CN212377004U - Automatic electro-hydraulic unloading valve - Google Patents
Automatic electro-hydraulic unloading valve Download PDFInfo
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- CN212377004U CN212377004U CN202021120410.7U CN202021120410U CN212377004U CN 212377004 U CN212377004 U CN 212377004U CN 202021120410 U CN202021120410 U CN 202021120410U CN 212377004 U CN212377004 U CN 212377004U
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Abstract
The utility model provides an automatic electricity liquid uninstallation valve, including the valve body to and from last to setting gradually down in the valve body uninstallation return liquid passageway, pump flowing back passageway and high-pressure feed liquid passageway, uninstallation return liquid passageway and pump flowing back passageway between be equipped with the main valve, be equipped with first check valve between high-pressure feed liquid passageway and the pump flowing back passageway, first check valve includes: the first one-way valve seat is provided with a first one-way valve cavity; the first guide sleeve is arranged in the first one-way valve seat and is provided with a plurality of first through holes for communicating the first one-way valve cavity with the high-pressure liquid supply channel; the first one-way valve core is arranged in the first guide sleeve in a vertically movable manner; one end of the first spring is abutted against the first one-way valve core, and the other end of the first spring is abutted against the first guide sleeve. Therefore, when the first one-way valve core is opened under the action of hydraulic pressure, high-pressure liquid can be discharged to the high-pressure liquid supply channel along the first through hole, so that back pressure cannot be formed on the back surface of the first one-way valve core, the first one-way valve core is opened smoothly, and the liquid supply speed is high.
Description
Technical Field
The utility model relates to an uninstallation valve technical field, concretely relates to automatic electricity liquid uninstallation valve.
Background
The hydraulic system of the fully mechanized coal mining face is important equipment in underground production of a coal mine, and comprises a hydraulic support system and a liquid supply system, wherein the hydraulic support is used for cutting coal and moving along with a coal cutter in time so as to ensure that a working face top plate supports a coal bed and normally advances; the liquid supply system provides power for the hydraulic support system and mainly comprises an emulsion pump, a liquid tank and an unloading valve arranged at a liquid discharge port of the emulsion pump.
The unloading valve is internally provided with a high-pressure liquid supply channel and an unloading liquid return channel which are communicated with a liquid outlet of the emulsion pump, and the opening and closing states of the high-pressure liquid supply channel and the unloading liquid return channel are opposite; when the unloading valve is in a loading state, the unloading liquid return pipeline is closed, the high-pressure liquid supply pipeline is opened, the emulsion pump sucks liquid from the liquid tank through the liquid suction pipe, and the liquid is input into the hydraulic support system from the high-pressure liquid supply port of the unloading valve so as to provide power for the hydraulic support; when the hydraulic support does not act, the emulsion pump continuously keeps a liquid supply state, the pressure of a hydraulic support system can rise, when the pressure exceeds a preset value, the high-pressure liquid supply channel of the unloading valve is closed, the unloading liquid return channel is opened, the unloading valve is in an unloading state, and high-pressure liquid output by the emulsion pump flows back to the liquid tank through the unloading liquid return pipeline.
The unloading valve is internally provided with a first one-way valve for controlling the connection or disconnection state of the pump liquid drainage channel 05 and the high-pressure liquid supply channel 06, as shown in fig. 8, the first one-way valve comprises a first one-way valve seat 01, a one-way valve cavity 02, a guide sleeve 03 and a first one-way valve core 04 which can be vertically installed on the guide sleeve 03, the first one-way valve core 04 is T-shaped, the T-shaped first one-way valve core 04 comprises a first valve core part 041 which is vertically arranged and a second valve core part 042 which is transversely arranged and is arranged at the top of the first valve core part 041, and the second valve core part 042 can be used for sealing the connection of the pump liquid drainage channel 05 and the high-pressure. When the valve is in a loading state, the first check valve core 04 is jacked open by high-pressure liquid to move downwards, the high-pressure liquid flows into the check valve cavity 02 rapidly and fills the check valve cavity 02, and thus the liquid in the check valve cavity 02 exerts high hydraulic pressure (commonly called back pressure) on the back surface of the second valve core part 042, so that the first check valve core 04 is opened unsmoothly, and the liquid supply speed is low.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the first one-way valve core of the uninstallation valve among the prior art and opening not smooth and easy when the loading state, lead to the slower defect of liquid supply speed to provide one kind and open smooth and easy, the fast automatic electricity liquid uninstallation valve of liquid supply speed.
For this, the utility model provides an automatic electricity liquid uninstallation valve, including the valve body to and from last set gradually down in uninstallation in the valve body returns liquid passageway, pump flowing back passageway and high-pressure liquid supply channel, the uninstallation return liquid passageway with be equipped with the main valve between the pump flowing back passageway, be equipped with first check valve between high-pressure liquid supply channel and the pump flowing back passageway, first check valve includes: the first one-way valve seat is provided with a first one-way valve cavity; the first guide sleeve is arranged in the first one-way valve seat and is provided with a plurality of first through holes for communicating the first one-way valve cavity with the high-pressure liquid supply channel; the first check valve core is arranged in the first guide sleeve in a vertically movable manner; and one end of the first spring is abutted against the first one-way valve core, and the other end of the first spring is abutted against the first guide sleeve.
And an elastic check ring is arranged between the bottom of the first guide sleeve and the first one-way valve seat.
Still be equipped with in the valve body: the first control liquid path is communicated with the high-pressure liquid supply channel; the first unloading liquid path is communicated with the unloading liquid return channel; the pressure maintaining control liquid path is communicated with the upper chamber of the main valve core of the main valve and the pump liquid drainage channel; the pilot valve is arranged in a pilot chamber which can be communicated with the first control liquid path, the first unloading liquid path and the pressure maintaining control liquid path, and is provided with a pilot valve core which can control the communication or the closing of the pressure maintaining control liquid path and the first unloading liquid path; when the hydraulic pressure of the high-pressure liquid supply channel is greater than a set value, the pilot valve core is opened under the action of the hydraulic pressure of the first control liquid path, so that the pressure maintaining control liquid path is communicated with the first unloading liquid path.
The pilot valve comprises a pilot plug, a second guide sleeve, a pilot valve seat, a pilot valve core and a pressure regulating assembly which are sequentially arranged from left to right, a push rod which can be abutted against the pilot valve core is slidably mounted in the second guide sleeve, the pilot plug and the second guide sleeve are enclosed to form a first cavity communicated with the first control liquid path, and the second guide sleeve and the pilot valve seat are enclosed to form a second cavity communicated with the pressure maintaining control liquid path.
The second unloading liquid path is communicated with the unloading liquid return channel; the second control liquid path is communicated with the pressure maintaining control liquid path; and the electromagnetic valve is suitable for controlling the communication or the closing of the second control liquid path and the second unloading liquid path, wherein when the hydraulic pressure of the high-pressure liquid supply channel is greater than a set value, the electromagnetic valve controls the communication of the second control liquid path and the second unloading liquid path.
And a pilot filter is arranged between the pressure maintaining control liquid path and the electromagnetic valve.
Still including locating the uninstallation damping assembly of uninstallation return liquid mouth department of uninstallation return liquid passageway, uninstallation damping assembly includes: the second one-way valve is communicated with the unloading liquid return pipeline, and when the air pressure of the unloading liquid return pipeline is smaller than a set value, the second one-way valve is opened to increase the air pressure value of the unloading liquid return pipeline; and the air filter is arranged on the second one-way valve.
The second check valve includes: the second one-way valve seat is provided with a second one-way valve cavity; the second guide sleeve is arranged in the second one-way valve seat and is provided with a second through hole for communicating the second one-way valve cavity with the unloading return pipeline; the second one-way valve core is arranged in the second one-way valve seat in a manner of moving up and down; and one end of the second spring is abutted against the second one-way valve core, and the other end of the second spring is abutted against the second guide sleeve.
The utility model discloses technical scheme has following advantage:
1. the utility model provides an automatic electricity liquid uninstallation valve, first uide bushing have the first perforation of the first check valve pocket of a plurality of intercommunications and high pressure feed liquid passageway, like this when first check valve core opens under hydraulic pressure force effect, high-pressure liquid can discharge to high pressure feed liquid passageway along first perforation to can not form the backpressure at the first check valve core back, make first check valve core open smoothly, the feed liquid velocity is very fast.
2. The utility model provides an automatic electricity liquid uninstallation valve is equipped with circlip between the bottom of first uide bushing and the first one-way disk seat, and circlip is used for injecing the mounted position of first uide bushing, and in addition, circlip can play certain cushioning effect when first uide bushing receives high hydraulic pressure effect, has prolonged the life of first uide bushing.
3. The utility model provides an automatic electricity liquid uninstallation valve, including pilot valve and solenoid valve, when the pilot valve breaks down, the solenoid valve can play the effect of uninstallation, and the security performance is higher like this.
4. The utility model provides an automatic electricity liquid uninstallation valve, uninstallation damper assembly includes: the second one-way valve is communicated with the unloading liquid return pipeline, and when the air pressure of the unloading liquid return pipeline is smaller than a set value, the second one-way valve is opened to increase the air pressure value of the unloading liquid return pipeline; and the air filter is arranged on the second one-way valve. The inventor finds that the unloading liquid return pipeline is easy to form vacuum when being close to the unloading liquid return port during unloading, the internal and external pressure difference causes the unloading liquid return pipeline to vibrate, and air is supplemented when the air pressure of the unloading liquid return pipeline is reduced by arranging the second one-way valve and the air filter, so that the internal and external pressures are balanced, and the vibration of the liquid return pipeline is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the automatic electro-hydraulic unloading valve of the present invention in a mechanical loading state or an electromagnetic loading state;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is an enlarged schematic view of portion B of FIG. 1;
FIG. 4 is a schematic structural diagram of the automatic electro-hydraulic unloading valve in a mechanical unloading state;
FIG. 5 is an enlarged schematic view of portion C of FIG. 4;
FIG. 6 is a schematic structural diagram of the automatic electro-hydraulic unloading valve in an electromagnetic unloading state;
FIG. 7 is a schematic view of the structure of the unloader damping assembly mounted on the unloader return line;
fig. 8 is a schematic view of a first check valve of the unloading valve in the prior art.
Description of reference numerals: 01. a first one-way valve seat; 02. a one-way valve cavity; 03. a guide sleeve; 04. a first one-way valve element; 041. a first valve core part; 042. a second valve core portion; 05. a pump drainage channel; 06. a high pressure liquid supply channel;
1. a valve body; 11. unloading the liquid return channel; 12. a pump drainage channel; 13. a high pressure liquid supply channel; 14. a first control fluid path; 15. a first unloading liquid path; 16. pressure maintaining control of the liquid path; 17. a second unloading liquid path; 18. a second control fluid path; 19. unloading the liquid return port; 2. a main valve; 21. a main valve element; 22. an upper chamber; 3. a first check valve; 31. a first one-way valve seat; 32. a first one-way valve cavity; 33. a first guide sleeve; 34. a first perforation; 35. a first one-way valve element; 36. a first spring; 37. a circlip; 4. a pilot valve; 41. a pilot plug; 42. a second guide sleeve; 43. a pilot valve seat; 44. a pilot valve spool; 45. a voltage regulating component; 46. a top rod; 47. a first chamber; 48. a second chamber; 5. an electromagnetic valve; 6. a second one-way valve; 61. a second one-way valve seat; 62. a second guide sleeve; 63. a second perforation; 64. a second one-way valve element; 65. a second spring; 7. an air cleaner; 8. a pilot filter; 9. and unloading the liquid return pipeline.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Examples
The embodiment provides an automatic electro-hydraulic unloading valve, as shown in fig. 1, comprising a valve body 1, a main valve 2, a first check valve 3, a pilot valve 4, an electromagnetic valve 5 and an unloading damping assembly.
The valve body 1 is provided with an unloading liquid return channel 11, a pump liquid discharge channel 12 and a high-pressure liquid supply channel 13 from top to bottom in sequence, a first control liquid path 14 communicated with the high-pressure liquid supply channel 13, a first unloading liquid path 15 and a second unloading liquid path 17 communicated with the unloading liquid return channel 11 respectively are further arranged on the valve body 1, an upper chamber 22 of a main valve core 21 of the main valve 2 is communicated with a pressure maintaining control liquid path 16 of the pump liquid discharge channel 12, and a second control liquid path 18 is communicated with the pressure maintaining control liquid path 16.
The two main valves 2 are arranged between the unloading liquid return channel 11 and the pump liquid discharge channel 12 and are used for controlling the opening or closing of the unloading liquid return channel 11 and the pump liquid discharge channel 12.
Two first check valves 3 are provided between the high-pressure liquid supply passage 13 and the pump discharge passage 12, as shown in fig. 2, and the first check valves 3 include: a first check valve seat 31 having a first check valve chamber 32; a first guide sleeve 33 arranged in the first one-way valve seat 31 and provided with a plurality of first through holes 34 communicating the first one-way valve cavity 32 with the high-pressure liquid supply passage 13; a first check valve body 35 installed in the first guide sleeve 33 to be movable up and down; and a first spring 36 having one end abutting against the first check valve body 35 and the other end abutting against the first guide sleeve 33. A circlip 37 is arranged between the bottom of the first guide sleeve 33 and the first one-way valve seat 31.
A pilot valve 4 provided in a pilot chamber that can communicate with the first control fluid passage 14, the first unloading fluid passage 15, and the pressure maintaining control fluid passage 16, the pilot valve 4 having a pilot valve core 44 that can control communication or closing of the pressure maintaining control fluid passage 16 and the first unloading fluid passage 15; when the hydraulic pressure of the high-pressure liquid supply channel 13 is greater than a set value, the pilot valve spool 44 is opened under the hydraulic pressure of the first control liquid path 14, so that the pressure maintaining control liquid path 16 is communicated with the first unloading liquid path 15. As shown in fig. 3 to 5, the pilot valve 4 includes a pilot plug 41, a second guide sleeve 42, a pilot valve seat 43, the pilot valve core 44, and a pressure regulating assembly 45, which are sequentially arranged from left to right, a push rod 46 that can abut against the pilot valve core 44 is slidably installed in the second guide sleeve 42, a first chamber 47 that is communicated with the first control fluid path 14 is enclosed between the pilot plug 41 and the second guide sleeve 42, and a second chamber 48 that is communicated with the pressure maintaining control fluid path 16 is enclosed between the second guide sleeve 42 and the pilot valve seat 43. A pilot filter 8 is arranged between the pressure maintaining control liquid path 16 and the electromagnetic valve 5.
The solenoid valve 5, as shown in fig. 6, is adapted to control the communication or closing of the second control fluid path 18 and the second unloading fluid path 17, wherein when the hydraulic pressure of the high-pressure liquid supply channel 13 is greater than a set value, the solenoid valve 5 controls the communication of the second control fluid path 18 and the second unloading fluid path 17. It should be noted that the solenoid valve is a mature technology in the prior art, and therefore, the internal structure and the working principle thereof are not described in detail.
The unloading shock-absorbing assembly is arranged at the unloading liquid return port 19 of the unloading liquid return channel 11, as shown in fig. 7, and comprises: the second one-way valve 6 is communicated with the unloading liquid return pipeline 9, wherein when the air pressure of the unloading liquid return pipeline 9 is smaller than a set value, the second one-way valve 6 is opened to increase the air pressure value of the unloading liquid return pipeline 9; and an air cleaner 7 provided on the second check valve 6. The second check valve 6 includes: a second one-way valve seat 61 having a second one-way valve cavity; the second guide sleeve 62 is arranged in the second one-way valve seat 61 and is provided with a second through hole 63 for communicating the second one-way valve cavity with the unloading return pipeline 9; a second check valve body 64 provided in the second check valve seat 61 so as to be movable up and down; and a second spring 65 having one end abutting against the second check valve member 64 and the other end abutting against the second guide sleeve 62.
The utility model discloses an automatic electric liquid uninstallation valve's theory of operation as follows:
1) mechanical (pilot) loading and unloading states
When in the loaded state, as shown in fig. 1-3, the liquid in the pump discharge passage 12 flows into the upper chamber 22 of the main valve element 21 through the pressure maintaining control liquid passage 16, so that the main valve element 21 is in the closed state, and at the same time, the first check valve element 35 moves downward under the hydraulic pressure, so that the pump discharge passage 12 and the high-pressure liquid supply passage 13 are communicated, thereby supplying liquid to the hydraulic support; when the hydraulic pressure of the hydraulic support line is greater than the set value, the fluid flowing into the first chamber 47 of the pilot valve 4 through the first control fluid path 14 drives the pilot valve spool 44 to move rightward (in the open state shown in fig. 4 and 5), so that the pressure maintaining control fluid path 16 is communicated with the first unloading fluid path 15, the fluid in the upper chamber 22 of the main valve spool 21 flows into the unloading return fluid channel 11 through the pressure maintaining control fluid path 16 and the first unloading fluid path 15 in sequence, because the hydraulic pressure of the upper chamber 22 is smaller than the hydraulic pressure of the pump drainage channel 12, the main valve spool 21 moves upward (in the open state), so that the hydraulic drainage channel 12 is communicated with the unloading return fluid channel 11, the fluid is discharged through the unloading return fluid line 9, and at the same time, the first check valve spool 35 moves upward (in the closed state).
2) Electromagnetic (solenoid) load and unload states
When the pilot valve 4 fails, the solenoid valve 5 can control the loading and unloading states. When in the loading state, the electromagnetic valve 5 is in the power-on state, controls the second unloading liquid path 17 to be disconnected from the second control liquid path 18, and has the same mechanical loading mode, the main valve element 21 is in the closing state, and the first one-way valve element 35 is in the opening state; as shown in fig. 6, when the hydraulic pressure of the hydraulic support line is greater than the set value, the sensor will transmit the hydraulic parameter to the control system, the control system controls the solenoid valve 5 to be de-energized, so that the second unloading liquid path 17 is communicated with the second control liquid path 18, the liquid in the upper chamber 22 of the main valve element 21 flows into the unloading liquid return channel 11 through the pressure maintaining control liquid path 16 and the second unloading liquid path 17 in sequence, since the hydraulic pressure of the upper chamber 22 is smaller than the pump liquid discharge channel 12, the main valve element 21 moves upward (open state), so that the pump liquid discharge channel 12 is communicated with the unloading liquid return channel 11, the liquid is discharged through the unloading liquid return line 9, and at the same time, the first check valve element 35 moves upward (closed state).
The utility model provides an automatic electricity liquid uninstallation valve, first uide bushing 33 have the first perforation 34 of the first check valve chamber 32 of a plurality of intercommunications and high pressure feed liquid passageway 13, like this when first check valve core 35 is opened under the hydraulic pressure effect, high-pressure liquid can be along first perforation 34 discharge to high pressure feed liquid passageway 13 to can not form the backpressure at the 35 back of first check valve core, make first check valve core 35 open smoothly, the feed liquid speed is very fast.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (8)
1. The utility model provides an automatic electricity liquid unloading valve, includes valve body (1) to and from last to set gradually down in uninstallation in valve body (1) returns liquid passageway (11), pump drainage channel (12) and high-pressure liquid supply channel (13), uninstallation return liquid passageway (11) with be equipped with main valve (2) between pump drainage channel (12), be equipped with first check valve (3) between high-pressure liquid supply channel (13) and pump drainage channel (12), its characterized in that, first check valve (3) include:
a first one-way valve seat (31) having a first one-way valve cavity (32);
the first guide sleeve (33) is arranged in the first one-way valve seat (31) and is provided with a plurality of first through holes (34) communicated with the first one-way valve cavity (32) and the high-pressure liquid supply passage (13);
a first check valve core (35) which is installed in the first guide sleeve (33) in a manner of moving up and down;
and one end of the first spring (36) is abutted against the first one-way valve core (35), and the other end of the first spring is abutted against the first guide sleeve (33).
2. The automatic electro-hydraulic unloading valve according to claim 1, characterized in that a circlip (37) is provided between the bottom of the first guide sleeve (33) and the first one-way valve seat (31).
3. The automatic electro-hydraulic unloading valve according to claim 1 or 2, characterized in that inside the valve body (1) there are further provided:
a first control liquid path (14) communicated with the high-pressure liquid supply channel (13);
a first unloading liquid path (15) communicated with the unloading liquid return channel (11);
a pressure maintaining control liquid path (16) for communicating an upper chamber (22) of a main valve core (21) of the main valve (2) with the pump drainage passage (12);
a pilot valve (4) provided in a pilot chamber that can communicate with the first control fluid path (14), the first unloading fluid path (15), and the pressure-maintaining control fluid path (16), the pilot valve (4) having a pilot valve element (44) that can control communication or closing of the pressure-maintaining control fluid path (16) and the first unloading fluid path (15); when the hydraulic pressure of the high-pressure liquid supply channel (13) is larger than a set value, the pilot valve core (44) is opened under the action of the hydraulic pressure of the first control liquid path (14) so as to communicate the pressure maintaining control liquid path (16) with the first unloading liquid path (15).
4. The automatic electrohydraulic unloading valve according to claim 3, wherein the pilot valve (4) comprises a pilot plug (41), a second guide sleeve (42), a pilot valve seat (43), the pilot valve core (44) and a pressure regulating assembly (45) which are arranged from left to right in sequence, a push rod (46) which can abut against the pilot valve core (44) is slidably mounted in the second guide sleeve (42), a first chamber (47) communicated with the first control liquid path (14) is formed by enclosing between the pilot plug (41) and the second guide sleeve (42), and a second chamber (48) communicated with the pressure maintaining control liquid path (16) is formed by enclosing between the second guide sleeve (42) and the pilot valve seat (43).
5. The automatic electro-hydraulic unloader valve of claim 4, further comprising:
a second unloading liquid path (17) communicated with the unloading liquid return channel (11);
a second control fluid path (18) that communicates with the pressure-maintaining control fluid path (16);
and the electromagnetic valve (5) is suitable for controlling the second control liquid path (18) and the second unloading liquid path (17) to be communicated or closed, wherein when the hydraulic pressure of the high-pressure liquid supply channel (13) is greater than a set value, the electromagnetic valve (5) controls the second control liquid path (18) and the second unloading liquid path (17) to be communicated.
6. The automatic electro-hydraulic unloader valve according to claim 5, wherein a pilot filter (8) is provided between the pressure holding control hydraulic circuit (16) and the solenoid valve (5).
7. The automatic electro-hydraulic unloader valve of any one of claims 1, 2, 4, 5, and 6, further comprising an unloader damper assembly provided at an unloader return port (19) of the unloader return channel (11), the unloader damper assembly comprising:
the second one-way valve (6) is communicated with the unloading liquid return pipeline (9), and when the air pressure of the unloading liquid return pipeline (9) is smaller than a set value, the second one-way valve (6) is opened to increase the air pressure value of the unloading liquid return pipeline;
and the air filter (7) is arranged on the second one-way valve (6).
8. The automatic electro-hydraulic unloading valve according to claim 7, characterized in that the second non-return valve (6) comprises:
a second one-way valve seat (61) having a second one-way valve cavity;
the second guide sleeve (62) is arranged in the second one-way valve seat (61) and is provided with a second through hole (63) for communicating the second one-way valve cavity with the unloading return pipeline (9);
a second check valve body (64) which is provided in the second check valve seat (61) so as to be movable up and down;
and one end of the second spring (65) is abutted against the second one-way valve core (64), and the other end of the second spring is abutted against the second guide sleeve (62).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021120410.7U CN212377004U (en) | 2020-06-16 | 2020-06-16 | Automatic electro-hydraulic unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021120410.7U CN212377004U (en) | 2020-06-16 | 2020-06-16 | Automatic electro-hydraulic unloading valve |
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| Publication Number | Publication Date |
|---|---|
| CN212377004U true CN212377004U (en) | 2021-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202021120410.7U Active CN212377004U (en) | 2020-06-16 | 2020-06-16 | Automatic electro-hydraulic unloading valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087249A (en) * | 2021-11-18 | 2022-02-25 | 国能神东煤炭集团有限责任公司 | Electro-hydraulic pressure control system and control method |
| CN117570077A (en) * | 2024-01-16 | 2024-02-20 | 无锡煤矿机械股份有限公司 | Unloading valve |
-
2020
- 2020-06-16 CN CN202021120410.7U patent/CN212377004U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087249A (en) * | 2021-11-18 | 2022-02-25 | 国能神东煤炭集团有限责任公司 | Electro-hydraulic pressure control system and control method |
| CN114087249B (en) * | 2021-11-18 | 2023-05-26 | 国能神东煤炭集团有限责任公司 | Electrohydraulic pressure control system and control method |
| CN117570077A (en) * | 2024-01-16 | 2024-02-20 | 无锡煤矿机械股份有限公司 | Unloading valve |
| CN117570077B (en) * | 2024-01-16 | 2024-03-19 | 无锡煤矿机械股份有限公司 | Unloading valve |
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