CN112206954B

CN112206954B - Electrostatic powder coating process

Info

Publication number: CN112206954B
Application number: CN202011050955.XA
Authority: CN
Inventors: 张华锋; 蔺富; 胡文元
Original assignee: Shanghai Fufu Machinery Technology Co ltd
Current assignee: Shanghai Fufu Machinery Technology Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-10-12
Anticipated expiration: 2040-09-29
Also published as: CN112206954A

Abstract

The application discloses an electrostatic powder coating process, which relates to the technical field of electrostatic spraying, and adopts the technical scheme that a powder recovery device of a powder recovery device comprises a frame, a conveyor belt arranged on the frame, a dust removal device arranged on the frame, a communication device arranged at the bottom end of the dust removal device and a recovery device communicated with the communication device; the dust removal device comprises a shell arranged above the conveyor belt and an air blowing pipe arranged inside the shell; the communicating device comprises a collecting hopper arranged at the bottom end of the dust removing device, a communicating pipe communicated with the bottom end of the collecting hopper and a pneumatic pump communicated with the communicating pipe; the recovery device comprises a barrel body, an air outlet pipe communicated with the barrel body, a filter screen for filtering the air outlet of the air outlet pipe and a filter screen arranged in the barrel body; the conveyer belt is provided with a plurality of through holes. This application can retrieve the recycle to the part powder that produces in the production process, has reduction in production cost effect.

Description

Electrostatic powder coating process

Technical Field

The application relates to the technical field of electrostatic spraying, in particular to an electrostatic powder coating process.

Background

Electrostatic powder coating is a coating material sprayed by an electrostatic powder spray gun, powder particles are charged with negative charges while being dispersed, the charged powder particles are coated on a grounded object under the action of airflow (or other acting force such as centrifugal force) and electrostatic attraction, and the grounded object is heated, melted and solidified into a film. Has the advantages of reducing environmental pollution, saving energy, having excellent coating performance and the like.

Different work pieces are different to the requirement of application, and partial work piece only need local spraying, at this moment, need shelter from the position that does not need the spraying at the in-process of spraying, and the baffle that through sheltering from replaces the position that need not be sprayed, will lead to a large amount of powder adhesion on the baffle like this, because the baffle can reuse, directly washs the powder on the baffle, then can cause the waste of powder on the baffle, is unfavorable for manufacturing cost's reduction.

Disclosure of Invention

The electrostatic powder coating process has the advantages that the defects in the prior art are overcome, the part of powder generated in the production process can be recycled, and the production cost is reduced.

In order to achieve the purpose, the application provides the following technical scheme: an electrostatic powder coating process, characterized by comprising the steps of:

the method comprises the following steps: cleaning, namely spraying and cleaning the surface of the plate to be sprayed to remove oil stains and impurities on the surface of the plate;

step two: and (5) drying. Placing the cleaned plate in a drying chamber for drying, and removing residual water marks on the surface of the plate;

step four: spraying powder, namely spraying the front side, quickly drying after spraying, spraying the back side after quickly drying the front side, and quickly drying after spraying;

step five: disassembling the baffle, taking down the baffle covered previously after powder spraying is finished, placing the baffle on powder recovery equipment, and waiting for recovering the powder on the baffle;

step six: drying and curing, namely placing the spray-coated plate subjected to electrostatic spraying and quick drying into a drying and curing box, and curing the powder to obtain a finished plate;

step seven: recovering the powder, namely recovering the powder on the baffle plate by using powder recovery equipment;

the powder recovery device comprises a frame, a conveyor belt arranged on the frame, a dust removal device arranged on the frame, a communication device arranged at the bottom end of the dust removal device and a recovery device communicated with the communication device; the dust removal device comprises a shell arranged above the conveyor belt and an air blowing pipe arranged inside the shell; the communicating device comprises a collecting hopper arranged at the bottom end of the dust removing device, a communicating pipe communicated with the bottom end of the collecting hopper and a pneumatic pump communicated with the communicating pipe; the recovery device comprises a barrel body, an air outlet pipe communicated with the barrel body, a filter screen for filtering the air outlet of the air outlet pipe and a filter screen arranged in the barrel body; the conveyer belt is provided with a plurality of through holes.

Through adopting above-mentioned technical scheme, the back is accomplished in dusting, take off the baffle on the panel, place the conveyer belt with the baffle on, enter into dust collector under the transportation of conveyer belt in, blow away the dust that is located the baffle surface through the outlet duct in the dust collector, and inhale in the collecting hopper through the intercommunication device, in entering into recovery unit through communicating pipe, through filtering in recovery unit, filter out the less dust of volume, pass through the screening of filter sieve again, get rid of the great impurity of granule, the completion is to the screening and the recovery of dust, realize recycling to the dust.

The application is further configured to: the two sides of the shell are rotatably connected with side pipes, and the side pipes are communicated with a plurality of branch pipes.

By adopting the technical scheme, the side pipe blows air to the gap between the shell and the conveyor belt, and powder escaping from the gap between the shell and the conveyor belt when the air outlet pipe blows air is reduced.

The application is further configured to: the filter screen is annular, and the side wall of the filter screen filters the air outlet pipe; the barrel body is communicated with a powder blowing pipe, and one end of the powder blowing pipe extending into the barrel body is positioned between the filter screen and the inner wall of the barrel body; the inside of staving is provided with the drive assembly who drives the filter screen pivoted.

Through adopting above-mentioned technical scheme, when filtering, the powder can the adhesion on the filter screen, and a large amount of accumulations can influence the passing through of dust, blows off the filter screen dust through blowing the powder pipe, reduces the powder of adhesion on the filter screen.

The application is further configured to: the drive assembly comprises a connecting column connected to the top end of the barrel body in a rotating mode, a rotating plate fixed to the connecting column and far away from one end of the barrel body, and a plurality of pulp plates fixed to the rotating plate, wherein the rotating plate is circular, and the filter screen has the advantage of being fixedly connected with the side wall of the rotating plate.

By adopting the technical scheme, the pulp board can be blown in the process of air inlet of the communicating pipe, the pulp board is subjected to repentance to drive the rotating board to rotate, so that the filter screen is driven to rotate, extra power is not required to be provided to drive the filter screen to rotate, and the filter screen is driven to rotate in the process of collecting dust conveniently.

The application is further configured to: one end of the air outlet pipe extending into the barrel body is provided with a sealing assembly, the sealing assembly comprises a sealing shell which is fixed on the inner wall of the barrel body and is communicated with the air outlet pipe and limiting blocks which are fixed at the top end and the bottom end of the sealing shell, and one side of the sealing shell, which is close to the filter screen, is in an arc shape and is abutted against the filter screen; and a gap for the filter screen to pass through is reserved between the limiting block sealing shells.

Through adopting above-mentioned technical scheme, seal assembly can increase the leakproofness between filter screen and the outlet duct, reduces the powder that leaves from filter screen and outlet duct intercommunication position department.

The application is further configured to: the filter screen comprises a screen mesh and a bracket for fixing the screen mesh, and the side wall of the bracket is abutted against the inner wall of the barrel body; the bottom end of the barrel body is provided with a power assembly which drives the filter screen to do reciprocating motion.

By adopting the technical scheme, the powder falls onto the screen, and impurities with the particle size larger than the aperture of the screen cannot pass through the screen and remain on the screen; the power component drives the screen to vibrate, so that the powder on the screen can be conveniently vibrated.

The application is further configured to: the dust removal device further comprises a lifting plate and a driving piece, wherein the lifting plate is connected inside the shell in a sliding mode, the driving piece drives the lifting plate to lift, and the air blowing pipe is fixed on the lifting plate.

Through adopting above-mentioned technical scheme, the driving piece drives the lifter plate and goes up and down to drive the distance between gas blow pipe and the baffle, conveniently adjust the clearance effect of baffle.

The application is further configured to: a connecting plate is arranged at the bottom end of the conveyor belt and is positioned between the feeding end of the conveyor belt and the dust removal device; the top of the frame is fixed with a shell.

By adopting the technical scheme, the fishplate bar can receive powder falling in the transportation process, so that the waste of the powder is reduced; the shell can block dust in the air, and dust falling onto the shell is reduced.

To sum up, the beneficial technical effect of this application does:

1. after powder spraying is finished, the baffle on the plate is taken down, the baffle is placed on a conveyor belt, the baffle enters a dust removal device under the transportation of the conveyor belt, dust on the surface of the baffle is blown away through an air outlet pipe in the dust removal device and is sucked into a collecting hopper through a communicating device, the dust enters a recovery device through a communicating pipe, the recovery device is filtered to filter out dust with small volume, and the dust is screened through a filter screen to remove impurities with large particles, so that the dust is screened and recovered, and the dust is recycled;

2. the pulp board can be blown in the process of air intake of the communicating pipe, the pulp board is subjected to force repentance to drive the rotating board to rotate, so that the filter screen is driven to rotate, extra power is not required to be provided to drive the filter screen to rotate, and the filter screen is conveniently driven to rotate in the process of collecting dust;

3. the powder falls onto the screen, and impurities with the particle size larger than the aperture of the screen cannot pass through the screen and remain on the screen; the power component drives the screen to vibrate, so that the powder on the screen can be conveniently vibrated.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

FIG. 2 is a schematic view showing the structure of the dust removing apparatus;

FIG. 3 is a schematic view showing the overall structure of the communicating means;

FIG. 4 is a schematic view showing the structure of the recycling apparatus;

FIG. 5 is a schematic view showing the inside of the recycling apparatus;

FIG. 6 is a schematic structural diagram of a drive assembly;

FIG. 7 is a schematic diagram of a mechanism embodying a filter assembly;

fig. 8 is a schematic structural diagram embodying the power module.

In the figure: 1. a frame; 11. a housing; 12. a limiting plate; 2. a conveyor belt; 21. a through hole; 22. connecting a plate; 3. a dust removal device; 31. a housing; 311. a connecting plate; 32. a lifting plate; 33. a hydraulic cylinder; 34. an air blowing pipe; 341. air holes; 35. a side tube; 351. a connecting plate; 352. a branch pipe; 4. a communication device; 41. a collection hopper; 42. a communicating pipe; 43. a pneumatic pump; 5. a recovery device; 51. a barrel body; 511. a support frame; 512. a discharge port; 52. an air outlet pipe; 521. a seal assembly; 5211. sealing the shell; 5212. a limiting block; 53. filtering with a screen; 531. a powder blowing pipe; 54. a drive assembly; 541. connecting columns; 542. a rotating plate; 543. a pulp sheet; 55. screening; 551. screening a screen; 552. a support; 56. a power assembly; 561. a motor; 562. a turntable; 563. a connecting rod; 564. a connecting ring; 5461. connecting blocks; 565. and (5) fixing the column.

Detailed Description

The present application is described in further detail below with reference to the attached figures.

Example (b): an electrostatic powder coating process comprising the steps of:

the method comprises the following steps: and (5) cleaning. And (3) carrying out spray cleaning on the surface of the plate to be sprayed, and cleaning oil stains and impurities on the surface of the plate.

Step two: and (5) drying. And (4) placing the cleaned plate into a drying chamber for drying, and removing residual water marks on the surface of the plate.

Step three: hanging the plate. And hanging the dried plate in a spraying workshop, covering a baffle at a position where spraying is not needed, and waiting for a subsequent powder spraying process. Before spraying, the surface of the plate needs to be checked whether obvious impurities remain on the surface of the plate, and a baffle cover is arranged at a position where spraying is not needed.

Step four: and (5) spraying powder. And (3) firstly, carrying out front spraying, then carrying out quick drying, carrying out back spraying after the front quick drying, and carrying out quick drying after the spraying.

Step five: and (5) disassembling the baffle. And after powder spraying is finished, taking down the baffle covered previously, placing the baffle on powder recovery equipment, and waiting for recovering the powder on the baffle.

Step six: and (5) drying and curing. And (4) placing the spray-coated plate subjected to electrostatic spraying and quick drying into a drying and curing box, and curing the powder to obtain a finished plate.

Step seven: and (4) recovering the powder. And recovering the powder on the baffle plate by using a powder recovery device.

Referring to fig. 1, the powder recovery apparatus includes a frame 1, a conveyor belt 2 disposed on the frame 1, a dust removing device 3 disposed on the frame 1, a communicating device 4 disposed at a bottom end of the dust removing device 3, and a recovery device 5 communicating with the communicating device 4.

The conveyor belt 2 is provided with a plurality of through holes 21 for the powder to pass through. The bottom end of the conveyor belt 2 is provided with a connecting plate 22, the connecting plate 22 is fixedly connected with the frame 1, and the connecting plate 22 is positioned between the feeding end of the conveyor belt 2 and the dust removal device 3. A shell 11 is fixed at the top end of the frame 1, a gap for the baffle to pass through is reserved between the shell 11 and the conveyor belt, and the shell 11 is also positioned between the feeding end of the conveyor belt 2 and the dust removal device 3. The discharge end of conveyer belt 2 is provided with limiting plate 12, and the clearance between limiting plate 12 and the conveyer belt 2 is less than the thickness of baffle, prevents that the baffle from dropping from the discharge end of conveyer belt.

Referring to fig. 1 and 2, the dust removing device 3 includes a housing 31 disposed above the conveyor belt 2, a lifting plate 32 slidably connected inside the housing 31, a hydraulic cylinder 33 driving the lifting plate 32 to lift, an air blowing pipe 34 fixed on one side of the lifting plate 32 close to the conveyor belt 2, and side pipes 35 rotatably connected to both sides of the housing 31.

Connecting plates 311 are fixed on two sides of the shell 31, and the connecting plates 311 are fixedly connected with the frame 1 to fix the shell 31. A gap for the baffle to pass through is left between the shell 31 and the conveyor belt 2. The cylinder body of the hydraulic cylinder 33 is fixed at the top end of the shell 31, the piston rod of the hydraulic cylinder 33 is fixedly connected with the lifting plate 32, and the lifting plate 32 is driven to lift by extending and retracting the piston rod of the hydraulic cylinder 33. One end of the air blowing pipe 34 is closed, the other end of the air blowing pipe passes through the shell 31 and is communicated with the air pump through a hose, a plurality of air holes 341 are formed in the air blowing pipe 34, and dust on the surface of the baffle is blown off from the baffle through the air holes 341. The two ends of the side tube 35 are provided with connecting plates 351, the connecting plates 351 are fixedly connected with the shell 31, and the side tube 35 is rotatably connected with the connecting plates 351. One end of the side pipe 35 is closed, the other end of the side pipe 35 is communicated with the air pump, a plurality of branch pipes 352 are communicated with the side pipe 35, air is blown to the gap between the shell 31 and the conveyor belt 2 through the branch pipes 352, and dust escaping from the gap between the shell 31 and the conveyor belt 2 is reduced.

Referring to fig. 3, the communicating means 4 includes a collecting hopper 41 provided at the bottom end of the dust removing device 3, a communicating pipe 42 communicating with the bottom end of the collecting hopper 41, and a pneumatic pump 43 communicating with the communicating pipe 42. An end of the communication pipe 42 remote from the collection hopper 41 communicates with the recovery device 5. The pneumatic pump 43 can provide negative pressure for the collecting hopper 41 to recover dust blown off by the dust removing device 3; at the same time, the pneumatic pump 43 supplies power to blow the powder introduced into the collecting hopper 41 into the recovery device 5.

Referring to fig. 4 and 5, the recycling device 5 includes a barrel 51, an outlet pipe 52 communicated with the barrel 51, a filter screen 53 for filtering the outlet air of the outlet pipe 52, a driving assembly 54 for driving the filter screen 53 to rotate, a filter screen 55 disposed inside the barrel 51, and a power assembly 56 for driving the filter screen 55 to move.

A support frame 511 for supporting the barrel body 51 is fixed at the bottom end of the barrel body 51, a discharge port 512 is further arranged at the bottom end of the barrel body 51, and a control valve for controlling the opening and closing of the discharge port 512 is arranged on the discharge port 512. The barrel body 51 is also communicated with a powder blowing pipe 531, one end of the powder blowing pipe 531 extending into the barrel body 51 is positioned between the filter screen 53 and the inner wall of the barrel body 51, and the other end of the powder blowing pipe 531 is communicated with an air pump. The aperture of the filtering holes on the filtering screen 53 is smaller than the aperture of the powder sprayed in the fourth step, and the aperture of the screen opening on the filtering screen 55 is larger than the aperture of the powder sprayed in the fourth step.

Referring to fig. 6, the driving assembly 54 includes a connection post 541 rotatably connected to the top end of the barrel 51, a rotation plate 542 fixed to an end of the connection post 541 away from the barrel 51, and a plurality of paddles 543 fixed to the rotation plate 542. The rotating plate 542 is circular; the screen 53 is ring-shaped, and is disposed around the rotating plate 542 and fixedly coupled to the rotating plate 542.

When the dust collector is used, the filter screen 53 plays a role in filtering, dust with the particle size smaller than the aperture of the filter screen 53 is discharged from the air outlet pipe 52, and powder with the particle size larger than the aperture of the filter screen 53 remains in the barrel body 51. In the process, part of the powder remains on the inner wall of the filter screen 53, which can affect the passing of the dust; the filter 53 is blown by the powder blowing duct 531 provided on the outer wall of the filter 53 to blow off the powder adhered to the inner wall of the filter 53. The connection pipe 42 connected to the tub 51 blows the paddle plate 543 to provide power for the rotation of the rotating plate 542.

Referring to fig. 6 and 7, a sealing assembly 521 is disposed at one end of the outlet pipe 52 extending into the barrel body 51. The sealing assembly 521 includes a sealing case 5211 fixed to the inner wall of the tub 51 and communicating with the outlet duct 52, and stoppers 5212 fixed to the top and bottom ends of the sealing case 5211. One side of the sealing shell 5211 close to the filter screen 53 is in an arc shape abutted against the filter screen 53; the cross section of the limit block 5212 is L-shaped, and a gap for the filter screen 53 to pass through is reserved between the limit block 5212 and the sealing shell 5211. The filter 53 is held between the stopper 5212 and the sealing case 5211, and dust escaping from between the filter 53 and the sealing case 5211 can be reduced.

Referring to fig. 6 and 8, the screen 55 includes a screen 551 and a bracket 552 to fix the screen 551, and a side wall of the bracket 552 abuts against an inner wall of the tub 51.

The power assembly 56 includes a motor 561, a rotary plate 562 driven by the motor 561 for rotation, a connecting rod 563 hinged to an edge of the rotary plate 562, a connecting ring 564 disposed at an end of the connecting rod 563 remote from the rotary plate 562, and a plurality of fixing posts 565 vertically fixed to a side of the connecting ring 564 adjacent to the screen 55. The fixing post 565 vertically passes through the bottom end of the barrel body 51, and an end away from the connection ring 564 is fixedly connected to the bracket 552.

A connecting block 5461 is fixed at one end of the connecting ring 564 close to the connecting rod 563, and one end of the connecting rod 563 close to the connecting block 5461 is hinged with the connecting block 5461. The rotary table 562 is driven by the motor 561 to rotate, and the rotary table 562 drives the connecting rod 563 to move after rotating, so as to drive the connecting ring 564 to move; the connection ring 564 is limited by the fixing post 565 and can only reciprocate vertically, so as to drive the filter screen 55 to reciprocate. The reciprocating motion of screen 55 can drive the powder that is located screen 55 surface and produce the vibration, reduces the piling up of powder on screen 55, is convenient for the powder to pass through screen 55.

During the use, place the baffle that has the powder on conveyer belt 2, remove dust collector 3's below through the transportation of conveyer belt 2, blow in the dust on the baffle through dust collector 3 to be located the intercommunication device 4 of 3 bottom ends of dust collector, enter into recovery unit 5 through intercommunication device 4 in, retrieve the powder and recycle.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An electrostatic powder coating process, characterized by comprising the steps of:

step two: drying;

placing the cleaned plate in a drying chamber for drying, and removing residual water marks on the surface of the plate;

the powder recovery device comprises a rack (1), a conveyor belt (2) arranged on the rack (1), a dust removal device (3) arranged on the rack (1), a communication device (4) arranged at the bottom end of the dust removal device (3) and a recovery device (5) communicated with the communication device (4); the dust removal device (3) comprises a shell (31) arranged above the conveyor belt (2) and an air blowing pipe (34) arranged inside the shell (31); the communicating device (4) comprises a collecting hopper (41) arranged at the bottom end of the dust removing device (3), a communicating pipe (42) communicated with the bottom end of the collecting hopper (41) and a pneumatic pump (43) communicated with the communicating pipe (42); the recovery device (5) comprises a barrel body (51), an air outlet pipe (52) communicated with the barrel body (51), a filter screen (53) for filtering the air outlet of the air outlet pipe (52) and a filter screen (55) arranged in the barrel body (51); the conveyor belt (2) is provided with a plurality of through holes (21);

the filter screen (53) is annular, and the side wall of the filter screen (53) filters the air outlet pipe (52); the barrel body (51) is communicated with a powder blowing pipe (531), and one end of the powder blowing pipe (531) extending into the barrel body (51) is positioned between the filter screen (53) and the inner wall of the barrel body (51); the barrel body (51) is internally provided with a driving component (54) which drives the filter screen (53) to rotate.

2. The electrostatic powder coating process according to claim 1, characterized in that: two sides of the shell (31) are rotatably connected with side pipes (35), and the side pipes (35) are communicated with a plurality of branch pipes (352).

3. The electrostatic powder coating process according to claim 1, characterized in that: drive assembly (54) are including rotating spliced pole (541) of connecting on staving (51) top, fix and keep away from rotating plate (542) of staving (51) one end and fix a plurality of thick liquid boards (543) on rotating plate (542) at spliced pole (541), rotating plate (542) are circular, and the base of filter screen (53) is better advantage of and rotates the lateral wall fixed connection of board (542).

4. The electrostatic powder coating process according to claim 1, characterized in that: one end of the air outlet pipe (52) extending into the barrel body (51) is provided with a sealing assembly (521), the sealing assembly (521) comprises a sealing shell (5211) which is fixed on the inner wall of the barrel body (51) and communicated with the air outlet pipe (52) and limiting blocks (5212) which are fixed at the top end and the bottom end of the sealing shell (5211), and one side, close to the filter screen (53), of the sealing shell (5211) is in a circular arc shape which is abutted to the filter screen (53); gaps for the filter screen (53) to pass through are reserved between the limiting blocks (5212) and the sealing shells (5211).

5. The electrostatic powder coating process according to claim 1, characterized in that: the filter screen (55) comprises a screen (551) and a bracket (552) for fixing the screen (551), wherein the side wall of the bracket (552) is abutted against the inner wall of the barrel body (51); the bottom end of the barrel body (51) is provided with a power component (56) which drives the filter screen (55) to do reciprocating motion.

6. The electrostatic powder coating process according to claim 1, characterized in that: the dust removal device (3) further comprises a lifting plate (32) connected inside the shell (31) in a sliding mode and a driving piece driving the lifting plate (32) to lift, and the air blowing pipe (34) is fixed on the lifting plate (32).

7. The electrostatic powder coating process according to claim 1, characterized in that: a connecting plate (22) is arranged at the bottom end of the conveyor belt (2), and the connecting plate (22) is positioned between the feeding end of the conveyor belt (2) and the dust removal device (3); the top end of the frame (1) is fixed with a shell (11).