JPS6234655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pallet conveying device that absorbs shocks when pallets stop or when pallets collide with each other during pallet conveyance using a free flow conveyor.

Conventional free-flow conveyor pallets have rubber or rubber on the contact surface at the front or rear of the pallet.
It is common to use a shock absorbing material such as a spring, and to absorb even larger shocks, a complex shock absorber is installed on the conveyor body. The former has a limitation in its ability to absorb shock when the pallets are stopped, and the latter has the disadvantage that it is unable to absorb shock when one pallet collides with another, making it impossible to transport pallets at high speed.
Furthermore, the latter method is complicated and requires a large space, and also has the drawbacks of being expensive.

The present invention solves the above-mentioned conventional drawbacks,
Examples thereof will be explained below based on FIGS. 1 to 6.

In Figs. 1 to 5, reference numeral 1 indicates a shock absorber 2 at the bottom in the forward direction of the pallet, and a pallet stopper 3 at the rear bottom.
4 is a stopper device for stopping the pallet. Reference numeral 5 represents a shock absorber main body, which includes a pallet stopper 3 and a stopper device 4.
At the moment when the piston 7 is connected to its tip with a buffer plate 6 made of noise prevention material or damage prevention material that acts as a buffer, the piston 7 is pushed forward and the buffer air is pumped through the flow rate with a check valve. A compression spring 11 is built in for absorbing air into the rear cylinder chamber 10 through the control valve 8 and the air supply/exhaust port 9. Furthermore, in order to ensure smooth movement, sealing material with high frictional resistance is not used in the sliding part with the piston 7, and the structure has a sealing effect by matching the dimensions of the cylinder interior diameter and the piston outside diameter. This is the main body of the shock absorber.

Reference numeral 12 denotes an air hole for supplying and exhausting air from the front cylinder chamber 14.

In the above configuration, when the pallet 1 moving forward on the free flow conveyor hits the stopper device 4 as shown in FIG. 2 or the front pallet 1 as shown in FIG. 3 and stops, the conveying force of the pallet 1 by the conveyor is The piston 7 is pushed by the inertial force of the pallet and its loaded objects, compressing the compression spring 11 and compressing the air in the rear cylinder chamber 10 through the air supply/exhaust port 9 to the flow control valve 8 with a check valve. The amount of air discharged is controlled to provide a buffering effect. The buffering effect can be changed by adjusting the flow rate of the flow rate control valve 8 with a check valve according to the weight of the pallet 1 and the loaded items and the conveyor speed. Next, when the stopper device 4 is released or the front pallet is removed, the piston 7 returns due to the repulsive force of the compression spring 11. At this time, air freely flows into the rear cylinder chamber 10 from the supply/exhaust port 9 through the check valve of the flow control valve 8 with a check valve, so that the return operation is quick. Note that air in the front cylinder chamber 14 enters and exits through the air hole 12 at any time.

Therefore, the mild impact during conveyance of the pallet 1 by the free flow conveyor is caused by the stopper device 4.
This occurs when the stopped pallet 1 is stopped, and when another pallet is conveyed and collides with the stopped pallet 1. According to the present invention, both mild impacts can be absorbed. In other words, the pallet stopper 3 attached to the rear of the pallet 1 and the stopper device 4 provided on the conveyance path of the free flow conveyor are prevented from interfering with each other due to the difference in height on the conveyance path, as shown in FIGS. 4 and 5. ing. The pallet stopper 3 is brought into contact with the upper part of the piston 7 of the shock absorber 2 from the center, and the stopper device 4 is brought into contact with the lower part of the piston 7 from the center, so that the pallet stopper 3 does not interfere with the stopper device 4,
It is designed to be able to pass on the transport path of the free flow conveyor. Therefore, when the stopper device 4 stops the pallet 1, the piston 7 of the shock absorber 2
Since it comes into contact with only the pallet 1, it is possible to always smoothly stop the pallet 1 in front of the pallet 1 without having to operate the stopper device 4 in a complicated manner.

FIG. 6 shows another embodiment of the present invention, in which the shock absorber 13
Pistons 7a and 7b are provided in the front and rear, and the rear piston 7b is used for buffering against the stopper device 4 when the pallet 1 is returned, and the advantage is that one shock absorber 13 can measure the buffering when the pallet 1 is stopped both moving forward and backward. There is.

Although the shock absorbers 2 and 13 and the check valve-equipped flow control valve 8 are configured separately in the above embodiment, they may be incorporated in the shock absorber.

Further, although the pallet stopper 3 is attached to the pallet 1 as a separate element, it may be formed integrally with the pallet 1. The point is to provide a buffer device using fluid compression and a pallet stopper to the pallets being conveyed using the free flow conveyor as a conveyance route, so that when the pallet collides with the stopper device placed on the conveyance route or another pallet, the shock absorber protects the pallet in any case. It is sufficient if it is made to work.

As described above, according to the present invention, it is possible to reliably absorb the shock caused by the stopper device during pallet conveyance of the free flow conveyor and the rear-end collision between pallets, thereby increasing the pallet conveyance speed by 2 to 3 times compared to the conventional method. This makes it possible to improve the efficiency of conveyor work. Moreover, because of its simple structure, it is economically inexpensive and is effective in conveying pallets at high speed on a free flow conveyor.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a pallet in an embodiment of the present invention, Fig. 2 is a side view of the stopper device and the pallet, Fig. 3 is a side view of the relationship between the pallets,
FIG. 4 is a side sectional view of the stopper device and the pallet at the time of collision, FIG. 5 is a side sectional view of the same pallet at its forward limit, and FIG. 6 is a side sectional view of the pallet in another embodiment. 1...Pallet body, 2...Buffer device, 7...
Piston, 8...flow control valve, 9...supply/exhaust port,
12...Air hole.

Claims (1)

[Claims] 1 Equipped with a conveyance pallet conveyed on a free flow conveyor and a stopper device for stopping the conveyance pallet, a stopper device is provided at the front of the conveyance pallet in the same direction as the conveyance direction. A damping device is arranged, consisting of a removably supported piston and a cylinder chamber containing a fluid that can be compressed by the sliding movement of the piston, and a pallet stopper is arranged at the rear of the conveying pallet. The position is such that the stopper device is in contact with the upper part of the tip of the piston of the shock absorber disposed at the front of the subsequent pallet for conveyance, and the stopper device is independent of the pallet for conveyance and is in contact with the lower part of the tip of the piston. A free-flow conveyor type pallet conveying device which is movably arranged in a position where the stopper device and the pallet stopper are in contact with each other, and the stopper device and the pallet stopper are in a positional relationship in which they do not come into contact with each other.