CN111889755A

CN111889755A - Drilling device capable of automatically selecting pre-drilling drill bit

Info

Publication number: CN111889755A
Application number: CN202010808130.3A
Authority: CN
Inventors: 马文冲
Original assignee: Fuzhou Economic And Technological Development Zone Midar Technology Co ltd
Current assignee: Fuzhou Economic And Technological Development Zone Midar Technology Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-11-06

Abstract

The invention discloses a drilling device capable of automatically selecting a pre-drilling drill bit, which comprises a drilling device shell, wherein a working cavity is arranged in the drilling device shell, a horizontal bracket is fixedly arranged on the inner wall of the left side of the working cavity, three rotating shaft brackets are uniformly and fixedly arranged at the upper end of the horizontal bracket from left to right, a pre-drilling assembly is arranged in the working cavity, the pre-drilling assembly comprises a first transmission shaft which is rotatably connected with the left end of the rotating shaft bracket, a first gear which is fixedly arranged on the first transmission shaft, a fixed slideway which is fixedly arranged on the inner wall of the rear side of the working cavity, and a linkage bracket which is arranged at the front end of the fixed slideway and can slide left and right, the invention can automatically select the number and the diameter of the drill bits for pre-drilling according to the diameter of the drill bits which are clamped between clamping rings, and can automatically move a workpiece when drilling is carried out, thereby realizing the pipel, realize the incessant drilling to the work piece, greatly improved the efficiency of work.

Description

Drilling device capable of automatically selecting pre-drilling drill bit

Technical Field

The invention relates to the technical field of drilling machines, in particular to a drilling device capable of automatically selecting a pre-drilling drill bit.

Background

Because of the special role of some workpieces, it is often necessary to drill the workpiece. Generally, when a hole with a larger aperture is drilled, a drill bit with a smaller aperture needs to be used for pre-drilling, the working efficiency is greatly influenced by repeated taking-off and mounting of the drill bit, particularly, when the drill bits with different radii need to be selected, pre-drilling drill bits with different diameters need to be selected, and at the moment, workers need to spend more time for selecting the drill bit.

Disclosure of Invention

The object of the present invention is to provide a drilling device with automatic selection of pre-drilled drill bits, which overcomes the above-mentioned drawbacks of the prior art.

The drilling device capable of automatically selecting the pre-drilling drill bit comprises a drilling device shell, wherein a working cavity is arranged in the drilling device shell, a horizontal support is fixedly arranged on the inner wall of the left side of the working cavity, three rotating shaft supports are uniformly and fixedly arranged at the upper end of the horizontal support from left to right, a pre-drilling assembly is arranged in the working cavity and comprises a first transmission shaft rotatably connected to the left end of the rotating shaft support, a first gear fixedly arranged on the first transmission shaft, a fixed slide fixedly arranged on the inner wall of the rear side of the working cavity, a linkage support arranged at the front end of the fixed slide and capable of sliding left and right, a first spring connected between the linkage support and the rightmost rotating shaft support, a second transmission shaft rotatably connected to the linkage support and extending left and right, and a linkage sector gear fixedly arranged on the second transmission shaft from left to right and capable of being meshed and connected with the corresponding first gear, the radian of the tooth surface of the linkage sector gear is one hundred and eighty degrees, the thickness of the gear of the linkage sector gear is reduced from left to right, a main drilling assembly is further arranged in the working cavity, the main drilling assembly comprises a sliding support plate which is fixedly arranged on the inner wall of the rear side of the working cavity and can slide up and down, a second spring connected between the sliding support plate and the horizontal support, a linkage ring which is rotatably connected with the sliding support plate and extends up and down, a rotating support plate fixedly connected with the upper end of the linkage ring, two clamping rings which are symmetrically connected with the front end of the rotating support plate in a left-right sliding mode, and a clamping ring fixedly arranged at the lower end of the clamping ring, and a transmission assembly is further arranged in the working cavity.

Preferably, a power motor is fixedly arranged on the inner wall of the upper side of the working cavity, and a third transmission shaft is in power connection with the lower end of the power motor.

Wherein, the pre-drilling assembly further comprises three fourth transmission shafts which are connected with the horizontal support in a rotating way from left to right and extend up and down, a first bevel gear is fixedly arranged on the fourth transmission shaft positioned on the upper side of the horizontal support, a second bevel gear which is positioned on the left side of the first bevel gear and is in meshing connection with the first bevel gear is fixedly arranged on the first transmission shaft, three motor sliding supports capable of sliding up and down are arranged on the inner wall of the rear side of the working cavity from left to right, the internal thread part of each motor sliding support is in threaded connection with the thread part on the fourth transmission shaft, a third spring is connected between each motor sliding support and the horizontal support, a pre-drilling motor positioned on the left side of the fourth transmission shaft is fixedly arranged at the lower end of each motor sliding support, a pre-drilling drill bit is dynamically connected at the lower end of each pre-drilling motor, and the radius of the three pre-drilling, a fixed bracket is fixedly arranged at the left end of the fixed slideway, a fifth transmission shaft is rotatably connected at the lower end of the fixed bracket, a rotating wheel is fixedly arranged on the fifth transmission shaft, two centrifugal cavities communicated with the working cavity are arranged in the rotating wheel in a bilateral symmetry manner, a centrifugal slider extending into the working cavity is slidably connected on the inner wall of the centrifugal cavity and can be abutted against the linkage bracket, a fourth spring is connected between the centrifugal slider and one end of the centrifugal cavity close to the symmetry center, a vertical bracket positioned at the left side of the rotating support plate is fixedly arranged at the upper end of the sliding support plate, a horizontal rod is fixedly arranged at the right end of the vertical bracket, a sixth transmission shaft in spline connection with the fifth transmission shaft is rotatably connected at the upper end of the horizontal rod, an L-shaped bracket is fixedly arranged at the upper end of the rotating support plate, and a central rod is fixedly arranged at the position, the upper end of the center rod is fixedly provided with a first belt wheel, a connecting belt is connected between the first belt wheel and the second belt wheel, the inner wall of the left side of the working cavity is rotatably connected with a first rotating shaft which extends rightwards and is in splined connection with the second transmission shaft, the tail end of the right end of the first rotating shaft is fixedly provided with a third bevel gear, and a fourth bevel gear in meshed connection with the third bevel gear is fixedly arranged on the third transmission shaft.

Wherein the main drilling component further comprises an inclined plane limiting block which is arranged at the front end of the rotating support plate in a bilateral symmetry manner and can slide up and down, one end of the inclined plane limiting block, which is close to the symmetry center, can be abutted against the clamping ring, an L-shaped rack is fixedly arranged at one end of the inclined plane limiting block, which is far away from the symmetry center, two second rotating shafts are rotationally connected at the front end of the rotating support plate in a bilateral symmetry manner, a second gear is fixedly arranged on the second rotating shafts, the second gear and a toothed part at one end of the L-shaped rack, which is far away from the symmetry center, are engaged and connected, a fifth bevel gear is fixedly arranged on the second rotating shafts, two fixed blocks are fixedly arranged at the front end of the rotating support plate, a third rotating shaft which extends rightwards to the right side of the fixed block is rotatably connected to the right side of the fixed block at the, a hand wheel is fixedly arranged on the third rotating shaft positioned on the right side of the fixed block, a main drilling motor is fixedly arranged on the inner wall of the rear side of the working cavity, the lower end of the main drilling motor is in power connection with a fourth rotating shaft, a vertical rod positioned on the right side of the rotating support plate is fixedly arranged at the upper end of the sliding support plate, a matching support extending leftwards is fixedly arranged at the upper end of the vertical rod, a fifth rotating shaft in splined connection with the lower end of the fourth rotating shaft is rotatably connected to the upper end of the matching support, a third belt wheel is fixedly arranged on the fifth rotating shaft, a fixed fan-shaped ring is fixedly arranged at the upper end of the clamping ring, and a linkage belt is connected between the third belt wheel and.

Wherein the transmission assembly further comprises a sixth rotating shaft which is rotatably connected to the inner wall of the upper side of the working cavity and extends downwards, a third gear is fixedly arranged on the sixth rotating shaft, a torsion spring is connected between the third gear and the inner wall of the upper side of the working cavity, a matched sector gear which is positioned on the lower side of the fourth bevel gear and is meshed and connected with the third gear is fixedly arranged on the third rotating shaft, the radian of the tooth surface of the matched sector gear is one hundred eighty degrees, a one-way bearing which is positioned on the lower side of the third gear and can only perform one-way transmission is fixedly arranged on the sixth rotating shaft, a seventh bevel gear is fixedly arranged on the outer surface of the one-way bearing, two seventh rotating shafts are rotatably connected on the inner wall of the front side of the working cavity in a bilateral symmetry manner, an eighth bevel gear which is meshed and connected with the seventh bevel gear is fixedly arranged on the seventh rotating shaft on the right side, the side of a left side be connected with driving belt between the fourth band pulley, driving belt surface has set firmly fourteen push rods that extend backward uniformly, working chamber left side inner wall set firmly in extend right to the work rest of working chamber right side inner wall, just be equipped with two grooves of lining up on the work rest, prevent to interfere the transmission of push rod.

The invention has the beneficial effects that: the invention can automatically select the number and the diameter of the drill bits for pre-drilling according to the diameter of the drill bits clamped between the clamping rings, and can automatically move the workpiece during drilling, thereby realizing pipelining of drilling, realizing uninterrupted drilling of the workpiece and greatly improving the working efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view showing the overall construction of a drilling apparatus for automatically selecting a pre-drill bit according to the present invention;

FIG. 2 is a schematic enlarged view of the structure of "A" of FIG. 1;

fig. 3 is a schematic view of the structure in the direction "B-B" of fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-3, for the sake of convenience, the orientations described hereinafter being defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to fig. 1 to 3, a drilling device capable of automatically selecting a pre-drilling drill bit according to an embodiment of the present invention includes a drilling device housing 11, a working chamber 12 is disposed in the drilling device housing 11, a horizontal bracket 26 is fixedly disposed on an inner wall of a left side of the working chamber 12, three rotating shaft brackets 34 are uniformly and fixedly disposed on an upper end of the horizontal bracket 26 from left to right, a pre-drilling assembly 901 is disposed in the working chamber 12, the pre-drilling assembly 901 includes a first transmission shaft 29 rotatably connected to a left end of the rotating shaft bracket 34, a first gear 30 fixedly disposed on the first transmission shaft 29, a fixed slide rail 48 fixedly disposed on an inner wall of a rear side of the working chamber 12, a linkage bracket 35 disposed at a front end of the fixed slide rail 48 and capable of sliding left and right, a first spring 78 connected between the linkage bracket 35 and the right-most rotating shaft bracket 34, a second transmission shaft 31 rotatably connected to the linkage bracket 35 and extending left and right, A linkage sector gear 33 which is fixedly arranged on the second transmission shaft 31 from left to right and can be meshed and connected with the corresponding first gear 30, the radian of the tooth surface of the linkage sector gear 33 is one hundred eighty degrees, the thickness of the gear of the linkage sector gear 33 is reduced from left to right, when the linkage sector gear 33 is meshed and connected with the corresponding first gear 30, the power of the second transmission shaft 31 can be transmitted to the corresponding first transmission shaft 29, a main drilling assembly 902 is further arranged in the working cavity 12, the main drilling assembly 902 comprises a sliding support plate 13 which is fixedly arranged on the inner wall of the rear side of the working cavity 12 and can slide up and down, a second spring 82 which is connected between the sliding support plate 13 and the horizontal support 26, a linkage circular ring 59 which is rotatably connected with the sliding support plate 13 and extends up and down, and a rotating support plate 73 which is fixedly connected with the upper end of the linkage circular ring 59, The two clamping rings 58 are connected to the front end of the rotating support plate 73 in a sliding mode in a bilateral symmetry mode, the clamping rings 58 are fixedly arranged at the lower end of the clamping rings 58, the clamping of a drilling bit is achieved by reducing the distance between the left clamping ring 58 and the right clamping ring 58, the drilling bit can be driven to move downwards when the sliding support plate 13 moves downwards, and a transmission assembly 903 used for conveying a drilling workpiece is further arranged in the working chamber 12.

Beneficially, a power motor 37 is fixedly arranged on the inner wall of the upper side of the working cavity 12, a third transmission shaft 40 is connected to the lower end of the power motor 37 in a power mode, and the third transmission shaft 40 can transmit the power of the power motor 37.

According to the embodiment, the pre-drilling assembly 901 will be described in detail below, the pre-drilling assembly 901 further includes three fourth transmission shafts 24 connected to the horizontal bracket 26 in a rotating manner from left to right and extending up and down, a first bevel gear 27 is fixedly disposed on the fourth transmission shaft 24 located on the upper side of the horizontal bracket 26, a second bevel gear 32 located on the left side of the first bevel gear 30 and engaged with the first bevel gear 27 is fixedly disposed on the first transmission shaft 29, three motor sliding brackets 23 capable of sliding up and down are disposed on the inner wall of the rear side of the working chamber 12 from left to right, an internal thread portion of each motor sliding bracket 23 is in threaded connection with a thread portion of the fourth transmission shaft 24, a third spring 25 is connected between each motor sliding bracket 23 and the horizontal bracket 26, a pre-drilling motor 22 located on the left side of the fourth transmission shaft 24 is fixedly disposed at the lower end of each motor sliding bracket 23, the lower end of the pre-drilling motor 22 is dynamically connected with pre-drilling drill bits 21, the radiuses of three pre-drilling drill bits 21 from left to right are gradually increased, the left end of the fixed slide rail 48 is fixedly provided with a fixed support 45, the lower end of the fixed support 45 is rotatably connected with a fifth transmission shaft 67, a rotating wheel 79 is fixedly arranged on the fifth transmission shaft 67, two centrifugal cavities 44 communicated with the working cavity 12 are arranged in the rotating wheel 79 in a bilateral symmetry manner, the inner wall of each centrifugal cavity 44 is slidably connected with a centrifugal slider 43 extending into the working cavity 12, the centrifugal slider 43 can be abutted against the linkage support 35, a fourth spring 46 is connected between the centrifugal slider 43 and one end, close to the symmetry center, of the centrifugal cavity 44, the upper end of the sliding support plate 13 is fixedly provided with a vertical support 62 positioned on the left side of the rotating support plate 73, and the right end of the vertical support 62 is fixedly, the upper end of the horizontal rod 64 is rotatably connected with a sixth transmission shaft 65 in splined connection with the fifth transmission shaft 67, the upper end of the rotating support plate 73 is fixedly provided with an L-shaped support 47, a center rod 77 is fixedly arranged at the position, close to the rotating center of the clamping ring 58, of the L-shaped support 47, a first belt pulley 76 is fixedly arranged at the upper end of the center rod 77, a connecting belt 75 is connected between the first belt pulley 76 and the second belt pulley 66, the inner wall of the left side of the working cavity 12 is rotatably connected with a first rotating shaft 28 which extends rightwards and is in splined connection with the second transmission shaft 31, the tail end of the right end of the first rotating shaft 28 is fixedly provided with a third bevel gear 36, and a fourth bevel gear 38 which is meshed and connected with the third bevel gear 36 is fixedly.

According to the embodiment, the main drilling assembly 902 is described in detail below, the main drilling assembly 902 further includes a bevel stopper 60 disposed at the front end of the rotating support plate 73 in a left-right symmetrical manner and capable of sliding up and down, and one end of the bevel stopper 60 near the symmetrical center is capable of abutting against the corresponding clamp ring 58, an L-shaped rack 61 is fixedly disposed at one end of the bevel stopper 60 away from the symmetrical center, two second rotating shafts 71 are rotatably coupled to the front end of the rotating support plate 73 in a left-right symmetrical manner, a second gear 57 is fixedly disposed on the second rotating shaft 71, the second gear 57 and a toothed portion of the L-shaped rack 61 at one end away from the symmetrical center are in meshing connection, a fifth bevel gear 70 is fixedly disposed on the second rotating shaft 71, two fixed blocks 63 are fixedly disposed at the front end of the rotating support plate 73, a third rotating shaft 74 extending to the right of the fixed block 63 on the left side is rotatably coupled to the right, a sixth bevel gear 72 which is meshed and connected with the corresponding fifth bevel gear 70 is fixedly arranged on the third rotating shaft 74, a hand wheel 55 is fixedly arranged on the third rotating shaft 74 which is positioned on the right side of the fixed block 63 on the right side, a main drilling motor 80 is fixedly arranged on the inner wall of the rear side of the working cavity 12, the lower end of the main drilling motor 80 is in power connection with a fourth rotating shaft 81, the upper end of the sliding support plate 13 is fixedly provided with a vertical rod 54 positioned at the right side of the rotating support plate 73, the upper end of the vertical rod 54 is fixedly provided with a matching bracket 53 extending leftwards, the upper end of the matching bracket 53 is rotatably connected with a fifth rotating shaft 51 connected with the lower end of the fourth rotating shaft 81 through a spline, a third belt wheel 52 is fixedly arranged on the fifth rotating shaft 51, a fixed sector ring 49 is fixedly arranged at the upper end of the clamping ring 58, and a linkage belt 50 is connected between the third belt wheel 52 and the belt wheel formed by the left and right fixed fan-shaped rings 49.

According to the embodiment, the transmission component 903 is described in detail below, the transmission component 903 further includes a sixth rotating shaft 14 rotatably connected to the inner wall of the upper side of the working chamber 12 and extending downward, a third gear 41 is fixedly disposed on the sixth rotating shaft 14, a torsion spring 39 is connected between the third gear 41 and the inner wall of the upper side of the working chamber 12, a mating sector gear 42 disposed below the fourth bevel gear 38 and engaged with the third gear 41 is fixedly disposed on the third rotating shaft 40, the radian of the tooth surface of the mating sector gear 42 is one hundred eighty degrees, a one-way bearing 16 disposed below the third gear 41 and capable of performing only one-way transmission is fixedly disposed on the sixth rotating shaft 14, a seventh bevel gear 15 is fixedly disposed on the outer surface of the one-way bearing 16, two seventh rotating shafts 20 are rotatably connected to the inner wall of the front side of the working chamber 12 in a left-right symmetric manner, an eighth bevel gear 17 engaged with the seventh bevel gear 15 is fixedly disposed on the seventh rotating shaft 20 on the right side, set firmly fourth band pulley 68 on the seventh pivot 20, the left and right sides be connected with drive belt 19 between the fourth band pulley 68, fourteen push rods 18 that extend backward have set firmly uniformly to drive belt 19 surface, working chamber 12 left side inner wall set firmly extend to the right the work rest 69 of working chamber 12 right side inner wall, just be equipped with two through grooves on the work rest 69, prevent to interfere the transmission of push rod 18.

In the initial state, the centrifugal slider 43 is not abutted against the linkage bracket 35, the linkage bracket 35 is located at the left limit position, the linkage sector gear 33 is meshed with the first gear 30, the matching sector gear 42 is meshed with the third gear 41, the motor sliding bracket 23 is located at the upper limit position, and the sliding support plate 13 is located at the upper limit position.

When a workpiece on the workpiece support 69 needs to be drilled, a worker places the handle of a drill suitable for the final drilling aperture size between the left and right clamping rings 58, rotates the hand wheel 55, the rotating hand wheel 55 drives the third rotating shaft 74 to rotate, the rotating third rotating shaft 74 drives the left and right L-shaped racks 61 to move upwards through the left and right sixth bevel gears 72, the left and right fifth bevel gears 70, the left and right second rotating shafts 71, the left and right second gears 57, the upward moving L-shaped racks 61 drive the clamping rings 58 to move through the bevel limiting blocks 60, the distance between the left and right clamping rings 58 is reduced through the rotating clamping rings 58, so that the drill is clamped, the pre-drilling motor 22 is started to rotate the pre-drilling drill 21, the power motor 37 is started to rotate the third transmission shaft 40, the rotating third transmission shaft 40 drives the fourth bevel gear 38 to rotate in cooperation with the sector gear 42, the main drilling motor 80 is started to rotate the fourth rotating shaft 81, the rotating fourth rotating shaft 81 drives the clamping ring 58 to rotate through the fifth rotating shaft 51, the third belt wheel 52, the linkage belt 50 and the fixed sector ring 49, the rotating speed of the fixed sector ring 49 is different according to the diameter of the clamped drill bit, so that the rotating clamping ring 58 drives the rotating support plate 73 to rotate, the rotating support plate 73 drives the sixth transmission shaft 65 to rotate through the L-shaped bracket 47, the central rod 77, the first belt wheel 76, the connecting belt 75 and the second belt wheel 66, the rotating speed of the sixth transmission shaft 65 is related to the diameter of the clamped drill bit, the rotating sixth transmission shaft 65 drives the rotating wheel 79 to rotate through the fifth transmission shaft 67, so that the centrifugal slide block 43 moves away from the symmetrical center under the action of centrifugal force and drives the linkage bracket 35 to move rightwards, and the rightwards moving speed of the linkage bracket 35 is inversely proportional to the diameter of the clamped drill bit, the fourth spring 46 and the first spring 78 accumulate elastic potential energy, the linkage support 35 moving to the right by a corresponding distance drives the three linkage sector gears 33 to move to the right by a corresponding distance through the second transmission shaft 31, at this time, the first gear 30 meshed and connected with the corresponding linkage sector gear 33 has power transmitted from the linkage sector gear 33, the rotating fourth bevel gear 38 sequentially passes through the third bevel gear 36, the first rotating shaft 28, the second transmission shaft 31, the corresponding linkage sector gear 33, the corresponding first gear 30 and the corresponding first transmission shaft 29 to drive the corresponding second bevel gear 32 to rotate, the rotating second bevel gear 32 drives the corresponding motor sliding support 23 to move downwards through the first bevel gear 27 and the fourth transmission shaft 24, so that the motor sliding support 23 moving downwards drives the rotating pre-drilling drill bit 21 to move downwards through the pre-drilling motor 22 and pre-drill the workpiece on the workpiece support 69, in the process of pre-drilling, the rotating matching sector gear 42 drives the sixth rotating shaft 14 to rotate one hundred eighty degrees through the third gear 41, the torsion spring 39 accumulates elastic potential energy, at this time, the rotating direction of the sixth rotating shaft 14 is different from the transmission direction of the one-way bearing 16, so that the one-way bearing 16 does not transmit at this time, the rotating sixth rotating shaft 14 drives the sliding support plate 13 to move downwards, the second spring 82 accumulates elastic potential energy, so that the clamped drill bit moves downwards, the last hole expanding is performed on the hole site which has been pre-drilled in the front, so as to complete the drilling in accordance with the required hole diameter, along with the continuous rotation of the third transmission shaft 40 and the second transmission shaft 31, when the linking sector gear 33 is not meshed with the first gear 30 any more, the motor sliding support 23 loses the power of moving downwards, the third spring 25 releases the elastic potential energy and drives the motor sliding support 23 to reset upwards, when the matched sector gear 42 is not meshed with the third gear 41 any more, the second spring 82 releases elastic potential energy and drives the sliding support plate 13 to reset upwards, the torsion spring 39 releases elastic potential energy and drives the sixth rotating shaft 14 to rotate reversely and reset through the third gear 41, at this time, the rotating direction of the sixth rotating shaft 14 is the same as the transmission direction of the one-way bearing 16, so that the reversely rotating sixth rotating shaft 14 drives the push rod 18 to transmit through the one-way bearing 16, the seventh bevel gear 15, the eighth bevel gear 17, the right seventh rotating shaft 20, the right fourth belt pulley 68 and the transmission belt 19, the moving push rod 18 drives the workpiece on the workpiece support 69 to transmit rightwards, so that the workpiece after each reaming is moved rightwards or the workpiece after final drilling is moved rightwards, when the machining of the workpiece is completed, all the motors are turned off, the first spring 78 releases elastic potential energy and drives the linkage support 35 to reset leftwards, the fourth spring 46 releases the elastic potential energy and drives the centrifugal slider 43 to reset, the hand wheel 55 is manually screwed, the drill bit is taken down, and the device is restored to the initial state.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a but drilling equipment of automatic selection pre-drilling drill bit, includes the drilling equipment casing, be equipped with the working chamber in the drilling equipment casing, working chamber left side inner wall has set firmly horizontal stand, the horizontal stand upper end has set firmly three pivot support, its characterized in that from a left side to the right side uniformly: the pre-drilling assembly is arranged in the working cavity and comprises a first transmission shaft rotatably connected to the left end of the rotating shaft support, a first gear fixedly arranged on the first transmission shaft, a fixed slide fixedly arranged on the inner wall of the rear side of the working cavity, a linkage support arranged at the front end of the fixed slide and capable of sliding left and right, a first spring connected between the linkage support and the rightmost rotating shaft support, a second transmission shaft rotatably connected to the linkage support and extending left and right, and a linkage sector gear fixedly arranged on the second transmission shaft from left to right and capable of being meshed and connected with the corresponding first gear, wherein the tooth surface radian of the linkage sector gear is one-hundred-eighty degrees, and the thickness of the linkage sector gear is reduced from left to right; the working cavity is also internally provided with a main drilling assembly, the main drilling assembly comprises a sliding support plate which is fixedly arranged on the inner wall of the rear side of the working cavity and can slide up and down, a second spring which is connected between the sliding support plate and the horizontal support, a linkage ring which is rotatably connected with the sliding support plate and extends up and down, a rotating support plate which is fixedly connected with the upper end of the linkage ring, two clamping rings which are symmetrically and slidably connected with the front end of the rotating support plate in a left-right mode, and a clamping ring which is fixedly arranged at the lower end of the clamping ring, and the working cavity is also internally provided with a transmission assembly.

2. A drilling apparatus for automatically selecting a pre-drill bit according to claim 1, wherein: and a power motor is fixedly arranged on the inner wall of the upper side of the working cavity, and the lower end of the power motor is in power connection with a third transmission shaft.

3. A drilling apparatus for automatically selecting a pre-drill bit according to claim 1, wherein: the pre-drilling assembly further comprises three fourth transmission shafts which are rotatably connected with the horizontal support from left to right and extend up and down, a first bevel gear is fixedly arranged on the fourth transmission shaft positioned on the upper side of the horizontal support, a second bevel gear which is positioned on the left side of the first bevel gear and is in meshed connection with the first bevel gear is fixedly arranged on the first transmission shaft, three motor sliding supports capable of sliding up and down are arranged on the inner wall of the rear side of the working cavity from left to right, the internal thread part of each motor sliding support is in threaded connection with the thread part on the fourth transmission shaft, a third spring is connected between each motor sliding support and the horizontal support, a pre-drilling motor positioned on the left side of the fourth transmission shaft is fixedly arranged at the lower end of each motor sliding support, a pre-drilling drill bit is dynamically connected at the lower end of each pre-drilling motor, and the radiuses of the three pre-drilling drill, a fixed bracket is fixedly arranged at the left end of the fixed slideway, a fifth transmission shaft is rotatably connected at the lower end of the fixed bracket, a rotating wheel is fixedly arranged on the fifth transmission shaft, two centrifugal cavities communicated with the working cavity are arranged in the rotating wheel in a bilateral symmetry manner, a centrifugal slider extending into the working cavity is slidably connected on the inner wall of the centrifugal cavity and can be abutted against the linkage bracket, a fourth spring is connected between the centrifugal slider and one end of the centrifugal cavity close to the symmetry center, a vertical bracket positioned at the left side of the rotating support plate is fixedly arranged at the upper end of the sliding support plate, a horizontal rod is fixedly arranged at the right end of the vertical bracket, a sixth transmission shaft in spline connection with the fifth transmission shaft is rotatably connected at the upper end of the horizontal rod, an L-shaped bracket is fixedly arranged at the upper end of the rotating support plate, and a central rod is fixedly arranged at the position, the upper end of the center rod is fixedly provided with a first belt wheel, a connecting belt is connected between the first belt wheel and the second belt wheel, the inner wall of the left side of the working cavity is rotatably connected with a first rotating shaft which extends rightwards and is in splined connection with the second transmission shaft, the tail end of the right end of the first rotating shaft is fixedly provided with a third bevel gear, and a fourth bevel gear in meshed connection with the third bevel gear is fixedly arranged on the third transmission shaft.

4. A drilling apparatus for automatically selecting a pre-drill bit according to claim 1, wherein: the main drilling component also comprises an inclined plane limiting block which is arranged at the front end of the rotating support plate in a bilateral symmetry manner and can slide up and down, one end, close to the symmetry center, of the inclined plane limiting block can be abutted against the clamping ring, an L-shaped rack is fixedly arranged at one end, far away from the symmetry center, of the inclined plane limiting block, two second rotating shafts are connected to the front end of the rotating support plate in a bilateral symmetry manner in a rotating manner, a second gear is fixedly arranged on the second rotating shaft, the second gear and a toothed part, far away from the symmetry center, of the L-shaped rack are meshed and connected, a fifth bevel gear is fixedly arranged on the second rotating shaft, two fixed blocks are fixedly arranged at the front end of the rotating support plate, a third rotating shaft which extends rightwards to the right side of the fixed block is rotatably connected to the right end of the fixed block at the left side, and, a hand wheel is fixedly arranged on the third rotating shaft positioned on the right side of the fixed block, a main drilling motor is fixedly arranged on the inner wall of the rear side of the working cavity, the lower end of the main drilling motor is in power connection with a fourth rotating shaft, a vertical rod positioned on the right side of the rotating support plate is fixedly arranged at the upper end of the sliding support plate, a matching support extending leftwards is fixedly arranged at the upper end of the vertical rod, a fifth rotating shaft in splined connection with the lower end of the fourth rotating shaft is rotatably connected to the upper end of the matching support, a third belt wheel is fixedly arranged on the fifth rotating shaft, a fixed fan-shaped ring is fixedly arranged at the upper end of the clamping ring, and a linkage belt is connected between the third belt wheel and.

5. A drilling apparatus for automatically selecting a pre-drill bit according to claim 1, wherein: the transmission assembly further comprises a sixth rotating shaft which is rotatably connected to the inner wall of the upper side of the working cavity and extends downwards, a third gear is fixedly arranged on the sixth rotating shaft, a torsion spring is connected between the third gear and the inner wall of the upper side of the working cavity, a matched sector gear which is positioned on the lower side of the fourth bevel gear and is in meshed connection with the third gear is fixedly arranged on the third rotating shaft, the radian of the tooth surface of the matched sector gear is one hundred eighty degrees, a one-way bearing which is positioned on the lower side of the third gear and can only perform one-way transmission is fixedly arranged on the sixth rotating shaft, a seventh bevel gear is fixedly arranged on the outer surface of the one-way bearing, two seventh rotating shafts are rotatably connected to the inner wall of the front side of the working cavity in a bilateral symmetry manner, an eighth bevel gear which is in meshed connection with the seventh bevel gear is fixedly arranged on the seventh rotating shaft on the right, the side of a left side be connected with driving belt between the fourth band pulley, driving belt surface has set firmly fourteen push rods that extend backward uniformly, working chamber left side inner wall set firmly in extend right to the work rest of working chamber right side inner wall, just be equipped with two grooves of lining up on the work rest, prevent to interfere the transmission of push rod.