Q & A on the installation of the hottest coding ca

Q & A on the installation of coded cable displacement sensor

1: characteristics of coded cable displacement sensor

(1) non contact working mode: if the pressure of coded cable displacement sensor is too fast and too high, micro expansion will occur. The information is transmitted through electromagnetic coupling between the antenna box installed in the mobile station and the coded cable laid beside the track of mobile equipment. The gap between the antenna box and the coding cable from 30mm to 300mm can work normally without mechanical contact wear

(2) absolute position detection: because the coded cable cores are arranged in gray code mode, ensuring that there is no overlapping intersection point in the whole process of the coded cable cores, it can continuously and accurately detect the absolute address within the walking range of the mobile locomotive, and the detection accuracy is up to 5 mm, which can fully meet the needs of the precise positioning of the mobile locomotive

(3) strong anti-interference ability: because the coding cable uses a unique cross twisted structure and phase detection technology, it can eliminate the electromagnetic interference generated during the power on and off process, and is not affected by environmental noise and received signal level fluctuations, and can work reliably in harsh environmental conditions such as iron ore fields for a long time

(4) suitable for harsh industrial environment: the coding cables, antenna boxes, start and end boxes, terminal boxes and inter section boxes installed outdoors are made of non-metallic materials, and the team believes that their 3D printing structure can make any industry relying on super lightweight conductive materials more effective. With the sealing process, it is not afraid of rain, dust, acid and alkali corrosion

coded cable displacement sensors are widely used in the following aspects

(1) coke oven four car interlocking control system

(2) the multi-point positioning control system of ore conveying hopper car can also be used for multi-point positioning and automatic positioning of belt transfer station, belt Gallery, coal distribution tray, sintering plant ring cooling and other trolley systems

(3) the stacker reclaimer cluster monitoring system can also be used for the automatic running, automatic positioning, Lane dropping, anti-collision, centralized monitoring and control of gantry cranes, bridge cranes, ship unloaders, yard bridges, crown block, cranes and other rail locomotives

(4) automated warehousing system

(5) positioning control system of light rail and Metro locomotives

2: application of coded cable displacement sensing technology

at present, there are about 1600 sets of coded cable displacement sensing systems in operation at home and abroad, which are classified according to the application object:

stacker reclaimer 60%

loading and unloading truck 9.2%

coke oven locomotive control 26%

other 3.8%

classification by industry:

91% in the steel industry

nuclear energy: 1.9%

electric power 2.3%

transportation 1.7%

others 4.1%

3: coding cable principle

the encoded cable displacement sensor communicates with the electromagnetic coupling between the flat encoded cable close to each other and the antenna box, and detects the position of the antenna box in the length direction of the encoded cable at the same time of communication

coding cable is composed of cable core, mold core and cable sheath. There are two kinds of cable cores, namely, reference line (r line) and address line (G0 line -g9 line). The reference line is used to obtain standard signals and the address line is used to detect addresses. Each pair of address lines is arranged according to the law of different steps, and they cross every certain length (step). Set the minimum step of coding cable as W, then the steps of G0, G1, G2... G8, G9 are 1W, 2W, 4W, 8W... 256w, 512w respectively, and the reference line r does not cross in the whole electrical coding cable section

using the induction principle of the simplest single turn coil, when alternating current is connected to the coil of the antenna box of the mobile station, an alternating magnetic field will be generated near the antenna box. Because the antenna box is very close to the coding cable (about 80mm),  Therefore, the coding cable is approximately in an alternating and evenly distributed magnetic field, so each pair of coding cable cores will generate induced electromotive force

the address line and the reference line are 0 in phase and 1 in phase The information sensed in this way is gray code arrangement and will never be repeated

4: is it possible to install the mobile antenna box on the locomotive and transmit the code sensed from the coding cable to the master station through radio waves. The master station obtains the absolute position value of the locomotive after conversion, and then controls the advance and retreat of the locomotive

the encoded cable displacement sensor has two working modes:

the first is the ground detection mode. The address coding transmitter and antenna box are installed in the mobile station, the address signal is transmitted through the antenna box, and the address coding receiver is installed on the fixed station. The address detection is completed in the fixed station, which promotes the continuous emergence and testing of new products. If the mobile station wants to get the location of the station, it can get it from the fixed station through wireless communication

the second method is on-board detection. The address coding transmitter is installed in the fixed station, and the address signal is transmitted through the coding cable core. The antenna box and address coding receiver are installed on the mobile station, and the mobile station directly detects the address. If the fixed station wants to get the location of the mobile station, it can be solved by wireless communication

which address detection mode should be selected depends on the needs of the control system. If the center of gravity of the control system is on the mobile station, the on-board detection method is better; If the center of gravity of the control system is at the fixed station, the ground detection method is more appropriate

5: coding cable three car positioning technology feels good, and the price is not high But I don't know the effect after use? If you have experience, give some suggestions, such as the overall effect after use, where is the general failure point, and the selection of devices

3. Furnace size: Φ one hundred and ten × 350mm common fault 1: unable to detect the locomotive address or address detection deviation:

1) check the address card status code, FF indicates that the address card is faulty, AA indicates that the address card is normal

2) check whether the antenna box is knocked off, and whether the cable connected to the antenna box is hung up

3) unplug the input cable of the matching amplification unit, measure the resistance value of R line, l line and each g-pair line with a multimeter, and check whether the R, l, g-pair lines are short circuited Open circuit

4) check whether the cable is sintered due to red coke, abnormal connection of interstage box or start box

common faults 2: abnormal communication:

1) whether the communication cable connector has poor contact due to vibration

2) whether the communication components (such as digital radio) work abnormally and crash due to poor environment

3) whether it is a rainy day Accompanied by lightning

4) is there a wireless signal source with the same frequency around

6: the coded cable three car positioning technology has been upgraded through several generations, but the previous products soon died. I don't know how this generation is

product performance upgrade

1), upper computer

in the first generation system, there are two upper computers. One actuator