JPS597615A - Control circuit for synchronized operation of conveyor - Google Patents

Abstract

PURPOSE:To perform synchronized operation of two conveyors when a work is delivered between the two conveyors disposed in series, by outputting a synchronous timing signal through finding of the synchronous timing by means of a synchro control part, a synchronizing signal and a phase discriminating signal therefrom. CONSTITUTION:With motors 4 and 4' for conveyors 1 and 2, respectively, run, the conveyors 1 and 2 are independently driven to deliver a work on the second conveyor 2 to the first conveyor 1 at intervals of a given pitch for conveyance. During synchronizing operation between the first and second conveyors 1 and 2, even if for example, the second conveyor stops operating due to failure in operation, the first conveyor 1 continues to operate at the speed corresponding to the set number of revolutions of a first speed control part 6 through running of the first motor 4 irrespective of the failure in operation. In which case, a synchronizing signal, periodically changing in response to the movement of the work on the first conveyor 1, and a phase discriminating signal are outputted from a synchro-control part 9, and a contact 12a of a speed output part 12 is in an open state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a synchronous operation control circuit for a conveyor in which two independently driven conveyors are arranged in series and workpieces are delivered and conveyed between the conveyors. .

Conventionally, in this type of conveyor, in order to ensure that workpieces are transferred between both conveyors, for example, when a workpiece on one conveyor reaches the workpiece transfer position, a hanger for hanging the workpiece on the other conveyor is moved. It is necessary to be able to position it at the workpiece delivery position. To avoid this, after matching the synchronous positions of both conveyors with each other, both conveyors are started to operate simultaneously, and the operation of both conveyors is controlled to be in a synchronous operation state based on the synchronous signal of the synchronous operation control circuit. I have to.

However, during synchronized operation of both conveyors, if one conveyor stops due to a failure or as necessary, in order to keep the synchronized positions of both conveyors corresponding to each other, it is necessary to immediately stop the other conveyor. Alternatively, after operating the other conveyor to a predetermined point and stopping it, it is necessary to operate the one conveyor independently to a point corresponding to the predetermined point after restoration. Therefore, there is no degree of freedom in operation between the conveyors, and when one conveyor stops, the operating rate of the other conveyor decreases. -! In addition, when the other conveyor corresponds to a conveyor in a painting line, for example, there is a drawback that the quality of the workpieces deteriorates due to the temporary stop of the conveyor.

In view of this, the present invention detects the electrical phase difference between the synchronized positions between both conveyors to generate a phase discrimination signal, and based on this phase discrimination signal and the conventional synchronization signal, the workpiece By determining when to start synchronized operation to ensure delivery and conveyance, even if one conveyor stops when both conveyors are in synchronized operation, the other conveyor continues to operate without being forced to stop. In addition, one of the conveyors mentioned above can be restored and operation can be resumed.
For example, the purpose is to automatically determine when to start synchronous operation and to start synchronous operation.

In order to achieve the object, the present invention provides a synchronous operation control circuit for a conveyor in which two independently driven conveyors are arranged in series, and works are delivered and conveyed between the conveyors. A synchro transmitter that electrically detects the conveyance position; a synchro control unit that receives the conveyance position signal from the synchro transmitter and outputs a synchronization signal and phase discrimination signal between both conveyors; and a synchronization signal of the synchro control unit. a position control section that converts the synchronization signal into a speed signal; a synchronization detection section that determines synchronization timing using the synchronization signal and phase discrimination signal of the synchronization control section and outputs the synchronization timing signal; and a synchronization detection section that receives the synchronization timing signal of the synchronization detection section. and a speed control unit that outputs the speed signal of the position control unit to the driving means of the other conveyor, and when both conveyors are operated simultaneously by restarting operation of one conveyor, when the synchronization timing comes, the synchronization detection unit A speed signal corresponding to the synchronization signal from the position control section is inputted to the drive means of the other conveyor in response to the output of the synchronization timing signal from the position controller, thereby starting the synchronized operation of both conveyors.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 1 is a first conveyor, 2 is a second conveyor arranged in series with the first conveyor 1, and each conveyor 1, 2 carries a workpiece (not shown). The first motor 4 is connected to the driving boob IJ la of the conveyor 1 (1) via the first electromagnetic clutch 6, and the second conveyor 2 is similarly driven to the left side in the figure. Boo I
Second motors 4' are respectively connected to 72a via second electromagnetic clutches 6'. The second conveyor 2 is configured to repeatedly deliver and convey works (not shown) to the first conveyor 1 at predetermined pitch intervals. In addition, each of the above motors 4, 4
', the rotational speed of the motors 4, 4' is preset based on the mold pressure signal of the speed detection generator 5゜5' which converts the rotational speed of the motors 4, 4' into a voltage signal. First and second speed control sections 6 and 6' are connected to each other, and each speed control section 6
, 6' control the rotation speed of each motor 4, 4' to drive each conveyor 1.2 at a predetermined speed. Incidentally, reference numeral 7 denotes a speed setting section for manually setting the set rotational speed of each speed control section 6, 6'.

Further, 8 is a driven booby IJ 1 of the first conveyor 1.
t) electrically detecting the conveyance position of the workpiece (not shown) on the first conveyor 1 based on the rotation;
Reference numeral 9 denotes a synchronization control section which is an important part of the present invention, and the synchronization control section ν receives the conveyance position signal from the synchronization transmission section 8 described in -FZ, and performs the synchronization control section ν as shown in FIG. 2 (a). 1st
A synchronization signal in the form of a sine curve whose cycle is a time t corresponding to the conveyance pitch of the workpiece (not shown) on the conveyor 1 is output, and a synchronization signal in the form of a sine curve is output based on the rotation of the drive pulley 2a of the second conveyor 2. The work on the second conveyor 2-hi (
2 (not shown) is electrically detected, and the electrical phase difference between this transport position signal and the transport position signal from the /ncro transmitter 8 is extracted as an alternating voltage. )
It outputs a cosine curved phase discrimination signal as shown in FIG. Further, 10 is a position control unit that receives a synchronization signal from the synchronization control unit 9 and converts it into a speed signal, and the speed signal of the position control unit 10 is sent to a second speed control unit via a speed output unit 12 (described later). By outputting the output to the section 6', the second control section 6' synchronizes the second motor 4' with the first motor 4, so that the operation of the second conveyor 2 is synchronized with the operation of the first conveyor 1. I try to let them do it.

Further, 11 is a synchronization detection section that receives a synchronization signal and a phase discrimination signal from the synchronization control section 9, and the synchronization detection section 11 is configured such that the synchronization signal has a substantially zero value and the phase discrimination signal has a value of ten. When the maximum value is reached, that is, the first conveyor 1
When the upper workpiece (not shown) is at the takt start position and the workpiece (not shown) on the second conveyor 2 is in a synchronized position with the workpiece (not shown) on the first conveyor 1. It is so named because it detects the discrimination and determines that it is synchronization timing/mink time, and outputs a synchronization timing signal at the same time. In addition, 12 is a signal path 1 from the position control section 10 to the second speed control section 6'.
The speed output section 12 has a normally open contact 12a interposed in the synchronous detection section 6, and the contact 12a closes upon receiving the synchronization timing signal from the synchronization detection section 11. At the timing, the speed signal of the position control section 10 is transferred to the second speed control section 6' by opening the contact 12a.
The rotation speed of the second motor 4', which is a driving means for the second conveyor 2, is controlled so as to be synchronized with the first motor 4.

Next, to explain the operation of the above embodiment, during synchronized operation of the first and second conveyors 1 and 2, for example, if the second conveyor 2 stops due to a failure, the first conveyor 1 The rotation of the first motor 4 causes the first
The engine continues to be operated at a speed corresponding to the set rotational speed of the speed control section 6. At this time, the synchronization control unit 9 outputs a synchronization signal (see FIG. 2 (a)) that changes periodically as the workpiece (not shown) on the first conveyor 1 moves, and a phase discrimination signal (see FIG. 2 (a)). b) is output, and the contact 12a of the speed output section 12 is open.

When the second conveyor 2 is restored and restarts its operation, the second conveyor 2 is rotated by the second speed controller 6 independently of the first conveyor 1 by the rotational drive of the second motor 4'. It begins to operate at a speed corresponding to the set rotation speed of ', but at this time, there is a slight speed difference between that operating speed and the operating speed of the first conveyor 1, and both conveyors 1 and 2 are asynchronous. It is in operating condition. Thereafter, when this operating state continues and the phase discrimination signal reaches the maximum value of 10 and the synchronization signal reaches approximately zero value due to the speed difference between the two conveyors 1 and 2, the synchronization detection section 11 outputs a synchronization timing signal. is output, the normally open contact 12a of the speed output section 12 is closed, and the speed signal of the position control section 10 is outputted to the second speed control section 6'.

As a result, at the synchronized timing, the second conveyor 2
The second motor 4' is started to be operated in synchronization with the first conveyor 1 by feedback control of the second motor 4' by the second speed control section 6' which receives the speed signal from the position control section 10.

Therefore, when the first and second conveyors 1 and 2 are operated synchronously, even if the operation of the second conveyor 2 is stopped, the operation of the first conveyor 1 can be continued, and the operation of the second conveyor 2 can be continued. When restarting the operation, the synchronous operation is automatically started at the synchronization timing, so it is easy to start the synchronous operation after trouble recovery, and the operating rate of the first conveyor 1 can be improved. Moreover, in the case where the first conveyor 1 is a conveyor such as a conveyor in a painting line where the quality of the workpieces will deteriorate if it stops in the middle of the work, the predetermined work is completed by continuing the operation of the first conveyor 1a. Therefore, deterioration in the quality of the workpiece can be prevented.

In addition, although the case where the operation of the 2nd conveyor 2 stopped when both conveyors 1 and 2 were synchronously operated was described above, the case where the operation of the 1st conveyor 1 was stopped is also the same as the above.

As explained above, according to the conveyor synchronous operation control circuit of the present invention, when two conveyors arranged in series are operated synchronously, when one conveyor stops operating, the other conveyor continues operating, and then When the operation of one conveyor is restarted and the synchronization timing is reached, both conveyors are automatically started in synchronization without any synchronization deviation, which makes it easy to start synchronization. Therefore, the conveyor operating rate can be improved. In addition, it is possible to prevent the quality of the work from deteriorating as the conveyor continues to operate, which is useful for transferring and transferring the work between conveyors arranged in series.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a general schematic diagram, FIG. 2(A) is a waveform diagram of a synchronizing signal, and FIG. 2(B) is a waveform diagram of a phase discrimination signal. 1..First conveyor, 2..Second conveyor, 4゜4
'... Motor (drive means), 8... Synchro transmitter, 9
... Synchronization control section, 10.. Position control section, 11.. Synchronization detection section, 12.. Speed output section, 12a.. Normally open contact.

Claims (1)

[Claims] +1+ A synchronized operation control circuit for a conveyor in which two independently driven conveyors are arranged in series and workpieces are delivered and conveyed between the conveyors, and a synchronized transmission is used to electrically detect the workpiece conveyance position of one of the conveyors. a synchronizer controller that receives the transport position signal from the synchro transmitter and outputs a synchronization signal between both conveyors and a phase discrimination signal, and a position controller that converts the synchronizer signal from the synchronizer controller into a speed signal. a synchronization detection section that determines synchronization timing using the synchronization signal and phase discrimination signal of the synchronization control section and outputs the synchronization timing signal; and a synchronization detection section that receives the synchronization timing signal of the synchronization detection section and detects the speed signal of the position control section. A synchronous operation control circuit for a conveyor, comprising a speed output section that outputs an output to a driving means of the other conveyor.