CN115263854A - Hydraulic step control device and working machine - Google Patents

Hydraulic step control device and working machine Download PDF

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Publication number
CN115263854A
CN115263854A CN202210874535.6A CN202210874535A CN115263854A CN 115263854 A CN115263854 A CN 115263854A CN 202210874535 A CN202210874535 A CN 202210874535A CN 115263854 A CN115263854 A CN 115263854A
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CN
China
Prior art keywords
hydraulic
cavity
reversing valve
oil passage
oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210874535.6A
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Chinese (zh)
Inventor
张凯
张学敏
李俊飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Sany Intelligent Technology Co Ltd
Original Assignee
Beijing Sany Intelligent Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Sany Intelligent Technology Co Ltd filed Critical Beijing Sany Intelligent Technology Co Ltd
Priority to CN202210874535.6A priority Critical patent/CN115263854A/en
Publication of CN115263854A publication Critical patent/CN115263854A/en
Priority to PCT/CN2023/104429 priority patent/WO2024017012A1/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator

Abstract

The invention relates to the technical field of hydraulic control, in particular to a hydraulic stepping control device and an operating machine. The invention provides a hydraulic step control device, comprising: the cylinder piston mechanism comprises a cylinder and a piston arranged in the cylinder, and the piston divides an inner cavity of the cylinder into a first cavity and a second cavity; the first oil way is connected with the first cavity; the second oil way is connected with the second cavity; the third oil path is used for inputting hydraulic medium; the fourth oil path is used for outputting hydraulic medium; and the reversing valve assembly is connected with the first oil path, the second oil path, the third oil path and the fourth oil path and can be switched between a first state and a second state. The invention provides a hydraulic stepping control device and an operating machine, which can realize accurate control on a hydraulic actuating mechanism and are suitable for working condition environments of certain specific working condition environments.

Description

Hydraulic step control device and working machine
Technical Field
The invention relates to the technical field of hydraulic control, in particular to a hydraulic stepping control device and an operating machine.
Background
In order to accurately control the displacement of the hydraulic actuator, in the prior art, a displacement sensor (or an angular displacement sensor) is usually disposed on the hydraulic actuator, and the displacement sensor can sense the position of an actuating component of the hydraulic actuator and feed a position signal back to a hydraulic control module, and the hydraulic control module controls the displacement of the hydraulic actuator according to the position signal.
In the prior art, a displacement sensor is arranged on a hydraulic actuator so as to sense the position of an actuating part of the hydraulic actuator. However, in some special working conditions, for example, when the hydraulic actuator works underwater or in mud, it is difficult to protect the displacement sensor, the joint or the line connected with the displacement sensor, and further, the displacement control of the hydraulic actuator is easy to fail.
Disclosure of Invention
The invention provides a hydraulic stepping control device and an operating machine, which can realize accurate control on a hydraulic actuating mechanism and are suitable for special working condition environments. A first aspect of the present invention provides a hydraulic step control device for step-controlling a hydraulic actuator of a working machine, including:
the cylinder barrel piston mechanism comprises a cylinder barrel and a piston arranged in the cylinder barrel, and the piston divides an inner cavity of the cylinder barrel into a first cavity and a second cavity;
the first oil way is connected with the end part of the first cavity;
the second oil path is connected with the end part of the second cavity;
the third oil way is used for being connected with an oil source so as to input hydraulic medium into the inner cavity of the cylinder barrel;
the fourth oil way is used for being connected with the hydraulic actuating mechanism so as to output hydraulic media to the hydraulic actuating mechanism;
the reversing valve assembly is connected with the first oil path, the second oil path, the third oil path and the fourth oil path and can be switched between a first state and a second state, and in the first state, the third oil path is communicated with the first oil path, and the second oil path is communicated with the fourth oil path; in the second state, the third oil passage is communicated with the second oil passage, and the first oil passage is communicated with the fourth oil passage; controlling the step action of the hydraulic actuator by repeatedly switching the reversing valve assembly between the first state and the second state.
According to the hydraulic step control device provided by the invention, the reversing valve assembly further comprises a third state in which the third oil passage is communicated with the fourth oil passage.
According to the hydraulic step control device provided by the invention, the device further comprises:
a sensing unit for generating a sensing signal when the piston is displaced to the end of the first cavity or to the end of the second cavity.
According to the hydraulic step control apparatus provided by the present invention, the sensing unit includes:
the first induction module generates an induction signal when the piston is displaced to the terminal position of the first cavity;
and the second sensing module generates a sensing signal when the piston is displaced to the terminal position of the second cavity.
According to the hydraulic step control device provided by the invention, the hydraulic step control device further comprises:
the counting module is electrically connected with the sensing unit and used for respectively calculating the times of the piston moving to the first cavity terminal and the second cavity terminal;
and the control module is connected with the counting module and the reversing valve assembly and is used for controlling the reversing valve assembly according to the initial position and the target position of the hydraulic actuating mechanism so as to control the reciprocating times of the piston to be displaced to the first cavity terminal and the second cavity terminal.
According to the hydraulic step control device provided by the invention, the reversing valve assembly comprises a first reversing valve, the third oil path is connected with a first connector of the first reversing valve, and the first oil path and the second oil path are respectively connected with a second connector and a third connector of the first reversing valve.
According to the hydraulic step control device provided by the invention, the reversing valve assembly comprises a second reversing valve, the fourth oil path is connected with a first connector of the second reversing valve, and the first oil path and the second oil path are respectively connected with a second connector and a third connector of the second reversing valve.
According to the hydraulic step control device provided by the invention, the reversing valve assembly comprises a third reversing valve, the third oil path is connected with a first interface of the third reversing valve through a first branch path, and the fourth oil path is connected with a second interface of the third reversing valve through a second branch path.
According to the hydraulic step control device provided by the invention, the cylinder piston mechanism, the first oil path, the second oil path, the third oil path, the fourth oil path and the reversing valve assembly are integrated together.
A second aspect of the present invention provides a work machine comprising:
a hydraulic actuator;
the hydraulic step control device according to any one of the above claims, wherein the fourth oil passage is connected to the hydraulic actuator.
According to the technical scheme provided by the invention, the hydraulic stepping control device can realize accurate control on the hydraulic actuating mechanism, the third oil way is used for being connected with a hydraulic medium source, and the fourth oil way is used for being connected with the hydraulic actuating mechanism. When the reversing valve component is in a first state, the third oil way is communicated with the first oil way, the second oil way is communicated with the fourth oil way, at the moment, the first cavity is filled with oil, the hydraulic medium pushes the piston to displace towards the terminal direction of the second cavity, the hydraulic medium in the second cavity is extruded to drive the hydraulic actuating mechanism to act, when the piston displaces to the terminal end of the second cavity, the reversing valve component is controlled to be switched to a second state, at the second state, the third oil way is communicated with the second oil way, the first oil way is communicated with the fourth oil way, at the moment, the second cavity is filled with oil, the hydraulic medium pushes the piston to displace towards the terminal direction of the first cavity, the hydraulic medium in the first cavity is extruded to drive the hydraulic actuating mechanism to act, and when the piston displaces to the terminal end of the first cavity, the reversing valve component is controlled to be switched to the first state, and the process is circulated.
Since the volume of the cylinder is quantitative, the piston is displaced from the end of the first cavity to the end of the second cavity or from the end of the second cavity to the end of the first cavity each time, the amount of hydraulic medium discharged from the cylinder is quantitative, i.e. the displacement of the driving hydraulic actuator is quantitative. As can be seen from the above analysis, in the present embodiment, the amount of the hydraulic medium discharged from the piston from one end of the cylinder to the other end of the cylinder is a fixed amount, which corresponds to a step amount for controlling the hydraulic actuator to perform a unit displacement amount, and further, the hydraulic medium is delivered in an equal volume at each time to serve as a step amount output, so that the accurate control of the hydraulic actuator in which the displacement amount generated by the step amount output is used as a measurement unit is realized. Therefore, by controlling the reciprocating displacement times of the piston, the accurate control of the hydraulic actuating mechanism can be realized.
Moreover, the hydraulic stepping control device provided by the invention does not need to be arranged on an action part of the hydraulic actuating mechanism, the part is not easy to damage, meanwhile, the sealing protection of the hydraulic stepping control device is easy to realize, and the problem that the displacement control of the hydraulic actuating mechanism is easy to lose efficacy under special working conditions is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a hydraulic step control arrangement in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of an external structure of a hydraulic step control device according to an embodiment of the present invention;
FIG. 3 is a rear (cross-sectional) view of a hydraulic step control in an embodiment of the present invention;
FIG. 4 is a schematic view of the hydraulic step control device in the embodiment of the present invention in an initial state during operation and when the piston moves to the end of the first cavity;
FIG. 5 is a schematic representation of the flow of hydraulic medium in a first state of the reversing valve assembly during operation of the hydraulic stepper control apparatus in accordance with the disclosed embodiment;
FIG. 6 is a schematic view of the hydraulic step control apparatus of an embodiment of the present invention with the reversing valve assembly in the first state and the piston moving to the end of the second cavity;
FIG. 7 is a schematic flow diagram of hydraulic medium in a second state of the reversing valve assembly during operation of the hydraulic step control apparatus in accordance with an embodiment of the present invention;
fig. 8 is a schematic flow diagram of hydraulic medium when the reversing valve assembly is in the third state during operation of the hydraulic step control device in accordance with an embodiment of the present invention.
Reference numerals:
11: a cylinder barrel; 12: a first direction changing valve; 13: a second directional control valve; 14: a third directional control valve; 15: a first sensing module; 16: a second sensing module; 17: a piston; 18: a first oil passage; 19: a second oil passage; 20: a third oil passage; 21: a fourth oil passage; 22: a first branch; 23: a second branch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, 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 inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that, the displacement sensor includes a sensing end and a sensed end, and the sensing end and the sensed end can establish signal connection so as to sense the position of the sensed end through the sensing end. Among the prior art, be provided with displacement sensor's the end of being responded to on hydraulic actuator's the action part, for example, be provided with displacement sensor's the end of being responded to on the piston rod of pneumatic cylinder or hydraulic motor's the rotor, displacement sensor's response end can sense the position by the end of being responded to displacement sensor can feed back the sensing signal to hydraulic control module, and the position control hydraulic actuator's through the action part of response opens and stops, and then accomplishes the displacement control to hydraulic actuator.
However, in some special working conditions, it is difficult to protect the displacement sensor, the joint or the circuit connected with the displacement sensor, and further the displacement control of the hydraulic actuator is easy to fail.
Based on the above technical problem, referring to fig. 1 to 8, an embodiment of the present invention provides a hydraulic step control device, which includes a cylinder piston mechanism, a first oil path 18, a second oil path 19, a third oil path 20, a fourth oil path 21, and a reversing valve assembly.
Wherein, cylinder piston mechanism includes cylinder 11 and sets up the piston 17 in cylinder 11. In this embodiment, the two ends of the cylinder 11 are both provided with oil ports connected to an external oil path, and the piston 17 is disposed in the cylinder 11 and can push the piston 17 to reciprocate in the cylinder 11 under the action of a hydraulic medium. The specific structures of the cylinder 11 and the piston 17 can refer to the cylinder and the piston of a hydraulic cylinder in the prior art, and are not described herein again.
In this embodiment, the piston 17 divides the inner cavity of the cylinder 11 into a first cavity and a second cavity, the first oil path 18 is connected to the first cavity, the second oil path 19 is connected to the second cavity, and the third oil path 20 is used for inputting a hydraulic medium, for example, the hydraulic medium output by a hydraulic pump enters the hydraulic step control device provided in this embodiment through the third oil path 20. The fourth oil passage 21 is used for outputting hydraulic medium, and the hydraulic medium output by the fourth oil passage 21 can enter the hydraulic actuator to drive the hydraulic actuator to act.
The direction valve assembly is connected to the first oil passage 18, the second oil passage 19, the third oil passage 20, and the fourth oil passage 21, and is switchable between a first state and a second state.
When the reversing valve assembly is switched to the first state, as shown in fig. 5, the third oil path 20 is communicated with the first oil path 18, and the second oil path 19 is communicated with the fourth oil path 21, that is, the hydraulic medium enters the first cavity of the cylinder 11 through the third oil path 20 and the first oil path 18 under the action of the hydraulic pump, the hydraulic medium pushes the piston 17 in the cylinder 11 to move towards the second cavity, and presses out the hydraulic medium in the second cavity, and the pressed hydraulic medium enters the hydraulic actuator through the second oil path 19 and the fourth oil path 21, so as to drive the hydraulic actuator to act. Until the piston 17 in the cylinder 11 is displaced to the end of the second cavity, as shown in fig. 6.
When the reversing valve assembly is switched to the second state, as shown in fig. 7, the third oil path 20 is communicated with the second oil path 19, and the first oil path 18 is communicated with the fourth oil path 21, that is, the hydraulic medium enters the second cavity of the cylinder 11 through the third oil path 20 and the second oil path 19 under the action of the hydraulic pump, the hydraulic medium pushes the piston 17 in the cylinder 11 to move towards the first cavity, and presses out the hydraulic medium in the first cavity, and the pressed hydraulic medium enters the hydraulic actuator through the first oil path 18 and the fourth oil path 21, so as to drive the hydraulic actuator to act.
It should be noted that, of the two ends of the inner cavity of the cylinder 11, one end located in the first cavity is a terminal of the first cavity, and the other end located in the second cavity is a terminal of the second cavity. When the reversing valve assembly is in the first state, the hydraulic medium pushes the piston 17 to displace towards the terminal direction of the second cavity, the hydraulic medium in the second cavity is pushed out to drive the hydraulic actuating mechanism to act, when the piston 17 displaces to the terminal of the second cavity, the reversing valve assembly is controlled to switch to the second state, and in the second state, the hydraulic medium pushes the piston 17 to displace towards the terminal direction of the first cavity, the hydraulic medium in the first cavity is pushed out to drive the hydraulic actuating mechanism to act, when the piston 17 displaces to the terminal of the first cavity, the reversing valve assembly is controlled to switch to the first state, and the process is circulated in this way, and the specific process can refer to fig. 4 to fig. 7.
Since the volume of the cylinder 11 is a fixed amount, the amount of hydraulic medium discharged from the cylinder 11, i.e., the amount of displacement of the hydraulic actuator, is a fixed amount each time the piston 17 is displaced from the terminal end of the first cavity to the terminal end of the second cavity or from the terminal end of the second cavity to the terminal end of the first cavity.
It should be emphasized that, through the above analysis, in the present embodiment, the amount of the hydraulic medium discharged from the end of the cylinder tube is a fixed amount, which corresponds to a step amount for controlling the hydraulic actuator to perform a unit displacement amount, and further, the accurate control of the hydraulic actuator is realized by using the displacement amount generated by a step amount output as a metering unit through the delivery of the hydraulic medium of an equal volume as a step amount output each time. Therefore, by controlling the number of reciprocating displacements of the piston 17, precise control of the hydraulic actuator can be achieved.
Moreover, the hydraulic stepping control device provided by the embodiment does not need to be installed on an action part of the hydraulic actuating mechanism, and parts are not easy to damage, meanwhile, the hydraulic stepping control device is easy to realize sealing protection, and the problem that the displacement control of the hydraulic actuating mechanism is easy to lose efficacy under special working conditions is avoided.
In a further embodiment, the reversing valve assembly also includes a third condition, as shown in fig. 8, in which the third oil passage 20 is in communication with the fourth oil passage 21. That is, the hydraulic medium output from the hydraulic pump directly enters the hydraulic actuator through the third oil passage 20 and the fourth oil passage 21 without passing through the cylinder piston mechanism, and drives the hydraulic actuator to operate, thereby realizing bypass control. By the arrangement, when the reversing valve assembly is switched to the third state, hydraulic medium pumped by the hydraulic pump does not pass through the cylinder piston mechanism, and the hydraulic actuating mechanism can be directly driven to act.
In some embodiments, the sensing unit is configured to generate a sensing signal when the piston 17 is displaced to the end of the first cavity and the end of the second cavity. And the control module for controlling the reversing valve assembly controls the state switching of the reversing valve assembly through the induction signal generated by the induction unit.
In a further embodiment, the sensing unit includes a first sensing module 15 and a second sensing module 16, wherein the first sensing module 15 and the second sensing module 16 may be specifically sensing switches, and mounting holes for mounting the first sensing module 15 and the second sensing module 16 may be provided on the cylinder wall of the cylinder 11. When the piston 17 is displaced to the terminal position of the first cavity, the piston 17 can trigger the first sensing module 15, so that the first sensing module 15 generates a sensing signal. When the piston 17 is displaced to the end position of the second cavity, the second sensing module 16 generates a sensing signal.
So configured, when the piston 17 is displaced from the terminal of the first cavity to the terminal of the second cavity, the second sensing module 16 can be triggered, and the second sensing module 16 generates a sensing signal. When the piston 17 is displaced from the end of the second cavity to the end of the first cavity, the first sensing module 15 can be triggered, and the first sensing module 15 generates a sensing signal. The control module controls the state switching of the reversing valve assembly according to the sensing signals generated by the first sensing module 15 and the second sensing module 16.
In a further embodiment, the device further comprises a counting module and a control module, which are electrically connected to the sensing unit, and are used for counting the number of times that the piston 17 is displaced to the first cavity terminal and the number of times that the piston 17 is displaced to the second cavity terminal. The control module is connected to the counting module and the reversing valve assembly for controlling the reversing valve assembly to control the number of reciprocations of the displacement of the piston 17 to the first cavity end and the second cavity end.
The control module may be based on a target position of the hydraulic actuator, which may be obtained via operator input. The control module obtains the total amount of the hydraulic medium required to be supplied to the hydraulic actuator according to the initial position and the target position of the hydraulic actuator. Then, the target number of times that the hydraulic actuator reaches the target position and the piston 17 needs to be displaced reciprocally is obtained based on the obtained total amount of the hydraulic medium and the volume of the cylinder 11. Then, the control module controls the reversing valve assembly to switch between the first state and the second state so as to control the piston 17 to reciprocate, and then controls the reversing valve assembly to stop switching according to the actual times of the piston 17 moving to the end of the cavity of the cylinder 11, which are acquired by the counting module, until the actual times of the piston 17 reciprocating displacement is equal to the calculated preset times, so that the hydraulic actuating mechanism reaches a target position.
So set up, the hydraulic pressure step control device that this embodiment provided, its control mode is open-loop control, and control accuracy is higher, and controlling means's stability is higher.
In some embodiments, the reversing valve assembly comprises a first reversing valve 12, a second reversing valve 13 and a third reversing valve 14, wherein the third oil path 20 is connected with the first port of the first reversing valve 12, and the first oil path 18 and the second oil path 19 are respectively connected with the second port and the third port of the first reversing valve 12.
The fourth oil passage 21 is connected to the first port of the second direction valve 13, and the first oil passage 18 and the second oil passage 19 are connected to the second port and the third port of the second direction valve 13, respectively.
The third oil path 20 is connected to a first port of the third directional valve 14 via a first branch 22, and the fourth oil path 21 is connected to a second port of the third directional valve 14 via a second branch 23.
Thus arranged, the first, second and third states of the reversing valve assembly described above can be switched by the first, second and third reversing valves 12, 13, 14.
In a further embodiment, the first direction valve 12, the second direction valve 13 and the third direction valve 14 are all provided as electromagnetic direction valves. And the cylinder piston mechanism, the induction unit, the first oil path 18, the second oil path 19, the third oil path 20, the fourth oil path 21 and the reversing valve assembly are integrated together. Specifically, the above components are integrated on a block structure, as shown in fig. 2 and 3, the block structure is internally provided with oil passages, and is provided with a mounting groove for mounting the cylinder-piston mechanism and interfaces for mounting the valves and the sensing unit. So set up, the hydraulic pressure step control device that this embodiment provided has higher integrated level, and stable in structure is reliable.
The embodiment of the invention also provides a working machine which comprises a hydraulic actuating mechanism and the hydraulic stepping control device as described in any one of the embodiments, wherein the fourth oil path 21 is connected with the hydraulic actuating mechanism. So set up, the hydraulic pressure step control device and the operation machinery that this embodiment provided can realize the accurate control to hydraulic actuator, and are applicable to special operating mode environment. The derivation process of the beneficial effect is substantially similar to the derivation process of the beneficial effect brought by the hydraulic stepping control device, and is not described again here.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A hydraulic step control apparatus for step-controlling a hydraulic actuator of a working machine, comprising:
the cylinder piston mechanism comprises a cylinder (11) and a piston (17) arranged in the cylinder (11), wherein the piston (17) divides an inner cavity of the cylinder (11) into a first cavity and a second cavity;
a first oil passage (18) connected to an end of the first cavity;
a second oil passage (19) connected to an end of the second cavity;
the third oil path (20) is used for being connected with an oil source so as to input hydraulic medium into the inner cavity of the cylinder barrel (11);
the fourth oil circuit (21) is used for being connected with the hydraulic actuating mechanism so as to output hydraulic medium to the hydraulic actuating mechanism;
a direction-change valve assembly that is connected to the first oil passage (18), the second oil passage (19), the third oil passage (20), and the fourth oil passage (21), and that is switchable between a first state in which the third oil passage (20) communicates with the first oil passage (18) and the second oil passage (19) communicates with the fourth oil passage (21) and a second state in which the direction-change valve assembly is switched between the first state and the second state; in the second state, the third oil passage (20) communicates with the second oil passage (19), and the first oil passage (18) communicates with the fourth oil passage (21); and controlling the stepping action of the hydraulic actuator by repeatedly switching the reversing valve assembly between the first state and the second state.
2. The hydraulic step control apparatus according to claim 1, wherein the selector valve assembly further comprises a third state in which the third oil passage (20) communicates with the fourth oil passage (21).
3. The hydraulic step control device according to claim 1, further comprising:
a sensing unit for generating a sensing signal when the piston (17) is displaced to the end of the first cavity or to the end of the second cavity.
4. The hydraulic step control device according to claim 3, wherein the sensing unit comprises:
a first sensing module (15), wherein when the piston (17) is displaced to the terminal position of the first cavity, the first sensing module (15) generates a sensing signal;
a second sensing module (16), wherein the second sensing module (16) generates a sensing signal when the piston (17) is displaced to the end position of the second cavity.
5. The hydraulic step control device according to any one of claims 3 to 4, further comprising:
the counting module is electrically connected with the sensing unit and is used for respectively counting the times of the piston (17) moving to the first cavity terminal and the second cavity terminal;
and the control module is connected with the counting module and the reversing valve assembly and is used for controlling the reversing valve assembly according to the initial position and the target position of the hydraulic actuating mechanism so as to control the reciprocating times of the piston (17) to be displaced to the first cavity terminal and the second cavity terminal.
6. The hydraulic step control device according to claim 1, characterized in that the reversing valve assembly comprises a first reversing valve (12), the third oil channel (20) being connected to a first connection of the first reversing valve (12), the first oil channel (18) and the second oil channel (19) being connected to a second connection and a third connection, respectively, of the first reversing valve (12).
7. The hydraulic step control device according to claim 6, characterized in that the reversing valve assembly comprises a second reversing valve (13), the fourth oil channel (21) being connected to a first connection of the second reversing valve (13), the first oil channel (18) and the second oil channel (19) being connected to a second connection and a third connection of the second reversing valve (13), respectively.
8. The hydraulic step control device according to claim 7, characterized in that the reversing valve assembly comprises a third reversing valve (14), the third oil channel (20) being connected to a first connection of the third reversing valve (14) by a first branch (22), and the fourth oil channel (21) being connected to a second connection of the third reversing valve (14) by a second branch (23).
9. The hydraulic step control device according to claim 1, wherein the cylinder-piston mechanism, the first oil passage (18), the second oil passage (19), the third oil passage (20), the fourth oil passage (21), and the reversing valve assembly are integrated.
10. A work machine, comprising:
a hydraulic actuator;
the hydraulic step control device according to any one of claims 1-9, wherein the fourth oil passage (21) is connected to the hydraulic actuator.
CN202210874535.6A 2022-07-22 2022-07-22 Hydraulic step control device and working machine Pending CN115263854A (en)

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Application Number Priority Date Filing Date Title
CN202210874535.6A CN115263854A (en) 2022-07-22 2022-07-22 Hydraulic step control device and working machine
PCT/CN2023/104429 WO2024017012A1 (en) 2022-07-22 2023-06-30 Hydraulic stepping control device and working machine

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CN202210874535.6A CN115263854A (en) 2022-07-22 2022-07-22 Hydraulic step control device and working machine

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WO2024017012A1 (en) * 2022-07-22 2024-01-25 北京三一智造科技有限公司 Hydraulic stepping control device and working machine

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CN111577686B (en) * 2020-05-18 2022-03-29 广东志成电液科技有限公司 Stepping hydraulic equipment and control method thereof
CN111720375A (en) * 2020-07-30 2020-09-29 宁波埃科思注塑科技有限公司 Precision closed oil-way oil-electricity composite injection molding machine
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CN113819106B (en) * 2021-10-15 2024-04-19 洛阳普斯特智能机器人有限公司 Mechanical automatic reversing valve and use method thereof
CN115263854A (en) * 2022-07-22 2022-11-01 北京三一智造科技有限公司 Hydraulic step control device and working machine

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