JPS638448Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a screen used in a sieving device that sieves powders, lumps, etc. according to their size, and specifically relates to a sieve that uses a shape memory alloy to prevent clogging. This invention relates to a device screen.

As this type of sieving device, vibrating sieving devices and static sieving devices are known, but in both of these devices, a serious problem is how to prevent and eliminate clogging of the screen. It is becoming. Conventionally, a method using tapping balls has been known as a method for preventing clogging, but this method has problems such as being applicable only to vibrating sieve devices and complicating the device. In addition, in conventional equipment, if clogging actually occurs, the only way to clear the clogging is to temporarily stop the equipment and manually remove the material stuck in the screen, which is extremely cumbersome to handle. However, there was a problem in that it required a lot of manpower.

This invention was made in view of the above circumstances, and its purpose is to create a screen for sieve equipment that has a simple structure and can prevent and eliminate clogging without human intervention. It is about providing. A feature of this invention is that part or all of the screen for the sieving device is formed of a shape memory alloy.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

First, a case will be described in which the configuration of the first embodiment of this invention is applied to a vibrating sieve device.

1 to 4, the vibrating sieve device 1 in this embodiment has a gutter (hereinafter referred to as
(referred to as a trough) 2, a lid body 3 that closes the upper opening of the trough 2, side plates 4, 4 provided at the lower part of the trough 2, and a vibration motor 5 fixed to these side plates 4, 4. , 5, and a strut 7 that supports the trough 2 via vibration isolating springs 6, 6, 6, 6.
7, 7, 7. An inlet 8 is formed in a portion of the lid 3 located at the upstream end (right side in FIG. 2) of the trough 2, and an outlet 9a is formed at the bottom of the downstream end of the trough 2. , 9b are formed. The trough 2 is partitioned into upper and lower parts by a screen 10, except for a portion corresponding to the discharge port 9a.

Thus, when the vibration motors 5, 5 are operated, the entire trough 2 vibrates, and the powder or lumps introduced through the inlet 8 pass through the screen 10.
Those with a larger diameter than the openings are sieved through the openings, and those with a smaller diameter are discharged through the outlet 9b.

Here, the screen 10 is made of a metal such as stainless steel, and both long sides thereof are fixed to the inside of both side plates of the trough 2.
and crosspieces 12, 12, 12, 12 attached to this frame 11 at a predetermined distance in the length direction thereof, and both ends of each crosspiece are fixed to both short sides of the frame 10, and 12, 12, 12, 12 and the inner surface of the frame 10 (i.e., the screen surface)
It is composed of a large number of metal wire bodies 13, 13, . . . uniformly provided over the entire area. These metal filament bodies 13, 13... are made of, for example, nickel-
It is made of a titanium-based or copper-based shape memory alloy, and both short sides of the frame 10 and the crosspiece 1
Two each are fixed and penetrated close to each other in 2, 12, 12, 12. As shown in Fig. 4, these metal filaments 13, 13, . . . are subjected to memory treatment so that they form a wavy shape with a wavefront that matches the screen surface within the normal operating temperature range. . In this case, the crests and troughs of adjacent waves of these wavy metal filaments 13, 13, . . . coincide with each other, so that a mesh is formed as a whole.

Further, the metal filament bodies 13, 13... are heated to a certain temperature outside the temperature range by an appropriate heating means (for example, hot air or high-temperature steam sent through the inlet 8). , as shown in FIGS. 5 and 6A, memory processing is performed to form an arch shape that is curved upward or downward. In this case, these metal filaments 13, 13...
Adjacent ones are curved in opposite directions.

Therefore, according to this embodiment, the openings d of the screen 10 at the normal temperature are greatly enlarged when heated, so that objects stuck in the openings of the screen 10 fall and are removed. . In addition, in the above case, the metal filament 13, 1 during heating
3... was assumed to be curved upward or downward, but it is also possible to do this as follows. That is, the wavy shape at normal temperature may be left as is, and the wavy surface may be rotated in a direction perpendicular to the screen surface during heating. In this case, the shape of these metal filaments 13, 13, . . . when heated becomes as shown in FIGS.

Next, a second embodiment of the screen according to this invention will be described.

The screen surface of the screen 10 in this second embodiment is provided with a plain weave wire mesh as shown in FIG. 7 in place of the metal wire bodies 13, 13, . . . shown in the first embodiment. The vertical lines of this wire mesh include metal filaments 14a made of metal such as stainless steel,
14a... and a metal filament 1 made of a shape memory alloy
4b, 14b... are used alternately, and similarly for the horizontal lines, metal filament bodies 15a, 15a... made of metal such as stainless steel and metal filament bodies 15b, 15b... made of shape memory alloy are used alternately. are used alternately. And each striatum 14b, 14b...
...and 15b, 15b... are subjected to memory processing so that they have a shape that wraps approximately half a circle around each intersecting filament, as shown in Figure 8A, within the normal operating temperature range. As a result, a wire mesh with no looseness is formed as a whole. On the other hand, each of the striatum 14b, 1
When 4b..., 15b, 15b... reach a temperature that does not belong to the above-mentioned operating temperature range by being heated, each part corresponding to each intersecting striatal body becomes the apex as shown in Fig. 8(b). Memory processing is performed to form a triangular wave shape, thereby creating a loose wire mesh as a whole.

Therefore, according to this embodiment, the opening d of the wire mesh at normal temperature becomes enlarged when viewed three-dimensionally during heating, thereby preventing and eliminating clogging. In this embodiment, every other vertical line and horizontal line of the screen 10 is formed of shape memory alloy, but it is also possible to form only one of the vertical lines or horizontal lines entirely of shape memory alloy. You may also do so.
In this case, for example, if the line in the width direction of the trough 2 (that is, the line perpendicular to the flow direction of the material to be sieved) is formed of a shape memory alloy, when this is applied to a vibrating sieve device, the screen 10 becomes a mesh. The loosening causes secondary vibrations, further increasing the effectiveness of preventing and eliminating clogging.

Next, a third embodiment of this invention will be described.

As shown in FIG. 9, the screen surface of the screen 10 in the third embodiment has the first
In place of the metal wires 13, 13 in the embodiment, a metal plate 17 having a number of holes 16, 16 in a staggered pattern is provided.
The holes 16, 1 are made of a shape memory alloy.
As shown in FIG. 10, the periphery of the 6... has four radially extending notches 18, 18, 18, 1
In this case, the metal plate 17 is subjected to memory processing so that it is flat over its entire surface within the normal temperature range of use, but when it is heated to a specific temperature outside the above temperature range, the peripheral portions of the holes 16, 16 ... are subjected to memory processing so that they bend downward as shown in Figs. 10B and 11.

Therefore, in this embodiment, the openings d of the screen 10 expand during heating, thereby preventing and eliminating clogging.

Thus, in each of the embodiments described above,
If the screen 10 is configured to be heated at appropriate time intervals or as needed, clogging will hardly occur and the sieving device can therefore be operated unattended for long periods of time. becomes possible.

In addition, the screen for the sieving device according to this invention is
As is clear from its principle, it can be applied to both a vibrating sieve device and a stationary sieve device, and as a means for heating the shape memory alloy, the shape memory alloy itself constituting the screen can be used to heat the shape memory alloy. Direct heating by passing an electric current is also considered.

As is clear from the above description, the screen for a sieving device according to this invention is formed partly or entirely of a shape memory alloy, has a predetermined opening in the normal operating temperature range, and has a predetermined opening in the normal operating temperature range. Since the openings are designed to expand when the outside temperature reaches a certain temperature, clogging can be prevented and eliminated simply by changing the temperature of the screen, making the sieving device more efficient and labor-saving. Not only is this possible, but it can also improve the operating rate.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a vibrating sieve device to which a first embodiment of this invention is applied, Fig. 2 is a side view of the same device, and Fig. 3 is a view of a screen which is a first embodiment of this invention. 4 is a partially enlarged plan view of the same screen, FIG. 5 is a partially enlarged plan view of the same screen when heated, and FIGS. 7 is a partially enlarged plan view of the second embodiment of this invention, and FIGS. 8A and 8B are views taken along the - line in FIG. At normal temperature (B) is when heating, FIG. 9 is a partially enlarged plan view of the third embodiment of this invention, and FIGS. 10 (A) and (B) are partially enlarged views of FIG. B is when heating;
FIG. 11 is a view taken along the line XI-XI in FIG. 10(b). 1... Sieve device (vibrating sieve device), 10... Screen (screen for sieve device), 13... Shape memory alloy (metal filament), 14b, 15b... Shape memory alloy (metal filament) , 17...shape memory alloy (metal plate).

Claims (1)

[Scope of utility model registration request] Part or all of the shape memory alloy is formed from a shape memory alloy, and within the normal operating temperature range, the shape memory alloy is in the first state,
The shape memory alloy has an opening of a predetermined size, and is configured to expand when the shape memory alloy reaches a specific temperature that is not within the normal operating temperature range as the shape memory alloy enters a second state. A screen for a sieving device characterized by: