Hydraulic drive of draw-booster gear

FIELD: earth moving machinery.

SUBSTANCE: invention relates to hydraulic drives of draw-booster gears of tractor-drawn scrapers. Proposed hydraulic drive contains pump, hydraulic tank, hydraulic cylinder, pressure valve connected in parallel with hydraulic cylinder, and hydraulic distributor. Hydraulic drive contains additionally hydraulic accumulator, time relay, check valve, pressure valve is provided with control line, and hydraulic cylinder has control arm engaging with two-position spool whose input is connected with pump and output, through time relay, with hydraulic accumulator and control line of pressure valve and with input of check valve whose output is connected to input of pressure valve.

EFFECT: provision of automatic continuous increase of adhesion weight of tractor of scraper when digging.

3 dwg

 

The invention relates to the field of earth-moving machines, in particular for hydraulic dorogaya towing devices towed scraper.

Known scraper train [1], which includes a tractor with a variable coupling weight. Hitch weight is increased by putting the front axle of the towed scraper with hydraulic cylinder, mounted on the carrier, and a flexible connection between him and the bridge towed scrapers. The device provides a one step increase of coupling weight of the truck.

Such a device is not effective because it does not provide increased coupling weight of the tractor to the maximum value in the final stage of filling of the bucket (there is no second stage of loading).

Closest to the claimed technical solution is the hydraulic operating equipment towed scrapers [2], which provides two degrees of loading of the truck. The first step of loading at the expense of the weight of the front axle scraper when empty the bucket, and the second by increasing the vertical load on the front axle towed scraper when filling the bucket with soil.

However, this device does not provide a continuous increase of coupling weight of the tractor trailer scraper as due to the discreteness of the additional load, and due to the uncertainty (subjective experience of the operator) mo is enta transition to the second stage of loading.

The invention is directed to an automatic and continuous increase of the coupling weight of the truck towed scrapers depending on the amount received in the bucket of soil.

This is achieved by the hydraulic actuator further comprises a hydraulic accumulator, timer, check valve, pressure valve has a control line, the hydraulic cylinder is supplied with line management, which interacts with an on / off valve, the inlet of which is connected to the pump, and the output - through time relay with hydraulic accumulator and line control valve pressure, and inlet check valve, the output of which is connected to the valve inlet pressure.

The invention is illustrated by drawings, where figure 1 presents the towed scraper Assembly, figure 2 - scheme of work pogrujayuschee device, figure 3 - diagram of the hydraulic drive.

The scraper Assembly includes a Prime mover 1, the towed scraper 2, drawbar degradee device 3 (Fig 1). Towing degradee device 3 has a trailing beam 4, which connects the front axle 5 (2) towed scrapers 2 with the frame of the tractor 1 through the control device 6. Trailer beam 4 is connected with an arch-trunk 7 trailer scraper 2 ball joint 8 between the arch-trunk 7 and trailed beam 4 on ball joints mounted hydraulic cylinder 9, is provided with a separate hydraulic drive (figure 3). Hydropro the od includes a pump 10, tank 11, a filter 12, a valve 13, the valve pressure 14 (version control pressure from the control line), time relay 15, consisting of an adjustable throttle 16 and two hydraulically operated spools 17 and 18, the check valve 19, the hydraulic accumulator 20, a two-position valve 21 attached to the housing of the hydraulic cylinder 9, and the management line 22, connected with the rod of the hydraulic cylinder 9.

The hydraulic actuator operates as follows.

In transport mode, the operator of the tractor 1 moves the valve 13 in the floating position, thereby ensuring the free movement of the linkage bar 4 and the arch-trunk 7 required the towed scraper 2 when driving on uneven bottom and roads.

To increase the coupling weight of the tractor 1 and automatically maintain the highest possible level of the operator of the tractor 1 by a valve 13 takes the oil from the pump 10 in Rodless cylinders cylinder chamber 9 (Fig 3) and secures the valve 13 in this position all the time digging. The piston rod of the hydraulic cylinder 9 starts to move, which leads to the hanging of the front axle 5 trailer scraper 2. This increases the vertical load on the control device 6, and thus the coupling weight of the tractor 1 (figure 2).

Since the vertical load on the front axle 5 trailer scraper 2 in the empty bucket which has a fixed value, it specifies the spring valve pressure 14 to regulate the pressure of providing for the hanging of the front axle 5 (oil pressure in the control line valve pressure 14 is absent, because the hydraulic accumulator 20 is completely discharged). In this case, the pusher two-position valve 21 is located at the end of the thin plot line management 22, fixed on the rod of the hydraulic cylinder 9. In this position (figure 3) hydraulic drive provides a minimal increase in the coupling weight of the tractor 1.

Upon receipt of the soil in the bucket towed scrapers 2 starts to increase the vertical load on the front axle 5, which reduces the length of the rod of the hydraulic cylinder 9 and the contact pusher two-position valve 21 with the "fat" part of the line of control 22. The result is a switching-off valve 21 through which the oil enters the cavity of the control and input hydraulically operated valve 18, which begins feeding oil through an adjustable orifice 16 in the hydraulically operated valve 17. To fill the cavity hydraulically operated control valve 17, you need a certain time (2...3 seconds). After this time there is a hydraulically operated switching valve 17, the oil from the two-position valve 21 is supplied to the hydraulic accumulator 20 (it starts charging) and the control line g is of toclafane pressure 14, increasing the opening pressure of the valve pressure 14. The result is increased pressure in Rodless cylinders cylinder cavity 9, the stem of which begins to run again, lifting front axle 5 trailer scraper 2.

The pusher two-position valve 21 begins to interact with the "thin" part of the line of control 22, which disables the timer 15 and the hydraulic accumulator 20 from the pump 10. The hydraulic actuator in this position hidroapparatus automatically provides a new level of loading of the Prime mover 1. The pressure in the hydraulic accumulator 20 is not reduced, since the check valve 19 is closed by the higher pressure in Rodless cylinders cylinder cavity 9.

Upon receipt of the soil in the bucket towed scrapers 2 will increase the vertical load on its front axle. The cycle of operation of the hydraulic actuator is repeated, the hydraulic drive automatically controls the length of the cylinder 9 so that it was sufficient for marking the front axle 5 (figure 2). Time relay 15 smoothes inadvertent operation of the two-position valve 21 due to the irregularities of the face, changing the depth of cut, etc.

Before maglubiyet bucket tractor operator moves the valve 13 in a floating position, opens the check valve 19, is discharged accumulator 20, the valve pressure 14 is closed, and the lengths of the hydraulic cylinder 9 is set automatically depending on the longitudinal profile of the path.

The hydraulic drive provides automatic and continuous increase of the coupling weight of the truck towed scrapers depending on the amount received in the bucket of soil. This increases the traction capabilities of the scraper Assembly, reduces operator fatigue and improves performance.

Sources of information

1. A.S. USSR, 985199, M CL3E 02 F 3/58. Scraper train / Nilov VA - No. 3324405/03. Declared 04.08.84. Publ. 30.12.82. Bull. No. 48.

2. Patent RU, 2243329, C1, M CL7E 02 F 9/22. The hydraulic operating equipment towed scrapers / Nilov VA, Nikulin P.I., Kosenko A.A. and others - No. 2003118027/03. Declared 10.06.2003. Publ. 27.12.2004. Bull. No. 36.

The hydraulic pogrujayuschee trailer hitch comprising a pump, a hydraulic reservoir, a hydraulic cylinder, a pressure valve connected in parallel to the hydraulic cylinder, valve, wherein the hydraulic actuator further comprises a hydraulic accumulator, timer, check valve, pressure valve has a control line, the hydraulic cylinder is supplied with line management, which interacts with an on / off valve, the inlet of which is connected to the pump, and the output through the relay time - with hydraulic accumulator and line control valve pressure, and inlet check valve, the output of which is connected to the valve inlet pressure.



 

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