CN103215954A - Reinforcement type sealed cylinder type hydraulic pile hammer - Google Patents
Reinforcement type sealed cylinder type hydraulic pile hammer Download PDFInfo
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- CN103215954A CN103215954A CN201310107358XA CN201310107358A CN103215954A CN 103215954 A CN103215954 A CN 103215954A CN 201310107358X A CN201310107358X A CN 201310107358XA CN 201310107358 A CN201310107358 A CN 201310107358A CN 103215954 A CN103215954 A CN 103215954A
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Abstract
The invention discloses a reinforcement type sealed cylinder type hydraulic pile hammer which comprises a hydraulic power station, a hydraulic pile hammer body and an electric control system, wherein the hydraulic pile hammer body is formed by the means that an upper hammer body, a middle hammer body, a lower hammer body and a bottom hammer body are connected with one another, the upper hammer body, the middle hammer body, the lower hammer body and the bottom hammer body are arranged on one axis, and the upper hammer body, the middle hammer body and the lower hammer body respectively form a respective seal structure; and the upper hammer body consists of a high-pressure nitrogen room, as well as a high-pressure energy accumulator, a single-action lifting oil cylinder, two single-action air cylinders and a low-pressure energy accumulator arranged within the high-pressure nitrogen room, a rod-free cavity of the single-action lifting oil cylinder is communicated with the high-pressure nitrogen room, rod-free cavities of the single-action air cylinders are pre-filled with 3-4MPA medium pressure air, and rod cavities of the single-action air cylinders are vacuum cavities. After the reinforcement type sealed cylinder type hydraulic pile hammer is used, under the conditions of same hammer core weight and same rising height, the falling accelerated speed of a hammer core can be greatly improved, and the high-tightness designing and machining requirement of a large-diameter hammer cylinder and a movement hammer core can be reduced.
Description
Technical field
The invention belongs to the hydraulic pile hammer technical field, relate in particular to a kind of force booster type closed cylinder type hydraulic pile hammer of using in the offshore oil engineering.
Background technology
Hydraulic pile hammer is the important construction equipment of the marine erection stage of offshore platform, indispensable in the oil platform pile foundation engineering, hydraulic pile hammer mainly is made up of several sections such as hammer body, power station and control systems, wherein, the part that control system is responsible for comprises rising and falling of control pile hammer hammer core, thereby finishes the piling process.By with power station in the mutual communication of control system, finish monitoring and adjustment to call parameter in the control system, guarantee the harmony of whole pile hammer system works.At present, hydraulic pile hammer both domestic and external mainly is divided into several forms:
First kind of pattern is to utilize the double acting jump bit of the hammer core self gravitation and the hydraulic oil thrust of the lift cylinder that is used for the lift hammer core in hammer core dropping process, and this class is hammered attainable whereabouts acceleration into shape generally at 1.6-2 acceleration of gravity;
Second kind of form is Double Acting Hydraulic Pile Hammer With Double Cylinder, the Double Acting Hydraulic Pile Hammer With Double Cylinder of generally using all is to adopt the biliquid compressing cylinder to be symmetrically arranged both at home and abroad, be used for common lift hammer core, on the described hydraulic jack two-way plug-in valve is housed, the external control sequence valve, a plurality of control valve elements such as two-bit triplet electromagnetic valve, the open and close of these control valves all need the time, owing to respectively be equipped with a cover control valve element on two oil cylinders each other, therefore it is different to have valve body each other spool wearing and tearing after work a period of time, and then can cause two oil cylinder piston bars asynchronous commutating period, fluid enters two oil cylinders respectively by above-mentioned nonsynchronous valve and will shunt the irregular twin-tub asynchrony phenomenon that causes at this moment, this phenomenon will prolong the synchronous rise and fall time of twin-tub, the length of commutating period can directly influence the oil cylinder piston bar speed that moves up and down, hammer core cycle can be affected in a period of time under the continuous duty, makes the operating efficiency of pile hammer seriously reduce;
In addition, Chinese patent " multi-function closed cylinder type hydraulic piling hammer " (notification number is CN101748730B), its action principle is: except that in hammer core dropping process, utilize the additional active force of self gravitation and lift cylinder top also respectively in airtight hammer cylinder barrel on the top of hammer core be provided with an air chamber be used to increase a compressed air thrust and on hammer the core bottom into shape and one vacuum chamber is set is used to increase a pull of vacuum, there are four active forces identical to act on the hammer core altogether, make the hammer core in the process that falls, obtain bigger whereabouts acceleration with the hammer core direction of motion.
But, should " multi-function closed cylinder type hydraulic piling hammer " have following defective in manufacturing and use: in fact the vacuum that (1) goes up the bottom setting of hammer core can't realize, because, realize that vacuum must guarantee to hammer into shape the sealing between cylinder barrel and the upper and lower hammer core, present stage, can't process fineness and the exigent axiality of 0.4-0.2 both at home and abroad for the cylindrical shell that reaches 7～8m than major diameter 800～1800mm and ldd length; (2) on, under hammer into shape between the core and easily to form cushioning effect, and then cause, hammering core down into shape does not contact and hammers into shape cylinder barrel and rise and split the generation of phenomenon, because, if on, hammer down that core and the sealing of hammer between the cylinder barrel are not guaranteed into shape or in use because last hammer core makes vacuum environment not exist with hammering into shape to rub between the cylinder barrel, the gas of last hammer core top band pressure progresses into last hammer core motion, under hammer into shape between the core, can't discharge, can gather a large amount of gases in short period and form air cushion, air cushion can form vapour lock influence hammer core falling speed, and the hammer core whereabouts that weight is bigger when serious can will be hammered cylinder barrel into shape by air cushion and rises gradually and split; (3) go up on the hammer core, following friction of motion resistance is big, influence hammer core movement velocity and acceleration, therefore, if will realize the vacuum chamber requirement of hammer core bottom, often need to increase seal quantity, concerning major diameter hammer cylinder barrel, the seal usage quantity is many more, promptly means with the contact area of cylinder barrel big more, make frictional resistance very big, very important, be that friction also produces a large amount of heat effects cylinder strengths in the high-speed motion of per minute 42 times at pile hammer hammer core number of times commonly used, the cylindrical shell machining accuracy will change, cause barrel distortion, seal failure, vacuum failure.
Summary of the invention
In order to overcome the problem in the background technology, the purpose of this invention is to provide a kind of force booster type closed cylinder type hydraulic pile hammer, in equal hammer core weight, under the equal lifting height condition, hammer core whereabouts acceleration be can improve largely, and major diameter hammer tube and design and the processing request of motion hammer core reduced high leakproofness.
In order to realize the foregoing invention purpose, the present invention adopts technical scheme as described below:
A kind of force booster type closed cylinder type hydraulic pile hammer, comprise hydraulic power station, hydraulic pile hammer body and electric-control system, described hydraulic pile hammer body is connected to form by top hammer body, middle part hammer body, bottom hammer body and bottom hammer body, above-mentioned four parts all on an axis, wherein, top hammer body, middle hammer body and bottom hammer body form closed structure separately respectively;
The top hammer body is by the elevated pressure nitrogen air chamber and be installed in high pressure accumulator, the single-acting lift cylinder of high pressure nitrogen chamber interior, two single-acting cylinders and low pressure accumulator and form, the rodless cavity of described single-acting lift cylinder is communicated with the elevated pressure nitrogen air chamber, be filled with the middle pressure air of 3～4MPA in the rodless cavity of described single-acting cylinder in advance, the rod chamber of single-acting cylinder is a vacuum chamber;
Middle hammer body is made up of hydraulic manifold block assembly, oil-feed control valve and oil return control valve, and oil-feed control valve and oil return control valve are installed on the hydraulic manifold block assembly;
The bottom hammer body by hammer cylindrical shell, sensor and be installed in the hammer inner barrel go up the hammer core, on hammer into shape the core sealing device, down hammer into shape core and down hammer core sealing device form, the upper/lower terminal portion of last hammer core is provided with hammer core sealing device, last hammer core is cylindrical structure, and on cylindrical external surface, be extended with annular boss, annular boss is laid with axially extending bore along its circumferencial direction, the described core of hammer down is positioned at the bottom of hammer core, hammer the bottom that the core sealing device is arranged on down the hammer core down into shape, sensor is arranged on the outer wall of hammering cylindrical shell into shape and is electrically connected with described electric-control system;
Described bottom hypophysis directly contacts with hammering core down into shape for block hitting by forming for block hitting and pile protection tube, is installed in the pile protection tube for block hitting.
Further, the rodless cavity of described single-acting cylinder is by connecting the external middle air cushioning jar of pressing of hose assembly, and middle pressure air cushioning jar adds the air of 3MP--4MP in advance.
The operating principle of this force booster type closed cylinder type hydraulic pile driver is described below:
The hydraulic oil that hydraulic power station provides enters the hydraulic pile hammer hammer body by the road, when oil-feed control valve and oil return control valve are opened simultaneously, the hydraulic power station oil-feed is got back to hydraulic power station through the pile hammer hydraulic system, and hydraulic system is carried out idle cycle work, and system is carried out preheating.
During piling work, after hydraulic system preheating work is finished, to at first be that high pressure accumulator is oil-filled, when high pressure accumulator oil-filled when the system pressure, the oil-feed control valve is opened, the oil return control valve is closed, hydraulic oil enters the rod chamber of single-acting lift cylinder, the energy that hydraulic oil provides overcomes the air pressure of the nitrogen pressure of single-acting lift cylinder rodless cavity, two single-acting cylinder rodless cavities and pull of vacuum and frictional force and other mechanical resistances in the rod chamber, the hammer core is up in the lifting, is gone up the lifting height of hammer core by electric-control system and sensor control.When last hammer core rises to setting height, close the oil-feed control valve; At this moment, oil-feed control valve, oil return control valve all are in closed condition, on hammer core into shape and hover over desired location.
When last hammer core hovers over desired location, open the oil return control valve, pull of vacuum in the pressure of the middle pressure air (pressure is 3MP-4MP) of last hammer core in the rodless cavity inner high voltage nitrogen gas pressure of self gravitation, single-acting lift cylinder, two single-acting cylinder rodless cavities and two the single-acting cylinder rod chambers, amount under the effect of 6 power, overcome the influence of oil extraction resistance, seal friction power and other mechanical resistances in the single-acting lift cylinder rod chamber, quicken to move downward; Simultaneously,, make and go up the hammer core when moving downward because last hammer core is provided with through hole, on hammer the core bottom into shape air arrive the top of going up the hammer core along through hole, reduced air resistance greatly, effectively increased the acceleration that last hammer core falls; Last hammer core moves downward process mesolow accumulator and absorbs the hydraulic oil of discharging in the single-acting lift cylinder rod chamber, thereby reduces because long pipe runs to the influence of oil extraction speed, reduces the oil extraction resistance; When last hammer core moves to down the hammer core, bump, following hammer core moves downward, and drives moving downward for block hitting and pile protection tube of contact with it.
Because adopt technique scheme, the present invention has following superiority:
1, the present invention is by being provided with two single-acting cylinders on the hammer body of top, and the rod chamber of single-acting cylinder is made as vacuum chamber and its rodless cavity is filled with the middle air of pressing, increased with last hammer core and moved downward the identical active force of direction, the acceleration that the hammer core falls on can effectively improving;
2, the hammer core of going up among the present invention is made as the structure which is provided with through hole, make the air of going up hammer core upper and lower circulate mutually, do not need to guarantee hammer core upper and lower high leakproofness requirement separately, reduced seal quantity, reduction in a big way frictional resistance and the air resistance in the last hammer core decline process, can effectively improve the acceleration when going up the hammer core and falling.
3, structure design of the present invention has reduced the processing and manufacturing difficulty, and cost of production reduces greatly simultaneously.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of hydraulic manifold block assembly among Fig. 1;
Fig. 3 is a structural representation of going up the hammer core among Fig. 1;
Fig. 4 is the vertical view of Fig. 3;
Among the figure: 1-elevated pressure nitrogen air chamber; The 2-single-acting cylinder; 3-single-acting lift cylinder; 4-hydraulic manifold block assembly; 5-hammers cylindrical shell into shape; The 6-sensor; The last hammer of 7-core sealing device; The last hammer of 8-core; 9-is the hammer core down; 10-is hammer core sealing device down; 11-is for block hitting; 12-pile protection tube; 13-oil-feed control valve; The 14-high pressure accumulator; The 15-low pressure accumulator; 16-oil return control valve; Press the air cushioning jar among the 17-; 18-connects hose assembly; The 19-through hole.
The specific embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in further detail.
Embodiment one
In conjunction with Fig. 1 and Fig. 2, described force booster type closed cylinder type hydraulic pile hammer is made up of hydraulic power station, hydraulic pile hammer body and electric-control system; Described hydraulic pile hammer body is connected to form by top hammer body, middle part hammer body, bottom hammer body and bottom hammer body, above-mentioned four parts all on an axis, wherein, top hammer body, middle hammer body and bottom hammer body form closed structure separately respectively; The top hammer body is by elevated pressure nitrogen air chamber 1 and be installed in the high pressure accumulator 14, single-acting lift cylinder 3 of elevated pressure nitrogen air chamber 1 inside, two single-acting cylinders 2 and low pressure accumulator 15 and form, the rodless cavity of described single-acting lift cylinder 3 is communicated with elevated pressure nitrogen air chamber 1, be filled with the middle pressure air of 3～4MPA in the rodless cavity of described single-acting cylinder 2 in advance, the rod chamber of single-acting cylinder 2 is a vacuum chamber;
As shown in Figure 2, middle hammer body is made up of hydraulic manifold block assembly 4, oil-feed control valve 13 and oil return control valve 16, oil-feed control valve 13 and oil return control valve 16 are installed on the hydraulic manifold block assembly 4, described hydraulic manifold block assembly 4 according to the signal controlling that electric-control system sends advance, the opening and closing of oil return control valve, and then the moving up and down of control single-acting lift cylinder 3 piston rods.
The bottom hammer body is by hammer cylindrical shell 5, sensor 6 and the upward hammer core 8 that is installed in hammer cylindrical shell 5 inside, last hammer core sealing device 7, under hammer into shape core 9 and down hammer core sealing device 10 form, on the last hammer core 8, following both ends are provided with hammer core sealing device 7, last hammer core 8 is cylindrical structure, and on cylindrical external surface, be extended with annular boss, annular boss is laid with axially extending bore 19 along its circumferencial direction, the described core 9 of hammer down is positioned at the bottom of hammer core 8, hammer the bottom that core sealing device 10 is arranged on down hammer core 9 down into shape, sensor 6 is arranged on the outer wall of hammer cylindrical shell 5, and sensor 6 and electric-control system are electrically connected and are used to control the height that hammer core 8 rises; The single-acting lift cylinder 3 of described top hammer body passes hydraulic manifold block assembly 4 respectively with the piston rod of two single-acting cylinders 2 and is connected with last hammer core 8.
Described bottom hypophysis directly contacts with hammering core 9 down into shape for block hitting 11 by forming for block hitting 11 and pile protection tube 12, is installed in the pile protection tube 12 for block hitting 11.
The rodless cavity of described single-acting cylinder 2 is by connecting the hose assembly 18 external middle air cushioning jars of pressing, and middle pressure air cushioning jar 17 adds the air of 3MP～4MP in advance; When last hammer core 8 moves back and forth, because the rodless cavity of middle pressure air cushioning jar 17 and single-acting cylinder 2 is connected, therefore, pressure in single-acting cylinder 2 rodless cavities can not produce bigger variation owing to the reciprocating motion of last hammer core 8, makes that the active force of middle pressure air effect on last hammer core 8 in single-acting cylinder 2 rodless cavities remains constant; In addition, also can be according to the drive piles blow energy of needs of reality, the quantity that increases single-acting cylinder 2 is to obtain bigger hammer core whereabouts acceleration, the corresponding middle pressure air cushioning jar that just needs to increase equal number of the increase of single-acting cylinder 2 quantity.
Shown in Fig. 3,4, the described hammer core of going up is cylindrical structure, and on cylindrical external surface, be extended with annular boss, annular boss is laid with axially extending bore along its circumferencial direction, on hammer core 8 this structure Design into shape, the air between upper and lower end that make to go up hammer core 8 and the hammer cylindrical shell 5 between two air chambers of formation can circulate mutually, on the one hand, can make hammer core 8 when falling, on hammer core 8 bottoms into shape air enter into its top along through hole, reduced air resistance; On the other hand, need not guarantee hammer core 8 and hammer between the cylindrical shell 5 than high leakproofness, the usage quantity of seal is less, only needs seal to play a guide effect of hammering core 8 into shape and gets final product, frictional resistance is also corresponding to be reduced, and has further improved last hammer core 8 whereabouts acceleration.
Hydraulic pile hammer of the present invention makes the hammer core utilize himself gravity in dropping process, high pressure nitrogen pressure in the single-acting lift cylinder rodless cavity, the pressure of the middle pressure air in two single-acting cylinder rodless cavities, two pulls of vacuum that the single-acting cylinder rod chamber is interior, it is identical with hammer core falling direction to amount to 6 active forces, than existing " multi-function closed cylinder type hydraulic piling hammer " many two active forces, thereby make the acceleration of gravity of hammering many 1～2 G of acceleration ratio existing " multi-function closed cylinder type hydraulic piling hammer " that obtain under the prerequisite of the equal height of drop of core weight into shape equal, can more easily realize hammering into shape the acceleration of gravity of 4～5 G of core whereabouts acceleration according to present technical condition.
The present invention compares with existing " Double Acting Hydraulic Pile Hammer With Double Cylinder ", press the air cushioning jar during two single-acting cylinders among the present invention are directly external, the commutation of cylinder piston rod need not control valve elements such as reversal valve, therefore there is not the influence of commutating period, can realize synchronous effect, operating efficiency has improved greatly; In addition, the hammer core is in dropping process, the present invention have 6 with hammer core falling direction identical active force, have more 4 active forces than existing " Double Acting Hydraulic Pile Hammer With Double Cylinder ", thereby make the acceleration of gravity of many 2～3 G of acceleration ratio " Double Acting Hydraulic Pile Hammer With Double Cylinder " that the present invention obtains under the prerequisite of equal hammer core weight, equal height of drop.
Embodiment two
Structure of the present invention is with reference to embodiment one, and difference is that the rod chamber with the single-acting cylinder among the embodiment one 2 is not made as vacuum structure, and the rod chamber and last hammer core 8 tops of single-acting cylinder 2 are connected with the air chamber that hammer cylindrical shell 5 forms.
The hydraulic pile hammer of this programme makes the hammer core utilize the pressure of the middle pressure air in high pressure nitrogen pressure in himself gravity, the single-acting lift cylinder rodless cavity, two the single-acting cylinder rodless cavities in dropping process, it is identical with hammer core falling direction to amount to 4 active forces, is to obtain bigger acceleration in the hammer heart dropping process.
Claims (2)
1. force booster type closed cylinder type hydraulic pile hammer, comprise hydraulic power station, hydraulic pile hammer body and electric-control system, described hydraulic pile hammer body is connected to form by top hammer body, middle part hammer body, bottom hammer body and bottom hammer body, above-mentioned four parts all on an axis, wherein, top hammer body, middle hammer body and bottom hammer body form closed structure separately respectively, it is characterized in that:
The top hammer body is by elevated pressure nitrogen air chamber (1) and be installed in elevated pressure nitrogen air chamber (1) inner high pressure accumulator (14), single-acting lift cylinder (3), two single-acting cylinders (2) and low pressure accumulator (15) and form, the rodless cavity of described single-acting lift cylinder (3) is communicated with elevated pressure nitrogen air chamber (1), be filled with the middle pressure air of 3～4MPA in the rodless cavity of described single-acting cylinder (2) in advance, the rod chamber of single-acting cylinder (2) is a vacuum chamber;
Middle hammer body is made up of hydraulic manifold block assembly (4), oil-feed control valve (13) and oil return control valve (16), and oil-feed control valve and oil return control valve are installed on the hydraulic manifold block assembly (4);
The bottom hammer body is by hammer cylindrical shell (5), sensor (6) and be installed in hammer cylindrical shell (5) inner go up hammer core (8), last hammer core sealing device (7), under hammer into shape core (9) and down hammer core sealing device (10) form, on the last hammer core, following both ends are provided with hammer core sealing device (7), last hammer core (8) is cylindrical structure, and on cylindrical external surface, be provided with annular boss, annular boss is laid with axially extending bore (19) along its circumferencial direction, the described core of hammer down is positioned at the bottom of hammer core, hammer the bottom that core sealing device (10) is arranged on down the hammer core down into shape, sensor (6) is arranged on the outer wall of hammering cylindrical shell (5) into shape and is electrically connected with described electric-control system;
Bottom hypophysis directly contacts with following hammer core for block hitting (11) by forming for block hitting (11) and pile protection tube (12), is installed in the pile protection tube for block hitting.
2. force booster type closed cylinder type hydraulic pile hammer according to claim 1, it is characterized in that: the rodless cavity of described single-acting cylinder (2) is by connecting the external middle air cushioning jar (17) of pressing of hose assembly (18), and middle pressure air cushioning jar adds the air of 3MP--4MP in advance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310107358.XA CN103215954B (en) | 2013-03-29 | 2013-03-29 | Reinforcement type sealed cylinder type hydraulic pile hammer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310107358.XA CN103215954B (en) | 2013-03-29 | 2013-03-29 | Reinforcement type sealed cylinder type hydraulic pile hammer |
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| CN103215954A true CN103215954A (en) | 2013-07-24 |
| CN103215954B CN103215954B (en) | 2015-01-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105926620A (en) * | 2016-04-26 | 2016-09-07 | 中国海洋石油总公司 | Portable variable-diameter pile sleeve device for pile driving |
| CN106522205A (en) * | 2016-12-30 | 2017-03-22 | 上海市机械施工集团有限公司 | Pile cap |
| CN108301411A (en) * | 2018-02-14 | 2018-07-20 | 佛山市隆格自动化科技有限公司 | It is a kind of can precise elevation hydraulic hammer pile-driving method and its using this method hydraulic hammer |
| CN108375947A (en) * | 2018-05-21 | 2018-08-07 | 广东力源液压机械有限公司 | A kind of hydraulic pile hammer real-time running state monitoring method and its system |
| CN111059085A (en) * | 2019-12-26 | 2020-04-24 | 太重（天津）重型装备科技开发有限公司 | Integrated energy accumulator device for hydraulic pile hammer |
| CN112065816A (en) * | 2020-09-16 | 2020-12-11 | 中机锻压江苏股份有限公司 | Length-variable full-built-in hydraulic ramming hammer |
| CN114351705A (en) * | 2022-02-22 | 2022-04-15 | 南京工业大学 | Dual-mode portable pneumatic hammer for rapidly planting piles in breach plugging |
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| CN2464777Y (en) * | 2001-02-27 | 2001-12-12 | 华南理工大学 | Hydraulic-pneumatic driving device for hydraulic piling hammer |
| CN101748730A (en) * | 2009-12-15 | 2010-06-23 | 高天宝 | Multi-function closed cylinder type hydraulic piling hammer |
| CN201915406U (en) * | 2010-12-23 | 2011-08-03 | 上海工程机械厂有限公司 | Hydraulic and pneumatic combined pile hammer |
| CN202658604U (en) * | 2012-07-09 | 2013-01-09 | 高天宝 | Full-hydraulic pile hammer |
| CN203270571U (en) * | 2013-03-29 | 2013-11-06 | 郭强 | Reinforced seal-cylinder hydraulic pile hammer |
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| JPH06280262A (en) * | 1993-03-26 | 1994-10-04 | Sato Tekko Kk | Hammer device |
| CN2464777Y (en) * | 2001-02-27 | 2001-12-12 | 华南理工大学 | Hydraulic-pneumatic driving device for hydraulic piling hammer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105926620A (en) * | 2016-04-26 | 2016-09-07 | 中国海洋石油总公司 | Portable variable-diameter pile sleeve device for pile driving |
| CN106522205A (en) * | 2016-12-30 | 2017-03-22 | 上海市机械施工集团有限公司 | Pile cap |
| CN108301411A (en) * | 2018-02-14 | 2018-07-20 | 佛山市隆格自动化科技有限公司 | It is a kind of can precise elevation hydraulic hammer pile-driving method and its using this method hydraulic hammer |
| CN108375947A (en) * | 2018-05-21 | 2018-08-07 | 广东力源液压机械有限公司 | A kind of hydraulic pile hammer real-time running state monitoring method and its system |
| CN111059085A (en) * | 2019-12-26 | 2020-04-24 | 太重（天津）重型装备科技开发有限公司 | Integrated energy accumulator device for hydraulic pile hammer |
| CN112065816A (en) * | 2020-09-16 | 2020-12-11 | 中机锻压江苏股份有限公司 | Length-variable full-built-in hydraulic ramming hammer |
| CN114351705A (en) * | 2022-02-22 | 2022-04-15 | 南京工业大学 | Dual-mode portable pneumatic hammer for rapidly planting piles in breach plugging |
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| CN103215954B (en) | 2015-01-28 |
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