Sand and gravel centrifugal separation and circulating mixing device and method

Abstract

The present application relates to the field of construction material recycling, and discloses a sand and gravel centrifugal separation and circulating mixing device, comprising: a vibrating screen machine for vibrating and screening fluid concrete; a frame for supporting the vibrating screen machine; a storage tank located below the vibrating screen machine; a conveying pipe 1 for conveying fluid concrete to the vibrating screen machine; a cyclone, the sand settling port of the cyclone is located at the feed end of the vibrating screen machine; a conveying pipe 2, one end of which is connected to the discharge port of the storage tank and the other end is connected to the feed port of the cyclone; a conveying pipe 3, which is connected to the overflow port of the cyclone and is used to convey out slurry; a mixing and stirring mechanism for receiving the sand and gravel vibrated out of the vibrating screen machine and receiving and stirring the slurry conveyed out of the cyclone. The present application realizes the effective separation and recovery of sand and gravel and slurry in overfilled materials, and accurately mixes sand and gravel with slurry, ensuring the recycling of overfilled materials, reducing cost waste, waste materials and pollutant emissions at the construction site, and reducing environmental impact.

Description

Technical Field

[0001] The present application relates to the field of building material recycling, and in particular to a device and method for centrifugal separation and circulating mixing of sand and gravel. Background Art

[0002] Overfill is a common occurrence during bored pile construction. This refers to excess material that exceeds the design elevation due to excessive concrete pouring or improper concrete flow control. Overfill is typically recycled and processed to reduce costs, construction waste, and environmental pollution.

[0003] However, in the process of implementing relevant technical solutions, it was found that at least the following technical problems exist: At present, for the recovery and treatment of over-filled materials, traditional treatment methods such as mechanical separation only carry out preliminary separation of materials. The separated sand and slurry are relatively rough and cannot be recycled. Summary of the Invention

[0004] The present application provides a device and method for centrifugal separation and circulating mixing of sand and gravel, thereby solving the technical problem in the prior art that the separated sand and gravel and slurry are relatively coarse and cannot be recycled. The application realizes the effective separation and recovery of sand and gravel and slurry in over-filled materials, and accurately mixes sand and gravel and slurry, thereby ensuring the recycling of over-filled materials, reducing cost waste, reducing waste and pollutant emissions at the construction site, and reducing environmental impact.

[0005] The present application provides a sand and gravel centrifugal distribution and circulation mixing device, comprising: a vibrating screen for vibrating and screening fluid concrete; a frame for supporting the vibrating screen; a storage tank installed on the frame and located below the vibrating screen; a conveying pipe 1, on which a slurry pump 1 is installed, and the slurry pump 1 is used to convey the fluid concrete to the vibrating screen through the conveying pipe 1; a cyclone located above the vibrating screen, and the sand settling port of the cyclone is located at the feed end of the vibrating screen; a conveying pipe 2, one end of which is connected to the discharge port of the storage tank and the other end is connected to the feed port of the cyclone, and the conveying pipe 2 is provided with a slurry pump 2 for conveying the slurry in the storage tank to the cyclone through the conveying pipe 2; a conveying pipe 3 is connected to the overflow port of the cyclone for conveying out the slurry; and a mixing and stirring mechanism for receiving the sand and gravel vibrated by the vibrating screen and the slurry conveyed by the cyclone, and stirring them.

[0006] Furthermore, the vibrating screen machine: a frame plate, located above the frame; a vibration spring, fixed between the frame plate and the frame; an upper layer vibrating screen of a fine screen, located above the material storage trough and fixed to the frame plate; a lower layer vibrating screen of a coarse screen, located below the upper layer vibrating screen of a fine screen and fixed to the frame plate; a vibration motor, fixedly mounted on the frame plate.

[0007] Furthermore, the sand settling port of the cyclone is located at the feed end of the upper layer of the fine screen in the vibrating screen machine, and the discharge end of the conveying pipe 1 is located at the feed end of the lower layer of the coarse screen.

[0008] Furthermore, an electric gate valve 1 is installed on the conveying pipe 3, and a return pipe is connected to the conveying pipe 3. The return pipe is located between the electric gate valve 1 and the overflow port of the cyclone. An electric gate valve 2 is installed on the return pipe, and the discharge port of the return pipe is located at the feed end of the upper layer of the fine screen.

[0009] Furthermore, the mixing and stirring mechanism includes: a mixing tank, located on one side of the vibrating screen; a conveying pipe four, one end of which is connected to the slurry feed port of the mixing tank, and the other end is connected to the conveying pipe three, and a flow valve is installed on the conveying pipe four; a metering hopper, installed at the sand and gravel feed port of the mixing tank; a screw conveyor, one end of which is located below the discharge port of the upper layer of the fine screen in the vibrating screen, and the other end is located above the feed port of the metering hopper.

[0010] Furthermore, the delivery pipe three is connected to a flushing pipe, and an electric gate valve three is installed on the flushing pipe. The water outlet of the flushing pipe is located in the storage tank, and the slurry suction port of the delivery pipe two and the water outlet of the flushing pipe are respectively located at both ends of the storage tank.

[0011] Furthermore, the flushing pipe portion located in the material storage tank is connected to a plurality of flushing nozzles, and the plurality of flushing nozzles are evenly distributed along the length direction of the flushing pipe.

[0012] The present application also provides a method for centrifugal classification and circulating mixing of sand and gravel, which uses the above-mentioned centrifugal classification and circulating mixing device of sand and gravel, and the method for centrifugal classification and circulating mixing of sand and gravel includes: conveying fluid concrete to the lower vibration screen of the coarse screen through a conveying pipe 1, and the fluid concrete is coarsely screened to form a slurry with small particles of sand and gravel; conveying the slurry with small particles of sand and gravel in the storage tank to a cyclone through a conveying pipe 2, and the small particles of sand and gravel in the slurry enter the upper vibration screen of the fine screen, and the slurry enters a conveying pipe 3; conveying the slurry to a mixing tank through a conveying pipe 4; conveying the sand and gravel to a metering hopper through a bolt conveyor; the flow valves on the metering hopper and the conveying pipe 3 respectively control the amount of sand and gravel and the amount of slurry entering the mixing tank; and the mixing tank mixes the sand and gravel and the slurry to form fluid concrete.

[0013] Furthermore, the electric gate valve 1 is closed and the electric gate valve 3 is opened, and the mortar in the delivery pipe 3 enters the flushing pipe, and the slurry in the flushing pipe flushes the storage tank.

[0014] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0015] Because a vibrating screen is used to separate the debris and usable sand and gravel in the over-filled materials, and a cyclone is used to separate the sand and gravel and slurry, and then the amount of sand and gravel and slurry entering the mixing tank is precisely controlled, high-quality fluid concrete with precisely controlled proportions is finally formed under the stirring of the mixing tank, which realizes the effective separation and recovery of sand and gravel and slurry in the over-filled materials, and then reuses them to form fluid concrete, reducing cost waste, waste and pollutant emissions at the construction site, and reducing environmental impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of a sand and gravel centrifugal separation and circulating mixing device in an embodiment of the present application;

[0017] Figure 2 for Figure 1 Another perspective view of the medium sand and gravel centrifugal distribution and circulating mixing device;

[0018] Figure 3 for Figure 2 Schematic diagram of the structure of the medium vibration screening machine;

[0019] Figure 4 for Figure 1 The cross-sectional diagram of the middle part mainly illustrates the structure of the flushing pipe in the storage tank;

[0020] Figure 5 for Figure 1 Another view of the medium sand and gravel centrifugal distribution and circulating mixing device;

[0021] Figure 6This is a flow chart of a method for centrifugal separation and circulating mixing of sand and gravel in an embodiment of the present application;

[0022] In the figure: 1. Vibrating screen; 11. Frame plate; 12. Vibrating spring; 13. Vibrating screen mesh on the upper layer of fine screen; 14. Vibrating screen mesh on the lower layer of coarse screen; 15. Vibrating motor; 2. Frame; 3. Storage tank; 4. Delivery pipe 1; 41. Slurry pump 1; 5. Cyclone; 6. Delivery pipe 2; 61. Slurry pump 2; 7. Delivery pipe 3; 71. Electric gate valve 1; 8. Mixing and stirring mechanism; 81. Mixing tank; 82. Delivery pipe 4; 821. Flow valve; 83. Measuring hopper; 84. Screw conveyor; 91. Return pipe; 911. Electric gate valve 2; 92. Flushing pipe; 921. Electric gate valve 3; 922. Flushing nozzle. DETAILED DESCRIPTION

[0023] The embodiment of the present application discloses a device and method for centrifugal separation and circulating mixing of sand and gravel, which conveys fluid concrete to the lower vibrating screen 14 of the coarse screen through the conveying pipe 1, and the fluid concrete is coarsely screened to form a slurry with small particles of sand and gravel. The slurry with small particles of sand and gravel in the storage tank 3 is then conveyed to the cyclone 5 through the conveying pipe 2 6, and the small particles of sand and gravel in the slurry enter the upper vibrating screen 13 of the fine screen, and the slurry enters the conveying pipe 3 7. Then, the slurry is conveyed to the mixing tank 81 through the conveying pipe 4 82, and the bolt conveyor conveys the sand and gravel to the metering hopper 83. The metering hopper 83 and the flow valve 821 on the conveying pipe 3 7 respectively control the amount of sand and gravel and the amount of slurry entering the mixing tank 81. The mixing tank 81 mixes the sand and gravel and the slurry to form fluid concrete, thereby achieving effective separation and recovery of sand and gravel and slurry in over-filled materials, and accurately mixing the sand and gravel with the slurry, ensuring the recycling of over-filled materials and reducing cost waste.

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] This application provides a sand and gravel centrifugal material distribution and circulation mixing device, referring to Figure 1 and Figure 2The sand and gravel centrifugal classification and circulating mixing device includes a vibrating screen 1, a frame 2, a storage tank 3, a conveying pipe 4, a cyclone 5, a conveying pipe 2 6, a conveying pipe 3 7, a mixing and stirring mechanism 8, a return pipe 91, and a flushing pipe 92. The frame 2 is placed on the ground, and the storage tank 3 is installed in the frame 2. The storage tank 3 is rectangular and horizontally arranged. The top surface of the storage tank 3 is completely open. The vibrating screen 1 is installed on the frame 2, and the vibrating screen 1 is located directly above the storage tank 3. The material flowing out of the vibrating screen 1 will enter the storage tank 3. The cyclone 5 is tilted and located at the feed end of the vibrating screen 1. The height of the overflow port in the cyclone 5 is higher than the height of the sand settling port. The mixing and stirring mechanism 8 is located on one side of the vibrating screen 1, and the mixing and stirring mechanism 8 is arranged in parallel with the vibrating screen 1.

[0026] Continue to refer to Figure 1 and Figure 3 As shown, the vibrating screen machine 1 includes a frame plate 11, vibration springs 12, a fine screen upper layer vibration screen mesh 13, a coarse screen lower layer vibration screen mesh 14, and a vibration motor 15. Multiple frame plates 11 are provided, and are located above the frame 2. There is a gap between the bottom of the frame plate 11 and the top of the frame 2. Multiple frame plates 11 are evenly distributed along the length of the storage trough 3. Vibration springs 12 are fixed between the bottom of the frame plate 11 and the top of the frame 2, and multiple vibration springs 12 are provided on both sides of the top surface of the frame 2. The fine screen upper layer vibrating screen 13 is located above the storage tank 3 and is fixed to the frame plate 11. The end of the fine screen upper layer vibrating screen 13 close to the cyclone 5 is higher than the other end. The coarse screen lower layer vibrating screen 14 is located below the fine screen upper layer vibrating screen 13 and is fixed to the frame plate 11. The coarse screen lower layer vibrating screen 14 and the fine screen upper layer vibrating screen 13 are parallel to each other, and the mesh size of the coarse screen lower layer vibrating screen 14 is larger than that of the fine screen upper layer vibrating screen 13. The coarse screen lower layer vibrating screen 14 can screen out larger sand and gravel particles and debris, while the fine screen upper layer vibrating screen 13 can screen out smaller sand and gravel particles. The slurry can fall from the fine screen upper layer vibrating screen 13 and the coarse screen lower layer vibrating screen 14 and enter the storage tank 3. The vibration motor 15 is fixedly mounted on the frame plate 11. Starting the vibration motor 15 can start the vibration screening machine 1.

[0027] Reference Figure 1 and Figure 2As shown, a slurry pump 41 is installed on the delivery pipe 4. The discharge end of the delivery pipe 4 is located at the feed end of the coarse screen lower layer vibrating screen 14. The feed end of the delivery pipe 4 can be placed in a pool containing fluid concrete to be divided. The slurry pump 41 can be used to transport the fluid concrete in the pool through the delivery pipe 4 to the coarse screen lower layer vibrating screen 14 of the vibrating screen machine 1. After the fluid concrete enters the coarse screen lower layer vibrating screen 14, the larger sand and gravel particles are screened out, and the remaining slurry containing small sand and gravel particles falls into the storage tank 3. In addition, the sand settling port of the cyclone 5 is located at the feed end of the fine screen upper layer vibrating screen 13 in the vibrating screen machine 1. The sand and gravel slurry flowing out of the cyclone 5 enters the fine screen upper layer vibrating screen 13 for screening.

[0028] Continue to refer to Figure 1 and Figure 2 As shown, a slurry pump 61 is installed on the second delivery pipe 6. One end of the delivery pipe 6 is connected to the discharge port of the storage tank 3, and the other end is connected to the feed port of the cyclone 5. The slurry pump 61 can be used to transport the slurry in the storage tank 3 to the cyclone 5 through the delivery pipe 6. The slurry that falls from the vibrating screen 14 under the coarse screen into the storage tank 3 can enter the cyclone 5 under the action of the slurry pump 61. Under the centrifugal force of the cyclone 5, small particles of sand and gravel in the slurry and part of the slurry can flow out of the sand settling port of the cyclone 5 and eventually flow into the vibrating screen 13 on the upper layer of the fine screen, while the majority of the slurry will flow out of the overflow port of the cyclone 5.

[0029] Reference Figure 2 and Figure 4 As shown, delivery pipe 3 7 is connected to the overflow port of cyclone 5. Electric gate valve 1 71 is installed on delivery pipe 3 7. Electric gate valve 1 71 can be controlled by remote control or program settings to block and unblock delivery pipe 3 7. Return pipe 91 has one end connected to delivery pipe 3 7 and the other end located at the feed end of the fine screen upper layer vibrating screen 13. Electric gate valve 2 911 is installed on return pipe 91. Electric gate valve 2 911 can be controlled by remote control or program settings to block and unblock return pipe 91. Return pipe 91 is located between electric gate valve 1 71 and the overflow port of cyclone 5. Therefore, when electric gate valve 1 71 is closed and electric gate valve 2 911 is opened, the slurry in cyclone 5 flows through delivery pipe 3 to return pipe 91, and then from return pipe 91 to the fine screen upper layer vibrating screen 13, achieving secondary vibrating screening of the slurry in cyclone 5. When the slurry flowing out of the cyclone 5 is suitable for secondary utilization, the electric gate valve 2 911 is closed and the electric gate valve 1 71 is opened, so that the slurry in the delivery pipe 3 7 can be reused.

[0030] Continue to refer to Figure 2 and Figure 4As shown, the flushing pipe 92 is connected to the delivery pipe 3 7. The water outlet of the flushing pipe 92 is located in the storage tank 3. The portion of the flushing pipe 92 located in the storage tank 3 is connected to a plurality of flushing nozzles 922. The plurality of flushing nozzles 922 are evenly distributed along the length of the flushing pipe 92. The flushing pipe 92 is installed with an electric gate valve 3 921. The electric gate valve 3 921 can be controlled by remote control or program setting to achieve the isolation and unblocking of the flushing pipe 92. The electric gate valve 1 71 is located between the flushing pipe 92 and the overflow port of the cyclone 5. When the electric gate valve 1 71 and the electric gate valve 3 921 are opened at the same time, the slurry in the delivery pipe 3 will enter the flushing pipe 92. The slurry in the flushing pipe 92 is sprayed out by the flushing nozzles 922, thereby flushing the inner wall of the storage tank 3. Closing the electric gate valve 3 921 can terminate the flushing.

[0031] Reference Figure 5 As shown, the mixing and stirring mechanism 8 includes a mixing tank 81, a delivery pipe 82, a metering hopper 83, and a screw conveyor 84. The mixing tank 81 is located on one side of the vibrating screen 1 and is close to the cyclone 5; one end of the delivery pipe 82 is connected to the slurry feed port of the mixing tank 81, and the other end is connected to the delivery pipe 3 7. The height of the slurry feed port of the mixing tank 81 is lower than the height of the connection between the delivery pipe 3 7 and the delivery pipe 4 82 to ensure that the slurry in the delivery pipe 3 7 can flow into the mixing tank 81. A flow valve 821 is installed on the delivery pipe 82 to control the amount of slurry entering the mixing tank 81; the metering hopper 83 is installed at the sand and gravel feed port of the mixing tank 81. At the opening of the vibrating screen 1, a metering hopper 83 can measure the weight and flow the material into the mixing tank 81 at the rated weight. A screw conveyor 84 is located on one side of the vibrating screen 1 and on the same side as the mixing tank 81. One end of the screw conveyor 84 is located below the discharge port of the fine screen upper layer vibrating screen 13 in the vibrating screen 1, and the other end is located above the feed port of the metering hopper 83. The small particles of sand and gravel screened by the fine screen upper layer vibrating screen 13 will fall into the screw conveyor 84, and the screw conveyor 84 can be used to transport the small particles of sand and gravel to the metering hopper 83. Therefore, the metering hopper 83 and the flow valve 821 on the conveying pipe 3 7 can respectively control the amount of sand and gravel and the amount of slurry entering the mixing tank 81, thereby adjusting the mix ratio in real time and accurately controlling the mix ratio and performance of the mixed materials, ensuring the quality of the recycled concrete and avoiding the problem of quality degradation.

[0032] The functional principle of the sand and gravel centrifugal distribution and circulating mixing device can be explained through the following operation methods:

[0033] When it is necessary to recover and process the overfilled materials generated during bored pile construction, the fluid concrete to be separated is placed in a pool and conveyed to the vibrating screen 14 below the coarse screen via the conveying pipe 1 4 . The slurry falls into the storage tank 3 . The slurry in the storage tank 3 is conveyed to the cyclone 5 via the conveying pipe 2 6 . Under the centrifugal force of the cyclone 5 , the small particles of sand and gravel in the slurry and part of the slurry can flow out of the sand settling port of the cyclone 5 , and most of the slurry will flow out of the overflow port of the cyclone 5 . The metering hopper 83 and the flow valve 821 on the conveying pipe 3 7 can respectively control the amount of sand and gravel and the amount of slurry entering the mixing tank 81 . The mixing tank 81 is stirred, and finally, high-quality fluid concrete with a precisely controlled ratio is formed.

[0034] This application also provides a method for centrifugal separation and circulating mixing of sand and gravel, referring to Figure 6 As shown, the sand and gravel centrifugal material distribution and circulation mixing method includes:

[0035] S1, coarse screen for fluid concrete.

[0036] In the specific implementation, the fluid concrete to be separated in the pool can be transported to the coarse screen lower layer vibrating screen 14 of the vibrating screen machine 1 through the slurry pump 41. After the fluid concrete enters the coarse screen lower layer vibrating screen 14, the larger particles of sand and gravel and debris will be screened out, and the remaining slurry with small particles of sand and gravel will fall into the storage tank 3.

[0037] S2, cyclone to separate sand and gravel from slurry.

[0038] In a specific implementation, the slurry in the storage tank 3 can be caused to enter the cyclone 5 under the action of the slurry pump 2 61. Under the action of the centrifugal force of the cyclone 5, the small particles of sand and gravel in the slurry and part of the slurry can flow out from the sand settling port of the cyclone 5 and finally flow into the upper layer of the fine screen 13, while most of the slurry will flow out from the overflow port of the cyclone 5.

[0039] S3, accurately controls the slurry entering the mixing tank.

[0040] In a specific implementation, the slurry flowing out of the overflow port of the cyclone 5 can enter the delivery pipe 9 82 , and the flow valve 821 on the delivery pipe 9 82 can accurately control the amount of slurry entering the mixing tank 81 .

[0041] S4, accurately controls the sand and gravel entering the mixing tank.

[0042] In a specific implementation, the small particles of sand and gravel screened out by the upper vibrating screen 13 of the fine screen will fall into the screw conveyor 84, and the screw conveyor 84 can be used to transport the small particles of sand and gravel to the metering hopper 83. The metering hopper 83 can measure the weight and flow the sand and gravel into the mixing tank 81 at the rated weight.

[0043] S5, stirring and mixing.

[0044] In specific implementation, after the rated sand, gravel and slurry flow into the mixing tank 81, they can be stirred to eventually form high-quality fluid concrete with precisely controlled proportions, thereby achieving effective separation and recovery of sand, gravel and slurry in the over-filled materials, and accurately mixing the sand, gravel and slurry, ensuring the recycling of over-filled materials, reducing cost waste, reducing waste and pollutant emissions at the construction site, and reducing environmental impact.

[0045] S6, flush the storage tank.

[0046] In a specific implementation, the electric gate valve 1 71 can be closed and the electric gate valve 3 921 can be opened, and the mortar in the delivery pipe 3 7 will enter the flushing pipe 92. The flushing nozzle 922 on the pipe part of the delivery pipe 3 7 located in the storage tank 3 will spray out the slurry, thereby flushing the inner wall of the storage tank 3. When the electric gate valve 3 921 is closed, the flushing can be stopped.

[0047] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0048] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A sand and gravel centrifugal dividing and circulating mixing device, characterized in that: include: A vibrating screen machine (1) for vibrating and screening fluid concrete; A frame (2) for supporting the vibrating screen machine (1); A material storage trough (3) is mounted on the frame (2) and is located below the vibrating screen (1); A delivery pipe (4), wherein a slurry pump (41) is installed on the delivery pipe (4), and the slurry pump (41) is used to deliver fluid concrete to the vibrating screen (1) through the delivery pipe (4); A cyclone (5) is located above the vibrating screen (1), and a sand settling port of the cyclone (5) is located at the feed end of the vibrating screen (1); A second conveying pipe (6), one end of which is in communication with the discharge port of the storage tank (3) and the other end of which is in communication with the feed port of the cyclone (5); a second slurry pump (61) is provided on the second conveying pipe (6) for conveying the slurry in the storage tank (3) to the cyclone (5) through the second conveying pipe (6); A delivery pipe (7) is connected to the overflow port of the cyclone (5) and is used to deliver the slurry; A mixing and stirring mechanism (8) is used to receive the sand and gravel screened by the vibrating screen (1) and the slurry delivered by the cyclone (5), and to stir them; The vibrating screen machine (1): A frame plate (11) is located above the frame body (2); A vibration spring (12) is fixed between the frame plate (11) and the frame body (2); A fine screen upper layer vibrating screen (13) is located above the material storage trough (3) and fixed on the frame plate (11); A coarse screen lower layer vibrating screen (14) is located below the fine screen upper layer vibrating screen (13) and is fixed to the frame plate (11); A vibration motor (15) is fixedly mounted on the frame plate (11); The sand settling port of the cyclone (5) is located at the feed end of the upper layer vibrating screen (13) of the fine screen in the vibrating screen machine (1), and the discharge end of the conveying pipe 1 (4) is located at the feed end of the lower layer vibrating screen (14) of the coarse screen; The mixing and stirring mechanism (8) comprises: A stirring tank (81) is located on one side of the vibrating screen machine (1); A delivery pipe four (82), one end of which is connected to the slurry feed port of the mixing tank (81), and the other end of which is connected to the delivery pipe three (7), and a flow valve (821) is installed on the delivery pipe four (82); A metering hopper (83) is installed at the sand and gravel feeding port of the mixing tank (81); The screw conveyor (84) has one end located below the discharge port of the fine screen upper layer vibrating screen (13) in the vibrating screen machine (1), and the other end located above the feed port of the metering hopper (83).

2. A sand and gravel centrifugal distribution and circulating mixing device according to claim 1, characterized in that: The conveying pipe 3 (7) is installed with an electric gate valve 1 (71), and the conveying pipe 3 (7) is connected with a return pipe (91). The return pipe (91) is located between the electric gate valve 1 (71) and the overflow port of the cyclone (5). The return pipe (91) is installed with an electric gate valve 2 (911), and the discharge port of the return pipe (91) is located at the feed end of the upper layer vibration screen (13) of the fine screen.

3. The device for centrifugal separation and circulating mixing of sand and gravel according to claim 1, characterized in that: The delivery pipe (3) (7) is connected to a flushing pipe (92), and an electric gate valve (3) (921) is installed on the flushing pipe (92). The water outlet of the flushing pipe (92) is located in the storage tank (3), and the slurry suction port of the delivery pipe (2) (6) and the water outlet of the flushing pipe (92) are respectively located at both ends of the storage tank (3).

4. A sand and gravel centrifugal distribution and circulating mixing device as claimed in claim 3, characterized in that: The flushing pipe (92) is connected to a portion of the pipe located in the material storage tank (3) with a plurality of flushing nozzles (922), and the plurality of flushing nozzles (922) are evenly distributed along the length direction of the flushing pipe (92).

5. A method for centrifugal separation and circulating mixing of sand and gravel, characterized in that: A sand and gravel centrifugal distribution and circulating mixing device according to any one of claims 1 to 4 is used, and a sand and gravel centrifugal distribution and circulating mixing method comprises: The fluid concrete is conveyed to the coarse screen lower layer vibration screen (14) through the conveying pipe 1 (4), and the fluid concrete is coarsely screened to form a slurry with small particles of sand and gravel; The slurry containing small sand and gravel particles in the storage tank (3) is transported to the cyclone (5) by using the second conveying pipe (6). The small sand and gravel particles in the slurry enter the upper vibrating screen (13) of the fine screen, and the slurry enters the third conveying pipe (7); The slurry is transported to the mixing tank (81) by using the transport pipe (82); The sand and gravel are transported to the metering hopper (83) by means of a bolt conveyor (84); The flow valve (821) on the metering hopper (83) and the delivery pipe (7) respectively controls the amount of sand and gravel and the amount of slurry entering the mixing tank (81); The mixing tank (81) mixes the sand and the slurry to form fluid concrete.

6. A method for centrifugal separation and circulating mixing of sand and gravel according to claim 5, characterized in that: Also includes: The electric gate valve 1 (71) is closed, the electric gate valve 3 (921) is opened, and the mortar in the delivery pipe 3 (7) enters the flushing pipe (92), and the slurry in the flushing pipe (92) flushes the storage tank (3).

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