Magnetic lock is one of the widely used locks in indoor high-voltage switchgears. It can effectively prevent the occurrence of misoperations. It has an irreplaceable role in the power generation and power supply departments. It has a very comprehensive function, which is commonly used. Mainly have automatic reset function, manual reset function, manual unlock function, locking insurance function and so on. The following small series introduces the principle of magnetic lock and the advantages and disadvantages of magnetic locks.
Magnetic lock principle
The initial design concept of the magnetic lock is from the electromagnet. The two magnets will attract each other under certain conditions. This actually satisfies the principle of attracting magnets and attracting the opposite sex. The magnetic lock is also used in this way. . It can connect the current itself, when the current passes through the silicon steel plate (an internal part of the magnetic lock), the magnetic lock will produce a strong adsorption force, so as to absorb the iron plate. This is a complete lock process. After locking, if you want to open it, you must be recognized by the access control system (general installation of a magnetic lock with an access control identification system). The identification method is to see the requirements of its design. Only in this way can you enter. Magnetic locks have an automatic alarm system if you want strong entry.
Magnetic Lock Advantages and Disadvantages
1, see the circuit board
The inferior magnetic lock can be judged from the circuit board. The inferior magnetic lock circuit board has a rough printing and a very simple layout. There is no varistor (that is, the sine wave generator, generally two) and only one set of voltage input.
2, measuring resistance
First remove the magnetic lock 12V and 24V switching jumper (Note: no power), generally have 4 terminals (jumper), measure the red and black lines, resistance is about 50 ohms good.
3, after the power measurement current value
It is better to measure the current value after the magnetic force is turned on 12V. A magnetic lock of 280KG (600 lbs.) is generally preferred at 400-450 mAh. If it is less than 450 mA, it will not be able to pull. If 24 V is applied, its nominal or actual value should be 200 mA.
4, insulation value
The qualified magnetic lock should have an infinite insulation value, and the specific value should be more than 50 megaohms; the specific test position should be the steel strip and lock body output line (any one).
5, the verticality of steel cut-off piece
In principle, the cut-off steel sheet should be minimized by touching or stained by hand. The perpendicularity and parallelism of the qualified magnetic lock cut-off steel sheet should be as standard as possible. The quality of the steel plate plating should be based on whether or not there are traces of oxidation on the steel plate.
6, Glue inspection
Magnetic lock colloids can not appear bubbles, should be flat and tidy, no cracks, angle square.
7. Steel cut distance
The main concern is that the thickness of the steel cut piece should be 0.35mm, which is the best. At present, most of the products on the market are using 0.5mm steel pieces; the tighter the steel piece on the lock body is, the closer the better, pay attention to observe the cut piece. Do not see glue in the alignment.
8, no residual magnetic
General magnetic lock plate is made of pure iron, but most of the lock plate is 99% pure iron, so it must have the function of residual magnetic, equipped with a protruding rubber pad, play a buffer role, anti-resistance device The lock will reduce the tensile force of about 35 kg; if 99.9% pure iron is used, the generation of residual magnetism can be basically eliminated without the residual magnetic device, and the pull force is sufficient.
9,4007 diode
In particular, the locks that do not have indicator lights and signal output will normally be added to the positive and negative poles of the power supply of the lock. This time the processing obviously reveals the materials of the locks, but they do some protection work to prevent positive and negative. Extremely wrong or shock access control.
10, lock body shell processing
Lock body shell is generally used oxidation drawing or oxidation sandblasting, especially oxidation sandblasting, fine sand is excellent. The drawing is neat and the bills are evenly distributed, and the cutting surface of the shell steel body is smooth.
11, high and low pressure
When the pressure is low, the lock can still work, but the pull force is reduced; when the pressure is high, the lock will become hot. At this time, attention should be paid to the temperature rise. If the temperature rises by more than 20 degrees, it is a bad product. Generally, the temperature rise data can be obtained within one hour. .
12, acidity test
Applying a weak acid to the steel locks of the lock body, oxidation will occur only after 45 minutes of a good lock, and poor oxidation usually occurs in 15 minutes. In addition, the lock body can be soaked in water, and it is a bad thing to blacken within 24 hours.
13, finish
Drop a small drop of water on the cut piece of the lock body to observe whether the flow is smooth and whether it is dragging mud or water. The smoothness of the smooth water is excellent.
14, lock body plating
Pay attention to the quality of the electroplating on the side of the lock body. Wrinkles and darkening are the key to plating.
15, the output line
Two cores are no signal output power locks, and five cores are gated detection outputs.
Magnetic lock installation method
The first step: first use a screwdriver to open the cover, and then use a hex wrench to punch the board, ready to install
Step two: Take out the installation board, fold the board along the dotted line, put the board in the position where you need to lock the board, then mark the place where you need to punch and punch it.
third step:
A. Following the fixing of the iron plate, insert the Allen screw into the iron plate, place the rubber washer between the two metal washers, and then set it on the Hexagon screw. Insert the iron plate into the three holes in the door and insert the mushroom head from the other side of the door. Use a hex wrench to lock the iron plate on the door.
B. Fixing of the side board, the side board is fixed on the previously punched door frame with two semi-circular head screws (fixed in the long hole of the side board). Note: Do not lock the edge plate so that it can move forward and backward to facilitate the correction of the position.
C. Correct the position of the side plate so that the position of the side plate and the relay plate is appropriate, so that the lock body can be in close contact with the successor plate.
D. After fixing the lock body and the side panel to lock the semicircular head screws of the side plates, lock all the countersunk screws, and then remove the semi-circular head screws and drill holes in place for wiring. Finally, use a hex wrench to lock the lock body on the side plate.
Editor's summary: The principle of magnetic locks and the identification of magnetic locks are introduced here. We hope to help everyone. If you want to know more about yourself, you can follow the information on this site.
Siphon principle Refrigeration principle Magnetic lock principle
Cat climbing tree tower,Big Climbing Cat Tree,Cat climbing tree for indoor cats,Cat climbing tree,Cat Tree Furniture
Guangzhou Aiberry Pet Products Co., Lt , http://www.aiberrycn.com