JWJXC-440 Promise Reinforced Relay
| JWJXC-440 Promise Reinforced Relay |
First, the signal relay overview
JWXC-1000.JWXC-1700.JWXC-7. The stepless relay signal relay is a general term for various types of relays used in railway signals, and is an indispensable important device for various signal control systems.
(1) Requirements for railway signals to relays
As the main (or important) device in the railway signal system, the signal relay is safe and reliable in operation, which is the necessary condition for ensuring the normal use of various signal devices. To this end, the railway signal imposes extremely stringent requirements on the relay, as follows:
(l) The action must be reliable and accurate;
(2) Long service life;
(3) has sufficient ability to close and open the circuit;
(4) It has stable electrical characteristics and time characteristics;
(5) High electrical insulation strength can be maintained in the case where the temperature and humidity of the surrounding medium vary greatly.
For specific requirements, see "Signal Maintenance Rules Technical Standards" 11 Relay 11. 1 General.
According to the reliability of the work, the signal relay can be divided into three levels:
First-stage relay: It is absolutely not allowed to weld between the front contact and the movable contact; the disconnection of the armature drop and the front contact is guaranteed by the weight of the armature and the movable part; when any set of front contacts is closed, all the rear contacts must be All disconnected, and vice versa; when the armature is in the falling position, it should work stably. The back contact pressure is mainly generated by gravity; there is a higher return coefficient: the track relay is not less than 50%, and the general relay is not less than 30%.
Secondary relay: The armature is returned by its own weight or the contact spring force; the return factor is not less than 20%; when any set of front contacts is closed, all rear contacts must be disconnected, and vice versa.
Three-level relay (electric code type and telephone type): the pressure of the armature return and the rear contact point are generated by the reaction force of the moving contact spring piece; the front and rear contacts have the possibility of welding.
In the execution circuit of the signal device, if the relay cannot be disconnected from the front contact due to abnormal operation, it will seriously threaten the safety of the driving, so the design uses the primary relay and the high reliability of the primary relay. Therefore, the circuit method is not considered in the circuit to check the drop state of the relay armature. Therefore, when repairing the primary relay, it is required to pay special attention to its reliability and strictly guarantee its technical conditions. The code type relays are used in the selection circuit, and the control objects are not connected, but the reliability requirements of such relays are never allowed to be reduced, because they work well and affect the normal operation of the signal equipment to ensure the safety of the train. Running is equally important.
(B), the basic principle of the relay
A relay is an electromagnetic switch. There are many types of relays, different performances, and various structural forms, but they are composed of two major parts: the electromagnetic system and the contact system. The electromagnetic system is composed of a coil, a fixed iron core and a neodymium iron and a movable armature, and the contact system is composed of a movable contact and a static contact. When a certain value of current is applied to the coil, the electromagnetic attraction force is generated by the electromagnetic action or the induction method to attract the armature, and the armature drives the contact system to change its state, thereby reflecting the state of the input current.
Electrodeless relay
The stepless relays include JWXC-2000, JWXC-1700, JWXC-1000, JWXC-7, JWXC-2.3, JWXC-370/480 and JWXC-H600, JWXC-H340, JWXC-500/H300.
(1) Structure of DC electrodeless relay JWXC-1000.JWXC-1700.JWXC-7. Stepless relay
Figure 1-3 shows the structure of the JWXC DC stepless relay. The electrodeless relay consists of two parts: the electromagnetic system and the contact system. The electromagnetic system includes a coil, a core, a neodymium iron, and an armature. As shown in Fig. 1-7, it has the characteristics of compact structure and convenient processing.
1 coil
The coil is horizontally mounted on the iron core and is divided into a front ring and a rear ring. The reason why the double coil is used is mainly to enhance the adaptability and flexibility of the control circuit, and the single coil control, the double coil series control or the circuit may be required according to the circuit. Double coils are connected in parallel.
The coil is wound around a bobbin which is pressed by a phenolic resin. The slow-release type stepless relay uses a copper damper bobbin to increase the slow release time. The coil is wound with a high-strength enameled wire, and the tap is welded with a lead piece. The connection between the coil and the power supply piece is shown in Figure 1-8.
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