Spraying device for surface processing of curved skin

Abstract

The utility model relates to a spraying device for processing the surface of a curved surface skin, which comprises a base for placing a transmission mechanism for continuously conveying the curved surface skin, and a plurality of limiting mounting seats capable of positioning the curved surface skin are arranged on a conveyor belt of the transmission mechanism at intervals. A limiting protection shell capable of suspending a spraying assembly above the conveying belt is further supported on the base so that a machining space can be isolated on the base, and the conveying belt transversely penetrates through the limiting protection shell in the mode that the conveying belt can drive the curved surface skin to move into or out of the machining space. A pre-cleaning assembly capable of conducting dust removal and cleaning on the surface of the curved surface skin and a drying assembly for conducting drying and curing on the spraying film layer are further arranged in the limiting protection shell. According to the utility model, the spraying spacing distance can be adaptively adjusted, so that the spraying uniformity and the coating quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the skin surface processing equipment technical field especially, it relates to a kind of spraying device for curved skin surface processing. BACKGROUND

[0002] The aircraft skin is the key surface shaping part that maintains aircraft shape and constitutes aircraft aerodynamic shape. When the aircraft skin is processed, it needs to be cut, stamped, polished and sprayed, so that the aircraft skin has specific physical and chemical properties, corrosion resistance, ultraviolet aging resistance and thermal aging resistance, and also needs to meet the requirements of high adhesion and medium resistance. The role of the aircraft skin is to maintain the shape of the aircraft, so that it has good aerodynamic characteristics. After the skin is subjected to aerodynamic force, the force is transmitted to the connected fuselage wing skeleton, and the stress is complex. In addition, the skin directly contacts with the outside world, so it not only requires high strength and good plasticity of the skin material, but also requires smooth surface and strong corrosion resistance.

[0003] The aircraft skin is an important safety guarantee for aircraft flight. In the early production process, in order to improve the surface performance and smoothness, it is usually sprayed to improve the surface quality. The traditional spraying process is completed by manual operation, which is closely related to the operator's technical experience and state, and it is not easy to ensure the coating quality in batch processing. In addition, the coating molecules diffused in the air are also easily inhaled by the operator, which threatens the health of the personnel. In addition, the existing spraying tooling can only spray the flat surface, cannot uniformly spray the curved surface of the aircraft skin, cannot adjust the distance between the nozzle and the spraying area in real time according to the surface profile information of the curved skin, and the spraying interval changes with the change of the spraying point of the curved skin, which has the defect of poor coating distribution uniformity. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a spraying device for curved skin surface processing, which can adaptively adjust the spraying interval distance to improve the spraying uniformity and coating quality, to solve the problem that the existing spraying equipment cannot be effectively applied to curved skin, the spraying interval distance fluctuates greatly, the spraying uniformity is poor, the spraying thickness distribution deviation is obvious, and the overall spraying quality is poor.

[0005] The utility model adopts the technical scheme: a kind of spraying device for surface processing of curved skin, including the base of the transmission mechanism of the continuous conveying curved skin, several limiting mounting seats capable of positioning curved skin are arranged at intervals on the conveyor belt of the transmission mechanism, limiting protective shell capable of suspending spraying assembly above the conveyer belt is further supported on the base, to isolate processing space on the base, and the conveyer belt is transversely through the limiting protective shell in the mode that can drive curved skin to move into or move out processing space;Pre-cleaning assembly capable of dust cleaning the surface of curved skin and drying assembly for drying and curing spray film are further provided in the limiting protective shell.

[0006] According to a preferred embodiment, the spraying assembly includes a positioning mount, an elastic positioning mechanism, a spraying nozzle and a feeding module, wherein the positioning mount is mounted on the inner top surface of the limiting protective shell, and a plurality of the elastic positioning mechanisms are arranged side by side and spaced apart on the lower surface of the positioning mount, the spraying nozzle capable of adjusting the spraying height in real time by following the synchronous lifting is further connected on one side of the elastic positioning mechanism, and the spraying nozzle is in communication with the feeding module mounted on the positioning mount.

[0007] According to a preferred embodiment, the cylinder of the elastic positioning mechanism is supported on the lower surface of the positioning mount, and a positioning rod is movably inserted in the cylinder, and the elastic limiting member is sleeved on the rod body of the positioning rod in the cylinder cavity of the cylinder; a sealing filling ring is further arranged at the opening of the axial lower end of the cylinder to fill the assembly gap between the cylinder and the positioning rod.

[0008] According to a preferred embodiment, the feeding module includes a paint tank mounted on the positioning mount, a spraying pump arranged at the output end of the paint tank, and a telescopic feeding pipe mounted on the output port of the spraying pump and connected with the spraying nozzle.

[0009] According to a preferred embodiment, the suspended mounting plate of the positioning mount is suspended above the conveyer belt by the lifting positioning column capable of adjusting the initial working height thereof, and the axial upper end of the lifting positioning column is connected with the inner top surface of the limiting protective shell.

[0010] According to a preferred embodiment, the protective shell body of the limiting protective shell is supported on the base by a supporting column, and a through opening for the conveyer belt to pass through is opened at the two sides of the protective shell body in position, and a supporting plate for assisting to support the conveyer belt is further arranged in the protective shell body.

[0011] According to a preferred embodiment, a gas blowing unit capable of forming air curtain to assist in separating the internal and external environments of the shell cavity is further arranged on the opening upper edge of the through opening.

[0012] According to a preferred embodiment, the limiting mounting base comprises a seat body with a convex groove opened on the top surface and matched with the surface profile of the curved skin, and an extension auxiliary plate is arranged on the edge of the seat body and can be flat with the edge of the curved skin clamped in the convex groove.

[0013] According to a preferred embodiment, the dust collection strip port of the pre-cleaning assembly is suspended above the conveying belt through a first telescopic rod, and the dust collection strip port is also communicated with a dust collection unit arranged on the inner top surface of the protective shell through an air guide pipe.

[0014] According to a preferred embodiment, the drying assembly comprises a top heating plate and a side heating strip connected with the inner wall of the protective shell, and a flow guide fan is arranged between the top heating plate and the side heating strip to accelerate the contact between the hot air and the curved skin.

[0015] The beneficial effects of the utility model are:

[0016] The transmission mechanism can be matched with the limiting mounting base to move the spaced curved skin through the limiting protective shell in sequence to realize continuous spraying processing of the curved skin, reduce the influence of disassembly and spraying processing of the curved skin, and improve the comprehensive spraying efficiency.

[0017] The elastic positioning mechanism can abut against the surface of the curved skin, and can adaptively move up and down during the directional movement of the curved skin, so that the spraying nozzles on the elastic positioning mechanism can always maintain a relatively stable distance with the spraying area of the curved skin, so that the spraying diffusion range of the spraying nozzles on the curved skin and the spraying overlapping area of the multiple spraying nozzles arranged at intervals on the curved skin can be kept in a relatively stable state, the actual spraying coating thickness and uniformity can be kept in a proper and less fluctuating threshold range, and the smoothness and quality of the coating are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a preferred structure schematic view of the spraying device for curved skin surface processing provided by the utility model;

[0019] Fig. 2The utility model provides a kind of preferred structure schematic diagram of spraying assembly of spraying device for surface processing of curved skin.

[0020] Fig. 3 The utility model provides a kind of preferred lateral plane schematic diagram of drying assembly of spraying device for surface processing of curved skin.

[0021] List of reference signs

[0022] 1: base; 2: transmission mechanism; 3: limit mounting seat; 4: spraying assembly; 5: limit protection shell; 6: pre-cleaning component; 7: drying assembly; 21: conveyer belt; 31: seat body; 32: convex groove; 33: extension auxiliary plate; 41: positioning mounting frame; 42: elastic positioning mechanism; 43: spraying nozzle; 44: feeding module; 411: suspended mounting plate; 412: lifting positioning column; 421: column cylinder; 422: positioning rod; 423: elastic limit piece; 424: sealing filling ring; 425: idler; 426: auxiliary gusset; 427: mounting tail plate; 441: paint tank; 442: spraying pump; 443: telescopic feeding pipe; 51: protection shell; 52: support column; 53: support plate; 511: through hole; 512: air blowing unit; 61: dust suction strip mouth; 62: first telescopic rod; 63: air guide pipe; 64: dust suction unit; 71: top heating plate; 72: side heating strip; 73: flow guide fan. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the utility model will be briefly introduced with the description of the drawings and embodiments or prior art, and obviously, the following description of the structure of the drawings is only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor.

[0024] The technical scheme provided by the utility model will be described in detail by embodiment mode with reference to the drawings. It needs to be explained here that the explanation of these embodiment modes is used to help understanding the utility model, and does not constitute the limitation to the utility model. In some examples, since some embodiments belong to prior art or conventional technology, therefore, it is not described or not described in detail.

[0025] Furthermore, the features recited in the claims or all of the steps of the disclosed methods or processes can be combined in any suitable manner in one or more embodiments. It will be readily apparent to one of ordinary skill in the art that the order of steps or order of performing the steps of methods related to the embodiments described herein can be changed. Any sequence in the drawings and in the embodiments is for illustrative purposes only and is not a requirement, unless specifically stated otherwise.

[0026] The sequence numbers of the components described herein, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) under reasonable circumstances (not self-contradictory circumstances).

[0027] The detailed description will be made below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] The present application provides a spraying device for curved skin surface processing, which comprises a base 1, a transmission mechanism 2, a limiting mounting seat 3, a spraying assembly 4, a limiting protective shell 5, a pre-cleaning assembly 6 and a drying assembly 7.

[0030] According to Figs. 1-3In the shown specific embodiment, the base 1 is provided with a conveying mechanism 2 for continuously conveying the curved skin. A plurality of limiting mounting seats 3 capable of positioning the curved skin are arranged at intervals on the conveying belt 21 of the conveying mechanism 2. The base 1 is further supported with a limiting protective shell 5 capable of suspending the spraying assembly 4 above the conveying belt 21, so as to isolate a processing space on the base 1, and the conveying belt 21 transversely penetrates the limiting protective shell 5 in a manner capable of driving the curved skin to move into or out of the processing space. The spraying assembly 4 is capable of being lifted to abut the curved skin held by the limiting mounting seat 3 in a manner capable of adaptively adjusting the height to equivalently spray the continuously transversely moving curved skin. The limiting protective shell 5 is further provided with a pre-cleaning assembly 6 capable of dust cleaning the surface of the curved skin and a drying assembly 7 for drying and curing the sprayed film layer. The conveying mechanism 2 provided in the application can cooperate with the limiting mounting seat 3 to mobilize the curved skin arranged at intervals to sequentially penetrate the limiting protective shell 5, so as to realize the continuous spraying processing of the curved skin, reduce the influence of the curved skin disassembly operation and spraying processing, and improve the comprehensive spraying efficiency. The spraying assembly 4 provided in the application can adjust the spraying height in real time, so that the spraying interval will not change with the ups and downs of the curved skin to be sprayed, so as to ensure the stability of the spraying area size and the uniformity of the spraying thickness, thereby improving the adaptability of the spraying assembly 4 and the curved skin and the spraying quality, and effectively completing the spraying processing of the curved skin with uniform coating thickness. The application is further provided with the pre-cleaning assembly 6 to improve the surface cleanliness of the curved skin and improve the spraying effect. The application is further provided with the drying assembly 7 to accelerate the curing of the coating, so that the sprayed curved skin can be transferred in a short time, shorten the time required for drying and curing, and shorten the length of the comprehensive processing cycle.

[0031] Preferably, the conveying mechanism 2 is a conventional belt type conveying structure, and the transmission rollers are respectively supported on the two sides of the limiting protective shell 5, so that the conveying belt 21 sleeved on the transmission rollers can penetrate the limiting protective shell 5, and the curved skin held by the limiting mounting seat 3 on the conveying belt 21 can move through the limiting protective shell 5 to realize the spraying processing in the limiting protective shell 5.

[0032] Preferably, the limiting mounting base 3 comprises a seat body 31 with a convex groove 32 opened on the top surface and matched with the surface profile of the curved skin. Further preferably, an extension auxiliary plate 33 is arranged on the edge of the seat body 31 and can be flush with the edge of the curved skin clamped in the convex groove 32. The limiting mounting base 3 provided in the application can comprise an upper seat body and a lower mounting block, wherein the lower mounting block is connected with the conveying belt 21. The upper seat body can be replaced according to the requirements, so as to adaptively place the curved skin with different curvatures and realize the limiting placement of different curved skins. Further preferably, the upper seat body and the lower mounting block can be assembled and connected in the form of bolt connection or limiting clamping, magnetic attraction connection, etc. The convex groove 32 provided in the application is opened in the convex top surface of the seat body 31 in a manner matched with the actual size of the curved skin, so as to form a groove cavity matched with the curved skin. After the curved skin is embedded in the convex groove 32, the edge of the curved skin is flush with the edge of the groove cavity of the convex groove 32 and is adaptively clamped, so that the non-coating surface appears coating pollution in an effective manner. The extension auxiliary plate 33 provided in the application can provide support for the roller 425, so as to avoid the height of the elastic positioning mechanism 42 away from the surface of the curved skin from suddenly dropping and causing the spray nozzle 43 behind the elastic positioning mechanism 42 to be excessively shortened in the spray interval and to cause uneven spraying processing on the edge of the curved skin.

[0033] Preferably, the spraying assembly 4 comprises a positioning mounting bracket 41, an elastic positioning mechanism 42, a spraying nozzle 43 and a feeding module 44. Preferably, the positioning mounting bracket 41 is mounted on the inner top surface of the limiting protective shell 5. Further preferably, a plurality of elastic positioning mechanisms 42 capable of adaptively abutting against the curved skin are arranged side by side and spaced apart on the lower surface of the positioning mounting bracket 41. Preferably, the spraying nozzle 43 capable of synchronously lifting with the elastic positioning mechanism 42 to adjust the spraying height in real time is further connected on one side of the elastic positioning mechanism 42. Preferably, the spraying nozzle 43 is further communicated with the feeding module 44 mounted on the positioning mounting bracket 41. The elastic positioning mechanism 42 provided in the application can abut against the surface of the curved skin and can adaptively lift during the directional movement of the curved skin, so that the spraying nozzle 43 on the elastic positioning mechanism 42 can always maintain a relatively stable interval with the to-be-sprayed area of the curved skin, so that the spraying diffusion range of the spraying nozzle 43 on the curved skin and the overlapping area of the plurality of spraying nozzles 43 arranged at intervals on the curved skin are maintained in a relatively stable state, so as to ensure that the actual spraying coating thickness and uniformity can be within a proper and less fluctuating threshold range, thereby improving the smoothness and quality of the coating.

[0034] Preferably, the overhanging mounting plate 411 of the positioning mounting frame 41 is suspended above the conveying belt 21 by means of a lifting positioning column 412 capable of adjusting its initial working height. Preferably, the axial upper end of the lifting positioning column 412 is connected to the inner top surface of the limiting protective shell 5. Preferably, the lifting positioning column 412 can be selected from LC3 type or 5VT type vertical lifting columns. The lifting positioning column 412 provided in the present application can adjust the height of the overhanging mounting plate 411, so that the bottom end of the elastic positioning mechanism 42 can effectively abut against the surface of the curved skin within a suitable telescopic range, so as to ensure that the elastic positioning mechanism 42 with limited elastic lifting variation can effectively adapt to curved skins with different curvatures.

[0035] Preferably, the elastic positioning mechanism 42 comprises a cylinder 421, a positioning rod 422, an elastic limiting piece 423, a sealing filling ring 424, a roller 425, an auxiliary gusset 426 and a mounting tail plate 427. Preferably, the cylinder 421 is supported on the lower surface of the positioning mounting frame 41. Preferably, the positioning rod 422 is movably inserted in the cylinder 421. Further preferably, the elastic limiting piece 423 is sleeved on the rod body of the positioning rod 422 in the cylinder cavity of the cylinder 421. Preferably, the sealing filling ring 424 is further arranged at the axial lower end opening of the cylinder 421 to fill the assembly gap between the cylinder 421 and the positioning rod 422. Preferably, the positioning rod 422 is provided with a connecting ring plate connected with the lower end of the spring as the elastic limiting piece 423, and the upper end of the spring as the elastic limiting piece 423 is connected with the inner wall of the cylinder cavity of the cylinder 421. Preferably, the axial lower end of the positioning rod 422 is provided with a roller capable of rolling around the shaft to keep the elastic positioning mechanism 42 in contact with the surface of the curved skin while realizing the relative lateral movement between the elastic positioning mechanism 42 and the curved skin, so as to keep the curved skin in directional translation in the surface area directly below the spraying nozzle 43 and maintain a relatively stable distance between the spraying nozzle 43, so that the spraying range of the spraying nozzle 43 is kept relatively stable, so as to obtain a relatively uniform and moderate-thickness coating. Preferably, the side surface of the positioning rod 422 is connected with the mounting tail plate 427 for mounting the spraying nozzle 43, so that the spraying nozzle 43 can follow the synchronous lifting of the positioning rod 422 to maintain the spraying distance within a proper threshold range. The positioning rod 422 provided in the present application can drive the spraying nozzle 43 to synchronously lift during the lateral movement of the curved skin, so that the distance between the spraying nozzle 43 and the curved skin directly below it is always maintained within a relatively stable numerical range, so as to avoid too close or too far spraying distance, and avoid too small coverage area and too much coating amount or too large coverage area and high dispersion degree of the sprayed coating when the spraying range is expanded. By maintaining the spraying distance at a substantially equal height, the present application effectively maintains the stability of the spraying dispersion range of the coating output by the spraying nozzle 43, so as to obtain a coating with uniform thickness and appropriate overlapping spraying, and avoid the defects of ineffective spraying dispersion due to too small spraying distance and excessive dispersion due to too large spraying distance.

[0036] Preferably, the spraying nozzle 43 can be an ultrasonic atomization rectangular spraying nozzle or a four-pyramid cavity adjustable spray head. The spraying nozzle 43 and the elastic positioning mechanism 42 provided in the present application are arranged at equal intervals in the same way, so that the edge area with insufficient spraying thickness with respect to a single spraying nozzle 43 can be compensated for coating thickness by the mutual overlapping of multiple spraying areas, thereby improving the uniformity and flatness of the coating thickness.

[0037] Preferably, the supply module 44 comprises a paint tank 441 mounted on the positioning mount 41, a spray pump 442 arranged at the output end of the paint tank 441, and an extendable supply pipe 443 mounted on the output port of the spray pump 442 and connected with the spray nozzle 43. Preferably, the spray pump 442 can be selected as the ATMEL type spray pump of GRACO. The spray pump 442 arranged in the present application can controllably and continuously pressurize and deliver the paint, so that the paint can be stably output through the spray nozzle 43.

[0038] Preferably, the protective shell body 51 of the limiting protective shell 5 is supported on the base 1 through the support column 52. Preferably, through-holes 511 for the conveyer belt 21 to pass through are arranged on both sides of the protective shell body 51. Preferably, a support plate 53 for assisting in supporting the conveyer belt 21 is further arranged in the protective shell body 51. Preferably, a gas blowing unit 512 capable of forming a gas curtain to assist in separating the inner and outer environments of the shell cavity is further arranged on the opening edge of the through-hole 511. Preferably, the gas blowing unit 512 comprises an air inlet pump and an air outlet strip port connected with the air outlet end of the air inlet pump and arranged above the inner side of the through-hole 511 to form a gas curtain on the inner side of the through-hole 511. Preferably, the gas blowing unit 512 can be selected as the DLB-4A type high-pressure air blower.

[0039] Preferably, the dust suction strip port 61 of the pre-cleaning assembly 6 is suspended above the conveyer belt 21 through the first extendable rod 62. Preferably, the dust suction strip port 61 is further communicated with a dust suction unit 64 mounted on the inner top surface of the protective shell body 51 through the air guide pipe 63. In use, the first extendable rod 62 can adjust the distance between the dust suction strip port 61 and the moving curved skin by changing the length thereof, so that the dust and impurities on the surface of the curved skin can be effectively transferred by the air flow to achieve effective pre-cleaning of the spray surface of the curved skin. Preferably, the first extendable rod 62 can be a high-precision extendable positioning rod with the model number of KT-60C. Preferably, the dust suction unit 64 can be selected as the PT series industrial dust collector.

[0040] Preferably, the drying assembly 7 comprises a top heating plate 71 connected with the inner wall of the protective shell body 51 and a side heating strip 72, and a flow guide fan 73 for accelerating the contact between the hot air and the curved skin is further arranged between the top heating plate 71 and the side heating strip 72. Preferably, the top heating plate 71 and the side heating strip 72 can both be electric heating plates embedded with electric heating wires, and the heat generated by the two can flow directionally under the traction of the air flow generated by the flow guide fan 73 to perform drying treatment on the coating. Preferably, the flow guide fan 73 can be selected as the PRS-68A type flow guide fan with adjustable air speed.

[0041] Preferably, the lifting positioning column 412, the material spraying pump 442, the blowing unit 512, the first telescopic rod 62 and the dust suction unit 64, the drying assembly 7 and the like are electrically connected with the controller and the power supply, the control mode of the present application is controlled through the controller, the control circuit of the controller can be realized through simple programming of those skilled in the art, the provision of the power supply also belongs to the prior art, and the present application is only used to protect the mechanical device and the mechanical structure features, so the control mode and the circuit connection of the present application will not be explained in detail.

[0042] The utility model is not limited to the above optional implementation, anyone can draw other various forms of products under the inspiration of the utility model, but no matter make any change in its shape or structure, any technical scheme falling into the scope defined by the claims of the utility model falls within the protection scope of the utility model. Those skilled in the art should understand that the utility model specification and its drawings are all illustrative and not constitute the limitation of the claims. The protection scope of the utility model is defined by the claims and its equivalents. In the full text, the features guided by "preferably" are only optional ways and should not be understood as necessarily setting, so the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A spraying device for curved skin surface processing, comprising a base (1) arranged with a conveying mechanism (2) for continuously conveying a curved skin, characterized in that a plurality of limiting mounting seats (3) capable of positioning the curved skin are arranged at intervals on a conveying belt (21) of the conveying mechanism (2), a limiting protective shell (5) capable of suspending a spraying assembly (4) above the conveying belt (21) is further supported on the base (1) to isolate a processing space on the base (1), and the conveying belt (21) transversely penetrates the limiting protective shell (5) in a manner capable of moving the curved skin into or out of the processing space; a pre-cleaning assembly (6) capable of dust cleaning the surface of the curved skin and a drying assembly (7) capable of drying and curing the sprayed film layer are further arranged in the limiting protective shell (5). The spraying assembly (4) comprises a positioning mounting rack (41), an elastic positioning mechanism (42), a spraying nozzle (43) and a feeding module (44), wherein 2. A spray device for surfacing of curved skin surfaces according to claim 1, characterized in that the positioning mounting rack (41) is mounted on the inner top surface of the limiting protective shell (5), and a plurality of the elastic positioning mechanisms (42) are arranged side by side and at intervals on the lower surface of the positioning mounting rack (41), the spraying nozzle (43) capable of adjusting the spraying height in real time by following the synchronous lifting is further connected on one side of the elastic positioning mechanism (42), and the spraying nozzle (43) is in communication with the feeding module (44) mounted on the positioning mounting rack (41). The cylinder (421) of the elastic positioning mechanism (42) is supported on the lower surface of the positioning mounting rack (41), a positioning rod (422) is movably inserted in the cylinder (421), and an elastic limiting piece (423) is sleeved on the rod body of the positioning rod (422) in the cylinder cavity of the cylinder (421).

3. A spray device for surfacing of curved skin surfaces according to claim 2, characterized in that A sealing filling ring (424) is further arranged at the axial lower end opening of the cylinder (421) to fill the assembly gap between the positioning rod (422) and the cylinder (421). The feeding module (44) comprises a paint tank (441) mounted on the positioning mounting rack (41), a spraying pump (442) arranged at the output end of the paint tank (441), and a telescopic feeding pipe (443) mounted on the output port of the spraying pump (442) and connected with the spraying nozzle (43).

4. A spray device for surfacing of curved skin surfaces according to claim 3, characterized in that The suspended mounting plate (411) of the positioning mounting rack (41) is suspended above the conveying belt (21) by the lifting positioning column (412) capable of adjusting the initial working height thereof, 5. A spray device for surfacing of curved skin surfaces according to claim 4, characterized in that the axial upper end of the lifting positioning column (412) is connected with the inner top surface of the limiting protective shell (5). The protective shell body (51) of the limiting protective shell (5) is supported on the base (1) by the supporting column (52), and a through port (511) for the conveying belt (21) to pass through is oppositely arranged on both sides of the protective shell body (51), 6. A spray device for surfacing of curved skin surfaces according to claim 5, characterized in that a supporting plate (53) for assisting in supporting the conveying belt (21) is further arranged in the protective shell body (51). ​ 7. A spray device for surfacing of curved skin surfaces according to claim 6, characterized in that A blowing unit (512) capable of forming an air curtain to assist in separating the internal and external environments of the shell cavity is arranged on the opening edge of the through hole (511).

8. A spray device for surfacing of curved skin surfaces according to claim 7, characterized in that The limiting mounting seat (3) comprises a seat body (31) with a convex groove (32) opened on the top surface and matched with the surface profile of the curved skin, An extension auxiliary plate (33) capable of being flush with the edge of the curved skin clamped in the convex groove (32) is further arranged on the edge of the seat body (31).

9. A spray device for surfacing of curved skin surfaces according to claim 8, characterized in that The dust suction strip port (61) of the pre-cleaning assembly (6) is suspended above the conveying belt (21) through a first telescopic rod (62), and the dust suction strip port (61) is also communicated with a dust suction unit (64) installed on the inner top surface of the protective shell (51) through an air guide pipe (63).

10. A spray device for surfacing of curved skin surfaces according to claim 9, characterized in that The drying assembly (7) comprises a top heating plate (71) and a side heating strip (72) connected with the inner wall of the protective shell (51), and a flow guide fan (73) for accelerating the contact between hot air and the curved skin is further arranged between the top heating plate (71) and the side heating strip (72).

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