JPH026007Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a soundproof workpiece loading device for loading forged products and the like onto pallets while ensuring soundproofing when dropping and loading them.

[Prior art]

Conventionally, most of the workpieces, such as forged products and cast products, require post-processing such as grinding, so they are chuteed directly onto pallets as shown in Figure 7 to be loaded because they need to be transported to subsequent processes. . This pallet 1 is a box-shaped container with an opening at the top, and is made of steel plates because the workpieces are heavy and are heated to high temperatures because they are directly charged after forging and casting. It is formed into a box shape by the side plates 3.

[Problem that the invention attempts to solve]

However, in the past, the workpieces were loaded by loading them into a chute, which caused the steel plate floor plate 2 to collide with the workpieces, producing collision noise, and the noise level was extremely high, which often caused environmental problems. was. For this reason, conventional countermeasures include providing a soundproof enclosure or reducing the height from which the workpiece falls. However, in the former case, the soundproof enclosure becomes an obstacle to the transportation work of pallet 1, leading to deterioration of work efficiency, and in the latter case, it is difficult to set the height, and even a very small fall height causes a considerably high noise level. Therefore, at present, there is still no workpiece loading device that has a high soundproofing effect without affecting work efficiency.

The present invention focuses on the above-mentioned conventional problems, and aims to provide a workpiece loading device that can obtain a high soundproofing effect without impeding workability.

[Means for solving problems]

In order to achieve the above object, the soundproof type workpiece loading device according to the present invention has a layer of granular material such as sand, and is placed on the layer of granular material and a gap through which the granular material passes is formed. Compressed air is supplied to the powder by means of a pallet having a floor plate, an air pipe opened at a position below the upper surface of the powder layer, and an air diffusion hole communicating with the air pipe and opened toward the powder layer. The present invention is configured to include an aeration means introduced into the granular material layer to fluidize the granular material layer and cause the pallet floor plate to sink into the granular material layer.

[Effect]

With the above configuration, if a workpiece is dropped into the pallet with the pallet floor plate submerged in the powder layer, the workpiece will fall onto the upper surface of the powder layer and will not collide with the pallet floor plate. In this case, only the sound of collision with the powder or granular material is generated, and the noise can be significantly reduced. Moreover, since the pallets themselves are installed with their side walls protruding above the powder layer, there is no problem in transporting the pallets.

〔Example〕

EMBODIMENT OF THE INVENTION Below, the Example of the soundproof type work loading device based on this invention is described in detail with reference to drawings.

1 and 2 show an apparatus according to an embodiment.
As shown in the figure, this device includes a pit-shaped container 10 with an open top, and a diffuser plate 12 is attached at a slightly lower position of the container 10 to partition the interior into upper and lower parts. The air diffuser plate 12 is provided with many fine holes, and the chamber below the air diffuser plate 12 is called the air chamber 1.
4, and the air introduced through the air pipe 16 connected to the air chamber 14 is diffused to the upper part through the fine holes of the air diffuser plate 12. On the other hand, the upper chamber partitioned by the air diffuser plate 12 is filled with sand 18, which is a heat-resistant granular material.
The sand 18 is filled to a certain layer thickness near the opening of the container 10, and can be fluidized by blowing air through the air diffuser plate 12. To prevent the sand 18 from falling into the air chamber 14,
The diameter of the micropores in the air diffuser plate 12 is made smaller than the particle diameter of the sand 18.

A pallet 20 on which works are loaded is placed on top of the sand 18 which is made to be fluidized. The floor plate 22 of this pallet 20 is formed of a plurality of round bars 22A, and the round bars 22A are arranged side by side at intervals that prevent the workpieces from falling. A gap 24 sufficient to allow sand 18 to flow is formed between the round bars 22A. Further, the side wall 26 of the pallet 20 is formed of a normal steel plate, and a forklift claw receiving portion 28 is provided at the upper position of the outer surface. The pallet 20 is placed on the sand 18 as shown in FIG.
2 to the sand 18, the sand 18 is fluidized, and as shown in FIG. layer. Note that 30 in the figure is a valve installed in the air pipe 16.

The operation of the soundproof workpiece loading device having such a configuration is as follows. The pallet 20 is placed on the container 10 filled with sand, and the piping 16 is connected as described above.
By flowing air through and fluidizing the sand 18, the pallet 20 sinks into the sand 18 by its own weight. The depth to which the pallet 20 is sunk depends on the weight of the falling workpiece, but when the required depth is reached, the air is stopped and the pallet 20 is submerged with sand.
Fix it in 8. In this state, the workpieces are dropped from above the pallet 20 and loaded. After the loading of the workpieces is completed, the sand 18 is fluidized again, or the forklift claw is inserted into the claw receiver 28 in this state, and the pallet 2 is
Raise 0. At this time, since a gap 24 is provided in the floor plate 22 of the pallet 20, the sand in the pallet 20 can easily pass through, the pallet 20 can be easily pulled out, and the pallet 20 can be immediately transported to the subsequent process. .

FIG. 3 shows the experimental results of the soundproofing effect of such a loading device. This is a measurement of the noise level when the height of the filling amount of sand 18 from the pallet floor plate 22 is changed. The workpiece was a forged car rear axle shaft, and the workpiece was dropped from a height of 75 cm above the floor plate 22 and measured. As is clear from this result, by filling the pallet 20 with sand 18 of 2 cm or more, a reduction effect of 10 dB or more can be obtained.
A filling amount of 10 cm or more has a reduction effect of more than 40%.

According to such an embodiment, within the pallet 20 there is a layer of sand 1
8 is spread over the pallets 18, and the workpieces are dropped onto the sand 18 and loaded, so the soundproofing effect is high, and the sand 18 easily falls off the floor plate 22, so it does not interfere with the transportation work of the pallets 20. I won't give anything. In addition, the sand 18 is heat resistant and will not damage the pallet 20 even with high-temperature workpieces, and will not directly collide with the pallet 20, which has the advantage of preventing collision damage.

Figures 4 to 6 show another embodiment, in particular a modification of the means for fluidizing the sand 18. That is, the diffuser plate 12 and the air chamber 14 are stopped,
A branch pipe 32 connected to the air pipe 16 is embedded in the sand 18 filled in the container 10. Branch pipe 32
A large number of nozzles 34 are provided, and the nozzles 34 are formed by processing a small hole plate into a cylindrical shape. In this embodiment, since the nozzle 34 is installed directly in the sand 18, there is an advantage that the structure can be simplified such as reinforcement of the diffuser plate 12 and sealing between the diffuser plate 12 and the container 10 are not required. be.

In addition, in the above embodiment, the floor plate 2 of the pallet 20
2 is formed of a round bar 22A, but it is not limited to a round bar, and may be formed of a bar with a triangular or rhombic cross section, or may be configured as a lattice plate. In addition to the sand 18, small steel balls or differential bodies can be used as the powder or granular material, and if the workpiece is not a high-temperature product, heat resistance is not particularly required, so it may be made of a resin material or the like.

[Effect of idea]

As explained above, according to the present invention, the pallet floor plate is lowered into the powder layer and the workpieces are dropped onto the powder layer, thereby significantly reducing the collision noise of the workpieces and It is possible to obtain a soundproof workpiece loading device having a structure that does not cause any hindrance to pallet transportation work.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing the soundproof work loading device according to the embodiment. Figure 1 is a cross-sectional view before the pallet sinks, Figure 2 is a cross-sectional view after the pallet sinks, and Figure 3 is a sand filling device. Graph of the relationship between volume and noise level, FIG. 4 is a plan view of a container used in another example, FIG. 5 is a sectional view taken along the - line in FIG. 4, FIG. is a sectional view of a conventional pallet. 10... Container, 12... Air diffuser plate, 14... Air chamber, 16... Air piping, 18... Sand, 20... Pallet, 22... Pallet floor plate, 24... Gap.

Claims (1)

[Claims for Utility Model Registration] (1) A pallet having a layer of granular material such as sand, a floor plate placed on the layer of granular material and having a gap through which the granular material passes; Compressed air is introduced into the powder layer through an air pipe opened at a position below the upper surface of the powder layer and an air diffusion hole that communicates with the air pipe and opens toward the powder layer. A soundproof work loading device comprising an aeration means for fluidizing the powder layer and sinking the floor plate into the powder layer. (2) The aeration means is disposed on the bottom surface of the powder layer, supports the powder layer by forming a chamber in the lower part thereof, and has a particle size larger than the particle size of the powder layer on the supporting surface. A utility model registration claim comprising: an air diffuser plate in which a plurality of fine holes having a small diameter are formed; and an air pipe that opens in a chamber under the powder layer and introduces compressed air. A soundproof workpiece loading device according to scope 1. (3) The aeration means includes a branch pipe having a plurality of nozzles and buried in the powder layer, and an air pipe connected to the branch pipe and introducing compressed air into the branch pipe. A soundproof workpiece loading device according to claim 1 of the utility model registration claim.