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The development of hydraulic technology is almost inseparable from the development and progress of weaponry. During the Second World War, due to military needs, rapid response and high-precision hydraulic components and control systems represented by the automatic aiming electro-hydraulic servo system of anti-aircraft guns appeared, and hydraulic technology was also used in aircraft. So far, hydraulic technology still occupies a very important position in modern weapons and equipment, and is developing in the direction of computational electro-hydraulic control.

Picture shows the schematic diagram of the electro-hydraulic control system of the turret. The system is composed of hydraulic circuit, azimuth control hydraulic circuit and high and low aiming control hydraulic circuit. The azimuth control and high-low aiming control hydraulic circuits are each equipped with the same two-stage electro-hydraulic servo valve. Figure 13-1 Schematic diagram of the turret assembly structure (the front stage is a nozzle baffle type, and the amplification stage is a four-way slide valve type) 27 and 21. It is used to receive the step-by-step amplified command signal from the radar commander to realize the control of the movement direction and speed of the hydraulic cylinder and the hydraulic motor in the two circuits.


    ①Hydraulic source The hydraulic source provides the system with pressure oil that meets a certain cleanliness and temperature in accordance with the action requirements of each actuator. The hydraulic source has two hydraulic pumps 3 and 10, which are driven by an electric motor through a gear reduction mechanism. Among them, the one-way variable pump (constant pressure axial piston pump) 10 is the main pump of the system, and the one-way quantitative pump (gear pump) 3 is the auxiliary pump. The maximum pressure setting, no-load start and pressure increase of the main pump 10 are realized by the overflow valve 15 and the bypass reversing valve M and the electromagnetic reversing valve 13 in the bypass valve group. The pressure of the auxiliary pump 3 is set by the relief valve 8. In order to ensure the no-load start of the main pump 10, when the motor 6 is normally started, the electromagnetic reversing valve 13 is in the right position as shown in the figure. The oil output from the main pump 10 enters the low-pressure auxiliary circuit through the bypass valve 14 and the reversing valve 13 ( Connect with the inlet of the low pressure filter 7). So as to realize the no-load start of the electric motor and hydraulic pump, and then gradually increase their speed. When 10s after starting, the reversing valve 13 is energized and switched to the left position, and the pressure oil of the main pump 10 enters the working system. During work, if the load pressure exceeds the set value of the relief valve 15, the left end of the valve 14 will switch to the left position under the action of the pressure oil. The pump 10 is equipped with an oil filter 2 and the bottom of the oil tank is equipped with a special absorption metal Material magnetic filter.

    ②Azimuth hydraulic control circuit The actuator of this circuit is a hydraulic motor (oblique-axis single-hinge bidirectional fixed M plunger hydraulic motor) 31, whose function is controlled by an electro-hydraulic servo valve 27, which drags the turret to track the target through a reducer. The one-way valve group 30 (two) connected with the outlet of the auxiliary pump 3 is used for the two-way oil supplement of the motor to prevent the suction of a cavity when the motor changes rapidly or brakes suddenly. Two oppositely installed check valve groups 29 leading to the two chambers of the motor are connected with the oil supply path of the main pump 10 to open and drain the oil when the motor pressure exceeds the oil supply pressure of the main pump 10 to play a safety protection role. A damping hole 28 with a diameter of 1 mm is arranged between the two working chambers of the motor to increase the damping of the system and improve the stability of the under-damped valve-controlled motor system. When the control pressure is eliminated, the two cavities of the hydraulic motor can be connected in series through the J-D stop valve 32, so as to realize the manual turning of the turret. The magnetic reversing valve 20 and the hydraulic control check valves zz, Z4 respectively form the orientation and height. Two hydraulic locks on concave roads are used to lock the position of the turret so that it does not move when the hydraulic power is cut off. High and low aiming control hydraulic circuit The actuator is two parallel hydraulic cylinders 26, whose function is controlled by the electro-hydraulic servo valve 21, which pushes and pulls the articulated launcher to move up and down to achieve pitch aiming. The high-low and azimuth circuits share the main pump pressure oil drive. The output pressure of the main pump is set according to the high pressure required by the azimuth circuit, while the high-low control circuit requires a lower working pressure. For this reason, the pressure is reduced by the pressure reducing valve 19. It consists of two throttle valves 18 and a pressure reducing valve. The one-way valve between valve 19 and valve 21 is used to isolate the impact of load pressure fluctuations on the oil source. The orifice 23 stabilizes the launcher. When the control pressure is eliminated, the launching device can be lowered by opening the shut-off valve 25 so that the cylinder 26 discharges oil to the oil tank. Both ends of the cylinder 26 are provided with a damping orifice and a one-way oil supply valve, which are used for buffering at the end of the piston movement stroke.

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