CN104775469A - Multifunctional crushing head - Google Patents
Multifunctional crushing head Download PDFInfo
- Publication number
- CN104775469A CN104775469A CN201510103744.0A CN201510103744A CN104775469A CN 104775469 A CN104775469 A CN 104775469A CN 201510103744 A CN201510103744 A CN 201510103744A CN 104775469 A CN104775469 A CN 104775469A
- Authority
- CN
- China
- Prior art keywords
- piston rod
- crushing head
- cylinder
- hammer plate
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Earth Drilling (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
The invention provides a multifunctional crushing head. The multifunctional crushing head comprises a hopper (1), a power cabin at the upper part of the hopper (1), a hammer plate (19) arranged at the lower part of the power cabin, and a drill bit (3) which is mounted under the hammer plate (19) through a drill rod (2); the power cabin comprises an oil cylinder (15) in the middle and air cylinders (8) on the two sides. The multifunctional crushing head is characterized in that a piston rod (16) of the oil cylinder (15) is in a pipe shape structure; a rapid oil returning valve is arranged on the piston rod (16); the lower end of the piston rod (16) is fixedly connected with the hammer plate (19); the piston rod (16) and the hammer plate (19) are internally provided with control mechanisms for pushing the rapid oil returning valve to be opened and closed. The multifunctional crushing head has large impact force and high energy utilization rate; the drill bit can do reciprocating motion for 180 times each minute and the working efficiency is high; the multifunctional crushing head also can be used as an excavator bucket and is used for cleaning a crushed hard layer.
Description
Technical field
Multifunctional crushing head, belongs to the design and manufaction technical field of development machine handpiece apparatus, is specifically related to a kind of multi-functional crushing head.
Background technology
Before the work such as exploitation, tunnel excavation, frozen soil in cold region layer excavation carrying out earth and rock works, various mining industry, the problem of hard formation must be solved.Use traditional explosive blasting, have to pass through shut-downs, evacuation personnel before setting up explosives magazine, open circuit, boring, cloth medicine, some big gun, arrange a series of activities such as warning line after could explosion, fried not broken also will separate the entrucking of big gun a series of technique ability.Such production operation production efficiency is not high, and safety also can not get ensureing.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provides that a kind of impact force is large, capacity usage ratio is high, the much higher function crushing head of operating efficiency.
The technical solution adopted for the present invention to solve the technical problems is: this Multifunctional crushing head, comprise bucket, the bucket power bin on top, the hammer plate of power bin bottom and be arranged on the bore bit below hammer plate by drill steel, power bin comprises the oil cylinder at middle part and the cylinder of both sides, it is characterized in that: the piston rod of described oil cylinder is tubular structure, and piston rod is provided with rapid oil return valve; Described piston-rod lower end is fixedly connected with hammer plate, is provided with the controlling organization that promotion rapid oil return valve opens and closes in piston rod and in hammer plate.
Preferably, described rapid oil return valve comprises the valve rod in the oil return opening in piston rod, point oilhole on piston rod and piston rod, the piston bush of oil cylinder is outside piston rod, piston rod is divided into upper piston rod and lower piston rod, oil return opening is located between upper piston rod and lower piston rod, point oilhole is located at upper piston rod and lower piston rod respectively near one end of oil return opening, and valve rod can slide up and down and is arranged in lower piston rod.
Preferably, described oil cylinder top is provided with the stroke regulating lever of the regulating piston throw of lever.
Preferably, described controlling organization comprises the push rod be arranged in upper piston rod and the elastomeric element be arranged in the middle part of hammer plate, and be provided with installing hole in the middle part of hammer plate, elastomeric element is arranged in installing hole, promote valve rod to be closed by oil return opening, push rod promotes valve rod and is opened by oil return opening.
Preferably, described elastomeric element is air spring.
Preferably, described cylinder top all has pressure balance interface, and the pressure balance interface of two cylinders is connected by pressure-resistant pipeline.
Preferably, the cylinder piston lower end of described cylinder is fixedly connected with hammer plate by push rod.
Preferably, described bucket bottom is provided with the plate that breaks ground, and the plate that breaks ground has vertical through hole, drill steel upper end be fixed on hammer plate on, lower end through through hole and bore bit hinged.
Preferably, described drill steel and break ground between plate and be provided with damping spring.
Preferably, described bucket is cast by alloy steel and is formed.
Compared with prior art, the beneficial effect that Multifunctional crushing head of the present invention has is:
In the piston rod of 1, Multifunctional crushing hair oil cylinder, rapid oil return valve is installed, the hydraulic oil in oil cylinder inner carrier lower cavity can be made to flow rapidly to upper chamber, solve the problem that the discharge of in-oil cylinder hydraulic oil weakens the impact force that cylinder produces not in time, drastically increase capacity usage ratio, increase the impact force that crushing head produces, improve the operating efficiency of crushing head; Controlling organization makes rapid oil return valve along with move up and down cut out automatically and the unlatching of piston rod, enables bore bit realize the reciprocating motion of 180 times per minute.
2, oil cylinder top is provided with stroke regulating lever, can regulate the stroke of the piston rod of oil cylinder, thus the size of the impact force of adjustment cylinder generation.
3, the pressure balance interface on cylinder top is connected by pressure-resistant pipeline, and make the pressure in each cylinder equal, the impact force of generation is equal, offsets, improve operating accuracy when avoiding crushing head work.
4, cylinder piston is connected with hammer plate by push rod, and the piston rod of cylinder piston and oil cylinder is synchronized with the movement, and ensure that bore bit moves back and forth the impact force of generation identical at every turn, improves the stability of crushing head work.
5, drill steel through the through hole broken ground on plate and bore bit hinged, the impact force that cylinder is produced all is delivered on bore bit along drill steel, avoids that the axis of drill steel and cylinder piston is not parallel causes energy loss.
6, drill steel and the plate that breaks ground directly are provided with damping spring, produce larger vibrations when crushing head can be avoided to work, and can compress again, increase the impact force of bore bit when hammering plate into shape and rising.
Accompanying drawing explanation
Fig. 1 is that schematic diagram is looked on a left side for Multifunctional crushing head.
Fig. 2 is the cross-sectional schematic in A-A direction in Fig. 1.
In figure: 1, bucket 2, drill steel 3, bore bit 4, stroke regulating lever 5, push rod 6, oil-in 7, cylinder piston 8, cylinder 9, cylinder top cover 10, inflation air nozzle 11, pressure balance interface 12, oil-out 13, push rod 14, piston 15, oil cylinder 16, piston rod 17, valve rod 18, air spring 19, hammer plate 20, the plate 21 that breaks ground, gland 22, oil return opening 23, point oilhole.
Detailed description of the invention
Fig. 1 ~ 2 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 2, the present invention will be further described.
A kind of Multifunctional crushing head, comprises bucket 1, the power bin on 1 top of struggling against, the hammer plate 19 of power bin bottom and be arranged on the bore bit 3 below hammer plate 19 by drill steel 2, and power bin comprises the oil cylinder 15 at middle part and the cylinder 8 of both sides.The piston rod 16 of oil cylinder 15 is tubular structure, and piston rod 16 is provided with rapid oil return valve.Piston rod 16 lower end is fixedly connected with hammer plate 19, is provided with the controlling organization that promotion rapid oil return valve opens and closes in piston rod 16 and in hammer plate 19.Rapid oil return valve can make the hydraulic oil in oil cylinder 15 inner carrier lower cavity flow rapidly to upper chamber, the hydraulic oil discharge solved in oil cylinder 15 weakens the problem of the impact force that cylinder 8 produces not in time, drastically increase capacity usage ratio, increase the impact force that crushing head produces, improve the operating efficiency of crushing head; Controlling organization makes rapid oil return valve along with move up and down cut out automatically and the unlatching of piston rod 16, makes bore bit 3 can realize the reciprocating motion of 180 times per minute.
Concrete: as shown in Figure 1 and 2: the bucket 1 of Multifunctional crushing head is anterior and that bottom is uncovered housing, and the top of bucket 1 is provided with the earrings for being arranged on development machine or digger arm.Bucket 1 is cast by alloy steel and is formed.Bucket 1, both as the installation assembly of Multifunctional crushing head, can be used as bucket again, the hard formation after cleaning fragmentation.
The top of bucket 1 is power bin, and power bin comprises the oil cylinder 15 at middle part and the cylinder 8 of both sides, and oil cylinder 15 and cylinder 8 are all vertically fixed on bucket 1.Oil cylinder 15 Main Function be drive hammer plate 19 move upward and compression cylinder 8 in gas; The effect of cylinder 8 produces impact force.
The piston rod 16 of oil cylinder 15 is tubulose, piston rod 16 is provided with rapid oil return valve, rapid oil return valve can make the hydraulic oil in oil cylinder 15 inner carrier lower cavity flow rapidly to upper chamber, and the hydraulic oil discharge solved in oil cylinder 15 weakens the problem of the impact force that cylinder 8 produces not in time.Piston rod 16 lower end adopts steel ball to be connected and fixed with hammer plate 19, the controlling organization promoting rapid oil return valve opening and closing is provided with in piston rod 16 and in hammer plate 19, controlling organization makes rapid oil return valve along with move up and down cut out automatically and the unlatching of piston rod 16, makes bore bit 3 can realize the reciprocating motion of 180 times per minute.
The valve rod 17 that rapid oil return valve comprises the oil return opening 22 in piston rod 16, point oilhole 23 on piston rod 16 and is arranged in piston rod 16.The piston 14 of oil cylinder 15 is enclosed within outside piston rod 16, piston rod 16 is divided into upper piston rod and lower piston rod, oil return opening 22 is between upper piston rod and lower piston rod, and upper piston rod and lower piston rod evenly have multiple point oilhole 23 diametrically respectively in the one end near oil return opening 22; Hydraulic oil in oil cylinder 15 inner carrier 14 cavity of resorption flows rapidly in piston 14 upper chamber after flowing through point oilhole 23 on point oilhole 23, oil return opening 22 and the upper piston rod on lower piston rod successively, the hydraulic oil discharge solved in oil cylinder 15 weakens the problem of the impact force that cylinder 8 produces not in time, drastically increases capacity usage ratio.Valve rod 17 can slide up and down and is arranged in lower piston rod, and valve rod 17 is mainly used in controlling opening and closedown of oil return opening 22.
Controlling organization comprises the push rod 13 be arranged in upper piston rod and the elastomeric element be arranged in the middle part of hammer plate 19.Push rod 13 can slide up and down and is arranged in upper piston rod inner chamber, and push rod 13 upper end is stretched out, and when piston rod 16 moves upward to stroke top dead center, push rod 13 promotes valve rod 17 and opened by oil return opening 22.Installing hole is had in the middle part of hammer plate 19, elastomeric element is arranged in installing hole, when piston rod 16 moves from bottom of stroke to stroke top dead center, elastomeric element promotes valve rod 17 and is closed by oil return opening 22, make piston rod 16 drive hammer plate 19 move upward, by hammer plate 19 lift and compression cylinder 8 in gas.Elastomeric element is air spring 18.Elastomeric element can also be helical spring.
Oil cylinder 15 top is provided with the stroke regulating lever 4 of regulating piston bar 16 stroke, and stroke regulating lever 4 is threaded connection and is fixed on oil cylinder 15, and the effect of stroke regulating lever 4 is the sizes of the impact force that the stroke of regulating piston bar 16 produces with adjusting cylinders 8, easy to adjust.
The right upper portion of oil cylinder 15 is provided with oil-out 12, and the effect of oil-out 12 makes the hydraulic oil in oil cylinder 15 cavity be back in fuel tank; The left lower of oil cylinder 15 is provided with oil-in 6, the effect of oil-in 6 be make hydraulic oil enter into oil cylinder 15 cavity in and promote piston rod 16 and rise.
The left and right sides of oil cylinder 15 is fixed with a cylinder 8 respectively, and cylinder 8 is nitrogen cylinder.The cylinder top cover 9 of two cylinders 8 is respectively equipped with a qi of chong channel ascending adversely air nozzle 10, inflation air nozzle 10 is mainly used in adding nitrogen to the inner chamber of cylinder 8.Two cylinder top covers 9 have a pressure balance interface 11, and be connected by pressure-resistant pipeline, make the pressure in two cylinders 8 identical, the impact force of generation is equal, offsets, improve operating accuracy when avoiding crushing head work.
Cylinder piston 7 bottom of cylinder 8 has centre bore, and it is interior and fixing that push rod 5 top puts in centre bore; Hammer plate 19 top has hole, and the lower end of push rod 5 to put in the hole in and fixes.Cylinder piston 7 is fixedly connected with by push rod 5 with hammer plate 19, and the piston rod 16 of cylinder piston 7 and oil cylinder 15 is synchronized with the movement, and ensure that bore bit 3 moves back and forth the impact force produced identical at every turn, improves the stability of crushing head work.
The bottom of bucket 1 is provided with the plate 20 that breaks ground, and the plate 20 that breaks ground evenly has three vertical through holes.The upper end of drill steel 2 is fixedly connected with hammer plate 19, lower end is through the through hole broken ground on plate 20 and stretch out, bore bit 3 is hinged on the lower end of drill steel 2, the impact force that cylinder 8 is produced all is delivered on bore bit 3 along drill steel 2, avoids drill steel 2 and causes energy loss with the axis of cylinder piston 7 is not parallel.
Drill steel 2 and break ground between plate 20 and be provided with damping spring, damping spring is fixed by gland 21.Produce larger vibrations when damping spring can avoid crushing head to work, can compress when hammering plate 19 into shape and rising again, increase the impact force of bore bit 3.
During use, Multifunctional crushing head is arranged on development machine or digger arm by the earrings on top, and oil-in 6 is connected with a point oil distributing pipe for development machine or excavator, and oil-out 12 is connected with fuel tank.Multifunctional crushing head can be used for broken hard formation, can also be used as bucket, clear up the hard formation after fragmentation.
During work, point oil distributing pipe of development machine or excavator is by hydraulic oil by oil pipe supply oil cylinder 15 lift piston rod 16, and piston rod 16 drives hammer plate 19 to rise, and the nitrogen in compression cylinder 8.When the piston rod 16 of oil cylinder 15 rises to impulse stroke top dead centre, due to the support of stroke regulating lever 4, the stop motion of push rod 13 valve push rod 17, and piston rod 16 continues to move upward, oil return opening 22 is opened, hydraulic oil in piston 14 lower cavity of oil cylinder 15 flows rapidly in upper chamber through a point oilhole 23, oil return opening 22, and the nitrogen simultaneously compressed in cylinder 8 promotes cylinder piston 7 and drives hammer plate 19 to produce high impact forces and sharp downward movement, carries out impact grinding by bore bit 3 pairs of hard formations.After having worked, oil return opening 22 is closed by valve rod 17 under the effect of air spring 18, and under the effect of hydraulic oil, piston rod 16 drives hammer plate 19 to move upward, make hammer plate 19 again rise and compression cylinder 8 in nitrogen, to complete next time to the fragmentation work of hard formation.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a Multifunctional crushing head, comprise bucket (1), the bucket power bin on (1) top, the hammer plate (19) of power bin bottom and be arranged on the bore bit (3) of hammer plate (19) below by drill steel (2), power bin comprises the oil cylinder (15) at middle part and the cylinder (8) of both sides, it is characterized in that: the piston rod (16) of described oil cylinder (15) is tubular structure, and piston rod (16) is provided with rapid oil return valve; Described piston rod (16) lower end is fixedly connected with hammer plate (19), is provided with the controlling organization promoting rapid oil return valve and open and close in piston rod (16) and in hammer plate (19).
2. Multifunctional crushing head according to claim 1, it is characterized in that: described rapid oil return valve comprises the oil return opening (22) in piston rod (16), point oilhole (23) on piston rod (16) and the valve rod (17) in piston rod (16), the piston (14) of oil cylinder (15) is enclosed within piston rod (16) outward, piston rod (16) is divided into upper piston rod and lower piston rod, oil return opening (22) is located between upper piston rod and lower piston rod, point oilhole (23) is located at upper piston rod and lower piston rod one end near oil return opening (22) respectively, valve rod (17) can slide up and down and is arranged in lower piston rod.
3. Multifunctional crushing head according to claim 1 and 2, is characterized in that: described oil cylinder (15) top is provided with the stroke regulating lever (4) of regulating piston bar (16) stroke.
4. Multifunctional crushing head according to claim 1, it is characterized in that: described controlling organization comprises the push rod (13) be arranged in upper piston rod and the elastomeric element being arranged on hammer plate (19) middle part, hammer plate (19) middle part is provided with installing hole, elastomeric element is arranged in installing hole, promote valve rod (17) to be closed by oil return opening (22), push rod (13) promotes valve rod (17) and is opened by oil return opening (22).
5. Multifunctional crushing head according to claim 4, is characterized in that: described elastomeric element is air spring (18).
6. Multifunctional crushing head according to claim 1, is characterized in that: described cylinder (8) top all has pressure balance interface (11), and the pressure balance interface (11) of two cylinders (8) is connected by pressure-resistant pipeline.
7. Multifunctional crushing head according to claim 1, is characterized in that: cylinder piston (7) lower end of described cylinder (8) is fixedly connected with hammer plate (19) by push rod (5).
8. Multifunctional crushing head according to claim 1, it is characterized in that: described bucket (1) bottom is provided with the plate that breaks ground (20), break ground on plate (20) and have vertical through hole, drill steel (2) upper end is fixed on hammer plate (19), lower end through through hole and bore bit (3) hinged.
9. Multifunctional crushing head according to claim 8, is characterized in that: be provided with damping spring between described drill steel (2) and the plate that breaks ground (20).
10. the Multifunctional crushing head according to claim 1 or 8, is characterized in that: described bucket (1) is cast by alloy steel and formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510103744.0A CN104775469B (en) | 2015-03-10 | 2015-03-10 | Multifunctional crushing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510103744.0A CN104775469B (en) | 2015-03-10 | 2015-03-10 | Multifunctional crushing head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104775469A true CN104775469A (en) | 2015-07-15 |
| CN104775469B CN104775469B (en) | 2017-06-20 |
Family
ID=53617207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510103744.0A Expired - Fee Related CN104775469B (en) | 2015-03-10 | 2015-03-10 | Multifunctional crushing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104775469B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252352A (en) * | 2018-03-17 | 2018-07-06 | 何冬 | The more drill steel housing percussion devices of damping type |
| CN110374620A (en) * | 2019-08-25 | 2019-10-25 | 贵州大学 | The exploitation of mining heading equipment is crushed header structure |
| CN113294167A (en) * | 2021-06-15 | 2021-08-24 | 安徽瑞升机械制造有限公司 | Double-power hammer gravity tunneling machine head |
| RU2812320C1 (en) * | 2023-07-14 | 2024-01-29 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Забайкальский государственный университет" (ФГБОУ ВО "ЗабГУ") | Impact ripper |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2018583C1 (en) * | 1990-07-02 | 1994-08-30 | Глебов Вадим Дмитриевич | Hoisting-percussive ripper |
| CN101688435A (en) * | 2008-06-25 | 2010-03-31 | 金载睦 | Hydraulic breaker assembly |
| CN201695430U (en) * | 2010-06-29 | 2011-01-05 | 叶建强 | Frozen soil crusher head |
| CN103046607A (en) * | 2012-12-25 | 2013-04-17 | 三一重机有限公司 | Engineering machine, rapid oil return control system and rapid oil return control method |
| CN203905077U (en) * | 2014-06-18 | 2014-10-29 | 叶建强 | Breaking machine head with high impact force |
| CN204570777U (en) * | 2015-03-10 | 2015-08-19 | 淄博海伦机械制造有限公司 | Multifunctional crushing head |
-
2015
- 2015-03-10 CN CN201510103744.0A patent/CN104775469B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2018583C1 (en) * | 1990-07-02 | 1994-08-30 | Глебов Вадим Дмитриевич | Hoisting-percussive ripper |
| CN101688435A (en) * | 2008-06-25 | 2010-03-31 | 金载睦 | Hydraulic breaker assembly |
| CN201695430U (en) * | 2010-06-29 | 2011-01-05 | 叶建强 | Frozen soil crusher head |
| CN103046607A (en) * | 2012-12-25 | 2013-04-17 | 三一重机有限公司 | Engineering machine, rapid oil return control system and rapid oil return control method |
| CN203905077U (en) * | 2014-06-18 | 2014-10-29 | 叶建强 | Breaking machine head with high impact force |
| CN204570777U (en) * | 2015-03-10 | 2015-08-19 | 淄博海伦机械制造有限公司 | Multifunctional crushing head |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252352A (en) * | 2018-03-17 | 2018-07-06 | 何冬 | The more drill steel housing percussion devices of damping type |
| CN110374620A (en) * | 2019-08-25 | 2019-10-25 | 贵州大学 | The exploitation of mining heading equipment is crushed header structure |
| CN113294167A (en) * | 2021-06-15 | 2021-08-24 | 安徽瑞升机械制造有限公司 | Double-power hammer gravity tunneling machine head |
| CN113294167B (en) * | 2021-06-15 | 2023-10-27 | 安徽瑞升机械制造有限公司 | Gravity tunneling machine head with double power hammers |
| RU2812320C1 (en) * | 2023-07-14 | 2024-01-29 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Забайкальский государственный университет" (ФГБОУ ВО "ЗабГУ") | Impact ripper |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104775469B (en) | 2017-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204570777U (en) | Multifunctional crushing head | |
| CN104612200B (en) | Multifunction heading machine | |
| CN104775469A (en) | Multifunctional crushing head | |
| CN203905077U (en) | Breaking machine head with high impact force | |
| CN106194172A (en) | Centre-of-gravity breaks rock machine | |
| CN108590507A (en) | It is a kind of to have hammer stem back and forth from the broken rock of impact structure speed-raising tool | |
| CN103806482A (en) | Auxiliary power energy-saving device of excavator | |
| CN205259935U (en) | Drill bit is dug soon to impacted style | |
| CN202882751U (en) | Improved rock drill hydraulic system based on excavator hydraulic system | |
| CN106089197A (en) | A kind of rock breaking method utilizing brokenly rock machine | |
| CN208347673U (en) | It is a kind of back and forth to raise speed tool from the broken rock of impact structure with hammer stem | |
| CN103046600A (en) | A lubricating apparatus for contact piston of hydraulic breaker | |
| CN104389515B (en) | A kind of hydraulic drill rig jump bit | |
| KR101420696B1 (en) | Crushing blow You work excavators to boost pressure | |
| KR101183445B1 (en) | Excavating head having large-diameter hydraulic hammer and excavating method using the same | |
| CN204570776U (en) | Multifunction heading machine | |
| CN209011744U (en) | A kind of down-hole hammer equipment and its impact guidance system | |
| US4190202A (en) | High pressure pulsed water jet | |
| CN201695430U (en) | Frozen soil crusher head | |
| KR101337974B1 (en) | Complex Hammer air displacement volume controlled | |
| CN211898652U (en) | Breaking hammer with auxiliary stone breaking function | |
| CN111520076B (en) | High-voltage pulse energy-gathering jet flow generation system and use method thereof | |
| CN211285764U (en) | Pneumatic breaking hammer | |
| KR101575059B1 (en) | Spring and compressed gas type breaker | |
| KR101595245B1 (en) | Spring and cam-driven type breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170620 |