Material testing machine

Abstract

To provide a material testing machine capable of operating functional components of the material testing machine while largely protecting the front of a test space of the material testing machine.SOLUTION: A material testing machine (1) includes a protective cover (40) disposed in front of a predetermined test space (S) and supported so as to be movable between a protective position (P1) and a retracted position (P2), and a functional component (21) provided at a position in the test space (S) not covered by the protective cover (40) at the protective position (P1), the material testing machine (1) further including a second protective cover (50) that covers the test space (S) from the front according to a position not covered by the protective cover (40), the second protective cover (50) is supported so as to be able to move between the second protection position (Q1) and the operation allowance position (Q1), which is retracted from the second protection position (Q2) and allows the worker to operate the functional component (21).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a materials testing machine. [Background technology]

[0002] Conventionally, there has been known a materials testing machine in which a protective cover for preventing scattering of a test specimen due to fracture during testing is provided in front of a predetermined test space. There are several types of opening and closing methods for such protective covers, one of which is a vertical sliding type (see, for example, Patent Document 1). Compared to other types such as single-door and double-door types, this vertical sliding type has the advantage that the operator does not need to move out of the way when opening and closing the cover, and furthermore, it has a mechanism that allows the cover to be stopped at any position, making it easier to operate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-8149 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with a vertically sliding protective cover, the cover size must be limited to less than half the height of the test space to ensure sufficient sliding stroke, making it impossible to cover the upper space above the center of the test space. Therefore, for example, when testing a specimen with a long elongation, the specimen may extend into the upper space of the test space, resulting in incomplete protection from flying specimens. To address this issue, a fixed cover could be used to cover the upper space. However, this upper space contains functional components that are operated by the operator from the front, such as a stroke limiter as a safety mechanism for the testing machine. A fixed cover would prevent access to the inside of the cover, making it impossible to operate these functional components. The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a materials testing machine that can largely protect the front of the testing space of the materials testing machine while also allowing the functional components of the materials testing machine to be operated. [Means for solving the problem]

[0005] An aspect of the present invention relates to a materials testing machine comprising: a protective cover arranged in front of a predetermined test space in which a test specimen is placed and a tensile load is applied to the test specimen, the protective cover being supported so as to be movable between a protective position that covers the test space from the front depending on the position of the test specimen at the start of the test and a retracted position that is retracted vertically from the protective position; and a functional component that is arranged in a position of the test space that is not covered by the protective cover in the protective position and is operated by an operator from the front, the materials testing machine comprising: a second protective cover that covers the test space from the front depending on the position of the functional component that is not covered by the protective cover in the protective position, and the second protective cover being supported so as to be movable between a second protective position that covers the test space from the front and an operation allowance position that is retracted from the second protective position and allows an operator to operate the functional component. [Effects of the Invention]

[0006] According to this aspect of the present invention, the front of the test space that is not covered by the protective cover positioned according to the position of the test specimen at the start of the test can be protected by the second protective cover. Furthermore, since the second protective cover is configured to be movable, it is also possible to operate the functional components that are located in the position protected by the second protective cover. Therefore, it is possible to provide a materials testing machine that largely protects the front of the test space of the materials testing machine while also allowing operation of the functional components of the materials testing machine. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of a materials testing machine according to a first embodiment. [Figure 2] FIG. 1 is a plan view of a material testing machine according to a first embodiment. [Figure 3] FIG. 2 is a front view of the scattering prevention unit according to the first embodiment. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view of a slide fixing portion of the upper cover. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4. [Figure 7] FIG. 10 is a front view of a shatterproof unit according to a second embodiment. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 2 is a perspective view of the periphery of an adsorption member of the adsorption mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0009] [1. First embodiment] Fig. 1 is a front view of a materials testing machine 1 according to the first embodiment. Fig. 2 is a plan view of the materials testing machine 1 according to the first embodiment. Note that in Fig. 1, some members are marked with dots for ease of explanation. The material testing machine 1 of this embodiment applies a test load as a test force to a test piece (test specimen) T, thereby measuring the tensile force and elongation of the test piece T.

[0010] The material testing machine 1 includes a testing device 10 and a control device 100 .

[0011] In this embodiment, a front-to-back direction FD (see FIG. 2), a width direction SD, and a top-to-bottom direction TD are used with reference to the testing apparatus 10 shown in FIG. 1. The width direction SD is also called the left-to-right direction.

[0012] The testing apparatus 10 has a table 11. A stage 12 is provided on top of the table 11. A support column 13 is provided on the stage 12, extending vertically upward. A pair of support columns 13 are provided in the width direction SD of the testing apparatus 10. A cross yoke 14 is provided on top of the support columns 13, extending between the pair of support columns 13. A threaded rod (not shown) is provided inside the support column 13. The threaded rod is composed of a ball screw. Both ends of a crosshead 15 are connected to the threaded rod via nuts (not shown). The crosshead 15 moves up and down relative to the stage 12 by rotation of the threaded rod. The threaded rod is rotated by a motor (not shown).

[0013] A load cell 16 is installed on the crosshead 15. A joint 17 is attached to the load cell 16. The joint 17 extends downward. An upper gripping tool 18 is connected to the lower end of the joint 17. The upper gripping tool 18 opens and closes in the width direction SD. The upper gripping tool 18 grips the upper end of the test piece T, which extends in the vertical direction.

[0014] A lower gripping tool 19 is disposed below the upper gripping tool 18. The lower gripping tool 19 is fixed to the upper surface of the stage 12 via a joint 20. The lower gripping tool 19 is configured similarly to the upper gripping tool 18, except that it is configured vertically symmetrical to the upper gripping tool 18. The lower gripping tool 19 grips the lower end of the test piece T, which extends in the vertical direction.

[0015] With the test piece T gripped by the upper gripping tool 18 and the lower gripping tool 19, the upper gripping tool 18 moves up and down together with the crosshead 15. As a result, a tensile load is applied as a test force to the test piece T gripped between the upper gripping tool 18 and the lower gripping tool 19. At this time, the load cell 16 measures the test force applied by the upper gripping tool 18 via the joint 17. A measurement signal from the load cell 16 is input to the control device 100.

[0016] A pair of upper and lower stroke limit sensors (functional components) 21, 22 are supported on the support 13. The stroke limit sensors 21, 22 are switch-type sensors. The stroke limit sensors 21, 22 are configured so that a rod attached to the crosshead 15 presses the stroke limit sensors 21, 22 when the crosshead 15 approaches a predetermined position. Whether or not the switches of the stroke limit sensors 21, 22 have been pressed is input to the control device 100. When the control device 100 receives input from the stroke limit sensors 21, 22 that the switches have been pressed, it stops the movement of the crosshead 15.

[0017] The stroke limit sensors 21, 22 are equipped with spring-loaded clamping portions. The stroke limit sensors 21, 22 are configured so that the clamping force can be released by gripping the clamping portions. The stroke limit sensors 21, 22 can be moved to a predetermined position in the vertical direction of the support 13 by operating the clamping portions. By changing the vertical positions of the stroke limit sensors 21, 22, it is possible to change the lifting range (movement range) of the crosshead 15.

[0018] FIG. 3 is a front view of the scattering prevention unit 30 according to the first embodiment. In the material testing machine of this embodiment, a shatter prevention unit 30 is arranged in front of the test space S. The shatter prevention unit 30 is fixed to, for example, the stage 12. The shatter prevention unit 30 has a pair of left and right frames (guide members) 31. The frames 31 extend along the support columns 13. In this embodiment, the frames 31 overlap the support columns 13 in a front view. In other words, the pair of left and right frames 31 are arranged outward in the left-right direction from the test space S. The test space S is a space in which a tensile load is applied to the test piece T. Specifically, the test space S is defined by a space surrounded by the stage 12, the pair of left and right support columns 13, and the cross yoke 14. An upper grip 18 and a lower grip 19 are arranged in the test space S, and the upper grip 18 is raised and lowered by the crosshead 15.

[0019] The frame 31 is made of, for example, aluminum. The frame 31 has a substantially rectangular prism-like cross section. Slots 32, 33, 34, and 35 (see FIGS. 6 and 8) extending along the frame 31 are formed on the four sides of the frame 31. Each slot 32, 33, 34, and 35 has a guide groove 32a, 33a, 34a, and 35a formed on the surface of the frame 31, and an internal groove 32b, 33b, 34b, and 35b that communicates with the guide groove 32a, 33a, 34a, and 35a and is wider than the guide groove 32a, 33a, and 34a.

[0020] In this embodiment, a lower cover (protective cover) 40 is supported in a vertically slidable manner in the front groove (first guide groove) 32 out of the four grooves 32, 33, 34, and 35 of the frame 31. In detail, the lower cover 40 is supported in the front groove 32 via a rail member 36 (see FIG. 5) that extends in the vertical direction.

[0021] The rail members 36 extend in the vertical direction. The rail members 36 are provided corresponding to the lower part of the frame 31. A pair of upper and lower sliders 37 are supported on the left and right rail members 36. The sliders 37 are supported on the rail members 36 so as to be slidable in the vertical direction. A lower cover 40 is supported in a state in which it straddles the upper, lower, left, and right sliders 37. In other words, the sliders 37 are attached to the four corners of the lower cover 40.

[0022] As a result, the lower cover 40 is supported so as to be movable between a lower position (protection position) P1 (see FIG. 1) that covers the front surface of the test piece T at the start of the test, and an upper position (retracted position) P2 (see FIG. 1) that is retracted above the lower position P1. In the upper position P2, for example, an operator can access the lower part of the test space S. Therefore, in this embodiment, when the lower cover 40 is moved to the upper position P2, an operator can set the test piece T between the upper gripping tool 18 and the lower gripping tool 19 from the front.

[0023] The lower cover 40 includes a rectangular plate-shaped cover main body 41. The cover main body 41 is formed, for example, from a transparent resin. A bridge member 42 extending in the left-right direction is supported at the bottom of the cover main body 41. A generally U-shaped handle 43 and a lever 44 are provided on the bridge member 42. The lever 44 is connected to a clamping mechanism (not shown). The clamping mechanism clamps the rail member 36 to secure the lower cover 40 to the rail member 36. When the handle 43 and the lever 44 are gripped, the lever 44 is actuated to release the clamp, allowing the cover main body 41 to move along the rail member 36. In other words, when the lever 44 is not operated, the lower cover 40 is clamped to the rail member 36, and the vertical position of the lower cover 40 is fixed.

[0024] A hanging unit 38 is supported at the upper end of the frame 31. In this embodiment, a pair of hanging units 38, one on each side, are provided. A wire (hanging member) 39 is housed in the hanging unit 38 so that it can be wound up. The wire 39 is configured to return into the hanging unit 38 by an elastic member, for example, a spring (not shown). The wire 39 is pulled downward from the hanging unit 38 and attached to the upper end of the lower cover 40. The hanging unit 38 applies a hanging force to the lower cover 40 that is offset by the weight of the lower cover 40. In other words, the hanging force is an upward force generated by an elastic member (not shown) that offsets the downward force of the lower cover 40 due to its own weight.

[0025] In this embodiment, the pair of left and right hanging units 38 exert their respective hanging forces, thereby applying a total hanging force to the lower cover 40 that cancels out the weight of the lower cover 40. The hanging units 38 make it easy for the lower cover 40 to stop at any position, achieving a so-called free stop. This allows work to be done without bearing the weight of the lower cover 40, making it easy for the worker to raise and lower the lower cover 40.

[0026] Fig. 4 is a front view of the upper cover 50. Fig. 5 is a perspective view of the slide fixing portion 52 of the upper cover 50. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. In this embodiment, of the four slots 32, 33, 34, 35 of the frame 31, the inner slot (second guide slot) 33 in the left-right direction supports an upper cover (second protective cover) 50 so as to be slidable in the up-down direction. The upper cover 50 includes a rectangular plate-shaped cover main body 51. The cover main body 51 is formed of, for example, transparent resin. Slide fixing portions 52 are supported at the four corners of the cover main body 51. The slide fixing portions 52 are slidably supported in the slots 33 of the frame 31.

[0027] More specifically, the slide fixing portion 52 has an L-shaped plate-shaped mounting bracket 53. The mounting bracket 53 has a base portion 53a fixed to the cover main body portion 51 and a bent portion 53b bent in the front-rear direction from the outer left-right ends of the base portion 53a.

[0028] A bolt hole 53b1 (see FIG. 6) is formed in the bent portion 53b. A bolt 54 extending in the left-right direction is inserted into the bolt hole 53b1. The bolt 54 has a head 54a and a threaded portion 54b extending from the head 54a. A cylindrical spacer 55 is attached to the threaded portion 54b. The threaded portion 54b and the spacer 55 pass through the guide groove 33a of the slot 33 and enter the internal groove 33b. A nut 56 is fastened to the threaded portion 54b. The nut 56 is formed with a protrusion 56a that fits into the guide groove 33a. The protrusion 56a is, for example, angular. When the bolt 54 is tightened, the nut 56 in the internal groove 33b is tightened.

[0029] At this time, the spacer 55 prevents the frame 31 from being clamped between the nut 56 and the head 54a of the bolt 54, specifically, between the nut 56 and the mounting bracket 53. Therefore, the frame 31 and the mounting bracket 53 are not in close contact, and the upper cover 50 is supported solely by the friction between the nut 56 and the frame 31. That is, the position of the upper cover 50 is fixed solely by the abutting force of the nut 56, in other words, the frictional force generated by the clamping force between the pair of left and right frames 31. Therefore, the nut 56 can move within the slot 33 of the frame 31, allowing the upper cover 50 to slide easily. The upper cover 50 is configured to be movable between a second protection position Q1 (see FIG. 1 ), which covers the vertical center of the test space S from the front, and an operation-permitted position Q2 (see FIG. 1 ), which is above the second protection position Q1. The operation-permitted position Q2 may be located below the second protection position Q1.

[0030] In this embodiment, a frictional force increasing part 57 is attached to the nut 56. The frictional force increasing part 57 is made of, for example, plastic (resin). The frictional force increasing part 57 is a part that increases the contact area of ​​the slide fixing part 52 with the frame 31. The frictional force increasing part 57 increases the area of ​​the frame 31 on which the contact force of the nut 56 acts. This makes it possible to increase the frictional force, and the position of the upper cover 50 can be reliably fixed.

[0031] In this embodiment, the balance between the protruding amount of the spacer 55 and the frictional force increasing part 57 makes it easy to achieve both fixability and mobility of the upper cover 50.

[0032] As shown in Fig. 1, the materials testing machine 1 is provided with a control device 100 that controls each part of the materials testing machine 1. The control device 100 is connected to the materials testing machine 1 so as to be able to send and receive signals to and from the materials testing machine 1. The signals received by the control device 100 include measurement signals output by the load cell 16, signals output by the stroke limit sensors 21 and 22, and other appropriate signals required for control and testing. The signals transmitted by the control device 100 include control signals for a threaded rod motor (not shown), and other appropriate signals required for control and testing.

[0033] The control device 100 includes a computer, which includes a processor such as a CPU (Central Processing Unit) or MPU (Micro-Processing Unit), a memory device such as a ROM (Read Only Memory) or RAM (Random Access Memory), a storage device such as an HDD (Hard Disk Drive) or SSD (Solid State Drive), and an interface circuit for connecting the control device 100 and various peripheral devices. The processor executes a control program stored in the memory device or storage device, thereby realizing various functions of the materials testing machine 1.

[0034] Next, the operation of this embodiment will be described. In the testing apparatus 10, the operator moves the lower cover 40 to the upper position P2. Then, the upper and lower ends of the test piece T are gripped by the upper gripping tool 18 and the lower gripping tool 19 and set. After the test piece T is set between the upper gripping tool 18 and the lower gripping tool 19, the operator moves the lower cover 40 to the lower position P1. This causes the front surface of the test piece T to be covered by the lower cover 40. In this state, the crosshead 15 is raised and a tensile load is applied to the test piece T.

[0035] Here, depending on the test specimen T, the test specimen T may stretch significantly and break above the lower cover 40 at the lower position P1. In this embodiment, the upper cover 50 is provided above the lower cover 40, so even if the test specimen T breaks at a height that cannot be prevented by the lower cover 40, the test specimen T can be prevented from flying out or scattering forward of the test space S.

[0036] Furthermore, by retracting the upper cover 50 to the operation permitted position Q2, the operator can access the stroke limit sensor 21, which is covered by the upper cover 50 in the second protection position Q1, from the front. Therefore, the position of the stroke limit sensor 21 can be changed even with the upper cover 50 in place. Because the stroke limit sensor 21 is not a component that is moved frequently, a simple configuration in which it is moved by pushing it, as in this embodiment, is suitable for the upper cover 50.

[0037] [2. Second Embodiment] Next, a second embodiment will be described. Note that the same components as those in the first embodiment will be given the same reference numerals, and the description thereof may be omitted.

[0038] FIG. 7 is a front view of a scattering prevention unit 230 according to the second embodiment. The material testing machine 1 of the second embodiment has a scattering prevention unit 230 instead of the scattering prevention unit 30 of the first embodiment.

[0039] The second embodiment of the anti-scattering unit 230 differs from the first embodiment of the anti-scattering unit 30 in that it has a lower cover (protective cover) 240 instead of the lower cover 40 of the first embodiment, and in that it has an additional suction mechanism 200.

[0040] In comparison with the lower cover 40 of the first embodiment, the lower cover 240 does not have the lever 44 and the clamp mechanism linked to the lever 44. That is, instead of being fixed by a clamp mechanism, the lower cover 240 of the second embodiment is held in position by the hanging force exerted by the pair of left and right hanging units 38 and the suction force of the suction mechanism 200.

[0041] The suction mechanism 200 is provided along the frame 31. In this embodiment, the suction mechanism 200 is provided only on one side in the width direction SD. Therefore, compared to when the suction members 220 are provided on both sides in the width direction SD, the number of parts can be reduced and the assembly work can be made easier. The attraction mechanism 200 is configured to use magnetic force, which allows for a simple attraction configuration of the attraction mechanism 200. Specifically, the attraction mechanism 200 has an iron plate (attached portion, magnetic body) 210 extending in the vertical direction along the frame 31, and an attraction member 220 that is attracted to the iron plate 210 by magnetic force.

[0042] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. The iron plate 210 is fixed to one side of the frame 31. The iron plate 210 is fixed to the frame 31 at the top and bottom by bolts (fixing members) 211 and nuts (fixing members) 212. In detail, the iron plate 210 is fixed to the frame 31 by fixing the bolt 211 and the nut 212 to the outer slot (third guide slot) 35 in the left-right direction among the four slots 32, 33, 34, 35 of the frame 31.

[0043] FIG. 9 is a perspective view of the periphery of the adsorption member 220 of the adsorption mechanism 200. As shown in FIG. The attraction member 220 is disposed so as to face the iron plate 210. The attraction member 220 is supported by the cover main body 41 of the lower cover 240. In this embodiment, the attraction member 220 is supported at the vertical center of the outer left-right ends of the cover main body 41.

[0044] The attraction member 220 has an L-shaped mounting bracket 221. The mounting bracket 221 has a base 221a fixed to the cover main body 41 and a bent portion 221b bent in the front-rear direction from the outer left-right end of the base 221a. The bent portion 221b is bent so as to face the iron plate 210.

[0045] The base 221a is fixed to the cover main body 41 by a fixture 222. A magnet (attraction member main body) 223 is fixed to the iron plate 210 side of the bent portion 221b. The magnet 223 is housed in a resin cover holder 224. The cover holder 224 is fixed to the bent portion 221b of the mounting bracket 221 by a fixture 225. The magnet 223 comes into contact with and is attracted to the iron plate 210 via the cover holder 224.

[0046] The attractive force generated between magnet 223 and iron plate 210 may be smaller than the hanging force of hanging unit 38. In this embodiment, a magnet that generates an attractive force that will prevent lower cover 240 from suddenly dropping even if the hanging force of one of wires 39 of the pair of left and right hanging units 38 does not act, for example, even if one of wires 39 breaks, is selected as magnet 223.

[0047] Next, the operation of this embodiment will be described. In this embodiment, as in the first embodiment, an upper cover 50 is provided above the lower cover 240. Therefore, even if the test piece T breaks at a height that cannot be prevented by the lower cover 240, the test piece T can be prevented from flying out or scattering forward in the test space S, as in the first embodiment. Also in this embodiment, as in the first embodiment, the position of the stroke limit sensor 21 can be changed even if the upper cover 50 is provided.

[0048] In particular, in this embodiment, the vertical position of the lower cover 240 is maintained by the hanging unit 38 and the attraction mechanism 200. That is, the hanging unit 38 allows the lower cover 240 to freely stop. Furthermore, the position of the lower cover 240 is maintained because a magnetic attraction force is constantly acting between the attraction member 220 and the iron plate 210. In this embodiment, the lower cover 240 can be easily moved in the vertical direction simply by applying a vertical force to the lower cover 240 that exceeds the frictional force caused by the attraction force, thereby improving the workability when changing the position of the lower cover 240.

[0049] Furthermore, even if wire 39 were to break due to deterioration over time or the like, the suction force of suction mechanism 200 would act to prevent lower cover 240 from suddenly dropping.

[0050] Furthermore, when the magnet 223 of the adsorption member 220 comes into direct contact with the iron plate 210, the sliding of the magnet 223 and the iron plate 210 tends to generate metallic sounds. However, in this embodiment, the magnet 223 slides via the resin cover holder 224, which also prevents the generation of metallic sounds.

[0051] It is possible to reduce the falling speed of the lower cover 240 even if the wires 39 of the hanging units 38 on both sides break simultaneously by increasing the number of magnets or using stronger magnets. However, improving the attraction force increases the sliding resistance during normal operation when sliding the lower cover 240, which can easily impair workability. Furthermore, in reality, it is difficult to imagine a situation in which the wires 39 of the hanging units 38 on both sides break simultaneously. Therefore, in this embodiment, the lower cover 240 is configured to prevent a sudden fall in response to the case in which the wires 39 on one side do not function.

[0052] [3. Modifications] The above-described embodiment merely exemplifies one aspect of the present invention, and any modifications and applications are possible without departing from the spirit of the present invention.

[0053] In the above embodiment, the upper cover 50 is configured as a sliding type, but the upper cover 50 may be a hinged door.

[0054] In the above-described embodiment, the stroke limit sensor 21 is described as an example of a functional part and an example of an operated member, but the functional part or operated member may be, for example, a recording camera, or any functional part used in testing.

[0055] In the above-described embodiment, the frictional force increasing part 57 is provided, but the frictional force increasing part 57 may be omitted.

[0056] In the above-described embodiment, the lower covers 40, 240 are suspended and supported by the suspension unit 38. However, they may be suspended by a wire, pulley, or balancer weight instead of the suspension unit 38. That is, a rotatable pulley may be provided on the upper part of the frame 31, the lower covers 40, 240 are connected and supported at one end of a wire wound around the pulley, and a balancer weight that offsets the weight of the lower covers 40, 240 may be provided at the other end of the wire.

[0057] In the above-described first embodiment, a configuration in which the suction mechanism 200 is not provided has been described, but the first embodiment may also be provided with the suction mechanism 200. In other words, in the second embodiment, a configuration in which the lever 44 and the clamp mechanism are omitted has been described, but the lever 44 and the clamp mechanism may also be provided in the second embodiment.

[0058] In the second embodiment described above, the structure of the aluminum frame in which the frame 31 is made of aluminum and the iron plate 201 is attached as the magnetic part has been described, but the frame may be made of a magnetic material, for example, iron, and the frame itself may be made of a magnetic material. In other words, the guide member and the attracted part do not need to be separate bodies.

[0059] [4. Aspects] It will be understood by those skilled in the art that the exemplary embodiments and variations described above are examples of the following aspects.

[0060] (Section 1) A materials testing machine according to one embodiment comprises a protective cover arranged in front of a predetermined test space in which a test specimen is placed and a tensile load is applied to the test specimen, the protective cover being supported so as to be movable between a protective position in which the test space is covered from the front depending on the position of the test specimen at the start of the test and a retracted position in which the protective position is retracted vertically from the protective position, and a functional component arranged in a position of the test space that is not covered by the protective cover in the protective position and that is operated by an operator from the front, the materials testing machine also comprising a second protective cover that covers the test space from the front depending on the position in the protective position that is not covered by the protective cover, and the second protective cover may be supported so as to be movable between a second protective position in which the test space is covered from the front and an operation allowance position in which the second protective cover is retracted from the second protective position to allow an operator to operate the functional component.

[0061] According to the materials testing machine described in paragraph 1, the front of the test space that is not covered by the protective cover that is positioned according to the position of the test specimen at the start of the test can be protected by the second protective cover. In addition, because the second protective cover is configured to be movable, it is also possible to operate the functional components that are located in the position protected by the second protective cover. Therefore, it is possible to provide a materials testing machine that largely protects the front of the test space of the materials testing machine while also allowing operation of the functional components of the materials testing machine.

[0062] (Section 2) In the materials testing machine described in paragraph 1, the second protective cover may be supported so as to be slidable in the up-down direction.

[0063] According to the material testing machine described in paragraph 2, it is possible to eliminate the need for an operator to move their body away from the second protective cover when moving it.

[0064] (Section 3) In the materials testing machine described in paragraph 2, the protective cover and the second protective cover may be supported so as to be able to overlap each other in a front view.

[0065] According to the material testing machine described in paragraph 3, the protective cover and the second protective cover can be arranged compactly.

[0066] (Section 4) In the material testing machine described in paragraph 2 or 3, a guide member that slidably supports the second protective cover may be provided, and the second protective cover may be configured to be able to fix its position on the guide member by frictional force.

[0067] According to the material testing machine described in item 4, the position of the second protective cover can be fixed with a simple configuration.

[0068] (Section 5) In the material testing machine described in paragraph 4, a pair of guide members extending in the vertical direction may be provided, the second protective cover may be supported across the pair of guide members, and the second protective cover may generate the friction force by a clamping force in the direction between the pair of guide members.

[0069] According to the material testing machine described in paragraph 5, the structure is simple and the position is fixed by frictional force, while slidability can be easily ensured.

[0070] (Section 6) The material testing machine described in paragraph 1 may be provided with a guide member that supports the protective cover so that it can slide in the vertical direction, a hanging member that suspends and supports the protective cover and applies to the protective cover a hanging force corresponding to the weight of the protective cover, an adsorbed portion that extends along the guide member, and an adsorbing member that is provided on the protective cover and adsorbs to the adsorbed portion.

[0071] According to the material testing machine of paragraph 6, by supporting the protective cover by the hanging force and the suction force, the protective cover can be easily moved up and down simply by applying a vertical force to the protective cover, improving the workability when changing the position of the protective cover. Furthermore, even if the hanging member stops functioning, the suction force of the suction member can prevent the protective cover from suddenly falling.

[0072] (Section 7) The material testing machine described in paragraph 6 may comprise a pair of the guide members in the width direction and a pair of the hanging members in the width direction, and the suction member may be provided on only one side in the width direction.

[0073] According to the materials testing machine of item 7, by suppressing the application of excessive suction force, it is possible to reduce resistance when moving the position of the protective cover and improve the workability when changing the position of the protective cover. Furthermore, compared to when suction members are provided on both sides in the width direction, it is possible to reduce the number of parts of the materials testing machine and to simplify the assembly work of the materials testing machine.

[0074] (Section 8) In the material testing machine described in paragraph 7, the pair of hanging members may both apply a hanging force to the protective cover corresponding to the weight of the protective cover, and the suction member may be attached to the suction target portion with an adhesive force corresponding to the hanging force of one of the hanging members.

[0075] According to the material testing machine of paragraph 8, by dealing with the realistic case where only one of the hanging members does not function, it is possible to prevent the protective cover from suddenly falling while ensuring the operability of the protective cover.

[0076] (Section 9) In the materials testing machine according to any one of paragraphs 6 to 8, the attraction member may include a magnet, and the attracted part may be a magnetic body.

[0077] According to the material testing machine of the ninth aspect, the structure of the suction member that is suctioned to the suction target portion can be easily realized. [Explanation of symbols]

[0078] 1. Material testing machine 21 Stroke limit sensor (functional part) 31 Frame (guide member) 39 Wire (hanging member) 40 Lower cover (protective cover) 50 Upper cover (second protective cover) 210 Iron plate (attached part, magnetic material) 220 Adsorption member 223 Magnet 240 Lower cover (protective cover) P1 Lower position (protected position) P2 Upper position (retreat position) Q1 Second protection position Q2 Allowable operation position S Test Space T test piece (test specimen)

Claims

1. A materials testing machine comprising: a protective cover disposed in front of a predetermined test space in which a test specimen is placed and a tensile load is applied to the test specimen, the protective cover being supported so as to be movable between a protective position in which the protective cover covers the test space from the front depending on the position of the test specimen at the start of a test and a retracted position in which the protective cover is retracted vertically from the protective position; and a functional part disposed in a position in the test space not covered by the protective cover in the protective position and operated by an operator from the front, a second protective cover that covers the test space from the front depending on the position of the protective position where the test space is not covered by the protective cover; the second protective cover is supported movably between a second protective position that covers the test space from the front and an operation allowable position that retreats from the second protective position and allows an operator to operate the functional component. Material testing machine.

2. The second protective cover is supported so as to be slidable in the up and down direction.

2. The material testing machine according to claim 1.

3. The protective cover and the second protective cover are supported so as to be overlappable in a front view.

3. A material testing machine according to claim 2.

4. a guide member that slidably supports the second protective cover, The second protective cover is configured to be able to be fixed in position to the guide member by frictional force.

4. A material testing machine according to claim 2 or 3.

5. A pair of the guide members extending in the vertical direction is provided, The second protective cover is supported across the pair of guide members, the second protective cover generates the frictional force by a clamping force in a direction between the pair of guide members; 5. A material testing machine according to claim 4.

6. a guide member that supports the protective cover so that the protective cover can slide in the up and down direction; a hanging member that suspends and supports the protective cover, the hanging member applying a hanging force corresponding to the weight of the protective cover to the protective cover; a suction target portion extending along the guide member; an adsorption member provided on the protective cover and adsorbed to the adsorbed portion, 2. The material testing machine according to claim 1.

7. A pair of the guide members in the width direction; a pair of the hanging members in the width direction, The suction member is provided only on one side in the width direction.

7. A material testing machine according to claim 6.

8. The pair of hanging members together impart a hanging force corresponding to the weight of the protective cover to the protective cover, The suction member is attached to the suction target portion with an adhesive force corresponding to the suspending force of one of the suspending members.

8. A material testing machine according to claim 7.

9. the attraction member includes a magnet, The attracted part is made of a magnetic material.

9. A material testing machine according to claim 6.

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