CN201195671Y - Gravity force type hydraulic crane - Google Patents

Gravity force type hydraulic crane Download PDF

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Publication number
CN201195671Y
CN201195671Y CNU2008200629013U CN200820062901U CN201195671Y CN 201195671 Y CN201195671 Y CN 201195671Y CN U2008200629013 U CNU2008200629013 U CN U2008200629013U CN 200820062901 U CN200820062901 U CN 200820062901U CN 201195671 Y CN201195671 Y CN 201195671Y
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CN
China
Prior art keywords
arm
hydraulic
hinge
seat
actuating cylinder
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Expired - Fee Related
Application number
CNU2008200629013U
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Chinese (zh)
Inventor
陈炯
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陈炯
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Priority to CNU2008200629013U priority Critical patent/CN201195671Y/en
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Publication of CN201195671Y publication Critical patent/CN201195671Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a gravity type hydraulic crane which takes a common hydraulic crane as a machine body and is composed of a main boom, a balance cargo boom, a cargo boom seat, an amplitude hydraulic cylinder and a hydraulic winch which are installed. The rear end of the main boom and a hinge of the balance cargo boom are connected into a folding cargo boom, the cargo boom seat is installed on a rotary platform, and a hinge shaft on the main boom is installed in a hinge hole seat on the cargo boom seat and is installed in a lever mode. A piston rod of the amplitude hydraulic cylinder and the hinge of a hinge hole on the rear end of the main boom are connected, and the tail end of the amplitude hydraulic cylinder and the hinge of a hinge seat which is installed on the rotary platform are connected. The hinge seat on the middle portion of the balance cargo boom and one end of a lifting plate are connected, and the other end of the lifting plate and the hinge of the hinge shaft in a long guide path on the rear end of the main boom are connected. The tail end of a jacking hydraulic cylinder is installed on the middle rear end of the main boom and the hinge shaft in the long guide path is installed in the hinge seat of the piston rod of the jacking hydraulic cylinder. The hydraulic winch is installed on the balance cargo boom, one end of a steel cable of the hydraulic winch is coiled around a fixed pulley block on the front end of the cargo boom to connect a hook of a movable pulley block.

Description

The gravity-type hydraulic crane
Technical field
The utility model relates to a kind of gravity-type hydraulic crane, and the gravity-type hydraulic crane adopts collapsible arm, has balance arm and moving counterweight.There is value of service widely at special lifting scene in urban construction, development of real estate, transport development, hydraulic and electric engineering, petrochemical complex, metallurgical mine construction project.
Technical background
The arm of common hydraulic crane is that more piece is sleeved on telescopic hoist boom together, and arm can not fold.The arm lower end is connected with the rotation platform hinge, and the piston end of arm hydraulic actuating cylinder is connected with lower end hinge in the arm, and luffing hydraulic actuating cylinder tail end is connected with the rotation platform hinge.Counterweight is fixedly mounted on the rear end of hydraulic crane rotation platform, and the position can not change.
When common hydraulic crane hangs the form hoisting heavy with cantilever, hoisting heavy will make hydraulic crane be in rollover conditions to gravitational moment of tumbling of hydraulic crane effect.This lifting gravitational moment is made hydraulic crane keep stable by the lifting balancing torque institute balance that hydraulic crane has.The lifting moment of hydraulic crane is made of the product of the lifting arm of force and fuselage gravity: the distance between the center-of-gravity position of fuselage and the hydraulic pressure leg is the lifting force arm lengths, and hydraulic crane weight and counterweight weight sum are fuselage gravity.Fix because of lifting force arm lengths and hydraulic crane weight, counterweight, therefore, the lifting moment of hydraulic crane is a fixed value.When the lifting gravitational moment of hoisting heavy increases, have only by operation luffing hydraulic actuating cylinder to change the arm elevation angle, to shorten lifting weight arm vertical length mode, reduce the lifting gravitational moment and tumble to prevent hydraulic crane.Because the lifting balancing torque of hydraulic crane is a fixed value, along with the increase of hoisting heavy weight, the lifting safety factor is reducing gradually, is unfavorable for safe lifting.For the safety lifting, along with the increase of hoisting weight, the length of hydraulic crane, width and weight all increase, to increase the lifting balancing torque.But the driving power of common hydraulic crane is increased, and fuel oil consumption increases.
Common hydraulic crane is when the on-the-spot use of special construction, because the hydraulic pressure leg can not stretch out fully, the best lifting position can not be put in the lifting position, does not bring into play maximum lifting moment; Or because of the needs of mounting process, arm must satisfy the requirement that workpiece is installed horizontal throw with the less lifting of angle over the ground workpiece.In above-mentioned special lifting operation, common hydraulic crane can not lift, and as lifting by force, will violate the hydraulic crane safety regulation for operations and will cause the accident.For lifting operation safety,, all must select the large-tonnage hydraulic crane of crane capacity greater than weight weight several times even lift the weight of little weight.And the large-tonnage hydraulic crane is because length and width increase, and volume increases, and can't use in special camp site.
During common hydraulic crane hoisting heavy, the luffing hydraulic actuating cylinder supports arm, and the lifting gravitational moment all acts on the luffing hydraulic actuating cylinder, when promoting the overhanging change arm of the luffing hydraulic cylinder piston rod elevation angle, needs very high-voltage hydraulic pressure.Constitute hydraulic efficiency pressure system Hydraulic Elements---Hydraulic Pump, pressure-gradient control valve, flow-controlling gate, directional control valve, hydraulic actuating cylinder etc. had both needed to select the very grade of High Voltage, need very big flow again, this will cause the hydraulic efficiency pressure system price to increase, and the hydraulic crane productive costs increases.
Above-mentioned reason has limited the use of common hydraulic crane in special construction scene, special lifting operation of adopting prior art: in narrow camp site, must select the large-tonnage hydraulic crane to the lifting of little tonnage weight, workpiece; Low weight when weight, workpiece weight, but the horizontal throw that lifting is installed can only be used the lifting of large-tonnage hydraulic crane when bigger.Like this, both increased preparation of construction and purchased fund, the driving power of common hydraulic crane is increased, energy consumption increases, and the hydraulic crane productive costs increases.
Summary of the invention
In the lifting process,, in special lifting scene, special lifting operation, can not use hydraulic crane productive costs height, the deficiency that fuel oil consumption is big at the common hydraulic crane that adopts prior art because fuselage bears very big tilting moment.The purpose of this utility model is: a kind of gravity-type hydraulic crane is provided, with special boom structure and arm mounting means, under the prerequisite of lifting identical weight, reduce the tilting moment that bears, driving power, fuel oil consumption and the hydraulic crane productive costs of gravity-type hydraulic crane, be implemented in special lifting scene, the special lifting operation, lift weight easily and safely.
The above-mentioned purpose of wood utility model is achieved in that the gravity-type hydraulic crane is a body with common hydraulic crane, be made up of main arm, balance arm, arm seat, luffing hydraulic actuating cylinder, hydraulic wireline winch, moving counterweight, main arm rear end and balance arm front end hinge connect to form collapsible arm.Remove former arm and hydraulic wireline winch, the arm seat of being made up of pedestal, pan seat is installed on the hydraulic crane turn table.Hinge axis is installed in two sides in the middle rear end of main arm, and hinge seat is installed on top, the two sides processing of the rear end long guide groove that slides, piston rod connection pan.The hinge axis that install the rear end in the collapsible arm is placed on the interior one-tenth of the pan seat lever mode on the arm seat.The piston rod of luffing hydraulic actuating cylinder is connected with main arm rear end pan hinge, and the hinge seat hinge of installing on the tail end of luffing hydraulic actuating cylinder and the turn table is connected.The balance arm is made up of equilibrium arm guide groove, displacement hydraulic actuating cylinder, equilibrium arm, counterbalanced weight, lifting body.The hinge seat at balance arm middle part is connected with an end of raising plate, and the interior hinge axis hinge of the other end of raising plate and the long guide groove of main arm rear end is connected.Jacking hydraulic actuating cylinder tail end is installed in the middle rear end of main arm, and the hinge axis in the long guide groove is installed in the hinge seat of jacking hydraulic cylinder piston rod.Hydraulic wireline winch is installed on the balance arm, and an end of hydraulic wireline winch cable wire connects the running block suspension hook around main arm front end fixed pulley group.Luffing hydraulic actuating cylinder, hydraulic wireline winch connect the hydraulic control circuit of cooresponding common hydraulic crane respectively.Displacement hydraulic actuating cylinder, jacking hydraulic actuating cylinder connect newly-increased separately hydraulic control circuit respectively, and moving counterweight is placed on the turn table and is assembled into the gravity-type hydraulic crane with bolt.
Adopt technique scheme, the hinge axis of collapsible arm is installed in the arm seat, becomes the lever installation form.Use gravity-type hydraulic crane hoisting heavy, operation luffing hydraulic actuating cylinder makes the arm luffing, when the counterbalanced weight lower end of balance arm rear end during near the counterweight upper end, with mount pin counterweight is connected with the counterbalanced weight hinge.Operation lifting body, raising plate jack-up balance arm make it become horizontality.During hoisting heavy, in advance balance arm counterbalanced weight level is released, be installed in that hydraulic wireline winch because of having increased the lifting force arm lengths, has greatly increased the lifting counterbalance moment also along with level is released on the balance arm, equal crane capacity is increased.Hoisting heavy is suspended in the running block suspension hook, and operation hydraulic wireline winch coiling steel cable has lifted by crane weight.The lifting gravitational moment that hoisting heavy produces, balance arm gravitational moment institute balance by the arm seat other end, the gravitational moment of hoisting heavy does not all act on the gravity-type hydraulic crane, and is very little to the roll-over action of gravity type boat davit hydraulic crane, the safety that has improved equal crane capacity.Therefore, suit very much in special lifting scene, special lifting operation, to use, needn't lift little weight weight, saved large-tonnage lifting appliance purchase commodity with the large-tonnage hydraulic crane.Because during hoisting heavy, the luffing hydraulic actuating cylinder not exclusively bears up the effect of lift heavy moment, promote the overhanging change arm of the luffing hydraulic cylinder piston rod elevation angle, only need lower hydraulic pressure.Hydraulic Pump, pressure-gradient control valve, flow-controlling gate, directional control valve, hydraulic actuating cylinder etc. do not need to select the very grade of High Voltage, and hydraulic efficiency pressure system driving power, productive costs descend, and then hydraulic crane fuel oil consumption, productive costs are descended.
Description of drawings
Specifically describe adopting embodiment of the present utility model below in conjunction with accompanying drawing, wherein:
Fig. 1 adopts gravity-type hydraulic crane front view of the present utility model.
Fig. 2 adopts gravity-type hydraulic crane lifting method of the present utility model.
Label 1 is an arm, the 2nd among Fig. 1, luffing hydraulic actuating cylinder, the 3rd, arm seat, the 4th, permanent seat, the 5th, raising plate, the 6th, hinge seat, the 7th, hydraulic wireline winch, the 8th, balance arm, the 9th, counterweight, the 10th, counterbalanced weight.
The specific embodiment
As shown in Figure 1, the gravity-type hydraulic crane is to reequip with common hydraulic crane: form the gravity-type hydraulic crane by hydraulic crane body, main arm, balance arm, arm seat, luffing hydraulic actuating cylinder, hydraulic wireline winch, counterweight.
As shown in Figure 1, the making of the telescopic hoist boom of common hydraulic crane, assembling, stretch mode, the professional and technical personnel is quite familiar to this, repeats no more.Only the rear end facing to main arm elaborates, and the rear end of main arm is made up of a segment type steel and hinge axis.Shaped steel adopts steel plate to be welded into the same with the arm cross sectional shape, mounting hole at front end two sides installation and processing jacking hydraulic actuating cylinder, the mounting hole of middle part installation and processing hinge axis, the long guide groove of two sides processing slip of rear end, luffing hydraulic cylinder piston rod bonded assembly pan.Hinge axis is made up of axle and connecting panel, and axle adopts No. 45 steel processing, one section short keyway of end processing.Connecting panel adopts No. 20 steel plates to be processed into disc, disk endoporus processing keyway, the hole of the circumference installation and processing of disk.Axle connects with key, is pressed into the endoporus of connecting panel, and hinge axis is fixed on the shaped steel middle part with the bolted connection of interference.Shaped steel is sleeved on the rear end of arm, adopts the bolted connection of interference fixedly to be assembled into main arm.
As shown in Figure 1, the balance arm is made up of equilibrium arm guide groove, displacement hydraulic actuating cylinder, equilibrium arm, counterbalanced weight, lifting body.The equilibrium arm guide groove adopts the section steel manufacture of square-section, at two sides, rear end welded and installed hinge axle bed.The displacement hydraulic actuating cylinder is installed in the equilibrium arm guide groove, and the tail end of displacement hydraulic actuating cylinder and an end of equilibrium arm guide groove are connected with pin hinge, pin with gland.Equilibrium arm adopts the section steel manufacture of square-section, the link pin of two sides processing at one end mounting hole.Counterbalanced weight adopts cast iron to make the rectangular shape of band arc, and the cuboid lower end of band arc processes pan, and counterbalanced weight is connected with equilibrium arm with bolt.Equilibrium arm inserts in the equilibrium arm guide groove, and the piston rod head end of displacement hydraulic actuating cylinder is connected with pin hinge with an end of equilibrium arm, pins with gland.The equilibrium arm side is installed upright steel plate and is stretched out in the equilibrium arm guide groove, and hydraulic wireline winch is installed.Lifting body is made up of jacking hydraulic actuating cylinder, raising plate, and raising plate adopts steel plate to make, and cross sectional shape is "T"-shaped, two ends processing pan.
As shown in Figure 1, the hinge seat of installing on the rear end in balance arm front end and the main arm is connected with pin hinge, the jacking hydraulic actuating cylinder is installed in the main arm, the tail end of jacking hydraulic actuating cylinder is connected with pin hinge with main arm, the jacking hydraulic cylinder piston rod head end axis of guide of packing into, axis of guide two ends installation shaft takes up in the long guide groove of arm rear end.The two ends of the axis of guide are connected with an end hinge of two raising plates respectively, and the other end of two raising plates is connected with the hinge axle bed hinge of equilibrium arm guide groove two sides respectively.
As shown in Figure 1, the arm seat is made up of pedestal, pan seat.Pedestal adopts steel plate to be made into triangle, and gusset is strengthened in the two sides welding, and the circular arc that the pan seat is installed is processed on top, bottom and adapter plate welding, processing mounting holes on the adapter plate.The pan seat adopts thick walled steel tube processing, separately welds adapter plate at split, bolt up, the plain bearing of the brass processing pan seat of packing into.The pan seat is welded on pedestal top, and the welding brace panel is connected with pedestal below the pan seat.
As shown in Figure 1, moving counterweight adopts cast iron to make the rectangular shape of band arc, and the cuboid upper end of band arc processes pan, and arcwall face and bottom thread mill drilling are fixed by bolts on the turn table.
As shown in Figure 1, hydraulic wireline winch is made up of HM Hydraulic Motor, worm reducer, winch spool, winch spool support, and winch spool is bearing on the winch spool support, and HM Hydraulic Motor connects the worm reducer input shaft, and the worm reducer output shaft connects winch spool, and the lifting steel cable is wrapped on the winch spool.
Luffing hydraulic actuating cylinder, jacking hydraulic actuating cylinder, displacement hydraulic actuating cylinder, HM Hydraulic Motor are selected for use and are met the Hydraulic Elements that are stranded tame standard.
The gravity-type hydraulic crane utilizes the hydraulic efficiency pressure system of common hydraulic crane, increases commutation loop, the locking loop of displacement hydraulic actuating cylinder, jacking hydraulic actuating cylinder, is connected in parallel on original hydraulic system.Described in " engineering machinery hydraulic and hydraulic transmission ", " mechanical design handbook " literary composition, in selected commutation loop, locking loop, and behind the control element such as multiple directional control valve, the connection of its control element in hydraulic efficiency pressure system, can connect by the using method of element regulation, the professional and technical personnel is quite familiar to this, repeats no more.
As shown in Figure 1, be body with common hydraulic crane, the arm seat is installed on the rotation platform of hydraulic crane, and the hinge axis on the main arm is installed in the pan seat on the arm seat, and main arm rear end is connected with luffing hydraulic cylinder piston rod hinge.The balance arm is connected with main arm hinge, and hydraulic wireline winch is installed on the balance arm, and an end of hoist line connects movable pulley master suspension hook around main arm front end leading sheave, and the tail end of luffing hydraulic actuating cylinder is connected with the rotation platform hinge.Luffing hydraulic actuating cylinder, hydraulic wireline winch connect the hydraulic control circuit of cooresponding common hydraulic crane respectively.Displacement hydraulic actuating cylinder, jacking hydraulic actuating cylinder connect newly-increased separately hydraulic control circuit respectively.
As shown in Figure 2, the gravity-type hydraulic crane is in common lifting operation, and is the same with the operation of common hydraulic crane.When special lifting operation is carried out at special lifting scene, at first operate the luffing hydraulic actuating cylinder arm that hoists, operation jacking hydraulic actuating cylinder, raising plate remains on horizontality with balance arm jack-up, operation equilibrium arm displacement hydraulic actuating cylinder, equilibrium arm level in the equilibrium arm guide groove is stretched out the length that increases the lifting balance arm of force, be installed in the length that the hydraulic wireline winch on the balance arm also lifts by crane the balance arm of force along with the parallel motion increase, greatly increased the lifting gravitational moment, under the prerequisite that guarantees the lifting safety, equal crane capacity is greatly increased.Gravity-type hydraulic hangs the hoisting heavy of using lever balance theory, the lifting gravitational moment of hoisting heavy acts on an end of collapsible arm, the counterbalance moment of balance arm act on the other end of collapsible arm, by the heavy position of shifting balance, make the collapsible arm state that tends to balance substantially.The luffing hydraulic actuating cylinder is controlled collapsible arm operation, and when the heavy weight weight of lifting, additional part is lifted by crane moment.Therefore, suit very much in special lifting scene, special lifting operation, to use.
Above-described is to adopt the utility model principle, is produced on when cutting down the consumption of energy, and is implemented in special construction scene, the special lifting operation, lifts the gravity-type hydraulic crane optimization embodiment of weight fast, easily and safely.Should be pointed out that for a person skilled in the art, under the prerequisite that does not break away from the utility model principle, can also make some modification and improvement,, also should be considered as belonging to protection domain of the present utility model so that develop other product.

Claims (6)

1. gravity-type hydraulic crane, described gravity-type hydraulic crane comprises body, luffing hydraulic actuating cylinder, the hydraulic wireline winch of rubber-tyred, crawler type hydraulic crane, it is characterized in that also having main arm, balance arm, arm seat, moving counterweight; Concrete structure is: main arm rear end and balance arm front end hinge connect into collapsible arm, remove former arm and hydraulic wireline winch, the arm seat is installed on the turn table of hydraulic crane, the hinge axis that install the lower end in the collapsible arm is placed in the pan seat on the arm seat, the piston rod of luffing hydraulic actuating cylinder is connected with main arm rear end pan hinge, the hinge seat hinge of installing on the tail end of luffing hydraulic actuating cylinder and the turn table is connected, the hinge seat hinge of installing on one end of balance arm and the main arm is connected, the hinge seat at balance arm middle part is connected with an end of raising plate, hinge axis hinge in the long guide groove of the other end of raising plate and main arm rear end is connected, jacking hydraulic actuating cylinder tail end is installed in the middle rear end of main arm, hinge axis in the long guide groove is installed in the hinge seat of jacking hydraulic cylinder piston rod, hydraulic wireline winch is installed on the balance arm, one end of hydraulic wireline winch cable wire is around main arm front end fixed pulley group, connect the running block suspension hook, the luffing hydraulic actuating cylinder, hydraulic wireline winch connects the hydraulic control circuit of cooresponding common hydraulic crane respectively, the displacement hydraulic actuating cylinder, the jacking hydraulic actuating cylinder connects newly-increased separately hydraulic control circuit respectively, and moving counterweight is placed on and uses bolt on the turn table.
2. gravity-type hydraulic crane as claimed in claim 1, the rear end that it is characterized in that main arm is made up of a segment type steel and hinge axis, shaped steel adopts steel plate to be welded into the same with the arm cross sectional shape, mounting hole at front end two sides installation and processing jacking hydraulic actuating cylinder, the mounting hole of middle part installation and processing hinge axis, the long guide groove of two sides processing slip of rear end, luffing hydraulic cylinder piston rod bonded assembly pan, hinge axis is made up of axle and connecting panel, and axle adopts No. 45 steel processing, one section short keyway of end processing, connecting panel adopts No. 20 steel plates to be processed into disc, disk endoporus processing keyway, the hole of the circumference installation and processing of disk, axle connects with key, be pressed into the endoporus of connecting panel, hinge axis is fixed on the shaped steel middle part with the bolted connection of interference, and shaped steel is sleeved on the rear end of arm, adopts the bolted connection of interference fixedly to be assembled into main arm.
3. gravity-type hydraulic crane as claimed in claim 1 is characterized in that the balance arm is made up of equilibrium arm guide groove, displacement hydraulic actuating cylinder, equilibrium arm, counterbalanced weight, lifting body; The equilibrium arm guide groove adopts the section steel manufacture of square-section, at two sides, rear end welded and installed hinge axle bed, the displacement hydraulic actuating cylinder is installed in the equilibrium arm guide groove, the tail end of displacement hydraulic actuating cylinder and an end of equilibrium arm guide groove are connected with pin hinge, pin with gland, equilibrium arm adopts the section steel manufacture of square-section, the link pin of two sides processing at one end mounting hole, counterbalanced weight adopts cast iron to make the rectangular shape of band arc, counterbalanced weight is connected with equilibrium arm with bolt, equilibrium arm inserts in the equilibrium arm guide groove, the piston rod head end of displacement hydraulic actuating cylinder is connected with pin hinge with an end of equilibrium arm, pin with gland, the equilibrium arm side is installed upright steel plate and is stretched out in the equilibrium arm guide groove, and hydraulic wireline winch is installed, lifting body is by the jacking hydraulic actuating cylinder, raising plate is formed, raising plate adopts steel plate to make, and cross sectional shape is "T"-shaped, two ends processing pan.
4. gravity-type hydraulic crane as claimed in claim 1 is characterized in that the arm seat is made up of pedestal, pan seat; Pedestal adopts steel plate to be made into triangle, gusset is strengthened in the two sides welding, the circular arc that the pan seat is installed is processed on top, bottom and adapter plate welding, processing mounting holes on the adapter plate, the pan seat adopts thick walled steel tube processing, separately weld adapter plate at split, bolt up, the plain bearing of the brass processing pan seat of packing into, the pan seat is welded on pedestal top, and the welding brace panel is connected with pedestal below the pan seat.
5. gravity-type hydraulic crane as claimed in claim 1 is characterized in that hydraulic wireline winch is made up of HM Hydraulic Motor, worm reducer, winch spool, winch spool support; Winch spool is bearing on the winch spool support, and HM Hydraulic Motor connects the worm reducer input shaft, and the worm reducer output shaft connects winch spool, and the lifting steel cable is wrapped on the winch spool.
6. gravity-type hydraulic crane as claimed in claim 1 is characterized in that counterweight adopts cast iron to make the rectangular shape of band arc, and the cuboid upper end of band arc processes pan, arcwall face and bottom thread mill drilling.
CNU2008200629013U 2008-04-14 2008-04-14 Gravity force type hydraulic crane Expired - Fee Related CN201195671Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008200629013U CN201195671Y (en) 2008-04-14 2008-04-14 Gravity force type hydraulic crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008200629013U CN201195671Y (en) 2008-04-14 2008-04-14 Gravity force type hydraulic crane

Publications (1)

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CN201195671Y true CN201195671Y (en) 2009-02-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865094A (en) * 2009-04-14 2010-10-20 阮其田 Device for reducing nearly suspended load by using human walk gravity as hydraulic boosting energy
CN102826465A (en) * 2012-09-11 2012-12-19 三一集团有限公司 Rotary counter weight mechanism and crane
CN102942126A (en) * 2012-11-19 2013-02-27 徐州重型机械有限公司 Balance arm of tower-type crane and tower-type crane
CN110844802A (en) * 2019-10-28 2020-02-28 中船华南船舶机械有限公司 Omnidirectional multifunctional intelligent emergency rescue vehicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865094A (en) * 2009-04-14 2010-10-20 阮其田 Device for reducing nearly suspended load by using human walk gravity as hydraulic boosting energy
CN101865094B (en) * 2009-04-14 2013-04-10 阮其田 Device for reducing nearly suspended load by using human walk gravity as hydraulic boosting energy
CN102826465A (en) * 2012-09-11 2012-12-19 三一集团有限公司 Rotary counter weight mechanism and crane
CN102942126A (en) * 2012-11-19 2013-02-27 徐州重型机械有限公司 Balance arm of tower-type crane and tower-type crane
CN110844802A (en) * 2019-10-28 2020-02-28 中船华南船舶机械有限公司 Omnidirectional multifunctional intelligent emergency rescue vehicle

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090218

Termination date: 20100414