SIASUN Tanlong Series Snake-Arm Robot (Tanlong Series Snake-Arm Robot)

The “snake-arm” (also called a continuum or hyper-redundant manipulator in broader robotics literature) emphasizes many degrees of freedom, long reach-to-diameter ratio, and obstacle-avoiding motion, enabling inspection, handling, or intervention tasks inside narrow passages, complex piping galleries, and equipment cavities that are difficult to reach safely by human workers or standard robots.

Public SIASUN communications describe the Tanlong snake-arm system as a super-redundant manipulator with multiple joints and specialized control modes intended for complex operations, with particular relevance to high-risk scenarios such as emergency response and industrial inspection.

Design and Features

Snake-arm mechanical concept

Snake-arm robots are characterized by serially connected segments that can bend and “thread” through constrained spaces. Compared with a typical 6-axis industrial robot, a snake-arm’s extra joints provide kinematic redundancy, which can be exploited to:

• maintain tool orientation while navigating around obstacles,

• keep the arm body away from sensitive surfaces,

• reach targets from multiple approach angles, and

• continue operation even if some joints are constrained by the environment.

Tanlong series structural features

SIASUN’s Tanlong Series Snake-Arm Robot has been described as a snake-arm manipulator with 12 joints and very high overall degrees of freedom (see “Technology and Specifications”). This configuration is aligned with use cases that demand fine path shaping and stable end-effector positioning while the arm’s body conforms to the surrounding workspace.

Control and operation features

SIASUN describes the Tanlong snake-arm system as supporting operational modes such as:

• end-following / follow-the-end control, a motion strategy where the arm segments trace a path defined by the end-effector’s trajectory (useful for navigating along a narrow corridor without collisions), and

• remote operation approaches suitable for hazardous areas.

While the precise user interface and autonomy stack can vary by deployment, snake-arm systems commonly integrate supervisory control with safety interlocks, allowing operators to switch between automated path behaviors and manual “fine adjustment” when working near sensitive equipment.

Technology and Specifications

Degrees of freedom and jointing

SIASUN’s published information describes the Tanlong snake-arm robot as having:

• 12 joints

• 24 + 1 degrees of freedom (DOF) (as reported in SIASUN materials)

In high-DOF manipulators, the additional joints provide “shape control” of the arm body, enabling the robot to avoid obstacles while keeping the tool on target. The “+1” DOF is often used to indicate an additional functional axis or system-level degree of freedom beyond the primary articulated joints (for example, a base motion or a specialized module), though the exact interpretation depends on the manufacturer’s definition.

Motion and navigation in constrained spaces

A core capability described for the Tanlong system is end-following control, which is particularly relevant in scenarios such as:

• entering a narrow opening,

• progressing through a tortuous path between components, and

• maintaining a collision-free posture as the robot advances.

Sensing and task tooling

Public-facing descriptions typically emphasize the Tanlong system’s suitability for inspection and intervention tasks, which in practice often involves modular integration of:

• visual sensors (e.g., cameras and lighting),

• distance/proximity sensing for collision avoidance, and

• end-effectors adapted to the task (grippers, probes, sampling tools, etc.).

However, SIASUN’s publicly available materials do not consistently disclose a single fixed sensor or tool configuration for the Tanlong series, and real-world deployments are commonly application-specific.

Environmental and safety design considerations

Snake-arm robots intended for hazardous environments often incorporate protective design measures (e.g., sealed joints, ruggedized cabling, and remote-operation workflows). SIASUN positions the Tanlong snake-arm robot for complex and potentially hazardous industrial contexts, though exact ratings (such as IP protection, radiation tolerance, or temperature range) are not always published in general marketing materials and may be provided via project documentation.

Applications and Use Cases

Nuclear and high-risk inspection scenarios

Snake-arm robots are frequently associated with inspection and intervention in areas where human access is difficult or unsafe. SIASUN’s Tanlong snake-arm robot is presented in the context of hazardous, complex operations, which can include nuclear-adjacent environments (e.g., tight plant spaces, maintenance galleries, and inspection corridors) where remote reach and obstacle negotiation are important.

Confined-space industrial inspection

Common industrial uses for snake-arm systems include:

• inspection behind dense equipment layouts,

• accessing interior cavities of large machinery,

• navigating pipe racks and narrow service channels, and

• positioning sensors for non-destructive testing (NDT) support tasks.

The Tanlong series’ high DOF and end-following control concept are aligned with these confined-space requirements.

Emergency response and complex intervention

In emergency response contexts, robots are often used to reduce human exposure while gathering situational data or manipulating objects. A snake-arm platform can be advantageous when responders need to reach around obstacles or work through partial openings without clearing debris first. SIASUN’s communications frame the Tanlong snake-arm robot as suited to complex operations where remote capability is beneficial.

Advantages / Benefits

Access and dexterity in constrained environments

The Tanlong snake-arm robot’s key benefit is reachability: its many joints can “wrap” and “thread” through constrained volumes, enabling tool placement where standard robot arms may be blocked.

Kinematic redundancy for obstacle avoidance

With many degrees of freedom, the system can maintain end-effector pose while adjusting the rest of the arm to avoid collisions—useful for delicate inspection tasks around cables, valves, instrumentation, and irregular structures.

Remote operation for improved safety

By enabling remote manipulation in environments that may be hazardous (radiological, chemical, structural, or otherwise), snake-arm systems can help reduce risk to personnel and support more consistent inspection workflows.

FAQ Section

What is the SIASUN Tanlong Series Snake-Arm Robot?

The SIASUN Tanlong Series Snake-Arm Robot is a highly articulated, snake-like manipulator designed to reach and operate inside confined or hazardous environments, using many joints and specialized control modes for obstacle-avoiding motion.

How does the Tanlong Series Snake-Arm Robot work?

It works by using multiple joints and high degrees of freedom to “shape” the arm body around obstacles while positioning the end-effector at a target. SIASUN describes features such as end-following control, which helps the arm advance through narrow paths by having segments trace the end-effector’s route.

Why is the Tanlong snake-arm robot important?

Snake-arm robots are important because they enable remote inspection and intervention in places that are difficult or unsafe for humans to access, reducing operational risk while improving the ability to gather data or perform tasks in complex equipment spaces.

What are the benefits of a snake-arm robot like the Tanlong series?

Key benefits include access to tight spaces, obstacle avoidance through redundancy, and remote operation for safer inspection or intervention in hazardous conditions.

Summary

The SIASUN Tanlong Series Snake-Arm Robot is a super-redundant, high-DOF manipulator engineered for confined-space access and complex, safety-critical operations. With reported 12 joints and 24 + 1 degrees of freedom, plus control concepts such as end-following motion and remote operation, the Tanlong series is positioned for inspection and intervention tasks where conventional robot arms and human workers face significant access or risk limitations.