CN213053755U

CN213053755U - Positioning device for processing center hole of shaft workpiece

Info

Publication number: CN213053755U
Application number: CN202021648662.7U
Authority: CN
Inventors: 常丽梅
Original assignee: Tianjin Juntai Chengshun Machinery Manufacturing Co ltd
Current assignee: Tianjin Juntai Chengshun Machinery Manufacturing Co ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-04-27
Anticipated expiration: 2030-08-10

Abstract

The application relates to a positioner is used in processing of axle type work piece centre bore relates to axle type work piece processing technology field, and it includes: the fixture body is used for fixing the end part of the workpiece and is provided with a positioning hole; the guide rod is arranged on the clamp body, and the axis of the guide rod is parallel to the axis of the positioning hole; the sliding body is arranged on the guide rod in a sliding manner; the clamping ring is arranged at the end part of the sliding body far away from the guide rod and is used for clamping and fixing the end part of the drilling machine; the distance between the axes of the clamping ring and the positioning hole is equal to that between the axes of the guide rod, after the fixture body is fixed on the workpiece, the axes of the positioning hole are overlapped with the axes of the workpiece, and when the sliding body is pushed to move along the guide rod, a drill rod of the drilling machine penetrates through the positioning hole to drill the end face of the workpiece. This application has that drilling stability is strong, the high effect of machining precision.

Description

Positioning device for processing center hole of shaft workpiece

Technical Field

The application relates to the technical field of shaft workpiece machining, in particular to a positioning device for machining a center hole of a shaft workpiece.

Background

After rough turning, the shaft workpiece needs to be provided with a center hole on the end surface, and the shaft workpiece is conveniently clamped through the center hole in subsequent processing.

When the center hole of the workpiece is machined, if the workpiece is fixed on a machine tool, the workpiece needs to be lifted and then installed on a clamp of the machine tool every time, then the position of a drilling machine is adjusted to drill the workpiece, the whole process is very complicated, and a large amount of manpower and material resources need to be consumed, so that in actual production and manufacturing, in order to reduce the working intensity, a mode of manually holding the drilling machine to drill holes is mostly adopted.

However, the inventor finds that when the drilling machine is manually held to drill a hole, the drill rod cannot be fed along the axis direction of the workpiece all the time in the drilling process, and the drill rod is easy to shake in the drilling process, so that the drill rod deviates from the axis of the workpiece and affects the machining precision.

SUMMERY OF THE UTILITY MODEL

In order to improve the stability of drilling, this application provides a shaft type positioner is used in work-piece centre bore processing.

The application provides a shaft type is positioner for work centre bore processing adopts following technical scheme:

the utility model provides a shaft type is positioner for work centre bore processing, includes:

the fixture body is used for fixing the end part of the workpiece and is provided with a positioning hole;

the guide rod is arranged on the clamp body, and the axis of the guide rod is parallel to the axis of the positioning hole;

the sliding body is arranged on the guide rod in a sliding manner; and

the clamping ring is arranged at the end part of the sliding body far away from the guide rod and is used for clamping and fixing the end part of the drilling machine;

the distance between the axes of the clamping ring and the positioning hole is equal to that between the axes of the guide rod, after the fixture body is fixed on the workpiece, the axes of the positioning hole are overlapped with the axes of the workpiece, and when the sliding body is pushed to move along the guide rod, a drill rod of the drilling machine penetrates through the positioning hole to drill the end face of the workpiece.

By adopting the technical scheme, before drilling operation, the end part of the drilling machine firstly passes through the clamping ring, and the clamping ring fixes the cylindrical body; and then fixedly mounting the fixture body at the end part of the workpiece, controlling the drilling machine to work, rotating the drill rod, pushing the drilling machine, and linearly moving the drilling machine and the sliding body along the axial direction of the guide rod until the top end of the drill rod abuts against the end surface of the workpiece, continuously pushing the drilling machine, drilling the workpiece by the drill rod in the process, reversely pulling the drilling machine after drilling to a specified depth, reversely moving the drilling machine and the sliding body along the guide rod, separating from the workpiece, and stopping the drilling machine. In the process, due to the guiding effect of the guide rod, the drill rod moves linearly along the axis direction of the workpiece all the time, the drill rod cannot deviate from the axis of the workpiece in the drilling process, the stability of the drilling process is improved, and meanwhile, the machining precision is also improved.

Preferably, the clamping ring comprises a first ring body and a second ring body which are fixed on the sliding body, a locking bolt arranged on the first ring body and a locking nut which is in threaded connection with the locking bolt;

and the first ring body and the second ring body form a closed space after being closed, and the closed space is used for fixing the end part of the drilling machine.

Through adopting above-mentioned technical scheme, during the installation drilling machine, pass the tip of drilling machine between first ring body and the second ring body, correspond the cylindricality body and place between first ring body and second ring body, then the lock mother of screwing, the side surface laminating of first ring body and second ring body and cylindricality body holds the cylindricality body tightly, and the drilling machine can be fixed.

Preferably, the clamp body comprises a three-jaw chuck and clamping parts respectively fixed on three jaws of the three-jaw chuck;

the clamping part comprises a clamping arm fixed on a jaw of the three-jaw chuck and a clamping rod fixed at one end of the clamping arm far away from the center of the three-jaw chuck;

the clamping arm is arranged along the radial direction of the three-jaw chuck, and the clamping rod is perpendicular to the clamping arm.

Through adopting above-mentioned technical scheme, remove through control three-jaw chuck jack catch, can adjust the distance between three supporting rod and the locating hole, and jack catch synchronous motion, three supporting rod synchronous motion, consequently the distance between every supporting rod and the locating hole axis all equals all the time, when adjusting three supporting rod synchronous to middle removal, the side surface of supporting rod can support tightly on the side surface of work piece, presss from both sides the work piece tightly.

Preferably, a plurality of groups of grooves are formed in the surface of one side, close to the positioning hole, of the clamping rod at intervals.

Through adopting above-mentioned technical scheme, behind the clamping rod presss from both sides tight the fixing on the side surface of work piece, because the setting of recess, can increase the frictional force between clamping rod side surface and the work piece side surface to avoid the relative work piece slippage of clamping rod as far as possible.

Preferably, the method further comprises the following steps:

the fixing body is fixedly arranged on the guide rod and is positioned at one end of the sliding body, which is far away from the clamp body;

one end of the first connecting rod is hinged with the end part of the fixed body close to the guide rod, and the other end of the first connecting rod extends out towards one side far away from the guide rod; and

one end of the second connecting rod is hinged with the end part of the sliding body far away from the guide rod, and the other end of the second connecting rod is hinged with the first connecting rod;

the first connecting rod and the second connecting rod are located on the same side of the guide rod, and the sliding body can be driven to move axially along the guide rod by rotating the first connecting rod.

By adopting the technical scheme, when the first connecting rod is rotated, the included angle between the first connecting rod and the second connecting rod is changed, the first connecting rod drives the second connecting rod to swing, and the second connecting rod pushes the sliding body to slide along the axial direction of the guide rod, so that the feeding of the drill rod is realized; in the actual drilling process, one hand holds the end part of the drilling machine, and the other hand rotates the first connecting rod to control the drilling machine to move, so that the operation is more convenient, and the first connecting rod is used as a force arm, so that the drilling machine is pushed and pulled to a certain extent more labor-saving.

Preferably, a spring is arranged between the fixed body and the sliding body;

the central line of the spring is parallel to the axis of the guide rod, one end of the spring is connected with the fixed body, and the other end of the spring is connected with the sliding body.

By adopting the technical scheme, the spring is in a natural extension state under the non-working state, and the distance between the fixed body and the sliding body is minimum; when the drill rod is required to be controlled to feed to one side of a workpiece, the first connecting rod is rotated to control the sliding body and the drilling machine to move along the guide rod, the spring is stretched in the process, the drill rod is slowly fed, and the spring gives a reverse thrust to a hand of a person and is convenient to control the feeding speed; after the drilling machine drills to a specified depth, the first connecting rod is loosened, the sliding body moves reversely along the guide rod under the action of the elastic force of the spring, the drill rod automatically withdraws from the drilled central hole, and then the drilling machine is closed to prevent the drill rod from being clamped in the central hole. Through the cooperation of spring, first connecting rod and second connecting rod, be convenient for more control the reciprocal feeding of drilling rod, under normal condition, the slider links to each other with the fixed body moreover, can fix the slider in the specific position of guide bar, is about to fix a position the initial position of slider and drilling machine, prevents that slider and drilling machine from rocking along the guide bar axial.

Preferably, a first accommodating groove is formed in the sliding body, a second accommodating groove is formed in the fixed body, and openings on one sides of the first accommodating groove and the second accommodating groove are arranged oppositely;

one end of the spring is fixedly connected with the bottom of the first accommodating groove, and the other end of the spring is fixedly connected with the bottom of the second accommodating groove.

By adopting the technical scheme, the spring is always in a stretching state, the fixed body is tightly attached to the sliding body under the action of the elastic force of the spring, and the fixed body can be separated from the sliding body only when the first connecting rod is rotated; the spring is arranged in the first accommodating groove and the second accommodating groove, so that the fixed body and the sliding body can be tightly attached under a normal state, the space occupied by the fixed body and the sliding body in the axial direction on the guide rod is reduced, and the connection compactness among all parts of the whole device is enhanced.

Preferably, the end of the first link, which is far away from the guide rod, is provided with a holding part.

By adopting the technical scheme, the comfort level of the hands of the person is enhanced.

Preferably, a sleeve is arranged at the edge of one side of the fixture body, which is far away from the positioning hole, the axis of the sleeve is parallel to the axis of the positioning hole, and the guide rod is arranged in the sleeve in a sliding manner;

and the sleeve is in threaded connection with a fastening bolt, and the fastening bolt penetrates through the wall of the sleeve and then abuts against the guide rod.

Through adopting above-mentioned technical scheme, because the model of drilling machine or the length of drilling rod difference among the practical application, slide the guide bar and set up in the sleeve and fixed through fastening bolt, conveniently adjust the distance of sliding body and stationary phase for the anchor clamps body terminal surface according to actual conditions to adaptation drilling machine or drilling rod.

In summary, the present application includes at least one of the following beneficial technical effects:

1. before drilling operation, firstly, the end part of a drilling machine penetrates through a clamping ring, and the clamping ring fixes a cylindrical body; and then fixedly mounting the fixture body at the end part of the workpiece, controlling the drilling machine to work, rotating the drill rod, pushing the drilling machine, and linearly moving the drilling machine and the sliding body along the axial direction of the guide rod until the top end of the drill rod abuts against the end surface of the workpiece, continuously pushing the drilling machine, drilling the workpiece by the drill rod in the process, reversely pulling the drilling machine after drilling to a specified depth, reversely moving the drilling machine and the sliding body along the guide rod, separating from the workpiece, and stopping the drilling machine. In the process, due to the guiding effect of the guide rod, the drill rod moves linearly along the axis direction of the workpiece all the time, the drill rod cannot deviate from the axis of the workpiece in the drilling process, the stability of the drilling process is improved, and meanwhile, the machining precision is also improved.

2. Through the cooperation of spring, first connecting rod and second connecting rod, be convenient for more control the reciprocal feeding of drilling rod, under normal condition, the slider links to each other with the fixed body moreover, can fix the slider in the specific position of guide bar, is about to fix a position the initial position of slider and drilling machine, prevents that slider and drilling machine from rocking along the guide bar axial.

Drawings

Fig. 1 is a schematic view of the structure of a drill rig.

Fig. 2 is a schematic overall structure diagram according to an embodiment of the present application.

Fig. 3 is a schematic view of fig. 2 from another perspective.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

In the figure, 1, a clamp body; 11. positioning holes; 12. a three-jaw chuck; 13. a clamping portion; 131. a clamp arm; 132. a clamping rod; 133. a groove; 14. a sleeve; 15. fastening a bolt; 2. a guide bar; 3. a sliding body; 31. a first accommodating groove; 4. a clamp ring; 41. a first ring body; 42. a second ring body; 43. locking the bolt; 44. locking a nut; 51. a fixed body; 52. a first link; 53. a second link; 54. a spring; 55. a second accommodating groove; 56. a grip portion; 61. a body portion; 62. a drill bit; 63. a drill stem; 64. a cylindrical body; 7. and (4) hooking.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1, first, a structure of a drilling machine, which includes a main body portion 61, a drill 62 rotatably provided on the main body portion 61, and a drill rod 63 mounted on the drill 62, wherein the drill 62 is controlled to rotate by the main body portion 61, and the drill rod 63 drills a workpiece; wherein a cylindrical body 64 is machined into the end of the body portion 61 near the drill 62.

Referring to fig. 2 and 3, a positioning device for processing a central hole of an axial workpiece disclosed in an embodiment of the present application includes a clamp body 1, a guide rod 2, a sliding body 3, and a clamp ring 4.

The fixture body 1 is fixedly arranged at the end part of a workpiece, a positioning hole 11 is formed in the fixture body 1, after the fixture body 1 is arranged on the workpiece, the axis of the positioning hole 11 is overlapped with the axis of the workpiece, and a drill rod 63 of a drilling machine can penetrate through the positioning hole 11 to abut against the end face of the workpiece; the guide rod 2 is fixedly arranged on the clamp body 1, and the axis of the guide rod 2 is parallel to the axis of the positioning hole 11; the sliding body 3 is a square body, a hole matched with the guide rod 2 is formed in the sliding body 3, and the sliding body 3 is arranged on the guide rod 2 in a sliding mode; the clamping ring 4 is fixedly arranged on one side surface of the sliding body 3 far away from the guide rod 2, and after the cylindrical body 64 is arranged in the clamping ring 4 in a penetrating mode, the cylindrical body 64 can be fixed through adjusting the clamping ring 4.

It should be noted that the distance between the axis of the clamping ring 4 and the axis of the guide rod 2 is equal to the distance between the positioning hole 11 and the guide rod 2, and after the drilling machine is installed on the clamping ring 4, the axis of the drill rod 63 just coincides with the axis of the workpiece.

Before the drilling operation, the end of the drilling machine is firstly passed through the clamping ring 4, and the cylindrical body 64 is fixed by the clamping ring 4; and then fixedly mounting the fixture body 1 at the end part of the workpiece, controlling the drilling machine to work, rotating the drill rod 63, pushing the drilling machine, linearly moving the drilling machine and the sliding body 3 along the axial direction of the guide rod 2 until the top end of the drill rod 63 abuts against the end surface of the workpiece, continuously pushing the drilling machine, drilling the workpiece by the drill rod 63 in the process, pulling the drilling machine reversely after drilling to a specified depth, reversely moving the drilling machine and the sliding body 3 along the guide rod 2, separating from the workpiece, and stopping the drilling machine. In the process, due to the guiding effect of the guide rod 2, the drill rod 63 always moves linearly along the axis direction of the workpiece, the drill rod 63 cannot deviate from the axis of the workpiece in the drilling process, the stability of the drilling process is improved, and meanwhile, the machining precision is also improved.

The fixture body 1 comprises a three-jaw chuck 12 and a clamping part 13, a positioning hole 11 is arranged along the axis of the three-jaw chuck 12, and the clamping part 13 is fixedly connected to three jaws of the three-jaw chuck 12; wherein, each clamping portion 13 includes a clamping arm 131 radially disposed along the three-jaw chuck 12 and a clamping rod 132 fixed at an end of the clamping arm 131 far away from the positioning hole 11, and the clamping rod 132 is perpendicular to the clamping arm 131 and extends out toward a side far away from the sliding body 3. Through the control three-jaw chuck 12 jack catch removal, can adjust the distance between three supporting rod 132 and the locating hole 11, and the jack catch synchronous motion, three supporting rod 132 synchronous motion, consequently every supporting rod 132 all equals all the time with the distance between the locating hole 11 axis, when adjusting three supporting rod 132 and move to the centre in step, the side surface of supporting rod 132 can support tightly on the side surface of work piece, presss from both sides the work piece tightly.

Referring to fig. 3 and 4, a groove 133 is further formed on a surface of one side of the clamping rod 132 close to the positioning hole 11, and the groove 133 is specifically in a strip shape, and a plurality of groups are arranged at intervals along the axial direction of the positioning hole 11. After the clamping bars 132 are clamped and fixed on the side surfaces of the workpiece, the friction force between the side surfaces of the clamping bars 132 and the side surfaces of the workpiece can be increased due to the provision of the grooves 133, thereby preventing the clamping bars 132 from slipping off the workpiece as much as possible.

Referring to fig. 2 and 3, the clip ring 4 includes a first ring body 41, a second ring body 42, a locking bolt 43, and a locking nut 44. The first ring body 41 and the second ring body 42 are both made of flexible metal sheets, the first ring body 41 and the second ring body 42 are both fixedly connected to the sliding body 3, and openings of the first ring body 41 and the second ring body 42 are oppositely arranged; locking bolt 43 wears to establish on first ring body 41, the tip that first ring body 41 and second ring body 42 kept away from sliding body 3 all offer with the hole of locking bolt 43 adaptation, locking bolt 43 passes first ring body 41 and second ring body 42 in proper order, the end of locking nut 44 threaded connection at locking bolt 43, can press from both sides the tip of first ring body 41 and second ring body 42 when rotating locking nut 44 tightly, form the space that is used for holding drilling machine cylinder 64 between first ring body 41 and the second ring body 42. When the drilling machine is installed, the end part of the drilling machine penetrates through the space between the first ring body 41 and the second ring body 42, the cylindrical body 64 is correspondingly placed between the first ring body 41 and the second ring body 42, then the locking nut 44 is screwed, the first ring body 41 and the second ring body 42 are attached to the side surface of the cylindrical body 64, the cylindrical body 64 is held tightly, and the drilling machine is fixed.

It should be understood that, in the present application, the first ring body 41 and the second ring body 42 can also be hinged to the sliding body 3, when the first ring body 41 and the second ring body 42 are opened by rotating to both sides, a drilling machine is placed between the first ring body 41 and the second ring body 42, and then the first ring body 41 and the second ring body 42 are fixed by the locking bolt 43, which facilitates the installation and the disassembly of the drilling machine.

Referring to fig. 2 and 3, a fixing body 51 is further fixedly arranged on the guide rod 2, the fixing body 51 is positioned on one side of the sliding body 3 away from the clamp body 1, and two side surfaces of the fixing body 51 are flush with two side surfaces of the sliding body 3; one end of one side surface of the fixed body 51 close to the guide rod 2 is hinged with a first connecting rod 52, one end of one side surface of the sliding body 3 far away from the guide rod 2 is hinged with a second connecting rod 53, the first connecting rod 52 and the second connecting rod 53 are positioned on the same side of the guide rod 2, and the free end of the second connecting rod 53 is hinged with the second connecting rod 53. When the first connecting rod 52 is rotated, the included angle between the first connecting rod 52 and the second connecting rod 53 is changed, the first connecting rod 52 drives the second connecting rod 53 to swing, and the second connecting rod 53 pushes the sliding body 3 to slide along the axial direction of the guide rod 2, so that the feeding of the drill rod 63 is realized; in the actual drilling process, one hand holds the end part of the drilling machine, and the other hand rotates the first connecting rod 52 to control the drilling machine to move, so that the operation is more convenient, and the first connecting rod 52 is used as a force arm, so that the drilling machine is pushed and pulled to a certain extent more conveniently.

The end part of the first connecting rod 52 far away from the guide rod 2 is further fixed with a holding part 56, the surface of the holding part 56 can be arranged to be an arc surface matched with the hand of a person, the comfort degree of the hand of the person is enhanced, the holding part 56 can also be arranged to be made of rubber, the friction force between the hand of the person and the first connecting rod 52 is increased, and the hand slippage is prevented when the first connecting rod 52 is rotated.

Further, a spring 54 is fixedly connected between the opposite end surfaces of the fixed body 51 and the sliding body 3, and specifically, the center line of the spring 54 is parallel to the axis of the guide bar 2. In the non-operating state, the spring 54 is in a natural extension state, and the distance between the fixed body 51 and the sliding body 3 is minimum; when the drill rod 63 needs to be controlled to feed to one side of a workpiece, the first connecting rod 52 is rotated to control the sliding body 3 and the drilling machine to move along the guide rod 2, in the process, the spring 54 is stretched, the drill rod 63 is slowly fed, and the spring 54 gives a reverse thrust to a human hand, so that the feeding speed is convenient to control; after drilling to a specified depth, the first connecting rod 52 is loosened, the sliding body 3 moves reversely along the guide rod 2 due to the elastic force of the spring 54, the drill rod 63 automatically withdraws from the drilled central hole, and then the drilling machine is closed to prevent the drill rod 63 from being stuck in the central hole. Through the cooperation of the spring 54, the first connecting rod 52 and the second connecting rod 53, the reciprocating feeding of the drill rod 63 is more conveniently controlled, and in a normal state, the sliding body 3 is connected with the fixing body 51, so that the sliding body 3 can be fixed at a specific position of the guide rod 2, namely, the initial positions of the sliding body 3 and the drilling machine are positioned, and the sliding body 3 and the drilling machine are prevented from axially shaking along the guide rod 2.

The first receiving groove 31 is formed in the sliding body 3, the second receiving groove 55 is formed in the fixed body 51, it should be noted that the first receiving groove 31 is respectively communicated with two side surfaces adjacent to the sliding body 3, the second receiving groove 55 is respectively communicated with two side surfaces adjacent to the fixed body 51, one opening of the first receiving groove 31 and one opening of the second receiving groove 55 are oppositely arranged, the bottom surfaces of the first receiving groove 31 and the second receiving groove 55 are both fixedly connected with the hook ring 7, and two ends of the spring 54 are respectively hooked on the hook ring 7.

The spring 54 is always in a stretching state, the fixed body 51 is tightly attached to the sliding body 3 under the action of the elastic force of the spring 54, and the fixed body 51 can be separated from the sliding body 3 only when the first connecting rod 52 is rotated; the spring 54 is arranged in the first accommodating groove 31 and the second accommodating groove 55, so that the fixed body 51 and the sliding body 3 can be tightly attached in a normal state, the space occupied by the fixed body 51 and the sliding body 3 in the axial direction of the guide rod 2 is reduced, and the connection compactness of all parts of the whole device is enhanced.

Referring to fig. 2 and 3, a sleeve 14 is fixedly connected to the outer edge of the clamp body 1, the axis of the sleeve 14 is parallel to the axis of the positioning hole 11, both ends of the sleeve 14 are open, and the guide rod 2 is inserted into the sleeve 14 and can slide along the axial direction of the sleeve 14. The wall of the sleeve 14 is connected with a fastening bolt 15 in a threaded manner, and the fastening bolt 15 can penetrate through the wall of the sleeve 14 and is abutted against the guide rod 2.

Due to the fact that the models of the drilling machine or the length of the drill rod 63 in practical application are different, the guide rod 2 is arranged in the sleeve 14 in a sliding mode and is fixed through the fastening bolt 15, and the distance between the sliding body 3 and the fixing body 51 relative to the end face of the clamp body 1 can be adjusted conveniently according to practical conditions so as to adapt to the drilling machine or the drill rod 63.

In addition, the guide rod 2 can also rotate relative to the sleeve 14, so that the sliding body 3 and the fixed body 51 can be moved away from the upper part of the clamp body 1, and the drilling machine is more convenient to install.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. Axle type is positioner for work piece centre bore processing, its characterized in that includes:

the fixture body (1) is used for being fixed at the end part of a workpiece and is provided with a positioning hole (11);

the guide rod (2) is arranged on the clamp body (1), and the axis of the guide rod is parallel to the axis of the positioning hole (11);

the sliding body (3) is arranged on the guide rod (2) in a sliding manner; and

the clamping ring (4) is arranged at the end part of the sliding body (3) far away from the guide rod (2) and is used for clamping and fixing the end part of the drilling machine;

the distance between the axes of the clamping ring (4) and the positioning hole (11) is equal to that between the axes of the guide rod (2), after the clamp body (1) is fixed on a workpiece, the axes of the positioning hole (11) are overlapped with the axes of the workpiece, and when the sliding body (3) is pushed to move along the guide rod (2), a drill rod of a drilling machine penetrates through the positioning hole (11) to drill the end face of the workpiece.

2. The positioning device for processing the central hole of the shaft workpiece according to claim 1, which is characterized in that: the clamping ring (4) comprises a first ring body (41) and a second ring body (42) which are fixed on the sliding body (3), a locking bolt (43) arranged on the first ring body (41) and a locking nut (44) which is in threaded connection with the locking bolt (43);

the first ring body (41) and the second ring body (42) form a closed space after being closed, and the closed space is used for fixing the end part of the drilling machine.

3. The positioning device for processing the central hole of the shaft workpiece according to claim 1, which is characterized in that: the clamp body (1) comprises a three-jaw chuck (12) and clamping parts (13) which are respectively fixed on three jaws of the three-jaw chuck (12);

the clamping part (13) comprises a clamping arm (131) fixed on a jaw of the three-jaw chuck (12) and a clamping rod (132) fixed at one end, far away from the center of the three-jaw chuck (12), of the clamping arm (131);

the clamping arm (131) is arranged along the radial direction of the three-jaw chuck (12), and the clamping rod (132) is perpendicular to the clamping arm (131).

4. The positioning device for processing the central hole of the shaft workpiece according to claim 3, which is characterized in that: and a plurality of groups of grooves (133) are formed on the surface of one side of the clamping rod (132) close to the positioning hole (11) at intervals.

5. The positioning device for processing the central hole of the shaft workpiece according to claim 1, further comprising:

the fixed body (51) is fixedly arranged on the guide rod (2) and is positioned at one end of the sliding body (3) far away from the clamp body (1);

one end of the first connecting rod (52) is hinged with the end part of the fixed body (51) close to the guide rod (2), and the other end of the first connecting rod extends out towards one side far away from the guide rod (2); and

one end of the second connecting rod (53) is hinged with the end part of the sliding body (3) far away from the guide rod (2), and the other end of the second connecting rod is hinged with the first connecting rod (52);

the first connecting rod (52) and the second connecting rod (53) are located on the same side of the guide rod (2), and the sliding body (3) can be driven to axially move along the guide rod (2) by rotating the first connecting rod (52).

6. The positioning device for processing the central hole of the shaft workpiece according to claim 5, wherein: a spring (54) is arranged between the fixed body (51) and the sliding body (3);

the center line of the spring (54) is parallel to the axis of the guide rod (2), one end of the spring (54) is connected with the fixed body (51), and the other end of the spring is connected with the sliding body (3).

7. The positioning device for processing the central hole of the shaft workpiece according to claim 6, which is characterized in that: a first accommodating groove (31) is formed in the sliding body (3), a second accommodating groove (55) is formed in the fixed body (51), and openings on one sides of the first accommodating groove (31) and the second accommodating groove (55) are arranged oppositely;

one end of the spring (54) is fixedly connected with the bottom of the first accommodating groove (31), and the other end of the spring is fixedly connected with the bottom of the second accommodating groove (55).

8. The positioning device for processing the central hole of the shaft workpiece according to claim 5, wherein: the end part of the first connecting rod (52) far away from the guide rod (2) is provided with a holding part (56).

9. The positioning device for processing the central hole of the shaft workpiece according to any one of claims 5 to 8, wherein: a sleeve (14) is arranged on the edge of one side, away from the positioning hole (11), of the fixture body (1), the axis of the sleeve (14) is parallel to the axis of the positioning hole (11), and the guide rod (2) is arranged in the sleeve (14) in a sliding mode;

the sleeve (14) is in threaded connection with a fastening bolt (15), and the fastening bolt (15) penetrates through the wall of the sleeve (14) and then abuts against the guide rod (2).