CN211028167U - Shaft sleeve clamping device in shaft sleeve drilling machine - Google Patents

Abstract

The utility model discloses an axle sleeve clamping device in axle sleeve drilling machine, include: the drilling machine comprises a rack, wherein a servo speed reducing motor is arranged on one side of the rack, a core rod is arranged on an output shaft of the servo speed reducing motor, the core rod is provided with a step, and a circle of drilling avoiding groove is formed in the end part of the core rod; the other side of the rack is provided with a jacking cylinder, the outer end part of a piston rod of the jacking cylinder is sleeved with a follow-up jacking sleeve, the follow-up jacking sleeve can freely and radially rotate relative to the piston rod through a plane bearing and a ball bearing and cannot be axially and movably arranged on the piston rod relative to the piston rod, the follow-up jacking sleeve and the core rod are coaxially and oppositely distributed, the follow-up jacking sleeve can clamp the shaft sleeve in a relatively clamping manner with the core rod under the pushing of the piston rod of the jacking cylinder, and the follow-up jacking sleeve cannot prevent a servo speed reduction motor from driving the clamped shaft sleeve to rotate through the core rod. The utility model has the advantages of convenient operation and clamping can not arouse the axle sleeve to warp.

Description

Shaft sleeve clamping device in shaft sleeve drilling machine

Technical Field

The utility model relates to an internal-combustion engine slide bearing processing equipment technical field, the axle sleeve clamping device in the concretely relates to axle sleeve drilling machine.

Background

The sliding bearing is a member for fixing and reducing the friction coefficient of a load during mechanical transmission, and particularly, a member for reducing the friction coefficient during power transmission and keeping the center position of a shaft fixed when other members are moved relative to each other on the shaft. The shaft sleeve is a cylindrical mechanical part sleeved on the rotating shaft and is an important component of a sliding bearing, when a gap between the rotating shaft and the outer pipe is small, the smooth shaft sleeve can be used as the bearing, when the shaft sleeve is machined, a plurality of radial oil holes are required to be formed in the wall of the shaft sleeve for meeting the lubricating requirement, the oil holes are usually communicated with an oil groove in the inner surface of the shaft sleeve, and in order to ensure that enough lubricating oil is contained in a groove when the shaft sleeve works, the oil holes are required to have higher machining precision. The drilling method generally adopted at present is as follows: firstly, clamping by using a vice or a three-jaw chuck, then manually using a drilling machine to perform radial drilling action of an oil hole on the annular region to be drilled on the shaft sleeve, then loosening the vice or the three-jaw chuck, rotating the shaft sleeve by a certain angle, then clamping by using the vice or the three-jaw chuck again, and then manually using the drilling machine to perform radial drilling action of the next oil hole on the annular region to be drilled on the shaft sleeve. The shaft sleeve clamping mode has the following defects: (1) the shaft sleeve is easy to deform during clamping, and the quality of the shaft sleeve is affected; (2) the shaft sleeve is required to be frequently clamped and disassembled in the shaft sleeve machining process, so that the operation is inconvenient, the drilling efficiency is influenced, and the drilling quality is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can not arouse the axle sleeve clamping device in the axle sleeve drilling machine that the axle sleeve warp during convenient operation and clamping.

In order to achieve the above purpose, the utility model adopts the following technical scheme: axle sleeve clamping device in axle sleeve drilling machine includes: the drilling machine comprises a rack, wherein a servo speed reducing motor is transversely arranged on one side of the rack, a mandrel for sleeving a shaft sleeve is coaxially arranged on an output shaft of the servo speed reducing motor, the mandrel is in a reducing shape, a step for the shaft sleeve sleeved on the mandrel to abut against is formed at the reducing part of the mandrel, a circle of drilling avoiding groove is arranged on the outer circumferential wall of the end part of the mandrel, and when the shaft sleeve is sleeved on the mandrel and abuts against the step, the drilling avoiding groove just corresponds to an annular area to be drilled on the shaft sleeve; the other side of the rack is transversely provided with a jacking cylinder, the outer end part of a piston rod of the jacking cylinder is sleeved with a follow-up jacking sleeve, a plane bearing and a ball bearing are arranged between the follow-up jacking sleeve and the piston rod, the follow-up jacking sleeve can freely and radially rotate relative to the piston rod through the plane bearing and the ball bearing and cannot be axially and movably arranged on the piston rod relative to the piston rod, the follow-up jacking sleeve and a core rod are coaxially and oppositely distributed, the follow-up jacking sleeve can clamp a shaft sleeve in a relatively clamping manner with the core rod under the pushing of the piston rod of the jacking cylinder, and the follow-up jacking sleeve cannot prevent a servo speed reduction motor from driving the clamped shaft sleeve to rotate through; and a drilling assembly capable of radially drilling the shaft sleeve clamped and fixed by the core rod and the follow-up jacking sleeve is further arranged on the rack.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: the drilling assembly includes: the drilling machine comprises a driving motor, a drilling power head arranged on an output shaft of the driving motor and an oil cylinder for pushing the driving motor to move.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: a horizontal transverse moving track with a left-right trend is arranged at the front end of the top of the rack, an installation frame is arranged on the horizontal transverse moving track in a sliding manner, a servo speed reducing motor and a jacking cylinder are arranged on the installation frame in a left-right opposite manner, and the installation frame moves along the horizontal transverse moving track under the driving of a transverse moving driving assembly; the drilling machine is characterized in that a horizontal longitudinal moving rail moving forwards and backwards is arranged at the rear end of the top of the rack, a sliding seat is arranged on the horizontal longitudinal moving rail in a sliding mode, a driving motor is installed on the sliding seat, and an oil cylinder is installed on the rack and used for pushing the driving motor and a drilling power head to move along the horizontal longitudinal moving rail.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: the structure of the traverse driving component comprises: the fixed plate is vertically installed on the rack on the left side or the right side of the mounting frame, the lead screw penetrates through the fixed plate, the lead screw can be radially rotated through the bearing and cannot be axially movably arranged in the fixed plate, the handle is arranged at one end of the lead screw, and the other end of the lead screw penetrates through the mounting frame and is in threaded connection with the mounting frame.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: the pushing sleeve is sleeved outside the core rod, cannot rotate radially relative to the core rod but can only move axially relative to the core rod, and can move axially outwards along the core rod under the driving of the pushing assembly until the shaft sleeve after drilling pushes out the core rod or moves inwards along the axial direction of the core rod for resetting.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: the structure of pushing equipment includes: the push rod is connected with an arc-shaped push plate positioned in the annular limiting groove, and the arc-shaped push plate cannot prevent the push sleeve from rotating along with the core rod.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: the specific connecting structure of the pushing sleeve and the core rod is as follows: the outer circumferential wall of the core rod is provided with a plurality of axial sliding grooves along the circumferential direction, each axial sliding groove is internally provided with a pin shaft moving along the corresponding axial sliding groove, and each pin shaft is connected and fixed on the material pushing sleeve.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: and the machine frame is provided with a blowing component for blowing and cleaning ash of the shaft sleeve during drilling.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: the structure of jetting subassembly includes: the nozzle is aligned downwards to the nozzle of the drilling avoiding groove on the core rod and is connected with a high-pressure air source through an air pipe.

Further, axle sleeve clamping device in the aforesaid axle sleeve drilling machine, wherein: and a shaft sleeve drilling correction reticle for aligning the seam on the shaft sleeve is arranged on the outer wall of the core rod.

Through the implementation of the above technical scheme, the beneficial effects of the utility model are that: (1) the shaft sleeve cannot deform during clamping, so that the quality of the shaft sleeve is ensured; (2) need not frequent clamping and dismantlement axle sleeve in the axle sleeve course of working, convenient operation, work efficiency is high, and drilling quality is good, has guaranteed the drilling quality of axle sleeve.

Drawings

Fig. 1 is a schematic structural view of a shaft sleeve clamping device in a shaft sleeve drilling machine according to the present invention.

Fig. 2 is a schematic structural view in the right-hand direction of fig. 1.

Fig. 3 is an enlarged schematic view of a portion H shown in fig. 1.

Fig. 4 is an enlarged schematic view of a portion F shown in fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, and that the configuration and operation of the particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise indicated, "a plurality" means two or more.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1, 2, 3 and 4, the bushing clamping device in the bushing drilling machine includes: the drilling machine comprises a rack 1, wherein a horizontal transverse moving track 2 with a left-right trend is arranged at the front end of the top of the rack 1, an installation frame 3 is arranged on the horizontal transverse moving track 2 in a sliding manner, the installation frame 3 moves along the horizontal transverse moving track 2 under the driving of a transverse moving driving assembly, a servo speed reducing motor 4 controlled by a servo controller is transversely arranged on the left side of the installation frame 3, a mandrel 5 for a shaft sleeve to be sleeved in is coaxially arranged on an output shaft of the servo speed reducing motor 4, the mandrel 5 is arranged in a diameter-variable shape, a step for the shaft sleeve sleeved in the mandrel 5 to abut against is formed at the diameter-variable position of the mandrel 5, a circle of drilling avoiding groove 6 is arranged on the outer circumferential wall of the end part of the mandrel 5, and when the shaft sleeve is sleeved in the mandrel 5; a jacking cylinder 7 is transversely arranged on the right side of the mounting frame 3, the servo gear motor 4 and the jacking cylinder 7 are arranged on the mounting frame 3 in a left-right opposite manner, a follow-up jacking sleeve 8 is sleeved on the outer end part of a piston rod of the jacking cylinder 7, a planar bearing 10 and a ball bearing 11 are arranged between the follow-up jacking sleeve 8 and the piston rod 9, the follow-up jacking sleeve 8 can freely rotate radially relative to the piston rod 9 through the planar bearing 10 and the ball bearing 11 and cannot be axially movably mounted on the piston rod 9 relative to the piston rod 9, the follow-up jacking sleeve 8 and the core rod 5 are coaxially and relatively distributed, the follow-up jacking sleeve 8 can clamp a shaft sleeve in a relatively clamping manner with the core rod 5 under the pushing of the piston rod of the jacking cylinder 7, and the follow-up jacking sleeve 8 cannot hinder the rotation of the shaft sleeve which is driven by; the machine frame 1 is also provided with a drilling component which can radially drill the shaft sleeve clamped and fixed by the core rod 5 and the follow-up jacking sleeve 8; in this embodiment, the drilling assembly comprises: a horizontal longitudinal movement track 12 moving forwards and backwards is arranged at the rear end of the top of the rack 1, a sliding seat 13 is arranged on the horizontal longitudinal movement track 12 in a sliding manner, a driving motor 14 is arranged on the sliding seat 13, a drilling power head 15 is arranged on an output shaft of the driving motor 14, and the sliding seat 13 moves forwards and backwards along the horizontal longitudinal movement track 12 under the driving of an oil cylinder 16 arranged on the rack 1;

in this embodiment, the traverse driving assembly has a structure including: a fixing plate 17 is vertically installed on the rack 1 on the right side of the mounting frame 3, a screw rod 18 penetrates through the fixing plate 17, the screw rod 18 can radially rotate through a bearing and cannot be axially moved and is arranged in the fixing plate 17, a handle 19 is arranged at one end of the screw rod 18, the other end of the screw rod 18 penetrates through the mounting frame 3 and is in threaded connection with the mounting frame 3, when the handle 19 rotates forwards or backwards, the mounting frame 3 can be driven to move leftwards or rightwards along the horizontal transverse moving track 2, and the transverse moving driving assembly is simple in structure and convenient to install and maintain;

in this embodiment, a pushing sleeve 20 is sleeved outside the core rod 5, when the pushing sleeve 20 is sleeved on the core rod 5, the pushing sleeve 20 is a step against which a shaft sleeve sleeved on the core rod 5 abuts, the pushing sleeve 20 cannot rotate radially relative to the core rod 5 but can only be mounted on the core rod 5 in an axially moving manner relative to the core rod 5, and the pushing sleeve 20 can move axially outward along the core rod 5 under the driving of a pushing assembly to push the shaft sleeve after drilling out of the core rod 5 or move axially inward along the core rod 5 for resetting; in this embodiment, the specific connection structure between the pushing sleeve 20 and the core rod 5 is as follows: a plurality of axial sliding grooves 25 are circumferentially arranged on the outer circumferential wall of the core rod 5, a pin shaft 26 moving along the corresponding axial sliding groove 25 is respectively arranged in each axial sliding groove 25, and each pin shaft 26 is connected and fixed on the material pushing sleeve 20;

in this embodiment, the structure of the pushing assembly includes: a material pushing cylinder 21 is transversely arranged on the mounting frame 3, a mounting plate 22 is arranged on a piston rod of the material pushing cylinder 21, a push rod 23 is arranged on the mounting plate 22, a circle of annular limiting groove 31 is arranged on the outer circumferential wall of the material pushing sleeve 20, an arc-shaped push plate 24 positioned in the annular limiting groove 31 is connected to the push rod 23, the arc-shaped push plate 24 cannot prevent the material pushing sleeve 20 from rotating along with the core rod 5, when the piston rod of the material pushing cylinder 21 extends out or retracts, the material pushing sleeve 20 can be driven by the mounting plate 22, the push rod 23 and the push plate 24 to move outwards along the axial direction of the core rod 5 to push a shaft sleeve after drilling out of the core rod 5 or move inwards along the axial direction of the core rod 5 for; in the embodiment, a return spring 30 is connected between the mounting frame 3 and the mounting plate 22, and the return spring 30 is used for assisting in driving the pushing sleeve 20 to move inwards along the axial direction of the core rod 5 for resetting;

in this embodiment, be provided with the jetting subassembly that is used for carrying out the jetting deashing to the axle sleeve when drilling on frame 1, the structure of jetting subassembly includes: the nozzle 27 of the hole-drilling avoiding groove 6 on the core rod 5 is aimed downwards, the nozzle 27 is connected with a high-pressure air source 29 through an air pipe 28, and the drilling quality can be further improved through the blowing assembly;

in the embodiment, a shaft sleeve drilling correction scribed line for aligning a seam on a shaft sleeve is arranged on the outer wall of the core rod 5; when the seam on the shaft sleeve sleeved on the core rod is aligned with the shaft sleeve drilling correction reticle, the oil holes drilled on the shaft sleeve by the drilling assembly at the moment are positioning holes for positioning the positions of the rest oil holes on the shaft sleeve, and meanwhile, the positions of the oil holes are enabled to avoid the seam of the shaft sleeve; when treating the axle sleeve of drilling and forming for bending the concatenation, because there is the seam on this type of axle sleeve, for guaranteeing drilling quality, not only need avoid the seam during drilling, keep certain angle between oilhole and the seam moreover, consequently need drill a location that is used for remaining oilhole position on the axle sleeve and use the hole, the accurate position of this location is confirmed through the axle sleeve drilling correction ruling on aligning the seam on the axle sleeve to plug 5, promptly: when the seam on the shaft sleeve sleeved on the core rod 5 is aligned with the shaft sleeve drilling correction reticle, the oil holes drilled by the drilling power head 15 on the shaft sleeve at the moment are positioning holes for positioning the positions of the rest oil holes on the shaft sleeve; when the shaft sleeve to be drilled is integrally cast, the shaft sleeve drilling hole is not needed to be used for correcting the scribed line;

the working principle of the utility model is as follows:

when the shaft sleeve with the seam is drilled, the shaft sleeve to be drilled is firstly sleeved on the core rod 5, then the shaft sleeve is rotated, so that the seam on the shaft sleeve is aligned with the shaft sleeve drilling correction reticle, and when the shaft sleeve formed by integrally casting is drilled, the shaft sleeve is sleeved on the core rod 5 without rotating the shaft sleeve;

then, a piston rod 9 of the jacking cylinder 7 extends out to push the follow-up jacking sleeve 8 to move towards the core rod 5 until the follow-up jacking sleeve 8 tightly jacks the shaft sleeve on the pushing sleeve 20, the pushing sleeve 20 is tightly jacked on a step formed at the diameter-changing position of the core rod 5, at the moment, the follow-up jacking sleeve 8, the shaft sleeve, the pushing sleeve 20, the core rod 5 and an output shaft of the servo speed-reducing motor 4 are connected and fixed into a whole, and at the moment, an annular region to be drilled on the shaft sleeve just corresponds to the drilling avoiding groove 6 of the core rod 5; then, the handle 19 is rotated to drive the mounting rack 3 to move leftwards or rightwards along the horizontal transverse moving track 2, and when the annular area to be drilled on the shaft sleeve is positioned on the advancing route of the drilling power head 15, the handle 19 is stopped rotating;

then, starting the driving motor 14, enabling the driving motor 14 to drive the drilling power head 15 to rotate, enabling the oil cylinder 16 to drive the driving motor 14 and the drilling power head 15 to move forwards along the horizontal longitudinal movement track 12 until the drilling power head 15 finishes radial drilling of the shaft sleeve, wherein the drilled oil holes are positioning holes for positioning the positions of other oil holes on the shaft sleeve, and in the process that the drilling power head 15 drills the shaft sleeve, opening the high-pressure air source 29 to enable high-pressure air in the high-pressure air source 29 to blow and clean the shaft sleeve through the air pipe 28 and the nozzle 27; after the drilling power head 15 completes drilling of one oil hole, the oil cylinder 16 drives the driving motor 14 and the drilling power head 15 to move backwards to the initial position along the horizontal longitudinal movement track 12;

then, the output shaft of the servo speed reducing motor 4 is controlled to rotate through the servo controller through the positions of the positioning holes and the relative positions of the rest holes and the positioning holes, after the servo speed reducing motor 4 drives the shaft sleeve clamped by the core rod 5 and the follow-up top sleeve 8 to rotate to the next oil hole position through the output shaft and is aligned with the drilling power head 15, the oil cylinder 16 is made to drive the driving motor 14 and the drilling power head 15 to move forwards along the horizontal longitudinal movement track 12 until the drilling power head 15 finishes radial drilling of the shaft sleeve, and the operation is repeated until the drilling action of all the oil holes in the shaft sleeve is finished;

then the piston rod 9 of the jacking cylinder 7 retracts to drive the follow-up jacking sleeve 8 to leave the core rod 5, at the moment, the follow-up jacking sleeve 8 loosens the shaft sleeve which is drilled, then the piston rod of the pushing cylinder 21 extends out, the pushing sleeve 20 is synchronously pushed by the mounting plate 22, the push rod 23 and the arc-shaped push plate 24 to move outwards along the axial direction of the core rod 5 until the shaft sleeve is pushed out of the core rod 5, then the piston rod of the pushing cylinder 21 retracts, and the pushing sleeve 20 is synchronously driven to move inwards along the axial direction of the core rod 5 to reset.

The utility model has the advantages that: (1) the shaft sleeve cannot deform during clamping, so that the quality of the shaft sleeve is ensured; (2) need not frequent clamping and dismantlement axle sleeve in the axle sleeve course of working, convenient operation, work efficiency is high, and drilling quality is good, has guaranteed the drilling quality of axle sleeve.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made in accordance with the technical spirit of the present invention are within the scope of the present invention as claimed.

Claims (9)

1. Axle sleeve clamping device in axle sleeve drilling machine includes: the frame, its characterized in that: a servo speed reducing motor is transversely arranged on one side of the rack, a core rod for sleeving the shaft sleeve is coaxially arranged on an output shaft of the servo speed reducing motor, the core rod is in a reducing shape, a step for the shaft sleeve sleeved on the core rod to abut against is formed at the reducing part of the core rod, a circle of drilling avoiding groove is arranged on the outer circumferential wall of the end part of the core rod, and when the shaft sleeve is sleeved in the core rod and abuts against the step, the drilling avoiding groove just corresponds to an annular area to be drilled on the shaft sleeve; the other side of the rack is transversely provided with a jacking cylinder, the outer end part of a piston rod of the jacking cylinder is sleeved with a follow-up jacking sleeve, a plane bearing and a ball bearing are arranged between the follow-up jacking sleeve and the piston rod, the follow-up jacking sleeve can freely and radially rotate relative to the piston rod through the plane bearing and the ball bearing and cannot be axially and movably arranged on the piston rod relative to the piston rod, the follow-up jacking sleeve and a core rod are coaxially and oppositely distributed, the follow-up jacking sleeve can clamp a shaft sleeve in a relatively clamping manner with the core rod under the pushing of the piston rod of the jacking cylinder, and the follow-up jacking sleeve cannot prevent a servo speed reduction motor from driving the clamped shaft sleeve to rotate through.

2. The bushing clamping device in the bushing drilling machine as claimed in claim 1, wherein: the horizontal transverse moving rail is arranged at the front end of the top of the rack in the left-right direction, the mounting frame is arranged on the horizontal transverse moving rail in a sliding mode, the servo speed reducing motor and the jacking cylinder are arranged on the mounting frame in a left-right opposite mode, and the mounting frame moves along the horizontal transverse moving rail under the driving of the transverse moving driving assembly.

3. The bushing clamping device in the bushing drilling machine as claimed in claim 2, wherein: the structure of the traverse driving component comprises: the fixed plate is vertically installed on the rack on the left side or the right side of the mounting frame, the lead screw penetrates through the fixed plate, the lead screw can be radially rotated through the bearing and cannot be axially movably arranged in the fixed plate, the handle is arranged at one end of the lead screw, and the other end of the lead screw penetrates through the mounting frame and is in threaded connection with the mounting frame.

4. The bushing clamping device in the bushing drilling machine according to claim 1, 2 or 3, wherein: the pushing sleeve is sleeved outside the core rod, cannot rotate radially relative to the core rod but can only move axially relative to the core rod, and can move axially outwards along the core rod under the driving of the pushing assembly until the shaft sleeve after drilling pushes out the core rod or moves inwards along the axial direction of the core rod for resetting.

5. The bushing clamping device in the bushing drilling machine as claimed in claim 4, wherein: the structure of pushing equipment includes: the push rod is connected with an arc-shaped push plate positioned in the annular limiting groove, and the arc-shaped push plate cannot prevent the push sleeve from rotating along with the core rod.

6. The bushing clamping device in the bushing drilling machine as claimed in claim 4, wherein: the specific connecting structure of the pushing sleeve and the core rod is as follows: the outer circumferential wall of the core rod is provided with a plurality of axial sliding grooves along the circumferential direction, each axial sliding groove is internally provided with a pin shaft moving along the corresponding axial sliding groove, and each pin shaft is connected and fixed on the material pushing sleeve.

7. The bushing clamping device in the bushing drilling machine as claimed in claim 4, wherein: and the machine frame is provided with a blowing component for blowing and cleaning ash of the shaft sleeve during drilling.

8. The bushing clamping device in the bushing drilling machine as claimed in claim 7, wherein: the structure of jetting subassembly includes: the nozzle is aligned downwards to the nozzle of the drilling avoiding groove on the core rod and is connected with a high-pressure air source through an air pipe.

9. The bushing clamping device in the bushing drilling machine as claimed in claim 4, wherein: and a shaft sleeve drilling correction reticle for aligning the seam on the shaft sleeve is arranged on the outer wall of the core rod.

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