CN201857895U - Single large-diameter pneumatic DTH (down the hole) hammer - Google Patents
Single large-diameter pneumatic DTH (down the hole) hammer Download PDFInfo
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- CN201857895U CN201857895U CN2010205648677U CN201020564867U CN201857895U CN 201857895 U CN201857895 U CN 201857895U CN 2010205648677 U CN2010205648677 U CN 2010205648677U CN 201020564867 U CN201020564867 U CN 201020564867U CN 201857895 U CN201857895 U CN 201857895U
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Abstract
The utility model relates to a single large-diameter pneumatic DTH hammer. The single large-diameter pneumatic DTH hammer comprises a drill bit, a spline shaft, a spline sleeve, a cylinder body, an air-distribution sleeve, a bushing, an upper flange, an intermediate flange, a piston and a central air pipe, which are coaxially arranged and connected with each other; the central air pipe is a double-core pipe and is installed in a piston inner hole; an air guide ring groove is arranged between an outer core pipe and an inner core pipe of the double-core pipe; an injection hole communicated with the inner core pipe is arranged on the spline shaft connected with the drill bit; an exhaust check valve is arranged at an inlet of the injection hole; an exhaust passage and an intake passage are arranged in the intermediate flange respectively; and an exhaust throttle valve is arranged in the exhaust passage. The pneumatic DTH hammer can achieve good airlifting reverse circulation slag absorbing and removing effects, and the abrasion of internal moving parts caused by mud recharging can be effectively avoided. The pneumatic DTH hammer has the advantages of compact and reasonable structure, light weight, low manufacturing cost, convenience in assembly and maintenance and high working efficiency.
Description
Technical field
The utility model relates to a kind of twin-core pipe monomer major diameter pneumatic down-hole hammer, and this down-the-hole hammer is fit to all kinds of rotary drilling rigs and carries out bore operation at bad ground, firm hard formation as the drilling tool that spins of large diameter bored pile construction.
Background technology
Rotary drilling rig carries out the high-efficiency high-quality pore-forming operation technique that bored pile construction is present builing industry widespread, but the conventional drilling tool that rotary drilling rig adopted runs into big difficulty in the hard formation construction.Modern high-rise building, high ferro and bridge on highway basis all require bored pile to embed basement rock, to improve supporting capacity and anti-disaster ability, make it reach longer service life, and in addition, the pore-forming operation is also often bored and met hard rock when coastal area, mountain construction.For making rotary drilling rig have the hard formation construction ability, implemented multiple measure, as adopt the rock tube to bore, inlay pick drilling bucket, combination rock bit etc., such scheme all is broken rock means with rotary cutting, strengthened construction ability to hard formation, but that its deficiency is an efficient is low, tool wear is fast, and it is quite slow to surpass the gentle breeze rock stratum drilling depth of 120MPa in compressive strength, even can't creep into.
Patent CN2066480U once provided a kind of wet type closed form the anti-pneumatic down-hole hammer that circulates, be to adopt impact rotating to carry out hard-rock boring in conjunction with the technology of anti-circulation deslagging, can obtain higher efficient in the hard rock area, but the deficiency of its existence is: the exhaust passage of adopting double-deck outer cylinder sheath structure, to making the structure heaviness, difficulty of processing is big, cost is high; Only adopt pump to inhale anti-endless form deslagging, strict to the drilling tool sealing effectiveness, easily stop up; Mud easily enters cylinder body by the slit and causes piston sharply to wear and tear, and drill bit structure is without optimization, and underflow field, hole is unfavorable for slag absorbing.
Direct circulation that patent KR2005011865A, KR20060096240A proposed or the anti-combined type down-the-hole hammer that circulates, adopted the local circulation mode, drilling tool is provided with collection slag tube, rock slag bits need be collected in the collection slag tube during operation, then carry to face of land slag dumping, drilling efficiency is low, also easily causes the distribution sebific duct to damage because of frequently making a trip; This external cause combination hammer air consumption is big, and each is hammered duty into shape and is difficult for equilibrium, the whole rock breaking efficiency that impacts of influence; Because combination hammer top has increased collection slag tube, the drilling tool whole height increases considerably, dismounting inconvenience on rotary drilling rig.Combination hammer and collection slag tube gross weight were bigger after each round trip crept into and finishes, and rotary drilling rig master winch hoisting power is required height.
Summary of the invention
The purpose of this utility model is for overcoming the deficiency of above-mentioned technology, a kind of monomer major diameter pneumatic down-hole hammer being provided, and with the supporting application of rotary drilling rig, realizes that hard formation spins efficiently to creep into.
The purpose of this utility model realizes by following scheme:
Described monomer major diameter pneumatic down-hole hammer, comprise the spiral-flow type drill bit, splined shaft, spline housing, cylinder block, the distribution cover, lining, upper flange, counter flange, piston and center tracheae, above-mentioned parts are coaxial arrangement successively, tie with damping check bolt set associative the outside, axial location is carried out by the end face contact and with spacer in inside, the center tracheae is installed in piston inner hole, described cylinder block is a single cylinder, and the center tracheae is the twin-core pipe, form by inner core tube and outer core pipe, wherein inner core tube is plugged on the inside of outer core pipe, offers the air guide annular groove between outer core pipe orifice and the inner core tube; The splined shaft that links to each other with the spiral-flow type drill bit is provided with the perforation that communicates with inner core tube, perforation import department is provided with the exhaust non retern valve, be provided with exhaust passage in the counter flange at top with outer core pipe and external communications, be provided with exhaust shutter in the exhaust passage, also be provided with the inlet channel that is communicated with cylinder body and the formed cannelure of lining simultaneously.
Described pneumatic down-hole hammer bit bottom lip surface structure is streamlined, and its cutting edge form is positive rake angle or negative rake, and institute's cloth hard-metal insert is post tooth or awl tooth on the bit body.
The utility model monomer major diameter pneumatic down-hole hammer realizes that by the twin-core pipe air feed, exhaust passage and anti-circulation slagging channel are built-in entirely, and compact conformation is reasonable, in light weight, low cost of manufacture and be convenient to assembling and safeguard.In addition, pneumatic down-hole hammer described in the utility model is because the supporting spiral-flow type reverse circulation drill bit that used, and by underflow field, hole optimal design, addition ejection structure, install measure such as exhaust non retern valve additional and can obtain anti-slag absorbing and the deslagging effect of circulating of good gaslift, prevent that effectively mud from recharging the phenomenon that causes the abrasion of internal motion component.
Description of drawings
Fig. 1 is a monomer major diameter pneumatic down-hole hammer overall structure schematic diagram described in the utility model;
Fig. 2 is spline pair sectional view in the utility model down-the-hole hammer;
Fig. 3 is spiral-flow type bit bottom lip surface structural representation in the utility model down-the-hole hammer;
Fig. 4 is the utility model down-the-hole hammer China and foreign countries core tubular structure schematic diagram;
Piston displacement when Fig. 5 is the work of the utility model down-the-hole hammer, speed curve diagram.
Among the figure: 1-spiral-flow type drill bit, 2-splined shaft, 3-spline housing, 4-cylinder block, 5-distribution cover, 6-lining, 7-upper flange, 8-counter flange, 9-twin-core pipe, 10-inner core tube, the outer core pipe of 11-, 12-piston, 13-exhaust non retern valve, 14-perforation, 15-exhaust shutter, 16-air guide annular groove, 17-inlet channel, 18-exhaust passage.
The specific embodiment
Below in conjunction with accompanying drawing monomer major diameter pneumatic down-hole hammer described in the utility model is elaborated:
As shown in Figure 1, monomer major diameter pneumatic down-hole hammer described in the utility model comprises spiral-flow type drill bit 1, splined shaft 2, spline housing 3, cylinder block 4, distribution cover 5, lining 6, upper flange 7, counter flange 8, piston 12 and center tracheae, above-mentioned parts are coaxial arrangement successively, tie with damping check bolt set associative the outside, axial location is carried out by the end face contact and with spacer in inside, the center tracheae is installed in piston inner hole, for improving its service behaviour, the cylinder block 4 of the utility model pneumatic down-hole hammer is selected single cylinder, and the center tracheae is a twin-core pipe 9, form by inner core tube 10 and outer core pipe 11, wherein Nei Bu elongated inner core pipe 10 is used to constitute the slagging channel that runs through inner chamber, this inner core tube 10 is plugged on the inside of outer core pipe 11, the two coaxial arrangement, and inner core tube 10 is carried out axial location by outer core pipe 11 upper surfaces and upper flange endoporus seam; Inner core tube 10 lower ends cooperate with the centre bore of splined shaft 2, adopt the two seals circle to constitute floating sealing structure between the two; And outer core pipe 11 is enclosed within the outside of inner core tube 10, offers air guide annular groove 16 between outer core pipe 11 endoporus and the inner core tube 10, is used for bypassing exhaust.
Described spiral-flow type drill bit 1 end labial surface adopts streamlined structure, can at the bottom of the hole, form the rotational flow field that is beneficial to slag absorbing, bit body is designed to the different cutting edge form in both sides, but makes full use of advantage that the rotary digging drill power head bi-directional rotary drives to obtain best drilling effect.Institute's cloth hard-metal insert type can be post tooth or awl tooth on the bit body.Spiral-flow type drill bit 1 adopts shock-proof check bolt group to be connected with splined shaft 2.
The splined shaft 2 that links to each other with spiral-flow type drill bit 1 in the utility model down-the-hole hammer is provided with the perforation 14 that communicates with inner core tube 10, the exhaust non retern valve of being made up of plug-in spool, valve seat and spring 13 is equipped with in perforation 14 import departments, described perforation 14 diameters are about 30～50mm, quantity is 3～4, with the axis inclination angle be 45～60 the degree; Be provided with simultaneously the exhaust passage 18 with outer core pipe 11 and external communications in the counter flange 8 of down-the-hole peen portion, be provided with exhaust shutter 15 in the exhaust passage 18.
In addition, the utility model down-the-hole hammer has farthest increased the quality (greater than 1 ton) of piston 12 when reducing cylinder block 4 external dimensions, guarantee that it has enough impact energys, cooperate the reasonable cloth tooth of bit body, so that under this impact energy effect, obtain good rock breaking efficiency.
The monomer major diameter pneumatic down-hole hammer that the utility model proposed is with existing all kinds of pneumatic down-hole hammers and the different of down-the-hole air hammer maximum: its internal configurations twin-core pipe 9, wherein inner core tube 10 is used for deslagging and seals the inner casing space, annular space between outer core pipe 11 and the inner core tube 10 is provided with the air guide annular groove of distribution, exhaust, and is mainly used in exhaust.Special setting has air distribution hole on the outer core pipe 11, has certain matching relationship in piston 12 motion processes all the time with it, so outer core pipe 11 also has guide effect simultaneously.Distribution cover 5, lining 6 and positioning spacer have constituted the space of piston, calm the anger in the cylinder of the air inlet input on lining 6, pressure is acted on each useful area of piston, but the valveless gas distribution structure driven plunger 12 of optimal design moves back and forth, impact velocity more than end of stroke acquisition 8m/s, the bump splined shaft also passes to bit body and the sword tooth that is connected as one with splined shaft with impact energy, thus in drilling process fractured rock.Backward stroke of the piston subsequently, backhaul end of a period piston speed is reduced to automatically and is not higher than 0.5m/s, has prevented that effectively the caused drilling tool in the piston slap seat of honour from damaging.Fig. 5 by the speed and the displacement curve of description piston motion process.
No matter adopt wet method or dry construction when creeping into, diameter 30～50mm that the utility model all can utilize the bottom to offer, quantity is 3～4, the inclination angle is that the perforation of 45～60 degree is discharged down-the-hole hammer work waste gas, aspirate in order to form the heterogeneous fluid that the jet absorption type structure comprises rock slag bits at the bottom of to the hole, and then utilize at a high speed last returning air-flow to form the anti-scum pipe that circulates of gaslift and flow.In fact, most stratum are moisture, need mud off in the loose overburden work progress mostly, even if therefore adopt dry construction, returning medium on the central passage also is the aerating mud that contains rock slag bits, the too high slurries that cause of mud pressure recharge when reaching certain depth for preventing to hole, and the utility model adds the exhaust non retern valve at injection channel entrance place.Can not form under the reverse circulating condition of gaslift in that mud pressure is too high, the utility model provides extraction flow to distribute choke valve, can improve injection passage capacity by the choke valve spool of changing the small-bore, in case of necessity can be with the complete shutoff in exhaust passage, choke valve place, thereby obtain maximum injection flow, but above-mentioned need of work is finished after carrying brill.Surpass 40 meters wet construction Large Diameter Pile Holes for the degree of depth, the utility model has been considered anti-circulation of employing pump suction and the anti-process combined method that circulates of gaslift.Spiral-flow type reverse circulation drill bit 1 action principle is in the utility model: when rotary digging drill power head is just changeing construction, can utilize the big rock of negative rake labial surface drilling toughness; Counter-rotating the time is then adopted the positive rake angle drilling, helps broken brittle rock, carries then continuing just changeing when boring and carries out the hole wall reconditioning.The bottom rock utilizes the meshing gold of post of close edge to cause volumetric fracture, when penetration rate fast, the smooth appropriate to the occasion counter-rotating of beating of deslagging, rock slag bits can enter slag suction mouth glibly along the eddy flow passage, and then return to the face of land continuously along central passage.The utility model has also designed " blowing by force " structure, drill bit lifted from the 60mm back piston drops down onto the below extreme position at the bottom of the hole, compressed air moment discharges at a high speed from the injection passage, at the bottom of the hole, form strong swabbing action, then obtain the speed of backflowing on the maximum in central passage, prevent that effectively rock slag bits card is stifled, guaranteed the reliability of continuous discharging slag.
Adopt the utility model to carry out heavy caliber hard rock churn drill when advancing, the unit head moment of torsion is passed to counter flange 8 and upper flange 7 by drilling rod and drives cylinder body 4 and drives a whole set of drilling tool revolution, can be observed splined shaft 2 by BB sectional view shown in Figure 2 and driven, and then make drill bit 1 revolution by the spline housing that cylinder body 4 connects.The pressure of the drill that is applied transmits by the end face contact between in the above driving-chain component.After optimal design and finite element analysis, under the ultimate load condition, the block distortion amount is no more than 1/2000, and the fit clearance between inner each component is kept.
The utility model pneumatic down-hole hammer does not have outer shell, realize that by the twin-core pipe air feed, exhaust passage and anti-circulation slagging channel are built-in entirely, compact conformation is reasonable, in light weight, low cost of manufacture and be convenient to assembling and safeguard for the product structure that CN2066480U proposed.In addition, with the supporting spiral-flow type reverse circulation drill bit that used of novel monomeric major diameter pneumatic down-hole hammer, by underflow field, hole optimal design, addition ejection structure, install measure such as exhaust non retern valve additional and obtain good anti-slag absorbing and the deslagging effect of circulating of gaslift, and prevented that effectively mud from recharging caused internal motion component abrasion.
Adopt the distribution of twin-core pipe to realize air inlet, exhaust and the full embedding structure of deslagging triple channel are the topmost characteristics of the utility model, outer core pipe plays the ballistic motion that distribution and guide effect have realized valveless distribution monomer enlarged bore piston simultaneously, the piston of structure thicker is to increase its quality in adopting, the central passage bottom is provided with perforation and has strengthened slag absorbing and deslagging effect in conjunction with the spiral-flow type reverse circulation drill bit, the inlet end of perforation is equipped with non retern valve, prevented that effectively mud from recharging, the extraction flow distributing valve is installed in the counter flange 8, can regulates the perforation capacity.
Claims (4)
1. monomer major diameter pneumatic down-hole hammer, comprise spiral-flow type drill bit (1), splined shaft (2), spline housing (3), cylinder block (4), distribution cover (5), lining (6), upper flange (7), counter flange (8), piston (12) and center tracheae, above-mentioned parts are coaxial arrangement successively, tie with damping check bolt set associative the outside, axial location is carried out by the end face contact and with spacer in inside, the center tracheae is installed in piston (12) endoporus, it is characterized in that: described cylinder block (4) is a single cylinder, and the center tracheae is twin-core pipe (9), form by inner core tube (10) and outer core pipe (11), inner core tube (10) is plugged on the inside of outer core pipe (11), offers air guide annular groove (16) between outer core pipe (11) endoporus and the inner core tube (10); The splined shaft (2) that links to each other with spiral-flow type drill bit (1) is provided with the perforation (14) that communicates with inner core tube, perforation (14) import department is provided with exhaust non retern valve (13), be provided with exhaust passage (18) in the counter flange at top (8) with outer core pipe (11) and external communications, be provided with exhaust shutter (15) in the exhaust passage, also be provided with the inlet channel (17) that is communicated with cylinder body and the formed cannelure of lining simultaneously.
2. monomer major diameter pneumatic down-hole hammer as claimed in claim 1 is characterized in that: described aeratic hidden hole hammer bit (1) end labial surface structure is streamlined, and its cutting edge form is positive rake angle or negative rake, and institute's cloth hard-metal insert is post tooth or awl tooth on the bit body.
3. monomer major diameter pneumatic down-hole hammer as claimed in claim 1 is characterized in that: perforation (14) quantity on the described splined shaft (2) is 3-4, diameter 30-50mm, and the inclination angle of hammering axis with down-the-hole into shape is the 45-60 degree.
4. monomer major diameter pneumatic down-hole hammer as claimed in claim 1 is characterized in that: described inner core tube (10) is carried out axial location by outer core pipe (11) upper surface and upper flange (7) endoporus seam; Inner core tube (10) lower end cooperates with the centre bore of splined shaft (2), adopts the two seals circle to constitute floating sealing structure between the two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205648677U CN201857895U (en) | 2010-10-12 | 2010-10-12 | Single large-diameter pneumatic DTH (down the hole) hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205648677U CN201857895U (en) | 2010-10-12 | 2010-10-12 | Single large-diameter pneumatic DTH (down the hole) hammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201857895U true CN201857895U (en) | 2011-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205648677U Expired - Lifetime CN201857895U (en) | 2010-10-12 | 2010-10-12 | Single large-diameter pneumatic DTH (down the hole) hammer |
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| Country | Link |
|---|---|
| CN (1) | CN201857895U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003139A (en) * | 2010-10-12 | 2011-04-06 | 贵州航天天马机电科技有限公司 | Single body large-diameter pneumatic down-the-hole hammer |
| CN102518393A (en) * | 2011-12-15 | 2012-06-27 | 贵州航天天马机电科技有限公司 | Combined down-the-hole hammer |
| CN105298417A (en) * | 2014-05-29 | 2016-02-03 | 贵州航天天马机电科技有限公司 | Gas distribution and residue discharging drill rod system of rotary drilling rig |
| CN105934557A (en) * | 2014-01-21 | 2016-09-07 | 山特维克知识产权股份有限公司 | Quick release down-the-hole hammer drill bit assembly |
| CN106030022A (en) * | 2014-11-14 | 2016-10-12 | 斯特拉达设计有限公司 | Dual circulation fluid hammer drilling system |
-
2010
- 2010-10-12 CN CN2010205648677U patent/CN201857895U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003139A (en) * | 2010-10-12 | 2011-04-06 | 贵州航天天马机电科技有限公司 | Single body large-diameter pneumatic down-the-hole hammer |
| CN102003139B (en) * | 2010-10-12 | 2012-12-19 | 贵州航天天马机电科技有限公司 | Single body large-diameter pneumatic down-the-hole hammer |
| CN102518393A (en) * | 2011-12-15 | 2012-06-27 | 贵州航天天马机电科技有限公司 | Combined down-the-hole hammer |
| CN102518393B (en) * | 2011-12-15 | 2014-01-22 | 贵州航天天马机电科技有限公司 | Combined down-the-hole hammer |
| CN105934557A (en) * | 2014-01-21 | 2016-09-07 | 山特维克知识产权股份有限公司 | Quick release down-the-hole hammer drill bit assembly |
| CN105934557B (en) * | 2014-01-21 | 2019-08-06 | 山特维克知识产权股份有限公司 | Quick release down-the-hole hammer drill head assembly |
| CN105298417A (en) * | 2014-05-29 | 2016-02-03 | 贵州航天天马机电科技有限公司 | Gas distribution and residue discharging drill rod system of rotary drilling rig |
| CN106030022A (en) * | 2014-11-14 | 2016-10-12 | 斯特拉达设计有限公司 | Dual circulation fluid hammer drilling system |
| CN106030022B (en) * | 2014-11-14 | 2020-08-25 | 斯特拉达设计有限公司 | Dual cycle fluid hammer drilling system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110608 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |