CN203428881U - Hydraulic control system of cantilever crane or ladder frame - Google Patents
Hydraulic control system of cantilever crane or ladder frame Download PDFInfo
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- CN203428881U CN203428881U CN201320512648.8U CN201320512648U CN203428881U CN 203428881 U CN203428881 U CN 203428881U CN 201320512648 U CN201320512648 U CN 201320512648U CN 203428881 U CN203428881 U CN 203428881U
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- 239000003921 oil Substances 0.000 claims abstract description 129
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 24
- 239000002828 fuel tank Substances 0.000 claims description 20
- 230000004044 response Effects 0.000 claims description 12
- 238000013016 damping Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a hydraulic control system of a cantilever crane or a ladder frame. The hydraulic control system comprises a main oil pump which can pump hydraulic oil in an oil tank to an oil cylinder. An oil supply oil way connected with an oil outlet of the main oil pump and an oil return way connected with the oil tank are connected to an oil inlet and an oil return opening of a getting-on operation valve respectively in a hydraulic mode, and a first work oil opening and a second work oil opening of the getting-on operation valve are connected to a rodless cavity and a rod cavity of the oil cylinder respectively in a hydraulic mode. The rodless cavity and the rod cavity of the oil cylinder are connected through an emergency oil way in a hydraulic mode, a switch component is arranged on the emergency oil way, so that when the getting-on operation valve is switched to enable the first work oil opening and the second work oil opening to be both communicated with the oil tank and the switch component is controlled to be turned on, hydraulic oil in the rodless cavity of the oil cylinder can flow into the rod cavity through the switch component. The hydraulic control system can retract the cantilever crane or the ladder frame through the gravity of the cantilever crane on the ladder frame, saves energy, and is high in reliability and work efficiency.
Description
Technical field
The utility model relates to Hydraulic Field, particularly, relates to the hydraulic control system of a kind of jib or ladder.
Background technology
The aerial platform with jib or ladder is conventionally driven and is controlled flexible, the luffing of jib or ladder or rotation etc. by hydraulic control system, but when the et out of orders such as driving engine, main oil pump cause hydraulic efficiency pressure system cisco unity malfunction, and then cause that the jib of stretching, extension or ladder can not shrink, to aerial platform, bring potential safety hazard, and be also not easy to maintenance.Therefore, general hydraulic control system is provided with emergent oil pump, passes through emergent oil pump to system fuel feeding when above-mentioned situation occurs.
Be illustrated in figure 1 a kind of jib of embodiment or the hydraulic control system of ladder of prior art, this hydraulic control system comprises main oil pump 3 and the emergent oil pump 13 being arranged in parallel, both are connected to oil cylinder 2 by the operating valve 4 of getting on the bus, in the out-of-action situation of main oil pump 3, by vehicular power-bottle, drive emergent oil pump 13 fuel feeding to oil cylinder 2, and control the operating valve 4 of getting on the bus, so that jib or ladder are shunk.
Be illustrated in figure 2 the jib of another kind of embodiment or the hydraulic control system of ladder of prior art, this hydraulic control system comprises main oil pump 3 and the emergent oil pump 13 being arranged in parallel, both are connected to oil cylinder 2 by the operating valve 4 of getting on the bus, and rod chamber and the rodless cavity of oil cylinder 2 are communicated with by oil circuit, on this oil circuit, be provided with solenoid directional control valve and check valve (unmarked).In the out-of-action situation of main oil pump 3, by vehicular power-bottle, drive emergent oil pump 13 fuel feeding to oil cylinder 2, control the operating valve 4 of getting on the bus, jib or ladder are shunk; Or solenoid directional control valve is opened, under the effect of the self gravitation of jib or ladder, the hydraulic oil of rod chamber is flowed in rodless cavity, the piston rod of oil cylinder is retracted, so that jib or ladder are shunk.
But, because needs vehicular power-bottle powers to drive emergent oil pump 13 pumps hydraulic oil, cause the waste of energy; Because the electric weight of vehicular power-bottle is limited, cannot support to regain compared with the jib of the relatively large aerial platform of high-amperage or ladder, safety and reliability is poor, and the power of emergent oil pump 13 itself is low, discharge capacity is little, cause the time that the whole withdrawal of jib or ladder need to be longer, operating efficiency is lower.
In addition, in hydraulic control system as shown in Figure 2, hydraulic oil flows to rodless cavity from rod chamber, because the volume of rod chamber is less than the volume of rodless cavity, also need simultaneously back pressure valve by being communicated with fuel tank from fuel tank oil suction to rodless cavity, easily like this cause rodless cavity repairing not enough and form certain vacuum, cause system to have potential safety hazard.
Utility model content
The purpose of this utility model is to provide the hydraulic control system of a kind of jib or ladder, this hydraulic control system does not need vehicular power-bottle power supply and emergency oil oil pump feed and gravity by jib or ladder self reclaims jib or ladder, saved the energy, and reliability and operating efficiency higher.
To achieve these goals, the utility model provides the hydraulic control system of a kind of jib or ladder, this hydraulic control system comprises can give the hydraulic oil pump in fuel tank the main oil pump of oil cylinder, the oil return circuit that the oil feeding line that the oil outlet of this main oil pump connects is connected with described fuel tank respectively hydraulic connecting to oil inlet and the return opening of the operating valve of getting on the bus, and the first actuator port of this operating valve of getting on the bus and the second actuator port difference hydraulic connecting are to rodless cavity and the rod chamber of described oil cylinder, thereby form the hydraulically extensible control loop of described oil cylinder, wherein, between the rodless cavity of described oil cylinder and rod chamber by being provided with control group on emergent oil circuit hydraulic connecting and this emergent oil circuit, to switch at the described operating valve of getting on the bus, described the first actuator port and the second actuator port are all communicated with and described control group is controlled when opening with described fuel tank, hydraulic oil in the rodless cavity of described oil cylinder can flow in described rod chamber by described control group.
Preferably, described control group comprises switch valve, and this switch valve hydraulic connecting is between described rodless cavity and described rod chamber.
Preferably, described switch valve is solenoid directional control valve.
Preferably, on the through-flow runner under the through-flow state of described solenoid directional control valve, there is damping hole.
Preferably, described switch valve is pilot operated directional control valve.
Preferably, the control port of described pilot operated directional control valve is via emergent control cock hydraulic connecting in described rodless cavity, and the control port that this emergent control cock can be controlled described pilot operated directional control valve is communicated with or ends with described rodless cavity.
Preferably, described emergent control cock is manual control formula change-over valve.
Preferably, between described switch valve and described rod chamber, be provided with check valve.
Preferably, pipeline between described check valve and described rod chamber by the first balance cock or one-way back pressure valve with described in get on the bus the second actuator port of operating valve be communicated with, and the response pressure of described the first balance cock or described one-way back pressure valve is greater than the response pressure of described check valve.
Preferably, the pipeline between described check valve and described switch valve is communicated with described fuel tank by back pressure valve, and the response pressure of described back pressure valve is greater than the response pressure of described check valve.
Pass through technique scheme, the in the situation that of hydraulic control system et out of order cisco unity malfunction, get on the bus operating valve in meta, the first actuator port and second actuator port of operating valve of getting on the bus is all communicated with fuel tank, and control group is in open mode, and rodless cavity and rod chamber are communicated with by the emergent oil circuit of conducting.Be subject to the Action of Gravity Field of jib or ladder, the piston rod of oil cylinder is retracted, and the hydraulic oil in rodless cavity is discharged and flowed in rod chamber by emergent oil circuit, and piston rod can be moved towards rodless cavity, so that jib or ladder are regained, guarantees the safety of equipment.
Wherein, this hydraulic control system does not need vehicular power-bottle to power to drive emergency oil oil pump feed to reclaim jib or ladder, but the gravity that utilizes jib or ladder self is realized the recovery of jib or ladder, saved the energy, under any circumstance jib or ladder can be regained, reliability is higher, and operating efficiency is higher.
Moreover, because the volume of rodless cavity is greater than the volume of rod chamber, in the process that jib or ladder are regained the hydraulic oil of rod chamber supply with sufficient, thereby can not form vacuum, safety is higher.
Other feature and advantage of the present utility model partly in detail are described the specific embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification sheets, is used from explanation the utility model, but does not form restriction of the present utility model with the specific embodiment one below.In the accompanying drawings:
Fig. 1 is a kind of jib of embodiment of prior art or the schematic diagram of the hydraulic control system of ladder;
Fig. 2 is the jib of another kind of embodiment of prior art or the schematic diagram of the hydraulic control system of ladder;
Fig. 3 is the schematic diagram of the jib of a kind of embodiment of the present utility model or the hydraulic control system of ladder;
Fig. 4 is the schematic diagram of the jib of another kind of embodiment of the present utility model or the hydraulic control system of ladder.
Description of reference numerals
1 fuel tank 2 oil cylinders
3 main oil pumps 4 operating valve of getting on the bus
5 control group 6 switch valves
The emergent control cock of 7 damping hole 8
9 check valve 10 first balance cocks or one-way back pressure valves
11 back pressure valve 12 second balance cocks
13 emergent oil pump P oil inlets
T return opening A the first actuator port
B the second actuator port
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is elaborated.Should be understood that, the specific embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
As shown in Figure 3 and Figure 4, the specific embodiment of the present utility model provides the hydraulic control system of a kind of jib or ladder, this hydraulic control system comprises can give the hydraulic oil pump in fuel tank 1 main oil pump 3 of oil cylinder 2, the oil return circuit that the oil feeding line that the oil outlet of this main oil pump 3 connects is connected with described fuel tank respectively hydraulic connecting to oil inlet P and the oil return inlet T of the operating valve 4 of getting on the bus, and the first actuator port A of this operating valve 4 of getting on the bus and the second actuator port B difference hydraulic connecting are to rodless cavity and the rod chamber of described oil cylinder 2, thereby form the hydraulically extensible control loop of described oil cylinder 2, wherein, between the rodless cavity of described oil cylinder 2 and rod chamber by being provided with control group 5 on emergent oil circuit hydraulic connecting and this emergent oil circuit, to switch at the described operating valve 4 of getting on the bus, described the first actuator port A and the second actuator port B are all communicated with and described control group 5 is controlled when opening with described fuel tank 1, hydraulic oil in the rodless cavity of described oil cylinder 2 can flow in described rod chamber by described control group 5.
The in the situation that of hydraulic control system et out of order cisco unity malfunction, get on the bus operating valve 4 in meta, the first actuator port A and the second actuator port B of operating valve 4 of getting on the bus is all communicated with fuel tank 1, and control group 5 is in open mode, and rodless cavity and rod chamber are communicated with by the emergent oil circuit of conducting.Be subject to the Action of Gravity Field of jib or ladder, the piston rod of oil cylinder 2 is retracted, and the hydraulic oil in rodless cavity is discharged and flowed in rod chamber by emergent oil circuit, and piston rod can be moved towards rodless cavity, so that jib or ladder are regained, guarantees the safety of equipment.
Wherein, this hydraulic control system does not need vehicular power-bottle to power to drive emergency oil oil pump feed to reclaim jib or ladder, but the gravity that utilizes jib or ladder self is realized the recovery of jib or ladder, saved the energy, under any circumstance jib or ladder can be regained, reliability is higher, and operating efficiency is higher.
Moreover, because the volume of rodless cavity is greater than the volume of rod chamber, in the process that jib or ladder are regained the hydraulic oil of rod chamber supply with sufficient, thereby can not form vacuum, safety is higher.
As shown in Figure 3, as a kind of embodiment of switch valve 6, described switch valve 6 is solenoid directional control valve, particularly, switch valve 6 can be bi-bit bi-pass solenoid directional control valve, realizes switch control by automatically controlled mode, simple in structure, it is convenient to control, and is convenient to realize automation and controls.During solenoid directional control valve dead electricity, be positioned at right position, solenoid directional control valve cut-off, emergent oil circuit cut-off; Solenoid directional control valve obtains when electric and is positioned at left position, solenoid directional control valve conducting, emergent oil circuit conducting.
As shown in Figure 3, preferably, on the through-flow runner under the through-flow state of described solenoid directional control valve, there is damping hole 7, by the size in damping adjusting hole 7, can control through-flow flow, thereby control the kinematic velocity of the piston rod of oil cylinder, and then control the recovery speed of ladder or jib.
As shown in Figure 4, another kind of embodiment as switch valve 6, described switch valve 6 is pilot operated directional control valve, particularly, switch valve 6 can be two-position two-way hydraulic control change-over valve, and the mode by hydraulic control realizes switch and controls, simple in structure, it is convenient to control, and does not need to configure corresponding automatically controlled program and structure.When pilot operated directional control valve is positioned at left position, pilot operated directional control valve cut-off, emergent oil circuit cut-off; Pilot operated directional control valve is positioned at right position, pilot operated directional control valve conducting, emergent oil circuit conducting.
The commutation of pilot operated directional control valve is controlled and can be realized by various oil circuits, for example, independent outer oil circuit can be set and independently control.As shown in Figure 4, preferably, the control port of described pilot operated directional control valve is via emergent control cock 8 hydraulic connectings in described rodless cavity, and the control port that this emergent control cock 8 can be controlled described pilot operated directional control valve is communicated with or ends with described rodless cavity.When emergent control cock 8 is opened, the control port of pilot operated directional control valve is communicated with rodless cavity, and the pressure control that pilot operated directional control valve is subject to rodless cavity is switched to conducting state, makes the hydraulic oil of rodless cavity can flow in rod chamber; When emergent control cock 8 is closed, the control port of pilot operated directional control valve and rodless cavity cut-off, pilot operated directional control valve remain off state, is not communicated with rodless cavity and rod chamber.
As shown in Figure 3 and Figure 4, in order to prevent that the hydraulic oil in rod chamber is back in rodless cavity, preferably, between described switch valve 6 and described rod chamber, be provided with check valve 9,9 of check valves allow hydraulic oil to flow to rod chamber from rodless cavity, the piston rod of oil cylinder can only be retracted so that jib or ladder are regained, guarantee the safety and reliability of operation.
As shown in Figure 3, preferably, pipeline between described check valve 9 and described rod chamber by the first balance cock or one-way back pressure valve 10 with described in get on the bus the second actuator port B of operating valve 4 be communicated with, and the response pressure of described the first balance cock or described one-way back pressure valve 10 is greater than the response pressure of described check valve 9, thereby the hydraulic oil of rodless cavity preferentially enters in rod chamber, prevent that rod chamber suction is empty, make the piston rod of oil cylinder retract that jib or ladder are regained.In addition, unnecessary hydraulic oil can flow back to fuel tank 1 by the first balance cock or one-way back pressure valve 10, avoids system pressure too high.
As shown in Figure 4, for the ease of hydraulic oil backflow meeting fuel tank 1, preferably, the pipeline between described check valve 9 and described switch valve 6 is communicated with described fuel tank 1 by back pressure valve 11, and the response pressure of described back pressure valve 11 is greater than the response pressure of described check valve 9.Because the volume of rodless cavity is greater than the volume of rod chamber, in the process that reclaims jib or ladder, can produce unnecessary hydraulic oil, these hydraulic oil can be back to fuel tank 1 by back pressure valve 11, avoid system pressure too high.
As shown in Figure 3 and Figure 4, preferably, in the first actuator port A of the described operating valve 4 of getting on the bus and the working oil path between described rodless cavity, be provided with the second balance cock 12, make oil cylinder 2 can hover over for a long time a certain position, thereby jib or ladder can remain on a certain position or attitude operation.
As shown in Figure 3 and Figure 4, preferably, described in get on the bus operating valve 4 for multiple directional control valve, the hydraulically extensible control loop of described oil cylinder 2 is realized commutation by a slice change-over valve in this multiple directional control valve and is controlled.When system works, when the oil inlet P of multiple directional control valve is communicated with the first actuator port A and the second actuator port B is communicated with oil return inlet T, the rodless cavity oil-feed of oil cylinder 2, rod chamber is fuel-displaced, and piston rod stretches out, and jib or ladder launch; After a slice change-over valve commutation in multiple directional control valve, when the oil inlet P of multiple directional control valve is communicated with the second actuator port B and the first actuator port A is communicated with oil return inlet T, the rod chamber oil-feed of oil cylinder 2, rodless cavity is fuel-displaced, and piston rod is retracted, and jib or ladder are regained.
As shown in Figure 3 and Figure 4, preferably, oil inlet P and the oil return inlet T of the operating valve 4 of getting on the bus described in described oil feeding line and described oil return circuit are connected in via the change-over valve of getting on or off the bus, the wherein said change-over valve of getting on or off the bus is change-over valve.The change-over valve of getting on or off the bus is realized 3 pairs of device of boarding of main oil pump (such as the operating valve 4 of getting on the bus, oil cylinder 2 etc.) fuel feeding or to the switching between the device of getting off (such as traveling gear etc.) fuel feeding, to realize fuel feeding and the driving of 3 pairs of different actuating units of main oil pump, to make full use of the power of main oil pump 3, simplify the element of hydraulic control system.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each concrete technical characterictic described in the above-mentioned specific embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present utility model, also can carry out combination in any, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (10)
1. the hydraulic control system of a jib or ladder, this hydraulic control system comprises and can give the main oil pump (3) of oil cylinder (2) by the hydraulic oil pump in fuel tank (1), the oil return circuit that the oil feeding line that the oil outlet of this main oil pump (3) connects is connected with described fuel tank respectively hydraulic connecting to oil inlet (P) and the return opening (T) of the operating valve of getting on the bus (4), and first actuator port (A) of this operating valve of getting on the bus (4) and the second actuator port (B) difference hydraulic connecting are to rodless cavity and the rod chamber of described oil cylinder (2), thereby form the hydraulically extensible control loop of described oil cylinder (2), it is characterized in that, between the rodless cavity of described oil cylinder (2) and rod chamber by being provided with control group (5) on emergent oil circuit hydraulic connecting and this emergent oil circuit, to switch at the described operating valve of getting on the bus (4), described the first actuator port (A) and the second actuator port (B) are all communicated with and described control group (5) is controlled when opening with described fuel tank (1), hydraulic oil in the rodless cavity of described oil cylinder (2) can flow in described rod chamber by described control group (5).
2. the hydraulic control system of jib according to claim 1 or ladder, is characterized in that, described control group (5) comprises switch valve (6), and this switch valve (6) hydraulic connecting is between described rodless cavity and described rod chamber.
3. the hydraulic control system of jib according to claim 2 or ladder, is characterized in that, described switch valve (6) is solenoid directional control valve.
4. the hydraulic control system of jib according to claim 3 or ladder, is characterized in that, has damping hole (7) on the through-flow runner under the through-flow state of described solenoid directional control valve.
5. the hydraulic control system of jib according to claim 2 or ladder, is characterized in that, described switch valve (6) is pilot operated directional control valve.
6. the hydraulic control system of jib according to claim 5 or ladder, it is characterized in that, the control port of described pilot operated directional control valve is via emergent control cock (8) hydraulic connecting in described rodless cavity, and the control port that this emergent control cock (8) can be controlled described pilot operated directional control valve is communicated with or ends with described rodless cavity.
7. the hydraulic control system of jib according to claim 6 or ladder, is characterized in that, described emergent control cock (8) is manual control formula change-over valve.
8. the hydraulic control system of jib according to claim 2 or ladder, is characterized in that, is provided with check valve (9) between described switch valve (6) and described rod chamber.
9. the hydraulic control system of jib according to claim 8 or ladder, it is characterized in that, pipeline between described check valve (9) and described rod chamber by the first balance cock or one-way back pressure valve (10) with described in get on the bus second actuator port (B) of operating valve (4) be communicated with, and the response pressure of described the first balance cock or described one-way back pressure valve (10) is greater than the response pressure of described check valve (9).
10. the hydraulic control system of jib according to claim 8 or ladder, it is characterized in that, pipeline between described check valve (9) and described switch valve (6) is communicated with described fuel tank (1) by back pressure valve (11), and the response pressure of described back pressure valve (11) is greater than the response pressure of described check valve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320512648.8U CN203428881U (en) | 2013-08-21 | 2013-08-21 | Hydraulic control system of cantilever crane or ladder frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320512648.8U CN203428881U (en) | 2013-08-21 | 2013-08-21 | Hydraulic control system of cantilever crane or ladder frame |
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| Publication Number | Publication Date |
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| CN203428881U true CN203428881U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320512648.8U Expired - Lifetime CN203428881U (en) | 2013-08-21 | 2013-08-21 | Hydraulic control system of cantilever crane or ladder frame |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154059A (en) * | 2014-06-19 | 2014-11-19 | 长沙中联消防机械有限公司 | Hydraulic system of telescopic device and telescopic device |
| CN106829815A (en) * | 2017-03-27 | 2017-06-13 | 徐工消防安全装备有限公司 | The arm support control system and aerial work platform of aerial work platform |
| CN108412827A (en) * | 2018-05-16 | 2018-08-17 | 湖南星邦重工有限公司 | A kind of hydraulic moving control system |
| CN109989955A (en) * | 2019-04-30 | 2019-07-09 | 广东联城住工装备信息科技有限公司 | The hydraulic system of edge-on machine, edge-on machine and its control method |
| CN113790182A (en) * | 2021-09-22 | 2021-12-14 | 湖南星邦智能装备股份有限公司 | Cantilever crane self-weight retraction control system and control method |
| CN114738340A (en) * | 2022-05-16 | 2022-07-12 | 江苏谷登桩工科技有限公司 | Rapid pile lifting potential energy regeneration system of static pile press and control method thereof |
-
2013
- 2013-08-21 CN CN201320512648.8U patent/CN203428881U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154059A (en) * | 2014-06-19 | 2014-11-19 | 长沙中联消防机械有限公司 | Hydraulic system of telescopic device and telescopic device |
| CN106829815A (en) * | 2017-03-27 | 2017-06-13 | 徐工消防安全装备有限公司 | The arm support control system and aerial work platform of aerial work platform |
| CN108412827A (en) * | 2018-05-16 | 2018-08-17 | 湖南星邦重工有限公司 | A kind of hydraulic moving control system |
| CN108412827B (en) * | 2018-05-16 | 2024-03-08 | 湖南星邦智能装备股份有限公司 | Hydraulic walking control system |
| CN109989955A (en) * | 2019-04-30 | 2019-07-09 | 广东联城住工装备信息科技有限公司 | The hydraulic system of edge-on machine, edge-on machine and its control method |
| CN113790182A (en) * | 2021-09-22 | 2021-12-14 | 湖南星邦智能装备股份有限公司 | Cantilever crane self-weight retraction control system and control method |
| CN113790182B (en) * | 2021-09-22 | 2024-04-19 | 湖南星邦智能装备股份有限公司 | Arm support dead weight retraction control system and control method |
| CN114738340A (en) * | 2022-05-16 | 2022-07-12 | 江苏谷登桩工科技有限公司 | Rapid pile lifting potential energy regeneration system of static pile press and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co.,Ltd. Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Address before: No.997 Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian Fire-Fighting Machinery Co.,Ltd. Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140212 |