Feeding hydraulic system and construction machinery

Abstract

The utility model belongs to the technical field of engineering machinery, and specifically relates to a material conveying hydraulic system and engineering machinery. The material conveying hydraulic system comprises an oil tank (1), a material conveying pump (2), a flow priority valve (3), an unloading valve (4) and a material conveying motor (5). The unloading valve (4) is arranged on the oil circuit between the material conveying pump (2) and the flow priority valve (3). The oil inlet of the unloading valve (4) and the oil outlet of the unloading valve (4) can be selectively connected or cut off. When the material conveying motor (5) is not working, the system can unload the hydraulic system circuit through the unloading valve (4). Compared with the solution of unloading by relying on the flow priority valve (3) in the prior art, the control of the utility model is simpler and energy-saving.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a material conveying hydraulic system and an engineering machinery comprising the material conveying hydraulic system. Background Art

[0002] The utility model patent with application number "201620259621.6" discloses a feeding drive system and a paving machine, wherein the feeding drive system includes: an oil tank, a feeding pump, an electromagnetic reversing valve, a feeding motor and a flow regulating device; the oil inlet of the feeding pump is connected to the oil tank; the oil inlet of the electromagnetic reversing valve is connected to the oil outlet of the feeding pump, and the two oil inlets and outlets of the feeding motor are respectively connected to the two working oil ports of the electromagnetic reversing valve; the flow regulating device is arranged in the oil inlet or oil outlet oil circuit of the feeding motor, and the flow regulating device is provided with a priority outlet and an oil drain port, and the oil drain port is used to adjust the flow of the hydraulic oil passing through the priority outlet, thereby controlling the flow of the hydraulic oil passing through the feeding motor. The feeding drive system provided by the above patent technology has a certain amount of energy loss by controlling the priority valve for unloading. Therefore, for those skilled in the art, how to provide a feeding hydraulic system with a new structure to improve the technical problems in the above patent technology has a more realistic significance. Utility Model Content

[0003] In view of this, in order to improve at least one of the above problems existing in the prior art, the utility model provides a material conveying hydraulic system and an engineering machine including the material conveying hydraulic system.

[0004] The first aspect of the utility model provides a material conveying hydraulic system, comprising:

[0005] tank;

[0006] A feed pump, wherein the oil inlet of the feed pump is connected to the oil tank;

[0007] A flow priority valve, wherein the oil inlet of the flow priority valve is connected to the oil outlet of the feed pump, and the oil drain port of the flow priority valve is connected to the oil tank;

[0008] An unloading valve, wherein the oil inlet of the unloading valve is connected to the oil path between the oil inlet of the flow priority valve and the oil outlet of the feed pump, the oil outlet of the unloading valve is connected to the oil tank, and the oil inlet of the unloading valve and the oil outlet of the unloading valve are selectively connected or cut off;

[0009] The feed motor, the priority oil port of the flow priority valve is connected to the oil inlet of the feed motor, and the oil outlet of the feed motor is connected to the oil tank.

[0010] In a feasible implementation, the unloading valve is a two-position two-way reversing valve.

[0011] In a feasible implementation, a relief valve is included, the oil inlet of the relief valve is connected to the oil circuit between the oil inlet of the flow priority valve and the oil outlet of the feed pump, and the oil outlet of the relief valve is connected to the oil tank.

[0012] In a feasible implementation, the connection position of the oil circuit between the oil inlet of the overflow valve and the oil inlet of the flow priority valve and the oil outlet of the feed pump is located between the connection position of the oil circuit between the oil inlet of the unloading valve and the oil inlet of the flow priority valve and the oil outlet of the feed pump and the oil inlet of the flow priority valve.

[0013] In a feasible implementation, it includes an integrated valve body, and the flow priority valve, the unloading valve and the overflow valve are all arranged on the integrated valve body.

[0014] In a feasible implementation, the oil outlet of the unloading valve, the oil outlet of the overflow valve, the oil drain port of the flow priority valve, the oil outlet of the feeding motor and the oil drain port of the feeding motor are connected to the oil tank after converging.

[0015] In a feasible implementation, the feed motor is a quantitative motor, and the feed pump is a quantitative pump.

[0016] In a feasible implementation, the unloading valve is a solenoid valve, and the flow priority valve is a solenoid valve; when the unloading valve loses power, the oil inlet of the unloading valve and the oil outlet of the unloading valve are connected, and the flow priority valve loses power; when the unloading valve is energized, the oil inlet of the unloading valve and the oil outlet of the unloading valve are cut off, and the flow priority valve is energized.

[0017] The second technical solution of the utility model further provides an engineering machinery, comprising the material conveying hydraulic system of any one of the above-mentioned first aspects.

[0018] In a feasible implementation, the engineering machinery is a paver or a milling machine.

[0019] The beneficial effects of the above technical solution of the utility model are:

[0020] The feed hydraulic system of the utility model comprises an oil tank, a feed pump, a flow priority valve, an unloading valve and a feed motor. The unloading valve is arranged on the oil circuit between the feed pump and the flow priority valve. The oil inlet of the unloading valve and the oil outlet of the unloading valve can be selectively connected or cut off. When the feed motor is not working, the system can unload the hydraulic system circuit through the unloading valve. Compared with the solution of relying on the flow priority valve for unloading in the prior art, the control of the utility model is simpler and more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a structural schematic diagram of a material conveying hydraulic system provided by an embodiment of the utility model.

[0022] Figure 2 Shown is a structural schematic diagram of a material conveying hydraulic system provided by an embodiment of the utility model.

[0023] Figure 3 Shown is a schematic structural diagram of an engineering machinery provided by an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1 oil tank, 2 feed pump, 3 flow priority valve, 4 unloading valve, 5 feed motor, 6 overflow valve. DETAILED DESCRIPTION

[0026] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0027] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Some embodiments of the material conveying hydraulic system and the engineering machinery including the material conveying hydraulic system in the technical solution of the utility model are provided below.

[0030] like Figure 1 and Figure 2 As shown, in an embodiment of the first aspect of the utility model, a feed hydraulic system is provided, comprising: an oil tank 1; a feed pump 2, the oil inlet of the feed pump 2 is connected to the oil tank 1; a flow priority valve 3, the oil inlet of the flow priority valve 3 is connected to the oil outlet of the feed pump 2, and the oil drain port of the flow priority valve 3 is connected to the oil tank 1; an unloading valve 4, the oil inlet of the unloading valve 4 is connected to the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feed pump 2, the oil outlet of the unloading valve 4 is connected to the oil tank 1, and the oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 are selectively connected or cut off; a feed motor 5, the priority oil port of the flow priority valve 3 is connected to the oil inlet of the feed motor 5, and the oil outlet of the feed motor 5 is connected to the oil tank 1.

[0031] Among them, the unloading valve 4 has an unloading position and a non-unloading position. In the unloading position, the oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 are connected, and the pressure oil pumped out of the oil outlet of the feed pump 2 returns to the oil tank 1 through the unloading valve 4, and the feed motor 5 does not work; in the non-unloading position, the oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 are cut off, and the pressure oil pumped out of the oil outlet of the feed pump 2 enters the feed motor 5 through the flow priority valve 3 to realize the feeding action.

[0032] It can be seen from the above content that the feeding hydraulic system of the utility model includes an oil tank 1, a feeding pump 2, a flow priority valve 3, an unloading valve 4 and a feeding motor 5. The unloading valve 4 is arranged on the oil circuit between the feeding pump 2 and the flow priority valve 3. The oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 can be selectively connected or cut off. When the feeding motor 5 is not working, the system can unload the hydraulic system circuit through the unloading valve 4. Compared with the solution of relying on the flow priority valve 3 for unloading in the prior art, the control of the utility model is simpler and energy-saving.

[0033] In some embodiments of the present utility model, the unloading valve 4 is a two-position two-way reversing valve. Using a two-position two-way reversing valve as the unloading valve 4 has high control accuracy and simple control logic.

[0034] In some embodiments of the present invention, Figure 2As shown, it includes a relief valve 6, the oil inlet of the relief valve 6 is connected to the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feed pump 2, and the oil outlet of the relief valve 6 is connected to the oil tank 1. The setting of the relief valve 6 plays a role of constant pressure overflow, plays a role of safety protection for system pressure stabilization and unloading, and plays a role of pressure maintenance for the entire hydraulic system including the feed pump 2. Preferably, the connection position of the oil inlet of the relief valve 6 connecting the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feed pump 2 is located between the connection position of the oil inlet of the unloading valve 4 connecting the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feed pump 2 and the oil inlet of the flow priority valve 3, that is, relative to the position of the unloading valve 4, the position of the relief valve 6 is closer to the feed motor 5, so that the setting optimizes the hydraulic system circuit, and the relief valve 6 is arranged before the flow priority valve 3, which can perform pressure protection on the entire circuit including the pump.

[0035] In some embodiments of the utility model, an integrated valve body is included, and the flow priority valve 3, the unloading valve 4 and the overflow valve 6 are all arranged on the integrated valve body. The flow priority valve 3, the unloading valve 4 and the overflow valve 6 constitute a material feeding control valve group. The flow priority valve 3, the unloading valve 4 and the overflow valve 6 are integrated to optimize the layout and reduce space occupancy.

[0036] In some embodiments of the utility model, the oil outlet of the unloading valve 4, the oil outlet of the relief valve 6, the oil drain port of the flow priority valve 3, the oil outlet of the feeding motor 5 and the oil drain port of the feeding motor 5 are merged and connected to the oil tank 1. The oil outlet of the unloading valve 4, the oil outlet of the relief valve 6, the oil drain port of the flow priority valve 3, the oil outlet of the feeding motor 5 and the oil drain port of the feeding motor 5 are merged. In this way, oil can be returned to the oil tank 1 through the same oil circuit, thereby reducing the use of oil pipelines and reducing costs.

[0037] In some embodiments of the present invention, the feed motor 5 is a quantitative motor, and the feed pump 2 is a quantitative pump. The use of a quantitative motor and a quantitative pump can reduce the cost of implementing the system. Specifically, the feed pump 2 is optionally a gear pump.

[0038] In some embodiments of the utility model, the unloading valve 4 is a solenoid valve, and the flow priority valve 3 is a solenoid valve; when the unloading valve 4 loses power, the oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 are connected, and the flow priority valve 3 loses power; when the unloading valve 4 is energized, the oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 are cut off, and the flow priority valve 3 is energized. When not working, the unloading valve 4 and the flow priority valve 3 are not energized, and the system oil returns to the oil tank 1 directly through the unloading valve 4; when working, the unloading valve 4 and the flow priority valve 3 are energized, and the purpose of energy saving can be achieved by the scheme of synchronizing the unloading valve 4 and the flow priority valve 3 to be energized and de-energized.

[0039] In summary, the feed hydraulic system of the utility model comprises an oil tank 1, a feed pump 2, a flow priority valve 3, an unloading valve 4 and a feed motor 5. The unloading valve 4 is arranged on the oil circuit between the feed pump 2 and the flow priority valve 3. The oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 can be selectively connected or cut off. When the feed motor 5 is not working, the system can unload the hydraulic system circuit through the unloading valve 4. Compared with the solution of relying on the flow priority valve 3 for unloading in the prior art, the control of the utility model is simpler and more energy-saving.

[0040] like Figure 3 As shown, in the embodiment of the second aspect of the utility model, an engineering machine is also provided, which can be a paver or a milling machine, and the engineering machine includes the material conveying hydraulic system in any embodiment of the first aspect. Since the engineering machine has the material conveying hydraulic system, the engineering machine has all the technical effects of the material conveying hydraulic system, which will not be elaborated in detail here.

[0041] In some embodiments of the utility model, the engineering machinery is a milling machine, including an engine, a fuel tank 1, a feed pump 2, a flow priority valve 3, a unloading valve 4, a relief valve 6 and a feed motor 5, wherein the unloading valve 4 is a solenoid valve, the flow priority valve 3 is a proportional solenoid valve, and the controller is respectively communicated with the engine, the unloading valve 4 and the flow priority valve 3. Specifically, optionally, the controller can be communicated with the engine ECU to obtain the load rate and speed of the engine. The oil inlet of the feed pump 2 is connected to the fuel tank 1, the oil inlet of the flow priority valve 3 is connected to the oil outlet of the feed pump 2, and the oil drain port of the flow priority valve 3 is connected to the fuel tank 1; the oil inlet of the unloading valve 4 is connected to the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feed pump 2, and the oil outlet of the unloading valve 4 is connected to the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feed pump 2. The port is connected to the oil tank 1, and the oil inlet of the unloading valve 4 and the oil outlet of the unloading valve 4 are selectively connected or cut off; the feeding motor 5, the priority oil port of the flow priority valve 3 is connected to the oil inlet of the feeding motor 5, and the oil outlet of the feeding motor 5 is connected to the oil tank 1, the oil inlet of the relief valve 6 is connected to the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feeding pump 2, the oil outlet of the relief valve 6 is connected to the oil tank 1, and the connection position of the oil inlet of the relief valve 6 connected to the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feeding pump 2 is located between the connection position of the oil inlet of the unloading valve 4 connecting the oil circuit between the oil inlet of the flow priority valve 3 and the oil outlet of the feeding pump 2 and the oil inlet of the flow priority valve 3. The oil outlet of the unloading valve 4 , the oil outlet of the overflow valve 6 , the oil drain port of the flow priority valve 3 , the oil outlet of the feeding motor 5 and the oil drain port of the feeding motor 5 are connected to the oil tank 1 after converging.

[0042] The feed pump 2 draws oil from the oil tank 1 to the feed control valve group. When the feed motor 5 is not working, the hydraulic oil returns to the oil tank 1 through the unloading valve 4; when the feed motor 5 is working, the unloading valve 4 is energized, and the hydraulic oil enters the feed motor 5 through the flow priority valve 3 to realize the feeding action; the feed speed can be adjusted in real time through the electric proportional flow priority valve 3, and the overflow valve 6 serves as a system safety valve.

[0043] When not working, the unloading valve 4 and the flow priority valve 3 are not energized, and the system oil returns to the oil tank 1 directly through the unloading valve 4; when working, the unloading valve 4 is energized, and the control current of the flow priority valve 3 is adjusted according to the load rate of the whole machine, and the appropriate feeding speed is matched to achieve the purpose of energy saving; when the engine is running at high speed or light load, the current of the flow priority valve 3 is adjusted to reduce the feeding speed, so as to avoid the canvas of the milling machine being damaged due to excessive feeding speed. The highly integrated feeding speed of the utility model is adjustable, which fills the gap of the current small milling machine market where the feeding speed cannot be adjusted. Compared with similar existing technologies, the control of the utility model is simpler, more energy-saving and the system safety performance is improved.

[0044] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0045] The block diagrams of the devices, apparatuses, equipment and systems involved in the present utility model are only illustrative examples and are not intended to require or imply that they must be connected, arranged and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment and systems can be connected, arranged and configured in any manner. Words such as "including", "comprising", "having" and the like are open words, referring to "including but not limited to" and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to" and can be used interchangeably with them. It should also be noted that in the apparatus and equipment of the present utility model, each component can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present utility model.

[0046] The utility model provides the above description of the disclosed aspects to enable any person skilled in the art to make or use the utility model. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the utility model. Therefore, the utility model is not intended to be limited to the aspects shown herein, but in accordance with the widest range consistent with the principles and novel features of this utility model.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A material conveying hydraulic system, characterized in that: include: Fuel tank (1); A feed pump (2), wherein an oil inlet of the feed pump (2) is connected to the oil tank (1); A flow priority valve (3), wherein the oil inlet of the flow priority valve (3) is connected to the oil outlet of the feed pump (2), and the oil drain port of the flow priority valve (3) is connected to the oil tank (1); An unloading valve (4), wherein the oil inlet of the unloading valve (4) is connected to the oil path between the oil inlet of the flow priority valve (3) and the oil outlet of the feed pump (2), the oil outlet of the unloading valve (4) is connected to the oil tank (1), and the oil inlet of the unloading valve (4) and the oil outlet of the unloading valve (4) are selectively connected or cut off; A feeding motor (5), wherein the priority oil port of the flow priority valve (3) is connected to the oil inlet of the feeding motor (5), and the oil outlet of the feeding motor (5) is connected to the oil tank (1).

2. The material delivery hydraulic system according to claim 1, characterized in that: The unloading valve (4) is a two-position two-way reversing valve.

3. The material delivery hydraulic system according to claim 1, characterized in that: It comprises an overflow valve (6), the oil inlet of the overflow valve (6) is connected to the oil path between the oil inlet of the flow priority valve (3) and the oil outlet of the feed pump (2), and the oil outlet of the overflow valve (6) is connected to the oil tank (1).

4. The material delivery hydraulic system according to claim 3, characterized in that: The connection position of the oil circuit between the oil inlet of the overflow valve (6) and the oil inlet of the flow priority valve (3) and the oil outlet of the feed pump (2) is located between the connection position of the oil circuit between the oil inlet of the unloading valve (4) and the oil inlet of the flow priority valve (3) and the oil outlet of the feed pump (2) and the oil inlet of the flow priority valve (3).

5. The material delivery hydraulic system according to claim 3, characterized in that: It comprises an integrated valve body, on which the flow priority valve (3), the unloading valve (4) and the overflow valve (6) are all arranged.

6. The material delivery hydraulic system according to claim 3, characterized in that: The oil outlet of the unloading valve (4), the oil outlet of the overflow valve (6), the oil drain port of the flow priority valve (3), the oil outlet of the feeding motor (5) and the oil drain port of the feeding motor (5) are connected to the oil tank (1) after converging.

7. The material conveying hydraulic system according to any one of claims 1 to 6, characterized in that: The feed motor (5) is a quantitative motor, and the feed pump (2) is a quantitative pump.

8. The material conveying hydraulic system according to any one of claims 1 to 6, characterized in that: The unloading valve (4) is a solenoid valve, and the flow priority valve (3) is a solenoid valve; when the unloading valve (4) loses power, the oil inlet of the unloading valve (4) and the oil outlet of the unloading valve (4) are connected, and the flow priority valve (3) loses power; when the unloading valve (4) is energized, the oil inlet of the unloading valve (4) and the oil outlet of the unloading valve (4) are blocked, and the flow priority valve (3) is energized.

9. An engineering machine, characterized in that: It comprises a material conveying hydraulic system as described in any one of claims 1 to 8.

10. The construction machine according to claim 9, characterized in that: The engineering machinery is a paver or a milling machine.

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