Letters, working principles and installation methods for magnetic switches in air tanks
Activation of the magnetic switch on the cylinder
The magnetic switch for the cylinders is to place the magnetic switch on the outside of the cylinders. The cylinders allow for various types of cylinders, but the cylinders must be less magnetic and highly magnetic, such as hard aluminium, stainless steel, brass, etc. A magnetic ring of a permanent magnet (a rubber magnet or a plastic magnet) is installed on a non-magnetic piston. When the piston moves close to the switch, the two reeds of the reed switch are magnetized and attracted to each other and their contact points are closed; when the reeds are removed, the reeds are demagneted and the contact points are broken. When a point is closed or disconnected, a telecommunications signal is sent (or the telecommunications signal disappears) to control the corresponding electromagnetic valve to complete the switch. As shown in the figure below. Magnetic switches generally also have switch-activated lamps and voltage protection circuits that are wrapped in a shell with resin。
Magnetic switch characteristics of cylinders
Magnetic switch cylinders are used to detect the location of the cylinder process, are not required to set control valves (or process switches) and their fittings at either end of the journey, and are not required to set impact blocks at the end of the piston, so they are user-friendly and structurally compact. High reliability, long life expectancy, low cost, high switch response time and therefore widespread application。
Method of installation of magnetic switches for cylinders
1) stabilized with steel belts
2) fixed on the guide
Three, the calculus is on the pole
4) direct installation
Location of installation of magnetic switches for cylinders
Magnetic switches can be installed at the end of the process or at any position in the middle of the process。
For the case where the magnetic switch is to be installed in the middle of the process (e. G. To stop the piston at a location in the middle of the journey), the location of the installation of the switch may be determined as follows. In the position where the piston shall be stopped, the piston shall be fixed, and the magnetic switch shall be moved to the right or left of the piston, and the location where the suction begins is identified, the central position of the right or right suction is the highest sensitivity of the switch. Magnetic switches should be fixed at this maximum sensitivity position。
When the switch is to be installed at the end of the process, the distance a and b from the side cover and the poleless side cover have been marked for different cylinders to ensure that the switch is installed at maximum sensitivity。
Attention to the use of magnetic switches in cylinders
1) for safety reasons, the spacing of the two magnetic switches shall be 3 mm greater than the maximum magnetic demurrage。
2) magnetic switches shall not be attached to powerful magnetic field equipment (e. G., welding equipment)。
3) when the magnetic switches of the two upper cylinders are used in parallel, the distance between the two cylinders shall normally be greater than 40 mm in order to prevent interference with the movement of magnetic bodies and to influence the accuracy of the detection。
4) the speed of the piston close to the magnetic switch shall not exceed the maximum speed vmax that the magnetic switch can detect. Relationship between the maximum speed vmax and the minimum action range lmin of the magnetic switch and the action time of the magnetic switch lock belt load tc: vmax=lmin/tc
For example, the action time of an electromagnetic valve connected to the magnetic switch is t = 0. 02s, the minimum action range of the magnetic switch is lmin = 10 mm, and the maximum speed of the magnetic switch can be detected vmax = 500 mm/s. This magnetic switch is available if the piston is less than 500 mm/s. If the piston is moving at a speed greater than 500 mm/s and there is no suitable universal magnetic switch to select, only the magnetic switch with a time delay is selected。
5) when a switch is installed, screw the bolts properly. The power rectangular passes the general assembly damage switch and is too small to be able to deflect the optimal installation position of the switch。
6) periodically check whether there is a deviation in the installation of magnetic switches. Double-colour switches are activated when the position piston is stopped, the green light is correct and the red light is deflected。
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