Trailed scraper hydraulic system

FIELD: transport.

SUBSTANCE: fluid-controlled slide valve is arranged between load mechanism hydraulic cylinder rod end and pressure valve inlet line. Control chamber of said valve is communicated with front shutter drive hydraulic cylinder chamber for it to be closed.

EFFECT: independent operation of hydraulic cylinders.

2 dwg

 

The invention relates to hydraulic systems earth-moving machines, in particular scraper.

Known hydraulic system scrapers [1], including the tank, pump, triple valve, the actuating cylinders control bucket, front flap and rear wall, a filter and piping. This hydraulic system provides independent operation of all working bodies of the scraper, but it does not provide for maintenance of additional equipment.

You know trailer hitch scraper [2], which increases the coupling weight of the tractor and performance. However, to drive his Executive power cylinders in the hydraulic scrapers require installation of additional sections of the valve, which increases the hydraulic system and complicates the work of the operator.

Closest to the claimed technical solution is a scraper train [3], which has to control the hydraulic cylinder loading (increasing the coupling weight of the tractor and the rear wall of the bucket used one section of the regular three-section of the valve, usually used to control the rear wall of the bucket. The device provides for the installation of hydraulic cylinder recharging to increase the coupling weight of the tractor in parallel hydrotrend is in control of the rear wall of the bucket.

This hydraulic system simplifies and reduces the hydraulic system, however, the operation returns back wall to its original position after discharge of the ground there is a constant tension of the flexible connection, which makes it very difficult maneuvering of the tractor when driving on an uneven surface of the blade.

The invention is aimed at ensuring the free maneuvering of the truck during unloading and the layout of the ground by providing the independent functioning of the hydraulic cylinders increase coupling weight and rear walls of the bucket. This technical result is achieved in that between the rod cavity of the hydraulic cylinder mechanism reload or input line pressure valve is installed hydraulically operated valve, the control cavity which is connected with the cylinder chamber of the actuator of the front flap, providing its closing.

Common features of the prototype and the inventive device are: 1) valve; (2) hydraulic cylinder of loading; (3) hydraulic cylinders drive bucket, front flap and a back wall; 4) pressure spool.

Distinctive features are: 1) hydraulically operated valve; 2) the connection cavity hydraulically operated control valve with the cylinder chamber of the actuator of the front flap.

The essence of the proposed hydraulic explained to the drawings of which, where figure 1 shows itself hydraulic system; figure 2 is given to the location of elements on the tractor and scraper.

The hydraulic system includes a tank 1 by pump 2 (figure 1) and a filter 3, a valve 4, which consists of three sections 5, 6 and 7 installed on the tractor 8 (figure 2). Section 5 controls the hydraulic cylinders 9 of the bucket 10, section 6 controls the hydraulic cylinders 11 of the front flap 12, section 7 controls the hydraulic cylinders 13 of the rear wall 14 and the recharging of cylinders 15 of the tractor 8. In the hydraulic system provides pressure valve 16 and the hydraulically operated valve 17, and pipelines.

The hydraulic system operates as follows.

Before you start digging the cylinders 13 and rear wall 14 are located in the extreme right position (Fig 1). The operator of the tractor 8 section 6 of the valve 4 takes the oil in the rod cavity of the cylinders 11 of the actuator of the front flap 12, Rodless cylinders, the cavity of the cylinder 77 and the cavity of the hydraulically operated control valve 77 is communicated with the drain, and the hydraulically operated valve 17 informs the rod end of the cylinders 13 and 15. As a result, begins to move the piston rod of the hydraulic cylinder 17 and the front valve 12 opens on to fill the bucket 10 value.

To increase the coupling weight of the tractor 8 statement section 7 of the valve 4 on the all time digging GRU is that feeds oil to the rod end of the hydraulic cylinders 15 through the hydraulically operated valve 17 and directly into the rod end of the hydraulic cylinders 13 control rear wall 14. Because the cylinders 13 are in the right position and can't move, the movement start (retract) the cylinders reload 15. When this pressure valve 16 automatically maintains a preset pressure in the rod end of the cylinders 15 and reload the incremental value of the coupling weight of the tractor 8 (figure 2). If you want to create the maximum increase of the coupling weight of the tractor 8, the discharge valve 16 is set at an appropriate pressure, and after the increase of the coupling weight of the tractor hydraulic cylinders reload 15 lock section 7.

The filling of the bucket 10 start with increased coupling the weight of the tractor 8. For this purpose, the operator controls the size of the chip by hydraulic cylinders R drive bucket 10 through section 5 of the valve 4. After filling the bucket with soil and the transition to the transport mode, the operator removes the additional load from the Prime mover 8, maglubiyet bucket 10 and closes the front flap 12. To do this, it is section 7 of the valve 4 takes the oil in the Rodless cylinders, hollow cylinders 13 and 15. The cylinders 13 due to the presence of soil in the bucket 10 to move can not, therefore, begin to move (forward) the cylinders reload 15 and the additional load of the Prime mover 8 is removed due to sagging of the flexible connection (figure 2).

After full extension of the piston rods of the hydraulic cylinders 15, the operator although the ache transfers 8 section 7 of the valve 4 in a locked position, and sections 5 and 6 shall vyhloubene bucket 10 and closing the front flap 12. While the rod end of the cylinders 13 and 15 dismantled.

For unloading of the soil in the stockpile operator section 5 and the hydraulic cylinders 9 lowers the bucket 10 at the height of the discharge section 6 and the cylinders 11 opens for discharging ground the front flap 12. While the rod end of the cylinders 13 and 15 are connected via a hydraulically operated valve 17. Unloading of the soil the operator shall, when submitting section 7 of the oil in the Rodless cylinders, hollow cylinders 13 and 15. Because the cylinders 15 is fully extended and not be moved can then begin to move the cylinders 13, which actuate the rear wall 14 engaged in the discharge of soil from the bucket 10.

After unloading of the soil, the operator of the tractor 8 section 5 of the valve 4 by hydraulic cylinders 9 raises the bucket 10 in the transport position, section 6 closes the front flap 12, the rod end of the cylinders 13 and 15 dismantled. Section 7 the operator delivers the oil in the rod end of the hydraulic cylinders 13, which produce a return back wall in the source for digging (extreme right) position. The cylinders reload 15 thus remain fixed (fully extended).

The proposed hydraulic system provides increased is their coupling weight of the tractor 8 is not only digging, but (if necessary) in transport mode. This requires section 6 of the valve 4 briefly apply the oil in the rod cavity of the cylinders 11 of the actuator of the front flap 12. This pressure pulse is sufficient to message the rod ends of the cylinders 13 and 15 and provide additional loading of the Prime mover 8 by retracting cylinders reload 15 with the inclusion of section 7 of the valve 4. Next cycle of operation of the hydraulic system is repeated.

The proposed hydraulic system provides free maneuvering of the truck during unloading and the layout of the ground and the independent functioning of the cylinders increase coupling weight and rear walls of the bucket, it does not require installation of additional sections in a regular valve. All this contributes to reducing the cost of the hydraulic system and simplifies the management of the scraper.

Sources of information

1. Voynich L.K., Priamikov RG Guide the young driver of the bulldozer, scraper, grader. - 2nd ed., revised and enlarged extra - M.: Higher. school, 1979 - 199 C.(p.60,picture.35).

2. RF patent №2244071, IPC7: E02F 3/64, from 11.06.2003, publ. 10.01.2005, bull. No. 1.

3. AS of the USSR, No. 1198164, M CL4.: E02F 3/58, 3/64 from 30.03.82, publ. 15.12.85,bull. No. 46.

Hydraulic scraper, comprising a hydraulic pump, filter, tank, valve, piping, napryklad, the hydraulic cylinders drive bucket, front flap and United the same cavities of the hydraulic cylinders of the rear wall and additional loading mechanism, characterized in that between the rod cavity of the hydraulic cylinder mechanism reload or input line pressure valve is installed hydraulically operated valve, the control cavity which is connected with the cavity of the hydraulic cylinders drive the front flap.



 

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9 dwg

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