JPH0357763A - Load transporting device - Google Patents

Abstract

PURPOSE:To prevent the reckless traveling of a mobile flat car by installing an overvoltage detecting means for detecting that the between terminal voltage of a traveling motor becomes overvoltage and a stop means for separating the traveling motor from a feeder line by the detection signal, into a driving device. CONSTITUTION:If an electric power source for supplying electricity into a feeder rail 35 drops, during a mobile flat car drives a motor 11 and descends, supply of electricity into the motor 11 is suspended, and the motor 11 generates a regenerative voltage, and a dc control control power source which is rectified by a diode bridge 42 is put into an overvoltage state. Then, an overvoltage detecting circuit 46 operates to turn OFF a drive power relay 41 through transistors 47 and 45. Then, the motor 11 is cut off from the electric power source, and stops, and the reckless traveling of the mobile flat car is prevented, and the supply of electricity is restarted, and the mobile flat car is restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a load conveying device used, for example, when conveying loads between spaces within a building and between floors.

BACKGROUND OF THE INVENTION A conventional load conveying device of this type is disclosed in Japanese Patent Application Laid-open No. 50-1, for example.
As disclosed in Japanese Patent No. 13985, a plurality of transport vehicles are provided which are supplied with power from a power supply rail to rotate a traveling motor and travel on a rail device, and when a transport vehicle collides with the rear, the front and rear surfaces of the transport vehicle are A relay is activated when a conductive piece provided on the part comes into contact with the vehicle, and the relay operates to turn off the power supply line of the motor, thereby stopping the conveyance vehicle that rear-ended the vehicle.

Problems to be Solved by the Invention However, in the conventional structure, if the power supply connected to the power supply rail fails while the transport vehicle is moving down between floors by driving the motor, the motor does not generate regenerative voltage. In order to supply a control voltage to the travel command beam, the motor is kept in a driving state, and as a result, the transport vehicle does not stop and runs out of control, accelerating and falling due to its own weight, resulting in a collision.

The present invention is intended to solve the above-mentioned problems, and aims to provide a cargo transport device that prevents a transport vehicle (self-propelled vehicle) from running out of control when the power supply is cut off.

Means for Solving the Problems In order to solve the above problems, the load conveyance device of the present invention includes a traveling motor and its drive device that are supplied with power from a power supply rail provided in a rail device, and that is guided by the rail device. A self-propelled trolley that travels on a fixed route by the drive of the travel motor is provided, and overvoltage detection means for detecting that the voltage across the travel motor becomes an overvoltage is provided in the drive device, and detection by the overvoltage detection means A stop means is provided for disconnecting the traveling motor from the power supply line in response to a signal.

Effect With the above structure, when the voltage across the traveling motor becomes overvoltage due to regeneration of the traveling motor due to power supply to the power supply rail dropping while the self-propelled bogie is descending, for example, the overvoltage detection means detects the overvoltage, and the stopping means detects the overvoltage. disconnects the travel motor from the power supply line based on the overvoltage detection signal. Therefore, the traveling motor is stopped and the self-propelled cart is prevented from running out of control.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a partially cutaway side view of the load conveying device of the present invention, and FIG.
The figure is a front view of the load conveyance device of the present invention.

The self-propelled trolley 1 includes a pair of left and right first wheels 4 rotatably attached to a main body 2 via an axle 3, and a first wheel 4 mounted on the main body 2 at a position away from the first wheels 4 in any direction along a fixed path 5. axle 6
a pair of left and right second wheels 7 which are freely rotatably mounted through the
a wheel 8 for regulating the movement of the ram attached to both axles 3.6; a rotating propulsion wheel (friction rotating wheel) 10 attached to the main body 2 via a drive shaft 9 near the first wheel 4; A motor 11 attached to the main body 2, a gear speed device 12 that interlocks and connects the motor 11 and the drive shaft 9, a pinion gear 14 attached to the drive shaft 9, and a pair of left and right gears attached to the lower part of the main body 2. It consists of a collector 15, bumpers 16A and 16B attached to the front and rear parts of the main body 2, a storage container 17 attached to the upper part, a destination setting device 18 attached to the side of the main body 2, etc. The motor 11 and the speed reducer 12 form a travel drive section 13.

Reference numeral 31 denotes a rail device that supports and guides the self-propelled trolley 1, and contacts the first travel guide surface 32 that contacts the first wheel 4C from above, and the second wheel 7 and the propulsion rotating wheel 10 from below. It has a second travel guide surface 33 and a third travel guide surface 34 that contacts the lateral movement regulating wheel 8 from the outside, and the second travel inner surface 33 has a pair (2 A power supply rail 35 (main) and a hook 36 with which the pinion gal 14 engages along an inclined path or the like are provided.

To run the self-propelled trolley 1, power is supplied from the power supply rail 35 via the collector 15 to the travel drive control device 21 provided in the main body 2, and this travel drive control device 21 performs on/off control of the motor 11. Speed device 12 takes into account the rotational force of 11.
, is transmitted to the propulsion rotating wheel 10 via the drive shaft 9, and the propulsion rotating wheel 10 is pressed and rolled on the second travel guide surface 33.

FIG. 3 shows a circuit diagram of the traveling drive control device 21.

The DC reversible power supplied from the power supply rail 35 through the collector 15 is supplied to the motor 11 through the contacts of the drive power relay 41, and is also supplied to the motor 11 through the contacts of the drive power relay 41.
has been input to. 43 is a thermal relay, which is provided to prevent the power supply from the power supply rail 35 from dropping due to an abnormality such as a power short circuit within one self-propelled vehicle 1.

The output of the diode bridge 42 is smoothed by a filter 44 to reduce noise and form a DC control power source, which is supplied as a power source to the driving power relay 41 and the like. The drive power relay 4l is excited by the conduction of the transistor 45 to drive the motor 11, and the transistor 45 is turned on by an overvoltage detection signal or a stop command signal output from the overvoltage detection circuit 46, which will be described later. ), the driving power relay 41 is excited. That is, the drive power relay 41 is energized when no overvoltage is detected and the stop command is off, that is, when it is a travel command, and drives the travel motor l1.

The overvoltage of the DC control power supply is monitored by an overvoltage detection circuit 46, and when the overvoltage detection circuit 46 detects an overvoltage, it outputs an overvoltage detection signal to the transistor 47.

The operation of the circuit structure described above when the self-propelled trolley 1 drives the motor 11 and supplies power to the power supply rail 35 while descending is interrupted will be described.

When the motor 11 is no longer supplied with power, the motor 1l generates a regenerative voltage, and the DC control power supply rectified by the diode bridge 42 enters an overvoltage state, the overvoltage detection circuit 46 operates, and the drive power relay 41 is turned off. Therefore, the motor 11 is disconnected from the power supply fin, the motor 11 is stopped, and runaway of the self-propelled cart 1 can be prevented. Then, when the power supply is restarted, the self-propelled trolley 1 is restarted.

In this way, even if the power supply is cut off while the self-propelled vehicle 1 is descending, runaway of the self-propelled vehicle 1 can be prevented. , a collision between the self-propelled carts 1 can be avoided.

Effects of the Invention As described above, according to the present invention, when the voltage at both ends of the traveling motor becomes overvoltage, this is detected and the traveling motor is disconnected from the power supply line, so that the power supply is cut off while the self-propelled bogie is descending, and the regeneration is stopped. Even if a voltage is generated, the traveling motor can be stopped, and it is possible to prevent the self-propelled cart from accelerating and falling due to its own weight and colliding.

[Brief explanation of drawings]

The drawings show one embodiment of the load conveying device of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a front view, and FIG. 3 is a circuit diagram of a traveling drive control device. ... Power supply rail, 41 ... Drive power relay, 46
...Overvoltage detection circuit.

Claims (1)

[Claims] 1. A self-propelled cart is provided, which is equipped with a traveling motor and its drive device that are supplied with power from a power supply rail provided in a rail device, and is guided by the rail device and travels on a fixed route by the driving of the traveling motor, A load conveying device comprising, in a drive device, an overvoltage detection means for detecting that the voltage across the traveling motor becomes an overvoltage, and a stop means for disconnecting the traveling motor from a power supply line based on a detection signal from the overvoltage detection means.