Engineering Hardware for Cold Storage Applications in New Zealand

Coolroom sliding doors are designed to move smoothly while supporting heavy insulated panels. These systems are widely used in food production, hospitality, agriculture, and commercial storage facilities throughout New Zealand.

A typical coolroom sliding door operates using a top-hung track system combined with a bottom guide mechanism. This arrangement allows the door to slide easily while remaining stable and properly aligned.

Main Components of a Coolroom Sliding Door System

A coolroom sliding door relies on several key engineering hardware components:

1. Top Track (Overhead Rail)

Cool Room Door Track

Supports the full weight of the door.
Provides a smooth running surface for the rollers.
Designed for durability in commercial and refrigerated environments.

The top track carries the structural load of the sliding door.

2. Hanging Roller Assemblies (Left-Hand and Right-Hand)

Large Hanging Roller Assembly Grey Lh 246Mm X 76Mm 55Mm Wheel

Each end of the door panel is fitted with a hanging roller assembly:

One left-hand roller assembly
One right-hand roller assembly
Large 55mm diameter wheels for smooth rolling action
Heavy-duty construction for insulated coolroom door panels

Function of the Top Rollers

Suspend the door from the overhead track.
Allow smooth horizontal movement.
Maintain consistent alignment along the rail.
Carry the full operating weight of the door.

Vertical Adjustment

The top roller assemblies can be adjusted:

Up and down
Fine-tuned during installation
Used to set correct floor clearance
Used to align the door evenly within the opening

This adjustment ensures smooth travel and correct positioning.

3. Bottom Guide Track (With Leg)

Sliding Door Guide Track With Leg 81X57Mm X 5M

At the base of the door:

A guide track is mounted to the lower edge of the panel.
Provides lateral stability during operation.
Prevents the door from swinging outward.

Sliding doors rely on this lower guide to maintain controlled movement.

4. Floor-Mounted Guide Bearing

Floor Mount Door Guide 32Mm X 150Mm X 50Mm

Installed on the floor beneath the doorway:

Contains a bearing that runs inside the bottom guide track.
Controls side-to-side movement.
Keeps the door travelling in a straight path.

Adjustable Floor Guide

The floor-mounted guide includes slotted fixing holes that allow:

In-and-out adjustment
Left-to-right adjustment

These slots enable precise alignment during installation and allow for later adjustment if required.

How the System Works Together

When operating a coolroom sliding door:

The door is suspended from the top track via two roller assemblies.
The rollers carry the full weight of the door.
As the door slides:
- The top rollers move along the overhead rail.
- The bottom guide track passes around the fixed floor-mounted bearing.
The guide bearing controls lateral movement and prevents misalignment.
Vertical adjustment of the rollers ensures correct door height and smooth operation.