CN106151143B - Luffing jib maintaining valve - Google Patents
Luffing jib maintaining valve Download PDFInfo
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- CN106151143B CN106151143B CN201610559958.3A CN201610559958A CN106151143B CN 106151143 B CN106151143 B CN 106151143B CN 201610559958 A CN201610559958 A CN 201610559958A CN 106151143 B CN106151143 B CN 106151143B
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- fluid ports
- passages
- overflow
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- 239000012530 fluid Substances 0.000 claims abstract description 118
- 230000007246 mechanism Effects 0.000 claims abstract description 55
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 26
- 230000033228 biological regulation Effects 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 12
- 239000003921 oil Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- 239000010720 hydraulic oil Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 2
- 230000009699 differential effect Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a kind of luffing jib maintaining valve, including valve body, pilot mechanism, main valve plug and overflow mechanism are provided with the valve body, and formed with F passages, J passages, L * channel, H passages, X hydraulic fluid ports, V hydraulic fluid ports and C hydraulic fluid ports in valve body；When V hydraulic fluid port oil-feeds make main valve plug overcome main spring active force to open, V hydraulic fluid ports connect with C hydraulic fluid ports；Conversely, main valve plug is closed in linear sealing, do not connected between V hydraulic fluid ports and C hydraulic fluid ports；When X hydraulic fluid port oil-feeds open pilot mechanism, C hydraulic fluid ports, the triangular groove of main valve plug, J passages, F passages and V hydraulic fluid ports are formed and connected, and when pilot mechanism is closed, J passages are blocked with F passages；When overflow mechanism is opened, C hydraulic fluid ports, H passages and L * channel are formed and connected, conversely, H passages are blocked with L * channel.The luffing jib maintaining valve can cause swing arm to be held in place and control swing arm without impact when the swing arm action bars of excavator returns to middle position.
Description
Technical field
The present invention relates to control valve technical field, more particularly to a kind of luffing jib maintaining valve for hydraulic crawler excavator.
Background technology
Common hydraulic crawler excavator, its movable arm hydraulic cylinder is directly connected with boom control valves, directly by boom control valves
To control the rising of swing arm, decline and holding.Hydraulic crawler excavator may control for various reasons after scraper bowl is lifted off into ground
The reversal valve of swing arm or dipper hydraulic cylinder is returning briefly to middle position, and now engine is in idling mode again, if now reversal valve
Because between valve element and valve body gap it is excessive caused by leak, equipment can also decline automatically under Gravitative Loads.When scraper bowl is built-in
Full with substance or when slinging weight with the suspension hook on scraper bowl, equipment declines automatically often to lead to a disaster.It is meanwhile oily when occurring
During pipe explosion, unexpected decline occurs in swing arm, potential safety hazard be present.
Patent publication No. provides for the patent of invention of CN101294402 entitled " luffing jib maintaining valve for hydraulic shovel "
A kind of luffing jib maintaining valve, though its anti-stopper arms of energy declines naturally, had the following disadvantages in engineer applied：(1) control is dynamic
The valve rod that arm declines is simple conical surface excessively stream, and area of passage graded is big, the changes in flow rate amplitude in pilot handle control
Greatly, impact shock is particularly easily produced under heavy loads.(2) by setting damping hole in overflow valve oil return circuit, using overflow
Valve overflow return pressure is flowed to control valve rod to open, and realizes that overflow is protected.Such words overflow valve opening pressure is by return oil pressure
Influence, it is impossible to play safeguard protection effect well；Rushed big, overflow valve return oil pressure drop by liquid stream using damping hole for a long time
Low, valve rod cannot be opened, poor reliability；Overflow valve is opened also with the valve rod conical surface, and valve element one is opened in, overload pressure
Power declines (open area is excessive) at once, and swing arm quickly sinks, and then closes and impacts suddenly again.(3) each face of valve body is all
Need to process, function element is distributed on each face of valve body, and manufacturing process is complicated, and cost is high.
The content of the invention
The defects of it is an object of the invention to overcome prior art, there is provided a kind of swing arm simple in construction, inexpensive is kept
Valve, the luffing jib maintaining valve can cause swing arm to be held in place when the swing arm action bars of excavator returns to middle position, and energy can
Flood protection feature is played by ground, and control is declined without impact to swing arm.
For above technical problem, technical solution of the invention is to provide a kind of luffing jib maintaining valve, including valve body,
Pilot mechanism, main valve plug and overflow mechanism are provided with valve body, and is led in valve body formed with F passages, J passages, L * channel, H
Road, X hydraulic fluid ports channel attached with hydraulic control, the V hydraulic fluid ports being connected with reversal valve and the C hydraulic fluid ports being connected with hydraulic cylinder rodless cavity；When V oil
When mouthful oil-feed makes the main valve plug overcome the main spring active force to open, V hydraulic fluid ports connect with C hydraulic fluid ports；Conversely, main valve plug closes in linear sealing
Close, do not connected directly between V hydraulic fluid ports and C hydraulic fluid ports；When X hydraulic fluid port oil-feeds open pilot mechanism, C hydraulic fluid ports, the triangle of main valve plug
Groove, J passages, F passages and V hydraulic fluid ports are formed and connected, and when pilot mechanism is closed, J passages are blocked with F passages；When overflow mechanism is opened
Qi Shi, C hydraulic fluid port, H passages and L * channel are formed and connected, conversely, H passages are blocked with L * channel.Herein, the oil-feed of V hydraulic fluid ports makes main valve
Core overcome main spring active force open it is main corresponding to when be that swing arm rises, hydraulic oil is flowed into by V hydraulic fluid ports, is applied to main valve
On core, the active force of main spring is overcome to open valve element top, entering hydraulic cylinder rodless cavity through C hydraulic fluid ports promotes swing arm to rise.Guide's machine
Structure open it is main corresponding to when being that swing arm declines, pilot pressure increase to a certain extent when, main valve plug is opened under pressure differential effect
Open, now the aperture of main valve plug is mainly determined by the pilot pressure of X hydraulic fluid ports.Because the aperture of main valve plug and pilot valve is slow
Change, therefore do not allow to be also easy to produce vibration.When swing arm rises or falls stopping, X hydraulic fluid port pressure is laid down, and pilot mechanism is closed,
The lower main valve plug of pressure effect of main spring and J passages is closed naturally, and because main valve plug is linear sealing No leakage, swing arm is not in
Naturally decline.
In one embodiment of the invention, the pilot mechanism installation cavity of X hydraulic fluid ports connection valve body, a passage of V hydraulic fluid ports
Connect main valve plug installation cavity one end, one end of another passage connection F passages of V hydraulic fluid ports, other end connection guide's machine of F passages
Structure installation cavity, one end connection pilot mechanism installation cavity of J passages are simultaneously blocked with F passages when pilot mechanism is closed, J passages
The other end is connected to main valve plug installation cavity.Herein J passages and F passages be blocked when pilot mechanism is closed it is main also in that its
In pilot valve be linear sealing structure, leakage is not present in pilot valve and the cooperation of guide's valve seat.
In a preferred embodiment of the invention, pilot mechanism installation cavity is provided with guide's valve seat, and pilot mechanism includes
Piston, pilot valve, guide's spring and guide's spring base are controlled, guide's valve seat is sequentially provided with since close to one end of X hydraulic fluid ports
Shoulder hole and the channel attached a chambers of F and the channel attached b chambers of J and guide's spring cavity, control piston is in valve body and guide's valve seat
Big intracavitary in the shoulder hole that end is formed can simultaneously be slidably reciprocated, and one end of pilot valve, which is connected to, to be controlled on piston, the other end
Sequentially pass through a chambers, b chambers, the cushion block that is located at b intracavitary to abut to and be located on guide's spring base of guide's spring cavity, guide's spring base
Guide's spring is connected with backwards to the one side of pilot valve, guide's spring one end abuts guide's spring base, and the other end is connected to guide
In the cavity wall of spring cavity.Pilot valve is moved under the promotion of X hydraulic fluid ports pressure and opened, the first guided missile after X hydraulic fluid port pressure is laid down
The lower pilot valve of restoring force effect of spring is closed.
In one embodiment of the invention, pilot valve is located at the circular cone that protrusion is provided with the part of b intracavitary, first
Guide valve core, which is opened, refers to that the circular cone moves in b intracavitary to the direction away from a chambers so that a chambers connect with b chambers；Pilot valve is closed
Close and refer to that the circular cone blocks b chambers close to the passway of the side of a chambers, cut-off a chambers and b chambers so that fluid can not be again in a chambers
Circulated between b chambers.Because the circular cone and guide's valve seat form linear sealing, in the absence of leakage, thus can prevent from stopping in swing arm
Decline naturally caused by leakage when only.
In one embodiment of the invention, guide's spring cavity is connected with guide's valve pocket by guide's valve seat and formed, pilot valve
Seat is fixed to be located in the pilot mechanism installation cavity of valve body formation, and guide's valve pocket is tightly connected away from X hydraulic fluid ports and with valve body screw thread, first
The other end of guided missile spring is connected to pilot valve and put.
In one embodiment of the invention, pilot valve, which is put, is also associated with governor motion, and governor motion passes through to guide
The regulation of tensioned degree so as to play a part of adjust pilot valve Opening pressure size.
In one embodiment of the invention, a direction of C hydraulic fluid ports connects main valve plug installation cavity and closed in main valve plug
When separate with V hydraulic fluid ports, the one end of main valve plug installation cavity away from V hydraulic fluid ports is provided with the triangular groove that is connected with J passages, and main valve plug is backwards to V
Spring cavity is provided with one end of hydraulic fluid port, the main spring in spring cavity makes main valve plug produce the effect for closing main valve plug
Power.
In a preferred embodiment of the invention, another direction connection H passages of C hydraulic fluid ports, H passages connection overflow machine
Structure, overflow mechanism include relief valve seat, overflow valve element, steel ball, overflow spring base, overflow spring, overflow valve pocket, adjusting set and tune
Save nut, the inner chamber of relief valve seat is sliding combined with overflow valve element, one end of overflow valve element slide be located at connect with H passages it is excessive
The inner chamber of valve seat is flowed, the inner chamber that the other end passes relief valve seat abuts overflow spring base, overflow by being located at the steel ball of its end
Spring base is socketed with overflow spring backwards to one end of overflow valve element, and overflow spring is located in adjusting set, and one end abuts overflow spring
Seat, the other end abut adjusting set, and overflow valve set is socketed with outside adjusting set and end is connected with adjusting nut, overflow valve pocket and valve body
Thread seal connects.The tensioning degree of overflow spring is can adjust by adjusting nut and adjusting set, makes overflow so as to play regulation
The effect for the oil pressure relief that valve element is opened.The unlatching of overflow mechanism is also to relax to open stage by stage, and main frame will not be impacted
Vibration.
In a preferred embodiment of the invention, emergency valve is additionally provided with close to overflow mechanism on valve body, emergency valve leads to
The a portion of road through H passages is connected with C hydraulic fluid ports.When guide's missing handle or engine stop work, tune can be passed through
Section emergency valve puts down swing arm.
In one embodiment of the invention, main valve plug includes being sequentially connected stepped head, middle part and end, head
The front end in portion is that round table-like, head afterbody is cylindric and throttling channel is provided with head；Head passes through the first mistake with middle part
Cross structure connection, middle part is connected with end by the second transition structure, the second transition structure with end formed with section from big
To small triangular groove.Main valve plug both ends are respectively arranged with throttling channel and triangular groove, can play preferable cushioning effect, therefore,
Either main valve plug is opened or dwell period, flow are all moderate changes, is not in impact shock.
Beneficial effects of the present invention are as follows：
Because during swing arm decline, pilot mechanism and main valve plug are gently to open, and main valve plug is opened in the present invention
Degree depends primarily on the pressure size of X hydraulic fluid ports, can greatly reduce the impact during swing arm declines.In addition, in excavator
Swing arm action bars return to middle position, when swing arm stops, X hydraulic fluid port pressure is laid down, and pilot mechanism closes No leakage, and main valve plug is in main bullet
The pressure differential effect of the restoring force and V hydraulic fluid ports of spring and J passages it is lower it is reliable close, and because main valve plug is that linear sealing is not present and let out
Leakage, can be held in place swing arm.Overflow mechanism is directly opened by the Stress control of C hydraulic fluid ports, and because main valve plug is provided with three
Chamfered groove and U-type groove, relief function can not only be reliably completed, also to main frame without impact.In addition, overall structure of the present invention is simple,
Each function parts layout is concentrated, and processing cost is low.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly introduced.It should be evident that drawings discussed below is only some embodiments of the present invention, for ability
For the those of ordinary skill in domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing.
Fig. 1 show the structural representation of the luffing jib maintaining valve one of which embodiment of the present invention；
Fig. 2 show the principle schematic of the luffing jib maintaining valve in Fig. 1；
It is the principle schematic using a kind of hydraulic circuit of luffing jib maintaining valve of the present invention shown in Fig. 3；
It is the structural representation of the main valve plug in Fig. 1 shown in Fig. 4；
It is the schematic diagram of the part structure for amplifying in Fig. 1 shown in Fig. 5.
In figure：1st, valve body, 2, control piston, 3, guide's valve seat, 4, pilot valve, 5, cushion block, 6, guide's spring base, 7, first
Guided missile spring, 8, guide's valve pocket, the 9, first adjusting set, 10, locking nut, 11, spacing adjusting rod, 12, sealing nut, 13, regulation
Nut, the 14, second adjusting set, 15, overflow valve pocket, 16, overflow spring base, 17, emergency valve, 18, overflow spring, 19, steel ball,
20th, overflow valve element, 21, relief valve seat, 22, main spring, 23, main valve plug, 24, main valve housing, 25, triangular groove, 26, U-type groove, 27,
First hole, the 28, second hole.
Embodiment
In order that the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Exemplary embodiment be described in further detail.Obviously, described embodiment is only the part implementation of the present invention
Example, rather than the exhaustion of all embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The all other embodiment obtained under the premise of the property made work, falls within the scope of protection of the invention.
In one embodiment of the invention, a kind of luffing jib maintaining valve is given, as depicted in figs. 1 and 2, the swing arm is kept
Valve mainly includes valve body 1, in the valve body 1 or be connected on valve body 1 pilot mechanism (or pilot valve), main valve plug 23, overflow
Flow mechanism (or overflow valve) and emergency valve 17.In addition, valve body 1 in formed with X hydraulic fluid ports, C hydraulic fluid ports, V hydraulic fluid ports, F passages, J passages,
L * channel and H passages.As shown in figure 1, X hydraulic fluid ports and V hydraulic fluid ports are each provided at the left side of valve body 1, C hydraulic fluid ports are located at the lower left of valve body 1.X
The left end of the pilot mechanism installation cavity of hydraulic fluid port connection valve body 1, the axial directions of V hydraulic fluid ports correspond to main valve plug 23, V hydraulic fluid ports another
Direction connects one end of F passages, and F passages are made up of three parts, the other end connection pilot mechanism installation cavity of F passages.J passages
One end connects pilot mechanism installation cavity and is blocked with F passages when pilot valve is closed, and the other end of J passages is connected to main valve
Core installation cavity.C hydraulic fluid ports are radially arranged, and the principal direction of C hydraulic fluid ports is perpendicular to main valve plug installation cavity and oily with V when main valve plug 23 is closed
Mouth cut-off.The other direction of C hydraulic fluid ports is provided with passage H, and passage H is connected with overflow mechanism (or overflow valve).
In a preferred embodiment of the invention, guide's valve seat 3, Xian Daoji are mainly provided with pilot mechanism installation cavity
Structure and guide's valve pocket 8.Wherein, pilot mechanism mainly includes control piston 2, pilot valve 4, guide's spring base 6 and guide's spring
7.Guide's valve seat 3 is sequentially provided with shoulder hole and the channel attached a of F since close to one end (i.e. left end in Fig. 1) of X hydraulic fluid ports
Chamber and the channel attached b chambers of J and guide's spring cavity.Piston 2 is controlled in the shoulder hole that valve body 1 and the end of guide's valve seat 3 are formed
Big intracavitary, control piston 2 X hydraulic fluid ports pressure effect under can be slidably reciprocated along big chamber.One end of pilot valve 4 is connected to control
On piston 2, the other end sequentially passes through shoulder hole, a chambers, b chambers, the cushion block 5 that is located at b intracavitary and abuts to the elder generation for being located at guide's spring cavity
On guided missile spring abutment 6.Guide's spring base 6 is provided with smooth protrusion towards one end of pilot valve 4, and with the end of pilot valve 4
Recess formed and coordinate, this cooperation can reduce impact.Guide's spring base 6 is cylindric, guide backwards to the one side of pilot valve 4
Spring 7 is socketed on the cylindrical-shaped structure and abutted on the shoulder of guide's spring base 6.The other end of guide's spring 7 abuts first
Lead on the inwall of spring cavity.When X hydraulic fluid port pressure reaches Opening pressure, pilot valve 4 is acted on control piston 2 in X hydraulic fluid ports
Active force promote under move and open to the right.After X hydraulic fluid port pressure is laid down, the restoring force of the first guided missile spring 7 of pilot valve 4
Effect is lower to close.
In a preferred embodiment of the invention, pilot valve 4 is located at the taper that protrusion is provided with the part of b intracavitary
Block.Pilot valve 4, which is opened, refers to that the circular cone moves in b intracavitary to the direction (being to the right in Fig. 1) away from a chambers, and it is left to open b chambers
The passway of side so that a chambers connect with b chambers, and the fluid of J passages can flow out through b chambers, a chambers, F passages, V hydraulic fluid ports successively.Guide
Valve element 4, which is closed, refers to that the circular cone blocks b chambers close to the passway of the side of a chambers (i.e. on the left of b chambers in Fig. 1), separates a chambers
With b chambers so that fluid can not flow out through J passages, a chambers, b chambers, F passages again.Due to when pilot valve 4 is closed, the circular cone
Linear sealing is formed with guide's valve seat 3, in the absence of leakage, thus can prevent from because the pilot mechanism leaks causing when swing arm stops
It is natural decline.
In one embodiment of the invention, guide's spring cavity is connected by guide's valve seat 3, guide's valve pocket 8 and governor motion
Connect to be formed.Guide's valve seat 3, which is fixed, to be located in the pilot mechanism installation cavity of the formation of valve body 1.Guide's valve pocket is away from X hydraulic fluid ports and and valve body
1 thread seal connects.Guide's valve pocket 8 is also associated with governor motion, and the governor motion mainly includes the first adjusting set 9, spacing tune
Pole 11, locking nut 10 and sealing nut 12.First adjusting set 9 is threaded in guide's valve pocket 8, and spacing adjusting rod 11 connects
The first adjusting set 9 is connected on, the screw thread of locking nut 10 is socketed in the first adjusting set 9, and sealing nut 12 is socketed in spacing adjusting rod
11 and it is fixedly connected with the first adjusting set 9.The governor motion is mainly by the regulation of the tensioning degree to guide's spring 7 so as to rise
To the effect of the regulation Opening pressure size of pilot valve 4.In a preferred embodiment, pilot valve 4 and spacing adjusting rod 11 are same
Axle is set, so as to open distance according to the adjustment distance of spacing adjusting rod 11 to adjust the maximum of pilot valve 4.
In one embodiment of the invention, as shown in figure 1, main valve plug 23 with pilot valve 4 is to be arranged in parallel.
In a preferred embodiment of the invention, as shown in figure 4, main valve plug 23 is stepped including being sequentially connected
Head, middle part and end.The front end on head is that round table-like, head afterbody is cylindric and throttling channel is provided with head.Head
Portion is connected with middle part by First Transition structure, and middle part is connected with end by the second transition structure, the second transition structure and end
Triangular groove 25 in portion formed with section from big to small.The both ends of main valve plug 23 are respectively arranged with U-type groove 26 and triangular groove 25 (can
Referring to Fig. 4 and Fig. 5), preferable cushioning effect can be played, therefore, and the either unlatching of main valve plug 23 or dwell period, stream
Amount is all moderate change, is not in impact shock.
In one embodiment of the invention, the principal direction of C hydraulic fluid ports connects main valve plug installation cavity and closed in main valve plug 23
When with V hydraulic fluid ports separate.The one end of main valve plug installation cavity away from V hydraulic fluid ports is provided with the triangular groove that is connected with J passages, thus C hydraulic fluid ports
A part of fluid can enter J passages through the triangular groove.Main valve plug 23 is provided with spring cavity in one end of V hydraulic fluid ports, is arranged on
Main spring 22 in spring cavity forms closing force in main valve plug 23 or opens resistance.
In a preferred embodiment of the invention, another direction connection H passages of C hydraulic fluid ports, H passages connection overflow machine
Structure.The overflow mechanism mainly include relief valve seat 21, overflow valve element 20, steel ball 19, overflow spring base 16, overflow spring 18, overflow
Flow valve pocket 15, the second adjusting set 14 and adjusting nut 13.Slide the overflow valve for being located at and being connected with H passages in one end of overflow valve element 20
The inner chamber of seat 21, the other end pass the inner chamber of relief valve seat 21 by abutting overflow spring base 16 by the steel ball 19 of end.Overflow
Stray bullet spring abutment 16 is socketed with overflow spring 18 backwards to one end of overflow valve element 20, and overflow spring 18 is located in the second adjusting set 14,
The one end of overflow spring 18 abuts overflow spring base 16, and the other end abuts the second adjusting set 14.Second adjusting set 14 is socketed with overflow
Valve pocket 15 and right part are connected with adjusting nut 13.Overflow valve pocket 15 forms thread seal with valve body 1 and is connected.Pass through adjusting nut
13 and second adjusting set 14 can adjust the tensioning degree of overflow spring 18, so as to play the work of regulation overflow mechanism Opening pressure
With.The unlatching of overflow mechanism is also to relax to open stage by stage, and vibration will not be impacted to main frame.
In a preferred embodiment of the invention, it is additionally provided with emergency valve 17 close to overflow mechanism on valve body 1.In Fig. 1
In, the emergency valve 17 is set in parallel in the lower section of overflow mechanism, and is connected by a portion of H passages with C hydraulic fluid ports.It should answer
The effect of anxious valve 17 essentially consists in, when guide's missing handle or engine stop work, can by adjust emergency valve 17 come
Swing arm is put down.
As Fig. 3 shows that the luffing jib maintaining valve of the present invention is used in a kind of embodiment in hydraulic circuit.In this embodiment,
X hydraulic fluid ports connect hydraulic control passage, the passage connection reversal valve of V hydraulic fluid ports, another passage connection overflow valve oil return box, L * channel
Outlet connection fuel tank, the rodless cavity of C hydraulic fluid port connection liquid cylinder pressures.The luffing jib maintaining valve of the present invention at work, it is main include with
Lower four kinds of states：
(1) when swing arm rises, hydraulic oil is flowed into by V hydraulic fluid ports, is applied on main valve plug 23, overcomes the spring force of main spring 22
Enter C hydraulic fluid ports after the top of main valve plug 23 is opened, into the rodless cavity of hydraulic cylinder, promote swing arm to rise.
(2) when swing arm declines, the control oil of hydraulic pilot handle enters X hydraulic fluid ports, is applied on control piston 2 and promotes guide
Valve element 4.When X hydraulic fluid port pressure is increased sufficiently to overcome the setting power of guide's spring 7, pilot valve 4 is opened, C hydraulic fluid ports
(main valve plug is right for triangular groove 25 → passage J → pilot valve 4 circular cones of the hydraulic oil through the right-hand member of main valve plug 23 → passage F → V hydraulic fluid ports
End fluting is triangular groove 25, and flow area gradually increases), boom cylinder produces slow motion, gentle no impact.X hydraulic fluid port pressure
Continue to increase, the opening of pilot valve 4 becomes big, triangular groove → pilot valve 4 of the hydraulic oil through C hydraulic fluid ports → main valve plug 23, pilot valve
Core 4 be open caused by pressure difference increase, main valve plug 23 opens in the presence of C hydraulic fluid ports pressure with passage J pressure difference values, hydraulic oil
V hydraulic fluid ports are flowed into by U-type groove 26 of the C hydraulic fluid ports through main valve plug 23.The openings of sizes of main valve plug 23, it is to be determined by pilot pressure, i.e.,
Pilot pressure determines the openings of sizes of pilot valve 4.The unlatching of pilot valve makes the left and right ends of main valve plug 23 produce pressure difference value,
Cause main valve plug 23 to move right, but after main valve plug 23 moves right, the flow area increase of triangular groove 25, make 23 liang of main valve plug
The pressure difference value at end reduces, and main valve plug 23 reaches new balance.
Because being provided with U-type groove 26 and triangular groove 25 on main valve plug 23, no matter startup stage or dwell period, flow
All it is moderate change, no impact shock.
(3) when swing arm stops, X hydraulic fluid port pressure is laid down, and the first effect of guided missile spring 7 of pilot valve 4 is lower to close, C hydraulic fluid ports
Triangular groove of the pressure oil through main valve plug 23 enters spring cavity, and in the presence of difference in areas, main valve plug 23 is pressed onto on main valve housing 24.
Because main valve plug 23 and main valve housing 24 form linear sealing, thus reliable inclusion seal can be realized.
And because main valve plug 23 and pilot valve 4 are all linear sealings, therefore be the luffing jib maintaining valve No leakage of the present invention,
Swing arm will not decline naturally.
(4) when swing arm overloads, the pressure oil of C hydraulic fluid ports enters overflow valve through the second hole 28, is applied on overflow valve element 20,
Overcome the setting power of overflow spring 18, overflow mechanism (or overflow valve) is opened, now C hydraulic fluid ports hydraulic oil is through main valve plug 23
27 → overflow of hole, 20 → L of the valve element mouths of triangular groove 25 → the first (L mouths are directly connected no back pressure with fuel tank).If C hydraulic fluid port pressure mistakes
Greatly, the opening of overflow valve element 20 is just big, and main valve plug 23 is bigger in pressure difference value caused by C hydraulic fluid ports and spring cavity, and main valve plug 23 is just
Opened under differential pressure action, realize big flow relief function.In a word, the unlatching of overflow valve is also to relax to open stage by stage, will not
Vibration is impacted to main frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.As long as it will additionally be appreciated that in the absence of in structure
Conflict, the feature in each embodiment can be combined with each other, and the combined type feature formed still falls within the scope of the present invention
It is interior.The invention is not limited in specific embodiment disclosed herein, but all skills including falling within the scope of the appended claims
Art scheme.
Claims (10)
1. a kind of luffing jib maintaining valve, it is characterised in that including valve body, pilot mechanism, main valve plug are provided with the valve body and is overflow
Mechanism is flowed, and formed with F passages, J passages, L * channel, H passages and the channel attached X hydraulic fluid ports of hydraulic control and reversal valve in valve body
The V hydraulic fluid ports of connection and the C hydraulic fluid ports being connected with hydraulic cylinder rodless cavity；When V hydraulic fluid port oil-feeds make main valve plug overcome main spring active force to open
Qi Shi, V hydraulic fluid port connect with C hydraulic fluid ports；Conversely, main valve plug is closed in linear sealing, do not connected between V hydraulic fluid ports and C hydraulic fluid ports；When X hydraulic fluid ports
When oil-feed opens pilot mechanism, C hydraulic fluid ports, the triangular groove of main valve plug, J passages, F passages and V hydraulic fluid ports are formed and connected, pilot mechanism
During closing, J passages are blocked with F passages；When overflow mechanism is opened, C hydraulic fluid ports, H passages and L * channel are formed and connected, conversely, H
Passage is blocked with L * channel.
2. luffing jib maintaining valve as claimed in claim 1, it is characterised in that the pilot mechanism installation of the X hydraulic fluid ports connection valve body
Chamber, passage connection main valve plug installation cavity one end of V hydraulic fluid ports, one end of another passage connection F passages of V hydraulic fluid ports, F passages
The other end connection pilot mechanism installation cavity, J passages one end connection pilot mechanism installation cavity simultaneously with F passages pilot mechanism close
It is blocked when closing, the other end of J passages is connected to main valve plug installation cavity.
3. luffing jib maintaining valve as claimed in claim 2, it is characterised in that the pilot mechanism installation cavity is provided with pilot valve
Seat, the pilot mechanism include control piston, pilot valve, guide's spring and guide's spring base, and guide's valve seat is from close to X
One end of hydraulic fluid port starts to be sequentially provided with shoulder hole and the channel attached a chambers of F and the channel attached b chambers of J and guide's spring cavity, institute
State the big intracavitary for controlling piston in the shoulder hole that valve body is formed with guide's valve seat end and can slidably reciprocate, the pilot valve
One end be connected on control piston, the other end sequentially passes through a chambers, b chambers, the cushion block that is located at b intracavitary and abuts to and be located at first guided missile
On guide's spring base of spring chamber, guide's spring base is connected with guide's spring, the first guided missile backwards to the one side of pilot valve
Spring one end abuts guide's spring base, and the other end is connected in the cavity wall of guide's spring cavity.
4. luffing jib maintaining valve as claimed in claim 3, it is characterised in that the pilot valve, which is located on the part of b intracavitary, to be set
The circular cone of protrusion is equipped with, the pilot valve, which is opened, refers to that the circular cone moves in b intracavitary to the direction away from a chambers, makes
A chambers are obtained to connect with b chambers；The pilot valve, which is closed, refers to that circular cone blocks b chambers close to the passway of the side of a chambers, separates a
Chamber and b chambers.
5. the luffing jib maintaining valve as described in claim 3 or 4, it is characterised in that guide's spring cavity is by guide's valve seat and elder generation
Guide valve bushing is connected to be formed, and guide's valve seat, which is fixed, to be located in the pilot mechanism installation cavity of valve body formation, and guide's valve pocket is remote
It is tightly connected from X hydraulic fluid ports and with valve body screw thread, the other end of guide's spring is connected to pilot valve and put.
6. luffing jib maintaining valve as claimed in claim 5, it is characterised in that the pilot valve, which is put, is also associated with governor motion,
The governor motion by the regulation to guide's tensioned degree so as to play regulation pilot valve Opening pressure size work
With.
7. luffing jib maintaining valve as claimed in claim 6, it is characterised in that the direction connection main valve plug peace of the C hydraulic fluid ports
It behave affectedly and separates when main valve plug is closed with V hydraulic fluid ports, the one end of main valve plug installation cavity away from V hydraulic fluid ports is provided with what is connected with J passages
Triangular groove, main valve plug are provided with spring cavity in one end of V hydraulic fluid ports, and the main spring in the spring cavity makes main valve plug
Produce the active force for closing main valve plug.
8. luffing jib maintaining valve as claimed in claim 7, it is characterised in that another direction connection H passages of the C hydraulic fluid ports,
The H passages connect overflow mechanism, and the overflow mechanism includes relief valve seat, overflow valve element, steel ball, overflow spring base, overflow
Spring, overflow valve pocket, adjusting set and adjusting nut, the inner chamber of the relief valve seat are sliding combined with overflow valve element, the overflow
The inner chamber for being located at the relief valve seat connected with H passages is slided in one end of valve element, and the other end passes the inner chamber of relief valve seat by setting
Steel ball in its end abuts overflow spring base, and the overflow spring base is socketed with overflow spring backwards to one end of overflow valve element,
The overflow spring is located in adjusting set, and one end abuts overflow spring base, and the other end abuts adjusting set, is socketed outside the adjusting set
There is overflow valve pocket and end is connected with adjusting nut, the overflow valve pocket is tightly connected with valve body screw thread.
9. the luffing jib maintaining valve as described in claim 1 or 8, it is characterised in that also set up on the valve body close to overflow mechanism
There is emergency valve, a portion of the emergent valve passage through H passages is connected with C hydraulic fluid ports.
10. such as the luffing jib maintaining valve any one of claim 1,2,3,4,6,7,8, it is characterised in that the main valve plug
Including being sequentially connected stepped head, middle part and end, the front end on the head is that round table-like, head afterbody is cylinder
Shape and throttling channel is provided with the head；The head is connected with the middle part by First Transition structure, the middle part with
The end is connected by the second transition structure, on second transition structure and the end formed with section from big to small
Triangular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610559958.3A CN106151143B (en) | 2016-06-29 | 2016-06-29 | Luffing jib maintaining valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610559958.3A CN106151143B (en) | 2016-06-29 | 2016-06-29 | Luffing jib maintaining valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106151143A CN106151143A (en) | 2016-11-23 |
| CN106151143B true CN106151143B (en) | 2017-12-08 |
Family
ID=58060426
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610559958.3A Expired - Fee Related CN106151143B (en) | 2016-06-29 | 2016-06-29 | Luffing jib maintaining valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN106151143B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107654428B (en) * | 2017-08-28 | 2024-07-02 | 宁波长壁流体动力科技有限公司 | Valve structure |
| CN110145508B (en) * | 2019-05-22 | 2024-03-22 | 新乡市德恩智能工业有限公司 | Multi-way valve with holding valve |
| CN113124012B (en) * | 2021-04-06 | 2022-05-27 | 中联重科股份有限公司 | Load holding valve and construction machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998006949A1 (en) * | 1996-08-08 | 1998-02-19 | Hitachi Construction Machinery Co., Ltd. | Hydraulic control apparatus |
| CN101294402B (en) * | 2008-05-28 | 2010-12-08 | 江阴市长龄液压机具厂 | Luffing jib maintaining valve for hydraulic shovel |
| CN101338829B (en) * | 2008-08-12 | 2010-06-09 | 临海多伊尔机械有限公司 | Multipath hydraulic change-over valve |
| CN201396329Y (en) * | 2009-05-12 | 2010-02-03 | 上海立新液压有限公司 | Hydraulic balance valve |
| DE102011008709B4 (en) * | 2011-01-17 | 2021-11-04 | Linde Hydraulics Gmbh & Co. Kg | Control valve device for actuating a double-acting stick cylinder of a mobile work machine |
| CN204371812U (en) * | 2014-12-15 | 2015-06-03 | 山东华伟液压设备制造有限公司 | A kind of load holding valve |
| CN205117859U (en) * | 2015-10-23 | 2016-03-30 | 上海立新液压有限公司 | Load maintaining valve |
| CN105526199B (en) * | 2016-02-03 | 2018-04-20 | 徐州徐工挖掘机械有限公司 | Excavator cab hydraulic system for lifting |
-
2016
- 2016-06-29 CN CN201610559958.3A patent/CN106151143B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN106151143A (en) | 2016-11-23 |
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Effective date of registration: 20181205 Address after: 224400 National Pioneer Park No. 10, Goudun Town, Funing County, Yancheng City, Jiangsu Province Patentee after: JIANGSU YANGAO VALVE MANUFACTURING CO.,LTD. Address before: 315000 Unit 013, Room 18-1, 035, 555 Juxian Road, Ningbo High-tech Zone, Zhejiang Province Patentee before: NINGBO WENZE ELECTROMECHANICAL TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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Address after: Room 302, Nanjing International Service Outsourcing building, 301 Hanzhongmen street, Gulou District, Nanjing City, Jiangsu Province Patentee after: JIANGSU YANGAO VALVE MANUFACTURING Co.,Ltd. Address before: 224400 National Pioneer Park No. 10, Goudun Town, Funing County, Yancheng City, Jiangsu Province Patentee before: JIANGSU YANGAO VALVE MANUFACTURING Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |
Address after: 224400 National Pioneer Park No. 10, Goudun Town, Funing County, Yancheng City, Jiangsu Province Patentee after: JIANGSU YANGAO VALVE MANUFACTURING Co.,Ltd. Address before: Room 302, Nanjing International Service Outsourcing building, 301 Hanzhongmen street, Gulou District, Nanjing City, Jiangsu Province Patentee before: JIANGSU YANGAO VALVE MANUFACTURING Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171208 |
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