JPH028152A - Stopping device for rotation of winder - Google Patents

Abstract

PURPOSE:To surely stop rotation without causing a package collapse by stopping by applying negative phase and mechanical brakings after gradually reducing the number of rotations by regenerative braking in case of stopping the rotation of the winder of a synthetic fiber yarn. CONSTITUTION:When a yarn guard work is completed, a controller 6 starts the operation of a winding control circuit, adjusting the output corresponding to a control signal and reducing the output frequency of an invertor 5 according to the winding thickness of a yarn. In case of reaching the specified winding amt. a stopping push button switch is turned OFF. The lower from a variable frequency power source 7 is fed to a motor 2 by this operation, a braking torque is acted on the motor 2, the rotation speed is reduced and the rotation energy is regenerated to the power source. After stopping of the regeneration braking for the motor 2 a solenoid contactor is actuated with a timer operation and a negative phase braking is acted on the motor 2. The rotary speed is further reduced and when the negative phase braking is stopped, electric braking is made not to be acted. Thereafter, the rotation of a spindle is stopped by actuating a mechanical braking device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for stopping rotation of a spindle in a winding machine used for winding synthetic fiber yarn.

(Prior art and its problems) Generally, in order to improve productivity, synthetic fiber yarn manufacturing equipment attaches multiple bobbins to one spindle and winds multiple yarns simultaneously at high speed. Winding machines that are directly connected to a driving electric motor or winding machines in which a spindle is rotated by a driving roller have come to be used.

Therefore, a natural vibration rotational speed exists below the winding rotational speed of the yarn.

On the other hand, many spindle rotation stop devices for winding machines use a mechanical braking force, in which a brake drum is attached to the spindle, and a brake shoe is pressed against the drum to apply braking force to stop the rotation. , especially when winding large threads or bulky processed threads.
The time from the start of winding to full winding becomes shorter, and the number of start and stop operations increases. As a result, the amount of wear on the brake shoes increases, and there are problems in that the pressing force of the brake shoes must be adjusted frequently in order to keep the braking time constant, and the brake shoes must be replaced frequently.

Therefore, the above-mentioned problem is solved by stopping the rotation using two types of strong and weak electric braking force and mechanical braking force as described in Japanese Patent Application Laid-Open No. 61-211276.

However, in the above method, the timing of switching from a weak electric braking force to a strong electric braking force is uniquely determined by the frequency of the commercial power source.

Therefore, if you simply gradually reduce the spindle rotation with a weak electric braking force and then switch to a strong electric braking force, the electric When the speed is gradually reduced by the braking force, the amount of vibration of the spindle is amplified,
This causes the yarn layer to shift and cause the package to collapse. If the braking time using extremely weak electric braking force is shortened in order to prevent the package from collapsing due to this natural vibration, braking will be applied rapidly at high speed, resulting in problems such as package collapse, occurrence of chrysanthemums, and worn out brake shoes. occurred.

(Episode 11) The present invention provides a method for stopping the rotation of a spindle that does not cause package collapse and can reduce the amount of wear on a mechanical braking device.

(Means for Solving the Problem) That is, in the present invention, when stopping the rotation of the spindle, first, the rotation speed of the spindle is gradually reduced by the first braking force, and the rotation speed is set to the natural vibration rotation speed. This objective is achieved by switching to control using the second braking force and abruptly stopping the rotation of the spindle when the vehicle approaches the target area. In addition, the above-mentioned first braking force may be an electric braking force, and the second braking force may be a mechanical braking force, an electric braking force, or a combination of both to ensure that the objective is achieved. I can do it.

(Example) A control circuit for a winding machine for implementing the method of the present invention will be described based on the drawings.

2 is a spindle for mounting the winding bobbin 11, and is connected to the output shaft of the electric motor 2.

The motor is an induction motor or a synchronous motor.

3 is a mechanical braking device connected to the electric motor 2, and 4 is a speed detector attached to the output shaft of the electric motor 2. 5 is an inverter for rotationally driving the electric motor 2, and 6 is a controller. 7 is a variable frequency power supply, and 8 is a power supply switch. 9 is a sequence circuit, and 10 is a compressed air supply circuit.

A block diagram of the brake control section of the above-mentioned controller 6 is shown in FIG.

12 is a frequency-voltage converter that converts the frequency signal from the speed detector 4 into a voltage signal. 13 is an amplifier for the voltage signal, and 14a and 14b are output relays 17a and 17b.
This is a setting device that determines the operating point. Reference numerals 15a and 15b are electronic devices, and reference numerals 16a and 16b are relay driver circuits.

A detailed diagram of the sequence circuit 9 is shown in FIG.

18a is a stop push button switch, and 18b is a start push button switch. 19a to 19e are auxiliary relays, and 20a to 20C are timers.

21 is an indicator light, and 22a to 22C are electromagnetic contactors. 23 is a solenoid valve, and 24 is a motor heating protection contact. 17a and 17b are output relay contacts of the controller 6, and 25 is a limit switch.

The main control circuit diagram of the electric fi2 is shown in FIG.

A detailed schematic diagram of the mechanical braking device 3 is shown in FIG.

30 is the output shaft of the electric motor R1, and 31 is a brake drum fixed to the shaft. A brake arm 32 is rotatably mounted on a machine base (not shown) via a pin 34, and a brake shoe 33 that abuts the brake drum 31 is fixed to the end of the brake arm. 35 is the brake arm 32
36 is a spring attached to the end of the brake arm 32.

The compressed air supply circuit diagram of the mechanical braking device is shown in FIG.

26 is a logic element, and 27 is a pressure reducing valve. 23 is a solenoid valve, and 28 is a pressure gauge.

The operation of the winder described above will be explained.

First, settings are input so that the inverter 5 outputs power at a frequency corresponding to the operating speed of the spindle 1, and the output frequency of the variable frequency power source 7 is set based on the natural vibration rotation speed of the spindle.

The above-mentioned switching timing from regenerative braking to anti-phase braking differs slightly depending on the vibration characteristics of the spindle, the center of gravity of the winding package, etc., but when the spindle rotation speed is about 1.2 to 2 times the natural vibration rotation speed, Set it to occur when the rotation speed is reached. If the rotation speed is set lower than that, the amount of yarn winding,
Because there is an error in the spindle rotation speed, etc., the amount of vibration increases when it enters the natural vibration rotation range, causing a loss of balance, and conversely, when a mechanical braking force that exceeds this is applied, the brake shoes, etc. may wear out. The amount becomes larger.

Therefore, it is preferable to set the switching timing to a rotational speed approximately 1.2 to 2 times the natural vibration rotational speed.Next, the starting push button switch 18b is turned on. At this time, since the spindle 1 is in a stopped state, the output relay contacts 17a and 17b of the controller 6 are in an OFF state, and the relay 19C1 and timer 20c are operated.

Therefore, relay 19a operates and simultaneously maintains the circuit.

When the contact of the relay 19a is turned ON, the electromagnetic contactor 22a operates, and the output of the inverter 5 is connected to the electric motor 2, so that the electric motor 2 is started.

The output frequency of the inverter 5 is controlled by a slow start circuit (not shown) of the controller 6 and gradually increases up to the set operating speed, so the electric motor 2 is accelerated and reaches the initial speed.

When the electric motor 2 rotates, the frequency signal detected by the speed detector 4, the voltage signal output from the frequency-voltage converter 12, and the voltage signal (VB) output from the amplifier 13 become high. The voltage signal (VB) and the voltage signal (VSl) output from the setter 14a are compared by the comparator 15a, and
B) When it becomes VS1, a voltage signal is input from the comparator 15a to the relay driver circuit 16a, and the relay driver circuit 16a operates the output relay 17a.

When the rotation speed further increases, the voltage signal (VS2) output from the setting device 14b and the voltage signal (yB) output from the amplifier 13 are compared by the comparator 15b, and the voltage signal (VB)VS
2, a voltage signal is input from the comparator 15b to the relay driver circuit 16b, and the voltage signal is inputted from the comparator 15b to the relay driver circuit 16b.
b operates output relay 17b. While the electric motor 2 is being accelerated to the set rotational speed in this manner, the output relay contacts 17a and 17b of the controller 6 are sequentially turned on.

After the spindle 1 reaches the initial rotation speed, the timer 208
When the timeout occurs, the contact 20a turns ON and the indicator light 21 lights up, indicating that the preset initial rotation speed has been reached.

The operator confirms that the indicator light 21 is on and starts threading.

When the threading operation is completed, the controller 6 starts operation of the winding control circuit (not shown) using the thread presence signal contact (not shown), and adjusts the output in response to the control signal (tension or speed). , the output frequency of the inverter 5 is decreased as the yarn becomes thicker.

When a predetermined winding amount (usually time management) is reached, the stop push button switch 18a is turned OFF, and the relay contacts 19a,
and turn off the contact 22a of the electromagnetic contactor. As a result of this operation, the supply of power from the inverter 5 to the electric motor 2 is stopped, and when the timer 20b is activated and a preset time (timing adjustment time for power supply switching) has elapsed, the contact 20b of the timer becomes ONL. The electromagnetic contactor 22b operates. By this operation, power from the variable frequency power supply 7 is supplied to the electric motor 2 via the contact 22b of the electromagnetic contactor.

When the electric power is supplied to the electric motor 2, since the electric motor 2 is rotating at a rotational speed in the power generation range, a braking torque is applied to reduce the rotational speed. At this time, rotational energy is regenerated to the power source. A frequency signal detected by the speed detector 4 due to this operation, a voltage signal output from the frequency-voltage converter 12,
And the voltage signal (VB) output from the amplifier 13 becomes low. The voltage signal (VB) and the voltage signal (VS2) output from the setter 14b are compared by the comparator 15b, and the voltage signal (VB) is
<VS2, the voltage signal from the comparator 15b is no longer supplied to the relay driver circuit 16b, and the relay driver circuit 16b stops the operation of the output relay 17b.

When the operating point of the output relay 17b is set to a speed slightly faster than the synchronized speed of the frequency of the variable frequency power supply, the timer 20b turns OFF at this speed and the contact 22b of the magnetic contactor is turned off.
is turned off, and regenerative braking of the electric motor 2 is stopped.

Simultaneously with this operation, the timer 20c operates, and when a preset time (timing adjustment time for switching the power phase from forward rotation to reverse rotation) has elapsed, the contact of the timer 20c is turned on and the electromagnetic contactor 22C operates. When the electromagnetic contactor 22C operates, the electric motor 1fi2 is connected to the opposite phase through the contact of the electromagnetic contactor 22C. Therefore, braking torque is applied again and the rotational speed is reduced. As the rotation speed further decreases, the voltage signal (VSl) output from the setting device 14a is compared with the voltage signal (VSl) in the comparator 15a, and when VB<VSI, the voltage signal is no longer supplied from the comparator 15a to the relay driver circuit 16a, and the Relay driver circuit 16a stops operation of output relay 173.

The operating point of the output relay 178 is set at around 10 Hz. At this speed, the relay 19b is turned off, the electromagnetic contactor 22C is turned off, the reverse phase braking is stopped, and the electric braking is no longer activated.

On the other hand, in the mechanical braking device 3, the relay 198 is turned off, the traverse device (not shown) is moved, and the limit switch 25 is operated.

When the speed decreases and relay 17a turns OFF, relay 1
Since 9C turns on, relay 19d operates and solenoid valve 2
In order to switch between the three passages, the logic element 26 operates and the air cylinder 35 is supplied with compressed air at a pressure adjusted by the pressure reducing valve 27 to apply the braking force. When compressed air is supplied to the air cylinder 35, the piston rod protrudes and presses the brake shoe 33 attached to the brake arm 32 against the brake drum 31, thereby exerting a braking force.

When the traverse device (not shown) moves to a predetermined traversing position before starting the spindle l, the mechanical braking device 3 operates the limit switch 25 and turns off, so that the relay 19d and the solenoid valve 23 are turned off. , and the logic element 26 are also turned off, the supply of compressed air to the air cylinder 35 is stopped, and the air cylinder 35
The compressed air inside is released.

When the supply of compressed air is stopped and the compressed air in the air cylinder 35 is released, the brake arm 32 is rotated by the elastic force of the spring 36, the brake shoe 33 is separated from the brake drum 31, and the braking force is released.

The present invention can be carried out not only with a winder having one spindle as described above, but also with a revolving type winder in which a plurality of spindles are mounted on a rotating disk, and the spindle is rotated by a drive roller. It can also be implemented with a friction type winder.

The power supply device for electric braking can of course supply the same voltage to the positive phase and negative phase with one variable frequency power supply as in the embodiment, but it can also supply the same voltage to the positive phase and negative phase by using two variable frequency power supplies. Optimal voltages can also be supplied to the opposite phases. Further, it is also possible to perform only regeneration control using the positive phase.

The timing of switching from the first braking force to the second braking force is determined by detecting the number of rotations of the spindle and comparing it with a preset number of rotations, and performing the switching when the number of rotations matches, or by using a timer. You can also do that.

(Effects of the Invention) As described above, when stopping the rotation of the spindle, the present invention first uses the first braking force to gradually reduce the rotation speed of the spindle until the rotation speed approaches the natural vibration rotation speed range. By switching to control using the second braking force and abruptly stopping the rotation of the spindle, the spindle can be stopped reliably without package collapse, and the braking force at high speeds can be reduced. Therefore, it is possible to prevent the package from curling up.

In addition, by setting the first braking force to an electric braking force and the second braking force to a mechanical braking force, or a mechanical braking force and an electric braking force, the mechanical braking force can be applied only at low speed rotation. This reduces the wear and tear on the brake shoes.

Furthermore, when regenerative braking is applied with electric braking force, the rotational energy of the spindle can be regenerated into the power source, resulting in an energy saving effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a winding machine for carrying out the method of the present invention. FIG. 2 is a block diagram of the brake control section of the controller. FIG. 3 is a detailed diagram of the sequence circuit. FIG. 4 is a main control circuit diagram of the electric motor. FIG. 5 is a schematic diagram showing one embodiment of the R mechanical braking device. FIG. 6 is a compressed air supply circuit diagram of the mechanical braking device. FIG. 7 is a schematic diagram showing the driving operation. FIG. 8 is a characteristic diagram showing the relationship between torque and rotational speed during braking of the electric motor.

Claims (1)

[Claims] 1) When stopping the rotation of the spindle, first, the number of rotations of the spindle is gradually reduced by a first braking force,
A method for stopping the rotation of a winding machine, characterized in that when the rotation speed approaches a natural vibration rotation speed range, control is switched to a second braking force to abruptly stop the rotation of the spindle. 2) The method for stopping rotation of a winder according to claim 1, wherein the first braking force is an electric braking force and the second braking force is a mechanical braking force. 3) The method for stopping rotation of a winder according to claim 1, wherein the first braking force is an electric braking force and the second braking force is an electric braking force. 4) The method for stopping rotation of a winder according to claim 1, wherein the first braking force is an electric braking force, and the second braking force is a mechanical braking force and an electric braking force.