JPH05191998A - Motor controller - Google Patents

Abstract

PURPOSE:To constitute the entire motor controller inexpensively and to simplify the structure thereof by a constitution comprising a plurality of motors, one inverter, and a switching means. CONSTITUTION:A board loading station is provided with a motor control circuit 100 and an inverter 92 is disposed at the prestage of motors 90, 32, 91. Switches 93, 94, 95 are interposed, respectively, between the inverter 92 and the motors 90, 32, 91 in order to switch the connection between the inverter 92 and the motors 90, 32, 91. According to the constitution, speed control of the motors 90, 32, 91 can be carried out by means of a single inverter 92.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device, and more particularly to a motor control device for controlling the rotation speed of a motor.

[0002]

2. Description of the Related Art A plate material processing line for bending a plate material, for example, generally has a plate material loading station for loading a plurality of plate materials. In this plate material loading station, for example, a movable material carriage for mounting the material plate material, a movable product carriage for mounting the processed plate material, and a separating device for separating the material plate material on the material carrier material are provided. Is provided.

In such a plate material loading station, generally, each drive unit of the carriage is connected to a dedicated inverter, and the speed control is performed by each inverter. Therefore, the entire apparatus becomes expensive and the structure becomes complicated. The purpose of the invention is to simplify the structure.

[0004]

A motor control device according to the present invention comprises a plurality of motors, one inverter, and switching means. The inverter controls the rotation speed of each motor. The switching means switches and connects the inverter and each motor.

[0005]

In the motor control device according to the present invention, the switching means switches and connects the inverter and each motor. As a result, the rotation speed of each motor is controlled by one inverter. Thereby, the structure can be simplified and an inexpensive device can be realized.

[0006]

1 shows a plate material loading station in a plate material processing line to which an embodiment of the present invention is applied. This plate material loading station includes a material carriage 1 for accommodating a material plate material W ₁ and a processed plate material W ₂ arranged below the material carrier 1.
And a product cart 2 for accommodating the product. On the material trolley 1 and the product trolley 2, a pallet P on which each plate material is loaded is placed. The carriages 1 and 2 are movable on rails 3 and 4 extending in the front-rear direction (direction perpendicular to the paper surface of FIG. 1), respectively. Further, a rail 5 that movably supports the rail 3 is disposed on the side of the rail 3. A drive portion 5a for driving the rail 3 in the front-rear direction is provided on the side portion of the rail 3. Further, the lower portion of the rail 3 extends so as to project inward, and this protruding portion 3a
A pin 29 is inserted through the pin so as to be vertically movable. Pin 29
The upper portion is provided with a flange portion 29a, which prevents the pin 29 from falling off. Also, pin 2
The upper end of 9 can contact the lower surface of the material carrier 1 and the lower end can contact the upper surface of the product carrier 2. Below the product cart 2, a lifter 6 for moving the product cart 2 upward is provided.

A rail 7 is horizontally installed above the material cart 1 and the product cart 2. On the rail 7,
Loader 8 for loading the plate material processing machine (arranged in Fig. 1 right) (not shown) material work sheet W ₁ in materials bogie 1 is provided to be run. The loader 8 has a frame 8a that can be raised and lowered. The frame 8a is provided with a plurality of suction pads 9 for sucking the material plate material W ₁ .

Below the rail 7, a chain 60 is left and right.
Are arranged in the direction. The chain 60 has two ends
Wrapped around the sprockets 61 and 62 placed
It is possible to drive. On part of the chain 60
Has an unloader gripper 63 attached thereto. A
The loader gripper 63 is a processed plate material W that has been processed.
₂The product from the plate processing machine and carry it onto the product cart 2.
It is for.

A moving roller device 70 is provided above and to the side of the material truck 1. The moving roller device 70 is composed of a chain 70 that can run around a plurality of sprockets and a plurality of roller groups 72 that are rotatably provided on the chain 70. The roller group 72 extends above the material carriage 1 to form a table surface 70a on which the processed plate material W ₂ can be placed, above the material carriage 1. Further, by driving the chain 70, an opening is formed in a part of the table surface 70a above the material carriage 1, and the processed plate material W ₂ on the table surface 70a is placed on the product carriage 2 below from this opening. It is supposed to be dropped.

Above the material carriage 1, a plate material separating device 10 as shown in FIGS. 2 and 3 is provided. This plate material separating apparatus 10 includes two pairs of first and second contact portions 11 and 12 that are arranged to face each other with the plate material W ₁ interposed therebetween, and each contact portion 1.
It is mainly composed of a drive mechanism 30 for moving 1 and 12. The drive mechanism 30 includes the first and second contact portions 1
They are arranged on both sides of 1 and 12, respectively.

Each drive mechanism 30 has a pair of chains 31 arranged above the material carriage 1 and a main motor 32 for driving the chains 31. Each chain 31
The sprockets 33 and 34, which are provided in parallel to each other and have the same diameter, are rotatably provided on both sides of the material cart 1, respectively. A sprocket 35 is attached to the motor 32, and the sprocket 33, 3
A chain 36 is wound between the five.

An upper portion of the stay 13 extending downward is fixed to a part of the upper side of the chain 31 arranged in parallel between the sprockets 33 and 34. The stay 13 also extends between the chains 31, as shown in FIG. A frame 14 extending in the extending direction of the stay 13 is fixed to the lower portion of the stay 13. Through holes 15 are formed at two positions in the frame 14.
A rod 16 is fitted in each through hole 15 so as to be retractable. The first contact portion 11 is fixed to the tip of each rod 16. A coil spring 17 is contracted around each rod 16 between the frame 14 and the first contact portion 11.

A knurl bar 18 having a knurled surface is attached to the tip of the first contact portion 11. The knurled bar 18 is a member whose tip end surface is formed in an arc shape and which extends in the up-down direction (direction perpendicular to the plane of FIG. 3). A wire brush 19 made of, for example, stainless steel is implanted on the side of the knurl bar 18 at the tip of the first contact portion 11.

A through hole 20 is formed in the frame 14 between the first contact portions 11. A detection rod 21 is fitted in the through hole 20 so as to be retractable. An abutting plate 2 that can abut the end surface of the plate W at the tip of the detection rod 21.
2 is provided, and a support portion 23 having a diameter larger than that of the detection rod 21 is provided on the rear surface side of the contact plate 22. A coil spring 24 is compressed around the detection rod 21 between the support portion 23 and the frame 14. Further, a plate 25 extending to the side opposite to the protruding side of the detection rod 21 is fixed to the lower portion of the frame 14. A first proximity switch 26 that detects the end of the detection rod 21 is provided on the plate 25. With this configuration, the contact plate 2
The proximity switch 26 detects that the plate 2 is in contact with the end surface of the plate material.

On the other hand, a stay 27 extending downward is fixed to the lower side of the chain 31 between the sprockets 33 and 34. Two stays 27 are provided on each chain 31. Below the stay 27,
The base 52 is fixed. Rods 53 extending in the arrangement direction of the chains 31 are provided on the ends of the bases 52 on the chains 31 side. Each rod 53
Is supported by support portions 54 arranged on the base 52 at both ends thereof. On the other hand, the slide base 50 is arranged above the base 52. The slide base 50 is a member extending between the chains 31. Each chain 31 at the bottom of the slide base 50
Slide bearing units 51 are provided on the respective sides. Each rod 53 is inserted through the slide bearing unit 51, and the slide bearing unit 51 is slidable on the rod 53. A frame 28 similar to the frame 14 is fixed to the upper part of the slide base 50 and extends in the direction perpendicular to the plane of FIG. With this configuration, the entire frame 28 is movable in the chain 31 arranging direction via the slide base 50.

The frame 28 is provided with two retractable second contact portions 12 having the same structure as the first contact portion 11 at two locations. That is, each second contact portion 12 has a rod 40 that fits in the frame 28 in a retractable manner.
A coil spring 41 is contracted around the rod 40. A knurl bar 42 and a wire brush 43 similar to those on the first contact portion 11 side are provided at the tip of each second contact portion 12. Further, between the second contact portions 12, the frame 28 is provided with a detection rod 44 having the same configuration as the detection rod 21. That is, the detection rod 4
4 has a contact plate 45 that can contact the end surface of the plate material W, and a coil spring 46 that is contracted around the detection rod 44. A second proximity switch 59 that detects the end of the detection rod 44 is provided on the slide base 50. The detection rod 44 and each second contact portion 12
Are the corresponding detection rods 21 on the frame 14 side.
And, it is arranged to face each of the first contact portions 11.

A ball screw 55 is provided on the base 52 and extends in the direction in which the rod 53 is provided. One end of the ball screw 55 is connected to a servo motor (submotor) 56 arranged on the base 52, and the other end is connected to the base 5.
It is rotatably supported by the support part 57 on the upper part 2. On the other hand, a ball nut 58 is fixed to the lower part of the slide base 50. The ball nut 58 is screwed onto the ball screw 55.

A motor 68 (FIG. 1) is attached to the frame 28, and the rotation shaft of the motor 68 is connected to the rod 40. By driving the motor 68, the second contact portion 12 can be rotated around the rod 40, whereby the processed plate material W ₂ carried out by the unloader gripper 63 and the upper portion of the second contact portion 12 are moved. Interference can be avoided.

The plate material loading station has a motor control circuit 100 as shown in FIG. In FIG. 4, M11 is a drive motor 9 for traveling of the material truck 1.
0, M22 indicates the motor 32, M12 indicates the traveling drive motor 91 for the product cart 2, and M23 indicates the motor 68. An inverter 92 is arranged in front of each of the motors 90, 32 and 91. The inverter 92 is for controlling the rotational speeds of the motors 90, 32 and 91. Inverter 92 and each motor 9
Between 0, 32 and 91, the changeover switch 9
3, 94 and 95 are provided. Each changeover switch 9
3, 94 and 95 are composed of, for example, a magnetic contactor with a thermal relay. The inverter 92 and the motors 90, 32 and 91 are switched and connected by these changeover switches 93, 94 and 95.

In this way, each motor 90, 32 and 91
Since the speed control is performed by the single inverter 92, the entire device is inexpensively constructed and the structure is simplified. Also,
An inverter 96 is arranged on the front side of the motor 68. The inverter 96 is also for controlling the rotation speed of the motor 68. Next, the operation of the above embodiment will be described.

When the material plate W1 is carried in, first, the changeover switch 94 is turned on, the main motor 32 is driven and controlled by the inverter 92, and the sub motor 56 is driven. As a result, the first and second contact portions 11 and 12 are set to the initial position which is the most separated position.
From this state, the material plates W1 stacked on the pallet P
An operator carries the material onto the material cart 1 using a forklift or the like. When the material plate material is loaded, the changeover switch 94 is turned off and the changeover switch 93 is turned on. As a result, the drive motor 90 for traveling of the material truck 1 is drive-controlled by the inverter 92, and the traveling of the material truck 1 is controlled.

When the loading operation of the material plate W1 is completed, the loader 8 is driven to start traveling, and the loader 8 moves above the material truck 1. On the other hand, the drive control of the inverter 92 causes the main motor 32 to move through the changeover switch 94.
Further, the sub motors 56 are respectively driven in the opposite directions. By driving the main motor 32, the sprocket 3
5 and the chain 36, the sprockets 33 and 34
Rotates, and the chain 31 starts traveling in the direction of the arrow in FIG. As a result, the first contact portion 11 moves via the stay 13 fixed to the upper side of the chain 31, and the second contact portion 12 moves via the stay 27 and the base 52 fixed to the lower side of the chain 31. Moves to move the contact parts 11 and 1
Two approach each other. Further, the ball screw 55 is rotated by the driving of the sub motor 56, and the slide base 50, the frame 28, and the second contact portion 12 are inserted through the ball nut 58.
And the contact plate 45 moves. In this way, the first contact portion 11 and the second contact portion 12 contact the respective end surfaces of the corresponding material plate W1.

When the contact plate 22 contacts the end surface of the material plate W2, the detection rod 21 moves to the proximity switch 26 side and the proximity switch 26 is turned on. Also, the material plate material W
When the contact plate 45 contacts the one end face, the detection rod 44 moves to the proximity switch 59 side, and the proximity switch 59 is turned on. When the proximity switches 26 and 59 are turned on, the driving of the main motor 32 and the sub motor 56 is stopped. At this time, the knurl bar 18 and the wire brush 19 of the first contact portion 11 are pressed against one end surface of the material plate W1, and the knurl bar 42 and the wire brush 43 of the second contact portion 12 are pressed against the other end surface. Pressed.

From this state, the plate material separating operation is performed. That is, first, the lifter 6 is driven to raise the product cart 2. Then, the upper surface of the product cart 2 contacts the lower portion of the pin 29 and pushes up the pin 29. This allows pin 2
9 The upper part of the material truck 1 contacts the lower surface of the material truck 1 and pushes up the material truck 1. On the other hand, a loader 8 is moving above the material cart 1. Therefore, when the material truck 1 is lifted, the material truck 1
The material plate material W1 loaded on the top approaches the loader 8. Next, the frame 8a of the loader 8 is lowered, and the suction pad 9 sucks and holds the uppermost material plate W1 on the material carriage 1. From this state, the suction pad 9 is raised again.
At this time, since the first and second contact portions 11 and 12 are in pressure contact with both end surfaces of the loading plate material on the material cart 1, respectively,
As the suction pad 9 rises, a large separating force acts between the uppermost plate W1 and the plate W1 below it. This ensures that the uppermost plate W1 is separated.

After the plate material is separated, the loader 8 is moved to the punch press machine (located on the right side in FIG. 1), and the material plate material W1 held by the suction pad 9 is carried into the punch press machine. Next, when the processed plate material that has been processed by the punch press machine is carried out, the contact portions 11 and 12 are separated from the material carriage 1 by driving the motor 32, and the motor 6 is driven.
8 is controlled by an inverter 96 to drive the second contact portion 1
2. Rotate 2 around rod 40. As a result, the interference between the processed plate material and the contact portions 11 and 12 is avoided. Next, the drive unit 5a is driven to move the material cart 1 along with the rail 3 along the rail 5. As a result, the material carriage 1, the rail 3 and the pin 29 as a whole are retracted from above the product carriage 2. Next, the lifter 6 is driven to move the product carriage 2 upward so that the material carriage 1 is arranged at substantially the same height position. From this state, the unloader gripper 63 is moved to the punch press machine side, and the processed plate material that has been processed by the punch press machine is gripped by the unloader gripper 63.
Then, the unloader gripper 63 is moved above the product cart 2.

By the movement of the unloader gripper 63, the processed plate material gripped by the unloader gripper 63 is placed on the table surface 70a composed of the roller group 72 of the moving roller device 70. By driving the moving roller device 70 from this state, an opening is formed in a part of the table surface 70a, and the processed plate material arranged in the unloader gripper 63 is dropped onto the product cart 2 below from this opening. In this way, the processed plate material W2 is used as the product cart 2
Housed on top.

[Other Embodiments] In the above embodiment, the case where the present invention is applied to the plate material loading station has been shown, but the application of the present invention is not limited to this, and it has a plurality of drive parts (motors) The same can be applied to a drive system that controls the speed of each drive unit.

[0028]

According to the motor control device of the present invention,
Since each of the plurality of motors is switched and connected to one inverter to control each motor, the entire apparatus can be inexpensively constructed and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic front view of a plate material loading station according to an embodiment of the present invention.

FIG. 2 is a schematic front view of a plate material separating device of the plate material loading station.

FIG. 3 is a schematic plan view thereof.

FIG. 4 is a schematic configuration diagram of the embodiment.

[Explanation of symbols]

 32 Main Motor 90 Material Cart Drive Motor 91 Product Cart Drive Motor 92 Inverter 93, 94, 95 Changeover Switch 100 Motor Control Device

Claims (1)

[Claims] 1. A motor control device comprising: a plurality of motors; one inverter for controlling the number of revolutions of each motor; and switching means for switching and connecting the inverter and each motor.