CN1350126A - Rotary buffering valve - Google Patents
Rotary buffering valve Download PDFInfo
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- CN1350126A CN1350126A CN 01142605 CN01142605A CN1350126A CN 1350126 A CN1350126 A CN 1350126A CN 01142605 CN01142605 CN 01142605 CN 01142605 A CN01142605 A CN 01142605A CN 1350126 A CN1350126 A CN 1350126A
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Abstract
The present invention relates to the turning buffer valve technology in crane, which is characterized by that in the main valve body through the installation of cavity, built-in channel and necessary parts, the buffer valve, electromagnetic valve, adjustable backpressure valve, control valve and non-way valve are detachly combined in the main valve body to make it possess several functions of turning buffer valve in crane. Said invention possesses the advantages of reasonable compact structure, small volume and safe and convenient use, etc.
Description
Technical field
The present invention relates to a kind of rotary buffering valve, relate in particular to the technical field that is used for revolution buffering control valve on 20 tons to the 60 tons hydraulic mobile crane swirl gears.
Background technique
Traditional truck crane swirl gear generally will have following characteristics according to actual usage requirement, can start fast, can stop fast again; Want and acceleration and deceleration to reduce goods pendulum and jib shake automatically, cut down dynamic impulsion pressure and guarantee goods; Want to make cable wire to keep plumbous heavy and jib precise synchronization revolution or the like, make lifting function safety, rapidly, lifting cargo easily.And now on the hoist in order to realize above-mentioned control procedure, the unit that is still the employing standard more can hydraulic element, couple together realization with complicated pipe arrangement, so its common structure is huger, terse compactness inadequately, the hydraulic element in east, the hydraulic element in west are so connect the also corresponding more complicated of their pipeline, leakage of oil easily again, also inconvenient its installed and used, volume is also huger, accounts for than large space, so the rate of fault height, potential safety hazard is many, and working life is not long yet.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of integrated required multiple function of crane rotation operating mode and compact structure, no pipe design, little, the easy production and assembly of volume and the rotary buffering valve installed and used at prior art.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: this kind rotary buffering valve, it includes valve body, it is characterized in that on the valve body of main valve body, having oil inlet P with oil outlet O and the hydraulic fluid port A and the B that remove to be connected the outside oil hydraulic motor, form installation cavity that each valve is installed and the inner flow passage that they are communicated with in the main valve body, there is trimmer valve to be connected in the main valve body and connects respectively between the inner flow passage of hydraulic fluid port A and connection hydraulic fluid port B, the trimmer valve bypass is connected to selector valve, the left chamber of trimmer valve by inner flow passage and damping respectively with the solenoid valve import, the right chamber of trimmer valve, the pilot valve import connects, the outlet of solenoid valve removes to connect adjustable back pressure valve, the pilot valve outlet connects pressure relief opening, the control valve that three six logical types are arranged in main valve body in addition, be mounted with respectively about in this control valve pipeline connection and the reverse one-way valve that is communicated with, the control valve oil outlet connects the two ends of trimmer valve respectively by inner flow passage, the oil inlet P of main valve body and oil outlet O connect the filler opening and the return opening of control valve respectively by inner flow passage and one-way valve, the middle Lu Yiduan of control valve is connected with filler opening, the other end is divided into two-way, the one-way valve of leading up to is connected with the two ends of trimmer valve, and another road is connected with return opening.
Above-mentioned main valve body has the installation cavity between the inner flow passage that is communicated with hydraulic fluid port A and hydraulic fluid port B, built-in trimmer valve spool, the left end cross section of this trimmer valve spool is big, the right-hand member cross section is little, the between position has the steel ball through hole, and be equipped with the selector valve that steel ball constitutes bypass, have the duct in the middle of the left end spool of trimmer valve simultaneously, one end and steel ball through hole join, the other end is communicated with the left chamber of trimmer valve, spring eye is opened in right-hand member spool end, is supported with the buffering valve core spring between spring eye and the right chamber spring seat, on the surface of contact Sealing is arranged between trimmer valve spool and the installation cavity.
Above-mentioned main valve body is at the removable pilot valve that is fixed with in installation cavity end of buffering spool, it has through hole in the spring seat of trimmer valve, it is that tapered pilot valve core withstands on this through hole that head is arranged simultaneously, be supported with guide's valve core spring between its rear end and the valve seat, pilot valve is installed cavity has inner flow passage to be communicated with the pressure relief opening of main valve body.
The removable Motionless electromagnetic valve of above-mentioned main valve body.
Above-mentioned main valve body is communicated with the installation cavity of adjustable back pressure valve in the outlet of solenoid valve, this installation cavity end is removable to be fixed with adjustable back pressure valve, its structure is fixing separator in stair-stepping cavity, separator has through hole, the spool end of adjustable back pressure valve withstands on the separator simultaneously, be supported with adjustable back pressure valve spring between the adjusting element on afterbody and the adjustable back pressure valve, adjusting element is to be threaded with adjustable back pressure valve valve seat.
Above-mentioned main valve body is the removable preventing control valve core that is fixed with in position between the inner flow passage of the inner flow passage of oil inlet P, oil outlet O and hydraulic fluid port A, hydraulic fluid port B, its structure is out to connect the installation cavity of main valve body, built-in preventing control valve core, the built-in one-way valve of preventing control valve core left and right symmetrically, one-way valve is at the built-in steel ball of preventing control valve core tapping, steel ball and be fixed between the fixed block of preventing control valve core end and be supported with spring, main valve body is fixed with the sealing upper shield in the end that cavity is installed, and wherein is supported with the control valve spring between a upper shield and the main valve plug.
Compared with prior art, the invention has the advantages that: 1, multifunctional characteristics, its integrated required numerous function of revolution operating mode, can start fast, stop fast, acceleration and deceleration reduce goods pendulum and jib shake automatically, cut down dynamic impulsion pressure, guarantee that goods, cable wire keep effects such as plumbous heavy and the revolution of jib precise synchronization; 2, compact structure, volume little, do not have the external pipeline design, be not easy leakage of oil, conveniently install and use; 3, reasonable in design, a lot of valves are removable being fixed on the main valve body, assembling during both convenient production makes things convenient for again and uses maintenance adjustment; 4, have buffering and repairing function, guaranteed that oil hydraulic motor can not cause damage because of the negative moment suction is empty, it can manually be controlled, but hydraulic control again, and rate of fault is little, safe handling property is better.
Description of drawings
Fig. 1 is the hydraulic work schematic diagram (manually control) of this valve;
Fig. 2 is the hydraulic work schematic diagram (hydraulic control) of this valve;
Fig. 3 is this valve right elevation;
Fig. 4 is that the A-A of this valve is to view;
Fig. 5 is that the C-C of this valve is to sectional view;
Fig. 6 is that the B-B of this valve is to sectional view (manually control);
Fig. 7 is that the E-E of this valve is to sectional view;
Fig. 8 is this valve left side pseudosection;
Fig. 9 is this valve back side sectional view.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail.
Anticipate as shown in the figure, this kind rotary buffering valve, its critical piece has main valve body 1, damping 2, oil duct 3, electromagnetic valve core filler opening 4, damping 5, buffering valve core spring 6, guide's spool 7, guide's valve core spring 8, inner flow passage 9, selector valve steel ball 10, buffering spool 11, inner flow passage 12, electromagnetic valve core spring 13, electromagnetic valve core 14, adjustable back pressure spool 15, adjustable back pressure valve core spring 16, electromagnet 17, built-in nonreturn valve core spring 18, built-in one-way valve steel ball 19, oil return repairing nonreturn valve core 20, return oil pressure valve core spring 21, return oil pressure spool 22, inner flow passage 23, commutation valve rod 24, repairing nonreturn valve core 25, selector valve 26, trimmer valve 27, pilot valve 28, control valve 29, solenoid valve 30, adjustable back pressure valve 31.
All elements of this valve all are built in the main valve body, commutation valve rod each oil pocket and oil inlet and outlet and other element oil pockets, hydraulic fluid port all adopt to be cast runner and is connected in the main valve body, be symmetrically installed with built-in one-way valve in the endoporus of the commutation valve rod left and right sides, be encapsulated in the selector valve steel ball in the buffering spool, buffering spool two ends sectional area does not wait.
Have hydraulic fluid port A, B, A1, B1 in this valve front, drain tap L; The back side has oil inlet P and oil outlet O.Establish newly respectively into and out of control port X1, X2 in left side and right side when adopting hydraulic control.
This valve oil mouth A links to each other with the inlet/outlet of oil hydraulic motor M respectively with B, and pressure relief opening L links to each other with fuel tank, and oil pump feed enters this valve oil mouth P, oil outlet O and links to each other with fuel tank, and hydraulic fluid port A1, B1 communicate with hydraulic fluid port A, B respectively by external valve plate.When adopting the hydraulic control mode, control port X1, X2 link to each other with outside proportional reversing valve hydraulic fluid port respectively.
Hydraulic principle such as Fig. 1-2 of its rotary buffering valve illustrate, it has oil inlet P with oil outlet O and the hydraulic fluid port A and the B that remove to be connected the outside oil hydraulic motor on the valve body of main valve body, form installation cavity that each valve is installed and the inner flow passage that they are communicated with in the main valve body, there is trimmer valve 27 to be connected in the main valve body and connects respectively between the inner flow passage of hydraulic fluid port A and connection hydraulic fluid port B, the trimmer valve bypass is connected to selector valve 26, the left chamber of trimmer valve by inner flow passage and damping respectively with solenoid valve 30 imports, trimmer valve 27 right chambeies, pilot valve 28 imports connect, the outlet of solenoid valve 30 removes to connect adjustable back pressure valve 31, pilot valve 28 outlets connect pressure relief opening, the control valve 29 that three six logical types are arranged in main valve body in addition, be mounted with respectively about in this control valve pipeline connection and the reverse one-way valve that is communicated with, the control valve oil outlet connects the two ends of trimmer valve respectively by inner flow passage, the oil inlet P of main valve body and oil outlet O connect the filler opening and the return opening of control valve 29 respectively by inner flow passage and one-way valve, the middle Lu Yiduan of control valve 29 is connected with filler opening, the other end is divided into two-way, the one-way valve of leading up to is connected with the two ends of trimmer valve 27, and another road is connected with return opening.
In a main valve body, settle relevant valve in order to reach, and want easy production and assembly, it is compact simple that structure is wanted, advantage easy to use, trimmer valve 27 in its main valve body is to install like this, as Fig. 5, main valve body has the installation cavity of perforation between the inner flow passage that is communicated with hydraulic fluid port A and hydraulic fluid port B, built-in trimmer valve spool 11, the left end cross section of this trimmer valve spool is big, the right-hand member cross section is little, and the between position has the steel ball through hole, and is equipped with the selector valve that selector valve steel ball 10 constitutes bypass, the structure of selector valve is very simple like this, have the duct in the middle of the left end spool of trimmer valve simultaneously, one end and steel ball through hole join, and the other end is communicated with the left chamber of trimmer valve, spring eye is opened in right-hand member spool end, be supported with buffering valve core spring 6 between spring eye and the right chamber spring seat, Sealing arranged to reach necessary sealing on the surface of contact between trimmer valve spool and the installation cavity, left end just adopts the plug shutoff.Be noted that buffering spool outside oil pocket adopts inclined hole to be connected with A, B hydraulic fluid port, enlarged flow area, reduce flow resistance.The removable pilot valve 28 that is fixed with in installation cavity the other end at the buffering spool, it has through hole in the spring seat of trimmer valve, it is that tapered guide's spool 7 withstands on this through hole that head is arranged simultaneously, be supported with guide's valve core spring 8 between its rear end and the valve seat, pilot valve is installed cavity has inner flow passage to be communicated with the pressure relief opening of main valve body, valve seat with install cavity adopt be threaded fixing, both can Regulation spring elastic force, can become the plug that cavity is installed again.Main valve body is the removable solenoid valve 30 that is fixed with, and as Fig. 6, it can adopt and be threaded fixingly, changes during with the convenient electromagnetic coil fault, and is easy to maintenance.Main valve body is communicated with the installation cavity of the perforation of adjustable back pressure valve 31 in the outlet of solenoid valve, one end carries out shutoff with plug, the other end is removable to be fixed with adjustable back pressure valve, its structure is fixing separator in stair-stepping cavity, separator has through hole, adjustable back pressure spool 15 ends withstand on the separator simultaneously, be supported with adjustable back pressure valve core spring 16 between the adjusting element on afterbody and the adjustable back pressure valve, adjusting element is to be threaded with adjustable back pressure valve valve seat, be rotated the elastic force that fixed block just can Regulation spring like this, correspondingly adjust the pressure of back pressure.Main valve body is in oil inlet P, the inner flow passage of oil outlet O and hydraulic fluid port A, the removable preventing control valve core that is fixed with in position between the inner flow passage of hydraulic fluid port B, as Fig. 6, its structure is out to connect the installation cavity of main valve body, the built-in preventing control valve core valve rod 24 that promptly commutates, the built-in one-way valve of preventing control valve core left and right symmetrically, one-way valve is for being built-in one-way valve steel ball 19 at the built-in steel ball of preventing control valve core tapping, steel ball and be fixed between the fixed block of preventing control valve core end and be supported with built-in nonreturn valve core spring 18, main valve body is fixed with the sealing upper shield in the end that cavity is installed, wherein be supported with the control valve spring between a upper shield and the main valve plug, handling the spool left and right sides adopts O shape circle to seal, this valve can be worked under system high pressure power operating mode, can not reveal.Upper shield also drives control port respectively into and goes out control port, and adopts thread connecting mode, can external oil hydraulic circuit, make the action of preventing control valve core can adopt the hydraulic control mode, make operation more accurately, reliable, referring to Fig. 6,9.More than it is also noted that; between hydraulic fluid port A and B; handling spool center oil pocket and the straight-through outer drain port of fuel tank cancellation; both simplified structures; make oil hydraulic motor oil outlet pressure remain greater than return oil pressure valve spring set pressure non-vanishing again; oil hydraulic motor oil outlet back pressure makes oil hydraulic motor can keep stabilized (steady-state) speed when normal revolution like this, and can slow down shock effect when being subjected to impacting.Main valve body is mounted with return oil pressure spool 22 at its oil outlet, opens the hole in the middle of the return oil pressure spool simultaneously, and top is equipped with oil return repairing nonreturn valve core 20, is supported with return oil pressure valve core spring 21 between the fixed plate on bottom and the main valve body.
The major function and the working procedure of this valve are as follows:
Freely turn round
When crane was started working, load was connected with the suspension hook that hoists, when arm and weight not in same vertical surface, wirerope is oblique with load and is connected, the rotary fluid motor M that gets on the bus is subjected to load lateral forces to the left or to the right.This valve commutation this moment valve rod 24 is in the meta function, and oil pump feed enters this valve oil mouth P, directly by the off-load of hydraulic fluid port B oil sump tank, cuts off oil pump to oil hydraulic motor M hydraulic fluid port fuel feeding path.The actuating solenoid switch makes electromagnet 17 energisings, overcomes electromagnetic valve core spring 13 pretightening forces, promotes electromagnetic valve core 14 and moves to left, and makes it to be in position, left side function.At this moment, this valve oil mouth A that links to each other with oil hydraulic motor M hydraulic fluid port or the pressure of B are risen to the power effect by load side, be passed to buffering spool 11, promote selector valve steel ball 10 to a side shifting, cut off the path of hydraulic fluid port A-B through the steel ball groove, and be passed to buffering spool 11 left chambeies through buffering spool 11 endoporus, again through damping 2, oil duct 3, electromagnetic valve core filler opening 4, cross oil outlet and be passed to adjustable back pressure spool 15.Under back pressure, damping 2 and load lateral forces that adjustable back pressure valve core spring 16 pretightening forces produce, buffering spool 11 left cavity pressures rise to buffering valve core spring 6 pretightening forces, buffering spool 11 is moved to right, hydraulic fluid port A is communicated with B, oil hydraulic motor M does the low pressure revolution through A-B-M-A or B-A-M-B fluid loop under the load lateral forces, be same vertical surface until arm and load, the load lateral force disappears.
Normal revolution work:
Handle commutation valve rod 24 and move to left or move to right, make it to be in right position or position, left side function, the actuating solenoid switch makes electromagnet 17 power down, and electromagnetic valve core 14 is in right position function.Oil pump feed enters this valve from this valve oil inlet P, overcome built-in nonreturn valve core spring 18 pretightening forces of commutation valve rod, built-in one-way valve steel ball 19 is moved to right, fluid enters hydraulic fluid port B or A through inner flow passage 9, promote selector valve steel ball 10 to a side shifting, cut off the path of hydraulic fluid port A-B through the steel ball groove, another Lu Zaijing buffering spool 11 endoporus enter buffering spool 11 left chambeies, enter buffering spool 11 right chambeies through damping 2,5 again, left and right chamber makes buffering spool 11 be in closed condition under area difference and 6 effects of buffering valve core spring, cuts off hydraulic fluid port B-A direct path.The pressure oil of hydraulic fluid port B or A enters oil hydraulic motor M hydraulic fluid port, promoting oil hydraulic motor M rotates, crane revolution, oil hydraulic motor M oil return is through this valve oil mouth A or B, inner flow passage, the built-in nonreturn valve core 19 of commutation valve rod, inner flow passage 23, return oil pressure spool 22, from this valve oil outlet O oil sump tank.
The protection of normal revolution overload buffer
When normal revolution work, oil pump feed pressure rises gradually, and the unlifting pressure of hydraulic fluid port A or B enters buffering spool 11 left chambeies through buffering spool 11 endoporus, again through damping 2,5, oil duct 4, enter buffering spool 11 right chambeies.When buffering spool 11 right chamber oil liquid pressures surpass 8 pretightening force moments of guide's valve core spring, guide's spool 7 moves to right, and buffering spool 11 right chamber oil pressure are through guide's spool 7, the off-load of drain tap L oil sump tank; And buffering spool 11 left chamber fluid are under the effect of two dampings and oil duct 4; still can keep elevated pressures; overcome buffering valve core spring 6 pretightening forces; promoting buffering spool 11 moves to right; make hydraulic fluid port A and B straight-through, realize shunting, oil hydraulic motor M inlet pressure and flow are limited; it is stable that rotating speed keeps, and realizes the NOL normal overload protection.
Protection of normal revolution damping of shocks and negative moment repairing
When normal revolution work; hydraulic system produces moment impact pressure such as load for some reason, arm rocks etc.; the oil pressure of hydraulic fluid port A or B rises rapidly; be passed to buffering spool 11 left chambeies; because being passed to buffering spool 11 right chambeies needs through two dampings and oil duct 4; time lag; making buffering spool 11 left chamber high pressure promote to cushion spool 11 at once moves to right; compressing buffering spool 11 right chamber fluid make it pressure and rise to guide's valve core spring 8 pretightening forces rapidly; open 7 off-loads of guide's spool; buffering spool 11 is opened, and hydraulic fluid port A and B are straight-through, realize the damping of shocks protection.
Turn to identical as the moment impact pressure direction with oil hydraulic motor M, oil hydraulic motor M negative moment is rotated, be the oil pump function, cause the oil pump feed deficiency, repairing nonreturn valve core 25 and oil return repairing nonreturn valve core 20 are opened by negative pressure, fluid is drawn to oil hydraulic motor M inlet from fuel tank through oil return repairing nonreturn valve core 20, inner flow passage 23, repairing nonreturn valve core 25, realizes the repairing function.
Stop to turn round the repairing of inertia negative moment
Handle the commutation valve rod and move and make it to be in the meta function, oil pump feed advance this valve oil inlet P through inner flow passage 23, return oil pressure spool 22 directly by oil outlet O oil sump tank, make oil hydraulic motor M stall.Simultaneously, load is because inertia makes oil hydraulic motor M produce the negative moment rotation, repairing nonreturn valve core 25 is opened under suction function, and oil inlet P fluid to oil hydraulic motor M fuel feeding, realizes stopping to turn round the repairing of inertia negative moment through inner flow passage 23, repairing nonreturn valve core 25, hydraulic fluid port A or B.
Claims (9)
1, a kind of rotary buffering valve, it includes valve body, it is characterized in that on the valve body of main valve body, having filler opening with oil outlet and the hydraulic fluid port that removes to be connected the outside oil hydraulic motor, form installation cavity that each valve is installed and the inner flow passage that they are communicated with in the main valve body, there is trimmer valve to be connected between the inner flow passage that connects hydraulic fluid port respectively in the main valve body, the trimmer valve bypass is connected to selector valve, the left chamber of trimmer valve by inner flow passage and damping respectively with the solenoid valve import, the right chamber of trimmer valve, the pilot valve import connects, the outlet of solenoid valve removes to connect adjustable back pressure valve, the pilot valve outlet connects pressure relief opening, the control valve that three six logical types are arranged in main valve body in addition, be mounted with respectively about in this control valve pipeline connection and the reverse one-way valve that is communicated with, the control valve oil outlet connects the two ends of trimmer valve respectively by inner flow passage, the filler opening of main valve body and oil outlet connect the filler opening and the return opening of control valve respectively by inner flow passage and one-way valve, the middle Lu Yiduan of control valve is connected with filler opening, the other end is divided into two-way, the one-way valve of leading up to is connected with the two ends of trimmer valve, and another road is connected with return opening.
2, rotary buffering valve according to claim 1, it is characterized in that described main valve body has the installation cavity between the inner flow passage that is communicated with hydraulic fluid port and hydraulic fluid port, built-in trimmer valve spool, the left end cross section of this trimmer valve spool is big, the right-hand member cross section is little, the between position has the steel ball through hole, and be equipped with the selector valve that steel ball constitutes bypass, have the duct in the middle of the left end spool of trimmer valve simultaneously, one end and steel ball through hole join, and the other end is communicated with the left chamber of trimmer valve, and spring eye is opened in right-hand member spool end, be supported with the buffering valve core spring between spring eye and the right chamber spring seat, on the surface of contact Sealing arranged between trimmer valve spool and the installation cavity.
3, rotary buffering valve according to claim 2, it is characterized in that installation cavity end removable the be fixed with pilot valve of described main valve body at the buffering spool, it has through hole in the spring seat of trimmer valve, it is that tapered pilot valve core withstands on this through hole that head is arranged simultaneously, be supported with guide's valve core spring between its rear end and the valve seat, pilot valve is installed cavity has inner flow passage to be communicated with the pressure relief opening of main valve body.
4, rotary buffering valve according to claim 3 is characterized in that described removable being fixed as is threaded.
5, rotary buffering valve according to claim 1 is characterized in that the removable Motionless electromagnetic valve of described main valve body.
6, rotary buffering valve according to claim 1, it is characterized in that described main valve body is communicated with the installation cavity of adjustable back pressure valve in the outlet of solenoid valve, this installation cavity end is removable to be fixed with adjustable back pressure valve, its structure is fixing separator in stair-stepping cavity, separator has through hole, the spool end of adjustable back pressure valve withstands on the separator simultaneously, be supported with adjustable back pressure valve spring between the adjusting element on afterbody and the adjustable back pressure valve, adjusting element is to be threaded with adjustable back pressure valve valve seat.
7, rotary buffering valve according to claim 1, it is characterized in that described main valve body is at filler opening, the removable preventing control valve core that is fixed with in position between the inner flow passage of the inner flow passage of oil outlet and two hydraulic fluid ports, its structure is out to connect the installation cavity of main valve body, built-in preventing control valve core, the built-in one-way valve of preventing control valve core left and right symmetrically, one-way valve is at the built-in steel ball of preventing control valve core tapping, steel ball and be fixed between the fixed block of preventing control valve core end and be supported with spring, main valve body is fixed with the sealing upper shield in the end that cavity is installed, and wherein is supported with the control valve spring between a upper shield and the main valve plug.
8, rotary buffering valve according to claim 7 is characterized in that described upper shield drives control port respectively into and goes out control port, makes control valve become the hydraulic control control valve.
9, rotary buffering valve according to claim 1, it is characterized in that described main valve body is mounted with the return oil pressure spool at its oil outlet, open the hole in the middle of the return oil pressure spool simultaneously, top is equipped with oil return repairing nonreturn valve core, is supported with the return oil pressure valve core spring between the fixed plate on bottom and the main valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011426055A CN1175190C (en) | 2001-12-10 | 2001-12-10 | Rotary buffering valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011426055A CN1175190C (en) | 2001-12-10 | 2001-12-10 | Rotary buffering valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1350126A true CN1350126A (en) | 2002-05-22 |
| CN1175190C CN1175190C (en) | 2004-11-10 |
Family
ID=4676838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011426055A Expired - Fee Related CN1175190C (en) | 2001-12-10 | 2001-12-10 | Rotary buffering valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1175190C (en) |
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| CN102155447A (en) * | 2011-03-15 | 2011-08-17 | 徐州重型机械有限公司 | Rotating hydraulic system of crane and rotating buffer valve thereof |
| CN102229416A (en) * | 2011-06-29 | 2011-11-02 | 三一汽车起重机械有限公司 | Closed-type rotary hydraulic system for crane and crane |
| CN102408074A (en) * | 2011-10-28 | 2012-04-11 | 上海三一科技有限公司 | System and method for limiting crane rotation region and crane comprising the system |
| CN102454648A (en) * | 2010-10-18 | 2012-05-16 | 印辉 | Two-stage pressure revolution cushion valve |
| CN102493967A (en) * | 2011-11-21 | 2012-06-13 | 三一汽车起重机械有限公司 | Crane, rotation control system thereof and rotation buffering valve of crane |
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- 2001-12-10 CN CNB011426055A patent/CN1175190C/en not_active Expired - Fee Related
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| CN102454648A (en) * | 2010-10-18 | 2012-05-16 | 印辉 | Two-stage pressure revolution cushion valve |
| CN102155447A (en) * | 2011-03-15 | 2011-08-17 | 徐州重型机械有限公司 | Rotating hydraulic system of crane and rotating buffer valve thereof |
| CN102155447B (en) * | 2011-03-15 | 2013-06-05 | 徐州重型机械有限公司 | Rotating hydraulic system of crane and rotating buffer valve thereof |
| CN102229416A (en) * | 2011-06-29 | 2011-11-02 | 三一汽车起重机械有限公司 | Closed-type rotary hydraulic system for crane and crane |
| CN102229416B (en) * | 2011-06-29 | 2013-06-05 | 三一汽车起重机械有限公司 | Closed-type rotary hydraulic system for crane and crane |
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| CN110552920A (en) * | 2019-09-27 | 2019-12-10 | 潍柴动力股份有限公司 | Valve body structure, hydraulic system and walking machinery for reducing back pressure |
| CN110552920B (en) * | 2019-09-27 | 2021-10-08 | 潍柴动力股份有限公司 | Valve body structure, hydraulic system and walking machinery for reducing back pressure |
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| CN1175190C (en) | 2004-11-10 |
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