Verification device for testing machine and load testing machine with verification device

Abstract

To provide a tester for a testing machine capable of performing testing work in an even higher frequency range, and a load-applying tester with a tester that is equipped with such a tester for a testing machine. [Solution] A testing machine verifier (20) is characterized by comprising: a leaf spring member (21); a first annular member (22) formed in an annular shape and fixed to a load generating section (12), with a part of the leaf spring member (21) overlapping as a held portion (211); a second annular member (23) formed in an annular shape sandwiching the held portion (211) of the leaf spring member (21) between itself and the first annular member (22), and fixed to the first annular member (22) with the held portion (211) sandwiched between itself and the first annular member (22); and a load transmission member (26) attached to an attachment portion (212) of the leaf spring member (21) that intersects with the central axis (X111), and which transmits the load transmitted from the leaf spring member (21) to the load detecting section (13) as a test load in accordance with the test load.

Description

[Technical Field]

[0001] The present invention relates to a tester-use verifier that is set on a load testing machine for verification work, and a load testing machine with a verifier that is equipped with such a tester-use verifier. [Background technology]

[0002] Conventionally, load testing machines have been widely used to examine dynamic characteristics by applying a test load to a test piece, such as an anti-vibration rubber used in a vehicle engine mount. Such load testing machines are often inspected at various times, such as at the time of shipment, installation at the delivery destination, relocation, and periodic inspection, to verify whether the test piece satisfies predetermined standard performance. In this inspection, a test machine inspector designed to exhibit predetermined dynamic characteristics and set in the load testing machine instead of the test piece is often used (see, for example, Patent Document 1). In the inspection state in which the test machine inspector is set in the load testing machine, a predetermined inspection load is applied to the test machine inspector as a test load. The load transmitted from the test machine inspector in response to this inspection load is detected as the inspection load. The performance of the load testing machine is verified by comparing the detection result with the designed dynamic characteristics of the test machine inspector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-008494 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, with the spread of electric and hybrid vehicles, the dynamic characteristics required for anti-vibration rubbers used in engine mounts have been shifting toward higher frequencies. In some cases, they are required to exhibit specified dynamic characteristics under test loads up to a high frequency range of approximately 3000 Hz. In response to these demands, load testing machines have also begun to be equipped with the testing capabilities to perform tests up to a high frequency range of approximately 3000 Hz. Meanwhile, while the testing machine verifier described in the aforementioned Patent Document 1 can withstand testing up to around 1000 Hz, it currently becomes difficult to perform testing at higher frequencies due to the effects of resonance.

[0005] An object of the present invention is to provide a verifier for a testing machine that can perform verification work in even higher frequency ranges, and a load-applied testing machine with a verifier that is equipped with such a verifier for a testing machine. [Means for solving the problem]

[0006] In order to solve the above problems, a verifier for a testing machine is provided for a load-applying testing machine, the verifier comprising: a load generating unit that generates a test load in a predetermined load-applying direction; and a load detecting unit that holds a test specimen between the load generating unit and the load generating unit in the load-applying direction and measures the load transmitted from the test specimen that has received the test load. In a test state where the verifier is set in place of the test specimen, the verifier causes the load detecting unit to detect as a test load the load when the load generating unit generates a predetermined test load as the test load, and the verifier comprises: a leaf spring member that is elastically deformable in a thickness direction; Has a front and back surface The central axis of the ring is aligned with the axis of the load generating portion. and one of the front and rear surfaces is placed on the load generating portion. A member fixed to the load generating portion, the leaf spring member being such that at least a part of an inside of a ring including a central portion is occupied by the leaf spring member in a plan view from a direction along the central axis. of As the retained part, The surface of the front and rear surfaces opposite to the load generating portion side is On the surface facing the load detection unit in the verification state The held part isThe test load detection device is characterized by comprising: a first annular member that is stacked on top of the other; a second annular member that is formed in a ring shape so that the held portion of the leaf spring member is sandwiched between the first annular member and the second annular member, and is fixed coaxially to the first annular member with the held portion sandwiched between the first annular member and the second annular member; and a load transmission member that is attached to an attachment portion of the leaf spring member that intersects with the central axis, and that transmits the load transmitted from the leaf spring member in response to the test load to the load detection unit as the test load.

[0007] According to the above-described tester for a testing machine, a leaf spring member is sandwiched between a first annular member fixed to the load generating section and a second annular member fixed to the first annular member. With this configuration, since the first annular member is fixed to the load generating section, the overall rigidity of the tester for a testing machine in a test state set in the load testing machine is increased, and the spring constant is increased, resulting in a higher resonant frequency of the tester for a testing machine. As a result, testing work using the tester for a testing machine can be performed in a high-frequency range up to the increased resonant frequency. In other words, the above-described tester for a testing machine can also perform testing work in an even higher frequency range.

[0008] Here, it is preferable that the bottom portion of the load transmission member facing the load generating portion in the test state is located closer to the leaf spring member than the bottom portion of the first annular member facing the load generating portion in the test state.

[0009] With this configuration, interference between the load transmission member and the load generation portion when the spring member is deflected by the applied load can be effectively avoided without sandwiching a spacer or the like between the first annular member and the load generation portion.

[0010] It is also preferable that the device further includes a plurality of first fastening members that fasten and fix the first annular member to the load generating portion, and a plurality of second fastening members that fasten and fix the second annular member to the first annular member at positions offset from the plurality of first fastening members.

[0011] According to this configuration, the verifier for testing machines can be stored in an assembled state by fastening with the plurality of second fastening members, and during the verification operation, the assembled state is fastened to the load generating part by the plurality of first fastening members. As a result, the dynamic characteristics of the verifier for testing machines can be kept substantially constant from the time of storage until the time of the verification operation.

[0012] It is also preferable that, of the plurality of first fastening members and the plurality of second fastening members, at least the plurality of second fastening members are a plurality of screws.

[0013] According to this configuration, the verifier for testing machines is assembled by fastening with multiple screws. This reduces assembly costs compared to assembling the verifier for testing machines by welding the first annular member, the retained portion of the leaf spring member, and the second annular member. Furthermore, compared to welding, which is likely to cause distortion due to heat, it is possible to mass-produce verifiers for testing machines with less individual variation.

[0014] It is also preferable that the plurality of first fastening members are a plurality of first screws that pass through the first annular member, the held portion of the leaf spring member, and the second annular member, and are screwed into a plurality of first screw holes provided in the load generating portion, thereby fastening and fixing the first annular member to the load generating portion, and that the plurality of second fastening members are a plurality of second screws that pass through the second annular member and the held portion of the leaf spring member, and are screwed into a plurality of second screw holes provided in the first annular member, thereby fastening and fixing the second annular member to the first annular member.

[0015] According to this configuration, fastening and fixing is performed using multiple first screws and multiple second screws without using other fastening members such as nuts, thereby reducing the number of parts involved in fastening and fixing.

[0016] It is also preferable that the plurality of first screws and the plurality of second screws are arranged on the surface of the second annular member opposite the first annular member so that the screw heads are arranged alternately on the same circumference surrounding the central axis.

[0017] According to this configuration, by arranging the multiple first screws and the multiple second screws on the same circumference, it is possible to prevent the size of the testing machine verifier from increasing. Also, by arranging the first screws and the second screws alternately on the same circumference, it is possible to achieve a good balance between holding the leaf spring member by clamping it between the first annular member and the second annular member and fixing the testing machine verifier to the load generating part.

[0018] It is also preferable that the screw heads of the plurality of second screws are covered with caps after the second annular member is fastened to the first annular member, thereby preventing the connection of a fastening tool.

[0019] This configuration effectively prevents situations such as a tool being mistakenly connected to the screw heads of multiple second screws used to assemble the testing machine verifier, for example, when attaching or detaching the testing machine verifier to the load generating section.

[0020] The load transmission member includes a first transmission member that is placed on the surface of the mounting portion of the leaf spring member that faces the load detection unit in the testing state, a second transmission member that is placed on the surface of the mounting portion that faces the load generation unit in the testing state with the mounting portion sandwiched between the first transmission member and the second transmission member, a plurality of third fastening members that fasten and fix the first transmission member and the second transmission member with the mounting portion sandwiched between them, and a third fastening member that has a head cylindrical portion and a tip screw portion, and is fastened from one of the first transmission member and the second transmission member. and a reamer bolt in which the cylindrical neck portion passes through a reamer bolt communicating hole that penetrates the mounting portion and communicates from the mounting portion to a midpoint in the thickness direction of the other member with a fit tolerance that is smaller than the positional deviation tolerance of the plurality of third fastening members, and the tip threaded portion is screwed into a reamer bolt threaded hole that is formed in the other member from the midpoint in the thickness direction to the reamer bolt communicating hole, thereby fastening and fixing the first transmission member and the second transmission member to each other with the mounting portion sandwiched between them.

[0021] With this configuration, the first transmission member and the second transmission member, which are difficult to align visually due to the presence of the leaf spring member, can be precisely aligned using a reamer bolt, and then fastened and fixed using the third fastening member.

[0022] Furthermore, it is preferable that the plurality of third fastening members are a plurality of third screws that penetrate the one member and the mounting portion and are screwed into a plurality of third screw holes provided in the other member, thereby fastening and fixing the first transmission member and the second transmission member to each other with the mounting portion sandwiched between them, and that the fit tolerance is smaller than the positional deviation tolerance caused by the plurality of third screws.

[0023] According to this configuration, the number of steps can be reduced compared to, for example, riveting, and precise fastening and fixing can be performed using the reamer bolt and the plurality of third screws.

[0024] Furthermore, it is preferable that the load transmission member indirectly transmits the test load to the load detection unit via an intermediate member formed separately from the load detection unit, and that the intermediate member is interposed between the load detection unit and the load transmission member in the test state so as to abut against the load transmission member with a convex curved surface that constitutes part of a spherical surface, and that the surface of the first transmission member that faces the load detection unit in the test state has a concave curved surface that fits into the convex curved surface in the test state, and that the concave curved surface is formed so as to intersect with the central axis.

[0025] According to this configuration, by fitting a convex curved surface that forms part of the spherical surface into a concave curved surface that is formed so as to intersect with the central axis, good load transmission along the central axis from the load transmission member to the load detection unit can be effectively achieved via the intermediate member.

[0026] In order to solve the above problem, a load tester with a verification device is characterized by comprising the above-mentioned verification device for a testing device and the load tester.

[0027] According to the above-mentioned load tester with a verifier, by using the verifier for the tester, it is possible to carry out the verification work in an even higher frequency range.

[0028] Furthermore, it is preferable that the load transfer member further includes an intermediate member that is formed separately from the load detection member and is interposed between the load detection member and the load transfer member in the testing state so as to abut against the load transfer member with a convex curved surface that constitutes a part of a spherical surface, thereby intermediate the indirect transmission of the testing load from the load transfer member to the load detection member, and that the surface of the load transfer member that faces the load detection member in the testing state has a concave curved surface that fits into the convex curved surface in the testing state, formed so as to intersect with the central axis.

[0029] According to this configuration, by fitting a convex curved surface that forms part of the spherical surface into a concave curved surface that is formed so as to intersect with the central axis, good load transmission along the central axis from the load transmission member to the load detection unit can be effectively achieved via the intermediate member.

[0030] It is also preferable that the intermediate member comprises a spherical member having a portion of its surface as the convex curved surface that fits into the concave curved surface of the load transmission member in the test state, and a spherical receiving member that is attached to the load detection unit so as to be interposed between the spherical member fitted into the concave curved surface of the load transmission member in the test state and the load detection unit, and that has a receiving concave curved surface on the surface facing the spherical member that fits into another convex curved surface occupying a different position on the surface from the convex curved surface, and that is formed so as to intersect the axis of the load generation unit.

[0031] With this configuration, by sandwiching the spherical member between the concave curved surface of the load transmission member and the concave curved receiving surface of the sphere receiving member attached to the load detection unit, it is possible to transmit the load accurately and favorably along the central axis from the load transmission member to the load detection unit. Furthermore, when setting up the tester for a testing machine, it is also possible to precisely align the central axis of the tester for a testing machine with the axis of the load generation unit via the spherical member.

[0032] It is also preferable that the intermediate member further includes a plurality of fourth fastening members that fasten and fix the sphere receiving member to the load detection unit at multiple positions arranged in a single or multiple concentric circles surrounding the receiving concave surface.

[0033] According to this configuration, the sphere receiving member can be fastened to the load detecting portion in a well-balanced manner by fastening at a plurality of positions arranged in a single or multiple concentric circles.

[0034] It is also preferable that the plurality of fourth fastening members are a plurality of fourth screws that penetrate the sphere receiving member and are screwed into a plurality of fourth screw holes provided in the load detection section, thereby fastening and fixing the sphere receiving member to the load detection section.

[0035] According to this configuration, by using a screw for fastening, the sphere receiving member can be easily attached to and detached from the load detecting portion. [Effects of the Invention]

[0036] According to the above-mentioned verifier for a testing machine and the load tester with verifier, it is possible to carry out the verification work also in the higher frequency range. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is a schematic diagram showing a load tester included in a load tester with a verification device according to one embodiment. FIG. [Figure 2] FIG. 2 is a perspective view showing a verification device for the testing machine shown in FIG. 1. [Figure 3] 3 is a cross-sectional view of the tester verifier shown in FIGS. 1 and 2 when set in a load tester. FIG. [Figure 4] 3 is a top view of the verification device for the testing machine shown in FIG. 2, as seen from the direction of arrow V11 in FIG. 2. FIG. [Figure 5] FIG. 5 is an enlarged view of an area A11 in FIG. [Figure 6] 4 is a plan view of the sphere receiving member shown in FIG. 3, viewed from the sphere member side. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0038] Hereinafter, a load testing machine with a verification device according to one embodiment of the present invention will be described.

[0039] FIG. 1 is a schematic diagram showing a load tester provided in a load tester with a verification device according to one embodiment.

[0040] The load testing machine 10 included in the load testing machine with a verifier 1 of this embodiment is a device used for load testing in which a compressive or tensile load is applied to a test specimen M11 to obtain dynamic and static characteristics of the test specimen M11. The test specimen M11 here is a rubber product such as an engine mount rubber, which is one of the automotive parts. One of the characteristics obtained is the spring constant of such a rubber product. In a vibration test to obtain dynamic characteristics, a test load is applied to the test specimen M11 to obtain a dynamic spring constant, and in a static test to obtain static characteristics, a constant load is applied to the test specimen M11 to obtain a static spring constant. Below, the load testing machine 10 will be described, focusing on the vibration test to obtain dynamic characteristics.

[0041] The load testing machine 10 shown in FIG. 1 includes a machine frame 11, a load generating section 12, a load detecting section 13, an acceleration sensor 14, a weight 15, and a control section 16.

[0042] The equipment frame 11 is a frame structure that is installed at a predetermined installation location and supports the load generating unit 12 and the weight 15. The equipment frame 11 includes lower support columns 111, lower air springs 112, an intermediate frame 113, upper support columns 114, an upper surface plate 115, and upper air springs 116.

[0043] The lower support columns 111 are arranged in a forest at the installation location. One lower air spring 112 is arranged on the upper end surface of each lower support column 111, and elastically supports the intermediate frame 113 above each lower support column 111. The lower air springs 112 are elastic parts installed between each lower support column 111 and the intermediate frame 113, and suppress vibration transmission between them. The intermediate frame 113 is a frame part that supports the load generating unit 12. A plurality of upper support columns 114 are erected on the upper end surface of the intermediate frame 113, and support an upper surface of the upper support columns 114, which supports an upper surface of the upper support columns 114. The upper surface of the upper surface of the upper support columns 114 is a metal plate that supports the weight 15 on its upper surface via a plurality of upper air springs 116. A plurality of upper air springs 116 are installed between the upper surface of the upper surface of the upper support column 115, and support the weight 15. In addition, in this embodiment, each upper air spring 116 is switchable between a floating mass state in which the weight 15 is supported floating above the upper base plate 115, and a rigid state in which the weight 15 is connected to the upper base plate 115.

[0044] The load generating unit 12 is a mechanical component that holds a load-applying holding unit 121 and applies a test load to the specimen M11 by moving the load-applying holding unit 121 in a load-applying direction D11 aligned with gravity. To apply a static load to the specimen M11, the load-applying holding unit 121 is moved to one side in the load-applying direction D11, thereby applying a compressive or tensile load to the specimen M11 as a static load. The load generating unit 12 is an electrically powered mechanism that includes a movable part 122 that is provided with the load-applying holding unit 121 and is slidable in the load-applying direction D11, and a stationary part 123 that includes a drive mechanism that drives the movable part 122 when power is supplied to a drive coil (not shown). The load-applying holding unit 121 is connected to the top surface of the movable part 122, as an example of its installation configuration. Furthermore, the movable part 122 is installed so as to be movable or vibrate along a predetermined axis X11, and the immovable part 123 is disposed adjacent to the movable part 122 in an immovable state. The load generating unit 12 moves or vibrates the load-applying side holding part 121 by moving the movable part 122 along the axis X11 using the immovable part 123. Furthermore, in this embodiment, the movable part 122 has a mechanism that can vibrate the load-applying side holding part 121 up to a high frequency range exceeding 3000 Hz.

[0045] The load detection unit 13 is a part that holds the specimen M11 between itself and the load generation unit 12 in the load application direction D11 and measures the load transmitted from the specimen M11 that has received the test load, and is equipped with a support part 131, a receiving-side holding part 132, and a load sensor 133. The support part 131 is a columnar part fixed to the bottom surface of the weight 15 that passes through a through-hole 115a provided in the upper surface plate 115, and holds the receiving-side holding part 132 at its tip. The receiving-side holding part 132 is a part that holds the specimen M11 between itself and the load-applying-side holding part 121 of the load generation unit 12, and a load sensor 133 is attached at a position opposite the specimen M11 in the load application direction D11. The receiving-side holding part 132 has a circular lower surface 132a facing the specimen M11, and the specimen M11 is sandwiched between this lower surface 132a and the load-applying-side holding part 121. The load sensors 133 are sensors that measure the load transmitted from the specimen M11, and multiple load sensors 133 are attached to the receiving-side holding part 132 at the above-mentioned positions. In a static test, the load sensors 133 measure static loads that occur along the axis X11 on the specimen M11 due to compressive loads or tensile loads. In a vibration test, the load sensors 133 measure dynamic loads that occur along the axis X11 on the specimen M11 due to the test load. In addition, the load sensors 133 are sensors that can detect loads up to a high frequency range exceeding 3000 Hz, which is the range that the load generating part 12 can detect in a vibration test.

[0046] The test load is applied by a vibration operation in which the load generating unit 12 vibrates the load-applying side holding unit 121 in the loading direction D11 at an amplitude corresponding to the load to be applied. This vibration operation applies a test load to the specimen M11, which is a test load that alternates between a compressive load and a tensile load according to the amplitude. The load generating unit 12 is also capable of vibration operation up to the above-mentioned high frequency range. In the vibration test, the test load is applied while changing the vibration frequency within this frequency range up to the high frequency range, thereby obtaining a dynamic spring constant that changes with frequency changes.

[0047] The acceleration sensor 14 is a sensor that measures the acceleration of the load-applying side holding portion 121. This acceleration sensor is disposed on the axis X11 of the load-applying side holding portion 121.

[0048] As described above, the weight 15 is a mass supported by the upper air spring 116 so as to be switchable between a floating mass state and a rigid state. Its purpose is to move the resonance point of the load testing machine 10 outside the measurement frequency range during testing, particularly during vibration testing. By moving the resonance point of the load testing machine 10 outside the measurement frequency range during vibration testing, the weight 15 eliminates peaks unrelated to the vibration load. Generally, the lower the rigidity of a structure, the lower the frequency at which the resonance point of the structure appears. In the load testing machine 10 of this embodiment, by placing the weight 15 in a floating mass state using the upper air spring 116, the support rigidity of the weight 15 is reduced, and the peaks resulting from resonance can be shifted to lower frequencies. This enables vibration testing in the high-frequency range while avoiding the low-frequency peaks. Furthermore, by turning off the floating function provided by the upper air spring 116 and rigidly connecting the weight 15 to the upper surface plate 115, the support rigidity of the weight 15 is increased, and the peak due to resonance can be shifted to the higher frequency side compared to the floating mass state. This makes it possible to avoid the peak on the higher frequency side and perform vibration testing in the low frequency range, including extremely low frequencies. By shifting the peak in this way according to the target measurement frequency range in the vibration test, it is possible to exclude peaks due to resonance of the load testing machine 10 from the test results.

[0049] The control unit 16 controls the overall operation of the load testing machine 10, including the floating mass / rigid switching of the weight 15 as described above and the operation of the load generating unit 12. The control unit 16 also performs processing to acquire the spring constant based on the measurement results of the acceleration sensor 14 and the load sensor 133.

[0050] The load testing machine 10 of this embodiment has the general configuration described above. Here, this load testing machine 10 undergoes inspection work at various times, such as at the time of shipment, when installed at the delivery destination, when relocated, and during periodic inspections, in order to confirm whether or not predetermined standard performance is met. In this inspection work, a testing machine inspector 20 is used, which is designed in advance to exhibit predetermined dynamic characteristics and is set in the load testing machine 10 in place of the test specimen M11. The load testing machine with inspector 1 of this embodiment includes the load testing machine 10 and the testing machine inspector 20, and the inspection work is performed with the testing machine inspector 20 set in the load testing machine 10.

[0051] Fig. 2 is a perspective view of the testing machine verifier shown in Fig. 1, and Fig. 3 is a cross-sectional view of the testing machine verifier shown in Figs. 1 and 2 set in a load testing machine. Fig. 4 is a top view of the testing machine verifier shown in Fig. 2, seen from the direction of arrow V11 in Fig. 2, and Fig. 5 is an enlarged view of area A11 in Fig. 4. Fig. 6 is a plan view of the sphere receiving member shown in Fig. 3, seen from the sphere member side. Figs. 3 and 4 show cross-sectional views of the testing machine verifier 20 taken along line V12-V12 in the top view shown in the upper part of Fig. 4.

[0052] The testing machine verifier 20 in this embodiment is a device that is set in the load testing machine 10 in place of the specimen M11 as described above and is used for verification work. This testing machine verifier 20 is a verifier that, in a verification state set in the load testing machine 10, causes the load detecting unit 13 to detect, as a verification load, the load generated when the load generating unit 12 generates a predetermined verification load as a test load. The testing machine verifier 20 includes a leaf spring member 21, a first annular member 22, a second annular member 23, a plurality (eight in this case) of first screws 24, a plurality (eight in this case) of second screws 25, and a load transmitting member 26.

[0053] The plate spring member 21 is a circular plate member made of stainless steel and elastically deformable in the thickness direction. The surface of the plate spring member 21 is subjected to rust prevention treatment such as anodizing.

[0054] The first annular member 22 is an aluminum member formed in a circular ring shape having approximately the same outer diameter as the leaf spring member 21, and is fixed to an upper end surface 121a of the load-applying side holding portion 121 of the load generating portion 12, the upper end surface 121a facing the load detecting portion 13. The first annular member 22 is fixed to the load generating portion 12 so that the central axis X111 of the ring of the first annular member 22 overlaps with the axis X11 of the load generating portion 12. In other words, a lower surface 222, which is one surface of the first annular member 22 facing the load generating portion 12 and is the back surface of the upper surface 221, overlaps the load generating portion 12. 2 along the central axis X111, a portion of the circular ring shape having the same width as the first annular member 22 extending from the outer periphery of the leaf spring member 21 serves as a held portion 211, and is superimposed on an upper surface 221, which serves as the other surface of the first annular member 22 facing the load detection unit 13 in the above-described testing state. At this time, at least a portion (in this embodiment, the entire) of the inside of the circular ring of the first annular member 22, including the central portion, is occupied by the leaf spring member 21.

[0055] The second annular member 23 is an aluminum member formed in a circular ring shape with the same diameter and width as the first annular member 22 so as to sandwich the held portion 211 of the leaf spring member 21 between itself and the first annular member 22. The second annular member 23 is fixed coaxially to the first annular member 22 with the held portion 211 of the leaf spring member 21 sandwiched between itself and the first annular member 22.

[0056] The eight first screws 24 are first fastening members that fasten the first annular member 22 to the upper end surface 121a of the load-applying side holding portion 121 of the load generating portion 12. The first annular member 22, the held portion 211 of the leaf spring member 21, and the second annular member 23 are formed with first screw through holes 22a, 21a, and 23a that communicate with one another and through which the first screws 24 pass in a one-to-one correspondence. Furthermore, the upper end surface 121a of the load-applying side holding portion 121 is formed with first threaded holes 121b that communicate with these first screw through holes 22a, 21a, and 23a. Each first screw 24 passes through the first screw through holes 22a, 21a, and 23a that are arranged in communication with one another and is screwed into the first threaded hole 121b in the load generating portion 12, thereby performing the above-mentioned fastening.

[0057] The eight second screws 25 are second fastening members that fasten the second annular member 23 to the first annular member 22. Second screw through holes 23b, 21b, through which the second screws 25 pass in a one-to-one correspondence at positions offset from the first screws 24, are formed in the second annular member 23 and the held portion 211 of the leaf spring member 21. Furthermore, second screw holes 22b that communicate with the second screw through holes 23b, 21b are formed in the first annular member 22. Each second screw 25 passes through the second screw through holes 23b, 21b that are arranged in communication with each other, and is screwed into the second screw hole 22b in the first annular member 22, thereby performing the above-mentioned fastening.

[0058] The eight first screws 24 and the eight second screws 25 are provided on the top surface 231 of the second annular member 23 opposite the first annular member 22 such that the screw heads 241, 251 are alternately arranged on the same circumference surrounding the central axis X111 of the ring. The first screws 24 and the second screws 25 are hexagonal screws, each with a hexagonal hole formed in the screw head 241, 251 as a tool fitting hole 241a, 251a into which a tool fits during fastening. The screw heads 251 of all eight second screws 25, except for the first screw 24 that is fastened or detached during inspection, are covered with caps 252 to close the tool fitting holes 251a after the second annular member 23 is fastened and fixed to the first annular member 22. The first screws 24 that are fastened or detached as described above are attached with flat washers 242 interposed between the screw heads 241 and the top surface 231 of the second annular member 23.

[0059] The load transmission member 26 is attached to an attachment portion 212 of the leaf spring member 21 that intersects with the central axis X111 of the ring, and is a member that transmits a load transmitted from the leaf spring member 21 in accordance with the test load as a test load to the load detection unit 13. The attachment portion 212 of the leaf spring member 21 is the central portion of the disk-shaped leaf spring member 21. The load transmission member 26 attached to this attachment portion 212 includes a first transmission member 261, a second transmission member 262, a plurality of (eight in this case) third screws 263, and a reamer bolt 264.

[0060] The first transmission member 261 is a small-diameter circular plate member made of aluminum that is placed on the surface facing the load detection unit 13 in the mounting portion 212 of the leaf spring member 21 in the testing state, and has a predetermined gap between it and the inner edge of the second annular member 23.

[0061] The second transmission member 262 is a circular plate member made of aluminum and of approximately the same diameter as the first transmission member 261, which is placed on the surface of the mounting portion 212 of the leaf spring member 21 facing the load generating section 12 in the testing state, with the mounting portion 212 sandwiched between it and the first transmission member 261.

[0062] The eight third screws 263 are third fastening members that are attached from the side facing the load generating unit 12 in the testing state and fasten the second transmission member 262 to the first transmission member 261. Third screw through holes 262a, 21c, through which the third screws 263 pass in a one-to-one correspondence, are formed in the second transmission member 262 and the mounting portion 212 of the leaf spring member 21. Furthermore, a third screw hole 261a that communicates with the third screw through holes 262a, 21c is formed in the first transmission member 261 (see FIG. 5). Each third screw 263 passes through the third screw through holes 262a, 21c that are arranged in communication with each other and is screwed into the third screw hole 261a in the first transmission member 261, thereby performing the above-mentioned fastening.

[0063] The eight third screws 263 are provided on a lower surface 262b of the second transmission member 262 facing the load generating portion 12 so that the screw heads 263a are aligned on the same circumference surrounding the central axis X111 of the ring.

[0064] The reamer bolt 264 has a screw head 264a, a neck cylindrical portion 264b, and a tip threaded portion 264c, and is a member that fastens and fixes the second transmission member 262 to the first transmission member 261. Reamer bolt through holes 262c, 21d, through which the neck cylindrical portion 264b passes, are formed along the central axis X111 of the ring at the center of the second transmission member 262 and the center of the mounting portion 212 of the leaf spring member 21. Furthermore, a reamer bolt recess 261b, which communicates with the reamer bolt through holes 262c, 21d, is formed in the center of the first transmission member 261 to a position midway in the thickness direction. Furthermore, a reamer bolt threaded hole 261c is formed along the central axis X111 of the ring from a position midway in the thickness direction where the bottom of the reamer bolt recess 261b is located. The reamer bolt through holes 262c, 21d and the reamer bolt recess 261b form a reamer bolt communicating hole through which the neck cylindrical portion 264b passes. The reamer bolt threaded hole 261c is formed continuous with this reamer bolt communicating hole. The neck cylindrical portion 264b passes through the reamer bolt communicating hole with a fit tolerance that is smaller than the positional deviation tolerance of the eight third screws 263. In the testing state, the neck cylindrical portion 264b of the reamer bolt 264 passes through the reamer bolt through holes 262c, 21d of the second transmission member 262 and the mounting portion 212 along the central axis X111 from the side facing the load generating unit 12. The neck cylindrical portion 264b further enters the reamer bolt recess 261b of the first transmission member 261, and the tip threaded portion 264c is screwed into the reamer bolt threaded hole 261c provided at the end of the entry, thereby fastening and fixing the second transmission member 262 to the first transmission member 261.

[0065] At this time, the difference between the inner diameter of the reamer bolt through holes 262c, 21d and the reamer bolt recess 261b and the outer diameter of the neck cylindrical portion 264b is smaller than the difference between the inner diameter of the third screw through holes 262a, 21c and the outer diameter of the third screw 263. As a result, the reamer bolt 264 fastens and fixes the second transmission member 262, the mounting portion 212, and the first transmission member 261 while reducing positional misalignment between them compared to when they are fastened and fixed only by the eight third screws 263.

[0066] When attaching the load transmission member 26 to the attachment portion 212 of the leaf spring member 21, first, temporary tightening is performed using the eight third screws 263. In this temporary tightening state, the second transmission member 262, the attachment portion 212, and the first transmission member 261 are mutually positioned by fastening and fixing the reamer bolts 264, and then the eight third screws 263 are finally tightened with a predetermined torque.

[0067] Thus, nine screw heads 263a, 264a protrude from the lower surface 262b of the second transmission member 262 of the load transmission member 26 attached to the attachment portion 212 toward the load generating unit 12. Accordingly, the first annular member 22 surrounding the outer periphery of the second transmission member 262 is formed with a sufficient thickness to provide a gap between the screw heads 263a, 264a and the load generating unit 12 to avoid interference during vibration application. The second transmission member 262 of the load transmission member 26 is also thinner than the first annular member 22 to contribute to the above-mentioned interference avoidance. On the other hand, the first transmission member 261 of the load transmission member 26 is formed with a sufficient thickness to be fastened and fixed by the eight third screws 263 and reamer bolts 264. The thickness of the first transmission member 261 is also sufficient to transmit the test load to the load detecting unit 13 via the intermediate member 30 shown in FIG. 3 .

[0068] In this embodiment, the third screw 263 and the reamer bolt 264 are attached from the side facing the load generating portion 12, with the screw heads 263a and 264a protruding from the underside 262b of the second transmission member 262 toward the load generating portion 12. However, the orientation of the third screw and the reamer bolt in the load transmission member is not limited to this, and they may be attached from the side facing the load detecting portion, which is the opposite orientation to this embodiment. In this case, the screw heads protrude from the upper surface of the first transmission member toward the load detecting portion, and the underside of the second transmission member remains flat. The thickness of the first annular member and the second transmission member of the load transmission member is sufficient to provide a gap to avoid interference with this flat underside.

[0069] 5, the inner edges of the first annular member 22 and the second annular member 23, which face the leaf spring member 21, are rounded to form curved surfaces 223 and 232. The outer edges of the first transmission member 261 and the second transmission member 262, which face the leaf spring member 21, are rounded to form curved surfaces 261f and 262d. These curved surfaces 223, 232, 261f, and 262d suppress stress concentration at the contact portions of the leaf spring member 21 with the first annular member 22, the second annular member 23, the first transmission member 261, and the second transmission member 262 during vibration.

[0070] The intermediate member 30 is a member attached during the inspection process to set the testing machine inspector 20 so that the central axis X111 of the ring coincides with the axis X11 of the load testing machine 10. The intermediate member 30 is formed separately from the load detection unit 13. In the inspection state, the intermediate member 30 is interposed between the load detection unit 13 and the load transmission member 26 so that a convex curved surface 31a constituting a part of a spherical surface abuts against the load transmission member 26. A first transmission member 261 of the load transmission member 26 has an upper surface 261d facing the load detection unit 13 in the inspection state, which has a concave curved surface 261e formed on the upper surface 261d. The concave curved surface 31a fits into the concave curved surface 31a in the inspection state, and the concave curved surface 261e intersects with the central axis X111. The reamer bolt threaded hole 261c of the first transmission member 261 is formed through the concave curved surface 261e so as to open to the central bottom portion through which the central axis X111 passes. The eight third screw holes 261a are formed so as to penetrate the recessed curved surface 261e and open on the same circumference.

[0071] The intermediate member 30 is thus interposed between the load detection unit 13 and the load transmission member 26, thereby mediating the indirect transmission of the test load from the load transmission member 26 to the load detection unit 13. The intermediate member 30 includes a spherical member 31, a spherical receiving member 32, and a plurality of (here, 12) fourth screws 33.

[0072] The spherical member 31 is a steel ball, part of whose surface is the above-mentioned convex curved surface 31a, which fits into the concave curved surface 261e of the first transmission member 261 of the load transmission member .

[0073] The sphere receiving member 32 is an aluminum member that is attached to the receiving-side holding portion 132 of the load detection unit 13 so as to be interposed between the spherical member 31, which is fitted onto the concave curved surface 261e of the first transmission member 261, and the load detection unit 13 in the calibration state. The sphere receiving member 32 is a circular plate member that is attached by being superimposed on the circular lower surface 132a of the receiving-side holding portion 132 and has approximately the same diameter as the lower surface 132a. A receiving concave curved surface 322 is formed in the center of the lower surface 321 of the sphere receiving member 32 that faces the spherical member 31. The receiving concave curved surface 322 is a concave curved surface that fits with another convex curved surface 31b that occupies a position on the surface of the spherical member 31 that is different from the convex curved surface 31a on the first transmission member 261 side so as to intersect with the central axis X111.

[0074] The twelve fourth screws 33 are fourth fastening members that fasten and fix the sphere receiving member 32 to the receiving-side holder 132 of the load detection unit 13 at multiple positions arranged in a single or multiple (here, double) concentric circles surrounding the receiving concave curved surface 322. The fourth screws 33 are attached so that six are arranged on each of the double concentric circles. Fourth screw through holes 323 through which the twelve fourth screws 33 pass one-to-one are formed in the sphere receiving member 32, and fourth screw holes 132b that communicate with the fourth screw through holes 323 are formed in the receiving-side holder 132 of the load detection unit 13. Each fourth screw 33 passes through the fourth screw through hole 323 and is screwed into the fourth screw hole 132b in the receiving-side holder 132, thereby fastening and fixing the sphere receiving member 32 to the receiving-side holder 132 of the load detection unit 13. At this time, countersunk holes 324 for the screw heads 331 of the twelve fourth screws 33 are formed in the lower surface 321 of the sphere receiving member 32. The screw heads 331 of the fourth screw holes 132b in the fastened state are received in the countersunk holes 324 in the lower surface 321 of the sphere receiving member 32.

[0075] In a testing state in which the testing machine verifying device 20 is set between the receiving-side holding portion 132 of the load detecting portion 13 and the load generating portion 12 via the intermediate member 30, the test load generated by the load generating portion 12 is detected by the load sensors 133 of the load detecting portion 13. In this embodiment, six load sensors 133 are provided on the receiving-side holding portion 132 on the opposite side of the specimen M11 so as to surround the axis X11 of the load generating portion 12 (i.e., the central axis X111 of the testing machine verifying device 20 in the testing state). The detection results of the load sensors 133 are sent to the control portion 16, and the control portion 16 compares the detection results with the designed dynamic characteristics of the testing machine verifying device 20, thereby confirming the performance of the load-applied testing machine 10.

[0076] Up to this point, the explanation of the testing machine verifier 20 has been given with a focus on dynamic performance confirmation of the load test machine 10, but this testing machine verifier 20 can also be used to confirm static performance of the load test machine 10. That is, the testing machine verifier 20 is also designed in advance to exhibit predetermined static characteristics. In static performance confirmation, the static performance of the load test machine 10 is confirmed by, for example, comparing the detection result of the test load when a static test load is applied to the testing machine verifier 20 in the load test machine 10 with the designed dynamic characteristics.

[0077] According to the above-described embodiment of the verifier for testing machine 20 and the load tester with verifier 1, the leaf spring member 21 is sandwiched between the first annular member 22 fixed to the load generating unit 12 and the second annular member 23 fixed to the first annular member 22. In this configuration, the first annular member 22 is fixed to the load generating unit 12, which increases the overall rigidity of the verifier for testing machine 20 when set in the load tester 10 for testing. This increases the spring constant, resulting in a higher resonant frequency of the verifier for testing machine 20. Furthermore, in anticipation of such a higher resonant frequency, it is possible to set the resonant frequency to, for example, 3000 Hz or higher by appropriate dimensional selection. As a result, the verifier for testing machine 20 can be used to perform testing in a high-frequency range up to such an increased resonant frequency. In other words, the verifier for testing machine 20 of this embodiment can also perform testing in an even higher-frequency range.

[0078] In this embodiment, the bottom portion of the load transmission member 26 facing the load generation portion 12 is located closer to the leaf spring member 21 than the bottom portion of the first annular member 22 facing the load generation portion 12 in the test state. With this configuration, interference between the load transmission member 26 and the load generation portion 12 when the spring member 21 is deflected by an applied load can be effectively avoided without inserting a spacer or the like between the first annular member 22 and the load generation portion 12.

[0079] Furthermore, in this embodiment, eight first screws 24 (first fastening members) that fasten the first annular member 22 to the load generating section 12 and eight second screws 25 (second fastening members) that fasten the second annular member 23 to the first annular member 22 are further provided. With this configuration, the testing machine verifier 20 can be stored in an assembled state fastened with the eight second screws 25, and during the verification operation, the assembled state is fastened to the load generating section 12 with the eight first screws 24. As a result, the dynamic characteristics of the testing machine verifier 20 can be maintained in a substantially constant state from storage until the verification operation.

[0080] Furthermore, in this embodiment, of the first and second fastening members, at least the second fastening member (here, both the first and second fastening members) is a screw. With this configuration, the testing machine inspector 20 is assembled by fastening and fixing with screws, which reduces assembly costs and the like compared to assembly by welding or the like. Furthermore, compared to welding, which is likely to cause distortion due to heat, the testing machine inspector 20 can be mass-produced with reduced individual variation.

[0081] In the present embodiment, eight first screws 24 pass through the first annular member 22, the held portion 211 of the leaf spring member 21, and the second annular member 23, and are screwed into eight first screw holes 121b provided in the load generating portion 12. Eight second screws 25 pass through the second annular member 23 and the held portion 211 of the leaf spring member 21, and are screwed into eight second screw holes 22b provided in the first annular member 22. With this configuration, fastening and fixing can be performed using the multiple first screws and the multiple second screws without using other fastening members such as nuts, and therefore the number of parts required for fastening and fixing can be reduced.

[0082] In this embodiment, the eight first screws 24 and the eight second screws 25 are provided on the upper surface 231 of the second annular member 23 so that the screw heads 241, 251 are arranged alternately on the same circumference. With this configuration, by arranging the eight first screws 24 and the eight second screws 25 on the same circumference, it is possible to prevent the testing machine inspector 20 from becoming larger. Furthermore, by arranging the first screws 24 and the second screws 25 alternately on the same circumference, it is possible to achieve a good balance between holding the leaf spring member 21 by clamping it between the first annular member 22 and the second annular member 23 and fixing the testing machine inspector 20 to the load generating unit 12.

[0083] In this embodiment, the screw heads 241, 251 of the first screw 24 and the second screw 25 are covered with caps 252 after fastening and fixing, thereby preventing the connection of a fastening tool. This configuration effectively prevents a situation in which a tool is mistakenly connected to the tool fitting hole 251a of the screw head 251 of the second screw 25 when, for example, attaching or detaching the testing machine verifying device 20 to or from the load generating unit 12.

[0084] Moreover, in this embodiment, the load transmission member 26 includes a first transmission member 261, a second transmission member 262, eight third screws 263 (third fastening members) that fasten the first transmission member 261 and the second transmission member 262 together, and a reamer bolt 264. This configuration makes it possible to precisely fasten the first transmission member 261 and the second transmission member 262, which are difficult to align visually due to the presence of the leaf spring member 21, as follows: That is, after precise alignment is achieved using the reamer bolt 264, the third screws 263 (third fastening members) can be used to fasten the first transmission member 261 and the second transmission member 262 together.

[0085] Furthermore, in this embodiment, the third fastening member is the third screw 263, and the fit tolerance of the reamer bolt 264 is smaller than the positional deviation tolerance of the third screw 263. With this configuration, precise fastening and fixing can be performed using the reamer bolt 264 and the third screw 263 with less man-hours than, for example, riveting or the like.

[0086] In the present embodiment, the intermediate member 30, which intermediates the load transmission from the load transmission member 26 to the load detection unit 13, abuts against the load transmission member 26 at the convex curved surface 31a that constitutes a part of a spherical surface. Furthermore, the upper surface 261d of the first transmission member 261 is formed with a concave curved surface 261e, into which the convex curved surface 31a fits, so as to intersect with the central axis X111. With this configuration, by fitting the convex curved surface 31a that constitutes a part of the spherical surface into the concave curved surface 261e that is formed so as to intersect with the central axis X111, it is possible to achieve good load transmission from the load transmission member 26 to the load detection unit 13 along the central axis X111.

[0087] In this embodiment, the reamer bolt threaded holes 261c open at the center bottom of the concave curved surface 261e. This configuration can reduce the impact on the fitting accuracy between the convex curved surface 31a and the concave curved surface 261e. In this embodiment, the eight third threaded holes 261a used to fasten the first transmission member 261 and the second transmission member 262 are formed to penetrate the concave curved surface 261e so as to open on the outer periphery, which also reduces the impact on the fitting accuracy.

[0088] In this embodiment, the intermediate member 30 includes a spherical member 31 and a sphere receiving member 32 attached to the load detection unit 13. The sphere receiving member 32 has a concave receiving surface 322, into which another convex surface 31b on the surface of the spherical member 31 fits, formed so as to intersect with the axis X11 of the load generation unit 12. With this configuration, sandwiching the spherical member 31 between the concave surface 261e of the load transmission member 26 and the concave receiving surface 322 of the sphere receiving member 32 enables accurate and favorable load transmission from the load transmission member 26 to the load detection unit 13 along the central axis X111. Furthermore, when setting the testing machine inspector 20, the spherical member 31 can be used to precisely align the central axis X111 of the testing machine inspector 20 with the axis X11 of the load generation unit 12. This alignment is performed, for example, by the following procedure. First, the testing machine inspector 20 is fastened to the load generation unit 12 with the first screw 24 in a pre-tightened state. Next, the spherical member 31 is clamped between the receiving concave surface 322 of the sphere receiving member 32, which intersects with the axis X11, and the concave surface 261e of the load transmitting member 26, which intersects with the central axis X111. This clamping causes the testing machine inspector 20 in a provisionally fastened state to move slightly, thereby aligning the central axis X111 of the testing machine inspector 20 so that it overlaps with the axis X11 of the load generating unit 12. After this alignment, the first screw 24 is tightened to a predetermined torque.

[0089] Moreover, in this embodiment, the intermediate member 30 is provided with twelve fourth screws 33 (fourth fastening members) that fasten and fix the sphere receiving member 32 to the load detection unit 13 at multiple positions arranged in double concentric circles surrounding the receiving concave curved surface 322. According to this configuration, the sphere receiving member 32 can be fixed to the load detection unit 13 in a well-balanced manner by fastening and fixing at multiple positions arranged in a single or multiple concentric circles.

[0090] In this embodiment, the fourth fastening member is a fourth screw 33 that penetrates the sphere receiving member 32 and is screwed into a fourth screw hole 132b provided in the load detection unit 13. According to this configuration, by using fastening fixation with a screw, the sphere receiving member 32 can be easily attached to and detached from the load detection unit 13.

[0091] The above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to this. In other words, various modifications can be made without departing from the gist of the present invention. Even if such modifications are made, they are of course included in the scope of the present invention as long as they still have the configuration of the proving device for a testing machine and the load testing machine with proving device of the present invention.

[0092] For example, in the above-described embodiment, the load testing machine 10 is exemplified as an example of a load testing machine, in which a rubber product such as an engine mount rubber, which is one of the automobile parts, is used as the test specimen M11. However, the load testing machine is not limited to this, and can test specimens of any material, not limited to such rubber products.

[0093] In the above-described embodiment, the load testing machine 10 that performs both static testing and vibration testing is exemplified as an example of the load testing machine. However, the load testing machine is not limited to this, and may be one that performs only vibration testing.

[0094] Furthermore, in the above-described embodiment, the tester for a testing machine 20 is exemplified as an example of a tester for a testing machine in which the bottom of the load transmission member 26 is located closer to the leaf spring member 21 than the bottom of the first annular member 22. However, the tester for a testing machine is not limited to this. The bottom of the first annular member 22 may be located closer to the leaf spring member 21 than the bottom of the load transmission member 26, and interference between the load transmission member 26 and the load generation unit 12 may be avoided by inserting a spacer or the like between the first annular member 22 and the load generation unit 12. However, as described above, since the bottom of the load transmission member 26 is closer to the leaf spring member 21 than the bottom of the first annular member 22, the above-described interference can be effectively avoided without inserting a spacer or the like.

[0095] In the above-described embodiment, the testing machine verifier 20 is exemplified as an example of a testing machine verifier, which is provided with eight first screws 24 (first fastening members) that fasten the first annular member 22 to the load generating unit 12. The testing machine verifier 20 is also provided with eight second screws 25 (second fastening members) that fasten the second annular member 23 to the first annular member 22. However, the testing machine verifier is not limited to this. For example, the same fastening members may be used to fasten the first annular member to the load generating unit and the second annular member to the first annular member. However, as described above, by using different fastening members to fasten the first annular member to the load generating unit and the second annular member to the first annular member, the dynamic characteristics of the testing machine verifier 20 can be maintained substantially constant from storage to the verification operation.

[0096] Furthermore, in the above-described embodiment, the first screw 24 and the second screw 25 are given as an example of the first fastening member and the second fastening member. However, the first fastening member and the second fastening member are not limited to this, and may be fastening marks formed by welding or the like. However, as described above, by fastening the second annular member to the first annular member by screw fastening, costs associated with assembling the testing machine indicator 20 can be reduced. Furthermore, as described above, compared to welding, which is likely to cause distortion due to heat, the testing machine indicator 20 can be mass-produced with reduced individual variations.

[0097] In the above-described embodiment, the first fastening member is exemplified by the first screw 24, which penetrates the first annular member 22, the retained portion 211 of the leaf spring member 21, and the second annular member 23 and is screwed into the first screw hole 121b of the load generating portion 12. The second fastening member is exemplified by the second screw 25, which penetrates the second annular member 23 and the retained portion 211 of the leaf spring member 21 and is screwed into the second screw hole 22b of the first annular member 22. However, the first fastening member and the second fastening member are not limited to this and may be fastening marks formed by welding or the like. However, as described above, the fastening structure including the first screw 24, the first screw hole 121b, the second screw 25, and the second screw hole 22b can reduce the number of parts required for fastening. The number of first screws and second screws is not limited to eight, and any number more than one may be used.

[0098] Furthermore, in the above-described embodiment, as an example of a verifier for a testing machine, verifier for a testing machine 20 is exemplified in which the entire inside of second annular member 23 and first annular member 22 is occupied by disc-shaped leaf spring member 21. However, the verifier for a testing machine is not limited to this, and the inside of second annular member and first annular member may be occupied only partially, including the central portion, by a leaf spring member having, for example, a strip-like, X-shaped, or Y-shaped configuration.

[0099] Furthermore, in the above-described embodiment, as an example of a verifier for a testing machine, the verifier for a testing machine 20 is exemplified, in which the screw heads 241, 251 of the first screws 24 and the second screws 25 are arranged alternately on the same circumference. However, the verifier for a testing machine is not limited to this, and any arrangement of the first screws and second screws can be adopted. However, as described above, by arranging the first screws 24 and the eight second screws 25 alternately on the same circumference, it is possible to hold the leaf spring member 21 and fix the verifier for a testing machine 20 to the load generating unit 12 in a well-balanced manner.

[0100] Furthermore, in the above-described embodiment, as an example of a testing machine verifier, the testing machine verifier 20 is exemplified, in which the cap 252 is placed on the screw head 251 of the second screw 25 other than the first screw 24 used for attachment to the load generating unit 12. However, the testing machine verifier is not limited to this, and may be one in which no cap is particularly attached. However, as described above, by attaching the cap 252, it is possible to effectively prevent a situation in which a tool is erroneously connected to the screw head 251 of the second screw 25.

[0101] Furthermore, in the above-described embodiment, the load transmission member 26 includes the first transmission member 261, the second transmission member 262, eight third screws 263 (third fastening members), and the reamer bolt 264. However, the load transmission member is not limited to this, and the specific configuration thereof is not limited to this. However, as described above, with the above configuration, precise alignment can be performed using the reamer bolt 264, and then fastening and fixing can be performed using the third screws 263 (third fastening members).

[0102] Furthermore, in the above-described embodiment, the third screw 263 screwed into the third screw hole 261a of the first transmission member 261 is exemplified as an example of the third fastening member. However, the third fastening member is not limited to this, and may be a fastening member other than a screw, such as a rivet. However, as described above, precise fastening and fixation can be achieved by using the above-described third screw 263 together with the reamer bolt 264.

[0103] Furthermore, in the above-described embodiment, as an example of the third screw and reamer bolt, the third screw 263 and reamer bolt 264 are exemplified, which are attached by penetrating the second transmission member 262 from the side facing the load generating unit 12. However, the third screw and reamer bolt are not limited to this, and may be attached by penetrating the first transmission member from the side facing the load detecting unit.

[0104] In the above-described embodiment, the load transmission member 26 is exemplified as an example of a load transmission member in which the third screw hole 261a and the reamer bolt screw hole 261c are formed and opened through the load transmission member 26. However, the load transmission member is not limited to this, and the third screw hole and the reamer bolt screw hole may be formed in a non-through state.

[0105] Furthermore, in the above-described embodiment, as an example of the inspector for a testing machine and the load tester with an inspector, the inspector for a testing machine 20 and the load tester with an inspector 1 are exemplified, in which the intermediary member 30 intervenes in the load transmission by fitting the convex curved surface 31a into the concave curved surface 261e of the load transmission member 26. However, the inspector for a testing machine and the load tester with an inspector are not limited to this, and the load transmission member and the load detection unit may be configured to be in direct contact with each other without providing an intermediary member or the like. However, as described above, providing the intermediary member 30 enables good load transmission from the load transmission member 26 to the load detection unit 13 along the central axis X111.

[0106] In the above-described embodiment, the intermediate member 30 including the spherical member 31 and the sphere receiving member 32 having the receiving concave surface 322 is exemplified as an example of the intermediate member. However, the intermediate member is not limited to this, and may be, for example, a member that protrudes in a columnar shape from a member attached to the load detection unit and has a convex surface at its tip that fits with the concave surface of the load transfer member. However, as described above, good load transfer can be achieved by sandwiching the spherical member 31 between the concave surface 261e of the load transfer member 26 and the receiving concave surface 322 of the sphere receiving member 32.

[0107] Furthermore, in the above-described embodiment, an example of the intermediary member is the intermediary member 30 in which the sphere receiving member 32 is fastened to the load detection unit 13 by twelve fourth screws 33 (fourth fastening members) arranged at multiple positions in a double concentric circle surrounding the receiving concave curved surface 322. However, the intermediary member is not limited to this, and any manner of attaching the sphere receiving member to the load detection unit may be adopted. However, as described above, fastening at twelve positions arranged concentrically allows for a balanced fixation of the sphere receiving member 32 to the load detection unit 13. Note that the number of fastening points using the fourth fastening members is not limited to twelve, and any number of positions may be adopted as long as there are multiple positions. Furthermore, the arrangement of the fastening points is not limited to a double concentric circle arrangement, and the number of concentric circles may be one, three, or more, as long as the arrangement is a single or multiple concentric circle arrangement surrounding the receiving concave curved surface.

[0108] Furthermore, in the above-described embodiment, the fourth screw 33 that penetrates the sphere receiving member 32 and is screwed into the fourth screw hole 132b provided in the load detection unit 13 is exemplified as an example of the fourth fastening member. However, the fourth fastening member is not limited to this, and may be a member other than a screw, such as a fastening pin, for example. However, as described above, by employing fastening fixation with a screw, the sphere receiving member 32 can be easily attached to and detached from the load detection unit 13. [Explanation of symbols]

[0109] 1 Load testing machine with verification device 10 Load testing machine 11 Equipment Frame 12 Load generating section 13 Load detection unit 14 Acceleration sensor 15 weight 16 Control Unit 20 Testing machine verification device 21 Leaf spring member 22a, 21a, 23a First screw through hole 23b, 21b Second screw through hole 21c, 262a Third screw through hole 21d, 262c Reamer bolt through hole (part of reamer bolt communication hole) 22 First annular member 22b Second screw hole 23 Second annular member 24 First screw (first fastening member) 25 Second screw (second fastening member) 26 Load transmission member 30 Intermediate parts 31 Spherical member 31a Convex curved surface 31b Another convex surface 32 Sphere receiving member 33 Fourth screw (fourth fastening member) 111 Lower support column 112 Lower air spring 113 Intermediate Frame 114 Upper support column 115 Upper surface plate 115a Through hole 116 Upper air spring 121 Load side holding part 121a Top surface 121b First screw hole 122 Moving parts 123 Fixed part 131 Pillar section 132 Receiving side holding part 132a,321 Bottom surface 132b 4th screw hole 133 Load Sensor 211 Part to be held 212 Mounting part 221,231,261d Top surface 222,262b Bottom surface 223,232,261f,262d Curved part 241, 251, 263a, 264a, 331 Screw head 241a,251a Tool fitting hole 242 Flat washer 252 Cap 261 First transmission member 261a 3rd screw hole 261b Reamer bolt recess (part of reamer bolt communication hole) 261c Reamer bolt threaded hole 261e concave surface 262 Second transmission member 263 Third screw (third fastening member) 264 Reamer Bolt 264b Cylinder under the neck 264c Tip thread 322 Receiving concave surface 323 4th screw through hole 324 Countersunk Hole D11 Load direction M11 specimen X11 axis center X111 center axis

Claims

1. A load testing machine includes a load generating unit that generates a test load in a predetermined loading direction, and a load detecting unit that holds a specimen between the load generating unit and the load generating unit in the loading direction and measures a load transmitted from the specimen that has received the test load. In a testing state where the load generating unit is set in place of the specimen, the load detecting unit detects, as a testing load, a load when the load generating unit generates a predetermined testing load as the test load, a leaf spring member that is elastically deformable in a thickness direction; a first annular member formed in an annular shape having a front and back surfaces, the central axis of the ring overlapping the axis of the load generating portion, and one of the front and back surfaces being overlapped with the load generating portion, the first annular member being fixed to the load generating portion in a state in which the central axis of the ring overlaps with the axis of the load generating portion, the leaf spring member having a part as a held portion such that at least a part of the inside of the ring including a central portion is occupied by the leaf spring member in a plan view from a direction along the central axis, and the held portion is overlapped with one of the front and back surfaces on the side opposite to the load generating portion and facing the load detecting portion in the test state; a second annular member formed in an annular shape such that the held portion of the leaf spring member is sandwiched between the second annular member and the first annular member, and the second annular member is fixed coaxially to the first annular member in a state in which the held portion is sandwiched between the first annular member and the second annular member; a load transmission member attached to a mounting portion of the leaf spring member that intersects with the central axis, the load transmission member transmitting a load transmitted from the leaf spring member in response to the test load as the test load to the load detection unit; A verification device for a testing machine, comprising:

2. 2. The tester for a testing machine according to claim 1, wherein a bottom portion of the load transmission member facing the load generating portion is located closer to the leaf spring member than a bottom portion of the first annular member facing the load generating portion in the test state.

3. a plurality of first fastening members that fasten and fix the first annular member to the load generating portion; a plurality of second fastening members that fasten and fix the second annular member to the first annular member at positions offset from the positions of the plurality of first fastening members; 2. The verifier for a testing machine according to claim 1, further comprising:

4. 4. The proving device for a testing machine according to claim 3, wherein at least the second fastening members of the plurality of first fastening members and the plurality of second fastening members are a plurality of screws.

5. the plurality of first fastening members are a plurality of first screws that pass through the first annular member, the held portion of the leaf spring member, and the second annular member, and are screwed into a plurality of first screw holes provided in the load generating portion, thereby fastening and fixing the first annular member to the load generating portion; 5. The tester for a testing machine according to claim 4, wherein the plurality of second fastening members are a plurality of second screws that pass through the second annular member and the retained portions of the leaf spring member and are screwed into a plurality of second screw holes provided in the first annular member, thereby fastening and fixing the second annular member to the first annular member.

6. 6. The verifying device for a testing machine according to claim 5, wherein the plurality of first screws and the plurality of second screws are arranged on a surface of the second annular member opposite to the first annular member, so that the screw heads are arranged alternately on the same circumference surrounding the central axis.

7. 7. The tester for a testing machine according to claim 6, wherein the screw heads of the plurality of second screws are covered with caps after the second annular member is fastened to the first annular member, thereby preventing connection of a fastening tool.

8. The load transmission member is a first transmission member that is placed on a surface of the mounting portion of the leaf spring member that faces the load detection unit in the calibration state; a second transmission member that is superimposed on a surface of the mounting portion that faces the load generating portion in the testing state, with the mounting portion sandwiched between the second transmission member and the first transmission member; a plurality of third fastening members that fasten and fix the first transmission member and the second transmission member to each other with the mounting portion sandwiched between them; a reamer bolt having a head cylindrical portion and a tip threaded portion, the head cylindrical portion passing through a reamer bolt communicating hole that penetrates and communicates with the mounting portion from one of the first transmission member and the second transmission member to a midpoint in the thickness direction of the other member with a fit tolerance that is smaller than the positional deviation tolerance of the plurality of third fastening members, and the tip threaded portion being screwed into a reamer bolt threaded hole that is formed in the other member from the midpoint in the thickness direction to the reamer bolt communicating hole, thereby fastening and fixing the first transmission member and the second transmission member to each other with the mounting portions sandwiched therebetween; 8. The verifier for a testing machine according to claim 7, further comprising:

9. the plurality of third fastening members are a plurality of third screws that penetrate the one member and the mounting portion and are screwed into a plurality of third screw holes provided in the other member, thereby fastening and fixing the first transmission member and the second transmission member to each other with the mounting portion sandwiched therebetween, 9. The verifying device for a testing machine according to claim 8, wherein the fit tolerance is smaller than the positional deviation tolerance of the plurality of third screws.

10. the load transmission member indirectly transmits the test load to the load detection unit via an intermediate member formed separately from the load detection unit, the intermediate member is interposed between the load detection unit and the load transmission member in the test state so as to abut against the load transmission member with a convex curved surface that constitutes a part of a spherical surface, 9. The verifying device for a testing machine according to claim 8, wherein a concave curved surface into which the convex curved surface fits in the verifying state is formed on a surface of the first transmission member that faces the load detection unit in the verifying state, the concave curved surface intersecting the central axis.

11. A tester verification device according to any one of claims 1 to 10; The load testing machine; A load testing machine with a verification device, comprising:

12. an intermediate member formed separately from the load detection unit, and interposed between the load detection unit and the load transmission member in the testing state so as to abut against the load transmission member with a convex curved surface that constitutes a part of a spherical surface, thereby intermediate the indirect transmission of the testing load from the load transmission member to the load detection unit; 12. The load testing machine with a calibrator according to claim 11, wherein a concave curved surface into which the convex curved surface fits in the testing state is formed on a surface of the load transmission member that faces the load detection unit in the testing state, the concave curved surface intersecting the central axis.

13. The intermediate member is a spherical member having a portion of its surface as the convex curved surface that fits into the concave curved surface of the load transmitting member in the calibration state; a sphere receiving member attached to the load detection unit so as to be interposed between the spherical member fitted to the concave curved surface of the load transmission member and the load detection unit in the test state, the sphere receiving member having a surface facing the spherical member with a receiving concave curved surface into which another convex curved surface occupying a different position on the surface from the convex curved surface is fitted, the receiving concave curved surface being formed so as to intersect with the axis of the load generation unit; 13. The load testing machine with a verification device according to claim 12, further comprising:

14. The load-applied testing machine with a calibrator according to claim 13, characterized in that the intermediate member further comprises a plurality of fourth fastening members that fasten and fix the sphere receiving member to the load detection unit at a plurality of positions arranged in one or more concentric circles surrounding the receiving concave curved surface.

15. 15. The load-applied testing machine with a proving device according to claim 14, wherein the plurality of fourth fastening members are a plurality of fourth screws that pass through the sphere receiving member and are screwed into a plurality of fourth screw holes provided in the load detection unit, thereby fastening and fixing the sphere receiving member to the load detection unit.

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