First of all, what is a professional manufacturer? It is definitely not a factory or professional manufacturer that can produce and process anti-theft screws. The so-called professional manufacturers must have the enterprise standard QB for anti-theft screws and anti-theft nuts reviewed, filed and approved by the State Bureau of Technical Supervision. Existing laws, regulations and higher-level mandatory standards related to the centralization and standardization of related products industries are the guarantee of the production technology of this enterprise. Laws and regulations suitable for the technical standards of product production of this enterprise. In a word, the manufacturer who takes "anti-theft screw" (anti-theft nut) as the enterprise standard is the real professional manufacturer.
Users of professional manufacturers do not need ISO**** * certification. Even if the enterprise has passed the national standard (international) ISO certification, it can only be said that it is the certification of the enterprise quality management system mode, which does not mean that the enterprise's "anti-theft screw" (anti-theft nut) products and technical production standards have passed the national standard (ISO) certification. Because anti-theft screws, anti-theft nuts and anti-theft caps are all patented products, it is impossible for everyone to standardize production and processing according to a standard. In that case, aren't they all infringed? Because the national standard (GB) cannot be unified, there is no legal basis for ISO certification.
The reason for choosing the products of professional manufacturers is that they have a set of mature production technology and testing methods, accumulated a lot of experience, and also have newer products, which may be small factories or private enterprises. It doesn't matter, because it is the main business, large state-owned enterprises don't specialize in producing anti-theft screws, and even if they have them, they are subordinate companies, branches, workshops and tertiary industries. And most of them are by-products of standard parts manufacturers. Professional manufacturers must have their own enterprise standards, depending on the anti-theft effect of their products, such as user feedback, quality reputation, the nature of the enterprise must be an independent legal person who can bear legal responsibility, and refer to the history of the factory (professional factory). If it is more than ten years, it will be difficult to survive and develop without "housekeeping" products and word of mouth in today's market competition tide.
(2) About the choice of patented products
Almost all anti-theft screws and nuts are patented. Users should read clearly the three basic things recorded in the patent certificate, 1. Name of the patentee. 2. Authorization date and certificate number. 3. The name of the invention project. To prevent some manufacturers and individuals from "selling dog meat", patents are not their own, not their own units, but also fake patents. The product is inconsistent with the patent, "the bull's head is not right." If you represent others, you must have the power of attorney of the patentee, and if you use the patented technology of others, you must have the technology use license of the patentee. We should resist and report products of unknown origin or infringement. The purchase and use of infringing products will bear joint liability, which will lead to disputes and troubles. Protecting intellectual property rights is the obligation of every citizen. So how to confirm the authenticity of the patent? This is very convenient. Enter the patent website and enter the patent name, certificate number, legal status information, etc., at a glance.
Also refer to the date of patent authorization, and choose the latest patent granted recently, because the newer the patent, the higher the technical content. Do you think that a small screw cap will have hundreds of national patents, and each patent has 3-5 patent rights protection (claims), so how big will the coverage of thousands of rights protection be? For example, before patent protection, it was like a mine. To get a new patent, we must go through a minefield full of "mines", pay the price of wisdom and new technology, and it must be unique.
(3) It is best not to use special tools.
Depending on the purpose of prevention, such as car tires (wheels) or those that need to be disassembled frequently, of course, there must be special tools, otherwise you will even be prevented. But for infrastructure, such as transmission towers, steel members, communication towers, highway guardrails, railways, etc. No special tools are needed. For the above facilities, I'm afraid none of them are reliable, nor are they permanently fastened. No one can tear it down at both ends in three days.
〈 4 〉 What kind of shape and structure do you choose?
1.
The choice of shape should be "simple" rather than "complex". At first glance, it looks like a screw cap, and you can roughly know how to use and install it without looking at the instructions. You should not choose an anti-theft device with complicated structure, bulky volume and strange shape, or even an anti-theft system. Although it can also prevent theft, the complexity of cost and technology cannot form mass production, so it is not easy to popularize it.
2. What kind of anti-theft form do you choose?
It is best to choose "tightening type and back hat type". That is to say, behind the fastening nut, it is a form of sticking or backing, and it is also a powerful reinforcement for the fastening nut. Moreover, the user does not need to be equipped with a lock pad (fastening nut). This form should be "short and thin" and thin. The advantages are: the bolt design does not consider whether the length of the rod is lengthened or not, and the old line can be reassembled. After installing the thin cap, the screw can expose 3-5 buttons, which is harmonious and beautiful.
Try not to use a single hat to guard against theft.
When manufacturers recommend a single cap, in a word, you can save a nut and integrate anti-theft and fastening. The author thinks that the single cap can be used in public facilities such as fences, such as isolation fences, but it is still competent. But in the important national construction projects, safety and quality are the first, and economy is the second. The anti-theft of a single bottle cap is like a person who has several functions (fastening, anti-theft and anti-loosening). For example, the tensile strength is an important mechanical property index of the fastening nut, which is determined by the "bottom hole" of the thread, that is, the hole diameter processed before silk making. Take M 16 as an example. The standard bottom hole is ~13.8-655438+04. The nut bottom hole will increase by 0.4-0.5, reaching ￠ 14.5. But there are also several anti-theft forms, such as "ball, needle roller" and so on. The anti-theft structure is arranged on the internal thread of the nut to process the movement track (groove) of the steel ball. One or two opposite ones, whose perimeter and area account for as much as 1/2 of the internal thread surface of the nut, and do not account for the number of working cycles of the thread. In order to make the steel ball (needle) work normally in the involute groove, it is necessary to increase the bottom hole by about 0.5 mm With these gaps, it will not get stuck during installation, so that the fit gap between bolt and nut is M 16. Where M 16 is the nominal diameter, the outer diameter is actually only 15.7- 15.8, and the single side (periphery) after fitting is only about 0.5mm, which is a "tooth tip" fit of half a millimeter. It is conceivable that the tensile strength is worrying. If it is fixed on the tower, it can't bear strong tensile stress. Once it's pulled down,
4. Select the anti-theft cap with self-locking performance.
You can't use the anti-theft hat that can still stand back for a certain distance after locking, which gives the thief a "gap" in the hacksaw. The so-called self-locking is the thread self-locking between the anti-theft cap itself and the bolt. After locking, the fastening nut will not retreat and loosen, and it can be truly self-locked independently without relying on the fastening nut. It is only responsible for anti-loosening and anti-theft, and does not require the level of anti-theft nut.
←5 \8595; How to detect and remove the anti-theft cover?
"Practice is the standard to test the truth", then the anti-theft performance of the anti-theft cap can be tested through experiments. The first performance of the anti-theft cap is anti-theft (anti-unloading) and practical. It is not the kind of defense that only guards against "gentlemen" but not against "villains". The so-called "Tao is one foot high, and the devil is one foot high." The author will summarize the field and simulation test methods of anti-theft screws by engineering technical supervision and safety acceptance departments for many years:
It is best and most direct to have a venue, and it can be done on a test bench clamp or a workbench without a venue.
Method 1. Disassemble from multiple directions, use two 18 "adjustable wrench or" plum blossom "to look at the" stuck "fastening nut, remove the other wrench from the hexagon head of the bolt, and then reverse the above method once, and use the booster sleeve to forcibly withdraw from the fastening nut.
Method two. Targeted disassembly. For example, when dealing with the "twist-slip" anti-theft cap, hold the hexagon of the bolt, and use another wrench to directly retreat the fastening nut, so that the fastening nut and the anti-theft cap can retreat one or two buttons synchronously, and then screw the fastening nut forward, so that after the two caps are separated, the anti-theft cap loses its "backing" and can be removed by hand.
Method three. For "ball type (needle roller type)" and so on, the method of "one entry and two retreats" can be adopted, because the steel ball or needle roller will start to do work after rotating backward for about one turn, and then move forward, and the steel ball will return to the "origin" (groove bottom) and rotate for a certain distance. Saw the screw with a hacksaw, put the sleeve on it, shake it back and forth a few times and it will break. If you find it troublesome, use a big wrench (pipe wrench) to remove it, because the fit gap is too large, you can pull it down. Another trick is to find a magnet, preferably a ring magnet with a hole in the middle (there is a piece at the bottom of the magnetized water cup). First, push the ball or needle roller anti-theft cap to reset the steel ball to "go home", then put the magnet on the anti-theft cap like a flat washer, pay attention to the magnetic pole, and then move forward and backward at will by hand after the anti-theft cap is attracted. When there is no resistance, you can take it off easily.
Method four. For anti-theft caps such as steel sleeves, steel bowls and sheaths, you can beat the sheaths with two hammers. Pay attention to the position S opposite the nut (where the wrench is placed). The movements should be coordinated and accurate, a bit like clapping your hands. It is easy to hit the opposite side (relative plane) and can be removed directly with a wrench. If it is a round nut core, it should also be struck in this way, because the nut will shake repeatedly, which will eliminate the pre-tightening stress. Once it is loose, it can be removed with a pipe wrench with external torque. You can also use the above method to deal with the conical anti-theft cap, or you can use a chisel, punch, etc. to knock counterclockwise.
Method five. When dealing with ultra-thin polygonal or hemispherical burglar-proof cover, you can stick another burglar-proof cover of the same type (remove the ball and needle roller), and use the hook head narrow-mouth pipe wrench to ride between the two covers and remove them synchronously.
As long as you can pass the test of the above five levels, you can really be called the' protector' of the tower. However, acetylene cutting guns and cutting tools cannot be used to test disassembly because it goes beyond technical precautions. In that case, it will be more convenient to cut off the components by roots.
& lt 6 > Safety first.
Do not use anti-theft screws (anti-theft caps) that are destructive to the bolt structure (strength), and do not choose anti-theft products with unsafe factors, such as hammers, steel nails and steel needles used in aerial work such as nail shooting, riveting and inserting. These tools are easy to fall off the tower and hurt people, and steel needles are not easy to carry and easy to puncture workers' hands. In a word, construction should be safety first.