Floating control multi-way valve of bulldozer

Abstract

Provided is a bulldozer floating control multi-way valve. The problem that mechanical limiting of an existing bulldozer is not reliable is solved. The reversing valve comprises a valve body, a first oil port, a second oil port and an oil inlet, and further comprises a reversing valve rod. The piston is arranged in the valve body and is in sliding fit with the valve body; the reversing valve rod is provided with a first position for controlling the bucket to lift up, a second position for stopping, a third position for floating and a fourth position for controlling the bucket to shovel materials; the pilot oil way is arranged on the valve body; and the control valve is arranged on the valve body, and pilot oil in the pilot oil way enters a control oil cavity of the valve body through the control valve and is used for controlling the reversing valve rod to move. The hydraulic control system has the advantages that the pilot oil way and the control valve are arranged, the valve rod is controlled to move through the control valve, higher precision and control performance are achieved, the control mode is more flexible and more reliable, and integration and automation can be achieved conveniently. The utility model also has the advantages of simple structure, convenience in assembly, reliable action, long service life and the like.

Description

Technical Field

[0001] The utility model relates to a hydraulic control system for controlling a bulldozer, in particular to a floating control multi-way valve for a bulldozer. Background Art

[0002] Bulldozer is a kind of earth-moving machinery that can dig, transport and dump rock and soil. It has a wide range of uses in open-pit mines. For example, it is used to build dumps, level automobile dumps, pile up scattered ore and rock, level work platforms and construction sites, etc. It is not only used for auxiliary work, but also for main mining work. For example: stripping and mining of sand ore beds, traction and boosting of scrapers and plows, and lowering the height of stripping steps in cooperation with other earth-moving machinery when there is no transportation mining method.

[0003] The action of the bulldozer bucket is usually controlled by a hydraulic multi-way valve. The floating position of the bulldozer means that when the reversing multi-way valve is in the floating position, the upper and lower chambers of the hydraulic cylinder are connected to the oil tank, and the piston rod moves freely with the change of external force. During the leveling process, the bulldozer will automatically rise and fall according to the height of the ground. The floating function can help the bulldozer to level the ground easily and efficiently. The first working position and the second working position of the conventional bulldozer are realized by a mechanical limit structure, which makes the product structure complex, with many parts and low control accuracy. Utility Model Content

[0004] In order to solve the problem of unreliable mechanical limit of the existing bulldozer in the background technology, the utility model provides a floating control multi-way valve for the bulldozer.

[0005] The technical solution of the utility model is: a bulldozer floating control multi-way valve, including a valve body, a first oil port, a second oil port and an oil inlet, and also includes:

[0006] A reversing valve stem is disposed in the valve body and slidably cooperates with the valve body; the reversing valve stem has a first position for controlling the bucket to be lifted, a second position for being cut off, a third position for floating, and a fourth position for controlling the bucket to shovel materials;

[0007] The pilot oil circuit is provided on the valve body;

[0008] The control valve is arranged on the valve body. The pilot oil in the pilot oil circuit enters the control oil chamber of the valve body through the control valve to control the movement of the reversing valve stem.

[0009] As an improvement of the utility model, the control valve is an electric proportional control valve.

[0010] As an improvement of the utility model, when the current of the control valve is 320-650mA, the reversing valve stem is in the third position; when the current of the control valve is 700-750mA, the reversing valve stem is in the fourth position.

[0011] As an improvement of the present invention, when the pilot pressure in the control oil chamber is 6-21 bar, the reversing valve stem is in the third position; when the pilot pressure in the control oil chamber is 24-25 bar, the reversing valve stem is in the fourth position.

[0012] As an improvement of the utility model, the control valve is a forward electric proportional pressure reducing valve.

[0013] As an improvement of the utility model, there are two control valves, each of which corresponds to a control oil chamber. The pilot oil in the pilot oil circuit enters the control oil chamber through different control valves and controls the position of the reversing valve stem.

[0014] As an improvement of the utility model, it also includes a pressure compensator, which is arranged behind the reversing valve stem. The pressure oil at the oil inlet passes through the reversing valve stem, the pressure compensator and then flows through the reversing valve stem to the first oil port or the second oil port.

[0015] As an improvement of the utility model, an oil replenishment overflow valve is provided between the reversing valve stem and the first oil port, and between the reversing valve stem and the second oil port.

[0016] As an improvement of the utility model, a limit rod is provided on the valve body, and the limit rod is inserted into the control oil cavity to limit the movement of the reversing valve stem.

[0017] The utility model has the advantages of providing a pilot oil circuit and a control valve, controlling the movement of the valve stem, achieving higher precision and control performance, more flexible and reliable control methods, and facilitating integration and automation. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0019] Attached Figure 2 It is a structural schematic diagram of the oil replenishment overflow valve according to an embodiment of the utility model.

[0020] Attached Figure 3 It is a schematic structural diagram of a pressure compensator according to an embodiment of the utility model.

[0021] Attached Figure 4 This is a hydraulic principle diagram of an embodiment of the utility model.

[0022] In the figure, 1, valve body; 2, reversing valve stem; 3, pilot oil circuit; 4, control valve; 5, control oil chamber; 6, pressure compensator; 7, oil replenishment relief valve; 8, limit rod; P, oil inlet; T, oil return port; LS, feedback oil circuit; A, first oil port; B, second oil port. DETAILED DESCRIPTION

[0023] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0024] Depend on Figure 1 Combination Figure 2-4 As shown, a bulldozer floating control multi-way valve includes a valve body 1, a first oil port A, a second oil port B, an oil inlet P, an oil return port T and a feedback oil circuit LS, and also includes:

[0025] The reversing valve stem 2 is arranged in the valve body 1 and slides with the valve body 1; the reversing valve stem 2 has a first position for controlling the bucket to be lifted, a second position for being cut off, a third position for floating, and a fourth position for controlling the bucket to shovel materials;

[0026] A pilot oil circuit 3 is provided on the valve body 1;

[0027] The control valve 4 is arranged on the valve body 1, and the pilot oil in the pilot oil circuit 3 enters the control oil chamber 5 of the valve body 1 through the control valve 4 to control the movement of the reversing valve stem 2. The beneficial effect of the utility model is that the pilot oil circuit and the control valve are arranged, and the movement of the valve stem is controlled to have higher precision and control performance, and the control method is more flexible and reliable, which is convenient for integration and automation. The utility model also has the advantages of simple structure, convenient assembly, reliable action, and long service life.

[0028] The control valve 4 is an electric proportional control valve. Specifically, the control valve 4 is a positive electric proportional pressure reducing valve. Specifically, when the current of the control valve 4 is 320-650mA, the reversing valve stem 2 is in the third position; when the current of the control valve 4 is 700-750mA, the reversing valve stem 2 is in the fourth position. More specifically, when the pilot pressure in the control oil chamber 5 is 6-21bar, the reversing valve stem 2 is in the third position; when the pilot pressure in the control oil chamber 5 is 24-25bar, the reversing valve stem 2 is in the fourth position. Compared with the mechanical limit mechanism, the utility model has the following advantages: 1. It has higher precision and control performance, and can achieve more precise control through electronic components, thereby improving the precision and control performance of the system; 2. More flexible control mode: the electronic control system can achieve multiple control modes through programming to meet different application requirements; 3. More reliable: the electronic components of the electronic control system have a longer life, are more reliable, and are more stable than mechanical control; 4. It is easy to achieve integration and automation: compared with mechanical control, electronic control is easier to achieve automation. Specifically, the reversing valve stem transitions between 650mA and 700mA, thereby avoiding unclear positions of the reversing valve stem and reducing machining accuracy requirements.

[0029] There are two control valves 4, each corresponding to a control oil chamber 5, and the pilot oil in the pilot oil circuit 3 enters the control oil chamber through different control valves 4 and controls the position of the reversing valve stem 2. In this way, both ends of the reversing valve stem can be controlled by the pilot oil, and the structure is simple.

[0030] The utility model further comprises a pressure compensator 6, which is arranged behind the reversing valve stem 2. The pressure oil of the oil inlet P passes through the reversing valve stem 2, the pressure compensator 6, and then flows through the reversing valve stem 2 to the first oil port A or the second oil port B. The feedback oil circuit and the pressure compensator cooperate with each other to make the product move more smoothly and distribute the oil reasonably.

[0031] An oil replenishment relief valve 7 is provided between the reversing valve stem 2 and the first oil port A, and between the reversing valve stem 2 and the second oil port B. When the oil replenishment relief valve is set at one oil port and oil is replenished through the oil return port, the product moves smoothly, has little impact, and is highly safe.

[0032] The valve body 1 is provided with a limit rod 8, which is inserted into the control oil chamber 5 to limit the movement of the reversing valve stem 2. Such a structure makes the reversing valve stem move smoothly and reliably, and the structure is simple. Figure 1 For example, the reversing valve stem can move 15mm to the left when it is in the middle position, and can move 11.1mm to the right when it is in the middle position. The distance of the valve stem can be controlled by the electric proportional pressure reducing valve.

[0033] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0035] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A bulldozer floating control multi-way valve, comprising a valve body (1), a first oil port (A), a second oil port (B) and an oil inlet (P), characterized in that Also included: A reversing valve stem (2); arranged in the valve body (1) and slidably engaged with the valve body (1); the reversing valve stem (2) has a first position for controlling the bucket to be lifted, a second position for being cut off, a third position for floating, and a fourth position for controlling the bucket to shovel materials; A pilot oil circuit (3) is provided on the valve body (1); The control valve (4) is arranged on the valve body (1), and the pilot oil in the pilot oil circuit (3) enters the control oil chamber (5) of the valve body (1) through the control valve (4) to control the movement of the reversing valve stem (2).

2. A bulldozer floating control multi-way valve according to claim 1, characterized in that The control valve (4) is an electric proportional control valve.

3. A bulldozer floating control multi-way valve according to claim 2, characterized in that When the current of the control valve (4) is 320-650 mA, the reversing valve stem (2) is in the third position; when the current of the control valve (4) is 700-750 mA, the reversing valve stem (2) is in the fourth position.

4. A bulldozer floating control multi-way valve according to claim 1 or 3, characterized in that When the pilot pressure in the control oil chamber (5) is 6-21 bar, the reversing valve stem (2) is in the third position; when the pilot pressure in the control oil chamber (5) is 24-25 bar, the reversing valve stem (2) is in the fourth position.

5. The bulldozer floating control multi-way valve according to claim 1, characterized in that The control valve (4) is a positive electric proportional pressure reducing valve.

6. The bulldozer floating control multi-way valve according to claim 1, characterized in that There are two control valves (4), each control valve (4) is provided corresponding to a control oil chamber (5), and the pilot oil in the pilot oil circuit (3) enters the control oil chamber through different control valves (4) and controls the position of the reversing valve stem (2).

7. The bulldozer floating control multi-way valve according to claim 1, characterized in that It also includes a pressure compensator (6), which is arranged behind the reversing valve stem (2). The pressure oil at the oil inlet (P) passes through the reversing valve stem (2), the pressure compensator (6), and then flows through the reversing valve stem (2) to the first oil port (A) or the second oil port (B).

8. The bulldozer floating control multi-way valve according to claim 1, characterized in that An oil replenishment overflow valve (7) is provided between the reversing valve stem (2) and the first oil port (A), and between the reversing valve stem (2) and the second oil port (B).

9. The bulldozer floating control multi-way valve according to claim 1, characterized in that The valve body (1) is provided with a limit rod (8), and the limit rod (8) is inserted into the control oil chamber (5) to limit the movement of the reversing valve stem (2).

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