A micro-stroke test fixture used in a steady strong magnetic field

Abstract

A micro-range test fixture used in a steady-state strong magnetic field comprises a guide rod, the left end of the guide rod is connected to a left piezoelectric ceramic motor through a left motor fixing plate, the right end of the guide rod is connected to a right piezoelectric ceramic motor through a right motor fixing plate, the left piezoelectric ceramic motor is connected to a left displacement amplifier, the right piezoelectric ceramic motor is connected to a right displacement amplifier, the left displacement amplifier is connected to a pressure sensor, the pressure sensor is connected to a left test fixture, the right displacement amplifier is connected to a right test fixture, the left test fixture and the right test fixture are arranged opposite to each other, and the left displacement amplifier and the right displacement amplifier are movably mounted on the guide rod. The invention is easy to use and has more accurate measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of fixture devices, in particular to a micro-stroke test fixture used in a steady-state strong magnetic field. Background Art

[0002] Strong magnetic fields, like extremely low temperatures and ultra-high pressures, are listed as one of the most important extreme conditions for modern scientific experiments. They provide new avenues for research in physics, chemistry, materials, biology, and other disciplines, and play an important role in discovering and understanding new phenomena and revealing new laws. Nuclear magnetic resonance under strong magnetic fields is also a necessary tool for research in life sciences, medicine, and brain sciences. For example, in the study of biological macromolecules that are closely related to agriculture and human health, a considerable number of samples can only be in liquid form and can only be studied under strong magnetic field conditions. Strong magnetic fields can be divided into two categories: steady-state strong magnetic fields and pulsed strong magnetic fields.

[0003] To test various samples in a strong magnetic field, a corresponding fixture is needed to clamp the samples. The current fixtures are either complex in structure and high in manufacturing cost, or easily affected by the strong magnetic field and cannot achieve the purpose of testing. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a micro-range test fixture used in a steady-state strong magnetic field, which is easy to use and has more accurate measurement.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A micro-range test fixture used in a steady-state strong magnetic field comprises a guide rod, the left end of the guide rod is connected to a left piezoelectric ceramic motor through a left motor fixing plate, the right end of the guide rod is connected to a right piezoelectric ceramic motor through a right motor fixing plate, the left piezoelectric ceramic motor is connected to a left displacement amplifier, the right piezoelectric ceramic motor is connected to a right displacement amplifier, the left displacement amplifier is connected to a pressure sensor, the pressure sensor is connected to a left test fixture, the right displacement amplifier is connected to a right test fixture, the left test fixture and the right test fixture are arranged opposite to each other, and the left displacement amplifier and the right displacement amplifier are movably mounted on the guide rod.

[0007] The left motor fixing plate and the right motor fixing plate are movably mounted on the guide rod, a left spring fixing plate is fixed to the left end of the guide rod, a left compression spring is installed in the left spring fixing plate, a gap is provided between the left spring fixing plate and the left motor fixing plate, the left compression spring is connected to the left motor fixing plate, a right spring fixing plate is fixed to the right end of the guide rod, a right compression spring is installed in the right spring fixing plate, a gap is provided between the right spring fixing plate and the right motor fixing plate, the right compression spring is connected to the right motor fixing plate.

[0008] The guide rod, the housings of the left and right piezoelectric ceramic motors, the housings of the left and right displacement amplifiers, the pressure sensor, the left test fixture and the right test fixture are respectively made of non-ferromagnetic materials.

[0009] The guide rod is made of copper alloy, the shells of the left piezoelectric ceramic motor and the right piezoelectric ceramic motor are made of stainless steel, the shells of the left displacement amplifier and the right displacement amplifier are made of aluminum alloy, the pressure sensor is made of copper alloy shell, and the test fixture is made of aluminum alloy.

[0010] The left displacement amplifier and the right displacement amplifier are both flexible hinge displacement amplifiers.

[0011] The left spring fixing plate is provided with a left blocking card plate, and the left blocking card plate blocks the left motor fixing plate; the right spring fixing plate is provided with a right blocking card plate, and the right blocking card plate blocks the right motor fixing plate.

[0012] The left blocking clamping plate and the left spring fixing plate are integrally formed, and the right blocking clamping plate and the right spring fixing plate are integrally formed.

[0013] The invention is easy to use and has more accurate measurement. By adopting a piezoelectric ceramic motor, the invention has lower noise, fast response speed and simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Attached Figure 2 It is a partial exploded schematic diagram of the present invention. DETAILED DESCRIPTION

[0016] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] As attached Figure 1 and 2As shown, the present invention discloses a micro-range test fixture used in a steady-state strong magnetic field, comprising a guide rod 1, the left end of the guide rod 1 is connected to a left piezoelectric ceramic motor 41 through a left motor fixing plate 31, the right end of the guide rod 1 is connected to a right piezoelectric ceramic motor 42 through a right motor fixing plate 32, the left piezoelectric ceramic motor 41 is connected to a left displacement amplifier 51, the right piezoelectric ceramic motor 42 is connected to a right displacement amplifier 52, the left displacement amplifier 51 is connected to a pressure sensor 6, the pressure sensor 6 is connected to a left test fixture 71, the right displacement amplifier 52 is connected to a right test fixture 72, the left test fixture 71 and the right test fixture 72 are arranged opposite to each other, and the left displacement amplifier 51 and the right displacement amplifier 52 are movably mounted on the guide rod 1. Preferably, four guide rods are arranged in parallel, and the four guide rods enclose a space similar to a rectangle.

[0018] The left motor fixing plate 31 and the right motor fixing plate 32 are movably mounted on the guide rod 1. The left end of the guide rod 1 is fixed with a left spring fixing plate 91, and a left compression spring is installed in the left spring fixing plate 91. There is a gap between the left spring fixing plate 91 and the left motor fixing plate 31, and the left compression spring is connected to the left motor fixing plate 91. The right end of the guide rod 1 is fixed with a right spring fixing plate 92, and a right compression spring 10 is installed in the right spring fixing plate 92. There is a gap between the right spring fixing plate 92 and the right motor fixing plate 32, and the right compression spring 10 is connected to the right motor fixing plate 32. The left spring fixing plate and the right spring fixing plate are respectively locked on the guide rod by nuts. The gaps between the left motor fixing plate and the left spring fixing plate, and between the right motor fixing plate and the right spring fixing plate are preferably set to 0.1-0.2mm, and the preferred gap value is 0.15mm. The left compression spring and the right compression spring provide a pre-tightening force for the test piece to be tested, so that the left piezoelectric ceramic motor and the right piezoelectric ceramic motor can clamp the test piece even when they are not working.

[0019] The guide rod, the housings of the left and right piezoelectric ceramic motors, the housings of the left and right displacement amplifiers, the pressure sensor, the left test fixture and the right test fixture are respectively made of non-ferromagnetic materials, such as copper, aluminum, insulating materials and wood, etc. The guide rod is made of copper alloy, the housings of the left and right piezoelectric ceramic motors are made of stainless steel, the housings of the left and right displacement amplifiers are made of high-strength aluminum alloy, the pressure sensor is made of copper alloy housing, and the test fixture is made of high-strength aluminum alloy.

[0020] The left displacement amplifier and the right displacement amplifier are both flexible hinge displacement amplifiers, which can achieve the purpose of amplifying the displacement several times or even dozens of times. The flexible hinge displacement amplifier is an existing well-known product, which can be purchased directly from the market and can meet the basic displacement amplification function corresponding to the displacement, and there is no limitation on the specific type and model.

[0021] The left spring fixing plate 91 is provided with a left blocking card plate 21, which blocks the left motor fixing plate 31; the right spring fixing plate 92 is provided with a right blocking card plate 22, which blocks the right motor fixing plate 32. The left blocking card plate and the right blocking card plate can limit the travel between the left motor fixing plate and the right motor fixing plate.

[0022] The left blocking clamping plate and the left spring fixing plate are integrally formed, and the right blocking clamping plate and the right spring fixing plate are integrally formed.

[0023] It should be noted that the above description of each component as left and right (such as left piezoelectric ceramic motor, right piezoelectric ceramic motor) is only for the convenience of describing the entire technical solution and is not a limitation. Components belonging to the same part have the same structure.

[0024] In the present invention, the extension and retraction actions can be performed by adjusting the positive and negative polarities of the input electricity of the left piezoelectric ceramic motor and the right piezoelectric ceramic motor. Since the piezoelectric ceramic motor has the advantages of low stroke and high-speed movement, the displacement amplifier 4 can move back and forth at high speed, thereby providing high-frequency pulse pressure for the specimen, preparing conditions for completing relevant tests.

[0025] At the beginning, the specimen is clamped between the left test fixture and the right test fixture. Initially, the left piezoelectric ceramic motor and the right piezoelectric ceramic motor are not working. At this time, the left test fixture and the right test fixture are respectively subjected to the elastic force of the left compression spring and the right compression spring to pre-clamp the specimen. By reserving the gap between the left spring fixing plate and the left motor fixing plate, and the right spring fixing plate and the right motor fixing plate, when the specimen is affected and elongated in a strong magnetic field, the elongation value is about 0.3mm. At this time, the gaps at the left and right ends are offset to ensure that the pressure of the specimen will not increase due to its own elongation. As the left and right piezoelectric ceramic motors move back and forth at high speed and with a small stroke, the left displacement amplifier and the right displacement amplifier also move together to achieve displacement amplification, and the pressure sensor detects the clamping force of the test piece in real time. Even when used in a strong magnetic field, it will not be affected by the magnetic field.

[0026] It should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-range test fixture used in a steady-state strong magnetic field, comprising a guide rod, characterized in that: The left end of the guide rod is connected to the left piezoelectric ceramic motor through the left motor fixing plate, and the right end of the guide rod is connected to the right piezoelectric ceramic motor through the right motor fixing plate. The left piezoelectric ceramic motor is connected to the left displacement amplifier, and the right piezoelectric ceramic motor is connected to the right displacement amplifier. The left displacement amplifier is connected to a pressure sensor, and the pressure sensor is connected to a left test fixture, and the right displacement amplifier is connected to a right test fixture. The left test fixture and the right test fixture are arranged opposite to each other, and the left displacement amplifier and the right displacement amplifier are movably mounted on the guide rod. The left motor fixing plate and the right motor fixing plate are movably mounted on the guide rod. The left end of the guide rod is fixed with a left spring fixing plate, and a left compression spring is mounted in the left spring fixing plate. There is a gap between the left spring fixing plate and the left motor fixing plate, and the left compression spring is connected to the left motor fixing plate. The right end of the guide rod is fixed with a right spring fixing plate. A right compression spring is installed in the spring fixing plate, and there is a gap between the right spring fixing plate and the right motor fixing plate. The right compression spring is connected to the right motor fixing plate. A left blocking card is provided on the left spring fixing plate, and the left blocking card blocks the left motor fixing plate; a right blocking card is provided on the right spring fixing plate, and the right blocking card blocks the right motor fixing plate; by reserving gaps between the left spring fixing plate and the left motor fixing plate, and between the right spring fixing plate and the right motor fixing plate, when the specimen is affected and elongated in a strong magnetic field, the elongation value is offset by the gaps at the left and right ends respectively, ensuring that the pressure of the specimen will not increase due to its own elongation; the guide rod, the housings of the left piezoelectric ceramic motor and the right piezoelectric ceramic motor, the housings of the left displacement amplifier and the right displacement amplifier, the pressure sensor, the left test fixture and the right test fixture are respectively made of non-ferromagnetic materials.

2. The micro-range test fixture used in a steady-state strong magnetic field according to claim 1, characterized in that: The guide rod is made of copper alloy, the shells of the left piezoelectric ceramic motor and the right piezoelectric ceramic motor are made of stainless steel, the shells of the left displacement amplifier and the right displacement amplifier are made of aluminum alloy, the pressure sensor is made of copper alloy shell, and the test fixture is made of aluminum alloy.

3. The micro-range test fixture used in a steady-state strong magnetic field according to claim 1, characterized in that: The left displacement amplifier and the right displacement amplifier are both flexible hinge displacement amplifiers.

4. The micro-range test fixture used in a steady-state strong magnetic field according to claim 1, characterized in that: The left blocking clamping plate and the left spring fixing plate are integrally formed, and the right blocking clamping plate and the right spring fixing plate are integrally formed.

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