Grinding device

Abstract

The application relates to the technical field of medical devices, in particular to a grinding device. The grinding device comprises a tool shank assembly, a motor assembly and a tool. The tool shank assembly has an unlocking state and a locking state. When the tool shank assembly is in the unlocking state, the first abutting surface and the second abutting surface abut along the axial direction of the tool shank body to prevent the rotating assembly from rotating, and the locking surface is away from the first locking part in the axial direction of the tool shank body to release the locking of the tool and the rotating assembly. When the tool shank assembly is in the locking state, the first abutting surface and the second abutting surface are arranged at intervals along the axial direction of the tool shank body to enable the rotating assembly to rotate relative to the tool shank body, and the locking surface abuts against the first locking part to enable a part of the first locking part to be clamped into the first limiting groove and clamp the tool. The grinding device provided by the application solves the problems that the existing grinding device is complex to assemble and it is difficult to realize motor self-locking when assembly is not in place.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a grinding device. BACKGROUND

[0002] At present, sometimes bone tissue needs to be ground during surgical operation. The traditional grinding device usually includes a motor fixing assembly, a tool shank assembly and a tool. The tool is connected with the motor fixing assembly through the tool shank assembly. The tool can rotate under the driving of the motor, so as to meet the grinding requirement.

[0003] In the related art, it is difficult for the grinding device to realize self-locking of the motor in the case of assembly out of position. The motor may be damaged due to overload, which reduces the service life of the grinding device. Meanwhile, the assembly process is relatively complex. For example, the assembly of the tool is usually realized by two groups of structures, which needs to be clamped in two steps, which greatly reduces the assembly efficiency of the grinding device. SUMMARY

[0004] Therefore, it is necessary to provide a grinding device to solve the problems of complex assembly of the existing grinding device and difficulty in realizing self-locking of the motor in the case of assembly out of position.

[0005] The grinding device provided by the present application includes a tool shank assembly and a tool. The tool shank assembly includes a tool shank body and a rotating assembly. The rotating assembly is installed in the tool shank body. The rotating assembly includes a rotating shaft support, a first locking piece, a first movable piece and a first elastic piece. The tool passes through the tool shank body and is inserted into one end of the rotating shaft support. The first locking piece is movably installed on the side wall of the rotating shaft support. The first movable piece is sleeved on the outer periphery of the rotating shaft support and has a tendency to move towards the tool under the action of the first elastic piece. The outer periphery of the first movable piece movably sleeves a second movable piece. The first movable piece is provided with a first abutting surface and a locking surface. The second movable piece is provided with a second abutting surface. The outer wall of the tool is provided with a first limiting groove. The tool shank assembly has an unlocked state and a locked state. When the tool shank assembly is in the unlocked state, the first abutting surface and the second abutting surface are in abutting cooperation along the axial direction of the tool shank body. The locking surface is away from the first locking piece along the axial direction of the tool shank body. When the tool shank assembly is in the locked state, the first abutting surface and the second abutting surface are spaced apart along the axial direction of the tool shank body. The locking surface abuts against the first locking piece, so that a part of the first locking piece can be clamped into the first limiting groove and clamp the tool.

[0006] In one of the embodiments, the rotating shaft support is provided with a first assembly hole and a mounting hole, the tool is inserted into the first assembly hole, and the first locking member is movably mounted in the mounting hole; the rotating assembly further comprises a first limiting member, the first limiting member is sleeved and connected to the outer wall of the rotating shaft support, the inner wall of the first limiting member near one end of the mounting hole is spaced apart from the outer wall of the rotating shaft support, and can be stopped on one side of the first locking member along the axial direction of the mounting hole, and the distance from the inner wall of the first limiting member near one end of the mounting hole to the outer wall of the rotating shaft support is greater than the distance from the locking surface to the outer wall of the rotating shaft support, wherein, when the tool shank assembly is in the locking state, the first movable member and the first limiting member are in abutting fit along the axial direction of the tool shank body; and / or, the second limiting member is arranged in the first assembly hole, and the second limiting member can be stopped on the other side of the first locking member along the axial direction of the mounting hole, wherein the tool is provided with a avoiding hole corresponding to the second limiting member, and the second limiting member is inserted into the avoiding hole.

[0007] In one of the embodiments, the outer wall of the rotating shaft support is formed with a first step, and the tool shank assembly further comprises a second elastic member, one end of the second elastic member abuts against the second movable member to apply an action force to the second movable member in the direction away from the tool; wherein the action force applied by the second elastic member to the second movable member is greater than the action force applied by the first elastic member to the first movable member, so that in the unlocking state, the first movable member can be in abutting fit with the first step along the axial direction of the tool shank body.

[0008] In one of the embodiments, the side wall of the tool shank body is provided with a mounting groove, and the tool shank assembly further comprises a driving sleeve and a second locking member; the driving sleeve is sleeved on the outer wall of the tool shank body and can move relative to the tool shank body, the second locking member is movably mounted in the mounting groove, and one side of the second locking member along the depth direction of the mounting groove is limitingly connected with the second movable member, and the other side is limitingly connected with the driving sleeve, so that the second locking member can drive the second movable member to move along the axial direction of the tool shank body under the driving of the driving sleeve.

[0009] In one of the embodiments, the inner wall of the driving sleeve is provided with a driving sliding groove extending along the axial direction of the driving sleeve, part of the second locking member extends into the driving sliding groove, and the driving sleeve can rotate relative to the tool shank body to drive the second locking member to slide along the driving sliding groove; wherein the mounting groove is configured as a cam groove.

[0010] In one of the embodiments, the shank assembly further comprises a limiting sleeve, which is sleeved on the outer periphery of the shank body and is in limiting connection with the shank body; wherein the outer wall of the shank body is formed with a second step, and the second step and the limiting sleeve are respectively stopped at the two axial ends of the driving sleeve along the shank body.

[0011] In one of the embodiments, the outer periphery of the shank body is provided with a protruding rib extending along the axial direction of the shank body, and the inner wall of the limiting sleeve is provided with a limiting sliding groove extending along the axial direction of the limiting sleeve, the protruding rib is inserted into the limiting sliding groove to prevent the rotation of the limiting sleeve; wherein the cross-sectional area of the driving sliding groove is greater than or equal to the cross-sectional area of the protruding rib.

[0012] In one of the embodiments, the shank assembly further comprises a shank shell, which is sleeved on the outer periphery of the driving sleeve and the limiting sleeve, and the inner wall of the shank shell is provided with a driving surface; the outer wall of the driving sleeve is provided with a matching surface, and the driving surface and the matching surface are in abutting connection to enable the shank shell to drive the rotation of the driving sleeve; wherein the outer wall of the limiting sleeve is provided with a avoiding surface, and the avoiding surface and the matching surface are arranged in parallel when the shank assembly is in the unlocked state.

[0013] In one of the embodiments, the inner wall of the limiting sleeve away from the one end of the driving sleeve is provided with a blocking rib, and the shank assembly further comprises a third retaining ring and a third elastic member; the outer wall of the shank body is formed with a third step and a third retaining groove, the third retaining ring is arranged in the third retaining groove, and the two ends of the third elastic member are respectively arranged in abutting connection with the blocking rib and the third retaining ring, so that the blocking rib can be in abutting connection with the third step.

[0014] In one of the embodiments, the outer wall of the shaft support is provided with a first retaining groove, and the rotating assembly further comprises a first retaining ring, which is arranged in the first retaining groove and is in abutting connection with the first limiting member close to the cutting tool along the axial direction of the shank body.

[0015] In one of the embodiments, the shank assembly further comprises two bearings, which are respectively connected to the opposite ends of the shaft support.

[0016] In one of the embodiments, the inner wall of the shank body is provided with a second retaining groove, and the shank assembly further comprises a second retaining ring, which is arranged in the second retaining groove and is in abutting connection with the outer ring of the bearing arranged close to the opening of the shank body.

[0017] In one of the embodiments, the grinding device further comprises a motor assembly, the motor assembly comprises a motor shell, a motor body and a cable assembly, one end of the motor shell is sleeved on one end of the tool holder body and is threadedly connected with the tool holder body, the motor body is installed in the motor shell, and the cable assembly is arranged at an end of the motor shell away from the tool holder body and is plug-connected with the motor body.

[0018] Compared with the prior art, the grinding device provided by the application can only insert the tool into the rotating shaft support when assembling the tool, and then move the second movable piece to simultaneously realize the locking of the tool and the release of the rotation freedom of the rotating assembly. In addition, in the case that the tool is not locked in place, there is friction between the first movable piece and the second movable piece, which makes the rotating assembly unable to rotate, realizing the self-locking of the motor, avoiding the damage caused by the motor idling or overloading, and effectively improving the use reliability and service life of the grinding device. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 The front view of the grinding device of an embodiment provided by the application;

[0021] Figure 2 The exploded view of the grinding device of an embodiment provided by the application;

[0022] Figure 3 The cross-sectional view of the grinding device of an embodiment provided by the application in the unlocked state;

[0023] Figure 4 The cross-sectional view of the grinding device of an embodiment provided by the application in the locked state;

[0024] Figure 5 The exploded view of the tool holder assembly of an embodiment provided by the application;

[0025] Figure 6 The cross-sectional view of the tool holder assembly of an embodiment provided by the application in the unlocked state;

[0026] Figure 7 The exploded view of the rotating assembly of an embodiment provided by the application;

[0027] Figure 8A cross-sectional view of a rotating assembly of an embodiment provided in the present application in an unlocked state;

[0028] Figure 9 A cross-sectional view of a rotating assembly of an embodiment provided in the present application in a locked state;

[0029] Figure 10 A structural schematic view of a tool of an embodiment provided in the present application;

[0030] Figure 11 A cross-sectional view of a tool of an embodiment provided in the present application;

[0031] Figure 12 A front view of a tool shank body of an embodiment provided in the present application;

[0032] Figure 13 A top view of a driving sleeve of an embodiment provided in the present application;

[0033] Figure 14 A top view of a limiting sleeve of an embodiment provided in the present application;

[0034] Figure 15 A structural schematic view of a tool shank housing of an embodiment provided in the present application;

[0035] Figure 16 A bottom view of a tool shank housing of an embodiment provided in the present application;

[0036] Figure 17 A fitting schematic view of a driving sleeve of an embodiment provided in the present application in an unlocked state;

[0037] Figure 18 A fitting schematic view of a driving sleeve of an embodiment provided in the present application in a locked state;

[0038] Figure 19 An exploded view of a motor assembly of an embodiment provided in the present application;

[0039] Figure 20 A cross-sectional view of a motor assembly of an embodiment provided in the present application.

[0040] The meanings of the symbols in the figures are as follows:

[0041] 100, grinding device; 10, tool holder assembly; 11, tool holder main body; 111, second clamping groove; 112, mounting groove; 113, second step; 114, protruding rib; 115, third step; 116, third clamping groove; 12, rotating assembly; 121, rotating shaft support; 1211, first assembly hole; 1212, mounting hole; 1213, second assembly hole; 1214, first clamping groove; 1215, first step; 122, first locking member; 123, first movable member; 1231, first abutting surface; 1232, locking surface; 124, first elastic member; 125, first limiting member; 126, second limiting member; 127, first clamping ring; 128, bearing; 129, second clamping ring; 13, rotation stopping assembly; 131, second movable member; 1311, second abutting surface; 1312, second limiting groove; 132, second elastic member; 14, driving sleeve; 141, driving sliding groove; 142, matching surface; 15, second locking member; 16, limiting sleeve; 161, limiting sliding groove; 162, avoiding surface; 163, blocking rib; 17, tool holder shell; 171, driving surface; 18, third clamping ring; 19, third elastic member; 20, motor assembly; 21, motor shell; 22, motor body; 221, output shaft; 23, cable assembly; 30, tool; 31, first limiting groove; 32, avoiding hole. DETAILED DESCRIPTION

[0042] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than the embodiments described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0043] It should be noted that when an assembly is referred to as being "fixed to" or "disposed on" another assembly, it can be directly on the other assembly or there can be a middle assembly. When an assembly is referred to as being "connected to" another assembly, it can be directly connected to the other assembly or there can be a middle assembly. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the specification of the present application are for the purpose of illustration only and are not intended to be the only implementation.

[0044] Furthermore, the terms "first", "second", etc. are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicating a recited technical feature to the exclusion of the other. It is to be understood that a "first", "second", etc. feature so named can also be included in the "second", "first", etc. feature, explicitly or implicitly. In the description of the application, the meaning of "a plurality" is at least two, for example, two, three or the like, unless otherwise expressly specified and limited.

[0045] In the present application, unless otherwise expressly specified and limited, a first feature "on", "under", "above" or "over" a second feature can mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature "on", "above" or "over" the second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "under", "below" or "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0046] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more associated listed items.

[0047] Please refer to Figures 1-20 The present application provides a grinding device 100, which comprises a tool holder assembly 10, a motor assembly 20 and a tool 30, the motor assembly 20 and the tool 30 are respectively arranged at two ends of the tool holder assembly 10 along the axial direction.

[0048] Please refer to Figure 5 and Figure 6 The tool holder assembly 10 comprises a tool holder body 11, a rotating assembly 12 and a rotation-stopping assembly 13, the rotating assembly 12 is rotatably installed in the tool holder body 11, and the rotation-stopping assembly 13 is movably installed in the tool holder body 11, wherein the rotation-stopping assembly 13 can be used to prevent the rotating assembly 12 from rotating.

[0049] Further, as Figures 7-9As shown, the rotating assembly 12 comprises a rotating shaft support 121, a first locking member 122, a first movable member 123 and a first elastic member 124. The tool 30 is inserted into the rotating shaft support 121 through the tool shank body 11. The first locking member 122 is movably installed on the side wall of the rotating shaft support 121. Specifically, the rotating shaft support 121 is provided with a first assembly hole 1211 and a mounting hole 1212 at one end thereof. The mounting hole 1212 is located on the side wall of the first assembly hole 1211 and communicates with the first assembly hole 1211. The tool 30 is inserted into the first assembly hole 1211, and the first locking member 122 is movably installed in the mounting hole 1212. The rotating shaft support 121 is provided with a second assembly hole 1213 at the end away from the first assembly hole 1211. The motor assembly 20 is connected to the tool shank body 11, and the output shaft 221 of the motor assembly 20 is inserted into the second assembly hole 1213 and is rotationally fixed to the inner wall of the second assembly hole 1213, so as to drive the rotating assembly 12 to rotate. In this way, when the tool 30 is locked with the rotating assembly 12, the motor assembly 20 can drive the rotating assembly 12 and the tool 30 to rotate synchronously, so as to achieve grinding.

[0050] To achieve the locking effect of the tool 30 and the rotating assembly 12, as shown in Figure 10 and Figure 11 the first limiting groove 31 is provided on the outer wall of the tool 30 and is arranged in position corresponding to the mounting hole 1212. The locking of the tool 30 on the rotating assembly 12 is achieved by the locking cooperation between the first locking member 122 and the first limiting groove 31.

[0051] Specifically, the first movable member 123 and the first elastic member 124 are both sleeved on the outer periphery of the rotating shaft support 121. The first movable member 123 has a tendency to move towards the tool 30 under the action of the first elastic member 124, i.e. the first elastic member 124 is in a compressed state. The first movable member 123 is provided with a first abutting surface 1231 on the outer wall thereof and a locking surface 1232 on the inner wall thereof. Further, the rotation-stopping assembly 13 comprises a second movable member 131 and a second elastic member 132. The second movable member 131 is movably sleeved on the outer periphery of the first movable member 123. One end of the second elastic member 132 abuts against the second movable member 131 to apply a force to the second movable member 131 to move away from the tool 30. The second movable member 131 is provided with a second abutting surface 1311 on the inner wall thereof.

[0052] The tool shank assembly 10 has a locked state and an unlocked state.

[0053] When the tool shank assembly 10 is in the unlocked state, as shown in Figure 3As shown, the locking surface 1232 is away from the first locking part 122 in the axial direction of the shank body 11, at this time, the first locking part 122 has the freedom of movement at the mounting hole 1212 to release the locking between the tool 30 and the rotating assembly 12, when the tool 30 is installed or removed, the first locking part 122 can be moved towards the direction of the outer wall of the rotating shaft support 121 by the force applied to the first locking part 122, which is beneficial to the smooth insertion or removal of the tool 30 from the first assembly hole 1211, thereby reducing the difficulty of disassembling the tool 30. At the same time, in the locked state, the first abutting surface 1231 and the second abutting surface 1311 are in abutting cooperation in the axial direction of the shank body 11, at this time, the friction is formed between the first abutting surface 1231 and the second abutting surface 1311 due to abutting, which is greater than the torque of the motor assembly 20 applied to the rotating assembly 12, thereby being able to prevent the rotating assembly 12 from rotating, that is, the rotation of the rotating assembly 12 can be limited by the second movable part 131 before the tool 30 is locked, so as to achieve the self-locking of the motor, so that the motor cannot be idling, thereby effectively improving the service life of the product.

[0054] When the tool 30 is inserted into the first assembly hole 1211, in order to realize the locking of the tool 30 and the rotating assembly 12, the second movable part 131 can be controlled to move in the axial direction of the shank body 11, at this time, due to the elastic force of the first elastic part 124, the first movable part 123 will move synchronously with the second movable part 131, maintaining the abutting effect between the first abutting surface 1231 and the second abutting surface 1311, thereby ensuring the self-locking performance of the motor during the locking of the tool 30. When the locking surface 1232 on the first movable part 123 moves to the position of the mounting hole 1212, the locking surface 1232 will abut against the first locking part 122, so that a part of the first locking part 122 can be clamped into the first limiting groove 31 and clamp the tool 30, preventing the tool 30 from being separated from the rotating assembly 12 in the axial direction, so that the tool 30 has the tendency to rotate with the rotating assembly 12. Then, the second movable part 131 continues to move, and the first movable part 123 is limited on the rotating shaft support 121, so that the first abutting surface 1231 and the second abutting surface 1311 are away from each other, that is, when the shank assembly 10 is in the locked state, as shown, Figure 4 As shown, the first abutting surface 1231 and the second abutting surface 1311 are arranged in the axial direction of the shank body 11, at this time, the rotation freedom of the rotating assembly 12 is released, so that the rotating assembly 12 can rotate relative to the shank body 11, therefore, the tool 30 and the rotating assembly 12 can rotate at high speed under the driving of the motor.

[0055] It can be understood that the cutter 30 of the present application only needs to be inserted into the first assembly hole 1211 of the rotating shaft support 121 when assembled, and then the locking of the cutter 30 and the release of the rotation freedom of the rotating assembly 12 can be realized synchronously by controlling the movement of the second movable part 131. Moreover, in the case that the cutter 30 is not locked in place, there is friction between the first movable part 123 and the second movable part 131, which makes the rotating assembly 12 unable to rotate, realizing the self-locking of the motor, avoiding the damage caused by the motor idling or overloading, and effectively improving the use reliability and service life of the grinding device 100.

[0056] In an embodiment, as shown in Figure 8 and Figure 9 , the outer wall of the rotating shaft support 121 is formed with a first step 1215, which is used to abut with the first movable part 123 in the axial direction to realize the limiting of the first movable part 123.

[0057] Further, in order to improve the operation convenience in the unlocked state, the force applied by the second elastic part 132 to the second movable part 131 can be greater than the force applied by the first elastic part 124 to the first movable part 123, so that in the unlocked state, the first movable part 123 can abut with the first step 1215 in the axial direction of the shank body 11. In this way, the abutment between the first abutment surface 1231 on the first movable part 123 and the second abutment surface 1311 on the second movable part 131 in the unlocked state can be realized without additional operation, thereby realizing the motor self-locking effect and making the operation more convenient.

[0058] In order to realize the limiting of the movement of the other end of the first movable part 123, in an embodiment, as shown in Figure 9 , the rotating assembly 12 further comprises a first limiting part 125, which abuts with the first movable part 123 in the axial direction of the shank body 11 when the shank assembly 10 is in the locked state.

[0059] Specifically, the first limiting part 125 is sleeved and connected to the outer periphery of the rotating shaft support 121, and the first limiting part 125 at least partially extends to the position of the mounting hole 1212, wherein the inner wall of the end of the first limiting part 125 close to the mounting hole 1212 is spaced apart from the outer wall of the rotating shaft support 121, and can abut with one side of the first locking part 122 in the axial direction of the mounting hole 1212, thereby preventing the first locking part 122 from being detached from the opening of the end of the rotating shaft support 121, and improving the installation reliability of the first locking part 122.

[0060] The distance from the inner wall of the one end of the mounting hole 1212 close to the first limiting piece 125 to the outer wall of the rotating shaft support 121 is greater than the distance from the locking surface 1232 to the outer wall of the rotating shaft support 121. In this way, in the unlocked state, space is provided for the free movement of the first locking piece 122 at the mounting hole 1212, thereby facilitating the insertion or removal of the tool 30 into or out of the first assembly hole 1211. Here, the first locking piece 122 can be configured as a ball to further reduce the obstruction of the first locking piece 122 to the movement of the tool 30. Of course, in other embodiments, a guide surface or the like can be provided on the first locking piece 122 or the tool 30, which is not limited here.

[0061] Further, in an embodiment, the outer wall of the rotating shaft support 121 is provided with a first clamping groove 1214, and the rotating assembly 12 further includes a first clamping ring 127, which is clamped in the first clamping groove 1214 and abuts the one end of the first limiting piece 125 close to the tool 30 along the axial direction of the tool shank body 11. In this way, when the rotating assembly 12 is assembled, the first locking piece 122 can be first installed in the mounting hole 1212, then the first elastic piece 124, the first movable piece 123 and the first limiting piece 125 are successively sleeved on the outer periphery of the rotating shaft support 121, and finally the first clamping ring 127 is clamped into the first clamping groove 1214, thereby ensuring the convenience of installation of the various components on the rotating shaft support 121. Moreover, in the locked state, the first clamping ring 127 can also improve the stability of the abutment between the first limiting piece 125 and the first movable piece 123.

[0062] As shown in Figure 3 , Figure 10 and Figure 11 , the first assembly hole 1211 is provided with a second limiting piece 126 protruding from and connected to the bottom wall of the first assembly hole 1211, and the second limiting piece 126 can abut the other side of the first locking piece 122 along the axial direction of the mounting hole 1212. In this way, the first locking piece 122 can be prevented from being detached from the opening of the one end of the first assembly hole 1211 close to the inner wall of the mounting hole 1212, thereby improving the installation reliability of the first locking piece 122.

[0063] The cutter 30 is provided with an avoiding hole 32 corresponding to the second limiting member 126, and the second limiting member 126 is inserted into the avoiding hole 32. It can be understood that the shank assembly 10 of the present application can be adapted to various types of cutters 30, as long as the cutter 30 is provided with a corresponding first limiting groove 31 and avoiding hole 32, and the cutter 30 can be replaced by simple disassembly and assembly. Here, the second limiting member 126 and the avoiding hole 32 can be cylindrical to reduce the fitting difficulty, and of course, they can also be polygonal, such as rectangular, to further ensure that the cutter 30 can rotate with the rotating assembly 12. Similarly, the outer wall of the end of the cutter 30 inserted into the first assembly hole 1211 can also be polygonal to cooperate with the inner wall of the first assembly hole 1211 to stop rotation, thereby ensuring the stability of the connection between the cutter 30 and the rotating assembly 12.

[0064] In an embodiment, as shown in Figure 6 The shank assembly 10 further comprises two bearings 128, and the two bearings 128 are respectively connected to the opposite ends of the rotating shaft support 121. In this way, the rotating assembly 12 is connected to the shank body through the bearings 128, which is beneficial to reduce the rotating friction and improve the assembly coaxiality.

[0065] Specifically, the inner wall of the shank body 11 is provided with a second clamping groove 111, and the shank assembly 10 further comprises a second clamping ring 129. After the rotating assembly 12, the rotation stopping assembly 13 and the bearings 128 are installed in the shank body 11, the second clamping ring 129 is clamped in the second clamping groove 111, and the second clamping ring 129 is in abutment with the outer ring of the bearing 128 close to the opening of the shank body 11, so as to reduce the adverse effect of the rotation of the rotating assembly 12, and at the same time, the rotating assembly 12 is limited to prevent the rotating assembly 12 from being separated from the opening of the shank body 11, thereby improving the reliability of the overall structure.

[0066] In an embodiment, as shown in Figure 5 , Figure 6 and Figure 12As shown, the side wall of the shank body 11 is provided with a mounting groove 112, and the shank assembly 10 further comprises a driving sleeve 14 and a second locking member 15. The driving sleeve 14 is sleeved on the outer periphery of the shank body 11 and can move relative to the shank body 11, and the second locking member 15 is movably installed in the mounting groove 112 and is limitingly connected with the second movable member 131 on one side along the depth direction of the mounting groove 112 and is limitingly connected with the driving sleeve 14 on the other side, so that the second locking member 15 can drive the second movable member 131 to move along the axial direction of the shank body 11 under the driving of the driving sleeve 14. That is, in this embodiment, the second locking member 15 and the second movable member 131 are driven to move along the axial direction by moving the driving sleeve 14, so that the shank assembly 10 changes from the unlocked state to the locked state, which is simple to operate and can improve the operation efficiency.

[0067] Specifically, as shown in the figure, Figure 13 the inner wall of the driving sleeve 14 is provided with a driving sliding groove 141 extending along the axial direction thereof, and part of the second locking member 15 extends into the driving sliding groove 141 and is limitingly matched with the driving sliding groove 141 along the circumferential direction of the driving sleeve 14. Moreover, the driving sleeve 14 can rotate relative to the shank body 11 to drive the second locking member 15 to slide along the driving sliding groove 141. It should be understood that the mounting groove 112 is configured as a cam groove. Here, the second locking member 15 can also be configured as a ball, so as to facilitate the movement of the second locking member 15 along the mounting groove 112. It can be understood that in this way, the driving sleeve 14 can only rotate and cannot move along the axial direction, which is simple to operate and easy to control.

[0068] Among them, the outer wall of the second movable member 131 is provided with a second limiting groove 1312, and part of the second locking member 15 extends into the second limiting groove 1312 and is limitingly matched with the inner wall of the second limiting groove 1312 along the axial direction of the shank body 11. Here, the second limiting groove 1312 can be configured as an annular groove to facilitate the movement of the second locking member 15 in the second limiting groove 1312.

[0069] Further, in an embodiment, as shown in the figure, Figures 12-14 the shank assembly 10 further comprises a limiting sleeve 16, which is sleeved on the outer periphery of the shank body 11 and is limitingly connected with the shank body 11. Among them, the outer wall of the shank body 11 is formed with a second step 113, and the second step 113 and the limiting sleeve 16 are respectively stopped at the two ends of the driving sleeve 14 along the axial direction of the shank body 11, so as to further prevent the axial movement of the driving sleeve 14 and improve the reliability of the driving.

[0070] In an embodiment, as shown in the figures, Figure 15 and Figure 16As shown, the shank assembly 10 further comprises a shank shell 17 sleeved on the outer periphery of the driving sleeve 14 and the limiting sleeve 16 and connected with the shank body 11, and the inner wall of the shank shell 17 is provided with a driving surface 171. The outer wall of the driving sleeve 14 is provided with a matching surface 142, and the driving surface 171 and the matching surface 142 are in abutting cooperation to enable the shank shell 17 to drive the driving sleeve 14 to rotate. The outer wall of the limiting sleeve 16 is provided with a avoiding surface 162, and the avoiding surface 162 and the matching surface 142 are arranged in parallel when the shank assembly 10 is in the unlocked state.

[0071] When the shank shell 17 is installed, the part provided with the driving surface 171 can be inserted in alignment with the avoiding surface 162 on the limiting sleeve 16 to avoid the installation of the limiting sleeve 16 to hinder the shank shell 17. The abutting cooperation of the driving surface 171 and the matching surface 142 facilitates the rotation of the driving sleeve 14 by the shank shell 17, and as shown, Figure 17 and Figure 18 As shown, after the driving sleeve 14 rotates, the matching surface 142 will be dislocated from the avoiding surface 162, at which time the part of the shank shell 17 provided with the driving surface 171 will be stopped by the end of the limiting sleeve 16, thereby preventing the shank shell 17 from being separated axially, and the safety is higher.

[0072] To avoid the rotation of the limiting sleeve 16 due to friction and other factors, thereby increasing the risk of separation of the shank shell 17, in an embodiment, as shown, Figures 12-14 The outer periphery of the shank body 11 is provided with a protruding rib 114 extending along the axial direction thereof, the inner wall of the limiting sleeve 16 is provided with a limiting sliding groove 161 extending along the axial direction thereof, and the protruding rib 114 is inserted into the limiting sliding groove 161 to prevent the rotation of the limiting sleeve 16. The cross-sectional area of the driving sliding groove 141 is greater than or equal to the cross-sectional area of the protruding rib 114.

[0073] In an embodiment, as shown, Figure 6 and Figure 15 The inner wall of the end of the limiting sleeve 16 away from the driving sleeve 14 is provided with a blocking rib 163, and the shank assembly 10 further comprises a third clamping ring 18 and a third elastic member 19. The outer wall of the shank body 11 is formed with a third step 115 and a third clamping groove 116, the third clamping ring 18 is clamped in the third clamping groove 116, and the two ends of the third elastic member 19 are respectively abutted against the blocking rib 163 and the third clamping ring 18, so that the blocking rib 163 can be in abutting cooperation with the third step 115.

[0074] In the installation of the driving sleeve 14 and the limiting sleeve 16, the driving slot 141 on the driving sleeve 14 is first inserted to the convex rib 114 to achieve the assembly of the driving sleeve 14, and then the limiting slot 161 on the limiting sleeve 16 is inserted to the convex rib 114 to achieve the assembly of the limiting sleeve 16. After the third elastic member 19 is installed, the third collar 18 is clamped into the third clamping groove 116 to ensure the stable abutment between the blocking rib 163 and the third step 115, and the overall installation is convenient and easy to operate.

[0075] It should be noted that the driving sleeve 14 is separated from the convex rib 114 after the assembly is completed, thereby having the freedom of rotation in the circumferential direction, so that the driving sleeve 14 can be rotated under the driving of the shank shell 17. Moreover, through the abutment of the blocking rib 163 on the limiting sleeve 16 and the third step 115, the end surface of the limiting sleeve 16 and the end surface of the driving sleeve 14 are gap-fitted, so as to reduce the friction between the limiting sleeve 16 and the driving sleeve 14, thereby facilitating the rotation of the driving sleeve 14.

[0076] In an embodiment, as shown in Figure 19 and Figure 20 The motor assembly 20 includes a motor shell 21, one end of the motor shell 21 is sleeved on one end of the shank body 11 and is threadedly connected with the shank body 11. Since the thread connection is a circumferential rotation locking, and the tool 30 is also locked by the circumferential rotation of the shank shell 17. Therefore, in the present application, after the tool 30 is inserted into the first assembly hole 1211 and the output shaft 221 of the motor assembly 20 is inserted into the second assembly hole 1213, the shank shell 17 is rotated, so that the connection of the shank assembly 10, the tool 30 and the motor assembly 20 can be achieved in one step, the operation is more simple, and the assembly efficiency of the grinding device 100 is greatly improved.

[0077] Here, the outer wall of the output shaft 221 of the motor assembly 20 and the inner wall of the second assembly hole 1213 can be correspondingly provided with planes, and the rotation of the output shaft 221 and the second assembly hole 1213 is achieved by the abutment between the planes, so as to ensure that the motor assembly 20 can smoothly drive the rotating assembly 12 and the tool 30 to rotate at high speed in the locked state. Moreover, through the positioning connection of the thread and the output shaft 221, the compatibility problem of the motor assembly 20 with different shank assemblies 10 can be solved.

[0078] Further, the motor assembly 20 further includes a motor body 22 and a cable assembly 23, the motor body 22 is installed in the motor shell 21, and the cable assembly 23 is arranged at one end of the motor shell 21 away from the shank body 11 and is connected with the motor body 22. The output shaft 221 of the motor assembly 20 is located on the motor body 22.

[0079] When the motor assembly 20 is assembled, the cable assembly 23 can be first fixed with the wire core on the motor body 22, then the motor body 22 is inserted into the motor shell 21, and the connection between the motor body 22 and the motor shell 21 is realized through fasteners or the like.

[0080] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist in contradiction, they should be considered within the scope of the present disclosure.

[0081] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A grinding device, characterized by The utility model provides a tool handle assembly (10) and a tool (30), the tool handle assembly (10) includes tool handle body (11) and rotating assembly (12); The rotating assembly (12) is installed in the tool handle body (11), the rotating assembly (12) includes shaft support (121), first locking part (122), first movable part (123) and first elastic part (124), the tool (30) is inserted into one end of the shaft support (121) and is inserted into the tool handle body (11), the first locking part (122) is movably installed on the side wall of the shaft support (121), the first movable part (123) is sleeved on the outer periphery of the shaft support (121), and the first movable part (123) has the tendency of moving towards the direction close to the tool (30) under the action of the first elastic part (124), the outer periphery of the first movable part (123) movably sleeves the second movable part (131), wherein the first movable part (123) is provided with the first abutting surface (1231) and the locking surface (1232), the second movable part (131) is provided with the second abutting surface (1311), and the outer wall of the tool (30) is provided with the first limiting groove (31); The tool handle assembly (10) has an unlocked state and a locked state; When the tool handle assembly (10) is in the unlocked state, the first abutting surface (1231) and the second abutting surface (1311) are in abutting cooperation in the axial direction of the tool handle body (11), and the locking surface (1232) is away from the first locking part (122) in the axial direction of the tool handle body (11); When the tool handle assembly (10) is in the locked state, the first abutting surface (1231) and the second abutting surface (1311) are arranged at intervals in the axial direction of the tool handle body (11), and the locking surface (1232) is arranged on the first locking part (122), so that a part of the first locking part (122) can be clamped into the first limiting groove (31) and clamp the tool (30); The outer wall of the shaft support (121) is formed with a first step (1215), and the tool handle assembly (10) further comprises a second elastic part (132), one end of the second elastic part (132) abuts against the second movable part (131) to apply a force to the second movable part (131) in the direction away from the tool (30); wherein the force applied by the second elastic part (132) to the second movable part (131) is greater than the force applied by the first elastic part (124) to the first movable part (123), so that in the unlocked state, the first movable part (123) can be in abutting cooperation with the first step (1215) in the axial direction of the tool handle body (11).

2. The grinding device according to claim 1, characterized in that The shaft support (121) is provided with a first assembly hole (1211) and a mounting hole (1212), the tool (30) is inserted into the first assembly hole (1211), and the first locking part (122) is movably installed in the mounting hole (1212). The rotating assembly (12) further comprises a first limiting member (125) sleeved and connected to the outer periphery of the rotating shaft support (121), the inner wall of the first limiting member (125) near one end of the mounting hole (1212) is arranged in a spaced manner with the outer wall of the rotating shaft support (121), and the first limiting member (125) can be stopped on one side of the first locking member (122) along the axial direction of the mounting hole (1212), and the distance from the inner wall of the first limiting member (125) near one end of the mounting hole (1212) to the outer wall of the rotating shaft support (121) is greater than the distance from the locking surface (1232) to the outer wall of the rotating shaft support (121), wherein when the tool shank assembly (10) is in the locked state, the first movable member (123) and the first limiting member (125) are in abutting fit along the axial direction of the tool shank body (11); And / or, the first assembly hole (1211) is provided with a second limiting member (126), and the second limiting member (126) can be stopped on the other side of the first locking member (122) along the axial direction of the mounting hole (1212), wherein the tool (30) is provided with a relief hole (32) corresponding to the second limiting member (126), and the second limiting member (126) is inserted into the relief hole (32).

3. The grinding device of claim 1, wherein The side wall of the tool shank body (11) is provided with a mounting groove (112), and the tool shank assembly (10) further comprises a driving sleeve (14) and a second locking member (15); The driving sleeve (14) is sleeved on the outer periphery of the tool shank body (11) and can move relative to the tool shank body (11), the second locking member (15) is movably installed in the mounting groove (112), and one side of the second locking member (15) along the depth direction of the mounting groove (112) is limitingly connected with the second movable member (131), and the other side is limitingly connected with the driving sleeve (14), so that the second locking member (15) can drive the second movable member (131) to move along the axial direction of the tool shank body (11) under the driving of the driving sleeve (14).

4. The grinding device of claim 3, wherein The inner wall of the driving sleeve (14) is provided with a driving sliding groove (141) extending along the axial direction thereof, part of the second locking member (15) extends into the driving sliding groove (141), and the driving sleeve (14) can rotate relative to the tool shank body (11) to drive the second locking member (15) to slide along the driving sliding groove (141); wherein the mounting groove (112) is configured as a cam groove.

5. The grinding device of claim 4, wherein The tool shank assembly (10) further comprises a limiting sleeve (16) sleeved on the outer periphery of the tool shank body (11) and limitingly connected with the tool shank body (11); Wherein, the outer wall of the tool shank body (11) is formed with a second step (113), and the second step (113) and the limiting sleeve (16) are respectively stopped at both ends of the driving sleeve (14) along the axial direction of the tool shank body (11).

6. The grinding device of claim 5, wherein The outer periphery of the shank body (11) is provided with a protruding rib (114) extending along the axial direction of the shank body (11), and the inner wall of the limiting sleeve (16) is provided with a limiting sliding groove (161) extending along the axial direction of the limiting sleeve (16), the protruding rib (114) is inserted into the limiting sliding groove (161) to prevent the rotation of the limiting sleeve (16). The cross-sectional area of the driving sliding groove (141) is greater than or equal to the cross-sectional area of the protruding rib (114).

7. The grinding device of claim 5, wherein The shank assembly (10) further comprises a shank shell (17) sleeved on the outer periphery of the driving sleeve (14) and the limiting sleeve (16), and the inner wall of the shank shell (17) is provided with a driving surface (171). The outer wall of the driving sleeve (14) is provided with a matching surface (142), the driving surface (171) and the matching surface (142) are in abutting engagement, so that the shank shell (17) can drive the rotation of the driving sleeve (14). The outer wall of the limiting sleeve (16) is provided with a avoiding surface (162), and the avoiding surface (162) and the matching surface (142) are arranged in parallel when the shank assembly (10) is in the unlocked state.

8. The grinding device of claim 5, wherein, The inner wall of the end of the limiting sleeve (16) away from the driving sleeve (14) is provided with a blocking rib (163), and the shank assembly (10) further comprises a third clamping ring (18) and a third elastic member (19). The outer wall of the shank body (11) is formed with a third step (115) and a third clamping groove (116), the third clamping ring (18) is clamped in the third clamping groove (116), and the two ends of the third elastic member (19) are respectively abutted against the blocking rib (163) and the third clamping ring (18), so that the blocking rib (163) can be in abutting engagement with the third step (115).

9. The grinding device of claim 2, wherein, The outer wall of the shaft support (121) is provided with a first clamping groove (1214), and the rotating assembly (12) further comprises a first clamping ring (127), the first clamping ring (127) is clamped in the first clamping groove (1214) and abuts against the first limiting member (125) close to the cutting tool (30) along the axial direction of the shank body (11).

10. The grinding device of claim 1, wherein, The shank assembly (10) further comprises two bearings (128), and the two bearings (128) are respectively connected to the opposite ends of the shaft support (121).

11. The grinding device of claim 10, wherein The inner wall of the shank body (11) is provided with a second clamping groove (111), and the shank assembly (10) further comprises a second clamping ring (129), the second clamping ring (129) is clamped in the second clamping groove (111), and the second clamping ring (129) abuts against the outer ring of the bearing (128) close to the opening of the shank body (11).

12. The grinding device of claim 1, wherein, The grinding device further comprises a motor assembly (20), the motor assembly (20) comprising a motor shell (21), a motor body (22) and a cable assembly (23), one end of the motor shell (21) being sleeved on one end of the tool holder main body (11) and being threadedly connected with the tool holder main body (11), the motor body (22) being installed in the motor shell (21), and the cable assembly (23) being arranged at an end of the motor shell (21) away from the tool holder main body (11) and being plug-connected with the motor body (22).

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