With the development of society, subway travel has become one of the essential transportation modes in life, especially in large cities with large populations, there are often multiple subway lines running.
In the subway system, the track not only supports the subway vehicles, but also has the functions of power supply and signal transmission. The track itself also needs to perform various electrical tests. The research department of rail transportation in a domestic Jiaotong University focuses on the research and analysis of the characteristics of rails under the condition of low-frequency DC current . In the actual research, the customer put forward many complicated requirements for the test DC power supply. The 25m steel rail itself has a very low impedance , and the test hopes to use a current source for power supply . The specific requirements are as follows:
1. It can quickly and conveniently generate low-frequency sinusoidal waveform currents of different frequencies.
2, the interference signal can be added to the sine wave, preferably directly collected subway abnormality signal waveform reproduction problem.
For the above two points , Itech 's IT6000B / C series high-speed DC source can be easily implemented with the free upper computer software IT9000. The specific measurement is as follows :
1, is provided IT6000B / C current source priority is preferentially adjusted to the high-speed mode, the maximum current rising, falling time 1ms. C C / CV priority function can guarantee the fast test requirement of user current source.
2, I T6000B / C power supply built ARB function, select a sinusoidal signal, and peak settings, the offset frequency, the number of repetitions, to output a sinusoidal signal, found 0.1HZ, 1HZ, 10HZ, 50HZ waveform as follows:
It can be seen that IT6000 has completed the output of the sine signal better.
3, user-defined selection, .csv import file, reproducible abnormal current waveform, the waveform before the operation may be introduced into the preview. IT6000's ultra-fast response speed and waveform import function support users to complete complex waveform test requirements using only a single machine.
In addition, the IT6000 series has a master-slave parallel function that can flexibly expand the current, and the series maximum current can reach 2040A. Test requirements for high current applications IT6000 well, e.g. bidirectional 18kW power supply 10 may be separately either host control tests corresponding to the road 10 isolated DC sources, can be tested in parallel from the main diffuser 10 times, greatly improved Equipment utilization. IT6000 series and the source of two-way high-speed data acquisition function built, through panel USB port, with the U disk directly save the data, the fastest to reach us save interval level data without P C can achieve long-term data preservation, can meet diverse customer Usage needs .
Marine Electro-hydraulic Windlass
The windlass is installed on the main deck of the ship's bow, which is used for the ship to lift the anchor and drop the mooring cable.
Windlass can be divided into manual, electric, hydraulic, pneumatic, etc. according to the driving form.
The windlass can be divided into several specifications such as φ12--φ120mm according to the diameter of the anchor chain.
Windlass can be divided into single-sided and double-sided according to the distribution of drums.
The windlass is mainly composed of base, bracket, chain wheel, brake, chain wheel, gearbox, electric control system (except manual windlass), etc. Electric windlasses have electric motors, and hydraulic windlasses have hydraulic pump stations.
The main technical indicators of the windlass include the diameter of the anchor chain, the nominal speed of the anchor, the rated load, the supporting load, several levels of speed change, electrical system, etc. The installation of the windlass on the ship should ensure that the wrap angle between the anchor chain and the sprocket is 117-120°.
Electric windlass
The electric motor directly drives the windlass, and the drive shaft is driven by the gear box to work, and the structure is simple; it is generally suitable for windlasses with an anchor chain diameter of 16mm-93mm.
hydraulic windlass
It is suitable for windlass with anchor chain diameter of 16mm-120mm. Hydraulic windlasses are also called electro-hydraulic windlasses. It drives the oil pump with a motor, drives the motor with high-pressure oil, and then drives the transmission gear through a reducer (or no reducer). To make the windlass run, its structure is relatively compact and its volume is small. Now there has been an automatic hydraulic windlass, which is equipped with an anchor chain length sensor. When the anchor chain needs to be thrown out, the windlass will automatically stop; , can automatically decelerate; the anchor will automatically stop when it enters the anchor chain drum and is properly received.
Marine Electro-Hydraulic Windlass,Windlass Anchor,Electric Windlass,Manual Windlass
TAIXING HAITAI GLOBAL TRADE CO.,LTD , https://www.jiangsuhaitship.com