Three hundred and seventy-sixth test weight pendulum
The poor matching accuracy caused the pin to produce a "clatter-crack-" sound when it moved with the pallet fork. This is not the main problem, because after all, this is a test product.
Seniors serving in the Ministry of Science and Technology came to visit this original pendulum system one after another and put forward their own suggestions for improvement, especially regarding materials and processing. With their suggestions, Dr. Zhong redesigned and improved some of its components.
, which improves the reliability of the overall operation.
In order to keep the secret of the pendulum, the wooden platform was tightly covered with wooden boards all around. In the hot and rainy Lingao, the environment inside was like a steamer.
This time, Zhong Lishi did not use Bart, the Mongolian strongman, as the driving force. Instead, he designed a pulley on the ratchet shaft, with a sack of sand hanging underneath. The sand bag was used as a weight for the driving force. Bart's responsibility was to lift several 25 kg
The heavy sandbag was carried up the 10-meter-high bell tower. When Zhong Lishi put down the sandbag, the escapement fork was hit by the ratchet, and the tail lost balance and slowly swung, triggering the first escapement pass action. As the ratchet
More and more power is transmitted to the pendulum, and the swing amplitude of the pendulum gradually increases until it maintains a stable angle, driving the pallet fork to work rhythmically. The ratchet rotates step by step along with the swing of the pendulum.
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This simple wooden prototype marks the beginning of Lingao's watch business. It uses the pendulum speed regulator invented in 1656 and the free escapement invented in 1765. Looking at the successful operation of the No. 3 test mechanism, the clock
Lishi thought of Galileo who discovered the law of motion of the pendulum and couldn't help but shed tears. At this moment, the old man Galileo was probably being persecuted by the Holy See and was in dire straits. When Zhong Lishi walked out of the dire straits of the test tower
When he came out, it was as if he had just come out of the water. People did not notice that he was crying. Only when Zhong Xiaoying brought dinner to his father did they notice that he was depressed and unhappy.
"Father..." Zhong Xiaoying put her hand on Dr. Zhong's shoulder, "You are unhappy..."
"Well...I'm thinking of someone..."
"It's a senior...sir..." Dr. Zhong said and couldn't help but hold his adopted daughter's hand - it was soft and warm, which made him feel better.
Based on the No. 3 test device, Zhong Lishi installed a set of gears to realize the relationship between the minute hand and the hour hand, redesigned the length of the pendulum and calibrated its period. At the same time, more sandbags and belts were added
There is an upper hammer device with an anti-reverse ratchet. In this way, a usable No. 4 test device was born.
On the basis of the No. 4 test device, Zhong Lishi designed and trial-produced a complete bell tower clock machine. The clock machine is made of bronze material to ensure performance. Some elastic components are made of phosphor bronze. Since this is a trial
Products, all parts are processed individually by the veterans of the Ministry of Science and Technology, and some are taken to the mechanical processing factory to ask professional veterans to do it. Of course, there is no concept of tolerance control - for a long time, each bell tower clock machine
Each unit is unique, and each one has slightly different improvements.
While manufacturing the clock machine, Lingao Construction Company built an experimental clock tower with a brick arch structure for this set of clock machines, which has excellent shelter and ventilation. The clock tower is located on the west side of the Taipei Observatory. It was the location of the later clock workshop.
Zhong Lishi personally presided over the installation. This clock movement is named yzb-1 type clock movement, also called "weight-checking pendulum type one". The "weight-checking pendulum type one" clock movement only has a timing function, and only minute and hour hands. In order to improve
For operational stability, there is a counterweight at the end of the hands to ensure that the axis of rotation of the hands is the center of gravity. In this way, when the hands rotate on the side facade of the clock tower, they will not affect the clock machine due to eccentricity.
Three "test weight pendulum" models were built successively, each with some modifications. The situations of large clock machines and watches are different, so Zhonglishi made some attempts that were different from watch designs. In the power part, he
Install the powered driving wheel in different positions of the transmission group and compare the advantages and disadvantages of these installation methods. In terms of the pallet fork, the fork and ratchet of the pallet fork are the parts with the most frequent friction. The pallet fork of the watch
The fork shoe is made of rubies that are more wear-resistant than the ratchet, because it is more convenient to replace the ratchet than the fork shoe. For large clock machines, the fork shoe is large and easy to replace, while the large ratchet is very expensive. Therefore, Zhonglishi is
On the bell tower's clock machine, an attempt was made to use a material slightly softer than the bronze ratchet to make replaceable forks to protect the more expensive ratchet.
The power of the "Weight Inspection Pendulum Type 1" is four sets of weight hammers, which are driven by four iron chains to lift the hammers respectively. The purpose of using multiple weight hammers is to alleviate the change of the torque of the hammer clock machine and reduce the impact of the hammer on the clock.
The impact on travel time accuracy. The diameter of the upper hammer wheel is twice that of the driving wheel of the heavy hammer. This design is to save effort when lifting the hammer. The driving wheel has a non-return ratchet similar to the rear wheel of a bicycle, which can only rotate the upper hammer in one direction counterclockwise.
(The rotation direction of the weight wheel is clockwise). The power of the large clock machine is relatively strong. When inspecting the clock machine, all the weights need to be released to ensure the safety of the maintenance personnel. In order to prevent the weight from accidentally falling,
You cannot stay under the heavy hammer, just like "no one can stand under the crane arm".
Three "test weight pendulum type" clock machines were officially put into use after a month of testing. Originally, Dr. Zhong did not intend to let this experimental product enter the practical stage, and only planned to keep one installed on the test clock tower.
It was used for teaching and display. However, the Planning Institute believed that since it had been built, it would be too wasteful to discard it: just producing these three clock machines consumed a lot of working time of veteran technicians. So two of them were officially installed in the vacant clock tower.
Here, the "Examination of Weight Pendulum Type" has only one side of the clock face and no lighting. It was later modified and a night lighting system was added.
Facts have proved that the bronze clock machine has a long life. Although there are some minor problems, it has been running normally under good maintenance. After 30 years of continuous operation, these three "weight-testing pendulum type" clock machines were replaced as
The ancestor of the watch industry in Australia and Song Dynasty has become the treasure of the museum.
Zhong Lishi made some major modifications on the fourth clock machine: he designed two synchronized clock faces for the clock machine, and designed a simple hourly hammer device to ring a copper bell at the hour
.This simple time-telling device can only emit one sound. This kind of clock machine that can barely tell the time is called the "Second Weight-testing Pendulum".
The "Type 2 Vertical Weight Pendulum" has just been installed on the experimental clock tower and is being tested. However, Dr. Zhong is not satisfied with this clock machine and just wants to verify whether his idea is feasible.
"Does the clock ring every hour?" Zhong Lishi looked at a clock in the studio. This clock looked very much in the style of this time and space: a porcelain clock face, a wooden clock
The case and brass hands are indeed assembled by the clock workshop of the Ministry of Science and Technology. But inside is a quartz movement produced in another time and space.
Wires were suddenly pulled out from the back of the clock and connected to a wooden box. Inside the wooden box was the "Zhong's No. 1" battery invented by Dr. Zhong. Lingao did not have dry batteries, so the quartz clock could only be powered by an external battery.
Quartz watches were synonymous with cheap goods in the old days. The retail price of ordinary finished watches was only a few tens of yuan. However, in terms of accuracy, they beat all mechanical watches. The Senate had purchased a large number of timing equipment before D-Day. In addition to finished watches,
In addition, there are a large number of spare parts. A large part of them are the quartz clock movement and quartz oscillator. The outer casing is manufactured in this time and space to fully save space on the ship.
These locally assembled quartz clocks are distributed in some important workshops that need to accurately control time. As controlled materials, each quartz clock has a number, and no one except the elders and authorized employees of the Ministry of Science and Technology is allowed to touch it.
The reason why Zhongli Time attaches so much importance to quartz clocks is because quartz clocks are the most accurate timepieces they have. A timing system requires an accurate calibrated clock as a benchmark. He originally suggested purchasing a large number of quartz oscillators and prepared to use them to make this book.
The space-time reference calibration device uses the semiconductor components brought as amplifiers before the electronic components fail.
Dr. Chung’s plan is to use the quartz calibrating device as a master to manufacture a batch of high-precision mechanical calibrating devices. Locally made clocks are calibrated using mechanical calibrating devices. This graded calibrating system is essential for maintaining the accuracy of timekeeping.
Timeliness plays a vital role. In the old days, radio timing of broadcast stations was the main method of time adjustment. It is not yet possible to popularize this system in Lingao, so a calibration device must be used.
"Yes, my daughter listened to it every time on the hour, and she rang it every time." Zhong Xiaoying said respectfully and presented a file folder, which accurately recorded the exact time of each ringing.
Zhong Lishi took a look and found that each time the bell sounded was slightly later than the time displayed by the quartz clock, some were even delayed by as much as a second or two. This was not just a matter of the speed of sound waves - he had tested it after installing the clock machine.
However, the travel time error is not that big. Apparently there are still some problems with the mechanical transmission of the bell.
"There is still a problem with the transmission." Dr. Zhong whispered and put down the clamp. He looked at the rain outside and saw that there seemed to be no sign of weakening. It seems that the inspection of the clock machine will have to be done tomorrow.
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He wrote on his note board: There is a roof eaves between the studio and the experimental bell tower.
It is now eleven o'clock, and Zhong Lishi is going to go to the Astronomical Observatory to calibrate the time at zero o'clock. There is still a little time, Dr. Zhong looked at a lot of parts and drawings on his desk, and decided to first calibrate the mechanical calibrator.