CN202097266U - Electric hydraulic control device of numerical control flat punching machine - Google Patents
Electric hydraulic control device of numerical control flat punching machine Download PDFInfo
- Publication number
- CN202097266U CN202097266U CN2011201377469U CN201120137746U CN202097266U CN 202097266 U CN202097266 U CN 202097266U CN 2011201377469 U CN2011201377469 U CN 2011201377469U CN 201120137746 U CN201120137746 U CN 201120137746U CN 202097266 U CN202097266 U CN 202097266U
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve
- pump
- control device
- low
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model relates to an electric hydraulic control device of a numerical control flat punching machine. The utility model is characterized in that the electric hydraulic control device comprises a high-low pressure double pump, an electric hydraulic servo valve or a high frequency response proportional valve and a differential speed-increasing circuit, wherein the high-low pressure double pump consists of a high-pressure pump and a low-pressure pump, the differential speed-increasing circuit consists of a hydraulic changeover valve and a hydraulic cylinder. The electric hydraulic control device adopts the high-low pressure double pump. The rapid movement and the punching action of the hydraulic cylinder are realized through the alternative use of the high-pressure pump and the low-pressure pump in the high-low pressure double pump; due to the differential connection, the working efficiency is improved, and the energy is saved; with the adoption of the electric hydraulic servo valve or the high frequency response proportional valve, rapid changeover can be realized.
Description
Technical field
The utility model electrofluidic control device is used for the dull and stereotyped perforating press of numerical control, and the dull and stereotyped perforating press of numerical control is high accuracy in a kind of automobile industry, high efficiency cut deal material process equipment, is mainly used in the processing of punching operations such as vehicle beam, connecting plate.
Background technology
The high speed stamping technology is one of stress metal processing method that is widely used at present, and it has characteristics such as efficient height, energy are economized, cost is low.Development along with sophisticated industries such as Domestic Automotive Industry, electronic technology and space flight and aviation; The domestic market is increasing to the demand of the dull and stereotyped perforating press of numerical control; At present; Dull and stereotyped its electrofluidic control device of perforating press of the numerical control that China produces mainly contains two types: (1) import electrofluidic control device, and technology maturation, but cost is higher; (2) homemade electrofluidic control device, cost is lower, but there are problems such as unstable properties, fault rate height in hydraulic system.
The dull and stereotyped perforating press of numerical control mainly carries out punching processing to sheet material, and its operation cycle is: descending fast-deceleration punching press-fast return-original position stop.In the punching course, require slide block to descend with fast speeds, during near sheet material, drift speed reduces, and guarantees the flexible punching press to steel plate.Punching press finishes, the drift fast rise.Matching used hydraulic pressure Electrical Control Technology characteristics are: adopt linear displacement transducer, hydraulic cylinder is carried out that linear displacement detects and combines with hydraulic control card, hydraulic pressure valve control system, digital control system the oil cylinder displacement carried out controlling.
The dull and stereotyped perforating press instructions for use of present domestic numerical control: the oil cylinder knee-action is accomplished the punching action to the automobile industry cut deal; Operating pressure reaches 28MPa, and blanking power reaches 810KN; The punching frequency is high, reaches 100～120 times/min.Mainly there is following problem in homemade hydraulic system: (1) punching press number of times does not reach 100 times/min.(2) impact greatly, pump is fragile.(3) fluid heating phenomenon is serious.
Summary of the invention
To the present situation of the dull and stereotyped perforating press electro-hydraulic device of numerical control, the utility model proposes a solution, and is as shown in Figure 1, and this scheme can solve homemade system existing problems, and performance is superior to inlet system, and cost is low, and price is about 1/2 of inlet system.
This programme is realized through following technical measures: the dull and stereotyped perforating press electrofluidic control device of a kind of numerical control; It is characterized in that it comprises the high-low pressure duplex pump of being made up of high-pressure pump and low-lift pump; Electrohydraulic servo valve or high frequency sound proportioning valve, the differential type speed accelerating circuits that hydraulicchange-over valve and hydraulic cylinder are formed.
The concrete characteristics of this programme also have; Parallel connection is provided with the first pressure regulation unloader group on the pipeline between first check valve of high-pressure pump oil-out and series connection with it, and parallel connection is provided with the second pressure regulation unloader group on the pipeline between second check valve of low-lift pump oil-out and series connection with it.Pressure regulation unloader group comprises Z2D plug-in unit, the F22 cover plate that two-position four-way solenoid directional control valve and Ji'nan Foundry & Metalforming Machinery Research Institute Co., Ltd. produce.High-pressure pump pressure regulation off-load is accomplished by pressure regulation unloader group, when system pressure reaches setting value, and digital display pressure inverting controller sender, the solenoid directional control valve dead electricity in the pressure regulation unloader group, high-pressure pump off-load.When magnetic valve gets when electric, come initialization system pressure through the handwheel of regulating pressure regulation unloader group.Low-lift pump pressure regulation off-load is accomplished by pressure regulation unloader group.
Parallel connection is provided with the 3rd accumulator on oil return line, and vibration is eliminated in hydraulic shock that can absorption system, can also improve the stability of system simultaneously.Parallel connection is provided with first accumulator and accumulator safety valve group loop and Pressure gauge and digital display pressure inverting controller behind differential type speed accelerating circuits first check valve; Accumulator can improve flow system flow where necessary as auxiliary power source, and then improves the movement velocity of executive component, can also reduce noise simultaneously, absorbs and impacts, and reduces vibration.When accumulator safety valve group is convenient to system overhaul, discharge the pressure oil in the accumulator.
Parallel connection is provided with second accumulator between hydraulic cylinder and the hydraulicchange-over valve in the differential type speed accelerating circuits.When the hydraulic cylinder backhaul, the high-low pressure duplex pump and second accumulator are realized the quick return of hydraulic cylinder simultaneously to hydraulic cylinder cavity of resorption fuel feeding.On oil return line, be in series with cooler and oil return oil filter.
The beneficial effect of this programme is:
(1) adopts electrohydraulic servo valve or high frequency sound proportioning valve, can realize quick switching-over.
Electrohydraulic servo valve is the multistage servoelement that electric liquid jointly controls, and it zooms into the output of large-power hydraulic energy with faint electrical input signal.Electrohydraulic servo valve has advantages such as response is fast, and control accuracy is high, and it is reliable to operate steadily.This programme adopts the HY150 electrohydraulic servo valve of the dynamo-electric hydraulic pressure application technology of Xiangfan space flight Co., Ltd; HY series electrohydraulic servo valve is a kind of high performance flow control valve, advantage such as have compact conformation, stable and reliable working performance, dynamic response is high, flow is big, volume is little.
Adopt the special-purpose high frequency sound proportioning valve of atos punching press DKZOR series in the scheme.High frequency sound proportioning valve response frequency is high, performance is good, is particularly suitable in the control loop of high dynamic characteristic.
(2) adopt differential connection, greatly improved the movement velocity in the hydraulic cylinder decline process, practiced thrift the time, improved efficient.Atos hydraulicchange-over valve DK-1 series is used in differential connection, and working pressure reaches 31.5MPa, satisfies instructions for use, dependable performance.
(3) adopt high-low pressure duplex pump, accumulator, improved operating efficiency, practiced thrift the energy.
In hydraulic cylinder F.F., punching press, the process returned; Requirement to pressure and flow has nothing in common with each other; Descend fast and when returning the system pressure low discharge big, the system demand pressure high flow capacity is little during punching press, in order to realize the resources effective configuration better; Energy savings, the utility model adopts the high-low pressure duplex pump of being made up of high-pressure pump and low-lift pump.Rapid movement and punching press action by being used alternatingly of high-pressure pump and low-lift pump realized hydraulic cylinder have improved operating efficiency, have practiced thrift the energy.In order to realize the rapid movement of hydraulic cylinder better, in system, added accumulator, it can improve flow system flow where necessary as auxiliary power source, and then improves the movement velocity of executive component, can also reduce noise simultaneously, absorbs and impacts, and reduces vibration.Because this system's punching press frequency is high; Require high-low pressure duplex pump shock resistance good, the high-low pressure duplex pump adopts the PVPCX2E duplex pump of atos company in this programme, is made up of a plunger displacement pump and a vane pump; Plunger displacement pump provides hydraulic oil; Rated pressure is 28MPa, and maximum pressure reaches 35MPa, can satisfy the operating pressure 28MPa of system requirements.Vane pump provides low pressure and mass flow oil.Can satisfy system's instructions for use.Therefore the utility model has compared with prior art been realized technical purpose.
Description of drawings
Fig. 1 is the numerical control punching machine part hydraulic schematic diagram (clamp is partly controlled oil circuit and is not included in interior) of this programme.Among the figure: 1-motor, 2-high-low pressure duplex pump (wherein 2-1 is a high-pressure pump, and 2-2 is a low-lift pump), 4-high-pressure filter, 5-high-pressure filter; 6-the second check valve, 7-low-lift pump pressure regulation unloader group, 8-the second accumulator, 9-the first check valve, 10-high-pressure pump pressure regulation unloader group; 11-digital display pressure inverting controller, 12-Pressure gauge, 13-the first accumulator, 14-the three accumulator, 15-electrohydraulic servo valve or high frequency sound proportioning valve; 16-overflow valve, 17-hydraulicchange-over valve, 18-hydraulic cylinder, 19-displacement transducer; 20-air filter, 21-cooler, 22-oil return oil filter, 23-accumulator safety valve group.
The specific embodiment
As shown in Figure 1; The dull and stereotyped perforating press electrofluidic control device of a kind of numerical control; It comprises the high-low pressure duplex pump of being made up of high-pressure pump 2-1 and low-lift pump 2-2 2, electrohydraulic servo valve or high frequency sound proportioning valve 15, the differential type speed accelerating circuits of hydraulicchange-over valve 17 and hydraulic cylinder 18 compositions.Parallel connection is provided with high-pressure pump pressure regulation unloader group 10 on the pipeline between first check valve 9 of high-pressure pump 2-1 oil-out and series connection with it, and parallel connection is provided with low-lift pump pressure regulation unloader group 7 on the pipeline between second check valve 6 of low-lift pump 2-2 oil-out and series connection with it.Pressure regulation unloader group comprises Z2D plug-in unit, the F22 cover plate that two-position four-way solenoid directional control valve and Ji'nan Foundry & Metalforming Machinery Research Institute Co., Ltd. produce.High-pressure pump 2-1 pressure regulation off-load is accomplished by pressure regulation unloader group 10, when system pressure reaches setting value, and digital display pressure inverting controller 11 senders, the solenoid directional control valve dead electricity in the pressure regulation unloader group 10, high-pressure pump 2-1 off-load.When magnetic valve gets when electric, come initialization system pressure through the handwheel of regulating pressure regulation unloader group 10.Low-lift pump 2-2 pressure regulation off-load is accomplished by pressure regulation unloader group 7.Parallel connection is provided with the 3rd accumulator 14 on oil return line, and vibration is eliminated in hydraulic shock that can absorption system, can also improve the stability of system simultaneously.
In the 9 back parallel connections of differential type speed accelerating circuits first check valve first accumulator 13 and accumulator safety valve group 23 loops and Pressure gauge and digital display pressure inverting controller 11 are set; Accumulator 13 can improve flow system flow where necessary as auxiliary power source, and then improves the movement velocity of executive component, can also reduce noise simultaneously, absorbs and impacts, and reduces vibration.When accumulator safety valve group 23 is convenient to system overhaul, discharge the pressure oil in the accumulator 13.Parallel connection is provided with second accumulator 8 between hydraulic cylinder 18 and the hydraulicchange-over valve 17 in the differential type speed accelerating circuits.When hydraulic cylinder 18 backhauls, the high-low pressure duplex pump 2 and second accumulator 8 are realized the quick return of hydraulic cylinder 18 simultaneously to hydraulic cylinder 18 cavity of resorption fuel feeding.On oil return line, be in series with cooler 21 and oil return oil filter 22.
Operation principle is following:
(1) descending fast
The input voltage of electrohydraulic servo valve (or high frequency sound proportioning valve) 15 is correct time; Its right position work; The hydraulic oil that low-lift pump 2-2 discharges passes through electrohydraulic servo valve (or high frequency sound proportioning valve) 15 right positions through check valve 6 and the hydraulic oil that high-pressure pump 2-1 discharges through check valve 9 together; Get into hydraulic cylinder 18 epicoeles (rodless cavity); The hydraulic oil of hydraulic cylinder 18 cavity of resorptions (rod chamber) gets into the hydraulic cylinder epicoele through hydraulicchange-over valve 17 and electrohydraulic servo valve (or high frequency sound proportioning valve) 15, has formed differential quick loop, and piston rod drives drift and moves downward fast.
(2) flexible punching press
When drift ran into workpiece, system pressure raise, when reaching the set pressure of hydraulicchange-over valve 17; Position, hydraulicchange-over valve 17 left side is connected; Digital display pressure inverting controller 11 senders signal pressure regulation unloader group 7 electromagnet dead electricity through the control system; Low-lift pump 2-2 is through 7 off-loads of pressure regulation unloader group, and differential circuit is cut off.Only by high-pressure pump 2-1 through electrohydraulic servo valve 15 right positions to hydraulic cylinder epicoele fuel feeding, piston slowly moves downward, stamped workpieces.The hydraulic oil of hydraulic cylinder 18 cavity of resorptions is to accumulator 8 topping ups, and when cavity pressure reached overflow valve 16 setting values instantly, overflow valve 16 was opened, and hydraulic oil is through hydraulicchange-over valve 17 and overflow valve 16 oil sump tanks.
(3) fast return
After punching press finished, drift reached the next limit, and displacement transducer 19 signals to the control system; The input voltage signal that makes electrohydraulic servo valve (or high frequency sound proportioning valve) 15 is controlled the position work of electrohydraulic servo valve 15 left side, the disappearance of load simultaneously for negative; System pressure reduces; Hydraulicchange-over valve 17 right positions are connected, and low-lift pump 2-2, high-pressure pump 2-1 and accumulator 8 are simultaneously to hydraulic cylinder 18 cavity of resorption fuel feeding, and the hydraulic oil of epicoele is oil sump tank through the position, a left side of electrohydraulic servo valve 15; Piston rod moves upward fast, accomplishes an operation cycle.
Claims (6)
1. the dull and stereotyped perforating press electrofluidic control device of numerical control is characterized in that it comprises the high-low pressure duplex pump of being made up of high-pressure pump and low-lift pump, electrohydraulic servo valve or high frequency sound proportioning valve, the differential type speed accelerating circuits that hydraulicchange-over valve and hydraulic cylinder are formed.
2. the dull and stereotyped perforating press electrofluidic control device of numerical control according to claim 1; It is characterized in that parallel connection is provided with high-pressure pump pressure regulation unloader group on the pipeline between first check valve of high-pressure pump oil-out and series connection with it, parallel connection is provided with low-lift pump pressure regulation unloader group on the pipeline between second check valve of low-lift pump oil-out and series connection with it.
3. the dull and stereotyped perforating press electrofluidic control device of numerical control according to claim 1 is characterized in that parallel connection is provided with the 3rd accumulator on oil return line.
4. the dull and stereotyped perforating press electrofluidic control device of numerical control according to claim 1 is characterized in that parallel connection is provided with first accumulator and accumulator safety valve group loop behind differential type speed accelerating circuits first check valve, also has Pressure gauge and digital display pressure inverting controller.
5. the dull and stereotyped perforating press electrofluidic control device of numerical control according to claim 1 is characterized in that in the differential type speed accelerating circuits parallel connection is provided with second accumulator between the hydraulic cylinder and hydraulicchange-over valve.
6. the dull and stereotyped perforating press electrofluidic control device of numerical control according to claim 1 is characterized in that on oil return line, being in series with cooler and oil return oil filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201377469U CN202097266U (en) | 2011-05-04 | 2011-05-04 | Electric hydraulic control device of numerical control flat punching machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201377469U CN202097266U (en) | 2011-05-04 | 2011-05-04 | Electric hydraulic control device of numerical control flat punching machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202097266U true CN202097266U (en) | 2012-01-04 |
Family
ID=45383300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201377469U Expired - Lifetime CN202097266U (en) | 2011-05-04 | 2011-05-04 | Electric hydraulic control device of numerical control flat punching machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202097266U (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966615A (en) * | 2012-11-26 | 2013-03-13 | 山东法因数控机械股份有限公司 | Servo hydraulic control system with automatically adjustable punching stroke and speed of punch press |
| CN103143766A (en) * | 2013-03-06 | 2013-06-12 | 苏州经贸职业技术学院 | Waste material separator |
| CN103696994A (en) * | 2014-01-11 | 2014-04-02 | 谭桂新 | High-speed hydraulic impacting system |
| CN104196778A (en) * | 2014-09-22 | 2014-12-10 | 北京布鲁斯格环保科技有限公司 | Hydraulic servo device |
| CN106151128A (en) * | 2016-08-22 | 2016-11-23 | 安阳市三兴机械工业有限责任公司 | Digital display type high-low pump riveting machine Hydraulic Station and riveting process |
| CN106246632A (en) * | 2016-09-18 | 2016-12-21 | 上海衡拓船舶设备有限公司 | The spud leg fast lifting hydraulic circuit of hydraulic bolt formula jacking system |
| CN107504020A (en) * | 2017-10-16 | 2017-12-22 | 太原理工大学 | A kind of isothermal die forging process hydraulic system of press |
| CN107842530A (en) * | 2017-11-27 | 2018-03-27 | 南通锻压设备股份有限公司 | A kind of hydraulic system of high speed drift |
| WO2018152971A1 (en) * | 2017-02-21 | 2018-08-30 | 深圳市凯卓立液压设备股份有限公司 | Rapid lifting hydraulic device |
| CN108488113A (en) * | 2018-03-30 | 2018-09-04 | 江苏恒立液压科技有限公司 | Self-action hydraulic circuit system |
| CN108730246A (en) * | 2018-08-16 | 2018-11-02 | 宁波联城住工科技有限公司 | The hydraulic control system and material distributing machine of material distributing machine |
| CN108757650A (en) * | 2018-06-29 | 2018-11-06 | 日照职业技术学院 | A kind of fluid pressure drive device and control method of construction machinery |
| CN110552917A (en) * | 2019-09-05 | 2019-12-10 | 东北大学 | Hydraulic servo system based on extremely thin steel sheet roll-in formula quenching machine |
| WO2024037341A1 (en) * | 2022-08-16 | 2024-02-22 | 曼弗莱德智能制造(江苏)有限公司 | Energy-saving hydraulic press for stamping die and energy-saving method |
-
2011
- 2011-05-04 CN CN2011201377469U patent/CN202097266U/en not_active Expired - Lifetime
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966615A (en) * | 2012-11-26 | 2013-03-13 | 山东法因数控机械股份有限公司 | Servo hydraulic control system with automatically adjustable punching stroke and speed of punch press |
| CN103143766A (en) * | 2013-03-06 | 2013-06-12 | 苏州经贸职业技术学院 | Waste material separator |
| CN103696994A (en) * | 2014-01-11 | 2014-04-02 | 谭桂新 | High-speed hydraulic impacting system |
| CN104196778A (en) * | 2014-09-22 | 2014-12-10 | 北京布鲁斯格环保科技有限公司 | Hydraulic servo device |
| CN106151128A (en) * | 2016-08-22 | 2016-11-23 | 安阳市三兴机械工业有限责任公司 | Digital display type high-low pump riveting machine Hydraulic Station and riveting process |
| CN106151128B (en) * | 2016-08-22 | 2018-06-01 | 安阳市三兴机械工业有限责任公司 | Digital display type high-low pump riveting machine hydraulic station and riveting process |
| CN106246632A (en) * | 2016-09-18 | 2016-12-21 | 上海衡拓船舶设备有限公司 | The spud leg fast lifting hydraulic circuit of hydraulic bolt formula jacking system |
| CN106246632B (en) * | 2016-09-18 | 2017-12-15 | 上海衡拓船舶设备有限公司 | The spud leg fast lifting hydraulic circuit of hydraulic bolt formula jacking system |
| WO2018152971A1 (en) * | 2017-02-21 | 2018-08-30 | 深圳市凯卓立液压设备股份有限公司 | Rapid lifting hydraulic device |
| CN107504020A (en) * | 2017-10-16 | 2017-12-22 | 太原理工大学 | A kind of isothermal die forging process hydraulic system of press |
| CN107842530A (en) * | 2017-11-27 | 2018-03-27 | 南通锻压设备股份有限公司 | A kind of hydraulic system of high speed drift |
| CN107842530B (en) * | 2017-11-27 | 2019-05-31 | 南通锻压设备如皋有限公司 | A kind of hydraulic system of high speed formed punch |
| CN108488113A (en) * | 2018-03-30 | 2018-09-04 | 江苏恒立液压科技有限公司 | Self-action hydraulic circuit system |
| CN108488113B (en) * | 2018-03-30 | 2020-12-04 | 江苏恒立液压科技有限公司 | Automatic hydraulic circuit system |
| CN108757650A (en) * | 2018-06-29 | 2018-11-06 | 日照职业技术学院 | A kind of fluid pressure drive device and control method of construction machinery |
| CN108730246A (en) * | 2018-08-16 | 2018-11-02 | 宁波联城住工科技有限公司 | The hydraulic control system and material distributing machine of material distributing machine |
| CN108730246B (en) * | 2018-08-16 | 2020-05-22 | 广东联城住工装备信息科技有限公司 | Hydraulic control system of material distributing machine and material distributing machine |
| CN110552917A (en) * | 2019-09-05 | 2019-12-10 | 东北大学 | Hydraulic servo system based on extremely thin steel sheet roll-in formula quenching machine |
| WO2024037341A1 (en) * | 2022-08-16 | 2024-02-22 | 曼弗莱德智能制造(江苏)有限公司 | Energy-saving hydraulic press for stamping die and energy-saving method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202097266U (en) | Electric hydraulic control device of numerical control flat punching machine | |
| CN101712207A (en) | High performance and energy-saving double-acting hydrostatic press driven by servo motor | |
| CN103899586B (en) | A kind of super sized type guillotine shear synchronization hydraulic system based on flow divider-combiner | |
| CN103801751B (en) | Based on the fully-automatic plate shearing machine hydraulic system that PLC controls | |
| CN103807239A (en) | Dual output shaft motor based shear plate synchronous control hydraulic system | |
| CN204099304U (en) | A kind of baby press hydraulic driving system | |
| CN102518609A (en) | High speed punch hydraulic system | |
| CN205013408U (en) | Differential hydraulic control device is entirely cut to steel scrap | |
| CN204739038U (en) | Servo hydraulic system of sheet material bender | |
| CN203856789U (en) | Pressure-maintaining speed-stabilizing hydraulic system of hydraulic machine | |
| CN202986163U (en) | Liquid and gas transformation pressurization device of numerical control turret-type punching machine | |
| CN107939751A (en) | A kind of shearing method of hydraulic plate shears | |
| CN102168695B (en) | Hydraulic system principle of blanking buffering device of hydraulic press | |
| CN205009649U (en) | Mechanical press hydraulic die cushion controlling means | |
| CN203717500U (en) | Plate shearing synchronous hydraulic control system based on double-output-shaft motor | |
| CN103862705B (en) | The liquid gas shift supercharging device of Numerical Control Turret Punch Press Machine | |
| CN204003680U (en) | Novel master cylinder hydraulic circuit system | |
| CN204773760U (en) | Novel servo double acting hydraulic drawing press control system of numerical control | |
| CN108708889A (en) | A kind of energy-saving low fast-response mixing control servo-hydraulic machine hydraulic system that shakes | |
| CN213176224U (en) | Hydraulic control loop of constant-power reinforcing steel bar granulator | |
| CN203685776U (en) | Numerical control electric-hydraulic proportional system of steel pipe straightening machine | |
| RU145394U1 (en) | ADAPTIVE HYDRAULIC PRESS MANAGEMENT SYSTEM | |
| CN108994367B (en) | Plate shearing machine and hydraulic system thereof | |
| CN202895765U (en) | Wide-table-face hydraulic machine closed-loop electrohydraulic control system with unbalance-loading resistant function | |
| CN103372625B (en) | Anisobaric-three-cylinder large forging oil press |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20180613 Granted publication date: 20120104 |
|
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20200613 Granted publication date: 20120104 |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201022 Address after: Room 9a102, No.8, Yushan Industrial Park, Guangzhu Road, Shangni village, Lanhe Town, Nansha District, Guangzhou City, Guangdong Province Patentee after: Guangzhou Liding Auto Parts Co.,Ltd. Address before: 250306 No. 500 Fenghuang Road, Changqing District, Shandong, Ji'nan Patentee before: JINAN FOUNDRY AND METAL FORMING MACHINERY RESEARCH INSTITUTE Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |