A front-mounted toolbar tensioner

Abstract

The application discloses a front-mounted cutter bar tensioning device, which comprises a cutter handle and a cutter head mounted at the front end of the cutter handle, the front end of the cutter handle is provided with a tapered positioning hole, the cutter head is provided with a mounting part matched with the positioning hole, the mounting part is embedded in the positioning hole, a connecting bolt for fixedly connecting the cutter handle and the cutter head is arranged between the cutter head and the cutter handle, the cutter head is provided with a mounting hole penetrating along the axial direction of the cutter head, one end of the connecting bolt located in the mounting hole is provided with a countersunk hole for inserting a screwing tool, the cutter head is further provided with an annular abutting part, the front end of the cutter handle is provided with a supporting table corresponding to the abutting part, and the abutting part abuts against the front end of the cutter handle after the cutter head is mounted. The cutter head can be replaced by screwing the connecting bolt, and the structure is simple and convenient to disassemble and assemble. Meanwhile, the cooperation of the tapered positioning hole and the mounting part can guarantee good coaxiality after the cutter head is replaced and assembled. The cooperation of the abutting part and the supporting table can guarantee the height of the cutter head after being mounted, and guarantee the use reliability of the cutter head after being replaced.

Description

Technical Field

[0001] This invention relates to the field of machining, and more specifically to a front-mounted tool holder tensioning device. Background Technology

[0002] In the field of metal processing, machining is often used to process workpieces. The main structure involves a rotating spindle driving a tool holder, on which a cutting head is mounted. The rotation of the tool holder drives the cutting head to perform operations such as boring and milling. However, due to limitations in their application scenarios, the cutting head has a short service life and needs frequent replacement after wear and tear. Current tool replacement methods are time-consuming and labor-intensive. Some cutting heads require removal from the spindle along with the tool holder, a complex and time-consuming process. Furthermore, maintaining stable concentricity is difficult during replacement, requiring recalibration after installation. To address these issues, a front-mounted tool holder tensioning device is proposed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a front-mounted tool holder tensioning device that is simple in structure, reliable in installation, and can ensure concentricity and installation height after installation.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a front-mounted tool holder tensioning device, comprising a tool holder and a tool head installed at the front end of the tool holder, characterized in that the front end of the tool holder is provided with a tapered positioning hole, the tool head is provided with a mounting part matching the positioning hole, the mounting part is embedded in the positioning hole, a connecting bolt for fixing the tool holder and the tool head is provided between the tool head and the tool holder, the tool head is provided with a mounting hole through its axial direction, one end of the connecting bolt located in the mounting hole is provided with a countersunk hole for inserting a tightening tool, the tool head is also provided with an annular abutment part, the front end of the tool holder is provided with a support platform corresponding to the abutment part, the abutment part abuts against the front end of the tool holder after the tool head is installed.

[0005] Preferably, the rear end of the mounting part is provided with a flat opening, and two opposing blocks are fixed in the positioning hole, forming a groove between the two opposing blocks, and the flat opening is embedded in the groove; the advantage is that the cooperation between the flat opening and the groove can prevent the cutting head from rotating during installation or use, thereby ensuring the relative stillness of the cutting head and the cutting shank, improving the ease of installation and cutting stability.

[0006] Preferably, the head of the connecting bolt is rotatably disposed in the mounting hole, the countersunk hole is opened on the axis of the head, the screw of the connecting bolt is coaxially screwed with the tool holder, and a clamping platform that mates with the head is provided on the inner wall of the mounting hole, with the screw passing through the clamping platform; the advantage is that the screw connection between the screw and the tool holder, and the engagement between the head and the clamping platform, allow for quick assembly and disassembly of the clamping tool head, ensuring the stability between the tool head and the tool holder.

[0007] Furthermore, the head cap of the connecting bolt does not extend beyond the front end of the cutting head; the advantage is that the head cap not extending beyond the front end of the cutting head can avoid interference with the workpiece and improve the reliability of the cutting head machining.

[0008] Preferably, the mounting hole includes a front hole and a connecting hole arranged coaxially. The diameter of the front hole is smaller than the diameter of the connecting hole. The portion of the connecting bolt located inside the connecting hole is screwed into the inner wall of the connecting hole, and the portion of the connecting bolt located inside the connecting hole is screwed into the wall of the mounting hole. The advantage is that the front hole facilitates the insertion of the tightening tool, while ensuring the coaxial stability of the tightening tool and the connecting bolt, thereby improving the stability of tightening the connecting bolt.

[0009] Furthermore, the portion of the connecting bolt located inside the connecting hole is provided with a reverse thread, while the other portion of the connecting bolt located outside the connecting hole is provided with a positive thread. The tool holder is provided with a fixing hole, and the portion of the connecting bolt with the positive thread is screwed into the inner wall of the fixing hole. The advantage is that the cooperation between the reverse thread and the connecting hole, and the positive thread and the fixing hole, allows for the simultaneous tightening of the tool head and the tool holder when tightening the connecting bolt, thereby improving installation efficiency and the tightening stability of the tool head.

[0010] Furthermore, the tool holder is also provided with a fixing platform and an assembly hole located at the rear end of the fixing platform. The fixing platform is provided with a fixing hole coaxial with the connecting hole. The other end of the connecting bolt away from the tool head passes through the fixing hole, and the other end of the connecting bolt is also provided with a screw head, which is rotatably disposed in the assembly hole. The advantage is that the tool head can be quickly disassembled and replaced by the cooperation of the connecting bolt, screw head and fixing platform, and the disassembly and replacement can be completed by removing only the tool head without removing the connecting bolt, thus improving the disassembly and assembly efficiency.

[0011] Furthermore, a limiting bolt is screwed onto the inner wall of the assembly hole, and the limiting bolt is close to the screw head; the advantage is that the limiting bolt can ensure the stability of the connecting bolt, and at the same time, it plays a supporting role in the initial stage of the assembly head, that is, it provides axial support force to facilitate the tightening of the connecting bolt.

[0012] Preferably, the support platform is cylindrical, the positioning hole is coaxially arranged with the support platform, and the inner edge of the support platform is chamfered; the advantage is that the chamfer makes it easier for the mounting part of the cutter head to be inserted into the positioning hole and reduces the scratching of the mounting part.

[0013] Compared with existing technologies, the advantages of this invention are that the cutter head can be replaced simply by tightening the connecting bolts, making the structure simple and easy to disassemble and replace; at the same time, the fit between the tapered positioning hole and the mounting part ensures good coaxiality after the cutter head is replaced and reassembled. Furthermore, the fit between the abutment part and the support platform ensures the height of the cutter head after installation, thereby guaranteeing the reliability of use after cutter head replacement. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a three-dimensional structural diagram of Example 1; Figure 2 This is a cross-sectional structural diagram of Example 1; Figure 3 This is a schematic diagram showing the fit between the cutter head and the connecting bolt in Example 1; Figure 4 This is a schematic diagram of the cutter head in Example 1; Figure 5 These are schematic diagrams illustrating the fit between the cutter head and the cutter holder in Examples 2 and 3. Figure 6 This is a schematic diagram showing the position of the groove in Embodiments 2 and 3; Figure 7 These are schematic diagrams of the cutter head in Examples 2 and 3; Figure 8 These are schematic cross-sectional views of the cutter head in Examples 2 and 3. Figure 9 This is a cross-sectional structural diagram of Example 2; Figure 10 This is a schematic diagram showing the fit between the cutter head and the connecting bolt in Example 2; Figure 11 This is a schematic diagram of the connecting bolts in Example 2; Figure 12 This is a cross-sectional structural diagram of Example 3; Figure 13 This is a schematic diagram of the fit between the cutter head and the connecting bolt in Example 3. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1-13 The present invention will be described in further detail.

[0017] 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.

[0018] A front-mounted tool holder tensioning device includes a tool holder 1 and a tool head 2 mounted on the front end of the tool holder 1. The front end of the tool holder 1 has a tapered positioning hole 1.1, and the tool head has a mounting part 2.1 that matches the positioning hole 1.1. The mounting part 2.1 is interference-fitted into the positioning hole 1.1. A connecting bolt 3 is provided between the tool head and the tool holder 1 for fixing and connecting the tool holder 1 and the tool head. The tool head has a mounting hole 2.2 extending through its axial direction. One end of the connecting bolt 3 located in the mounting hole 2.2 has a countersunk hole 3.2 for inserting a tightening tool. The tool head also has an annular abutment part 2.3. The front end of the tool holder 1 has a support platform 1.4 corresponding to the abutment part 2.3. After the tool head is installed, the abutment part 2.3 abuts against the front end of the tool holder 1. This technical solution allows for quick tool head replacement, has a simple structure, and is easy to disassemble and replace. Simultaneously, the fit between the tapered positioning hole 1.1 and the mounting part 2.1 ensures good coaxiality after tool head replacement and assembly. The cooperation between the abutment 2.3 and the support platform 1.4 ensures the height of the cutter head after installation, thereby ensuring the reliability of use after the cutter head is replaced.

[0019] Based on the above, the rear end of the mounting part 2.1 of the present invention is provided with a flat opening 2.11, and two opposing stops 1.2 are fixed in the positioning hole 1.1. A groove 1.3 is formed between the two opposing stops 1.2, and the flat opening 2.11 is embedded in the groove 1.3, as shown in the attached figure. Figure 6 and attached Figure 7 As shown. The fit between the flat end 2.11 and the groove 1.3 prevents the cutter head from rotating during installation or use, thus ensuring the relative stillness of the cutter head and the tool holder 1, improving installation convenience and cutting stability.

[0020] Example 1: A front-mounted tool holder tensioning device includes a tool holder 1 and a tool head 2 installed at the front end of the tool holder 1. The front end of the tool holder 1 is provided with a tapered positioning hole 1.1, and the tool head is provided with a mounting part 2.1 that matches the positioning hole 1.1. The mounting part 2.1 is embedded in the positioning hole 1.1. A connecting bolt 3 for fixing the tool holder 1 and the tool head is provided between the tool head and the tool holder 1. The tool head is provided with a mounting hole 2.2 through it along its axial direction. One end of the connecting bolt 3 located in the mounting hole 2.2 is provided with a countersunk hole 3.2 for inserting a screwing tool. The tool head is also provided with an annular abutment part 2.3. The front end of the tool holder 1 is provided with a support platform 1.4 corresponding to the abutment part 2.3. After the tool head is installed, the abutment part 2.3 abuts against the front end of the tool holder 1. The head cap 3.1 of the connecting bolt 3 is rotatably mounted in the mounting hole 2.2. The countersunk hole 3.2 is located on the axis of the head cap 3.1. The threaded rod of the connecting bolt 3 is coaxially threaded with the tool holder 1. A clamping platform 2.4 that mates with the head cap 3.1 is provided on the inner wall of the mounting hole 2.2, and the threaded rod passes through the clamping platform 2.4. The threaded connection between the threaded rod and the tool holder 1, as well as the engagement between the head cap 3.1 and the clamping platform 2.4, allows for quick assembly and disassembly of the clamping tool head, ensuring the stability between the tool head and the tool holder 1.

[0021] It is worth mentioning that, based on Embodiment 1, the cap 3.1 of the connecting bolt 3 does not extend beyond the front end of the cutting head. Preferably, the front end of the cap 3.1 is flush with the cutting head. The cap 3.1 not extending beyond the front end of the cutting head avoids interference with the workpiece and improves the reliability of the cutting head machining.

[0022] Example 2: A front-mounted tool holder tensioning device includes a tool holder 1 and a tool head 2 installed at the front end of the tool holder 1. The front end of the tool holder 1 is provided with a tapered positioning hole 1.1. The tool head is provided with a mounting part 2.1 that matches the positioning hole 1.1. The mounting part 2.1 is embedded in the positioning hole 1.1. A connecting bolt 3 is provided between the tool head and the tool holder 1 for fixing and connecting the tool holder 1 and the tool head. The tool head is provided with a mounting hole 2.2 through it along its axial direction. One end of the connecting bolt 3 located in the mounting hole 2.2 is provided with a countersunk hole 3.2 for inserting a screwing tool. The tool head is also provided with an annular abutment part 2.3. The front end of the tool holder 1 is provided with a support platform 1.4 corresponding to the abutment part 2.3. After the tool head is installed, the abutment part 2.3 abuts against the front end of the tool holder 1. The aforementioned mounting hole 2.2 includes a coaxially arranged front hole 2.21 and a connecting hole 2.22. The diameter of the front hole 2.21 is smaller than the diameter of the connecting hole 2.22. The portion of the connecting bolt 3 located inside the connecting hole 2.22 is screwed into the inner wall of the connecting hole 2.22, and the portion of the connecting bolt 3 located inside the connecting hole 2.22 is screwed into the wall of the mounting hole 2.2. Simultaneously, the portion of the connecting bolt 3 located inside the connecting hole 2.22 is provided with a reverse thread 3.5, and the other portion of the connecting bolt 3 located outside the connecting hole 2.22 is provided with a positive thread 3.4. The tool holder 1 is provided with a fixing hole 1.5, and the portion of the connecting bolt 3 with the positive thread 3.4 is screwed into the inner wall of the fixing hole. The engagement of the reverse thread 3.5 with the connecting hole 2.22 and the positive thread 3.4 with the fixing hole allows for simultaneous tightening of the tool head and tool holder 1 when tightening the connecting bolt 3, improving installation efficiency and the stability of the tool head's tightening.

[0023] Example 3: A front-mounted tool holder tensioning device includes a tool holder 1 and a tool head 2 installed at the front end of the tool holder 1. The front end of the tool holder 1 is provided with a tapered positioning hole 1.1, and the tool head is provided with a mounting part 2.1 that matches the positioning hole 1.1. The mounting part 2.1 is embedded in the positioning hole 1.1. A connecting bolt 3 for fixing the tool holder 1 and the tool head is provided between the tool head and the tool holder 1. The tool head is provided with a mounting hole 2.2 through it along its axial direction. One end of the connecting bolt 3 located in the mounting hole 2.2 is provided with a countersunk hole 3.2 for inserting a screwing tool. The tool head is also provided with an annular abutment part 2.3. The front end of the tool holder 1 is provided with a support platform 1.4 corresponding to the abutment part 2.3. After the tool head is installed, the abutment part 2.3 abuts against the front end of the tool holder 1. The aforementioned mounting hole 2.2 includes a front hole 2.21 and a connecting hole 2.22 coaxially arranged. The diameter of the front hole 2.21 is smaller than the diameter of the connecting hole 2.22. The portion of the connecting bolt 3 located inside the connecting hole 2.22 is screwed into the inner wall of the connecting hole 2.22, and the portion of the connecting bolt 3 located inside the connecting hole 2.22 is screwed into the wall of the mounting hole 2.2. The tool holder 1 is also provided with a fixing platform 1.6 and an assembly hole 1.9 located at the rear end of the fixing platform 1.6. The fixing platform 1.6 is provided with a fixing hole 1.5 coaxial with the connecting hole 2.22. The other end of the connecting bolt 3, away from the tool head, passes through the fixing hole, and the other end of the connecting bolt 3 is a screw head 3.3. The screw head 3.3 is rotatably disposed in the assembly hole 1.9. Through the cooperation of the connecting bolt 3, the screw head 3.3, and the fixing platform 1.6, the tool head can be quickly disassembled and replaced without removing the connecting bolt 3; only the tool head needs to be disassembled to complete the disassembly and replacement, thus improving disassembly and assembly efficiency.

[0024] Based on Embodiment 3, in order to ensure the reliable tightening of the connecting bolt 3, a limiting bolt 1.8 is screwed into the inner wall of the assembly hole 1.9. The limiting bolt 1.8 is close to the screw head 3.3. The limiting bolt 1.8 can ensure the stability of the connecting bolt 3, push out the cutting head when disassembling the cutting head, and provide support in the initial stage of assembling the cutting head, that is, provide axial support force to facilitate the tightening of the connecting bolt 3.

[0025] It should be noted that the support platform 1.4 of the present invention is cylindrical, and the positioning hole 1.1 is coaxially arranged with the support platform 1.4, and the inner edge of the support platform 1.4 is chamfered. The support platform 1.4 can reliably fit with the support part, thereby providing reliable support for the support part. At the same time, the chamfer facilitates the insertion of the mounting part 2.1 of the cutter head into the positioning hole 1.1 and reduces scratching of the mounting part 2.1.

[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 implementation of the present invention may be made without departing from the principles.

Claims

1. A front-mounted tool holder tensioning device, comprising a tool holder and a tool head mounted on the front end of the tool holder, characterized in that, The front end of the handle is provided with a tapered positioning hole, and the cutting head is provided with a mounting part that matches the positioning hole. The mounting part is embedded in the positioning hole. A connecting bolt for fixing the handle and the cutting head is provided between the cutting head and the handle. The cutting head has a mounting hole that extends through it along its axial direction. One end of the connecting bolt located in the mounting hole is provided with a countersunk hole for inserting a screwdriver. The cutting head is also provided with an annular abutment. The front end of the handle is provided with a support platform corresponding to the abutment. The abutment abuts against the front end of the handle after the cutting head is installed.

2. The front-mounted tool holder tensioning device according to claim 1, characterized in that, The rear end of the mounting part is provided with a flat opening, and two opposing blocks are fixed in the positioning hole. A groove is formed between the two opposing blocks, and the flat opening is embedded in the groove.

3. The front-mounted tool holder tensioning device according to claim 1, characterized in that, The head of the connecting bolt is rotatably mounted in the mounting hole, the countersunk hole is opened on the axis of the head, the screw of the connecting bolt is coaxially screwed with the tool holder, and the inner wall of the mounting hole is provided with a clamping platform that cooperates with the head, and the screw passes through the clamping platform.

4. The front-mounted tool holder tensioning device according to claim 3, characterized in that, The cap of the connecting bolt does not extend beyond the front end of the cutting head.

5. The front-mounted tool holder tensioning device according to claim 1, characterized in that, The mounting hole includes a front hole and a connecting hole arranged coaxially. The diameter of the front hole is smaller than the diameter of the connecting hole. The portion of the connecting bolt located inside the connecting hole is screwed into the inner wall of the connecting hole, and the portion of the connecting bolt located inside the connecting hole is screwed into the wall of the mounting hole.

6. The front-mounted tool holder tensioning device according to claim 5, characterized in that, The portion of the connecting bolt inside the connecting hole is provided with a reverse thread, and the other portion of the connecting bolt outside the connecting hole is provided with a positive thread. The tool holder is provided with a fixing hole, and the portion of the connecting bolt with the positive thread is screwed into the inner wall of the fixing hole.

7. The front-mounted tool holder tensioning device according to claim 5, characterized in that, The tool holder is also provided with a fixing platform and an assembly hole located at the rear end of the fixing platform. The fixing platform is provided with a fixing hole coaxial with the connecting hole. The other end of the connecting bolt away from the tool head passes through the fixing hole. The other end of the connecting bolt is a screw head, which is rotatably disposed in the assembly hole.

8. The front-mounted tool holder tensioning device according to claim 7, characterized in that, A limiting bolt is screwed onto the inner wall of the assembly hole, and the limiting bolt is close to the screw head.

9. A front-mounted tool holder tensioning device according to claim 1, characterized in that, The support platform is cylindrical, the positioning hole is coaxially arranged with the support platform, and the inner edge of the support platform is chamfered.

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