JPH05319540A - Transfer screw - Google Patents

Abstract

PURPOSE:To prevent the occurrence of nicking between a coil section and a shaft to improve durability, and ensure the high accuracy of transfer by providing a buffer layer between the shaft and the coil section. CONSTITUTION:This transfer screw is constituted of a metallic shaft 2 having a long size and flexibility, a metallic coil section 3 spirally wound around the shaft 2 at the predetermined pitch, and a buffer layer 4 covering the surface of the shaft 2 and closely laid between the shaft 2 and the coil section 3. The shaft 2 comprises a stranded wire rope or the like of a plurality of stranded wires, so that torque applied to one end of the shaft 2 can be sufficiently transmitted to the other end, and should preferably be impregnated with a lubricant for reducing friction between the wires. Also, the buffer layer 4 comprises an elastic material such as elastomer and soft plastic. According to this construction, the coil section 3 can be properly wound and held on the shaft 2. Also, the coil section 3, even if subjected to a load, does not expand or contract in the lengthwise direction of the shaft 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a conveying screw.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, as a conveying screw a, there is one in which a metallic spiral coil c is externally fitted to a metallic shaft b. For example, the screw a is a pipe. It is rotatably installed in the guide tube d, and by rotating the screw a, the work e such as powder or granular material supplied from one end of the guide tube d is conveyed to the other end of the guide tube d and discharged. It was used in a carrier.

[0003]

However, in the conventional conveying device using the screw a, there is a problem that the conveyance accuracy of the work e is greatly varied due to the expansion and contraction of the coil c itself in the longitudinal direction, and the coil c and the shaft b. There was also a problem with durability because of nicking with.

Further, since there is a gap f between the coil c and the shaft b as shown in the figure, at the portion where the screw a and the guide pipe d are laid vertically, the powder particles fall out from the gap f of the screw a. Work e (powder granules)
Transport accuracy was poor.

Therefore, an object of the present invention is to provide a conveying screw that solves the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a metal screw having a conveying screw, a metal shaft having flexibility, and a metal coil spirally wound around the shaft. And a buffer layer made of an elastic material, which covers the surface of the shaft and is tightly interposed between the shaft and the coil part.

[0007]

With the above construction, the nicking of the coil portion and the shaft can be prevented and the durability is improved. In addition, it is possible to prevent the coil portion from expanding and contracting in the longitudinal direction, and to prevent the granular material from falling out (conventionally occurring) during the transportation of the granular material, which enables highly accurate transportation.

Various types of works such as bottles, bottles, cans and the like other than the powder and granules can be carried, and the carrying power is improved.

[0009]

The present invention will be described in detail below with reference to the drawings illustrating the embodiments.

FIGS. 1 and 2 exemplify a conveying screw according to the present invention. The screw 1 includes a long and flexible metal shaft 2 and a spiral around the shaft 2 at a predetermined pitch. It is composed of a metallic coil portion 3 wound in a circular shape, and a buffer layer 4 that covers the surface of the shaft 2 and that is closely interposed between the shaft 2 and the coil portion 3.

The shaft 2 is made of a steel cord stranded wire in which a plurality of strands are twisted together so that the rotational torque applied from one end can be sufficiently transmitted to the other end.
It is preferable to include a lubricant for reducing the friction between the wires.

The buffer layer 4 is made of an elastic material such as elastomer or soft plastic. For example, urethane rubber, chloroprene rubber, ethylene / propylene rubber, isoprene rubber, silicone rubber, low density polyethylene, polyvinyl chloride, ethylene-methyl. An acrylate copolymer, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, etc. can be used.

The coil portion 3 is in a state of biting into the surface of the buffer layer 4, and the biting depth A from the outer surface of the buffer layer 4 is 0.1B with respect to the thickness dimension B of the buffer layer 4. It is set to ≦ A ≦ 0.5B. The thickness dimension B of the buffer layer 4 is set to 0.1C ≦ B ≦ C with respect to the axial outer diameter dimension C of the coil portion 3.

As a result, the coil portion 3 is securely wound and held on the shaft 2 via the buffer layer 4. Therefore, even if a load is applied to the coil portion 3, the coil portion 3 does not expand or contract in the longitudinal direction of the shaft 2, and a gap is not easily formed between the coil portion 3 and the buffer layer 4.

The screw 1 configured as described above is used, for example, in the conveying device 5 illustrated in FIG.

The transporting device 5 is for transporting powdery or granular foodstuffs, seasonings, medicines, powdered or granular materials 8 such as chemicals and cement, and a long pipe having a motor 6 attached to the upper end thereof. The guide tube 7 is provided, and the screw 1 is provided in the guide tube 7 so as to be rotatable around the shaft center of the shaft 2.
Further, one end of the screw 1 is connected to the motor 6, and the other end is supported by a bearing (not shown).

The powdery or granular material 8 is supplied from the end portion (downward in the drawing) of the guide tube 7, and the powdery or granular material 8 is generated by the coil portion 3 of the screw 1 rotating in a predetermined direction (the direction of arrow D in the example). It is pushed up, rises in the guide tube 7, and is sequentially discharged from the branch discharge port 9.

Since the buffer layer 4 is closely provided between the shaft 2 and the coil portion 3, even if the guide tube 7 is vertical as shown in FIG. 3, the screw 1 rotates. At the time of the stop, the powder particles 8 that have been generated conventionally do not fall out, and even if the screw 1 is rotated again, the discharge amount of the powder particles 8 does not change, and highly accurate conveyance can be performed.

Further, the screw 1 can be used not only for conveying the powder or granular material 8 but also for conveying a fixed work such as the bottle 10 shown in FIG.

In the conveying device 11 for a fixed work illustrated in FIG. 4, the screw 1 is attracted and supported by the guide rail 12 by the magnetic force of a large number of magnets 24 embedded in the guide rail 12 at regular intervals. ..

Further, one guide member 13 is arranged in parallel with the screw 1 at a constant interval. Further, one end of the screw 1 is rotatably supported by a bearing (not shown), and the other end of the screw 1 is connected to a motor via a bearing (not shown).

Each bottle 10 is suspended between the screw 1 and the guide member 13, and by rotating the screw 1 around the shaft center of the shaft 2, the collar portion 14 of the bottle 10 ...
... are pushed by the coil portion 3 to translate and convey each bottle 10.

Further, if the screw 1 is used to form the conveying device 15 as shown in FIGS. 5 to 7, it is possible to convey a cylindrical container 16 such as a can or a bottle other than the above-mentioned fixed work.

In the conveying device 15, the screw 1 is rotatably inserted and held around the shaft center of the shaft 2 in a cylindrical guide body 18 having a single slit portion 17 formed continuously in the axial direction. , The inner surface of the tubular guide body 18 is brought into close proximity or in sliding contact with a minute gap.

Further, the guide members 19 are arranged in parallel along the cylindrical guide body 18. The guide members 19 are provided at three locations (in the illustrated example, both shoulder corners and bottom corners of the container 16) to guide and guide the container 16 and prevent the container 16 from collapsing during transportation.

Both ends of the screw 1 are provided with bearings 20,
An end of the screw 1 rotatably supported by 21 and supported by one bearing 20 is connected to a motor 22. The width dimension of the slit portion 17 is set so that the screw 1 does not protrude from the slit portion 17.

The container 16 includes a tubular guide body 18 and a guide member 19.
The screw 1 in which a part of the outer peripheral portion of the container 16 is rotated through a slit portion 17 which is inserted between
Is continuously contacted and pressed by the coil portion 3 of the
19 and the container 16 along the notched surfaces 23, 23 of the tubular guide body 18.
Is transported.

In the carrying device 15 illustrated in FIG. 6, the flanged bottle or the like, a spherical shaped work piece or a powder or granular material (separately stored in a storage container) is also a cylindrical guide body and a guide member. Although the structure and configuration of the etc. are omitted in the figure,
Can be transported.

[0029]

Since the present invention is constructed as described above, it has the following great effects.

Since the coil portion 3 of the screw 1 is made of metal, it has good wear resistance. Moreover, since the nicking of the coil portion 3 and the shaft 2 can be prevented, the durability is improved and the life is extended. Moreover, it is possible to convey various kinds of works such as bottles, bottles, cans and the like other than the granular material, and it is very practical.

It is possible to prevent expansion and contraction of the coil portion 3 in the longitudinal direction,
The screw 1 (when the rotation is stopped) is used to convey the powder or granular material.
Since powder particles do not fall out, highly accurate transportation becomes possible. In addition, the carrying capacity is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of a main part.

FIG. 3 is a cross-sectional front view of a main part of a powder and granular material conveying device.

FIG. 4 is a perspective view of a main part of a transfer device for a fixed work.

FIG. 5 is a schematic plan view of another conveyance device for a fixed work.

FIG. 6 is a perspective view of a main part of a tubular guide body and a screw.

FIG. 7 is a cross-sectional view of a main part.

FIG. 8 is a cross-sectional side view of a main part of a conveying device using a conventional screw.

[Explanation of symbols]

 2 shaft 3 coil part 4 buffer layer

Claims (1)

[Claims] 1. A flexible metal shaft, a metal coil portion spirally wound around the shaft, a surface of the shaft is covered, and between the shaft and the coil portion. A screw for transporting, comprising a buffer layer made of an elastic material which is interposed in a close manner, and a buffer layer.