CN103132501A - Dynamic compaction machine - Google Patents
Dynamic compaction machine Download PDFInfo
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- CN103132501A CN103132501A CN2013100763785A CN201310076378A CN103132501A CN 103132501 A CN103132501 A CN 103132501A CN 2013100763785 A CN2013100763785 A CN 2013100763785A CN 201310076378 A CN201310076378 A CN 201310076378A CN 103132501 A CN103132501 A CN 103132501A
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Abstract
The invention provides a dynamic compaction machine. The dynamic compaction machine comprises a cantilever crane (10) and craning ropes (50), wherein the craning ropes (50) comprise a first segment rope body (51) and a second segment rope body (52), wherein the first segment rope body (51) and a second segment rope body (52) are mutually connected and are respectively located on opposite sides of the cantilever crane (10). The first segment rope body (51) is provided with a hoisting mechanism connecting end. The second segment rope body (52) is provided with a compaction hammer connecting end. A first line of the first segment rope body (51), a second line of the second segment rope body (52) and a lengthways center line of the cantilever crane (10) are intersected at one point. A first included angle between the first line and the lengthways center line is fitted with a second included angle between the second line and the lengthways center line. The dynamic compaction machine can reduce the vibration of the cantilever crane when a compaction hammer drops. Stability of the whole machine is kept. Service life of components is prolonged and operation environment is improved.
Description
Technical field
The present invention relates to technical field of engineering machinery, in particular to a kind of dynamic compaction machinery.
Background technology
As shown in Figure 1, dynamic compaction machinery is a kind of engineering machinery for compacting foundation, and its effect is after rising to certain height by the hammer ram 20 ' that lifting rope 50 ' will be demarcated weight repeatedly, hammer ram 20 ' to be fallen, form powerful impact in soil, reach the purpose that improves foundation capability.
The crawler type dynamic compaction machinery of generally using at present is that development forms on the basis of crawler crane, adopts jib lubbing mechanism 30 ' to connect jib 10 ', and jib lubbing mechanism 30 ' comprises variable-amplitude steel wire rope 31 ' and arm-tie 32 '.When promoting hammer ram 20 ', make jib 10 ' reach equalising torque by the jib lubbing mechanism 30 ' application of force; Before hammer ram 20 ' fell, jib lubbing mechanism 30 ' deformation energy, jib 10 ' were also because of eccentric bearing strain energy storage.When hammer ram 20 ' falls moment, above-mentioned energy sudden outburst causes jib 10 ' bounce-back, the equalising torque state is destroyed, turn over after making jib 10 ' unlikely, the inclination-proof device 40 ' that arranges in the middle of jib 10 ' with pooling feature stops and the 10 ' vibration of decay jib, finally reaches inactive state; Inclination-proof device 40 ' is generally the first sway bar 41 ' that a cover is positioned at the below, in order further to reduce vibration, even can increase the second sway bar 42 ' that a cover is positioned at the top.Because rebounce power is larger, although the first sway bar 41 ' and the second sway bar 42 ' are provided with respectively spring, but play certain cushioning effect, but can form suitable impact to turntable, aggravate rocking of complete machine.The groundwork characteristics high due to working level, that frequent Condition of Sudden Unloading is dynamic compaction machinery, for a long time frequently under percussion, fatigue failure easily occurs in structural member, and the reliability of element also will significantly reduce, impact frequently simultaneously and rock, cause operator's working environment and the non-constant of safety.
Summary of the invention
The present invention aims to provide a kind of dynamic compaction machinery, the vibration of arm in the time of can reducing the hammer ram whereabouts.
To achieve these goals, according to an aspect of the present invention, provide a kind of dynamic compaction machinery, having comprised: jib; And lifting rope, comprising the first paragraph rope body and the second segment rope body that interconnect and lay respectively at two opposite sides of jib, first paragraph rope body has the lifting mechanism link, and second segment rope body has the hammer ram link; Second straight line at first straight line at first paragraph rope body place, second segment rope body place and the longitudinal centre line of jib intersect at a point, and the second angle between the longitudinal centre line of the first angle between the longitudinal centre line of the first straight line and jib and the second straight line and jib adapts.
Further, the angle that the first straight line and the second straight line form has angular bisector, and jib arranges rotationally, and the center line of the slewing area of jib overlaps with angular bisector.
Further, dynamic compaction machinery also comprises: turntable; And lifting mechanism, being arranged on turntable, lifting mechanism is connected with the lifting mechanism link of first paragraph rope body.
Further, lifting mechanism comprises: the lifting rope adjusting part is arranged on turntable and with the lifting mechanism link of first paragraph rope body and is connected, with the action of the hammer ram link of regulating second segment rope body; And first support portion, first end is connected with turntable, and the second end is connected with the lifting rope adjusting part, encloses the formation triangular structure between the first support portion, lifting rope adjusting part and turntable.
Further, the lifting rope adjusting part comprises: installing rack, and hinged with turntable and the first support portion respectively, enclose the formation triangular structure between installing rack, turntable and the first support portion; The fixed pulley group is arranged on installing rack; And running block, be arranged on installing rack and be positioned at the below of fixed pulley group, running block has to away from first duty of fixed pulley prescription to motion, and near second duty of fixed pulley prescription to motion; Lifting mechanism link pile warp fixed pulley group and the running block of first paragraph rope body.
Further, the lifting rope adjusting part also comprises regulating part, be arranged on to the regulating part adjustable in length on installing rack and with the lifting mechanism link of first paragraph rope body and be connected, regulating part has contraction in length and is connected with running block so that running block is positioned at the 3rd duty of the first duty, and is separated with running block so that running block is positioned at the 4th duty of the second duty.
Further, installing rack has the bending segment of the section of being located thereon, and the cross section of bending segment reduces gradually along the direction away from turntable; The fixed pulley group has two, and two fixed pulley groups are arranged at respectively on the bending segment of installing rack, and arrange in turn along the overbending direction of bending segment.
Further, jib and turntable are hinged; Dynamic compaction machinery also comprises the jib lubbing mechanism of adjustable in length ground setting, and first end and the jib of jib lubbing mechanism are hinged, and the second end of jib lubbing mechanism is fixedly installed with respect to turntable.
Further, any one in the second end of jib lubbing mechanism and the first support portion, lifting rope adjusting part or turntable is hinged.
Further, dynamic compaction machinery also comprises the second support portion that adjustable in length ground arranges, and the second support portion is fixedly connected with the side of turntable away from jib, and the edge away from the direction of turntable to downward-extension.
Use technical scheme of the present invention, by two opposite sides that make the first paragraph rope body that is connected on lifting rope and second segment rope body lay respectively at jib, first paragraph rope body is connected with lifting mechanism, second segment rope body is connected with hammer ram, and first paragraph rope body place the first straight line, second segment rope body place the second straight line and jib longitudinal centre line three lines intersect at a point, only one-way shaft is to pressure-bearing for jib at this moment, and namely substantially without moment of flexure, jib structure is without flexural deformation to jib for external applied load.Because the angle between the angle between the first straight line and jib longitudinal centre line, the second straight line and jib longitudinal centre line adapts, namely substantially equal, so jib both sides wire rope power is identical, therefore, when promoting hammer ram, external applied load is to jib hinge equalising torque.When dropping hammer moment, arm head both sides wire rope power disappears simultaneously, and jib will be kept above-mentioned equilibrium state.
Description of drawings
The Figure of description that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram according to the dynamic compaction machinery of prior art;
Fig. 2 shows the schematic diagram of the dynamic compaction machinery of first embodiment according to the invention;
Fig. 3 shows the C place enlarged drawing according to the dynamic compaction machinery of first embodiment of Fig. 2;
Fig. 4 shows the schematic diagram of lifting rope adjusting part of the dynamic compaction machinery of first embodiment according to the invention;
Fig. 5 shows the schematic diagram of jib three operating positions of the dynamic compaction machinery of first embodiment according to the invention;
Fig. 6 shows the schematic diagram according to the dynamic compaction machinery of second embodiment of the present invention;
Fig. 7 shows the schematic diagram according to the dynamic compaction machinery of the 3rd embodiment of the present invention; And
Fig. 8 shows the schematic diagram according to the dynamic compaction machinery of the 4th embodiment of the present invention.
The specific embodiment
Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.
To shown in Figure 5, first embodiment according to the invention provides a kind of dynamic compaction machinery, comprises crawler body 90, turntable 80, jib 10, hammer ram 20, lifting rope 50, jib lubbing mechanism 30 and lifting mechanism 70 as Fig. 2.Its intermediate station 80 is arranged on crawler body 90 rotationally, and jib 10 and lifting mechanism 70 are arranged on turntable 80 servo-actuatedly, and jib 10 is articulated in the G point with turntable 80.The lifting mechanism link of the first end of lifting rope 50 for being connected with lifting mechanism 70, the second end is the hammer ram link that is connected with hammer ram 20 after the fixed pulley at pile warp jib 10 tops, wherein the part between the lifting mechanism link of lifting rope 50 and jib 10 tops is first paragraph rope body 51, part between the hammer ram link of lifting rope 50 and jib 10 tops is second segment rope body 52, and first paragraph rope body 51 and second segment rope body 52 lay respectively at two opposite sides of jib 10.
In conjunction with referring to Fig. 5, second straight line at first straight line at first paragraph rope body 51 places, second segment rope body 52 places and the longitudinal centre line of jib 10 intersect at a point, and the second angle between the longitudinal centre line of the first angle between the longitudinal centre line of the first straight line and jib 10 and the second straight line and jib 10 adapts, and is namely substantially equal.That is to say, the angle that the first straight line and the second straight line form has angular bisector, and jib 10 arranges rotationally, and the center line of the slewing area of jib overlaps with this angular bisector.
In the present invention, the quantity of jib 10 both sides lifting ropes 50 equates, namely is equivalent to single multiplying power operation.Suppose ground level and ignore jib 10 deadweights, in dynamic compaction machinery working range as shown in Figure 5, be in 70 ° to 80 ° scopes of jib 10 rotations, second straight line at first straight line at first paragraph rope body 51 places, second segment rope body 52 places and longitudinal centre line three lines of jib 10 intersect at a bit substantially, namely when jib 10 anglecs of rotation were 80 °, this intersection point was X
1, the angle between the longitudinal centre line of the first straight line and jib 10 is α at this moment
1, the angle between the longitudinal centre line of the second straight line and jib 10 is β
1When jib 10 anglecs of rotation were 75 °, this intersection point was X
2, the angle between the longitudinal centre line of the first straight line and jib 10 is α at this moment
2, the angle between the longitudinal centre line of the second straight line and jib 10 is β
2When jib 10 anglecs of rotation were 70 °, this intersection point was X
3, the angle between the longitudinal centre line of the first straight line and jib 10 is α at this moment
3, the angle between the longitudinal centre line of the second straight line and jib 10 is β
3, no matter being in which angle, all only one-way shaft is to pressure-bearing for jib 10, and namely substantially without moment of flexure, jib structure is without flexural deformation to jib 10 for external applied load.In Fig. 5, P is lifting rope 50 and the point of contact of the fixed pulley group 714 at the top of lifting mechanism 70.
Because the second angle between the longitudinal centre line of the first angle between the longitudinal centre line of the first straight line and jib 10 and the second straight line and jib 10 equates substantially, i.e. α
1≈ β
1, α
2≈ β
2, α
3≈ β
3, make the first paragraph rope body 51 of jib 10 both sides identical with the power of second segment rope body 52, therefore, when promoting hammer ram 20, the equalising torque of external applied load to the hinge G of jib 10.When hammer ram 20 falls moment, the first paragraph rope body 51 of jib 10 both sides disappears simultaneously with the power of second segment rope body 52, and jib 10 will be kept above-mentioned equilibrium state.
Here the first angle equates it is a kind of perfect condition of optimum with the second angle, generally in practical operation, due to the impact of various external conditions, can not reach desirable identical state, as long as but be tending towards equal, just can substantially realize the purpose of above-mentioned balance jib 10.
And in fact, the deadweight of ground inclination degree and jib 10 be can not ignore, at this moment, the deviation of the moment of the dead-load moment of jib 10 and the jib 10 both sides first paragraph rope bodies 51 that cause because of the ground injustice and second segment rope body 52 is by the power of jib lubbing mechanism 30 balance with it.The power of this jib lubbing mechanism 30 may be that pressure may be also pulling force.Because the ground inclination degree can not be very large, substantially less than 5%, and jib 10 deadweights are less, so the power of jib lubbing mechanism 30 also can be little, fully in the tolerance range of jib structure.Substitute existing variable-amplitude steel wire rope and luffing arm-tie by jib lubbing mechanism 30, make the overall structure of dynamic compaction machinery simpler, control convenient.
In conjunction with referring to Fig. 2, in the present invention, jib lubbing mechanism 30 is amplitude oil cylinder, its first end and jib 10 are hinged, the second end and lifting mechanism 70 are hinged, the telescopic drive jib 10 of the piston rod by amplitude oil cylinder rotates around hinge G, makes the angle of inclination of jib 10 reduce or increase, and realizes the balance of jib 10.Certainly, the jib lubbing mechanism 30 here is not limited to amplitude oil cylinder, so long as the structure of adjustable in length, moment that can balance jib 10 gets final product, as one group of telescope, in the time of in the body of internal layer is retracted outer field body, the sleeve pipe entire length is dwindled, when the body of internal layer stretched out outer field body, the sleeve pipe entire length increased, and can play the effect identical with amplitude oil cylinder equally.
in conjunction with referring to Fig. 4, lifting rope adjusting part 71 comprises installing rack 711, fixed pulley group 714 and running block 713, wherein installing rack 711 is for being articulated in the trussed construction on turntable 80, installing rack 711 inside have the installing space for the miscellaneous part that lifting rope adjusting part 71 is installed, fixed pulley group 714 and running block 713 are separately positioned on installing rack 711, and running block 713 is positioned at the below of fixed pulley group 714, running block 713 arranges movingly along the slideway of the installing space inside that is arranged at installing rack 711, it has to the first duty away from the 714 direction motions of fixed pulley group, and to the second duty that arranges near fixed pulley group 714 directions, the lifting mechanism link of lifting rope 50 is pile warp running block 713 and fixed pulley group 714 respectively.
in the present invention, the motion of running block 713 drives by regulating part 712, regulating part 712 is arranged in the installing space of installing rack 711, it is positioned at the below of running block 713 and is connected with the lifting mechanism link of first paragraph rope body 51, the length of regulating part 712 can be adjusted, when the contraction in length of regulating part 712, regulating part 712 is connected with running block 713, and move downward along slideway with running block 713, make running block 713 be positioned at the first duty, driving simultaneously the hammer ram 20 that the hammer ram link of second segment rope body 52 connects rises, at this moment regulating part 712 is positioned at the 3rd duty, after hammer ram 20 arrives predetermined altitude, the under reach of regulating part 712 stops, then regulating part 712 is separated with running block 713, running block 713 is moved to the direction near fixed pulley group 714 along slideway, fixed pulley group 714 enters the second duty, hammer ram 20 falls, and at this moment regulating part 712 is positioned at the 4th duty.Length adjustment by regulating part 712 self and being connected with running block 713 selective can realize hoisting of hammer ram 20 that lifting rope 50 connects.
Preferably, regulating part 712 is the adjusting oil cylinder, but the regulating part 712 here is not limited to regulate oil cylinder, also can replace with the structure of other adjustable in length, as the aforementioned sleeve pipe.
The top of installing rack 711 has bending segment, the cross section of this bending segment subtracts gradually along the direction away from turntable 80, a top that is arranged on rotationally bending segment in two fixed pulley groups 714, another bottom near bending segment arranges, and two fixed pulley group 714 integral body are arranged in turn along the overbending direction of bending segment.
Certainly, the fixed pulley group 714 here is not limited to two, and the quantity that it is concrete and position should arrange according to actual needs, and the fixed pulley group 714 of varying number for example is set according to the required multiplying power that hoists.
In conjunction with referring to Fig. 3, due to hammer ram 20 front and back, whereabouts, machine gravity existence sudden change, therefore, when 20 times backwardnesss of hammer ram, the ground elastic deformation is recovered, and complete machine has the trend of layback.By being fixedly connected with one along alleviating this trend away from the direction of turntable 80 to the second support portion 60 of downward-extension at turntable 80 away from a side of jib 10, the second support portion 60 is fixed on turntable 80 by junction plate 61.In the present invention, the second support portion 60 is support oil cylinder, but the structure of the second support portion 60 is not limited to support oil cylinder, also can replace with the structure of other adjustable in length, also can realize this purpose.
As shown in the above, dynamic compaction machinery of the present invention is in operation process, can realize the self-balancing of jib 10, namely before and after hammer ram 20 falls, jib 10 is substantially without bounce-back trend, and rocking also of complete machine will significantly be cut down, and the reliability of structural life-time and components and parts therefore and significantly improves, and operator's working environment and safety also are improved.Simultaneously, dynamic compaction machinery structure composition of the present invention and installation are controlled comparatively simple, and lifting mechanism 70, turntable 80 and the first support portion 72 are relatively fixing, and in the working range of jib 10, the variation of its operation amplitude can not affect the self-balancing of jib 10.In addition, as the balance weight type crane gear, the counterweight vitals that is absolutely necessary.Dynamic compaction machinery of the present invention utilizes the weight of lifting mechanism 70 to replace the part counterweight, and itself is as hoisting mechanism, and cost also carries free off the hook elevator lower than the same level band.
In conjunction with referring to Fig. 6, according to second embodiment of the present invention, a kind of dynamic compaction machinery is provided, itself and first example structure is basic identical, difference is, in the present embodiment, the second end and the lifting rope adjusting part 71 of jib lubbing mechanism 30 are hinged, this connected mode can with first embodiment in jib lubbing mechanism 30 serve the same role.
In conjunction with referring to Fig. 7, according to the 3rd embodiment of the present invention, a kind of dynamic compaction machinery is provided, itself and first example structure is basic identical, difference is, in the present embodiment, the second end and the turntable 80 of jib lubbing mechanism 30 are hinged, this connected mode can with first embodiment in jib lubbing mechanism 30 serve the same role.
Can be found out by three above-mentioned embodiment, the mounting means of jib lubbing mechanism 30 is versatile and flexible, can connect arbitrarily according to actual conditions, as long as its second end is fixing with respect to turntable 80, gets final product with the basis that provides support.
in conjunction with referring to Fig. 8, according to the 4th embodiment of the present invention, a kind of dynamic compaction machinery is provided, itself and first example structure is basic identical, difference is, when improving the tamping energy operation, increase auxiliary mast 40 and hoist engine 53, at this moment, luffing rope 31 is connected between the top and lifting mechanism 70 of jib 10, be used for realizing the function that plays arm and luffing of jib 10, under this structure, jib lubbing mechanism 30 can be set, hoist engine 53 is arranged on turntable 80, the first end of lifting rope 50 is connected with hoist engine 53, lifting mechanism 70 is no longer born the regulatory function of lifting rope 50, and substituted by hoist engine 53.The dynamic compaction machinery of this structure, because the annexation of lifting rope 50 changes, the longitudinal centre line of the described lifting rope 50 that needs jib 10 both sides of first embodiment and jib 10 does not meet at a bit for another example, but due to auxiliary mast 40 being arranged, jib 10 still can be realized balance, reduces vibration.
from above description, can find out, the above embodiments of the present invention have realized following technique effect: use technical scheme of the present invention, by two opposite sides that make the first paragraph rope body that is connected on lifting rope and second segment rope body lay respectively at jib, first paragraph rope body is connected with lifting mechanism, second segment rope body is connected with hammer ram, and first paragraph rope body place the first straight line, second segment rope body place the second straight line and jib longitudinal centre line three lines intersect at a point, this moment jib only one-way shaft to pressure-bearing, be external applied load to jib substantially without moment of flexure, jib structure is without flexural deformation.Because the angle between the angle between the first straight line and jib longitudinal centre line, the second straight line and jib longitudinal centre line adapts, namely substantially equal, so jib both sides wire rope power is identical, therefore, when promoting hammer ram, external applied load is to jib hinge equalising torque.When dropping hammer moment, arm head both sides wire rope power disappears simultaneously, and jib will be kept above-mentioned equilibrium state.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. dynamic compaction machinery comprises:
Jib (10); And
Lifting rope (50), comprise the first paragraph rope body (51) and the second segment rope body (52) that interconnect and lay respectively at (10) two opposite sides of described jib, described first paragraph rope body (51) has the lifting mechanism link, and described second segment rope body (52) has the hammer ram link;
It is characterized in that, second straight line at first straight line at described first paragraph rope body (51) place, described second segment rope body (52) place and the longitudinal centre line of described jib (10) intersect at a point, and the second angle between the longitudinal centre line of the first angle between the longitudinal centre line of described the first straight line and described jib (10) and described the second straight line and described jib (10) adapts.
2. dynamic compaction machinery according to claim 1, it is characterized in that, the angle that described the first straight line and described the second straight line form has angular bisector, and described jib (10) arranges rotationally, and the center line of the slewing area of described jib (10) overlaps with described angular bisector.
3. dynamic compaction machinery according to claim 1 and 2, is characterized in that, described dynamic compaction machinery also comprises:
Turntable (80); And
Lifting mechanism (70) is arranged on described turntable (80), and described lifting mechanism (70) is connected with the described lifting mechanism link of described first paragraph rope body (51).
4. dynamic compaction machinery according to claim 3, is characterized in that, described lifting mechanism (70) comprising:
Lifting rope adjusting part (71) is arranged at described turntable (80) upper and be connected with the described lifting mechanism link of described first paragraph rope body (51), with the action of the described hammer ram link of regulating described second segment rope body (52); And
The first support portion (72), first end is connected with described turntable (80), the second end is connected with described lifting rope adjusting part (71), encloses the formation triangular structure between described the first support portion (72), described lifting rope adjusting part (71) and described turntable (80).
5. dynamic compaction machinery according to claim 4, is characterized in that, described lifting rope adjusting part (71) comprising:
Installing rack (711), hinged with described turntable (80) and described the first support portion (72) respectively, enclose between described installing rack (711), described turntable (80) and described the first support portion (72) and form described triangular structure;
Fixed pulley group (714) is arranged on described installing rack (711); And
Running block (713), be arranged at described installing rack (711) and go up and be positioned at the below of described fixed pulley group (714), described running block (713) has to the first duty away from the motion of described fixed pulley group (714) direction, and to the second duty near the motion of described fixed pulley group (714) direction;
The described described fixed pulley group of lifting mechanism link pile warp (714) of described first paragraph rope body (51) and described running block (713).
6. dynamic compaction machinery according to claim 5, it is characterized in that, described lifting rope adjusting part (71) also comprises regulating part (712), be arranged on to described regulating part (712) adjustable in length on described installing rack (711) and be connected with the described lifting mechanism link of described first paragraph rope body (51), described regulating part (712) has contraction in length and is connected with described running block (713) so that described running block (713) is positioned at the 3rd duty of described the first duty, and be separated so that described running block (713) is positioned at the 4th duty of described the second duty with described running block (713).
7. dynamic compaction machinery according to claim 5, is characterized in that,
Described installing rack (711) has the bending segment of the section of being located thereon, and the cross section of described bending segment reduces gradually along the direction away from described turntable (80);
Described fixed pulley group (714) has two, and two described fixed pulley groups (714) are arranged at respectively on the described bending segment of described installing rack (711), and arranges in turn along the overbending direction of described bending segment.
8. dynamic compaction machinery according to claim 4, is characterized in that,
Described jib (10) is hinged with described turntable (80);
Described dynamic compaction machinery also comprises the jib lubbing mechanism (30) of adjustable in length ground setting, and the first end of described jib lubbing mechanism (30) and described jib (10) are hinged, and the second end of described jib lubbing mechanism (30) is fixedly installed with respect to described turntable (80).
9. dynamic compaction machinery according to claim 8, is characterized in that, any one in the second end of described jib lubbing mechanism (30) and described the first support portion (72), described lifting rope adjusting part (71) or described turntable (80) is hinged.
10. dynamic compaction machinery according to claim 3, it is characterized in that, described dynamic compaction machinery also comprises second support portion (60) of adjustable in length ground setting, described the second support portion (60) is fixedly connected with the side of described turntable (80) away from described jib (10), and along away from the direction of described turntable (80) to downward-extension.
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| CN201310076378.5A CN103132501B (en) | 2013-03-11 | 2013-03-11 | Dynamic compaction machine |
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|---|---|---|---|
| CN201310076378.5A CN103132501B (en) | 2013-03-11 | 2013-03-11 | Dynamic compaction machine |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103132501B (en) | 2015-02-11 |
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