The 376th session of Lingao Qiming examines the weight of the pose
The poor fit makes the pin produce a "clatter-crash-" sound when it moves with the pallet fork. [Full text reading] ∑fé This is not the main problem, because after all, this is a test product.
Veterans 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 in terms of materials and processing. With their suggestions, Dr. Zhong redesigned and improved some of the components, which improved the reliability of the overall operation.
In order to keep the pendulum secret, the wooden platform was tightly covered with wooden boards on all sides. In the hot and rainy Lingao, the environment inside is like a steamer.
This time, Zhong Lishi did not use the Mongolian strongman Bart as the driving force. Instead, he designed a windlass on the ratchet shaft, with a sack of sand hanging underneath. Use sandbags as weights for power. Bart's duty is to carry several 25-kilogram sandbags up to 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 more and more power from the ratchet is transmitted to the pendulum, the pendulum's swing gradually increases until it maintains a stable angle, driving the pallet fork to work rhythmically. The ratchet rotates step by step with the swing of the pendulum.
This simple wooden prototype marked 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 successfully operating No. 3 test facility, Zhong Lishi thought of Galileo, who discovered the law of pendulum motion, and couldn't help but shed tears. At this moment, the old man Galileo should be suffering persecution from the Holy See and is in dire straits. When Zhong Lishi walked out of the hot water test tower, it was as if he had just emerged from the water. People did not notice that he was crying. Only when Zhong Xiaoying delivered dinner to his father, did they notice that he was depressed and unhappy.
"Father is here..." Zhong Xiaoying put her hand on Dr. Zhong's shoulder, "You are unhappy..."
"Hmm...I'm thinking about 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. Let his mood improve.
Based on the No. 3 test device, Zhonglishi 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. More sandbags and a hammering mechanism with a non-return ratchet were also added. In this way, a usable No. 4 test device was born.
Based on the No. 4 test device, Zhong Lishi designed and trial-produced a complete set of bell machines for bell towers. The clock machine is made of bronze material to ensure performance. Some elastic components are made of phosphor bronze. Since this is a trial product, all the parts are processed individually by the veterans of the Science and Technology Department themselves, 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 belfry clock machine has been unique, and each one has slightly different improvements.
While making the clock machine, Lingao Construction Company built an experimental bell tower with a brick arch structure that is very well shielded and ventilated for this set of clock machines. The clock tower is located on the west side of Taibaiyao Observatory and was the location of the later clock workshop.
Zhong Lishi personally presided over the installation. This set of clock machines is named the yzb-1 clock machine, also known as the "weight-testing pendulum type one". The "weight-testing pendulum type" clock machine only has a chronograph function, and only has minute and hour hands. In order to improve the stability of operation, 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 mechanism due to eccentricity.
Three sets of "Examination of Weight Pendulum" were built successively, each with some modifications. The situation of large clock machines and watches is different, so Zhonglishi has made some attempts to design different watches. In the power part, he installed the powered driving wheels in different positions of the transmission group and compared the advantages and disadvantages of these installation methods. In terms of the pallet fork, the pallets and ratchets of the pallet fork are the parts with the most frequent friction. The escapement fork of the watch is made of ruby, which is more wear-resistant than the ratchet, because it is more convenient to replace the ratchet than the fork. For large clock machines, the fork tiles are large and easy to replace, while the large ratchet is very expensive. Therefore, Zhonglishi tried to use a material slightly softer than the bronze ratchet to make replaceable fork tiles on the bell tower clock machine to protect the more expensive ratchet.
The power of the "Weight Inspection Pendulum Type 1" is four sets of weight hammers, which are lifted separately through the upper hammer wheels driven by four iron chains. The purpose of using multiple weights is to alleviate the change in the torque of the upper hammer clock machine and reduce the impact of the upper hammer on the travel precision. 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 raising the hammer. The driving wheel has a non-return ratchet similar to that of the rear wheel of a bicycle, which can only rotate the upper hammer counterclockwise in one direction (the rotation direction of the weight wheel is clockwise. The power of large clock machines is relatively strong. When inspecting the clock machine, All the weights need to be released to ensure the safety of maintenance personnel. In order to prevent the weights from accidentally falling, they cannot stay under the weights, just like "you cannot stand under the boom".
The three "weight-testing 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. For teaching and display purposes. However, the Planning Institute believed that since they had been built, it would be too wasteful to abandon them: just producing these three clocks consumed a lot of working time of veteran technicians. So two of them were officially installed in the vacant bell tower. "Examination of Weight Pendulum Type" has only one side of the clock face and no lighting. Later, it was modified and a night lighting system was added.
Facts have proved that the bronze bell machine has a long life. Although there are some minor problems, it has been running normally with good maintenance. After 30 years of continuous operation, these three "weight-testing pendulum" clock machines were replaced. As the ancestors of the Australian and Song Dynasty watch industry, they have become the treasures 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 sound once. This kind of clock machine that can barely tell the time is called the "Second Weight Pendulum Type".
The "Type 2 Verification Weight Pendulum" has just been installed on the experimental bell 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 on the hour?" Zhong Lishi looked at a clock in the studio. This clock looks very much in the style of this time and space: porcelain clock face, wooden clock case, and brass hands. It is 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.
A wire suddenly pulled out from behind the clock and was connected to a wooden box. Inside the wooden box is the "Zhong's No. 1" battery invented by Dr. Zhong. Lingao does not have a thousand batteries, so it can only use an external battery to power the quartz clock.
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