CN108799219B - Crane and single-cylinder bolt type telescopic mechanism hydraulic control system thereof - Google Patents
Crane and single-cylinder bolt type telescopic mechanism hydraulic control system thereof Download PDFInfo
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- CN108799219B CN108799219B CN201810748378.8A CN201810748378A CN108799219B CN 108799219 B CN108799219 B CN 108799219B CN 201810748378 A CN201810748378 A CN 201810748378A CN 108799219 B CN108799219 B CN 108799219B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 51
- 230000009471 action Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 151
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
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- Jib Cranes (AREA)
Abstract
The invention provides a crane and a single-cylinder bolt type telescopic mechanism hydraulic control system thereof, wherein the single-cylinder bolt type telescopic mechanism hydraulic control system comprises a master control valve, a cylinder arm pin control system and a cylinder arm pin oil way; the master control valve is provided with an oil inlet, a first oil outlet, a second oil outlet and a control port; the cylinder arm pin control system comprises a first reversing valve and a cylinder arm pin control subsystem; the first reversing valve is connected between the first oil outlet and the control port; the cylinder arm pin control subsystem is connected between the first oil outlet and the cylinder arm pin oil way; the oil inlet is used for being connected with an oil pump of a crane rotation system; the second oil outlet is used for being connected with a rotary system of the crane; when the first reversing valve is electrified, the oil inlet is communicated with the first oil outlet and the second oil outlet; when the first reversing valve is powered off, the oil pressure between the oil inlet and the first oil outlet is unloaded, and the oil inlet is communicated with the second oil outlet.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a crane and a hydraulic control system of a single-cylinder bolt type telescopic mechanism of the crane.
Background
In the prior art, for a large-tonnage truck crane, a single-cylinder bolt type telescopic arm mechanism is mainly adopted, the large-tonnage truck crane adopts a plurality of power take-off ports, and a control oil path of a cylinder arm cylinder/an arm pin cylinder is supplied with oil by adopting an independent gear pump.
Fig. 1 is a schematic diagram of a hydraulic control system of a bolt type telescopic mechanism of a truck crane in the prior art. As shown in fig. 1, when the electromagnetic directional valve 1 is electrified, the gear pump 3 starts to work, pressure oil enters the cylinder arm cylinder/arm pin cylinder, and the cylinder pin/arm pin is pulled out; when the electromagnetic directional valve 1 loses power, the gear pump 3 starts unloading, the cylinder pin/arm pin is inserted at the moment, and the system pressure is set by the overflow valve 2.
With the application of the single-cylinder bolt system becoming more and more extensive, the length of the cargo boom of the medium-and small-tonnage truck crane is gradually lengthened, the medium-tonnage truck crane gradually adopts a single-cylinder bolt six-section boom structure, but the lower chassis of the crane of the tonnage level has a compact structure and mostly adopts a single power takeoff, on the basis, the arrangement mode of the series oil pump is difficult, and the load of the transmission shaft can be greatly increased.
Disclosure of Invention
The invention provides a hydraulic control system for a single-cylinder bolt type telescopic mechanism of a crane, and aims to solve the technical problems in the prior art.
The invention provides a hydraulic control system of a single-cylinder bolt type telescopic mechanism of a crane, which comprises a master control valve, a cylinder arm pin control system and a cylinder arm pin oil way, wherein the master control valve is connected with the cylinder arm pin control system through a hydraulic oil pipe; wherein,
the master control valve is provided with an oil inlet, a first oil outlet, a second oil outlet and a control port; the cylinder arm pin control system comprises a first reversing valve and a cylinder arm pin control subsystem;
the first reversing valve is connected between the first oil outlet and the control port; the cylinder arm pin control subsystem is connected between the first oil outlet and the cylinder arm pin oil way; the oil inlet is used for being connected with an oil pump of a crane rotation system; the second oil outlet is used for being connected with a rotary system of the crane;
when the first reversing valve is electrified, the oil inlet is communicated with the first oil outlet and the oil inlet is communicated with the second oil outlet;
when the first reversing valve is powered off, the oil pressure between the oil inlet and the first oil outlet is unloaded, and the oil inlet is communicated with the second oil outlet.
Further, the general control valve is a priority valve.
Further, the cylinder arm pin control subsystem includes a second directional valve;
when the first reversing valve and the second reversing valve are powered on, the oil inlet is communicated with the cylinder arm pin oil way;
when the first reversing valve and the second reversing valve are both de-energized, the oil path between the oil inlet and the cylinder arm pin oil path is unloaded.
Further, the cylinder arm pin control subsystem further comprises an accumulator and a first one-way valve;
the first one-way valve and the energy accumulator are sequentially arranged on an oil path from the first oil outlet to the second reversing valve;
when the first reversing valve is de-energized and the second reversing valve is energized, the cylinder arm pin controls the subsystem to maintain pressure under the action of the energy accumulator and the first one-way valve.
Further, the oil tank and the second one-way valve are further included;
the second one-way valve is connected between the second reversing valve and the oil tank and used for unloading the cylinder arm pin control subsystem and the cylinder arm pin oil path.
Further, the device also comprises an oil tank and a first overflow valve;
the first overflow valve is connected between the oil tank and the cylinder arm pin oil path.
Further, the first reversing valve and the second reversing valve are both electromagnetic reversing valves.
Further, the device also comprises an oil tank and a second overflow valve;
the second overflow valve is connected between the oil tank and the first reversing valve.
The hydraulic control system of the single-cylinder bolt type telescopic mechanism of the crane comprises a master control valve, a cylinder arm pin control system and a cylinder arm pin oil way; the master control valve is provided with an oil inlet, a first oil outlet, a second oil outlet and a control port; the cylinder arm pin control system comprises a first reversing valve and a cylinder arm pin control subsystem, the first reversing valve is connected between a first oil outlet and a control port, the cylinder arm pin control subsystem is connected between the first oil outlet and a cylinder arm pin oil way, an oil inlet is used for being connected with an oil pump of a crane rotation system, and a second oil outlet is used for being connected with the crane rotation system; when the first reversing valve is electrified, the oil inlet is communicated with the first oil outlet and the second oil outlet; when the first reversing valve is powered off, the oil pressure between the oil inlet and the first oil outlet is unloaded, and the oil inlet is communicated with the second oil outlet.
The single-cylinder bolt type telescopic mechanism hydraulic control system provided by the invention is particularly applied to a medium-and-small-tonnage crane with a single power takeoff. When the hydraulic control system is applied specifically, an oil pump of a crane rotary system is connected with an oil inlet of a master control valve of a hydraulic control system of the single-cylinder bolt type telescopic mechanism, an oil inlet of the rotary system is connected with a second oil outlet of the hydraulic control system of the single-cylinder bolt type telescopic mechanism, and on the basis, the power-on and power-off of a first reversing valve are controlled through a manual button; when the first reversing valve is powered on, the oil inlet is communicated with the first oil outlet and the oil inlet is communicated with the second oil outlet, at the moment, pressure oil enters the cylinder arm pin control subsystem through the master control valve and then enters the cylinder arm pin oil path, the cylinder arm pin control subsystem controls the operation of the cylinder arm pin telescopic mechanism, and meanwhile, the pressure oil enters the rotary system through the master control valve to ensure that the cylinder pin or the arm pin can simultaneously do rotary motion in the state of pulling the cylinder pin or the arm pin; when the first reversing valve is powered off, the oil pressure between the oil inlet and the first oil outlet is unloaded, the oil inlet is communicated with the second oil outlet, at the moment, the cylinder arm pin control subsystem and the cylinder arm pin oil way are unloaded or pressure-maintaining, and pressure oil enters the rotary system through the master control valve.
Compared with the prior art, the hydraulic control system of the single-cylinder bolt type telescopic mechanism provided by the invention can share a pressure oil pump with a rotary system of a crane, and an additional oil pump is not needed for providing power.
The invention also aims to provide a crane, which comprises a rotary system and the hydraulic control system of the single-cylinder bolt type telescopic mechanism of the crane, wherein the rotary system comprises an oil pump; wherein,
the oil pump is connected with an oil inlet of a master control valve of the single-cylinder bolt type telescopic mechanism hydraulic control system;
and an oil inlet of the rotary system is connected with a second oil outlet of the hydraulic control system of the single-cylinder bolt type telescopic mechanism.
Further, the device also comprises a single-cylinder bolt type telescopic mechanism;
the single-cylinder bolt type telescopic mechanism is connected with a cylinder arm bolt oil way of the single-cylinder bolt type telescopic mechanism hydraulic control system.
Compared with the prior art, the crane provided by the invention has the beneficial effects that the hydraulic control system of the single-cylinder bolt type telescopic mechanism provided by the invention has the beneficial effects that the hydraulic control system is not repeated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a hydraulic control system of a bolt type telescopic mechanism of a truck crane in the prior art.
Fig. 2 is a schematic diagram of a hydraulic control system of a single-cylinder bolt type telescopic mechanism of a crane provided by the embodiment of the invention.
Icon:
01-a master control valve; 02-cylinder arm pin control system;
03-cylinder arm pin oil circuit; 04-a rotary system;
11-an oil inlet; 12-a first oil outlet;
13-a second oil outlet; 14-a control port;
21-a first direction valve; 22-cylinder arm pin control subsystem;
23-a second one-way valve; 24-a first overflow valve;
25-a second overflow valve; 221-a second reversing valve;
222-an accumulator; 223-first one-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Fig. 2 is a schematic diagram of a hydraulic control system of a single-cylinder bolt type telescopic mechanism of a crane provided by the embodiment of the invention.
Referring to fig. 2, the embodiment provides a hydraulic control system for a single-cylinder bolt type telescopic mechanism of a crane, which comprises a master control valve 01, a cylinder arm pin control system 02 and a cylinder arm pin oil path 03; the master control valve 01 is provided with an oil inlet 11, a first oil outlet 12, a second oil outlet 13 and a control port 14; the cylinder arm pin control system 02 comprises a first reversing valve 21 and a cylinder arm pin control subsystem 22; the first reversing valve 21 is connected between the first oil outlet 12 and the control port 14; the cylinder arm pin control subsystem 22 is connected between the first oil outlet 12 and the cylinder arm pin oil path 03; the oil inlet 11 is used for being connected with an oil pump of the crane rotation system 04; the second oil outlet 13 is used for being connected with a rotary system 04 of the crane; when the first reversing valve 21 is powered on, the oil inlet 11 is communicated with the first oil outlet 12, and the oil inlet 11 is communicated with the second oil outlet 13; when the first reversing valve 21 is de-energized, the oil pressure between the oil inlet 11 and the first oil outlet 12 is unloaded and the oil inlet 11 is communicated with the second oil outlet 13.
The single-cylinder bolt type telescopic mechanism hydraulic control system provided by the invention is particularly applied to a medium-and-small-tonnage crane with a single power takeoff. When the hydraulic control system is applied specifically, an oil pump of a crane rotary system is connected with an oil inlet of a master control valve of a hydraulic control system of the single-cylinder bolt type telescopic mechanism, an oil inlet of the rotary system is connected with a second oil outlet of the hydraulic control system of the single-cylinder bolt type telescopic mechanism, and on the basis, the power-on and power-off of a first reversing valve are controlled through a manual button; when the first reversing valve is powered on, the oil inlet is communicated with the first oil outlet and the oil inlet is communicated with the second oil outlet, at the moment, pressure oil enters the cylinder arm pin control subsystem through the master control valve and then enters the cylinder arm pin oil path, the cylinder arm pin control subsystem controls the operation of the cylinder arm pin telescopic mechanism, and meanwhile, the pressure oil enters the rotary system through the master control valve to ensure that the cylinder pin or the arm pin can simultaneously do rotary motion in the state of pulling the cylinder pin or the arm pin; when the first reversing valve is powered off, the oil pressure between the oil inlet and the first oil outlet is unloaded, the oil inlet is communicated with the second oil outlet, at the moment, the cylinder arm pin control subsystem and the cylinder arm pin oil way are unloaded or pressure-maintaining, and pressure oil enters the rotary system through the master control valve.
Compared with the prior art, the hydraulic control system of the single-cylinder bolt type telescopic mechanism provided by the invention can share a pressure oil pump with a rotary system of a crane, and an additional oil pump is not needed for providing power.
Further, in this embodiment, preferably, the general control valve 01 is a priority valve.
Wherein the cylinder arm pin control subsystem 22 includes a second directional valve 221; when the first reversing valve 21 and the second reversing valve 221 are powered on, the oil inlet 11 is communicated with the cylinder arm pin oil path 03; when the first reversing valve 21 and the second reversing valve 221 are both de-energized, the oil path between the oil inlet 11 and the cylinder arm pin oil path 03 is unloaded.
Further, the cylinder arm pin control subsystem 22 also includes an accumulator 222 and a first check valve 223; the first check valve 223 and the accumulator 222 are sequentially arranged on an oil path from the first oil outlet 12 to the second direction changing valve 221; when the first reversing valve 21 is de-energized and the second reversing valve 221 is energized, under the action of the energy accumulator 222 and the first one-way valve 223, the cylinder arm pin control subsystem 22 maintains pressure, the response speed of pulling the cylinder pin or the arm pin can be improved, and the pressure oil path can be discharged under the condition of loss control through the reversing valves in the arm retracting process, so that overpressure of a core pipe is avoided. Wherein, the check valve is a first check valve.
Specifically, under the condition that the first reversing valve and the second reversing valve are not powered, the LS oil path of the priority valve is unloaded, namely the pressure of a control port tends to zero, the oil path of the cylinder arm pin control system is unloaded, the cylinder pin or the arm pin is in a plug pin state, and pressure oil enters the rotary system through the priority valve; under the condition that the first reversing valve and the second reversing valve are electrified, pressure oil enters an oil way of the cylinder arm pin control system through the priority valve, and meanwhile, the pressure oil enters the rotation system through the priority valve, so that the cylinder pin or the arm pin can be ensured to simultaneously perform rotation actions in the state of being pulled out; and under the condition that the first reversing valve is powered off and the second reversing valve is powered on, the energy accumulator maintains pressure for an oil path controlled by the cylinder arm pin control subsystem, so that the cylinder pin or the arm pin is kept in an unlocking state.
In this embodiment, the hydraulic control system further includes an oil tank and a second check valve 23, and the second check valve 23 is connected between the second direction changing valve 221 and the oil tank, and is used for unloading the cylinder arm pin control subsystem 22 and the cylinder arm pin oil path 03.
In this embodiment, the hydraulic control system further includes a first overflow valve 24; the first overflow valve 24 is connected between the oil tank and the cylinder arm pin oil path 03 and mainly plays a role of constant pressure overflow.
In this embodiment, it is preferable that the first direction valve 21 and the second direction valve 221 are both electromagnetic direction valves.
In this embodiment, the hydraulic control system further includes a second overflow valve 25; the second relief valve 25 is connected between the tank and the first directional control valve 21, and mainly functions as a constant pressure relief.
Another object of the embodiment of the present invention is to provide a crane, which includes a revolving system 04 and the above hydraulic control system of single-cylinder latch type telescopic mechanism of the crane, where the revolving system 04 includes an oil pump; the oil pump is connected with an oil inlet 11 of a master control valve 01 of the single-cylinder bolt type telescopic mechanism hydraulic control system; an oil inlet of the rotary system 04 is connected with a second oil outlet 13 of the single-cylinder bolt type telescopic mechanism hydraulic control system.
Furthermore, the crane further comprises a single-cylinder bolt type telescopic mechanism, and the single-cylinder bolt type telescopic mechanism is connected with a cylinder arm bolt oil way of the single-cylinder bolt type telescopic mechanism hydraulic control system.
Compared with the prior art, the crane provided by the embodiment of the invention has the beneficial effects that the hydraulic control system of the single-cylinder bolt type telescopic mechanism provided by the embodiment of the invention has the beneficial effects that the hydraulic control system is not described again.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A hydraulic control system of a single-cylinder bolt type telescopic mechanism of a crane is characterized by comprising a master control valve (01), a cylinder arm pin control system (02) and a cylinder arm pin oil way (03); wherein,
the master control valve (01) is provided with an oil inlet (11), a first oil outlet (12), a second oil outlet (13) and a control port (14); the cylinder arm pin control system (02) comprises a first reversing valve (21) and a cylinder arm pin control subsystem (22);
the first reversing valve (21) is connected between the first oil outlet (12) and the control port (14); the cylinder arm pin control subsystem (22) is connected between the first oil outlet (12) and the cylinder arm pin oil path (03); the oil inlet (11) is used for being connected with an oil pump of a crane rotation system (04); the second oil outlet (13) is used for being connected with a rotary system (04) of the crane;
when the first reversing valve (21) is electrified, the oil inlet (11) is communicated with the first oil outlet (12) and the oil inlet (11) is communicated with the second oil outlet (13);
when the first reversing valve (21) is powered off, the oil pressure between the oil inlet (11) and the first oil outlet (12) is unloaded, and the oil inlet (11) is communicated with the second oil outlet (13);
the cylinder arm pin control subsystem (22) includes a second directional valve (221);
when the first reversing valve (21) and the second reversing valve (221) are both electrified, the oil inlet (11) is communicated with the cylinder arm pin oil path (03);
when the first reversing valve (21) and the second reversing valve (221) are both de-energized, an oil path between the oil inlet (11) and the cylinder arm pin oil path (03) is unloaded.
2. The hydraulic control system of a single-cylinder bolt type telescopic mechanism of a crane, as claimed in claim 1, wherein the master control valve (01) is a priority valve.
3. The crane single cylinder pin extension and retraction mechanism hydraulic control system of claim 1, wherein the cylinder arm pin control subsystem (22) further comprises an accumulator (222) and a first check valve (223);
the first one-way valve (223) and the accumulator (222) are sequentially arranged on an oil path from the first oil outlet (12) to the second reversing valve (221);
when the first reversing valve (21) is de-energized and the second reversing valve (221) is energized, the cylinder arm pin control subsystem (22) maintains pressure under the action of the accumulator (222) and the first check valve (223).
4. The hydraulic control system of the single-cylinder bolt type telescopic mechanism of the crane, as recited in claim 1, further comprising an oil tank and a second check valve (23);
the second one-way valve (23) is connected between the second reversing valve (221) and the oil tank and used for unloading the cylinder arm pin control subsystem (22) and the cylinder arm pin oil path (03).
5. The hydraulic control system of the single-cylinder bolt type telescopic mechanism of the crane, as recited in claim 1, further comprising an oil tank and a first overflow valve (24);
the first overflow valve (24) is connected between the oil tank and the cylinder arm pin oil path (03).
6. The hydraulic control system of the single-cylinder bolt type telescopic mechanism of the crane, as recited in claim 1, wherein the first reversing valve (21) and the second reversing valve (221) are both electromagnetic reversing valves.
7. The hydraulic control system of the single-cylinder bolt type telescopic mechanism of the crane, which is characterized by further comprising an oil tank and a second overflow valve (25);
the second overflow valve (25) is connected between the oil tank and the first direction changing valve (21).
8. A crane, characterized by comprising a slewing system (04) and a crane single cylinder latch mechanism hydraulic control system according to any one of claims 1 to 7, the slewing system (04) comprising an oil pump; wherein,
the oil pump is connected with an oil inlet (11) of a master control valve (01) of the single-cylinder bolt type telescopic mechanism hydraulic control system;
and an oil inlet of the rotary system (04) is connected with a second oil outlet (13) of the hydraulic control system of the single-cylinder bolt type telescopic mechanism.
9. The crane of claim 8, further comprising a single cylinder pin-type telescoping mechanism;
the single-cylinder bolt type telescopic mechanism is connected with a cylinder arm bolt oil way (03) of the single-cylinder bolt type telescopic mechanism hydraulic control system.
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| CN201810748378.8A CN108799219B (en) | 2018-07-09 | 2018-07-09 | Crane and single-cylinder bolt type telescopic mechanism hydraulic control system thereof |
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| CN201810748378.8A CN108799219B (en) | 2018-07-09 | 2018-07-09 | Crane and single-cylinder bolt type telescopic mechanism hydraulic control system thereof |
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| CN108799219B true CN108799219B (en) | 2020-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110526140B (en) * | 2019-09-16 | 2021-01-22 | 江苏建筑职业技术学院 | Tire crane auxiliary system and control method |
| CN112661015B (en) * | 2020-12-09 | 2022-11-08 | 中联重科股份有限公司 | Plug-in type hydraulic valve, single-cylinder plug pin type suspension arm hydraulic control system and crane |
| CN113357210B (en) * | 2021-06-28 | 2023-10-13 | 三一汽车起重机械有限公司 | Cylinder arm pin hydraulic control system with flow compensation function and working machine |
| CN114412853B (en) * | 2021-12-31 | 2024-05-14 | 徐州重型机械有限公司 | Double-cylinder head telescopic system and control method |
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| CN103438034A (en) * | 2013-09-03 | 2013-12-11 | 徐州重型机械有限公司 | Hydraulic system and control method of single-cylinder pin type telescopic arm and crane |
| CN104773653A (en) * | 2015-04-08 | 2015-07-15 | 徐州重型机械有限公司 | Telescopic control method, system and telescopic arm structure of single-cylinder plug pin of crane |
| CN205087007U (en) * | 2015-11-18 | 2016-03-16 | 山东达润专用车有限公司 | Explosion -proof diesel engine trackless rubber -tyred vehicle's hydraulic system |
| CN107472357A (en) * | 2017-07-31 | 2017-12-15 | 中联重科股份有限公司 | Hydraulic steering power-assisted system and engineering machinery |
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