Powder spraying device

Abstract

The invention belongs to the technical field of powder spraying devices, and particularly relates to a powder spraying device which comprises a conveying frame and a hollow movable plate, a spraying mechanism is movably installed above the conveying frame, telescopic air bags are movably installed on the two sides of the spraying mechanism, and movement of the spraying mechanism is achieved through inflation and deflation of the two telescopic air bags. An auxiliary mechanism is further installed above the conveying frame, a dust collecting assembly is fixedly installed on the side edge of the auxiliary mechanism, the nickel net is placed on the hollow movable plate to be conveyed, after the nickel net is conveyed to the position of the spraying mechanism, the spraying mechanism sprays Raney nickel powder on the nickel net in a thermal spraying or plasma spraying mode, and the nickel net is sprayed through the dust collecting assembly. Suction is conducted through the air suction structure, so that suction force is generated on the side, facing the U-shaped connecting piece, of the air suction frame strip, dust at the position where the U-shaped connecting piece is located is sucked into the air suction frame strip and then conveyed into the filter bag through the air suction structure, and the filter bag releases air, filters the dust and collects the dust.

Description

Technical Field

[0001] The invention belongs to the field of powder spraying devices, in particular to a powder spraying device. Background Art

[0002] A powder spraying device is a device used to spray powdered materials. The general spraying process includes conveying the required mesh, plate or block to the bottom of the nozzle through a conveying device, and then releasing the powder through the nozzle to spray the required mesh, plate or block. When the powder spraying device is used in the preparation of alkaline hydrogen production electrodes, the Raney nickel powder will be sprayed on the nickel mesh by a nozzle through thermal spraying or plasma spraying to form a three-dimensional porous structure to increase the catalytic activity and hydrogen production efficiency.

[0003] A patent document with publication number CN115608531B discloses a large-diameter steel pipe melt-blown anti-corrosion spraying equipment, including a powder box and a recovery pipe sealed and connected at the bottom thereof, the powder box including a powder spraying module, a box body and an exhaust box, the upper part of the box body is inclined forward and upward, the upper end of the box body is open, and the left and right edges are arranged to be arc-shaped to adapt to the inner wall of the steel pipe to be sprayed.

[0004] In the traditional technical solution, when preparing the nickel mesh, the Raney nickel powder is sprayed onto the nickel mesh through a movable spray head to complete the spraying work. During the spraying process, most of the spray will adhere to the nickel mesh, and a small part will settle on the spraying device due to gravity. During the movement of the spray head, the electrical component belt connected to it will be continuously driven to move, and then the settled powder at the position of the electrical component belt will be beaten, causing dust in the working environment to fly everywhere, affecting the working environment, and the flying dust will clog the internal structure of the device, aggravating the degree of damage to the device.

[0005] To this end, the present invention provides a powder spraying device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a powder spraying device according to the present invention comprises a transport frame and a hollow movable plate movably mounted on the transport frame, a spraying mechanism is movably mounted above the transport frame, telescopic airbags are movably mounted on both sides of the spraying mechanism, the movement of the spraying mechanism is realized by charging and deflating the two telescopic airbags, an auxiliary mechanism is also mounted above the transport frame, and a dust collecting assembly is fixedly mounted on the side of the auxiliary mechanism; The auxiliary mechanism includes a cross frame bar fixedly installed above the transport frame, two cross frame bars are fixedly installed above the cross frame bar, the telescopic airbag is located between the two blocking bars, and two air pressure pumps are fixedly installed above the cross frame bar, and gas is transported to the corresponding telescopic airbags through the two air pressure pumps; The dust collecting assembly comprises an air suction frame bar fixedly mounted on the side of the blocking bar, an air suction structure is fixedly mounted on the end of the air suction frame bar, and a filter bag is fixedly mounted on one side of the air suction structure.

[0008] Preferably, a mechanism bar is fixedly installed above the cross bar, and the mechanism bar is located on the side of the blocking bar. The spraying mechanism includes a spraying platform slidably installed on the cross bar, and the spraying platform is located between the two blocking bars. The two sides of the spraying platform are fixedly connected to the ends of the two telescopic airbags, and a movable nozzle is installed on the side of the spraying platform.

[0009] Preferably, a U-shaped connector is movably mounted on the spraying platform toward the side of the mechanism bar, an electrical element for power supply is mounted inside the U-shaped connector, and one end of the U-shaped connector is located inside the mechanism bar.

[0010] Preferably, the air suction frame includes a frame bar and a plurality of air inlet grooves opened on the side of the frame bar, a guide bar is fixedly installed inside the frame bar, a plurality of compressed air bags are movably installed inside the guide bar, and a plurality of ventilation grooves are opened on the sides of the compressed air bags facing the air inlet grooves.

[0011] Preferably, a connecting strip is fixedly installed on the end side of the compression airbag, a through groove 1 is opened inside the blocking strip, and a plurality of the connecting strips penetrate the frame strip and the through groove 1 to be connected to the side of the telescopic airbag.

[0012] Preferably, the telescopic airbag includes a plurality of movable plates movably installed between two of the barrier bars, a telescopic cloth is installed between two adjacent movable plates, the telescopic cloth surrounds the two adjacent movable plates, and a through groove is opened through the interior of the telescopic airbag.

[0013] Preferably, a plurality of air blocking sheets are installed on the inner wall of the frame bar, the bottom ends of the air blocking sheets cover the corresponding air inlet grooves, and the upper ends of the air blocking sheets are fixedly connected to the inner wall of the frame bar.

[0014] Preferably, the guide strip is fixedly installed inside the frame strip, the guide strip is provided with a second through groove on the side facing the telescopic airbag, the connecting strip slides inside the second through groove, a bottom through groove is provided at the bottom of the guide strip, and an air intake strip groove is provided on the side facing the air intake groove.

[0015] Preferably, the compression airbag comprises two movable plates 2, two compression cloths are installed between the two movable plates 2, a deformation bag is fixedly installed between the two compression cloths, a plurality of ventilation grooves are opened on the side of the deformation bag, and a through groove 2 is opened through the interior of the compression airbag.

[0016] Preferably, a plurality of strip-shaped air outlet grooves are provided at the bottom of the compressed air bag, and the strip-shaped air outlet grooves, the ventilation grooves and the through grooves are interconnected.

[0017] The beneficial effects of the present invention are as follows: 1. A powder spraying device described in the present invention is a device that places a nickel mesh on a hollow movable plate for transportation. When the nickel mesh is transported to the position of the spraying mechanism, the spraying mechanism sprays the Raney nickel powder on the nickel mesh by thermal spraying or plasma spraying, and suction is performed through an exhaust structure, so that the suction frame generates suction force toward one side of the U-shaped connector, and the dust at the position of the U-shaped connector is absorbed into the inside of the suction frame, and then transmitted to the inside of the filter bag through the exhaust structure. The filter bag will release the gas but filter the dust and collect the dust.

[0018] 2. The powder spraying device described in the present invention absorbs external air and dust into the interior of the suction frame strips through ventilation grooves and air inlet grooves. When multiple ventilation grooves follow the shrinkage and deformation of the corresponding telescopic air bags, an automatic opening valve can be used instead due to the special effect of the air inlet grooves that allows entry but not exit. The gases released by the shrinkage of multiple compressed air bags will not be released from the air inlet grooves, but released into the interior of the filter bag through the exhaust structure. When the spraying platform is moving and spraying, the multiple compressed air bags arranged in the device can continuously collect external dust into the interior of the suction frame strips. When the dust is collected to a certain extent, the exhaust structure is started to continuously suck the dust inside the suction frame strips to make it enter the interior of the filter bag.

[0019] 3. A powder spraying device described in the present invention, when air is sucked through the ventilation groove, will drive the air barrier plate to bend as a whole except for the fixed upper end, and thus no longer cover the air inlet groove, so that the outside air and dust enter the interior of the air suction frame strip through the air inlet groove; when the air inside the compressed airbag is released from the ventilation groove, the release force of the gas will resist the air barrier plate, so that the lower end of the air barrier plate always covers the side of the air inlet groove, so that the gas inside the air suction frame strip and the dust carried in the gas will not appear in the working environment; the height of the air inlet strip groove is greater than the diameters of the ventilation groove and the air inlet groove, which facilitates the entry of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is an overall stereogram of the present invention; Figure 2 It is a three-dimensional schematic diagram of the spraying mechanism in the present invention; Figure 3 It is a three-dimensional schematic diagram of the barrier strip in the present invention; Figure 4 It is a three-dimensional schematic diagram of the dust collecting assembly in the present invention; Figure 5 It is a three-dimensional schematic diagram of the air suction frame in the present invention; Figure 6 It is a three-dimensional schematic diagram of the gas barrier sheet of the present invention; Figure 7 It is a three-dimensional schematic diagram of the telescopic airbag in the present invention; Figure 8 It is a three-dimensional schematic diagram of the guide strip in the present invention; Fig. 9 It is a three-dimensional schematic diagram of the compressed air bag in the present invention; Fig.10 It is a three-dimensional schematic diagram of the strip-shaped air outlet groove in the present invention.

[0022] In the figure: 1. transport rack; 2. hollow movable plate; 3. spraying mechanism; 31. spraying table; 32. movable nozzle; 33. U-shaped connector; 4. telescopic airbag; 41. movable plate 1; 42. telescopic cloth; 43. through slot 1; 5. dust collection component; 6. auxiliary mechanism; 61. blocking bar; 611. through slot 1; 62. air pressure pump; 63. mechanism bar; 64. horizontal frame bar; 7. suction rack Strip; 71, frame strip; 72, air inlet groove; 73, compression air bag; 731, movable plate 2; 732, compression cloth; 733, deformation bag; 734, through groove 2; 735, strip air outlet groove; 74, ventilation groove; 75, guide strip; 751, through groove 2; 752, bottom through groove; 753, air inlet strip groove; 76, air blocking sheet; 77, connecting strip; 8, exhaust structure; 9, filter bag. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Embodiment 1

[0024] like Figure 1-Figure 4 As shown, a powder spraying device according to an embodiment of the present invention comprises a transport frame 1 and a hollow movable plate 2 movably mounted on the transport frame 1, a spraying mechanism 3 is movably mounted above the transport frame 1, telescopic air bags 4 are movably mounted on both sides of the spraying mechanism 3, the movement of the spraying mechanism 3 is achieved by charging and deflating the two telescopic air bags 4, an auxiliary mechanism 6 is further mounted above the transport frame 1, and a dust collecting assembly 5 is fixedly mounted on the side of the auxiliary mechanism 6; The auxiliary mechanism 6 includes a cross frame bar 64 fixedly installed above the transport frame 1, two cross frame bars 64 are fixedly installed above the cross frame bar 64, the telescopic airbag 4 is located between the two blocking bars 61, and two air pressure pumps 62 are fixedly installed above the cross frame bar 64, and gas is transported to the corresponding telescopic airbag 4 through the two air pressure pumps 62; The dust collecting assembly 5 includes an air suction frame bar 7 fixedly mounted on the side of the blocking bar 61 , an exhaust structure 8 is fixedly mounted on the end of the air suction frame bar 7 , a filter bag 9 is fixedly mounted on one side of the exhaust structure 8 , and the spraying mechanism 3 includes a U-shaped connector 33 .

[0025] Specifically, when working in this device, firstly, the nickel mesh is placed on the hollow movable plate 2 for transportation. After the nickel mesh is transported to the position of the spraying mechanism 3, the spraying mechanism 3 sprays the Raney nickel powder on the nickel mesh by thermal spraying or plasma spraying. In the process of powder spraying, part of the powder will diffuse in the working environment. In order not to affect the moving accuracy of the spraying mechanism 3, a telescopic airbag 4 that can be inflated and deflated is generally used to push the spraying mechanism 3 to move. One telescopic airbag 4 is inflated and expanded, while the other telescopic airbag 4 is deflated and shrunken. In the process of gas pushing, the spraying mechanism 3 will be driven to move. In this way, the dust in the working environment can be prevented from affecting the precise movement of the spraying mechanism 3, and the spraying The platform 31 is powered by the electronic components inside the U-shaped connector 33. When the spraying platform 31 is performing mobile spraying, it will drive the U-shaped connector 33 to move back and forth, thereby causing the U-shaped connector 33 to reciprocate and hit the corresponding position, so that the dust at the location is blown up, which is not conducive to the settlement of dust in the working environment itself, and the dust that diffuses again may fall into the inside of the device, affecting the working life of the device. Suction is performed through the exhaust structure 8, so that the suction frame 7 generates suction toward one side of the U-shaped connector 33, and the dust at the location of the U-shaped connector 33 is absorbed into the inside of the suction frame 7, and then transmitted to the inside of the filter bag 9 through the exhaust structure 8. The filter bag 9 will release the gas, but filter out the dust and collect the dust.

[0026] like Figure 2 As shown, a mechanism bar 63 is fixedly installed above the cross bar 64, and the mechanism bar 63 is located on the side of the blocking bar 61. The spraying mechanism 3 includes a spraying platform 31 slidably installed on the cross bar 64, and the spraying platform 31 is located between the two blocking bars 61. The two sides of the spraying platform 31 are fixedly connected to the ends of the two telescopic airbags 4, and a movable nozzle 32 is installed on the side of the spraying platform 31.

[0027] The U-shaped connector 33 is movably mounted on the side of the spraying platform 31 facing the mechanism bar 63 . An electrical component for power supply is installed inside the U-shaped connector 33 . One end of the U-shaped connector 33 is located inside the mechanism bar 63 .

[0028] Specifically, the air pressure pump 62 is used to inflate and deflate the telescopic airbags 4 at the corresponding positions, so that one telescopic airbag 4 is inflated and expanded, and the other telescopic airbag 4 is deflated and shrunk, thereby adjusting the positions of the spraying platform 31 and the movable nozzle 32. When the spraying platform 31 is moving, one end of the U-shaped connector 33 is inside the mechanism bar 63 and connected to the external air supply device, while the other end is fixedly installed on the lower side of the spraying platform 31. Therefore, the U-shaped position of the U-shaped connector 33 will continue to deform to adapt to the movement of the spraying platform 31. After the U-shaped connector 33 is deformed, it will beat the dust at its location.

[0029] like Figure 5 and Figure 7 As shown, the air suction frame bar 7 includes a frame bar 71 and a plurality of air inlet grooves 72 opened on the side of the frame bar 71, a guide bar 75 is fixedly installed inside the frame bar 71, a plurality of compressed air bags 73 are movably installed inside the guide bar 75, a plurality of compressed air bags 73 are opened on the side facing the air inlet groove 72, a connecting bar 77 is fixedly installed on the end side of the compressed air bag 73, a through groove 611 is opened inside the blocking bar 61, and a plurality of connecting bars 77 penetrate the frame bar 71 and are connected to the through groove 611 and the side of the telescopic air bag 4.

[0030] Specifically, a plurality of compressed air bags 73 are movably installed inside the air suction frame bar 7, and the plurality of compressed air bags 73 are guided by the guide bar 75. The plurality of compressed air bags 73 are connected to the corresponding sides of the telescopic air bags 4 through the side connecting strips 77, which is equivalent to that when the telescopic air bags 4 are inflated, the overall length of the telescopic air bags 4 becomes longer, which will drive the plurality of compressed air bags 73 to stretch, that is, at this time, the lengths of the plurality of compressed air bags 73 are elongated, and the internal workpieces of the elongated compressed air bags 73 change from flat to wide. Under the influence of air pressure, the external air will be absorbed into the compressed air bags 73 through the plurality of ventilation grooves 74. At this time, an air inlet groove 72 that allows entry but not exit is set on the side of the air inlet groove 72, and the air inlet groove 72 faces the side of the U-shaped connector 33, that is, when When the multiple compressed air bags 73 follow the deformation and stretch, they will absorb the outside air and dust into the interior of the suction frame strip 7 through the ventilation grooves 74 and the air inlet grooves 72. When the multiple ventilation grooves 74 follow the corresponding telescopic air bags 4 to shrink and deform, due to the special effect of the air inlet grooves 72 that allows entry but not exit, an automatic opening valve can be used instead. The gas released by the shrinkage of the multiple compressed air bags 73 will not be released from the air inlet grooves 72, but will be released into the filter bag 9 through the exhaust structure 8. When the spraying table 31 is moving and spraying, the multiple compressed air bags 73 arranged in the device can continuously collect external dust into the interior of the suction frame strip 7. When the dust is collected to a certain extent, the exhaust structure 8 is started to continuously suck the dust inside the suction frame strip 7, so that it enters the filter bag 9.

[0031] like Figure 6-Figure 8As shown, the telescopic airbag 4 includes a plurality of movable plates 41 movably installed between two blocking bars 61, a telescopic cloth 42 is installed between two adjacent movable plates 41, the telescopic cloth 42 surrounds the two adjacent movable plates 41, a through groove 43 is opened through the interior of the telescopic airbag 4, a plurality of air blocking sheets 76 are installed on the inner wall of the frame bar 71, the bottom end of the air blocking sheet 76 covers the corresponding air inlet groove 72, and the upper end of the air blocking sheet 76 is fixedly connected to the inner wall of the frame bar 71.

[0032] The guide bar 75 is fixedly installed inside the frame bar 71, and a through groove 751 is provided on the side of the guide bar 75 facing the telescopic airbag 4. The connecting bar 77 slides inside the through groove 751. A bottom through groove 752 is provided at the bottom of the guide bar 75, and an air intake strip groove 753 is provided on the side of the guide bar 75 facing the air intake groove 72.

[0033] Specifically, air blocking sheets 76 are provided on the sides of the plurality of air inlet grooves 72. When the ventilation grooves 74 inhale air, the air blocking sheets 76 will bend as a whole except for the fixed upper end, and will no longer cover the air inlet grooves 72, allowing external air and dust to enter the interior of the air suction frame strip 7 through the air inlet grooves 72. When the air inside the compressed air bag 73 is released from the ventilation grooves 74, the release force of the gas will resist the air blocking sheet 76, so that the lower end of the air blocking sheet 76 always covers the side of the air inlet grooves 72, so that the gas inside the air suction frame strip 7 and the dust carried in the gas will not appear in the working environment. The height of the air inlet strip grooves 753 is greater than the diameters of the ventilation grooves 74 and the air inlet grooves 72, which facilitates the entry of gas. Embodiment 2

[0034] like Figure 9-10 As shown, compared with Example 1, another embodiment of the present invention is: the compression airbag 73 includes two movable plates 731, two compression cloths 732 are installed between the two movable plates 731, a deformation bag 733 is fixedly installed between the two compression cloths 732, a plurality of ventilation grooves 74 are opened on the side of the deformation bag 733, a through groove 734 is opened through the interior of the compression airbag 73, and a plurality of strip-shaped air outlet grooves 735 are opened at the bottom of the compression airbag 73, and the strip-shaped air outlet grooves 735, the ventilation grooves 74 and the through grooves 734 are connected to each other.

[0035] Specifically, the movable plate 2 731 is connected to the corresponding movable plate 1 41 through the connecting strip 77. When the telescopic airbag 4 is inflated, the distance between the two adjacent movable plates 1 41 increases. At this time, the distance between the two adjacent movable plates 2 731 increases, causing the compression cloth 732 and the deformation bag 733 to stretch and deform. At this time, the ventilation groove 74 will absorb gas from the outside into the through groove 2 734, that is, the external gas and dust are all in the through groove 2 734. When the adjacent movable plate 2 731 follows the adjacent telescopic airbag 4 to reduce the distance, the compression cloth 732 and the ventilation groove 74 shrink and deform. At this time, the gas and dust inside the through groove 2 734 will be released from the ventilation groove 74 and the strip-shaped air outlet groove 735 at the bottom. The released gas and dust will be retained in the suction frame strip 7, and part of the gas and dust will enter the filter bag 9 through the exhaust structure 8, so that the dust and gas inside multiple compressed airbags 73 can be emptied to facilitate the next suction work.

[0036] Working principle: When working in this device, first place the nickel mesh on the hollow movable plate 2 for transportation. When the nickel mesh is transported to the position of the spraying mechanism 3, the spraying mechanism 3 sprays the Raney nickel powder on the nickel mesh by thermal spraying or plasma spraying. During the powder spraying process, part of the powder will diffuse in the working environment. In order not to affect the movement accuracy of the spraying mechanism 3, a telescopic airbag 4 that can be inflated and deflated is generally used to push the spraying mechanism 3 to move. One telescopic airbag 4 is inflated and expanded, while the other telescopic airbag 4 is deflated and shrunken. In the process of gas pushing, the spraying mechanism 3 will be driven to move. In this way, the dust in the working environment can be prevented from affecting the precision movement of the spraying mechanism 3, and the spraying The material table 31 is powered by the electronic components inside the U-shaped connector 33. When the spraying table 31 is performing mobile spraying, it will drive the U-shaped connector 33 to move back and forth, thereby causing the U-shaped connector 33 to reciprocate and hit the corresponding position, so that the dust at the location is blown up, which is not conducive to the settlement of dust in the working environment itself, and the dust that diffuses again may fall into the inside of the device, affecting the working life of the device. Suction is performed through the exhaust structure 8, so that the suction frame 7 generates suction toward one side of the U-shaped connector 33, and the dust at the location of the U-shaped connector 33 is absorbed into the inside of the suction frame 7, and then transmitted to the inside of the filter bag 9 through the exhaust structure 8. The filter bag 9 will release the gas, but filter out the dust and collect the dust.

[0037] A plurality of compressed air bags 73 are movably installed inside the air suction frame strip 7, and the plurality of compressed air bags 73 are guided by the guide strip 75. The plurality of compressed air bags 73 are connected to the corresponding side edges of the telescopic air bags 4 through the side connecting strips 77, which is equivalent to that when the telescopic air bags 4 are inflated, the overall length of the telescopic air bags 4 becomes longer, which will drive the plurality of compressed air bags 73 to stretch, that is, at this time, the lengths of the plurality of compressed air bags 73 are elongated, and the internal workpieces of the elongated compressed air bags 73 are changed from flat to wide. Under the influence of air pressure, the external air will be absorbed into the compressed air bags 73 through the plurality of ventilation grooves 74. At this time, an air inlet groove 72 that allows entry but not exit is set on the side of the air inlet groove 72, and the air inlet groove 72 faces the side of the U-shaped connector 33, that is, when the plurality of compressed air bags 73 are inflated, the air inlet groove 72 is directed to the side of the U-shaped connector 33. When the compressed airbag 73 follows the deformation and stretches, it will absorb the outside air and dust into the interior of the suction frame 7 through the ventilation groove 74 and the air inlet groove 72. When the multiple ventilation grooves 74 follow the corresponding telescopic airbags 4 to shrink and deform, due to the special effect of the air inlet groove 72 that allows entry but not exit, an automatic opening valve can be used instead. The gas released by the shrinkage of the multiple compressed airbags 73 will not be released from the air inlet groove 72, but will be released into the filter bag 9 through the exhaust structure 8. When the spraying table 31 is moving and spraying, the multiple compressed airbags 73 arranged in this device can continuously collect external dust into the suction frame 7. When the dust is collected to a certain extent, the exhaust structure 8 is started to continuously suck the dust inside the suction frame 7, so that it enters the filter bag 9.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A powder spraying device, comprising a transport frame (1) and a hollow movable plate (2) movably mounted on the transport frame (1), a spraying mechanism (3) movably mounted above the transport frame (1), and telescopic air bags (4) movably mounted on both sides of the spraying mechanism (3), characterized in that: The movement of the spraying mechanism (3) is achieved by inflating and deflating the two telescopic airbags (4); an auxiliary mechanism (6) is also installed above the transport frame (1); a dust collecting assembly (5) is fixedly installed on the side of the auxiliary mechanism (6); and the spraying mechanism (3) performs spraying by means of thermal spraying or plasma spraying; The auxiliary mechanism (6) comprises a cross bar (64) fixedly mounted above the transport frame (1), two cross bars (64) fixedly mounted above the cross bar (64), the telescopic airbag (4) is located between the two blocking bars (61), and two air pressure pumps (62) are fixedly mounted above the cross bar (64), and gas is transported to the inside of the corresponding telescopic airbag (4) through the two air pressure pumps (62); The dust collecting assembly (5) comprises an air suction frame bar (7) fixedly mounted on the side of the blocking bar (61), an air suction structure (8) fixedly mounted on the end of the air suction frame bar (7), a filter bag (9) fixedly mounted on one side of the air suction structure (8), and the spraying mechanism (3) comprises a U-shaped connecting piece (33).

2. A powder spraying device according to claim 1, characterized in that: A mechanism bar (63) is fixedly mounted above the cross bar (64), and the mechanism bar (63) is located on the side of the blocking bar (61). The spraying mechanism (3) includes a spraying platform (31) slidably mounted on the cross bar (64), and the spraying platform (31) is located between the two blocking bars (61). The two sides of the spraying platform (31) are fixedly connected to the ends of the two telescopic airbags (4), and a movable spray head (32) is installed on the side of the spraying platform (31).

3. A powder spraying device according to claim 2, characterized in that: The U-shaped connecting piece (33) is movably mounted on the side of the spraying platform (31) facing the mechanism bar (63), an electrical element for power supply is installed inside the U-shaped connecting piece (33), and one end of the U-shaped connecting piece (33) is located inside the mechanism bar (63).

4. A powder spraying device according to claim 1, characterized in that: The air suction frame bar (7) comprises a frame bar (71) and a plurality of air inlet grooves (72) provided on the side of the frame bar (71); a guide bar (75) is fixedly installed inside the frame bar (71); a plurality of compressed air bags (73) are movably installed inside the guide bar (75); and a plurality of ventilation grooves (74) are provided on the sides of the plurality of compressed air bags (73) facing the air inlet grooves (72).

5. A powder spraying device according to claim 4, characterized in that: A connecting strip (77) is fixedly mounted on the side edge of the end of the compression airbag (73), a through groove (611) is provided inside the blocking strip (61), and a plurality of the connecting strips (77) penetrate the frame strip (71) and the through groove (611) to be connected to the side edge of the telescopic airbag (4).

6. A powder spraying device according to claim 5, characterized in that: The telescopic airbag (4) comprises a plurality of movable plates (41) movably mounted between two blocking bars (61), a telescopic cloth (42) being mounted between two adjacent movable plates (41), the telescopic cloth (42) surrounding the two adjacent movable plates (41), and a through groove (43) penetrating the interior of the telescopic airbag (4).

7. A powder spraying device according to claim 4, characterized in that: A plurality of air blocking sheets (76) are mounted on the inner wall of the frame bar (71); the bottom ends of the air blocking sheets (76) cover the corresponding air inlet grooves (72); and the upper ends of the air blocking sheets (76) are fixedly connected to the inner wall of the frame bar (71).

8. A powder spraying device according to claim 5, characterized in that: The guide strip (75) is fixedly mounted inside the frame strip (71); a second through groove (751) is provided on the side of the guide strip (75) facing the telescopic airbag (4); the connecting strip (77) slides inside the second through groove (751); a bottom through groove (752) is provided on the bottom of the guide strip (75); and an air intake strip groove (753) is provided on the side of the guide strip (75) facing the air intake groove (72).

9. A powder spraying device according to claim 4, characterized in that: The compression airbag (73) comprises two movable plates (731), two compression cloths (732) are installed between the two movable plates (731), a deformation bag (733) is fixedly installed between the two compression cloths (732), a plurality of ventilation grooves (74) are opened on the side of the deformation bag (733), and a through groove (734) is opened through the interior of the compression airbag (73).

10. A powder spraying device according to claim 9, characterized in that: A plurality of strip-shaped air outlet grooves (735) are provided at the bottom of the compressed air bag (73), and the strip-shaped air outlet grooves (735), the venting groove (74) and the second through groove (734) are connected.

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