CN113663849A

CN113663849A - Spraying device for metal coating processing

Info

Publication number: CN113663849A
Application number: CN202111018345.6A
Authority: CN
Inventors: 曲作鹏; 田欣利; 王海军; 赵文博; 蔡墨朗
Original assignee: Jiangsu Kehuan Innovative Material Co ltd; North China Electric Power University
Current assignee: Jiangsu Kehuan Innovative Material Co ltd; North China Electric Power University
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-19

Abstract

The invention discloses a spraying device for processing a metal coating, which relates to the technical field of spraying devices, and adopts the technical scheme that the spraying device comprises a spray gun and a connecting plate, wherein the connecting plate is positioned below the spray gun, the top of the connecting plate is provided with a connecting rod, the spray gun is hinged with the connecting rod through a hinge, the spray gun is connected with a first driving piece which drives the spray gun to rotate and lift simultaneously, and the spraying device has the effects that a third gear is driven to rotate through rotating a supporting shaft, so that a rack can be driven to slide in an inner cavity of a strip-shaped sleeve, the distance between two arc-shaped sleeves can be adjusted, a second motor can be started to drive the arc-shaped sleeves to rotate, a movable rod is lifted in the vertical direction to drive a fixed block to move along the movable rod, the fixed block is driven to stretch and retract by lifting the fixed block due to the fact that the first telescopic rod is fixedly arranged at one end of the spray gun, and finally the spray gun is driven to swing along the hinge between the spray gun and the connecting rod, the swing amplitude of the spray gun can be adjusted by changing the distance between the two arc-shaped sleeves.

Description

Spraying device for metal coating processing

Technical Field

The invention relates to the technical field of spraying devices, in particular to a spraying device for processing a metal coating.

Background

The spray coating is applied to the surface of the object to be coated by dispersing into uniform and fine droplets by means of a spray gun or a disc atomizer by means of pressure or centrifugal force.

Spray finishing can realize the restoration to the spare part surface, carries out the spraying to the spare part before, mostly adopts manual spraying, along with the discovery of science and technology, uses mechanical spraying now to replace manual spraying greatly, and mechanical spraying can realize the reciprocating type spray finishing to the spare part, but the wobbling scope of spraying is mostly fixed, can not adjust, has certain limitation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a spraying device for processing a metal coating, wherein the spraying swing area is adjustable.

In order to achieve the purpose, the invention provides the following technical scheme: a spraying device for processing a metal coating comprises a spray gun and a connecting plate, wherein the connecting plate is positioned below the spray gun, the top of the connecting plate is provided with a connecting rod, the spray gun is hinged with the connecting rod through a hinge, the spray gun is connected with a first driving piece which drives the spray gun to rotate and lift at the same time, and the spray gun is also connected with a second driving piece which drives the spray gun to swing along the hinge between the spray gun and the connecting rod;

the second driving piece comprises a first telescopic rod, the first telescopic rod is fixedly installed on one side of the spray gun, a third driving piece for driving the first telescopic rod to keep away from one end, where the spray gun is located, of the first telescopic rod to ascend and descend in the vertical direction is arranged at the top of the connecting plate, and the height of one end, where the spray gun is located, of the first telescopic rod to ascend and descend in the vertical direction is adjustable.

Preferably, the first driving part comprises a screw rod, a bottom plate is arranged below the connecting plate, a first motor is fixedly mounted at one end of the top of the bottom plate, the screw rod is fixedly connected with an output shaft of the first motor, the connecting plate is in threaded connection with the screw rod, a limiting rod is fixedly mounted at the top of the bottom plate, the connecting plate is in sliding connection with the limiting rod, the connecting rod is connected with the connecting plate through a first connecting piece, and when the screw rod rotates, the connecting rod rotates along with the screw rod.

Preferably, the connecting piece includes first gear and second gear, the second gear is located the top of screw rod, the top fixedly connected with roller bearing of connecting plate, first gear activity cup joints the top at the roller bearing, connecting rod fixed mounting deviates from the one side at roller bearing place at first gear, connect through the toothed belt transmission between first gear and the second gear, the size of first gear and second gear equals, and first gear and second gear are on same horizontal plane, be connected through the second connecting piece between second gear and screw rod and the connecting plate, when the screw rod rotates, the second gear follows the screw rod and rotates, and second gear and first gear are on same horizontal plane all the time.

Preferably, the second connecting piece includes the slide bar, slide bar and the inner chamber sliding connection of screw rod, and the top of slide bar extends the top of screw rod, and second gear fixed mounting is equipped with the locating part at the top of slide bar between the inner chamber of slide bar and screw rod, and the draw-in groove has been seted up at the outlying top of slide bar, and the inside swing joint of draw-in groove has the kicking block, and the top fixed connection of dead lever and connecting plate is all passed through at the both ends of kicking block bottom.

Preferably, the limiting member comprises cylindrical protrusions which are distributed on the periphery of the sliding rod at equal intervals, and the inner cavity of the screw rod is provided with a placing groove for placing the cylindrical protrusions on the periphery of the sliding rod.

Preferably, the third driving piece includes the fixed block, the fixed block is articulated with the one end that spray gun place was kept away from to first telescopic link, the one end fixedly connected with movable rod at first telescopic link place is kept away from to the fixed block, the fixed cover in connecting rod outlying top has cup jointed the lagging, the top fixed mounting of cup slab has spacing frame, the perforation that supplies the movable rod to pass is seted up to spacing frame's inner chamber, and the movable rod is located the perforation that spacing frame inner chamber was seted up, the top of cup slab is equipped with the fourth driving piece of drive movable rod ascending and descending in vertical direction.

Preferably, the fourth drive piece includes the second motor, the bottom fixed mounting of movable rod has the flat board, dull and stereotyped below is equipped with the arc piece, the quantity of arc piece is two, and two arc pieces are placed relatively, connect through the tensioning member between the relative one side of two arc pieces, and the adjustable length of tensioning member, the middle part of two arc pieces is equipped with the circle piece, the one end that the both sides of circle piece are close to arc piece place all is through second telescopic link and arc piece fixed connection, the top fixed mounting of lagging has a supporting bench, second motor fixed mounting is at a supporting bench's top, and the output shaft and the circle piece fixed connection of second motor, contact between flat board and the arc piece.

Preferably, the top of spray gun is equipped with the feed inlet, is equipped with the seal cover on the feed inlet, and one side of spray gun is equipped with the spout, and first telescopic link fixed mounting is in one side that the spout place was kept away from to the spray gun.

Preferably, the bottom of the deck is provided with a support for supporting the deck.

Preferably, the support member comprises a support rod which is fixedly installed at the top of the connecting plate, the top of the support rod is connected with balls which are distributed at equal intervals in a rolling mode, and the balls are in contact with the bottom of the sleeve plate.

Compared with the prior art, the invention has the following beneficial effects:

the third gear is driven to rotate through the rotating support shaft, so that the rack can be driven to slide in the inner cavity of the strip-shaped sleeve, the distance between the two arc-shaped sleeves is adjusted, the second motor is started to drive the arc-shaped sleeves to rotate, the movable rod is lifted in the vertical direction to drive the fixed block to move along with the movable rod, the fixed block is lifted to drive the first telescopic rod to stretch and retract due to the fact that the first telescopic rod is fixedly installed at one end of the spray gun, the spray gun is finally driven to swing along the hinged position between the spray gun and the connecting rod, and the swing amplitude of the spray gun can be adjusted by changing the distance between the two arc-shaped sleeves.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a spray gun according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of a flat plate structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of a rack and bar sleeve connection according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of the embodiment of the present invention at the position of the insertion rod;

fig. 6 is a schematic structural diagram of a fixing rod according to an embodiment of the present invention.

1. A base plate; 2. a first motor; 3. a screw; 4. a connecting plate; 5. fixing the rod; 6. a toothed belt; 7. a top block; 8. a support bar; 9. a ball bearing; 10. a spray gun; 11. sheathing; 12. a connecting rod; 13. a limiting rod; 14. a first telescopic rod; 15. a fixed block; 16. a movable rod; 17. a flat plate; 18. a limiting frame; 19. an articulation member; 20. a strip-shaped sleeve; 21. a second telescopic rod; 22. an arc-shaped block; 23. a support table; 24. a second motor; 25. a round block; 26. a cross bar; 27. a rack; 28. a support shaft; 29. a third gear; 30. a fixed cylinder; 31. a spring; 32. inserting a rod; 33. a slide plate; 34. a first gear; 35. a roller; 36. a second gear; 37. a slide bar; 38. and (4) a columnar protrusion.

Detailed Description

An embodiment of a spraying apparatus for processing a metal coating according to the present invention will be further described with reference to fig. 1 to 6.

Referring to fig. 1 and 2, a spraying device for processing a metal coating comprises a spray gun 10 and a connecting plate 4, wherein the connecting plate 4 is positioned below the spray gun 10, the top of the connecting plate 4 is provided with a connecting rod 12, the spray gun 10 is hinged with the connecting rod 12 through a hinge piece 19, the spray gun 10 is connected with a first driving piece which drives the spray gun 10 to rotate and lift at the same time, and the spray gun 10 is also connected with a second driving piece which drives the spray gun 10 to swing along the hinge joint between the spray gun 10 and the connecting rod 12;

the second driving piece comprises a first telescopic rod 14, the first telescopic rod 14 is fixedly installed on one side of the spray gun 10, a third driving piece for driving the first telescopic rod 14 to ascend and descend in the vertical direction far away from one end where the spray gun 10 is located is arranged at the top of the connecting plate 4, and the height of the first telescopic rod 14, far away from one end where the spray gun 10 is located, ascending and descending in the vertical direction is adjustable. Utilize first driving piece drive spray gun 10 to rotate, utilize the first telescopic link 14 of third driving piece drive to keep away from the one end at spray gun 10 place and go up and down in vertical direction simultaneously, because first telescopic link 14 fixed mounting is in one side of spray gun 10, spray gun 10 can swing along the articulated department between spray gun 10 and connecting rod 12 like this, because the height-adjustable that the one end at spray gun 10 place was kept away from to first telescopic link 14 goes up and down in vertical direction, the range of swing of articulated department between spray gun 10 and connecting rod 12 is also adjustable like this, people can adjust according to the needs of spraying.

See fig. 1, the first driving piece includes screw rod 3, bottom plate 1 is equipped with below connecting plate 4, the one end fixed mounting at bottom plate 1 top has first motor 2, screw rod 3 and the output shaft fixed connection of first motor 2, connecting

plate

4 and 3 threaded connection of screw rod, the top fixed mounting of bottom plate 1 has gag lever post 13, sliding connection between connecting plate 4 and the gag lever post 13, be connected through first connecting piece between connecting rod 12 and the connecting plate 4, when screw rod 3 rotated, connecting rod 12 followed screw rod 3 and rotated. Start first motor 2, then screw rod 3 rotates and drives connecting plate 4 and slide along screw rod 3's axial, gag lever post 13 plays the effect of injecing to connecting plate 4, make screw rod 3 when sliding, connecting plate 4 can slide along gag lever post 13's axial, the axial of gag lever post 13 is unanimous with screw rod 3's axial, because be connected through first connecting piece between connecting rod 12 and the connecting plate 4, when screw rod 3 rotated, connecting rod 12 followed screw rod 3 and rotated, spray gun 10 follows connecting rod 12 and rotates like this.

Referring to fig. 1 and 6, the connecting member includes a first gear 34 and a second gear 36, the second gear 36 is located above the screw 3, the top of the connecting plate 4 is fixedly connected with a roller 35, the first gear 34 is movably sleeved on the top of the roller 35, the connecting rod 12 is fixedly mounted on the side of the first gear 34 away from the roller 35, the first gear 34 and the second gear 36 are in transmission connection through a toothed belt 6, the first gear 34 and the second gear 36 are equal in size, the first gear 34 and the second gear 36 are on the same horizontal plane, the second gear 36 is connected with the screw 3 and the connecting plate 4 through a second connecting member, when the screw 3 rotates, the second gear 36 rotates along with the screw 3, and the second gear 36 and the first gear 34 are always on the same horizontal plane.

Referring to fig. 1 and 6, the second connecting member includes a slide bar 37, the slide bar 37 is slidably connected with an inner cavity of the screw rod 3, the top of the slide bar 37 extends out of the top of the screw rod 3, a second gear 36 is fixedly mounted at the top of the slide bar 37, a limiting member is arranged between the slide bar 37 and the inner cavity of the screw rod 3, a clamping groove is formed in the top of the periphery of the slide bar 37, an ejecting block 7 is movably connected inside the clamping groove, and two ends of the bottom of the ejecting block 7 are fixedly connected with the top of the connecting plate 4 through a fixing rod 5. When connecting plate 4 along the axial slip of screw rod 3, first gear 34 slides along connecting plate 4, because the existence of locating part, when screw rod 3 rotated, second gear 36 followed screw rod 3 and rotated, then toothed belt 6 rotated and will drive first gear 34 and rotate, because the setting of dead lever 5, when connecting plate 4 along the axial slip of screw rod 3, second gear 36 followed connecting plate 4 and moved, guarantee like this that second gear 36 and first gear 34 are on same horizontal plane all the time, thereby effectively avoid toothed belt 6 to take place the skew, guarantee to keep stable when toothed belt 6 rotates.

Referring to fig. 6, the position limiting member includes cylindrical protrusions 38, the cylindrical protrusions 38 are equidistantly distributed on the periphery of the sliding rod 37, and the inner cavity of the screw rod 3 is provided with a placement groove for placing the cylindrical protrusions 38 on the periphery of the sliding rod 37. When the screw 3 is rotated, the slide rod 37 is rotated in synchronization with the screw 3 due to the cylindrical projection 38.

See fig. 2 and 3, the third driving piece includes fixed block 15, fixed block 15 is articulated with the one end that spray gun 10 place was kept away from to first telescopic link 14, fixed block 15 keeps away from the one end fixedly connected with movable rod 16 that first telescopic link 14 was located, the fixed cover in the outlying top of connecting rod 12 has connect lagging 11, the top fixed mounting of lagging 11 has spacing frame 18, the perforation that supplies movable rod 16 to pass is seted up to the inner chamber of spacing frame 18, and movable rod 16 is located the perforation that spacing frame 18 inner chamber was seted up, the top of lagging 11 is equipped with the fourth driving piece that drives movable rod 16 and rise and fall in vertical direction. Utilize fourth drive piece drive movable rod 16 to go up and down in vertical direction, go up and down in vertical direction with movable rod 16 fixed connection's fixed block 15, because fixed block 15 is articulated with first telescopic link 14, and spacing frame 18 plays the effect of injecing to movable rod 16, make movable rod 16 at the in-process that goes up and down, do not take place the skew, fixed block 15 is at the in-process that goes up and down like this, make first telescopic link 14 flexible, thereby drive spray gun 10 and rotate along the articulated department of spray gun 10 and connecting rod 12.

See fig. 3, the fourth drive piece includes second motor 24, the bottom fixed mounting of movable rod 16 has dull and stereotyped 17, dull and stereotyped 17's below is equipped with arc piece 22, the quantity of arc piece 22 is two, and two arc pieces 22 are placed relatively, connect through the tensioning member between the relative one side of two arc pieces 22, and the length of tensioning member is adjustable, the middle part of two arc pieces 22 is equipped with circle piece 25, the one end that the both sides of circle piece 25 are close to arc piece 22 place is all through second telescopic link 21 and arc piece 22 fixed connection, the top fixed mounting of lagging 11 has a supporting bench 23, second motor 24 fixed mounting is at the top of supporting bench 23, and second motor 24's output shaft and circle piece 25 fixed connection, contact between dull and stereotyped 17 and the arc piece 22. Start second motor 24, then second motor 24 rotates and drives arc piece 22 and tensile piece and rotate, and arc piece 22 rotates with tensile piece and drives dull and stereotyped 17 and rise in vertical direction, and then drives movable rod 16 and rise in vertical direction, and people can adjust the length of tensile piece as required, just so can adjust the scope that movable rod 16 goes up and down.

Referring to fig. 2, a feed inlet is formed in the top of the spray gun 10, a sealing sleeve is arranged on the feed inlet, a nozzle is arranged on one side of the spray gun 10, and a first telescopic rod 14 is fixedly installed on one side, far away from the nozzle, of the spray gun 10. When the nozzle on the spray gun 10 sprays, the first telescopic rod 14 does not obstruct the spraying of the spray gun 10.

Referring to fig. 1, the bottom of the deck 11 is provided with a support member for supporting the deck 11.

Referring to fig. 1, the supporting member includes a supporting rod 8, the supporting rod 8 is fixedly installed on the top of the connecting plate 4, the top of the supporting rod 8 is connected with balls 9 which are distributed at equal intervals in a rolling manner, and the balls 9 are in contact with the bottom of the sleeve plate 11. The lagging 11 follows connecting rod 12 and rotates, and the bracing piece 8 plays the effect of support to lagging 11 for lagging 11 is at gliding in-process remain stable, and the setting of ball 9 reduces the resistance that lagging 11 received at the slip in-process, makes lagging 11 can rotate smoothly.

See fig. 3, the stretching member includes two racks 27 and two bar sleeves 20, the two racks 27 and the two bar sleeves 20 are respectively installed at two ends of one side of the two arc blocks 22 opposite to each other, and the two racks 27 are far away from the one end where the bar sleeves 20 are located and are fixedly connected through the cross bar 26, a sliding groove for sliding the racks 27 is formed in the inner cavity of the bar sleeve 20, the racks 27 slide along the sliding groove formed in the inner cavity of the bar sleeve 20, and a fixing member for fixing the racks 27 is arranged inside the bar sleeve 20. The rack 27 is stretched along the inner cavity of the strip sleeve 20, so that the distance between the two arc blocks 22 can be adjusted, the round block 25 is positioned between the two arc blocks 22, and the lifting amplitude of the movable rod 16 can be adjusted by adjusting the distance between the two arc blocks 22.

Referring to fig. 4 and 5, the fixing member includes a third gear 29, the third gear 29 is located inside the bar-shaped sleeve 20, the middle portion of the third gear 29 is movably connected with the inner cavity of the bar-shaped sleeve 20 through a support shaft 28, a rack 27 is engaged with one side of the third gear 29, one side of the support shaft 28, which is far away from the third gear 29, extends out of the bar-shaped sleeve 20, one side of the support shaft 28, which is far away from the third gear 29, is provided with an annular protrusion, the periphery of the support shaft 28 is fixedly sleeved with a fixed cylinder 30, the fixed cylinder 30 is located outside the bar-shaped sleeve 20, the bottom of the fixed cylinder 30 is of an open structure, the bottom of the inner cavity of the fixed cylinder 30 is provided with a groove, the inner portion of the groove is slidably connected with a sliding plate 33, two ends of the sliding plate 33 are provided with bar-shaped protrusions, and the bar-shaped protrusions at two ends of the sliding plate 33 extend out of the fixed cylinder 30, the side wall of the inner cavity of the fixed cylinder 30 is provided with a sliding opening for the bar-shaped protrusions at two ends of the sliding plate 33, strip protruding portion in slide 33 both ends is in the inside of sliding opening, through spring 31 fixed connection between slide 33 is close to one side of recess and the tank bottom of recess, and slide 33 deviates from the one end fixed mounting at spring 31 place and has a plurality of inserted bars 32, and a plurality of inserted bars 32 are the annular and distribute, and the slot that supplies inserted bar 32 to put into that is the annular and distribute is seted up to the outside of bar cover 20. The third gear 29 can be driven to rotate by rotating the supporting shaft 28, and the third gear 29 is meshed with the rack 27, so that the rack 27 can be driven to slide along the inner cavity of the strip-shaped sleeve 20, and further the distance between the two arc-shaped blocks 22 can be changed, before the supporting shaft 28 is rotated, the strip-shaped protrusions at the two ends of the sliding plate 33 are stretched towards the end far away from the strip-shaped sleeve 20, at the moment, the inserted rod 32 leaves the slot formed in the strip-shaped sleeve 20, the supporting shaft 28 is rotated, when the rack 27 reaches a proper position, the strip-shaped protrusions at the two ends of the sliding plate 33 are released, and at the moment, the inserted rod 32 is inserted into the annular slot formed in the strip-shaped sleeve 20, so that the supporting shaft 28 is kept stable, and further, the third gear 29 is kept stable, and at the rack 27 and the third gear 29 are kept stable.

The working principle is as follows: the spray gun 10 swings along the hinged position between the spray gun 10 and the connecting rod 12, the distance between the two arc-shaped blocks 22 is adjusted according to the swing amplitude required by the spray gun 10, the supporting shaft 28 is rotated, the third gear 29 rotates, the rack 27 can be driven to slide along the inner cavity of the strip-shaped sleeve 20 due to the meshing of the third gear 29 and the rack 27, the distance between the two arc-shaped blocks 22 is further changed, the strip-shaped protrusions at the two ends of the sliding plate 33 are stretched towards the end far away from the strip-shaped sleeve 20 before the supporting shaft 28 is rotated, the inserting rod 32 leaves the slot formed in the strip-shaped sleeve 20 at the moment, the supporting shaft 28 is rotated, when the rack 27 reaches a proper position, the strip-shaped protrusions at the two ends of the sliding plate 33 are released, the inserting rod 32 is inserted into the annular slot formed in the strip-shaped sleeve 20 at the moment, the supporting shaft 28 is kept stable, and the rack 27 and the third gear 29 are kept stable at the moment, the second motor 24 is started, the second motor 24 rotates to drive the arc block 22, the rack 27 and the bar sleeve 20 to rotate, the arc block 22, the rack 27 and the bar sleeve 20 rotate to drive the flat plate 17 to ascend and descend in the vertical direction, and further drive the movable rod 16 to ascend and descend in the vertical direction, the limiting frame 18 plays a limiting role on the movable rod 16, so that the movable rod 16 does not deviate in the ascending and descending process, because the fixed block 15 is hinged with the first telescopic rod 14, the fixed block 15 ascends and descends in the vertical direction, and in the ascending and descending process, the first telescopic rod 14 stretches and contracts, so as to drive the spray gun 10 to rotate along the hinged part of the spray gun 10 and the connecting rod 12, and meanwhile, the first motor 2 is started, the screw rod 3 rotates to drive the connecting plate 4 to slide along the axial direction of the screw rod 3, when the screw rod 3 rotates, the connecting rod 12 rotates along with the screw rod 3, so that the spray gun 10 rotates along with the connecting rod 12, the height of the spray gun 10 is adjusted during the rotation, and the spray gun 10 rotates along the hinge joint of the spray gun 10 and the connecting rod 12.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A spraying device for processing a metal coating is characterized in that: the automatic spray gun lifting device comprises a spray gun (10) and a connecting plate (4), wherein the connecting plate (4) is located below the spray gun (10), the top of the connecting plate (4) is provided with a connecting rod (12), the spray gun (10) is hinged to the connecting rod (12) through a hinge piece (19), the spray gun (10) is connected with a first driving piece which drives the spray gun (10) to rotate and lift simultaneously, and the spray gun (10) is further connected with a second driving piece which drives the spray gun (10) to swing along the hinge joint between the spray gun (10) and the connecting rod (12);

the second driving piece comprises a first telescopic rod (14), the first telescopic rod (14) is fixedly installed on one side of the spray gun (10), a third driving piece for driving the first telescopic rod (14) to lift in the vertical direction is arranged at the top of the connecting plate (4), and the height of the first telescopic rod (14) which is far away from one end of the spray gun (10) can be adjusted in the vertical direction.

2. The coating apparatus as claimed in claim 1, wherein: first driving piece includes screw rod (3), the below of connecting plate (4) is equipped with bottom plate (1), the one end fixed mounting at bottom plate (1) top has first motor (2), the output shaft fixed connection of screw rod (3) and first motor (2), connecting plate (4) and screw rod (3) threaded connection, the top fixed mounting of bottom plate (1) has gag lever post (13), sliding connection between connecting plate (4) and gag lever post (13), be connected through first connecting piece between connecting rod (12) and connecting plate (4), when screw rod (3) rotated, connecting rod (12) followed screw rod (3) and rotated.

3. The coating apparatus for metal coating processing as set forth in claim 2, wherein: the connecting piece comprises a first gear (34) and a second gear (36), the second gear (36) is located above the screw (3), the top of the connecting plate (4) is fixedly connected with a roller (35), the first gear (34) is movably sleeved on the top of the roller (35), the connecting rod (12) is fixedly installed on one side of the first gear (34) departing from the roller (35), the first gear (34) is in transmission connection with the second gear (36) through a toothed belt (6), the first gear (34) and the second gear (36) are equal in size, the first gear (34) and the second gear (36) are on the same horizontal plane, the second gear (36) is connected with the screw rod (3) and the connecting plate (4) through a second connecting piece, when the screw rod (3) rotates, the second gear (36) rotates along with the screw rod (3), and the second gear (36) and the first gear (34) are always on the same horizontal plane.

4. The coating apparatus as claimed in claim 3, wherein: the second connecting piece includes slide bar (37), the inner chamber sliding connection of slide bar (37) and screw rod (3), and the top of slide bar (37) extends the top of screw rod (3), second gear (36) fixed mounting is at the top of slide bar (37), be equipped with the locating part between the inner chamber of slide bar (37) and screw rod (3), the draw-in groove has been seted up at slide bar (37) outlying top, the inside swing joint of draw-in groove has kicking block (7), the top fixed connection of dead lever (5) and connecting plate (4) is all passed through at the both ends of kicking block (7) bottom.

5. The coating apparatus as claimed in claim 4, wherein: the limiting piece comprises cylindrical protrusions (38), the cylindrical protrusions (38) are distributed on the periphery of the sliding rod (37) at equal intervals, and a placing groove for the cylindrical protrusions (38) on the periphery of the sliding rod (37) to be partially placed is formed in an inner cavity of the screw rod (3).

6. The coating apparatus as claimed in claim 1, wherein: the third driving piece includes fixed block (15), fixed block (15) are kept away from the one end at spray gun (10) place with first telescopic link (14) and are articulated, the one end fixedly connected with movable rod (16) at first telescopic link (14) place is kept away from in fixed block (15), sleeve plate (11) have been fixed to have cup jointed at connecting rod (12) outlying top, the top fixed mounting of sleeve plate (11) has spacing frame (18), the perforation that supplies movable rod (16) to pass is seted up to the inner chamber of spacing frame (18), and movable rod (16) are located the perforation that spacing frame (18) inner chamber was seted up, the top of sleeve plate (11) is equipped with the fourth driving piece that drives movable rod (16) and rise and fall in vertical direction.

7. The coating apparatus as claimed in claim 6, wherein: the fourth driving part comprises a second motor (24), a flat plate (17) is fixedly arranged at the bottom of the movable rod (16), arc-shaped blocks (22) are arranged below the flat plate (17), the number of the arc-shaped blocks (22) is two, the two arc blocks (22) are oppositely arranged, the opposite sides of the two arc blocks (22) are connected through a stretching piece, the length of the stretching piece is adjustable, the middle parts of the two arc-shaped blocks (22) are provided with round blocks (25), one ends of the two sides of the round blocks (25) close to the arc-shaped blocks (22) are fixedly connected with the arc-shaped blocks (22) through second telescopic rods (21), the top of the sleeve plate (11) is fixedly provided with a supporting table (23), a second motor (24) is fixedly arranged at the top of the supporting table (23), and the output shaft of the second motor (24) is fixedly connected with the round block (25), and the flat plate (17) is contacted with the arc-shaped block (22).

8. The coating apparatus as claimed in claim 1, wherein: the top of spray gun (10) is equipped with the feed inlet, is equipped with the seal cover on the feed inlet, and one side of spray gun (10) is equipped with the spout, and first telescopic link (14) fixed mounting is in one side that spout place was kept away from in spray gun (10).

9. The coating apparatus as claimed in claim 6, wherein: the bottom of the sleeve plate (11) is provided with a supporting piece for supporting the sleeve plate (11).

10. The coating apparatus as claimed in claim 9, wherein: the supporting piece comprises a supporting rod (8), the supporting rod (8) is fixedly installed at the top of the connecting plate (4), balls (9) distributed at equal intervals are connected to the top of the supporting rod (8) in a rolling mode, and the balls (9) are in contact with the bottom of the sleeve plate (11).