JPS631304A - Linear motor type carrier equipment - Google Patents

Abstract

PURPOSE:To reduce the number of power and signal lines, by providing a carrier detecting means and a switching means, which turns ON while the carrier is being detected, close to each on the primary coils. CONSTITUTION:A control unit 7 is composed of a drive circuit D connected through a common power line a to each solid-state relay R1Rn and a control circuit 8a to control the action of the drive circuit D. At the moment a carrier 2 reaches above the primary coils M1-Mn and is detected by sensors S1-Sn and detection circuits K1-Kn, solid-state relays R1-Rn turn On in accordance with the output of the detection circuits K1-Kn. And, at the moment the carrier 2 is not detected by sensors S1-Sn and detection circuits K1-Kn, the solid-state relays R1-Rn turn OFF.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a linear motor type conveying device used in factories, warehouses, etc.

"Prior Art" For example, as a transport means in a product assembly transport line, etc., there is a linear motor transport device as shown in Fig. 2, which uses a single-sided linear induction motor (hereinafter abbreviated as LIM) as a drive source. Are known.

In FIG. 2, 1 is a free roller provided along the conveyance path, 2 is a carrier movably supported by rollers 3, 3, etc. of the free roller 1, and loaded with a conveyed object 4. . ~f,,M,... are arranged at predetermined intervals on the conveyance path and are responsible for generating a traveling magnetic field;
M primary coil M1゜M2. . . . are the secondary side conductors of L I M that face each other with a gap above and below. p,p,
,... are each primary coil M of LIM in carrier 2.
,,M2. - A sensor 7 detects reaching the top and passing the carrier, and 7 is a control device that controls the travel of the carrier-2. This control device 7 includes primary coils M, , M, .
...and the power line AI.

Drive circuits DI connected to each other via At, .
.

D! ,... and each of the above-mentioned sensors P , , P , ,...
From signal line B1, B! Based on the detection signals respectively supplied via +..., the drive circuits D , , D , .
. . and a control circuit 8 that controls each operation. Each drive circuit D + , D t , . . . has a voltage adjustment function, and the signal line C from the control circuit 8
+, Ct,..., when a power supply command is supplied via 3-phase AC (3φA) supplied from an external commercial power source.
C) to a preset voltage, and the voltage-adjusted three-phase AC is connected to power lines A1, A2. ... to the primary coils M + , M t , ... through each,
When the power supply command is no longer supplied from the control circuit 8, the supply of three-phase alternating current to the primary coils M + , M t , . . . is stopped.

Then, when the carrier 2 is detected by the sensor P1, the control circuit 8 gives a power supply command to the drive circuit D1,
This allows the primary coil M to be connected via the drive circuit.
, is supplied with three-phase alternating current.

Then, the traveling direction of the carrier 2 (
A traveling magnetic field is generated in the same direction as the direction of the arrow shown in the figure, and thrust is applied to the secondary conductor 5, thereby causing the carrier 2
is accelerated. Next, the carrier 2 is connected to the primary coil M
, and when the carrier 2 is no longer detected by the sensor I], the control circuit 8 stops supplying the power supply command to the drive circuit D1, and the drive circuit D1 then outputs the three-phase signal to the primary coil M. Stop the supply of alternating current. From then on, the carrier 2 runs by inertia. In this way, the carrier 2 is connected to each primary coil M,,My,
Each time the primary coil M1
, M 2 , . . . , three-phase alternating current is sequentially supplied to the carrier 2, and as a result, the carrier 2 runs continuously while alternating between acceleration and coasting. In addition, when stopping the carrier 2, the primary coils M , , M 2+
... is excited in reverse phase to give thrust in the backward direction to the secondary conductor 5. Then, while the carrier 2 is running at a low speed, the carrier 2 is positioned and stopped at a predetermined position by magnetic means such as an electromagnet or mechanical means such as a stopper.

"Problems to be Solved by the Invention" By the way, in the above-mentioned conventional linear motor conveyance device, the control device 7 includes primary coils M I, M t + . . . provided on the conveyance path. Since the same number of drive circuits D , , D , . + D t +... increases, and the power supply line A connecting each primary coil M+ + M t +... and drive circuit D,, D,,...
,,A2. As the number of wires increases, their length also increases, resulting in a disadvantage that wiring work becomes extremely complicated. Furthermore, each sensor P provided on the conveyance path
,,P,,... and the signal line B connecting the control circuit 8
,,B,,..., and the control circuit 8 and each drive circuit D,,D! Signal line C connecting +...
・ also had the drawback of being large in number and length.

This invention was made in view of the above-mentioned circumstances, so that regardless of the number of primary coils, power can be supplied to a plurality of primary coils by a single power supply means (drive circuit). It is an object of the present invention to provide a rear motor type conveyance device that can reduce the number of wires and signal lines and simplify the device itself and wiring work.

``Means for Solving the Problems, 1 This invention provides a carrier that is movable along a conveyance path and on which objects to be conveyed are loaded, and a plurality of primary coils disposed along the conveyance path. and a secondary conductor provided in the carrier so as to face the primary coil, and controls power supply to each of the plurality of primary coils to sequentially apply thrust to the secondary conductor. In the linear motor type conveyance device for moving the carrier, a detection means for detecting the carrier is provided near each of the plurality of primary coils, and a switch is turned on while the carrier is being detected by the detection means. and connecting the output ends of each of the switching means to each of the primary coils,
The present invention is characterized in that the input ends of each of the switching means are commonly connected and connected to a single power supply means.

"Operation" Each time the carrier reaches above the primary coil, it is detected by the detection means provided near each primary coil, and the power output from the single power supply means is applied to each primary coil. It is supplied to each primary coil via a switching means provided near the coil. Therefore, regardless of the number of primary coils, power can be supplied to each primary coil by a single power supply means, which reduces the number of power supply lines and signal lines, and eliminates the need for the equipment itself and wiring. Construction work will be simplified.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In this figure, parts corresponding to those in FIG. 2 are given the same reference numerals, and their explanations will be omitted.

In this figure, Sl-5n (n is an integer) is the sensor, K
1 to Kn are detection circuits that detect carrier 2 based on the output of each sensor S1 to So, and R3 to Rn are solid state relays (SSR) that turn on/off in accordance with the output signals of 1 to Kn for each detection circuit. These are provided near the primary coils M1 to Mn, respectively.

The three-phase output ends of each solid-state relay R, -Rn are connected to the primary coils M1 to Mn, respectively, and the three-phase input ends of each solid-state relay R1 to Rn are connected to the primary coils M1 to Mn. It is commonly connected to a common power supply line A for three phases laid down. Further, the control input terminals of the solid state relays R3 to Rn are supplied with negative output signals to the respective detection circuits, so that when the carrier 2 reaches above the primary coils Ml-Mn, , when this is detected by the sensors S1 to Sn and the detection circuit 1 to 1, the solid state relays R1 to Rn are turned on in response to the output of the detection circuit 1 to 1, and the primary coil of the carrier 2 is turned on. Passing above M, ~Mn,
When the carrier 2 is no longer detected by the sensors S, -Sn and the detection circuits 1 to Kn, the solid state relays R1 to Rn are turned off. Each of the above components is a gantry UI.

U2. ...Each is provided above.

- On the other hand, in the figure, 7a is a control device, and the control device 7a
is the common power supply line A for each solid state relay R3 to Rn.
It consists of a drive circuit connected via a drive circuit, and a control circuit 8a that controls the operation of the drive circuit.

The drive circuit has a voltage adjustment function, and when a power supply command is supplied from the control circuit 8a, it adjusts the three-phase AC supplied from the external commercial power source to a preset voltage, and this voltage adjustment The three-phase alternating current is supplied to each solid state relay R, -n through a common power line A.

In such a configuration, when the carrier 2 reaches, for example, above the primary coil M1, it is detected by the sensor S1 and the detection circuit 1 provided near the primary coil M1, and the solid state relay R1 is turned on. becomes. As a result, the common power supply line A from the driver circuit
A three-phase AC power source guided by is supplied to the primary coil M via the solid state relay R1. Further, when the carrier 2 passes above the primary coil M, the sensor Sl no longer detects the carrier 2, and the solid state relay R1 is turned off. Similarly, when the carrier 2 reaches the upper part of the primary coils M and ~Mn, it is detected by the sensors S, ~sn and the detection circuit ~Kn, and the solid state relays R7~Rn are activated. Turns on.

According to the embodiment described above, the sensors S1 to Sn provided in the vicinity of the primary coils M1 to Mn, and the detection circuit,
-Kn and solid state relays R1 to Rn separately supply/cut off power to each primary coil Ml''-Mn, and from the control device 7a to each solid state relay R3 to Rn, power is supplied/cut off separately. i Power line A
Since three-phase alternating current is supplied by a single drive circuit, power can be supplied to each primary coil M, -Mn regardless of the number of primary coils M, -Mn. This reduces the number of power supply lines and signal lines, simplifies the device, and simplifies wiring work. In addition, sensors S1 to Sn for detecting carrier 2
Since the solid-state relays R3 to Rn are configured to be turned on and off directly by the output of -Kn, the detection circuit is configured to directly turn on/off the solid state relays R3 to Rn, so there is a delay in operation compared to the conventional configuration in which the detection signal is once taken into the control circuit. time can be shortened.

"Effects of the Invention" As explained above, according to the present invention, a detection means for detecting a carrier is provided in the vicinity of each of a plurality of primary coils disposed along a conveyance path, and a a switching means that is turned on while the carrier is being detected; the output end of each of the switching means is connected to each of the primary coils, and the input ends of the switching means are commonly connected to form a single Since it is connected to a power supply means, when the conveyance distance becomes longer and the number of primary coils increases, power can be supplied to multiple primary coils by a single power supply means. The number of wires can be reduced, and the device itself and wiring work can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of a conventional linear motor type conveyance device. 2...Carrier, A...Common power line, D...Drive circuit (power supply means), M1
~Mn...Primary coil, SI~Sn...
・Sensor, K1-...Detection circuit (detection means), R1~Ro...Solid stay. relay (switching means).

Claims (1)

[Claims] a carrier movable along a conveyance path and loaded with objects to be conveyed; a plurality of primary coils disposed along the conveyance path; and a plurality of primary coils disposed on the carrier to face the primary coils. and a linear motor type conveyance device that controls power supply to each of the plurality of primary coils to sequentially apply a thrust to the secondary conductor to cause the carrier to travel, wherein the plurality of detection means for detecting the carrier near each of the primary coils;
switching means that is turned on during a period when the carrier is detected by the detection means, output ends of each of the switching means are connected to each of the primary coils, and input ends of each of the switching means are commonly connected. A linear motor type conveyance device characterized by being connected to a single power supply means.