SE2350324A1 - Reversing valve for hydraulic rock drill - Google Patents
Reversing valve for hydraulic rock drillInfo
- Publication number
- SE2350324A1 SE2350324A1 SE2350324A SE2350324A SE2350324A1 SE 2350324 A1 SE2350324 A1 SE 2350324A1 SE 2350324 A SE2350324 A SE 2350324A SE 2350324 A SE2350324 A SE 2350324A SE 2350324 A1 SE2350324 A1 SE 2350324A1
- Authority
- SE
- Sweden
- Prior art keywords
- chamber
- oil
- valve
- valve core
- communication
- Prior art date
Links
- 239000011435 rock Substances 0.000 title claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 42
- 238000005192 partition Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 130
- 239000010729 system oil Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 239000010720 hydraulic oil Substances 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B1/00—Percussion drilling
- E21B1/02—Surface drives for drop hammers or percussion drilling, e.g. with a cable
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
Provided is a reversing valve (5) for a hydraulic rock drill. The reversing valve (5) includes a valve body (53) and a valve core (52). A control chamber (S), a high-pressure oil supply chamber (P), an outlet chamber (A), an oil return chamber (T), and a balance chamber (C) are disposed in sequence between the valve body (53) and the valve core (52), and the control chamber (S) is disposed at one end of the valve core (52), and the balance chamber (C) is disposed at the other end of the valve core (52); only one partition (521) is disposed on the valve core (52), and the partition (521) is disposed between the high-pressure oil supply chamber (P) and the oil return chamber (T); in a process that the partition (521) moves to the right along with the valve core (52), the oil return chamber (T) is gradually partitioned from the outlet chamber (A), and the outlet chamber (A) is gradually in communication with the high-pressure oil supply chamber (P); and in a process that the partition (521) moves to the left along with the valve core (52), the oil return chamber (T) is gradually in communication with the outlet chamber (A), and the outlet chamber (A) is gradually partitioned from the high-pressure oil supply chamber (P). The present invention can reduce lengths and weights of the valve body (53) and the valve core (52), leakage of the reversing valve (5), and machining difficulty of the reversing valve (5).
Description
REVERSING VALVE FOR HYDRAULIC ROCK DRILL Field of the Invention The present invention relates to a reversing valve for a hydraulic rock drill.
Background of the Invention As shown in FIG. l, multiple partitions B on a valve core E of a reversing valve for a conventional hydraulic rock drill separate a control chamber S, a balance Chamber C, a first oil retum chamber D, an outlet chamber A, a high-pressure oil supply chamber P, and a second oil retum chamber G, causing the following problems: l) Due to limitations of the multiple partitions B, the valve core E is heavy and long, finally causing a slow reversing speed of the reversing valve. In addition, when the reversing valve operates, a plurality of chambers among the high-pressure oil supply chamber P, the first oil retum chamber D, the second oil retum chamber G, the outlet chamber A, the control chamber S, and the balance chamber C operate correspondingly, and other oil passages are, in fact, in communication between different chambers, so besides oil work, oil also flows intemally. In addition, a flow speed of the intemal oil is related to a reversing speed of the valve core. When working, the intemal oil flows at a very high speed, which further increases reversing resistance of the valve core E and reduces the reversing speed of the valve core E. 2) In the presence of multiple partition surfaces, there are many opportunities for hydraulic oil to leak from one chamber to another when working, so that intemal leakage of the hydraulic oil is excessive. 3) Design of the multiple partition surfaces and mating surfaces at two ends multiplies machining workload of the reversing valve, increases manufacturing costs of the valve body F and the valve core E, causes difficult machining of the reversing valve, and requires high coaxiality between the valve body F and the valve core E. 4) In a process of using the reversing valve, the partitions B and the mating surfaces wear inevitably, which shortens service life of the reversing valve.
) Because the structure of the conventional reversing valve is very complex, subject to 1 limitations on a size and Weight, the partitions and the mating surfaces at two ends are narrowed as much as possible, which further increases the internal leakage of the hydraulic oil and reduces energy efficiency of the hydraulic oil.
Summary of the Invention For the def1ciency of large intemal leakage of hydraulic oil in the presence of many partitions and mating surfaces in a reversing valve for an existing hydraulic rock drill, the technical problem to be solved by the present invention is to provide a reversing valve for a hydraulic rock drill, which can reduce intemal leakage and simplify intemal structure. To solve the foregoing technical problem, the present invention provides a reversing valve for a hydraulic rock drill. The reversing valve includes a valve body and a valve core. A control chamber, a high-pressure oil supply chamber, an outlet chamber, an oil retum chamber, and a balance chamber are disposed in sequence between the valve body and the valve core. The control chamber is disposed at one end of the valve core, and the balance chamber is disposed at the other end of the valve core. Only one partition is disposed on the valve core, and the partition is disposed between the high-pressure oil supply chamber and the oil retum chamber. In a process that the partition moves to the right along with the valve core, the oil retum chamber is gradually partitioned from the outlet chamber, and the outlet chamber is gradually in communication with the high- pressure oil supply chamber. In a process that the partition moves to the left along with the valve core, the oil retum chamber is gradually in communication with the outlet chamber, and the outlet chamber is gradually partitioned from the high-pressure oil supply chamber.
Only a control chamber, a high-pressure oil supply chamber, an outlet chamber, an oil retum chamber, and a balance chamber are disposed between the valve body and the valve core, instead of setting the balance chamber of the reversing valve for the conventional hydraulic rock drill separately, the second oil retum chamber of the reversing valve for the conventional hydraulic rock drill is used as the balance chamber, so that only one partition can be disposed on the valve core, and when moving to different positions along with the valve body, the partition separates or connects the outlet chamber with the high- 2 pressure oil supply Chamber and the oil return Chamber respectively, thereby realizing reversing of an impact piston.
Preferably, the balance chamber is in communication With the high-pressure oil supply chamber, to avoid forrning an oil inlet of the balance chamber on the valve body, thereby simplifying the structure of the valve body and facilitating layout of other structures on the valve body.
Preferably, an oil inlet in communication With the high-pressure oil supply chamber, an oil outlet in communication With the outlet chamber, and an oil retum inlet in communication With the oil retum chamber are disposed on the valve body.
Preferably, the oil inlet and a piston front chamber of an impact cylinder are connected in parallel to a system oil supply port, the oil outlet is in communication With a piston rear chamber of the impact cylinder, and the oil retum inlet is in communication With a piston middle chamber of the impact cylinder.
Preferably, a valve sleeve is disposed on the periphery of the valve body, and a feedback oil passage in communication With the control chamber is disposed on the valve body and the valve sleeve.
Compared With the prior art, the benef1cial effects of the present invention are as follows: l. By reducing the number of intemal chambers, lengths and Weights of the valve body and the valve core can be reduced, and a reversing speed of the reversing valve can be increased. 2. By reducing the number of partitions on the valve core, intemal leakage of the reversing valve is reduced, and energy efficiency of hydraulic pressure is improved. 3. By reducing quantities of intemal chambers and partitions, machining difficulty of the reversing valve is reduced, and manufacturing costs are loWered. 4. By reducing the number of partitions on the valve core, Wear opportunities of partitions are reduced, thereby prolonging service lives and maintenance periods of the valve body and the valve core, and improving product quality.
Brief Description of the Drawings In order to describe the technical solutions in the embodiments of the present invention 3 or in the prior art more clearly, the following briefly introduces the accompanying drawings required in the description of the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these drawings without any creative effort.
FIG. 1 is a structural schematic diagram of a reversing valve for a conventional hydraulic rock drill.
FIG. 2 is a schematic diagram of a multi-signal oil port structure of the reversing valve for the conventional hydraulic rock drill.
FIG. 3 is a structural schematic diagram of a first embodiment of a signal oil output structure of an impact cylinder of a hydraulic rock drill in the present invention.
FIG. 4 is a structural schematic diagram when a valve core of a reversing valve for a hydraulic rock drill in the present invention is at a left position.
FIG. 5 is a structural schematic diagram when the valve core of the reversing valve for the hydraulic rock drill in the present invention is at a right position.
FIG. 6 is a schematic diagram of flow distribution control of the reversing valve for the hydraulic rock drill in the present invention.
FIG. 7 is a structural schematic diagram of a second embodiment of a signal oil output structure of an impact cylinder of a hydraulic rock drill in the present invention.
FIG. 8 is a structural schematic diagram of a third embodiment of a signal oil output structure of an impact cylinder of a hydraulic rock drill in the present invention.
In the figures: 1. Retum reversing signal oil port; 2. Stroke reversing signal oil port; 3. Impact piston; 4. Impact cylinder body; 5. Reversing valve; 6. Feedback oil passage; 7. Piston front chamber; 8. Piston middle chamber; 9. Piston rear chamber; 31. First annular boss; 32. Second annular boss; 41. Signal oil port; 42. First groove; 51. Valve sleeve; 52. Valve core; 53. Valve body; 311. Second groove; 312. Third groove; 511. Oil inlet; 512. Oil outlet; 513. Oil retum inlet; 521. Partition; A. Outlet chamber; B. Partition; C. Balance chamber; D. First oil retum chamber; E. Valve core; F. Valve body; G. Second oil retum chamber; P. High-pressure oil supply chamber; T. Oil retum chamber; S. Control chamber; Sc. Retum control travel; Sic. Stroke control travel. 4 Detailed Description of the Embodiments The present invention will be further described below with reference to specific preferred embodiments, but the scope of protection of the present invention is not limited thereby. For the convenience of description, relative positional relationships of components, such as upper, lower, left, and right, are described according to layout directions of the drawings in the specification, and do not limit the structure of this patent.
As shown in FIG. 3, a first embodiment of a signal oil output structure of an impact cylinder of a hydraulic rock drill in the present invention includes an impact cylinder and a reversing valve 5, and the impact cylinder includes an impact cylinder body 4 and an impact piston 3.
One end of the impact piston 3 is mounted in the impact cylinder body 4. A first annular boss 3l and a second annular boss 32 which are matched with an inner chamber of the impact cylinder body 4 are disposed on the impact piston 3, and a piston front chamber 7, a piston middle chamber 8, and a piston rear chamber 9 are formed accordingly between the impact piston 3 and the impact cylinder body 4. An hydraulic effective action area of the piston rear chamber on the impact piston 3 is larger than that of the piston front chamber.
Only one signal oil port 4l is disposed on the impact cylinder body 4, and the signal oil port 4l is in communication with a control chamber S of the reversing valve 5 via a pipeline. When the impact piston 3 retums, after the impact piston 3 completes a retum control travel Sc before a left side of the signal oil port 4l, the signal oil port 4l is in communication with the piston front chamber 7. When the impact piston 3 strokes, after the impact piston 3 completes a stroke control travel Sic from a right side of the signal oil port 4l, the signal oil port 4l is in communication with the piston middle chamber 8.
As shown in FIG. 4 and FIG. 5, the reversing valve 5 includes a valve sleeve 5l, a valve core 52, and a valve body 53. A control chamber S, a high-pressure oil supply chamber P, an outlet chamber A, an oil retum chamber T, and a balance chamber C are disposed in sequence between the valve body 53 and the valve core 52. The control chamber S is disposed at one end of the valve core 52, the balance chamber C is disposed at the other end of the Valve core 52, and the balance Chamber C is in communication With the high- pressure oil supply chamber P.
An oil inlet 511 in communication With the high-pressure oil supply chamber P, an oil outlet 512 in communication With the outlet chamber A, and an oil retum inlet 513 in communication With the oil retum chamber T are disposed on the valve body 53. The oil inlet 511 and the piston front chamber 7 are connected With a system oil supply port, the oil outlet 512 is in communication With the piston rear chamber 9, and the oil retum inlet 513 is in communication With the piston middle chamber 8.
Only one partition 521 is disposed on the valve core 52, and the partition 521 is disposed between the high-pressure oil supply chamber P and the oil retum chamber T. When moving to different positions along With the valve core 52, the partition 521 separates or connects the outlet chamber A With the high-pressure oil supply chamber P and the oil retum chamber T.
With reference to FIG. 6, When the impact piston 3 starts to retum, the valve core 52 is at a left position to close the oil outlet 512, and high-pressure oil supplied to a hydraulic rock drill system enters the high-pressure oil supply chamber P and the piston front chamber 7 via a pipeline. Because the high-pressure oil supply chamber P is in communication With the balance chamber C, the valve core 52 keeps stationary at the left position under the action of the balance chamber C, and at the same time, the piston middle chamber 8, the oil retum chamber T, and the piston rear chamber 9 retum oil, that is, hydraulic pressure of the piston rear chamber 9 approaches 0, and the impact piston 3 accelerates retum under the action of the high-pressure oil in the piston front chamber 7. After the impact piston 3 accelerates over the retum control travel Sc, the signal oil port 41 is in communication With the piston front chamber 7, and the high-pressure oil in the piston front chamber 7 is fed back to the control chamber S of the reversing valve 5 via the signal oil port 41 and a feedback oil passage 6, so that hydraulic force of the control chamber S plus hydraulic force of the high-pressure oil supply chamber P is greater than hydraulic force of the balance chamber C. Under the action of the hydraulic force, the valve core 52 moves to the right to start retum reversing until the valve core 52 moves to a right limit position. In this process, a passage between the outlet chamber A and the oil 6 return Chamber T is gradually closed, and at the same time, the partition 521 gradually opens a passage between the outlet Chamber A and the high-pressure oil supply Chamber P, so that the outlet Chamber A outputs the high-pressure oil to the piston rear Chamber 9 via the oil outlet 512. When the valve core 52 moves to a middle position, the impact piston 3 starts retum braking. With Continued retum reversing of the valve Core 52, the outlet Chamber A is in Communication With the high-pressure oil supply Chamber P, so that both the piston front Chamber 7 and the piston rear Chamber 9 are supplied With the high-pressure oil. Because the hydraulic effective action area of the piston rear Chamber is larger than that of the piston front Chamber, the piston front Chamber 7 and the piston rear Chamber 9 are differentially connected, and the impact piston 3 continues retum braking. When the valve core 52 completes the retum reversing and is stationary at the right limit position, the retum speed of the impact piston 3 drops to zero.
When the valve Core 52 is stationary at the right limit position, the piston front Chamber 7 and the piston rear Chamber 9 are still differentially connected. However, because the hydraulic effective action area of the piston rear Chamber is larger than that of the piston front Chamber, hydraulic pressure of the piston rear Chamber 9 is greater than hydraulic force of the piston front Chamber 7, and the impact piston 3 starts stroke acceleration, When the first annular boss 31 of the impact piston 3 crosses a stroke control travel Sic on the right side of the signal oil port 41, the signal oil port 41 is in communication With the piston middle Chamber 8, and loW-pressure oil in the piston middle Chamber 8 enters the control Chamber S of the reversing valve 5 via the feedback oil passage 6. Because the hydraulic force of the high-pressure oil supply Chamber P is less than that of the balance Chamber C, the valve core 52 moves to the left, so that the passage between the outlet Chamber A and the high-pressure oil supply Chamber P is gradually closed, the outlet Chamber A is gradually in communication With the oil retum Chamber T. When the valve core 52 moves to the middle position, the impact piston 3 obtains a maximum speed to complete the stroke, and the valve core 52 continues to move to a left limit position to complete the stroke reversing. Then next retum is started.
As shown in FIG. 7, a second embodiment of a signal oil output structure of an impact Cylinder of a hydraulic rock drill in the present invention is substantially the same as the 7 first embodiment, except that the signal oil port 41 includes a first groove 42 disposed on the impact cylinder body 4, and the signal oil port 4l is in communication With the first groove 42. When the impact piston 3 retums, a distance between a left side of the first groove 42 and a left side of the first annular boss 3l is equal to a retum control travel Sc of the hydraulic rock drill, the retum control travel Sc starts. After the retum control travel Sc ends, the piston front chamber 7 is in communication With the control chamber S of the reversing valve 5 via the signal oil port 4l and the feedback oil passage 6. When the impact piston 3 strokes, and When a right side of the first annular boss 3l is flush With the right side of the signal oil port 4 l , a stroke control travel Sic starts. After the stroke control travel Sic ends, the piston middle chamber 8 is in communication With the control chamber S of the reversing valve 5 via the signal oil port 4l and the feedback oil passage 6.
As shown in FIG. 8, a third embodiment of a signal oil output structure of an impact cylinder of a hydraulic rock drill in the present invention is substantially the same as the first embodiment, except that a second groove 3 ll in communication With the piston front chamber 7 is disposed on the left side of the first annular boss 31, and a third groove 3 l2 in communication With the piston middle chamber 8 is disposed on the right side of the first annular boss 3l. When the impact piston 3 retums, and When a distance between a right side of the second groove 3 ll and the left side of the signal oil port 4l is equal to a retum control travel Sc of the hydraulic rock drill, the retum control travel Sc starts. After the retum control travel Sc ends, the piston front chamber 7 is in communication With the control chamber S of the reversing valve 5 via the second groove 3 l l, the signal oil port 4l, and the feedback oil passage 6.When the impact piston 3 strokes, and When a left side of the third groove 3 l2 is flush With the right side of the signal oil port 4l, a stroke control travel Sic starts. After the stroke control travel Sic ends, the piston middle chamber 8 is in communication With the control chamber S of the reversing valve 5 via the third groove 3 l2, the signal oil port 4l, and the feedback oil passage 6.
Described above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art may make many possible changes and modifications to the technical solution of the 8 present invention by using the foregoing disclosed technical content, or modify the technical solution into equivalent embodiments of equivalent changes, Without departing from the scope of the technical solution of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention Without departing from the content of the technical solution of the present invention shall fall Within the protection scope of the technical solution of the present invention.
Claims (5)
1. A reversing Valve for a hydraulic rock drill, comprising a valve body (53) and a valve core (52), Wherein a control chamber (S), a high-pressure oil supply chamber (P), an outlet chamber (A), an oil return chamber (T), and a balance chamber (C) are disposed in sequence between the valve body and the valve core; the control chamber is disposed at one end of the valve core, and the balance chamber is disposed at the other end of the valve core; only one partition (521) is disposed on the valve core, and the partition is disposed between the high-pressure oil supply chamber and the oil return chamber; in a process that the partition moves to the right along With the valve core, the oil return chamber is gradually partitioned from the outlet chamber, and the outlet chamber is gradually in communication With the high-pressure oil supply chamber; and in a process that the partition moves to the left along With the valve core, the oil retum chamber is gradually in communication With the outlet chamber, and the outlet chamber is gradually partitioned from the high-pressure oil supply chamber.
2. The reversing valve for the hydraulic rock drill according to claim 1, Wherein the balance chamber is in communication With the high-pressure oil supply chamber.
3. The reversing valve for the hydraulic rock drill according to claim 1, Wherein an oil inlet (511) in communication With the high-pressure oil supply chamber, an oil outlet (512) in communication With the outlet chamber, and an oil retum inlet(513) in communication With the oil retum chamber are disposed on the valve body.
4. The reversing valve for the hydraulic rock drill according to claim 3, Wherein the oil inlet and a piston front chamber (7) of an impact cylinder are connected in parallel to a system oil supply port, the oil outlet is in communication With a piston rear chamber (9) of the impact cylinder, and the oil retum inletis in communication With a piston middle chamber (8) of the impact cylinder.
5. The reversing valve for the hydraulic rock drill according to claim 1, Wherein a valve sleeve (53) is disposed on the periphery of the valve body, and a feedback oil passage (6) in communication With the control chamber is disposed on the valve body and the valve sleeve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110727313.7A CN113338790B (en) | 2021-06-29 | 2021-06-29 | Reversing valve of hydraulic rock drill |
| PCT/CN2021/140411 WO2023273226A1 (en) | 2021-06-29 | 2021-12-22 | Reversing valve for hydraulic rock drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE2350324A1 true SE2350324A1 (en) | 2023-03-23 |
Family
ID=77481525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE2350324A SE2350324A1 (en) | 2021-06-29 | 2021-12-22 | Reversing valve for hydraulic rock drill |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN113338790B (en) |
| SE (1) | SE2350324A1 (en) |
| WO (1) | WO2023273226A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236112A (en) * | 2021-06-29 | 2021-08-10 | 山河智能装备股份有限公司 | Signal oil output structure of hydraulic rock drill impact cylinder |
| CN113338790B (en) * | 2021-06-29 | 2024-01-30 | 山河智能装备股份有限公司 | Reversing valve of hydraulic rock drill |
| CN114000822B (en) * | 2021-10-23 | 2023-03-14 | 江西沃斯德凿岩液压有限公司 | Impact mechanism of rock drill |
| CN116220540A (en) * | 2023-03-06 | 2023-06-06 | 徐州徐工基础工程机械有限公司 | Impact part and impact mechanism |
| CN116556824B (en) * | 2023-07-07 | 2023-09-22 | 徐州徐工基础工程机械有限公司 | Impactor working mechanism and impactor |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11304023A (en) * | 1998-04-17 | 1999-11-05 | Komatsu Ltd | Three-way valve |
| JP4222205B2 (en) * | 2003-12-25 | 2009-02-12 | 株式会社デンソー | Solenoid spool valve |
| CN100441886C (en) * | 2004-11-12 | 2008-12-10 | 宁波华液机器制造有限公司 | Three-way ratio pressure reducing control valve |
| CN201090548Y (en) * | 2007-09-21 | 2008-07-23 | 兰州理工大学 | Vibration damping type hydraulic ratio control main valve |
| DE102008059437B3 (en) * | 2008-11-27 | 2010-01-07 | Parker Hannifin Gmbh & Co. Kg | Hydraulic control valve for controlling operating cylinder, has control spools, where each spool is associated with linear variable differential transformer and hydraulic pilot controller coupled to system, for separate control of spools |
| CN201786796U (en) * | 2010-09-25 | 2011-04-06 | 许新跃 | Numerical control proportion directional valve |
| CN202182076U (en) * | 2011-07-22 | 2012-04-04 | 深圳市普隆重工有限公司 | Hydraulic rock drill and oil distributing slide valve thereof |
| CN202370426U (en) * | 2011-12-16 | 2012-08-08 | 浙江志高机械有限公司 | Piston stroke fast adjusting device for hydraulic rock drill |
| CN102865386B (en) * | 2012-09-28 | 2014-03-12 | 张家港市普天机械制造有限公司 | Mechanical throttle valve |
| CN103322239B (en) * | 2013-06-26 | 2015-08-19 | 邱金成 | A kind of three lumen type 3-position 4-way gas control commutation hydrovalves |
| CN104154050B (en) * | 2014-07-29 | 2016-04-27 | 李田生 | Efficient hydraulic rock drill |
| CN204985126U (en) * | 2015-07-24 | 2016-01-20 | 烟台艾迪液压科技有限公司 | Hydraulic rock drill's impact switching -over device |
| JP6713778B2 (en) * | 2016-01-19 | 2020-06-24 | 古河ロックドリル株式会社 | Hydraulic hammering device |
| CN105526207B (en) * | 2016-01-28 | 2018-02-06 | 无锡必克液压股份有限公司 | Flow control system is matched somebody with somebody in a kind of hydraulic gate flat valve and its application |
| CN108019535B (en) * | 2018-01-04 | 2023-11-24 | 中国石油大学(北京) | Two-position three-way reversing valve with valve core adopting sealing conical surface |
| CN113236112A (en) * | 2021-06-29 | 2021-08-10 | 山河智能装备股份有限公司 | Signal oil output structure of hydraulic rock drill impact cylinder |
| CN113338790B (en) * | 2021-06-29 | 2024-01-30 | 山河智能装备股份有限公司 | Reversing valve of hydraulic rock drill |
-
2021
- 2021-06-29 CN CN202110727313.7A patent/CN113338790B/en active Active
- 2021-12-22 SE SE2350324A patent/SE2350324A1/en unknown
- 2021-12-22 WO PCT/CN2021/140411 patent/WO2023273226A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023273226A1 (en) | 2023-01-05 |
| CN113338790A (en) | 2021-09-03 |
| CN113338790B (en) | 2024-01-30 |
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