Fastener heating rod

Heating rod (with grounding wire)

A heating rod, also known as a single head electric heating tube or a bullet tube electric heating element, is a type of electric heating tube (tubular electric heating element). In the Chinese electric heating industry, there is a long known model: M3. In the late 1990s, due to the widespread use of electric heating tubes in China, there were many shapes of electric heating tubes. In southern China, this type of electric heating tube used for molds with one end output was called a single head electric heating tube or a single end electric heating tube, which is very vivid.
In foreign countries, it is called a bullet tube heater, which is also a visual term because the bullet tube shell is cylindrical and one end is blocked, which is a clever coincidence with China's single head electric heating tube.
Application scope of single head electric heating tube:
1. Mold heating has been widely accepted by customers in modern industrial applications.
2. In the plastic mechanical heating system.
3. Medical production line.
4. Laboratory heat treatment test.
5. In the field of chemical engineering, etc.
The benefits of single head electric heating tube:
1. Small diameter, can reach 3-25mm.
2. The length is not limited and can reach 20-2000mm.
3. High power, 2-5 times the power of normal electric heating tubes, can be achieved by single ended electric heating tube factories (surface area of 20 watts/square centimeter), and even by foreign countries (surface area of 60 watts/square centimeter).
The difference between single head electric heating tube and ordinary electric heating tube:
1. Appearance: A single head electric heating tube has one (one) outlet, while a regular electric heating tube has two outlets.
2. Internal structure: The winding method of a single head electric heating tube is different from that of a regular electric heating tube, especially with the current imported single head electric heating tube, which has significant differences from regular electric heating tubes.
3. Production process: The production process of a single head electric heating tube involves more techniques than ordinary electric heating tubes, such as shrinking the tube, which ensures that the single head electric heating tube has higher power and longer service life than ordinary electric heating tubes.
Performance requirements for single head electric heating tubes:
1. Heating time
Under the test voltage, the time for the component to rise from the ambient temperature to the test temperature should not exceed 15 minutes
2. Rated power deviation
Under sufficient heating conditions, the deviation of the rated power of the component should not exceed the range specified below;
For components with a rated power of 100W or less: ± 10%.
For components with a rated power greater than 100W, the higher of+5% to -10% or 10W shall be taken.
3 Leakage current
The leakage current in cold state and after water pressure and sealing tests should not exceed 0.5mA
The thermal leakage current at working temperature should not exceed the calculated value in the formula, but Z should not exceed 5mA
I=1/6（tT×0.00001）
I - Thermal leakage current mA
T-heating length mm
T-working temperature ℃
When multiple components are connected in series to the power supply, a leakage current test should be conducted on this group of components as a whole.
4 Insulation resistance
During factory inspection, the cold insulation resistance should not be less than 50M Ω
After the sealing test, the insulation resistance after long-term storage or use should not decrease to M Ω
The thermal insulation resistance at working temperature should not be lower than the calculated value in the formula, but Z should not be less than 1M Ω
R=「（10-0.015T）/t」×0.001
R - Thermal insulation resistance M Ω
T-heating length mm
T - Working temperature ℃
5. Insulation and voltage resistance strength
The component should be maintained for 1 minute under the specified test conditions and voltage without any flashover or breakdown phenomenon
6. Ability to withstand power on and off
The component should be able to withstand 2000 power on/off tests under the specified test conditions without damage
7 Overload capacity
The component should withstand 30 cycles of overload test under specified test conditions and input power without damage
8 Heat resistance
The component should withstand 1000 cycles of heat resistance test under the specified test conditions and voltage without damage.