CN103286970B - Toggle link idle stroke energy-saving hydraulic press - Google Patents
Toggle link idle stroke energy-saving hydraulic press Download PDFInfo
- Publication number
- CN103286970B CN103286970B CN201310242643.2A CN201310242643A CN103286970B CN 103286970 B CN103286970 B CN 103286970B CN 201310242643 A CN201310242643 A CN 201310242643A CN 103286970 B CN103286970 B CN 103286970B
- Authority
- CN
- China
- Prior art keywords
- elbow
- toggle link
- bar mechanism
- idle stroke
- arm
- 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
Abstract
The present invention relates to the press with hydraulic plunger, particularly relate to a kind of toggle link idle stroke energy-saving hydraulic press.Comprise press frame, moved cross beam, master cylinder and guiding mechanism, moved cross beam is placed between the entablature of press frame and sill, can move up and down along guiding mechanism, master cylinder is placed on entablature, press has impulse stroke and idle stroke, wherein impulse stroke is completed by master cylinder, its structural feature is, also include elbow-bar mechanism and toggle link drive unit, it is symmetrical along press center line that elbow-bar mechanism has two pairs, and another termination of two elbow arm up and down of every secondary elbow-bar mechanism is connected with master cylinder plunger end and moved cross beam respectively, this connects or directly links or undertaken hinged by transition member, between two secondary elbow-bar mechanism, horizontal cross-over connection has toggle link drive unit, cross-over connection place is hinged, oil cylinder or cylinder is included in toggle link drive unit, through the driving of toggle link drive unit, two secondary elbow-bar mechanism or be bent outwardly simultaneously or curve inwardly simultaneously, elbow arm bends with it and stretches the two-end-point up and down of corresponding press idle stroke respectively and complete idle stroke by this.Idle stroke energy consumption of the present invention is little, easily manufactures, easy to maintenance.
Description
Technical field
The present invention relates to the press with hydraulic plunger, particularly relate to a kind of toggle link idle stroke energy-saving hydraulic press.
Background technology
In prior art, the master cylinder idle stroke of Long travel direct press type hydraulic press is relatively long, generally reaches about 4/5 of whole impulse stroke.During work, hydraulic cylinder, first through idle stroke, just starts real pressing process when touching workpiece.When press fast downlink, master cylinder must adopt the repairing of large discharge prefill valve to ensure downstream rate, and because master cylinder volume is large during pressurization, hydraulic oil compression causes suitable energy loss with expansion and frame elastic deformation.
For solving above-mentioned technical problem, the main thought of prior art is that the course of work is divided into main-cylinder stroke and auxiliary cylinders stroke two sections, in pressure process, idle stroke is completed by auxiliary cylinders, then the space between the master cylinder adopting the way of machinery compensation idle stroke to cause and beam, final master cylinder pressurization execution.
Due in this kind of press structure, drive the master cylinder of walking beam only need ensure the impulse stroke of hydraulic press, master cylinder stroke shortens greatly.Simultaneously because master cylinder volume reduces greatly, the hydraulic power oil volume of hydraulic oil compression-expansion consumption when master cylinder pressurization and release also reduces widely, reduces energy consumption, correspondingly reduces the power of main oil pump and the accumulator volume as supplementary energy.More existing solutions are as follows:
As CN101062598 master cylinder adopts double-head piston, piston rod hollow, cylindricality tooth bar passes through piston rod, after auxiliary cylinders stroke terminates, adopts mechanical device to hold cylindricality tooth bar tightly, compensates idle stroke.Its shortcoming adopts double-head piston that master cylinder effective area is reduced.
As ZL03258511.X and 03258513.6 adopts master cylinder inverted structure, during upper limit, cylinder piston portion stretches into upper beam, and after auxiliary cylinders stroke terminates, the baffle plate of upper beam stretches out, and compensates the gap between main oil cylinder piston and upper beam of being caused by idle stroke.Its shortcoming is that master cylinder is not fixed, and hydraulic hose is in active state makes it be difficult to arrange, and the life-span of hydraulic hose will significantly shorten;
As mentioned above, thisly in prior art the main and auxiliary mode of oil cylinder alternation that helps is utilized to bring following several weak point: hydraulic system is complicated, running easy break-down, the energy consumption of auxiliary cylinder is still not little, proposes higher requirement to the manufacture of hydraulic system and maintenance.
Summary of the invention
The object of the invention is to overcome weak point of the prior art, and provide a kind of hydraulic system relatively simple, idle stroke energy consumption is less, the toggle link idle stroke energy-saving hydraulic press easily manufacturing, safeguard.
The object of the invention is to be realized by following approach.
Toggle link idle stroke energy-saving hydraulic press, comprise press frame, moved cross beam, master cylinder and guiding mechanism, moved cross beam is placed between the entablature of press frame and sill, can move up and down along guiding mechanism, master cylinder is placed on entablature, press has impulse stroke and idle stroke, wherein impulse stroke is completed by master cylinder, its composition main points are, also include elbow-bar mechanism and toggle link drive unit, it is symmetrical along press center line that elbow-bar mechanism has two pairs, and another termination of two elbow arm up and down of every secondary elbow-bar mechanism is connected with master cylinder plunger end and moved cross beam respectively, this connects or directly links or undertaken hinged by transition member, between two secondary elbow-bar mechanism, horizontal cross-over connection has toggle link drive unit, cross-over connection place is hinged, oil cylinder or cylinder is included in toggle link drive unit, through the driving of toggle link drive unit, two secondary elbow-bar mechanism or be bent outwardly simultaneously or curve inwardly simultaneously, elbow arm bends with it and stretches the two-end-point up and down of corresponding press idle stroke respectively and complete idle stroke by this.
Like this, toggle link drive unit is relied on to control the bending of two secondary elbow-bar mechanism and stretch to realize idle stroke, in the process, by means of the distinctive expansion power of elbow-bar mechanism and speed characteristics, there is fair speed the incipient stage of falling stroke at the fast speed slows down gradually along with fast travel, in fast lifting stroke after completing pressing process, the maximum requirement meeting knockout press of initial lifting force, improves gradually with hourly velocity.Like this, reduce decline fast, while the impact of lifting process, have again decline faster, hoisting velocity, and energy consumption spent by toggle link drive unit is lower.
Object of the present invention can also be realized by following approach.
Described master cylinder quantity is a plurality of, and the piston end of a plurality of master cylinder connects a tie-beam led by guiding mechanism jointly, and the upper elbow and arm of two secondary elbow-bar mechanism is hinged with this tie-beam respectively.
Like this, the rigid water hammer of multiple master cylinder can just be realized.
Transition member is a kind of transition arm, this transition arm one end and main oil cylinder piston end or moved cross beam affixed, the other end and elbow arm hinged.
Cross-over connection place of toggle link drive unit two ends and elbow-bar mechanism or in elbow arm or in hinge joint place of upper and lower two elbow arm.
The further optimization of toggle link drive unit is, Yi Zhongshi:
Toggle link drive unit is made up of linear drive apparatus, and this linear drive apparatus is the one in oil cylinder, cylinder or electric pushrod, and the elbow-bar mechanism of two ends respectively with corresponding is hinged.
Like this, the flexible elbow-bar mechanism that drives of piston rod bends and stretches.Another kind is:
Toggle link drive unit is made up of linear drive apparatus, cross bar and transiting rod, this linear drive apparatus is the one in oil cylinder, cylinder or electric pushrod, linear drive apparatus or be fixed on moved cross beam or with main oil cylinder piston is connected, its piston rod vertically stretches out along press axis and is connected with horizontal and symmetrical cross bar, cross bar two ends are hinged with a transiting rod respectively, and the symmetrical and transiting rod other end symmetry hinge joint of two identical transiting rods is in the elbow arm of corresponding elbow-bar mechanism or the hinged place of upper and lower two elbow arm.
Like this, piston rod ejects, and drives transiting rod by cross bar, and the transiting rod of swing drives elbow-bar mechanism bend or stretch.
Also comprise the push rod pair of restriction two groups of elbow-bar mechanism minimum ranges, push rod is distributed in two groups of elbow-bar mechanism and two push rods be fixedly connected with elbow arm respectively to comprising, the two elbow arm conllinear up and down of two groups of elbow-bar mechanism or when being in self-locking state, above-mentioned two push rods engage and touch.
Like this, two push rod ends contact when toggle link drive unit drives two groups of elbow-bar mechanism to make upper and lower two elbow arm stretch conllinear or self-locking state, effectively spacing two groups of elbow-bar mechanism in stroke end in the stress of conllinear or self-locking.
Beneficial effect: the present invention utilizes toggle mechanism to achieve fast travel, it is long that hinge structure has fast travel, and there is fair speed the incipient stage of falling stroke at the fast speed slows down gradually along with fast travel, in fast lifting stroke after completing pressing process, the maximum requirement meeting knockout press of initial lifting force, improve gradually with hourly velocity, decrease the impact of quick decline lifting process.
Accompanying drawing explanation
Fig. 1 is the structural representation of toggle link idle stroke energy-saving hydraulic press described in the embodiment of the present invention one;
Fig. 2 is the structural representation of toggle link idle stroke energy-saving hydraulic press described in the embodiment of the present invention two;
Fig. 3 is the structural representation of toggle link idle stroke energy-saving hydraulic press described in preferred embodiment;
In figure:
1. press frame 2. master cylinder 3. toggle link drive unit 3.1 cross bar 3.2 transiting rod 3.3 piston rod 4. guiding mechanism 5. moved cross beam 6. elbow-bar mechanism
6.1 lower elbow and arm 6.2 upper elbow and arm 6.3 transition arm 7. push rod 8. tie-beams.
Detailed description of the invention
Embodiment 1
With reference to Fig. 1, toggle link idle stroke energy-saving hydraulic press, comprise press frame 1, moved cross beam 5, master cylinder 2 and guiding mechanism 4, between the entablature that moved cross beam 5 is placed in press frame 1 and sill, can move up and down along guiding mechanism 4, master cylinder 2 is placed on entablature, press has impulse stroke and idle stroke, wherein impulse stroke is completed by master cylinder 2, also include elbow-bar mechanism 6 and toggle link drive unit 3, it is symmetrical along press center line that elbow-bar mechanism 6 has two pairs, and another termination of two elbow arm 6.1 6.2 up and down of every secondary elbow-bar mechanism is connected with master cylinder 2 plunger end and moved cross beam 5 respectively, this connection is undertaken hinged by transition arm 6.3, this transition arm 6.3 other end and master cylinder 2 piston end or moved cross beam affixed, between two secondary elbow-bar mechanism, horizontal cross-over connection has toggle link drive unit 3, cross-over connection place is hinged, oil cylinder is included in toggle link drive unit 3, through the driving of toggle link drive unit 3, two secondary elbow-bar mechanism 6 are bent outwardly simultaneously, elbow arm bends with it and stretches the two-end-point up and down of corresponding press idle stroke respectively and complete idle stroke by this.
The cross-over connection of toggle link drive unit 3 two ends and elbow-bar mechanism 6 be in upper and lower two elbow arm 6.1 6.2 hinge joint place.
Toggle link drive unit 3 is made up of the cylinder body of oil cylinder and the piston rod 3.3 at two ends, and the elbow-bar mechanism of this two ends piston rod 3.3 respectively with corresponding is hinged.
The push rod 7 also comprising restriction two groups of elbow-bar mechanism 6 minimum ranges is right, push rod is distributed in two groups of elbow-bar mechanism and two push rods 7 be fixedly connected with elbow arm respectively to comprising, the two elbow arm conllinear up and down of two groups of elbow-bar mechanism 6 or when being in self-locking state, above-mentioned two push rods 7 engage and touch.
Like this, two push rod ends contact when toggle link drive unit drives two groups of elbow-bar mechanism to make upper and lower two elbow arm stretch conllinear or self-locking state, effectively spacing two groups of elbow-bar mechanism in stroke end in the stress of conllinear or self-locking.
Like this, elbow-bar mechanism 6 is utilized to realize fast travel, there is fair speed the incipient stage of falling stroke at the fast speed slows down gradually along with fast travel, in fast lifting stroke after completing pressing process, the maximum requirement meeting knockout press of initial lifting force, improve gradually with hourly velocity, decrease the impact of quick decline lifting process.Meanwhile, push rod 7 pairs of ends contact when toggle link drive unit 3 drives two groups of elbow-bar mechanism 6 to make upper and lower two elbow arm 6.1 6.2 stretch conllinear or self-locking state, effectively ensure that two groups of elbow-bar mechanism in stroke end in the stress of conllinear or self-locking.
It is same as the prior art that the present embodiment does not state part.
Embodiment 2
With reference to Fig. 2, toggle link idle stroke energy-saving hydraulic press, is from the different of embodiment 1: have two master cylinders 2 hinged with corresponding elbow-bar mechanism respectively by transition arm 6.3.Two secondary elbow-bar mechanism 6 curve inwardly simultaneously.Toggle link drive unit 3 is made up of oil cylinder, cross bar 3.1 and transiting rod 3.2, oil cylinder is fixed on moved cross beam, its piston rod 3.3 vertically stretches out along press axis and is connected with horizontal and symmetrical cross bar 3.1, cross bar 3.1 two ends are hinged with a transiting rod 3.2 respectively, and symmetrical and transiting rod 3.2 other end symmetry hinge joint of two identical transiting rods 3.2 is on the upper elbow and arm 6.2 of corresponding elbow-bar mechanism 6.Like this, piston rod 3.3 ejects, and drives transiting rod 3.2 by cross bar 3.1, and the transiting rod 3.2 of swing drives elbow-bar mechanism 6 bend or stretch.The cross-over connection of toggle link drive unit 3 two ends and elbow-bar mechanism 6 is on upper elbow and arm 6.2 to be located.Push rod in embodiment one is not set in this embodiment.
It is identical with embodiment one that the present embodiment does not state part,
Most preferred embodiment:
With reference to Fig. 3, toggle link idle stroke energy-saving hydraulic press, is from the different of embodiment 2: the upper elbow and arm 6.2 that the piston end of two described master cylinders 2 connects the secondary elbow-bar mechanism 6 of a tie-beam led by guiding mechanism 48, two is jointly hinged with this tie-beam 8 respectively.The oil cylinder of toggle link drive unit 3 is fixed on tie-beam 8.
It is identical with embodiment two that the present embodiment does not state part.
The operation principle of embodiment 1,2 and most preferred embodiment 3 is as follows:
The closing stroke of hydraulic press: first by the hydraulic cylinder action of toggle link drive unit 3, drive elbow-bar mechanism to stretch until upper and lower two elbow arm 6.1 6.2 stretch conllinear or self-locking state, moved cross beam 5 fast downlink, completes idle stroke simultaneously.After elbow-bar mechanism 6 is stretched, upper and lower mould, close to closure state, now carries out short distance pressurization by master cylinder, realizes large-tonnage press power.
The opening stroke of hydraulic press: first master cylinder 2 pressure release, then overcome the bonding force of upper and lower mould by elbow-bar mechanism 6 action and drive the backhaul of moved cross beam 5 short distance, finally reclaimed by the elbow arm of the Driven by Hydraulic Cylinder elbow-bar mechanism of toggle link drive unit 3, overlapping, make moved cross beam 5 rapid movement to press original position.
Claims (8)
1. toggle link idle stroke energy-saving hydraulic press, comprise press frame, moved cross beam, master cylinder and guiding mechanism, moved cross beam is placed between the entablature of press frame and sill, can move up and down along guiding mechanism, master cylinder is placed on entablature, press has impulse stroke and idle stroke, wherein impulse stroke is completed by master cylinder, it is characterized in that, also include elbow-bar mechanism and toggle link drive unit, it is symmetrical along press center line that elbow-bar mechanism has two pairs, and another termination of two elbow arm up and down of every secondary elbow-bar mechanism is connected with master cylinder plunger end and moved cross beam respectively, this connects or directly links or undertaken hinged by transition member, between two secondary elbow-bar mechanism, horizontal cross-over connection has toggle link drive unit, cross-over connection place is hinged, oil cylinder or cylinder is included in toggle link drive unit, through the driving of toggle link drive unit, two secondary elbow-bar mechanism or be bent outwardly simultaneously or curve inwardly simultaneously, elbow arm bends with it and stretches the two-end-point up and down of corresponding press idle stroke respectively and complete idle stroke by this.
2. toggle link idle stroke energy-saving hydraulic press according to claim 1, it is characterized in that, described master cylinder quantity is a plurality of, and the piston end of a plurality of master cylinder connects a tie-beam led by guiding mechanism jointly, and the upper elbow and arm of two secondary elbow-bar mechanism is hinged with this tie-beam respectively.
3. toggle link idle stroke energy-saving hydraulic press according to claim 1, is characterized in that, transition member is a kind of transition arm, this transition arm one end and main oil cylinder piston end or moved cross beam affixed, the other end and elbow arm hinged.
4. toggle link idle stroke energy-saving hydraulic press according to claim 1, is characterized in that, cross-over connection place of toggle link drive unit two ends and elbow-bar mechanism or in elbow arm or in hinge joint place of upper and lower two elbow arm.
5. the toggle link idle stroke energy-saving hydraulic press according to claim 1 or 4, it is characterized in that, toggle link drive unit is made up of linear drive apparatus, and this linear drive apparatus is the one in oil cylinder, cylinder or electric pushrod, and the elbow-bar mechanism of two ends respectively with corresponding is hinged.
6. the toggle link idle stroke energy-saving hydraulic press according to claim 1 or 4, it is characterized in that, toggle link drive unit is by linear drive apparatus, cross bar and transiting rod composition, this linear drive apparatus is oil cylinder, one in cylinder or electric pushrod, linear drive apparatus or be fixed on moved cross beam or with main oil cylinder piston is connected, its piston rod vertically stretches out along press axis and is connected with horizontal and symmetrical cross bar, cross bar two ends are hinged with a transiting rod respectively, symmetrical and the transiting rod other end symmetry hinge joint of two identical transiting rods is in the elbow arm of corresponding elbow-bar mechanism or the hinged place of upper and lower two elbow arm.
7. toggle link idle stroke energy-saving hydraulic press according to claim 1, it is characterized in that, described master cylinder quantity is a plurality of, the piston end of a plurality of master cylinder connects a tie-beam led by guiding mechanism jointly, the upper elbow and arm of two secondary elbow-bar mechanism is hinged with this tie-beam respectively, toggle link drive unit is by oil cylinder or cylinder, cross bar and transiting rod composition, oil cylinder or cylinder are fixed on tie-beam, its piston rod vertically stretches out along press axis and is connected with horizontal and symmetrical cross bar, cross bar two ends are hinged with a transiting rod respectively, symmetrical and the transiting rod other end symmetry hinge joint of two identical transiting rods is in the elbow arm of corresponding elbow-bar mechanism or the hinged place of upper and lower two elbow arm.
8. toggle link idle stroke energy-saving hydraulic press according to claim 1, it is characterized in that, also comprise the push rod pair of restriction two groups of elbow-bar mechanism minimum ranges, push rod is distributed in two groups of elbow-bar mechanism and two push rods be fixedly connected with elbow arm respectively to comprising, the two elbow arm conllinear up and down of two groups of elbow-bar mechanism or when being in self-locking state, above-mentioned two push rods engage and touch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310242643.2A CN103286970B (en) | 2013-06-18 | 2013-06-18 | Toggle link idle stroke energy-saving hydraulic press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310242643.2A CN103286970B (en) | 2013-06-18 | 2013-06-18 | Toggle link idle stroke energy-saving hydraulic press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103286970A CN103286970A (en) | 2013-09-11 |
| CN103286970B true CN103286970B (en) | 2015-12-02 |
Family
ID=49088744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310242643.2A Active CN103286970B (en) | 2013-06-18 | 2013-06-18 | Toggle link idle stroke energy-saving hydraulic press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103286970B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105082592B (en) * | 2015-08-31 | 2016-08-24 | 西安交通大学 | The quickly servo-pressing machine of the mair motor translational symmetry toggle link of idle running supercharging at a slow speed |
| CN105081044B (en) * | 2015-08-31 | 2017-04-19 | 西安交通大学 | Hydraulic toggle rod type stretching pad capable of achieving overall horizontal motion of dual-shaft-extension permanent magnet synchronous servo motor |
| CN105538762A (en) * | 2015-12-14 | 2016-05-04 | 江苏华海钢结构有限公司 | Toggle type straightening press machine |
| CN107364163B (en) * | 2017-09-05 | 2023-06-02 | 嘉兴大道锻造技术咨询有限公司 | Multifunctional hydraulic press |
| CN108015141A (en) * | 2017-12-12 | 2018-05-11 | 嘉兴大道锻造技术咨询有限公司 | One kind supercharging toggle punching machine |
| CN108297249A (en) * | 2018-03-30 | 2018-07-20 | 佛山市恒力泰机械有限公司 | A kind of brick machine with stroke compensating mechanism |
| CN108621284A (en) * | 2018-03-30 | 2018-10-09 | 佛山市恒力泰机械有限公司 | A kind of more frame brick machines with stroke compensating mechanism |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203317761U (en) * | 2013-06-18 | 2013-12-04 | 福建海源自动化机械股份有限公司 | Elbow blank stroke energy-saving hydraulic press |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0246995A (en) * | 1988-08-04 | 1990-02-16 | Hisao Yamashina | Plate working machine |
| JP5286923B2 (en) * | 2008-05-14 | 2013-09-11 | トヨタ車体株式会社 | Press machine |
| CN201471735U (en) * | 2009-05-15 | 2010-05-19 | 南通锻压设备有限公司 | Hydraulic punching machine |
-
2013
- 2013-06-18 CN CN201310242643.2A patent/CN103286970B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203317761U (en) * | 2013-06-18 | 2013-12-04 | 福建海源自动化机械股份有限公司 | Elbow blank stroke energy-saving hydraulic press |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103286970A (en) | 2013-09-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103286970B (en) | Toggle link idle stroke energy-saving hydraulic press | |
| CN105751560B (en) | Long stroke wedge-type energy-saving hydraulic machine and its method of work | |
| CN201493367U (en) | Hydraulic punching machine | |
| CN203317761U (en) | Elbow blank stroke energy-saving hydraulic press | |
| CN102744768A (en) | Hydraulic brick discharge machine | |
| CN102320075A (en) | Refractory brick double-mould forming machine | |
| CN107138603B (en) | Hydraulic side blow aperture apparatus | |
| CN210031800U (en) | Buffer gear of pile driver | |
| CN204770612U (en) | Steel ingot stripper | |
| CN204724756U (en) | Pin bender cut by pneumatic type double-pole | |
| CN104324998B (en) | A kind of drawing die with variable blank holding pressure tool with automatic control function | |
| CN204247793U (en) | A kind of drawing die with variable blank holding pressure tool with automatic control function | |
| CN103418728A (en) | Upper die moving platform for large forging press | |
| CN202639147U (en) | Transistor forming die assembly and transistor forming device | |
| CN203470598U (en) | Pre-clamping device | |
| CN205988975U (en) | A kind of pipe straightener | |
| CN201950205U (en) | Hydraulic zinc-ingot stripper | |
| CN204524034U (en) | A kind of novel hydraulic Wedge mechanism | |
| CN208776207U (en) | A kind of fixture that single driving three-dimensional is mobile | |
| CN203679098U (en) | Special lifting lug bending forming device for smelting | |
| CN202162320U (en) | Silent hammer | |
| CN204526198U (en) | A kind of simple pendulum arm hydraulic press | |
| CN202213033U (en) | Full-automatic block forming machine | |
| CN216737538U (en) | High-efficient liquid filling machine of laundry detergent | |
| CN106368995B (en) | Electrichydraulic control press with feeding function of increasing pressure and backhaul pressure holding function |
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 |