JPH05111282A - Synchronous operation driver - Google Patents

Abstract

PURPOSE:To provide a synchronous operation driver in which motors can be restarted after stoppage of single motor without stopping all motors and mechanical synchronizing positions can be aligned smoothly after restart. CONSTITUTION:The synchronous operation driver for a plurality of motors installed at respective sections comprises a preset counter 30 for receiving pulses from a pulse generator PG1 directly coupled with a motor 10 and counting thus received pulses, a counter 31 for receiving pulses from a pulse generator PG2 at next stage and counting thus received pulses, a difference detecting counter 32 for outputting the difference of count between both counters, a circuit 33 for setting upper and lower limits on the output from the difference detecting counter 32, a multiplier 34 for multiplying the output from the limit circuit 33 by a coefficient. an adder for providing the output from the coefficient multiplier 34 as a speed correction signal to a variable speed driver 20 for concerned section, and an operating switch 40 for finely adjusting the speed of motor for concerned section and correcting the position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous driving device for a plurality of electric motors installed as a driving device for a glass product manufacturing apparatus.

[0002]

2. Description of the Related Art A manufacturing apparatus for manufacturing glass products, particularly glasses and tumblers, cuts an appropriate amount of glass melt and supplies it to a plurality of molding machines provided on a rotary table in a timely manner. From the conveyor to the conveyor, pushing from the conveyor to the next molding machine, etc.
It is driven by electric motors provided in each section, and these electric motors must be operated in synchronization.

Conventionally, in the glass product manufacturing apparatus as described above, since it is necessary to operate a plurality of electric motors in synchronization with each other, a synchronous motor (for example, a permanent magnet electric motor) is used as the electric motor, and one motor is used as a common power source for the plurality of electric motors. Variable frequency-variable voltage inverter devices are used.

Further, in a machine for molding glass products, it is difficult to directly attach a sensor such as a position detector to the machine because the whole machine is heated to a high temperature, and the line is stopped once because the melt is handled. Therefore, it takes a lot of time for cooling, heating, etc., and productivity becomes extremely poor. For this reason, there is a method of driving a plurality of electric motors with a common power source,
In this method, the failure of the common power supply causes all lines to stop, so
It is better to prepare the power supply for each individual motor, so that it is possible to respond flexibly in case of failure and change of manufacturing procedure (route).

[0005]

By the way, when a plurality of synchronous motors are driven by the common power supply device as described above, there are the following problems. (1) When one electric motor is stopped due to inspection or accident, when the next electric motor is to be restarted, it is necessary to stop all electric motors once in order to synchronize the operation, which reduces productivity. Become. (2) Similarly, when only one motor is stopped and restarted,
Since the mechanical synchronization position is misaligned, it is necessary to disconnect the mechanical connection such as the clutch after stopping all the electric motors and restart while aligning the mechanical synchronization position.

The present invention has been made to solve the above problems, and an object of the present invention is to enable restarting after stopping one electric motor without stopping all electric motors. It is an object of the present invention to provide a synchronous operation drive device capable of adjusting the mechanical synchronous position to.

[0007]

In order to achieve the above object, the present invention provides a synchronous operation drive device configured to synchronously operate a plurality of electric motors installed in each section of a manufacturing apparatus, wherein the electric motors are With a pulse transmitter directly connected,
A variable speed drive device for varying the speed of the electric motor;
A preset counter that receives and counts pulses from the pulse transmitter, a counter that receives and counts pulses from the pulse transmitter at the next stage, compares the count value of the preset counter and the count value of the counter, and A difference detection counter for outputting a difference, a limit circuit for limiting the output value of the difference detection counter to an upper limit and a lower limit, a coefficient multiplier for multiplying the output of the limit circuit by a coefficient, and an output of the coefficient multiplier for the section concerned. Of the variable speed drive device, and an operation switch for finely adjusting the motor speed of the section to correct the position.

[0008]

First, the preset counter is preset with the number of pulses for one cycle of the mechanical synchronization position, and when the count value reaches the preset value, it is automatically cleared to "0" and restarts counting. The difference between the count value of the preset counter of the preceding section and the count value of the gate counter of its own section can always detect the count difference by the difference detection counter to detect the shift phase of the mechanical synchronization position. When this detected value exceeds a certain amount of +,-, a fixed value is limited, and the count difference is multiplied by a coefficient so that the speed can be corrected by an appropriate amount, and the motor is corrected by the speed correction amount corrected by the appropriate gain. By correcting the velocity, the mechanical synchronization position is corrected to match. By preparing such a control device for a plurality of sections, all sections can be mechanically synchronized.

Further, when the mechanical synchronization position of the preset counter is displaced for some reason, the operation switch provided in each section is selected to the + position or the-position, the motor speed of the section is increased or decreased, and the mechanical speed increases. The position is gradually corrected. When the mechanical position becomes the synchronous position, if the operation switch is set to the neutral position, the preset counter of the preceding stage and its own are cleared to "0", so that the mechanical synchronous position and the electrical synchronous position are completely coincident, and then continuously. The synchronous operation becomes possible.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an embodiment of the present invention. Each section of the machine not shown is driven by an electric motor 10.
The electric motor 10 is operated at a speed according to the speed reference 21 commanded by the variable speed drive device 20. Further, a pulse transmitter 11 is directly connected to the electric motor 10.

The first motor (M ₁ ) 10 in the figure is the master of the line. The signal from the pulse generator (PG ₁ ) 11 attached to the electric motor (M ₁ ) 10 is input to the first master preset counter 30. The signal from the pulse generator (PG ₂ ) 11 attached to the electric motor (M ₂ ) 10 of the second section is the second slave counter 3
Input to 1.

First master preset counter 30
And the count value of the second slave counter 31 are always input to the difference detection counter 32. The count number detected by the difference detection counter 32 is input to the coefficient multiplier 34 through the limiter 33, and the output of the coefficient multiplier 34 is added to the speed reference of the second variable speed drive device 20.

Intermediate sections other than the master section and the final section are slave counters 3
It has two counters, 1 and a preset counter 30 for master. Further, the sections other than the line master section are provided with an operation switch 40, and the operation switch 40 has a three-point switching spring return and has a "deceleration-neutral-acceleration" position.

If the speed increasing position is selected, a small speed increasing reference is added to the variable speed driving device of its own, and conversely, if the speed reducing position is selected, a minute speed decreasing reference is added to the variable speed driving device of itself. In addition, during acceleration or deceleration, the count values of the master preset counter in the preceding stage and the slave counter of itself are stopped as they are, and when the operation switch becomes neutral, "0" is cleared and counting is started again.

Next, the operation of this embodiment will be described.
The mechanical cycle of the first electric motor (M ₁ ) 10 is preset in the first master preset counter 30 by the pulse count number. In addition, the second electric motor (M
₂ ) The mechanical cycle of 10 is preset by the number of pulses in the second master preset counter 30. Similarly, the mechanical cycle of the electric motor of the next stage and thereafter is preset in each master preset counter. Here, the line is operated, the count value of the first master preset counter 30 gradually increases, and when it reaches the preset value, it is cleared to "0" and counting is started again.

Similarly, the count value of the second slave counter 31 also gradually increases, but it does not clear "0" by itself, but clears it at the same time when the first master preset counter clears "0". , Start counting again.

The difference detection counter 32 compares the count value when the first master preset value is reached with the count value immediately before the "0" is cleared by the second slave counter, and calculates and outputs the difference. This output represents the phase difference between the first machine position and the second machine position. This phase difference output is multiplied by the + upper limit or the −lower limit by the limiter 33, and further by the coefficient multiplier 34. Adjust the gain so that the correction amount is obtained. The gain-adjusted correction output is input as the speed correction of the second variable speed drive device 20,
Further, the speed of the electric motor is corrected to + or − with respect to the reference, so that the second mechanical phase gradually approaches the first mechanical phase. By repeating such matching of the first and second pulse numbers during operation, it is possible to obtain substantially synchronous operation.

Further, when the electric motor of a section under operation is stopped, the output of the master preset counter 30 is changed to the next stage after the stop section so that the section to be the master of the subsequent section becomes the section before the stop section. By configuring the switching sequence to input to the difference detection counter of the section, the master section can be switched and the synchronous operation can be continued even if any section stops.

Further, when restarting the operation of the stop section, the speed is increased / decreased by the operation switch while observing the machine position at the time when the speed becomes stable after the start of the stop section (after a lapse of a certain time after start), When the operation switch is returned to neutral at the position, the synchronous operation of itself is started, and at the same time, the input of the master preset counter of the next stage section is switched to the restarted section.

As described above, according to this embodiment,
Synchronous operation can be performed without directly mounting a sensor on the machine for synchronizing multiple sections.
Even if a certain section is stopped during line operation, line synchronous operation is continued, and even when a stopped section is started after starting, it can be started without stopping the line and can be put into synchronous operation. It is efficient and can improve productivity.

Although the above embodiment has been described by using the hardware circuit, the preset counter, the counter, the difference detection counter, the limiter, the gain multiplier, the speed reference, the acceleration / deceleration correction signal and the sequence are replaced with a programmable controller. Of course, you can also do it.

[0022]

As described above, according to the present invention, it is possible to mount a sensor for synchronizing a plurality of sections directly on a machine, unlike a glass product manufacturing apparatus.
Synchronous operation can be performed, and even if a certain section is stopped during line operation, synchronous operation continues as a line, and the line is not stopped even when the stopped section is chased and started. It has the excellent effect that it can be started up and can be put into synchronous operation.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

[Explanation of symbols]

10 ... Electric motor, 11 ... Pulse transmitter, 20 ... Variable speed starting device, 21 ... Speed reference, 30 ... Preset counter, 3
1 ... Counter, 32 ... Difference detection counter, 33 ... Limiter, 34 ... Coefficient multiplier, 40 ... Operation switch.

Claims (1)

[Claims] 1. A synchronous driving device configured to synchronously operate a plurality of electric motors installed in each section of a manufacturing apparatus, for varying a speed of the pulse transmitter directly connected to the electric motor and the electric motor. Variable speed drive device, a preset counter that receives and counts pulses from the pulse oscillator, a counter that receives and counts pulses from the pulse oscillator at the next stage, a count value of the preset counter and the counter A difference detection counter that compares the count values and outputs the difference, a limit circuit that limits the output value of the difference detection counter with an upper limit and a lower limit, a coefficient multiplier that multiplies the output of the limit circuit by a coefficient, and the coefficient An adder circuit that gives the output of the multiplier as a speed correction signal of the variable speed drive device of the section, and the motor of the section. A synchronous operation drive device, comprising: an operation switch for finely adjusting a speed to correct a position.