JPH0785603B2 - Conveyor device using linear motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a transfer device that transfers a transfer table on which a transferred object is placed by a linear motor while floating the transfer table with pressurized air.

(B) Conventional technology As a conventional example of this type of transfer device, a flat transfer table is fixed to the stator side of a linear motor, and the corresponding bottom surface of the transfer path on the mover side has a flat plate shape. Body transport devices have been proposed. In this transfer device, a plurality of pores are provided on the transfer table, and pressurized air is blown from below to the bottom surface of the transfer table placed on the transfer table to transfer the transfer table. It was able to be transported while floating from the road.

However, in the above method, since the mover and the stator that form the linear motor are arranged below the conveying path, the height of the entire conveying device becomes high, and there is a drawback that the installation place is restricted. . Further, such a type of transfer device has a problem that a large amount of pressurized air is required to float the transfer table.

(C) Purpose The present invention has been made in view of the above circumstances, and is small in size and efficient with a linear motor, and moreover, the efficiency of using pressurized air for floating the carrier is also improved, so that the required amount is also reduced. It is an object of the present invention to provide a transport device that can be used.

(D) Configuration A transfer device using a linear motor according to the present invention includes a transfer pipe having a closed pipe structure, and a stator of a linear motor disposed on both outer sides of the transfer pipe so as to face each other. A carrier table disposed between the stator and the carrier so as to straddle the carrier conduit, and the carrier conduit is provided on the upper surface and both side surfaces to inject pressurized air. It has a large number of pores and a magnetic body arranged on both side surfaces facing the stator, and the transfer table has a transfer table on which an object to be transferred is placed, and stators on both side surfaces. And a conductive body provided to face the magnetic body.

(E) Example FIG. 1 is a sectional view showing an example of a carrying device according to the present invention,
FIG. 2 is a plan view of the above embodiment.

In the figure, reference numeral 1 denotes a stator which constitutes a primary side of a linear motor, and is fixed to the inner surface of a frame (not shown) so as to face each other at a predetermined interval in the transport direction.

A carrier pipe 2 is arranged in the center of the inside of the stator 1, and the carrier pipe 2 has a square cross section as a whole and is fixed to a frame (not shown). The transfer conduit 2 is composed of a non-magnetic material, a non-conductive material, such as a stainless steel plate or a resin plate, which has a cross section 2a symmetrically, and the upper side 2b and the both side 2c each have a small diameter. The hole 2d is open. However, in the present embodiment, the pores 2d are arranged geometrically symmetrically, but it is not always necessary to arrange them geometrically symmetrically.

Then, the magnetic bodies 3 are arranged on both inner side walls of the transfer conduit 2 so as to correspond to the stator 1. The magnetic body is composed of, for example, an iron plate. As shown in the drawing, there is a pressurized air suction port having an appropriate diameter at the lower part of the transfer pipeline 2, and pressurized air is introduced from this pressurized air suction port.

Reference numeral 4 denotes a carrier, and the carrier 4 has, for example, a U-shaped cross-section, and is arranged so as to straddle the carrier pipeline 2 in an opening at the bottom. At least both side surfaces of the carrier table 4 are present between the stator 1 of the linear motor and the magnetic body 3 (such as an iron plate), and a conductive body such as an aluminum or copper plate is used as a reaction plate of the linear motor so as to generate thrust. Composed of. 5
Is an object to be transferred placed on the transfer table 4.

The pressurized air is sent from the lower part of the transfer conduit 2 toward the inside of the transfer conduit 2 and is jetted to the upper side and both sides of the transfer conduit 2 through the pores 2d.

Next, the operation of the carrier device according to the present invention configured as described above will be described.

Pressurized air is sent from the lower part of the transfer pipeline 2 to the inside of the transfer pipeline 2 and jetted from the pores 2d to the upper side and both sides of the transfer pipeline 2.

The jetted pressurized air is the lower surface 4a of the horizontal plane of the carrier 4.
Since the inner surfaces 4b on both sides are pressed, the carrier table 4 floats.

Here, the stator 2 of the linear motor is sequentially excited to obtain the thrust of the carrier table 4 as is known. Therefore, the carriage 4 is carried in the direction shown by the arrow in FIG.

In this case, the magnetic bodies 3 arranged corresponding to the stator 1 on both outer sides of the transport conduit 2 absorb the magnetic flux generated from the stator 1, so that the magnetic flux easily passes through the conductive body. As a result, the eddy current generated in the dielectric becomes large and the carrier table 4
The thrust given to is increased. Moreover, since the magnetic body 3 is a separate body from the carrier 4, the weight of the carrier 4 is also reduced, and the amount of pressurized air for floating can be reduced.

In another embodiment, the magnetic body 3 is omitted and the carrier pipe 2 is made of an iron plate or a non-magnetic body, or the stator 1 is used.
It is also possible to dispose on only one side.

FIG. 3 is a diagram showing another embodiment. In FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals.

The present embodiment is different from the previous embodiment in that the stator 1 of the linear motor is fixed to both inner sidewalls of the conveying conduit 2 at predetermined intervals in the conveying direction, and the magnetic body 3 is not shown in the frame. That is, they are arranged on the inner side wall of the above so as to correspond to the stator 1. In this case, the carrier line 2 needs to be made of a non-magnetic material, and the structure other than the above is the same as that of the previous embodiment.

(F) Effects The present invention has the following effects as described in the above embodiment.

Since the magnetic body is arranged so as to face the stator disposed on either the outer side or both inner side walls of the transfer conduit, it is effective as a path for the magnetic flux generated from the stator Since the magnetic flux density can be increased and the thrust generated by the linear motor can be increased, the device can be downsized.

The stator is installed on either the outer side or both the inner side walls of the transfer pipeline, and the linear motor is constructed by using the transfer stand as a reaction plate. This is a structure in which the carrier table is floated by pressing with compressed air. Therefore, the height of the entire transport device can be reduced. Further, since the pressurized air can be effectively used, the required air amount can be reduced.

Since it does not generate dust, etc., it can be used in a clean room. Therefore, the present invention has the effect that a linear motor can be used to achieve a small size and high efficiency, and in particular, the height dimension thereof can be reduced, and the required air amount for floating can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a carrying device according to the present invention,
FIG. 2 is a plan view of the above embodiment, and FIG. 3 is a sectional view showing another embodiment. 1 ... Stator, 2 ... Conveying pipeline, 2d ... Pores, 3 ... Magnetic material, 4 ... Conveying stand, 5 ... Conveyed object.

Claims (1)

[Claims] 1. A transfer pipeline having a closed pipe structure, a stator of a linear motor disposed on both outer sides of the transfer pipeline so as to face each other, and a transfer pipeline straddling the transfer pipeline. And a carrier table disposed between the stator and the stator, and the carrier pipeline is provided on the upper surface and both side surfaces with a large number of pores for injecting pressurized air and on both side surfaces with the stator. The transfer table has a magnetic material arranged to face each other, and the transfer table has an upper surface on which a transferred object is placed and a conductive material provided on both side surfaces so as to face the stator and the magnetic material. A conveyance device using a linear motor, which has a body.