Automatic drilling device for numerical control lathe

Abstract

The application relates to the technical field of lathe drilling, in particular to a numerical control lathe automatic drilling device, which comprises a radial drilling machine, a stand, a swing arm, a main shaft box, a main shaft sleeve, a main shaft, a connecting sleeve, a first connecting frame and a limiting wheel. The numerical control lathe automatic drilling device can accurately adjust the limiting wheel from the vertical state to the reverse inclination through the meshing transmission of the fan-shaped tooth ring and the first tooth plate, can offset the self-rotation trend of the drill bit through the tangential friction force, can prevent loosening and falling, can enhance the clamping reliability, can drive the directional rolling of the limiting wheel to apply the reverse rotation torque through the cooperation between the inner shaft convex block of the rolling assembly and the spiral groove of the limiting wheel, can offset the self-rotation trend of the cutting, can realize the dynamic compensation in the inclined state through the sliding cooperation between the arc-shaped end surface of the inner shaft and the arc-shaped block, can reduce the machining error and the workpiece damage, and can improve the drilling precision.

Description

Technical Field

[0001] The invention relates to the technical field of lathe drilling, and in particular to an automatic drilling device for a numerically controlled lathe. Background Art

[0002] At present, in the mechanical processing industry, radial drilling machines are a type of machine tool used for hole processing of large parts with multiple holes in single or batch production. Generally, the spindle box can move on the rocker arm and rotate around the column with the rocker arm. The rocker arm moves up and down along the column to adapt to the processing of workpieces of different heights. Smaller workpieces are installed on the workbench, and larger workpieces are directly placed on the machine tool base or on the ground.

[0003] A radial drilling machine, also known as a radial drill, is a hole processing equipment that can be used for various forms of processing such as drilling, reaming, boring, tapping, and scraping end faces. According to the clamping structure of the machine tool, radial drilling machines can be divided into hydraulic radial drilling machines and mechanical radial drilling machines. Specifically, a radial drilling machine is a drilling machine in which the radial arm can rotate and rise and fall around the column, and usually the spindle box moves horizontally on the radial arm.

[0004] The drill bit of a radial drilling machine achieves cutting through high-speed rotation (main motion), which is the fundamental principle of drilling. The drill bit's rotation is driven by a motor within the spindle box. This power is transmitted to the spindle via a transmission mechanism (such as a belt or gears), driving the drill bit's rotation. This process is fundamental to drilling machine design, and all drilling operations rely on the drill bit's rotation to remove material.

[0005] However, during the drilling operation of a radial drilling machine, the main motion of the drill bit rotating around its own axis is the core action to achieve cutting processing. However, in actual working conditions, when the drill bit edge and the workpiece surface are not in sufficient contact due to positioning deviation, workpiece deformation or vibration, the cutting resistance will be significantly reduced. At this time, the rotational torque driven by the spindle motor may exceed the balance state required for normal cutting, causing the drill bit to idle and slip under low load, resulting in uncontrolled self-rotation of the drill bit. This self-rotation state will not only accelerate the wear of the drill bit, but also cause quality problems such as enlarged processing hole diameter and position offset. Summary of the Invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an automatic drilling device for a CNC lathe to solve the problem of uncontrolled rotation of the drill bit. This rotation state not only accelerates the wear of the drill bit, but also causes quality problems such as enlargement of the processed hole diameter and position deviation.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention relates to an automatic drilling device for a CNC lathe, comprising a radial drilling machine, wherein the radial drilling machine is provided with a column, a rocker arm is provided on the column, a spindle box is provided on the rocker arm, a driving assembly is provided inside the spindle box, the driving assembly is connected to the spindle sleeve, the spindle is movably connected inside the spindle sleeve, a drill bit mounting assembly is installed on the spindle, the drill bit mounting assembly comprises a connecting sleeve, a mounting hole is provided at the bottom of the connecting sleeve, a drill bit can be passed through the mounting hole to be installed in the connecting sleeve, four mounting cavities arranged at equal distances are provided inside the connecting sleeve, a first connecting frame is provided inside each of the mounting cavities, a limiting wheel is provided inside each of the first connecting frames, and the rolling surface of the limiting wheel can press against the surface of the drill bit to squeeze and clamp it;

[0009] A linkage assembly is provided inside the connecting sleeve and is used to drive the first connecting frame to slide toward the drill bit to clamp and limit it;

[0010] An angle adjustment component is arranged inside the connecting sleeve and is used to adjust the angle of the limiting wheel to apply reverse force to the drill bit.

[0011] Preferably, the first connecting frame is U-shaped, and the concave cavity of the first connecting frame faces the middle of the connecting sleeve, and a second connecting frame is provided on the side of the first connecting frame away from the middle of the connecting sleeve, and the second connecting frame is also U-shaped, and the concave cavity of the second connecting frame faces the middle of the connecting sleeve, and a first limiting shaft is installed on the side of the first connecting frame facing the second connecting frame, and a first limiting hole adapted to the first limiting shaft is opened in the middle of the second connecting frame, and the outer wall of the first limiting shaft is rotatably connected to the inner wall of the first limiting hole for limiting the first limiting shaft.

[0012] Preferably, a third connecting frame is provided on the upper side of the second connecting frame, and the third connecting frame is also U-shaped, and the concave cavity of the third connecting frame faces downward, and sliding shafts are fixed on both sides of the second connecting frame, and first slide rails adapted for the sliding shaft are provided on both sides of the third connecting frame, and the sliding shaft is slidably connected to the inside of the first slide rail, and the first slide rail is composed of an inclined slide and a vertical slide, the bottom end of the inclined slide is close to the center of the connecting sleeve, and the top end of the inclined slide is away from the center of the connecting sleeve, and the top end of the inclined slide is connected to the bottom end of the vertical slide, and the initial position of the sliding shaft is located at the bottom end of the inclined slide.

[0013] Preferably, the linkage assembly includes a top shaft fixed to the top of the third connecting frame, and the top of the top shaft has an arc-shaped surface, the inner wall of the connecting sleeve is rotatably connected to a ring disk, and a linkage block is fixed to the bottom of the annular disk, and the linkage block has a top end and a bottom end, and the path from the top end to the bottom end is arc-shaped, and the initial position of the top shaft is located at the top end of the linkage block.

[0014] Preferably, the angle adjustment assembly includes a fan-shaped gear ring installed on the outer wall of the first limiting shaft, a first tooth plate is provided on the side of the second connecting frame away from the first connecting frame, and the first tooth plate is meshed with the fan-shaped gear ring, a first side plate is fixed on the side of the second connecting frame away from the first connecting frame, two second side plates are fixed on one side of the first tooth plate, a third limiting shaft is fixed between the two second side plates, a third limiting hole adapted for the third limiting shaft is opened on the first side plate, and the third limiting shaft is slidably connected to the inside of the third limiting hole, and the third limiting shaft cooperates with the third limiting hole to limit the first tooth plate.

[0015] Preferably, a second return spring is fixed between the second side plate and the first side plate, and the third limit shaft is located inside the second return spring, and the two branch ends of the second connecting frame are fixed with connecting pieces, and the connecting piece is in an inverted U shape, and the inner wall of the connecting piece is provided with a second slide rail, and the outer wall of the first connecting frame is fixed with a cylinder, and the end of the cylinder away from the first connecting frame is located inside the connecting piece, and the outer wall of the cylinder is fixed with a support shaft, and each second slide rail corresponds to a support shaft, and one end of the support shaft is slidably connected to the inside of the corresponding second slide rail.

[0016] Preferably, a rolling assembly is provided on the first connecting frame, and the rolling assembly includes an inner shaft slidably connected to the inside of the cylinder, and the inner shaft can slide laterally along the axial direction of the inner shaft, a center hole adapted for the inner shaft is provided in the middle of the limiting wheel, and the inner shaft is slidably connected to the corresponding center hole, a spiral groove is provided on the inner wall of the center hole, a protrusion is fixed on the outer wall of one end of the inner shaft located inside the center hole, and the protrusion is slidably connected to the corresponding spiral groove, an arc block is fixed on the inner wall of the connecting member, and the top end of the arc block is away from the corresponding limiting wheel, and the bottom end of the arc block is close to the corresponding limiting wheel, and the initial position of the inner shaft is located at the top end of the arc block.

[0017] Preferably, two second limiting shafts are fixed on the side of the second connecting frame away from the first connecting frame, a second limiting hole adapted to the second limiting shaft is opened on the connecting sleeve, and the second limiting shaft is slidably connected to the inside of the second limiting hole for limiting the second connecting frame.

[0018] Preferably, a linkage rack is installed on the top of the annular disk, a drive shaft is provided on the upper side of the annular disk, a linkage gear ring is installed on the outer wall of the drive shaft, and the linkage gear ring is meshed and connected with the linkage rack, a positioning hole adapted to the drive shaft is opened on the connecting sleeve, and the outer wall of the drive shaft is rotatably connected to the inner wall of the positioning hole.

[0019] Preferably, a third slide rail is fixed to the inner wall of the installation cavity, a side block is fixed to the side of the connecting member facing the third slide rail, and the side block is slidably connected to the inside of the third slide rail.

[0020] The beneficial effects of the present invention are:

[0021] 1. The gear transmission chain composed of a drive shaft, a linkage gear ring, etc. realizes the synchronous control of a single shaft on a multi-stage connecting frame. The sliding shaft drives the connecting frame to slide along the combined motion of the inclined slide and the vertical slide. In combination with the limit wheel and anti-slip pad, it realizes fast and uniform clamping, improves clamping efficiency and reduces manual adjustment time.

[0022] 2. A surrounding clamping structure is formed by connecting four sets of equidistant limiting wheels connected to the sleeve. After the drill bit is inserted, it is synchronously fitted from all sides. The anti-slip pad on the wheel surface increases friction, improving the axis stability when the drill bit rotates and avoiding the uneven force of traditional single-point clamping.

[0023] 3. Through the meshing transmission of the sector-shaped gear ring and the first gear plate, the limit wheel can be accurately adjusted from a vertical state to a reverse tilt. The tangential friction force offsets the self-rotation tendency of the drill bit, prevents loosening and falling off, and enhances clamping reliability.

[0024] 4. The inner shaft convex block of the rolling assembly cooperates with the spiral groove of the limiting wheel to drive the limiting wheel to roll in a directional manner and apply a reverse rotation torque to offset the cutting rotation trend; the arc-shaped end face of the inner shaft and the arc block slide together to achieve dynamic compensation in the tilted state, reduce processing errors and workpiece damage, and improve drilling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a structural schematic diagram of the connecting sleeve of the present invention.

[0027] Figure 3 It is a structural schematic diagram of a first three-dimensional cross-section of the connecting sleeve of the present invention.

[0028] Figure 4 It is a structural schematic diagram of the second three-dimensional cross-section of the connecting sleeve of the present invention.

[0029] Figure 5 It is a structural schematic diagram of the drill bit mounting assembly of the present invention.

[0030] Figure 6 It is a structural schematic diagram of the angle adjustment assembly of the present invention.

[0031] Figure 7 Schematic diagram of the structure of the connecting piece of the present invention.

[0032] Figure 8 It is a structural schematic diagram of the cylinder of the present invention.

[0033] Figure 9 It is a schematic structural diagram of the rolling assembly of the present invention.

[0034] Figure 10 It is a structural schematic diagram of the third three-dimensional cross-section of the connecting sleeve of the present invention.

[0035] Figure 11 It is a structural schematic diagram of the installation cavity of the present invention.

[0036] In the picture:

[0037] 10. Radial drilling machine;

[0038] 101. Base; 102. Column; 103. Rocker arm; 104. Spindle box; 105. Spindle sleeve; 106. Spindle; 107. Workbench;

[0039] 20. Drill bit mounting assembly; 21. Connecting sleeve; 22. First connecting frame; 23. Limiting wheel; 24. Second connecting frame; 25. First limiting shaft; 26. First limiting hole; 27. Third connecting frame; 28. Sliding shaft; 29. ​​First slide rail; 210. Connecting plate; 211. First return spring; 212. Second limiting shaft; 213. Second limiting hole;

[0040] 30. Linkage assembly; 31. Top shaft; 32. Ring disk; 33. Linkage block; 34. Linkage rack; 35. Drive shaft; 36. Linkage gear ring; 37. Positioning hole;

[0041] 40. Angle adjustment assembly; 41. Sector gear ring; 42. First gear plate; 43. First side plate; 44. Second side plate; 45. Third limiting shaft; 46. Third limiting hole; 47. Connector; 48. Second slide rail; 49. Cylinder; 410. Side block; 411. Third slide rail; 412. Second return spring;

[0042] 50. Rolling assembly; 51. Inner shaft; 52. Center hole; 53. Spiral groove; 54. Protrusion; 55. Arc block. DETAILED DESCRIPTION

[0043] The following will refer to the attached Figures 1 to 11 The embodiments of the present invention are described in detail. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0044] like Figures 1 to 11As shown, an automatic drilling device for a CNC lathe of the present invention includes a radial drilling machine 10, which includes a base 101. A workbench 107 and a column 102 are installed on the top of the base 101. The workpiece can be placed on the workbench 107 for drilling processing. A rocker arm 103 is installed on the column 102, and a spindle box 104 is installed on the rocker arm 103. A driving assembly is installed inside the spindle box 104, and the driving assembly is connected to a spindle sleeve 105. The driving assembly can drive the spindle sleeve 105 to slide up and down to adjust the height for use. The spindle sleeve 105 is movably connected to a spindle 106 inside, and the driving assembly is also connected to the spindle 106, which can drive the spindle 106 to rotate. A drill bit mounting assembly 20 is installed on the spindle 106 for mounting the drill bit.

[0045] The drill bit mounting assembly 20 includes a connecting sleeve 21. A mounting hole is provided at the bottom of the connecting sleeve 21. The drill bit can be passed through the mounting hole to the interior of the connecting sleeve 21 for installation. Four equidistantly arranged mounting cavities are provided inside the connecting sleeve 21, and a rib wall is formed between every two mounting cavities. A first connecting frame 22 is provided inside each mounting cavity, and the first connecting frame 22 is U-shaped, and the concave cavity of the first connecting frame 22 faces the middle of the connecting sleeve 21. A limiting wheel 23 is provided inside each first connecting frame 22, and the rolling surface of the limiting wheel 23 can press against the surface of the drill bit to squeeze and clamp it, thereby improving the stability of the drill bit.

[0046] A second connecting frame 24 is provided on the side of the first connecting frame 22 away from the middle of the connecting sleeve 21. The second connecting frame 24 is also U-shaped, and the concave cavity of the second connecting frame 24 faces the middle of the connecting sleeve 21. A first limiting shaft 25 is installed on the side of the first connecting frame 22 facing the second connecting frame 24. A first limiting hole 26 adapted to the first limiting shaft 25 is opened in the middle of the second connecting frame 24, and the outer wall of the first limiting shaft 25 is rotatably connected to the inner wall of the first limiting hole 26, and the minimum diameter value of the first limiting hole 26 is greater than the maximum diameter value of the first limiting shaft 25, which is used to limit the first limiting shaft 25, thereby maintaining the stability of the first connecting frame 22.

[0047] A third connecting frame 27 is provided on the upper side of the second connecting frame 24, and the third connecting frame 27 is also U-shaped, and the concave cavity of the third connecting frame 27 faces downward. Sliding shafts 28 are fixed on both sides of the second connecting frame 24, and first sliding rails 29 adapted to the sliding shafts 28 are provided on both sides of the third connecting frame 27, and the sliding shafts 28 are slidably connected to the inside of the first sliding rails 29.

[0048] It should be noted that the first slide rail 29 consists of an inclined slide and a vertical slide. The bottom end of the inclined slide is close to the center of the connecting sleeve 21, the top end of the inclined slide is away from the center of the connecting sleeve 21, and the top end of the inclined slide is connected to the bottom end of the vertical slide, and the initial position of the sliding shaft 28 is located at the bottom end of the inclined slide.

[0049] A connecting plate 210 is fixed to the bottom of the third connecting frame 27, and a first reset spring 211 is fixed between the bottom of the connecting plate 210 and the inner bottom wall of the installation cavity, which is used to support the third connecting frame 27, thereby facilitating the reset of the third connecting frame 27 after it is released from the restriction.

[0050] Two second limiting shafts 212 are fixed on the side of the second connecting frame 24 away from the first connecting frame 22. A second limiting hole 213 that is compatible with the second limiting shaft 212 is opened on the connecting sleeve 21, and the second limiting shaft 212 is slidably connected to the inside of the second limiting hole 213, which is used to limit the second connecting frame 24, thereby maintaining the stability of the second connecting frame 24.

[0051] A linkage assembly 30 is installed inside the connecting sleeve 21, which can drive the first connecting frame 22 to slide towards and away from the drill bit, thereby facilitating the disassembly and assembly of the drill bit.

[0052] The linkage assembly 30 includes a top shaft 31 fixed to the top of the third connecting frame 27, and the top of the top shaft 31 has an arc-shaped surface. The inner wall of the connecting sleeve 21 is rotatably connected to a ring disk 32. A linkage block 33 is fixed to the bottom of the annular disk 32. The linkage block 33 has a top end and a bottom end, and the path from the top end to the bottom end is arc-shaped. The initial position of the top shaft 31 is located at the top end of the linkage block 33. When the annular disk 32 rotates, the linkage block 33 will squeeze the top shaft 31, and the top shaft 31 slides from the top end of the linkage block 33 to its bottom end, thereby driving the third connecting frame 27 to move downward.

[0053] A linkage rack 34 is installed on the top of the annular disk 32, and a drive shaft 35 is provided on the upper side of the annular disk 32. A linkage gear ring 36 is installed on the outer wall of the drive shaft 35, and the linkage gear ring 36 is meshed and connected with the linkage rack 34. The drive shaft 35 can drive the annular disk 32 to rotate through the linkage gear ring 36 and the linkage rack 34, thereby adjusting the height of the third connecting frame 27.

[0054] A positioning hole 37 adapted to the drive shaft 35 is formed on the connecting sleeve 21 , and the outer wall of the drive shaft 35 is rotatably connected to the inner wall of the positioning hole 37 to limit the drive shaft 35 and thus maintain the stability of the drive shaft 35 .

[0055] When the device is used, the staff first installs the workpiece to be drilled on the workbench 107. Since the top of the connecting sleeve 21 also has a plug-in end, the staff plugs the plug-in end at the top of the connecting sleeve 21 into the inside of the main shaft 106 for installation, and adjusts the position of the main shaft sleeve 105 and the main shaft 106 through the rocker arm 103, so that the connecting sleeve 21 is moved directly above the workpiece, and then the top of the drill bit is plugged into the inside of the connecting sleeve 21 through the mounting hole. When the drill bit hits the annular disk 32, the drill bit will not be able to move up further. Then the staff holds the drive shaft 35 and extends one end of the positioning hole 37, and then drives the drive shaft 35 to rotate. The drive shaft 35 drives the annular disk 32 to rotate through the linkage gear ring 36 and the linkage rack 34. The annular disk 32 in the rotating state contacts the top shaft 31 through the linkage block 33, and the top shaft 31 The top slides from the top of the linkage block 33 to its bottom end, and the top shaft 31 drives the connected third connecting frame 27 to move downward. At this time, the connecting plate 210 of the third connecting frame 27 moves downward synchronously to compress the first return spring 211, and the sliding shaft 28 slides from the bottom end of the first slide rail 29 to its top end, and the sliding shaft 28 drives the first connecting frame 22 to slide toward the drill bit through the second connecting frame 24 and the first limiting shaft 25. Since the surface of the limiting wheel 23 has an anti-slip pad, when the first connecting frame 22 drives the limiting wheel 23 to rest against the drill bit surface, the drill bit will be limited, and the anti-slip pad can increase the friction strength on the drill bit, thereby preventing the drill bit from falling off. After the drill bit is installed, the driving assembly can drive the main shaft 106 to rotate, and the main shaft 106 drives the combined drill bit to rotate through the connecting sleeve 21, thereby drilling the workpiece.

[0056] An angle adjustment assembly 40 is provided inside the connecting sleeve 21 for adjusting the angle of the limiting wheel 23 to improve the stability of the drill bit.

[0057] The angle adjustment assembly 40 includes a sector-shaped gear ring 41 installed on the outer wall of the first limiting shaft 25, and a first tooth plate 42 is provided on the side of the second connecting frame 24 away from the first connecting frame 22, and the first tooth plate 42 is meshed and connected with the sector-shaped gear ring 41, and is used to drive the first limiting shaft 25 to rotate, so that the angle of the limiting wheel 23 can be adjusted to position the drill bit.

[0058] A first side plate 43 is fixed to the side of the second connecting frame 24 away from the first connecting frame 22, two second side plates 44 are fixed to one side of the first tooth plate 42, a third limiting shaft 45 is fixed between the two second side plates 44, a third limiting hole 46 adapted to the third limiting shaft 45 is opened on the first side plate 43, and the third limiting shaft 45 is slidably connected to the inside of the third limiting hole 46, and the third limiting shaft 45 cooperates with the third limiting hole 46 to limit the first tooth plate 42.

[0059] A second return spring 412 is fixed between the second side plate 44 and the first side plate 43 , and the third limiting shaft 45 is located inside the second return spring 412 for supporting the first tooth plate 42 , thereby facilitating the return of the first tooth plate 42 .

[0060] Both branch ends of the second connecting frame 24 are fixed with connecting parts 47, and the connecting part 47 is in an inverted U shape. The inner wall of the connecting part 47 is provided with a second slide rail 48. The outer wall of the first connecting frame 22 is fixed with a cylinder 49, and the end of the cylinder 49 away from the first connecting frame 22 is located inside the connecting part 47. The outer wall of the cylinder 49 is fixed with a support shaft. The number of support shafts corresponds to the number of second slide rails 48, and each second slide rail 48 corresponds to a support shaft, and one end of the support shaft is slidably connected to the inside of the corresponding second slide rail 48 for limiting the connecting part 47.

[0061] A third slide rail 411 is fixed to the inner wall of the installation cavity, and a side block 410 is fixed to the side of the connecting member 47 facing the third slide rail 411, and the side block 410 is slidably connected to the inside of the third slide rail 411. The side block 410 cooperates with the third slide rail 411 to limit the connecting member 47, thereby maintaining the stability of the connecting member 47 when sliding.

[0062] Since there is a gap between the bottom of the third connecting frame 27 and the top of the first toothed plate 42 in the initial position, when the third connecting frame 27 moves downward, the first toothed plate 42 does not contact the third connecting frame 27. When the sliding shaft 28 slides from the bottom end of the first slide rail 29 to its top end, the bottom of the third connecting frame 27 is against the top of the first toothed plate 42. As the third connecting frame 27 continues to move downward, the sliding shaft 28 first slides inside the vertical slide, and the first toothed plate 42 moves downward, and the second side plate 44 moves downward to compress the second return spring 412. The first toothed plate 42 drives the first limiting shaft 25 to rotate through the fan-shaped gear ring 41, and the first limiting shaft 25 drives the first connecting frame 22 to rotate, and the limiting wheel 23 of the first connecting frame 22 is turned from a vertical state to an inclined state. At this time, the inclined limiting wheel 23 rotates in the opposite direction to the main shaft 106, thereby applying a cutting force to the drill bit surface, thereby increasing the friction strength of the limiting wheel 23 on the drill bit.

[0063] A rolling assembly 50 is provided on the first connecting frame 22 for rotating the limiting wheel 23 in the inclined state, thereby applying a reverse rotation force to the drill bit to prevent the drill bit from rotating when drilling.

[0064] The rolling assembly 50 includes an inner shaft 51 which is slidably connected to the inside of the cylinder 49, and the inner shaft 51 can slide laterally along the axial direction of the inner shaft 51. A center hole 52 which is compatible with the inner shaft 51 is provided in the middle of the limiting wheel 23, and the inner shaft 51 is slidably connected to the corresponding center hole 52. A spiral groove 53 is provided on the inner wall of the center hole 52. A protrusion 54 is fixed to the outer wall of one end of the inner shaft 51 located inside the center hole 52, and the protrusion 54 is slidably connected to the corresponding spiral groove 53. The protrusion 54 cooperates with the spiral groove 53 to drive the limiting wheel 23 to rotate, thereby applying a reverse rotation force to the drill bit. An arc block 55 is fixed to the inner wall of the connecting member 47, and the top end of the arc block 55 is away from the corresponding limiting wheel 23, and the bottom end of the arc block 55 is close to the corresponding limiting wheel 23, and the initial position of the inner shaft 51 is at the top end of the arc block 55.

[0065] Since the inner shaft 51 has an arc-shaped surface at one end close to the corresponding arc block 55, when the limiting wheel 23 rotates, the arc-shaped surface of the inner shaft 51 will slide against the surface of the arc block 55. At this time, the inner shaft 51 slides from the top of the arc block 55 to the bottom thereof, and the inner shaft 51 is restricted by the arc block 55. The inner shaft 51 can slide inside the cylinder 49. At this time, the two adjacent inner shafts 51 are close to each other, and the protrusion 54 slides inside the corresponding spiral groove 53. At this time, the limiting wheel 23 can rotate, and the direction of rotation of the limiting wheel 23 is opposite to the direction of rotation of the drill bit when drilling, thereby improving the stability of the drill bit and avoiding the drill bit from rotating when drilling.

Claims

1. An automatic drilling device for a numerically controlled lathe, comprising a radial drilling machine (10), wherein a column (102) is mounted on the radial drilling machine (10), a rocker arm (103) is mounted on the column (102), a spindle box (104) is mounted on the rocker arm (103), a drive assembly is mounted inside the spindle box (104), the drive assembly is connected to a spindle sleeve (105), and a spindle (106) is movably connected inside the spindle sleeve (105), characterized in that: A drill bit mounting assembly (20) is mounted on the spindle (106), and the drill bit mounting assembly (20) includes a connecting sleeve (21), a mounting hole is provided at the bottom of the connecting sleeve (21), and the drill bit can be installed by passing through the mounting hole into the interior of the connecting sleeve (21), and the interior of the connecting sleeve (21) is provided with four mounting cavities arranged at equal distances, and a first connecting frame (22) is provided inside each of the mounting cavities, and a limiting wheel (23) is provided inside each of the first connecting frames (22), and the rolling surface of the limiting wheel (23) can press against the surface of the drill bit to squeeze and clamp it; The first connecting frame (22) is U-shaped, and the concave cavity of the first connecting frame (22) faces the middle of the connecting sleeve (21). A second connecting frame (24) is provided on the side of the first connecting frame (22) away from the middle of the connecting sleeve (21). The second connecting frame (24) is also U-shaped, and the concave cavity of the second connecting frame (24) faces the middle of the connecting sleeve (21). A first limiting shaft (25) is installed on the side of the first connecting frame (22) facing the second connecting frame (24). A first limiting hole (26) adapted to the first limiting shaft (25) is opened in the middle of the second connecting frame (24). The outer wall of the first limiting shaft (25) is rotatably connected to the inner wall of the first limiting hole (26) for limiting the first limiting shaft (25). A third connecting frame (27) is provided on the upper side of the second connecting frame (24), and the third connecting frame (27) is also U-shaped, and the concave cavity of the third connecting frame (27) faces downward, and sliding shafts (28) are fixed on both sides of the second connecting frame (24), and first slide rails (29) adapted to the sliding shafts (28) are provided on both sides of the third connecting frame (27), and the sliding shafts (28) are slidably connected to the inside of the first slide rails (29), and the first slide rails (29) are composed of an inclined slide and a vertical slide, the bottom end of the inclined slide is close to the center of the connecting sleeve (21), the top end of the inclined slide is away from the center of the connecting sleeve (21), and the top end of the inclined slide is connected to the bottom end of the vertical slide, and the initial position of the sliding shaft (28) is located at the bottom end of the inclined slide; A linkage assembly (30), the linkage assembly (30) is arranged inside the connecting sleeve (21) and is used to drive the first connecting frame (22) to slide toward the drill bit to clamp and limit it; The linkage assembly (30) includes a top shaft (31) fixed to the top of the third connecting frame (27), and the top of the top shaft (31) has an arc-shaped surface, the inner wall of the connecting sleeve (21) is rotatably connected to an annular disk (32), a linkage block (33) is fixed to the bottom of the annular disk (32), and the linkage block (33) has a top end and a bottom end, and the path from the top end to the bottom end is arc-shaped, and the initial position of the top shaft (31) is located at the top end of the linkage block (33); An angle adjustment component (40), which is arranged inside the connecting sleeve (21) and is used to adjust the angle of the limiting wheel (23) to apply a reverse force to the drill bit; The angle adjustment assembly (40) includes a sector-shaped toothed ring (41) mounted on the outer wall of the first limiting shaft (25); a first toothed plate (42) is provided on the side of the second connecting frame (24) away from the first connecting frame (22), and the first toothed plate (42) is meshedly connected to the sector-shaped toothed ring (41); a first side plate (43) is fixed on the side of the second connecting frame (24) away from the first connecting frame (22); two second side plates (44) are fixed on one side of the first toothed plate (42); a third limiting shaft (45) is fixed between the two second side plates (44); a third limiting hole (46) adapted to the third limiting shaft (45) is provided on the first side plate (43), and the third limiting shaft (45) is slidably connected to the inside of the third limiting hole (46); the third limiting shaft (45) cooperates with the third limiting hole (46) to limit the first toothed plate (42); A second return spring (412) is fixed between the second side plate (44) and the first side plate (43), and the third limit shaft (45) is located inside the second return spring (412). Both ends of the second connecting frame (24) are fixed with a connecting piece (47), and the connecting piece (47) is in an inverted U shape. The inner wall of the connecting piece (47) is provided with a second slide rail (48). A cylinder (49) is fixed to the outer wall of the first connecting frame (22), and the end of the cylinder (49) away from the first connecting frame (22) is located inside the connecting piece (47). A support shaft is fixed to the outer wall of the cylinder (49), and each second slide rail (48) corresponds to a support shaft, and one end of the support shaft is slidably connected and arranged inside the corresponding second slide rail (48); The first connecting frame (22) is provided with a rolling assembly (50), the rolling assembly (50) includes an inner shaft (51) slidably connected to the inside of the cylinder (49), and the inner shaft (51) can slide laterally along the axial direction of the inner shaft (51), the middle of the limiting wheel (23) is provided with a center hole (52) adapted to the inner shaft (51), and the inner shaft (51) is slidably connected to the inside of the corresponding center hole (52), and the inner wall of the center hole (52) is provided with a spiral groove (53) ), a protrusion (54) is fixed to the outer wall of one end of the inner shaft (51) located inside the center hole (52), and the protrusion (54) is slidably connected to the inside of the corresponding spiral groove (53), an arc block (55) is fixed to the inner wall of the connecting member (47), and the top end of the arc block (55) is away from the corresponding limiting wheel (23), and the bottom end of the arc block (55) is close to the corresponding limiting wheel (23), and the initial position of the inner shaft (51) is located at the top end of the arc block (55).

2. The automatic drilling device for a CNC lathe according to claim 1, characterized in that: Two second limiting shafts (212) are fixed on one side of the second connecting frame (24) away from the first connecting frame (22); a second limiting hole (213) adapted to the second limiting shaft (212) is provided on the connecting sleeve (21); and the second limiting shaft (212) is slidably connected to the inside of the second limiting hole (213) for limiting the second connecting frame (24).

3. The automatic drilling device for a CNC lathe according to claim 1, characterized in that: A linkage rack (34) is installed on the top of the annular disk (32), a driving shaft (35) is provided on the upper side of the annular disk (32), a linkage gear ring (36) is installed on the outer wall of the driving shaft (35), and the linkage gear ring (36) is meshedly connected with the linkage rack (34), a positioning hole (37) adapted to the driving shaft (35) is opened on the connecting sleeve (21), and the outer wall of the driving shaft (35) is rotatably connected to the inner wall of the positioning hole (37).

4. The automatic drilling device for a CNC lathe according to claim 1, characterized in that: A third slide rail (411) is fixed to the inner wall of the installation cavity, a side block (410) is fixed to the side of the connecting member (47) facing the third slide rail (411), and the side block (410) is slidably connected to the inside of the third slide rail (411).

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