Automatic collecting device for sprayed powder of offset press

Abstract

The invention relates to the technical field of sprayed powder collecting equipment, in particular to an offset press sprayed powder automatic collecting device which comprises a collecting box, a powder pumping cover is arranged on one side of the collecting box, an air pumping pipe stretching into the collecting box is arranged at the top of the collecting box, and multiple sets of cleaning pieces capable of moving towards the axis of the collecting box are movably installed on the collecting box. An elastic membrane is arranged in the collecting box; the air suction cylinder is coaxially provided with an air suction sleeve, the air suction sleeve is rotatably connected with the air suction pipe, the bottom of the air suction cylinder is provided with a guide sleeve, the air suction pipe is slidably provided with a guide column for guiding the guide sleeve to rotate, the air suction sleeve is communicated with the air suction pipe when the guide column ascends to a limit position, and the bottom of the guide column is provided with a shifting part for shifting the elastic membrane; an arc-shaped guide groove is formed in the bottom of the exhaust cylinder, an L-shaped plate stretching into the arc-shaped guide groove is arranged at the bottom of the cleaning piece, and the cleaning piece is driven to move close to and away from the exhaust cylinder when the exhaust cylinder rotates. The device can automatically collect sprayed powder, regular automatic cleaning is achieved, and the stability of powder suction and collection of the device is kept.

Description

Technical Field

[0001] The invention relates to the technical field of spray powder collecting equipment, and in particular to an automatic spray powder collecting device for an offset printing machine. Background Art

[0002] During the offset printing machine production process, powder spraying is required between each printed product to prevent the back of the printed product from getting dirty and to improve printing quality and efficiency. The powder spraying is refined from pure natural plants (such as corn flour) as raw materials.

[0003] However, during the powder spraying process of the offset printing machine, the powder sprayed by the offset printing machine is not completely attached to each product, and some of the powder will diffuse in the air. The powder dispersed in the air will remain on the surface of the equipment or be inhaled by the human body, thus posing a hidden danger to equipment safety and personal health.

[0004] In the prior art, when the spray powder in the air is extracted by the exhaust equipment, the extracted and collected spray powder cannot be automatically collected, and the collected spray powder cannot be well separated from the extraction chamber, resulting in the collected spray powder being adsorbed on the dust filter bag again during the extraction and collection process, resulting in the extraction effect being affected and the extraction efficiency being reduced. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatic collection device for offset printing press powder, which can effectively solve the problem in the prior art that the collected powder cannot be well separated, resulting in the collected powder being adsorbed again, affecting the extraction efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides an automatic collection device for spray powder of an offset printing machine, comprising: A collecting box, wherein a powder extraction cover is provided on one side of the collecting box, and an air extraction pipe is provided on the top of the collecting box and extends into the collecting box, and a plurality of cleaning members that can move toward the axis of the collecting box are movably mounted on the collecting box, and an elastic diaphragm is provided at the bottom of the cleaning members in the collecting box; A vacuum pump, wherein a vacuum sleeve is coaxially mounted on the vacuum pump, and the vacuum sleeve is rotatably connected to the vacuum pipe, a guide sleeve is provided at the bottom of the vacuum pump, and a guide column for guiding the guide sleeve to rotate is slidably mounted on the vacuum pipe, the vacuum sleeve is connected to the vacuum pipe when the guide column rises to the limit position, and a toggle member for toggling the elastic diaphragm is provided at the bottom of the guide column; An arc-shaped guide groove is arranged at the bottom of the vacuum pump, and an L-shaped plate extending into the arc-shaped guide groove is arranged at the bottom of the cleaning piece, so that the cleaning piece is driven to move toward or away from the vacuum pump when the vacuum pump rotates.

[0007] Furthermore, a straight guide groove is provided on the collection box, and one end of the straight guide groove faces the axis of the collection box, and the other end faces the axis away from the collection box. A fixed column is provided on the top of the cleaning piece, and the fixed column is slidably connected to the collection box and extends into the straight guide groove.

[0008] Furthermore, the cleaning pieces are provided in four groups and distributed in a circular array on the collection box, and the cleaning pieces are staggered with the air inlet end of the powder extraction cover, and a brush is provided on one side of the cleaning piece close to the outer wall of the vacuum cylinder.

[0009] Furthermore, a fixed ring for discharging is provided at the center of the elastic diaphragm, and the fixed ring is slidably connected to the guide sleeve. When the vacuum pipe is evacuating air and the powder suction cover is sucking powder normally, the fixed ring rises with the toggle member and fits against the outer wall of the guide sleeve.

[0010] Furthermore, a dust filter bag is provided on the vacuum cylinder, a first vacuum hole is provided on the vacuum pipe, and a second vacuum hole is provided on the vacuum sleeve.

[0011] Furthermore, the angle between adjacent air extraction holes one is a, the angle between adjacent air extraction holes two is b, the air extraction holes one and two are staggered, and the angle between adjacent air extraction holes one and two is c, and a:b:c is 2:2:1.

[0012] Furthermore, a vertical slide groove is provided in the exhaust pipe, and a guide piece is provided in the exhaust pipe. A sealing plug disc is provided on the top of the guide column. When the exhaust pipe is evacuated, the sealing plug disc is first sucked up, and when the sealing plug disc reaches the guide piece, the exhaust pipe and the powder extraction hood are connected.

[0013] Furthermore, a guide block is provided on the guide column, a spring-shaped guide groove is provided in the guide sleeve, and the guide block extends into the spring-shaped guide groove. When the sealing plug disc drives the guide column to rise, the guide sleeve and the vacuum cylinder are driven to rotate.

[0014] Furthermore, the sealing plug disc is in the shape of an inverted cone, and an air inlet groove is provided on the guide member.

[0015] Beneficial Effects Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. Suction the air through the suction pipe to drive the sealing plug disc to rise along the inner wall of the suction pipe. At this time, the guide block set on the guide column at the bottom of the sealing plug disc cooperates with the spring-shaped guide groove in the guide sleeve to guide the guide sleeve to rotate, thereby driving the suction cylinder and the suction sleeve to rotate. When the sealing plug disc rises to a high position, the suction sleeve is driven to rotate c degrees, so that the suction hole 1 and the suction hole 2 coincide with each other. At the same time, the sealing plug disc is at the air inlet groove on the guide part, and the gas is extracted from the bottom and side of the suction sleeve at the same time, and the external spray powder is collected into the collection box in cooperation with the powder extraction cover. When the sealing plug disc rises to a high position, the toggle piece at the bottom of the guide column pulls the fixing ring up and fits the outer wall of the guide sleeve to prevent the spray powder collected at the bottom of the collection box from being extracted. When the extraction work is stopped, the sealing plug disc descends and cooperates with the guide column to squeeze the fixing ring again. At this time, the elastic diaphragm is in a funnel shape to guide the collected spray powder into the bottom of the collection box for centralized collection, thereby realizing automatic collection. 2. When the vacuum pipe is evacuating air, the guide column cooperates with the guide sleeve to drive the vacuum cylinder to rotate. When the vacuum cylinder rotates, the arc-shaped guide groove guides the fixed column to move in the direction away from the vacuum cylinder, thereby driving the cleaning piece away from the outer wall of the vacuum cylinder to prevent the cleaning piece from covering the vacuum cylinder and affecting the suction and collection of the spray powder. When the work is stopped, the sealing plug plate descends and cooperates with the guide column and the guide sleeve to make the vacuum cylinder rotate in the opposite direction. At this time, the arc-shaped guide groove at the bottom of the vacuum cylinder guides the cleaning piece to move toward the vacuum cylinder, and the brush on one side of the cleaning piece contacts the outer wall of the vacuum cylinder. At this time, in conjunction with the rotation of the vacuum cylinder, the spray powder adsorbed on the surface of the dust filter bag on the outer wall of the vacuum cylinder is cleaned, thereby achieving regular and automatic cleaning and maintaining the stability of the equipment's powder suction and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 This is a state change diagram of the collecting box of the present invention when air is pumped out; Figure 4 It is a partial cross-sectional view of the vacuum pump of the present invention when vacuuming; Figure 5 It is a partial cross-sectional view of the vacuum pump of the present invention when it is not vacuuming; Figure 6 It is a schematic diagram of the structure of the air extraction pipe, the air extraction sleeve and the sealing plug disc of the present invention; Figure 7It is a schematic diagram of the positions of the first exhaust hole on the exhaust pipe and the second exhaust hole on the exhaust sleeve of the present invention.

[0018] Figure numerals: 1. collecting box; 101. straight guide groove; 11. powder extraction cover; 12. exhaust pipe; 121. exhaust hole one; 122. guide member; 13. cleaning member; 131. fixing column; 132. L-shaped plate; 14. elastic diaphragm; 141. fixing ring; 2. exhaust cylinder; 201. arc guide groove; 21. guide sleeve; 211. spring-shaped guide groove; 22. exhaust sleeve; 221. exhaust hole two; 23. sealing plug disk; 24. guide column; 241. toggle member; 242. guide block. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

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

[0021] See attached Figure 1-7 , an automatic collecting device for spray powder of an offset printing machine, comprising: A collecting box 1, a powder extraction cover 11 is provided on one side of the collecting box 1, and an air extraction pipe 12 extending into the collecting box 1 is provided on the top of the collecting box 1, the powder extraction cover 11 is integrally connected with the collecting box 1 through an air pipe, and air is extracted through the air extraction pipe 12 to cooperate with the powder extraction cover 11 to collect the spray powder, a plurality of cleaning parts 13 that can move toward the axis of the collecting box 1 are movably installed on the collecting box 1, and an elastic diaphragm 14 located at the bottom of the cleaning part 13 is provided in the collecting box 1, and a fixed ring 141 for discharging is provided at the center of the elastic diaphragm 14, and the collected spray powder is discharged through the fixed ring 141 for centralized collection; The vacuum pump 2 is coaxially mounted with a vacuum sleeve 22, and the vacuum sleeve 22 is rotatably connected to the vacuum pipe 12. A dust filter bag is sleeved on the vacuum pump 2, and the vacuum pipe 12 is provided with a vacuum hole 121, and the vacuum sleeve 22 is provided with a vacuum hole 221. The angle between adjacent vacuum holes 121 is a, and the angle between adjacent vacuum holes 221 is b. The vacuum holes 121 and the vacuum holes 221 are staggered, and the angle between adjacent vacuum holes 121 and the vacuum holes 221 is c, the ratio of a:b:c is 2:2:1. In the initial state, the first air extraction hole 121 on the air extraction pipe 12 is misaligned with the second air extraction hole 221 on the air extraction sleeve 22. At this time, the air extraction pipe 12 and the air extraction cylinder 2 are in a sealed state. A guide sleeve 21 is provided at the bottom of the air extraction cylinder 2, and a guide column 24 for guiding the guide sleeve 21 to rotate is slidably installed on the air extraction pipe 12. When the guide column 24 rises to the limit position, the air extraction sleeve 22 is connected with the air extraction pipe 12. A toggle member 241 for toggling the elastic diaphragm 14 is provided at the bottom of the guide column 24. Specifically, a vertical slide groove is provided in the exhaust pipe 12, and a guide piece 122 is provided in the exhaust pipe 12. A sealing plug disc 23 is provided on the top of the guide column 24. When the exhaust pipe 12 is evacuated, the sealing plug disc 23 is first sucked up to rise. When the sealing plug disc 23 reaches the guide piece 122, the exhaust pipe 12 and the powder extraction hood 11 are connected. A guide block 242 is provided on the guide column 24. A spring-shaped guide groove 211 is provided in the guide sleeve 21, and the guide block 242 extends into the spring-shaped guide groove 211. When the sealing plug disc 23 drives the guide column 24 to rise, the guide sleeve 21 and the exhaust cylinder 2 are driven to rotate. In the initial state, the sealing plug disc 23 is in a low position. When exhausting, the sealing plug disc 23 is sucked up and rises to a high position. At this time, the guide block 242 cooperates with the spring-shaped guide groove 211 on the guide sleeve 21 to drive the guide sleeve 21 and the exhaust cylinder 2 to rotate. The rotation angle is the same as c, and then the sealing plug disc 23 is When the disc 23 reaches the high position, it connects the exhaust hole 121 and the exhaust hole 221 to exhaust and absorb the powder. The sealing plug disc 23 is in the shape of an inverted cone, and the guide member 122 is provided with an air inlet groove. Since the sealing plug disc 23 is in the shape of an inverted cone, when the sealing plug disc 23 moves to the high position, the gas can flow out from the air inlet groove. Since a fixed ring 141 for discharging is provided at the center of the elastic diaphragm 14, and the fixed ring 141 is slidably connected to the guide sleeve 21, when the exhaust pipe 12 is evacuated and the powder hood 11 absorbs powder normally, the fixed ring 141 rises with the toggle member 241 and fits with the outer wall of the guide sleeve 21. When the powder absorption work is stopped, the sealing plug disc 23 descends and cooperates with the guide column 24 and the toggle member 241 to pull the fixed ring 141 down. When the sealing plug disc 23 descends to the low position, the elastic diaphragm 14 is toggled into a funnel shape, and the collected powder is discharged and collected at the bottom of the collection box 1.

[0022] In the above technical scheme, the sealing plug disc 23 is sucked up along the inner wall of the exhaust pipe 12 by exhausting air through the exhaust pipe 12. One end of the exhaust pipe 12 is provided with an exhaust device. At the same time, the guide block 242 arranged on the guide column 24 at the bottom of the sealing plug disc 23 cooperates with the spring-shaped guide groove 211 in the guide sleeve 21 to guide the guide sleeve 21 to rotate, thereby driving the exhaust cylinder 2 and the exhaust sleeve 22 to rotate. When the sealing plug disc 23 rises to a high position, it drives the exhaust sleeve 22 to rotate c degrees, so that the exhaust hole 121 and the exhaust hole 221 coincide with each other. At the same time, the sealing plug disc 23 is at the air inlet groove on the guide member 122. The gas is extracted from the bottom and this surface of the exhaust sleeve 22 at the same time, and the external powder is collected into the collection box 1 in cooperation with the powder extraction hood 11. When the sealing plug disc 23 rises to a high position, the toggle piece 241 at the bottom of the guide column 24 pulls the fixing ring 141 up and fits against the outer wall of the guide sleeve 21 to prevent the powder collected at the bottom of the collection box 1 from being extracted. When the extraction work is stopped, the sealing plug disc 23 descends and cooperates with the guide column 24 to squeeze the fixing ring 141 again. At this time, the elastic diaphragm 14 is in a funnel shape to guide the collected powder into the bottom of the collection box 1 for centralized collection. In addition, an opening cover is provided at the bottom of the collection box 1, and the opening cover is used to clean the powder inside the collection box 1.

[0023] The bottom of the vacuum cylinder 2 is provided with an arc-shaped guide groove 201 , and the bottom of the cleaning member 13 is provided with an L-shaped plate 132 extending into the arc-shaped guide groove 201 , which drives the cleaning member 13 to move toward and away from the vacuum cylinder 2 when the vacuum cylinder 2 rotates.

[0024] Specifically, a straight guide groove 101 is provided on the collection box 1, and one end of the straight guide groove 101 is toward the axis of the collection box 1, and the other end is toward the axis away from the collection box 1. A fixed column 131 is provided on the top of the cleaning piece 13, and the fixed column 131 is slidably connected to the collection box 1 and extends into the straight guide groove 101. The straight guide groove 101 is used to guide multiple groups of cleaning pieces 13 to move toward the outer wall of the vacuum cylinder 2.

[0025] Furthermore, the cleaning members 13 are provided in four groups and distributed in a circular array on the collecting box 1 , and the cleaning members 13 are staggered with the air inlet end of the powder extraction cover 11 , and a brush is provided on one side of the cleaning member 13 close to the outer wall of the vacuum cylinder 2 .

[0026] In the above technical scheme, when the exhaust pipe 12 is exhausting air, the guide column 24 cooperates with the guide sleeve 21 to drive the exhaust cylinder 2 to rotate. When the exhaust cylinder 2 rotates, the arc guide groove 201 guides the fixed column 131 to move in the direction away from the exhaust cylinder 2, thereby driving the cleaning piece 13 away from the outer wall of the exhaust cylinder 2 to prevent the cleaning piece 13 from covering the exhaust cylinder 2 and affecting the suction and collection of the spray powder. When the work is stopped, the sealing plug disc 23 descends and cooperates with the guide column 24 and the guide sleeve 21 to make the exhaust cylinder 2 rotate in the opposite direction. At this time, the arc guide groove 201 at the bottom of the exhaust cylinder 2 guides the cleaning piece 13 to move toward the exhaust cylinder 2, and the brush on one side of the cleaning piece 13 contacts the outer wall of the exhaust cylinder 2. At this time, in conjunction with the rotation of the exhaust cylinder 2, the spray powder adsorbed on the surface of the dust filter bag on the outer wall of the exhaust cylinder 2 is cleaned, so as to achieve regular and automatic cleaning and maintain the stability of the equipment's powder collection.

[0027] Working principle: When working, the air is sucked out through the air extraction pipe 12 to suck the sealing plug disc 23 up along the inner wall of the air extraction pipe 12. At this time, the guide block 242 set on the guide column 24 at the bottom of the sealing plug disc 23 cooperates with the spring-shaped guide groove 211 in the guide sleeve 21 to guide the guide sleeve 21 to rotate, thereby driving the air extraction cylinder 2 and the air extraction sleeve 22 to rotate. When the sealing plug disc 23 rises to a high position, it drives the air extraction sleeve 22 to rotate c degrees, so that the air extraction hole 121 and the air extraction hole 221 coincide with each other. At the same time, the sealing plug disc 23 is at the air inlet groove on the guide member 122, and the gas is extracted from the bottom and side of the exhaust sleeve 22 at the same time, and the external spray powder is collected into the collection box 1 in cooperation with the powder extraction cover 11. When the sealing plug disc 23 rises to a high position, the toggle member 241 at the bottom of the guide column 24 pulls the fixing ring 141 up and fits against the outer wall of the guide sleeve 21 to prevent the spray powder collected at the bottom of the collection box 1 from being extracted. When the extraction work is stopped, the sealing plug disc 23 descends and cooperates with the guide column 24 to squeeze the fixing ring again 141, at this time, the elastic diaphragm 14 is in a funnel shape to guide the collected powder into the bottom of the collection box 1 for centralized collection. In addition, an opening cover is provided at the bottom of the collection box 1, and the opening cover is used to clean the powder inside the collection box 1. When the air extraction pipe 12 is evacuated, the guide column 24 cooperates with the guide sleeve 21 to drive the vacuum cylinder 2 to rotate. When the vacuum cylinder 2 rotates, the arc guide groove 201 guides the fixed column 131 to move in a direction away from the vacuum cylinder 2, thereby driving the cleaning member 13 away from the outer wall of the vacuum cylinder 2 to prevent the cleaning member 13 from covering the vacuum cylinder 2. The vacuum cylinder 2 affects the suction and collection of the spray powder. When it stops working, the sealing plug disc 23 descends and cooperates with the guide column 24 and the guide sleeve 21 to make the vacuum cylinder 2 rotate in the opposite direction. At this time, the arc guide groove 201 at the bottom of the vacuum cylinder 2 guides the cleaning piece 13 to move toward the vacuum cylinder 2. The brush on one side of the cleaning piece 13 contacts the outer wall of the vacuum cylinder 2. At this time, in conjunction with the rotation of the vacuum cylinder 2, the spray powder adsorbed on the surface of the dust filter bag on the outer wall of the vacuum cylinder 2 is cleaned, and regular automatic cleaning is achieved to maintain the stability of the equipment's powder suction and collection.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic collection device for offset printing press powder spraying, characterized in that: include: A collecting box (1), wherein a powder extraction cover (11) is provided on one side of the collecting box (1), and an air extraction pipe (12) is provided on the top of the collecting box (1) and extends into the collecting box (1), a plurality of cleaning members (13) are movably mounted on the collecting box (1) and are movable toward the axis of the collecting box (1), and an elastic diaphragm (14) is provided in the collecting box (1) and is located at the bottom of the cleaning members (13); A vacuum cylinder (2), wherein a vacuum sleeve (22) is coaxially mounted on the vacuum cylinder (2), and the vacuum sleeve (22) is rotatably connected to the vacuum pipe (12); a guide sleeve (21) is provided at the bottom of the vacuum cylinder (2), and a guide column (24) is slidably mounted on the vacuum pipe (12) for guiding the guide sleeve (21) to rotate; when the guide column (24) rises to an extreme position, the vacuum sleeve (22) is connected to the vacuum pipe (12), and a toggle member (241) for toggling the elastic diaphragm (14) is provided at the bottom of the guide column (24); The bottom of the vacuum cylinder (2) is provided with an arc-shaped guide groove (201), and the bottom of the cleaning piece (13) is provided with an L-shaped plate (132) extending into the arc-shaped guide groove (201), so that when the vacuum cylinder (2) rotates, the cleaning piece (13) is driven to move towards or away from the vacuum cylinder (2).

2. The automatic collection device for offset printing press powder spraying according to claim 1, characterized in that: The collection box (1) is provided with a straight guide groove (101), one end of the straight guide groove (101) faces the axis of the collection box (1), and the other end faces the axis away from the collection box (1). A fixing column (131) is provided on the top of the cleaning piece (13), and the fixing column (131) is slidably connected to the collection box (1) and extends into the straight guide groove (101).

3. The automatic collection device for offset printing press powder spraying according to claim 1, characterized in that: The cleaning pieces (13) are provided in four groups and are distributed in a circular array on the collection box (1), and the cleaning pieces (13) are staggered with the air inlet end of the powder extraction cover (11). A brush is provided on one side of the cleaning piece (13) close to the outer wall of the air extraction cylinder (2).

4. The automatic collection device for offset printing press powder spraying according to claim 1, characterized in that: A fixed ring (141) for discharging material is provided at the center of the elastic diaphragm (14), and the fixed ring (141) is slidably connected to the guide sleeve (21). When the vacuum pipe (12) is evacuating air and the powder suction cover (11) is sucking powder normally, the fixed ring (141) rises with the toggle member (241) and fits against the outer wall of the guide sleeve (21).

5. The automatic collection device for offset printing press powder spraying according to claim 1, characterized in that: The vacuum cylinder (2) is provided with a dust filter bag, the vacuum pipe (12) is provided with a first vacuum hole (121), and the vacuum sleeve (22) is provided with a second vacuum hole (221).

6. The automatic collection device for offset printing press powder spraying according to claim 5, characterized in that: The angle between adjacent air extraction holes 1 (121) is a, the angle between adjacent air extraction holes 2 (221) is b, the air extraction holes 1 (121) and the air extraction holes 2 (221) are staggered, and the angle between adjacent air extraction holes 1 (121) and the air extraction holes 2 (221) is c, and a:b:c is 2:2:

1.

7. The automatic collection device for offset printing press powder spraying according to claim 1, characterized in that: A vertical slide groove is provided in the exhaust pipe (12), and a guide member (122) is provided in the exhaust pipe (12). A sealing plug disc (23) is provided on the top of the guide column (24). When the exhaust pipe (12) is evacuated, the sealing plug disc (23) is first sucked up and raised. When the sealing plug disc (23) reaches the guide member (122), the exhaust pipe (12) and the powder extraction cover (11) are connected.

8. The automatic collection device for offset printing press powder spraying according to claim 7, characterized in that: A guide block (242) is provided on the guide column (24), a spring-shaped guide groove (211) is provided in the guide sleeve (21), and the guide block (242) extends into the spring-shaped guide groove (211). When the sealing plug disc (23) drives the guide column (24) to rise, the guide sleeve (21) and the vacuum cylinder (2) are driven to rotate.

9. The automatic collection device for offset printing press powder spraying according to claim 8, characterized in that: The sealing plug disc (23) is in the shape of an inverted cone, and an air inlet groove is provided on the guide member (122).

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