Novel combined compression clamp

Abstract

The invention relates to a novel combined compression clamp which comprises a lower pressing plate, an upper pressing plate, an upper cross beam and a guide shaft, and mounting through holes are formed in the four corners of the lower pressing plate, the four corners of the upper pressing plate and the four corners of the upper cross beam; a sample is arranged between the lower pressing plate and the upper pressing plate; one end of the guide shaft is mounted at the mounting through hole of the lower pressing plate, and the other end of the guide shaft penetrates through the mounting through hole of the upper pressing plate and is mounted at the mounting through hole of the upper cross beam. The testing machine host can apply a load F on the surface of the upper pressing plate, the load F finally acts on the test sample, so that a compression test is carried out on the test sample, and in the compression test process, the guide shaft and the linear bearing can provide stability and accuracy for displacement of the lower pressing plate and the upper pressing plate; and the test working condition that the upper pressing plate and the lower pressing plate need higher parallelism can be met.

Description

Technical Field

[0001] The invention relates to the technical field of clamps, and mainly to a novel combined compression clamp. Background Art

[0002] Compression test is a test to determine the mechanical properties of materials under axial static pressure, and is one of the basic methods for testing the mechanical properties of materials. The compression fixture is a special test fixture for compression test, and its typical structure consists of an upper and lower pressure plate. The sample is placed between the upper and lower pressure plates, and is subjected to compressive load. The relationship between the pressure and deformation of the test sample can be used to obtain indicators such as compression strength and elastic modulus.

[0003] The current mainstream compression fixture structure is that the upper and lower pressure plates are installed on different components. Usually, the lower pressure plate is installed on the test bench assembly of the testing machine, and the upper pressure plate is installed on the lower crossbeam assembly of the testing machine. In this installation method and structure, there is no direct positioning and guiding relationship between the upper and lower pressure plates. The relative parallelism between the upper and lower pressure plates is only guaranteed by the assembly accuracy of the testing machine itself. If the testing machine itself has low accuracy or is improperly assembled, the relative parallelism error between the upper and lower pressure plates will be large. At the same time, the value of the relative parallelism between the surfaces of the upper and lower pressure plates of the compression fixture will directly affect the accuracy of the test data results and the compression curve, especially for some special working conditions such as compression testing of powder metallurgy materials, the parallelism requirements of the upper and lower pressure plates are extremely high. At present, conventional compression fixture structures are difficult to meet the corresponding parallelism requirements, and the test data and results are often not ideal. Summary of the invention

[0004] In view of the above problems, the present invention proposes a novel combined compression clamp.

[0005] The specific technical solutions are as follows:

[0006] A new type of combined compression fixture includes a lower pressing plate, an upper pressing plate, an upper crossbeam and a guide shaft. The four corners of the lower pressing plate, the upper pressing plate and the upper crossbeam are all provided with mounting holes; a sample is provided between the lower pressing plate and the upper pressing plate; the upper crossbeam is located above the upper pressing plate; one end of the guide shaft is installed at the mounting hole of the lower pressing plate, and the other end passes through the mounting hole of the upper pressing plate and is installed at the mounting hole of the upper crossbeam.

[0007] A lower cover plate is provided at the mounting through hole of the lower pressing plate, and the lower cover plate is fixed to the lower end of the guide shaft by hexagon socket screws;

[0008] An upper cover plate is provided at the installation through hole of the upper crossbeam, and the upper cover plate fixes the upper crossbeam and the upper end of the guide shaft by means of hexagon socket screws;

[0009] A linear bearing is arranged between the upper pressing plate and the guide shaft. The linear bearing is sleeved on the guide shaft and is fixed to the upper pressing plate by means of hexagon socket screws.

[0010] The upper pressing plate is used in conjunction with the guide shaft, and the upper pressing plate moves up and down along the direction of the guide shaft.

[0011] The beneficial effects of the present invention are:

[0012] During the compression test, the present invention first places the test sample between the lower pressing plate and the upper pressing plate. At this time, the lower pressing plate is fixed on the test bench assembly of the test machine host, and the test machine host will apply a load F on the upper pressing plate surface, and the load F will eventually act on the test sample, thereby performing a compression test on the test sample. During the compression test, the guide shaft and the linear bearing can provide stability and accuracy for the displacement of the lower pressing plate and the upper pressing plate. Therefore, the relative parallelism of the lower pressing plate and the upper pressing plate can be strictly controlled, which can meet the test conditions where the upper and lower pressing plates need to have higher parallelism requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 It is a cross-sectional view of the present invention.

[0015] In the figure: lower pressure plate 1, upper pressure plate 2, upper cross beam 3, guide shaft 4, sample 5, lower cover plate 6, upper cover plate 7, linear bearing 8. DETAILED DESCRIPTION

[0016] In order to make the technical solution of the present invention clearer and more explicit, the present invention is further described below in conjunction with the accompanying drawings. Any equivalent replacement of the technical features of the technical solution of the present invention and any solution derived by conventional reasoning shall fall within the protection scope of the present invention.

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A new type of combined compression clamp includes a lower pressing plate 1, an upper pressing plate 2, an upper crossbeam 3 and a guide shaft 4. The four corners of the lower pressing plate 1, the upper pressing plate 2 and the upper crossbeam 3 are all provided with mounting holes; the upper crossbeam 3 is located above the upper pressing plate 2; one end of the guide shaft 4 is installed at the mounting hole of the lower pressing plate 1, and the other end passes through the mounting hole of the upper pressing plate 2 and is installed at the mounting hole of the upper crossbeam 3.

[0019] A sample 5 is provided between the lower pressing plate 1 and the upper pressing plate 2;

[0020] A lower cover plate 6 is provided at the mounting through hole of the lower pressing plate 1, and the lower cover plate 6 fixes the lower pressing plate 1 and the lower end of the guide shaft 4 by means of hexagon socket screws;

[0021] An upper cover plate 7 is provided at the installation through hole of the upper cross beam 3, and the upper cover plate 7 fixes the upper cross beam 3 and the upper end of the guide shaft 4 by means of hexagon socket screws;

[0022] A linear bearing 8 is provided between the upper pressing plate 2 and the guide shaft 4. The linear bearing 8 is sleeved on the guide shaft 4 and is fixed to the upper pressing plate 2 by means of hexagon socket screws.

[0023] The upper pressing plate 2 is used in conjunction with the guide shaft 4 , and the upper pressing plate 2 moves up and down along the direction of the guide shaft 4 .

[0024] The present invention adds a guide shaft and a linear bearing between the upper and lower pressing plates of the compression fixture for positioning and guiding. The guide shaft and the linear bearing are components for precise linear motion, wherein the straightness of the guide shaft can reach 0.1mm / 1000mm. Through the high-precision positioning and guiding of the guide shaft and the linear bearing themselves, the upper and lower pressing plates can always maintain a high straightness during the displacement process, and the flatness of the pressing plate surfaces of the upper and lower pressing plates is relatively easy to achieve and guarantee, and the flatness after precision machining can usually reach 0.04mm. Combined with the high-precision pressing plate surface flatness and displacement straightness, the upper and lower pressing plates can meet the test conditions with high parallelism requirements.

[0025] During the compression test, the present invention first places the test sample between the lower pressing plate and the upper pressing plate. At this time, the lower pressing plate is fixed on the test bench assembly of the test machine host, and the test machine host will apply a load F on the upper pressing plate surface, and the load F will eventually act on the test sample, thereby performing a compression test on the test sample. During the compression test, the guide shaft and the linear bearing can provide stability and accuracy for the displacement of the lower pressing plate and the upper pressing plate. Therefore, the relative parallelism of the lower pressing plate and the upper pressing plate can be strictly controlled, which can meet the test conditions where the upper and lower pressing plates need to have higher parallelism requirements.

[0026] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", "all around" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A novel combined compression fixture, comprising a lower pressing plate (1), an upper pressing plate (2), an upper crossbeam (3) and a guide shaft (4), characterized in that: The four corners of the lower pressing plate (1), the upper pressing plate (2) and the upper cross beam (3) are all provided with mounting holes; the upper cross beam (3) is located above the upper pressing plate (2); one end of the guide shaft (4) is mounted on the mounting hole of the lower pressing plate (1), and the other end passes through the mounting hole of the upper pressing plate (2) and is mounted on the mounting hole of the upper cross beam (3).

2. A novel combined compression clamp as claimed in claim 1, characterized in that: A sample (5) is provided between the lower pressing plate (1) and the upper pressing plate (2).

3. A novel combined compression clamp as claimed in claim 1, characterized in that: A lower cover plate (6) is provided at the installation through hole of the lower pressing plate (1), and the lower cover plate (6) fixes the lower pressing plate (1) and the lower end of the guide shaft (4) by means of hexagon socket screws.

4. A novel combined compression clamp as claimed in claim 1, characterized in that: An upper cover plate (7) is provided at the installation through hole of the upper cross beam (3), and the upper cover plate (7) fixes the upper cross beam (3) and the upper end of the guide shaft (4) by means of hexagon socket screws.

5. A novel combined compression clamp as claimed in claim 1, characterized in that: A linear bearing (8) is provided between the upper pressing plate (2) and the guide shaft (4); the linear bearing (8) is sleeved on the guide shaft (4); and the linear bearing (8) is fixed to the upper pressing plate (2) by means of a hexagon socket screw.

6. A novel combined compression clamp as claimed in claim 1, characterized in that: The upper pressing plate (2) is used in conjunction with the guide shaft (4), and the upper pressing plate (2) moves up and down along the direction of the guide shaft (4).

Images