CN113339341A - Hydraulic system and hydraulic support - Google Patents
Hydraulic system and hydraulic support Download PDFInfo
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- CN113339341A CN113339341A CN202110626101.XA CN202110626101A CN113339341A CN 113339341 A CN113339341 A CN 113339341A CN 202110626101 A CN202110626101 A CN 202110626101A CN 113339341 A CN113339341 A CN 113339341A
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- 239000007788 liquid Substances 0.000 claims description 40
- 239000000839 emulsion Substances 0.000 claims description 27
- 230000001502 supplementing effect Effects 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 238000004904 shortening Methods 0.000 abstract 1
- 230000009471 action Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 238000005065 mining Methods 0.000 description 7
- 239000002828 fuel tank Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002637 fluid replacement therapy Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/512—Arrangement of valves
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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
- F15B11/22—Synchronisation of the movement of 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
- F15B13/02—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
- 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
- F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic system and a hydraulic support, wherein the hydraulic system comprises a main pump station, a hydraulic upright post, a main valve body and a closed oil tank, the main pump station is provided with an oil inlet and an oil outlet, the hydraulic upright post comprises a rod cavity and a rodless cavity which are communicated with each other, the oil inlet and the oil outlet are both communicated with the main valve body, the main valve body comprises a first working oil port and a second working oil port, the first working oil port is communicated with the rod cavity, the second working oil port is communicated with the rodless cavity, and the closed oil tank is respectively communicated with the main valve body, the oil inlet and the oil outlet. The hydraulic system provided by the embodiment of the invention reduces the required power of the pump station, is convenient for installing the main pump station on the support, and can effectively improve the frame lifting speed and the frame lowering speed of the hydraulic support, thereby greatly shortening the time required by the whole frame moving process of the hydraulic support and improving the frame moving efficiency.
Description
Technical Field
The invention relates to the technical field of mining equipment, in particular to a hydraulic system and a hydraulic support.
Background
The hydraulic support mainly supports a top plate of a fully mechanized mining surface of a thin coal seam well, and is matched with a coal mining machine and a scraper conveyor to finish automatic mining of coal.
In the related technology, the speed of the coal mining machine is faster and faster, and the frame moving speed of the centralized liquid supply hydraulic support cannot keep up with the traction speed of the coal mining machine, because the distance between a pump station and the support is longer, pressure loss is caused when emulsion is transmitted in a long distance, and the maximum pressure loss can reach about 5 MPa. In addition, because the area ratio between the rod cavity and the rodless cavity of the upright column is large, the pressure of the rodless cavity is small in the frame lowering process, and the back pressure of the pipeline is too large, a large amount of liquid is difficult to return quickly in the frame lowering process, so that the frame lowering time of the traditional hydraulic support is too long. If a distributed liquid supply mode is adopted, namely, each hydraulic support is provided with a pump station, pressure drop caused by overlong hydraulic pipes can be reduced, but the space of a fully mechanized mining face is narrow, and if the requirements of support initial force and rapid movement are met, the required pump station has higher power and is difficult to install on the support. In addition, when the hydraulic support pushes away to slide, due to the hysteresis of the emulsion, the pushing distance is not accurate enough due to the adoption of the hydraulic cylinder, and the working face is not easy to straighten.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a hydraulic system for a hydraulic support with distributed liquid supply, and the hydraulic system can effectively improve the lifting speed of the hydraulic support and reduce the power of a pump station.
The embodiment of the invention also provides a hydraulic support with the hydraulic system.
The hydraulic system comprises a main pump station, a hydraulic upright, a main valve body and a closed oil tank, wherein the main pump station is provided with an oil inlet and an oil outlet, the hydraulic upright comprises a rod cavity and a rodless cavity which are communicated with each other, the oil inlet and the oil outlet are both communicated with the main valve body, the main valve body comprises a first working oil port and a second working oil port, the first working oil port is communicated with the rod cavity, the second working oil port is communicated with the rodless cavity, and the closed oil tank is respectively communicated with the main valve body, the oil inlet and the oil outlet.
According to the hydraulic system provided by the embodiment of the invention, the required power of the pump station is reduced, the size of the required pump station is further reduced, and the main pump station is convenient to mount on the support.
In some embodiments, the main valve body is a three-position, four-way valve, the main valve body being changeable between a first position, a second position, and a third position; at the first position, the first working oil port is communicated with the oil outlet, and the second working oil port is communicated with the oil inlet; at the second position, the first working oil port and the second working oil port are both communicated with the oil inlet; and at the third position, the first working oil port is communicated with the oil inlet, and the second working oil port is communicated with the oil outlet.
In some embodiments, the hydraulic columns include a first hydraulic column and a second hydraulic column, the rod cavities of the first hydraulic column and the second hydraulic column are both in communication with the first working oil port, and the rodless cavity of the first hydraulic column and the rodless cavity of the second hydraulic column are both in communication with the second working oil port.
In some embodiments, the closed fuel tanks include a first closed fuel tank and a second closed fuel tank, both the first closed fuel tank and the second closed fuel tank being in communication with the main valve body, the oil inlet, and the oil outlet.
In some embodiments, the hydraulic system further comprises a fluid replacement pump station in communication with the oil inlet and the oil outlet, respectively.
In some embodiments, the hydraulic system further includes a first hydraulic check valve and a second hydraulic check valve, the first hydraulic check valve is disposed on a connection pipeline between the rodless cavity of the first hydraulic column and the second working oil port, a control oil port of the first hydraulic check valve is communicated with the rod cavity of the first hydraulic column, the second hydraulic check valve is disposed on a connection pipeline between the rodless cavity of the second hydraulic column and the second working oil port, and a control oil port of the second hydraulic check valve is communicated with the rod cavity of the second hydraulic column.
In some embodiments, the hydraulic system further comprises a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve, wherein the first one-way valve is arranged on a connecting pipeline between the oil outlet and the main valve body to prevent the emulsion from flowing back to the main pump station; the second one-way valve is arranged on a connecting pipeline between the liquid supplementing pump station and the oil outlet so as to prevent the emulsion from flowing back to the liquid supplementing pump station; the third one-way valve is arranged on a connecting pipeline between the liquid supplementing pump station and the oil inlet so as to prevent the emulsion from flowing back to the liquid supplementing pump station; and the fourth one-way valve is arranged on a connecting pipeline between the closed oil tank and the oil outlet of the main pump station so as to enable the emulsion to flow back to the closed oil tank.
According to another aspect of the invention, the hydraulic support comprises the hydraulic system of any one of the embodiments, the hydraulic support further comprises a base, a top beam and an electric pushing cylinder, the lower end of the hydraulic upright is connected with the base, the upper end of the hydraulic upright is connected with the top beam, the main pump station and the closed oil tank are both arranged on the upper surface of the base, and one end of the electric pushing cylinder is hinged with the base.
In some embodiments, the hydraulic support further comprises a shield beam, a first connecting rod and a second connecting rod, wherein a first end of the shield beam is hinged to one end of the top beam, a second end of the shield beam is hinged to the first end of the first connecting rod, a second end of the first connecting rod is hinged to one end of the base, a first end of the second connecting rod is hinged to the base, and a second end of the second connecting rod is hinged to the middle of the shield beam.
In some embodiments, the hydraulic support further comprises a balance adjusting cylinder, one end of the balance adjusting cylinder is hinged with the top beam, and the other end of the balance adjusting cylinder is hinged with the shield beam.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of a hydraulic mount according to another aspect of an embodiment of the present invention;
fig. 3 is a schematic diagram of the arrangement of a hydraulic mount on a work surface according to another aspect of the embodiment of the present invention.
Reference numerals:
the main pump station 1 is connected to the main pump station,
a first hydraulic column 21, a second hydraulic column 22, a rod chamber 23, a rodless chamber 24,
the main valve body 3 is provided with a valve body,
the first closed tank 41, the second closed tank 42,
a liquid supplementing pump station 5 is arranged on the upper part of the device,
a first pilot operated check valve 61, a second pilot operated check valve 62, a first check valve 63, a second check valve 64, a third check valve 65, a fourth check valve 66,
a first relief valve 71, a second relief valve 72, a first relief valve 73, a second relief valve 74, a first strainer 75, a second strainer 76,
the base plate (8) is provided with a base,
the top beam 9 is provided with a top beam,
the electric push cylinder (10) is driven by the motor,
the shield beam 11 is provided with a shield beam,
the first link (12) is provided with a first connecting rod,
the second connecting rod 13 is connected to the second connecting rod,
the balancing cylinder 14.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A hydraulic system according to an embodiment of the invention is described below with reference to the accompanying drawings.
As shown in fig. 1, the hydraulic system according to the embodiment of the present invention is mainly applied to hydraulic supports, and the hydraulic system includes a main pump station 1, a hydraulic column, a main valve body 3 and a closed oil tank, where the hydraulic column is an actuator, the main pump station 1 is configured to provide an emulsion to the hydraulic column to power the hydraulic column to raise or lower the column, each hydraulic support has one main pump station 1, so as to reduce pressure loss of the emulsion during transmission, in this way, the main valve body 3 is configured to control a flow direction of the emulsion.
The hydraulic upright comprises a rod cavity 23 and a rodless cavity 24 which are communicated with each other, when the main pump station 1 supplies liquid to the rod cavity 23, the hydraulic upright descends to drive the hydraulic support to descend, and when the main pump station 1 supplies liquid to the rodless cavity 24, the hydraulic upright ascends to drive the hydraulic support to ascend.
The main pump station 1 is provided with an oil inlet and an oil outlet, the oil inlet and the oil outlet are both communicated with the main valve body 3, the main valve body 3 comprises a first working oil port and a second working oil port, the first working oil port is communicated with the rod cavity 23, the second working oil port is communicated with the rodless cavity 24, when the frame descending operation is carried out, the main pump station 1 supplies liquid to the rod cavity 23 through the first working oil port, and emulsion in the rodless cavity 24 flows back to the main pump station 1 through the second working oil port; similarly, when the rack lifting operation is performed, the main pump station 1 supplies liquid to the rodless cavity 24 through the second working oil port, and the emulsion in the rod cavity 23 flows back to the main pump station 1 through the first working oil port.
The closed oil tank communicates with main valve body 3, oil inlet and oil-out respectively, and the pressure that the hydraulic pressure stand produced when falling the post can give closed oil tank energy storage, and in partial emulsion flowed into closed oil tank when falling the post, when rising the frame, closed oil tank release pressure to because of the no pole chamber 24 of hydraulic pressure stand with have the area ratio between the pole chamber 23 great, to the thin coal seam support, 1 MPa's pressure alright make hydraulic support rise usually, thereby can improve hydraulic support's the speed of rising greatly. When descending the frame, because the return stroke does not have the loss of pressure of pipeline, even including the closed oil tank that has certain backpressure, compare in traditional hydraulic support, hydraulic system's total backpressure is also less, can realize descending the frame fast.
Because the closed oil tank can provide a certain flow when the hydraulic upright post is lifted, the main pump station 1 with small rated flow and large rated pressure is only needed to supply liquid to the hydraulic upright post after the top beam 9 is connected with the top until the pressure in the rodless cavity 24 reaches the requirement of initial supporting force.
It should be noted that the power of the pumping station is determined by the flow rate and the pressure. The hydraulic upright column needs to meet the requirements of initial supporting force and rapid movement at the same time when lifting, but the lower cavity of the hydraulic upright column only needs small pressure and large-flow emulsion before the top beam 9 is connected to the top, and needs large pressure and small-flow emulsion after the top is connected.
The closed oil tank has the effects that small pressure and large-flow emulsion are provided for the lower cavity of the hydraulic upright post before the top beam 9 is abutted, and then large pressure and small-flow emulsion are provided by the main pump station after the top beam 9 is abutted, so that the pump station with large rated pressure and large rated flow is not needed, the power required to be provided by the pump station is greatly reduced, the main pump station 1 with small volume can be used satisfactorily, and the main pump station 1 can be easily installed on the hydraulic support, so that 'one pump is realized', and the main contradiction that the pump station is difficult to install on the hydraulic support for distributed liquid supply is solved.
According to the hydraulic system provided by the embodiment of the invention, the required power of the pump station is reduced, the size of the required pump station is further reduced, and the main pump station 1 is convenient to mount on the support.
In some embodiments, main valve body 3 is a three-position, four-way valve having three operating positions, a first position, a second position, and a third position, respectively, main valve body 3 being changeable between the first position, the second position, and the third position.
When the hydraulic upright post is in a first position, the first working oil port is communicated with the oil outlet, the second working oil port is communicated with the oil inlet, and the hydraulic upright post is in a post descending state; when the hydraulic upright post is in a second position, the first working oil port and the second working oil port are both communicated with the oil inlet, and the hydraulic upright post is in a static state; and when the hydraulic column is in a third position, the first working oil port is communicated with the oil inlet, the second working oil port is communicated with the oil outlet, and the hydraulic column is in a column lifting state at the moment.
In some embodiments, the hydraulic columns include a first hydraulic column 21 and a second hydraulic column 22, i.e., two hydraulic columns per hydraulic support, whereby the stability of the top beam 9 can be ensured.
The rod cavity 23 of the first hydraulic upright 21 and the rod cavity 23 of the second hydraulic upright 22 are both communicated with the first working oil port, the rodless cavity 24 of the first hydraulic upright 21 and the rodless cavity 24 of the second hydraulic upright 22 are both communicated with the second working oil port, it can be understood that the first hydraulic upright 21 and the second hydraulic upright 22 are arranged in parallel, and the first hydraulic upright 21 and the second hydraulic upright 22 need to be synchronously lifted or lowered.
Correspondingly, the closed oil tank includes first closed oil tank 41 and second closed oil tank 42, and first closed oil tank 41 and second closed oil tank 42 all communicate with main valve body 3, oil inlet and oil-out, promptly, first closed oil tank 41 and the parallelly connected setting of second closed oil tank 42. It should be noted that, because of the limited space on the hydraulic support, can provide sufficient fluid for two hydraulic pressure stand lift columns in order to guarantee the closed oil tank, consequently set up two miniature closed oil tanks, the installation of being convenient for.
In some embodiments, the hydraulic system further comprises a liquid supplementing pump station 5, the liquid supplementing pump station 5 is respectively communicated with the oil inlet and the oil outlet, and when liquid leakage occurs in the system, the liquid supplementing pump station 5 can supplement liquid for the hydraulic system, so that normal operation of the hydraulic system is guaranteed, and reliability of the hydraulic system is improved.
The hydraulic system further comprises a first hydraulic control one-way valve 61 and a second hydraulic control one-way valve 62, the first hydraulic control one-way valve 61 is arranged on a connecting pipeline of the rodless cavity 24 of the first hydraulic upright post 21 and the second working oil port to prevent backflow of emulsion in the rodless cavity 24 of the first hydraulic upright post 21, the control oil port of the first hydraulic control one-way valve 61 is communicated with the rod cavity 23 of the first hydraulic upright post 21, the second hydraulic control one-way valve 62 is arranged on a connecting pipeline of the rodless cavity 24 of the second hydraulic upright post 22 and the second working oil port to prevent backflow of emulsion in the rodless cavity 24 of the second hydraulic upright post 22, and the control oil port of the second hydraulic control one-way valve 62 is communicated with the rod cavity 23 of the second hydraulic upright post 22.
When the hydraulic upright columns drop, the main valve body 3 is located at the first position, the main pump station 1 supplies liquid to the rod cavities 23 of the two hydraulic upright columns, the first hydraulic control one-way valve 61 and the second hydraulic control one-way valve 62 are opened reversely at the moment, the rodless cavities 24 of the two hydraulic upright columns return liquid, the emulsion flows back to the first closed oil tank 41 and the second closed oil tank 42 through the main valve body 3, the liquid flowing back from the two closed oil tanks is larger than the discharged liquid at the moment, and therefore the point P is in a liquid inlet state. Because the backflow pipeline does not have the backpressure that long distance hydraulic line and produced, in addition can adopt large-traffic liquid return valve, so even closed oil tank has the backpressure about 1MPa, compare in traditional hydraulic support, the post speed that falls of hydraulic pressure stand also can effectual improvement.
After the column descending action is finished, the frame lifting is started, the main valve body 3 is located at the third position, at the moment, the 1MPa pressure stored in the closed oil tank can be quickly released, and the instantaneous large flow is provided for the rodless cavity 24 of the hydraulic upright column, so that the quick column lifting action is finished. At this time, the liquid discharged from the closed tank is larger than the liquid flowing back, so that the liquid is discharged at this time point P. After the top plate is abutted, the main pump station 1 with small flow and large rated pressure is adopted to continuously supply liquid to the rodless cavity 24 until the pressure of the rodless cavity 24 reaches the requirement of initial supporting force. Then the main valve body 3 changes to the neutral position, and the first pilot check valve 61 and the second pilot check valve 62 lock the pressure of the stem-less chamber 24.
In some embodiments, the hydraulic system further comprises a first check valve 63, a second check valve 64, a third check valve 65 and a fourth check valve 66, wherein the first check valve 63 is arranged on the connecting pipeline between the oil outlet and the main valve body 3 to prevent the emulsion from flowing back to the main pump station 1; the second one-way valve 64 is arranged on a connecting pipeline between the liquid supplementing pump station 5 and the oil outlet so as to prevent the emulsion from flowing back to the liquid supplementing pump station 5; the third one-way valve 65 is arranged on a connecting pipeline between the liquid supplementing pump station 5 and the oil inlet so as to prevent the emulsion from flowing back to the liquid supplementing pump station 5; the fourth check valve 66 is arranged on a connecting pipeline between the closed oil tank and the oil outlet of the main pump station 1 so as to enable the emulsion to flow back to the closed oil tank.
The first check valve 63, the second check valve 64, the third check valve 65 and the fourth check valve 66 are all used for ensuring normal and stable operation of the hydraulic system.
Besides, the hydraulic system further includes a first relief valve 71, a second relief valve 72, a first relief valve 73, and a second relief valve 74, the first relief valve 71 is connected to a pipeline between the first pilot check valve 61 and the rod-less chamber 24 of the first hydraulic column 21, and the second relief valve 72 is connected to a pipeline between the second pilot check valve 62 and the rod-less chamber 24 of the second hydraulic column 22. The working resistance of the hydraulic column is set by the first safety valve 71 and the second safety valve 72, and the first safety valve 71 and the second safety valve 72 also play a role in pressure limiting protection, so that the normal operation of a hydraulic system is ensured.
The first overflow valve 73 is connected on the pipeline between the oil outlet of the main pump station 1 and the main valve body 3, and the second overflow valve 74 is connected on the pipeline between the fluid infusion pump station 5 and the main valve body 3. The first overflow valve 73 and the second overflow valve 74 play roles in overflowing and pressure stabilizing, and normal operation of the hydraulic system can be ensured.
The hydraulic system further comprises a first filter 75 and a second filter 76, the first filter 75 is arranged on a pipeline between the P point and the closed oil tank, so that impurities of oil entering the closed oil tank are filtered, the second filter 76 is arranged at an oil inlet of the liquid supplementing pump station 5, so that impurities of the oil entering the liquid supplementing pump station 5 are filtered, the oil is maintained to be clean, and the normal work of the hydraulic system is guaranteed.
According to another aspect of the invention, a hydraulic support comprises the hydraulic system of any one of the above embodiments. As shown in fig. 3, in a 300 meter long coal face, about 200 hydraulic supports each having one main pump station 1 need to be provided.
In addition, as shown in fig. 2, the hydraulic support according to the embodiment of the present invention further includes a base 8, a top beam 9 and an electric displacement cylinder 10, the top beam 9 is used for supporting a top plate, the lower end of the hydraulic column is connected to the base 8, the upper end of the hydraulic column is connected to the top beam 9, the hydraulic column lift column drives the top beam 9 to ascend, the process is a hydraulic support lift process, the hydraulic column descends to drive the top beam 9 to descend, the process is a hydraulic support descending process, the main pump station 1 and the closed oil tanks are both disposed on the upper surface of the base 8, the first closed oil tank 41 is disposed corresponding to the first hydraulic column 21, and the second closed oil tank 42 is disposed corresponding to the second hydraulic column 22.
One end of an electric pushing cylinder 10 is hinged with the base 8, in the frame descending process, the electric pushing cylinder 10 starts to work when the top beam 9 is separated from the top plate, the frame pulling action is carried out synchronously, and before the upright posts are connected with the top during the column lifting, the frame pulling action is finished. The electric cylinder is adopted for the pushing action, the electric cylinder has the advantages of high speed, accurate control and the like, and in addition, because the lifting frame and the pushing use two sets of independent energy supply systems, the partial processes of the pulling action, the lifting frame and the lowering frame are easier to be carried out simultaneously, so that the time required by the whole frame moving process is further shortened. After the column lifting action is completed, the pushing and sliding action is completed by the electric pushing and moving cylinder 10. And the hydraulic support completes a working cycle.
The hydraulic support further comprises a shield beam 11, a first connecting rod 12 and a second connecting rod 13, wherein the shield beam 11 is used for protecting the hydraulic support and preventing the falling waste rock from damaging the hydraulic support. The first end of the shield beam 11 is hinged with one end of the top beam 9, the second end of the shield beam 11 is hinged with the first end of the first connecting rod 12, the second end of the first connecting rod 12 is hinged with one end of the base 8, the first end of the second connecting rod 13 is hinged with the base 8, and the second end of the second connecting rod 13 is hinged with the middle of the shield beam 11. The shield beam 11, the first connecting rod 12, the base 8 and the second connecting rod 13 are sequentially connected to form a four-bar mechanism, and the movement track of the front end of the shield beam 11 can be ensured to be a vertical straight line by optimizing the position of a hinge joint of the four-bar mechanism, so that the influence of the shield beam 11 on the normal lifting of the top beam 9 is avoided.
Further, the hydraulic support further comprises a balance adjusting cylinder 14, one end of the balance adjusting cylinder 14 is hinged to the top beam 9, the other end of the balance adjusting cylinder 14 is hinged to the shield beam 11, the balance adjusting cylinder 14 is used for guaranteeing the horizontal state of the top plate, the balance adjusting cylinder 14 can be an electric cylinder or a hydraulic cylinder, and is preferably an electric cylinder.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. 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.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A hydraulic system, comprising:
the main pump station is provided with an oil inlet and an oil outlet;
the hydraulic upright comprises a rod cavity and a rodless cavity which are communicated with each other;
the oil inlet and the oil outlet are both communicated with the main valve body, the main valve body comprises a first working oil port and a second working oil port, the first working oil port is communicated with the rod cavity, and the second working oil port is communicated with the rodless cavity;
the closed oil tank is communicated with the main valve body, the oil inlet and the oil outlet respectively.
2. The hydraulic system of claim 1, wherein the main valve body is a three-position, four-way valve, the main valve body being changeable between a first position, a second position, and a third position;
at the first position, the first working oil port is communicated with the oil outlet, and the second working oil port is communicated with the oil inlet;
at the second position, the first working oil port and the second working oil port are both communicated with the oil inlet;
and at the third position, the first working oil port is communicated with the oil inlet, and the second working oil port is communicated with the oil outlet.
3. The hydraulic system of claim 1, wherein the hydraulic columns include a first hydraulic column and a second hydraulic column, the rod cavities of the first hydraulic column and the second hydraulic column are both in communication with the first working port, and the rodless cavity of the first hydraulic column and the rodless cavity of the second hydraulic column are both in communication with the second working port.
4. The hydraulic system of claim 1, wherein the closed tanks include a first closed tank and a second closed tank, each of the first closed tank and the second closed tank being in communication with the main valve body, the oil inlet, and the oil outlet.
5. The hydraulic system of claim 1, further comprising a fluid infusion pump station in communication with the oil inlet and the oil outlet, respectively.
6. The hydraulic system of claim 3, further comprising a first hydraulic check valve and a second hydraulic check valve, wherein the first hydraulic check valve is arranged on a connecting pipeline between the rodless cavity of the first hydraulic column and the second working oil port, a control oil port of the first hydraulic check valve is communicated with the rod cavity of the first hydraulic column, the second hydraulic check valve is arranged on a connecting pipeline between the rodless cavity of the second hydraulic column and the second working oil port, and a control oil port of the second hydraulic check valve is communicated with the rod cavity of the second hydraulic column.
7. The hydraulic system according to claim 5, further comprising a first check valve, a second check valve, a third check valve and a fourth check valve, wherein the first check valve is arranged on a connecting pipeline between the oil outlet and the main valve body to prevent the emulsion from flowing back to the main pump station;
the second one-way valve is arranged on a connecting pipeline between the liquid supplementing pump station and the oil outlet so as to prevent the emulsion from flowing back to the liquid supplementing pump station;
the third one-way valve is arranged on a connecting pipeline between the liquid supplementing pump station and the oil inlet so as to prevent the emulsion from flowing back to the liquid supplementing pump station;
and the fourth one-way valve is arranged on a connecting pipeline between the closed oil tank and the oil outlet of the main pump station so as to enable the emulsion to flow back to the closed oil tank.
8. A hydraulic support is characterized by comprising a hydraulic system according to any one of claims 1-6, and further comprising a base, a top beam and an electric pushing cylinder, wherein the lower end of the hydraulic upright is connected with the base, the upper end of the hydraulic upright is connected with the top beam, a main pump station and a closed oil tank are both arranged on the upper surface of the base, and one end of the electric pushing cylinder is hinged with the base.
9. The hydraulic support of claim 8, further comprising a shield beam, a first link and a second link, wherein a first end of the shield beam is hinged to one end of the top beam, a second end of the shield beam is hinged to a first end of the first link, a second end of the first link is hinged to one end of the base, a first end of the second link is hinged to the base, and a second end of the second link is hinged to a middle portion of the shield beam.
10. The hydraulic support according to claim 9, further comprising a balance cylinder, one end of the balance cylinder being hinged to the roof beam and the other end of the balance cylinder being hinged to the shield beam.
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| CN113586107A (en) * | 2021-09-06 | 2021-11-02 | 山西银锋科技有限公司 | Power generation system utilizing mine pressure |
| CN114857491A (en) * | 2022-04-12 | 2022-08-05 | 中铁工程装备集团有限公司 | Heading machine and propulsion control system thereof |
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