Rotating shaft structure for mill

Abstract

The rotating shaft structure comprises a shaft rod and a shaft sleeve and further comprises a shaft shell, a first clamping piece, a second clamping piece and a third clamping piece, one end of the shaft rod is connected with the shaft sleeve, the other end of the shaft rod is connected with the third clamping piece, and the end, away from the shaft rod, of the third clamping piece is provided with a clamping opening capable of being opened and closed; two bearings are arranged in the shaft shell, the first clamping piece is installed in the two bearings, and the two ends of the first clamping piece penetrate through the two ends of the shaft shell. A positioning ring and a spring are further arranged in the shaft shell, the first clamping piece is sleeved with the positioning ring and the spring, the spring is pressed between the positioning ring and the bearing close to the shaft rod, and the spring abuts against the second clamping piece through the positioning ring and the first clamping piece, so that the second clamping piece closes a clamping opening of the third clamping piece. According to the rotating shaft structure for the grinding machine, the grinding rod can be conveniently replaced when the rotating shaft structure is used, user operation is convenient and fast, and the use experience of a user is improved.

Description

Technical Field

[0001] The invention relates to the technical field of grinders, in particular to a rotating shaft structure for a grinder. Background Art

[0002] As people's living standards improve, handheld nail grinders are popular among women and pet lovers as a small household appliance. Handheld nail grinders are divided into wired and wireless types, of which wireless nail grinders are powered by batteries. The main structure of the nail grinder includes a shell, a power supply module, a control module, a brushless motor, a shaft structure, a grinding rod, etc. Its working principle is that the grinding rod is connected to the shaft structure, the shaft structure is connected to the brushless motor, the power supply module supplies power to the brushless motor, the control module controls the start and stop and speed of the brushless motor, and the brushless motor drives the shaft structure and the grinding rod to rotate to achieve the grinding function.

[0003] Grinding rods need to be replaced frequently for two main reasons: first, the grinding rods will wear out with use, reducing the grinding effect; second, grinding rods of different structures and specifications have different application ranges. In order to facilitate the replacement of grinding rods, facilitate user operation, and improve user experience, the applicant proposes a grinding machine shaft structure that can facilitate the replacement of grinding rods. Summary of the invention

[0004] The object of the present invention is to provide a rotating shaft structure for a grinder, which can facilitate the replacement of grinding rods, facilitate user operation, and improve user experience.

[0005] The present invention is implemented as follows: a rotating shaft structure for a grinding machine, comprising a shaft rod and a shaft sleeve, and also comprising a shaft housing, a first clamping piece, a second clamping piece and a third clamping piece, wherein one end of the shaft rod is connected to the shaft sleeve, and the other end of the shaft rod is connected to the third clamping piece, and the end of the third clamping piece away from the shaft rod has an openable and closable clamping opening; the first clamping piece is a hollow circular tube, the second clamping piece and the third clamping piece are both located in the first clamping piece, and the second clamping piece is located on the side of the third clamping piece away from the shaft rod, and the third clamping piece is located on the side of the third clamping piece away from the shaft rod. The ends of the second clamping members are sleeved on the clamping opening of the third clamping member; two bearings are arranged in the shaft housing, the first clamping member is installed in the two bearings, and the two ends of the first clamping member pass through the two ends of the shaft housing; a positioning ring and a spring are also arranged in the shaft housing, the positioning ring and the spring are both sleeved on the first clamping member, the spring is pressed between the positioning ring and the bearing close to the shaft rod, the spring presses the second clamping member through the positioning ring and the first clamping member, so that the second clamping member closes the clamping opening of the third clamping member.

[0006] Furthermore, the third clamping member includes a first circular tube portion, a second circular tube portion and a third circular tube portion which are arranged in sequence, one end of the shaft rod is inserted into the first circular tube portion and rotates synchronously with the first circular tube portion; one end of the third circular tube portion away from the first circular tube portion is a clamping opening, and a plurality of opening and closing seams are arranged on the tube wall of the clamping opening along the circumferential direction.

[0007] Furthermore, a protruding structure is provided on the outer wall of the clamping opening of the third circular tube portion, the second clamping piece is in the shape of a hollow circular tube, one end of the second clamping piece extends to the outside of the first clamping piece, the other end of the second clamping piece is sleeved on the clamping opening of the third clamping piece, and the second clamping piece has a sleeve interface with a gradually decreasing diameter at this end.

[0008] Furthermore, the first clamping member includes a first mounting circular tube portion and a second mounting circular tube portion, and the aperture of the first mounting circular tube portion is larger than the aperture of the second mounting circular tube portion; the second circular tube portion and the third circular tube portion of the third clamping member are both completely located in the first mounting circular tube portion, the outer diameter of the second circular tube portion is larger than the aperture of the second mounting circular tube portion, the length of the second circular tube portion is L1, and the distance between the second circular tube portion and the protruding structure is L2. The first clamping member and the second clamping member are fixedly connected, and the second clamping member is arranged in the first mounting circular tube portion of the first clamping member. The distance between the second clamping member and the second mounting circular tube portion is L3, and L3 satisfies the following formula: L3<L1+L2.

[0009] Furthermore, the shaft housing is opened at one end close to the shaft rod, and a threaded structure is provided on the inner wall of the end, and a shaft cover is threadedly mounted on the threaded structure, and a through hole for the first clamping member to pass through is provided in the middle of the shaft cover.

[0010] Furthermore, a through hole for the first clamping member to pass through is provided at one end of the shaft housing away from the shaft rod, and a first annular groove is provided on the outer cylindrical wall of the end, and a first rubber ring is provided in the first annular groove; a second annular groove is provided on the outer cylindrical wall of the shaft cover, and a second rubber ring is provided in the second annular groove.

[0011] Furthermore, a limiting push platform is sleeved on the outer wall of the end of the first clamping member away from the shaft rod. The limiting push platform is annular, and the outer diameter of the limiting push platform is larger than the aperture of the through hole provided on the shaft housing for the first clamping member to pass through.

[0012] Furthermore, a limiting sleeve is provided in the shaft housing. The limiting sleeve is a circular ring structure. The outer diameter of the limiting sleeve is the same as the aperture of the shaft housing. The limiting sleeve is located between two bearings. The two ends of the limiting sleeve are respectively connected to the outer rings of the two bearings.

[0013] Furthermore, a stroke cavity and a non-circular connecting hole are provided in the sleeve, and an insert rod portion adapted to the non-circular connecting hole is provided at one end of the shaft rod connected to the sleeve, and the insert rod portion of the shaft rod passes through the stroke cavity and is inserted into the non-circular connecting hole of the sleeve.

[0014] Furthermore, a limiting platform is provided on the shaft rod, a limiting piece is sleeved on the shaft rod, the limiting piece is located on a side of the limiting platform close to the plug-in rod portion, and the limiting piece is connected to the limiting platform; a shaft rod main body is provided between the plug-in rod portion and the limiting platform, a third annular groove is provided on one end of the shaft rod main body close to the plug-in rod portion, a third rubber ring is provided in the third annular groove; a fourth annular groove is provided on the inner wall of the end of the sleeve away from the shaft rod, a fourth rubber ring is provided in the fourth annular groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The grinding shaft structure provided by the present invention can conveniently replace the grinding rod during use, making the operation convenient for the user and improving the user experience.

[0017] 2. The mill shaft structure provided by the present invention provides a shaft sleeve, so that the connection between the shaft rod and the mill motor is more stable and easy to assemble. It also has the advantage of buffering vibration, so that the mill has high operating stability and low operating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 It is a front view of the present invention;

[0020] Figure 3 yes Figure 2 AA section view;

[0021] Figure 4 is a cross-sectional view of the first clamping member, the second clamping member and the third clamping member of the present invention when clamping the grinding rod;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the third clamping member of the present invention.

[0023] In the figure: 1, shaft; 101, limit platform; 102, plug-in rod; 2, shaft sleeve; 201, stroke cavity; 202, non-circular connecting through hole; 3, shaft shell; 4, first clamping member; 5, second clamping member; 6, third clamping member; 601, first circular tube; 602, second circular tube; 603, third circular tube; 604, opening and closing seam; 605, raised structure; 7, bearing; 8, positioning ring; 9, spring; 10, shaft cover; 11, first rubber ring; 12, second rubber ring; 13, limit sleeve; 14, limit push platform; 15, limit member; 16, third rubber ring; 17, fourth rubber ring; 18, grinding rod. DETAILED DESCRIPTION

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0026] like Figure 1-Figure 3As shown, a rotating shaft structure for a grinding mill includes a shaft rod 1, a sleeve 2, a shaft housing 3, a first clamp 4, a second clamp 5 and a third clamp 6. The sleeve 2 is used to connect the motor shaft and the shaft rod 1. The sleeve 2 is provided with a stroke cavity 201 and a non-circular connecting through hole 202. The stroke cavity 201 is located at one end connected to the shaft rod 1. The non-circular connecting through hole 202 can be cross-shaped, triangular, regular hexagonal, spline-shaped, etc. The end of the shaft rod 1 used for connecting to the sleeve 2 is provided with a plug-in rod portion 102 adapted to the non-circular connecting through hole. The plug-in rod portion 102 of the shaft rod 1 passes through the stroke cavity 201 and is inserted into the non-circular connecting through hole 202 of the sleeve 2 to realize the synchronous rotation of the shaft rod 1 and the sleeve 2. A limiting platform 101 is provided on the shaft 1, and a limiting member 15 is sleeved on the shaft 1. The limiting member 15 is located on the side of the limiting platform 101 close to the plug-in rod 102, and the limiting member 15 is connected to the limiting platform 101. The arrangement of the stroke chamber 201 and the limiting member 15 allows the sleeve 2 and the shaft 1 to have a certain relative activity space in the axial direction, so as to play a role in buffering vibration. The shaft body is located between the plug-in rod 102 and the limiting platform 101, and a third annular groove is provided on one end of the shaft body close to the plug-in rod 102, and a third rubber ring 16 is provided in the third annular groove. A fourth annular groove is provided on the inner wall of the sleeve 2 at one end away from the shaft 1, and a fourth rubber ring 17 is provided in the fourth annular groove. The third rubber ring 16 and the fourth rubber ring 17 have the functions of sealing and vibration reduction.

[0027] like Figure 1-Figure 3 As shown, the shaft housing 3 is provided with an opening at one end close to the shaft rod 1, and a threaded structure is provided on the inner wall of the end, and a shaft cover 10 is threadedly mounted on the threaded structure, a through hole for the first clamping member 4 to pass through is provided in the middle of the shaft cover 10, and a through hole for the first clamping member 4 to pass through is also provided at the end of the shaft housing 3 away from the shaft rod 1, and a first annular groove is provided on the outer cylindrical wall of the end, and a first rubber ring 11 is provided in the first annular groove. A second annular groove is provided on the outer cylindrical wall of the shaft cover 10, and a second rubber ring 12 is provided in the second annular groove.

[0028] like Figure 1-Figure 3As shown, one end of the shaft rod 1 is inserted into the shaft sleeve 2 and connected to the shaft sleeve 2 for synchronous rotation, and the other end of the shaft rod 1 is inserted into the third clamping member 6 and connected to synchronous rotation. The end of the third clamping member 6 away from the shaft rod 1 has an openable clamping opening, and the grinding rod 18 is installed in the clamping opening. In this way, when the motor of the grinder rotates, the shaft rod 1 is driven to rotate through the shaft sleeve 2, thereby driving the third clamping member 6 and the grinding rod 18 to rotate. Two bearings 7 and a limit sleeve 13 are arranged in the shaft housing 3. The limit sleeve 13 is a circular ring structure. The outer diameter of the limit sleeve 13 is the same as the aperture of the shaft housing 3. The limit sleeve 13 is located between the two bearings 7, and the two ends of the limit sleeve 13 are respectively connected to the outer rings of the two bearings 7. The first clamping member 4 is installed in the two bearings 7, and the two ends of the first clamping member 4 pass through the shaft housing 3 and the shaft cover 10 respectively.

[0029] like Figure 2-Figure 5 As shown, the first clamping member 4 is a hollow circular tube, the second clamping member 5 and the third clamping member 6 are both located in the first clamping member 4, and the second clamping member 5 is located on the side of the third clamping member 6 away from the shaft 1. The third clamping member 6 includes a first circular tube portion 601, a second circular tube portion 602 and a third circular tube portion 603 arranged in sequence, one end of the shaft 1 is inserted into the first circular tube portion 601, and the third circular tube portion 603 is rotated synchronously with the first circular tube portion 601 by means of fixed connection or the like. The end of the third circular tube portion 603 away from the first circular tube portion 601 is a clamping opening, and a plurality of opening and closing seams 604 are arranged on the tube wall of the clamping opening along the circumferential direction. A protruding structure 605 is provided on the outer wall of the clamping opening of the third circular tube portion 603. The second clamping member 5 is in the shape of a hollow circular tube. One end of the second clamping member 5 extends outward from the first clamping member 4. The other end of the second clamping member 5 is sleeved at the clamping opening of the third clamping member 6. The second clamping member 5 has a sleeve port with a gradually decreasing diameter at this end. The movement of the sleeve port can realize the compression and release of the protruding structure 605, thereby realizing the opening and closing of the opening and closing seam 604, that is, realizing the opening and closing of the clamping opening. The first clamping member 4 includes a first mounting circular tube portion and a second mounting circular tube portion. The aperture of the first mounting circular tube portion is larger than the aperture of the second mounting circular tube portion. The second circular tube portion 602 and the third circular tube portion 603 of the third clamping member 6 are both completely located in the first mounting circular tube portion, the outer diameter of the second circular tube portion 602 is larger than the aperture of the second mounting circular tube portion, the length of the second circular tube portion 602 is L1, the distance between the second circular tube portion 602 and the protruding structure 605 is L2, the first clamping member 4 and the second clamping member 5 are fixedly connected, the second clamping member 5 is arranged in the first mounting circular tube portion of the first clamping member 4, the distance between the second clamping member 5 and the second mounting circular tube portion is L3, and L3 satisfies the following formula: L3<L1+L2, so that the second clamping member 5 will not separate from the third circular tube portion 603 of the third clamping member 6.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, the shaft housing 3 is also provided with a positioning ring 8 and a spring 9, both of which are sleeved on the first clamping member 4, and the positioning ring 8 and the first clamping member 4 move synchronously, and the spring 9 is compressed between the positioning ring 8 and the bearing 7 close to the shaft rod 1. The spring 9 presses the second clamping member 5 through the positioning ring 8 and the first clamping member 4, so that the second clamping member 5 closes the clamping opening of the third clamping member 6 to achieve the clamping of the grinding rod 18. A limiting push platform 14 is sleeved on the outer wall of the end of the first clamping member 4 away from the shaft rod 1, and the two move synchronously. The limiting push platform 14 is annular, and the outer diameter of the limiting push platform 14 is larger than the aperture of the through hole set on the shaft housing 3 for the first clamping member 4 to pass through, so that the limiting push platform 14 will not enter the shaft housing 3. The cooperation among the limiting push platform 14, the second circular tube portion 602 and the step structure formed at the junction of the first installation circular tube portion and the second installation circular tube portion limits the movement of the first clamping member 4 in the axial direction to a certain range.

[0031] The working principle of the present invention is as follows: the grinding rod 18 is installed in the clamping opening of the third clamping member 6. When the motor of the grinder rotates, the shaft 1 is driven to rotate through the shaft sleeve 2. When the shaft 1 rotates, the third clamping member 6, the second clamping member 5 and the first clamping member 4 are driven to rotate. When the third clamping member 6 rotates, the grinding rod 18 is driven to rotate, and the nail can be polished. When replacing the grinding rod 18, the limit push platform 14 is pushed, and the limit push platform 14 drives the first clamping member 4, the second clamping member 5 and the positioning ring 8 to move, compressing the spring 9, and at the same time, the sleeve of the second clamping member 5 releases the protruding structure 605 of the third clamping member 6, so that the opening and closing seam 604 is opened, so that the grinding rod 18 can be taken out and replaced. After the grinding rod 18 is replaced, the first clamping member 4 and the limiting push platform 14 are loosened. Under the action of the spring 9, the second clamping member 5 is pressed or compressed by the positioning ring 8 and the first clamping member 4, so that the socket of the second clamping member 5 clamps the protruding structure 605 of the third clamping member 6, so that the opening and closing seam 604 is closed, and the grinding rod 18 can be clamped.

[0032] In summary, the mill shaft structure provided by the present invention can easily replace the grinding rod 18 when in use, making the user's operation convenient and improving the user's experience. The mill shaft structure provided by the present invention makes the connection between the shaft rod 1 and the mill motor more stable and easy to assemble by setting the shaft sleeve 2, and at the same time has the advantage of buffering vibration, so that the mill has high operating stability and low operating noise.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotating shaft structure for a grinding machine, comprising a shaft rod (1) and a shaft sleeve (2), characterized in that: The invention also comprises an axle housing (3), a first clamping member (4), a second clamping member (5) and a third clamping member (6); one end of the shaft rod (1) is connected to the shaft sleeve (2); the other end of the shaft rod (1) is connected to the third clamping member (6); the end of the third clamping member (6) away from the shaft rod (1) has an openable and closable clamping opening; the first clamping member (4) is in the shape of a hollow circular tube; the second clamping member (5) and the third clamping member (6) are both located in the first clamping member (4); the second clamping member (5) is located on the side of the third clamping member (6) away from the shaft rod (1); the end of the second clamping member (5) is sleeved on the clamping opening of the third clamping member (6); The shaft housing (3) is provided with two bearings (7), the first clamping member (4) is installed in the two bearings (7), and the two ends of the first clamping member (4) pass through the two ends of the shaft housing (3); the shaft housing (3) is also provided with a positioning ring (8) and a spring (9), the positioning ring (8) and the spring (9) are both sleeved on the first clamping member (4), the spring (9) is pressed between the positioning ring (8) and the bearing (7) close to the shaft rod (1), and the spring (9) presses the second clamping member (5) through the positioning ring (8) and the first clamping member (4), so that the second clamping member (5) closes the clamping opening of the third clamping member (6).

2. A mill shaft structure according to claim 1, characterized in that: The third clamping member (6) comprises a first circular tube portion (601), a second circular tube portion (602) and a third circular tube portion (603) which are arranged in sequence; one end of the shaft rod (1) is inserted into the first circular tube portion (601) and rotates synchronously with the first circular tube portion (601); one end of the third circular tube portion (603) away from the first circular tube portion (601) is a clamping opening, and a plurality of opening and closing seams (604) are arranged on the tube wall of the clamping opening along the circumferential direction.

3. A mill shaft structure according to claim 2, characterized in that: A protruding structure (605) is provided on the outer wall of the clamping opening of the third circular tube portion (603); the second clamping member (5) is in the shape of a hollow circular tube; one end of the second clamping member (5) extends to the outside of the first clamping member (4); the other end of the second clamping member (5) is sleeved on the clamping opening of the third clamping member (6); and the second clamping member (5) has a sleeve opening with a gradually decreasing diameter at this end.

4. A mill shaft structure according to claim 3, characterized in that: The first clamping member (4) comprises a first mounting circular tube portion and a second mounting circular tube portion, the aperture of the first mounting circular tube portion is larger than the aperture of the second mounting circular tube portion; the second circular tube portion (602) and the third circular tube portion (603) of the third clamping member (6) are both completely located in the first mounting circular tube portion, the outer diameter of the second circular tube portion (602) is larger than the aperture of the second mounting circular tube portion, the length of the second circular tube portion (602) is L1, and the distance between the second circular tube portion (602) and the protruding structure (605) is L2; ​​the first clamping member (4) and the second clamping member (5) are fixedly connected, the second clamping member (5) is arranged in the first mounting circular tube portion of the first clamping member (4), the distance between the second clamping member (5) and the second mounting circular tube portion is L3, and L3 satisfies the following formula: L3<L1+L2.

5. The mill shaft structure according to claim 1, characterized in that: The shaft housing (3) is opened at one end close to the shaft rod (1), and a threaded structure is provided on the inner wall of the end, and a shaft cover (10) is threadedly mounted on the threaded structure, and a through hole for the first clamping member (4) to pass through is provided in the middle of the shaft cover (10).

6. A mill shaft structure according to claim 5, characterized in that: The end of the shaft housing (3) away from the shaft rod (1) is provided with a through hole for the first clamping member (4) to pass through, and the outer cylindrical wall of the end is provided with a first annular groove, and the first annular groove is provided with a first rubber ring (11); the outer cylindrical wall of the shaft cover (10) is provided with a second annular groove, and the second rubber ring (12) is provided in the second annular groove.

7. A mill shaft structure according to claim 6, characterized in that: A limiting push platform (14) is sleeved on the outer wall of the end of the first clamping member (4) away from the shaft rod (1); the limiting push platform (14) is in a circular ring shape, and the outer diameter of the limiting push platform (14) is larger than the diameter of a through hole provided on the shaft housing (3) for the first clamping member (4) to pass through.

8. The mill shaft structure according to claim 1, characterized in that: A limiting sleeve (13) is also provided in the shaft housing (3). The limiting sleeve (13) is a circular ring structure. The outer diameter of the limiting sleeve (13) is the same as the aperture of the shaft housing (3). The limiting sleeve (13) is located between the two bearings (7). The two ends of the limiting sleeve (13) are respectively connected to the outer rings of the two bearings (7).

9. The mill shaft structure according to claim 1, characterized in that: The shaft sleeve (2) is provided with a stroke cavity (201) and a non-circular connecting through hole (202); one end of the shaft rod (1) connected to the shaft sleeve (2) is provided with a plug-in rod portion (102) adapted to the non-circular connecting through hole; the plug-in rod portion (102) of the shaft rod (1) passes through the stroke cavity (201) and is inserted into the non-circular connecting through hole (202) of the shaft sleeve (2).

10. A mill shaft structure according to claim 9, characterized in that: The shaft rod (1) is provided with a limiting platform (101), and the shaft rod (1) is sleeved with a limiting member (15), the limiting member (15) is located on a side of the limiting platform (101) close to the plug-in rod (102), and the limiting member (15) is connected to the limiting platform (101); a shaft rod main body is provided between the plug-in rod (102) and the limiting platform (101), and a third annular groove is provided on one end of the shaft rod main body close to the plug-in rod (102), and a third rubber ring (16) is provided in the third annular groove; a fourth annular groove is provided on the inner wall of the end of the sleeve (2) away from the shaft rod (1), and a fourth rubber ring (17) is provided in the fourth annular groove.

Images