Anti-torsion device for dynamic fatigue testing machine
By using an upper and lower connecting plate design in the dynamic fatigue testing machine, combined with a guide rod and guide sleeve structure, the problem of upper and lower clamp torsion was solved, thus achieving the accuracy and stability of the test and reducing equipment wear and safety risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING GLASS STEEL INST TESTING CENT CO LTD
- Filing Date
- 2025-08-16
- Publication Date
- 2026-06-09
AI Technical Summary
The upper and lower hydraulic chucks of the dynamic fatigue testing machine are prone to relative rotation during the testing process, which can lead to inaccurate test data, accelerated equipment wear, and even endanger safety.
The design employs an upper and lower connecting plate, and through the guide rod and guide sleeve structure, ensures that the guide rod is perpendicular to the connecting plate, restricts the torsional freedom of the chuck, and achieves synchronous operation of the upper and lower chucks.
It effectively prevents the clamp from twisting, ensuring the accuracy and stability of the test, reducing equipment wear, and improving safety.
Smart Images
Figure CN224341328U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dynamic fatigue testing technology, and in particular to an anti-torsion device for a dynamic fatigue testing machine. Background Technology
[0002] A dynamic fatigue testing machine is a device used to test the fatigue performance of materials or structures under dynamic loads. It is of great significance in material performance evaluation, component life prediction, product quality control, and material fatigue mechanism research. However, during the fatigue testing process, relative rotation can easily occur between the upper and lower hydraulic clamps of the testing machine, causing the specimen to twist, which affects the accuracy of the test data, accelerates equipment wear and damage, and may endanger the safety of operators in severe cases.
[0003] To avoid relative torsion of the upper and lower hydraulic chucks during fatigue testing, commonly used anti-torsion devices include ball screw anti-torsion devices and hydraulic clamping anti-torsion devices. The ball screw anti-torsion device works by using a ball screw mechanism in the transmission parts of the upper and lower chucks to convert the linear motion of the hydraulic chucks into rotational motion. The high precision and self-locking properties of the ball screw prevent chuck torsion. However, ball screws are complex to manufacture, costly, and require specific installation and operating environments, including cleanliness and good lubrication; otherwise, their performance and lifespan may be affected. The hydraulic clamping anti-torsion device achieves its anti-torsion function by setting multiple hydraulic clamping units around the chucks. By rationally designing the shape and distribution of the clamping blocks, sufficient friction can be generated to prevent chuck torsion while clamping the sample. However, the hydraulic system is relatively complex, requiring a dedicated hydraulic pump station and control system, increasing equipment cost and maintenance difficulty. Furthermore, leaks or malfunctions in the hydraulic system may affect the normal operation of the anti-torsion device.
[0004] Therefore, in order to address the above problems, this utility model urgently needs to provide an anti-torsion device for a dynamic fatigue testing machine. Utility Model Content
[0005] The purpose of this utility model is to provide an anti-torsion device for a dynamic fatigue testing machine. This utility model fixes the upper connecting plate to the upper clamp of the testing machine and the lower connecting plate to the lower clamp of the testing machine. Through the structural design of the guide rail, it solves the problems of torsion of the upper and lower clamps in the dynamic fatigue test in the prior art.
[0006] An anti-torsion device for a dynamic fatigue testing machine includes an upper connecting plate for connecting to the upper chuck of the testing machine and a lower connecting plate for connecting to the lower chuck of the testing machine. The upper connecting plate is provided with a plurality of through holes at intervals.
[0007] The lower connecting plate is provided with multiple lower through holes that correspond one-to-one with each of the upper through holes; it also includes multiple vertically arranged guide rods, each of which is inserted into each of the upper and lower through holes and fixed to the lower connecting plate.
[0008] Furthermore, each guide rod has a connecting thread at the bottom of its side surface, and a first connecting nut and a second connecting nut are screwed onto the guide rod at intervals. The first connecting nut and the second connecting nut are respectively located on the upper and lower surfaces of the lower connecting plate.
[0009] Furthermore, a first guide sleeve and a second guide sleeve, which coincide with the axis of the upper through hole, are respectively fixed to the upper and lower surfaces of the upper connecting plate. The first guide sleeve and the second guide sleeve are tightly fitted and inserted into each guide rod.
[0010] Furthermore, the first guide sleeve includes a hollow cylindrical first cylinder and a first flange, the first flange being screwed to the upper surface of the upper connecting plate.
[0011] Furthermore, the second guide sleeve includes a hollow cylindrical second cylinder and a second flange, the second flange being screwed to the lower surface of the upper connecting plate.
[0012] Furthermore, an upper connecting hole is provided at the center of the upper surface of the upper connecting plate, and a corresponding lower connecting hole is provided at the center of the upper surface of the lower connecting plate.
[0013] Furthermore, an upper clamp, coaxially formed with the upper connecting hole, is screwed onto the lower surface of the upper connecting plate. One end of the upper clamp is open and can be adjusted and fixed by an upper adjusting bolt. A lower clamp, coaxially formed with the lower connecting hole, is screwed onto the lower surface of the lower connecting plate. One end of the lower clamp is open and can be adjusted and fixed by a lower adjusting bolt.
[0014] Furthermore, the diameter of both the upper and lower connecting holes is 200mm.
[0015] Furthermore, the guide rod is made of high-strength alloy steel, and its outer surface is smooth.
[0016] Furthermore, both the upper and lower connecting plates are made of alloy steel.
[0017] The anti-torsion device for a dynamic fatigue testing machine provided by this utility model has the following advantages compared with the prior art:
[0018] The anti-torsion device for the dynamic fatigue testing machine provided by this utility model involves passing the upper clamp of the testing machine through the upper connecting plate and clamping it with an upper clamp, and passing the lower clamp of the testing machine through the lower connecting plate and clamping it with a lower clamp. The specimen is then held by the upper and lower clamps, and the guide rod is fixed in the lower through hole with its upper end passing through the upper connecting plate. Since the guide rod is fixed to the lower connecting plate and always remains perpendicular, the guide rod is always perpendicular to the upper connecting plate. This ensures that the upper and lower clamps operate synchronously during the dynamic fatigue test, limiting the torsional freedom of the clamps during the test. When the torsional angles of the upper and lower clamps are different, torsion cannot occur due to the restriction of the guide rod, thus ensuring the accuracy and stability of the test. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram (three-dimensional view) of the anti-torsion device of the dynamic fatigue testing machine described in this utility model;
[0021] Figure 2 This is a schematic diagram (bottom view) of the upper connecting plate described in this utility model;
[0022] Figure 3 This is a schematic diagram (bottom view) of the lower connecting plate described in this utility model.
[0023] Explanation of reference numerals in the attached figures:
[0024] 1. Guide rod; 2. Upper connecting plate; 3. Lower connecting plate; 5. Lower through hole; 6. First connecting nut; 7. Second connecting nut; 8. First guide sleeve; 801. First cylinder; 802. First flange; 9. Second guide sleeve; 901. Second cylinder; 902. Second flange; 10. Upper connecting hole; 11. Lower connecting hole; 12. Upper clamp; 13. Upper adjusting bolt; 14. Lower clamp; 15. Lower adjusting bolt. Detailed Implementation
[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] like Figure 1 As shown, the present invention provides an anti-torsion device for a dynamic fatigue testing machine, including an upper connecting plate 2 for connecting to the upper clamp of the testing machine and a lower connecting plate 3 for connecting to the lower clamp of the testing machine. The upper connecting plate 2 is provided with a plurality of through holes at intervals.
[0029] The lower connecting plate 3 is provided with a plurality of lower through holes 5 that correspond one-to-one with each of the upper through holes; it also includes a plurality of vertically arranged guide rods 1, each guide rod 1 being respectively inserted into each of the upper through holes and the lower through holes 5, and being fixedly connected to the lower connecting plate 3.
[0030] The anti-torsion device for the dynamic fatigue testing machine provided by this utility model involves passing the upper clamp of the testing machine through the upper connecting plate 2 and clamping it with the upper clamp 12, and passing the lower clamp of the testing machine through the lower connecting plate 3 and clamping it with the lower clamp 14. The specimen is then held by the upper and lower clamps, and the guide rod 1 is fixed in the lower through hole 5 with its upper end passing through the upper through hole. Since the guide rod 1 is fixed to the lower connecting plate 3 and always remains perpendicular, the guide rod 1 and the upper connecting plate 2 are always perpendicular. This ensures that the upper and lower clamps operate synchronously during the dynamic fatigue test, restricting the torsional freedom of the clamps during the test. When the torsional angles of the upper and lower clamps are different, torsion cannot occur due to the restriction of the guide rod 1, thus ensuring the accuracy and stability of the test.
[0031] like Figure 1 As shown, each guide rod 1 has a connecting thread at the bottom of its side surface. A first connecting nut 6 and a second connecting nut 7 are screwed onto the guide rod 1 at intervals. The first connecting nut 6 and the second connecting nut 7 are respectively located on the upper and lower surfaces of the lower connecting plate 3.
[0032] In this utility model, the first connecting nut 6 is installed upright above the lower connecting plate 3 and screwed onto the guide rod 1, and the second connecting nut 7 is installed upside down below the lower connecting plate 3 and screwed onto the file 1. At this time, by tightening the first connecting nut 6 downward and tightening the second connecting nut 7 upward, the guide rod 1 can be fixed on the lower connecting plate 3, and the lower connecting plate 3 and the guide rod 1 can always be kept perpendicular.
[0033] like Figure 1 , Figure 3 As shown, the upper and lower surfaces of the upper connecting plate 2 are respectively fixed with a first guide sleeve 8 and a second guide sleeve 9 that coincide with the axis of the upper through hole. The first guide sleeve 8 and the second guide sleeve 9 are tightly fitted and inserted into each guide rod 1.
[0034] In this invention, the contact area between the guide rod 1 and the upper connecting plate 2 is extended by the first guide sleeve 8 and the second guide sleeve 9, thereby further maintaining the perpendicular relationship between the guide rod 1 and the upper connecting plate 2.
[0035] like Figure 1 As shown, the first guide sleeve 8 includes a hollow cylindrical first cylinder 801 and a first flange 802, which is screwed to the upper surface of the upper connecting plate 2.
[0036] like Figure 1 , Figure 3 As shown, the second guide sleeve 9 includes a hollow cylindrical second cylinder 901 and a second flange 902, with the second flange 902 screwed to the lower surface of the upper connecting plate 2.
[0037] like Figure 1 , Figure 2 , Figure 3 As shown, an upper connecting hole 10 is provided at the center of the upper surface of the upper connecting plate 2, and a corresponding lower connecting hole 11 is provided at the center of the upper surface of the lower connecting plate 3.
[0038] like Figure 1 , Figure 2 , Figure 3 As shown, the lower surface of the upper connecting plate 2 is screwed with an upper clamp 12 that is coaxial with the upper connecting hole 10. One end of the upper clamp 12 is open and can be adjusted and fixed by the upper adjusting bolt 13. The lower surface of the lower connecting plate 3 is screwed with a lower clamp 14 that is coaxial with the lower connecting hole 11. One end of the lower clamp 14 is open and can be adjusted and fixed by the lower adjusting bolt 15.
[0039] In this embodiment, the diameter of both the upper connecting hole 10 and the lower connecting hole 11 is 200mm.
[0040] In this embodiment, the guide rod 1 is made of high-strength alloy steel, and the outer surface of the guide rod 1 is smooth.
[0041] In this embodiment, both the upper connecting plate 2 and the lower connecting plate 3 are made of alloy steel.
[0042] The embodiments of this utility model include the following steps:
[0043] 1) Each guide rod 1 is fixed to the lower connecting plate 3 by the first connecting nut 6 and the second connecting nut 7;
[0044] 2) Fit the upper connecting plate 2 onto the upper chuck of the testing machine and use the upper adjusting bolt 13 to adjust the openings of the upper clamp 12 so that the upper clamp 12 clamps the upper chuck;
[0045] 3) Fit the lower connecting plate 3 onto the lower chuck of the testing machine, pass each guide rod 1 through the upper through hole, and use the lower adjusting bolt 15 to adjust the openings of the lower clamp 14 so that the lower clamp 14 clamps the lower chuck.
[0046] 4) Clamp the specimen with the upper and lower chucks of the testing machine and perform dynamic fatigue testing.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A torsion prevention device for a dynamic fatigue testing machine, characterized in that: It includes an upper connecting plate (2) for connecting to the upper chuck of the testing machine and a lower connecting plate (3) for connecting to the lower chuck of the testing machine. The upper connecting plate (2) is provided with a plurality of through holes at intervals. The lower connecting plate (3) is provided with multiple lower through holes (5) that correspond one-to-one with each upper through hole; it also includes multiple vertically arranged guide rods (1), each guide rod (1) is respectively inserted into each upper through hole and lower through hole (5) and fixedly connected to the lower connecting plate (3).
2. The dynamic fatigue testing machine anti-torsion device of claim 1, wherein: Each guide rod (1) has a connecting thread at the bottom of its side surface. A first connecting nut (6) and a second connecting nut (7) are screwed onto the guide rod (1) at intervals. The first connecting nut (6) and the second connecting nut (7) are respectively located on the upper and lower surfaces of the lower connecting plate (3).
3. The dynamic fatigue testing machine anti-torsion device of claim 2, wherein: The upper and lower surfaces of the upper connecting plate (2) are respectively fixed with a first guide sleeve (8) and a second guide sleeve (9) that coincide with the axis of the upper through hole. The first guide sleeve (8) and the second guide sleeve (9) are tightly fitted to each guide rod (1).
4. The dynamic fatigue testing machine anti-torsion device of claim 3, wherein: The first guide sleeve (8) includes a hollow cylindrical first cylinder (801) and a first flange (802), which is screwed to the upper surface of the upper connecting plate (2).
5. The dynamic fatigue testing machine anti-torsion device of claim 4, wherein: The second guide sleeve (9) includes a hollow cylindrical second cylinder (901) and a second flange (902), which is screwed to the lower surface of the upper connecting plate (2).
6. The dynamic fatigue testing machine anti-torsion device of claim 5, wherein: The upper connecting plate (2) has an upper connecting hole (10) at the center of its upper surface, and the lower connecting plate (3) has a corresponding lower connecting hole (11) at the center of its upper surface.
7. The dynamic fatigue testing machine anti-torsion device of claim 6, wherein: The lower surface of the upper connecting plate (2) is screwed with an upper clamp (12) that is coaxial with the upper connecting hole (10). One end of the upper clamp (12) is open and can be adjusted and fixed by an upper adjusting bolt (13). The lower surface of the lower connecting plate (3) is screwed with a lower clamp (14) that is coaxial with the lower connecting hole (11). One end of the lower clamp (14) is open and can be adjusted and fixed by a lower adjusting bolt (15).
8. The dynamic fatigue testing machine anti-torsion device of claim 7, wherein: The diameter of both the upper connecting hole (10) and the lower connecting hole (11) is 200 mm.
9. The dynamic fatigue testing machine anti-torsion device of claim 8, wherein: The guide rod (1) is made of high-strength alloy steel and has a smooth outer surface.
10. The dynamic fatigue testing machine anti-torsion device of claim 9, wherein: The upper connecting plate (2) and the lower connecting plate (3) are both made of alloy steel.