Dust recycling device for concrete production

Abstract

The application relates to the field of solid waste pollution treatment, and discloses a dust recycling device for concrete production, which comprises a separation box and a collection box, an air outlet pipe is communicated and installed at the top of the separation box, and an air inlet mechanism is further arranged, which comprises a communicating pipe one, a fan and a communicating pipe two, the communicating pipe one and the fan are fixedly communicated with the outer surface of the separation box, the communicating pipe one and the communicating pipe two are communicated through bolts, the air outlet end of the fan is fixedly connected with the communicating pipe two, the air inlet end of the fan is fixedly communicated with a communicating pipe three, and a dust collection cover is communicated and installed at the bottom end of the communicating pipe three. The device is redesigned, the dust filtering efficiency and reliability of dust-containing air are greatly improved, the cyclone separator and the cloth bag separator are combined, the dust removal efficiency can be remarkably improved, the automatic cleaning of the dust removal component is realized, and the reliability of the device is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of solid waste pollution treatment technology, and in particular to a dust recycling device for concrete production. Background Technology

[0002] Concrete is typically produced by mixing aggregates and powders in a concrete mixing plant. During the supply process, these aggregates and powders diffuse out of the mixing equipment's inlet. Although dust curtains are installed at the inlet of the weighing tank to suppress dust diffusion, this cannot be completely prevented. With the continuous transport of aggregates and powders, a large amount of dust spreads, leading to solid waste pollution, air pollution, and other serious environmental damage. Therefore, existing technologies absorb, treat, and recycle the large amount of dust generated during concrete production, primarily using physical filtration components (such as filter bags and screens) and cyclone separators (which utilize tangential airflow to generate vortices and centrifugal force, thus throwing off solid impurities and causing them to move downwards along the inner wall of the device). However, physical filtration components often become clogged and require cleaning and replacement when subjected to heavy filtration work, while cyclone separators cannot filter dust as finely as physical filtration components. Therefore, this application aims to combine the above two filtration methods to design a dust recycling device for concrete production. Summary of the Invention

[0003] This application proposes a dust recycling device for concrete production, which has the advantages of high dust removal efficiency and high reliability, and solves the problem of low efficiency and reliability caused by the single dust removal method in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solution: a dust recycling device for concrete production, comprising a separation box and a collection box, wherein an air outlet pipe is connected to the top of the separation box, and further comprising:

[0005] The air intake mechanism includes a connecting pipe 1, a fan, and a connecting pipe 2. The connecting pipe 1 and the fan are fixedly connected to the outer surface of the separation box. The connecting pipe 1 and the connecting pipe 2 are connected by bolts. The air outlet of the fan is fixedly connected to the connecting pipe 2. The air inlet of the fan is fixedly connected to the connecting pipe 3. The bottom end of the connecting pipe 3 is connected to and installed with a dust collection hood.

[0006] The outer ring dust removal mechanism includes an inner dust removal cylinder located in the inner cavity of the separation box and multiple sets of support plates fixedly connected to the top of the inner wall of the separation box. Multiple sets of connecting blocks are fixedly connected to the outer surface of the inner dust removal cylinder. Springs are elastically connected between the connecting blocks and the support plates. A fixture is fixedly connected to the bottom of the inner wall of the separation box. A filter cylinder is fixedly connected between the inner dust removal cylinder and the fixture.

[0007] The inner ring dust removal mechanism includes a fixed ring and a filter bag located in the inner cavity of the inner dust removal cylinder. A support ring is fixedly installed on the top of the inner wall of the separation box, and the fixed ring is rotatably installed in the support ring.

[0008] Preferably, the collection box is fixedly connected to the bottom end of the separation box, and a receiving door is installed on the front of the collection box.

[0009] Preferably, a motor is installed on the top of the separation box, located on the right side of the air outlet pipe. The output shaft of the motor is fixedly installed with a vibrating wheel located in the inner cavity of the separation box. The outer surface of the vibrating wheel is provided with a protrusion. A limit ring is fixedly connected to the bottom of the support ring. The outer surface of the vibrating wheel abuts against the limit ring. A spring is movably sleeved inside the limit ring. The inner and outer rings of the spring abut against the fixed ring and the limit ring, respectively.

[0010] Preferably, the top view cross-section of the spring is a spiral shape, the bottom of the fixing ring is provided with a slot, and the top of the filter bag is fixedly connected to the inside of the slot.

[0011] Preferably, the axial cross-sectional shape of the support ring and the limiting ring is "L" shaped, and the inner ring size of the support ring is larger than the inner ring size of the fixed ring, so that the fixed ring can move horizontally along the inner wall of the support ring.

[0012] Preferably, the shape and size of the inner dust collector are adapted to the shape and size of the separation box, and the inner dust collector is made of stainless steel.

[0013] Preferably, the inner dust collector has a central groove inside, and the top of the inner wall of the inner dust collector has multiple sets of air inlet grooves that communicate with the central groove.

[0014] Preferably, multiple sets of the air inlet slots are equidistantly distributed along the axis of the inner dust collector at the top of the inner wall of the inner dust collector, and each set of the air inlet slots consists of four slots, which are equidistantly distributed in a circle.

[0015] Preferably, the filter cartridge and the filter bag are made of the same material, and the bottom of the intermediate groove is located on one side of the outer surface of the filter cartridge.

[0016] Preferably, both the left and right sides of the support plate are adapted to and abut against the inner wall of the connecting block, so that the inner dust collector can move vertically.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. This device, equipped with a separation chamber and a connecting pipe, creates a vortex in the dust-laden air introduced into the separation chamber's inner cavity. Under gravity, the air spirals downwards, generating centrifugal force that throws dust and other impurities towards the inner wall of the separation chamber. This significantly reduces the dust content of the air filtered by the filter bag. Simultaneously, an outer ring dust removal mechanism is installed inside the separation chamber and outside the filter bag to physically isolate the dust-laden air near the inner wall. The centrifugal force generated by the vortex throws the dust-laden air towards the gap between the separation chamber and the inner dust collector, and towards the inner wall of the intermediate groove, directly confining the dust and causing it to move downwards and be collected into the inner cavity of the collection box. This significantly improves the device's dust removal efficiency.

[0019] 2. This device also improves the filter bag cleaning section. A support ring installed on the top of the inner wall of the separation chamber provides rotational support for the fixing ring and the filter bag, allowing the rigid fixing ring to move horizontally within the inner wall of the support ring. The limiting ring installed at the bottom of the support ring also contains a spring with a spiral design, which restricts the fixing ring and keeps it collinear with the axis of the separation chamber when no force is applied. The vibrating wheel is driven by a motor to rotate, and the protrusion of the vibrating wheel pushes the fixing ring to the left with each rotation. The fixing ring causes the filter bag to vibrate, shaking off the dust on the surface of the filter bag, thus completing the efficient cleaning function of the filter bag.

[0020] 3. This device also features an elastic support for the inner dust collector. A support plate installed on the inner wall of the separation chamber provides rigid support, while spring two provides elastic support for the connecting block and the inner dust collector. This allows the filter cartridge to be automatically and synchronously cleaned during operation. The dust-laden air entering the inner wall of the intermediate trough moves downward, creating downward pressure on the inner dust collector due to the inclination of the inner wall. This causes the inner dust collector to move downward, creating wrinkles on the surface of the filter cartridge, which facilitates the removal of some dust. Then, when spring two is compressed, it generates a rebound force, causing the inner dust collector to move upward and reset, straightening the filter cartridge again and efficiently cleaning the dust on its surface. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of this application in a clear and understandable manner.

[0022] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0023] Figure 1 This is a front view diagram of the overall structure of the present invention;

[0024] Figure 2 This is a three-dimensional rear view of the overall structure of the present invention;

[0025] Figure 3 This is a front sectional view of the overall structure of the present invention;

[0026] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A;

[0027] Figure 5 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B;

[0028] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of the structure at point C;

[0029] Figure 7 This is a top sectional view of the separation box of the present invention. Figure 1 ;

[0030] Figure 8 This is a partial schematic diagram of the air outlet duct, motor, vibrating wheel, support ring, fixing ring, filter bag, limiting ring, spring one, connecting block, inner dust collector, support plate and spring two of the present invention.

[0031] Figure 9 This is a top sectional view of the separation box of the present invention. Figure 2 ;

[0032] Figure 10 This is a schematic diagram of the outer ring dust removal mechanism of the present invention.

[0033] The components are as follows: 1. Separation box; 2. Collection box; 3. Receiving door; 4. Air outlet duct; 5. Connecting pipe one; 6. Fan; 7. Connecting pipe two; 8. Connecting pipe three; 9. Dust collection hood; 10. Motor; 11. Vibrating wheel; 12. Support ring; 13. Fixing ring; 14. Filter bag; 15. Limiting ring; 16. Spring one; 17. Connecting block; 18. Inner dust collector; 19. Support plate; 20. Spring two; 21. Air inlet slot; 22. Intermediate slot; 23. Fixer; 24. Filter cartridge. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] Please see Figures 1-10This embodiment discloses a dust recycling device for concrete production, including a separation box 1 and a collection box 2. An air outlet pipe 4 is connected to the top of the separation box 1. The device also includes:

[0036] The air intake mechanism includes a connecting pipe 5, a fan 6, and a connecting pipe 7. The connecting pipe 5 and the fan 6 are fixedly connected to the outer surface of the separation box 1. The connecting pipe 5 and the connecting pipe 7 are connected by bolts. The air outlet end of the fan 6 is fixedly connected to the connecting pipe 7. The air inlet end of the fan 6 is fixedly connected to the connecting pipe 8. The bottom end of the connecting pipe 8 is connected to a dust collection hood 9.

[0037] The outer ring dust removal mechanism includes an inner dust removal cylinder 18 located in the inner cavity of the separation box 1 and multiple sets of support plates 19 fixedly connected to the top of the inner wall of the separation box 1. Multiple sets of connecting blocks 17 are fixedly connected to the outer surface of the inner dust removal cylinder 18. A spring 20 is elastically connected between the connecting blocks 17 and the support plates 19. A fixture 23 is fixedly connected to the bottom of the inner wall of the separation box 1. A filter cylinder 24 is fixedly connected between the inner dust removal cylinder 18 and the fixture 23.

[0038] The inner ring dust removal mechanism includes a fixed ring 13 and a filter bag 14 located in the inner cavity of the inner dust removal cylinder 18. A support ring 12 is fixedly installed on the top of the inner wall of the separation box 1, and the fixed ring 13 is rotatably installed in the support ring 12.

[0039] This device has been redesigned to greatly improve the dust filtration efficiency and reliability of dusty air. It combines a cyclone separator and a bag separator, which can significantly improve dust removal efficiency and realize automatic cleaning of dust removal components, thus significantly improving the reliability of the device.

[0040] This device uses a separation box 1 and a connecting pipe 5 to create a vortex in the dust-laden air introduced into the inner cavity of the separation box 1. Under the action of gravity, the dust-laden air undergoes a downward spiral motion, generating centrifugal force that throws dust and other impurities in the air toward the inner wall of the separation box 1. This significantly reduces the dust content of the air filtered by the filter bag 14. At the same time, an outer ring dust removal mechanism is set in the inner cavity of the separation box 1 and on the outside of the filter bag 14 to physically isolate the dust-laden air near the inner wall of the separation box 1. Under the centrifugal force generated after the formation of the vortex, the dust-laden air is thrown toward the gap between the separation box 1 and the inner dust removal cylinder 18, and onto the inner wall of the intermediate groove 22. This directly restricts the dust and causes it to move downward and be collected into the inner cavity of the collection box 2, thereby significantly improving the dust removal efficiency of the device.

[0041] The collection box 2 is fixedly connected to the bottom end of the separation box 1, and the front of the collection box 2 is equipped with a receiving door 3.

[0042] The collection box 2 is used to collect and recycle dust from the dusty air inside the separation box 1. After the receiving door 3 is opened, the dust inside the collection box 2 can be removed.

[0043] Among them, the top of the separation box 1 is equipped with a motor 10 located on the right side of the air outlet pipe 4. The output shaft of the motor 10 is fixedly installed with a vibrating wheel 11 located in the inner cavity of the separation box 1. The outer surface of the vibrating wheel 11 is provided with a protrusion. The bottom of the support ring 12 is fixedly connected to a limit ring 15. The outer surface of the vibrating wheel 11 abuts against the limit ring 15. A spring 16 is movably sleeved inside the limit ring 15. The inner and outer rings of the spring 16 abut against the fixed ring 13 and the limit ring 15 respectively.

[0044] This device also improves the cleaning part of the filter bag 14. The fixed ring 13 and the filter bag 14 are rotated and supported by the support ring 12 installed on the top of the inner wall of the separation box 1, so that the rigid fixed ring 13 can move horizontally on the inner wall of the support ring 12. The limiting ring 15 installed at the bottom of the support ring 12 is also equipped with a spring 16 with a spiral design inside, so that the spring 16 restricts the fixed ring 13, so that the fixed ring 13 can remain in a collinear position with the axis of the separation box 1 when no force is applied. The motor 10 drives the vibrating wheel 11 to rotate, so that the protrusion of the vibrating wheel 11 pushes the fixed ring 13 to the left with each rotation. The fixed ring 13 drives the filter bag 14 to vibrate, and shakes off the dust on the surface of the filter bag 14, thus completing the efficient cleaning function of the filter bag 14.

[0045] Among them, the top view cross-section of spring 16 is a spiral line, the bottom of the fixing ring 13 is provided with a slot, and the top of the filter bag 14 is fixedly connected to the inside of the slot.

[0046] like Figure 7 As shown, spring 16 can generate tension when compressed, which can drive the fixed ring 13 to move towards its initial position. When the vibrating wheel 11 rotates and pushes the fixed ring 13, spring 16 is compressed and generates tension, driving the fixed ring 13 to reset. This back and forth movement causes the fixed ring 13 to drive the filter bag 14 to vibrate, which helps to clean the dust on the surface of the filter bag 14 and greatly improves the working efficiency of the device.

[0047] The axial cross-sectional shape of both the support ring 12 and the limiting ring 15 is "L" shaped. The inner ring size of the support ring 12 is larger than the inner ring size of the fixed ring 13, so that the fixed ring 13 can move horizontally along the inner wall of the support ring 12.

[0048] like Figure 4 As shown, the fixing ring 13 is rotatably mounted on the inner wall of the support ring 12. The two are coaxially distributed, which can ensure that the fixing ring 13 can move freely horizontally on the inner wall of the support ring 12, while preventing the fixing ring 13 from falling off.

[0049] The shape and size of the inner dust collector 18 are adapted to the shape and size of the separation box 1, and the inner dust collector 18 is made of stainless steel.

[0050] The inner dust collector 18 is installed in the inner cavity of the separation box 1 with a gap fit. The purpose is to isolate the dust-laden air that is thrown towards the separation box 1 and the inner wall of the inner dust collector 18 by centrifugal force, and at the same time, to increase the flow rate of the dust-laden air by using the narrow gap, thereby improving the dust removal efficiency of the device.

[0051] The inner dust collector 18 has a central groove 22 inside, and the top of the inner wall of the inner dust collector 18 has multiple sets of air inlet grooves 21 that communicate with the central groove 22.

[0052] The dust-laden air entering the inner wall of the inner dust collector 18 moves at a faster speed, which increases the vortex rotation into the interior of the intermediate groove 22 and moves downward, causing the dust to fall into the collection box 2 more quickly, thus improving the dust collection efficiency.

[0053] Among them, multiple sets of air inlet slots 21 are equidistantly distributed on the top of the inner wall of the inner dust collector 18 along the axis of the inner dust collector 18. Each set of air inlet slots 21 consists of four slots, and the four air inlet slots 21 are equidistantly distributed in a circle.

[0054] The air inlet slot 21 allows the dust-laden air entering the inner dust collector 18 to smoothly enter the intermediate slot 22 during rotation.

[0055] The filter cartridge 24 and the filter bag 14 are made of the same material, and the bottom of the intermediate groove 22 is located on one side of the outer surface of the filter cartridge 24.

[0056] The filter cartridge 24 and filter bag 14 are made of the same material, and both can filter dust. The device also provides elastic support for the inner dust collector 18. The support plate 19 installed on the inner wall of the separation box 1 provides rigid support, and the connecting block 17 and the inner dust collector 18 are elastically supported by the second spring 20. This allows the filter cartridge 24 to be automatically and synchronously cleaned during operation. The dust-laden air entering the inner wall of the intermediate groove 22 moves downward, and with the cooperation of the inclined inner wall of the intermediate groove 22, it generates downward pressure on the inner dust collector 18, causing the inner dust collector 18 to move downward, making wrinkles appear on the surface of the filter cartridge 24, which facilitates the removal of some dust from the surface of the filter cartridge 24. Then, when the second spring 20 is compressed, it generates a rebound force, thereby causing the inner dust collector 18 to move upward and reset, straightening the filter cartridge 24 again, so that the dust on the surface of the filter cartridge 24 is efficiently cleaned.

[0057] The left and right sides of the support plate 19 are adapted to and abut against the inner wall of the connecting block 17, so that the inner dust collector 18 can move vertically.

[0058] The connecting block 17 is fixedly connected to the inner dust collector 18, and is provided with spring 20 for elastic support. The two sides of the support plate 19 abut against the inner wall of the connecting block 17, thereby realizing the guiding function of the connecting block 17 and the inner dust collector 18.

[0059] Working principle:

[0060] When this device is in operation, firstly, the fan 6 is turned on, and the dust generated during the concrete production process is absorbed through the connecting pipe 3 8 and the dust collection hood 9. The dust-laden air enters the inner cavity of the separation box 1 along the connecting pipe 2 7 and the connecting pipe 1 5. Figure 7 As shown, the dust-laden air enters the inner cavity of the separation box 1 horizontally to the left along the tangential direction of the separation box 1, and forms an air vortex in the inner cavity of the separation box 1, generating centrifugal force and throwing the dust towards the inner wall surface of the separation box 1, so that the dust moves downward along the inner wall of the separation box 1 under the action of gravity.

[0061] Then, under the influence of gravity, the dust-laden air entering the inner cavity of the separation chamber 1 spirals downwards to the interior of the inner dust collector 18 and the gap between the inner dust collector 18 and the inner wall of the separation chamber 1, such as... Figure 3 , Figure 4 and Figure 5 As shown, when the dust-laden air enters the inner cavity of the inner dust collector 18, it still exhibits a spiral centrifugal motion and enters the interior of the intermediate trough 22 along the air inlet trough 21. Due to the small size of the gap between the intermediate trough 22, the inner dust collector 18, and the inner wall of the separation box 1, the speed of the dust-laden air entering the gap increases. When the dust-laden air moves downward along the gap between the inner dust collector 18 and the inner wall of the separation box 1 to the vicinity of the filter cartridge 24, it will pass through the filter cartridge 24 and complete one filtration. The dust will fall downward into the interior of the collection box 2. After the dust-laden air is separated by cyclone separation and a large amount of dust is removed, it enters the vicinity of the filter bag 14 from the bottom axis position of the inner cavity of the separation box 1 and passes through the filter bag 14 to complete fine filtration. The filtered air is then discharged along the air outlet duct 4, while the dust is collected in the collection box 2.

[0062] Finally, when the dust-laden air enters the depths of the inner cavity of the intermediate slot 22, such as Figure 3 As shown, when dusty air enters the inclined section of the inner cavity of the intermediate trough 22, it continuously exerts a downward pressure on the intermediate trough 22 and the inner dust collector 18 as a whole. At this time, under the action of gravity, the inner dust collector 18 drives the connecting block 17 to move downward, compressing the second spring 20. This causes the inner dust collector 18 to drive the filter cylinder 24 downward, creating wrinkles on the surface of the filter cylinder 24, facilitating the removal of some dust from its surface. Then, the second spring 20 generates a rebound force when compressed, thereby driving the inner dust collector 18 upward and resetting, straightening the filter cylinder 24 again, thus efficiently cleaning the dust from its surface. Then, the motor 10 is started, driving the vibrating wheel 11 to rotate continuously. The protruding part on the surface of the vibrating wheel 11 pushes the fixing ring 13 to the left with each rotation. The fixing ring 13 causes the filter bag 14 to vibrate, shaking off the dust from its surface. Figure 7As shown, when the filter bag 14 moves, it will compress the spring 16, thereby driving the fixing ring 13 and the filter bag 14 to reset.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dust recycling device for concrete production, comprising a separation tank (1) and a collection tank (2), an air outlet pipe (4) is communicated and installed at the top of the separation tank (1), characterized in that, Also include: The air inlet mechanism, including the communication pipe one (5), fan (6) and communication pipe two (7), the communication pipe one (5) and fan (6) fixed communication in the outer surface of the separation tank (1), the communication pipe one (5) and communication pipe two (7) are communicated by bolt, the air outlet end of the fan (6) is fixedly connected with the communication pipe two (7), the air inlet end of the fan (6) is fixedly communicated with the communication pipe three (8), the bottom end of the communication pipe three (8) is communicatedly installed with the dust collecting cover (9); The outer ring dust removal mechanism, which comprises a plurality of support plates (19) fixedly connected to the top of the inner wall of the separation tank (1), a plurality of connecting blocks (17) fixedly connected to the outer surface of the inner dust removal cylinder (18), and a spring (20) elastically connected between the connecting block (17) and the support plate (19), wherein the bottom of the inner wall of the separation tank (1) is fixedly connected with a fixing device (23), and the inner dust removal cylinder (18) and the fixing device (23) are fixedly connected with a filter cylinder (24). The inner ring dust removal mechanism comprises a fixed ring (13) and a filter bag (14) located in the inner cavity of the inner dust removal cylinder (18), and the top of the inner wall of the separation tank (1) is fixedly installed with a support ring (12).

2. The dust recycling device for concrete production according to claim 1, characterized in that, The collection tank (2) is fixedly communicated with the bottom end of the separation tank (1), and the front of the collection tank (2) is provided with a material collecting door (3).

3. The dust recycling device for concrete production according to claim 2, characterized in that, The top of the separation tank (1) is provided with a motor (10) located on the right side of the air outlet pipe (4), and the output shaft of the motor (10) is fixedly installed with a vibrating wheel (11) located in the inner cavity of the separation tank (1), wherein the outer surface of the vibrating wheel (11) is provided with a protrusion, the bottom of the support ring (12) is fixedly connected with a limiting ring (15), the outer surface of the vibrating wheel (11) abuts against the limiting ring (15), and the inner spring (16) is movably sleeved in the limiting ring (15).

4. The dust recycling device for concrete production according to claim 3, characterized in that, The top view of the spring (16) is in the shape of a spiral line, the bottom of the fixed ring (13) is provided with a clamping groove, and the top of the filter bag (14) is fixedly connected in the clamping groove.

5. The dust recycling device for concrete production according to claim 4, characterized in that, The shaft cross section shape of the support ring (12) and the limiting ring (15) is "L" shape, the inner ring size of the support ring (12) is larger than that of the fixed ring (13), so that the fixed ring (13) can move horizontally along the inner wall of the support ring (12).

6. The dust recycling device for concrete production according to claim 5, characterized in that, The shape and size of the inner dust removal cylinder (18) are matched with the shape and size of the separation tank (1), and the inner dust removal cylinder (18) is made of stainless steel.

7. The dust recycling device for concrete production according to claim 6, characterized in that, The inner dust removal cylinder (18) is provided with an intermediate groove (22) in the inner wall, and a plurality of air inlet grooves (21) are formed in the top of the inner wall of the inner dust removal cylinder (18) and communicated with the intermediate groove (22).

8. The dust recycling device for concrete production according to claim 7, characterized in that, A plurality of said air inlet slots (21) are equidistantly distributed on the top of the inner wall of the inner dust removal cylinder (18) along the axis of the inner dust removal cylinder (18), and the number of each group of said air inlet slots (21) is four, and the four said air inlet slots (21) are equidistantly distributed in a circle.

9. The dust recycling device for concrete production according to claim 8, characterized in that, The filter cylinder (24) and the filter bag (14) are made of the same material, and the bottom of the middle groove (22) is located on one side of the outer surface of the filter cylinder (24).

10. The dust recycling device for concrete production according to claim 9, characterized in that, The left and right sides of the support plate (19) are adapted to abut the inner wall of the connecting block (17), so that the inner dust removal cylinder (18) can move vertically.

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