CN103256269A - Manual pilot valve and spool thereof - Google Patents

Manual pilot valve and spool thereof Download PDF

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Publication number
CN103256269A
CN103256269A CN2013101959336A CN201310195933A CN103256269A CN 103256269 A CN103256269 A CN 103256269A CN 2013101959336 A CN2013101959336 A CN 2013101959336A CN 201310195933 A CN201310195933 A CN 201310195933A CN 103256269 A CN103256269 A CN 103256269A
Authority
CN
China
Prior art keywords
spool
frustum
convex shoulder
diameter
oil
Prior art date
Application number
CN2013101959336A
Other languages
Chinese (zh)
Inventor
张志恒
王硕
王小忠
唐宝成
刘建辉
王献岭
牛玉芳
张记方
Original Assignee
平原机器厂(新乡)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 平原机器厂(新乡) filed Critical 平原机器厂(新乡)
Priority to CN2013101959336A priority Critical patent/CN103256269A/en
Publication of CN103256269A publication Critical patent/CN103256269A/en

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Abstract

The invention relates to a manual pilot valve and a spool thereof. The spool comprises a spool body, and an upper convex shoulder is arranged on the spool body, wherein the upper convex shoulder is used for being matched with an upper annular boss arranged between an oil return cavities and a control oil way which correspond to each other in a seal sliding mode. A frustum with the large-diameter upper end and the small-diameter lower end is downwards arranged at the lower end of the upper convex shoulder, the diameter of the large end of the frustum is not larger than the diameter of the upper convex shoulder, the frustum is coaxially arranged with the upper convex shoulder, and an upper throttling groove for communicating the control oil way and the oil return cavity which correspond to each other is formed on the peripheral face of the frustum. By means of the spool, service lives of the spool and a valve body can be prolonged, and stable variation of hydraulic oil mass in the process that the control oil way and the oil return cavity are communicated and cut off can be ensured.

Description

A kind of manual pilot valve and spool thereof

Technical field

The present invention relates to the manual pilot-actuated valve that uses in a kind of engineering machinery.

Background technique

Manually pilot valve is the hydraulic product that is widely used in various engineering machinery and construction machinery equipment, main effect is the commutation of accurately controlling main reversing valve at the hydraulic system medium-long range, and then control the accurate action of executive components such as required oil hydraulic motor and oil cylinder, this type product is widely used in the walking hydraulic control of equipment at present.Existing manual pilot valve such as Chinese patent CN202251182U disclosed " a kind of manual pilot valve ", in comprising, this manual pilot valve is provided with oil back chamber, the valve body of control oil duct and oil suction chamber, also being provided with axis on the valve body extends along the vertical direction, and respectively with oil back chamber, the spool mounting hole that control oil duct and oil suction chamber are communicated with, between oil back chamber and control oil duct, be provided with annular boss on the hole wall of spool mounting hole, between control oil duct and oil suction chamber, be provided with down annular boss on the hole wall of spool mounting hole, on, guiding is coated with spool in the endoporus of following annular boss, be provided with the Handleset that forces spool to move down in the top of spool on the valve body, valve body is provided with and forces the Returnning spring that moves on the spool.Spool is the second order concentric structure that is provided with upper and lower convex shoulder, and the last convex shoulder of spool cooperates with last annular boss slipper seal, and the following convex shoulder of spool cooperates with following annular boss slipper seal, offers throttling groove and following throttling groove on last convex shoulder and the following convex shoulder respectively.Manually the working procedure of pilot valve is: when Handleset is in meta, spool is on the top by action of reset spring power, the following convex shoulder of spool seals oil suction chamber, control hydraulic oil is closed in the oil suction chamber, and the hydraulic oil that enters from the control oil duct flows back to fuel tank through last throttling groove, oil back chamber; Move down when Handleset promotion spool overcomes acting force of the spring, annular boss is sealed and matched on last convex shoulder and the valve body, and control oil duct and oil back chamber are disconnected, thereby throttling groove enters the work of control oil duct realization main valve under the warp of the hydraulic oil in the oil suction chamber.

The problem that existing this manual pilot valve exists is: because last throttling groove arranges on the cylindricality circumferential surface of convex shoulder, move in the process that makes throttling groove connection oil back chamber and control oil duct at spool, can only come conducting control oil duct and oil back chamber by throttling groove, move down in the process that disconnects oil back chamber and control oil duct at spool, the closed process of throttling groove also can be very rapidly, in the process of conducting and disconnection oil back chamber and control oil duct, the flow nonlinear change of hydraulic oil, the changes in flow rate of hydraulic oil is steady inadequately; On the other hand, accumulate in that the foul particle between the annular boss can cause wearing and tearing to the outer circumferential face of spool and the hole wall of spool mounting hole on convex shoulder and the valve body, influence the working life of spool and valve body.

Summary of the invention

The object of the present invention is to provide a kind of working life that can guarantee spool and valve body, can guarantee that again hydraulic-oil quantity changes spool stably in the process of conducting and disconnection oil back chamber and control oil duct; The present invention also aims to provide a kind of manual pilot valve that uses this spool.

In order to address the above problem, the technological scheme of spool is among the present invention:

The spool of manual pilot valve, comprise the spool body, the spool body is provided with for and is arranged on the last annular boss sealed sliding last convex shoulder movingly between corresponding oil back chamber and the control oil duct, the described lower ends downward that goes up convex shoulder convexes with the frustum that upper end diameter is big, lower end diameter is little, the Outside diameter of described frustum is not more than the described diameter of going up convex shoulder, described frustum and the described convex shoulder of going up are coaxially set, and offer the last throttling groove for the corresponding control oil duct of conducting and oil back chamber on the outer circumferential face of described frustum.

The described upward span of throttling groove on above-below direction is not less than the axial height of described frustum.

The Outside diameter of described frustum is less than the described diameter of going up convex shoulder.

The described semicircle that is shaped as that goes up throttling groove.

The technological scheme of hand-operated direction valve is among the present invention:

A kind of manual pilot valve, comprise and be provided with oil back chamber, the valve body of control oil duct and oil suction chamber, valve body is provided with axis and extends along the vertical direction, and be communicated with described oil back chamber, the spool mounting hole of control oil duct and oil suction chamber, between oil back chamber and control oil duct, be provided with annular boss on the hole wall of spool mounting hole, between control oil duct and oil suction chamber, be provided with down annular boss on the hole wall of spool mounting hole, on, guiding is coated with spool in the endoporus of following annular boss, spool comprises the spool body, the spool body be provided be respectively applied to described on, the corresponding sealed sliding of following annular boss movingly on, following convex shoulder, it is big that the described lower ends downward that goes up convex shoulder convexes with upper end diameter, the frustum that lower end diameter is little, the Outside diameter of described frustum is not more than the described diameter of going up convex shoulder, described frustum and the described convex shoulder of going up are coaxially set, and offer the last throttling groove for the corresponding control oil duct of conducting and oil back chamber on the outer circumferential face of described frustum.

The described upward span of throttling groove on above-below direction is not less than the axial height of described frustum.

The Outside diameter of described frustum is less than the described diameter of going up convex shoulder.

The described semicircle that is shaped as that goes up throttling groove.

Beneficial effect of the present invention is: spool is when being on the top, oil suction chamber is by the following convex shoulder shutoff of spool, the control oil duct is by radial clearance and oil back chamber conducting between last throttling groove and frustum and the last annular boss, when needs oil suction chamber and the conducting of control oil duct, Handleset drives spool and moves down, last throttling groove is gradually by shutoff, radial clearance between frustum and the last annular boss is also dwindled gradually simultaneously, radial clearance between frustum and the last annular boss is dwindled gradually the flow of hydraulic oil between control oil duct and the oil back chamber is diminished gradually, the flow of hydraulic oil keeps linear change, changes in flow rate is steady, has reduced the stream group; In like manner, in the process of control oil duct and oil back chamber conducting, the flow of hydraulic oil becomes greatly gradually, and the flow of hydraulic oil is linear variation also; In addition, radial clearance between frustum and the last annular boss can also store the foul particle, when spool moves down, the foul particle is stored in the radial clearance between frustum and the last annular boss, can not damage the face that is sealed and matched of convex shoulder and last annular boss, guarantee the working life of spool and valve body, when spool moves, foul particle between frustum and the last annular boss in the gap is dashed to oil back chamber by hydraulic oil, and then flows into corresponding fuel tank.

Description of drawings

Fig. 1 is the structural representation of an embodiment of manual pilot valve among the present invention, also is the use phase diagram of an embodiment of spool among the present invention simultaneously;

Fig. 2 is the schematic representation that cooperates of spool and valve body among Fig. 1;

Fig. 3 is the cooperation schematic representation of spool among Fig. 1, push rod and spring mounting seat;

Fig. 4 is the plan view of Fig. 3 medi-spring fitting seat.

Embodiment

Manually the embodiment of pilot valve is shown in Fig. 1 ~ 4: be provided with oil back chamber 28 in comprising, the valve body 1 of control oil duct 31 and oil suction chamber 30, the upper end cap of valve body is equipped with valve gap 15, valve body is provided with axis and extends along the vertical direction, and connection oil back chamber, the spool mounting hole 33 of control oil duct and oil suction chamber, between oil back chamber and control oil duct, be provided with annular boss 50 on the hole wall of spool mounting hole, between control oil duct and oil suction chamber, be provided with down annular boss 51 on the hole wall of spool mounting hole, on, guiding is coated with spool 2 in the endoporus of following annular boss, the upper end of spool is provided with spool shaft shoulder 2-1, the outer race of spool is equipped with spring mounting seat 8, spring mounting seat comprises the fitting seat body, be top-loaded with Returnning spring 6 and driving spring 7 between fitting seat body and valve body and the spool respectively, pad is equipped with spring adjusting pad between driving spring and the spool, and Returnning spring and driving spring all adopt the low-carbon (LC) Spring Steel Wire.The fitting seat body is provided with the spool perforation 40 that runs through the fitting seat body along the vertical direction, the spool perforation is being Pear Shaped perpendicular to the sectional shape on the above-below direction, the big bore portion 40-1 of spool perforation passes from the bottom to top for the spool shaft shoulder, the diameter of big bore portion is greater than the external diameter of the spool shaft shoulder, the diameter of the aperture part 40-2 of spool perforation is less than the external diameter of the spool shaft shoulder, and the bore of large and small bore portion joint is not less than the spool external diameter that is connected with spool shaft shoulder lower end.In the upper end of fitting seat body push rod guide sleeve 13 is installed on the valve body, be coated with the push rod 14 that the lower end cooperates with fitting seat body pushing tow by Yx RunddichtringO 12 sealing guiding in the endoporus of push rod guide sleeve, the shaft shoulder pilot hole 14-1 that the lower end of push rod is provided with little bore portion and is coaxially set, also installs for the vertical guiding of the spool shaft shoulder.Valve body is provided with for promoting the Handleset that spool moves down by push rod.Handleset comprises the handle 11 that is articulated in the valve gap top by universal joint 3, handle is provided with the gland 4 for the pushing tow push rod, be covered with boot seal 22 on the gland, handle top is equipped with horn switch button, is provided with length bearing of trend thread hole consistent with the decreased food bearing of trend, that also install for the cable that is connected with horn switch button in the handle.The upper end of push rod cooperates with gland bottom pushing tow, the lower end of push rod guide sleeve is provided with the flange 32 that turns up, the upper end of push rod guide sleeve is plugged in guide sleeve first mounting hole on the valve gap, the flange that turns up of push rod guide sleeve seals in guide sleeve second mounting hole 25 that is inserted on the valve body by O RunddichtringO 10, be provided with installation step 26 between guide sleeve second mounting hole and the oil back chamber, installation step has spacing be directed upwardly, be used for the step surface that block cooperates bottom the flange that turns up, pad is equipped with two guide sleeves adjusting pads 19 between the following stomidium edge of the upper-end surface of the flange that turns up and guide sleeve first mounting hole.

Spool is provided with and is respectively applied to and upper and lower annular boss sealed sliding last convex shoulder 53 and following convex shoulder 54 movingly, and following convex shoulder is provided with the following throttling groove 34 of controlling oil duct and oil suction chamber for conducting, following throttling groove be shaped as U-shaped; Last convex shoulder lower ends downward convexes with the frustum 55 that upper end diameter is big, lower end diameter is little, the Outside diameter of frustum is slightly less than the diameter of convex shoulder, can better help to store the booty particle like this, frustum and last convex shoulder are coaxially set, offer the last throttling groove 56 for conducting control oil duct and oil back chamber on the outer circumferential face of frustum, last throttling groove be shaped as semicircle, the span of last throttling groove on above-below direction is greater than the axial length of tapered sleeve.Spool lower end outer circumferential face is provided with multi-turn along the balancing slit 36 of the axially spaced-apart setting of spool, spool top is provided with damping hole, damping hole has improved the operating characteristics of pilot valve, can reduce extraneous vibration to the influence of valve operation, make the more stable work of pilot valve, improved the service behaviour of reduction valve simultaneously, reduce the motion frequency of spool, the wearing and tearing of spool have been reduced, increased functional reliability, manually the concentric guiding valve differential area design of the two-stage up and down of pilot valve uniqueness can effectively reduce control area, so the product steering force is less, can finish all the time accurately, but repetitive operation.Simultaneously just because of the differential area structural design of the concentric guiding valve of two-stage just makes the guiding valve underpart to be connected with return opening, and the damping hole structure is set becomes possibility; Semicircular upward throttling groove has increased the flow conductivity of last throttling groove, and the upper end of last throttling groove extends on the convex shoulder, can make throttling groove prior to gap conducting control oil duct and oil back chamber between frustum and the last annular boss, makes the oil return process more steady.

In other embodiment of this manual pilot valve: the shape that goes up throttling groove can also be U-shaped or other shape; The span that last throttling groove is gone up along the vertical direction also can be equal to or less than the axial height of frustum; The Outside diameter of frustum also can equal the diameter of convex shoulder.

The embodiment of spool is shown in Fig. 1 ~ 4: the concrete structure of spool is identical with the spool described in above-mentioned each manual pilot valve embodiment, is not described in detail in this.

Claims (8)

1. the manual spool of pilot valve, comprise the spool body, the spool body is provided with for and is arranged on the last annular boss sealed sliding last convex shoulder movingly between corresponding oil back chamber and the control oil duct, it is characterized in that: the described lower ends downward that goes up convex shoulder convexes with the frustum that upper end diameter is big, lower end diameter is little, the Outside diameter of described frustum is not more than the described diameter of going up convex shoulder, described frustum and the described convex shoulder of going up are coaxially set, and offer the last throttling groove for the corresponding control oil duct of conducting and oil back chamber on the outer circumferential face of described frustum.
2. spool according to claim 1 is characterized in that: describedly go up the axial height that the span of throttling groove on above-below direction is not less than described frustum.
3. spool according to claim 1 is characterized in that: the Outside diameter of described frustum is less than the described diameter of going up convex shoulder.
4. according to any described spool of claim 1 ~ 3, it is characterized in that: the described semicircle that is shaped as that goes up throttling groove.
5. manual pilot valve, comprise and be provided with oil back chamber, the valve body of control oil duct and oil suction chamber, valve body is provided with axis and extends along the vertical direction, and be communicated with described oil back chamber, the spool mounting hole of control oil duct and oil suction chamber, between oil back chamber and control oil duct, be provided with annular boss on the hole wall of spool mounting hole, between control oil duct and oil suction chamber, be provided with down annular boss on the hole wall of spool mounting hole, on, guiding is coated with spool in the endoporus of following annular boss, spool comprises the spool body, the spool body be provided be respectively applied to described on, the corresponding sealed sliding of following annular boss movingly on, following convex shoulder, it is characterized in that: it is big that the described lower ends downward that goes up convex shoulder convexes with upper end diameter, the frustum that lower end diameter is little, the Outside diameter of described frustum is not more than the described diameter of going up convex shoulder, described frustum and the described convex shoulder of going up are coaxially set, and offer the last throttling groove for the corresponding control oil duct of conducting and oil back chamber on the outer circumferential face of described frustum.
6. manual pilot valve according to claim 5 is characterized in that: describedly go up the axial height that the span of throttling groove on above-below direction is not less than described frustum.
7. manual pilot valve according to claim 5 is characterized in that: the Outside diameter of described frustum is less than the described diameter of going up convex shoulder.
8. according to any described manual pilot valve of claim 5 ~ 7, it is characterized in that: the described semicircle that is shaped as that goes up throttling groove.
CN2013101959336A 2013-05-24 2013-05-24 Manual pilot valve and spool thereof CN103256269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013101959336A CN103256269A (en) 2013-05-24 2013-05-24 Manual pilot valve and spool thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013101959336A CN103256269A (en) 2013-05-24 2013-05-24 Manual pilot valve and spool thereof

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CN103256269A true CN103256269A (en) 2013-08-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110094379A (en) * 2019-03-20 2019-08-06 合肥壹点通信息科技有限公司 A kind of hydraulic directional valve

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012576A (en) * 1959-02-24 1961-12-12 Commercial Shearing Control valves with spool check and spool alignment devices
US4509406A (en) * 1980-06-16 1985-04-09 Caterpillar Tractor Co. Pressure reducing valve for dead engine lowering
GB2281115A (en) * 1993-08-17 1995-02-22 Kubota Kk Hydraulic pilot valve
CN1356481A (en) * 2001-12-27 2002-07-03 卢永松 Balancing valve
CN201575227U (en) * 2009-12-15 2010-09-08 青岛凯锐斯通液压机械有限公司 Hand-operated pilot valve
CN101893010A (en) * 2009-05-21 2010-11-24 上海立新液压有限公司 Hydraulic balanced valve
CN201991859U (en) * 2011-04-06 2011-09-28 邵燕平 Four-path pedal pilot valve
CN203272310U (en) * 2013-05-24 2013-11-06 平原机器厂(新乡) Manual operation pilot valve and valve element thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012576A (en) * 1959-02-24 1961-12-12 Commercial Shearing Control valves with spool check and spool alignment devices
US4509406A (en) * 1980-06-16 1985-04-09 Caterpillar Tractor Co. Pressure reducing valve for dead engine lowering
GB2281115A (en) * 1993-08-17 1995-02-22 Kubota Kk Hydraulic pilot valve
CN1356481A (en) * 2001-12-27 2002-07-03 卢永松 Balancing valve
CN101893010A (en) * 2009-05-21 2010-11-24 上海立新液压有限公司 Hydraulic balanced valve
CN201575227U (en) * 2009-12-15 2010-09-08 青岛凯锐斯通液压机械有限公司 Hand-operated pilot valve
CN201991859U (en) * 2011-04-06 2011-09-28 邵燕平 Four-path pedal pilot valve
CN203272310U (en) * 2013-05-24 2013-11-06 平原机器厂(新乡) Manual operation pilot valve and valve element thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110094379A (en) * 2019-03-20 2019-08-06 合肥壹点通信息科技有限公司 A kind of hydraulic directional valve

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Application publication date: 20130821

RJ01 Rejection of invention patent application after publication