CN211463561U - Plate and strip powder spraying device - Google Patents

Abstract

The utility model provides a slab band powder spraying device, including an at least spraying mechanism, spraying mechanism includes powder spray gun group and two at least jet-propelled spray guns, and powder spray gun group includes a plurality of spray guns that set up along the width direction interval arrangement of slab band, and each jet-propelled spray gun homoenergetic is along the width direction reciprocating motion of slab band, and each jet-propelled spray gun can remove to powder spray gun group along the width direction's of slab band both ends department or remove to between the two adjacent spray guns of powder spray gun group. The utility model provides a slab band powder spraying device can effectively improve the powder on the slab band width direction portion on the surface the powder volume of going up, reduces the loss and the waste of powder, guarantees that the powder in the surface department of slab band can evenly be attached to the slab band on the surface, guarantees the homogeneity that the slab band was surperficial to powder to guarantee after toasting that the slab band surface each department film thickness is unanimous, improves the product percent of pass of static powder spraying slab band.

Description

Plate and strip powder spraying device

Technical Field

The utility model belongs to the technical field of powder electrostatic spraying technique and specifically relates to indicate a slab band powder spraying device of continuous electrostatic powder spraying technique who relates to intermittent steel sheet in plane, aluminum plate or coil of strip, aluminium book.

Background

At present, in the production standard of carrying out powder continuous electrostatic spraying on intermittent steel plates, aluminum plates or steel coils and aluminum coils, after the electrostatic powder spraying is adopted and heated and baked, the thickness of a paint film on the electrostatic powder spraying is required to be uniform and consistent along the width range of the plates and the strips, and the error is very small. In the existing plate and belt continuous electrostatic powder spraying mode, electrostatic powder spray guns are adopted, and a plurality of spray guns are arranged in a row and are arranged in multiple rows for spraying; the spray guns carry powder by adopting compressed air, the powder with static electricity sprayed out of the spray guns is sprayed out by charging of the electrostatic discharge device at the head of the spray guns, and the powder with static electricity sprayed out of the spray guns is adsorbed on the surface of the metal plate strip by the attraction between the charge and the metal under the action of the static electricity.

Take one row of spray guns as an example: because a plurality of spray guns arranged in a row simultaneously spray a large amount of compressed air and powder, the compressed air quickly expands after being sprayed out of the spray guns; the spray guns in the row are close to each other, the compressed air sprayed by the spray guns in the middle row can transversely extrude and blow the compressed air and the sprayed powder sprayed by the spray guns at the edge part, so that the transverse drift velocity of the powder sprayed by the spray guns at the edge part is far greater than that of the powder sprayed by the spray guns at the middle part, therefore, the powder sprayed by the spray guns on the edge part is relatively poor in the capability of being adsorbed on the surface of the plate strip by utilizing the electrostatic charge effect, is extruded and blown to the outer parts of two sides of the plate strip in the width direction without falling on the plate strip, reduces the powder adhering amount of the powder sprayed by the spray guns on the surface of the plate strip, and causes serious powder waste, and causes uneven powdering of the surface of the strip along the width direction thereof, and a thinner thickness of the powder at the edge of the strip, the thickness of a paint film on the surface of the plate strip along the width direction is inconsistent after baking, so that the qualification rate of the plate strip is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a slab band powder spraying device carries out the in-process of spraying at the slab band that has various widths, can effectively improve the powder volume of portion on the slab band surface width direction, reduces the waste of spraying in-process powder, guarantees that the slab band surface is evenly being powdered to guarantee to toast the paint film thickness on back slab band surface unanimously, improve the product percent of pass of electrostatic powder spraying slab band.

In order to achieve the above object, the utility model provides a slab band powder spraying device, wherein, slab band powder spraying device includes an at least spraying mechanism, spraying mechanism includes powder spray gun group and two at least jet-propelled spray guns, powder spray gun group includes a plurality of spray guns that set up along the width direction interval arrangement of slab band, each the jet-propelled spray gun homoenergetic is followed the width direction reciprocating motion of slab band, and each jet-propelled spray gun can move extremely the edge of powder spray gun group the width direction's of slab band both ends department or move extremely two of powder spray gun group are adjacent between the spray guns.

The powder spraying device for the plate strip, wherein the air injection spray gun comprises a first section and a second section which are arranged in an extending manner in a direction perpendicular to the plate strip, the first section and the second section are communicated and connected through a transition section, the air injection spray gun can rotate by taking the axis of the first section as a center, and the second section can move to be located in the same plane perpendicular to the plate strip as each powder injection spray gun.

The plate strip powder spraying device comprises a first section and a second section, wherein the first section extends in a direction perpendicular to the plate strip, the second section is rotatably hinged and communicated with the lower end of the first section, the second section can swing in a cone with a cone angle of 0-30 degrees by taking the axis of the first section as a center, and the lower end of the second section can swing to be located in the same plane perpendicular to the plate strip with each powder spraying gun.

The strip powder spraying device comprises four air injection spray guns, wherein every two air injection spray guns are arranged in pairs at intervals along the length direction of the strip, the two air injection spray guns arranged in pairs can synchronously move along the width direction of the strip, and the distance between every two air injection spray guns in pairs is 30-200 mm.

The sheet strip powder spraying apparatus described above, wherein, in a state where the plate strip is sprayed by the spraying mechanism, at least a part of the plurality of powder spraying guns corresponds to the surface of the plate strip, and at least one air spraying gun is provided at each of the outsides of both side edges in the width direction of the plate strip, and a distance between each air spraying gun and the corresponding powder spraying gun closest to each other and at each of both side edges in the width direction of the plate strip is 30mm to 200 mm.

The strip powder spraying device described above, wherein each of the gas-spraying guns and each of the powder-spraying guns are capable of moving closer to or away from the strip in a direction perpendicular to the strip.

The plate strip powder spraying device described above, wherein a difference between a distance between each air-jet gun and the plane of the plate strip and a distance between each air-jet gun and the plane of the plate strip is 0mm to 200 mm.

The sheet strip powder spraying device as described above, wherein the air injection pressure of each air injection lance is 0.1MPa to 0.8 MPa.

The strip powder coating device as described above, wherein an upper end of each of the air injection guns is connected to a guide mechanism, and each of the air injection guns is capable of reciprocating in the width direction of the strip by the guide mechanism.

The plate strip powder spraying device is characterized in that the spraying mechanisms are provided with a plurality of groups, and the plurality of groups of spraying mechanisms are arranged at intervals along the length direction of the plate strip.

The plate strip powder spraying device comprises a spraying room, wherein an inlet is formed in the side wall of one end of the spraying room, an outlet opposite to the inlet is formed in the side wall of the other end of the spraying room, and the spraying mechanism is arranged above the inside of the spraying room.

The plate strip powder spraying device is characterized in that the top plate of the spraying room and/or the side walls of the two sides of the spraying room are/is provided with an air inlet, and the bottom plate of the spraying room is provided with a negative pressure air inlet.

The plate strip powder spraying device is characterized in that the plurality of air inlets are formed in the plate strip powder spraying device, and the plurality of air inlets correspond to two sides of the plate strip in the width direction.

The plate strip powder spraying device is characterized in that the negative pressure air suction opening is formed in a central line, parallel to the movement direction of the plate strip, of a bottom plate of the spraying room, two air flow guide plates are arranged inside the spraying room, one side edge of each air flow guide plate is respectively connected with the inner surfaces of the side walls of the two sides of the spraying room, the other side edge of each air flow guide plate is connected with the bottom plate of the spraying room, and the air flow guide plates are connected with the bottom plate of the spraying room and located on the two sides of the negative pressure air suction opening in the width direction of the plate strip.

Compared with the prior art, the utility model has the advantages as follows:

the utility model provides a slab band powder spraying device, through the position according to the jet-propelled spray gun of width adjustment of slab band, the outside that makes the both sides limit of slab band corresponds respectively and is equipped with jet-propelled spray gun, when jet-propelled spray gun jet-propelled, can form the air current wall respectively in the outside on the both sides limit of slab band, effectively prevent the outside drift of each spray-gun spun powder to the both sides of slab band, the spray-gun spun powder that will respectively spray powder keeps in the surface department of slab band, effectively improve the powder volume of powder on slab band surface limit portion region, reduce the loss of powder extravagant, and the powder that is kept in the surface department of slab band can evenly be attached to on the surface of slab band, guarantee the homogeneity of slab band surface powder, thereby guarantee that each department's paint film thickness of slab band surface is unanimous after toasting, improve the product percent of pass.

Drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. Wherein:

fig. 1 is a schematic perspective view of a plate belt powder spraying device provided by the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 1 along direction B;

fig. 4 is a schematic view of the overlooking structure when two air injection spray guns are respectively arranged at two ends of the powder spray gun group of the spraying mechanism of the plate and strip powder spraying device.

The reference numbers illustrate:

1. a spraying mechanism;

11. a powder spraying gun;

12. a gas injection spray gun;

121. a first stage;

122. a second stage;

123. a transition section;

2. plate and strip;

3. spraying a room;

31. an inlet;

32. an outlet;

33. an air inlet;

34. a negative pressure air inlet;

4. an airflow guide plate;

5. a guide rail;

6. a guide wheel group.

Detailed Description

In order to clearly understand the technical solution, purpose and effect of the present invention, the detailed embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present invention provides a plate strip powder spraying apparatus, wherein the plate strip powder spraying apparatus includes at least one group of spraying mechanisms 1, the spraying mechanisms 1 include a powder spraying gun group and at least two air spraying guns 12, the powder spraying gun group includes a plurality of air spraying guns 11 arranged at intervals along the width direction of the plate strip 2, that is, the plurality of air spraying guns 11 are arranged in a row, and each air spraying gun 12 can reciprocate along the width direction of the plate strip 2, during the spraying process, the positions of the air spraying guns 12 are determined by the width of the plate strip 2, specifically, each air spraying gun 11 faces the direction of the plate strip 2, because the width of the plate strip 2 can be various, if the width of the plate strip 2 is exactly the same as the width of the plurality of air spraying guns 11, that is, when each air spraying gun 11 corresponds to the plate strip 2, at least one air spraying gun 12 is respectively arranged at two ends of the powder spraying gun group along the width direction of the plate strip 2, or, if the width of the strip 2 is smaller than the width of the arrangement of the plurality of powder spray guns 11, that is, only a part of the plurality of powder spray guns 11 corresponds to the strip 2, at least one air spray gun 12 is respectively arranged at the outer sides of the powder spray guns 11 corresponding to the two side edges in the width direction of the strip 2, that is, at least one air spray gun 12 moves to the outer sides of the powder spray guns 11 corresponding to the two side edges in the width direction of the strip 2, outside the strip width edge. Thus, as will be described in detail by taking fig. 3 as an example, the powder spraying gun 11 sprays powder downwards towards the strip 2, the powder sprayed by the powder spraying gun 11 directly reaches the surface of the strip 2, the gas spraying gun 12 sprays gas towards the outside of the edges of the two sides of the strip 2 (close to the edges of the two sides of the strip 2), the gas sprayed by the gas spraying gun 12 is not sprayed towards the surface of the strip 2 but sprayed towards the lower part of the strip 2 from the edges of the two sides of the strip 2, so that the gas flow sprayed by the gas spraying gun 12 forms gas flow walls on the two sides of the strip 2, the powder sprayed by the powder spraying gun 11 is kept above the strip 2, the powder is prevented from drifting towards the outside of the two sides of the strip 2 from the edges of the two sides of the strip 2, the powder applying amount on the edge area of the surface of the strip 2 is increased, the loss and waste of the powder is reduced, and the powder, thereby ensuring that the thickness of the paint film at each part of the surface of the baked plate strip 2 is consistent and ensuring the product percent of pass of the electrostatic powder spraying plate strip 2.

Further, as shown in fig. 1, the present invention provides a slab band powder spraying apparatus, wherein the air spraying gun 12 includes a first section 121 and a second section 122 extending in a direction perpendicular to the slab band 2, a lower end of the first section 121 is connected to an upper end of the second section 122 through a transition section 123, so that the air spraying gun 12 is formed into a zigzag shape as a whole, the air spraying gun 12 can rotate around an axis of the first section 121, and thus, the first section 121 drives the transition section 123 and the second section 122 to move along a width direction of the slab band 2 on both sides of the powder spraying gun group in a length direction of the slab band 2, and after reaching a corresponding position, the first section 121 is rotated and drives the transition section 123 and the second section 122 to rotate around the axis of the first section 121, so that the second section 122 can move to be located in a plane perpendicular to the slab band 2 with each powder spraying gun 11, so as to ensure that the strongest part of the airflow sprayed by each air spraying gun 12 is just corresponding to the strongest part of the airflow sprayed by each powder spraying gun 11 and mixed with the powder, and ensure that the airflow wall formed by the airflow sprayed by the air spraying guns 12 has the blocking effect on the powder sprayed by the powder spraying guns 11.

Or, the utility model provides a slab band powder spraying device, wherein, the structure of air injection spray gun 12 can also be as shown in fig. 3, specifically be, air injection spray gun 12 includes the first section 121 that sets up along the direction extension of perpendicular to slab band 2 and rotates articulated and the second section 122 that communicates with the lower extreme of first section 121, second section 122 can use the axis of first section 121 to carry out the circular cone swing that the cone angle is 0 ~ 30, namely second section 122 can swing in a cone angle less than or equal to 30 in the circular cone scope, and the (blowout port of) lower extreme of second section 122 can swing to lie in the plane of same perpendicular to slab band with each spray gun 11, with the air current wall that guarantees air injection spray gun 12 spun air current and form to the best effect of blockking of spray gun 11 spun powder.

Further, as shown in fig. 4, the utility model provides a slab band powder spouts coating device, air injection spray gun 12 can be equipped with four, two liang are in pairs, and per two air injection spray gun 12 set up along slab band 2's length direction interval in pairs, two air injection spray gun 12 that set up in pairs can follow the width direction synchronous motion of slab band, in the spraying process, slab band 2's width direction both sides are equipped with a pair of (two are two and set up in pairs) air injection spray gun 12 respectively, both sides through on slab band 2's width direction set up a pair of air injection spray gun 12 respectively, can improve the intensity and the width of air current wall further, with the effect of blockking of assurance air current wall to the powder, as preferred, the distance between per two air injection spray gun 12 in pairs is 30mm ~ 200mm, with the intensity of assurance air current wall everywhere is comparatively even.

Further, the utility model provides a slab band powder spraying device, wherein, under the state that the coating mechanism carries out the spraying to the slab band, at least some in a plurality of spray gun 11 is corresponding with the surface of slab band 2, and correspond respectively in the outside on the width direction of slab band 2 both sides limit and set up at least one air injection spray gun 12, and each air injection spray gun 12 that is located the outside on the width direction of slab band 2 both sides limit is 30mm ~ 200mm with apart from nearest and with the corresponding spray gun 11 of the width direction both sides edge of slab band 2 between, promptly carrying out the spraying in-process, both sides on the width direction of slab band 2 all are equipped with at least one air injection spray gun 12, specifically, after having confirmed the width of slab band 2, remove each air injection spray gun 12 to the width direction both sides department of slab band 2, and make each air injection spray gun 12 and be located the width direction of slab band 2 with the distance between the spray gun 11 of the same one side edge be in 30mm ~ 200mm mm to ensure that the air flow wall formed by the air flow sprayed by each air spraying gun 12 can effectively block the powder sprayed by each powder spraying gun 11.

Further, as shown in fig. 1 and 3, the utility model provides a slab band powder spraying device, wherein, each spray gun 11 and each jet gun 12 homoenergetic are close to slab band 2 or keep away from slab band 2 along the direction motion of perpendicular to slab band 2, and the distance between each spray gun 11 and slab band 2 and the distance between each jet gun 12 and slab band 2 all can adjust promptly to adapt to different powder and spraying requirements.

Preferably, as shown in fig. 3, the present invention provides a strip powder spraying apparatus, wherein the range of the compressed air sprayed from each air spray gun 12 is formed to be substantially umbrella-shaped, and the range of the powder sprayed from each powder spray gun 11 is also formed to be substantially umbrella-shaped, and when installed, the umbrella-shaped range formed by the compressed air sprayed from the air spray gun 12 and the umbrella-shaped range formed by the powder spray guns 11 located on both sides in the width direction of the strip 2 partially intersect with each other, so that the compressed air sprayed from the air spray gun 12 blocks the powder sprayed from the powder spray guns 11.

As preferred, the utility model provides a slab band powder spraying device, wherein, the difference of the distance between the plane at each jet-propelled spray gun 12 and slab band 2 place and the distance between the plane at each spray-propelled spray gun 11 and slab band 2 place is 0mm ~ 200mm to guarantee that each jet-propelled spray gun 12 spun air current has suitable intensity and blowout form when arriving slab band 2 both sides and effectively blocks that each spray-propelled spray gun 11 spun powder runs off from slab band 2's both sides, it is nevertheless to explain, above-mentioned difference is only the utility model discloses a preferred embodiment, technical personnel in the art can also establish above-mentioned difference into other numerical values, the utility model discloses not use this as the limit.

Preferably, the utility model provides a slab band powder spraying device, wherein, the jet-propelled pressure of each jet-propelled spray gun 12 is 0.1MPa ~ 0.8MPa to guarantee that each jet-propelled spray gun 12 spun air current has sufficient intensity and forms the air current wall that can block the powder and run off.

As shown in fig. 1, the movement of each air injection lance 12 along the width direction of the plate strip 2 can be realized by a guide mechanism, the upper end of each air injection lance 12 is connected with the guide mechanism, the guide mechanism comprises a guide rail 5 and guide wheel sets 6 arranged in one-to-one correspondence with each air injection lance 12, the guide rail 5 extends along the width direction of the plate strip 2, each guide wheel set 6 can reciprocate along the guide rail 5, the upper end of each air injection lance 12 is connected with the corresponding guide wheel set 6, and each air injection lance 12 reciprocates along the guide rail through the corresponding guide wheel set 6; it should be noted that the guiding mechanism may also be a sliding rail and a sliding block, or other structures capable of guiding each air injection lance 12 to move along the width direction of the plate strip 2, and the present invention is not limited thereto.

As preferably, as shown in fig. 1, fig. 2 and fig. 4, the utility model provides a slab band powder spraying device, wherein, spraying mechanism 1 is equipped with the multiunit, and multiunit spraying mechanism 1 sets up along the length direction interval of slab band 2 to improve spraying speed, thereby improve the production speed of slab band 2.

Further, as shown in fig. 1-4, the utility model provides a slab band powder spraying device, wherein, slab band powder spraying device is still including spouting room 3, slab band 2's concrete spraying operation is accomplished in spouting room 3, spout room 3 including two lateral walls with slab band 2's direction of travel vertically tip, two lateral walls and a roof and a bottom plate parallel with slab band 2's direction of travel both sides, seted up entry 31 on the lateral wall of the one end of spouting room 3, set up export 32 relative with entry 31 on the lateral wall of the other end of spouting room 3, spraying mechanism 1 locates the inside top of spouting room 3, slab band 2 is being carried out the in-process of spraying and is got into the inside of spouting room 3 by the entry 31 of the one end of spouting room 3, in-process that slab band 2 removed in spouting room 3, spraying mechanism 1 that the inside top of spouting room 3 set up carries out the spraying operation to slab band 2, and accomplish that 2 after the spraying carries out the technology by the outside that export 32 of the other end of spouting room 3 reachs and spout room 3 and carry out technology on next step The spraying operation is completed in the spraying room 3, so that the powder in the spraying can be effectively prevented from diffusing to the surrounding environment to cause harm to the health of workers, the plate belt 2 for spraying can be protected, impurities in the outside air are prevented from being mixed into the powder and being adhered to the surface of the plate belt 2 in the spraying process, and the spraying quality of the plate belt 2 is ensured.

Further, as shown in fig. 1 and 3, the utility model provides a slab band powder spraying device, wherein, spout roof of room 3 and/or spout and seted up air intake 33 on the lateral wall of room 3's both sides, spout and seted up negative pressure inlet scoop 34 on room 3's the bottom plate, negative pressure inlet scoop 34 department is equipped with negative pressure suction device, the air current that makes the inside of spouting room 3 from top to bottom motion, will not adhere to the powder on slab band 2 surface from negative pressure inlet scoop 34 suction, prevent to spout the interior floated powder diffusion of room 3 and cause harm to staff's health in the surrounding environment.

As preferred, as shown in fig. 1 and 3, the utility model provides a slab band powder spraying device, wherein, air intake 33 has been seted up a plurality ofly, each position department in room 3 is spouted in the even process of air current ability in the room 3 of spouting in order to guarantee, thereby all siphoning away the powder of floating in the air of each position department in the room 3 of spouting, a plurality of air intakes 33 all correspond with slab band 2's width direction's both sides, in order to guarantee to spout the gas circulation path in the room 3 smooth and easy, it produces collision change flow direction and influences the intensity of air current wall and will be located the condition emergence that the powder between spraying mechanism 1 and slab band 2 was taken away with slab band 2 and spraying mechanism 1 to reduce the gas flow in-process in the room 3 of spouting.

Preferably, as shown in fig. 3, the present invention provides a plate strip powder spraying apparatus, wherein the negative pressure air suction ports 34 are opened on a center line of a bottom plate of the spraying room 3 parallel to the moving direction of the plate strip 2, that is, each negative pressure air suction port 34 extends along the length direction of the spraying room 3 (that is, the length direction of the plate strip 2), two air flow guide plates 4 are disposed inside the spraying room 3, one side edges of the two air flow guide plates 4 are respectively connected to the inner surfaces of the side walls at both sides of the spraying room 3, the other side edges of the two air flow guide plates 4 are connected to the bottom plate of the spraying room 3, the positions where the two air flow guide plates 4 are connected to the bottom plate of the spraying room 3 are both located at both sides of the negative pressure air suction ports 34 along the width direction of the plate strip 2, that the two air flow guide plates 4 are disposed obliquely inside the spraying room 3, the distance between the two air flow guide plates 4 is gradually reduced along the width direction of the plate strip 2, so as to guide the air to the negative, so as to reduce the dead angle of the air flow existing in the spraying room 3 and ensure that the air at all positions in the spraying room 3 can be sucked out from the negative pressure air suction opening 34 (namely, discharged from the negative pressure air suction opening 34).

Wherein, the negative pressure air suction inlet 34 can also be provided in a plurality of numbers, and the arrangement of the air flow guide plate 4 can be omitted, the present invention is not limited to this.

In the above embodiments and the accompanying drawings, the case where the strip is horizontally disposed (i.e., horizontally disposed) is taken as an example for description, in addition to that, the strip may be in a vertical state, a state inclined with an included angle (the included angle is not equal to 90 °) with a horizontal plane, and the directions of the powder spray guns 11 and the air spray guns 12 in the spraying mechanism are adjusted according to the direction of the corresponding strip, so as to always maintain the direction perpendicular or approximately perpendicular to the strip, which is not limited by the present invention.

Compared with the prior art, the utility model has the advantages as follows:

the utility model provides a slab band powder spraying device, the outside through the both sides limit at the slab band corresponds respectively and sets up air-jet spray gun, when air-jet spray gun spouts gas-jet, can form the air current wall respectively in the outside on the both sides limit of slab band, effectively prevent each spray gun spun powder to the outside drift of the both sides of slab band, the surface department at the slab band of spray gun spun powder is kept to each spray gun spun powder, effectively improve the powder volume of going to powder on slab band surface width direction limit portion region, reduce the loss of powder and waste, and the powder that is kept in the surface department of slab band can evenly be attached to on the surface of slab band, guarantee the homogeneity that the slab band is going to powder on the surface, thereby guarantee that the slab band surface each department's film thickness is unanimous after toasting, improve the product percent of pass of electrostatic.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims (10)

1. The plate and strip powder spraying device is characterized by comprising at least one spraying mechanism, wherein the spraying mechanism comprises a powder spray gun group and at least two air injection spray guns, the powder spray gun group comprises a plurality of powder spray guns arranged at intervals along the width direction of a plate strip, each air injection spray gun can reciprocate along the width direction of the plate strip, and each air injection spray gun can move to the two ends of the powder spray gun group along the width direction of the plate strip or move between two adjacent powder spray guns of the powder spray gun group.

2. A strip powder coating apparatus as defined in claim 1, wherein the spray gun includes a first section and a second section extending in a direction perpendicular to the strip, the first section and the second section are connected to each other via a transition section, the spray gun is rotatable about an axis of the first section, and the second section is movable to be located in a same plane perpendicular to the strip as each spray gun.

3. A strip powder coating apparatus as defined in claim 1, wherein the gas injection lance includes a first segment extending in a direction perpendicular to the strip and a second segment pivotally connected to and communicating with a lower end of the first segment, the second segment being capable of conical oscillation about an axis of the first segment at a cone angle of 0 ° to 30 °, and the lower end of the second segment being capable of oscillating to lie in the same plane perpendicular to the strip as each of the powder injection lances.

4. A strip powder spraying apparatus according to any one of claims 1 to 3, wherein four air injection lances are provided, and every two air injection lances are spaced in pairs along a length direction of the strip, the two air injection lances provided in pairs are capable of moving synchronously in a width direction of the strip, and a distance between every two air injection lances provided in pairs is 30mm to 200 mm.

5. A strip powder coating apparatus according to any one of claims 1 to 3, wherein at least some of the plurality of powder spray guns correspond to the surface of the strip in a state where the coating mechanism coats the strip, at least one of the plurality of gas spray guns is provided to correspond to each of the outer sides of both side edges in the width direction of the strip, and the distance between each of the plurality of gas spray guns and the closest one of the plurality of powder spray guns corresponding to both side edges in the width direction of the strip is 30mm to 200 mm.

6. A strip powder coating apparatus according to any one of claims 1 to 3, wherein each of the gas spray guns and each of the powder spray guns are movable towards and away from the strip in a direction perpendicular to the strip.

7. A strip powder coating apparatus according to any one of claims 1 to 3, wherein a difference between a distance between each of the gas spray guns and a plane in which the strip is located and a distance between each of the gas spray guns and the plane in which the strip is located is 0mm to 200 mm.

8. A strip powder coating apparatus according to claim 2 or 3, wherein each of the air blast guns has an upper end connected to a guide mechanism, and is capable of reciprocating in a width direction of the strip by the guide mechanism.

9. A plate and strip powder spraying device as claimed in any one of claims 1 to 3, wherein the device further comprises a spraying room, wherein air inlets are formed in a top plate of the spraying room and/or side walls of two sides of the spraying room, and the air inlets correspond to one of two sides of the plate and strip in the width direction.

10. A plate strip powder spraying device as claimed in claim 9, wherein a negative pressure air suction port is formed in a bottom plate of the spraying chamber, the negative pressure air suction port is located on a center line of the bottom plate of the spraying chamber, which is parallel to the movement direction of the plate strip, two air flow guide plates are arranged inside the spraying chamber, one side edges of the two air flow guide plates are respectively connected with inner surfaces of side walls on two sides of the spraying chamber, the other side edges of the two air flow guide plates are connected with the bottom plate of the spraying chamber, and the connection positions of the two air flow guide plates and the bottom plate of the spraying chamber are located on two sides of the negative pressure air suction port in the width direction of the plate strip.

Images