Grinding head quick-changing structure of internal grinding machine

Abstract

The utility model provides a grinding head quick-changing structure of an internal grinding machine, and belongs to the technical field of grinding machines. One end of the main shaft is connected with the chuck rod with the clamping end, the clamping end is arranged in a barrel shape, the outer side wall of the clamping end is provided with the clamping thread, the outer side wall of the clamping end is of the conical structure with the deformation grooves, the clamping thread is provided with the quick-release nut in a matched mode, and the quick-release nut is arranged on the outer side wall of the clamping end. Due to the fact that the nut is arranged on the clamping end, when one end of a clamping rod of the grinding head is inserted into the clamping end, the clamping rod can be clamped or loosened by screwing the nut, a polygonal inserting hole is formed in the barrel bottom of the clamping end, a polygonal inserting head is arranged at the end of the clamping rod, and circumferential limiting can be achieved by inserting the polygonal inserting head into the polygonal inserting hole. By means of the structure, the grinding head installation requirement can be met, synchronous rotation of the grinding head and the chuck rod can be achieved, only the quick-release nut needs to be screwed during disassembly and replacement, operation is easy, the replacement efficiency is higher, and the grinding head quick-release requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of grinding machine technology, specifically to a quick-change structure for the grinding head of an internal cylindrical grinding machine. Background Technology

[0002] Grinding machines, as a type of machining equipment, can perform grinding processes on workpieces, improve grinding efficiency, and ensure product quality. They are widely used in the machining industry.

[0003] An internal grinding machine is a machining equipment used to grind the inner surface or end face of a workpiece. It uses a high-speed rotating grinding wheel to cut the inner wall of the workpiece, improving the dimensional accuracy and surface finish of the inner hole or end face. Therefore, the high-speed rotating grinding wheel, as the grinding head of the internal grinding machine, directly contacts the inner hole or end face of the workpiece. After a period of use, it will wear out, so the grinding head needs to be replaced frequently to maintain the normal operation of the internal grinding machine. Currently, the mounting structure of the grinding head of existing internal grinding machines on the market, such as the precision bearing machining internal grinding machine disclosed in patent CN215239744U which facilitates the replacement of a tight grinding head, has a threaded tube fixed at one end of the rotating shaft. A metal retaining ring is fitted on the outer wall of the threaded tube, and the inner wall of the metal retaining ring is threaded to one end of the outer wall of the threaded tube. At the same time, a screw is provided at one end of the metal grinding head, and the screw is inserted through the inner wall of the threaded tube. The outer wall of the screw is threaded to the inner wall of the threaded tube, and one end of the inner wall of the metal retaining ring is also threaded to one end of the outer wall of the metal grinding head. That is, the metal grinding head is fixedly installed through the threaded connection of the screw and the threaded tube, and the two ends of the metal retaining ring are respectively threaded to the threaded tube and one end of the outer wall of the metal grinding head. When it is necessary to replace the metal grinding head, the metal retaining ring can be rotated directly, and the metal grinding head can be removed from the threaded tube by rotating the screw. Although the grinding head of the aforementioned internal grinding machine can be quickly changed, in order to ensure that the grinding head can be kept circumferentially fixed, the threads of the screw and the metal retaining ring are opposite, and the metal retaining ring is located on the outside of the screw. That is, when changing the grinding head, the metal retaining ring needs to be loosened first, and then the screw needs to be turned in the opposite direction. This results in two turns and two turns in different directions. In addition, the metal retaining ring and the screw are different sizes, and different tools are required to turn them. This still presents the problem of inconvenience in disassembly and assembly, which affects the efficiency of grinding head replacement. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention aims to provide a quick-change structure for the grinding head of an internal grinding machine. A chuck is provided at one end of the spindle, with one end serving as a clamping end. This clamping end is cylindrical and has clamping threads on its outer side wall. Furthermore, the threaded end of the chuck has several deformation grooves penetrating its outer and inner side walls radially. The chuck thread engages with a quick-release nut, allowing the chuck end dimension to change when the quick-release nut is turned, thereby clamping the grinding head's clamping rod and achieving axial positioning of the grinding head. Additionally, a polygonal insertion hole is provided on the bottom of the cylindrical clamping end, and the end of the grinding head's clamping rod is a polygonal plug that mates with the polygonal insertion hole, achieving circumferential positioning of the grinding head and clamping rod. Disassembly and assembly only require turning the quick-release nut, eliminating the need for multiple operations, making disassembly and assembly more convenient, increasing grinding head replacement efficiency, and meeting the requirements for quick-change.

[0005] The specific technical solution is as follows:

[0006] A quick-change structure for an internal grinding machine's grinding head includes a spindle, one end of which is connected to a drive unit. A grinding head with a clamping rod is mounted on the end of the spindle opposite to the drive unit. The structure further includes a chuck and a quick-release nut. One end of the chuck is connected to one end of the spindle and they are coaxially arranged. The end of the chuck opposite to the spindle is a clamping end, which has a barrel-shaped structure. A clamping thread is provided on the outer wall of the clamping end, and the quick-release nut is threaded onto the clamping thread. Several deformation grooves penetrating the outer and inner walls are formed on the clamping end along its axial direction. The outer wall of the clamping end is conical. A polygonal insertion hole is formed at the center of the barrel bottom of the clamping end, and one end of the grinding head's clamping rod is a polygonal plug corresponding to the polygonal insertion hole.

[0007] In the aforementioned quick-change structure for the grinding head of an internal cylindrical grinding machine, the polygonal plug protrudes from the end face of one end of the clamping rod, and when projected along the axial direction of the clamping rod, the polygonal plug is located within the end face range of the clamping rod.

[0008] In the aforementioned quick-change structure for the grinding head of an internal grinding machine, a ring-shaped limiting groove is provided on the outer wall of the clamping rod, and several protruding limiting parts are provided on the inner side of the barrel opening at the clamping end, all of which are engaged in the limiting groove.

[0009] In the aforementioned quick-change structure for the grinding head of an internal cylindrical grinding machine, the size range of the limiting part protruding from the inner wall of the barrel opening at the clamping end is 1-3mm. When the quick-release nut is in the loosened state, the inner diameter of the barrel opening at the clamping end is only 3-5mm larger than the inner diameter of the clamping rod of the grinding head on one side.

[0010] In the aforementioned quick-change structure for an internal grinding machine, a chuck is provided at one end of the spindle where the grinding head is mounted, and the end of the chuck rod connected to the spindle is inserted into the chuck and clamped.

[0011] In the aforementioned quick-change structure for an internal grinding machine, a first flange is provided at the end of the spindle where the grinding head is mounted, and a second flange corresponding to the first flange is provided at the end of the chuck that is connected to the spindle.

[0012] The aforementioned quick-change structure for the grinding head of an internal cylindrical grinding machine includes a temporary limiting member provided on the clamping end and inside the polygonal socket. One side of the temporary limiting member protrudes into the polygonal socket. Furthermore, a limiting hole is provided on the outer wall of the polygonal plug. When the polygonal plug is inserted into the polygonal socket, the side of the temporary limiting member protruding into the polygonal socket is engaged in the limiting hole.

[0013] The aforementioned quick-change structure for the grinding head of an internal grinding machine includes a temporary limiting component comprising a limiting ball, a clamping spring, and a plug. A telescopic hole is radially formed on the outer wall of the clamping end. One end of the telescopic hole extends to and connects with a polygonal insertion hole. The end of the telescopic hole connecting to the polygonal insertion hole is arranged in a constricted manner. The limiting ball is slidably disposed within the telescopic hole. A plug is disposed at the end of the telescopic hole opposite to the polygonal insertion hole. The clamping spring is disposed within the telescopic hole, with one end abutting against the limiting ball and the other end abutting against the plug.

[0014] In the aforementioned quick-change structure for the grinding head of an internal cylindrical grinding machine, both the polygonal socket and the polygonal plug have a regular quadrilateral cross-section.

[0015] The positive effects of the above technical solution are:

[0016] The aforementioned quick-change structure for the grinding head of the internal grinding machine connects a chuck with a clamping end to one end of the spindle. The outer wall of the clamping end has a clamping thread and a quick-release nut. Furthermore, the outer wall of the clamping end has several axially oriented grooves arranged in a conical shape, allowing the inner diameter of the clamping end to be increased or decreased by tightening the quick-release nut. This enables the clamping rod inserted into the clamping end to be loosened or tightened. Additionally, a polygonal insertion hole is provided at the bottom of the clamping end, and a polygonal plug corresponding to the polygonal insertion hole is provided on the end face of the clamping rod. When the clamping rod is clamped by tightening the quick-release nut, the polygonal plug can be inserted into the polygonal insertion hole to achieve circumferential positioning, ensuring that the clamping end of the chuck can synchronously drive the grinding head to rotate. Moreover, when changing the grinding head, only the quick-release nut needs to be tightened, making operation more convenient, increasing replacement efficiency, and meeting the requirements for quick changes. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an embodiment of a quick-change structure for the grinding head of an internal grinding machine according to the present invention;

[0018] Figure 2This is a cross-sectional view of an embodiment of a quick-change structure for an internal grinding machine according to the present invention.

[0019] Figure 3 This is a structural diagram of the chuck rod of a quick-change structure for the grinding head of an internal cylindrical grinding machine according to this utility model.

[0020] In the attached diagram: 1. Grinding head; 11. Clamping rod; 111. Polygonal plug; 112. Limiting groove; 1111. Limiting hole; 2. Chuck rod; 21. Clamping end; 22. Second flange; 211. Deformation groove; 212. Polygonal insertion hole; 213. Limiting part; 214. Telescopic hole; 3. Quick-release nut; 4. Temporary limiting component; 41. Limiting ball; 42. Clamping spring; 43. Plug; 5. Spindle; 51. First flange. Detailed Implementation

[0021] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 3 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0022] Figure 1 This is a structural diagram of an embodiment of a quick-change structure for the grinding head of an internal grinding machine according to the present invention; Figure 2 This is a cross-sectional view of an embodiment of a quick-change structure for the grinding head of an internal grinding machine according to this utility model. Figure 1 and Figure 2 As shown, the quick-change structure for the grinding head of the internal grinding machine provided in this embodiment includes: a spindle 5, a chuck 2, and a quick-release nut 3. At this time, one end of the spindle 5 is connected to the drive host. Preferably, the drive host is a motor, and the spindle 5 and the output shaft of the motor are connected by a belt drive or gear drive to ensure that the spindle 5 can rotate smoothly. At this time, a grinding head 1 with a clamping rod 11 is installed on the end of the spindle 5 opposite to the end connected to the drive host. That is, the grinding head 1 is installed on the other end of the spindle 5 via the clamping rod 11, so that the spindle 5 can subsequently drive the grinding head 1 to rotate, meeting the requirements of internal grinding.

[0023] Figure 3 This is a structural diagram of the chuck rod of a quick-change structure for the grinding head of an internal grinding machine according to this utility model. Figures 1 to 3As shown, one end of the chuck 2 is connected to one end of the spindle 5, and the two are arranged coaxially. That is, the chuck 2 serves as an extension of the spindle 5, allowing the spindle 5 to rotate synchronously with the chuck 2, thus providing the conditions for the subsequent rotation of the grinding head 1 after it is clamped by the chuck 2. Furthermore, the end of the chuck 2 facing away from the spindle 5 is the clamping end 21, used for clamping the grinding head 1, and works in conjunction with the clamping rod 11 of the grinding head 1. At this time, the clamping end 21 has a barrel-shaped structure, making it partially hollow, providing conditions for the insertion of the clamping rod 11 of the grinding head 1. In addition, the outer wall of the clamping end 21 is provided with clamping threads, and the quick-release nut 3 is threaded onto the clamping threads of the clamping end 21, allowing the quick-release nut 3 to be turned on the clamping end 21 to adjust its position, thus providing conditions for subsequently turning the quick-release nut 3 to clamp the clamping rod 11 of the grinding head 1. In addition, the clamping end 21 has several deformation grooves 211 extending through its outer and inner walls along its axial direction. Preferably, the deformation grooves 211 are arranged in a circular array on the clamping end 21 with the axis of the clamping end 21 as the center, thus achieving a uniform distribution of the deformation grooves 211 on the clamping end 21, providing conditions for concentric clamping of the grinding head 1 in the subsequent clamping. Furthermore, the outer wall of the clamping end 21 is arranged in a conical shape, which allows the inner hole of the clamping end 21 to be enlarged or reduced when the quick-release nut 3 is turned, thereby clamping or releasing the clamping rod 11 of the grinding head 1. The entire replacement process only requires turning one quick-release nut 3, without the need for additional operations, making the operation more convenient, the replacement efficiency higher, and facilitating the rapid replacement of the grinding head 1. In addition, a polygonal insertion hole 212 is provided at the center of the bottom of the clamping end 21, and one end of the clamping rod 11 of the grinding head 1 is a polygonal plug 111 corresponding to the polygonal insertion hole 212. This allows the polygonal plug 111 of the clamping rod 11 of the grinding head 1 to be inserted into the polygonal insertion hole 212 of the clamping end 21 when the mold head is mounted on the chuck rod 2, thereby achieving circumferential positioning of the two and ensuring that when the spindle 5 drives the chuck rod 2 to rotate, the chuck rod 2 can synchronously drive the grinding head 1 to rotate, without slippage, thus ensuring the grinding effect.

[0024] Specifically, the polygonal plug 111 is a structure that protrudes from one end face of the clamping rod 11. When projected along the axial direction of the clamping rod 11, the polygonal plug 111 is located within the end face range of the clamping rod 11. This causes the end face of the clamping rod 11 to form an abutment step at the connection point of the polygonal plug 111. This allows the abutment step formed by the end face of the clamping rod 11 to abut against the bottom of the clamping end 21 when the polygonal plug 111 is subsequently inserted into the polygonal socket 212. This achieves axial positioning of the clamping rod 11. That is, it can be determined that the installation is in place when the abutment step abuts against the bottom of the clamping end 21, which further facilitates the replacement of the grinding head 1.

[0025] More specifically, a ring-shaped limiting groove 112 is also provided on the outer side wall of the clamping rod 11. That is, a ring-shaped limiting groove 112 is provided on the outer side wall of the clamping rod 11 along its circumference. At the same time, several protruding limiting parts 213 are provided on the inner side of the barrel opening of the clamping end 21. When the clamping rod 11 of the grinding head 1 is inserted into the clamping end 21 and installed in place, the limiting parts 213 are all engaged in the limiting groove 112. That is, when the barrel opening of the clamping end 21 clamps the clamping rod 11 of the grinding head 1 by tightening the quick release nut 3, the limiting parts 213 can be squeezed into the limiting groove 112. At this time, the axial movement of the clamping rod 11 is further restricted by the mutual cooperation of the limiting parts 213 and the limiting groove 112, that is, to ensure that the grinding head 1 will not fall off the clamping end 21 axially, thus ensuring clamping stability.

[0026] More specifically, the protrusion of the limiting part 213 at the opening of the clamping end 21 beyond the inner wall of the opening is set to within a range of 1-3mm, preferably 1mm. This results in a smaller protrusion height of the limiting part 213, reducing its obstruction of the opening space of the clamping end 21. This allows for a larger diameter of the clamping rod 11 of the grinding head 1, leading to more stable and reliable clamping. Furthermore, when the quick-release nut 3 is in the loosened state, the inner diameter of the opening of the clamping end 21 is only 3-5mm larger on one side than the inner diameter of the clamping rod 11 of the grinding head 1. Preferably, the inner diameter is 3mm larger on one side. This ensures that the clamping rod 11 can be smoothly inserted into the clamping end 21 while maximizing the diameter of the clamping rod 11, resulting in higher structural strength and greater stability of the grinding head 1 after clamping.

[0027] More specifically, a chuck is provided at one end of the spindle 5 where the grinding head 1 is mounted. The end of the chuck 2 connected to the spindle 5 is inserted into the chuck and clamped. Preferably, the chuck is a three-jaw chuck, which allows for the assembly and disassembly of the chuck 2. This enables quick clamping of the chuck 2 when it needs to be replaced due to changing to a different model of grinding head 1, making the structure more flexible and adaptable. It is worth noting that since three-jaw chucks are a common structure on machine tools on the market, their specific structure will not be described in detail here.

[0028] In addition, this embodiment also provides another way to connect the spindle 5 and the chuck 2. In this case, a first flange 51 is provided at the end of the spindle 5 where the grinding head 1 is installed, and a second flange 22 corresponding to the first flange 51 is provided at the end of the chuck 2 where it is connected to the spindle 5. This allows the first flange 51 and the second flange 22 to be aligned and locked with screws when the chuck 2 is connected to the spindle 5, thus achieving a stable connection between the spindle 5 and the chuck 2. At the same time, it also allows the chuck 2 to be replaced according to actual processing needs, ensuring the flexibility of the structure and adapting to different processing requirements.

[0029] More specifically, a temporary limiting member 4 is provided on the clamping end 21 of the chuck 2, located within the polygonal socket 212. One side of the temporary limiting member 4 protrudes into the polygonal socket 212. Preferably, the side of the temporary limiting member 4 protruding into the polygonal socket 212 is retractable, facilitating the subsequent insertion or removal of the polygonal plug 111 into or from the polygonal socket 212, resulting in a more reasonable structural design. Furthermore, a limiting hole 1111 is provided on the outer wall of the polygonal plug 111. When the polygonal plug 111 is inserted into the polygonal socket 212, the side of the temporary limiting member 4 protruding into the polygonal socket 212 engages with the limiting hole 1111. Through the cooperation of the temporary limiting member 4 and the limiting hole 1111, the polygonal plug 111 is temporarily restricted within the polygonal socket 212, preventing the grinding head 1 from accidentally falling out when the quick-release nut 3 is not tightened, thus improving the safety of disassembly and assembly.

[0030] More specifically, the temporary limiting member 4 for temporarily restricting the polygonal plug 111 within the polygonal socket 212 includes a limiting ball 41, a clamping spring 42, and a plug 43. A telescopic hole 214 is radially formed on the outer wall of the clamping end 21 to facilitate its machining. One end of the telescopic hole 214 extends to and connects with the polygonal socket 212, providing a condition for one side of the limiting ball 41 to protrude into the polygonal socket 212. Furthermore, the end of the telescopic hole 214 connecting to the polygonal socket 212 is narrowed. The limiting ball 41 is slidably disposed within the telescopic hole 214. The narrowed end of the telescopic hole 214 blocks the limiting ball 41, preventing it from fully entering the polygonal socket 212 and failing, thus maintaining the reliability of the limiting ball 41 after installation. A plug 43 is provided at one end of the telescopic hole 214 opposite to the polygonal socket 212. A retaining spring 42 is disposed inside the telescopic hole 214, with one end abutting against the limiting ball 41 and the other end abutting against the plug 43. The retaining spring 42 provides a clamping force to the limiting ball 41 and also provides space for the retraction of the limiting ball 41. Preferably, the plug 43 is threaded into the telescopic hole 214, which facilitates the installation and removal of the plug 43. At the same time, the pressure of the retaining spring 42 against the limiting ball 41 can be adjusted by turning the plug 43, thereby adjusting the force when the polygonal plug 111 is inserted and removed from the polygonal socket 212. The structural design is more reasonable.

[0031] More specifically, the cross-sections of the polygonal socket 212 and the polygonal plug 111 are both square, which facilitates processing, reduces processing volume, and provides better circumferential limiting effect.

[0032] The quick-change structure for the grinding head of the internal grinding machine provided in this embodiment includes a spindle 5, a chuck 2, and a quick-release nut 3. A chuck 2 with a clamping end 21 is connected to one end of the spindle 5. The clamping end 21 is arranged in a barrel shape and has clamping threads on its outer side wall. Furthermore, the outer side wall of the clamping end 21 is a conical structure with several grooves 211. The quick-release nut 3 is installed in conjunction with the clamping threads, allowing the grinding head 1 to be easily changed when one end of the clamping rod 11 is inserted into the clamping end 21. The clamping rod 11 is tightened or loosened by tightening the nut. A polygonal insertion hole 212 is provided on the bottom of the barrel of the clamping end 21. A polygonal plug 111 is provided at the end of the clamping rod 11. The polygonal plug 111 can be inserted into the polygonal insertion hole 212 to achieve circumferential positioning. This can not only meet the installation requirements of the grinding head 1, but also realize the synchronous rotation of the grinding head 1 and the chuck rod 2. Moreover, when disassembling and replacing, only the quick-release nut 3 needs to be tightened. The operation is simple, the replacement efficiency is higher, and the quick-release requirement of the grinding head 1 is met.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quick-change structure for a grinding head on an internal grinding machine, comprising a spindle, one end of which is poweredly connected to a drive unit, and a grinding head with a clamping rod mounted on the end of the spindle opposite to the drive unit, characterized in that, Also includes: The grinding head comprises a chuck and a quick-release nut. One end of the chuck is connected to one end of the spindle and the two are arranged coaxially. The end of the chuck away from the spindle is the clamping end, which has a barrel-shaped structure. The outer wall of the clamping end is provided with a clamping thread, and the quick-release nut is threaded onto the clamping thread of the clamping end. The clamping end has several deformation grooves along its axial direction that penetrate its outer and inner walls. The outer wall of the clamping end is conical. A polygonal insertion hole is provided at the center of the bottom of the barrel of the clamping end, and one end of the clamping rod of the grinding head is a polygonal plug corresponding to the polygonal insertion hole.

2. The quick-change structure for the grinding head of the internal grinding machine according to claim 1, characterized in that, The polygonal plug protrudes from the end face of one end of the clamping rod, and when projected along the axial direction of the clamping rod, the polygonal plug is located within the end face range of the clamping rod.

3. The quick-change structure for the grinding head of the internal grinding machine according to claim 1, characterized in that, A ring-shaped limiting groove is provided on the outer side wall of the clamping rod, and several protruding limiting parts are provided on the inner side of the barrel opening at the clamping end, and the limiting parts are all inserted into the limiting groove.

4. The quick-change structure for the grinding head of the internal grinding machine according to claim 3, characterized in that, The size of the limiting part protruding from the inner wall of the barrel opening of the clamping end is 1-3mm. When the quick-release nut is in the loosened state, the inner diameter of the barrel opening of the clamping end is only 3-5mm larger than the inner diameter of the clamping rod of the grinding head on one side.

5. The quick-change structure for the grinding head of the internal grinding machine according to claim 1, characterized in that, The spindle is equipped with a chuck at one end where the grinding head is mounted, and the end of the chuck rod connected to the spindle is inserted into the chuck and clamped.

6. The quick-change structure for the grinding head of the internal grinding machine according to claim 1, characterized in that, The spindle has a first flange at one end where the grinding head is mounted, and a second flange corresponding to the first flange is provided at the other end where the chuck is connected to the spindle.

7. The quick-change structure for the grinding head of the internal grinding machine according to claim 1, characterized in that, A temporary limiting member is provided on the clamping end and inside the polygonal socket. One side of the temporary limiting member protrudes into the polygonal socket. A limiting hole is provided on the outer wall of the polygonal plug. When the polygonal plug is inserted into the polygonal socket, the side of the temporary limiting member protruding into the polygonal socket is engaged in the limiting hole.

8. The quick-change structure for the grinding head of the internal grinding machine according to claim 7, characterized in that, The temporary limiting component includes a limiting ball, a clamping spring, and a plug. A telescopic hole is radially formed on the outer wall of the clamping end. One end of the telescopic hole extends to and connects with the polygonal insertion hole. The end of the telescopic hole connecting to the polygonal insertion hole is arranged in a constricted manner. The limiting ball is slidably disposed in the telescopic hole. The plug is disposed at the end of the telescopic hole opposite to the polygonal insertion hole. The clamping spring is disposed in the telescopic hole, with one end abutting against the limiting ball and the other end abutting against the plug.

9. The quick-change structure for the grinding head of the internal grinding machine according to claim 1, characterized in that, Both the polygonal socket and the polygonal plug have a regular quadrilateral cross-section.

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