CN102501401B - Molding pressure control system for hydraulic molding machine and control method thereof - Google Patents
Molding pressure control system for hydraulic molding machine and control method thereof Download PDFInfo
- Publication number
- CN102501401B CN102501401B CN201110334288.2A CN201110334288A CN102501401B CN 102501401 B CN102501401 B CN 102501401B CN 201110334288 A CN201110334288 A CN 201110334288A CN 102501401 B CN102501401 B CN 102501401B
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve
- electromagnetic switch
- oil
- constant output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
Provided are a molding pressure control system for a hydraulic molding machine and a control method thereof. The molding pressure control system for the hydraulic molding machine comprises a controller and a hydraulic system, wherein an outlet of a low-pressure variable-quantity constant output pump in the hydraulic system is connected with a safety valve I through a hydraulic pipeline, the safety valve I is connected with an oil inlet of a check valve I through a hydraulic oil way, one way of the oil outlet of the check valve I is connected with an accumulator, and the other way of the oil outlet of the check valve I is connected with an oil inlet of a check valve II. An outlet of a high-pressure variable-quantity constant output pump is connected with a safety valve II through a hydraulic pipeline, the safety valve II is connected with an oil inlet of a check electromagnetic switch valve through a hydraulic oil way, an oil outlet of the check electromagnetic switch valve is connected with an oil outlet of the check valve II, one way of the oil outlet of the check electromagnetic switch valve is connected with a pressing circuit, and the other way of the oil outlet of the check electromagnetic switch valve is connected with the accumulator through an electromagnetic switch control valve. The constant power variable quantity pump is used for directly pressurizing to molding pressure. The molding pressure control method is simple, high in repeated accuracy, quick in response, high in reliability and capable of obviously improving molding quality of raw bricks, simplifying hydraulic circuits and enabling the method to be simple and reliable.
Description
Technical field
The present invention relates to great tonnage hydraulic forming machine, particularly briquetting pressure control system and the control method of wall body brick hydraulic forming machine, for accurately controlling wall body brick hydraulic forming machine green brick forming pressure.
Technical background
In recent years along with going deep into that materials for wall is reformed, environment-friendly energy-saving wall body brick particularly fly ash wall body brick is widely used, the crucial former of making as flyash brick: hydraulic forming machine plays a decisive role in green brick forming Quality Process is controlled.The important parameter of stipulating in wall body brick GB: fluctuation range is larger always for the appearance and size of wall body brick and the compression strength of wall body brick, its large main cause that fluctuates has: it is large that cloth is uneven, briquetting pressure fluctuates up and down etc., prior art is improved not quite solving into brick pressure oscillation broad aspect always, brings no small adverse effect to applying of flyash.
In the hydraulic forming machine of current domestic use, become the control of brick pressure to adopt time control act more: i.e. adobe low pressure molding and in the molded stage with time length, control low pressure molding pressure and in molded pressure, in molded end adopt afterwards the mode of pressurized cylinder supercharging to complete high pressure to suppress.This control mode is owing to being subject to temperature, oil viscosity, fluid elastic modelling quantity, material elastic modelling quantity, the many factors such as cloth difference, low pressure and in to be pressed into brick pressure oscillation larger, repeatable accuracy is poor, in high pressure when compacting, is owing to adopting pressurized cylinder supercharging, supercharging is compressed on moment and completes, the fluid moment that is about to pressurized cylinder rod chamber is filled into compacting main piston and exerts pressure in chamber, cause compacting main piston cavity volume change in volume, final pressure is at fluid elastic modelling quantity, material elastic modelling quantity, under the common participation of the change in volume of material, form, during due to each supercharging, material elastic modelling quantity and volume change differ greatly, finally cause high-pressure molding pressure oscillation, and because pressurization completed in moment, the high pressure pressing stage time is too short, gas in adobe cannot be discharged and be caused occurring the mass defects such as aliquation after the adobe demoulding.
The diversity of hydraulic variable displacement pump Variable Control mode provides more multipath for solving the deficiency of above-mentioned control mode, variable displacement with constant power pump possesses the function that low pressure and mass flow and high-pressure low-flow are provided simultaneously, and the pressure cutoff function that variable displacement with constant power pump carries can allow, and cutoff pressure repeatable accuracy is high, response is rapid, reliability is high, and " hyperbola pressure flow characteristics auto " that its output flow reduces automatically with pressure rising can be good at being applied to flyash brick forming machine.
Summary of the invention
To be solved by this inventionly be that flyash brick hydraulic forming machine green brick forming pressure repeatable accuracy is poor, poor reliability and the flyash brick apparent size causing, the problem that resistance to compression pressure oscillation is large, and a kind of hydraulic forming machine briquetting pressure control system and control method are proposed.
The present invention solves the problems of the technologies described above adopted technical scheme to be: a kind of hydraulic forming machine briquetting pressure control system, comprise controller and hydraulic system, hydraulic system comprises high pressure variable constant output pump, low pressure variable amount constant output pump and accumulator, the outlet of low pressure variable amount constant output pump is connected with safety valve I by fluid pressure line, safety valve I is connected to the oil-in of check valve I by hydraulic circuit, the oil-out of check valve I is divided into two-way, one road is connected to accumulator, and another road is connected to the oil-in of check valve II; The outlet of high pressure variable constant output pump is connected with safety valve II by fluid pressure line, safety valve II is connected to the oil-in of unidirectional electromagnetic switch valve by hydraulic circuit, the oil-out of the oil-out of unidirectional electromagnetic switch valve and check valve II and connect after be divided into two-way, one road is connected to compacting loop, and the electromagnetic switch control valve of separately leading up to is connected with accumulator; The oil-out of unidirectional electromagnetic switch valve is connected with pressure sensor by pressure measurement flexible pipe, between accumulator and electromagnetic switch control valve, by hydraulic circuit, is connected with pressure switch.
The oil-out of described check valve I is also connected with demoulding loop.
The signal output part of described pressure sensor and pressure switch is connected with the control end of electromagnetic switch control valve.
The compress control method of hydraulic forming machine briquetting pressure control system, by controller, control the break-make of unidirectional electromagnetic switch valve and electromagnetic switch control valve, by high pressure variable constant output pump, control briquetting pressure, briquetting pressure equals the cutoff pressure of high pressure variable constant output pump, pressing process comprises low, middle pressure compacting and high pressure compacting
During low, middle pressure compacting, electromagnetic switch control valve is opened, and acting in conjunction after the hydraulic oil of low pressure variable amount constant output pump and the output of high pressure variable constant output pump confluxes, simultaneously to compacting loop and accumulator fuel feeding;
During high pressure compacting, electromagnetic switch control valve is closed, the pressure of check valve II oil-out is greater than the pressure of oil-in, path between check valve II automatic cutoff low variable constant output pump and compacting loop, low pressure variable amount constant output pump is to accumulator fuel feeding, and high pressure variable constant output pump is separately to compacting loop fuel feeding;
In pressing process, pressure sensor detects briquetting pressure, when briquetting pressure being detected higher than the cutoff pressure of high pressure variable constant output pump, controls unidirectional electromagnetic switch valve and closes; Pressure switch detects energy storage pressure, when energy storage pressure being detected and be greater than the cutoff pressure of low pressure variable amount constant output pump, controls electromagnetic switch control valve and unidirectional electromagnetic switch valve and closes.
Compacting finishes the rear earth pressure release stage and can to accumulator, recover energy by electromagnetic switch control valve.
The invention has the beneficial effects as follows: by controller, control the break-make of unidirectional electromagnetic switch valve and electromagnetic switch control valve, according to setting program, automatically switching, low, middle pressure is suppressed and high pressure compacting.Pressure sensor and pressure switch play a protective role, and automatically cut off oil circuit when pressure surpasses predetermined value.Adopt variable displacement with constant power pump direct weighting to briquetting pressure, briquetting pressure control method is simple, repeatable accuracy is high, response is rapid, reliability is high, has significantly improved green brick forming quality.Simplified hydraulic circuit, using method is simple and reliable.
Accompanying drawing explanation
Fig. 1 is hydraulic system principle figure of the present invention.
Mark in figure: 1, high pressure variable constant output pump, 2, low pressure variable amount constant output pump, 3, safety valve II; 4, safety valve I; 5, unidirectional electromagnetic switch valve, 6, check valve I, 7, pressure sensor; 8, check valve II; 9, electromagnetic switch control valve, 10, pressure switch, 11, accumulator; 12, compacting loop, 13, demoulding loop.
The specific embodiment
As shown in the figure, a kind of hydraulic forming machine briquetting pressure control system, comprise controller and hydraulic system, hydraulic system comprises high pressure variable constant output pump 1, low pressure variable amount constant output pump 2 and accumulator 11, the outlet of low pressure variable amount constant output pump 2 is connected with safety valve I 4 by fluid pressure line, and safety valve I 4 is connected to the oil-in of check valve I 6 by hydraulic circuit, and the oil-out of check valve I 6 is divided into two-way, one road is connected to accumulator 11, and another road is connected to the oil-in of check valve II 8; The outlet of high pressure variable constant output pump 1 is connected with safety valve II 3 by fluid pressure line, safety valve II 3 is connected to the oil-in of unidirectional electromagnetic switch valve 5 by hydraulic circuit, the oil-out of the oil-out of unidirectional electromagnetic switch valve 5 and check valve II 8 and connect after be divided into two-way, one road is connected to compacting loop 12, and the electromagnetic switch control valve 9 of separately leading up to is connected with accumulator 11; The oil-out of unidirectional electromagnetic switch valve 5 is connected with pressure sensor 7 by pressure measurement flexible pipe, between accumulator 11 and electromagnetic switch control valve 9, by hydraulic circuit, is connected with pressure switch 10.
The oil-out of described check valve I 6 is also connected with demoulding loop 13.
The signal output part of described pressure sensor 7 and pressure switch 10 is connected with the control end of electromagnetic switch control valve 9.
High pressure variable constant output pump 1 is controlled by electromagnetic switch control valve 9 with the break-make of accumulator 11 oil circuits, and high pressure variable constant output pump 1 is batch (-type) fuel feeding to accumulator 11.Low pressure variable amount constant output pump 2 is directly connected with accumulator 11, and low pressure variable amount constant output pump 2 continues fuel feeding to accumulator 11.The cutoff pressure of high pressure variable constant output pump 1 and low pressure variable amount constant output pump 2 is adjustable.Electromagnetic switch control valve 9 is normally closed function, and unidirectional electromagnetic switch valve 5 is normal start energy.
The compress control method of hydraulic forming machine briquetting pressure control system is, by controller, control the break-make of unidirectional electromagnetic switch valve 5 and electromagnetic switch control valve 9, by high pressure variable constant output pump 1, control briquetting pressure, briquetting pressure equals the cutoff pressure of high pressure variable constant output pump 1, pressing process comprises low, middle pressure compacting and high pressure compacting;
During low, middle pressure compacting, electromagnetic switch control valve 9 is opened, and acting in conjunction after the hydraulic oil of low pressure variable amount constant output pump 2 and 1 output of high pressure variable constant output pump confluxes, simultaneously to compacting loop 12 and accumulator 11 fuel feeding;
During high pressure compacting, electromagnetic switch control valve 9 is closed, the pressure of check valve II 8 oil-outs is greater than the pressure of oil-in, path between the automatic cutoff low variable constant output pump 2 of check valve II 8 and compacting loop 12, low pressure variable amount constant output pump 2 is to accumulator 11 fuel feeding, and high pressure variable constant output pump 1 is separately to compacting loop 12 fuel feeding;
In pressing process, pressure sensor 7 and pressure switch 10 play a protective role, and pressure sensor 7 detects briquetting pressures, when briquetting pressure being detected higher than the cutoff pressure of high pressure variable constant output pump 1, control unidirectional electromagnetic switch valve 5 and close; Pressure switch 10 detects accumulator 11 pressure, when accumulator 11 pressure being detected and be greater than the cutoff pressure of low pressure variable amount constant output pump 2, controls electromagnetic switch control valve 9 and unidirectional electromagnetic switch valve 5 and closes.
Compacting finishes the rear earth pressure release stage and can to accumulator 11, recover energy by electromagnetic switch control valve 9.
As shown in the figure, when low pressure compacting and the compacting of middle pressure, unidirectional electromagnetic switch valve 5 is opened, high pressure variable constant output pump 1 passes through unidirectional electromagnetic switch valve 5 directly to compacting loop 12 fuel feeding, low pressure variable amount constant output pump 2 output fluid are by check valve II 8 and high pressure variable constant output pump 1 output fluid backward compacting loop 12 fuel feeding that conflux, electromagnetic switch control valve 9 is opened, and accumulator 11 is communicated with compacting loop 12, as auxiliary power source to suppressing loop 12 fuel feeding, controller is according to the program of setting, complete after low pressure compacting and the compacting of middle pressure, controlling electromagnetic switch control valve 9 closes, start to carry out high pressure pressing process, while carrying out high pressure compacting action, low pressure variable amount constant output pump 2 continues output low-pressure hydraulic oil, to accumulator 11 topping ups, high pressure variable constant output pump 1 is output high pressure liquid force feed automatically, directly transfer to compacting loop 12, high pressure liquid force feed is exported to such an extent that low-pressure hydraulic oil cuts off automatically by check valve II 8 and low pressure variable amount constant output pump 2, electromagnetic switch control valve 9 is closed, the hydraulic oil of cutoff high variable constant output pump 1 output and the oil circuit of accumulator 11, compacting loop 12 oil pressure continue to raise under the effect of high pressure variable constant output pump 1, until reach the setting value of its high-pressure stop pressure, the 1 high-pressure stop off-load of high pressure variable constant output pump.Pressure switch 10 and pressure sensor 7 are as protecting component; by pressure switch 10 and pressure sensor 7, detected the pressure of present position; when point pressure of living in being detected over its setting value, controlling unidirectional electrical magnetic switch valve 5 closes; cutoff high variable constant output pump 1 outlet oil circuit; the 1 high-pressure stop off-load of cutoff high variable constant output pump, completes high pressure pressing function.
Claims (6)
1. a hydraulic forming machine briquetting pressure control system, comprise controller and hydraulic system, it is characterized in that: hydraulic system comprises high pressure variable constant output pump (1), low pressure variable amount constant output pump (2) and accumulator (11), the outlet of low pressure variable amount constant output pump (2) is connected with safety valve I (4) by fluid pressure line, safety valve I (4) is connected to the oil-in of check valve I (6) by hydraulic circuit, the oil-out of check valve I (6) is divided into two-way, one road is connected to accumulator (11), and another road is connected to the oil-in of check valve II (8); The outlet of high pressure variable constant output pump (1) is connected with safety valve II (3) by fluid pressure line, safety valve II (3) is connected to the oil-in of unidirectional electromagnetic switch valve (5) by hydraulic circuit, the oil-out of the oil-out of unidirectional electromagnetic switch valve (5) and check valve II (8) and connect after be divided into two-way, one road is connected to compacting loop (12), and the electromagnetic switch control valve (9) of separately leading up to is connected with accumulator (11); The oil-out of unidirectional electromagnetic switch valve (5) is connected with pressure sensor (7) by pressure measurement flexible pipe, between accumulator (11) and electromagnetic switch control valve (9), by hydraulic circuit, is connected with pressure switch (10).
2. a kind of hydraulic forming machine briquetting pressure control system as claimed in claim 1, is characterized in that: the oil-out of described check valve I (6) is also connected with demoulding loop (13).
3. a kind of hydraulic forming machine briquetting pressure control system as claimed in claim 1, is characterized in that: the signal output part of described pressure sensor (7) and pressure switch (10) is connected with the control end of electromagnetic switch control valve (9).
4. the compress control method of a hydraulic forming machine briquetting pressure control system, it is characterized in that: the break-make of controlling unidirectional electromagnetic switch valve (5) and electromagnetic switch control valve (9) by controller, by high pressure variable constant output pump (1), control briquetting pressure, briquetting pressure equals the cutoff pressure of high pressure variable constant output pump (1), pressing process comprises low, middle pressure compacting and high pressure compacting
During low, middle pressure compacting, electromagnetic switch control valve (9) is opened, and acting in conjunction after the hydraulic oil of low pressure variable amount constant output pump (2) and high pressure variable constant output pump (1) output confluxes, simultaneously to compacting loop (12) and accumulator (11) fuel feeding;
During high pressure compacting, electromagnetic switch control valve (9) is closed, the pressure of check valve II (8) oil-out is greater than the pressure of oil-in, path between the automatic cutoff low variable constant output pump (2) of check valve II (8) and compacting loop (12), low pressure variable amount constant output pump (2) is to accumulator (11) fuel feeding, and high pressure variable constant output pump (1) is separately to compacting loop (12) fuel feeding.
5. the compress control method of a kind of hydraulic forming machine briquetting pressure control system as claimed in claim 4, it is characterized in that: in pressing process, pressure sensor (7) detects briquetting pressure, when briquetting pressure being detected higher than the cutoff pressure of high pressure variable constant output pump (1), control unidirectional electromagnetic switch valve (5) and close; Pressure switch (10) detects accumulator (11) pressure, when accumulator (11) pressure being detected and be greater than the cutoff pressure of low pressure variable amount constant output pump (2), controls electromagnetic switch control valve (9) and unidirectional electromagnetic switch valve (5) and closes.
6. the compress control method of a kind of hydraulic forming machine briquetting pressure control system as claimed in claim 4, is characterized in that: compacting finishes the rear earth pressure release stage and recovers energy to accumulator (11) by electromagnetic switch control valve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110334288.2A CN102501401B (en) | 2011-10-29 | 2011-10-29 | Molding pressure control system for hydraulic molding machine and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110334288.2A CN102501401B (en) | 2011-10-29 | 2011-10-29 | Molding pressure control system for hydraulic molding machine and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102501401A CN102501401A (en) | 2012-06-20 |
| CN102501401B true CN102501401B (en) | 2014-04-09 |
Family
ID=46213563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110334288.2A Active CN102501401B (en) | 2011-10-29 | 2011-10-29 | Molding pressure control system for hydraulic molding machine and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102501401B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110315630A (en) * | 2019-05-06 | 2019-10-11 | 西安银马实业发展有限公司 | A kind of application of hydraulic press sensor in hydrostatic profile |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158723A (en) * | 1988-06-10 | 1992-10-27 | Ulrico Walchhutter | Method and apparatus for hydraulic pressing |
| CN2146359Y (en) * | 1992-09-28 | 1993-11-17 | 机械电子工业部北京机电研究所 | Superplastic forming hydraulic press |
| EP1213174A1 (en) * | 2000-12-08 | 2002-06-12 | Brueninghaus Hydromatik Gmbh | Rotational speed control device and method of controlling an output rotational speed of a hydrostatic drive |
| CN2633546Y (en) * | 2003-07-23 | 2004-08-18 | 上海华岛液压设备制造有限公司 | Hydraulic controller for floor brick press |
| CN200947075Y (en) * | 2006-07-11 | 2007-09-12 | 谢永杰 | Multifunctional hydraulic testing machine |
| CN201026645Y (en) * | 2007-03-30 | 2008-02-27 | 付炳方 | Forming machine for concrete member |
| CN101531028A (en) * | 2009-03-02 | 2009-09-16 | 宁波职业技术学院 | A concrete block molding machine hydraulic system |
| CN201645606U (en) * | 2010-04-19 | 2010-11-24 | 天津欧陆重工机械制造有限公司 | Hydraulic control system of full-automatic flyash tile press |
| CN202344888U (en) * | 2011-10-29 | 2012-07-25 | 洛阳中冶重工机械有限公司 | Moulding pressure control system for hydraulic moulding machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001287099A (en) * | 2000-03-30 | 2001-10-16 | Hitachi Chem Co Ltd | Method and apparatus for parallel control of hydraulic press |
| JP2003166501A (en) * | 2001-11-28 | 2003-06-13 | Meiki Co Ltd | Compression force control method of press |
| JP2004308736A (en) * | 2003-04-04 | 2004-11-04 | Ebara Corp | Hydraulic device and its control method |
-
2011
- 2011-10-29 CN CN201110334288.2A patent/CN102501401B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158723A (en) * | 1988-06-10 | 1992-10-27 | Ulrico Walchhutter | Method and apparatus for hydraulic pressing |
| CN2146359Y (en) * | 1992-09-28 | 1993-11-17 | 机械电子工业部北京机电研究所 | Superplastic forming hydraulic press |
| EP1213174A1 (en) * | 2000-12-08 | 2002-06-12 | Brueninghaus Hydromatik Gmbh | Rotational speed control device and method of controlling an output rotational speed of a hydrostatic drive |
| CN2633546Y (en) * | 2003-07-23 | 2004-08-18 | 上海华岛液压设备制造有限公司 | Hydraulic controller for floor brick press |
| CN200947075Y (en) * | 2006-07-11 | 2007-09-12 | 谢永杰 | Multifunctional hydraulic testing machine |
| CN201026645Y (en) * | 2007-03-30 | 2008-02-27 | 付炳方 | Forming machine for concrete member |
| CN101531028A (en) * | 2009-03-02 | 2009-09-16 | 宁波职业技术学院 | A concrete block molding machine hydraulic system |
| CN201645606U (en) * | 2010-04-19 | 2010-11-24 | 天津欧陆重工机械制造有限公司 | Hydraulic control system of full-automatic flyash tile press |
| CN202344888U (en) * | 2011-10-29 | 2012-07-25 | 洛阳中冶重工机械有限公司 | Moulding pressure control system for hydraulic moulding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102501401A (en) | 2012-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202023797U (en) | Pumping mechanism and pulse vibration absorption device thereof, and concrete pumping machine | |
| CN204476884U (en) | A kind of hydraulic system of polyurethane handrail joint moulding press | |
| CN105150356A (en) | Hydraulic control system for brick machine and fully-automatic bidirectionally-pressing hydraulic control method of hydraulic control system | |
| CN201665025U (en) | Stepless adjustable constant pressure control oil-way system for upper hydraulic cushion of hydraulic press | |
| CN110864021B (en) | Synchronous control system for hydraulic oil cylinder of cubic press | |
| CN202344888U (en) | Moulding pressure control system for hydraulic moulding machine | |
| CN101768990A (en) | Hydraulic constant power control device for excavator | |
| CN102501401B (en) | Molding pressure control system for hydraulic molding machine and control method thereof | |
| CN207028120U (en) | Fervent hydraulic control system in a kind of high pressing mold | |
| CN110871591A (en) | High-speed forming press control system | |
| CN202194873U (en) | Servo pressure maintaining and speed regulation hydraulic circuit | |
| CN201776935U (en) | Hydraulic machine with two sets of hydraulic system structures | |
| CN203655732U (en) | Grading machine and double-roller control system thereof | |
| CN210599612U (en) | Continuous impact pressurization system for double-pump oil supply | |
| CN210240183U (en) | Energy-saving ultrahigh-pressure pulse test bed for electromagnetic directional valve | |
| CN201036810Y (en) | Magnetic material wet-pressing forming material filling system | |
| CN210758388U (en) | High-pressure forming slurry curve pressurizing device | |
| CN202091297U (en) | Hydraulic constant pressure control system of calender | |
| CN202934827U (en) | Hydraulic oil press | |
| CN104564630B (en) | Digital intelligent color paste pump | |
| CN108644163A (en) | A kind of garbage truck scrapes slide plate cycle operation hydraulic system | |
| CN110370443B (en) | High-pressure forming slurry curve pressurizing device and method | |
| CN203344276U (en) | Novel direct-pressure mold clamping oil line formed through compressive injection molding | |
| CN210343905U (en) | Hydraulic system of double-layer conveying belt flat vulcanizing machine and flat vulcanizing machine | |
| CN201539396U (en) | Water pump pressure controller with adjustable starting pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 471003 Qinling Mountains South Road, Jianxi District, Luoyang, Henan Patentee after: LUOYANG ZHONGYE HEAVY INDUSTRY MACHINERY CO.,LTD. Address before: 471003 Qinling Mountains South Road, Jianxi District, Luoyang, Henan Patentee before: LUOYANG ZHONGYE HEAVY INDUSTRY MACHINERY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230817 Address after: Building 3 of MCC Heavy Industry, No. 369 Qinling Road, Jianxi District, Luoyang City, Henan Province, 471000 Patentee after: Luoyang Tengheda Intelligent Equipment Co.,Ltd. Address before: 471003 Qinling Mountains South Road, Jianxi District, Luoyang, Henan Patentee before: LUOYANG ZHONGYE HEAVY INDUSTRY MACHINERY CO.,LTD. |
|
| TR01 | Transfer of patent right |