SU1569395A1 - Earth-moving machine working equipment hydraulic drive - Google Patents

Abstract

The invention relates to the field of earthmoving machinery and allows to expand the operational capabilities of the hydraulic drive of the working equipment of the earthmoving machine. The hydraulic actuator contains a power hydraulic cylinder (HZ) 1, a distributor 4 and a regime spool 2. The latter has a spring-loaded plunger. Case 3 spool 2 is made with four grooves. The first groove And communicated with the rod cavity (SHP) HZ. The second groove B communicates with a separate hydroline, through which the piston cavity (PP) HZ 1 communicates with the valve 4 and with the first end cavity 7 of the spool 2. A third hole C communicates with the valve 4 and through the check valve 8 with the first A and fourth D grooves. The spring 5 of the spool 2 is installed in its second end cavity 6, which communicates with the atmosphere. When the scraper is in operation, the HZ 1 rod moves and drives the back wall. Ground dumping occurs. As the scraper's bucket is released from the ground, resistance to movement is reduced. The pressure in the PP decreases to 0.5 ... 0.8 P _max . The plunger of the spool 2, moving to the left according to the scheme, cuts the SP from the drain and informs it from the PP. Due to the differential activation of the HZ, the speed of movement of the rod is increased and the unloading time of the bucket is reduced. To return the rod HZ 1 to the initial position, pressure is through the groove C and the valve 8 is fed to the BF. The plunger of the spool 2 is in the extreme left position. From PP liquid enters the drain. 1 il.

Description

The main cavity 6, which communicates with the atmosphere. When the scraper is in operation, the HZ 1 rod moves and drives the back wall. The soil is being poured. As the scraper's bucket is released from the ground, resistance to movement is reduced. The pressure of the PP decreases to 0.5-0.8 p max. The plunger of the spool 2, moving to the left according to the scheme, cuts the EW from the drain

and reports it to the SC. Due to the differential activation of the HZ, the speed of movement of the rod increases and the time for unloading the bucket is reduced. To return the rod HZ 1 to the initial position, the pressure is through the groove C and the valve 8 is fed to the SPP. The valve plug 2 is in the extreme left position. From PP liquid enters the drain. 1 il.

The invention relates to earthmoving machinery, in particular to hydraulic actuators of working equipment, for example, bulldozers, scrapers.

The aim of the invention is to expand the operational capabilities of the hydraulic drive.

The drawing shows a diagram of the hydraulic drive of the working equipment.

The hydraulic actuator contains a power cylinder 1, a spool 2, in the case 3 of which grooves A, B, C, D, E and distributor 4 are made. The spool 2 interacts with the spring 5 located in the end cavity 6 communicated with the atmosphere, the end cavity 7 communicates with the distributor 4, the second bore B and the piston cavity of the hydraulic cylinder 1. Preva groove A communicates with the distributor 4 through a common check valve 8 and the third bore C with the rod cavity of the hydraulic cylinder 1 and the fourth bore D.

The drive operates as follows.

When dumping soil from the scraper bucket, pressure from the distributor 4 enters the piston cavity of hydraulic cylinder I, into the second groove of body 3 of spool 2, face 7 with groove E. As pressure increases, spool 2 begins to move in the right direction, compressing spring 5, When reaching pressure in the piston cavity of 0.5 Rmo, kc, the connection of the first and second cavities occurs; fluid from the distributor is supplied to the rod cavity of the hydraulic cylinder 1. With a further increase in pressure while moving the valve, the spool 2 cuts off the first the cavity from the second cavity and connects between

0

five

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five

0

five

0

five

is the fourth and third cavities. Duty cycle begins. The rod of the hydraulic cylinder is moved, set in motion, the back wall of the scraper and the soil is dumped. As the scraper bucket is released from the ground, the resistance to displacement decreases, the pressure in the piston cavity decreases to 0.5-0.8 PMake.

The spool 2, moving to the left according to the scheme, cuts off the rod cavity from the drain and informs it with the piston cavity due to the differential activation of the hydraulic cylinder, increases the speed of movement of the rod and reduces the unloading time of the working equipment.

To return the cylinder to the reverse position, the pressure from the distributor is through the third cavity and the non-return valve 8 is fed into the rod cavity. Since the pressure at which the scraper moves to its initial position is small, the spool 2 is in the extreme left position (according to the scheme). From the rod end of the fluid enters the drain. The check valve 8 serves to prevent premature connection of the rod cavity of the hydraulic cylinder with the drain when unloading the scraper.

Claims (1)

Invention Formula The hydraulic actuator of the working equipment of the earthmoving machine, including a power hydraulic cylinder, a distributor and a spool located between them with a spring-loaded plunger and grooves in its housing, through which the distributor is connected to the rod end of the hydraulic cylinder, the piston cavity of which is connected through a separate hydraulic line to the distribution .1569395 the limiter and the first face cavity of the cylindrical core, the second with a spool hollow, a distinctive separate hilroline, a third with a gap and with the fact that, with the aim of an expansion valve and through the inverse of the performance possibility valve with the first and the fourth, hydraulic actuator, the spool body is installed; the spool spring is installed with four threads, perpendicular to its second end cavity, of which it communicates with the rod end which communicates with the atmosphere.