Suction Cup Bellows: Bellows Diameter 15-100 mm

Q: What is the main function of suction cup bellows?

The primary functions are maintaining vacuum seal during vertical movement, compensating for surface irregularities, dampening vibrations, and protecting the suction cup from mechanical damage.

Q: How do I select the right bellows material?

Consider application environment: PU for general use, silicone for food-grade applications, NBR for oil resistance, and specialty elastomers for extreme temperatures or chemical exposure.

Q: What causes bellows failure?

Common failure causes include material fatigue from excessive cycling, chemical degradation, temperature extremes beyond specification, mechanical abrasion, and improper installation causing stress concentrations.

Component Specifications

Definition

A flexible, accordion-style bellows component specifically designed for suction cup assemblies in automated gripping systems. It creates an airtight seal between the suction cup and mounting hardware while allowing axial movement, compensating for surface irregularities, and dampening vibrations during material handling operations. The bellows expands and contracts to maintain consistent vacuum pressure during vertical stroke movements.

Working Principle

The bellows functions as a flexible vacuum chamber extension that maintains airtight integrity while accommodating mechanical movement. When the suction cup contacts a surface, the bellows compresses to ensure proper sealing. During lifting, it expands to maintain vacuum pressure while allowing for stroke compensation. The accordion design provides both flexibility for movement and structural stability to prevent collapse under vacuum pressure.

Materials

Typically made from polyurethane (PU), thermoplastic polyurethane (TPU), silicone rubber, or nitrile rubber (NBR). Food-grade applications use FDA-compliant silicone or PU. High-temperature applications may use fluorosilicone or specialty elastomers. Material hardness typically ranges from 50-80 Shore A for optimal flexibility and durability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Stroke Length	5-50 mm
Lifetime Cycles	>1 million cycles
Mounting Thread	M5 to M16 standard
Vacuum Pressure	Up to -0.9 bar
Bellows Diameter	15-100 mm
Compression Force	10-100 N
Operating Temperature	-20°C to +80°C (standard), up to +150°C (specialty)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 21287, DIN 32561, VDMA 24962

Parent Products

This component is used in the following industrial products

Suction Cup / Gripper

A mechanical component used for grasping, holding, or manipulating objects through suction or mechanical gripping action.

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Engineering Analysis

Risks & Mitigation

Material fatigue from excessive cycling
Chemical degradation from incompatible substances
Temperature-induced hardening or softening
Vacuum leakage due to seal failure
Mechanical damage from sharp edges

FMEA Triads

Trigger: Material fatigue from high cycle frequency
Failure: Cracks develop in bellows folds leading to vacuum loss
Mitigation: Implement preventive maintenance schedules, use higher-grade materials, and monitor cycle counts

Trigger: Chemical exposure incompatible with bellows material
Failure: Material degradation and loss of elasticity
Mitigation: Conduct chemical compatibility testing and select appropriate material grade

Trigger: Excessive stroke beyond design limits
Failure: Bellows overextension causing permanent deformation
Mitigation: Install stroke limiters and implement position monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5 mm on critical dimensions, vacuum leak rate <0.1 mbar·l/s at -0.8 bar

Test Method

Vacuum leak testing per ISO 21287, compression cycle testing, material compatibility testing, temperature cycling tests

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Suction Cup Bellows

Manufacturer profiles associated with Suction Cup Bellows.

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Frequently Asked Questions

What is the main function of suction cup bellows?