CN104747535A - Hydraulic buffering system and engineering machine - Google Patents
Hydraulic buffering system and engineering machine Download PDFInfo
- Publication number
- CN104747535A CN104747535A CN201510052485.3A CN201510052485A CN104747535A CN 104747535 A CN104747535 A CN 104747535A CN 201510052485 A CN201510052485 A CN 201510052485A CN 104747535 A CN104747535 A CN 104747535A
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- Prior art keywords
- valve
- hydraulic
- buffering
- oil circuit
- buffer system
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
Abstract
The invention relates to the technical field of hydraulics, and discloses a hydraulic buffering system and an engineering machine. The hydraulic buffering system comprises an oil pump, a first reversing valve, a hydraulic ram and a buffering oil passage. The oil pump is connected with a rod cavity and a rodless cavity of the hydraulic ram through the first reversing valve, the oil pump is connected with the buffering oil passage through the first reversing valve, the buffering oil passage and the hydraulic ram are arranged in parallel, and a switching valve and a buffering valve group are sequentially arranged on the buffering oil passage in series. According to the hydraulic buffering system and the engineering machine, the buffering oil passage is directly arranged in parallel relative to the rod cavity and the rodless cavity of the hydraulic ram, and the buffering valve group plays the buffering role selectively, so that under the condition that the regular work of the hydraulic ram and a main passage is not influenced, the hydraulic shock suffered by the hydraulic ram and related oil passages can be greatly relieved or even eliminated after a piston rod of the hydraulic ram suddenly stops stretching out and drawing back, components and parts of the hydraulic ram and the oil passages are protected from damage, and the service life is prolonged.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, particularly a kind of hydraulic buffer system and be provided with the engineering machinery of this hydraulic buffer system.
Background technique
In the course of the work, because of operating mode actual demand or driver personal operating habit, digger operating device (operating cylinder) or motor there will be the situation such as unexpected startup, braking suddenly to excavator.Under startup suddenly or brake condition, hydraulic pipe line closes suddenly, causes the hydraulic oil of motion to produce hydraulic shock, finally causes excavator complete machine oscillation or beat.Due to the structural feature of motor own, after integrated equilibrium valve and time-delay valve, the hydraulic shock that it starts and braking produces has obtained certain control.But, the large chamber of bucket arm cylinder and boom cylinder, particularly oil cylinder (rodless cavity) in operating cylinder, large to hydraulic oil demand, more easily produce larger hydraulic shock when starting braking.
At present, excavator producer is in order to address this problem, improve mainly for guide's oil circuit, such as, throttle orifice or one-way throttle valve is increased between the control end of selector valve controlling dipper or swing arm and manual pilot valve thereof, change-over valve core is opened, closing speed to utilize the damping effect of throttle orifice or one-way throttle valve to relax, thus reduces hydraulic shock.But the actual effect that the mode of this improvement oil circuit reaches has certain defect.
On the one hand, according to the working principle of throttle orifice and throttle valve, generally speaking, the size of this throttle orifice is less, its hydraulic cushion effect is more obvious, but this can cause changeover valve core travelling speed excessively slow, directly affects the speed of response of bucket arm cylinder or boom cylinder, affect excavator working efficiency, so the setting of this throttle orifice size is restricted, finally can only play certain abirritation, but cannot reach ideal effect.
On the other hand, although by the flow increasing throttle orifice or one-way throttle valve control guide oil circuit, the closing time extending the spool of selector valve with this is to relax hydraulic shock, but, in the moment that selector valve is closed, still can produce certain hydraulic shock, the hydraulic shock particularly when the swing arm of excavator promotes stopping is suddenly particularly evident.
Again on the one hand, because the aperture size of the throttle orifice on guide's oil circuit or throttle valve is little, therefore, it is not easily processed, and cost is high, and in actual use, is very easy to blocking, needs to safeguard and changes, affect working efficiency.
Therefore, related domain is needed badly provides a kind of new hydraulic buffer system, eliminates the defect in existing hydraulic circuit, avoids movable arm cylinder of excavator or bucket arm cylinder to be impacted.
Summary of the invention
In view of this, the present invention proposes a kind of hydraulic buffer system, and it can be used in excavator swing arm or bucket arm cylinder, eliminates the defect in existing hydraulic circuit, avoids boom cylinder or bucket arm cylinder to be impacted.
On the one hand, the invention provides hydraulic buffer system, it comprises oil pump, the first selector valve and hydraulic jack, and described oil pump is connected with the rod chamber of described hydraulic jack and rodless cavity respectively by described first selector valve, also comprises:
The buffering oil circuit that described oil pump is connected by described first selector valve, described buffering oil circuit and described hydraulic jack are arranged in parallel, and described buffering oil circuit have been arranged in series successively switch valve and trimmer valve group.
Further, described trimmer valve group comprises trimmer valve.
Further, described trimmer valve group comprises the throttle valve be arranged in series with described trimmer valve.
Further, described throttle valve comprises two, and described trimmer valve is one.
Further, described buffering oil circuit is also provided with the one-way valve of connecting with described switch valve and described trimmer valve group, and the flow direction of described one-way valve is point to the rodless cavity of described hydraulic jack from the rod chamber of described hydraulic jack.
Further, described switch valve is hydraulic-controlled switch valve, and described first selector valve is pilot operated directional control valve, has the first control end and the second control end;
Described hydraulic buffer system also comprises the pilot-actuated valve for controlling described first selector valve, described pilot-actuated valve connects described first control end by the first oil circuit control, controlling described first selector valve commutation makes described oil pump be communicated with the rod chamber of described hydraulic jack, described pilot-actuated valve connects described second control end by the second oil circuit control, controls described first selector valve commutation and described oil pump is communicated with the rodless cavity of described hydraulic jack;
Described pilot-actuated valve also connects the hydraulic control end of described switch valve by described first oil circuit control, control described switch valve and disconnect described buffering oil circuit; Described switch valve is normal open state.
Further, described switch valve is pilot operated directional control valve.Rod chamber and the rodless cavity of the direct opposing hydraulic oil cylinder of hydraulic buffer system of the present invention are arranged in parallel buffering oil circuit, and switch valve is set, utilize its conducting and disconnect this buffering oil circuit, control switch valve can be passed through thus, play buffer function with making trimmer valve group selection, thus the normal work of hydraulic jack and working connection can not be affected.When the first selector valve is in working position, hydraulic jack normally works, and switch valve can disconnect, and now cushions the normal work that oil circuit can not affect hydraulic jack and working connection, when control first selector valve is in meta, the working connection of hydraulic jack interrupts, it stops expanding-contracting action suddenly, now open switch valve, make the conducting of buffering oil circuit, hydraulic oil between rod chamber and rodless cavity can by the conducting of trimmer valve group, hydraulic oil in hydraulic jack there will not be complete closed state, therefore, the piston rod of hydraulic jack stop suddenly flexible after, this buffering oil circuit can alleviate the hydraulic shock even can eliminated and hydraulic jack and relevant oil circuit are subject to greatly, the component of protection hydraulic jack and oil circuit are not damaged, increase the service life.
On the other hand, the present invention also provides a kind of engineering machinery, and it is provided with hydraulic buffer system as above.
Further, described engineering machinery is excavator, and described hydraulic jack is the boom cylinder of described excavator.
Further, described engineering machinery is excavator, and described hydraulic jack is the bucket arm cylinder of described excavator.
This project machinery is provided with above-mentioned hydraulic buffer system, therefore has the technique effect identical with above-mentioned hydraulic buffer system, repeats no more.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The structural representation of a kind of hydraulic buffer system that Fig. 1 provides for the embodiment of the present invention.
Description of reference numerals
1-pilot-actuated valve; 2-first selector valve; 3-one-way valve; 4-second throttle; 5-trimmer valve; 6-hydraulic jack; 7-switch valve; 8-first throttle valve; 9-oil pump.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The structural representation of a kind of hydraulic buffer system that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, this hydraulic buffer system comprises oil pump 9, first selector valve 2 and hydraulic jack 6, oil pump 9 is connected with the rod chamber of hydraulic jack 6 and rodless cavity respectively by this first selector valve 2, oil pump 9 is also connected with buffering oil circuit by this first selector valve 2, hydraulic jack 6 is arranged in parallel with buffering oil circuit, this buffering oil circuit has been arranged in series successively switch valve 7 and trimmer valve group.
Hydraulic buffer system of the present invention is equivalent to the direct rod chamber at hydraulic jack and rodless cavity is arranged in parallel buffering oil circuit, and switch valve 7 is set on buffering oil circuit, it is utilized to make this conducting of buffering oil circuit and disconnection, thus by control switch valve 7, make trimmer valve group selectivity can play buffer function, thus the normal work of hydraulic jack and working connection can not be affected.
When the first selector valve 2 is in working position, hydraulic jack 6 normally works, and switch valve 7 can be selected to disconnect (namely upper in figure), now cushions the normal work that oil circuit can not affect hydraulic jack and working connection, when control first selector valve 2 is in meta, the working connection of hydraulic jack 6 interrupts, it stops expanding-contracting action suddenly, now open switch valve 7 (namely the next in figure), make the conducting of buffering oil circuit, hydraulic oil between rod chamber and rodless cavity can by the conducting of trimmer valve group, hydraulic oil in hydraulic jack 6 there will not be complete closed state, there will not be and build the pressure and damage the phenomenon of hydraulic jack 6, therefore, the piston rod of hydraulic jack 6 stop suddenly flexible after, this buffering oil circuit can alleviate the hydraulic shock even can eliminated and hydraulic jack and relevant oil circuit are subject to greatly, the component of protection hydraulic jack and oil circuit are not damaged, increase the service life.
Again shown in composition graphs 1, the hydraulic buffer system of this embodiment can also be embodied as more preferred scheme.As shown in the figure, first selector valve 2 is pilot operated directional control valve, be preferably three-position four-way valve, its filler opening a is connected with oil pump 9, its actuator port c is connected to the rod chamber of hydraulic jack 6 by the first oil circuit, actuator port d is connected to the rodless cavity of hydraulic jack 6 by the second oil circuit, and its drain tap b is connected with fuel tank T.This hydraulic buffer system also comprises the pilot-actuated valve 1 controlling this first selector valve 2, this pilot-actuated valve 1 connects first control end (the left control end shown in Fig. 1) of the first selector valve 2 by the first oil circuit control, controlling the commutation of this first selector valve 2 makes oil pump 1 be communicated with the rod chamber of hydraulic jack 6, correspondingly, this pilot-actuated valve 1 connects second control end (the left control end shown in Fig. 1) of the first selector valve 2 by the second oil circuit control, controls the commutation of this first selector valve 2 and oil pump 1 is communicated with the rodless cavity of hydraulic jack 6.
Buffering oil circuit be set directly at the first selector valve 2 and rod chamber connection oil circuit and and the connection oil circuit of rodless cavity between, and this buffering oil circuit has been arranged in series switch valve 7, first throttle valve 8, trimmer valve 5, second throttle 4 and one-way valve 3 successively.Wherein, being arranged so that the hydraulic oil of buffering oil circuit flows to and pointing to rodless cavity from the rod chamber of hydraulic jack 6 of one-way valve 3.That is, 3, one-way valve allows hydraulic oil to flow through buffering oil circuit from rod chamber and flows to rodless cavity, and the hydraulic oil of rodless cavity cannot flow to rod chamber through this buffering oil circuit.
One-way valve 3 is so arranged, on the one hand, the sectional area being the sectional area ratio rod chamber considered due to rodless cavity is large, the demand of rodless cavity to hydraulic oil is larger, therefore, if when hydraulic jack 6 stop motion suddenly or suddenly setting in motion, actual conditions in rodless cavity oil-feed, piston rod are stretched out in process to stop suddenly, or when starting from rodless cavity oil-feed, piston rod to be stretched out, the impact produced, than stopping suddenly in rod chamber oil-feed process, or the impact starting to produce from rod chamber oil-feed is larger, therefore, the preferred version of this hydraulic buffer system arranges the one-way valve 3 shown in figure, can alleviate targetedly or eliminate the greater impact produced in actual conditions, make this hydraulic buffer system can adapt to actual working condition better, on the other hand, to prevent the piston rod of hydraulic jack 6 from occurring " bar of sauntering " phenomenon, namely when the first selector valve 2 cuts out (being positioned at meta), because failure and other reasons causes rodless cavity fuel feeding to stop, if the hydraulic oil in the rodless cavity of now hydraulic jack is back in rod chamber through buffering oil circuit, then there is back " bar of the sauntering " phenomenon of sauntering in piston rod, and one-way valve 3 can effectively prevent this phenomenon from occurring, and avoids the accident occurring to cause thus.
In addition, switch valve 7 is hydraulic-controlled switch valve, and is preferably the pilot operated directional control valve shown in figure, and its hydraulic control end is connected to the first oil circuit control of aforementioned pilot-actuated valve 1, make pilot-actuated valve 1 can control the commutation of this pilot operated directional control valve, and then control conducting and the disconnection of buffering oil circuit.Commutate to left position when pilot-actuated valve 1 controls the first selector valve 2 by the first oil circuit control, thus make the rod chamber oil-feed of hydraulic jack 6, the piston rod of hydraulic jack 6 is shunk, now, pilot-actuated valve 1 is disconnected by the first oil circuit control control switch valve 7 simultaneously, the hydraulic oil of the first oil circuit cannot pass through this buffering oil circuit, namely cushion oil circuit and now can not affect hydraulic jack 6 and working connection (the first oil circuit, second oil circuit) normal work, thus, the action that the Placement of this switch valve 7 can avoid buffering oil circuit and hydraulic jack 6 to shrink piston rod interferes.
It should be noted that, under the prerequisite of the preferred Placement shown in Fig. 1, switch valve 7 is normal open state, namely conducting between the rod chamber of buffering oil circuit and hydraulic jack 6 and rodless cavity is kept under normal circumstances, this is to enable buffering oil circuit can conducting play buffer function when piston rod to stretch out in process and stops suddenly, cushions and eliminates the impact that rod chamber is subject to.Piston rod is made to stretch out in process in the rodless cavity oil-feed of hydraulic jack 6, unexpected stopping is to rodless cavity fuel feeding, piston rod is stopped mobile, then due to the conducting of buffering oil circuit, in rod chamber, hydraulic oil can flow to rodless cavity through this buffering oil circuit, therefore, the hydraulic shock that now rod chamber is subject to can greatly be alleviated or eliminate.Those skilled in the art should be understood that, even if when the rodless cavity oil-feed of hydraulic jack 6 makes piston rod stretch out, owing to being provided with one-way valve 3, the hydraulic oil in the second oil circuit cannot pass through from this buffering oil circuit, therefore, cushion oil circuit and can not affect stretching out of piston rod.Certainly, those skilled in the art it is also understood that and arrange a kind of optimal way that one-way valve 3 is the present embodiment, and can cancel this one-way valve 3 in other embodiments or adopt other set-up modes, the present invention does not limit this.
As shown in Figure 1, buffering oil circuit in this hydraulic buffer system is also provided with two throttle valve (first throttle valve 8 and second throttle 4), these two throttle valve can better coordinate trimmer valve 5 to absorb the hydraulic shock of rod chamber, play better buffer function.Certainly, can select to arrange the throttle valve of varying number in other embodiments and whether arrange throttle valve, the present invention does not limit this.
Embodiments of the invention also provide a kind of engineering machinery, and this project machinery is provided with above-mentioned hydraulic buffer system.This project machinery is provided with above-mentioned hydraulic buffer system, therefore, it is possible to the hydraulic shock that cushion cylinder and oil circuit are subject to, the component of protection oil cylinder and oil circuit are not damaged, and increase the service life.
This project machinery is preferably excavator, and the hydraulic jack in hydraulic buffer system is preferably the boom cylinder of excavator, and namely above-mentioned hydraulic buffer system is preferred for the boom cylinder of excavator.Description in conjunction with above-mentioned hydraulic buffer system embodiment is known, after adopting above-mentioned hydraulic system, when boom cylinder drives swing arm to move, above-mentioned hydraulic buffer system can cushion the hydraulic shock produced when swing arm stops suddenly or starts, and the preferred version of above-mentioned hydraulic buffer system produces when can be applicable to the large chamber of boom cylinder in real work (rodless cavity) oil-feed better and impacts larger situation, also utilize the cooperation of switch valve and one-way valve to cooperate simultaneously, make to cushion the normal work that oil circuit can not affect boom cylinder, can ensure that swing arm rises, the speed declined.
Correspondingly, above-mentioned hydraulic buffer system can also be applied to the bucket arm cylinder of excavator, and the hydraulic jack 6 namely in above-mentioned hydraulic buffer system is the bucket arm cylinder of excavator, and it can alleviate or eliminate generation hydraulic shock equally, and concrete effect repeats no more.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a hydraulic buffer system, comprises oil pump, the first selector valve and hydraulic jack, and described oil pump is connected with the rod chamber of described hydraulic jack and rodless cavity respectively by described first selector valve, it is characterized in that, also comprises:
The buffering oil circuit that described oil pump is connected by described first selector valve, described buffering oil circuit and described hydraulic jack are arranged in parallel, and described buffering oil circuit have been arranged in series successively switch valve and trimmer valve group.
2. hydraulic buffer system according to claim 1, is characterized in that, described trimmer valve group comprises trimmer valve.
3. hydraulic buffer system according to claim 2, is characterized in that, described trimmer valve group comprises the throttle valve be arranged in series with described trimmer valve.
4. hydraulic buffer system according to claim 3, is characterized in that, described throttle valve comprises two, and described trimmer valve is one.
5. hydraulic buffer system as claimed in any of claims 1 to 4, it is characterized in that, described buffering oil circuit is also provided with the one-way valve of connecting with described switch valve and described trimmer valve group, and the flow direction of described one-way valve is point to the rodless cavity of described hydraulic jack from the rod chamber of described hydraulic jack.
6. hydraulic buffer system according to claim 5, is characterized in that, described switch valve is hydraulic-controlled switch valve, and described first selector valve is pilot operated directional control valve, has the first control end and the second control end;
Described hydraulic buffer system also comprises the pilot-actuated valve for controlling described first selector valve, described pilot-actuated valve connects described first control end by the first oil circuit control, controlling described first selector valve commutation makes described oil pump be communicated with the rod chamber of described hydraulic jack, described pilot-actuated valve connects described second control end by the second oil circuit control, controls described first selector valve commutation and described oil pump is communicated with the rodless cavity of described hydraulic jack;
Described pilot-actuated valve also connects the hydraulic control end of described switch valve by described first oil circuit control, control described switch valve and disconnect described buffering oil circuit; Described switch valve is normal open state.
7. hydraulic buffer system according to claim 4, is characterized in that, described switch valve is pilot operated directional control valve.
8. an engineering machinery, is characterized in that, is provided with hydraulic buffer system as claimed in any of claims 1 to 7 in one of claims.
9. engineering machinery according to claim 8, is characterized in that, described engineering machinery is excavator, and described hydraulic jack is the boom cylinder of described excavator.
10. engineering machinery according to claim 8, is characterized in that, described engineering machinery is excavator, and described hydraulic jack is the bucket arm cylinder of described excavator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510052485.3A CN104747535B (en) | 2015-02-02 | 2015-02-02 | Hydraulic buffering system and engineering machine |
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| CN201510052485.3A CN104747535B (en) | 2015-02-02 | 2015-02-02 | Hydraulic buffering system and engineering machine |
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| CN104747535A true CN104747535A (en) | 2015-07-01 |
| CN104747535B CN104747535B (en) | 2017-02-22 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270108A (en) * | 2016-08-29 | 2017-01-04 | 南通锻压设备股份有限公司 | Separate unit integrated form blanking buffer unit |
| CN107061422A (en) * | 2017-06-29 | 2017-08-18 | 长沙学院 | Stabilization control device and method in hydraulic cylinder positioning braking procedure |
| CN107061421A (en) * | 2017-06-29 | 2017-08-18 | 长沙学院 | A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder |
| CN107061423A (en) * | 2017-06-29 | 2017-08-18 | 长沙学院 | A kind of hydraulic cylinder brakes stabilization control device and method |
| WO2017215631A1 (en) * | 2016-06-16 | 2017-12-21 | 朱德伟 | Hydraulic cushioning device and cushioning cylinder comprising device |
| CN107975562A (en) * | 2017-12-27 | 2018-05-01 | 山东科技大学 | A kind of digit buffer and its application |
| CN110710373A (en) * | 2019-09-30 | 2020-01-21 | 黑龙江八一农垦大学 | Hydraulic rotary driving device for agricultural machine |
| CN110741167A (en) * | 2018-05-21 | 2020-01-31 | Smc 株式会社 | Method and device for driving fluid pressure cylinder |
| CN111959025A (en) * | 2020-08-17 | 2020-11-20 | 吴盼磊 | Full-automatic stamping and stretching production device and control method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62110002A (en) * | 1985-11-05 | 1987-05-21 | Seirei Ind Co Ltd | Shock relieving device in normal-reverse switching hydraulic circuit |
| CN102200148A (en) * | 2011-07-01 | 2011-09-28 | 宁波市恒通液压科技有限公司 | Buffer valve |
| CN102297173A (en) * | 2011-09-01 | 2011-12-28 | 晋中榆次中劲液压机械有限公司 | Electromagnetic buffer valve |
| 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 |
| CN202707661U (en) * | 2012-08-23 | 2013-01-30 | 中联重科股份有限公司渭南分公司 | Pilot cushion valve, buffer damping hydraulic control return circuit and engineering mechanical device |
| CN103572788A (en) * | 2013-08-22 | 2014-02-12 | 襄阳忠良工程机械有限责任公司 | Wheel hoeing machine |
-
2015
- 2015-02-02 CN CN201510052485.3A patent/CN104747535B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62110002A (en) * | 1985-11-05 | 1987-05-21 | Seirei Ind Co Ltd | Shock relieving device in normal-reverse switching hydraulic circuit |
| CN102200148A (en) * | 2011-07-01 | 2011-09-28 | 宁波市恒通液压科技有限公司 | Buffer valve |
| CN102297173A (en) * | 2011-09-01 | 2011-12-28 | 晋中榆次中劲液压机械有限公司 | Electromagnetic buffer valve |
| 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 |
| CN202707661U (en) * | 2012-08-23 | 2013-01-30 | 中联重科股份有限公司渭南分公司 | Pilot cushion valve, buffer damping hydraulic control return circuit and engineering mechanical device |
| CN103572788A (en) * | 2013-08-22 | 2014-02-12 | 襄阳忠良工程机械有限责任公司 | Wheel hoeing machine |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10738802B2 (en) | 2016-06-16 | 2020-08-11 | Qingdao Acme Innovation Technology Co., Ltd. | Hydraulic buffer and cylinder combined with the same |
| KR102128464B1 (en) | 2016-06-16 | 2020-06-30 | 칭다오 에이씨엠이 이노베이션 테크놀러지 컴퍼니 리미티드 | Hydraulic shock absorber and cylinder combined with it |
| KR20190007493A (en) * | 2016-06-16 | 2019-01-22 | 칭다오 에이씨엠이 이노베이션 테크놀러지 컴퍼니 리미티드 | Hydraulic shock absorbers and associated cylinders |
| WO2017215631A1 (en) * | 2016-06-16 | 2017-12-21 | 朱德伟 | Hydraulic cushioning device and cushioning cylinder comprising device |
| CN106270108A (en) * | 2016-08-29 | 2017-01-04 | 南通锻压设备股份有限公司 | Separate unit integrated form blanking buffer unit |
| CN107061422B (en) * | 2017-06-29 | 2018-12-14 | 长沙学院 | Hydraulic cylinder positions the stabilization control device and method in braking process |
| CN107061423B (en) * | 2017-06-29 | 2018-12-25 | 长沙学院 | A kind of hydraulic cylinder braking stabilization control device and method |
| CN107061423A (en) * | 2017-06-29 | 2017-08-18 | 长沙学院 | A kind of hydraulic cylinder brakes stabilization control device and method |
| CN107061421A (en) * | 2017-06-29 | 2017-08-18 | 长沙学院 | A kind of pressure-releasing type braking stabilization control device and method of hydraulic cylinder |
| CN107061422A (en) * | 2017-06-29 | 2017-08-18 | 长沙学院 | Stabilization control device and method in hydraulic cylinder positioning braking procedure |
| CN107975562A (en) * | 2017-12-27 | 2018-05-01 | 山东科技大学 | A kind of digit buffer and its application |
| CN110741167A (en) * | 2018-05-21 | 2020-01-31 | Smc 株式会社 | Method and device for driving fluid pressure cylinder |
| CN110710373A (en) * | 2019-09-30 | 2020-01-21 | 黑龙江八一农垦大学 | Hydraulic rotary driving device for agricultural machine |
| CN111959025A (en) * | 2020-08-17 | 2020-11-20 | 吴盼磊 | Full-automatic stamping and stretching production device and control method thereof |
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