CN103697013B - With the hydraulic jack of safety valve - Google Patents
With the hydraulic jack of safety valve Download PDFInfo
- Publication number
- CN103697013B CN103697013B CN201310680208.8A CN201310680208A CN103697013B CN 103697013 B CN103697013 B CN 103697013B CN 201310680208 A CN201310680208 A CN 201310680208A CN 103697013 B CN103697013 B CN 103697013B
- Authority
- CN
- China
- Prior art keywords
- spool
- hydraulic jack
- valve port
- spring
- safety valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Safety Valves (AREA)
Abstract
The present invention relates to a kind of hydraulic jack, controllably do not decline for solving the large hydraulic jack of existing load range hydraulic cylinder piston rod when joint or pipelines from bursting lost efficacy and cause the shortcoming of cargo damage and potential safety hazard, the invention provides a kind of hydraulic jack with safety valve, what comprise in cylinder tube oil charging-discharging enters oil discharge passage, entering in oil discharge passage to be provided with safety valve, safety valve comprise two spools set gradually and two correspond to the spring that spool provides elastic force, spool is provided with the valve port being communicated with spool two ends, spool compressible spring mobile effective aperture of reducing valve port but not exclusively closed, it is unequal when the effective aperture of two spool valve ports is decreased to minimum, the lift oil tank that can be used as large load range at hydraulic jack of the present invention uses, the piston rod of hydraulic jack all can be made to bounce back with the speed of safety if there is pipelines from bursting when underloading and heavily loaded operation, and carry out double reduction when heavy duty and reduce impact, ensure the safety of operating personnel and goods.
Description
Technical field
The present invention relates to a kind of hydraulic jack, particularly relate to a kind of hydraulic jack with safety valve.
Background technique
Hydraulic jack is a kind of common linear drives equipment, be commonly used for jacking apparatus, such as jacking cylinder on fork truck, the oil pocket of hydraulic jack is connected with oil supplying device by joint, pipeline, oil supplying device stretches out to the piston rod of hydraulic jack during oil cylinder pumps hydraulic oil and makes goods lifting, when the hydraulic oil in hydraulic jack controllably flows out by the road under the control of control valve, the piston rod of hydraulic jack slowly controllably declines together with goods.The hydraulic jack of this structure is when joint or hydraulic pipe line generation explosion failure, hydraulic oil in hydraulic jack does not then controllably flow out fast, goods decline colliding surface or be subject to the impact of limit stoper fast under gravity, cause cargo damage, and security threat is caused to operator, around operating personnel and goods.And heavy duty was lost efficacy when declining, impacted more violent, the damage caused and threaten even more serious.
Fig. 1 shows a kind of existing elevating ram, this safety valve comprises piston rod 12, cylinder barrel, there is in the bottom of cylinder barrel 13 cylinder bottom 5 and joint 7, be provided with in cylinder bottom 5 and joint 7 and oil discharge passage 6 is entered to cylinder barrel oil pocket oil charging-discharging, entering in oil discharge passage to be provided with safety valve, safety valve comprises spool 16, spring 15, spool 16 is hollow cylinder, its one end open, the other end is provided with aperture 18, side is provided with macropore 17, spring is positioned at hollow cylinder, its one end contacts with hollow cylinder and connects, the other end is connected with junction contacts, when this elevating ram normally works, the pressure reduction produced at spool two ends can not Compress Spring, hydraulic oil is normally passed in and out by the macropore on spool, when the pipeline between elevating ram and control valve and joint explosion failure, the flow of the hydraulic oil flowed out in cylinder cavity increases instantaneously, the pressure reduction formed at the two ends of spool 16 is greater than the elastic force of spring, spool Compress Spring moves, the macropore of spool side is blocked closedown, spool only there is the aperture of its end be communicated with spool two ends, hydraulic oil flows out from aperture, the throttling action of aperture forms lasting pressure reduction at the two ends of spool but spool keeps different, hydraulic oil thus flow out lentamente from aperture, piston rod bounces back lentamente, guarantee the safety by the goods of lifting and personnel.The elevating ram of this structure is applicable to side crops industry scope and uses, but when being used in the large load range of large-tonnage, this only have the safety valve of a safe spool to have following shortcoming:
1, during pipelines from bursting, the speed goes that hydraulic oil flows out under the weight of goods is large, the speed of goods tenesmus is also increasing, when flow is greatly to when can make the spool of safety valve move its valve port opening of change, spool moves and that its valve port opening is decreased to is minimum, the now cataclysm of flow makes the speed obtaining tenesmus also cataclysm occur, thus produce impact, this all can produce larger danger to goods and personnel around, especially, when heavy duty, damage may be caused to equipment and goods.
When there is explosion failure in the hydraulic pipe line 2, between control valve to hydraulic jack, joint, the hydraulic fluid flow rate flowed out in hydraulic cylinder is relevant in the pressure difference at minimum aperture place with hydraulic oil with aperture minimum in outflow lines, minimum aperture is relevant with the minimum aperture of safety valve, and pressure difference is then relevant with contained goods weight.When this jacking cylinder in large load range uses; pipeline explosion failure is there is when underloading and heavy duty; pressure difference at safety valve two ends is different; therefore pipelines from bursting and pipelines from bursting time heavily loaded when underloading; its flow is also different; the speed of goods tenesmus is also just different, during underloading pipelines from bursting safety valve can guarantee goods with the speed of safety decline may not guarantee heavy duty time pipelines from bursting goods decline with the speed of safety.
Summary of the invention
The object of the invention is to controllably do not decline for hydraulic jack hydraulic cylinder piston rod when joint or pipelines from bursting lost efficacy that existing load range is large and cause the shortcoming of cargo damage and potential safety hazard and a kind of hydraulic jack that hydraulic cylinder piston rod can be made slowly to bounce back when joint or pipelines from bursting lost efficacy is provided, and when decline was lost efficacy in heavy duty, perform twice deceleration, more effectively reduce the possibility damaged with dangerous.
Technological scheme of the present invention is achieved in that provides a kind of hydraulic jack with safety valve, what comprise in cylinder tube oil charging-discharging enters oil discharge passage, entering in oil discharge passage to be provided with safety valve, safety valve comprises the first spool, first spring, second spool, second spring, first spool, second spool is entering in oil discharge passage to set gradually, first spring provides to the first spool and enters the rightabout active force in the fuel-displaced direction of oil discharge passage, first spool is provided with first valve port at connection first spool two ends, compressible first spring of first spool effective aperture of mobile reduction first valve port but not exclusively closed, second spring provides to the second spool and enters the rightabout active force in the fuel-displaced direction of oil discharge passage, second spool is provided with second valve port at connection second spool two ends, and the second spool compresses the second spring and effective aperture of mobile reduction second valve port but not exclusively closed, valve port opening when the effective aperture of second valve port is decreased to minimum is greater than valve port opening when the effective aperture of the first valve port is decreased to minimum.
When hydraulic jack in the present invention is used as the elevating ram use of large load range, bounce back under the Action of Gravity Field of contained object during the retraction of hydraulic cylinder piston rod, the retraction speed of piston rod is relevant to the flow of the hydraulic oil flowed out in hydraulic cylinder, under normal conditions, the flow that hydraulic oil flows out is controlled by control valve, flow through the flow of the first spool and the second spool at the first spool two ends, the pressure reduction that second spool two ends produce is less, can not overcome the first spring and the second spring elastic force and the first spool and the second spool are moved or amount of movement less, the valve port opening of the first valve port and the second valve port is constant, do not affect the normal retraction of piston rod.But when there is explosion failure in the hydraulic pipe line between control valve to hydraulic jack, joint, the hydraulic fluid flow rate flowed out in hydraulic cylinder is then relevant in the pressure difference at minimum aperture place with hydraulic oil with aperture minimum in outflow lines, and now minimum in outflow lines aperture just depends on effective aperture less in the first spool or the second spool.If the hydraulic pipe line explosion when carrying out underloading, first can produce pressure reduction make the second spool compress the second spring at the two ends of the second spool and move, the effective aperture reducing the second valve port is decreased to minimum, the pressure reduction now produced at the first spool two ends then can not make the first spool compress the first spring and move, and effective aperture of the first valve port finally remains unchanged.Now effective aperture of the first valve port is greater than effective aperture of the second valve port; the flow that hydraulic oil flows out determines by hydraulic jack internal pressure when the minimum effective aperture of the second valve port and underloading; at this moment can by the minimum effective aperture of underloading load design second valve port determined; hydraulic pipe line explosion is there is when underloading load if make; the piston rod of hydraulic jack still can bounce back with the speed of safety, guarantees the safety of goods and personnel.When carrying out heavy duty, much bigger compared with when hydraulic jack internal pressure and underloading, if now there is pipelines from bursting, weight is in the process of tenesmus, the flow flowing through the second spool also increases gradually, and reach very soon and make the second spool move and be decreased to minimum effective aperture, thus reduce the acceleration of weight tenesmus, second spool move to the effective aperture of its valve port move to minimum after, but because during heavy duty, hydraulic jack internal pressure is very large, flow when hydraulic oil flows out still can increase, the flow increased finally can produce larger pressure reduction greatly two of the first spool, thus make the first spool overcome the elastic force of the first spring and move, first spool moves to limit position, effective aperture of the first valve port is also decreased to minimum, now effective aperture of the first valve port is less than effective aperture of the second valve port, the flow that hydraulic oil flows out determines by hydraulic jack internal pressure when the minimum effective aperture of the first valve port and heavy duty, at this moment can by the minimum effective aperture of heavily loaded load design first valve port determined, hydraulic pipe line explosion is there is when heavily loaded load if make, the piston rod of hydraulic jack still can to bounce back safely, guarantee the safety of goods and personnel.Therefore when hydraulic jack of the present invention is applied to the lift oil tank of large load range, no matter be underloading or heavy duty, if there is pipelines from bursting, load all can be made to decline in the rate of descent of safety, ensure the safety of goods and personnel.When heavy duty through twice deceleration, heavily loaded goods can finally decline with the speed of safety, avoids the impact occurring strengthening.
In the present invention, the first spool and the second spool set gradually entering the direction of flowing out in hydraulic oil cylinder barrel according to hydraulic oil in oil discharge passage.First spring one end is connected with the end contact of the second spool, and the first spring the other end contacts with the first spool and connects.
In the present invention, the rigidity of the second spring is not more than the rigidity of the first spring, and maximum effective aperture of the second valve port is not more than maximum effective aperture of the first valve port.This measure can guarantee that the priority of the first spool and the second spool moves order.
In the present invention as stated above, the first spool is the hollow cylinder of one end open, hollow cylinder opening end towards consistent with the fuel-displaced direction entering oil discharge passage, the first valve port comprises the through hole being arranged on hollow cylinder side and hollow cylinder inner space.First valve port also comprise be arranged on hollow cylinder with opening end opposing end surface on the discharge orifice of hollow cylinder inner space.
In the present invention as stated above, the second spool be the hollow cylinder of one end open and opening end towards consistent with the fuel-displaced direction entering oil discharge passage, described second valve port comprises the through hole being arranged on spool side and inner space.Second valve port also comprises the discharge orifice be arranged on end face relative with opening end on the second spool.
In the present invention, enter oil discharge passage and be made up of the joint on cylinder barrel by by cylinder barrel and being arranged on, the joint that the opening end of the second spool is positioned at, the second spring is positioned at described second spool, and its one end contacts with the second spool and connects, and the other end is connected with form touch.
The beneficial effect that the present invention compared with prior art has: the lift oil tank that can be used as large load range at hydraulic jack of the present invention uses, no matter be when carrying out underloading operation and heavily loaded operation, if generation pipelines from bursting, the piston rod of hydraulic jack all can be made to bounce back with the speed of safety, and then ensure the safety of operator, around operating personnel and goods, and the pipelines from bursting when heavy duty, can carry out double reduction, reduce and impact.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing elevating ram.
Fig. 2 is the structural representation of hydraulic jack of the present invention.
Fig. 3 is the zoomed-in view of part section bottom hydraulic jack of the present invention.
Fig. 4 be hydraulic jack of the present invention in underload and pipeline or joint explosion time safety valve cross-sectional operational views.
Fig. 5 be hydraulic jack of the present invention in heavy duty and pipeline or joint explosion time safety valve cross-sectional operational views.
Component title and sequence number in figure:
Second spool 1, second spring 2, second spool macropore 3, second spool discharge orifice 4, cylinder bottom 5, enter oil discharge passage 6, joint 7, first spring 8, first spool 9, first spool macropore 10, first spool discharge orifice 11, piston rod 12, cylinder barrel 13, cylinder barrel oil pocket 14, spring 15, spool 16, macropore 17, aperture 18.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments is described.
As shown in Figure 2, in the present embodiment, hydraulic jack forms primarily of piston rod 12, cylinder barrel 13.As shown in Figure 3, the bottom of cylinder barrel 13 has cylinder bottom 5 and joint 7, what in cylinder bottom 5 and joint 7, be provided with in cylinder barrel oil pocket 14 charge and discharge hydraulic oil enters oil discharge passage 6, entering in oil discharge passage 6 to be provided with safety valve, safety valve comprises the first spool 9, first spring 8, second spool 1, second spring 2, first spool 9, second spool 1 sets gradually entering the direction of flowing out in inner cavity of cylinder 6 according to hydraulic oil in oil discharge passage 6, second spool 1 is the hollow cylinder of one end open, the opening end of hollow cylinder is towards the direction of joint 7, second spool 1 is provided with second valve port at connection second spool two ends, second valve port is made up of with the second spool discharge orifice 4 of hollow cylinder inner space with being arranged on hollow cylinder with on opening end opposing end surface the second spool macropore 3 being arranged on hollow cylinder side and hollow cylinder inner space, second spring 2 is arranged in the inner chamber of the second spool 1, its one end contacts with the second spool and connects, one end contacts with joint 7 and connects in addition.First spool 9 is also the hollow cylinder of one end open, the opening end of this hollow cylinder is towards the oil-feed direction entering oil discharge passage, also namely towards the direction of the second spool 1, first spool 9 is provided with first valve port at connection first spool two ends, first valve port is made up of with the first spool discharge orifice 11 of this hollow cylinder inner space with being arranged on this hollow cylinder with on opening end opposing end surface the first spool macropore 10 being arranged on this hollow cylinder side and this hollow cylinder inner space, first spring 8 is arranged in the inner chamber of the first spool 9, its one end contacts with the first spool 9 and connects, one end contacts with the termination of the second spool 1 and connects in addition.In the present embodiment, if when the pressure reduction at the second spool 1 two ends is greater than the elastic force of the second spring 2, second spool 1 compresses the second spring 2 and moves, second spool macropore 3 of the second spool side is partly or entirely blocked, second spool discharge orifice 4 of its end face is opened, but so equally also cause effective aperture of the second valve port to reduce, the flow flowing through this valve port can be reduced.If when in like manner the pressure reduction at the first spool 1 two ends is greater than the elastic force of the first spring, first spool 9 compresses the first spring 8 and moves, first spool macropore 10 of the first spool 9 side is blocked, only stay the first spool discharge orifice 11 of its end face, cause effective aperture of the first valve port to reduce, the flow flowing through this valve port can be reduced.In the present embodiment, the rigidity of the second spring is less than the rigidity of the first spring, and the second spool 1 compresses the first spring 2 to effective aperture of the second valve port during irremovable limit position is greater than the first spool 9 and compresses the first spring 8 to effective aperture of the first valve port during irremovable limit position and want large.When the first spool and the second spool all do not compress the first corresponding spring and the second spring, maximum effective aperture of the second valve port is not more than maximum effective aperture of the first valve port.
When hydraulic jack in the present embodiment can be used as the use of large-tonnage elevating ram, bounce back under the Action of Gravity Field of contained object during the retraction of hydraulic cylinder piston rod 12, the retraction speed of piston rod 12 is relevant to the flow of the hydraulic oil flowed out in hydraulic cylinder, under normal conditions, the flow that hydraulic oil flows out is controlled by control valve, flow through the flow of the first spool 9 and the second spool 1 at the first spool 9 two ends, the pressure reduction that second spool 1 two ends produce all can not overcome the elastic force of the first spring 8 and the second spring 2 and move, first spool 9 and the second spool 1 does not move or amount of movement is less, the effective aperture of valve port of the first valve port and the second valve port is constant, do not affect the normal retraction of piston rod.But when there is explosion failure in the hydraulic pipe line between control valve to hydraulic jack, joint, the hydraulic fluid flow rate flowed out in hydraulic cylinder is then relevant with the difference of the pressure in aperture minimum in outflow lines and cylinder barrel and external pressure differential, now minimum in outflow lines aperture just depends on effective aperture less in the first spool or the second spool, pressure difference inside and outside cylinder barrel depends on load, load is larger, and the pressure difference inside and outside cylinder barrel is larger.If the hydraulic pipe line explosion when carrying out underloading, flow increases gradually along with the acceleration decline of goods, finally produce pressure reduction make the second spool compress the second spring at the two ends of the second spool and move, second spool macropore 3 of the second spool side is blocked or partial occlusion, effective aperture of the second valve port is decreased to minimum, the pressure reduction now produced at the first spool two ends then can not make the first spool compress the first spring and move, and effective aperture of the first valve port finally remains unchanged.The flow that now hydraulic oil flows out determines by hydraulic jack internal pressure when the minimum effective aperture of the second valve port and underloading, the second spool macropore 3 gap decision that the now minimum effective aperture of the second valve port is closed by the second spool discharge orifice 4 and the side of the second spool end.Like this can by the minimum effective aperture of underloading load design second valve port determined, if make, hydraulic pipe line explosion occurs when underloading load, the piston rod of hydraulic jack still can bounce back with the speed of safety, guarantees the safety of goods and personnel.
When carrying out heavy duty, much bigger compared with when hydraulic jack internal pressure and underloading, if now there is pipelines from bursting, flow increases gradually along with the acceleration decline of goods, the very fast two ends at the second spool produce pressure reduction and make the second spool compress the second spring and move, make effective aperture of the second valve port be decreased to minimum, thus reduce the acceleration of goods decline, although now the second spool moves to its valve port effective aperture when being decreased to minimum, but because hydraulic jack internal pressure is very large, flow when hydraulic oil flows out is still very large, larger flow can produce larger pressure reduction at the two ends of the first spool, thus make the first spool overcome the elastic force of the first spring and move, first spool moves to limit position, first spool macropore 10 of the first spool side is blocked closedown completely, effective aperture of the first valve port is also decreased to minimum, be the first spool discharge orifice 11, the flow that now hydraulic oil flows out determines by hydraulic jack internal pressure when the first spool discharge orifice 11 and heavy duty, reduce further the flow that hydraulic oil flows out, at this moment can by the size of heavily loaded load design first spool discharge orifice 11 determined, hydraulic pipe line explosion is there is when heavily loaded load if make, the piston rod of hydraulic jack still can bounce back with the speed of safety, guarantee the safety of goods and personnel.Therefore hydraulic jack of the present invention is applied to the lift oil tank of large load range is no matter be underloading or heavy duty, if there is pipelines from bursting, load all can be made to decline in the rate of descent of safety, ensures the safety of goods and personnel.And carry out twice deceleration when heavy duty, reduce impact when goods slows down, improve Security.
Claims (10)
1. the hydraulic jack with safety valve, what comprise in cylinder tube oil charging-discharging enters oil discharge passage, it is characterized in that: entering in oil discharge passage to be provided with safety valve, described safety valve comprises the first spool, first spring, second spool, second spring, described first spool, second spool is entering in oil discharge passage to set gradually, described first spring provides to the first spool and enters the rightabout active force in the fuel-displaced direction of oil discharge passage, first spool is provided with first valve port at connection first spool two ends, compressible first spring of first spool effective aperture of mobile reduction first valve port but not exclusively closed,
Described second spring provides to the second spool and enters the rightabout active force in the fuel-displaced direction of oil discharge passage, second spool is provided with second valve port at connection second spool two ends, and the second spool compresses the second spring and effective aperture of mobile reduction second valve port but not exclusively closed;
Valve port opening when the effective aperture of described second valve port is decreased to minimum is greater than valve port opening when the effective aperture of the first valve port is decreased to minimum.
2. the hydraulic jack with safety valve according to claim 1, is characterized in that described first spool and the second spool set gradually entering the direction of flowing out in hydraulic oil cylinder barrel according to hydraulic oil in oil discharge passage.
3. the hydraulic jack with safety valve according to claim 2, is characterized in that described first spring one end is connected with the end contact of described second spool, and the described first spring the other end contacts with described first spool and connects.
4. the hydraulic jack with safety valve according to claim 1, is characterized in that the rigidity of described second spring is not more than the rigidity of described first spring.
5. the hydraulic jack with safety valve according to any one of claim 1 to 4, it is characterized in that described first spool is the hollow cylinder of one end open, the opening end of described hollow cylinder towards consistent with the fuel-displaced direction entering oil discharge passage, described first valve port comprises the through hole being arranged on hollow cylinder side and hollow cylinder inner space.
6. the hydraulic jack with safety valve according to claim 5, it is characterized in that described first valve port also comprise be arranged on hollow cylinder with opening end opposing end surface on the discharge orifice of hollow cylinder inner space.
7. the hydraulic jack with safety valve according to any one of claim 1 to 4, it is characterized in that described second spool be the hollow cylinder of one end open and opening end towards with the fuel-displaced direction entering oil discharge passage, described second valve port comprises the through hole being arranged on spool side and inner space.
8. the hydraulic jack with safety valve according to claim 7, enter oil discharge passage described in it is characterized in that to be made up of cylinder tube and the joint be arranged on cylinder tube, the opening end of described second spool is positioned at described joint, described second spring is positioned at described second spool, its one end contacts with the second spool and connects, and the other end is connected with junction contacts.
9. the hydraulic jack with safety valve according to claim 7, is characterized in that described second valve port also comprises the discharge orifice be arranged on end face relative with opening end on the second spool.
10. the hydraulic jack with safety valve according to claim 1, is characterized in that maximum effective aperture of described second valve port is not more than maximum effective aperture of the first valve port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310680208.8A CN103697013B (en) | 2013-12-13 | 2013-12-13 | With the hydraulic jack of safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310680208.8A CN103697013B (en) | 2013-12-13 | 2013-12-13 | With the hydraulic jack of safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103697013A CN103697013A (en) | 2014-04-02 |
| CN103697013B true CN103697013B (en) | 2016-03-23 |
Family
ID=50358650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310680208.8A Active CN103697013B (en) | 2013-12-13 | 2013-12-13 | With the hydraulic jack of safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103697013B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109424598A (en) * | 2017-08-28 | 2019-03-05 | 湖南财经工业职业技术学院 | A kind of anti-explosion safety connector and hydraulic system |
| US11174959B2 (en) * | 2017-09-21 | 2021-11-16 | Kosmek Ltd. | Sequence valve-mounted cylinder device |
| CN108443269B (en) * | 2018-03-23 | 2023-07-28 | 浙江迦南科技股份有限公司 | Unidirectional speed limiting device |
| CN113027857A (en) * | 2021-03-27 | 2021-06-25 | 刘斌霞 | Inclined hydraulic oil cylinder with safety valve |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3741241A (en) * | 1971-07-29 | 1973-06-26 | Eaton Corp | Hydraulic fuse |
| US4704947A (en) * | 1985-10-21 | 1987-11-10 | Versa Technologies, Inc. | Bidirectional fluid flow valve |
| US6173734B1 (en) * | 1999-11-03 | 2001-01-16 | Brightvalve Llc | Leak arresting mechanical flow control valve |
| CN2752236Y (en) * | 2003-02-26 | 2006-01-18 | 安徽合力股份有限公司 | Forklift lifting oil cylinder bottom buffer apparatus |
| CN2833289Y (en) * | 2005-07-02 | 2006-11-01 | 吴正平 | Explosion-proof safety valve for pipeline |
| CN101839360A (en) * | 2009-03-14 | 2010-09-22 | 陈中华 | Novel safety valve |
| CN202659993U (en) * | 2012-05-25 | 2013-01-09 | 浙江苏强格液压股份有限公司 | One-way throttling valve |
| CN202834266U (en) * | 2012-09-26 | 2013-03-27 | 杭叉集团股份有限公司 | Safety valve of forklift lifting cylinder |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3496808B2 (en) * | 1998-08-03 | 2004-02-16 | 日本輸送機株式会社 | Ram cylinder |
| US20080006330A1 (en) * | 2006-07-05 | 2008-01-10 | Zhou Huasong | A Throttle Mechanism |
| JP5267888B2 (en) * | 2010-07-27 | 2013-08-21 | ニチユ三菱フォークリフト株式会社 | Lift cylinder and forklift having the same |
-
2013
- 2013-12-13 CN CN201310680208.8A patent/CN103697013B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3741241A (en) * | 1971-07-29 | 1973-06-26 | Eaton Corp | Hydraulic fuse |
| US4704947A (en) * | 1985-10-21 | 1987-11-10 | Versa Technologies, Inc. | Bidirectional fluid flow valve |
| US6173734B1 (en) * | 1999-11-03 | 2001-01-16 | Brightvalve Llc | Leak arresting mechanical flow control valve |
| CN2752236Y (en) * | 2003-02-26 | 2006-01-18 | 安徽合力股份有限公司 | Forklift lifting oil cylinder bottom buffer apparatus |
| CN2833289Y (en) * | 2005-07-02 | 2006-11-01 | 吴正平 | Explosion-proof safety valve for pipeline |
| CN101839360A (en) * | 2009-03-14 | 2010-09-22 | 陈中华 | Novel safety valve |
| CN202659993U (en) * | 2012-05-25 | 2013-01-09 | 浙江苏强格液压股份有限公司 | One-way throttling valve |
| CN202834266U (en) * | 2012-09-26 | 2013-03-27 | 杭叉集团股份有限公司 | Safety valve of forklift lifting cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103697013A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103697013B (en) | With the hydraulic jack of safety valve | |
| CN104370223B (en) | Control the hydraulic control system of triplex sequential telescopic, suspension arm mechanism and crane | |
| US7458308B2 (en) | Multistaged telescope boom | |
| US3285282A (en) | Flow control valve for fluid motors and the like | |
| US7703616B2 (en) | Telescopable sliding beam | |
| CN107208402A (en) | Compensator device | |
| CN103896155B (en) | Control the hydraulic control system of twin-tub sequential telescopic, suspension arm mechanism and hoisting crane | |
| CN104591014A (en) | Telescopic cylinder, landing leg control system and crane | |
| CN103899585A (en) | Hydraulic control system with two oil cylinders performing orderly telescopic motion, suspension arm mechanism and crane | |
| CN104444866B (en) | Control system of telescopic mechanism and crane with same | |
| CN111350703B (en) | Control valve group, sliding system, erecting device and control method | |
| CN102434529B (en) | Hydraulic cylinder expansion control loop and engineering mechanical equipment | |
| CN205823794U (en) | There is the lift oil tank of New Buffering structure | |
| CN109437069B (en) | Sequential telescopic boom system of overhead working truck | |
| DE102016103256A1 (en) | Truck with a mast | |
| CN104533873A (en) | Two-way self-locking hydraulic cylinder | |
| CN204533029U (en) | Bidirectional self-locking oil hydraulic cylinder | |
| CN104747523A (en) | Releasing speed restriction hydraulic control valve | |
| CN105417429A (en) | Counter weight lifting device and crane with same | |
| CN103867524A (en) | Double-acting second-level hydraulic cylinder | |
| CN107061377A (en) | A kind of heavy duty lifting electrohydraulic control system | |
| CN203715094U (en) | Hydraulic control system for controlling sequential expansion of double cylinders, suspension arm mechanism and crane | |
| CN105041362A (en) | Mining hydraulic support for replacing hydraulic media under pressure | |
| CN104386597B (en) | Anti-impact electromagnetic unloading valve of straight-arm lorry-mounted crane | |
| CN109404440B (en) | Automatic locking device for road bridge mechanical anti-slip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |