Introduction
The full name of ROV is "remotely operated vehicle". It's a kind of robot that can explore the underwater environment without the need for people to be inside. Humans usually use ROVs to explore coral reefs, discover marine life and identify threats like lionfish and marine debris. These robots are connected to ships via cables or tethers, enabling the operators on the ships to control them by using joysticks.
ROVs are equipped with multiple cameras, multi-joint arms and sensors. As a result, they can nimbly take videos and photos of the seabed or measure parameters such as temperature and pressure. Some of ByTune through-hole slip rings are designed to support these activities of them, especially the model of water-proof BTH2586FS. These slip rings are used to transfer electricity and signals among the ships and the ROVs, allowing the ROVs to move around while working.
Well, do you know how these operations are carried out? Today, ByTune will discuss with you the applications of through hole slip rings in ROVs, and how they improve the operation of ROVs.
How Do Through Hole Slip Rings Work in ROVs?
We use a set of cables or tethers to connect the ROV to the ship. When the ROV is performing underwater tasks, its rotating parts keep rotating. The conductive rings installed on this part rotate accordingly and always maintain close contact with the brushes fixed on the outer casing of the slip ring. Both are made of conductive materials. Therefore, the power of the equipment can be transmitted to the mechanical arm joints, propeller rotating shafts, camera gimbals, etc. of the ROV through this contact to drive them to start operating.
Then, the sensors collect the operation information of the ROV in real time and then transmit it from the conductive rings to the brushes and finally to the control center of the ROV or the mother ship. This helps the operators adjust the motion parameters and speed of the robot to collect samples more quickly.
Applications of Through-Hole Slip Rings in ROVs
1. Mechanical Arms
The mechanical arms of ROVs can grasp and transport marine life, such as coral samples in the deep sea, during underwater operations. For plankton, they are also equipped with small nets or adsorption tools for sample collection. The through-hole slip rings installed at the joints of the mechanical arms connect the motors and the control system. They enable the ROV mechanical arms to rotate freely at different angles at various speeds. Meanwhile, the torque and position signals detected at the joints are fed back to the control system through the slip rings. Operators can adjust the output torque and rotational speed of the motors in real time according to these signals to change the motion postures and grasping ranges of the mechanical arms.
2. Propulsion System
The propellers of ROVs are related to their navigation capabilities. Through-hole slip rings are installed between the rotating shafts of the propellers and the power and control systems to transmit electrical energy to the propeller motors. The power of common ROV propeller motors is usually between 1 and 5 kW, which can drive the propellers to rotate at a speed of 500 - 2000 rpm to generate thrust. Meanwhile, the sensors detect the equipment's rotational speed and water flow signals and feed them back through the slip rings. We can adjust the rotational speed, torque and direction of the propellers to make the ROV move in different directions.
3. Camera and Lighting System
ROVs can take or record photos and videos, especially in dark and turbid waters. They have high-resolution lenses installed on rotatable gimbals or brackets. Through-hole slip rings can transmit the power of the equipment to the lenses through cables, enabling them to take clear images of the seabed in real time and transmit the data back to the ROV main body. This allows us to adjust the brightness of the images within the lenses and their shooting angles in the light intensity range from 0 to 1000 lux.
Benefits of Using Through-Hole Slip Rings in ROVs
1. Solving the Problem of Underwater Wiring
In the traditional wiring design, the cables of ROVs are prone to getting tangled and worn during the rotation process, which may lead to short circuits. The total length of the internal cables of a small or medium-sized ROV can reach 50 - 100 m, involving various types of cables for power, signals and control. The excessive size and weight of these cables will increase the resistance of the vehicle. However, the central holes of through-hole slip rings allow the rotating shafts of the equipment and multiple cables to pass through and rotate with the components. This enables the ROV to maintain a neat and safe appearance.
2. Stable Underwater Signal Transmission
Through-hole slip rings can face this problem directly. First, they have a maximum protection level of IP68 and are completely waterproof in seawater. And, their conductive parts are made of precious metals and copper alloys, and through smooth contact surfaces and multi-shielding layer design. This allows them capable of maintaining an extremely low contact resistance of less than 0.7mω. Thus, the signal attenuation and energy loss of the remote control is reduced to a minimum.
3. Meeting Multiple Transmission Needs
The underwater sampling and shooting tasks of ROVs involve the transmission of a large number of signals. For example, there are strong electrical signals required for driving motors, as well as weak electrical signals for sensors, communication modules, controllers and so on. Through-hole slip rings adopt a concentric ring structure design, with as many as 300 conductive rings (also known as conductive paths) distributed layer by layer around the central axis. This enables them to transmit multiple independent signals simultaneously. In addition, an insulating layer is set between each ring and double shielding measures are added to reduce the interference between signals.
Options for ROV Through-Hole Slip Rings
As an experienced slip ring manufacturer, ByTune has successfully supplied slip rings to customers in over 120 countries around the world. We are good at providing rotating solutions for ROVs and various underwater applications. Our professional engineering team will custom slip rings for your projects. Here are the main options available for you:
- Through-hole Sizes: Ranging from 3 mm to 500 mm, or as specified.
- Channels: From 8 to 300 and more.
- Circuit Currents: 2A, 5A, 10A, 15A... up to a maximum of 600A.
- Operating Speeds: 300 - 5000 rpm.
- Operating Temperatures: From -40°C to +100°C.
- Protection Ratings: IP54 - IP68.
- Installation Methods: Direct installation, flange.
- Temperature: From -20°C to +100°C.
- Wires: 22AWG, 17AWG, 14AWG, UL, colored Teflon, silver-plated or tin-plated.
Conclusion
In this article, we have explored the basic knowledge of through-hole slip rings, with a focus on their applications in ROVs and the benefits they bring. Moreover, as a market leader in slip rings, ByTune has also discussed some customization options for through-hole slip rings with you. By understanding these contents, we can better choose slip rings for underwater equipment like ROVs and deal with possible transmission challenges.
Frequently Asked Questions (FAQ)
Q: How can through-hole slip rings prevent water ingress and short circuits when used in ROVs?
A: Our through-hole slip rings adopt a multi-layer sealing structure and use accessories such as rubber sealing rings or potting insulating adhesives. These sealing materials are made of materials like PTFE and are resistant to seawater corrosion. They protect the internal circuits and signal transmission under the high-pressure underwater environment.
Q: Can your through-hole slip rings transmit multiple signals simultaneously?
A: Yes, they have a channel structure and can transmit multiple different types of signals at the same time. This includes power signals, image signals, control signals and so on. Through a compact yet orderly circuit layout and the design of shielding layers (insulating materials), different channels are effectively isolated to avoid signal interference.
Q: How do through-hole slip rings stably transmit signals during long-distance underwater signal transmission?
A: Our slip rings use conductive materials such as precious metals and composite alloys as well as signal processing technologies to reduce signal attenuation during the transmission process. Meanwhile, components like signal amplifiers and filters are set inside the slip rings to enhance and optimize the transmitted signals.
Q: Will the lifespan of the slip ring be shortened when it works at high rotational speeds?
A: You don't need to worry about this. Through-hole slip rings are often structurally optimized to reduce vibration and friction during the rotation process. For example, we equip them with more precise ball bearings and a balanced structural design. In addition, the surfaces of the precious metal brushes and conductive rings are smooth and can always maintain smooth contact at high rotational speeds.
Q: How should slip rings be maintained and serviced after being used underwater?
A: After the slip rings are retrieved from underwater, they should be cleaned and inspected in a timely manner. First, rinse the surface with fresh water to wash away the seawater and debris, and then check whether there is any damage, corrosion or loose parts on the appearance of the slip rings. If problems such as severe brush wear or scratches on the surface of the conductive rings are found, they should be replaced or repaired in a timely manner.
Q: Can I get service and support if there are problems with the slip rings?
A: Of course! As a slip ring manufacturer and designer, ByTune will provide after-sales service and support for all slip rings. Under the conditions of correct installation and working, the quality is guaranteed within 6 months. This involves troubleshooting assistance and the provision of replacement parts.