Hydraulic system for filling-up device

FIELD: mining, particularly hydraulic drives of earth-moving machines.

SUBSTANCE: hydraulic system comprises hydraulic pump, hydraulic reservoir, hydraulic cylinders for bucket drive, front gate, rear wall, as well as pressure valve with filling-up hydraulic cylinder having rod end communicated with hydraulic reservoir. Serially arranged between hydraulic pump and blind side of filling-up hydraulic cylinder are electrically driven two-position two-way valve member, check valve, hydraulic accumulator with pressure relay and hydrocontrolled two-position two-way and four-way valve members. Two-way and four-way valve members have control cavities communicated with rod end of rear wall drive hydraulic cylinder. Opened line of electrically driven two-way valve member connects hydraulic pump and blind side of filling-up hydraulic cylinder through check valve, hydraulic accumulator, pressure relay and opened lines of two-position two-way and four-way valve members. Closed line of hydrocontrolled two-position four-way valve member disconnects hydraulic pump and rod end of filling-up hydraulic cylinder. All inlets and outlets are connected with each other through the four-way valve member in the second position.

EFFECT: decreased power inputs for filling-up hydraulic cylinder operation due to possibility of hydraulic accumulator usage.

2 dwg

 

The invention relates to hydraulic earth-moving machines and allows you to reduce power consumption for the drive pogrujayuschee device.

Known scraper train [1], including tractor, trailer scraper and pogruzhalsy cylinder, in which the necessary pressure is automatically maintained pressure valve.

The disadvantage of the scraper trains are the significant cost of the engine power of the tractor to maintain the set pressure of the oil in dorogaya the cylinder due to the throttling of the oil in continuous operation pressure valve.

Known hydraulic drive [2], supporting the specified pressure in the hydraulic cylinder through a hydraulic accumulator, which significantly reduces the cost of power to maintain a given pressure in the cylinder.

However, this hydraulic drive does not provide the hydraulic cylinder floating position, which is necessary for the cylinder recharging towed scrapers during transport operations.

Closest to the proposed technical solution is the hydraulic operating equipment towed scrapers [3], which increases the coupling weight of the tractor digging and floating position of the hydraulic cylinder additional loading on transport operations. However, it is not designed to work in low power mode with the hydraulic accumulator.

The purpose of the image is etenia is the maximum cost reduction power when pogrujayuschee cylinder through the use of accumulators. This is achieved by hydraulic rod cylinder chamber of the additional load is connected to the tank. In addition, between the hydraulic pump and Rodless cylinders, the cylinder chamber reload sequentially installed: on-off 2-way valve with electric control, check valve, hydraulic accumulator with a pressure switch and a hydraulically operated two-position 2-line and 4-line spools, cavity control which is connected with the rod of the cylinder chamber rear wall, with an open line 2-line valve with electric control through the check valve, accumulator, pressure switch and open dip 2-line and 4-line spools with hydraulic control connects the hydraulic pump and Rodless cylinders, the cylinder chamber recharging, and the closed-line-position 4-way valve with hydraulic control disconnects the pump rod and cylinder chamber reload, in addition, all inputs and outputs are interconnected through the second position of the 4-way valve.

The essence of the inventive device is illustrated by drawings, where figure 1 shows a General view of the scraper Assembly and placement of Executive cylinders, figure 2 - hydraulic system pogrujayuschee device.

Hydraulic system pogrujayuschee device is installed on scraper the th unit, includes tractor 1 and trailer scraper 2 (figure 1), which has Executive hydraulic cylinders drive bucket 3, the front flap 4, rear wall 5 and the cylinder recharging 6. On the carrier 1 is set to a hydraulic pump 7, the tank 8, a valve 9, a filter 10, and the hydraulic accumulator 11, the discharge valve 12, valve 13, a pressure switch 14 with the electrically-controlled valve 15 and hydraulically operated spools 16 and 17.

Hydraulic system pogrujayuschee device operates as follows.

For the implementation of a set of soil with increased coupling the weight of the tractor 1 operator transfers section of the valve 9 which controls the hydraulic cylinder of the rear wall 5, at some time in the floating position. When this cavity hydraulically operated control spools 16 and 17 communicate with the sink and they are set by the spring to its original position (figure 2). Simultaneously, the oil pump 7 through the electrically-controlled valve 15 and the check valve 13 is supplied to the hydraulic accumulator 11 and Rodless cylinders, the cylinder chamber of the additional load 6 through open lines of hydraulically operated spools 16 and 17. Starts increasing oil pressure in the hydraulic accumulator 11 (its charge) as long as does not exceed the set pressure of the pressure valve 12, limiting the oil pressure in the hydraulic accumulator 11 and the cylinder is balance 6. Simultaneously with the opening of the discharge valve 12 is activated pressure switch 14, which includes an electrically-controlled valve 15. In the hydraulic accumulator 11 is disconnected from the hydraulic pump 7 and is insulated from it, a check valve 13, and Rodless cylinders, the cylinder chamber reload 6 will be under a working pressure hydraulic accumulator 11 up until due to leakages or significant movement of the piston rod of the hydraulic cylinder recharging of 6 the pressure in the hydraulic accumulator 11 becomes lower than the setting pressure switch 14.

In this case, the pressure switch 14 de-energizes the electrically-controlled valve 15, which connects the cavity of the hydraulic accumulator 11 with the hydraulic pump 7 (charge mode). Thus, after the message control lines hydraulically operated spools 16 and 17 from discharge of the hydraulic system provides automatic maintenance of pressure in the hydraulic cylinder recharging of 6 within the specified limits with a minimum operating time of the pressure valve 12, which ensures the increase of the coupling weight of the tractor 1 with minimum energy consumption.

After filling the bucket scraper 2 operator 1 switches the hydraulic system pogrujayuschee device to a transport mode in which the hydraulic cylinder recharging of 6 must be in the floating position. For this purpose, the valve operator 9 for a short time podaa the oil in the rod cylinder chamber rear wall 5. The rear wall is in its rightmost position and cannot go. Simultaneously, the oil enters the cavity of the hydraulically operated control spools 16 and 17, which are switched into the second position. In the hydraulically operated valve 16 disables the hydraulic accumulator 11 from pogrujayuschee cylinder 6 (figure 2), and hydraulically operated valve 17 provides a floating position dorogaya the hydraulic cylinder 6. Pressure switch 14 and the electrically-controlled valve 15 and provide for the automatic charging of the hydraulic accumulator 11.

During the unloading of the bucket 2 rod cylinder chamber rear wall 5 is connected with the sink, hydraulically operated spools 16 and 17 connect the cylinder recharging of 6 to the hydraulic accumulator 11, which provides increased coupling weight of the tractor 1 during unloading of the bucket and overcoming the increased resistance to movement of the scraper Assembly for loose ground in the blade. With the return movement of the rear wall in the rod end of the hydraulic cylinder actuator 5 creates excessive oil pressure that causes the hydraulically operated spools 16 and 17, which brings the cylinder recharging of 6 in a floating position (transport mode), separating it from the hydraulic accumulator 11.

The proposed hydraulic system pogrujayuschee device provides hydrotrend is the recharging of 6 automatic transition into a floating position, which provides a scraper Assembly all necessary relative displacement on the transport mode. Digging soil the proposed hydraulic system provides increased coupling weight of the tractor and maintaining it at a given level with minimum energy consumption.

Sources of information

1. A.S. 985199 the USSR, MKI302F 3/58. Scraper train / Nilov VA (USSR), No. 3324405/29; claimed 4.08.81; publ. 30.12.82; bull. No. 48.

2. Volumetric hydraulic actuators (design issues). Bogdanovich LB "Machinery", 1971 (s-166, RES, 109).

3. A.S. 1638272 the USSR, MKI502F 9/22. The hydraulic operating equipment towed scrapers / Nilov VA (USSR), No. 4454022/03; claimed 4.07.88; publ. 30.03.91; bull. No. 12.

Hydraulic system pogrujayuschee devices, including hydraulic pump, hydraulic tank, hydraulic cylinders drive bucket, front flap, back wall and the discharge valve to the hydraulic cylinder recharging, rod cavity which is communicated with the tank, characterized in that between the hydraulic pump and Rodless cylinders, the cylinder chamber reload consistently set dip-SW 2-way valve with electric control, check valve, hydraulic accumulator with a pressure switch and a hydraulically operated two-position 2-line and 4-line spools, cavity control which is connected with the rod of the cylinder chamber rear wall and, this open line 2-line valve with electric control through the check valve, accumulator, pressure switch and open dip 2-line and 4-line spools with hydraulic control connects the hydraulic pump and Rodless cylinders, the cylinder chamber recharging, and the closed-line-position 4-way valve with hydraulic control disconnects the pump rod and cylinder chamber reload, in addition, all inputs and outputs are interconnected through the second position of the 4-way valve.



 

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