Ultrasonic atomization tin powder device

By using the design of rotating and tapping components in the ultrasonic atomized tin powder device, the problem of tin powder adhering to the inner wall of the atomized barrel is solved, and the atomization efficiency and powder collection efficiency are improved.

CN222344219UActive Publication Date: 2025-01-14WUXI GUANGJIEFU METAL PROD CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421029188.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-13
Publication Date
2025-01-14
Estimated Expiration
2034-05-13

AI Technical Summary

Technical Problem

During the manufacturing process of the existing ultrasonic atomizing tin powder device, the condensed tin powder is easily attached to the cylinder wall of the atomizing barrel, resulting in inconvenient collection.

Method used

A device including a support frame, an ultrasonic atomization assembly and a driving assembly are designed to drive the ultrasonic atomization assembly to rotate and knock the inner wall of the atomized barrel through the driving assembly, expanding the distribution area of ​​metal melt dripping and improving Atomization efficiency, while avoiding the condensed metal powder adhering to the inner wall of the atomization barrel.

Benefits of technology

The atomization efficiency is effectively improved, and the vibration of the knocking assembly prevents the tin powder from adhering to the inner wall of the atomization barrel, making it easier to fully collect the generated metal powder.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222344219U_ABST
    Figure CN222344219U_ABST
Patent Text Reader

Abstract

The utility model belongs to the field of metal powder processing, and particularly relates to an ultrasonic atomization tin powder device which comprises a supporting frame, an atomization barrel is fixedly installed in the middle of the top of the supporting frame, ultrasonic atomization assemblies are symmetrically and fixedly installed on the two side walls of the atomization barrel, and each ultrasonic atomization assembly comprises a connecting flange. A bearing seat is fixedly mounted in the middle of the connecting flange and mounted in a mounting hole formed in the side wall of the atomization barrel in an embedded mode, the connecting flange is fixedly mounted on the side wall of the atomization barrel, a fixing sleeve is fixedly mounted in the middle of the bearing seat, and an amplitude-change pole is fixedly mounted in the middle of the fixing sleeve. According to the ultrasonic atomization device, the ultrasonic atomization assembly, the driving assembly and the knocking assembly are arranged, so that the production efficiency of metal powder is improved, formed metal powder is effectively prevented from being attached to the inner wall of the barrel body, and the ultrasonic atomization device is convenient to use.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the field of metal powder processing, in particular to an ultrasonic atomizing tin powder device. Background Art

[0002] Ultrasonic atomization is a new type of metal atomization and powder production method that uses ultrasonic technology. The ultrasonic atomization of metal materials is a process that uses the principle of ultrasonic cavitation to break the metal melt into fine droplets, and the droplets condense to form powder particles. For the production of powder-grade metal materials, compared with traditional gas atomization, water atomization, and centrifugal atomization powder production processes, the ultrasonic atomization powder production process has the advantages of low energy consumption, small space requirements, good powder sphericity, and controllable particle size, making the ultrasonic atomization powder production process the main development trend in the field of metal powder production technology. During the powder production process of the ultrasonic atomization equipment, the metal melt flows out of the nozzle and drips onto the ultrasonic tool head. On the ultrasonic tool head, it is atomized into metal droplets by the action of ultrasonic waves, and then the droplets condense to form powder particles.

[0003] In the process of manufacturing tin powder, the existing ultrasonic atomizing tin powder device may cause the condensed tin powder to adhere to the wall of the atomizing barrel, making it difficult to collect. Therefore, an ultrasonic atomizing tin powder device is proposed to address the above problem. Utility Model Content

[0004] In order to make up for the shortcomings of the existing technology and solve the problem that the condensed tin powder may adhere to the cylinder wall of the atomizing barrel during the manufacturing process of tin powder in the existing ultrasonic atomizing tin powder device, making it difficult to collect, the utility model proposes an ultrasonic atomizing tin powder device.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an ultrasonic atomizing tin powder device described in the utility model comprises a support frame, an atomizing barrel body is fixedly installed in the middle of the top of the support frame, and ultrasonic atomizing components are symmetrically fixedly installed on the two side walls of the atomizing barrel body, and the ultrasonic atomizing component comprises a connecting flange, a bearing seat is fixedly installed in the middle of the connecting flange, and the bearing seat is embedded in the mounting hole opened on the side wall of the atomizing barrel body, the connecting flange is fixedly installed on the side wall of the atomizing barrel body, a fixing sleeve is fixedly installed in the middle of the bearing seat, and a variable amplitude rod is fixedly installed in the middle of the fixing sleeve, one end of the variable amplitude rod extends to the outside of the atomizing barrel body and an ultrasonic converter is fixedly installed on the end thereof, the other end of the variable amplitude rod extends to the inside of the atomizing barrel body and an atomizing contact head is fixedly installed on the end thereof, and the top of the atomizing barrel body is fixedly installed with a lower A material pipe, a nozzle is fixedly installed at the bottom end of the feed pipe, and the nozzle is vertically arranged directly above the atomizing contact head. A knocking assembly is installed inside the atomizing barrel body, and a driving assembly is provided on the outside of the atomizing barrel body. The driving assembly drives the fixed sleeve to rotate, and then drives the knocking assembly to knock and vibrate the inner wall of the atomizing barrel body. The ultrasonic atomizing assembly is installed on the atomizing barrel body through the connecting flange, which is convenient for disassembly and maintenance of the ultrasonic atomizing assembly. The molten metal dripping from the nozzle is atomized into fine droplets by the ultrasonic atomizing assembly, and the droplets condense to form powder particles. The ultrasonic atomizing assembly is driven to rotate by the driving assembly, so that the distribution area of ​​the molten metal dripping to the atomizing contact head is larger, thereby improving the atomization efficiency. At the same time, the knocking assembly is driven to knock and vibrate the inner wall of the atomizing barrel body to prevent the condensed metal powder from adhering to the inner wall of the atomizing barrel body, thereby facilitating the full collection of the generated metal powder.

[0006] Preferably, the driving assembly includes a mounting bracket, which is fixedly connected to the outer wall of the atomizing barrel body, a motor is fixedly installed on the top of the mounting bracket, a rotating shaft is fixedly connected to the output end of the motor, a transmission wheel 1 is fixedly installed in the middle of the rotating shaft, and a transmission wheel 2 is fixedly installed on the end side wall of the fixed sleeve located on the outer side of the atomizing barrel body. The transmission wheel 1 and the transmission wheel 2 are movably connected by a transmission belt. By setting up the driving assembly to drive the atomizing contact head to rotate, the distribution area of ​​the metal melt dripping to the atomizing contact head is larger, thereby improving the atomization efficiency.

[0007] Preferably, the knocking assembly includes a turntable, a protrusion fixedly connected to the side wall of the turntable, the cross-section of the protrusion is set to a right-angled trapezoid, and a support rod is provided under the turntable, the support rod is a horizontally placed L-shaped rod, the long rod of the support rod is perpendicular to the inner wall of the atomizer barrel body and is fixedly connected to a fixed block above the end, and the fixed block is fixedly installed on the inner wall of the atomizer barrel body by a fixing bolt, and a through hole 2 is opened on the short rod portion of the support rod, and a movable rod is slidably installed in the through hole 2, and the movable rod is set to a horizontally placed L-shaped rod, and the bent end of the movable rod is adjacent to the side wall of the turntable, and a rotating block is rotatably connected to the end of the bent end of the movable rod, and a roller is rotatably installed in the middle of the rotating block, and the end of the straight rod portion of the movable rod is in contact with the inner wall of the atomizer barrel body. By setting the knocking assembly to knock the inner wall of the atomizer barrel body, the condensed metal powder is prevented from adhering to the inner wall of the atomizer barrel body, so as to facilitate the full collection of the generated metal powder.

[0008] Preferably, a through hole one is provided on the short rod portion of the support rod and located above the through hole two, and a guide rod is provided in the through hole one. The guide rod is arranged in an L-shape, and one end of the guide rod slides through the through hole one, and the other end of the guide rod is fixedly mounted on the movable rod, and the movement direction of the movable rod is limited by setting the guide rod.

[0009] Preferably, a spring is sleeved on the guide rod, and the guide rod and the movable rod are reset by setting the spring.

[0010] Preferably, the protrusions are provided in multiple groups and are evenly distributed in annular shapes on the side wall of the turntable, so that the movable rod can intermittently knock on the atomizing barrel.

[0011] Preferably, a threaded connector is fixedly connected to the end of the guide rod, and a threaded hole is opened at a corresponding position on the movable rod. The threaded connector is adapted to the threaded hole, which facilitates quick disassembly and assembly of the knocking assembly.

[0012] The utility model is beneficial in that:

[0013] 1. The utility model drives the ultrasonic atomization component to rotate by setting a driving component. When in use, the motor drives the rotating shaft, the first transmission wheel, the transmission belt and the second transmission wheel to rotate, thereby driving the fixed sleeve, the amplitude rod and the atomization contact head to rotate, so that the distribution area of ​​the metal melt dripping onto the atomization contact head is larger, thereby improving the atomization efficiency.

[0014] 2. The utility model can knock and vibrate the inner wall of the atomizer barrel through the knocking assembly. When in use, the fixed sleeve rotates and drives the turntable to rotate at the same time. The turntable drives the protrusion to rotate, so that the roller on the movable rod moves along the inclined surface of the protrusion toward the highest point. At this time, the straight rod end of the movable rod gradually separates from the inner wall of the atomizer barrel, and the protrusion continues to move with the turntable. When the roller movement exceeds the highest point range of the protrusion, the movable rod is pushed to reset by the spring, so that the end of the movable rod knocks on the inner wall of the atomizer barrel, preventing the condensed metal powder from adhering to the inner wall of the atomizer barrel, which is convenient for fully collecting the generated metal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0017] Figure 2 is a cross-sectional view of embodiment 1;

[0018] Figure 3 For Example 1 Figure 2 A schematic diagram of the structure at center A;

[0019] Figure 4 It is a schematic diagram of the local structure of embodiment 1;

[0020] Figure 5 This is a schematic structural diagram of the knocking component of Example 1.

[0021] In the figure: 1. Support frame; 2. Atomizer barrel; 3. Feeding pipe; 4. Ultrasonic atomizer assembly; 41. Ultrasonic converter; 42. Amplitude transformer; 43. Connecting flange; 44. Bearing seat; 45. Fixing sleeve; 46. Atomizer contact head; 5. Driving assembly; 51. Mounting frame; 52. Motor; 53. Rotating shaft; 54. Transmission wheel 1; 55. Transmission wheel 2; 56. Transmission belt; 6. Knocking assembly; 61. Support rod; 62. Fixing block; 63. Fixing bolt; 64. Movable rod; 65. Through hole 1; 66. Through hole 2; 67. Guide rod; 68. Spring; 69. Turntable; 610. Bump; 611. Rotating block; 612. Roller; 613. Threaded connector; 614. Threaded hole; 7. Nozzle. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1

[0024] See also Figure 1-5 As shown, an ultrasonic atomization tin powder device comprises a support frame 1, an atomization barrel body 2 is fixedly installed in the middle of the top of the support frame 1, and ultrasonic atomization components 4 are symmetrically fixedly installed on the two side walls of the atomization barrel body 2, and the ultrasonic atomization component 4 comprises a connecting flange 43, a bearing seat 44 is fixedly installed in the middle of the connecting flange 43, and the bearing seat 44 is embedded in the mounting hole opened on the side wall of the atomization barrel body 2, the connecting flange 43 is fixedly installed on the side wall of the atomization barrel body 2, a fixing sleeve 45 is fixedly installed in the middle of the bearing seat 44, and a horn 42 is fixedly installed in the middle of the fixing sleeve 45, one end of the horn 42 extends to the outside of the atomization barrel body 2 and an ultrasonic converter 41 is fixedly installed on the end, and the other end of the horn 42 extends to the interior of the atomization barrel body 2 and is fixedly installed on the end There is an atomizing contact head 46, a feed pipe 3 is fixedly installed on the top of the atomizing barrel body 2, a nozzle 7 is fixedly installed on the bottom end of the feed pipe 3, and the nozzle 7 is vertically arranged directly above the atomizing contact head 46, a knocking assembly 6 is installed inside the atomizing barrel body 2, and a driving assembly 5 is provided outside the atomizing barrel body 2, which drives the fixed sleeve 45 to rotate through the driving assembly 5, and then drives the knocking assembly 6 to knock and vibrate the inner wall of the atomizing barrel body 2; when working, the ultrasonic converter 41 is started, and the vibration generated by the ultrasonic converter 41 is amplified by the amplitude rod 42, so that the atomizing contact head 46 generates high-frequency vibration, and then the metal melt is introduced into the feed pipe 3, and the metal melt drips from the nozzle 7 to the atomizing contact head 46 below. The metal melt is shaken into small metal droplets at the moment of contact, and the metal droplets condense to form metal powder.

[0025] The driving assembly 5 includes a mounting frame 51, which is fixedly connected to the outer wall of the atomizing barrel body 2. A motor 52 is fixedly installed on the top of the mounting frame 51, and a rotating shaft 53 is fixedly connected to the output end of the motor 52. A transmission wheel 1 54 is fixedly installed in the middle of the rotating shaft 53. The fixed sleeve 45 is located on the end side wall of the outer side of the atomizing barrel body 2 and a transmission wheel 2 55 is fixedly installed. The transmission wheel 1 54 and the transmission wheel 2 55 are movably connected through a transmission belt 56. When working, the motor 52 drives the rotating shaft 53, the transmission wheel 1 54, the transmission belt 56 and the transmission wheel 2 55 to rotate, thereby driving the fixed sleeve 45, the amplitude rod 42 and the atomizing contact head 46 to rotate, so that the distribution area of ​​the metal melt dripping to the atomizing contact head 46 is larger, thereby improving the atomization efficiency.

[0026] The knocking assembly 6 includes a turntable 69, a protrusion 610 is fixedly connected to the side wall of the turntable 69, and the cross-section of the protrusion 610 is set to a right-angled trapezoid. A support rod 61 is provided below the turntable 69, and the support rod 61 is a horizontally placed L-shaped rod. The long rod of the support rod 61 is perpendicular to the inner wall of the atomizer barrel body 2 and a fixed block 62 is fixedly connected to the upper end thereof. The fixed block 62 is fixedly installed on the inner wall of the atomizer barrel body 2 by a fixing bolt 63. A through hole 2 66 is provided on the short rod portion of the support rod 61, and a movable rod 64 is slidably installed in the through hole 2 66. The movable rod 64 is set to a horizontally placed L-shaped rod, and the end of the bent portion of the movable rod 64 is adjacent to the side wall of the turntable 69. The end of the bent portion of the movable rod 64 is rotatably connected to a rotating block 611, a roller 612 is installed in the middle of the rotating block 611, and the end of the straight rod part of the movable rod 64 is in contact with the inner wall of the atomizing barrel body 2; when working, the fixed sleeve 45 rotates and drives the turntable 69 to rotate, and the turntable 69 drives the protrusion 610 to rotate, so that the roller 612 on the movable rod 64 moves toward the highest point along the inclined surface of the protrusion 610. At this time, the end of the straight rod part of the movable rod 64 gradually separates from the inner wall of the atomizing barrel body 2, and the protrusion 610 continues to move with the turntable 69. When the roller 612 moves beyond the highest point range of the protrusion 610, the movable rod 64 is pushed to reset by the spring 68, so that the end of the movable rod 64 knocks on the inner wall of the atomizing barrel body 2, avoiding the condensed metal powder from adhering to the inner wall of the atomizing barrel body 2, so as to facilitate the full collection of the generated metal powder.

[0027] A through hole 1 65 is provided on the short rod portion of the support rod 61 and above the through hole 2 66. A guide rod 67 is provided in the through hole 1 65. The guide rod 67 is configured to be L-shaped. One end of the guide rod 67 slides through the through hole 1 65, and the other end of the guide rod 67 is fixedly mounted on the movable rod 64. During operation, the guide rod 67 is provided to limit the movement direction of the movable rod 64, so that the movable rod 64 can only move back and forth along the through hole 2 66 and will not rotate itself.

[0028] The guide rod 67 is sleeved with a spring 68 ; during operation, the guide rod 67 and the movable rod 64 are reset by the spring 68 .

[0029] The protrusions 610 are provided in multiple groups and are evenly distributed on the side wall of the turntable 69 in a circular shape; when working, the movable rod 64 can intermittently knock the atomizing barrel 2.

[0030] Example 2

[0031] See also Figure 5 As shown, compared with Example 1, as another implementation of the present invention, a threaded connector 613 is fixedly connected to the end of the guide rod 67, and a threaded hole 614 is opened at the corresponding position on the movable rod 64, and the threaded connector 613 is adapted to the threaded hole 614; during operation, when it is necessary to disassemble the knocking assembly 6, the fixing bolt 63 is first removed, the knocking assembly 6 can be removed, and then the guide rod 67 is pulled outward to disengage the end of the guide rod 67 from the through hole 1 65, and then the movable rod 64 is rotated 180 degrees. At this time, the guide rod 67 is located on the side away from the support rod 61, so that the guide rod 67 can be rotated, which is convenient for removing the guide rod 67 from the movable rod 64, so that it is convenient to disassemble and replace the parts of the knocking assembly 6.

[0032] Working principle: when working, the ultrasonic converter 41 is started, and the vibration generated by the ultrasonic converter 41 is amplified by the amplitude rod 42, so that the atomizing contact head 46 generates high-frequency vibration, and then the metal melt is introduced into the discharge pipe 3, and the metal melt drips from the nozzle 7 to the atomizing contact head 46 below. The metal melt is shaken into small metal droplets at the moment of contact, and the metal droplets condense to form metal powder. At the same time, the motor 52 drives the rotating shaft 53, the transmission wheel 1 54, the transmission belt 56 and the transmission wheel 2 55 to rotate, and then drives the fixed sleeve 45, the amplitude rod 42 and the atomizing contact head 46 to rotate, so that the distribution area of ​​the metal melt dripping to the atomizing contact head 46 is larger, thereby improving the atomization efficiency. In addition, the rotation of the fixed sleeve 45 drives the turntable 69 to rotate, and the turntable 69 drives the protrusion 610 to rotate, so that the roller 612 on the movable rod 64 moves along the inclined surface of the protrusion 610 toward the highest point. At this time, the end of the straight rod portion of the movable rod 64 gradually separates from the inner wall of the atomizing barrel body 2, and the protrusion 610 continues to move with the turntable 69. When the roller 612 moves beyond the highest point range of the protrusion 610, the spring 68 pushes the movable rod 64 to reset, so that the end of the movable rod 64 knocks on the inner wall of the atomizing barrel body 2, preventing the condensed metal powder from adhering to the inner wall of the atomizing barrel body 2, so as to facilitate the full collection of the generated metal powder.

[0033] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. An ultrasonic atomizing tin powder device, characterized in that: The invention comprises a support frame (1), an atomizing barrel body (2) is fixedly installed in the middle of the top of the support frame (1), an ultrasonic atomizing assembly (4) is symmetrically fixedly installed on the two side walls of the atomizing barrel body (2), the ultrasonic atomizing assembly (4) comprises a connecting flange (43), a bearing seat (44) is fixedly installed in the middle of the connecting flange (43), the bearing seat (44) is embedded in a mounting hole opened on the side wall of the atomizing barrel body (2), the connecting flange (43) is fixedly installed on the side wall of the atomizing barrel body (2), a fixing sleeve (45) is fixedly installed in the middle of the bearing seat (44), a variable amplitude rod (42) is fixedly installed in the middle of the fixing sleeve (45), one end of the variable amplitude rod (42) extends to An ultrasonic converter (41) is fixedly mounted on the outer side and end of the atomizing barrel body (2); the other end of the amplitude change rod (42) extends into the interior of the atomizing barrel body (2) and an atomizing contact head (46) is fixedly mounted on the end; a feed pipe (3) is fixedly mounted on the top of the atomizing barrel body (2); a nozzle (7) is fixedly mounted on the bottom end of the feed pipe (3); the nozzle (7) is vertically arranged directly above the atomizing contact head (46); a knocking assembly (6) is installed inside the atomizing barrel body (2); a driving assembly (5) is arranged outside the atomizing barrel body (2); the driving assembly (5) drives the fixed sleeve (45) to rotate, thereby driving the knocking assembly (6) to knock and vibrate the inner wall of the atomizing barrel body (2).

2. The ultrasonic atomizing tin powder device according to claim 1, characterized in that: The driving assembly (5) comprises a mounting frame (51), the mounting frame (51) being fixedly connected to the outer side wall of the atomizing barrel body (2), a motor (52) being fixedly mounted on the top of the mounting frame (51), a rotating shaft (53) being fixedly connected to the output end of the motor (52), a transmission wheel 1 (54) being fixedly mounted in the middle of the rotating shaft (53), a transmission wheel 2 (55) being fixedly mounted on the end side wall of the fixing sleeve (45) located on the outer side of the atomizing barrel body (2), and the transmission wheel 1 (54) and the transmission wheel 2 (55) being movably connected via a transmission belt (56).

3. The ultrasonic atomizing tin powder device according to claim 2, characterized in that: The tapping component (6) includes a turntable (69). A convex block (610) is fixedly connected to the side wall of the turntable (69). The cross-section of the convex block (610) is in the shape of a right trapezoid. A support rod (61) is arranged below the turntable (69). The support rod (61) is an L-shaped rod placed horizontally. The long rod of the support rod (61) is perpendicular to the inner wall of the atomizing barrel body (2), and a fixed block (62) is fixedly connected above the end. The fixed block (62) is fixedly installed on the inner wall of the atomizing barrel body (2) through a fixing bolt (63). A through hole two (66) is formed in the short rod part of the support rod (61). An activity rod (64) is slidably installed in the through hole two (66). The activity rod (64) is an L-shaped rod placed horizontally. The end of the bent part of the activity rod (64) is adjacent to the side wall of the turntable (69). A rotating block (611) is rotatably connected to the end of the bent part of the activity rod (64). A roller (612) is rotatably installed in the middle of the rotating block (611). The end of the straight rod part of the activity rod (64) is attached to the inner wall of the atomizing barrel body (2).

4. The ultrasonic atomizing tin powder device according to claim 3, characterized in that: A through hole one (65) is formed in the short rod part of the support rod (61) and above the through hole two (66). A guide rod (67) is arranged in the through hole one (65). The guide rod (67) is L-shaped. One end of the guide rod (67) slidably penetrates through the through hole one (65), and the other end of the guide rod (67) is fixedly installed on the activity rod (64).

5. The ultrasonic atomizing tin powder device according to claim 4, characterized in that: A spring (68) is sleeved on the guide rod (67).

6. The ultrasonic atomizing tin powder device according to claim 5, characterized in that: Multiple groups of the convex blocks (610) are provided and are evenly distributed in a circular ring on the side wall of the turntable (69).

7. The ultrasonic atomizing tin powder device according to claim 6, characterized in that: A threaded connection head (613) is fixedly connected to the end of the guide rod (67). A threaded hole (614) is formed at the corresponding position on the activity rod (64). The threaded connection head (613) is adapted to the threaded hole (614).