CN102155447A - Rotating hydraulic system of crane and rotating buffer valve thereof - Google Patents
Rotating hydraulic system of crane and rotating buffer valve thereof Download PDFInfo
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- CN102155447A CN102155447A CN2011100618053A CN201110061805A CN102155447A CN 102155447 A CN102155447 A CN 102155447A CN 2011100618053 A CN2011100618053 A CN 2011100618053A CN 201110061805 A CN201110061805 A CN 201110061805A CN 102155447 A CN102155447 A CN 102155447A
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Abstract
The invention discloses a rotating buffer valve which comprises a first back pressure valve, a second back pressure valve and a buffer reversing valve, at the moment of the start and stop of the rotation, hydraulic oil only can enter a rotating motor through a passageway which is provided with the back pressure valve, and then flows to an oil tank; and when in a steady rotating process, the hydraulic oil enters the rotating motor from the buffer reversing valve, then flows back the buffer reversing valve from the rotating motor, and further flows back an oil back tank. At the moment of the start and stop of the rotation, the hydraulic oil only can flow from the first back pressure valve and the second back pressure valve, thus the flow rate and pressure of the hydraulic oil can be controlled effectively, instant system high pressure caused by the instant start and stop of the rotation can be eliminated, the stability of rotation can be improved, and the aim of buffer can be achieved; and during the rotating process, the hydraulic oil can directly enter the rotating motor to work from the buffer reversing valve, thus the rotating efficiency can be improved. The invention also provides a rotating hydraulic system of a crane of the rotating buffer valve.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of rotary buffering valve.The invention still further relates to a kind of crane rotation hydraulic system that comprises above-mentioned rotary buffering valve.
Background technique
Along with the continuous development of construction machinery industry, the car load lifting weight and the lifting altitude of hoist increase gradually, and performance promotes gradually.
With the wheeled crane is example, wheeled crane for big tonnage, its arm is long, weight is big, and when then car load turned round, the revolution moment of inertia was bigger, cause turnability relatively poor, if take the revolution of enclosed pump control hydraulic system control car load, the then fine motion of this system, travelling comfort are better, but cost is higher, especially at medium tonnage wheeled crane, adopt the enclosed rotary system significantly to increase production cost.
Please refer to Fig. 1, Fig. 1 is a kind of hydraulic diagram of typical rotary buffering valve.
In the prior art, the common open type Hydraulic slewing system of main employing, promptly adopt common gear pump to add the revolution trimmer valve, as shown in Figure 1, this rotary buffering valve is made up of four one-way valves and a leading type electricity proportional pressure-reducing valve 50, valve body the 3rd hydraulic fluid port C3 and the 4th hydraulic fluid port C4 are communicated with two hydraulic fluid ports of rotary motor D respectively, during the revolution of car load forward, the first hydraulic fluid port C1 of valve body is connected with fuel tank with the oil outlet of rotary pump respectively with the second hydraulic fluid port C2, during the car load reversed turning, the first hydraulic fluid port C1 of valve body is connected with the oil outlet of fuel tank and rotary pump respectively with the second hydraulic fluid port C2.The pilot port of leading type electricity proportional pressure-reducing valve 50 is obtained guide oil from valve inner, openings of sizes according to valve inner pressure control main valve, during revolution, system pressure is too high, then partial pressure oil can be via first one-way valve 10 or second one-way valve 20, and leading type electricity proportional pressure-reducing valve 50 flows back to fuel tank, thereby plays rotating buffer function.The 3rd one-way valve 30 and the 4th one-way valve 40 below the rotary buffering valve have the repairing function when revolution stops.
This rotary buffering valve is made of one-way valve and electric proportional pressure-reducing valve 50, and the stability that starts and stop moment in revolution is not enough, and especially at the hoist of big tonnage, because the revolution moment of inertia is bigger, this rotary buffering valve can't satisfy the stationarity of rotary system.
Therefore, how improving a kind of rotary buffering valve with higher stability is those skilled in the art's technical issues that need to address.
Summary of the invention
The purpose of this invention is to provide a kind of rotary buffering valve, this rotary buffering valve makes revolution have stability preferably, and can improve revolution efficient.Another object of the present invention provides a kind of crane rotation hydraulic system that comprises above-mentioned rotary buffering valve.
For solving the problems of the technologies described above, the invention provides a kind of rotary buffering valve, have first hydraulic fluid port, second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port on its valve body, and be provided with in its valve body:
The buffering selector valve, in first working position, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port and the 4th hydraulic fluid port conducting, in second working position, its first hydraulic fluid port, second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port all disconnect; First hydraulic fluid port of described buffering selector valve and second hydraulic fluid port are communicated with first hydraulic fluid port and second hydraulic fluid port of described valve body respectively; The 3rd hydraulic fluid port of described buffering selector valve and the 4th hydraulic fluid port are communicated with the 3rd hydraulic fluid port and the 4th hydraulic fluid port of described valve body respectively;
First back pressure valve and second back pressure valve, described first back pressure valve and described buffering selector valve are parallel on the path of first hydraulic fluid port of described valve body and described the 3rd hydraulic fluid port, and described second back pressure valve and described buffering selector valve are parallel on the path of second hydraulic fluid port of described valve body and the 4th hydraulic fluid port.
Preferably, the first electric proportional pressure-reducing valve and the second electric proportional pressure-reducing valve also are set in the described valve body, described first back pressure valve and described second back pressure valve are the hydraulic control throttle valve, and the pilot port of described first back pressure valve and described second back pressure valve is communicated with the oil outlet of the described first electric proportional pressure-reducing valve and the described second electric proportional pressure-reducing valve respectively.
Preferably, the 3rd electric proportional pressure-reducing valve is set also in the described valve body, described buffering selector valve is a pilot operated directional control valve, and the pilot port of described buffering selector valve is communicated with the oil outlet of described the 3rd electric proportional pressure-reducing valve.
Preferably, slewing directional control valve also is set in the described valve body, in first working position, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port and the 4th hydraulic fluid port conducting, in second working position, its first hydraulic fluid port and the 4th hydraulic fluid port conducting, second hydraulic fluid port and the 3rd hydraulic fluid port conducting; First hydraulic fluid port of described slewing directional control valve and second hydraulic fluid port are communicated with first hydraulic fluid port and second hydraulic fluid port of described valve body respectively, first hydraulic fluid port of the 3rd hydraulic fluid port of described slewing directional control valve and described first back pressure valve and described buffering selector valve is communicated with, and second hydraulic fluid port of the 4th hydraulic fluid port of described slewing directional control valve and described second back pressure valve and described buffering selector valve is communicated with.
Preferably, described slewing directional control valve is in the 3rd working position, and its first hydraulic fluid port and second hydraulic fluid port all are communicated with second hydraulic fluid port of described valve body, and described second hydraulic fluid port is a return opening.
Preferably, the 4th electric proportional pressure-reducing valve and the 5th electric proportional pressure-reducing valve also are set in the described valve body, described slewing directional control valve is a pilot operated directional control valve, and two pilot port of described slewing directional control valve are communicated with the oil outlet of the described the 4th electric proportional pressure-reducing valve and described the 5th electric proportional pressure-reducing valve respectively.
Preferably, described valve body also has control port, and the filler opening of the described first electric proportional pressure-reducing valve, the described second electric proportional pressure-reducing valve, the described the 3rd electric proportional pressure-reducing valve, the described the 4th electric proportional pressure-reducing valve and described the 5th electric proportional pressure-reducing valve all is communicated with described control port.
Preferably, be equipped with the resistance of first liquid on the path of the oil outlet of the described the 4th electric proportional pressure-reducing valve and described the 5th electric proportional pressure-reducing valve and described slewing directional control valve pilot port.
Preferably, relief valve is set also in the described valve body, the filler opening of described relief valve and oil outlet are communicated with the 3rd hydraulic fluid port and the 4th hydraulic fluid port of described valve body respectively.
Preferably, the precursor overflow valve of main relief valve and the described main relief valve pilot pressure of control is set also in the described valve body, the filler opening of described main relief valve and oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of described valve body respectively.
Preferably, be provided with the resistance of second liquid between the filler opening of the filler opening of described main relief valve and described precursor overflow valve.
Preferably, the feedback oil circuit of the 3rd hydraulic fluid port to the four hydraulic fluid ports of described valve body is provided with the resistance of the 3rd liquid.
Rotary buffering valve provided by the present invention comprises first back pressure valve, second back pressure valve and buffering selector valve, start moment in revolution, make the buffering selector valve be in first working position, hydraulic oil only can enter rotary motor by the path that is provided with first back pressure valve, from rotary motor second back pressure valve of flowing through, flow to fuel tank more again; When being in the stable turning course, make the buffering selector valve be in second working position, the conducting of buffering selector valve, because there is preset pressure in first back pressure valve, then hydraulic oil is selected to flow back to the buffering selector valve from rotary motor again, and then to flow back to fuel tank from cushioning the selector valve rotary motor of flowing through; When revolution stops, making the buffering selector valve be in first working position once more, identical when the loop of hydraulic oil starts with revolution.During reversed turning, reversed turning starts to turning round in the stopped process hydraulic oil fundamental circuit and the rotating process of above-mentioned forward just the opposite.Then this changes the commentaries on classics trimmer valve and is turning round the moment that startup and revolution stop, hydraulic oil only can pass through from first back pressure valve and second back pressure valve, thereby can control the flow and the pressure of hydraulic oil effectively, eliminate revolution startup and revolution and stop the instantaneous system high pressure that moment causes, promote rotating stability, reach the purpose of buffering; And in rotating process, hydraulic oil can directly enter rotary motor work from cushioning selector valve, thereby improves revolution efficient.
The present invention also provides a kind of crane rotation hydraulic system, comprises rotary pump, rotary motor and rotary buffering valve, and described rotary buffering valve is above-mentioned each described rotary buffering valve.
Because above-mentioned rotary buffering valve has above-mentioned technique effect, the crane rotation hydraulic system with above-mentioned rotary buffering valve also has identical technique effect.
Description of drawings
Fig. 1 is a kind of hydraulic diagram of typical rotary buffering valve;
Fig. 2 is the hydraulic diagram of a kind of embodiment of rotary buffering valve provided by the present invention;
Fig. 3 is the hydraulic diagram of the another kind of embodiment of rotary buffering valve provided by the present invention.
Embodiment
Core of the present invention provides a kind of rotary buffering valve, and this rotary buffering valve makes revolution have stability preferably, and can improve revolution efficient.Another core of the present invention provides a kind of crane rotation hydraulic system that comprises above-mentioned rotary buffering valve.
In order to make those skilled in the art understand technological scheme of the present invention better, 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 diagram of a kind of embodiment of rotary buffering valve provided by the present invention.
Have the first hydraulic fluid port B1, the second hydraulic fluid port A1, the 3rd hydraulic fluid port A and the 4th hydraulic fluid port B on the valve body of the rotary buffering valve in this embodiment, the 3rd hydraulic fluid port A and the 4th hydraulic fluid port B are communicated with the hydraulic fluid port of revolution executive component, and the 3rd hydraulic fluid port A shown in Fig. 2 and the 4th hydraulic fluid port B are communicated with the both sides hydraulic fluid port of executive component rotary motor 15; Also be provided with buffering selector valve 3, first back pressure valve 1 and second back pressure valve 2 in the valve body.
First back pressure valve 1 and second back pressure valve 2, first back pressure valve 1 and buffering selector valve 3 are parallel on the path of the first hydraulic fluid port B1 of valve body and the 3rd hydraulic fluid port A, second back pressure valve 2 and buffering selector valve 3 are parallel on the path of the 3rd hydraulic fluid port A of valve body and the 4th hydraulic fluid port B, be that valve body first hydraulic fluid port B1 and the 3rd hydraulic fluid port A, second hydraulic fluid port and the 4th hydraulic fluid port B both can be communicated with by buffering selector valve 3, also can be communicated with by the path that back pressure valve is set.
During the forward revolution, start moment in revolution, the hydraulic oil of rotary motive power element enters from the first hydraulic fluid port B1 of valve body, make buffering selector valve 3 be in first working position, promptly be in the position, a left side shown in Fig. 2, because position, a left side is obstructed, hydraulic oil can't cushion selector valve 3 certainly and flow out, only can enter the left side hydraulic fluid port (is the visual angle with Fig. 2) of rotary motor 15 by the path that is provided with first back pressure valve 1, flow out from the right side of rotary motor 15 hydraulic fluid port again, behind second back pressure valve 2 of flowing through, flow to the second hydraulic fluid port A1 of valve body again, this moment, the second hydraulic fluid port A1 of valve body was a return opening, and the first hydraulic fluid port B1 is a filler opening; When being in the stable turning course, make buffering selector valve 3 be in second working position, promptly be in the right position shown in Fig. 2,3 conductings of buffering selector valve, because there is preset pressure in first back pressure valve 1, then hydraulic oil is selected to flow back to buffering selector valve 3 from the right side of rotary motor 15 hydraulic fluid port again, and then to flow out the second hydraulic fluid port A1 as the valve body of return opening from cushioning the flow through left side hydraulic fluid port of rotary motor 15 of selector valve 3; When revolution stops, making buffering selector valve 3 be in first working position once more, identical when the loop of hydraulic oil starts with revolution, do not give unnecessary details at this.During reversed turning, hydraulic oil enters from the second hydraulic fluid port A1 of valve body, and the first hydraulic fluid port B1 of valve body is as return opening, and reversed turning starts to turning round in the stopped process hydraulic oil fundamental circuit and the rotating process of above-mentioned forward just the opposite, can be with reference to understanding.
This changes the commentaries on classics trimmer valve and is turning round the moment that startup and revolution stop, hydraulic oil only can pass through from first back pressure valve 1 and second back pressure valve 2, thereby can control the flow and the pressure of hydraulic oil effectively, eliminate revolution startup and revolution and stop the instantaneous system high pressure that moment causes, promote rotating stability, reach the purpose of buffering; And in rotating process, hydraulic oil can directly enter rotary motor 15 work from cushioning selector valve 3, thereby improves revolution efficient.
The first electric proportional pressure-reducing valve 4 and the second electric proportional pressure-reducing valve 5 can also be set in the valve body, first back pressure valve 1 and second back pressure valve 2 are the hydraulic control throttle valve, throttle valve can effectively be controlled hydraulic fluid flow rate and produce back pressure to system, and the pilot port of first back pressure valve 1 and second back pressure valve 2 is communicated with the oil outlet of the first electric proportional pressure-reducing valve 4 and the second electric proportional pressure-reducing valve 5 respectively.The electricity proportional pressure-reducing valve can provide the constant working pressure of adjustable size continuously, pari passu according to the electrical signal of input, thereby can accurately control the valve port opening degree of two back pressure valves according to actual needs, satisfies the fine motion requirement of operation.
The 3rd electric proportional pressure-reducing valve 6 then also can be set in the valve body, and buffering selector valve 3 adopts pilot operated directional control valve, and the pilot port that cushions selector valve 3 is communicated with the oil outlet of the 3rd electric proportional pressure-reducing valve 6, can improve the fine motion of operation equally.
Please refer to Fig. 3, Fig. 3 is the hydraulic diagram of the another kind of embodiment of rotary buffering valve provided by the present invention.
In this embodiment, slewing directional control valve 11 can be set in valve body, being about to slewing directional control valve 11 is integrated in the rotary buffering valve valve body, slewing directional control valve 11 has at least two working positions, in first working position, and its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port and the 4th hydraulic fluid port conducting, position, a left side as shown in Figure 3, in second working position, its first hydraulic fluid port and the 4th hydraulic fluid port conducting, second hydraulic fluid port and the 3rd hydraulic fluid port conducting, right position as shown in Figure 3; First hydraulic fluid port of slewing directional control valve 11 and second hydraulic fluid port are communicated with the first hydraulic fluid port B1 and the second hydraulic fluid port A1 of valve body respectively, because the revolution commutation function realizes that in the valve body of rotary buffering valve the first hydraulic fluid port B1 and the second hydraulic fluid port A1 of valve body are respectively filler opening and return opening; First hydraulic fluid port of the 3rd hydraulic fluid port of slewing directional control valve 11 and first back pressure valve 1 and buffering selector valve 3 is communicated with, second hydraulic fluid port of the 4th hydraulic fluid port of slewing directional control valve 11 and second back pressure valve 2 and buffering selector valve 3 is communicated with, and promptly two back pressure valves and buffering selector valve 3 are all by slewing directional control valve 11 oil-feeds or oil return.Slewing directional control valve 11 is in left side position promptly during first working position, hydraulic oil is through first back pressure valve 1 or cushion the left side hydraulic fluid port that selector valve 3 enters rotary motor 15, is back to fuel tank through the right side of rotary motor 15 hydraulic fluid port, second back pressure valve 2 or buffering selector valve 3, slewing directional control valve 11 again; Slewing directional control valve 11 is in right position promptly during second working position, and hydraulic oil flows into the left side hydraulic fluid port from the right side of rotary motor 15 hydraulic fluid port, realizes the change of gyratory directions.Hydraulic oil is same as the previously described embodiments through the control of back pressure valve or buffering selector valve 3, does not give unnecessary details at this.
Can adopt three slewing directional control valve 11, be that slewing directional control valve 11 also has the 3rd working position, in the 3rd working position, its first hydraulic fluid port and second hydraulic fluid port all are communicated with the second hydraulic fluid port A1 as the valve body of return opening, as shown in Figure 3, when slewing directional control valve 11 was in meta, its first hydraulic fluid port and second hydraulic fluid port all were communicated with the second hydraulic fluid port A1 of valve body.When revolution stops, when rotary motor 15 quits work, make 11 times metas of slewing directional control valve under the break effect, the hydraulic oil of system can be back to fuel tank from return opening, thus the impact when reducing rotary braking further improves the stability of revolution control.
Similar with buffering selector valve 3, the 4th electric proportional pressure-reducing valve 12 and the 5th electric proportional pressure-reducing valve 13 can also be set in the valve body, slewing directional control valve 11 adopts pilot operated directional control valve, two pilot port about three slewing directional control valve 11 has, two pilot port are communicated with the oil outlet of the 4th electric proportional pressure-reducing valve 12 and the 5th electric proportional pressure-reducing valve 13 respectively, when two equal no signals of electric proportional pressure-reducing valve are imported, 11 times metas of slewing directional control valve.By the commutation of electric proportional pressure-reducing valve control slewing directional control valve 11, improve the fine motion of revolution operation.The 4th electric proportional pressure-reducing valve 12 and the 5th electric proportional pressure-reducing valve 13 can be taked push button, so that manual control electricity proportional pressure-reducing valve in case of emergency.
The related electric proportional pressure-reducing valve of above embodiment all can change certainly in the valve body that changes trimmer valve and obtain guide's oil sources.Preferably, rotary buffering valve can also have control port X, the filler opening of first electric proportional pressure-reducing valve 4, second electric proportional pressure-reducing valve the 5, the 3rd electric proportional pressure-reducing valve the 6, the 4th electric proportional pressure-reducing valve 12 and the 5th electric proportional pressure-reducing valve 13 all is communicated with control port X, control port X connects the external control oil sources, can carry out fuel feeding by independent external oil pump.The external control oil sources is not influenced by system fluctuation, and the control that provides than own pressure oil in the valve body has more superiority and flexibility, makes the control signal of electric proportional pressure-reducing valve more controlled, and the fine motion during crack mouthful of operation is better.Because there is internal leakage inevitably in hydrovalve, on the valve body drain tap Y can also be set, carry out draining for the electric proportional pressure-reducing valve among the above-mentioned embodiment, the drain tap of each electric proportional pressure-reducing valve all is communicated with the drain tap Y of valve body as shown in Figure 3.
The liquid resistance can all be set on the path of the oil outlet of the 4th electric proportional pressure-reducing valve 12 and the 5th electric proportional pressure-reducing valve 13 and slewing directional control valve 11 pilot port.As shown in Figure 3, control oil is through the 5th electric proportional pressure-reducing valve 13 and first liquid resistance, 14 pilot port that enter slewing directional control valve 11, and then first liquid resistance 14 can make slewing directional control valve 11 obtain better pilot pressure oil of stability.
In valve body relief valve 16 can also be set, the filler opening of relief valve 16 and oil outlet are communicated with the 3rd hydraulic fluid port A and the 4th hydraulic fluid port B of valve body respectively.Because the hydraulic oil flow direction when positive and negative revolution in the rotary buffering valve is opposite, therefore, as shown in Figure 3, relief valve 16 is made up of first relief valve and second relief valve that are set up in parallel and the overflow direction is opposite, when hydraulic oil when first back pressure valve 1 flow to the 3rd hydraulic fluid port A, if hydraulic fluid pressure is still too high, unnecessary hydraulic oil can overflow back fuel tank by first relief valve of bottom, equally, when hydraulic oil flow to the 4th hydraulic fluid port B through second back pressure valve 2, unnecessary hydraulic oil can overflow back fuel tank by second relief valve on top, prevents system overload.
The precursor overflow valve 8 of main relief valve 7 and main relief valve 7 pilot pressures of control can also be set in the valve body, and the filler opening of main relief valve 7 and oil outlet are communicated with the first hydraulic fluid port B1 and the second hydraulic fluid port A1 of valve body respectively.As shown in Figure 3, main relief valve 7 can adopt the three-way pressure compensating device, and promptly constant difference overflow valve when hydraulic oil enters low pressurized overflow behind the three-way pressure compensating device from the first hydraulic fluid port B1 (being filler opening this moment), plays a protective role to system.In addition, second liquid resistance, 10, the second liquid resistance 10 can be set between the filler opening of the filler opening of main relief valve 7 and precursor overflow valve 8 can play stabilization preferably, make the wave properties of load feedback pressure obtain good filtering the three-way pressure compensating device.
The 3rd liquid resistance 9 also can be set on the feedback oil circuit of the 3rd hydraulic fluid port A to the four hydraulic fluid port B of valve body.As shown in Figure 3, the 3rd liquid resistance 9 can be carried out filtering with the high pressure oil that enters rotary motor 15, eliminates pressure surge, and the stability in the whole process of revolution is further promoted.
Except above-mentioned rotary buffering valve, the present invention also provides a kind of crane rotation hydraulic system, comprise rotary pump, rotary motor and rotary buffering valve, described rotary buffering valve is the described rotary buffering valve of above-mentioned arbitrary embodiment, and the 3rd hydraulic fluid port of rotary buffering valve and the 4th hydraulic fluid port are communicated with the both sides hydraulic fluid port of rotary motor respectively.Because the rotary buffering valve in the foregoing description has above-mentioned technique effect, the crane rotation hydraulic system with above-mentioned rotary buffering valve also should have identical technique effect, does not give unnecessary details at this.
More than a kind of crane rotation hydraulic system provided by the present invention and rotary buffering valve thereof are described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.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 (13)
1. a rotary buffering valve is characterized in that, has first hydraulic fluid port (B1), second hydraulic fluid port (A1), the 3rd hydraulic fluid port (A) and the 4th hydraulic fluid port (B) on its valve body, and is provided with in its valve body:
Buffering selector valve (3), in first working position, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port and the 4th hydraulic fluid port conducting, in second working position, its first hydraulic fluid port, second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port all disconnect; First hydraulic fluid port of described buffering selector valve (3) and second hydraulic fluid port are communicated with first hydraulic fluid port (B1) and second hydraulic fluid port (A1) of described valve body respectively; The 3rd hydraulic fluid port of described buffering selector valve (3) and the 4th hydraulic fluid port are communicated with the 3rd hydraulic fluid port (A) and the 4th hydraulic fluid port (B) of described valve body respectively;
First back pressure valve (1) and second back pressure valve (2), described first back pressure valve (1) and described buffering selector valve (3) are parallel on the path of first hydraulic fluid port (B1) of described valve body and described the 3rd hydraulic fluid port (A), and described second back pressure valve (2) and described buffering selector valve (3) are parallel on the path of second hydraulic fluid port (A1) of described valve body and the 4th hydraulic fluid port (B).
2. rotary buffering valve according to claim 1, it is characterized in that, the first electric proportional pressure-reducing valve (4) and the second electric proportional pressure-reducing valve (5) also are set in the described valve body, described first back pressure valve (1) and described second back pressure valve (2) are the hydraulic control throttle valve, and the pilot port of described first back pressure valve (1) and described second back pressure valve (2) is communicated with the oil outlet of the described first electric proportional pressure-reducing valve (4) and the described second electric proportional pressure-reducing valve (5) respectively.
3. rotary buffering valve according to claim 2, it is characterized in that, the 3rd electric proportional pressure-reducing valve (6) also is set in the described valve body, and described buffering selector valve (3) is a pilot operated directional control valve, and the pilot port of described buffering selector valve (3) is communicated with the oil outlet of the described the 3rd electric proportional pressure-reducing valve (6).
4. according to each described rotary buffering valve of claim 1 to 3, it is characterized in that, slewing directional control valve (11) also is set in the described valve body, in first working position, its first hydraulic fluid port and the 3rd hydraulic fluid port conducting, second hydraulic fluid port and the 4th hydraulic fluid port conducting, in second working position, its first hydraulic fluid port and the 4th hydraulic fluid port conducting, second hydraulic fluid port and the 3rd hydraulic fluid port conducting; First hydraulic fluid port of described slewing directional control valve (11) and second hydraulic fluid port are communicated with first hydraulic fluid port (B1) and second hydraulic fluid port (A1) of described valve body respectively, first hydraulic fluid port of the 3rd hydraulic fluid port of described slewing directional control valve (11) and described first back pressure valve (1) and described buffering selector valve (3) is communicated with, and second hydraulic fluid port of the 4th hydraulic fluid port of described slewing directional control valve (11) and described second back pressure valve (2) and described buffering selector valve (3) is communicated with.
5. rotary buffering valve according to claim 4 is characterized in that, described slewing directional control valve (11) is in the 3rd working position, and its first hydraulic fluid port and second hydraulic fluid port all are communicated with second hydraulic fluid port (A1) of described valve body, and described second hydraulic fluid port (A1) is a return opening.
6. rotary buffering valve according to claim 5, it is characterized in that, the 4th electric proportional pressure-reducing valve (12) and the 5th electric proportional pressure-reducing valve (13) also are set in the described valve body, described slewing directional control valve (11) is a pilot operated directional control valve, and two pilot port of described slewing directional control valve (11) are communicated with the oil outlet of the described the 4th electric proportional pressure-reducing valve (12) and the described the 5th electric proportional pressure-reducing valve (13) respectively.
7. rotary buffering valve according to claim 6, it is characterized in that, described valve body also has control port (X), and the filler opening of the described first electric proportional pressure-reducing valve (4), the described second electric proportional pressure-reducing valve (5), the described the 3rd electric proportional pressure-reducing valve (6), the described the 4th electric proportional pressure-reducing valve (12) and the described the 5th electric proportional pressure-reducing valve (13) all is communicated with described control port (X).
8. rotary buffering valve according to claim 7 is characterized in that, is equipped with first liquid resistance (14) on the path of the oil outlet of the described the 4th electric proportional pressure-reducing valve (12) and the described the 5th electric proportional pressure-reducing valve (13) and described slewing directional control valve (11) pilot port.
9. rotary buffering valve according to claim 8 is characterized in that, relief valve (16) also is set in the described valve body, and the filler opening of described relief valve (16) and oil outlet are communicated with the 3rd hydraulic fluid port (A) and the 4th hydraulic fluid port (B) of described valve body respectively.
10. rotary buffering valve according to claim 9, it is characterized in that, the precursor overflow valve (8) of main relief valve (7) and control described main relief valve (7) pilot pressure also is set in the described valve body, and the filler opening of described main relief valve (7) and oil outlet are communicated with first hydraulic fluid port (B1) and second hydraulic fluid port (A1) of described valve body respectively.
11. rotary buffering valve according to claim 10 is characterized in that, is provided with second liquid resistance (10) between the filler opening of the filler opening of described main relief valve (7) and described precursor overflow valve (8).
12. rotary buffering valve according to claim 11 is characterized in that, the feedback oil circuit of the 3rd hydraulic fluid port to the four hydraulic fluid ports of described valve body is provided with the 3rd liquid resistance (9).
13. a crane rotation hydraulic system comprises rotary pump, rotary motor and rotary buffering valve, it is characterized in that, described rotary buffering valve is each described rotary buffering valve of claim 1 to 12.
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| CN102320520A (en) * | 2011-08-18 | 2012-01-18 | 南通润邦重机有限公司 | Wind power installation crane hydraulic control circuit |
| 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 |
| CN102602830A (en) * | 2012-03-06 | 2012-07-25 | 中联重科股份有限公司 | Hydraulic rotary system and engineering vehicle |
| CN102730582A (en) * | 2012-06-20 | 2012-10-17 | 上海三一科技有限公司 | Hydraulic rotary system start-stop buffering device, and crane |
| CN102874698A (en) * | 2012-10-29 | 2013-01-16 | 徐州重型机械有限公司 | Device and method for preventing rotary mechanism from automatically rotating |
| CN102996559A (en) * | 2012-12-28 | 2013-03-27 | 徐州重型机械有限公司 | Rotation control valve, rotation control system and crane |
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| WO2014063490A1 (en) * | 2012-10-26 | 2014-05-01 | 中联重科股份有限公司 | Hydraulic system for controlling boom to rotate and control method therefor and concrete pumping equipment |
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| CN104214154A (en) * | 2014-08-11 | 2014-12-17 | 徐州徐工液压件有限公司 | Rotating buffer valve |
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| CN104533863A (en) * | 2014-12-30 | 2015-04-22 | 浙江大学 | Rotary system control valve of crane |
| CN104675783A (en) * | 2015-03-04 | 2015-06-03 | 徐州重型机械有限公司 | Rotary combined control valve, rotary system, crane and control method |
| CN104895869A (en) * | 2015-04-27 | 2015-09-09 | 徐工集团工程机械股份有限公司科技分公司 | Buffering module of hydraulic rotation platform |
| CN106414306A (en) * | 2014-03-04 | 2017-02-15 | 马尼托瓦克起重机有限责任公司 | Electronically controlled hydraulic swing system |
| CN106629431A (en) * | 2016-12-30 | 2017-05-10 | 徐州重型机械有限公司 | Hoist |
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| CN111891949A (en) * | 2020-07-24 | 2020-11-06 | 徐州重型机械有限公司 | Open type rotation control system |
| CN114131745A (en) * | 2021-12-06 | 2022-03-04 | 太原理工大学 | Block forming machine and hydraulic control system thereof |
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| CN104214154A (en) * | 2014-08-11 | 2014-12-17 | 徐州徐工液压件有限公司 | Rotating buffer valve |
| CN104214148A (en) * | 2014-08-29 | 2014-12-17 | 徐州徐工基础工程机械有限公司 | Intelligent buffering and overflowing device |
| CN104533863B (en) * | 2014-12-30 | 2016-06-29 | 浙江大学 | Crane rotation system control valve |
| CN104533863A (en) * | 2014-12-30 | 2015-04-22 | 浙江大学 | Rotary system control valve of crane |
| CN104675783A (en) * | 2015-03-04 | 2015-06-03 | 徐州重型机械有限公司 | Rotary combined control valve, rotary system, crane and control method |
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