Busbar Heat Shrink Tube Heating Tunnel Oven

The Busbar Heat Shrink Tube Heating Tunnel Oven is a continuous, high-efficiency automated heating and forming equipment specially designed for the heat shrinkable insulation sleeves applied to copper or aluminum busbars in high and low voltage electrical cabinets and substations.The equipment uses a conveyor system to transport busbars fitted with heat shrink tubes at a constant speed into a closed heating tunnel. Through far-infrared radiation heating or hot air circulation, the heat shrink tube is uniformly heated and tightly shrunk around the surface of the busbar, achieving reliable insulation protection.

Core Applications

High and Low Voltage Switchgear Industry

Used for long-distance insulation covering of copper and aluminum busbars with various specifications inside distribution cabinets and switch cabinets.

New Energy Vehicle Industry

Used for insulation heating of battery pack (PACK) internal cell connection busbars and electric drive busbars.

Rail Transit and Transformer Industry

Used for protection of busbars in locomotive traction power supply systems and large-scale transformer outlet copper bars.

Applicable Manufacturing and Safety Standards

The design and production of the equipment generally need to strictly comply with the following industrial standards:

GB/T 10067.1 / GB/T 10067.4

Basic technical requirements for electric heating equipment in China, including general requirements and indirect resistance furnace specifications.

GB 5226.1 / IEC 60204-1

Safety of machinery — Electrical equipment of machines — General technical requirements.

CE Certification

For export applications, the equipment should comply with European safety and electromagnetic compatibility requirements.

Insulation Withstand Voltage Standards

The insulation layer of the heated busbar should meet insulation strength testing requirements according to:

GB/T 1408

Core Equipment Features

360° Uniform Heating Performance

Uses multi-directional far-infrared thermal radiation or specially designed mesh conveyor processes to completely solve problems caused by traditional manual heat gun heating, such as surface bubbles, pressure marks, and uneven heating.

Precise Temperature Control and Variable Speed Regulation

Adopts a high-precision PID intelligent temperature control system with temperature accuracy within ≤ ±1°C. The conveyor speed can be continuously adjusted to perfectly match heat shrink tubes of different thicknesses.

High Efficiency, Energy Saving, and Safety

The middle layer of the oven chamber is filled with thick high-temperature insulation cotton (temperature resistance up to 1200°C), effectively reducing heat loss, lowering external surface temperature, protecting operators from burns, and significantly reducing energy consumption compared with conventional ovens.

FAQ

Q1: What is the typical heating temperature setting for this type of tunnel oven?

A: The temperature depends on the busbar voltage level.

For ordinary low-voltage copper busbars (such as 1 kV systems), the heat shrinking temperature is usually set at around 120°C.

For thick-walled high-voltage copper busbars (such as 10 kV–35 kV systems), the temperature generally needs to be set between 170°C and 200°C.

Q2: How does tunnel oven heating prevent bubbles or burning on the heat shrink tube surface?

A: Bubbles are usually caused by excessively rapid local heating, which prevents trapped air from escaping. The problem can be solved through gradient temperature control with preheating zone, main heating zone, and cooling zone, combined with variable-frequency speed control to slow down conveyor movement, allowing the heat shrink tube to gradually and evenly shrink from the inside outward.

Q3: Can this equipment heat irregular or bent copper busbars?

A: Yes. The inlet and outlet height and width of busbar tunnel ovens can usually be customized according to product dimensions. The internal structure often adopts suspended chain conveyors or wide stainless steel mesh belts, allowing bent and three-dimensional formed busbars to pass smoothly through the heating chamber.

Q4: What are the main advantages compared with traditional ovens and heat guns?

A: The key advantages are improved efficiency and production consistency.

Traditional heat guns rely entirely on manual operation, resulting in slow processing speed and a high risk of overheating or burning. The tunnel oven operates as a continuous production line, requiring only 2–3 operators to achieve daily production of several tons of copper busbars, with excellent appearance quality and high product consistency.

Q5: What materials are commonly used for the conveyor belt? Will long-term high-temperature operation damage it?

A: Common conveyor materials include:

SUS304 stainless steel mesh belts/chains

High-temperature-resistant PTFE (Teflon) mesh belts

These materials can withstand long-term operation in high-temperature environments of approximately 250°C–350°C, with excellent deformation resistance and a long industrial service life.