The function of slip ring is to solve the problem of winding. It can rotate 360° to prevent the wires from twisting and entangled. There are rotors and stators, which is to keep the power flowing when the electric motor rotates. If there is no slip ring, it can only rotate at a limited angle. With slip rings, it can rotate 360°. It plays a key role in automation equipment, so slip rings are also called joints, free current slip rings, electric hinges, etc. There are many names, and different industries have different names.
Pneumatic slip ring is pneumatic slip ring, hydraulic slip ring is hydraulic slip ring, pneumatic and hydraulic are both fluid slip rings.
The material types of optical fiber slip rings include metal armor and armor, etc. the main features are as follows:
1. The number of channels - currently the optical fiber slip ring can reach dozens of channels from 1 channel.
2. Working wavelength - visible light, infrared light. 1310, 1290, 1350, 850, 1550, the more commonly used are 1310 and 1550.
3. Optical fiber type: Optical fiber types include single film and multi-film. Single film types include 9v125, and the transmission distance of single film is generally 20 kilometers. Multi-film types include 50v125 62.5v125, and the transmission distance of multi-film is generally 1 kilometer. (9v125: 9: optical center light diameter, v: v meters, 125: refractor outer diameter) The transmission loss of single film is 1 km = 1dB loss, and the transmission loss of multi-film is equivalent to 1 km = 10/20dB. Single film optical fiber is generally used.
4. Connector type: There are many types of connectors, such as FC, SC, ST and LC. The FC category is divided into PC, APC and LPC. The PC interface is commonly used, and APC and LPC are only used in special cases of return loss. PC is a conventional cross-section connection with flat contact. APC and LPC are both chamfered contacts. The size of the LPC chamfer is different. FC is a threaded connector made of metal. ST is a snap-on connector made of metal. SC and LC are both plastic straight plugs. SC has a large plastic head and LC has a small plastic head. Optical fiber is mainly used in communication equipment.
5. Rotation speed, working environment, temperature and humidity.
Optical fiber belongs to local data transmission.
RF rotary joint usually refer to frequencies above 300 MHz. rotary joint belong to long-distance data transmission. RF rotary joint and optical fibers cannot be used at the same time. RF rotary joints and electric slip rings can be used at the same time.
RF rotary joint are divided into coaxial joints and waveguide joints. coaxial joints are contact transmission with a wide frequency range, which can reach DC-50G, generally DC-5G, and at least DC-3G. waveguide joints are non-contact transmission, with a passband (generation pass rate), generally 1.4-1.6, 2.3-2.5. you also need to understand the number of channels, frequency range, speed, working environment, temperature and humidity. Salt spray, etc. At present, the most widely used applications are single-channel and dual-channel, and occasionally 3-channel and 4-channel. Even 5-channel. The price of 3-channel, 4-channel and 5-channel is relatively high.
1.Working Voltage -Each slip ring has a rated working voltage in each loop in use, but the rated voltage of the slip ring is mainly limited by the size of the insulation material and the space. Exceeding the rated design product voltage may lead to poor insulation, internal breakdown, and even burnout.
2.Rated Current-The core components of the slip ring are the ring and the brush contact material. The contact area and conductivity determine the maximum current that the conductive slip ring can carry. If the rated working current is exceeded, the temperature at the contact point will rise sharply, causing the air at the contact point to expand and cause the contact point to separate and gasify. In mild cases, the contact will be intermittent, and in severe cases, the conductive slip ring will be completely damaged and fail.
3.Insulation resistance-The conduction resistance between any one ring of a multi-loop conductive slip ring and other rings and the outer shell. Low insulation resistance will cause interference, bit errors, crosstalk, etc. during the transmission of control signals, and sparks and temperature rise will occur under high voltage.
4.Insulation strength - the ability of the insulating components and insulating materials in the slip ring to withstand voltage. Generally, for insulators, the better the insulation performance, the stronger the voltage resistance.
5.Contact resistance - an indicator that describes the contact reliability of the conductive slip ring. The size of the contact resistance depends on the contact friction pair, material type, contact pressure, contact surface finish, etc.
6.Dynamic contact resistance - the fluctuation range of the resistance between the rotor and the stator in one path of the conductive slip ring when the conductive slip ring is in working condition.
7.Life of the slip ring -The time from the start of the slip ring to the failure of any loop of the slip ring.
8.Rated speed - affected by many factors, including contact friction pair type, structural rationality, processing and manufacturing accuracy, assembly accuracy, etc.
9.Protection performance - Depending on the actual use environment of the customer, there will be requirements for waterproof, explosion-proof, high altitude low pressure, etc. Our product protection level can reach up to IP68, and there are also explosion-proof slip rings. Currently, we are the only conductive slip ring manufacturer in China that has obtained the explosion-proof certificate.
Analog signal: Our products can pass low-frequency analog signals, sine waves with frequencies less than 20MHz/s, and square waves with frequencies less than 10MHz/s. After special processing, it can reach up to 300MHz/s. Crosstalk is the coupling degree of the signal, in dB. The higher the signal-to-noise ratio of the device, the less noise it produces. A crosstalk of 20dB is equivalent to a signal-to-noise ratio of 1%, 40dB is equivalent to a signal-to-noise ratio of one thousandth, and 60dB is equivalent to a signal-to-noise ratio of one ten-thousandth.
Digital signal: It is a type of square wave. Our products can pass digital signals with a bit rate of 100M. Packet loss rate: The packet loss rate of data packets is 5 parts per million, 5PPM. Real-time communication is serial communication, SDI, basically no delay, 20MHz/s. Delay communication is full-duplex interrogation communication, parallel communication, with delay, 100M bit rate.
The characteristic impedance of 75 ohms is analog video, including PAL and broadcasting systems. The characteristic impedance of 50 ohms is the digital video system LVDS, which is a low-level high-speed differential, and twisted pair can also be realized. Coaxial is used within 20MHz, and joints are used above 200MHz.
Active signal: a signal generated by a power supply, with strong anti-interference, such as a switching signal
Passive signal: weak anti-interference, passively generated signal. Such as K-type and T-type thermocouples, high temperature resistance <800 degrees, belong to voltage signals, are sensitive to voltage, and the wiring method is provided by the other party with compensation cables or terminals. Platinum resistance is a low-temperature resistance, <200 degrees, and has high requirements for dynamic resistance.
Optical transmission is realized by transmission medium, reflective medium and light source. 9/125 is single mode, with long transmission distance, small attenuation and high price. 50/125 62.5/125 is multi-mode, with short transmission distance, large attenuation and low price. Each channel of light can theoretically transmit multiple signals or power, depending on the modulation and demodulation capabilities of the surrounding equipment. One channel of light transmission can achieve one receive and one send. Power transmission <10 watts.
Camera link is developed from Channel link technology. On the basis of Channel link technology, some transmission control signals are added and some related transmission standards are defined. Any product with the "Camera link" logo can be easily connected. The Camera link standard is customized, modified and released by the American Automation Industry Association AIA. The Camera link interface solves the problem of high-speed transmission.
Camera Link has three configurations: Base, Medium, and Full. They are mainly used to solve the problem of data transmission volume. This provides suitable configurations and connection methods for cameras of different speeds.
Base
Base occupies 3 ports (a Channel Link chip contains 3 ports), 1 Channel Link chip, 24-bit video data. One Base uses one connection port. If two identical Base interfaces are used, it becomes a dual Base interface.
Maximum transmission speed: 2.0Gb/S @ 85MHZ
Medium
Medium = 1 Base +1 Channel Link basic unit
Maximum transmission speed: 4.8Gb/S @ 85MHZ
Full
Full = 1 Base + 2 Channel Link basic unit
Maximum transmission speed: 5.4Gb/S @ 85MHZ
Everyone, you can arrange the simple height size by yourself according to the following method, record it,
1A~3A copper ring 1.2~1.5mm, (when the size requirement is high, you can arrange it according to 1.2 rows, when the size requirement is not high, you can arrange it according to 1.5 rows, and when the inner diameter is above 80, you can arrange it according to 1.5 rows)
5A, copper ring size 1.5mm
10A: copper ring 2mm
20A: copper ring 2.5mm
Spacer 1~1.2mm, add 1mm for every 1000v increase in voltage
Number of spacers: add one more spacer per ring
Standard withstand voltage: voltage x2+1000v
Insulation resistance: 5MΩ or more at 220v (normally 500MΩ)
Current: Traditional three-phase motor I=2P, generally use 70% of rated power
Line speed: Normally 8-10m/s, special treatment can reach 15m/s
Processing of waterproof products and characteristics of structural materials:
FF-level waterproof products can adapt to outdoor rain environment, the structural material is carbon steel or stainless steel with surface hardening treatment, the life is related to the speed, customers can replace the sealing material (skeleton oil seal) by themselves
F-level waterproof products can only adapt to short-term splashing, the material is aluminum alloy, the material is relatively soft.
The plastic products currently used in the company's products are tetrafluoroethylene and PPS. Tetrafluoroethylene has rod materials, which can be machined, but it is greatly affected by temperature and is easy to deform. PPS has small deformation and good rigidity. It is a good material for injection molding, but there is no rod material.
Low Voltage Differential Signaling, a signal transmission mode proposed by National Semiconductor in 1994, is a level standard. The LVDS interface, also known as the RS-644 bus interface, is a data transmission and interface technology that only appeared in the 1990s. LVDS is a low voltage differential signal. The core of this technology is to use extremely low voltage swing to transmit data at high speed differentially. It can achieve point-to-point or point-to-multipoint connection. It has the characteristics of low power consumption, low bit error rate, low crosstalk and low radiation. Its transmission medium can be copper PCB connection or balanced cable. LVDS has been more and more widely used in systems with high requirements for signal integrity, low jitter and common mode characteristics.
Usually, data is represented in binary, +5V is equivalent to logic "1", 0V is equivalent to logic "0", which is called TTL (Transistor-Transistor Logic Level) signal system, which is the standard technology for communication between various parts of the device controlled by the computer processor.
Camera link is a high-definition transmission mode. It is developed from Channel link technology. Some transmission control signals are added on the basis of Channel link technology, and some related transmission standards are defined. Interface configuration: Camera Link interface has three configurations: Base, Medium, and Full. It mainly solves the problem of data transmission volume, which provides suitable configuration and connection methods for cameras of different speeds.
SDI (serial digital interface) is a "digital component serial interface". HD-SDI is a high-definition digital component serial interface. HD-SDI is a real-time, uncompressed, high-definition broadcast-grade camera. It is based on the SMPTE (Society of Motion Picture and Television Engineers) serial link standard and transmits uncompressed digital video through a 75-ohm coaxial cable. SDI interfaces can be simply divided into SD-SDI (270Mbps, SMPTE259M), HD-SDI (1.485Gbps, SMPTE292M), and 3G-SDI (2.97Gbps, SMPTE424M).
A device that converts electrical signals or data into a signal form that can be used for communication, transmission and storage. Encoders can be divided into two categories according to their working principle: incremental encoders and absolute encoders. According to their own properties, they can be divided into photoelectric encoders and magnetoelectric encoders.
A sensor installed on the servo motor to measure the magnetic pole position and the servo motor's rotation angle and speed. Based on the physical medium, servo motor encoders can be divided into photoelectric encoders and magnetoelectric encoders. In addition, the rotary transformer is also a special servo encoder.
The optoelectronic sighting platform is an intelligent perception video anti-intrusion product that integrates light, machinery, electricity, and images. It can be equipped with a variety of sensors including thermal imaging, visible light, high-definition telephoto lens, laser lighting and ranging, and can achieve 24-hour all-weather monitoring and early warning. The product has functions such as image stabilization system, intelligent tracking, positioning and ranging, and data fusion analysis. It is mainly used in national border control, key security prevention, anti-terrorism search and rescue, customs anti-smuggling and anti-drug, island ship monitoring, combat reconnaissance, forest fire prevention, airports, nuclear power plants, oil fields, museums, etc.
Remote operated vehicle or underwater robot
Radar is the transliteration of the English word Radar, which means "radio detection and ranging", that is, using radio methods to detect targets and determine their spatial positions. Therefore, radar is also called "radio positioning". Radar is an electronic device that uses electromagnetic waves to detect targets. Radar emits electromagnetic waves to illuminate the target and receives its echo, thereby obtaining information such as the distance from the target to the electromagnetic wave emission point, the rate of change of distance (radial velocity), azimuth, and altitude.
Radar includes: early warning radar, search and warning radar, radio height-finding radar, weather radar, air traffic control radar, guidance radar, gun aiming radar, battlefield surveillance radar, airborne interception radar, navigation radar, and collision avoidance and friend-or-foe identification radar