CN102748336A - Speed change valve used for heavy machinery - Google Patents
Speed change valve used for heavy machinery Download PDFInfo
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- CN102748336A CN102748336A CN201210239416XA CN201210239416A CN102748336A CN 102748336 A CN102748336 A CN 102748336A CN 201210239416X A CN201210239416X A CN 201210239416XA CN 201210239416 A CN201210239416 A CN 201210239416A CN 102748336 A CN102748336 A CN 102748336A
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- end cap
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- spool
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Abstract
The invention relates to a speed change valve used for heavy machinery. A valve body is provided with a main channel inlet and a main channel outlet, one end of a valve element is provided with a spring, the outer end of an end cover is provided with a regulating bolt, a backstop is arranged at the top end of the regulating bolt of a right end cover, the backstop is inserted into a hole at the inner end of the end cover, the bottom of the hole at the inner end of the left end cover is provided with a groove, an oil cavity is formed between the groove and the end face of the valve element, the end cover is internally provided with an end cover bypass channel, one end of the end cover bypass channel is communicated with the groove, the end cover bypass channel is provided with a needle throttle valve and a small-diameter sliding valve controlled by an electromagnet, the valve body is provided with a valve body bypass channel, one end of the valve body bypass channel is communicated with the main channel inlet, and the other end of the valve body bypass channel is communicated with the other end of the end cover bypass channel. The speed change valve disclosed by the invention has the beneficial effects that variation of oil mass flowing out is smooth and has no sudden change, the slope of a speed change curve of a hydraulic cylinder is adjustable, the speed value of a working hydraulic cylinder before the end of run is adjustable, the price is low, and the speed change valve disclosed by the invention can be widely applied to a hydraulic system of heavy machinery equipment.
Description
Technical field
The invention belongs to the speed change valve technical field, relate in particular to heavy machinery and use speed change valve.
Background technique
In the heavy machinery hydraulic system, adopt in the selector valve control, long stroke hydraulic oil cylinder.With selector valve control, getting into the oil cylinder flow can't regulate, and oil cylinder running medium velocity is certain, and speed can raise suddenly or reduce its operating rate curve such as Fig. 1 when oil cylinder piston has just started or moved to terminal point.Curve by Fig. 1 can know, in its characteristic point 0, and A, B all has velocity jump among the C, bring very big impact load thus, and potential safety hazard is not only arranged, the working life that also can reduce equipment simultaneously.In order to reduce this impact load, and do not reduce manufacturing efficiency, be controlled to be example with terminal point, existing technological means is to change selector valve into proportional valve control.Often use percentage of import valve in the heavy machinery hydraulic systems such as bucket-wheel stacker reclaimer, steel rolling, continuous casting, its effect is according to the requirement of main frame machinery operating conditions, and the oil cylinder motion speed is controlled.In the time of before working stroke arrives the B point, electrical control stops its velocity curve such as Fig. 2 after in advance speed being reduced to a certain speed again.Curve by Fig. 2 can find out that the oil cylinder motion speed is stopped after the B point drops to the E-F line, it is than from obviously having reduced impact load by the direct parking of A-B line like this.But the sudden change at B point place still has bigger impact, and this impact is to mechanical life and hydraulic system still having considerable influence.In addition, modernized heavy duty equipment also often requires the parking spot of terminal point to want accurately, and stopping each time all requires mechanism to be parked in accurately near the C point, and its repeatability error heals better little.Realize the only resource of this requirement, be about to the area of the uncontrollable delta BMC among the figure one, through becoming the small size of the uncontrollable delta FNC among Fig. 2 after running slowly.More be bordering on 0 and work as the E-F speed line, EFC delta area is littler, and the error that parking spot C is ordered is littler.
The heavy machinery hydraulic system adopts Proportional valve, only can partly alleviate shock problem, and purchase cost is high, and the cycle is longer, influences the device fabrication cycle.And structure more complicated.
Summary of the invention
The objective of the invention is to develop a kind of heavy machinery rational in infrastructure, simple and practical, that reliability is high and use speed change valve,, shorten the device fabrication cycle to reduce the device fabrication cost.
Technological scheme of the present invention is: heavy machinery is used speed change valve; Comprise the end cap at valve body, valve body two ends and place the spool in the valve body that have main passage inlet and main passage outlet on the valve body, an end of spool is provided with spring; It is characterized in that said spool middle part is thick diameter platform; Matches with valve interior wall in thick diameter platform surface, the position of thick diameter platform is not blocked the main passage and gone into, exports when treating the working position, is positioned at the side that the main passage is gone into, exported; Said end cap comprises left end cap and right end cap, and the outer end of left end cap and right end cap is provided with the adjusting bolt, and the inner has the hole of matching with the spool end, and the spool two ends place left end cap and the inner hole of right end cap; The top of the adjusting bolt of said right end cap is provided with backstop, and backstop puts in the inner hole of end cap, and said spring places right end cap endoporus and spool end to connect; The bottom of stomidium has groove in the said left end cap; Form oil pocket between groove and the spool end, have the end cap by-pass in the left end cap, end cap by-pass one end communicates with groove; The end cap by-pass is provided with adjustable needle regulator; Also be provided with the minor diameter guiding valve by magnet control in the end cap by-pass, during the electromagnet energising, the minor diameter guiding valve is opened the end cap by-pass; During the electromagnet outage; Minor diameter guiding valve blocking-up end cap by-pass; Have the valve body by-pass on the valve body, valve body by-pass one end communicates with the main passage inlet, and the other end of valve body by-pass is divided into two interfaces; An interface is communicated with the end cap by-pass, and a side is not gone into, exports to another interface thick diameter platform of spool when treating the working position towards the main passage housing inner chamber is communicated with.
Heavy machinery according to the invention is used speed change valve, it is characterized in that center line that said main passage inlet and main passage export point-blank.
Working principle of the present invention is: when controlling the electromagnet outage of minor diameter guiding valve, and minor diameter guiding valve blocking-up end cap by-pass, pressure oil is exported through the main passage by main passage inlet entering and unimpededly flows to the parts-working solution cylinder pressure that needs fuel feeding.When the working solution cylinder pressure ran to nearly final position B (figure two), by the position limit switch of this position of reflection or near the electrical signal that switch sends electromagnet to be got electric, guiding valve moved; Conducting end cap by-pass; Pressure oil through the valve body by-pass, end cap by-pass and needle regulator gently charge into the oil pocket of spool one end, promotes spool and move to the other end, the logical pasta that covers main passage inlet and main passage outlet gradually amasss; The flow that gets into the working solution cylinder pressure is reduced gradually; Realized that promptly working hydraulic pressure cylinder working speed reduces slowly, reposefully, through regulating the adjusting bolt that connects adjustable needle regulator, can regulate charges into the oil speed of oil pocket.When backstop was run in the other end of spool, spool stopped to move.The long-pending no longer variation of main passage inlet and the logical pasta of main passage outlet, the flow that flows out the oil of main passage outlet no longer changes, and working solution cylinder pressure speed can be stabilized in a certain than low value.Promptly realized the preceding reduction of speed of terminal point.Velocity amplitude can be regulated by the position of backstop before the terminal point; The top of regulating the valve gap outer end is provided with the adjusting bolt of backstop; Can make backstop be in different positions; To cover the main passage inlet long-pending with the logical pasta of main passage outlet thereby change spool, and to be spool with main passage inlet and main passage export the minimum position of backstop all covers, and working solution cylinder pressure speed is bordering on 0.Because it is constant that the effect of adjustable needle regulator makes the flow that gets into oil pocket; So the travelling speed of spool is constant; The oil mass that main passage outlet is flowed out is slow continually varying, thereby the B point reduction of speed afterwards that makes the velocity curve of working hydraulic pressure cylinder working be accompanying drawing 5 is curvilinear motion, and B point and back segment velocity curve each point are point of contact or slick and sly point; Do not have the discontinuity of speed, and make whole service steadily not have impact.
When oil cylinder is reverse, the electromagnet outage, the main passage entrance and exit loses pressure because of hydraulic fluid port connects fuel tank, and spool returns under the promotion of spring and treats the working position.
The invention has the beneficial effects as follows:
(1) oil mass of main passage outlet outflow changes the slick and sly sudden change of not having, and makes the not sudden change of oil of entering working solution cylinder pressure, impacts little.
(2) make the slope of working solution cylinder pressure speed change curves can pass through pin type throttle valve adjustment, easy to adjust reliable.
(3) make the preceding velocity amplitude of the working solution cylinder pressure end of run adjustable, through regulating the position regulation of backstop.
(4) can replace the Proportional valve system to realize working solution cylinder pressure terminal point front reduction gear function, and low price.
(5) can be widely used in the hydraulic system of heavy duty equipment.
Description of drawings
The present invention has five width of cloth accompanying drawings.Wherein:
Fig. 1 is the speed curve diagram of traditional selector valve control hydraulic cylinder works
Fig. 2 is the speed curve diagram of traditional proportional valve control hydraulic cylinder works
Fig. 3 is a speed change valve sectional view of the present invention
Fig. 4 is the left view of Fig. 3
Fig. 5 is the speed curve diagram with speed change valve control hydraulic cylinder works of the present invention
In the accompanying drawing, 1. main passage inlet, 2. main passage outlet, 3. end cap by-pass, 4. adjustable needle regulator, 5. oil pocket; 6. spool, 7. backstop, 8. minor diameter guiding valve, 9. electromagnet, 10, the valve body by-pass, 11, right end cap; 12, valve body, 13, screw, 14, seal ring, 15, seal ring, 16, seal ring; 17, spring, 18, dust ring, 19, left end cap, 20, seal ring, 21, the smash plug that rises.
Embodiment
Embodiment below in conjunction with accompanying drawing is described further the present invention.
Speed change valve comprises the end cap at valve body, valve body two ends and places the spool 6 in the valve body; Have main passage inlet 1 and main passage outlet 2 on the valve body; One end of spool 6 is provided with spring; Spool 6 middle parts are thick diameter platform, match with valve interior wall in thick diameter platform surface, and thick diameter platform is positioned at the side that the main passage is gone into, exported when treating the working position; The outer end of end cap is provided with the adjusting bolt, and the inner has the hole of matching with the spool end, and spool 6 two ends place the inner hole of end cap; Top at the adjusting bolt of right end cap 11 is provided with backstop 7, and backstop 7 puts in the inner hole of right end cap 11, and spring places in the inner hole of right end cap and spool end connects; The bottom of stomidium has groove in the left end cap 19; Form oil pocket 5 between groove and the spool end, have end cap by-pass 3 in the left end cap 19, end cap by-pass 3 one ends communicate with groove; End cap by-pass 3 is provided with adjustable needle regulator 4; Also be provided with minor diameter guiding valve 8 in the end cap by-pass 3 by electromagnet 9 controls, during electromagnet 9 outages, minor diameter guiding valve 8 blocking-up end cap by-passes 3; Electromagnet 9 when electric, minor diameter guiding valve 8 is opened end cap by-pass 3; Have valve body by-pass 10 on the valve body; Valve body by-pass 10 1 ends communicate with main passage inlet 1; The other end of valve body by-pass 10 is divided into two interfaces; An interface is communicated with end cap by- pass 3, and 1,2 one sides are not gone into, export to another interface thick diameter platform of spool when treating the working position towards the main passage housing inner chamber is communicated with.The center line of main passage inlet 1 and main passage outlet 2 point-blank.
During concrete the application, heavy machinery is connected between working solution cylinder pressure and the solenoid directional control valve with speed change valve.During proper functioning, electromagnet 9 outage, the solenoid directional control valve energising, minor diameter guiding valve 8 blocking-up end cap by-passes 3, pressure oil unimpededly flows to the working solution cylinder pressure by electromagnetic switch valve outlet port flow through speed change valve main passage inlet 1 and main passage outlet 2.When the working solution cylinder pressure runs to nearly final position B (figure two); By the position limit switch of this position of reflection or near the electrical signal that switch sends electromagnet 9 is got; Minor diameter guiding valve 8 is moved, conducting end cap by-pass 3, pressure oil through valve body by-pass 10, end cap by-pass 3 and adjustable needle regulator 4 gently charge into the oil pocket 5 in spool 6 left sides; Promoting spool 6 slowly moves right; It is long-pending with the logical pasta of main passage outlet 2 to cover main passage inlet 1 gradually, and the flow that gets into the working solution cylinder pressure is reduced gradually, has realized that promptly working hydraulic pressure cylinder working speed slowly, reduce reposefully.When backstop 7 was run in the right side of spool 6, spool stopped to move.Main passage inlet 1 amasss no longer with main passage outlet 2 logical pastas and changes, and working solution cylinder pressure speed can be stabilized in a certain than low value.Promptly realized the preceding reduction of speed of terminal point.Velocity amplitude can be regulated by the position of backstop 7 before this design terminal point, and working solution cylinder pressure speed minimum value can be transferred to and be bordering on 0, and promptly spool 6 covers the main passage fully and exports at 2 o'clock.Because the flow through adjustable needle regulator 4 is constant; So the travelling speed of spool 6 is constant, the oil mass that main passage outlet 2 is flowed out is slow continually varying, thereby the B point reduction of speed afterwards that makes the velocity curve of working hydraulic pressure cylinder working be accompanying drawing 5 is curvilinear motion; B point and back segment velocity curve each point are point of contact or slick and sly point; So, do not have the discontinuity of speed, and make whole service steadily not have impact.
When the working solution cylinder pressure was reverse, main passage inlet 1 exported 2 because of the hydraulic fluid port connected tank loses pressure with the main passage, and spool 6 is moved to the left under the promotion of spring 7, recovers speed change valve to treating the working position.
This heavy machinery can substitute the percentage of import valve in bucket-wheel stacker reclaimer, steel rolling, the caster hydraulic system with speed change valve; Be used for hydraulic system working solution cylinder pressure start, end ascending, descending speed operation and accurate stopping; Its transient process is steadily adjustable; Motion speed is adjustable before the terminal point, and manufacture cost reduces greatly.
Claims (2)
1. heavy machinery is used speed change valve; Comprise the end cap at valve body (12), valve body two ends and place the spool (6) in the valve body that have main passage inlet (1) and main passage outlet (2) on the valve body (12), an end of spool (6) is provided with spring (17); It is characterized in that said spool (6) middle part is thick diameter platform; Matches with valve interior wall in thick diameter platform surface, the position of thick diameter platform is not blocked the main passage and gone into, exports (1,2) when treating the working position, is positioned at the side that (1,2) are gone into, exported in the main passage; Said end cap comprises left end cap (11) and right end cap (19), and the outer end of left end cap (11) and right end cap (19) is provided with the adjusting bolt, and the inner has the hole of matching with the spool end, and spool (6) two ends place left end cap (11) and the inner hole of right end cap (19); The top of the adjusting bolt of said right end cap (11) is provided with backstop (7), and backstop (7) puts in the inner hole of end cap, and said spring (17) places right end cap (11) endoporus and spool (6) end face to connect; The bottom of the interior stomidium of said left end cap (19) has groove; Form oil pocket (5) between groove and the spool end, have end cap by-pass (3) in the left end cap (19), end cap by-pass (3) one ends communicate with groove; End cap by-pass (3) is provided with adjustable needle regulator (4); Also be provided with the minor diameter guiding valve (8) by electromagnet (9) control in the end cap by-pass (3), during electromagnet (9) energising, minor diameter guiding valve (8) is opened end cap by-pass (3); During electromagnet (9) outage; Minor diameter guiding valve (8) blocking-up end cap by-pass (3); Have valve body by-pass (10) on the valve body (12), valve body by-pass (10) one ends communicate with main passage inlet (1), and the other end of valve body by-pass (10) is divided into two interfaces; An interface is communicated with end cap by-pass (3), and (1,2) side is not gone into, exports to another interface thick diameter platform of spool when treating the working position towards the main passage housing inner chamber is communicated with.
2. use speed change valve according to the said heavy machinery of claim 1, it is characterized in that center line that said main passage inlet (1) and main passage export (2) point-blank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210239416.XA CN102748336B (en) | 2012-07-11 | 2012-07-11 | Speed change valve used for heavy machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210239416.XA CN102748336B (en) | 2012-07-11 | 2012-07-11 | Speed change valve used for heavy machinery |
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| Publication Number | Publication Date |
|---|---|
| CN102748336A true CN102748336A (en) | 2012-10-24 |
| CN102748336B CN102748336B (en) | 2014-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210239416.XA Active CN102748336B (en) | 2012-07-11 | 2012-07-11 | Speed change valve used for heavy machinery |
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| Country | Link |
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| CN (1) | CN102748336B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1309163A (en) * | 1969-06-28 | 1973-03-07 | Bosch Gmbh Robert | Fluid flow-regulating valves |
| JPS5540373A (en) * | 1979-01-22 | 1980-03-21 | Jidosha Kiki Co Ltd | Flow rate control valve |
| DE4002755A1 (en) * | 1990-01-31 | 1991-08-01 | Daimler Benz Ag | Automatic distributor valve controlling oil supply - has spool valve actuated by inlet pressure to apportion pump output between first and second user |
| CN2625629Y (en) * | 2003-05-30 | 2004-07-14 | 华中科技大学 | Seawater hydraulic pressure flow control valve |
| CN202673813U (en) * | 2012-07-11 | 2013-01-16 | 大连华锐重工集团股份有限公司 | Speed change valve for heavy machinery |
-
2012
- 2012-07-11 CN CN201210239416.XA patent/CN102748336B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1309163A (en) * | 1969-06-28 | 1973-03-07 | Bosch Gmbh Robert | Fluid flow-regulating valves |
| JPS5540373A (en) * | 1979-01-22 | 1980-03-21 | Jidosha Kiki Co Ltd | Flow rate control valve |
| DE4002755A1 (en) * | 1990-01-31 | 1991-08-01 | Daimler Benz Ag | Automatic distributor valve controlling oil supply - has spool valve actuated by inlet pressure to apportion pump output between first and second user |
| CN2625629Y (en) * | 2003-05-30 | 2004-07-14 | 华中科技大学 | Seawater hydraulic pressure flow control valve |
| CN202673813U (en) * | 2012-07-11 | 2013-01-16 | 大连华锐重工集团股份有限公司 | Speed change valve for heavy machinery |
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| Publication number | Publication date |
|---|---|
| CN102748336B (en) | 2014-10-15 |
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