Nickel-titanium spring fatigue test equipment

Abstract

The utility model relates to nickel-titanium spring fatigue testing equipment which comprises an electronic digital display tension testing machine, a glass testing tool is arranged on the front side of the top of a workbench, the glass testing tool is located under a pressing rod, a piece of square glass is arranged at the bottom of the glass testing tool, a piece of vertical cylindrical glass is arranged at the top of the square glass, and the top of the vertical cylindrical glass is connected with the electronic digital display tension testing machine. A programmable direct-current power supply is arranged beside the electronic digital display tension tester, and the positive electrode and the negative electrode of the programmable direct-current power supply are connected with two electric wires and are respectively fixed at the upper end and the lower end of the nickel-titanium spring. According to the nickel-titanium spring fatigue test equipment, the fatigue test of the nickel-titanium spring can be realized through the electronic digital display tension tester, the programmable direct current power supply and a simple mechanical structure, the test process is automatic, the test stability is improved, the labor cost is reduced, the fatigue parameters of the nickel-titanium spring can be accurately obtained, and the working efficiency is improved. The equipment can greatly optimize the existing test mode and greatly improve the test efficiency.

Description

Technical Field

[0001] The utility model relates to a fatigue test device for a nickel-titanium spring. Background Art

[0002] The nickel-titanium spring has a function that ordinary springs do not have - the shape memory function. The nickel-titanium alloy is a kind of shape memory alloy. The spring made of it can present different states at different temperatures through the shape memory effect, and the force value of the spring is also different. Utilizing this special property of the nickel-titanium spring, it has been widely used in various fields, such as: automobiles, household appliances, fire protection systems, etc. However, in some fields, it is not sufficient to be used only once. It requires the nickel-titanium spring to work tens of thousands or millions of times to ensure the unchanged use performance of the equipment. Therefore, after processing the nickel-titanium spring, we need to conduct a fatigue test on the nickel-titanium spring. Since manual testing cannot meet our testing needs, we need a new type of testing device. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a fatigue test device for a nickel-titanium spring according to the above situation, and to conduct a simple and fast fatigue test on the nickel-titanium spring through the combination of an electronic digital display tensile testing machine, a programmable DC power supply and a simple mechanical structure.

[0004] The technical solution adopted by the utility model to solve the above problems is as follows:

[0005] A fatigue test device for a nickel-titanium spring, the test device includes an electronic digital display tensile testing machine. The electronic digital display tensile testing machine has a workbench. The rear side of the top of the workbench is the testing machine body. A vertically downward pressing rod is fixed at the bottom of the testing machine body. A test glass tooling is arranged on the front side of the top of the workbench. The test glass tooling is located directly below the pressing rod. The bottom of the test glass tooling is a square glass, and the top of the square glass is a vertical cylindrical glass. The top and bottom of the cylindrical glass are open, and a notch is provided on one side of the cylindrical glass. A programmable DC power supply is arranged beside the electronic digital display tensile testing machine. The programmable DC power supply is located on one side of the notch of the cylindrical glass. The programmable DC power supply is placed on a DC power support platform. The positive and negative poles of the programmable DC power supply are connected to two wires. The ends of the two wires both pass through the notch of the cylindrical glass. The nickel-titanium spring to be tested is placed in the cylindrical glass. After the ends of the two wires pass through the notch, they are respectively fixed to the upper and lower ends of the nickel-titanium spring.

[0006] A computer is also arranged beside the electronic digital display tensile testing machine, and the computer is connected to the electronic digital display tensile testing machine.

[0007] The caliber of the notch is smaller than the diameter of the nickel-titanium spring.

[0008] The beneficial effects of the present utility model are as follows:

[0009] The nickel-titanium spring fatigue testing equipment of the present utility model can achieve the fatigue testing of nickel-titanium springs through an electronic digital display tensile testing machine, a programmable DC power supply and a simple mechanical structure. The testing process is automated, which increases the stability of the testing, reduces the labor cost, and can accurately obtain the fatigue parameter of the nickel-titanium spring. This equipment can greatly optimize the existing testing method and greatly improve the testing efficiency. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the nickel-titanium spring fatigue testing equipment of the present utility model.

[0011] Figure 2 is Figure 1 an enlarged view of the installation position of the nickel-titanium spring in

[0012] In the figure: electronic digital display tensile testing machine 1, workbench 1.1, testing machine body 1.2, pressure bar 1.3, testing glass tooling 2, square glass 2.1, cylindrical glass 2.2, notch 2.3, programmable DC power supply 3, DC power supply support platform 4, electric wire 5, nickel-titanium spring 6, computer 7. Detailed Embodiment

[0013] Refer to Figure 1 and Figure 2 The present utility model relates to a nickel-titanium spring fatigue testing equipment. The testing equipment includes an electronic digital display tensile testing machine 1. The electronic digital display tensile testing machine 1 has a workbench 1.1. The rear side of the top of the workbench 1.1 is the testing machine body 1.2. A vertically downward pressure bar 1.3 is fixed to the bottom of the testing machine body 1.2.

[0014] A testing glass tooling 2 is arranged on the front side of the top of the workbench 1.1. The testing glass tooling 2 is located directly below the pressure bar 1.3. The bottom of the testing glass tooling 2 is a square glass 2.1. The top of the square glass 2.1 is a vertical cylindrical glass 2.2. The bottom of the cylindrical glass 2.2 is fixed to the square glass 2.1. The top and bottom of the cylindrical glass 2.2 are open, and a notch 2.3 is provided on one side of the cylindrical glass 2.2.

[0015] A programmable DC power supply 3 is arranged beside the electronic digital display tensile testing machine 1. The programmable DC power supply 3 is located on one side of the notch of the cylindrical glass 2.2. The programmable DC power supply is placed on the DC power supply support platform 4. The positive and negative poles of the programmable DC power supply 3 are connected to two electric wires 5. The ends of the two electric wires 5 both pass through the notch 2.3 of the cylindrical glass 2.2.

[0016] A nickel-titanium spring 6 to be tested is placed in the cylindrical glass 2.2. The diameter of the notch 2.3 is smaller than that of the nickel-titanium spring 6. The nickel-titanium spring 6 is limited by the cylindrical glass 2.2 to prevent it from falling out. After the ends of the two wires 5 pass through the notch 2.3, they are respectively fixed to the upper and lower ends of the nickel-titanium spring 6 for power supply.

[0017] A computer 7 is also provided beside the electronic digital display tensile testing machine 1. The computer 7 is connected to the electronic digital display tensile testing machine 1 and is used to display the force received by the nickel-titanium spring 6, and a force value curve graph is formed through multiple tests.

[0018] The working process of this nickel-titanium spring fatigue testing equipment is as follows:

[0019] First, place the nickel-titanium spring in the cylindrical glass of the test glass tooling, fix the wires to the upper and lower ends of the nickel-titanium spring, connect the other ends of the wires to the programmable DC power supply, place the test glass tooling on the workbench of the electronic digital display tensile testing machine, install the pressure bar on the electronic digital display tensile testing machine, adjust the pressure bar and the test glass tooling to be concentric and in contact with the nickel-titanium spring, connect the computer to the electronic digital display tensile testing machine, and set the parameters in the electronic digital display tensile testing machine and the programmable DC power supply;

[0020] After the preliminary preparations are completed, start the programmable DC power supply to energize the nickel-titanium spring. After the nickel-titanium spring is heated, it returns to its memory shape and fully rebounds. The programmable DC power supply cuts off the power according to the program-set time. Then start the electronic digital display tensile testing machine. The pressure bar on the electronic digital display tensile testing machine descends to compress the nickel-titanium spring to a specified height. The force value displayed on the electronic digital display is transmitted to the computer to form a force value curve graph, and the pressure bar rises to return to the initial height. Repeat this process. After the number of times is reached, analyze each curve graph to determine whether the fatigue performance of the nickel-titanium spring meets the requirements.

Claims

1. A nickel-titanium spring fatigue testing device, characterized by: The testing equipment includes an electronic digital display tensile testing machine, which has a workbench, the rear side of the top of the workbench is the testing machine body, the bottom of the testing machine body is fixed by a vertical downward pressure rod, the front side of the top of the workbench is provided with a test glass tooling, the test glass tooling is located directly below the pressure rod, the bottom of the test glass tooling is a square glass, the top of the square glass is a vertical cylindrical glass, the top and bottom of the cylindrical glass are open, and a notch is opened on one side of the cylindrical glass, a programmable DC power supply is arranged next to the electronic digital display tensile testing machine, the programmable DC power supply is located on one side of the notch of the cylindrical glass, the programmable DC power supply is placed on a DC power supply support platform, the positive and negative poles of the programmable DC power supply are connected to two wires, the ends of the two wires pass through the notch of the cylindrical glass, a nickel-titanium spring to be tested is placed in the cylindrical glass, and the ends of the two wires are respectively fixed to the upper and lower ends of the nickel-titanium spring after passing through the notch.

2. A nickel-titanium spring fatigue testing device according to claim 1, characterized in that: A computer is also arranged beside the electronic digital display tensile testing machine, and the computer is connected to the electronic digital display tensile testing machine.

3. A nickel-titanium spring fatigue testing device according to claim 1, characterized in that: The diameter of the notch is smaller than the diameter of the nickel-titanium spring.

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