CN103899594B - Internal expansion type locking cylinder manualemergency operating device and method - Google Patents
Internal expansion type locking cylinder manualemergency operating device and method Download PDFInfo
- Publication number
- CN103899594B CN103899594B CN201410114929.7A CN201410114929A CN103899594B CN 103899594 B CN103899594 B CN 103899594B CN 201410114929 A CN201410114929 A CN 201410114929A CN 103899594 B CN103899594 B CN 103899594B
- Authority
- CN
- China
- Prior art keywords
- fluid port
- hydraulic fluid
- locking cylinder
- expansion type
- type locking
- 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.)
- Expired - Fee Related
Links
Abstract
The invention discloses a kind of internal expansion type locking cylinder manualemergency operating device and method, this device comprises: three-position four-way electromagnetic directional valve (14), the 6th hydraulic fluid port (15), the 7th hydraulic fluid port (16) of drain charge stop valve (1), the first hand pump (2), isolation stop valve (3), the first hydraulic fluid port (4), accumulator (5), pressure gauge (6), the second hydraulic fluid port (7), the 3rd hydraulic fluid port (8), hydraulic pipe line (9), the 4th hydraulic fluid port (10), the 5th hydraulic fluid port (11), the second hand pump (12), one-way valve (13), band hand push rod; The oil outlet of the first hand pump (2), the first hydraulic fluid port (4), accumulator (5), pressure gauge (6), a hydraulic fluid port of isolation stop valve (3), a hydraulic fluid port of drain charge stop valve (1) pass through hydraulic pipe line two two intercommunicating.Application the present invention, can realize that internal expansion type locking cylinder piston rod is emergent to be stretched out or regain.
Description
Technical field
The present invention relates to internal expansion type locking cylinder manualemergency operating device.When hydraulic system dead electricity, the manual-operated emergent using this device can complete internal expansion type locking cylinder piston stretches out or regains.
Background technique
Hydraulic cylinder piston rod stretch out and bearing load time, General Requirements piston rod keeps its position not retract within a certain period of time, usually adopts hydraulic lock loop to realize the hydraulic locking of piston rod.Because internal leakage is inevitable, hydraulic lock loop conventional under long-term work cannot ensure the positional accuracy of hydraulic cylinder piston rod.Locking cylinder is the special oil cylinder that a class adopts mechanical interlocking method locking cylinder barrel and piston (or piston rod), owing to have employed mechanical interlocking method, and the piston rod retraction phenomenon that the internal leakage avoiding conventional oil cylinder causes.By the difference of mechanical interlocking mode, develop a variety of locking cylinder, internal expansion type locking cylinder is one wherein.
Working principle is see Fig. 1, and piston and cylinder barrel adopt interference fit, and degree of interference fit determines the size of coupling mechanism force.Unlock high pressure oil when the first hydraulic fluid port, conduit are injected between piston and cylinder barrel, cylinder barrel spreading, interference fit becomes Spielpassung, and the logical oil of the second hydraulic fluid port, c, piston rod stretches out or regains.When unlocking high pressure oil drain charge, cylinder barrel latching ram.
Internal expansion type locking cylinder has an outstanding feature: conduit, piston rod cavity, piston radial hole form a closed cavity, and when piston rod stretches out, this cavity volume increases, and when piston rod is regained, volume reduces.This feature makes internal expansion type locking cylinder that conventional hand pump can not be adopted as emergent unblock power source.If produce with conventional manual pump and unlock high pressure oil, when piston rod stretches out, above-mentioned sealed cavity volume becomes large, and unlocking pressure is down to 0 immediately, very easily between piston and cylinder barrel, produces pull-cylinder phenomena.
Internal expansion type locking cylinder is already ripe technically, be widely used in the fields such as radar truck leveling, but have not yet to see the bibliographical information of internal expansion type locking cylinder manualemergency operating device, also without Related product, the emergency method of usual employing directly removes locking cylinder, wastes time and energy.
Summary of the invention
Technical problem: technical problem to be solved by this invention is to provide a kind of internal expansion type locking cylinder manualemergency operating device and method, when hydraulic system dead electricity, application the present invention can make internal expansion type locking cylinder piston rod stretch out or regain.
Summary of the invention: for solving the problems of the technologies described above, the invention provides a kind of internal expansion type locking cylinder manualemergency operating device, this device comprises:
Drain charge stop valve, the first hand pump, isolation stop valve, the first hydraulic fluid port, accumulator, pressure gauge, the second hydraulic fluid port, the 3rd hydraulic fluid port, hydraulic pipe line, the 4th hydraulic fluid port, the 5th hydraulic fluid port, the second hand pump, one-way valve, the three-position four-way electromagnetic directional valve of band hand push rod, the 6th hydraulic fluid port, the 7th hydraulic fluid port;
The oil outlet of the first hand pump, the first hydraulic fluid port, accumulator, pressure gauge, a hydraulic fluid port of isolation stop valve, a hydraulic fluid port of drain charge stop valve pass through hydraulic pipe line two two intercommunicating;
Inlet port, the 3rd hydraulic fluid port of the inlet port of the first hand pump, another hydraulic fluid port of drain charge stop valve, the second hand pump pass through hydraulic pipe line two two intercommunicating;
The oil outlet of the second hand pump is connected with the free-flow end hydraulic pipe line of one-way valve; The pressure end of one-way valve, the pressure port P of the three-position four-way electromagnetic directional valve of band hand push rod, the 4th hydraulic fluid port are connected by hydraulic pipe line;
5th hydraulic fluid port is connected by hydraulic pipe line with the oil return inlet T of the three-position four-way electromagnetic directional valve of band hand push rod;
6th hydraulic fluid port is connected with the delivery outlet B of the three-position four-way electromagnetic directional valve of band hand push rod;
7th hydraulic fluid port is connected with the delivery outlet A of the three-position four-way electromagnetic directional valve of described band hand push rod;
Accumulator declines for the unlocking pressure compensated when internal expansion type locking cylinder piston rod stretches out; Pressure gauge is for monitoring the change of unlocking pressure.
Preferably, drain charge stop valve is attempted by the first hand pump inlet port and oil outlet.
Preferably, isolate stop valve to be connected on first and manually to pump between hydraulic fluid port and the second hydraulic fluid port.
Preferably, one-way valve is connected between the second hand pump and the 4th hydraulic fluid port.
Present invention also offers a kind of internal expansion type locking cylinder manual-operated emergent operating method, the method comprises the steps:
First hydraulic fluid port connects the unblock hydraulic fluid port of internal expansion type locking cylinder, and the 3rd hydraulic fluid port connects hydraulic reservoir, and the second hydraulic fluid port connects hydraulic system major loop;
4th hydraulic fluid port connects hydraulic system major loop, and the 5th hydraulic fluid port connects hydraulic system return line, and the 6th hydraulic fluid port, the 7th hydraulic fluid port connect rod chamber, the rodless cavity of internal expansion type locking cylinder respectively;
When hydraulic system dead electricity, make isolation stop valve, drain charge stop valve is in cut-off state; Operating the first hand pump makes the first hydraulic fluid port pressure oil output to accumulator topping up, unlocking pressure is increased to rating value gradually, now internal expansion type locking cylinder unlocks, pushed to by the side hand push rod of the three-position four-way electromagnetic directional valve of band hand push rod, operation hand pump makes the piston rod of internal expansion type locking cylinder stretch out or regain;
When internal expansion type locking cylinder piston rod stretches out, increase owing to unlocking oil working volume, unlocking pressure can decline gradually, when the unlocking pressure of pressure gauge instruction drop to rating value lower in limited time, operate the first hand pump and unlocking pressure raised;
When internal expansion type locking cylinder piston rod is regained, reduce owing to unlocking oil working volume, unlocking pressure can raise gradually, when the unlocking pressure of pressure gauge instruction be increased to rating value upper in limited time, drain charge stop valve should be operated, between the first hydraulic fluid port and the 3rd hydraulic fluid port, form drain charge loop, unlocking pressure is declined;
Blocked operation first hand pump and drain charge stop valve, make the unblock of internal expansion type locking cylinder, operates the second hand pump simultaneously and make internal expansion type locking cylinder piston rod stretch out or regain.
Preferably, the 3rd hydraulic fluid port is communicated to below the hydraulic oil liquid level in hydraulic reservoir.
Beneficial effect: application the present invention, can realize by manpower under power failure state that internal expansion type locking cylinder piston rod is emergent to be stretched out or regain easily, and the various vehicular platforms for application internal expansion type locking cylinder provide a kind of meeting an urgent need and remove the means of receipts fast.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art;
Wherein, 1 ' piston; 2 ' piston rod; 3 ' conduit; 4 ' cylinder barrel
Fig. 2 is structural representation provided by the invention;
1. stop valve 4. first hydraulic fluid port isolated by drain charge stop valve 2. first hand pump 3.
5. accumulator 6. pressure gauge 7. second hydraulic fluid port 8. the 3rd hydraulic fluid port
9. hydraulic pipe line 10. the 4th hydraulic fluid port 11. the 5th hydraulic fluid port 12. second hand pump
The three-position four-way electromagnetic directional valve of 13. one-way valves 14. with hand push rod
15. the 6th hydraulic fluid port 16. the 7th hydraulic fluid ports
Embodiment
Below in conjunction with drawings and the embodiments, patent of the present invention is described in further detail:
As shown in Figure 1, described internal expansion type locking cylinder manualemergency operating device comprises three-position four-way electromagnetic directional valve 14, the 6th hydraulic fluid port 15, the 7th hydraulic fluid port 16 of drain charge stop valve 1, first hand pump 2, isolation stop valve 3, first hydraulic fluid port 4, accumulator 5, pressure gauge 6, second hydraulic fluid port 7, the 3rd hydraulic fluid port 8, hydraulic pipe line 9, the 4th hydraulic fluid port 10, the 5th hydraulic fluid port 11, second hand pump 12, one-way valve 13, band hand push rod.
The oil outlet of the first hand pump 2, the first hydraulic fluid port 4, accumulator 5, pressure gauge 6, an isolation hydraulic fluid port of stop valve 3, a hydraulic fluid port of drain charge stop valve 1 are interconnected by hydraulic pipe line;
Inlet port, the 3rd hydraulic fluid port 8 of the inlet port of the first hand pump 2, another hydraulic fluid port of drain charge stop valve 1, the second hand pump 12 are interconnected by hydraulic pipe line;
The oil outlet of the second hand pump 12 is connected with the free-flow end hydraulic pipe line of one-way valve 13; The pressure end of one-way valve 13, the pressure port P of the three-position four-way electromagnetic directional valve 14 of band hand push rod, the 4th hydraulic fluid port 10 are connected by hydraulic pipe line;
5th hydraulic fluid port 11 is connected by hydraulic pipe line with the oil return inlet T of the three-position four-way electromagnetic directional valve 14 of band hand push rod;
6th hydraulic fluid port 15 is connected with the delivery outlet B of the three-position four-way electromagnetic directional valve 14 of band hand push rod;
7th hydraulic fluid port 16 is connected with the delivery outlet A of the three-position four-way electromagnetic directional valve 14 of described band hand push rod;
Accumulator 5 declines for the unlocking pressure compensated when internal expansion type locking cylinder piston rod stretches out; Pressure gauge 6 is for monitoring the change of unlocking pressure.
Drain charge stop valve 1 is attempted by the first hand pump 2 inlet port and oil outlet.Usually should be in rest position, when the withdrawal of internal expansion type locking cylinder piston rod causes unlocking pressure to rise, drain charge stop valve should be rotated, between the first hand pump 2 oil outlet and inlet port, form drain charge loop, make unlocking pressure drop to suitable value.One-way valve 13 for isolating the second hand pump 12 and hydraulic system major loop, when second hand pump 12 occur leak time do not affect hydraulic system have electricity condition under normal use.
Isolation stop valve 3 is connected between the first hand pump 2 oil outlet and the second hydraulic fluid port 7.Oil circuit and hydraulic system solution lock loop is unlocked for isolating, prevent the excessive unlocking pressure that causes of hydraulic main circuit internal leakage from cannot set up, when utilizing the present invention, isolation stop valve should be made to be in cut-off state, after using the present invention, isolation stop valve should be made to be in open position.
One-way valve 13 is connected between the second hand pump 12 and the 4th hydraulic fluid port 10.
Present invention also offers a kind of internal expansion type locking cylinder manual-operated emergent operating method, the method comprises the steps:
First hydraulic fluid port 4 connects the unblock hydraulic fluid port of internal expansion type locking cylinder, and the 3rd hydraulic fluid port 8 connects hydraulic reservoir, and the second hydraulic fluid port 7 connects hydraulic system major loop;
4th hydraulic fluid port 10 connects hydraulic system major loop, and the 5th hydraulic fluid port 11 connects hydraulic system return line, and the 6th hydraulic fluid port 15, the 7th hydraulic fluid port 16 connect rod chamber, the rodless cavity of internal expansion type locking cylinder respectively;
When hydraulic system dead electricity, make isolation stop valve 3, drain charge stop valve 1 is in cut-off state; Operating the first hand pump 2 makes the first hydraulic fluid port 4 pressure oil output to accumulator 5 topping up, unlocking pressure is increased to rating value gradually, now internal expansion type locking cylinder unlocks, the side hand push rod of the three-position four-way electromagnetic directional valve 14 of band hand push rod is pushed to, operates the second hand pump 12 and make the piston rod of internal expansion type locking cylinder stretch out or regain;
When internal expansion type locking cylinder piston rod stretches out, increase owing to unlocking oil working volume, unlocking pressure can decline gradually, the unlocking pressure indicated when pressure gauge 6 drop to rating value lower in limited time, operate the first hand pump 2 and unlocking pressure raised;
When internal expansion type locking cylinder piston rod is regained, reduce owing to unlocking oil working volume, unlocking pressure can raise gradually, the unlocking pressure indicated when pressure gauge 6 be increased to rating value upper in limited time, drain charge stop valve 1 should be operated, between the first hydraulic fluid port 1 and the 3rd hydraulic fluid port 8, form drain charge loop, unlocking pressure is declined;
Blocked operation first hand pump 2 and drain charge stop valve 1, make internal expansion type locking cylinder unlock, and operates the second hand pump 12 simultaneously and make internal expansion type locking cylinder piston rod stretch out or regain.
3rd hydraulic fluid port 8 is communicated to below the hydraulic oil liquid level in hydraulic reservoir.
The present invention does not affect hydraulic system the normal running under electricity condition.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles 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 (6)
1. an internal expansion type locking cylinder manualemergency operating device, is characterized in that, this device comprises:
Drain charge stop valve (1), first hand pump (2), isolation stop valve (3), first hydraulic fluid port (4), accumulator (5), pressure gauge (6), second hydraulic fluid port (7), 3rd hydraulic fluid port (8), hydraulic pipe line (9), 4th hydraulic fluid port (10), 5th hydraulic fluid port (11), second hand pump (12), one-way valve (13), three-position four-way electromagnetic directional valve (14) with hand push rod, 6th hydraulic fluid port (15), 7th hydraulic fluid port (16),
The oil outlet of the first hand pump (2), the first hydraulic fluid port (4), accumulator (5), pressure gauge (6), a hydraulic fluid port of isolation stop valve (3), a hydraulic fluid port of drain charge stop valve (1) pass through hydraulic pipe line two two intercommunicating;
The inlet port of the inlet port of the first hand pump (2), another hydraulic fluid port of drain charge stop valve (1), the second hand pump (12), the 3rd hydraulic fluid port (8) are by hydraulic pipe line two two intercommunicating;
The oil outlet of the second hand pump (12) is connected with the free-flow end hydraulic pipe line of one-way valve (13); The pressure end of one-way valve (13), the pressure port (P) being with the three-position four-way electromagnetic directional valve (14) of hand push rod, the 4th hydraulic fluid port (10) are by hydraulic pipe line two two intercommunicating;
5th hydraulic fluid port (11) is connected by hydraulic pipe line with the return opening (T) of the three-position four-way electromagnetic directional valve (14) of band hand push rod;
6th hydraulic fluid port (15) is connected with the delivery outlet (B) of the three-position four-way electromagnetic directional valve (14) of band hand push rod;
7th hydraulic fluid port (16) is connected with the delivery outlet (A) of the three-position four-way electromagnetic directional valve (14) of described band hand push rod;
Accumulator (5) declines for the unlocking pressure compensated when internal expansion type locking cylinder piston rod stretches out; Pressure gauge (6) is for monitoring the change of unlocking pressure.
2. internal expansion type locking cylinder manualemergency operating device according to claim 1, is characterized in that, drain charge stop valve (1) is attempted by the first hand pump (2) inlet port and oil outlet.
3. internal expansion type locking cylinder manualemergency operating device according to claim 1, is characterized in that, isolation stop valve (3) is connected between the first hand pump (2) oil outlet and the second hydraulic fluid port (7).
4. internal expansion type locking cylinder manualemergency operating device according to claim 1, is characterized in that, one-way valve (13) is connected between the second hand pump (12) and the 4th hydraulic fluid port (10).
5. an internal expansion type locking cylinder manual-operated emergent operating method, it is characterized in that, the method comprises the steps:
First hydraulic fluid port (4) connects the unblock hydraulic fluid port of internal expansion type locking cylinder, and the 3rd hydraulic fluid port (8) connects hydraulic reservoir, and the second hydraulic fluid port (7) connects hydraulic system major loop;
4th hydraulic fluid port (10) connects hydraulic system major loop, 5th hydraulic fluid port (11) connects hydraulic system return line, 6th hydraulic fluid port (15) connects the rod chamber of internal expansion type locking cylinder, and the 7th hydraulic fluid port (16) connects the rodless cavity of internal expansion type locking cylinder;
When hydraulic system dead electricity, make isolation stop valve (3), drain charge stop valve (1) is in cut-off state; Operating the first hand pump (2) makes the first hydraulic fluid port (4) pressure oil output to accumulator (5) topping up, unlocking pressure is increased to rating value gradually, now internal expansion type locking cylinder unlocks, the side hand push rod of the three-position four-way electromagnetic directional valve (14) of band hand push rod is pushed to, operates the second hand pump and make the piston rod of internal expansion type locking cylinder stretch out or regain;
When internal expansion type locking cylinder piston rod stretches out, increase owing to unlocking oil working volume, unlocking pressure can decline gradually, the unlocking pressure indicated when pressure gauge (6) drop to rating value lower in limited time, operate the first hand pump (2) and unlocking pressure raised;
When internal expansion type locking cylinder piston rod is regained, reduce owing to unlocking oil working volume, unlocking pressure can raise gradually, the unlocking pressure indicated when pressure gauge (6) be increased to rating value upper in limited time, drain charge stop valve (1) should be operated, between the first hydraulic fluid port (4) and the 3rd hydraulic fluid port (8), form drain charge loop, unlocking pressure is declined;
Blocked operation first hand pump (2) and drain charge stop valve (1), make internal expansion type locking cylinder unlock, and operates the second hand pump (12) simultaneously and make internal expansion type locking cylinder piston rod stretch out or regain.
6. internal expansion type locking cylinder manual-operated emergent operating method according to claim 5, is characterized in that, the 3rd hydraulic fluid port (8) is communicated to below the hydraulic oil liquid level in hydraulic reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410114929.7A CN103899594B (en) | 2014-03-25 | 2014-03-25 | Internal expansion type locking cylinder manualemergency operating device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410114929.7A CN103899594B (en) | 2014-03-25 | 2014-03-25 | Internal expansion type locking cylinder manualemergency operating device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103899594A CN103899594A (en) | 2014-07-02 |
| CN103899594B true CN103899594B (en) | 2016-01-06 |
Family
ID=50991111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410114929.7A Expired - Fee Related CN103899594B (en) | 2014-03-25 | 2014-03-25 | Internal expansion type locking cylinder manualemergency operating device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103899594B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832473B (en) * | 2015-03-31 | 2017-03-15 | 东南大学 | A kind of portable emergency operation device and its method of operating suitable for leveling locking cylinder |
| CN110905872B (en) * | 2019-11-15 | 2021-11-02 | 湖北航天技术研究院总体设计所 | Double-cylinder linkage hydraulic circuit based on control over energy accumulator |
| CN112344016B (en) * | 2020-10-26 | 2022-01-18 | 中国第一汽车股份有限公司 | Emergency unlocking parking lock device and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997034093A1 (en) * | 1996-03-13 | 1997-09-18 | Robert Bosch Gmbh | Emergency hydraulic control for continuously variable transmission with expanded manually-operated valve |
| US7114431B1 (en) * | 2005-01-28 | 2006-10-03 | Eaton Corporation | Fluid powered apparatus for operating a mechanism during an emergency |
| CN102733360A (en) * | 2011-04-12 | 2012-10-17 | 高冬 | Emergency operation device and gate system of winch hoist |
| WO2013010390A1 (en) * | 2011-07-15 | 2013-01-24 | 上海三一科技有限公司 | Winding emergency lowering apparatus and crane comprising the same |
| CN203476861U (en) * | 2013-06-21 | 2014-03-12 | 中联重科股份有限公司 | Emergency power system, and hoisting mechanism and hoisting equipment comprising same |
-
2014
- 2014-03-25 CN CN201410114929.7A patent/CN103899594B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997034093A1 (en) * | 1996-03-13 | 1997-09-18 | Robert Bosch Gmbh | Emergency hydraulic control for continuously variable transmission with expanded manually-operated valve |
| US7114431B1 (en) * | 2005-01-28 | 2006-10-03 | Eaton Corporation | Fluid powered apparatus for operating a mechanism during an emergency |
| CN102733360A (en) * | 2011-04-12 | 2012-10-17 | 高冬 | Emergency operation device and gate system of winch hoist |
| WO2013010390A1 (en) * | 2011-07-15 | 2013-01-24 | 上海三一科技有限公司 | Winding emergency lowering apparatus and crane comprising the same |
| CN203476861U (en) * | 2013-06-21 | 2014-03-12 | 中联重科股份有限公司 | Emergency power system, and hoisting mechanism and hoisting equipment comprising same |
Non-Patent Citations (1)
| Title |
|---|
| 一种带辅助支撑的大载荷内胀式机械锁紧液压缸;孙利生;《液压与气动》;20040831(第8期);第61－62页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103899594A (en) | 2014-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103603975B (en) | Multistage hydraulic cylinder | |
| CN102032238B (en) | External control type self-locking hydraulic cylinder | |
| CN207634411U (en) | A kind of piping lane Electrohydraulic push rod and its hydraulic circuit system | |
| CN205639109U (en) | Hydraulic hoist machine with manual emergency device of energy storage formula | |
| CN201982411U (en) | External control type self-locking hydraulic cylinder | |
| CN206035914U (en) | Four jar synchronous hydraulic system of automobile elevator | |
| CN103899594B (en) | Internal expansion type locking cylinder manualemergency operating device and method | |
| CN202381448U (en) | Hydraulic oil cylinder and hydraulic system | |
| CN103836015B (en) | The control system of Elevating platform fire truck and supporting leg Vertical Cylinders thereof | |
| CN104444866B (en) | The control system of telescoping mechanism and there is its crane | |
| CN204003683U (en) | A kind of hydraulic system and engineering machinery | |
| CN203890972U (en) | Hydraulic arc-shaped lifting dam | |
| CN209469634U (en) | A kind of double amplitude oil cylinder synchronous hydraulic control systems | |
| CN111022420A (en) | Integrated mechanical locking hydraulic cylinder and system | |
| CN105317766A (en) | Integrated hydraulic open-close machine | |
| CN103899598B (en) | Internal expansion type locking cylinder manual-operated emergent tripper and method | |
| CN106762883A (en) | Hydraulic system and tower crane | |
| CN102887432A (en) | Electro-hydraulic integrated driver for rotary pin of container hanging tool | |
| CN202916139U (en) | Hydraulic system for pipe fitting testing | |
| CN203868019U (en) | Static loading protection module | |
| CN206054411U (en) | The hydraulic control system and single-cylinder bolt type telescopic boom of single-cylinder bolt type telescopic boom | |
| CN202745387U (en) | Supporting leg control system and concrete pumping equipment | |
| CN205225903U (en) | A chamber door safety is opened and closed hydraulic means for compression rubbish equipment | |
| CN205779965U (en) | A kind of hydraulic control system of hydraulic dumping device | |
| CN204878101U (en) | Take off -load valve core to let out formula hydraulic pressure lock valve device in |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20190325 |