Tennis racket double-head automatic drilling machine based on self-adaptive positioning and clamping

Abstract

The invention relates to the field of tennis racket processing, in particular to a tennis racket double-head automatic drilling machine based on self-adaptive positioning clamping, which comprises a base frame, a sliding mounting table in sliding connection is arranged above one end of the base frame, a sliding frame in sliding connection is further arranged above the base frame, and a centering fixing mechanism is arranged in the sliding mounting table. The centering fixing mechanism comprises a second lead screw motor, the second lead screw motor and the sliding mounting table are fixed through bolts, a rotary drilling mechanism is arranged in the sliding frame and comprises a rotary table, the rotary table is rotationally connected with the sliding frame, and a first mounting frame is fixedly arranged on one side of the upper portion of the sliding frame through bolts. In the drilling process, the two clamping rollers on the outer side of the tennis racket abut against the outer layer of the tennis racket, the impact force of the drilling machine on the tennis racket during drilling is relieved, the possibility that the tennis racket is damaged during drilling is reduced, and the yield of the tennis racket during drilling is increased.

Description

Technical Field

[0001] The present invention relates to the field of tennis racket processing, and particularly to a double-head automatic drilling machine for tennis rackets based on adaptive positioning and clamping. Background Art

[0002] In the early stage of tennis racket manufacturing, drilling mainly relied on manual operation. Workers used simple drilling tools to drill holes one by one on the tennis racket frame. The accuracy and quality of drilling largely depended on the experience and skills of the workers. With the popularization of tennis and the increasing demand in the tennis racket market, the traditional manual drilling method can no longer meet the needs of large-scale production, which has promoted the research and development and application of drilling machines. It has gradually developed from the initial single-head drilling machine to a double-head drilling machine, greatly reducing the time interval of drilling and improving production efficiency.

[0003] The Chinese patent discloses a double-head automatic drilling machine for tennis rackets and its drilling method (application number: 2020110658357), which drills the tennis racket alternately through two drilling machines above and below, reducing the waiting time of the drilling gap. Compared with the traditional single-head drilling machine, the drilling efficiency is significantly improved.

[0004] However, although the above patent presses and conveys the tennis racket through the driving roller and the driven roller, the head of the tennis racket is not a pure circular structure, and there is no elastic component between the driving roller and the driven roller. When the driving roller and the driven roller are both fixedly installed, it is difficult to convey the elliptical head of the tennis racket using the driving roller and the driven roller. At the same time, there is no buffer or abutting component outside the drilling position of the tennis racket, which easily leads to a large force on the drilling position of the tennis racket during the drilling process, causing the deformation of the tennis racket.

[0005] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a double-head automatic drilling machine for tennis rackets based on adaptive positioning and clamping to solve the above-mentioned technical defects.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A double-head automatic drilling machine for tennis rackets based on adaptive positioning and clamping, which includes a base frame. Above one end of the base frame, there is a sliding mounting table connected in a sliding manner. Above the base frame, there is also a sliding frame connected in a sliding manner. Inside the sliding mounting table, there is a center fixing mechanism.

[0008] The center fixing mechanism includes a second screw motor, which is fixed to the sliding mounting table by bolts. Inside the sliding frame, there is a rotating drilling mechanism, and the rotating drilling mechanism includes a rotating table.

[0009] The rotating table is rotatably connected to the sliding frame. One side above the sliding frame is fixedly provided with a first mounting frame by bolts. The outside of the rotating table is provided with a fixedly connected second mounting frame. Limiting and supporting structures are arranged inside both the first mounting frame and the second mounting frame. The limiting and supporting structure includes a second electric telescopic cylinder, and one end of the second electric telescopic cylinder is fixedly bolted to the first mounting frame and the second mounting frame.

[0010] Preferably, a first electric telescopic cylinder is fixedly installed in the slot of the base frame by bolts. One side of the base frame is also fixedly installed with a first lead screw motor by bolts. The end of the drive shaft of the first lead screw motor is fixedly provided with a lead screw. The bottom of the sliding mounting table is fixedly provided with a first lead screw slider by bolts, and the first lead screw slider is threadedly connected to the lead screw.

[0011] Preferably, an installation groove is formed above the sliding mounting table. One side of the sliding mounting table is also fixedly provided with a first internal thread cylinder by welding. One side of the sliding mounting table is also fixedly provided with a second internal thread cylinder by welding. The bottom of the sliding frame is provided with an extended plate fixedly connected thereto, and the extended plate is fixedly connected to the end of the drive shaft of the first electric telescopic cylinder. A circular groove is formed at the center inside the sliding frame.

[0012] Preferably, a chute is formed on one side of the circular groove. A stepping motor is also fixedly provided at the bottom of the sliding frame by bolts. The drive shaft of the stepping motor passes through the sliding frame and is fixedly provided with a spur gear at the end.

[0013] Preferably, the end of the drive shaft of the second lead screw motor is fixedly provided with a first bidirectional lead screw. Two second lead screw sliders are symmetrically distributed and threadedly connected to the outside of the first bidirectional lead screw. Clamping frames are fixedly provided above the second lead screw sliders. Rubber buffer plates are fixedly provided at the adjacent ends of the clamping frames by adhesive. A lifting table and a push block which are slidably connected are arranged inside the installation groove.

[0014] Preferably, the push block is slidably connected to the lifting table. One end of the push block is provided with a first hand-tightening screw rotatably connected thereto, and the first hand-tightening screw is threadedly connected to the second internal thread cylinder. A second hand-tightening screw which is threadedly connected is arranged inside the second internal thread cylinder. One end of the second hand-tightening screw is provided with a push plate rotatably connected thereto.

[0015] Preferably, an external gear ring is also fixedly connected to the lower part outside the rotating table. The external gear ring is meshed with the spur gear. A third lead screw motor is fixedly connected inside the rotating table. The end of the drive shaft of the third lead screw motor is fixedly provided with a second bidirectional lead screw. Screw sliders are symmetrically distributed and threadedly connected to the outside of the second bidirectional lead screw. Drilling machines are fixedly installed above the screw sliders by bolts, and drill bits are installed at one end of each drilling machine.

[0016] Preferably, the driving shaft of the second electric telescopic cylinder passes through the first mounting frame or the second mounting frame and is provided with a fixedly connected hollow cylinder, a micro electric cylinder is fixedly provided above the hollow cylinder, and a slidably connected telescopic rod is also sleeved inside the hollow cylinder;

[0017] One end of the telescopic rod is provided with an integrally formed mounting circular plate, a first telescopic spring fixedly connected is provided between the mounting circular plate and the hollow cylinder, one side of the mounting circular plate is provided with a rotatably connected V-shaped frame, both sides of the V-shaped frame are provided with a second telescopic spring fixedly connected, the other end of the second telescopic spring is fixedly connected to the mounting circular plate, and both ends of the V-shaped frame are also provided with rotatably connected clamping rollers.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention places the racket head of a tennis racket above a sliding frame, places the racket handle on a lifting platform between rubber buffer plates, then turns a first hand screw to adjust the height of the lifting platform until the drilling height of the racket head of the tennis racket coincides with the height of the drill bit, adjusts the racket head position of the tennis racket to the center above the sliding frame, turns a second hand screw until the push plate contacts one end of the racket handle, then starts a second screw motor, the second screw motor drives the first bidirectional screw to rotate, the first bidirectional screw drives two second screw sliders and the clamping frame thereon to move closer to the middle, fixes the racket handle of the tennis racket, and fixes tennis rackets of different sizes.

[0020] 2. When drilling a hole in a tennis racket, the present invention starts the two second electric telescopic cylinders until the two clamping rollers at one end of the second electric telescopic cylinders contact the outside of the tennis racket. The first telescopic spring is used to prevent the clamping force from being too large to damage the tennis racket. Then, the micro electric cylinder is started to fix the telescopic rod, so that when drilling a hole, the two clamping rollers on the outside of the tennis racket are against the outer layer of the tennis racket, which alleviates the impact force of the drilling machine on the tennis racket when drilling a hole, reduces the possibility of damaging the tennis racket when drilling, and improves the yield rate of the tennis racket when drilling a hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings;

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the connection structure between the base frame and the sliding mounting platform in the present invention;

[0024] Figure 3 It is a schematic diagram of the connection structure between the base frame and the sliding frame in the present invention;

[0025] Figure 4It is a schematic diagram of the connection structure between the first lead screw motor and the sliding mounting table in the present invention;

[0026] Figure 5 It is a schematic diagram of the overall structure of the centering fixing mechanism in the present invention;

[0027] Figure 6 It is a schematic diagram of the connection structure between the stepping motor and the rotating table in the present invention;

[0028] Figure 7 It is a schematic diagram of the connection structure between the second bidirectional lead screw and the drilling machine in the present invention;

[0029] Figure 8 It is a schematic diagram of the overall structure of the limit support structure in the present invention.

[0030] Legend: 1. Base frame; 11. First electric telescopic cylinder; 12. First lead screw motor; 13. Lead screw; 14. Sliding mounting table; 15. Installation groove; 16. Extension frame; 17. First internal thread cylinder; 18. Sliding frame; 19. Circular groove; 20. Chute; 21. Extension plate; 22. Stepping motor; 23. Straight gear; 24. First lead screw slider; 25. First mounting frame; 3. Centering fixing mechanism; 31. Second lead screw motor; 32. First bidirectional lead screw; 33. Second lead screw slider; 34. Clamping frame; 35. Rubber buffer plate; 36. Lifting table; 37. Pusher block; 38. First hand-tightening screw; 39. Second hand-tightening screw; 40. Push plate; 5. Rotating drilling mechanism; 51. Rotating table; 52. External gear ring; 53. Second mounting frame; 54. Third lead screw motor; 55. Second bidirectional lead screw; 56. Lead screw slider; 57. Drilling machine; 58. Drill bit; 6. Limit support structure; 61. Second electric telescopic cylinder; 62. Hollow cylinder; 63. Micro electric cylinder; 64. Telescopic rod; 65. First telescopic spring; 66. Mounting circular plate; 67. V-shaped frame; 68. Clamping roller; 69. Second telescopic spring. Specific implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1: Please refer to Figure 1 - Figure 5 As shown, the present invention is a double-headed automatic drilling machine for tennis rackets based on adaptive positioning and clamping, including a base frame 1. The first electric telescopic cylinder 11 is fixedly installed in the slot of the base frame 1 through bolts, and limit slots are opened in the base frame 1 on both sides of the first electric telescopic cylinder 11;

[0033] On one side of the base frame 1, a first lead screw motor 12 is also fixedly installed by bolts. At the end of the drive shaft of the first lead screw motor 12, a fixedly connected lead screw 13 is provided. Above one end of the base frame 1, a sliding mounting table 14 is slidably connected. At the bottom of the sliding mounting table 14, a first lead screw slider 24 is fixedly provided by bolts. The lead screw 13 is located inside the first lead screw slider 24 and is threadedly connected to the first lead screw slider 24.

[0034] An installation groove 15 is formed above the sliding mounting table 14. On one side of the sliding mounting table 14, a first internal thread cylinder 17 is also fixedly provided by welding. On one side of the sliding mounting table 14, a second internal thread cylinder is also fixedly provided by welding. Above the base frame 1, a sliding frame 18 is also slidably connected. At the bottom of the sliding frame 18, an extended plate 21 is fixedly connected. The extended plate 21 is fixedly connected to the end of the drive shaft of the first electric telescopic cylinder 11;

[0035] At the center of the inside of the sliding frame 18, a circular groove 19 is formed. On one side of the circular groove 19, a chute 20 is formed. At the bottom of the sliding frame 18, a stepper motor 22 is also fixedly provided by bolts. After the drive shaft of the stepper motor 22 passes through the sliding frame 18, a fixedly connected spur gear 23 is provided. On one side above the sliding frame 18, a first mounting bracket 25 is fixedly provided by bolts.

[0036] A centering and fixing mechanism 3 is provided inside the sliding mounting table 14. The centering and fixing mechanism 3 includes a second lead screw motor 31. The second lead screw motor 31 is located at one end of the sliding mounting table 14 and is fixedly connected to the sliding mounting table 14 by bolts. After the drive shaft of the second lead screw motor 31 extends into the sliding mounting table 14, a first bidirectional lead screw 32 is fixedly provided. On the outer side of the first bidirectional lead screw 32, two second lead screw sliders 33 are symmetrically distributed. Both second lead screw sliders 33 are threadedly connected to the first bidirectional lead screw 32. Above both second lead screw sliders 33, clamping brackets 34 are fixedly provided. On the adjacent ends of the clamping brackets 34, rubber buffer plates 35 are fixedly provided by glue. The rubber buffer plates 35 are used for clamping the handle of the tennis racket.

[0037] An elevating platform 36 and a pushing block 37 which are slidably connected are provided inside the installation groove 15. The pushing block 37 is slidably connected to the elevating platform 36. When the pushing block 37 moves towards the side close to the sliding frame 18, the pushing block 37 gradually jacks up the elevating platform 36. At one end of the pushing block 37, a first hand-tightening screw 38 is rotatably connected. The first hand-tightening screw 38 is threadedly connected to the second internal thread cylinder. When the first hand-tightening screw 38 rotates, it drives the pushing block 37 to translate. Inside the first internal thread cylinder 17, a second hand-tightening screw 39 is threadedly connected. At one end of the second hand-tightening screw 39, a pushing plate 40 is rotatably connected. The pushing plate 40 is located above the extension frame 16 and is slidably connected to the extension frame 16.

[0038] When it is necessary to fix the handle of a tennis racket, first place the head of the tennis racket above the sliding frame 18 and the handle on the lifting platform 36 between the rubber buffer plates 35. Then, turn the first hand-tightening screw 38 to adjust the height of the lifting platform 36 until the drilling height of the head of the tennis racket coincides with the height of the drill bit 58. After adjusting the position of the head of the tennis racket to the center above the sliding frame 18, turn the second hand-tightening screw 39 until the push plate 40 contacts one end of the handle. Then, start the second lead screw motor 31. The second lead screw motor 31 drives the first bidirectional lead screw 32 to rotate. The first bidirectional lead screw 32 drives the two second lead screw sliders 33 and the clamping brackets 34 thereon to move closer to the middle to fix the handle of the tennis racket.

[0039] Please refer to Figure 6 - Figure 8 As shown, the present invention is a double-headed automatic drilling machine for tennis rackets based on adaptive positioning and clamping, including a sliding frame 18. A rotating drilling mechanism 5 is provided inside the sliding frame 18. The rotating drilling mechanism 5 includes a rotating table 51. The rotating table 51 is located inside the circular groove 19 and is rotatably connected to the sliding frame 18. A second mounting bracket 53 is fixedly connected to the outside of the rotating table 51. The second mounting bracket 53 is located inside the sliding groove 20. An external gear ring 52 is also fixedly connected to the lower side of the outside of the rotating table 51. The external gear ring 52 meshes with the spur gear 23.

[0040] A third lead screw motor 54 is fixedly connected inside the rotating table 51. The end of the drive shaft of the third lead screw motor 54 is fixedly connected with a second bidirectional lead screw 55. Symmetrically distributed lead screw sliders 56 are provided on the outside of the second bidirectional lead screw 55. The lead screw sliders 56 are all threadedly connected to the second bidirectional lead screw 55. A drilling machine 57 is fixedly installed above the lead screw sliders 56 through bolts. A replaceable drill bit 58 is installed at one end of the drilling machine 57.

[0041] Limiting and supporting structures 6 are provided inside both the first mounting bracket 25 and the second mounting bracket 53. The limiting and supporting structure 6 includes a second electric telescopic cylinder 61. One end of the second electric telescopic cylinder 61 is fixedly connected to the first mounting bracket 25 and the second mounting bracket 53 through bolts. The drive shaft of the second electric telescopic cylinder 61 passes through the first mounting bracket 25 or the second mounting bracket 53 and is fixedly connected with a hollow cylinder 62. A micro electric cylinder 63 is fixedly provided above the hollow cylinder 62 through bolts. The drive shaft of the micro electric cylinder 63 extends into the inside of the hollow cylinder 62.

[0042] A slidably connected telescopic rod 64 is also sleeved inside the hollow cylinder 62, and an integrally formed mounting circular plate 66 is provided at one end of the telescopic rod 64. A fixedly connected first telescopic spring 65 is provided between the mounting circular plate 66 and the hollow cylinder 62. The first telescopic spring 65 is sleeved on the outer side of the telescopic rod 64, and a rotatably connected V-shaped frame 67 is provided on one side of the mounting circular plate 66. Fixedly connected second telescopic springs 69 are provided on both sides of the V-shaped frame 67, and the other ends of the second telescopic springs 69 are fixedly connected to the mounting circular plate 66. Rotatably connected clamping rollers 68 are also provided at both ends of the V-shaped frame 67.

[0043] The working process and principle of the present invention are as follows:

[0044] When in use, first place the head of the tennis racket above the sliding frame 18, and place the handle on the lifting platform 36 between the rubber buffer plates 35, then turn the first hand screw 38 to adjust the height of the lifting platform 36 until the drilling height of the head of the tennis racket coincides with the height of the drill bit 58, adjust the position of the head of the tennis racket to the center above the sliding frame 18, turn the second hand screw 39 until the push plate 40 contacts one end of the handle, then start the second screw motor 31, the second screw motor 31 drives the first bidirectional screw 32 to rotate, the first bidirectional screw 32 drives the two second screw sliders 33 and the clamping frame 34 thereon to move closer to the middle, so as to fix the handle of the tennis racket, after the handle is fixed, start the first electric telescopic cylinder 11 to drive the sliding frame 18 to slide on the base frame 1, so that the two drill bits 58 are aligned with the inner side of the tennis racket to be drilled;

[0045] At this time, the positions of the first mounting frame 25 and the second mounting frame 53 are opposite to each other, and the two second electric telescopic cylinders 61 are started until the two clamping rollers 68 at one end of the second electric telescopic cylinders 61 are in contact with the outside of the tennis racket. The first telescopic spring 65 is used to prevent the tennis racket from being damaged by excessive clamping force. Then, the micro electric cylinder 63 is started to fix the telescopic rod 64, and then the third screw motor 54 is started to drive the second bidirectional screw 55 to rotate. The second bidirectional screw 55 drives the two screw sliders 56 to move outward until the drill bit 58 reaches the hole to be drilled. At this time, the drilling machine 57 is started to perform the drilling operation. When drilling, the two clamping rollers 68 on the outside of the tennis racket are against the outer layer of the tennis racket, thereby alleviating the impact force of the drilling machine 57 on the tennis racket when drilling, and reducing the possibility of damaging the tennis racket when drilling. After the first hole is drilled, the first electric telescopic cylinder 11 is started to move the position of the rotating table 51 to complete the drilling of both sides of the tennis racket.

[0046] When drilling holes in the upper and lower sides of the tennis racket, first start the stepper motor 22 to drive the spur gear 23 to rotate. The spur gear 23 drives the external gear ring 52 to rotate, and the external gear ring 52 drives the rotating table 51 to rotate 90 degrees until the second mounting bracket 53 contacts one side of the sliding groove 20. Subsequently, when drilling, only need to start the limit support structure 6 outside the second mounting bracket 53 to support the upper end of the racket head. By starting the first lead screw motor 12 to drive the first lead screw slider 24 to move, the first lead screw slider 24 drives the sliding mounting table 14 above it to move, so that the tennis racket can be horizontally translated above the rotating table 51, and the upper and lower ends of the tennis racket can be supported for drilling processing.

[0047] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific embodiments. Obviously, according to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. The double-headed automatic drilling machine for tennis rackets based on adaptive positioning and clamping, including a base frame (1), is characterized in that Above one end of the base frame (1), there is a sliding mounting table (14) connected by sliding, and above the base frame (1), there is also a sliding frame (18) connected by sliding. Inside the sliding mounting table (14), there is a centering and fixing mechanism (3). The centering and fixing mechanism (3) includes a second screw motor (31). The second screw motor (31) is fixed to the sliding mounting table (14) by bolts. Inside the sliding frame (18), there is a rotating drilling mechanism (5), and the rotating drilling mechanism (5) includes a rotating table (51). The rotating table (51) is rotatably connected to the sliding frame (18). Above one side of the sliding frame (18), there is a first mounting frame (25) fixed by bolts. Outside the rotating table (51), there is a second mounting frame (53) fixedly connected. Inside both the first mounting frame (25) and the second mounting frame (53), there is a limiting and supporting structure (6). The limiting and supporting structure (6) includes a second electric telescopic cylinder (61). One end of the second electric telescopic cylinder (61) is fixed to the first mounting frame (25) and the second mounting frame (53) by bolts.

2. The automatic double-headed drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 1, wherein Inside the base frame (1), there is a first electric telescopic cylinder (11) fixedly installed. On one side of the base frame (1), there is also a first screw motor (12) fixed by bolts. At the end of the driving shaft of the first screw motor (12), there is a screw rod (13) fixedly connected. At the bottom of the sliding mounting table (14), there is a first screw slider (24) fixed by bolts. The first screw slider (24) is threadedly connected to the screw rod (13).

3. The double-headed automatic drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 1, characterized in that, Above the sliding mounting table (14), there is an installation groove (15). On one side of the sliding mounting table (14), there is also a first internal thread cylinder (17) fixed by welding. On one side of the sliding mounting table (14), there is also a second internal thread cylinder fixed by welding. At the bottom of the sliding frame (18), there is an extension plate (21) fixedly connected. The extension plate (21) is fixedly connected to the end of the driving shaft of the first electric telescopic cylinder (11). At the center of the inside of the sliding frame (18), there is a circular groove (19).

4. The automatic double - headed drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 3, wherein, On one side of the circular groove (19), there is a sliding groove (20). At the bottom of the sliding frame (18), there is also a stepping motor (22) fixed by bolts. After the driving shaft of the stepping motor (22) passes through the sliding frame (18), there is a spur gear (23) fixedly connected.

5. The automatic double-head drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 3, characterized in that At the end of the driving shaft of the second screw motor (31), there is a first bidirectional screw rod (32) fixedly installed. On the outside of the first bidirectional screw rod (32), there are two second screw sliders (33) symmetrically distributed and threadedly connected. Above the second screw sliders (33), there are clamping frames (34) fixedly installed. On the adjacent ends of the clamping frames (34), there are rubber buffer plates (35) fixed by glue. Inside the installation groove (15), there is a lifting table (36) connected by sliding and a push block (37) connected by sliding.

6. The automatic double-head drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 5, characterized in that, The pushing block (37) is slidably connected to the lifting table (36). One end of the pushing block (37) is provided with a first hand-tightening screw (38) connected by rotation. The first hand-tightening screw (38) is threadedly connected to the second internal-thread cylinder. Inside the first internal-thread cylinder (17), there is a second hand-tightening screw (39) connected by thread. One end of the second hand-tightening screw (39) is provided with a push plate (40) connected by rotation.

7. The automatic double-head drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 1, wherein Below the outer side of the rotating table (51), there is also an externally toothed ring (52) fixedly connected. The externally toothed ring (52) meshes with the spur gear (23). Inside the rotating table (51), there is a third lead screw motor (54) fixedly connected. The end of the drive shaft of the third lead screw motor (54) is provided with a second bidirectional lead screw (55) fixedly connected. On the outer side of the second bidirectional lead screw (55), there are symmetrically distributed lead screw sliders (56) connected by thread. Above the lead screw sliders (56), a drilling machine (57) is fixedly installed by bolts. One end of the drilling machine (57) is equipped with a drill bit (58).

8. The automatic double-head drilling machine for tennis rackets based on adaptive positioning and clamping according to claim 1, characterized in that The drive shaft of the second electric telescopic cylinder (61) passes through the first mounting bracket (25) or the second mounting bracket (53) and then is provided with a hollow cylinder (62) fixedly connected. Above the hollow cylinder (62), a micro electric cylinder (63) is fixedly provided. Inside the hollow cylinder (62), there is also a telescopic rod (64) sleeved and slidably connected. One end of the telescopic rod (64) is provided with a formed mounting circular plate (66). Between the mounting circular plate (66) and the hollow cylinder (62), there is a first telescopic spring (65) fixedly connected. On one side of the mounting circular plate (66), there is a V-shaped frame (67) connected by rotation. On both sides of the V-shaped frame (67), there are second telescopic springs (69) fixedly connected. The other ends of the second telescopic springs (69) are fixedly connected to the mounting circular plate (66). At both ends of the V-shaped frame (67), there are also clamping rollers (68) connected by rotation.

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