JP2533087Y2 - Rock crusher - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rock crushing apparatus for crushing rocks including rocks, bedrocks and other high-strength objects such as concrete structures, and more particularly to a rock crushing apparatus using a shape memory alloy. is there.

[0002]

2. Description of the Related Art Conventional rock crushers of this type are disclosed in Japanese Patent Application Laid-Open Nos. 60-115794 and 61-169600.
Both of them have heating means in the central part, and a shape memory alloy is arranged around the heating means and inserted into a borehole or a groove excavated in rock or bedrock. The shape memory alloy is heated by the above-mentioned heating means, and rocks and the like are crushed by deformation in the radial direction due to a change in the bending rate of the shape memory alloy due to a temperature change.

[0003]

[Problems to be Solved by the Invention] However, the rock crushing device according to the above-mentioned conventional method has not yet been put to practical use and spread. That is, in order to obtain a large force for crushing rocks or the like due to deformation of the shape memory alloy due to a temperature change (hereinafter referred to as the loading capacity of the shape memory alloy), the shape memory alloy is a block-shaped solid mass. It is desirable to have as large a mass as possible, but conventional rock crushing equipment uses a hollow part for storing the heating means in the center and shape recovery by changing the bending rate. There was a disadvantage that sufficient crushing force (hereinafter referred to as loading force) was not obtained.

[0004] Further, the existence of the above-mentioned hollow portion depends not only on its cross-sectional shape, but also on the cause of not only a little relief of stress but also of a failure to exert a sufficient loading capacity, but also an external shape is deformed by heat change (shape recovery) and expanded. When the diameter is reduced, the inner diameter of the hollow portion is also increased, which causes inconvenience in temperature transmission from the heating means to the shape memory alloy. In particular, this kind of rock crushing equipment is usually used for crushing rock etc. by using a plurality of rocks side by side and using them at the same time. If a gap is created due to the expansion of the surface, not only will the efficiency of heat conduction be reduced, but the unspecified bias of the heating means will cause variations in the heating efficiency, and multiple rock crushers may not be simultaneously deformed. However, there is a disadvantage that the overall loading capacity of the rock crusher cannot be efficiently obtained.

[0005] Also, recent studies have shown that to overcome these drawbacks, a sufficient loading force can be obtained by using shape return to change the distance between opposing end faces of a solid block-shaped shape memory alloy. A crusher has been proposed, but the use of this solid block ensures that the loading force is sufficient, but the small return stroke of the block causes cracks in the rock, but breaks the crushed rock. May not be enough.

Therefore, the technical problem of the present invention is to form a shape memory alloy in a block shape and to have a slit in the center of the block at right angles to both end faces, so that a sufficient loading force and a moving amount can be obtained. It is an object of the present invention to provide a rock crushing device.

[0007]

According to the present invention, there is provided a pair of loading plates having recesses opposed to each other, and a driving member made of a shape memory alloy disposed in a space defined by the recesses. The rock crushing device is characterized in that the driving member extends in the direction opposite to the pair of loading plates due to a temperature change, and has a hole in the middle of the direction of opposition.

According to the present invention, there are provided a pair of loading plates having recesses opposed to each other, and a plurality of drive members made of a shape memory alloy disposed in a space defined by the recesses. The rock crushing device is characterized in that the rock crushing device extends in a direction facing the pair of loading plates due to a temperature change, and at least one of the plurality of driving members has a hole in the middle of the facing direction. can get.

[0009]

In the present invention, when the rock crushing device is inserted into the bore hole, the interval between the pair of loading plates is determined by the driving member inserted into the concave space of the pair of loading plates. That is, the driving member is reduced along the direction in which the load plate faces below the martensite transformation temperature.
During rock crushing, the driving member is heated to a temperature equal to or higher than the reverse transformation temperature, extends along the facing direction of the loading plate, and crushes the rock by increasing the spacing between the loading plates.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a rock crushing device according to an embodiment of the present invention.
(A) is a front view, (b) is a side view. In the figure,
The rock crushing device includes a pair of loading plates 2 each having an arc-shaped surface and a concave portion 2a on the other surface opposite to the one surface, and the loading plates 2, 2 having the concave portions 2a, 2a facing each other. 2a, a plurality of driving members 1, 1, 1 made of a columnar shape memory alloy mounted in a space defined by 2a and 2a. The driving member 1 is of a conventionally known composition having a columnar shape, particularly preferably a TiNi-based alloy.

As shown in FIG. 2A, the driving member 1 has a slit groove 10 provided in a part of a column. When this driving member is compressed and deformed in the vicinity of the martensitic transformation temperature of the alloy used, it is deformed as shown in FIG. When this is heated to a temperature equal to or higher than the reverse transformation temperature of the alloy used, the shape is restored again as shown in FIG. As an example, when the columnar length in FIG. 2A is 35 mm, even if the columnar length is changed to 30 mm as shown in FIG. 2B, the shape is completely recovered by heating. this is,
This is because the amount of deformation increases due to the bending deformation of the slit groove as compared with the case where the columnar solid body is compressed.

FIG. 2C shows another example of the drive member 1 (the shape of the deformation is indicated by a broken line 1 '). This drive member can be deformed near the martensitic transformation temperature. The amount is limited to about 6%, and if it exceeds, even if it is heated above the reverse transformation temperature, it will not be completely restored. As an example, a 32 mm column of this type is limited to a compressive deformation of about 2 mm.

FIG. 3 shows the relationship between the recovery force and the recovery stroke in the reverse transformation of the drive member shown in FIG. 2B and the drive member shown in FIG. In the drawing, a curve 31 corresponds to the driving member shown in FIG. 2B, and a curve 32 corresponds to the driving member having no slit groove 10 shown in FIG. 2C. As is clear from FIG. 3, the recovery force of the drive member represented by the curve 31 is inferior to the curve 32, but the recovery force and the recovery stroke are overwhelmingly superior. When crushing rock, the method of crushing differs depending on the properties of the target structure. That is, when a sufficient force is not required for the initial loading, only the driving member 1 shown in FIG. 2B is sufficient for (crushing of a concrete block, etc.), and the initial loading force is required. Is required, a combination of a driving member shown in FIG. 2B and a driving member having no slit groove 10 shown in FIG. 2C is required, and the combination of the driving members is appropriately selected depending on the object. Is done. Further, as a method of actually crushing a rock, a rock crushing device in which a driving member 1 deformed in advance is set as shown in FIGS. 1A and 1B is inserted into a borehole or a groove of the rock, and the member 1 is heated by a heater. By heating the shape memory alloy 1 to a temperature equal to or higher than the reverse transformation temperature with hot water or the like. In the embodiment of the present invention, the driving member 1 has a columnar shape and has a slit groove 10 in the middle, but the main point of the present invention is that the recovery of the slit-shaped bending deformation is performed perpendicular to the loading plate 2. Therefore, two boards may be bonded together, and both ends may be restrained.
Of course, a lantern shape showing a letter of a letter may be used.

[0014]

[Effects of the Invention] From the above description, according to the present invention, the driving member is made of a shape memory alloy having a sufficient loading force and a large moving amount, thereby expanding the practical range of the rock crushing apparatus. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a rock crushing device of the present invention.
(A) is a front view, (b) is a side view.

FIGS. 2A and 2B are perspective views of a driving member used in the embodiment of the present invention, and FIG. 2C is a perspective view showing another example of the driving member.

FIG. 3 is a view showing a recovery force and a recovery stroke when recovering the shape of the drive member made of the shape memory alloy shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive member 2 Loading plate 2a Depression 10 Slit groove 15 Outer peripheral surface

Claims (2)

(57) [Scope of request for utility model registration] 1. A pair of loading plates having recesses opposed to each other, and a drive member made of a shape memory alloy disposed in a space defined by the recesses, wherein the drive member is configured to be driven by a change in temperature. A rock crushing device extending in a direction opposite to the loading plate, and having a hole in the middle of the direction of opposition. 2. A vehicle comprising: a pair of loading plates having recesses opposed to each other; and a plurality of drive members made of a shape memory alloy disposed in a space defined by the recesses, wherein the plurality of drive members have a temperature change. The rock crushing device according to claim 1, wherein the at least one of the plurality of driving members has a hole in the middle in the facing direction while extending in a direction facing the pair of loading plates.