CN218913311U - Front loading hydraulic control system and tractor - Google Patents

Abstract

The utility model relates to a front loading hydraulic control system and a tractor, wherein the hydraulic control system comprises a movable arm, a bucket and a multi-way valve block, wherein a total oil inlet, a total oil return port, a first oil receiving port, a second oil receiving port, a third oil receiving port and a fourth oil receiving port are arranged on the multi-way valve block, the total oil inlet can be communicated with the first oil receiving port and/or the third oil receiving port, and the total oil return port can be communicated with the second oil receiving port and/or the fourth oil receiving port; the oil receiving port I is communicated with the rodless cavity of the movable arm through a pipeline I, and the oil receiving port II is communicated with the rod cavity of the movable arm through a pipeline II; the oil receiving port three is communicated with the rodless cavity of the bucket through a pipeline three, and the oil receiving port four is communicated with the rod cavity of the bucket through a pipeline four. The utility model has the advantages of simple structure, reasonable design, good coordination, and can realize the selection and simultaneous action of the movable arm and the bucket, and the adjustment of the bucket speed, so as to meet different operation demands, and is convenient to use.

Description

Front loading hydraulic control system and tractor

Technical Field

The utility model relates to the technical field of tractors, in particular to a front loading hydraulic control system and a tractor.

Background

Front loading is configured on the tractor, and actions of a front loading movable arm and a bucket are controlled through a hydraulic multi-way valve: the movable arm rises, descends, floats, and the bucket is retracted and tipping bucket.

The prior multi-way valve for the front loading configuration of the tractor can control the lifting, descending and floating of the movable arm and the bucket to retract and dump, but the movable arm and the bucket can only act independently or have poor coordination when simultaneously acting; furthermore, the valves controlling the bucket are three-position valves, and the bucket is tipped forward at only one speed.

Disclosure of Invention

The utility model aims to solve the technical problem in the prior art by providing a front loading hydraulic control system and a tractor.

The technical scheme for solving the technical problems is as follows:

the front loading hydraulic control system comprises a movable arm, a bucket and a multi-way valve block, wherein a total oil inlet, a total oil return port, a first oil receiving port, a second oil receiving port, a third oil receiving port and a fourth oil receiving port are arranged on the multi-way valve block, the total oil inlet can be communicated with the first oil receiving port and/or the third oil receiving port, and the total oil return port can be communicated with the second oil receiving port and/or the fourth oil receiving port;

the first oil receiving port is communicated with the rodless cavity of the movable arm through a first pipeline, and the second oil receiving port is communicated with the rod cavity of the movable arm through a second pipeline; the oil receiving port three is communicated with the rodless cavity of the bucket through a pipeline III, and the oil receiving port four is communicated with the rod cavity of the bucket through a pipeline IV.

The beneficial effects of the utility model are as follows: during operation, the lifting and the lowering of the movable arm are realized by switching the communication relation among the total oil inlet, the total oil return port, the first oil receiving port, the second oil receiving port, the third oil receiving port and the fourth oil receiving port on the multi-way valve block, meanwhile, the tipping bucket and the bucket receiving of the bucket can be realized, and the speed of the tipping bucket of the bucket can be adjusted; in addition, the actions of the movable arm and the bucket can be performed singly or simultaneously, the operation is convenient, different requirements of users can be met, and the use is convenient.

The utility model has simple structure and reasonable design, can realize the alternative and simultaneous actions of the movable arm and the bucket, has good coordination, can realize the adjustment of the bucket speed, meets different operation demands, and is convenient to use.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, the multi-way valve block comprises a movable arm multi-way valve and a bucket multi-way valve, the first oil receiving port and the second oil receiving port are respectively positioned on the movable arm multi-way valve, and the movable arm multi-way valve is also provided with a movable arm oil inlet and a movable arm oil return port; the movable arm oil inlet can be communicated with the oil receiving port I and the movable arm oil return port II, or the movable arm oil inlet can be communicated with the oil receiving port II and the movable arm oil return port I;

the third oil receiving port and the fourth oil receiving port are respectively positioned on the bucket multi-way valve, and the bucket multi-way valve is also provided with a bucket oil inlet and a bucket oil return port; the bucket oil inlet can be communicated with the oil receiving third and the bucket oil return port can be communicated with the oil receiving fourth, or the bucket oil inlet can be communicated with the oil receiving fourth and the bucket oil return port can be communicated with the oil receiving fourth;

the movable arm oil inlet and the bucket oil inlet form the total oil inlet, and the movable arm oil return port and the bucket oil return port form the total oil return port.

The beneficial effect of adopting the further scheme is that when in operation, the lifting and the lowering of the movable arm are realized by switching the communication relation among the movable arm oil inlet, the movable arm oil return opening, the first oil receiving opening and the second oil receiving opening on the movable arm multi-way valve;

meanwhile, through switching the communication relation among a bucket oil inlet, a bucket oil return port, a third oil receiving port and a fourth oil receiving port on the bucket multi-way valve, the tipping bucket and the receiving bucket of the bucket are realized, and the speed of the tipping bucket of the bucket can be adjusted;

in addition, through controlling the action of the movable arm multi-way valve and the bucket multi-way valve, the actions of the movable arm and the bucket can be singly carried out, and the movable arm multi-way valve and the bucket multi-way valve can also be simultaneously carried out, so that the movable arm multi-way valve is convenient to operate, can meet different requirements of users, and is convenient to use.

Further, quick-change connectors are respectively arranged on the first pipeline and/or the second pipeline and/or the third pipeline and/or the fourth pipeline.

The movable arm and bucket quick-mounting and dismounting device has the beneficial effects of simple structure, reasonable design, simplicity and convenience in operation, time saving and labor saving, and can realize quick-mounting and dismounting of the movable arm and bucket through the quick-change connector.

Further, the movable arm multi-way valve and/or the bucket multi-way valve are/is three-position four-way valves.

The valve has the beneficial effects of simple structure and reasonable valve selection, so as to realize different functions and meet different production requirements.

Further, the movable arm oil inlet and the bucket oil inlet are respectively communicated with an oil return pipeline through pipelines.

The oil recovery device has the beneficial effects that the structure is simple, the design is reasonable, the recovery of oil in the operation process can be realized through the oil return pipeline, the oil is saved, the cost is reduced, and meanwhile, the pipeline is simplified.

Further, the movable arm oil return port and the bucket oil return port are respectively communicated with an oil inlet pipeline through pipelines.

The oil feeding device has the beneficial effects that the structure is simple, the design is reasonable, oil can be simultaneously fed into the movable arm and the bucket through the oil feeding pipeline, the oil is convenient to convey, and the pipeline is simplified.

Further, the oil inlet pipeline is communicated with the oil return pipeline through a safety pipeline, and a safety valve is fixedly arranged on the safety pipeline.

The beneficial effect of adopting above-mentioned further scheme is simple structure, reasonable in design, when the pressure in the system is too big, opens the relief valve this moment, and unnecessary fluid accessible safety line on the oil feed pipeline returns oil line simultaneously, guarantees system operation safety.

Further, the oil tank is further arranged, one end of the oil inlet pipeline and one end of the oil return pipeline are respectively communicated with the oil tank, and an oil pump is fixedly arranged on the oil inlet pipeline.

The oil tank has the beneficial effects that when the system is operated, on one hand, the oil stored in the oil tank can be sent into the system through the oil pump so as to ensure the normal operation of the system; on the other hand, the oil in the system operation returns through the oil return pipeline, so that the recycling of the oil is realized, the oil is saved, and the cost is reduced.

Further, the oil inlet pipeline is fixedly provided with a one-way valve corresponding to the movable arm oil inlet and/or the bucket oil inlet respectively.

The beneficial effect of adopting above-mentioned further scheme is simple structure, reasonable in design, guarantees the flow direction of fluid.

A tractor comprising a front load hydraulic control system as described above.

The tractor has the beneficial effects that the tractor is simple in structure, reasonable in design, good in coordination, capable of realizing one-choice and simultaneous action of the movable arm and the bucket, and capable of realizing adjustment of the bucket speed so as to meet different operation requirements, and convenient to use.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the structure of the present utility model with the boom raised and the bucket not in operation;

FIG. 3 is a schematic view of the boom down and bucket not in operation in accordance with the present utility model;

FIG. 4 is a schematic view of the structure of the present utility model with the boom floating and the bucket not in operation;

FIG. 5 is a schematic view of the structure of the present utility model with the bucket in the fast dump position and the boom not in operation;

FIG. 6 is a schematic view of the structure of the present utility model with the bucket slowing skip and boom not in operation;

fig. 7 is a schematic view of the structure of the bucket in the present utility model when the boom is not in operation.

In the drawings, the list of components represented by the various numbers is as follows:

1. a movable arm; 2. a bucket; 3. a boom multiplex valve; 4. bucket multiway valve; 5. a quick-change joint; 6. an oil return pipeline; 7. an oil inlet pipeline; 8. a safety pipeline; 9. a safety valve; 10. a one-way valve; 11. and an oil supply pipeline.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

As shown in fig. 1, the embodiment provides a front loading hydraulic control system, which comprises a movable arm 1, a bucket 2 and a multi-way valve block, wherein the multi-way valve block is provided with a total oil inlet, a total oil return port, a first oil receiving port, a second oil receiving port, a third oil receiving port and a fourth oil receiving port, the total oil inlet can be communicated with the first oil receiving port and/or the third oil receiving port, and the total oil return port can be communicated with the second oil receiving port and/or the fourth oil receiving port;

the first oil receiving port is communicated with the rodless cavity of the movable arm 1 through a first pipeline, and the second oil receiving port is communicated with the rod cavity of the movable arm 1 through a second pipeline; the oil receiving port III is communicated with the rodless cavity of the bucket 2 through a pipeline III, and the oil receiving port IV is communicated with the rod cavity of the bucket 2 through a pipeline IV.

During operation, the lifting and the lowering of the movable arm 1 are realized by switching the communication relation among the total oil inlet, the total oil return port, the first oil receiving port, the second oil receiving port, the third oil receiving port and the fourth oil receiving port on the multi-way valve block, meanwhile, the tipping bucket and the receiving bucket of the bucket 2 can be realized, and the tipping speed of the bucket 2 can be adjusted; in addition, the actions of the movable arm 1 and the bucket 2 can be performed singly or simultaneously, so that the operation is convenient, different requirements of users can be met, and the use is convenient.

The boom 1 and the bucket 2 are cylinders.

The movable arm and bucket 2 adjusting device is simple in structure, reasonable in design, capable of achieving one of the movable arm 1 and the bucket 2 and simultaneous movement, good in coordination, capable of achieving speed adjustment of the bucket 2, and convenient to use and capable of meeting different operation requirements.

Example 2

Based on embodiment 1, in this embodiment, the multiple-way valve block includes a movable arm multiple-way valve 3 and a bucket multiple-way valve 4, the oil receiving port I and the oil receiving port II are respectively located on the movable arm multiple-way valve 3, and the movable arm multiple-way valve 3 is further provided with a movable arm oil inlet and a movable arm oil return port; the movable arm oil inlet can be communicated with the oil receiving port and the movable arm oil return port can be communicated with the oil receiving port II, or the movable arm oil inlet can be communicated with the oil receiving port II and the movable arm oil return port can be communicated with the oil receiving port I;

the oil receiving port III and the oil receiving port IV are respectively positioned on the bucket multi-way valve 4, and the bucket multi-way valve 4 is also provided with a bucket oil inlet and a bucket oil return port; the bucket oil inlet can be communicated with the oil receiving third and the bucket oil return port can be communicated with the oil receiving fourth, or the bucket oil inlet can be communicated with the oil receiving fourth and the bucket oil return port can be communicated with the oil receiving fourth;

the movable arm oil inlet and the bucket oil inlet form a total oil inlet, and the movable arm oil return port and the bucket oil return port form a total oil return port.

During operation, the lifting and the lowering of the movable arm 1 are realized by switching the communication relation among the movable arm oil inlet, the movable arm oil return opening, the first oil receiving opening and the second oil receiving opening on the movable arm multi-way valve 3;

meanwhile, through switching the communication relation among the bucket oil inlet, the bucket oil return port, the oil receiving port III and the oil receiving port IV on the bucket multiway valve 4, the tipping bucket and the bucket collecting of the bucket are realized, and the tipping bucket speed of the bucket 2 can be adjusted;

in addition, through controlling the movements of the movable arm multi-way valve 3 and the bucket multi-way valve 4, the movements of the movable arm 1 and the bucket 2 can be carried out singly or simultaneously, the operation is convenient, the different demands of users can be met, and the use is convenient.

Example 3

On the basis of embodiment 2, in this embodiment, the quick-change connectors 5 are respectively installed on the first pipeline and/or the second pipeline and/or the third pipeline and/or the fourth pipeline.

This scheme simple structure, reasonable in design can realize the quick assembly disassembly of movable arm 1 and scraper bowl 2 through quick change joint 5, and is easy and simple to handle, labour saving and time saving.

Based on the above scheme, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline can be all provided with the quick-change connector 5, and can also be partially provided with the quick-change connector 5.

Preferably, in this embodiment, the first pipeline and/or the second pipeline and/or the third pipeline and/or the fourth pipeline are divided into two sections of pipelines, one ends of the two sections of pipelines, which are far away from each other, are respectively communicated with the corresponding oil receiving port and the corresponding cavity of the movable arm 1 or the bucket 2, each quick-change connector 5 is located between one ends of the corresponding two sections of pipelines, which are close to each other, and two ends of each quick-change connector are respectively detachably connected with one ends of the two sections of pipelines, which are close to each other, so that the quick-change connector is convenient to disassemble and assemble.

Example 4

In this embodiment, the boom multiple valve 3 and/or the bucket multiple valve 4 are three-position four-way valves, based on any one of embodiments 2 to 3.

The scheme has simple structure and reasonable valve selection, and realizes different functions, thereby meeting different production requirements.

Example 5

In this embodiment, the boom oil inlet and the bucket oil inlet are respectively communicated with the oil return line 6 through lines on the basis of any one of embodiments 2 to 4.

This scheme simple structure, reasonable in design can realize the recovery of operation in-process fluid through return line 6, practices thrift fluid, reduce cost, has simplified the pipeline simultaneously.

Example 6

On the basis of embodiment 5, in this embodiment, the boom return port and the bucket return port are respectively communicated with the oil intake pipe 7 through pipes.

This scheme simple structure, reasonable in design can send the fluid simultaneously to in swing arm 1 and the scraper bowl 2 through advance oil pipe 7, and the fluid is carried conveniently, and has simplified the pipeline.

Preferably, in this embodiment, the portion of the oil inlet line 7 corresponding to the bucket oil inlet of the bucket multiway valve 4 is further connected to one end of the oil supply line 11, and the other end of the oil supply line 11 is used for connecting to an external device such as a lifter. When the valve cores of the movable arm multi-way valve 3 and the bucket multi-way valve 4 are in the middle position, namely, the movable arm 1 and the bucket 2 do not act, oil in the whole system can supply oil to external equipment at the moment, and the functions are various.

Example 7

In this embodiment, the oil inlet pipe 7 and the oil return pipe 6 are communicated through a safety pipe 8, and a safety valve 9 is fixedly installed on the safety pipe 8.

This scheme simple structure, reasonable in design opens relief valve 9 this moment when the pressure in the system is too big, and unnecessary fluid accessible safety line 8 and oil return line 6 on the oil feed pipeline 7 return oil simultaneously, guarantees system operation safety.

Example 8

The present embodiment further includes an oil tank, one end of the oil inlet pipe 7 and one end of the oil return pipe 6 are respectively communicated with the oil tank, and an oil pump is fixedly installed on the oil inlet pipe 7.

When the system is operated, on one hand, oil stored in the oil tank can be sent into the system through the oil pump so as to ensure the normal operation of the system; on the other hand, the oil in the system operation returns through the oil return pipeline, so that the recycling of the oil is realized, the oil is saved, and the cost is reduced.

In addition to the above embodiment, one end of the oil return line 6 may not be connected to the oil tank, and the returned oil may be directly discharged, but this solution may cause oil waste.

Preferably, in this embodiment, a filter is fixedly installed at a position of the oil inlet pipeline 7 close to the outlet of the oil pump, and the filter can remove impurities in the oil, so that the impurities in the oil are prevented from affecting the working performance of each component.

Example 9

In this embodiment, the one-way valve 10 is fixedly installed in the oil inlet pipe 7 corresponding to the boom oil inlet and/or the bucket oil inlet, respectively, on the basis of any one of embodiments 6 to 8.

This scheme simple structure, reasonable in design guarantees the flow direction of fluid.

Preferably, in this embodiment, each of the check valves 10 is preferably a solenoid valve, and each solenoid valve is connected to the controller through a circuit.

Example 10

On the basis of the above embodiments, the present embodiment also provides a tractor including the front loading hydraulic control system as described above.

The embodiment provides a tractor, and this tractor simple structure, reasonable in design can realize that movable arm 1 and scraper bowl 2 select one and action simultaneously, and the harmony is good, and can realize the regulation of scraper bowl 2 speed to satisfy different operation demands, convenient to use.

The working principle of the utility model is as follows:

during operation, the lifting and the lowering of the movable arm 1 are realized by switching the communication relation among the movable arm oil inlet, the movable arm oil return opening, the first oil receiving opening and the second oil receiving opening on the movable arm multi-way valve 3;

meanwhile, through switching the communication relation among the bucket oil inlet, the bucket oil return port, the oil receiving port III and the oil receiving port IV on the bucket multiway valve 4, the tipping bucket and the bucket collecting of the bucket are realized, and the tipping bucket speed of the bucket 2 can be adjusted;

in addition, through controlling the movements of the movable arm multi-way valve 3 and the bucket multi-way valve 4, the movements of the movable arm 1 and the bucket 2 can be carried out singly or simultaneously, the operation is convenient, the different demands of users can be met, and the use is convenient.

The method comprises the following steps:

as shown in fig. 2, the movable arm lifting action is shown, hydraulic oil enters from the main oil inlet, passes through the movable arm multi-way valve lifting position, the quick-change connector enters into the large cavity (i.e. the rodless cavity) of the movable arm oil cylinder, hydraulic oil in the small cavity (i.e. the rod cavity) of the movable arm oil cylinder enters into the next link through the movable arm multi-way valve, the bucket multi-way valve is operated, and the bucket can act.

As shown in fig. 3, the boom down action is shown, hydraulic oil enters from the main oil inlet, passes through the boom multi-way valve down position, the quick-change connector enters the boom cylinder small cavity, the boom cylinder small cavity hydraulic oil enters the next link through the boom multi-way valve, the bucket multi-way valve is operated, and the bucket can act.

As shown in FIG. 4, the movable arm floats under the action of external force when the large cavity and the small cavity of the movable arm are communicated with no pressure.

As shown in fig. 5, the bucket rapid tipping action is shown, hydraulic oil enters a large cavity (i.e. a rod cavity) of the bucket cylinder from the tipping position of the bucket multi-way valve, and hydraulic oil in a small cavity of the bucket cylinder directly enters the large cavity (i.e. a rodless cavity) of the bucket cylinder through the bucket multi-way valve, so that the bucket cylinder rapid tipping action is realized.

As shown in fig. 6, the bucket slowly-tipping motion is shown, the bucket multi-way valve continues to move, and is switched to the rightmost position, hydraulic oil enters the large cavity of the bucket cylinder from the tipping position of the bucket multi-way valve, and hydraulic oil in the small cavity of the bucket cylinder no longer enters the large cavity of the bucket cylinder through the bucket multi-way valve, but flows out to external equipment through the oil supply pipeline 11, so that the forward tipping motion of the bucket cylinder is slowed.

The bucket retraction motion is shown in fig. 7.

The utility model has the advantages that: the movable arm cylinder and the bucket cylinder act simultaneously and are not mutually influenced, and the two action states of fast forward turning and slow forward turning of the bucket can be realized.

It should be noted that, all the electronic components related to the present utility model adopt the prior art, and the above components are electrically connected to the controller, and the control circuit between the controller and the components is the prior art.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims (10)

1. A front loading hydraulic control system, characterized by: the multi-way valve comprises a movable arm (1), a bucket (2) and a multi-way valve block, wherein the multi-way valve block is provided with a total oil inlet, a total oil return port, a first oil receiving port, a second oil receiving port, a third oil receiving port and a fourth oil receiving port, the total oil inlet can be communicated with the first oil receiving port and/or the third oil receiving port, and the total oil return port can be communicated with the second oil receiving port and/or the fourth oil receiving port;

the first oil receiving port is communicated with the rodless cavity of the movable arm (1) through a first pipeline, and the second oil receiving port is communicated with the rod cavity of the movable arm (1) through a second pipeline; the oil receiving port three is communicated with the rodless cavity of the bucket (2) through a pipeline III, and the oil receiving port four is communicated with the rod cavity of the bucket (2) through a pipeline IV.

2. The front loading hydraulic control system of claim 1, wherein: the multi-way valve block comprises a movable arm multi-way valve (3) and a bucket multi-way valve (4), the first oil receiving port and the second oil receiving port are respectively positioned on the movable arm multi-way valve (3), and the movable arm multi-way valve (3) is also provided with a movable arm oil inlet and a movable arm oil return port; the movable arm oil inlet can be communicated with the oil receiving port I and the movable arm oil return port II, or the movable arm oil inlet can be communicated with the oil receiving port II and the movable arm oil return port I;

the third oil receiving port and the fourth oil receiving port are respectively positioned on the bucket multi-way valve (4), and the bucket multi-way valve (4) is also provided with a bucket oil inlet and a bucket oil return port; the bucket oil inlet can be communicated with the oil receiving third and the bucket oil return port can be communicated with the oil receiving fourth, or the bucket oil inlet can be communicated with the oil receiving fourth and the bucket oil return port can be communicated with the oil receiving fourth;

the movable arm oil inlet and the bucket oil inlet form the total oil inlet, and the movable arm oil return port and the bucket oil return port form the total oil return port.

3. The front-loading hydraulic control system of claim 2, wherein: and quick-change connectors (5) are respectively arranged on the first pipeline and/or the second pipeline and/or the third pipeline and/or the fourth pipeline.

4. The front-loading hydraulic control system of claim 2, wherein: the movable arm multi-way valve (3) and/or the bucket multi-way valve (4) are three-position four-way valves.

5. The front-loading hydraulic control system of claim 2, wherein: the movable arm oil inlet and the bucket oil inlet are respectively communicated with an oil return pipeline (6) through pipelines.

6. The front loading hydraulic control system of claim 5, wherein: the movable arm oil return port and the bucket oil return port are respectively communicated with an oil inlet pipeline (7) through pipelines.

7. The front loading hydraulic control system of claim 6, wherein: the oil inlet pipeline (7) is communicated with the oil return pipeline (6) through a safety pipeline (8), and a safety valve (9) is fixedly arranged on the safety pipeline (8).

8. The front loading hydraulic control system of claim 6, wherein: the oil return device is characterized by further comprising an oil tank, wherein one end of the oil inlet pipeline (7) and one end of the oil return pipeline (6) are respectively communicated with the oil tank, and an oil pump is fixedly installed on the oil inlet pipeline (7).

9. The front loading hydraulic control system of claim 6, wherein: and the oil inlet pipeline (7) is fixedly provided with a one-way valve (10) corresponding to the movable arm oil inlet and/or the bucket oil inlet respectively.

10. A tractor, characterized in that: a front loading hydraulic control system comprising any one of claims 1-9.

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