JP4293564B2 - Drive device for twin screw extruder and drive method thereof - Google Patents

Description

  The present invention relates to a driving device and a driving method for driving a speed reducer of a biaxial melt kneading extruder.

  As a conventional device of this type, the following patent document is known as an “extrusion drive device for a double screw extrusion molding machine” (see, for example, Patent Document 1). This relates to a planetary gear device having two drive input units driven by two different motors, and an output is rotated by changing the number of rotations by adding an electrical control device to the auxiliary motor side. It can be varied in the area.

Japanese Patent Laid-Open No. 11-115035

  The granulation equipment for polyolefin is becoming larger, and the drive unit of the twin screw extruder used therein is required to output 10,000 kW or more. Although it is possible to cover the output with a single motor and the system configuration is simple, the following problems must be solved as the capacity increases.

1) The efficiency in low capacity operation of one large motor (constant speed induction motor) is poor, and the running cost is high.
2) When a single large motor is started by directly entering it, a starting current of about 500% of the rating is applied, so a large-scale supply side facility is required. In addition, when the capacity of the supply facility is limited, a device (soft starter) that starts up while electrically suppressing current is required.
3) Although the above 1) and 2) can be solved by attaching an electric control device to one large motor, the investment amount of the equipment becomes high and is not adopted.

  The present invention has been made to solve the above-described problems, and aims to improve efficiency by operating only one required unit by dividing the required output into two motors. It is said.

  It is another object of the present invention to provide an apparatus that enables two-stage capacity enhancement even in future capacity enhancement.

  Furthermore, the present invention is an apparatus that can suppress the starting current by dividing the motor into two motors and having only one electric motor have the function, and starting the other motor when the rated speed is reached. The purpose is to provide.

  In order to achieve the above object, the present invention is configured to divide an output required as a drive device by a main motor and a sub motor and connect them in series to transmit the total drive force to the reduction gear.

  The sub motor is provided with an electrical control device, and can be linked to the main motor. To increase the efficiency in low capacity operation, switch on the main motor only and switch off the sub motor. In addition, it is possible to remove the coupling of the auxiliary motor and to use only the main motor.

  According to such a configuration, since it has been found that the motor efficiency is best when operating near the rated output, the rated output of the main motor is determined from the driving force required during low capacity operation as an extruder. As a result, it is possible to operate with higher efficiency than in the case of driving with a single motor in the low capacity operation region.

  As a method for suppressing the starting current as the driving device, the auxiliary motor is controlled with the electric controller to control the rotation speed, and is started up while suppressing the starting current. During this time, the main motor is not switched on, and is in a state of being rotated. When the main motor reaches the rated speed, the main motor is switched on to enable starting with reduced starting current.

That is, the present invention is a drive device for a twin-screw extruder used in a twin-screw extruder, in which a main motor 12 and a sub-motor 11 different from the main motor are connected in series, and a driving force is applied to the reduction gear 13. It is characterized by transmitting.
Further, the present invention is characterized in that the sub motor 11 can be connected / disconnected to / from the main motor 12.
Furthermore, the present invention is characterized in that a reduction gear is connected to the main motor 12 so that the driving force can be transmitted only by the main motor 12.

  Further, according to the present invention, the main motor 12 and the sub motor 11 are motors having different rated outputs and different characteristics (or the same motor), and the output and the number of rotations generated by the sub motor 11 can be adjusted. An electric control device 90 is provided, and the sub motor 11 is controlled by the control device and interlocked with the main motor 12.

  In addition, the present invention is characterized in that the sub motor 11 has a function as a resin discharging device.

  Further, regarding the connection arrangement of the main motor 12 and the sub motor 11 that can be connected in series and the speed reducer 13, the main motor 12 is connected to one end of the input shaft 20 of the speed reducer 13 and the other end is connected. The sub motor 11 is connected to transmit the driving force.

  The main motor 12 and the sub motor 11 have different rated outputs and characteristics (the same motor may be used), and these two motors 11 and 12 are connected in series, or both ends of the input shaft 20 of the speed reducer. In the connection, an electrical control device 90 that can adjust the output and rotation speed generated by the sub motor 11 is provided, and the sub motor 11 is controlled by the control device and interlocked with the main motor 12. .

  In addition, the start-up method in which the start-up current of the main motor 12 is suppressed in the above-described series connection of the two different motors 11 and 12 or the both-end connection of the input shaft 20 of the speed reducer and the control device 90 for the sub motor. It is characterized by having.

  As described above, according to the present invention, since the output required as the driving device is divided by the main motor and the sub motor, the efficiency in the low capacity operation region as the extruder can be increased and the running cost can be suppressed.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a diagram showing the periphery of a drive unit of a twin-screw extruder driving device according to the present invention in which an electric main motor and a secondary motor adjustable by an electric control device are connected in series, FIG. 2 is a torque at the time of starting the main motor, It is a graph of an electric current and rotation speed.

  In FIG. 1, 11 is a sub motor, 12 is a main motor, 13 is a speed reducer, 17 is a coupling between the sub motor 11 and the main motor 12, 18 is a coupling between the main motor 12 and the speed reducer 13, and 14 is a speed reducer 13. A resin discharging speed reducer provided with a connecting and blocking function, 15 is a resin discharging motor provided via a coupling 19, and 16 is an output shaft of a twin screw extruder.

  In the above configuration, the main motor 12 has the shaft extended on both sides, and a load can be connected to either side, and the strength thereof can withstand the total output including the main motor 12 and the sub motor 11.

  The main motor 12 has a configuration in which the reduction gear 13 is connected to the load side of the shaft of the main motor 12 and the auxiliary motor 11 is connected to the non-load side by the couplings 18 and 17. The main motor 12 and the auxiliary motor 11 are combined. The total output is transmitted to the speed reducer 13 as a driving force.

  During the series operation of both motors, the sub motor 11 is supplied with motive power via the electrical control device 90, and is drivingly controlled to share the required load with the main motor 12.

  In this case, a kW signal (80a: power signal) from the kW meter (80: power meter) of the main motor is sent to the electrical control device 90, and load sharing control is executed and output to the sub motor 11. The kW signal 80a may be controlled by replacing it with a current signal or a torque signal.

  When the low-capacity operation continues in the operation of the twin-screw extruder, or when the sub-motor 11 is planned to be installed in the future, the operation with only the main motor 12 is possible. In the former, the coupling 17 is in a connected state, and in the latter, the coupling 17 is not installed.

  That is, the sub motor 11 is provided to the main motor 12 so that it can be connected and disconnected. In this low capacity operation, when the auxiliary motor switch 91 is turned off (off) and the main motor switch 81 is turned on (on), a starting current of about 500% of the rated current flows to the main motor 12. This state is recognized at the position where the rotational speed is 0% in the curve of the starting current (at all voltages) in FIG.

  As the twin screw extruder, only the main motor 12 is operated. However, when it is desired to start up while suppressing the starting current, the auxiliary motor 11 and the electric control device 90 can be used. In this case, the main motor switch 81 is turned off and the sub motor switch 91 is turned on.

  Next, the secondary motor 11 increases the rotational speed over time by controlling the rotational speed of the electrical control device 90, and when the rated speed is reached, the switch 91 of the secondary motor 11 is turned off. After both motors are in a free-run state, that is, the switch 81 of the main motor 12 is turned on.

  In this case, the starting current can be suppressed to 100% or less of the rating. The curve of the starting current (at the time of full voltage or 85% voltage) in FIG. 2 is recognized at a position where the rotational speed is 95% or more.

  In the case of series operation with two motors, only a start-up method with reduced start-up current is possible. In this case, the switch 81 of the main motor 12 is turned off and the switch 91 of the sub motor 11 is turned on.

  Next, the sub motor 11 increases the rotational speed over time by controlling the rotational speed of the electrical control device 90, and when the rated speed is reached, the switch 81 of the main motor 12 is turned on. Then, the control mode of the electrical control device 90 is switched from the rotational speed control to the load sharing control, and the series operation is started.

  In this case as well, the starting current can be suppressed to 100% or less. The curve of the starting current (at the time of full voltage or 85% voltage) in FIG. 2 is recognized at a position where the rotational speed is 95% or more.

Embodiment 2. FIG.
As shown in FIG. 1, the drive device for a twin-screw extruder shown in the first embodiment has a resin discharging device (14, 15, 19) to which a connecting and blocking function is added. In order to relieve the load torque, it is necessary to start the main or sub motor after disconnecting the resin that is connected and discharging and then shutting off the resin.

  In the second embodiment of the present invention, the sub motor 11 is provided with a resin discharging function to reduce the resin discharging device.

  In the first embodiment, it is possible to increase the capacity in two stages by adding a sub motor in the future. However, in the second embodiment, since the sub motor has a resin discharging function, the first motor is installed from the first installation stage. Both main and sub motors are required.

The second embodiment of the present invention will be described below with reference to FIG.
FIG. 3 is a view showing the periphery of the drive unit of a twin-screw extruder drive device in which an electric main motor and a secondary motor that can be adjusted by an electric control device are connected in series.

  In FIG. 3, 11 is a sub motor, 12 is a main motor, 13 is a speed reducer, 17 is a coupling between the sub motor 11 and the main motor 12, 18 is a coupling between the main motor 12 and the speed reducer 13, and 16 is a biaxial extrusion. This is an output shaft of the machine, and the same object as in FIG.

  In the second embodiment, in the series operation with both motors, the sub motor 11 is supplied with power power via the electrical control device 90, and controls the drive so as to share the required load with the main motor 12. I am doing so.

  The shaft of the main motor 12 is extended on both sides, and a load can be connected to either of them, and the strength thereof can withstand the total output including the main motor 12 and the sub motor 11.

  The shaft of the main motor 12 is connected to the speed reducer 13 on the load side and the sub motor 11 to the opposite load side by the couplings 18 and 17. The main motor 12 and the sub motor 11 are combined. The total output is transmitted to the speed reducer 13 as a driving force.

  The both sides of the speed reduction device 13 have a configuration of a main motor 12 and a sub motor 11 connected by respective couplings 18 and 17, and the total output is transmitted to the speed reduction device 13 as a driving force.

  In this case, a kW signal (80a: power signal) from the kW meter (80: power meter) of the main motor 12 is sent to the electrical control device 90, where load sharing control is performed and output to the sub motor 11. The kW signal 80a may be controlled by replacing it with a current signal or a torque signal.

  As the operation of the twin-screw extruder, it is necessary to first discharge the resin accumulated in the cylinder. This is done by turning on (turning on) the switch 91 of the sub-motor and turning the sub-motor 11 on the electric controller 90. This is done by operating at low speed by number control.

  Next, the sub motor 11 increases the rotational speed over time by controlling the rotational speed of the electrical control device 90, and when the rated speed is reached, the switch 81 of the main motor 12 is turned on. Then, the control mode of the electrical control device 90 is switched from the rotational speed control to the load sharing control, and the interlocking operation of both motors is started.

  In this case as well, the starting current can be suppressed to 100% or more of the rating. This is the same as in the first embodiment described above.

  As described above, in the second embodiment, in order to give the sub motor a resin discharging function, the capacity of the conventional resin discharging device (output of the resin discharging motor × speed ratio of the resin discharging speed reducer) It is necessary to give the secondary motor an output suitable for the above. In this case, the output of the main motor can be determined by the output required as the driving device-the output of the sub motor. Accordingly, the rotational speed control is performed by the electric control device of the sub motor, and the resin in the cylinder is discharged in the low speed range to reduce the load. After that, the electric control device accelerates while suppressing the starting current. During this time, the main motor is not switched on, and is in a state of being rotated. When the main motor reaches the rated speed, the main motor is switched on so that the start-up can be performed while suppressing the start-up current.

Embodiment 3 FIG.
The third embodiment of the present invention will be described below with reference to FIG.

  FIG. 4 is a view showing the periphery of the drive unit of a twin-screw extruder drive device in which a main motor and a sub-motor that can be adjusted by an electric control device are connected to both ends of the input shaft 20 of the speed reducer.

  In the third embodiment, in the operation in which both motors are connected to both ends of the input shaft 20 of the speed reducer, the auxiliary motor 11 is supplied with power power via the electric control device 90 and is required to be the main motor 12. The drive is controlled to share the burden.

  In FIG. 4, 11 is a sub motor, 12 is a main motor, 13 is a speed reducer, 17 is a coupling between the sub motor 11 and the speed reducer 13, 18 is a coupling between the main motor 12 and the speed reducer 13, and 20 is a speed reducer. The input shaft 16 is an output shaft of the twin-screw extruder, and the same reference numerals as those in FIGS. 1 and 3 denote the same objects, and the description thereof is omitted here. In the third embodiment, the shaft of the speed reducer 13 is extended on both sides, and a load can be connected to either side, and the strength thereof can withstand the total output including the main motor 12 and the sub motor 11. .

  In the first and second embodiments, in the serial connection of two large motors, the shaft of the main motor 12 is extended at both ends and can withstand transmission of the total power of the main and sub motors. Must be a thing. The third embodiment is a method in which the main and sub motors are connected to both ends of the input shaft 20 of the speed reducer, respectively, without extending the non-load side shaft of the main motor, and the torque is a standard that conforms to the rating. There is an advantage that you can use anything.

  As described above, according to the embodiment of the present invention, since the output required as the drive device is divided by the main motor and the sub motor, the efficiency in the low capacity operation region as the extruder is increased and the running cost is suppressed. be able to.

  Moreover, by starting in order of the sub motor and the main motor, the starting current at the time of starting can be suppressed, and the capacity and cost of the power supply equipment can be reduced.

  Furthermore, according to the embodiment of the present invention, since the resin discharging device required as a driving device is reduced and the sub motor has the function, the system can be simplified.

  Further, as shown in the third embodiment, in the method of connecting the main and sub motors to both ends of the input shaft 20 of the reduction gear, respectively, without extending the non-load side shaft of the main motor as in the case of series connection. There is an advantage that a standard shaft can be used.

  Further, the power required for the shaft of the main motor can be equivalent to the rated output.

It is a block diagram which shows Embodiment 1 of this invention. It is a figure which shows operation | movement of Embodiment 1 of this invention. It is a block diagram which shows Embodiment 2 of this invention. It is a block diagram which shows Embodiment 3 of this invention.

Explanation of symbols

  11 Sub motor, 12 Main motor, 13 Reduction gear, 14 Resin discharge speed reducer, 15 Resin discharge motor, 16 Output shaft, 17-19 coupling, 20 Reduction gear input shaft, 80 kW meter, 80a Main motor kW signal, 90 electrical control unit, 81 main motor switch, 91 sub motor switch.

Claims (10)

A drive device for a twin screw extruder used in a twin screw extruder,
The main motor (12) and the sub motor (11) can be connected / disconnected in series, and only the main motor (2) or only the sub motor (11), and further the main motor (12) and the sub motor (11) Both driving forces can be transmitted to the speed reducer (13),
The main motor (12) and the sub motor (11) are motors having different rated outputs and / or characteristics different from each other, and are capable of adjusting the output and the rotational speed generated by the sub motor (11). A drive device for a twin-screw extruder, characterized in that a device (90) is provided, the sub-motor (11) is controlled by the control device and interlocked with the main motor (12). The drive device for a twin-screw extruder according to claim 1,
The electric control device (90) is a drive device for a twin-screw extruder, wherein the start-up is performed while suppressing the start-up current of the motor. A driving method for a twin screw extruder for driving a twin screw extruder,
The main motor (12) and the sub motor (11) can be connected / disconnected in series, and only the main motor (2) or only the sub motor (11), and further the main motor (12) and the sub motor (11) Both driving forces can be transmitted to the speed reducer (13),
The main motor (12) and the sub motor (11) are motors having different rated output and / or different characteristics, and the sub motor can be adjusted electrically by adjusting the output and the rotational speed generated by the sub motor (11). (11) is controlled and interlocked with the main motor (12). The drive method for a twin-screw extruder according to claim 3,
The sub-motor (11) is configured to start while suppressing the starting current of the motor. In the drive device for a twin-screw extruder, in which a main motor (12) and a sub motor (11) having different rated output and characteristics are connected in series, and a driving force is transmitted to a reduction gear (13).
When discharging the resin in the twin screw extruder, the secondary motor (11) is driven to transmit the driving force of the secondary motor (11) to the output shaft of the twin screw extruder, and
Electricity that makes it possible to adjust the output and the number of rotations generated by the sub motor (11) when the main motor (12) and the sub motor (11) are connected in series or at both ends of the input shaft (20) of the reduction gear. A control device (90) is provided, the sub motor (11) is controlled by the control device and interlocked with the main motor (12). In the drive device for a twin-screw extruder, in which a main motor (12) and a sub motor (11) having different rated output and characteristics are connected in series, and a driving force is transmitted to a reduction gear (13).
When discharging the resin in the twin screw extruder, the secondary motor (11) is driven to transmit the driving force of the secondary motor (11) to the output shaft of the twin screw extruder, and
Regarding the connection arrangement of the main motor (12) and the sub motor (11) and the reduction gear (13) that can be connected in series, the main motor (at the end of one of the input shafts (20) of the reduction gear (13)). 12) and a secondary motor (11) connected to the other end to transmit the driving force,
Furthermore, in the serial connection of the main motor (12) and the sub motor (11) or the both ends connection of the input shaft (20) of the speed reducer, the output and rotation speed generated by the sub motor (11) can be adjusted. A drive device for a twin-screw extruder, characterized in that an electrical control device (90) is provided, the sub-motor (11) is controlled by the control device and interlocked with the main motor (12). The drive device for a twin-screw extruder according to claim 6,
In the series connection of the two different motors (11, 12) or the both ends connection of the input shaft (20) of the speed reducer and the control device (90) for the sub motor, the main motor (12) is started. A drive device for a twin-screw extruder, characterized in that it has a start-up method with reduced current. In the drive method for a twin-screw extruder, in which a main motor (12) and a sub motor (11) having different rated output and characteristics from the main motor are connected in series, and the driving force is transmitted to the reduction gear (13).
When discharging the resin in the twin screw extruder, the secondary motor (11) is driven to transmit the driving force of the secondary motor (11) to the output shaft of the twin screw extruder, and
Electricity that makes it possible to adjust the output and the number of rotations generated by the sub motor (11) when the main motor (12) and the sub motor (11) are connected in series or at both ends of the input shaft (20) of the reduction gear. Drive device for a twin-screw extruder, characterized in that an auxiliary control device (90) is provided, and the sub-motor (11) is controlled by the control device and interlocked with the main motor (12). In the drive method for a twin-screw extruder, in which a main motor (12) and a sub motor (11) having different rated output and characteristics from the main motor are connected in series, and the driving force is transmitted to the reduction gear (13).
When discharging the resin in the twin screw extruder, the secondary motor (11) is driven to transmit the driving force of the secondary motor (11) to the output shaft of the twin screw extruder, and
Regarding the connection arrangement of the main motor (12) and the sub motor (11) and the reduction gear (13) that can be connected in series, the main motor (at the end of one of the input shafts (20) of the reduction gear (13)). 12) and a secondary motor (11) connected to the other end to transmit the driving force,
Furthermore, in the serial connection of the main motor (12) and the sub motor (11) or the both ends connection of the input shaft (20) of the speed reducer, the output and the number of rotations generated by the sub motor (11) can be adjusted. A drive method for a twin-screw extruder, characterized in that an electrical control device (90) is provided, the sub-motor (11) is controlled by the control device and interlocked with the main motor (12). The drive method for a twin-screw extruder according to claim 9,
In the series connection of the two different motors (11, 12) or the both ends connection of the input shaft (20) of the speed reducer and the control device (90) for the sub motor, the main motor (12) is started. A drive method for a twin-screw extruder, characterized in that it has a start-up method with reduced current.

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