A bending test support device and a bending testing machine

Abstract

The application discloses a bending test support device and a bending test machine, and belongs to the technical field of bending test. The bending test support device is used for supporting a test sample. The central axis of a transmission shaft is rotationally connected to a rack. Spiral grooves are formed in transmission members. The spiral groove of one transmission member is threadedly matched with a first transmission thread. The spiral groove of another transmission member is threadedly matched with a second transmission thread. Each group of support members comprises two support members. The support members have arc-shaped support surfaces for supporting the test sample. The arc outer diameters of the arc-shaped support surfaces of different groups of support members are different. The two support members are respectively and detachably installed on the two transmission members, so that the replacement difficulty of the arc-shaped support surfaces can be reduced. The bending test machine is applied with the bending test support device, so that the mechanical property of the test sample can be evaluated, and the long-term stability and consistency of the bending test machine can be ensured.

Description

Technical Field

[0001] This application relates to the field of bending testing technology, specifically to a bending testing support device and a bending testing machine. Background Technology

[0002] Before being put into practical application during the material research and development stage, it is necessary to prepare test specimens and evaluate their mechanical properties using a bending testing machine. During testing, one end of the specimen is fixed by a support structure, while the other end is subjected to a load to bend it, in order to determine its bending strength, modulus, and other mechanical property parameters. Subsequently, repeated bending fatigue tests are required to evaluate the material's fracture toughness and fatigue life.

[0003] To avoid the adverse effects of stress concentration on test accuracy (such as premature yielding or non-representative fracture) and specimen fatigue life (leading to premature failure), specimens are usually supported by arc-shaped support surfaces, which can effectively disperse contact stress and improve the accuracy of test data.

[0004] However, specimens of different thicknesses require support surfaces with different outer diameters. In the existing technology, support frames are often used to support the specimens. These support frames are usually fixedly installed on the body of the bending testing machine. When it is necessary to use support surfaces with different outer diameters to support the specimens, the entire support frame needs to be disassembled and replaced, which is inconvenient. Moreover, repeated disassembly and assembly may lead to a decrease in the accuracy of the installation reference surface or loosening of bolt connections. This cannot meet the strict requirements of some international testing standards (such as some standards that require the support system to have high stability and maintenance-free operation) for the long-term stability and consistency of the testing device.

[0005] Therefore, there is an urgent need for a bending test support device and a bending test machine to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this invention is to provide a bending test support device and a bending test machine that can reduce the difficulty of replacing the arc-shaped support surface and ensure the long-term stability and consistency of the bending test machine when applied to it.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In a first aspect, a bending test support device is provided for supporting a specimen, the bending test support device comprising:

[0009] frame;

[0010] A drive shaft, the central axis of which is rotatably connected to the frame, and the peripheral sidewall of the drive shaft is provided with a first drive thread and a second drive thread that are coaxially arranged with opposite directions of rotation.

[0011] Two transmission components are provided, each having a spiral groove. The spiral groove of one transmission component is threaded into the first transmission thread, and the spiral groove of the other transmission component is threaded into the second transmission thread. The transmission shaft rotates to allow the two transmission components to approach or move away from each other.

[0012] Multiple sets of support members, each set of support members including two support members, each support member having an arc-shaped support surface for supporting the sample, the outer diameter of the arc-shaped support surface of the support members in different sets of support members is different, and the two support members are respectively detachably installed on the two transmission members.

[0013] In some embodiments, a first scale is provided on the frame along the length direction of the transmission shaft, and the first scale is provided corresponding to the transmission component.

[0014] In some embodiments, the transmission member is provided with a pointer facing the first scale.

[0015] In some embodiments, the bending test support device further includes a limiting component for limiting the movement of the two transmission members away from each other.

[0016] In some embodiments, the limiting component includes a first limiting member and a second limiting member, both of which are fixedly connected to the frame and located on both sides of the two transmission members respectively.

[0017] In some embodiments, the first limiting member is detachably connected to the frame; the second limiting member is detachably connected to the frame.

[0018] In some embodiments, the support member has a first connecting hole, and the transmission member has a first fixing hole. The support member is installed on the transmission member by a locking member passing through the first connecting hole and engaging with the first fixing hole.

[0019] In some embodiments, the bending test support device further includes a handwheel, which is coaxially connected to one end of the drive shaft.

[0020] In some embodiments, the transmission member has a positioning groove, and the support member has a positioning part, wherein the positioning groove and the positioning part are engaged.

[0021] In a second aspect, a bending testing machine is provided, characterized in that it includes a machine body, a pressing device, and the aforementioned bending test support device, wherein the pressing device and the bending test support device are both mounted on the machine body, the bending test support device is used to support the specimen, and the pressing device is used to press down on the specimen.

[0022] The beneficial effects of this application are as follows:

[0023] The bending test support device provided in this application is rotatably connected to the frame via the central axis of a drive shaft. The drive shaft has a first drive thread and a second drive thread arranged coaxially with opposite directions of rotation on its peripheral sidewall. The helical groove of one drive component engages with the first drive thread, and the helical groove of the other drive component engages with the second drive thread. Rotation of the drive shaft allows the two drive components to approach or move away from each other. Support components are mounted on the drive components, enabling the drive shaft to be rotated to adjust the span between the two support components during mechanical performance evaluation. By setting multiple sets of support components, each set including two support components, each support component has an arc-shaped support surface for supporting the specimen. The outer diameter of the arc-shaped support surface differs between different sets of support components. The two support components are detachably mounted on two corresponding drive components, thereby reducing the difficulty of replacing the arc-shaped support surface and ensuring the long-term stability and consistency of the bending test machine when applied to it.

[0024] The bending testing machine provided in this application includes a machine body, a pressing device, and the aforementioned bending test support device. Both the pressing device and the bending test support device are installed on the machine body. The bending test support device is used to support the specimen, and the pressing device is used to press down on the specimen, thereby enabling the mechanical property evaluation of the specimen and ensuring the long-term stability and consistency of the bending testing machine. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the bending test support device provided in the embodiments of this application.

[0027] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0028] Figure label:

[0029] 1. Frame; 11. First scale;

[0030] 2. Drive shaft; 21. First drive thread; 22. Second drive thread;

[0031] 3. Transmission components; 31. Pointer; 32. Positioning groove;

[0032] 4. Support component; 41. Arc-shaped support surface; 42. First connecting hole; 43. Positioning part;

[0033] 5. Handwheel;

[0034] 61. First limiting component; 62. Second limiting component. Detailed Implementation

[0035] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0036] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0038] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0039] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0040] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0041] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0042] Figure 1 A schematic diagram of the bending test support device provided in this embodiment is shown. Figure 1As shown, the bending test support device provided in this embodiment is used to support the specimen prepared from the material. The bending test support device includes a frame 1, a drive shaft 2, two drive components 3, and multiple sets of support components 4; the central axis of the drive shaft 2 is rotatably connected to the frame 1, and the peripheral sidewall of the drive shaft 2 is provided with a first drive thread 21 and a second drive thread 22 with opposite directions of rotation and coaxial arrangement; the drive components 3 are provided with helical grooves, one drive component 3 has a helical groove that is threadedly engaged with the first drive thread 21, and the other drive component 3 has a helical groove that is threadedly engaged with the second drive thread 22, and the drive shaft 2 can rotate to make the two drive components 3 approach or move away from each other; each set of support components 4 includes two support components 4, and the support component 4 has an arc-shaped support surface 41 for supporting the specimen. The arc-shaped support surface 41 of different sets of support components 4 has a different outer diameter, and the two support components 4 are respectively detachably installed on the two drive components 3. Specifically, the frame 1 is provided with two lead screw support seats. One end of the drive shaft 2 extends into the mounting hole of one lead screw support seat, and the other end of the drive shaft 2 extends into the mounting hole of the other lead screw support seat, thereby realizing the rotational connection of the central axis of the drive shaft 2 relative to the frame 1.

[0043] The bending test support device provided in this embodiment is rotatably connected to the frame 1 via the central axis of the transmission shaft 2. The peripheral wall of the transmission shaft 2 is provided with a first transmission thread 21 and a second transmission thread 22 with opposite directions of rotation and coaxial arrangement. The helical groove of one transmission component 3 is threadedly engaged with the first transmission thread 21, and the helical groove of the other transmission component 3 is threadedly engaged with the second transmission thread 22. The rotation of the transmission shaft 2 can bring the two transmission components 3 closer to or further away from each other. The support component 4 is installed on the transmission component 3, so that the span between the two support components 4 can be adjusted by rotating the transmission shaft 2 during mechanical performance evaluation. By setting multiple sets of support components 4, each set of support components 4 includes two support components 4. The support component 4 has an arc-shaped support surface 41 for supporting the specimen. The arc-shaped support surface 41 of different sets of support components 4 has a different outer diameter. The two support components 4 are respectively detachably installed on the two transmission components 3, thereby reducing the difficulty of replacing the arc-shaped support surface 41 and ensuring the long-term stability and consistency of the bending test machine when it is applied to the bending test machine.

[0044] Continue as Figure 1 As shown, the support member 4 has a first connecting hole 42, and the transmission member 3 has a first fixing hole. A locking member passes through the first connecting hole 42 and engages with the first fixing hole to install the support member 4 onto the transmission member 3. Specifically, the first connecting hole 42 is a through hole, the first fixing hole is a threaded hole, and the first locking member is a bolt. The bolt passes through the through hole and engages with the threaded hole, thus allowing the support member 4 to be detachably installed onto the transmission member 3.

[0045] Continue as Figure 1As shown, the bending test support device also includes a handwheel 5, which is coaxially connected to one end of the drive shaft 2. This allows the operator to adjust the span between the two arc-shaped support surfaces 41 by rotating the handwheel 5, reducing the operator's workload during repeated span adjustments for bending fatigue testing. Specifically, the handwheel 5 has a keyway mounting hole, and one end of the drive shaft 2 extends into this mounting hole and also has a keyway. A connector engages with both keyways, thus coaxially connecting the handwheel 5 to one end of the drive shaft 2.

[0046] In some embodiments, a second scale is provided at the connection position between the handwheel 5 and the drive shaft 2, so that the operator can observe the value of the second scale relative to the position of the frame 1, know the rotation scale of the drive shaft 2 to know the displacement distance of the transmission component 3, and then accurately adjust the span between the two arc-shaped support surfaces 41.

[0047] Figure 2 It shows Figure 1 A magnified view of a portion of point A in the diagram. (See diagram below.) Figure 2 Combination Figure 1 As shown, a first scale 11 is provided on the frame 1 along the length of the drive shaft 2. The first scale 11 is set corresponding to the transmission component 3, so that the operator can directly know the span between the two arc-shaped support surfaces 41 based on the scale difference between the two transmission components 3 and the first scale 11. It should be noted that the setting method of the first scale 11 is not limited here. It can be directly engraved or printed on the frame 1, or it can be made into a nameplate and fixedly connected to the frame 1.

[0048] Preferably, the transmission component 3 is provided with a pointer 31 facing the first scale 11, so that the operator can accurately read the scale value of the first scale 11 corresponding to the transmission component 3.

[0049] Because the machining cost of the first transmission thread 21 and the second transmission thread 22 on the transmission component 3 is high, the length of the transmission thread should be shortened as much as possible while meeting the actual span requirements between the two transmission components 3. However, during the process of the transmission shaft 2 rotating and causing the two transmission components 3 to move away from each other, if the helical groove of the transmission component 3 directly disengages from the transmission thread, the threaded connection between the transmission component 3 and the transmission shaft 2 will fail, requiring disassembly of the transmission component 3 for repair. To prevent the helical groove of the transmission component 3 from directly disengaging from the transmission thread, such as... Figure 1As shown, the bending test support device also includes a limiting component, which limits the movement of the two transmission components 3 away from each other, thereby preventing the two transmission components 3 from moving too far apart and causing the helical groove of the transmission component 3 to disengage from the transmission thread. Specifically, the limiting component includes a first limiting member 61 and a second limiting member 62, both of which are fixedly connected to the frame 1 and located on both sides of the two transmission components 3 respectively. It should be noted that the specific structure of the first limiting member 61 and the second limiting member 62 in this embodiment is not limited. They can be limiting blocks or limiting baffles, or proximity switches or photoelectric switches. When the first limiting member 61 and the second limiting member 62 are limiting blocks or limiting baffles, they can directly block the movement of the transmission members 3 away from each other. When the first limiting member 61 and the second limiting member 62 are proximity switches or photoelectric switches, the first limiting member 61 and the second limiting member 62 are respectively connected to a buzzer. Thus, when the limiting member triggers the proximity switch or photoelectric switch, the proximity switch or photoelectric switch can send a signal to make the buzzer alarm, so as to remind the staff that the arc-shaped support surface 41 of the two transmission members 3 has reached the maximum span position.

[0050] Preferably, the first limiting member 61 and the second limiting member 62 are detachably connected to the frame 1, thereby allowing for flexible adjustment of the positions of the first limiting member 61 and the second limiting member 62 on the frame 1, and thus adjusting the maximum span between the two arc-shaped support surfaces 41. Specifically, the first limiting member 61 has a second connecting hole, and the frame 1 has a second fixing hole. The first limiting member 61 is detachably connected to the frame 1 by a second locking member passing through the second connecting hole and engaging with the second fixing hole. The second limiting member 62 has a third connecting hole, and the frame 1 has a third fixing hole. The second limiting member 62 is detachably connected to the frame 1 by a third locking member passing through the third connecting hole and engaging with the third fixing hole.

[0051] In this embodiment, the second connecting hole is a through hole, the second fixing hole is a threaded hole, and the second locking member is a bolt. The bolt passes through the through hole and engages with the threaded hole, thereby detachably connecting the first limiting member 61 to the frame 1; the third connecting hole is a through hole, the third fixing hole is a threaded hole, and the third locking member is a bolt. The bolt passes through the through hole and engages with the threaded hole, thereby detachably connecting the second limiting member 62 to the frame 1.

[0052] Continue as Figure 1As shown, the transmission component 3 has a positioning groove 32, and the support component 4 has a positioning part 43. The positioning groove 32 and the positioning part 43 are engaged to improve the stability of the connection between the transmission component 3 and the support component 4, preventing relative displacement between the transmission component 3 and the support component 4 during mechanical performance evaluation, which could adversely affect the evaluation. Specifically, the positioning part 43 can be a positioning block, which engages with the positioning groove 32 to improve the stability of the connection between the transmission component 3 and the support component 4.

[0053] This embodiment also provides a bending testing machine, including a machine body, a pressing device, and the aforementioned bending test support device. Both the pressing device and the bending test support device are installed on the machine body. The bending test support device is used to support the specimen, and the pressing device is used to press down on the specimen, thereby enabling the mechanical property evaluation of the specimen and ensuring the long-term stability and consistency of the bending testing machine.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A bending test support device for supporting a specimen, characterized in that, The bending test support device includes: Rack (1); A drive shaft (2) is rotatably connected to the frame (1) along its central axis. The drive shaft (2) has a first drive thread (21) and a second drive thread (22) with opposite directions of rotation and coaxial arrangement on its peripheral sidewall. Two transmission components (3) are provided with spiral grooves. The spiral groove of one transmission component (3) is threaded with the first transmission thread (21), and the spiral groove of the other transmission component (3) is threaded with the second transmission thread (22). The transmission shaft (2) rotates so that the two transmission components (3) can approach or move away from each other. Multiple sets of support members (4), each set of support members (4) includes two support members (4), each support member (4) has an arc-shaped support surface (41) for supporting the sample, the arc-shaped support surface (41) of different sets of support members (4) has a different arc outer diameter, and the two support members (4) are respectively detachably installed on the two transmission members (3).

2. The bending test support device according to claim 1, characterized in that, A first scale (11) is provided on the frame (1) along the length direction of the transmission shaft (2), and the first scale (11) is provided corresponding to the transmission component (3).

3. The bending test support device according to claim 2, characterized in that, The transmission component (3) is provided with a pointer (31) facing the first scale (11).

4. The bending test support device according to claim 1, characterized in that, The bending test support device also includes a limiting component for limiting the movement of the two transmission members (3) away from each other.

5. The bending test support device according to claim 4, characterized in that, The limiting component includes a first limiting member (61) and a second limiting member (62), both of which are fixedly connected to the frame (1) and located on both sides of the two transmission members (3).

6. The bending test support device according to claim 5, characterized in that, The first limiting member (61) is detachably connected to the frame (1); the second limiting member (62) is detachably connected to the frame (1).

7. The bending test support device according to any one of claims 1-6, characterized in that, The support member (4) has a first connecting hole (42), and the transmission member (3) has a first fixing hole. The support member (4) is installed on the transmission member (3) by a locking member passing through the first connecting hole (42) and cooperating with the first fixing hole.

8. The bending test support device according to any one of claims 1-6, characterized in that, The bending test support device also includes a handwheel (5), which is coaxially connected to one end of the transmission shaft (2).

9. The bending test support device according to any one of claims 1-6, characterized in that, The transmission component (3) is provided with a positioning groove (32), and the support component (4) is provided with a positioning part (43). The positioning groove (32) and the positioning part (43) are engaged.

10. A bending testing machine, characterized in that, The device includes a body, a pressing device, and a bending test support device as described in any one of claims 1-9, wherein the pressing device and the bending test support device are both mounted on the body, the bending test support device is used to support the specimen, and the pressing device is used to press down on the specimen.

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