CN106050800A - Electro-hydraulic reversing device for hydraulic profile control injection pump - Google Patents
Electro-hydraulic reversing device for hydraulic profile control injection pump Download PDFInfo
- Publication number
- CN106050800A CN106050800A CN201610564522.3A CN201610564522A CN106050800A CN 106050800 A CN106050800 A CN 106050800A CN 201610564522 A CN201610564522 A CN 201610564522A CN 106050800 A CN106050800 A CN 106050800A
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- electro
- valve
- travel switch
- hydraulic reversing
- 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.)
- Granted
Links
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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
-
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/77—Control of direction of movement of the output member
- F15B2211/7725—Control of direction of movement of the output member with automatic reciprocation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention belongs to the field of pump injection equipment for oilfield operation and discloses an electro-hydraulic reversing device for a hydraulic profile control injection pump. The electro-hydraulic reversing device mainly comprises mud rods, a hydraulic cylinder piston rod, travel switches, an electro-hydraulic reversing valve, travel switch brackets and a control circuit, and further comprises a reversing valve base, wherein the electro-hydraulic reversing valve is fixed on the electro-hydraulic reversing valve base; a throttle valve is additionally arranged between a reversing valve main body and an electro-hydraulic pilot reversing valve; the electro-hydraulic reversing device further comprises the travel switches which are mounted on the travel switch brackets, and are connected with adjusting back nuts when the hydraulic cylinder piston rod reciprocates; and the control circuit, which is controlled by a circuit board and proximity switches originally, is controlled by a relay and the travel switches and meanwhile is additionally provided with two diodes. The throttle valve is mounted on the electro-hydraulic reversing device, and can reduce impact on an oil circuit during reversing to reduce vibrations; and the original proximity switches are replaced by the travel switches, so that the electro-hydraulic reversing device is more stable and reliable in reversing, has a long service life and a simple structure and is convenient to replace.
Description
Technical field
The invention belongs to oil field operation pumping-in equipment technical field, more particularly, it relate to a kind of hydraulic profile control note
Enter the electro-hydraulic reversing arrangement of pump.
Background technology
TPB Series Hydraulic profile control injection pump, it is a kind of profile control and water plugging special, applicable and the hydraulic reciprocating noting poly-operation
Formula profile control injection device, this pump is particularly suitable for heavy dose, long-time, voltage stabilizing water plugging and profile controlling operation, it is adaptable to current oil field uses
Various blocking agents.This equipment has been widely used in the profile control and water plugging operation of national each elephant now, and has become
For one of visual plant used in oil field secondary, tertiary oil recovery increasing oil measure.This pump has used hydraulic transmission principle, by electricity
The high-speed rotating machine of motivation can be converted into the pressure energy of hydraulic oil by variable displacement with constant power oil pump, then by hydraulic pressure oscillator by liquid
The pressure of force feed can be directly changed into the pressure energy of working solution by piston, thus changes traditional mechanical drive train, reduces
Machine driving link, it is achieved that the high efficiency transmission of energy.
The reversing arrangement of existing hydraulic profile control injection pump, is all controlled sensor by proximity switch, and commutation is unstable, no
Reliably, structure is complicated, changes inconvenience；The control circuit part of reversing arrangement uses circuit board control, because wiring board
It is non-standard, and fabrication and processing is relatively difficult, keep in repair the most extremely difficult after damage, simultaneously if there is also inconvenient after problem
Search reason, greatly reduce production efficiency；Existing reversing arrangement, if be persistently energized for a long time, it is easy to damages gadget,
The requirement being electrified for a long time can not be met, had influence on production efficiency the most to a certain extent.
Summary of the invention
Present invention is primarily targeted at and overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of hydraulic profile control injection pump electricity consumption
Liquid reversing arrangement, to solve the problems such as unstable unreliable, maintenance difficult that commutate of the prior art.
In order to overcome the deficiencies in the prior art, the invention provides a kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump,
It mainly includes mud bar, hydraulic cylinder piston rod, travel switch, electro-hydraulic reversing valve, travel switch fixed mount and control circuit, liquid
Female thread is processed in the end of pressure cylinder piston bar, and external screw thread is processed in the end of mud bar, and hydraulic cylinder piston rod is pacified with mud bar
Fill the diameter regulation back of the body mother more than mud shank diameter, top board offers screwed hole, in order to fixed journey system switch
Frame, is fixed on travel switch on travel switch bracket, solve its technical problem be employed technical scheme comprise that also include commutation
Valve base, reversal valve base is fixedly installed electro-hydraulic reversing valve, and electro-hydraulic reversing valve is mainly by reversal valve main body and first conductive magnetism
Reversal valve forms, and also has additional choke valve, also set on described choke valve between reversal valve main body and guide's solenoid directional control valve
Being equipped with adjusting screw rod, the end of described adjusting screw rod is fixedly connected with adjusting nut, around adjusting nut, the one of choke valve
Scale numeral it is fixedly installed on outer face, side；Described electro-hydraulic reversing arrangement also include being arranged on travel switch bracket and
The travel switch contacted with the regulation back of the body mother when hydraulic cylinder piston rod moves back and forth；Described control circuit is relay and stroke is opened
Closing and control, control circuit also has additional two diodes, described diode is in parallel with guide's solenoid directional control valve control line.
Preferably, above-mentioned travel switch is rolling wheel type travel switch.
Further, the position, front end of the electric magnet that two above-mentioned diodes are arranged on guide's solenoid directional control valve respectively
Put place.
Further, when upper described adjusting nut turns clockwise, scale numeral becomes larger；Described regulation spiral shell
When mother rotates counterclockwise, scale numeral tapers into.
Compared with prior art, the present invention is had the beneficial effect that
1, the electro-hydraulic reversing valve of the present invention increases installation choke valve between reversal valve main body and guide's solenoid directional control valve, this
Impact to oil circuit when sample can reduce commutation, reduces vibrations；
2, sensor of the invention is changed into travel switch by previous proximity switch, commutates more stable, reliably, and the life-span
Long, simple in construction and replacing are convenient；
3, the control circuit of the present invention is controlled by previous circuit board and proximity switch, changes present relay and stroke into
On-off control, and in control circuit, increase by two diodes, diode is in parallel with guide's solenoid directional control valve control line, effect
Being to produce a high voltage pulse during electromagnetic valve commutation, this pulse easily burns out relay, can absorb after increasing diode
This pulse, protective relay increases the service life, so that it is relatively reliable durable to commutate；
4, the commutation control circuit of the present invention, eliminates previous wiring board and controls, it is contemplated that wiring board is non-standard,
And fabrication and processing is difficult, maintenance difficult after damage, so changing present relay and diode control, relay and two poles into
Manage all standard components, easy-to-look-up reason after going wrong, and purchase easy to maintenance.
It addition, in addition to objects, features and advantages described above, the present invention also have other purpose, feature and
Advantage.Below with reference to accompanying drawings, the present invention is further detailed explanation.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing a further understanding of the present invention, and the present invention shows
Meaning property embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.
Fig. 1 is the structural representation of the electro-hydraulic reversing arrangement of hydraulic profile control injection pump of the present invention；
Fig. 2 is the FB(flow block) of the hydraulic profile control injection pump of the present invention control circuit of electro-hydraulic reversing arrangement；
In figure: 1 travel switch, 2 reversal valve bases, 3 reversal valve main bodys, 4 choke valves, 5 guide's solenoid directional control valves, 6 regulations
Nut, 7 hydraulic cylinder piston rods, the 8 regulation back ofs the body are female, 9 mud bars.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in further detail and illustrates, but this
The bright multitude of different ways that can be defined by the claims and cover is implemented.
As shown in Figure 1 to Figure 2: a kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump, it mainly includes mud bar 9, liquid
Pressure cylinder piston bar 7, travel switch 1, electro-hydraulic reversing valve, travel switch fixed mount and control circuit, the end of hydraulic cylinder piston rod 7
Being processed into female thread, external screw thread is processed in the end of mud bar 9, and hydraulic cylinder piston rod 7 and mud bar 9 are installed a diameter and be more than
The regulation back of the body female 8 of mud shank diameter, offers screwed hole, in order to fixed journey system switch bracket, by travel switch 1 on top board
It is fixed on travel switch bracket.
As a modification of the present invention, this electro-hydraulic reversing arrangement also includes reversal valve base 2, solid on reversal valve base 2
Surely being provided with electro-hydraulic reversing valve, electro-hydraulic reversing valve is mainly made up of with guide's solenoid directional control valve 5 reversal valve main body 3, at reversal valve
Also have additional choke valve 4 between main body 3 and guide's solenoid directional control valve 5, install when choke valve 4 can reduce commutation and oil circuit is rushed
Hit, reduce vibrations；Being additionally provided with adjusting screw rod on above-mentioned choke valve 4, the end of above-mentioned adjusting screw rod is fixedly connected with regulation
Nut 6, is fixedly installed scale numeral around adjusting nut 6, on the outer face, side of choke valve 4；
Further, above-mentioned electro-hydraulic reversing arrangement also includes being arranged on travel switch bracket and at hydraulic cylinder piston rod
7 travel switches 1 contacted with the regulation back of the body female 8 when moving back and forth, further, above-mentioned travel switch 1 is roller type stroke
Switch.Using after travel switch, commutate more reliable and more stable, the life-span is long, simple in construction and also change convenience.
Control circuit is relay and travel switch 1 controls, and control circuit also has additional two diodes, diode with
Guide's solenoid directional control valve 5 control line is in parallel, before two diodes are arranged on the electric magnet on guide's solenoid directional control valve 5 respectively
At end position.After using the mode of two diodes set up, the effect played is because during electromagnetic valve commutation producing one
High voltage pulse, the existence of this pulse easily burns out relay, can absorb this pulse, thus protect relay after increasing diode
Device, can be greatly prolonged service life, makes commutation relatively reliable durable simultaneously.
Further, when adjusting nut 6 turns clockwise, scale numeral becomes larger, and throttle valve core hole becomes big,
Hydraulic oil inflow-rate of water turbine becomes big, and commutation is fast, buffers little；Otherwise, when adjusting nut 6 rotates counterclockwise, scale numeral can gradually become
Little, throttle valve core hole diminishes, and hydraulic oil inflow-rate of water turbine diminishes, and commutation is slow, and buffering is big.
As the another kind of improvement of the present invention, the electro-hydraulic reversing arrangement of the present invention eliminates previous wiring board and controls, examines
Considering and need to have made to order according to the actual requirements to wiring board, belonging to is non-standard, and fabrication and processing is difficult, and after damage, maintenance is tired
Difficulty, so changing present relay and diode control into, relay and all standard components of diode, if there is problem,
Reason can be found out easily, and purchase, change and keep in repair the most very convenient, substantially increase production efficiency.
The brief introduction of work principle of the electro-hydraulic reversing arrangement of the present invention: interior spiral shell is processed in hydraulic cylinder piston rod 7 end of the present invention
Stricture of vagina, mud bar 9 end is processed into external screw thread, and the regulation more than mud bar of the diameter installed by hydraulic cylinder piston rod 7 and mud bar 9
The back of the body female 8, thread mill drilling on top board, fixed journey system switch bracket, travel switch 1 is fixed on travel switch bracket conjunction
Right position is put, and is used for touching the regulation back of the body female 8.After the regulation back of the body female 8 moves to travel switch 1 position with hydraulic cylinder piston rod 7, touching
To travel switch roller, make travel switch 1 closing of contact, corresponding relay, relay in passing to power distribution cabinet by control line
Produce after accepting signal and control electric current, and passed to the electric magnet of guide's solenoid directional control valve 5 respective end, electric magnet by control line
Electric after adhesive, pilot valve action, thus drive main valve plug action, thus change the direction of hydraulic circuit, hydraulic cylinder changes
Work to rightabout.That is: if run from right to left, the travel switch action on the right, output is to guide's solenoid directional control valve 5
Signal, oil circuit commutates, now, and left side oil-feed, the right oil return；Otherwise, the most on the contrary.Simple speech, it is simply that relay adhesive, control
Guide's solenoid directional control valve 5 action, oil circuit commutates, such that it is able to reach the purpose of commutation.
In addition, it is necessary to explanation, the travel switch that the present invention uses, can be rolling wheel type travel switch, travel switch
Effective number of run can reach 2,000,000 times, according to actual service condition, travel switch can be timed replacing,
The shutdown of operation troubles can be avoided, be conducive to improving production efficiency.
Content described in description above and accompanying drawing is only exemplary rather than being given for limiting purpose
's.Although hereinbefore already in connection with accompanying drawing only certain embodiments of the present invention being described in detail and having illustrated, but for
For those skilled in the art, it is clear that can under the premise of without departing from the spirit of the present invention the present invention be made various
Amendment or change.In order to enable the invention to be effectively protected, claims appended hereto will attempt to cover
All various amendments fallen within spirit of the present invention or the technical scheme of change.
Claims (4)
1. the electro-hydraulic reversing arrangement of hydraulic profile control injection pump, it mainly includes that mud bar, hydraulic cylinder piston rod, stroke are opened
Pass, electro-hydraulic reversing valve, travel switch fixed mount and control circuit, female thread, mud bar are processed in the end of hydraulic cylinder piston rod
End be processed into external screw thread, the diameter regulation back of the body mother more than mud shank diameter installed by hydraulic cylinder piston rod and mud bar,
Top board offers screwed hole, in order to fixed journey system switch bracket, travel switch is fixed on travel switch bracket, its
Being characterised by: also include reversal valve base, reversal valve base is fixedly installed electro-hydraulic reversing valve, electro-hydraulic reversing valve is mainly by changing
Form with guide's solenoid directional control valve to valve body, between reversal valve main body and guide's solenoid directional control valve, also have additional choke valve,
Being additionally provided with adjusting screw rod on described choke valve, the end of described adjusting screw rod is fixedly connected with adjusting nut, at regulation spiral shell
It is fixedly installed scale numeral on female surrounding, the outer face, side of choke valve；Described electro-hydraulic reversing arrangement also includes installing
The travel switch contacted with regulation back of the body mother on travel switch bracket and when hydraulic cylinder piston rod moves back and forth；Described control
Circuit is that relay and travel switch control, and control circuit also has additional two diodes, described diode with first conduct electricity
Magnetic reversal valve control line is in parallel.
A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump the most according to claim 1, it is characterised in that: described row
Cheng Kaiguan is rolling wheel type travel switch.
A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump the most according to claim 1, it is characterised in that: described two
Individual diode is arranged at the front position of the electric magnet on guide's solenoid directional control valve respectively.
A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump the most according to claim 1, it is characterised in that: described tune
When joint nut turns clockwise, scale numeral becomes larger；When described adjusting nut rotates counterclockwise, scale numeral gradually becomes
Little.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610564522.3A CN106050800B (en) | 2016-07-16 | 2016-07-16 | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610564522.3A CN106050800B (en) | 2016-07-16 | 2016-07-16 | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106050800A true CN106050800A (en) | 2016-10-26 |
| CN106050800B CN106050800B (en) | 2017-10-10 |
Family
ID=57187219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610564522.3A Expired - Fee Related CN106050800B (en) | 2016-07-16 | 2016-07-16 | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106050800B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116733707A (en) * | 2023-08-11 | 2023-09-12 | 德州学院 | Micro-fracture network pressure-driven injection equipment for low/ultra-low permeability oil reservoir |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB764182A (en) * | 1953-08-19 | 1956-12-19 | North American Aviation Inc | Improvements in or relating to a hydraulic regulating device |
| US4726450A (en) * | 1985-11-18 | 1988-02-23 | Otis Elevator Company | Hydraulic elevator with dynamically programmed motor-operated valve |
| DE4016816A1 (en) * | 1990-05-25 | 1991-11-28 | Bosch Gmbh Robert | EM valve with spring-centred control slider adjustment - provides for temporary energisation of opposite electromagnet as buffer against slider over=run beyond middle position |
| CN200961566Y (en) * | 2006-10-31 | 2007-10-17 | 大庆油田有限责任公司 | Piston type monocylinder double-action profile control agent injection pump |
| CN202370773U (en) * | 2011-12-19 | 2012-08-08 | 德州联合石油机械有限公司 | High-pressure small-discharge hydraulic profile control water plugging pump |
| CN203130399U (en) * | 2013-04-01 | 2013-08-14 | 中国石油化工股份有限公司 | Shutoff and driving adjusting device using water injection pump as power |
| CN204716663U (en) * | 2015-04-09 | 2015-10-21 | 刘怡宁 | Liquid, air pressure linear actuator pressure signal extraction apparatus |
| CN205117315U (en) * | 2015-10-13 | 2016-03-30 | 杜新忠 | Novel hydraulic pressure profile control blocks up water pump |
| CN205780037U (en) * | 2016-07-16 | 2016-12-07 | 德州华海石油机械股份有限公司 | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump |
-
2016
- 2016-07-16 CN CN201610564522.3A patent/CN106050800B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB764182A (en) * | 1953-08-19 | 1956-12-19 | North American Aviation Inc | Improvements in or relating to a hydraulic regulating device |
| US4726450A (en) * | 1985-11-18 | 1988-02-23 | Otis Elevator Company | Hydraulic elevator with dynamically programmed motor-operated valve |
| DE4016816A1 (en) * | 1990-05-25 | 1991-11-28 | Bosch Gmbh Robert | EM valve with spring-centred control slider adjustment - provides for temporary energisation of opposite electromagnet as buffer against slider over=run beyond middle position |
| CN200961566Y (en) * | 2006-10-31 | 2007-10-17 | 大庆油田有限责任公司 | Piston type monocylinder double-action profile control agent injection pump |
| CN202370773U (en) * | 2011-12-19 | 2012-08-08 | 德州联合石油机械有限公司 | High-pressure small-discharge hydraulic profile control water plugging pump |
| CN203130399U (en) * | 2013-04-01 | 2013-08-14 | 中国石油化工股份有限公司 | Shutoff and driving adjusting device using water injection pump as power |
| CN204716663U (en) * | 2015-04-09 | 2015-10-21 | 刘怡宁 | Liquid, air pressure linear actuator pressure signal extraction apparatus |
| CN205117315U (en) * | 2015-10-13 | 2016-03-30 | 杜新忠 | Novel hydraulic pressure profile control blocks up water pump |
| CN205780037U (en) * | 2016-07-16 | 2016-12-07 | 德州华海石油机械股份有限公司 | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116733707A (en) * | 2023-08-11 | 2023-09-12 | 德州学院 | Micro-fracture network pressure-driven injection equipment for low/ultra-low permeability oil reservoir |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106050800B (en) | 2017-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105108120A (en) | Automatic casting mechanism | |
| CN106050800B (en) | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump | |
| CN205780037U (en) | A kind of electro-hydraulic reversing arrangement of hydraulic profile control injection pump | |
| CN202659339U (en) | Magnetic boosting system of engine piston | |
| CN102925654B (en) | Crankshaft output end rod portion quenching technology | |
| CN201723820U (en) | Electronic control system for electromagnetic valve | |
| CN108711814B (en) | Power grid deicing inspection energy-saving robot | |
| CN202370426U (en) | Piston stroke fast adjusting device for hydraulic rock drill | |
| CN201533267U (en) | Magnetogenerator | |
| CN108061191A (en) | A kind of valve motor drive mechanism | |
| CN105888904B (en) | Non-crystaline amorphous metal composite iron core electromagnetic control oil sprayer | |
| CN205012978U (en) | Poor step of sharp intelligent oil production device in pit | |
| CN104135135A (en) | High-efficiency large-thrust cylindrical permanent-magnet linear motor for oil pumping unit | |
| CN200943574Y (en) | Large power submersible linear permanent-magnet step motor plunger pump | |
| CN103612737B (en) | A kind of bucket spoon control setup of hydraulic efficiency jet propulsion system and method | |
| CN2906158Y (en) | Sleeve valve for controlling nitrogen explosion type hydraulic breaking hammer | |
| CN203362205U (en) | Variation movable pulley mechanism capable of using small stroke for realizing long travel distance | |
| CN204113377U (en) | For the axle upender of machinery with automatically controlled modular cylinder lubrication system | |
| CN208662598U (en) | A kind of magnetic base drill fixing device | |
| CN201924687U (en) | Electric control lock | |
| CN110085486A (en) | Double drive high-speed switch | |
| CN204304753U (en) | A kind of electric pushrod | |
| CN204711991U (en) | A kind of reclosing electric pick | |
| CN204504874U (en) | Floor-type milling & boring machine ram deflection compensation mechanism | |
| CN203604770U (en) | High-frequency-response direct-acting switch valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171010 Termination date: 20190716 |