CN202768514U - Balance valve suitable for oil cylinder system - Google Patents
Balance valve suitable for oil cylinder system Download PDFInfo
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- CN202768514U CN202768514U CN201220413154.XU CN201220413154U CN202768514U CN 202768514 U CN202768514 U CN 202768514U CN 201220413154 U CN201220413154 U CN 201220413154U CN 202768514 U CN202768514 U CN 202768514U
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Abstract
The utility model discloses a balance valve suitable for an oil cylinder system. The balance valve comprises a valve sleeve, a main valve core located in the valve sleeve, and a one-way valve core located in the main valve core. The valve sleeve is provided with a first main oil port and a second main oil port, wherein the first main oil port is communicated with a front cavity of a one-way valve, and the second main oil port is communicated with a back valve of the one-way valve and a front cavity and a back cavity of a main valve. The back cavity of the main valve is provided with a main spring abutting against the main valve core, the front cavity of the main valve is provided with a control cylinder body connected with the valve sleeve, the tail portion of a control valve core can slide in a cylinder hole in the control cylinder body, the head portion of the control valve core is connected with the main valve core, and the head portion of the control valve core abuts against a spring of the one-way valve. The balance valve is characterized in that the inner wall of the cylinder hole in the control cylinder body is provided with a shoulder which protrudes inwards and is matched with the tail portion of the control valve core. Due to adoption of the structure, the shoulder can be in contact with the control valve core, a contact face of the cylinder hole and the control valve core is shortened, machining is convenient, meanwhile form and location tolerance can be guaranteed, the qualified rate of parts can also be improved, and good practicability is achieved.
Description
Technical field
The utility model relates to a kind of field of hydraulic control, is specifically related to a kind of equilibrium valve that is applicable to cylinder system.
Background technique
At present equilibrium valve has been widely used in the oil cylinder hydraulic system of shear leg of the constructional engineering machineries such as truck crane, tower crane, high-altitude operation vehicle, municipal engineering machinery, play the effect at an arbitrary position of locking cylinder piston rod, simultaneously can control again cylinder piston rod bounces back reposefully, thereby equilibrium valve is the crucial hydraulic element on the heavy duty crane, also is one of element important in the hydraulic pressure manufacturing product
Equilibrium valve can be divided into the equilibrium valve that equilibrium valve that externally connected type connects is connected with plug-in type with installation form, after this traditional class equilibrium valve and engineering machinery support the use, often expose the defectives such as the large and temperature rise of poor reliability, liquid resistance is fast, it is poor that wherein poor reliability mainly is reflected in latch-up characteristic, cause the reason of this drawback to be: it is unreasonable that equilibrium valve unlatching spool opens and closes the chamfering structure design, and the spring fatigue distortion institute that does not make corresponding construction optimization and equilibrium valve causes.Cause liquid resistance reason large, that temperature rise is fast then to be: nonreturn valve core and balance valve core arrange respectively, and small product size is large, and runner is many, and the liquid resistance is high.This makes to load on decline process generation low-frequency jitter phenomenon, grievous injury host computer system and harm operator's personal safety so that oil cylinder equilibrium valve opening in descending process is difficult to be stabilized on the definite openings of sizes.
For this reason, the equilibrium valve that people design makes new advances comes, and number is CN1133821C " a kind of equilibrium valve " such as the Chinese patent notice of authorization, and pilot valve and balance valve core place on the same level axis in this equilibrium valve, have reduced the spatial volume of product, and good reliability.But in this equilibrium valve, because the control cylinder body is longer with control plug fit dimension, in order to guarantee form and position tolerance, the machining accuracy of control cylinder body certainly will be to improved, thereby processing cost can be improved, even and if like this, form and position tolerance also is difficult to reach requirement usually, therefore also can improve the scrappage of part.Simultaneously, the anterior periphery of the main valve plug of corresponding control plug is smooth surface, and after valve pocket cooperated, in the balance valve core course of action, the hydraulic lock resistance was large, and this can affect the normal movement of balance valve core to a certain extent.
The model utility content
Technical problem to be solved in the utility model is the present situation for prior art, and a kind of processing and high equilibrium valve that is applicable to cylinder system of part up-to-standard rate of being easy to is provided.
The utility model solves the problems of the technologies described above the technological scheme that adopts: the equilibrium valve that is applicable to cylinder system, comprise valve pocket, be positioned at the main valve plug of valve pocket and be positioned at main valve plug and with the nonreturn valve core of the coaxial setting of main valve plug, have on the described valve pocket the first main hydraulic fluid port of being connected with the one-way valve ante-chamber and with the one-way valve back cavity, before the main valve, the second main hydraulic fluid port that back cavity is connected, be provided with the main spring that offsets with described main valve plug in the back cavity of described main valve, be provided with the control cylinder body that links to each other with described valve pocket in the described main valve ante-chamber, the afterbody of control spool can slide in the cylinder hole of this control cylinder body, the head of described control spool links to each other with described main valve plug, and head and the check valve spring of this control spool offset, and it is characterized in that: the shoulder that the cylinder hole inwall of described control cylinder body has inwardly protruding and matches with described control spool afterbody.
Preferably, on the main valve plug end surface that connects described control spool, along circumferentially having a plurality of balancing slits, utilize this balancing slit, can effectively reduce the hydraulic lock resistance in the main valve plug course of action.
In above-mentioned each scheme, described main valve plug surface can be provided with the skewed slot that matches with control mouth on the valve pocket, the Section Design of described skewed slot becomes the structure that diminishes gradually to the back cavity side from described main valve ante-chamber, cooperate with the common of main spring by such skewed slot, can improve the keying smooth performance of product.
Preferably, described main spring is the cluster spring that the inner spring that do not wait of rigidity and outer spring consist of, and can promote equally the keying stationarity that equilibrium valve is opened.
Be preferably, have the oilhole that is communicated with described one-way valve back cavity and main valve ante-chamber on the described control spool, in described oilhole, damping plug is installed.Can have the oil circuit that is communicated with described one-way valve ante-chamber and main valve back cavity on the described main valve plug, be provided with damping in the described oil circuit.Described valve pocket can be plugged in the valve body, and the two ends of this valve body are fixed with respectively end cap, has the long and narrow oil circuit in the cylinder hole that is communicated with control port and described control cylinder body on the end cap of contiguous control cylinder body.By liquid bridge coupling, eliminate the low-frequency jitter in the oil cylinder decline process, make to run more secure, reliable.
Compared with prior art, because the utility model has been set up shoulder at cylinder hole inwall, this shoulder is contacted with the control spool, thereby can shorten cylinder hole and the surface of contact of controlling spool, it is comparatively convenient to process like this, simultaneously form and position tolerance can be guaranteed, also the up-to-standard rate of part can be improved, therefore have preferably practicability.
Description of drawings
Fig. 1 is the utility model embodiment's structural representation;
Fig. 2 is the plan view of main valve plug among Fig. 1;
Fig. 3 is the sectional view of control cylinder body among Fig. 1.
Embodiment
Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.
As shown in Figure 1 to Figure 3, this equilibrium valve includes main valve 1 and one-way valve 2, wherein main valve includes the valve body 11 of tubulose, be plugged on valve pocket 12 and the main valve plug 13 that is positioned at valve pocket in the valve body, the two ends of valve body are fixed with left end cap 14 and right end cap 15, the parts such as valve pocket are enclosed in the cavity of valve body 11, have the first main hydraulic fluid port A on the valve body 11, the second main hydraulic fluid port B and control port X, wherein the first main hydraulic fluid port A is connected with the ante-chamber a of one-way valve, the second main hydraulic fluid port B and one-way valve back cavity b, main valve ante-chamber c and main valve back cavity d are connected, and control port X is connected with the cylinder hole 31 of following control cylinder body 3 by the long and narrow oil circuit 141 on the left end cap.
Above-mentioned one-way valve 2 is comprised of nonreturn valve core 21 and unidirectional spring 22, it be positioned at main valve plug 13 and with main valve plug 13 coaxial settings.
Be provided with the main spring that offsets with main valve plug among the back cavity d of above-mentioned main valve, in the present embodiment, this main spring is the cluster spring that the inner spring 16 that do not wait of rigidity and outer spring 17 consist of, and can promote the smooth performance that equilibrium valve opens and closes.Be provided with the control cylinder body 3 that links to each other with valve pocket 12 among the ante-chamber c of main valve, the afterbody of control spool 4 can slide in the cylinder hole 31 of this control cylinder body, and the shoulder 32 that has inwardly protruding on the cylinder hole inwall of this control cylinder body 3 and match with control spool 4 afterbodys, utilize this shoulder 32 can shorten control spool 4 and the area of contact of controlling cylinder body 3, and then can reduce the difficulty of processing of control cylinder body 3; The head of control spool 4 then links to each other with main valve plug 13, and the head of this control spool 4 and check valve spring 22 offset., in order realizing being communicated with of main valve ante-chamber c and the second main hydraulic fluid port B, to have the oilhole that is communicated with one-way valve back cavity and main valve ante-chamber at control spool 4 here, damping plug 5 to be installed in oilhole.
Above-mentioned main valve plug 13 surfaces are provided with the skewed slot 131 that matches with control mouth on the valve pocket, and the Section Design of skewed slot becomes autonomous valve ante-chamber c to the structure that back cavity d side diminishes gradually, sees also Fig. 2.The edge circumferentially has a plurality of balancing slits 132 on the main valve plug end surface that is connecting control spool 4 simultaneously, and in the present embodiment, balancing slit has six.And have the oil circuit 133 that is communicated with one-way valve ante-chamber and main valve back cavity at main valve plug, be provided with damping 6 in the oil circuit.
When the present embodiment is used, can be directly installed on the outside of oil cylinder, link to each other with oil cylinder by pipeline.Also can remove valve body, directly be inserted into the head of oil cylinder.Therefore install comparatively flexibly, conveniently.
Working principle when the present embodiment is applied to cylinder system is as follows: when the first main hydraulic fluid port cut-in pressure oil, because the first main hydraulic fluid port is to be communicated with the one-way valve ante-chamber, therefore this pressure oil enters into the one-way valve ante-chamber, and promotion nonreturn valve core, make one-way valve opens, fluid flows out from the second main hydraulic fluid port behind the one-way valve back cavity, enters into the rodless cavity of the oil cylinder that connects.The fluid of the second main hydraulic fluid port is respectively through the oil circuit of main valve plug and the oilhole on the control spool simultaneously, enter into front sky and the back cavity of main valve, under the pressure and cluster spring effect of producing according to the difference in areas of main valve front/back cavity, the control mouth that the main valve plug cut-off valve puts makes the fluid on the second main hydraulic fluid port can not flow backward to the first main hydraulic fluid port.
When pressure oil acts on the rod chamber of control port and oil cylinder, the pressure of control port is by the control spool, overcome the pretightening force of main spring, main valve plug is moved to right, open the control mouth, at this moment, fluid in the oil cylinder rodless cavity flows out from the first main oil port through the second main hydraulic fluid port, control mouth, and simultaneously, the fluid of the first main hydraulic fluid port flows into the back cavity of one-way valve, make one-way valve be in closed condition, prevent that the fluid of the first main hydraulic fluid port from flowing back into the second main hydraulic fluid port.
Claims (7)
1. equilibrium valve that is applicable to cylinder system, comprise valve pocket (12), be positioned at the main valve plug (13) of valve pocket and be positioned at main valve plug and with the nonreturn valve core (2) of the coaxial setting of main valve plug, have on the described valve pocket the first main hydraulic fluid port (A) of being connected with one-way valve ante-chamber (a) and with one-way valve back cavity (b), before the main valve, the second main hydraulic fluid port (B) that back cavity is connected, be provided with the main spring that offsets with described main valve plug in the back cavity of described main valve (d), be provided with the control cylinder body (3) that links to each other with described valve pocket in the described main valve ante-chamber (c), the afterbody of control spool (4) can slide in the cylinder hole (31) of this control cylinder body, the head of described control spool links to each other with described main valve plug (13), and the head of this control spool (4) and check valve spring (22) offset, and it is characterized in that: the shoulder (32) that cylinder hole (31) inwall of described control cylinder body has inwardly protruding and matches with described control spool (4) afterbody.
2. the equilibrium valve that is applicable to cylinder system according to claim 1 is characterized in that: on the main valve plug end surface that connects described control spool along circumferentially having a plurality of balancing slits (132).
3. the equilibrium valve that is applicable to cylinder system according to claim 1 and 2, it is characterized in that: described main valve plug surface is provided with the skewed slot (131) that matches with control mouth on the valve pocket, and the Section Design of described skewed slot (131) becomes the structure that diminishes gradually to the back cavity side from described main valve ante-chamber.
4. the equilibrium valve that is applicable to cylinder system according to claim 3 is characterized in that: described main spring is the cluster spring that the inner spring (16) that do not wait of rigidity and outer spring (17) consist of.
5. the equilibrium valve that is applicable to cylinder system according to claim 3 is characterized in that: have the oilhole that is communicated with described one-way valve back cavity and main valve ante-chamber on the described control spool, damping plug (5) is installed in described oilhole.
6. the equilibrium valve that is applicable to cylinder system according to claim 3 is characterized in that: have the oil circuit that is communicated with described one-way valve ante-chamber and main valve back cavity on the described main valve plug, be provided with damping (6) in the described oil circuit.
7. the equilibrium valve that is applicable to cylinder system according to claim 3, it is characterized in that: described valve pocket is plugged in the valve body, the two ends of this valve body are fixed with respectively end cap, have the long and narrow oil circuit (141) in the cylinder hole that is communicated with control port and described control cylinder body on the end cap of contiguous control cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220413154.XU CN202768514U (en) | 2012-08-20 | 2012-08-20 | Balance valve suitable for oil cylinder system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220413154.XU CN202768514U (en) | 2012-08-20 | 2012-08-20 | Balance valve suitable for oil cylinder system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202768514U true CN202768514U (en) | 2013-03-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220413154.XU Expired - Lifetime CN202768514U (en) | 2012-08-20 | 2012-08-20 | Balance valve suitable for oil cylinder system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202768514U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201942A (en) * | 2014-10-24 | 2015-12-30 | 徐州重型机械有限公司 | Balance valve and automobile crane |
| CN106367687A (en) * | 2016-08-30 | 2017-02-01 | 宁波长壁流体动力科技有限公司 | Main valve element |
| CN110725819A (en) * | 2019-08-26 | 2020-01-24 | 宁波江北宇洲液压设备厂 | Flow control type variable amplitude balance valve |
| CN114013417A (en) * | 2021-09-13 | 2022-02-08 | 中国北方车辆研究所 | Constant-proportion pressure distribution valve with variable width of pressure equalizing groove |
-
2012
- 2012-08-20 CN CN201220413154.XU patent/CN202768514U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201942A (en) * | 2014-10-24 | 2015-12-30 | 徐州重型机械有限公司 | Balance valve and automobile crane |
| CN105201942B (en) * | 2014-10-24 | 2019-02-22 | 徐州重型机械有限公司 | Balanced valve and autocrane |
| CN106367687A (en) * | 2016-08-30 | 2017-02-01 | 宁波长壁流体动力科技有限公司 | Main valve element |
| CN110725819A (en) * | 2019-08-26 | 2020-01-24 | 宁波江北宇洲液压设备厂 | Flow control type variable amplitude balance valve |
| CN110725819B (en) * | 2019-08-26 | 2021-07-16 | 宁波宇洲液压设备有限公司 | Flow control type variable amplitude balance valve |
| CN114013417A (en) * | 2021-09-13 | 2022-02-08 | 中国北方车辆研究所 | Constant-proportion pressure distribution valve with variable width of pressure equalizing groove |
| CN114013417B (en) * | 2021-09-13 | 2023-01-13 | 中国北方车辆研究所 | Constant-proportion pressure distribution valve with variable width of pressure equalizing groove |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130306 |