hole opener

Abstract

The application relates to a hole opener and belongs to the technical field of hole openers. The hole opener comprises a cylindrical blade, a locking assembly, a clamping piece and a circumferential positioning assembly, the bottom of the cylindrical blade is provided with a mounting hole; the clamping piece is provided with opposite first and second ends, the first end is provided with an abutting portion, the clamping piece penetrates through the mounting hole, the second end extends to the outside of the cylindrical blade, and the abutting portion abuts against the inner side of the bottom of the cylindrical blade; the locking assembly can lock or unlock the part of the clamping piece extending out of the cylindrical blade, and the locking assembly abuts against the outer side of the bottom of the cylindrical blade when the locking assembly locks the clamping piece; the circumferential positioning assembly cooperates with the locking assembly and the cylindrical blade to fix the relative position of the locking assembly and the cylindrical blade in the circumferential direction of the cylindrical blade. The hole opener is simple and fast in dismounting the cylindrical blade, and can quickly dismount and replace the cylindrical blade according to user requirements.

Description

Technical Field

[0001] The application relates to the field of hole openers, and in particular to a hole opener. Background Technology

[0002] With societal progress and development, people often need to drill holes in wood panels, cement boards, metal sheets, or similar materials such as walls or panels. To facilitate drilling, cylindrical blades with cutting teeth on their edges have been developed.

[0003] Typically, a cylindrical cutting edge has serrated cutting teeth, with a drill bit passing through its center. When the operator uses the drill bit, it rotates the cylindrical cutting edge, causing friction and cutting against the workpiece through the cutting teeth, thus drilling a hole. After the operator completes the cutting, waste material remains in the cylindrical cutting edge. When the operator removes the cylindrical cutting edge from the hole, the waste material is also removed, completing the drilling process. When drilling holes of different sizes, the operator needs to disassemble the cylindrical cutting edge and install a cylindrical cutting edge that matches the required hole size.

[0004] However, the disassembly and assembly of the cylindrical blade in the relevant technology is cumbersome and inconvenient. Utility Model Content

[0005] To facilitate the replacement of the cylindrical blade by operators, this utility model application provides a hole opener, which adopts the following technical solution: This utility model application provides a hole opener, comprising: A cylindrical blade, wherein the bottom of the cylindrical blade is provided with a mounting hole; The clamping member has a first end and a second end opposite to each other. The first end is provided with an abutment portion. The clamping member passes through the mounting hole. The second end extends to the outside of the cylindrical blade. The abutment portion abuts against the inner side of the bottom of the cylindrical blade. A locking component is operable to lock or unlock the portion of the clamping member extending from the cylindrical blade. When the locking component locks the clamping member, the locking component abuts against the outer side of the bottom of the cylindrical blade. A circumferential positioning component, which cooperates with the locking component and the cylindrical blade to fix the relative positions of the locking component and the cylindrical blade in the circumferential direction of the cylindrical blade.

[0006] In this embodiment, the position of the cylindrical blade in the axial and circumferential directions is limited by the cooperation of the clamping fastener, the locking component, and the circumferential positioning component. When replacing the cylindrical blade, the locking component is unlocked and the clamping fastener is removed from the cylindrical blade, thus removing the cylindrical blade. This operation is simple and quick, and the cylindrical blade can be quickly replaced according to the user's needs.

[0007] In one possible embodiment, the locking assembly includes a mounting block and a locking element, the mounting block having a slide groove and a mounting slot, the mounting slot communicating with the slide groove; The portion of the clamp extending beyond the cylindrical blade extends into the mounting groove, and the portion of the clamp extending beyond the cylindrical blade is provided with a locking engagement structure; The locking member is placed in the slide groove, and the locking member is at least able to slide between the locked position and the unlocked position. When the locking member is in the locked position, the locking member is engaged with the locking engagement structure to lock the clamping fastener. When the locking member slides to the unlocked position, the locking member disengages from the locking engagement structure.

[0008] In one possible embodiment, the locking assembly further includes a reset member, at least a portion of which is located within the groove, the reset member being configured to reset the locking member to the locked position.

[0009] In one possible embodiment, the groove communicates with the first side of the mounting block to form a through opening; The locking mechanism is a groove; The locking member is provided with a storage groove, and the inner wall of the storage groove opposite to the first side is provided with a locking protrusion; when the locking member is in the locked position, the part of the clamping member with a groove is located in the storage groove, and the locking protrusion is engaged in the groove; when the locking member is unlocked, the locking member is pressed from one side of the through opening, and the locking protrusion moves out of the groove.

[0010] In one possible embodiment, the mounting groove extends through both opposite sides of the mounting block, and the mounting groove is an irregularly shaped slot. The hole opener also includes a detachable connecting rod connected to the mounting block. The connecting rod extends into the mounting groove and passes through the clamping fastener. At least the section of the connecting rod extending into the mounting groove is a non-circular section that mates with the mounting groove. The end of the connecting rod near the cylindrical cutting edge is provided with a receiving space, and a detachable drill bit is provided in the receiving space.

[0011] In one possible embodiment, the connecting rod is provided with a through hole communicating with the receiving space; The mounting block is provided with a first locking hole corresponding to the through hole. A first locking member is provided in the first locking hole. The first locking member is configured to extend into the receiving space from the through hole to lock the drill bit or to exit the receiving space to unlock the drill bit.

[0012] In one possible embodiment, the connecting rod is provided with a fixing groove; The mounting block is provided with a second locking hole corresponding to the fixing groove. A second locking member is provided in the second locking hole. The second locking member is configured to be operable to extend into the fixing groove to lock the connecting rod or to exit the fixing groove to unlock the connecting rod.

[0013] In one possible embodiment, the bottom of the cylindrical blade is provided with a first through hole; The hole opener also includes a chip removal assembly, which includes a push rod, a push block and a limiting member. The push rod passes through the first through hole, and the end of the push rod away from the first through hole is connected to the push block. One end of the limiting member is connected to the push block, and the other end of the limiting member is provided with an elastic head. The end of the limiting member with the elastic head abuts against the connecting rod, and the elastic head is compressed.

[0014] In one possible embodiment, the chip removal assembly is the circumferential positioning structure; The mounting block is provided with a second through hole, and the push rod passes through the second through hole and the first through hole, extending into the cylindrical blade. When the chip removal assembly is in the initial position, part of the push rod is located in the first through hole.

[0015] In one possible embodiment, the limiting member has an opening at one end with an elastic head; The elastic head includes a ball head and an elastic element. The ball head is installed in the opening, and a portion of the ball head protrudes from the opening. The elastic element is disposed between the ball head and the bottom wall of the opening.

[0016] In one possible embodiment, the connecting rod is provided with a limiting groove and a guide groove, the guide groove extending in the length direction of the connecting rod, and one end of the guide groove communicating with the limiting groove; When the chip removal assembly is in its initial position, the elastic head is located in the limiting groove; the side wall of the limiting groove near the guide groove is an inclined surface, and the angle between the inclined surface and the bottom wall of the limiting groove is an obtuse angle, so that the elastic element is compressed at least when the ball head slides out of the limiting groove. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a hole punch.

[0018] Figure 2 This is an exploded view of the overall structure.

[0019] Figure 3 This is a front view of the overall structure.

[0020] Figure 4 yes Figure 3 Cross-sectional view of AA.

[0021] Figure 5 It refers to the positional relationship between the clamping element and the locking element when the clamping element is in the locked position.

[0022] Explanation of reference numerals in the attached figures: 1. Cylindrical cutting edge; 11. Mounting hole; 12. First through hole; 2. Clamping fastener; 21. Groove; 22. Abutment part; 3. Locking assembly; 31. Mounting block; 311. Slide groove; 312. First side; 32. Locking element; 321. Locking protrusion; 322. Storage slot; 33. First locking element; 34. Second locking element; 35. Second through hole; 36. Reset element; 4. Connecting rod; 41. Drill bit; 42. Limiting groove; 43. Guide groove; 5. Push rod; 51. Push block; 52. Limiting element. Detailed Implementation

[0023] The application will be further described in detail below with reference to all the attached figures.

[0024] Reference Figures 1 to 5 The hole opener of this application embodiment includes a cylindrical blade 1, a clamping member 2, a locking component 3, and a circumferential positioning component. The cylindrical blade 1 has a mounting hole 11 at its bottom. The clamping member 2 has a first end and a second end opposite to each other. The first end has an abutment portion 21 that passes through the mounting hole 11. The second end extends to the outside of the cylindrical blade 1, and the abutment portion 21 abuts against the inner side of the bottom of the cylindrical blade 1. The locking component 3 is operable to lock or unlock the portion of the clamping member 2 extending out of the cylindrical blade 1. When the locking component 3 locks the clamping member 2, the locking component 3 abuts against the outer side of the bottom of the cylindrical blade 1. In other words, the locking component 3 has a locked state and an unlocked state. In the locked state, the locking component 3 locks the part of the clamping member 2 that extends out of the cylindrical blade 1. At this time, the locking component 3 abuts against the outer side of the bottom of the cylindrical blade 1, and the abutting part 21 abuts against the inner side of the bottom of the cylindrical blade 1. The locking component 3 and the abutting part 21 cooperate to clamp the cylindrical blade 1, restricting the position of the cylindrical blade 1 in the axial direction. That is, the position of the cylindrical blade 1 in the axial direction is limited by the cooperation of the locking component 3 and the clamping member 2. In the unlocked state, the locking component 3 unlocks the locking of the clamping member 2, so that the clamping member 2 can be removed from the cylindrical blade 1.

[0025] In this embodiment, the circumferential positioning component cooperates with the locking component 3 and the cylindrical blade 1 to fix the relative positions of the locking component 3 and the cylindrical blade 1 in the circumferential direction of the cylindrical blade 1. That is, the circumferential positioning component is used to limit the position of the cylindrical blade 1 in its circumferential direction, so that it cannot rotate relative to the locking component 3.

[0026] In this embodiment, when disassembling the hole opener, the locking component 3 is unlocked, and the clamping component 2 is removed from the cylindrical blade 1, thus removing the cylindrical blade 1. This operation is simple and quick, and the cylindrical blade 1 can be quickly replaced according to the user's needs.

[0027] In some embodiments of this application, the locking component 3 includes a mounting block 31 and a locking member 32. The mounting block 31 is provided with a sliding groove 311 and a mounting slot, and the mounting slot communicates with the sliding groove. The portion of the clamping member 2 extending out of the cylindrical blade 1 extends into the mounting slot, and the portion of the clamping member 2 extending out of the cylindrical blade 1 is provided with a locking engagement structure. The locking member 32 is placed in the sliding groove, and the locking member 32 slides at least between a locked position and an unlocked position. When the locking member 32 is in the locked position, the locking member 32 is engaged with the locking engagement structure of the clamping member 2, locking the clamping member 2. When the locking member 32 slides to the unlocked position, the locking member 32 exits the locking engagement structure of the clamping member 2. That is, when the locking member 32 is in the locked position, the clamping member 2 is locked; when the locking member 32 is in the unlocked position, the locking member 32 releases the lock on the clamping member 2, and the clamping member 2 can be removed from inside the mounting block 31. Therefore, the locking and unlocking methods of the locking component in the embodiments of this application are simple and easy to operate.

[0028] In some embodiments of this application, the locking component 3 further includes a reset member 36, at least partially located inside the groove. The reset member 36 is configured to reset the locking member 32 to the locked position. When the operator does not operate the locking component 3, the reset member 36 moves the locking member 32 to the locked position. This configuration not only prevents the cylindrical blade 1 from falling off due to the operator forgetting to fix the clamping member 2, but also effectively ensures the fixation of the clamping member 2 during the use of the hole opener, thereby achieving the stability of the clamping of the cylindrical blade 1.

[0029] like Figure 2 As shown, the sliding groove is connected to the first side 312 of the mounting block 31, forming a through opening, and the locking engagement structure is a groove 21. The locking member 32 is provided with a storage groove 322, and the inner wall of the storage groove 322 facing away from the first side 312 is provided with a locking protrusion 321. When the locking member 32 is in the locked position, the part of the clamping member 2 with the groove 21 is located in the storage groove 322, and the locking protrusion 321 is locked in the groove 21. When unlocking the locking member 32, the user can press the locking member 32 from one side of the through opening, thereby causing the locking protrusion 321 to move out of the groove 21, and thus the locking member 32 unlocks the clamping member 2. In other words, in this embodiment, the locking member 32 can be unlocked by pressing the locking member 32, and the locking member 32 locks the clamping member 2 by releasing the force of pressing the locking member 32, which is simple to operate.

[0030] For example, the reset element 36 is a spring.

[0031] In this embodiment, when it is necessary to fix the clamp 2, the operator can press the locking member 32 to the unlocked position, allowing one end of the clamp 2 with the groove to pass through the inside of the cylindrical blade 1, through the mounting hole 11 and the mounting groove, and into the storage slot 322. Releasing the locking member 32 causes the spring to push the locking member 32 back to its original position, and the locking protrusion 321 extends into the groove 21, locking the position of the clamp 2. When disassembling the clamp 2, pressing the locking member 32 compresses the spring, causing the locking protrusion 321 to retract from the groove 21, releasing the locking protrusion 321 from the clamp 2. Thus, the clamp 2 can be removed, and the cylindrical blade 1 can be removed.

[0032] In this embodiment, the mounting groove extends through both opposite sides of the mounting block 31, and the mounting groove is an irregularly shaped slot. The hole punch also includes a detachable connecting rod 4 connected to the mounting block 31. The connecting rod 4 is used to connect to a power tool (e.g., an electric drill) that drives the hole punch to rotate. The connecting rod 4 extends into the mounting groove and passes through the clamping fastener 2. At least the section of the connecting rod 4 extending into the mounting groove is an irregularly shaped section that mates with the mounting groove. Thus, rotation of the connecting rod 4 can drive rotation of the mounting block 31. The relative positions of the mounting block 31 and the cylindrical blade 1 in the circumferential direction of the cylindrical blade 1 are defined by a circumferential positioning component. Therefore, rotation of the mounting block 31 can simultaneously drive rotation of the cylindrical blade 1. One end of the connecting rod 4 near the cylindrical blade 1 has a receiving space, and a detachably connected drill bit 41 is provided in the receiving space. The drill bit 41 is installed in the receiving space of the connecting rod 4, and the drill bit 41 and the connecting rod 4 are detachably connected. This arrangement facilitates the replacement of severely worn drill bits 41.

[0033] For example, the mounting slot is a hexagonal slot, and the connecting rod 4 is a rod with a hexagonal cross-section.

[0034] To facilitate disassembly of the drill bit 41 by the operator, the connecting rod 4 is provided with a through hole communicating with the receiving space. The mounting block 31 is provided with a first locking hole corresponding to the through hole, and a first locking member 33 is provided in the first locking hole. The first locking member 33 is configured to be operable to extend into the receiving space through the through hole to lock the drill bit 41, or to exit the receiving space to unlock the drill bit 41. That is to say, the first locking member 33 has a locked state and an unlocked state. The user can lock the drill bit 41 by extending the first locking member 33 into the receiving space through the through hole, or unlock the drill bit 41 by exiting the receiving space. The first locking member 33 facilitates the detachable connection between the drill bit 41 and the connecting rod 4.

[0035] To facilitate packaging and transportation of the hole opener and allow for flexible replacement of various components, the connecting rod 4 is provided with a fixing groove. The mounting block 31 has a second locking hole corresponding to the fixing groove, and a second locking element 34 is provided within the second locking hole. The second locking element 34 is configured to be operable by extending into the fixing groove to lock the connecting rod 4 or by retracting from the fixing groove to unlock the connecting rod 4. In other words, the second locking element 34 has a locked state and an unlocked state. The user can lock the connecting rod 4 by inserting the second locking element 34 into the fixing groove, or unlock the connecting rod 4 by retracting the second locking element 34 from the fixing groove. The second locking element 34 facilitates the detachable connection between the connecting rod 4 and the mounting block 31. This design reduces the volume of the packaging container for the hole opener and allows for flexible replacement of various components.

[0036] For example, the first locking member 33 and the second locking member 34 are set screws, and both the first locking hole and the second locking hole are threaded. The first locking member 33 is threadedly connected to the first locking hole, and the second locking member 34 is threadedly connected to the second locking hole. When the first locking member 33 locks the drill bit 41, the end of the first locking member 33 extends through the first locking hole and the through hole, and abuts against the drill bit 41 to lock the drill bit 41. When the second locking member 34 locks the connecting rod 4, the second locking member 34 extends through the second locking hole and into the fixing groove to lock the connecting rod 4. That is, in this embodiment, the drill bit 41 can be locked by turning the first locking member 33, and the drill bit 41 can be unlocked by turning the first locking member 33 in the opposite direction. Similarly, the connecting rod 4 can be locked by turning the second locking member 34, and the connecting rod 4 can be unlocked by turning the second locking member 34 in the opposite direction.

[0037] In this embodiment, the bottom of the cylindrical cutting edge 1 is provided with a first through hole 12. The hole opener also includes a chip removal assembly, which is used to remove the waste chips left inside the cylindrical cutting edge 1 after drilling. That is, after drilling, waste chips will remain inside the cylindrical cutting edge 1. At this time, by pushing the chip removal assembly closer to the cylindrical cutting edge 1, the chip removal assembly will push out the waste chips inside the cylindrical cutting edge 1. In this embodiment, the chip removal assembly includes a push rod 5, a push block 51, and a limiting member 52. The push rod 5 passes through the first through hole 12. The end of the push rod 5 away from the first through hole 12 is connected to the push block 51. One end of the limiting member 52 is connected to the push block 51. The other end of the limiting member 52 is provided with an elastic head. The end of the limiting member 52 with the elastic head abuts against the connecting rod 4, and the elastic head is compressed. The limiting member 52 abuts against the connecting rod 4, compressing the elastic head. The reaction force of the compressed elastic head restricts the position of the chip removal assembly, allowing it to remain in a fixed position when not under force. When the chip removal assembly is under force, such as when the user pushes the push block 51, the chip removal assembly can move back and forth along the length of the connecting rod 4 to eject the waste chips inside the cylindrical blade 1, or return to its initial position. The elastic head, without affecting the movement of the chip removal assembly, can limit its position when it is not under force, facilitating both position limitation and movement. In this embodiment, the initial position of the chip removal assembly refers to its normal position, i.e., the position when the hole opener is drilling. For example, the initial position of the chip removal assembly is the position where the push block 51 is away from the cylindrical blade 1. After the chip removal assembly ejects the waste chips inside the cylindrical blade 1, it moves from its initial position towards a position closer to the cylindrical blade 1.

[0038] In the embodiments of this application, the circumferential positioning component can be a positioning protrusion disposed on the mounting block 31, or it can be a chip removal component in the embodiments of this application.

[0039] For example, in some embodiments of this application, when the circumferential positioning component is a positioning protrusion provided on the mounting block 31, the bottom of the cylindrical blade 1 is provided with a positioning hole. The positioning protrusion and the positioning hole cooperate to restrict the position of the cylindrical blade 1 in the circumferential direction, so that the cylindrical blade and the mounting block 31 will not rotate relative to each other.

[0040] For example, in some other embodiments of this embodiment, the circumferential positioning component is a chip removal component. That is, the chip removal component is used on the one hand to remove the waste chips in the cylindrical blade 1, and on the other hand to serve as a circumferential positioning structure to define the relative position of the cylindrical blade 1 and the mounting block 31 in the circumferential direction of the cylindrical blade 1.

[0041] The following detailed explanation uses the circumferential positioning component as an example of a chip removal component.

[0042] like Figure 2As shown, the mounting block 31 has a second through hole 35. The push rod 5 passes through the second through hole 35 and the first through hole 12, extending into the cylindrical blade 1. When the chip removal assembly is in its initial position, part of the push rod 5 is located in the first through hole 12. In this embodiment, the chip removal assembly being in its initial position refers to its normal position, i.e., the position of the chip removal assembly when the hole opener is drilling. When the chip removal assembly is in its initial position, part of the push rod 5 is located in the second through hole 35. That is, when the chip removal assembly is in its initial position, the push rod 5 passes through the second through hole 35, passes through the first through hole 12, or extends into the first through hole 12. Thus, when the chip removal assembly is in its initial position, it can act as a circumferential positioning component, defining the relative position of the cylindrical blade 1 and the mounting block 31 in the circumferential direction of the cylindrical blade 1. When the power tool drives the connecting rod 4 to rotate, the connecting rod 4 drives the mounting block 31 to rotate. The cylindrical blade 1 rotates synchronously under the action of the connecting rod 4 and the push rod 5, and the push rod 5 rotates synchronously under the action of the cylindrical blade 1.

[0043] In some embodiments of this application, the limiting member has an opening at one end with an elastic head. The elastic head includes a ball head and an elastic element. The ball head is installed in the opening, with a portion of the ball head protruding from the opening. The elastic element is disposed between the ball head and the bottom wall of the opening. That is, when the chip removal assembly is installed on the connecting rod 4, the elastic element is compressed, and the reaction force of the elastic element pushes the ball head to abut against the connecting rod 4. The ball head, the elastic element, and the limiting member 52 cooperate to restrict the position of the chip removal assembly, so that the chip removal assembly can remain in a fixed position when no force is applied, and when the chip removal assembly is subjected to force, such as when the user pushes the push block 51, the chip removal assembly can move back and forth along the length direction of the connecting rod 4.

[0044] For example, to facilitate user operation of the moving chip removal assembly and to quickly and accurately move the chip removal assembly back to its initial position, the connecting rod 4 is provided with a limiting groove 42 and a guide groove 43. The guide groove 43 extends along the length of the connecting rod 4, and one end of the guide groove 43 communicates with the limiting groove 42. When the chip removal assembly is in its initial position, the elastic head is located within the limiting groove 42. The side wall of the limiting groove 42 near the guide groove 43 is an inclined surface, and the angle between the inclined surface and the bottom wall of the limiting groove 42 is an obtuse angle. At least when the ball head slides out of the limiting groove 42, the elastic element is compressed. The limiting groove 42 enables the chip removal assembly to move quickly and accurately to its initial position, the inclined surface facilitates the sliding of the limiting element out of the limiting groove 42, and the guide groove 43 facilitates the movement of the chip removal assembly.

[0045] The above are all preferred embodiments of the application and are not intended to limit the scope of protection of the application. Therefore, all equivalent changes made to the structure, shape and principle of the application should be included within the scope of protection of the application.

Claims

1. A hole opener, characterized in that, include: A cylindrical blade, wherein the bottom of the cylindrical blade is provided with a mounting hole; The clamping member has a first end and a second end opposite to each other. The first end is provided with an abutment portion. The clamping member passes through the mounting hole. The second end extends to the outside of the cylindrical blade. The abutment portion abuts against the inner side of the bottom of the cylindrical blade. A locking component is operable to lock or unlock the portion of the clamping member extending from the cylindrical blade. When the locking component locks the clamping member, the locking component abuts against the outer side of the bottom of the cylindrical blade. A circumferential positioning component, which cooperates with the locking component and the cylindrical blade to fix the relative positions of the locking component and the cylindrical blade in the circumferential direction of the cylindrical blade.

2. The hole opener according to claim 1, characterized in that: The locking component includes a mounting block and a locking element. The mounting block is provided with a sliding groove and a mounting slot, and the mounting slot communicates with the sliding groove. The portion of the clamping fastener extending beyond the cylindrical blade extends into the mounting groove, and the portion of the clamping fastener extending beyond the cylindrical blade is provided with a locking engagement structure; The locking member is placed in the slide groove, and the locking member is at least able to slide between the locked position and the unlocked position. When the locking member is in the locked position, the locking member is engaged with the locking engagement structure to lock the clamping fastener. When the locking member slides to the unlocked position, the locking member disengages from the locking engagement structure.

3. The hole opener according to claim 2, characterized in that: The locking assembly further includes a reset member, at least a portion of which is located inside the slide groove, the reset member being configured to reset the locking member to the locked position.

4. The hole opener according to claim 2, characterized in that: The groove is connected to the first side of the mounting block to form a through opening; The locking mechanism is a groove; The locking member is provided with a storage groove, and the inner wall of the storage groove opposite to the first side is provided with a locking protrusion; when the locking member is in the locked position, the part of the clamping member with a groove is located in the storage groove, and the locking protrusion is engaged in the groove; when the locking member is unlocked, the locking member is pressed from one side of the through opening, and the locking protrusion moves out of the groove.

5. A hole opener according to any one of claims 2-4, characterized in that: The mounting groove extends through both opposite sides of the mounting block, and the mounting groove is an irregularly shaped slot. The hole opener also includes a detachable connecting rod connected to the mounting block. The connecting rod extends into the mounting groove and passes through the clamping fastener. At least the section of the connecting rod extending into the mounting groove is a non-circular section that mates with the mounting groove. The end of the connecting rod near the cylindrical cutting edge is provided with a receiving space, and a detachable drill bit is provided in the receiving space.

6. A hole opener according to claim 5, characterized in that: The connecting rod is provided with a through hole that communicates with the receiving space; The mounting block is provided with a first locking hole corresponding to the through hole. A first locking member is provided in the first locking hole. The first locking member is configured to extend into the receiving space from the through hole to lock the drill bit or to exit the receiving space to unlock the drill bit.

7. A hole opener according to claim 6, characterized in that: The connecting rod is provided with a fixing groove; The mounting block is provided with a second locking hole corresponding to the fixing groove. A second locking member is provided in the second locking hole. The second locking member is configured to be operable to extend into the fixing groove to lock the connecting rod or to exit the fixing groove to unlock the connecting rod.

8. A hole opener according to claim 5, characterized in that: The bottom of the cylindrical blade is provided with a first through hole; The hole opener also includes a chip removal assembly, which includes a push rod, a push block and a limiting member. The push rod passes through the first through hole, and the end of the push rod away from the first through hole is connected to the push block. One end of the limiting member is connected to the push block, and the other end of the limiting member is provided with an elastic head. The end of the limiting member with the elastic head abuts against the connecting rod, and the elastic head is compressed.

9. A hole opener according to claim 8, characterized in that: The chip removal assembly is the circumferential positioning structure; The mounting block is provided with a second through hole, and the push rod passes through the second through hole and the first through hole, extending into the cylindrical blade. When the chip removal assembly is in the initial position, part of the push rod is located in the first through hole.

10. A hole opener according to claim 9, characterized in that: The limiting member has an opening at one end with an elastic head; The elastic head includes a ball head and an elastic element. The ball head is installed in the opening, and a portion of the ball head protrudes from the opening. The elastic element is disposed between the ball head and the bottom wall of the opening.

11. A hole opener according to claim 10, characterized in that: The connecting rod is provided with a limiting groove and a guide groove. The guide groove extends along the length of the connecting rod, and one end of the guide groove is connected to the limiting groove. When the chip removal assembly is in its initial position, the elastic head is located in the limiting groove; the side wall of the limiting groove near the guide groove is an inclined surface, and the angle between the inclined surface and the bottom wall of the limiting groove is an obtuse angle, so that the elastic element is compressed at least when the ball head slides out of the limiting groove.

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