CN102229416B - Closed-type rotary hydraulic system for crane and crane - Google Patents
Closed-type rotary hydraulic system for crane and crane Download PDFInfo
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- CN102229416B CN102229416B CN 201110179255 CN201110179255A CN102229416B CN 102229416 B CN102229416 B CN 102229416B CN 201110179255 CN201110179255 CN 201110179255 CN 201110179255 A CN201110179255 A CN 201110179255A CN 102229416 B CN102229416 B CN 102229416B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
- B66C23/86—Slewing gear hydraulically actuated
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Abstract
The invention discloses a closed-type rotary hydraulic system for a crane. The system comprises a closed-type hydraulic pump (10) and a rotary motor (20), wherein an oil outlet of the closed-type hydraulic pump (10) is connected with an oil inlet of the rotary motor (20); and an oil outlet of the rotary motor (20) is connected with an oil inlet of the closed-type hydraulic pump (10). The system is characterized by further comprising a buffering damper (30), and the buffering damper (30) is connected in parallel with the rotary motor (20) on a hydraulic oil line. The system has very reliable stability in the starting, stopping and rotating processes, and also has a smaller hydraulic structure. The invention also discloses a crane which is provided with the closed-type rotary hydraulic system.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to the closed rotary hydraulic efficiency pressure system of hoisting crane.The invention still further relates to the hoisting crane that is provided with described closed rotary hydraulic efficiency pressure system.
Background technology
Hoisting crane is a kind ofly to utilize the crane arm weight of slinging in when work, then relies on rotation of rotary table with the construction machinery and equipment of weight from a position transfer to the another one position.
Swing type mechanism is that the rotating part of hoisting crane is realized the device of gyroscopic movement with respect to non-rotating part, the effect of swing type mechanism is to make upper frame part do gyroscopic movement around the center of gyration of hoisting crane, and will get on the bus and get off in the mode of rolling support and be connected, the load of getting on the bus is delivered on chassis frame, and its dynamic characteristics directly affects the operating characteristic of whole hoisting crane.
The crane rotation operation has that rotor inertia is large, inertia is large, open the characteristics such as the braking impact load is large, and its hydraulic efficiency pressure system generally has open-circuit system and two kinds of implementations of closed system:
Open-circuit system refers to Hydraulic Pump from the fuel tank oil suction, and hydraulic oil drives hydraulic actuator after various control cock, then flow back to fuel tank, and this system architecture is comparatively simple, can bring into play heat radiation, the precipitated impurities effect of fuel tank.Owing to there being reversing impact, and fluid often contacts with air, makes air be easy to the infiltration system, causes the rotary stability of mechanism poor;
Closed system refers to that the oil inlet of Hydraulic Pump directly is connected with the oil return pipe of power element, and hydraulic oil carries out close cycle in the pipeline of system; Its compact conformation, few with the air touch opportunity, air is difficult for the infiltration system, owing to not containing change-over valve, has reduced reversing impact, is conducive to realize rotating stability, has avoided the hydraulic efficiency impact and the degradation of energy that occur in the open-circuit system commutation process.
In closed system, usually adoption rate pump, cover-plate type inserted valve etc. are realized rotating steady control, number are to comprise the disclosed Caterpillar crane rotatory closed system of utility model patent specification sheets (seeing Fig. 1) of CN 201433063Y as Granted publication:
Enclosed controllable capacity pump 1;
At least two fixed displacement motors are followed successively by the first fixed displacement motor 3, the second fixed displacement motor 4, the 3rd fixed displacement motor 5;
Also comprise two-speed valve group 2, this two-speed valve group has A1 mouth, B1 mouth, A2 mouth and B2 mouth, and this two-speed valve group also comprises:
Check valve 21 and check valve 21 ', opposing being series between A1 mouth and B1 mouth;
Two-position four way change valve 22, its P mouth is connected between two check valves by pipeline;
three logic inserted valves, wherein, the control mouth of the first logic inserted valve 23 and the second logic inserted valve 24 all is connected in the B mouth of two-position four way change valve 22, the control mouth of the 3rd logic inserted valve 25 is connected in the A mouth of two-position four way change valve 22, the B mouth of the first logic inserted valve 23 is connected in described B1 mouth, the B mouth of the second logic inserted valve 24 is connected in described A1 mouth, the A mouth of the second logic inserted valve 24 and the 3rd logic inserted valve 25 is connected to the A2 mouth, the B mouth of the A mouth of the first logic inserted valve 23 and the 3rd logic inserted valve 25 is connected in the B2 mouth, be connected in A1 mouth and B1 mouth after described enclosed controllable capacity pump 1 and at least one fixed displacement motor parallel connection, described A2, the B2 mouth is connected with the B mouth with the A mouth of a certain amount of motor at least and is connected.
This closed system realizes rotating steady control by enclosed controllable capacity pump, two-speed valve group etc., although can satisfy to a certain extent the operating needs of hoisting crane, but start, stop and turning course in still have certain impact, and can't avoid the temporary impact that causes because of load changing.
In addition, this closed system is too complicated, hydraulic tubing and control component number are too many, not only manufacturing cost is higher, and maintenance difficulties is larger, and the trouble point that may exist is more, the probability that the revolution fault occurs is relatively high, when carrying out free rotary, need a plurality of control cock coordinations of operation, operating personal has been proposed high requirement.
Therefore, how improving the stationarity of hoisting crane closed rotary hydraulic efficiency pressure system by comparatively simple mode, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The first purpose of the present invention is to provide a kind of hoisting crane closed rotary hydraulic efficiency pressure system.This hydraulic efficiency pressure system start, stop and turning course in have very failure-free stationary performance, and hydraulic structure is comparatively simple.
The second purpose of the present invention is to provide a kind of hoisting crane that is provided with above-mentioned closed rotary hydraulic efficiency pressure system.
In order to realize above-mentioned the first purpose, the invention provides a kind of hoisting crane closed rotary hydraulic efficiency pressure system, comprise closed type hydraulic pump and rotary motor, the oil outlet of described closed type hydraulic pump is connected with the oil inlet of described rotary motor, the oil outlet of described rotary motor is connected with the oil inlet of described closed type hydraulic pump, it is characterized in that, further comprise buffer damping, described buffer damping and rotary motor are in parallel on hydraulic circuit.
Preferably, the discharge capacity of the damping hole diameter of described buffer damping and described closed type hydraulic pump and rotary motor is complementary.
Preferably, the oil circuit control of the drg of described rotary motor is provided with two-position four way change valve and reducing valve, the P hydraulic fluid port of described two-position four way change valve connects the oil return fuel tank for P hydraulic fluid port, the B hydraulic fluid port of controlling oily oil inlet, the described reducing valve of A hydraulic fluid port connection for cut-off hydraulic fluid port, T hydraulic fluid port, and the A hydraulic fluid port of described reducing valve connects the oil inlet of described drg.
Preferably, described reducing valve is parallel with and allows hydraulic oil to flow to the check valve of described two-position four way change valve A hydraulic fluid port from described drg, and described reducing valve and check valve form one way pressure-reducing valve.
Preferably, be provided with fixedly damping between the oil-feed oil circuit of the release oil circuit of described rotary motor and described drg.
Preferably, the damping hole diameter range of described fixedly damping is between 0.3mm-1.5mm.
Preferably, described closed type hydraulic pump is enclosed electricity proportioning pump.
In order to realize above-mentioned the second purpose, the present invention also provides a kind of hoisting crane, comprises crane main body, swing type mechanism and Hydraulic slewing system, and described Hydraulic slewing system is specially the described hoisting crane closed rotary of above-mentioned any one hydraulic efficiency pressure system.
Hoisting crane closed rotary hydraulic efficiency pressure system provided by the present invention, comprise closed type hydraulic pump, rotary motor and buffer damping, the oil outlet of described closed type hydraulic pump is connected with the oil inlet of described rotary motor, the oil outlet of described rotary motor is connected with the oil inlet of described closed type hydraulic pump, and described buffer damping and rotary motor are in parallel on hydraulic circuit.By the working connection perforation of buffer damping with the rotary motor two ends, when revolution starts, can be with a little pressure oil off-load to the rotary motor other end by buffer damping, make revolution start reposefully, when revolution stops, the pressure oil partial relief that inertia can be produced by buffer damping is to the rotary motor other end, make revolution stop reposefully, revolution is carried out in process, can filter spike pressure by buffer damping, make turning course steady, during lift heavy palpus centering, can realize free rotary by buffer damping.
compare with existing hoisting crane closed rotary hydraulic efficiency pressure system, the present invention only needs a buffer damping can realize starting, stop and the smooth running of turning course, thereby make whole hydraulic efficiency pressure system obtain maximum simplification, its component number is less, can significantly reduce manufacturing cost, maintenance difficulties, probability of failure and operation requirements, hydraulic tubing is connected become simpler, not only dwindled installing space, and reduced by pipeline and connected leakage and the pipe vibration cause, improved the reliability of system, simplified operating process, through verification experimental verification, gyroscopic effects is very good, can effectively avoid turning round fault, guarantee man-machine safety.
Hoisting crane provided by the present invention is provided with above-mentioned hoisting crane closed rotary hydraulic efficiency pressure system, and because above-mentioned hoisting crane closed rotary hydraulic efficiency pressure system has above-mentioned technique effect, the hoisting crane with this hoisting crane closed rotary hydraulic efficiency pressure system also should possess corresponding technique effect.
Description of drawings
Fig. 1 is the hydraulic schematic diagram of a kind of Caterpillar crane rotatory closed system in prior art;
Fig. 2 is the hydraulic schematic diagram of hoisting crane closed rotary hydraulic efficiency pressure system provided by the present invention.
In Fig. 1:
Enclosed controllable capacity pump 2. two-speed valve group 3. first fixed displacement motor 4. second fixed displacement motor 5. the 3rd fixed displacement motors 21,21 '. check valve 22. two-position four way change valve 23. first logic inserted valve 24. second logic inserted valve 25. the 3rd logic inserted valves
In Fig. 2:
10. closed type hydraulic pump 20. rotary motor 30. buffer damping 40. drg 50. two-position four way change valve 60. reducing valve 70. fixedly dampings of check valve 80.
The specific embodiment
Core of the present invention is to provide a kind of hoisting crane closed rotary hydraulic efficiency pressure system.This hydraulic efficiency pressure system start, stop and turning course in have very failure-free stationary performance, and hydraulic structure is comparatively simple.
In order to make those skilled in the art person understand better the present invention program, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 2, Fig. 2 is the hydraulic schematic diagram of hoisting crane closed rotary hydraulic efficiency pressure system provided by the present invention.
In a kind of specific embodiment, hoisting crane closed rotary hydraulic efficiency pressure system provided by the invention, comprise closed type hydraulic pump 10 and rotary motor 20, the oil outlet of closed type hydraulic pump 10 is connected with the oil inlet of rotary motor 20, the oil outlet of rotary motor 20 is connected with the oil inlet of closed type hydraulic pump 10, form the hydraulic circuit of sealing, i.e. closed fhdraulic system.
Closed type hydraulic pump 10 can adopt enclosed electricity proportioning pump, its flow can be in the 0-100% scope step-less adjustment, need not change-over valve, change flow and the direction of hydraulic oil in working connection by the variable of pump, realize speed change and the commutation of rotary motor 20, its fine motion is good, and stable working.
For improve hydraulic efficiency pressure system start, stop and turning course in stationarity, here further be provided with buffer damping 30, one end of buffer damping 30 is communicated with the oil inlet of rotary motor 20, the other end is communicated with the oil outlet of rotary motor 20, and namely buffer damping 30 is in parallel on hydraulic circuit with rotary motor 20.
The discharge capacity of the damping hole diameter of buffer damping 30 and closed type hydraulic pump 10 and rotary motor 20 is complementary, if the diameter of damping hole is excessive, have excessive hydraulic oil and flow to low tension terminal from the high-pressure side of rotary motor 20, and can't the driven rotary motor, if the diameter of damping hole is too small, the hydraulic oil that denier only arranged flows to low tension terminal from the high-pressure side of rotary motor 20, can't play the effect of off-load.
The oil circuit control of drg 40 (dotted portion) is provided with change-over valve and reducing valve 60, here adopted two-position four way change valve 50, its P hydraulic fluid port is for controlling oily oil inlet, the A hydraulic fluid port connects the oil inlet of reducing valve 60, the B hydraulic fluid port is the cut-off hydraulic fluid port, the T hydraulic fluid port connects fuel tank, the oil inlet of the oil outlet connecting brake 40 of reducing valve 60.
Reducing valve 60 is parallel with check valve 70, forms one way pressure-reducing valve with check valve 70, and this check valve 70 only allows hydraulic oil to flow to the A hydraulic fluid port of two-position four way change valve 50 from drg 40.
During brake off, the right position work of two-position four way change valve 50, its P hydraulic fluid port is communicated with the A hydraulic fluid port, and the T hydraulic fluid port is communicated with the B hydraulic fluid port, hydraulic oil overcomes the effect brake off of spring force through the P hydraulic fluid port of its P hydraulic fluid port, A hydraulic fluid port and reducing valve 60, the brake cylinder that the A hydraulic fluid port enters drg 40.
During braking, the left position work of two-position four way change valve 50, its P hydraulic fluid port is communicated with the B hydraulic fluid port, the A hydraulic fluid port is communicated with the T hydraulic fluid port, hydraulic oil in brake cylinder returns to fuel tank through A hydraulic fluid port, the T hydraulic fluid port of check valve 70, two-position four way change valve 50, and the spring reset of drg 40 enters braking mode.
Be provided with fixedly damping 80 between the release oil circuit of rotary motor 20 and the oil-feed oil circuit of drg 40, fixedly the damping hole diameter range of damping 80 can be controlled between 0.3mm-1.5mm.
Enclosed electricity proportioning pump 10 of the present invention connects two pressure hydraulic fluid ports of rotary motor 20, controlling oil opens drg through proportional pressure-reducing valve 60, effective buffering by buffer damping 30, operate automatically controlled rotary handle and control the proportional current output of enclosed electricity proportioning pump 10, can realize that revolution starts steadily, revolution stops steadily, in turning course steadily and free rotary, its specific works process is as follows:
1) revolution starts steadily
When revolution starts, turn round electric control handle by operation, the discharge capacity of enclosed electricity proportioning pump 10 is slowly increased by zero, drive rotary motor 20 actions, pressure oil has a little from buffer damping 30 off-loads to rotary motor 20 other ends, when having avoided revolution to start, pressure increase suddenly impacts, and revolution is started reposefully.
2) revolution stops steadily
When revolution stops, turn round electric control handle by operation, make the discharge capacity of enclosed electricity proportioning pump 10 by more slowly being kept to zero, this moment, pressure oil had a little from buffer damping 30 off-loads to rotary motor 20 other ends, avoided the inertia effects build-up of pressure when stopping to increase suddenly, impact thereby produce when having avoided stopping, revolution is stopped reposefully.
3) steady in turning course
In turning course, when load changing, buffer damping 30 can effectively filter spike pressure by a little pressure oil of timely off-load, avoids the temporary impact that causes because of load changing, thereby guarantees the steady operation of lifting function in turning course.
4) free rotary
During lift heavy centering palpus free rotary, must not operate the revolution electric control handle, only need two-position four way change valve 50 to get electric, this moment is due to the effect of unbalance loading, make fluid through buffer damping 30 from rotary motor 20 1 end off-loads to the other end, thereby realize free rotary, probability of failure is little.
As seen, the present invention can with a little pressure oil off-load to rotary motor 20 other ends, make revolution start reposefully by buffer damping 30; Revolution is when stopping, and the pressure oil partial relief that inertia can be produced by buffer damping 30 makes revolution stop reposefully to rotary motor 20 other ends; Revolution is carried out can filtering spike pressure by buffer damping 30 in process, makes turning course steady; During lift heavy palpus centering, can realize free rotary by buffer damping 30.
compare with existing hoisting crane closed rotary hydraulic efficiency pressure system, the present invention only needs a buffer damping 30 can realize starting, stop and the smooth running of turning course, thereby make whole hydraulic efficiency pressure system obtain maximum simplification, its component number is less, can significantly reduce manufacturing cost, maintenance difficulties, probability of failure and operation requirements, hydraulic tubing is connected become simpler, not only dwindled installing space, and reduced by pipeline and connected leakage and the pipe vibration cause, improved the reliability of system, simplified operating process, through verification experimental verification, gyroscopic effects is very good, can effectively avoid turning round fault, guarantee man-machine safety.
Above-mentioned hoisting crane closed rotary hydraulic efficiency pressure system is only a kind of preferred version, and its concrete structure is not limited to this, can make according to actual needs pointed adjustment on this basis, thereby obtains different embodiments.For example adopt the change-over valve replacement two-position four way change valve of other type to carry out commutation function, as long as can control the drg action by the flow direction of setting.
Except above-mentioned hoisting crane closed rotary hydraulic efficiency pressure system, the present invention also provides a kind of hoisting crane, comprise crane main body, swing type mechanism and Hydraulic slewing system, described Hydraulic slewing system is specially above-described hoisting crane closed rotary hydraulic efficiency pressure system, all the other structures please refer to prior art, and this paper repeats no more.
Above hoisting crane closed rotary hydraulic efficiency pressure system provided by the present invention and hoisting crane are described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (8)
1. hoisting crane closed rotary hydraulic efficiency pressure system, comprise closed type hydraulic pump (10) and rotary motor (20), the oil outlet of described closed type hydraulic pump (10) is connected with the oil inlet of described rotary motor (20), the oil outlet of described rotary motor (20) is connected with the oil inlet of described closed type hydraulic pump (10), it is characterized in that, further comprise buffer damping (30), described buffer damping (30) is in parallel on hydraulic circuit with rotary motor (20).
2. hoisting crane closed rotary hydraulic efficiency pressure system according to claim 1, is characterized in that, the discharge capacity of the damping hole diameter of described buffer damping (30) and described closed type hydraulic pump (10) and rotary motor (20) is complementary.
3. the described hoisting crane closed rotary of according to claim 1 to 2 any one hydraulic efficiency pressure system, it is characterized in that, the oil circuit control of the drg (40) of described rotary motor (20) is provided with two-position four way change valve (50) and reducing valve (60), the P hydraulic fluid port of described two-position four way change valve (50) connects the oil return fuel tank for P hydraulic fluid port, the B hydraulic fluid port of controlling oily oil inlet, the A hydraulic fluid port described reducing valve of connection (60) for cut-off hydraulic fluid port, T hydraulic fluid port, and the A hydraulic fluid port of described reducing valve (60) connects the oil inlet of described drg (40).
4. hoisting crane closed rotary hydraulic efficiency pressure system according to claim 3, it is characterized in that, described reducing valve (60) is parallel with and allows hydraulic oil to flow to the check valve (70) of described two-position four way change valve (50) A hydraulic fluid port from described drg (40), and described reducing valve (60) forms one way pressure-reducing valve with check valve (70).
5. hoisting crane closed rotary hydraulic efficiency pressure system according to claim 4, is characterized in that, is provided with fixedly damping (80) between the oil-feed oil circuit of the release oil circuit of described rotary motor (20) and described drg (40).
6. hoisting crane closed rotary hydraulic efficiency pressure system according to claim 5, is characterized in that, the damping hole diameter range of described fixedly damping (80) is between 0.3mm-1.5mm.
7. hoisting crane closed rotary hydraulic efficiency pressure system according to claim 6, is characterized in that, described closed type hydraulic pump (10) is enclosed electricity proportioning pump.
8. a hoisting crane, comprise crane main body, swing type mechanism and Hydraulic slewing system, it is characterized in that, described Hydraulic slewing system is specially the claims 1 to the 7 described hoisting crane closed rotary of any one hydraulic efficiency pressure system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110179255 CN102229416B (en) | 2011-06-29 | 2011-06-29 | Closed-type rotary hydraulic system for crane and crane |
| PCT/CN2012/074212 WO2013000321A1 (en) | 2011-06-29 | 2012-04-17 | Closed rotary hydraulic system for crane and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110179255 CN102229416B (en) | 2011-06-29 | 2011-06-29 | Closed-type rotary hydraulic system for crane and crane |
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| Publication Number | Publication Date |
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| CN102229416A CN102229416A (en) | 2011-11-02 |
| CN102229416B true CN102229416B (en) | 2013-06-05 |
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| CN 201110179255 Active CN102229416B (en) | 2011-06-29 | 2011-06-29 | Closed-type rotary hydraulic system for crane and crane |
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| CN (1) | CN102229416B (en) |
| WO (1) | WO2013000321A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102602830B (en) * | 2012-03-06 | 2013-11-20 | 中联重科股份有限公司 | Hydraulic rotary system and engineering vehicle |
| CN102730582B (en) * | 2012-06-20 | 2014-12-17 | 上海三一科技有限公司 | Hydraulic rotary system start-stop buffering device, and crane |
| CN102865262B (en) * | 2012-09-07 | 2015-10-28 | 三一重工股份有限公司 | Hydraulic slewing system and engineering machinery |
| CN102877783B (en) * | 2012-09-28 | 2014-10-15 | 三一重工股份有限公司 | Rotary drilling rig and hydraulic rotation system thereof |
| PE20150637A1 (en) | 2012-10-16 | 2015-05-08 | Almirall Sa | PYRROLOTRIAZINONE DERIVATIVES AS PI3K INHIBITORS |
| CN103523686B (en) * | 2013-11-01 | 2015-05-20 | 太原重工股份有限公司 | Large traveling crane |
| CN103723632B (en) * | 2013-12-13 | 2016-06-08 | 中联重科股份有限公司 | The revolving-control method of lifting machine, rotary control system and lifting machine |
| CN105439018B (en) * | 2014-11-26 | 2018-02-16 | 徐州重型机械有限公司 | Revolution hydraulic control system and crane with sectional control function |
| CN105156392B (en) * | 2015-09-23 | 2017-12-15 | 武汉船用机械有限责任公司 | A kind of revolution closed type hydraulic system of pipeline heating vent valve and crane |
| CN105351276B (en) * | 2015-12-03 | 2017-09-19 | 徐州重型机械有限公司 | Turn round hydraulic control system, method and crane |
| CN106681238A (en) * | 2017-03-15 | 2017-05-17 | 天空概念（北京）防务科技有限公司 | Rotary mechanism control circuit and control method |
| CN107169254B (en) * | 2017-07-21 | 2020-04-28 | 济南大学 | Method for evaluating performance and predicting residual life of rotary system of automobile crane |
| CN107740747A (en) * | 2017-10-13 | 2018-02-27 | 三汽车起重机械有限公司 | The control method of speed limit hydraulic motor, crane and motor rotary speed |
| CN111734696B (en) * | 2020-07-02 | 2022-04-08 | 浙江中液机械设备有限公司 | Closed hydraulic system based on closed-loop control and control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350126A (en) * | 2001-12-10 | 2002-05-22 | 卢永松 | Rotary buffering valve |
| CN101229902A (en) * | 2008-02-19 | 2008-07-30 | 湖南三一起重机械有限公司 | Hydraulic oil distribution controlling device for crane hydraulic system |
| CN201580934U (en) * | 2009-06-15 | 2010-09-15 | 徐州重型机械有限公司 | Crane and winch hydraulic control system thereof, liquid-filling integrated valve used for system |
| CN201729610U (en) * | 2010-07-26 | 2011-02-02 | 徐州重型机械有限公司 | Rotary hydraulic system of crane and crane |
| CN201825681U (en) * | 2010-07-16 | 2011-05-11 | 徐州重型机械有限公司 | Crane and hydraulic control system of hoisting device thereof |
| CN102094861A (en) * | 2010-12-02 | 2011-06-15 | 徐州重型机械有限公司 | Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04131568A (en) * | 1990-09-19 | 1992-05-06 | Toyota Motor Corp | Hydraulic transmission device |
| CN2931433Y (en) * | 2006-06-12 | 2007-08-08 | 上海三一科技有限公司 | Enclosed up-down hydraulic system |
| CN201793324U (en) * | 2010-09-01 | 2011-04-13 | 三一汽车起重机械有限公司 | Crane and closed rotary control system thereof |
| CN102030267B (en) * | 2011-01-17 | 2012-09-05 | 徐州重型机械有限公司 | Hoist and closed hydraulic system thereof |
| 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 |
-
2011
- 2011-06-29 CN CN 201110179255 patent/CN102229416B/en active Active
-
2012
- 2012-04-17 WO PCT/CN2012/074212 patent/WO2013000321A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350126A (en) * | 2001-12-10 | 2002-05-22 | 卢永松 | Rotary buffering valve |
| CN101229902A (en) * | 2008-02-19 | 2008-07-30 | 湖南三一起重机械有限公司 | Hydraulic oil distribution controlling device for crane hydraulic system |
| CN201580934U (en) * | 2009-06-15 | 2010-09-15 | 徐州重型机械有限公司 | Crane and winch hydraulic control system thereof, liquid-filling integrated valve used for system |
| CN201825681U (en) * | 2010-07-16 | 2011-05-11 | 徐州重型机械有限公司 | Crane and hydraulic control system of hoisting device thereof |
| CN201729610U (en) * | 2010-07-26 | 2011-02-02 | 徐州重型机械有限公司 | Rotary hydraulic system of crane and crane |
| CN102094861A (en) * | 2010-12-02 | 2011-06-15 | 徐州重型机械有限公司 | Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013000321A1 (en) | 2013-01-03 |
| CN102229416A (en) | 2011-11-02 |
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