CN103010980B - Rotary control hydraulic system and crane - Google Patents

Rotary control hydraulic system and crane Download PDF

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Publication number
CN103010980B
CN103010980B CN201210527907.4A CN201210527907A CN103010980B CN 103010980 B CN103010980 B CN 103010980B CN 201210527907 A CN201210527907 A CN 201210527907A CN 103010980 B CN103010980 B CN 103010980B
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valve
communicated
control
oil
working connection
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CN103010980A (en
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王守伟
王清送
胡小冬
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Xuzhou Heavy Machinery Co Ltd
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Xuzhou Heavy Machinery Co Ltd
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Abstract

The invention discloses a rotary control hydraulic system and a crane. The rotary control hydraulic system disclosed comprises a pilot oil passage, a hydraulic control main reversing valve for controlling the flow direction and on/off of a main oil passage by the pilot oil passage, and a cushion valve, wherein the cushion valve is provided with a first working oil port, a second working oil port and a control oil port for controlling the on/off of the first and the second working oil ports. When the first and the second working oil ports are communicated with each other, the high pressure segment of the main oil passage is communicated with an oil return passage through the cushion valve, the control oil port of the cushion valve is communicated with the pilot oil passage, a damp is arranged on a passage from the control oil port to the pilot oil passage, and the control oil port of the cushion valve is communicated with the pilot oil passage, and the pilot oil source is a low-pressure and stable oil source which is independent from a load pressure. Compared with the background art that the cushion valve is communicated with the feedback oil passage having larger fluctuation, the cushion valve, provided by the invention, is not affected by load fluctuation and can give a timely response for cushioning, so that the rotary system keeps more stable during start-up and stop.

Description

Revolution hydraulic control system and hoisting crane
Technical field
The present invention relates to technical field of engineering machinery, particularly one revolution hydraulic control system and hoisting crane.
Background technology
Can held stationary, reliable and without impact, be all generally realize this function by rotary buffering valve when car hosit rotary control system mainly ensures to start and stop.
Please refer to Fig. 1, Fig. 1 is a kind of schematic diagram turning round hydraulic control system in prior art.
In Fig. 1, mainly comprise fix-displacement pump, with the proportional control valve of three-way pressure compensating device, independently cushion valve 11, proportional control valve is main reversing valve, cushion valve 11 i.e. by pass valve, one actuator port of cushion valve 11 is communicated with oil return line, another actuator port is in the first working connection 13 of high pressure by shuttle valve connection or is in the second working connection 14 of high pressure, the control port of cushion valve 11 is communicated with feedback oil circuit 12, when main reversing valve is positioned at left position or right position, and when being in static state, the pressure oil of feedback oil circuit 12 can enter the built-in pressure of spring cavity of cushion valve 11, the pressure oil of working connection can enter with spring in chamber, oil pressure in spring cavity and spring force can keep balancing to cavity pressure with spring, and spool is passed to make two actuator ports of cushion valve 11 remain open state, then the first working connection 13 and the second working connection 14 normally enter, oil return.In addition, the feedback oil circuit 12 be communicated with cushion valve 11 is provided with damping 15
Start moment, due to the existence of damping 15, cushion valve 11 spring cavity builds pressure time lag, namely spring cavity fails to set up high pressure at short notice, and spring is very fast to the pressure voltage built-up rate in chamber, high pressure person then between the first working connection 13 and the second working connection 14 can overcome spring pressure in cushion valve 11 and conducting cushion valve 11, and then is communicated with oil return line, to realize buffer action when starting.Until spring cavity pressure increase to time identical with load, namely at ordinary times at a stalemate to chamber oil pressure with spring, cushion valve 11 is closed again, returns to static state, then working connection normally works.
But there is following technical matters in technique scheme:
The first, the control port of cushion valve 11 is communicated with feedback oil circuit 12, the pressure of feedback oil circuit 12 can fluctuate with the fluctuation of load pressure, and when oscillation frequency is higher or amplitude is larger, cushion valve 11 cannot respond in time and cushion, system pressure can be caused to fluctuate, and external manifestation is shake;
Second, when handle returns meta (in Fig. 1, main reversing valve is positioned at meta), working connection at main reversing valve place by shutoff, because the factors such as outer structural parts and inertia such as arm can cause power element (as rotary motor in Fig. 1) to stop in time, but continue to compress the epitrochoidal chamber of rotary motor and pipeline under effect of inertia, namely the one-sided working connection meeting continuous high-pressure of high pressure is in, correspondingly feed back oil circuit 12 oil pressure also higher, then the spring cavity of cushion valve 11 is still in high pressure and closes, cannot discharge working connection pressure, the cycle of higher pressure between two working connections can be caused, until actuator movement stops, cause shake,
When three, stopping, damping 15 also can cause the pressure of cushion valve 11 spring cavity to discharge in time, causes shake.
In view of this, how enabling rotary system more steady when starting and stop, is those skilled in the art's technical matterss urgently to be resolved hurrily.
Summary of the invention
Core of the present invention, can be more steady when this hydraulic efficiency pressure system makes rotary system in startup and stops for providing a kind of revolution hydraulic control system and hoisting crane.
For solving the problems of the technologies described above, the invention provides a kind of revolution hydraulic control system, comprising guide's oil circuit, being controlled the hydraulic control main reversing valve of the working connection flow direction and break-make and cushion valve by described guide's oil circuit; Described cushion valve has the first actuator port, the second actuator port, and control the control port of described first actuator port, the second actuator port break-make, when described first actuator port and described second actuator port conducting, the high pressure section of described working connection is communicated with oil return line by described cushion valve, the described control port of described cushion valve is communicated with guide's oil circuit, and described control port to the path of described guide's oil circuit is provided with damping.
Preferably, the number of described cushion valve is two, described working connection comprises the first working connection between hydraulic control main reversing valve and power element and the second working connection, first actuator port of cushion valve described in two connects described first working connection and described second working connection respectively, and the second actuator port of cushion valve described in two is all communicated with oil return line; Described hydraulic control main reversing valve has two control ends, and control end described in two is communicated with guide's oil circuit described in two respectively, and the control port of cushion valve described in two is communicated with guide's oil circuit described in two respectively.
Preferably, described working connection comprises the first working connection between hydraulic control main reversing valve and power element and the second working connection, and described hydraulic control main reversing valve has two control ends, and control end described in two is communicated with guide's oil circuit described in two respectively; First actuator port of described cushion valve is communicated with the first working connection or the second working connection by the first shuttle valve, and the second actuator port of described cushion valve is communicated with oil return line, and the control port of described cushion valve is communicated with the one in guide's oil circuit described in two by the second shuttle valve.
Preferably, the described control port of described cushion valve is provided with check valve to the path of described guide's oil circuit, and described check valve and described damping are set up in parallel.
Preferably, described damping and described check valve are integrated in one.
Preferably, described hydraulic control main reversing valve is the type three-position four-way valve that surges.
In this invention, the control port of cushion valve is communicated with guide's oil circuit, pilot control is low pressure and stable oil sources, have nothing to do with load pressure, in background technology, cushion valve is communicated with the larger feedback oil circuit of fluctuation, in the present invention, cushion valve does not affect by the fluctuation of load, can respond in time and cushion, to make rotary system comparatively steady when starting and stop.And during rotary system stopping, guide's oil circuit Pressure Drop is low, although one-sided working connection pressure is still higher under effect of inertia, but the pressure in cushion valve spring cavity can pass through the successfully pressure release of guide's oil circuit, then the first actuator port of cushion valve and the second actuator port can keep conducting state, make the working connection of high pressure by the rapid pressure release of cushion valve, thus also can play good pooling feature when stopping.
The present invention also provides a kind of hoisting crane, and comprise the revolution hydraulic control system of power element and the described power element action of driving, described revolution hydraulic control system is the revolution hydraulic control system described in above-mentioned any one.
Preferably, described power element is rotary motor.
Because above-mentioned revolution hydraulic control system has above-mentioned technique effect, the hoisting crane with this revolution hydraulic control system also has identical technique effect.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram turning round hydraulic control system in prior art;
Fig. 2 is the schematic diagram of a kind of detailed description of the invention of revolution hydraulic control system provided by the present invention;
Fig. 3 is the schematic diagram of the another kind of detailed description of the invention of revolution hydraulic control system provided by the present invention.
In Fig. 1:
11 cushion valves, 12 feedback oil circuits, 13 first working connections, 14 second working connections, 15 dampings, P oil inlet, T return opening;
In Fig. 2-3:
21 cushion valves, 211 first actuator ports, 212 second actuator ports, 213 control ports, 221 dampings, 222 check valves, 23 rotary motors, 241 first working connections, 242 second working connections, 25 hydraulic control main reversing valves, 26 guide's oil circuits, 27 first shuttle valves, 28 second shuttle valves, P oil inlet, T return opening
Detailed description of the invention
Core of the present invention, can be more steady when this hydraulic efficiency pressure system makes rotary system in startup and stops for providing a kind of revolution hydraulic control system and hoisting crane.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of a kind of detailed description of the invention of revolution hydraulic control system provided by the present invention.
Revolution hydraulic control system in this embodiment, comprises guide's oil circuit 26, is controlled the hydraulic control main reversing valve 25 of the working connection flow direction and break-make by guide's oil circuit 26.As described in Figure 2, the spool of hydraulic control main reversing valve 25 moves to left or moves to right under guide oil road 26 acts on, thus switches the flow direction or the break-make of working connection between hydraulic control main reversing valve 25 and power element.Hydraulic control main reversing valve 25 in Fig. 2 is three-position four-way valve, it has two control ends, two control ends are communicated with two guide's oil circuits 26 respectively, when left side guide's oil circuit 26 pressure raises, be positioned at left position, when right side guide's oil circuit 26 pressure raises, be positioned at right position, when both sides guide's oil circuit 26 pressure all reduces, be positioned at meta.The revolution that three-position four-way valve is suitable for this kind of closed system controls needs, can expect that hydraulic control main reversing valve 25 also can be the six logical or pilot-operated type change-over valves of other types.
This revolution hydraulic control system also comprises cushion valve 21, cushion valve 21 i.e. by pass valve, there is the first actuator port 211, second actuator port 212, and control the first actuator port 211, the control port 213 of the second actuator port 212 break-make, as shown in Figure 2, control port 213 is communicated with spring cavity, spring is communicated with its first actuator port 211 to chamber, then high pressure oil is when control port 213 flows to spring cavity and builds pressure and maintain an equal level to chamber with spring, first actuator port 211 of cushion valve 21 and the second actuator port 212 disconnect, otherwise, first actuator port 211 and the second actuator port 212 conducting.When the first actuator port 211 and the second actuator port 212 conducting, the high pressure section of working connection can be communicated with oil return line by cushion valve 21.In Fig. 2, working connection comprises the first working connection 241 and the second working connection 242 between rotary motor 23 and hydraulic control main reversing valve 25, when first working connection 241 is high-pressure oil passage, the high pressure section of working connection is the first working connection 241, when second working connection 242 switches to high-pressure oil passage, the high pressure section of working connection is the second working connection 242.Namely no matter the first working connection 241 is in high pressure or the second working connection 242 is in high pressure, and the working connection being in high pressure all can be communicated with oil return line by cushion valve 21.
In addition, in the present embodiment, the control port 213 of cushion valve 21 is communicated with guide's oil circuit 26.And the path of control port 213 to guide oil circuit 26 is provided with damping 221, similar with the principles illustrated of background technology, the setting of damping 221 is intended to realize cushion valve 21 spring cavity and builds and be pressed in temporal sluggishness, thus reaches instantaneous conducting cushion valve 21 and play buffer action.
Because in this embodiment, the control port 213 of cushion valve 21 is communicated with guide's oil circuit 26, guide's oil circuit 26 is low pressure and stable oil sources, have nothing to do with load pressure, as can be seen from Figure 2, guide's oil circuit 26 is mainly used for the spool of promotion hydraulic control main reversing valve 25 to realize commutation.In background technology, cushion valve 21 is communicated with the larger feedback oil circuit of fluctuation, the control port 213 of this cushion valve 21 is communicated with stable guide's oil circuit 26, then in this embodiment, cushion valve 21 does not affect by the fluctuation of load, can respond in time and cushion, to make rotary system comparatively steady when starting and stop.And during rotary system stopping, when in such as Fig. 2, hydraulic control main reversing valve 25 is in meta, guide's oil circuit 26 pressure reduces, although one-sided working connection pressure is still higher under effect of inertia, but the pressure in cushion valve 21 spring cavity can pass through guide's oil circuit 26 successfully pressure release, then the first actuator port 211 of cushion valve 21 and the second actuator port 212 can keep conducting state, make to keep due to inertia the working connection of high pressure by cushion valve 21 pressure release rapidly, thus also can play good pooling feature when stopping.
Further, in this embodiment, the number of cushion valve 21 is two, and as shown in Figure 2, the first actuator port 211 of two cushion valves 21 connects the first working connection 241 and the second working connection 242 respectively, and the second actuator port 212 of two cushion valves 21 is all communicated with oil return line.Then the first working connection 241 is high-pressure oil passage, and when the second working connection 242 is low pressure oil way, the first working connection 241 can be cushioned by the cushion valve 21 in left side, and during commutation, the second working connection 242 as high-pressure oil passage can be cushioned by the cushion valve 21 on right side.Correspondingly, the control port 213 of two cushion valves 21 is communicated with two guide's oil circuits 26 of both sides respectively.Certainly in order to ensure that cushion valve 21 can realize pooling feature; guide's oil circuit 26 that the working connection that cushion valve 21 first actuator port 211 connects is communicated with its control port 213 is positioned at the same side; when namely guaranteeing that cushion valve 21 is communicated with the working connection of high pressure, its control port 213 is communicated with guide's oil circuit 26 that pressure raises.
In above-described embodiment, each working connection between hydraulic control main reversing valve 25 to power element realizes buffering by independent cushion valve 21, avoids the interference in crank motion.And when rotary motor 23 rotates and reverse, general pressure at both sides requires different.Such as, in Fig. 2, when first working connection 241 and the second working connection 242 are in high pressure respectively, high-pressure demand may be different, and the buffering of cushion valve 21 depends on that spring cavity pressure and spring are to cavity pressure (corresponding working connection pressure), after arranging two cushion valves 21, each cushion valve 21 can regulate according to the working connection pressure of correspondence, adds the adjustability of pooling feature.
When two cushion valves 21 is set, the path of control port 213 to the guide oil circuit 26 of cushion valve 21 can arrange check valve 222, check valve 222 and damping 221 are set up in parallel, namely control port 213 and guide's oil circuit 26 have two paths, as shown in Figure 2, the hydraulic oil of guide's oil circuit 26 can through damping 221 traffic organising hydraulic fluid port 213, and in cushion valve 21 spring cavity, hydraulic oil can flow back to guide's oil circuit 26 from control port 213 through check valve 222.After arranging check valve 222, when rotary system stops, the hydraulic oil in spring cavity can be back to rapidly guide's oil circuit 26 pressure release through check valve 222, instead of through damping 221 slowly pressure release, improves the buffering effect stopping moment further.The damping 221 arranged and check valve 222 can be integrated in one, and form one-way damper valve, are convenient to install and simplify piping layout.
Adopt two cushion valves 21 in above-described embodiment, create technique effect as above, and realize stable buffering and two cushion valves 21 are not set also are fine.Please refer to Fig. 3, Fig. 3 is the schematic diagram of the another kind of detailed description of the invention of revolution hydraulic control system provided by the present invention.This embodiment only arranges a cushion valve 21.
Equally, working connection comprises the first working connection 241 and the second working connection 242 between hydraulic control main reversing valve 25 and rotary motor 23, and hydraulic control main reversing valve 25 has two control ends, and two control ends are communicated with two guide's oil circuits 26 respectively.First actuator port 211 of cushion valve 21 is communicated with the first working connection 241 or the second working connection 242 by the first shuttle valve 27, namely during the first working connection 241 high pressure, when being communicated with first working connection the 241, second working connection 242 high pressure, is communicated with the second working connection 242.In addition, the second actuator port 212 of cushion valve 21 is communicated with oil return line, and the control port 213 of cushion valve 21 is communicated with the one in two guide's oil circuits 26 by the second shuttle valve 28.
Consistent with above-described embodiment principle, in order to realize pooling feature, when the first actuator port 211 of cushion valve 21 is communicated with the high-pressure main oil path of side, guide's oil circuit 26 that the pressure that its control port 213 is communicated with homonymy raises.The control port 213 of cushion valve 21 is communicated with guide's oil circuit 26 by this embodiment equally, make the startup of rotary system and stop all can effectively being cushioned, reduce and impact, and a cushion valve 21 also can simplify hydraulic tubing layout, certainly, compared to above-described embodiment, in this embodiment, the adjustability of cushion valve buffering is taken second place.
When a cushion valve 21 is only set, also damping 222 arranged side by side and check valve 221 can be set on cushion valve 21 control port 213 to guide oil circuit 26.As shown in Figure 3, the hydraulic oil of left side guide's oil circuit 26 after the spring cavity that left side damping 222 enters cushion valve 21, conducting on the left of the second shuttle valve 28, then spring cavity can by oil circuit oil return pressure release on the left of the second shuttle valve 28; Right side guide's oil circuit 26 hydraulic oil enters after cushion valve 21 spring cavity through right side damping 222, conducting on the right side of second shuttle valve 28, spring cavity can pass through right side oil circuit oil return pressure release, and in this embodiment, arranging of check valve 221 can reach the technique effect same with above-described embodiment as seen.In addition, same as the previously described embodiments, damping 222 and check valve 221 can be integrated in one formation one-way damper valve.
It should be noted that, for the various embodiments described above, answer the ratio of the area (acting on spring cavity) of guide's oil circuit effect on appropriate design cushion valve 21 and the area (acting on spring to chamber) of load oil sources effect, this ratio is crossed conference and is caused buffering effect bad, and pressure excess gradient is larger; When the too small meeting of ratio causes heavy duty speed of revolutions not and cal val increase, affect work efficiency.
The present invention also provides a kind of hoisting crane, and comprise the revolution hydraulic control system of power element and the action of driving power element, described revolution hydraulic control system is the revolution hydraulic control system described in above-mentioned any embodiment.Because above-mentioned revolution hydraulic control system has above-mentioned technique effect, the hoisting crane with this revolution hydraulic control system also has identical technique effect, repeats no more herein.Power element can be specifically rotary motor 23, as shown in Figure 2,3.
Above to one provided by the present invention state revolution hydraulic control system and hoisting crane be all described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.

Claims (8)

1. turn round a hydraulic control system, comprise guide's oil circuit (26), controlled the hydraulic control main reversing valve (25) of the working connection flow direction and break-make and cushion valve (21) by described guide's oil circuit (26), described cushion valve (21) has the first actuator port (211), second actuator port (212), and control described first actuator port (211), the control port (213) of the second actuator port (212) break-make, when described first actuator port (211) and described second actuator port (212) conducting, the high pressure section of described working connection is communicated with oil return line by described cushion valve (21), it is characterized in that, the described control port (213) of described cushion valve (21) is communicated with guide's oil circuit (26), and described control port (213) to the path of described guide's oil circuit (26) is provided with damping (222).
2. revolution hydraulic control system as claimed in claim 1, it is characterized in that, the number of described cushion valve (21) is two, described working connection comprises and is positioned at the first working connection (241) between hydraulic control main reversing valve (25) and power element and the second working connection (242), first actuator port (211) of cushion valve described in two (21) connects described first working connection (241) and described second working connection (242) respectively, and second actuator port (212) of cushion valve described in two (21) is all communicated with oil return line; Described hydraulic control main reversing valve (25) has two control ends, control end described in two is communicated with guide's oil circuit (26) described in two respectively, and the control port (213) of cushion valve described in two (21) is communicated with guide's oil circuit (26) described in two respectively.
3. revolution hydraulic control system as claimed in claim 1, it is characterized in that, described working connection comprises and is positioned at the first working connection (241) between hydraulic control main reversing valve (25) and power element and the second working connection (242), described hydraulic control main reversing valve (25) has two control ends, and control end described in two is communicated with guide's oil circuit (26) described in two respectively; First actuator port (211) of described cushion valve (21) is communicated with the first working connection (241) or the second working connection (242) by the first shuttle valve (27), second actuator port (212) of described cushion valve (21) is communicated with oil return line, and the control port (213) of described cushion valve (21) is communicated with the one of (26) in guide's oil circuit described in two by the second shuttle valve (28).
4. the revolution hydraulic control system as described in any one of claim 1-3, it is characterized in that, the described control port (213) of described cushion valve (21) is provided with check valve (221) to the path of described guide's oil circuit (26), and described check valve (221) and described damping (222) are set up in parallel.
5. revolution hydraulic control system as claimed in claim 4, it is characterized in that, described damping (222) and described check valve (221) are integrated in one.
6. the revolution hydraulic control system as described in any one of claim 1-3, is characterized in that, described hydraulic control main reversing valve (25) is the type three-position four-way valve that surges.
7. a hoisting crane, comprise the revolution hydraulic control system of power element and the described power element action of driving, it is characterized in that, described revolution hydraulic control system is the revolution hydraulic control system described in any one of claim 1-6.
8. hoisting crane as claimed in claim 7, it is characterized in that, described power element is rotary motor (23).
CN201210527907.4A 2012-12-10 2012-12-10 Rotary control hydraulic system and crane Active CN103010980B (en)

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CN103470565B (en) * 2013-09-24 2015-09-16 徐州重型机械有限公司 The rotary system of rotary buffering valve and hoist
CN103727076B (en) * 2013-11-19 2016-04-27 徐州重型机械有限公司 A kind of hydraulic control rotation control device and crane rotation system
EP3114071B1 (en) 2014-03-04 2019-05-08 Manitowoc Crane Companies, LLC Electronically controlled hydraulic swing system
CN104912136B (en) * 2015-05-28 2018-11-16 潍柴动力股份有限公司 A kind of excavator and its Hydraulic slewing system
CN105443469B (en) * 2015-12-21 2017-07-04 山河智能装备股份有限公司 engineering machinery speed hydraulic control device
CN106629396B (en) * 2016-12-23 2018-05-18 徐州重型机械有限公司 A kind of crane electro-hydraulic joint speed governing rotary system and control method
CN107152429B (en) * 2017-06-26 2018-09-07 常德中联重科液压有限公司 Engineering machinery, hydraulic control circuit and valve terminal

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