JPS62215022A - Driving of spinning machine - Google Patents

Abstract

PURPOSE:To make it possible to carry out synchronous stop of operation parts having different moments of inertia, by regeneratively starting a motor of an operation part having the maximum moment of inertia in power failure and using the regenerative electric power as a driving power source for other motors. CONSTITUTION:Motors (M1)-(M3) are provided for respective operation parts to facilitate the change of driving speed ratio of respective operation parts (C1)-(C3) of a spinning machine in preparation for diversified small-lot production. In such a spinning machine, the motor (M1) for driving an operation part having the maximum moment of inertia is made operable as a generator. In power failure, the motor (M1) is operated as the generator to drive the other motors (M2) and (M3) and carry out synchronous stop.

Description

[Detailed Description of the Invention] [t] Purpose of the Invention (Industrial Application Field) The present invention relates to a method for driving a spinning machine, and more specifically, it relates to a method for driving a spinning machine. This invention relates to a method for driving a spinning machine driven by a separate motor during a power outage.

(Prior Art) Spinning machines such as roving frames, spinning frames, and card spinning machines generally have a plurality of drive units that play different roles, and each drive unit operates in synchronization with each other, especially when starting and stopping. Therefore, a method is adopted in which a plurality of drive units are mechanically connected and driven by a gear transmission mechanism, a belt transmission mechanism, etc. However, in a device in which each drive section is connected and driven by a gear transmission mechanism, etc., when changing the drive speed ratio of each drive section by changing the spinning strip 1'1, etc., it is necessary to replace the change gear. There is an inconvenience in that it takes time and effort to change the spinning conditions, and this inconvenience is particularly noticeable in today's world where high-mix, small-lot production is required. Therefore, we configured the multiple drive units to be driven and controlled by separate motors, and when changing the spinning conditions, there is no need to replace the engine gear. By electrically changing the control signal of each drive motor, each Devices have been proposed in which the speed of the drive is varied.

(Problems to be Solved by the Invention) In a device in which each drive unit is driven and controlled by a separate drive motor, when power to each drive motor is stopped due to an abnormal situation such as a power outage, each drive The parts are stopped at various intervals, and there is an inconvenience that thread tearing, sliver breakage, etc. occur when stopping or restarting. In order to eliminate this inconvenience, Japanese Patent Laid-Open No. 60-246826 published on December 6, 1985 proposes an emergency power supply device with an emergency current battery for spinning machines or twisting machines equipped with separate drive motors. A device has been proposed in which the power source of the drive motor is switched to an emergency power supply device and stopped in the event of a power outage, etc., and each drive RB is operated synchronously until it stops. However, this J: sea urchin uses a battery as an emergency power source! One disadvantage is that the battery becomes larger.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a plurality of drive parts that need to stop operating in synchronization with each other when stopped are configured to have different moments of inertia i. The system is divided into multiple drive systems (each of which is driven by a separate drive motor), and in the event of a power outage, a speed command is given to the drive motor of the drive system with a large moment of inertia to decelerate faster than the deceleration due to inertia rotation. A method was adopted in which the drive motor acts as a generator, the regenerated power from the drive motor is used as a power source for other drive motors, and each drive system is stopped in a synchronized state.

(Operation) In the present invention, a plurality of drive systems having different moments of inertia are each driven by separate drive motors. In the event of a power outage, the motor that drives the drive system with the largest moment of inertia is regeneratively braked, and the regenerated power is used as a power source for other drive motors. are stopped in a synchronized state, thereby preventing thread breakage, sliver breakage, etc.

(Example) An example in which the present invention is embodied in a ring spinning machine will be described below with reference to the drawings. In this embodiment, the drive system of the ring spinning machine is divided into three parts: a spindle drive system 1, a draft part drive system 2, and a lifting part 1 to 3 drive system, and each drive system has a separate drive motor M.
1. M2. It is designed to be driven by M3. Each of the drive motors M1 to M3 is a squirrel cage motor whose drive is controlled via a control device C1 to C3 which is a variable frequency power supply device such as an inverter.
The power supply is connected to the converter 4 and each control bag δ
Smoothing capacitor 5'c' connected in parallel with 01 to C3
It is supposed to be flattened out.

In order to operate each of the motors M1 to M3 synchronously when starting and stopping, the spindle drive motor M1 and the trough drive motor, -
1. Rotation detectors 6 and 7 such as tacho generators are attached to each drive motor M2 to detect the rotation speed of its output shaft, and the detection signal of the rotation detector 6 to detect the rotation speed of the spindle drive motor M1 is is input to the control bag ff1c2, and a detection signal from the rotation detector 7 that detects the rotation speed of the draft part drive motor M2 is input to the control device C3. Further, a power abnormality detector 9 is connected between the converter 4 and the switch 8 to detect a power outage or the like.

The control device C1 that controls the spindle drive motor M1 has an integrator 10 and an amplifier 11 connected in series, as shown in FIG. A power failure signal generation circuit connected at the end point 13 is provided.

Further, each spindle drive system 1, draft part drive system 2, and lifting part drive system 3 are each equipped with an electromagnetic brake (not shown), and the electromagnetic brake and the control power supply for each control device C1 to C3 are operated during a power outage. It can be switched to an emergency power source such as a battery.

Next, the operation of the device configured as described above will be explained. The switch 8 closes in response to an operating command from the machine, and DC power is supplied to each of the control devices C1 to C3 through the converter 4. −
The normally open contact 14 of the force control device C1 is closed at the same time as the operation command, and a linear override signal is generated by the integrator 10 and amplified by the amplifier 11, which activates the inverter to rotate the motor M1 and drive the spindle. System 1 is driven. The rotation of the motor M1 is detected by the rotation detector 6, and the detection signal is sent to the control device C2 of the draft part driving motor M2.
The control device C2 drives and controls the motor M2 so that the draft part drive system 2 rotates at a speed synchronized with the spindle drive system 1. Further, the rotation speed of the motor M2 is detected by the rotation detector 7, and the detection signal is inputted to the control Vt position C3 of the lifting part 1-driving motor M3, and the lifting part 1-drive system 3 is connected to the draft part drive system 2. The control device C3 drives the motor M3 in synchronization with the motor M3. Therefore, each drive system 1-3 is driven in a synchronized state.

When the machine is stopped under normal conditions, the normally open contact 14, which had been kept closed until then, is opened by the machine stop command, and the output of the integrator 10 is as shown by the broken line in FIG. The rotational speed decreases linearly, and based on the signal, the spindle drive motor M1 gradually decreases its rotational speed and stops. and another control device c2. C3 also has rotation detector 6
, 7 decreases in proportion to the output of the integrator 10, the draft part drive motor M2 and lifting part 1 to drive motors M3 are stopped in a synchronized state.J: Sea urchin drive do.

Next, I will explain about stoppages in abnormal situations such as power outages. When the power supply from the normal power supply is stopped due to an abnormal situation such as a power outage, the power supply abnormality detector 9 is activated, and its normally open contact 15 closes, and the normally open contact 14, which had been closed until then, opens. Then, the linearly decreasing output voltage from the integrator 10 and the voltage set by the step setter 12 are subtracted at the addition point 13 and input to the amplifier 11. A voltage lowered by the setting value of the step setting device 12 is output. As a result, the spindle drive motor M1 receives a command below the inertial rotation speed, so the motor M1 acts as a generator to generate regenerative power, and the regenerated power is returned to the smoothing capacitor 5 through the flywheel diode and controlled as a DC power source. It is supplied to devices C2, C3 and motors M2 and M3. Therefore, even after a power outage, the rotational speeds of the motors M1 to M3 gradually decrease in synchronization with each other. As the rotational speed of the spindle drive motor M1 decreases, the regenerative power generation decreases, and when the rotational speed falls below a certain level, other motors 2. Since sufficient power cannot be obtained to drive and control M3, the electromagnetic brakes installed in each drive system 1 to 3 are activated when the rotation speed of the spindle drive motor M1 falls below a predetermined rotation speed, and the drive control is activated. The system stops. The power source for the electromagnetic brakes is an emergency power source, but since each electromagnetic brake is activated when the rotational speed of each drive system becomes extremely low, the package is small and the power source used for it can also be small.

In addition, in the case of a ring spinning machine, the moment of inertia of each drive system is the largest in the spindle drive system and the smallest in the lifting drive system, so when the brake is not applied and the moment of inertia of each drive system is stopped after the regenerative power generation ω has decreased and the motor is stopped by inertia rotation, Since the spindle stops at the end, the yarn is twisted more than a predetermined amount, but as long as twist breakage does not occur, forced braking using the 1261i brake is not necessarily necessary.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, instead of dividing the drive system of a ring spinning machine into three parts as described above, the draft part portion may be divided into smaller parts (
The spindle and draft part drive systems are one drive system and the lifting part is a separate drive system, or other spinning machines other than ring spinning machines, such as twisting machines, roving frames, oven-end spinning machines, card spinning machines, etc. It is also possible to apply

Effects of the Invention As detailed above, according to the present invention, when a plurality of drive units are driven by motors with different rotations in order to facilitate changes in the operating conditions of a spinning machine, emergencies such as power outages can be avoided. Even at times, it is possible to bring each drive unit into a stopped state in synchronization with each other by simply neglecting the minimum non-78 power supply such as a control power supply, so thread breakage or sliver breakage can be reliably prevented. This has the advantage of allowing the machine to be restarted immediately once it returns to normal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention in a ring spinning machine, FIG. 2 is an electric circuit diagram of the main part of the control device,
FIG. 3 is an M diagram showing changes in control signal voltage. Spindle drive system 1, draft part drive system 2, lifting part drive system 3, rotation detector 6.7, power supply constant detector 9, step setting device 12, motor M1°M2. M3゜Patent Applicant Inde Automatic Ti Machine Manufacturing Co., Ltd. Attorney Hironobu Onda Figure 1 Academic Contact

Claims (1)

[Claims] 1. In a spinning machine having a plurality of drive parts that are required to stop operating in synchronization with each other when stopped, the drive parts are divided into a plurality of drive systems having different moments of inertia, and each drive system is separately operated. The drive motor is driven by a drive motor, and during a power outage, a speed command is given to the drive motor of the drive system with a large moment of inertia to decelerate faster than the deceleration due to inertia rotation, so that the drive motor acts as a generator, and the drive motor acts as a generator. A spinning machine driving method that uses the regenerated power of the motor as a power source for other drive motors and stops the drive system in a synchronized state. 2. The method for driving a spinning machine according to claim 1, wherein each of the drive motors is an induction motor driven by an inverter.