JPH09124146A - Pallet stopping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorbing type pallet stopping device by which damage in an air damper is reduced and no additional high pressure air source is required. SOLUTION: A pallet stopping device is provided with an air damper 2 which is engaged with a pallet 1 on a conveying passage so as to stop it while absorbing a shock, an elevating cylinder 4 which moves the air damper 2 between a stopping position in which the damper 2 can be engaged with the pallet 1 and a retraction position in which engagement between the air damper 2 and the pallet 1 is released, and an air motor 5 which is driven according to a movement of the pallet 1 arranged on the downstream side in the pallet conveying direction beyond the air damper 2 so as to supply returning air to the air damper 2, and after the pallet 1 passes the air damper 2, the air damper 2 is returned by means of the air motor 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet stop device for stopping a pallet conveyed by a free-flow type conveyor at a predetermined position, and more particularly, a pallet stop provided with an air damper for stopping while absorbing a shock. It relates to the device.

[0002]

2. Description of the Related Art In recent years, conveyors have been required to convey objects of various sizes at high speed, and in particular, free-flow type conveyors that place objects to be conveyed on pallets and convey them at high speed. There is a demand for a stop device excellent in shock absorption in order to stop a conveyed pallet at a predetermined position while absorbing a shock.

A conventional shock absorbing pallet stopping device will be described below with reference to FIG.

In FIG. 2, 11 is a pallet, and 12 is an air damper that stops the pallet 11 when the projection 11a provided on the pallet 11 collides and absorbs the impact at the time of the collision. A speed controller 13 controls the speed of the air damper 12 by adjusting the passage amount of the air discharged from the air damper 12. An elevating cylinder 14 moves the air damper 12 up and down to switch between a stop position where the air damper 12 is engaged and stopped with the pallet 11 and a retracted position where the engagement is released.
A mechanical valve 15 supplies high-pressure air to the air damper 12 from the high-pressure air source 16 via the mechanical valve 15 and the check valve 17 when the lifting cylinder 14 descends to bring the air damper 12 to a state before shock absorption. Restore.

Next, the operation of the shock absorbing type pallet stopping device constructed as described above will be described.

First, the lift cylinder 14 raises the air damper 12 to move it to a stop position where the pallet 11 is stopped. When the pallet 11 moves in that state, the protrusions 11a of the pallet 11 move as shown by phantom lines.
When the piston collides with the rod tip and pushes the piston toward the state shown by the solid line, the shock is absorbed by the flow resistance of the exhaust air.

To release the stop of the pallet 11, the air damper 12 is lowered by the lifting cylinder 14. Then, the engagement with the protrusion 11a is released, the pallet 11 is started, and is conveyed on the conveying path toward the downstream side. At the same time, the mechanical valve 15 operates at the lowered position of the air damper 11 to switch to the high pressure air supply side,
High pressure air source 16 to mechanical valve 15 and check valve 1
High pressure air is supplied to the air damper 11 via 7 to return the air damper 12 to the state before the shock absorption, and when the pallet 11 is stopped thereafter, the air damper 12 is raised by the lift cylinder 14.

[0008]

However, the above-mentioned configuration requires the high-pressure air source 16 separately, and has a problem that it can be installed only in a large-scale facility. In addition, the air damper 1 that was restored during manual adjustment
There is a problem that the rod 2 may accidentally collide with the projection 11a of the pallet 11 which is stopped at the upper position thereof and the air damper 12 may be damaged.

In view of the above conventional problems, it is an object of the present invention to provide a shock absorbing type pallet stopping device which does not require a high pressure air source separately and can reduce damage to the air damper.

[0010]

SUMMARY OF THE INVENTION A pallet stop device of the present invention comprises an air damper that engages with a pallet on a conveyance path to stop while absorbing impact, and a stop position at which the air damper can be engaged with the pallet. In a pallet stop device provided with an actuator that moves between a retracted position for releasing engagement, an air motor driven by the movement of the pallet supplies return air to an air damper, and a high pressure air source is used. I did not need it separately.

Further, an air motor driven by the movement of the pallet is arranged at a position downstream of the air damper in the pallet conveying direction so that the air motor supplies the return air to the air damper so that the pallet passes through the air damper. After that, the air damper is returned by the air motor to prevent the returned air damper from colliding with the pallet and prevent the damage.

Further, when the pallet moves to a position downstream of the air damper in the pallet conveying direction, the air motor is driven to supply return air to the air damper.
The returned air damper and the pallet were prevented from colliding with each other to prevent their damage.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a pallet stopping device of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 is a pallet that is conveyed along its conveying path on a free-flow type conveyor. An air damper 2 includes an air cylinder device that stops the pallet 1 when the projections 1a provided on the pallet 1 collide and absorbs the impact at the time of the collision. A speed controller 3 controls the speed of the air damper 2 by adjusting the passage amount of the air discharged from the air damper 2. Reference numeral 4 denotes an elevating cylinder as an actuator, which has a stop position (up position) for moving the air damper 2 up and down to engage with the projection 1a of the pallet 1 to stop, and a retracted position (down position) for releasing the engagement. Switch positions between. 5 is an air damper 2
The air motor is arranged at a position downstream of the pallet conveying direction, and is driven by the movement of the pallet 1 passing over the air motor. Then, the air motor 5 supplies high-pressure air to the air damper 2 via the check valve 6 to return the air damper 2 to the state before the shock absorption.

Next, the operation of the shock absorbing pallet stopping device constructed as described above will be described.

First, the air cylinder 2 is lifted by the lifting cylinder 4.
Is raised and the air damper 2 is positioned at a stop position where the pallet 1 is stopped. As the pallet 1 moves, its projection 1a collides with the rod tip of the air damper 2 as shown by an imaginary line, and the air is discharged by pushing the piston, and the pallet 1 is absorbed while the impact is absorbed by the flow resistance of the air. Be stopped.

When releasing the stop of the pallet 1, the air damper 2 is lowered to the retracted position by the lifting cylinder 4. Then, the engagement between the air damper 2 and the protrusion 1a of the pallet 1 is released, and the pallet 1 is started. Then, after the protrusion 1a of the pallet 1 safely passes over the air damper 2, the air motor 5 is activated along with the movement of the pallet 1, high pressure air is supplied to the air damper 2 through the check valve 6, and The damper 2 returns to the state before the shock absorption.

Although the air motor 5 is driven by the movement of the pallet 1 in the above embodiment, a means for detecting the movement of the pallet 1 when the pallet 1 moves downstream of the air damper 2 is provided. You may comprise so that an air motor may be driven by a detection signal.

[0019]

According to the pallet stopping apparatus of the present invention, as is clear from the above description, the air motor driven by the movement of the pallet is used to supply the return air to the air damper. It does not require an additional air source and can be installed in equipment that does not have a high-pressure air source.

Further, the air motor is arranged at a position downstream of the air damper in the pallet conveying direction, and the return air is supplied to the air damper by the air motor driven by the movement of the pallet. The air damper is restored by the air motor after passing through the air damper, and no matter what operation is performed during manual adjustment, the restored air damper will not collide with the stopped pallet and be damaged. The same effect can be obtained by driving the air motor and supplying the return air to the air damper when the pallet moves to the downstream position in the pallet transport direction from the air damper. To do.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a pallet stop device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional pallet stopping device.

[Explanation of symbols]

 1 Pallet 2 Air damper 4 Lifting cylinder (actuator) 5 Air motor

Claims (3)

[Claims] 1. An air damper that engages with a pallet on a transport path to stop while absorbing an impact, and an air damper that moves between a stop position where the pallet can be engaged with the pallet and a retracted position where the air damper is released. A pallet stop device including an actuator for causing a pallet stop device to supply return air to an air damper by an air motor driven by movement of a pallet. 2. An air damper that engages with a pallet on a conveyance path to stop while absorbing an impact, and an air damper that moves between a stop position where the pallet can be engaged with the pallet and a retracted position where the air damper is released. And an air motor for supplying return air to the air damper. The air motor is arranged at a position downstream of the air damper in the pallet conveying direction and is driven by movement of the pallet. Pallet stop device. 3. An air damper that engages with a pallet on a conveyance path to stop while absorbing an impact, and an air damper that moves between a stop position where the pallet can be engaged with the pallet and a retracted position where the air damper is released. A pallet stop device characterized by comprising an actuator for causing the air damper and an air motor for supplying return air to the air damper, and configured to drive the air motor when the pallet moves to a position downstream of the air damper in the pallet conveying direction. .