Hydraulic drive of paver implements

The hydraulic drive of the asphalt paver is used to drive the following

working bodies:

- hopper flap drive (extension-retraction, hydraulic cylinder

C1);

- drive of hopper sidewalls (extension-retraction, hydraulic cylinder C2);

- Distributor auger drive (auger rotation, hydraulic motor)

M1);

- drive of the vibrating tamper bar (M2 hydraulic motor).

The hydraulic system consists of four circuits: M1 hydraulic motor circuit

(distributor auger drive), M2 hydraulic motor circuit (drive

vibrating tamper bar), hydraulic cylinder circuit C1 (drive

hopper flaps), hydraulic cylinder circuit C2 (hopper sidewall drive).

These hydraulic motors are connected in parallel.

The reservoir for the working fluid is the hydraulic tank B. Pump H1

adjustable flow is used to power the hydraulic motors M1, M2 and

hydraulic cylinders C1 and C2. The non-variable H2 pump is used for power supply

control loop of power distributors R1... P4 with the help of

control distributors R5... R12. Variable N1 Pump Suction

working fluid from tank B. Further, the working fluid comes from the pump H1

through the DP flow divider to the power distributors R3, R4 s

hydraulic control, as well as to power distributors P1, P2,

which control the hydraulic cylinders C1, C2 respectively. Divisor

The DP flow is used to divide the flow into two parts (equal to or equal to the

proportional) regardless of the loads on the shafts of the M1 and

M2. Also, the working fluid is supplied from the H1 pump to the safety pump.

Indirect valve KP6, which protects the H1 pump from overloads.

From the safety valve KP6, the working fluid enters the drain

main and drains into tank B.

From the P1 power distributors... P4, which are

three-position six-line with hydraulic control,

working fluid is supplied to M1 and M2 hydraulic motors and C1 hydraulic cylinders,

Q2. Depending on whether the left or right position of the poppet is engaged

power distributor R1... R4, the shafts of the M1 and M2 hydraulic motors will be

rotate in one direction or the other, and the rod of hydraulic cylinders C1, C2

will be extended or retracted. Discharge and discharge hydraulic lines

M1 and M2 hydraulic motors are connected by safety valves

indirect action KP1, KP2 and KP3, KP4 respectively. Data

Safety valves are used to protect the hydraulic motors from

Overloads. From the P1 power distributors... P4 working fluid

is drained into the drain line, and through the drain filter F enters the tank B.

Let's take a look at the operation of the control loop of power distributors

R1... R4. From the H2 pump, the working fluid flows to the inlet of the distributors

R5... P12, which are two-position, three-line

electrically controlled. Each of the P5 distributors... R12 Connected

with the corresponding end of the spool of the power distributors R1... R4. At

actuation of any of the electromagnets of the P5 distributors... R12

The working fluid flows to the end of the spool of the power distributor and

moves it to the extreme position, while the working fluid will be

from the H1 pump through the power distributor to the appropriate

hydraulic motor. The working fluid is drained from the P5 distributors... R12 in

drain line, and through the drain filter F enters tank B.

The safety valve of the H2 pump is the KP5 valve.