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Note: 1.8 yuan is the price of the small wood block, not the total price.

Product Name: KX1916 Hand-crank Crane (Lifting Machine)
Product Code: KX1916
Size: 270*70*230mm
Weight: About 100g
Material: plastic parts + belt wheel + screws + wire ties + wire....
Color: Red and Yellow Mix
Battery Required: No
Packing: 200pcs
Box Specification: 600*450*550mm

The ancient Greeks classified the pulley as a simple machine. As early as 400 BC, the Greeks knew how to use the compound pulley. Around 330 BC, Aristotle discussed the "compound pulley" system in his work "Mechanics" in the 18th question. Archimedes contributed a lot of knowledge about simple machines and explained the kinematic theory of the pulley in detail. It is said that Archimedes once alone used a compound pulley to pull a sea ship full of goods and passengers. In the first century AD, Hero of Alexandria analyzed and wrote about the theory of the compound pulley, proving that the ratio of the load to the applied force is equal to the number of rope segments bearing the load, that is, the "pulley principle."

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Experimental Objective: 1. To gain a preliminary understanding of mechanics and mechanical principles.
2.
Know the application of crane in daily life.

3. Understanding the structure of a pulley can help distinguish between a fixed pulley and a moving pulley.

Science Project:

1. Recognize and prepare the necessary materials for the experiment.
Step 2: Install according to the instructions in the manual.
3, Install and debugging.

Scientific Principles:

Pulley system: A device composed of a fixed pulley and a moving pulley. It is both efficient and can change the direction of the force. However, it cannot save work because the pulley system saves force but consumes distance. In order to save both energy and change the direction of the force, the fixed pulley and the moving pulley can be combined into a pulley system.
A pulley system is composed of several fixed pulleys and movable pulleys, which can achieve the purpose of both saving effort and changing the direction of force. In use, how much effort is saved and how the ropes are wound depend on the effectiveness of the pulley system.
Features: A pulley system uses several sections of rope to lift an object, and the force required to lift the object is the weight of the object multiplied by the number of sections of rope. If the free end of the rope goes around a moving pulley, it counts as one section, but if it goes around a stationary pulley, it does not count. Although using a pulley system saves effort, it increases the distance traveled, with the distance traveled by the driving force being greater than the distance traveled by the weight. The amount of distance traveled mainly depends on the number of sections of rope around the stationary pulley. With a pulley system experiment, it is easy to see that although using a pulley system saves effort, it increases the distance traveled—the distance traveled by the driving force is greater than the distance traveled by the weight.

Knowledge Treasure:

A pulley is a simple machine used to lift heavy objects and save effort. A pulley is a small wheel with a groove around it that can rotate around an axis. A simple machine composed of a disc with grooves that can rotate around a central axis and a flexible rope (such as a rope, tape, cable, or chain) that crosses over the disc and can rotate around the central axis is called a pulley.

Science Expansion:

In mechanics, a typical pulley is a disc that can rotate around a central axis. The surface of the disc has a groove, and the rope is wound around the groove. If you pull on either end of the rope, the friction between the rope and the disc will cause the pulley to rotate around the central axis. A pulley is actually a deformed and rotatable lever. The main function of a pulley is to pull loads, change the direction of force, and transmit power, etc. A mechanical device composed of multiple pulleys is called a pulley system or a compound pulley. The mechanical advantage of a pulley system is large, allowing it to pull heavier loads. A pulley can also be a component of a chain drive or belt drive, transmitting power from one rotating shaft to another. According to whether the center axis of the pulley moves, a pulley can be divided into a fixed pulley and a moving pulley; the center axis of the fixed pulley is fixed and the center axis of the moving pulley can move, each has its advantages and disadvantages. By assembling a fixed pulley and a moving pulley together, a pulley system can be formed. A pulley system not only saves effort but also can change the direction of force.

 The following is the installation detailed diagram.

Zhejiang Jianyi Education Technology Co., Ltd.
Zhejiang Jianyi Education Technology Co., Ltd. (formerly Yifei Toy Factory)Established in 2007, the current brand is "XING TEACHER" and "JIAN YI". Over the past 10 years, our company has made unremitting efforts to make the enterprise gradually mature. Our company is a member of the Teaching Equipment Industry Association of the Ministry of Education, and is a leading enterprise in Zhejiang Province. The company has been awarded the "Heavy Contract and Credit-Keeping" unit for three consecutive years by Jinhua City. In 2014, it was awarded the "Advanced Collective of Jinhua Teaching Instrument Industry" by Zhejiang Province.
Zhejiang Jianyi Education Technology Co., Ltd. is a high-tech enterprise that integrates modern scientific research and development of educational equipment, curriculum design, teaching resource integration, and technical services. Zhejiang Jianyi Education Technology Co., Ltd., with high-tech products and modern educational equipment, has established itself in the education industry. Our products are sold all over the country and have been exported to Europe, America, Japan, and South Korea. After years of accumulation, the company has begun to take shape. In terms of technological innovation, the company has professional design personnel engaged in the research and development of complete sets of educational products and the upgrade of existing products; in production, management, and installation services, the company strictly implements the ISO9001 international quality assurance system standards; in marketing, the "Xing Teacher" products have been introduced into many provinces and cities in the country and enjoy a good reputation; for many years, it has provided high-quality, advanced, professional series of modern teaching equipment and professional equipment research and development custom services for the education industry. With excellent, high-quality professionals and perfect after-sales service quality, the company has established a good corporate image.Xing teacher's" series of science and education physics, chemistry, photovoltaic, wind energy, geography, biology, art, and so on, has successfully won bids in the education bureau tenders multiple times. Zhejiang Jianyi Education Technology Co., Ltd. continues to adhere to the business philosophy of "quality first, service to diligence, honesty in character," and upholds the "Xing teacher" culture, casts the "Xing teacher" brand, and creates the development policy of the "Xing teacher" career. We provide excellent equipment and high-quality services for school teaching and scientific research. We are willing to cooperate sincerely with new and old friends at home and abroad, work together, and devote our efforts to education and education.

  Before assembling, please check if the circuit is unblocked and all the components are complete. Ensure that all contact points are in good contact. During the assembly process, be careful not to get glue on your clothes or skin. Keep the parts out of reach of younger siblings to prevent them from swallowing them by mistake! Do not play with them on your head, to avoid the model falling and injuring you!