Mixing system and method for ceramsite sand proppant production

Abstract

The invention relates to the technical field of proppant mixing, and discloses a material mixing system and method for ceramsite sand proppant production, and the material mixing system comprises a feeding unit, a material mixing unit, a high-pressure gas supply unit and a controller, the storage bin feeds materials into the batching pipe, and the preparation raw materials are blown into the mixing unit through the high-pressure air supply unit; the material mixing unit is provided with a material mixing box which is internally provided with a material mixing chamber and a plurality of material uniformizing runners; a plurality of material uniformizing plates are sequentially arranged at the discharging end of the material uniformizing flow channel in the material conveying direction, so that materials flowing out of each material uniformizing flow channel are distributed in a laminar flow mode and sequentially fall into the discharging end of the material mixing cavity along a preset path of the material mixing cavity to be alternately mixed, and a mixed material is obtained. Compared with a conventional stirring mixer, the stirring mixer has the advantages that the materials do not need to be added into a mixing barrel for long-time stirring processing, and the production period can be greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of proppant mixing, and in particular to a mixing system and method for producing ceramsite sand proppant. Background Art

[0002] Oil fracturing proppants are important materials for fracturing operations in the oil extraction industry. In the development of proppants, quartz sand and ceramsite sand are two commonly used fracturing proppants in the fracturing operation. Quartz sand proppants have defects such as easy breakage, poor conductivity and low sphericity, and are difficult to be used in deep oil and gas well fracturing. Ceramsite sand has the advantages of high strength, good sphericity and low acid solubility, and has achieved great development in the field of oil fracturing proppants. Among them, before granulation of ceramsite sand proppants, at least two or more prepared raw materials need to be mixed evenly to obtain a mixture, and then the mixture is sent to the disc granulator for further processing and molding; but the existing mixing equipment needs to use a stirring component to stir multiple prepared raw materials in a mixing barrel for a long time to make the materials evenly mixed, which greatly prolongs the production cycle. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a mixing system and method for producing ceramsite sand proppants to solve the technical problems mentioned in the prior art.

[0004] A mixing system for producing ceramsite sand proppant, the mixing system comprising: A feeding unit, comprising at least two storage bins, each of which is provided with a feeding pipe inclined downward on one side of the bottom, the discharge port of the feeding pipe being connected to the feed port of the batching pipe, and the feed port of the feeding pipe being provided with an electronic valve to control the material stored in the storage bin to flow into the batching pipe through the feeding pipe; A mixing unit comprises a mixing box, wherein a mixing chamber and a plurality of equalizing flow channels corresponding to the number of the storage bins are arranged inside the mixing box, the plurality of equalizing flow channels are evenly arranged in a vertical direction at the feed end of the mixing chamber, and the discharge end of each of the equalizing flow channels is connected to the feed end of the mixing chamber, the feed end of the equalizing flow channel is connected to the discharge port of the dispensing pipe through a feeding pipe, and the discharge end of the equalizing flow channel is sequentially provided with a plurality of equalizing plates along the material conveying direction so as to distribute the materials flowing out of each of the equalizing flow channels in a laminar flow state and orderly fall into the discharge end of the mixing chamber along a preset path of the mixing chamber for alternating mixing to obtain a mixed material, wherein; At least two groups of the material balancing plates are arranged in each of the material balancing channels, and the mesh apertures on the two groups of the material balancing plates decrease in sequence along the material conveying direction, and the mesh apertures of the material balancing plates close to the discharge end of the material balancing channel are larger than the particle size of the material, so as to ensure that the material flows out of the material balancing channel smoothly; The high-pressure gas supply unit has a high-pressure gas storage tank, the gas outlet of the high-pressure gas storage tank is connected to the gas inlet of each of the batching pipes through a gas pipeline, the gas inlet of the batching pipe and the material outlet of the batching pipe are located on the same axis, and the gas inlet of each of the batching pipes is installed with a proportional regulating valve, and the proportional regulating valve is connected to a controller. The controller obtains a corresponding regulating signal according to the unit area weight ratio of each material in the expanded clay sand proppant to adjust the opening and closing degree of each of the proportional regulating valves to control the high-pressure gas storage tank to input gas of corresponding pressure into each of the batching pipes to blow the material in the batching pipe into the mixing box, thereby realizing rapid mixing of the materials.

[0005] Optionally, the discharging end of the mixing chamber is provided with an auxiliary material discharge structure, and the auxiliary material discharge structure has: A material discharge bin, wherein a buffer chamber and a material discharge chamber are sequentially arranged in a vertical direction and are interconnected, the material discharge end of the mixing chamber is connected to a material feed port arranged on the inner side wall of the buffer chamber, the material discharge chamber is a conical cylinder, and a material discharge port is arranged at the bottom of the material discharge chamber; A pressure relief component, the pressure relief component is arranged in the discharge chamber, and the pressure relief component has: A rotating shaft, the rotating shaft is a hollow tube, the rotating shaft is arranged on the center line of the discharge chamber, one end of the rotating shaft passes through the buffer chamber and extends to the top of the lower bin and is rotatably connected to a bearing, the bearing is installed on the top of the lower bin through a bearing seat, the other end of the rotating shaft extends to a side near the bottom of the discharge chamber and is provided with a filter element, the mesh aperture of the filter element surface is smaller than the particle size of the material; A fan blade, the fan blade is mounted on the outer circumference of the rotating shaft and is located in the buffer chamber; A spoiler is installed on the outer periphery of the rotating shaft and is located in the unloading chamber. The periphery of the spoiler is inclined downward and extends to contact the inner wall of the unloading chamber to form a spoiler layer with a grid.

[0006] Optionally, the discharge end of the mixing chamber is a strip-shaped flow channel inclined downward.

[0007] Optionally, the discharge end of the material balancing channel is a conical cavity, the material balancing plate is installed in the conical cavity, and the height of the conical cavity decreases successively along the material conveying direction.

[0008] Optionally, the spoiler has: An upper connecting ring, the inner circumference of which is mounted on the outer circumference of the rotating shaft through a first auxiliary strip, so as to form a centrifugal groove between the inner circumference of the upper connecting ring and the outer circumference of the rotating shaft to disperse the material to the inner circumference of the discharge chamber; A lower connecting ring, the inner circumference of which is mounted on the outer circumference of the rotating shaft through a second auxiliary strip, and the outer circumference of which is rotatably connected to the inner side wall of the discharge chamber; A plurality of groups of spoiler strips are evenly distributed along the annular direction between the opposite surfaces of the upper connecting ring and the lower connecting ring, and the opposite ends of each spoiler strip are respectively connected to the upper connecting ring and the lower connecting ring to form a grille with a material passing trough.

[0009] Optionally, the controller has: A setting module for inputting the initial gas pressure conveying parameters of any material in the ceramsite sand proppant and a pressure adjustment coefficient having a ratio relationship of the unit area weight of each material; A storage module, connected to the setting module, for storing input initial air pressure delivery parameters and pressure regulation coefficients; A proportional calculation module, connected to the storage module, for retrieving the pressure regulation coefficient stored in the storage module and calculating the air pressure conveying parameters of the remaining materials according to the initial air pressure conveying parameters; The A / D conversion module is connected to the proportional operation module and is used to convert the pneumatic conveying parameters of each material into a digital signal to generate an adjustment signal and send it to the corresponding proportional control valve to adjust the opening and closing degree of each proportional control valve to control the discharge amount of each material layer flowing out of the material distribution channel.

[0010] Optionally, the side of the mixing chamber away from the material evenly distributing flow channel is an arc-shaped structure, and the top end of the mixing chamber is smaller than the bottom end thereof to control the jet distance of the material layers flowing out of the plurality of material evenly distributing flow channels, and the two adjacent material layers are overlapped in sequence along the arc-shaped surface of the mixing chamber and then fall into the discharge end of the mixing chamber in an orderly manner, so as to guide the multiple material layers along the preset path of the mixing chamber.

[0011] A mixing method for producing ceramsite sand proppant is applied to the mixing system described above, and the mixing method comprises the following steps: A corresponding number of storage bins are configured according to the preparation formula of the ceramsite sand proppant, and one or more uniformly mixed materials are stored in each storage bin, and the particle size distribution of the materials stored in the storage bin is uniform; The controller obtains the corresponding adjustment signal according to the ratio of the unit area weight of the materials stored in each storage bin to adjust the opening and closing degree of each proportional regulating valve to control the high-pressure gas storage tank to input the gas of corresponding pressure into each batching pipe to blow the materials in the batching pipe into the mixing box; The material flowing out of each material balancing channel is distributed in a laminar flow state by the material balancing plate in the mixing box and falls into the material discharging end of the mixing chamber in an orderly manner along a preset path of the mixing chamber for alternate mixing to obtain a mixed material.

[0012] The beneficial effects that the present invention can produce include: The present invention provides a mixing system and method for producing expanded clay sand proppants, which can achieve mixing while conveying materials. Compared with conventional stirring mixers, there is no need to add materials into a mixing barrel and then carry out long-term stirring processing, which can greatly shorten the production cycle. At the same time, the feeding speed of the dosing pipe is adjusted by a proportional control valve, which can not only accurately control the discharge amount of materials in each material distribution channel to improve the material mixing effect, but also can prepare expanded clay sand proppants with different proportions according to user requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a mixing system for producing ceramsite sand proppants according to the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the internal structure of the mixing box and the lower silo; Figure 3 For the present invention Figure 2 A schematic diagram of the structure of a spoiler; Figure 4 This is a schematic diagram of the architecture of a controller of a mixing system for producing ceramsite sand proppant according to the present invention; In the figure: 1. storage bin, 2. feeding pipe, 3. batching pipe, 4. mixing box, 5. mixing chamber, 6. material distribution channel, 7. material distribution plate, 8. high-pressure gas storage tank, 9. gas transmission pipeline, 10. proportional control valve, 11. unloading bin, 12. buffer chamber, 13. unloading chamber, 14. rotating shaft, 15. bearing, 16. filter element, 17. fan blade, 18. spoiler disk, 19. upper connecting ring, 20. lower connecting ring, 21. spoiler strip, 22. controller, 23. setting module, 24. storage module, 25. proportional operation module, 26. A / D conversion module, 27. feeding pipe. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-Figure 4As shown, the present invention provides a mixing system for producing ceramsite sand proppants, the mixing system includes a feeding unit, a mixing unit, a high-pressure gas supply unit and a controller 22, the feeding unit has at least two storage bins 1, and a feeding pipe 2 is arranged on one side of the bottom of each storage bin 1, and the discharge port of the feeding pipe 2 is connected to the feed port of the batching pipe 3, and the feed port of the feeding pipe 2 is provided with an electronic valve to control the material stored in the storage bin 1 to flow into the batching pipe 3 through the feeding pipe 2; wherein the batching pipe 3 is a T-shaped three-way pipe , two interfaces located on the same axis are respectively connected to the high-pressure air supply unit and the mixing unit as the air inlet and the outlet, and the remaining interface is vertically arranged upward as the feed inlet and connected to the outlet of the feeding pipe 2; the mixing unit has a mixing box 4, and the mixing box 4 is provided with a mixing chamber 5 and a plurality of equalizing flow channels 6 corresponding to the number of the storage bins 1, and the plurality of equalizing flow channels 6 are evenly arranged in the vertical direction at the feed end of the mixing chamber 5, and the outlet end of each equalizing flow channel 6 is connected to the feed end of the mixing chamber 5 The feed end of the material-distributing channel 6 is connected to the discharge port of the batching pipe 3 through a feeding pipe 27. The discharge end of the material-distributing channel 6 is sequentially provided with a plurality of material-distributing plates 7 along the material conveying direction so as to distribute the materials flowing out of each material-distributing channel 6 in a laminar flow state and orderly fall into the discharge end of the mixing chamber 5 along a preset path of the mixing chamber 5 for alternate mixing to obtain a mixed material; the high-pressure gas supply unit has a high-pressure gas storage tank 8, and the gas outlet of the high-pressure gas storage tank 8 is connected to the gas inlet of each batching pipe 3 through a gas transmission pipeline 9. The air inlet and the outlet of the batching pipe 3 are located on the same axis. The air inlet of each batching pipe 3 is equipped with a proportional regulating valve 10, which is connected to the controller 22. The controller 22 obtains the corresponding regulating signal according to the unit area weight ratio of each material in the ceramsite sand proppant to adjust the opening and closing degree of each proportional regulating valve 10 to control the high-pressure gas storage tank 8 to input the corresponding pressure gas into each batching pipe 3 to blow the material in the batching pipe 3 into the mixing box 4 to achieve rapid mixing of the material. In the above-mentioned mixing system, the mixing effect can be achieved synchronously when conveying the material. Compared with the previous stirring mixer, it is not necessary to add the material into the mixing barrel and then perform a long-term stirring process, which can greatly shorten the production cycle; at the same time, by adjusting the feeding speed of the batching pipe 3 through the proportional regulating valve 10, not only can the discharge amount of the material in each material distribution channel 6 be accurately controlled to improve the material mixing effect, but also ceramsite sand proppants with different proportions can be prepared according to the user's use requirements.

[0016] Furthermore, an auxiliary unloading structure is provided at the discharge end of the mixing chamber 5, and the auxiliary unloading structure has a unloading bin 11 and a pressure relief component; the interior of the unloading bin 11 is sequentially provided with a buffer chamber 12 and a discharge chamber 13 which are interconnected in the vertical direction, and the discharge end of the mixing chamber 5 is connected to a feed port provided on the inner side wall of the buffer chamber 12, and the discharge chamber 13 is a conical cylinder, and a unloading port is provided at the bottom of the unloading chamber 13, so that the mixed material passes through the buffer chamber 12 and the unloading chamber 13 and is discharged from the unloading port; the pressure relief component is arranged in the unloading chamber 13, wherein the pressure relief component has a rotating shaft 14, a fan blade 17 and a spoiler 18, and the rotating shaft 14 is a hollow tube, and the rotating shaft 14 is provided with On the center line of the unloading chamber 13, one end of the rotating shaft 14 passes through the buffer chamber 12 and extends to the top of the lower bin 11 and is rotatably connected to a bearing 15. The bearing 15 is fixedly installed on the top of the lower bin 11 through a bearing seat. The other end of the rotating shaft 14 extends to the bottom side near the unloading chamber 13 and is provided with a filter element 16. The mesh aperture on the surface of the filter element 16 is smaller than the particle size of the material; the fan blades 17 are fixedly installed on the outer periphery of the rotating shaft 14 and are located in the buffer chamber 12; the spoiler 18 is fixedly installed on the outer periphery of the rotating shaft 14 and is located in the unloading chamber 13. The spoiler 18 is tilted downward and extends around to contact the inner wall of the unloading chamber 13 to form a spoiler layer with a grid.

[0017] Specifically, during use of the mixing system, the discharge port of the discharge bin 11 is connected to the feed end of the ball mill so that the mixture in the mixing box 4 is blown into the discharge bin 11 under the continuous flow of high-pressure airflow. At the same time, the high-pressure airflow drives the fan blades 17 to rotate, so as to break up the mixture and drop it into the unloading chamber 13. Then, with the continuous rotation of the fan blades 17, the rotating shaft 14 is driven to rotate, and then the spoiler disk 18 is driven to rotate to stir the mixture, thereby realizing a secondary mixing effect, which can further ensure that the mixture is mixed evenly; and, when the high-pressure airflow flows through the fan blades 17 and the spoiler disk 18, it encounters resistance to slow down the flow rate of the high-pressure airflow, which helps the high-pressure airflow to flow through the filter element 16 and be discharged from the top of the rotating shaft 14 to achieve the purpose of pressure relief.

[0018] Furthermore, the discharge end of the mixing chamber 5 is a strip flow channel inclined downward, so that the layered materials flowing out of the multiple material distribution channels 6 fall into the strip flow channels respectively and mix alternately in a stacked manner, and are blown downward along the inclined surface of the strip flow channel into the lower silo 11 under the pressure of the high-pressure airflow to achieve rapid mixing.

[0019] Furthermore, the discharge end of the material-distributing channel 6 is a conical cavity, the material-distributing plate 7 is installed in the conical cavity, and the height of the conical cavity decreases successively along the material conveying direction to form a pressure difference in the material-distributing channel 6, so that the material can quickly pass through the mesh holes on the surface of the material-distributing plate 7 under the action of high pressure and evenly diffuse into the material-distributing channel 6, and the material can be output in layers by reducing the discharge end height of the conical cavity. In the above, at least two groups of material-distributing plates 7 are installed in each material-distributing channel 6, and the mesh apertures on the two groups of material-distributing plates 7 decrease successively along the material conveying direction, and the mesh apertures of the material-distributing plates 7 on the side of the discharge end of the material-distributing channel 6 are larger than the particle size of the material to ensure that the material flows out of the material-distributing channel 6 smoothly.

[0020] Furthermore, the spoiler 18 has an upper connecting ring 19, a lower connecting ring 20 and a plurality of spoiler strips 21. The inner periphery of the upper connecting ring 19 is fixedly mounted on the outer periphery of the rotating shaft 14 through a first auxiliary strip, so as to form a centrifugal groove between the inner periphery of the upper connecting ring 19 and the outer periphery of the rotating shaft 14 to disperse the material to the inner periphery of the discharge chamber 13; the inner periphery of the lower connecting ring 20 is fixedly mounted on the outer periphery of the rotating shaft 14 through a second auxiliary strip, and the outer periphery of the lower connecting ring 20 is rotatably connected to the inner side wall of the discharge chamber 13 to reinforce the spoiler 18. 8 installation strength, to ensure that the spoiler 18 under the disturbance of high pressure airflow stable rotation; a plurality of spoiler strips 21 are evenly distributed along the annular direction between the upper connecting ring 19 and the lower connecting ring 20 of the opposite surface, and each spoiler strip 21 of the opposite ends are respectively connected with the upper connecting ring 19 and the lower connecting ring 20 to form a grid with a trough, so that when the mixed material passes through the cross section of the inclined trough, the material is stirred by the downward centrifugal force generated by the spoiler strip 21 during the rotation process, to achieve the effect of secondary mixing.

[0021] Furthermore, the controller 22 has a setting module 23, a storage module 24, a proportional operation module 25, and an A / D conversion module 26. The setting module 23 is used to input the initial air pressure conveying parameters of any material in the expanded clay sand proppant and the pressure regulation coefficient having the ratio relationship of the unit area weight of each material; the storage module 24 is connected to the setting module 23, and is used to store the input initial air pressure conveying parameters and pressure regulation coefficient; the proportional operation module 25 is connected to the storage module 24, and is used to call the pressure regulation coefficient stored in the storage module 24 and calculate the air pressure conveying parameters of the remaining materials according to the initial air pressure conveying parameters; the A / D conversion module 26 is connected to the proportional operation module 25, and is used to convert the air pressure conveying parameters of each material into a digital signal to generate an adjustment signal and send it to the corresponding proportional control valve 10 to adjust the opening and closing degree of each proportional control valve 10 to control the discharge amount of the material layer flowing out of each material balancing flow channel 6. In the above, the operator can arbitrarily input the initial air pressure conveying parameters of any material in the setting module 23 according to the processing requirements to change the production efficiency; at the same time, the pressure regulation coefficient of each material in the expanded clay sand proppant can be input in the setting module 23 according to the user's usage requirements to change the output of the material layer flowing out of each material balancing flow channel 6 to prepare expanded clay sand proppants with different properties.

[0022] Furthermore, the side of the mixing chamber 5 away from the material distribution channel 6 is an arc-shaped structure, and the top end of the mixing chamber 5 is smaller than the bottom end thereof to control the jet distance of the material layer flowing out of the plurality of material distribution channels 6, and the two adjacent material layers are overlapped in sequence along the arc-shaped surface of the mixing chamber 5 and then fall into the discharge end of the mixing chamber 5 in an orderly manner, so as to guide the multiple material layers along the preset path of the mixing chamber 5.

[0023] A mixing method for producing ceramsite sand proppants is applied to the above-mentioned mixing system, and the mixing method comprises the following steps: configuring a corresponding number of storage bins 1 according to the preparation formula of the ceramsite sand proppants, storing one or more uniformly mixed materials in each storage bin 1, and the particle size distribution of the materials stored in the storage bin 1 is uniform; a controller 22 obtains a corresponding adjustment signal according to the unit area weight ratio of the materials stored in each storage bin 1 to adjust the opening and closing degree of each proportional regulating valve 10 to control the high-pressure gas storage tank 8 to input gas of corresponding pressure into each batching pipe 3 to blow the materials in the batching pipe 3 into the mixing box 4; the material flowing out of each batching flow channel 6 is distributed in a laminar flow state through the equalizing plate 7 in the mixing box 4, and falls into the discharge end of the mixing chamber 5 in an orderly manner along the preset path of the mixing chamber 5 for alternating mixing to obtain a mixture. Furthermore, under the continuous flow of gas, the mixture obtained by mixing in the mixing box 4 is introduced into the auxiliary unloading structure for pressure relief treatment; the gas drives the mixture to flow into the buffer chamber 12 and drives the fan blades 17 to rotate, and the mixture transported in the horizontal direction is adjusted to be transported in the vertical direction and transported to the unloading chamber 13 through the fan blades 17; the fan blades 17 drive the rotating shaft 14 and the spoiler 18 to rotate synchronously to stir the mixture falling into the unloading chamber 13 to achieve secondary mixing; the gas is filtered by the filter element 16 and discharged from the top of the rotating shaft 14; the mixture flows into the next processing unit from the unloading port of the unloading chamber 13.

[0024] In one of the above-mentioned embodiments, the preparation formula of the ceramsite sand proppant is composed of 15-20% purple clay, 10-15% silica and 65-75% raw aluminum ore in weight proportion. In the mixing system, three storage bins are equipped to store purple clay, silica and raw aluminum ore with a particle size of ≤10mm respectively. When mixing, the electronic valves on the discharge ends of the three storage bins 1 are opened at the same time to feed the three materials into the corresponding batching pipes 3 through the feeding pipes 2 respectively, and the controller 22 obtains the corresponding adjustment signal according to the unit area weight ratio of the materials stored in each storage bin 1 to adjust the opening and closing degree of each proportional control valve 10 to control the high-pressure gas storage tank 8 to input the corresponding gas into each batching pipe 3. The pressurized gas blows the material in the dosing pipe 3 into the mixing box 4 for rapid mixing; wherein, the unit area weight ratio of purple clay, silica and raw aluminum ore is set to 3.9-4.2:2.2-2.4:2.2-2.8, preferably, the unit area weight ratio of purple clay, silica and raw aluminum ore is 4.1:2.33:2.6, so that the pressure regulation coefficient of the proportional control valve 10 is 4.1:2.33:2.6 according to the unit area weight ratio of purple clay, silica and raw aluminum ore. The material flowing out of each material balancing channel 6 is distributed in a laminar flow through the material balancing plate 7 in the mixing box 4 and falls in an orderly manner along the curved surface of the mixing chamber 5 to the discharge end of the mixing chamber 5 for alternate mixing, so as to obtain a mixed material which is input into the lower hopper 11 for pressure relief treatment and then transported to the ball mill for grinding treatment to avoid excessive pressure in the mixing box 4 and the lower hopper 11, which may cause the materials to be unable to be mixed in an orderly manner according to the preset path.

Claims

1. A mixing system for producing ceramsite sand proppant, characterized in that: The mixing system comprises: A feeding unit, comprising at least two storage bins (1), each of the bottom sides of the storage bins (1) being provided with a feeding pipe (2) inclined downward, the discharge port of the feeding pipe (2) being connected to the feed port of a material distribution pipe (3), the feed port of the feeding pipe (2) being provided with an electronic valve to control the material stored in the storage bin (1) to flow into the material distribution pipe (3) through the feeding pipe (2); A mixing unit comprises a mixing box (4), wherein a mixing chamber (5) and a plurality of equalizing flow channels (6) corresponding to the number of the storage bins (1) are arranged inside the mixing box (4), wherein the plurality of equalizing flow channels (6) are evenly arranged in a vertical direction at the feed end of the mixing chamber (5), and the discharge end of each of the equalizing flow channels (6) is connected to the feed end of the mixing chamber (5), the feed end of the equalizing flow channel (6) is connected to the discharge port of the dispensing pipe (3) through a feeding pipe (27), and the discharge end of the equalizing flow channel (6) is sequentially arranged along the material conveying direction to distribute the material flowing out of each of the equalizing flow channels (6) in a laminar flow state and orderly fall into the discharge end of the mixing chamber (5) along a preset path of the mixing chamber (5) for alternate mixing to obtain a mixed material, wherein; At least two groups of the material balancing plates (7) are arranged in each of the material balancing channels (6), the mesh apertures of the two groups of the material balancing plates (7) decrease in sequence along the material conveying direction, and the mesh apertures of the material balancing plates (7) close to the material discharge end of the material balancing channel (6) are larger than the particle size of the material, so as to ensure that the material can flow out of the material balancing channel (6) smoothly; A high-pressure gas supply unit comprises a high-pressure gas storage tank (8), the gas outlet of the high-pressure gas storage tank (8) is connected to the gas inlet of each of the batching pipes (3) through a gas transmission pipeline (9), the gas inlet of the batching pipe (3) and the material outlet of the batching pipe (3) are located on the same axis, and the gas inlet of each of the batching pipes (3) is installed with a proportional control valve (10), and the proportional control valve (10) is connected to a controller (22), and the controller (22) obtains a corresponding adjustment signal according to the unit area weight ratio of each material in the ceramsite sand proppant to adjust the opening and closing degree of each of the proportional control valves (10) to control the high-pressure gas storage tank (8) to input gas of corresponding pressure into each of the batching pipes (3) to blow the material in the batching pipe (3) into the mixing box (4), thereby realizing rapid mixing of the materials.

2. A mixing system for producing ceramsite sand proppant according to claim 1, characterized in that: The discharging end of the mixing chamber (5) is provided with an auxiliary material discharge structure, and the auxiliary material discharge structure has: A material discharge bin (11), wherein a buffer chamber (12) and a discharge chamber (13) are arranged in sequence in the vertical direction and are interconnected, the discharge end of the mixing chamber (5) is connected to a feed port arranged on the inner wall of the buffer chamber (12), the discharge chamber (13) is a conical cylinder, and a discharge port is arranged at the bottom of the discharge chamber (13); A pressure relief component, the pressure relief component is arranged in the discharge chamber (13), and the pressure relief component has: A rotating shaft (14), wherein the rotating shaft (14) is a hollow tube, and the rotating shaft (14) is arranged on the center line of the discharge chamber (13). One end of the rotating shaft (14) passes through the buffer chamber (12) and extends to the top of the discharge bin (11) and is rotatably connected to a bearing (15). The bearing (15) is installed on the top of the discharge bin (11) through a bearing seat. The other end of the rotating shaft (14) extends to a side close to the bottom of the discharge chamber (13) and is provided with a filter element (16). The mesh aperture of the surface of the filter element (16) is smaller than the particle size of the material. A fan blade (17), the fan blade (17) being mounted on the outer periphery of the rotating shaft (14) and being located in the buffer chamber (12); A spoiler (18) is mounted on the outer periphery of the rotating shaft (14) and is located in the discharge chamber (13); the periphery of the spoiler (18) is inclined downward and extends to contact the inner wall of the discharge chamber (13) to form a spoiler layer with a grid.

3. A mixing system for producing ceramsite sand proppant according to claim 2, characterized in that: The discharge end of the mixing chamber (5) is a strip-shaped flow channel inclined downward.

4. A mixing system for producing ceramsite sand proppant according to claim 1, characterized in that: The discharge end of the material balancing channel (6) is a conical cavity, the material balancing plate (7) is installed in the conical cavity, and the height of the conical cavity decreases successively along the material conveying direction.

5. A mixing system for producing ceramsite sand proppant according to claim 2, characterized in that: The spoiler (18) has: an upper connecting ring (19), the inner circumference of the upper connecting ring (19) being mounted on the outer circumference of the rotating shaft (14) via a first auxiliary strip, so as to form a centrifugal groove between the inner circumference of the upper connecting ring (19) and the outer circumference of the rotating shaft (14) to disperse the material to the inner circumference of the discharge chamber (13); a lower connecting ring (20), the inner periphery of the lower connecting ring (20) being mounted on the outer periphery of the rotating shaft (14) via a second auxiliary strip, and the outer periphery of the lower connecting ring (20) being rotatably connected to the inner side wall of the discharge chamber (13); A plurality of groups of spoiler strips (21), the plurality of groups of spoiler strips (21) being evenly distributed along the annular direction between the opposing surfaces of the upper connecting ring (19) and the lower connecting ring (20), and the opposing ends of each spoiler strip (21) are respectively connected to the upper connecting ring (19) and the lower connecting ring (20) to form a grille with a material passing trough.

6. A mixing system for producing ceramsite sand proppant according to claim 2, characterized in that: The controller (22) has: A setting module (23) is used to input the initial gas pressure conveying parameters of any material in the ceramsite sand proppant and a pressure adjustment coefficient having a ratio relationship of the unit area weight of each material; A storage module (24), connected to the setting module (23), and used for storing input initial air pressure delivery parameters and pressure regulation coefficients; A proportional calculation module (25), connected to the storage module (24), used to retrieve the pressure regulation coefficient stored in the storage module (24) and calculate the air pressure conveying parameters of the remaining materials according to the initial air pressure conveying parameters; The A / D conversion module (26) is connected to the proportional operation module (25) and is used to convert the air pressure conveying parameters of each material into a digital signal to generate an adjustment signal and send it to the corresponding proportional control valve (10) to adjust the opening and closing degree of each proportional control valve (10) to control the discharge amount of each material layer flowing out of the uniform material flow channel (6).

7. A mixing system for producing ceramsite sand proppant according to claim 2, characterized in that: The side of the mixing chamber (5) away from the material-distributing channel (6) is an arc-shaped structure, and the top end of the mixing chamber (5) is smaller than the bottom end thereof so as to control the jet distance of the material layers flowing out of the plurality of material-distributing channels (6), and the two adjacent material layers are overlapped in sequence along the arc-shaped surface of the mixing chamber (5) and then fall into the discharge end of the mixing chamber (5) in an orderly manner, so as to guide the multiple material layers along the preset path of the mixing chamber (5).

8. A mixing method for producing ceramsite sand proppant, characterized in that: Applicable to the mixing system according to any one of claims 1 to 7, the mixing method comprises the following steps: A corresponding number of storage bins (1) are configured according to the preparation formula of the ceramsite sand proppant, and one or more uniformly mixed materials are stored in each of the storage bins (1), and the particle size distribution of the materials stored in the storage bins (1) is uniform; The controller (22) obtains a corresponding adjustment signal according to the weight ratio of the materials stored in each storage bin (1) to adjust the opening and closing degree of each proportional control valve (10) so as to control the high-pressure gas storage tank (8) to input gas of corresponding pressure into each batching pipe (3) to blow the materials in the batching pipe (3) into the mixing box (4); The material flowing out of each material balancing channel (6) is distributed in a laminar flow manner by the material balancing plate (7) in the mixing box (4) and falls in an orderly manner along a preset path of the mixing chamber (5) to the discharge end of the mixing chamber (5) for alternating mixing to obtain a mixed material.

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