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3.1 Analysis of traction roll hydraulic system
Traction drum is the cable tension directly part, so the traction roll hydraulic system for driving load is very big, need high driving power, and the load varies in a large range, and because the ship under the surging, the instantaneous change of the tension of cables is relatively large, need to overload protection good, at work also need to maintain traction drum running under the condition of high speed and high torque, according to the characteristics of traction drive system drum with variable pump control variable motor, the hydraulic principle diagram shown in Figure 2, the variable pump controlled variable motor is essentially a linear combination of variable pump quantitative motor system and quantitative pump variable motor two.It not only expanded the range of speed, but also has a constant torque and constant power characteristics, thus increasing the torque and power output characteristics to choose, can big torque starting at low speed, realize constant power output at high speed.
As shown in Figure 2, the traction roll hydraulic system mainly includes three hydraulic circuit: TP1 variable pump and variable motor, TM1 main driving circuit; electromagnetic valve SOV1 and the composition of the flow control valve FCV1 hydraulic control hydraulic motor brake action BK1; SOV2 solenoid valve and pressure control valve FCV1 is the hydraulic motor TM1 the outer control loop, the control variable motor output size, adjust the map to achieve motor rotation speed of P1 is the output of hydraulic pump rectangular spooling device hydraulic circuit of the hydraulic pump (see Figure 2), using quantitative pump, the output flow rate and pressure are constant..
Variable motor TM1 with two position three way valve control variable cylinder to change the motor capacity, if the load becomes larger, the motor two oil outlet pressure difference, valve spool down after the variable cylinder circuit conduction, motor capacity increases, motor speed corresponding to slow, the output torque increase if the load is smaller, the motor the two oil outlet pressure difference becomes small, spool up, motor capacity decreases, can realize high speed operation if the load is small, still need to low-speed operation, control oil valve SOV2 charged on variable motor of TM1, the motor rotates at a low speed with low emissions..
Deep sea investigating winch requires not only the uniform speed quick response, and there is plenty of tension in the cables to be able to brake quickly, do not produce sudden downturn in action at the start of the lower levels, the system to achieve this function through the electromagnetic valve SOV1 and a flow control valve FCV1 combination can be, when the hydraulic motor to rotate, the electromagnetic valve SOV1 is connected to PL oil, in the presence of FCV1, will slowly release the brake, avoid motor cable tension control in the instrument fell, on the motor stops rotating, the electromagnetic valve SOV1 disconnect PL circuit, switch on the fuel tank oil, brake BK1 will quickly brake.
3.2 Analysis of the hydraulic system of storage drum
Storage drum at work, when the tension between traction cable reel and the storage drum or the traction tension change of drum of cable, need storage drum speed to make the corresponding adjustment, to control traction between the drum and the storage drum cable tension with traction drum front cable Zhang Lixiang adaptation, in the literature <4> analysis of changes in the storage drum on the cable when the cable between the lateral traction drum and the storage drum cable tension of T2, established the variable pump storage drum controlled quantitative motor system, and discusses the cable tension changes, the frequency characteristics of storage drum speed control method and control system.Block storage drum rotational speed control system is established in this paper can be summarized as shown in Figure 3.
Figure T1 is a drum of cable tension, is a drum and storage drum between cable tension, tension self-adaptive controller is the main part of control system, which can control the hydraulic system pump motor assembly flow, so as to realize the storage drum speed adjustment.