An automatically adjustable dust collection and return device

Abstract

This invention relates to auxiliary equipment for powder material packaging and the field of industrial environmental dust removal technology, specifically an automatically adjustable dust collection and recovery device. The device includes a support frame with a discharge pipe fixedly connected to it. A vacuum cleaner is mounted on the discharge pipe, and the vacuum cleaner's suction pipe extends from inside the discharge pipe to the outside and is fixedly connected to a suction port. An auxiliary movable dust collection mechanism is installed on the outer wall of the suction port. This automatically adjustable dust collection and recovery device, through the matching arrangement of the collection frame and the spray head, guides the powder backflow from the bag opening during the powder filling process using an arc plate, and pre-collects the backflowed powder in conjunction with the dust suction machine, reducing powder escape at the source. After filling, the vacuum cleaner, in conjunction with the movable suction port, thoroughly vacuums the residual powder in the work area. The recovered powder is stored uniformly in the discharge pipe for centralized recycling and reuse, achieving a closed-loop recycling process for powder materials.

Description

Technical Field

[0001] This invention relates to auxiliary equipment for powder material packaging and the field of industrial environmental dust removal technology, specifically an automatically adjustable dust collection and return device. Background Technology

[0002] In many industrial production fields such as chemicals, building materials, grain processing, and pharmaceuticals, quantitative filling and packaging of powder materials is one of the core processes in finished product production. Currently, the industry commonly uses spray nozzles in conjunction with packaging bags for powder filling operations. In actual production, the high-speed filling of powder into the packaging bag causes a sudden increase in air pressure inside the bag, which can easily lead to a large amount of powder being blown away from the bag opening. Especially at the moment when the filling is completed and the packaging bag is detached from the spray nozzle, the escape of residual powder from the bag opening is even more serious, becoming an industry pain point that is difficult to eradicate in the powder packaging process.

[0003] The aforementioned powder dispersion issues, on the one hand, cause a significant waste of finished materials, substantially increasing production losses and operating costs for enterprises, and making it impossible to achieve efficient material recovery and recycling; on the other hand, the dispersed powder dust will continuously pollute the workshop production environment, and long-term suspended inhalable dust will cause irreversible damage to the respiratory system of on-site operators, posing serious occupational health and safety hazards; and for powder materials with flammable and explosive properties such as starch, sulfur, and resin powder, there is also a significant safety risk of dust explosion once the suspended dust reaches the explosion limit concentration, which does not meet the relevant safety production standards.

[0004] To address the issue of dust emission during powder filling, the industry conventionally employs stationary dust collection devices for dust control. However, existing dust collection devices suffer from numerous intractable technical drawbacks: Firstly, most existing vacuuming devices use fixed-point vacuum port designs, which have limited vacuum coverage and cannot thoroughly vacuum the dust-spreading areas of the packaging station. This results in a large number of vacuuming blind spots, low dust collection efficiency, and an inability to completely remove scattered dust. Secondly, the suction range, opening size and suction power of the existing device's suction port cannot be dynamically and automatically adjusted. It cannot match the corresponding suction parameters at different stages of the suction operation. Especially at the end of the suction operation, it cannot increase the suction power by reducing the flow area of ​​the suction port, which makes it difficult to completely remove fine residual dust. Third, existing dust collection devices can only achieve passive dust collection after filling. They lack a pre-powder guiding and pre-collection structure during the filling process, making it impossible to intercept and collect the powder blown back during filling. This results in a large amount of powder directly escaping into the work space, significantly increasing the load on subsequent dust collection operations and greatly reducing the dust collection effect. Fourth, the existing portable vacuum cleaners have complex drive structures, making it impossible to achieve the combined linkage of horizontal movement and vertical lifting of the vacuum port through a single drive component. This makes it difficult to compress the vacuuming work space simultaneously during the vacuuming process, thus failing to further enhance the vacuuming effect. Furthermore, they have poor stability during operation and are prone to jamming. Fifth, after long-term use, existing equipment is prone to powder accumulation and adhesion problems on the suction port and moving parts. Without a matching automatic cleaning structure, long-term material accumulation will lead to blockage of the suction pipe, equipment malfunction, significantly shorten the service life of the equipment, and increase manual maintenance costs.

[0005] Therefore, developing a dust collection and return device that can achieve pre-collection of powder, dynamic adjustment of suction range and suction power, comprehensive dust collection without dead angles, strong structural linkage, and automatic material cleaning has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide an automatically adjustable dust collection and return device to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: an automatically adjustable dust collection and return device, including a support frame, a discharge pipe fixedly connected to the support frame, a vacuum cleaner installed on the discharge pipe, and a suction pipe of the vacuum cleaner extending from inside the discharge pipe to the outside of the discharge pipe and fixedly connected to a suction pipe opening; An auxiliary moving dust collection mechanism is installed on the outer wall of the suction pipe opening. The auxiliary moving dust collection mechanism is fixedly installed on the unloading pipe and is used to drive the suction pipe opening to make a compound linkage movement of horizontal backward movement and vertical upward movement, so as to simultaneously compress the suction operation space and realize the automatic adjustment of the suction coverage area. A movable frame is fixedly connected to the air intake end of the suction pipe. Sliding sleeves are slidably fitted on both sides of the movable frame. A cover plate is hinged to the end of the two sliding sleeves. The end of the cover plate is connected to the fixed collection frame through an L-shaped connecting plate. The movable frame, sliding sleeves, cover plate and L-shaped connecting plate together constitute a linkage adjustment mechanism, which is used to gradually reduce the flow area of ​​the suction pipe as the suction pipe moves backward with the auxiliary moving dust collection mechanism to dynamically improve the suction power, and at the same time complete the automatic pushing and cleaning of the material on the surface of the movable frame. A sprayer is fixedly installed on the back of the collection frame. The sprayer is fixedly installed on the top of the unloading pipe, and the spray head of the sprayer is installed through the collection frame.

[0007] Preferably, the inner wall of the collection frame is provided with an arc plate and a powder suction machine, and the dust suction port of the powder suction machine faces the inner side of the arc plate, which is used to guide and pre-collect the powder that escapes from the bag opening during the powder filling process. An electromechanical clamp is also installed on the collection frame, and the electromechanical clamp is located on the outside of the nozzle. An auxiliary frame is fixedly installed on the outside of the collection frame, and an electric lifting door is installed at the front end of the auxiliary frame.

[0008] Preferably, the auxiliary mobile dust collection mechanism includes a cylinder, which is fixedly installed on the unloading pipe. A moving plate is sleeved on the outer side of the inner rod of the cylinder. A damping spring telescopic rod is fixedly connected to the side of the moving plate facing the unloading pipe. The end of the damping spring telescopic rod away from the moving plate is fixedly connected to the unloading pipe to provide moving damping and restoring elasticity for the moving plate, thereby ensuring the stability of the compound linkage motion. The movable plate is fixedly connected to two opposing guide plates on the side facing away from the unloading pipe. Each guide plate has a guide groove, which consists of two horizontal grooves that are staggered vertically and an oblique groove. The oblique groove connects the two horizontal grooves and is used to convert the horizontal driving force of the cylinder into a vertical lifting force through the limiting sliding of the slider, thereby realizing multi-dimensional displacement adjustment of the suction pipe opening. Z-shaped plates are slidably provided on opposite sides of the two guide plates, and sliders are fixedly connected to the rear ends of the two Z-shaped plates. The Z-shaped plates are slidably assembled into the guide grooves by the sliders. A sliding plate is fixedly connected to the end of the Z-shaped plate away from the slider. Limiting grooves are opened on both the left and right sides of the sliding plate. Limiting slide plates are slidably connected in the limiting grooves of the sliding plate. A fixing plate is fixedly connected to the back of the two limiting slide plates. The fixing plate is fixedly installed on the end of the cylinder inner rod. A connecting frame is fixedly connected to the front side of the sliding plate. The connecting frame is fixedly installed on the outer wall of the suction pipe opening and is used to synchronously transmit the compound linkage motion of the sliding plate to the suction pipe opening.

[0009] Preferably, a sealing plate is provided at the lower end of the unloading pipe.

[0010] Preferably, the cover plate has an inverted U-shaped structure, and a scraper is fixedly installed on the inner wall of the cover plate.

[0011] Preferably, the suction pipe opening is tilted forward.

[0012] Preferably, the vertical end of the L-shaped connecting plate has a sleeve hole that matches the protrusion at the end of the cover plate. The L-shaped connecting plate is fitted onto the protrusion of the cover plate through the sleeve hole, and the horizontal plate of the L-shaped connecting plate is fixedly connected to the outer wall of the collection frame.

[0013] Preferably, the arc plate is fixedly disposed on the right side of the inner wall of the collection frame, and the powder suction machine is fixedly disposed on the left side of the inner wall of the collection frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention achieves dust interception and closed-loop recycling throughout the entire filling process, significantly reducing material loss and safety and environmental risks. By using a collection frame and a matching spray head, during powder filling, an arc plate directs the flow of powder blown back from the bag opening, while a powder suction machine pre-collects the back-blown powder, reducing powder escape at the source. After filling, a vacuum cleaner with a movable suction nozzle thoroughly vacuums up any remaining powder in the work area. The recovered powder is stored in a discharge pipe for centralized recycling and reuse, achieving a closed-loop recycling of powder materials throughout the entire process. This design significantly reduces material loss, completely avoids workshop environmental pollution and occupational health and safety hazards caused by powder escape, and mitigates the explosion risk of flammable and explosive powders, fully complying with safety production and environmental management regulations.

[0015] This invention utilizes a single-drive mechanism to achieve compound, coordinated motion of the suction port, eliminating blind spots and significantly improving dust collection efficiency. Through a specially designed auxiliary moving dust collection mechanism, a single cylinder serves as the driving component. This, combined with a guide groove structure on the guide plate composed of horizontal and inclined grooves, allows the suction port to move horizontally backward while simultaneously moving vertically upward through the limiting action of the slider and the guide groove. This gradually compresses the enclosed dust collection space during the suction process, enabling the suction port to provide comprehensive, front-to-back and bottom-to-top coverage of the entire working area within the auxiliary frame. This completely eliminates blind spots inherent in traditional fixed suction ports, significantly improving the comprehensiveness and efficiency of dust collection. Furthermore, the single-drive component enables multi-dimensional compound motion, greatly simplifying the equipment structure, improving operational stability, and reducing the failure rate and maintenance costs.

[0016] This invention achieves dynamic and automatic adjustment of the suction port's flow area and suction power, enhancing the suction effect at the end of the suction process. Through a coordinated structure of a moving frame, sliding sleeve, and cover plate, the cover plate deflects and slides along with the moving frame as the suction port moves backward and upward, gradually covering the frame horizontally. This causes the suction port's flow area to gradually decrease as the suction progresses, automatically increasing suction power at the end of the suction process. This powerfully removes fine residual powder from the workspace, completely solving the problems of insufficient suction and difficulty in removing fine dust at the end of traditional devices. It achieves adaptive parameter matching throughout the entire suction process, further improving the thoroughness of powder collection.

[0017] This invention features an online automatic material cleaning function, preventing material accumulation and blockage, and extending equipment lifespan. During the cover plate's deflection and covering process, the L-shaped connecting plate, in conjunction with the cover plate, passively pushes residual powder accumulated on the moving frame forward into the suction pipe during the backward movement of the moving frame. Combined with a scraper on the inner wall of the cover plate, it simultaneously scrapes and cleans the powder adhering to the moving frame and the inner wall of the suction pipe, achieving online automatic material cleaning during dust collection. This completely solves the industry pain point of powder accumulation and pipe blockage after long-term use of traditional devices, significantly reducing the frequency of manual cleaning and maintenance, and effectively extending the equipment's lifespan. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the auxiliary frame and electric lifting door of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the collection frame of the present invention; Figure 5 This is a three-dimensional structural diagram of the limiting slide plate and fixing plate of the present invention; Figure 6 This is a three-dimensional structural diagram of the damping spring telescopic rod and guide plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the spraying machine and spraying head of the present invention; Figure 8 This is a three-dimensional structural diagram of the sliding plate and the limiting slide plate of the present invention.

[0019] In the diagram: 1. Support frame; 2. Unloading pipe; 3. Vacuum cleaner; 4. Vacuum nozzle; 5. Moving frame; 6. Sliding sleeve; 7. Cover plate; 8. L-shaped connecting plate; 9. Collection frame; 91. Arc plate; 92. Powder suction machine; 93. Electromechanical clamping plate; 94. Auxiliary frame; 95. Electric lifting door; 10. Spraying machine; 11. Spraying head; 12. Cylinder; 121. Moving plate; 122. Damping spring telescopic rod; 123. Guide plate; 124. Guide groove; 125. Z-shaped plate; 126. Slider; 127. Sliding plate; 128. Limiting slide plate; 129. Fixing plate; 1210. Connecting frame; 13. Sealing plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 8 The present invention provides a technical solution: an automatically adjustable dust collection and return device, including a bracket 1, a discharge pipe 2 fixedly connected to the bracket 1, a vacuum cleaner 3 installed on the discharge pipe 2, and the vacuum cleaner 3's suction pipe extends from inside the discharge pipe 2 to the outside of the discharge pipe 2 and is fixedly connected to a suction pipe port 4. An auxiliary moving dust collection mechanism is installed on the outer wall of the suction pipe port 4, and the auxiliary moving dust collection mechanism is installed on the discharge pipe 2. A movable frame 5 is fixedly connected to the air intake end of the suction pipe 4. Sliding sleeves 6 are provided on both sides of the movable frame 5 for limiting sliding. A cover plate 7 is hinged to the end of the two sliding sleeves 6. The cover plate 7 is inverted U-shaped. The sliding sleeves 6 ensure the stability of the cover plate 7 sliding on the movable frame 5. An L-shaped connecting plate 8 is movably fitted on the protrusions on both sides of one end of the cover plate 7. A collection frame 9 is fixedly connected to the horizontal plate of the two L-shaped connecting plates 8. A sprayer 10 is installed on the back of the collection frame 9. The sprayer 10 is installed on the top of the discharge pipe 2. The spray head 11 of the sprayer 10 passes through the collection frame 9. An arc plate 91 is provided on the right side of the inner wall of the collection frame 9, and a powder suction machine 92 is provided on the left side of the inner wall of the collection frame 9. The dust suction port of the powder suction machine 92 faces the inside of the arc plate 91, which facilitates the collection of powder guided by the arc plate 91. An electric mechanical clamp 93 is also installed on the collection frame 9. The electric mechanical clamp 93 is located outside the spray head 11. The packaging bag on the spray head 11 is fixed by the electric mechanical clamp 93.

[0022] An auxiliary frame 94 is also installed on the outside of the collection frame 9, and an electric lifting door 95 is installed at the front end of the auxiliary frame 94.

[0023] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the auxiliary mobile dust collection mechanism includes a cylinder 12, which is installed on the unloading pipe 2. A moving plate 121 is sleeved on the outer side of the inner rod of the cylinder 12. A damping spring telescopic rod 122 is fixedly connected to the side of the moving plate 121 facing the unloading pipe 2. The end of the damping spring telescopic rod 122 away from the moving plate 121 is fixed on the unloading pipe 2. Two guide plates 123 are fixedly connected to the side of the movable plate 121 facing away from the unloading pipe 2. Each guide plate 123 has a guide groove 124. The guide groove 124 consists of two horizontal grooves and an inclined groove that are staggered vertically. The inclined groove is located in the middle and connects and communicates with the two horizontal grooves. Z-shaped plates 125 are slidably arranged on opposite sides of the two guide plates 123. Slider 126 is fixedly connected to the rear end of each of the two Z-shaped plates 125, and the Z-shaped plates 125 are slidably arranged in the guide groove 124 through the slider 126. A sliding plate 127 is fixedly connected to the end of the Z-shaped plate 125 away from the slider 126. Limiting grooves are provided on both the left and right sides of the sliding plate 127. Limiting slide plates 128 are slidably connected in the limiting grooves of the sliding plate 127. A fixing plate 129 is fixedly connected to the back of the two limiting slide plates 128, and the fixing plate 129 is fixed to one end of the inner rod of the cylinder 12. A connecting bracket 1210 is fixedly connected to the front side of the sliding plate 127, and the connecting bracket 1210 is fixedly installed on the outer wall of the suction pipe port 4.

[0024] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a sealing plate 13 is provided at the lower end of the unloading pipe 2.

[0025] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the electric lifting door 95 consists of an electric telescopic rod and a cover door. The cover door is slidably mounted on the front side of the inner wall of the auxiliary frame 94. The electric telescopic rod is fixedly connected to the side of the cover door, and the end of the electric telescopic rod away from the cover door is fixed to the inner wall of the auxiliary frame 94.

[0026] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a vertical groove is provided on the side of the collection frame 9, and the protrusions on both sides of one end of the L-shaped connecting plate 8 can slide within the vertical groove of the collection frame 9.

[0027] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the suction pipe 4 is tilted forward.

[0028] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a scraper is installed on the inner wall of the cover plate 7.

[0029] The method of use and advantages of the present invention: The working process of this automatically adjustable dust collection and return device is as follows: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, when the device is in use, the electric lifting door 95 is opened, the packaging bag is put on the spray head 11, and then the packaging bag on the spray head 11 is fixed by the electric mechanical clamp 93. The powder is conveyed into the packaging bag by the spray machine 10. At this time, part of the powder sprayed out of the packaging bag mouth is blown back from the packaging bag mouth to the collection frame 9. At this time, the arc plate 91 in the collection frame 9 guides the powder blown into it to the left, and the powder suction machine 92 collects the powder inside. After the packaging bag is filled with powder, the electric mechanical clamp 93 opens and removes the packaging bag from the spray head 11. At this time, the electric lifting door 95 closes and the vacuum cleaner 3 is started to suck up the powder in the auxiliary frame 94 with the vacuum pipe 4. Then, the cylinder 12 and the fixed plate 129 drive the sliding plate 127 on the inner side of the two limit slide plates 128 to pull the connecting frame 1210 backward, causing the vacuum pipe 4 and the moving frame 5 on the connecting frame 1210 to move backward at the same time. At this time, since the suction port of the vacuum pipe 4 is set at an angle, the suction port of the vacuum pipe 4 moves from the lower front side of the auxiliary frame 94 to the rear to suck up the powder in the auxiliary frame 94. Furthermore, when the cylinder 12 retracts and drives the sliding plate 127 and the connecting frame 1210 to move backward simultaneously, the Z-shaped plate 125 on the sliding plate 127 slides backward and tilts upward in the guide groove 124, causing the dust suction port 4 and the moving frame 5 on the connecting frame 1210 to move upward during the backward movement, compressing the space inside the auxiliary frame 94, which facilitates the comprehensive dust suction of the powder inside the auxiliary frame 94 and collection into the unloading pipe 2; As the moving frame 5 moves backward and upward, the cover plate 7 deflects, causing the L-shaped connecting plate 8 to abut against the inside of the moving frame 5. As the moving frame 5 continues to move backward, the L-shaped connecting plate 8 passively pushes the powder on the moving frame 5 forward into the suction pipe 4, thus better collecting the powder on the moving frame 5. As the cover plate 7 gradually covers the moving frame 5 horizontally, the suction port of the suction pipe 4 gradually narrows, thereby increasing the suction power of the suction pipe 4, thus better vacuuming the last space inside the auxiliary frame 94, completing the collection of powder. The collected powder is stored in the discharge pipe 2, and the user can collect and recycle the powder stored in the discharge pipe 2 by opening the sealing plate 13.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatically adjustable dust collection and return device, comprising a support (1), wherein a discharge pipe (2) is fixedly connected to the support (1), and a vacuum cleaner (3) is provided on the discharge pipe (2), wherein the suction pipe of the vacuum cleaner (3) extends from inside the discharge pipe (2) to the outside of the discharge pipe (2) and is fixedly connected to a suction pipe opening (4), characterized in that: An auxiliary moving dust collection mechanism is installed on the outer wall of the suction pipe (4). The auxiliary moving dust collection mechanism is fixedly installed on the unloading pipe (2) and is used to drive the suction pipe (4) to make a compound linkage movement of horizontal backward movement and vertical upward movement, synchronously compressing the suction operation space and realizing automatic adjustment of the suction coverage area. The suction port end of the suction pipe (4) is fixedly connected to a movable frame (5). The movable frame (5) is slidably fitted with sliding sleeves (6) on both sides. The ends of the two sliding sleeves (6) are hinged with cover plates (7). The ends of the cover plates (7) are connected to the fixedly installed collection frame (9) through an L-shaped connecting plate (8). The movable frame (5), sliding sleeves (6), cover plates (7) and L-shaped connecting plate (8) together constitute a linkage adjustment mechanism, which is used to gradually reduce the flow area of ​​the suction pipe (4) to dynamically improve the suction power as the suction pipe (4) moves backward with the auxiliary moving dust collection mechanism, and at the same time complete the automatic pushing and cleaning of the material on the surface of the movable frame (5). A sprayer (10) is fixedly installed on the back of the collection frame (9). The sprayer (10) is fixedly installed on the top of the unloading pipe (2). The spray head (11) of the sprayer (10) is installed through the collection frame (9).

2. The automatically adjustable dust collection and return device according to claim 1, characterized in that: The inner wall of the collection frame (9) is provided with an arc plate (91) and a powder suction machine (92). The dust suction port of the powder suction machine (92) faces the inner side of the arc plate (91) and is used to guide the powder that is blown away from the bag opening and pre-collect it during the powder filling process. An electromechanical clamp (93) is also installed on the collection frame (9), and the electromechanical clamp (93) is located on the outside of the nozzle (11); An auxiliary frame (94) is fixedly installed on the outside of the collection frame (9), and an electric lifting door (95) is installed at the front end of the auxiliary frame (94).

3. The automatically adjustable dust collection and return device according to claim 2, characterized in that: The auxiliary mobile dust collection mechanism includes a cylinder (12), which is fixedly installed on the unloading pipe (2). A moving plate (121) is sleeved on the outer side of the inner rod of the cylinder (12). A damping spring telescopic rod (122) is fixedly connected to the side of the moving plate (121) facing the unloading pipe (2). The end of the damping spring telescopic rod (122) away from the moving plate (121) is fixedly connected to the unloading pipe (2) to provide moving damping and reset elasticity for the moving plate (121) and ensure the stability of the compound linkage motion. The movable plate (121) is fixedly connected to two opposing guide plates (123) on the side facing away from the unloading pipe (2). Both guide plates (123) are provided with guide grooves (124). The guide grooves (124) are composed of two horizontal grooves and one inclined groove that are staggered vertically. The inclined groove connects the two horizontal grooves and is used to convert the horizontal driving force of the cylinder (12) into the vertical lifting force through the limiting sliding of the slider (126), so as to realize the multi-dimensional displacement adjustment of the suction pipe (4). Z-shaped plates (125) are slidably provided on opposite sides of the two guide plates (123), and sliders (126) are fixedly connected to the rear ends of the two Z-shaped plates (125). The Z-shaped plates (125) are slidably assembled in the guide groove (124) through the sliders (126). A sliding plate (127) is fixedly connected to one end of the Z-shaped plate (125) away from the slider (126). Limiting grooves are provided on both the left and right sides of the sliding plate (127). Limiting slide plates (128) are slidably connected in the limiting grooves of the sliding plate (127). A fixing plate (129) is fixedly connected to the back of the two limiting slide plates (128). The fixing plate (129) is fixedly installed at the end of the inner rod of the cylinder (12). A connecting frame (1210) is fixedly connected to the front side of the sliding plate (127). The connecting frame (1210) is fixedly installed on the outer wall of the suction pipe (4) to synchronously transmit the compound linkage motion of the sliding plate (127) to the suction pipe (4).

4. The automatically adjustable dust collection and return device according to claim 1, characterized in that: A sealing plate (13) is provided at the lower end of the unloading pipe (2).

5. The automatically adjustable dust collection and return device according to claim 1, characterized in that: The cover plate (7) has an inverted U-shaped structure, and a scraper is fixedly installed on the inner wall of the cover plate (7).

6. The automatically adjustable dust collection and return device according to claim 1, characterized in that: The suction pipe (4) is tilted forward.

7. The automatically adjustable dust collection and return device according to claim 1, characterized in that: The vertical end of the L-shaped connecting plate (8) is provided with a sleeve hole that matches the protrusion at the end of the cover plate (7). The L-shaped connecting plate (8) is sleeved on the protrusion of the cover plate (7) through the sleeve hole. The horizontal plate of the L-shaped connecting plate (8) is fixedly connected to the outer wall of the collection frame (9).

8. The automatically adjustable dust collection and return device according to claim 2, characterized in that: The arc plate (91) is fixedly installed on the right side of the inner wall of the collection frame (9), and the powder suction machine (92) is fixedly installed on the left side of the inner wall of the collection frame (9).

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