JPS5936536Y2 - Mobile trolley drive device - Google Patents

Description

[Detailed description of the invention] This invention is based on peripheral equipment for automated warehouses, transportation equipment related to logistics,
This invention relates to drive devices for movable carts used in automobile production lines, general factory production lines, etc.

Figures 1 and 2 show a part of conventional mobile trolley equipment. In the figures, 1 is a drive shaft driven by a drive motor (not shown), and 2 is a drive shaft that is arranged in parallel along the drive shaft 1. a running rail 3, a running wheel attached to the bogie body 4 and capable of running on the running rail 2, and 5 a running wheel 3;
This is a guide wheel that prevents the wheel from shifting left and right on the running rail 2.

A bracket 7 is fixed to the lower end of the vertical shaft 6 pivotally connected to the truck body 4, and a friction drive wheel 8 that can rotate around the horizontal axis 1 is attached to the bracket 7. includes a spring (not shown) that presses the drive wheel 8 against the drive shaft 1 with a required pressure, and an angle θ formed by the horizontal axis 1□ of the drive wheel 8 and the horizontal axis 1□ of the drive shaft 1.
A spring (not shown) is attached to rotate the bracket 7 so as to maintain the angle θ at its normal maximum position (generally 45°), and by rotating the drive shaft 1, the angle θ is
The drive shaft 8, which is tilted at
The movable cart can be moved by rotating it around the periphery.

A speed control cam roller 10 is pivoted to the tip of an arm 9 fixed to the side of the bracket 7 so that its axis is perpendicular, and a cam roller 10 is mounted on the foundation side at a required position in the middle of the line to control the speed of the moving cart to a low speed. A speed control cam plate 11 fixed to is provided.

The drive wheel 8 is held by a spring (not shown) to maintain a large angle θ during high-speed driving, and the drive shaft 1
is more driven.

Thus, the moving cart carries the load on the main body 4 of the cart and travels at a constant speed in the direction of the arrow in FIG. The drive wheel 8 contacts and is pushed by the cam plate 11, and the drive wheel 8 turns counterclockwise around the vertical axis 6, the angle θ gradually decreases, the running speed gradually decreases, and the cam roller 10 is cam plate 1
The angle θ from the oblique side of 1 to the part 11' parallel to the drive shaft 1 is a small constant value (generally about 0.5° to 4°).
At this point, the movable cart is forcibly stopped by a stopper (not shown) provided at an arbitrary position on the rail 2 side.

In this way, even when the movable trolley is stopped, θ remains slightly, causing slippage between the drive wheels 8 and the drive shaft 1, and forward thrust remains even when the movable trolley is stopped.

This means that even if θ is set to Oo, the movable trolley can be stopped, but the stopping position of the movable trolley may become inaccurate, or the cam plate 11 may be moved away from the drive wheel 8 when the movable trolley is restarted. This is because the vehicle will not start unless θ=0°.

By the way, in the conventional system as described above, when the stop pitch (work station pitch) of the movable cart is short, the length of the cam plate 11 becomes a problem, and the length of the cam plate 11 is longer than the stop pitch of the movable cart. If it is long, it will not be possible to arrange each of the cam plays 1-11, and the layout will be restricted.

If the transfer time of the moving cart from one process to the next is a problem, increase the traveling speed of the moving cart or shorten the acceleration/deceleration distance to perform rapid acceleration or sudden deceleration. This is a simple method, but for this purpose it is necessary to increase the thrust of the mobile cart, so a way to solve this problem is to increase the number of drive wheels 8 and use multiple drive wheels to increase the thrust. However, such a system has problems in terms of economics, maintenance, etc., and some other solution has been sought.

In view of the above-mentioned circumstances, the present invention was developed with the aim of easily increasing the thrust without significantly changing the conventional structure. In the movable trolley equipment that allows the trolley to travel along the rail by receiving a driving force in contact with the shaft, processing is performed to increase frictional resistance with the drive wheel at front and rear positions of the trolley stop on the drive shaft. The present invention relates to a drive device for a mobile cart, characterized in that it is provided with a portion subjected to the above-described steps.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 3 and 4 are diagrams of the movable trolley drive device of the present invention, and in these figures, the same parts as in FIGS. 1 and 2 are denoted by the same reference numerals.

On the drive shaft 1, the bogie stop position, that is, the stop part of the drive wheels 8 is designated as A, the front and rear parts of the stop part A are respectively designated as the deceleration part B and the acceleration part C within the required range, and the deceleration part B The surface of the drive shaft 1 is roughened by spraying a friction resistance material 12 such as a knurling or fine metal onto each of the acceleration portions C and the acceleration portion C, thereby increasing the friction resistance with the drive wheels 8 (changing the coefficient of friction). In addition, the stop portion A is a region slightly wider than the width of the drive wheel 8, and is a smooth surface made of the same material (round bar, steel pipe, etc.) as the drive shaft 1.

In the above configuration, when the mobile cart comes to the cam plate 11, the collar roller 10 comes into contact with the oblique side of the cam plate 11 and is pushed by the cam plate 11, and the drive wheel 8 is rotated in a reverse direction about the vertical axis 6. As it turns clockwise, the inclination angle of the drive wheel 8 (as shown in FIG. 1) becomes smaller and the traveling speed is also reduced. As a result, the drive wheels 8 are rapidly decelerated due to their frictional resistance, so that the movable cart is quickly stopped at the position of the drive wheels 8 at the stop portion A.

On the other hand, since the friction resistance material 12 is applied to the acceleration portion C of the drive shaft 1 even when the mobile cart is restarted, the drive wheel 8 receives a strong thrust due to the friction resistance and is suddenly accelerated. .

In this way, acceleration and deceleration of the movable cart can be accurately performed over a shorter distance and in a shorter time.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, it is possible to form unevenness for frictional resistance directly on the drive shaft, and various changes may be made without departing from the gist of the present invention. Of course.

As described above, according to the present invention, frictional resistance parts with the drive wheels are provided at the front and rear of the drive wheel stop position of the drive shaft, so the number of drive wheels can be increased and the pressure of the drive wheels against the drive shaft can be increased. It is possible to rapidly accelerate and decelerate the moving cart without increasing force, and therefore the length of the cam plate can be shortened, the stopping pitch of the cart can be further shortened, and the transfer time to the next process can be shortened. It has excellent effects such as being able to significantly improve work efficiency.

[Brief explanation of the drawing]

1 and 2 are a schematic plan view and a front view of a conventional example, and FIGS. 3 and 4 are a schematic plan view and a side view of the drive device of the present invention. 1... Drive shaft, 2... Rail, 3...
...Traveling wheel, 4...Moving trolley body, 8...Friction drive wheel, 12...Friction resistance material.

Claims (1)

[Scope of utility model registration request] In the movable trolley equipment in which the trolley can travel along the rails by receiving driving force from friction drive wheels provided on the trolley in contact with a rotary drive shaft arranged in parallel with the rails, the trolley stops on the drive shaft. 1. A drive device for a movable trolley, characterized in that a portion processed to increase frictional resistance with the drive wheel is provided at a front and rear position of the portion.