industrial maniac

Chapter 101 Road Repair Diaphragm and Sound Cone

Huangnigang in winter looks like an ink painting under the setting sun.

An old lady with a scarf on her head standing guard in front of the fruit stand.

The old man squatting next to him smoking a pipe.

A middle-aged man with oily hands repairing bicycles.

It is said to be repaired every year, but the broken roads are repaired every year.

Xu Fei and Da Ma went to Loujiazhuang on foot, and when they left the east gate, they saw two four-wheeled carts with buckets a long way away.

One was pulling gravel, and the other was carrying a huge iron pot.

Coal was burning under the pot, and asphalt was boiling in the pot.

Beside him was a man wrapped in airtight clothes, who occasionally lifted the blower to make the coals burn more vigorously, and occasionally picked up the iron rod to keep stirring in the pot.

After a while, I picked up a dustpan of gravel and poured it into the pot, and then used a shovel to stir fry continuously.

And there are four or five men in the distance, cleaning up the potholes on the road, tamping them manually, and then paving the gravel covered with asphalt, spreading it with a trowel, and then pouring a layer of asphalt liquid. It's like repairing a road.

The surrounding air is pungent and hot, and passers-by stay away from it.

To be exact, the stuff boiled in the pot should be called coal tar pitch, which is toxic and carcinogenic, and is a product of 'coal coking'.

Coal cannot be used for steelmaking, it must be dry-distilled at high temperature in a sealed environment, and processed into 'coke', and in this process, a large amount of coal tar will be obtained, after the light components of coal tar are extracted, the remaining residue is coal tar pitch .

Coal tar pitch is hard in winter and soft in summer. The surface of the road repaired with it is smooth, but it will be sticky in high temperature weather, commonly known as asphalt road.

In the past, China could not produce good steel and had to import steel.

Later, good steel was produced, and the price of steel fell sharply, but the price of "coke" used for steelmaking increased sharply.

When Huaxia masters the 'coking of coal' technology, the price of coke will be greatly reduced, but the price of bituminous coal will be greatly increased.

As a result, Huaxia's steel and coke production accounted for 80% of the world, or even higher, and successfully became the largest exporter of steel and coking coal, but it also caused serious environmental pollution.

At the beginning of the new century, "steel" and "coke" were at their cheapest, and among the by-products, relatively inferior coal tar pitch became the main raw material for road construction.

There are also two kinds of asphalt, called petroleum asphalt and natural asphalt, which are not too toxic. They are used to build roads and are called: asphalt roads.

It’s just that the times are moving forward, but many old habits cannot be changed. People still call roads asphalt roads.

Mr. Xu got lung cancer, Xu Fei searched for the cause, thought about the cancer caused by cigarettes, and also thought about 'coal tar pitch'.

At that time, many buildings in the fan factory were old and almost all leaked. Mr. Xu brought a batch of coal tar pitch and melted it to repair the roof.

As for whether it was caused by this thing, Xu Fei still couldn't figure it out, but he felt very uncomfortable when he smelled the pungent smell.

"This broken road, tinkering with it, tinkering with it, it is better to renovate the whole road."

Da Ma, who followed behind, responded: "Before Director Shang became the leader of the county, the operation center talked to the previous one."

"How to say?"

"The county finance can't even pay wages. How can there be money to build roads? The other party discussed with the city and planned to borrow money for repairs. The debt ratio of Danzig City has exceeded 90%, and other banks dare not approve it at all."

"Can't the city compound get a loan? Before, Liu Sixi, the head of the township, went to the credit union and sent the money over the next day."

"Can it be the same? You ask Huangnigang Credit Union to try with [-] million yuan?"

"..."

"Large banks didn't dare to give it to us. Later, the previous county leader thought of a compromise. He borrowed money from our company and mortgaged the road to us for about 20 years."

"Why, do you want us to collect tolls?"

"Otherwise, how do you get your money back?"

"I just finished scolding the toll booth, now let me scold myself?"

"Anyway, this is the solution now."

"How much money do we have now?"

"Last month, 1200 million sets of Mechanical Three Kingdoms were shipped out of the warehouse. Including traditional tin toys, the total sales were 1.2 million. Selling dogs earned 0.1 million, selling tracks and chassis earned 0.31 million, excluding the 1.1 million payment for steel purchases, and excluding leasing. The 0.2 million yuan of Daze Power Land, excluding the 0.1 million yuan lent to your father, excluding salary, electricity, packaging fees, transportation fees, and the cost of registering many leather bag companies, on the whole, equal income and equal output."

"I've been busy for nearly two months and haven't made any money?"

"No, we got a Daze power plant with a total investment of 5 million red notes, a thermal power plant with a total investment of 0.5 million yuan, and a Daze toy factory with a total investment of 2 million yuan. In addition, your salary account still has tax balances. 260 million wages, 0.2 million untaxed rent."

Xu Fei counted with his fingers, "How many offshore accounts are there?"

"Six light tanks, plus a bunch of disassembled parts, and the remaining funds, totaling 6 million US dollars. However, the Tower Company's accounts have been settled. In addition to the 0.8 million funds, there is still a 0.3 million US dollar loan that is about to expire."

Da Ma opened the portable file bag, took out a notepad and calculated, "In general, there are only 0.1 million US dollars available at present, but it is not a problem for us to borrow 5 million red notes."

"Is it approved by others?"

"Definitely approve. Recently, construction, agriculture, ICBC, and investment promotion have all asked us for loans, saying how much we want, and they will lend as much. Especially the Bank of Communications gave a [-]% discount rate when they heard about road construction."

"I remember that the interest rate over five years is 6.21%. If you borrow 5 million yuan, the 10-year interest will be nearly 2 million yuan, the 20-year interest will be nearly 4 million yuan, and the 30-year interest rate will be 6.5 million yuan. .”

"Then shall we build the road?"

"Repair, but not the one leading to Gucheng County, only the part where Huangnigang connects the upper and lower entrances of the expressway, the two-way six-lane, with flower beds in the middle, greenery and sidewalks on both sides."

"It's easy to talk about the project, and you can find Dongshan Development and Reform to get it done, but to open the way, you need to acquire land and compensate the houses."

"Let Lao Xu build a few buildings in Daze, hand them over to the real estate company of the supply and marketing cooperative, and then calculate the value to compensate the demolished households. In addition, tell the demolished households that whoever agrees first will enter the toy factory, two per household."

"That's a good idea."

"How much do you need to invest?"

"The length is at most five kilometers, which is 5000 meters. Two-way six-lane, standard 3.75 meters, our width is a little wider, a total of 24 meters, plus 4 meters of sidewalks, 2 meters of flower beds, roadbed at least 35 meters... 35x5000, our quality requirements A little higher, the cost of a single square meter is 120, and it needs about 2100 million red notes."

"Voted!"

"I'll talk to Liu Sixi tomorrow."

"By the way, transfer the 0.1 million US dollars in the offshore account."

"Your personal account has 2000 million."

"No, you tell Lao Shang, the leader of the county university, to move the county courtyard here, and I will give him 1000 million US dollars in foreign exchange every month. If one day is in a good mood, it will not be a problem to get 1 million US dollars."

"Then he will definitely not hesitate."

While chatting, I came to Loujiazhuang.

Xu Fei and Lou Nannan are old classmates. Although they have never been to the house, they know each other well.

It wasn't until he walked into the alley that he called Lou Xiaohu.

Then the three of them stepped into the yard together.

Lou Xiaohu's parents invited two helpers to prepare more than 20 dishes, using large and small pots, frying and stewing, including vegetables and soup, plus a few cooked foods.

In the countryside, it is definitely a big seat.

After exchanging greetings, everyone, including Da Ma and the kitchen helper, were seated.

Lou Nannan went to work at the Yun County Supply and Marketing Cooperative. Today, Friday, she rushed back after get off work, at least eight o'clock in the evening.

The rest of the people, except for Da Ma and Lou Xiaohu, although they are not familiar with each other, but the two help cooks, one is Xu Feiyu's red class teacher, the other is a junior high school physics teacher, and Lou's father and Lou's mother also teach, so there was no discussion during the dinner. Missing topics.

After chatting, they quickly ignored Lou Xiaohu.

The latter was a little anxious, and stood up with a glass of wine, "Director, I respect you."

"You are welcome, sit down!"

Xu Fei picked up the teacup, and after signaling, he took a breath, and turned to look at Father Lou, who taught music, "Uncle, tell me about the difference in tone color caused by the material of this diaphragm."

"To put it simply, the small handmade speaker you made cannot emit tweeters. I suggest changing the diaphragm to a 'silk film', or a hard plastic film. If you use a silk film, use an aluminum bracket, and then adjust the structure of the rear cavity. The sound should be more natural, the high-frequency response is clearer and more delicate, and the overall sound is more transparent. If a hard ultra-thin plastic film is used, because of its strong rigidity, the tweeter should be brighter. Combined with the plastic bracket, the overall sound should be relatively' Bright'."

"Where's the sound cone?"

"This one is more complicated. Paper ones have a combination of rigidity and flexibility, high internal damping, low cost, natural sound quality, thick and full bass, but poor moisture resistance. Ceramic ones are not only good for the interpretation of human voice and classical music. It is very delicate, full and powerful in the mid-bass, and has good dynamic performance and precise sound field positioning. It is suitable for expressing infectious and shocking music. There are also bulletproof cloth, that is, woven basins, plastic basins... In short, the vibration drives the sound basin , forcing the air to vibrate, thus making sound, which material is used will produce the corresponding effect.”

Xu Fei was thoughtful, "So, the bracket must be made of strong anti-resonance material to keep the fidelity."

"It can be said that, but if you want a speaker to produce a variety of sound effects, you still need to use a circuit board to control the current signal, but it is not as complicated as you think."

The physics teacher who was watching said, "I've done some research on this, you can visit me when you have time."

"Your home?"

"No, I have a shop by the side of the road. After get off work every day, I help people fix TVs and radios, and teach physics myself. I used to be an electrician, and I usually messed around, so I made some circuit diagrams."

"That's a good relationship. If you need it, the copyright fee will definitely be indispensable."

"Hey, foreign technology is much better than ours. My little things may have been ruined overseas. If you can use them, I will be happy without paying."

"Let's talk about it when the time comes, come, come, uncle, let's do it!"

Xu Fei drank a cup of tea and suddenly thought of the "Wu Shuang Version of Mechanical Three Kingdoms" that was being developed. He looked up at the calendar on the wall. It was one day less before the Spring Festival, and Lou's father and physics teacher both knew about speakers, and the latter also knew about motors. , a little embarrassed, said: "I can't wait to try it. Coincidentally, Lou Nannan hasn't come back yet. Why don't we go to my office for a stroll and come back and continue drinking?"

Father Lou and the physics teacher nodded happily, and put on their clothes, "Then let's go back quickly."

Lou Xiaohu hesitated, "Should I go?"

"Do you understand?" x3
(End of this chapter)