JP2006067748A - Tension control method at blackout of sizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sizer capable of applying appropriate tension and stretch to strings, when blackout occurs, and stopping a machine in an approximately usual stop condition in the sizer of a multi-section drive. <P>SOLUTION: Noting that a servo motor, jointed with the respective machine portions of the sizer, has a regeneration mode portion at the time of machine stop and a motor mode portion into consideration, driver DC portions of the servo motor are connected to send/receive power among them, and tension control is performed, in the same way so that it is in a stationary condition of stopping the machine. At this time, power is secured so that the mode becomes a regeneration mode by necessity. For this purpose, deceleration time can be selected, as necessary. Power for a control circuit is set at and less than 1KW, the capacity is small, and it will not cause disadvantages in cost, even if backup is performed by using uninterruptibe power supply, thus improving the stability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a technique for improving a multi-section drive of a sizer, that is, an apparatus for controlling the tension and stretch of each part of a machine by driving each machine part by a single motor.

As a conventional technology, the mechanical drive system using gears and PIV has no problem against power failure. In the recently developed multi-section drive system, a mechanical brake is attached to each machine part, and air from the air tank is sent to this mechanical brake through a pressure regulating valve by an electromagnetic valve that opens in the event of a power failure. The machine was stopped.

However, this method can prevent inertial operation of the machine simply by applying a braking force to the machine part, but it does not control the tension or stretch of the thread, so it will loosen the thread or overtension the thread. The yarn cannot be used as a product. An object of the present invention is to stop the machine in a state close to a normal stop state while giving proper tension and stretch to the yarn when a power failure occurs.

In the present invention, attention is paid to the moment of inertia unique to the sizer, and this energy is used to secure power during a power failure and to stop the machine in a stable state. The sizer has a mechanical braking force, that is, a motor that controls this part is in a regenerative mode, that is, a power generation mode, when the sending part for sending out the warp and the cylinder part used for drying stop the machine.

On the other hand, the feed roll is almost in the state of electric power between the power running mode, that is, the motor mode and the power generation mode, the size roll part is in the motor mode due to the resistance of the glue solution, but the winding beam has high yarn tension. When set to, the power consumption is greater than the inertial energy, and the motor mode is set to consume power. This power is supplied to the part that requires power in the motor mode in the power generation mode part of the sending part and the cylinder part described above, and the machine is stopped in the same manner as in the steady state.

When the machine was stopped, the feed tension, the stretch between the feed roll and the size roll, the stretch between the size roll and the cylinder, and the take-up tension of the take-up beam were stably controlled to improve the yarn quality. Yarn breakage due to tension instability has been eliminated, and the machine operating rate has been improved. A large mechanical brake is no longer necessary, which is advantageous in terms of cost.

FIG. 1 is a side view of the sizer, omitting a sheath, a tension detector and the like not directly related to the present invention. The delivery beam 1 is mechanically connected to the servo motor M1, and the delivery tension is controlled. The warp yarn 3 delivered from the delivery beam 1 passes through a feed portion composed of a pushing roll 4, a feed roll 2 and a mechanically connected servo motor M 2, and passes through a squeeze roll 5, a sizing roll 6 and a servo motor. Glued at the gluing portion composed of M3 and passes through the first drying chamber 7 and the second drying chamber 8 in the hot air drying process.

Further, after passing through the guide roll 9 and passing through the first cylinder 10, the second cylinder 11, the third cylinder 12, the fourth cylinder 13, and the fifth cylinder 14 in the cylinder drying process, the drying process is completed, and the guide roll 15. The warp yarn 3 glued to the take-up beam 17 driven by the servo motor M5 through the length measuring roll 16 is taken up. Although not shown, each cylinder is connected by a chain and driven by a servo motor M4.

FIG. 2 is an electrical control block diagram for controlling the servo motor M1 to the servo motor M5 in FIG. An AC voltage is supplied from a commercial power source to the driver D5, while an AC voltage is also supplied to the uninterruptible power supply 18. The uninterruptible power supply 18 converts alternating current into direct current, reconverts it into alternating voltage through an inverter circuit, and outputs it to the control device 19.

When the commercial power supply voltage and the voltage of the uninterruptible power supply 18 do not match, the voltage is adjusted using a transformer as necessary. The uninterruptible power supply 18 has a built-in battery, and when a power failure occurs, the DC voltage portion automatically switches to the battery voltage and continues to output. The control device 19 is connected to a push button switch and a data setting touch panel not shown.

The control device 19 outputs control signals to the driver D1, driver D2, driver D3, driver D4, and driver D5. Each driver controls the servo motor M1, the servo motor M2, the servo motor M3, the servo motor M4, and the servo motor M5. The power failure detector 20 monitors the voltage of the commercial power supply, and outputs a power failure signal to the control device 19 when the voltage drops below a reference value or when a power failure occurs.

The power source of the driver is selected to have a larger capacity for the rectifier circuit, and the driver D5 is supplied with AC voltage from the commercial power source. The inverter circuit of the driver D5 itself is driven by the voltage converted into the DC voltage through the rectifier circuit, thereby driving the servo motor M5. On the other hand, the other driver D1, driver D2, driver D3, and driver D4 are not connected to the AC circuit, but are connected to the DC circuit. Therefore, the driver supplied with the DC power supply can omit the rectifier circuit.

When a normal voltage is supplied from the commercial power supply in this connected state, the same operation as the conventional one is performed. When the power failure detector 20 determines an abnormality in the commercial power supply and issues a power failure signal to the control device 19, the control device 19 issues a power failure stop signal from each driver M1 to the driver M5 and stops the machine. At this time, the control device 19 is supplied with a voltage from the uninterruptible power supply 18 and performs normal operation.

Accordingly, the power failure stop output signal can be output from the driver D1 to the driver D5. The power lines from driver D1 to driver D5 are connected by a DC circuit. Each driver receives a power failure stop signal from the control device 19 and enters a deceleration state. At this time, the servo motor M1 connected to the feed beam 1 absorbs the tension applied to the warp yarn 3 and the inertial energy of the feed beam 1, so that the regenerative mode is entered and the servo motor M1 becomes a generator, and passes through the inverter circuit of the driver D1. Apply voltage to the DC circuit. Thus, even if there is no DC power supply from a commercial power supply, the voltage of the DC circuit of the driver can be secured.

The driver D4 is also supplied with voltage from the servo motor M4 to the DC circuit by the inertial energy of the cylinder 10 from the cylinder 10. At this time, the servo motor M2 connected to the feed roll 2 has almost no energy. The servo motor M3 connected to the size roll 6 requires electric power in the motor mode due to the resistance of the glue solution, but the DC portion of each driver described above is connected, and steady deceleration with the electric power in the regeneration mode portion. The state can be maintained.

The servo motor M5 connected to the take-up beam 17 has a regenerative mode and a motor mode depending on the tension at which the warp yarn 3 is taken up. In any case, steady deceleration stop is possible. The machine deceleration time due to a power failure is set shorter than the normal deceleration time, and the regenerative power is made larger than the motor power as a whole to prevent power shortage during deceleration.

When the regenerative power is larger than the motor power, the voltage of the DC circuit increases if the voltage cannot be absorbed by the DC circuit capacitor of the driver. At this time, the transistor is discharged to a regenerative resistor (not shown) to keep the voltage of the DC circuit in a certain range. Although it is conceivable to use the DC circuit voltage of the driver as the power source of the control circuit 19, the uninterruptible power supply 18 is employed because of voltage stability.

FIG. 3 is a block diagram of a control circuit in which two drivers, a driver D5 and a driver D4, have a rectifier circuit that converts the alternating voltage of the driver into direct current. The driver D5 of the servo motor M5 and the driver D1 of the servo motor M1 are combined as a combination, and the driver D4 of the servo motor M4, the driver D3 of the servo motor M3, and the driver D2 of the servo motor M2 are combined as another set. Although the connection of the DC circuit is changed, the function is the same as the function described in FIG. 2, and there is an advantage that the size can be reduced by using two rectifier circuits.

FIG. 4 is a machine operation speed curve diagram and shows that when the machine is decelerated and stopped by the machine stop signal, the deceleration stop time by the power failure stop signal is shorter than the normal operation stop. In this case, the mechanical deceleration curve is selected by distinguishing when the normal stop signal and the power failure detector 20 are operated by the control device 19.

The present invention is a multi-section drive that operates a machine with a plurality of servo motors. There are parts with large and small moments of inertia of the machine. When the machine is stopped, there are a regeneration mode and a motor mode, and it is applied to a machine that can be in the regeneration mode as a whole Is possible.

It is a side view of a sizer. FIG. 3 is a control block diagram for controlling a servo motor M5 from a servo motor M1. FIG. 3 is a control block diagram in which the DC circuit of FIG. 2 is modified. Machine operating speed curve

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feeding beam 2 Feed roll 3 Warp thread 4 Pushing roll 5 Squeeze roll 6 Sizing roll 7 1st drying chamber 8 2nd drying chamber 9 Guide roll 10 1st cylinder 11 2nd cylinder 12 3rd cylinder 13 4th cylinder 14 5th cylinder 15 Guide roll 16 Measuring roll 17 Winding beam 18 Uninterruptible power supply 19 Control device 20 Power failure detector D1 Driver D2 Driver D3 Driver D4 Driver D5 Driver M1 Servo motor M2 Servo motor M3 Servo motor M4 Servo motor M5 Servo motor

Claims (3)

In a multi-section drive device that controls each part of the sizer with multiple motors, when stopping the machine due to a power failure, the DC part of the driver that controls each motor is connected in common, and the power running such as the motor of the winding part This is a method that enables power supply from the regenerative side such as the cylinder part to the part that requires power on the side, and stops the machine while maintaining tension control of each part. 2. The method of claim 1, wherein an uninterruptible power supply is used in the control circuit to stabilize the control. 2. The method according to claim 1, wherein when the power failure detector operates, the deceleration time is shorter than the steady deceleration time.

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