Vacuum Lifting Frames for Manipulators

Principle, Function, and Construction of Vacuum Lifting Frames

Vacuum lifting frames enable convenient handling of sheet materials, metal plates, and panels made of glass or plastic. The gripping principle of these frames is based on creating a vacuum between the suction cup surface and the handled material. The vacuum, generated by ejectors (or a vacuum pump), allows safe gripping of the load without invasive mechanical clamping. This makes it possible to handle large smooth-surface objects safely and gently.

The construction of vacuum lifting frames consists of a steel load-bearing structure and a precisely dimensioned pneumatic system. The load-bearing frame may be welded or bolted and is equipped with a set of suction cups whose number, spacing, and type are selected according to the size and weight of the handled load.

The vacuum is typically generated by an ejector powered by compressed air, which creates negative pressure in the suction cup system. The advantage of this solution is its high reliability and simplicity. The entire system is usually equipped with a vacuum gauge, an acoustic alarm for vacuum drop, and safety valves preventing accidental release of the load.

Vacuum Lifting Frame TRIOM VZR 300 P

A typical representative of this group of grippers is the TRIOM VZR 300 P vacuum lifting frame, designed for handling sheet materials weighing up to 300 kg. The frame uses an ejector system powered by compressed air, weighs 50 kg, and reaches an operating vacuum of up to −0.6 bar.

Basic Technical Parameters of VZR 300 P

Each vacuum lifting frame is designed with respect to the specifics of the operation and the type of manipulator on which it will be mounted. The TRIOM VZR 300 P model, representing the standard category of frames, features the following parameters:

• Load capacity: 300 kg at −0.6 bar vacuum
• Vacuum source type: ejector powered by compressed air
• Air consumption: max. 270 l/min at 650 kPa
• Frame weight: 50 kg
• Load-bearing structure: steel, welded, bolted
• Suspension method: hook of a hoist or manipulator arm
• Vacuum system: closed circuit with multiple suction cups, vacuum gauge, and acoustic alarm

Each frame is equipped with quick couplings for easy connection of compressed air supply and with control valves labeled “CLAMP” and “RELEASE,” which control the gripping and releasing process.

Recommended Operating Procedure

The operation of the vacuum lifting frame is designed to be as safe and intuitive as possible.

• After hanging the frame on the hoist hook, the operator connects the compressed air supply. The suction cups must be positioned so they roughly cover the load’s center of gravity.
• The operator activates the “CLAMP” function using the valve, creating a vacuum in the suction cup system.
• The integrated acoustic signal emits sound until sufficient vacuum for handling is reached—ensuring high operational safety.
• Once the operating vacuum value is reached (at least −0,6 bar), the load is securely gripped.
• Before moving the load to the target location, the operator must first slightly lift the gripped load and check whether multiple sheets have been lifted together. If so, the excess bottom piece must be released.
• Safe handling can now begin. Handling must be done strictly in a horizontal position.
• After placing the panel at the target location, the load is safely set down, the main valve is closed, and by opening the “RELEASE” valve, the panel is detached.

The entire process is simple, fast, and reliable, minimizing the risk of damage to handled parts. It provides high working comfort for the operator and reduces physical strain.

Safety, Maintenance, Operating Principles

• Safe operation of vacuum frames strongly depends on consistent leakage checks and suction cup cleanliness. Any leaks or dirt may cause vacuum loss and reduce adhesion at the gripping point.
• Before each use, it is necessary to check:
  1. condition of hoses and connections,
  2. function of valves and indicators,
  3. cleanliness of suction cup surfaces and the handled material.
• Rough dirt, grease, or metal chips must be removed because they may damage the sealing lip of the suction cup.
• The recommended maximum permeability of the handled material is 0.5 l/min/cm² at −80 kPa.
• After completing work, the frame must be stored with the metal part resting on a support or blocks to avoid compressing the sealing lips. The frame should never rest directly on the suction cups.
• When work is interrupted and the frame remains suspended, it is advisable to keep it a few millimeters above the surface. This prevents suction cup deformation and extends their service life.

Use of Lifting Frames in TRIOM Handling Technology

The main use of vacuum lifting frames is wherever gentle, even, careful, yet stable handling of material is required without damaging the surface.

Applications of vacuum lifting frames

Vacuum lifting frames are mainly used for:
 

• handling sheets, plates, and panels weighing hundreds of kilograms,
• loading and unloading processing machines (lasers, presses, press brakes),
• moving glass panels, plastics, composite boards, and insulation panels,
• assembly and warehouse operations where safety and operator ergonomics are essential.

In combination with single-joint, double-joint, or telescopic TRIOM manipulators, vacuum lifting frames offer a flexible handling system. Thanks to their modular design, suction cup layout, arm length, and type of gripping elements can be adapted to the specific production process and handled load.