A drill bit changing disc and drill bit conversion mechanism

Abstract

This utility model discloses a drill bit changing disc and a drill bit switching mechanism. The drill bit changing disc includes: a drill bit changing base plate with drill bit changing holes, each drill bit changing hole having a buffer mechanism; the buffer mechanism includes: a buffer rod, a buffer spring, and a buffer stop. The end of the buffer rod passes through the drill bit changing hole, the buffer stop is installed at the beginning of the buffer rod, the buffer spring is sleeved on the buffer rod, and one end of the buffer spring is connected to the bottom of the buffer stop, and the other end of the buffer spring is connected to the root of the drill bit changing hole; a drill bit fixing block is provided on the end face of the buffer stop, and the drill bit fixing block rotates on the end face of the buffer stop under force; the buffer mechanism moves back and forth in the drill bit changing hole driven by an external force. This utility model increases the friction between the drill bit and the disc by setting a buffer mechanism, ensuring sufficient friction to fix the drill bit until the drill chuck aligns with the drill bit chuck when changing drill bits, reducing the risk that the drill bit will rotate and fail to align with the chuck when changing drill bits.

Description

Technical Field

[0001] This utility model relates to the field of drilling machines, and in particular to a drill bit changing disc and a drill bit switching mechanism. Background Technology

[0002] Currently, when drilling machines on the market perform automatic drill bit changing, the electric drill needs to insert the old drill bit into the corresponding drill bit changing disc, and then move to the drill bit that needs to be replaced for replacement. However, during the process of replacing the drill bit, the electric drill is directly engaged with the drill bit that needs to be replaced. There is a situation where the drill bit chuck and the electric drill chuck cannot align, which causes the electric drill to be unable to lock with the drill bit and pull it out.

[0003] Therefore, we propose a drill bit changing and drill bit switching mechanism to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a drill bit changer and drill bit conversion mechanism. By setting a buffer mechanism, the buffer mechanism increases the friction between the drill bit and the cutter head, ensuring that there is enough friction to fix the drill bit until the drill slot and the drill bit slot are aligned when changing the drill bit. This reduces the risk that the drill bit will not be aligned with the slot when the drill is rotated during the drill bit change.

[0005] Accordingly, this utility model proposes a drill changer disc, which includes: a drill changer base plate having multiple drill changer holes, and a buffer mechanism being provided in each drill changer hole;

[0006] The buffer mechanism includes a buffer rod, a buffer spring, and a buffer stop. The end of the buffer rod passes through the change hole, the buffer stop is installed at the head end of the buffer rod, the buffer spring is sleeved on the buffer rod, and one end of the buffer spring is connected to the bottom of the buffer stop, and the other end of the buffer spring is connected to the root of the change hole.

[0007] A drill bit fixing block is provided on the end face of the buffer block, and the drill bit fixing block rotates on the end face of the buffer block under force.

[0008] The buffer mechanism is driven by an external force to move back and forth along the working direction in the borehole.

[0009] Preferably, the bottom of the drill bit fixing block is provided with multiple limiting parts, and the multiple limiting parts are distributed in an array with the center of the drill bit fixing block as the reference.

[0010] Preferably, the buffer block has multiple curved grooves on its end face near the drill bit fixing block, and the multiple grooves are evenly distributed along the edge of the buffer block.

[0011] Preferably, any of the limiting portions abuts against the end face of the buffer block, and the limiting portion is adapted to abut against the corresponding curved groove.

[0012] Preferably, a hollow cylindrical buffer silicone pad is provided inside any of the drill holes, and the surface of the buffer silicone pad abuts against the inner wall of the drill hole.

[0013] Preferably, a snap-fit ​​groove is provided on the inner wall of any of the drill holes, and a snap-fit ​​boss matching the snap-fit ​​groove is provided on the surface of any of the buffer silicone pads.

[0014] Preferably, any of the aforementioned buffer silicone pads includes a first buffer portion and a second buffer portion, wherein the inner diameter of the first buffer portion is R1 and the inner diameter of the second buffer portion is R2, satisfying the relationship: R1 > R2.

[0015] Preferably, the buffer rod includes a first connecting rod and a second connecting rod, wherein the surface of the second connecting rod is recessed toward the axis of the second connecting rod to form a plane;

[0016] The first connecting rod and the second connecting rod are integrally formed.

[0017] Preferably, the bottom of the drill hole is provided with a buffer hole that is the same shape as the second connecting rod, the second connecting rod is inserted into the buffer hole, and the inner wall of the buffer hole abuts against the surface of the second connecting rod.

[0018] This utility model also proposes a drill bit switching mechanism, which includes: the aforementioned drill bit switching disc and a first rotating motor, wherein the drill bit switching disc is driven to rotate by the first rotating motor.

[0019] The beneficial effects of this utility model are:

[0020] This invention increases the friction between the drill bit and the drill changer disc by incorporating a buffer mechanism. This ensures sufficient friction to hold the drill bit in place until the drill chuck aligns with the drill bit chuck during drill bit replacement. This reduces the risk of the drill rotating and failing to align the drill bit with the chuck during replacement. The buffer mechanism also increases friction between the stationary drill bit and the drill changer hole, improving the drill bit's stability and reducing the risk of it falling out. Furthermore, it avoids situations where the drill bit is directly inserted into the drill changer disc, causing a misalignment between the drill chuck and the drill bit chuck. This improves drill replacement efficiency and reduces the risk of the drill motor burning out due to the buffer mechanism jamming the drill bit and preventing the drill from rotating. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the conversion drill bit mechanism in this utility model;

[0023] Figure 2 This is a schematic diagram of the drill bit changer in this utility model;

[0024] Figure 3 This is a quarter-section view of the drill bit changer disc in this utility model;

[0025] Figure 4 This is a cross-sectional view of the drill bit changer disc in this utility model;

[0026] Figure 5 yes Figure 4 Enlarged view of point A in the image;

[0027] Figure 6 This is a schematic diagram of the buffer mechanism in this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the buffer silicone pad in this utility model;

[0029] Figure 8 This is a schematic diagram of the first structure of the drill bit fixing block in this utility model;

[0030] Figure 9 This is a schematic diagram of the second structure of the drill bit fixing block in this utility model;

[0031] Figure 10 This is a schematic diagram of the structure of the buffer block in this utility model.

[0032] In the attached diagram: 1. Drill changing chassis; 11. Drill changing hole; 111. Snap-fit ​​groove; 2. Buffer mechanism; 21. Buffer rod; 211. First connecting rod; 212. Second connecting rod; 22. Buffer spring; 23. Buffer stop block; 231. Curved groove; 232. Hemispherical boss; 24. Drill bit fixing block; 241. Limiting part; 3. Buffer silicone pad; 31. First buffer part; 32. Second buffer part; 33. Snap-fit ​​boss; 4. Four-jaw cylinder; 5. First rotating motor. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] Figure 1 A schematic diagram of the drill bit conversion mechanism in this utility model is shown. Figure 2 This invention presents a schematic diagram of the drill bit changer disc. Figure 3 This is a quarter-sectional view of the drill bit changer disc in this invention. Figure 4 A schematic diagram of the buffer mechanism in this utility model is shown. Figure 5 A schematic diagram of the structure of the buffer silicone pad in this utility model is shown. Figure 6 This diagram shows the first structural schematic of the drill bit fixing block in this invention. Figure 7 This invention shows a schematic diagram of the second structure of the drill bit fixing block. Figure 8A schematic diagram of the buffer stop block in this utility model is shown. The drill changer disc includes: a drill changer base 1, which has multiple drill changer holes 11, and a buffer mechanism 2 is provided in each drill changer hole 11; the buffer mechanism 2 includes: a buffer rod 21, a buffer spring 22, and a buffer stop 23. The end of the buffer rod 21 passes through the drill changer hole 11, the buffer stop 23 is installed at the head end of the buffer rod 21, the buffer spring 22 is sleeved on the buffer rod 21, and one end of the buffer spring 22 is connected to the bottom of the buffer stop 23, and the other end of the buffer spring 22 is connected to the root of the drill changer hole 11; a drill bit fixing block 24 with a cross groove is provided on the end face of the buffer stop 23, and the drill bit fixing block 24 rotates on the end face of the buffer stop 23 under force; the buffer mechanism 2 moves back and forth in the drill changer hole 11 along the working direction under the drive of external force. In this embodiment, the drill changing chassis 1 has eight drill changing holes 11, and each drill changing hole 11 is provided with a buffer mechanism 2. Each drill changing hole 11 can be used to insert a drill bit. The buffer mechanism 2 is used to increase the friction between the drill bit and the drill changing cutter head, so as to ensure that there is enough friction to fix the drill bit until the drill slot and the drill bit slot are aligned when changing the drill bit. This reduces the risk of the drill bit rotating and failing to align with the slot when changing the drill bit. At the same time, the buffer mechanism 2 can also increase the friction between the drill bit and the drill changing hole 11 when the drill bit is stationary, thereby increasing the stability of the drill bit when it is stationary in the drill changing hole 11 and reducing the risk of the drill bit falling out of the corresponding drill changing hole 11 on its own. The working direction of the buffer mechanism 2 is to move back and forth along the inner wall of the drill changing hole 11, so that the buffer spring 22 switches between a compressed state and a natural state. The buffer spring 22 is used to absorb the impact force of the drill bit inserted into the corresponding drill changing hole. When the buffer spring 22 is in the compressed state, it absorbs the impact force output by the drill bit to the buffer mechanism 2. When the buffer spring 22 is in the natural state, that is, when the drill bit is pulled out of the corresponding drill changing hole, it releases the impact force output by the drill bit to the buffer mechanism 2.

[0035] Specifically, when the drill bit needs to be replaced, the old drill bit needs to be placed into the corresponding drill bit replacement hole 11 before installing the new drill bit. The process of placing the old drill bit into the corresponding drill bit replacement hole 11 involves inserting the drill bit into the corresponding drill bit replacement hole 11. The drill bit is directly inserted into the corresponding drill bit replacement hole 11, and the end of the drill bit abuts against the end face of the buffer mechanism 2, thereby increasing the friction between the drill bit and the drill bit replacement disc. Then, the drill rotates in the opposite direction to disengage the chuck inside the drill from the chuck of the drill bit, thereby disassembling the drill and the drill bit.

[0036] The process of replacing a drill bit with a new one involves the drill slowly rotating until it reaches the corresponding drill bit. As the drill's chuck aligns with the chuck of the new drill bit, the drill is inserted into the corresponding mounting hole and rotates. The rotation of the drill exerts a force on the drill bit, but the buffer mechanism 22 provides friction, preventing the drill bit from rotating under the drill's influence. This continues until the drill rotates slowly enough for the chuck inside to align with the chuck of the new drill bit. Once aligned, the drill changes its output power to a higher speed, causing the drill bit to rotate. At this point, the force exerted by the drill on the drill bit is greater than the friction provided by the buffer mechanism 2, causing the drill bit to rotate under the drill's influence. Finally, the drill spirally pulls the drill bit out of the corresponding replacement hole 11. This design avoids the situation where the slots in the electric drill and the drill bit cannot be aligned when the drill bit is directly inserted into the corresponding drill bit changer. This helps to improve drill changing efficiency and reduces the risk of the electric drill motor burning out if the buffer mechanism 2 jams the drill bit and fails to rotate even after the electric drill and the drill bit slots are aligned.

[0037] Furthermore, the bottom of the drill bit fixing block 24 is provided with a plurality of limiting parts 241, which are arranged in an array with the center of the drill bit fixing block 24 as a reference. In this embodiment, the bottom of the drill bit fixing block 24 is provided with four limiting parts 241, each limiting part 241 being a triangular limiting boss, that is, any limiting part 241 gradually tapers from its root connected to the drill bit fixing block 24 toward the buffer stop 23, reducing the contact area between the limiting part 241 and the buffer stop 23, thereby reducing the friction between the limiting part 241 and the buffer stop 23, which helps to reduce the wear generated between the limiting part 241 and the buffer stop 23 when the limiting part 241 rotates, and extends the service life of the limiting part 241. The four limiting parts 241 are arranged in an array with the bottom center of the drill bit fixing block 24 as the reference, and the included angle between any two adjacent limiting parts 241 is the same, which is 90°. This arrangement can achieve dynamic balance of the drill bit fixing block 24. When the drill bit rotates at high speed, the centrifugal force generated by each limiting part 241 cancels each other out, effectively suppressing vibration and reducing the risk of damage to the drill bit caused by the drill bit fixing block 24 vibrating back and forth between the drill bit and the buffer stop 23.

[0038] Furthermore, the buffer block 23 has multiple curved grooves 231 on its end face near the drill bit fixing block 24, and these grooves are evenly distributed along the edge of the buffer block 23. In this embodiment, five curved grooves 231 are provided on the end face of the buffer block 23, with one curved groove 231 located at the center of the end face, and the other four curved grooves 231 distributed around the curved groove 231 located at the center of the end face along the edge of the end face. When the drill bit fixing block 24 is driven to rotate by the drill bit, the limiting part 241 at the bottom of the drill bit fixing block 24 enters the corresponding curved groove 231 one by one, increasing the contact area between the limiting part and the buffer block, thereby increasing the friction between the drill bit fixing block and the buffer block, converting the kinetic energy of the drill bit fixing block 24 into the internal energy of the hemispherical boss 232, thereby reducing the speed of the drill bit fixing block 24, and finally achieving simultaneous stillness of the drill bit and the drill bit fixing block 24.

[0039] Furthermore, each of the limiting portions 241 maintains contact with the end face of the buffer block 23, and the limiting portion 241 is adapted to contact the corresponding curved groove 231. In this embodiment, the limiting portion 241 maintains contact with the end face of the buffer block 23 so that the limiting portion 241 can contact the corresponding curved groove 231 one by one. When each limiting portion 241 contacts the curved groove 231, it moves along the curved groove 231, increasing the contact area between the curved groove 231 and the limiting portion, thereby increasing the friction between the curved groove 231 and the limiting portion. This converts some of the kinetic potential energy into the internal energy of the buffer block 23 and the drill bit fixing block 24, thereby reducing the speed of the drill bit fixing block 24. Finally, the drill bit and the drill bit fixing block 24 come to a stop simultaneously, achieving the purpose of reducing the speed of the drill bit.

[0040] It should be noted that a steel ball may also be provided in any of the curved grooves. The steel ball can collide with the limiting part 241. During the collision, the steel ball has a reaction force on the limiting part, thereby reducing the rotation speed of the limiting part, and thus reducing the rotation speed of the entire drill bit fixing block 24. Finally, the drill bit and the drill bit fixing block 24 are brought to a standstill at the same time, thereby achieving the purpose of reducing the speed of the drill bit.

[0041] Furthermore, a hollow cylindrical buffer silicone pad 3 is provided inside any of the drill holes 11, and the surface of the buffer silicone pad 3 abuts against the inner wall of the drill hole 11. The hollow cylindrical buffer silicone pad 3 is used to increase the friction between the drill bit and the silicone pad. When the drill bit enters the drill hole 11, the drill bit and the buffer silicone pad 3 come into contact. The buffer silicone pad 3 absorbs the impact force generated when the drill bit rotates, thus playing a buffering role. In addition, the buffer silicone pad 3 prevents the drill bit from directly contacting the inner wall of the drill hole 11, which would cause wear to the drill hole 11. This helps to buffer the impact force of the drill bit while reducing the risk of wear to the drill hole 11 due to collision with the drill bit.

[0042] Furthermore, a snap-fit ​​groove 111 is provided on the inner wall of any of the drill-changing holes 11, and a snap-fit ​​boss 33 matching the snap-fit ​​groove 111 is provided on the surface of any of the buffer silicone pads 3. In this embodiment, two snap-fit ​​grooves 111 are provided in any of the drill-changing holes 11, and the two snap-fit ​​grooves 111 extend from one end face to the other end face along the inner wall of the drill-changing hole 11. Two snap-fit ​​bosses 33 are also provided on any of the buffer silicone pads 3, and the two snap-fit ​​bosses 33 extend from one end face to the other end face along the surface of the buffer silicone pad 3, ensuring that the snap-fit ​​groove 111 and the snap-fit ​​boss 33 can match. The buffer silicone pad 3 is placed in the drill change hole 11. One of the two locking protrusions 33 engages with the corresponding locking groove 111. When the drill bit is screwed into the drill change hole 11, the locking protrusion 33 and the locking groove 111 are tightly attached to each other, increasing the contact area between the buffer silicone pad 3 and the drill change hole 11. The inner wall of the locking groove 111 exerts a force on the locking protrusion 33, preventing the locking protrusion 33 from detaching from the locking groove 111. This would prevent the buffer silicone pad 3 from rotating and detaching in the drill change hole 11 due to the influence of the drill bit, thus reducing the risk of the buffer silicone pad 3 detaching from the drill change hole 11.

[0043] Furthermore, any of the aforementioned buffer silicone pads 3 includes a first buffer portion 31 and a second buffer portion 32. The inner diameter of the first buffer portion 31 is R1, and the inner diameter of the second buffer portion 32 is R2, satisfying the relationship: R1 > R2. During the process of the drill bit stopping rotation, a significant impact force is generated. The first buffer portion 31 has a larger inner diameter, resulting in a relatively small initial contact area with the drill bit or related components. The first buffer portion 31 initially bears a portion of the impact force, providing initial buffering. As the drill bit penetrates further, reaching the second buffer portion 32 with a smaller inner diameter, the contact area increases, further increasing the resistance of the buffer silicone pad 3 to the drill bit, achieving secondary buffering. The different inner diameters of the buffer portions allow energy to be dispersed and absorbed at different stages during the drill bit's movement. Due to its large inner diameter, the first buffer portion 31 experiences relatively small deformation of the silicone pad in the initial contact with the drill bit, but it can convert some energy into the internal energy and elastic potential energy of the silicone molecules. When the drill bit enters the second buffer portion 32, the smaller inner diameter causes increased deformation of the silicone pad, further absorbing and converting energy, making the energy distribution more uniform and improving buffering efficiency.

[0044] Furthermore, the buffer rod 21 includes a first connecting rod 211 and a second connecting rod 212. The surface of the second connecting rod 212 is recessed towards the axis of the second connecting rod 212 to form a plane; the first connecting rod 211 and the second connecting rod 212 are integrally formed. In this embodiment, the first connecting rod 211 is a round rod, and the surface of the second connecting rod 212 is recessed to form a plane, making the second connecting rod 212 an irregularly shaped rod. The cross-sectional shape of the second connecting rod 212 is irregular, and under torque, the stress distribution is uneven, with stress concentration in some areas. These stress concentration areas will form "stress wedges," hindering the relative torsion of the rod, thereby improving the torsional resistance. This prevents the drill bit from getting stuck in the cross groove on the buffer stop 23 and causing the buffer stop 23 to rotate, which in turn causes the buffer rod 21 to rotate, resulting in the drill bit not being able to stop rotating in time. This helps to slow down the rotation speed of the drill bit and stop its rotation in time.

[0045] Furthermore, the bottom of the drill hole 11 is provided with a buffer hole of the same shape as the second connecting rod 212. The second connecting rod 212 is inserted into the buffer hole, and the inner wall of the buffer hole abuts against the surface of the second connecting rod 212. The second connecting rod 212 is an irregularly shaped rod. When the second connecting rod 212 is inserted into the corresponding buffer hole, the buffer hole has a restrictive effect on the second connecting rod 212, that is, it restricts the rotation angle of the second connecting rod 212. This prevents the buffer rod 21 from rotating with the drill bit fixing block 24, thus failing to provide an obstruction to the drill bit and preventing the drill bit from stopping in time. Consequently, the drill bit deviates from the predetermined hole position, which is beneficial for the drill bit to stop rotating in time and continue to move along the specified direction due to inertia during the stopping process, thereby ensuring the accuracy of the drilling position.

[0046] This utility model also proposes a drill bit conversion mechanism, which includes: the aforementioned drill bit changing disc, a four-jaw cylinder 4, and a first rotating motor 5. The four-jaw cylinder 4 is installed in the drill bit changing disc, and the drill bit changing disc is driven to rotate by the first rotating motor 5. The four-jaw cylinder 4 is used to lock the drill bit changing disc, that is, each output end of the four-jaw cylinder 4 is provided with a corresponding locking part. When the four-jaw cylinder 4 outputs power, the corresponding locking part is inserted into the corresponding drill bit changing hole 11, so that the drill bit in the drill bit changing hole 11 is locked in the drill bit changing disc, reducing the risk of the drill bit falling out of the drill bit changing disc. Each output end of the four-jaw cylinder is provided with two locking parts, that is, the four-jaw cylinder is provided with a total of eight locking parts, thereby modifying the four-jaw cylinder into an eight-jaw cylinder, which is beneficial to reduce equipment costs while ensuring simultaneous control of eight drill bit changing holes, so that the drill bits in the drill bit changing disc can be locked or released simultaneously. The output end of the rotary cylinder is connected to the drive cylinder. When the output end of the rotary cylinder starts to rotate, it drives the drive cylinder to rotate, which in turn drives the base to rotate. The rotation of the base can adjust the position of multiple drill changing holes 11. Each of the eight drill changing holes 11 is equipped with a drill bit of a different specification. By rotating the base, the eight drill changing holes 11 can be aligned with the corresponding electric drill, reducing the need for manual drill bit replacement and improving work efficiency.

[0047] In summary, increasing the friction between the drill bit and the drill changer ensures sufficient friction to hold the drill bit in place until the drill chuck aligns with the drill bit chuck during drill bit replacement. This reduces the risk of the drill rotating and failing to align the drill bit with the chuck during replacement. Simultaneously, the buffer mechanism increases friction between the stationary drill bit and the drill change hole, thereby increasing the drill bit's stability and reducing the risk of it falling out of the corresponding hole. It also avoids situations where the drill bit is directly inserted into the drill changer, causing a misalignment between the drill chuck and the drill bit chuck. This improves drill changing efficiency and reduces the risk of the drill motor burning out due to the buffer mechanism jamming the drill bit and preventing rotation.

[0048] Furthermore, the above description provides a detailed introduction to the drill bit changing disc and drill bit conversion mechanism provided in the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A reaming head, characterized in that, The drill changer includes: a drill changer base plate, which has multiple drill changer holes, and a buffer mechanism is provided in each drill changer hole; The buffer mechanism includes a buffer rod, a buffer spring, and a buffer stop. The end of the buffer rod passes through the change hole, the buffer stop is installed at the head end of the buffer rod, the buffer spring is sleeved on the buffer rod, and one end of the buffer spring is connected to the bottom of the buffer stop, and the other end of the buffer spring is connected to the root of the change hole. The buffer block is provided with a drill bit fixing block with a cross groove on its end face, and the drill bit fixing block rotates on the end face of the buffer block under force. The buffer mechanism is driven by an external force to move back and forth along the working direction in the borehole.

2. The reaming cutter head of claim 1, wherein, The bottom of the drill bit fixing block is provided with multiple limiting parts, and the multiple limiting parts are arranged in an array with the center of the drill bit fixing block as the reference.

3. The reaming cutter head of claim 2, wherein, The buffer block has multiple curved grooves on its end face near the drill bit fixing block, and the multiple grooves are evenly distributed along the edge of the buffer block.

4. The reaming cutter head of claim 3, wherein, Each of the limiting portions abuts against the end face of the buffer block, and the limiting portion is adapted to abut against the corresponding curved groove.

5. The reaming cutter head of claim 1, wherein, A hollow cylindrical buffer silicone pad is provided inside any of the aforementioned drill holes, and the surface of the buffer silicone pad abuts against the inner wall of the drill hole.

6. The reaming cutter head of claim 5, wherein, The inner wall of any of the aforementioned drill holes is provided with a snap-fit ​​groove, and the surface of any of the aforementioned buffer silicone pads is provided with a snap-fit ​​boss that matches the snap-fit ​​groove.

7. The reaming cutter head of claim 5, wherein, Each of the aforementioned buffer silicone pads includes a first buffer portion and a second buffer portion, wherein the inner diameter of the first buffer portion is R1 and the inner diameter of the second buffer portion is R2, satisfying the relationship: R1 > R2.

8. The reaming cutter head of claim 1, wherein, The buffer rod includes a first connecting rod and a second connecting rod, wherein the surface of the second connecting rod is recessed toward the axis of the second connecting rod to form a plane; The first connecting rod and the second connecting rod are integrally formed.

9. The reaming cutter head of claim 1, wherein, The bottom of the drill hole is provided with a buffer hole that is the same shape as the second connecting rod. The second connecting rod is inserted into the buffer hole, and the inner wall of the buffer hole abuts against the surface of the second connecting rod.

10. A conversion bit mechanism, characterized by, The drill bit switching mechanism includes: a drill bit changing disc as described in any one of claims 1 to 9, a four-jaw cylinder, and a first rotating motor, wherein the four-jaw cylinder is installed in the drill bit changing disc, and the drill bit changing disc is driven to rotate by the first rotating motor.

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