JPH03118701A - Linear induction motor type conveyer - Google Patents

Abstract

PURPOSE:To facilitate satisfactory conveyance by a method wherein a conveying track has a part of left and right secondary conductors which are so provided as to face respective linear induction motors provided on both the sides of a truck and the left conductor and the right conductor alternately have a plurality of respective flat parts with which the track can change its direction. CONSTITUTION:For instance, if a track 1 is at a position P1, a linear induction motor 2b on the right side of the truck 1 is provided in parallel with the flat part 4D of an outside secondary conductor and a force F to the direction of an arrow is induced. On the other hand, if a truck 1 is at a position P2, a linear induction motor 2a on the left side of the truck 1 is provided in parallel with the flat part 3A of an secondary conductor 3A and a force F in the direction of an arrow is induced. Thus, in the curved track, the linear motor 2a (2b) on the one side of the truck 1 mainly exhibits a driving force to move the truck 1 and the driving force is replaced with a driving force induced by the other side secondary conductor 4 (3). With this constitution, the decline of a thrust can be avoided and satisfactory conveyance can be ensured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a conveyance device using a linear induction motor (LIM), and particularly to a conveyance device in which a conveyance vehicle runs on a conveyance track including an ascending and descending section and a curve. do.

[Prior Art] A linear induction motor, which has a configuration in which an induction motor is cut open and expanded, has a structure in which a primary coil, which is a power feeding side, and a secondary conductor, which is a power receiving side, face each other across a gap. A combination of a conductor and a magnetic material is often used on the secondary side. Both the primary side and the secondary side can be made movable, and are used in pallet conveying devices and the like.

Thrust is generated by a traveling magnetic field created by passing an alternating current through the primary side and an eddy current generated on the secondary conductor by this traveling magnetic field.

FIG. 2 shows an example of a bottom type linear induction motor type conveyance device according to the prior art. A Wi carriage 51 includes a carrier and a linear induction motor 52 mounted on the bottom surface of the carrier. This carrier 51 includes a carrier 11'1 provided with a secondary conductor 53.
Move on 55. The support wheels 54 support the transport vehicle 51 and also support the linear induction motor 52 and the secondary conductor 53.
The gap can also be maintained by air bearings, magnetic bearings, etc. As shown in FIG.
In the part where the curve becomes uphill, the linear induction motors 52 and 2
The gap between the next conductor 53 and the linear induction motor 5
It becomes larger in the center of 2. Conversely, in the portion where the conveyance path 55 turns downhill, the gap between the linear induction motor 52 and the secondary conductor 53 becomes large at the end portion of the linear induction motor 52.

3(A) and 3(B) show an example of a side-type linear induction motor type conveying device according to the prior art.
FIG. 3 is a cross-sectional view taken along line BB in FIG. The C-shaped conveyance path 55a has a vertical secondary conductor 53, and the supporting wheels 5
4a engages with the inner surface of the C-shape, and the linear induction motor 52a
support.

The PM type conveyance table 1151 is connected to this linear induction motor 52a.
It runs above the C-shaped conveyance path 55a. 2
The next conductor 53 and the linear induction motor 52 are both arranged vertically and supported in parallel to each other. Figure 3 (
In the part where the C-shaped conveyance path is curved as shown in B), the secondary conductor 5
3 and the linear induction motor 52a becomes larger. If the curve is in the opposite direction, the gap between the secondary conductor 53 and the linear induction motor 52a becomes larger at the end portion of the linear induction motor 52a.

[Problems to be Solved by the Invention] 1 In the conveyance device using a linear induction motor according to the prior art as described above, the secondary conductor 53 facing the linear induction motor 52 is curved vertically or horizontally. In some cases, thrust may be significantly reduced.

As shown in FIGS. 4(A), (B), and (C), the linear induction motor 52 moves over a planar secondary conductor 53a, a concave secondary conductor 53b, and a convex secondary conductor 53c. When considering the thrust for each movement, it changes as shown in the table.

Shishi plane convex surface concave surface 0 However, the secondary conductor 53 is made of a laminate of an aluminum layer with a thickness of 2.5 mm and an iron layer with a thickness of 6 mm or more,
The curvature of the concave and convex surfaces was 500 mm, and the minimum gap g between the secondary conductor 53 and the linear induction motor 52 was kept constant.

That is, as shown in FIG. 4(A), the secondary conductor 53a
Assuming that the thrust force is 10 when the
It was found that when the secondary conductor 53c has a concave shape as shown in FIG. 4(C), the thrust is extremely low and becomes 1.

Therefore, in the case of a conveyance device having a linear induction motor on the bottom as shown in FIG. Thrust drops dramatically at the beginning of .

In a conveyance device having a linear induction motor on the side as shown in FIGS. Since it can be kept parallel, the gap can be kept constant, and there is no problem on uphill slopes.
When forming a concave curve toward the second side, the secondary conductor 53 forms a concave surface with respect to the linear induction motor 52, resulting in an extreme reduction in thrust force.

An object of the present invention is to prevent an extreme drop in thrust even when the conveyance path goes up and down or curves. An object of the present invention is to provide a linear induction motor type conveying device.

The present applicant has proposed a linear induction motor type conveyance device that uses a conveyance truck equipped with linear induction motors on both left and right sides.

To explain with reference to FIG. 5, the conveying device includes a conveying cart 11 having a pair of linear induction motors 12a, 12b on both sides, and a secondary side provided opposite to these linear induction motors 12a, 12b. A conveyor #115 having conductors 13a and 13b is provided.

Linear induction motors (
LIM) 12a and 12b are supplied with an AC voltage to connect the conveyance path 15.
run on top. At this time, the linear induction motors 12a, 12
The gap between b and the secondary conductors 13a, 13b is kept constant by the guide means.

When the transport vehicle 11 travels on the transport path 15 that forms a flat straight path and a hoistway, the secondary conductor 1 of the transport path 15
3a and 13b can form flat surfaces parallel to the linear induction motors 12a and 12b, so each secondary conductor 1
3a, 13b and the linear induction motors 12a, 12b have a suitable relationship as shown in FIG. 4(A).

When traveling on the conveyance path 15 that forms a curve in the horizontal plane, as shown in FIG. 5, when the left secondary conductor 13a becomes concave, the thrust of the left linear induction motor 12a decreases significantly. However, at this time, the right secondary conductor 13b has a convex shape. Therefore, the right linear induction motor 1
Although the thrust of 2b is reduced, it maintains a certain level of strength; in other words, it has linear induction motors on both sides, so
When bending left and right, the linear induction motors on both sides are in the relationship shown in FIGS. 4(B) and 4(C), respectively.

For example, in the case of the above-mentioned specific values, if the thrust when the transport vehicle 11 travels on a flat straight road is 10, the same thrust of 10 is obtained when traveling on a hoistway, and in the worst case when traveling on left and right curves, the thrust is 10. Even in the case of thrust (i + 7) ÷ 2; 4
becomes.

However, it is not easy to accurately manufacture a track having a bent portion as shown in FIG. 5, and the manufacturing cost is high.

Furthermore, even if secondary conductors are placed on the left and right, only one conductor forming a convex surface is responsible for the driving force at the bend, and the magnitude of that driving force is less than half of the driving force at the straight section. It also becomes.

Another object of the present invention is to provide a track for a linear induction motor type conveying device that is easy to manufacture, has low manufacturing costs, and can exhibit high driving force.

[Means for Solving the Problems] According to the present invention, a pair of linear induction motors are provided on both sides of a conveyance cart supported on a conveyance track of a linear induction motor type conveyance device, and these pair of linear induction motors The secondary conductors are arranged to face each other, and in the portion where the conveyance track bends left and right, the pair of left and right secondary conductors alternately change direction to form a bent portion.

[Function] Since the bent portion is formed by a collection of planar secondary conductor portions, manufacturing is easy, and half the driving force can be easily secured in each planar portion.

If there is a secondary conductor on only one side, a concave or convex surface will occur at the transition from one plane to the next, but there are secondary conductors on the left and right, and these secondary conductors By alternately using the left and right secondary side conductors, the conveying cart can be driven with substantially no concave or convex surfaces.

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

1(A) and 1(B) show an embodiment of the linear induction motor type conveyance device according to the present invention, FIG. 1(A> is a plan view of a conveyance track having a curve, and FIG. 1(B) is a FIG. 2 is a schematic diagram showing how thrust is distributed on a curved trajectory.

In FIG. 1(A), a secondary conductor 3. which defines a track is shown.
4 gradually changes direction from a portion along the y direction at the bottom of the figure to a portion along the X direction at the top of the figure. Here, when looking at the outer secondary side conductor 4 forming a curved track, it has a shape in which planar portions 4A, 4B, and 4C14D are connected at the curved portion. Further, the curved portion of the inner 1III secondary conductor 3 has a shape in which the planar portions 3A, 3B, and 3C are connected. In this way, the linear trajectory 5A is continuous with the linear trajectory 5c along the other direction via the curved trajectory 5B. Here, each planar portion 4A of the outer secondary conductor,
The interconnections of 4B, 4C54D and the planar portions 3A, 3B, 3c of the inner secondary conductor are arranged alternately with respect to each other. That is, when moving from trajectory 5a to 5b and 5c according to the shape of FIG. 1 (A>), first,
The outer secondary conductor 4D changes its direction slightly, then the inner secondary conductor 3C further changes its direction, the outer secondary conductor 4C further changes its direction, and so on. , and continues to the linear trajectory 5c.

The secondary conductor 3.4 has a plane perpendicular to the plane of the paper.

The first study describes how thrust works when a linear induction motor guided vehicle travels on a curved track connecting planar parts.
This will be explained with reference to Figure (B).

In FIG. 1(B), the first position P1 shown at the bottom of the figure
, the linear induction motor 2b on the right side of the transport vehicle 1
is placed parallel to the secondary conductor 4D, and a force F is applied in the direction of the arrow.
demonstrate. Further, at a position P2 shown in the upper part of the figure, the left side linear motor 2a of the transport vehicle 1 is arranged parallel to the planar portion 3A of the inner secondary conductor and exerts a driving force in the direction of the arrow F. In this way, on a curved track, the near motor located on one side of the transport vehicle primarily exerts the driving force to move the transport vehicle, and at the connection point switches to the driving force of the secondary conductor on the opposite side. .

By using tracks for linear induction motors as shown in Figures 1 (A) and (B), sufficient driving force for the transport vehicle can be ensured, and the manufacturing cost can be reduced by simplifying the track structure. be able to.

FIGS. 6(A) and 6(B) show specific examples of transport vehicles, transport tracks, etc. used in the above-mentioned linear induction motor type transport device; FIG. 6(A) is a front view, and FIG. 6(A) is a front view; (B) is a plan view. In these figures, the same numbers as in other figures indicate equivalent parts or elements.

The transport device is a transport cart 11. Two I-shaped members 3 with an I-shaped cross section.
It is equipped with a transport track composed of 0a and 30b. In the transport vehicle 11, the carrier 19b is suspended from the frame 19a by a connecting member. The frame 19a is supported by support wheels 14 and guided by two sets of upper and lower guide wheels 16, 17, each set of four guide wheels.

The transport vehicle 11 is driven by linear induction motors (LIMs) 12a and 12b provided on both sides of the frame 19a. The conveyance cart 11 travels along the conveyance track and conveys an object (not shown) placed on its carrier 19b.

Each of the linear induction motors 12a and L2b has a plurality of magnetic cores and a coil wound around the magnetic cores, and forms a traveling magnetic field by supplying an alternating current to the coil.

Applying alternating current to the linear induction motors 12a and 12b,
When a traveling magnetic field is generated, eddy currents are generated in the secondary conductors 13a and 13b, and a driving force is generated by interaction with the magnetic field.

The transport vehicle 11 is also provided with a current collector (not shown), which takes in alternating current voltage from a contact wire (not shown) installed on the transport track.

The conveyance track has a hollow cylindrical structure having a substantially rectangular cross section as a whole, an opening slit in the lower surface, and a hollow cylindrical structure in which the frame 19a runs.

The two ■-shaped members 30a and 30b with an I-shaped cross section constituting the secondary rpJFP (1k) are vertical members 25a and 25b, upper horizontal members 26a and 26b fixed above and below these vertical members 25a and 25b, and lower horizontal and a member 27a27b.
It is fixed to an indoor frame 35. The vertical members 25a, 25b have conductors made of iron, aluminum, etc. on at least their sides, and constitute secondary conductors of the linear induction motors 12, 12b, facing each of the linear induction motors 12a, 12b.

The frame 19a of the transport vehicle 11 is provided with two sets (one set of four guide wheels) of upper and lower guide wheels (guide means) 16,17. FIG. 6(A) shows the two upper guide wheels 17a, 17b and the two lower guide wheels 1!16a, 16b seen from one end. These guide wheels 16 and 17 are
Shaped member 30a.

30b is in contact with the inner end surfaces 28a, 28b, 29a, 29b of the horizontal members 26a, 26b, 27a, 27b.
Linear induction motor 12 and vertical member 25 which is a secondary conductor
Keep the gap between

These support wheels 14 and guide wheels 16, 17 are provided one each on the front, rear, left and right sides of the transport vehicle 11, as shown in FIG. 6(B).

Although the case where an I-shaped member having an I-shaped cross section is used has been described, instead of the ■-shaped member, a U-shaped member may be used so as to meet from both sides.

Similarly, it is also possible to use a structural member that has horizontal members above the vertical members that project on both sides, and horizontal members that project downward and only inwardly.

In this configuration, by providing guide members at the top and bottom,
The movement of the transport vehicle is stabilized.

Even if the support surface of the transport path is cut out at a branch point such as a figure 7 shape for the transport vehicle to pass through, and the support wheels partially lose their support at the cutout, the upper guide wheels cannot be connected to the end face of the upper horizontal member. By keeping them engaged, supporting force can be ensured and the transport vehicle can also be prevented from falling.

Although the present invention has been described above based on the embodiments shown in the drawings, it will be obvious to those skilled in the art that the present invention is not limited to these and can be modified in various ways within the scope of the claims. .

For example, linear induction motor 2.2b and secondary conductor 3.4
Although an example has been shown in which the guide wheels as a guide means for keeping the gap between the two wheels constant are provided on the frame 19a of the transport vehicle 11, they may be installed on the linear induction motor 12.

Further, although a suspension type is shown as a support method for the carrier 19b, a built-in type or a straddle type may be used.

Although a wheel support system is shown as a support system for the transport vehicle 11, an air levitation system or a magnetic levitation system may also be used.

The position of the support wheels is not limited to the lower part of the linear induction motor, and the number of each wheel is arbitrary.

[Effects of the Invention] According to the present invention, a linear induction motor type conveyance device is obtained that can obtain sufficient thrust even when the conveyance vehicle moves up and down and curves on a conveyance path.

Since the track is composed of a combination of planar parts, manufacturing is easy and manufacturing costs can be reduced.

Since it is easy to secure the driving force of the linear induction motor on one side even at the bent part, it is possible to prevent the thrust from decreasing excessively and to ensure good conveyance.

[Brief explanation of drawings]

1(A) and 1(B) show one actual example of the linear induction motor type conveying device according to the present invention, FIG. 1(A> is a plan view of a curved track, and FIG. 1(B) is a curved track. Fig. 2 is a side view showing an example of a conventional linear induction motor type conveying device, and Fig. 3 (A>, (B) is a conventional linear induction motor type conveyance device). Another example of the conveyance device is shown, and FIG. 3(A) is a front view;
Figure 3 (B) is a sectional view taken along the line B-B in Figure 3 (A), and Figures 4 (A) to (C) are the relationship between the shape of the secondary conductor facing the linear induction motor and the thrust force. Fig. 4 (A) is a conceptual diagram for explaining the
Figure (B) shows the case of a convex shape, Figure 4 (C) shows the case of a concave shape, and Figure 5 shows a linear induction motor photographing device equipped with linear induction motors on both sides of the conveyor cart proposed by the present applicant. FIGS. 6(A) and 6(B) show the conveyance cart and track used in the linear induction motor type conveyance device, and FIG. 6(A) is a front view.
FIG. 6(B) is a plan view. In the figure, l, 11 2.12 3.4.13 3A-3C 4A-4B 4 5 16.17 9a 9b 2 3 4 5 6 7 Transport vehicle, linear induction motor secondary conductor planar part support wheel transport track , Guide wheel (guiding means) Frame carrier opening guide surface support surface Vertical member Upper horizontal member Lower horizontal member 28° 0 5 9 End surface (guide surface) ■ Shaped member indoor mount

Claims (2)

[Claims] (1) A transport track having a transport vehicle having a pair of linear induction motors on both sides, and a pair of left and right secondary side conductors arranged to face each linear induction motor, the curved part of the transport track A linear induction motor type conveyance device comprising: a conveyance track having a plurality of planar portions in which the pair of secondary conductors alternately change directions left and right. (2) A track for a linear induction motor type transport device using a transport vehicle having a pair of linear induction motors on both sides, the pair of left and right secondary side conductors being arranged to face each linear induction motor. A conveyance track having a curved portion of the conveyance track, the pair of secondary side conductors having a plurality of flat portions in which the direction alternately changes left and right.