CN103290834A - Dynamic compactor and lifting hook thereof - Google Patents
Dynamic compactor and lifting hook thereof Download PDFInfo
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- CN103290834A CN103290834A CN2013102799620A CN201310279962A CN103290834A CN 103290834 A CN103290834 A CN 103290834A CN 2013102799620 A CN2013102799620 A CN 2013102799620A CN 201310279962 A CN201310279962 A CN 201310279962A CN 103290834 A CN103290834 A CN 103290834A
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- suspension hook
- dynamic compaction
- compaction machinery
- detacher
- pulley
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Abstract
The invention relates to a dynamic compactor and a lifting hook thereof. The lifting hook of the dynamic compactor comprises two side plates, wherein a pulley assembly is arranged between the two side plates through a pulley shaft; a rope baffle is arranged at the two lateral sides and the lower side of the pulley assembly; a beam is arranged below the rope baffle; a nut is arranged at the top part of the beam; the beam is connected to a hook head; the lifting hook is characterized by having a lifting ring structure with a columnar structure integrally arranged at the top part thereof; the columnar structure penetrates through the beam and is connected to the nut; and the lifting ring structure of the hook head is connected to a detacher through a pin shaft. The hook head of the lifting hook of the dynamic compactor can reduce the hazard that the detacher damages an arm frame, and is lighter in dead-weight and simple in structure while the use requirements are satisfied; and binding treatment for the hook head is unnecessary during a transportation process.
Description
Technical field
The present invention relates to engineering machinery field, relate in particular to a kind of dynamic compaction machinery suspension hook and dynamic compaction machinery.
Background technology
Suspension hook lower end on the dynamic compaction machinery connects detacher, and the other end of detacher is hung hammer ram.
As shown in Figure 1, be suspension hook 1 structural representation of present domestic use, it generally comprises: pulley assembly 2, side plate 3, pulley spindle 4, rope shelves 5, nut 6, crossbeam 7, gib head 8, screw 9 and end cap 10.Wherein, the gib head 8 general bigger single hook structures in cross section that adopt of suspension hook 1, and adopt the big alloy steel forging of tensile strength to form.Single hook structure of gib head 8 has determined its weight generally heavier, and when design suspension hook 1, should strictly control the gross weight of suspension hook 1 and the weight of gib head 8.If the gross weight of suspension hook 1 is too light, under the situation of suspension hook zero load, the suffered frictional force of wire rope might be greater than the gross weight of suspension hook 1, and this will cause suspension hook 1 to fall; If the gross weight of suspension hook 1 lays particular stress on, then influenced the lifting performance of dynamic compaction machinery.Therefore, satisfying under the situation of instructions for use, requiring the weight of the gross weight of suspension hook 1 and gib head 8 more light more good, the deadweight of gib head 8 is more light, and its flexibility of revolution is more good.
The detacher of present domestic employing has two kinds of unhook modes: a kind of is that detacher breaks off relations under the effect that the unhook wire rope upwards draws, and abbreviates pull-up detacher 11(as shown in Figure 2); Another kind is that detacher breaks off relations under the drop-down effect of unhook wire rope, abbreviates pull-down detacher 12(as shown in Figure 3).
As shown in Figure 2, when suspension hook hangs up pull-type detacher 11 for 1 time, the gib head 8 of suspension hook 1 connects pull-up detacher 11 by wire rope rope row 13,11 times extension hammer rams 14 of pull-up detacher, one of them side plate 3 arranged outside of suspension hook 1 have a truckle group 15, and the unhook wire rope 16 that arranges on the pull-up detacher 11 is upwards walked around truckle group 15.Suspension hook hangs up the problem that pull-type detacher 11 exists for 1 time: 1) in unhook moment of pull-up detacher 11, the 16 stressed times of unhook wire rope are short, and because 15 outsides that are arranged on one of them side plate 3 of truckle group, therefore cause suspension hook 1 easily and descend hanging detacher 11 to be subjected to force unbalance and return to rock, this will cause the swing of dynamic compaction machinery principal arm.2) can freely rotate around crossbeam 7 owing to gib head 8, when hammer ram 14 rises to certain height, 16 tensions of unhook wire rope, suspension hook 1 is stressed in a side, thereby pull-up detacher 11 rotates and drives hammer ram 14 rotations, hammer ram 14 aloft rotates, and is relatively more dangerous, and the hoist rope that also may cause unhook wire rope 16 and the suspension hook that hoists to use reverses together.3) wire rope rope row 13 bears the weight pulling force of hammer ram 14, unloading suddenly, and wire rope rope row 13 releases energy, upwards there is not restraint, wire rope rope row 13 drives 11 bounce-backs of pull-up detachers, pull-up detacher 11 gib head of suspension hook 1 of damaging easily, thus damage suspension hook.4) because gib head 8 sizes of suspension hook 1 are bigger, unhook wire rope 16 is being under the relaxed state, hangs over easily on the gib head 8 of suspension hook 1.
As shown in Figure 3, when suspension hook 1 time was hung pull-down detacher 12, the gib head 8 of suspension hook 1 connected pull-down detachers 12 by wire rope rope row 13,12 times extension hammer rams 14 of pull-down detacher, and the unhook steel cable 16 of pull-down detacher 12 draws to declivity.The problem that suspension hook is hung 12 existence of pull-down detacher for 1 time is: 1) wire rope rope row 13 bears the weight pulling force of hammer ram 13, suddenly unloading, wire rope rope row 13 releases energy, wire rope rope row 13 is under the effect of the restraint of unhook wire rope 16, random mixed and disorderly releasing energy, drive pull-down detacher 12 and swing, thereby make pull-down detacher 12 jib of damaging.2) unhook wire rope 16 is in contact with one another easily with hammer ram 14, and wearing and tearing cause the damage of unhook wire rope 16 mutually.
Summary of the invention
The objective of the invention is to propose a kind of dynamic compaction machinery suspension hook and dynamic compaction machinery, the gib head of its dynamic compaction machinery suspension hook can reduce the detacher harm of jib of damaging, and is satisfying under the situation of instructions for use, it is lighter to conduct oneself with dignity, simple in structure, and in transportation, need not gib head is wrapped up processing.
For achieving the above object, the invention provides a kind of dynamic compaction machinery suspension hook, comprise two side plates, be provided with pulley assembly by pulley spindle between two side plates, described pulley assembly both sides and below are provided with the rope shelves, described rope shelves below is provided with crossbeam, described crossbeam top is provided with nut, described crossbeam connects gib head, it is characterized in that: described gib head is the suspension ring structure, and its top has been wholely set a column construction, and described column construction passes described crossbeam, be connected with described nut, the suspension ring structure of described gib head is connected with detacher by bearing pin.Technique scheme is removed wire rope rope of the prior art row, adopts gib head and the direct-connected mode of detacher, the energy of having eliminated intermediate link stores, and has reduced the wire rope rope and has arranged the damage harm of jib of detacher that storage power brings; Gib head with suspension hook adopts the suspension ring structure simultaneously, and is simple in structure, easily manufactured, satisfying under the situation of instructions for use, and it is lighter to conduct oneself with dignity, and can save wide variety of materials cost and processing cost; And the gib head of suspension hook is arranged to the suspension ring structure, in the transportation of suspension hook, also need not gib head is wrapped up processing.
Further, described detacher is the pull-up detacher.
Further, described pulley assembly comprises for first pulley that twines the unhook wire rope, and second pulley that is used for twining hoist rope.
Further, described second pulley is even number, is symmetricly set on the both sides of described first pulley.When the pull-up detacher broke off relations under the effect of unhook wire rope, the right and left of suspension hook was stressed evenly, does not rock back and forth about suspension hook and pull-up detacher are not understood.
Further, described pulley assembly comprises at least two pulleys that are used for twining hoist rope, and the unhook wire rope is walked around from the described rope shelves that are positioned at described pulley assembly below.
Further, described detacher is the pull-down detacher.
Further, described pulley assembly comprises at least two pulleys that be used for to twine hoist rope, can realize the bigger multiplying power that hoists.
Further, under the state of being sidelong, each described side plate has two strong points that contact with ground at least, and all strong points of two described side plates are on same horizontal plane.In the process of wire rope, can be sidelong suspension hook, the center of gravity of suspension hook is low, and suspension hook is difficult for toppling under the effect of two side plate strong points.
Further, under the state of being sidelong, the center of gravity of described side plate falls between the described strong point.Suspension hook stress balance, suspension hook are difficult for toppling over when being sidelong transportation or lay winding wire ropes.
Further, two described side plates are pentagonal configuration, and it has two groups of symmetry limits, and first group of symmetry limit joins, and second group of symmetry two limit in the limit joins on corresponding two limits with first group of symmetry limit respectively, and two groups of symmetry limits are the arc limit that concaves.
For achieving the above object, the invention provides a kind of dynamic compaction machinery, it is characterized in that: it adopts above-mentioned dynamic compaction machinery suspension hook.It has the beneficial effect of above-mentioned dynamic compaction machinery suspension hook accordingly.
Based on technique scheme, the present invention adopts the gib head of suspension ring structure, can reduce the detacher harm of jib of damaging, and satisfy under the situation of instructions for use, and it is lighter, simple in structure to conduct oneself with dignity, and in transportation, need not gib head is wrapped up processing.Further, can avoid causing the problem of dynamic compaction machinery principal arm swing because the pull-up detacher breaks off relations, and can realize the multiplying power that hoists that dynamic compaction machinery is bigger.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is that suspension hook is formed schematic diagram in the prior art;
Fig. 2 is for hanging up pull-type detacher schematic diagram under the suspension hook in the prior art;
Fig. 3 hangs pull-down detacher schematic diagram under the suspension hook in the prior art;
Fig. 4 is an embodiment schematic diagram of dynamic compaction machinery suspension hook of the present invention;
Fig. 5 is the A-A schematic diagram of Fig. 4;
Fig. 6 is rope shelves and crossbeam and side plate connection diagram among the dynamic compaction machinery suspension hook embodiment of the present invention;
Fig. 7 is dynamic compaction machinery suspension hook embodiment part cross-sectional schematic of the present invention;
Fig. 8 is for hanging pull-down detacher schematic diagram under the dynamic compaction machinery suspension hook embodiment of the present invention;
Fig. 9 is the B-B schematic diagram of Fig. 8;
Figure 10 hangs up pull-type detacher schematic diagram under the dynamic compaction machinery suspension hook embodiment of the present invention;
Figure 11 is the C-C schematic diagram of Figure 10;
Figure 12 hangs up pull-type detacher wire rope and walks around schematic diagram from the rope shelves under the machine suspension hook embodiment for the present invention rams;
Figure 13 is for dynamic compaction machinery suspension hook embodiment transportation of the present invention with around the wire rope view.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme among the embodiment is clearly and completely described.Obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As Fig. 4, shown in Figure 5, dynamic compaction machinery suspension hook 17 provided by the invention comprises the side plate 18 that two parallel interval arrange, be provided with pulley assembly between two side plates 18, pulley assembly comprises at least one pulley 19, is provided with three pulley 19(in the embodiment accompanying drawing provided by the invention but is not limited thereto).One pulley spindle 20 passes wherein side plate 18 successively, each pulley 19 and another side plate 18, pulley 19 inside are provided with bearing, can rotate around pulley spindle 20, the two ends that pulley spindle 20 is positioned at two side plate 18 outsides are respectively arranged with a hubcap 21, side plate 18 and pulley assembly are compressed, and side plate 18 breaks away from pulley spindle 19 when preventing that pulley assembly is subjected to lateral force.
As Fig. 6, shown in Figure 7, between two side plates 18, the both sides of pulley assembly and below are provided with rope shelves 22, each rope shelves 22 structural similarity that is parallel to each other.The two ends correspondence of rope shelves 22 is passed the side plate 18 of respective side, and the both ends of rope shelves 22 are provided with screw thread, by the hold-down nut 23 that is threaded, the shelves 22 of will restricting are fixing with side plate 18, can prevent in the course of the work that by rope shelves 22 wire rope breaks away from grooving, damage wire rope.The below of rope shelves 22 that is positioned at the below is provided with crossbeam 24, and the two ends correspondence of crossbeam 24 is passed the side plate 18 of respective side, and the baffle plate 25 of the both ends of crossbeam 24 by strap bolt is fixed together side plate 18 and crossbeam 24.Crossbeam 24 tops are provided with suspension hook bearing 26, and the top of suspension hook bearing 26 is provided with hook nut 27.
As shown in Figure 7, gib head 28 provided by the invention is suspension ring shape structure, its top has been wholely set a cylindrical structure, the suspension hook bearing 26 that cylindrical structure passes crossbeam 24 and crossbeam 24 tops is threaded with hook nut 27, gib head 28 can be around the axis rotation by suspension hook bearing 26 supportings at crossbeam 24 tops.The suspension ring structure of gib head 28 is used for being connected with detacher by bearing pin.Gib head 28 provided by the invention is suspension ring formula structure, is satisfying under the situation of instructions for use, compares with the gib head of single hook structure, and weight is lighter.
Dynamic compaction machinery provided by the invention adopts above-mentioned dynamic compaction machinery suspension hook 17, and dynamic compaction machinery suspension hook 17 can following be hung pull-down detacher 29(as shown in Figure 8), also can below hang up pull-type detacher 30(as shown in figure 11).
As Fig. 8, shown in Figure 9, when dynamic compaction machinery suspension hook provided by the invention is hung pull-down detacher 29 17 times, pulley 19 between two side plates 18 can arrange more than one, each pulley 19 on the dynamic compaction machinery suspension hook 17 can be realized the multiplying power that hoists that dynamic compaction machinery is bigger around full hoist rope (not shown) simultaneously, be three pulleys 19 shown in the embodiment accompanying drawing provided by the invention, so the maximum of the hoist rope multiplying power that hoists can reach 6 multiplying powers.Pull-down detacher 29 breaks off relations under the drop-down effect of unhook wire rope 31.
As Figure 10, shown in Figure 11, when dynamic compaction machinery suspension hook provided by the invention hangs up pull-type detacher 30 for 17 times, pulley 19 between two side plates 18 can be set to the odd number more than three, be three pulleys 19 shown in the embodiment accompanying drawing provided by the invention, unhook wire rope 31 can pass the pulley 19 of dynamic compaction machinery suspension hook 17 centres, twines the hoist rope (not shown) on the dynamic compaction machinery suspension hook 17 on the symmetrically arranged pulley 19 in pulley 19 both sides of centre.When this pull-up detacher 30 broke off relations under the effect of unhook wire rope 31, the right and left of dynamic compaction machinery suspension hook 17 was stressed evenly, does not rock back and forth about dynamic compaction machinery suspension hook 17 and pull-up detacher 30 are not understood.Simultaneously because the pulley 19 that twines hoist rope more than one, also can be realized the bigger multiplying power that hoists.
As shown in figure 12, when dynamic compaction machinery suspension hook provided by the invention hangs up pull-type detacher 30 for 17 times, pulley 19 between two side plates 18 can arrange more than one, each pulley 19 on the dynamic compaction machinery suspension hook 17 also can be simultaneously around full hoist rope, unhook wire rope 31 is walked around from the rope shelves 22 of pulley assembly below, deep in view of the grooving of pulley 19, hoist rope is tightened up when hoisting, can the phase mutual friction between hoist rope and the unhook wire rope 31, interference.
In above-described embodiment, the pulley 19 between two side plates 18 of dynamic compaction machinery suspension hook 17 also can be provided with two or other a plurality of pulleys except three shown in the embodiment of the invention accompanying drawing.Twine the pulley 19 of hoist rope on the dynamic compaction machinery suspension hook 17 more than one, and then can realize the multiplying power that hoists that dynamic compaction machinery is bigger.Most of dynamic compaction machinery adopts the 3-6 multiplying power that hoists doubly many, multiplying power is many again, the efficient of dynamic compaction machinery often is not accepted slowly very much that (dynamic compaction machinery energy level size refers to weight and the lifting altitude of hammer ram, improve hammer ram weight, be an approach that improves dynamic compaction machinery energy level size, increasing lifting altitude also is an approach that improves dynamic compaction machinery level size).
As shown in figure 13, two side plates 18 of dynamic compaction machinery suspension hook 17 provided by the invention can adopt identical structure, be sidelong under the state at dynamic compaction machinery suspension hook 17, each side plate has two strong points that contact with ground at least, at least four strong points of two side plates 18 are on same horizontal plane, the gravitational equilibrium of the support force of side plate 18 and dynamic compaction machinery suspension hook 17, the center of gravity of side plate 18 falls between the strong point.Two side plates 18 can be symmetrically arranged pentagonal configuration, this pentagonal configuration has two groups of symmetrically arranged limits, first group of symmetry limit joins, second group of symmetry two limit in the limit, two limits in corresponding and the first group of symmetry limit respectively join, the contact both sides on first group of symmetry limit have two contacts respectively, the contact of both sides is symmetrical arranged, and two contacts that are positioned at same side can be used as the strong point.These two groups symmetry limits all can be the arc limit to side plate 18 indents.
In the process of wire rope, only need be sidelong dynamic compaction machinery suspension hook 17, the center of gravity of dynamic compaction machinery suspension hook 17 is low, dynamic compaction machinery suspension hook 17 is at two side plates 18 altogether under the effect of at least four strong points, be difficult for toppling over, and in the transportation of dynamic compaction machinery suspension hook 17, also need not gib head is wrapped up processing.
Dynamic compaction machinery provided by the invention, method of operating when its dynamic compaction machinery suspension hook hangs up pull-type detacher 30 for 17 times is: be sidelong dynamic compaction machinery suspension hook 17, at least four strong points by two side plates 18 support dynamic compaction machinery suspension hook 17, at gib head 28 pull-up detacher 30 is set, pulley 19 in the centre twines unhook wire rope 31, twine hoist rope at other pulleys 19 of both sides of the pulley 19 of centre and (perhaps all twine hoist rope on all pulleys 19, unhook wire rope 31 is walked around from the rope shelves of pulley assembly below), erect dynamic compaction machinery suspension hook 17,30 times extension hammer rams of pull-up detacher, after dynamic compaction machinery is mentioned eminence with hammer ram, pull-up detacher 30 is under the effect of unhook wire rope 31, hammer ram is broken off relations, freely fall, give ground with shock and vibration, repeated multiple times is carried out strong compaction to the soil body, thereby improves the intensity of ground, reduce compressibilty, improve the opposing vibrating liquefaction ability of ground, eliminate settlement by soaking etc.
Dynamic compaction machinery provided by the invention, method of operating when its dynamic compaction machinery suspension hook is hung pull-down detacher 29 17 times is: be sidelong dynamic compaction machinery suspension hook 17, at least four strong points by two side plates 18 support dynamic compaction machinery suspension hook 17, at gib head 28 pull-down detacher 29 is set, on all pulleys 19 between the biside plate 18, all twine hoist rope, erect dynamic compaction machinery suspension hook 17,29 times extension hammer rams of pull-down detacher, after dynamic compaction machinery is mentioned eminence with hammer ram, pull-down detacher 29 is under the effect of unhook wire rope 31, hammer ram is broken off relations, freely fall, give ground with shock and vibration, repeated multiple times is carried out strong compaction to the soil body, thereby improves the intensity of ground, reduce compressibilty, improve the opposing vibrating liquefaction ability of ground, eliminate settlement by soaking etc.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (11)
1. dynamic compaction machinery suspension hook, comprise two side plates, be provided with pulley assembly by pulley spindle between two side plates, described pulley assembly both sides and below are provided with the rope shelves, described rope shelves below is provided with crossbeam, described crossbeam top is provided with nut, described crossbeam connects gib head, it is characterized in that: described gib head is the suspension ring structure, its top has been wholely set a column construction, described column construction passes described crossbeam, is connected with described nut, and the suspension ring structure of described gib head is connected with detacher by bearing pin.
2. dynamic compaction machinery suspension hook as claimed in claim 1, it is characterized in that: described detacher is the pull-up detacher.
3. dynamic compaction machinery suspension hook as claimed in claim 2 is characterized in that: described pulley assembly comprises for first pulley that twines the unhook wire rope, and second pulley that is used for twining hoist rope.
4. dynamic compaction machinery suspension hook as claimed in claim 3, it is characterized in that: described second pulley is even number, is symmetricly set on the both sides of described first pulley.
5. dynamic compaction machinery suspension hook as claimed in claim 2 is characterized in that: described pulley assembly comprises at least two pulleys that are used for twining hoist rope, and the unhook wire rope grade is walked around from the described rope that is positioned at described pulley assembly below.
6. dynamic compaction machinery suspension hook as claimed in claim 1, it is characterized in that: described detacher is the pull-down detacher.
7. dynamic compaction machinery suspension hook as claimed in claim 6 is characterized in that: described pulley assembly comprises at least two pulleys that are used for twining hoist rope.
8. dynamic compaction machinery suspension hook as claimed in claim 1, it is characterized in that: under the state of being sidelong, each described side plate has two strong points that contact with ground at least, and all strong points of two described side plates are on same horizontal plane.
9. dynamic compaction machinery suspension hook as claimed in claim 8, it is characterized in that: under the state of being sidelong, the center of gravity of described side plate falls between the described strong point.
10. dynamic compaction machinery suspension hook as claimed in claim 9, it is characterized in that: two described side plates are pentagonal configuration, it has two groups of symmetry limits, first group of symmetry limit joins, second group of symmetry two limit in the limit joins on corresponding two limits with first group of symmetry limit respectively, and two groups of symmetry limits are the arc limit that concaves.
11. a dynamic compaction machinery is characterized in that: it adopts each described dynamic compaction machinery suspension hook as claim 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310279962.0A CN103290834B (en) | 2013-07-05 | 2013-07-05 | Dynamic compactor and lifting hook thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310279962.0A CN103290834B (en) | 2013-07-05 | 2013-07-05 | Dynamic compactor and lifting hook thereof |
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| CN103290834A true CN103290834A (en) | 2013-09-11 |
| CN103290834B CN103290834B (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310279962.0A Active CN103290834B (en) | 2013-07-05 | 2013-07-05 | Dynamic compactor and lifting hook thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109185384A (en) * | 2018-11-23 | 2019-01-11 | 高旭春 | Freely falling body restrains buffer to other side |
| CN112726608A (en) * | 2020-12-21 | 2021-04-30 | 东台康鼎工程机械制造有限公司 | Automatic unhooking device of pile hammer |
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| CN103086262A (en) * | 2013-01-29 | 2013-05-08 | 徐工集团工程机械股份有限公司 | Self weight-adjustable lifting hook and crane with same |
| CN103101837A (en) * | 2011-11-10 | 2013-05-15 | 徐工集团工程机械股份有限公司 | Detection apparatus for rotational flexibility of lifting hook and lifting hook structure |
| CN203373729U (en) * | 2013-07-05 | 2014-01-01 | 徐工集团工程机械股份有限公司 | Dynamic-compactor lifting hook and dynamic compactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100607536B1 (en) * | 2004-06-05 | 2006-08-03 | 삼일토건(주) | Tamper equipped with Towing device |
| CN103101837A (en) * | 2011-11-10 | 2013-05-15 | 徐工集团工程机械股份有限公司 | Detection apparatus for rotational flexibility of lifting hook and lifting hook structure |
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| CN103086262A (en) * | 2013-01-29 | 2013-05-08 | 徐工集团工程机械股份有限公司 | Self weight-adjustable lifting hook and crane with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109185384A (en) * | 2018-11-23 | 2019-01-11 | 高旭春 | Freely falling body restrains buffer to other side |
| CN109185384B (en) * | 2018-11-23 | 2023-08-11 | 高旭春 | Free falling body opposite-side holding buffer |
| CN112726608A (en) * | 2020-12-21 | 2021-04-30 | 东台康鼎工程机械制造有限公司 | Automatic unhooking device of pile hammer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103290834B (en) | 2015-05-27 |
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