CN1133821C - Balancing valve - Google Patents

Balancing valve Download PDF

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Publication number
CN1133821C
CN1133821C CNB011392738A CN01139273A CN1133821C CN 1133821 C CN1133821 C CN 1133821C CN B011392738 A CNB011392738 A CN B011392738A CN 01139273 A CN01139273 A CN 01139273A CN 1133821 C CN1133821 C CN 1133821C
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CN
China
Prior art keywords
valve
main
plug
fluid port
hydraulic fluid
Prior art date
Application number
CNB011392738A
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Chinese (zh)
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CN1356481A (en
Inventor
刘富良
卢永松
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卢永松
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Priority to CNB011392738A priority Critical patent/CN1133821C/en
Publication of CN1356481A publication Critical patent/CN1356481A/en
Application granted granted Critical
Publication of CN1133821C publication Critical patent/CN1133821C/en

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Abstract

The present invention relates to a balance valve which is suitable for an open type lifting return circuit in engineering machinery of 8 ton to 50 ton lifting weight. The present invention comprises a main valve, a pilot valve, wherein the main valve comprises a valve body and a main valve core, and the valve body is a cylindrical barrel body. The pilot valve is positioned in the main valve core, and the guide valve core is connected with the main valve core through a spring. A main valve spring is composed of a plurality of springs of different rigidity, which are levorotatory and dextrogyrate and are mutually sleeved. Compared with the prior art, the present invention has the advantages that because the valve body adopts a cylindrical barrel body structure, the valve body can be directly inserted in the head of a hydraulic cylinder. Because the main valve spring adoptsa plurality of spring structures of different rigidity, which are matched with a groove on the lateral face of a main valve core cone, the control is accurate, sensitive and reliable. When a soft tube is broken and losses pressure, the guide valve core of the main valve core automatically and quickly closes an oil path between main oil ports B and A. Thus, stalled descent of loading is prevented, and the guide valve core plays a function of a hydraulic lock.

Description

A kind of equilibrium valve

Technical field

The present invention relates to a kind of valve, especially refer to a kind of hydraulically balanced valve in flexible and the luffing cylinder circuit in 8 tons to the 50 tons engineering machinery that play liter weights that is applicable to.

Background technique

Engineering machinery in the modern times, in the machinery such as building machinery, widely applied the hydraulic pressure load bearing system, wherein equilibrium valve is the crucial hydraulic element of this type systematic, the quality of its performance directly affects machine performance, and existing hydraulically balanced valve mainly is made of control valve and main valve, common have two kinds of single-stage and leading types, single-stage main valve and control valve are for to connect side by side, the leading type main valve is nested the connection with control valve, the hydraulically balanced valve of above-mentioned two kinds of forms forms owing to adopting outer closed assembly to join, complex structure, volume is bigger, be not easy to be directly installed on the filler opening place of oil cylinder, if adopt oil pipe to connect, make and to allow system more complicated, and the easy leakage of oil of pipe and breaking, influenced the functional reliability of equilibrium valve, for this reason, a kind of new equilibrium valve is devised, as application number is 87202245U " cartridge balanced valve ", this scheme adopts main valve plug to be inserted in the valve support chamber, guide's spool is inserted in the simple chamber of main valve plug, because adopt simple plug-in mounting mode structure, thereby compact structure, volume is little in light weight, can be directly installed on the filler opening place of oil cylinder or motor, but this equilibrium valve still is positioned at the outside of oil cylinder or motor, must make the whole system volume bigger, moreover, this equilibrium valve adopts the hydraulic coupling feedback principle, though improved working stability to a certain extent, sensitivity descends, and insufficient sensitivity also can influence its proper functioning; Also have its control spool work to control according to a control mouthful oil-feed, a mouthful inlet is provided with damping in control, have one-way valve in the damping, bring unsafe factor for like this braking and locking function of valve body, when control valve is positioned at the neutral position, because the closure of pilot valve is subjected to the control of its spring and control spool, if the one-way valve in the damping is closed at once, certain hydraulic oil is locked in the control spool chamber, make the control valve closure that can not normally reset, also certainly will influence the pilot valve closure, make the hydraulic oil of filler opening enter oil outlet, make the braking and locking functional failure of valve body by pilot valve.Control the direct control orifice aperture of spool size in addition, because the spring rate that matches is certain, when the operation sudden change, because sensitivity is not high, its dynamic and static state property is still undesirable.

Summary of the invention

Technical problem to be solved by this invention is to overcome above-mentioned defective, provides that a kind of more reasonable structure, sensitivity are moderate, good reliability, can directly insert the equilibrium valve in the oil hydraulic cylinder.

The present invention solves the problems of the technologies described above the technological scheme that is adopted: equilibrium valve comprises main valve, pilot valve, wherein main valve comprises valve pocket, the main valve plug that is cylindrical shell, on the outer side surface of valve body, be provided with the first main hydraulic fluid port and the second main hydraulic fluid port, described pilot valve is positioned at main valve plug, guide's spool is connected with spring, above-mentioned each valve all comprises two chambeies that are positioned at the spool front and back, it is characterized in that: a plurality of springs that (1) main spool spring is respectively left-handed and dextrorotation, mutually nested and rigidity differs are formed, and main valve plug links to each other with valve pocket by a plurality of springs; (2) in an end face of valve pocket, be provided with control valve plug, this control valve plug and main valve plug offset and can move vertically in valve pocket, damping hole b2 and the back cavity of hydraulic fluid port c1 connection pilot valve and the ante-chamber of main valve of mutual perforation axially and radially located to be provided with respectively in the control valve plug middle part, and control valve plug end and pilot valve spring offset; (3) described main valve plug upper forepart radially, radially be respectively equipped with the back cavity and the second main hydraulic fluid port that hydraulic fluid port a1 and b4 are communicated with pilot valve on guide's spool; (4) on main valve plug, be parallel to and be axially arranged with the back cavity and the second main hydraulic fluid port that damping hole b5 is communicated with main valve plug; (5) rear portion radially is provided with the ante-chamber and the first main hydraulic fluid port that a hydraulic fluid port a6 is communicated with pilot valve on described main valve plug.

Can be provided with a plurality of boss on the tube inwall of described valve pocket; The outer middle side part of main valve plug is a plurality of coniform, and circular cone side and above-mentioned boss match;

The outside, described main valve plug middle part wherein can be provided with a plurality of skewed slots on the circular cone side;

Be provided with the damping plug that fixes with it in the end face that described control valve plug and main valve plug offset, the spring of this damping plug and pilot valve offsets and is axially arranged with above-mentioned damping hole b2 within it;

The outer ring of described valve pocket is provided with a plurality of grooves around the circumference side;

Also be provided with the control cylinder between control valve plug and valve pocket in the described valve body end face that is provided with control valve plug.

Compared with prior art, the invention has the advantages that: because valve pocket adopts tube structure, so can directly insert the oil hydraulic cylinder head, again because a plurality of spring structures that main spool spring adopts rigidity to differ, mix the skewed slot on the main valve plug circular cone side, feasible control is more accurate, sensitive, reliably, also have under the situation of the damaged decompression of flexible pipe, guide's spool in the main valve plug can be closed the oil circuit between the second main hydraulic fluid port and the first main hydraulic fluid port automatically rapidly, can prevent that load stall from descending, play the effect of a hydraulic lock, lock function is also more safe and effective when braking in addition, avoids some unsafe factors.

Description of drawings

Fig. 1 is that embodiment of the invention structure is cutd open and shown schematic representation;

Fig. 2 is the main valve plug structural representation;

Fig. 3 is the hydraulic schematic diagram of present embodiment;

Fig. 4 is that the present invention is applied in the hydraulic schematic diagram on the winch.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Referring to Fig. 1, equilibrium valve comprises main valve and pilot valve, above-mentioned each valve all comprises two chambeies that are positioned at the spool front and back, wherein main valve comprises valve pocket 7 and main valve plug 6, described valve pocket 7 is cylindrical tube, on the outer side surface of valve pocket 7, be provided with two the first main hydraulic fluid port A and the second main hydraulic fluid port B, the outer ring of valve pocket 7 is provided with three grooves 11 around the circumference side, in order to inlay seal ring, seal after making equilibrium valve insert oil hydraulic cylinder, the tube inwall of valve pocket 7 is provided with two boss 12 and 12,13 of 13, two boss form an oil pocket a4; The outer middle side part profile of main valve plug 6 is two circular cone side a2 and a5 separated by a distance, two circular cone side a2 and a5 respectively with valve pocket 7 inwalls on two boss 13,12 match, wherein a circular cone side a2 is provided with upper and lower totally two skewed slots 15, referring to Fig. 2, make main valve plug 6 when valve pocket 7 moves, the main valve plug 6 at this place and 13 of valve pocket 7 boss become a settable orifice, and another circular cone side a5 forms line with valve pocket boss 12 and contacts, to guarantee intact sealing;

In valve pocket 7, front end at main valve plug 6 has a control valve plug 1 mutually with it, this control valve plug 1 is "  " shape cylinder, concentric and be positioned on control valve plug 1 shoulder control cylinder 2 is arranged with control valve plug 1, this control cylinder 2 is threaded with valve pocket 7, in control cylinder 2, be provided with 4 circular holes 14 of concentric distribution, the gripping when assembling in order to equilibrium valve; Control valve plug 1 is tightly connected with control cylinder 2, and can in control cylinder 2, move vertically, be fixed with a damping plug 3 with screw thread on the face that control valve plug 1 and main valve plug 6 offset, be axially arranged with damping hole b2 in this damping plug 3, control valve plug 1 middle part is radially located to be provided with the hydraulic fluid port c1 that connects with damping hole b2 and is communicated with the back cavity b3 of pilot valve and the ante-chamber b1 of main valve, a main spool spring that offsets with the rear end of main valve plug 6, this main spool spring is respectively by left-handed and dextrorotation, mutually nested and dual spring 8 and 10 that rigidity differs is formed, one end of dual spring is positioned on the main valve plug 6, the other end and spring seat 9 offset, spring seat 9 respectively with valve pocket 7, main valve plug 6 is tightly connected;

In the inner chamber of main valve plug 6, be inserted with guide's spool 5, this guide's spool 5 links to each other with control valve plug 1 by pilot valve spring 4, described main valve plug 6 upper foreparts radially, radially be respectively equipped with the back cavity b3 and the second main hydraulic fluid port B that hydraulic fluid port a1 and b4 are communicated with pilot valve on guide's spool, on main valve plug 6, be parallel to and be axially arranged with the back cavity b6 and the second main hydraulic fluid port B that damping hole b5 is communicated with main valve, the rear portion radially is provided with the ante-chamber a3 and the first main hydraulic fluid port A that a hydraulic fluid port a6 is communicated with pilot valve on described main valve plug 6.

The foregoing description is owing to adopt cylindrical tube, all elements are installed on the same axis, then can directly insert the head of oil hydraulic cylinder, but also can outside the foregoing description, be with valve body 16, see Fig. 3, then can be installed in the oil hydraulic cylinder outside to this equilibrium valve, link to each other with oil hydraulic cylinder, to satisfy the needs of different occasions by pipeline.

Fig. 4 is that the present invention is applied in the hydraulic schematic diagram on the winch, and the first main hydraulic fluid port A on this valve pocket 7 links to each other with the hydraulic fluid port A1 of 3-position 4-way control valve H, the second main hydraulic fluid port B and oil hydraulic cylinder G rodless cavity B 1Mouthful link to each other, the hydraulic fluid port B3 of 3-position 4-way control valve H respectively with the rod chamber B of oil hydraulic cylinder G 2, control valve plug 1 outside control mouth Pp link to each other, other two hydraulic fluid port P and the O of control valve H connect pressure oil-source and oil sump tank respectively.

The work control procedure of this valve is as follows: (1) normally hoists load: H gets to the left side the 3-position 4-way control valve, pressure oil-source communicates with the hydraulic fluid port A1 of control valve H, pressure oil enters the first main hydraulic fluid port A on this valve pocket 7, hydraulic fluid port a6 radially on main valve plug 6, the ante-chamber a3 of pilot valve, overcome the pretightening force of pilot valve spring 4, guide's spool is moved to left, pressure oil is again through the space of sealing cone a7 and main valve plug 6, hydraulic fluid port a1 in the main valve plug 6, the second main hydraulic fluid port B on the valve pocket 7 enters the rodless cavity B1 of oil hydraulic cylinder, promoting load W rises, the oil return of the rod chamber B2 of oil hydraulic cylinder G is through pilot line B2-B3, the hydraulic fluid port B3 of control valve H gets back to oil sump tank, fluid among this valve second main hydraulic fluid port B flow to the back cavity b6 of main valve by damping hole b5 simultaneously, by the hydraulic fluid port b4 on guide's spool 5, the back cavity b3 of pilot valve, damping hole b2, hydraulic fluid port c1 flow to the ante-chamber b1 of main valve, pressure and main valve dual spring 8 in main valve ante-chamber b1 and the generation of back cavity b6 area difference, 10 effects down, the conical surface a5 of main valve plug 6 is close to the boss 12 on the valve pocket 7, cut off the path of the main hydraulic fluid port A of the second main hydraulic fluid port B to the first, fluid among the second main hydraulic fluid port B can not flowed backward on the first main hydraulic fluid port A, and this moment, equilibrium valve only played the effect of an one-way valve.(2) load W speed limit is transferred: 3-position 4-way control valve H is got to the right, this moment, pressure oil-source linked to each other with hydraulic fluid port B3 among the control valve H, and oil sump tank links to each other with hydraulic fluid port A1, pressure oil enters the rod chamber B2 of oil hydraulic cylinder through pilot line B2-B3, pressure among the pilot line B2-B3 acts on control valve plug 1 by the outside control mouth Pp of control valve plug 1, when oil pressure hour, control valve plug 1 overcomes the pretightening force of the less spring 10 of the rigidity of main valve, when if oil pressure is big, control valve plug 1 overcomes the dual spring 8 of main valve, 10 pretightening force, main valve plug 6 is moved to right, open the sealing of 12 of conical surface a5 and valve pocket boss, make the second main hydraulic fluid port B of fluid on valve pocket 7 among the oil hydraulic cylinder rodless cavity B1, restriction a2, oil pocket a4, the space that conical surface a5 and valve pocket boss are 12 flow to the first main hydraulic fluid port A of this valve, and the hydraulic fluid port A1 in control valve H flows back to oil sump tank again; And the fluid among the while second main hydraulic fluid port B flow to the back cavity a3 of pilot valve through hydraulic fluid port a1 on the main valve plug 6 and the hydraulic fluid port b4 on guide's spool 5, under the effect of the restoring force of this pressure oil and pilot valve spring 4, guide's spool 5 is moved to right, sealing cone a7 is close to main valve plug 6, has cut off the path of the main hydraulic fluid port B of the first main hydraulic fluid port A to the second.If the control mouth pressure raises suddenly, because the drag effect at the restriction place on the conical surface a2, the speed that load is descended is not undergone mutation, main valve plug 6 moves to right simultaneously, because main valve plug 6 outer side surface places are provided with two skewed slots 15, it is big that the oilhole cross section of skewed slot 15 and 13 formation of valve pocket boss also becomes thereupon, thereby slowly improve rate of descent, improved dynamic stability.(3) load is still in midair: in the middle of 3-position 4-way control valve H is got to, the path of cut-out pressure source and control valve H hydraulic fluid port A1, guide's spool 5 is under the pressure effect of pilot valve spring 4 and load generation, and sealing cone a7 is close to main valve plug 6; And main valve plug 6 is under the pressure effect of main valve plug dual spring 8,10 and main valve ante-chamber b1 and the generation of back cavity b6 area difference, sealing cone a5 is close to valve pocket boss 12, cut off the path between the inner first main hydraulic fluid port A of this valve and the second main hydraulic fluid port B fully, oil hydraulic cylinder G rodless cavity internal pressure oil can not flow backward to control valve H oil sump tank through this valve, stops load to descend voluntarily.(4) the damaged Braking mode protection of flexible pipe: be connected with high pressure hose usually between control valve H and this valve first main hydraulic fluid port A; when negative moment is transferred load; high pressure hose does not bear high pressure; but when normally promoting load; high pressure hose will bear and overcome the high pressure that load produces; when frequently bearing high pressure and long-term work ageing of rubber and cause that high pressure hose is damaged; this valve first main hydraulic fluid port A instantaneous loss of pressure; under the pressure effect of pilot valve spring 4 and load generation; the sealing cone a7 of pilot valve closes rapidly; cut off the path between the first main hydraulic fluid port A and the second main hydraulic fluid port B, stop load to be fallen voluntarily.

Protection scope of the present invention is not subjected to the restriction of the structure of the foregoing description; even the structure to embodiment is done some change; be designed to four nested in twos springs as dual spring; change 3 or 4 etc. into as the skewed slot 15 on the main valve plug circular cone side a2, such scheme still belongs to protection scope of the present invention.

Claims (6)

1. equilibrium valve, comprise main valve, pilot valve, wherein main valve comprises valve pocket (7), the main valve plug (6) that is cylindrical shell, the outer side surface of described valve pocket (7) is provided with the first main hydraulic fluid port (A) and the second main hydraulic fluid port (B), described pilot valve is positioned at main valve plug (6), guide's spool (5) is connected with pilot valve spring (4), and above-mentioned each valve all comprises two chambeies that are positioned at the spool front and back, it is characterized in that:
(1) a plurality of springs that main spool spring is respectively left-handed and dextrorotation, mutually nested and rigidity differs are formed, and main valve plug (6) links to each other with valve pocket (7) by a plurality of springs;
(2) be provided with control valve plug (1) in the end face of described valve pocket (7), this control valve plug (1) offsets with main valve plug (6) and can move vertically in valve pocket (7), damping hole (b2) and hydraulic fluid port (c1) that mutual perforation axially and is radially located to be provided with respectively in control valve plug (1) middle part are communicated with the back cavity (b3) of pilot valve and the ante-chamber (b1) of main valve, and control valve plug (1) end and pilot valve spring (4) offset;
(3) described main valve plug (6) upper forepart radially, radially be respectively equipped with hydraulic fluid port (a1) on guide's spool (5) and (b4) be communicated with the back cavity (b3) and the second main hydraulic fluid port (B) of pilot valve;
(4) go up, be parallel to the back cavity (b6) and the second main hydraulic fluid port (B) that are axially arranged with damping hole (b5) connection main valve at main valve plug (6);
(5) go up the rear portion at described main valve plug (6) and radially be provided with the ante-chamber (a3) and the first main hydraulic fluid port (A) that a hydraulic fluid port (a6) is communicated with pilot valve.
2. equilibrium valve according to claim 1 is characterized in that described valve pocket (7) tube inwall is provided with a plurality of boss, and the outer middle side part of main valve plug (6) is a plurality of coniform sides, and circular cone side on the main valve plug (6) and above-mentioned valve pocket (7) boss match.
3. equilibrium valve according to claim 2 is characterized in that the outside, described main valve plug (6) middle part wherein is provided with a plurality of skewed slots (15) in a circular cone side.
4. equilibrium valve according to claim 1, it is characterized in that being provided with the damping plug (3) that fixes with control valve plug (1) in the end face that described control valve plug (1) and main valve plug (6) offset, this damping plug (3) offsets with pilot valve spring (4) and be axially arranged with above-mentioned damping hole (b2) in damping plug (3).
5. equilibrium valve according to claim 1 is characterized in that the outer ring of described valve pocket (7) is provided with a plurality of grooves (11) around the circumference side.
6. equilibrium valve according to claim 1 is characterized in that also being provided with the control cylinder (2) that is positioned between control valve plug (1) and valve pocket (7) in described valve pocket (7) end face that is provided with control valve plug (1).
CNB011392738A 2001-12-27 2001-12-27 Balancing valve CN1133821C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB011392738A CN1133821C (en) 2001-12-27 2001-12-27 Balancing valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB011392738A CN1133821C (en) 2001-12-27 2001-12-27 Balancing valve

Publications (2)

Publication Number Publication Date
CN1356481A CN1356481A (en) 2002-07-03
CN1133821C true CN1133821C (en) 2004-01-07

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ID=4675195

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB011392738A CN1133821C (en) 2001-12-27 2001-12-27 Balancing valve

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CN (1) CN1133821C (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101504018B (en) * 2009-03-13 2013-10-02 湖州生力液压有限公司 Lifting and steering hydraulic integrated valve with manual convenience
CN101769273B (en) * 2009-12-22 2012-03-07 浙江大学 Pressure tracking valve
CN102072215B (en) * 2011-02-02 2012-11-28 卢宇 Balance valve with quickly-closing valve plug
CN102213245B (en) * 2011-07-15 2013-10-30 朱国胜 Threaded cartridge electrical control bidirectional pressure compensation flow valve
CN102661299A (en) * 2012-05-14 2012-09-12 三一汽车起重机械有限公司 Self-weight amplitude-falling constant-power control valve and crane
CN103062147B (en) * 2013-01-24 2015-06-03 中联重科股份有限公司 Hydraulic-control throttling valve, balance valve, engineering machine and hydraulic system for controlling winch
CN103267039A (en) * 2013-05-24 2013-08-28 平原机器厂(新乡) Spring installation seat for pilot valve and manual pilot valve using installation seat
CN103256270A (en) * 2013-05-24 2013-08-21 平原机器厂(新乡) Pedal pilot valve
CN103256268A (en) * 2013-05-24 2013-08-21 平原机器厂(新乡) Pedal pilot control valve
CN103256269A (en) * 2013-05-24 2013-08-21 平原机器厂(新乡) Manual pilot valve and spool thereof
WO2015029866A1 (en) * 2013-09-02 2015-03-05 Smc株式会社 Fluid control valve
CN103899596B (en) * 2014-03-31 2016-11-02 雷永志 A kind of hydraulic lock of band guide's check valve
CN105201942B (en) * 2014-10-24 2019-02-22 徐州重型机械有限公司 Balanced valve and autocrane
CN106545537B (en) * 2015-09-22 2018-08-10 江苏汉力士液压制造有限公司 A kind of stroking mechanism of hydraulic servo variable pump
CN105135019B (en) * 2015-10-13 2018-03-16 徐州重型机械有限公司 Balanced valve and engineering machinery
CN105971965B (en) * 2016-07-19 2017-12-19 江苏源达机械科技有限公司 Flow type balanced valve
CN106050780B (en) * 2016-07-19 2017-10-31 黄培泉 A kind of flow type balanced valve

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