CN107013523B - 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
- CN107013523B CN107013523B CN201710335705.2A CN201710335705A CN107013523B CN 107013523 B CN107013523 B CN 107013523B CN 201710335705 A CN201710335705 A CN 201710335705A CN 107013523 B CN107013523 B CN 107013523B
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- Prior art keywords
- valve
- spool
- valve core
- oil
- piston
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- 238000000034 method Methods 0.000 title abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims description 62
- 239000010720 hydraulic oil Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010727 cylinder oil Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000203 mixture 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The present invention relates to the reversing arrangement and application method of a kind of hydraulic hammer.Its technical solution is to include solenoid directional control valve, valve oil distributing cover plate, valve core piston, upper fixing nut, upper valve base, spool, valve seat set, lower valve base, lower fixing nut, the valve oil distributing cover plate top is machined with the oilhole and solenoid directional control valve mounting 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；The spool is hollow cylinder, and valve core piston is the hollow cylinder with two steps, and the spool and valve core piston form 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 status, reduces leakage rate, improve hydraulic system volumetric efficiency；Due to the design of guiding valve seal length, the conducting between interlock valve road during working status is avoided, makes system work more reliable, avoids energy loss.
Description
Technical field
The present invention relates to the electro-hydraulic reversing valve and method of a kind of hydraulic pile hammer, 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 leakproofness is poor.Spool and valve port are there are certain seal length, therefore there are one for sliding valve movement
A dead band, is not in instantaneous conducting phenomenon between valve road.Poppet spool valve semi-cone angle is generally 12 °~20 °, and valve port is line when closing
Sealing, good seal performance and is active in one's movements, but needs multiple valves to be applied in combination, and achievees the purpose that multi-way reversing, was commutating
Easily occur instantaneously turning on phenomenon between valve road in journey.
The content of the invention
The purpose of the present invention is aiming at drawbacks described above existing in the 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 movement dead band, is not in instantaneous to logical phenomenon between valve road；Cone valve
There is provided the sealing under working status so that favorable sealing property.
Its technical solution 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）, spool（6）, valve seat set（7）, lower valve base（8）, lower fixing nut（9）And corresponding seal,
The 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 consolidated
Determine hole, valve oil distributing cover plate（2）Inside is the cylinder with three steps, for respectively with valve core piston（3）On two work
Plug face coordinate and with valve seat set（7）Coordinate；
The spool（6）For hollow cylinder, valve core piston（3）It is described for the hollow cylinder with two steps
Spool（6）And valve core piston（3）Valve core is formed after being connected through a screw thread；
The valve seat set（7）For hollow cylinder, inner cylinder and spool（6）Coordinate, exterior circular column is respectively with valve with oil
Cover board（2）, with cargo tank（10）On valve mounting hole coordinate,
The valve seat set（7）, upper valve base（5）, lower valve base（8）, upper fixing nut（4）, lower fixing nut（9）It is coaxial
Line installation forms valve body, and valve core lower part is installed in valve body, and valve core top is installed on valve oil distributing cover plate（2）It is interior；Institute
State valve oil distributing cover plate（2）, valve core, valve body effectively form a hydraulic cylinder, the work of hydraulic cylinder is formed above valve core
Plug portion, the piston portion of hydraulic cylinder, valve oil distributing cover plate are formed below valve core（2）The cylinder part of hydraulic cylinder is formed with after
Portion's end cap, valve body top form the drive end bearing bracket of hydraulic cylinder；Spool（6）Below part with partly coordinating below valve body,
Realize the switching function of two position three-way valve.
Above-mentioned spool（6）On be machined with center spool hole（62）With spool oil inlet passage hole（63）, spool drainback passage oil
Hole（61）, wherein, center spool hole（62）Top connection spool drainback passage oilhole（61）, lower part connection spool oil inlet passage
Hole（63）；Spool oil inlet passage hole（63）For connecting hydraulic oil oil inlet；Spool drainback passage oilhole（61）For connecting hydraulic pressure
Oily oil return；Spool（6）Intermediate step cylindrical surface both 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 spool 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 inlet access opening is covered equipped 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 spool oil inlet passage hole（63）, spool 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 spool；Upper valve base（5）, lower valve base（8）It is separately mounted to valve seat set（7）'s
Top and bottom, with 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 mentions, comprises the following steps：
Valve oil distributing cover plate（2）, valve core, valve body form a hydraulic cylinder, the work of hydraulic cylinder is formed above valve core
Plug portion, the piston portion of hydraulic cylinder, valve oil distributing cover plate are formed below valve core（2）The cylinder part of hydraulic cylinder is formed with after
Portion's end cap, valve body top form the drive end bearing bracket of hydraulic cylinder；Spool（6）Below part with partly coordinating below valve body,
Realize the switching function of two position three-way valve；
When solenoid valve control valve core piston moves up, hydraulic oil oil inlet passage is connected with centre bore, double media operation hydraulic pressure
Cylinder oil inlet, when solenoid valve control valve core piston moves down, hydraulic oil drainback passage is connected with centre bore, double media operation hydraulic cylinders
Oil return.
The beneficial effects of the invention are as follows：Due to the design of conical seal (contact) face, linear sealing is sealed into working status, is reduced
Leakage rate, improves hydraulic system volumetric efficiency；Since the design of guiding valve seal length is there are the dead band changed between working status,
The conducting between interlock valve road during working status is avoided, makes system work more reliable, avoids energy loss；It is so that of the invention
Have the advantages that the excellent leakage of sealing of the interlocking and cone valve between guiding valve path is small at the same time.
Brief description of the drawings
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the valve cover structure chart of the present invention；
Fig. 3 is the A-A structure charts of the valve cover of the present invention；
Fig. 4 is the valve core structure figure of the present invention；
Fig. 5 is the valve core piston structure chart of the present invention；
Fig. 6 is the valve seat noose composition of the present 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, spool 6, valve
Cover for seat 7, lower valve base 8, lower fixing nut 9, with cargo tank 10, valve core piston dummy piston 41, valve core piston working piston 42, spool
Drainback passage hole 61, center spool hole 62, spool oil inlet passage hole 63, sealing cone 65 under sealing cone 64, spool on spool,
Valve seat set oil return access opening 71, valve seat set oil inlet access opening 72.
Embodiment
As shown in Figure 1, the reversing arrangement for the hydraulic hammer that the present invention mentions, including solenoid directional control valve 1, valve oil distributing cover plate 2, valve
Core piston 3, upper fixing nut 4, upper valve base 5, spool 6, valve seat cover 7, lower valve base 8, lower fixing nut 9, with cargo tank 10, wherein
Spool is equipped with spool drainback passage hole 61, center spool hole 62, spool 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 inlet access opening 72.
As shown in Figure 1, solenoid valve 1 is installed on the upper face of valve oil distributing cover plate 2 by bolt.
2 top of valve oil distributing cover plate is machined with the oilhole and solenoid directional control valve 1 coordinated with solenoid directional control valve 1 as Figure 2-3
Mounting 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, it is 1 oil inlet of solenoid directional control valve and oil return that in addition valve oil distributing cover intralamellar part, which is machined with oilhole, and is incited somebody to action
The working solution pressure oil that solenoid directional control valve 1 controls, towards the epicoele and cavity of resorption of the working piston in valve core piston 3.
As shown in figure 4, spool 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 inlet；Drainback passage oilhole 61 is used to connect hydraulic oil oil return.It is close that spool intermediate step cylindrical surface both ends are machined with taper respectively
Envelope, 64,65, for cooperatively forming linear sealing with the sealing surface of 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 close for installing
The seal groove of sealing, forms two pistons 41,42.The relatively large step circles cylinder of diameter is working piston 42, 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, 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 be hollow cylinder, inner cylinder and spool cooperation, exterior circular column respectively with valve deck
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 definite with the oil inlet passage oilhole 63 on spool 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 spool
Conical seal (contact) face cooperatively form linear sealing.
As shown in Figure 1, spool 6 and valve core piston 4 form valve core after being connected through a screw thread, upper valve base 5, lower valve base 8 divide
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 installation of 9 coaxial line of lower fixing nut form valve body, and valve core lower part is installed on
In valve body, valve core top is installed in cover board.
The application method for the single spool two-position three way electro-hydraulic reversing valve that the present invention mentions is：
As shown in Figure 1, cover board 2, valve core, valve body effectively form a hydraulic cylinder, liquid is formed above valve core
The piston portion of cylinder pressure, forms the piston rod portion of hydraulic cylinder below spool 6, cover board form hydraulic cylinder cylinder part and after
Portion's end cap.Valve seat covers the drive end bearing bracket that 7 tops form hydraulic cylinder.Part covers with valve seat and partly coordinates below 7 below spool 6,
Realize the switching function of two position three-way valve.When solenoid valve control valve core piston 42 moves up, hydraulic oil oil inlet passage and centre bore
Connect, double media operation hydraulic cylinder oil inlets, when solenoid valve control valve core piston 42 moves down, hydraulic oil drainback passage and centre bore
Connect, double media operation hydraulic cylinder oil returns.
The advantages of single spool two-position three way electro-hydraulic reversing valve that the present invention mentions is：
Meanwhile have the advantages that the interlocking between guiding valve path and the excellent leakage of the sealing of cone valve are small.
The above, is only presently preferred embodiments of the present invention, and the limitation that non-invention is formal, every foundation are of the invention
Technical spirit simple modification, equivalent change and modification is done to above example, belong to technical solution of the present invention scope it
It is interior.
Claims (3)
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）, spool（6）, valve seat set（7）, lower valve base（8）, lower fixing nut（9）It is and corresponding
Seal, the 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 is the cylinder with three steps, for respectively with valve core piston（3）On two pistons
Face coordinate and with valve seat set（7）Coordinate；The spool（6）For hollow cylinder, valve core piston（3）For with two steps
Hollow cylinder, the spool（6）And valve core piston（3）Valve core is formed after being connected through a screw thread；The valve seat set（7）For
Hollow cylinder, inner cylinder and spool（6）Coordinate, exterior circular column respectively with valve oil distributing cover plate（2）, with cargo tank（10）On valve
Mounting hole coordinates；The valve seat set（7）, upper valve base（5）, lower valve base（8）, upper fixing nut（4）, lower fixing nut（9）'s
Coaxial line installation forms valve body, and valve core lower part 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 a hydraulic cylinder, form hydraulic cylinder above valve core
Piston portion, the piston rod portion of hydraulic cylinder, valve oil distributing cover plate are formed below valve core（2）Form the cylinder body portion of hydraulic cylinder
Divide and rear portion end cap, valve body top form the drive end bearing bracket of hydraulic cylinder；Spool（6）Below part and part below valve body
Coordinate；
The valve seat set（7）Oil inlet access opening is covered equipped with valve seat（72）, valve seat set oil return access opening（71）, and valve seat set oil inlet is led to
Road hole（72）, valve seat set oil return access opening（71）With spool oil inlet passage hole（63）, spool 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 spool 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, with 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 spool（6）On be machined with spool
Heart hole（62）With spool oil inlet passage hole（63）, spool drainback passage oilhole（61）, wherein, center spool hole（62）Top connect
Connect spool drainback passage oilhole（61）, lower part connection spool oil inlet passage hole（63）；Spool oil inlet passage hole（63）For connecting
Hydraulic oil oil inlet；Spool drainback passage oilhole（61）For connecting hydraulic oil oil return；Spool（6）Intermediate step cylindrical surface both ends point
Conical seal (contact) face is not machined with, for cooperatively forming linear sealing with the sealing surface of 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 spool
Pistons work piston（42）, it is the up and down motion for promoting spool that it, which is acted on,；The relatively small step of diameter is lived for valve core piston balance
Plug（41）, its effect is the hydraulic action of balance valve core top and bottom, reduces valve core movement resistance.
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 |
|---|---|---|---|
| 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 |
| CN201710335705.2A CN107013523B (en) | 2015-06-02 | 2015-06-02 | The reversing arrangement and application method of a kind of hydraulic 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 CN107013523A (en) | 2017-08-04 |
| CN107013523B true CN107013523B (en) | 2018-05-01 |
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| 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 |
| CN201710335705.2A Active CN107013523B (en) | 2015-06-02 | 2015-06-02 | The reversing arrangement and application method of a kind of hydraulic hammer |
Family Applications Before (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) | CN104912863B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109594561B (en) * | 2018-11-07 | 2020-10-27 | 太原理工大学 | Hydraulic linear impact vibration pile hammer machine |
| 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 |
Citations (4)
| 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 |
Family Cites Families (3)
| 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 |
| JP6015605B2 (en) * | 2013-09-17 | 2016-10-26 | 株式会社デンソー | Valve timing adjustment device |
| 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 CN201510294914.8A patent/CN104912863B/en active Active
- 2015-06-02 CN CN201710335705.2A patent/CN107013523B/en active Active
Patent Citations (4)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107013523A (en) | 2017-08-04 |
| CN104912863A (en) | 2015-09-16 |
| CN104912863B (en) | 2017-05-24 |
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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. |