JPS62126027A - Transport table turning device in transport line - Google Patents

Abstract

PURPOSE:To make a turning device in thinner form by incorporating such a construction that a transport table is moved to a turning floor and the two centers of revolution are put identical and joined, which is disengaged after 90 deg. revolution by a linear induction motor and stopping, and that the transport table is transported by a transport motor. CONSTITUTION:To turn each transport table H to the left, it is moved onto a turning floor F and stopped, and the center 15 is raised by a center mechanism 13 until engagement with a center hole 14 in the undersurface of the transport table H, which is now borne rotatably round the center 15. If an advancing magnetic field in the direction of arrow is generated in LIM stators a-d on said turning floor F, the transport table H receives a moment of rotation round the center 15 to rotate in the direction of arrow, and at 90 deg. revolution, energization of the stators a-d is turned off to stop the transport table H, and the center 15 is sunk to cause disengagement, wherein an advancing magnetic field in the direction of arrow is generated in the stators c, d while the stators a, b remain de-energized, and now the transport table with its head swung to the transport path C by a thin type turning device is forwarded to the transport path C as shown by the arrow.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that rotates or translates a conveyance table in a predetermined conveyance path direction at a part of a corner, a branch part, etc. of a conveyance line. , and particularly relates to devices using linear induction motors.

[Prior Art] Conventionally, a conveying device using a single-sided linear induction motor (hereinafter abbreviated as LIM) as a drive source is known as a means for conveying objects on a product assembly conveyance line or the like.

An example of this conveying device is shown in FIG. 1O. In this device, the upper stage is an assembly line 2 in which workpieces are placed on a pallet (transport table) L and transported, and the lower stage is a return line 3 for returning empty pallets l to the starting point of the assembly line 2. It becomes. Then, lever lids 4.5 are installed at the start and end points of the assembly line 2, respectively, and lift the empty pallets l sent on the return line 3 to the start point of the assembly line 2.
The pallet 1 at the end of the assembly line 2 is lowered to the starting point of the return line 3, thereby causing the pallet 1 to be ringed.

By the way, if, for example, another transport line 6.7 intersects in the middle of such an assembly line 2, the pallet l is sent out toward the desired transport path direction at the intersection (branch). A turning device 8 is provided.

Conventionally, a turntable with a pure mechanical structure that combines a rotary motor and gears, etc., has been used as a turning device in such places, and the turntable is rotated with a conveyor platform placed on the turntable. By doing so, I was trying to make a turn.

[Problems to be Solved by the Invention] The turntable-type rotation device described above is a combination of a rotary motor and gears, so it has a complicated structure and tends to be large in size, especially in the height direction. It was not suitable for being incorporated into a LIM type conveyance line, which has one advantage of reducing the height dimension of the line itself.

The object of the present invention is to obtain a turning device which is simple in construction and can be made especially thin.

"Means for Solving the Problems" The turning device of the present invention is a device that uses a linear induction motor as a driving means to turn or move a conveyance table in parallel on a turning bed. The center of rotation of the rotating floor surface and the center of rotation of the conveyor table can be brought into engagement by aligning the center of rotation of the rotating floor surface with the center of rotation of the conveyor table, and can also be released from the engaged state. On the other hand, there is a center mechanism that rotatably supports the rotation center using the rotation center as a fulcrum, and a rotation drive linear induction motor that applies a rotational moment about the rotation center to the conveyor table when the conveyor table is engaged with the center mechanism. , a transfer linear induction motor that moves the conveyance table in a predetermined direction when the conveyance table is disengaged from the center mechanism, and the primary side and the secondary side of both the linear induction motors are , are arranged on one and the other of the rotating bed and the conveyance table, respectively.

[Operations] The operation of the turning device having the above configuration will be explained by taking as an example the case where it is used at an intersection where conveyance paths A, B, C, and D intersect in a cross-shaped manner. However, transport paths A, B, and C.

D is oriented east, west, north, south, respectively.

First, when the conveyance table that has been transported on the conveyance path A and has reached the intersection is to be moved straight to the conveyance path B, only the f multi-feed linear induction motor is operated to move the conveyance table forward as it is.

Also, if you want to turn left from conveyance path A toward conveyance path C, and especially if you want to turn the conveyance platform 90 degrees to the left and transfer, first bring the conveyance platform onto the turning floor and activate the center mechanism. , the rotation center of the rotation bed and the rotation center of the conveyance table are brought into alignment, and the rain sound is brought into an engaged state, and in this state, the linear induction motor for rotation drive is operated. Then, the conveyance table rotates by receiving a rotational moment about the rotation center as a fulcrum. Then, when the conveyance table has been turned leftward by 90', the turning drive is stopped and the engagement operation by the center mechanism is released. At this time, the front part of the conveyance table faces iIU of the conveyance path C.

Then, by activating the multi-feed linear induction motor, the conveyance platform is transferred toward the conveyance path C.

Further, when turning right from the conveyance path A to the conveyance path, the turning direction is reversed and the operation is performed in the same manner as described above to perform f multi-feeding.

Next, a case will be described in which the conveyance table is moved in parallel from the conveyance path A to the conveyance path C while turning left and being conveyed. In this case, the transport table that has been brought onto the rotating bed is moved directly to the transport path C by operating the transport linear induction motor.

It is also possible to transfer parts of branches and corners other than crossroads using the above application.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a plan view showing the configuration of the embodiment, and in this example, transport paths A, B, and C1D intersect in the shape of a cross at an intersection. In the figure, F indicates the area at the center of the intersection, which is the floor of the area where the conveyance platform turns, and ■] indicates the conveyance platform.

The transport platform I] is moved by the driving force of the LIM in the transport paths A, BSC, and D, and on the floor of each transport path A, B, C, and D, there is a LIM responsible for generating a traveling magnetic field at a predetermined position. A stator (primary side) 10 is provided respectively, and a secondary side conductor (not shown) is provided on the bottom surface of the transport platform ().The stator IO is connected to each transport path A%B, C. , D are arranged in two rows for each transport path ASB, C, D.
Rollers 11 for supporting and guiding the conveyance table H are arranged at appropriate locations on the floor surface of the conveyor table H.

Further, a turning center O is determined on the turning bed F,
Four LIM stators a surround this rotation center 0,
b, c, and d are arranged. Among these, stator a,
b is arranged on the same straight line as the LIM stators 10 of the transport paths A and B, and the directions in which the traveling magnetic fields are generated are the same. Furthermore, stators c and d are the LIM stator 10 of the conveyance path C1D.
are arranged on the same straight line, and the direction of generation of the traveling magnetic field is the same.

In addition, the LIM stators a, bSc, and d are arranged in this way, and the transport platform H is rotated on the rotating floor F. On the rotating floor F, there is a Spherical roller 12 for guiding movement in all directions
is located.

Furthermore, there is a center mechanism at the rotation center 0 of the rotation floor F! 3 is provided. This center mechanism 13 aligns the rotation center of the conveyance table H with the rotation center O of the rotation floor F when the conveyance table H is on the rotation floor F, and brings the rotation center O into an engaged state. It is supported so as to be rotatable in the horizontal direction with respect to F. In this case, as shown in FIG.
It is a thin type consisting of a horizontal cylinder 17 which is raised appropriately via a cam mechanism 16.

Now, FIG. 2 shows a state in which the engagement is released.

Next, the operation of the turning device configured as above will be explained.

(1) First, transport platform H transported from transport path A is
Transfer path B i, with the same posture: 3.
Based on the diagram, Ll■ stator a on the rotating bed F,
Among stators b, c, and d, a traveling magnetic field is generated in the direction of the arrow in stators a and b, while the other stators c and d are not excited. On the rotating floor F in this state, the transport platform ■
(When this point is reached, the conveyance platform H receives a thrust in the direction of arrow (A) and is transferred to the conveyance path.

(11) Next, a case will be described based on FIGS. 4(a) and 4(b) in which the conveyance table H, which has been conveyed from the conveyance path A, is turned left and transferred to the conveyance path B.

As shown in FIG. 4(a), the transport platform H is brought to a stop on the rotating bed F, and the center mechanism 13 is activated to raise the center 15 shown in FIG. Platform H
the center hole 14 on the bottom surface of the holder. As a result, the conveyance platform (■) is rotatably supported around the center 15. In this state, the L M stator a on the rotating floor F
, bSc, d to generate a traveling magnetic field in the direction of the arrow.

Then, the conveyance table 11 receives a rotational moment about the center 15 and rotates in the direction of the arrow (b). As shown in Fig. 4(b), when the stator a is rotated by 90 degrees,
, b, c, and d are stopped, and the transport platform H is stopped. Next, the center 15 of the center mechanism 13 is lowered to release the engagement, and a traveling magnetic field in the direction of the arrow is generated in the stators c and d without excitation of the stators a and b. Then, the conveyance table is transferred to the conveyance path C as shown by the arrow (c) with the sprout part facing the gravity of the conveyance path C.

(iii) Also, the conveyance platform H conveyed from the conveyance path A
In this case, after the center mechanism 13 on the rotating bed F causes the centers of rotation of the transport platform H and the rotating bed F to coincide with each other, the above-mentioned ( i
The conveyance platform H is transferred to the conveyance path in the opposite direction to that in case i) while avoiding the generation of a traveling magnetic field.

(1v) Next, the transport platform I is transported on the transport path A]
Describing the case of transferring the material to the conveying path C by moving parallel f to the conveying path C based on FIG. 5, when the conveying platform H comes onto the rotating bed F, the stator C and the drake generate a traveling magnetic field in the direction of the arrow. . Then, the conveyance table (■) is transported along the conveyance path cr,: as shown by the arrow (d) while maintaining its posture. In this way, the LIM stator t1. on the rotating bed F. b, c, d control,
And by appropriately controlling the center mechanism 13,
It is possible to realize various transport forms not limited to those described above.

In the turning device of this embodiment, each LIM consisting of each stator a% b, cs d on the turning floor F and the secondary conductor of the carrier H, that is, four sets of LIMs, are It is designed to perform both functions for business and transportation. Next, a simple example will be given in which LtMs for turning and transport are provided separately.

FIG. 6 is a plan view showing a second embodiment of the present invention, in which transport paths A, C, and D intersect in a T-junction.

In this case as well, the ground primary method is used as in the first embodiment.
A LIM stator lO and rollers If are provided on the floor surfaces of the transport paths A, C, and D. In this case, the stators 10 are provided in only one row offset from the center line.

Furthermore, the rotating bed F is provided with 2111 LIM stators a and c. For the stator on the unrotated F, one stator a is on the same straight line as the stator IO of the conveyance path Δ, C, D, and the advancing magnetic field direction is the same, and the other stator C or the stator IO of the conveyance path C is on the same straight line. It is on the same straight line as the child IO, and the direction of the traveling magnetic field is the same. In this case, the stator C is mainly configured to function for rotation, and the other stator a is configured to function for transfer. The structures of the other spherical rollers 12 and center mechanism 13 are the same as those of the previous embodiment.

In this turning device, when the transfer is to be carried out by turning left from the conveying path 8 to the conveying path C, the conveying table H is first brought onto the turning bed F, and the center mechanism 13 and stators a and C are moved as in the above embodiment. It is controlled in substantially the same manner and turned and guided to the conveyance path C.

Next, a third embodiment will be described as a modification thereof.

FIG. 7 shows a third embodiment of the present invention, in which the transport paths A%C%D intersect with each other at an angle of 120°. And the LIM stator a on the rotating floor F,
Two stators aSC are provided, and these two stators aSC are each arranged on the same straight line as the stator 10 of the conveyance path CSD, and the directions in which the traveling magnetic fields are generated are made to coincide with each other.

In the above, an example of the terrestrial primary system has been shown, but next, an example of the terrestrial secondary system will be explained.

FIG. 8 shows a fourth embodiment of the present invention, in which four LIM stators are arranged on a transport platform H.

These stators 20, 21, 22, and 23 are arranged so as to surround the rotation center 01 of the conveyor table. Stator 20.2
1 are arranged on the left and right sides of the conveyor table H, and are provided so as to generate a traveling magnetic field toward the rear of the conveyor table H, and the stator 22.2
3 is disposed behind the surface of the carrier H, and is provided so as to be able to generate a traveling magnetic field in the left-right direction of the carrier H.

On the other hand, the secondary conductors 24, 24, 25 are continuously attached to the conveyance path H and the rotating bed F, and the secondary conductors 24, 24, 25 of the rotating bed F
5 is stretched in a circular shape on the rotating floor F so that the conveyor platform [1] can be rotated. Note that the roller 11. The center mechanism 13 and spherical roller 12 are the same as in the previous embodiment. In the turning device with such a configuration, when the conveyance platform H is brought onto the rotation floor F, the conveyance platform 1 appropriately controls the LrM stator 20, 21, 22, 23 provided therein. You can freely turn, move parallel, move backwards, etc.

Next, a more simplified version of this example will be explained with reference to FIG. 24
．． 25 are arranged. In this example, stator 3
0 is offset from the center of rotation, when the stator 30 is energized when centered by the centering mechanism 13, a rotational moment is applied to the conveyance table 11, making it possible to rotate it as in the example described above.

As described above, in the present invention, the stator may be disposed on the ground side or on the conveyance platform side. Further, in the above example, the main body side of the center mechanism 13 is arranged on the ground side, but it is also possible to arrange the center hole on the ground side and the main body on the transport platform side.

Further, in the above embodiments, a case has been described in which the turning LIM and the transporting LIM are almost used both, but they can also be provided completely separately.

[Effects of the Invention] As described above, in the present invention, the rotation mechanism is configured by a linear induction motor, so that the mechanical configuration is extremely simplified and a reduction in thickness is achieved.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the configuration of the first embodiment of the present invention, and FIG.
The figure is a side view of the center mechanism in the same embodiment, FIGS. 3 to 5 are plan views shown to explain the operation of the turning device in the same embodiment, and FIGS. 2. 3rd
, a plan view showing the configurations of the fourth, fifth, and sixth embodiments, and the tenth embodiment.
The figure is a perspective view shown for explaining a conventional example. A, B, C, D... Conveyance path, H... Conveyance table, F... Turning floor, 13... Center mechanism, a,
b, c, d, 20. 2+, 22.23...Stator of linear induction motor (primary side), 24.25...Secondary side conductor.

Claims (1)

[Claims] The conveyor table moving on the conveyor line is rotated on the rotating floor,
Alternatively, it is a conveyor table turning device for parallel movement, which is provided between a turning floor and a conveyor table, and can be brought into an engaged state by aligning the rotation center of the turning floor surface with the rotation center of the conveyor table, and the engagement state a center mechanism that can release the state and rotatably supports the conveyance table with respect to the turning floor using the turning center as a fulcrum when in the engaged state; and a center mechanism that allows the conveyance table to be conveyed when the conveyance table is in the engaged state. A rotation drive linear induction motor that applies a rotational moment around the rotation center to the table, and a transfer linear induction motor that moves the conveyance table in a predetermined direction when the conveyance table is disengaged from the center mechanism. A conveyance platform rotation device for a conveyance line, characterized in that the primary side and the secondary side of both the linear induction motors are arranged on one and the other of the rotation floor and the conveyance platform, respectively.