Plasma welding device for combing machine

Abstract

The invention relates to the technical field of plasma welding, and discloses a plasma welding device for a combing machine, comprising a bracket, a rotating plate fixedly connected to the top of the bracket, wherein the center of the rotating plate is hollow, so that the device can pass a high-voltage line, a connecting pipe, and an ionized gas pipe through the center and connect with an energy release device. A motor is fixedly connected to the outer side of the bracket, and the deflection angles of a connecting mechanism and a welding mechanism are controlled by the rotation of the motor. By setting the welding mechanism, the welding head of the plasma welding device is reduced and placed horizontally. Such a setting allows the device to directly extend the welding head into the gap between parts to weld the welding points when the welding position is perpendicular to the horizontal plane and the space between parts is relatively narrow during the production and processing of the combing machine, thereby enhancing the practical ability of the device.

Description

Technical Field

[0001] The invention relates to the technical field of plasma welding, in particular to a plasma welding device for a combing machine. Background Art

[0002] The combing machine is an important mechanical equipment in the textile industry. The main function of the combing machine is to finely comb the fibers to remove short fibers, impurities and cotton knots, etc., so as to improve the length uniformity, fineness uniformity and smoothness of the fibers. Its working principle is to repeatedly comb, separate, merge and stretch the input fiber strands through a series of combing components and motion mechanisms. The performance and efficiency of the combing machine have an important impact on the quality and cost of textile products. It has high technical content and precision requirements and is one of the indispensable key equipment in modern textile production.

[0003] The patent application with application number CN202210452810.5 discloses a plasma welding device for steel structure processing, including a handle, one end of the handle is fixedly connected to a gun body, a threaded cavity is provided at the top of the gun body, a pressure head is threadedly connected in the threaded cavity, a valve plate is fixedly connected to the lower end of the pressure head, a tungsten pole rod is fixedly connected to the lower end center of the pressure head, a water cooling channel I, a water cooling channel II, a reflux channel and an air cooling channel are provided in the gun body, a ceramic sleeve is threadedly connected to the bottom of the gun body, and a protective gas nozzle is movably sleeved at the bottom of the ceramic sleeve. Through the designed ionization chamber, pressure head and tungsten pole rod, the operator can adjust the relative position of the tungsten pole rod and the side wall of the ionization chamber through the pressure head when facing steel structures of different thicknesses, so that when ionization is performed to generate an arc, the length of the arc can be adjusted according to demand, so that the energy value of the arc can be adjusted to complete the welding of steel structures of different thicknesses.

[0004] When the above equipment is in use, the relative position of the tungsten electrode rod and the side wall of the ionization chamber is adjusted by the pressure head, so that when ionization is performed to generate an arc, the length of the arc can be adjusted as needed, so that the energy value of the arc can be adjusted, and steel structures of different thicknesses can be welded completely. However, when the combing machine is produced and processed, there are many welding positions that are not on a large plane. Some welding positions are vertical to the horizontal plane, and the space between parts is relatively narrow, which causes the welding head of the normal plasma welding equipment to be unable to effectively contact the welding point, which is not conducive to welding in production. Summary of the invention

[0005] The object of the present invention is to provide a plasma welding device for a combing machine to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A plasma welding device for a combing machine, comprising a bracket, a rotating plate is fixedly connected to the top of the bracket, wherein the center of the rotating plate is hollow, so that the device can pass a high-voltage line, a connecting pipe, and an ionized gas pipe through the center and connect to an energy release device, a motor is fixedly connected to the outer side of the bracket, and the deflection angle of the connecting mechanism and the welding mechanism is controlled by the rotation of the motor, and further comprising:

[0007] The connecting mechanism comprises a base rotatably connected to the inner wall of the bracket through a bearing, the output end of the motor is fixedly connected to the base, a notch is provided on the inner side of the base, so as to facilitate the device to extend the high-voltage line, the connecting pipe and the ionized gas pipe from the base, and to avoid squeezing and damaging the high-voltage line, the connecting pipe and the ionized gas pipe when the base is deflected, the outer wall of the base is rotatably connected to a limiting plate through a bearing, the end of the limiting plate away from the base is fixedly connected to the bracket, the outer wall of the base is also fixedly connected to a push rod, the top of the push rod is fixedly connected to a locking plate, the outer wall of the locking plate is movably connected to the base, the outer wall of the locking plate is movably connected to the limiting plate, and the outer wall of the base is also fixedly connected to a connecting plate, and the high-voltage line, the connecting pipe and the ionized gas pipe are movably connected by setting the connecting plate The connection plate is fixed to prevent the connection line from being entangled and damaged. The inner wall of the connection plate is fixedly connected with a high-voltage line, and current is applied to the tungsten electrode plate by setting the high-voltage line. The top of the high-voltage line is fixedly connected to the base. The inner wall of the connection plate is fixedly connected with a connecting pipe, and the top of the connecting pipe is fixedly connected to the base. The inner wall of the connection plate is fixedly connected with an ionized gas pipe, and the ionized gas pipe is set to transport ionized gas to the welding mechanism. The top of the ionized gas pipe is fixedly connected to the base. The inner wall of the base is fixedly connected with a circulating cooling device, and the front end of the welding mechanism is continuously cooled by setting. The left side of the circulating cooling device is fixedly connected with a water outlet pipe, and the right side of the circulating cooling device is fixedly connected with a water inlet pipe. The bottom of the base is fixedly connected with an annular plate 1, and the inner wall of the annular plate 1 is fixedly connected with the welding mechanism.

[0008] According to the above technical solution, the welding mechanism includes an outer shell 1, the outer wall of the outer shell 1 is fixedly connected to an annular plate 1, the inner wall of the outer shell 1 is fixedly connected to an inner shell, the outer wall of the inner shell is fixedly connected to a guide plate, and the side of the guide plate away from the inner shell is fixedly connected to the outer shell 1.

[0009] According to the above technical solution, the outer wall of the outer shell one is fixedly connected with a connector one, and the connector one penetrates the outer shell one and extends to the inner wall of the inner shell. The end of the ionized gas pipe away from the connecting plate is fixedly connected to the connector one, so that the ionized gas is transported to the interior of the inner shell through the connector one, and then the ionized gas is discharged from the device along the discharge direction of the inner shell through the electric arc.

[0010] According to the above technical solution, the outer wall of the outer shell one is fixedly connected with a connector two, and the connector two penetrates the outer shell one and extends between the outer shell one and the inner shell. The end of the water outlet pipe away from the circulating cooling device is fixedly connected to the connector two, and the end of the water inlet pipe away from the circulating cooling device is fixedly connected to the connector two. Through the setting of the guide plate, it is ensured that the equipment cools the front end of the inner shell while avoiding water residue between the inner shell and the outer shell, thereby ensuring the fluidity of the water flow and stabilizing the cooling effect.

[0011] According to the above technical solution, the outer wall of the shell one is fixedly connected to the shell two, the outer wall of the shell two is fixedly connected to the connector three, the connector three penetrates the shell two and extends to the inner wall of the shell two, the end of the connecting pipe away from the connecting plate is fixedly connected to the connector three, and the air-cooling airflow is transported to the shell two through the connecting pipe and the connector three. Such an arrangement ensures the secondary cooling of the shell one and the inner shell by the air-cooling airflow while stabilizing the direction of the ionized gas ejected by the equipment, ensuring the concentration of the plasma arc ejected by the equipment, and ensuring the welding effect of the equipment.

[0012] According to the above technical solution, one end of the outer shell 1 away from the outer shell 2 is fixedly connected to a circular plate, one end of the outer shell 1 away from the circular plate is fixedly connected to annular plate 2, the inner wall of the inner shell is fixedly connected to a track, and the outer wall of the track is movably connected to an auxiliary component.

[0013] According to the above technical solution, the auxiliary component includes a connecting ring, the outer wall of the connecting ring is provided with a sliding groove, the inner wall of the sliding groove is movably connected to the track, the end of the connecting ring away from the circular plate is fixedly connected to a connecting rod, and the end of the connecting rod away from the connecting ring is fixedly connected to a ring rod.

[0014] According to the above technical solution, a tungsten pole rod is fixedly connected to the inner wall of the circular plate, and a connector four is fixedly connected to one end of the tungsten pole rod away from the connecting ring, and one end of the high-voltage line away from the connecting plate is fixedly connected to the connector four. The outer wall of the tungsten pole rod is rotatably connected to a threaded rod through a bearing, and the outer wall of the threaded rod is threadedly connected to the connecting ring, and the outer wall of the threaded rod is fixedly connected to a gear one. The inner wall of the circular plate is rotatably connected to a gear two through a bearing, and the gear two is meshed with the gear one. The end of the gear two away from the connecting ring is fixedly connected to a knob, and the distance between the annular rod and the tungsten pole rod is controlled by rotating the knob, thereby controlling the size of the arc, and starting the device to adjust the arc length.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0016] 1. The present invention sets a welding mechanism to reduce the welding head of the plasma welding equipment and place it horizontally. This setting allows the equipment to directly extend the welding head into the gap between the parts to weld the welding points when the welding position is perpendicular to the horizontal plane and the space between the parts is relatively narrow during the production and processing of the combing machine, thereby enhancing the practical ability of the equipment.

[0017] 2. The present invention provides a connecting mechanism so that the device can change the direction of the welding head, so that the device does not need to replace the welding head when processing different positions of the combing machine. The device can weld welding points at different angles, thereby enhancing the practical ability of the device.

[0018] 3. The present invention sets a connecting mechanism, and after the device adjusts the deflection angle of the welding head, the rotation point of the device is fixed to avoid the ionized gas ejected from the welding head during welding affecting the deflection angle of the welding head, thereby ensuring the stable operation of the equipment.

[0019] 4. The present invention sets auxiliary components to ensure that the device can adjust the energy value of the arc while ensuring the miniaturization of the welding head, so as to complete the welding of steel structures of different thicknesses. When adjusting the energy value of the arc, the welding length will not be changed, ensuring that the device can be extended between parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a rear view of the connecting mechanism of the present invention;

[0023] Figure 3 is a schematic diagram of the connection mechanism of the present invention;

[0024] Figure 4 It is a schematic diagram of the welding mechanism of the present invention;

[0025] Figure 5 is a longitudinal sectional view of the welding mechanism of the present invention;

[0026] Figure 6 is a transverse cross-sectional view of the welding mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the internal parts of the welding mechanism of the present invention;

[0028] Figure 8 It is an exploded view of the welding mechanism of the present invention;

[0029] Fig. 9 is a schematic diagram of the auxiliary components of the present invention;

[0030] In the figure: 1, bracket; 101, rotating plate; 102, motor; 2, connecting mechanism; 201, base; 202, notch; 203, limiting plate; 204, push rod; 205, locking plate; 206, connecting plate; 207, high-voltage line; 208, connecting pipe; 209, ionized gas pipe; 2010, circulating cooling equipment; 2011, water outlet pipe; 2012, water inlet pipe; 2013, annular plate 1; 3, welding mechanism; 301, shell 1; 302 , connector one; 303, connector two; 304, outer shell two; 305, connector three; 306, annular plate two; 307, circular plate; 308, guide plate; 309, inner shell; 3010, track; 31, auxiliary component; 311, connecting ring; 312, slide groove; 313, connecting rod; 314, annular rod; 315, threaded rod; 316, gear one; 317, tungsten pole; 318, connector four; 319, gear two; 3110, knob. DETAILED DESCRIPTION

[0031] The following will be combined with the 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0032] Example 1: See Figure 1-Figure 3 The present invention provides a technical solution: a plasma welding device for a combing machine, comprising a bracket 1, a rotating plate 101 is fixedly connected to the top of the bracket 1, a motor 102 is fixedly connected to the outer side of the bracket 1, and further comprising:

[0033] The connecting mechanism 2 includes a base 201 rotatably connected to the inner wall of the bracket 1 through a bearing, the output end of the motor 102 is fixedly connected to the base 201, a notch 202 is provided on the inner side of the base 201, a limiting plate 203 is rotatably connected to the outer wall of the base 201 through a bearing, the limiting plate 203 is fixedly connected to the bracket 1 at one end away from the base 201, the outer wall of the base 201 is also fixedly connected to a push rod 204, and the top of the push rod 204 is fixedly connected to a locking plate The outer wall of the locking plate 205 is movably connected to the base 201, and the outer wall of the locking plate 205 is movably connected to the limiting plate 203. The outer wall of the base 201 is also fixedly connected to a connecting plate 206, and the inner wall of the connecting plate 206 is fixedly connected to a high-voltage line 207, and the top of the high-voltage line 207 is fixedly connected to the base 201. The inner wall of the connecting plate 206 is fixedly connected to a connecting pipe 208, and the top of the connecting pipe 208 is fixedly connected to the base 201. The inner wall of the connecting plate 206 is fixedly connected to the connecting pipe 208. The wall is fixedly connected with an ionized gas pipe 209, wherein the high-voltage line 207, the connecting pipe 208, and the ionized gas pipe 209 all pass through the base 201 through the notch 202 and the hollow center of the rotating plate 101, and are connected to the energy release unit to avoid squeezing and damage to the high-voltage line 207, the connecting pipe 208, and the ionized gas pipe 209 after the welding mechanism 3 is deflected. The top of the ionized gas pipe 209 is fixedly connected to the base 201, and the inner wall of the base 201 is fixedly connected with a circulating cooling device 2010, and the left side of the circulating cooling device 2010 is fixedly connected with a water outlet pipe 2011, and the right side of the circulating cooling device 2010 is fixedly connected with a water inlet pipe 2012. The water outlet pipe 211 and the water inlet pipe 212 are connected to one end of the circulating cooling device 2010 to ensure the circulation of water cooling in the equipment. The bottom of the base 201 is fixedly connected with an annular plate 2013, and the inner wall of the annular plate 2013 is fixedly connected with the welding mechanism 3.

[0034] The working principle of this embodiment is: when the welding angle of the welding equipment needs to be adjusted, the motor 102 is first started to drive the base 201 on the inner side of the bracket 1 to rotate. The rotation of the base 201 will drive the push rod 204 and the locking plate 205 to move together. When the base 201 reaches the deflection angle, the push rod 204 is started to drive the locking plate 205 to move toward the limiting plate 203, so that the locking plate 205 is embedded in the inner wall of the limiting plate 203 to fix the base 201.

[0035] Example 2: Based on Example 1, please refer to Figure 4-Figure 8The welding mechanism 3 includes a shell 301, the outer wall of the shell 301 is fixedly connected to the annular plate 2013, the inner wall of the shell 301 is fixedly connected to the inner shell 309, the outer wall of the inner shell 309 is fixedly connected to the guide plate 308, and the side of the guide plate 308 away from the inner shell 309 is fixedly connected to the shell 301. The coolant fed into the welding mechanism 3 will move from the water inlet pipe 2012 along the track of the guide plate 308 to the front end of the inner shell 309, and then move along the track of the guide plate 308 to the front end of the inner shell 309. The guide plate 308 moves to the outlet pipe 2011, blocking the shortest distance between the inlet pipe 2012 and the outlet pipe 2011, increasing the flow distance of the coolant, and ensuring the cooling effect of the equipment. The outer wall of the outer shell 301 is fixedly connected with a connector 302, which penetrates the outer shell 301 and extends to the inner wall of the inner shell 309. The end of the ionized gas pipe 209 away from the connecting plate 206 is fixedly connected to the connector 302. The outer wall of the outer shell 301 is fixedly connected to the outer wall of the inner shell 309. The outer wall of the outer shell 1 301 is fixedly connected with a second connector 303, the second connector 303 penetrates the outer shell 1 301 and extends between the outer shell 1 301 and the inner shell 309, the end of the water outlet pipe 2011 away from the circulating cooling device 2010 is fixedly connected to the second connector 303, the end of the water inlet pipe 2012 away from the circulating cooling device 2010 is fixedly connected to the second connector 303, the outer wall of the outer shell 1 301 is fixedly connected with the second outer shell 304, and the outer wall of the second outer shell 304 is fixedly connected with the third connector 305 , connector three 305 penetrates the outer shell two 304 and extends to the inner wall of the outer shell two 304, the end of the connecting pipe 208 away from the connecting plate 206 is fixedly connected to the connector three 305, the end of the outer shell one 301 away from the outer shell two 304 is fixedly connected to the circular plate 307, the end of the outer shell one 301 away from the circular plate 307 is fixedly connected to the annular plate two 306, the inner wall of the inner shell 309 is fixedly connected to the track 3010, and the outer wall of the track 3010 is movably connected to the auxiliary component 31.

[0036] The working principle of this embodiment is as follows: when the device is working, the ionized gas pipe 209 delivers ionized gas into the inner shell 309, and blows the electric welding out of the equipment through the auxiliary component 31, and the circulating cooling device 2010 allows cooling water to enter the gap formed between the outer shell 1 301, the inner shell 309, and the guide plate 308 through the water inlet pipe 2012 and the water outlet pipe 2011 to cool the equipment. At the same time, the cold air flow blown out by the connecting pipe 208 will be delivered to the front end of the inner shell 309 through the outer shell 2 304.

[0037] Example 3: Based on Example 2, please refer to Fig. 9The auxiliary component 31 includes a connecting ring 311, the outer wall of the connecting ring 311 is provided with a slide groove 312, the inner wall of the slide groove 312 is movably connected to the track 3010, the end of the connecting ring 311 away from the circular plate 307 is fixedly connected to a connecting rod 313, the end of the connecting rod 313 away from the connecting ring 311 is fixedly connected to an annular rod 314, the inner wall of the circular plate 307 is fixedly connected to a tungsten pole rod 317, and the end of the tungsten pole rod 317 away from the connecting ring 311 is fixedly connected to a connector 318, high voltage One end of the wire 207 away from the connecting plate 206 is fixedly connected to the connector four 318, the outer wall of the tungsten pole rod 317 is rotatably connected to the threaded rod 315 through a bearing, the outer wall of the threaded rod 315 is threadedly connected to the connecting ring 311, the outer wall of the threaded rod 315 is fixedly connected to the gear one 316, the inner wall of the circular plate 307 is rotatably connected to the gear two 319 through a bearing, the gear two 319 is meshed with the gear one 316, and the end of the gear two 319 away from the connecting ring 311 is fixedly connected to the knob 3110.

[0038] The working principle of this embodiment is: when the arc length needs to be adjusted, the rotating knob 3110 drives the gear 2 319 to rotate, the rotating gear 2 319 drives the gear 1 316 to rotate, and the rotating gear 1 316 drives the threaded rod 315 to rotate. As the threaded rod 315 rotates, the connecting ring 311 is driven to move along the track 3010, and the moving connecting ring 311 drives the annular rod 314 to move through the connecting rod 313, and then controls the distance between the annular rod 314 and the tungsten pole rod 317 to adjust the arc length.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. 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 plasma welding device for a combing machine, comprising a bracket (1), a rotating plate (101) being fixedly connected to the top of the bracket (1), and a motor (102) being fixedly connected to the outer side of the bracket (1), characterized in that: Also includes: A connecting mechanism (2), the connecting mechanism (2) comprising a base (201) rotatably connected to the inner wall of a bracket (1) via a bearing, the output end of the motor (102) being fixedly connected to the base (201), the inner side of the base (201) being provided with a notch (202), the outer wall of the base (201) being rotatably connected to a limiting plate (203) via a bearing, the limiting plate (203) being fixedly connected to the bracket (1) at one end away from the base (201), the outer wall of the base (201) being further fixedly connected to a push rod (204), the top of the push rod (204) being fixedly connected to a locking plate (205), the outer wall of the locking plate (205) being movably connected to the base (201), the outer wall of the locking plate (205) being movably connected to the limiting plate (203), the outer wall of the base (201) being further fixedly connected to a connecting plate (206), the inner side of the connecting plate (206) being further fixedly connected to the connecting plate (206). A high-voltage line (207) is fixedly connected to the wall, the top of the high-voltage line (207) is fixedly connected to the base (201), the inner wall of the connecting plate (206) is fixedly connected to a connecting pipe (208), the top of the connecting pipe (208) is fixedly connected to the base (201), the inner wall of the connecting plate (206) is fixedly connected to an ionized gas tube (209), the top of the ionized gas tube (209) is fixedly connected to the base (201), the inner wall of the base (201) is fixedly connected to a circulating cooling device (2010), the left side of the circulating cooling device (2010) is fixedly connected to a water outlet pipe (211), the right side of the circulating cooling device (2010) is fixedly connected to a water inlet pipe (212), the bottom of the base (201) is fixedly connected to an annular plate 1 (2013), and the inner wall of the annular plate 1 (2013) is fixedly connected to a welding mechanism (3); The welding mechanism (3) comprises an outer shell (301), the outer wall of the outer shell (301) being fixedly connected to an annular plate (2013), the inner wall of the outer shell (301) being fixedly connected to an inner shell (309), the outer wall of the inner shell (309) being fixedly connected to a guide plate (308), the side of the guide plate (308) away from the inner shell (309) being fixedly connected to the outer shell (301), and the outer wall of the outer shell (301) being fixedly connected to a connector (302 ), the connector 1 (302) penetrates the outer shell 1 (301) and extends to the inner wall of the inner shell (309), the end of the ionized gas pipe (209) away from the connecting plate (206) is fixedly connected to the connector 1 (302), the outer wall of the outer shell 1 (301) is fixedly connected to the connector 2 (303), the connector 2 (303) penetrates the outer shell 1 (301) and extends between the outer shell 1 (301) and the inner shell (309), the outlet pipe (2011) is away from the circulation One end of the circulating cooling device (2010) is fixedly connected to the second connector (303), one end of the water inlet pipe (2012) away from the circulating cooling device (2010) is fixedly connected to the second connector (303), the outer wall of the shell one (301) is fixedly connected to the second shell (304), the outer wall of the shell two (304) is fixedly connected to the third connector (305), and the third connector (305) penetrates the second shell (304) and extends to the inner wall of the second shell (304). One end of the connecting pipe (208) away from the connecting plate (206) is fixedly connected to the third connector (305); one end of the outer shell (301) away from the second outer shell (304) is fixedly connected to the circular plate (307); one end of the outer shell (301) away from the circular plate (307) is fixedly connected to the second annular plate (306); the inner wall of the inner shell (309) is fixedly connected to the track (3010); and the outer wall of the track (3010) is movably connected to the auxiliary component (31).

2. A plasma welding device for a combing machine according to claim 1, characterized in that: The auxiliary component (31) comprises a connecting ring (311), an outer wall of the connecting ring (311) is provided with a slide groove (312), an inner wall of the slide groove (312) is movably connected to the track (3010), one end of the connecting ring (311) away from the circular plate (307) is fixedly connected to a connecting rod (313), and one end of the connecting rod (313) away from the connecting ring (311) is fixedly connected to an annular rod (314).

3. A plasma welding device for a combing machine according to claim 2, characterized in that: The inner wall of the circular plate (307) is fixedly connected to a tungsten pole rod (317), and one end of the tungsten pole rod (317) away from the connecting ring (311) is fixedly connected to a fourth connector (318). One end of the high-voltage line (207) away from the connecting plate (206) is fixedly connected to the fourth connector (318). The outer wall of the tungsten pole rod (317) is rotatably connected to a threaded rod (315) via a bearing. The outer wall of the threaded rod (315) is threadedly connected to the connecting ring (311). The outer wall of the threaded rod (315) is fixedly connected to a gear one (316). The inner wall of the circular plate (307) is rotatably connected to a gear two (319) via a bearing. The gear two (319) meshes with the gear one (316). The end of the gear two (319) away from the connecting ring (311) is fixedly connected to a knob (3110).

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