CN102336363B - Crane and its load sensitive hydraulic control system - Google Patents
Crane and its load sensitive hydraulic control system Download PDFInfo
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- CN102336363B CN102336363B CN 201010232263 CN201010232263A CN102336363B CN 102336363 B CN102336363 B CN 102336363B CN 201010232263 CN201010232263 CN 201010232263 CN 201010232263 A CN201010232263 A CN 201010232263A CN 102336363 B CN102336363 B CN 102336363B
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Abstract
The invention discloses a load sensitive hydraulic control system, comprising a multipath directional control valve and a load sensitive pump having a load sensitive valve, wherein, a liquid inlet and an oil drain port of the multipath directional control valve are respectively communicated with a liquid outlet and an oil tank of the load sensitive pump, a load feedback port of the multipath directional control valve is communicated with a sensitive cavity of the load sensitive valve, and each uniting valve oil port of the multipath directional control valve is respectively connected with the corresponding executive component; the passage between the load feedback port of the multipath directional control valve and the sensitive cavity of the load sensitive valve is provided with a damper valve; the oil duct between an oil inlet and an oil outlet of the damper valve is provided with at least two dampings, and the oil duct between the adjacent two dampings is provided with a chamber having an enlarged cross section; and the oil outlet is communicated with the load feedback port of the multipath directional control valve, and the oil inlet is communicated with the sensitive cavity of the load sensitive valve. In addition, the invention provides a crane having the load sensitive hydraulic control system.
Description
Technical field
The present invention relates to technical field of engineering machinery, be specifically related to a kind of hoisting crane and load sensing hydraulic control system thereof.
Background technology
Along with progress and the development of elevator machinery, for hydraulic control technology more and more higher requirement has been proposed; Such as, except needs have good transmission performance, handling and maintenance easy, also need to satisfy preferably the requirement of the aspects such as energy-conservation, speed governing and composite move manipulation.
For the problems referred to above, existing hoisting crane adopts the load sensitive system technology, this system comprises load sensitive pump and load-sensitive valve, by detecting load pressure, flow and power variable signal, and this signal feedback to load sensitive pump realized Energy Saving Control, to reduce to greatest extent the pressure versus flow loss.
See also Fig. 1, the figure shows the existing principle sketch of central loading sensory system that closes.Wherein, the check valve 31 of multiway valve 30 is so that the pressure of its load feedback mouth XL joins the top pressure of load for each, this load feedback mouth XL is communicated with the sensitive cavity X mouth of load-sensitive valve 20, flow and the pressure of the responsive pump 10 of regulating load, like this, the pressure of pump exceeds the required pressure differential deltap P of control than required load pressure all the time, and exports required flow with required load pressure, thereby realizes load-sensitive control.
As everyone knows, the working condition of hoisting crane is comparatively complicated, especially long-armed hoisting during weight in being in, the pulsation of the vibration of the fugitiveness of load pressure, arm and steel rope and controllable capacity pump operation pressure intercouples, so that the dynamic characteristics of system is usually vibrated, less stable, thus lifting performance, fine motion, the safety of hoisting crane affected.
In view of this, demand for proposing to be optimized design from hydraulicdriven angle the adverse effect that produces for the behavioral characteristics of system with the pulsation of the fugitiveness of effectively avoiding load pressure and load sensitive pump operation pressure urgently.
Summary of the invention
For defects, the technical matters that the present invention solves is, a kind of load sensing hydraulic control system is provided, to eliminate the impact of load pressure fluctuation peak value, effectively reduce the fluctuation of pressure of feedback oil circuit, thereby the press and flux pulsation of realizing pump output is little, the equal non-jitter of the action of each power element.On this basis, the present invention also provides a kind of hoisting crane with this load sensing hydraulic control system.
Load sensing hydraulic control system provided by the invention comprises multichannel directional control valve and the load sensitive pump with load-sensitive valve; The inlet of described multichannel directional control valve and drain tap are communicated with liquid outlet and the fuel tank of load sensitive pump respectively, the load feedback mouth of described multichannel directional control valve is communicated with the sensitive cavity of described load-sensitive valve, and the valve oil mouth that respectively joins of described multichannel directional control valve is connected with corresponding power element respectively; Path is provided with dash pot valve between the sensitive cavity of the load feedback mouth of described multichannel directional control valve and described load-sensitive valve; Be provided with at least two dampings on the oil inlet of described dash pot valve and the oil duct between the oil outlet, and have the cavity volume that the cross section increases on the oil duct between adjacent two dampings; And described oil inlet is communicated with the load feedback mouth of described multichannel directional control valve, and described oil outlet is communicated with the sensitive cavity of described load-sensitive valve.
Preferably, be disposed with two dampings on the oil inlet of described dash pot valve and the oil duct between the oil outlet: the first damping and the second damping are provided with the first cavity volume between the two; Described dash pot valve also comprises the 3rd hydraulic fluid port and the 4th hydraulic fluid port, is disposed with the 3rd damping and the 4th damping on the oil duct between described the 3rd hydraulic fluid port and the 4th hydraulic fluid port, is provided with the second cavity volume between the two; And the oil duct between described the first cavity volume and the second cavity volume is provided with at least two dampings, and has the cavity volume that the cross section increases on the oil duct between adjacent two dampings.
Preferably, be provided with two dampings on the oil duct between described the first cavity volume and the second cavity volume: the 5th damping and the 6th damping.
Preferably, described oil inlet, the first damping, the second damping and the formed first passage of oil outlet and described the 3rd hydraulic fluid port, the 3rd damping, the 4th damping and the formed second channel of the 4th hydraulic fluid port lay respectively on the two parallel straight lines, and described the 5th damping is vertical respectively with second channel with first passage with the formed third channel of the 6th damping.
Preferably, described the 3rd hydraulic fluid port is communicated with fuel tank, described the 4th hydraulic fluid port shutoff.
Preferably, described the 3rd hydraulic fluid port shutoff, described the 4th hydraulic fluid port is communicated with fuel tank.
Hoisting crane provided by the invention comprises that described hydraulic control system adopts foregoing load sensing hydraulic control system for the hydraulic control system of each power element action of control.
The present invention transforms by load feedback mouth to the feedback oil circuit of load-sensitive valve to the multichannel directional control valve, and coupling is provided with dash pot valve, to reduce the fluctuation of pressure of feedback oil circuit.Owing to be provided with at least two dampings on the oil inlet of this dash pot valve and the valve body between the oil outlet, and have the cavity volume that the cross section increases on the oil duct between adjacent two dampings; Thereby the pressure adjustment between the load feedback mouth of realization multichannel directional control valve and the sensitive cavity of load-sensitive valve to eliminate the peak value of load pressure fluctuation, improves the pilot control of stroking mechanism.Because the present invention can avoid the operation pressure of the influence of fluctuations load sensitive pump of load pressure to produce the problem of pulsation, therefore, in hoisting crane is in during the operating mode of the long-armed weight that hoists, even the chatter phenomena of arm and steel rope occurs, can larger vibration not occur to the behavioral characteristics of complete machine, thereby greatly improved working stability, for lifting performance, fine motion and the safety that improves hoisting crane provides the failure-free guarantee.
In preferred version of the present invention, described dash pot valve has four hydraulic fluid ports, be disposed with four dampings on the valve body between its oil inlet and the oil outlet: the first damping, the second damping, the 3rd damping and the 4th damping, and be respectively arranged with three cavity volumes on the path between the first damping, the second damping, the 3rd damping and the 4th damping: the first cavity volume, the second cavity volume and the 3rd cavity volume; Be provided with the 5th damping on the path between its 3rd hydraulic fluid port and the first cavity volume, be provided with the 6th damping between its 4th hydraulic fluid port and the 3rd cavity volume; Simultaneously, the first hydraulic fluid port, the first damping, the 5th damping and the formed first passage of the 3rd hydraulic fluid port and the formed second channel almost parallel of described the second hydraulic fluid port, the 4th damping, the 6th damping and the 4th hydraulic fluid port; Form the damping networking of nearly " H " font.The 3rd hydraulic fluid port of this dash pot valve is communicated with fuel tank, the 4th hydraulic fluid port shutoff, thereby further effectively eliminate the peak value of load pressure fluctuation, reduce pressure gain, the fluctuation of pressure and the flow pulsation that realize the fluid that load sensitive pump is exported are little, each moves equal non-jitter, and then solves hoist in the time of the crack mouthful problem of shake of load sensing multi-way valve hydraulic efficiency pressure system.
Load sensing hydraulic control system provided by the invention is applicable to the construction machinery and equipment of any employing load sensing multi-way valve system, is specially adapted to hoisting crane.
Description of drawings
Fig. 1 is the fundamental diagram of existing load sensing hydraulic control system;
Fig. 2 is the fundamental diagram of load sensing hydraulic control system described in the specific embodiment;
Fig. 3 is the structure principle chart of dash pot valve described in the specific embodiment;
Fig. 4 is the integral structure scheme drawing of hoisting crane described in the specific embodiment;
Fig. 5 is the comparison of wave shape variation diagram of load sensitive pump delivery pressure PX.
Among Fig. 2-Fig. 4:
Multichannel directional control valve 1, load sensitive pump 2, load-sensitive valve 21, dash pot valve 3, the first damping 31, the second damping 32, the first cavity volume 33, the 3rd damping 34, the 4th damping 35, the second cavity volume 36, the 5th damping 37, the 6th damping 38, the 3rd cavity volume 39, fuel tank 4.
The specific embodiment
Core of the present invention provides a kind of load sensing hydraulic control system, to eliminate the impact of load pressure fluctuation peak value, effectively reduce the fluctuation of pressure of feedback oil circuit, thereby the press and flux pulsation of realizing pump output is little, the equal non-jitter of the action of each power element.
Specify present embodiment below in conjunction with Figure of description.
See also Fig. 2, this figure is the fundamental diagram of the described load sensing hydraulic control system of present embodiment.
This load sensing hydraulic control system comprises multichannel directional control valve 1, has the radical function elements such as the load sensitive pump 2 of load-sensitive valve 21, dash pot valve 3 and fuel tank 4.Wherein, the inlet P of multichannel directional control valve 1 is communicated with the liquid outlet A of load sensitive pump 2, and its drain tap T is communicated with fuel tank 4; In addition, this multichannel directional control valve 1 respectively join the valve oil mouth (A1 and B1, A2 are connected with B2 and are connected with corresponding power element respectively, such as, winding lifting motor, running motor etc.Pipeline annexation and prior art between multichannel directional control valve 1 and each power element are identical, do not illustrate so give in schematic diagram shown in Figure 2, to simplify accompanying drawing.Be understandable that those skilled in the art can realize fully based on prior art, so this paper repeats no more.
Multichannel directional control valve 1 has load feedback mouth XL, the pressure of this mouthful is the top pressure of each connection load, its sensitive cavity X with load-sensitive valve 21 is communicated with, and realizes Energy Saving Control with Real-time Feedback load pressure to load sensitive pump 1, to reduce to greatest extent the pressure versus flow loss.
As shown in Figure 3, be provided with two dampings on the oil inlet 3A of this dash pot valve 3 and the oil duct between the oil outlet 3B: the first damping 31 and the second damping 32, and between two dampings, and have the first cavity volume 33 that the cross section increases on the oil duct between two dampings; This oil inlet 3A is communicated with the load feedback mouth XL of multichannel directional control valve 1, and this oil outlet 3B is communicated with the sensitive cavity X of load-sensitive valve 21.Be to be understood that; the oil inlet 3A of dash pot valve 3 and the quantity of the damping on the oil duct between the oil outlet 3B are not limited to two shown in the figure; in fact; can determine according to actual needs quantity and the size of damping; as long as the cavity volume that the cross section increases is set on the oil duct between adjacent two dampings; with the pressure adjustment between the sensitive cavity of the load feedback mouth of realizing the multichannel directional control valve and load-sensitive valve, all in the scope that the application asks for protection.
For further improving the peak clipping effect of dash pot valve, this dash pot valve 3 also comprises the 3rd hydraulic fluid port 3C and the 4th hydraulic fluid port 3D, be disposed with the 3rd damping 34 and the 4th damping 35 on the oil duct between the 3rd hydraulic fluid port 3C and the 4th hydraulic fluid port 3D, be provided with the second cavity volume 36 that the cross section increases between the two on the oil duct.And the oil duct between the first cavity volume 33 and the second cavity volume 36 is provided with two dampings: the 5th damping 37 and the 6th damping 38, and be provided with the 3rd cavity volume 39 that the cross section increases on the oil duct between the two.Wherein, the 3rd hydraulic fluid port 3C is communicated with fuel tank 4, the 4th hydraulic fluid port 3D shutoff, thus path forms the damping networking between the sensitive cavity X of the load feedback mouth XL of multichannel directional control valve 1 and load-sensitive valve 21.
Similarly, the damping between the first cavity volume 33 and the second cavity volume 36 on the oil duct is not limited to two shown in the figure, and damping quantity between the two and size also can be determined according to actual needs.
As shown in the figure, oil inlet 3A, the first damping 31, the second damping 32 and the formed first passage of oil outlet 3B roughly are arranged in a linear, the 3rd hydraulic fluid port 3C, the 3rd damping 34, the 4th damping 35 and the formed second channel of the 4th hydraulic fluid port 3D also roughly are arranged in a linear, and first passage and second channel lay respectively on the straight line of two almost parallels; Simultaneously, the 5th damping 37 is vertical respectively with second channel with first passage with the 6th damping 38 formed third channels.On the whole, these dash pot valve 3 inner formed damping networkings roughly are " H " font.The peak value of load pressure fluctuation can be further eliminated in so design effectively, reduces pressure gain, realizes that fluctuation of pressure and the flow pulsation of fluid of load sensitive pump output is little, and each moves equal non-jitter.
Special version be, the annexation of the 3rd hydraulic fluid port 3C of aforementioned dash pot valve 3 and the 4th oil string 3D also can be exchanged, that is, the 3rd hydraulic fluid port 3C shutoff, the 4th hydraulic fluid port 3D is communicated with (not shown) with fuel tank 4.Equally, can consist of " H " font damping networking of dash pot valve inside.
See also Fig. 4, the figure shows the integral structure scheme drawing of the described hoisting crane of present embodiment.
Need to prove, the main function components such as the running gear of this hoisting crane, power system, crane system, hoisting system and electric system and prior art are identical, and those skilled in the art need not to pay performing creative labour based on prior art and just can realize.
The core design of the hoisting crane that present embodiment provides is to adopt aforementioned load sensing hydraulic control system, use the wave form varies of forward and backward load sensitive pump 2 delivery pressure PX as shown in Figure 5, obviously, the present invention has evaded the problem that the pulsation of the vibration of fugitiveness, arm and steel rope of load pressure and controllable capacity pump operation pressure intercouples, lifting performance, fine motion and the safety that can greatly improve hoisting crane.
The above only is preferred implementation 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 make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. load sensing hydraulic control system comprises multichannel directional control valve and the load sensitive pump with load-sensitive valve; The inlet of described multichannel directional control valve and drain tap are communicated with liquid outlet and the fuel tank of load sensitive pump respectively, the load feedback mouth of described multichannel directional control valve is communicated with the sensitive cavity of described load-sensitive valve, and the valve oil mouth that respectively joins of described multichannel directional control valve is connected with corresponding power element respectively; It is characterized in that path is provided with dash pot valve between the sensitive cavity of the load feedback mouth of described multichannel directional control valve and described load-sensitive valve; Be provided with at least two dampings on the oil inlet of described dash pot valve and the oil duct between the oil outlet, and have the cavity volume that the cross section increases on the oil duct between adjacent two dampings; And described oil inlet is communicated with the load feedback mouth of described multichannel directional control valve, and described oil outlet is communicated with the sensitive cavity of described load-sensitive valve.
2. load sensing hydraulic control system according to claim 1 is characterized in that, be disposed with two dampings on the oil inlet of described dash pot valve and the oil duct between the oil outlet: the first damping and the second damping are provided with the first cavity volume between the two; Described dash pot valve also comprises the 3rd hydraulic fluid port and the 4th hydraulic fluid port, is disposed with the 3rd damping and the 4th damping on the oil duct between described the 3rd hydraulic fluid port and the 4th hydraulic fluid port, is provided with the second cavity volume between the two; And the oil duct between described the first cavity volume and the second cavity volume is provided with at least two dampings, and has the cavity volume that the cross section increases on the oil duct between adjacent two dampings.
3. load sensing hydraulic control system according to claim 2 is characterized in that, is provided with two dampings on the oil duct between described the first cavity volume and the second cavity volume: the 5th damping and the 6th damping.
4. load sensing hydraulic control system according to claim 3, it is characterized in that, described oil inlet, the first damping, the second damping and the formed first passage of oil outlet and described the 3rd hydraulic fluid port, the 3rd damping, the 4th damping and the formed second channel of the 4th hydraulic fluid port lay respectively on the two parallel straight lines, and described the 5th damping is vertical respectively with second channel with first passage with the formed third channel of the 6th damping.
5. according to claim 3 or 4 described load sensing hydraulic control systems, it is characterized in that described the 3rd hydraulic fluid port is communicated with fuel tank, described the 4th hydraulic fluid port shutoff.
6. according to claim 3 or 4 described load sensing hydraulic control systems, it is characterized in that, described the 3rd hydraulic fluid port shutoff, described the 4th hydraulic fluid port is communicated with fuel tank.
7. hoisting crane comprises for the hydraulic control system of each power element action of control, and it is characterized in that, described hydraulic control system adopts such as each described load sensing hydraulic control system in the claim 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010232263 CN102336363B (en) | 2010-07-16 | 2010-07-16 | Crane and its load sensitive hydraulic control system |
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| CN 201010232263 CN102336363B (en) | 2010-07-16 | 2010-07-16 | Crane and its load sensitive hydraulic control system |
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| CN102336363A CN102336363A (en) | 2012-02-01 |
| CN102336363B true CN102336363B (en) | 2013-04-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108571486B (en) * | 2018-07-06 | 2021-08-06 | 江苏军源装备制造有限公司 | Cartridge valve for engineering machinery load sensing system |
| CN109019339B (en) * | 2018-08-30 | 2023-08-04 | 江苏建筑职业技术学院 | Hydraulic control valve assembly of tire crane and control method for tire crane according to working conditions |
| CN112524123B (en) * | 2020-12-25 | 2023-04-25 | 中国煤炭科工集团太原研究院有限公司 | Hydraulic system oscillation eliminator with special damping and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6216456B1 (en) * | 1999-11-15 | 2001-04-17 | Caterpillar Inc. | Load sensing hydraulic control system for variable displacement pump |
| JP2009108987A (en) * | 2007-10-31 | 2009-05-21 | Toshiba Mach Co Ltd | Hydraulic control device for construction machine |
| CN201473244U (en) * | 2009-08-15 | 2010-05-19 | 广西华力集团有限公司 | Hydraulic system of pipelayer |
| CN201722074U (en) * | 2010-07-16 | 2011-01-26 | 徐州重型机械有限公司 | Crane and load sensing hydraulic control system thereof |
-
2010
- 2010-07-16 CN CN 201010232263 patent/CN102336363B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6216456B1 (en) * | 1999-11-15 | 2001-04-17 | Caterpillar Inc. | Load sensing hydraulic control system for variable displacement pump |
| JP2009108987A (en) * | 2007-10-31 | 2009-05-21 | Toshiba Mach Co Ltd | Hydraulic control device for construction machine |
| CN201473244U (en) * | 2009-08-15 | 2010-05-19 | 广西华力集团有限公司 | Hydraulic system of pipelayer |
| CN201722074U (en) * | 2010-07-16 | 2011-01-26 | 徐州重型机械有限公司 | Crane and load sensing hydraulic control system thereof |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2009-108987A 2009.05.21 |
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