CN207420445U - A kind of down-the-hole air hammer - Google Patents
A kind of down-the-hole air hammer Download PDFInfo
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- CN207420445U CN207420445U CN201721282682.5U CN201721282682U CN207420445U CN 207420445 U CN207420445 U CN 207420445U CN 201721282682 U CN201721282682 U CN 201721282682U CN 207420445 U CN207420445 U CN 207420445U
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- air hammer
- wall
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- 238000000034 method Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 239000003818 cinder Substances 0.000 claims description 43
- 239000012530 fluid Substances 0.000 claims description 18
- 239000000565 sealant Substances 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 10
- 238000004891 communication Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 21
- 239000011435 rock Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Earth Drilling (AREA)
Abstract
A kind of down-the-hole air hammer disclosed in the present application, including piston, outer shell and gas distribution channels, the piston is movably arranged on the outer cylinder interior, the piston moves back and forth in the outer shell makes the gas distribution channels can alternate communication ante-chamber and back cavity, the piston outer wall at the ante-chamber is equipped with step, the outer inside wall of cylinder is embedded with bushing, and during travelling forward, the bushing makes to form closed airbag in the ante-chamber piston with step cooperation.Down-the-hole air hammer provided by the utility model, in piston outer wall, step is set, piston is during travelling forward, bushing coordinates with step sealing, the air bag of closing can be formed in ante-chamber, can impact that effectively damper piston travels forward, so as to can effectively prevent piston from carrying out " sky is beaten " in drilling process.
Description
Technical field
The utility model belongs to down-the-hole drilling tool technical field, and in particular to a kind of down-the-hole air hammer.
Background technology
Down-the-hole air hammer is used primarily in the drilling operations such as mine blasting, well perforate, and the pressure of high pressure is provided by air compressor machine
Contracting air enters impactor ante-chamber and back cavity acting, and piston is made to generate the reciprocating motion of high speed, final logical to hit drill bit afterbody
The carbide button crossed above drill bit realizes broken rock, and produced rock slag blows out bottom hole by the gases at high pressure of impactor discharge again, final real
Ready-made hole.
In drilling process, since can also there be remaining air pressure the inside of down-the-hole air hammer, piston has under remaining air pressure
When also may proceed to move back and forth several times, impacted, be known as " sky beat " in industry slang.Since drill bit has taken off in drilling process
From bottom hole, the rock stratum of bottom hole is to drill bit without support force, and piston advances forward hits drill bit, and the components such as drill bit, snap ring need to be held
By the impact force of piston whole, the damage of the parts such as drill bit, card drill sleeve and snap ring can be caused.
Therefore it provides one kind can effectively prevent the down-the-hole air hammer of generation " sky is beaten ", it is that those skilled in the art urgently solve
Certainly the technical issues of.
Utility model content
In view of the above-mentioned problems of the prior art, the purpose of this utility model is to provide a kind of down-the-hole air hammer,
Piston outer wall sets step, and during travelling forward, the step on piston can coordinate piston with seal with buss, and in ante-chamber
Form the air bag of closing, can the effectively forward impact of damper piston, so as to can effectively prevent piston from carrying out in drilling process
" sky is beaten ".
The technical scheme that the utility model is provided is as follows：
A kind of down-the-hole air hammer, including piston, outer shell and gas distribution channels, the piston is movably arranged in the outer shell
Portion, the piston moved back and forth in the outer shell make the gas distribution channels can alternate communication ante-chamber and back cavity, at the ante-chamber
The piston outer wall be equipped with step, the outer inside wall of cylinder is embedded with bushing, and the piston is described during travelling forward
Bushing makes to form closed airbag in the ante-chamber with step cooperation.
Further, the internal piston is equipped with axial passage, and the outer inside wall of cylinder is equipped with groove, is set on the piston
Have and blow cinder hole, the cinder hole that blows connects the axial passage, and during the piston motion, the cinder hole that blows can be interrupted and institute
It states and forms gas channel between the groove of the outer inside wall of cylinder.
Further, the piston includes piston leading portion, piston stage casing and piston endpiece, and the cinder hole that blows is arranged on the work
Endpiece is filled in, when the piston moves backward, the cinder hole that blows can form gas channel between the groove of the outer inside wall of cylinder.
Further, the second groove and the 3rd groove, institute are axially provided with along the piston on the piston endpiece outer wall
The second groove to be stated to connect with the 3rd groove, the width of second groove is more than the width of the 3rd groove, and described the
The length of three grooves is more than the length of second groove, it is described blow cinder hole arranged on second groove and the 3rd groove it
Between the piston on.
Further, the cinder hole that blows is inclined on the piston, makes described to blow the air stream outlet of cinder hole in air-flow
The front of entrance.
Further, at least provided with cinder hole is blown described in two, the cinder hole that blows is distributed along the piston even circumferential.
Further, the down-the-hole air hammer includes non-return valve, and the non-return valve is for inside one-way sealing rear joint
Through hole, the non-return valve include check valve body and fluid sealant, and the non-return valve body elastic is mounted in distribution seat, described inverse
Only the head of valve body is equipped with the first perforate, and the fluid sealant is fixed on the head surface of check valve body and stretches into described first
Fixed column is formed inside perforate.
Further, the first perforate inner wall is equipped with the 4th groove, and the fixed column outer wall is equipped with protrusion, the protrusion
With the 4th fit depressions, for blocking the fixed column.
Further, the non-return valve body tail section axle center is equipped with the second perforate, and spring is equipped in second perforate,
And extended second perforate of spring, the relatively described distribution seat of the compressible spring of check valve body are axially moved
Dynamic, first perforate is connected with second perforate, and the fixed column stretches into the spring inner.
Further, the diameter in the middle part of the spring is less than the diameter at both ends.
Down-the-hole air hammer provided by the utility model, piston outer wall set step, piston during travelling forward,
Step on piston can coordinate with seal with buss, ante-chamber formed closing air bag, air bag can effectively damper piston travel forward
Impact, greatly reduce impact force of the piston to drill bit, so as to can effectively prevent piston from carrying out " sky beat " in drilling process,
The components such as drill bit, bushing, snap ring can be protected from the enormous impact force of piston.
Description of the drawings
It in order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structure diagram for the down-the-hole air hammer that the utility model embodiment 1 provides；
Structure diagram when Fig. 2 is the piston advances forward for the down-the-hole air hammer that the utility model embodiment 1 provides；
Fig. 3 is another down-the-hole air hammer structure diagram that the utility model embodiment 1 provides；
Fig. 4 is the structure diagram of the non-return valve for the down-the-hole air hammer that the utility model embodiment 2 provides.
Reference sign：Piston 1；Step 101；Blow cinder hole 102；Second groove 103；3rd groove 104；Outer shell 2；It is recessed
Slot 201；Ante-chamber 3；Back cavity 4；Bushing 5；Air bag 6；Non-return valve 7；Check valve body 701；Fluid sealant 702；Fixed column 703；4th
Groove 704；Protrusion 705；Spring 706；Rear joint 8；Distribution seat 9；Drill bit 10.
Specific embodiment
It is in order to make those skilled in the art better understand the technical solutions in the application, real below in conjunction with the application
The attached drawing in example is applied, the technical solution in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
Technical staff's all other embodiments obtained without making creative work should all belong to the application protection
Scope.
Firstly the need of explanation, in present specification, using one end where drill bit on down-the-hole air hammer 10 for it is " preceding " just,
Conversely, using one end away from drill bit 10 on down-the-hole air hammer as " rear " side；Also, with check valve body 701 close to rear joint 8
The larger part in one end is the head of check valve body 701, and other end diameter is relatively small, in distribution seat 9 one
Section is the afterbody of check valve body 701." length " described herein refers to the distance along down-the-hole air hammer axial direction,
" width " refers to the distance along component circumferencial direction where it.
Embodiment 1
As shown in Figure 1 to Figure 3, a kind of down-the-hole air hammer provided in this embodiment leads to including piston 1, outer shell 2 and distribution
Road, the piston 1 are movably arranged on inside the outer shell 2, and the piston 1 moves back and forth in the outer shell 2 makes the distribution
Passage can alternate communication ante-chamber 3 and back cavity 4,1 outer wall of the piston at the ante-chamber 3 is equipped with step 101, in the outer shell 2
Wall is embedded with bushing 5, and during travelling forward, the bushing 5 makes with the step 101 cooperation described the piston 1
Ante-chamber 3 forms closed airbag 6.
The present embodiment provides a kind of down-the-hole air hammer, 1 outer wall of piston is provided with step 101, piston 1 is travelling forward
In the process, as shown in Fig. 2, the step 101 on piston 1 can be sealed with bushing 5 and coordinated, the air bag 6 of closing, gas are formed in ante-chamber 3
Capsule 6 can impact that effectively damper piston 1 travels forward, impact force of the piston 1 to drill bit 10 is greatly reduced, so as in drilling process
In can effectively prevent piston 1 from carrying out " sky beat ", make the components such as drill bit 10, bushing 5, snap ring from the enormous impact force of piston 1,
It is damaged so as to can effectively prevent it in drilling process.
Preferably, as shown in figure 3, the piston 1 is internally provided with axial passage, 2 inner wall of outer shell is equipped with groove
201, the piston 1, which is equipped with, blows cinder hole 102, and the cinder hole 102 that blows connects the axial passage, is moved through in the piston 1
Cheng Zhong, it is described blow cinder hole 102 and can be interrupted form gas channel between the groove 201 of 2 inner wall of the outer shell.
Down-the-hole air hammer provided in this embodiment, piston 1 move during, blow cinder hole 102 air flow inlet can between
The disconnected groove 201 on 2 inner wall of outer shell forms gas channel, at this point, between pressure-air is between air flow inlet and groove 201
Gap, which enters, blows cinder hole 102, and the axial passage into inside piston 1 carries out blowing slag, prevents rock slag from entering impactor from drill bit 10
Inside, and can will be blown out into the rock slag inside impactor from drill bit 10.The down-the-hole air hammer, only in 1 motion process of piston
The a certain stage carry out blowing slag, other motion stages, it is opposite with 2 inner wall of outer shell to blow the air flow inlet of cinder hole 102, so that blowing slag
The air flow inlet closing in hole 102, at this time without blowing slag.Down-the-hole air hammer blow cinder hole 102 carry out interruption blow slag, operating pressure
Reduction is smaller, and air compressor machine air consumption is small, and the oil consumption of air compressor machine is greatly saved, and is conducive to improve rate of penetration.
Wherein, the piston 1 includes piston leading portion, piston stage casing and piston endpiece, and the cinder hole 102 that blows is arranged on the work
Endpiece is filled in, when the piston 1 moves backward, the cinder hole 102 that blows can be formed between the groove 201 of 2 inner wall of outer shell
Gas channel.Since return slag occurs mainly in piston 1 during moving backward inside down-the-hole air hammer, only in work
During plug 1 moves backward, formation gas channel carries out blowing slag between blowing the groove 201 of 2 inner wall of cinder hole 102 and outer shell, blows
Slag has specific aim, can reach good and blow slag effect and cause operating pressure reduction larger, be conducive to improve drilling speed
Degree, and saved the oil consumption of air compressor machine.
Specifically, the second groove 103 and the 3rd groove are provided with along the piston 1 is axial on the piston endpiece outer wall
104, second groove 103 is connected with the 3rd groove 104, and the width of second groove 103 is recessed more than the described 3rd
The width of slot 104, the length of the 3rd groove 104 are more than the length of second groove 103, and the cinder hole 102 that blows is arranged on
On the piston 1 between second groove 103 and the 3rd groove 104.
In the present embodiment, the 3rd groove 104 is preferably adjacent with piston stage casing, blow cinder hole 102 arranged on the second groove 103 with
On piston 1 between 3rd groove 104.During piston 1 travels forward, gas distribution channels connection ante-chamber 3, but due to the 3rd groove 104
Length be more than the length of the second groove 103, it is opposite with 2 inner wall of outer shell to blow cinder hole 102, by it is closed firmly, without blowing slag；Ante-chamber
After the 3 substantial amounts of gases at high pressure of accumulation, piston 1 is promoted to move backward, ante-chamber 3 is closed, and gas distribution channels are connected with back cavity 4, and is blown
102 aperture of cinder hole and 2 inner wall upper groove of outer shell form gas channel, and gases at high pressure are from groove and blow between 102 aperture of cinder hole
Gap, into 1 internal axial channel of piston, carries out blowing slag into cinder hole 102 is blown.
Wherein, the cinder hole 102 that blows is inclined on the piston 1, makes described to blow the air stream outlet of cinder hole 102 in gas
The front of inflow entrance.It blows cinder hole 102 to be obliquely installed, be transported after entering 1 axial passage of piston convenient for gases at high pressure to 10 direction of drill bit
It is dynamic, it is more preferable to blow slag effect.
Specifically, at least provided with cinder hole 102 is blown described in two, the cinder hole 102 that blows is along 1 even circumferential of piston point
Cloth.The quantity for blowing cinder hole 102 determines according to specifically used effect, sets and multiple blows cinder hole 102 and along 1 even circumferential cloth of piston
It puts, so that it is more preferable to blow slag effect.
Embodiment 2
The present embodiment provides a kind of down-the-hole air hammer, as shown in figure 4, it is except disclosing the spy of the technology in above-described embodiment
Sign, also discloses following technical characteristic：The down-the-hole air hammer includes non-return valve 7, and the non-return valve 7 is followed by for one-way sealing
Through hole inside first 8, the non-return valve 7 include check valve body 701 and fluid sealant 702, the 701 elasticity peace of check valve body
In distribution seat 9, the head of the check valve body 701 is equipped with the first perforate, and the fluid sealant 702 is fixed on non-return valve master
The head surface of body 701 simultaneously stretches into formation fixed column 703 inside first perforate.
Down-the-hole air hammer provided in this embodiment, the head of check valve body 701 offer the first perforate, fluid sealant
702 are fixed on 701 head surface of check valve body, and fluid sealant 702 also forms fixed column 703 inside the first perforate, Gu
Fixed column 703 is fixed in the first perforate, and adds the contact area of fluid sealant 702 and check valve body 701, fluid sealant 702
It is reliable with 701 fixation of check valve body, prevent fluid sealant 702 from coming off on check valve body 701 so as to effective solution.
Also, fluid sealant 702 has good globality with check valve body 701, and sealing effect is good, and fluid sealant 702 is more wear-resisting resistance to
With being not easy to be destroyed.Wherein, the first perforate is the axial aperture of 701 axial location of check valve body, the injection of fluid sealant 702 the
Fixed column 703 is formed in one perforate, fixed column 703 and the fluid sealant 702 of 701 head surface of check valve body are integrally formed.
Preferably, the first perforate inner wall is equipped with the 4th groove 704, and 703 outer wall of fixed column is equipped with protrusion 705,
Described raised 705 are engaged with the 4th groove 704, for blocking the fixed column 703.The 4th of first perforate inner wall is recessed
Slot 704 is the annular groove along the first perforate circumference, and the protrusion 705 of 703 outer wall of fixed column is stuck in the 4th of the first perforate inner wall the
In groove 704, make that fluid sealant 702 and the connection of check valve body 701 are more solid and reliable, and fluid sealant 702 is not easy from non-return valve
It comes off in main body 701.
More optimize, the afterbody axle center of the check valve body 701 is equipped with the second perforate, is equipped in second perforate
Spring 706, and extended second perforate of the spring 706, compressible 706 phase of spring of check valve body 701
The distribution seat 9 is moved axially, first perforate is connected with second perforate, and the fixed column 703 stretches into the bullet
Inside spring 706.
Spring 706 stretches out the second perforate and is contacted with distribution seat 9, and gases at high pressure enter from 8 internal cavity of rear joint, and rush
701 head of check valve body is hit, makes non-return valve 7 whole to down-the-hole air hammer forward, compresses 701 afterbody of check valve body
Spring 706 makes gases at high pressure unidirectionally by the way that when stopping supplying gases at high pressure, gases at high pressure cannot be back at non-return valve 7
Passage inside rear joint 8.First perforate is connected with the second perforate, can form a through hole, and the second perforate is directly more than the
The diameter of one perforate, one end of spring 706 is located in the second perforate, and is stuck in the position that the second perforate connects with the first perforate,
Fixed column 703 is stretched into from the first perforate inside the spring 706 in the second perforate, is conducive to support spring 706, prevents spring 706
Radially bending or deformation occur in telescopic process.
Wherein, the diameter at 706 middle part of spring is less than the diameter at both ends.In the prior art, spring 706 is cylindrical
, the diameter of spring 706 everywhere is equal, spring 706 during the work time may because occurring smaller bending, and with it is inverse
Only valve 7 and distribution seat 9 generate CONTACT WITH FRICTION, so that spring 706 is abraded, worn, and spring 706 are made early fracture mistake occur
Effect.In the present embodiment, the spring 706 of use, mid diameter is small compared with the diameter at both ends, therefore 706 middle part of spring is away from non-return valve 7
It is distant with 9 inner wall of distribution seat, therefore, even if flexural deformation slightly occurs for spring 706, will not with non-return valve 7 and
The inner wall of distribution seat 9 is in contact, and along with the support of fixed column 703, spring 706 is not susceptible to flexural deformation, so as to effective
Spring 706 is protected, extends the service life of spring 706.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications of these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (10)
1. a kind of down-the-hole air hammer, which is characterized in that including piston (1), outer shell (2) and gas distribution channels, piston (1) activity
Internal mounted on the outer shell (2), the piston (1) moves back and forth in the outer shell (2) makes the gas distribution channels that can replace
Connect ante-chamber (3) and back cavity (4), the piston (1) outer wall at the ante-chamber (3) is equipped with step (101), the outer shell (2)
Inner wall is embedded with bushing (5), and the piston (1) during travelling forward, with the step (101) match somebody with somebody by the bushing (5)
Conjunction makes to form closed airbag (6) in the ante-chamber (3).
2. down-the-hole air hammer according to claim 1, which is characterized in that the piston (1) is internally provided with axial passage, institute
Outer shell (2) inner wall is stated equipped with groove (201), the piston (1), which is equipped with, blows cinder hole (102), described to blow cinder hole (102) connection
The axial passage, in the piston (1) motion process, the cinder hole (102) that blows can be interrupted and the outer shell (2) inner wall
Groove forms gas channel between (201).
3. down-the-hole air hammer according to claim 2, which is characterized in that the piston (1) is included in piston leading portion, piston
Section and piston endpiece, the cinder hole (102) that blows are described to blow slag when the piston (1) moves backward arranged on the piston endpiece
Hole (102) can form gas channel between the groove (201) of the outer shell (2) inner wall.
4. down-the-hole air hammer according to claim 3, which is characterized in that along the piston on the piston endpiece outer wall
(1) it is axial to be provided with the second groove (103) and the 3rd groove (104), second groove (103) and the 3rd groove
(104) connect, the width of second groove (103) is more than the width of the 3rd groove (104), the 3rd groove
(104) length be more than second groove (103) length, it is described blow cinder hole (102) arranged on second groove (103) with
On the piston (1) between 3rd groove (104).
5. down-the-hole air hammer according to claim 2, which is characterized in that it is described blow cinder hole (102) be inclined at it is described
On piston (1), make described to blow the air stream outlet of cinder hole (102) in the front of air flow inlet.
6. down-the-hole air hammer according to claim 2, which is characterized in that at least provided with blowing cinder hole (102), institute described in two
It states and blows cinder hole (102) along the distribution of the piston (1) even circumferential.
7. down-the-hole air hammer according to claim 1, which is characterized in that the down-the-hole air hammer includes non-return valve (7), institute
Non-return valve (7) is stated for the internal through hole of one-way sealing rear joint (8), the non-return valve (7) include check valve body (701) and
Fluid sealant (702), the check valve body (701) are resiliently mounted in distribution seat (9), the head of the check valve body (701)
Portion is equipped with the first perforate, and the fluid sealant (702) is fixed on the head surface of check valve body (701) and stretches into described first and opens
Fixed column (703) is formed inside hole.
8. down-the-hole air hammer according to claim 7, which is characterized in that the first perforate inner wall is equipped with the 4th groove
(704), fixed column (703) outer wall is equipped with raised (705), and the protrusion (705) matches with the 4th groove (704)
It closes, for blocking the fixed column (703).
9. down-the-hole air hammer according to claim 7, which is characterized in that check valve body (701) the afterbody axle center is set
There is the second perforate, spring (706), and extended second perforate of the spring (706), institute are installed in second perforate
State the distribution seat (9) axial movement relatively of the compressible spring (706) of check valve body (701), first perforate and
The second perforate connection, it is internal that the fixed column (703) stretches into the spring (706).
10. down-the-hole air hammer according to claim 9, which is characterized in that the diameter in the middle part of the spring (706) is less than two
The diameter at end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721282682.5U CN207420445U (en) | 2017-09-30 | 2017-09-30 | A kind of down-the-hole air hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721282682.5U CN207420445U (en) | 2017-09-30 | 2017-09-30 | A kind of down-the-hole air hammer |
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| Publication Number | Publication Date |
|---|---|
| CN207420445U true CN207420445U (en) | 2018-05-29 |
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ID=62313346
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721282682.5U Active CN207420445U (en) | 2017-09-30 | 2017-09-30 | A kind of down-the-hole air hammer |
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| Country | Link |
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| CN (1) | CN207420445U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273445A (en) * | 2019-02-17 | 2019-09-24 | 南平市建阳区汽车锻压件厂 | Underground cross-drilled hole construction equipment and underground cross-drilled hole construction method |
| CN111827881A (en) * | 2020-07-31 | 2020-10-27 | 长江大学 | Reciprocating peristaltic drillless drilling rig |
-
2017
- 2017-09-30 CN CN201721282682.5U patent/CN207420445U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273445A (en) * | 2019-02-17 | 2019-09-24 | 南平市建阳区汽车锻压件厂 | Underground cross-drilled hole construction equipment and underground cross-drilled hole construction method |
| CN110273445B (en) * | 2019-02-17 | 2021-10-08 | 南平市建阳区汽车锻压件厂 | Underground cross bore construction method |
| CN111827881A (en) * | 2020-07-31 | 2020-10-27 | 长江大学 | Reciprocating peristaltic drillless drilling rig |
| CN111827881B (en) * | 2020-07-31 | 2022-05-27 | 长江大学 | Reciprocating peristaltic drillless drilling rig |
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Denomination of utility model: Down-hole hammer piston and machining process thereof Effective date of registration: 20191205 Granted publication date: 20180529 Pledgee: Bank of Communications Co.,Ltd. Hunan Branch Pledgor: CHANGSHA HEIJINGANG INDUSTRIAL Co.,Ltd. Registration number: Y2019980000872 |
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Denomination of utility model: A down-the-hole impactor Effective date of registration: 20221229 Granted publication date: 20180529 Pledgee: Bank of Communications Co.,Ltd. Hunan Branch Pledgor: CHANGSHA HEIJINGANG INDUSTRIAL Co.,Ltd. Registration number: Y2022980029683 |
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