Thorough and effective measures are as follows-
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:
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!
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:
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.
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:
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.
Take a magnet to pick the lock body, 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! ! ! 400 yuan. 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 larger than 20 mm, which can be the lock hook of the pipeline, or a good lock is used, one or more steel bars are welded on the original lock hook, or the faucet iron pipe is put on, and the blade of the current portable hydraulic clamp can not be opened so big.
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.
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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.
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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.
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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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Why are foreign labor costs more expensive than domestic ones, but cars are cheaper than domestic ones?
This is the embodiment of the industrial base.
In areas with weak industrial and theoretical foundations, the cost of building cars is high and the performance is far less than that of developed countries. It is the same for all industrial manufacturing industries, including missiles, airplanes, electromechanical products, mold manufacturing, bearing manufacturing and so on.
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At present, it is found that melamine in milk powder is artificially added or not completely removed in the production process.
Many imported instruments, such as infrared spectrometer, gas chromatograph, liquid chromatograph, mass spectrometer, laser scatterometer, nuclear physics detection instrument, etc. It can not only analyze whether there is melamine, but also distinguish artificially added starch, oil and protein from natural oil in milk and protein's fingerprints, and also distinguish gene fingerprints; In layman's terms, protein, which is really harmless in dairy products, can accurately distinguish the respective contents of natural protein and artificially added protein in milk. This is a very simple routine operation, and the technology is completely open. Large dairy enterprises have complete sets of related series of supporting instruments, and the rest is up to you to answer.
In Sanlu milk powder, your discussion of XXX and the discussion of netizens are unprofessional. At present, the detection results of various imported instruments, such as chromatography instruments, are many curves like overgrown peaks, the height of the "peak" is the content, and the protrusions and unique burrs of each known structural substance "peak" are "fingerprints", which reflect the characteristics of different substances. It is enough to draw a curve for normal milk. Once new substances, even trace amounts, are added, new "peaks" will appear in new areas; The height of the peak is its content.
It's like testing a new radio station with a field strength meter and a frequency spectrometer.
What doping testing, pesticide testing, are done in this way.
Print out the "fingerprint" and curve of a known single substance, and you can compare them conveniently.
Please take a walk to the analytical instrument factory. If the composition of Chinese patent medicine is complex, it can also be analyzed whether natural bezoar or synthetic bezoar is used.
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Is there a chicken or an egg first in the world?
The chicken comes first, and the early chicken has no eggs. With its evolution, the physiological structure and tissue morphology of chicken also evolved, gradually transitioning to eggs.
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Manufacturing technology of bicycle aluminum alloy rim
Don't lose money.
How can you grab food when others are living well?
The market is too small.
First of all, aluminum profiles should be extruded, processed in batches and opened. China's aluminum performance is poor, so it can't be a high-end racing car or a big plane. This 500 thousand is not enough for the first batch of goods
Cut the profile, then roll it into a circle with several wheels and weld it with carbon dioxide gas protection.
Drill spoke holes. Don't lose money.
There are imported aluminum materials and production lines, which cost tens of millions. Domestic equipment belongs to special equipment, so you can do it yourself. If you entrust someone else to design and manufacture, you will definitely lose your life.
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What is the brand, model and price of the lightest electric moped, and what stores sell it?
It is produced in Beijing, Beijing Shenzhou Judian New Energy Technology Co., Ltd., mainly producing power lithium batteries, with one of the smallest bicycles, ultra-light weight and aluminum alloy body.
The price is 3,000 yuan, and the battery accounts for 1500 yuan. The battery is in the middle of the bicycle bar and inside the bar. You can run 15km on a single charge, which is about 10 ampere-hour capacity, 24 volts. The front wheel drive is adopted, and the motor is installed on the front fork. The plastic rim on the front wheel has internal teeth, which are consistent with the gears on the motor.
Shenzhen ZOOM Ruim, Shenzhen Xinlong Health Industry Development Co., Ltd. (No.Longfa Road 1 1, Longhua Sub-district Office, Bao 'an District, Shenzhen, Store: No.35 Wenxin 1st Road, Nanhai Avenue, Nanshan District, Shenzhen, 0755-8313/KLOC-0. Moped and electric vehicle are different in design, structure, technology, engineering difficulty and safety, so they cannot be confused. Here are their differences.
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Where can I find a Japanese Yamaha electric bicycle monopoly in Qingdao (telephone number)
At present, most of them are smuggled, and the price in 500 yuan is about 1000 RMB. This kind of car is different from domestic electric cars, and it is power-assisted. If you don't ride a bike, its motor won't turn, and the riding torque is directly proportional to the driving current of the motor. When your riding torque exceeds a predetermined threshold, the driving current of the motor will linearly decrease. When your riding speed exceeds 16 km/h, the driving current of the motor will decrease linearly. When the bicycle speed exceeds 24 km/h, the driving current of the motor will drop to zero. If the wheel is stuck, you should apply a torque to the pedal of the bicycle for electric maneuver. If the car still doesn't move, cut off the input current of the motor, turn off the switch and restart it. Japanese law stipulates that bicycles should have headlights. Generally, generators driven by friction front wheels are used, and a few of them are drum generators with front wheels, rotating external permanent magnet tiles and fixed internal permanent magnets. A structure similar to the motor pulse tachometer generator in industrial control is adopted, and the generator coil is clamped by soft iron with thorns on both sides. Bicycle generators in the history of China were single-stage structures with external lines. Most mopeds in Japan are three-speed internal transmissions, usually with a central motor, a reduction gear and an overrunning clutch. Most smuggled Japanese moped batteries have reached the cycle life of charge and discharge, and there are original110v chargers. Generally speaking, Suzuki cars have the largest power.
Just entrust the sailor to buy it. Pay attention to taxes, stealing bicycles is a criminal offence in Japan! Japanese mopeds generally use brush motors, and the maximum power of motors on bicycles is stipulated by law. Hua 1.5 yuan to 15 yuan RMB can be converted into power-assisted and electric dual-purpose without changing the original controller.
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What are the disadvantages of using lithium-ion electric vehicles?
For chemical secondary power supply, the longer the charging time, the smaller the charging current and the higher the number of charging and discharging cycles of the battery. Generally speaking, it is the long life of the battery.
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What kind of bike is the most labor-saving and fast?
700-type tire, 27-inch wheel diameter kilometer racing car is the most labor-saving, but the tire strength is low, and it is still the law that its spokes will prick two holes when embedding grooves, just two at a time, no more or less; You can't drive or pick up people on bumpy roads.
600 yuan/car, bearing material is poor. The normal price is 3,000 yuan/vehicle, at least for bearings in Taiwan Province Province.
Generally, it is recommended to use Japanese-made and smuggled second-hand bicycles, generally 300-500 yuan, ordinary tires with 24-inch, 26-inch, 1 and 3/8-inch sections, which are quite suitable for long-distance riding, such as salesmen who send plane tickets, photos and express delivery, and home appliance maintenance personnel. Imported ones with cross sections of 27 "/kloc-0" and 3/8 "are also very good. Suitable for tall people, generally similar to the front diagonal beam of women's cars. The disadvantage is that tires need to be purchased from rubber enterprises in Taiwan Province Province, such as Jianda Zheng Xin, Jianda and Huafeng, which are not available in many areas. The brand-new bicycles produced by China, a Japanese-funded enterprise, are not as good as the second-hand Japanese bicycles smuggled in. Pay attention to motorcycle locks and handcuff bicycles to fixed water pipes and traffic signs to prevent theft. Mountain bike tires are too wide, suitable for riding on rugged mountain roads, suitable for carrying heavy objects, and it is tiring to ride on urban roads.
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Why not made in America?
During my stay in the United States, I couldn't find American products when I bought local specialties!
Parts in electronic products, machine tools, mold materials, key metal materials and chemicals that produce molds for domestic export products. American manufacturing is everywhere, and it is in the basic and key parts. You should analyze China's manned spaceflight project, the design, manufacture and materials of military equipment. Therefore, the United States stipulates that if the satellites of the United States and its allies contain American elements, China will not be allowed to launch satellites, and China's business of launching satellites for foreign countries will be compressed to individual third world countries. Even if the production place of this equipment is not in the United States, the patent of production equipment and design technology may be in the hands of Americans. These are all public information, and there are many online in China. I am an expert in design and manufacturing, and I know these limitations.
The simplest and most natural textiles, printed matter, bamboo and wood products, dyes, pigments, inks, pesticides, quarantine inspection, etc. Are indispensable. Whether it is self-purchased instruments or entrusted inspection, the cost is comparable to the material procurement cost of the whole batch of manifests. What lead-free welding materials (electronic products are essential, and resistance bonding cannot always be used), environmentally friendly zinc alloys (commonly used materials for handicrafts), and environmentally friendly copper are all thresholds.
For example, Yili Company invested more than 7 million yuan, and Mengniu Company invested more than 10,000 yuan 10, and urgently purchased advanced detection instruments such as ELISA, HPLC, HPLC-MS and GC-MS..
As far as cheap handicrafts are concerned, without the identification of various testing instruments made in the United States, such as hand-held high-energy ray nondestructive testing, these products cannot guarantee to meet the safety standards of the United States, and some materials, coatings, production equipment and technologies have to be imported. The system and theory of modern science are all established in the west, and we are all marching in other people's routines. People have a long history and most of their energy is concentrated on infrastructure. Your attention is only focused on a few cutting-edge products, which is only a very small part of the western market. The investment share and consumption ratio of industrial technology and equipment in western industrialized countries are opposite to that in China.
Finally, the following suggestions are put forward for the development of China:
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What did Shenzhou VII fly out at the moment it opened the cabin?
Internal and external imbalance, the flow rate of the air release valve does not drop, the medium is not completely released, and the diffusion is determined by time and the cross-sectional area of the channel. Without backwashing, you need to use a vacuum pump for active exchange, which can't be done naturally in a short time. The vacuum system also needs to cascade pumps with different principles. Moreover, the porous materials, foaming materials, interlayers, thermal insulation materials and textiles in the space suit and cabin all have gas adsorption, which is not released immediately after decompression, and there is a delay. Technically speaking, the term is the diffusion rate of gas molecules, and the effective cross-sectional area of the communication hole between some cavity structures and cabin space is too small; Vacuum technology has the process of heating to remove metals and nonmetals to represent gas absorption. Electron tubes and incandescent bulbs have gas adsorbents. An electron tube is a small metal box with holes near the filament, which contains a gas adsorbent. Idiot light bulb coated with phosphorus getter on glass rod.
There are liquids in the cabin, such as sweat drops, water vapor, lubricants, grease, volatile organic compounds, fingerprints left in the process of processing and manufacturing, body fluids, etc., which evaporate rapidly in a vacuum environment and expand rapidly in volume. In the future, the cabin should be cleaned with solvent before liftoff, baked and degassed to minimize the residue of cleaning agent.
This is the reason why the hatch is forcibly opened by unknown pressure and the object flies out of the cabin, which shows the flow direction of the medium.
When the sealing rubber strip of the cabin door is under pre-pressure and one side is in vacuum environment, the gas release of the rubber strip will inevitably adhere to the airtight surface, which makes it difficult to open the cabin door after decompression. The solution is to change the opening mode of the door sealing strip from rigid integral opening displacement to flexible structure, and adopt non-planar integral displacement and non-circular local gradual displacement to open the door, which puts forward higher requirements for the design, processing and reliability of the door, and can partially establish gas microchannels to generate expansion space to reduce the difficulty, such as turning annular slots or drilling many fine holes on the annular sealing surface, and increasing the valve to release nitrogen to assist opening.
The electric energy storage shock absorber was notified to China Aerospace Department several years ago and used in astronaut seats.
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What impressed you most about the successful launch of Shenzhou VII and Shenzhou VI?
The industrial base is poor, there is no accumulation, it is too hard to do, and it is not innovation. It is a systematic integration of international technology and finished products, which cannot stimulate economic construction and does not belong to sustainable development and value-added activities. People's basic physical quantity measuring instruments, chemical analysis instruments, electronic instruments and mechanical instruments can all be fine and sensitive to minus 20 power, and China will be minus 6 power. How to use space technology to sell basic instruments? ; People can innovate independently without the environment at that time. At that time, the level of design and technology reflected endless leading ability, so they could turn relevant progress into new products and processes on the market. MIT's latest textbooks are published on the Internet. Have you got the actual ability to catch up with the top scholar? During the Cultural Revolution, China was independent and self-reliant, but really mastered the basic industrial manufacturing capabilities. Can it be realized now without relying on foreign manufacturing equipment? The maintenance ability of machine tools is not as good as it used to be. If a large number of industrial valves and pumps can be exported to Germany and the United States with self-made machine tools and smelting materials, and the quality is better than their top valves, it is indeed space technology that has promoted the scientific and technological revolution in China.