CN110966275B - Damping buffer method of large-flow throttling buffer cartridge valve and cartridge valve - Google Patents
Damping buffer method of large-flow throttling buffer cartridge valve and cartridge valve Download PDFInfo
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- CN110966275B CN110966275B CN201911394607.1A CN201911394607A CN110966275B CN 110966275 B CN110966275 B CN 110966275B CN 201911394607 A CN201911394607 A CN 201911394607A CN 110966275 B CN110966275 B CN 110966275B
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- 239000000872 buffer Substances 0.000 title claims abstract description 219
- 238000013016 damping Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 143
- 238000003780 insertion Methods 0.000 claims description 17
- 230000037431 insertion Effects 0.000 claims description 17
- 238000013459 approach Methods 0.000 claims description 11
- 230000003139 buffering effect Effects 0.000 abstract description 26
- 238000012545 processing Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
- 230000006872 improvement Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
- E02D7/10—Power-driven drivers with pressure-actuated hammer, i.e. the pressure fluid acting directly on the hammer structure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Chemical & Material Sciences (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a damping buffer method of a large-flow throttling buffer cartridge valve, which adopts the buffer and vibration reduction design of an oil way, so that the oil way is gradually narrowed and transited, a throttling buffer containing cavity is formed at the upward or downward movement tail end of a valve core through inserting a throttling buffer groove, a throttling orifice is gradually reduced, the flow damping buffer is gradually reduced, the damping buffer performance is improved, and the energy supply efficiency of the cartridge valve is higher. The invention also discloses a cartridge valve, which changes the valve core into a straight cylinder integrated type, is convenient for processing and assembling the valve core, saves processing and assembling cost, integrally forms the guide shaft and the valve cover, ensures that the valve enters an oil duct of the guide shaft without sealing treatment, avoids the occurrence of form and position tolerance of the guide shaft, improves the use effect and performance, and improves the stability of flow. The invention realizes damping buffering through synchronous improvement of the structure and the process, so that the damping buffering device improves the function output and the stability, prevents impact vibration at the end of movement, prolongs the service life and is suitable for heavy hydraulic piling equipment.
Description
Technical Field
The invention relates to the technical field of hydraulic piling equipment, in particular to a damping buffer method of a large-flow throttling buffer cartridge valve of heavy hydraulic equipment and the cartridge valve.
Background
The common drivers in construction engineering are two types, namely a hydraulic walking type diesel hammer driver and a high-frequency hydraulic vibration driver. Along with the improvement of society and the continuous improvement of the scientific and technical level, the technical level of the building field is also driven to be improved, the large-scale hydraulic pile drivers in China are still in the development stage at present, the technology is still not mature, most of the large-scale hydraulic pile drivers are imported from abroad, the imported equipment cannot meet the requirement of the large-scale hydraulic pile drivers in the building field of China at present, the development of the building field of China is not facilitated, and therefore the technology of the large-scale hydraulic pile drivers in China is urgently required to be improved, and the disadvantageous problem is solved.
At present, in the construction process of building pile foundations, pile driving hammers are often required to be used for pile foundation pile sinking construction, and the common pile driving hammers comprise hydraulic hammers, hydraulic vibration hammers, diesel hammers and the like. In particular to heavy engineering equipment and large ocean engineering equipment, which have higher requirements on the stability and safety of cartridge valve operation due to severe construction environment, long continuous operation time and the like, but the prior art is difficult to meet.
With the development of economy and society, large-scale construction projects such as cross-sea bridges, offshore wind power, land super-large bridges and super-high-rise buildings are more and more, and the requirements of heavy construction equipment required by the large-scale construction are more and more outstanding. However, because the heavy construction equipment in China is started later, a great deal of core technology is monopolized by foreign enterprises, and the large-flow dynamic output control method and the buffer design of the cartridge valve of the heavy pile foundation construction equipment are involved, the technology can ensure that the heavy construction equipment under the field and severe operation conditions can maintain safe, stable, long-term and continuous construction, greatly reduce equipment failure rate generated during long-term and continuous construction, and ensure engineering quality and progress.
At present, the key technology for designing and manufacturing a large-scale hydraulic vibrating pile driver mainly depends on three main parts of a cartridge valve, a hammer core and a hammer body, and the cartridge valve is more important as a power source and a control execution part of the cartridge valve; the prior domestic cartridge valve has a plurality of defects, and therefore, continuous improvement and perfection are required.
The inventor applies for a Chinese invention before the inventor, the application number is CN20181023973. X, it discloses a cartridge valve high-flow dynamic output control method and cartridge valve, the cartridge valve includes valve pocket, valve pocket end cover, guide shaft fixing seat, fixed flange, guide shaft and valve core, the outer side of the valve core is curved, and form a plurality of steps, the valve core of curved is difficult to process and assemble, influence the processing and assembly cost; the guide shaft is arranged on the valve sleeve end cover by utilizing the guide shaft fixing seat and the fixing flange, a plurality of parts are used for assembling the guide shaft, form and position tolerance is easy to appear in the assembly and use process, the precision is influenced, the use effect and the performance are influenced, an oil duct entering the guide shaft is required to pass through the guide shaft fixing seat, multiple sealing treatment is required, and the structure is complex; and a spring buffer piece is arranged between the valve core and the guide shaft fixing seat, and is used for reducing the impact force when the valve core is reversed, and the spring is used as the buffer piece, so that the service life and the buffer performance are limited, the equipment failure rate is difficult to control, and the spring buffer piece is not suitable for heavy hydraulic piling equipment.
Therefore, improvement is needed on the basis of the prior art, so that the valve core is more convenient to process and assemble, the form and position tolerance of a guide shaft is avoided, the flow stability is improved, and the energy supply efficiency of the cartridge valve is higher; the buffer mode is improved, the service life and the buffer performance are prolonged, the failure rate of equipment is reduced, and meanwhile, the buffer mode is suitable for heavy hydraulic piling equipment.
Disclosure of Invention
Aiming at the defects, the invention provides a damping buffer method of a high-flow throttling buffer cartridge valve and the cartridge valve, and the damping buffer method and the cartridge valve improve the output and the stability of functions through synchronous improvement of structures and processes so as to be suitable for heavy hydraulic piling equipment; the damping buffering method adopts the buffering and vibration reduction design of the oil way, so that the oil way is gradually narrowed and transited, damping buffering is realized, impact vibration at the end of movement is prevented, the service life is prolonged, and the buffering performance is improved; this large-traffic throttle buffering cartridge valve changes the case into straight section of thick bamboo integral type, make things convenient for the processing and the assembly of case, practice thrift processing and assembly cost, with guiding axle and valve gap integrated into one piece, make the oil duct that gets into the guiding axle, need not sealed processing, the structure is succinct, reduce the part quantity of guiding axle installation in addition, improve the precision, avoid the guiding axle to appear form the position tolerance, improve result of use and performance, the stability of flow has been improved, upward or decurrent motion tip at the case forms throttle buffering appearance chamber through inserting with throttle buffering recess, make the throttle reduce gradually and reduce flow damping buffering gradually, improve damping buffer performance, make the energy supply efficiency of cartridge valve higher.
The technical scheme is as follows:
A damping buffer method of a large-flow throttling buffer cartridge valve comprises the following steps:
(1) The pressure oil enters a first sealed containing cavity through a first oil duct of a valve cover, the pressure oil in the first sealed containing cavity applies pressure to the upper end face protruding in the valve core to enable the valve core to move downwards, meanwhile, the oil in a second sealed containing cavity gradually flows out of a second oil duct and moves downwards along with the valve core, a second throttling buffer groove on the lower end face of an outer cylinder body of the valve core is gradually close to the upper end of a limiting ring to form a second throttling buffer containing cavity, the end head of the upper end of the limiting ring is gradually inserted into the second throttling buffer groove, the second throttling orifice is gradually reduced, the pressure oil in the second throttling buffer groove gradually flows out of the second throttling orifice until the second throttling orifice is closed, meanwhile, an outer cylinder body of the valve core seals a second oil port, and a third oil port is communicated with a plurality of first oil ports through the valve core oil duct; the high-flow throttling buffer cartridge valve comprises a valve cover, a valve sleeve, a valve core and a limiting ring, wherein the valve core comprises an inner cylinder body and an outer cylinder body, a valve core inner protrusion is arranged on the inner side wall of the inner cylinder body, a first sealing containing cavity and a second sealing containing cavity are respectively arranged on the upper end face and the lower end face of the valve core inner protrusion, a first oil duct and a second oil duct are arranged in the valve cover, a second throttling buffer groove is formed in the lower end of the outer cylinder body, and a second throttling port is formed between the upper end head of the limiting ring and a notch of the second throttling buffer groove;
(2) The pressure oil enters the second sealed containing cavity through the second oil duct of the valve cover, the pressure oil in the second sealed containing cavity applies pressure to the lower end face of the inner protrusion of the valve core to enable the valve core to move upwards, meanwhile, the oil in the first sealed containing cavity gradually flows out of the first oil duct and moves upwards along with the valve core, the upper end of the outer cylinder body gradually approaches the first throttling buffer groove to form a first throttling buffer containing cavity, the end head at the upper end of the outer cylinder body gradually penetrates into the first throttling buffer groove, the first throttling is gradually reduced, the pressure oil in the first throttling buffer groove gradually flows out of the first throttling orifice until the first throttling orifice is closed, and meanwhile, the outer cylinder body of the valve core seals the first oil port, and the third oil port is communicated with a plurality of second oil ports; the valve cover comprises a cover plate, an annular lower bulge is arranged on the lower end face of the cover plate, a first throttling buffer groove is formed in the lower end of the circumferential outer side face of the annular lower bulge, and a first throttling orifice is formed between the upper end head of the outer cylinder body and the notch of the first throttling buffer groove;
(3) And (5) circularly repeating the steps (1) and (2).
The inner side surface of the upper end head of the outer cylinder body is provided with a first inserting inclined surface, the inner side surface of the upper end head of the limiting ring is provided with a second inserting inclined surface, and the first inserting inclined surface and the second inserting inclined surface respectively form a first throttling port and a second throttling port with the notch of the first throttling buffer groove and the notch of the second throttling buffer groove, and the damping buffer method further comprises the following steps:
When the valve core moves downwards, the second insertion inclined surface of the upper end head of the limiting ring is gradually inserted into the second throttling buffer groove at the lower end of the outer cylinder body, the second throttling orifice is gradually reduced, pressure oil flowing out of the second throttling buffer containing cavity is gradually reduced, and damping force of the pressure oil in the second throttling buffer containing cavity on the downward movement of the valve core is gradually increased;
When the valve core moves upwards, the first insertion inclined surface of the upper end head of the outer cylinder body is gradually inserted into the first throttling buffer groove at the lower end of the annular lower bulge, the first throttling orifice is gradually reduced, pressure oil flowing out of the first throttling buffer containing cavity is gradually reduced, and the damping force of the pressure oil in the first throttling buffer containing cavity on the upward movement of the valve core is gradually increased.
The valve cover comprises a cover plate and a guide shaft, the middle part of the lower end of the cover plate is integrally connected with the guide shaft, an annular lower bulge is arranged on the lower end face of the cover plate, a first throttling buffer groove is arranged at the lower end of the circumferential outer side face of the annular lower bulge, a first annular groove is circumferentially arranged at the middle part of the guide shaft, the valve core comprises an inner cylinder body and an outer cylinder body, a valve core oil duct is formed between the inner cylinder body and the outer cylinder body, a second throttling buffer groove is arranged at the lower end face of the outer cylinder body, a first inner sliding cavity is formed in the inner hollow of the inner cylinder body, a valve core inner bulge is arranged on the inner side wall of the first inner sliding cavity, the guide shaft penetrates through the first inner sliding cavity of the valve core and is in vertical sealing sliding connection with the inner cylinder body, a first sealing cavity is formed between the upper end face of the inner bulge and the lower end face of the first annular groove, a second inner sliding cavity is formed between the upper end face of the inner bulge and the inner cylinder body, a second inner sliding cavity is formed between the inner bulge and the inner cylinder body, a second sealing cavity is formed between the inner sliding cavity of the inner cylinder body and the inner cylinder body, a second sealing cavity is formed between the inner sealing cavity of the inner cylinder body and the inner sealing cavity, and the inner sealing cavity is formed between the inner sealing cavity of the inner cavity and the inner sealing cavity, and the inner sealing cavity of the inner sealing cavity is formed between the sealing cavity of the inner sealing cavity and the sealing cavity, the outer side circumference of the valve sleeve is sequentially provided with a plurality of first oil ports and a plurality of second oil ports from top to bottom, the limiting ring is provided with a third oil port, the first oil ports are communicated with the third oil ports along the valve core oil duct through downward movement of the valve core, and the upper end head of the limiting ring is gradually inserted into the second throttling buffer groove for damping throttling buffer; the second oil port is communicated with the third oil port through upward movement of the valve core, and the upper end head of the outer cylinder body is gradually inserted into the first throttling buffer groove for damping throttling buffer.
The inner side surfaces of the upper end heads of the outer cylinder body and the limiting ring are respectively provided with a first inserting inclined surface and a second inserting inclined surface, the upper end of the outer cylinder body gradually approaches to the first throttling buffer groove through upward movement of the valve core to form a first throttling buffer containing cavity, the first inserting inclined surface of the upper end head of the outer cylinder body gradually inserts into the first throttling buffer groove through upward movement of the valve core, and a first throttling orifice of the first throttling buffer containing cavity is formed between the first inserting inclined surface and a notch of the first throttling buffer groove; the second throttling buffer groove on the lower end surface of the outer cylinder body gradually approaches to the upper end of the limiting ring through the downward movement of the valve core to form a second throttling buffer containing cavity, the second inserting inclined surface of the upper end head of the limiting ring gradually inserts into the second throttling buffer groove through the downward movement of the valve core, and a second throttling orifice of the second throttling buffer containing cavity is formed between the second inserting inclined surface and the notch of the second throttling buffer groove.
The guide shaft comprises a first guide shaft, a second guide shaft and a sealing ring, wherein the second guide shaft is connected with the middle part of the lower end of the cover plate through the first guide shaft in an integrated manner, the second guide shaft is smaller than the first guide shaft, the sealing ring is arranged at the lower end of the second guide shaft, and the upper end face of the sealing ring, the outer side face of the second guide shaft and the lower end face of the first guide shaft form a first annular groove.
The guide shaft further comprises a nut, the lower end of the second guide shaft is provided with external threads, the external threads of the second guide shaft are matched with the nut, the lower end of the second guide shaft sequentially penetrates through the sealing ring to be in threaded connection with the nut, and the upper end face of the nut abuts against the lower end face of the sealing ring.
The guide shaft further comprises a first screw, a first through hole is formed in the outer side wall of the nut, a screw hole is formed in the lower end of the second guide shaft through external threads, and the first screw penetrates through the first through hole and is in threaded connection with the screw hole in a matched mode.
The first inner sliding cavity comprises a first section inner sliding cavity and a second section inner sliding cavity from top to bottom in sequence, the inner protrusion of the valve core is positioned between the first section inner sliding cavity and the second section inner sliding cavity, and the first section inner sliding cavity, the inner protrusion of the valve core and the second section inner sliding cavity are respectively connected with the first guide shaft, the second guide shaft and the sealing ring in a vertical sealing sliding fit manner.
The guide shaft further comprises a first sealing ring, a first groove is formed in the periphery of the outer side face of the first guide shaft, the first sealing ring is installed on the first groove, and the first guide shaft is connected with the inner sliding cavity of the first section in a sealing sliding fit mode through the first sealing ring.
The guide shaft further comprises a second sealing ring, a second groove is formed in the periphery of the outer side face of the sealing ring, the second sealing ring is installed on the second groove, and the sealing ring is connected with the second section inner sliding cavity in a sealing sliding fit mode through the second sealing ring.
The valve core further comprises a third sealing ring, a third groove is circumferentially formed in the inner side face of the inner protrusion of the valve core, the third sealing ring is installed on the third groove, and the inner protrusion of the valve core is in sealing sliding fit connection with the outer side face of the second guide shaft through the third sealing ring.
The novel valve sleeve is characterized by further comprising a fourth sealing ring, a fourth groove is formed in the circumference of the inner side wall of the valve sleeve, the fourth groove is located between the first oil port and the second oil port, the fourth sealing ring is installed on the fourth groove, and a second inner sliding cavity of the valve sleeve is in sealing sliding fit connection with the outer side face of the outer cylinder body through the fourth sealing ring.
The valve sleeve is characterized by further comprising a fifth sealing ring, wherein an annular lower bulge is arranged on the lower end face of the cover plate, a fifth groove is formed in the circumferential outer side face of the annular lower bulge, the fifth sealing ring is arranged on the fifth groove, the cover plate is inserted into the upper end of the second inner sliding cavity of the valve sleeve through the annular lower bulge, and the annular lower bulge is in sealing connection with the upper end of the valve sleeve through the fifth sealing ring.
The inner side surface of the annular lower bulge and the guide shaft form an annular avoidance port, the upper end of the inner cylinder body is higher than the upper end of the outer cylinder body, and the inner cylinder body movably extends into the annular avoidance port.
It should be noted that:
The foregoing "first and second …" do not represent a specific number or order, but merely serve to distinguish between names.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the term "inner" is directed toward the central vertical axis of the guide shaft, and the orientation or positional relationship indicated by the term "outer" is opposite to the direction indicated by the term "inner".
The advantages and principles of the invention are described below:
1. According to the damping buffer method of the large-flow throttling buffer cartridge valve and the cartridge valve, provided by the invention, the structure and the process are synchronously improved, so that the functional output and the stability are improved, and the damping buffer method is suitable for heavy hydraulic piling equipment.
2. According to the damping buffer method of the large-flow throttling buffer cartridge valve, when the valve core moves upwards or downwards, the throttling buffer cavity is formed at the movement end of the valve core, the throttling mouth of the throttling buffer cavity is gradually reduced by the movement of the valve core end, so that the flow rate of pressure oil flowing out of the throttling buffer cavity is gradually reduced, the damping buffer is realized by gradually narrowing and transiting an oil way by adopting the buffer and damping design of the oil way, and the bidirectional pressure control is adopted, the cartridge valve can be controlled by only needing less pressure oil, the reversing action is irrelevant to the dynamic characteristic of flowing oil, and the flow control difference in a differential system is met; the stability of the flow is improved to meet the power and control requirements of the large pile driver.
3. The inner side surfaces of the upper end heads of the outer cylinder body and the limiting ring are respectively provided with the first inserting inclined surface and the second inserting inclined surface, and the throttling buffer cavity is formed at the upward or downward movement end of the valve core through the inserting inclined surface and the throttling buffer groove, so that the throttling port is gradually reduced, the flow is gradually reduced, damping buffer is realized, and the damping buffer performance is improved.
4. The invention provides a high-flow throttling buffer cartridge valve, which comprises a valve cover, a valve sleeve, a valve core and a limiting ring, wherein when the high-flow throttling buffer cartridge valve is used, pressure oil firstly enters a first sealing containing cavity through a first oil duct, the pressure oil in the first sealing containing cavity applies pressure to the upper end face of a protrusion in the valve core to enable the valve core to move downwards, meanwhile, oil in a second sealing containing cavity gradually flows out of a second oil duct and moves downwards along with the valve core, a second throttling buffer containing cavity is formed by gradually approaching a second throttling buffer groove on the lower end face of an outer cylinder body of the valve core to the upper end of the limiting ring, the pressure oil in the second throttling buffer containing cavity dampens the downward movement of the valve core, the end head of the upper end of the limiting ring is gradually inserted into the second throttling buffer groove until the valve core is closed, and meanwhile, the outer cylinder body of the valve core seals a second oil port and a third oil port is communicated with a plurality of first oil ports through the valve core; then switching, the pressure oil enters a second sealed containing cavity through a second oil duct, the pressure oil in the second sealed containing cavity applies pressure to the lower end face of the inner protrusion of the valve core to enable the valve core to move upwards, meanwhile, the oil in the first sealed containing cavity gradually flows out of the first oil duct and moves upwards along with the valve core, the upper end of the outer cylinder body and the first throttling buffer groove are gradually close to form a first throttling buffer containing cavity, the pressure oil in the first throttling buffer containing cavity dampens and buffers the upward movement of the valve core, the end head of the upper end of the outer cylinder body gradually penetrates into the first throttling buffer groove until the valve core is closed, and meanwhile, the outer cylinder body of the valve core closes the first oil port, and the third oil port is communicated with a plurality of second oil ports; the oil supply and the oil return of the first oil duct and the second oil duct are circularly repeated, so that the hydraulic pile hammer repeatedly lifts and drops the hammer, and the energy supply and the control of the large hydraulic pile driver are realized; this large-traffic throttle buffering cartridge valve changes the case into straight section of thick bamboo integral type, make things convenient for the processing and the assembly of case, practice thrift processing and assembly cost, with guiding axle and valve gap integrated into one piece, make the oil duct that gets into the guiding axle, do not need sealed processing, the structure is succinct, reduce the part quantity of guiding axle installation in addition, improve the precision, avoid the guiding axle to appear form the position tolerance, improve result of use and performance, the stability of flow has been improved, upward or decurrent motion tip at the case forms throttle buffering appearance chamber through inserting with the throttle buffering recess, utilize the motion damping buffering of the pressure oil in the throttle buffering appearance intracavity to the case, improve damping buffer performance, make the energy supply efficiency of cartridge valve higher.
5. The inner side surfaces of the upper end heads of the outer cylinder body and the limiting ring are respectively provided with the first inserting inclined surface and the second inserting inclined surface, the first inserting inclined surface and the second inserting inclined surface are respectively inserted into the first throttling buffer groove and the second throttling buffer groove in a moving mode, a first throttling opening and a second throttling opening which are gradually reduced in moving insertion are formed, the throttling opening is gradually reduced, pressure oil flowing out of the throttling opening is gradually reduced, and therefore the movement resistance of the pressure oil in the throttling buffer containing cavity to the valve core is gradually increased, damping buffer is achieved, and damping buffer performance is improved.
6. The guide shaft comprises a first guide shaft, a second guide shaft and a sealing ring, wherein a first annular groove is formed in the upper end face of the sealing ring, the outer side face of the second guide shaft and the lower end face of the first guide shaft, and the second guide shaft is smaller than the first guide shaft and is integrally formed with the first guide shaft.
7. The guide shaft also comprises a nut, and the upper end of the nut is abutted against the lower end face of the sealing ring, so that the sealing ring is convenient to fix and install.
8. The guide shaft further comprises a first screw, and the lower ends of the nut and the second guide shaft are further anchored through the first screw, so that the nut is prevented from loosening.
9. The first inner sliding cavity comprises a first section inner sliding cavity and a second section inner sliding cavity from top to bottom in sequence, and the first section inner sliding cavity, the valve core inner protrusion and the second section inner sliding cavity are respectively connected with the first guide shaft, the second guide shaft and the sealing ring in a vertical sealing sliding fit manner, so that the sealing sliding fit between the valve core inner cylinder body and the guide shaft is more stable.
10. The first guide shaft is connected with the first section inner sliding cavity in a sealing sliding fit manner through the first sealing ring, so that the sealing performance between the first guide shaft and the first section inner sliding cavity is improved.
11. The sealing ring is connected with the second segment inner sliding cavity in a sealing sliding fit manner through the second sealing ring, so that the sealing performance between the sealing ring and the second segment inner sliding cavity is improved.
12. The valve core inner protrusion is connected with the outer side face of the second guide shaft in a sealing sliding fit manner through the third sealing ring, so that the sealing performance between the valve core inner protrusion and the outer side face of the second guide shaft is improved.
13. The second inner sliding cavity of the valve sleeve is in sealing sliding fit connection with the outer side surface of the outer cylinder body through the fourth sealing ring, so that the tightness between the second inner sliding cavity of the valve sleeve and the outer side surface of the outer cylinder body is improved.
14. The annular lower bulge on the lower end surface of the cover plate is in sealing connection with the upper end of the valve sleeve through the fifth sealing ring, so that the sealing property between the cover plate and the valve sleeve is improved.
15. The upper end of the inner cylinder body is higher than the upper end of the outer cylinder body, and the annular avoidance opening is formed in the inner side surface of the annular lower bulge, so that the valve core is avoided when the inner cylinder body moves upwards, the structure is compact, and the cost is saved.
Drawings
FIG. 1 is a schematic diagram of the overall cross-sectional structure of a high flow throttling buffer cartridge valve according to an embodiment of the present invention in a downward motion.
Fig. 2 is a partially enlarged schematic view of the portion a in fig. 1.
FIG. 3 is a schematic diagram of an overall cross-section of a high flow throttling buffer cartridge valve in a hammer-lifting state according to an embodiment of the invention.
FIG. 4 is a schematic diagram of the overall cross-sectional structure of a high flow throttling buffer cartridge valve according to an embodiment of the present invention in an upward motion.
Fig. 5 is a partially enlarged schematic view of the portion B in fig. 4.
FIG. 6 is a schematic diagram of the overall cross-sectional structure of a high-flow throttling buffer cartridge valve in a drop-hammer condition according to an embodiment of the present invention.
FIG. 7 is a schematic cross-sectional view of a high flow throttling buffer cartridge valve cover in accordance with an embodiment of the invention.
Reference numerals illustrate:
10. Valve cover, 11, cover plate, 111, annular lower bulge, 112, annular avoidance port, 113, first throttling buffer groove, 114, fifth sealing ring, 12, guide shaft, 121, first annular groove, 122, first guide shaft, 123, second guide shaft, 124, sealing ring, 125, nut, 126, first screw, 127, first sealing ring, 128, second sealing ring, 131, first oil duct, 132, second oil duct, 20, valve sleeve, 21, first oil port, 22, second oil port, 23, fourth sealing ring, 30, valve core, 31, inner cylinder, 311, valve core inner bulge, 312, first sealing containing cavity, 313, second sealing containing cavity, 314, third sealing ring, 32, outer cylinder, 321, second throttling buffer groove, 322, first insertion inclined plane, 33, valve core oil duct, 40, limit ring, 41, third oil port, 42, second insertion inclined plane, 51, first throttling port, 52, second throttling port.
Detailed Description
The following describes embodiments of the present invention in detail.
Referring to fig. 1 to 6, the damping buffer method of the high-flow throttling buffer cartridge valve provided by the invention comprises the following steps:
(1) The pressure oil enters the first sealed containing cavity 312 through the first oil duct 131 of the valve cover 10, the pressure oil in the first sealed containing cavity 312 applies pressure to the upper end face of the valve core inner protrusion 311 to enable the valve core 30 to move downwards, meanwhile, the oil in the second sealed containing cavity 313 gradually flows out of the second oil duct 132, the second throttling buffer groove 321 of the lower end face of the outer cylinder 32 of the valve core 30 and the upper end of the limiting ring 40 gradually approach each other along with the downward movement of the valve core 30 to form a second throttling buffer containing cavity, the end head of the upper end of the limiting ring 40 is gradually inserted into the second throttling buffer groove 321, the second throttling orifice 52 gradually reduces, the pressure oil in the second throttling buffer groove 321 gradually flows out of the second throttling orifice 52 until the second throttling orifice 52 is closed, meanwhile, the outer cylinder 32 of the valve core 30 closes the second oil ports 22, and the third oil ports 41 are communicated with the plurality of first oil ports 21 through the valve core oil duct 33; the large-flow throttling buffer cartridge valve comprises a valve cover 10, a valve sleeve 20, a valve core 30 and a limiting ring 40, wherein the valve core 30 comprises an inner cylinder 31 and an outer cylinder 32, a valve core inner protrusion 311 is arranged on the inner side wall of the inner cylinder 31, a first sealing containing cavity 312 and a second sealing containing cavity 313 are respectively arranged on the upper end face and the lower end face of the valve core inner protrusion 311, a first oil duct 131 and a second oil duct 132 are arranged in the valve cover 10, a second throttling buffer groove 321 is arranged at the lower end of the outer cylinder 32, and a second throttling port 52 is formed between the upper end head of the limiting ring 40 and a notch of the second throttling buffer groove 321;
(2) The pressure oil enters the second sealed containing cavity 313 through the second oil duct 132 of the valve cover 10, the pressure oil in the second sealed containing cavity 313 applies pressure to the lower end face of the valve core inner protrusion 311 to enable the valve core 30 to move upwards, meanwhile, the oil in the first sealed containing cavity 312 gradually flows out of the first oil duct 131, the upper end of the outer cylinder 32 and the first throttling buffer groove 113 gradually approach each other along with the upward movement of the valve core 30 to form a first throttling buffer containing cavity, the end head of the upper end of the outer cylinder 32 gradually penetrates into the first throttling buffer groove 113, the first throttling 51 gradually reduces, the pressure oil in the first throttling buffer groove 113 gradually flows out of the first throttling 51 until the first throttling 51 is closed, meanwhile, the outer cylinder 32 of the valve core 30 closes the first oil port 21, and the third oil port 41 is communicated with the plurality of second oil ports 22; wherein, the valve cover 10 comprises a cover plate 11, an annular lower bulge 111 is arranged on the lower end surface of the cover plate 11, a first throttling buffer groove 113 is arranged at the lower end of the circumferential outer side surface of the annular lower bulge 111, and a first throttling port 51 is formed between the upper end head of the outer cylinder 32 and the notch of the first throttling buffer groove 113;
(3) And (5) circularly repeating the steps (1) and (2).
According to the damping buffering method, when the valve core 30 moves upwards or downwards, a throttling buffering cavity is formed at the movement end, the throttling mouth of the throttling buffering cavity is gradually reduced by the movement of the valve core 30, so that the flow of pressure oil in the throttling buffering cavity flowing out of the throttling mouth is gradually reduced, the damping buffering is realized by gradually narrowing and transitional an oil way through the buffering and vibration reduction design of the oil way, bidirectional pressure control is adopted, the response speed is high, a cartridge valve can be controlled by only needing less pressure oil, the reversing action is irrelevant to the dynamic characteristic of flowing oil, and the flow control difference in a differential system is met; the stability of the flow is improved to meet the power and control requirements of the large pile driver.
Wherein, the inner side surface of the upper end head of the outer cylinder 32 has a first insertion inclined surface 322, the inner side surface of the upper end head of the limit ring 40 has a second insertion inclined surface 42, the first insertion inclined surface 322 and the second insertion inclined surface 42 form a first throttling mouth 51 and a second throttling mouth 52 with the notch of the first throttling buffer groove 113 and the notch of the second throttling buffer groove 321 respectively, and the damping buffer method further comprises the following steps:
When the valve core 30 moves downwards, the second insertion inclined surface 42 of the upper end head of the limiting ring 40 is gradually inserted into the second throttling buffer groove 321 at the lower end of the outer cylinder 32, the second throttling orifice 52 is gradually reduced, the pressure oil flowing out of the second throttling buffer containing cavity is gradually reduced, and the damping force of the pressure oil in the second throttling buffer containing cavity on the downward movement of the valve core 30 is gradually increased;
when the valve core 30 moves upward, the first insertion inclined surface 322 of the upper end of the outer cylinder 32 is gradually inserted into the first throttling buffer groove 113 of the lower end of the annular lower protrusion 111, the first throttling port 51 is gradually reduced, the pressure oil flowing out of the first throttling buffer containing cavity is gradually reduced, and the damping force of the pressure oil in the first throttling buffer containing cavity to the upward movement of the valve core 30 is gradually increased.
The invention respectively sets the first inserting inclined plane 322 and the second inserting inclined plane 42 on the inner side of the upper end of the outer cylinder 32 and the limit ring 40, and forms a throttling buffer containing cavity with the throttling buffer groove through the inserting inclined plane at the upward or downward movement end of the valve core 30, so that the throttling mouth is gradually reduced, the flow is gradually reduced, the damping buffer is realized, and the damping buffer performance is improved.
As shown in fig. 1 to 7, the high-flow throttling buffer cartridge valve provided by the invention comprises a valve cover 10, a valve sleeve 20, a valve core 30 and a limiting ring 40, wherein the valve cover 10 comprises a cover plate 11 and a guide shaft 12, the middle part of the lower end of the cover plate 11 is integrally connected with the guide shaft 12, an annular lower bulge 111 is arranged on the lower end surface of the cover plate 11, a first throttling buffer groove 113 is arranged at the lower end of the circumferential outer side surface of the annular lower bulge 111, a first annular groove 121 is circumferentially arranged in the middle part of the guide shaft 12, the valve core 30 comprises an inner cylinder 31 and an outer cylinder 32, a valve core oil duct 33 is formed between the inner cylinder 31 and the outer cylinder 32, a second throttling buffer groove 321 is arranged on the lower end surface of the outer cylinder 32, a first inner cavity is formed in the inner cavity of the inner cylinder 31, a valve core inner bulge 311 is arranged on the inner side wall of the first inner cavity, the guide shaft 12 penetrates through the first inner cavity of the valve core 30 and is vertically sealed and slidingly connected with the inner cylinder 31, the valve core inner protrusion 311 is vertically and hermetically connected with the first annular groove 121 in a sliding manner, a first sealing containing cavity 312 is formed by the upper end surface of the valve core inner protrusion 311 and the lower end surface of the first annular groove 121, a second sealing containing cavity 313 is formed by the lower end surface of the valve core inner protrusion 311 and the upper end surface of the first annular groove 121, a first oil duct 131 and a second oil duct 132 are arranged in the valve cover 10, the first oil duct 131 and the second oil duct 132 are respectively communicated with the first sealing containing cavity 312 and the second sealing containing cavity 313, a second inner sliding cavity is formed by the hollow inside of the valve sleeve 20, the valve sleeve 20 is sleeved with the outer cylinder 32 through the second inner sliding cavity and is vertically and hermetically connected with the outer cylinder, the upper end of the valve sleeve 20 is sleeved with the annular lower protrusion 111 in a sealing connection with the cover plate 11, the limiting ring 40 is inserted into the lower end of the second inner sliding cavity and is hermetically connected with the lower end of the valve sleeve 20, a plurality of first oil ports 21 and a plurality of second oil ports 22 are sequentially arranged from top to bottom on the outer circumference of the valve sleeve 20, the limiting ring 40 is provided with a third oil port 41, the first oil port 21 is communicated with the third oil port 41 along the valve core oil duct 33 through the downward movement of the valve core 30, and the upper end head of the limiting ring 40 is gradually inserted into the second throttling buffer groove 321 for damping throttling buffer; the second port 22 communicates with the third port 41 by upward movement of the valve body 30, and the upper end head of the outer cylinder 32 is gradually inserted into the first throttle buffer groove 113 to damp the throttle buffer.
When the valve is used, pressure oil enters the first sealed containing cavity 312 through the first oil duct 131, the pressure oil in the first sealed containing cavity 312 applies pressure to the upper end face of the inner protrusion 311 of the valve core to enable the valve core 30 to move downwards, meanwhile, oil in the second sealed containing cavity 313 gradually flows out of the second oil duct 132, and moves downwards along with the valve core 30, the second throttling buffer groove 321 on the lower end face of the outer cylinder 32 of the valve core 30 is gradually close to the upper end of the limiting ring 40 to form a second throttling buffer containing cavity, the pressure oil in the second throttling buffer containing cavity dampens and buffers the downward movement of the valve core 30, the end head at the upper end of the limiting ring 40 is gradually inserted into the second throttling buffer groove 321 until the valve core 30 is closed, meanwhile, the outer cylinder 32 of the valve core 30 closes the second oil port 22, and the third oil port 41 is communicated with the plurality of first oil ports 21 through the valve core oil duct 33; then switching, the pressure oil enters the second sealed containing cavity 313 through the second oil duct 132, the pressure oil in the second sealed containing cavity 313 applies pressure to the lower end face of the valve core inner protrusion 311 to enable the valve core 30 to move upwards, meanwhile, the oil in the first sealed containing cavity 312 gradually flows out of the first oil duct 131, and moves upwards along with the valve core 30, the upper end of the outer cylinder 32 gradually approaches to the first throttling buffer groove 113 to form a first throttling buffer containing cavity, the pressure oil in the first throttling buffer containing cavity dampens and buffers the upward movement of the valve core 30, the end head at the upper end of the outer cylinder 32 gradually penetrates into the first throttling buffer groove 113 until the valve core 30 is closed, and meanwhile, the outer cylinder 32 of the valve core 30 closes the first oil port 21, and the third oil port 41 is communicated with a plurality of second oil ports 22; the oil feeding and the oil returning of the first oil duct 131 and the second oil duct 132 are circularly repeated, so that the hydraulic pile hammer repeatedly lifts and drops, and the energy supply and the control of the large hydraulic pile driver are realized; this large-traffic throttle buffering cartridge valve changes case 30 into straight section of thick bamboo integral type, make things convenient for processing and the assembly of case 30, practice thrift processing and assembly cost, with guiding axle 12 and valve gap 10 integrated into one piece, make the oil duct that gets into guiding axle 12, do not need sealing treatment, the structure is succinct, reduce the part quantity of guiding axle 12 installation in addition, improve the precision, avoid guiding axle 12 to appear form the position tolerance, improve result of use and performance, the stability of flow has been improved, upward or decurrent motion terminal at case 30 forms the throttle buffering appearance chamber through inserting with the throttle buffering recess, utilize the motion damping buffering of the pressure oil in the throttle buffering appearance intracavity to case 30, improve damping buffer performance, make the energy supply efficiency of cartridge valve higher.
The inner side surfaces of the upper end heads of the outer cylinder 32 and the limiting ring 40 are respectively provided with a first inserting inclined surface 322 and a second inserting inclined surface 42, the upper end of the outer cylinder 32 gradually approaches to the first throttling buffer groove 113 through upward movement of the valve core 30 to form a first throttling buffer cavity, the first inserting inclined surface 322 of the upper end head of the outer cylinder 32 gradually inserts into the first throttling buffer groove 113 through upward movement of the valve core 30, and a first throttling orifice 51 of the first throttling buffer cavity is formed between the first inserting inclined surface 322 and a notch of the first throttling buffer groove 113; the second throttling buffer groove 321 on the lower end surface of the outer cylinder 32 moves downwards through the valve core 30 and gradually approaches to the upper end of the limiting ring 40 to form a second throttling buffer containing cavity, the second inserting inclined surface 42 on the upper end head of the limiting ring 40 gradually inserts into the second throttling buffer groove 321 through the downward movement of the valve core 30, and a second throttling orifice 52 of the second throttling buffer containing cavity is formed between the second inserting inclined surface 42 and the notch of the second throttling buffer groove 321. The inner side surfaces of the upper end heads of the outer cylinder 32 and the limiting ring 40 are respectively provided with a first inserting inclined surface 322 and a second inserting inclined surface 42, the first inserting inclined surface 322 and the second inserting inclined surface 42 are respectively inserted into the first throttling buffer groove 113 and the second throttling buffer groove 321 in a moving way, a first throttling opening 51 and a second throttling opening 52 which are gradually reduced in moving way are formed, the throttling opening is gradually reduced to gradually reduce pressure oil flowing out of the throttling opening, so that the moving resistance of the pressure oil in the throttling buffer containing cavity to the valve core 30 is gradually increased, damping buffer is realized, and the damping buffer performance is improved.
The guide shaft 12 comprises a first guide shaft 122, a second guide shaft 123, a sealing ring 124, a nut 125 and a first screw 126, wherein the second guide shaft 123 is integrally connected with the middle part of the lower end of the cover plate 11 through the first guide shaft 122, the second guide shaft 123 is smaller than the first guide shaft 122, the sealing ring 124 is arranged at the lower end of the second guide shaft 123, and a first annular groove 121 is formed in the upper end face of the sealing ring 124, the outer side face of the second guide shaft 123 and the lower end face of the first guide shaft 122. The upper end face of the sealing ring 124, the outer side face of the second guide shaft 123 and the lower end face of the first guide shaft 122 form a first annular groove 121, and since the second guide shaft 123 is smaller than the first guide shaft 122 and is integrally formed with the first guide shaft 122, a step formed between the first guide shaft 122 and the second guide shaft 123 is the upper side face of the first annular groove 121, when the valve is installed, the second guide shaft 123 is inserted into the first inner sliding cavity from the upper end of the inner cylinder 31 of the valve core 30, so that the inner protrusion 311 of the valve core is in sealing sliding fit connection on the outer side face of the second guide shaft 123, and then the sealing ring 124 is installed from the lower end of the second guide shaft 123, thereby facilitating the assembly of the guide shaft 12.
The lower end of the second guide shaft 123 is provided with external threads, the external threads of the second guide shaft 123 are matched with the nut 125, the lower end of the second guide shaft 123 sequentially penetrates through the sealing ring 124 to be in threaded connection with the nut 125, and the upper end face of the nut 125 abuts against the lower end face of the tight sealing ring 124. Facilitating the secure installation of the seal ring 124.
The outer side wall of the nut 125 is provided with a first through hole, the lower end of the second guide shaft 123 is provided with a screw hole in an external thread, and the first screw 126 passes through the first through hole and is in threaded connection with the screw hole in a matching manner. The nut 125 is further anchored to the lower end of the second guide shaft 123 by the first screw 126, preventing the nut 125 from being loosened.
The first inner sliding cavity sequentially comprises a first section inner sliding cavity and a second section inner sliding cavity from top to bottom, the valve core inner protrusion 311 is located between the first section inner sliding cavity and the second section inner sliding cavity, and the first section inner sliding cavity, the valve core inner protrusion 311 and the second section inner sliding cavity are respectively connected with the first guide shaft 122, the second guide shaft 123 and the sealing ring 124 in a vertical sealing sliding fit manner. The first segment inner sliding cavity, the valve core inner protrusion 311 and the second segment inner sliding cavity are respectively connected with the first guide shaft 122, the second guide shaft 123 and the sealing ring 124 in a vertical sealing sliding fit manner, so that the sealing sliding fit between the inner cylinder 31 of the valve core 30 and the guide shaft 12 is more stable.
Preferably, the guide shaft 12 further includes a first sealing ring 127 and a second sealing ring 128, a first groove is circumferentially arranged on the outer side surface of the first guide shaft 122, the first sealing ring 127 is installed on the first groove, and the first guide shaft 122 is in sealing sliding fit connection with the first section inner sliding cavity through the first sealing ring 127. Improving the seal between the first guide shaft 122 and the inner lumen of the first segment.
The outer side surface of the sealing ring 124 is circumferentially provided with a second groove, a second sealing ring 128 is arranged on the second groove, and the sealing ring 124 is in sealing sliding fit connection with the inner sliding cavity of the second segment through the second sealing ring 128. Improving the tightness between the sealing ring 124 and the inner cavity in the second segment.
The valve core 30 further comprises a third sealing ring 314, a third groove is circumferentially arranged on the inner side surface of the valve core inner protrusion 311, the third sealing ring 314 is installed on the third groove, and the valve core inner protrusion 311 is in sealing sliding fit connection with the outer side surface of the second guide shaft 123 through the third sealing ring 314. The sealability between the valve core inner protrusion 311 and the outer side surface of the second guide shaft 123 is improved.
The large-flow throttling buffer cartridge valve further comprises a fourth sealing ring 23 and a fifth sealing ring 114, wherein a fourth groove is formed in the circumference of the inner side wall of the valve sleeve 20 and located between the first oil port 21 and the second oil port 22, the fourth sealing ring 23 is arranged on the fourth groove, and a second inner sliding cavity of the valve sleeve 20 is connected with the outer side face of the outer cylinder 32 in a sealing sliding fit manner through the fourth sealing ring 23. The tightness between the second inner lumen of the valve sleeve 20 and the outer lateral surface of the outer cylinder 32 is improved.
The lower end surface of the cover plate 11 is provided with an annular lower bulge 111, the circumferential outer side surface of the annular lower bulge 111 is provided with a fifth groove, a fifth sealing ring 114 is arranged on the fifth groove, the cover plate 11 is inserted into the upper end of the second inner sliding cavity of the valve sleeve 20 through the annular lower bulge 111, and the annular lower bulge 111 is in sealing connection with the upper end of the valve sleeve 20 through the fifth sealing ring 114. The sealability between the cover plate 11 and the valve housing 20 is improved.
The inner side surface of the annular lower bulge 111 and the guide shaft 12 form an annular avoidance port 112, the upper end height of the inner cylinder 31 is larger than the upper end height of the outer cylinder 32, and the inner cylinder 31 movably extends into the annular avoidance port 112. In the invention, the upper end of the inner cylinder 31 is higher than the upper end of the outer cylinder 32, and the annular avoidance opening 112 is arranged on the inner side surface of the annular lower bulge 111, so that the valve core 30 is avoided when the inner cylinder 31 moves upwards, the structure is compact, and the cost is saved.
According to the damping buffer method of the large-flow throttling buffer cartridge valve and the cartridge valve, provided by the invention, the structure and the process are synchronously improved, so that the functional output and the stability are improved, and the damping buffer method is suitable for heavy hydraulic piling equipment.
The foregoing is merely exemplary embodiments of the present invention, and is not intended to limit the scope of the present invention; any substitutions and modifications made without departing from the spirit of the invention are within the scope of the invention.
Claims (6)
1. The damping buffer method of the large-flow throttling buffer cartridge valve is characterized in that the large-flow throttling buffer cartridge valve is adopted, the large-flow throttling buffer cartridge valve comprises a valve cover, a valve sleeve, a valve core and a limiting ring, the valve cover comprises a cover plate and a guide shaft, the middle part of the lower end of the cover plate is integrally connected with the guide shaft, an annular lower bulge is arranged on the lower end face of the cover plate, a first throttling buffer groove is arranged at the lower end of the circumferential outer side face of the annular lower bulge, a first annular groove is circumferentially arranged on the middle part of the guide shaft, the valve core comprises an inner cylinder body and an outer cylinder body, a valve core oil duct is formed between the inner cylinder body and the outer cylinder body, a second throttling buffer groove is formed on the lower end face of the outer cylinder body, a first inner sliding cavity is formed in the inner cylinder body, a valve core inner bulge is arranged on the inner side wall of the first inner sliding cavity, the guide shaft penetrates through the first inner sliding cavity of the valve core and is vertically and slidably connected with the first annular groove, the upper end face of the inner cylinder body and the upper end face of the first inner cylinder body and the first sliding cavity are vertically connected with the first sliding cavity in a sliding mode, a second sliding groove is formed on the inner side face of the inner cylinder body and the second sliding cavity is communicated with the first sliding cavity through the first inner cavity and the first sliding cavity and the second sliding cavity, the first sliding cavity is formed on the inner cavity and the second sliding cavity is formed with the second sliding cavity, the limiting ring is inserted into the lower end of the second inner sliding cavity and is in sealing connection with the lower end of the valve sleeve, a plurality of first oil ports and a plurality of second oil ports are sequentially arranged on the outer circumference of the valve sleeve from top to bottom, the limiting ring is provided with a third oil port, the first oil port is communicated with the third oil port along the valve core oil duct through downward movement of the valve core, and the upper end head of the limiting ring is gradually inserted into the second throttling buffer groove for damping throttling buffer; the second oil port is communicated with the third oil port through upward movement of the valve core, and the upper end head of the outer cylinder body is gradually inserted into the first throttling buffer groove for damping throttling buffer;
The inner side surfaces of the upper end heads of the outer cylinder body and the limiting ring are respectively provided with a first inserting inclined surface and a second inserting inclined surface, the upper end of the outer cylinder body gradually approaches to the first throttling buffer groove through upward movement of the valve core to form a first throttling buffer containing cavity, the first inserting inclined surface of the upper end head of the outer cylinder body gradually inserts into the first throttling buffer groove through upward movement of the valve core, and a first throttling orifice of the first throttling buffer containing cavity is formed between the first inserting inclined surface and a notch of the first throttling buffer groove; the second throttling buffer groove on the lower end surface of the outer cylinder body gradually approaches to the upper end of the limiting ring through the downward movement of the valve core to form a second throttling buffer accommodating cavity, the second inserting inclined surface of the upper end head of the limiting ring gradually inserts into the second throttling buffer groove through the downward movement of the valve core, and a second throttling orifice of the second throttling buffer accommodating cavity is formed between the second inserting inclined surface and the notch of the second throttling buffer accommodating cavity;
The guide shaft comprises a first guide shaft, a second guide shaft, a sealing ring and a nut, wherein the second guide shaft is integrally connected with the middle part of the lower end of the cover plate through the first guide shaft, the second guide shaft is smaller than the first guide shaft, the sealing ring is arranged at the lower end of the second guide shaft, and the upper end face of the sealing ring, the outer side face of the second guide shaft and the lower end face of the first guide shaft form a first annular groove; the lower end of the second guide shaft is provided with external threads, the external threads of the second guide shaft are matched with the nut, the lower end of the second guide shaft sequentially penetrates through the sealing ring to be in threaded connection with the nut, and the upper end face of the nut abuts against the lower end face of the sealing ring;
the damping buffer method of the large-flow throttling buffer cartridge valve comprises the following steps:
(1) The pressure oil enters a first sealed containing cavity through a first oil duct of a valve cover, the pressure oil in the first sealed containing cavity applies pressure to the upper end face protruding in the valve core to enable the valve core to move downwards, meanwhile, the oil in a second sealed containing cavity gradually flows out of a second oil duct and moves downwards along with the valve core, a second throttling buffer groove on the lower end face of an outer cylinder body of the valve core is gradually close to the upper end of a limiting ring to form a second throttling buffer containing cavity, the end head of the upper end of the limiting ring is gradually inserted into the second throttling buffer groove, the second throttling orifice is gradually reduced, the pressure oil in the second throttling buffer groove gradually flows out of the second throttling orifice until the second throttling orifice is closed, meanwhile, an outer cylinder body of the valve core seals a second oil port, and a third oil port is communicated with a plurality of first oil ports through the valve core oil duct; the high-flow throttling buffer cartridge valve comprises a valve cover, a valve sleeve, a valve core and a limiting ring, wherein the valve core comprises an inner cylinder body and an outer cylinder body, a valve core inner protrusion is arranged on the inner side wall of the inner cylinder body, a first sealing containing cavity and a second sealing containing cavity are respectively arranged on the upper end face and the lower end face of the valve core inner protrusion, a first oil duct and a second oil duct are arranged in the valve cover, a second throttling buffer groove is formed in the lower end of the outer cylinder body, and a second throttling port is formed between the upper end head of the limiting ring and a notch of the second throttling buffer groove;
(2) The pressure oil enters the second sealed containing cavity through the second oil duct of the valve cover, the pressure oil in the second sealed containing cavity applies pressure to the lower end face of the inner protrusion of the valve core to enable the valve core to move upwards, meanwhile, the oil in the first sealed containing cavity gradually flows out of the first oil duct and moves upwards along with the valve core, the upper end of the outer cylinder body gradually approaches the first throttling buffer groove to form a first throttling buffer containing cavity, the end head at the upper end of the outer cylinder body gradually penetrates into the first throttling buffer groove, the first throttling is gradually reduced, the pressure oil in the first throttling buffer groove gradually flows out of the first throttling orifice until the first throttling orifice is closed, and meanwhile, the outer cylinder body of the valve core seals the first oil port, and the third oil port is communicated with a plurality of second oil ports; the valve cover comprises a cover plate, an annular lower bulge is arranged on the lower end face of the cover plate, a first throttling buffer groove is formed in the lower end of the circumferential outer side face of the annular lower bulge, and a first throttling orifice is formed between the upper end head of the outer cylinder body and the notch of the first throttling buffer groove;
(3) And (5) circularly repeating the steps (1) and (2).
2. The damping buffer method of a high-flow throttling buffer cartridge valve as set forth in claim 1, wherein the inner side surface of the upper end head of the outer cylinder has a first insertion inclined surface, the inner side surface of the upper end head of the limit ring has a second insertion inclined surface, and the first insertion inclined surface and the second insertion inclined surface form the first throttling port and the second throttling port with the notch of the first throttling buffer groove and the notch of the second throttling buffer groove, respectively, the damping buffer method further comprising the steps of:
When the valve core moves downwards, the second insertion inclined surface of the upper end head of the limiting ring is gradually inserted into the second throttling buffer groove at the lower end of the outer cylinder body, the second throttling orifice is gradually reduced, pressure oil flowing out of the second throttling buffer containing cavity is gradually reduced, and damping force of the pressure oil in the second throttling buffer containing cavity on the downward movement of the valve core is gradually increased;
When the valve core moves upwards, the first insertion inclined surface of the upper end head of the outer cylinder body is gradually inserted into the first throttling buffer groove at the lower end of the annular lower bulge, the first throttling orifice is gradually reduced, pressure oil flowing out of the first throttling buffer containing cavity is gradually reduced, and the damping force of the pressure oil in the first throttling buffer containing cavity on the upward movement of the valve core is gradually increased.
3. A high-flow throttling buffer cartridge valve for implementing the damping buffer method according to any one of claims 1 to 2, characterized in that the first inner sliding cavity sequentially comprises a first section inner sliding cavity and a second section inner sliding cavity from top to bottom, the inner protrusion of the valve core is positioned between the first section inner sliding cavity and the second section inner sliding cavity, and the first section inner sliding cavity, the inner protrusion of the valve core and the second section inner sliding cavity are respectively in vertical sealing sliding fit connection with the first guide shaft, the second guide shaft and the sealing ring.
4. The high-flow throttling buffer cartridge valve of claim 3 wherein the valve core further comprises a third sealing ring, a third groove is circumferentially arranged on the inner side surface of the inner protrusion of the valve core, the third sealing ring is arranged on the third groove, and the inner protrusion of the valve core is in sealing sliding fit connection with the outer side surface of the second guide shaft through the third sealing ring.
5. The high flow rate throttling buffer cartridge valve of any of claims 3-4, further comprising a fourth seal ring, wherein a fourth groove is circumferentially arranged on the inner side wall of the valve sleeve, the fourth groove is positioned between the first oil port and the second oil port, the fourth seal ring is mounted on the fourth groove, and the second inner sliding cavity of the valve sleeve is in sealing sliding fit connection with the outer side surface of the outer cylinder body through the fourth seal ring.
6. A high flow rate throttling buffer cartridge valve as claimed in any of claims 3 to 4 further comprising a fifth sealing ring, wherein an annular lower protrusion is provided on a lower end surface of said cover plate, a fifth groove is provided on a circumferential outer side surface of said annular lower protrusion, said fifth sealing ring is mounted on said fifth groove, said cover plate is inserted into an upper end of a second inner sliding chamber of said valve housing through said annular lower protrusion, and said annular lower protrusion is sealingly connected with an upper end of said valve housing through said fifth sealing ring.
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| KR20020091915A (en) * | 2001-06-01 | 2002-12-11 | 유겐가이샤 크루즈 | Suspension apparatus |
| CN101070891A (en) * | 2007-06-15 | 2007-11-14 | 北京理工大学 | Throttling valve sheet group of oil-gas spring |
| CN102535465A (en) * | 2010-12-23 | 2012-07-04 | 上海工程机械厂有限公司 | Hydraulic pneumatic composite pile hammer |
| CN202091279U (en) * | 2011-06-01 | 2011-12-28 | 宁波克泰液压有限公司 | Thread cartridge buffering overflow valve |
| CN103883576A (en) * | 2013-12-31 | 2014-06-25 | 三一汽车起重机械有限公司 | Pounder hydraulic system and engineering machinery |
| CN105697832A (en) * | 2016-04-19 | 2016-06-22 | 龙工（上海）精工液压有限公司 | Safety valve with buffer performance |
| CN105927606A (en) * | 2016-06-23 | 2016-09-07 | 广东力源液压机械有限公司 | Hydraulic piling system and cartridge valve thereof |
| CN106050780A (en) * | 2016-07-19 | 2016-10-26 | 宁波文泽机电技术开发有限公司 | Flow type balance valve |
| CN108385684A (en) * | 2018-03-22 | 2018-08-10 | 广东力源液压机械有限公司 | A kind of the hammer core buffer control method and combined hammer core buffer unit of hydraulic pile driver |
| CN108239979A (en) * | 2018-03-30 | 2018-07-03 | 江苏巨威机械有限公司 | The big energy hydraulic pile hammer of high frequency |
| CN109162977A (en) * | 2018-10-19 | 2019-01-08 | 宁波文泽机电技术开发有限公司 | Rotary buffering valve |
| CN211599133U (en) * | 2019-12-30 | 2020-09-29 | 广东力源液压机械有限公司 | Large-flow throttling buffer cartridge valve |
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