Research on bicycle theft

In view of the severe public security situation, car thieves are everywhere, all the time, and the means are not superb. I personally made the most awesome bicycle lock in the world, using a Japanese camera focusing micromotor as the power source. In fact, many wage earners, migrant workers, couriers, logistics workers and cleaners who often deliver goods to their homes make bicycle lock hooks with strip steel with a width of not less than 40 mm and a thickness of not less than 4 mm, and wrap the locks in boxes. The main keyhole should be deepened! ! ! The most effective way to prevent vanadium-chromium steel from forcibly unlocking is that the keyhole is arc! ! ! ! ! Quite reliable, and all stainless steel locks made by ordinary workers. For the common long hook lock, it is very reliable to thicken the arc welded steel bar of the hook, wrap the lock body in an iron box, deepen the keyhole and rotate. In fact, the idling lock of Zhejiang website Chen Li is very reliable and the hook is thick enough. People who are often stolen cars are people who can only read and have no manufacturing ability, and can only live in a circle where they are constantly stolen. Now college students are looking for entrepreneurial themes, which is a good doorway.

Self-made locks and self-modified existing locks are the embodiment of testing ability and the foundation of building a country. Specific measures are detailed as follows:

The security guard in this community caught the car thief again and seized the hydraulic clamp. The ordinary lock broke after three shakes, and the clamp was one foot long. There are also various mandatory keys. After learning the news, I launched a social investigation again and saw several brand-new hydraulic pliers, so I decided it was appropriate to make my own locks. For ordinary citizens, the best policy is to buy idle locks, and then weld some steel bars or pipes on the lock body and hooks. The equivalent contour diameter and scale exceed the opening of ordinary hydraulic tongs, so don't worry. Pay attention to handcuff the car body to a fixed object.

Person in charge of report:

The following are practical and effective safety precautions, with no commercial content. They are updated according to my previous posts. They are public welfare posts with wide application value. Please ask the webmaster to publish them.

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If you are the police chief, what can you do to deal with bicycle theft?

Person in charge of report:

Responding to the instructions of the great leader Chairman Mao, selecting and training cadres is the key to the success or failure of the revolution. How you choose the car lock determines the safety of your personal property. Serving the people now, providing effective guidance, has a wide range of guiding significance, and there is no business information of any manufacturer. Please review it in the future:

Now the wrongdoer is too bold to be afraid of your burglar alarm!

The wiring position of the electric car is open, cut off with one knife and become dumb on the spot! Or the rigid anti-theft device in the physical sense is reliable, and those "high-tech alarm products" are virtual. If you are indoors or connected to the local public security department when you call the police, it is ok for someone to check it immediately; With standard and familiar equipment, wiring mode, familiar alarm principle and familiar equipment appearance, no non-standard and self-made equipment is reliable.

You have completely answered the question "What feasible suggestions can relevant departments adopt to prevent bicycles from being stolen". ? Thank you ",because it involves the detailed information of the production enterprise, it was deleted by the network management and published an advertisement. Websites should also learn from Scientific Outlook on Development. For major topics involving public interests, the original investigation report shall be made public.

In the public security department, before the reform and opening up, there were lock detection and lock production management departments, and the locks produced had to be appraised by the public security department.

The public security department knows all kinds of ways for thieves to break locks.

In the early days of reform and opening up, many people called for strengthening the safety of bicycle locks, and there were indeed many such products. As long as I lock my bike on a fixed water pipe, a fixed traffic sign pole and a fixed handrail, thieves really can't open it, cut it and break it. Network management is not allowed to publish the specific contact addresses of related enterprises.

Now there are stainless steel bicycle locks, idling locks, Z-shaped keys, U-shaped keys and carburized and hardened lock hooks. Idle lock is characterized in that common tools, keys and iron sheets can turn the lock core, but keys made of high-strength steel cannot be forcibly opened; The original key can open this lock.

There are thick iron pipe locks, copper locks and locks produced by introducing German technology.

Generally, locks with wholesale price above 35 yuan will do, and locks with wholesale price to 70 yuan will be the highest security level.

There are motorcycle locks with wholesale price 100 yuan/piece in the market.

General wholesale price 50 yuan/lock. Buy 120 yuan/Lock to 180 yuan/Lock in the retail store. The ex-factory price of motorcycle locks hollowed out by Fangtie is more than 60 yuan/piece, compared with 20 yuan/piece in previous years; Motorcycle locks with copper lock bodies used to cost more than 30 yuan/piece, but now 100 yuan/piece. It will be more expensive if you use environmentally-friendly copper materials that meet the recent European requirements.

Taobao has a button digital password bicycle lock, which used to be 60 yuan.

Just look for it in the motorcycle parts wholesale city near your residence. Merchants won't tell the truth, so judge for yourself.

Bicycle locks sold in bicycle shops and bicycle repair shops are basically unsafe.

The locks of several brands recommended by netizens are only safe with high-grade locks from the original factory, and it is not possible to buy the same brand in the retail market.

Bicycle locks recommended by some local small public security bureaus are still low-grade locks, and the profits of merchants are half and half.

Therefore, there is no access system for the sale and production of low-grade bicycle locks, which endangers public interests.

Therefore, this is the work of the public security department, the industrial and commercial bureau and the quality supervision bureau, and should be led by the government.

A broken lock can only be opened with an electric grinder. You can choose an unconventional key to reduce the possibility of theft, or you can choose a lock with lower security to lock the bicycle with a fixed object.

The former has no jobs, but the latter monopolizes resources and power, which is endangering national security!

The biggest obstacle is that what can be done is not allowed to be done, and what cannot be done is in the hands of mediocrity. It's not a question of treatment, but there is no post at all, no access to the laboratory and no use of idle ordinary instruments. If your question recurs in Zhou Enlai, it will be easy to solve. And the locks that meet your requirements have been on the market for a long time, from molds to production lines. There is no need for scientific research, re-development and re-investment. There is nothing in the hardware market and bicycle retail market, and citizens have no ability to judge and investigate.

Some simple suggestions:

Don't install the lock firmly on the bicycle body, which will facilitate the thief to exert his destructive power.

The lock hook is larger than 15mm in diameter and is generally made of low carbon steel. The wholesale price below 25 yuan is not carburized, and the hardness is not enough, so it can be cut. Carburizing is called "hardening type" in the commodity. Another way to judge whether carburizing is completed is to use a manual saw blade or a steel saw blade with a length of 300mm, a thickness of 0.64mm and a width of 12 or 13mm. The carburized lock hook can't be sawed in, and the saw blade slides straight on the lock hook. Accordingly, the effective diameter of the chain is generally not carburized, and stainless steel can be thinner, because stainless steel is soft and tough and sticky when cutting; Generally, metal pipes with a diameter greater than 20 mm and a wall thickness greater than 1.5mm will be cut continuously. At least, the opening of scissors is not that big. Even if the opening is large, there is not much shear force applied, because the levers are inclined to each other and it will slide. You can use the tap water pipe of the faucet.

Open the hook and turn the key, you can see the lock tongue, which is the part of the lock body that blocks the hook, and the steel ball with the diameter of 10 mm is reliable; Generally, the lock tongue is stamped with low carbon steel, with a thickness of less than 2 mm and a width of less than 15 mm, and the lock tongue protruding from the copper lock core is not resistant to impact.

Pick the lock body with a magnet, and the lock body is made of iron. The thickness of the lock body tube should be greater than 2.0 mm, otherwise the pin will be weak. Those locks with embossed fonts are usually die-cast with zinc alloy, which is too fragile.

The whole copper lock body is basically not produced now, and the charge is 80 yuan/handle to 150 yuan/handle, which is quite heavy.

In reality, a better lock body is made of a whole piece of iron, and a cavity is dug in it with a milling machine or lathe, rather than a cheap product cut with a square tube or a round tube.

Originally, both the cross key and the crescent key can be used, but in fact, many locks have a small number of marbles, a small stroke range (large height difference between teeth), and even do not need spring reset. The bronze medal and material of copper lock core are poor, and the diameter of marble is small, the number of marble is small, and the height of marble is low and unreliable.

You can usually find a key with teeth on both sides, a square rod and a key with notches milled on both sides.

The key of sleeve shape also depends on the number of marbles, the height of marbles and the firmness of pins.

The best locks are original, which can improve the industrial base level of China. It is suggested to implement the national system, national competitions and competitions. I have seen some bicycle locks made by cyclists. This truly reflects the basic industrial level of the people. What is really confidential is the lock with high precision and abnormal structure made by ourselves, which is not in circulation in the market.

For example, the lock of the Beijing collider can only be opened by two people using mechanical keys at the same time, and the cockpit lock and prison lock of military aircraft are customized; The communication security machines of military, diplomatic and government departments in various countries are all designed and produced by themselves. As a sovereign country, this kind of equipment is not imported for key sectors.

I have published a paper on curbing crime in English at international academic conferences, which belongs to daily life knowledge.

Nowadays, hydraulic tongs are popular, and the common hook diameter is15 mm. When the blade of the hydraulic clamp is pressed into the hook less than half, the hook will break! ! ! Maximum opening of domestic hydraulic tongs 12 mm 360 yuan; A The maximum opening in 390 yuan is 16mm, and some openings are 14mm. Generally, the retail price of A with a maximum opening of 20mm can be one in 350 yuan, and that of imported manual hydraulic pressure is 80mm. Use hydraulic tongs in remote and dark places; Use a hard key to unscrew it in a crowded place.

The diameter of the self-made lock hook is greater than 20mm, which can be a pipe hook, or a good lock can be used. One or more steel bars are welded on the original lock hook, or the faucet iron pipe is put on. Nowadays, the blades of portable hydraulic tongs can't be opened that big. Note that the lock body and the lock hook are hinged or hinged, or the lock hook and the lock body can be separated, and there should be a hanging shielding widening reinforcement at their joint to prevent thieves from getting pliers from here. For the lock body of zinc alloy, the lock body of zinc alloy has been welded with an iron shell, the lock hook has been welded with three rebar strips with a diameter greater than 1.2mm for use in the construction site, and the keyhole has been welded with an elbow with a thickness greater than1.5mm. To unlock the lock with a key, it is necessary to rotate it from the side and extend it into the keyhole to prevent the straight rod from forcibly invading the key illegally. After being locked by a fixed object, people who stop at various occasions every day and deliver goods everywhere have experienced several years of actual combat. ! ! ! !

For the safety evaluation of the lock, the first step is to judge whether the lock core can be unscrewed by violence. After all, ordinary people cannot judge. You can enter the keyword "idle lock" online and buy this lock first. It is characterized in that a common key or screwdriver can freely rotate the lock core without opening the lock core. Then the lock body and the hook are welded and reinforced with iron pipes, steel bars and stainless steel pipes.

For the residents who live upstairs, we can see if we can make a lock hook with a tap water pipe, drill two big holes in the wall with an impact drill, put the lock hook through the other side of the wall, and lock the lock hook on the other side of the wall with a lock, but non-residents are required not to go to the other side of the wall. It should be noted that the tool for manually cutting pipes was born 50 years earlier than the hydraulic tongs. Although the lock hook made of water pipe is beautiful and neat, it should be welded with medium-diameter steel bars to prevent manual cutting of the pipe. Because the surface of water pipe is hot dip galvanized, direct welding needs to burn zinc and so on. , so it is impossible to weld. First, use an angle grinder to grind off the galvanized layer at the welding position.

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There are all kinds of keys, how to design and make them?

There are so many locks in the world, which means there are so many keys. The lock is for others. How can you make each key different? Even though some of them are universal, most of them are not. Is it necessary to design every key?

Every lock has the same blank key.

According to this scheme, in the production process, the interception length of the produced lock core marble matches the drilling and milling depth of the key, and thousands to hundreds of thousands of locks and matched keys can be matched according to the arrangement and combination.

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Does anyone know the principle of one key and one lock?

It's simple,

First, the manufacturing accuracy of lock cores, marbles and keys, such as the number of steps that can be subdivided in a specified stroke, that is, the difference from the highest tooth bottom to the highest tooth bottom may be 100, and the difference may be 20; No matter how high the accuracy is, it doesn't make sense. The keys of adjacent numbers are open to each other. There is little change in key tooth type (number of teeth), so it is very likely that keys with similar key tooth types will be opened to each other.

If there are two marbles, what is the arrangement and combination? What is the arrangement and combination of three marbles?

Middle school students can count. For example, each bead has 10 height levels, two beads have 100 combinations, and three beads have 1000 combinations.

One structure of those low-end bicycle locks may be hundreds of codes, that is, hundreds of keys; The structure of a high-grade lock can have hundreds of thousands of codes, that is, "numbers". For example, imported locks have high manufacturing accuracy, and each marble can have two layers; Large hollow marbles are covered with small solid marbles, and independent marbles swing by gravity to improve safety performance. Compared with the locks in Europe, America and Israel, the locks in Taiwan Province Province are less accurate.

Some low-gear bicycle locks can be opened by 70% immediately with high-strength keys, which has nothing to do with how many keys are arranged and combined in the lock design. As for the locking hook woven with steel wire, the effective diameter should be quite thick to be reliable. It is dangerous for the effective diameter to be less than 12 mm to 15 mm, and the apparent diameter cannot explain the actual effective diameter. The key quantity of lock safety performance evaluation index is design accuracy, and the mutual opening rate reflects the actual machining accuracy.

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Anti-theft doors and windows

We live in a bungalow, and now we want to install anti-theft doors and windows, but I don't know which one is better, stainless steel or aluminum alloy. Please analyze it if you are in trouble, thank you! ! !

If you have money, use hot-rolled solid stainless steel (exclusive, 20 yuan a kilogram) with a diameter greater than 10 mm and an oxide layer on the surface. The layman thinks it is ordinary low carbon steel and does not paint it. With 20 1 brand, the composition can be mixed and mixed, which is more difficult to cut. Mold materials can also be made of high carbon steel and alloy steel bars (there are exclusive stores), and attention should be paid to hardening when supplying. The thickness of the middle and upper and lower gaskets shall be greater than 3mm. Simple, drill a hole in the angle iron and pass through the iron bar. Specifically, it is safe to use an angle iron with a side length of 25 mm or more and a thickness of 2 mm or more as a gasket. Gaskets should be welded with iron bars. If it is high carbon steel, it will be difficult to weld and crack after welding. Unless heated in advance, the upper and lower ends of the steel bar will be lengthened.

The prices of anti-theft doors and windows of stainless steel and aluminum alloy are equivalent to the above standards, while the prices of ordinary low carbon steel are higher and the strength is lower. If you want to do it, you must first ensure that you are practical and secure.

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What equipment should be used for theft prevention?

I have an open-air courtyard with three walls. I want to install anti-theft equipment. No outsiders are allowed in!

I want to install an anti-theft device that can automatically call the police when someone passes by. What equipment should I use?

Buying stainless steel wires with a diameter of more than 0.8 mm is generally common in the specifications of 1 mm and 2 mm.

According to the environment, weave a large mesh to block possible passages.

The maximum aperture of the hole is smaller than the cross section of the human body. The exquisite method is that each intersecting longitude and latitude line is insulated from each other, and it is best to use ceramic mechanical connection and electrical insulation, or to use insulation materials that are resistant to sunlight and ultraviolet radiation and are not easy to age. Then every longitude and latitude line is interpreted by ordinary broken short circuit measuring circuit, which is a reliable anti-theft system and very reliable in the environment of heavy rain and snow hanging! ! ! ! 20 1 brand stainless steel wire will rust about one kilogram in 20 yuan, and 304 brand stainless steel wire will not rust about one kilogram in 40 yuan; Ordinary copper core wire and telephone line are all ok, but the weldability of iron wire is poor, so stainless steel is needed for gas shielded welding. The simplest method is to connect all the longitude and latitude lines in series. In the end, there are only two threads. If they are cut, they will call the police. For the advanced ones, the bridge will be used for balance interpretation, and the local short circuit will also give an alarm. Pay attention to the insulation between the nodes where latitude and longitude intersect, and tie them with insulating materials to prevent thieves from unlocking conveniently. Nail this net to the inner wall, and you can know whether someone is digging holes in the wall from the outside to steal livestock and other property. At this time, thin wires with poor mechanical strength will be used.

Self-made car theft prevention is the most reliable! ! ! ! ! ! ! !

Install alarm fireworks launching device, automatic smoke burning device and self-destruction device! ! ! ! Eject the radio into the air and send out an alarm signal.

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Is there any kind of guardrail that can prevent theft and is allowed to be installed in the property?

In many residential areas in Beijing, for the sake of beauty, it is not allowed to install anti-theft guardrail. At the same time, if the security net is installed outside, it will affect the harmony of the neighborhood and become a tool for thieves to climb! If the old security window can't be opened, and the maintenance of air conditioning is affected, is there a more humanized security window?

The net made of stainless steel wire can be curled and folded. In case of fire, the high-pressure and high-temperature jet generated by initiating explosive device is used to cut the anti-theft net, which is similar to explosive bolts. Or use electromechanical devices to open mechanical locks.

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Excuse me, what is the best intelligent anti-theft lock used on domestic household anti-theft doors without mechanical keyhole?

Design and manufacture by yourself, which is the embodiment of the real national quality, especially in the era when private individuals with ordinary wage levels can do it independently.

There is a keyhole, which provides opportunities for toothpicks, adhesives and others to destroy.

The input board and camera of fingerprint lock have poor damage resistance.

Because I have been laid off and unemployed, I can't guide students to implement it at my own expense. It's not my fault.

Relevant substantive information has been made public internally.

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The car is downstairs. It's unlocked. Who has a good idea to prevent theft?

Because there is no place to put the motorcycle battery car at home, I put it in front of my house. It's a two-story house in my own house and has been visited by thieves many times. I hate thieves now, and I can't sleep well every night. Now there is a three-wheeled motorcycle in front of my house, but there is no lock and no alarm. Who can give me some advice? ...

The easiest way to prevent your problem is to open two holes in the wall at proper positions, that is, buy a water pipe and a right-angle elbow thick enough, connect the water pipe into a ∏ shape, open a through hole at the opening position, insert the opening into the wall hole, lock the opening hole of the water pipe toward the inner wall, or insert a pin into the opening hole of the water pipe. Note that after the water pipes are assembled, the joints should be welded firmly to prevent opening, or a long pin passing through two water pipes should be inserted at the opening of the water pipes to prevent external disassembly. It can also be welded with steel bars, and the total equivalent diameter of steel bars is required to be greater than 20 mm

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Some Problems about Invisible security window

1. The gap between steel wires is several centimeters. Can thieves come in without breaking the wire?

My home is on the second floor (the first floor is the garage). Is it suitable to install invisible anti-theft net?

3. Is the stealth anti-theft net 100% safe? Do thieves really sigh at the invisible anti-theft net?

Of course, security window, this strong thing is reliable. You spend money on electronic waste, which is not as trustworthy as traditional steel bars. If you have money, go to the mold material supplier to buy all kinds of mold steel bars. There are many materials and heat treatment effects that even hydraulic tongs can't stop cutting! ! ! ! ! ! ! Both the Yangtze River Delta and the Pearl River Delta (such as Dongguan) are heavily supplied. Your opponent is a hydraulic clamp.

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Lock in the core price

Mechanical locks generally have a lock core, which can be turned with a specified key.

This kind of lock core is available in some lock factories and key repair workshops, and it has the highest versatility. Generally, the slightly better ones made in China are all made in 30 yuan, with different lengths. The invincible lock cylinder of Israel started from 300 yuan to 400 yuan, while both the lock cylinder of Israel and the lock cylinder of the United States are of full-body threaded structure, which is locked on the longitudinal groove on the outer surface with screws, and generally a lock cylinder costs more than RMB 1000.

The outer diameter of this lock core is the same, with several differences: the connecting rod driven behind the lock core and the lock core are concentric and eccentric. It is particularly important to note that the security of eccentricity is relatively higher, which enhances the resistance to thieves' hard unlocking. In addition, the length of the lock core is also different. For a long lock core with a thin door, it is necessary to use a professional thick gasket to pad the door. If you do it yourself, simply weld a thick iron ring (or several stacked rings), and the outside is longer than 10 cm. The bigger the better, the more resistant to damage and the safer the lock is. You can also pad the lock seat inside the door.

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Family anti-theft

My house is always being stolen ~ ~ either locked or the door smashed. Report it to the police. Now the police do nothing unless they pay money. . . . . . It's farmers who don't care at all. I went out to work yesterday. I came back at night and found that the computer should not have been stolen. Call the police. The police asked me for a receipt, and I bought a computer without a receipt, so the police left it alone. I am sad. My house has been stolen four times. I have to go out to work. I can't watch it at home all day. So I want to install a monitor like that on TV, but I don't understand. What should I say? What to buy? What's the name of that monitor? Can you help me? Hey, the world is crazy. I want to install one of these things at home. Who can help me? thank you

I am a farmer's child, and I don't have much money at home just to fight for breath. I hope everyone will consider my financial situation and give me a suitable monitor, as long as it can record everything during the day, and it is best to be small and hidden. Thank you. I'm about to cry. Why didn't anyone give me a satisfactory answer?

Dig a cellar to bury the treasure while you are away. The standard saying is, be clear.

Or dig a tunnel under the police station and build a storage room to connect with the police station.

Or dig right in front of the police station. All burglar alarms, cameras, security guards, renting warehouses and renting bank safes are exempted. The security of locks, door locks and security doors is based on the time of dismantling, which is much stronger than them.

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The wall is a hollow brick, how can the expansion bolt be stressed?

I installed an invisible anti-theft net, which often touched the hollow brick wall, but the M6*80 expansion bolt was still loose after it was driven in. I wonder if there is any good way.

Grouting! ! ! ! ! ! ! ! Especially pouring expansive cement.

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About impersonating security window.

The baby can already walk, and the window at home is quite low. It's impossible to watch him 24 hours a day for fear that he will climb the window. Do you think it is necessary to install security window?

Life is the most precious! ! ! ! ! ! ! ! !

First, use nylon rope as a net, multi-level, in order to prevent the metal wire from hurting the baby, it is easy to use a metal net with a small metal wire diameter.