Rotary drilling device

Abstract

The utility model discloses a rotary drilling device which comprises a base, a connecting seat, a mounting seat, a rotary frame, an inner hole drilling mechanism and a drill bit driving mechanism. The connecting base is movably arranged on the base in the X-axis direction. The mounting base is movably arranged on the connecting base in the Z-axis direction, and a rotating mechanism is arranged in the mounting base; the rotating frame is driven by a rotating mechanism to rotate along the mounting seat; the inner hole drilling mechanism comprises a shell, an extension arm, a gear set and a drill bit, the shell is arranged at the bottom of the rotating frame, the extension arm is arranged on the shell, the gear set is arranged in the shell and the extension arm, the drill bit is arranged on the extension arm, and the drill bit is connected with the gear set and driven by the rotating gear set to rotate; the drill bit driving mechanism is arranged on the rotating frame and drives the gear set to rotate. By arranging the base, the connecting base, the rotating base and the drill bit driving mechanism, the position of the inner hole drilling mechanism can be conveniently adjusted, and by arranging the extending arm, a drill bit can conveniently penetrate into the inner side wall of an inner hole to drill.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling processing, in particular to a rotary drilling device. Background Art

[0002] A drilling device is a general term for machinery and equipment that uses a tool that is harder and sharper than the product to be processed to leave a cylindrical hole or hole on the product to be processed through rotary cutting or rotary extrusion.

[0003] When processing some parts, some parts need to be drilled in the inner wall of the inner hole of the parts. When the drilling device in the related art is drilling the inner hole, the internal space of the parts is small, and the processing is difficult. In view of this, the inventor conducted in-depth research on the above defects in the prior art, and thus this case was created. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the utility model aims to provide a rotary drilling device, which facilitates adjusting the position of the inner hole drilling mechanism by providing a base, a connecting seat, a rotating seat and a drill driving mechanism, and facilitates the drill bit to penetrate into the inner wall of the inner hole for drilling by providing an extension arm.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a rotary drilling device, comprising a base, a connecting seat, a mounting seat, a rotating frame, an inner hole drilling mechanism and a drill driving mechanism;

[0006] The connecting seat is movably arranged on the base along the X-axis direction; the mounting seat is movably arranged on the connecting seat along the Z-axis direction, and a rotating mechanism is arranged in the mounting seat; the rotating frame is arranged on the side of the mounting seat, the rotating frame is connected to the rotating mechanism and is driven by the rotating mechanism to rotate along the mounting seat; the inner hole drilling mechanism includes a shell, an extension arm, a gear set and a drill bit, the shell is arranged at the bottom of the rotating frame, the extension arm is arranged on the shell, the gear set is arranged in the shell and the extension arm, the drill bit is arranged on the extension arm, the drill bit is connected to the gear set and is driven to rotate by the rotating gear set; the drill bit driving mechanism is arranged on the rotating frame, and the drill bit driving mechanism drives the gear set to rotate.

[0007] Furthermore, an X-axis driving mechanism is provided on the base to drive the connecting seat to move along the X-axis direction. The X-axis driving mechanism includes a servo motor, a first screw rod and a slide. The servo motor is provided on the base. The first screw rod is rotatably provided on the base. The first screw rod is connected to the servo motor and driven to rotate by the servo motor. The slide is connected to the first screw rod and driven to move along the base by the rotating first screw rod. The connecting seat is provided on the slide.

[0008] Furthermore, a slide rail is arranged on the base, and a slider which slides along the slide rail is arranged at the bottom of the slide platform.

[0009] Furthermore, a Y-axis driving mechanism is provided on the connecting seat to drive the mounting seat to move along the Y-axis direction. The Y-axis driving mechanism includes a driving handwheel, a second screw rod and a moving seat. The driving handwheel is provided on the connecting seat. The second screw rod is rotatably provided on the connecting seat. The second screw rod is connected to the driving handwheel and is driven to rotate by the driving handwheel. The moving seat is connected to the second screw rod and is driven to move along the connecting seat by the rotating second screw rod. The mounting seat is provided on the moving seat.

[0010] Furthermore, a dovetail groove is arranged on the movable seat, and a dovetail protrusion matched with the dovetail groove is arranged on the connecting seat.

[0011] Furthermore, the drill driving mechanism includes a driving motor and a driving shaft. The driving motor is arranged on the rotating frame. The driving shaft is connected to the driving motor and driven to rotate by the driving motor. The driving shaft is connected to the gear set and drives the gear set to rotate.

[0012] Furthermore, the shell includes a first shell and a second shell, the second shell is arranged on the first shell, and the extension arm includes a first extension arm and a second extension arm, the first extension arm is arranged on the first shell, the second extension arm is arranged on the second shell, and the second extension arm is arranged on the first extension arm.

[0013] Furthermore, a driving cavity is formed in the middle of the first shell, and a plurality of positioning shafts are arranged on the first shell and the first extension arm; a plurality of positioning grooves are arranged on the second shell and the second extension arm, and each positioning groove is for inserting a positioning shaft; the gear set includes a first gear, a middle gear and a tail gear, the first gear is arranged on a positioning shaft, the side of the first gear is located in the driving cavity, the middle gear is arranged on the positioning shaft, the middle gear is meshed with the first gear, the tail gear is arranged on the positioning shaft, and the tail gear is meshed with the middle gear; the drill bit is rotatably arranged at the end of the first extension arm, and the drill bit is provided with driving teeth meshed with the tail gear.

[0014] Furthermore, a plurality of positioning axes are distributed in a straight line on the first shell and the first extension arm.

[0015] Furthermore, the distances between two adjacent positioning axes are equal.

[0016] Furthermore, a first mounting hole is provided on the first shell, and a second mounting hole is provided on the second shell, and the second mounting hole corresponds to the first mounting hole.

[0017] Furthermore, a first connecting hole is provided on the first extending arm, and a second connecting hole is provided on the second extending arm, and the second connecting hole corresponds to the first connecting hole.

[0018] Furthermore, a clearance groove is formed on the second shell body and the second extension arm, a positioning groove is arranged at the groove bottom of the clearance groove, and the gear set is located in the clearance groove.

[0019] Furthermore, a through hole is provided at the end of the clearance groove for the drill head to pass through.

[0020] Furthermore, a clearance cavity is formed in the middle of the second shell, and the clearance cavity is arranged opposite to the driving cavity.

[0021] Further, the number of middle gears is five.

[0022] After adopting the above structure, the rotary drilling device involved in the utility model has at least the following beneficial effects:

[0023] First, when in use, the connecting seat moves along the base in the X-axis direction, the mounting seat moves along the connecting seat in the Y-axis direction, and finally the rotating frame rotates along the mounting seat, so as to facilitate the adjustment of the specific position of the inner hole drilling mechanism, so that the inner hole drilling mechanism can perform drilling processing at different positions of the part.

[0024] Second, by setting an extension arm, the extension arm is in the shape of a long strip, so that during processing, the extension arm can penetrate into the inner hole of the part, and the drill bit rotates when the drill bit driving mechanism drives the gear set to rotate, and the drill bit rotates to process the inner wall of the inner hole.

[0025] Third, by setting up an X-axis driving mechanism, when the connecting seat needs to move along the X-axis direction, the servo motor drives the first screw to rotate, and the rotation of the first screw drives the slide to move along the base. The slide moves to realize the movement of the connecting seat, thereby realizing the adjustment of the position of the connecting seat along the X-axis direction.

[0026] Compared with the prior art, the utility model provides a base, a connecting base, a rotating base and a drill driving mechanism. The connecting base moves along the base in the X-axis direction, the mounting base moves along the connecting base in the Y-axis direction, and finally the rotating frame rotates along the mounting base, so as to facilitate the adjustment of the position of the inner hole drilling mechanism. By providing an extension arm, the drill bit can penetrate into the inner wall of the inner hole for drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a rotary drilling device according to an embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of the X-axis driving mechanism according to an embodiment of the utility model;

[0029] Figure 3 It is a structural schematic diagram of the Y-axis driving mechanism according to an embodiment of the utility model;

[0030] Figure 4 It is a structural schematic diagram of an inner hole drilling mechanism according to an embodiment of the utility model;

[0031] Figure 5It is an exploded view of the inner hole drilling mechanism according to an embodiment of the utility model;

[0032] Figure 6 It is a schematic diagram of the connection between the gear set and the first housing according to an embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of the connection between the second shell and the second extension arm according to an embodiment of the utility model.

[0034] Description of symbols

[0035] Base 1, slide rail 11, connecting seat 2, dovetail protrusion 21, mounting seat 3, rotating frame 4, inner hole drilling mechanism 5, shell 51, first shell 511, driving cavity 5111, second shell 512, extension arm 52, first extension arm 521, second extension arm 522, gear set 53, first gear 531, middle gear 532, tail gear 533, drill bit 54, positioning shaft 55, positioning groove 56, make way groove 57, make way cavity 58, drill bit driving mechanism 6, driving motor 61, X-axis driving mechanism 7, servo motor 71, first screw rod 72, slide table 73, slider 731, Y-axis driving mechanism 8, driving hand wheel 81, moving seat 82. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] like Figures 1 to 7 As shown, a rotary drilling device of the utility model comprises a base 1, a connecting base 2, a mounting base 3, a rotating frame 4, an inner hole drilling mechanism 5 and a drill driving mechanism 6; the connecting base 2 is movably arranged on the base 1 along the X-axis direction; the mounting base 3 is movably arranged on the connecting base 2 along the Z-axis direction, and a rotating mechanism is arranged in the mounting base 3; the rotating frame 4 is arranged on the side of the mounting base 3, the rotating frame 4 is connected to the rotating mechanism and is driven by the rotating mechanism to rotate along the mounting base 3; the inner hole drilling mechanism 5 comprises a shell 51, an extension arm 52, a gear set 53 and a drill 54, the shell 51 is arranged at the bottom of the rotating frame 4, the extension arm 52 is arranged on the shell 51, the gear set 53 is arranged in the shell 51 and the extension arm 52, the drill 54 is arranged on the extension arm 52, the drill 54 is connected to the gear set 53 and is driven to rotate by the rotating gear set 53; the drill driving mechanism 6 is arranged on the rotating frame 4, and the drill driving mechanism 6 drives the gear set 53 to rotate.

[0038] Thus, the utility model relates to a rotary drilling device. When in use, the connecting seat 2 moves along the base 1 in the X-axis direction, the mounting seat 3 moves along the connecting seat 2 in the Y-axis direction, and finally the rotating frame 4 rotates along the mounting seat 3, so as to facilitate the adjustment of the specific position of the inner hole drilling mechanism 5, so that the inner hole drilling mechanism 5 can perform drilling processing at different positions of the part. By setting the extension arm 52, the extension arm 52 is in a long strip shape, so that during processing, the extension arm 52 can penetrate into the inner hole of the part, and the drill bit 54 rotates when the drill bit driving mechanism 6 drives the gear set 53 to rotate, and the drill bit 54 rotates to realize the processing of the inner side wall of the inner hole.

[0039] Optionally, an X-axis driving mechanism 7 is provided on the base 1 to drive the connecting seat 2 to move along the X-axis direction. The X-axis driving mechanism 7 includes a servo motor 71, a first screw rod 72 and a slide 73. The servo motor 71 is provided on the base 1, and the first screw rod 72 is rotatably provided on the base 1. The first screw rod 72 is connected to the servo motor 71 and is driven to rotate by the servo motor 71. The slide 73 is connected to the first screw rod 72 and is driven to move along the base 1 by the rotating first screw rod 72. The connecting seat 2 is provided on the slide 73.

[0040] By setting up the X-axis driving mechanism 7, when the connecting seat 2 needs to move along the X-axis direction, the servo motor 71 drives the first screw rod 72 to rotate, and the rotation of the first screw rod 72 drives the slide 73 to move along the base 1. The slide 73 moves to realize the movement of the connecting seat 2, thereby realizing the adjustment of the position of the connecting seat 2 along the X-axis direction.

[0041] A slide rail 11 is arranged on the base 1 , and a slider 731 sliding along the slide rail 11 is arranged at the bottom of the slide table 73 . By arranging the slider 731 and the slide rail 11 , the slide table 73 can move more smoothly.

[0042] Furthermore, a Y-axis driving mechanism 8 is provided on the connecting seat 2 to drive the mounting seat 3 to move along the Y-axis direction. The Y-axis driving mechanism 8 includes a driving handwheel 81, a second screw rod and a moving seat 82. The driving handwheel 81 is provided on the connecting seat 2, and the second screw rod is rotatably provided on the connecting seat 2. The second screw rod is connected to the driving handwheel 81 and is driven to rotate by the driving handwheel 81. The moving seat 82 is connected to the second screw rod and is driven to move along the connecting seat 2 by the rotating second screw rod. The mounting seat 3 is provided on the moving seat 82.

[0043] By setting up the Y-axis driving mechanism 8, when the mounting seat 3 needs to move along the Y-axis direction, force is applied to the driving handwheel 81, so that the driving handwheel 81 can be rotated, and the second screw rod is driven to rotate by the driving handwheel 81. The rotation of the second screw rod drives the moving seat 82 to move along the base 1. The moving seat 82 moves to move the mounting seat 3, thereby realizing the adjustment of the position of the mounting seat 3 along the Y-axis direction.

[0044] Further, a dovetail groove is provided on the movable seat 82, and a dovetail protrusion 21 matching the dovetail groove is provided on the connecting seat 2. By providing the dovetail protrusion 21 and the dovetail groove, the movable seat 82 is limited when moving, preventing the movable seat 82 from detaching from the connecting seat 2.

[0045] In a preferred embodiment of the utility model, the drill driving mechanism 6 includes a driving motor 61 and a driving shaft. The driving motor 61 is arranged on the rotating frame 4. The driving shaft is connected to the driving motor 61 and driven to rotate by the driving motor 61. The driving shaft is connected to the gear set 53 and drives the gear set 53 to rotate.

[0046] When the drill bit 54 needs to rotate, the driving motor 61 drives the driving shaft to rotate. A driving wheel can be set at the end of the driving shaft. The driving shaft drives the driving wheel to rotate. The driving wheel rotates to rotate the gear set 53. The gear set 53 rotates to realize the rotation of the drill bit 54, so that the drill bit 54 can drill the inner hole.

[0047] In a preferred embodiment of the utility model, the shell 51 includes a first shell 511 and a second shell 512, and the second shell 512 is arranged on the first shell 511. The extension arm 52 includes a first extension arm 521 and a second extension arm 522, and the first extension arm 521 is arranged on the first shell 511, and the second extension arm 522 is arranged on the second shell 512, and the second extension arm 522 is arranged on the first extension arm 521.

[0048] During assembly, the gear set 53 is placed in the first shell 511 and the second shell 512, the first shell 511 and the second shell 512 are fixed together by screws, and the first extension arm 521 and the second extension arm 522 are fixed together by screws, thereby completing the assembly of the inner hole drilling mechanism 5.

[0049] In some examples, a driving cavity 5111 is formed in the middle of the first shell 511, and a plurality of positioning shafts 55 are arranged on the first shell 511 and the first extension arm 521; a plurality of positioning grooves 56 are arranged on the second shell 512 and the second extension arm 522, and each positioning groove 56 is for inserting a positioning shaft 55; the gear set 53 includes a first gear 531, a middle gear 532 and a tail gear 533, the first gear 531 is arranged on a positioning shaft 55, and the side of the first gear 531 is located in the driving cavity 5111, the middle gear 532 is arranged on the positioning shaft 55, and the middle gear 532 is meshed with the first gear 531, and the tail gear 533 is arranged on the positioning shaft 55, and the tail gear 533 is meshed with the middle gear 532; the drill bit 54 is rotatably arranged at the end of the first extension arm 521, and the drill bit 54 is provided with driving teeth meshing with the tail gear 533.

[0050] When in use, the inner hole drilling mechanism 5 is arranged on the rotating frame 4, so that the driving shaft of the drill driving mechanism 6 is located in the driving cavity 5111, the driving shaft rotates through the driving wheel to drive the first gear 531 to rotate, the first gear 531 rotates through the middle gear 532 to drive the tail gear 533 to rotate, the tail gear 533 rotates to drive the drill 54 to rotate, and the drill 54 rotates to achieve drilling. When the inner hole needs to be drilled, the inner hole drilling mechanism 5 moves, so that the first extension arm 521 and the second extension arm 522 are inserted into the inner hole, and the drill 54 rotates to drill the inner wall of the inner hole.

[0051] In this example, a plurality of positioning shafts 55 are distributed in a straight line on the first housing 511 and the first extension arm 521. The distance between two adjacent positioning shafts 55 is equal. Since the positioning shafts 55 are distributed in a straight line on the first housing 511 and the first extension arm 521, the distance between two adjacent positioning shafts 55 is equal, the sizes of the first gear 531, the middle gear 532 and the tail gear 533 can be consistent, which facilitates the installation of the first gear 531, the middle gear 532 and the tail gear 533 on different positioning shafts 55, and prevents the gears from being too large and causing the side of the gears to protrude from the first extension arm 521 and the second extension arm 522.

[0052] In a preferred embodiment of the utility model, a first mounting hole is provided on the first housing 511, a second mounting hole is provided on the second housing 512, and the second mounting hole corresponds to the first mounting hole. A first connecting hole is provided on the first extension arm 521, and a second connecting hole is provided on the second extension arm 522, and the second connecting hole corresponds to the first connecting hole.

[0053] By providing the first mounting hole and the second mounting hole, when the first housing 511 is connected to the second housing 512, the gear set 53 is provided on the positioning shaft 55, and then the second housing 512 is placed on the first housing 511, and a fixing member such as a screw is passed through the second mounting hole and the first mounting hole to firmly fix the second housing 512 on the first housing 511. By providing the first connecting hole and the second connecting hole, when the first extension arm 521 is connected to the second extension arm 522, the gear set 53 is provided on the positioning shaft 55, and then the second housing 512 is placed on the first housing 511, so that the second extension arm 522 is placed on the first extension arm 521, and a fixing member such as a screw is passed through the second connecting hole and the first connecting hole to firmly fix the second extension arm 522 on the first connecting hole.

[0054] In this example, a clearance groove 57 is formed on the second housing 512 and the second extension arm 522, a positioning groove 56 is arranged at the bottom of the clearance groove 57, and the gear set 53 is located in the clearance groove 57. A through hole is arranged at the end of the clearance groove 57 for the head of the drill bit 54 to pass through.

[0055] After the second housing 512 is connected to the first housing 511, the gear set 53 is located in the clearance groove 57, so that the gear set 53 is prevented from being exposed to the outside, thereby preventing external dust from entering the gear set 53 and affecting the rotation of the gear set 53. When the second housing 512 is connected to the first housing 511, the head of the drill bit 54 protrudes from the through-hole through the through-hole, so that the head of the drill bit 54 can contact the hole wall of the inner hole of the workpiece to be processed, thereby drilling the hole wall of the inner hole.

[0056] In this example, a clearance cavity 58 is formed in the middle of the second housing 512, and the clearance cavity 58 is arranged opposite to the drive cavity 5111. By setting the clearance cavity 58, it is convenient for the drive shaft to pass through the drive cavity 5111 through the clearance cavity 58, so that the driving wheel on the drive shaft is engaged with the first gear 531, and the driving wheel rotates to drive the first gear 531 to rotate, thereby realizing the rotation of the drill bit 54. In this example, five middle gears 532 are set, and the first gear 531 and the tail gear 533 are both set to one, so that the first extension arm 521 and the second extension arm 522 have a certain length, which is convenient for deep processing in the inner hole. Of course, the middle gear 532 in this example can be set to other numbers according to different inner hole processing positions, such as three, four, six, seven or eight, etc.

[0057] Compared with the prior art, the utility model sets a base 1, a connecting seat 2, a rotating seat and a drill driving mechanism 6. The connecting seat 2 moves along the base 1 in the X-axis direction, the mounting seat 3 moves along the connecting seat 2 in the Y-axis direction, and finally the rotating frame 4 rotates along the mounting seat 3, so as to facilitate the adjustment of the position of the inner hole drilling mechanism 5. By setting an extension arm 52, it is convenient for the drill bit 54 to penetrate into the inner wall of the inner hole for drilling.

[0058] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A rotary drilling device, characterized in that: It includes a base, a connecting seat, a mounting seat, a rotating frame, an inner hole drilling mechanism and a drill driving mechanism; The connecting seat is movably arranged on the base along the X-axis direction; the mounting seat is movably arranged on the connecting seat along the Z-axis direction, and a rotating mechanism is arranged in the mounting seat; the rotating frame is arranged on the side of the mounting seat, the rotating frame is connected to the rotating mechanism and is driven by the rotating mechanism to rotate along the mounting seat; the inner hole drilling mechanism includes a shell, an extension arm, a gear set and a drill bit, the shell is arranged at the bottom of the rotating frame, the extension arm is arranged on the shell, the gear set is arranged in the shell and the extension arm, the drill bit is arranged on the extension arm, the drill bit is connected to the gear set and is driven to rotate by the rotating gear set; the drill bit driving mechanism is arranged on the rotating frame, and the drill bit driving mechanism drives the gear set to rotate.

2. The rotary drilling device according to claim 1, characterized in that: An X-axis driving mechanism for driving the connecting seat to move along the X-axis direction is arranged on the base, and the X-axis driving mechanism includes a servo motor, a first screw rod and a slide. The servo motor is arranged on the base, and the first screw rod is rotatably arranged on the base. The first screw rod is connected to the servo motor and driven to rotate by the servo motor. The slide is connected to the first screw rod and driven to move along the base by the rotating first screw rod. The connecting seat is arranged on the slide.

3. The rotary drilling device according to claim 2, characterized in that: A slide rail is arranged on the base, and a slider which slides along the slide rail is arranged at the bottom of the slide platform.

4. The rotary drilling device according to claim 1, characterized in that: A Y-axis driving mechanism for driving the mounting seat to move along the Y-axis direction is arranged on the connecting seat, and the Y-axis driving mechanism includes a driving handwheel, a second screw rod and a moving seat, the driving handwheel is arranged on the connecting seat, the second screw rod is rotatably arranged on the connecting seat, the second screw rod is connected to the driving handwheel and is driven to rotate by the driving handwheel, the moving seat is connected to the second screw rod and is driven to move along the connecting seat by the rotating second screw rod, and the mounting seat is arranged on the moving seat.

5. The rotary drilling device according to claim 4, characterized in that: A dovetail groove is arranged on the movable seat, and a dovetail protrusion matched with the dovetail groove is arranged on the connecting seat.

6. The rotary drilling device according to claim 1, characterized in that: The drill driving mechanism comprises a driving motor and a driving shaft. The driving motor is arranged on a rotating frame. The driving shaft is connected to the driving motor and driven to rotate by the driving motor. The driving shaft is connected to a gear set and drives the gear set to rotate.

7. The rotary drilling device according to claim 1, characterized in that: The shell includes a first shell and a second shell, the second shell is arranged on the first shell, and the extension arm includes a first extension arm and a second extension arm, the first extension arm is arranged on the first shell, the second extension arm is arranged on the second shell, and the second extension arm is arranged on the first extension arm.

8. The rotary drilling device according to claim 7, characterized in that: A driving cavity is formed in the middle of the first shell, and a plurality of positioning shafts are arranged on the first shell and the first extension arm; a plurality of positioning grooves are arranged on the second shell and the second extension arm, and each positioning groove is for inserting a positioning shaft; the gear set includes a first gear, a middle gear and a tail gear, the first gear is arranged on a positioning shaft, and the side of the first gear is located in the driving cavity, the middle gear is arranged on the positioning shaft, and the middle gear is meshed with the first gear, and the tail gear is arranged on the positioning shaft, and the tail gear is meshed with the middle gear; the drill bit is rotatably arranged at the end of the first extension arm, and the drill bit is provided with driving teeth meshed with the tail gear.

9. The rotary drilling device according to claim 8, characterized in that: A plurality of positioning axes are distributed in a straight line on the first shell and the first extension arm.

10. The rotary drilling device according to claim 8, characterized in that: A clearance groove is formed on the second housing and the second extension arm, a positioning groove is arranged at the bottom of the clearance groove, and the gear set is located in the clearance groove.

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