CN102408073B - Crane and anti-tipback cylinder thereof - Google Patents
Crane and anti-tipback cylinder thereof Download PDFInfo
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- CN102408073B CN102408073B CN201010292707.6A CN201010292707A CN102408073B CN 102408073 B CN102408073 B CN 102408073B CN 201010292707 A CN201010292707 A CN 201010292707A CN 102408073 B CN102408073 B CN 102408073B
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Abstract
The invention discloses an anti-tipback cylinder comprising a cylinder barrel (1), a cylinder rod (2) and a cylinder rod piston (3). The cylinder rod piston (3) divides a cavity body of the cylinder barrel (1) into a rodless cavity (11) and a rod cavity (12), and the cylinder rod (2) is provided with a cylinder rod inner cavity (21); an oil-gas separation piston (22) is arranged in the cylinder rod inner cavity (21) and divides the cylinder rod inner cavity (21) into a first inner cavity (211) and a second inner cavity (212); and the cylinder rod piston (3) is provided with damping holes (31), hydraulic oil is filled in the rodless cavity (11), and gas is filled in the second inner cavity (212). On the one hand, the anti-tipback cylinder has higher working reliability and can realize two limit positions of maximum travel and dead travel, thus the total length of the design of the anti-tipback cylinder is reduced; on the other hand, the anti-tipback cylinder has the advantages of simple structure, small floor space and convenience for mounting. Furthermore, the invention further discloses a crane comprising the anti-tipback cylinder.
Description
Technical field
The present invention relates to hoisting crane technical field, particularly a kind of anti-tipback cylinder.The invention still further relates to a kind of hoisting crane that comprises described anti-tipback cylinder.
Background technology
In large-tonnage, super-tonnage all terrain crane, relation between brachium and lifting performance is a kind of contradictory relation, although highly reached requirement when long-armed, but load-carrying ability is limited, generally only have tens tons, can not meet current demand far away, also not embody the performance advantage of large-tonnage, super-tonnage crane simultaneously.The lifting performance of hoisting crane when long-armed in order to promote, tower arm arises at the historic moment, and nowadays, tower arm has become must being equipped with of large-tonnage, super-tonnage all terrain crane and has put.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of a kind of typical all terrain crane in prior art; Fig. 2 is the annexation schematic diagram of anti-tipback cylinder and tower arm and principal arm in prior art.
As shown in Figure 1, the tower arm 3' that full Terrain Cranes comprises principal arm 1' and is connected with principal arm 1', as shown in Figure 2, principal arm 1' top is provided with link span 1'1, anti-tipback cylinder 2' one end is connected with link span 1'1, the other end is connected with front variable amplitude support assembly 6'1, and link span 1'1 is also connected with rear variable amplitude support assembly 6'2, is provided with arm-tie assembly 5'1 between former and later two bracket assemblys.As shown in Figure 1, tower arm luffing elevator assembly 4'1 pulls arm-tie assembly 5'1 by luffing assembly pulley 4'2 under the drive of motor, and arm-tie assembly 5'1 pulls tower arm 3' luffing by front arm-tie assembly 5'2.When tower arm 3' wide-angle luffing, if the not anti-tipback cylinder 2' of front variable amplitude support assembly 6'1 supports, will cause whole tower arm 3' hypsokinesis, and then roll-over accident likely occurs, therefore anti-tipback cylinder 2' guarantees that tower arm 3' carries out the important structure part of safe luffing.
Please refer to Fig. 3, Fig. 3 is the structural representation of a kind of oil cylinder balance cock compound type anti-squat system in prior art.
Oil cylinder balance cock compound type anti-squat system is mainly comprised of balance cock and oil cylinder, and oil cylinder is used for support tower arm and prevents hypsokinesis, and balance cock is controlled the opening amount of balance cock by controlling the size of electric current, and then controls the variation of the large chamber 2'1 of oil cylinder.
During the hypsokinesis of tower arm, (1), the change procedure of pressure is: the hypsokinesis of tower arm causes the large chamber of oil cylinder 2'1 pressurized, pressure raises, now oil cylinder length needs to shorten, to coordinate the increase of tower arm angle, in the process shortening at oil cylinder, large chamber 2'1 must guarantee enough pressure, and this just need to control size and then the control presssure of balance cock restriction by controlling the size of electric current, to meet the product of large chamber 2'1 pressure and area, be greater than the required support reaction of tower arm; (2), the change procedure of flow is: the hypsokinesis of tower arm causes large chamber 2'1 pressed volume to reduce, and flow flows out by balance cock restriction, oil cylinder loculus 2'2 is carried out to repairing simultaneously, to guarantee that oil cylinder loculus 2'2 does not inhale sky.
When tower arm leans forward, (1), the change procedure of pressure is: when tower arm leans forward, need to promote variable amplitude support assembly, so that tower arm elevator put rope can tensioner, disorder cable not, this just requires the large chamber 2'1 of oil cylinder to have enough pressure, therefore can supply pressure oil to meet pressure demand by the change-over valve commutation being connected with pump, loculus 2'2 connects fuel tank simultaneously, oil return smoothly; (2), the change procedure of flow is: large chamber 2'1 increases, and required flow increases, and commutated and provided enough flows by pump, and loculus 2'2 reduces oil return by change-over valve.
Above-mentioned oil cylinder balance cock convolution anti-squat system needs outside oil sources, when box-shaped arm is stretched entirely, brachium is generally more than 80 meters, and oil sources must obtain from pump, pump is connected with driving engine, this length requirement when requiring enough large hose reel to meet full semi-girder, and so large reel need to take very large installing space, this all terrain crane to space compactness is a stern challenge, may realize hardly.In addition, huge reel also can increase the weight of complete machine, reduces lift heavy amount, for the lifting of performance, is a negative factor.Moreover the prolongation of pipeline also can cause the reduction of anti-hypsokinesis oil cylinder responding ability, 80 meters of above length responses are very slow, once there is emergency, will be difficult to control.Finally, the electric current of controlling electric proportional balancing valve has determined the size of the large cavity pressure of oil cylinder, and the required pressure in the large chamber of oil cylinder changes with cylinder is long, this just requires the size of electric current will carry out adjustment at any time, this adjustment needs more accurate calculating, yet this more accurate calculating has implemented larger difficulty.
Please refer to Fig. 4, Fig. 4 is the structural representation of the anti-hypsokinesis spring cylinder of a kind of embedded with spring in prior art.
In the process of tower arm hypsokinesis, the hypsokinesis of tower arm will make spring cylinder 7' stroke shorten, until dead journey, at whole process medi-spring, always in pressured state, spring force prevents the hypsokinesis of tower arm as reaction of bearing.In the process leaning forward at tower arm, leaning forward of tower arm can make spring cylinder 7' stroke increase, until range, in whole process, the amount of compression producing in the pre compressed magnitude of spring and hypsokinesis process is released, and spring force also promotes leaning forward of tower arm as thrust simultaneously.
The anti-hypsokinesis spring cylinder of above-mentioned embedded with spring 7' is due to the bearing force that adopts spring force as the hypsokinesis of tower arm, therefore once spring is determined, the support reaction that whole spring cylinder 7' can provide in compression process is also just determined, so just needed more accurate tower arm hypsokinesis support reaction before making anti-hypsokinesis spring cylinder, if error is larger, will cause spring cylinder 7' can not provide tower arm required anti-hypsokinesis support reaction, whole anti-hypsokinesis spring cylinder 7' will scrap in this case.In addition, in the process of tower arm hypsokinesis, anti-hypsokinesis support reaction is to reduce gradually along with the long shortening of cylinder, it is a kind of directly proportional relation, but not inverse proportional relation, and the long variation of spring force and cylinder is inverse proportional relation, therefore this required maximum support reaction of tower arm when requiring spring will have enough pre compressed magnitudes to provide anti-hypsokinesis spring cylinder 7' the longest, this just causes spring design difficulty, can not make full use of the compression property of spring.Moreover the most important is to work as spring-compressed on earth, spring length has taken the stroke of too many cylinder, and cylinder can not be compressed at the end, so also just can not make full use of the whole stroke of anti-hypsokinesis spring cylinder.Finally, go all out to reach as high as hundreds of tons after the tower arm of large-tonnage, super-tonnage crane, spring is difficult to provide so large power to realize anti-hypsokinesis function.
In sum, guarantee simple in structure, take up space on basis little, easy for installation, how to improve the reliability of anti-tipback cylinder work, and can make anti-tipback cylinder can realize range and dead two end positions of journey, thereby the overall length that reduces anti-tipback cylinder design is the problem that those skilled in the art need solution badly.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of anti-tipback cylinder, and this anti-tipback cylinder has higher functional reliability on the one hand, and can realize range and dead two end positions of journey, thereby reduces the overall length of anti-tipback cylinder design; On the other hand simple in structure, take up space little, easy for installation and cost is lower.In addition, another technical matters that will solve of the present invention is for providing a kind of hoisting crane that comprises above-mentioned anti-tipback cylinder.
For solving the problems of the technologies described above, the invention provides a kind of anti-tipback cylinder, for hoisting crane, comprise cylinder barrel, cylinder bar and cylinder bar piston, the cavity that described cylinder bar piston is separated described cylinder barrel is rodless cavity and rod chamber, described cylinder bar is provided with cylinder bar inner chamber; In described cylinder bar inner chamber, be provided with movably Oil-gas Separation piston, described Oil-gas Separation piston is separated described cylinder bar inner chamber near the first inner chamber of described cylinder bar piston one side and away from the second inner chamber of described cylinder bar piston one side; Described cylinder bar piston is provided with the damping hole that is communicated with described rodless cavity and described the first inner chamber, in described rodless cavity, is filled with hydraulic oil, in described the second inner chamber, is filled with gas.
Preferably, described cylinder barrel is provided with cylinder bottom, and described cylinder bottom is provided with the oil-filled hole being communicated with described rodless cavity, and described oil-filled hole is connected with fuel delivery device.
Preferably, described cylinder bottom is also provided with survey oil pressure hole, and described survey oil pressure hole is connected with oil pressure detecting device.
Preferably, described cylinder bar is provided with bar head, and described bar head is provided with the air-filled pore being communicated with described the second inner chamber, and described air-filled pore is connected with air delivery device.
Preferably, described bar head is also provided with survey pressure hole, and described survey pressure hole is connected with pressure test device.
Preferably, described pressure test device is provided with warning device; When the pressure of described the second inner chamber detecting when described pressure test device is less than predetermined value, described warning device sends alerting signal.
Preferably, the tower arm elevator that described hoisting crane is provided with control setup and is connected with described control setup, described warning device is connected with control setup, so that described control setup sends the instruction of slowing down or braking to described tower arm elevator according to described alerting signal.
Preferably, also comprise:
Position detecting element, the position for detection of described cylinder bar in retraction process, and send signal;
Control element, the signal sending for receiving described position detecting element, and send instruction according to this signal;
When described cylinder bar bounces back to the primary importance that approaches its end of run, described position detecting element sends first signal, and the tower arm elevator that described control element is controlled described hoisting crane according to described first signal slows down;
When described cylinder bar further bounces back to the second place that approaches its end of run, described position detecting element sends secondary signal, and described control element is controlled the tower arm elevator braking of described hoisting crane according to described secondary signal.
Preferably, described position detecting element comprises the first detector switch, the second detector switch and detection piece, and described the first detector switch and described the second detector switch are installed on described cylinder barrel, and described detection piece is installed on described cylinder bar;
When described the first detector switch detects described detection piece, described the first detector switch sends described first signal;
After the schedule time, when described the second detector switch detects described detection piece, described the second detector switch sends described secondary signal.
Preferably, the end of described cylinder barrel is provided with mounting bracket, and described mounting bracket comprises the extension that stretches out described cylinder barrel end; Described the first detector switch is installed on the outer end of described extension, and described the second detector switch is installed on the inner of described extension.
In addition, for solving the problems of the technologies described above, the present invention also provides a kind of hoisting crane, comprises front variable amplitude support assembly and principal arm; Described hoisting crane also comprises the anti-tipback cylinder described in above-mentioned any one, and described anti-tipback cylinder one end is connected with described front variable amplitude support assembly, and the other end is connected with described principal arm.
On the basis of existing technology, in the cylinder bar inner chamber of anti-tipback cylinder provided by the present invention, be provided with movably Oil-gas Separation piston, described Oil-gas Separation piston is separated described cylinder bar inner chamber near the first inner chamber of described cylinder bar piston one side and away from the second inner chamber of described cylinder bar piston one side; Described cylinder bar piston is provided with the damping hole that is communicated with described rodless cavity and described the first inner chamber, in described rodless cavity, is filled with hydraulic oil, in described the second inner chamber, is filled with gas.
In the process of tower arm hypsokinesis, hydraulic oil pressurized in rodless cavity, thereby pressurised hydraulic flows to the first inner chamber by the damping hole of being located on cylinder bar piston, now the hydraulic oil in the first inner chamber can promote Oil-gas Separation piston to the second inner chamber one lateral movement, thereby second gas volume in inner chamber reduce, pressure increases, follow Clapyron Equation, and the gaseous tension in the second inner chamber is while equaling the pressure of the hydraulic oil in the first inner chamber, the stop motion of Oil-gas Separation piston, reaches pressure balance; When tower arm continues hypsokinesis, hydraulic oil in rodless cavity is pressurized again, repeat said process, again reach pressure balance, until the hypsokinesis of tower arm is during to end position, now anti-tipback cylinder reaches compression limit position, and cylinder bar is compressed to the cylinder bottom of cylinder barrel, and hydraulic oil in rodless cavity all and then the first inner chamber.Tower arm leans forward in process, and the working process of anti-tipback cylinder is contrary with said process, does not repeat them here.
In above-mentioned working process, on cylinder bar piston, be provided with damping hole, by damping hole, the rodless cavity of anti-tipback cylinder and the first inner chamber are communicated with, thereby the hydraulic oil in rodless cavity can enter in the first inner chamber by damping hole lentamente, and then can realize the smooth change of pressure, and do not produce impact, thereby improved the reliability of work.
In addition, the stroke of above-mentioned anti-tipback cylinder is the same with oil cylinder, can realize range and dead two end positions of journey, thereby can reduce the overall length of anti-tipback cylinder design, and for more wide space has been reserved in the installation of anti-tipback cylinder, easy for installation, it is more reasonable to design.
Moreover, with respect to oil cylinder balance cock compound type anti-squat system of the prior art, anti-tipback cylinder of the present invention is that oil gas is in conjunction with cylinder, and the volume of the hydraulic oil in rodless cavity and the first inner chamber does not change all the time, thereby the oil pipes more than not needing to arrange 80 meters carry out oil-filled or oil return, thereby simple in structure, take up space little, easy for installation, and the problem that reduces of the responding ability of simultaneously also having avoided 80 meters of above oil pipes to cause.
Moreover, with respect to anti-hypsokinesis spring cylinder of the prior art, inflation pressure in the second inner chamber of the anti-tipback cylinder of the present invention can change as required flexibly, thereby in same travel position, its bearing force that can provide can change, thereby before design, do not want accurate Calculation load, avoided anti-hypsokinesis spring cylinder to need the problem of accurate Calculation load.
Finally, anti-tipback cylinder of the present invention is simply to design on the basis of existing oil cylinder, and the course of processing and oil cylinder are basic identical, without special processing, thereby simple in structure, cost is lower.
In sum, anti-tipback cylinder provided by the present invention has higher functional reliability on the one hand, and can realize range and dead two end positions of journey, thereby reduces the overall length of anti-tipback cylinder design; On the other hand simple in structure, take up space little, easy for installation and cost is lower.
In addition, the technique effect of hoisting crane provided by the present invention and the technique effect of above-mentioned anti-tipback cylinder are basic identical, do not repeat them here.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of typical all terrain crane in prior art;
Fig. 2 is the annexation schematic diagram of anti-tipback cylinder and tower arm and principal arm in prior art;
Fig. 3 is the structural representation of a kind of oil cylinder balance cock compound type anti-squat system in prior art;
Fig. 4 is the structural representation of the anti-hypsokinesis spring cylinder of a kind of embedded with spring in prior art;
Fig. 5 is the structural representation of anti-tipback cylinder when extending the limit in an embodiment of the present invention;
Fig. 6 is the structural representation of the anti-tipback cylinder in Fig. 5 while being compressed to intermediateness;
Fig. 7 is the structural representation of the anti-tipback cylinder in Fig. 6 while continuing to be compressed to another intermediateness;
Fig. 8 is the structural representation of the anti-tipback cylinder in Fig. 7 while continuing to be compressed to compression limit;
Fig. 9 is the structural representation of anti-tipback cylinder in the another kind of embodiment of the present invention;
Figure 10 is the principle control block diagram of anti-tipback cylinder in Fig. 9;
Figure 11 is the principle control block diagram after the anti-tipback cylinder in Fig. 9 further improves.
Wherein, in Fig. 1 to Fig. 4, the corresponding relation between component names and Reference numeral is:
Principal arm 1'; Link span 1'1; Anti-tipback cylinder 2'; The large chamber 2'1 of oil cylinder; Oil cylinder loculus 2'2; Tower arm 3'; Tower arm luffing elevator assembly 4'1; Luffing assembly pulley 4'2; Arm-tie assembly 5'1; Front arm-tie assembly 5'2; Front variable amplitude support assembly 6'1; Rear variable amplitude support assembly 6'2.
Corresponding relation in Fig. 5 to Figure 11 between component names and Reference numeral is:
The specific embodiment
Core of the present invention is to provide a kind of anti-tipback cylinder, and this anti-tipback cylinder has higher functional reliability on the one hand, and can realize range and dead two end positions of journey, thereby reduces the overall length of anti-tipback cylinder design; On the other hand simple in structure, take up space little, easy for installation and cost is lower.In addition, another core of the present invention is for providing a kind of hoisting crane that comprises above-mentioned anti-tipback cylinder.
In order to make those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 5, Fig. 6, Fig. 7 and Fig. 8, Fig. 5 is the structural representation of anti-tipback cylinder when extending the limit in an embodiment of the present invention; Fig. 6 is the structural representation of the anti-tipback cylinder in Fig. 5 while being compressed to intermediateness; Fig. 7 is the structural representation of the anti-tipback cylinder in Fig. 6 while continuing to be compressed to another intermediateness; Fig. 8 is the structural representation of the anti-tipback cylinder in Fig. 7 while continuing to be compressed to compression limit.
In one embodiment, anti-tipback cylinder provided by the present invention, for hoisting crane, comprises cylinder barrel 1, cylinder bar 2 and cylinder bar piston 3, and the cavity that cylinder bar piston 3 is separated cylinder barrel 1 is rodless cavity 11 and rod chamber 12, and cylinder bar 2 is provided with cylinder bar inner chamber 21.
On the basis of above-mentioned prior art, as shown in Fig. 5 to Fig. 8, in cylinder bar inner chamber 21, be provided with movably Oil-gas Separation piston 22, this Oil-gas Separation piston 22 is divided into two parts by cylinder bar inner chamber 21, be respectively near the first inner chamber 211 of cylinder bar piston 3 one sides with away from the second inner chamber 212 of cylinder bar piston 3 one sides, and cylinder bar piston 3 is provided with the damping hole 31 that is communicated with rodless cavity 11 and the first inner chamber 211, in rodless cavity 11, be filled with hydraulic oil, in the second inner chamber 212, be filled with gas.
As shown in Figure 5, anti-tipback cylinder is when extending the limit, and the gas volume of the second inner chamber 212 is maximum, is V
1the volume V of 1, the first inner chamber 211
12 is zero (the determined volume of Oil-gas Separation piston 22 depressed part is negligible), and now hydraulic oil all enters in rodless cavity 11, and volume is V
13.
When tower arm starts hypsokinesis, as shown in Figure 6, anti-tipback cylinder is compressed, now, the hydraulic oil in rodless cavity 11 enters in the first inner chamber 211 by damping hole 31, and the hydraulic oil in the first inner chamber 211 can promote Oil-gas Separation piston 22 to the second inner chamber 212 1 lateral movements, the second inner chamber 212 gas volumes reduce, pressure increases, and follows Clapyron Equation, until reach state of equilibrium; Now, the gas volume of the second inner chamber 212 is V
2the volume of the hydraulic oil of 1, the first inner chamber 211 is V
22, the volume of the hydraulic oil in rodless cavity 11 is V
23, because hydraulic oil cumulative volume is constant, thereby V
13=V
22+V
23.
Tower arm continues hypsokinesis, as shown in Figure 7, anti-tipback cylinder is again compressed, the hydraulic oil of rodless cavity 11 continues to enter in the first inner chamber 211 again, Oil-gas Separation piston 22 continues to the second inner chamber 212 1 lateral movements, the second inner chamber 212 gas volumes continue to reduce, and pressure continues to increase, until again reach state of equilibrium; Now, the gas volume of the second inner chamber 212 is V
3the volume of the hydraulic oil of 1, the first inner chamber 211 is V
32, the volume of the hydraulic oil in rodless cavity 11 is V
33, because hydraulic oil cumulative volume is constant, thereby V
13=V
22+V
23=V
32+V
33.
When the hypsokinesis of tower arm is during to end position, as shown in Figure 8, anti-tipback cylinder is compressed in end position, hydraulic oil in rodless cavity 11 all enters in the first inner chamber 211, Oil-gas Separation piston 22 continues to the second inner chamber 212 1 lateral movements again, the second inner chamber 212 gas volumes continue to reduce again, and pressure continues to increase again, until again reach state of equilibrium; Now, the gas volume of the second inner chamber 212 is V
4the volume of the hydraulic oil of 1, the first inner chamber 211 is V
42, the volume of rodless cavity 11 interior hydraulic oil is zero, thereby V
13=V
22+V
23=V
32+V
33=V
42.
Below will introduce technique effect of the present invention:
In above-mentioned working process, on cylinder bar piston 3, be provided with damping hole 31, by damping hole 31, the rodless cavity of anti-tipback cylinder 11 and the first inner chamber 211 are communicated with, thereby the hydraulic oil in rodless cavity 11 can enter in the first inner chamber 211 by damping hole 31 lentamente, and then can realize the smooth change of pressure, and do not produce impact, thereby improved the reliability of work.
In addition, the stroke of above-mentioned anti-tipback cylinder is the same with oil cylinder, can realize range and dead two end positions of journey, thereby can reduce the overall length of anti-tipback cylinder design, and for more wide space has been reserved in the installation of anti-tipback cylinder, easy for installation, it is more reasonable to design.
Moreover, with respect to oil cylinder balance cock compound type anti-squat system of the prior art, anti-tipback cylinder of the present invention is that oil gas is in conjunction with cylinder, and the volume of the hydraulic oil in rodless cavity 11 and the first inner chamber 211 does not change all the time, thereby the oil pipes more than not needing to arrange 80 meters carry out oil-filled or oil return operation, thereby simple in structure, take up space little, easy for installation, and the problem that reduces of the responding ability of simultaneously also having avoided 80 meters of above oil pipes to cause.
Moreover, with respect to anti-hypsokinesis spring cylinder of the prior art, inflation pressure in the second inner chamber 212 of the anti-tipback cylinder of the present invention can change as required flexibly, thereby in same travel position, its support reaction that can provide can change, thereby before design, do not want accurate Calculation load, avoided anti-hypsokinesis spring cylinder to need the problem of accurate Calculation load.
Finally, anti-tipback cylinder of the present invention is simply to design on the basis of existing oil cylinder, and the course of processing and oil cylinder are basic identical, without special processing, thereby simple in structure, cost is lower.
In sum, anti-tipback cylinder provided by the present invention has higher functional reliability on the one hand, and can realize range and dead two end positions of journey, thereby reduces the overall length of anti-tipback cylinder design; On the other hand simple in structure, take up space little, easy for installation and cost is lower.
It should be noted that, in anti-tipback cylinder of the present invention, can in cylinder bar inner chamber 21, Oil-gas Separation piston 22 be set, aerification all in cylinder bar inner chamber 21 and rodless cavity 11; On this basis, anti-tipback cylinder is compressed, and the gas in rodless cavity 11 enters in cylinder bar inner chamber 21 by damping hole 31, and volume of gas reduces, and pressure increases, and follows Clapyron Equation, obviously also can provide the anti-hypsokinesis of tower arm needed support reaction.In case tipback cylinder is example when extending the limit, anti-tipback cylinder and the present invention of this kind of structure design arranges the anti-tipback cylinder of Oil-gas Separation piston 22 and compares, the volume of the former gas is the volume sum of cylinder bar inner chamber 21 and rodless cavity 11, the volume of the latter's gas is the volume of cylinder bar inner chamber 21, the former gas volume is greater than the latter's gas volume, according to Clapyron Equation P
1v
1=P
2v
2known, the former and the latter's gas volume is a compressed unit volume V all, the latter's gaseous tension increase value is greater than the pressure increase value of the former gas, thereby the anti-tipback cylinder that the present invention arranges Oil-gas Separation piston 22 can provide the larger anti-hypsokinesis support reaction of tower arm.
In addition, also it should be noted that, the area that Oil-gas Separation piston 22 can be set is S
1, the sectional area of rodless cavity 11 is S
2, in the second inner chamber 212, gaseous tension is P
1, the pressure of the hydraulic oil in rodless cavity 11 and the first inner chamber 211 is P
2, while reaching state of equilibrium, P
1=P
2; On this basis, the support reaction that anti-tipback cylinder provides is P
2s
2, by the structure to anti-tipback cylinder, design, such as reducing the sectional area of cylinder bar inner chamber 21, that is reduce the volume of gas in the second inner chamber 211, known according to the analysis of the preceding paragraph, this kind of design can increase the support reaction that anti-tipback cylinder provides as required; Or also can increase the support reaction that anti-tipback cylinder provides by increasing the mode of rodless cavity 11 sectional areas.
Please refer to Fig. 9, Fig. 9 is the structural representation of anti-tipback cylinder in the another kind of embodiment of the present invention.
In the above-described embodiments, can also make further improvement, thereby obtain another kind of embodiment of the present invention.Such as, cylinder barrel 1 is provided with cylinder bottom 13, and cylinder bottom 13 is provided with the oil-filled hole 131 being communicated with rodless cavity 11, and oil-filled hole 131 is connected with fuel delivery device.When the volume of the hydraulic oil in the airtight cavity that rodless cavity 11, damping hole 31 and cylinder bar inner chamber 21 form is less, can be interior oil-filled to described rodless cavity 11 by described fuel delivery device, alerting ability is higher, once thereby avoid anti-hypsokinesis spring cylinder spring in prior art to destroy the problem of just scrapping.
Further, cylinder bottom 13 is also provided with surveys oil pressure hole 132, surveys oil pressure hole 132 and is connected with oil pressure detecting device.Described oil pressure detecting device can detect the pressure of hydraulic oil at any time, thereby makes operating personal can grasp at any time pressure changing, when the pressure of hydraulic oil changes, occurs when abnormal, can taking corresponding safety measure.Described oil pressure detecting device is specifically as follows pressure sensor, can also be the pressure detecting part of other types certainly.
Further, as shown in Figure 9, cylinder bar 2 is provided with bar head 23, and bar head 23 is provided with the air-filled pore 231 being communicated with the second inner chamber 212, and air-filled pore 231 is connected with air delivery device.When gas in the second inner chamber 212 is less, can be by described air delivery device to the interior inflation of the second inner chamber 212, alerting ability is higher; And can root as required, in the second inner chamber 212, be filled with more gas, the anti-hypsokinesis support reaction that can provide to increase anti-tipback cylinder.
Further, as shown in Figure 9, bar head 23 is also provided with surveys pressure hole 232, surveys pressure hole 232 and is connected with pressure test device.Described pressure test device can detect the pressure in the second inner chamber 212 at any time, thereby makes operating personal can grasp at any time pressure changing, when pressure variation appearance is abnormal, can take corresponding safety measure.Such as, described pressure test device can be provided with warning device, and when the pressure of the second inner chamber 212 detecting when described pressure test device is less than predetermined value, described warning device sends alerting signal.And further, described warning device is connected with the control setup of hoisting crane, so that described control setup sends the instruction of deceleration or braking to the tower arm elevator 6 of described hoisting crane according to described alerting signal.
When the pressure in the second inner chamber 212 is less than predetermined value, warning device sends alerting signal, and this signal is transferred to described control setup, the automatic control tower arm of described control setup elevator 6 brake snub, and this mode has higher intelligent level.In addition, control setup also further can be connected with described air delivery device, and described control setup, when receiving described alerting signal, is controlled described air delivery device to the second inner chamber 212 gas transmissions, this mode has higher intelligent level equally, and has further improved safety.
Please refer to Figure 10 and Figure 11, Figure 10 is the principle control block diagram of anti-tipback cylinder in Fig. 9; Principle control block diagram after anti-tipback cylinder in Figure 11 Fig. 9 further improves.
In above-mentioned any embodiment of the present invention, can also make further improvement.Such as, please refer to Figure 10, described anti-tipback cylinder can also comprise position detecting element 4, the position for detection of cylinder bar 2 in retraction process, and send signal; At this, it should be noted that, the detecting element of any type, as long as can detect the position of cylinder bar 2 in retraction process and send signal, all within the protection domain of the present embodiment.
Described anti-tipback cylinder also comprises control element 5, the signal sending for receiving position detecting element 4, and send instruction according to this signal.At this, it is pointed out that control element 5 and control setup mentioned above can be same controller.
When cylinder bar 2 bounces back to the primary importance that approaches its end of run, position detecting element 4 sends first signal, and control element 5 slows down according to described first signal control tower arm elevator 6, and then the hypsokinesis of control tower arm is slowed down.
When cylinder bar 2 further bounces back to the second place that approaches its end of run, position detecting element 4 sends secondary signal, and control element 5 is according to described secondary signal control tower arm elevator 6 brakings, and then control tower arm hypsokinesis braking.
The anti-tipback cylinder that the present embodiment provides has been realized steady deceleration and the safety arrestment of the hypsokinesis of tower arm, thereby makes the work of tower arm more safe and reliable.
Please refer to Figure 10, in the above-described embodiments, we can make concrete setting to position detecting element 4, particularly, position detecting element 4 comprises the first detector switch 41, the second detector switch 42 and detects piece 43, the first detector switch 41 and the second detector switch 42 are installed on cylinder barrel 1, detect piece 43 and are installed on cylinder bar 2.
When the first detector switch 41 detects detection piece 43, the first detector switch 41 sends described first signal, and control element 5 slows down according to described first signal control tower arm elevator 6, and then the hypsokinesis of control tower arm is slowed down.After the schedule time, when the second detector switch 42 detects detection piece 43, the second detector switch 42 sends described secondary signal, and control element 5 is according to described secondary signal control tower arm elevator 6 brakings, and then control tower arm hypsokinesis braking.
Certainly, position detecting element 4 can also consist of a detector switch and two detection pieces, by suitable structure design, when cylinder bar 2 arrives described primary importance, detector switch detects first and detects piece, thereby send first signal, control element 5 is controlled described tower arm elevator 6 according to described first signal and is slowed down; When cylinder bar 2 arrives the described second place, detector switch detects second and detects piece, thereby sends secondary signal, and control element 5 is according to described secondary signal control tower arm elevator 6 brakings.Obviously, this structure design also can be realized goal of the invention, technical solution problem.
Please refer to Fig. 9, in the above-described embodiments, we can make further setting to the installation site of the first detector switch 41 and the second detector switch 42.Particularly, the end of cylinder barrel 1 is provided with mounting bracket, and described mounting bracket comprises the extension 7 that stretches out cylinder barrel 1 end; The first detector switch 41 is installed on the outer end of extension 7, and the second detector switch 42 is installed on the inner of extension 7.This setup is simple in structure, and cost is lower.
In addition, the present invention also provides a kind of hoisting crane, comprises front variable amplitude support assembly and principal arm; Described hoisting crane is the anti-tipback cylinder described in above-mentioned any embodiment also, and described anti-tipback cylinder one end is connected with described front variable amplitude support assembly, and the other end is connected with described principal arm; Other parts of described hoisting crane can, with reference to prior art, no longer be launched herein.
Finally, above hoisting crane provided by the present invention and anti-tipback cylinder thereof are described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (6)
1. an anti-tipback cylinder, for hoisting crane, comprise cylinder barrel (1), cylinder bar (2) and cylinder bar piston (3), the cavity that described cylinder bar piston (3) is separated described cylinder barrel (1) is rodless cavity (11) and rod chamber (12), and described cylinder bar (2) is provided with cylinder bar inner chamber (21); It is characterized in that, in described cylinder bar inner chamber (21), be provided with movably Oil-gas Separation piston (22), described Oil-gas Separation piston (22) is separated described cylinder bar inner chamber (21) near first inner chamber (211) of described cylinder bar piston (3) one sides and away from second inner chamber (212) of described cylinder bar piston (3) one sides; Described cylinder bar piston (3) is provided with the damping hole (31) that is communicated with described rodless cavity (11) and described the first inner chamber (211), and described rodless cavity is filled with hydraulic oil in (11), in described the second inner chamber (212), is filled with gas;
Described cylinder barrel (1) is provided with cylinder bottom (13), and described cylinder bottom (13) is provided with the oil-filled hole (131) being communicated with described rodless cavity (11), and described oil-filled hole (131) is connected with fuel delivery device;
Described cylinder bar (2) is provided with bar head (23), and described bar head (23) is provided with the air-filled pore (231) being communicated with described the second inner chamber (212), and described air-filled pore (231) is connected with air delivery device;
Described bar head (23) is also provided with surveys pressure hole (232), and described survey pressure hole (232) is connected with pressure test device;
Described pressure test device is provided with warning device; When the pressure of described the second inner chamber (212) detecting when described pressure test device is less than predetermined value, described warning device sends alerting signal;
The tower arm elevator (6) that described hoisting crane is provided with control setup and is connected with described control setup, described warning device is connected with control setup, so that described control setup sends the instruction of slowing down or braking to described tower arm elevator (6) according to described alerting signal.
2. anti-tipback cylinder as claimed in claim 1, is characterized in that, described cylinder bottom (13) is also provided with surveys oil pressure hole (132), and described survey oil pressure hole (132) is connected with oil pressure detecting device.
3. anti-tipback cylinder as claimed in claim 1 or 2, is characterized in that, also comprises:
Position detecting element (4), the position for detection of described cylinder bar (2) in retraction process, and send signal;
Control element (5), the signal sending for receiving described position detecting element (4), and send instruction according to this signal;
When described cylinder bar (2) bounces back to the primary importance that approaches its end of run, described position detecting element (4) sends first signal, and the tower arm elevator (6) that described control element (5) is controlled described hoisting crane according to described first signal slows down;
When described cylinder bar (2) further bounces back to the second place that approaches its end of run, described position detecting element (4) sends secondary signal, and described control element (5) is controlled tower arm elevator (6) braking of described hoisting crane according to described secondary signal.
4. anti-tipback cylinder as claimed in claim 3, it is characterized in that, described position detecting element (4) comprises the first detector switch (41), the second detector switch (42) and detects piece (43), described the first detector switch (41) and described the second detector switch (42) are installed on described cylinder barrel (1), and described detection piece (43) is installed on described cylinder bar (2);
When described the first detector switch (41) detects described detection piece (43), described the first detector switch (41) sends described first signal;
After the schedule time, when described the second detector switch (42) detects described detection piece (43), described the second detector switch (42) sends described secondary signal.
5. anti-tipback cylinder as claimed in claim 4, is characterized in that, the end of described cylinder barrel (1) is provided with mounting bracket, and described mounting bracket comprises the extension (7) that stretches out described cylinder barrel (1) end; Described the first detector switch (41) is installed on the outer end of described extension (7), and described the second detector switch (42) is installed on the inner of described extension (7).
6. a hoisting crane, comprises front variable amplitude support assembly and principal arm; It is characterized in that, described hoisting crane also comprises the anti-tipback cylinder as described in claim 1 to 5 any one, and described anti-tipback cylinder one end is connected with described front variable amplitude support assembly, and the other end is connected with described principal arm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010292707.6A CN102408073B (en) | 2010-09-25 | 2010-09-25 | Crane and anti-tipback cylinder thereof |
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| CN201010292707.6A CN102408073B (en) | 2010-09-25 | 2010-09-25 | Crane and anti-tipback cylinder thereof |
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| CN102408073B true CN102408073B (en) | 2014-04-09 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI124684B (en) * | 2012-12-03 | 2014-12-15 | Ponsse Oyj | Crane |
| CN103552943B (en) * | 2013-11-11 | 2016-02-10 | 湖南中铁五新重工有限公司 | Fall and the safety device of hypsokinesis for preventing high pedestal jib crane jib |
| CN104832584B (en) * | 2014-05-22 | 2017-04-05 | 北汽福田汽车股份有限公司 | Anti- hypsokinesis shock mitigation system and dynamic compaction machinery |
| CN110589696B (en) * | 2019-09-19 | 2021-03-02 | 青岛海西重机有限责任公司 | Steel wire rope luffing jib loading boom anti-falling device and crane |
| CN112723203B (en) * | 2020-12-28 | 2022-08-05 | 中联重科股份有限公司 | Control method and device for anti-back-tilting oil cylinder of arm support and engineering machinery |
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| CN102408073A (en) | 2012-04-11 |
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