JP4665060B1 - Load fluctuation mechanism and grindstone bond degree test apparatus using the same - Google Patents

Abstract

A load variation mechanism capable of varying a load applied to a subject with a simple structure and a grindstone bond degree test apparatus using the load variation mechanism.
A weight support body 10 that can be moved up and down, and a plurality of weights 22 to 29 that are spaced apart from each other in the vertical direction and are supported by the weight support body while being restricted from moving in a vertically downward direction. The weight support 10 descends toward the subject 101 disposed below the weight, and the weight 22 located at the lowest position contacts the subject 101 directly or indirectly and the load on the weight 22 located at the lowest position. In addition to the subject 101, the weight support 10 further descends, and the weights 22 to 29 that have been sequentially separated from below contact each other to increase the load applied to the subject 101.
[Selection] Figure 11

Description

  The present invention relates to a load variation mechanism and a grindstone bond degree test apparatus using the same.

  In the Ogoshi type grindstone bond degree test that measures the degree of bond of the grindstone, a bit is brought into contact with the grindstone, and a predetermined load is applied to the bit, the bit is rotated by a predetermined angle, and the biting depth is measured. Has been done. In the Ogoshi-type grindstone bond degree test, the load applied to the grindstone varies depending on the type of grindstone that is the subject. For this reason, a grindstone bond degree testing apparatus that can change the load to be applied and can cope with various test methods is desired.

  Further, a compression load test, a bending test, and the like are performed in order to measure mechanical strength such as compressive strength and bending strength of various samples. In the compressive load or bending test, a large load is gradually applied to the sample, and the load applied when the sample is broken or bent is measured.

  In such a test apparatus, an apparatus including a mechanism capable of changing a load applied to a sample is disclosed (for example, Patent Document 1 and Patent Document 2).

  The load tester disclosed in Patent Document 1 is a device in which a plurality of load weights are arranged in a vertical direction on a weight support frame, and the load weights are arranged by detachable pins or the like.

  The load / load switching device disclosed in Patent Document 2 includes a plurality of latching step portions in which a plurality of weight rings having different weights are placed concentrically at a certain interval in order from lighter to lower. A holding piece, a guide tube that passes through the central portion of the weight ring held by each latching step portion, and the upper portion is suspended from the end of the load carrying lever of the testing machine, and the lowermost weight ring. It is composed of a weight retaining ring that is loosely fitted and held on the outer periphery of the guide cylinder so as to be raised or lowered by an electric motor. When the weight retaining ring is raised by the rotation of the electric motor, the upper weight ring is sequentially stacked and received by the lowest weight ring.

Registered Utility Model No. 3072735 JP-A-6-194286

  In the apparatus disclosed in Patent Document 1, the load to be applied is changed by artificially detaching the pin, and there is a problem that the operation is troublesome and time is required. Further, since the load variation is artificially manipulated, when the weight of the load weight is large, there is a possibility that a finger is pinched between the load weights.

  In the apparatus disclosed in Patent Document 2, since the weight rings having different horizontal cross sections are provided and the stepped holding pieces are provided, the structure becomes complicated.

  The present invention has been made in view of the above matters, and an object of the present invention is to provide a load variation mechanism capable of varying a load applied to a subject with a simple structure, and a grindstone bond degree test apparatus using the load variation mechanism. There is to do.

The load variation mechanism according to the first aspect of the present invention is:
A weight support that can be raised and lowered;
A plurality of weights that are spaced apart from each other in the vertical direction and are supported by the weight support body in such a manner that movement in the vertically downward direction is restricted.
The weight support has a locking projection for restricting the movement of the weight in the vertically downward direction,
Each of the weights is locked and supported by the locking projections,
The weight is provided with a groove through which the locking projection located above can pass,
The weight can be moved upward relative to the weight support when the weight support is lowered,
The weight support body descends toward the subject disposed below the weight, and the weight located at the lowest position directly or indirectly contacts the subject, and the weight located at the lowest position. Is applied to the subject,
Furthermore, the weight support body is lowered, and the weight applied to the subject fluctuates as the weights that have been sequentially separated from the lower order come into contact with each other.
It is characterized by that.

  Moreover, it is preferable to provide a control device for controlling a descending amount of the weight support and controlling a load applied to the subject.

The grindstone bond degree testing apparatus according to the second aspect of the present invention is:
A weight support that can be raised and lowered;
A plurality of weights that are spaced apart from each other in the vertical direction and are supported by the weight support body, each of which is controlled to move downward in the vertical direction;
A bit attached directly or indirectly to the weight located at the lowest position,
The weight support has a locking projection for restricting the movement of the weight in the vertically downward direction,
Each of the weights is locked and supported by the locking projections,
The weight is provided with a groove through which the locking projection located above can pass,
The weight can be moved upward relative to the weight support when the weight support is lowered,
The weight support is lowered with respect to the grindstone disposed below the weight support, the bit contacts the grindstone, and the weight of the lowest weight is applied to the grindstone,
Further, the weight support is lowered, and the weight applied to the grindstone fluctuates as the weights that have been sequentially separated from the lower order come into contact with each other.
It is characterized by that.

  Moreover, it is preferable to provide a control device for controlling a descending amount of the weight support and controlling a load applied to the subject.

In addition, a rotation drive device for rotating the bit,
The bit is preferably rotated by a predetermined angle after a predetermined amount of load is applied to the grindstone.

  Moreover, it is preferable to provide the control apparatus which rotates the said rotational drive apparatus by a predetermined angle.

  In the load variation mechanism according to the present invention, the weight supported by the weight support is placed in contact with the weight support in order from the lower side only by lowering the weight support toward the subject. In this way, it is possible to vary the load applied to the subject with a simple structure.

It is a side view of a grindstone bond degree testing device. It is a fragmentary sectional view of a grindstone bond degree test device. (A) is a side view which shows the structure of a weight support body, (B) is a front view which shows the structure of the weight support body seen in the outline arrow direction of (A). It is a side view which shows a mode that the weight is each spaced apart and supported by the weight support body. It is a perspective view of the weight supported by the weight support body. It is a fragmentary sectional view explaining operation | movement of a grindstone bond degree test apparatus. It is a fragmentary sectional view explaining operation | movement of a grindstone bond degree test apparatus. It is a fragmentary sectional view explaining operation | movement of a grindstone bond degree test apparatus. (A)-(D) are sectional drawings explaining operation | movement of a grindstone bond degree test apparatus. It is a fragmentary sectional view explaining operation | movement of a grindstone bond degree test apparatus. (A), (B) is a front view explaining operation | movement of a compression test apparatus. (A), (B) is a front view explaining operation | movement of a bending test apparatus.

  Hereinafter, the load variation mechanism will be described using the grindstone bond degree test apparatus as an example.

  First, the structure of the grindstone bond degree testing apparatus 1 will be described with reference to FIGS. As shown in the side view of FIG. 1 and the internal configuration diagram of FIG. 2, the grindstone coupling degree test apparatus 1 includes a weight support body 10, an initial weight 21, weights 22 to 28, a bit driving device 30, From the bit 31, the lower slide base 40, the upper slide base 41, the main shaft base 50, the guide rail 60, the ball screw driving device 70, the ball screw 71, the nut block 72, the nut 73, and the control device 80. Composed.

  As shown in FIGS. 3A and 3B, the weight support 10 includes upper and lower bottom plates 11a and 11b and side plates 12, 13, and 14 connecting the bottom plates 11a and 11b. The side plate 14 of the weight support 10 is connected to the upper slide base 41, and the weight support 10 has a structure that moves up and down following the movement of the upper slide base 41 in the vertical direction. Moreover, the weight support body 10 supports a plurality of weights 22 to 28 included therein so as to restrict movement in the vertically downward direction.

  The initial weight 21 and the weights 22 to 28 are load weights placed on the grindstone 90, respectively. The initial weight 20 has a substantially cylindrical shape. On the other hand, the weights 22 to 28 have a quadrangular prism shape, and the weights 22 to 25 positioned below are partly cut so as not to interfere with the initial weight 21 and the bit driving device 30 disposed inside the weight support 10. It is a missing structure.

  Below the initial weight 21 positioned at the lowest position, a bit 31 that is brought into contact with the grindstone 90 that is the subject is disposed. As will be described later, the initial weight 21 includes a convex portion 21a on which the weight 22 is locked and placed. The initial weight 21 includes a convex portion 21 b that is locked to the stopper 40 a of the lower slide base 40.

  A bit driving device 30 for rotating the bit 31 is disposed above the initial weight 21. The driving of the bit driving device 30 is controlled by the control device 80.

  In the weight support 10, the side plates 12 and 13 that are arranged to face each other, as shown in FIG. 3, the locking projections 12 a to 12 f and the locking projections 13 a to 13 f face the weights 22 to 28, respectively. Is provided to protrude. The bottom surfaces of the corresponding weights 23 to 28 are locked to the locking protrusions 12a to 12f and the locking protrusions 13a to 13f, respectively, and the movement of the weights 23 to 28 in the vertically downward direction is restricted. The locking projections 12a to 12f are provided alternately. The locking projections 13a to 13f are also provided alternately.

  Except for the initial weight 21, the weights 22 to 28 are supported in a state of being separated from the adjacent weights 22 to 28. The initial weight 21 and the weight 22 are also supported in a separated state.

  As shown in FIG. 4, grooves 22 a to 27 a and 22 b to 27 b are provided in the other weights 22 to 27 except for the initial weight 21 positioned at the lowest position and the weight 28 positioned at the highest position. . The grooves 22a to 27a are provided alternately. Similarly, the grooves 22b to 27b are provided alternately. Thereby, when the weights 22 to 27 move relative to the weight support 10 in the upward direction, the locking protrusions 12 a to 12 f formed on the side plates 12 and 13 do not interfere with each other.

  As an example, grooves of weights 26 and 27 arranged adjacent to each other are shown in FIG. The positions of the groove 26a and the groove 27a are shifted in the left-right direction on the paper surface. The same applies to the positions of the grooves 26b and 27b. Thereby, when the weight 26 moves relative to the weight support body 10 in the upward direction, it does not interfere with the locking protrusions 12e and 13e that lock the weight 27.

  The upper slide base 41 is connected along the guide rail 60 so as to be movable up and down. Similarly, the lower slide base 40 is connected along the guide rail 60 so as to be movable up and down.

  The lower slide base 40 and the upper slide base 41 are connected to the nut block 72 via a connecting member (not shown), a connecting belt, a connecting chain, and the like. A nut 73 is included in the nut block 72. The nut 73 is screwed with the ball screw 71. Above the ball screw 71, a ball screw driving device 70 for rotating the ball screw 71 is provided.

  When the ball screw driving device 70 is driven, the ball screw 71 rotates. However, since the nut 73 screwed into the ball screw 71 is restricted from rotating by the nut block 72, the nut 73 does not rotate and follows the ball screw 71. It moves up and down.

  The initial weight 20 is connected to a bit driving device 30 that rotates the bit 31, and the initial weight 20, the bit 31, and the bit driving device 30 are connected to the spindle base 50. The main shaft base 50 is slidably connected to the guide rail 60. The spindle base 50 can move up and down along the guide rail 60.

  The spindle base 50 is located between the lower slide base 40 and the upper slide base 41, and is configured to follow the vertical movement of the initial weight 21 and the like based on the vertical movement of the upper slide base 41 and move up and down. .

  Then, the operation | movement of the grindstone coupling | bonding degree test apparatus 1 is demonstrated in detail, referring FIG. 2 and FIGS.

  First, as shown in FIG. 2, when a grindstone 90 for measurement is placed below the bit 31 and a power source (not shown) is turned on, the driving device 70 rotates and the ball screw 71 connected to the driving device 70 rotates. To do.

  As the ball screw 71 rotates, the nut block 72 containing the nut 73 is lowered, and the lower slide base 40 and the upper slide base 41 connected to the nut block 72 are lowered. Then, the weight support body 10 connected to the upper slide base 41 is lowered.

  As the lower slide base 40 is lowered, the initial weight 21 locked to the stopper 40a of the lower slide base 40 and the bit driving device 30 and the bit 31 connected to the initial weight 21 are also lowered synchronously. To do. Since the bit driving device 30 and the like are connected to the main shaft base 50, the main shaft base 50 also descends along the guide rail 60.

  Note that the lower slide base 40 and the upper slide base 41 are both connected to the nut block 72 by connecting members (not shown), and thus move down at the same speed.

  When the lower slide base 40 is lowered, the tip of the bit 31 comes into contact with the grindstone 90 as shown in FIG.

  When the lower slide base 40 and the upper slide base 41 are further lowered and the bit 31 comes into contact with the grindstone 90, the lowering of the initial weight 21 held by the stopper 40a of the lower slide base 40 is stopped, and the bit 31 Thus, the initial weight 21 is placed on the grindstone 90, that is, the load of the initial weight 21 is applied to the grindstone 90.

  And since the initial weight 21 does not fall any more, the lowering of the spindle base 50 indirectly connected to the initial weight 21 also stops. In this state, the load of the bit driving device 30 connected to the initial weight 21 is not applied to the grindstone 90. For example, the spindle base 50 may be connected to the guide rail 60 with an appropriate load so that the spindle base 50 does not descend unless the weight of the initial weight 21 is applied.

  When the lower slide base 40 and the upper slide base 41 continue to descend after the bit 31 contacts the grindstone 90, the weight support 10 connected to the upper slide base 41 also descends. Then, as shown in FIG. 7, the bottom surface of the weight 22 supported at the lowest part of the weight support 10 is caught and placed on the convex portion 21 a formed on the initial weight 21. In this state, the weight of the initial weight 21 and the weight 22 is applied to the grindstone 90 via the bit 31.

  Further, as the upper slide base 41 continues to descend, the weight support 10 further descends, and as shown in FIG. 8, is separated from the weight 22 supported at the lowest position of the weight support 10 and the weight 22. The weight 23 that has been supported is brought into contact. Since the weight 23 is placed on the weight 22, loads of the initial weight 21, the weight 22, and the weight 23 are applied to the grindstone 90 via the bit 31.

  The movement of the weights 22 to 28 supported by the weight support 10 will be described in detail with reference to FIG. FIG. 9A shows a state where the weight 22 is not locked to the convex portion 21 a of the initial weight 21. As shown in FIG. 9B, when the weight support 10 is lowered, the bottom surface of the weight 22 is locked to the convex portion 21a of the initial weight 21, and even if the weight support 10 is lowered, the weight support 10 is lowered. Instead, it moves upward relative to the weight support 10. At this time, since the grooves 22a and 22b are formed in the weight 22, the locking protrusions 12a and 12b move upward relative to the weight support body 10 without interference. Therefore, the weight 22 is placed on the initial weight 21, and the total load of the initial weight 21 and the weight 22 is applied to the grindstone 90 via the bit 31.

  Furthermore, when the weight support body 10 is lowered and the weight 22 and the weight 23 are in contact with each other as shown in FIG. 9C, and the weight support body 10 is further lowered, the bottom surface of the weight 23 is moved from the locking projections 12a and 13a. As shown in FIG. 9D, the weight 23 is placed on the weight 22. In this state, the total load of the initial weight 21 and the weights 22 and 23 is applied to the grindstone 90 via the bit 31. At this time, the weight 23 is moved upward relative to the weight support body 10 without interfering with the locking projections 12b and 13b by the formed grooves 23a and 23b.

  FIG. 10 shows a state in which the upper slide base 41 is further lowered to the maximum and all the weights 22 to 28 that are separately supported by the weight support 10 are in contact with each other. About the operation | movement which the weights 24-28 contact, it is the same as the operation | movement which the weights 22-23 mentioned above contact. The weights 23 to 28 are placed on the respective weights 22 to 27, and the initial weight 21 and the loads of the weights 22 to 28 are applied to the grindstone 90 via the bits 31.

  As described above, after a predetermined load is applied to the grindstone 90, the control device 80 stops the driving device 70 and then drives the bit driving device 30 to rotate. As a result, the bit 31 rotates. Then, after the bit 31 rotates by a predetermined angle, the control device 80 stops the rotational driving of the bit driving device 30.

  After the rotation of the bit 31 is stopped, the control device 80 drives the ball screw driving device 70 so that the ball screw 50 rotates in the opposite direction. Then, the nut block 72 rises, so that the lower slide base 40 and the upper slide base 41 rise along the guide rail 60, and the weight support 10 connected to the upper slide base 41 rises.

  The respective weights 23 to 28 are locked to the locking projections 12a to 12f and 13a to 13f of the side plates 12 and 13, and are sequentially lifted from the weight 28 positioned at the upper level. Further, the weight 22 is placed on the bottom plate 11b of the weight support 10 and pulled up.

  Further, the convex portion 21a of the initial weight 21 comes into contact with and is locked to the stopper 41a of the lower slide base 40, and the initial weight 22 is pulled up. As the initial weight 22 rises, the bit 31 moves away from the grindstone 90 and returns to the original state shown in FIG.

  And the grindstone coupling degree is measured by measuring the depth of biting formed in the grindstone 90 by the bit 31.

  In the Ogoshi type grindstone bond degree test, it is stipulated that the same sample is measured at three or more points separated from each other by 24 mm or more on two parallel planes. Therefore, the grindstone 90 may be configured to be placed on a sample table (not shown), and the sample table may be movable on a horizontal plane. If the control device 80 is controlled to move the sample table by 24 mm or more for each measurement, the grindstone 90 is formed with three or more bites by the bit 31.

  The load applied to the grindstone 90 via the bit 31 is determined for each test standard. As an example, in the Ogoshi type grindstone bond degree test, as defined in JIS R6240, the combination of vitrified grinding wheels 490N when measuring the degree, and 785N when measuring the degree of bonding of the resinoid grinding wheel. If the weights of the initial 21 weights and the weights 22 to 28 are appropriately set so that the total load applied to the grindstone 90 via the bit 31 can be 490N and 785N depending on the combination of the initial weight 21 and the weights 22 to 28 Good. Then, the loads of 490N and 785N may be applied by controlling the lowering amount of the lower slide base 40 and the upper slide base 41 by the control device 80.

  Further, as an example, the rotation angle of the bit 31 is 120 ° in the Ogoshi type grindstone bond degree test. Therefore, when used in the Ogoshi-type grindstone bond degree test, the control device 80 may be configured to control the rotation angle of the bit driving device 30 to 120 °.

  As described above, the load variation mechanism applied to the grindstone bond degree test apparatus 1 includes the initial weight 21 and the plurality of weights 22 to 28, and only lowers the lower slide base 40 and the upper slide base 41. The weight 21 and the weight support body 10 also follow and descend, and are added to the grindstone 90 via the bit 31 in order from the initial weight 21 located at the lower position. In this way, a desired load can be applied to the grindstone 90.

  As described above, the load variation mechanism has been described using the grindstone bond degree test apparatus as an example, but the load variation mechanism can be applied to various applications.

  For example, the present invention can be applied to a compression test apparatus and a bending test apparatus that gradually apply load pressure to a subject.

  FIG. 11 is a schematic diagram showing the operation of the compression test apparatus 100. The compression test apparatus 100 includes a weight support 10 and a plurality of weights 22 to 29 supported by the weight support 10.

  Similar to the above-described grindstone bond degree test apparatus 1, the weights 22 to 29 are spaced apart and supported by the weight support 10. Moreover, the mechanism which moves the weight support body 10 up and down similarly to the above-mentioned grindstone coupling | bonding test apparatus 1 is provided.

  As shown in FIG. 11A, the subject 101 is placed below the weight support 10 and the weight support 10 is lowered. Then, the weight 22 positioned at the lower side comes into contact with the subject 101, and a load of the weight 22 is applied to the subject 101. When the weight support 10 is further lowered, the weight 23 is placed on the weight 22, and the load of the weight 22 and the weight 23 is applied to the subject 101. Then, the weights 22 to 29 that are supported separately from each other come in contact with each other in order from the bottom, and finally, as shown in FIG. 11B, the loads of all the weights 22 to 29 are applied to the subject 101. Added.

  As described above, when the load variation mechanism is applied to the compression test apparatus 100, a detection device that detects the destruction of the subject 101 is provided so that the load at which the subject 101 is destroyed can be detected. Is preferred.

  FIG. 12 shows an example in which the variable load mechanism is applied to the bending test apparatus 110. The bending test apparatus 110 includes a weight support 10, a plurality of weights 22 to 29 supported by the weight support 10, and a pressing member 111 installed on the weight 22 positioned at the lowest position.

  Similar to the compression test apparatus 100 described above, the weights 22 to 29 are supported by the weight support 10 so as to be separated from each other. Moreover, the mechanism which moves the weight support body 10 up and down similarly to the above-mentioned grindstone coupling | bonding test apparatus 1 is provided.

  As shown in FIG. 12A, the subject 112 is placed below the pressing member 111, and the weight support 10 is lowered. Then, the pressing member 111 comes into contact with the subject 112 and the subject 112 is pressed by the load of the weight 22. When the weight support 10 is further lowered, the weight 23 is placed on the weight 22 and is pressed against the subject 112 by the load of the weight 22 and the weight 23. Then, the weights 22 to 29 that are supported while being separated from each other come in contact with each other in order from the bottom, and finally, as shown in FIG. It will be pressed.

  As described above, when the load variation mechanism is applied to the bending test apparatus 110, a detection apparatus that detects the amount of deflection of the subject 112 is provided so that the degree of bending of the subject 112 can be detected. Preferably it is.

DESCRIPTION OF SYMBOLS 1 Whetstone coupling | bonding test apparatus 10 Weight support body 11a Bottom plate 11b Bottom plate 12 Side plate 12a-12f Locking protrusion 13 Side plate 13a-13f Locking protrusion 14 Side plate 21 Initial weight 21a Convex part 21b Convex part 22-29 Weight 22a-27a Groove 22b ˜27b Groove 30 Bit drive device 31 Bit 40 Lower slide base 40a Stopper 41 Upper slide base 50 Spindle base 60 Guide rail 70 Ball screw drive device 71 Ball screw 72 Nut block 73 Nut 80 Control device 90 Grinding stone 100 Compression test device 101 Subject 110 Bending Test apparatus 111 Press member 112 Subject

Claims (6)

A weight support that can be raised and lowered;
A plurality of weights that are spaced apart from each other in the vertical direction and are supported by the weight support body in such a manner that movement in the vertically downward direction is restricted.
The weight support has a locking projection for restricting the movement of the weight in the vertically downward direction,
Each of the weights is locked and supported by the locking projections,
The weight is provided with a groove through which the locking projection located above can pass,
The weight can be moved upward relative to the weight support when the weight support is lowered,
The weight support body descends toward the subject disposed below the weight, and the weight located at the lowest position directly or indirectly contacts the subject, and the weight located at the lowest position. Is applied to the subject,
Furthermore, the weight support body is lowered, and the weight applied to the subject fluctuates as the weights that have been sequentially separated from the lower order come into contact with each other.
A load variation mechanism characterized by that. A control device for controlling a descending amount of the weight support and controlling a load applied to the subject;
The load variation mechanism according to claim 1 . A weight support that can be raised and lowered;
A plurality of weights that are spaced apart from each other in the vertical direction and are supported by the weight support body, each of which is controlled to move downward in the vertical direction;
A bit attached directly or indirectly to the weight located at the lowest position,
The weight support has a locking projection for restricting the movement of the weight in the vertically downward direction,
Each of the weights is locked and supported by the locking projections,
The weight is provided with a groove through which the locking projection located above can pass,
The weight can be moved upward relative to the weight support when the weight support is lowered,
The weight support is lowered with respect to the grindstone disposed below the weight support, the bit contacts the grindstone, and the weight of the lowest weight is applied to the grindstone,
Further, the weight support is lowered, and the weight applied to the grindstone fluctuates as the weights that have been sequentially separated from the lower order come into contact with each other.
A grindstone bond degree testing apparatus characterized by that. A control device for controlling a descending amount of the weight support and controlling a load applied to the subject;
The grindstone bond degree testing apparatus according to claim 3 . A rotation drive device for rotating the bit;
After applying a predetermined amount of load to the grindstone, the bit is rotated by a predetermined angle.
5. The grindstone bond degree testing apparatus according to claim 3 or 4 , A control device for rotating the rotation drive device by a predetermined angle;
The grindstone bond degree testing apparatus according to claim 5 .

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