Bending strength testing clamp for hydraulic servo fatigue testing machine

Abstract

The utility model discloses a bending strength testing clamp for a hydraulic servo fatigue testing machine in the field of material testing equipment, which is characterized by comprising a base, an inverted T-shaped guide groove extending along the length direction of the base is arranged at the upper end of the base, two opposite supports are arranged in the guide groove in a sliding manner, and the two supports are arranged on the base. One end, far away from the guide groove, of the support is used for supporting the bottom of a test sample; the support is provided with a locking piece, and the locking piece is used for fixing the support and the guide groove; a jacking mechanism is arranged above the gap between the two supports; the positions of the two supports can be effectively adjusted in a centering mode according to test samples of different lengths and specifications, the test efficiency and the applicability of the samples are improved, the manufacturing cost is low, and follow-up component maintenance is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of material testing equipment, in particular to a bending strength testing fixture for a hydraulic servo fatigue testing machine. Background Art

[0002] A hydraulic servo fatigue testing machine is a device used to simulate the complex load conditions that materials and structures will encounter in actual use, and conduct long-term fatigue, fracture, and life tests. With their ability to precisely control the load magnitude and frequency, these testing machines play a crucial role in material research and quality control in fields such as aviation, automotive, bridge construction, and biomedicine.

[0003] The fixtures used in traditional hydraulic servo fatigue testing machines often only focus on standard tensile and fatigue tests, and the fixtures for bending strength tests are often not optimally designed, having the following problems: (1) Difficult centering: When conducting a bending test, ensuring the correct centering of the test sample is crucial for the accuracy of the test results. Traditional fixtures often require manual adjustment, which is cumbersome and prone to introducing human errors. (2) Poor adaptability: For test samples of different sizes and shapes, it may be very difficult to adjust the position and fulcrum of the fixture, reducing the test efficiency and versatility. (3) Complicated maintenance: The complicated mechanical structure is prone to failure, increasing the maintenance cost and the downtime of the equipment. Summary of the Utility Model

[0004] To overcome the deficiencies of the prior art, the technical problem to be solved by the utility model is: how to improve the problem that the existing bending strength testing fixture is inconvenient to operate and has a complicated structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A bending strength testing fixture for a hydraulic servo fatigue testing machine, characterized by comprising a base. A reverse T-shaped guiding groove extending along the length direction of the base is opened at the upper end of the base. Two opposite supports are slidably arranged in the guiding groove, and one end of the support away from the guiding groove is used to support the bottom of the test sample; A locking member is arranged on the support, and the locking member is used to fix the support and the guiding groove; A pressing mechanism is arranged above the gap between the two supports;

[0007] A through hole is opened in the support. The locking member comprises a fixing screw rod. Fixing nuts are arranged at either end of the fixing screw rod, and a movable nut is threadedly sleeved on the fixing screw rod. The fixing nut is slidably arranged in the guiding groove, and one side of the fixing screw rod away from the fixing nut penetrates upward through the guiding groove. The screw rod penetrates through the through hole. When the movable nut is tightened, the movable nut abuts against the outer wall of the support, and the fixing nut abuts against the inner wall of the guiding groove.

[0008] Further, the diameter of the above-mentioned fixed nut is the same as the width dimension of the above-mentioned guide groove, and the thickness of the above-mentioned fixed nut is less than the height dimension of the above-mentioned guide groove.

[0009] Further, a scale parallel to the above-mentioned guide groove is provided on the side wall or the top wall of the above-mentioned base in the length direction.

[0010] Further, the above-mentioned pressing mechanism includes an upper pressing head, the above-mentioned upper pressing head includes a pressing head end and a driving end, and the above-mentioned driving end is connected to the hydraulic driving system of the testing machine.

[0011] Further, the pressing head end of the above-mentioned upper pressing head is angular.

[0012] Further, the above-mentioned support is arranged in an L shape, and the above-mentioned support includes a horizontally mounted portion and a vertically supported portion connected to each other. The lower end of the above-mentioned horizontally mounted portion fits against the upper end of the above-mentioned base. The through hole is vertically opened in the above-mentioned horizontally mounted portion, and the movable nut abuts against the upper end of the above-mentioned horizontally mounted portion.

[0013] Further, a clamping groove for placing a test sample is provided at the upper end of the above-mentioned vertically supported portion.

[0014] The beneficial effects of the present utility model are:

[0015] (1) The sliding fit is realized through the inverted T-shaped guide groove and the fixed nut, which can ensure convenient adjustment of the position of the entire support in the length direction of the base, and further facilitate the adjustment of the distance between the two supports. At the same time, by tightening the movable nut, the movable nut and the fixed nut form a stable clamping and fixing structure between the base and the support, and the threaded connection structure can ensure stability. The entire adjustment and fixing process is relatively convenient, and it can effectively adjust the positions of the two supports for centering according to test samples of different lengths and specifications, improving the test efficiency and the applicability of the samples.

[0016] (2) The entire structure can realize the adjustment and fixing process only through a bolt structure, without the cooperation and assistance of other structural parts, with a low manufacturing cost and convenient subsequent component maintenance. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is an exploded schematic diagram of the connection relationship between the guide groove and the locking member of the present utility model;

[0019] Figure 3 is a top view schematic diagram of the base of the present utility model;

[0020] Figure 4 is a schematic diagram of the connection relationship between the support and the locking member of the present utility model;

[0021] In the figure, the markings are as follows: 1 - base, 2 - support, 3 - locking piece, 4 - upper pressing head, 5 - guiding groove, 6 - scale, 7 - clamping groove, 21 - horizontal mounting part, 22 - vertical support part, 31 - fixing screw, 32 - movable nut, 33 - fixing nut, 51 - sliding part, 52 - connecting part, 100 - test sample. Detailed implementation mode

[0022] The present utility model will be further described below with reference to the accompanying drawings.

[0023] As Figures 1-4 shown, an embodiment of the present application provides a bending strength test fixture for a hydraulic servo fatigue testing machine, including a base 1. A reverse T-shaped guiding groove 5 extending along the length direction of the base 1 is provided at the upper end of the base 1. Two opposite supports 2 are slidably arranged in the guiding groove 5. One end of the support 2 away from the guiding groove 5 is used to support the bottom of the test sample. A locking piece 3 is arranged on the support 2, and the locking piece 3 is used to fix the support 2 and the guiding groove 5. Above the gap between the two supports 2, a top pressing mechanism is provided. A through hole is provided in the support 2. The locking piece 3 includes a fixing screw 31. Fixing nuts 33 are arranged at either end of the fixing screw 31. The fixing screw 31 is threadedly sleeved with a movable nut 32. The fixing nut 33 is slidably arranged in the guiding groove 5. One side of the fixing screw 31 away from the fixing nut 33 penetrates upward through the guiding groove 5. The screw penetrates through the through hole. When the movable nut 32 is tightened, the movable nut 32 abuts against the outer wall of the support 2, and the fixing nut 33 abuts against the inner wall of the guiding groove 5.

[0024] It should be noted that in this embodiment, the reverse T-shaped guiding groove 5 and the fixing nut 33 are used to achieve sliding fit, which can ensure convenient adjustment of the position of the entire support 2 in the length direction of the base 1, and thus convenient adjustment of the distance between the two supports 2. At the same time, by tightening the movable nut 32, a stable clamping and fixing structure is formed between the base 1 and the support 2 by the movable nut 32 and the fixing nut 33. Moreover, the threaded connection structure can ensure stability. The entire adjustment and fixing process is relatively simple, and the distance between the two supports 2 can be effectively adjusted according to test samples of different lengths and specifications. The entire structure can achieve the adjustment and fixing process only through a bolt structure, without the cooperation and assistance of other structural parts, with a low manufacturing cost and convenient subsequent component maintenance.

[0025] Specifically, the above-mentioned base 1 is a horizontally installed long strip base, and the upper end surface of the base 1 is a horizontal plane. The guide groove 5 is parallel to the horizontal plane and parallel to the length extension direction of the base 1. The whole base 1 is installed on the base 1 of the testing machine to ensure good support performance. Moreover, the lower end of the production contact the upper end of the base 1 and has sufficient contact area to ensure sufficient support area. The inverted T-shaped guide groove 5 includes a sliding part 51 with a larger size at the lower part and a connecting part 52 connecting the sliding part 51 at the upper part. The size of the connecting part 52 is not less than the outer diameter size of the fixing screw 31, the size of the sliding part 51 is not less than the outer diameter size of the fixing nut 33, and the outer diameter of the fixing nut 33 is greater than the outer diameter of the fixing screw 31. Through the above size relationship, it is ensured that the fixing nut 33 slides relative to the inner wall of the sliding part 51 in the sliding part 51 and cannot penetrate out of the connecting part 52 in the vertical direction, ensuring the stability during the adjustment process and avoiding the phenomenon of tilting or offset of the production after adjustment.

[0026] Moreover, in order to ensure that the bottoms of the two supports 2 have sufficient support area and the two supports 2 can be moved to the minimum distance, the above-mentioned support 2 is arranged in an L shape, and the above-mentioned support 2 includes a horizontally installed part 21 and a vertically supporting part 22 connected to each other. The lower end of the above-mentioned horizontally installed part 21 fits the upper end of the above-mentioned base 1. The through hole is vertically opened in the above-mentioned horizontally installed part 21. The movable nut 32 abuts against the upper end of the above-mentioned horizontally installed part 21. The vertically supporting parts 22 of the two supports 2 are arranged oppositely, and a clamping groove 7 for placing test samples is arranged at the upper end of the vertically supporting part 22. The width of the clamping groove 7 is adapted to the width of the standard test sample.

[0027] When it is necessary to adjust the distance between the two supports 2, by loosening the movable nut 32, when the fixing nut 33 can slide relatively in the guide groove 5, the position of the whole fixing screw 31 together with the above-mentioned support 2 in the length direction of the base 1 can be adjusted; when it is necessary to fix the distance between the two supports 2, directly tighten the movable nut 32 so that the movable nut 32 and the fixing nut 33 clamp and fix the support 2 and the base 1.

[0028] In order to further ensure the stability when adjusting the position of the support 2, the diameter of the above-mentioned fixing nut 33 is the same as the width dimension of the above-mentioned guide groove 5, and the thickness of the above-mentioned fixing nut 33 is less than the height dimension of the above-mentioned guide groove 5, that is, the outer diameter of the above-mentioned fixing nut 33 is equal to the width dimension of the sliding part 51, and the outer wall of the fixing nut 33 and the inner wall of the sliding part 51 are both smooth. It is ensured that when the fixing nut 33 slides along the length direction of the sliding part 51, it will not shake randomly in the horizontal direction, and the thickness of the fixing nut 33 is less than the height of the sliding part 51. When the fixing nut is loosened, the lower end of the fixing nut 33 contacts the bottom wall of the sliding part 51 and the upper end does not contact the top wall of the sliding part 51, reducing the friction during the adjustment process.

[0029] Moreover, during the adjustment process, for the need of precise adjustment, a scale 6 parallel to the guiding groove 5 is provided on the side wall or the top wall of the base 1 in the length direction, avoiding the step of measuring with the scale 6 after the adjustment and improving the test efficiency.

[0030] For the above-mentioned top pressing mechanism, the top pressing mechanism includes an upper pressing head 4. The upper pressing head 4 includes a pressing head end and a driving end. The driving end is connected to the hydraulic driving system of the testing machine. That is to say, the testing machine drives the upper pressing head 4 to move downward by controlling the hydraulic system and can ensure that the upper pressing head 4 is stably pressed on the middle position of the experimental sample 100 to realize the pressing bending process. Moreover, the pressing head end of the upper pressing head 4 is angular, and the thickness of the pressing head is the same as the width of the standard sample. The top angle part of the angular upper pressing head 4 presses on the middle of the experimental sample 100, and under the supporting action of the two supports 2, the three-segment force application realizes the pressing bending operation, and then the bending strength data of the experimental sample 100 can be detected.

[0031] In summary, the embodiment of the present application proposes a bending strength test fixture for a hydraulic servo fatigue testing machine, including a base 1. A T-shaped inverted guiding groove 5 extending along the length direction of the base 1 is provided at the upper end of the base 1. Two opposite supports 2 are slidably arranged in the guiding groove 5. One end of the support 2 away from the guiding groove 5 is used to support the bottom of the test sample. A locking member 3 is arranged on the support 2, and the locking member 3 is used to fix the support 2 and the guiding groove 5. A pressing mechanism is arranged above the gap between the two supports 2. A through hole is provided in the support 2. The locking member 3 includes a fixing screw 31. Fixing nuts 33 are arranged at either end of the fixing screw 31. And a movable nut 32 is threadedly sleeved on the fixing screw 31. The fixing nut 33 is slidably arranged in the guiding groove 5. And one side of the fixing screw 31 away from the fixing nut 33 penetrates upward through the guiding groove 5. The screw penetrates through the through hole. When the movable nut 32 is tightened, the movable nut 32 abuts against the outer wall of the support 2, and the fixing nut 33 abuts against the inner wall of the guiding groove 5. This embodiment has the following advantages. Simple operation: Through the design of the wedge-shaped fixture and the base 1 with the scale 6 of the ruler, the installation and adjustment process of the specimen is simple and fast, reducing the operation complexity. The operator can operate the equipment proficiently without complicated training, significantly improving the working efficiency of the laboratory. Strong adaptability: The position of the bracket is adjustable to adapt to specimens of different sizes and shapes, increasing the applicable range and flexibility of the equipment. This design allows the laboratory to complete various types of bending tests on the same equipment, reducing the equipment purchase and maintenance costs. High-precision testing: The design of the lower support seat with a scale ensures the accurate centering of the specimen, improving the accuracy and repeatability of the test results. Precise force application and displacement control make the test data more reliable and repeatable. Simple maintenance: The structural design is simplified, durable materials are used, reducing the daily maintenance requirements, extending the service life of the equipment, and reducing the maintenance costs. The modular design makes the repair and replacement of parts of the equipment more simple and fast.

Claims

1. A bending strength test fixture for a hydraulic servo fatigue testing machine, characterized in that, It includes a base (1). A reverse T-shaped guide groove (5) extending along the length direction of the base (1) is formed at the upper end of the base (1). Two opposite supports (2) are slidably arranged in the guide groove (5). One end of the support (2) away from the guide groove (5) is used to support the bottom of the test sample. A locking member (3) is arranged on the support (2), and the locking member (3) is used to fix the support (2) and the guide groove (5). Above the gap between the two supports (2), a pressing mechanism is arranged. The support (2) is provided with a through hole. The locking member (3) includes a fixing screw (31). Fixing nuts (33) are arranged at either end of the fixing screw (31). And the fixing screw (31) is threadedly sleeved with a movable nut (32). The fixing nut (33) is slidably arranged in the guide groove (5). And one side of the fixing screw (31) away from the fixing nut (33) penetrates upward through the guide groove (5). The screw penetrates through the through hole. When the movable nut (32) is tightened, the movable nut (32) abuts against the outer wall of the support (2), and the fixing nut (33) abuts against the inner wall of the guide groove (5).

2. The bending strength test fixture for a hydraulic servo fatigue testing machine according to claim 1, wherein The diameter of the fixing nut (33) is the same as the width dimension of the guide groove (5), and the thickness of the fixing nut (33) is less than the height dimension of the guide groove (5).

3. The bending strength test fixture for a hydraulic servo fatigue testing machine according to claim 1, characterized in that, A scale (6) parallel to the guide groove (5) is arranged on the side wall or the top wall of the base (1) along the length direction.

4. A bending strength test fixture for a hydraulic servo fatigue testing machine according to claim 1, characterized in that, The pressing mechanism includes an upper pressing head (4). The upper pressing head (4) includes a pressing head end and a driving end. The driving end is connected to the hydraulic driving system of the testing machine.

5. The bending strength test fixture for a hydraulic servo fatigue testing machine according to claim 4, wherein The pressing head end of the upper pressing head (4) is angular.

6. A bending strength test fixture for a hydraulic servo fatigue testing machine according to claim 1, wherein The support (2) is arranged in an L shape, and the support (2) includes a horizontally installed portion (21) and a vertically supported portion (22) connected to each other. The lower end of the horizontally installed portion (21) fits against the upper end of the base (1). The through hole is vertically formed in the horizontally installed portion (21), and the movable nut (32) abuts against the upper end of the horizontally installed portion (21).

7. A bending strength test fixture for a hydraulic servo fatigue testing machine according to claim 6, characterized in that, A clamping groove (7) for placing the test sample is arranged at the upper end of the vertically supported portion (22).

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