CN214615266U

CN214615266U - Spraying equipment

Info

Publication number: CN214615266U
Application number: CN202120411494.8U
Authority: CN
Inventors: 逯世杰; 闫礼强; 窦正伟
Original assignee: Guangdong Bozhilin Robot Co Ltd
Current assignee: Guangdong Bozhilin Robot Co Ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-11-05
Anticipated expiration: 2031-02-24

Abstract

The utility model provides a spraying equipment. The spray coating device includes: a power pump; a material conveying pipeline; the feeding end of the power pump is used for being connected with the hopper, and the discharging end of the power pump is connected with the material spraying part through a material conveying pipeline; the pressure blocking prevention device is arranged on the material conveying pipeline and is positioned between the power pump and the material spraying part so as to reduce the pressure blocking phenomenon when the material spraying part starts spraying. The technical scheme of the utility model the relatively poor problem of spraying quality when having solved the spraying equipment among the prior art and having spouted.

Description

Spraying equipment

Technical Field

The utility model relates to a spraying field particularly, relates to a spraying equipment.

Background

Because real mineral varnish belongs to the solid-liquid mixture state, and the mobility of real mineral varnish is relatively poor, spraying equipment pump sending real mineral varnish needs the power pump to produce certain feed pressure, and the spray gun mouth connects the atmosphere, and pressure intensity is less, and like this, the pressure of pump mouth will be greater than the pressure at the spray gun end far away, and the existence of pipeline frictional resistance, lead to the pressure that leads to in the pump mouth of power pump to the spray gun inlet pipe can reduce gradually, consequently, after power pump and spray gun are closed, can have a great pressure differential in the pipeline, thereby make the coating in the pipeline continue to the propelling movement under the effect of this pressure differential, finally gather at the spray gun end, consequently, the spray gun mouth pressure reduces after opening the spray gun next time, lead to the coating of spray gun feed pipe end to come too late the atomizing and fly out, and then lead to the real mineral varnish of big granule appears in the wall, influence spraying quality.

That is to say, because the phenomenon of suppressing pressure in the pipeline after the spray gun is closed, the phenomenon of paint spray accumulation can occur when the spray gun is started next time, resulting in the problem of poor spraying quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a spraying equipment to solve the spraying equipment among the prior art and play the relatively poor problem of spraying quality when spouting.

In order to achieve the above object, the present invention provides a spraying apparatus, comprising: a power pump; a material conveying pipeline; the feeding end of the power pump is used for being connected with the hopper, and the discharging end of the power pump is connected with the material spraying part through a material conveying pipeline; the pressure blocking prevention device is arranged on the material conveying pipeline and is positioned between the power pump and the material spraying part so as to reduce the pressure blocking phenomenon when the material spraying part starts spraying. Among the above-mentioned setting, through set up the pressure equipment that suppresses on the conveying pipeline, after power pump and material spraying portion close, utilize the pressure equipment that suppresses to cut off the conveying pipeline between power pump and the material spraying portion, like this, the pressure differential between pressure equipment that suppresses and the material spraying portion will be less than the pressure differential between power pump and the material spraying portion far away, therefore can avoid taking place a large amount of coatings in the conveying pipeline and pile up the phenomenon of suppressing in the material spraying portion, thereby avoid the material spraying portion to take place a large amount of coatings when starting to spout and pile up the phenomenon of spouting to the wall, and then improved the spraying quality when the material spraying portion starts to spout.

Furthermore, the spraying equipment also comprises an air compressor connected with the air inlet end of the material spraying part so as to spray the paint in the material spraying part after atomization, and a controller which is respectively connected with the power pump, the material spraying part, the pressure blocking prevention device and the air compressor so as to control the start and stop sequence of the power pump, the material spraying part, the pressure blocking prevention device and the air compressor. The controller controls the power pump, the pressure-holding-preventing device, the air compressor and the start and stop sequence of the material spraying part, so that the pressure difference between the pump opening of the power pump and the material spraying part can be reduced, the pressure-holding accumulation phenomenon when the material spraying part starts to spray next time is obviously reduced, and the spraying quality when the material spraying part starts to spray is greatly improved.

Further, along the extending direction of the material conveying pipeline, the distance between the pressure blocking prevention device and the material spraying part is smaller than the distance between the pressure blocking prevention device and the power pump. In the above-mentioned scheme, pressure build-up prevention device is close to the setting of spouting material portion, like this, can make pressure build-up prevention device and spout the pressure differential between the material portion and be less than the power pump far away and spout the pressure differential between the material portion to avoid taking place a large amount of coatings in the defeated material pipeline better and pile up the pressure build-up phenomenon in spouting the material portion, and then avoid spouting the material portion and take place the inhomogeneous phenomenon of coating spraying when starting to spout, improved the spraying quality when spouting the material portion and start to spout.

Further, the pressure-blocking prevention device is a cut-off valve. In the above scheme, the break-make of defeated material pipeline can be controlled through setting up the shut-off valve to can cut the pressure in the defeated material pipeline after power pump and material portion of spouting close, and then make the pressure of the material portion place end that spouts of defeated material pipeline reduce, and then avoid closing the inside that material portion was piled up in material portion of spouting behind the material portion of spouting, thereby can improve the spraying quality when spouting.

Further, spraying equipment includes a plurality of material portions that spout, and the one end of keeping away from the power pump of defeated material pipeline is provided with a plurality of discharge gates, and a plurality of material portions that spout set up with a plurality of discharge gates one-to-one. Thus, the spraying efficiency can be improved.

Further, the spraying equipment still includes the flow control valve that is used for adjusting the flow that spouts material portion blowout coating, and flow control valve is a plurality of, and a plurality of flow control valves correspond the setting with a plurality of material portions that spout. Among the above-mentioned technical scheme, through setting up a plurality of flow control valves, can adjust the flow of the coating of corresponding material portion of spouting respectively to solve the colour difference problem that leads to because the flow of different material portions of spouting is inconsistent.

Furthermore, the material spraying part is a spray gun, and the flow regulating valve is positioned between the spray gun and the discharge hole; alternatively, the flow control valve is located inside the lance. Therefore, the stepless regulation of the flow of the paint in the paint spraying part can be realized by controlling the opening of the flow regulating valve, and the spraying quality is further improved.

Furthermore, the spraying equipment also comprises a pressure detection device for detecting the conveying pressure in the conveying pipeline, and the pressure detection device is positioned between the power pump and the conveying pipeline or at the discharge end of the power pump. Like this, when spouting material portion when carrying out the spraying to the wall, pressure detection device can continuously detect the pressure in the defeated material pipeline, and after the pressure in the defeated material pipeline exceeded the default, the controller can automatic control power pump make power pump be in the off-state, perhaps triggers alarm module to inform manual handling.

Further, the spraying equipment also comprises a hopper for storing materials and a weighing sensor positioned at the bottom of the hopper. In the above arrangement, after the paint loaded in the hopper is pressurized by the power pump, the power pump pumps the viscous paint to the material spraying part through the material conveying pipeline, and accordingly, the paint in the hopper is gradually reduced, and the weighing sensor positioned at the bottom of the hopper can detect the gravity of the hopper with the paint, so that the quality of the residual material in the hopper is judged, and the problem of misjudgment caused by the fluctuation of the liquid level in the hopper can be well solved.

Further, the spraying equipment also comprises a first air pipe and a second air pipe, and the air compressor is connected with the air inlet end of the material spraying part through the first air pipe; the air compressor is connected with the pressure-holding-preventing device through a second air pipe so as to control the opening and closing of the pressure-holding-preventing device. In the arrangement, compressed air generated by the air compressor is conveyed to the air inlet end of the material spraying part through the first air pipe, and under the action of the compressed air, the coating in the material spraying part is atomized, so that the coating is sprayed to the wall at a high speed, and the aim of uniform spraying is fulfilled; compressed air generated by the air compressor is conveyed to the air inlet end of the pressure-holding-preventing device through the second air pipe, the pressure in the second air pipe is adjusted, the pressure-holding-preventing device can be opened and closed, and the control mode has the advantage of sensitive response.

Use the technical scheme of the utility model, through set up pressure-holding device on the conveying pipeline, close the back at the power pump with material spraying portion, utilize pressure-holding device and can cut the power pump and spout the defeated material pipeline between the material portion, thus, pressure-holding device and the pressure difference between the material spraying portion will be less than the power pump far away and spout the pressure difference between the material portion, therefore can avoid taking place a large amount of coatings in the defeated material pipeline and pile up the phenomenon of pressing-holding out in material spraying portion, thereby avoided spouting a large amount of coatings that material portion easily appears when starting to spout and piled up the phenomenon of spouting to the wall, and then improved the spraying quality when starting to spout.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a spray device according to an embodiment of the invention;

FIG. 2 is a schematic diagram showing the arrangement of the pressure sensing device and power pump connections of the spray coating device of FIG. 1;

FIG. 3 shows a schematic view of the hopper and load cell connection of the spray coating device of FIG. 1; and

fig. 4 shows a partial enlarged view of the spray device of fig. 1.

Wherein the figures include the following reference numerals:

11. a hopper; 12. a power pump; 20. a material spraying part; 30. a material conveying pipeline; 31. a discharge port; 40. a pressure blocking prevention device; 50. an air compressor; 51. a first air pipe; 52. a second air pipe; 60. a pressure detection device; 61. a weighing sensor; 70. a flow regulating valve.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It should be noted that the pressure-holding phenomenon is a phenomenon that after the power pump and the spray gun are closed, a certain pressure difference exists between the pump port of the power pump and the spray gun end (that is, the pressure of the pump port of the power pump is greater than the pressure of the spray gun end), so that the paint in the pipe is continuously pushed to the spray gun end under the action of the pressure difference, and finally the paint is gathered at the spray gun end, that is, the pressure-holding phenomenon.

As shown in fig. 1 and 4, embodiments of the present invention provide a spray coating device. The spraying equipment comprises a power pump 12, a material conveying pipeline 30, a material spraying part 20 and an anti-blocking device 40. Wherein, the feed end of the power pump 12 is used for connecting with the hopper 11, the discharge end of the power pump 12 is connected with the material spraying part 20 through the material conveying pipeline 30; the pressure-holding-prevention device 40 is arranged on the material conveying pipeline 30, and the pressure-holding-prevention device 40 is positioned between the power pump 12 and the material spraying part 20 so as to reduce the pressure-holding phenomenon when the material spraying part 20 starts spraying.

In the above arrangement, the anti-blocking device 40 is arranged on the material conveying pipeline 30, after the power pump 12 and the material spraying part 20 are closed, the material conveying pipeline 30 between the power pump 12 and the material spraying part 20 can be cut off by the anti-blocking device 40, so that the pressure difference between the anti-blocking device 40 and the material spraying part 20 is far smaller than the pressure difference between the power pump 12 and the material spraying part 20, and therefore, the pressure blocking phenomenon that a large amount of paint in the material conveying pipeline 30 is accumulated in the material spraying part 20 can be avoided, the phenomenon that a large amount of paint is accumulated and sprayed to the wall surface when the material spraying part 20 starts spraying is avoided, and the spraying quality when the material spraying part 20 starts spraying is improved.

Preferably, in the embodiment of the present invention, the power pump 12 is configured as a screw pump. Of course, in an embodiment not shown in the drawings, the power pump 12 may be provided as a gear pump or the like.

As shown in fig. 1, in the embodiment of the present invention, the spraying apparatus further includes an air compressor 50 connected to the air inlet of the material spraying portion 20, so that the paint in the material spraying portion 20 is atomized and then sprayed out, and the spraying apparatus further includes a controller, which is respectively connected to the power pump 12, the material spraying portion 20, the pressure-holding-prevention device 40 and the air compressor 50, so as to control the start and stop sequence of the power pump 12, the material spraying portion 20, the pressure-holding-prevention device 40 and the air compressor 50.

In the above arrangement, the air compressor 50 can generate compressed air, and the compressed air is delivered into the material spraying portion 20, so that the paint in the material spraying portion 20 can be atomized under the action of the compressed air, and the atomized paint is sprayed to the surface to be painted of the exterior wall of the building at a high speed, thereby realizing the real stone paint painting of the exterior wall of the building.

Specifically, the utility model discloses an in the embodiment, through with controller control power pump 12, prevent suppressing pressure equipment 40, air compressor 50 and spout the material portion 20 open the precedence of opening and stop, can make the pump mouth of power pump 12 and spout the pressure differential between the material portion 20 and reduce to make the pressure suppressing when spouting material portion 20 next time and pile up the phenomenon and show the reduction, and then improve the spraying quality when spouting material portion 20 and start spouting greatly.

Preferably, in the embodiment of the present invention, the start and stop of the power pump 12, the pressure-holding-prevention device 40, the air compressor 50 and the material spraying part 20 can be controlled according to the start and stop sequence shown in table 1 below:

TABLE 1

	Power pump	Pressure-holding-preventing device	Spraying part	Air compressor
					Closing sequence during spray shut-down	1	2	3	4
Opening sequence during start-up of spray	2	3	4	1

It should be noted that the numbers 1 to 4 represent the sequence of opening or closing, and the smaller the number is, the earlier the opening or closing is, the larger the number is, the later the opening or closing is.

The embodiment of the utility model provides an in, utilize controller or manual mode to open or close above-mentioned power pump 12, prevent suppressing parts such as pressure equipment device 40, air compressor 50 and spout material portion 20 according to the order of table 1, like this, can make spraying equipment spout the material portion and play the suppressing phenomenon when spouting and show the reduction, and then improved the spraying quality when spouting.

As shown in fig. 1, in the embodiment of the present invention, along the extending direction of the material conveying pipeline 30, the distance between the pressure-blocking prevention device 40 and the material spraying portion 20 is smaller than the distance between the pressure-blocking prevention device 40 and the power pump 12.

Through the setting, can make pressure-tight device 40 be close to the setting of spouting material portion 20, like this, can make pressure-tight device 40 and spout the pressure differential between material portion 20 and be less than the pressure differential between power pump 12 and the portion of spouting 20 far away to avoid taking place a large amount of coatings in conveying pipeline 30 and pile up the pressure-tight phenomenon in spouting material portion 20 better, and then avoid spouting material portion 20 and take place the inhomogeneous phenomenon of coating spraying when starting to spout, the spraying quality when having improved material portion 20 and having spouted has been spouted.

Preferably, in the embodiment of the present invention, the material spraying portion 20 of the "distance between the pressure-blocking prevention device 40 and the material spraying portion 20" is the uppermost material spraying portion 20 in fig. 1.

Preferably, as shown in fig. 1 and 4, in an embodiment of the present invention, the pressure-holding prevention device 40 is a shut-off valve.

In the above arrangement, the on-off of the material conveying pipeline 30 can be controlled by the blocking valve, so that the pressure in the material conveying pipeline 30 can be blocked after the power pump 12 and the material spraying part 20 are closed, the pressure at the end of the material spraying part 20 of the material conveying pipeline 30 is reduced, the coating is prevented from being accumulated in the material spraying part 20 after the material spraying part 20 is closed, and the spraying quality during spraying can be improved.

As shown in fig. 1 and 4, in the embodiment of the present invention, the spraying device includes a plurality of material spraying portions 20, one end of the material conveying pipeline 30, which is far away from the power pump 12, is provided with a plurality of material outlets 31, and the plurality of material spraying portions 20 and the plurality of material outlets 31 are arranged in a one-to-one correspondence manner.

By providing a plurality of the material spraying portions 20 to spray the coating material, the spraying efficiency can be improved.

Of course, in an alternative embodiment, the number of the material spraying parts 20 may be less than that of the material outlet ports 31, as long as the material outlet ports 31 where the material spraying parts 20 are not provided are sealed.

As shown in fig. 1, in the embodiment of the present invention, the spraying apparatus further includes a plurality of flow control valves 70 for adjusting the flow of the coating sprayed from the material spraying portion 20, and the plurality of flow control valves 70 are disposed corresponding to the plurality of material spraying portions 20.

In the above technical solution, by providing a plurality of flow control valves 70, the flow of the paint of the corresponding material spraying portions 20 can be respectively adjusted, so as to solve the problem of color difference caused by inconsistent flow of different material spraying portions 20. In addition, the opening degree of the flow regulating valve 70 is controlled, so that the flow of the material spraying part 20 can be regulated steplessly, the flow of the coating sprayed by different material spraying parts 20 is basically the same, and the spraying quality is improved.

Preferably, in the embodiment of the present invention, the flow control valve 70 is a ball valve.

Preferably, as shown in fig. 1, in the embodiment of the present invention, the material spraying portion 20 is a spray gun, and the flow control valve 70 is located between the spray gun and the material outlet 31. Thus, by controlling the opening of the flow regulating valve 70, the flow of the paint in the paint spraying portion 20 can be steplessly regulated, and the spraying quality can be improved.

Of course, in an alternative embodiment not shown in the drawings, the flow regulating valve 70 may be located inside the spray gun.

Real mineral varnish coating is a thick form, the relatively poor solid-liquid mixing state of mobility, so the phenomenon of blockking up defeated material pipeline 30 easily appears, in order to solve above-mentioned problem, the embodiment of the utility model discloses an in, spraying equipment is still including the pressure measurement device 60 that is used for detecting the defeated material pressure in defeated material pipeline 30.

In the embodiment of the present invention, the pressure detection device 60 and the power pump 12 are both connected to the controller, and the controller controls the action of the power pump 12 according to the detection result of the pressure detection device 60. Thus, when the spraying part 20 sprays the wall, the pressure detection device 60 will continuously detect the pressure in the material conveying pipeline 30, and when the pressure in the material conveying pipeline 30 exceeds the preset value, the controller can automatically control the power pump 12 to make the power pump 12 in a closed state, or trigger the alarm module, and notify the manual processing.

Moreover, the phenomenon of pipe explosion caused by continuous rising of pressure in the material conveying pipeline 30 because the power pump 12 continuously pumps the coating after the material conveying pipeline 30 is blocked can be avoided.

Preferably, as shown in fig. 1 and fig. 2, in the embodiment of the present invention, the pressure detecting device 60 is located at the discharge end of the power pump 12, so as to detect the pressure value in the material conveying pipeline 30.

Of course, in an alternative embodiment not shown in the drawings, the pressure sensing device 60 may be located between the power pump 12 and the delivery conduit 30.

Preferably, in the embodiment of the present invention, the pressure detecting device 60 is a flush membrane pressure sensor.

The inventor finds that when the spraying equipment is carried in a hanging basket hung on a steel wire rope for working in long-term work, the liquid level in the hopper can fluctuate greatly due to the shaking of the hanging basket, and thus, when liquid level detection means such as ultrasonic waves and laser are adopted to detect the excess materials in the hopper, a large detection error can be generated. Therefore, the embodiment of the utility model provides an adopt weighing sensor to detect the clout in the hopper.

As shown in fig. 1 and 3, in the embodiment of the present invention, the spraying device further includes a hopper 11 for storing materials and a weighing sensor 61 located at the bottom of the hopper 11.

In the above arrangement, after the paint in the hopper 11 is pressurized by the power pump 12, the power pump 12 pumps the viscous paint to the material spraying portion 20 through the material conveying pipeline 30, and accordingly, the paint in the hopper 11 is gradually reduced, and the weighing sensor 61 located at the bottom of the hopper 11 can detect the gravity of the hopper 11 in which the paint is stored, so as to determine the mass of the remainder in the hopper 11, thereby better solving the problem of misjudgment caused by the fluctuation of the liquid level in the hopper 11.

Preferably, the weighing sensor 61 can be connected with the controller, so that the purposes of automatic material shortage alarm, manual feeding reminding, automatic full-feeding alarm and manual feeding stopping reminding can be achieved.

Preferably, as shown in fig. 3, in the embodiment of the present invention, the number of the load cells 61 is four, and four load cells 61 are respectively disposed at four corner positions of the bottom of the hopper 11.

Of course, in alternative embodiments not shown in the drawings, the number of load cells 61 may be set to two or three, and so on.

As shown in fig. 1, in the embodiment of the present invention, the spraying apparatus further includes a first air pipe 51 and a second air pipe 52, and the air compressor 50 is connected to the air inlet end of the material spraying portion 20 through the first air pipe 51; the air compressor 50 is connected to the anti-blocking device 40 through a second air pipe 52 to control the on/off of the anti-blocking device 40.

In the above arrangement, the compressed air generated by the air compressor 50 is delivered to the air inlet end of the material spraying part 20 through the first air pipe 51, and the paint in the material spraying part 20 is atomized under the action of the compressed air, so as to be sprayed to the wall at a high speed, thereby achieving the purpose of uniform spraying; the compressed air generated by the air compressor 50 is delivered to the air inlet end of the pressure-blocking prevention device 40 through the second air pipe 52, and the pressure in the second air pipe 52 is adjusted to realize the opening and closing of the pressure-blocking prevention device 40.

Preferably, in the embodiment of the present invention, the first air tube 51 and the second air tube 52 are made of polyurethane air tube material.

Preferably, in the embodiment of the present invention, the pressure-blocking prevention device 40 is a pneumatically controlled shut-off valve, and the function of automatically controlling the on/off of the shut-off valve is realized by controlling the pressure of the gas in the second gas pipe 52.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the pressure-holding-preventing device is arranged on the material conveying pipeline, and after the power pump and the material spraying part are closed, the pressure-holding-preventing device can cut off the material conveying pipeline between the power pump and the material spraying part, so that the pressure difference between the pressure-holding-preventing device and the material spraying part is far smaller than the pressure difference between the power pump and the material spraying part, the pressure-holding phenomenon that a large amount of paint in the material conveying pipeline is accumulated in the material spraying part is avoided, the phenomenon that the paint is sprayed uniformly by the material spraying part when the material spraying part starts spraying is avoided, and the spraying quality of the material spraying part when the material spraying part starts spraying is improved; further, through setting up a plurality of material portions of spouting and the flow control valve that corresponds the setting with a plurality of material portions of spouting, not only can improve spraying efficiency, can guarantee a plurality of material portions of spouting moreover and spout the homogeneity of material.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spray coating device, comprising:

a power pump;

a material conveying pipeline;

the feeding end of the power pump is used for being connected with the hopper, and the discharging end of the power pump is connected with the material spraying part through the material conveying pipeline;

the pressure-holding-preventing device is arranged on the material conveying pipeline and is positioned between the power pump and the material spraying part so as to reduce the pressure-holding phenomenon when the material spraying part starts spraying.

2. The spraying equipment of claim 1, further comprising an air compressor connected to an air inlet end of the material spraying part, so that the paint in the material spraying part is atomized and sprayed out, and a controller connected to the power pump, the material spraying part, the pressure blocking prevention device and the air compressor, respectively, so as to control the start and stop sequence of the power pump, the material spraying part, the pressure blocking prevention device and the air compressor.

3. The coating apparatus as claimed in claim 1, wherein, in the direction of extension of the feed delivery conduit, the distance between the pressure build-up prevention means and the material injection portion is smaller than the distance between the pressure build-up prevention means and the power pump.

4. A spray device according to any one of claims 1 to 3, wherein the pressure-blocking device is a shut-off valve.

5. The spraying equipment according to any one of claims 1 to 3, wherein the spraying equipment comprises a plurality of spraying parts, a plurality of discharge ports are arranged at one end of the conveying pipeline away from the power pump, and the plurality of spraying parts are arranged in one-to-one correspondence with the plurality of discharge ports.

6. The coating apparatus according to claim 5, further comprising a plurality of flow control valves for controlling flow rates of the coating materials ejected from the material ejection portions, the plurality of flow control valves being provided in correspondence with the plurality of material ejection portions.

7. The coating apparatus according to claim 6 wherein the material ejection portion is a spray gun, and the flow control valve is located between the spray gun and the discharge port; alternatively, the flow regulating valve is located inside the spray gun.

8. A spray device according to any one of claims 1 to 3 further including pressure sensing means for sensing delivery pressure within said delivery conduit, said pressure sensing means being located between said power pump and said delivery conduit or at the discharge end of said power pump.

9. A spray device according to any one of claims 1 to 3 further comprising a hopper for stock and a load cell located at the bottom of the hopper.

10. The spray coating device of claim 2 further comprising a first air pipe and a second air pipe, said air compressor being connected to an air inlet end of said spray section via said first air pipe; the air compressor is connected with the pressure-holding-preventing device through the second air pipe so as to control the opening and closing of the pressure-holding-preventing device.