JPS6265822A - Carriage type conveyer device - Google Patents

Abstract

PURPOSE:To make possible to stably support a load support bed at a predetermined level, by setting the load support bed on a carriage so that the load support bed is elevated by means of a lift-up rail laid on a specific path including a carriage stopping position, and is then held by a stationary receiving bed. CONSTITUTION:When a self-travel type carriage 1 in which a workpiece is set on a load support bed 9 on a cargo bed 3 runs along a guide rail 2 and enters into a specific path section including a stopping position A, a flat roller 11 and a grooved roller 12 which belong to the load support bed 9 ride on a support bed lift up rail 16. Therefore, the load support bed 9 is floated up to a predetermined height from the cargo bed 3 while it is guided by an elevating guide pin 14. Further, when the carriage 1 comes to the stopping position A, a vertical shaft roller 15 is clamped by clamping pieces 21a, 21b which are closed by a cylinder 24 to be positioned, and when a cylinder is then actuated, the load support bed 9 is lowered by means of a cam 28 or the like, together with elevating rail sections 17a, 18a, and is shifted onto a stationary receiving bed 31.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is applicable to a trolley-type transport device utilized in, for example, an automobile assembly factory, that is, a transport system in which a workpiece is transported by a transport vehicle that runs along a guide rail. It is related to the device.

(Prior art and its problems) The above-mentioned trolley-type transport device is used as a means of transporting large and heavy workpieces such as the body of a car, but the transporter is stopped at a fixed position. When the work of attaching parts to the upper workpiece is automated by an industrial robot installed beside the moving path of the transport vehicle, a high degree of precision is required regarding the positioning device and posture of the workpiece when the transport vehicle stops. For this reason, it is necessary to increase the accuracy of the mounting position of the workpiece on the transport vehicle and the stop position of the transport vehicle, but no matter how high these precisions may be, deformation of the transport vehicle itself, wear of the wheels and axle supports, or damage to the guide rails may occur. It is inevitable that the accuracy of the stopping position and posture of the workpiece will decrease due to deformation of the wheel and wear of the wheel transfer surface. Furthermore, if the workpiece is heavy, the strength of the transport vehicle or guide rail must be significantly increased compared to when these are used simply as transport means, to eliminate even the slightest possibility of deformation. This also causes a significant increase in costs.

(Means for Solving the Problems) The present invention proposes a trolley-type transport device that can solve the above-mentioned conventional problems. A load support platform is mounted on the top of the transfer platform so that the load support platform can be raised and lowered, and a load support platform lifting rail is provided at a specific route portion including the stop position of the transfer platform vehicle during the moving route of the transfer platform vehicle, for lifting the load support platform from the transfer platform vehicle. A carriage positioning means for positioning the carriage is provided at the carriage stop position, and the load support platform lifting rail is configured to be movable up and down at the carriage stop position. The present invention is characterized in that a fixed receiving table is disposed to receive the load supporting table which is lowered as it is lowered while floating above the conveying cart.

(Function) According to the above-described configuration of the present invention, in a simple workpiece conveyance path, the load support is placed on the conveyor, and the weight of the workpiece mounted on the load support is transferred via the load support. It is caught in a trolley. On a specific path including the transport vehicle stop position, the load support platform carrying the workpiece is lifted from the transport vehicle by the load support platform lifting rail, and slides on the rails receiving only the load from the transport vehicle. When the carrier vehicle stops at a predetermined position, the carrier vehicle is fixed at the predetermined position by the carrier positioning means. By lowering the rail portion, the load support can be placed on the fixed pedestal while still floating relative to the carrier.

As a result, the position of the load support with respect to the traveling direction of the carrier is determined by the stop position of the carrier by the carrier positioning means, and the height and horizontality of the load support are independent of the carrier and are determined by the height of the fixed pedestal. and levelness.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a self-propelled transport vehicle that runs supported by a pair of left and right guide rails 2, including a loading platform 3 and a pair of left and right drive wheels 4 that fit on the guide rails 2. and a pair of left and right idling wheels 5, a vertical shaft roller 6 for steady rest abutting the inner edge of the guide rail 2, and a drive motor 8 interlockingly connected to the drive wheel 4 via a speed reducer 7, as shown in the figure. Although omitted, the motor 8 is automatically controlled by the power and control signal supplied from the power supply rail installed along the guide rail 2 via the current collection unit included in the self-propelled carrier 1. According to
The Is carriage 1 can be made to travel by itself along a guide rail 2, and can be automatically stopped and started at a predetermined position.

Reference numeral 9 denotes a load support platform placed on the loading platform 3 of the transport vehicle 1, and is provided with lifting guide holes 10 at four locations corresponding to the upper four corners of the loading platform 3, and a flat roller on one of the left and right sides. 11 and a grooved roller 12 on the other hand are supported by horizontal support shafts at positions near both front and rear ends, respectively. Further, positioning pin holes 13 are provided at the lower four corners of the load support stand 9. Elevating guide pins 14 are provided on the loading platform 3 side of the transport vehicle 1 in a protruding manner, and are fitted into the elevating guide holes 10 to position the load support platform 9 so as to be able to be moved up and down and removed. 15 is a vertical shaft roller for positioning that is pivotally supported on one side of the transport vehicle 1.

As shown in FIGS. 4 to 6, a specific route portion including the transportation vehicle stop position A on the moving route of the transportation vehicle 1 includes:
A load support platform lifting rail 16 for lifting the load support platform 9 from the transport vehicle 1 is installed. The load support platform lifting rail 16 includes a pair of rails 17 on which the flat rollers 11 are transferred and positioning rails 18 on which the grooved rollers 12 fit and roll. A carriage positioning means 19 for positioning the carriage 1 is provided at the carriage stop position A, and a carriage positioning means 19 for positioning the carriage 1 is provided at the carriage stop position A. The parts are configured to be able to be raised and lowered, and the raising and lowering rail parts 17a and 18a thereof have a raising and lowering driving means 20a.

20b is provided.

The trolley positioning means 19 includes a pair of clamping pieces 21a and 21b that can be opened and closed, sandwiching the positioning vertical axis roller 15 provided on the transport carriage 1 from the front and back, both clamping pieces 21a,
A pair of gears 22a, 22b and one clamping piece 21a are interlocked to rotate the gears 21b in opposite directions.
The arm 23 and the gears 22a, 22b connected to the
It is composed of a cylinder unit 24 that opens and closes a pair of clamping pieces 21a and 21b via the cylinder unit 24. Further, the lifting rail portions 17a, 1 of the load support platform lifting rail 16
Lifting drive means 20a for 8a.

Reference numeral 20b denotes a plurality of front and rear lifting rods 25 that support each lifting rail portion 17a, 18a so as to be able to rise and fall; Table 26, this back and forth moving table 26
It is composed of an elevating drive cam 28 which supports each elevating rod 25 via a cam driven roller 27 pivotally supported at the lower end thereof, and a cylinder unit 29 which moves the back and forth moving table 26 back and forth. Reference numeral 30 denotes a connecting rod that connects the front and rear movable tables 26 located at the front and rear.

Reference numeral 31 denotes a pair of left and right fixed receivers that receive the load support platform 9, which descends as the lifting rail portions 17a and 18a descend, while still floating relative to the transport vehicle 1. A positioning pin 32 is protruded from the fixed pedestal 31 and closely fits into the positioning pin hole 13 provided in the load support 9 to position the load support 9 with high precision. ing.

The self-propelled conveyance vehicle 1 configured as described above carries out a predetermined conveyance work by placing a workpiece on the load support platform 9 positioned on the loading platform 3 and traveling along the guide rail 2. However, when this transport vehicle 1 enters a specific path portion including the transport vehicle stop position A shown in FIGS. The flat rollers 11 and grooved rollers 12 of the platform 9 ride on the platform 9, and the load support platform 9 floats a certain height above the platform 3 of the transport vehicle 1 while being guided by the lifting guide pins 14, as shown in FIG. Furthermore, rail 1
As shown in FIG. 4, the starting end of 7.18 is inclined at an appropriate slope of about 1 so that the load support platform 9 can be lifted smoothly.

The load support platform 9 lifted from the carrier vehicle 1 by the load support platform lifting rail 16 is backed by the lifting guide pin 14 as the carrier vehicle 1 travels, and slides on the rails 17.18 at the same speed as the carrier vehicle 1. . When the transport vehicle 1 reaches the stop position WA and is stopped, the load support platform 9 moves to the lifting rail portion 17 of the load support platform lifting rail 16.
a, 18a, and is located directly above the fixed pedestal 31. In this state, the cylinder unit 24 of the truck positioning means 19 is operated, and the pair of clamping pieces 21a, 21
b is moved closed to sandwich the vertical shaft rollers 15 on the transport vehicle 1 side from the front and back, thereby correcting and fixing the stopping position of the transport vehicle 1. As a result, the position of the load support stand 9 is also corrected in the front-rear direction, and a fixed support stand 31 is placed directly below the positioning pin hole 13.
The tip of the pin 32 on the side will be located.

Next, by operating the cylinder units 29 of the lifting drive means 20a and 20b, moving the front and rear moving table 26, and lowering the lifting rod 25 supported by each lifting drive cam 28 via a cam driven roller 27. , when the elevating rail portions 17a, 18a of the rails 17.18 are lowered in parallel by a predetermined amount, the elevating rail portions t7a, 18a
The load support table 9 supported by the load support table 9 is lowered, and the load support table 9 is transferred onto the fixed receiving table 31 as shown in FIG.

At this time, the pin 32 of the fixed pedestal 31 fits into the positioning pin hole 13 on the side of the load support 9, thereby correcting the position of the load support 9 with even higher precision. Of course, the load support platform 9 is still in a floating state with respect to the transport vehicle 1.

As a result, the load support platform 9 is supported horizontally at a predetermined height by the fixed pedestal 31 regardless of the height of the upper surface of the load platform 3 of the transportation vehicle 1 or the difference in levelness. The horizontal stop position shift due to the play between the lifting guide hole 10 on the load support stand 9 side is caused by
This is corrected by fitting the positioning pin 32 on the side and the positioning pin hole 13 on the load support stand 9 side. Therefore, as long as the mounting position of the workpiece on the load support stand 9 is accurate, the workpiece on the load support stand 9 can be made to correspond accurately to, for example, an industrial robot installed beside the transport vehicle stop position A. The desired work can be carried out safely and accurately.

When starting the transport vehicle 1 again, the lifting drive means 20
By moving the longitudinal moving bodies 26 of a and 20b in the opposite direction, the lifting rail portions 17a and 18 of the load support platform lifting rail 16 are moved.
a to the original height, and fix the load support platform 9 to the fixed cradle 3.
Float from 1.

A pair of clamping pieces 21a, 2 of the carriage positioning means 19
After opening Tb and releasing the positioning fixation of the transport vehicle 1, the transport vehicle 1 may be started. As a result, the load support platform 9 is again pushed up and down by the lifting guide bin 14 on the transport vehicle 1 side. It slides on the lifting rail 16. When the load support platform 9 moves out of the specific route section where the load support platform lifting rail 16 is provided, the load support platform 9 descends and transfers onto the transport vehicle 1.

(Effects of the Invention) According to the trolley-type transport device of the present invention that can be implemented as described above, as long as the fixed cradle is installed accurately, deformation of the transport vehicle itself, wear of wheels and axle supports, or It is completely unaffected by deformation of the guide rail, wear of the wheel transfer surface, etc., and the load support platform on the carrier can be stably supported in a horizontal state at a predetermined height. Therefore, compared to the case where the workpiece is directly mounted on the transport vehicle, the configuration of the transport vehicle and guide rails is easier, and even if the workpiece is heavy, the transport vehicle and guide rails will not have any trouble on the transport surface. Since it is only necessary to provide the minimum required strength, the overall process can be carried out at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal front view showing a transport vehicle and a load support platform;
Fig. 2 is a partially cutaway side view of the same part, Fig. 3 is a plan view of the same part, Fig. 4 is a partially vertical side view illustrating the configuration of the specific route portion including the transport vehicle stop position, and Fig. 5 is a partially cutaway side view of the same part. FIG. 6 is a cutaway plan view, FIG. 6 is a longitudinal sectional front view showing the load support platform in a lifted state, and FIG. 7 is a longitudinal sectional front view showing the load support platform in a state supported by a fixed cradle. 1...Self-propelled carrier, 2...Guide rail, 3...
・Cargo platform, 4... Drive wheels, 5... Idle wheels, 6...
・Vertical shaft roller for steady rest, 8... Drive motor, 9... Load support platform, 10... Lifting guide hole, 11.
... Flat roller, 12 ... Grooved roller, 1
3... Pin hole for positioning, 14... Lifting guide bin, 15... Vertical axis roller for positioning, 16... Rail for lifting the load support platform, 17a, 18a... Lifting rail portion, 19 ... Cart positioning means, 20a, 2
0b... Lifting/lowering drive means for the one part, 21a, 2
1b...Pair of clamping pieces, 24.29...Cylinder unit, 25...Elevating and lowering rond, 26...Back and forth moving table, 28...Elevating and lowering drive cam, 31...Fixed cradle, 32...Positioning pin.

Claims (2)

[Claims] (1) A load support platform is mounted on a conveyance vehicle that travels along guide rails so as to be able to rise and fall freely, and the load support platform is mounted on a specific route portion including a stop position of the conveyance vehicle during the moving route of the conveyance vehicle. A load support platform lifting rail that floats up from the transfer vehicle is installed, a platform positioning means for positioning the transfer platform is provided at the transfer vehicle stop position, and the load support platform lift rail is raised and lowered at the transfer vehicle stop position. A trolley-type conveyance device is provided with a fixed receiver that receives the load support platform, which descends as the lifting rail portion descends, while floating above the conveyance truck. (2) The trolley type conveyance according to item (1), wherein the fixed pedestal and the load support are provided with a positioning mechanism that fits into each other when the load support is placed on the fixed pedestal. Device.