Multi stage lifting garage door

一,Product Overview
Segmental Garage Door, also known as sectional lift door or sliding lift door, is an industrial and civilian door product that is horizontally assembled from multiple door panels, vertically opened along the track, and finally laid flat under the ceiling. Compared with traditional flip over garage doors, multi-stage lift doors do not protrude outward during opening, do not occupy space in front of the garage door, and provide larger passage width and better sealing performance.
This product is widely used in residential garages, commercial buildings, industrial plants, logistics and warehousing centers, automobile 4S stores, fire stations and other places. It has multiple advantages such as thermal insulation, wind and dust prevention, silent operation, safety and reliability, and is an ideal choice for modern building entrances and exits.

二、 Working principle
The core working principle of multi-stage lifting garage doors lies in their unique track system and door panel hinge structure:
1. Vertical ascent stage: With the assistance of the torsion spring balance system, the door panels slide upwards along the vertical tracks on both sides, and each door panel is connected by hinges for flexible bending.
2. Horizontal transition stage: When the door panel rises to the top of the door opening, the track smoothly transitions from the vertical section to the horizontal section, and the door panel smoothly turns into the horizontal track.
3. Ceiling laying stage: All door panels are finally laid flat below the garage ceiling, without occupying any space inside the garage.
This opening method allows vehicles to park close to the door opening, greatly improving space utilization, especially suitable for residential and commercial places with tight parking spaces.

三、 Core advantages
3.1 Efficient Utilization of Space
The multi-stage lifting door opens vertically, and the door panel is ultimately stored under the ceiling, without the need to reserve an opening radius in front of the door. The vehicle can be parked directly at the edge of the doorway, making full use of the interior and exterior space of the garage. Compared to traditional flip doors, the width of passage can be increased by about 10% -15%.
3.2 Thermal insulation performance
The door panel is made of double-layer galvanized steel plate (or aluminum alloy, stainless steel) with a fluorine free polyurethane (PU) hard foam insulation layer filled in the middle. The thickness of the door panel is 40mm-50mm, with low thermal conductivity and excellent insulation performance. Flexible sealing strips are installed between sections to effectively prevent cold and hot air convection, suitable for cold climates and places with insulation requirements.

3.3 Sealed dustproof and waterproof
The bottom of the door is equipped with anti freezing rubber sealing strips, which can adapt to low temperature environments and maintain flexibility, effectively blocking rainwater, dust, and insect invasion. Both sides of the track are equipped with built-in brushes or rubber seals, and there is a top sealing strip at the top, forming a comprehensive sealing system with high wind resistance.
3.4 Silent operation
Adopting sealed ball bearing rollers and galvanized steel track system, it runs smoothly and steadily. Combined with a variable frequency soft start motor, the opening and closing speed is adjustable from 0.12-0.25m/s, and the operating noise is below 55 decibels (A-weighted), which meets the noise control requirements of residential and commercial areas.
3.5 Safety and reliability
Equipped with multiple safety protection devices: torsion spring breakage protection device to prevent the door from falling; Wire rope fracture protection; Infrared safety light curtain detects automatic rebound of obstacles; Anti pinch door panel design to protect personnel safety; When the power is cut off, it can be manually released and turned on. The automatic locking system has strong anti-theft performance when the steel pin is inserted into the side rail for locking when the door is completely closed.
3.6 Sturdy and Durable
The door panel is made of color steel plate, aluminum alloy or stainless steel material, and the surface is treated with polyester coating, which has strong corrosion resistance and weather resistance. The torsion spring is made of high-quality spring steel, and its service life can reach tens of thousands of times after fatigue testing. The overall structural design has a long service life and low maintenance costs.

四. Technical Specifications

The table below lists the main technical specifications and parameters of this product:

五、 Structural decomposition
The multi-stage lifting garage door consists of the following six core components, which work together to ensure the safe and smooth operation of the door body:

5.1 Door Panel
The door panel is a sandwich structure of double-layer metal panels sandwiched with polyurethane foam. The height of a single piece is usually around 500mm, and the surface can be treated with flat, embossed or wood grain embossing. The door panels are connected by hinges, allowing for flexible bending. The anti pinch hand type door panel adopts a special arc design at the joint to prevent fingers from being pinched.
5.2 Track System
Made of galvanized steel material, divided into vertical and horizontal sections, connected by curved transition sections. The thickness and strength of the track are selected based on the size and weight of the door to ensure safe load-bearing. The low space improvement plan can reduce the door lintel space requirement to a minimum of 160mm.
5.3 Torque Spring Balance System
The torsion spring is installed on the transmission shaft above the door opening and connected to the bottom of the door body through a steel wire rope to balance the weight of the door body. High quality torsion springs can keep the door balanced at any position, and can be easily lifted with one hand during manual operation. Usually, a 200-250mm installation space needs to be reserved above the torsion spring.
5.4 Rollers
Adopting sealed ball bearing rollers, the outer ring is made of nylon or steel, which runs smoothly, wear-resistant, and has low noise. The roller is embedded in the track and rolls to ensure the precise trajectory of the door body.
5.5 Seals
Including bottom anti freezing rubber sealing strip, track brushes/rubber seals on both sides, top sealing strip, and flexible sealing between segments, a complete sealing system is formed to achieve wind, dust, water, and insulation functions.
5.6 Driver Motor (Operator)
Equipped with industrial grade door opening motor, supporting multiple control methods such as remote control, wall switch, automatic induction, etc. It has functions such as rebound when encountering obstacles, automatic delayed closure, and manual release. Optional battery backup power supply to ensure operation in case of power outage.
六、 Application scenarios
Residential Garage: Suitable for private garages in detached villas and row houses, with beautiful appearance, quiet operation, high safety, and improved residential quality.
Commercial buildings: suitable for underground garage entrances and exits of commercial complexes, office buildings, and hotels, with stable and reliable high-frequency use.
Industrial plant: suitable for entrances and exits of production workshops and equipment rooms, with insulation and dust prevention to meet industrial environmental requirements.
Logistics warehousing: suitable for loading and unloading ports in warehouses and logistics centers, customized in large sizes, and convenient for forklift access.
Car 4S dealership: suitable for car showrooms and repair workshops, with a clean appearance and quick opening, enhancing brand image.
Fire Station: Suitable for fire station garages, with quick opening and large passage design to ensure emergency dispatch of fire trucks.
七、 Customized options
This product supports comprehensive customization to meet the personalized needs of different customers:
⊙ Size customization: Customized production based on the actual size of the customer's door opening, with a maximum width of 8000mm and a maximum height of 6000mm.
Color customization: Standard colors include white, light gray, dark gray, beige, brown, and support RAL color card customization and wood grain texture transfer printing.
Windows optional: Rectangular or arched windows (acrylic or tempered glass) can be added to the door panel to increase natural lighting.
⊙ Drive mode:

                                                          Product Parameters

● Door material: High-end garage doors usually use high-quality materials, such as hot-dip galvanized sheet, aluminum alloy, solid wood, etc. 
● Hardware accessories: The quality of hardware accessories is crucial to the performance and service life of garage doors. Hardware accessories of high-end garage doors usually include guide rails, rollers, door hinges, and wire reels. The guide rails and door hinges are made of 1.5mm Baosteel cold-rolled steel plates with silver electroplating on the surface. The rollers are made of high-strength, wear-resistant polymethyl methacrylate (POM) engineering plastics with embedded ball bearings. The wire reel is made of high-strength aluminum alloy. 

● Balance system: The balance system is crucial to the opening and closing process of the garage door. High-end garage doors usually use a torsion spring balance system. The torsion spring material is added with 65 manganese or 60si2Mn imported spring steel to ensure a service life of more than 80,000 cycles. The balancing system casing is made of galvanized steel pipe. A torsion spring break protection device is installed on the balance shaft to prevent the door panel from falling. 
● Sealing system: In order to ensure good airtightness between the door body and the building, high-end garage doors are equipped with sealing strips on the top and both sides of the door opening, and airbags and sealing wings at the bottom of the door body.