Tension Gas Springs & Struts , Usage Fields, Control Units
Introduction Pullstrut Series
A pull-type reverse action gas strut is a specific type of gas spring that operates in the opposite manner compared to a standard gas spring. While a standard gas spring extends when compressed and retracts when released, a pull-type reverse action gas strut extends when released and retracts when compressed. This type of gas strut is commonly used in applications where the primary force is in the pulling direction.
How Does Gas Spring Work?
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Retraction Phase (Pulling Action): When the external force pulling on the piston rod is released, the potential energy stored in the compressed gas causes the piston to move away from the rod end. This extension of the piston rod occurs as the gas inside the cylinder expands, pushing the piston away from the valve end. The one-way valve allows the gas to flow from the rod chamber to the gas chamber during this extension phase.
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Compression of Gas: As the piston rod extends, the gas inside the gas chamber gets compressed, storing potential energy in the gas strut.
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Extension Phase (Reverse Action): When a force is applied to compress the gas strut (pulling on the piston rod), the gas inside the gas chamber is compressed further. This increased pressure causes the piston to move toward the rod end, causing the piston rod to retract. The one-way valve prevents gas from flowing back to the rod chamber during this compression phase, allowing the gas strut to control the retraction speed and provide cushioning.
QBQ Black Hardened Carbon Seel
Rod Connector Thread
Sealing Package
Piston Package
ST14 Steel Tube
Tube Connector Thread
Internal Tube
How to Measure Traction Gas Spring
In case of custom design or ordering replacement gas springs there are some important parameters that needed to be provided. These parameters are;
– Compressed Length (CL) ; it needs to be measure as gas spring fully compressed or closed. If there is not end fitting on gas spring please measure excluding threads. If there are end fitting ong gas spring please measure from center to center.
– Stroke Length (s) ; it is actually difference between fully extended and fully compressed length.
– Pressure Rate (F1) ; which can be considered as lifting power of gas spring. Each diameter range provides certain power capacity. F1 value can be stated as Newton (N) or Pound (Ibs).
Dimension Parameters of Pullstrut gas springs are being measured by universal tools which calibrated periodically according to DIN 865/866 considering item drawing. Tolerance rate is ± 2 mm in accordance with TS 1980-2 EN 22768-2.
Endurance, Lifetime
Pullstrut Series Gas springs are designed in such a way that they can reach some 100,000 cycles via the whole stroke without problem. Which means without force loss, oil leakage. Besides, corrosion resistance is main expectation from gas springs. We provide our Pullstrut Series gas springs with above 120 hours salt duration.
Salt Spray Tests being occured by officially registred laboratories according to TS EN ISO 9227 Corrosion tests in artificial atmospheres – Salt spray tests. 100 hours is acceptance criteria.
This standard describes the spraying of a salt solution in the chamber at 35°C or 50°C. Acetic acid or copper chloride can be added to the NaCl solution to accelerate the reaction. The fine salt fog condenses on the test samples and initiates corrosion. A salt spray chamber according to DIN EN ISO 9227 is supplied with a minimum volume of 400 litres.
Pressure Parameters and Tolerances
Pullstrut Series gas spring is a closed system consisting of 2 pressure tubes and piston rod with piston, as well as compressed Nitrogen (N2) as an energy source and a lubrication oil. Pressure rate of gas spring generally defined as F1 with unit of N (Newton).
In order to get most certain results, test environment should be 20 C° (±3°). Positioning in test equipment as rod side down. There are 2 main measurement methods for measuring pressure rates of gas springs.
- Dynamic Measurement
From the fully extended position,the gas spring is compressed at a con-stant test velocity until fully compressed. The subsequent, automatic extension is controlled at the same constant velocity. During com-pression/extension, the force reaction is recorded, resulting in the cha-racteristic curve. F3 measured in after 5mm compressed of rod. F4 measured 5mm before fully compressed position.F2 measured 5mm extension after fully compressed. F1 measured 5mm before fully extended position.
- Static Measurement
Similar to the dynamic measurement, the static measurement is performed with a constant speed. However, the motion is interrupted at the measuring points and the spring force is measured in a static condition. F3 measured in after 5mm compressed of rod. F4 measured 5mm before fully compressed position.F2 measured 5mm extension after fully compressed. F1 measured 5mm before fully extended position. Dynamic measurement is being applied to force measure, unless otherwise specified. F1 rate is being compared to referance drawing.
Pullstrut Series Usage Fields - Applications
Traction type gas struts, also known as pull-type gas struts, have a specific design that allows them to provide controlled pulling or tension force when extended. Here are some usage fields and applications where traction gas struts are commonly employed:
- Medical Equipment: Traction gas struts are applied in medical equipment like examination tables, dental chairs, and imaging systems, allowing precise positioning and angle adjustments for medical professionals and patients.
- Aerospace and Aviation: These gas struts find use in aircraft interiors for tasks like opening and holding overhead compartments, providing efficient storage access during flights.
- Industrial Equipment: These gas struts are integrated into industrial machinery to facilitate controlled pulling of access panels, safety guards, and equipment components during maintenance and operation.
- Retail Displays: Traction gas struts are used in retail displays and signage to adjust the height and angle of promotional materials, enhancing visual merchandising.
- Automation and Robotics: Traction gas struts are employed in automation and robotics for tasks such as lifting access covers, aiding in joint movements, and controlling motion in robotic arms.
- Equipment Enclosures: These gas struts are integrated into enclosures for electrical equipment, generators, and machinery, providing easy and safe access for maintenance and inspections.
- Sports and Fitness Equipment: Traction gas struts assist in controlled adjustments of components in fitness machines, gym equipment, and sports gear.
Traction type gas struts offer precise and reliable tension force in various applications, enhancing functionality, safety, and user convenience across a diverse range of industries.
Pullstrut Series Catalogue
Brackets Catalogue
End Fittings Catalogue
