JPS62225108A - Conveyor of magnetic levitation type - Google Patents

Abstract

PURPOSE:To enable the deviation of a conveyor from a conveying passage, to be easily detected, by arranging a plurality of conductors insulated mutually on auxiliary rails and conducting auxiliary wheels in a non-contact state, and by setting a deviation detecting circuit between the conductors. CONSTITUTION:A conveyor 5 is magnetically levitated by guide rails 2 and a magnetic bearing device 4, and is run by the stator 7 of a linear induced power machine fitted on a frame unit 3 and the secondary conductor plate 8 of a linear induction motor fitted on the conveyor. In the meantime, on the frame unit 3, auxiliary rails 9 formed in '['-shapes are fitted, and on the conveyor 5, auxiliary wheels 10 having conductivity on the outer peripheral surfaces are fitted. On the auxiliary rails 9, mutually insulted conductors 11 are fitted, and when the conveyor 5 is deviated from a conveying passage and the auxiliary wheels 10 and the auxiliary rails 9 come into contact with each other, then the conductors 11 are short-circuited, and the output of detection signal is generated from a deviation detecting circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetically levitated transport device, and particularly to a device for detecting abnormal running of a transport vehicle.

(Prior Art) In recent years, as part of office automation (OA) or factory automation (FA), slips and documents have been transmitted between multiple points indoors.

2. Description of the Related Art Automatically transporting cash, materials, workpieces, parts, etc. using a transport device is widely practiced.

A conveyance device used for such conveyance is required to convey the object quickly and quietly. In particular, transport devices used in clean rooms are also required to minimize dust generation. Therefore, among this type of conveyance apparatus, a floating conveyance apparatus in which auxiliary wheels attached to a conveyance vehicle run in a non-contact manner on auxiliary rails provided on a frame of a conveyance path is attracting attention. Air or magnetism is generally used as this levitation method, but the method using magnetism is the most promising method because it has excellent followability to guide rails and noise reduction effect.

(Problems to be Solved by the Invention) In order to fully demonstrate the performance of the magnetic levitation transport device as described above, it is necessary to run the auxiliary wheels of the transport vehicle completely without contact with the auxiliary rails. becomes important.

Therefore, when the conveyance vehicle deviates from the conveyance path and the auxiliary wheels of the conveyance vehicle come into contact with the auxiliary rails, it is important to easily and quickly detect this from the outside, and the realization of this has been strongly desired.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetically levitated conveyance device that can easily detect from the outside that a conveyance vehicle has deviated from a conveyance path.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a method in which a guide rail made of a ferromagnetic material is disposed on a frame provided along a conveyance path and forms a conveyance path. The transport vehicle is equipped with a magnetic support device facing the guide rail and is guided by a frame body so that it can travel freely.The transport vehicle is equipped with auxiliary wheels, and the auxiliary wheels are attached to the frame body in a non-contact manner when the transport vehicle floats. In a magnetic levitation type transport device that is provided with an auxiliary rail that guides the transport vehicle in a state that prevents the transport vehicle from deviating from the transport path, the auxiliary rail is provided with a plurality of conductors that are mutually insulated and that guide the auxiliary wheels in a non-contact state. , a deviation detection circuit is provided between these conductors.

(Function) When the transport vehicle is normally traveling on the transport path, the auxiliary wheels are located in the middle of the auxiliary rail and do not contact the conductor, so the deviation detection circuit does not operate. However, if the conveyance vehicle deviates from the conveyance path and travels abnormally, the auxiliary wheels come into contact with the conductor, so the deviation detection circuit operates, and this deviation can be detected from the outside.

(Example) Hereinafter, an example of the magnetic levitation type conveyance device of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a magnetically levitated conveyance device 1 is supported along a conveyance path by a support device or a supporting steel structure (not shown), is formed into an inverted U-shape, and has a ferromagnetic material on the top. A frame body 3 to which a guide rail 2' is attached, a conveyance vehicle 5 that is magnetically levitated and movable by a magnetic support device 4 provided opposite to the guide rail 2 to maintain a predetermined gap, and a frame body 3. A stator 7 of a linear induction machine is inserted downward into an opening 3a provided at an appropriate interval in the upper center of the body 3 and is lined with a top plate 6, and a transport vehicle 5 is placed opposite the stator 7. The secondary conductor plate 8 of the linear induction motor is attached to the secondary conductor plate 8 of the linear induction motor; It is attached to the auxiliary rail 9 so that it is not in contact with the middle part of the auxiliary rail 9 while traveling, is latched to the auxiliary rail 9 when the transport vehicle 5 is about to deviate from the transport path, and has at least an outer peripheral surface that is conductive. an auxiliary wheel 10 formed in a
It consists of a deviation detection circuit 12 connected between two conductors 11. The transport vehicle 5 includes a power supply device (not shown) that supplies power to the magnetic support device 4 and a control device (not shown) that controls the magnetic support device 4 to maintain a predetermined gap with respect to the guide rail 2. ) is installed.

Therefore, the deviation detection circuit 12 described above has two conductors 1
It is composed of a constant voltage power supply 13 connected between 1 and 11, a fixed resistor 14 and an ammeter 15 connected between the constant voltage power supply 13 and the conductor 11. FIG. 3 shows this circuit.

In the above embodiment, the deviation detection circuit 12 detects the contact between the lower part of the auxiliary rail 9 and the auxiliary wheel 10, but by attaching the conductor 11 to the top or side of the auxiliary rail 9, it is possible to 5 can detect upward or lateral contact.

However, when detecting lateral contact, a lateral auxiliary wheel is required.

In addition, by providing two conductors ii and 1i on each side of the auxiliary rails 9°9, it is possible to detect only when the auxiliary wheels 10, 10 of the transport vehicle 5 contact the auxiliary rails 9, 9 on both sides. You can also do

Roughly speaking, by using conductors having a constant resistance value per unit length as the two conductors 11 and 11, a circuit such as that shown in FIG. 4 can be obtained. In this case, the transport vehicle 5
Depending on the position where the auxiliary wheel 10 contacts the auxiliary rail 9,
Since the resistance value in the closed loop circuit is known, it is also possible to detect the position of contact based on the current value measured with an ammeter. A signal may be transmitted from the current meter 15 at a predetermined time to light up an indicator light, or an indicator light may be connected in place of the ammeter 15 to display only when the transport vehicle 5 has deviated.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to accurately detect an abnormal condition such as a conveyance vehicle coming into contact with an auxiliary rail from the outside, and to eliminate dust that causes indoor air pollution. It is possible to provide a magnetic levitation type conveyance device that fully utilizes the advantages of a levitation type conveyance vehicle by eliminating the generation of particles and foreign matter, and has improved reliability and operational effectiveness.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the magnetic levitation type conveyance device of the present invention, FIG. 2 is a perspective view showing main parts of an embodiment of the present invention, and FIG. Equivalent circuit diagram of main part, 4th
The figure is an equivalent circuit diagram of a main part of another embodiment of the present invention. 2... Guide rail 3... Frame 4... Magnetic support device 5... Transport vehicle 7... Stator of linear induction motor 8... Secondary conductor plate 9... Auxiliary rail 10 ... Auxiliary wheel 11 ... Conductor 12 ... Deviation detection circuit agent Patent attorney Nori Chika Ken Yudo Hirofumi Mitsumata Figure 2 Figure 8 Figure 4

Claims (1)

[Claims] A guide rail made of a ferromagnetic material is disposed on a frame provided along the conveyance path and forms the conveyance path, and a magnetic support device is provided opposite to the guide rail, and the vehicle is guided by the frame. The transport vehicle is provided with auxiliary wheels, and the frame body is provided with auxiliary rails for guiding the auxiliary wheels in a non-contact state when the transport vehicle floats, and the transport vehicle is provided with In the magnetic levitation conveyance device that prevents deviation of the auxiliary wheels, the auxiliary rail is provided with a plurality of conductors that are mutually insulated and are mutually electrically connected by contact with the auxiliary wheels, and a deviation detection circuit is provided between the conductors. A magnetic levitation transport device featuring: