Drill bit connecting structure with self-locking function

Abstract

The drill bit connecting structure with the self-locking function comprises a drill bit and a sleeve, a taper handle is arranged at the rear end of the drill bit, a mounting hole is formed in the bottom face of the sleeve in the axial direction of the sleeve, a locking structure is arranged between the mounting hole and the taper handle, and when the taper handle is inserted into the mounting hole, the locking structure limits axial movement of the taper handle. The technical problems that in an existing drill bit connecting structure, operation is complex, assembling is difficult, and locking fails under vibration are solved.

Description

Technical Field

[0001] The invention relates to a drill bit connection structure with a self-locking function. Background Art

[0002] In the fields of mechanical processing, mining drilling, construction, etc., the drill bit is a frequently replaced working part, and the connection method between it and the drive system (such as electric drill, electric hammer, etc.) is directly related to the work efficiency and construction safety. The drill bit connection structure currently widely used is mostly equipped with a self-locking device, which intends to achieve a stable connection between the drill bit and the drive shaft through structural design without the need for additional fasteners. However, the existing self-locking structure generally has the problems of inconvenience in use and complicated operation.

[0003] For example, some traditional self-locking mechanisms rely on wedge-shaped fits, elastic clips, pins and other components to achieve the self-locking function. Although these structures have the ability to automatically lock in theory, they face the following difficulties in actual operation: On the one hand, the self-locking action process is often limited by the insertion force and structural tolerance, which makes assembly difficult and requires greater force or even the use of tools to complete; on the other hand, the disassembly process is also complicated, and some structures even require the release of self-locking elements at a specific angle or sequence, which makes it difficult for operators to quickly master, greatly reducing work efficiency.

[0004] In addition, some self-locking structures have the risk of failure when subjected to continuous high-frequency vibration, making it difficult to ensure long-term reliability. In addition, the assembly process lacks clear status indications, making it difficult for users to determine whether effective locking has been completed. Due to these problems, the current market urgently needs a drill bit connection structure that combines self-locking reliability with ease of operation to adapt to the high-intensity, fast-paced on-site construction environment. Summary of the invention

[0005] The purpose of the present invention is to solve the above deficiencies in the prior art and provide a drill bit connection structure with a self-locking function.

[0006] A drill bit connection structure with a self-locking function comprises a drill bit and a sleeve. The rear end of the drill bit is provided with a tapered shank, the bottom surface of the sleeve is provided with a mounting hole along its axial direction, and a locking structure is provided between the mounting hole and the tapered shank. When the tapered shank is inserted into the mounting hole, the locking structure limits the axial movement of the tapered shank.

[0007] Furthermore, the locking structure includes a locking bevel and a locking piece. The locking bevel is arranged on the outer side surface of the tapered handle. The locking bevel extends from the end away from the drill bit to the end close to the drill bit, and is inclined from high to low. The outer side surface of the sleeve is provided with a locking hole along its radial direction. A movable locking piece with a locking structure is provided in the locking hole. When the tapered handle is inserted into the mounting hole, the locking bevel is located directly below the locking hole, and the locking piece presses against the locking bevel to prevent the tapered handle from moving axially.

[0008] Further, the locking member is a screw, and the inner wall of the mounting hole is provided with a thread.

[0009] Further, the locking member includes a movable rod, a baffle is arranged on the outer side of the middle section of the movable rod, opposite grooves are arranged in the middle section of the inner side wall of the mounting hole, positioning columns arranged along the axial direction of the mounting hole are arranged in the grooves, the baffle movably penetrates through the positioning columns, corresponding pin holes are arranged on the outer side surface of the part of the movable rod above the baffle and on the outer side surface of the sleeve, and when the two pin holes are aligned, a pin is inserted to lock.

[0010] Further, a return spring is sleeved on the positioning column, and the return spring is located between the lower end surface of the baffle and the bottom surface of the groove.

[0011] Further, the contact surface between the locking member and the inclined surface is a spherical surface.

[0012] Further, the outer side surface of the taper shank is a conical surface, and the conical surface extends obliquely from high to low from the end close to the drill bit to the end far from the drill bit.

[0013] Further, the connection between the drill bit and the taper shank is detachable, a connecting rod is arranged at the front end of the taper shank, and the connecting rod is inserted into the drill bit.

[0014] Further, relief notches are arranged at the ports at both ends of the pin hole on the outer side surface of the sleeve.

[0015] Advantageous effects: Compared with the prior art, the present invention has the following advantages:

[0016] The primary advantage of this drill bit connection structure lies in its superior structural stability and self-locking performance. By providing a taper shank at the rear end of the drill bit and forming a conical surface fit with the mounting hole in the sleeve, not only a natural positioning and guiding function is achieved, but also a preliminary self-locking structure is formed by means of the taper effect. In addition, a further provided locking structure, such as the cooperation between the locking inclined surface and the locking member, can effectively limit the axial movement of the taper shank after it is inserted into the mounting hole, ensuring that the drill bit is not easily loosened during operation, and greatly enhancing the impact resistance and overall stability of the connection.

[0017] Secondly, this structure is outstanding in terms of operation convenience. Whether it is a locking member realized in the form of a locking screw, a pin or a movable rod, it supports rapid assembly and disassembly. Users can replace the drill bit efficiently during on-site operation without special tools, significantly shortening the equipment downtime. Especially the detachable connection between the drill bit and the taper shank further reduces the consumable replacement cost, making equipment maintenance more flexible and efficient.

[0018] In terms of assembly accuracy, this structure also has obvious advantages. The conical surface mating structure naturally has the ability to control coaxiality, which can effectively reduce the yaw of the drill bit during rotation, thereby improving the drilling accuracy. Together with a series of guiding and limiting structures such as grooves, positioning posts, and baffles, the position consistency during the assembly process is ensured, enabling the accuracy to remain consistent even after multiple assemblies, especially suitable for high-precision application scenarios.

[0019] In addition, the drill bit connection structure adopts a modular design concept, with good adaptability and expandability. Each functional component is relatively independent and can be flexibly adjusted according to specific usage requirements. For example, different forms of locking parts can be replaced, and taper shanks with different angles can be configured to meet the operation requirements of different industries and different size specifications, improving the versatility and adaptability of the product.

[0020] Finally, from the perspective of safety, this structure fully considers the operating stability under high-strength working conditions. For example, the structural design of the reset spring cooperating with the baffle can achieve automatic reset after the locking part becomes loose or there is a misoperation, avoiding connection failure caused by operating errors. At the same time, the multi-stage locking structure provides redundant safety guarantees, ensuring that the system can still maintain stable operation under complex working conditions, improving the safety level and reliability of the overall equipment. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the taper shank inserted into the sleeve;

[0022] Figure 2 is a schematic diagram of the taper shank;

[0023] Figure 3 is a schematic diagram of the cooperation between the locking part and the locking inclined plane in the locking hole in the first embodiment;

[0024] Figure 4 is a schematic diagram of the sleeve in the second embodiment;

[0025] Figure 5 is a schematic diagram of the structure of the locking part in the locking hole in the second embodiment;

[0026] Figure 6 is a schematic diagram of the cooperation between the twist drill bit, the connecting rod, and the taper shank;

[0027] Figure 7 is a schematic diagram of the cooperation between the self-tapping drill bit and the connecting rod taper shank;

[0028] In the figure, 1. Drill bit, 2. Sleeve, 3. Taper shank, 4. Connecting rod, 5. Locking hole, 6. Locking inclined plane, 7. Screw, 8. Movable rod, 9. Relief notch, 10. Pin hole, 11. Baffle, 12. Positioning post, 13. Reset spring. Detailed Embodiments

[0029] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0030] Embodiment 1:

[0031] A drill bit connection structure with a self-locking function includes a drill bit 1 and a sleeve 2. A tapered shank 3 is provided at the rear end of the drill bit 1. An installation hole is provided along the axial direction on the bottom surface of the sleeve 2. A locking structure is provided between the installation hole and the tapered shank 3. When the tapered shank 3 is inserted into the installation hole, the locking structure restricts the axial movement of the tapered shank 3.

[0032] In this embodiment, by providing a tapered shank 3 at the rear end of the drill bit 1 and axially providing a matching installation hole on the bottom surface of the sleeve 2, the drill bit 1 can be inserted into the installation hole through the tapered shank 3. At the same time, a locking structure is provided between the tapered shank 3 and the installation hole. After the tapered shank 3 is inserted into the installation hole, the locking structure acts on the outer surface of the tapered shank 3 to generate axial restriction, preventing the drill bit 1 from falling off during the working process due to vibration or load. This structure realizes preliminary positioning through taper fit and further realizes the self-locking function through the locking structure, thereby ensuring the firmness and reliability of the connection.

[0033] The connection structure of the present invention has a self-locking function, which can realize quick installation and firm connection without the aid of external tools, and is particularly suitable for operation scenarios where the drill bit 1 needs to be frequently replaced. At the same time, the tapered shank 3 insertion structure improves the coaxiality of the connection, avoids the deflection of the drill bit 1 during rotation, and effectively improves the drilling accuracy; the setting of the locking structure provides an additional axial locking force to prevent loosening, thereby significantly improving the operation safety and system stability.

[0034] In a possible implementation manner, the locking structure includes a locking inclined surface 6 and a locking member. The locking inclined surface 6 is provided on the outer side surface of the tapered shank 3. The locking inclined surface 6 extends obliquely from high to low from the end far away from the drill bit 1 to the end close to the drill bit 1. A locking hole 5 is provided along the radial direction on the outer side surface of the sleeve 2. A movable locking member with a locking structure is provided in the locking hole 5. When the tapered shank 3 is inserted into the installation hole, the locking inclined surface 6 is located directly below the locking hole 5, and the locking member abuts against the locking inclined surface 6 to prevent the axial movement of the tapered shank 3.

[0035] In this implementation manner, by forming an inclined surface on the outer side of the tapered shank 3 and providing a locking hole 5 and a movable locking member on the outer side of the sleeve 2, after the tapered shank 3 is inserted into the sleeve 2, the locking member is in close contact with the inclined surface. The radial force of the locking member is converted into axial resistance by using the inclined surface structure, thereby realizing the axial limit of the tapered shank 3. The locking hole 5 allows the movement of the locking member and forms a locked state after the operation is completed, effectively preventing falling off.

[0036] By setting the inclined locking slope 6, when the locking member applies force radially, an axial reaction force is automatically generated, effectively enhancing the connection stability. At the same time, this structure can achieve high-strength locking without complex mechanical cooperation, simplifies the structural design and assembly process, and improves the assembly efficiency and reliability.

[0037] In a possible implementation, the locking member is a screw 7, and the inner wall of the mounting hole is provided with threads.

[0038] The locking member adopts the form of a screw 7. By screwing the screw 7 into the threads in the mounting hole and contacting the locking slope 6 on the taper shank 3, a stable locking force is formed. By tightening the screw 7, the pressure on the slope can be adjusted, thereby adjusting the magnitude of the locking force.

[0039] Using the screw 7 as the locking member has good adjustability and reusability, is easy to install, and has a low cost, making it suitable for a variety of industrial application scenarios.

[0040] In a possible implementation, the contact surface between the locking member and the slope is a spherical surface.

[0041] Designing the end of the locking member or the locking slope 6 as a spherical structure can achieve a larger contact area and more uniform contact pressure, reduce local stress concentration, and enhance the locking stability at the same time.

[0042] The spherical contact improves the fitting accuracy and load-bearing capacity, and at the same time enhances the anti-wear performance and extends the service life of the connecting components.

[0043] In a possible implementation, the outer side surface of the taper shank 3 is a conical surface, and the conical surface extends obliquely from high to low from the end close to the drill bit 1 to the end far from the drill bit 1.

[0044] The conical surface structure can be gradually guided during the insertion process, facilitating positioning, and at the same time achieving preliminary locking through the wedging effect. The taper design ensures that the greater the insertion depth, the stronger the locking force.

[0045] The structure of the taper shank 3 enhances the self-locking effect of the connection, improves the anti-pulling-out ability, and at the same time has a compact structure, facilitating manufacturing and processing.

[0046] In a possible implementation, the connection between the drill bit 1 and the taper shank 3 is a detachable connection. The front end of the taper shank 3 is provided with a connecting rod 4, and the connecting rod 4 is inserted into the drill bit 1.

[0047] The insertion connection between the drill bit 1 and the taper shank 3 is achieved through the connecting rod 4, enabling the drill bit 1 to be quickly replaced on the premise that the taper shank 3 remains unchanged. The connecting rod 4 provides mechanical cooperation strength and is easy to operate.

[0048] It should be noted that the type of the drill bit 1 is not limited, and it can be a twist drill bit, a self-tapping drill bit, or a tapered drill bit.

[0049] Embodiment 2:

[0050] In a possible embodiment, the locking member includes a movable rod 8, a baffle 11 is provided on the outer side of the middle section of the movable rod 8, a relative groove is provided on the middle section of the inner wall of the mounting hole, a positioning column 12 is provided in the groove along the axial direction of the mounting hole, the baffle 11 is movably passed through the positioning column 12, and a portion of the outer surface of the movable rod 8 above the baffle 11 and the outer surface of the sleeve 2 are provided with corresponding pin holes 10. When the two pin holes 10 are aligned and the latch is inserted to lock, the outer surface of the sleeve 2 is provided with a clearance notch 9 at the ports at both ends of the pin hole 10, and the clearance notch 9 facilitates the insertion of the latch.

[0051] The movable rod 8 and the baffle 11 form a set of mechanical limit and locking system. During the insertion process, the movable rod 8 drives the baffle 11 to slide along the positioning column 12, and the latch is inserted through the pin hole 10 to achieve final locking. This structure allows for quick insertion and removal, and the positioning column 12 and the groove are used to ensure installation alignment accuracy.

[0052] This structure has the advantages of quick locking, high positioning accuracy and easy assembly. It is especially suitable for use in situations where frequent disassembly and assembly are required, thus improving work efficiency.

[0053] In a possible implementation manner, a return spring 13 is sleeved on the positioning column 12 , and the return spring 13 is located between the lower end surface of the baffle 11 and the bottom surface of the groove.

[0054] The setting of the return spring 13 enables the baffle 11 to always maintain the initial position in the non-operating state. When the latch is pulled out, the spring provides a return force to restore the baffle 11.

[0055] It has an automatic reset function, which reduces manual intervention, improves operational convenience and reliability, and reduces the risk of installation errors caused by forgetting to reset.

[0056] The rest are the same as those in the first embodiment.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A drill bit connection structure with a self-locking function, characterized in that, It includes a drill bit and a sleeve. A taper shank is provided at the rear end of the drill bit. An installation hole is axially provided on the bottom surface of the sleeve. A locking structure is provided between the installation hole and the taper shank. When the taper shank is inserted into the installation hole, the locking structure restricts the axial movement of the taper shank.

2. The drill bit connection structure according to claim 1, characterized in that, The locking structure includes a locking inclined surface and a locking member. The locking inclined surface is provided on the outer side surface of the taper shank. The locking inclined surface extends obliquely from high to low from the end far away from the drill bit to the end close to the drill bit. A locking hole is radially provided on the outer side surface of the sleeve. A movable locking member with a locking structure is provided in the locking hole. After the taper shank is inserted into the installation hole, the locking inclined surface is located directly below the locking hole, and the locking member abuts against the locking inclined surface to prevent the axial movement of the taper shank.

3. The drill bit connection structure according to claim 2, characterized in that, The locking member is a screw, and the inner wall of the installation hole is provided with threads.

4. The drill bit connection structure according to claim 2, wherein, The locking member includes a movable rod. A baffle is provided on the outer side of the middle section of the movable rod. Opposite grooves are provided in the middle section of the inner side wall of the installation hole. A positioning post arranged along the axial direction of the installation hole is provided in the groove. The baffle movably penetrates through the positioning post. Corresponding pin holes are provided on the outer side surface of the part of the movable rod above the baffle and on the outer side surface of the sleeve. When the two pin holes are aligned, a cotter pin is inserted to lock.

5. The drill bit connection structure according to claim 4, characterized in that, A return spring is sleeved on the positioning post. The return spring is located between the lower end surface of the baffle and the bottom surface of the groove.

6. The drill bit connection structure according to claim 4, characterized in that Relief notches are provided at the ports at both ends of the pin hole on the outer side surface of the sleeve.

7. The drill bit connection structure according to claim 2 or 4, characterized in that, The contact surface between the locking member and the inclined surface is a spherical surface.

8. The drill bit connection structure according to claim 1, characterized in that, The outer side surface of the taper shank is a conical surface, which extends obliquely from high to low from the end close to the drill bit to the end far away from the drill bit.

9. The drill bit connection structure according to claim 1, characterized in that, The connection between the drill bit and the taper shank is detachable. A connecting rod is provided at the front end of the taper shank, and the connecting rod is inserted into the drill bit.

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