An automatically feeding printer storage bin

Abstract

This invention proposes an automatically feeding printer hopper, relating to the technical field of 3D printer hoppers. It includes a frame, a large hopper, a main hopper, and a printhead assembly, as well as a telescopic tube, a plunger, and a compression spring. A guide cylinder is provided within the large hopper, and the plunger is movably inserted into the guide cylinder. The two ends of the compression spring abut against the top wall of the guide cylinder and the upper end of the plunger, respectively. The lower part of the plunger is inserted into a guide tube. The telescopic tube is movably inserted into the cylinder via a telescopic mechanism. The telescopic tube has a closed upper end and an open lower end, with a discharge port on its circumference, corresponding to the plunger. The telescopic mechanism drives the telescopic tube upwards along the cylinder, allowing it to enter the guide tube and overcome the spring force to push the plunger upwards, allowing the discharge port on the circumference of the telescopic tube to enter the large hopper. Then, the raw material in the large hopper enters the telescopic tube through the discharge port and then enters the main hopper through the telescopic tube.

Description

Technical Field

[0001] This invention relates to the technical field of 3D printers, and more specifically to the technical field of 3D printer storage hoppers. Background Technology

[0002] 3D printing eliminates the need for machining or molds, directly generating objects of any shape from computer graphics data. This significantly shortens product production cycles and increases productivity. 3D printing is widely used in design, especially industrial design and digital product mold making. A mold can be printed in just a few hours, drastically reducing product development cycles. 3D printers can use various materials to print three-dimensional models. Using 3D-aided design software, engineers design a model or prototype—whether it's a house or an artificial heart valve—and then print it using a 3D printer manufactured by a relevant company. The printing materials can be organic or inorganic, such as rubber or plastic. Existing 3D printer equipment mainly consists of a frame, transmission system, main material bin, electrical control system, and print head assembly. During operation, the required printing material is added to the main material bin, and printing is performed through the print head assembly. When the material in the main material bin is depleted and needs to be replenished, it usually requires manual feeding. This feeding method is slow, reducing 3D printing efficiency and increasing labor costs. Summary of the Invention

[0003] This invention proposes an automatic feeding printer storage bin, which solves the problems of slow feeding speed and high labor costs caused by manual feeding in the prior art.

[0004] The technical solution of this invention is implemented as follows:

[0005] An automatically feeding printer storage bin includes a frame, a large storage bin, a main storage bin, and a printhead assembly. The large storage bin is fixedly mounted on the frame, and a guide tube is provided at the bottom of the large storage bin. The printhead assembly is mounted on the frame via an X-axis linear module and a Y-axis linear module. The main storage bin is mounted on the printhead assembly. The device also includes a telescopic tube, a plunger, and a compression spring. A guide cylinder is provided inside the large storage bin, and the plunger is movably inserted into the guide cylinder. The compression spring is located inside the guide cylinder, with its two ends abutting against the top wall of the guide cylinder and the upper end of the plunger, respectively. The lower part of the plunger is inserted into the guide tube. A cylinder communicating with the interior of the main storage bin is provided at the top of the main storage bin. The telescopic tube is movably inserted into the cylinder via a telescopic mechanism. The telescopic tube has a closed upper end and an open lower end structure, with a discharge port on its circumference. The telescopic tube corresponds to the plunger.

[0006] Furthermore, the telescopic mechanism includes a first motor, a rotating shaft, and a worm gear. A limiting groove is provided on the side wall of the cylinder, and a housing is provided on the side of the cylinder. A toothed rack is provided on the side wall of the telescopic tube, and the toothed rack is movably engaged in the limiting groove. The rotating shaft is movably installed in the housing, and a first gear and a worm wheel are provided on the rotating shaft. The first gear meshes with the toothed rack, and the worm gear is movably installed in the housing and meshes with the worm wheel. The first motor is fixedly installed on the housing and is connected to the worm gear drive through a coupling.

[0007] Furthermore, it also includes a bearing housing, a rotating seat, and a vibrator. A support plate is provided on the frame, the bearing housing is fixedly mounted on the support plate, and the rotating seat is movably mounted on the bearing housing via a rotation drive mechanism. A first clearance groove, a second clearance groove, and a third clearance groove are respectively provided on the rotating seat, the bearing housing, and the support plate. The rotating seat is sleeved on the outside of the large hopper through the first clearance groove, and the guide pipe passes through the second clearance groove and the third clearance groove. The vibrator is fixedly mounted on the rotating seat, and the vibrator corresponds to the side wall of the large hopper.

[0008] Furthermore, the rotary drive mechanism includes a second motor, a gear ring is provided on the rotary seat, the second motor is fixedly mounted on the frame, and a second gear is provided on the output shaft of the second motor, the second gear meshing with the gear ring.

[0009] Furthermore, it also includes a thrust bearing and a radial bearing. The thrust bearing is fitted inside the bearing housing, and the rotating seat is movably mounted on the thrust bearing. The radial bearing is fitted inside the bearing housing and sleeved on the outside of the rotating seat.

[0010] Furthermore, the vibrator includes a support, a housing, a stationary iron core, an excitation coil, a moving iron core, and a first spring. The support is fixedly mounted on a rotating base and has a guide hole and a limiting plate with a through hole. The moving iron core is movably inserted through the guide hole and the through hole of the support and has a baffle. The first spring is sleeved on the moving iron core, with its two ends abutting against the support and the baffle, respectively. The baffle corresponds to the limiting plate. A hammer is provided at the end of the moving iron core, corresponding to the outer wall of the large hopper. The housing is fixedly mounted on the support, the stationary iron core is fixedly mounted inside the housing, the excitation coil is fixedly wound around the outside of the stationary iron core, and the moving iron core corresponds to the stationary iron core.

[0011] Furthermore, it also includes a rotary power connection mechanism, which comprises an annular insulating seat, a terminal stud, a voltage-conducting block, a second spring, a conductive ring, a flexible wire, and a connecting wire. The rotary seat is made of insulating material and has an annular boss. The conductive rings are arranged in rows and fixedly sleeved on the outer periphery of the annular boss. The annular insulating seat is fixedly mounted on a support plate and located outside the annular boss. A guide groove is provided inside the annular insulating seat. A metal support rod is provided on the voltage-conducting block and is movably inserted into the guide groove. The second spring is sleeved on the metal support rod, and its two ends abut against the inner peripheral walls of the voltage-conducting block and the annular insulating seat, respectively. The voltage-conducting block presses against the conductive ring. The terminal stud is fixedly mounted on the outer periphery of the annular insulating seat and is electrically connected to the metal support rod through a flexible wire. The connecting wire is fixedly inserted through the rotary seat and the annular boss. One end of the connecting wire is electrically connected to the conductive ring, and the other end is electrically connected to the excitation coil of the vibrator.

[0012] The beneficial effects that can be achieved by adopting the above-mentioned technical solution in this invention are:

[0013] 1. When the printing material in the main material bin is insufficient and needs to be replenished, the X-axis linear module and Y-axis linear module move the print head assembly and the main material bin below the large material bin, and align the telescopic tube and the guide tube on the same axis. Then, the telescopic mechanism drives the telescopic tube to move upward along the cylinder, allowing the telescopic tube to enter the guide tube. Overcoming the spring force, the plunger is pushed upward, allowing the feed port on the periphery of the telescopic tube to enter the large material bin. The material in the large material bin then enters the telescopic tube through the feed port, and then enters the main material bin through the telescopic tube. This achieves automatic feeding of the 3D printer, eliminating the need for manual feeding, effectively improving 3D printing efficiency and saving labor costs.

[0014] 2. During the feeding process of the main material hopper, the hammer head of the vibrator's moving iron core continuously vibrates the outer wall of the large material hopper, thereby accelerating the feeding of raw materials and preventing the raw materials from caking and clogging inside the large material hopper. The rotary drive mechanism can drive the rotating seat to rotate, thereby changing the vibration position and vibrating the outer wall of the large material hopper from all directions, thereby accelerating the feeding speed and further improving the 3D printing efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 for Figure 1 Partial schematic diagram of the medium and large material silos, vibrators, rotary seats, etc.;

[0018] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0019] Figure 4 for Figure 2 A magnified view of a portion of point B in the middle;

[0020] Figure 5 for Figure 1 A magnified view of a portion of point C in the middle;

[0021] Figure 6 for Figure 5 DD sectional view;

[0022] Figure 7 This is a schematic diagram of the material feeding process of the present invention;

[0023] Figure 8 for Figure 7 A magnified view of a portion of point H in the middle.

[0024] In the attached diagram, the components corresponding to each number are as follows:

[0025] 1-Frame, 2-Large Material Bin, 3-Main Material Bin, 4-Print Head Assembly, 5-Feed Inlet, 6-Guide Tube, 7-X-Axis Linear Module, 8-Y-Axis Linear Module, 9-Telescopic Tube, 10-Plunger, 11-Compression Spring, 12-Guide Cylinder, 13-Cylinder Body, 14-Discharge Port, 15-First Motor, 16-Rotating Shaft, 17-Worm Gear, 18-Limiting Groove, 19-Housing, 20-Gear Row, 21-First Gear, 22-Worm Gear, 23-Coupling, 24-Bearing Seat, 25-Rotating Seat, 26-Vibrator, 27-Support Plate, 28-First Clearance Groove, 29-Second Clearance Groove, 30-Third Clearance Groove 31-Second motor, 32-Ring gear, 33-Second gear, 34-Thrust bearing, 35-Radial bearing, 36-Support, 37-Housing shell, 38-Stationary iron core, 39-Excitation coil, 40-Moving iron core, 41-First spring, 42-Guide hole, 43-Limiting plate, 44-Through hole, 45-Baffle, 46-Hammer, 47-Annular insulating seat, 48-Connecting stud, 49-Conductive block, 50-Second spring, 51-Conductive ring, 52-Flexible wire, 53-Connecting wire, 54-Annular boss, 55-Guide groove, 56-Metal support rod, 57-Bracket, 58-Top wall of guide cylinder. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Reference Figure 1 An automatically feeding printer material storage bin includes a frame 1, a large material bin 2, a main material bin 3, a printhead assembly 4, a telescopic tube 9, a plunger 10, a compression spring 11, a bearing seat 24, a rotating seat 25, a vibrator 26, a thrust bearing 34, a radial bearing 35, and a rotary power connection mechanism. The large material bin 2 is fixedly mounted on the frame 1. A material inlet 5 is located at the top of the large material bin 2, and a guide tube 6 is located at the bottom of the large material bin 2. The printhead assembly 4 is connected via an X-axis linear module 7. The Y-axis linear module 8 is mounted on the frame 1, and the main material bin 3 is mounted on the printhead assembly 4. A guide cylinder 12 is provided inside the large material bin 2. The plunger 10 is movably inserted into the guide cylinder 12. The plunger 10 can be in a stepped shaft form to prevent it from coming out of the guide cylinder 12. A compression spring 11 is located inside the guide cylinder 12, with its two ends abutting against the top wall 58 of the guide cylinder 12 and the upper end of the plunger 10, respectively. The lower part of the plunger 10 is inserted into the guide tube 6. A cylinder 13 communicating with the interior of the main material bin 3 is provided at the top of the main material bin 3. The telescopic tube 9 is movably inserted into the cylinder 13 via a telescopic mechanism. The specific structure of the telescopic mechanism is as follows: (Refer to...) Figure 5 and Figure 6 The telescopic mechanism includes a first motor 15, a rotating shaft 16, and a worm gear 17. A limiting groove 18 is provided on the side wall of the cylinder 13, and a housing 19 is provided on the side of the cylinder 13. A gear rack 20 is provided on the side wall of the telescopic tube 9, and the gear rack 20 is movably engaged within the limiting groove 18. The rotating shaft 16 is movably installed within the housing 19, and a first gear 21 and a worm wheel 22 are provided on the rotating shaft 16. The first gear 21 meshes with the gear rack 20. The worm gear 17 is movably installed within the housing 19 and meshes with the worm wheel 22. The first motor 15 is fixedly installed on the housing 19 and is connected to the worm gear 17 via a coupling 23. The telescopic tube 9 has a closed upper end and an open lower end structure, with a discharge port 14 on the circumferential part of the telescopic tube 9. The telescopic tube 9 corresponds to the plunger 10.

[0028] Reference Figure 2 A support plate 27 is provided on the frame, and the bearing seat 24 is fixedly installed on the support plate 27. The rotating seat 25 is movably installed on the bearing seat 24 through a rotating drive mechanism. The specific connection relationship between the rotating seat 25 and the bearing seat 24, and the specific structure of the rotating drive mechanism are as follows: (Refer to...) Figure 3The thrust bearing 34 is fitted inside the bearing housing 24, and the rotating seat 25 is movably mounted on the thrust bearing 34. The radial bearing 35 is fitted inside the bearing housing 24 and sleeved on the outside of the rotating seat 25. The rotation drive mechanism includes a second motor 31, and a gear ring 32 is provided on the rotating seat 25. The second motor 31 is fixedly mounted on the frame 1, and a second gear 33 is provided on the output shaft of the second motor 31, which meshes with the gear ring 32. A first clearance groove 28, a second clearance groove 29, and a third clearance groove 30 are respectively provided on the rotating seat 25, the bearing housing 24, and the support plate 27. The rotating seat 25 is sleeved on the outside of the large hopper 2 through the first clearance groove 28, and the guide pipe 6 passes through the second clearance groove 29 and the third clearance groove 30. The vibrator 26 is fixedly mounted on the rotating seat 25, and the vibrator 26 corresponds to the side wall of the large hopper 2.

[0029] The specific structure of the vibrator 26 is as follows: (Refer to...) Figure 4 The vibrator 26 includes a support 36, a housing 37, a stationary iron core 38, an excitation coil 39, a moving iron core 40, and a first spring 41. The support 36 is fixedly mounted on the rotating seat 25 via a bracket 57. The support 36 has a guide hole 42, a limiting plate 43, and a through hole 44. The moving iron core 40 is movably inserted through the guide hole 42 and the through hole 44 of the support 36. A baffle 45 is provided on the moving iron core 40. Spring 41 is sleeved on moving iron core 40. The two ends of the first spring 41 abut against support 36 and baffle 45 respectively. Baffle 45 corresponds to limiting plate 43. Hammer head 46 is provided at the end of moving iron core 40. Hammer head 46 corresponds to the outer wall of large hopper 2. The outer shell 37 is fixedly installed on support 36. The stationary iron core 38 is fixedly installed inside outer shell 37. Excitation coil 39 is fixedly wound on the outside of stationary iron core 38. Moving iron core 40 corresponds to stationary iron core 38.

[0030] Reference Figure 2 and Figure 3The rotary connection mechanism includes an annular insulating seat 47, a terminal stud 48, a voltage conductive block 49, a second spring 50, a conductive ring 51, a flexible wire 52, and a connecting wire 53. The rotating seat 25 is made of insulating material and has an annular boss 54. The conductive rings 51 are arranged in rows and fixedly sleeved on the outer periphery of the annular boss 54. The annular insulating seat 47 is fixedly installed on the support plate 27 and located outside the annular boss 54. A guide groove 55 is provided inside the annular insulating seat 47. A metal support rod 56 is provided on the voltage conductive block 49, and the metal support rod 56 is movably inserted into the voltage conductive block 49. Inside the groove 55, the second spring 50 is sleeved on the metal support rod 56. The two ends of the second spring 50 abut against the inner peripheral walls of the voltage conducting block 49 and the annular insulating seat 47, respectively. The voltage conducting block 49 presses against the conductive ring 51. The wiring stud 48 is fixedly installed on the outer peripheral part of the annular insulating seat 47. The wiring stud 48 is electrically connected to the metal support rod 56 through the flexible wire 52. The connecting wire 53 is fixedly inserted into the rotating seat 25 and the annular boss 54. One end of the connecting wire 53 is electrically connected to the conductive ring 51, and the other end is electrically connected to the excitation coil 39 of the vibrator 26.

[0031] The working principle of the automatically feeding printer storage bin of the present invention is as follows: the printhead assembly 4 receives printing raw materials from the large storage bin 2 through the main storage bin 3 at the upper end, and then performs 3D printing through the printhead assembly 4. When the printing raw materials in the main storage bin 3 are insufficient and need to be replenished, refer to... Figure 7 The X-axis linear module 7 and Y-axis linear module 8 move the printhead assembly 4 and main material bin 3 below the large material bin 2, aligning the telescopic tube 9 and the guide tube 6 on the same axis. Then, the first motor 15 of the telescopic mechanism drives the worm gear 17 to rotate, which in turn drives the worm wheel 22, the rotating shaft 16, and the first gear 21 to rotate. The first gear 21 then drives the gear rack 20 and the telescopic tube 9 to move upwards along the cylinder 13, allowing the telescopic tube 9 to enter the guide tube 6. Overcoming the spring force of the compression spring 11, the plunger 10 is pushed upwards, allowing the discharge port 14 on the circumference of the telescopic tube 9 to enter the large material bin 2, forming a... Figure 8 As shown in the diagram, the raw material in the large hopper 2 then enters the telescopic tube 9 through the discharge port 14, and then enters the main hopper 3 through the telescopic tube 9, thus realizing automatic feeding of the 3D printer.

[0032] During the feeding process, the excitation coil 39 of the vibrator 26 is powered on via the wiring stud 48, and a positive half-cycle pulse DC voltage is applied to the excitation coil 39. When the excitation coil 39 is energized, the stationary iron core 38 generates a magnetic force that attracts the moving iron core 40. The moving iron core 40 overcomes the elastic force of the first spring 41 and moves towards the stationary iron core 38. When the excitation coil 39 is de-energized, the magnetic force of the stationary iron core 38 disappears, and the moving iron core 40 moves rapidly under the action of the elastic force of the first spring 41, striking the outer wall of the large hopper 2 with the hammer head 46. This process is repeated continuously, with the hammer 46 of the moving iron core 40 continuously striking the outer wall of the large hopper 2, thereby accelerating the feeding of raw materials and preventing the raw materials from caking and clogging inside the large hopper 2. The rotating drive mechanism can drive the rotating seat 25 to rotate, thereby changing the striking position and striking the outer wall of the large hopper 2 from all directions. When it is necessary to change the striking position, the stationary iron core 38 is first magnetized to attract the moving iron core 40, and then the second motor 31 drives the rotating seat 25 to rotate at a certain angle, thus changing the striking position.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A printer material storage bin with automatic feeding capability, comprising a frame (1), a large material bin (2), a main material bin (3), and a printhead assembly (4), wherein the large material bin (2) is fixedly mounted on the frame (1), and a guide pipe (6) is provided at the bottom of the large material bin (2); the printhead assembly (4) is mounted on the frame (1) via an X-axis linear module (7) and a Y-axis linear module (8); and the main material bin (3) is mounted on the printhead assembly (4), characterized in that, It also includes a telescopic tube (9), a plunger (10) and a compression spring (11). A guide cylinder (12) is provided in the large hopper (2). The plunger (10) is movably inserted in the guide cylinder (12). The compression spring (11) is located in the guide cylinder (12). The two ends of the compression spring (11) abut against the top wall (58) of the guide cylinder (12) and the upper end of the plunger (10) respectively. The lower part of the plunger (10) is inserted in the guide tube (6). A cylinder (13) communicating with the inside of the main hopper (3) is provided at the top of the main hopper (3). The telescopic tube (9) is movably inserted in the cylinder (13) through a telescopic mechanism. The telescopic tube (9) has a closed upper end and an open lower end structure. A discharge port (14) is provided on the upper part of the telescopic tube (9). The telescopic tube (9) corresponds to the plunger (10). The telescopic mechanism includes a first motor (15), a rotating shaft (16), and a worm gear (17). A limiting groove (18) is provided on the side wall of the cylinder (13). A housing (19) is provided on the side of the cylinder (13). A toothed rack (20) is provided on the side wall of the telescopic tube (9). The toothed rack (20) is movably locked in the limiting groove (18). The rotating shaft (16) is movably installed in the housing (19). A first gear (21) and a worm wheel (22) are provided on the rotating shaft (16). The first gear (21) meshes with the toothed rack (20). The worm gear (17) is movably installed in the housing (19) and meshes with the worm wheel (22). The first motor (15) is fixedly installed on the housing (19) and is connected to the worm gear (17) for transmission. It also includes a bearing seat (24), a rotating seat (25), and a vibrator (26). A support plate (27) is provided on the frame. The bearing seat (24) is fixedly installed on the support plate (27). The rotating seat (25) is movably installed on the bearing seat (24) through a rotation drive mechanism. A first clearance groove (28), a second clearance groove (29), and a third clearance groove (30) are respectively provided on the rotating seat (25), the bearing seat (24), and the support plate (27). The rotating seat (25) is sleeved on the outside of the large hopper (2) through the first clearance groove (28). The guide pipe (6) passes through the second clearance groove (29) and the third clearance groove (30). The vibrator (26) is fixedly installed on the rotating seat (25). The vibrator (26) corresponds to the side wall of the large hopper (2).

2. The printer storage bin with automatic feeding capability as described in claim 1, characterized in that, The rotary drive mechanism includes a second motor (31), a gear ring (32) is provided on the rotary seat (25), the second motor (31) is fixedly mounted on the frame (1), and a second gear (33) is provided on the output shaft of the second motor (31), the second gear (33) meshes with the gear ring (32).

3. The printer storage bin with automatic feeding capability as described in claim 1, characterized in that, It also includes a thrust bearing (34) and a radial bearing (35). The thrust bearing (34) is fitted inside the bearing housing (24), and the rotating seat (25) is movably mounted on the thrust bearing (34). The radial bearing (35) is fitted inside the bearing housing (24) and sleeved on the outside of the rotating seat (25).

4. The printer storage bin with automatic feeding capability as described in claim 1, characterized in that, The vibrator (26) includes a support (36), a housing (37), a stationary iron core (38), an excitation coil (39), a moving iron core (40), and a first spring (41). The support (36) is fixedly mounted on a rotating seat (25). A guide hole (42) is provided on the support (36), a limiting plate (43) is provided on the support (36), and a through hole (44) is provided on the limiting plate (43). The moving iron core (40) is movably inserted into the guide hole (42) and the through hole (44) of the support (36). A baffle (45) is provided on the moving iron core (40). The first spring... Spring (41) is sleeved on moving iron core (40). The two ends of the first spring (41) abut against support (36) and baffle (45) respectively. Baffle (45) corresponds to limiting plate (43). Hammer head (46) is provided at the end of moving iron core (40). Hammer head (46) corresponds to the outer wall of large hopper (2). The outer shell (37) is fixedly installed on support (36). The stationary iron core (38) is fixedly installed inside the outer shell (37). The excitation coil (39) is fixedly wound around the outside of stationary iron core (38). Moving iron core (40) corresponds to stationary iron core (38).

5. The printer storage bin with automatic feeding capability as described in claim 1, characterized in that, It also includes a rotary power connection mechanism, which includes an annular insulating seat (47), a wiring stud (48), a voltage conductive block (49), a second spring (50), a conductive ring (51), a flexible wire (52), and a connecting wire (53). The rotating seat (25) is made of insulating material and has an annular boss (54) on it. The conductive rings (51) are fixedly fitted in rows on the outer periphery of the annular boss (54). The annular insulating seat (47) is fixedly installed on the support plate (27) and located outside the annular boss (54). A guide groove (55) is provided in the annular insulating seat (47). A metal support rod (56) is provided on the voltage conductive block (49). The metal support rod (56) is movable. Inserted into the guide groove (55), the second spring (50) is sleeved on the metal support rod (56). The two ends of the second spring (50) abut against the inner peripheral wall of the voltage conducting block (49) and the annular insulating seat (47), respectively. The voltage conducting block (49) presses against the conductive ring (51). The wiring stud (48) is fixedly installed on the outer peripheral part of the annular insulating seat (47). The wiring stud (48) is electrically connected to the metal support rod (56) through the flexible wire (52). The connecting wire (53) is fixedly inserted into the rotating seat (25) and the annular boss (54). One end of the connecting wire (53) is electrically connected to the conductive ring (51), and the other end is electrically connected to the excitation coil (39) of the vibrator (26).

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