Rexroth linear block

Types of Rexroth Linear Blocks

Rexroth linear blocks are machine parts used in the linear guide system to support moving components. They work with guide rails to form an element that can move in a fixed direction. One of the benefits of linear blocks is that they can accommodate different mounting configurations like flanged mount, square mount, or foot mount. Additionally, they can have an open design where Rexroth linear blocks have no lids or an enclosed design with lids on both sides for more protection.

• Guide Blocks: These are sliding components that move along the rails. Guide blocks provide support to the moving part. At the same time, they ensure that movement occurs smoothly and accurately. A good example of a guide block is the Rexroth linear block with both sides closed.
• Support Blocks: Support blocks are stationary components. They provide support for the guide system by immobilizing themselves. Support blocks are usually positioned at the end of the linear guide rail. Through their immobilization, they allow the moving part to have more stability, especially when requiring more accuracy during operation.
• Ball Screw Blocks: Ball screw blocks are components of a ball screw mechanism that converts rotary movement into linear movement. In simpler terms, it is a machinery part that helps to turn something circular into something straight. The mechanism involves using balls. These balls roll in grooves, offering low friction and high efficiency. Rexroth linear blocks of this kind can come in different options, such as the single ball return or double ball return.
• Floating Blocks: A floating block allows some axial movement. They are usually positioned between the fixed support blocks. The allowance of some movement helps to reduce wear and tear that results from constant friction.

Specifications of Rexroth linear blocks

The specifications of Rexroth linear blocks may vary depending on distinct model characteristics. Initially, length, as one of the fundamental dimensions, ranges from compact dimensions of around 60 millimeters to larger lengths suitable for extended travel applications. Width and height also vary with application needs. For instance, miniature linear guide rails may have a width and height of 15 millimeters, while larger ones have proportions of around 50 millimeters. Load-carrying capacities of linear blocks depend on design types, such as standard linear blocks, miniaturized ones, or high-frequency ones. Standard blocks with mass cargoe capacities move loads weighing up to 7.000 newtons. An overall static load-carrying capacity of 14.000 newtons can be reached.

Speed capabilities of Rexroth linear blocks significantly depend on various factors. For instance, the specific type and model of the linear block can result in a variety of speed capabilities. Additionally, the design and material properties of the linear block influence its speed capabilities. Generally, they can achieve speeds from a few centimeters per second to more than two meters per second.

Rexroth linear blocks comprise several parts, each with its functionality and specification. Some of the fundamental components include:

• Carriage: A carriage of a linear block generally has length, width, and height dimensions corresponding to the linear rail it is supposed to fit. For instance, with a standard KRM linear guide rail (4000 load capacity), the carriage dimensions could be – 60 x 70 x 60 mm. The load-carrying capacity also varies. For example, for the same standard model, the load-carrying capacity could be around 7,000 newtons.
• Rail: Similar to a carriage, a linear rail has pace and width dimensions that go with it. With more extended rails, greater working lengths can be achieved. The load-carrying capacities of the linear rails also differ according to their types. As a result, they can bear static loads of 14,000 newtons and higher speeds with acceleration up to 3g.
• End stops: They are used to prevent the carriage from sliding off the rail at either end. Depending on the linear block’s type and application, different models and specifications are available.

For distinct types and applications of Rexroth linear blocks, other specifications might be present. They can be fitted with various motors and drive systems, including servo motors, stepper motors, and belt drives, according to special custom needs.

In addition to the above, maintenance is a critical procedure for Rexroth linear blocks. Some maintenance tips include:

• It is suggested to examine the linear system regularly. At least once a month for moderate loads, weekly for light loads, quarterly for high loads, and yearly for sealed systems. Check for any wear circumstances, damages, misalignments, or other abnormal phenomena.
• Clean internal and external contaminants and dirt carefully with linear system lubricants or detergent. For detergents, use liquid in the wash method to ensure that no contaminants or impurities are left. The washing program needs to ensure that washing liquid is not used in the lubricant's application area.
• Lubricate the system periodically. Lubrication intervals and amounts vary depending on the type of linear guide rail, operating environment, and temperature. Please choose the proper lubricant according to the application scenario to ensure smooth and stable operation.

Applications of Rexroth Linear Blocks

Linear blocks have several applications in various industries due to their precise movement capabilities. Here are some key areas where they are commonly used:

• Industry/Manufacturing (Assembly Lines)

  Linear blocks are used in assembly lines to facilitate automated processes by providing precise positioning and repeatable motion. They enable efficient machine assembly, product handling, and quality control tasks. For example, in rectilinear motion assembly, linear blocks can be combined with a belt-driven slide table to create a station that automatically sorts products by weight.

• Packaging

  Linear blocks play a crucial role in packaging machinery by enabling accurate packaging, labeling, and sealing operations. They assist in creating automated packaging processes with high-speed and precision. For instance, in X-axis labeling machines, a linear block can be paired with a stepper motor and an air piston to build a machine that automatically labels products based on the product ID.

• Medical Devices

  In the medical field, linear blocks are employed in various medical devices and equipment. They contribute to the precision, reliability, and functionality of machines used for diagnosis, treatment, and patient care. For example, in a syringe pump, a linear block can be combined with a stepper motor and a calibrated syringe to create a device that delivers precise drug dosages based on remote patient data.

• Robotics

  Linear blocks are widely used in robotics applications to enable linear motion and positioning. They are integral components in robotic arms, pick-and-place systems, and other robotic machines that require smooth and accurate movement. As an example, in a robotic arm, a linear block can be integrated with a multi-axis motion controller to create a machine that can automatically pick and place solid objects at different locations based on pre-programmed patterns.

• Automotive Industry

  In the automotive industry, linear blocks find applications in automated inspection, assembly, and quality control processes. They provide the necessary linear motion for precise positioning, component handling, and machine integration within automotive manufacturing workflows.

• Aerospace Industry

  Linear blocks are used in aerospace applications for tasks such as component assembly, equipment maintenance, and inspection. They enable accurate and repeatable linear motion required in aerospace manufacturing and testing environments.

• Education/Research

  In educational and research settings, linear blocks are utilized for experimental setups, prototyping, and educational projects. They offer a hands-on platform for learning about automation, motion control, and mechanical systems.

How to choose Rexroth linear blocks

The following major factors need to be considered when selecting the appropriate linear motion blocks for specific requirements of applications:

• Load capacity and moment

  Calculate the axial load, radial load, and moment acting on the linear motion block. Choose a linear block with sufficient load capacity and moment to ensure proper functioning and prevent premature failure.

• Guiding type

  Consider the guiding type that suits the application. For high-precision and low-friction applications, select a linear motion block, such as a linear slide block, with suitable guiding characteristics that meet specific requirements.

• Environmental suitability

  Determine the appropriate environmental suitability of the linear rail blocks, such as dustproof, waterproof, or corrosion-resistant characteristics. Choose a linear motion block that can withstand the application's environmental conditions to ensure long-term reliability.

• Compatibility and interchangeability

  Ensure that the selected linear block is compatible with existing systems and equipment. Consider interchangeability for ease of maintenance and potential future system expansions.

• Cost-effectiveness

  Evaluate the trade-off between performance, quality, and cost. Consider the long-term benefits and lifecycle costs of the linear motion blocks to choose a cost-effective solution that meets the application's needs without overspending.

Q&A

Q1: What is a function of the Rexroth linear block?

A1: Rexroth linear blocks guide rails and moving pieces, such as carriages or sliders, provide support and a predefined path for linear motion. They allow the connected elements to move smoothly and in a straight line.

Q2: What is the material of the Rexroth linear block?

A2: The housing of a linear bearing is often made from high-strength aluminum or lightweight zinc alloy material to ensure long service life. The choice of materials for the housing is critical in determining the linear bearing's strength, durability, and load-carrying capacity.

Q3: What are the characteristics of Rexroth linear blocks?

A3: Some characteristics include: strong bearing capacity, smooth movement, high precision, easy installation, diverse matching, low noise, high speed, and self-lubricating.

Q4: How to install a Rexroth linear motion block?

A4: Clean the mounting surface. Apply sealant to the mounting surface. Position the block and align the holes. Insert the bolts and tighten them. Connect the actuator and check the motion.