CN113578627B

CN113578627B - Automatic spraying room

Info

Publication number: CN113578627B
Application number: CN202110830603.4A
Authority: CN
Inventors: 迟海鹏; 张怀东; 邢希学; 张京军; 龚长华
Original assignee: Beijing Dynaflow Experiment Technology Co Ltd
Current assignee: Beijing Dynaflow Experiment Technology Co Ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-06-17
Anticipated expiration: 2041-07-22
Also published as: CN113578627A

Abstract

The invention provides an automatic spraying room which comprises a spraying room body, wherein a conveying device is arranged in the spraying room body, the conveying device penetrates through the left end and the right end of the spraying room body, the conveying device comprises a conveying belt, a plurality of fixing assemblies are arranged on the outer side wall of the conveying belt, an automatic spraying machine and a drying device are arranged in the spraying room body, the automatic spraying machine is arranged on the right side of the drying device, the automatic spraying machine is positioned on the rear side of the conveying belt, and the drying device is positioned above the conveying belt. According to the invention, the conveying belt and the automatic spraying machine are arranged in the spraying room body, the conveying belt can play a role of conveying workpieces, the automatic spraying machine is used for replacing manual spraying, labor is saved, the production efficiency and the production quality are improved, the health of operators is effectively protected, the conveying belt can convey the workpieces which are sprayed to the drying device, and the workpieces are dried by the drying device, so that the production efficiency is further improved.

Description

Automatic spraying room

Technical Field

The invention relates to the technical field of surface treatment, in particular to an automatic spraying room.

Background

Because the spraying is harmful to people or environment, in order to reduce the harm to the environment, the spraying is needed to be carried out in a special spraying room which is equipment for providing special environment for coating operation, and the requirements of the coating operation on temperature, humidity, illuminance, air cleanliness and the like can be met; can limit and treat the paint mist and organic waste gas generated in the paint spraying operation and then discharge the paint mist and the organic waste gas, and is environment-friendly coating equipment.

At present, the coating operation of a workpiece is mainly completed by manual operation, and an operator holds a spray gun to perform spraying treatment on the workpiece. But the mode that adopts manual work leads to coating to lose in the workshop at the spraying in-process easily, causes the pollution, influences that the operation personnel is healthy to, the work piece that the spraying finishes need dry the back and just can drop the production line, current spraying room and stoving room separately set up, not only can reduce production efficiency, set up the stoving room alone moreover and can occupy more land resources, cause the wasting of resources.

Disclosure of Invention

The invention provides an automatic spraying room, which is used for solving the technical problems that coating is easy to escape in a workshop in the spraying process by adopting a manual operation mode at present, so that pollution is caused, the health of operators is influenced, in addition, the sprayed workpiece can be off-line only after being dried, the existing spraying room and a drying room are separately arranged, the production efficiency can be reduced, and the resource waste is caused because the drying room is independently arranged, so that more land resources are occupied.

In order to solve the technical problem, the invention discloses an automatic spraying room, which comprises: the spraying room comprises a spraying room body, this internal conveyor that sets up of spraying room, conveyor runs through both ends about the spraying room body, conveyor includes the conveyer belt, the conveyer belt lateral wall sets up a plurality of fixed subassemblies, this internal automatic spraying machine and the drying device of being provided with of spraying room, the automatic spraying machine sets up the drying device right side, the automatic spraying machine is located the conveyer belt rear side, drying device is located the conveyer belt top.

Preferably, the side wall sets gradually first observation window and second observation window from left to right before the spraying room body, first observation window with second observation window department all sets up transparent explosion-proof glass, first observation window sets up drying device below, the second observation window is located automatic spraying machine dead ahead.

Preferably, the spraying room body right side wall sets up the feed inlet, feed inlet department sets up first baffle, first baffle upper end with feed inlet upper end inner wall is articulated to be connected, the spraying room body left side wall sets up the discharge gate, discharge gate department sets up the second baffle, second baffle upper end with discharge gate upper end inner wall is articulated to be connected.

Preferably, the outer wall of spraying room body right side sets up the forced draught blower, the forced draught blower pass through the intake pipe with the inside intercommunication of spraying room body, spraying room body left side outer wall sets up the exhaust fan, the exhaust fan pass through the blast pipe with the inside intercommunication of spraying room body.

Preferably, a plurality of the fixing assemblies are equidistantly distributed on the outer side wall of the conveyor belt, and each fixing assembly comprises:

the base is fixedly connected with the surface of the conveyor belt towards one side of the conveyor belt, a cavity is arranged in the base and penetrates through the upper surface of the base, first springs are arranged at four corners of the lower surface of the cavity, and one end of each first spring is fixedly connected with the lower surface of the cavity;

the supporting plate is arranged above the base, the lower surface of the supporting plate is fixedly connected with the upper end of the first spring, and the upper surface of the supporting plate is used for placing a workpiece to be processed;

the two limiting plates are symmetrically arranged on the left side and the right side of the upper surface of the supporting plate.

Preferably, set up vacuum generator in the cavity, vacuum generator one end sets up the connecting pipe, set up in the backup pad with the first through-hole of connecting pipe looks adaptation, both ends run through respectively about the first through-hole upper and lower both sides surface of backup pad, the connecting pipe is kept away from vacuum generator one end sets up in the first through-hole.

Preferably, the method further comprises the following steps:

the first rotating shaft is arranged in the cavity, and the left end and the right end of the first rotating shaft are respectively in rotating connection with the inner walls of the left side and the right side of the cavity;

the transverse plate is arranged on the outer wall of the base, a first motor is arranged on the upper surface of the transverse plate, and the output end of the first motor penetrates through the side wall of the base and is fixedly connected with one end of the first rotating shaft;

a cam disposed on the first shaft.

Preferably, the drying device includes:

the electric push rod is arranged on the inner wall of the upper side of the spraying room body;

the protective cover is arranged at the lower end of the electric push rod, the upper surface of the protective cover is fixedly connected with the lower end of the electric push rod, an opening is formed in the lower end of the protective cover, the opening is opposite to the supporting plate, and the diameter of the opening is larger than the length of the supporting plate;

the rotating ring is arranged inside the protective cover, a plurality of first sliding blocks are arranged on the outer side wall of the rotating ring, a sliding groove matched with the first sliding blocks is formed in the inner wall of the protective cover, the first sliding blocks slide along the inner wall of the sliding groove, the rotating ring can rotate in the protective cover through the matching of the first sliding blocks and the sliding groove, and annular ratchet teeth are arranged on the inner wall of the rotating ring;

the mounting plate is arranged on the lower surface of the rotating ring and is perpendicular to the lower surface of the rotating ring, and a heating wire is arranged on the mounting plate towards one side wall of the central axis of the protective cover;

the sliding rail is arranged on the inner wall of the upper end of the protective cover, a second sliding block is arranged on the lower side of the sliding rail in a sliding mode, a first connecting rod is arranged at one end, close to the rotating ring, of the second sliding block, a rectangular frame is arranged on the lower surface of the first connecting rod, a clamping block is arranged in the rectangular frame, the outer wall of the clamping block is connected with the inner wall of the rectangular frame in a sliding mode, the lower end of the clamping block extends to the position below the rotating ring, and the clamping block is matched with the ratchet teeth in shape towards one side of the ratchet teeth;

the second spring is arranged in the rectangular frame, one end of the second spring is fixedly connected with the inner wall of the rear side of the rectangular frame, and the other end of the second spring is fixedly connected with one side, away from the ratchet teeth, of the fixture block;

the second motor is arranged on the left side of the sliding rail, the upper end of the second motor is fixedly connected with the inner wall of the upper side of the protective cover, the lower end of the second motor is provided with an output shaft, a rotary table is arranged on the output shaft, a second rotating shaft is arranged on the lower surface of the rotary table, and one end of the second rotating shaft is rotatably connected with the eccentric position of the lower surface of the rotary table;

the second connecting rod, the second connecting rod sets up the carousel below, second connecting rod one end with the second pivot is kept away from carousel one end is rotated and is connected, the second connecting rod other end sets up the third pivot, third pivot one end with the second connecting rod upper surface is rotated and is connected, the third pivot other end with the first connecting rod lower surface is rotated and is connected.

Preferably, the method further comprises the following steps:

the air pressure sensor is arranged in the connecting pipe and used for detecting the actual air pressure in the connecting pipe;

the pressure detection device is arranged at a nozzle of the automatic spraying machine and used for detecting the spraying pressure of the automatic spraying machine;

the first controller is arranged on the outer wall of the base and is electrically connected with the air pressure sensor, the pressure detection device and the vacuum generator respectively;

the first controller controls the vacuum generator to work based on the detection values of the pressure detection device and the air pressure sensor, and comprises the following steps:

step 1: based on the detection value of the pressure detection means, a target air pressure within the connection pipe is calculated by the following formula:

wherein, P₁Is a target air pressure, P, in the connecting tube₂The spraying pressure of the automatic spraying machine detected by the pressure detection device S₂When the automatic spraying machine sprays, the area of the side wall of the workpiece on the supporting plate is mu, the coefficient of friction of the upper surface of the supporting plate is m₁G is the weight of the workpiece on the supporting plate, g is the acceleration of gravity, and g is 9.8m/s²，S₁Is the radial cross-sectional area of the first through-hole;

step 2: based on the step 1, the first controller controls the vacuum generator to work, so that the actual air pressure in the connecting pipe detected by the air pressure sensor is larger than the target air pressure in the connecting pipe.

Preferably, the method further comprises the following steps:

the dust collector is arranged on the inner wall of the upper side of the spraying room body, the dust collector is aligned to the upper surface of the conveying belt and is provided with a dust hood, and the lower end of the dust hood is opposite to the spraying position of the automatic spraying machine;

the particle detection device is arranged on the inner wall of the spraying room body and can detect the density of gas generated in the spraying process of the automatic spraying machine after the paint particles are mixed with air;

the first speed detection device is arranged on the automatic spraying machine and used for detecting the rebounding speed of the coating sprayed by the automatic spraying machine after the coating impacts the spraying surface;

the second speed detection device is arranged at the nozzle of the automatic coating machine and is used for detecting the initial speed of the coating sprayed by the automatic coating machine;

the pressure intensity detection device is arranged at the cover opening of the dust hood and is used for detecting the suction pressure intensity at the cover opening of the dust hood;

the position setting and selecting of the dust hood comprises the following steps:

step 11: calculating a target distance from a cover opening of the dust hood to a spraying surface of the automatic spraying machine according to a formula (1) according to a detection value of the particle detection device:

wherein L is₁Is the target distance, v, from the hood opening of the suction hood to the spray surface of the automatic spray coater₁The rebound speed t of the coating sprayed by the automatic coating machine after impacting the sprayed surface is detected by the first speed detection device₁For the preset operating time, P, of the vacuum cleaner₁The suction pressure at the opening of the dust hood detected by the pressure intensity detection device is pi, which is the circumferential rate and is 3.14, r₁Is the particle radius of the coating particles sprayed by the automatic spraying machine, m is the single particle mass of the coating particles sprayed by the automatic spraying machine, g is the gravity acceleration, and g is 9.8m/s²Rho is the gas density of the coating particles and air mixed in the spraying process of the automatic spraying machine, which is detected by the particle detection device, v₂The initial speed of the coating sprayed out of the automatic coating machine is detected by the second speed detection device, and C is a fluid resistance coefficient of the coating particles in the flowing process;

step 12: calculating a target circumference of a cover opening of the dust hood by formula (2) based on a calculation result of formula (1):

wherein L is₂Is the target perimeter, Q, of the hood opening of the suction hood₁The rated air volume of the dust collector;

step 13: based on the calculation result of the formula (1), setting the actual distance from the cover opening of the dust hood to the spraying surface of the automatic spraying machine according to the target distance from the cover opening of the dust hood to the spraying surface of the automatic spraying machine, enabling the actual distance to be smaller than or equal to the target distance, and selecting the dust hood according to the calculation result of the formula (2), so that the actual circumference of the cover opening of the dust hood is larger than or equal to the target circumference of the cover opening of the dust hood.

The technical scheme of the invention has the following advantages: the invention provides an automatic spraying room which comprises a spraying room body, wherein a conveying device is arranged in the spraying room body, the conveying device penetrates through the left end and the right end of the spraying room body, the conveying device comprises a conveying belt, a plurality of fixing assemblies are arranged on the outer side wall of the conveying belt, an automatic spraying machine and a drying device are arranged in the spraying room body, the automatic spraying machine is arranged on the right side of the drying device, the automatic spraying machine is positioned on the rear side of the conveying belt, and the drying device is positioned above the conveying belt. According to the invention, the conveying belt and the automatic spraying machine are arranged in the spraying room body, the conveying belt can play a role of conveying workpieces, the automatic spraying machine is used for replacing manual spraying, labor is saved, the production efficiency and the production quality are improved, the health of operators is effectively protected, the conveying belt can convey the workpieces which are sprayed to the drying device and the workpieces are dried by the drying device, the production efficiency is further improved, the drying room is not required to be independently arranged for drying, and land resources are saved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the apparatus particularly pointed out in the written description and drawings thereof.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of an automatic spray booth according to the present invention;

FIG. 2 is a schematic view of the exterior structure of the spraying booth body according to the present invention;

FIG. 3 is a schematic view of the drying apparatus in a drying position according to the present invention;

FIG. 4 is a top view of the base of the present invention;

FIG. 5 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;

FIG. 6 is an enlarged view of the invention at B of FIG. 1;

fig. 7 is a bottom view of the drying apparatus of the present invention.

In the figure: 1. a spraying room body; 2. a conveyor belt; 3. an automatic spraying machine; 4. a first observation window; 5. a second observation window; 6. a feed inlet; 7. a first baffle plate; 8. a discharge port; 9. a second baffle; 10. a blower; 11. an air inlet pipe; 12. an exhaust fan; 13. an exhaust pipe; 14. a base; 15. a cavity; 16. a first spring; 17. a support plate; 18. a limiting plate; 19. a vacuum generator; 20. a connecting pipe; 21. a first through hole; 22. a first rotating shaft; 23. a transverse plate; 24. a first motor; 25. a cam; 26. an electric push rod; 27. a protective cover; 28. a rotating ring; 29. a first slider; 30. a chute; 31. ratchet teeth; 32. mounting a plate; 33. heating wires; 34. a slide rail; 35. a second slider; 36. a first link; 37. a rectangular frame; 38. a clamping block; 39. a second spring; 40. a second motor; 41. a turntable; 42. a second rotating shaft; 43. a second link; 44. a third rotating shaft; 45. a vacuum cleaner; 46. a dust hood.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In addition, the descriptions related to "first", "second", etc. in the present invention are used for descriptive purposes only, do not specifically refer to an order or sequence, and do not limit the present invention, but merely distinguish components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between the various embodiments may be combined with each other, but must be based on the realization of the capability of a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Example 1:

an embodiment of the present invention provides an automatic spray booth, as shown in fig. 1 to 7, including: spraying room body 1, this internal conveyor that sets up of spraying room, conveyor runs through both ends about spraying room body 1, conveyor includes

conveyer belt

2, 2 lateral walls of conveyer belt set up a plurality of fixed subassemblies, this internal automatic spraying machine 3 and the drying device of being provided with of spraying room, automatic spraying machine 3 sets up the drying device right side, automatic spraying machine 3 is located 2 rear sides of conveyer belt, drying device is located 2 tops of conveyer belt.

The working principle and the beneficial effects of the technical scheme are as follows: during operation, a workpiece is placed on a fixing component of a conveyor belt 2, the workpiece is fixed by the fixing component, the workpiece is prevented from moving to influence spraying quality during spraying, then the conveyor belt 2 is used for conveying the workpiece to an automatic spraying machine 3, spraying is automatically finished by the automatic spraying machine 3, the sprayed workpiece is conveyed to the lower part of a drying device by the conveyor belt 2, the workpiece is dried by the drying device, finally, the conveyor belt 2 conveys the dried workpiece to the outer part of a spraying room body 1, finished workpiece unloading is finished, because the conveyor belt 2 and the automatic spraying machine 3 are arranged in the spraying room body 1, the conveyor belt 2 can play a role of conveying the workpiece, the fixing component is arranged on the conveyor belt 2, the workpiece can be fixed by the fixing component, the workpiece is prevented from shaking, the spraying quality is improved, manual spraying is replaced by the automatic spraying machine 3, and labor is saved, production efficiency and production quality are improved, the health of operating personnel is effectively protected, the conveying belt 2 can convey the workpiece after spraying to the drying device, the workpiece is dried by the drying device, production efficiency is further improved, a drying room is not required to be independently arranged for drying, and land resources are saved.

Example 2

On the basis of the embodiment 1, as shown in fig. 2, the front side wall of the spray booth body 1 is sequentially provided with a first observation window 4 and a second observation window 5 from left to right, the first observation window 4 and the second observation window 5 are both provided with transparent explosion-proof glass, the first observation window 4 is arranged below the drying device, and the second observation window 5 is positioned right in front of the automatic spray coater 3.

The working principle and the beneficial effects of the technical scheme are as follows: the lateral wall sets up first observation window 4 and second observation window 5 respectively before the spraying room, uses the stoving state of first observation window 4 work piece of being convenient for observe, uses the spraying progress of second observation window 5 work piece of being convenient for observe, and first observation window 4 all adopts transparent explosion-proof glass with second observation window 5, has improved the quality of first observation window 4 with second observation window 5, has prolonged life.

Example 3

On

embodiment

1 or 2 basis, as shown in fig. 1, the wall sets up feed inlet 6 in the 1 right side of spray booth body, feed inlet 6 department sets up first baffle 7, first baffle 7 upper end with the articulated connection of the 6 upper end inner walls of feed inlet, the wall sets up discharge gate 8 in the 1 left side of spray booth body, discharge gate 8 department sets up second baffle 9, second baffle 9 upper end with the articulated connection of the 8 upper end inner walls of discharge gate.

The working principle and the beneficial effects of the technical scheme are as follows: set up feed inlet 6 on 1 right side of spraying room body, set up discharge gate 8 in 1 left side of spraying room body, conveyer belt 2 can drive the work piece and follow feed inlet 6 and get into 1 inside then processing of spraying room body, processing finishes after conveyer belt 2 and carries the work piece to 1 outside of spraying room body from discharge gate 8, through setting up first baffle 7 and second baffle 9, can prevent that 1 inside some dust in spraying room body from giving out spraying room body 1 outside, thereby reduce the pollution of spraying to external environment.

Example 4

On the basis of any one of embodiments 1-3, as shown in fig. 1, the outer wall of the right side of the spraying room body 1 is provided with a blower 10, the blower 10 is communicated with the inside of the spraying room body 1 through an air inlet pipe 11, the outer wall of the left side of the spraying room body 1 is provided with an exhaust fan 12, and the exhaust fan 12 is communicated with the inside of the spraying room body 1 through an exhaust pipe 13.

The working principle and the beneficial effects of the technical scheme are as follows: be provided with forced draught blower 10 at 1 right side outer wall of spraying room body, can carry the fresh air of 1 outside of spraying room body to inside of spraying room body 1 through forced draught blower 10, be provided with exhaust fan 12 at 1 left side outer wall of spraying room body, can carry the harmful gas of 1 inside of spraying room body to the 1 outside of spraying room body through exhaust fan 12, still be provided with filter equipment in exhaust fan 12 department, can filter the combustion gas through filter equipment, reduce the pollution degree, through setting up forced draught blower 10 and exhaust fan 12, the inside circulation of air of spraying room body 1 has been guaranteed, the harm of the harmful substance that the spraying produced has been reduced, effectively protect that the staff is healthy.

Example 5

On the basis of any one of embodiments 1-4, as shown in fig. 1, 4, and 5, a plurality of fixing assemblies are equidistantly distributed on the outer side wall of the conveyor belt 2, and each fixing assembly includes:

the base 14 is fixedly connected with the surface of the conveyor belt 2 towards one side of the conveyor belt 2, a cavity 15 is arranged in the base 14, the cavity 15 penetrates through the upper surface of the base 14, four corners of the lower surface of the cavity 15 are respectively provided with a first spring 16, and one end of each first spring 16 is fixedly connected with the lower surface of the cavity 15;

the supporting plate 17 is arranged above the base 14, the lower surface of the supporting plate 17 is fixedly connected with the upper end of the first spring 16, and the upper surface of the supporting plate 17 is used for placing a workpiece to be processed;

the two limiting plates 18 are symmetrically arranged on the left side and the right side of the upper surface of the supporting plate 17.

The working principle and the beneficial effects of the technical scheme are as follows: when the work piece needs the spraying, place the work piece on backup pad 17, the work piece is located between two limiting plates 18, the removal about having restricted the work piece, it is firm to make the work piece place, the work piece lower extreme can use bolt or all the other detachable connected modes to be connected with backup pad 17, make the work piece firm the installation in backup pad 17 upper surface, install the work piece behind backup pad 17, can start conveyer belt 2, when conveyer belt 2 drives the work piece and reachs the 3 positions of automatic spraying machine, accomplish the spraying by automatic spraying machine 3, be provided with cavity 15 in the base 14, set up a plurality of first spring 16 in the cavity 15, pulling force through first spring 16 can make backup pad 17 lower surface and the firm contact of base 14 upper end, thereby support for the work piece provides.

Example 6

On the basis of embodiment 5, as shown in fig. 5, a vacuum generator 19 is disposed in the cavity 15, a connecting pipe 20 is disposed at one end of the vacuum generator 19, a first through hole 21 adapted to the connecting pipe 20 is disposed in the supporting plate 17, upper and lower ends of the first through hole 21 respectively penetrate through upper and lower side surfaces of the supporting plate 17, and an end of the connecting pipe 20, which is far away from the vacuum generator 19, is disposed in the first through hole 21.

The working principle and the beneficial effects of the technical scheme are as follows: be provided with vacuum generator 19 in cavity 15, vacuum generator 19 is provided with connecting pipe 20, and connecting pipe 20 one end sets up in the first through-hole 21 of backup pad 17, places the work piece back on backup pad 17, starts vacuum generator 19, and vacuum generator 19 work makes connecting pipe 20 one end produce suction to adsorb the work piece on backup pad 17 upper surface, further improved the stability of work piece, help improving product quality.

Example 7

On the basis of

embodiment

5 or 6, as shown in fig. 5, the method further includes:

the first rotating shaft 22 is arranged in the cavity 15, and the left end and the right end of the first rotating shaft 22 are respectively in rotating connection with the inner walls of the left side and the right side of the cavity 15;

the transverse plate 23 is arranged on the outer wall of the base 14, a first motor 24 is arranged on the upper surface of the transverse plate 23, and the output end of the first motor 24 penetrates through the side wall of the base 14 and is fixedly connected with one end of the first rotating shaft 22;

a cam 25, wherein the cam 25 is arranged on the first rotating shaft 22.

The working principle and the beneficial effects of the technical scheme are as follows: when the work piece reachd drying device department, start first motor 24, first motor 24 rotates and to drive first pivot 22 and rotate, and first pivot 22 can drive cam 25 and rotate, can drive backup pad 17 when cam 25 rotates and carry out up-and-down reciprocating motion, and backup pad 17 drives the work piece up-and-down motion to the heat that produces when fully receiving the stoving can accelerate drying device to the work piece, has further improved production efficiency.

Example 8

On the basis of embodiment 7, as shown in fig. 1 to 7, the drying apparatus includes:

the electric push rod 26 is arranged on the inner wall of the upper side of the spraying room body 1;

the protective cover 27 is arranged at the lower end of the electric push rod 26, the upper surface of the protective cover 27 is fixedly connected with the lower end of the electric push rod 26, an opening is formed in the lower end of the protective cover 27, the opening is opposite to the supporting plate 17, and the diameter of the opening is larger than the length of the supporting plate 17;

the rotating ring 28 is arranged inside the protective cover 27, a plurality of first sliding blocks 29 are arranged on the outer side wall of the rotating ring 28, a sliding groove 30 matched with the first sliding blocks 29 is arranged on the inner wall of the protective cover 27, the plurality of first sliding blocks 29 slide along the inner wall of the sliding groove 30, the rotating ring 28 can rotate in the protective cover 27 through the matching of the first sliding blocks 29 and the sliding groove 30, and annular ratchet teeth 31 are arranged on the inner wall of the rotating ring 28;

the mounting plate 32 is arranged on the lower surface of the rotating ring 28, the mounting plate 32 is perpendicular to the lower surface of the rotating ring 28, and the mounting plate 32 is provided with a heating wire 33 towards one side wall of the central axis of the protective cover 27;

the slide rail 34 is arranged on the inner wall of the upper end of the protective cover 27, a second slide block 35 is arranged on the lower side of the slide rail 34 in a sliding manner, a first connecting rod 36 is arranged at one end, close to the rotating ring 28, of the second slide block 35, a rectangular frame 37 is arranged on the lower surface of the first connecting rod 36, a clamping block 38 is arranged in the rectangular frame 37, the outer wall of the clamping block 38 is connected with the inner wall of the rectangular frame 37 in a sliding manner, the lower end of the clamping block 38 extends to the lower side of the rotating ring 28, and the clamping block 38 is matched with the ratchet teeth 31 in tooth shape towards one side of the ratchet teeth 31;

the second spring 39 is arranged in the rectangular frame 37, one end of the second spring 39 is fixedly connected with the inner wall of the rear side of the rectangular frame 37, and the other end of the second spring 39 is fixedly connected with one side, away from the ratchet teeth 31, of the fixture block 38;

the second motor 40 is arranged on the left side of the slide rail 34, the upper end of the second motor 40 is fixedly connected with the inner wall of the upper side of the protective cover 27, the lower end of the second motor 40 is provided with an output shaft, the output shaft is provided with a rotating disc 41, the lower surface of the rotating disc 41 is provided with a second rotating shaft 42, and one end of the second rotating shaft 42 is rotatably connected with the eccentric position of the lower surface of the rotating disc 41;

second connecting rod 43, second connecting rod 43 sets up carousel 41 below, second connecting rod 43 one end with second pivot 42 is kept away from carousel 41 one end is rotated and is connected, the second connecting rod 43 other end sets up third pivot 44, third pivot 44 one end with second connecting rod 43 upper surface rotates and is connected, the third pivot 44 other end with first connecting rod 36 lower surface rotates and is connected.

The working principle and the beneficial effects of the technical scheme are as follows: when the workpiece is conveyed to the lower part of the drying device by the conveyor belt 2, the electric push rod 26 is started, the electric push rod 26 drives the protective cover 27 to move downwards, the protective cover 27 is covered outside the workpiece and the fixed component (as shown in fig. 3), then the heating wire 33 arranged on the mounting plate 32 is started, the heating wire 33 is electrically heated, the temperature can be rapidly raised, a large amount of heat can be generated, the heat generated by the heating wire 33 can dry the surface of the workpiece, then the second motor 40 is started, the second motor 40 can drive the rotating disc 41 to rotate, the rotating disc 41 can drive the second connecting rod 43 to move through the second rotating shaft 42, the second connecting rod 43 can drive the first connecting rod 36 to move through the third rotating shaft 44, because the first connecting rod 36 is connected with one end of the second sliding block 35, the second sliding block 35 slides on the sliding rail 34, therefore, the first connecting rod 36 can linearly reciprocate from side to side in the protective cover 27 under the drive of the second connecting rod 43, a rectangular frame 37 is arranged on the lower surface of the first connecting rod 36, a clamping block 38 is arranged in the rectangular frame 37, the clamping block 38 can slide along the inner wall of the rectangular frame 37, the clamping block 38 is arranged in the rectangular frame 37 through a second spring 39, a rotating ring 28 is arranged below the rectangular frame 37, the rotating ring 28 can rotate in the protective cover 27 through the matching of the first sliding block 29 and the sliding chute 30, ratchet teeth 31 are also arranged on the inner wall of the rotating ring 28, the clamping block 38 extends to the inner wall of the rotating ring 28 and is provided with a tooth shape matched with the ratchet teeth 31, the first connecting rod 36 can drive the rectangular frame 37 to reciprocate left and right through reciprocating motion, when the first connecting rod 36 moves left and right, the clamping block 38 slides left along the ratchet and falls into the ratchet teeth 31 on the left, under the action of the second spring 39, the clamping block 38 is clamped with the ratchet, in the process, the rotating ring 28 does not rotate, when the first connecting rod 36 moves right, the first connecting rod 36 drives the rectangular frame 37 to move from left to right, the rectangular frame 37 drives the clamping block 38 to move from left to right, the clamping block 38 can drive the rotating ring 28 to rotate in an equal-angle intermittent manner through the clamping with the ratchet teeth 31, the rotating ring 28 drives the heating wire 33 to rotate in an equal-angle intermittent manner through the mounting plate 32, so that the heating wire 33 can rotate around a workpiece in an equal-angle intermittent manner to perform overall drying on the workpiece, a drying device is arranged in the scheme, the protection cover 27 is covered outside the workpiece, the heat generated by the heating wire 33 can be concentrated, the heat loss is reduced, the workpiece is fully dried, the drying efficiency is improved, the heating wire 33 can rotate in an equal-angle intermittent manner, the automation degree of equipment is improved, the heating wire 33 can perform overall annular drying on the outside of the workpiece through the equal-angle intermittent rotation, the drying efficiency is further improved, and the problem of uneven drying is avoided, in addition, the cam 25 is combined to drive the supporting plate 17 to reciprocate up and down, so that the upper end and the lower end of the workpiece can be dried, the drying position is more comprehensive, the drying effect is better, the surface of the workpiece can be dried only by using a single heating wire 33, and resources can be saved compared with the case of using a plurality of heating wires 33.

Example 9

On the basis of embodiment 6, the method further comprises:

an air pressure sensor provided in the connection pipe 20 for detecting an actual air pressure in the connection pipe 20;

the pressure detection device is arranged at a nozzle of the automatic spraying machine 3 and is used for detecting the spraying pressure of the automatic spraying machine 3;

the first controller is arranged on the outer wall of the base 14 and is electrically connected with the air pressure sensor, the pressure detection device and the vacuum generator 19 respectively;

the first controller controls the operation of the vacuum generator 19 based on the detection values of the pressure detection device and the air pressure sensor, and comprises the following steps:

step 1: based on the detected value of the pressure detecting means, the target air pressure in the connecting pipe 20 is calculated by the following formula:

wherein, P₁Is a target air pressure, P, in the connecting pipe 20₂The spraying pressure of the automatic spraying machine 3 detected by the pressure detection device, S₂The area of the side wall of the workpiece on the support plate 17 when the automatic coating machine 3 is coating is expressed as mu, the coefficient of friction of the upper surface of the support plate 17, m₁G is the weight of the workpiece on the supporting plate 17, g is the acceleration of gravity, and g is 9.8m/s²，S₁Is the radial cross-sectional area of the first through-hole 21;

step 2: based on the step 1, the first controller controls the vacuum generator 19 to operate, so that the actual air pressure in the connecting pipe 20 detected by the air pressure sensor is greater than the target air pressure in the connecting pipe 20.

The working principle and the beneficial effects of the technical scheme are as follows: when the automatic spraying machine 3 is used for spraying a workpiece, the vacuum generator 19 starts to work, so that suction is generated at one end of the connecting pipe 20, the workpiece is fixed on the supporting plate 17, quick fixation is realized, manual disassembly and assembly are not needed, when the automatic spraying machine 3 sprays the front side wall or the rear side wall of the workpiece, coating is sprayed to the workpiece from the nozzle of the automatic spraying machine 3, if the workpiece is not fixed firmly, the workpiece slides forwards and backwards easily in the spraying process, the spraying pressure of the automatic spraying machine 3 can be detected by arranging the pressure detection device, then the larger area of the front side wall or the rear side wall of the workpiece is selected according to the side wall area of the workpiece, the horizontal force applied to the front side wall and the rear side wall of the workpiece in the spraying process can be calculated, and then the workpiece can be weighed in advance by using the weighing device before the workpiece is placed according to the mass of the workpiece placed on the supporting plate 17, the target air pressure to be reached in the connecting pipe 20 can be accurately calculated through the formula, then the first controller can control the vacuum generator 19 to work, so as to adjust the air pressure in the connecting pipe 20, the air pressure sensor is used for detecting the actual air pressure in the connecting pipe 20, until the actual air pressure in the connecting pipe 20 detected by the air pressure sensor is greater than the target air pressure in the connecting pipe 20 calculated through the formula, the first controller controls the vacuum generator 19 to work, so that the actual air pressure in the connecting pipe 20 is always maintained to be greater than the target air pressure, at the moment, under the action of the suction force of the connecting pipe 20 and the gravity of the workpiece, the friction force borne by the workpiece is greater than the force of the automatic spraying machine 3 to the front and back horizontal directions of the side wall of the workpiece, therefore, the workpiece cannot shake or slide during spraying, the stability of the workpiece is greatly improved, and the spraying quality of the workpiece is guaranteed, the product quality is improved.

Example 10

On the basis of embodiment 1, as shown in fig. 3, the method further includes:

the dust collector 45 is arranged on the inner wall of the upper side of the spraying room body 1, the dust collector 45 is aligned with the upper surface of the conveyor belt 2 and is provided with a dust hood 46, and the lower end of the dust hood 46 is opposite to the spraying position of the automatic spraying machine 3;

the particle detection device is arranged on the inner wall of the spraying room body 1 and can detect the density of the gas generated by mixing the coating particles generated in the spraying process of the automatic spraying machine 3 and the air;

the first speed detection device is arranged on the automatic coating machine 3 and is used for detecting the rebound speed of the coating sprayed by the automatic coating machine 3 after the coating impacts the coating surface;

second speed detection means, provided at a nozzle of the automatic coating machine 3, for detecting an initial speed of the coating material sprayed from the automatic coating machine 3;

the pressure detection device is arranged at the cover opening of the dust hood 46 and is used for detecting the suction pressure at the cover opening of the dust hood 46;

the position setting and selection of the dust hood 46 comprises the following steps:

step 11: from the detection value of the particle detection device, the target distance from the hood opening of the dust hood 46 to the spray surface of the automatic spray coater 3 is calculated by the formula (1):

wherein L is₁Is a target distance, v, from the opening of the dust hood 46 to the spray surface of the automatic spray coater 3₁The rebound velocity t of the coating sprayed from the automatic coating machine 3 after the coating impacts the surface to be coated, which is detected by the first velocity detection device₁For the preset operating time, P, of the vacuum cleaner 45₁The suction pressure at the opening of the dust hood 46 detected by the pressure detection device is pi, which is the circumferential rate, and is 3.14, r₁Is the particle radius of the coating particles sprayed by the automatic coating machine 3, m is the mass of a single particle of the coating particles sprayed by the automatic coating machine 3, g is the gravity acceleration, and g is 9.8m/s²Rho is the gas density of the coating particles and air mixed in the spraying process of the automatic spraying machine 3 detected by the particle detection device, v is₂The automatic coating machine 3 sprays the coating material detected by the second speed detection deviceThe initial speed of the discharged coating, C is the fluid resistance coefficient of the coating particles in the flowing process;

step 12: based on the calculation result of the formula (1), the target circumference of the hood opening of the dust hood 46 is calculated by the formula (2):

wherein L is₂Is the target perimeter, Q, of the hood opening of the suction hood 46₁The rated air volume of the vacuum cleaner 45;

step 13: based on the calculation result of the formula (1), setting the actual distance from the cover opening of the dust collection cover 46 to the spraying surface of the automatic spraying machine 3 according to the target distance from the cover opening of the dust collection cover 46 to the spraying surface of the automatic spraying machine 3, so that the actual distance is less than or equal to the target distance, and selecting the dust collection cover 46 according to the calculation result of the formula (2), so that the actual circumference of the cover opening of the dust collection cover 46 is greater than or equal to the target circumference of the cover opening of the dust collection cover 46.

The working principle and the beneficial effects of the technical scheme are as follows: still be provided with dust catcher 45 in spray booth body 1, dust catcher 45 exit end sets up suction hood 46, the cover mouth of suction hood 46 lower extreme is just to the spraying position, when automatic spraying machine 3 began the spraying work, dust catcher 45 also began the work, thereby utilize suction hood 46 to inhale the coating granule that does not adhere to on work piece spraying surface in the spraying process in dust catcher 45, prevent the coating granule outflow, the pollution that produces in the spraying process has been reduced, when setting up suction hood 46, the cover mouth of suction hood 46 can be calculated through equation (1) to the target distance of work piece spraying surface when automatic spraying machine 3 sprays, in equation (1), P₁·π·r₁ ²Which represents the suction of the vacuum cleaner 45, mg is the weight force to which the individual paint particles are subjected,

the resistance of the coating particles to suction by the suction cleaner 45, where C is 0.45, the particle radius of the coating particles can be controlled by the counter-coatingThe detection of the material is obtained, the preset working time of the dust collector 45 is longer than the spraying time of the automatic spraying machine 3, the operator can set the actual distance from the cover opening of the dust hood 46 to the spraying surface of the automatic spraying machine 3 by himself, finally, according to the calculation result of the formula (1), the actual distance can be set so that the actual distance is not larger than the target distance, the target perimeter of the cover opening of the dust hood 46 can be calculated according to the formula (2), then, according to the calculation result of the formula (2), the dust hood 46 is selected so that the actual perimeter of the dust hood 46 is not smaller than the target perimeter, the actual distance from the cover opening of the dust hood 46 to the spraying surface of the automatic spraying machine 3 is set by the scheme, the paint particles adsorbed to the surface of the workpiece in the spraying process can be fully absorbed by the dust collector 45, the amount of the paint in the spraying room body 1 is reduced, the pollution is reduced, and, the actual circumference of the opening of the selected dust hood 46 is larger, so that paint particles can be prevented from escaping into the atmospheric environment outside the sprayer body, and the physical health of operators is effectively protected.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An automated painting booth, comprising: the spraying room comprises a spraying room body (1), wherein a conveying device is arranged in the spraying room body (1), the conveying device penetrates through the left end and the right end of the spraying room body (1), the conveying device comprises a conveying belt (2), the outer side wall of the conveying belt (2) is provided with a plurality of fixing components, an automatic spraying machine (3) and a drying device are arranged in the spraying room body (1), the automatic spraying machine (3) is arranged on the right side of the drying device, the automatic spraying machine (3) is located on the rear side of the conveying belt (2), and the drying device is located above the conveying belt (2);

a plurality of fixed subassembly equidistance distributes in conveyer belt (2) lateral wall, fixed subassembly includes:

the conveying belt structure comprises a base (14), wherein one side, facing the conveying belt (2), of the base (14) is fixedly connected with the surface of the conveying belt (2), a cavity (15) is arranged in the base (14), the cavity (15) penetrates through the upper surface of the base (14), four corners of the lower surface of the cavity (15) are respectively provided with a first spring (16), and one end of each first spring (16) is fixedly connected with the lower surface of the cavity (15);

the supporting plate (17) is arranged above the base (14), the lower surface of the supporting plate (17) is fixedly connected with the upper end of the first spring (16), and the upper surface of the supporting plate (17) is used for placing a workpiece to be machined;

the two limiting plates (18), the two limiting plates (18) are symmetrically arranged on the left side and the right side of the upper surface of the supporting plate (17);

the drying device includes:

the electric push rod (26), the electric push rod (26) is arranged on the inner wall of the upper side of the spraying room body (1);

the protective cover (27) is arranged at the lower end of the electric push rod (26), the upper surface of the protective cover (27) is fixedly connected with the lower end of the electric push rod (26), an opening is formed in the lower end of the protective cover (27), the opening is opposite to the supporting plate (17), and the diameter of the opening is larger than the length of the supporting plate (17);

the rotating ring (28) is arranged inside the protective cover (27), a plurality of first sliding blocks (29) are arranged on the outer side wall of the rotating ring (28), a sliding groove (30) matched with the first sliding blocks (29) is formed in the inner wall of the protective cover (27), the first sliding blocks (29) slide along the inner wall of the sliding groove (30), the rotating ring (28) can rotate in the protective cover (27) through the matching of the first sliding blocks (29) and the sliding groove (30), and annular ratchet teeth (31) are arranged on the inner wall of the rotating ring (28);

the mounting plate (32), the mounting plate (32) is arranged on the lower surface of the rotating ring (28), the mounting plate (32) is perpendicular to the lower surface of the rotating ring (28), and the mounting plate (32) is provided with a heating wire (33) towards one side wall of the central axis of the protective cover (27);

the sliding rail (34) is arranged on the inner wall of the upper end of the protective cover (27), a second sliding block (35) is arranged on the lower side of the sliding rail (34) in a sliding mode, a first connecting rod (36) is arranged at one end, close to the rotating ring (28), of the second sliding block (35), a rectangular frame (37) is arranged on the lower surface of the first connecting rod (36), a clamping block (38) is arranged in the rectangular frame (37), the outer wall of the clamping block (38) is connected with the inner wall of the rectangular frame (37) in a sliding mode, the lower end of the clamping block (38) extends to the lower portion of the rotating ring (28), and the clamping block (38) faces one side of the ratchet teeth (31) and is matched with the tooth shapes of the ratchet teeth (31);

the second spring (39) is arranged in the rectangular frame (37), one end of the second spring (39) is fixedly connected with the inner wall of the rear side of the rectangular frame (37), and the other end of the second spring (39) is fixedly connected with one side, away from the ratchet teeth (31), of the clamping block (38);

the second motor (40) is arranged on the left side of the sliding rail (34), the upper end of the second motor (40) is fixedly connected with the inner wall of the upper side of the protective cover (27), the lower end of the second motor (40) is provided with an output shaft, a rotating disc (41) is arranged on the output shaft, a second rotating shaft (42) is arranged on the lower surface of the rotating disc (41), and one end of the second rotating shaft (42) is rotatably connected with the eccentric position of the lower surface of the rotating disc (41);

second connecting rod (43), second connecting rod (43) set up carousel (41) below, second connecting rod (43) one end with second pivot (42) are kept away from carousel (41) one end is rotated and is connected, second connecting rod (43) other end sets up third pivot (44), third pivot (44) one end with second connecting rod (43) upper surface rotates and connects, third pivot (44) other end with first connecting rod (36) lower surface rotates and connects.

2. The automatic spraying room of claim 1, wherein a first observation window (4) and a second observation window (5) are sequentially arranged on the front side wall of the spraying room body (1) from left to right, transparent explosion-proof glass is arranged at each of the first observation window (4) and the second observation window (5), the first observation window (4) is arranged below the drying device, and the second observation window (5) is positioned right in front of the automatic spraying machine (3).

3. The automatic spraying room of claim 1, wherein a right side wall of the spraying room body (1) is provided with a feeding hole (6), the feeding hole (6) is provided with a first baffle (7), the upper end of the first baffle (7) is hinged to the inner wall of the upper end of the feeding hole (6), the left side wall of the spraying room body (1) is provided with a discharging hole (8), the discharging hole (8) is provided with a second baffle (9), and the upper end of the second baffle (9) is hinged to the inner wall of the upper end of the discharging hole (8).

4. The automatic spraying room of claim 1, wherein the right outer wall of the spraying room body (1) is provided with a blower (10), the blower (10) is communicated with the inside of the spraying room body (1) through an air inlet pipe (11), the left outer wall of the spraying room body (1) is provided with an exhaust fan (12), and the exhaust fan (12) is communicated with the inside of the spraying room body (1) through an exhaust pipe (13).

5. The automatic spraying room of claim 1, wherein a vacuum generator (19) is arranged in the cavity (15), a connecting pipe (20) is arranged at one end of the vacuum generator (19), a first through hole (21) matched with the connecting pipe (20) is arranged in the support plate (17), the upper end and the lower end of the first through hole (21) respectively penetrate through the upper side surface and the lower side surface of the support plate (17), and one end, far away from the vacuum generator (19), of the connecting pipe (20) is arranged in the first through hole (21).

6. The automated painting booth of claim 1, further comprising:

the first rotating shaft (22), the first rotating shaft (22) is arranged in the cavity (15), and the left end and the right end of the first rotating shaft (22) are respectively in rotating connection with the inner walls of the left side and the right side of the cavity (15);

the transverse plate (23) is arranged on the outer wall of the base (14), a first motor (24) is arranged on the upper surface of the transverse plate (23), and the output end of the first motor (24) penetrates through the side wall of the base (14) and is fixedly connected with one end of the first rotating shaft (22);

a cam (25), the cam (25) being disposed on the first shaft (22).

7. The automated painting booth of claim 5, further comprising:

the air pressure sensor is arranged in the connecting pipe (20) and is used for detecting the actual air pressure in the connecting pipe (20);

the pressure detection device is arranged at a nozzle of the automatic spraying machine (3) and is used for detecting the spraying pressure of the automatic spraying machine (3);

the first controller is arranged on the outer wall of the base (14), and is respectively and electrically connected with the air pressure sensor, the pressure detection device and the vacuum generator (19);

the first controller controls the vacuum generator (19) to work based on the detection values of the pressure detection device and the air pressure sensor, and comprises the following steps:

step 1: based on the detection value of the pressure detection means, a target air pressure within the connection pipe (20) is calculated by the following formula:

wherein, P₁Is a target air pressure, P, in the connecting tube (20)₂The spraying pressure of the automatic spraying machine (3) detected by the pressure detection device is S₂When the automatic spraying machine (3) sprays, the area of the side wall of the workpiece on the supporting plate (17) is mu which is the friction coefficient of the upper surface of the supporting plate (17), and m is₁Is the weight of the workpiece on the supporting plate (17), g is the acceleration of gravity, and g is 9.8m/s²，S₁Is the radial cross-sectional area of the first through-hole (21);

step 2: based on the step 1, the first controller controls the vacuum generator (19) to work, so that the actual air pressure in the connecting pipe (20) detected by the air pressure sensor is larger than the target air pressure in the connecting pipe (20).

8. The automated painting booth of claim 1, further comprising:

the dust collector (45) is arranged on the inner wall of the upper side of the spraying room body (1), the dust collector (45) is aligned to the upper surface of the conveyor belt (2) and is provided with a dust collection cover (46), and the lower end of the dust collection cover (46) is opposite to the spraying position of the automatic spraying machine (3);

the particle detection device is arranged on the inner wall of the spraying room body (1), and can detect the density of gas generated by mixing the coating particles and air generated in the spraying process of the automatic spraying machine (3);

the first speed detection device is arranged on the automatic coating machine (3) and is used for detecting the rebound speed of the coating sprayed by the automatic coating machine (3) after the coating impacts the coated surface;

the second speed detection device is arranged at a nozzle of the automatic coating machine (3) and is used for detecting the initial speed of the coating sprayed by the automatic coating machine (3);

the pressure detection device is arranged at the opening of the dust hood (46) and is used for detecting the suction pressure at the opening of the dust hood (46);

the position setting and selecting of the dust hood (46) comprises the following steps:

step 11: calculating a target distance from a cover opening of the dust suction cover (46) to a spraying surface of the automatic sprayer (3) according to a detection value of the particle detection device by a formula (1):

wherein L is₁Is the target distance, v, from the hood opening of the suction hood (46) to the spraying surface of the automatic spraying machine (3)₁The automatic coating machine (3) sprays the coating material detected by the first speed detection deviceRebound velocity, t, of the discharged coating after impact on the sprayed surface₁For the preset working time, P, of the dust collector (45)₁The suction pressure at the cover opening of the dust suction cover (46) detected by the pressure detection device is pi, which is the circumferential rate and is 3.14, r₁Is the particle radius of the coating particles sprayed by the automatic coating machine (3), m is the single particle mass of the coating particles sprayed by the automatic coating machine (3), g is the gravity acceleration, and g is 9.8m/s²Rho is the gas density of the mixed coating particles and air generated in the spraying process of the automatic spraying machine (3) and detected by the particle detection device, v is₂The initial speed of the coating sprayed by the automatic coating machine (3) is detected by the second speed detection device, and C is a fluid resistance coefficient of the coating particles in the flowing process;

step 12: calculating a target circumference of a hood opening of the dust hood (46) by formula (2) based on a calculation result of formula (1):

wherein L is₂Is a target perimeter, Q, of a hood opening of the suction hood (46)₁The rated air quantity of the dust collector (45);

step 13: based on the calculation result of the formula (1), setting the actual distance from the cover opening of the dust collection cover (46) to the spraying surface of the automatic spraying machine (3) according to the target distance from the cover opening of the dust collection cover (46) to the spraying surface of the automatic spraying machine (3), enabling the actual distance to be smaller than or equal to the target distance, and selecting the dust collection cover (46) according to the calculation result of the formula (2), so that the actual circumference of the cover opening of the dust collection cover (46) is larger than or equal to the target circumference of the cover opening of the dust collection cover (46).