CN210598825U

CN210598825U - Pneumatic impact reamer

Info

Publication number: CN210598825U
Application number: CN201921043624.6U
Authority: CN
Inventors: 周升风
Original assignee: Jiujiang Langwei Construction Machinery Co Ltd
Current assignee: Jiujiang Langwei Construction Machinery Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-05-22
Anticipated expiration: 2029-07-05

Abstract

The utility model discloses a pneumatic impact reamer, including top connection, upper end cover, dabber, outer cylinder, impact hammer and drill bit, the top connection adopts conversion knot type top connection, the top connection is connected with the dabber, the top connection passes through threaded connection dabber and outer cylinder, the cover is equipped with support sleeve and bush in proper order in the outer cylinder, impact hammer suit is inside bush, outer cylinder and spacer sleeve, the drill bit passes through spline housing fixed mounting inside the outer cylinder, the drill bit is kept away from the one end of top connection and is provided with the joint of righting, set up a plurality of air vents and drain hole on the joint of righting; compared with a binding type impact reamer, the pneumatic impact reamer has the advantages of simpler structure, no welding part, more impact resistance on the whole and more reliable work; the effective impact mass of the impact hammer of the pneumatic impact reamer is much larger than that of the binding type impact reamer, so that the pneumatic impact reamer can achieve larger impact energy and the rock breaking efficiency is much higher.

Description

Pneumatic impact reamer

Technical Field

The utility model relates to a enlarger technical field, in particular to pneumatic percussion reamer.

Background

And in the horizontal directional crossing pipe laying construction process, the reamer is used for reaming construction after pilot hole construction is finished. Existing reamers for rock formations have: the binding type impact reamer, the roller cone reamer and the hob reamer have certain defects in the construction of horizontal directional crossing and pipe laying by adopting the reamers.

(1) The binding type impact reamer is used for realizing the large-diameter reaming function by binding a plurality of conventional down-the-hole impactors and drill bits on a mandrel, and has the following defects: 1) the binding structure is complex and the reliability is low; 2) the eccentric wear of the drill bit inevitably occurs. Because of these drawbacks, the bundled impact reamer has not been marketed.

(2) The existing cone reamer, hob reamer and the like have low drilling efficiency in hard rock reaming drilling, and use a large amount of high-proportion slurry, so that the construction cost is high.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a pneumatic impact reamer, which can effectively solve the problems of the prior art.

In order to achieve the above object, the utility model provides a following technical scheme: a pneumatic impact reamer is characterized in that the reamer is connected with a drilling machine through a drill rod and comprises an upper joint, an upper end cover, a mandrel, an outer cylinder, a punching hammer and a drill bit, wherein the upper joint is of a conversion buckle type and is connected with an air supply end, the upper joint is connected with the mandrel, the mandrel is positioned on a central shaft of the outer cylinder, the upper end cover is connected with the mandrel and the outer cylinder through threads, a support sleeve and a bushing are sequentially sleeved in the outer cylinder, the punching hammer is sleeved in the bushing, the outer cylinder and a spacer sleeve, the bushing and the spacer sleeve are respectively positioned at two ends of the punching hammer, the drill bit is fixedly arranged in the outer cylinder through a spline sleeve, the drill bit is positioned at one end, far away from the upper joint, of the drill bit is provided with a centering joint, the centering joint is connected with one end, far away from the upper joint, of the mandrel, the centering joint is connected with the drill rod, the inside of righting the joint and being close to dabber one end is provided with the spring, the spline housing is connected with the outer cylinder through the screw thread.

Preferably, the spline housing is located the inside one end of outer jar and is provided with the spacer sleeve, the spacer sleeve is used for preventing that the drill bit from deviating from in the outer jar, the spacer sleeve is two semi-circular structures, the cover is equipped with O type circle on the spacer sleeve, O type circle is used for preventing that two semi-circular spacer sleeves from breaking away.

Preferably, the upper end cover is provided with a shock pad at one end in contact with the support sleeve and the outer cylinder, and the shock pad is used for reducing impact force on the outer cylinder, the upper end cover and the mandrel when the impact hammer impacts.

Preferably, a central hole is formed in one end, close to the centering joint, of the mandrel, a check valve is installed in the central hole, and a sealing ring is sleeved at one end, in contact with the inner wall of the central hole, of the outer surface of the check valve.

Preferably, the centralizing joint is provided with a plurality of air guide holes and liquid guide holes.

Compared with the prior art, the utility model discloses following beneficial effect has:

1) compared with a binding type impact reamer, the pneumatic impact reamer has the advantages that the structure is simpler, welding parts are omitted, the pneumatic impact reamer is more impact-resistant on the whole, and the work is more reliable; the enlarger of the same reaming diameter compares, the utility model discloses a pneumatic percussion reamer will be than the big a lot of bundling percussion reamer because of its effective impact mass (impact hammer), so can reach bigger percussion power, broken rock efficiency also can be high a lot.

2) Because the drilling rate of pneumatic down-the-hole hammer is than the drilling rate of roller bit and hobbing cutter drill bit many more, the utility model provides a pneumatic impact reamer is exactly the broken rock principle of the impact that utilizes pneumatic down-the-hole hammer, therefore its broken rock efficiency of reaming also will improve a lot than hobbing cutter reamer bit and hobbing cutter reamer bit.

3) When using this pneumatic impact enlarger to carry out reaming construction, because compressed air and mud, clear water or foam liquid can lead to simultaneously in the drilling, can form different kinds of flush fluid in drilling, can allocate according to different operating modes, and then obtain the best effect of washing the hole bottom and carrying the detritus, great detritus also can be carried out, reduce the repeated broken probability of drill bit on the one hand like this, thereby improve reaming efficiency, on the other hand is downthehole clean relatively and is favorable to follow-up smooth pipe dragging construction.

Drawings

Fig. 1 is a schematic view of a pneumatic percussion reamer according to the present invention;

fig. 2 is an enlarged view of fig. 1 at a.

In the figure: 1. an upper joint; 2. an upper end cover; 3. a support sleeve; 4. a bushing; 5. an outer cylinder; 6. punching a hammer; 7. a mandrel; 8. a spacer sleeve; 9. a blocking sleeve; 10. a non-return valve; 11. a spring; 12. a spline housing; 13. a drill bit; 14. righting the joint; 15. a shock pad; 16. an O-shaped ring; 17. a seal ring; 18. an air vent; 19. and a liquid guide hole.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Example 1

As shown in fig. 1-2, a pneumatic impact reamer, the reamer is connected with a drilling machine through a drill rod, the pneumatic impact reamer comprises an upper joint 1, an upper end cover 2, a mandrel 7, an outer cylinder 5, a punch hammer 6 and a drill bit 13, the upper joint 1 adopts a conversion buckle type upper joint 1, the upper joint 1 is connected with an air supply end, the upper joint 1 is connected with the mandrel 7, the mandrel 7 is positioned on the central shaft of the outer cylinder 5, the upper end cover 2 is connected with the mandrel 7 and the outer cylinder 5 through threads, a support sleeve 3 and a bush 4 are sequentially sleeved in the outer cylinder 5, the punch hammer 6 is sleeved in the bush 4, the outer cylinder 5 and a spacer sleeve 8, the bush 4 and the spacer sleeve 8 are respectively positioned at two ends of the punch hammer 6, the drill bit 13 is fixedly arranged in the outer cylinder 5 through a spline sleeve 12, the drill bit 13 is positioned at one end of the outer cylinder 5 far away from the upper joint 1, a centralizing joint 14 is arranged at one end, when in use, the centralizing joint 14 is connected with a drill rod at a liquid feeding end, a spring 11 is arranged inside one end, close to the mandrel 7, of the centralizing joint 14, and the spline sleeve 12 is connected with the outer cylinder 5 through threads.

Because the drilling speed of the pneumatic down-the-hole hammer is much higher than that of the roller bit 13 and the hob bit 13, the pneumatic percussion reamer utilizes the percussion rock breaking principle of the pneumatic down-the-hole hammer, and therefore the reaming and rock breaking efficiency of the pneumatic percussion reamer is much higher than that of the roller bit 13 and the hob bit 13.

As shown in fig. 1-2, a blocking sleeve 9 is arranged at one end of the spline housing 12 located inside the outer cylinder 5, the blocking sleeve 9 is used for preventing the drill bit 13 from being separated from the outer cylinder 5, the blocking sleeve 9 is of two semicircular structures, an O-ring 16 is sleeved on the blocking sleeve 9, and the O-ring 16 is used for preventing the two semicircular blocking sleeves 9 from being separated.

As shown in fig. 1-2, the end of the upper end cap 2 contacting the support sleeve 3 and the outer cylinder 5 is provided with a shock absorbing pad 15, and the shock absorbing pad 15 is used for reducing the impact force on the outer cylinder 5, the upper end cap 2 and the mandrel 7 when the impact hammer 6 impacts.

As shown in fig. 1-2, a central hole is formed at one end of the mandrel 7 close to the centering joint 14, a check valve 10 is installed in the central hole, and a sealing ring 17 is sleeved at one end of the outer surface of the check valve 10, which is in contact with the inner wall of the central hole.

As shown in fig. 1-2, the centralizing joint 14 is provided with a plurality of air vents 18 and liquid vents 19.

By adopting the technical scheme, compared with the existing binding type impact reamer which is not popularized, the pneumatic impact reamer has the advantages that the structure is simpler, welding parts are not needed, the whole pneumatic impact reamer is more impact-resistant, and the work is more reliable; compared with the reamer with the same reaming diameter, the pneumatic impact reamer can achieve larger impact energy and higher rock breaking efficiency due to the fact that the effective impact mass of the pneumatic impact reamer is much larger than that of the binding type impact reamer. When an axial force opposite to the working state is applied to the impactor, the drill bit 13 slides out of the spline housing 12 for a certain distance, the impact hammer 6 does not perform impact work, and a large amount of compressed air is sprayed into a drill hole from the air guide hole 18 arranged on the centering joint 14, so that the effects of cleaning the hole and discharging rock debris are achieved.

It should be noted that, when the pneumatic impact reamer of the present invention is used, as shown in fig. 1, compressed air enters the interior of the impact reamer from the left end to drive the impact hammer 6 to impact the drill bit 13 to crush the rock; the working principle of the impact reamer is the same as that of a common pneumatic impactor, and the detailed description is omitted; except that the compressed air is led into the central hole of the mandrel 7 after driving the hammer 6 to do work and then passes through the stopping hole

The check valve 10 enters a centralizing sub 14, the centralizing sub 14 has a plurality of gas and liquid-conducting

ports

18 and 19, and compressed air is discharged from the gas ports 18 into the borehole to cool the drill bit 13 and remove debris from the working surface. The compressed air then carries the mud and debris out of the borehole. When too much rock debris is accumulated in the drill hole, the drill rod is pushed to enable the impactor to leave the working surface, the impact hammer does not perform impact work, and a large amount of compressed air is sprayed into the drill hole through the inner hole of the mandrel and the air guide hole 18 to play a role in cleaning the hole. When cleaning the hole, slurry, clear water or foam liquid is fed into the drill rod from the liquid feeding end and enters the drill hole through the liquid guide hole 19 to form a gas-liquid mixture with compressed air, so that the capability of carrying rock debris is effectively improved, and the hole cleaning effect is improved.

When the drill rod centralizer is used, the upper connector 1 can be in different structural forms, can be in the form of a multi-wing centralizer, and can also be used for directly connecting a drill rod with the mandrel 7 without the upper connector 1.

The inner hole of the centralizing joint 14 can be opened, and the air guide hole 18 and the liquid guide hole 19 can be combined into a group to simultaneously pass air and liquid. The gas and

liquid guide holes

18 and 19 may also be machined into the mandrel or other parts connected to the mandrel.

The drill bit 13 may be formed in various forms, and may be provided with a duct for communicating with the interior of the reamer for passing compressed air therethrough.

The outer diameter of the upper joint 1 can be close to that of the drill bit 13, the diameter of the centralizing joint 14 is reduced, a wing plate can be additionally arranged, and rock debris carried by compressed air or gas-liquid mixture returns to the ground from the space between a drill rod at the liquid conveying end and the hole wall.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A pneumatic impact reamer is connected with a drilling machine through a drill rod and comprises an upper joint (1), an upper end cover (2), a mandrel (7), an outer cylinder (5), a punching hammer (6) and a drill bit (13), and is characterized in that the upper joint (1) adopts a conversion buckle type upper joint (1), the upper joint (1) is connected with an air supply end, the upper joint (1) is connected with the mandrel (7), the mandrel (7) is positioned on a central shaft of the outer cylinder (5), the upper end cover (2) is in threaded connection with the mandrel (7) and the outer cylinder (5), a support sleeve (3) and a bushing (4) are sequentially sleeved in the outer cylinder (5), the punching hammer (6) is sleeved in the bushing (4), the outer cylinder (5) and a spacer sleeve (8), the bushing (4) and the spacer sleeve (8) are respectively positioned at two ends of the punching hammer (6), and the drill bit (13) is fixedly installed in the outer cylinder (5) through a spline sleeve (12), the drill bit (13) is positioned at one end, far away from the upper joint (1), of the outer cylinder (5), the end, far away from the upper joint (1), of the drill bit (13) is provided with a centering joint (14), the centering joint (14) is connected to one end, far away from the upper joint (1), of the mandrel (7), the centering joint (14) is connected with a drill rod at a liquid feeding end when the drill bit is used, a spring (11) is arranged inside the centering joint (14) close to one end of the mandrel (7), and the spline sleeve (12) is connected with the outer cylinder (5) through threads.

2. The pneumatic percussion reamer according to claim 1, wherein the spline housing (12) is provided with a spacer sleeve (9) at one end inside the outer cylinder (5), the spacer sleeve (9) is used for preventing the drill bit (13) from being disengaged from the outer cylinder (5), the spacer sleeve (9) is in two semicircular structures, the spacer sleeve (9) is sleeved with an O-ring (16), and the O-ring (16) is used for preventing the two semicircular spacer sleeves (9) from being disengaged.

3. A pneumatic impact reamer according to claim 1, wherein the end of the upper end cap (2) in contact with the support sleeve (3) and the outer cylinder (5) is provided with a shock absorbing pad (15), and the shock absorbing pad (15) is used for reducing the impact force on the outer cylinder (5), the upper end cap (2) and the mandrel (7) when the impact hammer (6) impacts.

4. The pneumatic percussion reamer of claim 1, wherein a central hole is formed in one end of the mandrel (7) close to the centralizing joint (14), a check valve (10) is installed in the central hole, and a sealing ring (17) is sleeved at one end, contacting with the inner wall of the central hole, of the outer surface of the check valve (10).

5. A pneumatic percussion reamer according to claim 1, in which the centralizing sub (14) has a plurality of gas (18) and fluid (19) ports formed therein.