一种BTTZ电缆氧化镁粉电阻率测量装置
By designing a BTTZ cable magnesium oxide powder resistivity measuring device that includes a pressure sensor and vacuum assistance, the problem of unstable contact resistance was solved, and high repeatability and accuracy of resistivity measurement were achieved. It is suitable for resistivity measurement at different temperatures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DASHIQIAO MEIR MAGNESIUM PROD
- Filing Date
- 2026-05-09
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the measurement of magnesium oxide powder resistivity of BTTZ cables suffers from unstable contact resistance and difficulty in controlling contact pressure, resulting in large dispersion and poor repeatability of measurement results.
A device comprising a base, a measuring chamber assembly, a pressure application assembly, an electrode assembly, and a measuring instrument is designed. Through closed-loop control of a pressure sensor and a drive unit, a constant pressure is ensured that the upper electrode applies to the powder sample. Combined with vacuum-assisted sample loading and a sealed protective gas environment, the effects of ambient humidity and temperature fluctuations are reduced.
It achieves high repeatability and accuracy in resistivity measurement, reduces errors introduced by differences in sample preparation and environmental factors, and is suitable for resistivity measurement at different temperatures.
Smart Images
Figure CN224518846U_ABST
Abstract
Claims
1. A BTTZ cable magnesia powder resistivity measuring device, characterized by, include: Base (1); The measuring chamber assembly, fixed on the base (1), includes a lower electrode seat (15) and an insulating measuring cylinder (12) detachably mounted on the lower electrode seat (15). A lower electrode (14) is fixedly mounted on the top of the lower electrode seat (15), and the inner cavity of the insulating measuring cylinder (12) forms a measuring chamber (13) for accommodating magnesium oxide powder samples. The pressure application assembly includes a stand (2) fixed on the base (1), a pressure drive unit (3) mounted on the stand (2), and a pressure sensor (4) connected to the output end of the pressure drive unit (3). The electrode assembly includes an upper electrode (8) and an upper electrode connecting rod (6). The upper end of the upper electrode connecting rod (6) is connected to the pressure sensor (4), and the lower end is connected to the upper electrode (8). The upper electrode (8) is located directly above the measuring chamber (13). The measuring instrument has two measuring terminals that are electrically connected to the upper electrode (8) and the lower electrode (14), respectively.
2. The BTTZ cable magnesium oxide powder resistivity measuring device according to claim 1, characterized in that, The insulating measuring cylinder (12) is provided with an air extraction hole (16) on its side wall or bottom.
3. The BTTZ cable magnesia powder resistivity measuring apparatus according to claim 1, characterized by, The lower electrode holder (15) is equipped with a heating element and a temperature sensor.
4. The BTTZ cable magnesia powder resistivity measuring apparatus according to claim 1, characterized by, It also includes a sealing cover (9), which can cover the measuring cavity assembly and the upper electrode (8) and form a sealed space with the base (1). The sealing cover (9) is provided with an air inlet (10) and an air outlet (11).
5. The BTTZ cable magnesia powder resistivity measuring apparatus according to claim 1, characterized by, A centering guide sleeve (7) is fixedly installed at the upper port of the insulating measuring cylinder (12), and the upper electrode connecting rod (6) can slide through the centering guide sleeve (7).
6. The BTTZ cable magnesia powder resistivity measuring apparatus according to claim 1, characterized by, The insulating measuring cylinder (12) is fixed to the lower electrode base (15) by means of threaded connection or snap-fit connection.
7. The BTTZ cable magnesia powder resistivity measuring apparatus according to any one of claims 1 to 6, characterized by, The pressure drive unit (3) is a ball screw mechanism driven by a precision stepper motor, an electric push rod or a cylinder; the pressure drive unit (3) and the pressure sensor (4) are electrically connected to a controller (5), which is used to control the output pressure of the pressure drive unit (3) in a closed loop according to the feedback signal of the pressure sensor (4).