Basic knowledge of access control locks

Date:Dec 07, 2018

The electric lock that is disabled by the door is an important part of the access control system. It is the actuator and key equipment of the access control system. If the access control system is compared to one person, the electric lock is like the human hand and foot, which is related to the stability of the entire access control system. Sex. If an access control system controller and card reader are good, if the quality of the electric lock is problematic, it will also cause the door to open, which will affect the acceptance and use of the project.

         The implementation equipment for the access control mainly includes electronic locks, electronic revolving doors, three-bar gates, gates and other controllable electronic mechanical equipment; this article is mainly for electronic locks: electronic locks include electric locks (anode locks), cathode locks (Electric lock), magnetic lock, electric lock, etc.; electric plug lock is mostly used for two-way 180° door opening, its reliability, aesthetics and practicability are good, the electric plug lock itself has low fault, and its system is often The reason for the failure is that the floor spring mounted on the door often cannot be properly closed in place due to quality problems. In order to strengthen the stability and stability of the system, it is generally used to select the quality of the ground spring as the basic guarantee, and then install a positioning bead on the door frame, so that it can meet the practical needs. Electromagnetic locks are often used on one-way doors that open outwards, and their reliability and practicability can fully meet the needs of users. The electromagnetic lock itself has a very low fault. As long as the circuit is wired correctly, generally no maintenance work is required, and since the mechanical impact sound when the door is closed is small, it will be widely used in the intercom door opening system of the residential building in the future. Due to its low production process and low technical content, the electric locks are currently produced by many manufacturers in mainland China.

        Most of the manufacturers of electric locks are concentrated in Guangzhou, Zhejiang, Tianjin, Liaoning and other provinces and cities, and the world's most advanced production technology and technology are still in the hands of Germans, Japanese and Taiwanese. The technology of electromagnetic locks is currently in the hands of the Chinese. With the continuous penetration of Taiwanese manufacturers, the proportion of electromagnetic locks produced in mainland China will gradually increase. The technology and technology of electric mortise locks have been mastered by some manufacturers in China. However, its performance and appearance are still different from those of similar foreign products. If it takes time, it will catch up with and exceed the world's advanced level.

         So how do you choose an electronic lock?

        Domestic or imported?

         Imported electric locks are too expensive, the purchase price should be nearly a thousand, and there are no more than a thousand pieces sold to users. It is impossible to get down. Although the real import locks are mature, the repair rate of products is low, but the service is low. It’s still a problem. Once there is a problem, foreigners can’t move and say that China’s power is unstable and many other reasons are very troublesome. I suggest that you still buy domestic locks, and the price is very affordable, and most of them are produced or integrated into Taiwan's manufacturing process (Taiwan is the main OEM base for foreign electric locks) and quality standards, and the difference is not much worse.

        Is the electric lock still an electromagnetic lock or an electric lock or an electric lock?

        What kind of lock should I match? It depends on what kind of door you are? Double-open (can be opened inside or outside) glass door is best to use electric plug lock, the company's internal single open (only open or only open) wooden door is best to use magnetic lock, magnetic lock is also called electromagnetic lock. The magnetic lock body is installed on the upper part of the door frame. Some people think that it is not hidden and not beautiful. In fact, it is used in foreign countries. Foreign magnetic locks are used more than electric plug locks. The stability of magnetic locks is also higher than that of electric locks, but the safety of electric locks is high. The electric lock is installed on the door side and the mechanical lock such as the ball lock. The safety is much lower, and the wiring is inconvenient, but the price is cheaper. It is not recommended. It is best to buy magnetic locks and electric locks for the community. The electric locks are relatively loud. The general building intercom is equipped with electronic locks. Now there is also a silent electric lock, which can be considered. However, no matter what lock you use, you should pay attention to rain protection. The locks are made of iron and are easy to rust. This should be noted. There is a power-off lock in the market. This kind of lock can meet the requirements of the customer still closing the door after power failure, but it does not meet the fire-fighting requirements. It may not pass the acceptance, and it has requirements for the thickness of the door frame. Unexpected trouble, so it is still less recommended to customers.

        Most of the manufacturers of electric locks are concentrated in Guangzhou, Zhejiang, Tianjin, Liaoning and other provinces and cities, and the world's most advanced production technology and technology are still in the hands of Germans, Japanese and Taiwanese. The technology of electromagnetic locks is currently in the hands of the Chinese. With the continuous penetration of Taiwanese manufacturers, the proportion of electromagnetic locks produced in mainland China will gradually increase. The technology and technology of electric mortise locks have been mastered by some manufacturers in China. However, its performance and appearance are still different from those of similar foreign products. If it takes time, it will catch up with and exceed the world's advanced level.

        So, how to buy electronic locks? Please pay attention to the basic common sense of the answer below:

        Basic purchase knowledge of electric mortise lock

        First of all, the lock surface should have a metallic luster, and there must be no obvious scratches. The standby current is about 300 mA, and the operating current is lower than 900 mA. After a long period of power, the surface is slightly hot, but not hot. The force of the electric mortise lock should be sufficient. After the pressure is pressed, the lock can automatically bounce and be powerful. It is best to perform 4000 times of continuity test. If it is found, the lock is weak during the process, or the bounce is not in place, or the bounce If you don't get up, it is considered unqualified Some engineering consultants ask: Is it a two-wire or multi-wire electric plug lock? This is the case. The multi-wire electric plug lock is controlled by a single-chip microcomputer. The operating current of the electric lock is controlled by the single-chip microcomputer, and the lock body will not It is too hot, and has a delay control function and a door magnetic detection function; the delay control function can be adapted to the use of a door with a bad spring, and the door magnetic monitoring function can provide a real-time monitoring function of the door opening and closing state for the controller. Although these functions are not necessarily used, the quality and stability of the electric locks controlled by the single-chip microcomputer and the electric lock without the single-chip control are not at one level. Therefore, it is recommended that you do not need to save a little money, the two-wire electric plug lock, the internal structure is very simple, just a mechanism that drives the electromagnetic coil, the working current is large, and the heat is severe enough to damage the electric lock at a certain time.

        Basic purchase knowledge of electromagnetic lock

        The appearance should be exquisite, the surface should not have obvious scratches or rust. The key of the magnetic lock is to look at its tensile strength; this requires professional equipment to be measured, so only after installation, the hand pulls a sudden force It is normal to pull it off, but it should be noted that the installation of the electromagnetic lock body should be consistent, and the suction iron should not be installed too tightly, otherwise it will affect the tensile strength.

        In the selection of locks, first of all, we must first distinguish between 90 degree opening (one-way opening) and 180 degree opening (two-way opening). 180 degree opening must use electric plug lock, 90 degree opening can use magnetic lock, electric Control lock, cathode lock, glass door lock, electric lock, etc. The door closer is determined by the weight of the door. The weight of the door is determined by the volume and material of the door. The stand is chosen for aesthetics, safety and convenience.

        So how do you identify locks from various technical indicators?

        Magnetic lock identification

Standard qualified magnetic locks generally provide 12V and 24V input voltages (the difference between single and double coils), which are selected and switched by jumpers. To judge the pros and cons of a magnetic lock, there are several ways:

1, look at the circuit board

The inferior magnetic lock can be judged from the circuit board. The inferior magnetic lock circuit board is rough and the layout is extremely simple. There is no varistor (that is, the surger is generally two), and there is only one set of voltage input.

2, measuring resistance

First remove the 12V and 24V switching jumpers of the magnetic lock (note: no power is required), generally there are 4 binding posts (jumping lines), measure the red and black lines, and the resistance is about 50 ohms. good.

3. Measure the current value after power-on

It is better to measure the current value after the magnetic lock is connected to the voltage of 12V, which is consistent with the marked value. The magnetic lock of 280KG (600 lbs) is generally 400-450 mA. If it is less than 450 mA, it is not enough. If it is 24V, the marked value or actual value should be 200 mA.

4, insulation value

The standard qualified magnetic lock should have the insulation value of the lock body as infinite, and the specific value should be above 50 mega ohms; the specific test position is the steel cutting piece and the lock body output line (either one).

5, the verticality of the steel cutting piece

In principle, the steel cutting piece should be minimized by hand touch or stained. The standard of the perpendicularity and parallelism of the qualified magnetic lock steel cutting piece is better. The quality of the steel cutting plate should be checked by the presence or absence of oxidation marks on the steel cutting piece.

6, glue inspection

The colloid of the magnetic lock can not appear bubbles, should be flat and tidy, no cracks, and the angle is square.

7, cutting steel distance

The main concern is that the thickness of the steel cutting piece should be 0.35mm. Most of the current market uses 0.5mm steel cutting piece; the closer the steel cutting piece on the lock body is, the better the tightness is. Do not appear in the alignment.

8, no residual magnetism

 Generally, the lock piece of the magnetic lock is made of pure iron, but most of the lock pieces are 99% pure iron, so it is necessary to have the function of demagnetizing, and has a protruding rubber pad for buffering function and anti-remaining device. The lock will reduce the pulling force of about 35 kg; if 99.9% pure iron is used, the residual magnetism can be basically eliminated without the anti-residual magnetic device, and the pulling force is sufficient.

9,4007 diode

Especially refers to the locks that do not light the indicator and the signal output. Generally, the diode crystal is added to the positive and negative poles of the power supply of the lock. This treatment obviously reveals that the material of the lock is not closed, and some protection work done here to prevent positive and negative Extremely wrong or impact access control, etc.

10, the process of the lock body shell

The lock body shell is generally made of oxidized wire drawing or oxidized sandblasting, especially by oxidizing sandblasting, and fine sand is superior. The wire drawing is neat, the banknote is evenly sprayed, and the cutting surface of the outer steel body is flat.

11, high and low pressure

At low pressure, the lock can still work, but the pulling force is reduced; when the pressure is high, the lock body will be hot. At this time, attention should be paid to the temperature rise. If the temperature rise exceeds 20 degrees, it is inferior. Generally, the temperature rise data can be obtained within one hour. .

12, acidity test

It is coated with a weak acid on the lock steel cutting piece. The good lock body will not oxidize after 45 minutes, and the difference usually oxidizes in 15 minutes. In addition, the lock body can be soaked in water, and it is inferior to black in 24 hours.

13, smoothness

Drop the small drops on the lock steel cutting piece to see if the flow is smooth, whether it is dragging the water, and the smoothness is excellent.

14, lock body plating

Pay attention to the plating quality of the corners of the lock body. Wrinkles and darkness are not applied to the lock body.

15, the output line

The two cores have no signal output electric lock, and the five cores have door position detection output.

        Electric lock identification

The electric mortise lock has two kinds of beads and magnetic induction, and the touch of the ball basically withdraws from the market.

To judge the pros and cons of a magnetic induction electric lock, there are the following aspects:

1, the diameter of the tip

Suitable for 15-16mm

 2, high and low pressure

The electric mortise lock can generally work between 10V and 18V. Some manufacturers can also achieve 28V. The power supply to the lock body can be continuously pressurized to test its high pressure resistance value and test its temperature rise at high pressure. Degree, usually measured in about 5 minutes. The lock consumes a lot of power at startup and consumes more than half of the power during standby.

3. When the electric plug lock works in the opposite direction, when the plug is moved upwards, it is better to listen to the sound, and it is inferior; it is required to withstand the weight of 500-1000g or more.

4, recovery power

Applying 200-300g of force in the middle position of the popped tip (the direction of the force is the vertical direction of the tip), the tip must work normally; the lock can be manually shot, and the pop-up flexibility and restoring force of the plug can be tested. .

5, oriented

Whether there is a plastic ferrule at the exit of the spigot, it plays a guiding role; and observe whether the spigot is inclined or biased.

6, broken magnetic circuit

Remove the magnetic piece at the lower end of the main lock body, and the lock insert tip must remain stationary (the removal distance must be greater than 5 cm). This method is used to test the operation of the lock when the magnetic disconnection occurs. Inferior locks can cause the lock to work (retract the plug) as long as it is separated by a thick piece of paper in the magnetic circuit.

7, the feedback line of the lock

2 cores are wireless circuit boards or locks with no starting current and standby current, only positive and negative power lines; 3 cores are added with positive and negative power lines to add a lock detection (generally NO, shared negative ground wire) 5 cores for adding positive or negative power lines to add a set of lock position or door position detection (set of three lines, NO, NC, COM); 6 cores for 5 cores based on adding a switch signal line (shared negative Grounding); 8 cores have a set of door position detection (3 lines) and a set of lock position detection (3 lines) after having positive and negative power lines; 10 cores are added to a set of 8 cores Switch line.

8, thermal fuse

Locks that do not have a thermal fuse will cause the lock to burn out or cause more consequences when the temperature rises to a certain value, and the lock with the thermal fuse can interrupt the locked power supply at a certain value; The fuses are divided into one type, one is a common fuse, the fuse must be replaced after the dissolution, and the other is with a reset function. After the interruption, it can be restored after waiting for a certain period of time.

9, switching signal

The switching signal is generally a passive signal, but the passive signal is susceptible to interference, so there is also a switching signal with optical coupling function.

        Smart access control products are closely related to the lives of people in developed countries. The fully enclosed revolving door that we are not familiar with is already common in foreign countries. In the subway stations in the United States and Europe, where there are a lot of people in the subway station, they have a good way to guide the flow of people. One of the measures for the fare of the subway fare is that the Beijing subway does not count the number of fares and the use of the flow of people. It is a fully enclosed cross revolving door. The intelligent channel is lined up in a single-way current-limit control mode, that is, the entry and exit are different channels. All channels do not require manual management. TV monitors are used. Each customer chooses to use coin or inductive magnetic tickets to pass through the cross door. After 120 degrees of rotation, it is automatically reset, and only one person can be used at a time. Induction (or coin-operated), release, pass, reset, and repeatedly shoulder the heavy responsibility of subway flow control and charge management.



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