Insulating paperboard compressibility detection device

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses an insulating paperboard compressibility detection device which comprises an electronic universal material testing machine, the electronic universal material testing machine is provided with a cabinet and a cross beam, the lower portion of the cross beam is fixedly connected with an upper pressing table through an upper supporting column, and a lower pressing table is correspondingly arranged on the lower face of the upper pressing table. The lower pressing table is fixedly connected with a base through a lower supporting column. The sectional area of the upper pressing table is larger than that of the lower platform, and electronic dial indicators are symmetrically arranged on the two sides of the lower pressing table. The device is high in detection precision and strong in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of insulating product detection, and specifically relates to a compressibility detection device for insulating paper board. BACKGROUND

[0002] Insulating paper board is a raw material of main insulating components in oil-immersed transformers, mainly plays the roles of insulation and magnetic shielding in transformers, and is a very important component in transformers; the advantages and disadvantages of various indexes of insulating paper board directly relate to the advantages and disadvantages of the quality of assembled insulating parts. The compressibility index is one of the most important indexes, and insulating parts made of insulating paper board, such as main insulating components, need a certain pressure resistance strength, and many parts of the insulating parts need to be clamped after assembly, which is in a state of continuous stress. If the insulating parts are compressed and deformed too much after stress, the insulating parts may not meet the design requirements of the transformer, and thus the compressibility index is very important. The national standard "GBT 19264.2-2013 Electrical Press Paperboard and Thin Paperboard Part 2" stipulates that the sample height of the compressibility of the insulating paper board is 25mm-50mm, the area is 25mm*25mm, and the deformation amount during the 20MPa pressure maintaining period accounts for the proportion of the original height of the sample.

[0003] At present, the compressibility of the insulating paper board is usually detected by an electronic universal material testing machine, and the height difference data of the insulating paper board before and after the detection is obtained from the displacement data of the beam of the tensile testing machine. The national standard does not require that the experimental process of the insulating paper board requires a 20MPa pressure, and the force value is about 12500N according to the 25*25mm area. Under this pressure, the beam will produce a certain reverse elastic deformation, which will cause the displacement data of the beam to be larger than the actual deformation of the sample. Even if the displacement error of the beam is 0.5mm, the experimental result will be 12%-33% higher, and thus how to more accurately detect the compressibility of the insulating paper board has become a problem to be solved in the industry. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a compressibility detection device for insulating paper board, which overcomes the defects in the prior art, avoids the detection error caused by the deformation of the beam of the tensile testing machine after stress, has high detection precision, and is practical.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] The utility model provides an insulating paperboard compressibility detection device, including electronic universal material testing machine, electronic universal material testing machine is equipped with cabinet and crossbeam, the lower part of crossbeam is fixedly connected with upper pressure platform through upper support column, the lower surface of upper pressure platform is correspondingly provided with lower pressure platform, and the lower pressure platform is fixedly connected with base through lower support column, the cross section area of upper pressure platform is larger than the cross section area of lower pressure platform, and the both sides of lower pressure platform are symmetrically provided with electronic micrometer.

[0007] Preferably, the upper pressure platform is a cylindrical upper pressure platform with a diameter of 150 mm.

[0008] Preferably, the lower pressure platform is a cylindrical lower pressure platform with a diameter of 90 mm.

[0009] Preferably, the electronic universal material testing machine is a WDW-30E model manufactured by Jinan Shifeng Instrument Co., Ltd.

[0010] Preferably, the lower pressure platform is symmetrically provided with a fixed support on both sides, and the electronic micrometers are connected to the two sides of the lower pressure platform through the fixed supports, respectively.

[0011] Preferably, the top ends of the measuring rods of the electronic micrometers are on the same horizontal line, and the measuring rods are perpendicular to the upper and lower pressure platforms.

[0012] Preferably, the stroke of the measuring rod of the electronic micrometer is 0-40 mm.

[0013] Preferably, the electronic micrometer is an electronic digital micrometer of GS5331 type manufactured by Wenzhou Sanhe Measuring Instrument Co., Ltd. The electronic micrometer of this type can be connected to a PC end through a transmission line, and the control system is a FastTest universal testing machine control system. The time, micrometer deformation, and displacement data (obtained from the crossbeam displacement) can be read and the curve can be drawn through the FastTest software in the PC.

[0014] Thanks to the above technical scheme, the utility model has the advantages that:

[0015] In summary, the utility model sets the upper pressure platform to be larger than the lower pressure platform (the upper pressure platform and the lower pressure platform of the prior art have the same corresponding platform), and symmetrically sets two electronic micrometers on both sides of the lower pressure platform to detect the displacement of the upper pressure platform moving downward and to detect the compressibility of the insulating paperboard to be detected. The detection error caused by the deformation of the crossbeam of the electronic universal material testing machine during detection is effectively avoided. Therefore, the detection device has high detection precision and strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the utility model;

[0017] In the figure, 1, crossbeam; 2, upper support column; 3, upper pressing table; 4, lower pressing table; 5, lower support column; 6, base; 7, electronic micrometer; 8, measuring rod. DETAILED DESCRIPTION

[0018] The utility model is further illustrated below in combination with the drawings and examples.

[0019] Example One

[0020] As Figure 1 shown in the utility model discloses an insulating paperboard compressibility detection device, including electronic universal material testing machine (not marked out), electronic universal material testing machine is equipped with the cabinet (not marked out) and crossbeam 1, the lower part of crossbeam 1 is fixedly connected with upper pressing table 3 through upper support column 2, and the lower surface of upper pressing table 3 is provided with lower pressing table 4 correspondingly, and lower pressing table 4 is fixedly connected with base 6 through lower support column 5;The cross-sectional area of upper pressing table 3 is greater than the cross-sectional area of lower pressing table 4, and electronic micrometer 7 is symmetrically arranged on the two sides of lower pressing table 4, and the top end of the measuring rod 8 on the two electronic micrometers 7 is on the same horizontal line.

[0021] Actual detection process is as follows:

[0022] I, the insulating paperboard block to be detected is placed on lower pressing table 4, and the lower end surface of upper pressing table 3 is adjusted to contact the top of the insulating paperboard block, the pressure is controlled to be within one newton, and the measuring rod 8 of the electronic micrometer is pressed;

[0023] II, the digital display of electronic micrometer 7 is zeroed by the wired control of the FastTest control system of the computer;

[0024] III, different force value schemes are set according to different requirements of samples;Take 3.0mm thick insulating paperboard as an example for detection, cut into small blocks with an area of 25mm*25mm, stack 14 small blocks into an insulating paperboard block with a height of 42mm, and compress, first stage: initial pressure 1MPa, pressure maintaining 300 seconds, eliminating the gap between samples;The second stage uses 20MPa pressure, and the pressure is maintained for 300 seconds when the pressure reaches 20MPa;Then read the numbers on the two electronic micrometers 7, take the average value (1.970mm), which is the actual value of the deformation of the insulating paperboard.

[0025] At the same time, the compression height difference displayed by the electronic universal material testing machine through the crossbeam is 1.697mm, and the difference between the two groups of data is 0.299mm, therefore, the error caused by the detection of the crossbeam is significant, which seriously affects the detection result of the compressibility of the insulating paperboard.

[0026] It should be understood that the embodiments are only used for illustrating the present application and are not used for limiting the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various changes or modifications to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. An insulation paperboard compressibility detection apparatus, characterized by: Including electronic universal material testing machine, electronic universal material testing machine is equipped with cabinet and crossbeam, the lower part of crossbeam is fixedly connected with upper pressing table through upper support column, the lower surface of upper pressing table is correspondingly provided with lower pressing table, and the lower pressing table is fixedly connected with base through lower support column.

2. The insulation board compressibility detection apparatus of claim 1, wherein: The upper pressing table is a cylindrical upper pressing table with a diameter of 150 mm.

3. The insulation board compressibility detection apparatus of claim 1, wherein: The lower pressing table is a cylindrical lower pressing table with a diameter of 90 mm.

4. The insulation board compressibility detection apparatus of claim 1, wherein: The two sides of the lower pressing table are symmetrically provided with fixed supports, and the electronic micrometers are connected to the two sides of the upper pressing table through the fixed supports respectively.

5. The insulation board compressibility detection apparatus of claim 1, wherein: The top ends of the measuring rods of the electronic micrometers are on the same horizontal line.

6. The insulation board compressibility detection apparatus of claim 1, wherein: The electronic micrometer is an electronic digital micrometer.

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