Vacuum Lifters & Glazing Robots

A vacuum lifter is a lifting device that holds a load by suction. One or more rubber pads are pressed against a smooth, airtight surface, a pump or ejector removes the air between pad and load, and the difference between atmospheric pressure outside and the low pressure inside the pad holds the load firmly. Vacuum lifters are hung from cranes, excavators, telehandlers and hoists, or built into dedicated machines, and they are used to lift glass, stone slabs, kerbs, paving, pipes, steel plates, panels and many other materials without hooks, slings or clamps.

A glazing robot is a compact, usually battery-powered machine that combines a vacuum lifting head with a manipulator able to tilt, rotate and shift the load. It lets a small team lift and position heavy glass panes, windows and panels precisely, often indoors or in places where a crane cannot reach. Both types of equipment reduce manual handling, one of the main causes of injury in glazing, paving and building work.

Brief History of Vacuum Lifters and Glazing Robots

Suction cups for handling glass by hand have been used for a long time, and industrial vacuum lifting spread in manufacturing during the twentieth century, especially in glass, sheet metal and panel production. As cranes and hydraulic machines became common on sites, vacuum lifting devices designed to hang from a hook or an excavator quick coupler were developed for construction materials such as paving slabs, kerbs, concrete elements and pipes.

Glass sizes and weights increased steadily in modern architecture, with large double and triple glazed units that are far too heavy to handle by hand. From the late twentieth century, manufacturers began combining vacuum heads with powered manipulators on small wheeled or tracked carriers. These glazing robots, and similar devices mounted on mini cranes, telehandlers and aerial platforms, became widely used in the glazing and curtain wall industries. Battery power, radio remote controls, wireless vacuum monitoring and compact counterbalanced designs have made them suitable for work inside finished buildings and on upper floors.

How Vacuum Lifters and Glazing Robots Work

Vacuum pads. Rubber or foam-sealed pads grip the surface. Pad size, number and layout are chosen for the load’s weight, dimensions and surface.
Vacuum generation. An electric or battery pump, a venturi ejector driven by compressed air or, on some devices, a mechanical pump creates the vacuum. A reservoir and non-return valves maintain it for a period if the power fails.
Monitoring. A vacuum gauge, warning lights and audible alarms show when the vacuum is sufficient to lift safely and warn if it drops.
Frame and suspension. A frame carries the pads and connects to the crane hook, excavator coupler or machine. Many frames rotate and tilt, manually or with power.
Glazing robot carrier. The robot is a compact wheeled or tracked machine with a counterweight, or with outriggers, and a boom or mast that lifts the vacuum head.
Manipulator functions. Hydraulic or electric actuators provide lift, reach, side shift, tilt and rotation, so the operator can place a pane into its frame with millimetre adjustments.
Controls. Most robots are controlled by a handset or radio remote control, letting the operator stand where the view of the installation is best.

Types of Vacuum Lifters and Glazing Robots

Hand-Held Suction Lifters

Manual suction cups with a lever or pump, used in pairs or groups to carry glass and panels by hand.

Below-the-Hook Vacuum Lifters

Frames with pads and a self-contained vacuum system, hung from a crane, hoist or mini crane. They handle glass, cladding panels, stone and steel sheets.

Excavator and Telehandler Vacuum Lifters

Vacuum devices attached to an excavator, loader or telehandler, widely used for laying pipes, kerbs, paving slabs and concrete elements.

Tube Lifters

Vacuum hose lifters for repetitive handling of sacks, boxes and panels, mainly in workshops and factories.

Glazing Robots

Self-contained machines on wheels or tracks with a counterweighted boom and powered vacuum head, used for installing windows, doors, glass partitions and curtain wall units.

Vacuum Attachments for Other Machines

Glazing manipulators mounted on mini cranes, spider cranes, forklifts, telehandlers or aerial platforms, extending their use to glass installation.

Capacity Classes

Type	Typical capacity	Typical use
Hand-held suction lifter	about 50 to 120 kg per cup	Carrying glass and panels by hand
Compact glazing robot	about 150 to 600 kg	Windows, doors and interior glazing
Large glazing robot	about 600 to 1,500 kg	Heavy glazing units and curtain wall
Below-the-hook lifter	from a few hundred kg to several tonnes	Glass, panels, stone and steel
Excavator vacuum lifter	from about 500 kg to several tonnes	Pipes, kerbs, paving and slabs

Figures are indicative.

Accessories

Accessories include pad sets for different surfaces and shapes, extension arms, curved and flexible pads for pipes and textured materials, powered rotation and tilt units, tool-free frame adjustment, weather covers, spare battery packs and wireless vacuum monitoring. Glazing robots may be fitted with jibs to reach under overhangs, wider tracks for stability, and non-marking tyres for finished floors.

Main Manufacturers

Schmalz, a German specialist in vacuum technology and vacuum lifters.
Wood’s Powr-Grip, a US manufacturer of vacuum lifting devices.
GGR Group, a UK company with its own glazing robots and vacuum lifters.
Smartlift, a manufacturer of glazing robots and glass lifters.
Winlet, a range of glazing robots made by the Danish company GMV.
Probst, a German manufacturer of handling equipment, including vacuum devices for paving, kerbs and pipes.

Main Uses of Vacuum Lifters and Glazing Robots

Installing windows, doors, glass partitions and balustrades.
Installing curtain wall and facade panels.
Laying pipes, kerbs, paving and natural stone.
Handling stone and quartz worktops in workshops and on site.
Handling steel plate, sheet and panels in fabrication.
Handling solar panels and roof elements.

Choosing Vacuum Lifting Equipment

Load and surface. The weight, size and surface of the load determine the pad type and number. Porous or textured surfaces may need special pads or a higher-capacity pump.
Access and ground. Doorways, floor loading, stairs and lifts decide whether a compact robot can reach the work area.
Movement needed. For installing glass into frames, tilt, rotation and side shift matter as much as capacity.
Carrier machine. Below-the-hook devices depend on a crane or machine with enough capacity for the load plus the lifter’s own weight.
Power. Battery units work anywhere but need charging, while air-driven devices require compressed air.
Training. Operators must understand vacuum principles, load charts and warning devices.
Temperature and conditions. Cold, wet or dusty conditions affect how well pads seal, so the equipment should be rated for the conditions on site.
Rent or buy. Glazing contractors with regular work often own robots, while rental companies offer a wide range for one-off installations.

Glazing Robot or Crane With Vacuum Lifter?

A glazing robot works well for ground floor and interior installations, where it can drive to the opening and place the glass with fine control, often operated by a single person with a remote control. A crane, mini crane or telehandler with a below-the-hook vacuum lifter is usually better for upper floors, heavy curtain wall units and panes that must be lifted from outside the building. On many projects both are used: the crane lifts the glass to the floor, and a robot installs it.

Safety

The key risk is a loss of vacuum, which could cause the load to fall. Vacuum lifters should have a reserve tank, clear warning devices and a safety factor between holding capacity and rated load, as required by standards such as EN 13155 for non-fixed load lifting attachments. Pads must be clean and undamaged, the surface must be suitable, and the load must be tested by lifting it slightly before moving it. Nobody should stand beneath a suspended load. Glazing robots must be used within their load chart for each boom position, on firm and level ground, with counterweights and outriggers as specified. Wind can act strongly on large panes, so wind limits must be observed outdoors.

Trends and Technology

Battery-powered systems with lithium-ion batteries now dominate new glazing robots. Wireless remote controls, digital vacuum monitoring and data logging improve safety. Manufacturers are developing lighter robots with higher capacities and longer reach, as well as vacuum heads that can be moved between robots, cranes and telehandlers. Semi-automatic positioning and sensor-assisted alignment are being explored for facade installation.

Key Terms

Vacuum pad: the sealed cup that grips the load surface.
Vacuum reserve: a tank or system that maintains vacuum for a time after power loss.
Glazing robot: a compact machine with a vacuum head and manipulator for installing glass.
Below-the-hook device: a lifting attachment hung from a crane or hoist.
Side shift: a sideways movement of the load without moving the machine.
Counterweight: mass at the rear of the robot that balances the load.

Frequently Asked Questions

How does a vacuum lifter hold a load? Air is removed between the pad and the surface, and atmospheric pressure presses the pad and load together.

What happens if the power fails? Good vacuum lifters have reserve tanks and non-return valves that hold the vacuum for a limited time, with alarms to warn the operator to lower the load.

Can vacuum lifters handle rough surfaces? Some can, using special pads and higher-capacity pumps, but smooth, airtight surfaces give the most reliable grip.

Why use a glazing robot instead of a crane? It can work indoors, on finished floors and in tight spaces where a crane cannot reach, and it provides fine control for positioning glass.