CN201322017Y - Air pressure balance type end cover for direct-acting type electro hydraulic servo valve - Google Patents
Air pressure balance type end cover for direct-acting type electro hydraulic servo valve Download PDFInfo
- Publication number
- CN201322017Y CN201322017Y CNU2008201569823U CN200820156982U CN201322017Y CN 201322017 Y CN201322017 Y CN 201322017Y CN U2008201569823 U CNU2008201569823 U CN U2008201569823U CN 200820156982 U CN200820156982 U CN 200820156982U CN 201322017 Y CN201322017 Y CN 201322017Y
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- Prior art keywords
- filter screen
- end cap
- air pressure
- air
- hole
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Abstract
The utility model relates to an air pressure balance type end cover for direct-acting type electro hydraulic servo valves, which comprises an improved air pressure balance type end cover, a clamp ring arranged in the through hole, a filter screen component, a filter screen mounting frame and a sealing gasket, wherein the main body of the improved air pressure balance type end cover is a ladder-shaped end cover body with a through hole formed at the middle part. The prior closed space is communicated with atmosphere; the filter screen component ensures air entering a pilot valve is clean, thereby solving the problem of large original zero bias caused by bad internal heat radiation and greatly prolonging the on-line service lift of the pilot servo valve. The utility model is applicable to various direct-acting type electro hydraulic servo valves.
Description
Technical field
The utility model relates to the element of servomotor control system, relates to a kind of control gear that is applicable to the automatically controlled guide's servovalve on the hydraulic control servomotor more specifically, and described air pressure balanced-type end cap is applied to straight ejector half electrohydraulic control.
Background technique
Hydraulic control at present be unable to do without control units such as servovalve, for example the hot rolling technology in the iron and steel production field just is applied to straight ejector half electrohydraulic control, the servovalve of this type has the function of complete electric feedback, secondary drive, two closed loop controls, belong to a kind of of electrohydraulic control, but at present the electrohydraulic control of using is because of its reasons in structure, the problem below concrete existence the behind the breakdown maintenance:
(1) summer in winter, the temperature difference was big, and machine original zero is bigger than normal on the servovalve of repairing:
The inside of the servovalve end cap of original technology is that the mechanical zero of pilot valve is adjusted screw, so this end cap is installed end cap at last again after all technical parameter adjustment of servovalve finish, before not using the air pressure balance end cap, servovalve after adjust summer in winter is at the big seasonal machine of the temperature difference, servovalve original zero bigger than normal.And the zero of servovalve is a main index of machine function under the reflection servovalve partially.
(2) repair the servovalve of adjusting and to occur zero after placement a period of time partially
Generally occur above-mentioned situation in the servovalve after repairing, be difficult to overcome.
(3) cycle that uses on the machine of servovalve is short:
The milling train servocontrol is to lean on the performance of servovalve to guarantee, being divided into back flow side and active side controls synchronously and separately, the performance difference of two servovalves also is a key link of depressing the control accuracy difference, degradation trend is fast partially for servovalve zero, when two servovalve zero-deviations different when big, the servovalve that must change zero side bigger than normal guarantees the control accuracy of servo-system, and regular replacing makes servovalve have the short situation of life cycle.
By the analysis of the problems referred to above, draw electrohydraulic control exist zero bigger than normal be the main reason that causes life cycle short, the reason of its generation is as described below:
Direct drive type electro-hydraulic servo valve (as shown in Figure 1) expands after wherein air is heated, and can't discharge under the structure at present, cause in the servovalve control procedure, when positive V-C electric current is loaded on the coil, just produce a spool of magnetic force promotion to the right and move right, negative V-C electric current action is opposite.Because the response of direct-acting type valve actuation attitude is high, end cap just produces a sealed gas chamber after installing, thereby communicate part, coil internal surface gap in the end cap space and with connecting rod, there is residual air, the heat of magnet steel and coil generation simultaneously expands the gas in the air chamber, the driving force fluctuation that spool is moved is big, causes pilot valve to use zero inclined to one side degradation trend fast at machine.And the servovalve that former factory produces can also guarantee zero inclined to one side numerical value in small range before not working as yet, but the problems referred to above will occur after work a period of time.
So press for now and a kind ofly can overcome original technology with the servovalve problem that dress back produces of disintegrating back, the adjustment temperature that also can solve servovalve simultaneously influences last machine zero drift, avoided driving force fluctuation that valve core of servo valve moves to cause on the servovalve machine zero drift greatly to the influence of hydraulic control, be that temperature variation does not have influence partially to zero of servovalve, also can effectively prolong the cycle and the method for life of the online use of servovalve simultaneously.
The model utility content
Deal with problems for above-mentioned, the utility model is by behind the structure post analysis to servovalve, structural type change with end cap, a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control is provided, can effectively regulate and control the gentle indoor expanding gas of heat of magnet steel and coil generation, overcome original technology with the servovalve problem that dress back produces of disintegrating back, the adjustment temperature that also can solve servovalve simultaneously influences last machine zero drift, promptly avoided driving force fluctuation that valve core of servo valve moves to cause greatly that the machine zero drift is to the influence of hydraulic control on the servovalve, there is not this problem in the servovalve after yet guaranteeing to repair.
Concrete structure of the present utility model is as described below:
A kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control comprises guide's servovalve body, it is characterized in that:
On the gas circuit of described guide's servovalve body one middle side part the air pressure balanced-type end cap is installed;
Described air pressure balanced-type end cap comprises that the middle part forms the stepped end cap body of through hole, is arranged at snap ring, screen modules, filter screen scaffold and sealing gasket in the through hole;
Described snap ring is installed in end cap body inner via hole inner edge outer end, and blocks the filter screen scaffold that is installed in other end in the end cap through hole equally, by inboard, through hole lateral screen modules is set in this filter screen scaffold.
The effect of screen modules is the air cleaner that guarantees to enter in the pilot valve.
According to a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control of the present utility model, it is characterized in that: the through hole that described middle part forms the stepped end cap body of through hole is round.
Circular stepped end cap body and through hole make things convenient for installation and removal.
According to a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control of the present utility model, it is characterized in that: described screen modules is the smaller air first road filter screen, the air second road filter screen and air the 3rd road filter screen of ratio filter screen scaffold diameter that is provided with by the inboard order in the through hole lateral of the stepped end cap body of through hole.
The filter screen diameter is more smaller than filter screen scaffold, makes to need only when cleaning snap ring is taken out, and loads onto after 3 filter screens taking-ups are cleaned to get final product.
According to a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control of the present utility model, it is characterized in that: the filter screen density of the described air first road filter screen, the air second road filter screen and air the 3rd road filter screen increases progressively successively.
Filter screen has three layers, wherein air the 3rd road filter screen of the air second road filter screen of the air first road filter screen of granularity 20um, granularity 10um and granularity 5um preferably
According to a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control of the present utility model, it is characterized in that: the described air first road filter screen, the air second road filter screen, air the 3rd road filter screen and the also available supporting filter screen of filter screen scaffold and filter screen shell replace using.
As use the filter screen of integrally-built 10um filter precision, the disposable scheme of ancillary filter net shell has made things convenient for dismounting, has improved the online life cycle of guide's servovalve greatly.。
According to a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control of the present utility model, it is characterized in that: described sealing gasket is mounted on the step portion that the filter screen scaffold contacts with the stepped end cap body of through hole.
Sealing gasket prevent that air from directly entering the inner and equipment failure that causes of servovalve without filter screen.
Use the utility model to obtain following beneficial effect:
1. use of the present utility modelly to be applied to straight ejector half electrohydraulic control and can to judge true and false zero zero drift that causes partially, false zero is that V-C, P-SIG, P-FB etc. have an identical side-play amount partially, can make servovalve recover good state by adjusting.
2. solved the defective of original technology gas spring by improvement and improved the shortcoming of internal heat dissipating difference, and very zero part bigger than normal is caused greatly due to the expansion that gas is heated in the pilot valve end cap by temperature contrast end cover structure.
3. use the air pressure balanced-type end cap that is applied to straight ejector half electrohydraulic control of the present utility model, numerical value is very little partially to make on the servovalve machine original zero, and degradation trend is tending towards relaxing in using, and promptly the online life cycle of servovalve improves greatly.
Description of drawings:
Fig. 1 is the concrete schematic representation of the problem of guide's servovalve structure under the prior art and existence;
Fig. 2 is the concrete structure schematic representation that guide's servovalve of the air pressure balanced-type end cap that is applied to straight ejector half electrohydraulic control of the present utility model has been installed;
Fig. 3 is the concrete structure schematic representation that is applied to the air pressure balanced-type end cap of straight ejector half electrohydraulic control of the present utility model;
Fig. 4 is the filter structure schematic representation that is applied to the air pressure balanced-type end cap of straight ejector half electrohydraulic control of the present utility model;
Fig. 5 is the use filter screen of the air pressure balanced-type end cap that is applied to straight ejector half electrohydraulic control of the present utility model and the structural representation of filter screen case member.
Among the figure, 1-guide's servovalve body, 2-air pressure balanced-type end cap, the 3-gas circuit, the 4-middle part forms the stepped end cap body of through hole, 5-snap ring, the 6-air first road filter screen, the 7-air second road filter screen, 8-air the 3rd road filter screen, 9-filter screen scaffold, the 10-sealing gasket, the 11-filter screen, 12-filter screen shell, the end cap of 13-prior art.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further:
As shown in Figures 2 and 3, make the end cap 13 of the old-fashioned sealed type pilot valve of the connection gas circuit 3 of prior art into air pressure balanced-type end cap 2, mainly form the stepped end cap body 4 and the screen modules of through hole by new-type middle part, screen modules is air first road filter screen 6 air, second road filter screen 7 and air the 3rd road filter screen 8 that the ecto-entad of order is provided with, its density increases progressively successively, screen modules is installed on the filter screen scaffold 9, snap ring 5 blocks the filter screen scaffold and is fixed and is stuck, in addition, the filter screen scaffold is equipped with sealing gasket 10 with the step portion that the stepped end cap body of through hole contacts.
Filter screen scaffold and screen modules have solved the defective that original technology exists, being about to original confined space becomes with atmosphere and communicates, and the effect of screen modules is the air cleaner that guarantees to enter in the pilot valve, filter screen has three layers, as shown in Figure 4, filter screen second road with the thin filter screen of granularity 5um at last among granularity 20um coarse filtration net first road, the granularity 10um, this kind structure has the high advantage of filter precision, the cleaning and filtering net is convenient, as long as snap ring is taken out, get final product loading onto after 3 filter screens taking-up cleanings.
As shown in Figure 5, on the basis of the foregoing description, the air first road filter screen 6, the air second road filter screen 7, air the 3rd road filter screen 8 and filter screen scaffold 9 are replaced to matching used filter screen 11 and filter screen shell 12, this filter screen device adopts the overall structure formula, filter precision is granularity 10um, adopt the disposable scheme of installing and using, made things convenient for dismounting, improved the online life cycle of guide's servovalve greatly.
Use the air pressure balanced-type end cap that is applied to straight ejector half electrohydraulic control of the present utility model, as long as the temperature when servovalve adjusted is adjusted under 45 ℃ of same temperature, also just can not exist seasonal temperature to change and bring to such an extent that the original zero inclined to one side servovalve that is brought uses on the machine short problem of time.
Not only the utility model can be used for straight ejector half electrohydraulic control field, also can depress in the roughing in the press down system of hot-strip finish rolling, edger roll side pressure and coiling machine Hydrauservo System field, by using, fully prove substantive distinguishing features and remarkable progress that it is outstanding, obtain remarkable economic efficiency, had advantages of high practicability and promotional value.
Claims (6)
1. an air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control comprises guide's servovalve body (1), it is characterized in that:
On the gas circuit (3) of described guide's servovalve body (1) one middle side part air pressure balanced-type end cap (2) is installed;
Described air pressure balanced-type end cap (2) comprises that the middle part forms the stepped end cap body (4) of through hole, is arranged at snap ring (5), screen modules, filter screen scaffold (9) and sealing gasket (10) in the through hole;
Described snap ring (5) is installed in stepped end cap body (4) the inner via hole inner edge outer end that the middle part forms through hole, and block the filter screen scaffold (9) that is installed in other end in the end cap through hole equally, in this filter screen scaffold, screen modules is set by inboard, through hole lateral.
2. a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control as claimed in claim 1 is characterized in that: the through hole that described middle part forms the stepped end cap body (4) of through hole is round.
3. a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control as claimed in claim 1 is characterized in that: described screen modules is one to form the air first road filter screen (6) more smaller than filter screen scaffold (5) diameter, the air second road filter screen (7) and air the 3rd road filter screen (8) that the inboard order in through hole lateral of the stepped end cap body (4) of through hole is provided with by the middle part.
4. a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control as claimed in claim 3 is characterized in that: the filter screen density of the described air first road filter screen (6), the air second road filter screen (7) and air the 3rd road filter screen (8) increases progressively successively.
5. a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control as claimed in claim 3 is characterized in that: the described air first road filter screen (6), the air second road filter screen (7), air the 3rd road filter screen (8) and the also available supporting filter screen of filter screen scaffold (9) (11) and filter screen shell (12) replace using.
6. a kind of air pressure balanced-type end cap that is used for straight ejector half electrohydraulic control as claimed in claim 1 is characterized in that: described sealing gasket (10) is mounted on the step portion that filter screen scaffold (9) contacts with the stepped end cap body (4) of through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201569823U CN201322017Y (en) | 2008-12-12 | 2008-12-12 | Air pressure balance type end cover for direct-acting type electro hydraulic servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201569823U CN201322017Y (en) | 2008-12-12 | 2008-12-12 | Air pressure balance type end cover for direct-acting type electro hydraulic servo valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201322017Y true CN201322017Y (en) | 2009-10-07 |
Family
ID=41159401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201569823U Expired - Fee Related CN201322017Y (en) | 2008-12-12 | 2008-12-12 | Air pressure balance type end cover for direct-acting type electro hydraulic servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201322017Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790880A (en) * | 2012-11-05 | 2014-05-14 | 中国科学院沈阳自动化研究所 | Underwater hydraulic servo valve pressure compensation structure |
| CN108027079A (en) * | 2015-09-08 | 2018-05-11 | 日立汽车系统株式会社 | Solenoid valve, hydraulic control device and brake apparatus |
| CN109268330A (en) * | 2018-11-06 | 2019-01-25 | 襄阳航宇机电液压应用技术有限公司 | A kind of offset-type serving volume valve |
-
2008
- 2008-12-12 CN CNU2008201569823U patent/CN201322017Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790880A (en) * | 2012-11-05 | 2014-05-14 | 中国科学院沈阳自动化研究所 | Underwater hydraulic servo valve pressure compensation structure |
| CN103790880B (en) * | 2012-11-05 | 2016-04-13 | 中国科学院沈阳自动化研究所 | A kind of underwater hydraulic servovalve pressure compensation structure |
| CN108027079A (en) * | 2015-09-08 | 2018-05-11 | 日立汽车系统株式会社 | Solenoid valve, hydraulic control device and brake apparatus |
| CN109268330A (en) * | 2018-11-06 | 2019-01-25 | 襄阳航宇机电液压应用技术有限公司 | A kind of offset-type serving volume valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20091007 Termination date: 20161212 |