Wear test method

Abstract

To provide a wear test method that can reproduce a predetermined wear mode through a short-time test.SOLUTION: A wear test method includes: fixing test pieces S to a bottom face of a storage tank 2 and storing water W; introducing wear materials 5 having higher toughness than that of the test pieces S and formed in a polyhedral shape between an outer cylindrical body 22 forming the storage tank 2 and an inner core body 23 coaxial with the central axis C of the outer cylindrical body 22; rotating rotating plates 34 along a circular passage P formed by the outer cylindrical body 22 and the inner core body 23; and stirring the wear materials 5 on the top of the test pieces S.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a wear test method.

Background Art

[0002] In hydraulic structures such as dams, headrace tunnels, and open channels, wear occurs on the flowing water contact surface of the structure. It is known that wear on the flowing water contact surface progresses according to a predetermined wear pattern. That is, it is known that wear progresses according to a wear pattern (selective wear) in which the mortar part is scraped off, the coarse aggregate is exposed, and when this coarse aggregate falls out, the mortar part is further scraped off.

[0003] By the way, there is a wear test method for wearing a concrete molded product as a specimen. The test method disclosed in Non-Patent Document 1 is to fix the specimen on the bottom surface of the storage tank and rotate the rotary blade to stir the wear material together with the stored water. However, according to such a test method, since the spherical wear material rolls on the specimen at high speed, the mortar part and the coarse aggregate are worn simultaneously, and there is a problem that the above-mentioned wear pattern cannot be reproduced. Furthermore, there is also a problem that a long-term test is required.

[0004] In addition, the test method disclosed in Non-Patent Document 2 is to fix the specimen on the inner peripheral surface of the rotating cylinder and lift and drop the wear material by rotating this rotating cylinder. However, according to such a test method, since a cylindrical wear material is collided with the specimen and a large impact force is repeatedly applied, the fall-off of the coarse aggregate from the mortar part is promoted, and there is a problem that the above-mentioned wear pattern cannot be reproduced. Furthermore, although it is shorter than the test method disclosed in Non-Patent Document 1, there is also a problem that a long-term test is required.

[0005] Furthermore, the test method disclosed in Non-Patent Document 3 fixes a test specimen to the outer peripheral surface of a rotating cylinder and blows silica sand together with water while rotating this rotating cylinder. However, according to such a test method, since no large impact force is applied to the test specimen other than blowing silica sand together with water, even if the wear of the mortar part progresses, the coarse aggregate does not fall out, and there is a problem that the above-described wear mode cannot be reproduced. Furthermore, although it is shorter than the test method disclosed in Non-Patent Document 1, there is also a problem that a long-time test is required.

Prior Art Documents

Patent Documents

[0006]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] An object of the present invention is to provide a wear test method capable of reproducing a predetermined wear mode by a short-time test.

Means for Solving the Problems

[0008] This invention is characterized in that a specimen is fixed to the bottom surface of a storage tank to store a liquid, and a wear-resistant material formed in a polyhedral shape with higher toughness than the specimen is put between an outer cylinder constituting the storage tank and an inner core coaxially arranged with respect to the central axis of the outer cylinder, a rotating plate is rotated along a circular passage formed by the outer cylinder and the inner core, and the wear-resistant material is stirred above the specimen.

[0009] According to this invention, a predetermined wear mode can be reproduced by a short-time test. Specifically, for the liquid rotating in the storage tank, since the flow velocity is lower at the radially inner position than at the radially outer position, and an inner core coaxially arranged with respect to the central axis of the outer cylinder is provided at the center of the outer cylinder, it is possible to prevent the wear-resistant material from staying at the central portion. Further, since the rotating plate rotates along the circular passage formed by the outer cylinder and the inner core, it is possible to stir without disturbing the flow of the liquid. Therefore, it is possible to balance the force that the wear-resistant material tries to move to the central portion with a low flow velocity and the centrifugal force acting on the wear-resistant material, and thus it is possible to appropriately and deeply wear the surface of the specimen widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0010] As an aspect of this invention, the inner diameter of the outer cylinder may be 0.7 to 1.3 m, the weight of the wear-resistant material may be 50.0 to 130.0 g, and the rotating plate may be rotated at a speed of 50.0 to 90.0 rpm.

[0011] In this way, by setting the inner diameter of the outer cylinder to 0.7 to 1.3 m, the weight of the wear-resistant material to 50.0 to 130.0 g, and rotating the rotating plate at a speed of 50.0 to 90.0 rpm, it is possible to surely balance the force that the wear-resistant material tries to move to the central portion with a low flow velocity and the centrifugal force acting on the wear-resistant material. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0012] As another aspect of the present invention, the weight of the wear material may be set to 50.0 to 130.0 g, the maximum rotational radius of the rotating plate may be set to 0.35 to 0.55 m, and the speed at the outer peripheral edge of the rotating plate may be set to 1.5 to 5.5 m / s and rotated.

[0013] In this way, by setting the weight of the wear material to 50.0 to 130.0 g, the maximum rotational radius of the rotating plate to 0.35 to 0.55 m, and the speed at the outer peripheral edge of the rotating plate to 1.5 to 5.5 m / s and rotating, it is possible to surely balance the force with which the wear material tends to move to the central portion where the flow velocity is low and the centrifugal force acting on the wear material. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0014] As another aspect of the present invention, two or more types of wear materials having at least one of different shapes and weights may be included. Note that having at least one of different shapes and weights includes not only those with different shapes, but also those with the same shape but different weights due to material differences. Of course, those with both different shapes and weights are also included.

[0015] In this way, by including two or more types of wear materials having at least one of different shapes and weights, it is possible to repeatedly apply impact forces of different magnitudes to the surface of the test specimen, and thus appropriately wear the surface of the test specimen widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0016] As another aspect of the present invention, the inner diameter of the outer cylinder may be set to 0.7 to 1.3 m, the weight of one of the wear materials may be set to 50.0 to 90.0 g, the weight of the other wear material may be set to 90.0 to 130.0 g, and the speed of the rotating plate may be set to 50.0 to 90.0 rpm and rotated.

[0017] In this way, by setting the inner diameter of the outer cylinder to 0.7 to 1.3 m, the weight of one wear material to 50.0 to 90.0 g, the weight of the other wear material to 90.0 to 130.0 g, and rotating the rotating plate at a speed of 50.0 to 90.0 rpm, it is possible to surely balance the force that the wear material tries to move to the central part where the flow velocity is low and the centrifugal force acting on the wear material. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0018] As another aspect of the present invention, the weight of one of the wear materials may be 50.0 to 90.0 g, the weight of the other wear material may be 90.0 to 130.0 g, the maximum rotation radius of the rotating plate may be 0.35 to 0.55 m, and it may be rotated at a speed of 1.5 to 5.5 m / s at the outer peripheral side edge of the rotating plate.

[0019] In this way, by setting the weight of one wear material to 50.0 to 90.0 g, the weight of the other wear material to 90.0 to 130.0 g, the maximum rotation radius of the rotating plate to 0.35 to 0.55 m, and rotating it at a speed of 1.5 to 5.5 m / s at the outer peripheral side edge of the rotating plate, it is possible to surely balance the force that the wear material tries to move to the central part where the flow velocity is low and the centrifugal force acting on the wear material. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0020] As another aspect of the present invention, the wear material may be a polygonal prism. The polygonal prism means a three-dimensional object formed by two planes that are polygons and a plurality of side surfaces that connect the sides thereof. Specifically, a quadrangular prism is adopted.

[0021] In this way, since the wear material is a polygonal prism, an impact force can be repeatedly applied to the surface of the test specimen, and thus the surface of the test specimen can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0022] As another aspect of the present invention, the rotating plate may be rotated in a state where the distance from the outer peripheral surface of the inner core body to the inner peripheral side edge of the rotating plate is shorter than the distance from the inner peripheral surface of the outer cylindrical body to the outer peripheral side edge of the rotating plate.

[0023] In this way, by rotating the rotating plate in a state where the distance from the outer peripheral surface of the inner core body to the inner peripheral side edge of the rotating plate is shorter than the distance from the inner peripheral surface of the outer cylindrical body to the outer peripheral side edge of the rotating plate, it is possible to prevent the retention of wear consumables due to the decrease in the flow velocity in the vicinity of the inner core body, and thus the surface of the test specimen can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0024] As another aspect of the present invention, the rotating plate may be rotated in a state where the distance from the upper surface of the test specimen to the lower side edge of the rotating plate is shorter than the distance from the liquid surface of the liquid to the upper side edge of the rotating plate.

[0025] In this way, by rotating the rotating plate in a state where the distance from the upper surface of the test specimen to the lower side edge of the rotating plate is shorter than the distance from the liquid surface of the liquid to the upper side edge of the rotating plate, it is possible to prevent the retention of wear consumables due to the decrease in the flow velocity in the vicinity of the test specimen, and thus the surface of the test specimen can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0026] As another aspect of the present invention, the rotating plate may be rotated in a state where either one or both of the inner diameter of the outer cylindrical body and the outer diameter of the inner core body are adjusted so that the ratio of the inner diameter of the outer cylindrical body to the outer diameter of the inner core body falls within the range of 1.67 to 4.06.

[0027] In this way, by rotating the rotating plate while adjusting either one or both of the inner diameter of the outer cylindrical body and the outer diameter of the inner core body so that the ratio of the inner diameter of the outer cylindrical body to the outer diameter of the inner core body falls within the range of 1.67 to 4.06, an appropriate gradient can be given to the flow velocity distribution in the radial direction of the storage tank. As a result, it is possible to reliably balance the force that causes the wear-resistant material to move toward the central portion where the flow velocity is low and the centrifugal force acting on the wear-resistant material. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0028] As another aspect of the present invention, the rotating plate may be rotated while adjusting either one or both of the liquid storage amount and the area of the rotating plate so that the ratio of the cross-sectional area of the liquid in the circular passage to the area of the rotating plate falls within the range of 2.81 to 9.82.

[0029] In this way, by rotating the rotating plate while adjusting either one or both of the liquid storage amount and the area of the rotating plate so that the ratio of the cross-sectional area of the liquid in the circular passage to the area of the rotating plate falls within the range of 2.81 to 9.82, it is possible to prevent the retention of the wear-resistant material due to the decrease in the flow velocity at a position separated from the rotating plate. As a result, the surface of the test specimen can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0030] As another aspect of the present invention, the test specimens of different types may be arranged side by side in the circumferential direction on the bottom surface of the storage tank. The bottom surface of the storage tank means the bottom surface of the circular passage formed by the outer cylindrical body and the inner core body. Also, different types means different materials.

[0031] In this way, by arranging the test specimens of different types side by side in the circumferential direction on the bottom surface of the storage tank, tests can be performed simultaneously on various types of test specimens under exactly the same conditions. Therefore, in addition to the effect that a predetermined wear mode can be reproduced by a short-time test, it becomes possible to easily compare each test specimen.

[0032] As another aspect of the present invention, the test specimen collected by the core boring method may be placed on the bottom surface of the storage tank. The bottom surface of the storage tank means the bottom surface of the circular passage composed of the outer cylindrical body and the inner core body.

[0033] In this way, by placing the test specimen collected by the core boring method on the bottom surface of the storage tank, tests can be carried out simultaneously on the test specimen collected by the core boring method under exactly the same conditions. Therefore, in addition to the effect that a predetermined wear mode can be reproduced by a short-time test, it becomes possible to easily compare each test specimen.

[0034] As another aspect of the present invention, the test specimen may be a concrete molded product containing coarse aggregate. The coarse aggregate is gravel or crushed stone larger than the fine aggregate constituting the mortar part, and its type, density, etc. are not limited. Also, it is possible to test mortar formations that do not contain coarse aggregate.

[0035] In this way, since the test specimen is a concrete molded product containing coarse aggregate, a wear mode can be reproduced in which the mortar part is scraped off and the coarse aggregate is exposed, and when the coarse aggregate falls out, the mortar part is further scraped off. That is, selective wear in which the mortar part is selectively scraped off can be reproduced.

Brief Description of the Drawings

[0036]

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[0037] One embodiment of the present invention will be described in detail based on the drawings. FIG. 1 is a cross-sectional view showing the configuration of the wear test apparatus 1, and FIG. 2 is an explanatory diagram showing the situation of detaching the inner core body 23. FIG. 3 is a side view showing the configuration of the rotating plate driving unit 3, FIG. 4 is an explanatory diagram showing the situation of adjusting the radial position of the rotating plate 34, FIG. 5 is an explanatory diagram showing the situation of adjusting the vertical position of the rotating plate 34, FIG. 6 is an explanatory diagram showing the situation of adjusting the inclination angle α of the rotating plate 34 with respect to the velocity direction V, and FIG. 7 is an explanatory diagram showing the situation of adjusting the inclination angle β of the rotating plate 34 with respect to the centrifugal direction R.

[0038] Further, FIG. 8 is a cross-sectional view showing the configuration of the specimen fixing portion (circumferential fixing portion 4), FIG. 9 is an explanatory view showing the state of fixing the specimen S, FIG. 10 is a plan view showing an arrangement example of the specimen S, and FIG. 11 is a perspective view showing the first wear material 51 and the second wear material 52. FIG. 12 is an explanatory view showing the relationship between the type of the wear material 5 and the scar on the resin plate, FIG. 13 is an explanatory view showing the relationship between the combination of the wear materials 5 and the scar on the resin plate, FIG. 14 is an explanatory view showing the relationship between the presence or absence of coarse aggregate in the specimen S and the wear mode, and FIG. 15 is an explanatory view showing the specimen S before the test and the specimen S after the test. And FIG. 16 relates to another embodiment of the wear test apparatus 1 and is an explanatory view showing the state of fixing the specimen S collected by the core boring method.

[0039] As shown in FIG. 1, the wear test apparatus 1 includes a storage tank 2, a rotating plate driving unit 3, and a specimen fixing portion (circumferential fixing portion 4). Further, the wear test apparatus 1 uses a wear material 5. The wear material 5 is not a component directly attached to the wear test apparatus 1 but is essential for wearing the specimen S. Therefore, the wear material 5 is included as a component of the invention according to the present application.

[0040] <Regarding the storage tank 2> As shown in FIG. 1, the storage tank 2 stores a liquid (for example, water) W inside thereof. The storage tank 2 has a circular bottom plate 21 and a cylindrical outer cylinder body 22 whose lower opening end is closed by the bottom plate 21. Further, the storage tank 2 has an inner core body 23 coaxial with the central axis C of the outer cylinder body 22 at the center of the outer cylinder body 22. In the present application, a closed passage composed of the outer cylinder body 22 and the inner core body 23 is defined as a circular passage P.

[0041] The bottom plate 21 is a metal plate cut out in a circular shape. A support base 211 for supporting the inner core body 23 is provided on the upper surface of the bottom plate 21. The support base 211 is formed in an annular shape around the central axis C, and the specimen S is arranged so as to surround the support base 211. Further, H-shaped steel 212 combined in a lattice pattern is fixed to the lower surface of the bottom plate 21. Casters 213 used during movement are attached to the H-shaped steel 212.

[0042] The outer cylinder body 22 is formed by bending a metal plate cut out in a rectangular shape into a cylindrical shape. An L-shaped steel 221 bent in an arc shape along the circumferential direction of the outer cylinder body 22 is welded to the lower outer peripheral surface of the outer cylinder body 22. The L-shaped steel 221 is welded to the bottom plate 21 in a state of being in contact with the upper surface of the bottom plate 21. Also, an L-shaped steel 222 bent in an arc shape along the circumferential direction of the outer cylinder body 22 is welded to the upper outer peripheral surface of the outer cylinder body 22. An L-shaped steel 223 for supporting a motor 31 to be described later is bridged over the L-shaped steel 222.

[0043] The inner core body 23 is formed by cutting a resin tube formed in a cylindrical shape to a predetermined length. The lower opening end of the inner core body 23 is closed by a bottom plate 231 cut out in a circular shape, and the outer peripheral edge of this bottom plate 231 protrudes in the radially outer direction to form a flange portion 23f (see FIG. 2). The flange portion 23f is sandwiched between a retainer 233 attached to the support base 211 and the bottom plate 21 in a state of being fitted inside the aforementioned support base 211. Also, the upper opening end of the inner core body 23 is open without being closed. However, it may be closed by a plate material or the like.

[0044] Note that the wear test device 1 can detach the inner core body 23. That is, as shown in FIG. 2(a), when the inner core body 23 is present, the inner core body 23 can be removed by loosening the bolt 232 and removing the retainer 233. Also, as shown in FIG. 2(b), when the inner core body 23 is not present, the inner core body 23 can be fixed by placing the inner core body 23 and fitting the retainer 233 together and tightening the bolt 232.

[0045] With such a configuration, the wear test apparatus 1 can also change the shape of the inner core 23. Specifically, by replacing the inner core 23 with another inner core 23, it is possible to change the size (height and outer diameter) of the inner core 23, or to make it into a tapered shape or a cone shape. Considering this point, in the invention according to the present application, the shape of the inner core 23 is not limited. However, the inner core 23 must be circular in shape when viewed from above (including polygons that are substantially circular when viewed from above).

[0046] <Regarding the rotating plate driving unit 3> As shown in FIG. 3, the rotating plate driving unit 3 rotates the rotating plate 34 in the circumferential direction of the storage tank 2. The rotating plate driving unit 3 includes an electric motor 31 as a power source, a rotating arm 32 rotated by the electric motor 31, and a support shaft 33 rotated together with the rotating arm 32. The rotating plate 34 is attached to the support shaft 33. The rotation center of the rotating plate 34 is coaxial with the central axis C of the outer cylindrical body 22.

[0047] The electric motor 31 is a so-called AC motor. The electric power supplied to the electric motor 31 is appropriately controlled by the controller 30. Therefore, the driving state (rotation speed of the rotating shaft 31S) of the electric motor 31 can be freely adjusted or maintained constant. The rotating shaft 31S of the electric motor 31 extends vertically downward, and an arm holding portion 311 is attached to the lower end portion thereof.

[0048] The rotating arm 32 is a metal rod formed in a cylindrical shape. The rotating arm 32 is held in a state of being inserted into the side surface of the arm holding portion 311. The rotating arm 32 extends from the arm holding portion 311 located above the inner core 23 to the vicinity of the outer cylindrical body 22, and rotates integrally with the arm holding portion 311. In the wear test apparatus 1, two rotating arms 32 are held every 180 degrees around the central axis C, but it is also possible to hold four rotating arms 32 every 90 degrees. Further, it is also possible to hold eight rotating arms 32 every 45 degrees. A shaft holding portion 321 is attached to the tip portion of each rotating arm 32.

[0049] The support shaft 33 is also a metal rod formed in a cylindrical shape. The support shaft 33 is held in a state of being inserted from the lower side to the upper side with respect to the shaft holding portion 321. The support shaft 33 intersects perpendicularly with the rotating arm 32 extending in the horizontal direction and extends to the vicinity of the bottom plate 21, and rotates integrally with the shaft holding portion 321. In the wear test apparatus 1, since one support shaft 33 is held for each rotating arm 32, two support shafts 33 are arranged every 180 degrees. However, the number and arrangement of the support shafts 33 will change according to the number and arrangement of the rotating arms 32. A rotating plate 34 is attached to the lower end portion of each support shaft 33.

[0050] With such a configuration, when the electric motor 31 is driven, the rotating plate 34 rotates along the circular passage P via the rotating arm 32 and the support shaft 33. Then, the liquid W stored in the storage tank 2 also rotates, and the liquid surface Ws is curved by the centrifugal force acting on the liquid W. Even in this state, since the rotating arm 32 rotates at a position higher than the liquid surface Ws, the rotating arm 32 does not obstruct the flow of the liquid W. Therefore, it is possible to stir the liquid W without disturbing its flow.

[0051] Further, the rotating plate 34 of the wear test apparatus 1 is a rectangular metal plate that is long in the radial direction of the storage tank 2 (the width direction of the circular passage P). The inner peripheral side end portion of the rotating plate 34 is fixed to the support shaft 33. In other words, the support shaft 33 is fixed to the inner peripheral side end portion of the rotating plate 34. Therefore, the support shaft 33 rotates at a position close to the inner core body 23. Then, since the support shaft 33 is located in the central region where the liquid level of the liquid W is low and the flow velocity is low, even if there is a velocity difference between the support shaft 33 and the surrounding liquid W, the influence is reduced. Therefore, it is possible to stir the liquid W without disturbing its flow.

[0052] Furthermore, even when the rotating plate 34 is not rotating, the inner core body 23 of the abrasion test apparatus 1 protrudes upward from the liquid surface Ws of the liquid W. However, when the rotating plate 34 is not rotating, it is submerged in the liquid W. When the liquid level in the central region of the storage tank 2 decreases due to the rotation of the rotating plate 34, the inner core body 23 may be configured to protrude upward from the liquid surface Ws. Even with such a configuration, in a state where the rotating plate 34 is rotating, that is, in a state where the test is being performed, the flow of the liquid W can be regulated by the circular passage P. Therefore, the liquid W can be stirred without disturbing its flow.

[0053] Incidentally, the abrasion test apparatus 1 can adjust the radial position of the rotating plate 34. As shown in FIG. 4, the shaft holding portion 321 is configured to grip the rotating arm 32 by the upper piece 32a and the lower piece 32b of the main body portion. By loosening the bolt 322 that tightens these, the shaft holding portion 321 can be moved in the axial direction of the rotating arm 32.

[0054] With such a configuration, when the shaft holding portion 321 is moved in the radially outer direction, the support shaft 33 held by the shaft holding portion 321 also moves in the radially outer direction, and the rotating plate 34 attached to the support shaft 33 also moves in the radially outer direction. Conversely, when the shaft holding portion 321 is moved in the radially inner direction, the support shaft 33 held by the shaft holding portion 321 also moves in the radially inner direction, and the rotating plate 34 attached to the support shaft 33 also moves in the radially inner direction. Thus, in the abrasion test apparatus 1, the radial position of the rotating plate 34 can be adjusted.

[0055] Also, the abrasion test apparatus 1 can adjust the vertical position of the rotating plate 34. As shown in FIG. 5, the shaft holding portion 321 is configured to grip the support shaft 33 by the main body portion and the front piece 32c fixed to its front surface. By loosening the bolt 323 that tightens these, the support shaft 33 can be moved perpendicular to the axial direction of the rotating arm 32.

[0056] With such a configuration, when the support shaft 33 is moved upward, the rotating plate 34 attached to the support shaft 33 also moves upward. Conversely, when the support shaft 33 is moved downward, the rotating plate 34 attached to the support shaft 33 also moves downward. Thus, in the wear test apparatus 1, it is possible to adjust the vertical position of the rotating plate 34.

[0057] Furthermore, the wear test apparatus 1 can also adjust the inclination angle α of the rotating plate 34 with respect to the velocity direction V. As shown in FIG. 6, the shaft holding portion 321 is configured to grip the rotating arm 32 by the upper piece 32a and the lower piece 32b of the main body portion. By loosening the bolt 322 that tightens these, the shaft holding portion 321 can be rotated in the circumferential direction of the rotating arm 32.

[0058] With such a configuration, when the shaft holding portion 321 is rotated clockwise as viewed from the side, the support shaft 33 held by the shaft holding portion 321 also rotates clockwise, and the rotating plate 34 attached to the support shaft 33 also rotates clockwise. Conversely, when the shaft holding portion 321 is rotated counterclockwise as viewed from the side, the support shaft 33 held by the shaft holding portion 321 also rotates counterclockwise, and the rotating plate 34 attached to the support shaft 33 also rotates counterclockwise. Thus, in the wear test apparatus 1, it is possible to adjust the inclination angle α of the rotating plate 34 with respect to the velocity direction V.

[0059] In addition, the wear test apparatus 1 can also adjust the inclination angle β of the rotating plate 34 with respect to the centrifugal direction (the radially outer direction of the storage tank 2) R. As shown in FIG. 7, among the upper and lower two bolt holes 34h provided in the rotating plate 34, the upper bolt hole 34h is in an arc-shaped oval shape. By loosening the bolt 341 screwed into the support shaft 33 through this bolt hole 34h, the rotating plate 34 can be rotated with respect to the axial direction of the support shaft 33.

[0060] With such a configuration, the rotating plate 34 can be tilted so that the radially outer end is higher than the radially inner end. Conversely, the rotating plate 34 can also be tilted so that the radially outer end is lower than the radially inner end. Thus, in the wear test apparatus 1, it is possible to adjust the tilt angle β of the rotating plate 34 with respect to the centrifugal direction R.

[0061] <Regarding the circumferential direction fixing part 4> As shown in FIG. 8, the circumferential direction fixing part 4 fixes the flat specimen S placed on the bottom surface of the storage tank 2 (the bottom surface of the circular passage P). The circumferential direction fixing part 4 includes an outer circumferential side fixture 41 that fixes the outer circumferential side end of the specimen S and an inner circumferential side fixture 42 that fixes the inner circumferential side end of the specimen S. Further, the circumferential direction fixing part 4 includes an elastic tube 43 in order to mitigate the impact force caused by the collision of the wear material 5.

[0062] The outer circumferential side fixture 41 is an L-shaped steel bent in an arc shape along the inner circumferential surface of the outer cylinder body 22. The outer circumferential side fixture 41 has a vertical plate 411 extending toward the bottom side of the storage tank 2 and a horizontal plate 412 extending in the radially inner direction, and the elastic tube 43 is disposed on the upper surface of this horizontal plate 412. Therefore, when the vertical plate 411 is inserted into the gap between the specimen S and the outer cylinder body 22, the horizontal plate 412 abuts against the upper surface of the outer circumferential side end of the specimen S, and the elastic tube 43 is positioned on the upper surface of this horizontal plate 412.

[0063] The inner circumferential side fixture 42 is an L-shaped steel bent in an arc shape along the outer circumferential surface of the inner core body 23. The inner circumferential side fixture 42 has a vertical plate 421 extending toward the bottom side of the storage tank 2 and a horizontal plate 422 extending in the radially outer direction, and the elastic tube 43 is disposed on the upper surface of this horizontal plate 422. Therefore, when the vertical plate 421 is inserted into the gap between the specimen S and the inner core body 23, the horizontal plate 422 abuts against the upper surface of the inner circumferential side end of the specimen S, and the elastic tube 43 is positioned on the upper surface of this horizontal plate 422.

[0064] Note that the circumferential fixing portion 4 can sandwich the specimen S between the outer circumferential side fixture 41 and the inner circumferential side fixture 42. That is, as shown in Fig. 9(a), after inserting the outer circumferential side fixture 41 and the inner circumferential side fixture 42 from above so as to hold both ends of the specimen S, as shown in Fig. 9(b), by tightening the bolt 44 inserted from the outer peripheral surface side to the inner peripheral surface side of the outer cylinder body 22, the outer circumferential side fixture 41 can be moved toward the inner circumferential side fixture 42 to sandwich the specimen S. In this way, the specimen S is prevented from shifting due to the resistance caused by the flow of the liquid W and the impact force caused by the collision of the wear material 5.

[0065] In addition, the outer circumferential side fixture 41 and the inner circumferential side fixture 42 can sandwich three specimens S arranged side by side in the circumferential direction on the bottom surface of the circular passage P. That is, as shown in Fig. 10, a set of three specimens S formed in a fan shape when viewed from above can be sandwiched simultaneously. In the wear test apparatus 1, since fifteen specimens S can be placed side by side in the circumferential direction on the bottom surface of the circular passage P, it is necessary to prepare about five sets of three specimens S. Therefore, for example, when the material properties are changed for each set of three specimens S, it becomes possible to conduct tests on five types of specimens S simultaneously under exactly the same conditions.

[0066] <Regarding the wear material 5> As shown in Fig. 11, the wear test apparatus 1 uses one type or two types of wear materials 5. In this application, for the two selected types of wear materials 5, the smaller wear material 5 is defined as the first wear material 51, and the larger wear material 5 is defined as the second wear material 52. The wear material 5 (the first wear material 51 and / or the second wear material 52) is placed on the upper part of the specimen S fixed to the bottom surface after being put inside the storage tank 2 (see Fig. 1).

[0067] The first friction consumable 51 is a metal formation formed in a quadrangular prism shape. In this embodiment, the vertical dimension x and the horizontal dimension y of the first friction consumable 51 are both 19 mm, and the length dimension z is 20 mm. And the weight per one is 56.7 g. However, regarding the shape and weight of the first friction consumable 51, as long as the force for the first friction consumable 51 to move to the central portion with a low flow rate as a whole while rolling on the specimen S in the circular passage P with irregular behavior can be balanced with the centrifugal force acting on the first friction consumable 51, it is not limited as a strict value.

[0068] Therefore, regarding the shape of the first friction consumable 51, it is only limited to being a prism shape, and regarding its weight, it is limited to being within the range of 50.0 to 90.0 g. Making the first friction consumable 51 smaller (lighter) than the second friction consumable 52 described later is considered in terms of applying a relatively small impact force to the specimen S and rolling while spreading in the width direction of the circular passage P.

[0069] The second friction consumable 52 is also a metal formation formed in a quadrangular prism shape. In this embodiment, the vertical dimension x and the horizontal dimension y of the second friction consumable 52 are both 19 mm, and the length dimension z is 40 mm. And the weight per one is 113.4 g. However, regarding the shape and weight of the second friction consumable 52 as well, as long as the force for the second friction consumable 52 to move to the central portion with a low flow rate as a whole while rolling on the specimen S in the circular passage P with irregular behavior can be balanced with the centrifugal force acting on the second friction consumable 52, it is not limited as a strict value.

[0070] Therefore, regarding the shape of the second friction consumable 52, it is only limited to being a prism shape, and regarding its weight, it is limited to being within the range of 90.0 to 130.0 g. Making the second friction consumable 52 larger (heavier) than the first friction consumable 51 described above is considered in terms of applying a relatively large impact force to the specimen S and rolling without spreading in the width direction of the circular passage P.

[0071] Note that the first wear material 51 and the second wear material 52 are formed of hot-rolled steel for general structures. Therefore, they are considered to have higher toughness (resistance to fracture or material tenacity) than the specimen S which is a concrete formation. Also, when conducting tests using the two types of wear materials 5, a plurality of the first wear materials 51 and the second wear materials 52 are respectively introduced. However, the number of the first wear materials 51 and the second wear materials 52 introduced is not limited to a strict value as it should be optimized considering the width and depth of the worn area on the specimen S, the time required for the test, etc.

[0072] <Regarding the test method and results of the wear test device 1> Hereinafter, the main specifications of the wear test device 1 will be described, as well as the reasons for determining the rotation speed of the rotating plate 34, the reasons for determining the shape of the wear material 5, and the reasons for selecting the short prism (first wear material 51) and the prism (second wear material 52) as the wear material 5. Then, the results of the tests conducted on the specimen S such as a concrete formation will be described.

[0073] First, the main specifications of the wear test device 1 will be described. In this embodiment, the outer cylinder 22 of the wear test device 1 has an inner diameter of 1055 mm. Also, the inner core 23 of the wear test device 1 has an outer diameter of 370 mm. Therefore, the circular passage P formed by the outer cylinder 22 and the inner core 23 has a width of 342.5 mm, and the ratio of the inner diameter of the outer cylinder 22 to the outer diameter of the inner core 23 is 2.85. Further, the liquid W is stored in such a storage tank 2 (circular passage P) so that the liquid level becomes 400 mm. At this time, when calculating with the area of the rotating plate 34 being 19950 mm 2 it is 6.87.

[0074] Note that the inner diameter of the outer cylinder 22 is only required to fall within the range of 0.7 to 1.3 m as a result. This is because the radial position of the rotating plate 34 can be adjusted by about ±100 mm, so it is set to 1055 ± 100 mm, with a slight margin taken from this. It has been confirmed that even if the rotation speed of the rotating plate 34 is the same, no significant difference appears in the test results as long as the inner diameter of the outer cylinder 22 is within the range of at least 0.7 to 1.3 m. Further, regarding the outer diameter of the inner core 23, it has been confirmed that if it is within the range of 0.32 to 0.42 m, the various wear materials 5 will not stay in the central part regardless of the inner diameter of the outer cylinder 22. Therefore, the ratio of the inner diameter of the outer cylinder 22 to the outer diameter of the inner core 23 can be expressed as 1.67 to 4.06.

[0075] In addition, the inclination angle α of the rotating plate 34 with respect to the velocity direction V is 90 degrees, and the inclination angle β of the rotating plate 34 with respect to the centrifugal direction R is 0 degree. Also, the distance D1 from the outer peripheral surface of the inner core 23 to the inner peripheral side edge of the rotating plate 34 is made shorter than the distance D2 from the inner peripheral surface of the outer cylinder 22 to the outer peripheral side edge of the rotating plate 34 (see Fig. 1). Further, the distance D3 from the upper surface of the test specimen S to the lower side edge of the rotating plate 34 is made shorter than the distance D4 from the liquid surface Ws of the liquid W to the upper side edge of the rotating plate 34 (see Fig. 1). And for the distances D1 and D3, values larger than 40 mm, which is the length dimension z of the second wear material 52, are adopted. This is to prevent the first wear material 51 and the second wear material 52 from colliding with the rotating plate 34.

[0076] Furthermore, the rotating plate 34 of the wear test apparatus 1 has a maximum rotation radius (the radius through which the outermost end portion passes when the rotating plate 34 rotates: synonymous with the outer peripheral side edge) of 453.5 mm. For the maximum rotation radius of such a rotating plate 34, it is considered that it suffices to fall within the range of 0.35 to 0.55 m as a result. This is because the radial position of the rotating plate 34 can be adjusted by about ±100 mm, so it is set as 453.5 ± 100 mm, and a slight margin is taken therefrom. It has been confirmed that if the maximum rotation radius of the rotating plate 34 falls within at least the range of 0.35 to 0.55 m, even if the inner diameter of the outer cylinder 22 is different, no significant difference will appear in the test results. However, such values will largely depend on the area of the rotating plate 34.

[0077] Next, the background for determining the rotation speed of the rotating plate 34 will be described. Before the first wear material 51 and the second wear material 52 were selected as the wear materials 5, six types (No. 1 to 6) shown in Table 1 below were listed as candidates. These candidates are all formed of hot-rolled steel for general structures, and their respective shapes and weights are as shown in Table 1. The first wear material 51 corresponds to No. 4, and the second wear material 52 corresponds to No. 3.

[0078]

Table 1

[0079] When determining the rotation speed of the rotating plate 34, about 6 pieces of each of the wear materials listed as candidates were put in, and the behavior of the wear materials sunk in the circular passage P was observed with the rotation speed of the rotating plate 34 as a parameter. The results are shown in Table 2 below.

[0080]

Table 2

[0081] Through such experiments, it was confirmed that for the wear consumables No.1 to No.5, the rotating plate 34 rolls while vertically and horizontally rotating at a rotational speed of around 70 rpm. For the wear consumable No.6, since it is spherical, it rolls at all rotational speeds, but it only passes through the outermost part of the circular passage P, and it is considered impossible to appropriately and deeply wear the surface of the test specimen S. Therefore, excluding the wear consumable No.6, the rotational speed of the rotating plate 34 was set to 50 to 90 rpm.

[0082] Next, the reasons for determining the shape of the wear consumable 5 will be described. When determining the shape of the wear consumable, about 20 pieces of each of the candidate wear consumables were put in one by one, and with the rotational speed of the rotating plate 34 set to 70 rpm, the scars on the resin plate fixed in place of the test specimen S were observed. The results are shown in Table 3 below and Figure 12.

[0083]

Table 3

[0084] Through such experiments, it was confirmed that when the wear consumable has a prismatic shape rather than a cylindrical shape, the distribution bandwidth and the concentration bandwidth of the scars are larger, and furthermore, the ratio of the concentration bandwidth to the distribution bandwidth is also larger. From this, it is considered that the prismatic shape has a higher wear promotion effect than the cylindrical shape. Also, for the wear consumable No.5, although the number of scars is large, they are generally shallow, and it is considered that the wear promotion effect is small. Therefore, excluding the wear consumable No.5, the shape of the wear consumable 5 was determined to be a prismatic shape.

[0085] Next, the reasons for selecting the short prismatic body (the first wear consumable 51) and the prismatic body (the second wear consumable 52) as the wear consumable 5 will be described. As described above, the liquid W rotating in the storage tank 2 has a lower flow velocity at the radially inner position than at the radially outer position. Therefore, it is important to balance the force that causes the wear material 5 to move toward the central portion with a lower flow velocity and the centrifugal force acting on the wear material 5. Therefore, while using the No. 4 wear material, which has a relatively high wear promotion effect, as a basis, about 20 pieces of each of the other wear materials were combined and put in, and with the rotation speed of the rotating plate 34 being 70 rpm, the scars on the resin plate fixed in place of the test specimen S were observed. The results are shown in Table 4 below and FIG. 13.

[0086]

Table 4

[0087] Through such experiments, it was confirmed that when the No. 4 wear material and the No. 3 wear material were combined, the distribution bandwidth and the concentration bandwidth of the scars were large, and furthermore, the ratio of the concentration bandwidth to the distribution bandwidth became large. In particular, when a 30-minute test was conducted with this combination, it was confirmed that the distribution bandwidth and the concentration bandwidth were larger than when about 60 pieces of the No. 5 wear material were put in for reference, and furthermore, the ratio of the concentration bandwidth to the distribution bandwidth also became large. Also, it was confirmed that the distribution bandwidth and the concentration bandwidth were larger than when about 1.0 kg of crushed stone was put in for reference, and furthermore, the ratio of the concentration bandwidth to the distribution bandwidth also became large. Therefore, as the wear material 5, a short prismatic body (first wear material 51), which is the No. 4 wear material, and a prismatic body (second wear material 52), which is the No. 3 wear material, were selected.

[0088] Next, the results of the test on the test specimen S such as the concrete formation will be described. In this test, about 80 pieces of the first wear material 51 were put in, and the rotation speed of the rotating plate 34 was 70 rpm. Regarding the wear amount of each test specimen S, it was measured at a pitch of 0.1 mm using a laser distance meter along seven measurement lines set in the radial direction.

[0089] Here, first, the specimen S will be described. As described above, in the abrasion test apparatus 1, since fifteen specimens S can be placed side by side in the circumferential direction on the bottom surface of the circular passage P, it is necessary to prepare about five sets of three specimens S each. Therefore, for example, when the material properties are changed for each set of three specimens S, it becomes possible to conduct tests on the five types of specimens S simultaneously under exactly the same conditions.

[0090] As shown in Table 5 below, for the five types of specimens S, Nos. 1 to 3 are concrete formations. Comparing the concrete formations of No. 1 and No. 2, although the target strengths are equal, the sizes of the coarse aggregates are different. Also, comparing the concrete formations of No. 2 and No. 3, although the sizes of the coarse aggregates are equal, the target strengths are different. And No. 4 is a mortar formation, and No. 5 is a so-called UFC (Ultra high strength Fiber reinforced Concrete) formation.

[0091]

Table 5

[0092] As a result of such tests, the following results were obtained. That is, regarding the specimen S of No. 2, as shown in Fig. 14(a), it can be seen that the abrasion region extends to about 150 mm from the outer peripheral side end of the specimen S. Also, although there are variations due to the distribution of the coarse aggregates, it can be seen that the abrasion amount is large in the range of 30 to 40 mm from the outer peripheral side end. On the other hand, regarding the specimen S of No. 4, as shown in Fig. 14(b), the abrasion region is a smooth curved surface, and it can be seen that the abrasion mode is different from that of the specimen S of No. 2. This is considered to be because in addition to the high abrasion rate of the mortar and the absence of coarse aggregates, once a groove is formed, the abrasion material 5 preferentially passes through.

[0093] Finally, FIG. 15(a) shows the specimen S before the test, and FIG. 15(b) shows the specimen S after the test. Such a specimen S is a concrete formation containing coarse aggregate No. 2. From FIG. 15(b), it can be seen that for such a specimen S, the mortar part is scraped off and the coarse aggregate is exposed, and when this coarse aggregate falls out, the mortar part is further scraped off, reproducing the wear mode. That is, it can be seen that selective wear in which the mortar part is selectively scraped off is reproduced.

[0094] As described above, in the wear test method according to the present invention, the specimen S is fixed to the bottom surface of the storage tank 2 to store the liquid W, and a wear material 5 formed in a polyhedral shape with higher toughness than the specimen S is put between the outer cylinder 22 constituting the storage tank 2 and the inner core 23 coaxial with the central axis C of the outer cylinder 22, the rotating plate 34 is rotated along the circular passage P formed by the outer cylinder 22 and the inner core 23, and the wear material 5 is stirred above the specimen S.

[0095] According to such a wear test method, a predetermined wear mode can be reproduced by a short-time test. Specifically, the liquid W rotating in the storage tank 2 has a lower flow velocity at the radially inner position than at the radially outer position. Since the inner core 23 coaxial with the central axis C of the outer cylinder 22 is provided at the center of the outer cylinder 22, it is possible to prevent the wear material 5 from staying at the central part. Further, since the rotating plate 34 rotates along the circular passage P formed by the outer cylinder 22 and the inner core 23, it can be stirred without disturbing the flow of the liquid W. Therefore, the force for the wear material 5 to move to the central part with a low flow velocity can be balanced with the centrifugal force acting on the wear material 5, and thus the surface of the specimen S can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0096] In such a wear test method, the inner diameter of the outer cylinder 22 is set to 0.7 to 1.3 m, the weight of the wear material 5 is set to 50.0 to 130.0 g, and the rotating plate 34 is rotated at a speed of 50.0 to 90.0 rpm.

[0097] In this way, by setting the inner diameter of the outer cylinder 22 to 0.7 to 1.3 m, the weight of the wear material 5 to 50.0 to 130.0 g, and rotating the rotating plate 34 at a speed of 50.0 to 90.0 rpm, it is possible to surely balance the force that the wear material 5 tries to move to the central portion with a low flow rate and the centrifugal force acting on the wear material 5. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0098] Further, in such a wear test method, two or more types of wear materials 5 are included in which at least one of the shape and the weight is different. Note that at least one of the shape and the weight being different means that in addition to those with different shapes, those with the same shape but different weights due to material differences are applicable. Of course, those with both different shapes and weights are also applicable.

[0099] In this way, by including two or more types of wear materials 5 in which at least one of the shape and the weight is different, it is possible to repeatedly apply impact forces of different magnitudes to the surface of the test specimen S, and thus it is possible to appropriately wear the surface of the test specimen S widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0100] Further, in such a wear test method, the inner diameter of the outer cylinder 22 is set to 0.7 to 1.3 m, the weight of the first wear material 51 is set to 50.0 to 90.0 g, the weight of the second wear material 52 is set to 90.0 to 130.0 g, and the rotating plate is rotated at a speed of 50.0 to 90.0 rpm.

[0101] In this way, by setting the inner diameter of the outer cylinder 22 to 0.7 to 1.3 m, the weight of the first wear material 51 to 50.0 to 90.0 g, the weight of the second wear material 52 to 90.0 to 130.0 g, and rotating the rotating plate 34 at a speed of 50.0 to 90.0 rpm, it is possible to surely balance the force that the first wear material 51 and the second wear material 52 try to move to the central portion with a low flow rate and the centrifugal force acting on the first wear material 51 and the second wear material 52. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0102] Also, in such a wear test method, the first wear material 51 and the second wear material 52 are polygonal prisms. Note that the polygonal prism means a three-dimensional formation formed by two planes that are polygons and a plurality of side surfaces connecting their sides. Specifically, a quadrangular prism is adopted.

[0103] In this way, since the first wear material 51 and the second wear material 52 are polygonal prisms, an impact force can be repeatedly applied to the surface of the test specimen S, and thus the surface of the test specimen S can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0104] Also, in such a wear test method, the rotating plate 34 is rotated in a state where the distance D1 from the outer peripheral surface of the inner core 23 to the inner peripheral side edge of the rotating plate 34 is shorter than the distance D2 from the inner peripheral surface of the outer cylinder 22 to the outer peripheral side edge of the rotating plate 34.

[0105] In this way, by rotating the rotating plate 34 in a state where the distance D1 from the outer peripheral surface of the inner core 23 to the inner peripheral side edge of the rotating plate 34 is shorter than the distance D2 from the inner peripheral surface of the outer cylinder 22 to the outer peripheral side edge of the rotating plate 34, it is possible to prevent the first wear material 51 and the second wear material 52 from staying due to the decrease in the flow velocity in the vicinity of the inner core 23, and thus the surface of the test specimen S can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0106] Also, in such a wear test method, the rotating plate 34 is rotated in a state where the distance D3 from the upper surface of the test specimen S to the lower side edge of the rotating plate 34 is shorter than the distance D4 from the liquid surface Ws of the liquid W to the upper side edge of the rotating plate 34.

[0107] In this way, by rotating the rotary plate 34 with the distance D3 from the upper surface of the specimen S to the lower edge of the rotary plate 34 being shorter than the distance D4 from the liquid surface Ws of the liquid W to the upper edge of the rotary plate 34, it is possible to prevent the first and second abrasives 51 and 52 from staying due to the decrease in the flow velocity in the vicinity of the specimen S. As a result, the surface of the specimen S can be worn appropriately widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0108] Further, in such a wear test method, the rotary plate 34 is rotated with either one or both of the inner diameter of the outer cylinder 22 and the outer diameter of the inner core 23 adjusted so that the ratio of the inner diameter of the outer cylinder 22 to the outer diameter of the inner core 23 falls within the range of 1.67 to 4.06.

[0109] In this way, by rotating the rotary plate 34 with either one or both of the inner diameter of the outer cylinder 22 and the outer diameter of the inner core 23 adjusted so that the ratio of the inner diameter of the outer cylinder 22 to the outer diameter of the inner core 23 falls within the range of 1.67 to 4.06, an appropriate gradient can be given to the radial flow velocity distribution in the storage tank 2. As a result, the force that the first and second abrasives 51 and 52 tend to move to the central portion with a low flow velocity and the centrifugal force acting on the first and second abrasives 51 and 52 can be surely balanced. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0110] Further, in such a wear test method, the rotary plate 34 is rotated with either one or both of the storage amount of the liquid W and the area of the rotary plate 34 adjusted so that the ratio of the cross-sectional area of the liquid W in the circular passage P to the area of the rotary plate 34 falls within the range of 2.81 to 9.82.

[0111] In this way, with the ratio of the cross-sectional area of the liquid W in the circular passage P to the area of the rotating plate 34 falling within the range of 2.81 to 9.82, by adjusting either one or both of the storage amount of the liquid W and the area of the rotating plate 34, and rotating the rotating plate 34, it is possible to prevent the retention of the first wear material 51 and the second wear material 52 caused by the decrease in the flow velocity at a position separated from the rotating plate 34. As a result, the surface of the test specimen S can be appropriately and deeply worn. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0112] Also, in such a wear test method, test specimens S of different types are arranged side by side in the circumferential direction on the bottom surface of the storage tank 2. Note that the bottom surface of the storage tank 2 means the bottom surface of the circular passage P formed by the outer cylindrical body 22 and the inner core body 23. Also, different types means different materials.

[0113] In this way, by arranging test specimens S of different types side by side in the circumferential direction on the bottom surface of the storage tank 2, tests can be performed simultaneously on various types of test specimens S under exactly the same conditions. Therefore, in addition to the effect that a predetermined wear mode can be reproduced by a short-time test, it becomes possible to easily compare each test specimen S.

[0114] Also, in such a wear test method, the test specimen S is a concrete molded product containing coarse aggregate. Note that the coarse aggregate is gravel or crushed stone larger than the fine aggregate constituting the mortar portion, and its type, density, etc. are not limited. Also, it is possible to test mortar formations that do not contain coarse aggregate.

[0115] In this way, since the test specimen S is a concrete molded product containing coarse aggregate, a wear mode can be reproduced in which the mortar portion is scraped off and the coarse aggregate is exposed, and when the coarse aggregate falls off, the mortar portion is further scraped off. That is, selective wear in which the mortar portion is selectively scraped off can be reproduced.

[0116] In the correspondence between the configuration of this invention and the above-described embodiment, the wear test apparatus of this invention corresponds to the wear test apparatus 1, Similarly hereinafter, the storage tank corresponds to the storage tank 2, the rotating plate drive unit corresponds to the rotating plate drive unit 3, the circumferential fixing portion corresponds to the circumferential fixing portion 4, the wear material corresponds to the wear material 5 (the first wear material 51 and the second wear material 52), the insertion fixing portion corresponds to the insertion fixing portion 6, corresponds to the outer cylinder 22, corresponds to the inner core 23, corresponds to the rotating arm 32, corresponds to the support shaft 33, corresponds to the rotating plate 34, corresponds to the central axis C, the circular passage corresponds to the circular passage P, the test specimen corresponds to the test specimen S, the liquid corresponds to the liquid W, the liquid level corresponds to the liquid level Ws. However, this invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

[0117] For example, as described above, in the wear test method according to the present invention, the weight of the wear material 5 is set to be in the range of 50.0 to 130.0 g. And, the maximum rotation radius of the rotating plate 34 (the radius through which the outermost end portion passes when the rotating plate 34 rotates: synonymous with the outer peripheral side edge) is in the range of 0.35 to 0.55 m, and the speed of the rotating plate 34 is in the range of 50.0 to 90.0 rpm. At this time, the speed at the outer peripheral side edge of the rotating plate 34 can be calculated to be 1.5 to 5.5 m / s based on a predetermined mathematical formula.

[0118] Therefore, in such a wear test method, it can be expressed that the weight of the wear material 5 is 50.0 to 130.0 g, the maximum rotation radius of the rotating plate 34 is 0.35 to 0.55 m, and the rotating plate 34 is rotated with the speed at the outer peripheral side edge being 1.5 to 5.5 m / s.

[0119] In this way, by setting the weight of the wear material 5 to 50.0 to 130.0 g, the maximum rotation radius of the rotating plate 34 to 0.35 to 0.55 m, and rotating the rotating plate 34 at a speed of 1.5 to 5.5 m / s at the outer peripheral edge, the force that the wear material 5 tries to move to the central part with a low flow rate and the centrifugal force acting on the wear material 5 can be surely balanced. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0120] Furthermore, as described above, in the wear test method according to the present invention, the first wear material 51 and the second wear material 52 are used as the wear material 5, the weight of the first wear material 51 is within the range of 50.0 to 90.0 g, and the weight of the second wear material 52 is within the range of 90.0 to 130.0 g. And the maximum rotation radius of the rotating plate 34 (the radius through which the outermost end part passes when the rotating plate 34 rotates: synonymous with the outer peripheral edge) is within the range of 0.35 to 0.55 m, and similarly the speed at the outer peripheral edge of the rotating plate 34 is within the range of 1.5 to 5.5 m / s.

[0121] Therefore, in such a wear test method, it can be expressed that the weight of the first wear material 51 is 50.0 to 90.0 g, the weight of the second wear material 52 is 90.0 to 130.0 g, the maximum rotation radius of the rotating plate 34 is 0.35 to 0.55 m, and the rotating plate 34 is rotated at a speed of 1.5 to 5.5 m / s at the outer peripheral edge.

[0122] In this way, by setting the weight of the first wear material 51 to 50.0 to 90.0 g, the weight of the second wear material 52 to 90.0 to 130.0 g, the maximum rotation radius of the rotating plate 34 to 0.35 to 0.55 m, and rotating the rotating plate 34 at a speed of 1.5 to 5.5 m / s at the outer peripheral edge, the force that the first wear material 51 and the second wear material 52 try to move to the central part with a low flow rate and the centrifugal force acting on the first wear material 51 and the second wear material 52 can be surely balanced. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0123] In addition, in the wear test apparatus 1, a specimen fixing portion (insertion fixing portion 6) for fixing the cylindrical specimen S in a state of being inserted into the bottom surface of the storage tank 2 may be provided. That is, as shown in FIG. 16, a cylindrical insertion hole 6h may be provided in the bottom plate 21 of the storage tank 2, and an insertion fixing portion 6 for fixing the cylindrical specimen S in a state of being inserted into the insertion hole 6h may be provided.

[0124] In this case, an adjustment table 61 may be provided to adjust the height of the upper surface of the specimen S and its surroundings to be the same. The adjustment table 61 is provided with an insertion hole 61h through which the specimen S is inserted, and is fixed in a state of being sandwiched between an outer peripheral side fixture 41 and an inner peripheral side fixture 42. Further, the adjustment table 61 preferably has a wear resistance that is at least higher than that of the specimen S. This is because if the wear of the adjustment table 61 progresses quickly and the upper surface of the specimen S protrudes, the wear-resistant material 5 will concentrate and collide with the corners and sides of the specimen S, making it impossible to conduct a good test.

[0125] With such a configuration, in such a wear test method, the specimen S collected by the core boring method may be arranged on the bottom surface of the storage tank 2. Note that the bottom surface of the storage tank 2 means the bottom surface of the circular passage P composed of the outer cylindrical body 22 and the inner core body 23.

[0126] In this way, by arranging the specimen S collected by the core boring method on the bottom surface of the storage tank 2, it is possible to simultaneously conduct tests on the specimen S collected by the core boring method under exactly the same conditions. Therefore, in addition to the effect that a predetermined wear mode can be reproduced by a short-time test, it becomes possible to easily compare each specimen S.

[0127] Finally, in the wear test apparatus 1, although the liquid W is stored in the storage tank 2, for example, an oil material with adjusted viscosity may be used. Further, although the wear-resistant material 5 is formed of a general structural rolled steel material (SS material), for example, a gray cast iron material (FC material), a spheroidal graphite cast iron material (FCM material), a stainless steel material (SUS material), or the like may be used. Furthermore, a stone material or the like may be used. Even when these are used as the wear-resistant material 5, it is preferably a prismatic body.

Description of Symbols

[0128] 1…Wear test device 2…Storage tank 3…Rotating plate drive unit 4…Circumferential fixing part 5…Wear consumable 6…Insertion fixing part 22…Outer cylinder 23…Inner core 32…Rotating arm 33…Support shaft 34…Rotating plate C…Central axis P…Circular passage S…Specimen W…Liquid Ws…Liquid level

Claims

1. A wear test method in which a specimen is fixed to the bottom surface of a storage tank to store a liquid, and a wear-resistant material formed in a polyhedral shape having higher toughness than the specimen is put between an outer cylinder constituting the storage tank and an inner core coaxially arranged with the central axis of the outer cylinder, a rotating plate is rotated along a circular passage formed by the outer cylinder and the inner core, and the wear-resistant material is agitated above the specimen. The wear test method.

2. The inner diameter of the outer cylinder is 0.7 to 1.3 m, the weight of the wear-resistant material is 50.0 to 130.0 g, and the rotating plate is rotated at a speed of 50.0 to 90.0 rpm. The wear test method according to Claim 1.

3. The weight of the wear-resistant material is 50.0 to 130.0 g, the maximum rotation radius of the rotating plate is 0.35 to 0.55 m, and the rotating plate is rotated at a speed of 1.5 to 5.5 m / s at the outer peripheral side edge of the rotating plate. The wear test method according to Claim 1.

4. Two or more types of wear-resistant materials are included, at least one of which is different in shape and weight. The wear test method according to Claim 1.

5. The inner diameter of the outer cylinder is 0.7 to 1.3 m, the weight of one wear-resistant material is 50.0 to 90.0 g, the weight of the other wear-resistant material is 90.0 to 130.0 g, and the rotating plate is rotated at a speed of 50.0 to 90.0 rpm. The wear test method according to Claim 4.

6. The weight of one wear-resistant material is 50.0 to 90.0 g, the weight of the other wear-resistant material is 90.0 to 130.0 g, the maximum rotation radius of the rotating plate is 0.35 to 0.55 m, and the rotating plate is rotated at a speed of 1.5 to 5.5 m / s at the outer peripheral side edge of the rotating plate. The wear test method according to Claim 4.

7. The wear-resistant material is a prism. The wear test method according to any one of Claims 1 to 6.

8. The rotating plate is rotated in a state where the distance from the outer peripheral surface of the inner core to the inner peripheral side edge of the rotating plate is shorter than the distance from the inner peripheral surface of the outer cylinder to the outer peripheral side edge of the rotating plate. The wear test method according to any one of Claims 1 to 7.

9. The rotating plate is rotated in a state where the distance from the upper surface of the specimen to the lower side edge of the rotating plate is shorter than the distance from the liquid surface of the liquid to the upper side edge of the rotating plate. The wear test method according to any one of Claims 1 to 8.

10. Rotate the rotating plate while adjusting either one or both of the liquid storage amount and the area of the rotating plate so that the ratio of the cross-sectional area of the liquid in the circular passage to the area of the rotating plate falls within the range of 2.81 to 9.

82. The wear test method according to any one of claims 1 to 9.

11. Arrange the specimens of different types on the bottom surface of the storage tank side by side in the circumferential direction. The wear test method according to any one of claims 1 to 10.

12. Place the specimen collected by the core boring method on the bottom surface of the storage tank. The wear test method according to any one of claims 1 to 11.

13. The specimen is a concrete molded product containing coarse aggregate. The wear test method according to any one of claims 1 to 12.

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