Powder-liquid mixing device

Abstract

The invention relates to the technical field of mixing equipment, and discloses a powder-liquid mixing device. A powder-liquid primary mixer is provided with a primary mixing feed port, a primary mixing discharge port and an exhaust port. The powder-liquid primary mixer preliminarily mixes liquid fed through the primary mixing feed port with powder. A powder-gas separator is provided with an air inlet, an air outlet and a powder discharge port. The exhaust port is connected with the air inlet through an exhaust pipe. A powder-liquid strong mixer is provided with a strong mixing feed port, a powder return port and a strong mixing discharge port. The powder-gas separator separates gas containing powder from powder and feeds the separated powder into the powder return port through the powder discharge port, and the separated gas is discharged through the air outlet. The primary mixing discharge port is connected with the strong mixing feed port, and the powder discharge port is connected with the powder return port. The powder-liquid strong mixer can mix the powder-liquid mixture fed through the primary mixing discharge port with the powder fed into the powder return port. The invention realizes continuous mixing and stirring production of powder and liquid, realizes powder-gas separation simultaneously, and the separated powder can be automatically reused.

Description

Technical Field

[0001] The invention relates to the technical field of mixing equipment, in particular to a powder-liquid mixing device. Background Art

[0002] Powder and liquid mixing and dispersion are widely used in the chemical industry. With the promotion of clean production workshops and the adaptation to various environmental protection requirements such as green emission reduction, it is necessary to quickly separate the gas contained in the powder during the powder-liquid mixing production process. The gas contains a large amount of dust (powder) that is not mixed with the liquid. It is necessary to eliminate the adverse effects caused by dust and gas during the production process.

[0003] There are currently two commonly used solutions. One is to set an exhaust port and a filter device at the location where dust is generated (cloth bags or sintered filter elements are commonly used as filter devices). However, due to the increasing requirements of factory products, the particle size of dust (powder) is getting smaller and smaller, and many use nanomaterials. This requires the continuous improvement of the filtering accuracy of the filter to meet the filtering requirements, but this will lead to a decrease in exhaust efficiency, and the residual air pressure in the mixing scene will have an adverse effect on subsequent production, and it is easy to cause bubbles to appear in the mixture; the second is to set a dust collection bin at the location where dust is generated, and then connect it to the dust collector through the dust removal air duct to extract all the dust from the production site to achieve the effect of eliminating dust. However, the extracted dust is large, and the dust accumulated in the dust collector needs to be cleaned regularly and frequently. Because in order to achieve the dust removal effect, it is necessary to maintain a large air volume and high power exhaust. The dust collector needs to use a larger power and a larger powder accumulation hopper, resulting in waste of powder raw materials, high cost of purchasing dust collectors and high cost of later maintenance and use. Summary of the invention

[0004] The purpose of the present invention is to provide a powder-liquid mixing device to realize continuous mixing and stirring production of powder and liquid, realize powder-gas separation, and automatically reuse the separated powder.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a powder-liquid mixing device, including a powder-liquid primary mixer, a powder-gas separator and a powder-liquid intensive mixer, the powder-liquid primary mixer is provided with a primary mixing feed port, a primary mixing discharge port and an exhaust port, the powder-liquid primary mixer preliminarily mixes the liquid fed through the primary mixing feed port with the powder, the powder-gas separator is provided with an air inlet, an air outlet and a powder discharge port, the exhaust port is connected with the air inlet through an exhaust pipe, the powder-liquid intensive mixer is provided with a intensive mixing feed port, a powder return port and a intensive mixing discharge port, the powder-gas separator separates the gas containing the powder from the powder, and the separated powder is fed into the powder return port through the powder discharge port, and the separated gas is discharged through the air outlet, the primary mixing discharge port is connected with the intensive mixing feed port, the powder discharge port is connected with the powder return port, and the powder-liquid intensive mixer can mix the powder-liquid mixture fed from the primary mixing discharge port with the powder fed from the powder return port.

[0006] As a preferred solution of the present invention, the powder-liquid primary mixer includes a primary mixing shell, a conveying and mixing shaft arranged in the inner cavity of the primary mixing shell, and a primary mixing driver for driving the conveying and mixing shaft to rotate, the conveying and mixing shaft includes a conveying and mixing section and an exhaust section arranged in sequence along the discharge direction, the rotation direction of the spiral blades of the conveying and mixing section is opposite to the rotation direction of the spiral blades of the exhaust section, the primary mixing discharge port and the exhaust port are arranged in sequence at the end of the primary mixing shell along the discharge direction of the powder-liquid primary mixer, the primary mixing discharge port is located below the end of the conveying and mixing section, the primary mixing shell is mounted on the powder-liquid intensive mixer, and the primary mixing discharge port is butt-connected to the intensive mixing feed port.

[0007] As a preferred solution of the present invention, the conveying and mixing section includes multiple conveying sections, and the pitches of the multiple conveying sections decrease step by step along the discharging direction.

[0008] As a preferred solution of the present invention, two conveying and mixing shafts are provided in the primary mixing shell, the primary mixing driver includes a primary mixing motor and a primary mixing gear box, the output shaft of the primary mixing motor is connected to the input end of the primary mixing gear box, the output end of the primary mixing gear box is connected to the two conveying and mixing shafts and drives the two conveying and mixing shafts to rotate in opposite directions; the powder-liquid intensive mixer includes a mixing shell, a mixing screw shaft, a mixing motor and a mixing gear box, two mixing screw shafts are provided, the output shaft of the mixing motor is connected to the input end of the mixing gear box, the output end of the mixing gear box is connected to the two mixing screw shafts and drives the two mixing screw shafts to rotate in the same direction in the inner cavity of the mixing shell.

[0009] As a preferred solution of the present invention, the primary mixing feed port includes a primary mixing powder inlet and a primary mixing liquid inlet, the primary mixing powder inlet and the primary mixing liquid inlet are both arranged on the top surface of the head end of the primary mixing shell, the primary mixing powder inlet is provided with a powder inlet hopper, and the powder inlet hopper is provided with multiple powder adding ports.

[0010] As a preferred solution of the present invention, the powder return port and the intensive mixing feed port are sequentially arranged on the top surface of the head end of the mixing shell along the discharge direction of the powder-liquid intensive mixer, and the primary mixing powder inlet and the primary mixing liquid inlet are sequentially arranged on the top surface of the primary mixing shell along the discharge direction of the powder-liquid primary mixer.

[0011] As a preferred solution of the present invention, the powder-gas separator includes a cylinder and an air outlet pipe, the diameter of the cylinder gradually decreases from top to bottom, the air inlet is connected to the upper side wall of the cylinder, and the air inlet is tangent to the circumferential direction of the cylinder, the air outlet pipe is arranged at the top of the cylinder and extends into the middle of the inner cavity of the cylinder, the air outlet is located at the top of the air outlet pipe, the bottom end of the air outlet pipe is lower than the position of the air inlet, and the powder discharge port is arranged at the bottom of the cylinder.

[0012] As a preferred solution of the present invention, the bottom opening of the air outlet pipe is in an inverted cone shape.

[0013] As a preferred solution of the present invention, the air outlet pipe is vertically arranged in the center of the cylinder.

[0014] As a preferred solution of the present invention, the air outlet is connected to a negative pressure exhaust and dust removal system.

[0015] Compared with the prior art, the powder-liquid mixing device according to the embodiment of the present invention has the following beneficial effects:

[0016] The present invention realizes the initial mixing of powder and liquid to form a powder-liquid mixture in the powder-liquid primary mixer, and the powder-liquid primary mixer sends the powder-liquid mixture into the powder-liquid intensive mixer for secondary mixing, which greatly improves the powder-liquid mixing and dispersion effect. At the same time, the gas containing powder generated by the powder-liquid primary mixer during the mixing process can be discharged from the exhaust port to the powder-gas separator for powder-gas separation. The separated powder flows back to the powder-liquid intensive mixer through the powder discharge port and the powder return port of the powder-liquid intensive mixer to continue to participate in the mixing of the powder-liquid mixture. The separated gas is discharged through the gas outlet, so that the powder is not discharged along with the gas, resulting in a waste of raw materials, so that the powder content of the discharged gas is greatly reduced, and the number of subsequent manual cleaning of the rear-end dust removal equipment is reduced. The powder-gas separator can balance the internal air pressure of the powder-liquid primary mixer, which is beneficial to reducing the design requirements for the sealing structure of the powder-liquid mixing device, and there is no need to set a filter at the powder gas generation location. It can be seen that the present invention can realize continuous mixing and stirring production of powder and liquid, and simultaneously realize powder-gas separation. The separated powder is automatically reused, which reduces the waste of raw materials and reduces dust overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] Figure 1 A schematic diagram of the structure of a powder-liquid mixing device provided by the present invention;

[0019] Figure 2 A schematic diagram of the internal structure of the powder-liquid primary mixer and the powder-gas separator provided by the present invention;

[0020] In the figure, a powder-liquid primary mixer 1; a primary mixing shell 11; a primary mixing powder inlet 111; a primary mixing liquid inlet 112; an exhaust port 113; a primary mixing discharge port 114; a conveying and mixing shaft 12; a conveying and mixing section 121; an exhaust section 122; a primary mixing motor 13; a primary mixing gear box 14; a powder-gas separator 2; a cylinder 21; a first separation chamber 211; a second separation chamber 212; an air inlet 22; an air outlet 23; a powder discharge port 24; an air outlet pipe 25; a powder-liquid intensive mixer 3; an intensive mixing feed port 31; a powder return port 32; an intensive mixing discharge port 33; a mixing motor 34; a mixing gear box 35; an exhaust pipe 4; a powder inlet hopper 5; and a powder adding port 51. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top” and “bottom” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] like Figure 1 to Figure 2 As shown, a powder-liquid mixing device according to a preferred embodiment of the present invention comprises a powder-liquid primary mixer 1, a powder-gas separator 2 and a powder-liquid intensive mixer 3, wherein the powder-liquid primary mixer 1 is provided with a primary mixing feed port, a primary mixing discharge port 114 and an exhaust port 113, and the powder-liquid primary mixer 1 preliminarily mixes the liquid fed through the primary mixing feed port with the powder, the powder-gas separator 2 is provided with an air inlet 22, an air outlet 23 and a powder discharge port 24, the exhaust port 113 is connected to the air inlet 22 through an exhaust pipe 4, and the powder-liquid intensive mixer 3 is provided with an exhaust pipe 4. The mixing feed port 31, the powder return port 32 and the strong mixing discharge port 33, the powder-gas separator 2 separates the gas containing powder into powder and the separated powder is sent to the powder return port 32 through the powder discharge port 24, and the separated gas is discharged through the gas outlet 23, the primary mixing discharge port 114 is connected to the strong mixing feed port 31, the powder discharge port 24 is connected to the powder return port 32, and the powder-liquid strong mixer 3 can mix the powder-liquid mixture sent into the primary mixing discharge port 114 with the powder sent into the powder return port 32.

[0024] Exemplarily, the primary mixing feed port includes a primary mixing powder feed port 111 and a primary mixing liquid feed port 112, both of which are arranged on the top surface of the head end of the primary mixing shell 11, and the primary mixing powder feed port 111 is provided with a powder feed hopper 5, and the powder feed hopper 5 is provided with a plurality of powder adding ports 51, and different kinds of powder conveying pipes can be connected to different powder adding ports 51 respectively. According to actual needs, various powders can be automatically fed into the powder-liquid primary mixer 1 through different powder adding ports 51 in a certain proportion through different powder adding ports 51 (a single powder can also be conveyed through one of the powder adding ports 51) through the powder feed hopper 5. In this embodiment, the primary mixing powder inlet 111 and the primary mixing liquid inlet 112 are sequentially arranged on the top surface of the front end of the primary mixing shell 11 along the discharge direction of the powder-liquid primary mixer 1, so that the powder is transported to the rear end by the conveying pressure generated by the high-speed rotation of the conveying mixing shaft 12 in the powder-liquid primary mixer 1, and a certain proportion of liquid is added from the primary mixing liquid inlet 112 located at the rear end of the primary mixing powder inlet 111, and then pre-mixed with the powder by the conveying pressure of the powder-liquid primary mixer 1 and transported to the powder-liquid intensive mixer 3.

[0025] Exemplarily, the powder-liquid primary mixer 1 includes a primary mixing shell 11, a conveying and mixing shaft 12 arranged in the inner cavity of the primary mixing shell 11, and a primary mixing driver for driving the conveying and mixing shaft 12 to rotate, the conveying and mixing shaft 12 includes a conveying and mixing section 121 and an exhaust section 122 arranged in sequence along the discharge direction, the conveying and mixing shaft 12 is a conveying and mixing screw shaft, the rotation direction of the spiral blades of the conveying and mixing section 121 is opposite to the rotation direction of the spiral blades of the exhaust section 122, the length of the conveying and mixing section 121 is much larger than the length of the exhaust section 122, the primary mixing outlet 114 and the exhaust port 113 are arranged in sequence at the end of the primary mixing shell 11 along the discharge direction of the powder-liquid primary mixer 1, the primary mixing outlet 114 is located below the end of the conveying and mixing section 121, the primary mixing shell 11 is mounted on the powder-liquid intensive mixer 3, and the powder-liquid primary mixer 3 is provided with a primary mixing outlet 114. The primary mixing powder inlet 111 and the primary mixing liquid inlet 112 of the machine 1 are respectively fed into the powder and the liquid, and the conveying pressure of the conveying mixing shaft 12 is used to realize preliminary premixing and convey the materials to the powder-liquid intensive mixer 3. The rear section of the conveying mixing shaft 12 is provided with an exhaust section 122 which is opposite to the rotation direction of the spiral blades of the conveying mixing section 121. The exhaust section 122 realizes reverse conveying and can limit the movement of the powder and liquid mixed material toward the exhaust port 113, so that the powder and liquid mixture is forcibly conveyed to the primary mixing discharge port 114 opposite to the end of the conveying mixing section 121 and then enters the powder-liquid intensive mixer 3 for secondary mixing. Specifically, the powder-liquid primary mixer 1 and the powder-liquid intensive mixer 3 are arranged in a T shape, and the primary mixing discharge port 114 is butt-connected with the intensive mixing feed port 31. The powder-liquid primary mixer 1 directly discharges the material into the powder-liquid intensive mixer 3, which greatly reduces the conveying distance, quickly performs secondary mixing, and improves the mixing effect.

[0026] Furthermore, the conveying and mixing section 121 includes multiple conveying sections, and the pitches of the multiple conveying sections decrease step by step along the discharging direction, thereby improving the initial mixing effect between the powder and the liquid.

[0027] Specifically, the primary mixing shell 11 is provided with two conveying and mixing shafts 12, the primary mixing driver includes a primary mixing motor 13 and a primary mixing gear box 14, the output shaft of the primary mixing motor 13 is connected to the input end of the primary mixing gear box 14, the output end of the primary mixing gear box 14 is connected to the two conveying and mixing shafts 12 and drives the two conveying and mixing shafts 12 to rotate in opposite directions, the two conveying and mixing shafts 12 are meshed, the two conveying and mixing shafts 12 rotate in opposite directions, the material is subjected to strong shearing, stirring and calendering between the two conveying and mixing shafts 12, and rapid primary mixing is achieved; the powder-liquid intensive mixer 3 includes a mixing shell, a mixing screw shaft, a mixing motor 34 and a mixing gear box 35, There are two mixing screw shafts, the output shaft of the mixing motor 34 is connected to the input end of the mixing gear box 35, the output end of the mixing gear box 35 is connected to the two mixing screw shafts and drives the two mixing screw shafts to rotate in the same direction in the inner cavity of the mixing shell, the two mixing screw shafts are meshed, and the two mixing screw shafts rotate in the same direction, so that the material moves forward in an "∞" shape between the two mixing screw shafts, and the screws rotating in the same direction have opposite speeds at the meshing point, one mixing screw shaft pulls the material into the meshing gap, and the other mixing screw shaft pushes the material out, thereby achieving efficient mixing and dispersion of the material, greatly improving the mixing and dispersion effect of the powder-liquid mixing device.

[0028] Exemplarily, the powder return port 32 and the strong mixing feed port 31 are sequentially arranged on the top surface of the front end of the mixing shell along the discharge direction of the powder-liquid strong mixer 3, and the primary mixing powder inlet 111 and the primary mixing liquid inlet 112 are sequentially arranged on the top surface of the primary mixing shell 11 along the discharge direction of the powder-liquid primary mixer 1. The powder separated by the powder-gas separator 2 enters the powder return port 32 and is forwardly transported by the powder-liquid strong mixer 3 to the rear end of the powder-liquid strong mixer 3 for further mixing and dispersion, thereby improving the mixing effect of the refluxed powder and the mixed material.

[0029] Exemplarily, the powder-gas separator 2 includes a cylinder 21 and an air outlet pipe 25, the cylinder diameter of the cylinder 21 gradually decreases from top to bottom, the air inlet 22 is connected to the upper side wall of the cylinder 21, and the air inlet 22 is tangent to the circumferential direction of the cylinder 21, the air outlet pipe 25 is arranged at the top of the cylinder 21 and extends into the middle of the inner cavity of the cylinder 21, and the air outlet pipe 25 is vertically arranged in the center of the cylinder 21, the air outlet 23 is located at the top of the air outlet pipe 25, and the bottom end of the air outlet pipe 25 is located below the cylinder 21. The position of the air inlet 22, the powder discharge port 24 is set at the bottom of the cylinder 21; the gas containing powder enters the upper part of the cylinder 21 tangentially from the air inlet 22 to form a rotating airflow. In the process of the rotating airflow spiraling from top to bottom, the dust is affected by the centrifugal force and thrown outward to the inner wall of the cylinder 21. The dust moves downward along the inner wall of the cylinder 21 and is then discharged into the powder-liquid mixer 3 at the powder return port 32; in addition, the end of the air outlet pipe 25 is kept away from the air inlet 22, so that the distance of the airflow's spiral downward movement in the cylinder 21 is as long as possible to better separate the dust. Furthermore, the cylinder 21 includes a first separation chamber 211 in a quasi-cylindrical shape (gradually shrinking from top to bottom) and a second separation chamber 212 in an inverted cone shape, and the inclination slope of the second separation chamber 212 is much greater than the inclination slope of the first separation chamber 211. The first separation chamber 211 is arranged above the second separation chamber 212, and the inverted cone-shaped second separation chamber 212 can shrink in the second separation chamber 212 and flow toward the center to form a secondary vortex upwards and be discharged out of the cyclone separator from the lower end pipe mouth of the outlet pipe 25.

[0030] Furthermore, the bottom opening of the air outlet pipe 25 is in an inverted cone shape, and the contraction of the bottom opening of the air outlet pipe 25 effectively prevents the powder in the cylinder 21 from entering the air outlet pipe 25, thereby reducing the waste of powder.

[0031] Exemplarily, the air outlet 23 is connected to a negative pressure exhaust dust removal system, and the negative pressure exhaust dust removal system draws out the gas after dust separation at the air outlet 23 under negative pressure to improve exhaust efficiency.

[0032] In summary, the present invention realizes the initial mixing of powder and liquid in the powder-liquid primary mixer 1 to form a powder-liquid mixture, and the powder-liquid primary mixer 1 sends the powder-liquid mixture to the powder-liquid intensive mixer 3 for secondary mixing, which greatly improves the powder-liquid mixing and dispersion effect. At the same time, the gas containing powder generated by the powder-liquid primary mixer 1 during the mixing process can be discharged from the exhaust port 113 to the powder-gas separator 2 for powder-gas separation. The separated powder flows back to the powder-liquid intensive mixer 3 through the powder discharge port 24 and the powder return port 32 of the powder-liquid intensive mixer 3 to continue to participate in the mixing of the powder-liquid mixture. The separated gas passes through the powder discharge port 24 and the powder return port 32 of the powder-liquid intensive mixer 3. The powder is discharged through the gas outlet 23, so as to avoid the waste of raw materials caused by the discharge of powder along with the gas, so that the powder content of the discharged gas is greatly reduced, and the number of subsequent manual cleaning of the rear-end dust removal equipment is reduced. The powder-gas separator 2 can balance the internal air pressure of the powder-liquid primary mixer 1, which is beneficial to reduce the design requirements for the sealing structure of the powder-liquid mixing device, and there is no need to set a filter at the place where the powder gas is generated. It can be seen that the present invention can realize the continuous mixing and stirring production of powder and liquid, and simultaneously realize the separation of powder and gas, and the separated powder is automatically reused, which reduces the waste of raw materials and reduces the overflow of dust.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A powder-liquid mixing device, characterized in that: The invention comprises a powder-liquid primary mixer, a powder-gas separator and a powder-liquid intensive mixer, wherein the powder-liquid primary mixer comprises a primary mixing shell, a conveying and mixing shaft arranged in the inner cavity of the primary mixing shell and a primary mixing driver for driving the conveying and mixing shaft to rotate, two conveying and mixing shafts are arranged in the primary mixing shell, the primary mixing driver comprises a primary mixing motor and a primary mixing gear box, the output shaft of the primary mixing motor is connected to the input end of the primary mixing gear box, the output end of the primary mixing gear box is connected to the two conveying and mixing shafts and drives the two conveying and mixing shafts to rotate in opposite directions, the conveying and mixing shaft comprises a conveying and mixing section and an exhaust section arranged in sequence along the discharging direction, the rotation direction of the spiral blades of the conveying and mixing section is consistent with the rotation direction of the spiral blades of the exhaust section The rotation directions of the slices are opposite, the powder-liquid primary mixer is provided with a primary mixing feed port, a primary mixing discharge port and an exhaust port, the primary mixing discharge port and the exhaust port are sequentially arranged at the end of the primary mixing shell along the discharge direction of the powder-liquid primary mixer, the primary mixing discharge port is located below the end of the conveying and mixing section, the powder-liquid primary mixer preliminarily mixes the liquid and powder fed through the primary mixing feed port, the powder-gas separator is provided with an air inlet, an air outlet and a powder discharge port, the powder-gas separator comprises a cylinder and an exhaust pipe, the cylinder diameter of the cylinder gradually decreases from top to bottom, the air inlet is connected to the upper side wall of the cylinder, and the air inlet is tangent to the circumferential direction of the cylinder, the exhaust pipe is arranged on the cylinder The top of the cylinder and extends into the middle of the inner cavity of the cylinder, the air outlet is located at the top of the air outlet pipe, the bottom end of the air outlet pipe is lower than the position of the air inlet, the bottom pipe opening of the air outlet pipe is inverted cone shape, the powder discharge port is arranged at the bottom of the cylinder, the exhaust port is connected with the air inlet through an exhaust pipe, the powder-liquid strong mixer is provided with a strong mixing feed port, a powder return port and a strong mixing discharge port, the powder-liquid strong mixer comprises a mixing shell, a mixing screw shaft, a mixing motor and a mixing gear box, the mixing screw shaft is provided with two, the output shaft of the mixing motor is connected with the input end of the mixing gear box, the output end of the mixing gear box is connected with the two mixing screw shafts and drives the two mixing screws The shaft rotates in the same direction in the inner cavity of the mixing shell, the primary mixing shell is mounted on the powder-liquid intensive mixer, and the primary mixing outlet is docked with the intensive mixing feed port, the powder-gas separator separates the gas containing powder into powder and gas, and the separated powder is sent to the powder return port through the powder discharge port, and the separated gas is discharged through the gas outlet, the primary mixing outlet is connected with the intensive mixing feed port, the powder discharge port is connected with the powder return port, the powder return port and the intensive mixing feed port are sequentially arranged on the top surface of the head end of the mixing shell along the discharge direction of the powder-liquid intensive mixer, and the powder-liquid intensive mixer can mix the powder-liquid mixture sent into the primary mixing outlet with the powder sent into the powder return port.

2. The powder-liquid mixing device according to claim 1, characterized in that: The conveying and mixing section includes multiple conveying sections, and the screw pitches of the multiple conveying sections decrease step by step along the discharging direction.

3. The powder-liquid mixing device according to claim 1, characterized in that: The primary mixing feed port comprises a primary mixing powder feed port and a primary mixing liquid feed port, both of which are arranged on the top surface of the head end of the primary mixing shell, and a powder feed hopper is arranged on the primary mixing powder feed port, and a plurality of powder adding ports are arranged on the powder feed hopper.

4. The powder-liquid mixing device according to claim 3, characterized in that: The primary mixing powder inlet and the primary mixing liquid inlet are sequentially arranged on the top surface of the primary mixing shell along the discharge direction of the powder-liquid primary mixer.

5. The powder-liquid mixing device according to claim 1, characterized in that: The air outlet pipe is vertically arranged at the center of the cylinder.

6. The powder-liquid mixing device according to any one of claims 1 to 5, characterized in that: The air outlet is connected to a negative pressure exhaust and dust removal system.

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