Shaft test piece shear test fixture based on hydraulic universal testing machine

Abstract

The utility model relates to the technical field of shaft test piece shear test, in particular to a shaft test piece shear test clamp based on a hydraulic universal testing machine, which comprises a base, two adjusting mechanisms, a positioning mechanism, a pressing plate and a shaft support, the shaft support is fixedly mounted on the base, and the pressing plate is slidably mounted on the shaft support. The pressing plate is used for applying shearing force to the shaft sample, through holes are formed in the pressing plate and the shaft support, the two adjusting mechanisms can be mounted and dismounted on the shaft support and the pressing plate respectively, the adjusting mechanisms are used for adjusting the effective sizes of the through holes, and the positioning mechanism is fixedly mounted on the shaft support. According to the shaft test piece shear test fixture based on the hydraulic universal testing machine, through the arrangement of the shaft bracket, the pressing plate and the adjusting mechanism, the adjusting mechanism can adjust the size of the through hole, and then the pressing plate and the shaft bracket can clamp and fix shaft test pieces with different sizes, so that the universality and the convenience of the test fixture are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shaft specimen shearing test, and particularly relates to a shaft specimen shearing test clamp based on a hydraulic universal testing machine. BACKGROUND

[0002] The shaft is one of the important parts in mechanical transmission, which is generally supported by sliding bearing or rolling bearing, so that the parts on the shaft have a determined working position and transmit motion and power. In actual tooling, the shaft and the support will move, forming a shear plane and a tangential stress, i.e. shear force.

[0003] The principle of the shearing test is to measure the shear strength of the sample after it is subjected to shear force to fracture. The shear force is applied in the vertical direction to make the sample subjected to shear force in the direction parallel to the shear plane. The maximum value of the shear force is measured, which can reflect the ability of the material to resist shear sliding and is equal to the tangential stress value on the shear plane, i.e. the ratio of the shear force to the failure area. By measuring the shear force of the shaft, the shear performance of the shaft can be understood, so as to ensure the selection of appropriate materials in the design and manufacturing process and evaluate the strength and durability of the shaft.

[0004] However, the existing shaft specimen shearing test clamp is usually designed for a specific size range of specimen. When the size of the specimen exceeds this range, the clamp is difficult to use normally. For example, the clamping part of the clamp has a fixed size, which is easy to fail to clamp the shaft specimen with large diameter. For the specimen with small diameter, the specimen is easy to be damaged due to excessive clamping force, thereby reducing the universality of the test clamp and further reducing the use effect of the test clamp. SUMMARY

[0005] The utility model discloses a shaft specimen shearing test clamp based on a hydraulic universal testing machine.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a shaft specimen shearing test clamp based on a hydraulic universal testing machine, which comprises a base, two adjusting mechanisms, a positioning mechanism, a pressing plate and a shaft support. The shaft support is fixedly installed on the base. The pressing plate is slidably installed on the shaft support. The pressing plate is used to apply shear force to the shaft specimen. Through holes are formed in the pressing plate and the shaft support. The two adjusting mechanisms can be installed and detached on the shaft support and the pressing plate respectively. The adjusting mechanisms are used to adjust the effective size of the through holes. The positioning mechanism is fixedly installed on the shaft support. The positioning mechanism is used to position the pressing plate. A groove is formed in the base for the movement of the pressing plate.

[0008] Further, each adjusting mechanism comprises a hollow pipe, a mounting block and a sleeve ring, the hollow pipe is inserted with the through hole, the mounting block is fixedly installed on one side of the hollow pipe, and the sleeve ring is fixedly installed on one side of the shaft support.

[0009] Further, each adjusting mechanism further comprises a clamping block and a spring, one end of the spring is fixedly installed on the inner side of the mounting block, the other end of the spring is fixedly connected with the clamping block, the clamping block is slidingly connected with the inner side of the mounting block, and a clamping groove is formed in the sleeve ring and the clamping block is clamped in the clamping groove.

[0010] Further, a guide groove is formed in the mounting block, and a guide block is fixedly installed on the sleeve ring and inserted with the inner side of the guide groove.

[0011] Further, the positioning mechanism comprises a fixed plate, a supporting plate, a moving plate, a threaded rod and an inserting column, the fixed plate is fixedly installed on the shaft support, the supporting plate is fixedly installed on the shaft support, the inserting column is fixedly installed on the moving plate, the threaded rod is rotatably installed on the fixed plate and the supporting plate and is in threaded connection with the moving plate, one side of the pressing plate is provided with a circular hole, and the inserting column penetrates through the supporting plate and is clamped in the circular hole.

[0012] Further, the positioning mechanism further comprises a guide column, the guide column is fixedly installed on the fixed plate and the supporting plate and is in sliding connection with the moving plate.

[0013] The hydraulic universal testing machine shaft specimen shearing test clamp has the advantages that: the adjusting mechanism can adjust the size of the through hole according to the size of the shaft specimen to be tested, so that the pressing plate and the shaft support can clamp and fix shaft specimens of different sizes, the universality and convenience of the test clamp are improved, the positioning mechanism can position the pressing plate, the concentricity of the through hole formed in the pressing plate and the shaft support is improved, the centering accuracy during installation of the shaft specimen is improved, and the use effect of the test clamp is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments of the present application will be briefly introduced.

[0015] Figure 1 It is a three-dimensional structure schematic view of the present application;

[0016] Figure 2 It is an overall rear view structure schematic view of the present application;

[0017] Figure 3 It is an adjusting mechanism and shaft support split structure schematic view of the present application;

[0018] Figure 4 It is the adjusting mechanism and the split structure schematic view of the pressing plate of the utility model;

[0019] Figure 5 It is the main structure schematic view of the pressing plate of the utility model;

[0020] Figure 6 It is the main structure schematic view of the positioning mechanism of the utility model.

[0021] In the drawing: 1, base; 2, adjusting mechanism; 21, hollow circular tube; 22, mounting block; 23, clamping block; 24, spring; 25, collar; 26, clamping groove; 27, guide groove; 28, guide block; 3, positioning mechanism; 31, fixed plate; 32, support plate; 33, moving plate; 34, threaded rod; 35, guide column; 36, round hole; 37, insertion column; 4, pressing plate; 5, shaft support; 6, through hole; 7, recess. DETAILED DESCRIPTION

[0022] The technical scheme of the utility model will be further illustrated below in combination with the drawings and specific embodiments.

[0023] Among them, the drawing is only used for example explanation, and the representation is only schematic view, not physical drawing, and can not be understood as the limitation of the patent; in order to better illustrate the embodiment of the utility model, some components of the drawing will be omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, some known structures and their description in the drawing can be omitted, which is understandable.

[0024] Referring to Figures 1 to 4 , the based on hydraulic universal testing machine shaft specimen shear test fixture shown in the figure, including base 1, two adjusting mechanisms 2, positioning mechanism 3, pressing plate 4 and shaft support 5, the shaft support 5 is fixedly installed on the base 1, and the base 1 supports and fixes the shaft support 5, and the shaft support 5 clamps and fixes the shaft specimen, the pressing plate 4 is slidably installed on the shaft support 5, the pressing plate 4 is used for applying shear force to the shaft specimen, the pressing plate 4 is pressed by the hydraulic universal testing machine, so that the pressing plate 4 can apply shear force to the shaft specimen, and then the shear strength test of the shaft specimen can be carried out, the through hole 6 is formed in the pressing plate 4 and the shaft support 5, the shaft specimen is inserted into the through hole 6, so that the shaft specimen can be clamped and fixed, the two adjusting mechanisms 2 can be installed and detached on the shaft support 5 and the pressing plate 4 respectively, the adjusting mechanism 2 is used for adjusting the size of the through hole 6, the adjusting mechanism 2 is used for adjusting the size of the through hole 6, so that the through hole 6 can adapt to different sizes of shaft specimen, and then the test fixture is convenient for shear force test of different sizes of shaft specimen.

[0025] Referring to Figures 1 to 4The positioning mechanism 3 is fixedly installed on the shaft support 5, and is used for positioning the pressing plate 4. Through the positioning mechanism 3, the positioning effect can be achieved on the pressing plate 4, and the through hole 6 on the pressing plate 4 and the shaft support 5 can keep the same center, thereby further improving the centering accuracy of the shaft test piece during installation. The recess 7 for the movement of the pressing plate 4 is formed on the base 1. By installing the base 1 on the hydraulic universal testing machine and inserting the shaft test piece into the through hole 6 formed on the pressing plate 4 and the shaft support 5, then the pressing plate 4 is pressed by the hydraulic universal testing machine, so that the shaft test piece can be subjected to the vertical shear force, and the shear test of the shaft test piece can be realized.

[0026] With reference to Figure 3 and Figure 4 Each adjusting mechanism 2 comprises a hollow pipe 21, a mounting block 22 and a sleeve ring 25. The hollow pipe 21 is inserted into the through hole 6. By inserting the hollow pipe 21 into the through hole 6, the effective size of the through hole 6 becomes the inner diameter of the hollow pipe 21, so that the shaft test piece can be inserted into the hollow pipe 21 for fixation, and by replacing the hollow pipe 21 with different inner diameters, different sizes of shaft test pieces can be adapted. The mounting block 22 is fixedly installed on one side of the hollow pipe 21. By limiting the mounting block 22, the hollow pipe 21 is fixedly installed in the through hole 6. The sleeve ring 25 is fixedly installed on one side of the shaft support 5. The mounting block 22 is inserted into the inside of the sleeve ring 25.

[0027] With reference to Figure 3 and Figure 4 Each adjusting mechanism 2 further comprises a clamping block 23 and a spring 24. One end of the spring 24 is fixedly installed on the inside of the mounting block 22, and the other end of the spring 24 is fixedly connected with the clamping block 23. By the elastic force of the spring 24, the clamping block 23 always keeps clamped with the clamping groove 26 without external force, thereby limiting the mounting block 22 and keeping the hollow pipe 21 fixed. The clamping block 23 is slidingly connected with the inside of the mounting block 22. The sleeve ring 25 is provided with the clamping groove 26. The clamping block 23 is clamped with the clamping groove 26. By the clamping effect of the clamping block 23 and the clamping groove 26, the mounting block 22 can be limited. The mounting block 22 is provided with a guide groove 27. The sleeve ring 25 is fixedly installed with a guide block 28. The guide block 28 is inserted into the inside of the guide groove 27. By the insertion effect of the guide groove 27 and the guide block 28, the mounting block 22 and the hollow pipe 21 can be guided during installation, so that the position of the clamping block 23 and the clamping groove 26 always keeps corresponding installation.

[0028] With reference to Figure 5 and Figure 6The positioning mechanism 3 comprises a fixed plate 31, a supporting plate 32, a moving plate 33, a threaded rod 34 and a plug-in column 37, the fixed plate 31 is fixedly installed on the shaft support 5, the supporting plate 32 is fixedly installed on the shaft support 5, the threaded rod 34 is supported by the fixed plate 31 and the supporting plate 32, the plug-in column 37 is fixedly installed on the moving plate 33, the plug-in column 37 can be moved by the moving effect of the moving plate 33, thereby enabling the plug-in column 37 to be clamped or unclamped with the round hole 36, the threaded rod 34 is rotatably installed on the fixed plate 31 and the supporting plate 32, and the threaded rod 34 is threadedly connected with the moving plate 33, the moving plate 33 can be moved by the rotating effect of the threaded rod 34, one side of the pressing plate 4 is provided with the round hole 36, the plug-in column 37 penetrates through the supporting plate 32 and is clamped with the round hole 36, the pressing plate 4 can be limited by the clamping effect of the plug-in column 37 and the round hole 36, so that the pressing plate 4 always remains in a fixed position, facilitating the assembly and disassembly of the shaft specimen, the positioning mechanism 3 further comprises a guide column 35, the guide column 35 is fixedly installed on the fixed plate 31 and the supporting plate 32, and the guide column 35 is slidingly connected with the moving plate 33, the moving plate 33 can be guided by the guide column 35, avoiding the deviation of the moving plate 33 during movement.

[0029] The shaft specimen shearing test clamp based on the hydraulic universal testing machine can adjust the size of the through hole according to the size of the shaft specimen to be tested through the shaft support, the pressing plate and the adjusting mechanism, so that the pressing plate and the shaft support can clamp and fix shaft specimens of different sizes, thereby improving the universality and convenience of the test clamp. In addition, the positioning mechanism can position the pressing plate, thereby improving the concentricity of the through hole formed in the pressing plate and the shaft support, thereby improving the centering accuracy when the shaft specimen is installed, and further improving the use effect of the test clamp.

[0030] It should be noted that the above specific embodiments are only preferred embodiments of the present application and the technical principles applied. Those skilled in the art should understand that various modifications, equivalent replacements, changes, etc. can be made to the present application. However, as long as these changes do not deviate from the spirit of the present application, they should be within the protection scope of the present application. In addition, some terms used in the specification and claims of the present application are not limited, but only for convenience of description.

Claims

1. A shear test fixture for shaft specimens based on a hydraulic universal testing machine, characterized in that, The device includes a base (1), two adjustment mechanisms (2), a positioning mechanism (3), a pressure plate (4), and a shaft support (5). The shaft support (5) is fixedly installed on the base (1), and the pressure plate (4) is slidably installed on the shaft support (5). The pressure plate (4) is used to apply shear force to the shaft sample. Both the pressure plate (4) and the shaft support (5) have through holes (6). The two adjustment mechanisms (2) can be installed and removed from the shaft support (5) and the pressure plate (4), respectively. The adjustment mechanism (2) is used to adjust the effective size of the through hole (6). The positioning mechanism (3) is fixedly installed on the shaft support (5) and is used to position the pressure plate (4). The base (1) has a groove (7) for the pressure plate (4) to move.

2. The shear test fixture for shaft specimens based on a hydraulic universal testing machine according to claim 1, characterized in that, Each of the adjustment mechanisms (2) includes a hollow tube (21), a mounting block (22), and a collar (25). The hollow tube (21) is inserted into the through hole (6). The mounting block (22) is fixedly installed on one side of the hollow tube (21). The collar (25) is fixedly installed on one side of the shaft support (5). The mounting block (22) is inserted into the inner side of the collar (25).

3. The shear test fixture for shaft specimens based on a hydraulic universal testing machine according to claim 2, characterized in that, Each of the adjustment mechanisms (2) further includes a locking block (23) and a spring (24). One end of the spring (24) is fixedly installed on the inner side of the mounting block (22), and the other end of the spring (24) is fixedly connected to the locking block (23). The locking block (23) is slidably connected to the inner side of the mounting block (22). A locking groove (26) is provided on the collar (25), and the locking block (23) engages with the locking groove (26).

4. The shear test fixture for shaft specimens based on a hydraulic universal testing machine according to claim 3, characterized in that, The mounting block (22) has a guide groove (27), and the collar (25) has a guide block (28) fixedly installed on it. The guide block (28) is inserted into the inner side of the guide groove (27).

5. The shear test fixture for shaft specimens based on a hydraulic universal testing machine according to claim 1, characterized in that, The positioning mechanism (3) includes a fixed plate (31), a support plate (32), a movable plate (33), a threaded rod (34), and a plug-in post (37). The fixed plate (31) is fixedly installed on the shaft bracket (5), the support plate (32) is fixedly installed on the shaft bracket (5), the plug-in post (37) is fixedly installed on the movable plate (33), the threaded rod (34) is rotatably installed on the fixed plate (31) and the support plate (32), and the threaded rod (34) is threadedly connected to the movable plate (33). A round hole (36) is provided on one side of the pressure plate (4), the plug-in post (37) penetrates the support plate (32), and the plug-in post (37) is engaged with the round hole (36).

6. The shear test fixture for shaft specimens based on a hydraulic universal testing machine according to claim 5, characterized in that, The positioning mechanism (3) further includes a guide post (35), which is fixedly installed on the fixed plate (31) and the support plate (32), and the guide post (35) is slidably connected to the moving plate (33).

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