JPH1050519A - Transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer system which can transfer a magnetic material as object to be transferred, without touching it, and with smooth acceleration and deceleration by exciting coils wound around a transfer path in sequence. SOLUTION: A transfer path is placed in a zone for transferring a magnetic material 1 as object to be transferred. Multiple coils 2 are wound around the transfer path and are connected sequentially in series. A pulse current generator 3 is provided for exciting the coils 2. Capacitors 4 are connected between the serial connecting point of each coil and a ground, for controlling the propagation speed of the pulse current. The coils 2 are excited in sequence for magnetically attracting the objects to be transferred. The objects are transferred without touching and with acceleration and deceleration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport device capable of transporting a magnetic substance smoothly in a non-contact state with smooth acceleration and deceleration.

[0002]

2. Description of the Related Art Conventionally, in an automatic assembly process, an inspection process, and the like of various devices, a conveyed object such as a metal piece is conveyed in a predetermined section. The transport device used for this purpose places the transported object on a trolley, urges it manually and transports it by inertia, or places the transported object on an endless belt conveyor driven by a motor. There are known ones that convey by placing, and ones that convey by blowing away conveyed objects using compressed air.

[Problems to be solved by the invention]

[0003] However, in the conventional transport device, since a large acceleration acts on the transported object, it is difficult to transport the transported object which may be damaged or deformed by impact, vibration, or the like. In addition, in order to be able to smoothly carry the article in a non-contact state without suddenly accelerating or decelerating the article, the apparatus becomes complicated and large, and the cost becomes high. was there.

[0004] For this reason, for example, a conveyed object, such as a precision electronic component, which is damaged when subjected to a large acceleration or impact, or whose constants have been adjusted are shifted, is smoothly accelerated or decelerated in a non-contact state. There has been a demand for a transport device capable of transporting. Therefore, in the present invention, by sequentially exciting the coils around which the magnetic material is wound around the conveyance path, the conveyance can be smoothly accelerated and decelerated in a non-contact state with the material. It is an object to provide a device.

[0005]

According to the present invention, a plurality of coils are wound around a transport path provided in a section where a magnetic substance is to be transported, and are sequentially connected in series. Excitation by the pulse current given by the
By controlling the propagation speed of the pulse current by inserting a capacitor between the series connection point of each coil and the ground potential,
Each of the coils is sequentially excited to magnetically attract the conveyed object, and is conveyed while being accelerated or decelerated in a non-contact state.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 denotes a transport path, which is a tube having a smooth inner wall surface made of a material having a low magnetic permeability such as polypropylene or vinyl chloride.

A plurality of coils 2 are wound around the tube 1 at appropriate intervals. The plurality of coils 2
Are connected in series from the beginning of winding of the coil 2 on the entrance side to the end of winding of the coil 2 on the exit side, and the coil 2 on the exit side is connected in series.
The end of the winding is grounded. Each coil 2 has an energizing capacity for an energized pulse current, a magnetic force for magnetically attracting and moving a conveyed object, and an inductance for satisfying a condition as a transmission circuit described later. .

[0008] Then, the input side end of the transport path of the serially connected coils 2 is connected to the pulse current generator 3, the output side end is connected to the ground potential, and the coil 2 is excited by the pulse current. Like that. Then, between each series connection point of the coil 2 wound around the tube 1 and the ground potential,
Each is interposed with a capacitor 4. In such a configuration, when the whole is viewed as a transmission circuit, as shown in an equivalent circuit diagram of FIG. 2, the inductance of the transport path per unit length is L, and the capacitance with respect to the ground potential per unit length is C. It can be expressed as.

In this transmission circuit, when a pulse current having a pulse width sufficiently long with respect to the time constant of the circuit is supplied from the pulse current generator 3, a delay when the pulse current travels on a carrier path having a unit length is obtained. The time τ is given by the following equation 1, where L is the inductance of the coil and C is the capacitance of the capacitor.

(Equation 1) Therefore, by appropriately selecting the inductance of the coil and the capacitance of the capacitor, the delay time τ is set so that the coil immediately before the moving object is sequentially excited by the pulse current and magnetically attracts the object. Then, the conveyed article can be conveyed while being gradually accelerated.

Conversely, if the delay time τ is set so as to sequentially excite the coils immediately after the moving article has passed,
The conveyed material is sucked backward, and the moving speed can be gradually reduced and finally stopped. That is, according to the setting of the delay time τ when the pulse current passes through each coil, the conveyed object can be arbitrarily accelerated or decelerated, so that the conveyed object is smoothly accelerated and decelerated in a non-contact state. be able to.

When accelerating or decelerating a conveyed object by changing the electric constants of the coil and the capacitor, it is necessary to perform the operation sufficiently smoothly so as not to cause reflection of a pulse current on a circuit.

Further, the electrical constants of all the coils and capacitors are kept constant, that is, the delay time τ
May be set to be constant, and the position of the coil on the tube may be moved back and forth to arrange the coil roughly or densely, thereby accelerating or decelerating the conveyed object. In this case, since the delay time τ in each coil can be made constant, there is an advantage that mutual interference hardly occurs.However, if the coils are too close, mutual inductance may change the effective coil inductance. .

It is necessary that the output pulse of the pulse current generator 3 has a sufficiently long pulse width with respect to the delay time τ so that the waveform is not deformed. Further, it is necessary to sufficiently reduce the electrical characteristics of the transported object so as not to affect the circuit constants (L, C) as much as possible.

The present invention is not limited to the above-described embodiment of the present invention. For example, the conveying path may have a gutter-shaped upper surface opened. Even if the object to be conveyed is a non-magnetic material, it can be conveyed in the same way as a conveyed material of a magnetic material if it is stored in a magnetic material container or placed on a magnetic material tray. it can.

[0015]

The present invention is embodied in the form described above and has the following effects.

By sequentially exciting a plurality of coils arranged in the transport path to magnetically attract and accelerate or decelerate the transported object, any acceleration or deceleration can be performed without contacting the transported object. You can slow down. Therefore, by appropriately setting the delay time of the pulse current in each coil or the position of the coil on the conveyance path, without giving a sudden acceleration to the conveyed object, the object accelerates smoothly, maintains a constant speed, and further smoothly It can be decelerated and stopped.

By applying a pulse current to the coil on the entrance side of the transport path, the pulse current sequentially propagates through each coil with a preset delay time. Therefore, when conveying a conveyed object, there is no need to consider the timing of exciting each coil at all, so that the circuit configuration is simple and the cost is low. Thus, by placing a conveyed object at the entrance side of the conveyance path and applying a pulse current having a predetermined waveform to the coil, each coil can be sequentially excited with a predetermined delay time, thereby giving vibration, impact, and the like. In addition, it is possible to smoothly accelerate and decelerate the conveyed object and convey it along the conveying path.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a transport device of the present invention.

FIG. 2 is an equivalent circuit diagram of the transfer device of the present invention.

[Explanation of symbols]

 1 Conveyance path 2 Coil 3 Pulse current generator 4 Capacitor

Claims (6)

[Claims] 1. A transport path provided in a section where a magnetic material is to be transported, a plurality of coils wound around the transport path and connected in series, and an entrance of the transport path to the plurality of coils. A pulse current generator that energizes the pulse current from the coil on the side and sequentially excites the pulse current, and controls the propagation speed of the pulse current that is interposed between the series connection point of each coil and the ground potential and propagates through each coil A transport device comprising: a condenser; 2. The transfer device according to claim 1, wherein the transfer path is a tube made of a material having a small magnetic permeability. 3. The transfer device according to claim 2, wherein the tube is made of a synthetic resin having a smooth inner wall. 4. The apparatus according to claim 1, wherein the conveyed material is gradually accelerated and moved at a high speed at an entrance side of the conveying path,
A transport device wherein a pulse current propagation speed is set so as to gradually decelerate an article moving at a high speed on an exit side. 5. The method according to claim 1, wherein the delay time of each coil is varied by changing the product of the inductance of the coil and the capacitance of the capacitor for each coil to accelerate or decelerate the load. A conveying device characterized by the above-mentioned. 6. The apparatus according to claim 1, wherein the product of the inductance of the coil and the capacitance of the capacitor is fixed for each coil, and the conveyed object is accelerated or decelerated by changing the position of the coil. Transfer device.