CN107013523A - The reversing arrangement and application method of a kind of hydraulic hammer - Google Patents
The reversing arrangement and application method of a kind of hydraulic hammer Download PDFInfo
- Publication number
- CN107013523A CN107013523A CN201710335705.2A CN201710335705A CN107013523A CN 107013523 A CN107013523 A CN 107013523A CN 201710335705 A CN201710335705 A CN 201710335705A CN 107013523 A CN107013523 A CN 107013523A
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- Prior art keywords
- valve
- oil
- hydraulic
- valve core
- cylinder
- Prior art date
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Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 239000003921 oil Substances 0.000 claims description 59
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010727 cylinder oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012224 working solution Substances 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
- E02D7/10—Power-driven drivers with pressure-actuated hammer, i.e. the pressure fluid acting directly on the hammer structure
Abstract
The present invention relates to a kind of reversing arrangement of hydraulic hammer and application method.Its technical scheme is to include solenoid directional control valve, valve oil distributing cover plate, valve core piston, upper fixing nut, upper valve base, valve element, valve seat set, lower valve base, lower fixing nut, described valve oil distributing cover plate top is machined with the oilhole and solenoid directional control valve fixing hole coordinated with solenoid directional control valve, valve oil distributing cover intralamellar part is the cylinder with three steps, is coordinated for coordinating respectively with two piston areas on valve core piston and being covered with valve seat；Described valve element is hollow cylinder, and valve core piston is the hollow cylinder with two steps, and the valve element and valve core piston constitute valve core after being connected through a screw thread.Beneficial effect is：Due to the design of conical seal (contact) face, linear sealing is sealed into working condition, leakage rate is reduced, hydraulic system volumetric efficiency is improved；Due to the design of guiding valve seal length, it is to avoid the conducting during working condition between interlock valve road, make system work more reliable, it is to avoid energy loss.
Description
Technical field
The present invention relates to a kind of electro-hydraulic reversing valve of hydraulic pile hammer and method, more particularly to a kind of changing for hydraulic hammer
To device and application method.
Background technology
At present, the hydraulicdirectional control valve used in hydraulic pile hammer is divided into guiding valve and 2/2-way cone valve by spool type,
Wherein guiding valve is clearance seal, and sealing is poor.There is certain seal length in valve element, therefore sliding valve movement has one with valve port
Individual dead band, is not in instantaneous conducting phenomenon between valve road.Poppet spool valve semi-cone angle is generally 12 °~20 °, is line when valve port is closed
Sealing, good seal performance and is active in one's movements, but needs multiple valves to be applied in combination, and reaches the purpose of multi-way reversing, was commutating
Easily occurs instantaneous conducting phenomenon between valve road in journey.
The content of the invention
The drawbacks described above that the purpose of the present invention is present aiming at prior art there is provided a kind of reversing arrangement of hydraulic hammer and
Application method, reduces the seal length of guiding valve, retains a motion dead band, is not in instantaneous to logical phenomenon between valve road；Cone valve
There is provided the sealing under working condition so that favorable sealing property.
Its technical scheme is to include solenoid directional control valve（1）, valve oil distributing cover plate（2）, valve core piston（3）, upper fixing nut
（4）, upper valve base（5）, valve element（6）, valve seat set（7）, lower valve base（8）, lower fixing nut（9）And corresponding seal,
Described valve oil distributing cover plate（2）Top is machined with and solenoid directional control valve（1）The oilhole and solenoid directional control valve fixing hole of cooperation,
Valve oil distributing cover plate（2）Inside be the cylinder with three steps, for respectively with valve core piston（3）On two piston areas match somebody with somebody
Close and with valve seat set（7）Coordinate；
Described valve element（6）For hollow cylinder, valve core piston（3）For the hollow cylinder with two steps, the valve element
（6）And valve core piston（3）Valve core is constituted after being connected through a screw thread；
The valve seat set（7）For hollow cylinder, inner cylinder and valve element（6）Coordinate, exterior circular column respectively with valve oil distributing cover plate
（2）, with cargo tank（10）On valve mounting hole coordinate,
Described valve seat set（7）, upper valve base（5）, lower valve base（8）, upper fixing nut（4）, lower fixing nut（9）Coaxial line peace
Dress constitutes valve body, and valve core bottom is installed in valve body, and valve core top is installed on valve oil distributing cover plate（2）It is interior；The valve
Oil distributing cover plate（2）, valve core, valve body effectively form the piston portion that hydraulic cylinder is constituted above a hydraulic cylinder, valve core
Point, the piston portion of hydraulic cylinder, valve oil distributing cover plate are constituted below valve core（2）Constitute the cylinder part and posterior end of hydraulic cylinder
Lid, valve body top constitutes the drive end bearing bracket of hydraulic cylinder；Valve element（6）Below part with partly coordinate below valve body, realize
The switching function of two position three-way valve.
Above-mentioned valve element（6）On be machined with center spool hole（62）With valve element oil inlet passage hole（63）, valve element drainback passage oil
Hole（61）, wherein, center spool hole（62）Top connection valve element drainback passage oilhole（61）, bottom connection valve element oil inlet passage
Hole（63）；Valve element oil inlet passage hole（63）For connecting hydraulic oil oil-feed；Valve element drainback passage oilhole（61）For connecting hydraulic pressure
Oily oil return；Valve element（6）Intermediate step face of cylinder two ends are machined with conical seal (contact) face respectively, for upper valve base, lower valve base it is close
Front cover cooperatively forms linear sealing.
Above-mentioned valve core piston（3）Two steps on be machined with seal groove for installing seal, form two work
Plug face；The relatively large step circles cylinder of diameter is valve core piston working piston（42）, it is the up and down motion for promoting valve element that it, which is acted on,；
The relatively small step of diameter is valve core piston dummy piston（41）, its effect is the hydraulic action of balance valve core top and bottom
Power, reduces valve core movement resistance.
Above-mentioned valve seat set（7）Oil-feed access opening is covered provided with valve seat（72）, valve seat set oil return access opening（71）, and valve seat packs into
Oily access opening（72）, valve seat set oil return access opening（71）With valve element oil inlet passage hole（63）, valve element drainback passage oilhole（61）Even
It is logical.
Above-mentioned upper valve base（5）, lower valve base（8）It is set shape structure, in one end inner surface processing conical seal (contact) face of set, uses
In cooperatively forming linear sealing with the conical seal (contact) face on valve element；Upper valve base（5）, lower valve base（8）It is separately mounted to valve seat set（7）'s
Top and bottom, use fixing nut（4）, lower fixing nut（9）It is fixed on valve seat set（7）It is interior.
A kind of application method of the reversing arrangement for hydraulic hammer that the present invention is mentioned, comprises the following steps：
Valve oil distributing cover plate（2）, valve core, valve body constitute a hydraulic cylinder, the piston portion of hydraulic cylinder is constituted above valve core
Point, the piston portion of hydraulic cylinder, valve oil distributing cover plate are constituted below valve core（2）Constitute the cylinder part and posterior end of hydraulic cylinder
Lid, valve body top constitutes the drive end bearing bracket of hydraulic cylinder；Valve element（6）Below part with partly coordinate below valve body, realize
The switching function of two position three-way valve；
When solenoid valve control valve core piston is moved up, hydraulic oil oil inlet passage is connected with centre bore, and double media operation hydraulic cylinders enter
Oil, when solenoid valve control valve core piston is moved down, hydraulic oil drainback passage is connected with centre bore, and double media operation hydraulic cylinders are returned
Oil.
The beneficial effects of the invention are as follows：Due to the design of conical seal (contact) face, linear sealing is sealed into working condition, is reduced
Leakage rate, improves hydraulic system volumetric efficiency；Because there is the dead band changed between working condition in the design of guiding valve seal length,
The conducting between interlock valve road during working condition is avoided, makes system work more reliable, it is to avoid energy loss；So that of the invention
Have the advantages that the excellent leakage of the sealing of interlocking and cone valve between guiding valve path is small simultaneously.
Brief description of the drawings
Fig. 1 is structure chart of the invention；
Fig. 2 is valve cover structure chart of the invention；
Fig. 3 is the A-A structure charts of the valve cover of the present invention；
Fig. 4 is valve core structure figure of the invention；
Fig. 5 is valve core piston structure chart of the invention；
Fig. 6 is valve seat noose composition of the invention；
In upper figure：Solenoid directional control valve 1, valve oil distributing cover plate 2, valve core piston 3, upper fixing nut 4, upper valve base 5, valve element 6, valve seat set
7th, lower valve base 8, lower fixing nut 9, with cargo tank 10, valve core piston dummy piston 41, valve core piston working piston 42, valve element oil return
Access opening 61, center spool hole 62, valve element oil inlet passage hole 63, sealing cone 65, valve seat under sealing cone 64, valve element on valve element
Cover oil return access opening 71, valve seat set oil-feed access opening 72.
Embodiment
As shown in figure 1, the reversing arrangement for the hydraulic hammer that the present invention is mentioned, including solenoid directional control valve 1, valve oil distributing cover plate 2, valve
Core piston 3, upper fixing nut 4, upper valve base 5, valve element 6, valve seat cover 7, lower valve base 8, lower fixing nut 9, with cargo tank 10, wherein
Valve element is provided with valve element drainback passage hole 61, center spool hole 62, valve element oil inlet passage hole 63, is arranged in valve seat in respect of valve seat
Cover oil return access opening 71, valve seat set oil-feed access opening 72.
As shown in figure 1, magnetic valve 1 is arranged on the upper face of valve oil distributing cover plate 2 by bolt.
The top of valve oil distributing cover plate 2 is machined with the oilhole and solenoid directional control valve 1 coordinated with solenoid directional control valve 1 as Figure 2-3
Fixing hole, the inside of valve oil distributing cover plate 2 is the cylinder with three steps, is respectively used to and two piston areas on valve core piston
Coordinate and covered with valve seat and coordinated, valve oil distributing cover intralamellar part is machined with oilhole for the oil-feed of solenoid directional control valve 1 and oil return in addition, and will
The working solution force feed that solenoid directional control valve 1 is controlled, towards the epicoele and cavity of resorption of the working piston in valve core piston 3.
As shown in figure 4, valve element 6 is hollow cylinder, center oilhole 62 and oil inlet passage oilhole 63, oil return are machined with thereon
Passage oilhole 61.As shown in figure 1, wherein center oilhole connects 62 work oilholes；Oil inlet passage oilhole 63 is used to connect hydraulic oil
Oil-feed；Drainback passage oilhole 61 is used to connect hydraulic oil oil return.It is close that valve element intermediate step face of cylinder two ends are machined with taper respectively
Envelope, 64,65, cooperatively form linear sealing for the sealing surface with upper valve base 5, lower valve base 8.
As shown in figure 5, valve core piston is the hollow cylinder with two steps, it is machined with step for installing close
The seal groove of sealing, forms two pistons 41,42.The relatively large step circles cylinder of diameter is working piston 42, and its effect is to push away
The up and down motion of movable valve plug；The relatively small step of diameter is dummy piston 41, and its effect is the liquid of balance valve core top and bottom
Active force is pressed, reduces valve core movement resistance.
As shown in fig. 6, valve seat set 7 is hollow cylinder, inner cylinder and valve element coordinate, exterior circular column respectively with bonnet
Plate, with cargo tank valve mounting hole coordinate.Valve seat set 7 is also configured with oil inlet passage oilhole 72, drainback passage oilhole 71, these
Oil inlet passage oilhole 72, drainback passage oilhole 71 have determination with the oil inlet passage oilhole 63 on valve element 6, drainback passage oilhole 61
Position relationship.
Upper valve base, lower valve base are set shape structure, in one end inner surface processing conical seal (contact) face of set, for valve element
Conical seal (contact) face cooperatively form linear sealing.
As shown in figure 1, valve element 6 and valve core piston 4 constitute valve core, 8 points of upper valve base 5, lower valve base after being connected through a screw thread
Not An Zhuan valve seat set 7 top and bottom, with fixing nut 4, lower fixing nut 9 be fixed on valve seat set 7 in.Valve seat set 7,
Upper valve base 5, lower valve base 8, upper fixing nut 4, the coaxial line of lower fixing nut 9, which are installed, constitutes valve body, and valve core bottom is installed on
In valve body, valve core top is installed in cover plate.
The application method for the single spool two-position three way electro-hydraulic reversing valve that the present invention is mentioned is：
As shown in figure 1, cover plate 2, valve core, valve body are effectively formed constitutes hydraulic cylinder above a hydraulic cylinder, valve core
Piston portion, the piston rod portion of hydraulic cylinder is constituted below valve element 6, cover plate constitutes the cylinder part and posterior end of hydraulic cylinder
Lid.Valve seat covers the drive end bearing bracket that 7 tops constitute hydraulic cylinder.Part is realized with partly coordinating below valve seat set 7 below valve element 6
The switching function of two position three-way valve.When solenoid valve control valve core piston 42 is moved up, hydraulic oil oil inlet passage is connected with centre bore,
Double media operation hydraulic cylinder oil-feeds, when solenoid valve control valve core piston 42 is moved down, hydraulic oil drainback passage is connected with centre bore,
Double media operation hydraulic cylinder oil returns.
The advantage for the single spool two-position three way electro-hydraulic reversing valve that the present invention is mentioned is：
Meanwhile, have the advantages that the excellent leakage of the sealing of interlocking and cone valve between guiding valve path is small.
It is described above, only it is presently preferred embodiments of the present invention, and the limitation of non-invention in form, it is every according to the present invention
Technical spirit simple modification, equivalent variations and modification are made to above example, belong to technical solution of the present invention scope it
It is interior.
Claims (4)
1. a kind of reversing arrangement of hydraulic hammer, it is characterized in that：Including solenoid directional control valve（1）, valve oil distributing cover plate（2）, valve core piston
（3）, upper fixing nut（4）, upper valve base（5）, valve element（6）, valve seat set（7）, lower valve base（8）, lower fixing nut（9）And it is corresponding
Seal, described valve oil distributing cover plate（2）Top is machined with and solenoid directional control valve（1）The oilhole and solenoid directional control valve of cooperation are fixed
Hole, valve oil distributing cover plate（2）Inside be the cylinder with three steps, for respectively with valve core piston（3）On two pistons
Face coordinate and with valve seat set（7）Coordinate；Described valve element（6）For hollow cylinder, valve core piston（3）For with two steps
Hollow cylinder, the valve element（6）And valve core piston（3）Valve core is constituted after being connected through a screw thread；The valve seat set（7）For
Hollow cylinder, inner cylinder and valve element（6）Coordinate, exterior circular column respectively with valve oil distributing cover plate（2）, with cargo tank（10）On valve
Mounting hole coordinates；Described valve seat set（7）, upper valve base（5）, lower valve base（8）, upper fixing nut（4）, lower fixing nut（9）'s
Coaxial line, which is installed, constitutes valve body, and valve core bottom is installed in valve body, and valve core top is installed on valve oil distributing cover plate（2）
It is interior；The valve oil distributing cover plate（2）, valve core, valve body effectively form and constitute hydraulic cylinder above a hydraulic cylinder, valve core
Piston portion, the piston rod portion of hydraulic cylinder, valve oil distributing cover plate are constituted below valve core（2）Constitute the cylinder body portion of hydraulic cylinder
Divide and rear portion end cap, valve body top constitutes the drive end bearing bracket of hydraulic cylinder；Valve element（6）Below part and part below valve body
Coordinate, realize the switching function of two position three-way valve；
The valve seat set（7）Oil-feed access opening is covered provided with valve seat（72）, valve seat set oil return access opening（71）, and valve seat set oil-feed is logical
Road hole（72）, valve seat set oil return access opening（71）With valve element oil inlet passage hole（63）, valve element drainback passage oilhole（61）Connection；
The upper valve base（5）, lower valve base（8）Be set shape structure, in one end inner surface processing conical seal (contact) face of set, for
Conical seal (contact) face on valve element cooperatively forms linear sealing；Upper valve base（5）, lower valve base（8）It is separately mounted to valve seat set（7）Upper end
And lower end, use fixing nut（4）, lower fixing nut（9）It is fixed on valve seat set（7）It is interior.
2. the reversing arrangement of hydraulic hammer according to claim 1, it is characterized in that：The valve element（6）On be machined with valve element
Heart hole（62）With valve element oil inlet passage hole（63）, valve element drainback passage oilhole（61）, wherein, center spool hole（62）Top connect
Connect valve element drainback passage oilhole（61）, bottom connection valve element oil inlet passage hole（63）；Valve element oil inlet passage hole（63）For connecting
Hydraulic oil oil-feed；Valve element drainback passage oilhole（61）For connecting hydraulic oil oil return；Valve element（6）Intermediate step face of cylinder two ends point
Conical seal (contact) face is not machined with, linear sealing is cooperatively formed for the sealing surface with upper valve base, lower valve base.
3. the reversing arrangement of hydraulic hammer according to claim 1, it is characterized in that：The valve core piston（3）Two steps
On be machined with seal groove for installing seal, form two piston areas；The relatively large step circles cylinder of diameter is valve element
Pistons work piston（42）, it is the up and down motion for promoting valve element that it, which is acted on,；The relatively small step of diameter is that valve core piston balances work
Plug（41）, its effect is the hydraulic action of balance valve core top and bottom, reduces valve core movement resistance.
4. a kind of application method of the reversing arrangement of hydraulic hammer as any one of claim 1-3, it is characterized in that, including
Following steps：
Valve oil distributing cover plate（2）, valve core, valve body constitute a hydraulic cylinder, the piston portion of hydraulic cylinder is constituted above valve core
Point, the piston rod portion of hydraulic cylinder, valve oil distributing cover plate are constituted below valve core（2）Constitute cylinder part and the rear portion of hydraulic cylinder
End cap, valve body top constitutes the drive end bearing bracket of hydraulic cylinder；Valve element（6）Below part with partly coordinating below valve body, it is real
The switching function of existing two position three-way valve；
When solenoid valve control valve core piston is moved up, hydraulic oil oil inlet passage is connected with centre bore, and double media operation hydraulic cylinders enter
Oil, when solenoid valve control valve core piston is moved down, hydraulic oil drainback passage is connected with centre bore, and double media operation hydraulic cylinders are returned
Oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710335705.2A CN107013523B (en) | 2015-06-02 | 2015-06-02 | The reversing arrangement and application method of a kind of hydraulic hammer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710335705.2A CN107013523B (en) | 2015-06-02 | 2015-06-02 | The reversing arrangement and application method of a kind of hydraulic hammer |
| CN201510294914.8A CN104912863B (en) | 2015-06-02 | 2015-06-02 | Single-valve-core two-position three-way electro-hydraulic change valve applied to hydraulic pile hammer |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510294914.8A Division CN104912863B (en) | 2015-06-02 | 2015-06-02 | Single-valve-core two-position three-way electro-hydraulic change valve applied to hydraulic pile hammer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107013523A true CN107013523A (en) | 2017-08-04 |
| CN107013523B CN107013523B (en) | 2018-05-01 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710335705.2A Active CN107013523B (en) | 2015-06-02 | 2015-06-02 | The reversing arrangement and application method of a kind of hydraulic hammer |
| CN201510294914.8A Active CN104912863B (en) | 2015-06-02 | 2015-06-02 | Single-valve-core two-position three-way electro-hydraulic change valve applied to hydraulic pile hammer |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510294914.8A Active CN104912863B (en) | 2015-06-02 | 2015-06-02 | Single-valve-core two-position three-way electro-hydraulic change valve applied to hydraulic pile hammer |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN107013523B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020093618A1 (en) * | 2018-11-07 | 2020-05-14 | 太原理工大学 | Hydraulic linear impact vibration pile hammer machine |
| CN113958726A (en) * | 2021-10-19 | 2022-01-21 | 涌镇液压机械（上海）有限公司 | Valve core structure of inward flow type reversing valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2259749A (en) * | 1991-09-20 | 1993-03-24 | Mannesmann Ag | A valve spool |
| CN2340990Y (en) * | 1997-12-31 | 1999-09-29 | 张健华 | Piston controlling valve for various hydraulic pile hammer |
| CN1763384A (en) * | 2004-09-29 | 2006-04-26 | 马克阀门公司 | Directly operated pneumatic valve having a differential assist return |
| CN201891689U (en) * | 2010-11-30 | 2011-07-06 | 天津工程机械研究院 | Cartridge inserted two-position three-way electro-hydraulic reversing valve |
| US20150075460A1 (en) * | 2013-09-17 | 2015-03-19 | Denso Corporation | Valve timing control apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2949231C2 (en) * | 1979-12-07 | 1984-12-13 | Mannesmann Rexroth GmbH, 8770 Lohr | Pressure medium valve, in particular pressure reducing valve |
| CN204783908U (en) * | 2015-06-02 | 2015-11-18 | 东营华晏石油技术有限公司 | A single valve core two -position three way electro -hydraulic reversing valve for hydraulic pile driving hammer |
-
2015
- 2015-06-02 CN CN201710335705.2A patent/CN107013523B/en active Active
- 2015-06-02 CN CN201510294914.8A patent/CN104912863B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2259749A (en) * | 1991-09-20 | 1993-03-24 | Mannesmann Ag | A valve spool |
| CN2340990Y (en) * | 1997-12-31 | 1999-09-29 | 张健华 | Piston controlling valve for various hydraulic pile hammer |
| CN1763384A (en) * | 2004-09-29 | 2006-04-26 | 马克阀门公司 | Directly operated pneumatic valve having a differential assist return |
| CN201891689U (en) * | 2010-11-30 | 2011-07-06 | 天津工程机械研究院 | Cartridge inserted two-position three-way electro-hydraulic reversing valve |
| US20150075460A1 (en) * | 2013-09-17 | 2015-03-19 | Denso Corporation | Valve timing control apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020093618A1 (en) * | 2018-11-07 | 2020-05-14 | 太原理工大学 | Hydraulic linear impact vibration pile hammer machine |
| CN113958726A (en) * | 2021-10-19 | 2022-01-21 | 涌镇液压机械（上海）有限公司 | Valve core structure of inward flow type reversing valve |
| CN113958726B (en) * | 2021-10-19 | 2024-03-08 | 涌镇液压机械（上海）有限公司 | Valve core structure of internal flow reversing valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104912863B (en) | 2017-05-24 |
| CN104912863A (en) | 2015-09-16 |
| CN107013523B (en) | 2018-05-01 |
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Effective date of registration: 20180404 Address after: Taizhou City, Zhejiang province 317523 Wenling Zeguo town under Chen Village A District No. 68 Applicant after: Taizhou Environmental Protection Technology Co., Ltd. Li Wei Address before: 257300 Yingbin Road, Guangrao County, Dongying, Shandong Province, No. 48 Applicant before: Li Yixuan |
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Application publication date: 20170804 Assignee: Wenzhou Qifang new energy Co., Ltd Assignor: TAIZHOU LIWEI ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Contract record no.: X2021330000074 Denomination of invention: A reversing device of hydraulic hammer and its application method Granted publication date: 20180501 License type: Common License Record date: 20210817 |
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Effective date of registration: 20210909 Address after: 550000 east side of No. 1 plant in Guiyang Jingteng Heavy Machinery Co., Ltd., Wangkuan village, economic and Technological Development Zone, Guiyang City, Guizhou Province Patentee after: Guiyang Jingheng Electromechanical Technology Co.,Ltd. Address before: 317523 No. 68, A District, lower Chen Village, Chengguo Town, Wenling City, Taizhou, Zhejiang. Patentee before: TAIZHOU LIWEI ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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Address after: 550000 east side of No. 1 plant in Guiyang Jingteng Heavy Machinery Co., Ltd., Wangkuan village, economic and Technological Development Zone, Guiyang City, Guizhou Province Patentee after: Guiyang Wanli Forging Technology Co.,Ltd. Address before: 550000 east side of No. 1 plant in Guiyang Jingteng Heavy Machinery Co., Ltd., Wangkuan village, economic and Technological Development Zone, Guiyang City, Guizhou Province Patentee before: Guiyang Jingheng Electromechanical Technology Co.,Ltd. |