Waterproof resistance strain gauge and preparation method thereof
A technology of resistance strain gauge and strain gauge, which is applied in the field of strain gauge, can solve the problems of inconspicuous waterproof effect, discrepancy in test results, complicated process, etc., and achieve the effect of superior waterproof performance, low moisture absorption rate, and low thermal expansion coefficient
Inactive Publication Date: 2017-12-05
ZHONGHANG ELECTRONICS MEASURING INSTR
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Problems solved by technology
This kind of protection process is complex and requires two or more layers of protection to meet the waterproof requirements. The efficiency is low, and the coating process takes a long time. There is also a risk of strain gauge damage during the coating process of glue on the surface of the strain gauge, and the process is complicated. , the waterproof effect is not obvious
In addition, the coated adhesive produces additional strain on the strain gauge, and the zero point drift will occur during the measurement process, which will cause discrepancies in the test results
Method used
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[0028] The present invention also discloses a preparation method of the above-mentioned waterproof resistance strain gauge, comprising the following steps:
[0029] Step 1: Ultrasonic cleaning is performed on the surface of the strain gauge body with a thickness of 20-45 μm, and the strain gauge body is a polyimide Mo substrate strain gauge.
[0030] Step 2, welding lead wires on the strain gauge body, and cleaning the welding parts; the specific process is to apply solder paste on the solder joints, then weld the lead wires, and finally clean the welding parts with acetone, methyl ethyl ketone or alcohol.
[0031] Step 3, coating a modified epoxy resin material or a modified polyurethane resin on the back of the strain gauge body, and curing in an environment of 120-175°C;
[0032] Step 4, spraying fluororesin material on the front of the strain gauge body to form a waterproof fluororesin layer;
[0033] Step 5: Coat the water-resistant flexible injection molding material or...
Embodiment 1
[0036] A strain gauge body with a thickness of 20 μm is selected, and its surface is cleaned. The strain gauge body is a polyimide Mo substrate strain gauge.
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The invention discloses a waterproof resistance strain gauge and a preparation method thereof. The waterproof resistance strain gauge comprises a strain gauge body; a protection layer and a base, which are disposed on the outer part of the strain gauge body in a sleeved manner. The protection layer is disposed on the front surface of the strain gauge body, and the base is disposed on the back surface of the strain gauge body. The outer part of the protection layer is provided with a sealing layer, and a lead wire passes through the protection layer, and is extended outwards. The strain gauge body is a polyimide film base strain gauge, and the base adopts water-resistant macromolecule adhesive materials. The protection layer is a water-resistant fluororesin coating, and the sealing layer adopts a water-resistant flexible injection molding material or flexible waterproof potting coating adhesive film. The waterproof resistance strain gauge has advantages of simple structure, small size, waterproof function, applicability in underwater environment, and accurate, stable, and fast stress analysis. The preparation method is used for preparing the strain gauge suitable for being used in the underwater environment, and the stress analysis is carried out, and in addition, a preparation process is simple.
Description
technical field [0001] The invention belongs to the technical field of strain gauges, and relates to a waterproof resistance strain gauge, and also relates to a preparation method of the strain gauge. Background technique [0002] At present, in the stress test of the underwater environment, it is widely used to protect the external structure of the strain gauge and the lead wire after the patch. The most commonly used method is to use glue to coat the surface of the strain gauge and the lead wire. This kind of protection process is complex and requires two or more layers of protection to meet the waterproof requirements. The efficiency is low, and the coating process takes a long time. There is also a risk of strain gauge damage during the coating process of glue on the surface of the strain gauge, and the process is complicated. , the waterproof effect is not obvious. In addition, the coated adhesive will generate additional strain on the strain gauge, and the zero point ...
Claims
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Login to View More IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 晏志鹏吴梅赵家辉赵凯锋雒平华
Owner ZHONGHANG ELECTRONICS MEASURING INSTR