A hot-dip galvanizing device for processing automobile bolts

Abstract

The present invention relates to the technical field of automobile parts processing, and specifically discloses a hot-dip galvanizing device for automobile bolt processing, comprising a processing cylinder, the top outer surface of which is fixedly connected with a top frame, wherein the top of the top frame is arranged above the processing cylinder, and further comprising: a galvanizing mechanism, which is slidably mounted on the top frame; and a reinforcing mechanism, which is movably mounted inside the processing cylinder. The present invention enables the slide bar to move downward through a limiting ring, and finally enables the stabilizing frame to move to the bottom of the slide slot, and the stabilizing frame is slightly higher than the containing ring, that is, the top of the containing ring is limited by the stabilizing frame, so that the bolt can move freely in the containing ring but cannot be separated from the containing ring, and the bolt is non-fixedly loaded by limiting the movable space of the bolt, thereby realizing a full range of galvanizing operations on the bolt during hot-dip galvanizing, avoiding the problem that the fixed part of the bolt cannot be galvanized due to the existing direct fixed operation, and greatly improving the galvanizing quality.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing, in particular to a hot-dip galvanizing device for automobile bolt processing. Background Art

[0002] In the process of automobile parts processing, hot-dip galvanizing equipment is used to improve the corrosion resistance and service life of automobile bolts. Hot-dip galvanizing forms a zinc layer on the surface of the bolts by immersing them in molten zinc liquid. This zinc layer can effectively isolate the bolts from corrosion by air, moisture, etc., and ensure the normal operation of the bolts in various harsh environments. Hot-dip galvanizing equipment is widely used in the automobile manufacturing industry chain, from parts production to vehicle assembly, to ensure the quality of automobile bolts, which plays a key role in the safety and reliability of automobiles.

[0003] However, traditional hot-dip galvanizing equipment for automobile bolts has many defects. In terms of galvanizing, direct fixing of bolts is often used for galvanizing, which makes it impossible for the fixed parts of the bolts to fully contact the zinc liquid, resulting in incomplete galvanizing and a large number of ungalvanized areas, which seriously affects the anti-corrosion performance and overall quality of the bolts. In terms of improving the galvanizing effect, traditional devices lack effective stirring of the zinc liquid and shaking operation of the bolts. The contact area between the zinc liquid and the bolts is limited, and it is impossible to ensure that the outer surface of the bolts is uniformly galvanized in all directions. It is easy to have galvanizing dead corners, which reduces the qualified rate of the product. In addition, for the treatment of oxides on the surface of the zinc liquid, traditional devices usually do not have an automatic collection mechanism. Excessive oxides on the surface of the zinc liquid will mix into the galvanizing process, increasing the production of galvanized defective products, which not only wastes raw materials, but also requires additional processes for screening and repair, which increases production costs and reduces production efficiency. It is difficult to meet the needs of modern automobile manufacturing for high-quality and high-efficiency production. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The present invention provides a hot-dip galvanizing device for processing automobile bolts, which solves the problems mentioned in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A hot-dip galvanizing device for processing automobile bolts, comprising a processing cylinder, a top frame is fixedly connected to the top outer surface of the processing cylinder, wherein the top of the top frame is arranged above the processing cylinder, and further comprising:

[0008] A galvanizing mechanism, wherein the galvanizing mechanism is slidably mounted on the top frame;

[0009] A reinforcing mechanism, the reinforcing mechanism being movably mounted inside the processing cylinder;

[0010] The galvanizing mechanism includes a sliding rod, the top of which is slidably connected to the top of the top frame, wherein the sliding rod is driven by an external hydraulic device, and the outer surface of the bottom of the sliding rod is elastically slidably sleeved with a sleeve, wherein the bottom surface of the sleeve and the bottom surface of the sliding rod are initially in the same horizontal plane, and the outer surface of the sleeve is fixedly connected to a mounting frame, and a containing ring is fixedly connected to the mounting frame, wherein three containing rings are arranged in a group, and six groups of containing rings are arranged at fixed intervals on the same mounting frame.

[0011] Preferably, a slide groove is provided through the bottom outer surface of the sleeve, six of the slide grooves are arranged as a group, and three groups of the slide grooves are arranged at fixed intervals along the outer surface of the sleeve, wherein the three groups of the slide grooves are arranged between adjacent mounting frames.

[0012] Preferably, the outer surface of the sleeve is slidably sleeved with a mounting ring, the mounting ring is fixedly connected to the outer surface of the slide rod via a slide groove, the outer surface of the mounting ring is fixedly connected with a stabilizing frame, the stabilizing frame is arranged directly above the containing ring, wherein the mounting ring is initially arranged at the top of the slide groove.

[0013] Preferably, a mounting groove is provided on the inner surface of the bottom of the processing cylinder, and a sliding ring is elastically slidably connected up and down in the mounting groove, wherein the elasticity of the sliding ring is greater than the elasticity between the sliding rod and the sleeve, and the inner side of the sliding ring is fixedly connected to a limiting ring through a connecting rod.

[0014] Preferably, the limiting ring and the sliding ring are arranged on the same central axis, and the upper surface of the limiting ring only contacts the bottom surface of the sleeve.

[0015] Preferably, the reinforcing mechanism includes a fitting tube, the bottom surface of the fitting tube is rotatably connected to the upper surface of the sliding ring, the outer surface of the fitting tube is fitted on the top inner surface of the processing cylinder, the outer surface of the fitting tube is fixedly connected with a spiral strip, the inner surface of the processing cylinder is provided with a spiral groove, and the spiral strip is fitted in the spiral groove.

[0016] Preferably, a toggle plate is fixedly connected to the inner surface of the fitting tube, wherein the toggle plate is arranged in an arc shape, the toggle plate is arranged in an elastic plate, the toggle plates are distributed at a fixed interval on the inner surface of the fitting tube, and a protrusion is fixedly connected to the outer surface of the mounting frame.

[0017] Preferably, an auxiliary groove is formed on the inner surface of the top of the sleeve, a bellows is fixedly connected to the bottom of the auxiliary groove, an extrusion ring is fixedly connected to the top of the bellows, and the extrusion ring is fixedly sleeved on the outer surface of the slide rod.

[0018] Preferably, an air pressure groove is provided on the top inner surface of the sleeve, and the air pressure groove is arranged above the auxiliary groove. The air pressure groove is communicated with the internal cavity of the corrugated tube, and a connecting groove is provided through the auxiliary groove. The outer surface of the slide rod is fixedly connected with a connecting ring, and the connecting ring is slidably connected in the air pressure groove. The outer surface of the connecting ring is fixedly connected with a moving tube through the connecting groove, and the outer surface of the moving tube is fixedly connected with a filter ring. If the automobile bolts need to be hot-dip galvanized, the slide rod can be pulled up along the top frame through an external hydraulic system, and then the zinc water is introduced into the processing cylinder, and then the automobile bolts are placed on the containing ring, wherein the head of the automobile bolts is placed upwards. After the placement is completed, the slide rod is driven downward by the hydraulic system, that is, the mounting frame containing the bolts is driven to move downward synchronously, and finally the bolts are immersed in the zinc water to complete the hot-dip galvanizing.

[0019] (III) Beneficial effects

[0020] The present invention provides a hot-dip galvanizing device for automobile bolt processing, which has the following beneficial effects:

[0021] (I) In the hot-dip galvanizing device for automobile bolt processing, when the slide bar moves down along the top frame, the sleeve at the bottom of the slide bar will gradually move down, and finally contact the upper surface of the limit ring at the bottom of the processing cylinder. At this time, with the obstruction of the limit ring, the sleeve is dislocated relative to the slide bar, that is, the slide bar continues to move down through the limit ring, and then drives the stabilizing frame to move down in the slide groove through the mounting ring, so that the stabilizing frame gradually approaches the containing ring, and finally moves to the bottom of the slide groove. At this time, the stabilizing frame is slightly higher than the containing ring, that is, the top of the containing ring is limited by the stabilizing frame, so that the bolt can move freely in the containing ring but cannot be separated from the containing ring. By limiting the activity space of the bolt, the bolt is non-fixedly loaded, thereby realizing all-round galvanizing operation of the bolt during hot-dip galvanizing, avoiding the problem that the fixed part of the bolt cannot be galvanized due to the existing direct fixed operation, and greatly improving the galvanizing quality.

[0022] (II) In the hot-dip galvanizing device for automobile bolt processing, when the installation ring moves to the bottom of the slide groove, the slide rod will continue to move downward under the drive of the hydraulic system. At this time, the extrusion force of the slide rod itself and the sleeve are greater than the elastic force of the slide ring, which will start to drive the slide ring to move downward in the installation groove. When the slide ring starts to move downward, it will simultaneously drive the fitting tube to move downward. When the fitting tube moves downward, due to the existence of the spiral strips, the fitting tube will rotate at the same time as the sliding ring moves downward through the spiral strips and the spiral grooves, and then the zinc in the processing cylinder will be pressed by the toggle plate on its inner surface. The water is stirred, and the zinc water is stirred through the toggle plate, thereby greatly increasing the contact area between the zinc water and the bolt, further improving the galvanizing effect, and the stirred zinc water will also act on the bolt. At this time, the toggle plate will intermittently contact the bumps on the surface of the mounting frame during the rotation process, thereby intermittently hitting the mounting frame. The combination of the two makes the bolt vibrate slightly in the containing ring, so that the outer surface of the bolt is in full contact with the zinc water to complete the galvanizing, further improving the galvanizing quality of the bolt and avoiding the problem of galvanizing dead corners.

[0023] (III) In the hot-dip galvanizing device for processing automobile bolts, when the slide bar is misaligned with the sleeve, the slide bar starts to squeeze the bellows through the squeezing ring. When the bellows is squeezed, its internal air pressure is transmitted to the air pressure groove, thereby pushing the connecting ring in the air pressure groove to move upward, so that the movable tube starts to move upward, and finally the filter ring moves upward. At the beginning, the filter ring has been immersed in the zinc water as the slide bar moves downward. At this time, when the filter ring moves upward, it will gradually float to the surface of the zinc water, thereby automatically collecting the oxides on the surface of the zinc water, and the excess zinc water re-enters the processing cylinder through the filter ring, thereby avoiding the problem of defective galvanized products caused by excessive oxides on the surface of the zinc water. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the processing cylinder of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the laminating tube of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the limiting ring of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the toggle plate of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the containing ring of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the bellows of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the mobile tube of the present invention.

[0032] In the figure: 1. processing cylinder; 2. top frame; 3. galvanizing mechanism; 31. sliding rod; 32. sleeve; 33. mounting frame; 34. holding ring; 35. sliding groove; 36. mounting ring; 37. stabilizing frame; 38. mounting groove; 39. sliding ring; 310. limiting ring; 4. strengthening mechanism; 41. fitting tube; 42. spiral strip; 43. spiral groove; 44. toggle plate; 45. bump; 46. auxiliary groove; 47. bellows; 48. extrusion ring; 49. air pressure groove; 410. connecting groove; 411. connecting ring; 412. moving tube; 413. filter ring. DETAILED DESCRIPTION

[0033] 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.

[0034] First embodiment: Figures 1 to 8 As shown, the present invention provides a technical solution: a hot-dip galvanizing device for processing automobile bolts, comprising a processing cylinder 1, a top frame 2 is fixedly connected to the top outer surface of the processing cylinder 1, wherein the top of the top frame 2 is arranged above the processing cylinder 1, and further comprising:

[0035] A galvanizing mechanism 3 is slidably mounted on the top frame 2;

[0036] A reinforcing mechanism 4, the reinforcing mechanism 4 is movably installed inside the processing cylinder 1;

[0037] The galvanizing mechanism 3 includes a slide bar 31, the top of which is slidably connected to the top of the top frame 2, wherein the slide bar 31 is driven by an external hydraulic device, and a sleeve 32 is elastically slidably sleeved on the bottom outer surface of the slide bar 31, wherein the bottom surface of the sleeve 32 and the bottom surface of the slide bar 31 are initially in the same horizontal plane, and a mounting frame 33 is fixedly connected to the outer surface of the sleeve 32, and a containing ring 34 is fixedly connected to the mounting frame 33, wherein three containing rings 34 are arranged in a group, and six groups of containing rings 34 are arranged at fixed intervals on the same mounting frame 33.

[0038] A slide groove 35 is formed through the outer surface of the bottom of the sleeve 32 . Six slide grooves 35 are arranged in a group. Three groups of slide grooves 35 are arranged at fixed intervals along the outer surface of the sleeve 32 , wherein three groups of slide grooves 35 are arranged between adjacent mounting frames 33 .

[0039] The outer surface of the sleeve 32 is slidably sleeved with a mounting ring 36, which is fixedly connected to the outer surface of the slide rod 31 through a slide groove 35. The outer surface of the mounting ring 36 is fixedly connected with a stabilizing frame 37, which is arranged directly above the containing ring 34, wherein the mounting ring 36 is initially arranged at the top of the slide groove 35.

[0040] A mounting groove 38 is provided on the inner surface of the bottom of the processing cylinder 1, and a sliding ring 39 is elastically slidably connected up and down in the mounting groove 38, wherein the elasticity of the sliding ring 39 is greater than the elasticity between the sliding rod 31 and the sleeve 32, and the inner side of the sliding ring 39 is fixedly connected to the limit ring 310 through a connecting rod.

[0041] The limiting ring 310 and the sliding ring 39 are arranged on the same central axis, and the upper surface of the limiting ring 310 only contacts the bottom surface of the sleeve 32 .

[0042] Second embodiment: Figures 1 to 8 As shown, the reinforcing mechanism 4 includes a fitting tube 41, the bottom surface of the fitting tube 41 is rotatably connected to the upper surface of the sliding ring 39, the outer surface of the fitting tube 41 is fitted on the top inner surface of the processing cylinder 1, the outer surface of the fitting tube 41 is fixedly connected with a spiral strip 42, the inner surface of the processing cylinder 1 is provided with a spiral groove 43, and the spiral strip 42 is fitted in the spiral groove 43.

[0043] The inner surface of the fitting tube 41 is fixedly connected with a toggle plate 44 , wherein the toggle plate 44 is configured as an arc, the toggle plate 44 is configured as an elastic plate, and the toggle plates 44 are distributed at a fixed interval on the inner surface of the fitting tube 41 , and the outer surface of the mounting frame 33 is fixedly connected with a protrusion 45 .

[0044] An auxiliary groove 46 is formed on the inner surface of the top of the sleeve 32 . A bellows 47 is fixedly connected to the bottom of the auxiliary groove 46 . An extrusion ring 48 is fixedly connected to the top of the bellows 47 . The extrusion ring 48 is fixedly sleeved on the outer surface of the slide rod 31 .

[0045] An air pressure groove 49 is provided on the top inner surface of the sleeve 32. The air pressure groove 49 is arranged above the auxiliary groove 46. The air pressure groove 49 is connected to the internal cavity of the bellows 47. A connecting groove 410 is provided through the auxiliary groove 46. A connecting ring 411 is fixedly connected to the outer surface of the slide rod 31. The connecting ring 411 is slidably connected in the air pressure groove 49. The outer surface of the connecting ring 411 is fixedly connected to a moving tube 412 through the connecting groove 410. The outer surface of the moving tube 412 is fixedly connected to a filter ring 413.

[0046] During operation, if the automobile bolts need to be hot-dip galvanized, the slide bar 31 can be pulled up along the top frame 2 through the external hydraulic system, and then the zinc water is introduced into the processing cylinder 1, and then the automobile bolts are placed on the containing ring 34, wherein the heads of the automobile bolts are placed upwards. After the placement is completed, the slide bar 31 is driven downward by the hydraulic system, that is, the mounting frame 33 for containing the bolts is driven to move downward synchronously, and finally the bolts are immersed in the zinc water to complete the hot-dip galvanizing. When the slide bar 31 moves downward along the top frame 2, the sleeve 32 at the bottom of the slide bar 31 will gradually move downward, and finally contact the upper surface of the limiting ring 310 at the bottom of the processing cylinder 1. At this time, with the obstruction of the limiting ring 310, the sleeve 32 is dislocated relative to the slide bar 31, that is, the slide bar 31 passes through the limiting ring 310 and then moves downward, and the processing is completed. The mounting ring 36 drives the stabilizing frame 37 to move downward in the slide groove 35, so that the stabilizing frame 37 gradually approaches the containing ring 34, and finally moves to the bottom of the slide groove 35. At this time, the stabilizing frame 37 is slightly higher than the containing ring 34, that is, the top of the containing ring 34 is limited by the stabilizing frame 37, so that the bolts can move freely in the containing ring 34 but cannot be separated from the containing ring 34. By limiting the activity space of the bolts, the bolts can be loaded in a non-fixed manner, thereby realizing a full-scale galvanizing operation on the bolts during hot-dip galvanizing, avoiding the problem that the existing direct fixed operation makes it impossible to galvanize the fixed parts of the bolts, and greatly improving the galvanizing quality. When the mounting ring 36 moves to the bottom of the slide groove 35, the sliding rod 31 will continue to move down under the drive of the hydraulic system. The sliding ring 39 is moved downwards, and the extrusion force of the sliding rod 31 and the sleeve 32 are greater than the elastic force of the sliding ring 39, which will start to drive the sliding ring 39 to move downwards in the installation groove 38. When the sliding ring 39 starts to move downwards, it will simultaneously drive the fitting tube 41 to move downwards. When the fitting tube 41 moves downwards, due to the existence of the spiral strips 42, the fitting tube 41 will rotate at the same time as the sliding ring 39 moves downwards through the spiral strips 42 and the spiral grooves 43, and then the zinc water in the processing cylinder 1 is stirred through the toggle plate 44 on its inner surface, so that the zinc water is stirred through the toggle plate 44, thereby greatly increasing the contact area between the zinc water and the bolt, further improving the galvanizing effect, and the stirred zinc water will also act on the bolt. At this time, the toggle plate 44 will intermittently contact with the bolt during the rotation process. The protrusion 45 on the surface of the mounting frame 33 contacts, thereby intermittently hitting the mounting frame 33. The combination of the two causes the bolt to vibrate slightly in the containing ring 34, so that the outer surface of the bolt is in full contact with the zinc water to complete the galvanizing, further improving the galvanizing quality of the bolt and avoiding the problem of galvanizing dead angles. When the slide bar 31 and the sleeve 32 are misaligned, the slide bar 31 begins to squeeze the bellows 47 through the squeezing ring 48. When the bellows 47 is squeezed, its internal air pressure is transmitted to the air pressure groove 49, thereby pushing the connecting ring 411 in the air pressure groove 49 to move upward, that is, the moving tube 412 starts to move upward, and finally the filter ring 413 moves upward. At the beginning, the filter ring 413 has been immersed in the zinc water as the slide bar 31 moves downward.At this time, when the filter ring 413 moves upward, it will gradually float on the surface of the zinc water, thereby automatically collecting the oxides on the surface of the zinc water, and the excess zinc water will re-enter the processing cylinder 1 through the filter ring 413, thereby avoiding the problem of galvanizing defective products caused by excessive oxides on the surface of the zinc water.

[0047] 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. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot-dip galvanizing device for processing automobile bolts, comprising a processing cylinder (1), characterized in that: The top outer surface of the processing cylinder (1) is fixedly connected to a top frame (2), and further comprises: A galvanizing mechanism (3), wherein the galvanizing mechanism (3) is slidably mounted on the top frame (2) up and down; A reinforcing mechanism (4), wherein the reinforcing mechanism (4) is movably mounted inside the processing cylinder (1); The galvanizing mechanism (3) comprises a slide bar (31), the top of the slide bar (31) is slidably connected to the top of the top frame (2), the outer surface of the bottom of the slide bar (31) is elastically slidably sleeved with a sleeve (32), the outer surface of the sleeve (32) is fixedly connected to a mounting frame (33), and the mounting frame (33) is fixedly connected to a containing ring (34); A slide groove (35) is formed through the outer surface of the bottom of the sleeve (32), and the slide groove (35) is arranged between adjacent mounting frames (33). A mounting ring (36) is slidably sleeved on the outer surface of the sleeve (32), and the mounting ring (36) is fixedly connected to the outer surface of the slide rod (31) through the slide groove (35). A stabilizing frame (37) is fixedly connected to the outer surface of the mounting ring (36), and the stabilizing frame (37) is arranged just above the containing ring (34), wherein the mounting ring (36) is initially arranged in the slide groove ( 35), a mounting groove (38) is provided on the inner surface of the bottom of the processing cylinder (1), a sliding ring (39) is elastically slidably connected up and down in the mounting groove (38), wherein the elasticity of the sliding ring (39) is greater than the elasticity between the sliding rod (31) and the sleeve (32), the inner side of the sliding ring (39) is fixedly connected to a limiting ring (310) via a connecting rod, the limiting ring (310) and the sliding ring (39) are arranged on the same central axis, and the upper surface of the limiting ring (310) only contacts the bottom surface of the sleeve (32).

2. The hot-dip galvanizing device for automobile bolt processing according to claim 1, characterized in that: The slide grooves (35) are arranged in groups of six, and three groups of the slide grooves (35) are arranged at fixed intervals along the outer surface of the sleeve (32).

3. The hot-dip galvanizing device for automobile bolt processing according to claim 2, characterized in that: The reinforcing mechanism (4) comprises a fitting tube (41), the bottom surface of the fitting tube (41) being rotatably connected to the upper surface of the sliding ring (39), the outer surface of the fitting tube (41) being fitted to the top inner surface of the processing cylinder (1), the outer surface of the fitting tube (41) being fixedly connected to a spiral strip (42), the inner surface of the processing cylinder (1) being provided with a spiral groove (43), and the spiral strip (42) being fitted in the spiral groove (43).

4. The hot-dip galvanizing device for automobile bolt processing according to claim 3, characterized in that: The inner surface of the fitting tube (41) is fixedly connected to a toggle plate (44), wherein the toggle plate (44) is arranged in an arc shape, the toggle plate (44) is arranged as an elastic plate, the toggle plates (44) are distributed at a fixed interval on the inner surface of the fitting tube (41), and the outer surface of the mounting frame (33) is fixedly connected to a protrusion (45).

5. The hot-dip galvanizing device for automobile bolt processing according to claim 4, characterized in that: An auxiliary groove (46) is formed on the inner surface of the top of the sleeve (32); a bellows (47) is fixedly connected to the bottom of the auxiliary groove (46); an extrusion ring (48) is fixedly connected to the top of the bellows (47); and the extrusion ring (48) is fixedly sleeved on the outer surface of the slide rod (31).

6. The hot-dip galvanizing device for automobile bolt processing according to claim 5, characterized in that: An air pressure groove (49) is provided on the inner surface of the top of the sleeve (32). The air pressure groove (49) is arranged above the auxiliary groove (46). The air pressure groove (49) is connected to the internal cavity of the bellows (47). A connecting groove (410) is provided in the auxiliary groove (46). A connecting ring (411) is fixedly connected to the outer surface of the sliding rod (31). The connecting ring (411) is slidably connected in the air pressure groove (49). The outer surface of the connecting ring (411) is fixedly connected to a moving tube (412) via the connecting groove (410). The outer surface of the moving tube (412) is fixedly connected to a filter ring (413).

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