Grinding device for rotating shuttle of sewing machine

Abstract

The invention provides a sewing machine rotating shuttle polishing device which comprises a vibration cylinder and a bearing frame, the bearing frame is arranged in the vibration cylinder, a rotating motor is arranged at the top of the vibration cylinder, and the rotating motor is in transmission connection with the bearing frame; the bearing frame comprises a first bearing assembly and a second bearing assembly, the first bearing assembly is arranged on the upper portion of the second bearing assembly, the first bearing assembly and the second bearing assembly are each provided with a plurality of bearing bins, and the bearing bins are configured to bear a sewing machine rotating shuttle. Through the combination of the bearing frame and the vibration cylinder, each sewing machine rotating shuttle is arranged in one bearing bin, the rotating shuttles are prevented from colliding with one another during polishing, and the polishing efficiency of the rotating shuttles is greatly improved while the polishing quality of the rotating shuttles is improved.

Description

Technical Field

[0001] The invention relates to the field of sewing machine accessory grinding production, in particular to a rotary hook grinding device for sewing machines. Background Art

[0002] Sewing machines are widely used in various fields of the textile industry, especially in the garment manufacturing industry, where they are used to produce all kinds of clothing, such as shirts, trousers and skirts. By weaving in the threads with a rotary shuttle, the sewing machine tightly sews the fabric to ensure the quality and appearance of the garment. As the core component of the sewing machine, the rotary shuttle is mainly responsible for guiding the sewing process of the stitches, especially in sewing machines using lockstitch, which is particularly widely used.

[0003] The surface finish and flatness of the rotary shuttle have a decisive influence on the smooth passage of the sewing thread and the sewing quality. In the production process of the rotary shuttle, it is usually necessary to go through multiple steps of grinding, including rough grinding, fine grinding and polishing. In the fine grinding stage, a mechanical method is usually used to place multiple rotary shuttles in the grinding chamber, and use a stirring device to make the grinding medium interact with the rotary shuttle to remove the burrs on the surface of the rotary shuttle. However, when multiple rotary shuttles collide with each other during the grinding process, it will cause wear and even deformation on their surfaces, which will seriously affect the quality of the final product; and the sizes of various burrs are inconsistent, and the particle size of the selected grinding medium is also difficult to control. Burrs that are too large or too small are not easy to remove. Summary of the invention

[0004] In order to overcome some of the problems mentioned in the above background, the present invention provides a rotary hook grinding device for a sewing machine.

[0005] The technical solution adopted by the present invention is as follows: a rotary hook grinding device for a sewing machine, comprising a vibrating cylinder and a bearing frame, wherein the bearing frame is arranged in the vibrating cylinder, a rotating motor is arranged on the top of the vibrating cylinder, and the rotating motor is drivingly connected to the bearing frame; The carrier frame includes a first bearing assembly and a second bearing assembly, wherein the first bearing assembly is arranged on the upper part of the second bearing assembly, and the first bearing assembly and the second bearing assembly are respectively provided with a plurality of bearing bins, and the plurality of bearing bins are used to separately carry the rotary hook of the sewing machine; The first bearing assembly is provided with a first outer ring, a first connecting cross bar, a first connecting shaft and a positioning rod, the first connecting shaft is connected to the first connecting cross bar, the first connecting cross bar is connected to the first outer ring, and the positioning rod is arranged at the bottom of the first outer ring; The second bearing assembly is provided with a second positioning tube and a support ring, the second positioning tube is arranged at the upper part of the second bearing assembly, the support ring is arranged at the lower part of the second bearing assembly, the positioning rod is connected to the second positioning tube, and the support ring is connected to the vibration cylinder.

[0006] Furthermore, the vibration cylinder includes a cylinder wall and a cylinder bottom plate, a top cover is provided on the top of the cylinder wall, the rotating motor is fixedly connected to the top cover, the cylinder bottom plate is fixedly connected to the cylinder wall, a support rail and a positioning rod are provided on the cylinder bottom plate, the support rail is arranged in a ring shape, the support rail is slidably connected to the support ring, the positioning rod is arranged inside the support rail, and the positioning rod is connected to the second connecting shaft.

[0007] Further, the first outer ring is provided in plurality, and the plurality of the first outer rings are arranged in an array along the axial direction of the first connecting shaft, the first connecting cross bars are provided in plurality, and the plurality of the first connecting cross bars are arranged in an array along the radial direction of the first connecting shaft, and a plurality of first connecting vertical bars are arranged between the plurality of the first outer rings, and the plurality of the first connecting vertical bars are arranged in a one-to-one correspondence with the plurality of the first connecting cross bars; The first bearing assembly further includes a first inner ring, which is arranged inside the first outer ring, and a first bottom sealing ring is arranged between the first outer ring and the first inner ring, and the first bottom sealing ring is configured to prevent the rotary hook of the sewing machine from falling off; A plurality of first positioning tubes are provided on the top of the first outer ring, and the first positioning tubes are arranged corresponding to the positioning rods; The first connecting shaft is configured as a cavity structure.

[0008] Further, the second bearing assembly further comprises a second outer ring, a second connecting cross bar and a second connecting shaft, the second outer ring is provided in plurality, and the plurality of second outer rings are arranged in an array along the axial direction of the second connecting shaft, the second connecting cross bar is provided in plurality, and the plurality of second connecting cross bars are arranged in an array along the radial direction of the second connecting shaft, the second outer ring is connected to the second connecting cross bar, the second connecting shaft is connected to the second connecting cross bar, a plurality of second connecting vertical rods are provided between the plurality of second outer rings, and the plurality of second connecting vertical rods are arranged in a one-to-one correspondence with the plurality of second connecting cross bars; A second inner ring is provided inside the second outer ring, a second bottom sealing ring is provided between the second outer ring and the second inner ring, and the second bottom sealing ring is configured to prevent the rotary hook of the sewing machine from falling off; A connecting column is provided between the support rail and the second outer ring; The second connecting shaft is configured as a hollow structure.

[0009] Furthermore, it also includes a support frame, a shock absorber and a base, the support frame is arranged on the outside of the vibration cylinder, the shock absorber is arranged between the base and the vibration cylinder, and the bottom of the base is provided with a support foot, and the support foot is made of flexible material.

[0010] Furthermore, the shock absorbing component includes an inner rod, a connecting sleeve and a shock absorbing spring, the inner rod is slidably connected to the connecting sleeve, the inner rod and the connecting sleeve are arranged inside the shock absorbing spring, and the two ends of the shock absorbing spring are respectively fixed to the base and the bottom plate of the cylinder.

[0011] Furthermore, the support frame includes a support cross bar, and support vertical rods are respectively provided at both ends of the support cross bar. An avoidance circle is provided on the support cross bar, and the avoidance circle is arranged corresponding to the rotating motor.

[0012] Furthermore, a vibration motor and a hydraulic rod are provided at the bottom of the vibration cylinder. The hydraulic rod is fixedly connected to the supporting upright rod, the hydraulic rod is fixedly connected to the top cover, the hydraulic rod is configured to drive the top cover to move, the vibration motor is fixedly connected to the base, and the vibration motor is configured to drive the vibration cylinder to vibrate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Driven by the vibration motor, the vibration cylinder vibrates continuously, so that the abrasive sand inside can vibrate up and down, cooperating with the rotating carrier frame to achieve a better grinding effect.

[0014] Through the combination of the carrier frame and the vibration cylinder, each sewing machine hook is respectively arranged in a carrier bin to avoid collision between the hooks during grinding. While improving the grinding quality of the hook, the grinding efficiency of the hook is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a rotary hook grinding device for a sewing machine according to an embodiment of the present invention; Figure 2 It is a top view schematic diagram of a rotary hook grinding device for a sewing machine according to an embodiment of the present invention; Figure 3 for Figure 2 AA section diagram along the middle; Figure 4 for Figure 1 Schematic cross-sectional view of the middle support frame, base, shock absorber and vibration motor; Figure 5 for Figure 3 Schematic diagram of the first bearing assembly; Figure 6 for Figure 3 Schematic diagram of the second load-bearing component.

[0016] In the figure: 1. Top cover; 2. Rotating motor; 3. Support frame; 4. Hydraulic rod; 5. Vibrating cylinder; 6. Base; 7. Shock absorber; 8. First bearing assembly; 9. Second bearing assembly; 10. Vibrating motor; 31. Support cross bar; 32. Avoidance circle; 33. Support vertical bar; 51. Cylinder wall; 52. Positioning rod; 53. Support rail; 54. Cylinder bottom plate; 71. Inner rod; 72. Connecting sleeve; 73. Shock absorber spring; 61. Support foot; 8 1. First outer ring; 82. Positioning rod; 83. First inner ring; 84. First bottom ring; 85. First connecting rod; 86. First positioning tube; 87. First connecting shaft; 88. First connecting cross rod; 91. Second outer ring; 92. Second positioning tube; 93. Second inner ring; 94. Second connecting cross rod; 95. Second connecting rod; 96. Connecting column; 97. Second bottom ring; 98. Support ring; 99. Second connecting shaft. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] like Figure 1 , Figure 5 and Figure 6 As shown, in some embodiments, a device for grinding a rotary hook of a sewing machine includes a vibration cylinder 5 and a carrier, wherein the carrier is arranged inside the vibration cylinder 5, and the rotary hook of the sewing machine is installed inside the carrier. A rotary motor 2 is installed on the top of the vibration cylinder 5, and the rotary hook of the sewing machine is installed inside the carrier. The rotary motor 2 is connected to the carrier through a transmission connection, and the rotary motor 2 can drive the carrier to rotate, thereby driving the rotary hook to rotate, so that the rotary hook and the grinding sand are ground, and the fine burrs on the surface of the rotary hook are removed to ensure the surface quality of the rotary hook.

[0019] Among them, the carrier frame serves as the carrying component of the shuttle, and the carrier frame includes a first carrying component 8 and a second carrying component 9. The first carrying component 8 is connected to the second carrying component 9. The first carrying component 8 is arranged on the upper part of the second carrying component 9, and a plurality of carrying bins are respectively provided in the first carrying component 8 and the second carrying component 9, and the sewing machine shuttle is placed in these carrying bins.

[0020] Specifically, the first bearing assembly 8 includes a first outer ring 81, a first connecting crossbar 88, a first connecting shaft 87 and a positioning rod 82. The first connecting shaft 87 and the first outer ring 81 are fixedly connected by the first connecting crossbar 88. The first outer ring 81, the first connecting crossbar 88 and the first connecting shaft 87 are welded together to form a planar mesh structure. Multiple mesh structures are connected into a whole by multiple first connecting vertical rods 85, and form a bearing bin for carrying the rotary hook to be polished. It should be noted that multiple positioning rods 82 are welded and fixed at the bottom of the first outer ring 81, and the multiple positioning rods 82 are arranged in an array along the first outer ring 81.

[0021] The structure of the second bearing assembly 9 is basically the same as that of the first bearing assembly 8. The second bearing assembly 9 also includes a second outer ring 91, a second connecting crossbar 94, a second connecting shaft 99, a second positioning tube 92 and a support ring 98. The second outer ring 91 and the second connecting shaft 99 are fixedly connected by the second connecting crossbar 94. The second connecting shaft 99, the second connecting crossbar 94 and the second outer ring 91 are welded and fixedly connected to form a planar mesh structure. Multiple mesh structures are connected into a whole through multiple second connecting vertical rods 95 to form a bearing bin for carrying the rotary hook that needs to be polished. In particular, the second positioning tube 92 is arranged at the top of the second outer ring 91, which is used to connect with the positioning rod 82, and cooperates with the connection relationship between the first connecting shaft 87 and the second connecting shaft 99, so that the first bearing assembly 8 and the second bearing assembly 9 are connected into a whole to form a bearing frame.

[0022] It is worth mentioning that a support ring 98 is provided at the bottom of the second bearing assembly 9. The support ring 98 is fixedly connected to the second outer ring 91 located at the bottom through a connecting column 96, and is slidingly connected to the vibration tube 5 through the support ring 98. This design allows the second bearing assembly 9 to rotate while being supported by the support ring 98, thereby preventing the second bearing assembly 9 from shifting.

[0023] Specifically, each rotary hook is installed in the bearing bin, the second bearing assembly 9 is installed in the vibration cylinder 5, and the first bearing assembly 8 is installed on the second bearing assembly 9 through the positioning rod 82 and the second positioning tube 92. The grinding sand is introduced into the vibration cylinder 5, and the vibration cylinder 5 is sealed with the top cover 1. The output end of the rotary motor 2 is connected to the first connecting shaft 87 of the first bearing assembly 8 through the top cover 1. The rotary motor 2 drives the first bearing assembly 8 to rotate, and the second bearing assembly 9 rotates together, so that the internal rotary hook and the grinding sand are constantly rubbed to achieve the operation of grinding the rotary hook.

[0024] In particular, during grinding, driven by the vibration motor 10, the vibration cylinder 5 vibrates continuously, so that the grinding sand inside it can vibrate up and down, and cooperate with the rotating carrier frame, so as to achieve a better grinding effect.

[0025] Through the combination of the well-designed carrier frame and the vibration cylinder 5, each sewing machine hook is respectively arranged in a carrier compartment, so that collision between the hooks during grinding is avoided, and while the grinding quality of the hooks is improved, the grinding efficiency of the hooks is greatly improved.

[0026] like Figure 4 As shown, in some embodiments, the vibration cylinder 5 is used as the operating space for rotary shuttle grinding, which plays the role of supporting the carrier and loading the grinding sand. It includes a cylinder wall 51 and a cylinder bottom plate 54, and the cylinder wall 51 and the cylinder bottom plate 54 are fixed into a whole by welding. A top cover 1 is provided on the top of the cylinder wall 51, and the top cover 1 is provided with a circular through hole. The output end of the rotary motor 2 is connected to the first connecting shaft 87 through the circular through hole. The rotary motor 2 is fixedly connected to the top cover 1 by bolts, so that it can stably output rotary power.

[0027] In addition, a support rail 53 and a positioning rod 52 are provided on the cylinder bottom plate 54, wherein the support rail 53 is set to be ring-shaped, and the support rail 53 is provided with a slide groove, and the support ring 98 is slidably connected to the support rail 53 through the slide groove, so that the second bearing component 9 can rotate stably.

[0028] At the same time, the positioning rod 52 is arranged inside the support rail 53, and the positioning rod 52 is used to connect with the second connecting shaft 99, so that the positioning rod 52 can work together with the second connecting shaft 99, thereby ensuring the stability of the second bearing assembly 9.

[0029] like Figure 5 and Figure 6 As shown, in some embodiments, a plurality of first outer rings 81 are provided, and these first outer rings 81 are arranged in an array along the axial direction of the first connecting shaft 87. In addition, a plurality of first connecting cross bars 88 are provided, and these first connecting cross bars 88 are arranged in an array along the radial direction of the first connecting shaft 87. A plurality of first connecting vertical bars 85 are provided between the upper and lower first outer rings 81, and the plurality of first connecting vertical bars 85 are arranged in a one-to-one correspondence with the plurality of first connecting cross bars 88, and these components are connected by welding to form a stable structure.

[0030] A first inner ring 83 is arranged between the first outer ring 81 and the first connecting shaft 87. The first inner ring 83 divides the space between the first outer ring 81 and the first connecting shaft 87 into a plurality of segment spaces. These spaces are further divided into bearing bins by the first connecting vertical rod 85. To prevent the rotary hook from falling out of the bearing bin during grinding, a first bottom sealing ring 84 is arranged between the first outer ring 81 and the first inner ring 83 at the bottom. The bottom of the bearing bin is surrounded by the first bottom sealing ring 84 so that the gaps thereof are smaller than the rotary hook, thereby preventing the rotary hook from falling out of the bearing bin.

[0031] In particular, a plurality of first positioning tubes 86 are provided on the top of the first outer ring 81 at the upper portion. The first positioning tubes 86 are provided corresponding to the positioning rods 82 . When in use, the positioning rods 82 are installed in the second positioning tubes 92 .

[0032] It should be noted that the first connecting shaft 87 is configured as a cavity structure, and a plurality of ribs are arranged in the cavity to increase the strength of the first connecting shaft 87. The top of the first connecting shaft 87 is transmission-connected to the rotating motor 2. The bottom of the first connecting shaft 87 is provided with a connection key.

[0033] Furthermore, in some embodiments, there are also multiple second outer rings 91, which are arranged in an array along the axial direction of the second connecting shaft 99. In addition, there are multiple second connecting cross bars 94, which are arranged in an array along the radial direction of the second connecting shaft 99. A plurality of second connecting vertical bars 95 are arranged between the upper and lower second outer rings 91, and the plurality of second connecting vertical bars 95 correspond to the plurality of second connecting cross bars 94. These components are connected by welding to form a stable structure.

[0034] A second inner ring 93 is arranged between the second outer ring 91 and the first connecting shaft 87. The second inner ring 93 also divides the space between the second outer ring 91 and the second connecting shaft 99 into a plurality of annular spaces. These spaces are also divided into carrying bins by the second connecting vertical rod 95. To prevent the rotary hook from falling out of the carrying bin during grinding, a second bottom sealing ring 97 is arranged between the second outer ring 91 and the second inner ring 93 at the bottom. The bottom of the carrying bin is surrounded by the second bottom sealing ring 97 so that the gap is smaller than the rotary hook, thereby preventing the rotary hook from falling out of the carrying bin.

[0035] In addition, a connecting column 96 is specially designed between the support rail 53 and the second outer ring 91 at the bottom to ensure a tight connection between the support rail 53 and the second outer ring 91 .

[0036] It should be noted that the second connecting shaft 99 is also configured as a cavity structure, and a plurality of ribs are arranged in the cavity to increase the strength of the second connecting shaft 99. A keyway is provided at the top of the second connecting shaft 99, and the first connecting shaft 87 and the second connecting shaft 99 are connected through the mating connection between the keyway and the connecting key.

[0037] The positioning rod 52 is inserted into the bottom end of the second connecting shaft 99 to connect the second bearing assembly 9 to the cylinder bottom plate 54 .

[0038] like Figure 1-4 As shown, in some embodiments, the grinding device further includes a support frame 3, a shock absorber 7 and a base 6. Specifically, the support frame 3 is arranged on the outside of the vibration cylinder 5. The shock absorber 7 is arranged between the base 6 and the vibration cylinder 5, and its main function is to absorb and reduce the vibration generated by the vibration cylinder 5 during operation, thereby improving the running stability and service life of the entire device.

[0039] In addition, a plurality of legs 61 are provided at the bottom of the base 6, and these legs 61 are made of flexible materials to further enhance the shock absorption effect of the device. Through this design, the legs 61 can effectively absorb the impact force transmitted from the vibration cylinder 5, reduce the direct impact on the ground, and thus protect the entire device from damage.

[0040] Furthermore, in some embodiments, the shock absorbing member 7 includes an inner rod 71, a connecting sleeve 72 and a shock absorbing spring 73. Specifically, the inner rod 71 and the connecting sleeve 72 are connected by sliding so that the two can move relative to each other within a certain range. The inner rod 71 and the connecting sleeve 72 are arranged inside the shock absorbing spring 73, so that the elasticity and buffering performance of the shock absorbing spring 73 can be effectively utilized. In addition, the two ends of the shock absorbing spring 73 are respectively fixed to the base 6 and the bottom plate 54 of the cylinder, ensuring the stability and reliability of the entire shock absorbing member 7. Through this structural design, the shock absorbing spring 73 can effectively absorb and buffer the vibration and impact force generated during the grinding process of the rotary hook, thereby improving the stability and service life of the equipment.

[0041] Further, in some embodiments, the support frame 3 includes a support cross bar 31, and support vertical rods 33 are respectively provided at both ends of the support cross bar 31, so as to ensure the stability of the entire support frame 3. In addition, an avoidance circle 32 is provided on the support cross bar 31, and the purpose of designing the avoidance circle 32 is to provide a moving space for the rotating motor 2. Specifically, when the rotating motor 2 moves upward, it can pass through the avoidance circle 32, thereby increasing the moving space of the top cover 1.

[0042] Furthermore, in some embodiments, a vibration motor 10 and a hydraulic rod 4 are provided at the bottom of the vibration cylinder 5 of the grinding device. The hydraulic rod 4 is firmly connected to the support upright 33 through one end thereof, and is firmly connected to the top cover 1 at the other end. The design and configuration of the hydraulic rod 4 enable it to effectively drive the top cover 1 to move up and down. At the same time, the vibration motor 10 is fixedly mounted on the base 6, and its main function is to drive the vibration cylinder 5 to vibrate. The vibration of the vibration motor 10 enables the rotary shuttle grinding device to drive the grinding sand in the vibration cylinder 5 to vibrate up and down during operation, thereby improving the grinding quality and work efficiency.

[0043] 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 rotary hook grinding device for a sewing machine, characterized in that: It comprises a vibration cylinder (5) and a bearing frame, wherein the bearing frame is arranged in the vibration cylinder (5), a rotating motor (2) is arranged on the top of the vibration cylinder (5), and the rotating motor (2) is drivingly connected to the bearing frame; The carrier frame comprises a first carrier assembly (8) and a second carrier assembly (9), the first carrier assembly (8) being arranged on the upper part of the second carrier assembly (9), the first carrier assembly (8) and the second carrier assembly (9) being respectively provided with a plurality of carrier bins, the plurality of carrier bins being used to separately carry the rotary hooks of the sewing machine; The first bearing assembly (8) is provided with a first outer ring (81), a first connecting cross bar (88), a first connecting shaft (87) and a positioning rod (82), the first connecting shaft (87) is connected to the first connecting cross bar (88), the first connecting cross bar (88) is connected to the first outer ring (81), and the positioning rod (82) is arranged at the bottom of the first outer ring (81); The second bearing assembly (9) is provided with a second positioning tube (92) and a support ring (98); the second positioning tube (92) is arranged at the upper part of the second bearing assembly (9); the support ring (98) is arranged at the lower part of the second bearing assembly (9); the positioning rod (82) is connected to the second positioning tube (92); and the support ring (98) is connected to the vibration cylinder (5).

2. The rotary hook grinding device for a sewing machine according to claim 1, characterized in that: The vibration cylinder (5) comprises a cylinder wall (51) and a cylinder bottom plate (54); a top cover (1) is provided on the top of the cylinder wall (51); the rotating motor (2) is fixedly connected to the top cover (1); the cylinder bottom plate (54) is fixedly connected to the cylinder wall (51); a support rail (53) and a positioning lever (52) are provided on the cylinder bottom plate (54); the support rail (53) is arranged in a ring shape; the support rail (53) is slidably connected to the support ring (98); the positioning lever (52) is arranged inside the support rail (53); and the positioning lever (52) is connected to the second connecting shaft (99).

3. The rotary hook grinding device for a sewing machine according to claim 1, characterized in that: A plurality of the first outer rings (81) are provided, and the plurality of the first outer rings (81) are arranged in an array along the axial direction of the first connecting shaft (87); a plurality of the first connecting cross bars (88) are provided, and the plurality of the first connecting cross bars (88) are arranged in an array along the radial direction of the first connecting shaft (87); a plurality of first connecting vertical bars (85) are provided between the plurality of the first outer rings (81), and the plurality of the first connecting vertical bars (85) and the plurality of the first connecting cross bars (88) are arranged in a one-to-one correspondence; The first bearing assembly (8) further comprises a first inner ring (83), the first inner ring (83) being arranged inside the first outer ring (81), a first bottom sealing ring (84) being arranged between the first outer ring (81) and the first inner ring (83), the first bottom sealing ring (84) being configured to prevent the rotary hook of the sewing machine from falling off; A plurality of first positioning tubes (86) are provided on the top of the first outer ring (81), and the first positioning tubes (86) are arranged corresponding to the positioning rods (82); The first connecting shaft (87) is configured as a hollow structure.

4. The rotary hook grinding device for a sewing machine according to claim 1, characterized in that: The second bearing assembly (9) further comprises a second outer ring (91), a second connecting cross bar (94) and a second connecting shaft (99); a plurality of second outer rings (91) are provided, and the plurality of second outer rings (91) are arranged in an array along the axial direction of the second connecting shaft (99); a plurality of second connecting cross bars (94) are provided, and the plurality of second connecting cross bars (94) are arranged in an array along the radial direction of the second connecting shaft (99); the second outer ring (91) is connected to the second connecting cross bar (94); the second connecting shaft (99) is connected to the second connecting cross bar (94); a plurality of second connecting vertical bars (95) are provided between the plurality of second outer rings (91); the plurality of second connecting vertical bars (95) and the plurality of second connecting cross bars (94) are arranged in a one-to-one correspondence; A second inner ring (93) is provided inside the second outer ring (91), a second bottom sealing ring (97) is provided between the second outer ring (91) and the second inner ring (93), and the second bottom sealing ring (97) is configured to prevent the rotary hook of the sewing machine from falling off; A connecting column (96) is provided between the support rail (53) and the second outer ring (91); The second connecting shaft (99) is configured as a hollow structure.

5. The rotary hook grinding device for a sewing machine according to claim 1, characterized in that: It also comprises a support frame (3), a shock absorbing member (7) and a base (6), wherein the support frame (3) is arranged on the outside of the vibration cylinder (5), the shock absorbing member (7) is arranged between the base (6) and the vibration cylinder (5), and a support foot (61) is provided at the bottom of the base (6), and the support foot (61) is made of a flexible material.

6. The rotary hook grinding device for a sewing machine according to claim 5, characterized in that: The shock absorbing member (7) comprises an inner rod (71), a connecting sleeve (72) and a shock absorbing spring (73); the inner rod (71) is slidably connected to the connecting sleeve (72); the inner rod (71) and the connecting sleeve (72) are arranged inside the shock absorbing spring (73); and two ends of the shock absorbing spring (73) are respectively fixed to the base (6) and the cylinder bottom plate (54).

7. The rotary hook grinding device for a sewing machine according to claim 5, characterized in that: The support frame (3) comprises a support cross bar (31), and support vertical bars (33) are respectively provided at both ends of the support cross bar (31). An avoidance circle (32) is provided on the support cross bar (31), and the avoidance circle (32) is arranged corresponding to the rotating motor (2).

8. The rotary hook grinding device for a sewing machine according to any one of claims 1 to 7, characterized in that: A vibration motor (10) and a hydraulic rod (4) are provided at the bottom of the vibration cylinder (5); the hydraulic rod (4) is fixedly connected to the supporting upright rod (33); the hydraulic rod (4) is fixedly connected to the top cover (1); the hydraulic rod (4) is configured to drive the top cover (1) to move; the vibration motor (10) is fixedly connected to the base (6); and the vibration motor (10) is configured to drive the vibration cylinder (5) to vibrate.

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