阅读说明：本技术 作业车辆的臂架液压系统、控制方法及作业车辆 (Boom hydraulic system of working vehicle, control method and working vehicle ) 是由 魏亚军 饶水冰 杨彦琳 苗慧燕 于 2021-01-15 设计创作，主要内容包括：本发明提供一种作业车辆的臂架液压系统、控制方法及作业车辆,包括：臂架、伸缩油缸、变幅油缸、第一应急阀、第二应急阀和机动换向阀；所述第一应急阀与所述伸缩油缸的无杆腔连接；所述第二应急阀与所述变幅油缸的无杆腔连接；所述机动换向阀分别与所述伸缩油缸、所述第一应急阀与所述第二应急阀连接,所述伸缩油缸控制所述机动换向阀换向。本发明提供的一种作业车辆的臂架液压系统、控制方法及作业车辆,通过对臂架应急下放液压系统控制顺序的调节,使得臂架仅靠重力缩回,在臂架未缩回到位时,臂架不能变幅,保证安全。(The invention provides a boom hydraulic system of an operation vehicle, a control method and the operation vehicle, comprising: the hydraulic control system comprises a boom, a telescopic oil cylinder, a variable amplitude oil cylinder, a first emergency valve, a second emergency valve and a motorized reversing valve; the first emergency valve is connected with a rodless cavity of the telescopic oil cylinder; the second emergency valve is connected with the rodless cavity of the luffing cylinder; the motor-driven reversing valve is respectively connected with the telescopic oil cylinder, the first emergency valve and the second emergency valve, and the telescopic oil cylinder controls the motor-driven reversing valve to reverse. According to the boom hydraulic system, the control method and the working vehicle of the working vehicle, the boom is retracted only by gravity through adjustment of the control sequence of the boom emergency lowering hydraulic system, and the boom cannot change amplitude when the boom is not retracted in place, so that safety is guaranteed.)

1. A boom hydraulic system of a work vehicle, comprising: the hydraulic control system comprises a boom, a telescopic oil cylinder, a variable amplitude oil cylinder, a first emergency valve, a second emergency valve and a motorized reversing valve;

the first emergency valve is connected with a rodless cavity of the telescopic oil cylinder;

the second emergency valve is connected with the rodless cavity of the luffing cylinder;

the motor-driven reversing valve is respectively connected with the telescopic oil cylinder, the first emergency valve and the second emergency valve, and the telescopic oil cylinder controls the motor-driven reversing valve to reverse.

2. The boom hydraulic system of a work vehicle of claim 1, further comprising: and the travel switch is respectively connected with the second emergency valve and the telescopic oil cylinder and used for detecting a telescopic signal of the telescopic oil cylinder and controlling the reversing of the second emergency valve.

3. The boom hydraulic system of a work vehicle of claim 1, further comprising: a first control switch and a second control switch;

the first control switch is connected with the first emergency valve and used for controlling the first emergency valve to change direction;

and the second control switch is connected with the second emergency valve and used for controlling the second emergency valve to change direction.

4. The boom hydraulic system of a work vehicle of claim 1, further comprising: and the third control switch is respectively connected with the first emergency valve and the second emergency valve and is used for respectively controlling the reversing of the first emergency valve and the second emergency valve.

5. The boom hydraulic system of a work vehicle of any of claims 1-4, wherein the first contingency valve and the second contingency valve are electric and/or manual valve bodies.

6. A control method of a boom hydraulic system of a work vehicle according to any of the preceding claims 1 to 4, characterized by comprising:

responding to an emergency lowering instruction, and acquiring position information of the telescopic oil cylinder and the luffing oil cylinder;

and finishing the emergency lowering action of the arm support according to the position information of the telescopic oil cylinder and the luffing oil cylinder.

7. The method for controlling the boom hydraulic system of the working vehicle as claimed in claim 6, wherein the step of completing the emergency lowering action of the boom according to the position information of the telescopic cylinder and the luffing cylinder specifically comprises:

if the telescopic oil cylinder and the luffing oil cylinder are both in working positions, the motorized reversing valve controls the emergency oil path of the telescopic oil cylinder to be conducted, the emergency oil path of the luffing oil cylinder is cut off, and the telescopic oil cylinder retracts;

after the telescopic oil cylinder retracts to the initial position, the motorized reversing valve reverses to control the emergency oil path of the luffing oil cylinder to be communicated, and the luffing oil cylinder retracts;

and finishing the emergency lowering action.

8. The method for controlling the boom hydraulic system of the working vehicle as claimed in claim 6, wherein the step of completing the emergency lowering action of the boom according to the position information of the telescopic cylinder and the luffing cylinder specifically comprises:

if the telescopic oil cylinder is in the working position and the amplitude-variable oil cylinder is in the initial position, the motorized reversing valve controls the conduction of the emergency oil path of the telescopic oil cylinder, the emergency oil path of the amplitude-variable oil cylinder is closed, the telescopic oil cylinder retracts, and the emergency lowering action is finished;

or if the amplitude-variable oil cylinder is in the working position and the telescopic oil cylinder is in the initial position, the motorized reversing valve controls the emergency oil path conduction of the amplitude-variable oil cylinder, the amplitude-variable oil cylinder retracts, and the emergency lowering action is finished.

9. A work vehicle, characterized by comprising: boom and boom hydraulic system of a work vehicle according to any of the preceding claims 1-4; the arm support is a telescopic arm support, and the telescopic oil cylinder and the variable amplitude oil cylinder are respectively connected with the arm support.

10. A work vehicle according to claim 9, characterised by a method of controlling a work vehicle boom hydraulic system according to any of claims 6 to 8.

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a boom hydraulic system of a working vehicle, a control method and the working vehicle.

Background

At present, for the climbing operation vehicle with the boom having the telescopic and amplitude-variable functions, the boom can be placed in an emergency manner when a hydraulic system of the climbing operation vehicle fails or other faults affecting normal operation occur, so that personnel can be prevented from being detained at high altitude for a long time. The technical scheme that most of the prior art adopts is that one path of pressure oil is led to serve as a control oil path, so that the boom is controlled to retract or be lowered, similar emergency measures are adopted, and the risk of failure exists, for example, a telescopic oil cylinder balance valve is opened by utilizing the pressure of a rodless cavity of a luffing oil cylinder, so that the telescopic oil cylinder retracts, and when the telescopic oil cylinder retracts, the luffing oil cylinder also retracts, so that the whole vehicle is in a tipping risk, or when the boom is lowered in an emergency, the possibility that the boom cannot retract due to misoperation exists, so that an accident is caused.

Disclosure of Invention

The invention provides a boom hydraulic system of an operating vehicle, which is used for solving the defect that similar emergency measures are adopted to cause failure risks by leading one path of pressure oil as a control oil path so as to control the boom to retract or lower in the prior art.

The invention further provides a control method of the hydraulic system of the boom of the working vehicle, which is used for solving the defects that similar emergency measures are adopted and failure risks exist in the prior art that the boom is controlled to retract or lower by introducing one path of pressure oil as a control oil path, and the boom can retract only by means of gravity by improving the control method in the emergency lowering process of the boom, so that the boom cannot change amplitude when the boom is not retracted in place, and the safety is ensured.

The invention further provides an operation vehicle, which is used for solving the defect that similar emergency measures exist and failure risks exist when one path of pressure oil is introduced as a control oil path so as to control the boom to retract or lower in the prior art, and the boom can retract only by gravity by adjusting the control sequence of the boom emergency lowering hydraulic system, so that the boom cannot change amplitude when the boom is not retracted in place, and the safety is ensured.

According to a first aspect of the present invention, there is provided a boom hydraulic system for a work vehicle, comprising: the hydraulic control system comprises a boom, a telescopic oil cylinder, a variable amplitude oil cylinder, a first emergency valve, a second emergency valve and a motorized reversing valve;

the first emergency valve is connected with a rodless cavity of the telescopic oil cylinder;

the second emergency valve is connected with the rodless cavity of the luffing cylinder;

the motor-driven reversing valve is respectively connected with the telescopic oil cylinder, the first emergency valve and the second emergency valve, and the telescopic oil cylinder controls the motor-driven reversing valve to reverse.

According to an embodiment of the present invention, further comprising: and the travel switch is respectively connected with the second emergency valve and the telescopic oil cylinder and used for detecting a telescopic signal of the telescopic oil cylinder and controlling the reversing of the second emergency valve.

Specifically, the embodiment provides an implementation manner of a travel switch, and through the setting of the travel switch, after the boom retracts in place, the travel switch detects a telescopic signal of the telescopic cylinder and controls the second emergency valve to reverse, and the boom automatically starts to be lowered to realize amplitude variation, so that the setting operation is convenient and fast, and misoperation is avoided.

According to an embodiment of the present invention, further comprising: a first control switch and a second control switch;

the first control switch is connected with the first emergency valve and used for controlling the first emergency valve to change direction;

and the second control switch is connected with the second emergency valve and used for controlling the second emergency valve to change direction.

Specifically, the present embodiment provides another implementation manner for controlling the first emergency valve and the second emergency valve, and the first control switch and the second control switch are arranged to directly act on the first emergency valve and the second emergency valve, so that the control over the telescopic cylinder and the luffing cylinder is realized by directly operating the first emergency valve and the second emergency valve.

In an application scene, the first control switch is a switch for controlling the start and stop of the telescopic oil cylinder, the second control switch is a switch for controlling the start and stop of the amplitude variation oil cylinder, and when the telescopic oil cylinder is not retracted in place, the second control switch cannot control the amplitude variation oil cylinder.

According to an embodiment of the present invention, further comprising: and the third control switch is respectively connected with the first emergency valve and the second emergency valve and is used for respectively controlling the reversing of the first emergency valve and the second emergency valve.

In particular, the present embodiment provides a further embodiment of the control of the first and second emergency valves, by providing a third control switch, the control of the first and second emergency valves by one switch is achieved.

In an application scenario, when the telescopic oil cylinder is not retracted in place, the third control switch is only a switch for controlling the start and stop of the telescopic oil cylinder, and when the telescopic oil cylinder is retracted in place, the third control switch is a switch for controlling the start and stop of the amplitude variation oil cylinder.

According to one embodiment of the invention, the first emergency valve and the second emergency valve are electric and/or manual valve bodies.

Specifically, the embodiment provides an implementation manner of controlling the first emergency valve and the second emergency valve, and the first emergency valve and the second emergency valve are provided as valve bodies including multiple control manners, so that the first emergency valve and the second emergency valve can be applied to more application scenarios, for example, when an electrical system fails, emergency lowering of the boom can also be completed through manual control.

According to a second aspect of the present invention, a control method for a boom hydraulic system of a work vehicle based on the above is provided, including:

responding to an emergency lowering instruction, and acquiring position information of the telescopic oil cylinder and the luffing oil cylinder;

and finishing the emergency lowering action of the arm support according to the position information of the telescopic oil cylinder and the luffing oil cylinder.

According to an embodiment of the present invention, the step of completing the emergency lowering operation of the boom according to the position information of the telescopic cylinder and the luffing cylinder specifically includes:

if the telescopic oil cylinder and the luffing oil cylinder are both in working positions, the motorized reversing valve controls the emergency oil path of the telescopic oil cylinder to be conducted, the emergency oil path of the luffing oil cylinder is cut off, and the telescopic oil cylinder retracts;

after the telescopic oil cylinder retracts to the initial position, the motorized reversing valve reverses to control the emergency oil path of the luffing oil cylinder to be communicated, and the luffing oil cylinder retracts;

and finishing the emergency lowering action.

Specifically, the embodiment provides an implementation mode of an emergency boom lowering action, the emergency boom lowering action under the position information is implemented by setting the position information of the telescopic oil cylinder and the luffing oil cylinder, and the safe boom lowering is implemented according to the setting of the first action of the telescopic oil cylinder and the second action of the luffing oil cylinder.

According to an embodiment of the present invention, the step of completing the emergency lowering operation of the boom according to the position information of the telescopic cylinder and the luffing cylinder specifically includes:

if the telescopic oil cylinder is in the working position and the amplitude-variable oil cylinder is in the initial position, the motorized reversing valve controls the conduction of the emergency oil path of the telescopic oil cylinder, the emergency oil path of the amplitude-variable oil cylinder is closed, the telescopic oil cylinder retracts, and the emergency lowering action is finished;

or if the amplitude-variable oil cylinder is in the working position and the telescopic oil cylinder is in the initial position, the motorized reversing valve controls the emergency oil path conduction of the amplitude-variable oil cylinder, the amplitude-variable oil cylinder retracts, and the emergency lowering action is finished.

Specifically, the embodiment provides another implementation manner of the boom emergency lowering action, the implementation of the emergency lowering action under the position information is realized by setting the position information of the telescopic oil cylinder and the luffing oil cylinder, and the safe lower part of the boom is realized according to the setting of the first action of the telescopic oil cylinder and the second action of the luffing oil cylinder.

According to a third aspect of the present invention, there is provided a work vehicle comprising: the boom hydraulic system comprises a boom and the boom hydraulic system of the working vehicle; the arm support is a telescopic arm support, and the telescopic oil cylinder and the variable amplitude oil cylinder are respectively connected with the arm support.

According to an embodiment of the invention, the control method for the hydraulic system of the boom of the work vehicle is provided.

One or more technical solutions in the present invention have at least one of the following technical effects: according to the boom hydraulic system, the control method and the working vehicle of the working vehicle, the boom is retracted only by gravity through adjustment of the control sequence of the boom emergency lowering hydraulic system, and the boom cannot change amplitude when the boom is not retracted in place, so that safety is guaranteed.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is one of schematic layout diagrams of a boom hydraulic system of a work vehicle according to the present disclosure;

FIG. 2 is one of the control circuit schematics of the boom hydraulic system of the work vehicle provided by the present disclosure;

FIG. 3 is a second schematic diagram illustrating a boom hydraulic system of the work vehicle according to the present invention;

FIG. 4 is a second schematic diagram of a control circuit for a boom hydraulic system of a work vehicle according to the present disclosure;

FIG. 5 is a third schematic view of a boom hydraulic system of a work vehicle according to the present disclosure;

fig. 6 is a flowchart illustrating a method for controlling a boom hydraulic system of a work vehicle according to the present invention.

Reference numerals:

10. a telescopic oil cylinder; 20. A variable amplitude oil cylinder; 30. A first emergency valve;

40. a second emergency valve; 50. A motorized reversing valve; 60. A travel switch;

70. a first control switch; 80. A second control switch; 90. A third control switch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In some embodiments of the present invention, as shown in fig. 1 to 5, the present disclosure provides a boom hydraulic system of a work vehicle, including: the hydraulic control system comprises a boom, a telescopic oil cylinder 10, a luffing oil cylinder 20, a first emergency valve 30, a second emergency valve 40 and a motorized reversing valve 50; the first emergency valve 30 is connected with the rodless cavity of the telescopic oil cylinder 10; the second emergency valve 40 is connected with the rodless cavity of the luffing cylinder 20; the motor-driven reversing valve 50 is respectively connected with the telescopic oil cylinder 10, the first emergency valve 30 and the second emergency valve 40, and the telescopic oil cylinder 10 controls the motor-driven reversing valve 50 to reverse.

In detail, the invention provides a boom hydraulic system of an operating vehicle, which is used for solving the defect that similar emergency measures exist in the prior art that the boom is controlled to retract or lower by introducing a path of pressure oil as a control oil path, the boom retracts only by gravity by adjusting the control sequence of the hydraulic system of the boom, and the boom cannot change amplitude when the boom is not retracted in place, so that the safety is ensured.

In some possible embodiments of the present invention, the method further includes: the travel switch 60 and the travel switch 60 are respectively connected with the second emergency valve 40 and the telescopic cylinder 10 and are used for detecting a telescopic signal of the telescopic cylinder 10 and controlling the second emergency valve 40 to change direction.

Specifically, in the embodiment, by setting the travel switch 60, after the boom retracts to the right position, the travel switch 60 detects a telescopic signal of the telescopic cylinder 10 and controls the second emergency valve 40 to change the direction, and the boom automatically starts to be lowered to realize amplitude variation.

In some possible embodiments of the present invention, the method further includes: a first control switch 70 and a second control switch 80; the first control switch 70 is connected with the first emergency valve 30 and is used for controlling the first emergency valve 30 to change direction; a second control switch 80 is connected to the second contingency valve 40 for controlling the reversal of the second contingency valve 40.

Specifically, the embodiment provides another control mode of the first emergency valve 30 and the second emergency valve 40, the first emergency valve 30 and the second emergency valve 40 can be directly acted on by arranging the first control switch 70 and the second control switch 80, and the control of the telescopic cylinder 10 and the luffing cylinder 20 is realized by directly operating the first emergency valve 30 and the second emergency valve 40.

In an application scenario, the first control switch 70 is a switch for controlling the telescopic cylinder 10 to start and stop, and the second control switch 80 is a switch for controlling the luffing cylinder 20 to start and stop, and in use, if the telescopic cylinder 10 is not retracted in place, the second control switch 80 cannot control the luffing cylinder 20.

In some possible embodiments of the present invention, the method further includes: a third control switch 90, the third control switch 90 being connected to the first contingency valve 30 and the second contingency valve 40, respectively, for controlling the reversal of the first contingency valve 30 and the second contingency valve 40, respectively.

In particular, the present embodiment provides a further embodiment of the control of the first 30 and second 40 contingency valves, by providing a third control switch 90, the control of the first 30 and second 40 contingency valves by one switch is achieved.

In an application scenario, when the telescopic cylinder 10 is not retracted in place, the third control switch 90 is only a switch for controlling the telescopic cylinder 10 to start or stop, and when the telescopic cylinder 10 is retracted in place, the third control switch 90 is a switch for controlling the luffing cylinder 20 to start or stop.

In some possible embodiments of the invention, the first contingency valve 30 and the second contingency valve 40 are electric and/or manual valve bodies.

Specifically, the embodiment provides an implementation manner of controlling the first emergency valve 30 and the second emergency valve 40, and the first emergency valve 30 and the second emergency valve 40 are provided as valve bodies including multiple control manners, so that the first emergency valve 30 and the second emergency valve 40 can be applied to more application scenarios, for example, when an electrical system fails, emergency lowering of the boom can be completed through manual control.

In some embodiments of the present invention, as shown in fig. 1 to 6, the present disclosure provides a control method based on the above-mentioned work vehicle boom hydraulic system, including:

responding to an emergency lowering instruction, and acquiring position information of the telescopic oil cylinder 10 and the luffing oil cylinder 20;

and finishing the emergency lowering action of the arm support according to the position information of the telescopic oil cylinder 10 and the luffing oil cylinder 20.

In some possible embodiments of the present invention, the step of completing the emergency lowering operation of the boom according to the position information of the telescopic cylinder 10 and the luffing cylinder 20 specifically includes:

if the telescopic oil cylinder 10 and the luffing oil cylinder 20 are both in working positions, the motor-driven reversing valve 50 controls the emergency oil path of the telescopic oil cylinder 10 to be conducted, the emergency oil path of the luffing oil cylinder 20 is cut off, and the telescopic oil cylinder 10 retracts;

after the telescopic oil cylinder 10 retracts to the initial position, the motorized reversing valve 50 reverses to control the emergency oil circuit of the luffing oil cylinder 20 to be communicated, and the luffing oil cylinder 20 retracts;

and finishing the emergency lowering action.

Specifically, the embodiment provides an implementation mode of an emergency boom lowering action, the emergency boom lowering action under the position information is implemented by setting the position information of the telescopic oil cylinder 10 and the luffing oil cylinder 20, and the safe boom lowering is implemented according to the setting that the telescopic oil cylinder 10 acts first and the luffing oil cylinder 20 acts later.

In some possible embodiments of the present invention, the step of completing the emergency lowering operation of the boom according to the position information of the telescopic cylinder 10 and the luffing cylinder 20 specifically includes:

if the telescopic oil cylinder 10 is in the working position and the luffing oil cylinder 20 is in the initial position, the motor-driven reversing valve 50 controls the emergency oil path of the telescopic oil cylinder 10 to be conducted, the emergency oil path of the luffing oil cylinder 20 is closed, the telescopic oil cylinder 10 retracts, and the emergency lowering action is finished;

or, if the luffing cylinder 20 is in the working position and the telescopic cylinder 10 is in the initial position, the motorized reversing valve 50 controls the emergency oil path of the luffing cylinder 20 to be conducted, the luffing cylinder 20 retracts, and the emergency lowering operation is finished.

Specifically, the embodiment provides another implementation manner of the boom emergency lowering action, the implementation of the emergency lowering action under the position information is realized by setting the position information of the telescopic cylinder 10 and the luffing cylinder 20, and the safe lower part of the boom is realized according to the setting of the first action of the telescopic cylinder 10 and the subsequent action of the luffing cylinder 20.

In some embodiments of the present invention, the present disclosure provides a work vehicle comprising: the boom hydraulic system comprises a boom and the boom hydraulic system of the working vehicle; the arm support is a telescopic arm support, and the telescopic oil cylinder 10 and the variable amplitude oil cylinder 20 are respectively connected with the arm support.

In some possible embodiments of the present invention, there is a method for controlling a boom hydraulic system of a work vehicle as described above.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.