Wear test device

Abstract

To provide a wear test device that can reproduce a predetermined wear mode through a short-time test.SOLUTION: A wear test device 1 comprises: a storage tank 2 that fixes test pieces S to a bottom face and stores water W; wear materials 5 that are introduced to the inside of the storage tank 2 and located on the top of the test pieces S; and rotating plates 34 that are arranged inside the storage tank 2 and located above the wear materials 5, and the wear test device rotates the rotating plates 34 in a circumferential direction of the storage tank 2 to stir the wear materials 5 together with the water W. In such a wear test device 1, an inner core body 23 coaxial with the central axis C of an outer cylindrical body 22 forming the storage tank 2 is provided at the center of the outer cylindrical body 22, and the rotating plates 34 rotate along a circular passage P formed by the outer cylindrical body 22 and the inner core body 23.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In water conservancy facilities 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 the coarse aggregate falls off, the mortar part is further scraped off.

[0003] By the way, there is a wear test apparatus for wearing a concrete molded product as a specimen. The test apparatus disclosed in Non-Patent Document 1 fixes the specimen to the bottom surface of the storage tank and stirs the wear material together with the stored water by rotating the rotating blade. However, according to such a test apparatus, since spherical wear materials roll on the specimen at high speed, the mortar part and the coarse aggregate are worn at the same time, 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 apparatus disclosed in Non-Patent Document 2 fixes the specimen to the inner peripheral surface of the rotating body and lifts and drops the wear material by rotating the rotating body. However, according to such a test apparatus, since a cylindrical wear material is collided with the specimen and a large impact force is repeatedly applied, the falling 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 apparatus disclosed in Non-Patent Document 1, there is also a problem that a long-term test is required.

[0005] Furthermore, the test apparatus disclosed in Non-Patent Document 3 fixes a specimen to the outer peripheral surface of a rotating cylinder and sprays silica sand together with water while rotating this rotating cylinder. However, according to such a test apparatus, since no large impact force is applied to the specimen by simply spraying 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 apparatus 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 an abrasion test apparatus capable of reproducing a predetermined abrasion mode by a short-time test.

Means for Solving the Problems

[0008] This invention relates to a wear test apparatus comprising a storage tank for fixing a specimen on the bottom surface and storing a liquid, an abrasive material that is placed inside the storage tank and located above the specimen, and a rotating plate that is disposed inside the storage tank and located above the abrasive material. By rotating the rotating plate in the circumferential direction of the storage tank, the abrasive material is stirred together with the liquid. In this wear test apparatus, an inner core body that is coaxial with the central axis of the outer cylinder body is provided at the center of the outer cylinder body that constitutes the storage tank, and the rotating plate rotates along a circular passage formed by the outer cylinder body and the inner core body.

[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, the flow velocity is lower at the radially inner position than at the radially outer position. Since an inner core body that is coaxial with the central axis of the outer cylinder body is provided at the center of the outer cylinder body, it is possible to prevent the abrasive material from staying in the central portion. Further, since the rotating plate rotates along a circular passage formed by the outer cylinder body and the inner core body, it is possible to stir the liquid without disturbing the liquid flow. Therefore, it is possible to balance the force that causes the abrasive material to move toward the central portion where the flow velocity is low and the centrifugal force acting on the abrasive material, and thus appropriately wear the surface of the specimen widely and deeply. Accordingly, a predetermined wear mode can be reproduced by a short-time test.

[0010] As an aspect of this invention, a support shaft for supporting the rotating plate and a rotating arm that rotates about the central axis while holding the support shaft are provided, and the rotating arm may rotate at a position higher than the liquid level of the liquid.

[0011] According to this invention, since the rotating arm rotates at a position higher than the liquid level of the liquid, it is possible to stir the liquid without disturbing the liquid flow. Therefore, it is possible to balance the force that causes the abrasive material to move toward the central portion where the flow velocity is low and the centrifugal force acting on the abrasive material, and thus appropriately wear the surface of the specimen widely and deeply. Accordingly, a predetermined wear mode can be reproduced by a short-time test.

[0012] As another aspect of the present invention, the support shaft may be fixed to the inner peripheral side end of the rotating plate and rotate at a position close to the inner core body. Note that the position close to the inner core body means at least inside the intermediate position in the width direction in the circular passage.

[0013] According to the present invention, since the support shaft is fixed to the inner peripheral side end of the rotating plate and rotates at a position close to the inner core body, the support shaft rotates in the central region where the liquid level is low and the flow rate is low, and it is possible to stir without disturbing the liquid flow. Therefore, it is possible to balance the force that the wear material tends to move to the central portion where the flow rate is low and the centrifugal force acting on the wear material, and thus it is possible to appropriately and deeply wear the surface of the test specimen widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0014] As another aspect of the present invention, the inner core body may protrude upward from the liquid surface of the liquid at least in a state where the rotating plate is rotating. Note that the state where the rotating plate is rotating means a state where a test is being performed by stirring the wear material together with the liquid.

[0015] According to the present invention, since the inner core body protrudes upward from the liquid surface of the liquid at least when the rotating plate is rotating, a circular passage that is a closed passage is formed up to the liquid surface of the liquid, and it is possible to stir without disturbing the liquid flow. Therefore, it is possible to balance the force that the wear material tends to move to the central portion where the flow rate is low and the centrifugal force acting on the wear material, and thus it is possible to appropriately and deeply wear the surface of the test specimen widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0016] As another aspect of the present invention, the distance from the outer peripheral surface of the inner core body to the inner peripheral side edge of the rotating plate may be shorter than the distance from the inner peripheral surface of the outer cylinder to the outer peripheral side edge of the rotating plate. Note that the minimum value of the distance from the outer peripheral surface of the inner core body to the inner peripheral side edge of the rotating plate is determined based on the shape of the wear material.

[0017] According to the present invention, since 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 the wear material due to the decrease in the flow velocity in the vicinity of the inner core body, and thus it is possible to appropriately widely and deeply wear the surface of the test specimen. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0018] Also, as an aspect of the present invention, the distance from the upper surface of the test specimen to the lower side edge of the rotating plate may be shorter than the distance from the liquid surface of the liquid to the upper side edge of the rotating plate. Note that the minimum value of the distance from the upper surface of the test specimen to the lower side edge of the rotating plate is determined based on the shape of the wear material.

[0019] According to the present invention, since 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 the wear material due to the decrease in the flow velocity in the vicinity of the test specimen, and thus it is possible to appropriately widely and deeply wear the surface of the test specimen. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0020] Also, as an aspect of the present invention, the wear material may be a polyhedron formation formed of a material having higher toughness than the test specimen. Note that the polyhedron formation means a three-dimensional formation formed by a plurality of surfaces. It includes not only pyramids and prisms but also cones and cylinders.

[0021] According to the present invention, since the wear material is a polyhedron formation formed of a material having higher toughness than the test specimen, it is possible to repeatedly apply an impact force to the surface of the test specimen, and thus it is possible to appropriately widely and deeply wear the surface of the test specimen. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0022] As an aspect of the present invention, the friction material may include two or more types that differ in at least one of shape and weight. Note that "differing in at least one of shape and weight" means that in addition to those with different shapes, even if the shapes are the same, those with different weights due to material differences are applicable. Of course, those with different shapes and weights are also applicable.

[0023] According to the present invention, since the friction material includes two or more types that differ in at least one of shape and weight, it is possible to repeatedly apply impact forces of different magnitudes to the surface of the specimen, and thus appropriately wear the surface of the specimen widely and deeply. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0024] As an aspect of the present invention, the inner diameter of the outer cylindrical body may be 0.7 to 1.3 m, the weight of the friction 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. Even if two or more types of friction materials are included, the weight of each friction material falls within the range of 50.0 to 130.0 g.

[0025] According to the present invention, since the inner diameter of the outer cylindrical body is 0.7 to 1.3 m, the weight of the friction material is 50.0 to 130.0 g, and the rotating plate is rotated at a speed of 50.0 to 90.0 rpm, it is possible to surely balance the force for the friction material to move to the central portion with a low flow velocity and the centrifugal force acting on the friction material. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0026] As an aspect of the present invention, the ratio of the inner diameter of the outer cylindrical body to the outer diameter of the inner core body may be 1.67 to 4.06. Note that the inner diameter of the outer cylindrical body is calculated to fall within the range of 0.7 to 1.3 m, and the outer diameter of the inner core body is calculated to fall within the range of 0.32 m to 0.42 m.

[0027] According to the present invention, since the ratio of the inner diameter of the outer cylindrical body to the outer diameter of the inner core body is set to 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, the force that the wear material tries to move to the central portion where the flow velocity is low and the centrifugal force acting on the wear material can be surely balanced. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0028] As another aspect of the present invention, the ratio of the cross-sectional area of the liquid in the circular passage to the area of the rotating plate may be set to 2.81 to 9.82. Note that the inner diameter of the outer cylindrical body is within the range of 0.7 to 1.3 m, the outer diameter of the inner core body is within the range of 0.32 m to 0.42 m, and the height of the liquid level and the area of the rotating plate are calculated with predetermined values.

[0029] According to the present invention, since the ratio of the cross-sectional area of the liquid in the circular passage to the area of the rotating plate is set to 2.81 to 9.82, it is possible to prevent the retention of the wear 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, a test specimen fixing portion (circumferential fixing portion) for fixing the flat test specimens in a state of being arranged in the circumferential direction may be provided on the bottom surface of the storage tank. Note that such a circumferential fixing portion may be provided for each test specimen or for a plurality of test specimens.

[0031] According to the present invention, since the circumferential fixing portion for fixing the flat test specimens in a state of being arranged in the circumferential direction is provided on the bottom surface of the storage tank, tests can be performed simultaneously under the same conditions for various types of test specimens. 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 an aspect of the present invention, a specimen fixing part (insertion fixing part) for fixing the cylindrical specimen in a state of being inserted into the bottom surface of the storage tank may be provided. Note that such an insertion fixing part may be provided for each specimen or for a plurality of specimens.

[0033] According to the present invention, since an insertion fixing part for fixing the cylindrical specimen in a state of being inserted into the bottom surface of the storage tank is provided, for example, tests can be simultaneously performed on specimens collected by the core boring method under 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.

[0034] As an aspect of the present invention, the specimen may be 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 part, and its type, density, etc. are not limited. Also, it is possible to test mortar formations that do not contain coarse aggregate.

[0035] According to the present invention, since the specimen is a concrete molded product containing coarse aggregate, a wear mode in which the mortar part is scraped off and the coarse aggregate is exposed, and further the mortar part is scraped off when the coarse aggregate falls out, can be reproduced. 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 with reference to 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 a situation where the inner core body 23 is being detached. FIG. 3 is a side view showing the configuration of the rotating plate driving unit 3, FIG. 4 is an explanatory diagram showing a situation where the radial position of the rotating plate 34 is being adjusted, FIG. 5 is an explanatory diagram showing a situation where the vertical position of the rotating plate 34 is being adjusted, FIG. 6 is an explanatory diagram showing a situation where the inclination angle α of the rotating plate 34 with respect to the velocity direction V is being adjusted. And FIG. 7 is an explanatory diagram showing a situation where the inclination angle β of the rotating plate 34 with respect to the centrifugal direction R is being adjusted.

[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 abrasion material 51 and the second abrasion material 52. FIG. 12 is an explanatory view showing the relationship between the type of the abrasion material 5 and the scar on the resin plate, FIG. 13 is an explanatory view showing the relationship between the combination of the abrasion 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 abrasion 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 abrasion 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 abrasion 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 abrasion test apparatus 1 uses an abrasion material 5. The abrasion material 5 is not a component directly attached to the abrasion test apparatus 1 but is indispensable for abrading the specimen S. Therefore, the abrasion 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 coaxially disposed 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. On the upper surface of the bottom plate 21, a support base 211 for supporting the inner core body 23 is provided. The support base 211 is formed in an annular shape around the central axis C, and the specimen S is disposed so as to surround the support base 211. Further, on the lower surface of the bottom plate 21, H-shaped steels 212 combined in a lattice pattern are fixed. Casters 213 used during movement are attached to the H-shaped steels 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 while 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 described later is bridged over this 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 while 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 (including polygons that are substantially circular when viewed from above) 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. And 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 cylinder 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, it is possible to freely adjust or constantly maintain the driving state (rotation speed of the rotating shaft 31S) of the electric motor 31. 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 columnar 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 cylinder 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. Also, it is 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 columnar 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 abrasion test apparatus 1, since one support shaft 33 is held for each rotating arm 32, two support shafts 33 are arranged every 180 degrees, but 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] Also, the rotating plate 34 of the abrasion 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 small. Therefore, it is possible to stir the liquid W without disturbing its flow.

[0052] Furthermore, even when the rotary plate 34 is not rotating, the inner core body 23 of the wear test apparatus 1 protrudes upward from the liquid level Ws of the liquid W. However, when the rotary 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 rotary plate 34, the inner core body 23 may be configured to protrude upward from the liquid level Ws. Even with such a configuration, in a state where the rotary plate 34 is rotating, that is, in a state where the test is being conducted, 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 wear test apparatus 1 can adjust the radial position of the rotary plate 34. As shown in FIG. 4, the shaft holding portion 321 is configured to grip the rotary arm 32 by the upper piece 32a and the lower piece 32b of the main body portion. By loosening the bolt 322 that tightens them, the shaft holding portion 321 can be moved in the axial direction of the rotary 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 rotary 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 rotary plate 34 attached to the support shaft 33 also moves in the radially inner direction. Thus, in the wear test apparatus 1, the radial position of the rotary plate 34 can be adjusted.

[0055] In addition, the wear test apparatus 1 can also adjust the vertical position of the rotary 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 the front surface thereof. By loosening the bolt 323 that tightens them, the support shaft 33 can be moved perpendicular to the axial direction of the rotary 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 will also move upward. Conversely, when the support shaft 33 is moved downward, the rotating plate 34 attached to the support shaft 33 will also move 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 will also rotate clockwise, and the rotating plate 34 attached to the support shaft 33 will also rotate 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 will also rotate counterclockwise, and the rotating plate 34 attached to the support shaft 33 will also rotate 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 direction outside the diameter 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 abrasion 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 portion 4> As shown in FIG. 8, the circumferential direction fixing portion 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 portion 4 includes an outer peripheral side fixture 41 that fixes the outer peripheral side end portion of the specimen S and an inner peripheral side fixture 42 that fixes the inner peripheral side end portion of the specimen S. Further, the circumferential direction fixing portion 4 includes an elastic tube 43 in order to mitigate the impact force caused by the collision of the abrasion material 5.

[0062] The outer peripheral side fixture 41 is an L-shaped steel bent in an arc shape so as to follow the inner peripheral surface of the outer cylinder body 22. The outer peripheral 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 on the upper surface of the outer peripheral side end portion of the specimen S, and the elastic tube 43 is positioned on the upper surface of this horizontal plate 412.

[0063] The inner peripheral side fixture 42 is an L-shaped steel bent in an arc shape so as to follow the outer peripheral surface of the inner core body 23. The inner peripheral 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 on the upper surface of the inner peripheral side end portion 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 peripheral side fixture 41 and the inner peripheral side fixture 42. That is, as shown in Fig. 9(a), after inserting the outer peripheral side fixture 41 and the inner peripheral 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 peripheral side fixture 41 can be moved toward the inner peripheral 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 peripheral side fixture 41 and the inner peripheral 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 perform tests on five types of specimens S simultaneously under 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 the present 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 put inside the storage tank 2 and placed on the upper part of the specimen S fixed to the bottom surface (see Fig. 1).

[0067] The first friction consumable 51 is a metal formation formed in a quadrangular prism shape. In this embodiment, the longitudinal dimension x and the lateral 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, it is only necessary that the force for the first friction consumable 51 to move to the central portion with a low flow velocity 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, so it is not limited as a strict value.

[0068] Therefore, regarding the shape of the first friction consumable 51, it is only limited to be simply a prism shape, and regarding its weight, it is limited to fall within the range of 50.0 to 90.0 g. The first friction consumable 51 is made smaller (lighter) than the second friction consumable 52 described later in consideration 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 longitudinal dimension x and the lateral 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, it is only necessary that the force for the second friction consumable 52 to move to the central portion with a low flow velocity 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, so it is not limited as a strict value.

[0070] Therefore, regarding the shape of the second friction consumable 52, it is only limited to be simply a prism shape, and regarding its weight, it is limited to fall within the range of 90.0 to 130.0 g. The second friction consumable 52 is made larger (heavier) than the first friction consumable 51 described above in consideration 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 the stickiness of the material) than the specimen S which is a concrete formation. Also, when conducting tests using two types of wear materials 5, a plurality of each of the first wear material 51 and the second wear material 52 are put in. However, the number of the first wear material 51 and the second wear material 52 put in should be optimized considering the width and depth of the worn portion in the specimen S, the time required for the test, etc., and thus is not limited to a strict value.

[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 rotational 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 the ratio of the cross-sectional area of the liquid W in the circular passage P to the area of the rotating plate 34 is 6.87.

[0074] Note that the inner diameter of the outer cylinder 22 may be set 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 therefrom. It has been confirmed that even if the rotational 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 respective friction materials 5 do not stay at the central portion 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 set to be 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 set to be 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 friction material 52, are used. This is to prevent the first friction material 51 and the second friction 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. Regarding the maximum rotation radius of such a rotating plate 34, it is sufficient that it ultimately falls within the range of 0.35 to 0.55 m. 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, with a slight margin taken from this. It has been confirmed that if the maximum rotation radius of the rotating plate 34 is at least within 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 explained. 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. All of these candidates are formed of general structural rolled steel, 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 one by one, and the behavior of the wear materials sinking 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 materials No. 1 to 5, the rotary plate 34 rolls while vertically and horizontally rotating at a rotational speed of around 70 rpm. For the wear material No. 6, although it rolls at all rotational speeds because it is spherical, 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 material No. 6, the rotational speed of the rotary plate 34 was set to 50 to 90 rpm.

[0082] Next, the reasons for determining the shape of the wear material 5 will be described. When determining the shape of the wear material, about 20 pieces of each of the candidate wear materials were put in one by one, and with the rotational speed of the rotary 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 material 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 material 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 material No. 5, the shape of the wear material 5 was determined to be a prismatic shape.

[0085] Next, the reasons for selecting the short prism (first wear material 51) and the prism (second wear material 52) as the wear material 5 will be described. As described above, for the liquid W rotating in the storage tank 2, the flow velocity is lower 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 where the flow velocity is low 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 other wear materials were combined and put in, and with the rotation speed of the rotary 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 was 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 was also 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 was also large. Therefore, as the wear material 5, the short prismatic body (first wear material 51), which is the No. 4 wear material, and the 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 rotary 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 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 the same conditions.

[0090] As shown in Table 5 below, for the five types of specimens S, No. 1 to No. 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 wear 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 wear 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 wear region is a smooth curved surface, and it can be seen that the wear mode is different from that of the specimen S of No. 2. This is considered to be because in addition to the high wear rate of the mortar and the absence of coarse aggregates, once a groove is formed, the wear 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, the wear test apparatus 1 includes a storage tank 2 that fixes the specimen S on the bottom surface and stores the liquid W, a wear material 5 that is put into the storage tank 2 and located above the specimen S, and a rotating plate 34 that is arranged inside the storage tank 2 and located above the wear material 5. By rotating the rotating plate 34 in the circumferential direction of the storage tank 2, the wear material 5 is stirred together with the liquid W. In such a wear test apparatus 1, an inner core body 23 coaxial with the central axis C of the outer cylinder body 22 is provided at the center of the outer cylinder body 22 constituting the storage tank 2, and the rotating plate 34 rotates along a circular passage P formed by the outer cylinder body 22 and the inner core body 23.

[0095] According to such a wear test apparatus 1, 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 an inner core body 23 coaxial with the central axis C of the outer cylinder body 22 is provided at the center of the outer cylinder body 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 body 22 and the inner core body 23, it can be stirred without disturbing the flow of the liquid W. Therefore, the force that the wear material 5 tries to move to the central part with a low flow velocity and the centrifugal force acting on the wear material 5 can be balanced, 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 the wear test apparatus 1, a support shaft 33 that supports the rotating plate 34 and a rotating arm 32 that rotates about the central axis C while holding the support shaft 33 are provided. The rotating arm 32 rotates at a position higher than the liquid surface Ws of the liquid W.

[0097] According to such a wear test apparatus 1, since the rotating arm 32 rotates at a position higher than the liquid surface Ws of the liquid W, it is possible to stir without disturbing the flow of the liquid W. Therefore, it is possible to balance the force that causes the wear material 5 to move toward the central portion where the flow velocity is low and the centrifugal force acting on the wear material 5, and thus it is possible to appropriately and deeply wear the surface of the test specimen S widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0098] In the wear test apparatus 1, the support shaft 33 is fixed to the inner peripheral side end of the rotating plate 34 and rotates at a position close to the inner core body 23. The position close to the inner core body 23 means at least inside the intermediate position in the width direction in the circular passage P.

[0099] According to such a wear test apparatus 1, since the support shaft 33 is fixed to the inner peripheral side end of the rotating plate 34 and rotates at a position close to the inner core body 23, the support shaft rotates in the central region where the liquid level is low and the flow velocity is low, and it is possible to stir without disturbing the flow of the liquid W. Therefore, it is possible to balance the force that causes the wear material 5 to move toward the central portion where the flow velocity is low and the centrifugal force acting on the wear material 5, and thus it is possible to appropriately and deeply wear the surface of the test specimen S widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0100] In the wear test apparatus 1, the inner core body 23 projects upward from the liquid surface Ws of the liquid W at least when the rotating plate 34 is rotating. The state where the rotating plate 34 is rotating means a state in which the wear material 5 is stirred together with the liquid W to conduct a test.

[0101] According to such a wear test apparatus 1, since the inner core body 23 protrudes upward from the liquid surface Ws of the liquid W at least when the rotating plate 34 is rotating, a circular passage P, which is a closed passage, is formed up to the liquid surface of the liquid W, and it is possible to stir without disturbing the flow of the liquid W. Therefore, it is possible to balance the force that causes the wear material 5 to move toward the central portion where the flow velocity is low and the centrifugal force acting on the wear material 5, and thus it is possible to appropriately and deeply wear the surface of the test specimen S widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0102] Also, in the wear test apparatus 1, the distance D1 from the outer peripheral surface of the inner core body 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 body 22 to the outer peripheral side edge of the rotating plate 34. Note that the minimum value of the distance D1 from the outer peripheral surface of the inner core body 23 to the inner peripheral side edge of the rotating plate 34 is determined based on the shape of the wear material 5.

[0103] According to such a wear test apparatus 1, since the distance D1 from the outer peripheral surface of the inner core body 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 body 22 to the outer peripheral side edge of the rotating plate 34, it is possible to prevent the retention of the wear material 5 due to the decrease in the flow velocity in the vicinity of the inner core body 23, and thus it is possible to appropriately and deeply wear the surface of the test specimen S widely. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0104] Also, in the wear test apparatus 1, 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. Note that the minimum value of the distance D3 from the upper surface of the test specimen S to the lower side edge of the rotating plate 34 is determined based on the shape of the wear material 5.

[0105] According to such a wear test apparatus 1, since the distance D3 from the upper surface of the specimen S to the lower edge of the rotating plate 34 is shorter than the distance D4 from the liquid surface Ws of the liquid W to the upper edge of the rotating plate 34, it is possible to prevent the retention of the wear material 5 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.

[0106] Further, in the wear test apparatus 1, the wear material 5 is a polyhedron formed of a material having higher toughness than the specimen S. The polyhedron means a three-dimensional formation formed by a plurality of surfaces and includes not only a pyramid or a prism but also a cone or a cylinder.

[0107] According to such a wear test apparatus 1, since the wear material 5 is a polyhedron formed of a material having higher toughness than the specimen S, it is possible to repeatedly apply an impact force to the surface 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 the wear test apparatus 1, the wear material 5 includes two or more types (the first wear material 51 and the second wear material 52) having at least one of different shapes and weights. Note that at least one of different shapes and weights means that in addition to those with different shapes, even if the shapes are the same, those with different weights due to material differences are applicable. Of course, those with both different shapes and weights are also applicable.

[0109] According to such a wear test apparatus 1, since the wear material 5 includes two or more types (the first wear material 51 and the second wear material 52) 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 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.

[0110] In the wear test apparatus 1, the inner diameter of the outer cylindrical body 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. Even if two or more types (first wear material 51 and second wear material 52) are included as the wear material 5, the weight of each wear material 5 (51, 52) falls within the range of 50.0 to 130.0 g.

[0111] According to such a wear test apparatus 1, since the inner diameter of the outer cylindrical body 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, it is possible to surely balance the force that the wear material 5 tries to move to the central portion where the flow velocity is low and the centrifugal force acting on the wear material 5. Therefore, a predetermined wear mode can be reproduced by a short-time test.

[0112] In the wear test apparatus 1, the ratio of the inner diameter of the outer cylindrical body 22 to the outer diameter of the inner core body 23 is set to 1.67 to 4.06. The inner diameter of the outer cylindrical body 22 is within the range of 0.7 to 1.3 m, and the outer diameter of the inner core body 23 is calculated to be within the range of 0.32 m to 0.42 m.

[0113] According to such a wear test apparatus 1, since the ratio of the inner diameter of the outer cylindrical body 22 to the outer diameter of the inner core body 23 is set to 1.67 to 4.06, an appropriate gradient can be given to the flow velocity distribution in the radial direction of the storage tank 2, and thus the force that the wear material 5 tries to move to the central portion where the flow velocity is low 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.

[0114] In the wear test apparatus 1, the ratio of the cross-sectional area of the liquid W in the circular passage P to the area of the rotating plate 34 is set to 2.81 to 9.82. The inner diameter of the outer cylindrical body 22 is within the range of 0.7 to 1.3 m, and the outer diameter of the inner core body 23 is within the range of 0.32 m to 0.42 m. The height of the liquid surface Ws and the area of the rotating plate 34 are calculated with predetermined values.

[0115] According to such a wear test apparatus 1, since the ratio of the cross-sectional area of the liquid W in the circular passage P to the area of the rotary plate 34 is set to 2.81 to 9.82, it is possible to prevent the retention of the wear material 5 due to the decrease in the flow velocity at a position separated from the rotary plate 34. 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.

[0116] In addition, in the wear test apparatus 1, a specimen fixing portion (circumferential fixing portion 4) for fixing the flat specimens S in a state of being arranged in the circumferential direction is provided on the bottom surface of the storage tank 2. Note that the circumferential fixing portion 4 may be provided for each specimen S or for a plurality of specimens S.

[0117] According to such a wear test apparatus 1, since the circumferential fixing portion 4 for fixing the flat specimens S in a state of being arranged in the circumferential direction is provided on the bottom surface of the storage tank 2, tests can be performed simultaneously under the same conditions for various types of specimens S. 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.

[0118] In addition, in the wear test apparatus 1, the specimen S is a concrete molded product containing coarse aggregate. 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 or the like that do not contain coarse aggregate.

[0119] According to such a wear test apparatus 1, since the specimen S is a concrete molded product containing coarse aggregate, a wear mode in which the mortar portion is scraped off and the coarse aggregate is exposed, and when this coarse aggregate falls out, the mortar portion is further scraped off can be reproduced. That is, selective wear in which the mortar portion is selectively scraped off can be reproduced.

[0120] 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 storage tank 2, The rotating plate drive unit corresponds to rotating plate drive unit 3, The circumferential fixing part corresponds to circumferential fixing part 4, The wearing consumable corresponds to wearing consumable 5 (first wearing consumable 51 and second wearing consumable 52), The insertion fixing part corresponds to insertion fixing part 6, corresponds to outer cylinder 22, corresponds to inner core 23, corresponds to rotating arm 32, corresponds to support shaft 33, corresponds to rotating plate 34, corresponds to central axis C, The circular passage corresponds to circular passage P, The specimen corresponds to specimen S, The liquid corresponds to liquid W, The liquid level corresponds to liquid level Ws. However, the present invention is not limited to the configuration of the foregoing embodiment, and many embodiments can be obtained.

[0121] For example, in the wear test apparatus 1, a specimen fixing part (insertion fixing part 6) may be provided to fix the cylindrical specimen S in a state of being inserted into the bottom surface of the storage tank 2. 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 part 6 for fixing the cylindrical specimen S in a state of being inserted into the insertion hole 6h may be provided.

[0122] In this case, an adjustment table 61 may be provided to adjust the height of the upper surface of the specimen S and its periphery. 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 at least higher wear resistance than the specimen S. If the wear of the adjustment table 61 progresses quickly and the upper surface of the specimen S protrudes, the wearing consumable 5 will concentrate and collide with the corners and sides of the specimen S, and a good test cannot be performed.

[0123] Thus, in the wear test apparatus 1, a specimen fixing part (insertion fixing part 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. Note that the insertion fixing part 6 may be provided for each specimen S or for a plurality of specimens S.

[0124] According to such a wear test apparatus 1, since the insertion fixing part 6 for fixing the cylindrical specimen S in a state of being inserted into the bottom surface of the storage tank 2 is provided, for example, tests can be simultaneously performed on the specimen S collected by the core boring method under 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.

[0125] 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 or the like may be used. Further, although the wear 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 material 5, it is preferably a prismatic body.

Explanation of Reference Numerals

[0126] 1... Wear test apparatus 2... Storage tank 3... Rotating plate drive part 4... Circumferential fixing part 5... Wear material 6... Insertion fixing part 6h... Insertion hole 22... Outer cylinder 23... Inner core body 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 storage tank that fixes a specimen on the bottom surface and stores a liquid, An abrasive material that is put inside the storage tank and located above the specimen, A rotating plate that is arranged inside the storage tank and located above the abrasive material, and In a wear test device that stirs the abrasive material together with the liquid by rotating the rotating plate in the circumferential direction of the storage tank, An inner core body that is coaxial with the central axis of the outer cylindrical body is provided at the center of the outer cylindrical body that constitutes the storage tank, The rotating plate rotates along a circular passage formed by the outer cylindrical body and the inner core body Wear test device.

2. A support shaft that supports the rotating plate, and A rotating arm that rotates around the central axis while holding the support shaft, and The rotating arm rotates at a position higher than the liquid level of the liquid The wear test device according to claim 1.

3. The support shaft is fixed to the inner circumferential side end of the rotating plate and rotates at a position close to the inner core body The wear test device according to claim 2.

4. The inner core body protrudes upward from the liquid level of the liquid at least when the rotating plate is rotating The wear test device according to any one of claims 1 to 3.

5. The distance from the outer peripheral surface of the inner core body to the inner circumferential side edge of the rotating plate is shorter than the distance from the inner circumferential surface of the outer cylindrical body to the outer circumferential side edge of the rotating plate The wear test device according to any one of claims 1 to 4.

6. 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 level of the liquid to the upper side edge of the rotating plate The wear test device according to any one of claims 1 to 5.

7. The ratio of the inner diameter of the outer cylindrical body to the outer diameter of the inner core body is set to 1.67 to 4.06 The wear test device according to any one of claims 1 to 6.

8. A specimen fixing part is provided on the bottom surface of the storage tank to fix the flat specimens side by side in the circumferential direction The wear test device according to any one of claims 1 to 7.

9. A specimen fixing part is provided on the bottom surface of the storage tank to fix the cylindrical specimens in an inserted state The wear test device according to any one of claims 1 to 8.

Images