Hole opener

Abstract

The invention provides a tapper, and belongs to the technical field of hardware tools. The technical problem that waste materials are inconvenient to discharge in an existing tapper is solved. The tapper comprises a tapping cylinder and a connecting rod, one end of the perforated cylinder is a cutting edge end, and the other end is a connecting end; a through hole communicated to the interior of the perforated cylinder is formed in the connecting end of the perforated cylinder; one end of the connecting rod is used for being connected with an electric drill, and the other end of the connecting rod is inserted into the through hole and is in circumferential limiting and axial sliding connection with the perforated cylinder; a limiting assembly used for limiting axial movement of the connecting rod in the through hole is further arranged on the trepanning cylinder. According to the tapper, waste embedded in the tapper can be conveniently, rapidly, stably and reliably discharged, the waste embedded tightly can be easily ejected out, and normal use of the tapper cannot be affected; in addition, the connecting rod can also play a role in limiting and positioning, so that the punching depth is accurately and reliably controlled.

Description

Technical Field

[0001] This invention belongs to the field of hardware tool technology and relates to a hole opener. Background Technology

[0002] A hole saw is a specialized tool used to cut holes in various materials (such as wood, metal, plastic, tile, glass, concrete, etc.). It is widely used in home renovation, construction, pipe installation, furniture manufacturing, and electrical engineering. Compared to drill bits, hole saws are typically used to create larger diameter holes. A hole saw consists of a cylindrical opening with a wear-resistant cutting edge at one end and a connecting rod at the other end, allowing for convenient and quick hole-making operations. Because the opening cylinder has a large cavity, the waste material cut off during the opening operation will be embedded in the opening cylinder in whole blocks. After each operation, it is a very time-consuming and laborious task to remove the waste material from the opening cylinder of the opening tool. Usually, it is necessary to use tools such as screwdrivers to pry it out or crush it to make it fall off, which is very inconvenient. Currently, some hole saws on the market use a spring inside the drilling cylinder to eject waste material. However, if the spring's elasticity is too low, it will be difficult to eject the waste material; if the spring's elasticity is too high, it will affect normal drilling. In practical applications, this results in inconvenience and inconsistent performance. Summary of the Invention

[0003] In view of the above-mentioned problems existing in the prior art, the present invention provides a hole opener. The technical problem to be solved by the present invention is: how to conveniently, quickly, stably and reliably discharge the waste material embedded in the hole opener. The objective of this invention can be achieved through the following technical solutions: A hole opener includes an opening cylinder and a connecting rod; One end of the perforated cylinder is a cutting edge, and the other end is a connecting end; the connecting end of the perforated cylinder has a through hole that connects to the interior of the perforated cylinder. One end of the connecting rod is used to connect to the electric drill, and the other end of the connecting rod is inserted into the through hole and forms a circumferential limiting and axial sliding connection with the opening cylinder; The perforated cylinder is also provided with a limiting component for restricting the axial movement of the connecting rod within the through hole. The principle is as follows: The hole drill of this application is used to drill holes in various materials (such as wood, metal, plastic, ceramic tile, glass, concrete, etc.). In use, one end of the connecting rod is assembled onto the hole-drilling cylinder, and a limiting component is used to limit and fix it, thereby ensuring a stable connection between the connecting rod and the hole-drilling cylinder; the other end of the connecting rod is assembled and connected to an electric drill; the driving force of the electric drill drives the connecting rod and the hole-drilling cylinder to rotate, completing the cutting and drilling operation. During operation, the cut waste material will be embedded inside the hole-drilling cylinder. When cleaning is required, simply loosen the limiting component and move the connecting rod axially to easily and quickly push the waste material out of the hole-drilling cylinder; then restore the position of the connecting rod. By adopting the above technical solution, it is possible to conveniently, quickly, stably and reliably discharge the waste material embedded in the hole opener. Even tightly embedded waste material can be easily ejected without affecting the normal use of the hole opener. In addition, the connecting rod can also play a role in limiting and positioning, thereby accurately and reliably controlling the drilling depth. The connecting rod can also be easily and quickly replaced. According to the needs of the on-site use environment, different lengths of connecting rods can be replaced, which facilitates operation in narrow spaces and has a wider range of applications. In the aforementioned hole opener, a mounting base is fixedly provided at the connecting end of the hole-opening cylinder; The mounting base is integrally formed with the perforated cylinder; or the mounting base is welded and fixed to the perforated cylinder; or one end of the mounting base has a connecting screw, and the connecting end of the perforated cylinder has a connecting screw hole; the connecting screw is threaded into the connecting screw hole of the perforated cylinder. The limiting component is disposed on the mounting base. By adopting the above technical solution, it is easy to install the limiting component and the connecting rod, and the coaxiality of the connecting rod and the perforated cylinder is ensured, thereby ensuring that the connecting rod drives the perforated cylinder to rotate stably and reliably. In the above-mentioned hole opener, the mounting base is cylindrical and the mounting base is coaxially arranged with the hole opening cylinder; The connecting end of the perforated cylinder has a connecting post, the connecting post is coaxially arranged with the perforated cylinder, the connecting screw hole is located inside the connecting post and the connecting screw hole passes through the connecting post along the central axis of the connecting post; The outer peripheral surface of the connecting column is a regular polygon, or a clamping plane is provided on the outer peripheral surface of the connecting column; The through hole extends into the connecting screw and into the base of the mounting seat. By adopting the above technical solution, the mounting base can be easily and quickly and securely connected to the perforated cylinder. In the aforementioned hole opener, the outer circumferential surface of the connecting rod has a first limiting plane along its axial direction; the inner wall of the through hole has a second limiting plane that cooperates with the first limiting plane and forms a circumferential limiting plane. The outer circumferential surface of the connecting rod also has an annular groove that can form an axial limiting fit with the limiting component. By adopting the above technical solution, it is possible to conveniently and quickly achieve circumferential limiting and fixing of the connecting rod and the perforated cylinder, as well as axial limiting of the connecting rod by the limiting component, thereby ensuring the stability and reliability of the connecting rod. In the aforementioned hole opener, the connecting rod is a hexagonal bar, and the cross-section of the through hole is a regular hexagon. By adopting the above technical solution, the circumferential limiting and fixing of the connecting rod and the perforated cylinder can be achieved, which is low in price and has good stability. In the aforementioned hole opener, the number of the annular grooves is at least two, and all the annular grooves are spaced apart along the length direction of the connecting rod. By adopting the above technical solution, the annular grooves at different positions on the connecting rod can be selected to cooperate with the limiting components as needed, thereby adjusting the depth of the connecting rod extending into the perforated cylinder and precisely adjusting and controlling the drilling depth. In the aforementioned hole opener, a first mounting hole is provided on the outer peripheral surface of the mounting base along its radial direction, and a second mounting hole is provided inside the mounting base along its central axis; The limiting component is disposed at the first mounting hole of the mounting base; the second mounting hole and the through hole are coaxially arranged and connected to each other, and one end of the connecting rod passes through the second mounting hole and the through hole and extends into the perforated cylinder. By adopting the above technical solution, the limiting component is installed in the first mounting hole of the mounting base, which facilitates manual operation of the limiting component and can also stably and reliably achieve axial limiting of the connecting rod by the limiting component. In the aforementioned hole punch, a notch is formed on the outer peripheral surface of the mounting base, and the first mounting hole extends from the bottom of the notch to the second mounting hole; the limiting component is partially located within the notch. By adopting the above technical solution, the limiting component will not interfere with the rotation of the mounting base and the perforated cylinder, will not touch the components in the surrounding environment, will not cause damage to its own components, and is also easy to operate. In the aforementioned hole opener, the limiting assembly includes a limiting rod, a fixing cylinder, and an adjusting plate; the fixing cylinder is fixedly disposed in the first mounting hole of the mounting base; the adjusting plate is located in the notch groove, and one end of the limiting rod is fixedly connected to the adjusting plate; The limiting rod slides through the fixed cylinder along the axis of the fixed cylinder; The other end of the limiting rod has a limiting plate; a spring is sleeved on the limiting rod and the two ends of the spring act on the end face of the fixed cylinder and the side of the limiting plate, respectively. The limiting plate has a limiting block on the side away from the fixed cylinder, and the limiting block can be embedded in the annular groove of the connecting rod. By adopting the above technical solution, during installation and use, the annular groove on the connecting rod is aligned with the first mounting hole, the adjusting plate is located outside the first mounting hole, and the end of the limiting rod with the limiting plate passes through the first mounting hole and extends into the second mounting hole. The limiting block on the side of the limiting plate can be embedded in the annular groove on the connecting rod, thereby forming an axial limit on the connecting rod. Furthermore, the spring force causes the limiting block on the limiting plate to press against the bottom of the annular groove on the connecting rod. Combined with the circumferential limit of the connecting rod in the second mounting hole, the connecting rod is finally fixed, forming a stable and reliable connection. When it is necessary to disassemble or adjust the position of the connecting rod, use external force to pull the adjusting plate outward. The adjusting plate drives the limiting rod to move axially within the fixed cylinder against the spring force, thereby causing the limiting block on the limiting plate to disengage from the annular groove on the connecting rod. This allows the connecting rod to be easily moved axially to be pulled out or its position adjusted. After the connecting rod is adjusted to the correct position, release the adjusting plate. The limiting rod will return to its original position under the spring force, causing the limiting block on the limiting plate to re-enter the annular groove on the connecting rod, thus limiting the position of the connecting rod. The above structure is simple and convenient to operate, can be operated with one hand, and has a stable and reliable connection. In the above-mentioned hole opener, the end of the connecting rod that extends into the hole opening cylinder is provided with a positioning center, and the positioning center is integrally formed with the connecting rod or the two can be detachably fixed together. Alternatively, the end of the connecting rod that extends into the perforated cylinder may be provided with a reaming head; the reaming head is cylindrical; the outer diameter of the reaming head is at least twice the body diameter of the connecting rod, and the reaming head is detachably and fixedly connected to the connecting rod. Alternatively, a drill bit may be provided at the end of the connecting rod that extends into the perforated cylinder; the drill bit and the connecting rod may be detachably and fixedly connected together. Alternatively, a drill bit may be provided at the end of the connecting rod that extends into the perforated cylinder; the drill bit is axially slidably connected to the end of the connecting rod, and a second compression elastic element is provided between the drill bit and the connecting rod. By adopting the above technical solution, the positioning tip can play a preliminary positioning role when drilling holes in materials such as tiles that are prone to slipping. After adjusting the installation position of the connecting rod, the positioning tip on the connecting rod can be used to facilitate accurate and reliable drilling operations. Compared with the prior art, the aperture holder of the present invention has the following advantages: 1. In this application, the axially movable connecting rod can conveniently, quickly, stably and reliably discharge the waste material embedded in the hole opener. Even tightly embedded waste material can be easily ejected without affecting the normal use of the hole opener. 2. In this application, the connecting rod also serves as a limiting and positioning element. Multiple annular grooves are provided on the connecting rod, allowing for selection of different annular groove positions on the connecting rod to engage with the limiting component, thereby adjusting the depth of the connecting rod extending into the perforated cylinder and precisely adjusting and controlling the drilling depth. 3. The connecting rod in this application can be easily and quickly replaced. Different lengths and specifications of connecting rods can be replaced according to the needs of the on-site environment, which facilitates operation in narrow spaces and has a wider range of applications. 4. The connecting rod in this application is equipped with a positioning tip, which can play a preliminary positioning role when drilling holes in materials such as tiles that are prone to slipping, so as to facilitate accurate and reliable drilling operations. 5. In this application, when disassembling or adjusting the position of the connecting rod, the adjusting plate is pulled outward, the limiting block disengages from the annular groove, and the connecting rod can be easily moved axially. The operation is simple and convenient, and can be operated with one hand, which improves the convenience of disassembling or adjusting the connecting rod. Attached Figure Description

[0004] Figure 1 This is a schematic diagram showing the usage state of the hole punch in this application. Figure 2 This is a three-dimensional structural diagram of the connecting rod in Embodiment 1 of this application. Figure 3 This is a three-dimensional structural diagram of the hole opener in Embodiment 1 of this application. Figure 4 This is a three-dimensional structural diagram of the limiting component in Embodiment 1 of this application. Figure 5 This is an exploded structural diagram of the limiting component in Embodiment 1 of this application. Figure 6 This is a three-dimensional structural diagram of the connecting rod in Embodiment 2 of this application. Figure 7 This is a three-dimensional structural diagram of the connecting rod in Embodiment 3 of this application. Figure 8 This is a three-dimensional structural diagram of the connecting rod in Embodiment 4 of this application. Figure 9 This is a three-dimensional structural diagram of the connecting rod in Embodiment 5 of this application. Figure 10 This is a three-dimensional structural diagram of the connecting rod in Embodiment 6 of this application. Figure 11 This is a three-dimensional structural diagram of the limiting component in Embodiment 7 of this application. In the picture: 10. Perforated cylinder; 11. Cutting edge end; 12. Connecting end; 13. Through hole; 14. Connecting post; 141. Connecting screw hole; 142. Clamping plane; 20. Connecting rod; 21. Annular groove; 22. Positioning center; 23. Bearing; 24. First compression elastic element; 25. Reamer head; 251. Connecting shaft; 26. Drill bit; 27. Second compression elastic element; 28. Connecting hole; 29. ​​Screw hole; 30. Mounting base; 31. Connecting screw; 32. First mounting hole; 33. Second mounting hole; 34. Notch; 40. Limiting component; 41. Limiting rod; 411. Threaded section; 42. Limiting disc; 421. Limiting block; 43. Fixing cylinder; 431. Through hole; 432. External thread; 433. Strip groove; 434. Strip block; 44. Adjusting disc; 441. Threaded hole; 442. Connecting block; 4421. Arc surface; 4422. Limiting flat surface; 45. Spring; 46. Inner cylinder; 461. Mounting hole; 47. Outer cylinder; 48. Steel ball; 49. Third compression elastic element; 50. Electric drill; 60. Locking screws. Detailed Implementation

[0005] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1 Reference Figure 1 and Figure 2 As shown, the hole opener provided in this application embodiment includes a hole-opening cylinder 10, a connecting rod 20, and a limiting component 40. One end of the connecting rod 20 is used to connect to an electric drill 50, and the other end is inserted into the through hole 13 of the connecting end 12 of the hole-opening cylinder 10, forming a circumferential limiting and axial sliding connection with the hole-opening cylinder 10. The limiting component 40 is directly or indirectly disposed on the hole-opening cylinder 10 to limit the axial movement of the connecting rod 20 in the through hole 13, thereby achieving the effect of conveniently, quickly, stably, and reliably discharging the waste material embedded in the hole opener. This is because by limiting the connecting rod 20 with the limiting component 40, the connecting rod 20 can be stably connected to the hole-opening cylinder 10 for hole-opening operations. When cleaning the waste material, the limiting component 40 is released, and the axial movement of the connecting rod 20 can push the waste material out. Specifically, refer to Figure 1 and Figure 2As shown, one end of the perforated cylinder 10 is a cutting edge 11, and the other end is a connecting end 12. The cutting edge 11 is relatively sharp and can be made of wear-resistant materials, such as cemented carbide, enabling cutting and drilling operations on various materials such as wood, metal, plastic, ceramic tile, glass, and concrete. The connecting end 12 has a through hole 13 that connects to the interior of the perforated cylinder 10. The outer circumferential surface of the connecting rod 20 has a first limiting plane along its axial direction, and the inner wall of the through hole 13 has a second limiting plane. The first limiting plane on the connecting rod 20 and the second limiting plane on the inner wall of the through hole 13 cooperate to achieve circumferential limiting of the connecting rod 20 and the perforated cylinder 10. As a preferred option, the connecting rod 20 can be a hexagonal bar, in which case the cross-section of the through hole 13 is a regular hexagon. This structure not only achieves circumferential limiting but also has low cost and good stability. Reference Figure 1 and Figure 3 As shown, in this application, the connecting end 12 of the perforated cylinder 10 is fixedly provided with a mounting base 30 for passing through the connecting rod 20 and installing the limiting component 40. There are several ways to connect the mounting base 30 and the perforated cylinder 10. It can be integrally formed, which ensures the integrity and stability of the mounting base 30 and the perforated cylinder 10; it can also be welded together, which ensures a firm connection; or one end of the mounting base 30 can have a connecting screw 31, and the connecting end 12 of the perforated cylinder 10 has a connecting screw hole 141, with the connecting screw 31 threaded into the connecting screw hole 141, which facilitates installation and disassembly. In this application, the mounting base 30 is cylindrical and coaxially arranged with the perforated cylinder 10. The connecting end 12 of the perforated cylinder 10 has a connecting post 14, which is coaxially arranged with the perforated cylinder 10. The connecting screw hole 141 is located inside the connecting post 14 and passes through the connecting post 14 along its central axis. The outer circumferential surface of the connecting post 14 is a regular polygon, such as a regular hexagon, or a clamping plane 142 is provided on the outer circumferential surface of the connecting post 14 to facilitate clamping operations using tools. The through hole 13 extends into the connecting screw 31 and into the seat body of the mounting base 30. A first mounting hole 32 is provided on the outer circumferential surface of the mounting base 30 along its radial direction. The mounting base 30 has a second mounting hole 33 along its central axis, which is coaxially arranged with the through hole 13 and the two are connected. The second mounting hole 33 can also be a hole with a regular hexagonal cross-section, forming the same hole as the through hole 13. A notch 34 is also provided on the outer peripheral surface of the mounting base 30, and the first mounting hole 32 extends from the bottom of the notch 34 into the second mounting hole 33. Reference Figure 2As shown, in this embodiment, both ends of the connecting rod 20 are blunt surfaces. The outer circumferential surface of the connecting rod 20 has annular grooves 21 that can form an axial limiting fit with the limiting component 40. The number of annular grooves 21 is at least two, and all annular grooves 21 are spaced apart along the length direction of the connecting rod 20. This allows for the selection of different positions of the annular grooves 21 to fit with the limiting component 40 as needed, thereby precisely adjusting and controlling the drilling depth. One end of the connecting rod 20 passes through the second mounting hole 33 and the through hole 13 and extends into the perforated cylinder 10, while the other end is used to connect to the electric drill 50. Specifically, refer to Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment, the limiting component 40 includes a limiting rod 41, a fixed cylinder 43, and an adjusting plate 44. The fixed cylinder 43 is fixedly installed in the first mounting hole 32 of the mounting base 30, and the adjusting plate 44 is located in the notch 34. One end of the limiting rod 41 is fixedly connected to the adjusting plate 44. The limiting rod 41 and the adjusting plate 44 can be connected by threads. This connection method is convenient and efficient to assemble, and the connection is stable. The limiting rod 41 slides through the fixed cylinder 43 along the axis of the fixed cylinder 43. The other end of the limiting rod 41 has a limiting plate 42. A spring 45 is sleeved on the limiting rod 41, and the two ends of the spring 45 act on the end face of the fixed cylinder 43 and the side face of the limiting plate 42, respectively. The side face of the limiting plate 42 away from the fixed cylinder 43 has a limiting block 421, and the limiting block 421 can be embedded in the annular groove 21 of the connecting rod 20. During installation and use, the annular groove 21 on the connecting rod 20 is aligned with the first mounting hole 32, the adjusting plate 44 is located outside the first mounting hole 32, and the end of the limiting rod 41 with the limiting plate 42 passes through the first mounting hole 32 and extends into the second mounting hole 33. The limiting block 421 on the side of the limiting plate 42 can be embedded into the annular groove 21 on the connecting rod 20. The elastic force of the spring 45 causes the limiting block 421 on the limiting plate 42 to press against the bottom of the annular groove 21 on the connecting rod 20. In addition, the connecting rod 20 is circumferentially limited in the second mounting hole 33, thus fixing the connecting rod 20 and forming a stable and reliable connection. When it is necessary to disassemble or adjust the position of the connecting rod 20, an external force is used to pull the adjusting plate 44 outward. The adjusting plate 44 drives the limiting rod 41 to move axially within the fixed cylinder 43 against the elastic force of the spring 45. This causes the limiting block 421 on the limiting plate 42 to disengage from the annular groove 21 on the connecting rod 20, thus allowing the connecting rod 20 to be easily moved axially to be pulled out or its position adjusted. After the connecting rod 20 is adjusted to the correct position, the adjusting plate 44 is released, and the limiting rod 41 returns to its original position under the elastic force of the spring 45. This causes the limiting block 421 on the limiting plate 42 to re-enter the annular groove 21 on the connecting rod 20, thus limiting the position of the connecting rod 20. Furthermore, refer to Figure 4 and Figure 5As shown, in this embodiment, the rod body of the limiting rod 41 is a round rod, generally made of metal, such as stainless steel, which has good strength and wear resistance; of course, high-strength aluminum alloy can also be used to reduce weight. The surface of the rod body is smoothed to reduce friction with the fixed cylinder 43, facilitating its sliding within the fixed cylinder 43. One end of the rod body is integrally formed with the limiting plate 42. This integral structure makes the connection more stable and can better transmit force. The adjusting plate 44 has a through threaded hole 441 in the middle, and one end of the rod body of the limiting rod 41 has a threaded section 411. The threaded section 411 is located at the end of the limiting rod 41 away from the limiting plate 42, and is used to form a threaded connection with the adjusting plate 44. The thread precision of the threaded section 411 is high to ensure a tight fit with the threaded hole 441 of the adjusting plate 44 and prevent loosening. The adjusting disc 44 can be connected to the threaded section 411 in different ways. For example, a fine-pitch thread can be used for a tighter connection; thread-locking adhesive can also be applied to the threads to further enhance the stability of the connection. The fixed cylinder 43 is a hollow cylinder, usually made of metal such as carbon steel or stainless steel, with sufficient strength to support the limiting rod 41 and withstand external forces. The outer circumferential surface of the fixed cylinder 43 has external threads 432 for mating with the internal threads in the first mounting hole 32; the middle part of the fixed cylinder 43 has through holes 431 along its central axis, penetrating both ends of the fixed cylinder 43. The inner diameter of the through hole 431 is larger than the outer diameter of the limiting rod 41, allowing the limiting rod 41 to slide through the through hole 431. The inner wall of the cylinder is polished to ensure that the limiting rod 41 can slide smoothly within it. The through hole 431 provides sufficient space for the sliding of the limiting rod 41. The smooth inner wall of the through hole 431 reduces the friction between the limiting rod 41 and the through hole 431, improving the smoothness of operation. Reference Figure 4 and Figure 5As shown, a strip-shaped groove 433 is provided at the end of the fixed cylinder 43 away from the limiting plate 42. Both ends of the strip-shaped groove 433 penetrate the outer circumferential surface of the fixed cylinder 43. Specifically, two parallel, spaced strip-shaped blocks 434 are provided on the end face of the fixed cylinder 43 away from the limiting plate 42. The two strip-shaped blocks 434 are integrally formed with the fixed cylinder 43, and the strip-shaped groove 433 is formed between the two blocks 434. This strip-shaped groove 433 can be formed by milling. The outer contour of the adjusting plate 44 is a regular hexagon, a shape that facilitates rotation using tools, such as a wrench. The material of the plate body can be the same as that of the limiting rod 41, or it can be made of plastic to reduce cost and weight. The threaded hole 441 of the adjusting plate 44 is located at the center of the plate body and is used for threaded connection with the threaded section 411 of the limiting rod 41. The thread of the threaded hole 441 matches the threaded section 411 of the limiting rod 41, ensuring reliable connection. A connecting block 442 is fixedly mounted on the center of the side of the adjusting disc 44 facing the fixed cylinder 43; a threaded hole 441 also passes through the connecting block 442; the two ends of the connecting block 442 are arc surfaces 4421, and the two sides are limiting flat surfaces 4422. The size of the connecting block 442 is adapted to the strip groove 433 of the fixed cylinder 43 to ensure that the connecting block 442 can be tightly embedded therein. When the connecting block 442 is embedded in the strip groove 433, the rotation of the adjusting disc 44 can drive the fixed cylinder 43 to rotate. The design of the connecting block 442 creates a circumferential limit between the adjusting disc 44 and the fixed cylinder 43, facilitating the installation and removal of the fixed cylinder 43. Reference Figure 4 and Figure 5 As shown, in this embodiment, the limiting disc 42 is a disc, integrally formed with the limiting rod 41, and made of the same material as the limiting rod 41. The side of the limiting disc 42 contacts one end of the spring 45, providing support and force transmission for the spring 45. The diameter of the limiting disc 42 is larger than that of the limiting rod 41, generally several times larger, to ensure that the spring 45 can be stably fitted onto the limiting rod 41. The limiting block 421 is a cube, located on the side of the limiting disc 42 away from the fixed cylinder 43, and integrally formed with the limiting disc 42. The function of the limiting block 421 is to cooperate with the annular groove 21 on the connecting rod 20 of the hole opener to achieve axial limiting of the connecting rod 20. The size of the limiting block 421 is designed according to the size of the annular groove 21 to ensure that it can be tightly embedded therein. In this embodiment, the spring 45 is a compression spring 45, generally made of stainless steel or carbon steel, with a suitable elastic coefficient. Spring 45 is fitted onto limiting rod 41, with its two ends acting on the end face of fixed cylinder 43 and the side of limiting plate 42, respectively. The function of spring 45 is to provide elastic force so that the limiting block 421 on limiting plate 42 is always pressed against the annular groove 21 of connecting rod 20, ensuring the reliability of the limiting. The implementation principle of this embodiment is as follows: When using the hole opener, the connecting rod 20 is securely connected to the opening cylinder 10 via the limiting component 40. The connecting rod 20 is then connected to the electric drill 50, which drives the connecting rod 20 and the opening cylinder 10 to rotate, completing the cutting and drilling operation. The cut waste material is embedded inside the opening cylinder 10. During cleaning, the limiting component 40 is released, and the connecting rod 20 is moved axially to push the waste material out, making the operation convenient and quick. The connecting rod 20 also serves as a limiting and positioning element, controlling the drilling depth, and different lengths of connecting rod 20 can be replaced as needed. The limiting component 40, through the cooperation of the spring 45 and the limiting block 421 with the annular groove 21, achieves stable limiting of the connecting rod 20, ensuring connection stability during normal operation and facilitating waste removal. This hole opener solves the problems of inconvenient waste removal and unstable results of existing hole openers, improving ease of use and stability, and making a significant improvement and contribution to existing technology. Example 2 Reference Figure 6 As shown, this embodiment is largely the same as embodiment 1, except that in this embodiment, the end of the connecting rod 20 that extends into the perforated cylinder 10 is also provided with a positioning tip 22. The positioning tip 22 is integrally formed with the connecting rod 20. The positioning tip 22 rotates with the connecting rod 20. The positioning tip 22 can play a preliminary positioning role when drilling holes in materials such as ceramic tiles that are easy to slip, so as to facilitate accurate and reliable drilling operations. The positioning tip 22 can also be separately fixed to the connecting rod 20 by welding or screw connection. Example 3 Reference Figure 7 As shown, this embodiment is largely the same as Embodiment 2, except that in this embodiment, the positioning tip 22 and the connecting rod 20 are separately formed and rotatably connected by a bearing 23. A first compression elastic element 24, which can be a helical spring, is provided between the positioning tip 22 and the connecting rod 20. This first compression elastic element 24 provides initial positioning for the positioning tip 22 when drilling into easily slippery materials such as ceramic tiles, and prevents it from drilling into the waste material as the connecting rod 20 rotates, thus avoiding inconvenience when unloading the waste material. Simultaneously, the first compression elastic element 24 ensures the effective positioning of the positioning tip 22. Example 4 Reference Figure 8As shown, this embodiment is largely the same as Embodiment 2, except that in this embodiment, the end of the connecting rod 20 that extends into the perforated cylinder 10 is also provided with a reaming head 25; the reaming head 25 is cylindrical; the outer diameter of the reaming head 25 is at least twice the body diameter of the connecting rod 20, for example, the outer diameter of the reaming head 25 can be two, three, or four times the body diameter of the connecting rod 20. The reaming head 25 is detachably fixed to the connecting rod 20, and different sizes of the reaming head 25 can be flexibly changed according to the size of the original positioning hole, solving the problem of positioning failure during reaming. Furthermore, the end of the connecting rod 20 is provided with a connecting hole 28, and the end of the reaming head 25 near the connecting rod 20 is provided with a connecting shaft 251, which is inserted into the connecting hole 28; the outer circumferential surface of the connecting rod 20 is provided with a screw hole 29 that communicates with the connecting hole 28, and a locking screw 60 is screwed into the screw hole 29; by tightening the connecting shaft 251 with the locking screw 60, the reaming head 25 can be fixedly connected to the connecting rod 20. In this application, a large-diameter reaming head 25 is provided, and the other end of the reaming head 25 has a flat end face with a large area. When the hole opener in this application performs large-diameter drilling and drilling of soft materials, the force-bearing surface is increased by the reaming head 25, which can ensure that soft materials and large-diameter waste are stably and reliably discharged, and avoid the small-diameter connecting rod 20 directly passing through the waste, thus solving the problem that the force-bearing surface of waste is too small and difficult to discharge in some special scenarios. Example 5 Reference Figure 9 As shown, this embodiment is largely the same as embodiment 2, except that in this embodiment, the end of the connecting rod 20 that extends into the perforated cylinder 10 is also provided with a drill bit 26; the drill bit 26 and the connecting rod 20 are detachably fixed together. Specifically, the end of the connecting rod 20 is provided with a connecting hole 28, which is arranged along the axial direction of the connecting rod 20. The connecting hole 28 can be a blind hole. The end of the drill bit 26 near the connecting rod 20 is slidably inserted into the connecting hole 28. The cross-section of the connecting hole 28 can be set as a regular hexagon, and the drill rod of the drill bit 26 is also a regular hexagon, and the two match to form a circumferential limit; a second compression elastic element 27 is provided in the connecting hole 28. The first compression elastic element 27 can be a helical spring. The two ends of the second compression elastic element 27 act on the end of the drill bit 26 and the bottom of the connecting hole 28, respectively. When the force is large, the drill bit 26 can squeeze the first compression elastic element 27 and contract into the connecting hole 28 of the connecting rod 20. Example 6 Reference Figure 10As shown, this embodiment is largely the same as embodiment 2, except that in this embodiment, a drill bit 26 is also provided at the end of the connecting rod 20 that extends into the perforated cylinder 10; the drill bit 26 and the connecting rod 20 are detachably and fixedly connected together. Specifically, a connecting hole 28 is provided at the end of the connecting rod 20, and the drill rod of the drill bit 26 is inserted into the connecting hole 28; a screw hole 29 communicating with the connecting hole 28 is provided on the outer circumferential surface of the connecting rod 20, and a locking screw 60 is screwed into the screw hole 29; by tightening the drill rod of the drill bit 26 with the locking screw 60, the drill bit 26 can be fixedly connected to the connecting rod 20. The drill bit 26 can be used for preliminary positioning and for enlarging the positioning hole. Example 7 Reference Figure 11 As shown, this embodiment is largely the same as Embodiment 1, Embodiment 2, or Embodiment 3, except that the limiting component 40 provided on the mounting base 30 in this embodiment includes an inner cylinder 46 and an outer cylinder 47. One end of the inner cylinder 46 is fixed to the end of the mounting base 30, and a plurality of mounting holes 461 are provided on the outer circumferential surface of the other end of the inner cylinder 46. The plurality of mounting holes 461 are arranged in a circle around the circumference of the inner cylinder 46, and a steel ball 48 is provided in each mounting hole 461. The diameter of the mounting hole 461 is smaller than the diameter of the steel ball 48, and most of the steel ball 48 is located on the outside of the inner cylinder 46. The outer cylinder 47 is sleeved on the inner cylinder 46, and a third compression elastic member 49 is provided between the inner wall of the outer cylinder 47 and the inner cylinder 46. The third compression elastic member 49 can be a helical spring. The two ends of the third compression elastic member 49 act on the outer cylinder 47 and the inner cylinder 46 respectively to push. The outer cylinder 47 moves axially. Steps can be provided on the inner wall of the outer cylinder 47 and the outer circumferential surface of the inner cylinder 46 for the end of the third compression elastic member 49 to abut. An inclined guide portion is also provided on the inner wall of the outer cylinder 47. When the outer cylinder 47 moves axially, the guide portion pushes the steel ball 48 to move into the inner cylinder 46. The connecting rod 20 passes through the inner cylinder 46 axially, and the annular groove 21 on the connecting rod 20 is aligned with the steel ball 48. The steel ball 48 partially enters the inner cylinder 46 and is embedded in the annular groove 21 of the connecting rod 20, thus axially limiting the connecting rod 20. When it is necessary to move the connecting rod 20, the external force overcomes the elastic force of the third compression elastic member 49 and pushes the outer cylinder 47 to move axially in the opposite direction. At this time, pushing the connecting rod 20 to move axially will squeeze and push the steel ball 48 to move out of the inner cylinder 46, releasing the limitation. This structure is relatively simple to operate, and the limitation and positioning are reliable. The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A hole opener, comprising an opening cylinder (10) and a connecting rod (20); one end of the opening cylinder (10) is a cutting edge end (11), and the other end is a connecting end (12); Its features are, The connecting end (12) of the perforated cylinder (10) is provided with a through hole (13) that communicates with the interior of the perforated cylinder (10); One end of the connecting rod (20) is used to connect with the electric drill (50), and the other end of the connecting rod (20) is inserted into the through hole (13) and forms a circumferential limiting and axial sliding connection with the perforated cylinder (10); The perforated cylinder (10) is also provided with a limiting component (40) for restricting the axial movement of the connecting rod (20) within the through hole (13).

2. The hole opener according to claim 1, characterized in that, The connecting end (12) of the perforated cylinder (10) is fixedly provided with a mounting base (30); The mounting base (30) is integrally formed with the perforated cylinder (10); or the mounting base (30) is welded and fixed to the perforated cylinder (10); or one end of the mounting base (30) has a connecting screw (31), and the connecting end (12) of the perforated cylinder (10) is provided with a connecting screw hole (141); the connecting screw (31) is threaded into the connecting screw hole (141) of the perforated cylinder (10); The limiting component (40) is disposed on the mounting base (30).

3. The hole opener according to claim 2, characterized in that, The mounting base (30) is cylindrical and is coaxially arranged with the perforated cylinder (10); The connecting end (12) of the perforated cylinder (10) has a connecting post (14), the connecting post (14) is coaxially arranged with the perforated cylinder (10), the connecting screw hole (141) is located inside the connecting post (14) and the connecting screw hole (141) passes through the connecting post (14) along the central axis of the connecting post (14); The outer periphery of the connecting post (14) is a regular polygon, or a clamping plane (142) is provided on the outer periphery of the connecting post (14); The through hole (13) extends into the connecting screw (31) and into the seat of the mounting base (30).

4. The hole opener according to claim 2 or 3, characterized in that, The outer circumferential surface of the connecting rod (20) has a first limiting plane along its axial direction; the inner wall of the through hole (13) has a second limiting plane that cooperates with the first limiting plane and forms a circumferential limiting plane. The outer circumferential surface of the connecting rod (20) also has an annular groove (21) that can form an axial limiting fit with the limiting component (40).

5. The hole opener according to claim 4, characterized in that, The connecting rod (20) is a hexagonal bar, and the cross-section of the through hole (13) is a regular hexagon.

6. The hole opener according to claim 4, characterized in that, The number of the annular grooves (21) is at least two and all the annular grooves (21) are spaced apart along the length direction of the connecting rod (20).

7. The hole opener according to claim 3, characterized in that, The mounting base (30) has a first mounting hole (32) along its radial direction on its outer peripheral surface, and the mounting base (30) has a second mounting hole (33) along its central axis. The limiting component (40) is disposed at the first mounting hole (32) of the mounting base (30); the second mounting hole (33) is coaxially disposed with the through hole (13) and the two are connected and connected; one end of the connecting rod (20) passes through the second mounting hole (33) and the through hole (13) and extends into the perforated cylinder (10).

8. The hole opener according to claim 7, characterized in that, The mounting base (30) has a notch (34) on its outer peripheral surface, and the first mounting hole (32) extends from the bottom of the notch (34) into the second mounting hole (33); the limiting component (40) is partially located in the notch (34).

9. The hole opener according to claim 8, characterized in that, The limiting component (40) includes a limiting rod (41), a fixing cylinder (43), and an adjusting plate (44); the fixing cylinder (43) is fixed in the first mounting hole (32) of the mounting base (30); the adjusting plate (44) is located in the notch (34), and one end of the limiting rod (41) is fixedly connected to the adjusting plate (44); The limiting rod (41) slides through the fixed cylinder (43) along the axis of the fixed cylinder (43); The other end of the limiting rod (41) has a limiting plate (42); a spring (45) is sleeved on the limiting rod (41) and the two ends of the spring (45) act on the end face of the fixed cylinder (43) and the side face of the limiting plate (42) respectively; The limiting plate (42) has a limiting block (421) on the side away from the fixed cylinder (43), and the limiting block (421) can be embedded in the annular groove (21) of the connecting rod (20).

10. The hole opener according to claim 6, characterized in that, The end of the connecting rod (20) that extends into the perforated cylinder (10) is provided with a positioning tip (22), and the positioning tip (22) and the connecting rod (20) are integrally formed or detachably fixed together; Alternatively, the end of the connecting rod (20) that extends into the perforated cylinder (10) is provided with a reaming head (25); the reaming head (25) is cylindrical; the outer diameter of the reaming head (25) is at least twice the body diameter of the connecting rod (20), and the reaming head (25) is detachably fixed to the connecting rod (20); Alternatively, a drill bit (26) may be provided at the end of the connecting rod (20) that extends into the perforated cylinder (10); the drill bit (26) and the connecting rod (20) may be detachably and fixedly connected together. Alternatively, a drill bit (26) may be provided at the end of the connecting rod (20) that extends into the perforated cylinder (10); the drill bit (26) is axially slidably connected to the end of the connecting rod (20), and a second compression elastic element (27) is provided between the drill bit (26) and the connecting rod (20).

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