JPH06179145A - Conveying truck - Google Patents

Abstract

PURPOSE:To eliminate a slip which is generated between the driving wheel of a conveying truck and a rail by the torsion of the rail, etc., with the simple mechanism, as for the conveying truck which travels on the rail laid on the floor of a factory, etc., and loads and conveys a workpiece, between a plurality of machine tools. CONSTITUTION:Sprockets 16 and 17 are installed on a driving wheel 13a and a driven wheel 14a, respectively, and a chain 70 is laid between the sprockets 16 and 17, and the power of the driving wheel 13a is transmitted to the driven wheel 14a. With this constitution, all four wheels are synchronously driven to travel a conveying truck.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier truck for carrying a workpiece or the like to a plurality of machine tools such as machining centers.

[0002]

2. Description of the Related Art In an FMS in which a plurality of machine tools such as machining centers are connected to perform unmanned operation machining, a carrier truck is used to convey the work pieces to the machine tools. In addition, as a carrier vehicle, a so-called two-wheel drive system that drives one of the front and rear wheels is adopted, and steel wheels are rotationally driven on rails laid on the floor of a factory or the like. The carrier truck is designed to travel by the frictional force between the rail and the wheels.

[0003]

A carrier truck for carrying a work or the like needs to run at a high speed in order to shorten the time for carrying between machine tools. However, the above 2
In a wheel drive type transport cart, one of the wheels (driving wheel) that is being driven rises due to the deflection of the rail, etc., causing the wheel to slip on the rail and raise the traveling speed beyond a certain limit. There was a problem that I could not do it. In particular, in a carrier truck that has a lift device that can adjust the height of the workpiece on the carrier truck, the center of gravity of the carrier truck becomes high, and tilting occurs when starting and stopping traveling,
Such a problem was easy to occur. To address these problems, measures such as moving the center of gravity to the drive wheel side of the carrier to increase the surface pressure of the drive wheel on the rail, and reducing the area of the drive wheel contacting the rail to increase the surface pressure are available. Attempts were made, but none of them yielded satisfactory results. Therefore, an object of the present invention is to eliminate the above-mentioned slip between the wheels of the carrier and the rails and to realize this with a simple mechanism.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a drive device for driving either one of the front and rear two wheels of four wheels, and the rotational power of the two wheels. It is composed of a transmission device for transmitting to the other two wheels, and travels by synchronously driving four wheels by the transmission device.

[0005]

When the drive device provided on the carrier is driven, the two drive wheels rotate, and the power of the drive wheels is synchronously transmitted to the two driven wheels by the transmission device. As a result, the carrier truck travels on the rail by the four wheels that are synchronously driven.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a certain process line of an FMS production line using the carrier of the present embodiment. 100
Is a carrier truck of the present embodiment, 101 is a processing machine, and 102
Is a loading device that supplies the work W, and 103 is a conveyor that conveys the work W to another process line. 6
Reference numeral 1 is a rail for traveling of the carrier vehicle 100, which is laid on the floor in parallel with each other and serves as a track for traveling of the carrier vehicle 100. The production line configured as described above is used as a carrier truck 100.
However, the workpiece is placed on the workpiece and conveyed between the processing machine 101, the loading device 102, and the conveyor 103.

FIG. 2 is a structural view showing the structure of a carrier vehicle according to an embodiment of the present invention, and FIG. 3 is a sectional view taken along the line AA 'in FIG. The carriage body 10 of the carriage 100 has a travel drive device 1 for running the carriage 100 itself.
1, a speed reducer 12, a lift drive device 21 for moving the lift table 20 up and down, a frame 15 for fixing a lift guide rail (not shown) for guiding the lifting operation of the lift table 20 are fixed. Driving wheels 13a and 13b and driven wheels 14a and 1 which are wheels for traveling
4b is rotatably attached.

A lift table 20 for raising and lowering the workpiece W and the like is mounted on the upper surface of the carriage main body 10 on the frame 15 via a guide rail for lift (not shown) so as to be movable in the Z-axis direction. Here, lift table 2
The zero lift mechanism will be described. This lift mechanism is composed of a rod-shaped link having the same length as the link 24 and the link 25. The links 24 and 25 intersect each other at their centers to form an X shape, and are supported by a pin 29 so as to be swingable with respect to each other. ing. Then, the lift table 20 is moved up and down by increasing or decreasing the angle of intersection of the links 24 and 25.

One end of the link 24 is a pin 2 on the carriage body 10.
4a is swingably supported, and the other end is provided with a pin 24 in an elongated hole 20a provided on the side surface of the lift table 20.
supported by b. On the other hand, one end of the link 25 is swingably supported by the lift table 20 by a pin 25b, and the other end is swingably supported by a link support member 26 by a pin 25a. The link support member 26 is attached to the carriage body 10 so as to be movable in the X-axis direction. The link support members 26 are connected to each other by a connecting rod 27, and the connecting rod 27 has a ball screw 28.
Are screwed together. Then, as the ball screw 28 rotates, the link support member 26 is moved. Further, the ball screw 28 is connected to a lift drive device 21 fixed to the upper surface of the carriage body 10.

With the above structure, when the lift driving device 21 is driven, the ball screw 28 is rotated to move the link support member 26 via the connecting rod 27. Along with this, one end of the link 28 pinned moves in the elongated hole 20a. Then, the crossing angle of the links 24 and 25 is increased or decreased, and as a result, the lift table 20 is moved up and down.

The drive wheels 13a and 13b are connected to each other by a shaft 31 and are adapted to rotate in synchronization with each other. Similarly, the driven wheels 14a and 14b are connected to each other by the shaft 32, and rotate in synchronization with each other. Further, the shaft 31 is
It is connected to the traveling drive device 11 via a speed reducer 12, is rotated by the drive of the traveling drive device 11, and is driven by the drive wheel 1.
3a and 13b are rotated.

A drive sprocket 16 is attached to the drive wheel 13a.
Is fixed, and the drive sprocket 16 is the drive wheel 1
It is designed to rotate with 3a. Similarly, a driven sprocket 17 is fixed to the driven wheel 14a, and the driven sprocket 17 rotates together with the driven wheel 14a. In addition, the sprocket 16,
A chain 70 is hung on the driving wheel 13a.
Is transmitted to the driven wheel 14a so as to rotate in synchronization.

The operation of the present embodiment having the above construction will be described. Now, the lift drive device 21 is driven to move the lift table 20 up and down to a position corresponding to the height of the target processing machine 101 or the like. Next, when the traveling drive device 11 is driven, the shaft 31 is rotated via the speed reducer, and the drive wheels 13a and 13b and the drive sprocket 16 are rotated. Then, the driven sprocket 17 is rotated through the chain 70, and the drive wheels 14a and 14b are rotated. Therefore, as a result, all the wheels 13a, 13b, 14a, 14b are synchronously driven, travel on the carrier 100, and move to a predetermined place. The workpiece W is transported by repeating the above process.

In the carrier vehicle 100 in this embodiment, the drive of the drive wheels 13a is transmitted to the driven wheels 14a via the chain 70, so that the four-wheel synchronous drive can be achieved by a simple mechanism and all the wheels are driven. As a result, the driving wheel that floats due to the deflection of the rail, etc. and comes into contact with the rail is
The effect is that the wheels do not slip and the wheels do not easily slip. Also, the sprocket 1 for power transmission
6 and 17 are provided on the side surface of the wheel, and the chain 70
Excellent maintainability such as tension adjustment. Further, the present invention has an advantage that the mechanism can be easily provided and a high effect can be exerted even in the transport carriage having the lift mechanism for adjusting the height of the workpiece W whose center of gravity is likely to be high as in the present embodiment.

In this embodiment, the chain 70 is used to transmit the power of the driving wheels to the driven wheels, but a transmission belt such as a timing belt may be used.

[0016]

As described above, according to the present invention, the transmission device is provided in the carrier vehicle and the drive of the drive wheels is transmitted to the driven wheels, so that the four-wheel synchronous drive can be performed by a simple mechanism and all the wheels can be driven. By driving, there is an effect that it is difficult to cause wheel slip due to lifting of the driving wheels.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a production line using a carrier truck according to the present embodiment.

FIG. 2 is an overall configuration diagram of a carrier vehicle of the present embodiment.

3 is a cross-sectional view taken along the line A-A 'in FIG.

[Explanation of symbols]

 20 Lift Table 13a, 13b Drive Wheel 14a, 14b Driven Wheel 16 Drive Sprocket 17 Driven Sprocket 70 Chain W Workpiece

[Procedure amendment]

[Submission date] December 22, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (1)

[Claims] 1. A vehicle having four wheels, running on a rail laid on the floor of a factory or the like, between a plurality of machine tools or the like,
In the transport carriage for loading and transporting the work etc., the above 4
Of the two wheels, a drive device for driving one of the front and rear two wheels and a transmission device for transmitting the rotational power of the two wheels to the other two wheels are provided, and the four transmission devices are synchronously driven by the transmission device. A carrier truck that is characterized by traveling as a result.