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Since last October, Hangzhou Tooth has released the first set of five-leaf adjustable propellers with the most difficult design and the highest technical content. In February this year, two sets of the same specifications were sold overseas. At this point, Hangzhou Tooth has provided a main propulsion system including a gear box and a propeller for a certain national navy frigate with its solid strength, and has become a veritable world-class advanced level rapid ship main propulsion system integration packaging supplier.
Since the establishment of the factory, Hangzhou Tooth has experienced half a century of tempering in the field of ship transmission, and has accumulated rich experience in design and manufacturing. It has the honor of China famous brand “Forward†brand gear box for ships, shipyards, and shipowners. Learn deep and thorough. Since entering the new century, Hangzhou Tooth actively accepts the market challenge, and at the same time manufactures traditional products, it also undertakes the integration and packaging responsibility of all equipments including propeller, shafting, gearbox, high-elastic, hydraulic and remote control operating systems. The project even packaged the mainframe, breaking the domestic dependence on imports. In 2006, Hangzhou Tooth and the internationally renowned marine company Mason reached an agreement to establish a joint venture company, Hangzhou Advance Mason Ship Transmission Co., Ltd., which covers the marine transmission products and adjustable paddles (CCP) of Mason, France. And through the high salary to hire foreign experts, Hangzhou Tooth's technical team has made many improvements and upgrades in the design of adjustable paddles, and made unremitting efforts in the field of product development and development, and upgraded the ship propulsion technology to a new one. The level and realm of the product, the product successfully entered the military propulsion system, that is, the naval battleship (the ship is a double-machine twin-propeller propulsion, the total design power exceeds 10,000 kW, and the speed requirement is greater than 25 knots). At present, Hangzhou Tooth can provide a total solution including high-elasticity, gearbox, shafting, propeller, hydraulic control, etc. The products are widely used in the domestic civil ship market and also exported to South Korea, Singapore, Indonesia, Myanmar. Countries such as the Netherlands and Turkey.
In addition to being light in weight and fast in speed, naval combat ships have special working conditions, such as quantitative draught restrictions. When performing patrol tasks, the propeller must keep low noise and maintain high speed when chasing high speed. Therefore, the ship's propulsion system has very strict requirements, requiring the gear box to be light in weight, small in size, high in precision, requiring a small diameter of the propeller, low noise, and high efficiency. All of these have determined that the design and manufacture of transmissions for military vessels must be highly technically difficult, and only the most experienced ship propulsion system manufacturers can be tasked with them.
The GCH700 gearbox produced by Hangzhou Tooth has a lightweight design and is light in weight and compact in structure. The gear material is made of high-strength alloy steel, carburized and quenched. The grinding precision is up to DIN4, which can effectively reduce the weight and noise. The bearing design takes into account the impact resistance requirements, all adopt rolling form, this design can effectively improve The survival rate of the ship; the seal design considers the working conditions with water, which can ensure that the ship can still work for a certain period of time after entering the water in the engine room, so as to smoothly return to the port.
In the design of the adjustable paddle, the design department of the gear and the manufacturing team work together, and the propeller is designed with the most advanced design software. The blade adopts a large side-slope design, which makes the distribution of the surface stress of the blade more reasonable, and the relationship between the ship and the associated flow field is more coordinated, which greatly improves the rapid performance of the ship and can effectively reduce the bubble, vibration and noise of the propeller. . The hub adopts a five-leaf structure, which transmits the driving force through the crank slider mechanism to realize the pitch adjustment. The hub body has a special high-speed profile, which can effectively eliminate the vortex of the hub and reduce the resistance, which adds more benefits to the hydrodynamics. . All parts improve the reliability of the product through finite element analysis (FEM), ensuring that the adjustable paddle can absorb 110% of the total host power and specific impact loads. The shaft of the adjustable paddle consists of a paddle shaft, a manifold shaft and an intermediate shaft. The shaft system is up to 30 meters long. The alloy steel material used for the paddle shaft and the manifold shaft can effectively reduce the weight while ensuring the strength of the system. The light and fast requirements of the ship, the hydraulic coupling type coupling is used for the shaft coupling, which can effectively reduce the cost and man-hour of installation and maintenance. The entire shafting system is calculated by reasonable alignment and cyclotron vibration, and the bearing arrangement on the shafting is adjusted according to the bearing load distribution to improve the service life of the bearing. The front end of the gearbox is equipped with an OD box (distributor), and there are two hydraulically controlled check valves in the rotor to ensure that the pitch of the blade remains at the last command position in the event of a hydraulic system failure; through two linear displacement sensors The pitch signal is output to the remote control system and display device. The hydraulic system is a two-pump system. The main pump is a gearbox machine with a pump to improve the safety of the ship. The electric pump is installed on the hydraulic pump station as a backup. The pitch control valve is excited by the remote control system to introduce the working oil into the OD box. The hydraulic system is elastically mounted to reduce the noise transmitted to the hull and surrounding waters; the remote control system adopts the most advanced European imported brand in the world, adopts multi-redundancy design, and can adopt closed-loop and open-loop control with joint control mode. It can effectively improve the maneuverability and reliability of the ship and perfectly match the mission of the ship.
After the product was delivered to the customer, Hangzhou Tooth also provided a one-month course training for the naval engineer and electrical engineer of the country. The training included the design, manufacture, installation, use and maintenance of the gearbox, installation and use of the adjustable paddle. Maintenance, introduction, use and troubleshooting of the total hydraulic and remote control principle of the adjustable paddle subsystem.
The overall design and manufacture of the main propulsion system of a national navy frigate currently produced by Hangzhou Tooth has reached the world's most advanced level. Its technical content has far exceeded that of ordinary commercial ships, and it is also fully applicable to domestic military ships, sea ships, fishery vessels, etc. Highly advanced modern ships are required.