A knife handle nut

Abstract

This utility model relates to the field of machine tool accessories technology, and in particular to a tool holder nut, comprising a rear inner shell, a front outer cover, a dust cover, a bearing, and a retaining ring. The rear inner shell has a first internal thread on its bore wall and an external thread on its outer side wall. The front outer shell has a first mounting position, a retaining ring, a second mounting position, and a second internal thread that is screwed to the external thread in sequence on its bore wall. The bearing and the retaining ring are sequentially mounted at the second mounting position. The outer ring of the bearing is sandwiched between the retaining ring and the retaining ring, and the retaining ring is sandwiched between the outer ring of the bearing and the end face of the rear inner shell. The dust cover is mounted at the first mounting position and covers the bearing. The dust cover has a through hole, and the inner ring of the bearing has an abutting inclined surface. This application achieves modular assembly, making disassembly and maintenance convenient. During the locking or unlocking of the elastic chuck and the tool, the front outer cover and the rear inner shell will not slide against the outer conical surface of the elastic chuck, so that the elastic chuck will not be subjected to torque. It also has good dustproof effect, long service life, and low failure rate.

Description

Technical Field

[0001] This utility model relates to the field of machine tool accessories technology, and in particular to a tool holder nut. Background Technology

[0002] The nut in the tool holder system mainly works with the tool holder body to apply force to the elastic collet, so that the elastic collet is installed on the tool holder body and clamps the tool.

[0003] Among existing patents, Chinese patent document with application number 202120972136.4 discloses a dustproof nut for a knife handle, which includes a nut body with an internal thread that matches the knife handle; a wrench fixing groove on the outside of the nut body for applying force to disassemble the nut body; a through hole at the bottom of the nut body, an outer countersunk hole around the through hole, a buffer ring inside the outer countersunk hole, and a through hole at the center of the buffer ring, through which the device is fixed to the knife.

[0004] Furthermore, Chinese patent application number 202121585216.0 discloses a CNC tool holder mounting structure with a water-stop nut, including a tool holder body and a water-stop nut. The tool holder body has an axially penetrating hollow pipe formed inside. One end of the hollow pipe has a first conical surface that tapers from the outside to the inside, and a tool is mounted axially through an elastic collet. The outer wall of this end of the tool holder body has an external thread and is connected to the water-stop nut. The inner wall of the outer end of the water-stop nut has a first annular groove and a first rubber ring that seals against the outer wall of the tool. It also has a second conical surface that contacts the outer conical surface of the elastic collet. The inner wall of the middle section of the water-stop nut has an internal thread that corresponds to the external thread of the tool holder body. The inner end of the water-stop nut is a straight section, and a second annular groove is provided on the outer wall of the tool holder body, on the contact surface with the inner wall of the straight section, and a second rubber ring is installed.

[0005] While the nut structures disclosed in these two patent documents both have a certain dustproof effect, during the process of screwing the nut relative to the tool holder body to lock the elastic collet onto the tool holder body, the nut will slide and rub against the outer conical surface of the elastic collet. The nut and the elastic collet are prone to wear, which can easily lead to unstable locking of the nut onto the elastic collet. In addition, the elastic collet will be subjected to torque, and long-term use and frequent disassembly and assembly can easily cause deformation or damage to the elastic collet, shortening its service life.

[0006] Therefore, the defects are very obvious, and a solution is urgently needed. Utility Model Content

[0007] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a tool holder nut.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A tool holder nut includes a rear inner shell, a front outer cover, a dust cover, a bearing, and a retaining ring. The rear inner shell has a first internal thread on its bore wall and an external thread on its outer side wall. The front outer cover has a first mounting position, a retaining ring, a second mounting position, and a second internal thread sequentially arranged on its bore wall. The front outer cover is fitted over the rear inner shell, and the second internal thread is screwed into the external thread. The bearing and the retaining ring are sequentially mounted at the second mounting position. The outer ring of the bearing is sandwiched between the retaining ring and the retaining ring, and the retaining ring is sandwiched between the outer ring of the bearing and the end face of the rear inner shell. The dust cover is mounted at the first mounting position and covers the bearing. A through hole is provided at the center of the dust cover, and the inner ring bore wall of the bearing has an abutting bevel.

[0010] Furthermore, the tool holder nut also includes a Teflon ring, which is installed in the first mounting position and clamped between the bearing and the retaining ring, with the Teflon ring abutting against the inner end face of the bearing.

[0011] Furthermore, the tool holder nut also includes a dustproof inner ring, which is fitted into the through hole of the dust cover.

[0012] Furthermore, a first sealing ring is embedded in the wall of the through hole, and the first sealing ring is fitted onto the outer wall of the dustproof inner ring.

[0013] Furthermore, a second sealing ring is fitted into the bore wall of the dustproof inner ring.

[0014] Furthermore, a limiting ring is provided on the inner circumference of the dustproof inner ring, which is used to abut against the inner surface of the dustproof cover.

[0015] Furthermore, a third sealing ring is embedded in the inner side of the dust cover and / or the front end face of the front outer cover, the third sealing ring being sandwiched between the inner side of the dust cover and the front end face of the front outer cover.

[0016] Furthermore, the inner wall of the dust cover is provided with a mounting ring, which surrounds the edge of the through hole. At least two locking blocks are protruding from the periphery of the mounting ring. A spring ball is embedded in the mounting ring, and the spring ball can extend out of the periphery of the mounting ring. The inner wall of the first mounting position is provided with multiple locking positions in a circular array around the central axis of the front outer cover. The inner wall of the first mounting position is recessed with an annular groove. Multiple locking positions are located outside the annular groove and communicate with the annular groove. The locking blocks can rotate along the annular groove and be locked in the annular groove. The spring ball is used to engage with one of the locking positions. When all the locking blocks are aligned with a locking position, all the locking blocks can enter the annular groove or move out of the annular groove.

[0017] Furthermore, there are multiple spring beads, and each locking block is located between two spring beads. The sum of the number of spring beads and the number of locking blocks is no greater than the number of locking positions.

[0018] Furthermore, the outer side of the dust cover is provided with a screw groove.

[0019] The beneficial effects of this utility model are as follows: In practical applications, when it is necessary to lock the elastic collet onto the tool holder body, first insert one end of the elastic collet into the tapered hole of the tool holder body, with the other end of the elastic collet located outside the tapered hole of the tool holder body. Then, place the tool holder nut onto the tool holder body with the elastic collet installed. Next, insert the tool shank into the inner hole of the elastic collet through the through hole. At this time, the abutting inclined surface on the inner ring of the bearing abuts against the outer tapered surface of the end of the elastic collet extending out of the tapered hole of the tool holder body. Then, tighten the tool holder nut so that the first internal thread of the rear inner shell is screwed into the thread of the outer side wall of the tool holder body. As the rear inner shell is gradually screwed into the tool holder body, the abutting inclined surface will gradually press down on the outer tapered surface of the elastic collet, and the elastic collet will gradually contract and clamp the tool shank until the tool holder nut presses the elastic collet tightly. Inside the tapered hole of the tool holder body, the elastic collet clamps the tool shank. During the process of screwing the tool holder nut into the tool holder body, the outer ring of the bearing rotates synchronously with the front outer cover and the rear inner shell. The outer ring of the bearing rotates relative to the inner ring of the bearing, so that the inner ring of the bearing does not rotate synchronously with the front outer cover and the rear inner shell. That is, the inner ring of the bearing does not rotate relative to the outer tapered surface of the elastic collet. There is no sliding friction between the inner ring of the bearing and the outer tapered surface of the elastic collet. The elastic collet is not subjected to torque during locking, which protects the elastic collet. Moreover, the abutting slope on the inner ring of the bearing only applies compressive force to the outer tapered surface of the elastic collet. On the one hand, it presses the elastic collet into the tapered hole of the tool holder body, and on the other hand, it compresses the elastic collet, causing the elastic collet to undergo elastic deformation and clamp the tool shank. In addition, the dust cover effectively prevents dust and other foreign objects from entering the bearing or the space between the rear inner shell and the tool holder body, thus preventing damage to the bearing and / or threads. This provides dust protection, extends the service life of the tool holder nut, and reduces the failure rate. Furthermore, the rear inner shell and front outer cover are detachable, facilitating disassembly and maintenance. This invention achieves modular assembly, making disassembly and maintenance convenient. During the locking or unlocking of the elastic collet and the tool, the front outer cover and rear inner shell do not slide against the outer conical surface of the elastic collet, preventing the collet from being subjected to torque and protecting it. It also provides excellent dust protection, preventing dust and other foreign objects from easily entering the bearing and rear inner shell, resulting in a long service life and low failure rate. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the body of the present invention, which is equipped with a flexible chuck and a tool holder.

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention, showing the installation of an elastic chuck and a tool holder body.

[0022] Figure 3This is an exploded structural diagram of the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the front outer cover of this utility model.

[0024] Figure 5 This is a three-dimensional structural diagram of the dust cover of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Rear inner shell; 2. Front outer cover; 3. Dust cover; 4. Bearing; 5. Retaining ring; 6. First mounting position; 7. Retaining ring; 8. Second mounting position; 9. Second internal thread; 10. Through hole; 11. Abutting bevel; 12. Teflon ring; 13. Dustproof inner ring; 14. First sealing ring; 15. Second sealing ring; 16. Limiting ring; 17. Third sealing ring; 18. Mounting ring; 19. Locking block; 20. Spring ball; 21. Locking position; 22. Annular groove; 23. Tightening groove; 24. Tightening insertion hole; 25. Elastic collet; 26. Tool holder body; 27. Raised ring. Detailed Implementation

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0028] like Figures 1 to 5 As shown, the present invention provides a tool holder nut, which includes a rear inner shell 1, a front outer cover 2, a dust cover 3, a bearing 4, and a retaining ring 5. The rear inner shell 1 has a first internal thread on its bore wall and an external thread on its outer side wall. The front outer cover has a first mounting position 6, a retaining ring 7, a second mounting position 8, and a second internal thread 9 in sequence on its bore wall. The front outer cover 2 is sleeved on the rear inner shell 1, and the second internal thread 9 is screwed to the external thread. The bearing 4 and the retaining ring 5 are installed in the second mounting position 8 in sequence. The outer ring of the bearing 4 is sandwiched between the retaining ring 7 and the retaining ring 5. The retaining ring 5 is sandwiched between the outer ring of the bearing 4 and the end face of the rear inner shell 1. The dust cover 3 is installed in the first mounting position 6 and covers the bearing 4. A through hole 10 is opened at the center of the dust cover 3. The inner ring bore wall of the bearing 4 has an abutting inclined surface 11.

[0029] In practical applications, when it is necessary to lock the elastic collet 25 onto the tool holder body 26, first insert one end of the elastic collet 25 into the tapered hole of the tool holder body 26, with the other end of the elastic collet 25 located outside the tapered hole of the tool holder body 26. Then, put the tool holder nut on the outside of the tool holder body 26 with the elastic collet 25 installed. Next, insert the tool shank into the inner hole of the elastic collet 25 through the through hole 10. At this time, the abutting inclined surface 11 on the inner ring of the bearing 4 abuts against the outer tapered surface of the end of the elastic collet 25 that extends out of the tapered hole of the tool holder body 26. Then, tighten the tool holder nut so that the first internal thread of the rear inner shell 1 is screwed into the thread of the outer side wall of the tool holder body 26. As the rear inner shell 1 is gradually screwed into the tool holder body 26, the abutting inclined surface 11 will gradually press down on the outer tapered surface of the elastic collet 25, and the elastic collet 25 will gradually retract and clamp the tool shank until the tool holder nut presses the elastic collet 25 tightly onto the tool holder. Inside the tapered hole of the body 26, the elastic collet 25 clamps the tool shank. During the process of screwing the tool shank nut into the tool shank body 26, the outer ring of the bearing 4 rotates synchronously with the front outer cover 2 and the rear inner shell 1. The outer ring of the bearing 4 rotates relative to the inner ring of the bearing 4, so that the inner ring of the bearing 4 does not rotate synchronously with the front outer cover 2 and the rear inner shell 1. That is, the inner ring of the bearing 4 does not rotate relative to the outer tapered surface of the elastic collet 25. There is no sliding friction between the inner ring of the bearing 4 and the outer tapered surface of the elastic collet 25. The elastic collet 25 is not subjected to torque during locking, which protects the elastic collet 25. Moreover, the abutting inclined surface 11 on the inner ring of the bearing 4 only applies a squeezing force to the outer tapered surface of the elastic collet 25. On the one hand, it presses the elastic collet 25 into the tapered hole of the tool shank body 26, and on the other hand, it compresses the elastic collet 25, causing the elastic collet 25 to undergo elastic deformation and clamp the tool shank. In addition, the dust cover 3 effectively prevents dust and other foreign objects from entering the bearing 4 or the space between the rear inner shell 1 and the tool holder body 26, thus preventing damage to the bearing 4 and / or the threads. This provides dust protection, extends the service life of the tool holder nut, and reduces the failure rate. Furthermore, the rear inner shell 1 and the front outer cover 2 are detachable, facilitating the disassembly and maintenance of the tool holder nut. This invention achieves modular assembly, making disassembly and maintenance convenient. During the locking or unlocking of the elastic collet 25 and the tool, the front outer cover 2 and the rear inner shell 1 will not slide against the outer conical surface of the elastic collet 25, preventing the elastic collet 25 from being subjected to torque and protecting it. It also provides excellent dust protection, preventing dust and other foreign objects from easily entering the bearing 4 and the rear inner shell 1, resulting in a long service life and a low failure rate.

[0030] Specifically, the retaining ring 5 is a plastic ring that serves as a cushioning and protective element.

[0031] In this embodiment, the tool holder nut also includes a Teflon ring 12. The Teflon ring 12 is installed in the first mounting position 6 and sandwiched between the bearing 4 and the retaining ring 5, with the Teflon ring 12 abutting against the inner end face of the bearing 4. The Teflon ring 12 not only supports the bearing 4, but also, due to its low coefficient of friction, good corrosion resistance, and high temperature resistance, does not affect the relative rotation between the outer ring and the inner ring of the bearing 4.

[0032] In this embodiment, the tool holder nut also includes a dustproof inner ring 13, which is fitted into the through hole 10 of the dust cover 3. In practical applications, the tool shank passes through the dustproof inner ring 13 and is then inserted into the inner hole of the elastic collet 25. The dustproof inner ring 13 further enhances the dustproof effect.

[0033] In this embodiment, a first sealing ring 14 is embedded in the wall of the through hole 10, and the first sealing ring 14 is sleeved on the outer wall of the dustproof inner ring 13. The first sealing ring 14 is used to seal the gap between the dustproof inner ring 13 and the dustproof cover 3, further improving the sealing performance and dustproof effect.

[0034] In this embodiment, a second sealing ring 15 is embedded in the hole wall of the dustproof inner ring 13; after the tool shank passes through the inner hole of the dustproof inner ring 13, the second sealing ring 15 is sleeved on the outside of the tool shank. The second sealing ring 15 is used to seal the gap between the tool shank and the dustproof inner ring 13, further improving the sealing performance and dustproof effect.

[0035] In this embodiment, a limiting ring 16 protrudes from the inner circumference of the dustproof inner ring 13. The limiting ring 16 is used to abut against the inner surface of the dustproof cover 3. When the tool holder nut locks the elastic collet 25, the limiting ring 16 abuts against the front end face of the elastic collet 25 to seal the gap between the dustproof inner ring 13 and the elastic collet 25, further improving the sealing and dustproof effect. In addition, the limiting ring 16 is clamped between the inner surface of the dustproof cover 3 and the elastic collet 25, and the limiting ring 16 can also prevent the dustproof inner ring 13 from detaching from the dustproof cover 3.

[0036] In this embodiment, a third sealing ring 17 is embedded in the inner side of the dust cover 3 and / or the front end face of the front outer cover 2. The third sealing ring 17 is sandwiched between the inner side of the dust cover 3 and the front end face of the front outer cover 2. The third sealing ring 17 is used to seal the gap between the dust cover 3 and the front outer cover 2, thereby further improving the sealing performance and dustproof effect.

[0037] In this embodiment, the inner wall of the dust cover 3 is provided with a mounting ring 18, which surrounds the edge of the through hole 10. At least two locking blocks 19 are protruding from the periphery of the mounting ring 18. A spring bead 20 is embedded in the mounting ring 18, and the ball of the spring bead 20 can extend out of the periphery of the mounting ring 18. The inner wall of the first mounting position 6 is provided with a plurality of locking positions 21 in a circular array around the central axis of the front outer cover 2. The inner wall of the first mounting position 6 is recessed with an annular groove 22. The plurality of locking positions 21 are located outside the annular groove 22 and communicate with the annular groove 22. The locking blocks 19 can rotate along the annular groove 22 and be locked in the annular groove 22. The ball of the spring bead 20 is used to engage with one of the locking positions 21. When all the locking blocks 19 are aligned with a locking position 21, all the locking blocks 19 can enter the annular groove 22 or move out of the annular groove 22. The locking blocks 19 are located on the side of the spring bead 20 near the bearing 4.

[0038] When assembling the dust cover 3 onto the front outer cover 2, first align all the locking blocks 19 with a locking slot 21, allowing each locking block 19 to enter the annular slot 22 from its corresponding slot 21. Then rotate the dust cover 3, causing the locking blocks 19 to rotate along the annular slot 22 until they are misaligned with the locking slot 21. At this point, the spring ball 20 extends into the corresponding locking slot 21, engaging with it. This prevents the dust cover 3 from rotating freely relative to the front outer cover 2, thus stably assembling the dust cover 3 onto the front outer cover 2. Conversely, the dust cover 3 can be disassembled from the front outer cover 2. This structural design facilitates the assembly, disassembly, and maintenance of the dust cover 3 and the front outer cover 2.

[0039] In this embodiment, there are multiple spring beads 20, and each locking block 19 is located between two spring beads 20. The sum of the number of spring beads 20 and the number of locking blocks 19 is not greater than the number of locking positions 21. This structural design facilitates the secure assembly of the dust cover 3 onto the front outer cover 2.

[0040] In this embodiment, the outer surface of the dust cover 3 is provided with a screw groove 23; specifically, the screw groove 23 is a non-circular groove. In practical applications, a suitable screwing tool is inserted into the screw groove 23, and the screwing tool screws the dust cover 3, causing the dust cover 3 to rotate relative to the front outer cover 2 until all the locking blocks 19 are aligned with a locking position 21, at which point the dust cover 3 can be removed from the front outer cover 2. Conversely, the dust cover 3 can be assembled onto the front outer cover 2.

[0041] Specifically, a protruding ring 27 is provided on the outer rear wall of the rear inner shell 1. The protruding ring 27 is used to abut against the rear end face of the front outer cover 2 to prevent the front outer cover 2 from being over-screwed to the rear inner shell 1 and damaging the threads.

[0042] Specifically, the peripheral wall of the convex ring 27 is recessed with multiple screw-in holes 24. Multiple inserts of the matching screw-in tool are inserted into the multiple screw-in holes 24 respectively, and then the screw-in tool is rotated so that the screw-in tool screws the inner shell 1, so as to realize the relative rotation between the inner shell 1 and the tool holder body 26, so as to disassemble or assemble the inner shell 1 and the tool holder body 26.

[0043] All technical features in this embodiment can be freely combined according to actual needs.

[0044] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A tool holder nut, characterized in that: The assembly includes a rear inner shell (1), a front outer cover (2), a dust cover (3), a bearing (4), and a retaining ring (5). The rear inner shell (1) has a first internal thread on its bore wall and an external thread on its outer side wall. The front outer shell has a first mounting position (6), a retaining ring (7), a second mounting position (8), and a second internal thread (9) on its bore wall in sequence. The second internal thread (9) is used to screw into the external thread. The bearing (4) and the retaining ring (5) are installed in the second mounting position (8) in sequence. The outer ring of the bearing (4) is sandwiched between the retaining ring (7) and the retaining ring (5). The retaining ring (5) is sandwiched between the outer ring of the bearing (4) and the end face of the rear inner shell (1). The dust cover (3) is installed in the first mounting position (6) and covers the bearing (4). A through hole (10) is opened in the center of the dust cover (3). The inner ring bore wall of the bearing (4) has a contacting slope (11).

2. The tool holder nut according to claim 1, characterized in that: The tool holder nut also includes a Teflon ring (12), which is installed in the first mounting position (6) and sandwiched between the bearing (4) and the retaining ring (5). The Teflon ring (12) abuts against the inner end face of the bearing (4).

3. The tool holder nut according to claim 1, characterized in that: The nut for the handle also includes a dustproof inner ring (13), which is fitted into the through hole (10) of the dustproof cover (3).

4. A tool holder nut according to claim 3, characterized in that: The wall of the through hole (10) is fitted with a first sealing ring (14), which is sleeved on the outer wall of the dustproof inner ring (13).

5. A tool holder nut according to claim 3, characterized in that: The inner dustproof ring (13) has a second sealing ring (15) embedded in its hole wall.

6. A tool holder nut according to claim 3, characterized in that: A limiting ring (16) is provided on the inner circumference of the dustproof inner ring (13), and the limiting ring (16) is used to abut against the inner side of the dustproof cover (3).

7. A tool holder nut according to claim 1, characterized in that: A third sealing ring (17) is fitted on the inner side of the dust cover (3) and / or the front end face of the front outer cover (2), and the third sealing ring (17) is sandwiched between the inner side of the dust cover (3) and the front end face of the front outer cover (2).

8. A tool holder nut according to claim 1, characterized in that: The inner wall of the dust cover (3) is provided with a mounting ring (18), which surrounds the edge of the through hole (10). At least two locking blocks (19) are protruding from the periphery of the mounting ring (18). A spring bead (20) is embedded in the mounting ring (18), and the spring bead (20) can extend out of the periphery of the mounting ring (18). The inner wall of the first mounting position (6) is provided with multiple locking positions (21) arranged in a ring array around the central axis of the front outer cover (2). The inner wall of the first mounting position (6) is concave. An annular slot (22) is provided, and multiple slots (21) are located outside the annular slot (22) and communicate with the annular slot (22). The card block (19) can rotate along the annular slot (22) and be locked in the annular slot (22). The ball of the spring ball (20) is used to engage with one of the slots (21). When all the card blocks (19) are aligned with a slot (21), all the card blocks (19) can enter the annular slot (22) or move out of the annular slot (22).

9. A tool holder nut according to claim 8, characterized in that: There are multiple spring beads (20), and each block (19) is located between two spring beads (20). The sum of the number of spring beads (20) and the number of blocks (19) is not greater than the number of slots (21).

10. A tool holder nut according to claim 1, characterized in that: The outer side of the dust cover (3) is provided with a screw groove (23).

Images