With the development of market economy, consumers are increasingly demanding the quality of steel drums. In order to reduce costs, the trend of thinning steel drums has become more and more obvious. Recently, many companies have reported that users are demanding that 200-liter steel drums be made of 0.6-0.8 mm steel materials. Therefore, many contradictions have emerged. Due to the fact that the process size has not been changed in time, the crimp quality is difficult to guarantee. Many more technical personnel of the company do not fully understand the inconsistency of the process after the material is thinned, and mistakenly believe that the size of the grooved roller wheel can be solved by changing the size of the grooved roller wheel, resulting in a waste of manpower and material resources, and the result is unsatisfactory. This article discusses the current problems in the domestic barrel making industry in order to attract attention.
First, the relationship between the sealing process and materials
How many layers can the volume be rolled? Some people think that more and more, this is true! The more crimp layers, the higher the strength and the better the sealing effect. However, is it possible to achieve a ten-layer or twenty-layer envelope? Here we do not say that there is a problem of quality costs, in fact, this can not be achieved. Even if the design of the roller groove type is better, it cannot be realized. Why?
1, steel barrels of raw material restrictions
We manufacture steel drums that require low carbon content and good plasticity. Because this processability is very good, welding, stamping, bulging are easy to ensure quality. However, the curling is not the same, because the size of the curling roller groove cannot be changed along with the curling process. The curling force is gradually transferred to the curling center through the peripheral material to roll the center. The better the plasticity of the material, the more difficult it is to transmit the force. We can imagine that if the material of steel drums is made of spring steel, the same material as watch clocks, not to mention ten layers, I am afraid it is twenty layers because it is flexible and rigid, and the force through the periphery is It is easy to reach the center. However, this is impossible because the material is so flexible that it is easy to rebound back to its original state after the roll closure is completed and the roll sealing force disappears. This is obviously not what we need. Therefore, we cannot use highly elastic materials. As far as the materials used to make steel drums around the world are concerned, the material in our country is the most rigid, so the quality is hard to guarantee. And the number of curled layers does not exceed seven. According to the study of relevant foreign experts, the number of steel drums will not exceed seven layers, and it is obvious that the roll sealing force is not transmitted so far.
2. Restrictions on the barrel sealing process
At present, the world's most advanced roll-sealing process is similar, except that the roll-roller groove type changes and the roll-sealing speed is different. This process is the most economical method of mass production, and it is also the lowest cost method. If you do not care about these, there may be a better way to make the winding force spread farther and make the curl more than seven layers. However, for the steel drum product, a good seven-layer crimp can be sufficient. If the current quality of the seal is not good, it is necessary to look for other problems.
Second, the relationship between the size of the process and the number of layers
This is actually a simple question. Many people have discussed it before. I do not want to explain it through boring theoretical calculations. We all know that if we want to roll seven layers, we must have seven layers of material. In other words, the width of the bottom edge of the barrel and the size of the flange of the barrel should be sufficient. Because the size of the material has been determined, the size of the process is insufficient, and it is impossible to roll up to seven layers. Does this mean that the bigger the process size, the better? Not! Imagine curling up to seven levels. Where do you want extra material? Either the hemming size is increased. As a result, the hemming may be up to seven layers, but the internal gap is large; or excess material is forced out of the roller wheel to cause the tongue. In short, the curling quality cannot be guaranteed. Therefore, the size of the crimping process must be determined well. Do not do more or less. This is the best.
Third, the relationship between the size of the steel barrel and the crimping process size
Here I would like to say: The size of the steel drum is not related to the size of the crimping process! Why do you want to write down this topic, because there are many business friends who think that the larger the steel bucket is, the larger the diameter of the steel bucket is, and the larger the width of the bottom end of the bucket and the flanging of the steel bucket, the more wrong it is. This is why the quality of the crimping after the drum is thin is not good! As I mentioned earlier, I will not repeat it here. I only emphasize that if you change the thickness of your material, you need to change the size of the process to get the best effect. Because a reasonable curling process size is only related to the thickness of the material!
Fourth, consider multiple factors, determine the curling method
Often things are not always desirable, and the users that the barrel makers are now encounter are strange. In fact, it is these tough users that we have developed the barrel industry. The user is our food and clothing parents. His needs are ours. Let's take our 200-liter steel drum for example. Many years ago, they were made of 1.25mm materials. However, some users now have to use 1.0mm and some have to use 0.8mm. There are still people who need 0.6mm of material to make barrels. It is not okay for the factory to eat.
But the problem came out, the material was thin, and not to mention the difficulties of the manufacturing process, it was enough to annoy the issue alone. After the material is thin, it must be rolled into seven layers. Obviously, the original process has a large size. To obtain a good quality of the seal, it is impossible to achieve a change in process size. If we say that 0.8mm steel drums are manufactured with a 1.0mm material process size, this problem is not so obvious, and sometimes it's okay to go through the process. Although the quality is not very good, it can always be done. However, some companies use the original 1.25mm process size to manufacture 0.6mm steel barrels, the contradiction is very obvious, and the problem is not solved.
In general, the barrel makers are reluctant to change the process size of the crimping, because to change the process size, it means reopening a barrel bottom mold. The flange size is easy to solve. The cost of a set of molds is considerable. If the volume is not large, nobody is willing to do it.
Judging from the actual domestic situation at present, there is only one solution, which is to change the original circular curling to flat curling. Because the material is thin, the relative size of the bottom of the barrel is large, and there must be a lot of gaps in the curl. The quality is difficult to guarantee. In order to get a really curled roll and don't want to change the mold, flattening the curl is the best way. The domestic manufacturers of 200-liter steel drums with 0.6-0.8mm are mostly changed to flat-rolled, including thin-walled tapered barrels. Of course, this is only an expedient measure. If the output of thin-walled barrels is large enough (this is the direction of development), opening a barrel bottom lid mold should be the best choice.
This is like saying that I am teaching others how to make up for or fool people. In fact, people in the barrel industry know that sometimes there is no way to do something. It is also a good idea to have a stupid way to level things out. For most SMEs, the complexity of the product category is beyond our expectation. In order to occupy the poor market and win a bowl of rice, what kinds of buckets are willing to do, then there are more contradictions. Several domestic large barrel-making plants have long been working on a single product and are not willing to do miscellaneous barrels. Those small and medium-sized enterprises that fill the market in the market have become miscellaneous and supporting roles in the barrel making industry.
However, no matter how you do it, your mind must be clear. Often, SMEs can train their technical talents because they have too many problems. I deeply appreciate this. Therefore, after many technicians of the company changed the material thickness of the steel drum, they did not realize that the size of the steel was not suitable. They also simply looked for problems in other aspects. This was the point where they did not seize the contradictions, and eventually they had to Less than ideal results.
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1).24G radar sensor:
Brand: Hofic
Technology: Microwave processor
Maintain time: 0.5s
Protection: IP54
Transmitting frequency: 24.125GHz
Maximum installation height: <5meter
Transmitting power density: <5mw/cm2
Power consumption: <1W(VA)
Installation angle: 0-90°(lengthways) -30-30°(crosswise)
Supply voltage: AC&DC 12V-30V
2).Photocell:
Approval CE & ISO9001
Power supply AC/DC 12-30V
Static current 25A
Action current 40mA
Mounting distance Max 10m
NO or NC contact Done by NO./NC. contact selection
Working environment temperature -42℃ to +45℃
Working environment humidity 10 to 90%RH
Appearance dimensions( controller) 123*50*32mm(L*W*H)
Appearance dimensions(Magic eye head) 19*13mm(L*D)
3). Remote control
Operating Voltage: AC220V/50HZ+-20%
Transmit power:≤100mW;Super regenerative module, strong anti-interference
Operating temperature:-30℃-+70℃
Working frequency: 433MHZ;transmitter 1527, millions of encoding chip
Accept sensitivity:≤110dB
Manipulation method: electric remote control
Configure the quantity: Wireless number; factory configuration transmitter two. Can be equipped with PT2272 digital decoder chip
Configure the function: Up, down, stop, anti-lock full-featured reproduction
4). Magnetic loop
Voltage: 12V AC/DC +-10% 24V 115V AC+-10% 230V
Power: <2VA
Continued electrical output: 7A / 250V AC
Frequency range: 20 to 200K Hz
Response time: infinity (factory setting) or adjust maintain time
Sensitivity: 0.01% to 0.1% divided into 3 levels
Protection level: IP30
Electromagnetic compatibility (EMC) Complies with EM50081-1 and EN50082-2
Detection loop inductance: the limit of 40uH to 100uH ideal value 80uH to 300uH
Operating temperature: -25 ℃ to 70 ℃
Storage temperature: -40 ℃ to 85 ℃
Relative humidity: <90% non-condensing
Temperature compensation: automatic compensation up to 50 ℃ / h
Connection type: 11 pin DIN rail socket
Dimensions: 41 * 78 * 85 mm (width * height * length)
Weight: 250 grams
5). manual push button
This exit switch button is made of ABS and has built-in indicator light make it looks more elegant and fashionbale. It can be widely used in public entrance gates, public door, home, office, hotel, etc.
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Main Feature
Fashionable appearance
Made of ABS Plastic
Easy to install and operate
Used for access control
Specification
Mechanical Life: 500,000 test
Material: Plastic
6). Limit switch encoder
Voltage: DC5V-24V
Output voltage: high voltage≥85%Vcc, low voltage≤0.5V
Maximum mechanical speed:6000rpm
Anti-vibration: 50m/s,10-200HZ,XYZeach way 2 times.
Current consumption:≤30mA
Response frequency: 0-100KHZ
Protection: waterproof,oil proof,dust prevention, IP54
The output code system: binary code
Operating life: MTBF≥30000(+25℃,2000rpm)
Rotational inertia:4.0x10-8kgm²
Maximum load:radial direction20N
Axial direction:10N
Weight: about 0.4kg
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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.highspeedshutterdoor.com