JP2003095600A - Transfer vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a battery exhaustion due to leaving a power switch turned on. SOLUTION: A protective means is provided. This protective means comprises a plurality of sensors 11A to 11D, which detect the operation states of a plurality of drive sections, and a switch control section 8 which turns the power switch 6 off automatically when it is concluded that all of the drive sections are suspended based on the detection results of the sensors 11A to 11D.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a transfer vehicle for transferring a predetermined object.

[0002]

2. Description of the Related Art A large number of burn-in boards used for aging tests of semiconductor integrated circuits are stored in a burn-in test device in a state of being stored in a carrier rack in large numbers. Conventional transfer vehicles that transport such burn-in boards (that is, carrier racks) use a battery-powered lift mechanism to move the carrier rack that contains the burn-in board mounted on the mounting table up and down. Let This lift mechanism has a structure that a user manually operates the power switch, and there is a problem that "battering up" due to forgetting to turn off the power switch can easily occur.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent a battery from rising due to forgetting to turn off the power switch.

[0004]

In order to achieve the above object, the present invention provides, as a first means, a transfer vehicle which operates using a battery as a power source and conveys an object,
A means of providing a protection means for preventing the battery from rising due to forgetting to turn off the power switch is adopted.

As the second means, in the first means, the protection means includes a plurality of sensors for detecting the operating states of the plurality of drive sections, respectively, and all drive sections based on the detection results of the sensors. Means for automatically shutting off the power switch when it is determined to be in a stopped state for a predetermined time.

As a third means, in the above-mentioned first means, the protection means is a switch control section that automatically shuts off the power switch after a lapse of a certain time after the power switch is turned on. To do.

As a fourth means, in any one of the above-mentioned first to third means, a warning means is further provided, and the warning means is operated to notify the surroundings that the power switch has been forgotten.

As a fifth means, in any one of the above first to fourth means, the object is a carrier rack for accommodating a burn-in board.

As a sixth means, in any one of the above second to fifth means, the drive unit is a lift mechanism for vertically moving a wheel, a brake of the wheel, and a mounting table on which an object is placed. This means is adopted.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a transfer vehicle according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of this embodiment,
2 is a block diagram showing the control configuration of this embodiment. In these FIGS. 1 and 2, reference numeral X is a carrier rack, 1 is a mounting base, 2 is wheels, 3 is a handle, and 3A
Is a lift switch, 4 is a warning light, 5 is a battery, 6 is a power switch, 7 is a lift mechanism, 8 is a switch controller, 9 is a brake, 10 is a latch mechanism, 11A is a lift sensor,
11B is a brake sensor, 11C is a wheel sensor, 11D.
Is a latch sensor, and 12 is a buzzer. The switch control unit 8, the lift sensor 11A, the brake sensor 11B, the wheel sensor 11C, and the latch sensor 11D form a protection means H, and the warning lamp 4 and the buzzer 12 form a warning means W.

As shown in FIG. 1, in this transfer vehicle, the wheels 2 are rotated by being pushed by the operator, and the loading table 1 is rotated.
The carrier rack X placed on the top is transported. The carrier rack X accommodates a plurality of burn-in boards, and is accommodated in a burn-in test device for performing an aging test on a plurality of semiconductor integrated circuits mounted on each burn-in board. The mounting base 1 is a portion on which such a comparatively heavy carrier rack X is mounted, and is vertically moved by the operation of the lift mechanism 7 based on the operation of the elevating switch 3A. A warning light 4 is provided on the upper part of the transfer vehicle. A buzzer 12 is additionally attached to the warning light 4.

Further, as shown in FIG. 2, the lift mechanism 7
Is supplied with power from the battery 5 via the power switch 6, and the lift mechanism 7 is operated by the lift sensor 1.
Monitored by 1A. The wheel 2 is provided with a brake 9, which is operated by operating the handle 3. The operation of the brake 9 is monitored by the brake sensor 11B. The rotation of the wheel 2 is monitored by the wheel sensor 11C, and the operation of the latch mechanism 10 is monitored by the latch sensor 11D. The latch mechanism 10 is for fixing the transfer vehicle to the burn-in test apparatus.

That is, in this transfer vehicle, the operations of the wheels 2, the lift mechanism 7, the brake 9 and the latch mechanism 10, which are the drive units, are detected by the respective sensors and are input to the switch control unit 8 as detection signals. The switch control unit 8 controls ON / OFF of the power switch 6 based on these detection signals, and also controls the operation of the warning light 4 and the ringing of the buzzer 12.

Next, the operation of the transfer vehicle thus constructed will be described. The transfer vehicle conveys the carrier rack X to the burn-in test device with the carrier rack X placed on the mounting table 1. When the transfer vehicle is positioned at a predetermined position with respect to the burn-in test device, the latch mechanism 1
Fixed to the burn-in test equipment by 0. In this state, the elevating switch 3A is operated, the lift mechanism 7 is operated, the height position of the carrier rack X is set to the height of the storage port of the burn-in test device, and the carrier rack X is stored in the burn-in test device.

When the transfer and storage work is completed, the transfer vehicle is left in a predetermined storage place or the like. Here, the operator manually turns off the power switch 6.
If the state is not set, the transfer vehicle operates as follows.

That is, the switch control unit 8 automatically shuts off the power switch 6 when it is determined that all the driving units are in the stopped state for a predetermined time based on the detection signals of the respective sensors. For example, when all of the wheel 2, the lift mechanism 7, the brake 9 and the latch mechanism 10 are in a stopped state for one hour, the power switch 6 is automatically shut off. Since the switch control unit 8 monitors the stopped state of all of the plurality of drive units for a predetermined time, the switch control unit 8 more accurately determines the left state of the transfer vehicle.

When the switch control section 8 judges that all the driving sections are in a stopped state for a predetermined time, in addition to the automatic shutoff of the power switch 6, the warning lamp 4 and the buzzer 1 are provided.
Turn on 2. As a result, the warning light 4 is turned on and the buzzer 12 sounds, thereby notifying the surroundings that the transfer vehicle is left in the state of forgetting to turn off the power.

According to this embodiment, the power switch 6 is automatically shut off even if the power is left in the state of being forgotten to turn off the power, so that the "battery rise" of the battery 5 can be surely prevented. Further, since the warning light 4 and the buzzer 12 inform the surroundings that the power has been forgotten to be turned off, it is possible to inform the surrounding workers and the like of the occurrence of the situation of forgetting to turn off the power.

The present invention is not limited to the above embodiment, and the following modifications can be considered. (1) Without providing the various sensors described above, the switch control unit 8 is configured to automatically shut off the power switch 6 after a certain period of time has passed since the power switch 6 was turned on. In this case, the fixed time is set in consideration of the time required to transport the carrier rack X to the burn-in test device. (2) The warning means W does not have to be composed of the warning lamp 4 and the buzzer 12, and it is conceivable to use either one. (3) The present invention is not limited to the above-described carrier rack X transfer, but can be applied to a transfer vehicle that transfers various objects.

[0021]

As described above, according to the present invention,
Since the protection means is provided, it is possible to reliably prevent the battery from rising due to forgetting to turn off the power switch.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an embodiment of the present invention.

FIG. 2 is a block diagram showing a control configuration of an embodiment of the present invention.

[Explanation of symbols]

X: Carrier rack 1 ... Mounting platform 2 ... wheels 3 ... Handle 3A ... Lift switch 4 ... Warning light 5 ... Battery 6 ... Power switch 7 ... Lift mechanism 8: Switch control unit 9 ... Brake 10: Latch mechanism 11A ... lift sensor 11B ... Brake sensor 11C ... wheel sensor 11D ... Latch sensor 12 …… Buzzer H ... Means of protection W: Warning means

Claims (6)

[Claims] 1. A transfer vehicle which operates using a battery (5) as a power source and conveys an object, and which is provided with a protection means (H) for preventing the battery from rising due to forgetting to turn off the power switch (6). A transfer vehicle characterized by. 2. The protection means (H) includes a plurality of sensors (11A to 11A) for respectively detecting the operating states of the plurality of drive units.
D) and a switch control unit (8) that automatically shuts off the power switch (6) when it is determined that all the driving units are in a stopped state for a predetermined time based on the detection results of the sensors (11A to 11D). The transfer vehicle according to claim 1, characterized in that 3. The protection means (H) is configured such that when a certain time has elapsed after the power switch (6) was turned on,
2. The transfer vehicle according to claim 1, which is a switch control unit (8) that automatically shuts off the power switch (6). 4. The warning means (W) is further provided, and the warning means (W) is operated to inform the surroundings that the power switch (6) has been forgotten to be turned off. Transfer car. The transfer vehicle according to claim 4, wherein: 5. The transfer vehicle according to claim 1, wherein the object is a carrier rack (X) that houses a burn-in board. 6. The drive unit is a lift mechanism (7) for vertically moving a wheel (2), a brake (9) of the wheel (2) and a mounting table (1) on which an object is placed. The transfer vehicle according to any one of claims 2 to 5, which is characterized in that.