CN113231218A

CN113231218A - Spray bar assembly and spray bar system

Info

Publication number: CN113231218A
Application number: CN202110566336.4A
Authority: CN
Inventors: 吴传军; 涂松
Original assignee: Wanhua Chemical Group Co Ltd
Current assignee: Wanhua Chemical Group Co Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-08-10
Anticipated expiration: 2041-05-24
Also published as: WO2022247807A1; CN113231218B

Abstract

The application discloses spray bar subassembly and spray bar system, which comprises a spray head, spray bar and cylinder, the spray bar includes the outer tube and is used for carrying the intermediate pipe of spraying medium, the intermediate pipe nestification is in the outer tube, and separate into first threading die cavity with the inside of outer tube, second threading die cavity, compressed air chamber, atomizing air chamber, first threading die cavity is used for laying the power cord, second threading die cavity is used for laying the signal line, be provided with first mounting hole and second mounting hole on the outer tube, the shower nozzle is installed in first mounting hole, the cylinder is installed in the second mounting hole, and pass compressed air chamber and be connected with the shower nozzle, compressed air chamber is to the cylinder air feed, with control cylinder work, cylinder control shower nozzle switching, atomizing air chamber supplies gas in the shower nozzle, be provided with the liquid outlet on the intermediate pipe, the liquid outlet supplies spraying medium to the shower nozzle. Utilize the connection setting of this application reducible pipeline, simplify the wiring flow, reduce occupation space, simple structure moreover, it is with low costs.

Description

Spray bar assembly and spray bar system

Technical Field

The application relates to the technical field of spraying, in particular to a spray rod assembly and a spray rod system.

Background

At present, all spray heads used in the automatic spraying industry are connected with all pipelines and independently receive process materials, power gas, atomizing gas and the like. The inventor discovers that a plurality of inlets are required to be arranged on the existing spray head to be connected with each pipeline, wiring is complex, and occupied space is large in the process of realizing the spray head.

Disclosure of Invention

In view of the above, the present application provides a spray bar assembly and a spray bar system to solve the above technical problems.

The application provides a spray rod assembly, which comprises a spray head, a spray rod and a cylinder, wherein the spray rod comprises an outer pipe and a middle pipe used for conveying a spraying medium, the middle pipe is nested in the outer pipe, and the interior of the outer tube is divided into a first threading cavity, a second threading cavity, a compressed air cavity and an atomized air cavity, the first threading cavity is used for laying a power line, the second threading cavity is used for laying a signal line, the outer pipe is provided with a first mounting hole and a second mounting hole, the spray head is mounted in the first mounting hole, the air cylinder is mounted in the second mounting hole and connected with the spray head through a compressed air cavity, the compressed air cavity supplies air to the air cylinder, the device comprises a control cylinder, a spray head, an atomizing air cavity, a middle pipe and a spray head, wherein the control cylinder works, the air cylinder controls the spray head to open and close, the atomizing air cavity supplies atomizing air to the spray head, the middle pipe is provided with a liquid outlet, and the liquid outlet supplies spraying media to the spray head.

Optionally, the spray bar further comprises: the inner tube, the inner tube laminating is installed on the inner tube wall of intermediate tube, the liquid outlet runs through intermediate tube and inner tube, form the heating die cavity between intermediate tube and the inner tube, the heating die cavity holds the conduction oil, the spraying medium is carried to the inner tube, still be provided with the heating rod in the heating die cavity and measure the temperature element of conduction oil temperature, the heating rod heating the conduction oil, temperature element and heating rod all are connected with power cord and signal line.

Optionally, the outer tube is a rectangular tube, the lower end face of the middle tube facing the first mounting hole is parallel to the lower side tube wall of the rectangular tube, the lower end face extends out of the first extension plate and the second extension plate, the first extension plate and the second extension plate are both perpendicularly connected with the lower side tube wall, the first extension plate, the middle tube and the outer tube enclose an atomizing air cavity, the second extension plate, the middle tube and the outer tube enclose a compressed air cavity, the first extension plate, the second extension plate, the middle tube and the outer tube enclose a mounting cavity, the side wall of the spray head is respectively attached to the lower side tube walls of the first extension plate, the second extension plate and the middle tube, the first extension plate is provided with an air outlet, the air outlet is communicated with the spray head, and the atomizing air cavity supplies atomizing air to the spray head through the air outlet.

Optionally, the outer tube includes body, left end lid and right-hand member lid, the both ends of left end lid and right-hand member lid shutoff body, left end lid and right-hand member lid all include hollow lid, be provided with atomizing gas inlet, compressed air import, signal line import, power cord import, spraying medium import on the lateral wall of lid respectively, atomizing gas import and atomizing air chamber intercommunication, compressed air import and compressed air chamber intercommunication, signal line import and second threading die cavity intercommunication, power cord import and first threading die cavity intercommunication.

Optionally, a reinforcing groove is arranged on the wall of the outer pipe.

The application still provides a spray bar system, it includes main frame, cable suspension portion, sprays the case and as above spray bar subassembly, the spray bar hangs on the main frame through cable suspension portion, it includes the box body to spray the case, the box body is installed on the main frame, one side of spray bar is kept away from to the box mouth orientation of box body, be provided with the pilot hole with the shower nozzle one-to-one on spraying the box bottom of case, the pilot hole is arranged in to the shower nozzle on the spray bar, the spray bar laminating is on spraying the box bottom of case.

Optionally, the hanging part comprises a lifting cylinder, a first slide rail, a mounting groove, a compression spring, a connecting rod and a slide block, the fixed end of the lifting cylinder is fixed on the main frame, the first slide rail comprises a square pipe, a slide way is arranged on the lower pipe wall of the square pipe, the upper pipe wall of the square pipe is arranged on the lifting end of the lifting cylinder, the lower pipe wall is arranged opposite to the lower pipe wall, the slide block is arranged in the square pipe, and slides along the length direction of the square tube, the first end of the connecting rod passes through the slideway to be connected with the sliding block, the second end of the connecting rod is connected with the mounting groove, the spray rod is mounted in the mounting groove, the first end of the compression spring is fixed on the upper pipe wall, compression spring's second end is used for with the slider butt, square pipe length direction's both ends all are provided with the stopper that prevents that the slider from breaking away from square pipe, it fills up to have laid between the box bottom and the downside.

Optionally, the spraying device also comprises a chip cleaner and a sieve plate for placing the piece to be sprayed, wherein the chip cleaner comprises a driving motor, a coupler, a spiral rotor and a spiral groove, the two opposite sides of the sieve plate are respectively extended with a fixed plate, the sieve plate is arranged on the notch of the spiral groove through the fixed plate, the spiral groove is arranged below the box opening of the spray box, used for containing spraying medium, a discharge port is arranged at the bottom of the spiral groove, the edge of the box opening close to the discharge port is turned outwards to form a turned edge, the part of the groove opening of the spiral groove protruding out of the spraying box is hermetically provided with a cover plate, the cover plate is attached with the flanging, the discharging port is provided with a filter, the spiral rotor is installed in the spiral groove, the driving motor drives the spiral rotor to rotate through the coupler, and the distance between the groove bottom of the spiral groove and the spraying box is gradually increased along the direction close to the discharging direction.

Optionally, the lifting frame further comprises an auxiliary frame and at least two first angle irons, a plurality of lifting lugs are arranged on the auxiliary frame in the circumferential direction, each lifting lug is provided with a through hole, a plurality of studs corresponding to the lifting lugs one to one are welded on the main frame, and the studs penetrate through the through holes and are in threaded connection with nuts; at least two first angle irons are welded on the subframe in parallel, the opening of each first angle iron faces the subframe, two rows of supporting plates are arranged on the bottom of the spiral groove, each row of supporting plates comprises a plurality of supporting plates, a second angle iron is arranged on each supporting plate, and the second angle iron is arranged on the first angle iron in a sliding buckling mode.

Optionally, still include a plurality of covers that induced drafts, all be fixed with the curb plate on the relative both sides of case that sprays, be provided with a plurality of couples on the curb plate, the cover that induced drafts has seted up the installing port on the lateral wall of curb plate, the cover that induced drafts is hung through the edge of installing port and is established on the couple, induced draft cover is last to be provided with the closing plate, be provided with the seal groove on the closing plate, install the sealing strip between seal groove and the curb plate.

The application provides a spray bar subassembly and spray bar system is through setting the spray bar to outer tube and intermediate pipe, and the intermediate pipe becomes different regions with the inside interval of outer tube, and shower nozzle and cylinder are installed on the outer tube, and the shower nozzle need not respectively with each tube coupling, the connection setting of reducible pipeline, simplifies the wiring flow, reduces occupation space, simple structure moreover, and is with low costs.

Drawings

Fig. 1 is a schematic structural view of the spray bar assembly of the present application.

Fig. 2 is a perspective view of the spray bar of the present application.

Fig. 3 is a schematic structural view of the left end cap of the present application.

Fig. 4 is a schematic structural view of the spray bar system of the present application.

Fig. 5 is a schematic structural view of the hanger of the present application.

Fig. 6 is a top view of the spray box of the present application assembled with an air scoop.

Fig. 7 is a front view of the chip ejector of the present application.

Fig. 8 is a top view of the chip ejector of the present application.

Fig. 9 is a schematic view of the installation of the main frame and the sub-frame of the present application.

Detailed Description

The technical solutions of the present application are described in detail below with reference to the accompanying drawings and specific embodiments. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Fig. 1 shows a schematic structural view of the spray bar assembly of the present application, and fig. 2 shows a perspective view of the spray bar of the present application. As shown in fig. 1-2, the present application provides a spray bar assembly including at least one spray head 112, a spray bar 1, and air cylinders 113 in one-to-one correspondence with the spray head 112.

As shown in fig. 2, the number of the first mounting holes 114 is multiple, the multiple first mounting holes 114 are uniformly arranged along the extending direction of the outer tube 101, and the first mounting holes 114 correspond to the second mounting holes 115 one to one. In the present embodiment, the number of the heads 112 is 5 to 25. The aperture of the nozzle 112 is 0.05-5 mm.

The spray bar 1 comprises an outer pipe 101 and an intermediate pipe 106 for conveying a spraying medium, wherein the intermediate pipe 106 is nested in the outer pipe 101 and divides the interior of the outer pipe 101 into a first threading cavity 102, a second threading cavity 103, a compressed air cavity 105 and an atomizing air cavity 104.

The first threading cavity 102 is used for laying power cords, the second threading cavity 103 is used for laying signal cords, and the outer tube 101 is provided with first mounting holes 114 corresponding to the nozzles 112 one by one and second mounting holes 115 corresponding to the nozzles 112 one by one.

Spray head 112 is mounted in first mounting hole 114 and air cylinder 113 is mounted in second mounting hole 115 and connected to spray head 112 through compressed air chamber 105.

The compressed air chamber 105 supplies air to the cylinder 113 to control the operation of the cylinder 113. The cylinder 113 controls the opening and closing of the spray head 112, the atomizing air cavity 104 supplies atomizing air to the spray head 112, the middle pipe 106 is provided with a liquid outlet, and the liquid outlet supplies spraying medium to the spray head 112.

When the spray rod assembly works, a power line is laid in the first threading cavity 102, a signal line is laid in the second threading cavity 103, the spray head 112 is installed in the first installation hole 114, and the air cylinder 113 is installed in the second installation hole 115.

The application provides a spray bar subassembly is through setting the spray bar to outer tube and intermediate pipe, and the intermediate pipe becomes different regions with the inside interval of outer tube, and shower nozzle and cylinder are installed on the outer tube, and the shower nozzle need not respectively with each tube coupling, has reduced the connection setting of pipeline, simplifies the wiring flow, reduces occupation space, simple structure moreover, and is with low costs.

Utilize the spray bar subassembly that this application provided can reduce shower nozzle 90%'s connecting line to increase shower nozzle operational reliability 90%.

Further, the spray bar further comprises: and an inner pipe 107, wherein the inner pipe 107 is fit and mounted on the inner pipe wall of the intermediate pipe 106. The liquid outlet penetrates through the middle pipe 106 and the inner pipe 107, a heating cavity is formed between the middle pipe 106 and the inner pipe 107, and heat conducting oil is filled in the heating cavity.

The inner tube 107 is used for conveying spraying media, a heating rod 108 and a temperature measuring element 109 for measuring the temperature of heat conducting oil are further arranged in the heating cavity, the heating rod 108 is used for heating the heat conducting oil, and the temperature measuring element 109 and the heating rod 108 are both connected with a power line and a signal line.

Through setting up inner tube 107, the built-in conduction oil of heating die cavity to heat through heating rod 108, in order to guarantee the temperature of spraying medium, thereby guarantee its mobility, so that carry out the spraying better.

Further, the outer tube 101 is a rectangular tube, and the lower end surface of the middle tube 106 facing the first mounting hole 114 is parallel to the lower side wall of the rectangular tube.

The lower end surface extends out of the first extension plate and the second extension plate, and the first extension plate and the second extension plate are both vertically connected with the lower side pipe wall.

The first extension plate encloses an atomizing air chamber 104 with the intermediate tube 106 and the outer tube 101, and the second extension plate encloses a compressed air chamber with the intermediate tube 106 and the outer tube 101.

The first and second extension plates enclose an installation cavity with the intermediate tube 106 and the outer tube 101, and the installation cavity is located between the atomizing air cavity 104 and the compressed air cavity 105.

Spray head 112 is positioned within the mounting cavity and extends out through first mounting hole 114. The nozzle 112 is attached to the first extension plate, the second extension plate and the lower pipe wall.

The first extending plate is provided with an air outlet, the air outlet is communicated with an air inlet of the nozzle 112, and the atomizing air cavity 104 supplies atomizing air into the nozzle 112 through the air outlet.

Through setting up the installation cavity, not only can reduce the dead weight of spray bar 1, shower nozzle 112 laminates with atomizing air chamber 104, compressed air chamber 105 and intermediate pipe 106 respectively moreover, can carry out the transport of liquid better.

When the air outlet hole is machined, the pipe wall of the outer pipe 101 and the first extending plate can be drilled through together, and then the drilled hole in the outer pipe 101 is plugged through a bolt.

In one embodiment of the present application, the outer tube 101 includes a tube body, a left end cap and a right end cap, and the left end cap and the right end cap block both ends of the tube body.

The left end cover and the right end cover both comprise hollow cover bodies, and an atomizing gas inlet 1104, a compressed air inlet 1105, a signal line inlet 1102, a power line inlet 1101 and a spraying medium inlet 1103 are respectively arranged on the side walls of the cover bodies.

The atomizing gas inlet 1104 is communicated with the atomizing air cavity 104, the compressed air inlet 1105 is communicated with the compressed air cavity 105, the signal wire inlet 1102 is communicated with the second threading cavity 103, and the power wire inlet 1101 is communicated with the first threading cavity 102.

Through setting outer tube 101 to body, left end lid and right-hand member lid, can make things convenient for the dismouting of outer tube 101, be convenient for maintenance and washing.

During processing, firstly, a specific die is manufactured according to the section structure of the spray rod 1 to produce an aluminum profile; then, according to the structure of the aluminum profile and the structure of the spray head, the structure of the spray head is optimized again and matched with the aluminum profile, meanwhile, the aluminum profile is processed as required, and each cavity of the aluminum profile is connected with a channel corresponding to the spray head; the processing end cover is matched and sealed with the end face of the cavity of the aluminum profile, and spraying media and cables are distributed to different cavities of the aluminum profile from one end; and each spray head is installed, and the corresponding spray box is designed to be matched with the bottom surface of the aluminum profile, so that the spray rod and the spray box are sealed.

In this embodiment, both the heating rod 108 and the temperature measuring element 109 can be installed on the left end cover, and the temperature measuring element 109 measures the oil temperature of the heat transfer oil and controls the heating rod 108 to operate according to the oil temperature.

As shown in fig. 1, the outer tube 101 has reinforcing grooves 111 formed on the wall thereof for increasing strength. In one embodiment of the present application, the spray bar 1 may be integrally formed. In fig. 2, the lower pipe wall of the installation cavity is also provided with a reinforcing groove.

As shown in fig. 1, the outer tube 101 is a square tube, the thickness of both sides of the length direction of the two side tube walls perpendicular to the lower tube wall is greater than the thickness of the middle position, and the protruding portions are disposed on both sides of the length direction of the upper tube wall parallel to the lower tube wall to further increase the strength.

As shown in fig. 4, the present application also provides a spray bar system comprising a main frame 10, a hanger 2, a spray box 3 and a spray bar assembly as described above.

As shown in fig. 5-6, the spray bar 1 is hung on the main frame 10 through the hanging part 2, the spray box 3 is installed on the main frame 10, the spray box 3 comprises a box body, the box opening of the box body faces to one side far away from the spray bar 1, the box bottom of the spray box 3 is provided with assembly holes 301 corresponding to the spray heads 112 one by one, the spray heads 112 on the spray bar 1 are arranged in the assembly holes 301, the lower side surface of the spray bar 1 is a plane, the hanging part 2 provides a downward pressure, and the lower side surface is pressed and covered on the box bottom of the spray box 3.

As shown in fig. 6, there are at least two rows of the assembly holes 301, correspondingly, there are at least two spray bars 1, when one of them is failed, the other spray bar can be used for spraying, and the failed spray bar 1 can be repaired, thereby realizing on-line maintenance.

When the spray rod system works, a piece to be sprayed is positioned below the box opening, and spraying is carried out by using the spray head 112.

The application provides a spray bar system is through setting the spray bar to outer tube and intervalve, and the intervalve becomes different regions with the inside interval of outer tube, and shower nozzle and cylinder are installed on the outer tube, and the shower nozzle need not respectively with each tube coupling, and the connection of reducible pipeline sets up, simplifies the wiring flow, reduces occupation space, simple structure moreover, and is with low costs.

In one embodiment, as shown in fig. 5, the hanging part 2 includes a lifting cylinder 201, a first slide rail 202, a mounting groove 204, a compression spring 206, a connecting rod and a slider 203.

The stiff end of lift cylinder 201 is fixed on main frame 10, and first slide rail 202 has seted up the slide including square pipe on the lower pipe wall of square pipe, and the last pipe wall of square pipe is installed at the lift of lift cylinder 201 and is served, and lower pipe wall sets up with lower pipe wall relatively.

Slider 203 installs in square intraductal, and slides along the length direction of square pipe, and the first end of connecting rod passes the slide and is connected with slider 203, and the second end and the mounting groove 204 of connecting rod are connected, and spray bar 1 accessible screw installation is in mounting groove 204.

The first end of compression spring 206 is fixed in the upper tube wall, and the second end of compression spring 206 is used for with slider 203 butt, can reduce slider 203's the range that moves up and down in the lift process, can make spray arm 1 go up and down more gently.

The two ends of the square pipe in the length direction are provided with limiting blocks 205 for preventing the sliding block 203 from being separated from the square pipe. As shown in fig. 6, a gasket 116 is laid between the bottom and the underside of the cassette to increase sealing performance.

Further, the spray bar system also comprises a chip cleaner 7 and a sieve plate 6 for placing the piece to be sprayed.

As shown in fig. 7 to 8, the chip ejector 7 includes a drive motor 703, a coupling 704, a screw rotor 702, and a spiral groove 701.

The two opposite sides of the sieve plate 6 are respectively extended with a fixed plate, and the sieve plate 6 is arranged on the notch of the spiral groove 701 through the fixed plates.

The spiral groove 701 is installed below a box opening of the spraying box 3 and used for containing spraying media, a discharge opening is formed in the bottom of the spiral groove 701, and the edge, close to the discharge opening, of the box opening is turned outwards to form a flanging.

The part of the groove opening of the spiral groove 701 protruding out of the spray box 3 is provided with a cover plate 707 in a sealing mode, the cover plate 707 is attached to the flanging, and the part of the spiral groove 701 protruding out of the spray box 3 is sealed by the cover plate 707 to prevent the spraying medium from leaking out.

The discharge port is provided with a filter 9, and the filter 9 can be a drawer type filter.

The spiral rotor 702 is arranged in the spiral groove 701, the driving motor 703 drives the spiral rotor 702 to rotate through the coupler 704, and the distance between the bottom of the spiral groove 701 and the spraying box 3 is gradually increased along the direction close to the discharging direction.

The left side and the right side of the sieve plate 6 are provided with conveyors, and the left side conveyor conveys the parts to be sprayed to the sieve plate, and the parts are conveyed away by the right side conveyor after the spraying is finished. The spraying medium sprayed by the spray head 112 falls into the spiral groove 701 through the sieve plate 6, and flows into the filter 9 through the discharge port under the action of gravity and the spiral rotor for recycling. The rotation of the helical rotor 702 also avoids solidification of the spray media.

By arranging the chip cleaner 7, the spraying medium can be recycled, the spraying cost can be saved, and the resources are saved.

Further, as shown in fig. 9, the spray rod system further includes a sub-frame 8 and at least two first angle irons 801, a plurality of lifting lugs 802 are disposed on the sub-frame 8 in the circumferential direction, and each lifting lug 802 is provided with a through hole.

A plurality of studs 804 which correspond to the lifting lugs one to one are welded on the main frame 10, and the studs 804 penetrate through the through holes and are in threaded connection with nuts 803; at least two first angle irons 801 are welded on the subframe 8 in parallel, and each first angle iron 801 is opened toward the subframe 8.

Two rows of support plates are arranged on the bottom of the spiral groove 701, each row of support plates comprises a plurality of support plates 705, each support plate 705 is provided with a second angle iron 706, and the second angle iron 706 is slidably buckled on the first angle iron 801.

By arranging the subframe 8, the first angle iron 801 and the second angle iron 706, the chip remover 7 can be moved along the length direction of the subframe, and the position of the chip remover 7 can be adjusted so as to better recover the spraying medium.

Further, as shown in fig. 4, the spray rod system further includes a plurality of air suction covers 4, side plates 5 are fixed on two opposite sides of the spray box 3, a plurality of hooks are arranged on the side plates 5, a mounting opening is formed in the side wall, facing the side plates, of each air suction cover 4, the air suction covers 4 are hung on the hooks through the edges of the mounting openings, sealing plates 401 are arranged on the air suction covers 4, sealing grooves are formed in the sealing plates 401, and sealing strips are installed between the sealing grooves and the side plates 5.

Through setting up the cover 4 and curb plate 5 of induced drafting, on the one hand, convenient assembly, on the other hand can take away the spraying medium, avoids leaking, the environmental protection.

Further, in order to increase the strength, both ends of the side plate 5 in the length direction are turned over towards the direction of the spraying box 3 to form turning plates.

In one embodiment, a plurality of hanging plates are vertically arranged on the side plate 5, and the hanging plates are provided with notches which form hooks with the side plate 5.

The technical solutions of the present application are described in detail with reference to specific embodiments, which are used to help understand the ideas of the present application. The derivation and modification made by the person skilled in the art on the basis of the specific embodiment of the present application also belong to the protection scope of the present application.

Claims

1. A spray rod assembly is characterized by comprising a spray head, a spray rod and a cylinder, wherein the spray rod comprises an outer pipe and a middle pipe used for conveying a spraying medium, the middle pipe is nested in the outer pipe, and the interior of the outer tube is divided into a first threading cavity, a second threading cavity, a compressed air cavity and an atomized air cavity, the first threading cavity is used for laying a power line, the second threading cavity is used for laying a signal line, the outer pipe is provided with a first mounting hole and a second mounting hole, the spray head is mounted in the first mounting hole, the air cylinder is mounted in the second mounting hole and connected with the spray head through a compressed air cavity, the compressed air cavity supplies air to the air cylinder, the device comprises a control cylinder, a spray head, an atomizing air cavity, a middle pipe and a spray head, wherein the control cylinder works, the air cylinder controls the spray head to open and close, the atomizing air cavity supplies atomizing air to the spray head, the middle pipe is provided with a liquid outlet, and the liquid outlet supplies spraying media to the spray head.

2. The spray bar assembly of claim 1, wherein said spray bar further comprises: the inner tube, the inner tube laminating is installed on the inner tube wall of intermediate tube, the liquid outlet runs through intermediate tube and inner tube, form the heating die cavity between intermediate tube and the inner tube, the heating die cavity holds the conduction oil, the spraying medium is carried to the inner tube, still be provided with the heating rod in the heating die cavity and measure the temperature element of conduction oil temperature, the heating rod heating the conduction oil, temperature element and heating rod all are connected with power cord and signal line.

3. The spray bar assembly according to claim 2, wherein the outer tube is a rectangular tube, the lower end surface of the middle tube facing the first mounting hole is parallel to the lower side wall of the rectangular tube, the lower end surface extends out of a first extension plate and a second extension plate, the first extension plate and the second extension plate are both vertically connected to the lower side wall, the first extension plate, the middle tube and the outer tube define an atomizing air cavity, the second extension plate, the middle tube and the outer tube define a compressed air cavity, the first extension plate and the second extension plate, the middle tube and the outer tube define a mounting cavity, the side wall of the spray head is respectively attached to the lower side walls of the first extension plate, the second extension plate and the middle tube, the first extension plate is provided with air outlets, the air outlets are communicated with air inlets of the spray head, and the atomizing air cavity supplies atomizing air to the spray head through the air outlets.

4. The spray bar assembly according to any one of claims 1-3, wherein the outer tube comprises a tube body, a left end cap and a right end cap, the left end cap and the right end cap block two ends of the tube body, the left end cap and the right end cap each comprise a hollow cap body, an atomizing gas inlet, a compressed air inlet, a signal line inlet, a power line inlet and a spraying medium inlet are respectively arranged on the side wall of the cap body, the atomizing gas inlet is communicated with the atomizing air cavity, the compressed air inlet is communicated with the compressed air cavity, the signal line inlet is communicated with the second threading cavity, and the power line inlet is communicated with the first threading cavity.

5. A spray bar assembly according to any one of claims 1 to 3, wherein the wall of the outer tube is provided with reinforcing slots.

6. The spray rod system is characterized by comprising a main frame, a hanging part, a spray box and the spray rod assembly according to any one of claims 1 to 5, wherein the spray rod is hung on the main frame through the hanging part, the spray box comprises a box body, the box body is installed on the main frame, a box opening of the box body faces to one side far away from the spray rod, assembly holes corresponding to the spray heads in a one-to-one mode are formed in the box bottom of the spray box, the spray heads on the spray rod are placed in the assembly holes, and the spray rod is attached to the box bottom of the spray box.

7. The spray bar system according to claim 6, wherein the hanging part comprises a lifting cylinder, a first slide rail, a mounting groove, a compression spring, a connecting rod and a slider, the fixed end of the lifting cylinder is fixed on the main frame, the first slide rail comprises a square pipe, a slide way is arranged on the lower pipe wall of the square pipe, the upper pipe wall of the square pipe is mounted on the lifting end of the lifting cylinder, the lower pipe wall and the lower pipe wall are arranged oppositely, the slider is mounted in the square pipe and slides along the length direction of the square pipe, the first end of the connecting rod passes through the slide way to be connected with the slider, the second end of the connecting rod is connected with the mounting groove, the spray bar is mounted in the mounting groove, the first end of the compression spring is fixed on the upper pipe wall, the second end of the compression spring is used for abutting against the slider, and two ends of the square pipe in the length direction are provided with limiting blocks for preventing the slider from separating from the square pipe, and a sealing gasket is laid between the box bottom and the lower side surface.

8. The spray bar system of claim 7 further comprising a chip ejector and a screen plate for receiving a piece to be sprayed, the chip cleaner comprises a driving motor, a shaft coupling, a spiral rotor and a spiral groove, fixing plates respectively extend from two opposite sides of the sieve plate, the sieve plate is arranged on the notch of the spiral groove through the fixing plate, the spiral groove is arranged below the box opening of the spraying box, used for containing spraying medium, a discharge port is arranged at the bottom of the spiral groove, the edge of the box opening close to the discharge port is turned outwards to form a turned edge, the part of the groove opening of the spiral groove protruding out of the spraying box is hermetically provided with a cover plate, the cover plate is attached with the flanging, the discharging port is provided with a filter, the spiral rotor is installed in the spiral groove, the driving motor drives the spiral rotor to rotate through the coupler, and the distance between the groove bottom of the spiral groove and the spraying box is gradually increased along the direction close to the discharging direction.

9. The spray bar system of claim 8, further comprising a sub-frame and at least two first angle irons, wherein a plurality of lifting lugs are arranged on the sub-frame in the circumferential direction, each lifting lug is provided with a through hole, a plurality of studs corresponding to the lifting lugs one by one are welded on the main frame, and the studs penetrate through the through holes and are in threaded connection with nuts; at least two first angle irons are welded on the subframe in parallel, the opening of each first angle iron faces the subframe, two rows of supporting plates are arranged on the bottom of the spiral groove, each row of supporting plates comprises a plurality of supporting plates, a second angle iron is arranged on each supporting plate, and the second angle iron is arranged on the first angle iron in a sliding buckling mode.

10. The spray bar system of claim 9, further comprising a plurality of air suction covers, wherein side plates are fixed on two opposite sides of the spray box, a plurality of hooks are arranged on the side plates, mounting openings are formed in the side walls, facing the side plates, of the air suction covers, the air suction covers are hung on the hooks through the edges of the mounting openings, sealing plates are arranged on the air suction covers, sealing grooves are arranged on the sealing plates, and sealing strips are arranged between the sealing grooves and the side plates.