Shape memory alloy expansion sleeve and universal testing machine

Abstract

The utility model discloses a shape memory alloy expansion sleeve, and belongs to the technical field of expansion sleeves. Comprising an inner sleeve and an outer sleeve, a plurality of shape memory alloy plates are embedded in the outer surface of the outer sleeve, the shape memory alloy plates and the outer surface of the outer sleeve are located on the same circumference, and slow expansion grooves are formed between the side edges of the shape memory alloy plates and the outer sleeve. According to the expansion sleeve, the reliability of power transmission between the shaft and the outer wheel can be effectively improved, and the service life is prolonged. In addition, the utility model further discloses a universal testing machine using the shape memory alloy expansion sleeve, and the test result is more accurate on the basis of improving the reliability of power transmission.

Description

Technical Field

[0001] This utility model relates to the field of shrink sleeve technology, and in particular to a shape memory alloy shrink sleeve and a universal testing machine that transmits power from the shape memory alloy shrink sleeve. Background Technology

[0002] An expansion sleeve is a keyless connection device used in wheel and shaft connections. It transmits load by tightening high-strength bolts, which create pressure and friction between the mating surfaces. Expansion sleeves typically consist of an inner sleeve and an outer sleeve. The inner sleeve compresses the outer sleeve, creating pressure friction between the outer sleeve and the outer wheel. With increased usage time or load, wear between the outer sleeve and the outer wheel gradually increases, leading to decreased power transmission efficiency and a limited service life.

[0003] As an instrument for testing the mechanical properties of materials or components, the power transmission effect of a universal testing machine directly affects the accuracy of the test. Special materials require a lot of power when performing tensile and torsional tests, which places high demands on the power transmission of the universal testing machine. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention aims to provide a shrink sleeve with good power transmission effect and long service life, and a universal testing machine using the shrink sleeve in power transmission.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A shape memory alloy expansion sleeve includes an inner sleeve and an outer sleeve. Several shape memory alloy plates are embedded on the outer surface of the outer sleeve. The shape memory alloy plates are on the same circumference as the outer surface of the outer sleeve. The side of the shape memory alloy plate is provided with a slow expansion groove between it and the outer sleeve.

[0007] Preferably, the shape memory alloy plate consists of two pieces, symmetrically embedded on the outer periphery of the outer casing.

[0008] Preferably, the shape memory alloy plate and the outer jacket are integrally welded together by laser welding.

[0009] Preferably, the shape memory alloy plate and the outer casing are detachably connected as a single unit.

[0010] Preferably, the shape memory alloy plate is snapped together with the outer casing.

[0011] Preferably, the shape memory alloy plate is made of a two-way shape memory alloy.

[0012] Preferably, the shape memory alloy plate is made of CuZnAl shape memory alloy material, with a high-temperature phase transition point of 65℃~85℃, and the shape of the high-temperature phase expands outward; the low-temperature phase transition point is room temperature, and the shape of the low-temperature phase is on the same circumference as the outer surface of the jacket.

[0013] In addition, this utility model also provides a universal testing machine. The power system of the universal testing machine includes a servo motor and a reducer. The servo motor and the reducer are synchronously driven by a pulley. The output shaft of the servo motor is connected to the pulley by the aforementioned shape memory alloy expansion sleeve.

[0014] During use, as the motor rotates, the temperature at the expansion sleeve gradually rises. When the temperature reaches the high-temperature phase transition point, deformation begins, and the shape memory alloy plate expands outwards. At this point, the pressure exerted by the expansion sleeve on the outer wheel comes not only from the inner sleeve pressing in and the expansion force of the outer sleeve and the shape memory alloy plate, but also from the deformation force of the shape memory alloy plate itself. This significantly improves power transmission between the shaft and the outer wheel, reduces the pressure load on the outer periphery of the expansion sleeve, and extends its service life (it will not affect normal use until the shape memory alloy plate is completely worn away). After use, as the temperature decreases, the outward expansion force of the shape memory alloy plate gradually disappears, ensuring that the expansion sleeve can be easily removed when disassembly is required.

[0015] In addition, the shape memory alloy plate and the outer jacket can be detachably connected. On the one hand, there is no need to install the shape memory alloy plate under low load or low power transmission. On the other hand, it is convenient to replace the shape memory alloy plate when it is worn, saving materials and making it convenient and quick. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the expansion sleeve;

[0017] Figure 2 This is a schematic diagram of the power system structure of a universal testing machine.

[0018] In the diagram: 1. Inner sleeve; 2. Outer sleeve; 3. Shape memory alloy plate; 4. Expansion groove; 10. Servo motor; 20. Reducer; 30. Pulley. Detailed Implementation

[0019] The structure of this utility model will now be fully described in conjunction with specific embodiments so that those skilled in the art can fully understand and implement it.

[0020] like Figure 1 As shown: A shape memory alloy expansion sleeve includes an inner sleeve 1 and an outer sleeve 2. Two shape memory alloy plates 3 are embedded on the outer surface of the outer sleeve 2, and the two shape memory alloy plates 3 are symmetrically embedded. The shape memory alloy plates 3 and the outer surface of the outer sleeve 2 are on the same circumference, and a slow expansion groove 4 is provided between the side of the shape memory alloy plate 3 and the outer sleeve 2.

[0021] Further configuration: The shape memory alloy plate 3 and the outer jacket 2 are integrally welded together by laser welding.

[0022] Among them, shape memory alloy plate 3 is made of two-way shape memory alloy, as detailed below:

[0023] The shape memory alloy plate 3 is made of CuZnAl shape memory alloy material, with a high-temperature phase transition point of 65℃~85℃, and the shape of the high-temperature phase expands outward; the low-temperature phase transition point is room temperature, and the shape of the low-temperature phase is on the same circumference as the outer surface of the jacket 2.

[0024] During use, the temperature of the motor's output shaft and the expansion sleeve gradually increases. When it reaches the high-temperature phase transition point, the shape memory alloy plate 3 expands outward, increasing the pressure on the outer wheel (transmission wheel) through the expansion force of the deformation, thereby enhancing the power transmission effect. When not in use, the temperature drops back to room temperature, the expansion force of the shape memory alloy plate 3 disappears, and it returns to its initial shape. The design of the slow expansion groove 4 can reduce the impact of inconsistent thermal expansion and contraction of different metal edges.

[0025] In a preferred embodiment, the shape memory alloy plate 3 and the outer jacket 2 are detachably connected as one unit.

[0026] In a preferred embodiment, the shape memory alloy plate 3 is snapped together with the outer jacket 2.

[0027] In addition, this utility model also provides a universal testing machine, such as Figure 2 As shown, the power system of the universal testing machine includes a servo motor 10 and a reducer 20. The servo motor 10 and the reducer 20 are synchronously driven by a pulley 30. The output shaft of the servo motor 10 is connected to the pulley 30 via the aforementioned shape memory alloy expansion sleeve, as shown at point A in the figure. For a precision testing instrument like the universal testing machine, the reliability of power transmission is particularly important. Using the shape memory alloy expansion sleeve in this embodiment for the power transmission system greatly improves the reliability of power transmission, resulting in more accurate test results.

[0028] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the technical principles and scope of this utility model. Therefore, any combination, modification, or substitution made to the disclosed technical features of this utility model based on its technical essence, without departing from the principles or solution of this utility model, should fall within the protection scope of this utility model.

Claims

1. A shape memory alloy expansion sleeve, comprising an inner sleeve (1) and an outer sleeve (2), characterized in that, The outer surface of the outer jacket (2) is inlaid with several shape memory alloy plates (3), the shape memory alloy plates (3) and the outer surface of the outer jacket (2) are on the same circumference, and the side of the shape memory alloy plate (3) and the outer jacket (2) are provided with a slow expansion groove (4).

2. The shape memory alloy expansion sleeve as described in claim 1, characterized in that, The shape memory alloy plate (3) consists of two pieces, which are symmetrically embedded on the outer periphery of the outer jacket (2).

3. A shape memory alloy expansion sleeve as described in any one of claims 1 or 2, characterized in that, The shape memory alloy plate (3) is made of two-way memory alloy.

4. The shape memory alloy expansion sleeve as described in claim 3, characterized in that, The shape memory alloy plate (3) is made of CuZnAl shape memory alloy material, with a high temperature phase transition point of 65℃~85℃, and the shape of the high temperature phase expands outward; the low temperature phase transition point is room temperature, and the shape of the low temperature phase is on the same circumference as the outer surface of the outer jacket (2).

5. A universal testing machine, wherein the power system of the universal testing machine includes a servo motor (10) and a reducer (20), the servo motor (10) and the reducer (20) being synchronously driven by a pulley (30), characterized in that, The output shaft of the servo motor (10) is connected to the pulley (30) via the shape memory alloy expansion sleeve in claim 1.

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