A compound premixer

Abstract

The present application relates to a kind of composite premixers, premixing mechanism includes premix barrel, stirring piece and stirring motor, bottom is provided with discharge port;Barrel cover is provided with feeding port and is provided with mounting hole in center, sealing cover is installed on feeding port, stirring motor is installed on workbench, stirring piece is located in premix barrel and its transmission end is connected in rotation in mounting hole, stirring motor is driven connection by first transmission component with the transmission end of stirring piece, the sidewall of premix barrel is provided with multiple air vents;Air mixing mechanism includes air compressor, dryer and multiple gas pipes, air compressor and dryer are all installed on workbench and are communicated by pipeline, one end of multiple gas pipes is communicated with the gas outlet of dryer, and the other end is communicated with multiple air vents correspondingly.The present application provides a kind of composite premixers, belongs to refractory production equipment technical field, composite stirring mode of mechanical stirring and wind stirring, can improve the mixing effect of dust material.

Description

TECHNICAL FIELD

[0001] The application relates to a composite premixer, and belongs to the technical field of refractory material production equipment. BACKGROUND

[0002] In the production process of refractory materials, the mixing of mud is a very important production operation link. In order to achieve different technical requirements, some raw materials need to be pre-mixed by a premixer. The mixed mud is commonly known as "pre-mixed powder or mixed powder". The premixer is an important production equipment in the production process of refractory materials. On the one hand, the premixer is used to pre-mix some superfine powder, carbon black, metal powder and magnesia powder, which is beneficial to the uniformity of the mud during mixing and improves the mixing effect of the mud. On the other hand, when flammable and explosive metal powder is added to the raw materials during mixing, it must be pre-mixed. For example, the dust density of aluminum powder at room temperature is 35-301 mg / m 3 When the mixing machine is mixed at high speed, sparks are generated by the friction and collision between the raw materials and the equipment. Aluminum powder is easy to explode when it meets a flame, which can easily cause safety accidents. Therefore, aluminum powder must be pre-mixed with other powders to improve the safety factor.

[0003] The existing premixer for refractory materials is a mechanical stirring premixer, which has the following problems: first, in order to avoid the collision and friction between the high-speed rotating stirring paddle and the raw materials, sparks are generated. The working speed of the stirring paddle or other stirring devices is relatively low, which reduces the mixing efficiency of the raw materials, reduces the production capacity, greatly wastes human and material resources, and increases the production cost; second, there is a pre-mixing dead angle, and some raw materials cannot be mixed, the mixing effect is poor, and the composition content of each mixed powder after discharge is greatly different, which reduces the product quality of the refractory materials; third, it is difficult to clean the bin, and residual materials are easily left during mixing of new products, which introduces foreign matters and reduces the product quality; fourth, the structure is single, the function is single, the degree of automation is low, the discharging speed is slow, and the working efficiency is low.

[0004] The existing technology CN210525540U high-efficiency low-speed premixer discloses that the raw materials are first poured into the barrel from the top of the premixing barrel, and then the stirring motor is started. The output shaft of the stirring motor drives the coupling to rotate, the coupling drives the stirring shaft to rotate, and then drives the anchor frame stirring paddle and the spiral blade to rotate. The anchor frame stirring paddle can stir the raw materials in the barrel to the maximum extent, thereby improving the mixing effect of the raw materials. The spiral blade can push the raw materials upwards or downwards according to the rotation direction of the stirring shaft, realize the upward and downward stirring of the raw materials, and further improve the stirring effect through the cooperation of the anchor frame stirring paddle and the spiral blade, thereby realizing high-efficiency mixing. However, the mechanical stirring premixing is not sufficient for dust materials. SUMMARY

[0005] The technical problem to be solved by the present invention is to provide a composite premixer with a composite stirring mode of mechanical stirring and wind stirring, which can improve the mixing effect of dust materials.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a composite premixer, a frame, a workbench is installed on the frame; a premixing mechanism, the premixing mechanism includes a premixing barrel, a stirring piece and a stirring motor, the premixing barrel is fixed under the workbench through a connecting frame, a barrel cover is installed on the premixing barrel, and a discharge port is provided at the bottom; a feeding port is provided on the barrel cover and a mounting hole is provided in the center, a sealing cover is installed on the feeding port, the stirring motor is installed on the workbench, the stirring piece is located in the premixing barrel and its transmission end passes through and is rotatably connected to the mounting hole, the stirring motor is transmission-connected to the transmission end of the stirring piece through a first transmission assembly, and the side wall of the premixing barrel is provided with a a plurality of ventilation holes; an air mixing mechanism, the air mixing mechanism comprising an air compressor, a dryer and a plurality of air pipes, the air compressor and the dryer are both mounted on the workbench and connected through pipes, one end of the plurality of air pipes is connected with the air outlet of the dryer, and the other end is connected with the plurality of ventilation holes; a feeding mechanism, the feeding mechanism is mounted on the workbench, and the feeding end thereof can be arranged corresponding to the feeding port; an automatic weighing mechanism, the automatic weighing mechanism is mounted on the bottom of the premixing barrel and is provided with a feeding port corresponding to the discharge port, and the automatic weighing mechanism is provided with a discharge port; a controller, the controller is electrically connected to the stirring motor, the air compressor, the dryer and the automatic weighing mechanism respectively.

[0007] The beneficial effects of the present invention are as follows: the sealing cover is opened, the material is fed into the premixing barrel from the feeding port, the stirring motor drives the stirring element through the first transmission assembly to mechanically stir and premix the material, thereby improving the mixing effect; the air compressor conveys high-pressure gas to the dryer, the dryer dries the high-pressure gas, and the high-pressure gas enters the premixing barrel through the air pipe and the ventilation hole, thereby blowing away the dusty material in the premixing barrel;

[0008] The combined use of air mixing and mechanical premixing greatly reduces the premixing time, improves work efficiency, productivity and uniform mixing effect;

[0009] Eliminates the blind spots of purely mechanical premixing, solving the problem of some raw materials not being mixed in traditional premixing mechanisms and the existence of premixing dead corners;

[0010] When cleaning the silo, it can clean the inner wall of the silo, reducing the difficulty of clearing the silo by the traditional premixing mechanism, preventing residual materials from remaining, and also increasing the switching speed when mixing different products, thereby improving work efficiency.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Further, the air mixing mechanism further comprises a connecting pipe, a ring pipe and a plurality of first branch joints, one end of the connecting pipe is communicated with the air outlet of the dryer, the other end is communicated with the ring pipe, a first valve is installed on the connecting pipe, the ring pipe is fixed on the workbench through a fixing frame and is sleeved on the top of the premix barrel, a plurality of first branch joints are connected on the ring pipe, the ring pipe is provided with air outlets corresponding to the first branch joints and is communicated, one end of each of a plurality of air conveying pipes is communicated with a plurality of first branch joints, and the other end is communicated with a plurality of air vents.

[0013] The beneficial effect of the above further scheme is that the dryer delivers dry gas into the ring pipe, a plurality of first branch joints are connected on the ring pipe, and the dry gas in the ring pipe is delivered into the premix barrel through a plurality of air conveying pipes, so that the dust material in the premix barrel is blown up and further mixed by wind energy under the premise of stirring by the stirring piece, thereby improving the mixing effect.

[0014] Further, the air mixing mechanism further comprises a plurality of second branch joints and a plurality of air injection pipes, a plurality of air conveying pipes are arranged along the height direction of the premix barrel, a plurality of second branch joints are installed at equal intervals on each air conveying pipe, a plurality of second branch joints on a plurality of air conveying pipes are divided into three layers along the height direction of the premix barrel, the air conveying pipe is provided with air outlets corresponding to the second branch joints and is communicated, one end of each of a plurality of air injection pipes is communicated with a plurality of second branch joints, and the other end is communicated with a plurality of air vents.

[0015] The beneficial effect of the above further scheme is that the second branch structure can divide the wind blown to the premix barrel into multiple layers along the height direction of the premix barrel, and mix the dust material at different heights, thereby improving the mixing effect.

[0016] Further, the air mixing mechanism further comprises a plurality of second valves, and the plurality of second valves are installed on each air conveying pipe and located between two second branch joints.

[0017] The beneficial effect of the above further scheme is that according to the amount of dust material, the number of opened second valves can be selected, thereby reducing the cost and improving the efficiency.

[0018] Further, the air mixing mechanism further comprises a gas storage tank and a water storage tank, the air outlet end of the air compressor is communicated with the gas storage tank through a pipeline, the air outlet end of the gas storage tank is communicated with the dryer through a pipeline, the water outlet of the dryer is communicated with the water storage tank through a water pipe, and the controller is electrically connected with the gas storage tank.

[0019] The beneficial effect of the further scheme is that the gas tank can control the air pressure and adjust the air pressure blowing into the premix barrel; the moisture generated in the dryer flows into the water storage tank.

[0020] Further, the stirring piece comprises a rotating shaft, a stirring frame, a scraper and a material turning device for turning the material at the bottom of the premix barrel to the top, the rotating shaft is rotationally connected to the mounting hole, the upper end of the rotating shaft is drivingly connected to the stirring motor through the first transmission assembly, and the lower end of the rotating shaft is fixedly connected to the stirring frame, the scraper is installed on the stirring frame and can slide against the inner wall of the premix barrel, the material turning device is installed on the stirring frame, and the controller is electrically connected to the material turning device.

[0021] The beneficial effect of the further scheme is that the stirring motor drives the rotating shaft to rotate, the rotating shaft drives the stirring frame to rotate, the scraper installed on the stirring frame can scrape the material on the inner wall of the premix barrel and continue to mix with other materials; the material turning device can turn the material at the bottom to the top and rotate with the stirring frame to turn all the material at the bottom of the premix barrel to the top.

[0022] Further, the premix barrel is conical, the material turning device comprises a material turning motor and a material turning spiral blade, the material turning motor is installed on the stirring frame, the material turning spiral blade is installed on the output shaft of the material turning motor, the material turning spiral blade gradually decreases from the top to the bottom of the premix barrel, and the controller is electrically connected to the material turning motor.

[0023] Further, the automatic material weighing mechanism comprises a conveying cylinder, a conveying motor, a conveying spiral blade, a weighing box and an electronic scale, the conveying cylinder is fixedly arranged at the bottom of the premix barrel and is provided with the feeding port corresponding to the discharging port, the conveying motor is installed at the higher end in the conveying cylinder, the conveying spiral blade is installed on the output shaft of the conveying motor and slide against the inner wall of the conveying cylinder, the electronic scale is installed in the weighing box, the weighing box is provided with a box opening at the top and a discharging port at the bottom, the lower end of the conveying cylinder is arranged corresponding to the box opening, and the controller is electrically connected to the conveying motor and the electronic scale.

[0024] The beneficial effect of the further scheme is that the mixed material in the premix barrel is output from the discharging port to the conveying cylinder, the conveying motor drives the conveying spiral blade to rotate and convey the material in the conveying cylinder to the weighing box, the controller pre-sets the weight, the discharging port is opened when the electronic scale weighs the material of the pre-set weight, the conveying motor stops, the material of the pre-set weight is collected and packaged.

[0025] Further, a dust collector for balancing the internal air pressure of the premix barrel and dust removal is further included, the dust collector is installed on the workbench and the dust suction end of the dust collector is in communication with the inside of the premix barrel, and the controller is electrically connected to the dust collector.

[0026] The beneficial effect of the further scheme is that the dust collector is used to extract air in the premixing barrel, balance the pressure in the premixing barrel, and the baffle is installed in the suction pipe of the dust collector, the material is blocked in the suction pipe by the baffle, and knocking the suction pipe can make the material fall into the premixing barrel.

[0027] Further, the feeding mechanism comprises a feeding motor, a shaft base, a connecting shaft, a track and a crane for hoisting the material to the feeding opening, the feeding motor and the shaft base are fixed on the workbench, the connecting shaft is rotatably connected to the shaft base and perpendicular to the workbench, the feeding motor is drivingly connected to the connecting shaft through a second transmission assembly, the track is arranged parallel to the workbench and one end of the track is fixedly connected to the top end of the connecting shaft, the crane can run along the track, and the controller is electrically connected to the feeding motor and the crane.

[0028] The beneficial effect of the further scheme is that the feeding motor drives the connecting shaft to rotate through the second transmission assembly, the direction of the track is adjusted, the crane can move along the track and hoist the material to the feeding opening, and feeding is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 It is a structural schematic view of the compound premixer;

[0030] Fig. 2 It is a schematic view of the premixing mechanism, the automatic material weighing mechanism and the belt conveyor in the compound premixer;

[0031] Fig. 3 It is a structural schematic view of the wind mixing mechanism in the compound premixer;

[0032] Fig. 4 It is a structural schematic view of the feeding mechanism in the compound premixer.

[0033] In the drawings, the components represented by the numbers are listed as follows:

[0034] 1-frame, 2-workbench, 3-premixing mechanism, 31-premixing barrel, 32-stirring piece, 321-rotating shaft, 322-stirring frame, 323-scraping plate, 324-turning device, 3241-turning motor, 3242-turning spiral blade, 33-stirring motor, 34-barrel cover, 35-sealing cover, 36-discharge port, 4-air mixing mechanism, 40-water storage tank, 41-air compressor, 42-dryer, 43-gas conveying pipe, 44-connecting pipe, 45-annular pipe, 46-first branch joint, 47-second branch joint, 48-gas injection pipe, 49-gas storage tank, 5-feeding mechanism, 51-feeding motor, 52-shaft seat, 53-rotating shaft, 54-rail, 55-crane, 6-automatic weighing mechanism, 61-conveying cylinder, 62-conveying motor, 63-conveying spiral blade, 64-weighing tank, 7-first valve, 8-belt conveyor, 9-dust collector, 10-escalator. DETAILED DESCRIPTION

[0035] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0036] The purpose of the present application is to provide a composite premixing machine to solve the problems existing in the prior art, which can add air stirring under the premise of stirring mixing by stirring rod, and improve the mixing effect of dust materials.

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The present application provides a composite premixing machine, such as Figs. 1-4As shown, the rack 1 is provided with a workbench 2; the premixing mechanism 3 comprises a premixing barrel 31, a stirring part 32 and a stirring motor 33, the premixing barrel 31 is fixed below the workbench 2 through a connecting frame, a barrel cover 34 is arranged on the premixing barrel 31, and a discharge port 36 is arranged at the bottom; the barrel cover 34 is provided with a feeding port and a mounting hole in the center, a sealing cover 35 is arranged on the feeding port, the stirring motor 33 is arranged on the workbench 2, the stirring part 32 is located in the premixing barrel 31 and the transmission end thereof is connected to the mounting hole in rotation, the stirring motor 33 is in transmission connection with the transmission end of the stirring part 32 through a first transmission assembly, and a plurality of ventilation holes are arranged in the side wall of the premixing barrel 31; the air mixing mechanism 4 comprises an air compressor 41, a dryer 42 and a plurality of air conveying pipes 43, the air compressor 41 and the dryer 42 are both arranged on the workbench 2 and are in communication through a pipeline, one end of the plurality of air conveying pipes 43 is in communication with the air outlet of the dryer 42, and the other end is in communication with the plurality of ventilation holes; the feeding mechanism 5 is arranged on the workbench 2, and the feeding end thereof is arranged correspondingly to the feeding port; the automatic weighing mechanism 6 is arranged at the bottom of the premixing barrel 31 and is provided with an inlet corresponding to the discharge port 36, and the automatic weighing mechanism 6 is provided with a discharge port; the controller is in electrical connection with the stirring motor 33, the air compressor 41, the dryer 42 and the automatic weighing mechanism 6.

[0039] The composite premixing machine provided by the application opens the sealing cover 35, inputs the material into the premixing barrel 31 from the feeding port, drives the stirring part 32 to mechanically stir and premix the material through the first transmission assembly of the stirring motor 33, improves the mixing effect, and the air compressor 41 sends high-pressure gas into the dryer 42, the dryer 42 dries the high-pressure gas, the high-pressure gas enters the premixing barrel 31 through the ventilation hole of the air conveying pipe 43, and the dust-like material in the premixing barrel 31 is blown away.

[0040] The air mixing and mechanical premixing are combined, the premixing time is greatly reduced, and the working efficiency, productivity and uniform mixing effect are improved.

[0041] The blind area of pure mechanical premixing is eliminated, the problem that part of the raw materials cannot be uniformly mixed in the traditional premixing mechanism 3 is solved, and the problem of premixing dead angle is solved.

[0042] When the stock bin is cleaned, the inner wall of the stock bin can be cleaned, the cleaning difficulty of the traditional premixing mechanism 3 is reduced, residual material is prevented, the switching speed when different products are uniformly mixed is improved, and the working efficiency is improved.

[0043] Preferably, the escalator 10 is arranged on the rack 1 and the upper end thereof is arranged correspondingly to the workbench 2.

[0044] In an embodiment of the present application, the air mixing mechanism 4 further comprises a connecting pipe 44, an annular pipe 45 and a plurality of first branch joints 46, one end of the connecting pipe 44 is in communication with the air outlet of the drying machine 42, the other end is in communication with the annular pipe 45, the first valve 7 is installed on the connecting pipe 44, the annular pipe 45 is fixed on the workbench 2 through a fixing frame and is sleeved on the top of the premixing barrel 31, the plurality of first branch joints 46 are connected to the annular pipe 45, the annular pipe 45 is provided with air outlets corresponding to the first branch joints 46 and is in communication, one end of each of the plurality of air conveying pipes 43 is in communication with the plurality of first branch joints 46, and the other end is in communication with the plurality of air vents.

[0045] The drying machine 42 delivers dry air into the annular pipe 45, the plurality of first branch joints 46 are connected to the annular pipe 45, the plurality of first branch joints 46 deliver the dry air in the annular pipe 45 into the premixing barrel 31 through the plurality of air conveying pipes 43, so that the dust material in the premixing barrel 31 is blown up and further mixed by wind energy under the premise of stirring by the stirring piece 32, and the mixing effect is improved.

[0046] In an embodiment of the present application, the air mixing mechanism 4 further comprises a plurality of second branch joints 47 and a plurality of air injection pipes 48, the plurality of air conveying pipes 43 are arranged along the height direction of the premixing barrel 31, a plurality of second branch joints 47 are installed at equal intervals on each air conveying pipe 43, the plurality of second branch joints 47 on the plurality of air conveying pipes 43 are divided into three layers along the height direction of the premixing barrel 31, the air conveying pipe 43 is provided with air outlets corresponding to the second branch joints 47 and is in communication, one end of each of the plurality of air injection pipes 48 is in communication with the plurality of second branch joints 47, and the other end is in communication with the plurality of air vents.

[0047] The second branch structure can divide the air blown to the premixing barrel 31 into multiple layers along the height direction of the premixing barrel 31, mix the dust material at different heights, and improve the mixing effect.

[0048] In an embodiment of the present application, the air mixing mechanism 4 further comprises a plurality of second valves, the plurality of second valves are installed on each air conveying pipe 43 and located between two second branch joints 47.

[0049] According to the amount of the dust material, the number of the opened second valves can be selected, the cost is reduced, and the efficiency is improved.

[0050] In an embodiment of the present application, the air mixing mechanism 4 further comprises an air tank 49 and a water tank 40, the air outlet end of the air compressor 41 is in communication with the air tank 49 through a pipeline, the air outlet end of the air tank 49 is in communication with the drying machine 42 through a pipeline, the water outlet of the drying machine 42 is in communication with the water tank 40 through a water pipe, and the controller is electrically connected with the air tank 49.

[0051] The air tank 49 can control the air pressure and adjust the air pressure of the air blown to the premixing barrel 31, and the moisture generated in the drying machine 42 flows into the water tank.

[0052] In one specific embodiment of the present application, the stirring member 32 comprises a rotating shaft 321, a stirring frame 322, a scraper 323 and a material turning device 324 for turning the material at the bottom of the premixing barrel 31 to the top, the rotating shaft 321 is rotationally connected to the mounting hole, the upper end thereof is in transmission connection with the stirring motor 33 through the first transmission assembly, and the lower end is fixedly connected with the stirring frame 322, the scraper 323 is installed on the stirring frame 322 and can slide against the inner wall of the premixing barrel 31, and the material turning device 324 is installed on the stirring frame 322 and is in electrical connection with the controller.

[0053] The stirring motor 33 drives the rotating shaft 321 to rotate, the rotating shaft 321 drives the stirring frame 322 to rotate, the scraper 323 installed on the stirring frame 322 can scrape the material on the inner wall of the premixing barrel 31 down to continue mixing with other materials, and the material turning device 324 can turn the material at the bottom up and rotate with the stirring frame 322 to turn all the material at the bottom of the premixing barrel 31 up.

[0054] In one specific embodiment of the present application, the premixing barrel 31 is conical, the material turning device 324 comprises a material turning motor 3241 and a material turning spiral blade 3242, the material turning motor 3241 is installed on the stirring frame 322, the material turning spiral blade 3242 is installed on the output shaft of the material turning motor 3241, the material turning spiral blade 3242 gradually decreases from the top to the bottom of the premixing barrel 31, and the material turning motor 3241 is in electrical connection with the controller.

[0055] In one specific embodiment of the present application, the automatic material weighing mechanism 6 comprises a conveying cylinder 61, a conveying motor 62, a conveying spiral blade 63, a weighing box 64 and an electronic scale, the conveying cylinder 61 is fixedly arranged at the bottom of the premixing barrel 31 and is provided with a feeding port corresponding to the discharging port 36, the conveying motor 62 is installed at the higher end of the conveying cylinder 61, the conveying spiral blade 63 is installed on the output shaft of the conveying motor 62 and slide against the inner wall of the conveying cylinder 61, the electronic scale is installed in the weighing box 64, the weighing box 64 is provided with a box opening at the top and a discharging port at the bottom, the lower end of the conveying cylinder 61 is arranged corresponding to the box opening, and the conveying motor 62 and the electronic scale are in electrical connection with the controller.

[0056] The mixed material in the premixing barrel 31 is output to the conveying cylinder 61 from the discharging port 36, the conveying motor 62 drives the conveying spiral blade 63 to rotate to convey the material in the conveying cylinder 61 to the weighing box 64, the controller is preset with a weight, when the electronic scale weighs the material of the preset weight, the discharging port is opened, the conveying motor 62 is stopped, and the material of the preset weight is collected and packaged.

[0057] Preferably, a belt conveyor 8 is further included, and the feeding end of the belt conveyor 8 is arranged corresponding to the discharging port.

[0058] The dust collector 9 is installed on the workbench 2 and the suction end of the dust collector 9 is communicated with the inside of the premixing barrel 31, and the controller is electrically connected with the dust collector 9.

[0059] The dust collector 9 is used for extracting air in the premixing barrel 31 and balancing the pressure in the premixing barrel 31, and a baffle is installed in the suction pipe of the dust collector 9, the material is blocked in the suction pipe by the baffle, and knocking the suction pipe can make the material fall into the premixing barrel 31.

[0060] In an embodiment of the present application, the feeding mechanism 5 comprises a feeding motor 51, a shaft seat 53, a connecting shaft, a track 54 and a crane 55 for hoisting the material to the feeding port, the feeding motor 51 and the shaft seat 53 are fixed on the workbench 2, the connecting shaft is rotatably connected to the shaft seat 53 and vertically arranged on the workbench 2, the feeding motor 51 is drivingly connected to the connecting shaft through a second transmission assembly, the track 54 is arranged parallel to the workbench 2 and one end of the track 54 is fixedly connected to the top end of the connecting shaft, the crane 55 can run along the track 54, and the controller is electrically connected with the feeding motor 51 and the crane 55.

[0061] The feeding motor 51 drives the connecting shaft to rotate through the second transmission assembly, the direction of the track 54 is adjusted, the crane 55 can move along the track 54 and hoist the material to the feeding port, and the feeding is facilitated.

[0062] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A composite premixer, characterized in that: include: A frame (1), wherein a workbench (2) is mounted on the frame (1); A premixing mechanism (3), the premixing mechanism (3) comprising a premixing barrel (31), a stirring element (32) and a stirring motor (33), the premixing barrel (31) being fixed below the workbench (2) via a connecting frame, a barrel cover (34) being installed on the premixing barrel (31), and a discharge port (36) being provided at the bottom; a feeding port being provided on the barrel cover (34) and a mounting hole being provided at the center, a sealing cover (35) being installed on the feeding port, the stirring motor (33) being installed on the workbench (2), the stirring element (32) being located in the premixing barrel (31) and having a transmission end extending through and rotatably connected to the mounting hole, the stirring motor (33) being transmission-connected to the transmission end of the stirring element (32) via a first transmission assembly, and a plurality of ventilation holes being provided on the side wall of the premixing barrel (31); An air mixing mechanism (4), the air mixing mechanism (4) comprising an air compressor (41), a dryer (42) and a plurality of air delivery pipes (43), the air compressor (41) and the dryer (42) being both mounted on the workbench (2) and connected via pipes, one end of the plurality of air delivery pipes (43) being connected to an air outlet of the dryer (42), and the other end being connected to the plurality of ventilation holes; A feeding mechanism (5), the feeding mechanism (5) is installed on the workbench (2), and its feeding end can be arranged corresponding to the feeding port; An automatic weighing mechanism (6), the automatic weighing mechanism (6) is installed at the bottom of the premix barrel (31) and has a feed port corresponding to the discharge port (36), and the automatic weighing mechanism (6) has a discharge port; a controller, the controller being electrically connected to the stirring motor (33), the air compressor (41), the dryer (42) and the automatic weighing mechanism (6); The stirring member (32) includes a rotating shaft (321), a stirring frame (322), a scraper (323) and a turner (324) for turning the material at the bottom of the premixing barrel (31) to the top. The rotating shaft (321) is rotatably connected to the mounting hole, and its upper end is transmission-connected to the stirring motor (33) through the first transmission assembly, and its lower end is fixedly connected to the stirring frame (322). The scraper (323) is installed on one side of the stirring frame (322) and slides against the inner wall of the premixing barrel (31). The turner (324) is installed on the other side of the stirring frame (322) away from the scraper (323) and close to the inner wall of the premixing barrel (31). The controller is electrically connected to the turner (324). The premix barrel (31) is conical, and the material turner (324) includes a material turning motor (3241) and a material turning spiral blade (3242). The material turning motor (3241) is installed on the stirring frame (322), and the material turning spiral blade (3242) is installed on the output shaft of the material turning motor (3241). The material turning spiral blade (3242) gradually decreases from the top to the bottom of the premix barrel (31). The controller is electrically connected to the material turning motor (3241); The invention also includes a dust collector (9) for extracting air from the premixing barrel to balance the internal air pressure of the premixing barrel (31) and for removing dust. The dust collector (9) is installed on the workbench (2) and its dust collection end is connected to the interior of the premixing barrel (31). A baffle for blocking materials is installed in the suction pipe of the dust collector (9). When the suction pipe is knocked, the material in the suction pipe can fall into the premixing barrel. The controller is electrically connected to the dust collector (9).

2. A composite premixer according to claim 1, characterized in that: The air mixing mechanism (4) further comprises a connecting pipe (44), an annular pipe (45) and a plurality of first branch joints (46); one end of the connecting pipe (44) is communicated with the air outlet of the dryer (42), and the other end is communicated with the annular pipe (45); a first valve (7) is installed on the connecting pipe (44); the annular pipe (45) is fixed to the workbench (2) through a fixing frame and is sleeved on the top of the premixing barrel (31); a plurality of first branch joints (46) are connected to the annular pipe (45); air outlet holes are opened at the annular pipe (45) corresponding to the first branch joints (46) and are communicated; one end of the plurality of air delivery pipes (43) is communicated with the plurality of first branch joints (46) in a one-to-one correspondence, and the other end is communicated with the plurality of ventilation holes.

3. A composite premixer according to claim 2, characterized in that: The air mixing mechanism (4) further comprises a plurality of second branch joints (47) and a plurality of air jet pipes (48). The plurality of air delivery pipes (43) are arranged along the height direction of the premixing barrel (31). A plurality of second branch joints (47) are installed at equal intervals on each of the air delivery pipes (43). The plurality of second branch joints (47) on the plurality of air delivery pipes (43) are divided into three layers along the height direction of the premixing barrel (31). Exhaust holes are opened at the air delivery pipes (43) corresponding to the second branch joints (47) and are connected. One end of the plurality of air jet pipes (48) is connected to the plurality of second branch joints (47), and the other end is connected to the plurality of ventilation holes.

4. A composite premixer according to claim 3, characterized in that: The air mixing mechanism (4) further comprises a plurality of second valves, which are installed on each of the air delivery pipes (43) and are located between two of the second branch joints (47).

5. A composite premixer according to any one of claims 1 to 4, characterized in that: The air mixing mechanism (4) further includes an air storage tank (49) and a water storage tank (40); the air outlet of the air compressor (41) is connected to the air storage tank (49) through a pipeline; the air outlet of the air storage tank (49) is connected to the dryer (42) through a pipeline; the drain outlet of the dryer (42) is connected to the water storage tank (40) through a water pipe; and the controller is electrically connected to the air storage tank (49).

6. A composite premixer according to claim 1, characterized in that: The automatic weighing mechanism (6) comprises a conveying cylinder (61), a conveying motor (62), a conveying spiral blade (63), a weighing box (64) and an electronic scale. The conveying cylinder (61) is arranged obliquely and fixed at the bottom of the premixing barrel (31) and is provided with the feed port corresponding to the discharge port (36). The conveying motor (62) is installed at the higher end of the conveying cylinder (61). The conveying spiral blade (63) is installed on the output shaft of the conveying motor (62) and is in sliding contact with the inner wall of the conveying cylinder (61). The electronic scale is installed in the weighing box (64). The weighing box (64) is provided with a box opening at the top and the discharge port at the bottom. The lower end of the conveying cylinder (61) is arranged corresponding to the box opening. The controller is electrically connected to the conveying motor (62) and the electronic scale.

7. A composite premixer according to claim 6, characterized in that: The feeding mechanism (5) includes a feeding motor (51), an axle seat (52), a connecting shaft (53), a track (54) and a crane (55) for lifting materials to the feeding port, wherein the feeding motor (51) and the axle seat (52) are fixed on the workbench (2), the connecting shaft (53) is rotatably connected to the axle seat (52) perpendicular to the workbench (2), the feeding motor (51) is connected to the connecting shaft (53) through a second transmission assembly, the track (54) is arranged parallel to the workbench (2) and one end is fixedly connected to the top end of the connecting shaft (53), the crane (55) can run along the track (54), and the controller is electrically connected to the feeding motor (51) and the crane (55).

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