JPS6361241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking and stopping method for transporting a magnetic material such as a steel plate using the linear propulsive force of a linear motor, and braking and stopping the magnetic material using the electromagnetic force of the linear motor.

This transportation method uses a linear motor as the motor primary side, the transported object as the motor secondary side, and uses electromagnetic force to apply a linear thrust to the transported object along the top surface of the linear motor. This type of conveying device is designed to convey objects on parallel rollers, and electrical braking methods such as dynamic braking or regenerative braking have been tried as a means of stopping the conveyed object, but these methods are quite difficult. The inertial force is large when transporting a heavy steel plate, etc., and it is insufficient as a means for accurately stopping the steel plate at a predetermined position.Therefore, there is currently a need for the development of an appropriate stopping method.

The present invention was developed in view of the above, and uses the electromagnetic force (attractive force) of a linear motor to generate the required suction force by adjusting the gap between the conveyed object and the conveyed object. The purpose is to provide a new stopping method that can stop the vehicle accurately and without any problems, and will be described below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, where _M1 is a linear motor for conveyance, R is a roller for supporting the conveyed object W such as a steel plate, and the motor _M1 is connected to the conveyed object W on the roller R. In contrast, it is deployed with the required space Ca,
As is well known, the conveyed object W is caused to move straight in the direction of the arrow by the magnetic field formed by energization. _M2 is a linear motor located at a predetermined stop position (hereinafter simply referred to as a stop linear motor), and is equipped with a lifting device B. This elevating device B can use appropriate means, such as an actuator that performs linear reciprocating motion by a screw mechanism rotated by an electric motor, or an air cylinder as shown in the figure _. Although a required gap Ca is provided for the conveyed object W on R, when the linear motor M2 is stopped, the lifting device B raises the linear motor _M2 to create a small gap, that is, a braking gap Cb. An appropriate sensor S, such as a photocell type, is installed at a suitable location in front of the vehicle ₂ to detect the passage of an object to be conveyed.

As a result, when the leading edge of the conveyed object W that is being transported straight on the rollers R based on the operation of the conveyance linear motor _M1 passes above the sensor S, a detection signal from the sensor is sent to the stop linear motor _M2 to move up and down. The linear motor M 2 is applied to the device B to raise the linear motor M ₂ to a gap Cb where enough suction force can be obtained to offset the thrust against the transported object W, and the transported object is stopped by braking.

By configuring as described above, it is possible to improve the braking and stopping performance by making the attraction force generated with the same current greater during braking and stopping than during driving.

In the above embodiment, when transporting the transported object W further backward, each linear motor _M2 is moved to the transported object W in the same way as the transport linear motor _M1 without operating the lifting device B. For a given gap Ca
Needless to say, it maintains the same function as the transport linear motor _M1 .

As described above, according to the present invention, the distance between the linear motor _M2 in the stopped position and the conveyed object W is set to a small braking gap Cb, and the suction is stopped by the suction action of electromagnetic force. When stopping, it can be stopped by braking to buffer against the thrust of the transported object W, and the stopping position is accurate because it is held by suction force, and it has many advantages such as being simple in structure. have

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an embodiment of the present invention. B... Lifting device, Ca, Cb... Gap, D... Distance piece, M ₁ ... Linear motor for transportation,
_M2 ... Linear motor for stopping, R... Support roller, S... Sensor, W... Object to be transported.

Claims (1)

[Claims] 1. In a conveyance device that conveys a conveyed object having a magnetic material such as a steel plate by applying thrust with a linear motor, the linear motor is configured to be movable up and down, and the linear motor and the conveyed object are connected. A braking/stopping method for conveying a steel plate or the like using a linear motor, characterized in that the gap is adjustable, the gap is made larger when the conveyed object is accelerated, and is made smaller when the conveyed object is stopped by braking.