CN113251017A - Flow regulation type oil pumping system, hydraulic crushing system and excavator - Google Patents
Flow regulation type oil pumping system, hydraulic crushing system and excavator Download PDFInfo
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- CN113251017A CN113251017A CN202110643757.2A CN202110643757A CN113251017A CN 113251017 A CN113251017 A CN 113251017A CN 202110643757 A CN202110643757 A CN 202110643757A CN 113251017 A CN113251017 A CN 113251017A
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
- E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a flow-regulating type oil pumping system, a hydraulic crushing system and an excavator, wherein the flow-regulating type oil pumping system comprises: the first plunger pump, the first adjusting oil cylinder, the feedback oil cylinder and the flow regulating valve; the telescopic end of the first adjusting oil cylinder is rotationally connected with a first swash plate of a first plunger pump, the oil outlet end of the first plunger pump is used for being communicated with a hydraulic driving accessory, and the telescopic end of the feedback oil cylinder is rotationally connected with the telescopic end of the first adjusting oil cylinder; the flow regulating valve controls the first plunger pump to output a first flow or a second flow, and the first flow is larger than the second flow. The invention controls the inclination angle of the first swash plate through the flow control valve, ensures the flow requirement of the hydraulic driving accessory and improves the working efficiency of the hydraulic driving accessory.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a flow-adjusting type oil pumping system, a hydraulic crushing system and an excavator.
Background
In the traditional operation process on the mine, explosive is often used for crushing the rock, and the blasting crushing mode has great potential safety hazard and environmental pollution, so that the excavator is used for carrying a hydraulic crushing hammer to crush the rock, and the blasting crushing mode is a development trend for replacing the blasting crushing operation on the current mine.
In the large-scale crushing operation process, the hydraulic crushing hammer is arranged at the executing tail end of an arm support of the excavator, and the head end of the arm support is arranged on a rotary support of the excavator. The arm support comprises a first movable arm and a second movable arm, one end of the first movable arm is connected with the hydraulic breaking hammer, the other end of the first movable arm is hinged with the second movable arm, and the other end of the second movable arm is connected with the rotary support.
In order to facilitate the implementation of crushing operation, the conventional medium-sized and large-sized excavators generally use a dual plunger pump with the same displacement to supply oil to the whole hydraulic system, and hydraulic oil output by a first plunger pump is mainly used for driving the rotation action of an arm support, the amplitude variation action of a first bucket rod and a second movable arm, the right-direction walking of the excavator and the crushing action of a hydraulic crushing hammer; the hydraulic oil output by the second plunger pump is mainly used for driving the amplitude variation action of the first movable arm and the second bucket arm and controlling the straight movement and the left movement of the excavator.
However, in the actual crushing operation process, the first plunger pump is only used for singly supplying hydraulic oil to the hydraulic crushing hammer, and the flow demand of the hydraulic crushing hammer cannot be met, so that in the oil path design, the second plunger pump is arranged to assist oil supply to the hydraulic crushing hammer under the control of the switching electromagnetic valve, and therefore confluence of oil supply paths of the two plunger pumps to the hydraulic crushing hammer is achieved. However, in order to ensure the crushing effect, the second plunger pump is often required to control the boom of the excavator to perform the pressing-down action through other oil passages, and when the boom is driven to perform the pressing-down action through the hydraulic oil passage, the overflow pressure on the hydraulic oil passage is determined by the overflow pressure of the hydraulic crushing hammer and is lower than the actual required pressure, which correspondingly reduces the crushing efficiency.
Disclosure of Invention
The invention provides a flow-adjusting type oil pumping system, a hydraulic crushing system and an excavator, which are used for solving the problem that the existing single plunger pump cannot meet the hydraulic oil supply flow requirement of a hydraulic driving accessory in the process of working on a mine.
The invention provides a flow-regulating oil pumping system, comprising: the first plunger pump, the first adjusting oil cylinder, the feedback oil cylinder and the flow regulating valve; the telescopic end of the first adjusting oil cylinder is rotatably connected with a first swash plate of the first plunger pump, and the oil outlet end of the first plunger pump is communicated with a hydraulic driving accessory; the telescopic end of the feedback oil cylinder is rotationally connected with the telescopic end of the first adjusting oil cylinder; the flow regulating valve has a first state and a second state; in the first state, the flow control valve is used for controlling the oil outlet end of the first plunger pump to be communicated with the feedback oil cylinder, and the first plunger pump outputs a first flow; in the second state, the flow control valve is used for controlling the feedback oil cylinder to be communicated with the oil tank, and the first plunger pump outputs a second flow; the first flow rate is greater than the second flow rate.
According to the flow-regulating type oil pumping system provided by the invention, the flow regulating valve is provided with a first oil control port, a second oil control port and a third oil control port; the first oil control port is communicated with the oil outlet end of the first plunger pump, the second oil control port is communicated with the oil tank, and the third oil control port is communicated with the feedback oil cylinder; in the first state, the first oil control port is communicated with the third oil control port; and in the second state, the first oil control port is communicated with the second oil control port.
According to the flow-rate-adjustable oil pumping system provided by the invention, the first adjusting oil cylinder is provided with a first oil supply passage; the first adjusting oil cylinder comprises a first adjusting piston, a first oil chamber and a second oil chamber; one end of the first adjusting piston extends into the first oil chamber, the other end of the first adjusting piston extends into the second oil chamber, and the middle part of the first adjusting piston is rotatably connected with the swash plate; the cross-sectional area of the first oil chamber is larger than that of the second oil chamber; the first oil supply path comprises a first oil supply valve, a first oil port of the first oil supply valve is used for communicating a pilot oil supply source, a second oil port of the first oil supply valve is used for communicating an oil tank, a third oil port of the first oil supply valve is used for communicating a first oil cavity, and the second oil cavity is communicated with a first oil port of the first oil supply valve.
According to the flow-adjusting type oil pumping system provided by the invention, the feedback oil cylinder comprises a feedback piston and a feedback oil cavity; one end of the feedback piston extends into the feedback oil cavity, the other end of the feedback piston is rotatably connected with the middle part of the first adjusting piston, and the feedback oil cavity is communicated with the third oil port of the flow regulating valve.
According to the flow-regulating oil pumping system provided by the invention, the first oil supply way further comprises a first proportional valve and a first one-way valve; the oil inlet end of the first proportional valve is communicated with the pilot oil supply source, the oil outlet end of the first proportional valve is communicated with the pilot end of the first oil supply valve, and the first proportional valve is used for controlling the valve rod of the first oil supply valve to be switched between a first position and a second position; when the valve rod is located at the first position, the first oil port of the first oil supply valve is communicated with the third oil port of the first oil supply valve; when the valve rod is located at the second position, the second oil port of the first oil supply valve is communicated with the third oil port of the first oil supply valve; the oil inlet end of the first one-way valve is used for being communicated with the pilot oil supply source, and the oil outlet end of the first one-way valve is communicated with the first oil cavity.
According to the invention, the flow-regulating oil pumping system further comprises: a second one-way valve; the oil inlet end of the second one-way valve is communicated with the oil outlet end of the first plunger pump, and the oil outlet end of the second one-way valve is communicated with the second oil cavity.
According to the invention, the flow-regulating oil pumping system further comprises: a first hydraulic valve block; the first hydraulic valve block comprises a plurality of first directional valves; the oil outlet end of the first plunger pump is respectively communicated with the oil inlet ends of the first reversing valves; one of the plurality of first directional valves is for communicating with the hydraulic drive attachment; and the other parts of the plurality of first reversing valves are used for being communicated with a first hydraulic execution assembly on the excavator, and the first hydraulic execution assembly comprises a first bucket rod oil cylinder, a second movable arm oil cylinder, a hydraulic swing mechanism and a right walking mechanism.
The present invention also provides a hydraulic crushing system, comprising: the hydraulic drive accessory, the hydraulic drive system and the flow-regulating type oil pumping system are arranged on the hydraulic drive accessory; the hydraulic driving accessory comprises a hydraulic breaking hammer; the oil outlet end of a first plunger pump of the flow-regulating type oil pumping system is communicated with the hydraulic breaking hammer; the hydraulic driving system comprises a second plunger pump, a second adjusting oil cylinder and a second hydraulic valve group, and the telescopic end of the second adjusting oil cylinder is rotatably connected with a second swash plate of the second plunger pump; the oil outlet end of the second plunger pump is used for outputting a third flow, and the third flow is equal to the second flow; the second hydraulic valve group comprises a plurality of second reversing valves; the oil outlet end of the second plunger pump is respectively communicated with the oil inlet ends of the second reversing valves; the second reversing valves are used for being communicated with a second hydraulic execution assembly on the excavator, and the second hydraulic execution assembly comprises a second bucket rod oil cylinder, a bucket oil cylinder, a first movable arm oil cylinder, a left walking mechanism and a straight walking mechanism.
According to the present invention there is provided a hydraulic crushing system further comprising: an oil replenishing pump; the oil inlet end of the oil supplementing pump is communicated with the oil tank, and the oil outlet end of the oil supplementing pump is communicated with the oil inlet end of the first plunger pump and the oil inlet end of the second plunger pump respectively.
The invention also provides an excavator, which comprises the hydraulic crushing system.
According to the flow-regulating type oil pumping system, the hydraulic crushing system and the excavator, the feedback oil cylinder and the flow regulating valve are arranged, under the condition that a hydraulic drive device has a high-power operation requirement, the flow regulating valve is controlled to be electrified, so that the first oil port and the third oil port of the flow regulating valve are communicated, the oil outlet end of the first plunger pump supplies oil to the feedback oil cylinder, and the telescopic end of the feedback oil cylinder drives the telescopic end of the first regulating oil cylinder to move to a left station, so that the inclination angle of the first swash plate is increased, the output flow of the first plunger pump is improved, and the first plunger pump outputs the first flow; under the condition that the hydraulic drive accessory does not have high-power operation demand, accessible control flow regulation and control valve loses the electricity, so that the second hydraulic fluid port and the third hydraulic fluid port intercommunication of flow regulation and control valve, because the end of giving vent to anger of first plunger pump no longer to feedback hydro-cylinder fuel feeding, then the flexible end of feedback hydro-cylinder can take place the reverse displacement, so that the automatic oil tank that flows back of hydraulic oil in the feedback hydro-cylinder, when the flexible end reverse displacement of feedback hydro-cylinder, can drive the flexible end of first regulation hydro-cylinder correspondingly and move station right, lead to the inclination of first sloping cam plate to reduce, thereby reduce the output flow of first plunger pump, until first plunger pump output second flow.
Therefore, the flow-adjusting type oil pumping system can control the first plunger pump to pump two types of hydraulic oil with different flow rates according to the actual working requirement of the hydraulic driving accessory, and ensures the hydraulic flow requirement of the hydraulic driving accessory and improves the working efficiency of the hydraulic driving accessory under the condition that the first plunger pump outputs the first flow rate.
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 a schematic diagram of a hydraulic configuration of a flow regulated oil pumping system according to the present invention;
FIG. 2 is a schematic diagram of the hydraulic configuration of the hydraulic fracturing system provided by the present invention;
FIG. 3 is an enlarged schematic view of FIG. 2 at A in accordance with the present invention;
reference numerals:
1: a first plunger pump; 2: a first adjusting oil cylinder; 201: a first regulating piston;
202: a first oil chamber; 203: a second oil chamber; 3: a feedback oil cylinder;
31: a feedback piston; 32: a feedback oil cavity; 33: a flow regulating valve;
4: a first oil supply valve; 5: a hydraulic breaking hammer; 6: a first proportional valve;
7: a first check valve; 71: a second one-way valve; 8: a first hydraulic valve block;
801: a first direction changing valve; 9: an oil replenishing pump; 11: a second plunger pump;
21: a second adjusting oil cylinder; 211: a second regulating piston; 212: a third oil chamber;
213: a fourth oil chamber; 41: second oil supply valve 61: a second proportional valve;
81: a second hydraulic valve block; 811: and a second direction changing valve.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a flow-rate-adjustable oil pumping system, a hydraulic crushing system and an excavator provided by the invention with reference to fig. 1 to 3.
As shown in fig. 1, the present embodiment provides a flow-rate-adjustable oil pumping system, a hydraulic crushing system and an excavator, wherein the flow-rate-adjustable oil pumping system includes: the device comprises a first plunger pump 1, a first adjusting oil cylinder 2, a feedback oil cylinder 3 and a flow regulating valve 33; the telescopic end of the first adjusting oil cylinder 2 is rotatably connected with a first swash plate of the first plunger pump 1 so as to adjust the inclination angle of the first swash plate, the oil outlet end of the first plunger pump 1 is communicated with a hydraulic driving accessory, and the telescopic end of the feedback oil cylinder 3 is rotatably connected with the telescopic end of the first adjusting oil cylinder 2; the flow regulating valve 33 has a first state and a second state; in a first state, the flow control valve 33 is used for controlling the oil outlet end of the first plunger pump 1 to be communicated with the feedback oil cylinder 3, and the first plunger pump 1 outputs a first flow; in a second state, the flow regulating valve 33 is used for controlling the communication between the feedback oil cylinder 3 and the oil tank, and the first plunger pump 1 outputs a second flow; the first flow rate is greater than the second flow rate.
Specifically, in the flow-rate-adjustable oil pumping system shown in this embodiment, by providing the feedback oil cylinder 3 and the flow-rate-adjustable valve 33, under the condition that the hydraulic drive device has a high-power operation requirement, the flow-rate-adjustable valve 33 is controlled to be energized, so that the oil outlet end of the first plunger pump 1 supplies oil to the feedback oil cylinder 3, and the telescopic end of the feedback oil cylinder 3 drives the telescopic end of the first adjusting oil cylinder 2 to move to the left station, so that the inclination angle of the first swash plate is increased, and the output flow rate of the first plunger pump 1 is increased until the first plunger pump 1 outputs the first flow rate; under the condition that the hydraulic drive accessory does not have high-power operation demand, the accessible control flow regulation and control valve 33 loses the electricity, because the oil outlet end of first plunger pump 1 no longer supplies oil to feedback hydro-cylinder 3, the flexible end of feedback hydro-cylinder 3 can take place reverse movement, so that the automatic oil tank that flows back of hydraulic oil in the feedback hydro-cylinder 3, when the flexible end reverse movement of feedback hydro-cylinder 3, can drive the flexible end of first regulation hydro-cylinder 2 correspondingly and move to station right, lead to the inclination of first sloping cam plate to reduce, thereby reduce the output flow of first plunger pump 1, until first plunger pump 1 outputs the second flow. Therefore, the flow-adjusting type oil pumping system shown in the embodiment can control the first plunger pump 1 to pump two types of hydraulic oil with different flow rates according to the actual working requirement of the hydraulic driving accessory, and ensure the hydraulic flow requirement of the hydraulic driving accessory and improve the working efficiency of the hydraulic driving accessory under the condition that the first plunger pump 1 outputs the first flow rate.
It should be noted that the first plunger pump 1 shown in this embodiment is an axial plunger pump, the first plunger pump 1 includes a transmission shaft, a swash plate, plungers and a cylinder block, an included angle between a normal line of the swash plate and an axis of the cylinder block is a swash plate inclination angle, the plungers are uniformly distributed in the cylinder block, one end of the plunger extends to a plunger cavity of the cylinder block, under the condition that the plunger cavity is filled with hydraulic oil, the other end of the plunger is tightly pressed on the swash plate, the transmission shaft is used for driving the plungers to rotate along with the cylinder block, so as to drive the plungers to reciprocate in the plunger cavities, when the plungers move towards one side close to the swash plate, negative pressure generated in the plunger cavities sucks the hydraulic oil into the plunger cavities, when the plungers move towards one side far away from the swash plate, the positive pressure generated in the plunger cavities presses out the hydraulic oil in the plunger cavities, the plungers reciprocate once per revolution of the cylinder block, and the plunger cavities complete sucking and pressing oil once; by changing the size of the first swash plate inclination angle, the plunger stroke length can be changed, thereby changing the displacement of the first plunger pump 1.
The hydraulic driving accessory comprises a hydraulic breaking hammer, a bucket oil cylinder and the like, the bucket oil cylinder is installed at the executing tail end of an excavator arm frame, and the bucket oil cylinder is used for driving a bucket to carry out excavating operation under the condition that the hydraulic driving accessory has excavating operation requirements; under the condition that the hydraulic driving part has a crushing operation requirement, the oil outlet end of the first plunger pump is used for driving the hydraulic crushing hammer to perform crushing operation.
Preferably, as shown in fig. 1, the flow rate control valve 33 shown in this embodiment has a first oil control port, a second oil control port and a third oil control port; the first oil control port is communicated with the oil outlet end of the first plunger pump 1, the second oil control port is communicated with the oil tank, and the third oil control port is communicated with the feedback oil cylinder 3; in a first state, the first oil control port is communicated with the third oil control port; in the second state, the first oil control port is communicated with the second oil control port.
Preferably, as shown in fig. 1, the first adjustment cylinder 2 shown in the present embodiment is provided with a first oil supply passage; the first adjusting cylinder 2 includes a first adjusting piston 201, a first oil chamber 202, and a second oil chamber 203; one end of the first adjusting piston 201 extends into the first oil chamber 202, the other end of the first adjusting piston 201 extends into the second oil chamber 203, and the middle part of the first adjusting piston 201 is rotatably connected with the first swash plate; the cross-sectional area of the first oil chamber 202 is larger than that of the second oil chamber 203; the first oil supply path comprises a first oil supply valve 4, a first oil port of the first oil supply valve 4 is used for being communicated with a pilot oil supply source, a second oil port of the first oil supply valve 4 is used for being communicated with an oil tank, a third oil port of the first oil supply valve 4 is used for being communicated with a first oil cavity 202, and a second oil cavity 203 is communicated with the first oil port of the first oil supply valve 4.
Specifically, as shown in fig. 1, when the first oil supply valve 4 shown in this embodiment is in the left position, the second oil port of the first oil supply valve 4 is communicated with the third oil port of the first oil supply valve 4, the hydraulic oil in the first oil chamber 202 returns to the oil tank through the second oil port, and meanwhile, the second oil chamber 203 is supplied with oil by the pilot oil supply source, and the first adjusting piston 201 moves leftward, so that the inclination angle of the first swash plate is increased; under the condition that the first oil supply valve 4 is in the right position, a first oil port of the first oil supply valve 4 is communicated with a third oil port of the first oil supply valve 4, the first oil chamber 202 and the second oil chamber 203 are both communicated with a pilot oil supply source, and as the cross-sectional area of the first oil chamber 202 is larger than that of the second oil chamber 203, the first adjusting piston 201 moves rightwards according to the hydraulic cylinder differential connection principle, so that the inclination angle of the first swash plate is reduced; the position of the first adjusting piston 201 is adjusted by controlling the operating position of the first oil supply valve 4, thereby changing the inclination angle of the first swash plate, and the adjustment of the displacement of the first plunger pump 1 is achieved.
Preferably, as shown in fig. 1, the feedback cylinder 3 shown in the present embodiment includes a feedback piston 31 and a feedback oil chamber 32; one end of the feedback piston 31 extends into the feedback oil chamber 32, the other end of the feedback piston 31 is rotatably connected with the middle part of the first adjusting piston 201, and the feedback oil chamber 32 is communicated with the third oil port of the flow control valve 33.
Specifically, as shown in fig. 1, in the case that the hydraulic breaking hammer 5 shown in this embodiment performs a high-power breaking operation, the first oil port of the flow control valve 33 is controlled to be communicated with the third oil port of the flow control valve 33, a part of hydraulic oil output from the oil outlet end of the first plunger pump 1 enters the feedback oil cavity 32, the feedback piston 31 moves leftward, and then the first adjusting piston 201 is pushed to move leftward, so that the inclination angle of the first swash plate is increased, and the purpose of increasing the displacement of the first plunger pump 1 is achieved.
Preferably, as shown in fig. 1, the first oil supply path shown in the present embodiment further includes a first proportional valve 6 and a first check valve 7; the oil inlet end of the first proportional valve 6 is used for being communicated with a pilot oil supply source, the oil outlet end of the first proportional valve 6 is communicated with the pilot end of the first oil supply valve 4, and the first proportional valve 6 is used for controlling the valve rod of the first oil supply valve 4 to be switched between a first position and a second position; when the valve rod is at the first position, the first oil port of the first oil supply valve 4 is communicated with the third oil port of the first oil supply valve 4; in the case that the valve stem is in the second position, the second oil port of the first oil supply valve 4 is communicated with the third oil port of the first oil supply valve 4; the oil inlet end of the first check valve 7 is used for being communicated with a pilot oil supply source, and the oil outlet end of the first check valve 7 is communicated with the first oil chamber 202.
It should be noted that the first proportional valve 6 changes the flow of the hydraulic oil flowing out of the first oil supply valve 4 by changing the magnitude of the control current, and then controls the valve rod of the first oil supply valve 4 to switch between the first position and the second position, the hydraulic oil enters the first adjusting cylinder 2 through the first oil supply valve 4, the telescopic end of the first adjusting cylinder 2 drives the first swash plate to swing, and the displacement of the first plunger pump 1 is adjusted through the first proportional valve 6; the pilot oil supply source supplies oil to the first oil chamber 202 in one direction through the first check valve 7.
Preferably, as shown in fig. 1, the present embodiment is further provided with a second check valve 71, an oil inlet end of the second check valve 71 is communicated with an oil outlet end of the first plunger pump 1, and an oil outlet end of the second check valve 71 is communicated with the second oil chamber 203.
Specifically, in the process of increasing the inclination angle of the swash plate from a small value, the left position of the first oil supply valve 4 is connected to the first oil supply path, the second oil port of the first oil supply valve 4 is communicated with the third oil port, hydraulic oil of the pilot oil supply source is supplied to the second oil chamber 203 in a one-way mode through the first check valve 7, meanwhile, hydraulic oil at the oil outlet end of the first plunger pump 1 is supplied to the second oil chamber 203 in a one-way mode through the second check valve 71, and the first adjusting piston 201 moves leftwards quickly; in the process of adjusting the inclination angle of the swash plate from large to small, the right position of the first oil supply valve 4 is connected into the first oil supply path, the first oil port and the third oil port of the first oil supply valve 4 are communicated, hydraulic oil of the pilot oil supply source is supplied to the first oil chamber 202 in a one-way mode through the first check valve 7, and at the moment, the stable movement of the first adjusting piston 201 cannot be met by supplying oil to the first oil chamber 202 only through the pilot oil supply source, so that the hydraulic oil at the oil outlet end of the first plunger pump 1 is connected into the first oil chamber 202 through the second check valve 71, and the pilot oil supply source and the first plunger pump 1 are used for supplying oil to the first oil chamber 202 together.
Preferably, as shown in fig. 1, the flow control valve 33 shown in this embodiment is a two-position three-way solenoid valve, and the first oil supply valve 4 is a three-position three-way reversing valve.
Preferably, as shown in fig. 2, the flow-rate-adjusting type oil pumping system of the present embodiment further includes a first hydraulic valve group 8; the first hydraulic valve group 8 comprises a plurality of first reversing valves 801, and the oil outlet end of the first plunger pump 1 is respectively communicated with the oil inlet ends of the plurality of first reversing valves 801; one of the plurality of first direction valves 801 is used for communication with a hydraulic drive attachment; the other parts of the plurality of first reversing valves 801 are used for communicating with a first hydraulic execution assembly on the excavator, and the first hydraulic execution assembly comprises a first bucket rod oil cylinder, a second movable arm oil cylinder, a hydraulic swing mechanism and a right walking mechanism.
It should be noted here that the first stick cylinder is used to control the digging and unloading action of the first stick; the second movable arm oil cylinder is used for controlling the lifting action of a second movable arm; the hydraulic swing mechanism is used for controlling the swing action of the excavator boom on the base; the right walking mechanism is used for controlling the right walking action of the excavator.
Preferably, as shown in fig. 2 and 3, the present embodiment further provides a hydraulic crushing system comprising: the hydraulic drive accessory, the hydraulic drive system and the flow-regulating type oil pumping system are arranged on the hydraulic drive accessory; the hydraulic driving accessory comprises a hydraulic breaking hammer 5, and the oil outlet end of a first plunger pump of the flow-adjusting type oil pumping system is communicated with the hydraulic breaking hammer 5; the hydraulic driving system comprises a second plunger pump 11, a second adjusting oil cylinder 21 and a second hydraulic valve group 81, wherein the telescopic end of the second adjusting oil cylinder 21 is rotatably connected with a second swash plate of the second plunger pump 11 so as to adjust the inclination angle of the second swash plate; the oil outlet end of the second plunger pump 11 is used for outputting a third flow, and the third flow is equal to the second flow; the second hydraulic valve group 81 includes a plurality of second direction valves 811; the oil outlet end of the second plunger pump 11 is respectively communicated with the oil inlet ends of a plurality of second reversing valves 811; the plurality of second direction valves 811 are used for communicating with a second hydraulic actuator on the excavator, and the second hydraulic actuator includes a second arm cylinder, a bucket cylinder, a first boom cylinder, a left travel mechanism, and a straight travel mechanism.
Specifically, under the condition that the hydraulic breaking hammer 5 performs a low-power breaking action, the output flow rates of the first plunger pump 1 and the second plunger pump 11 are the same, so that the traveling speeds of a left traveling mechanism and a right traveling mechanism of the excavator are the same; under the condition that hydraulic breaking hammer 5 carries out high-power crushing operation, first plunger pump 1 increases the discharge capacity and supplies oil for hydraulic breaking hammer 5 alone, and meanwhile, second plunger pump 11 provides the power of pushing down for first swing arm, under the combined action of first plunger pump 1 and second plunger pump 11, has improved crushing efficiency.
In addition, under the condition that the excavator has the requirement of traveling leftwards, rightwards or linearly, the output flow rates of the first plunger pump 1 and the second plunger pump 11 are adjusted to be in a consistent state, the displacement of hydraulic oil conveyed by the leftwards traveling mechanism and the displacement of hydraulic oil conveyed by the rightwards traveling mechanism are equal, and the traveling speeds of the leftwards traveling mechanism and the rightwards traveling mechanism are the same.
The telescopic end of the second adjusting oil cylinder 21 is rotatably connected with the second swash plate, and the telescopic end of the second adjusting oil cylinder 21 is used for adjusting the inclination angle of the second swash plate to realize the adjustment of the flow of the second plunger pump 11; the second bucket rod oil cylinder is used for controlling the excavation and unloading actions of the second bucket rod; the bucket oil cylinder is used for controlling the digging and unloading actions of the bucket; the first movable arm oil cylinder is used for controlling the lifting action of the first movable arm; the left walking mechanism is used for controlling the right walking action of the excavator; the straight-moving mechanism is used for controlling the straight-moving action of the excavator.
It should be noted here that when the hydraulic breaker 5 is mounted on the excavator, it is necessary to remove the bucket of the excavator and communicate the first direction change valve 801 for controlling the hydraulic breaker 5 with the hydraulic breaker 5.
Preferably, as shown in fig. 3, the second plunger pump 11 shown in the present embodiment has the same structure as the first plunger pump 1, the second adjusting cylinder 21 has the same structure as the first adjusting cylinder 2, and the second adjusting cylinder 21 includes a second adjusting piston 211, a third oil chamber 212, and a fourth oil chamber 213; the second oil supply valve 41 has the same structure as the first oil supply valve 4, a first oil port of the second oil supply valve 41 is used for communicating with a pilot oil supply source, a second oil port of the second oil supply valve 41 is used for communicating with an oil tank, a third oil port of the second oil supply valve 41 is used for communicating with a fourth oil chamber 213, and a third oil chamber 212 is used for communicating with the pilot oil supply source; the oil outlet end of the second proportional valve 61 communicates with the pilot end of the second oil supply valve, and the second proportional valve 61 is used for controlling the valve rod of the second oil supply valve 41 to switch between different positions.
Wherein one end of the second adjusting piston 211 extends into the third oil chamber 212, the other end of the second adjusting piston 211 extends into the fourth oil chamber 213, and the cross-sectional area of the third oil chamber 212 is smaller than that of the fourth oil chamber 213.
Specifically, in the case where the second oil supply valve 41 is in the left position, the third oil chamber 212 and the fourth oil chamber 213 are both communicated with the pilot oil supply source, and since the cross-sectional area of the third oil chamber 212 is smaller than that of the fourth oil chamber 213, the second adjusting piston 211 is moved leftward according to the hydraulic cylinder differential connection principle, thereby reducing the second swash plate angle; when the second oil supply valve 41 is in the right position, the fourth oil chamber 213 communicates with the oil tank, the third oil chamber 212 communicates with the pilot oil supply source, and the second adjusting piston 211 moves rightward, thereby increasing the second swash plate angle; the position of the second adjusting piston 211 is adjusted by controlling the operation position of the second oil supply valve 41 to thereby change the inclination angle of the second swash plate, thereby achieving the adjustment of the displacement volume of the second plunger pump 11.
Preferably, as shown in fig. 2 and 3, the hydraulic crushing system shown in the present embodiment further includes an oil replenishment pump 9; the oil inlet end of the oil replenishing pump 9 is communicated with the oil tank, the oil outlet end of the oil replenishing pump 9 is communicated with the oil inlet end of the first plunger pump 1 and the oil inlet end of the second plunger pump 11 respectively, and the oil replenishing pump 9 is used for ensuring that the oil inlet ends of the first plunger pump 1 and the second plunger pump 11 have a stable oil inlet state.
Preferably, the present embodiment also includes an excavator comprising a hydraulic crushing system as described above.
The hydraulic oil output by the first plunger pump 1 shown in the present embodiment is used to drive the excavating and unloading operation of the first arm, the lifting operation of the second boom, the swing operation of the second boom, the forward and backward movement of the excavator, and the rightward walking of the excavator on the excavator; the hydraulic oil output from the second plunger pump 11 is used to drive the excavating and discharging operation of the second arm, the excavating and discharging operation of the bucket, the raising and lowering operation of the first boom, the forward and backward movement operation of the excavator, the rightward movement of the excavator, and the linear movement of the excavator.
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 flow regulating oil pumping system comprising: first plunger pump and first regulation hydro-cylinder, the flexible end of first regulation hydro-cylinder with the first sloping cam plate of first plunger pump rotates and connects, the end of producing oil of first plunger pump is used for and hydraulic drive accessory intercommunication, its characterized in that still includes: a feedback oil cylinder and a flow regulating valve;
the telescopic end of the feedback oil cylinder is rotationally connected with the telescopic end of the first adjusting oil cylinder;
the flow regulating valve has a first state and a second state; in the first state, the flow control valve is used for controlling the oil outlet end of the first plunger pump to be communicated with the feedback oil cylinder, and the first plunger pump outputs a first flow; in the second state, the flow control valve is used for controlling the feedback oil cylinder to be communicated with the oil tank, and the first plunger pump outputs a second flow; the first flow rate is greater than the second flow rate.
2. The flow regulated oil pumping system of claim 1,
the flow regulating valve is provided with a first oil control port, a second oil control port and a third oil control port; the first oil control port is communicated with the oil outlet end of the first plunger pump, the second oil control port is communicated with the oil tank, and the third oil control port is communicated with the feedback oil cylinder;
in the first state, the first oil control port is communicated with the third oil control port; and in the second state, the first oil control port is communicated with the second oil control port.
3. The flow regulated oil pumping system of claim 1,
the first adjusting oil cylinder is provided with a first oil supply way;
the first adjusting oil cylinder comprises a first adjusting piston, a first oil chamber and a second oil chamber; two ends of the first adjusting piston respectively extend into the first oil cavity and the second oil cavity; the middle part of the first adjusting piston is rotationally connected with the first swash plate;
the first oil supply path comprises a first oil supply valve, a first oil port of the first oil supply valve is used for communicating a pilot oil supply source, a second oil port of the first oil supply valve is used for communicating an oil tank, a third oil port of the first oil supply valve is used for communicating a first oil cavity, and the second oil cavity is communicated with a first oil port of the first oil supply valve.
4. The flow regulated oil pumping system of claim 3,
the feedback oil cylinder comprises a feedback piston and a feedback oil cavity;
one end of the feedback piston extends into the feedback oil cavity, the other end of the feedback piston is rotatably connected with the middle part of the first adjusting piston, and the feedback oil cavity is communicated with the third oil port of the flow regulating valve.
5. The flow regulated oil pumping system of claim 3,
the first oil supply path also comprises a first proportional valve and a first one-way valve;
the oil inlet end of the first proportional valve is used for being communicated with the pilot oil supply source, the oil outlet end of the first proportional valve is communicated with the pilot end of the first oil supply valve, and the first proportional valve is used for controlling the valve rod of the first oil supply valve to be switched between a first position and a second position;
when the valve rod is located at the first position, the first oil port of the first oil supply valve is communicated with the third oil port of the first oil supply valve; when the valve rod is located at the second position, the second oil port of the first oil supply valve is communicated with the third oil port of the first oil supply valve;
the oil inlet end of the first one-way valve is used for being communicated with the pilot oil supply source, and the oil outlet end of the first one-way valve is communicated with the first oil cavity.
6. The flow regulated oil pumping system of claim 3,
further comprising: a second one-way valve;
the oil inlet end of the second one-way valve is communicated with the oil outlet end of the first plunger pump, and the oil outlet end of the second one-way valve is communicated with the second oil cavity.
7. The flow-regulated oil pumping system according to any one of claims 1 to 6, further comprising: a first hydraulic valve block;
the first hydraulic valve block comprises a plurality of first directional valves; the oil outlet end of the first plunger pump is respectively communicated with the oil inlet ends of the first reversing valves; one of the plurality of first directional valves is for communicating with the hydraulic drive attachment; the other of the plurality of first directional valves is adapted to communicate with a first hydraulic implement assembly on the excavator.
8. A hydraulic fracturing system, comprising: a hydraulic drive attachment, a hydraulic drive system, and a flow-rate regulated oil pumping system as claimed in any one of claims 1 to 7; the hydraulic driving accessory comprises a hydraulic breaking hammer;
the oil outlet end of a first plunger pump of the flow-regulating type oil pumping system is communicated with the hydraulic breaking hammer;
the hydraulic driving system comprises a second plunger pump, a second adjusting oil cylinder and a second hydraulic valve group, and the telescopic end of the second adjusting oil cylinder is rotatably connected with a second swash plate of the second plunger pump; the oil outlet end of the second plunger pump is used for outputting a third flow, and the third flow is equal to the second flow;
the second hydraulic valve group comprises a plurality of second reversing valves; the oil outlet end of the second plunger pump is respectively communicated with the oil inlet ends of the second reversing valves; the plurality of second directional valves are adapted to communicate with a second hydraulic implement assembly on the excavator.
9. The hydraulic crushing system of claim 8,
further comprising: an oil replenishing pump;
the oil inlet end of the oil supplementing pump is communicated with the oil tank, and the oil outlet end of the oil supplementing pump is communicated with the oil inlet end of the first plunger pump and the oil inlet end of the second plunger pump respectively.
10. Excavator, characterized in that it comprises a hydraulic crushing system according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643757.2A CN113251017A (en) | 2021-06-09 | 2021-06-09 | Flow regulation type oil pumping system, hydraulic crushing system and excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643757.2A CN113251017A (en) | 2021-06-09 | 2021-06-09 | Flow regulation type oil pumping system, hydraulic crushing system and excavator |
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| CN113251017A true CN113251017A (en) | 2021-08-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115653045A (en) * | 2022-11-17 | 2023-01-31 | 徐州徐工矿业机械有限公司 | Excavator flow converging valve and control method |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115653045A (en) * | 2022-11-17 | 2023-01-31 | 徐州徐工矿业机械有限公司 | Excavator flow converging valve and control method |
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