Vortex airflow-assisted high-speed stirrer

Abstract

The utility model discloses a vortex airflow assisted high-speed stirrer which comprises a bracket, a feed hopper, a mixing barrel, a conveying barrel, a screw rod, a first motor, a stirring shaft, stirring blades, an air inlet, a second motor, a discharge hole, a receiving box and an observation hole. The high-pressure airflow spray head is arranged at the air inlet, high-pressure airflow in the same direction as the rotating direction of the stirring blades is sprayed in the angle directions including 0 degree, 15 degrees, 30 degrees, 45 degrees, 60 degrees and 90 degrees, and the stirring blades are pushed to rotate at a higher speed; the accelerated rotation of the stirring blades also drives the high-pressure air flow to rotate in an accelerated manner, the rotation speed of the stirring blades is higher due to the repeated superposition effect, and the high-pressure air flow forms vortex air flow under the action of the stirring blades. High-pressure air flow and subsequently formed vortex air flow enable the raw materials to be mixed more uniformly and fully, so that the mixing characteristic of the high-pressure air flow is better exerted and utilized; and the stirring and mixing process time is shortened to 0.5-1 h.

Description

Technical Field

[0001] The utility model relates to the technical field of mixers for engineering plastics, in particular to a high-speed mixer assisted by eddy current airflow. Background Art

[0002] Engineering plastics have excellent comprehensive properties, light weight, high specific strength, outstanding friction reduction and wear resistance, high rigidity, small creep, good heat and cold resistance, good corrosion resistance, good electrical insulation, and can be used for a long time in harsh chemical and physical environments. They can replace metals as engineering structural materials and are increasingly used.

[0003] In the entire processing and molding process of engineering plastics, the mixing of raw materials is the basic process at the front end of the process. The uniformity and sufficiency of the raw material mixing will directly affect the final performance of the engineering plastics. Therefore, people are still pursuing the research and development of mixers. With the deepening and development of research and development, higher requirements and challenges are put forward for the mixing equipment and process technology of raw materials. For engineering plastics, the mixing mixer mainly uses high-speed rotating mixing blades to stir or flip the raw materials to achieve the mixing and homogenization of the raw materials. With the development of science and technology, a variety of improved and / or hybrid mixing and preparation technologies and methods have been developed and promoted.

[0004] Patent CN117599669 A discloses a high-speed mixer, including a mixing barrel, a tumbling assembly, a shearing assembly, a first driving member and a second driving member, wherein the tumbling assembly and the shearing assembly are driven to rotate separately by the first driving member and the second driving member respectively. The tumbling assembly at the bottom can rotate at a medium-low first speed, while the shearing assembly at the top can rotate at a higher second speed, so as to meet the requirements of mixing and dispersing different materials and improve compatibility.

[0005] Patent CN108816111A discloses a high-speed powder mixer, including a cylinder, a cover, a high-pressure gas pulse ejector, etc. The nozzle of the high-pressure gas pulse ejector can eject high-pressure gas at multiple angles. The ejected high-pressure gas impacts the powder on the inner wall of the cylinder, which can effectively blow off the adhering powder, making the material mixing more even, making the powder consistent, and can greatly reduce the number of times the cylinder is cleaned, saving time and effort.

[0006] From the above information, it can be seen that in traditional or existing technologies, high-pressure gas is generally used to participate in the stirring and mixing of plastic raw materials or powders, but there are the following problems:

[0007] 1. The high-pressure airflow only plays the role of blowing, impacting and increasing the chance of collision between particles, and its auxiliary mixing characteristics of high-pressure airflow have not been better utilized;

[0008] 2. In order to ensure the effect of full and uniform mixing, the stirring, mixing and preparation process takes a long time, usually more than 2 hours. Summary of the invention

[0009] The utility model aims to solve the deficiencies of the prior art and to provide a vortex airflow assisted high-speed mixer.

[0010] In order to achieve the above object, the utility model provides the following technical solutions:

[0011] A vortex airflow assisted high-speed mixer mainly comprises a bracket, a feed hopper, a mixing barrel, a conveying barrel, a screw, a first motor, a stirring shaft, stirring blades, an air inlet, a second motor, a discharge port, a material receiving box and an observation port.

[0012] The bracket is supported by 4 sub-brackets erected from bottom to top, the bottoms of the 4 sub-brackets are welded together in a square shape by support plates, and the 4 sub-brackets are symmetrically distributed at 90° along the center of the square;

[0013] A feed hopper is arranged at the center of the bottom of the high-speed mixer. The feed hopper is in the shape of an inverted triangular cone and is welded and fixed to the sub-brackets with a support plate; a mixing barrel is arranged directly above the feed hopper. The mixing barrel is cylindrical and the top of the mixing barrel is welded and connected to the four sub-brackets of the bracket to support the mixing barrel.

[0014] A feeding cylinder is arranged at the tip of the inverted triangular cone at the bottom of the feed hopper. The feeding cylinder is cylindrical and extends upward from the bottom of the feed hopper to 20-50 mm from the top of the mixing cylinder. A screw is arranged inside the feeding cylinder. The screw fits tightly with the inner wall of the feeding cylinder. The screw extends from the bottom of the feeding cylinder to the top of the mixing cylinder. A first motor is arranged on the outside of the top of the mixing cylinder. The first motor is fixed on the side wall of the mixing cylinder. The screw is connected to the driving shaft of the first motor through a belt through a transfer structure.

[0015] At the bottom of the mixing cylinder, with the central axis of the mixing cylinder as the center, a number of stirring shafts symmetrically and evenly distributed are set in the circumferential direction at the inner wall of the mixing cylinder and the midpoint of the feeding cylinder. The stirring shafts are upright round rods extending from bottom to top to a distance of 50-100 from the horizontal line of the top of the feeding cylinder. mm, several layers of stirring blades are evenly distributed along the axial direction of the stirring shaft at equal distances, and in the direction perpendicular to the axial direction of the stirring shaft, the stirring blades are evenly and symmetrically distributed along the axis of the stirring shaft, and the stirring blades are tightly fitted with the inner wall of the mixing barrel and the outer wall of the feeding barrel, and the stirring blades are connected and fixed to the stirring shaft by a sleeve; several layers of air inlets are arranged on the outer wall of the mixing barrel, and each layer of the air inlets is evenly distributed in the circumferential direction, and the air inlets are evenly distributed from bottom to top along the outer wall of the mixing barrel, and the positions correspond to the stirring blades; a second motor is arranged on the side wall of the bracket, and the second motor is welded and fixed to the bracket, and the stirring shaft is connected to the driving shaft of the second motor through the sleeve by a belt; a discharge port is opened in the middle of the bottom of the mixing barrel near the feeding barrel, and a discharge control valve is arranged at the discharge port; a material receiving box is arranged on the side of the bracket, and is connected to the discharge port through a discharge pipe; an observation port is arranged on the middle outer wall of the mixing barrel.

[0016] Preferably, a high-pressure airflow nozzle is installed at the air inlet, and the high-pressure airflow nozzle is a semi-spherical hollow structure, and a plurality of air outlet holes are evenly distributed on the outer wall of the high-pressure airflow nozzle; the high-pressure airflow nozzle is connected to the air compressor by a high-pressure gas delivery pipe. Taking the shear direction of the inner wall of the mixing barrel as the 0° reference, the high-pressure airflow nozzle can spray high-pressure airflow in the same direction as the rotation direction of the stirring blade at angles including 0°, 15°, 30°, 45°, 60°, and 90°.

[0017] By adopting the above technical solution, the high-pressure airflow nozzle sprays high-pressure airflow in the same direction as the rotation direction of the stirring blade at angles including 0°, 15°, 30°, 45°, 60°, and 90°, driving the stirring blade to rotate at a higher and faster speed; the accelerated rotation of the stirring blade also drives the high-pressure airflow to accelerate rotation, and the repeated superposition effect makes the rotation speed of the stirring blade faster and higher, and the high-pressure airflow forms a vortex airflow under the action of the stirring blade. The high-pressure airflow and the vortex airflow formed subsequently can blow and / or take away the raw materials adhered to the inner wall of the mixing barrel and the stirring blade, so that they continue to participate in the high-speed stirring and mixing process, and further make the raw materials mixed more uniformly and fully.

[0018] Preferably, the number of the stirring shafts is 4.

[0019] Only by adopting the above technical solution can it be ensured that the stirring and eddy flow areas of the stirring blades can cover the entire horizontal plane area inside the mixing barrel, so as to avoid blind areas or dead corners of stirring.

[0020] Preferably, the feed hopper, mixing barrel, conveying barrel, screw, stirring shaft, stirring blades and air inlet are all symmetrically arranged with the central axis of the mixing barrel as the center of the circle.

[0021] Preferably, the connection structure between the screw and the first motor is a screw sleeve sleeved on the central axis of the screw, the screw sleeve and the screw are connected by gear engagement, and the screw sleeve and the driving shaft of the first motor are connected by a belt.

[0022] Preferably, the stirring blades are of a multi-layer structure, and the stirring blades at the bottom layer are provided with a brush, and the bristles of the brush are downwardly directed toward the bottom, closely fitting the bottom of the mixing barrel.

[0023] By adopting the above technical solution, the brush can clean the bottom of the mixing barrel, thereby preventing the accumulation of raw materials at the bottom of the mixing barrel, and at the same time allowing the raw materials to continue to participate in the stirring and mixing process under the action of the vortex airflow, further making the raw materials mixed more uniformly and fully; in addition, it can help the raw materials to be discharged from the discharge port faster.

[0024] Preferably, the discharge port is an elongated rectangular strip along the radial direction.

[0025] With the above technical solution, the brush cleans the bottom of the mixing barrel, and the long rectangular strip along the radial direction facilitates the discharge of the raw materials from the discharge port.

[0026] Preferably, the stirring blades are of a rotary vane structure, and the number of stirring blades on each layer is 4 or 3.

[0027] Preferably, a baffle is hingedly connected to the observation port; a hook is fixed to the side of the baffle away from the mixing barrel, a clamping rod is hingedly connected to the outer wall of the mixing barrel, and a hanging ring that cooperates with the hook is hingedly connected to one end of the clamping rod close to the mixing barrel.

[0028] The above technical solution is adopted to set the observation port to facilitate the staff to observe the mixing status of the materials in the mixing barrel, and to facilitate cleaning the inside of the mixing barrel to keep the inside of the mixing barrel clean; the baffle door can close the observation port, so as not to affect the normal operation of the mixing barrel. The baffle door is locked to the side wall of the mixing barrel by using the hasp of the hanging ring and the hook, and then the hanging ring is pressed by the pressing rod.

[0029] Preferably, a vent hole is provided at the top middle of the mixing cylinder and at the top of the screw, and the inner diameter of the vent hole is 10-20 mm smaller than the inner diameter of the feeding cylinder.

[0030] In summary, the beneficial technical effects of the utility model are:

[0031] By arranging a high-pressure airflow nozzle at the air inlet, a high-pressure airflow in the same direction as the rotation direction of the stirring blade is ejected at angles including 0°, 15°, 30°, 45°, 60°, and 90°, so as to drive the stirring blade to rotate at a higher and faster speed; the accelerated rotation of the stirring blade also drives the accelerated rotation of the high-pressure airflow, and the repeated superposition effect makes the rotation speed of the stirring blade faster and higher, and the high-pressure airflow forms a vortex airflow under the action of the stirring blade. The high-pressure airflow and the vortex airflow formed subsequently can blow and / or take away the raw materials adhered to the inner wall of the mixing barrel and the stirring blade, so that they continue to participate in the high-speed stirring and mixing process, and further make the raw materials mixed more uniformly and fully. The utility model makes better use of the mixing characteristics of the high-pressure airflow; shortens the stirring and mixing process time to 0.5 h-1 h; and can blow away the raw materials adhered to the inner wall of the mixing barrel and the stirring blade at the same time, without causing waste of materials, and can greatly reduce the number of cleaning and washing, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0033] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0034] Figure 1 The utility model provides a schematic cross-sectional structure diagram of a vortex airflow assisted high-speed mixer.

[0035] Figure 1 Shown in: 1. bracket, 2. feed hopper, 3. mixing barrel, 4. conveying barrel, 5. screw, 6. first motor, 7. stirring shaft, 8. stirring blade, 9. air inlet, 10. second motor, 11. discharge port, 12. receiving box, 13. observation port. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The terms such as "left", "right", "upper", "lower" etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships shall be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0038] Reference Figure 1 The utility model discloses a vortex airflow assisted high-speed mixer, comprising a bracket 1, a feed hopper 2, a mixing barrel 3, a conveying barrel 4, a screw 5, a first motor 6, a stirring shaft 7, a stirring blade 8, an air inlet 9, a second motor 10, a discharge port 11, a material receiving box 12 and an observation port 13.

[0039] The utility model is provided with a high-pressure air flow nozzle at the air inlet 9 .

[0040] The high-pressure airflow ejected by the high-pressure airflow nozzle at a small angle (0°, 15°, 30°, 45°) is mainly blown toward the outer end of the stirring blade 8, and its driving force on the stirring blade 8 is mainly generated at the outer end of the stirring blade 8, so as to drive the stirring blade 8 to rotate at a higher and faster speed; at the same time, the high-pressure airflow and the subsequently formed vortex airflow can blow and / or take away the raw materials adhered to the inner wall of the mixing barrel 3 and the outer end of the stirring blade 8, so that they continue to participate in the high-speed stirring and mixing process, and further make the raw materials mixed more uniformly and fully.

[0041] The high-pressure airflow ejected by the high-pressure airflow nozzle at a wide angle (0°, 15°, 30°, 45°, 60°, 90°) is mainly blown toward the outer end and the inner end of the stirring blade 8, that is, the stirring blade 8 as a whole; its driving force on the stirring blade 8 is also mainly generated on the stirring blade 8 as a whole, so as to drive the stirring blade 8 to rotate at a higher and faster speed; at the same time, the high-pressure airflow and the subsequently formed vortex airflow can blow and / or take away the raw materials adhered to the inner wall of the mixing barrel 3 and the stirring blade 8 as a whole, so that they continue to participate in the high-speed stirring and mixing process, and further make the raw materials mixed more uniformly and fully.

[0042] In the early stage of stirring and mixing, the high-pressure airflow nozzle sprays high-pressure airflow in a small angle (0°, 15°, 30°, 45°) direction, which mainly plays the role of stirring, dispersing and mixing; in the later and final stages of stirring and mixing, the high-pressure airflow nozzle sprays high-pressure airflow in a wide angle (0°, 15°, 30°, 45°, 60°, 90°) direction, which not only plays the role of stirring, dispersing and mixing, but also plays the role of cleaning the stirring blades 8, the stirring shaft 7, the outer wall of the feeding barrel 4 and the inner wall of the mixing barrel 3, without causing waste of materials, and can greatly reduce the number of cleaning times, saving time and effort.

[0043] The working process and steps of the utility model are as follows:

[0044] 1. The raw materials enter from the feed hopper 2 and are pushed upward by the screw 5 along the conveying tube 4, spirally ascending continuously. During this process, the raw materials undergo the first round of stirring, dispersion and mixing;

[0045] 2. The raw material reaches the top of the feeding cylinder 4, falls in an umbrella-like manner, and reaches the first layer of stirring blades 8;

[0046] 3. Under the centrifugal force of the rotating first layer of stirring blades 8, the raw materials are thrown onto the inner wall of the mixing barrel 3 in a parabolic centrifugal manner;

[0047] 4. Under the action of the high-pressure airflow ejected from the high-pressure airflow nozzle at a small angle (0°, 15°, 30°, 45°) and the generated vortex airflow, the raw materials are blown back or brought back to the second layer of stirring blades 8;

[0048] 5. Under the centrifugal force of the rotating second layer of stirring blades 8, the raw materials are thrown onto the inner wall of the mixing barrel 3 in a parabolic centrifugal manner;

[0049] 6. Under the action of the high-pressure airflow ejected from the high-pressure airflow nozzle and the generated vortex airflow, the raw materials are blown back or brought back to the third layer of stirring blades 8;

[0050] 7. Repeat steps 3 and 4, or steps 5 and 6, until the raw materials reach the stirring blade 8 at the bottom layer;

[0051] 8. Under the centrifugal force of the rotating stirring blades 8 at the bottom layer, the raw materials are thrown onto the inner wall of the mixing cylinder 3 in a parabolic centrifugal manner;

[0052] 9. Under the action of the high-pressure airflow ejected from the high-pressure airflow nozzle and the generated vortex airflow, the raw materials are blown back or brought back to the bottom of the mixing barrel 3;

[0053] 10. Under the rotating scrubbing action of the brush on the stirring blade 8 at the bottom layer, and the mixing action of the high-pressure airflow ejected from the high-pressure airflow nozzle and the generated vortex airflow, the raw materials are brushed up from the bottom of the mixing barrel 3, and continue to be stirred and mixed inside the mixing barrel 3 until the raw materials no longer need to be mixed;

[0054] 11. The high-pressure airflow nozzle sprays high-pressure airflow at a wide angle (0°, 15°, 30°, 45°, 60°, 90°), opens the discharge control valve of the discharge port 11, and under the rotating scrubbing action of the brush on the bottom stirring blade 8, the raw materials flow out from the discharge port 11 and enter the receiving box 12 through the discharge pipe.

[0055] Of course, the embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A vortex airflow assisted high-speed mixer, characterized in that: The invention mainly comprises a support (1), a feed hopper (2), a mixing cylinder (3), a conveying cylinder (4), a screw (5), a first motor (6), a stirring shaft (7), a stirring blade (8), an air inlet (9), a second motor (10), a discharge port (11), a material receiving box (12) and an observation port (13); The support (1) is supported by four sub-supports erected from bottom to top, the bottoms of the four sub-supports are welded together in a square shape by support plates, and the four sub-supports are symmetrically distributed at 90° along the center of the square; A feed hopper (2) is arranged at the center of the bottom of the high-speed mixer. The feed hopper (2) is in the shape of an inverted triangular cone. The feed hopper (2) is welded and fixed to the sub-bracket by a support plate. A mixing cylinder (3) is arranged directly above the feed hopper (2). The mixing cylinder (3) is cylindrical. The top of the mixing cylinder (3) is welded and connected to the four sub-brackets of the bracket (1) to support the mixing cylinder (3). A feeding barrel (4) is arranged at the tip of the inverted triangular cone at the bottom of the feeding hopper (2). The feeding barrel (4) is cylindrical and extends upward from the bottom of the feeding hopper (2) to a position 20-50 mm from the top of the inside of the mixing barrel (3). A screw (5) is arranged inside the feeding barrel (4). The screw (5) is tightly fitted with the inner wall of the feeding barrel (4). The screw (5) extends from the bottom of the feeding barrel (4) to the top of the inside of the mixing barrel (3). A first motor (6) is arranged on the outside of the top of the mixing barrel (3). The first motor (6) is fixed to the side wall of the mixing barrel (3). The screw (5) is connected to the driving shaft of the first motor (6) through a belt through a transfer structure. At the bottom of the mixing cylinder (3), with the central axis of the mixing cylinder as the center, a plurality of stirring shafts (7) symmetrically and evenly distributed are set in the circumferential direction at the inner wall of the mixing cylinder (3) and the midpoint of the feeding cylinder (4). The stirring shafts (7) are upright round rods extending from bottom to top to a horizontal line 50-100° away from the top of the feeding cylinder (4). mm, a plurality of layers of stirring blades (8) are evenly distributed along the axial direction of the stirring shaft (7) at equal distances, and in a direction perpendicular to the axial direction of the stirring shaft (7), the stirring blades (8) are evenly and symmetrically distributed along the axis of the stirring shaft (7), and the stirring blades (8) are tightly fitted with the inner wall of the mixing barrel (3) and the outer wall of the feeding barrel (4), and the stirring blades (8) and the stirring shaft (7) are connected and fixed by a sleeve; a plurality of layers of air inlets (9) are arranged on the outer wall of the mixing barrel (3), and each layer of the air inlets (9) is evenly distributed in the circumferential direction, and the air inlets (9) are arranged along the outer wall of the mixing barrel (3) from bottom to top. The second motor (10) is arranged on the side wall of the bracket (1), and the second motor (10) is welded and fixed on the bracket (1). The stirring shaft (7) is connected to the driving shaft of the second motor (10) through a sleeve by a belt; a discharge port (11) is provided in the middle of the bottom of the mixing barrel (3) near the feeding barrel (4), and a discharge control valve is provided at the discharge port (11); a material receiving box (12) is provided on the side of the bracket (1), and is connected to the discharge port (11) through a discharge pipe; an observation port (13) is provided on the middle outer wall of the mixing barrel (3).

2. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: A high-pressure airflow nozzle is installed at the air inlet (9), and the high-pressure airflow nozzle is a semi-spherical hollow structure, and a plurality of air outlet holes are evenly distributed on the outer wall of the high-pressure airflow nozzle; the high-pressure airflow nozzle is connected to the air compressor by a high-pressure gas delivery pipe; with the shear direction of the inner wall of the mixing barrel (3) as a 0° reference, the high-pressure airflow nozzle can spray high-pressure airflow in the same direction as the rotation direction of the stirring blade (8) at angles including 0°, 15°, 30°, 45°, 60°, and 90°.

3. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: The number of the stirring shafts (7) is 4.

4. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: The feed hopper (2), mixing cylinder (3), conveying cylinder (4), screw (5), stirring shaft (7), stirring blade (8) and air inlet (9) are all arranged symmetrically about the central axis of the mixing cylinder (3) with the central axis as the center of the circle.

5. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: The connection structure between the screw (5) and the first motor (6) is a screw sleeve sleeved on the central axis of the screw (5); the screw sleeve and the screw (5) are connected by gear engagement; and the screw sleeve and the driving shaft of the first motor (6) are connected by a belt.

6. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: The stirring blades (8) are of a multi-layer structure, and the stirring blades (8) at the bottom layer are provided with a brush, and the hairs of the brush are downwardly directed toward the bottom, so as to fit closely to the bottom of the mixing barrel (3).

7. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: The discharge port (11) is in the shape of an elongated rectangle along the radial direction.

8. The vortex airflow assisted high-speed mixer according to claim 1, characterized in that: The stirring blades (8) are of a rotary vane structure, and the number of stirring blades (8) on each layer is 4 or 3.

9. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: A baffle is hingedly connected to the observation port (13); a hook is fixed to the side of the baffle away from the mixing barrel (3); a clamping rod is hingedly connected to the outer wall of the mixing barrel (3); and a hanging ring that cooperates with the hook is hingedly connected to the end of the clamping rod close to the mixing barrel (3).

10. A vortex airflow assisted high-speed mixer according to claim 1, characterized in that: An exhaust hole is provided at the top middle of the mixing cylinder (3) and at the top of the screw (5), and the inner diameter of the exhaust hole is 10-20 mm smaller than the inner diameter of the conveying cylinder (4).

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