A fixture with stable clamping for mixed loading

Abstract

The present invention relates to a hybrid loading fixture with stable clamping, comprising a fixture body and an auxiliary clamping assembly. The auxiliary clamping assembly is installed in the middle of the fixture body. The fixture body includes an upper fixture and a lower fixture which are symmetrically arranged. The upper fixture and the lower fixture have the same structure. An auxiliary clamping assembly is symmetrically arranged between the upper fixture and the lower fixture. The auxiliary clamping assembly includes a driving part and a clamping part. The output end of the driving part is connected to the clamping part, and the clamping part abuts against the fixture body. On the one hand, the present invention improves the accuracy of the installation position of the spline, keeps the central axis of the spline overlapping with the central axis of the device, effectively overcomes the stress of the spline in the horizontal direction during the test, and improves the detection accuracy. On the other hand, it can provide a larger range of clamping force, can meet the tensile or compression test of a maximum test load of 3000 kN, and can perform tensile and compression tests on materials with different thicknesses and higher performance.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping devices, and in particular to a hybrid loading fixture with stable clamping. Background Art

[0002] Composite materials refer to materials composed of two or more different substances combined in different ways. They can bring out the advantages of various materials, overcome the defects of single materials, and expand the application scope of materials. Before use, they will be made into splines and the properties of the composite materials will be detected through tensile tests. Tensile test refers to a test method for determining the material properties under axial tensile load. In the tensile test, the test piece is fixed in the chuck of the testing machine, and then stretched until the test piece is broken. During the test process, the load-deformation curve is plotted or printed, and the yield load and ultimate load are read or printed from the curve and the pointer.

[0003] Due to the different materials of the splines during tensile testing, materials with higher tensile strength require greater test loads, and the clamping force of the fixture on the splines also needs to be increased accordingly. On the other hand, during the experiment, when the central axis of the spline deviates from the central axis of the fixture, horizontal stress is likely to be generated, resulting in a decrease in the accuracy of the detection results in the vertical direction of the spline, and it will also affect the stability of the spline during testing, and easily lead to abnormal failure of the spline. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a hybrid loading fixture with higher detection accuracy.

[0005] The above invention purpose of the present invention is achieved through the following technical solutions:

[0006] A hybrid loading fixture with stable clamping, including a fixture body and an auxiliary clamping assembly. The auxiliary clamping assembly is installed in the middle of the fixture body. The fixture body includes a symmetrically arranged upper fixture and a lower fixture. The upper fixture and the lower fixture have the same structure. An auxiliary clamping assembly is symmetrically arranged between the upper fixture and the lower fixture. The auxiliary clamping assembly includes a driving part and a clamping part. The output end of the driving part is connected to the clamping part, and the clamping part abuts against the fixture body.

[0007] By adopting the above technical solutions, the symmetrically arranged auxiliary clamping assembly can, on the one hand, improve the accuracy of the spline installation position, keep the central axis of the spline overlapping with the central axis of the device, and effectively overcome the horizontal stress generated by the spline during the test, thereby improving the detection accuracy of the spline; on the other hand, the auxiliary clamping assembly can also provide the clamping force required for a test load of up to 3000 kN. In order to adapt to the testing of splines of different sizes, the fixture body can provide clamping areas of different sizes.

[0008] In a preferred example, the present invention can be further configured as follows: the upper fixture includes a connecting seat, a driving member, and a clamping member. The driving member is installed in the middle of the connecting seat. An installation groove is formed on one side of the connecting seat. A part of the clamping member is located inside the installation groove, and the other part is located outside the installation groove and abuts against the clamping portion.

[0009] By adopting the above technical solution, driven by the driving member, the clamping member can drive the spline for tensile testing, which is convenient to use and has high working efficiency.

[0010] In a preferred example, the present invention can be further configured as follows: the inner wall of the installation groove is inclined, and its side facing the clamping portion gradually narrows. A part of the clamping member located in the installation groove is wedge-shaped.

[0011] By adopting the above technical solution, the cooperation between the inclined installation groove and the wedge-shaped clamping member can improve the stability of the clamping of the spline by the teaching aid body, facilitating the test.

[0012] In a preferred example, the present invention can be further configured as follows: the clamping portion is U-shaped, and its end is connected to the fixture body through a through-connected connecting shaft. The side surface of the clamping portion is connected to the driving portion.

[0013] By adopting the above technical solution, the U-shaped clamping portion can uniformly clamp the clamping member, making the forces on both sides of the clamping member more uniform and having high connection stability.

[0014] In a preferred example, the present invention can be further configured as follows: the driving portion includes a hydraulic cylinder, a fixing plate, and a guide rod. The fixing plates are arranged on both sides of the hydraulic cylinder. The fixing plate is fixedly connected to the outer wall of the clamping portion. The fixing plates located at both ends of the hydraulic cylinder are connected by the guide rod. The clamping portion is provided with a through hole for the hydraulic cylinder to pass through.

[0015] By adopting the above technical solution, driven by the hydraulic cylinder, the output end of the hydraulic cylinder moves along the length direction of the guide rod, thereby adjusting the position of the clamping member through the through hole to achieve position adjustment.

[0016] In a preferred example, the present invention can be further configured as follows: a fine-tuning handle is arranged on the side of the clamping portion away from the driving portion. The fine-tuning handle passes through the clamping portion and is connected to the fixture body.

[0017] By adopting the above technical solution, the fine-tuning handle can perform fine-tuning correction after the driving portion adjusts the position of the clamping member, ensuring that the central axis of the spline coincides with the central axis of the device.

[0018] In a preferred example, the present invention can be further configured such that the driving portions are provided on both sides of the clamping portion.

[0019] By adopting the above technical solution, the symmetrically arranged driving portions have the characteristics of good synchronism and high adjustment stability, and are convenient to use.

[0020] In summary, the present invention includes at least one of the following beneficial technical effects:

[0021] 1. By adopting the technical solution of providing symmetrically arranged auxiliary clamping components between the upper clamp and the lower clamp, on the one hand, the accuracy of the installation position of the spline can be improved, and the central axis of the spline can be kept overlapping with the central axis of the device. On the other hand, the stress in the horizontal direction generated by the spline during the test can be effectively overcome, thereby improving the detection accuracy of the spline;

[0022] 2. By adopting the technical solution of the upper clamp composed of the connecting seat, the driving member and the clamping member, the power of a relatively large load can be improved, the splines of different sizes can be detected, it is convenient to use, and the working efficiency is relatively high;

[0023] 3. By adopting the technical solution of the driving portion composed of the hydraulic cylinder, the fixing plate and the guide rod, the position of the clamping member clamping the spline inside can be adjusted through the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments in combination with the drawings, where

[0025] Figure 1 is the overall structural schematic diagram of Embodiment 1.

[0026] Figure 2 is Figure 1 the sectional structural schematic diagram of

[0027] Figure 3 is the overall structural schematic diagram of Embodiment 2.

[0028] The reference numerals in the drawings are:

[0029] 1. Fixture body; 11. Upper clamp; 111. Connecting seat; 1111. Installation groove; 112. Driving member; 113. Clamping member; 12. Lower clamp; 2. Auxiliary clamping component; 21. Driving portion; 211. Hydraulic cylinder; 212. Fixing plate; 213. Guide rod; 22. Clamping portion; 221. Through hole; 3. Connecting shaft; 4. Fine adjustment handle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following further details the present invention in combination with the drawings.

[0031] Embodiment 1:

[0032] Referring to Figure 1 , a hybrid loading fixture with stable clamping disclosed by the present invention includes a fixture body 1 and an auxiliary clamping assembly 2. The fixture body 1 includes an upper fixture 11 and a lower fixture 12 which are symmetrically arranged and have the same structure. A number of groups of auxiliary clamping assemblies 2 are symmetrically arranged between the upper fixture 11 and the lower fixture 12. Through the auxiliary clamping assembly 2, not only can the stability of the connection between the spline and the fixture body 1 be improved, but also the central axis of the spline can be kept overlapping with the central axis of the fixture body 1 during the detection process, improving the stability of the spline under force, and effectively relieving the stress in the horizontal direction generated by the spline, improving the accuracy of the detection result. In this embodiment, the clamping surfaces of the upper fixture 11 and the lower fixture 12 can adjust the clamping area according to the size of the specific detected spline, thereby improving the versatility of the device and facilitating the detection of splines of different sizes.

[0033] Referring to Figure 2 , the upper fixture 11 includes a connection seat 111, a driving member 112 and a clamping member 113. An installation hole is opened at the bottom of the connection seat 111, which facilitates the installation of the upper fixture 11 with an external testing device through the installation hole. An installation groove 1111 is opened on one side of the connection seat 111 away from the installation hole. The driving member 112 is installed in the middle of the installation groove 1111. In this embodiment, the driving member 112 uses a hydraulic jack as the driving member 112, which has the characteristics of high load, easy control and convenient use. In order to further improve the installation between the driving member 112 and the connection seat 111, the inner wall of the installation groove 1111 on the side facing the auxiliary clamping assembly 2 is inclined, and the included angle becomes smaller as it gets closer to the auxiliary clamping assembly 2. The clamping member 113 uses symmetrically arranged clamping pieces. One part of the clamping piece is located inside the installation groove 1111, and the other part is located outside the installation groove 1111. The end of the clamping piece located inside the installation groove 1111 is wedge-shaped. Through the wedge-shaped clamping piece, the friction between the clamping member 113 and the connection seat 111 can be increased, improving the stability of the connection between the two and preventing the two from moving relative to each other during the test.

[0034] In order to improve the stability of the connection between the clamping part 22 and the clamping member 113, the clamping part 22 is arranged in a U shape, and its inner wall abuts against the outer wall of the clamping member 113. Both are arranged vertically. The clamping part 22 is connected to the upper clamp 11 and the lower clamp 12 through a vertically arranged connecting shaft 3. On one side of the outer wall of the clamping part 22, a number of driving parts 21 are evenly arranged along its length direction, so that a part of the clamping member 113 outside the installation groove 1111 is more evenly stressed. Each driving part 21 includes a hydraulic cylinder 211, a fixing plate 212 and a guide rod 213. Fixing plates 212 are arranged on both sides of the hydraulic cylinder 211. One of the fixing plates 212 is fixedly connected to the outside of the clamping part 22. A number of guide rods 213 are arranged along the circumferential direction of the two fixing plates 212. Through the guide rods 213, the hydraulic cylinder 211 is always in a horizontal state during the displacement process. A through hole 221 for the output end of the hydraulic cylinder 211 to pass through is also provided in the middle of the clamping part 22, which is convenient for clamping and fixing the clamping member 113.

[0035] In order to further improve the stability of the connection between the spline and the device, a fine-tuning handle 4 is also arranged on the side of the clamping part 22 away from the driving part 21. The output end of the fine-tuning handle 4 passes through the outer wall of the clamping part 22 and is connected to the clamping member 113. Through the fine-tuning handle 4, the position of the clamping member 113 is finely adjusted, so as to ensure that the central axis of the spline always coincides with the central axis of the device, and improve the accuracy of the detection result.

[0036] The specific implementation process of this embodiment is as follows:

[0037] When detecting the spline, first adjust the distance inside the clamping member 113 by adjusting the driving member 112, then vertically place the spline into the inside of the clamping member 113, and drive the clamping member 113 to initially fix the spline through the driving member 112. After the initial fixation is completed, start the hydraulic cylinder 211. Driven by the hydraulic cylinder 211, the clamping part 22 clamps the clamping member 113 and performs secondary fixation on the spline. After the fixation is completed, finely adjust the position of the spline through the fine-tuning handle 4 to ensure that its central axis coincides with the central axis of the device, and offset the horizontal stress generated by the spline during the test process, so as to improve the stability of the connection between the spline and the device and the accuracy of the detection result.

[0038] Embodiment Two

[0039] Refer to Figure 3, the difference technical feature between this embodiment and the first embodiment is that: this embodiment does not install the fine-tuning handle 4, and driving parts 21 are symmetrically installed on both sides of the clamping part 22. The two driving parts 21 located on the same horizontal line function through the same hydraulic pump, and the synchronism between them is higher, so as to ensure that during the adjustment process, the spline coincides with the central axis of the device, thus eliminating the need for manual fine-tuning and improving work efficiency.

[0040] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hybrid loading fixture with stable clamping, comprising a fixture body (1) and an auxiliary clamping assembly (2). The auxiliary clamping assembly (2) is installed in the middle of the fixture body (1), and is characterized in that: The fixture body (1) includes an upper fixture (11) and a lower fixture (12) which are symmetrically arranged. The upper fixture (11) and the lower fixture (12) have the same structure. An auxiliary clamping assembly (2) is symmetrically arranged between the upper fixture (11) and the lower fixture (12). The auxiliary clamping assembly (2) includes a driving part (21) and a clamping part (22). The output end of the driving part (21) is connected to the clamping part (22), and the clamping part (22) abuts against the fixture body (1). The clamping part (22) is arranged in a U shape, and its end is connected to the fixture body (1) through a connecting shaft (3) arranged therethrough. The side surface of the clamping part (22) is connected to the driving part (21). A fine-tuning handle (4) is arranged on one side of the clamping part (22) away from the driving part (21). The fine-tuning handle (4) passes through the clamping part (22) and is connected to the fixture body (1).

2. The clamping-stable hybrid loading fixture according to claim 1, wherein: The upper fixture (11) includes a connecting seat (111), a driving member (112) and a clamping member (113). The driving member (112) is installed in the middle of the connecting seat (111). An installation groove (1111) is formed on one side of the connecting seat (111). A part of the clamping member (113) is located inside the installation groove (1111), and the other part is located outside the installation groove (1111) and abuts against the clamping part (22).

3. The clamping-stable hybrid loading fixture according to claim 2, characterized in that: The inner wall of the installation groove (1111) is inclined, and its side facing the clamping part (22) gradually narrows. A part of the clamping member (113) located in the installation groove (1111) is arranged in a wedge shape.

4. A clamping-stable hybrid loading fixture according to claim 1, characterized in that: The driving part (21) includes a hydraulic cylinder (211), a fixing plate (212) and a guide rod (213). The fixing plates (212) are arranged on both sides of the hydraulic cylinder (211). The fixing plate (212) is fixedly connected to the outer wall of the clamping part (22). The fixing plates (212) located at both ends of the hydraulic cylinder (211) are connected through the guide rod (213). The clamping part (22) is provided with a through hole (221) for the hydraulic cylinder (211) to pass through.

5. A clamping-stable hybrid loading fixture according to claim 4, characterized in that: The driving parts (21) are arranged on both sides of the clamping part (22).

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