JPH0442214Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cart structure for a magnetically levitated conveyance device for conveying small items, etc. in a manufacturing line or the like.

[Conventional technology]

An attraction type magnetically levitated vehicle travels without contact using the levitation force obtained by an electromagnet that is attracted to an armature rail on the ground side. The structure of this type of suction type magnetically levitated cart driven by a linear motor is disclosed in Japanese Patent Publications No. 12801/1983 and Japanese Patent Publication No. 12801/1983.
There is one described in Publication No. 20202. Such conventional magnetic levitation conveyance devices have a structure in which levitation and traveling electromagnets and sensors are mounted on the slider (carriage) side. Because of these ancillary equipment,
There was a problem in that the weight of the truck increased and the vibration amplitude increased due to a decrease in the natural frequency of the truck.
In addition, since it is necessary to supply enough power to support the weight of the heavy truck, the current value increases.
There were drawbacks such as increased heat generation.

In order to avoid these drawbacks, a configuration can be considered in which the levitation and running electromagnets and sensors are fixed on the rail side, and the inductor is placed on the bogie side.

FIG. 3 shows an example of a configuration in which an inductor is placed on the cart side. In the figure, a linear motor 2 is provided on the upper surface of a T-shaped rail 1, and upper levitation electromagnets 3, 3 are provided on the lower surface, and the linear motor 2 and levitation electromagnet 3,
A channel-shaped cart 4 is disposed in a state having three magnetic poles and a predetermined space, and is configured to be moved by a linear motor 2 and an inductor 5. The channel-shaped truck 4 is formed by an upper horizontal part 41 forming an inductor 5, both side parts 42, and a lower horizontal part 43, and between the levitation electromagnets 3, 3 and the lower horizontal parts 43, 43. , a gap sensor 6 are provided.

[Problem that the invention attempts to solve]

By the way, when adopting such a channel-shaped truck structure, in order to improve the natural frequency while reducing the weight of the truck, it is necessary to design the truck in consideration of vibration modes.

That is, if the truck is constructed from a simple combination of flat plates, deformation will occur due to various vibration modes, as shown in FIG. Figure 4a shows the bending of the upper horizontal part 41, and b shows the upper horizontal part 4.
1 shows the deformation due to the twist, c shows the deformation due to the imbalance of left and right stress in the lower horizontal part 43, and d shows the deformation due to the imbalance in the longitudinal stress of the lower horizontal part 43.

The present invention was devised in view of these conventional problems, and aims to strengthen and reduce the weight of the bogie against deformation as shown in Figure 4 a to d, and also increases the natural frequency. The purpose is to suppress vibration.

[Means for solving problems]

To achieve this purpose, the magnetic levitation trolley structure of the present invention has a linear motor disposed at the top of a T-shaped rail, and a levitation electromagnet disposed at the bottom. In a magnetic levitation conveyance device in which a channel-shaped cart reinforced with grooves and protrusions on each side is installed through the air, the protrusions are formed perpendicularly to the running direction of the cart and in a cross-over shape. It is characterized by

〔Example〕

Hereinafter, the present invention will be specifically explained based on the embodiments shown in FIGS. 1 and 2.

As shown in FIG. 1, in the present invention, the upper horizontal part 41 and the side parts 42 of the trolley 4 are made of a lightweight good conductor such as a ferromagnetic material or an aluminum alloy, and correspond to the part facing the linear motor, that is, the inductor 5. This part forms a real part having an actual cross-sectional area sufficient to be used as a secondary conductor, a carved groove part 7 for weight reduction, and a convex part 8 for ensuring rigidity.
Lower horizontal part 43 which is an attracting body made of ferromagnetic material
is made to face the levitation electromagnet 3 and float by attraction, leaving a cross-sectional area sufficient to form a magnetic path as a real part, and forming grooves 7 similar to the upper horizontal part 41 and the side parts 42. There is.

FIG. 4 is a plan view showing an example of the structure of the groove portion 7 and the convex portion 8 in the upper horizontal portion 41. As shown in FIG. The shapes of the grooves 7 and the protrusions 8 are arranged in accordance with the various vibration modes shown in FIG. 4, so that the protrusions 8 effectively act as reinforcing ribs. That is, among the vibration modes shown in FIG.
1, the upper horizontal portion 41
It is necessary to consider reinforcement of The convex portions extending in the horizontal direction shown in FIG. 2, that is, in the direction orthogonal to the traveling direction of the truck 4, are configured to play a reinforcing role in the mode shown in FIG. 4a. The cross-over convex portions shown in FIG. 2, that is, diagonal reinforcement, are reinforcement for the mode b in FIG. 4. By applying similar reinforcement to the side portions 42 and lower horizontal portion 43, it is possible to cope with the modes c and d in FIG. 4.

[Effect of idea]

As described above, the present invention provides the following effects.

Deformation due to bending or twisting of the upper horizontal part of a channel-shaped cart in a magnetic levitation transport device,
Reinforcement and weight reduction can be achieved to prevent deformation due to left-right stress imbalance in the lower horizontal part and deformation due to front-rear stress imbalance in the lower horizontal part, while maintaining the effective cross-sectional area of the suction body and secondary conductor. improvement in numbers can be achieved.

By reducing the weight of the truck, the gain and response of the floating electromagnet control can be increased, and the acceleration and deceleration of the slider can be made faster.

Furthermore, since the current value of the levitation or running electromagnet can be reduced, the amount of heat generated can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of an embodiment of the present invention, FIG. 3 is a cross-sectional view showing the structure of a magnetic levitation cart to which the present invention is applied, and FIG. The figure is an explanatory diagram showing an example of vibration modes. 1... Rail, 2... Linear motor, 3... Levitating electromagnet, 4... Channel-shaped truck, 41...
Upper horizontal part, 42... Side part, 43... Lower horizontal part, 5... Inductor, 6... Gap sensor,
7...Groove portion, 8...Protrusion portion.

Claims (1)

[Scope of utility model registration request] A linear motor 2 is arranged at the upper part of a T-shaped rail 1, and a levitation electromagnet 3 is arranged at the lower part, and the rail 1 has a groove part 7 and a convex part 8 in an upper horizontal part 41, both side parts 42, and a lower horizontal part 43, respectively. In a magnetic levitation transport device in which a reinforced channel-shaped cart 4 is installed through the air, the convex portion 8
A trolley structure for a magnetic levitation conveyance device, characterized in that the wheels are formed perpendicular to the running direction of the trolley 4 and in a cross-over manner.