Disassembly-free rear broaching cutter bar device

Abstract

The invention discloses a disassembly-free rear broaching cutter bar device which comprises a cutter head and a cutter handle, one end of the cutter handle is provided with an assembling cavity used for installing the cutter head, the cutter handle is further internally provided with an installing cavity, a screw rod is rotatably arranged in the installing cavity, the screw rod and the cutter handle are coaxially arranged, one end of the screw rod extends to the assembling cavity, and the cutter head and the screw rod are fixed in a threaded connection mode. A quick-change assembly is further arranged in the mounting cavity and comprises a driving part and a driven wheel, the driving part is rotationally arranged in the mounting cavity, the cutter handle is provided with an adjusting hole corresponding to the driving part, the driven wheel is fixed to the screw rod, and the driving part drives the driven wheel to rotate; the tool bit is characterized in that the tool bit can be conveniently replaced through the arranged quick-release assembly, meanwhile, the concentricity of the tool bit after replacement can be guaranteed, and therefore in an existing design, the efficiency is improved through the calibration step after tool bit replacement.

Description

Technical Field

[0001] This invention relates to the field of machining tools, and more specifically to a non-removable pull-back shank device. Background Technology

[0002] In the machining field, to process workpieces made of materials such as metal, a rotating spindle drives a tool holder to rotate, and the tool holder is equipped with the required cutting head. The rotation of the tool holder then drives the cutting head to perform boring and milling operations on the workpiece. However, in actual use, the cutting head has a short service life due to the limitations of its application scenarios, requiring frequent replacement after wear and tear. Existing tools require recalibration after cutting head replacement, which is time-consuming and labor-intensive. Furthermore, some cutting head replacements require removing the tool holder from the spindle, a complex and time-consuming process. For example, some existing cutting heads have a screw at the rear and a threaded hole at the front of the tool holder, secured by a threaded connection. However, direct threaded fixation during disassembly and machining causes pressure wear on the threaded threads, leading to decreased concentricity accuracy and requiring lengthy calibration. Some existing designs use a slot at the end of the tool holder, into which the cutting head is inserted and then secured with bolts on both sides, allowing for convenient cutting head replacement. While this solution improves the efficiency of tool head replacement, in practical use, the precision adjustment process after bolt tightening is complex, making it difficult to maintain stable concentricity. To address these issues, a non-disassembly pull-back tool holder device is proposed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a non-disassembly pull-back bar device that is simple in structure, easy to disassemble the cutter head, and can effectively maintain concentricity.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a non-disassembly pull-back tool holder device, including a tool head and a tool holder, one end of the tool holder is provided with an assembly cavity for installing the tool head, and the inside of the tool holder is also provided with an installation cavity, in which a screw is rotatably disposed, the screw is coaxially disposed with the tool holder, and one end of the screw extends into the assembly cavity, the tool head is screwed and fixed to the screw, and a quick-change assembly is also provided in the installation cavity, the quick-change assembly includes a driving component and a driven wheel, the driving component is rotatably disposed in the installation cavity, the tool holder has an adjustment hole corresponding to the driving component, the driven wheel is fixed to the screw, and the driving component drives the driven wheel to rotate.

[0005] Preferably, the cutting head is provided with a support surface on the side near the shank, and the support surface is provided with a connecting platform. The connecting platform is frustum-shaped and has a threaded hole that mates with the screw. The assembly cavity is adapted to the connecting platform. The advantage is that the matching of the connecting platform and the assembly cavity facilitates the installation of the cutting head.

[0006] Furthermore, the threaded hole and the screw are coaxially arranged. After assembly, the outer side of the connecting platform contacts the inner sidewall of the assembly cavity, and the supporting surface abuts against the front end of the tool holder. The advantage is that the threaded hole and the screw can be used to pull the tool head back during assembly. At the same time, the arrangement of the connecting platform and the assembly cavity can ensure the concentricity of the tool head during axial movement. After being tightened and fixed, the supporting surface abuts against the front end of the tool holder, further ensuring the working stability of the tool head, that is, avoiding the shaking of the tool head.

[0007] Furthermore, an intermediate hole is provided between the assembly cavity and the mounting cavity, and the screw passes through the intermediate hole.

[0008] Furthermore, the tool holder is provided with a limiting post located between the assembly cavity and the mounting cavity, and the intermediate hole passes through the limiting post; the advantage is that the limiting post can radially limit the screw, ensuring the reliability of the screw rotation.

[0009] Furthermore, an anti-detachment ring is fixed to the other end of the screw, with one side of the anti-detachment ring close to the limiting post. The advantage is that the anti-detachment ring, the limiting post, and the drive component work together to limit the axial movement of the screw, prevent the screw from moving axially, and ensure the reliability of the screw and drive component's connection.

[0010] Furthermore, the driven wheel is coaxially fixed at the other end of the screw, and the driven wheel meshes with the driving member.

[0011] Furthermore, the driving component includes a coaxially fixed driving wheel and a driving rod, the driving wheel meshing with the driven wheel, and the driving rod rotating with the tool holder; the advantage is that the driven wheel can drive the driven wheel to rotate, which can realize the quick assembly and disassembly of the tool head, that is, realize the screw connection between the screw and the tool head for disassembly or fixation.

[0012] Furthermore, the driving component includes a driving rod, a portion of which is configured as a worm gear, and the driven wheel is a worm wheel; the advantage is that the worm gear and worm wheel combination is suitable for small spaces and has self-locking capability, thereby improving the tensioning stability of the screw.

[0013] Furthermore, one end of the drive rod extends into the adjustment hole, and a limit ring is provided at this end. The limit ring fits into the interior of the adjustment hole. A fixing hole is provided inside the mounting cavity, and an annular fixing groove is provided on the inner wall of the adjustment hole. A fixing ring is embedded in the fixing groove to prevent the drive rod from moving axially. The other end of the drive rod is rotatably embedded in the fixing hole. The advantage is that the axial movement of the drive rod is restricted by the cooperation of the fixing hole and the fixing ring, thereby ensuring the stability of the drive rod rotation. Moreover, the adjustment hole allows the user to easily adjust the rotation of the drive rod.

[0014] Compared with the prior art, the advantage of the present invention is that the quick-release component allows for convenient replacement of the cutter head, while ensuring the concentricity of the cutter head after replacement, thereby improving the efficiency of the calibration step after the cutter head is replaced in the existing design. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is the overall structural entity of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram showing the cooperation between the blade and the quick-release assembly of the present invention; Figure 4 This is a cross-sectional schematic diagram of the tool holder of the present invention. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0019] As attached Figure 1-4 The illustrated non-removable pull-back tool holder device includes a tool head 1 and a tool holder 4 mounted on a spindle. One end of the tool holder 4 is provided with an assembly cavity 4.1 for mounting the tool head 1. The tool holder 4 also has an installation cavity 4.2 inside, in which a screw 2 is rotatably mounted. The screw 2 is coaxially mounted with the tool holder 4, and one end of the screw 2 extends into the assembly cavity 4.1. The tool head 1 is screwed and fixed to the screw 2. The installation cavity 4.2 also has a quick-change assembly 3, which includes a driving component 3.1 and a driven wheel 3.2. The driving component 3.1 is rotatably mounted in the installation cavity 4.2. The tool holder 4 has an adjustment hole 4.5 corresponding to the driving component 3.1. The driven wheel 3.2 is fixed to the screw 2, and the driving component 3.1 drives the driven wheel 3.2 to rotate.

[0020] Specifically, a support surface 1.1 is provided on the side of the cutter head 1 near the handle 4. The support surface 1.1 has a connecting platform 1.2, which is frustum-shaped. The connecting platform 1.2 has a threaded hole 1.3 that mates with the screw 2. The assembly cavity 4.1 is adapted to the connecting platform 1.2. The threaded hole 1.3 is coaxial with the screw 2. After assembly, the outer surface of the connecting platform 1.2 contacts the inner wall of the assembly cavity 4.1, and the support surface 1.1 abuts against the front end of the handle 4. The engagement of the threaded hole 1.3 with the screw 2 allows the cutter head 1 to be pulled back during assembly. Simultaneously, the arrangement of the connecting platform 1.2 and the assembly cavity 4.1 ensures the concentricity of the cutter head 1 during axial movement. After tightening and fixing, the support surface 1.1 abuts against the front end of the handle 4, further ensuring the working stability of the cutter head 1 and preventing it from shaking.

[0021] In this invention, an intermediate hole 4.4 is provided between the assembly cavity 4.1 and the mounting cavity 4.2, and the screw 2 passes through the intermediate hole 4.4. Specifically, a limiting post 4.3 is provided inside the tool holder 4, located between the assembly cavity 4.1 and the mounting cavity 4.2. The intermediate hole 4.4 is located at the axis of the limiting post 4.3 and passes through the limiting post 4.3. The limiting post 4.3 can radially limit the screw 2, ensuring the reliability of the screw 2's rotation.

[0022] Based on the above, an anti-detachment ring 2.1 is fixed to the other end of the screw 2, with one side of the anti-detachment ring 2.1 close to the limiting post 4.3. This prevents axial movement of the screw 2 and ensures the reliable fit between the screw 2 and the driving component 3.1.

[0023] It is worth mentioning that the driven wheel 3.2 is coaxially fixed at the other end of the screw 2, and the driven wheel 3.2 meshes with the driving component 3.1. Specifically, the driving component 3.1 includes a coaxially fixed driving wheel 3.13 and a driving rod 3.11. The driving wheel 3.13 meshes with the driven wheel 3.2, and the driving rod 3.11 is rotatably engaged with the tool holder 4. Both the driving wheel 3.13 and the driven wheel 3.2 can be bevel gears; or the driving wheel 3.13 can be a spur gear, and the driven wheel 3.2 can be a face gear. By driving the driven wheel 3.2 to rotate through the driving wheel 3.13, the tool head 1 can be quickly disassembled and assembled, that is, the screw 2 and the tool head 1 can be screwed together, disassembled, or tightened.

[0024] Of course, the driving component 3.1 of the present invention can also be a driving rod 3.11. Part of the driving rod 3.11 is set as a worm gear, and the driven wheel 3.2 is a worm wheel. The cooperation of the worm wheel and worm gear is more suitable for small spaces and has self-locking ability, thereby improving the tensioning stability of the screw 2.

[0025] It should be noted that, based on the above, one end of the drive rod 3.11 extends into the adjustment hole 4.5. This end is provided with a limit ring 3.12, and can be configured as an internal hexagonal head or a bolt head for easy tightening with a wrench. The limit ring 3.12 fits snugly against the interior of the adjustment hole 4.5. A fixing hole 4.6 is provided inside the mounting cavity 4.2. An annular fixing groove 4.7 is provided on the inner wall of the adjustment hole 4.5. A retaining ring 5 is embedded in the retaining groove 4.7 to prevent axial movement of the drive rod 3.11. The other end of the drive rod 3.11 is rotatably fitted into the fixing hole 4.6. The engagement of the fixing hole 4.6 and the retaining ring 5 restricts the axial movement of the drive rod 3.11, thereby ensuring the stability of the drive rod 3.11's rotation. Furthermore, the adjustment hole 4.5 allows the user to easily adjust the rotation of the drive rod 3.11.

[0026] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A non-disassembly pull-back tool holder device, comprising a tool head and a tool holder, characterized in that, One end of the tool holder is provided with an assembly cavity that matches the tool head. The inside of the tool holder is also provided with an installation cavity. A screw is rotatably disposed in the installation cavity. The screw is coaxially disposed with the tool holder, and one end of the screw extends into the assembly cavity. The tool head is detachably screwed to the screw. A quick-change assembly is also provided in the installation cavity. The quick-change assembly includes a driving component and a driven wheel. The driving component is rotatably disposed in the installation cavity. The tool holder has an adjustment hole corresponding to the driving component. The driven wheel is fixed to the screw. The driving component drives the driven wheel to rotate.

2. The non-disassembly-free pull-back bar device according to claim 1, characterized in that, The cutting head has a support surface on the side near the handle, and the support surface has a connecting platform. The connecting platform is frustum-shaped and has a threaded hole that mates with the screw. The assembly cavity is adapted to the connecting platform.

3. The non-disassembly-free pull-back bar device according to claim 2, characterized in that, The threaded hole is coaxially arranged with the screw. After assembly, the outer side of the connecting platform contacts the inner sidewall of the assembly cavity, and the supporting surface abuts against the front end of the tool holder.

4. The non-disassembly pull-back bar device according to claim 1, characterized in that, An intermediate hole is provided between the assembly cavity and the mounting cavity, and the screw passes through the intermediate hole.

5. The non-disassembly-free pull-back bar device according to claim 4, characterized in that, The tool holder is provided with a limiting post located between the assembly cavity and the mounting cavity, and the intermediate hole passes through the limiting post.

6. The non-disassembly-free pull-back bar device according to claim 5, characterized in that, The other end of the screw is fixed with an anti-detachment ring, one side of which is close to the limiting post.

7. The non-disassembly-free pull-back bar device according to claim 6, characterized in that, The driven wheel is coaxially fixed at the other end of the screw, and the driven wheel meshes with the driving member.

8. The non-disassembly-free pull-back bar device according to claim 7, characterized in that, The driving component includes a coaxially fixed driving wheel and a driving rod. The driving wheel meshes with the driven wheel, and the driving rod is rotatably engaged with the tool holder.

9. The non-disassembly pull-back bar device according to claim 7, characterized in that, The driving component includes a driving rod, a portion of which is configured as a worm gear, and the driven wheel is a worm wheel.

10. A non-disassembly pull-back bar device according to claim 8 or 9, characterized in that, One end of the drive rod extends into the adjustment hole, and a limit ring is provided at this end. The limit ring fits into the interior of the adjustment hole. A fixing hole is provided inside the mounting cavity. An annular fixing groove is provided on the inner wall of the adjustment hole. A fixing ring is embedded in the fixing groove to prevent the drive rod from moving axially. The other end of the drive rod is rotatably embedded in the fixing hole.

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