CN104632735B - Telescopic control system and method for support oil cylinders and mechanical equipment - Google Patents
Telescopic control system and method for support oil cylinders and mechanical equipment Download PDFInfo
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- CN104632735B CN104632735B CN201410752205.5A CN201410752205A CN104632735B CN 104632735 B CN104632735 B CN 104632735B CN 201410752205 A CN201410752205 A CN 201410752205A CN 104632735 B CN104632735 B CN 104632735B
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- oil cylinder
- support oil
- vertical support
- oil
- valve
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
Abstract
The invention discloses a telescopic control system and method for support oil cylinders and mechanical equipment. The telescopic control system comprises the multiple vertical support oil cylinders. The vertical support oil cylinders (1a) comprise the first vertical support oil cylinders and the second vertical support oil cylinders with the telescopic action start speed lower than that of the first vertical support oil cylinders. Rod end chambers of the vertical support oil cylinders (1a) are connected with first work oil ways (2) respectively, non-rod chambers of the vertical support oil cylinders (1a) are connected with second work oil ways (3) respectively, and the first work oil ways (2) and the second work oil ways (3) of the vertical support oil cylinders (1a) are connected to a shared hydraulic oil supply element through corresponding reversing control valves. At least the first work oil ways (2) of the first vertical support oil cylinders or the second work oil ways (3) are provided with flow control valves, and the hydraulic oil conveying resistance of the first vertical support oil cylinders is adjusted through flow control over the flow control valves.
Description
Technical field
A kind of the present invention relates to hydraulic control system of plant equipment, in particular it relates to the extension and contraction control system of support oil cylinder
System.On this basis, the invention still further relates to having the plant equipment of the telescopic control system of described support oil cylinder.Additionally, this
Bright further relate to a kind of telescopic control method of the support oil cylinder of engineering machinery.
Background technology
For ensureing some large-tonnage engineering trucks (such as crane, high lifting kind fire fighting truck etc.) and other plant equipment (examples
As concrete ground pump) operation with security and stability, need installation telescopic leg on its chassis auxiliary to carry out to this engineering truck
Help support.
Telescopic leg is generally driven by support oil cylinder.It is illustrated in figure 1 a kind of telescopic control system of support oil cylinder, bag
Include multiple support oil cylinders 1 with vertical support oil cylinder 1a and horizontal support legs oil cylinder 1b, each described support oil cylinder 1 connects respectively
Be connected to the first working oil path 2 and the second working oil path 3, be respectively used to the rod chamber of support oil cylinder 1 and the oil-feed of rodless cavity and
Oil return.
In diagram telescopic control system, Hydraulic power units includes main oil pump 7 and emergency pump 8, and the two all can be from fuel tank
11 oil suctions the oil-in p pumps hydraulic oil to supporting leg valve group 13, and by being connected to first working oil of the first actuator port a
Rod chamber fuel feeding from road 2 to support oil cylinder 1 with drive supporting leg shrink, meanwhile, the hydraulic oil in rodless cavity is returned by oil return opening t
Oil；Or driven to the rodless cavity fuel feeding of support oil cylinder 1 by the second working oil path 3 being connected to the second actuator port b and prop up
Lower limb stretches out, and meanwhile, the hydraulic oil in rod chamber passes through oil return opening t oil return.It is arranged on main oil pump 7 and the oil feeding line of emergency pump 8
On check valve 12 it can be avoided that the two influence each other.
During landing leg stretching, make to act on multiple supporting legs and support oil cylinder 1 due to the factor such as manufacturing, using
Resistance is different, and the action moment of each supporting leg and speed of action can be variant.Particularly when main oil pump 7 breaks down, need
Adopt emergency pump 8 fuel feeding to drive support oil cylinder 1 to stretch.Because the discharge capacity of emergency pump 8 is generally less, the flow of its pumping is difficult to
Meet the needs of all support oil cylinders 1 at short notice, the action of resistance less support oil cylinder elder generation will be made, treat pressure rise
The larger support oil cylinder action of resistance could be driven afterwards.If now plant equipment is on the ground of inclination, the little supporting leg of resistance
After oil cylinder shrinks, plant equipment cannot keep stable, and therefore it may happen that the security incident such as tumble.
In view of this it is necessary to provide a kind of telescopic control system of support oil cylinder, existed with solving above-mentioned prior art
Problem.
Content of the invention
The technical problem to be solved is to provide a kind of telescopic control system of support oil cylinder, this extension and contraction control system
System can effectively shorten the time difference of the action moment with different resistance support oil cylinders, can with reduce that plant equipment tumbles
Can property.
To achieve these goals, the present invention provides a kind of telescopic control system of support oil cylinder, including multiple vertical
Lower limb oil cylinder, the plurality of vertical support oil cylinder includes the first vertical support oil cylinder and expanding-contracting action toggle speed is slower than described first
Vertically the second vertical support oil cylinder of support oil cylinder, the rod chamber of each described vertical support oil cylinder is connected to the first work
Oil circuit, the rodless cavity of each described vertical support oil cylinder is connected to the second working oil path, each described vertical support oil cylinder
Described first working oil path and the second working oil path be connected to shared hydraulic pressure fuel feeding via each self-corresponding reversing control valve
Element, wherein, described first working oil path of at least described first vertical support oil cylinder or described second working oil path is arranged
There is flow control valve, the hydraulic oil adjusting described first vertical support oil cylinder with the flow-control by this flow control valve is defeated
Send resistance.
Preferably, described flow control valve is the flow speed control valve being arranged in described first working oil path, or, described flow
Control valve is the choke valve being arranged in described second working oil path.
Preferably, described second working oil path of each described vertical support oil cylinder is provided with described flow-control
Valve；Or described first working oil path of each described vertical support oil cylinder is provided with described flow control valve.
Preferably, described first working oil path at described flow control valve place or described second working oil path are provided with
Switching valve, can optionally control hydraulic oil by described flow-control valve flow by the switching of this switching valve.
Preferably, described flow control valve is integrated in described switching valve；Or, described switching valve allows hand over as connection
State and blocking state, described flow control valve is in parallel with described switching valve, can be controlled by the switching of described switching valve
Hydraulic oil processed is by described flow control valve or described switching valve flow.
Preferably, described telescopic control system includes main oil pump and emergency pump, in described emergency pump pumps hydraulic oil to drive
In the state of dynamic described vertical support oil cylinder shrinks, described switching valve switches to so that hydraulic oil passes through described flow control valve stream
Dynamic.
Preferably, described switching valve is pilot operated directional control valve, the control mouth of this pilot operated directional control valve pass through hydraulic control oil communication in
The force feed mouth of described emergency pump.
Preferably, described switching valve is electric control reversing valve, and described telescopic control system is included for controlling described emergency pump
The controller of start and stop, after described emergent pump startup, described controller controls described switching valve to switch to so that hydraulic oil passes through
Described flow-control valve flow.
Additionally, the present invention also provides a kind of plant equipment, including the telescopic outrigger being driven by support oil cylinder and, described
Plant equipment also includes the telescopic control system of the described support oil cylinder of present invention offer.
In addition, the present invention also provides a kind of telescopic control method of the support oil cylinder of engineering machinery, described engineering machinery bag
Include multiple vertical support oil cylinders, wherein, in the plurality of vertical support oil cylinder telescopic process, to the plurality of vertical supporting leg oil
The fast oil-feed of vertical support oil cylinder of expanding-contracting action toggle speed in cylinder or oil return apply hydraulic oil transporting resistance.
By the technique scheme of the present invention, due to for the rodless cavity of vertical support oil cylinder or the oil inlet and oil return of rod chamber
Working oil path on be provided with flow control valve, different with the fluid flow that flows through, this flow control valve can produce difference
Resistance, to adjust the oil inlet and oil return flow of the vertical support oil cylinder that place working oil path connects, so that having different resistances
Vertical support oil cylinder action moment close in addition identical, reduce the probability that plant equipment is tumbled.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram of the telescopic control system of support oil cylinder in prior art；
Fig. 2 is according to a kind of schematic diagram of the telescopic control system of the support oil cylinder of preferred implementation of the present invention；
Fig. 3 is the enlarged drawing of i part in Fig. 2；
Fig. 4 is used for representing the schematic diagram of the expansion control loop of single support oil cylinder in Fig. 2；
Fig. 5 to Fig. 7 is the schematic diagram of the variant embodiment of the expansion control loop of single support oil cylinder in Fig. 4 respectively.
Description of reference numerals
The vertical support oil cylinder of 1 support oil cylinder 1a
1b horizontal support legs oil cylinder 2 first working oil path
3 second working oil path 4 flow speed control valve
5 choke valve 6 switching valve
7 main oil pump 8 emergency pump
9 hydraulic control oil circuit 10 main reversing valve
11 fuel tank 12 check valve
13 supporting leg valve groups
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
With reference to shown in Fig. 2 to Fig. 7, the telescopic control system of the support oil cylinder according to the specific embodiment of the invention, with now
There is technology it is likewise possible to include that there are vertical support oil cylinder 1a and multiple support oil cylinders 1 of horizontal support legs oil cylinder 1b.In order to clear
Chu's ground explanation, multiple vertical support oil cylinder 1a include the first vertical support oil cylinder again and expanding-contracting action toggle speed is slower than described the
Second vertical support oil cylinder of one vertical support oil cylinder.The rod chamber of each described vertical support oil cylinder 1a is connected to first
Working oil path 2, the rodless cavity of each described vertical support oil cylinder 1a is connected to the second working oil path 3, the first working oil path 2
It is connected to shared hydraulic pressure fuel feeding with the second working oil path 3 via each self-corresponding reversing control valve of each vertical support oil cylinder 1a
Element, such as main oil pump 7 or emergency pump 8, can realize each supporting leg oil by the first working oil path 2 and the second working oil path 3
The oil inlet and oil return of cylinder 1, thus realize the expanding-contracting action of telescopic outrigger.Typically, as shown in Fig. 2 above-mentioned vertical support oil cylinder 1a is each
Self-corresponding reversing control valve can be integrated into the supporting leg valve group 13 being formed by banked direction control valves.Right to accompanying drawing 7 below in conjunction with accompanying drawing 4
In the principle explanation that the expansion control loop of single support oil cylinder is carried out, this supporting leg valve group 13 will be split as commutation control
The main reversing valve 10 of valve.
Importantly, in the telescopic control system of the support oil cylinder of the present invention, the of at least described first vertical support oil cylinder
It is provided with flow control valve, this flow control valve is preferably flow speed control valve 4 or throttling in one working oil path 2 or the second working oil path 3
Valve 5, adjusts the hydraulic oil transporting resistance of the first vertical support oil cylinder, thus contracting with the flow-control by this flow control valve
The time difference of the action moment of this first vertical support oil cylinder short and the second vertical support oil cylinder, reduces plant equipment and inclines
The probability turned over.
Specifically, so that the embodiment party of choke valve 5 to be respectively provided with second working oil path 3 of each vertical support oil cylinder 1a
As a example formula, to vertical support oil cylinder 1a rod chamber pumps hydraulic oil when, because resistance difference leads to from the first vertical supporting leg
The The hydraulic oil difference that the rodless cavity of oil cylinder and the second vertical support oil cylinder is discharged is so that flow through the hydraulic pressure oil flow rate of choke valve 5
Also different, thus the hydraulic oil transporting resistance that the choke valve 5 in the second working oil path 3 of the first vertical support oil cylinder produces is more than
The hydraulic oil transporting resistance that choke valve 5 in second working oil path 3 of the second vertical support oil cylinder produces, its result is second to erect
The return flow that the return flow decrement of the rodless cavity of straight support oil cylinder is more than the rodless cavity of the first vertical support oil cylinder reduces
Amount, with the close purpose of the action moment that reaches the vertical support oil cylinder 1a with different resistances.
By above analysis as can be seen that in the telescopic control system of the support oil cylinder of the present invention, flow control valve can be only
Be arranged in the corresponding working oil path of the less vertical support oil cylinder 1a of resistance it is also possible in each vertical support oil cylinder 1a
It is respectively provided with flow control valve in one working oil path 2 or the second working oil path 3.Wherein, when flow control valve is chosen as flow speed control valve 4
When, it is preferably provided in the first working oil path 2, can be acted on in flow speed control valve 4 by the load of vertical support oil cylinder 1a
Uniform-pressure-drop valve produces pressure compensation effect, in this embodiment, can be acted on using the speed governing of flow speed control valve 4 and make difference
Vertically support oil cylinder speed of action is consistent；When flow control valve is chosen as choke valve 5, it is preferably provided at the second working oil path 3
On, its advantage is that it is possible to make the withdrawal action of telescopic outrigger more steady.
Although in addition, it is to be understood that as shown in Fig. 2 the present invention only for vertical support oil cylinder 1a extension and contraction control
Hydraulic oil transporting resistance regulation scheme is proposed but it is also possible to this technical scheme be applied to the extension and contraction control of horizontal support legs oil cylinder 1b
In system, so that the expanding-contracting action opportunity of each horizontal support legs oil cylinder 1b is closer to each other.
When hydraulic oil passes through flow-control valve flow, need to consume portion of energy, this portion of energy will accelerate hydraulic oil
Rotten.Therefore, according to the present invention more preferred embodiment in, flow control valve be located the first working oil path 2 and second
Switching valve 6 is additionally provided with working oil path 3, by the switching of this switching valve 6 optionally to control hydraulic oil to pass through flow control
Valve flow processed.Specifically, when vertical support oil cylinder 1a stretches out, its toggle speed does not interfere with the safety of plant equipment, therefore
Can be switched to using switching valve 6 and so that hydraulic oil obstructed excessively stream control valve is flowed；When vertical support oil cylinder 1a is from the state of stretching out
When (i.e. telescopic outrigger is in holding state) is withdrawn, being switched to using switching valve 6 makes hydraulic oil pass through flow-control valve flow, with
Make each telescopic outrigger shrink toggle speed to reach unanimity.This optimal technical scheme has taken into account the energy consumption of system and equipment
Safety.
By various ways, above-mentioned switching valve 6 can control whether hydraulic oil passes through flow control valve.For example, as Fig. 4 extremely
As shown in Figure 6, flow speed control valve 4 or choke valve 5 can be integrated in switching valve 6, switching valve 6 can have two working positions, its
In, during left position, oil-in is directly connected with oil-out, and during right position, oil-in passes through flow speed control valve 4 with oil-out or choke valve 5 connects.
For another example, as illustrated in fig. 7, flow control valve (as flow speed control valve 4 or choke valve 5) can be made and there is connected state and blocking state
Switching valve 6 in parallel, switching valve 6 has two working positions, and wherein, during left position, oil-in is directly connected with oil-out, hydraulic oil
Mainly flowed by switching valve 6；During right position, oil-in and oil-out block, and hydraulic oil only passes through flow-control valve flow.
In addition, just as described abovely, switching valve 6 should switch over according to actual needs, with take into account system energy consumption and
Equipment safety.In plant equipment, it is usually provided with main oil pump 7 and emergency pump 8, when main oil pump 7 breaks down, can utilize
Emergency pump 8 drives telescopic outrigger action.For avoiding the two to interact, can be respectively provided with unidirectional on respective oil feeding line
Valve 12.The discharge capacity of main oil pump 7 is larger, can quickly meet the traffic demand of all support oil cylinders 1 after startup, each flexible to drive
, the probability that plant equipment tumbles less in supporting leg action.And the discharge capacity of emergency pump 8 is generally less, easily make resistance different
The startup of support oil cylinder 1 there is relatively long time interval, the probability that plant equipment is tumbled is relatively large.Therefore, may be used
So that the telescopic control system of support oil cylinder to be set in emergency pump 8 pumps hydraulic oil to drive vertical support oil cylinder 1a to shrink
Under state, hydraulic oil is made to pass through flow-control valve flow by the switching of switching valve 6.
As shown in Fig. 4, Fig. 5 and Fig. 7, switching valve 6 can be pilot operated directional control valve, and the hydraulic control mouth of this pilot operated directional control valve passes through
Hydraulic control oil circuit 9 is communicated in the force feed mouth of emergency pump 8, thus after emergency pump 8 starts, switching valve 6 is in the direct drive of emergency pump 8
Under commutate to so that hydraulic oil passes through flow-control valve flow.
As another kind of optional embodiment, as shown in fig. 6, switching valve 6 can also be electric control reversing valve, emergency pump 8 leads to
Cross the control of controller (not shown) and start and stop, after emergency pump 8 starts, controller controls switching valve 6 to commutate to making hydraulic pressure
Oil passes through flow-control valve flow.
According to a further aspect in the invention, additionally provide a kind of plant equipment, this plant equipment includes being driven by support oil cylinder
The telescopic control system of the described support oil cylinder of dynamic telescopic outrigger and present invention offer.Typically, described plant equipment is
Crane, pump truck or fire fighting truck.
Additionally, the present invention also provides the telescopic control method of the support oil cylinder of engineering machinery, described engineering machinery includes many
Individual vertical support oil cylinder, in the plurality of vertical support oil cylinder telescopic process, fast to wherein expanding-contracting action toggle speed is vertical
The oil-feed of support oil cylinder or oil return apply hydraulic oil transporting resistance.Preferably, this transporting resistance can pass through vertical accordingly
In first working oil path 2 of support oil cylinder or the second working oil path 3, flow control valve is set and obtains, but the present invention is not limited to
This.
Describe the preferred embodiment of the present invention above in association with accompanying drawing in detail, but, the present invention is not limited to above-mentioned reality
Apply the detail in mode, in the range of the technology design of the present invention, multiple letters can be carried out to technical scheme
Monotropic type, these simple variant belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy no longer separately illustrates.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it equally should be considered as content disclosed in this invention.
Claims (9)
1. a kind of telescopic control system of support oil cylinder, including multiple vertical support oil cylinders (1a), the plurality of vertical supporting leg oil
Cylinder (1a) includes the first vertical support oil cylinder and expanding-contracting action toggle speed is slower than the second of the described first vertical support oil cylinder and erects
Straight support oil cylinder, the rod chamber of each described vertical support oil cylinder (1a) is connected to the first working oil path (2), described in each
Vertically the rodless cavity of support oil cylinder (1a) is connected to the second working oil path (3), each described vertical support oil cylinder (1a)
Described first working oil path (2) and the second working oil path (3) are connected to shared hydraulic pressure via each self-corresponding reversing control valve
Fuel feeding element is it is characterised in that described first working oil path (2) of at least described first vertical support oil cylinder or described second work
Make to be provided with flow control valve on oil circuit (3), adjust described first with the flow-control by this flow control valve and vertically prop up
The hydraulic oil transporting resistance of lower limb oil cylinder, wherein, described first working oil path (2) or described second that described flow control valve is located
Switching valve (6) is provided with working oil path (3), hydraulic oil can optionally be controlled by the switching of this switching valve (6)
By described flow-control valve flow.
2. the telescopic control system of support oil cylinder according to claim 1 is it is characterised in that described flow control valve is to set
Put the flow speed control valve (4) on described first working oil path (2), or, described flow control valve is to be arranged on described second work
Choke valve (5) on oil circuit (3).
3. the telescopic control system of support oil cylinder according to claim 1 is it is characterised in that each described vertical supporting leg is oily
It is provided with described flow control valve on described second working oil path (3) of cylinder (1a)；Or each described vertical support oil cylinder
(1a) described first working oil path (2) is provided with described flow control valve.
4. the telescopic control system of support oil cylinder according to claim 1 is it is characterised in that described flow control valve is integrated
In described switching valve (6)；Or
Described switching valve (6) allows hand over as connected state and blocking state, described flow control valve with described switching valve (6) and
Connection, can control hydraulic oil by described flow control valve or described switching valve (6) by the switching of described switching valve (6)
Flowing.
5. the telescopic control system of support oil cylinder according to claim 1 is it is characterised in that described telescopic control system bag
Include main oil pump (7) and emergency pump (8), in described emergency pump (8) pumps hydraulic oil to drive described vertical support oil cylinder (1a) to receive
In the state of contracting, described switching valve (6) switches to so that hydraulic oil is by described flow-control valve flow.
6. the telescopic control system of support oil cylinder according to claim 5 is it is characterised in that described switching valve (6) is liquid
Control reversal valve, the control mouth of this pilot operated directional control valve is communicated in the force feed mouth of described emergency pump (8) by hydraulic control oil circuit (9).
7. the telescopic control system of support oil cylinder according to claim 5 is it is characterised in that described switching valve (6) is electricity
Control reversal valve, described telescopic control system includes the controller for controlling described emergency pump (8) start and stop, in described emergency pump
(8), after starting, described controller controls described switching valve (6) to switch to so that hydraulic oil is by described flow-control valve flow.
8. plant equipment, including the telescopic outrigger being driven by support oil cylinder it is characterised in that described plant equipment also includes basis
The telescopic control system of the support oil cylinder described in any one in claim 1 to 7.
9. a kind of telescopic control method of the support oil cylinder of engineering machinery, described engineering machinery includes multiple vertical support oil cylinders
(1a) it is characterised in that in the plurality of vertical support oil cylinder (1a) telescopic process, to the plurality of vertical support oil cylinder
(1a) the fast oil-feed of vertical support oil cylinder of the expanding-contracting action toggle speed in or oil return apply hydraulic oil transporting resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410752205.5A CN104632735B (en) | 2014-12-09 | 2014-12-09 | Telescopic control system and method for support oil cylinders and mechanical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410752205.5A CN104632735B (en) | 2014-12-09 | 2014-12-09 | Telescopic control system and method for support oil cylinders and mechanical equipment |
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| CN104632735A CN104632735A (en) | 2015-05-20 |
| CN104632735B true CN104632735B (en) | 2017-02-01 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108457326B (en) * | 2016-06-20 | 2021-02-19 | 靖江市闻达机械有限公司 | Working method for hydraulic control loop of excavator supporting leg structure |
| CN107487736B (en) * | 2017-09-18 | 2023-07-25 | 沈阳农业大学 | Auxiliary platform for high-altitude orchard operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003239903A (en) * | 2002-02-18 | 2003-08-27 | Yaskawa Electric Corp | Actuator driving device |
| JP5351813B2 (en) * | 2010-03-31 | 2013-11-27 | 株式会社クボタ | Working vehicle hydraulic system |
| CN201694173U (en) * | 2010-06-21 | 2011-01-05 | 中国重汽集团济南动力有限公司 | Anti-rollover hydraulic means of self-unloading vehicle |
| CN102536963A (en) * | 2011-12-31 | 2012-07-04 | 长沙中联消防机械有限公司 | Engineering machinery as well as protection method and protection method of landing leg horizontal oil cylinder thereof |
| CN203161689U (en) * | 2013-01-18 | 2013-08-28 | 三一汽车制造有限公司 | Supporting leg and hydraulic system thereof and engineering machinery |
| CN203604293U (en) * | 2013-11-28 | 2014-05-21 | 中联重科股份有限公司 | Engineering mechanical equipment and hydraulic control circuit thereof |
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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 Co., Ltd Address before: 410200 No. 997, Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian fire fighting Machinery Co., Ltd Patentee before: Zoomlion Heavy Industry Co., Ltd |