Cutter locking structure, grinding handle and grinding device

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a cutter locking structure, a grinding handle and a grinding device.The cutter locking structure comprises a power output shaft, a cutter mounting hole extending in the axial direction is formed in the power output shaft, and a cutter locking hole penetrating to the outer wall of the power output shaft in the radial direction is formed in the inner wall of the cutter mounting hole; the cutter locking piece is movably arranged in the cutter locking hole and can partially enter or retreat from the cutter mounting hole along the cutter locking hole so as to lock or unlock the cutter; the sliding sleeve is sleeved outside the power output shaft in a matched and axially moving manner so as to push the cutter locking piece to enter the cutter mounting hole or avoid an exit path of the cutter locking piece exiting from the cutter mounting hole; the sliding sleeve elastic piece is used for applying acting force in the first axial direction to the sliding sleeve; the power output shaft is sleeved with the push sleeve, and the push sleeve is used for abutting against the sliding sleeve so as to apply acting force opposite to the first axial direction to the sliding sleeve; when the push sleeve pushes the sliding sleeve to axially move to avoid the retreating path, an avoiding space allowing the cutter locking piece to partially enter is formed between the inner wall of the push sleeve and the outer wall of the power output shaft, so that the cutter locking piece can retreat from the cutter mounting hole along the retreating path. The application range of the grinding handle to cutters with large diameters can be enlarged, and the locking reliability of the cutters is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, especially relates to a cutter locking structure, grinding handle and grinding device. BACKGROUND

[0002] The grinding handle is used for connecting and driving the grinding cutter to grind bone tissue, soft tissue or other applicable tissue. For the grinding handle using a steel ball to lock the cutter, a cutter installation channel is formed in the output shaft, an inner wall of the cutter installation channel is provided with a steel ball hole extending to the outer wall of the output shaft, and a sliding sleeve is sleeved on the output shaft and can move along the axial direction of the output shaft to push the steel ball into the cutter installation channel through the steel ball hole to lock the cutter or avoid the steel ball to make the steel ball exit the cutter installation channel through the steel ball hole to unlock the cutter.

[0003] In the existing grinding handle, an annular groove is formed in the inner wall of the sliding sleeve, and when the axial position of the steel ball corresponds to the annular groove, the steel ball can enter the annular groove through the steel ball hole to exit the cutter installation channel. However, the displacement of the steel ball into the annular groove in this grinding handle is necessarily smaller than the wall thickness of the sliding sleeve, and the displacement is too small. If the diameter of the cutter is large, the locking may be unreliable, and the grinding handle is not suitable for cutters with large diameters. SUMMARY

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide a cutter locking structure, a grinding handle and a grinding device to increase the application range of the grinding handle for cutters with large diameters.

[0005] To achieve the above-mentioned purposes and other related purposes, the technical scheme of the utility model is as follows:

[0006] A cutter locking structure comprises:

[0007] A power output shaft has a cutter installation hole extending in the axial direction inside, and an inner wall of the cutter installation hole is further provided with a cutter locking hole extending radially to the outer wall of the power output shaft;

[0008] A cutter locking member is movably arranged in the cutter locking hole, and the cutter locking member can partially enter or exit the cutter installation hole along the extension direction of the cutter locking hole to lock or unlock the cutter;

[0009] A sliding sleeve is cooperatively sleeved on the power output shaft, and the sliding sleeve can move along the axial direction of the power output shaft to push the cutter locking member into the cutter installation hole or avoid the cutter locking member to exit the exit path of the cutter installation hole;

[0010] A sliding sleeve elastic member is used to apply a force in the first axial direction to the sliding sleeve;

[0011] a push sleeve, the push sleeve is sleeved outside the power output shaft, and the push sleeve is used to abut against the sliding sleeve to apply an acting force opposite to the first axial direction to the sliding sleeve, when the push sleeve pushes the sliding sleeve to move axially to avoid the exit path, an avoiding space for the tool locking member to enter is formed between the inner wall of the push sleeve and the outer wall of the power output shaft, so that the tool locking member can exit the tool mounting hole along the exit path.

[0012] Optionally, the avoiding space is an annular avoiding space.

[0013] Optionally, the tool locking structure further comprises an axial limiting sleeve sleeved outside the power output shaft and inside the push sleeve, the axial limiting sleeve is located at an end of the sliding sleeve away from the sliding sleeve elastic member to limit the limit position of the sliding sleeve moving in the first axial direction; wherein the avoiding space is formed by the inner wall of the push sleeve, the outer wall of the power output shaft, and the opposite side walls of the sliding sleeve and the axial limiting sleeve, and the avoiding space changes with the distance between the sliding sleeve and the axial limiting sleeve changing when the sliding sleeve moves axially.

[0014] Optionally, the push sleeve is located at an end of the sliding sleeve away from the sliding sleeve elastic member to limit the limit position of the sliding sleeve moving in the first axial direction; wherein the avoiding space is formed by the inner wall of the push sleeve, the outer wall of the power output shaft, and the side wall of the sliding sleeve away from the sliding sleeve elastic member.

[0015] Optionally, the push sleeve is sleeved outside the power output shaft, and the avoiding space is an avoiding groove formed in the inner wall of the push sleeve, the avoiding groove extends in the axial direction of the power output shaft.

[0016] Optionally, the sliding sleeve elastic member is sleeved outside the power output shaft, and the two ends of the sliding sleeve elastic member abut against the shaft shoulder of the power output shaft and the sliding sleeve respectively.

[0017] Optionally, the tool locking structure further comprises a mounting sleeve, a lock sleeve rotatably sleeved outside the mounting sleeve, and a power transmission member, the power output shaft, the sliding sleeve, and the push sleeve are located inside the mounting sleeve, the power transmission member is matched with the lock sleeve, the mounting sleeve, and the push sleeve respectively, and the power transmission member is used to convert the circumferential rotation of the lock sleeve into the axial movement of the push sleeve.

[0018] Optionally, the inner wall of the lock sleeve is provided with a guide groove extending in the axial direction of the lock sleeve, a helical groove penetrating the wall thickness is formed on the circumferential side wall of the mounting sleeve, the helical groove is a cylindrical helical groove, a limiting ring groove is arranged on the outer circumferential wall of the push sleeve in the circumferential direction, and the power transmission member is located in the guide groove, the helical groove, and the limiting ring groove simultaneously.

[0019] Based on the same concept, the utility model also provides a grinding handle for connecting a cutter and driving the cutter to rotate, comprising the cutter locking structure as described above.

[0020] Based on the same concept, the utility model also provides a grinding device, comprising the grinding handle as described above and a cutter matched with the grinding handle, wherein an outer wall of the cutter is provided with a locking groove for embedding the cutter locking piece.

[0021] As described above, the utility model has the following beneficial effects:

[0022] By setting the push sleeve outside the power output shaft for abutting against the sliding sleeve, and forming the avoiding space for the partial entry of the cutter locking piece between the inner wall of the push sleeve and the outer wall of the power output shaft, the displacement of the cutter locking piece is increased by the avoiding space, the applicable range of the grinding handle for the cutter with larger diameter is increased, and the reliability of the cutter locking is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Part structure section view of the cutter locking structure of an embodiment of the utility model Figure 1 ;

[0024] Figure 2 Part structure section view of the cutter locking structure of an embodiment of the utility model Figure 2 (Sliding sleeve movement)

[0025] Figure 3 Part structure section view of the cutter locking structure of another embodiment of the utility model

[0026] Figure 4 Sectional view of the cutter locking structure of the embodiment of the utility model

[0027] Figure 5 Structure schematic view of the cutter locking structure of the embodiment of the utility model (remove the locking sleeve)

[0028] Figure 6 Sectional view of the power output shaft of the embodiment of the utility model Figure 1 ;

[0029] Figure 7 Sectional view of the power output shaft of the embodiment of the utility model Figure 2 (A-A direction)

[0030] Figure 8 Structure schematic view of the mounting sleeve of the embodiment of the utility model

[0031] Figure 9 Structure schematic view of the locking sleeve of the embodiment of the utility model

[0032] Figure 10 It is the cross section view of the lock sleeve of the utility model embodiment;

[0033] Figure 11 It is the structure schematic view of the push sleeve of the utility model embodiment;

[0034] Figure 12 It is the structure schematic of the cutter of the utility model embodiment Figure 1 ;

[0035] Figure 13 It is the structure schematic of the cutter of the utility model embodiment Figure 2 ;

[0036] Figure 14 It is the structure schematic view of the grinding device of the utility model embodiment.

[0037] Mark explanation

[0038] 100-grinding handle;

[0039] 11-power output shaft;111-cutter mounting hole;112-cutter locking hole;113-cutter positioning hole;

[0040] 12-sliding sleeve;

[0041] 13-push sleeve;130-avoidance space;131-limiting ring groove;

[0042] 14-axial limiting sleeve;

[0043] 15-mounting sleeve;151-spiral groove;

[0044] 16-lock sleeve;161-guiding groove;

[0045] 17-cutter locking part;18-power transmission part;19-cutter positioning part;

[0046] 20-first bearing;21-second bearing;

[0047] 22-sliding sleeve elastic part;23-push sleeve elastic part;

[0048] 24-locking screw;25-connecting screw;

[0049] 200-cutter;210-locking groove;220-power part. Specific implementation

[0050] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied by different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0051] It is understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to understand and read the content disclosed in the specification by those skilled in the art, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size does not affect the effects and purposes that the present application can produce, and should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship does not substantially change the technical content, and is also considered as the scope of the present application.

[0052] In the description of each of the following embodiments, the "axial direction" is the axial direction of the entire grinding handle; in the description of each of the following embodiments, the orientation words "distal end" and "proximal end" are relative directions, "distal end" refers to the direction of the grinding drill bit approaching the cutter along the axial direction, and "proximal end" refers to the direction of the grinding drill bit away from the cutter along the axial direction.

[0053] Please refer to Figure 1The utility model provides a tool locking structure, including: power output shaft 11, tool locking piece 17, sliding sleeve 12, sliding sleeve elastic part 22 and push sleeve 13, the power output shaft 11, inside has the tool mounting hole 111 along the axial extension, the inner wall of tool mounting hole 111 still is equipped with the tool locking hole 112 that penetrates to the outer wall of power output shaft 11 radially, tool locking piece 17 can move and be located in tool locking hole 112, tool locking piece 17 can enter or exit tool mounting hole 111 along the extension direction of tool locking hole 112 partially to lock or unlock tool 200, sliding sleeve 12 is cooperated and is set up in the power output shaft 11 outside, sliding sleeve 12 can move along the axial direction of power output shaft 11 to push the tool locking piece 17 into tool mounting hole 111 or avoid the exit path of tool locking piece 17 and exit tool mounting hole 111, sliding sleeve elastic part 22 is used to apply the force along the first axial direction to sliding sleeve 12, push sleeve 13 is set up in the power output shaft 11 outside, push sleeve 13 is used to abut with sliding sleeve 12 to apply the force opposite to the first axial direction to sliding sleeve 12, when push sleeve 13 pushes sliding sleeve 12 and moves to avoid the exit path axially, the inner wall of push sleeve 13 and the outer wall of power output shaft 11 form the avoidance space 130 for the partial entry of tool locking piece 17 to make tool locking piece 17 can exit tool mounting hole 111 along the exit path.

[0054] Specifically, the tool mounting hole 111 arranged inside the power output shaft 11 is used for accommodating the tool 200 (see Figure 12 And Figure 13 When the tool 200 is locked in the power output shaft 11, the power output shaft 11 can rotate synchronously. The tool locking hole 112 is arranged on the circumferential wall of the power output shaft 11, and the tool locking piece 17 is movably arranged in the tool locking hole 112. When the tool locking piece 17 enters the tool mounting hole 111, the tool 200 can be locked, and the tool 200 cannot be pulled out. When the tool locking piece 17 exits the tool mounting hole 111, the tool 200 is unlocked, and the tool 200 can be axially moved and freely pulled out.

[0055] In the example, two tool locking holes 112 are symmetrically arranged on the power output shaft 11 in the radial direction, the tool locking holes 112 are communicated with the tool mounting hole 111 inside the power output shaft 11, and the tool locking piece 17 is movably arranged in the tool locking hole 112.

[0056] The sliding sleeve 12 is sleeved on the power output shaft 11. When the sliding sleeve 12 moves and covers the tool locking hole 112, the tool locking member 17 is pushed into the tool mounting hole 111, and the tool 200 can be locked. When the sliding sleeve 12 moves and exposes the tool locking hole 112, the tool locking member 17 can move radially freely and unlock the tool 200, and the tool 200 can be freely inserted or removed. In this way, the opening and closing of the tool locking hole 112 can be realized by the reciprocating movement of the sliding sleeve 12, and the locking and unlocking of the tool 200 can be realized.

[0057] The sliding sleeve elastic member 22 is used to apply a force in the first axial direction to the sliding sleeve 12, and the push sleeve 13 is located at both ends of the sliding sleeve 12 respectively with the sliding sleeve elastic member 22. The push sleeve 13 is used to apply a force opposite to the first axial direction to the sliding sleeve 12. When the push sleeve 13 moves in the direction opposite to the first axial direction (away from the push sleeve 13), the sliding sleeve 12 can be pushed to move synchronously, and vice versa. When the push sleeve 13 moves in the direction of the first axial direction, the sliding sleeve 12 also moves in the first axial direction under the action of the sliding sleeve elastic member 22. In this way, the reciprocating movement of the sliding sleeve 12 can be realized by the cooperation of the push sleeve 13 and the sliding sleeve elastic member 22.

[0058] Continuing to refer to Figure 1 When the tool locking member 17 exits the tool mounting hole 111, an avoiding space 130 is formed between the inner wall of the push sleeve 13 and the outer wall of the power output shaft 11 for the tool locking member 17 to enter partially. The push sleeve 13 pushes the sliding sleeve 12 away from the tool locking hole 112 to avoid the path of the tool locking member 17 exiting the tool mounting hole 111, and the tool locking member 17 can move radially freely. Since the avoiding space 130 is formed between the inner wall of the push sleeve 13 and the outer wall of the power output shaft 11, the tool locking member 17 can enter the avoiding space 130 at least partially, thereby increasing the displacement of the tool locking member 17 by the avoiding space 130, increasing the application range of the grinding handle 100 to the tool 200 with a larger diameter, and ensuring the reliability of the locking of the tool 200.

[0059] In some embodiments, the avoiding space 130 is an annular avoiding space 130. Specifically, the avoiding space 130 is an annular avoiding space 130 formed between the outer wall of the power output shaft 11 and the inner wall of the push sleeve 13 and around the peripheral wall of the power output shaft 11.

[0060] It can be understood that the inner diameter of the sliding sleeve 12 is matched with the outer diameter of the power output shaft 11, the inner diameter of the pushing sleeve 13 has a gap with the outer diameter of the power output shaft 11, the inner diameter of the pushing sleeve 13 is greater than the inner diameter of the sliding sleeve 12 and less than the outer diameter of the sliding sleeve 12. Specifically, the inner diameter of the sliding sleeve 12 is matched with the outer diameter of the power output shaft 11, so that the sliding sleeve 12 can cover or expose the tool locking hole 112 when the sliding sleeve 12 slides on the power output shaft 11; the inner diameter of the pushing sleeve 13 has a gap with the outer diameter of the power output shaft 11, so as to form the avoiding space 130, which allows the tool locking piece 17 to move in the radial direction when the pushing sleeve 13 pushes the sliding sleeve 12 to expose the tool locking hole 112; the inner diameter of the pushing sleeve 13 is greater than the inner diameter of the sliding sleeve 12 and less than the outer diameter of the sliding sleeve 12, so that the pushing sleeve 13 can push the sliding sleeve 12 to move when the pushing sleeve 13 slides.

[0061] Referring to Figure 2 In some embodiments, the tool locking structure further comprises an axial limiting sleeve 14 sleeved on the power output shaft 11 and sleeved in the pushing sleeve 13, the axial limiting sleeve 14 is located at one end of the sliding sleeve 12 away from the sliding sleeve elastic piece 22, so as to limit the limit position of the sliding sleeve 12 moving in the first axial direction; wherein the avoiding space 130 is formed by the inner wall of the pushing sleeve 13, the outer wall of the power output shaft 11, and the opposite side walls of the sliding sleeve 12 and the axial limiting sleeve 14, and the avoiding space 130 changes with the distance between the sliding sleeve 12 and the axial limiting sleeve 14 changing when the sliding sleeve 12 moves axially. Specifically, the axial limiting sleeve 14 is fixedly sleeved on the power output shaft 11 and located between the power output shaft 11 and the pushing sleeve 13, the axial limiting sleeve 14 is located at one end of the sliding sleeve 12 away from the sliding sleeve elastic piece 22, so as to limit the limit position of the sliding sleeve 12 moving in the first axial direction, and the sliding sleeve 12 slides between the limit position of the sliding sleeve elastic piece 22 being compressed and the position of the axial limiting sleeve 14. In the natural state, the sliding sleeve 12 abuts against the axial limiting sleeve 14 under the action of the sliding sleeve elastic piece 22. The length of the axial limiting sleeve 14 in the axial direction of the power output shaft 11 is greater than the length of the pushing sleeve 13 in the axial direction of the power output shaft 11, so that the sliding sleeve 12 can abut against the axial limiting sleeve 14 without external force, and the gap is formed between the sliding sleeve 12 and the pushing sleeve 13. The avoiding space 130 is formed by the inner wall of the pushing sleeve 13, the outer wall of the power output shaft 11, and the opposite side walls of the sliding sleeve 12 and the axial limiting sleeve 14. Since the axial movement of the sliding sleeve 12 changes the distance between the sliding sleeve 12 and the axial limiting sleeve 14, the avoiding space 130 also changes with the movement of the sliding sleeve 12, so that the avoiding space 130 is a dynamic avoiding space 130. When the sliding sleeve 12 moves in the direction opposite to the first axial direction, the avoiding space 130 increases; when the sliding sleeve 12 moves in the first axial direction, the avoiding space 130 decreases.

[0062] Referring toFigure 3 In some embodiments, the push sleeve 13 is located at the end of the sliding sleeve 12 opposite to the sliding sleeve elastic member 22 to limit the limit position of the sliding sleeve 12 moving in the first axial direction; wherein the avoiding space 130 is formed by the inner wall of the push sleeve 13, the outer wall of the power output shaft 11 and the side wall of the sliding sleeve 12 opposite to the sliding sleeve elastic member 22. Specifically, under the action of the sliding sleeve elastic member 22 without external force, the sliding sleeve 12 abuts against the push sleeve 13, and the limit position of the sliding sleeve 12 moving in the first axial direction is limited by the push sleeve 13. The avoiding space 130 is formed by the inner wall of the push sleeve 13, the outer wall of the power output shaft 11 and the side wall of the sliding sleeve 12 opposite to the sliding sleeve elastic member 22, at this time, the avoiding space 130 changes with the movement of the sliding sleeve 12, so that the avoiding space 130 is a dynamic avoiding space 130. When the sliding sleeve 12 moves in the direction opposite to the first axial direction, the avoiding space 130 increases; when the sliding sleeve 12 moves in the direction of the first axial direction, the avoiding space 130 decreases.

[0063] In some embodiments, the push sleeve 13 is located at the end of the sliding sleeve 12 opposite to the sliding sleeve elastic member 22 to limit the limit position of the sliding sleeve 12 moving in the first axial direction; wherein the avoiding space 130 is formed by the inner wall of the push sleeve 13, the outer wall of the power output shaft 11 and the side wall of the sliding sleeve 12 opposite to the sliding sleeve elastic member 22. Specifically, under the action of the sliding sleeve elastic member 22 without external force, the sliding sleeve 12 abuts against the push sleeve 13, and the limit position of the sliding sleeve 12 moving in the first axial direction is limited by the push sleeve 13. The avoiding space 130 is formed by the inner wall of the push sleeve 13, the outer wall of the power output shaft 11 and the side wall of the sliding sleeve 12 opposite to the sliding sleeve elastic member 22, at this time, the avoiding space 130 changes with the movement of the sliding sleeve 12, so that the avoiding space 130 is a dynamic avoiding space 130. When the sliding sleeve 12 moves in the direction opposite to the first axial direction, the avoiding space 130 increases; when the sliding sleeve 12 moves in the direction of the first axial direction, the avoiding space 130 decreases.

[0064] Continuing to refer to Figure 1 It can be understood that the sliding sleeve elastic member 22 is sleeved on the power output shaft 11, and the two ends of the sliding sleeve elastic member 22 abut against the shaft shoulder of the power output shaft 11 and the sliding sleeve 12, respectively. Specifically, the end of the power output shaft 11 away from the tool locking hole 112 is provided with a shaft shoulder, and the end of the sliding sleeve 12 towards the sliding sleeve elastic member 22 is provided with a recessed portion, one end of the sliding sleeve elastic member 22 abuts against the shaft shoulder, and the other end of the sliding sleeve elastic member 22 is located in the recessed portion. The recessed portion can improve the installation reliability of the sliding sleeve elastic member 22.

[0065] Referring to Figure 4In the above embodiment, the tool locking structure further comprises a mounting sleeve 15, a locking sleeve 16 rotatably sleeved outside the mounting sleeve 15, and a power transmission member 18, the power output shaft 11, the sliding sleeve 12 and the push sleeve 13 are all located in the mounting sleeve 15, the power transmission member 18 cooperates with the locking sleeve 16, the mounting sleeve 15 and the push sleeve 13 respectively, and the power transmission member 18 is used for converting the circumferential rotation of the locking sleeve 16 into the axial movement of the push sleeve 13. Specifically, the power output shaft 11 is rotatably arranged in the mounting sleeve 15, the locking sleeve 16 is sleeved outside the mounting sleeve 15, the push sleeve 13 is arranged in the mounting sleeve 15, and the circumferential rotation of the locking sleeve 16 is converted into the axial movement of the push sleeve 13 through the power transmission member 18. By rotating the locking sleeve 16 in different directions, the push sleeve 13 can be moved reciprocally along the power output shaft 11, so as to realize the locking and unlocking of the tool 200. That is, when the locking sleeve 16 is rotated in a first circumferential direction, the push sleeve 13 can push the sliding sleeve 12 to move in a direction opposite to the first axial direction, so as to make the tool locking member 17 enter the tool mounting hole 111, and then realize the locking of the tool 200; when the locking sleeve 16 is rotated in a second circumferential direction (opposite to the first circumferential direction), the push sleeve 13 can move in the first axial direction, and the sliding sleeve 12 also moves in the first axial direction under the action of the sliding sleeve elastic member 22, so as to make the tool locking member 17 exit the tool mounting hole 111, and then realize the unlocking of the tool 200.

[0066] In the above embodiment, the inner wall of the locking sleeve 16 is provided with a guide groove 161 extending along the axial direction of the locking sleeve 16 (see Figure 9 and Figure 10 ), the circumferential wall of the mounting sleeve 15 is provided with a spiral groove 151 penetrating the wall thickness (see Figure 8 ), the spiral groove 151 is a cylindrical spiral groove, and the spiral groove 151 looks like an inclined groove inclined relative to the axial direction of the mounting sleeve 15; the outer circumferential wall of the push sleeve 13 is provided with a limiting ring groove 131 in the circumferential direction (see Figure 11 ), and the power transmission member 18 is located in the guide groove 161, the spiral groove 151 and the limiting ring groove 131 at the same time (see Figure 5). Specifically, the lock sleeve 16 is sleeved on the mounting sleeve 15, and the push sleeve 13 is located in the mounting sleeve 15. In this embodiment, two guide grooves 161 are symmetrically arranged on the lock sleeve 16, and the guide grooves 161 extend along the axial direction of the lock sleeve 16. The guide grooves 161 are in the shape of a circular arc along the transverse section perpendicular to the lock sleeve 16. The slot of the guide groove 161 is in communication with the inside of the lock sleeve 16, and the guide groove 161 allows the power transmission member 18 to move axially inside the lock sleeve 16. Two helical grooves 151 are also arranged on the mounting sleeve 15. When the lock sleeve 16 rotates relative to the mounting sleeve 15, the power transmission member 18 located in the helical groove 151 will gradually change along the helical path, and the rotation of the lock sleeve 16 can be converted into the axial movement of the push sleeve 13. A limiting ring groove 131 is arranged on the rear end of the push sleeve 13 in the circumferential direction, and the front end of the push sleeve 13 is close to the sliding sleeve 12. Since the helical groove 151 extends in a helical shape, when the lock sleeve 16 is rotated, the power transmission member 18 will move along the helical groove 151 with the rotation of the lock sleeve 16, and will be converted into axial movement along the mounting sleeve 15 under the action of the guide groove 161 of the mounting sleeve 15. Since the power transmission member 18 is also located in the limiting ring groove 131 of the push sleeve 13, the push sleeve 13 can be synchronously driven to move axially on the power output shaft 11. The power transmission member 18 is located in the guide groove 161, the helical groove 151 and the limiting ring groove 131 at the same time. This multiple constraint and guiding mechanism makes the locking process more accurate and reliable. Through the synergistic effect, the rotation of the lock sleeve 16 is converted into the movement of the push sleeve 13.

[0067] In addition, referring to Figure 1 and Figure 4 , the distal end and the proximal end of the power output shaft 11 are arranged in the mounting sleeve 15 through the first bearing 20 and the second bearing 21 respectively, and the sliding sleeve 12 and the push sleeve 13 are located between the first bearing 20 and the second bearing 21. Specifically, the first bearing 20 is sleeved on the distal end of the power output shaft 11, and the second bearing 21 is sleeved on the rear end of the power output shaft 11. The power output shaft 11 is rotatably connected to the mounting sleeve 15 through the first bearing 20 and the second bearing 21, which ensures the stable support and accurate positioning of the power output shaft 11 in the mounting sleeve 15.

[0068] Referring to Figure 1 , the tool locking structure further comprises a push sleeve elastic member 23, which is used to apply a force in the first axial direction to the push sleeve 13. The push sleeve elastic member 23 is sleeved on the outside of the sliding sleeve elastic member 22, and the two ends of the push sleeve elastic member 23 abut against the first bearing 20 and the push sleeve 13 respectively. In this way, the sliding sleeve elastic member 22 makes the sliding sleeve 12 always cover the tool locking hole 112 when there is no external force acting on it; the push sleeve elastic member 23 makes the push sleeve 13 always contact the outer ring of the second bearing 21 at the end away from the push sleeve elastic member 23 when there is no external force acting on it, and the push sleeve elastic member 23 and the push sleeve 13 are stationary when the power output shaft 11 rotates.

[0069] Referring to Figure 1 , Figure 6 and Figure 7 , in addition, a tool positioning hole 113 is formed in the circumferential wall of the power output shaft 11 along the radial direction thereof, the tool positioning hole 113 is in communication with the tool mounting hole 111 inside the power output shaft 11, in the present example, two tool positioning holes 113 are symmetrically arranged on the power output shaft 11, and the center lines of the two tool positioning holes 113 are perpendicular to the center lines of the two tool locking holes 112; a tool positioning member 19 is arranged in each tool positioning hole 113, and is used to abut against the power part 220 at the tail of the tool 200 when the tool 200 is inserted into the tool mounting hole 111 (see Figure 12 and Figure 13 ) The power part 220 is a flat square structure, which abuts against the power part 220 through two symmetrically arranged tool positioning members 19, which can limit the circumferential rotation of the tool 200 on one hand, and can facilitate the power output shaft 11 to transmit torque to the tool 200 on the other hand. In this way, the tool 200 is circumferentially locked by the tool positioning member 19, and the tool 200 is axially locked by the tool locking member 17, so that the tool 200 is completely locked.

[0070] Referring to Figure 4 , the grinding handle 100 further comprises a locking sleeve 24 and a connecting sleeve 25, the locking sleeve 24 is sleeved on the mounting sleeve 15 and axially abuts against the inside of the lock sleeve 16, the connecting sleeve 25 is sleeved on the mounting sleeve 15 and abuts against the rear end of the lock sleeve 16, the locking sleeve 24 and the connecting sleeve 25 jointly axially limit the lock sleeve 16. Specifically, the locking sleeve 24 is close to the front end of the mounting sleeve 15 and is threadedly connected with the mounting sleeve 15, the connecting sleeve 25 is located at the rear end of the lock sleeve 16 and is threadedly connected with the mounting sleeve 15, the locking sleeve 24 and the connecting sleeve 25 jointly limit the axial movement of the lock sleeve 16, but can allow the lock sleeve 16 to rotate around the mounting sleeve 15, which is beneficial to maintaining the predetermined position and stability of the lock sleeve 16 during installation and use, thereby ensuring the accurate operation and reliability of the medical grinding handle 100.

[0071] Based on the same concept, the utility model also provides a grinding handle 100 for connecting a tool 200 and driving the tool 200 to rotate, comprising the tool locking structure as described above. The grinding handle 100 adopting the tool locking structure described above can increase the applicable range of the grinding handle 100 for larger diameter tools 200, and ensure the reliability of the tool 200 locking.

[0072] Based on the same concept, the utility model also provides a grinding device, referring to Figure 14, including the grinding handle 100 as described above and the cutter 200 (see Figure 12 and Figure 13 ), the outer wall of the cutter 200 is provided with a locking groove 210 for embedding the cutter locking member 17. Specifically, in the present example, the locking groove 210 is an annular groove arranged around the outer periphery of the cutter 200, and when the cutter locking member 17 enters the locking groove 210, the cutter 200 is locked; when the cutter locking member 17 exits the locking groove 210, the cutter 200 is unlocked.

[0073] In summary, the cutter locking structure, the grinding handle 100 and the grinding device provided by the present application increase the displacement amount of the cutter locking member 17 by forming an avoiding space 130 between the inner wall of the push sleeve 13 and the outer wall of the power output shaft 11 for the cutter locking member 17 to partially enter, thereby increasing the applicable range of the grinding handle 100 for the cutter 200 with a larger diameter, and ensuring the reliability of the locking of the cutter 200.

[0074] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application shall still be covered by the claims of the present application.

Claims

1. A tool locking structure characterized by comprising: The utility model relates to a tool locking structure of a power output shaft, comprising: a power output shaft having a tool mounting hole extending in an axial direction inside, an inner wall of the tool mounting hole further having a tool locking hole extending radially to an outer wall of the power output shaft; a tool locking member movably arranged in the tool locking hole, the tool locking member being capable of partially entering or exiting the tool mounting hole in the extending direction of the tool locking hole to lock or unlock the tool; a sliding sleeve fitted outside the power output shaft, the sliding sleeve being capable of moving in the axial direction of the power output shaft to push the tool locking member into the tool mounting hole or to avoid the tool locking member from exiting the tool mounting hole along an exit path; a sliding sleeve elastic member for applying a force in a first axial direction to the sliding sleeve; a pushing sleeve fitted outside the power output shaft, the pushing sleeve being used to abut against the sliding sleeve to apply a force opposite to the first axial direction to the sliding sleeve, an inner wall of the pushing sleeve and an outer wall of the power output shaft forming an avoidance space for the tool locking member to partially enter when the pushing sleeve pushes the sliding sleeve to move axially to avoid the exit path, so that the tool locking member can exit the tool mounting hole along the exit path.

2. The tool locking structure according to Claim 1, characterized by The avoidance space is an annular avoidance space.

3. The tool locking structure according to claim 2, characterized by The tool locking structure further comprises an axial limiting sleeve fitted outside the power output shaft and inside the pushing sleeve, the axial limiting sleeve being located at an end of the sliding sleeve opposite to the sliding sleeve elastic member to limit the limit position of the sliding sleeve moving in the first axial direction; wherein the avoidance space is formed by the inner wall of the pushing sleeve, the outer wall of the power output shaft, and the opposite side walls of the sliding sleeve and the axial limiting sleeve, the avoidance space changing with the distance between the sliding sleeve and the axial limiting sleeve changing when the sliding sleeve moves axially.

4. The tool locking structure according to Claim 2, characterized by The pushing sleeve is located at the end of the sliding sleeve opposite to the sliding sleeve elastic member to limit the limit position of the sliding sleeve moving in the first axial direction; wherein the avoidance space is formed by the inner wall of the pushing sleeve, the outer wall of the power output shaft, and the side wall of the sliding sleeve opposite to the sliding sleeve elastic member.

5. The tool locking structure according to Claim 2, characterized by The pushing sleeve is fitted outside the power output shaft, and the avoidance space is an avoidance groove formed in the inner wall of the pushing sleeve, the avoidance groove extending in the axial direction of the power output shaft.

6. The tool locking structure according to Claim 1, wherein The sliding sleeve elastic member is fitted outside the power output shaft, and two ends of the sliding sleeve elastic member abut against the shaft shoulder of the power output shaft and the sliding sleeve respectively.

7. The tool locking structure according to Claim 1, wherein The tool locking structure further comprises a mounting sleeve, a lock sleeve rotatably fitted outside the mounting sleeve, and a power transmission member, the power output shaft, the sliding sleeve, and the pushing sleeve being located inside the mounting sleeve, the power transmission member being fitted with the lock sleeve, the mounting sleeve, and the pushing sleeve respectively, the power transmission member being used to convert the circumferential rotation of the lock sleeve into the axial movement of the pushing sleeve.

8. The tool locking structure according to Claim 7, characterized by An inner wall of the lock sleeve is provided with a guide groove extending in the axial direction of the lock sleeve, a circumferential side wall of the mounting sleeve is provided with a helical groove penetrating the wall thickness, the helical groove being a cylindrical helical groove, an outer circumferential wall of the pushing sleeve is provided with a limiting ring groove in the circumferential direction, and the power transmission member is located in the guide groove, the helical groove, and the limiting ring groove simultaneously.

9. A grinding handle for connecting a tool and driving the tool to rotate, characterized by, The tool locking structure as claimed in any one of claims 1-8.

10. A grinding device, characterized by The grinding handle as claimed in claim 9 and the tool adapted to the grinding handle, wherein the outer wall of the tool is provided with a locking groove for the tool locking piece to be embedded.

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