CN202381429U - Forward jumping prevention control valve of crane telescopic oil cylinder and crane telescopic system - Google Patents
Forward jumping prevention control valve of crane telescopic oil cylinder and crane telescopic system Download PDFInfo
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- CN202381429U CN202381429U CN2011205243815U CN201120524381U CN202381429U CN 202381429 U CN202381429 U CN 202381429U CN 2011205243815 U CN2011205243815 U CN 2011205243815U CN 201120524381 U CN201120524381 U CN 201120524381U CN 202381429 U CN202381429 U CN 202381429U
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Abstract
The utility model discloses a forward jumping prevention control valve of a crane telescopic oil cylinder. The valve disclosed by the utility model is integrated with a cartridge inserted valve and a reversal valve, wherein a valve body is provided with a first oil port, a second oil port and a third oil port; the first oil port is an oil inlet and is communicated with an oil port at the end face of the cartridge inserted valve; the second oil port is an oil return port and is communicated with an oil port at the ring surface of the cartridge inserted valve; the third oil port is an oil drain port; and the reversal valve is provided with a first oil port, a second oil port and a third oil port, the first oil port is communicated with a spring cavity of the cartridge inserted valve, the second oil port and the third oil port are respectively communicated with the oil drain port, and the oil way of the third oil port is provided with a backpressure component. The control valve disclosed by the utility model can provide effective backpressure for the telescopic oil cylinder; flow can pass at a full speed without pressure loss when the telescopic oil cylinder extends outward normally; and simultaneously, under a high pressure state, the telescopic oil cylinder can be prevented from detonation, and the cost is relatively low. The utility model further discloses a crane telescopic system provided with the control valve.
Description
Technical field
The utility model relates to technical field of engineering machinery, and particularly the telescopic oil cylinder of middle hoister in large tonnage is scurried control valve before preventing.The utility model also relates to the crane telescopic system that is provided with said control valve.
Background technique
In recent years; Requiring of the operation height of city's field alignment hoister in large tonnage and lifting performance is increasingly high; To this; Crane arm must become six joint arms by five traditional joint arms, and traditional twin-tub rope row formula telescopic system can't satisfy the flexible requirement of six joint arms, and a kind of preferable solution is to adopt the single-cylinder bolt telescopic system.
The single-cylinder bolt telescopic system can be realized the flexible of the above telescopic boom of five joints, and own wt is lighter, can make hoist have higher operation height and lift heavy performance, and its application on hoister in large tonnage is comparatively extensive.
For the application with the single-cylinder bolt telescopic system extends to middle hoister in large tonnage, promptly on the automatically controlled valve control system of load-sensitive, use the single-cylinder bolt telescopic system, need to solve a key technical problem, the control of promptly scurrying before the telescopic oil cylinder.
Middle hoister in large tonnage adopts load-sensitive variable displacement pump automatical control system basically; Thereby realize the control of crane job speed through the electric current of control multi-way valve; Be valve control system, if direct application single-cylinder bolt telescopic system, when arm during at Low angle; Can occur overhangingly automatically stopping problem incessantly, cause telescopic oil cylinder excessively to stretch out and break telescopic oil cylinder head and semi-girder slide block with oil cylinder.
Please refer to Fig. 1, Fig. 1 is the telescopic oil cylinder of single cylinder bolt-type telescopic system and the oil circuit schematic representation of its inner core pipe.
As shown in the figure; The driving force of scurrying before the telescopic oil cylinder is by the internal structure of telescopic oil cylinder and the form decision of single-cylinder bolt telescopic system, and hydraulic oil control is adopted in the cylinder pin oil cylinder of single-cylinder bolt telescopic system, the control of arm pin oil cylinder, and the fuel feeding of its hydraulic oil source adopts telescopic oil cylinder inner core tubular construction fuel feeding; One end of core pipe 3 links to each other with cylinder barrel 1; The other end links to each other with piston rod 2, and when telescopic oil cylinder stretched, it was flexible to drive core pipe 3.
Otherwise; When control cylinder pin oil cylinder or arm pin oil cylinder, be full of pressure oil in the core pipe 3, this pressure oil will produce hydraulic action on the ring surface of core pipe; Make inside and outside two-part of core pipe 3 produce the driving force that unplugs each other, and then drive the cylinder barrel 1 and piston rod 2 generation relative movement of telescopic oil cylinder.
For preventing to scurry before the telescopic oil cylinder; Then must produce a resistance, scurry driving force before going to offset, the technological scheme of employing is when not needing telescopic oil cylinder to move ahead; Cut off the oil return of telescopic oil cylinder rod chamber; Make the rod chamber of telescopic oil cylinder produce certain oil pressure (being back pressure), form a reaction force, scurry before the prevention telescopic oil cylinder.
Please refer to Fig. 2, Fig. 2 is the local hydraulic schematic diagram of a kind of typical crane telescopic system in the existing technology.
As shown in the figure, this hydraulic system is a pump control system, and crane job speed is controlled through the discharge capacity of regulator solution press pump, and the rod chamber oil circuit of its telescopic oil cylinder 4 is provided with scurries valve piece 5 before a part is prevented.
For reaching the good energy-conservation requirement; Reduce the pressure loss of telescopic system in telescopic process as far as possible, scurry valve piece 5 before preventing and adopt the logic cartridge valves, its anchor ring hydraulic fluid port is communicated with the rod chamber of telescopic oil cylinder 4; The end face hydraulic fluid port is communicated with main valve 6, can produce the back pressure of about 3MPa.
The foundation of above-mentioned back pressure force value will rely on the spring of cartridge valve and the operation power on the anchor ring to balance each other and realize.But; When telescopic crane boom is normally stretched motion; Cartridge valve is opened, then must be produced the pressure of 3MPa on the anchor ring of cartridge valve, the pressure of its end face hydraulic fluid port A changes with the opening of main valve; Force value is 0.8MPa when the big opening of spool, and then cartridge valve must lose the pressure of 2.2MPa at work.
Secondly, under high pressure conditions, when peripheral condition lost efficacy; Thisly scurry the valve piece before anti-and do not have the function that prevents the oil cylinder explosion, have the risk of telescopic oil cylinder explosion, telescopic oil cylinder is large-scale executive component; Its cost is very expensive, in case explosion will bring serious economy loss.
Moreover this mode is higher to the requirement on machining accuracy of cartridge valve, and the substandard products that cause meeting the demands fully are more, and manufacture cost maintains higher level all the time.
Therefore, under the prerequisite that effective back pressure can be provided, how to make telescopic oil cylinder normal when overhanging; Flow can be at full speed through and do not produce the pressure loss; Simultaneously, under high pressure conditions, can prevent the telescopic oil cylinder explosion; And cost is relatively low, is the present technical issues that need to address of those skilled in the art.
The model utility content
First purpose of the utility model provides scurries control valve before a kind of crane telescopic oil cylinder is prevented.This control valve not only can provide effective back pressure for telescopic oil cylinder, and normal when overhanging at telescopic oil cylinder, flow can be at full speed through and do not produce the pressure loss, simultaneously, under high pressure conditions, can prevent the telescopic oil cylinder explosion, and cost is relatively low.
Second purpose of the utility model provides a kind of crane telescopic system that is provided with said control valve.
In order to realize above-mentioned first purpose, the utility model is scurried control valve before providing a kind of crane telescopic oil cylinder anti-, and this valve is integrated with cartridge valve and selector valve, and its valve body has first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port;
Said first hydraulic fluid port is a filler opening, is communicated with the end face hydraulic fluid port of said cartridge valve; Said second hydraulic fluid port is a return opening, is communicated with the anchor ring hydraulic fluid port of said cartridge valve; Said the 3rd hydraulic fluid port is a drain tap;
Said selector valve has first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port, and wherein first hydraulic fluid port is communicated with the spring chamber of said cartridge valve, and second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with said drain tap respectively, and the oil circuit of the 3rd hydraulic fluid port is provided with back pressure member;
Said selector valve has two working positions: in first working position, its first hydraulic fluid port is communicated with second hydraulic fluid port; In second working position, its first hydraulic fluid port is communicated with the 3rd hydraulic fluid port.
Preferably, said back pressure member is a relief valve.
Preferably, said relief valve is specially direct-acting overflow valve.
Preferably, said back pressure member is damping.
Preferably, said damping comprises first damping and second damping of mutual series connection.
Preferably, said first damping is the damping of φ 0.8, and said second damping is the damping of φ 0.6.
Preferably, the spool of said cartridge valve is provided with the oil circuit that is communicated with its end face hydraulic fluid port and spring chamber, and on this oil circuit, is provided with internal damping.
Preferably, said valve body further is provided with the 4th hydraulic fluid port and the 5th hydraulic fluid port; Said the 4th hydraulic fluid port is the first pressure measurement hydraulic fluid port, is communicated with the end face hydraulic fluid port of said cartridge valve; Said the 5th hydraulic fluid port is the second pressure measurement hydraulic fluid port, is communicated with the anchor ring hydraulic fluid port of said cartridge valve.
Preferably, said selector valve is the two-position three way solenoid directional control valve.
For realizing above-mentioned second purpose; The utility model also provides a kind of crane telescopic system; Comprise telescopic oil cylinder, main valve and anti-before scurry control valve; Said filler opening of scurrying control valve before anti-is communicated with the rod chamber of said telescopic oil cylinder, and said return opening of scurrying control valve before anti-is communicated with said main valve, and said to scurry control valve before preventing be to scurry control valve before above-mentioned each described crane telescopic oil cylinder is prevented.
Scurry control valve before the crane telescopic oil cylinder that the utility model provided is anti-and be integrated with cartridge valve and selector valve; Its valve body has first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port; Wherein first hydraulic fluid port is a filler opening, is communicated with the end face hydraulic fluid port of cartridge valve, and second hydraulic fluid port is a return opening; Be communicated with the anchor ring hydraulic fluid port of cartridge valve, the 3rd hydraulic fluid port is a drain tap.
During use, first hydraulic fluid port connects the rod chamber of telescopic oil cylinder, and second hydraulic fluid port connects the main valve of telescopic oil cylinder; Can between back pressure state and non-back pressure state, switch through selector valve, at telescopic oil cylinder starting, stop phase, this valve is in the back pressure state; Certain back pressure value can be provided for the rod chamber of telescopic oil cylinder, guarantee that telescopic oil cylinder can be not overhanging automatically and can in time stop, in the normal arm-stretching exercise of telescopic oil cylinder; This valve is in non-back pressure state, and hydraulic oil can pass through at full speed, can not cause extra restriction loss; The pressure loss is less, and energy-saving effect is remarkable.
In addition, this valve is relatively low to the requirement on machining accuracy of cartridge valve, can effectively reduce manufacture cost, and needn't change other hydraulic element in the telescopic system.
In a kind of embodiment, the spool of said cartridge valve is provided with the oil circuit that is communicated with its end face hydraulic fluid port and spring chamber, and on this oil circuit, is provided with internal damping.This employing damping network form is set up the mode of back pressure; Under the ultrahigh pressure state, can before and after spool, produce bigger pressure reduction through cartridge valve internal damping, first damping and second damping, the product that makes cartridge valve spring chamber pressure and area is less than the pressure of end face and the product of face area; Thereby cartridge valve is opened automatically; When foxing spare lost efficacy outside, can carry out safety protection, avoid the telescopic oil cylinder explosion telescopic oil cylinder.
The crane telescopic system that the utility model provided is provided with scurries control valve before above-mentioned crane telescopic oil cylinder is prevented; Have above-mentioned technique effect owing to scurry control valve before above-mentioned crane telescopic oil cylinder is anti-, the crane telescopic system that is provided with this control valve also should possess the corresponding techniques effect.
Description of drawings
Fig. 1 is the telescopic oil cylinder of single cylinder bolt-type telescopic system and the oil circuit schematic representation of its inner core pipe;
Fig. 2 is the local hydraulic schematic diagram of a kind of typical crane telescopic system in the existing technology;
Fig. 3 is the hydraulic schematic diagram of scurrying a kind of embodiment of control valve before the utility model provides the crane telescopic oil cylinder anti-;
Fig. 4 is the hydraulic schematic diagram of scurrying the another kind of embodiment of control valve before the utility model provides the crane telescopic oil cylinder anti-;
Fig. 5 scurries the local hydraulic schematic diagram that control valve is applied to telescopic system before the utility model provides the crane telescopic oil cylinder anti-.
Among Fig. 1 to Fig. 2:
1. scurry valve piece 6. main valves before cylinder barrel 2. piston rods 3. core pipes 4. telescopic oil cylinders 5. are prevented
Among Fig. 3 to Fig. 5:
10. valve body 20. cartridge valves 30. selector valves 40. relief valves 50. internal dampings 60. first dampings 70. second dampings 80. telescopic oil cylinders 90. main valves
Embodiment
The core of the utility model provides scurries control valve before a kind of crane telescopic oil cylinder is prevented.This control valve not only can provide effective back pressure for telescopic oil cylinder, and normal when overhanging at telescopic oil cylinder, flow can be at full speed through and do not produce the pressure loss, simultaneously, under high pressure conditions, can prevent the telescopic oil cylinder explosion, and cost is relatively low.
Another core of the utility model provides a kind of crane telescopic system that is provided with said control valve.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is done further to specify below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 3, Fig. 3 is the hydraulic schematic diagram of scurrying a kind of embodiment of control valve before the utility model provides the crane telescopic oil cylinder anti-.
In a kind of embodiment, the control valve that the utility model provides is an integrated valve, and this valve is integrated with cartridge valve 20 and selector valve 30, has the first hydraulic fluid port A, the second hydraulic fluid port B, the 3rd hydraulic fluid port Y, the 4th hydraulic fluid port MA and the 5th hydraulic fluid port MB on its valve body 10.
The first hydraulic fluid port A is a filler opening, is communicated with the end face hydraulic fluid port of cartridge valve 20; The second hydraulic fluid port B is a return opening, is communicated with the anchor ring hydraulic fluid port of cartridge valve 20; The 3rd hydraulic fluid port Y is a drain tap, connects leakage device, as leaking header pipe, last oil sump tank; The 4th hydraulic fluid port MA and the 5th hydraulic fluid port MB are respectively the first pressure measurement hydraulic fluid port and the second pressure measurement hydraulic fluid port, are used to connect pressure measuring tie-in, and the 4th hydraulic fluid port MA is communicated with the end face hydraulic fluid port of cartridge valve 20, and the 5th hydraulic fluid port MB is communicated with the anchor ring hydraulic fluid port of cartridge valve 20.
The spool 20-1 of cartridge valve 20 is provided with the oil circuit that is communicated with its end face hydraulic fluid port and spring chamber, and on this oil circuit, is provided with internal damping 50.
Control valve has back pressure and two kinds of working staties of non-back pressure, switches through selector valve 30:
When the work of position, selector valve 30 left side; The spring chamber of cartridge valve 20 is communicated with the 3rd hydraulic fluid port Y of valve body 10 through selector valve 30, and at this moment, control valve is in non-back pressure state; The hydraulic oil that gets into cartridge valve 20 end face hydraulic fluid ports from the first hydraulic fluid port A only need overcome the pressure of spring and can cartridge valve be opened; Its flow can pass through the second hydraulic fluid port B at full speed, produces the pressure loss hardly, thereby guarantees that telescopic boom can be normally overhanging.
When work in selector valve 30 right positions; The spring chamber of cartridge valve 20 is communicated with the 3rd hydraulic fluid port Y of valve body 10 through selector valve 30; At this moment; Control valve is in the back pressure state, and the hydraulic oil that gets into cartridge valve 20 end face hydraulic fluid ports from the first hydraulic fluid port A need overcome the pressure of spring and the setting pressure of relief valve 40 could be opened cartridge valve, thereby certain back pressure value is provided for telescopic oil cylinder.
With hundred tonnes of truck cranes is example, and its telescopic oil cylinder cylinder diameter is 160mm, and the piston rod bar directly is 140mm.According to the telescopic oil cylinder inner structure size; The size of scurrying driving force before can calculating is about 12717N; The back pressure that then needs is 2.7MPa; Consider influences such as frictional force, pressure loss in piping (pressing 0.3MPa estimates), the final back pressure value of confirming is 3MPa, so the setting pressure of relief valve 40 is 3MPa.
Please refer to Fig. 4, Fig. 4 is the hydraulic schematic diagram of scurrying the another kind of embodiment of control valve before the utility model provides the crane telescopic oil cylinder anti-.
In another kind of embodiment; The control valve that the utility model provides is an integrated valve; This valve is integrated with cartridge valve 20 and selector valve 30, has the first hydraulic fluid port A, the second hydraulic fluid port B, the 3rd hydraulic fluid port Y, the 4th hydraulic fluid port MA and the 5th hydraulic fluid port MB on its valve body 10, and is structurally basic identical with above-mentioned first kind of embodiment; Difference just is that its back pressure member is damping.
Damping comprises first damping 60 and second damping 70 of mutual series connection; The key of this control mode is how to choose the size of damping hole; If the back pressure value that needs is 3MPa; Through the calculating of hydraulic damping network, confirm that finally first damping 60 is the damping of φ 0.8, second damping 70 is the damping of φ 0.6.
This employing damping network form is set up the mode of back pressure; Under the ultrahigh pressure state, can be through internal damping 50, first damping 60 and second damping 70 of cartridge valve 20 at the bigger pressure reduction of spool front and back generation, the product that makes cartridge valve 20 spring chamber pressure and area is less than the pressure of end face and the product of face area; Thereby cartridge valve 20 is opened automatically; When foxing spare lost efficacy outside, can carry out safety protection, avoid the telescopic oil cylinder explosion telescopic oil cylinder.
For the mode that employing relief valve 40 carries out back pressure, the influence of factors such as the former receives, and factory setting is defective, the random adjustment of user can cause contingency, possesses higher Hydraulic System Reliability and adopt damping to carry out back pressure.In addition, its Costco Wholesale is also lower.
Control valve among the above embodiment is in the back pressure state at telescopic oil cylinder starting, stop phase; Certain back pressure value can be provided for the rod chamber of telescopic oil cylinder, guarantee that telescopic oil cylinder can be not overhanging automatically and can in time stop, in the normal arm-stretching exercise of telescopic oil cylinder, being in non-back pressure state; Hydraulic oil can pass through at full speed; Can not cause extra restriction loss, the pressure loss is less, and energy-saving effect is remarkable.
In addition, this control valve is relatively low to the requirement on machining accuracy of cartridge valve, can effectively reduce manufacture cost, and needn't change other hydraulic element in the telescopic system.
Above-mentioned control valve only is a kind of preferred version, specifically is not limited thereto, and can make pointed adjustment according to actual needs on this basis, thereby obtain different embodiment.For example, adopt other selector valve to replace two-position three way magnetic valve or the like.Because mode in the cards is more, just illustrate no longer one by one here.
Please refer to Fig. 5, Fig. 5 scurries the local hydraulic schematic diagram that control valve is applied to telescopic system before the utility model provides the crane telescopic oil cylinder anti-.
Except above-mentioned crane telescopic oil cylinder is scurried control valve before anti-; The utility model also provides a kind of crane telescopic system, comprise telescopic oil cylinder, main valve and anti-before scurry control valve, the said control valve of scurrying before anti-is that above-mentioned crane telescopic oil cylinder is scurried control valve before anti-; The first hydraulic fluid port A of its valve body 10 is communicated with the rod chamber of telescopic oil cylinder 80; The second hydraulic fluid port B of valve body 10 is communicated with main valve 90, and all the other structures please refer to existing technology, and this paper repeats no more.
More than crane telescopic oil cylinder that the utility model provided is scurried control valve before anti-and telescopic system has carried out detailed introduction.Used concrete example among this paper the principle and the mode of execution of the utility model are set forth, above embodiment's explanation just is used to help to understand the core concept of the utility model.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. scurry control valve before a crane telescopic oil cylinder is prevented, it is characterized in that this valve is integrated with cartridge valve and selector valve, its valve body has first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port;
Said first hydraulic fluid port is a filler opening, is communicated with the end face hydraulic fluid port of said cartridge valve; Said second hydraulic fluid port is a return opening, is communicated with the anchor ring hydraulic fluid port of said cartridge valve; Said the 3rd hydraulic fluid port is a drain tap;
Said selector valve has first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port, and wherein first hydraulic fluid port is communicated with the spring chamber of said cartridge valve, and second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with said drain tap respectively, and the oil circuit of the 3rd hydraulic fluid port is provided with back pressure member;
Said selector valve has two working positions: in first working position, its first hydraulic fluid port is communicated with second hydraulic fluid port; In second working position, its first hydraulic fluid port is communicated with the 3rd hydraulic fluid port.
2. scurry control valve before crane telescopic oil cylinder according to claim 1 is anti-, it is characterized in that said back pressure member is a relief valve.
3. scurry control valve before crane telescopic oil cylinder according to claim 2 is anti-, it is characterized in that said relief valve is specially direct-acting overflow valve.
4. scurry control valve before crane telescopic oil cylinder according to claim 1 is anti-, it is characterized in that said back pressure member is damping.
5. scurry control valve before crane telescopic oil cylinder according to claim 4 is anti-, it is characterized in that said damping comprises first damping and second damping of mutual series connection.
6. scurry control valve before crane telescopic oil cylinder according to claim 5 is anti-, it is characterized in that said first damping is the damping of φ 0.8, said second damping is the damping of φ 0.6.
7. scurry control valve before preventing according to each described crane telescopic oil cylinder of claim 1 to 6, it is characterized in that the spool of said cartridge valve is provided with the oil circuit that is communicated with its end face hydraulic fluid port and spring chamber, and on this oil circuit, is provided with internal damping.
8. scurry control valve before crane telescopic oil cylinder according to claim 7 is anti-, it is characterized in that said valve body further is provided with the 4th hydraulic fluid port and the 5th hydraulic fluid port; Said the 4th hydraulic fluid port is the first pressure measurement hydraulic fluid port, is communicated with the end face hydraulic fluid port of said cartridge valve; Said the 5th hydraulic fluid port is the second pressure measurement hydraulic fluid port, is communicated with the anchor ring hydraulic fluid port of said cartridge valve.
9. scurry control valve before preventing according to each described crane telescopic oil cylinder of claim 1 to 6, it is characterized in that said selector valve is the two-position three way solenoid directional control valve.
10. crane telescopic system; Comprise telescopic oil cylinder, main valve and anti-before scurry control valve; Said filler opening of scurrying control valve before anti-is communicated with the rod chamber of said telescopic oil cylinder; Said return opening of scurrying control valve before anti-is communicated with said main valve, it is characterized in that, said to scurry control valve before preventing be to scurry control valve before aforesaid right requirement 1 to 9 each described crane telescopic oil cylinder is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205243815U CN202381429U (en) | 2011-12-14 | 2011-12-14 | Forward jumping prevention control valve of crane telescopic oil cylinder and crane telescopic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205243815U CN202381429U (en) | 2011-12-14 | 2011-12-14 | Forward jumping prevention control valve of crane telescopic oil cylinder and crane telescopic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202381429U true CN202381429U (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205243815U Expired - Fee Related CN202381429U (en) | 2011-12-14 | 2011-12-14 | Forward jumping prevention control valve of crane telescopic oil cylinder and crane telescopic system |
Country Status (1)
| Country | Link |
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| CN (1) | CN202381429U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788057A (en) * | 2012-08-27 | 2012-11-21 | 徐州重型机械有限公司 | Device for preventing cylinder from moving forwards and crane |
| CN103420290A (en) * | 2013-07-25 | 2013-12-04 | 三一汽车起重机械有限公司 | Telescopic protection system and crane |
| CN108190748A (en) * | 2018-01-02 | 2018-06-22 | 三汽车起重机械有限公司 | A kind of single-cylinder bolt telescopic system and crane |
| CN108612698A (en) * | 2018-06-25 | 2018-10-02 | 圣邦集团有限公司 | A kind of luffing control valve for big flow speed control system with adjustable displacement |
-
2011
- 2011-12-14 CN CN2011205243815U patent/CN202381429U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788057A (en) * | 2012-08-27 | 2012-11-21 | 徐州重型机械有限公司 | Device for preventing cylinder from moving forwards and crane |
| CN103420290A (en) * | 2013-07-25 | 2013-12-04 | 三一汽车起重机械有限公司 | Telescopic protection system and crane |
| CN103420290B (en) * | 2013-07-25 | 2015-06-10 | 三一汽车起重机械有限公司 | Telescopic protection system and crane |
| CN108190748A (en) * | 2018-01-02 | 2018-06-22 | 三汽车起重机械有限公司 | A kind of single-cylinder bolt telescopic system and crane |
| CN108612698A (en) * | 2018-06-25 | 2018-10-02 | 圣邦集团有限公司 | A kind of luffing control valve for big flow speed control system with adjustable displacement |
| CN108612698B (en) * | 2018-06-25 | 2024-03-08 | 圣邦集团有限公司 | Amplitude-variable control valve for large-flow volume speed regulation system |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20120815 Termination date: 20201214 |