Screening and mixing device for dry-mixed mortar

Abstract

The utility model relates to the technical field of mixing of dry-mixed mortar, in particular to a screening and mixing device of dry-mixed mortar, which comprises a barrel body with a U-shaped structure, a stirring shaft rotatably arranged on the barrel body and a driving motor for driving the stirring shaft to rotate, a discharging valve and a dust cover are sequentially arranged below the discharging pipe in the direction away from the barrel, the dust cover is connected with the discharging pipe through the discharging valve, an air pump is arranged on one side of the discharging pipe, the output end of the air pump is communicated with the discharging pipe, a filter is arranged at the input end of the air pump, and the input end of the air pump is communicated with the dust cover through the filter. The utility model provides a screening and mixing device for dry-mixed mortar, which is convenient for mixing dry-mixed mortar raw materials falling into a discharge pipe and reducing the diffusion of discharged dust, and is used for overcoming the defects in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of mixing dry-mix mortar, in particular to a screening and mixing device for dry-mix mortar. Background Art

[0002] Dry-mix mortar is a modern building material that is precisely pre-metered and mixed. Its environmentally friendly properties meet the modern construction industry's demands for high efficiency, environmental friendliness, and consistent quality. Dry-mix mortar is a dry mixture of cement, dry aggregates or powders, various additives, and other components tailored to specific performance requirements. These components are metered and mixed in a specialized production facility according to strict mix ratios. This pre-mixed mortar is transported to the construction site, where construction workers simply add the appropriate amount of water or other supporting components in the prescribed proportions and mix, ready for immediate use. Compared to traditional on-site mortar production methods, dry-mix mortar production is conducted in a fixed facility, making the process more standardized and controllable. This speeds up construction and reduces environmental pollution, such as dust and noise. Furthermore, dry-mix mortar production relies on a comprehensive set of machinery and equipment that ensures uniformity and consistent quality, thus guaranteeing the quality of the final product.

[0003] The production process for dry-mix mortar primarily consists of raw material preparation and transportation, weighing and batching, mixing, and packaging and bulking of the dry-mix mortar. Mixing is particularly critical. Cement, dry aggregate or powder, additives, and other components determined by performance are sequentially added to a cylinder. The dry-mix mortar ingredients in the cylinder are then stirred and mixed by the rotation of the agitator shaft. After mixing is complete, the discharge valve at the bottom of the cylinder is opened, allowing the mixed dry-mix mortar to be discharged through a discharge pipe located below the cylinder for subsequent packaging or bulking. However, in actual production, when the discharge valve is closed, some of the dry-mix mortar ingredients in the cylinder inevitably fall into the closed discharge pipe. Due to the length and structural limitations of the agitator shaft, it is difficult to reach into the discharge pipe for stirring. This makes it difficult to fully mix the dry-mix mortar that falls into the discharge pipe, affecting the uniformity of the dry-mixed sand and thus the quality of the dry-mixed mortar. Furthermore, due to the granular structure of dry-mixed mortar, dust inevitably arises during its discharge through the discharge pipe. This affects the environmental hygiene of the production site and may even pollute the surrounding environment. Therefore, there is significant room for improvement in the mixing process of dry-mixed mortar production. To improve the uniformity of the dry-mixed mortar entering the discharge pipe, the mixing device needs to be modified to effectively handle these difficult-to-mix raw materials. Furthermore, to reduce dust dispersion, the mixing device also needs to be optimized to further improve the efficiency of dry-mixed mortar mixing and enhance the efficiency of the entire production process. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the utility model provides a dry-mixed mortar screening and mixing device which is convenient for mixing dry-mixed mortar raw materials falling into a discharge pipe and reduces the diffusion of discharged dust, thereby overcoming the defects in the prior art.

[0005] The technical solution adopted by the utility model is: a screening and mixing device for dry-mixed mortar, comprising a U-shaped cylinder, a stirring shaft rotatably arranged on the cylinder, and a driving motor for driving the stirring shaft to rotate; a discharge pipe is provided below the cylinder, the discharge pipe is connected to the cylinder, a discharge valve and a dust cover are sequentially provided below the discharge pipe in a direction away from the cylinder, the dust cover is connected to the discharge pipe through the discharge valve, an air pump is provided on one side of the discharge pipe, the output end of the air pump is connected to the discharge pipe, a filter is provided at the input end of the air pump, and the input end of the air pump is connected to the dust cover through the filter.

[0006] Preferably, an air hole is provided on the side wall of the discharge pipe, and the discharge pipe is connected to the air pump through the air hole. A material blocking shell with an open bottom is provided on one side of the air hole, and the material blocking shell is installed on the inner wall of the discharge pipe. The air hole is connected to the discharge pipe through the material blocking shell, and the top of the material blocking shell adopts a semicircular structure.

[0007] Preferably, a fixing plate is provided above the cylinder, the fixing plate is mounted on the middle part of the top end of the cylinder, a feed pipe is inlaid on the fixing plate, the feed pipe and the cylinder are connected, a fixing cylinder with openings at the top and bottom ends is provided above the feed pipe, a sleeve groove is provided on the side wall of the fixing cylinder, a filter plate is movably sleeved in the sleeve groove, the bottom surface of the filter plate contacts the bottom surface of the sleeve groove, a number of filter holes are provided on the filter plate, a fixing ring is provided below the filter plate, the fixing ring is mounted on the inner wall of the fixing cylinder, the top end of the fixing ring contacts the bottom end of the filter plate, and a guide ring is provided above the filter plate The guide ring is installed on the inner wall of the fixed cylinder, the bottom end of the guide ring is in contact with the top of the filter plate, the outer side of the top surface of the guide ring is not lower than the height of the inner side of the top surface of the guide ring, and the inner cavity diameter of the guide ring is not larger than the inner cavity diameter of the fixed ring; the guide ring is provided with a groove on the side close to the sleeve, and a guide plate is provided in the groove, and the guide plate is installed on the top surface of the filter plate, the top of the guide plate is in contact with the top surface of the sleeve, and the two sides of the guide plate are respectively in contact with the guide ring, and the height of the top surface of the guide plate gradually decreases along the direction from the outer side of the guide ring to the inner side of the guide ring.

[0008] Preferably, a limit plate is vertically provided on the side of the filter plate away from the guide ring, one side of the limit plate is installed on the filter plate, and a handle is provided on the other side of the limit plate, and the handle is installed in the middle of the limit plate. The limit plate contacts the outer wall of the fixed cylinder, and a plurality of screws are provided on the outer wall of the fixed cylinder, and the plurality of screws are evenly arranged on the upper and lower sides of the sleeve groove, and one end of the plurality of screws are respectively installed on the outer wall of the fixed cylinder, and a plurality of sleeve holes are opened on the limit plate, and the plurality of sleeve holes are respectively mounted on the plurality of screws. A nut is provided on the side of the limit plate away from the fixed cylinder, and the nut is threadedly mounted on the screw, and the limit plate is fixed to the fixed cylinder by extrusion of the nut.

[0009] Preferably, springs are provided on both sides of the fixed cylinder, brackets are provided on both sides of the spring, the brackets are installed on the outer wall of the fixed cylinder or the top surface of the fixed plate, and a vibration motor is provided on the outside of the fixed cylinder; the upper and middle part of the feed pipe adopts a trumpet-shaped tubular structure, the top diameter of the feed pipe is not less than the middle diameter of the feed pipe, and the diameter of the fixed cylinder is not larger than the top diameter of the feed pipe.

[0010] Preferably, two covers are provided on both sides of the fixed plate, and the two covers are respectively buckled on both sides of the cylinder. One side of the cover is hinged to the top of the cylinder through a hinge, and a cylinder is provided on the outside of the cylinder, and the two sides of the cylinder are respectively hinged to the cover and the cylinder.

[0011] Preferably, air pipes are respectively provided on the side walls of the discharge pipe and the dust cover, one end of the air pipe is installed on the discharge pipe or the dust cover, the discharge pipe is connected to the air pump through the air pipe provided on the side wall of the discharge pipe, and the dust cover is connected to the filter through the air pipe provided on the side wall of the dust cover.

[0012] Preferably, a frame is provided below the cylinder, the cylinder, air pump and driving motor are respectively mounted on the frame, the top end of the discharge pipe is mounted on the cylinder, the bottom end of the discharge pipe, the two ends of the discharge valve and the top end of the dust cover are respectively fixed with flanges, the bottom end of the discharge pipe and the top end of the dust cover are respectively mounted on the two ends of the discharge valve through flanges, the middle and lower part of the dust cover adopts a trumpet-shaped tubular structure, and the bottom end diameter of the dust cover is not less than the middle end diameter of the dust cover.

[0013] The beneficial effects of the present invention are as follows: first, the present invention can stir the dry-mixed mortar raw materials added to the barrel through the provided drive motor and stirring shaft, so that the dry-mixed mortar raw materials added to the barrel are mixed together. And through the provided air pump, the air in the dust cover can be driven to be transported toward the discharge pipe, thereby blowing the dry-mixed mortar raw materials that fall into the discharge pipe toward the barrel to improve the mixing effect of the dry-mixed mortar, and the input air can dry the dry-mixed mortar to improve the drying quality of the dry-mixed mortar. At the same time, the air pump creates a negative pressure environment for the inner cavity of the dust cover to facilitate the suction of dust raised in the dust cover, reduce the diffusion of dust, and thus reduce pollution to the surrounding environment. The dust sucked out of the dust cover and the moisture in the air are filtered through the provided filter to prevent dust and moisture in the air from entering the air pump, thereby reducing the wear of the blades of the air pump, thereby increasing the service life of the air pump 7.

[0014] Secondly, the present invention prevents the dry-mixed mortar from entering the air holes on the discharge pipe by providing a retaining shell, and guides the air delivered by the air pump. When the discharge valve is not opened, the bottom end of the discharge pipe is sealed, and the air discharged by the retaining shell is transported toward the top end of the discharge end, thereby blowing the dry-mixed mortar raw materials that have fallen into the discharge pipe toward the cylinder, thereby improving the mixing effect of the dry-mixed mortar. After the discharge valve is opened, the retaining shell will guide the delivered air toward the discharge valve, thereby pushing the dry-mixed mortar in the discharge valve to be discharged outward, thereby increasing the discharge speed.

[0015] The invention further comprises a filter plate that is provided to fix the feed pipe to the top of the cylinder body, so that the dry-mixed mortar raw materials can be transported into the cylinder body through the feed pipe. The filter plate is provided to screen the dry-mixed mortar raw materials transported into the fixed cylinder to prevent large particles of dry-mixed mortar raw materials from entering the cylinder body. The filter plate is provided to support the filter plate in the fixed cylinder. The guide ring is provided to limit the upper and middle parts of the filter plate to guide the dry-mixed mortar raw materials transported into the fixed cylinder to prevent the dry-mixed mortar raw materials from falling onto the fixed ring. The guide ring is provided with a groove and the guide plate is provided on the filter plate, so that the filter plate can pass through the sleeve groove to facilitate the removal of the filter plate for cleaning. The invention also comprises a vibration motor that drives the fixed cylinder and the filter plate to vibrate to improve the screening efficiency. The spring is used to separate the vibration of the fixed cylinder to prevent the vibration from being transmitted to the fixed plate. The two covers are provided to seal the two sides of the open end of the cylinder respectively. The cylinder is provided to drive the cover to rotate, thereby controlling the opening or closing of the top of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the first stereoscopic schematic diagram of the present utility model.

[0017] Figure 2 for Figure 1 Enlarged schematic diagram of point A in the middle.

[0018] Figure 3 This is a second stereoscopic schematic diagram of the present invention.

[0019] Figure 4 It is a three-dimensional cross-sectional view of the cylinder in the utility model.

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of point B in the middle.

[0021] Figure 6 This is a schematic diagram of the assembly of the fixing plate and the fixing cylinder in the present invention.

[0022] Figure 7 This is an exploded view of the assembly of the fixed cylinder and the filter plate in the present invention. DETAILED DESCRIPTION

[0023] like Figures 1 to 7As shown, a screening and mixing device for dry-mixed mortar includes a U-shaped cylinder 1, a stirring shaft 2 rotatably arranged on the cylinder 1, and a driving motor 3 for driving the stirring shaft 2 to rotate. A discharge pipe 4 is provided below the cylinder 1, and the discharge pipe 4 is connected to the cylinder 1. A discharge valve 5 and a dust cover 6 are sequentially provided below the discharge pipe 4 in a direction away from the cylinder 1. The dust cover 6 is connected to the discharge pipe 4 through the discharge valve 5. An air pump 7 is provided on one side of the discharge pipe 4, and the output end of the air pump 7 is connected to the discharge pipe 4. A filter 8 is provided at the input end of the air pump 7, and the input end of the air pump 7 is connected to the dust cover 6 through the filter 8. By running the air pump 7, the air in the dust cover 6 is driven to be transported toward the discharge pipe 4, thereby blowing the dry-mixed mortar raw materials that fall into the discharge pipe 4 toward the cylinder 1 to improve the mixing effect of the dry-mixed mortar, and the input air can dry the dry-mixed mortar, which can further improve the drying quality of the dry-mixed mortar; and a negative pressure environment is created for the dust cover 6 to facilitate the suction of dust raised in the dust cover 6, thereby reducing pollution to the surrounding environment.

[0024] In this embodiment, an air hole is provided on the side wall of the discharge pipe 4, and the discharge pipe 4 is connected to the air pump 7 through the air hole. A retaining shell 9 with an open bottom is provided on one side of the air hole, and the retaining shell 9 is installed on the inner wall of the discharge pipe 4. The air hole is connected to the discharge pipe 4 through the retaining shell 9, thereby preventing the dry-mixed mortar raw materials from falling into the air hole. The top of the retaining shell 9 adopts a semicircular structure, so that the dry-mixed mortar raw materials falling on the top of the retaining shell 9 can slide down along the top of the retaining shell 9 to facilitate the discharge of the mixed dry-mixed mortar. It should be noted that, since the opening direction of the material-blocking shell 9 is downward, when the discharge valve 5 is not opened, the bottom end of the discharge pipe 4 is sealed, so that the air discharged from the material-blocking shell 9 will be transported toward the top end of the discharge pipe 4; blowing the dry-mixed mortar raw materials falling into the discharge pipe 4 toward the cylinder 1 to improve the mixing effect of the dry-mixed mortar; after opening the discharge valve 5, the material-blocking shell 9 will guide the transported air toward the discharge valve 5, thereby pushing the dry-mixed mortar in the discharge valve 5 to be discharged outward, so as to increase the discharge speed.

[0025] Please refer again Figure 3 、 6and 7. A fixing plate 10 is provided above the cylinder 1, and the fixing plate 10 is mounted on the middle part of the top of the cylinder 1. A feed pipe 11 is inlaid on the fixing plate 10, and the feed pipe 11 is connected to the cylinder 1. A fixing cylinder 12 with openings at both the top and bottom ends is provided above the feed pipe 11. A sleeve groove 13 is provided on the side wall of the fixing cylinder 12, and a filter plate 14 is movably sleeved in the sleeve groove 13. The bottom surface of the filter plate 14 contacts the bottom surface of the sleeve groove 13, and a plurality of filter holes are provided on the filter plate 14. A fixing ring 15 is provided below the filter plate 14, and the fixing ring 15 is mounted on the inner wall of the fixing cylinder 12. The top of the fixing ring 15 contacts the bottom end of the filter plate 14, thereby supporting the filter plate 14. A guide ring 16 is provided above the filter plate 14, and the guide ring 16 is mounted on the inner wall of the fixing cylinder 12, and the bottom end of the guide ring 16 is in contact with the top end of the filter plate 14 The outer side of the top surface of the guide ring 16 is not lower than the height of the inner side of the top surface of the guide ring 16, and the inner cavity diameter of the guide ring 16 is not larger than the inner cavity diameter of the fixing ring 15, so as to guide the dry-mixed mortar raw materials delivered to the fixed cylinder 12, so that the filter plate 14 is used to screen the dry-mixed mortar raw materials delivered to the fixed cylinder 12; the guide ring 16 is provided with a groove on one side close to the sleeve groove 13, and a guide plate 17 is provided in the groove, which is installed on the top surface of the filter plate 14, and the top of the guide plate 17 is in contact with the top surface of the sleeve groove 13, and the two sides of the guide plate 17 are in contact with the guide ring 16 respectively, and the height of the top surface of the guide plate 17 gradually decreases along the direction from the outer side of the guide ring 16 to the inner side of the guide ring 16, and the cross-sectional shape of the guide plate 17 is consistent with the cross-sectional shape of the guide ring 16, so that the filter plate 14 can be removed for cleaning.

[0026] Specifically, a limit plate 18 is vertically provided on one side of the filter plate 14 away from the guide ring 16. One side of the limit plate 18 is mounted on the filter plate 14. A handle 19 is provided on the other side of the limit plate 18. The handle 19 is mounted in the middle of the limit plate 18. Thus, by pulling the handle 19, the filter plate 14 can be pulled out of the fixed cylinder 12 to meet the requirement of taking out the filter plate 14 for cleaning. The limit plate 18 contacts the outer wall of the fixed cylinder 12, and a plurality of screws are provided on the outer wall of the fixed cylinder 12. Rod 20, several screw rods 20 are evenly arranged on the upper and lower sides of the sleeve groove 13, one end of several screw rods 20 are respectively installed on the outer wall of the fixed cylinder 12, and a number of sleeve holes are opened on the limiting plate 18, and several sleeve holes are respectively fitted on several screw rods 20. A nut 21 is provided on the side of the limiting plate 18 away from the fixed cylinder 12, and the nut 21 is threadedly fitted on the screw rod 20. The limiting plate 18 is squeezed and fixed to the fixed cylinder 12 by the nut 21 to meet the assembly requirements of the limiting plate 18 and the filter plate 14.

[0027] In this embodiment, springs 22 are respectively provided on both sides of the fixed cylinder 12, and brackets 23 are respectively provided on both sides of the spring 22. The brackets 23 are installed on the outer wall of the fixed cylinder 12 or the top surface of the fixed plate 10. A vibration motor 24 is provided on the outside of the fixed cylinder 12. By starting the vibration motor 24, the fixed cylinder 12 and the filter plate 14 can be driven to vibrate to speed up the screening efficiency, and the spring 22 is used to separate the vibration of the fixed cylinder 12 to avoid the vibration being transmitted to the fixed plate 10; the upper and middle part of the feed pipe 11 adopts a trumpet-shaped tubular structure, the top diameter of the feed pipe 11 is not less than the middle diameter of the feed pipe 11, and the diameter of the fixed cylinder 12 is not larger than the top diameter of the feed pipe 11, so as to facilitate the reception of the dry mixed mortar raw materials discharged by the fixed cylinder 12.

[0028] Please refer again Figure 3 , covers 25 are respectively provided on both sides of the fixed plate 10, and there are two covers 25. The two covers 25 are respectively covered on both sides of the cylinder 1. One side of the cover 25 is hinged to the top of the cylinder 1 through a hinge. A cylinder 26 is provided on the outside of the cylinder 1, and the two sides of the cylinder 26 are respectively hinged to the cover 25 and the cylinder 1, so that by controlling the extension and contraction amount of the cylinder 26, it is convenient to open or close part of the top of the cylinder 1.

[0029] In this embodiment, an air pipe 27 is respectively provided on the side wall of the discharge pipe 4 and the side wall of the dust cover 6. One end of the air pipe 27 is installed on the discharge pipe 4 or the dust cover 6. The discharge pipe 4 is connected to the air pump 7 through the air pipe 27 provided on the side wall of the discharge pipe 4. The dust cover 6 is connected to the filter 8 through the air pipe 27 provided on the side wall of the dust cover 6, thereby realizing the connection between the air pump 7 and the discharge pipe 4 and the dust cover 6.

[0030] Specifically, a frame 28 is provided below the cylinder 1, and the cylinder 1, the air pump 7 and the drive motor 3 are respectively mounted on the frame 28, thereby supporting the cylinder 1, the air pump 7 and the drive motor 3. It should be noted that the frame 28 is composed of a number of cross bars and vertical bars. The lower middle part of one side of the frame 28 is not equipped with a cross plate to facilitate moving the conveying equipment along one side of the frame 28 to the bottom of the dust cover 6, thereby facilitating the transportation of the mixed dry mortar. The top of the discharge pipe 4 is mounted on the cylinder 1. On the top, the bottom end of the discharge pipe 4, the two ends of the discharge valve 5 and the top of the dust cover 6 are respectively fixed with flanges 29, and the bottom end of the discharge pipe 4 and the top of the dust cover 6 are respectively installed on the two ends of the discharge valve 5 through the flanges 29, so as to facilitate the assembly of the discharge pipe 4, the discharge valve 5 and the dust cover 6. The middle and lower part of the dust cover 6 adopts a trumpet-shaped tubular structure, and the bottom end diameter of the dust cover 6 is not less than the middle end diameter of the dust cover 6, so as to conveniently cover the raised dust to reduce pollution to the surrounding environment.

[0031] The method of using this product is as follows: Figure 1As shown, first, the discharge port of the conveying equipment such as the screw conveyor and the reciprocating elevator needs to be accurately positioned above the fixed barrel 12 so that the dry-mixed mortar raw materials discharged by the conveying equipment can fall into the fixed barrel 12. After the preparations are completed, the vibration motor 24 and the conveying equipment are started to transport the dry-mixed mortar raw materials toward the fixed barrel 12, so that the dry-mixed mortar raw materials fall smoothly onto the filter plate 14. With the help of the vibration work of the vibration motor 24, the filter plate 14 is driven to vibrate to screen the dry-mixed mortar raw materials, so that the screened dry-mixed mortar raw materials fall into the barrel 1 through the feed pipe 11. Next, by starting the drive motor 3 and the air pump 7, the stirring shaft 2 stirs and mixes the dry-mixed mortar in the cylinder 1, and the air in the dust cover 6 is transported toward the discharge pipe 4, and is guided by the retaining shell 9 so that the air discharged from the retaining shell 9 is transported toward the top of the discharge pipe 4. Thus, through the force of the air flow, the dry-mixed mortar raw materials falling into the discharge pipe 4 are blown toward the cylinder 1 to improve the mixing uniformity of the dry-mixed mortar. Finally, after the dry-mixed mortar in the cylinder 1 is mixed, the feed port of the conveying equipment such as the transport vehicle, screw conveyor, and reciprocating elevator is set below the dust cover 6 to facilitate the dry-mixed mortar discharged from the dust cover 6 to fall into the feed port of the conveying equipment. After the preparations are ready, by opening the discharge valve 5, the evenly stirred dry-mixed mortar falls into the feed port of the conveying equipment through the discharge pipe 4. At the same time, by the operation of the air pump 7, the dust raised in the dust cover 6 is sucked into the filter 8 for filtration treatment, ensuring that the dust is effectively controlled and treated.

[0032] Through this embodiment, the dry-mixed mortar raw materials added to the barrel 1 can be stirred by the provided drive motor 3 and the stirring shaft 2, so that the dry-mixed mortar raw materials added to the barrel 1 are mixed together. And through the provided air pump 7, the air in the dust cover 6 can be driven to be transported toward the discharge pipe 4, thereby blowing the dry-mixed mortar raw materials that fall into the discharge pipe 4 toward the barrel 1 to improve the mixing effect of the dry-mixed mortar, and the input air can dry the dry-mixed mortar to improve the drying quality of the dry-mixed mortar. At the same time, the air pump creates a negative pressure environment for the inner cavity of the dust cover 6 to facilitate the suction of the dust raised in the dust cover 6, reduce the diffusion of dust, and thus reduce the pollution of the surrounding environment. The dust sucked out by the dust cover 6 and the moisture in the air are filtered by the provided filter 8 to prevent the dust and moisture in the air from entering the air pump 7, thereby reducing the wear of the blades of the air pump 7, thereby increasing the service life of the air pump 7.

[0033] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A screening and mixing device for dry-mixed mortar, comprising a U-shaped cylinder (1), a stirring shaft (2) rotatably arranged on the cylinder (1), and a driving motor (3) for driving the stirring shaft (2) to rotate, characterized in that: A discharge pipe (4) is provided below the cylinder (1), and the discharge pipe (4) is connected to the cylinder (1). A discharge valve (5) and a dust cover (6) are provided below the discharge pipe (4) in sequence in a direction away from the cylinder (1). The dust cover (6) is connected to the discharge pipe (4) through the discharge valve (5). An air pump (7) is provided on one side of the discharge pipe (4), and the output end of the air pump (7) is connected to the discharge pipe (4). A filter (8) is provided at the input end of the air pump (7), and the input end of the air pump (7) is connected to the dust cover (6) through the filter (8).

2. The screening and mixing device for dry-mix mortar according to claim 1, characterized in that: An air hole is provided on the side wall of the discharge pipe (4), and the discharge pipe (4) is connected to the air pump (7) through the air hole. A blocking shell (9) with an open bottom is provided on one side of the air hole. The blocking shell (9) is installed on the inner wall of the discharge pipe (4). The air hole is connected to the discharge pipe (4) through the blocking shell (9), and the top of the blocking shell (9) adopts a semicircular structure.

3. The screening and mixing device for dry-mix mortar according to claim 1, characterized in that: A fixing plate (10) is provided above the cylinder (1), and the fixing plate (10) is installed at the middle of the top end of the cylinder (1). A feed pipe (11) is embedded on the fixing plate (10), and the feed pipe (11) is connected to the cylinder (1). A fixing cylinder (12) with both the top and bottom ends opened is provided above the feed pipe (11). A sleeve groove (13) is provided on the side wall of the fixing cylinder (12), and a filter plate (14) is movably provided in the sleeve groove (13). The bottom surface of the filter plate (14) contacts the bottom surface of the sleeve groove (13). The filter plate (14) is provided with a plurality of filter holes. A fixing ring (15) is provided below the filter plate (14), and the fixing ring (15) is installed on the inner wall of the fixing cylinder (12). The top end of the fixing ring (15) contacts the bottom end of the filter plate (14). The guide ring (16) is mounted on the inner wall of the fixed cylinder (12), the bottom end of the guide ring (16) contacts the top of the filter plate (14), the outer side of the top surface of the guide ring (16) is not lower than the height of the inner side of the top surface of the guide ring (16), and the inner cavity diameter of the guide ring (16) is not greater than the inner cavity diameter of the fixed ring (15); the guide ring (16) is provided with a groove on one side close to the sleeve groove (13), and a guide plate (17) is provided in the groove. The guide plate (17) is mounted on the top surface of the filter plate (14), the top of the guide plate (17) contacts the top surface of the sleeve groove (13), and both sides of the guide plate (17) contact the guide ring (16). The height of the top surface of the guide plate (17) gradually decreases along the direction from the outer side of the guide ring (16) to the inner side of the guide ring (16).

4. The screening and mixing device for dry-mix mortar according to claim 3, characterized in that: A limit plate (18) is vertically provided on one side of the filter plate (14) away from the guide ring (16). One side of the limit plate (18) is mounted on the filter plate (14). A handle (19) is provided on the other side of the limit plate (18). The handle (19) is mounted in the middle of the limit plate (18). The limit plate (18) contacts the outer wall of the fixed cylinder (12). A plurality of screws (20) are provided on the outer wall of the fixed cylinder (12). The plurality of screws (20) are evenly arranged. On the upper and lower sides of the sleeve groove (13), one end of a plurality of screw rods (20) is respectively mounted on the outer wall of the fixed cylinder (12), a plurality of sleeve holes are opened on the limiting plate (18), and the plurality of sleeve holes are respectively sleeved on the plurality of screw rods (20), and a nut (21) is provided on the side of the limiting plate (18) away from the fixed cylinder (12), and the nut (21) is threadedly sleeved on the screw rod (20), and the limiting plate (18) is squeezed and fixed on the fixed cylinder (12) by the nut (21).

5. The screening and mixing device for dry-mix mortar according to claim 3, characterized in that: Springs (22) are provided on both sides of the fixed cylinder (12), brackets (23) are provided on both sides of the spring (22), and the brackets (23) are installed on the outer wall of the fixed cylinder (12) or the top surface of the fixed plate (10). A vibration motor (24) is provided on the outside of the fixed cylinder (12); the middle and upper part of the feed pipe (11) adopts a trumpet-shaped tubular structure, the top diameter of the feed pipe (11) is not less than the middle diameter of the feed pipe (11), and the diameter of the fixed cylinder (12) is not greater than the top diameter of the feed pipe (11).

6. The screening and mixing device for dry-mix mortar according to claim 3, characterized in that: The fixing plate (10) is provided with a cover (25) on both sides, and the number of the cover (25) is two. The two covers (25) are respectively buckled on both sides of the cylinder (1). One side of the cover (25) is hinged to the top of the cylinder (1) through a hinge. The cylinder (26) is provided on the outside of the cylinder (1), and the two sides of the cylinder (26) are respectively hinged to the cover (25) and the cylinder (1).

7. The screening and mixing device for dry-mix mortar according to claim 1, characterized in that: An air pipe (27) is provided on the side wall of the discharge pipe (4) and the side wall of the dust cover (6), respectively. One end of the air pipe (27) is mounted on the discharge pipe (4) or the dust cover (6). The discharge pipe (4) is connected to the air pump (7) via the air pipe (27) provided on the side wall of the discharge pipe (4). The dust cover (6) is connected to the filter (8) via the air pipe (27) provided on the side wall of the dust cover (6).

8. The screening and mixing device for dry-mix mortar according to claim 1, characterized in that: A frame (28) is provided below the cylinder (1), the cylinder (1), the air pump (7) and the drive motor (3) are respectively mounted on the frame (28), the top end of the discharge pipe (4) is mounted on the cylinder (1), the bottom end of the discharge pipe (4), the two ends of the discharge valve (5) and the top end of the dust cover (6) are respectively fixedly sleeved with flanges (29), the bottom end of the discharge pipe (4) and the top end of the dust cover (6) are respectively mounted on the two ends of the discharge valve (5) through the flanges (29), the middle and lower part of the dust cover (6) adopts a trumpet-shaped tubular structure, and the bottom end diameter of the dust cover (6) is not less than the middle end diameter of the dust cover (6).

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