DC actuator/correction actuator model: BRL10-200-700-T-YS

DC motor: 24V
Travel distance: ± 5075100mm
Thrust: 700N
Weight: 5kg
Protection level: IP54
Working temperature: 0-60 ℃
Environmental humidity: 5-90%

Metal High Temperature Thermal Conductivity Tester Metal High Temperature Thermal Conductivity Tester Thermal Conductivity Tester Model: HAD-DRJ-II

1overview

This instrument is suitable for measuring the thermal conductivity of metals or alloys at non phase transition temperatures within the temperature range of 80 ℃ to 900 ℃. Meets the requirements of GB/T3651-2008 "Measurement Method for High Temperature Thermal Conductivity of Metals" standard. Widely used in production enterprises, scientific research institutions, quality inspection and other departments.

IISpecification

1. Test temperature range: 80 ℃ to 900 ℃;

2. Thermal conductivity range: 5-400W/mk;

3. DC stabilized power supply: 0-60A; 0～10V；

4. Sample size: Rod shaped sample: ￠ (3-5) × 220 (mm);

Filamentous sample: ￠ (1-3) × (20-45) (mm);

5. Relative error: ≤ ±5％；

6. Sample oxidation protection method: vacuum+atmosphere;

7. Power supply: 220V/50Hz; Power ≤ 2KW;

8. Computer measurement control, automatic generation of reports.

9. The maximum temperature of the electric furnace used is 1000 ℃.

IIIIntroduction to Structural Principles

This instrument consists of an environmental heating system, a cooling system, a vacuum atmosphere system, a sample heating system, a measurement control system, and a computer system.

When a rod-shaped sample is subjected to direct current, the Joule heat generated is mainly conducted longitudinally to both ends of the sample. After reaching a stable state, it is considered that there is one-dimensional longitudinal heat flux on the sample, and the heat exchange between the sample and the lateral environment is corrected. The thermal conductivity (λ) of the sample is calculated according to the following formula:

IVL

λ=0.6364×———————— ---------(1)

d²(△₁-εN)

In the formula:

λ - thermal conductivity of the sample, in watts per meter, Kelvin w/(m.k);

L - Average length of the working range of the sample, in millimeters (mm);

I - Current flowing into the sample, unit: Ampere (A);

V - Average voltage drop in the working range of the sample, measured in millivolts (mV);

D - Sample diameter, in millimeters (mm);

△₁---The average temperature difference between the midpoint and two endpoints of the working range of the sample, measured in (℃);

ε - a coefficient reflecting the magnitude of lateral heat exchange;

N - The function of the temperature difference between the specimen and the lateral environment, in degrees Celsius (℃)

△₁、 ε. N is calculated by the following formula:

△₁= t₁ - ---------------------------(2)

△₂= t′₁ - -------------------------(3)

N= t′₂ - t₂+ - -----------------(4)

= t₀₂- -----------------------------(5)

=t₀₂- -------------------------------(6)

N₀= - t₀₂ + - ---------------------(7)

ε= -------------------------------------(8)

In the formula:

t₁、 t₂、 t₃The temperature at the endpoint, midpoint, and other endpoint of the sample when powered on, measured in degrees Celsius (℃);

t′₁、 t′₂、 t′₃--------The temperature at the endpoint, midpoint, and other endpoint of the direction finding environment when the sample is powered on, measured in degrees Celsius (℃);

t₀₁、 t₀₂、 t₀₃The temperature of the sample endpoint, midpoint, and other endpoint when the sample is not powered on, in degrees Celsius (℃);

t₀₁′t₀₂′t₀₃When the sample is not powered, the temperature at the endpoint, midpoint, and other endpoint of the direction finding environment is measured in degrees Celsius (℃);

△₁⁰The average temperature difference between the midpoint and two endpoints of the sample when it is not powered on, measured in degrees Celsius (℃);

△₂⁰The average temperature difference between the midpoint and two endpoints of the lateral environment when the sample is not powered on, measured in degrees Celsius (℃);

△₂The average temperature difference between the midpoint and two endpoints of the direction finding environment when the sample is powered on, measured in degrees Celsius (℃)

N₀The function of the temperature difference between the sample and the lateral environment when the sample is not powered, in degrees Celsius (℃)

The average temperature of the sample is determined by the following formula:

t = t₂ - -------------------(9)

7.2 By substituting the measured average values for equations (1) to (9), the measured thermal conductivity of each experimental point can be obtained.

7.3 Based on the measured values of thermal conductivity at various temperatures, use a graphical method to calculate the relationship between temperature and thermal conductivity, and obtain the corresponding values of thermal conductivity at a certain temperature. Prepare the formal results and issue a report.

4Installation and commissioning

（1） Software installation

1Install Microsoft Office 2003 software with Excel 2003 and Access 2003

Install the metal high-temperature thermal conductivity testing software, double-click the Setup. exe file under the installation package folder, and follow the prompts to complete the software installation.

（2） Installation of equipment

1. Connect the device power supply.

2. Connect the device communication cable to the computer.

3. Connect the cooling water pipe.

4. If atmosphere protection is required, please connect the protective gas properly.

5、 Experimental operation

1. When the tested sample is rod-shaped, the diameter is ￠ (4-5) mm, the length is 220mm, and extension rods are added at both ends to a total length of 400mm, or the sample length is taken as 400mm. When the tested sample is filamentous, the diameter is ￠ (1-3) mm, the length is 80-120mm, and extension rods are added at both ends to a total length of 400mm, or the sample length is taken as 400mm.

2. Weld three nickel chromium nickel silicon thermocouples with a wire diameter of 0.15-0.3mm on the same axis surface at the midpoint and 20-45mm away from the midpoint of the sample rod.

3. Wrap insulation material on the surface of the sample, install three environmental thermocouples corresponding to the sample thermocouples at a distance of 12-27mm from the centerline of the sample (i.e. the distance between the environmental thermocouples and the centerline of the sample should be less than 0.6L), and then wrap another layer of insulation material.

4. Install the sample on the sample holder, connect the thermocouple lead wires, cover the electric furnace, and close the vacuum cover.

5. Turn on the cooling water.

Turn on the power switch, turn on the computer, start the testing software, set the temperature value of the electric furnace, start heating, turn on the heating switch, enter the sample diameter and the length of the sample working area, press the "confirm" button, if you need to protect the sample, please turn on the vacuum pump and gas protection, then press the "start experiment" button, and the instrument will enter automatic testing mode.

7. When the ambient temperature of the sample reaches a stable state, the computer prompts to add direct current. According to the prompt, the sample temperature is balanced with the ambient temperature, and the computer automatically calculates the thermal conductivity.

8. The thermal conductivity test at this temperature point is complete. You can set other temperatures and follow the above steps to test. Press the "Generate Report" button to automatically generate a report.

6、 Precautions

1After welding the thermocouple on the sample, it is necessary to install the instrument on the sample and add some current to heat it. The temperature values of the three thermocouples should not differ much during the heating process, otherwise there may be welding problems with the thermocouples and they need to be re welded.

2The temperature difference between the midpoint and two endpoints of the sample should generally be controlled within the range of 10-50 ℃. Testing requirements can be achieved by using sample extension rods of different materials or sizes, installing sample heaters at both ends, or changing the length of the sample working area.

7、 Packing list

1. 1 host

2. 1 set of testing software

3. 1 set of computer (according to contract requirements)

4. 1 set of supporting manuals

5. 1 certificate of conformity

Product related keywords: DC actuator, correction actuator