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Linear Chains: The solution when space is tight, up to 35 kN
Linear Chains enable the realization of linear movements with compressive loads over more than 10 meter (about 11 yards)* and that with minimal installation space thanks to the retractable chain.
3 reasons why GROB's linear chain is perfect for your project:
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Efficiency from 80 to 90%
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Enduring for temperatures up to 550°C (1022°F)
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Low operating costs and low maintenance
Customers from all over the world trust the Linear Chain
Do you have similar problems?
Drive product with too low duty cycle
In applications where continuous or frequent use is required, a too low duty cycle leads to inefficient operation and frequent interruptions.
Drive cannot withstand extreme temperatures
In applications where lifting movements are required in extreme temperature ranges, conventional drive systems reach their limits, as they don't function reliably at very high or low temperatures.
Limited space for the use of drive systems
In environments with very limited space, it's difficult to install conventional lifting or conveyor systems, as they take up too much room and lack flexibility.
How to solve these problems with the Linear Chain
No risk of overheating
The linear chain SK is designed for a high duty cycle, which means it doesn't overheat and is ideal for applications requiring frequent or continuous movements, without frequent interruptions or cooling periods.
Robust in heat and cold
The linear chain SK operates flawlessly even under extreme temperatures. It's designed to function reliably at both high and low temperatures, making it ideal for applications in demanding environments where other systems may fail.
Space-saving
Thanks to its ability to retract, the linear chain SK is ideal for applications in very tight spaces. It can be integrated in a space-saving manner while still offering high performance in a compact area.
Chain designed for compressive forces: Benefits of industrial chains and thrust modules intelligently combined
The Linear Chain SK transmits compressive and tensile forces from 3 kN to 35 kN. A motor drives a sprocket, which in turn drives the chain, forming the chain links into a stable unit. Shoulders on the individual chain links stiffen the chain when a compressive load is applied. When a load needs to be lowered or pulled, the chain links are compactly inserted and stored in the housing.
Our linear chains are used in numerous industries and applications, including stage platforms, warehouse logistics, cooling systems, offshore applications, charging of blast furnaces, and much more.
Unbeatable Advantages of a Linear Chain by GROB
Easy Maintenance
The maintenance of the linear chain is simpler compared to a screw jack, as worn parts or chain links can be quickly and easily replaced without the need to modify the entire system.
Stroke Length unlimited
With appropriate guide rails, the chain can be extended as needed without depending on available raw material lengths.
Low Space Requirement
The linear chain serves as a more space-saving solution compared to a screw jack, as the chain is unwound.
Resistance to Heat
Operating environments with temperatures up to 250°C (482°F) are non-critical. With a special configuration, continuous temperatures of up to 560°C (1040°F) are possible.
High Stroke Speed
Standard stroke speed up to 250 mm/s, in exceptional cases speeds of up to 1,000 mm/s are possible.
Still not quite sure?
Our figures speak for themselves.
8000
80
3700
In comparison
Comparable drives
✖ Comparable products are hardly or not found on the market, as the linear chain provides unbeatable advantages for its applications.
Linear Chain by GROB
✓ Less space required compared to similar actuators
✓ Up to 30% higher efficiency
✓ Long stroke lengths without support
✓ Low maintenance
✓ High durability
What customers say about our linear chains
Bret Hwang
General Manager
Framo Morat, Inc.
We are impressed by the GROB linear chain. Its small footprint enables flexible integration into our systems. At the same time, it offers a remarkable lifting speed, which significantly speeds up and optimizes our production processes.
Guillaume Ducret
Area Manager
Fritz Kübler Sàrl
The GROB linear chain has exceeded our expectations. Its simple maintenance has optimized our operating times, while its long-lasting performance ensures the reliability of our systems. A product that maintains its value over time.
Success Stories: How GROB's Linear Chains are transforming the industry
Linear Chain in the Automotive Industry
BMW requires a solution to an issue with wiring harnesses manufactured in Europe and used for the production of BMW Minis in Cowley, Oxfordshire. Therefore, BMW has submitted a request to develop a system that gently heats the wiring harnesses to make certain parts more flexible and easier to assemble. Click below to learn more!
Turning around 20-foot cargo containers in just 5 minutes
Every day, thousands of trucks travel our highways, transporting cargo containers. Upon reaching their destination, these containers need to be handled. Typically, this requires either a crane or a forklift—and an operator to handle these machines. This consumes time, money, and resources, making it not the most efficient option. A much more elegant solution is the space-saving marvel of the linear chain. Read more here.
More applications with linear chains can be found here:
Operating instruction
Linear Chain
FAQs about Linear Chains
What's a linear chain?
A linear chain is a type of chain that can be both pulled and pushed. When the chain links are pushed together, they stay stable and rigid, allowing you to move things forward. It’s often used in machines to lift or push objects.
What a Linear Chain is and where it is used - GROB GmbH chevron_rightAt what speed can a linear chain operate?
Depending on the size, the driving speed is usually below 50 rpm.
Can multiple linear chains be connected together simultaneously?
Yes, lifting systems with multiple chains connected together are common.
What's the difference between the Linear Chain SK and the Tower Chain TC?
The chain of the Linear Chain consists of links that rest on the shoulders and pins of the succeeding link. The chain of the Tower Chain is constructed with U-shaped chain links, providing greater stability and enabling unguided strokes of over 4m.
How fast can a linear chain move?
In standard applications, linear drives can be operated with a speed of 250mm/s. Special applications have already been implemented with speeds exceeding 800mm/s.
Are there also stainless steel versions available?
Yes, the use of stainless steel materials is a common practice for environments with aggressive media.
Can linear chains be used in the food industry?
Yes, depending on the proximity to the product, the chain can also be completely made of stainless steel.
How accurately can the linear chain position?
- When under pressure load: depending on the control, 100% repeatability can be achieved.
- Under changing loads: the control system must consider the backlash at the sprocket and manufacturing tolerances in the chain links.
What needs to be considered in the planning of linear chain systems?
- The load must always be guided
- Acceleration should be controlled via a ramp
- The chain cannot perform a swiveling movement
- The permissible buckling length must not be exceeded
Does a linear chain always need to be guided?
No, within the buckling range, linear chains can also be used without guidance.
How can one achieve synchronous operation with multiple lifting elements?
- Electronic bridge: If each lifting element of the system is driven by a motor, electronic synchronization can be achieved through encoders.
- Mechanical linkage: More cost-effective and fail-safe are cardan shafts and bevel gearboxes, which can connect all lifting elements of a system together.
What is the polygon effect in chain systems?
The polygon effect occurs when a chain is positively driven by a sprocket. In this case, the chain cannot run perfectly circularly on and off the sprocket, causing deviations in the path of the traction medium. The speed of the chain then fluctuates periodically around a mean speed, which can manifest as vibrations in the chain.
How can the polygon effect in chain systems be prevented?
Since the chain undergoes radial movement due to the polygon effect, the guide plates are extended, and minimal play is allowed. This helps mitigate this effect.
Can a linear chain also perform a swiveling movement?
No, swiveling movements are not possible with the linear chain.
What efficiency do linear chains have?
65% with chain magazine, 80% with free chain.
Do two linear chains running in opposite directions replace a guide?
No, the load MUST always be guided.
How can the buckling of a linear chain be calculated?
There is no calculation basis for this. The buckling length has been determined through tests. You can find a corresponding diagram for horizontal applications here: General Catalog 2023 (grob-antriebstechnik.de). For vertical applications, please contact us.
Can a push chain be used in a cantilevered manner - without guiding the load?
No, a linear chain can never take over the guiding itself. The load must be guided.
What accessories make sense for push chains?
- Lubrication system: attached lubrication brushes extend the lifespan.
- Chain magazine: the chain can be rolled up behind the housing.
- Reduction gear: especially useful in lifting systems to reduce torque through gears.
- Force sensor: for measuring axial load and protection against overload.
What connection options are available for linear chains?
We always recommend using our standard link to connect your load. Utilize all the holes to ensure proper loading of the chain. Dimensions for the front link can be found here: General Catalog
Are there versions of linear chains with increased corrosion protection?
As standard, GROB chains are galvanized. For environments with aggressive media, stainless steel chains can be used.
What temperatures can linear chains withstand?
- Standard: 180°C
- High-temperature continuous: 550°C
- High-temperature short-term (under 2 minutes): 1050°C
What needs to be considered in the dimensioning of linear chains?
- The load must be guided
- The push chain size must be chosen correctly
- It should be driven over a ramp
Can the chain's lifespan be extended?
Yes, hardened chain links achieve a lifespan four times longer.
What's the difference between a chain magazine and a chain cover?
- A chain magazine winds the chain in multiple circular paths. Advantage: greater space saving.
- A chain cover protects the chain attached to the housing. Due to the attachment, the chain aligns itself and thus halves the stroke length. Advantage: more cost-effective.
Can the chain also be stored in a guide rail?
Yes, the chain can be stored perpendicular to the lifting movement, such as 90°, or even 180° (parallel) to the lifting movement, as in the case of tool tables. The lift then operates on the table, while the storage runs parallel underneath it.
What is the T-guide rail used for?
The T-guide was developed when space for the standard rail above the sliding surface was lacking. In one application example, the customer needed to maneuver with a forklift. The T-guide rail was then embedded in the floor, allowing the vehicles to continue maneuvering undisturbed.
Does a linear chain have self-locking capability?
No, you should provide a brake on the motor.
What should I consider regarding the installation positions for linear chains?
The different installation positions do not affect the usability of linear chains (e.g., through oil sight glasses or similar). By simply changing the mounting side of the mounting brackets, the mounting sides can be adjusted as needed.
How long is the expected lifespan of linear chains?
Here is no calculation basis for this. Tests have shown that for standard chains, 250,000 cycles, and for hardened chains, 1,000,000 cycles represent realistic values.
You can find us here
GROB Antriebstechnik GmbH
Eberhard-Layher-Straße 5-7
74889 Sinsheim-Steinsfurt
Eberhard-Layher-Straße 5-7
74889 Sinsheim-Steinsfurt
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Philipp Schmalzhaf, Sales Manager