Scraper blade system hydraulic drive

FIELD: earth-moving facilities; hydraulic drives of scraper working members.

SUBSTANCE: proposed hydraulic drive contains pressure spool installed in parallel with like spaces of two hydraulic cylinders, pressure main line connected between two check valves, free outlet of check valve being connected with inlet of pressure spool and one hydraulic cylinder. Free inlet is connected with outlet of pressure spool and other hydraulic cylinder, drum main line connects opposite spaces of hydraulic cylinders. Hydraulic drive is furnished with two series-connected pressure spools. Inlet of first pressure spool and outlet of second pressure spool are connected with outlet of first hydraulically controlled reversible spool. Their common line is connected with controllable space of second hydraulic cylinder and is separated by check valve from pressure main line. Inlets of first hydraulically controlled reversible spool are connected to outputs of second hydraulically controlled reversible spool and are connected with controllable spaces of first and second hydraulic cylinders. One inlet of second hydraulically controlled reversible spool is connected with inlet of pressure spool and is connected to pressure line through check valve, and second inlet is separated from pressure line by other check valve. Control spaces of two hydraulically controlled reversible spools are united and are connected to pressure main line through two-position spool.

EFFECT: improved efficiency of control of scraper blade system.

4 dwg

 

The invention relates to earth-moving machinery, namely the hydraulic working bodies of the scraper.

There is a method of digging a scraper with a constant depth of cut [1], which provides gradual and consistent vyhloubene knife system controlled from the hydraulic cylinders.

Famous bucket scraper, in which each section of blades pivotally connected with the bottom and has a drive of rotation of the cylinders [2]. This drive knives only allows manual control sections knives and cannot ensure the efficient operation of the blade system in a gradual and sequential villablino sections of knives. Such a task can only be solved automatically acting hydraulic drive.

Closest to the present invention is a hydraulic drive two hydraulic cylinders, providing them alternate automatic activation [3]. It contains a pressure valve placed in the same cavity of the two cylinders, the pressure valve connected to the pressure line via a check valve, and the output is separated from her other check valve. However, such a hydraulic drive does not provide sequential operation of three cylinders, as well as changes in the activation sequence during movement of the rods in the same direction.

The invention is directed to promote metabolism of body is the management effectiveness blade scraper system with a constant depth of cut by a gradual, automatic alternate meglumine three sections of the knives and the possibility of changing the sequence of operation of the hydraulic cylinders drive when villablino sections of knives.

This is achieved by a hydraulic actuator is provided with two series, the pressure spool, and the first input and the output of the second pressure spools are connected to the outputs of the first hydraulically operated reversing valve, and a common line connected with the driven cavity of the second cylinder through a check valve is separated from the pressure line, the inputs of the first hydraulically operated reversing valve connected to the outputs of the second hydraulically operated reversing valve and is connected to the managed cavities of the first and third hydraulic cylinders, one input of the second hydraulically operated reversing valve connected with the inlet pressure of the valve and connected to the pressure line via a check valve, and the second is separated from her other non-return valve, cavity control of two hydraulically operated reversible spools and United through a two-position valve connected to the pressure line.

The invention is illustrated by drawings, where figure 1 and 2 shows the sequence of operation of the knife sections, figure 3 - placement (bottom view on the bottom of the bucket) hydraulic cylinders drive a knife system, figure 4 is a hydraulic circuit diagram of the drive.

The hydraulic knife scraper system includes hydraulic cylinders 1, 2, 3 (3)controlling the respective blade sections (figure 1) scraper, the pump 4, the tank 5, the filter 6, the reversing valve 7, the pressure spools 8 and 9, hydraulically operated spools 10 and 11, the adjustable orifice 12, the valve 13 and valves 14, 15, 16 and 17.

The hydraulic works in the following way. Before digging soil scraper operator translates all the sections of the knife system in the lowest position. For this purpose, it includes the right section of the reversing valve 7 (figure 4), and the oil from the tank 5 is supplied by the pump 4 to the joint line, connecting rod (unmanaged) hollow cylinders 1, 2 and 3. Oil of Rodless cylinders (managed) cavities of the cylinders 2 and 3 is pushed out through the check valves 15, 16 and 17, the hydraulically operated valve 10, the valve 13, the reversing valve 7, the filter 6 in the tank 5. After full lower sections of the blades managed by hydraulic cylinders 2 and 3, begins to move the piston rod of the hydraulic cylinder 1. Oil of Rodless cylinders cylinder cavity 1 is displaced in the tank 5 through the reversing valve 7, the valve 13, the check valves 16 and 17, hydraulically operated spools 10 and 11 after the opening pressure of the valve 8.

After completing the preparation of a knife system to the filling of the bucket, the operator moves the reversing valve 7 is neutral in agenie and locks all of the cylinders 1, 2 and 3 all the time until the operation is complete penetration of the bucket.

After the bucket even though the maximum depth of cut, which is determined by the physico-mechanical properties of soil and towing capabilities of the scraper Assembly, the operator turns on one of the positions of the slide valve 13 based on a given technology sequence meglumine knife sections.

Suppose you want to implement a sequence meglumine sections knives 1-2-3 (figure 1). In this case, the operator includes a position "a" of the valve 13 and the left position of the reversing valve 7.

Oil from the pump 4 through the reversing valve 7, the valve 13, an adjustable orifice 12, the check valve 14 and the hydraulically operated valve 10 enters the driven cylinder chamber 1, a rod which begins to move, as rod cylinder chamber 1 has a free discharge through the valve 7 and the filter 6 in the tank 5. The cylinders 2 and 3 at this time can not move, because the oil flow in them locked check valves 15 and 16. Using an adjustable throttle 12 you can change the moving speed of the piston rod of the hydraulic cylinder 1 and the intensity of meglumine corresponding blade section.

Vyhloubene second blade section (figure 1) begins only after full extension of the piston rod of the hydraulic cylinder 1. In this case, start the AET increase the oil pressure in a controlled (Rodless cylinders) cylinder cavity 1. Oil through hydraulically operated spools 10 and 11 opens the pressure valve 8 and begins to act in an adjustable (Rodless cylinders) cylinder chamber 2, which begins willupdate second blade section (figure 1). The check valve 16 will not appear, since the pressure oil to the pressure valve 8 exceeds the pressure in Rodless cylinders cylinder cavity 2. Adjustable choke 12 allows to provide the necessary speed meglumine knife sections controlled by the hydraulic cylinder 2.

After meglumine knife sections controlled by the hydraulic cylinder 2, the increased pressure opens the pressure valve 9, and the oil begins to flow into regulated (Rodless cylinders) cylinder chamber 3 through hydraulically operated spools 10 and 11. The check valve 15 will not appear. The speed of travel of the piston rod of the hydraulic cylinder 3 is determined by the adjustable setting of the throttle 12. Full vyhloubene knife section, controlled by a hydraulic cylinder 3, completes the process of digging. The operator closes the front flap and transports the bucket to the place of unloading.

During the unloading of the bucket simultaneously with opening the front flap, the operator transfers section of the blade (as described above) in the digging position. Planning a ground scraper provides the full width of the bucket and straight cutting edge.

To implement ineioka.bahcesi.net meglumine sections knives (2) it is necessary to change the sequence of actuation of the hydraulic cylinders drive on 3-2-1 (figure 4). This operation is performed by the operator by switching valve 13 to the position "b". In this case hydraulically operated automatic switching spools 10 and 11, which change the sequence of actuation of the cylinders 1-2-3 3-2-1.

In this connection, the oil from the pump 4 through the reversing valve 7 and the position "b" of the valve 13, an adjustable orifice 12, the check valve 14 and the hydraulically operated valve 10 is supplied to a managed (Rodless cylinders) cylinder chamber 3, after full extension of the rod which high pressure oil opens through the hydraulically operated valve 11, a pressure valve 8. Starts to move the piston rod of the hydraulic cylinder 2, and then, after tripping configured at a higher pressure of the pressure valve 9, the oil passes through a hydraulically operated valve 11 in managed (Rodless cylinders) cylinder chamber 1. Thus the hydraulic drive provides a change in the order of actuation of the cylinders 1, 2 and 3 with the sequence 1-2-3 3-2-1.

To return all sections of the knives in the source (for digging) position operator reversing valve 7 supplies the oil in the rod end of the cylinders 1...3. When this right is provided by the drain of the Rodless cylinders cavities of the cylinders 1 and 2 through the check valves 15, 16, hydraulically operated valve 10 and the check valve 17 to regulate the dummy inductor 12.

The hydraulic drive provides sequential, gradual, with adjustable speed vyhloubene sections knives, creating conditions for the work of a knife system with a constant depth of cut. All this reduces the dynamics of the process of digging and facilitates the filling of the bucket scraper. The hydraulic drive also allows you to change the order of meglumine sections of knives depending on requirements engineering slaughter.

Sources of information

1. Patent RU, 2203364, C2, Ál7E 02 F 3/64. The method of digging soil scraper with a constant depth of cut / Nilov VA, Giants AV, Nicotine O.Y, Kosenko A.A. No. 2001116398/03; Claimed 13.06.2001; Publ. 27.04. 2003, bull. No. 12.

2. A.S. USSR, 881211, Ál3E 02 F 3/64, Bucket scraper / Radenko L.A., Ostroverkhov D., Oveshnikov VP and others - No. 2382974/29; Claimed 12.07.76; Publ. 15.11.81, bull. No. 42.

3. Volumetric hydraulic actuators (design issues). Bogdanovich LB "Machinery", 1971 - 172 C. (p.87, risb).

The hydraulic knife scraper system that includes a pressure valve installed in parallel of the same name cavities of the two cylinders, flow valve is included between the two check valves, free outlet check valve connected to the inlet pressure of the valve and one cylinder, and free entry - exit pressure valve and other hydraulic, case drain line, uniting the opposite of the one hollow cylinders, characterized in that the hydraulic drive is equipped with two series-connected pressure spool, and the first input and the output of the second pressure spools are connected to the outputs of the first hydraulically operated reversing valve, and a common line connected with the driven cavity of the second cylinder through a check valve is separated from the pressure line, the inputs of the first hydraulically operated reversing valve connected to the outputs of the second hydraulically operated reversing valve and is connected to the managed cavities of the first and third hydraulic cylinders, one input of the second hydraulically operated reversing valve connected to the inlet pressure of the valve and connected to the pressure line via a check valve, and the second is separated from her other back-pressure valve cavity control two hydraulically operated reversible spools and United through a two-position valve connected to the pressure line.



 

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