Abstract: This paper introduces the development and production of radial piston pump at home and abroad. The structural characteristics and performance indexes of YPG pump with high and low noise were mainly described, and the prospect and application of the product were also briefly analyzed. Keywords: Radial piston pump Structural characteristics Performance index With the continuous development of science and technology, the automation of modern equipment is getting higher and higher. The hydraulic transmission and control system is widely used in all walks of life for its advantages of high transmission power, high control precision, fast response speed, easy integration of electro-hydraulic and hydraulic control. As the hydraulic system power source - hydraulic pump requirements are getting higher and higher. Radial piston pump with its high working pressure, impact. Long service life, high control precision and low noise, which arouse the attention of the domestic and international hydraulic pump manufacturers and the favor of the manufacturers. It is widely used in metallurgy, mining, forging, injection molding, shipbuilding, heavy machinery and equipment. 1, the development and production of radial piston pump at home and abroad Radial piston pump can be divided into two types of valve with valve flow and distribution. Valve distribution radial piston pump has the disadvantage of high failure rate and low efficiency. The international development of the 70,80 generation shaft radial flow radial piston pump to overcome the valve with radial piston pump deficiencies. Due to the structural features of the radial pump, Shaanxi set the axial flow radial piston pump axial piston pump impact resistance, long life, high control accuracy. Making it an excellent high-pressure pump, representing the international advanced level of hydraulic pump manufacturing. However, it has high technology content and is difficult to manufacture and manufacture. Only a few companies in the world, such as BOSCH and VOITH, can produce. The Bosch company can only produce 90mL eight specifications of the pump, Voith company only produces 110 a 250mL / r specifications of the pump. Since the late 1980s and early 1990s, many research institutes and manufacturers began to research and develop such products in our country, but none of them made any substantial progress. Mainly because of the need to deepen in theory, the actual production can not solve the rotor and the distribution axis, slipper and stator pairs of friction pair burned. Some manufacturers in the rotor bore by casting bearing alloy and other methods to overcome burning research, but the effect is not satisfactory, this approach is used in small displacement pump, although it can prevent the problem of friction co-firing, but the pump life not long. By our famous hydraulic expert Professor Lu Wang and material experts Professor Leng Bingjun and his group after years of research and development, has made "over balanced pressure compensation and double row radial piston pump" and "a new type of high pressure Displacement dual rotor radial piston pump "two technology patents," alloy austenite-bainitic ductile iron development and application of "a national new material technology achievements. The achievement of these technical achievements made the development of radial piston pump in our country make breakthrough progress in the design theory and material technology. Lanzhou Yongxin Technology Co., Ltd. to the above two patents and a new material technology achievements for the support of the successful development and production of JBP series of electromechanical controlled radial piston pump, the State Ministry of Science and Technology "85" research and national science and technology Torch Program Project. The pump in a number of enterprises conducted 2-3 years of industrial assessment test, excellent performance. 2, working principle and structure characteristics 2.1, working principle Figure 1 shows the pump structure and working principle diagram The drive torque is transmitted from the drive shaft 1 to the star-shaped cylinder body rotor 3 via the Oldham coupling 2, and is not subjected to any other lateral forces. Turn on the distribution axis 4. The radially arranged plunger 5 in the rotor is fixed at 7 with the hydrostatic balancing shoe 6 in close contact with the eccentric stroke. The plunger is connected to the ball pivot of the shoe and is locked by a snap ring. Two retaining rings 8 snap the shoe onto the travel stator. When the pump rotates, it rests on the inner surface with centrifugal force and hydraulic pressure. When the rotor rotates, due to the decentering effect, the plunger reciprocates and its stroke is set at twice the eccentricity. The eccentricity of the stator can be adjusted by two plungers 9, 10 located diametrically on the pump body. In and out of the fluid passes through the pump body and the flow passage on the distribution axis and is controlled by the oil suction on the distribution axis, and the hydraulic pressure generated in the pump body is absorbed by the surface of the static pressure balance. The static pressure balance of friction pair adopts over-balanced pressure compensation method, forming open-loop control (invention patent). Bearings supporting the drive shaft only play a supporting role, free from other external forces. 2.2, structural characteristics (1) simple structure can be seen from Figure 1. The design of the pump is simple and reasonable structure, a small number of parts. (2) variable stroke Short pump variable is variable piston and limit plunger under the action of changing the eccentricity of the stator to achieve, and set the maximum eccentricity of 5-9mm (according to displacement size), variable Short trip. The variable mechanism is designed for high-pressure operation and is controlled by a control valve. Therefore, the pump response speed. (3) radial structure design to overcome such as axial piston pump slipper wear problems. Its anti-impact ability is greatly improved. (4) The over-balanced pressure compensation design enhances the static pressure bearing friction of the friction pair and overcomes the problem that the friction pair grinds the glue. Not only the pump's shock resistance and anti-pollution ability to significantly enhance, but also reduce the wear and tear. Thus prolonging the life of the pump. (5) The core material of the pump is made of Obeying ductile iron and has been specially heat-treated to greatly improve the thermal bite resistance and abrasion resistance of the main moving parts. The wear resistance is the same as that of the international similar products 2.7 times. Further ensure the service life of the pump. (6) Variable control mode The modular design makes this series of pumps easy to achieve a variety of control methods such as constant pressure, hydraulic remote constant pressure, electro-hydraulic ratio, load sensitivity, constant power and so on. Both to meet the open system, but also to meet the closed system. 3, performance indicators Displacement: 10 ~ 25OmL / r Working pressure: 31.5MP The maximum working pressure: 35MPa Peak pressure: 42MPa Volumetric efficiency: 90% -96% Total efficiency: 85% -90% Response time: variable 50-80ms; feedback 80-120ms Minimum suction pressure day: 0.08MPa (absolute pressure) Ambient temperature: -15- +60 ℃ Oil viscosity: 10-76CSt Working medium: mineral oil or other hydraulic medium Allow the maximum speed: 1800 ~ 2500r / min Noise level: 250mL / r pump at 31.5MPa pressure <80dB (A)
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