There are several ways to achieve flow control in a hydraulic transmission system
Control the flow of the component's movement speed by controlling the flow of the medium. It is divided into the regulation circuit and the synchronous loop. 1) speed regulation loop: used to control a single movement speed of executive element, the, can use the throttle valve or control valve to control the flow, as shown in figure of the throttle valve in this role. Throttle valve control hydraulic pump into the flow of the hydraulic cylinder (excess flow through the relief valve flow back into the tank), to control the movement of the hydraulic cylinder speed, this form is called throttling speed control. It can also be used to change the output flow of the hydraulic pump to speed the speed adjustment. (2) : synchronous circuit to control two or more than two components of synchronous operation circuit, for example with the method of the two components of rigid connection, to ensure synchronization; To adjust the flow of the two actuating elements by means of throttle valves or adjustable-speed valves to ensure synchronization; The line of hydraulic cylinder is connected to ensure that the flow of the two hydraulic cylinder is the same, so that the two hydraulic cylinders are synchronized
Use the pressure control valve (see hydraulic control valve) to control the circuit of the system or local pressure. According to the function, the pressure control circuit can be divided into four circuits: voltage, voltage, pressure and voltage. The overflow valve is used to adjust the maximum constant pressure of the hydraulic source. When the pressure is greater than the pressure of the overflow valve, the overflow valve opens up to reduce the output pressure of the hydraulic pump, maintaining the system pressure is basically constant. Variable pressure circuit: the pressure to change the local area of the system, such as a pressure-reducing valve on the back road, reduces the pressure of the relief valve. After a booster, the pressure of the booster is higher than the hydraulic pressure. Discharge circuit: when the system is not under pressure or as long as low pressure, the system pressure is reduced to zero pressure or low pressure through the discharge circuit. (4) voltage regulator circuit, to reduce or absorption system in the local scope of pressure fluctuation and maintain the system pressure is stable, for example, USES the accumulator in the loop.
control components, refers to all kinds of the use of these components can be control and adjustment of the fluid in the hydraulic system pressure, flow and direction, etc., to ensure the actuators can work carried out in accordance with the expected requirements. 4) auxiliary components, including fuel tanks, oil filters, pipes and joints, coolers, pressure gauges, etc. Their role is to provide the necessary conditions for the system to work properly and for monitoring control. 5) working medium, which is the transmission fluid, usually called hydraulic oil. The hydraulic system is used to carry out motion and power transmission through the working medium, and the hydraulic oil can also lubricate the parts of the hydraulic component.
In hydraulic transmission controlled by hydraulic components (hydraulic pump, hydraulic components (all kinds of hydraulic valve, hydraulic actuators (hydraulic cylinder and hydraulic motor, etc.), auxiliary hydraulic parts (pipe and the accumulator, etc) and the hydraulic system of hydraulic oil. component 1) power components, namely hydraulic pump, its function is transmits the mechanical energy is converted to the pressure of the fluid kinetic energy (for the performance of pressure and flow rate), its role is to provide pressure oil to hydraulic system, is the power source of the system. 2) actuators, refers to the hydraulic cylinder or hydraulic motor, its function is to convert hydraulic energy into mechanical energy and isothermal, hydraulic cylinder can drive mechanism to reciprocating linear motion (or moves), hydraulic motor can complete the rotary motion
The method of flow control in hydraulic transmission system has the throttle valve and the speed regulating valve. The flow control valve is the hydraulic control valve that controls the speed of the actuator's movement by changing the valve inlet flow area to regulate the flow of the valve. The usual flow valves have throttling and speed control valves. The key elements used are throttle valves.
