illustrated example, it is also possible to connect the upstream flow path 35 and the return flow path 39 to the tank 3 separately without sharing them.
- the downstream channel 37 and the return channel 39 share a part on the accumulator 103 side. One end of this shared portion constitutes a second port 43 connected to the accumulator 103 . It should be noted that unlike the illustrated example, the downstream flow path 37 and the return flow path 39 can be connected to the accumulator 103 separately without being made common.
- each channel may be constituted by pipes, blocks or hoses.
- the member forming the flow path may be a rigid body (pipe or block) or a flexible body (hose).
- the first port 41 may or may not be assumed to be detachable from the tank 3.
- the second port 43 may or may not be detachable from the accumulator 103 .
- the above description of the port of the tank 3 may be used or may be inferred from the description.
- the boundary between the two is not necessarily clear, and the first port 41 is not uniquely defined.
- an arbitrary position between the compression section 5 and the tank 3 may be regarded as the first port 41 .
- any position between the compression section 5 and the accumulator 103 may be regarded as the second port 43 .
- a stop valve 45 (described later) near the accumulator 103 is regarded as an external element of the supply device 1 , and the connecting position between the stop valve 45 and the gas circuit 7 is indicated by the second port 43 .
- the stop valve 45 may be regarded as part of the gas circuit 7 and the position closer to the accumulator 103 than the stop valve 45 may be regarded as the second port 43 .
- the configurations of the first port 41 and the second port 43 are arbitrary.
- these ports may simply be openings at one end of a flow path.
- these ports may be caps of stop valves.
- the gas circuit 7 has a plurality of valves located in the plurality of flow paths. Specifically, it is as follows.
- the gas circuit 7 has an upstream check valve 47 positioned in the upstream flow path 35 and a downstream check valve 49 positioned in the downstream flow path 37 . More specifically, the upstream check valve 47 is located in a portion of the upstream flow path 35 that is not shared with the return flow path 39 . Further, the downstream check valve 49 is positioned in a portion of the downstream flow path 37 that is not shared with the return flow path 39 .
- the upstream check valve 47 permits flow from the first port 41 (tank 3) to the cylinder chamber 13a and prohibits flow in the opposite direction.
- the downstream check valve 49 permits flow from the cylinder chamber 13a to the second port 43 (accumulator 103) and prohibits flow in the opposite direction.
- check valves may be various, and may be similar to known configurations, for example.
- the check valve may have a spring that urges the valve body in the direction to open the flow path and is closed by the pressure of the gas that inhibits the flow, or conversely, the spring closes the flow path. It may be opened by the pressure of the gas that biases the valve body in the direction and allows the flow.
- the check valve may be configured so that no pilot pressure is introduced for the opening operation and/or closing operation (example shown), or may be configured so that pilot pressure is introduced. .
- check valve is taken as an example here, other types of valves may be used.
- a switching valve whose valve body is driven by a solenoid may be used.
- the switching valve is opened, and when the flow in the opposite direction should be prohibited, the switching valve is switched.
- Control may be provided by the controller 105 to close the valve.
- the gas circuit 7 has a supply control valve 51 located in the downstream channel 37 and a return control valve 53 located in the return channel 39 . More specifically, the supply control valve 51 is positioned in a portion of the downstream flow path 37 that is not shared with the return flow path 39, and is positioned closer to the accumulator 103 than the downstream check valve 49. there is also, the return control valve 53 is positioned in a portion of the return flow path 39 that is not shared with the downstream flow path 37 . These control valves open and close the flow paths according to control signals from the control device 105 .
- control valves may be an appropriate configuration as long as the flow path can be opened and closed.
- these control valves may have their valve bodies driven directly by solenoids (not by pilot pressure). In this case, control responsiveness is improved, and the pressure of the accumulator 103 can be adjusted with high accuracy.
- the control valve may utilize pilot pressure instead of or in addition to the solenoid.
- the control valve comprises a two-port, two-position switching valve whose valve disc is biased to the closed position by a spring and biased to the open position by a solenoid (independent of pilot pressure). ing.
- the control valve may be composed of a check valve or a flow control valve.
- an orifice may be provided to reduce the cross-sectional area of the flow path.
- an orifice for example, the decrease in pressure of the accumulator 103 when discharging gas from the accumulator 103 to the tank 3 can be moderated, and the accuracy of adjusting the pressure of the accumulator 103 can be improved. can.
- the gas circuit 7 may have any suitable number of stop valves (45, 55 and 57) at any suitable location.
- a stop valve is a valve that is manually opened and closed. In this embodiment, the stop valve is basically open during operation of the molding machine 101 .
- the stop valves serve, for example, to inhibit gas flow when maintenance of the molding machine 101, assembly of the molding machine 101, or dismantling of the molding machine 101 is performed.
- FIG. 1 the following stop valves are illustrated.
- a stop valve 55 positioned closer to the tank 3 than the upstream check valve 47 in the upstream flow path 35 (more specifically, a portion not shared with the return flow path 39).
- a stop valve 57 located between the downstream check valve 49 and the supply control valve 51 in the downstream flow path 37 (more specifically, the portion not shared with the return flow path 39).
- a stop valve 45 forming a port connected to the second port 43 of the accumulator 103 .
- the stop valve 45 may be regarded as being provided in the accumulator 103, or as being provided in the gas circuit 7. good too.
- the gas circuit 7 may have a suitable number of safety valves (59 and 61) at suitable positions.
- the safety valve opens and discharges the gas when the pressure of the gas reaches a predetermined set pressure.
- FIG. 1 illustrates a safety valve 59 connected to the tank 3 and a safety valve 61 connected to the accumulator 103 .
- the specific configurations of these safety valves may be various, and may be similar to known configurations, for example. Also, the set pressure at which these safety valves are opened may be set as appropriate.
- the safety valve 59 may be regarded as being provided in the tank 3 or as a component of the gas circuit 7 .
- the safety valve 61 may be regarded as provided in the accumulator 103 or as a component of the gas circuit 7 .
- the control device 105 may include, for example, a computer (not shown).
- the computer may include, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an external storage device (not shown).
- Various functional units that perform various calculations (including control) are constructed by the CPU executing programs stored in the ROM and/or the external storage device.
- the control device 105 may include a logic circuit that performs a certain operation, may include a power supply circuit, or may be conceptualized including a driver.
- the control device 105 may be integrated in one place in terms of hardware, or may be distributed in a plurality of places.
- control device 105 Under the control of the control device 105, for example, a series of operations (molding cycle) for producing a molded product by the molding machine 101 are repeated. Also, the control device 105 controls the supply device 1 . Specifically, the control device 105 controls the electric motor 9 and various valves (the supply control valve 51 and the return control valve 53 in the illustrated example) of the gas circuit 7 .
- the supply device 1 may have various sensors. Detected values of various sensors may be input to the control device 105 and used by the control device 105 to control the supply device 1 (molding machine 101).
- the supply device 1 may have a tank pressure sensor 63 that detects the pressure of the tank 3 and an ACC pressure sensor 65 that detects the pressure of the accumulator 103 .
- these pressure sensors are regarded as constituent elements of the supply device 1 .
- these pressure sensors may be regarded as external components of the supply device 1 .
- the tank pressure sensor 63 is typically provided in the tank 3 to detect the pressure of the gas inside the tank 3, as in the illustrated example. However, the tank pressure sensor 63 only needs to be able to detect a pressure equivalent to the pressure in the tank 3 while the molding machine 101 is in operation. Therefore, for example, the tank pressure sensor 63 may detect the pressure of the flow path outside the tank 3 . Specifically, in the illustrated example, for example, the tank pressure sensor 63 may be provided at an appropriate position between the upstream check valve 47 and the first port 41 in the upstream flow path 35 . For this reason, for example, the description of the present disclosure may refer to the pressure of the first port 41 and the pressure of the tank 3 without distinguishing between them.
- the ACC pressure sensor 65 is typically provided in the accumulator 103 to detect the pressure in the gas chamber 109a, as in the illustrated example.
- the ACC pressure sensor 65 only needs to detect a pressure equivalent to the pressure in the gas chamber 109a while the molding machine 101 is in operation. Therefore, for example, the ACC pressure sensor 65 may detect the pressure in the flow path of the supply device 1.
- the ACC pressure sensor 65 is used, for example, by the control device 105 or an operator in the operation of adjusting the pressure of the accumulator 103 by the supply device 1, as will be described later. Also, the ACC pressure sensor 65 and/or the tank pressure sensor 63 may be used to detect any abnormality by monitoring the detected values thereof by the controller 105 and/or the operator.
- the supply device 1 may have a sensor for detecting the position of the piston 15 with respect to the cylinder member 13.
- a first limit switch 67 and a second limit switch 69 are illustrated as such sensors. These limit switches are turned on to output a signal (or turned off to stop outputting a signal) when a part of the piston 15 (the upper flange portion of the piston 15 in the illustrated example) comes into contact.
- the first limit switch 67 is turned ON when the piston 15 is positioned at or slightly before the drive limit on the side opposite to the cylinder chamber 13a.
- the second limit switch 69 is turned ON when the piston 15 is positioned at or slightly before the drive limit on the cylinder chamber 13a side. Therefore, for example, the control device 105 can determine whether or not it is necessary to change the moving direction of the piston 15 (the rotating direction of the electric motor 9) based on the signals from these limit switches.
- the sensor for detecting the position of the piston 15 with respect to the cylinder member 13 may be of another type.
- a non-contact sensor that detects when the piston 15 is at its drive limit may be used, or a linear encoder or laser length measuring device that can detect any position of the piston 15 may be used.
- the position of the piston 15 can also be detected by detecting the amount of rotation of the electric motor 9 .
- FIG. 2 is a graph for explaining the operation of adjusting the pressure of the accumulator 103.
- the horizontal axis t indicates time.
- the vertical axis P indicates pressure.
- Various lines in the figure indicate changes in the pressure of the accumulator 103 over time. However, pressure fluctuations in the accumulator 103 (pressure fluctuations within one cycle) due to the supply of hydraulic fluid from the accumulator 103 to the drive unit of the molding machine 101 are ignored.
- line L1 indicates the change over time in the pressure of accumulator 103 when the pressure of accumulator 103 is regulated.
- a line L2 indicates the change over time of the pressure in the accumulator 103 when the pressure in the accumulator 103 is not regulated.
- the pressure of the accumulator 103 is the target pressure Pt0 at time t0.
- the temperature of the gas and/or hydraulic fluid contained in the accumulator 103 rises. To go.
- the pressure in the accumulator 103 increases as indicated by line L2. Therefore, by opening the return control valve 53 to release the gas from the accumulator 103 to the tank 3, the pressure of the accumulator 103 can be brought to the target pressure Pt0 as indicated by the line L1.
- adjustment to increase the pressure of the accumulator 103 is also made at an appropriate time, contrary to the above.
- the compression unit 5 is driven to supply gas from the tank 3 to the gas chamber 109a so that the pressure of the accumulator 103 reaches the target pressure.
- the pressure may be adjusted to Pt0. and/or, when the pressure of the accumulator 103 becomes lower than the target pressure Pt0 due to a decrease in the ambient temperature of the molding machine 101, the compression unit 5 supplies gas from the tank 3 to the gas chamber 109a, The pressure of the accumulator 103 may be adjusted to the target pressure Pt0.
- the target pressure of the accumulator 103 is changed to a target pressure PtH higher than the target pressure Pt0 or a target pressure PtL lower than the target pressure Pt0 at time t1.
- the pressure of the accumulator 103 may determine the pressure applied to the molding material in the mold, as will be understood from the description below. This pressure then affects the quality of the molded product.
- the target pressure of the accumulator 103 is changed by the operator and/or controller 105 in response to mold changes or depending on the quality of the molded product.
- the compressor 5 When the target pressure is changed from the target pressure Pt0 to the target pressure PtH, the compressor 5 is driven to supply gas from the tank 3 to the gas chamber 109a, and the pressure of the accumulator 103 is adjusted to the target pressure PtH.
- the return control valve 53 When the target pressure is changed from the target pressure Pt0 to the target pressure PtL, the return control valve 53 is opened to release the gas from the gas chamber 109a to the tank 3 to adjust the pressure of the accumulator 103 to the target pressure PtL.
- the supply of gas to the accumulator 103 and/or the discharge of gas from the accumulator 103 described above is performed by, for example, the control device 105 based on the detection value of the ACC pressure sensor 65. It may be realized by controlling a control valve 51 and a return control valve 53). However, for example, the operator may control the supply device 1 by operating the input device while viewing the detected value of the ACC pressure sensor 65 displayed on the display device to supply and/or discharge the gas. do not have.
- this control may be performed, for example, over the entire period during which the molding machine 101 is in operation, or may be performed during a specific period. and may end when the target pressure is obtained.
- Specific timings include, for example, the following. The timing at which the operator instructs the control device 105 to adjust the pressure of the accumulator 103 by operating the input device. The timing when the operation of the molding machine 101 is started. The timing at which the target pressure was set or changed.
- FIG. 3 is a flow chart showing an example of a procedure of processing executed by the control device 105 to implement the operation described with reference to FIG.
- This process is started, for example, when the molding machine 101 starts operating, or at the specific timing described above.
- the electric motor 9 is stopped and the supply control valve 51 and the return control valve 53 are closed.
- the piston 15 is positioned, for example, at a position (driving limit) where the volume of the cylinder chamber 13a is maximized.
- the piston 15 may be positioned closer to the cylinder chamber 13a than the drive limit.
- control device 105 determines whether or not pressure Pa detected by ACC pressure sensor 65 is lower than threshold PL .
- the threshold P L is the target pressure (Pt0, PtL or PtH) minus an allowable error.
- the control device 105 proceeds to step ST2, and when the determination is negative, the control device 105 skips step ST2 and proceeds to step ST3.
- step ST2 the control device 105 controls the supply device 1 to supply gas from the supply device 1 to the accumulator 103. Specifically, the control device 105 opens the supply control valve 51 and drives the electric motor 9 to move the piston 15 toward the cylinder chamber 13a. By supplying gas to the accumulator 103, the pressure of the accumulator 103 rises and approaches the target pressure.
- step ST2 When step ST2 is executed, the control device 105 skips steps ST3 and ST4 and proceeds to step ST5.
- the control device 105 determines whether or not the pressure Pa detected by the ACC pressure sensor 65 is higher than the threshold value PH .
- the threshold PH is the target pressure (Pt0, PtL or PtH ) plus an allowable error.
- the control device 105 proceeds to step ST4, and when the determination is negative, the control device 105 skips step ST4.
- step ST4 the control device 105 controls the supply device 1 to discharge the gas from the accumulator 103 to the supply device 1. Specifically, controller 105 opens return control valve 53 . As the gas is discharged from the accumulator 103, the pressure of the accumulator 103 decreases and approaches the target pressure.
- the control device 105 determines whether or not the conditions for terminating the processing shown in FIG. 3 are satisfied.
- the termination condition may be, for example, that an instruction to stop the operation of the molding machine 101 has been issued, or that the target pressure has been obtained.
- the fact that the target pressure is obtained may be the fact that the difference between the detected pressure Pa and the target pressure has become equal to or less than a predetermined value.
- control device 105 may control the electric motor 9 to move the piston 15 toward the cylinder chamber 13a by a predetermined movement amount. Further, for example, the control device 105 may drive the electric motor 9 so as to move the piston 15 toward the cylinder chamber 13a by a movement amount corresponding to the deviation between the detected pressure Pa and the target pressure. Also, for example, the control device 105 monitors the detected pressure Pa of the ACC pressure sensor 65, and until the detected pressure Pa reaches a predetermined pressure (for example, the target pressure or the pressure between the target pressure and the threshold PL ), The driving of the electric motor 9 may be continued.
- a predetermined pressure for example, the target pressure or the pressure between the target pressure and the threshold PL
- the predetermined amount of movement of the piston 15 may be, for example, a distance equal to or less than the distance by which the piston 15 moves from the drive limit on the side opposite to the cylinder chamber 13a to the drive limit on the cylinder chamber 13a side. , may be more than twice the above distance. That is, in step ST2, the piston 15 may move toward the cylinder chamber 13a only once, or may move toward the cylinder chamber 13a two or more times (from another point of view, more than one reciprocation). may move).
- the amount of movement according to the deviation or the amount of movement until the predetermined pressure is obtained may be less than or equal to the one-way distance or more than twice the one-way distance.
- the movement amount according to the deviation may be provided with an upper limit value, and in this case, the upper limit value may be a one-way distance.
- step ST4 specific control of the control device 105 may be made as appropriate.
- controller 105 may open return control valve 53 for a predetermined length of time.
- the control device 105 may open the return control valve 53 for a length of time according to the deviation between the detected pressure Pa and the target pressure.
- the control device 105 monitors the detected pressure Pa of the ACC pressure sensor 65, and until the detected pressure Pa reaches a predetermined pressure (for example, the target pressure or a pressure between the target pressure and the threshold value PH ), The operation of opening the return control valve 53 may be continued.
- a predetermined pressure for example, the target pressure or a pressure between the target pressure and the threshold value PH
- steps ST1 and ST2 and steps ST3 and ST4 may be reversed.
- a step of monitoring the pressure detected by the tank pressure sensor 63 and/or the ACC pressure sensor 65 to detect an abnormality may be inserted.
- the supply device 1 supplies gas to the accumulator 103 by applying the driving force of the electric motor 9 to the gas without using the hydraulic fluid.
- the pressure setting range can be widened, the accumulator 103 (attached gas accumulator) can be made smaller, and the pressure can be reduced. It is possible to improve the accuracy of adjustment and reduce wasted gas.
- the effect will be described with reference to comparative examples and modified examples.
- FIG. 4(a) is a schematic diagram showing a gas supply mode according to a comparative example.
- a gas accumulator 115A communicating with the gas chamber 109a of the accumulator 103 is provided.
- tank 3A containing gas at a pressure higher than the pressure of the accumulators is connected. Gas is supplied from the tank 3A to the accumulator due to the pressure difference between the accumulator and the tank 3A.
- the pressure in the tank 3A decreases and the pressure in the accumulators (103 and 115A) increases.
- both pressures become equal, the supply of gas from the tank 3A to the accumulator is terminated. Then, the tank 3A connected to the accumulator is replaced with a new tank 3A and the same operation is repeated until the pressure of the accumulator reaches the desired pressure.
- the gas supply from the tank 3 to the accumulator 103 is stopped by closing the valve between the accumulator and the tank 3A. That is, gas filling is completed.
- the hydraulic fluid is supplied from the pump 117 to the gas accumulator 115A.
- the pressure of the accumulator 103 rises.
- the pressure of the accumulator 103 reaches the target pressure (for example Pt0).
- FIG. 4(b) is a schematic diagram showing a gas supply mode according to a modification of the embodiment.
- the modified example has a configuration in which the supply device 1 is interposed between the auxiliary tank 115B corresponding to the gas accumulator 115A and the tank 3A in the comparative example.
- the tank 3A is arranged in place of the tank 3 in FIG. 1 and is connected to the first port 41. In FIG. 1 the tank 3A is shown as an external element of the supply device 1. In FIG.
- the gas in the tank 3A is compressed by the supply device 1 even after the pressure in the tank 3A has decreased to the same level as the pressure in the accumulator 103. It can be fed to the accumulator 103 .
- the pressure of the accumulator 103 can be adjusted by selectively supplying and discharging gas.
- the tank 3A may be used as the tank 3 of the embodiment as long as the pressure is lowered to some extent.
- the tank 3 of the embodiment may be connected instead of the tank 3A.
- the tank 3A when the pressure of the tank 3A drops to the same level as the pressure of the accumulator 103, the tank 3A is replaced with a new tank 3A. Therefore, in the previously used tank 3A, gas remains at a pressure equivalent to the pressure of the accumulator 103 at the time of replacement. That is, gas is wasted. In particular, the later connected tank 3A has a higher pressure when it is removed, and thus more nitrogen is wasted.
- the gas in the tank 3A can be supplied to the accumulator 103 even after the pressure in the tank 3A has decreased to the same level as the pressure in the accumulator 103 as described above.
- gas in tank 3A can be supplied to accumulator 103 until the pressure in tank 3A is as great as atmospheric pressure. As a result, no gas is wasted.
- the applicant's trial calculation for example, when 20 tanks 3A are required in the comparative example, only 4 tanks 3A are required in the modified example.
- the amount of pressure adjustment in the accumulator 103 correlates with the amount of working fluid supplied to the gas accumulator 115A. From another point of view, the range in which the pressure can be adjusted is limited by the volume of gas accumulator 115A. As a result, the range in which the pressure can be adjusted is narrowed and/or the gas accumulator 115A is enlarged.
- the pressure of the accumulator 103 is adjusted by supplying gas to the accumulator 103 . Therefore, the pressure adjustment range is not limited by the volume of the gas accumulator 115A, but is defined by the performance of the compression section 5. Therefore, it is easy to widen the range in which the pressure can be adjusted. From another point of view, the size of the auxiliary tank 115B according to the modification can be reduced, or the auxiliary tank 115B can be eliminated as in the embodiment.
- the comparative example a sensor or the like for detecting the liquid level of the gas accumulator 115A is required.
- the comparative example has an increased size and/or increased cost associated with the accumulators (103 and 115A).
- such inconvenience does not occur.
- the supply device 1 has been described as part of the molding machine 101 .
- the supply device may be constructed as a device that can be attached to and detached from a molding machine that needs to be filled with gas.
- the feeding device may be utilized in multiple molding machines in sequence.
- the supply device may be a device that is not owned by the owner of the molding machine, but is rented to the owner of the molding machine. In such a case, if the configuration of the accumulator is reduced in size and/or the cost is reduced by reducing the size or eliminating the auxiliary tank 115B and eliminating the liquid level sensor as described above, the molding machine can be reduced in size and/or. Or cost reduction will be achieved.
- the accuracy of the amount of pressure adjustment in the accumulators (103 and 115A) is determined by the accuracy of the amount of hydraulic fluid supplied to or discharged from the gas accumulator 115A.
- the accuracy of the supply or discharge of hydraulic fluid is relatively low. As a result, the accuracy of the pressure adjustment amount is lowered.
- the electric motor 9 adjusts the pressure.
- the accuracy of control of the electric motor 9 is high. Therefore, it is easy to increase the accuracy of the pressure adjustment amount.
- embodiments may be used to obtain arbitrary pressure by positioning the piston 15 with high precision and/or moving the piston 15 at a slow speed while monitoring the sensed pressure.
- the hydraulic system including pump 117 and control valve 121 also supplies hydraulic fluid to various drive units of the molding machine, for example.
- the pressure of the accumulator 103 is adjusted by supplying the working fluid to the gas accumulator 115A or discharging the working fluid from the gas accumulator 115A while the molding machine is in operation, the operation directly related to molding Fluctuations in the pressure of the hydraulic fluid for can affect regulation of the accumulator 103 pressure. Also, the opposite effect can occur.
- the pressure of the accumulator 103 is adjusted by supplying gas to or discharging gas from the accumulator 103, so the above problems are eliminated.
- the supply device 1 may have a first port 41, a second port 43, a housing member (cylinder member 13), and a movable member (piston 15).
- a first port 41 may be connected to the tank 3 .
- a second port 43 may be connected to the accumulator 103 .
- the cylinder member 13 may have at least one space (cylinder chamber 13 a ) communicating with the first port 41 and the second port 43 .
- the piston 15 may compress the gas within the cylinder chamber 13 a by moving within the cylinder member 13 .
- the electric motor 9 may be connected to the piston 15 .
- the embodiment facilitates miniaturization of, for example, members driven by the electric motor 9 . Further, the positions of the first port 41 and the second port 43 are fixed, which facilitates the design of the gas flow path.
- the housing member may be a cylinder member 13 having a first cylinder chamber (cylinder chamber 13a) as at least one space.
- the movable member may be a piston 15 that changes the volume of the cylinder chamber 13a by moving in the cylinder member 13 in the axial direction.
- the movable member compared to a compression unit having a case as a housing member and a fan as a movable member that rotates in the case (this configuration may also be included in the technology according to the present disclosure), the movable member
- the relationship between the movement amount of (the piston 15) and the gas supply amount (compression amount) is clear. Therefore, for example, it is easy to improve the accuracy of pressure adjustment.
- the accumulator 103 that is not filled with gas for example, has a pressure equivalent to atmospheric pressure
- the amount of movement of the piston 15 that causes the pressure in the tank 3A to become equivalent to atmospheric pressure and/or Alternatively, it is easy to calculate the amount of movement of the piston 15 to bring the accumulator 103 to the desired pressure.
- the replacement timing of the tank 3A and/or the filling completion time of the accumulator 103 can be calculated in advance and notified to the operator.
- the cylinder member 13 may have only the first cylinder chamber (cylinder chamber 13a) as the cylinder chamber communicating with the first port 41 and the second port 43.
- the configuration (packing 33, etc.) for sealing the gas-enclosed space (cylinder chamber) can be reduced compared to the second embodiment described later. From another point of view, there is little gas leakage. As a result, for example, the replenishment amount of gas can be reduced. Also, compared to the second embodiment, it is easier to reduce the size of the compressed portion.
- the supply device 1 may have an upstream check valve 47 and a downstream check valve 49 .
- the upstream check valve 47 may allow the flow from the first port 41 to the cylinder chamber 13a and prohibit the flow in the opposite direction.
- the downstream check valve 49 may allow flow from the cylinder chamber 13a to the second port 43 and prohibit flow in the opposite direction.
- the supply device 1 may have a return flow path 39 and a return control valve 53 .
- the return flow path 39 may connect the first port 41 and the second port 43 while avoiding all of the at least one space (cylinder chamber 13a).
- a return control valve 53 may open and close the return flow path 39 .
- the supply device 1 may have an ACC pressure sensor 65 and a control device 105 .
- the ACC pressure sensor 65 may detect the pressure of gas at the second port 43 (in another respect the accumulator 103).
- the control device 105 compresses the gas by the electric motor 9 and supplies it to the accumulator 103 when the ACC pressure sensor 65 is lower than the target pressure (for example, Pt0, PtH or PtL. More precisely, P L in the example of FIG. 3).
- the electric motor 9 and the return control valve 53 may be controlled as follows (steps ST1 and ST2).
- the control device 105 also controls the accumulator 103 via the return flow path 39 when the ACC pressure sensor 65 is higher than the target pressure (for example, Pt0, PtH or PtL; more precisely, P H in the example of FIG. 3).
- the electric motor 9 and the return control valve 53 may be controlled to release gas to the 1 port 41 (steps ST3 and ST4).
- the supply device 1 can be used not only for supplying gas to the accumulator 103 but also for discharging gas from the accumulator 103 . That is, the supply device 1 can both increase and decrease the pressure of the accumulator 103 .
- the upstream check valve 47 and the downstream check valve 49 are operated as pilots. It would have to be configured to be opened by pressure, but eliminates the need for such.
- the return flow path 39 may be used to supply gas from the tank 3A to the accumulator 103 when the pressure of the tank 3A in the modified example is higher than the pressure of the accumulator 103 .
- FIG. 5 is a schematic diagram showing the configuration of the supply device 201 (molding machine 101A) according to the second embodiment, and corresponds to FIG.
- the supply device 201 may be used to fill the gas chamber 109a, which is not filled with gas (for example, has a pressure equivalent to the atmospheric pressure), or may be used to fill the gas chamber 109a with gas. may be used to adjust the pressure of the gas chamber 109a filled with .
- gas chamber 109a which is not filled with gas (for example, has a pressure equivalent to the atmospheric pressure)
- gas chamber 109a may be used to fill the gas chamber 109a with gas.
- an aspect used for filling gas is taken as an example.
- the supply device 201 differs from the first embodiment in two respects.
- the compression cylinder 211 has two cylinder chambers (213a and 213b), and the gas can be compressed in both the forward and backward movements of the piston 15. It is a point to be done.
- the supply device 201 is assumed to be used for filling gas (not used for adjusting pressure), and this is the difference. . Specifically, it is as follows.
- the compression section 205 of the second embodiment differs from the compression section 5 of the first embodiment in the configuration of the compression cylinder.
- the piston 215 has, for example, a piston body 215a and first and second rods 215b and 215c extending axially from the piston body 215a.
- the piston body 215a has the same shape and dimensions as the inner surface of the cylinder member 213 in a cross section perpendicular to the axial direction. That is, the piston main body 215a is accommodated in the cylinder member 213 so as to be slidable inside the cylinder member 213 .
- the piston body 215a divides the interior of the cylinder member 213 into a first cylinder chamber 213a on one side in the axial direction (lower side in FIG. 5) and a second cylinder chamber 213b on the opposite side.
- the piston body 215a compresses the gas in the first cylinder chamber 213a and supplies it to the accumulator 103, while supplying the gas from the tank 3A to the second cylinder chamber 213b. can accept.
- the piston body 215a compresses the gas in the second cylinder chamber 213b and supplies it to the accumulator 103, while supplying the gas from the tank 3A to the first cylinder chamber 213a. can be accepted.
- the second rod 215c extends from the piston body 215a toward the conversion mechanism 19 side.
- the second rod 215c has a smaller diameter than the piston body 215a.
- a second cylinder chamber 213b is formed on the conversion mechanism 19 side of the cylinder member 213 .
- the cylinder member 213 has an end face portion 213e located on the conversion mechanism 19 side.
- the end surface portion 213e has an opening 213f.
- the second rod 215c extends out of the cylinder member 213 through the opening 213f and contributes to the connection between the piston 215 and the conversion mechanism 19. As shown in FIG.
- the second rod 215c is configured to accommodate most of the conversion mechanism 19, similar to the piston 15 of the first embodiment.
- the diameter of the second rod 215c and the diameter of the opening 213f are drawn in the same manner as the diameter of the piston 15 and the diameter of the opening 13f in the first embodiment.
- the piston main body 215a has a configuration that is obtained by expanding a portion of the piston 15 of the first embodiment.
- the cylinder member 213 also has a configuration in which the diameter of the cylinder member 13 of the first embodiment is increased.
- the absolute diameters of the second rod 215c and the piston body 215a or the relative diameters with respect to the conversion mechanism 19 are arbitrary.
- the piston and the conversion mechanism do not have to be provided concentrically, and the conversion mechanism has a configuration (for example, a link mechanism) that is difficult to provide concentrically with the piston.
- the first rod 215b may not be provided.
- the first rod 215b contributes, for example, to equalizing the area of the cross section of the first cylinder chamber 213a (the cross section orthogonal to the axial direction) and the area of the cross section of the second cylinder chamber 213b. Since the two areas are equal, for example, when the piston 15 is not driven, the gas pressure from the tank 3 does not act as a force to drive the piston 15 to one side in the axial direction. As a result, the probability that the driving force required for the electric motor 9 to increase when the electric motor 9 drives the piston 15 to the other side in the axial direction is reduced. Further, for example, the amount of gas compression with respect to the movement distance of the piston 15 in the forward path becomes the same as the amount of gas compression with respect to the movement distance of the piston 15 in the return path, so that the control of the compression unit 205 is facilitated.
- the first rod 215b extends from the piston body 215a to the side opposite to the conversion mechanism 19 (downward in FIG. 5).
- the first rod 215b has a smaller diameter than the piston body 215a. More specifically, for example, the diameter of the first rod 215b is the same as the diameter of the second rod 215c.
- the cylinder member 213 has an end face portion 213 d located on the opposite side of the conversion mechanism 19 .
- the end face portion 213d has an opening 213h.
- the first rod 215b extends out of the cylinder member 213 through the opening 213h. With such a configuration, the first cylinder chamber 213a having the same cross-sectional area as the cross-sectional area of the second cylinder chamber 213b is formed.
- a packing 33 may be provided between the piston body 215a and the inner surface of the cylinder member 213, as in the first embodiment. In the second embodiment, packings 33 may be further provided between the first rod 215b and the inner surface of the opening 213h and between the second rod 215c and the opening 213f.
- the gas circuit 207 has two each of some of the components of the gas circuit 7 of the first embodiment, corresponding to the fact that the compression section 205 has two cylinder chambers.
- a first upstream flow path 35A, a first A first downstream flow path 37A, a first upstream check valve 47A and a first downstream check valve 49A are provided.
- a second upstream flow path 35B, a second downstream flow path 37B, a second upstream check valve 47B and a second Two downstream check valves 49B are provided.
- the configuration and operation of the upstream flow path 35, the downstream flow path 37, the upstream check valve 47, the downstream check valve 49, and the cylinder chamber 13a in the first embodiment are described in the first upstream flow path 35A, the first downstream flow path 37A, the first upstream check valve 47A, the first downstream check valve 49A, and the first cylinder chamber 213a.
- the description of the configuration and operation of the flow passages, valves, and cylinder chamber 13a in the first embodiment includes the second upstream flow passage 35B, the second downstream flow passage 37B, the second upstream check valve 47B, and the second downstream flow passage 35B.
- the check valve 49B and the configuration and operation of the second cylinder chamber 213b may be incorporated as appropriate.
- first upstream flow path 35A and the second upstream flow path 35B are partly shared on the first port 41 side, for example.
- a portion of the first downstream flow path 37A and the second downstream flow path 37B are shared on the second port 43 side.
- the supply device used for gas charging may be a device connected to the molding machine as needed. It may be regarded as an external device. However, in FIG. 5, the supply device 201 is shown as part of the molding machine 101A for convenience. In the following description, the supply device 201 may be referred to as part of the molding machine 101A or as a device external to the molding machine 101A.
- the supply device 201 may be portable. That is, the supply device 201 may be configured to be easily movable.
- the feeding device 201 may have casters 75 (shown in dashed lines) that provide support for the feeding device 201 .
- the supply device for example, the first embodiment
- the supply device used for adjusting the pressure may also be made portable by having casters or the like.
- the gas circuit 207 of the second embodiment does not have the configuration for adjusting the gas pressure of the first embodiment. That is, the gas circuit 207 is not provided with the return flow path 39, the return control valve 53, and the supply control valve 51 of the first embodiment.
- FIG. 5 illustrates a connection mode between the tank 3A and the gas circuit 207, which is different from that in FIG.
- the gas circuit 207 has the first port 41 at or near the base of the stop valve 55 .
- the first port 41 and a port (reference numeral omitted) of the tank 3A are connected to each other by a connecting member 123B.
- FIG. 5 illustrates a different aspect from FIG. 1 regarding the connection aspect of the accumulator 103 and the gas circuit.
- the gas circuit 207 has the second port 43 at or near the mouthpiece of the stop valve 57 .
- the second port 43 and the stop valve 45 of the accumulator 103 are connected to each other by a connecting member 123A.
- connection members 123A and 123B have, for example, a flow path partly or wholly constituted by pipes and/or hoses and attachment/detachment parts located at both ends thereof, although no particular reference numerals are attached.
- the attachment/detachment part has a configuration corresponding to the attachment/detachment part described in the description of the tank 3, for example.
- the various sensors and valves shown in the first embodiment are replaced by the tank 3B being replaced and the supply device 201 being connected to the molding machine as needed. It may be provided in a different position than in one embodiment.
- the tank pressure sensor 63 is positioned not in the tank 3B but in the upstream flow path (35B, etc.). As a result, even if the tank 3B is replaced, the same detection value of the tank pressure sensor 63 can be used. A more specific position of the tank pressure sensor 63 is arbitrary. It can be part.
- the ACC pressure sensor 65 is located not in the accumulator 103 but in the downstream flow path (37B, etc.). As a result, the same detection value of the ACC pressure sensor can be used even when connected to various molding machines. A more specific position of the ACC pressure sensor 65 is arbitrary. There may be.
- the safety valve 61 is located not in the accumulator 103 but in the downstream flow path (37B, etc.). This allows excess pressure in the accumulator 103 to escape when connected to various molding machines.
- a more specific position of the safety valve 61 is arbitrary, for example, it may be either the first downstream flow path 37A or the second downstream flow path 37B (illustrated example), or a shared portion of both. good too.
- the supply device 201 may have a concentration sensor 71 that detects the concentration of gas components. As a result, for example, the probability of filling the accumulator 103 with a different type of gas (component) than the assumed type of gas is reduced. Note that the configuration related to the concentration sensor 71 may be provided in the supply device 1 of the first embodiment.
- the concentration sensor 71 may detect the component of the gas assumed to be filled in the accumulator 103 . Conversely, the concentration sensor 71 may detect a gas component that is not supposed to fill the accumulator 103 (for example, it is undesirable to fill the accumulator 103). Alternatively, both the former sensor and the latter sensor may be provided. Also, the concentration sensor 71 may be capable of detecting two or more components. In this case, the two or more components may include gas components that are supposed to fill the accumulator 103 and/or gas components that are not supposed to fill the accumulator 103. .
- the concentration sensor 71 may be used to detect the concentration of nitrogen. In this case, if the detected nitrogen concentration is lower than a predetermined threshold, it can be determined that a gas different from the assumed gas is being supplied.
- the concentration sensor 71 may be used to detect the concentration of oxygen. In this case, if the detected oxygen concentration is higher than a predetermined threshold, it can be determined that a gas different from the assumed gas is being supplied.
- the concentration sensor 71 detects both the concentration of nitrogen and the concentration of oxygen (it may be a combination of a sensor that detects the concentration of nitrogen and a sensor that detects the concentration of oxygen). I may give a hypothetical explanation.
- Concentration can be, for example, volume ratio, mass per unit volume, or amount of substance per unit volume (molarity).
- the position of the concentration sensor 71 may be any position from the first port 41 to the second port 43, for example.
- the concentration sensor 71 is positioned between the compression section 205 and the second port 43 .
- a control valve 73 may be provided between the concentration sensor 71 and the channel to connect and disconnect the two.
- FIG. 6 is a graph for explaining the operation of filling the accumulator 103 with gas, and is similar to FIG.
- a line L11 indicates the change over time of the pressure in the tank 3A.
- a line L12 indicates the change in the pressure of the accumulator 103 over time.
- the compression unit 205 is not driven, the tank 3A and the gas chamber 109a of the accumulator 103 are simply connected, and the gas is supplied to the accumulator 103 by the pressure difference between the two. Therefore, as shown from time t10 to time t11, the pressure in tank 3A gradually decreases, while the pressure in accumulator 103 increases. Then, at time t11, both pressures become equal. In addition, below, such filling may be called natural filling.
- the compression unit 205 is driven to supply the gas in the tank 3A to the accumulator 103.
- the pressure of the accumulator 103 rises and reaches the target pressure Pt0.
- the pressure in the tank 3A decreases, and reaches an appropriate level when the pressure in the accumulator 103 reaches the target pressure Pt0.
- such filling may be called compression filling.
- FIG. 7 is a flowchart showing an example of the procedure of processing executed by the control device 105 to implement the operation described with reference to FIG.
- This process is started, for example, when the operator performs a predetermined operation on the input device of the supply device 201 .
- the supply device 201 is connected to the molding machine 101A and the new tank 3A is connected to the supply device 201. Also, the electric motor 9 is stopped.
- the control device 105 starts natural filling described with reference to the period from time t10 to time t11 in FIG. Natural filling may be initiated, for example, by the controller 105 controlling a valve (not shown) provided near the stop valve 55 or 57 so that the valve is opened. Alternatively, unlike the example shown, it may be initiated by manually opening stop valves 55 and 57 or the like by the operator.
- step ST12 the control device 105 determines whether the concentration of nitrogen detected by the concentration sensor 71 (indicated by N2 in the figure) is higher than a predetermined threshold CN .
- the controller 105 proceeds to step ST13, and when the determination is negative, the controller 105 proceeds to step ST19. This reduces the probability that the accumulator 103 is filled with a different type of gas (nitrogen) from the assumed type of gas, as will be understood from the description given later.
- step ST13 the control device 105 determines whether or not the concentration of oxygen detected by the concentration sensor 71 (shown as O2 in the drawing) is lower than a predetermined threshold CO .
- the controller 105 proceeds to step ST14, and when the determination is negative, the controller 105 proceeds to step ST19. This reduces the probability that the accumulator 103 is filled with a different type of gas (nitrogen) from the assumed type of gas, as will be understood from the description given later.
- the controller 105 calculates the time until the tank 3A drops to a predetermined pressure (for example, atmospheric pressure) and/or the time until the pressure of the accumulator 103 reaches the desired pressure. Then, the control device 105 displays the calculated time on the display device. This calculation may be performed based on the pressure detected by the tank pressure sensor 63, the pressure detected by the ACC pressure sensor 65, the target pressure Pt0, the capability of the compression section 205, and the like. More specifically, the decreased value of the detected pressure of the tank pressure sensor 63 and the increased value of the detected pressure of the ACC pressure sensor 65 may be used.
- a predetermined pressure for example, atmospheric pressure
- the control device 105 displays the calculated time on the display device. This calculation may be performed based on the pressure detected by the tank pressure sensor 63, the pressure detected by the ACC pressure sensor 65, the target pressure Pt0, the capability of the compression section 205, and the like. More specifically, the decreased value of the detected pressure of the tank pressure sensor 63 and the increased value of the detected pressure
- step ST15 the controller 105 determines whether or not the detected pressure Pk of the tank pressure sensor 63 is equal to the detected pressure Pa of the ACC pressure sensor 65 (specifically, the difference between the two is within a predetermined range). It may be whether or not it is settled.) is determined. When the determination is affirmative, the control device 105 proceeds to step ST16, and when the determination is negative, the controller 105 waits (repeats step ST15) to continue natural filling.
- the control device 105 drives the compression section 205 to start compression filling. More specifically, the control device 105 controls the electric motor 9 based on signals from the first limit switch 67 and the second limit switch 69 so that the piston 215 reciprocates with a full stroke in the axial direction.
- step ST17 the controller 105 determines whether or not the pressure Pk detected by the tank pressure sensor 63 has reached the atmospheric pressure (atm) (specifically, whether or not the difference between the two falls within a predetermined range) may be.) is determined. When the determination is negative, the control device 105 proceeds to step ST18, and when the determination is positive, the control device 105 proceeds to step ST21. As a result, for example, as will be understood from the description given later, the operator is informed of the arrival of the replacement time for the tank 3A.
- the atmospheric pressure atm
- step ST18 the controller 105 determines whether or not the pressure Pa detected by the ACC pressure sensor 65 has reached the target pressure Pt (specifically, whether or not the difference between the two falls within a predetermined range). ) is determined. Then, when the determination is negative, the control device 105 returns to step ST17. Thereby, compression filling is continued.
- step ST18 the control device 105 performs processing (not shown) for ending compression filling, and ends the processing for filling gas shown in FIG.
- the control device 105 stops the electric motor 9 . This stops the supply of gas to the accumulator 103 . Backflow of gas from the accumulator 103 to the compression section 205 is prohibited by the downstream check valves (49A and 49B).
- step ST12 or ST13 If it is determined in step ST12 or ST13 that the type of gas is not what was assumed, for example, the process shown in FIG. 7 is terminated via steps ST19 and ST20.
- control device 105 executes processing for ending gas filling.
- the control device 105 may close a valve (not shown) provided near the stop valve 55 or 57 . This reduces the probability that the accumulator 103 will be filled with an unexpected gas.
- step ST20 the control device 105 performs processing for notifying the operator (warning) that the type of gas supplied to the first port 41 (here, the gas contained in the tank 3A) is not the expected type. to run.
- the control device 105 displays a predetermined image (including characters) on the display device, lights or blinks a predetermined lamp, and/or outputs a predetermined sound (including voice). good.
- step ST17 When it is determined in step ST17 that the detected pressure Pk of the tank pressure sensor 63 has reached the atmospheric pressure (atm), the control device 105 ends the processing shown in FIG. 7 via step ST21.
- the control device 105 executes processing for notifying the operator that the tank 3A needs to be replaced with a new one. For example, the control device 105 displays a predetermined image (including characters) on the display device, lights or blinks a predetermined lamp, and/or outputs a predetermined sound (including voice). good.
- a predetermined image including characters
- the control device 105 displays a predetermined image (including characters) on the display device, lights or blinks a predetermined lamp, and/or outputs a predetermined sound (including voice). good.
- the pressure Pk of the tank 3A may be lower than the pressure Pa of the accumulator 103 at the start of natural filling, and natural filling may not be performed substantially. obtain.
- the target pressure Pt may be higher than the pressure of the new tank 3A.
- the pressure Pa of the accumulator 103 never reaches the target pressure Pt in natural filling.
- the supply device 201 may be operated in such a manner that the pressure Pa of the accumulator 103 may reach the target pressure Pt in natural filling.
- a step similar to step ST18 may be executed in natural filling, and a valve (not shown) provided near the stop valve 55 or 57 may be closed when the target pressure Pt is obtained.
- steps ST12 and ST13 may be omitted, or the order of both may be reversed.
- Step ST14 may be omitted.
- the order of steps ST19 and ST20 may be reversed.
- Step ST19 may be omitted, and the operator may be instructed to close the stop valve 55 or the like by warning in step ST20.
- Both steps ST19 and ST20 may be regarded as abnormal processing in response to a negative determination in steps ST12 and/or ST13.
- the order of steps ST17 and ST18 may be reversed.
- the supply device 201 may replace the tank 3A instead of notifying the operator of the arrival of the replacement time of the tank 3A.
- Step ST21 may be regarded as a process of outputting a signal according to the affirmative determination of step ST17.
- the supply device 201 supplies the gas to the accumulator 103 by applying the driving force of the electric motor 9 to the gas without using the hydraulic fluid. Therefore, the same effects as those of the first embodiment can be obtained.
- the supply device 201 may have a housing member (cylinder member 213) and a movable member (piston 215), as in the first embodiment.
- the cylinder member 213 may have at least one space (first cylinder chamber 213a and second cylinder chamber 213b) communicating with the first port 41 and the second port 43 .
- the cylinder member 213 has a second cylinder chamber 213b as the at least one space on the opposite side of the piston 215 to the first cylinder chamber 213a. may further have
- the gas can be compressed not only by the outward movement of the piston 215 but also by the return movement of the piston 215 .
- the gas filling speed is improved.
- the cross-sectional areas of the cylinder chambers of the first embodiment and the second embodiment are the same, and the moving speed of the piston is the same, the amount of gas charged is less than that of the first embodiment. speed is doubled.
- the supply device 201 may further have a concentration sensor 71 that detects the concentration of a predetermined component contained in the gas.
- the supply device 201 may have a control device 105 .
- the concentration of the predetermined component (for example, nitrogen) detected by the concentration sensor 71 is equal to or lower than the predetermined threshold (negative determination in step ST12), or when the concentration of the predetermined component (for example, oxygen) detected by the concentration sensor
- the process of stopping the gas supply from the first port 41 to the second port 43 (step ST19) and the process of notifying a predetermined warning (step ST20) may be executed.
- the probability of erroneously filling the accumulator 103 with a different type of gas is reduced.
- the probability of oxygen filling the accumulator 103 due to a tank containing nitrogen being mixed up with a tank containing oxygen is reduced.
- the safety of filling the accumulator 103 with gas is improved.
- the feeding device 201 may further have casters 75 that make the feeding device 201 portable.
- the supply device 201 may have a first pressure sensor (tank pressure sensor 63), a second pressure sensor (ACC pressure sensor 65), and a control device 105.
- a tank pressure sensor 63 may detect the pressure of gas at the first port 41 .
- the ACC pressure sensor 65 may detect the gas pressure at the second port 43 .
- the control device 105 detects that gas flows from the first port 41 to the second port 43, the detection value of the tank pressure sensor 63 decreases, and the detection value of the ACC pressure sensor 65 increases. , and when these detection values become equal (affirmative determination in step ST15), the electric motor 9 may be controlled to start compressing gas by the electric motor 9 (step ST16).
- the compression unit 205 instead of driving the compression unit 205 over the entire filling period, natural filling is performed using the pressure difference during a part of the period. As a result, the energy consumption of compression section 205 is reduced. Note that, unlike the embodiment, the compression unit 205 may be driven throughout the filling period.
- FIG. 8 is a schematic diagram showing the configuration of the supply device 301 (molding machine 101B) according to the third embodiment, and corresponds to FIG.
- the supply device 301 is a combination of the first embodiment and the second embodiment. That is, it is the structure which applied the compression part 205 of 2nd Embodiment with respect to the structure for adjusting the pressure of 1st Embodiment.
- the gas circuit 307 of the supply device 301 is assumed to operate to adjust the pressure
- the return flow path 39, the supply control valve 51 and the return flow path 39, the supply control valve 51 and the return flow path 307 are assumed to be the same as the gas circuit 7 of the first embodiment. It has a control valve 53 .
- the tank 3 of the first embodiment is shown.
- the connection mode between the accumulator 103 and the supply device 301 and the connection mode between the tank 3 and the supply device 301 are also the same as in the first embodiment.
- the compression part 205 is that of the second embodiment, and the flow path around it is also the same as that of the second embodiment.
- FIG. 9 is a side view showing a die casting machine as a specific example of the molding machine 101. As shown in FIG. Although the symbol of the molding machine 101 is used here, the illustrated die casting machine may be regarded as a specific example of the molding machine 101A or 101B. The vertical direction in this figure is the vertical direction.
- the molding machine 101 manufactures a die cast product (molded product) by injecting an uncured metal material into the mold Md0 (cavity Ca) and solidifying the metal material within the mold Md0.
- the uncured state is, for example, a liquid state or a solid-liquid coexisting state.
- the metal is for example aluminum or an aluminum alloy.
- molten metal (liquid metal material) is basically taken as an example as an unhardened metal material.
- the mold Md0 includes, for example, a stationary mold Md1 and a mobile mold Md2.
- the molding machine 101 has, for example, a machine body 125 that performs mechanical operations for molding, and a control device 105 that controls the operation of the machine body 125 .
- the machine body 125 includes, for example, a mold clamping device 127 that opens and closes the mold Md0 and clamps the mold, an injection device 129 that injects molten metal into the mold Md0, and a fixed mold Md1 or a movable mold Md2 (a movable mold Md2 in FIG. and an extrusion device 131 for extruding from the mold Md2).
- the mold clamping device 127 moves the movable mold Md2 toward the fixed mold Md1 to close the mold. Further, the mold clamping device 127 performs mold clamping by applying a mold clamping force to the mold Md0 according to the extension amount of tie bars (reference numerals omitted).
- a cavity Ca having the same shape as the molded product is formed in the clamped mold Md0.
- the injection device 129 injects and fills the molten metal into the cavity Ca.
- the molten metal filled in the cavity Ca is cooled by the mold Md0 and solidified. This forms a molded product.
- the mold clamping device 127 moves the movable mold Md2 away from the fixed mold Md1 to open the mold.
- the extrusion device 131 extrudes the molded product from the movable mold Md2.
- the control device 105 may include, for example, part of the interface device 141 and a control panel (not shown).
- the interface device 141 has an input device 145 that accepts an operator's input operation, and a display device 143 that displays an image.
- the display device 143 is configured by a touch panel including a liquid crystal display or an organic EL display, for example.
- the input device 145 is composed of, for example, mechanical switches and the touch panel.
- the input device and the display device of the supply device have been mentioned so far, these may be the input device 145 and the display device 143 .
- the input device 145 and the display device 143 as shown may be provided in the supply device.
- FIG. 10 is a schematic diagram showing the configuration of the injection device 129. As shown in FIG.
- the injection device 129 has, for example, an injection sleeve 133 that communicates with the mold Md0, a plunger 135 that can slide inside the injection sleeve 133, and an injection cylinder 137 that drives the plunger 135.
- the mold Md0 side may be referred to as the front, and the opposite side may be referred to as the rear.
- the injection sleeve 133 is, for example, a cylindrical member connected to the fixed mold Md1, and has a supply port (not shown) for receiving molten metal into the injection sleeve 133 on its upper surface.
- the plunger 135 has, for example, a plunger tip 135a that can slide back and forth within the injection sleeve 133, and a plunger rod 135b whose tip is fixed to the plunger tip.
- the injection cylinder 137 is arranged coaxially with the plunger 135 behind the plunger 135 .
- the injection cylinder 137 in the illustrated example is of a so-called boosting type.
- the injection cylinder 137 includes a cylinder member 147, an injection piston 149 and a boosting piston 150 that can slide inside the cylinder member 147, and a piston rod 153 that extends forward (toward the plunger 135) from the injection piston 149. and have
- the cylinder member 147 mainly has a small-diameter cylinder (reference numeral omitted) in which the injection piston 149 slides, and a large-diameter cylinder (reference numeral omitted) located behind it and in which the boosting piston 150 slides. .
- the latter has a larger diameter than the former.
- the inside of the small-diameter cylinder is partitioned by the injection piston 149 into a rod-side chamber 147r on the side of the piston rod 153 and a head-side chamber 147h on the opposite side.
- the boosting piston 150 has a small-diameter piston (reference numerals omitted) that slides on the small-diameter cylinders, and a large-diameter cylinder (reference numerals omitted) that slides on the large-diameter cylinders.
- the large-diameter cylinder is divided into a front side chamber 147a and a rear side chamber 147b by a large-diameter piston.
- the hydraulic fluid in the accumulator 103 is supplied to, for example, the head-side chamber 147h and the rear-side chamber 147b.
- valve 157 is opened to supply the hydraulic fluid in the accumulator 103 to the head-side chamber 147h.
- This advances the injection piston 149, which in turn causes injection (eg, low speed injection and high speed injection).
- injection eg, low speed injection and high speed injection.
- the hydraulic fluid in the rod-side chamber 147r is discharged to the tank 163 via, for example, the flow control valve 161 (a meter-out circuit from another point of view).
- the valve 159 is opened to supply the hydraulic fluid in the accumulator 103 to the rear side chamber 147b.
- the pressure-increasing piston 150 increases the pressure from the accumulator 103 according to the ratio of the area receiving pressure from the head-side chamber 147h and the area receiving pressure from the rear-side chamber 147b, and transmits the increased pressure to the head-side chamber 147h.
- the valve 157 prohibits the hydraulic fluid from being discharged from the head-side chamber 147h.
- the injection device 129 shown here is merely an example.
- the injection cylinder may be of the single barrel type without the intensifier piston 150 .
- part of the advancement and retraction of the plunger 135 may be performed by an electric motor. That is, the injection device may be of a so-called hybrid type.
- the supply destination of the hydraulic fluid of the accumulator 103 may be other than the injection device.
- the machine to which the feeding device is applied is not limited to molding machines.
- it may be a machine tool or other industrial machine such as a robot.
- gas is supplied from the gas tank to the supply device.
- the first port 41 was connected to tank 3 (3A).
- the first port may be open to the atmosphere without being connected to the tank.
- the electric motor that drives the movable member (eg, piston) in the compression section of the supply device may not be a rotary type, and may be a linear motor.
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Abstract
Description
図1は、第1実施形態に係る供給装置1の構成を示す模式図である。なお、図1の上下方向と、実際の上下方向とは、一致していてもよいし、一致していなくてもよい。また、この一致及び不一致は、図1に示された構成要素同士で共通していてもよいし、共通していなくてもよい。
成形機101は、例えば、ダイカストマシン、射出成形機又は押出成形機である。成形機101の構成は、供給装置1の構成及び動作(制御)を除いて、種々の構成とされてよく、例えば、公知の構成と同様とされても構わない。
アキュムレータ103は、成形機101が有する液圧要素へ作動液を供給することによって、当該液圧要素を駆動する。液圧要素としては、例えば、液圧シリンダ及び液圧モータが挙げられる。本実施形態の説明では、基本的に液圧シリンダを例に取る。
供給装置1は、アキュムレータ103のガス室109aにガスを供給する。供給装置1は、ガスが充填されていない(別の観点では大気圧と同等の圧力を有している)ガス室109aにガスを充填することに利用可能である。また、供給装置1は、ガスが充填されたガス室109aに対する更なるガスの供給(及び/又はガスの排出)によるアキュムレータ103の圧力の調整(微調整)にも利用可能である。本実施形態の説明では、基本的に、圧力の調整に利用される態様を例に取る。
タンク3は、ガスを封入可能である限り、適宜な構成とされてよい。換言すれば、タンク3の形状、寸法(容量等)及び材料は任意である。例えば、タンク3は、ガスが充填されていないアキュムレータ103にガスを供給するために高い圧力でガスを収容しているタンク(ボンベ)と同様の構成であってもよいし、そのような構成とは異なる構成であってもよい。また、例えば、タンク3の概略形状は、円筒状であってもよいし、球体状であってもよい。また、例えば、タンク3において、高さ及び幅のいずれが大きくてもよい。
圧縮部5は、電動式のものである。すなわち、圧縮部5は、電動機9を有している。そして、電動機9の駆動力をタンク3からのガスに付与することによって、ガスをアキュムレータ103に供給する。なお、ポンプからアキュムレータへ作動液を供給してアキュムレータの圧力を上昇させる構成(液圧式の構成)においても、ポンプを駆動する電動機の駆動力がガスに付与されているといえる。ただし、ポンプを駆動する電動機の駆動力は、作動液を介してガスに付与される。一方、後述する説明から理解されるように、電動機9の駆動力は、作動液を介さずにガスに付与される。
電動機9は、特に図示しないが、電機子又は界磁の一方を構成するステータと、電機子又は界磁の他方を構成するロータとを有している。ロータはステータに対して軸回りに回転する。電動機9の具体的な構成は、適宜なものとされてよい。例えば、電動機9は、直流モータでも交流モータでもよいし、誘導モータでも同期モータでもよいし、ブレーキを有していても有していなくてもよい。電動機9は、オープンループにおいて設けられた定速電動機として機能するものであってもよいし、クローズドループにおいて設けられたサーボモータとして機能するものであってもよい。
伝達機構17は、例えば、プーリ・ベルト機構によって構成されている。具体的には、伝達機構17は、電動機9の出力軸に固定されている第1プーリ23と、変換機構19のねじ軸29(後述)に固定されている第2プーリ25と、これらのプーリに掛け渡されているベルト27とを有している。従って、電動機9が回転されると、その回転は、第1プーリ23、ベルト27及び第2プーリ25を順に経由して変換機構19に入力される。伝達機構17は、変速を行ってもよいし、変速を行わなくてもよい。図示の例では、第2プーリ25の径が第1プーリ23の径よりも大きく、伝達機構17は、増速を行う。
変換機構19は、図示の例では、ねじ機構(例えばボールねじ機構又はすべりねじ機構)によって構成されている。ねじ機構は、ねじ軸29と、ねじ軸29に螺合しているナット31とを有している。ねじ軸29及びナット31の一方の部材(図示の例ではねじ軸29)は、例えば、支持部材21に対する軸方向(図の上下方向)の移動が規制されるとともに、軸回りの回転が許容されている。ねじ軸29及びナット31の他方の部材(図示の例ではナット31)は、例えば、支持部材21に対する軸方向の移動が許容されるとともに、軸回りの回転が規制されている。従って、上記一方の部材が回転されることによって、上記他方の部材が軸方向に移動する。
シリンダ部材13の内部には、タンク3からのガスが供給されるシリンダ室13aが構成されている。シリンダ室13aの軸方向の一方は、ピストン15によって塞がれている。従って、ピストン15がシリンダ室13aの側へ移動してシリンダ室13aの容積が縮小されることによって、シリンダ室13a内のガスが圧縮される。また、ピストン15がシリンダ室13aとは反対側へ移動してシリンダ室13aの容積が拡大されることによって、シリンダ室13aにガスが補給される。
支持部材21の形状、寸法及び材料等は任意である。図示の例では、支持部材21は、シリンダ部材13に対して軸方向に直列に連結される側方部21aと、側方部21aのシリンダ部材13とは反対側に位置する端部21bとを有している。念のために記載すると、支持部材21の変換機構19等を収容している空間は、密閉されている必要は無く、例えば、大気開放されていてよい。
ガス回路7は、複数の流路を有している。複数の流路は、例えば、以下の流路を含んでいる。タンク3からシリンダ室13aへガスを供給するための上流流路35。シリンダ室13aからアキュムレータ103のガス室109aへガスを供給するための下流流路37。ガス室109aからタンク3へガスを排出するための戻し流路39。
ガス回路7は、上記の複数の流路に位置している複数の弁を有している。具体的には、以下のとおりである。
ガス回路7は、上流流路35に位置している上流逆止弁47と、下流流路37に位置している下流逆止弁49とを有している。より詳細には、上流逆止弁47は、上流流路35のうち戻し流路39と共通化されていない部分に位置している。また、下流逆止弁49は、下流流路37のうち戻し流路39と共通化されていない部分に位置している。上流逆止弁47は、第1ポート41(タンク3)からシリンダ室13aへの流れを許容するとともに、その反対方向への流れを禁止する。下流逆止弁49は、シリンダ室13aから第2ポート43(アキュムレータ103)への流れを許容するとともに、その反対方向への流れを禁止する。
ガス回路7は、下流流路37に位置している供給制御弁51と、戻し流路39に位置している戻し制御弁53とを有している。より詳細には、供給制御弁51は、下流流路37のうち、戻し流路39と共通化されていない部分に位置しているとともに、下流逆止弁49よりもアキュムレータ103側に位置している。また、戻し制御弁53は、戻し流路39のうち、下流流路37と共通化されていない部分に位置している。これらの制御弁は、制御装置105からの制御信号に従って流路を開閉する。
ガス回路7は、適宜な位置に適宜な数でストップバルブ(45、55及び57)を有してよい。ストップバルブは、手動で開閉されるバルブである。本実施形態では、成形機101の稼働中において、ストップバルブは基本的に開かれている。ストップバルブは、例えば、成形機101のメンテナンス、成形機101の組み立て、又は成形機101の解体が行われるときに、ガスの流れを禁止することに寄与する。
制御装置105は、例えば、特に図示しないが、コンピュータを含んで構成されてよい。コンピュータは、例えば、特に図示しないが、CPU(Central Processing Unit)、ROM(Read Only Memory)、RAM(Random Access Memory)及び外部記憶装置を含んで構成されてよい。CPUがROM及び/又は外部記憶装置に記憶されているプログラムを実行することによって、種々の演算(制御を含む)を行う種々の機能部が構築される。また、制御装置105は、一定の動作を実行する論理回路を含んでいてもよいし、電源回路を含んでいてもよいし、ドライバを含んで概念されてもよい。制御装置105は、ハードウェア的に1カ所に纏められていてもよいし、複数個所に分散されていてもよい。
図2は、アキュムレータ103の圧力を調整する動作を説明するためのグラフである。
図3は、図2を参照して説明した動作を実現するために制御装置105が実行する処理の手順の一例を示すフローチャートである。
図5は、第2実施形態に係る供給装置201(成形機101A)の構成を示す模式図であり、図1に対応している。
第2実施形態の圧縮部205は、圧縮シリンダの構成が第1実施形態の圧縮部5と相違する。第2実施形態の圧縮シリンダ211において、ピストン215は、例えば、ピストン本体215aと、ピストン本体215aから軸方向へ延びる第1ロッド215b及び第2ロッド215cとを有している。
ガス回路207は、圧縮部205が2つのシリンダ室を有していることに対応して、第1実施形態のガス回路7の構成要素のいくつかを2つずつ有している。具体的には、第1シリンダ室213aに関して、第1実施形態の上流流路35、下流流路37、上流逆止弁47及び下流逆止弁49に対応する、第1上流流路35A、第1下流流路37A、第1上流逆止弁47A及び第1下流逆止弁49Aが設けられている。同様に、第2シリンダ室213bに関して、第1実施形態の上記の流路及び逆止弁に対応する、第2上流流路35B、第2下流流路37B、第2上流逆止弁47B及び第2下流逆止弁49Bが設けられている。
供給装置201は、ガスの充填に利用されるものであることから、図5では、第1実施形態とは異なり(図4(b)の変形例と同様に)、タンク3に代えて、比較的高い圧力でガスを収容しているタンク3Aが示されている。また、このタンク3Aは、供給装置201の外部の要素として示されている。
第2実施形態のガス回路207は、第1実施形態のガスの圧力の調整のための構成を有していない。すなわち、ガス回路207では、第1実施形態の戻し流路39、戻し制御弁53及び供給制御弁51が設けられていない。
供給装置201は、ガスの成分の濃度を検出する濃度センサ71を有してよい。これにより、例えば、想定されているガスの種類(成分)とは異なる種類のガスをアキュムレータ103に充填する蓋然性が低減される。なお、濃度センサ71に係る構成は、第1実施形態の供給装置1に設けられても構わない。
図6は、アキュムレータ103にガスを充填する動作を説明するためのグラフであり、図2と同様の図である。
図7は、図6を参照して説明した動作を実現するために制御装置105が実行する処理の手順の一例を示すフローチャートである。
図8は、第3実施形態に係る供給装置301(成形機101B)の構成を示す模式図であり、図1に対応している。
(成形機の全体構成)
図9は、成形機101の具体例であるダイカストマシンを示す側面図である。なお、ここでは成形機101の符号を用いているが、図示のダイカストマシンは、成形機101A又は101Bの具体例として捉えられてもよい。この図の上下方向は鉛直方向である。
図10は、射出装置129の構成を示す模式図である。
射出シリンダ137は、プランジャ135の後方にプランジャ135と同軸的に配置されている。図示の例の射出シリンダ137は、いわゆる増圧式のものとされている。具体的には、射出シリンダ137は、シリンダ部材147と、シリンダ部材147の内部を摺動可能な射出ピストン149及び増圧ピストン150と、射出ピストン149から前方(プランジャ135側)へ延びるピストンロッド153と、を有している。
Claims (15)
- 電動機の駆動力を作動液を介さずにガスに付与することによってアキュムレータに前記ガスを供給する
アキュムレータ用ガス供給装置。 - ガスタンクに接続される、又は大気開放される第1ポートと、
前記アキュムレータに接続される第2ポートと、
前記第1ポート及び前記第2ポートに通じる、少なくとも1つの空間を有している収容部材と、
前記収容部材内の移動によって前記少なくとも1つの空間内のガスを圧縮する可動部材と、
前記可動部材に連結されている前記電動機と、
を有している請求項1に記載のアキュムレータ用ガス供給装置。 - 前記収容部材は、前記少なくとも1つの空間としての第1シリンダ室を有しているシリンダ部材であり、
前記可動部材は、前記シリンダ部材内を軸方向へ移動することによって前記第1シリンダ室の容積を変化させるピストンである
請求項2に記載のアキュムレータ用ガス供給装置。 - 前記シリンダ部材は、前記第1ポート及び前記第2ポートに通じるシリンダ室として前記第1シリンダ室のみを有している
請求項3に記載のアキュムレータ用ガス供給装置。 - 前記シリンダ部材は、前記ピストンに対して前記第1シリンダ室とは反対側に、前記少なくとも1つの空間としての第2シリンダ室を更に有している
請求項3に記載のアキュムレータ用ガス供給装置。 - 前記第1ポートから前記第1シリンダ室への流れを許容するとともに、その反対方向への流れを禁止する上流逆止弁と、
前記第1シリンダ室から前記第2ポートへの流れを許容するとともに、その反対方向への流れを禁止する下流逆止弁と、
を更に有している請求項4に記載のアキュムレータ用ガス供給装置。 - 前記第1ポートから前記第1シリンダ室への流れを許容するとともに、その反対方向への流れを禁止する第1上流逆止弁と、
前記第1シリンダ室から前記第2ポートへの流れを許容するとともに、その反対方向への流れを禁止する第1下流逆止弁と、
前記第1ポートから前記第2シリンダ室への流れを許容するとともに、その反対方向への流れを禁止する第2上流逆止弁と、
前記第2シリンダ室から前記第2ポートへの流れを許容するとともに、その反対方向への流れを禁止する第2下流逆止弁と、
を更に有している請求項5に記載のアキュムレータ用ガス供給装置。 - 前記少なくとも1つの空間の全てを避けて前記第1ポートと前記第2ポートとを接続している戻し流路と、
前記戻し流路を開閉する制御弁と、
を更に有している請求項2~7のいずれか1項に記載のアキュムレータ用ガス供給装置。 - 前記ガスに含まれる所定の成分の濃度を検出する濃度センサを更に有している
請求項1~8のいずれか1項に記載のアキュムレータ用ガス供給装置。 - 該アキュムレータ用ガス供給装置を可搬にするキャスターを更に有している
請求項1~9のいずれか1項に記載にアキュムレータ用ガス供給装置。 - 前記第2ポートにおける前記ガスの圧力を検出する圧力センサと、
前記電動機を制御する制御装置と、
を更に有しており、
前記制御装置は、前記圧力センサの検出値が目標圧力よりも低いときに前記電動機によって前記ガスを圧縮して前記アキュムレータに供給し、前記圧力センサの検出値が前記目標圧力よりも高いときに前記アキュムレータから前記戻し流路を介して前記第1ポートへ前記ガスを放出するように前記電動機及び前記制御弁を制御する
請求項8に記載のアキュムレータ用ガス供給装置。 - 前記第1ポートにおける前記ガスの圧力を検出する第1圧力センサと、
前記第2ポートにおける前記ガスの圧力を検出する第2圧力センサと、
前記電動機を制御する制御装置と、
を更に有しており、
前記制御装置は、前記電動機が停止している状態で、前記第1ポートから前記第2ポートへ前記ガスが流れ、前記第1圧力センサの検出値が低下するとともに前記第2圧力センサの検出値が上昇し、これらの検出値が同等となったときに、前記電動機による前記ガスの圧縮を開始するように前記電動機を制御する
請求項2~8のいずれか1項に記載のアキュムレータ用ガス供給装置。 - 前記濃度センサが検出する前記所定の成分の濃度が所定の閾値以下であるとき、又は前記濃度センサが検出する前記所定の成分の濃度が所定の閾値以上であるとき、前記第1ポートから前記第2ポートへの前記ガスの供給を停止する処理、及び所定の警告を報知する処理の少なくとも一方を実行する制御装置を更に有している
請求項9に記載のアキュムレータ用ガス供給装置。 - 請求項1~13のいずれか1項に記載のアキュムレータ用ガス供給装置と、
前記アキュムレータと、
前記アキュムレータから作動液が供給されて駆動される駆動部と、
を有している成形機。 - 前記駆動部は、型内に向かって成形材料を押し出すプランジャと連結される液圧シリンダである
請求項14に記載の成形機。
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- 2022-05-17 WO PCT/JP2022/020464 patent/WO2022244755A1/ja active Application Filing
- 2022-05-17 CN CN202280036172.7A patent/CN117321311A/zh active Pending
Patent Citations (6)
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JPH0742585Y2 (ja) * | 1989-12-20 | 1995-10-04 | エヌオーケー株式会社 | 圧力封入装置 |
JPH07223016A (ja) * | 1994-02-16 | 1995-08-22 | Kawasaki Steel Corp | デスケーリングシステムのアキュームレータの気体補給量制御方法 |
JPH09296778A (ja) * | 1996-05-02 | 1997-11-18 | Katsuragawa Electric Co Ltd | モータ一体型ポンプ |
JP2001116001A (ja) * | 1999-10-20 | 2001-04-27 | Nhk Spring Co Ltd | アキュムレータのガス封入装置及びガス封入方法 |
JP2002301560A (ja) * | 2001-04-04 | 2002-10-15 | Toshiba Mach Co Ltd | アキュムレータのガス充填装置および射出装置 |
WO2016208604A1 (ja) * | 2015-06-23 | 2016-12-29 | Thk株式会社 | 電動アクチュエータを用いたエアポンプ装置及びエアポンプシステム |
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CN117321311A (zh) | 2023-12-29 |
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