Coating spraying machine for grease substances

Abstract

The invention discloses a coating spraying machine for grease substances. The coating spraying machine comprises a main machine frame, and a feeding trolley is arranged on one side of the main machine frame; the main machine frame is connected with the lifting module, the lifting module is connected with the spraying machine head, and the spraying machine head is used for spraying spraying liquid. The spraying machine head is provided with a shielding device, and the shielding device is used for collecting redundant spraying liquid sprayed by the spraying machine head; the main rack is provided with a control electric cabinet, the control electric cabinet is provided with a recovery device, and the recovery device is used for sucking the spraying liquid collected by the shielding device and conveying the spraying liquid into the feeding trolley; and the feeding trolley is provided with an air extractor, and the air extractor is used for extracting atomized spraying liquid in the spraying machine head. According to the coating spraying machine for the grease substances, the shielding device and the extrusion device are arranged in the spraying machine head, redundant spraying liquid can be collected, then the collected spraying liquid is stored in a centralized mode through the recovery device, secondary utilization of the spraying liquid is facilitated, and therefore the using amount of the spraying liquid is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, and in particular to a coating sprayer for grease substances. Background Art

[0002] A sprayer is a special coating equipment that uses spraying technology. The principle is to control the airflow to instantly push the air distribution reversing device to reverse, so that the piston of the pneumatic motor can make a stable and continuous reciprocating motion. The inhaled paint is pressurized and transported to the spray gun of the sprayer through a high-pressure hose. The spray gun instantly atomizes the paint and releases it to the surface of the object to be coated. The sprayer is mainly composed of a feeding device, a spray gun, and an atomization source. It is generally used for spraying paint and is suitable for leather handbags, gift packaging, furniture, footwear, automobile manufacturing and other industries. In the food industry, the surface of some foods such as steamed buns and bread needs to be coated with grease to form a grease film (i.e., coating). If the sprayer is used in food spraying, it can replace manual coating.

[0003] During the spraying process of a commonly used spray machine, the spray gun is in a normally open state, which easily wastes a large amount of spray liquid. In addition, the conveying device for transporting the object to be sprayed needs to be customized according to the shape characteristics of the object to be sprayed, so that the object to be sprayed is transported to the spray gun through the conveyor belt in the conveying device, and then the spray gun sprays the object to be sprayed. However, the spray liquid spreads outward in a fan shape. When spraying food, the conveyor belt is prone to adhere to a large amount of oily spray liquid, which makes the conveyor belt difficult to clean and further wastes the spray liquid. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a coating sprayer for grease substances.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a coating sprayer for oily substances, comprising: a main frame, a feeding trolley is arranged on one side of the main frame; the main frame is connected to a lifting module, the lifting module is connected to a spray head, and the spray head is used to spray a spray liquid; the spray head is provided with a shielding device, and the shielding device is used to collect excess spray liquid sprayed from the spray head; the main frame is provided with a control cabinet, and the control cabinet is provided with a recovery device, and the recovery device is used to absorb the spray liquid collected by the shielding device and transport it to the feeding trolley; the feeding trolley is provided with an exhaust device, and the exhaust device extracts the atomized spray liquid in the spray head.

[0006] As a further description of the above technical solution: the spray head includes a head frame, and the head frame is connected to an automatic spray gun.

[0007] As a further description of the above technical solution: the shielding device includes a rodless cylinder, the rodless cylinder is fixed with a connecting plate by bolts, the connecting plate is fixed with a material receiving trough by bolts, the material receiving trough is provided with a first liquid extraction joint, and the material receiving trough is used to store the spray liquid.

[0008] As a further description of the above technical solution: a base is arranged in the material receiving trough, a cover plate is fixed to the base by bolts, a receiving cavity is arranged between the base and the cover plate, absorbent cotton is arranged in the receiving cavity, and the absorbent cotton is used to absorb the spray liquid.

[0009] As a further description of the above technical solution: the cover plate and the absorbent cotton are both provided with spray holes for use with the spray gun, and the spray liquid sprayed from the spray gun passes through the spray holes and is sprayed onto the surface of the object to be sprayed.

[0010] As a further description of the above technical solution: the head frame is connected to an extrusion device, and the extrusion device is used to squeeze out the spray liquid absorbed by the absorbent cotton.

[0011] As a further description of the above technical solution: the recovery device includes a vacuum pump, the liquid inlet of the vacuum pump is connected to the first liquid extraction joint through a pipeline, the liquid outlet of the vacuum pump is connected to a vacuum bottle through a pipeline, and the spray liquid in the receiving trough is transported to the vacuum bottle through the vacuum pump.

[0012] As a further description of the above technical solution: the output end of the vacuum bottle is connected to a peristaltic pump through a pipeline, and the liquid outlet of the peristaltic pump is connected to the feeding trolley through a pipeline.

[0013] As a further description of the above technical solution: the automatic spray gun is provided with a sensor, and the sensor is used to generate a control signal when the object to be sprayed enters the spraying area, and the automatic spray gun starts the spraying program based on the control signal to spray the object to be sprayed.

[0014] As a further description of the above technical solution: the exhaust device is an axial flow fan, the feeding trolley is provided with a top groove, a filter element is arranged in the top groove, the top groove is connected to the spray head through a pipeline, and the air inlet end of the axial flow fan is connected to the top groove through an air duct.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] 1. The coating sprayer for grease-like substances is provided with a shielding device and an extruding device in the sprayer head to collect the excess spray liquid, and then the collected spray liquid is centrally stored by the recovery device, which is convenient for the secondary utilization of the spray liquid, thereby greatly saving the amount of the spray liquid.

[0017] 2. Setting the spray hole can make it difficult for the spray liquid to be sprayed onto the conveyor belt surface of the external conveyor, thereby keeping the conveyor belt surface clean.

[0018] 3. The size of the spray holes on the cover plate and the absorbent cotton is designed according to the width of the object to be sprayed. There is no restriction on the type and shape of the external conveyor belt, which improves the adaptability of the equipment.

[0019] 4. The closed structure of the spray head can prevent the exhaust gas in the spray head from being directly discharged to the outside and causing environmental pollution.

[0020] 5. The closed structure of the spray head seals the exhaust gas inside, making it easy for the exhaust device to immediately extract and purify the exhaust gas. This is environmentally friendly and can also reduce the difficulty of cleaning the internal structure of the spray head.

[0021] 6. The filter element, axial flow fan, water tank, raw material tank and waste liquid barrel are integrated in the mobile feeding trolley. During daily maintenance, the mobile feeding trolley can be pushed to the operation room to facilitate the replacement of the filter element, the filling of raw materials in the raw material tank, the discharge of waste liquid in the waste liquid barrel, the discharge of waste water in the water tank and the filling of clean water, which greatly improves the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of a coating spraying machine for grease substances proposed by the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the internal structure of the spray head;

[0024] Figure 3 for Figure 2 Left side view of the center headstock;

[0025] Figure 4 for Figure 3 Schematic diagram of the automatic spray gun;

[0026] Figure 5 for Figure 2 Schematic diagram of the middle occlusion device;

[0027] Figure 6 for Figure 2 Schematic diagram of the extrusion device;

[0028] Figure 7 It is a schematic diagram of the squeezing device squeezing the absorbent cotton;

[0029] Figure 8 for Figure 1 Schematic diagram of the internal structure of the control cabinet;

[0030] Fig. 9 for Figure 8Schematic diagram of the recovery device;

[0031] Fig.10 for Figure 1 The enlarged view of point A in the middle;

[0032] Fig.11 for Figure 1 Schematic diagram of the internal structure of the feeding trolley.

[0033] Legend:

[0034] 1. Main frame; 2. Spraying machine head; 21. Machine head frame; 22. Automatic spray gun; 23. Shielding device; 231. Mounting plate; 232. Rodless cylinder; 233. Connecting plate; 234. Receiving trough; 235. Cover plate; 236. Water-absorbing cotton; 237. Base; 238. First liquid extraction joint; 24. Extrusion device; 241. Extrusion block; 242. Liquid extraction chamber; 243. Connecting piece; 244 , the second liquid extraction joint; 245, lifting cylinder; 3, lifting module; 4, control cabinet; 41, cabinet; 42, industrial computer; 43, recovery device; 431, vertical plate; 432, clamp valve; 433, vacuum pump; 434, vacuum bottle; 435, peristaltic pump; 5, feeding trolley; 51, frame; 52, filter element; 53, axial flow fan; 54, water tank; 55, raw material tank; 56, waste liquid barrel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Reference Figure 1 , Fig.11 An embodiment of the present invention is a coating sprayer for oily substances, comprising: a main frame 1, a feeding trolley 5 is arranged on one side of the main frame 1, the feeding trolley 5 is provided with a frame 51, a wall panel is arranged around the frame 51, one side of which is provided with a movable door, a raw material tank 55 and a waste liquid barrel 56 are arranged in the feeding trolley 5, and the raw material tank 55 contains spraying liquid. When spraying the surface of food, the object to be sprayed includes but is not limited to steamed buns and bread, and the spraying liquid is edible oil, which is sprayed on the surface of the object to be sprayed to form a layer of oil film (i.e., coating).

[0037] Among them, refer to Figure 1-Figure 4The main frame 1 is connected to the lifting module 3 by bolts, and the lifting module 3 is connected to the spray head 2 by bolts. The spray head 2 includes a head frame 21, and the head frame 21 is closed by setting a wall panel around it, so that the spray head 2 forms a closed structure, and the head frame 21 is connected to the automatic spray gun 22, and the automatic spray gun 22 is connected to the raw material tank 55 by a pipeline, and the pipeline can be disassembled. The automatic spray gun 22 in the spray head 2 absorbs the spray liquid in the raw material tank 55 for spraying on the surface of the object to be sprayed, and a part of the spray liquid sprayed by the automatic spray gun 22 will be atomized into gas (i.e., exhaust gas), and the exhaust gas diffuses outward in the spray head 2. The closed structure of the spray head 2 can avoid the environmental pollution caused by the exhaust gas in the spray head 2 being directly discharged to the outside.

[0038] Reference Figure 2-Figure 3 The spray head 2 is provided with a shielding device 23, and the shielding device 23 is used to collect the excess spraying liquid sprayed by the spray head 2.

[0039] Specifically, refer to Figure 5 The shielding device 23 includes a mounting plate 231, which is fixed to the head frame 21 by bolts, and the mounting plate 231 is connected to the rodless cylinder 232 by bolts. The rodless cylinder 232 is fixed with a connecting plate 233 by bolts, and the connecting plate 233 is fixed with a material receiving groove 234 by bolts. The material receiving groove 234 is used to store the spray liquid. The material receiving groove 234 is provided with a first liquid extraction joint 238. The base 237 is fixed in the material receiving groove 234 by bolts. The bottom of the material receiving groove 234 and the bottom of the base 237 are provided with through holes, and the base 237 is connected by A cover plate 235 is fixed by bolts, and a receiving cavity is set between the base 237 and the cover plate 235. Water-absorbing cotton 236 is set in the receiving cavity. The water-absorbing cotton 236 is used to absorb the spray liquid, wherein the horizontal cross-sectional area of ​​the receiving cavity is larger than the horizontal cross-sectional area of ​​the through hole, so that the water-absorbing cotton 236 can be stably placed in the receiving cavity and is not easy to fall from the through hole. The cover plate 235 and the water-absorbing cotton 236 are both provided with a spray hole for use with the automatic spray gun 22. The spray hole is smaller than the through hole, so that the spray liquid sprayed by the automatic spray gun 22 can pass through the spray hole and spray onto the surface of the object to be sprayed.

[0040] In this embodiment, since the liquid sprayed by the automatic spray gun 22 is in a fan-shaped state, in order to prevent the spraying liquid from being sprayed onto the surface of the external conveyor belt, the size of the spray holes on the cover plate 235 and the absorbent cotton 236 can be designed in combination with the width of the object to be sprayed, so that the spraying liquid reaches the surface of the object to be sprayed through the spray holes, making it difficult for the spraying liquid to be sprayed onto the conveyor belt, keeping the surface of the conveyor belt clean, and there are no restrictions on the type and shape of the external conveyor belt, thereby improving the adaptability of the equipment.

[0041] The automatic spray gun 22 is provided with a sensor, which is used to generate a control signal when the object to be sprayed enters the spraying area. The automatic spray gun 22 starts the spraying program based on the control signal to spray the object to be sprayed. Specifically, when the object to be sprayed is conveyed to the bottom of the spray head 2 via the external conveyor belt, the sensor identifies the object to be sprayed, and the automatic spray gun 22 absorbs the spray liquid in the raw material tank 55 and sprays the object to be sprayed. A part of the spray liquid blocked by the spray hole is blocked by the shielding cover plate 235 and flows into the material receiving trough 234, and the other part is absorbed by the absorbent cotton 236.

[0042] Reference Figure 2-Figure 3 , Figure 6 The head frame 21 is connected to the extrusion device 24, and the extrusion device 24 is used to squeeze out the spray liquid absorbed by the absorbent cotton 236. The extrusion device 24 includes a lifting cylinder 245, and the lifting cylinder 245 is fixed to the head frame 21 by bolts. The lifting cylinder 245 is fixed with a connecting piece 243 by bolts, and the connecting piece 243 is fixed with a liquid extraction bin 242 by bolts. The liquid extraction bin 242 is provided with a second liquid extraction joint 244, and the second liquid extraction joint 244 is connected to the pipeline. The top of the liquid extraction bin 242 is fixed with an extrusion block 241 by bolts, and the extrusion block 241 is slidably connected to the through hole at the bottom of the material receiving trough 234.

[0043] In this embodiment, refer to Figure 7 As the absorbent cotton 236 absorbs more and more liquid, it is necessary to discharge the spray liquid in the absorbent cotton 236 in time. At this time, the extrusion device 24 is used to squeeze out the liquid in the absorbent cotton 236, and the lifting cylinder 245 is turned on. The lifting cylinder 245 drives the connecting piece 243 to move upward, and the connecting piece 243 drives the liquid extraction bin 242 and the extrusion block 241 to move upward. The extrusion block 241 passes through the through hole at the bottom of the receiving trough 234 to squeeze the absorbent cotton 236. At the same time, there is suction at the second liquid extraction joint 244. The liquid squeezed out of the absorbent cotton 236 is sucked into the liquid extraction bin 242 under the action of negative pressure, and flows into the pipeline connected to the second liquid extraction joint 244.

[0044] Reference Figure 1 , Figure 8 The main frame 1 is provided with a control cabinet 4, and the control cabinet 4 includes a cabinet body 41. An industrial computer 42 is provided on the cabinet body 41. A control system is provided in the industrial computer 42. The control system can drive the automatic spray gun 22 to spray the object to be sprayed, and can also adjust the switch and the opening time of the automatic spray gun 22. The control cabinet 4 is provided with a recovery device 43, and the recovery device 43 is used to absorb the spray liquid collected by the shielding device 23 and transport it to the feeding trolley 5.

[0045] Specifically, refer to Fig. 9The recovery device 43 includes a vertical plate 431, which is fixedly installed in the cabinet 41. The vertical plate 431 is fixed with a vacuum pump 433 by bolts. The vacuum pump 433 is provided with multiple liquid inlets. One liquid inlet of the vacuum pump 433 is connected to the first liquid extraction joint 238 by a pipeline, and one liquid inlet is connected to the second liquid extraction joint 244 by a pipeline. The liquid outlet of the vacuum pump 433 is connected to a vacuum bottle 434 by a pipeline. The spraying liquid in the receiving trough 234 is transported to the vacuum bottle 434 by the vacuum pump 433, and the output end of the vacuum bottle 434 is connected to a peristaltic pump 435 by a pipeline, wherein the vacuum bottle 434 and the peristaltic pump 435 are both fixed to the vertical plate 431 by bolts, and the liquid outlet of the peristaltic pump 435 is connected to the waste liquid barrel 56 in the feeding trolley 5 by a pipeline.

[0046] In this embodiment, the vacuum pump 433 extracts the liquid in the receiving trough 234 and the liquid in the liquid extraction chamber 242 through the pipeline, and transports them to the vacuum bottle 434 for storage. When there is a lot of liquid in the vacuum bottle 434, the peristaltic pump 435 is started to pump the liquid in the vacuum bottle 434 into the waste liquid barrel 56, so that the excess spray liquid flowing into the receiving trough 234 and the spray liquid absorbed by the absorbent cotton 236 are collected in the waste liquid barrel 56. The spray liquid in the waste liquid barrel 56 can be taken out for secondary utilization, thereby greatly saving the amount of spray liquid.

[0047] It can be understood that there are two shielding devices 23 and four extrusion devices 24 in the spray head 2, and two spray holes are set in each shielding device 23. The four extrusion devices 24 correspond to one spray hole respectively. When one spray hole in the shielding device 23 is spraying, the absorbent cotton 236 corresponding to the other spray hole is squeezed by the extrusion block 241 and liquid is extracted; in order to make the structure in the equipment simpler, every two extrusion devices 24 share a vacuum pump 433 and a vacuum bottle 434. When one of the extrusion blocks 241 squeezes the absorbent cotton 236, the pipeline connected to the other extrusion device 24 needs to be closed, and the pipe can be clamped by a pipe clamping valve 432.

[0048] Reference Fig.11 The feeding trolley 5 is provided with an exhaust device, which can be an air pump, a centrifugal fan, a blower or other equipment that can transport gas. Preferably, the exhaust device is an axial flow fan 53, which is fixed to the frame 51 by bolts. When the axial flow fan 53 is turned on, the atomized spray liquid in the spray head 2 can be extracted.

[0049] Reference Figure 10-11The feeding trolley 5 is provided with a top groove, in which a filter element 52 is arranged, and the filter element 52 can be disassembled and replaced in the top groove. The filter element 52 can be a material with adsorption performance such as molecular sieve, biochar, ceramic material, etc., preferably activated carbon, which is a highly porous material with a large surface area, and therefore has a strong adsorption force, and can adsorb oil and odor in the exhaust gas (the spray liquid atomized in the spray head 2). The top groove is connected to the spray head 2 through a pipeline, and the air inlet end of the axial flow fan 53 is connected to the top groove through an air duct, and the air outlet end of the axial flow fan 53 is connected to a water tank 54 through the air duct, and the water tank 54 is arranged in the frame 51. After the exhaust gas in the spray head 2 is generated, the axial flow fan 53 can immediately extract the exhaust gas, and the exhaust gas is filtered by the activated carbon and then passed into the water tank 54, and finally purified in the water, which is environmentally friendly and can also reduce the difficulty of cleaning the internal structure of the spray head 2.

[0050] In addition, the filter element 52, axial flow fan 53, water tank 54, raw material tank 55 and waste liquid barrel 56 are integrated in the mobile feeding cart 5. During daily maintenance, the mobile feeding cart 5 can be pushed to the operation room to facilitate the replacement of the filter element 52, the filling of raw materials in the raw material tank 55, the discharge of waste liquid in the waste liquid barrel 56, the discharge of waste water in the water tank 54 and the filling of clean water, which greatly improves the convenience of operation.

[0051] Working principle: When the object to be sprayed is conveyed to the bottom of the spray head 2 via the external conveyor belt, the sensor identifies the object to be sprayed, and the automatic spray gun 22 absorbs the spray liquid in the raw material tank 55 and sprays the object to be sprayed. A part of the spray liquid blocked by the spray hole is blocked by the shielding cover 235 and flows into the receiving trough 234, and the other part is absorbed by the absorbent cotton 236. As the absorbent cotton 236 absorbs more and more liquid, it is necessary to discharge the spray liquid in the absorbent cotton 236 in time, open the lifting cylinder 245, and the lifting cylinder 245 drives the connecting piece 243 to move up, and the connecting piece 243 drives the liquid extraction bin 242 and the extrusion block 241 to move up. The extrusion block 241 passes through the through hole at the bottom of the material receiving trough 234 to squeeze the absorbent cotton 236. At the same time, there is suction at the second liquid extraction joint 244. The liquid squeezed out of the absorbent cotton 236 is sucked into the liquid extraction chamber 242 under the action of negative pressure, and flows into the pipeline connected to the second liquid extraction joint 244. The vacuum pump 433 is turned on, and the vacuum pump 433 extracts the liquid in the material receiving trough 234 and the liquid in the liquid extraction chamber 242 through the pipeline, and transports them to the vacuum bottle 434 for storage. When there is more liquid in the vacuum bottle 434, the peristaltic pump 435 is started to pump the liquid in the vacuum bottle 434 into the waste liquid barrel 56.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coating spraying machine for oily substances, Features: include: A main frame (1), a feeding trolley (5) is arranged on one side of the main frame (1); The main frame (1) is connected to a lifting module (3), the lifting module (3) is connected to a spray head (2), and the spray head (2) is used to spray a spray liquid; The spray head (2) is provided with a shielding device (23), and the shielding device (23) is used to collect excess spraying liquid sprayed by the spray head (2); The main frame (1) is provided with a control cabinet (4), and the control cabinet (4) is provided with a recovery device (43), and the recovery device (43) is used to absorb the spraying liquid collected by the shielding device (23) and transport it to the feeding trolley (5); The feeding trolley (5) is provided with an air extraction device, and the air extraction device extracts the atomized spraying liquid in the spraying machine head (2).

2. A coating spraying machine for grease substances according to claim 1, Features: The spray head (2) comprises a head frame (21), and the head frame (21) is connected to an automatic spray gun (22).

3. A coating spraying machine for grease substances according to claim 2, Features: The shielding device (23) comprises a rodless cylinder (232), the rodless cylinder (232) being fixed with a connecting plate (233) by means of bolts, the connecting plate (233) being fixed with a material receiving trough (234) by means of bolts, the material receiving trough (234) being provided with a first liquid extraction joint (238), and the material receiving trough (234) being used for storing the spraying liquid.

4. A coating spraying machine for grease substances according to claim 3, Features: A base (237) is arranged in the material receiving trough (234), and a cover plate (235) is fixed to the base (237) by bolts. An accommodating cavity is arranged between the base (237) and the cover plate (235), and absorbent cotton (236) is arranged in the accommodating cavity. The absorbent cotton (236) is used to absorb the spray liquid.

5. A coating spraying machine for grease substances according to claim 4, Features: The cover plate (235) and the absorbent cotton (236) are both provided with spray holes for use with the spray gun (22), and the spray liquid sprayed from the spray gun (22) passes through the spray holes and is sprayed onto the surface of the object to be sprayed.

6. A coating spraying machine for grease substances according to claim 4, Features: The head frame (21) is connected to an extrusion device (24), and the extrusion device (24) is used to squeeze out the spray liquid absorbed by the absorbent cotton (236).

7. A coating spraying machine for grease substances according to claim 6, Features: The recovery device (43) comprises a vacuum pump (433), the liquid inlet of the vacuum pump (433) is connected to the first liquid extraction joint (238) via a pipeline, the liquid outlet of the vacuum pump (433) is connected to a vacuum bottle (434) via a pipeline, and the spraying liquid in the receiving trough (234) is transported to the vacuum bottle (434) via the vacuum pump (433).

8. A coating spraying machine for oily substances according to claim 7, Features: The output end of the vacuum bottle (434) is connected to a peristaltic pump (435) via a pipeline, and the liquid outlet of the peristaltic pump (435) is connected to the feeding trolley (5) via a pipeline.

9. A coating spraying machine for oily substances according to claim 2, Features: The automatic spray gun (22) is provided with a sensor, and the sensor is used to generate a control signal when the object to be sprayed enters the spraying area. The automatic spray gun (22) starts a spraying program based on the control signal to spray the object to be sprayed.

10. A coating spraying machine for oily substances according to claim 1, Features: The air extraction device is an axial flow fan (53), the feeding trolley (5) is provided with a top groove, a filter element (52) is arranged in the top groove, the top groove is connected to the spray head (2) through a pipeline, and the air inlet end of the axial flow fan (53) is connected to the top groove through an air duct.

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