CN202322125U - Hydraulic control system with adjustable amplitude for articulated lifting device - Google Patents
Hydraulic control system with adjustable amplitude for articulated lifting device Download PDFInfo
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- CN202322125U CN202322125U CN2011204042698U CN201120404269U CN202322125U CN 202322125 U CN202322125 U CN 202322125U CN 2011204042698 U CN2011204042698 U CN 2011204042698U CN 201120404269 U CN201120404269 U CN 201120404269U CN 202322125 U CN202322125 U CN 202322125U
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Abstract
The utility model relates to a hydraulic control system with an adjustable amplitude for an articulated lifting device. The hydraulic control system comprises an oil pump connected with an oil tank, wherein the outlet end of the oil pump is connected with a reversing valve; the reversing valve comprises two reversing ports which are communicated with the rod chamber and the rodless cavity of an oil cylinder respectively; a balance valve is arranged between the rodless cavity of the oil cylinder and the reversing valve; a speed control valve is also arranged between the reversing valve and the oil cylinder; one end of the speed control valve is communicated with an oil circuit between the reversing valve and the oil cylinder; and the other end of the speed control valve is communicated with the oil tank. As the balance valve and the speed control valve are combined during use, that is, the speed control valve is arranged in a balance oil circuit comprising the balance valve, when the opening degree of the balance valve is adjusted properly, the pressure in the oil circuit of the upper cavity of a hydraulic cylinder is guaranteed to be in such a state that the pressure can keep the balance valve open during the lowering process of a load, so as to avoid shake and noise caused by the frequent opening and closing of the balance valve during the lowering process of the load, and influence on the stability of the hydraulic control system.
Description
Technical field
The utility model relates to a kind of hydraulic control system, and the luffing hydraulic control system is hung in particularly a kind of joint.
Background technology
In the prior art, common balanced loop comprises following several kinds:
One, the balanced loop of one way sequence valve
As shown in Figure 1, adopting the balanced loop of one way sequence valve 101 is the modal a kind of forms in the derricking cylinder field of hanging in the joint, and wherein, the change-over valve 102 that hang in the luffing hydraulic efficiency pressure system in joint commonly used is the proportional reversing valve of O type meta function.The P mouth of change-over valve 101 is communicated with the mouth of oil pump 104; The O mouth of change-over valve is communicated with fuel tank 105; The A mouth of change-over valve 101 and B mouth are communicated with the rodless cavity and the rod chamber of hydraulic actuating cylinder 103 respectively, between the rodless cavity of the A of change-over valve mouth and hydraulic actuating cylinder 103, are provided with one way sequence valve 101.
Control is mainly realized through change-over valve 102 and one way sequence valve 101 in the balanced loop of one way sequence valve 101; Through regulating the response pressure of one way sequence valve 101; The back pressure that makes its response pressure be a bit larger tham hydraulic actuating cylinder 103 rodless cavities makes piston when descending, has certain back pressure on the balanced loop; Be used to support gravity load, piston is steadily fallen; When change-over valve 102 is in meta, the piston stop motion.But there is following weak point in the balanced loop of adopting one way sequence valve and change-over valve to form:
1. owing on the loop back pressure is arranged, loss in efficiency is bigger;
2. under anxious situation of stopping, impact very greatly, may cause damage to oil cylinder and structure, influence the service life of equipment; When especially adopting the proportional reversing valve of O type meta function to hang the luffing hydraulic control system,, very easily oil cylinder is caused damage under the emergency stop because of the hydraulic efficiency impact that motional inertia causes of glancing impact piston is bigger as the joint.
Two, the balanced loop of hydraulic control one-way valve
Adopt the balanced loop of hydraulic control one-way valve, because hydraulic control one-way valve is a conical surface seal, spillage is little; So its latch performance is good, piston is can the long period slack, but its weak point is: hydraulic control one-way valve is opened by the control oil on the in-line during descent of piston; Oil back chamber does not have back pressure, and movable parts causes hydraulic actuating cylinder epicoele fuel feeding not enough owing to deadweight is quickened to descend; Hydraulic control one-way valve is closed because of the control oil channel decompression, closes the back control oil channel and sets up pressure again, and be opened once more; Therefore close when opening during hydraulic control one-way valve, make piston in moving downward process, produce vibration and impact.
In addition; Existing joint is hung the derricking cylinder hydraulic control system and is lacked emergent lowering function usually, when pumping source breaks down, for putting down being suspended in aerial drilling tool; Principal arm, the auxiliary that need hang at the cooperation hypozygal of other external force could slowly lower, and it is cumbersome to operate.
The utility model content
The technical matters that the utility model will solve is to overcome the above-mentioned deficiency of prior art, provides a kind of and can reduce impact, avoids causing the joint of damage to hang the luffing hydraulic control system because of anxious situation such as stop to oil cylinder;
Another goal of the invention of the utility model provides a kind of joint with emergent lowering function and hangs the luffing hydraulic control system, when pumping source breaks down, can fall the principal arm, the auxiliary that hang in the joint easily, and aerial drilling tool is emergent transfers being suspended in.
For solving the problems of the technologies described above; The utility model provides following technical scheme: the luffing hydraulic control system is hung in a kind of joint, comprises the oil pump that links to each other with fuel tank, and the mouth of said oil pump is connected with change-over valve; Said change-over valve comprises two switching-over mouths; Two switching-over mouths of said change-over valve are communicated with the rod chamber and the rodless cavity of oil cylinder respectively, are provided with balance cock between the rodless cavity of said oil cylinder and the change-over valve, also are provided with governor valve between said change-over valve and the oil cylinder; One end of said governor valve is communicated to the oil circuit between change-over valve and the oil cylinder, and the other end of said governor valve is communicated with fuel tank; The mode that adopts the combination of balance cock and governor valve to use promptly is provided with governor valve in the balance oil circuit of being made up of balance cock, suitably the aperture of adjustment valve; In the proof load decline process; All the time there is the pressure that can make balance cock be in opening in the hydraulic pressure epicoele oil circuit, thereby avoids loading in the decline process, close when opening during balance cock; And produce vibrations and noise, influence control system stability.
Hang in the luffing hydraulic control system in above-mentioned joint, also is provided with manual pump on the said balance cock, and the input end of said manual pump is communicated with fuel tank, and said manual delivery side of pump is communicated with the controlled end of balance cock.When pumping source breaks down; And drilling tool just in time is suspended in when aerial; Can carry high-voltage oil liquid to the controlled end of balance cock through manual pump, the primary valve of balance cock is opened, make that the fluid in the rodless cavity of oil cylinder is back to fuel tank; Thereby make the joint hang emergent decline, have simple in structure and easy to operate beneficial effect.
Hang in the luffing hydraulic control system in above-mentioned joint, and said change-over valve is a multiple directional control valve, and said multiple directional control valve is provided with first change-over valve and second change-over valve, and said oil cylinder comprises principal arm oil cylinder and auxiliary oil cylinder; Two switching-over mouths of said first change-over valve are communicated with the rod chamber and the rodless cavity of principal arm oil cylinder respectively; Be provided with first balance cock between the rodless cavity of said first change-over valve and principal arm oil cylinder; Be provided with first governor valve between the rodless cavity of said first change-over valve and principal arm oil cylinder, be provided with second governor valve between the rod chamber of said first change-over valve and principal arm oil cylinder; Two switching-over mouths of said second change-over valve are communicated with the rod chamber and the rodless cavity of auxiliary oil cylinder respectively; Be provided with second balance cock between the rodless cavity of said second change-over valve and auxiliary oil cylinder; Be provided with the 3rd governor valve between the rodless cavity of said second change-over valve and auxiliary oil cylinder, be provided with the 4th governor valve between the rod chamber of said second change-over valve and auxiliary oil cylinder.Adopt such structure, regulate and control through principal arm oil cylinder and auxiliary oil cylinder that multiple directional control valve hangs the joint, simple in structure, integrated level is high.
Preferably; Said oil pump is a load sensitive pump; Said multiway valve is the load-sensitive multiple directional control valve; Said load sensitive pump comprises pressure hydraulic fluid port and control port, and the pressure hydraulic fluid port of said load sensitive pump is communicated with the main oil inlet of load-sensitive multiple directional control valve, and the control port of said load sensitive pump is communicated with the load-sensing oil circuit of load-sensitive multiple directional control valve.Adopt the responsive multiple directional control valve of negative pressure to combine with the responsive pump of negative pressure, the flow that the responsive pump of negative pressure is exported is the required flow of the responsive multiple directional control valve of negative pressure, does not have the extra flow loss, therefore practices thrift flow more.
Preferably, also be provided with the 3rd balance cock between the rod chamber of said second change-over valve and auxiliary oil cylinder, the controlled end of said the 3rd balance cock is communicated to the oil circuit between second change-over valve and second balance cock.Second balance cock and the 3rd balance cock are collaborative controlled, the collaborative up-down of principal arm oil cylinder and auxiliary oil cylinder, and operation is more steady simultaneously.
Preferably, be provided with first shuttle valve between the rod chamber of said manual pump and principal arm oil cylinder, be provided with second shuttle valve between the rod chamber of said manual pump and auxiliary oil cylinder.Through shuttle valve is set, make the controlled point of balance cock opened and closed by the cylinder rod chamber effect.
Preferably, be provided with first safety valve between the said manual delivery side of pump and first shuttle valve, be provided with second safety valve between the rod chamber of said auxiliary oil cylinder and the 3rd balance cock, the mouth of said first safety valve and second safety valve all is communicated with fuel tank.Through safety valve is set, can avoid the pressure rising De Taigao of fluid, reduced impact.
Compared with prior art, the beneficial effect of the utility model is: the mode that adopts the combination of balance cock and governor valve to use promptly is provided with governor valve in the balance oil circuit of being made up of balance cock; Suitably in the proof load decline process, there is the pressure that can make balance cock be in opening in the aperture of adjustment valve all the time in the hydraulic pressure epicoele oil circuit; Thereby avoid loading in the decline process; Close when opening during balance cock, and produce vibrations and noise, influence control system stability.
Description of drawings
Fig. 1 hangs luffing hydraulic control system scheme drawing for a kind of joint of the prior art;
Fig. 2 is the scheme drawing of the hydraulic control system of the utility model;
The structural representation that Fig. 3 hangs for the utility model joint.
Mark among the figure: load sensitive pump-1; Manual pump-2; First safety valve-3a; Second safety valve-3b; Multiple directional control valve-4; First change-over valve-4a; Second change-over valve-4b; First governor valve-5a; Second governor valve-5b; The 3rd governor valve-5c; The 4th governor valve-5d; First balance cock-6a; Second balance cock-6b; The 3rd balance cock-6c; First shuttle valve-7a; Second shuttle valve-7b; Principal arm oil cylinder-8; Auxiliary oil cylinder-9; Fuel tank-10; Principal arm-11; Auxiliary-12.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the utility model is further described.
The embodiment of the utility model is not limited to following examples, all belongs within the protection domain of the utility model in the various variations of making under the prerequisite that does not break away from the utility model aim.
As shown in Figures 2 and 3, a kind of joint of the utility model is hung the luffing hydraulic control system and is comprised fuel tank 10, and the load sensitive pump 1 that links to each other with fuel tank 10; The oil inlet of load sensitive pump 1 is communicated with fuel tank 10; The oil outlet of load sensitive pump 1 is communicated with the oil inlet of multiple directional control valve 4, and the oil outlet of load sensitive pump 1 comprises the control port of load sensitive pump 1 and the pressure hydraulic fluid port of load sensitive pump 1, and multiple directional control valve 4 is the negative pressure sensing multi-way valve; Multiple directional control valve 4 combines with load sensitive pump 1; The flow that load sensitive pump 1 is exported is the required flow of negative pressure sensing multi-way valve, does not have the extra flow loss, therefore practices thrift flow more; The control port of load sensitive pump 1 is communicated with the load-sensing oil circuit of multiple directional control valve 4; The main return opening of multiple directional control valve 4 is communicated with fuel tank 10 through oil return line; Multiple directional control valve 4 is that two valve pieces are combined; In order to handle the motion of a plurality of power elements, multiple directional control valve 4 comprises first change-over valve 4a and second change-over valve 4b in the present embodiment, and first change-over valve 4a switches putting and transfer on the principal arm oil cylinder 8; Second change-over valve 4b is in order to switch putting and transfer on the auxiliary oil cylinder 9, and its concrete oil circuit is following:
The rodless cavity of principal arm oil cylinder 8 and rod chamber are communicated with A hydraulic fluid port and the B hydraulic fluid port of first change-over valve 4a respectively, and promptly the A hydraulic fluid port of first change-over valve 4a is communicated with the A hydraulic fluid port of principal arm oil cylinder 8, and the B hydraulic fluid port of first change-over valve 4a is communicated with the B hydraulic fluid port of principal arm oil cylinder 8; Between the A hydraulic fluid port of the A of first change-over valve 4a hydraulic fluid port and principal arm oil cylinder 8, also be provided with the first balance cock 6a; The import of the first balance cock 6a and outlet are communicated to A mouth, and the A mouth of principal arm oil cylinder 8 of first change-over valve 4a respectively; The control port of the first balance cock 6a is connected with the first shuttle valve 7a; The outlet of the first shuttle valve 7a is communicated with the control port of the first balance cock 6a, and two imports of the first shuttle valve 7a are communicated with the B hydraulic fluid port and the manual pump oil circuit of principal arm oil cylinder 8 respectively.
The rodless cavity of auxiliary oil cylinder 9 and rod chamber are communicated with A hydraulic fluid port and the B hydraulic fluid port of second change-over valve 4b respectively, and promptly the A hydraulic fluid port of second change-over valve 4b is communicated with the A hydraulic fluid port of auxiliary oil cylinder 9, and the B hydraulic fluid port of second change-over valve 4b is communicated with the B hydraulic fluid port of auxiliary oil cylinder 9; Between the A hydraulic fluid port of the A of second change-over valve 4b hydraulic fluid port and auxiliary oil cylinder 9, also be provided with the second balance cock 6b; Between the B hydraulic fluid port of the B of auxiliary oil cylinder 9 hydraulic fluid port and second change-over valve 4b, also be provided with the 3rd balance cock 6c; The import of the second balance cock 6b and outlet are communicated to A mouth, and the A mouth of auxiliary oil cylinder 9 of second change-over valve 4b respectively; The import of the 3rd balance cock 6c and outlet are communicated to B mouth, and the B mouth of auxiliary oil cylinder 9 of second change-over valve 4b respectively; The control port of the second balance cock 6b is connected with the second shuttle valve 7b; The outlet of the second shuttle valve 7b is communicated with the control port of the second balance cock 6b; Two imports of the second shuttle valve 7b respectively with the B hydraulic fluid port of the 3rd balance cock 6c and second change-over valve 4b between oil circuit and manual pump oil circuit be communicated with, the control port of the 3rd balance cock 6c is communicated with the oil inlet of the second balance cock 6b.
The B hydraulic fluid port of auxiliary oil cylinder 9 also is connected with the second safety valve 3b, and the import of the second safety valve 3b is communicated to the B hydraulic fluid port of auxiliary oil cylinder 9 and the oil circuit between the 3rd balance cock 6c, and the outlet of the second safety valve 3b is communicated with drain line, and drain line is communicated to fuel tank 10.
Oil circuit between multiple directional control valve 4 and principal arm oil cylinder 8, the auxiliary oil cylinder 9 is provided with governor valve; Concrete; Governor valve between multiple directional control valve 4 and the principal arm oil cylinder 8 is the first governor valve 5a and the second governor valve 5b that is arranged on first change-over valve 4a; The oil outlet end of the first governor valve 5a and the second governor valve 5b all is communicated to fuel tank 10 through oil return line; The oil inlet of the first governor valve 5a is communicated to the oil circuit between the A hydraulic fluid port of A hydraulic fluid port and principal arm oil cylinder 8 of first change-over valve 4a, and the oil inlet of the second governor valve 5b is communicated to the oil circuit between the B hydraulic fluid port of B hydraulic fluid port and principal arm oil cylinder 8 of first change-over valve 4a;
Governor valve between multiple directional control valve 4 and the auxiliary oil cylinder 9 is the 3rd governor valve 5c and the 4th governor valve 5d that is arranged on second change-over valve 4b; The oil outlet end of the 3rd governor valve 5c and the 4th governor valve 5d all is communicated to fuel tank 10 through oil return line; The oil inlet of the 3rd governor valve 5c is communicated to the oil circuit between the A hydraulic fluid port of A hydraulic fluid port and auxiliary oil cylinder 9 of second change-over valve 4b, and the oil inlet of the 4th governor valve 5d is communicated to the oil circuit between the B hydraulic fluid port of B hydraulic fluid port and auxiliary oil cylinder 9 of second change-over valve 4b.
One end of manual pump oil circuit is communicated with the import of the import of the first shuttle valve 7a and the second shuttle valve 7b; The other end of manual pump oil circuit is communicated with fuel tank 10 through manual pump 2; The manual pump oil circuit of manual pump 2 front ends is connected with the oil return branch road, and promptly the manual pump oil circuit of manual pump 2 front ends is provided with the first safety valve 3a, and the end of the first safety valve 3a is communicated to the manual pump oil circuit; The other end of the first safety valve 3a is communicated to oil return line, and is communicated with fuel tank 10 through oil return line.
Claims (7)
1. the luffing hydraulic control system is hung in a joint; Comprise the oil pump that links to each other with fuel tank (10); The mouth of said oil pump is connected with change-over valve, and said change-over valve comprises two switching-over mouths, and two switching-over mouths of said change-over valve are communicated with the rod chamber and the rodless cavity of oil cylinder respectively; Be provided with balance cock between the rodless cavity of said oil cylinder and the change-over valve; It is characterized in that: also be provided with governor valve between said change-over valve and the oil cylinder, an end of said governor valve is communicated to the oil circuit between change-over valve and the oil cylinder, and the other end of said governor valve is communicated with fuel tank (10).
2. the luffing hydraulic control system is hung in joint according to claim 1; It is characterized in that: also be provided with manual pump (2) on the said balance cock; The input end of said manual pump (2) is communicated with fuel tank (10), and the mouth of said manual pump (2) is communicated with the controlled end of balance cock.
3. the luffing hydraulic control system is hung in joint according to claim 1 and 2; It is characterized in that: said change-over valve is multiple directional control valve (4); Said multiple directional control valve (4) is provided with first change-over valve (4a) and second change-over valve (4b), and said oil cylinder comprises principal arm oil cylinder (8) and auxiliary oil cylinder (9);
Two switching-over mouths of said first change-over valve (4a) are communicated with the rod chamber and the rodless cavity of principal arm oil cylinder (8) respectively; Be provided with first balance cock (6a) between the rodless cavity of said first change-over valve (4a) and principal arm oil cylinder (8); Be provided with first governor valve (5a) between the rodless cavity of said first change-over valve (4a) and principal arm oil cylinder (8), be provided with second governor valve (5b) between the rod chamber of said first change-over valve (4a) and principal arm oil cylinder (8);
Two switching-over mouths of said second change-over valve (4b) are communicated with the rod chamber and the rodless cavity of auxiliary oil cylinder (9) respectively; Be provided with second balance cock (6b) between the rodless cavity of said second change-over valve (4b) and auxiliary oil cylinder (9); Be provided with the 3rd governor valve (5c) between the rodless cavity of said second change-over valve (4b) and auxiliary oil cylinder (9), be provided with the 4th governor valve (5d) between the rod chamber of said second change-over valve (4b) and auxiliary oil cylinder (9).
4. the luffing hydraulic control system is hung in joint according to claim 3; It is characterized in that: said oil pump is load sensitive pump (1); Said multiway valve is load-sensitive multiple directional control valve (4); Said load sensitive pump (1) comprises pressure hydraulic fluid port and control port; The pressure hydraulic fluid port of said load sensitive pump (1) is communicated with the main oil inlet of load-sensitive multiple directional control valve (4), and the control port of said load sensitive pump (1) is communicated with the load-sensing oil circuit of load-sensitive multiple directional control valve (4).
5. the luffing hydraulic control system is hung in joint according to claim 4; It is characterized in that: also be provided with the 3rd balance cock (6c) between the rod chamber of said second change-over valve (4b) and auxiliary oil cylinder (9), the controlled end of said the 3rd balance cock (6c) is communicated to the oil circuit between second change-over valve (4b) and second balance cock (6b).
6. the luffing hydraulic control system is hung in joint according to claim 2; It is characterized in that: be provided with first shuttle valve (7a) between the rod chamber of said manual pump (2) and principal arm oil cylinder (8), be provided with second shuttle valve (7b) between the rod chamber of said manual pump (2) and auxiliary oil cylinder (9).
7. the luffing hydraulic control system is hung in joint according to claim 6; It is characterized in that: be provided with first safety valve (3a) between the mouth of said manual pump (2) and first shuttle valve (7a); Be provided with second safety valve (3b) between the rod chamber of said auxiliary oil cylinder (9) and the 3rd balance cock (6c), the mouth of said first safety valve (3a) and second safety valve (3b) all is communicated with fuel tank (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204042698U CN202322125U (en) | 2011-10-21 | 2011-10-21 | Hydraulic control system with adjustable amplitude for articulated lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204042698U CN202322125U (en) | 2011-10-21 | 2011-10-21 | Hydraulic control system with adjustable amplitude for articulated lifting device |
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| Publication Number | Publication Date |
|---|---|
| CN202322125U true CN202322125U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204042698U Expired - Fee Related CN202322125U (en) | 2011-10-21 | 2011-10-21 | Hydraulic control system with adjustable amplitude for articulated lifting device |
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| CN (1) | CN202322125U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502434A (en) * | 2011-10-21 | 2012-06-20 | 四川宏华石油设备有限公司 | Luffing hydraulic controlling system of joint lift |
| CN102874699A (en) * | 2012-08-29 | 2013-01-16 | 徐州市工大三森科技有限公司 | Constant-power automatic speed regulation self-rendering winch |
| CN102887435A (en) * | 2012-10-19 | 2013-01-23 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of crane boom, control method and crane |
| CN103395692A (en) * | 2013-08-12 | 2013-11-20 | 四川宏华石油设备有限公司 | Anti-swing device of clamping module |
| CN104016254A (en) * | 2014-06-23 | 2014-09-03 | 镇江杭川机械制造有限公司 | Emergent descending system of jib |
| CN104481954A (en) * | 2014-12-17 | 2015-04-01 | 湖南星邦重工有限公司 | Mechanical cantilever crane and balance valve group thereof |
| CN104477798A (en) * | 2014-12-10 | 2015-04-01 | 中联重科股份有限公司 | Amplitude-variable control system of main arm of crane and crane |
| CN104555766A (en) * | 2015-01-12 | 2015-04-29 | 徐州徐工随车起重机有限公司 | Hydraulic control moment restriction system of folding arm lorry-mounted crane |
| CN105822615A (en) * | 2016-04-29 | 2016-08-03 | 泰富重工制造有限公司 | Hydraulic control system of engineering machinery amplitude change mechanism |
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2011
- 2011-10-21 CN CN2011204042698U patent/CN202322125U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502434A (en) * | 2011-10-21 | 2012-06-20 | 四川宏华石油设备有限公司 | Luffing hydraulic controlling system of joint lift |
| CN102502434B (en) * | 2011-10-21 | 2013-12-11 | 四川宏华石油设备有限公司 | Luffing hydraulic controlling system of joint lift |
| CN102874699A (en) * | 2012-08-29 | 2013-01-16 | 徐州市工大三森科技有限公司 | Constant-power automatic speed regulation self-rendering winch |
| CN102887435B (en) * | 2012-10-19 | 2014-11-05 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of crane boom, control method and crane |
| CN102887435A (en) * | 2012-10-19 | 2013-01-23 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of crane boom, control method and crane |
| CN103395692A (en) * | 2013-08-12 | 2013-11-20 | 四川宏华石油设备有限公司 | Anti-swing device of clamping module |
| CN103395692B (en) * | 2013-08-12 | 2015-06-10 | 四川宏华石油设备有限公司 | Anti-swing device of clamping module |
| CN104016254A (en) * | 2014-06-23 | 2014-09-03 | 镇江杭川机械制造有限公司 | Emergent descending system of jib |
| CN104477798A (en) * | 2014-12-10 | 2015-04-01 | 中联重科股份有限公司 | Amplitude-variable control system of main arm of crane and crane |
| CN104477798B (en) * | 2014-12-10 | 2016-08-17 | 中联重科股份有限公司 | The principal arm luffing control system of crane and crane |
| CN104481954A (en) * | 2014-12-17 | 2015-04-01 | 湖南星邦重工有限公司 | Mechanical cantilever crane and balance valve group thereof |
| CN104555766A (en) * | 2015-01-12 | 2015-04-29 | 徐州徐工随车起重机有限公司 | Hydraulic control moment restriction system of folding arm lorry-mounted crane |
| CN104555766B (en) * | 2015-01-12 | 2016-08-24 | 徐州徐工随车起重机有限公司 | A kind of folding arm lorry-mounted crane hydraulic control moment limiting system |
| CN105822615A (en) * | 2016-04-29 | 2016-08-03 | 泰富重工制造有限公司 | Hydraulic control system of engineering machinery amplitude change mechanism |
| CN105822615B (en) * | 2016-04-29 | 2017-10-03 | 泰富重工制造有限公司 | The hydraulic control system of engineering machinery jib lubbing mechanism |
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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 |
Granted publication date: 20120711 Termination date: 20171021 |
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| CF01 | Termination of patent right due to non-payment of annual fee |