CN102777663A - Electro-mechanical dual control pilot valve for unloading valve - Google Patents
Electro-mechanical dual control pilot valve for unloading valve Download PDFInfo
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- CN102777663A CN102777663A CN2012102453806A CN201210245380A CN102777663A CN 102777663 A CN102777663 A CN 102777663A CN 2012102453806 A CN2012102453806 A CN 2012102453806A CN 201210245380 A CN201210245380 A CN 201210245380A CN 102777663 A CN102777663 A CN 102777663A
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- unloading
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- 230000009977 dual effect Effects 0.000 title abstract 5
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims description 26
- 230000009471 action Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000037361 pathway Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses an electro-mechanical dual control pilot valve for an unloading valve. The problems of complicated structure, large manufacture difficulty and maintaining inconvenience in the prior art are overcome. The electro-mechanical dual control pilot valve for the unloading valve is characterized in that a valve body communication hole and a secondary valve body communication hole are interconnected to form a high-pressure fluid channel for supplying liquid by a solenoid pilot valve, or a valve body counter bore is added to form the high-pressure fluid channel for supplying liquid by the solenoid pilot valve together with a secondary valve body counter bore and a one-way valve assembly; the valve body communication hole and the secondary valve body communication hole are correspondingly communicated to form a liquid inlet channel and a liquid return channel; two secondary valve body main holes are processed on the secondary valve body; a cartridge valve core is inserted into a first main hole of the secondary valve body; a filter core or the filter core containing a rapid joint seat externally connected with an accumulator is arranged inside a second main hole of the secondary valve body; and the secondary valve is arranged on the back side of a mechanical pilot valve, and the solenoid pilot valve is arranged on the secondary valve. The electro-mechanical dual control pilot valve has the beneficial effects that high-pressure liquid does not need to be externally connected; the filter and the one-way valve do not need to be externally connected, and the electro-mechanical dual control pilot valve has the filter function and one-way valve function, is simple in structure, reduces the manufacture difficulty and brings about convenience for maintenance.
Description
Technical field
The invention belongs to pumping plant control apparatus technical field, particularly a kind of dynamo-electric two control pilot valves that are used for unloading valve of colliery emulsion pump.
Background technique
The pilot valve of existing technology emulsion power pack hydraulic unloading valve; Come liquid orifice plug and control piston orifice plug to form by valve body, valve seat, spool, step-up piston, strong spring and impulse orifice plug, pump, the pilot valve of this hydraulic control structure can only be realized hydraulic unloading; And the pressure surge value is bigger; Simultaneously, the pilot valve of this structure can not be realized No Load Start and unloaded termination of pumping, and adjustment pressure also needs manpower control.A kind of mechanism that hydraulic unloading and automatically controlled off-load are installed on a covering device is simultaneously also arranged in the existing technology, but it can only be through switch realizing automatically controlled off-load or hydraulic unloading, when malfunctioning or automatical control system was not charged in automatically controlled off-load, hydraulic unloading can not be worked automatically.
In order to solve the problems of the technologies described above; The application number that the applicant proposes is 201010000599.0 and is called a kind of automatically controlled off-load and hydraulic unloading to be provided in " a kind of pump is with the pilot valve of unloading valve " patent and to have deposited; The pressure surge value can be controlled by setting value; Can realize No Load Start and unloaded termination of pumping, and in automatically controlled off-load when malfunctioning or automatical control system is not charged, the pump that hydraulic unloading is launched automatically is with the pilot valve of unloading valve.But the technical problem that technique scheme exists is, automatically controlled by-pass switch valve is installed in the pilot valve body, and then manufacture difficulty is big, and maintenance is inconvenient, but also need be connected the overall structure more complicated through transition connecting plate with electromagnetic priority valve; And at the automatically controlled by-pass switch valve of the external installation of pilot valve, because electromagnetic priority valve is positioned at automatically controlled by-pass switch valve below, not only take than large space; The maintenance electromagnetic priority valve is also very inconvenient from the bottom, in addition, and in order to guarantee the high reliability of automatically controlled off-load and hydraulic unloading; Also need external one-way valve to store high pressure liquid; So that before the next turn on pump, can there be high pressure liquid to go control with the solenoid valve of the pilot valve of unloading valve, reach the purpose of No Load Start.In order to guarantee not contained in the valve contamination of working fluid of dirt, also want external filter, because one-way valve and filter all are external, thereby make the equipment integral size bigger, also need some links, increased manufacture cost.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiency of existing technology, provide a kind of simple in structure, easy to maintenance, less a kind of dynamo-electric two control pilot valves that are used for pump with unloading valve take up room.
The technological scheme that the present invention adopts comprises mechanical pilot valve, plays the secondary valve and the electromagnetic priority valve of automatically controlled by-pass switch valve action; Said mechanical pilot valve comprises valve body, valve seat, spool, spring spool and voltage regulation screw, on said valve body, be processed with valve body first fluid passage of linking up with auxiliary hole and valve body second fluid passage of linking up with auxiliary hole and with the valve body intercommunicating pore that comes the liquid mouth to be communicated with; Said secondary valve comprises auxiliary valve body, plug-in mounting spool and secondary valve push rod; Be processed with on the auxiliary valve body with valve body on valve body first fluid passage and corresponding auxiliary valve body first fluid passage and auxiliary valve body second fluid passage of valve body second fluid passage; The auxiliary valve body intercommunicating pore that on said auxiliary valve body, is processed with auxiliary valve body first main aperture and auxiliary valve body second main aperture and is communicated with and is communicated with the valve body intercommunicating pore with the auxiliary valve body second main aperture inner chamber; Plug-in mounting spool and secondary valve push rod are installed in auxiliary valve body first main aperture, filter core are installed in auxiliary valve body second main aperture or are contained the filter core of external accumulator rapid pipe joint seat.
On said valve body, be processed with the valve body counterbore that is communicated with the valve body intercommunicating pore; On said auxiliary valve body, be processed with the auxiliary valve body counterbore that is communicated with the auxiliary valve body intercommunicating pore; Form the one-way valve inner chamber by said valve body counterbore and auxiliary valve body counterbore, in this one-way valve inner chamber, check valve assembly is installed.
Said plug-in mounting spool is made up of auxiliary-seat cover, auxiliary-seat, auxiliary valve core and secondary valve end cover.
Said check valve assembly comprises banking stop, unidirectional valve seat, steel ball, connecting sleeve and spring.
Said secondary valve is installed in the back side of mechanical pilot valve.
Said electromagnetic priority valve be installed in secondary valve above.
Compared with prior art, the invention has the beneficial effects as follows:
(1) owing on valve body, is processed with and the valve body intercommunicating pore that comes the liquid mouth to be communicated with; On auxiliary valve body, be processed with the auxiliary valve body intercommunicating pore that is communicated with and is communicated with the auxiliary valve body second main aperture inner chamber with the valve body intercommunicating pore; By valve body intercommunicating pore and the corresponding high pressure liquid passage that consists of the electromagnetic priority valve feed flow of linking up of auxiliary valve body intercommunicating pore; Do not need external high pressure liquid, structure is simpler.
(2) owing on valve body, be processed with valve body first fluid passage of linking up and valve body second fluid passage of linking up with auxiliary hole with auxiliary hole; Be processed with on the auxiliary valve body with valve body on valve body first fluid passage and corresponding auxiliary valve body first fluid passage and auxiliary valve body second fluid passage of valve body second fluid passage, and be connected by valve body first fluid passage and auxiliary valve body first fluid passage and constitute feed pathway; Be connected with auxiliary valve body second fluid passage by valve body second fluid passage and constitute back flow channel; The secondary valve of automatically controlled by-pass switch valve action is become a reality above being independent of the secondary valve that has been placed on automatically controlled by-pass switch valve action outside the mechanical pilot valve and with electromagnetic priority valve; Dwindle the overall dimensions of this valve and reduced manufacture difficulty; Also failure judgement occurs on the secondary valve or occurs on the mechanical pilot valve easily, for maintenance has brought convenience;
(3) owing on auxiliary valve body, be processed with auxiliary valve body first main aperture and auxiliary valve body second main aperture; The plug-in mounting spool is installed in auxiliary valve body first main aperture; Make the secondary valve that has keeped in repair automatically controlled by-pass switch valve action more convenient; Filter core is installed in auxiliary valve body second main aperture or is contained the filter core of external accumulator rapid pipe joint seat, make the present invention not need external filter, self has filter function;
(4) owing on valve body, be processed with the valve body counterbore that is communicated with the valve body intercommunicating pore; On auxiliary valve body, be processed with the auxiliary valve body counterbore that is communicated with the auxiliary valve body intercommunicating pore; Form the one-way valve inner chamber by said valve body counterbore and auxiliary valve body counterbore, in this one-way valve inner chamber, check valve assembly is installed, what constitute the band one-way valve is the high pressure liquid passage of electromagnetic priority valve feed flow; Make the present invention not need external one-way valve, self has non-return valve function.
Description of drawings
Fig. 1 is a structural drawing of the present invention,
Fig. 2 is the A-A sectional view of Fig. 1,
Fig. 3 is the structural drawing of band one-way valve of the present invention,
Fig. 4 is the C-C sectional view of Fig. 3
Fig. 5 is the B portion enlarged view of Fig. 3.
Among the figure:
1. mechanical pilot valve,
1-1. valve body,
1-1-1. valve body first fluid passage, 1-1-2. valve body second fluid passage,
1-1-3. the valve body counterbore, 1-1-4. valve body intercommunicating pore,
1-2. valve seat,
1-3. spool,
1-4. spring spool,
1-5. voltage regulation screw,
2. secondary valve,
2-1. auxiliary valve body,
2-1-1. auxiliary valve body first fluid passage, 2-1-2. auxiliary valve body second fluid passage,
2-1-3. secondary valve feed flow hole, 2-1-4. auxiliary valve body counterbore,
2-1-5. secondary valve intercommunicating pore, the secondary valve push rod of 2-1-6. control hole,
2-2. the plug-in mounting spool,
2-2-1. the auxiliary-seat cover, the 2-2-2. auxiliary-seat,
2-2-3. auxiliary valve core, the secondary valve end of 2-2-4. cover,
2-3. secondary valve push rod,
2-4. filter core,
2-5. contain the filter core of accumulator rapid pipe joint seat, 2-5-1. accumulator rapid pipe joint seat,
3. electromagnetic priority valve,
4. check valve assembly,
4-1. banking stop, 4-2, unidirectional valve seat,
4-3. steel ball, 4-4. spring, 4-5. connecting sleeve.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is provided.
Embodiment 1
Shown in accompanying drawing, the present invention includes mechanical pilot valve 1, play the secondary valve 2 and the electromagnetic priority valve 3 of automatically controlled by-pass switch valve action, said secondary valve 2 is installed in the back side of mechanical pilot valve 1; Said electromagnetic priority valve 3 be installed in secondary valve 2 above; Said mechanical pilot valve 1 comprises valve body 1-1, valve seat 1-2, spool 1-3, spring spool 1-4 and voltage regulation screw 1-5, on said valve body 1-1, be processed with the valve body first fluid passage 1-1-1 that links up with auxiliary hole and the valve body second fluid passage 1-1-2 that links up with auxiliary hole and with the valve body intercommunicating pore 1-1-3 that comes liquid mouth 1-1-5 to be communicated with; Said secondary valve 2 comprises auxiliary valve body 2-1, plug-in mounting spool 2-2 and secondary valve push rod 2-3; Be processed with on the auxiliary valve body 2-1 with valve body 1-1 on valve body first fluid passage 1-1-1 and corresponding auxiliary valve body first fluid passage 2-1-1 and the auxiliary valve body second fluid passage 2-1-2 of the valve body second fluid passage 1-1-2; The auxiliary valve body intercommunicating pore 2-1-5 and the secondary valve push rod control hole 2-1-6 that on said auxiliary valve body 2-1, are processed with auxiliary valve body first main aperture 2-1-3 and the auxiliary valve body second main aperture 2-1-4 and are communicated with and are communicated with valve body intercommunicating pore 1-1-3 with the auxiliary valve body second main aperture 2-1-4 inner chamber; Plug-in mounting spool 2-2 and secondary valve push rod 2-3 are installed in the auxiliary valve body first main aperture 2-1-3; Said plug-in mounting spool 2-2 overlaps 2-2-1, auxiliary-seat 2-2-2, auxiliary valve core 2-2-3 and secondary valve end cover 2-2-4 by auxiliary-seat and forms, and filter core 2-4 is installed in the auxiliary valve body second main aperture 2-1-4.
On the basis of embodiment 1, the filter core 2-4 that will in the auxiliary valve body second main aperture 2-1-4, install is replaced by the filter core 2-5 that contains accumulator rapid pipe joint seat 2-5-1.
On the basis of embodiment 1 or embodiment 2; On said valve body 1-1, be processed with the valve body counterbore 1-1-4 that is communicated with valve body intercommunicating pore 1-1-3; On said auxiliary valve body 2-1, be processed with the auxiliary valve body counterbore 2-1-6 that is communicated with auxiliary valve body intercommunicating pore 2-1-5; Form the one-way valve inner chamber by said valve body counterbore 1-1-3 and auxiliary valve body counterbore 2-1-6; Check valve assembly 4 is installed in this one-way valve inner chamber, and said check valve assembly 4 comprises banking stop 4-1, unidirectional valve seat 4-2, steel ball 4-3, connecting sleeve 4-4 and spring 4-5.
High pressure liquid gets into valve body intercommunicating pore 1-1-3 through coming liquid mouth 1-1-5, gets into auxiliary valve body intercommunicating pore 2-1-5 again, and then gets into the auxiliary valve body second main aperture 2-1-4; And then through getting into the liquid entering hole of electromagnetic priority valve 3 after the filter core 2-4 filtration, when electromagnet was given electricity, the high pressure liquid of electromagnetic priority valve 3 liquid entering holes arrived secondary valve push rod control hole 2-1-6 through the working hole of electromagnetic priority valve; And then promote secondary valve push rod 2-3, auxiliary valve core 2-2-3 leaves auxiliary-seat 2-2-2, thereby feed pathway and back flow channel are communicated with, reach the purpose of off-load; When electromagnet cuts off the power supply, the electromagnetic priority valve liquid entering hole be cut off being communicated with of working hole of electromagnetic priority valve, simultaneously; The working hole of electromagnetic priority valve and the liquid return hole of electromagnetic priority valve are linked up; Cause the high pressure liquid of the secondary valve push rod 2-3 of control to efflux, and then make auxiliary valve core 2-2-3 and auxiliary-seat 2-2-2 closed from the liquid return hole of electromagnetic priority valve, thus cut-out feed pathway and back flow channel; Reach the purpose that stops off-load, recovered the function of feed flow.
Have in the present invention under the situation of one-way valve, working procedure is same as described above, and difference is when high pressure liquid is come liquid mouth 1-1-5 decompression, in the auxiliary valve body second main aperture 2-1-4 pressure is arranged still, can guarantee electromagnetic priority valve work; After the filter core 2-4 that in the auxiliary valve body second main aperture 2-1-4, installs is replaced by the filter core 2-5 that contains accumulator rapid pipe joint seat 2-5-1; When the auxiliary valve body second main aperture 2-1-4 internal pressure has leakage; Can be by external accumulator to the auxiliary valve body second main aperture 2-1-4 fluid infusion; Thereby guarantee that electromagnetic priority valve has enough pressure liquid to keep the off-load startup when primer pump, reach the purpose of No Load Start pump.
Claims (6)
1. dynamo-electric two control pilot valves that are used for unloading valve; The secondary valve (2) and the electromagnetic priority valve (3) that comprise mechanical pilot valve (1), an automatically controlled by-pass switch valve action; Said mechanical pilot valve (1) comprises valve body (1-1), valve seat (1-2), spool (1-3), spring spool (1-4) and voltage regulation screw (1-5); It is characterized in that, on said valve body (1-1), be processed with valve body first fluid passage (1-1-1) of linking up with auxiliary hole and valve body second fluid passage (1-1-2) of linking up with auxiliary hole and with the valve body intercommunicating pore (1-1-3) that comes liquid mouth (1-1-5) to be communicated with; Said secondary valve (2) comprises auxiliary valve body (2-1), plug-in mounting spool (2-2) and secondary valve push rod (2-3); Be processed with on the auxiliary valve body (2-1) with valve body (1-1) on valve body first fluid passage (1-1-1) and corresponding auxiliary valve body first fluid passage (2-1-1) and auxiliary valve body second fluid passage (2-1-2) of valve body second fluid passage (1-1-2); The auxiliary valve body intercommunicating pore (2-1-5) that on said auxiliary valve body (2-1), is processed with auxiliary valve body first main aperture (2-1-3) and auxiliary valve body second main aperture (2-1-4) and is communicated with and is communicated with valve body intercommunicating pore (1-1-3) with auxiliary valve body second main aperture (2-1-4) inner chamber; Plug-in mounting spool (2-2) and secondary valve push rod (2-3) are installed, installation filter core (2-4) or contain the filter core (2-5) of accumulator rapid pipe joint seat (2-5-1) in auxiliary valve body second main aperture (2-1-4) in auxiliary valve body first main aperture (2-1-3).
2. according to the said a kind of dynamo-electric two control pilot valves that are used for unloading valve of claim 1; It is characterized in that; On said valve body (1-1), be processed with the valve body counterbore (1-1-4) that is communicated with valve body intercommunicating pore (1-1-3); On said auxiliary valve body (2-1), be processed with the auxiliary valve body counterbore (2-1-6) that is communicated with auxiliary valve body intercommunicating pore (2-1-5), form the one-way valve inner chamber, check valve assembly (4) is installed in this one-way valve inner chamber by said valve body counterbore (1-1-3) and auxiliary valve body counterbore (2-1-6).
3. according to the said a kind of dynamo-electric two control pilot valves that are used for unloading valve of claim 1, it is characterized in that said plug-in mounting spool (2-2) is made up of auxiliary-seat cover (2-2-1), auxiliary-seat (2-2-2), auxiliary valve core (2-2-3) and secondary valve end cover (2-2-4).
4. according to the said a kind of dynamo-electric two control pilot valves that are used for unloading valve of claim 2, it is characterized in that said check valve assembly (4) comprises banking stop (4-1), unidirectional valve seat (4-2), steel ball (4-3), connecting sleeve (4-4) and spring (4-5).
5. according to claim 1 or the said a kind of dynamo-electric two control pilot valves that are used for unloading valve of claim 2, it is characterized in that said secondary valve (2) is installed in the back side of mechanical pilot valve (1).
6. according to the said a kind of dynamo-electric two control pilot valves that are used for unloading valve of claim 1 or claim 2, it is characterized in that, said electromagnetic priority valve (3) be installed in secondary valve (2) above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245380.6A CN102777663B (en) | 2012-07-13 | 2012-07-13 | Electro-mechanical dual control pilot valve for unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245380.6A CN102777663B (en) | 2012-07-13 | 2012-07-13 | Electro-mechanical dual control pilot valve for unloading valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102777663A true CN102777663A (en) | 2012-11-14 |
| CN102777663B CN102777663B (en) | 2014-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210245380.6A Active CN102777663B (en) | 2012-07-13 | 2012-07-13 | Electro-mechanical dual control pilot valve for unloading valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN102777663B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989690A (en) * | 2015-06-29 | 2015-10-21 | 象山盛韵汽配科技有限公司 | Overload relief valve |
| CN112324972A (en) * | 2019-08-05 | 2021-02-05 | 伊希欧1控股有限公司 | Actuator for hydraulic valve and hydraulic valve |
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| CN2906159Y (en) * | 2006-02-11 | 2007-05-30 | 中国矿业大学 | Electrohydraulic unloading valve with hydraulic control and electrohydraulic control operation modes |
| JP4162278B2 (en) * | 1997-07-29 | 2008-10-08 | 豊興工業株式会社 | Hydraulic control valve |
| CN101749255A (en) * | 2010-01-14 | 2010-06-23 | 北京天地玛珂电液控制系统有限公司 | Pilot valve of pump unloading valve |
| CN101761470A (en) * | 2010-01-14 | 2010-06-30 | 北京天地玛珂电液控制系统有限公司 | Closing-storing and unloading control valve for sudden-stop of bump |
| CN201671900U (en) * | 2010-05-19 | 2010-12-15 | 煤炭科学研究总院太原研究院 | Electromagnetic unloading valve of emulsion pump station |
| CN202674472U (en) * | 2012-07-13 | 2013-01-16 | 北京天地玛珂电液控制系统有限公司 | Mechanically and electrically controlled pilot valve for unloading valve |
-
2012
- 2012-07-13 CN CN201210245380.6A patent/CN102777663B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743345A1 (en) * | 1987-12-21 | 1989-06-29 | Bosch Gmbh Robert | Proportionally working pressure relief valve |
| CN1039288A (en) * | 1989-07-24 | 1990-01-31 | 权宇 | Composite control valve of pressure and flow proportional to electric current |
| JP4162278B2 (en) * | 1997-07-29 | 2008-10-08 | 豊興工業株式会社 | Hydraulic control valve |
| CN1424514A (en) * | 2003-01-02 | 2003-06-18 | 宁波华液机器制造有限公司 | Differential pressure type proportional pressure and flow composite valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989690A (en) * | 2015-06-29 | 2015-10-21 | 象山盛韵汽配科技有限公司 | Overload relief valve |
| CN112324972A (en) * | 2019-08-05 | 2021-02-05 | 伊希欧1控股有限公司 | Actuator for hydraulic valve and hydraulic valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102777663B (en) | 2014-09-24 |
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Effective date of registration: 20171117 Address after: 100013, Beijing, Hepingli, Chaoyang District Youth ditch East Road, No. 5 World Building, Beijing Tiandi electric hydraulic control system Co., Ltd. Co-patentee after: BEIJING CCRI-TIANMA AUTOMATION TECHNOLOGY Co.,Ltd. Patentee after: BEIJING TIANDI-MARCO ELECTRO-HYDRAULIC CONTROL SYSTEM Co.,Ltd. Address before: 100013 Beijing, Hepingli Youth ditch East Road, No. 5, building a layer of heaven and earth Patentee before: BEIJING TIANDI-MARCO ELECTRO-HYDRAULIC CONTROL SYSTEM Co.,Ltd. |
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Address after: Beijing Tiandi Marco Electro-hydraulic Control System Co., Ltd., Tiandi building, No. 5 qingniangou East Road, Hepingli, Chaoyang District, Beijing 100013 Patentee after: CCTEG Beijing Tianma Intelligent Control Technology Co.,Ltd. Patentee after: BEIJING CCRI-TIANMA AUTOMATION TECHNOLOGY Co.,Ltd. Address before: Beijing Tiandi Marco Electro-hydraulic Control System Co., Ltd., Tiandi building, No. 5 qingniangou East Road, Hepingli, Chaoyang District, Beijing 100013 Patentee before: BEIJING TIANDI-MARCO ELECTRO-HYDRAULIC CONTROL SYSTEM Co.,Ltd. Patentee before: BEIJING CCRI-TIANMA AUTOMATION TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |