Warp knitted fabric waterproof paint coating mechanism

Abstract

The invention discloses a warp knitting cloth waterproof paint coating mechanism which comprises a rack, a conveying belt used for conveying warp knitting cloth is installed on the rack in a transmission mode, a spraying frame is fixed to the rack and comprises outer baffles on the two sides, an upper baffle is fixed between the outer baffles on the two sides, and a lower baffle is fixed between the upper baffle and the lower baffle. A rotatable inner spraying shaft is installed in the upper baffle, spraying units are arrayed on the outer wall of the inner spraying shaft, a control frame is further arranged at the upper end of the inner spraying shaft, and the control frame is used for extruding the spraying units and cleaning spraying openings of the spraying units. When the spraying unit is located on the lower half layer, a waterproof material is sprayed out downwards, when the spraying unit rotates to the upper half layer, gas is sprayed outwards, when the spraying unit rotates to the upper half layer, the spraying unit extrudes an arc-shaped rod, gas is blocked by two sliding blocks when moving outwards along a spraying opening of a nozzle, and impurities around the spraying opening of the nozzle are blown away; the spraying speed is prevented from being reduced, and the nozzle or the spraying direction of the paint is prevented from being influenced.

Description

Technical Field

[0001] The invention relates to the technical field of material coating, in particular to a warp knitted fabric waterproof coating coating mechanism. Background Art

[0002] Warp knitted fabric is a base fabric made of polyester, polyamide and other materials. This base fabric itself may have certain strength and stability, but its waterproof performance may not be outstanding. Therefore, in order to enhance its waterproof performance, waterproof coating is usually used for coating. The main function of waterproof coating is to form a continuous waterproof layer on the surface of warp knitted fabric, thereby effectively blocking the penetration of water and moisture. After the waterproof coating is applied to the surface of the warp knitted fabric, a dense waterproof layer will be formed. This waterproof layer can effectively prevent the intrusion of water and moisture, and protect the internal structure and items from damage. The durability and service life of the warp knitted fabric treated with waterproof coating will be significantly improved. The waterproof layer can resist the erosion of the external environment, such as rain, wind and snow, thereby extending the service life of the warp knitted fabric.

[0003] Compared with other painting methods, spraying warp knitted fabrics can greatly improve construction efficiency and shorten construction period. Spraying can ensure that the waterproof coating forms a uniform and continuous coating on the surface of the warp knitted fabric, thereby improving the waterproof effect. Spraying is suitable for warp knitted fabrics of various shapes and sizes, especially for large-area, complex-shaped warp knitted fabrics. Spraying is more advantageous. However, during the spraying process of warp knitted fabrics, fluff dust is easily generated and adheres to the spraying equipment, which may clog the nozzle of the spraying equipment or affect the direction of the paint spraying, resulting in a slow spraying speed and reduced spraying efficiency. The nozzle of the spraying equipment needs to be cleaned regularly to avoid affecting the nozzle or affecting the direction of the paint spraying. Summary of the invention

[0004] The object of the present invention is to provide a warp knitted fabric waterproof coating coating mechanism to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a warp knitted fabric waterproof coating coating mechanism, comprising a frame, a conveyor belt for transmitting warp knitted fabric is installed on the frame, a spray rack is fixed on the frame, the spray rack comprises outer baffles on both sides, an upper baffle is fixed between the outer baffles on both sides, a rotatable inner spray shaft is installed in the upper baffle, a spray unit is arrayed on the outer wall of the inner spray shaft, and a control frame is also provided at the upper end of the inner spray shaft, and the control frame is used to squeeze the spray unit to clean the spray port of the spray unit.

[0006] Furthermore, the inner spraying shaft is rotatably installed between the outer baffles on both sides, a motor is fixed on the outer side of the outer baffle on one side, and driving gears are fixed on the output end of the motor and the inner spraying shaft, and the two driving gears are meshed with each other.

[0007] Furthermore, the control frame includes a cross bar and multiple arranged arc rods, the multiple arc rods are fixed on the cross bar, the axes of the multiple arc rods coincide with the axis of the inner spray shaft, the lower end of the arc rod has an opening, and the two ends of the cross bar are respectively fixed to the outer baffles on both sides.

[0008] Further, the spray unit comprises a nozzle fixed on the outside of the inner spray shaft, the outer side of the nozzle is fixedly sleeved with an outer ring sleeve, the outer ring sleeve is sleeved with a telescopic sleeve, and the end of the telescopic sleeve located inside the outer ring sleeve is fixed with a support spring;

[0009] The outer side of the telescopic sleeve is penetrated for nozzle spraying, and the side of the telescopic sleeve is also penetrated for cleaning impurities. Two sliders are arranged inside the telescopic sleeve, and the two sliders can open and close to block the nozzle. The rotating telescopic sleeve is squeezed by the arc rod to merge the two sliders.

[0010] Furthermore, a mounting opening is provided on the outside of the telescopic sleeve, and a push rod is hinged inside the mounting opening and on the outside of the slider. The push rod is used to push the slider to merge the two sliders, and the part of the push rod located at the mounting opening has a torsion spring for resetting.

[0011] Furthermore, a fixing bar is fixed on the outside of the nozzle, and the slider is slidably arranged on the outside of the fixing bar. There is a gap between the slider and the nozzle. When two sliders are combined, the gas moving outward from the nozzle is blocked by the slider, thereby achieving outward dispersion movement.

[0012] Furthermore, the contact position between the fixing bar and the sliding block is smoothly arranged.

[0013] Furthermore, symmetrically arranged limit blocks are fixed to the outer edge of the telescopic sleeve, and the limit blocks are used to limit the arc rod so that the arc rod is clamped between the limit blocks on both sides.

[0014] Further, a horizontal plate is arranged inside the inner spraying shaft, the horizontal plate is arranged horizontally and coincides with the axis of the inner spraying shaft, arc-shaped edges are fixed on both sides of the horizontal plate, the arc-shaped edges are fitted with the inner spraying shaft, and extension shafts are fixed on both ends of the horizontal plate, and the horizontal plate, the arc-shaped edges and the extension shaft separate the inner spraying shaft into two sealed parts, the upper and lower parts;

[0015] A plane layer is provided on the outer side of the extension shaft on both sides, and the plane layers of the extension shaft on both sides are respectively arranged up and down, and the upper and lower parts of the inner spray shaft are respectively connected to the outer sides of both ends through the plane layers. An outer sheet metal is fixed on the outer side of the extension shaft, and a through hole connected to the plane layer is provided on the outer sheet metal, and the outer sheet metal is fixed to the outer baffle.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] 1. When the rotating spray unit is located at the lower half layer, the waterproof material is sprayed downward. When it rotates to the upper half layer, the gas is ejected outward. When the spray unit rotates to the upper half layer, it is also squeezed with the arc rod. When the gas moves outward along the nozzle outlet, it is blocked by two sliders, blowing away the impurities around the nozzle outlet to avoid slowing down the spraying speed and affecting the nozzle or the direction of paint spraying.

[0018] 2. A fixing strip is provided. Firstly, it is convenient for the slider to slide along the fixing strip. Secondly, a gap is provided between the slider and the nozzle for gas to move outward. Generally, impurities also adhere to the edge of the nozzle orifice. The impurities can be blown away outward to avoid affecting the spraying of the nozzle orifice.

[0019] 3. The two sides of the horizontal plate are arc-shaped edges to prevent the upper and lower sides of the inner spray shaft from being connected at the same time under the action of the spray unit. The arc-shaped edges play a blocking role, increasing the squeezing effect with the inner wall of the inner spray shaft to avoid leakage on the upper and lower sides of the inner spray shaft. 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] FIG2 is a schematic diagram of the internal spraying shaft structure of the present invention;

[0023] FIG3 is a schematic diagram of the internal structure of an outer baffle on one side of the present invention;

[0024] FIG4 is a schematic diagram of the coordination structure of the control frame and the spray unit of the present invention;

[0025] FIG5 is a schematic diagram of the structure of the spray unit of the present invention;

[0026] FIG6 is a schematic diagram of the exploded structure of the spray unit of the present invention;

[0027] 7 is a schematic diagram of a partial cross-sectional structure of a spray unit according to the present invention;

[0028] FIG8 is a schematic diagram of a half-section structure of an internal spray-coated shaft according to the present invention;

[0029] FIG. 9 is a schematic diagram of the structure of the transverse plate and the arc-shaped end surface of the present invention.

[0030] In the figure: 1, frame; 2, conveyor belt; 3, spray frame; 31, outer baffle; 32, upper baffle; 33, inner spray shaft; 331, cross plate; 332, arc edge; 333, extension shaft; 334, plane layer; 335, outer sheet metal; 336, through hole; 34, control frame; 341, cross bar; 342, arc bar; 343, limit block; 35, spray unit; 351, nozzle; 352, outer ring; 353, telescopic sleeve; 354, support spring; 355, installation port; 356, fixing strip; 357, slider; 358, push rod; 359, torsion spring; 36, driving gear. 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] See also Figure 1 - Figure 9, the present invention provides a technical solution: In order to solve the problem that fluff dust adheres to the spraying equipment, which may block the nozzle 351 of the spraying equipment or affect the direction of the paint spraying, resulting in a slow spraying speed and a reduced spraying efficiency, a warp knitted fabric waterproof coating coating mechanism is proposed, such as Figure 1 The whole shown in FIG. 2 includes a frame 1, a conveyor belt 2 for conveying warp knitted fabric is installed on the frame 1, and the warp knitted fabric is conveyed on the conveyor belt 2. A spray rack 3 is fixed on the frame 1. The warp knitted fabric in transmission passes through the lower end of the spray rack 3, and a waterproof coating is coated on the warp knitted fabric to make the warp knitted fabric waterproof. In addition, the thickness of the waterproof coating is limited in one spraying, and spraying can be performed multiple times. The spray rack 3 shown in FIG. 2 is partially cut away, and the spray rack 3 includes outer baffles 31 on both sides, and an upper baffle 31 is fixed between the outer baffles 31 on both sides. The baffle 32, a rotatable inner spraying shaft 33 is installed in the upper baffle 32, and a spray unit 35 is arrayed on the outer wall of the inner spraying shaft 33. The inner spraying shaft 33 is located at the lower end of the upper baffle 32, and the lower end of the inner spraying shaft 33 is used for spraying the warp knitted fabric, and the rest of the position is blocked to prevent the waterproof coating from moving in different directions and affecting the environment. As shown in Figure 2, a control frame 34 is also provided at the upper end of the inner spraying shaft 33, and the control frame 34 is used to squeeze the spray unit 35 and clean the spray port of the spray unit 35.

[0033] As shown in Figure 3, it is necessary to drive the inner spray shaft 33 to rotate so that different spray units 35 are squeezed with the control frame 34 to clean different spray units 35. The inner spray shaft 33 is rotatably installed between the outer baffles 31 on both sides. A motor is fixed to the outside of the outer baffle 31 on one side. Drive gears 36 are fixed on the output end of the motor and the inner spray shaft 33. The two drive gears 36 are meshed with each other. The inner spray shaft 33 can realize rotation in the opposite direction of the transmission direction of the warp knitted fabric, so that the spraying on the warp knitted fabric is more uniform.

[0034] As shown in Figure 4, the structure of the control frame 34 includes a cross bar 341 and a plurality of arranged arc rods 342. The plurality of arc rods 342 are all fixed on the cross bar 341. The axes of the plurality of arc rods 342 coincide with the axis of the inner spray shaft 33. The lower end of the arc rod 342 has an opening. Both ends of the cross bar 341 are respectively fixed to the outer baffles 31 on both sides. When the inner spray shaft 33 rotates, the spray unit 35 is squeezed with the arc rod 342, and then rotates to the lower end to spray again, which is repeated continuously.

[0035] As shown in Figures 5, 6 and 7, the structure of the spray unit 35 is shown in Figures 5 and 6 as a whole. Figure 6 is a half-section of the telescopic sleeve 353. Figure 7 shows the cooperation between the outer sleeve 352 and the telescopic sleeve 353. The spray unit 35 includes a nozzle 351 fixed to the outside of the inner spray shaft 33. The outer sleeve 352 is fixedly sleeved on the outer side of the nozzle 351. The telescopic sleeve 353 is sleeved inside the outer sleeve 352. A support spring 354 is fixed to the end of the telescopic sleeve 353 located inside the outer sleeve 352. Under the extrusion of the spray unit 35 and the arc rod 342, the support spring 354 is compressed, and the telescopic sleeve 353 shrinks inward along the outer sleeve 352 to change the position of the telescopic sleeve 353. The outer side of the telescopic sleeve 353 is set to penetrate, and is used for spraying by the nozzle 351. The spraying along the nozzle 351 can penetrate the telescopic sleeve 353. The side of the telescopic sleeve 353 is also set to penetrate, and is used to clean impurities. When the telescopic sleeve 353 contracts, the two sliders 357 block the nozzle 351, and the gas moving out of the nozzle 351 will move outward along the surface of the slider 357 to clean the area around the nozzle 351. Two sliders 357 are provided inside the telescopic sleeve 353. The two sliders 357 can open and close, and are used to block the nozzle 351. The rotating telescopic sleeve 353 is squeezed by the arc rod 342, so that the two sliders 357 merge.

[0037] As shown in Figures 6 and 7, a mounting opening 355 is provided on the outside of the telescopic sleeve 353, and a push rod 358 is hinged inside the mounting opening 355 and on the outside of the slider 357. The push rod 358 is used to push the slider 357 to merge the two sliders 357. The part of the push rod 358 located at the mounting opening 355 has a torsion spring 359 for resetting. The telescopic sleeve 353 is telescopically extended inside and outside, which changes the inclination of the push rod 358, so that the two sliders 357 are closer to or farther away from each other, thereby blocking or opening the nozzle 351.

[0038] As shown in FIG6 , a fixing bar 356 is fixed to the outside of the nozzle 351, and a slider 357 is slidably arranged on the outside of the fixing bar 356. There is a gap between the slider 357 and the nozzle 351. When the two sliders 357 are combined, the gas moving outward from the nozzle 351 is blocked by the slider 357, realizing outward dispersion movement, and the gas is blown outward to blow away impurities on the nozzle 351.

[0039] The contact position between the fixing bar 356 and the sliding block 357 is smoothly set to achieve smooth sliding and avoid jamming.

[0040] As shown in Figure 6, the outer edge of the telescopic sleeve 353 is fixed with symmetrically arranged limit blocks 343, which are used to limit the arc rod 342 so that the arc rod 342 is clamped between the limit blocks 343 on both sides to avoid misalignment. The telescopic sleeve 353 is squeezed under the squeezing action of the arc rod 342.

[0041] As shown in Figures 8 and 9, there is a horizontal plate 331 inside the inner spraying shaft 33, the horizontal plate 331 is horizontally arranged and coincides with the axis of the inner spraying shaft 33, both sides of the horizontal plate 331 are fixed with arc edges 332, the arc edges 332 are in contact with the inner spraying shaft 33, and both ends of the horizontal plate 331 are fixed with extension shafts 333. The horizontal plate 331, the arc edges 332 and the extension shaft 333 separate the inner spraying shaft 33 into two upper and lower sealed parts, and the upper and lower sealed parts of the inner spraying shaft 33 are gas and waterproof coating respectively;

[0042] Planar layers 334 are provided on the outer sides of the extension shafts 333 on both sides, and the planar layers 334 of the extension shafts 333 on both sides are respectively arranged up and down, and the upper and lower parts of the inner spray shaft 33 are respectively connected to the outer sides of the two ends through the planar layers 334, and an outer sheet metal 335 is fixed on the outer side of the extension shaft 333, and a through hole 336 connected to the planar layer 334 is provided on the outer side of the outer sheet metal 335, and the outer sheet metal 335 is fixed to the outer baffle 31. During the rotation of the inner spray shaft 33, the upper and lower sealed parts remain stationary and are always located on the upper and lower sides. In addition, gas and waterproof coating can be introduced into the upper and lower sealed parts of the inner spray shaft 33 from the two ends of the inner spray shaft 33, so as to realize spraying and self-cleaning of the spray unit 35.

[0043] The working principle of the present invention is as follows: under the action of the motor, the inner spraying shaft 33 is driven to rotate, and the outer end of the inner spraying shaft 33 is connected to a pipe for conveying waterproof coating inward, and then moves out from the spray unit 35 under the action of pressure to spray the transmitted warp knitted fabric, thereby achieving the effect of waterproofing the warp knitted fabric.

[0044] During the rotation of the inner spray shaft 33, the horizontal plate 331 remains stationary, the upper half layer of the inner spray shaft 33 is gas introduced from one end, and the lower half layer is waterproof coating introduced from the other end, so that the upper layer of the horizontal plate 331 is gas, and the lower layer is waterproof material. When the rotating spray unit 35 is located in the lower half layer, the waterproof material is sprayed downward, and when it rotates to the upper half layer, the gas is ejected outward. When the spray unit 35 rotates to the upper half layer, it is also squeezed with the arc rod 342, so that the two sliders 357 of the spray unit 35 are close to each other, and the nozzle of the nozzle 351 is blocked, so that the gas is blocked by the two sliders 357 when it moves outward along the nozzle of the nozzle 351, so that the gas is dispersed and moves along the slider 357, and the impurities around the nozzle of the nozzle 351 are blown away, so as to avoid slowing down the spraying speed and avoiding affecting the nozzle 351 or affecting the direction of coating spraying.

[0045] During the above process, the spray unit 35 rotates and is squeezed by the arc rod 342, so that the telescopic sleeve 353 is squeezed into the outer ring sleeve 352, so that the push rod 358 is tilted more, so that the two sliders 357 are close to each other and fit together, and the nozzle 351 is blocked. When separated from the arc rod 342, the telescopic sleeve 353 is reset under the action of the support spring 354, and the push rod 358 is reset under the action of the torsion spring 359, and the nozzle 351 is opened to achieve the effect of spraying;

[0046] The fixing strip 356 is provided, firstly, to facilitate the sliding of the slider 357 along the fixing strip 356, and secondly, to allow a gap between the slider 357 and the nozzle 351 for gas to move outwards. When the outwardly extending surface of the nozzle 351 is blocked by the slider 357, there is a gap between the slider 357 and the nozzle 351, which allows gas to move outwards. Generally, impurities also adhere to the edge of the nozzle 351, so the impurities can be blown away outwards to avoid affecting the spraying of the nozzle 351.

[0047] When the inner spray shaft 33 rotates, the two sides of the cross plate 331 are arc-shaped edges 332, as shown in Figure 9, to avoid the upper and lower sides of the inner spray shaft 33 being connected at the same time under the action of the spray unit 35. The arc-shaped edges 332 play a blocking role and also increase the squeezing effect with the inner wall of the inner spray shaft 33 to avoid leakage from the upper and lower sides of the inner spray shaft 33. The two ends of the extension shaft 333 are outer sheet metal 335, which limit the cross plate 331 to avoid rotation with the inner spray shaft 33, thereby keeping the upper and lower layers of the inner spray shaft 33 stationary.

[0048] 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.

[0049] 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 warp knitted fabric waterproof coating coating mechanism, comprising a frame (1), on which a conveyor belt (2) for conveying the warp knitted fabric is installed, characterized in that: A spray rack (3) is fixed on the frame (1), the spray rack (3) comprising outer baffles (31) on two sides, an upper baffle (32) is fixed between the outer baffles (31) on the two sides, a rotatable inner spray shaft (33) is installed in the upper baffle (32), spray units (35) are arranged on the outer wall of the inner spray shaft (33), and a control frame (34) is also provided at the upper end of the inner spray shaft (33), the control frame (34) is used to squeeze the spray unit (35) to clean the spray port of the spray unit (35).

2. The warp knitted fabric waterproof coating coating mechanism according to claim 1, characterized in that: The inner spraying shaft (33) is rotatably mounted between the outer baffles (31) on both sides. A motor is fixed to the outside of the outer baffle (31) on one side. A driving gear (36) is fixed to the output end of the motor and the inner spraying shaft (33). The two driving gears (36) are meshed with each other.

3. The waterproof coating coating mechanism for warp knitted fabric according to claim 1, characterized in that: The control frame (34) comprises a crossbar (341) and a plurality of arranged arc-shaped rods (342), the plurality of arc-shaped rods (342) are fixed on the crossbar (341), the axes of the plurality of arc-shaped rods (342) coincide with the axis of the inner spraying shaft (33), the lower ends of the arc-shaped rods (342) have openings, and the two ends of the crossbar (341) are respectively fixed to the outer baffles (31) on both sides.

4. The warp knitted fabric waterproof coating coating mechanism according to claim 3, characterized in that: The spray unit (35) comprises a nozzle (351) fixed on the outside of the inner spray shaft (33); an outer sleeve (352) is fixedly sleeved on the outside of the nozzle (351); a telescopic sleeve (353) is sleeved inside the outer sleeve (352); a support spring (354) is fixed to the end of the telescopic sleeve (353) located inside the outer sleeve (352); The outer side of the telescopic sleeve (353) is provided with a through hole for the nozzle (351) to spray. The side of the telescopic sleeve (353) is also provided with a through hole for cleaning impurities. Two sliders (357) are provided inside the telescopic sleeve (353). The two sliders (357) can open and close to block the nozzle (351). The rotating telescopic sleeve (353) is squeezed with the arc rod (342) to merge the two sliders (357).

5. The warp knitted fabric waterproof coating coating mechanism according to claim 4, characterized in that: The outer side of the telescopic sleeve (353) is provided with a mounting opening (355), and a push rod (358) is hinged inside the mounting opening (355) and on the outer side of the slider (357). The push rod (358) is used to push the slider (357) so that two sliders (357) are combined. The part of the push rod (358) located at the mounting opening (355) has a torsion spring (359) for resetting.

6. The warp knitted fabric waterproof coating coating mechanism according to claim 5, characterized in that: A fixing strip (356) is fixed to the outside of the nozzle (351), and the slider (357) is slidably arranged on the outside of the fixing strip (356). A gap is provided between the slider (357) and the nozzle (351). When two sliders (357) are combined, gas moving outward from the nozzle (351) is blocked by the slider (357), thereby achieving outward dispersion movement.

7. The waterproof coating coating mechanism for warp knitted fabric according to claim 6, characterized in that: The contact position between the fixing bar (356) and the sliding block (357) is smoothly arranged.

8. The waterproof coating coating mechanism for warp knitted fabric according to claim 6, characterized in that: A symmetrically arranged limit stopper (343) is fixed to the outer edge of the telescopic sleeve (353), and the limit stopper (343) is used to limit the arc-shaped rod (342) so that the arc-shaped rod (342) is clamped between the limit stoppers (343) on both sides.

9. The warp knitted fabric waterproof coating coating mechanism according to claim 6, characterized in that: A horizontal plate (331) is disposed laterally inside the inner spraying shaft (33), the horizontal plate (331) is arranged horizontally and coincides with the axis of the inner spraying shaft (33), arc-shaped edges (332) are fixed on both sides of the horizontal plate (331), the arc-shaped edges (332) are in contact with the inner spraying shaft (33), and extension shafts (333) are fixed on both ends of the horizontal plate (331), and the horizontal plate (331), the arc-shaped edges (332) and the extension shaft (333) separate the inner spraying shaft (33) into two sealed upper and lower parts; Planar layers (334) are provided on the outer sides of the extension shafts (333) on both sides. The planar layers (334) of the extension shafts (333) on both sides are respectively arranged up and down. The upper and lower parts of the inner spray shaft (33) are respectively connected to the outer sides of both ends through the planar layers (334). An outer sheet metal (335) is fixed to the outer side of the extension shaft (333). A through hole (336) connected to the planar layer (334) is provided on the outer side of the outer sheet metal (335). The outer sheet metal (335) is fixed to the outer side of the extension shaft (333).

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