JP7368270B2 - Extrusion device and its temperature control method - Google Patents

Description

The present invention relates to an extrusion device and a temperature control method thereof.

It has a temperature adjustment section that adjusts the temperature of the heat transfer fluid, a gear shaft whose temperature is controlled by the heat transfer fluid from the temperature adjustment section, and a bearing that receives the gear shaft, and also pressurizes a predetermined material melt-kneaded by an extruder. An extrusion device including a gear pump is known (see, for example, Patent Documents 1 to 3).

Japanese Patent Application Publication No. 2002-139061 Japanese Patent Application Publication No. 2002-139062 Japanese Patent Application Publication No. 10-141247

By the way, in an extrusion apparatus, the temperature control of the downstream equipment of the extruder and the temperature control of the gear shaft and bearing of the gear pump are performed by independent temperature adjustment sections because the required temperatures are different. For this reason, there have been problems in that a large installation space is required for the temperature adjustment section, temperature control is complicated, and manufacturing costs are increased.

The present invention has been made to solve these problems, and aims to provide an extrusion device that simplifies temperature control, saves space, and reduces manufacturing costs, and a method for controlling its temperature. Make it the main purpose.

One aspect of the present invention for achieving the above object is
a temperature adjustment section that adjusts the temperature of the heat transfer fluid;
a predetermined device that is disposed downstream of an extruder that melts and kneads a predetermined material, is connected to the temperature adjustment section, and is heated by a heat transfer fluid sent from the temperature adjustment section;
The gear shaft is connected to the predetermined equipment, has a gear shaft whose temperature is regulated by a heating medium fluid whose temperature has been lowered and is sent out from the predetermined equipment, and a bearing for receiving the gear shaft, and has a predetermined material melt-kneaded by the extruder. This is an extrusion device characterized by comprising a gear pump that increases pressure.
In this aspect, the predetermined equipment may include a filtration device that filters the predetermined material, and a diverter valve provided between the extruder, the gear pump, and the extruder.
One aspect of the present invention for achieving the above object is
a temperature adjustment section that adjusts the temperature of the heat transfer fluid;
a predetermined device connected to the temperature adjustment section located downstream of an extruder that extrudes a predetermined material;
A method for controlling the temperature of an extrusion device, comprising: a gear pump connected to the predetermined equipment, having a gear shaft and a bearing for receiving the gear shaft, and pressurizing a predetermined material melt-kneaded by the extruder,
heating the predetermined equipment with a heat medium fluid sent from the temperature adjustment section;
The temperature control method for an extrusion device may include the step of controlling the temperature of the gear shaft and the bearing with a heat transfer fluid sent from the predetermined device.

According to the present invention, it is possible to provide an extrusion device that simplifies temperature control, saves space, and reduces manufacturing costs, and a method for controlling the temperature thereof.

1 is a block diagram showing a schematic configuration of an extrusion device according to an embodiment of the present invention. 1 is a block diagram showing a schematic system configuration of an extrusion device according to an embodiment of the present invention. 1 is a schematic diagram showing a schematic configuration of an extrusion device according to an embodiment of the present invention. 1 is a flowchart showing a flow of a temperature control method for an extrusion device according to an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an extrusion device according to an embodiment of the present invention.

By the way, in conventional extrusion apparatuses, the temperature control of downstream equipment of the extruder and the temperature control of the gear shaft and bearing of the gear pump are performed by independent temperature adjustment sections. For this reason, a large installation space is required for the temperature adjustment section, and since the required temperatures are different, the temperature control becomes complicated, resulting in an increase in manufacturing costs.

In contrast, an extrusion device 1 according to an embodiment of the present invention includes a temperature adjustment section 2 that adjusts the temperature of a heat transfer fluid, and a temperature adjustment section 2 that is disposed downstream of an extruder that melts and kneads a predetermined material. A predetermined device 3 that is connected to the device and heated by the heat medium fluid sent out from the temperature adjustment section 2, an extruder 4, and a predetermined device 3 are connected in series, and heated by the heat medium fluid sent out from the predetermined device 3. A gear pump 5 is provided, which has a gear shaft 51 and a bearing 52 for adjusting the temperature, and also increases the pressure of a predetermined material melt-kneaded by the extruder 4.

The heat medium fluid from the temperature adjustment section 2 heats the predetermined device 3 by radiating heat to the predetermined device 3 when circulating through the predetermined device 3 . The temperature of the heat transfer fluid itself is appropriately reduced by radiating heat to the predetermined equipment 3. Furthermore, the low-temperature heat medium fluid controls the temperature of the gear shaft 51 and bearing 52 of the gear pump 5 at a low temperature.

In this way, the heating of the predetermined equipment 3 downstream of the extruder 4 and the low-temperature temperature control of the gear shaft 51 and bearing 52 of the gear pump 5 are controlled by a series of heating medium fluids using the single temperature adjustment section 2. This can be achieved through flow. That is, the temperature control of the predetermined equipment 3 downstream of the extruder 4 and the temperature control of the gear shaft 51 and bearing 52 of the gear pump 5 can be efficiently performed by the single temperature adjustment section 2. Therefore, since only a single temperature adjustment section 2 is required, temperature control can be simplified, and space and manufacturing costs can be reduced.

FIG. 2 is a block diagram showing a schematic system configuration of an extrusion device according to an embodiment of the present invention. The temperature adjustment unit 2 includes an expansion tank 21 that stores a heat transfer fluid, a pair of pumps 22 that pumps out the heat transfer fluid (one of the pair is a standby reserve), and a heater 23 that heats the heat transfer fluid. and a cooler 24 that cools the heat transfer fluid. As the heat transfer fluid, for example, hot water, heat transfer oil, or the like may be used. A user can adjust the temperature of the heat medium fluid by adjusting the set temperatures of the heater 23 and the cooler 24.

For example, the set temperatures of the heater 23 and cooler 24 and the discharge amount of each pump 22 are experimentally determined to optimally heat the predetermined equipment 3 and control the temperature of the gear shaft 51 and bearing 52 of the gear pump 5. Desired. The determined values are set as the set temperatures of the heater 23 and the cooler 24 and the discharge amount of each pump 22, respectively.

The cooler 24 and the heater 23 may be integrally configured. The pair of pumps 22 may be integrally configured. Further, a configuration may be adopted in which at least one of the pair of pumps 22 is provided.

The expansion tank 21 is connected to each pump 22 via a pair of channels 251, respectively. Each pump 22 is connected to the cooler 24 via a pair of channels 252, respectively. Cooler 24 is connected to heater 23. The heater 23 is connected to the predetermined device 3 via a flow path 253. Valves 261 and 262 are provided in the flow path 253 near the predetermined device 3 and near the outlet side of the temperature adjustment section 2, respectively.

Expansion tank 21 delivers heat transfer fluid to each pump 22 via flow path 251 . Each pump 22 sends heat transfer fluid to cooler 24 and heater 23 via flow path 252 . The cooler 24 and the heater 23 adjust the temperature of the heat medium fluid, and send the adjusted heat medium fluid to the predetermined device 3 via the flow path 253. Further, depending on the temperature of the heat transfer fluid, the cooler 24 may be bypassed in some cases.

The predetermined equipment 3 is heated by the heat medium fluid sent from the temperature adjustment section 2 . FIG. 3 is a schematic diagram showing the general configuration of the extrusion device according to this embodiment. Downstream equipment is arranged downstream of the extruder 4.

The downstream devices include, for example, a diverter valve 32, a gear pump, a filtration device 31, and a granulation device 33. The predetermined equipment 3 includes a filtration device 31 and a diverter valve 32 among downstream equipment. The filtration device 31 includes a filtration screen and the like. The filtration screen filters a predetermined material and removes dirt, impurities, etc. from the predetermined material.
The filtration device 31 may be provided with a screen changer that is a screen exchange mechanism. A screen changer includes, for example, a housing that is provided with a resin flow path for passing molten resin therein, a plurality of cartridges for filtration that are provided with gaps in the resin flow path of this housing, a slide bar, and the like. have.

Diverter valve 32 is provided between extruder 4 and gear pump 5. The diverter valve 32 is a device that switches between flowing the predetermined material melt-kneaded by the extruder 4 to the filtration device 31 or discharging it to the outside. For example, at the start of operation when the physical properties of the predetermined material melt-kneaded in the extruder 4 are not stable in a steady state, the predetermined material is discharged to the outside from the diverter valve 32. The granulating device 33 is a device that processes a predetermined material into pellets.

The extruder 4 melts and kneads a predetermined material from a powder state to about 200 to 300° C., for example, by rotating a screw by a drive motor 42 via a speed reducer 41. The predetermined material is, for example, powder of synthetic resin such as polyethylene PE or polypropylene PP. Although the extruder 4 shown in FIG. 3 is configured as a twin-screw extruder in which the screw shaft is supported by a bearing on only one side, the extruder 4 is not limited to this. The extruder 4 is a single-screw extruder, a twin-screw extruder that meshes with each other and rotates in the same direction, or a two-screw non-meshing extruder that rotates in different directions with two screws that rotate in different directions without meshing, with both shaft ends supported by bearings. The extruder may be configured as a multi-screw extruder having two or more screw shafts.

The gear pump 5 is connected in series to a predetermined device 3 via a flow path 254. The gear pump 5 increases the pressure of the predetermined material melt-kneaded by the extruder 4. The gear pump 5 increases the pressure of a predetermined material to a high pressure of about 20 to 30 MPa, for example, by rotating a pair of gear rotors that mesh with each other.

In the gear rotor, for example, a gear portion and a gear shaft 51 are integrally molded. Both ends of the gear shaft 51 are rotatably supported by bearings 52 (sleeve bearings). There is a gap between the shaft and the bearing, and molten resin enters the gap, which acts as a lubricant. In this manner, when the gear pump 5 is in operation, the gear shaft 51 and the bearing 52 in particular become high in temperature, so temperature control is required as described above.

The predetermined device 3 is connected to the gear pump 5 via a flow path 254 (FIG. 2). The temperature of the gear shaft 51 and bearing 52 of the gear pump 5 is controlled by the circulation of the heat medium fluid from the flow path 254. The flow path 254 branches before the gear pump 5, and the branched flow path 255 joins a flow path 256 exiting from the gear pump 5. The merged channel 256 is connected to one channel 251 extending from the expansion tank 21 . Further, valves 263 and 264 are provided in the merged flow path 256 near the gear pump 5 and near the inlet side of the temperature adjustment section 2, respectively.

The flow path 256 and the flow path 253 are connected via a flow path 257. A valve 265 is provided near the middle of the flow path 257. The branch flow path 255 and the flow path 256 exiting from the gear pump 5 are provided with orifices 271 and 272, respectively, for adjusting the flow rate.

By adjusting the apertures of the orifices 271 and 272, the flow rates of the respective flow paths 255 and 256 can be appropriately set. By opening and closing the valves 261, 262, 263, 264, and 265, the flow paths 253, 256, and 257 can be freely switched.

A flow path 253 between the heater 23 of the temperature adjustment section 2 and the predetermined device 3 is provided with a first flow rate transmitter 28 that detects the flow rate of the heat medium fluid in the flow path 253. The user can monitor the flow rate of the heat medium fluid flowing into the predetermined device 3 based on the flow rate detected by the first flow rate transmitter 28 .

Similarly, a second flow rate transmitter 29 is provided in the flow path 254 between the predetermined device 3 and the gear pump 5 to detect the flow rate of the heat medium fluid in the flow path 254 . The user can monitor the flow rate of the heat medium fluid flowing into the gear pump 5 based on the flow rate detected by the second flow rate transmitter 29.

For example, the first and second flow rate transmitters 28 and 29 may transmit the detected flow rates to a terminal device or the like via wireless or wire. The user can monitor the flow rates of the heat medium fluid in the predetermined equipment 3 and gear pump 5 by displaying the flow rates of the first and second flow rate transmitters 28 and 29 on the display of the terminal device or the like.

In the extrusion device 1, a predetermined material is processed, for example, as follows. A predetermined material is continuously supplied into the cylinder 43 of the extruder 4 via a hopper 44 (FIG. 3). The extruder 4 melts and kneads the supplied predetermined material and discharges it to the gear pump 5 via the diverter valve 32. The gear pump 5 increases the pressure of a predetermined material discharged from the extruder 4. The filtration device 31 filters the predetermined material pressurized by the gear pump 5 to remove impurities. The granulating device 33 processes the filtered predetermined material into pellet-like material.

Next, the flow of the temperature control method for an extrusion apparatus according to this embodiment will be described in detail. FIG. 4 is a flowchart showing the flow of the temperature control method for an extrusion device according to this embodiment.

The temperature adjustment unit 2 adjusts the temperature of the heat medium fluid by heating or cooling it using the heater 23 or the cooler 24, and sends it out to the predetermined device 3 (step S401).

When the heat transfer fluid circulates through the predetermined device 3, it radiates heat to the predetermined device 3, thereby heating the predetermined device 3 (step S402). The temperature of the heat transfer fluid itself is appropriately reduced by radiating heat to the predetermined equipment 3.

The predetermined device 3 sends the low temperature heat medium fluid to the gear pump 5 (step S403). Further, the flow rate of the heat medium fluid may be adjusted using a flow rate limiting orifice or the like (step S404).

The low-temperature heat medium fluid circulates through the gear shaft 51 and bearing 52 of the gear pump 5, and controls the temperature of the gear shaft 51 and bearing 52 (step S405).

In this way, the heating of the predetermined equipment 3 downstream of the extruder 4 and the temperature control of the gear shaft 51 and bearing 52 of the gear pump 5 are realized by a series of flows of the heat medium fluid using the single temperature adjustment section 2. can. That is, the temperature control of the predetermined equipment 3 downstream of the extruder 4 and the temperature control of the gear shaft 51 and bearing 52 of the gear pump 5 can be efficiently performed by the single temperature adjustment section 2. Therefore, since only a single temperature adjustment section 2 is required, temperature control can be simplified, and space and manufacturing costs can be reduced.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

1 Extrusion device 2 Temperature adjustment section 3 Predetermined equipment 4 Extruder 5 Gear pump 21 Tank 22 Pump 23 Heater 24 Cooler 28 Flow rate transmitter 29 Flow rate transmitter 31 Filtration device 32 Diverter valve 33 Granulation device 41 Reducer 42 Drive motor 43 Cylinder 44 Hopper 51 Gear shaft 52 Bearing 251 Channel 252 Channel 253 Channel 254 Channel 255 Branch channel 255 Channel 256 Channel 257 Channel 261 Valve 262 Valve 263 Valve 264 Valve 265 Valve 271 Orifice 272 Orifice

Claims (3)

a temperature adjustment section that adjusts the temperature of the heat transfer fluid;
a predetermined device that is disposed downstream of an extruder that melts and kneads a predetermined material, is connected to the temperature adjustment section, and is heated by a heat transfer fluid sent from the temperature adjustment section;
It has a gear shaft of a gear pump that is connected to the predetermined equipment and whose temperature is controlled by a heat transfer fluid sent out from the predetermined equipment, and a bearing that receives the gear shaft, and also increases the pressure of the predetermined material melt-kneaded by the extruder. gear pump and
An extrusion device comprising: The extrusion device according to claim 1,
The extrusion device is characterized in that the predetermined equipment includes a filtration device that filters the predetermined material, and a diverter valve provided between the extruder and the gear pump. a temperature adjustment section that adjusts the temperature of the heat transfer fluid;
a predetermined device disposed downstream of an extruder that melts and kneads a predetermined material and connected to the temperature adjustment section;
a gear pump connected to the predetermined equipment, having a gear shaft and a bearing for receiving the gear shaft, and pressurizing the predetermined material melt-kneaded by the extruder;
A method for controlling the temperature of an extrusion device comprising:
heating the predetermined equipment with a heat medium fluid sent from the temperature adjustment section;
controlling the temperature of the gear shaft and bearing with a heat transfer fluid sent from the predetermined device;
A method for controlling the temperature of an extrusion device, comprising:

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