Material mixing device

Abstract

This application relates to a material mixing device. The material mixing device includes a material cylinder, a stirring shaft, a stirring head assembly, and a negative pressure generating mechanism. The material cylinder is used to contain the material to be mixed. The stirring shaft is installed in the material cylinder, with its end extending to the bottom of the material cylinder and having a stirring head assembly at that end. The negative pressure generating mechanism is installed on the stirring shaft and located above the stirring head assembly. The internal space of the material cylinder includes a positive pressure vortex zone formed by the centrifugal force of the stirring head assembly and a negative pressure zone formed by the negative pressure generating mechanism. The pressure difference between the positive pressure vortex zone and the negative pressure zone drives the material to circulate within the material cylinder. The material mixing device provided by this application can increase the exchange rate of material in different regions within the material cylinder through the pressure difference, thereby improving the material mixing uniformity and mixing rate.

Description

Technical Field

[0001] This application relates to the field of material mixing technology, and more particularly to material mixing devices. Background Technology

[0002] A material mixing device is an industrial equipment that mixes materials through mechanical action and is widely used in chemical, food, and pharmaceutical industries. Its core function lies in using the shear force and convection generated by rotating stirring elements to promote the uniform dispersion of different component materials.

[0003] However, the material mixing devices of the related technologies have the following drawbacks: On the one hand, the material mixing devices of the related technologies generate a positive pressure vortex zone at the mixing head, and the material forms a closed circulation in the positive pressure vortex zone, resulting in severe material stratification and poor material mixing efficiency; on the other hand, the material mixing devices of the related technologies are prone to forming viscous accumulation on the cylinder wall, resulting in insufficient material mixing uniformity and difficulty in increasing the mixing speed.

[0004] Therefore, it is necessary to propose a device that can autonomously regulate the pressure distribution of the flow field inside the barrel, thereby improving the uniformity and speed of material mixing. Utility Model Content

[0005] To solve or partially solve the problems existing in the related technologies, this application provides a material mixing device that can increase the exchange rate of materials in different areas of the material cylinder through pressure difference, thereby improving the material mixing uniformity and mixing rate.

[0006] This application provides a material mixing device, comprising:

[0007] A mixing drum is used to hold the material being mixed.

[0008] A stirring spindle is installed in the material cylinder, and the end of the stirring spindle extends to the bottom of the material cylinder, and the end is provided with a stirring head assembly;

[0009] A negative pressure generating mechanism is installed on the stirring spindle and located above the stirring head assembly;

[0010] The internal space of the material cylinder includes a positive pressure vortex zone formed by the centrifugal action of the stirring head assembly and a negative pressure zone formed by the negative pressure generating mechanism. The pressure difference between the positive pressure vortex zone and the negative pressure zone is used to drive the material to circulate in the material cylinder.

[0011] In one implementation, the negative pressure generating mechanism is located near the center of the stirring spindle, and the rotation plane of the negative pressure generating mechanism is perpendicular to the axial direction of the stirring spindle.

[0012] In one implementation, a material viscous zone is formed inside the barrel, and a pressure difference is formed between the positive pressure vortex zone and the negative pressure zone to drive the material to circulate between the positive pressure vortex zone, the material viscous zone and the negative pressure zone.

[0013] In one implementation, the axial direction of the material cylinder is parallel to the axial direction of the stirring main shaft and has a set distance; the rotation diameter of the stirring head assembly is greater than the radius of the material cylinder.

[0014] In one implementation, the negative pressure generating mechanism includes a plurality of blades fixed to the stirring spindle and arranged circumferentially around the stirring spindle, the plurality of blades having an inclination angle of a set angle value.

[0015] In one implementation, the stirring head assembly includes a disc fixed to the end of the stirring spindle, the disc being coaxially arranged with the stirring spindle and parallel to the rotation plane of the negative pressure generating mechanism; the disc extending from the disc surface has a plurality of stirring teeth.

[0016] In one implementation, the plurality of stirring teeth are spaced apart along the rotation direction of the disc.

[0017] In one implementation, the material cylinder has a bottom wall, the disc of the stirring head assembly is close to the bottom wall and a gap is formed between them, and the bottom wall has a discharge port.

[0018] In one implementation, the material cylinder is provided with a top cover, the stirring spindle is rotatably mounted on the top cover, the drive source is fixed relative to the top cover, and the power output end of the drive source is connected to the stirring spindle for transmission.

[0019] A sealing element is provided between the material cylinder and the top cover.

[0020] The technical solution provided in this application may include the following beneficial effects:

[0021] The material mixing device provided in this application includes a positive pressure vortex zone formed by the centrifugal action of the mixing head assembly and a negative pressure zone formed by the negative pressure generating mechanism. It can autonomously regulate the pressure distribution of the flow field inside the material cylinder. The pressure difference between the positive pressure vortex zone and the negative pressure zone is used to drive the material to circulate in a directional manner within the material cylinder, preventing the material from being trapped in the positive pressure vortex zone, reducing material viscosity, and thereby increasing the exchange rate of the material in different regions of the material cylinder through the pressure difference, thereby improving the material mixing uniformity and mixing rate.

[0022] Furthermore, in the material mixing device of this application, a material viscous zone is formed inside the material cylinder. The positive pressure vortex zone and the negative pressure zone form a pressure difference to drive the material to circulate between the positive pressure vortex zone, the material viscous zone and the negative pressure zone, so that the material in the material cylinder flows in a directional manner, which can further reduce the caking or retention of the material in the viscous zone and further improve the dispersion effect of the material.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0025] Figure 1 This is a schematic diagram of the structure of a material stirring device according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of the stirring shaft of a material stirring device according to an embodiment of this application.

[0027] Figure label:

[0028] 100. Cylinder; 101. Cylinder wall; 102. Bottom wall; 103. Top cover; 104. Drive source; 105. Bearing seat; 106. Transmission mechanism; 110. Stirring shaft; 120. Negative pressure generating mechanism; 121. Blade; 130. Stirring head assembly; 131. Disc; 132. Stirring teeth; 140. Discharge port; 200. Base; A. Positive pressure vortex zone; B. Negative pressure zone; C. Viscous zone. Detailed Implementation

[0029] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0030] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] Material mixing devices in related technologies often fail to achieve proper exchange between the inner and outer layers of the material, leading to viscous buildup on the cylinder wall and resulting in insufficient mixing uniformity and difficulty in increasing the mixing speed. To address these issues, this application provides a material mixing device that can improve both the mixing uniformity and the mixing speed.

[0035] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the structure of a material stirring device shown in one embodiment of this application.

[0037] See Figure 1This application provides a material mixing device, which includes a material cylinder 100, a mixing main shaft 110, a mixing head assembly 130, and a negative pressure generating mechanism 120. The material cylinder 100 is used to contain the material to be mixed. The mixing main shaft 110 is installed in the material cylinder 100, and the end of the mixing main shaft 110 extends to the bottom of the material cylinder 100, with the mixing head assembly 130 provided at the end. The negative pressure generating mechanism 120 is installed in the mixing main shaft 110 and is located above the mixing head assembly 130. The internal space of the material cylinder 100 includes a positive pressure vortex zone A formed by the centrifugal action of the mixing head assembly 130 and a negative pressure zone BB formed by the negative pressure generating mechanism 120. The positive pressure vortex zone A and the negative pressure zone B form a pressure difference to drive the material to circulate in the material cylinder 100.

[0038] The material mixing device provided in this application includes a positive pressure vortex zone A formed by the centrifugal action of the mixing head assembly 130 and a negative pressure zone B formed by the negative pressure generating mechanism 120. It can autonomously regulate the pressure distribution of the flow field inside the material cylinder 100. The pressure difference between the positive pressure vortex zone A and the negative pressure zone B is used to drive the material to circulate in a directional manner within the material cylinder 100, avoiding the material from being trapped in the positive pressure vortex zone A, reducing material viscosity, and thereby increasing the exchange rate of the material in different regions through the pressure difference, thereby improving the material mixing uniformity and mixing rate.

[0039] In some embodiments, the material cylinder 100 can be a hollow cylindrical material cylinder 100, which can be formed of metal material, and the material cylinder 100 can be vertically installed on the base 200. The top end of the stirring spindle 110 is connected to the power output end of the drive source 104, which can be a motor. The motor is installed horizontally on the top of the material cylinder 100 and is connected to the stirring spindle through a right-angle speed change mechanism. The stirring head assembly 130 is installed at the bottom (or end) of the stirring spindle 110 away from the top.

[0040] The material cylinder 100 has a top cover 103 and a bottom wall 102. The stirring shaft 110 is rotatably mounted on the top cover 103. The drive source 104 is fixed relative to the top cover 103. The top cover 103 is provided with a sealed bearing seat 105. The stirring shaft 110 is mounted on the bearing seat 105. The power output end of the power source and the stirring shaft 110 can be connected by a transmission mechanism 106, which can be, for example, a gear assembly, a belt drive assembly, or a coupling assembly. The disc 131 of the stirring head assembly 130 is close to the bottom wall 102, and a gap is formed between the disc and the bottom wall 102. The gap forms a shearing discharge zone to reduce the amount of viscous powder material residue. The bottom wall 102 is provided with a discharge port 140 for discharging the uniformly mixed material out of the material cylinder 100.

[0041] In some embodiments, a pressure sensor is provided inside the barrel 100, and a pressure display device electrically connected to the pressure sensor is provided outside the barrel 100. During the stirring process, the pressure sensor can detect the pressure of the enclosed space of the barrel 100 in real time.

[0042] Figure 2 This is a schematic diagram of the structure of the stirring shaft of a material stirring device according to an embodiment of this application.

[0043] See Figure 1 and Figure 2 In some embodiments, the negative pressure generating mechanism 120 is mounted on the stirring spindle 110, forming a spatially separated layout from the stirring head assembly 130. The negative pressure generating mechanism 120 can be keyed or welded to the stirring spindle 110, and is mounted at a set distance from the upper side of the stirring head assembly 130. Specifically, the negative pressure generating mechanism 120 can be a negative pressure fan, which includes a plurality of blades 121 fixed to the stirring spindle 110 and arranged circumferentially around the stirring spindle 110. The plurality of blades 121 have a set tilt angle, which can be 20°-60°, but is not limited thereto. Specifically, the negative pressure fan includes multiple blades 121 (e.g., 2-8 blades). The multiple blades 121 can be fixed to the hub by screws. The hub is fitted and fixed to the stirring main shaft 110. When the stirring main shaft 110 rotates, the multiple blades 121 rotate synchronously. Since the blades 121 have a set tilt angle, the axial suction force generated when the multiple blades 121 rotate at high speed can form a negative pressure zone B above the negative pressure fan.

[0044] In this embodiment, the stirring head assembly 130 generates a centrifugal positive pressure vortex, which propels the material outward from the circumference of the stirring head assembly 130, thereby rapidly dispersing the material. In related technologies, a positive pressure vortex stirring zone is formed at the stirring head assembly 130, which prevents the material on the outside of the stirring head assembly 130 from mixing with the material on the inside. In this application, a negative pressure generating mechanism 120 is provided above the stirring head assembly 130. The negative pressure mechanism forms a low-pressure zone by rotating and sucking in the impeller 121, generating the Bernoulli effect. As a result, the pressure difference between the positive pressure vortex zone A and the negative pressure zone B forms a directional material flow, forcing the material in the positive pressure vortex zone A to migrate to the negative pressure zone B, breaking the closed boundary of the vortex in related technologies.

[0045] In this application, the negative pressure generating mechanism 120 transports the material in its vicinity to the positive pressure center area of ​​the mixing head assembly 130 through the generated pressure difference. At the same time, the material around the mixing main shaft 110 flows to the negative pressure area B through the pressure difference, forming a closed material circulation path. This increases the circulation speed of the material in the barrel 100, allowing the material to be mixed more quickly and evenly in the barrel 100.

[0046] In some embodiments, the stirring head assembly 130 includes a disc 131 fixed to the end of the stirring spindle 110, with a plurality of stirring teeth 132 extending from the disc 131 away from its surface; the disc 131 is coaxially arranged with the stirring spindle 110 and parallel to the rotation plane of the negative pressure generating mechanism 120. Specifically, the disc 131 can be connected to the spindle by bolts, and the plurality of stirring teeth 132 (e.g., 6 teeth) are arranged in concentric circles, with the ends of the cylinders away from the disc 131 being tapered.

[0047] In some embodiments, the axial direction L of the material cylinder 100 is parallel to the axial direction of the stirring spindle 110 and has a set distance between them. The negative pressure generating mechanism 120 is disposed near the middle of the stirring spindle 110, and the rotation plane of the negative pressure generating mechanism 120 is perpendicular to the axial direction of the stirring spindle 110. The axis of the material cylinder 100 is parallel and offset from the axis of the stirring spindle 110. The negative pressure generating mechanism 120 is installed near the midpoint of the total length of the spindle, and the tip of the blade 121 of the negative pressure generating mechanism 120 has a set distance between it and the inner wall of the material cylinder 100. In this embodiment, the eccentric structure causes the material to form an asymmetric flow field within the material cylinder 100, generating a clockwise spiral upward flow. Compared with the coaxial structure, this increases the amount of material processed under the same power and reduces the energy consumption of the drive source 104.

[0048] In some embodiments, a material viscous zone C is formed inside the barrel, located near the side wall of the barrel 100. A pressure difference is formed between the positive pressure vortex zone A and the negative pressure zone B to drive the material to circulate between the positive pressure vortex zone A, the material viscous zone C, and the negative pressure zone B (see [link]). Figure 1 (The direction of the dashed arrow inside the feed cylinder is indicated by the arrow).

[0049] During the mixing process, when the mixing head assembly 130 rotates, it throws the material outward (or toward the cylinder wall 101). The material near the cylinder wall 101 will accumulate in a viscous manner, that is, a material viscous zone C is generated. In this application, since a stepped pressure field is formed from the positive pressure vortex zone A to the negative pressure zone B to the viscous zone C, the material is radially thrown from the positive pressure zone and then axially drawn up by the negative pressure zone B, forming a spiral upward flow. That is to say, the material in the positive pressure zone moves radially through centrifugal force, and the material in the negative pressure zone B moves axially through pressure difference. The combination of the two forms a three-dimensional spiral flow channel, which enables the material to achieve global circulation in the cylinder 100 rather than local vortex. The material in the viscous zone C is drawn into the high-speed flow zone by negative pressure, avoiding accumulation caused by excessively low flow velocity.

[0050] In some embodiments, the material cylinder 100 is rotatably configured relative to the top cover 103, and the material cylinder 100 and the top cover 103 are connected by a sealing element to form a dynamic seal. When the material cylinder 100 and the stirring shaft 110 rotate simultaneously, the rotation diameter of the stirring head assembly is larger than the radius of the material cylinder. This can increase the stirring coverage area of ​​the stirring head assembly 130 within the material cylinder 100, reduce or avoid material caking or accumulation in the viscous zone C, and further improve the uniformity of material stirring.

[0051] Therefore, the solution of this application transforms the static eddy current in the related technology into a dynamic circulating flow by using a spatially separated pressure field and axial gradient layout, thereby forming a continuous material exchange in the radial and longitudinal directions within the material cylinder 100. This significantly improves the dispersion effect of the material mixing device on the material inside the material cylinder 100, reduces the caking or retention of material in the viscous zone C, and further enhances the dispersion effect of the material.

[0052] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A material mixing device, characterized in that, include: A mixing drum is used to hold the material being mixed. A stirring spindle is installed in the material cylinder, and the end of the stirring spindle extends to the bottom of the material cylinder, and the end is provided with a stirring head assembly; A negative pressure generating mechanism is installed on the stirring spindle and located above the stirring head assembly; The internal space of the material cylinder includes a positive pressure vortex zone formed by the centrifugal action of the stirring head assembly and a negative pressure zone formed by the negative pressure generating mechanism. The pressure difference between the positive pressure vortex zone and the negative pressure zone is used to drive the material to circulate in the material cylinder.

2. The material mixing device according to claim 1, characterized in that: The negative pressure generating mechanism is located near the center of the stirring spindle, and the rotation plane of the negative pressure generating mechanism is perpendicular to the axial direction of the stirring spindle.

3. The material mixing device according to claim 1, characterized in that: The internal space of the material cylinder forms a material viscous zone, and the positive pressure vortex zone and the negative pressure zone form a pressure difference to drive the material to circulate between the positive pressure vortex zone, the material viscous zone and the negative pressure zone.

4. The material mixing device according to claim 1, characterized in that: The axial direction of the material cylinder is parallel to the axial direction of the stirring main shaft and has a set distance; the rotation diameter of the stirring head assembly is greater than the radius of the material cylinder.

5. The material mixing device according to claim 1, characterized in that: The negative pressure generating mechanism includes a plurality of blades fixed to the stirring spindle and arranged circumferentially around the stirring spindle, the plurality of blades having an inclination angle of a set angle value.

6. The material mixing device according to claim 1, characterized in that: The stirring head assembly includes a disc fixed to the end of the stirring spindle. The disc is coaxially arranged with the stirring spindle and parallel to the rotation plane of the negative pressure generating mechanism. The disc extends a plurality of stirring teeth in a direction away from the surface of the disc.

7. The material mixing device according to claim 6, characterized in that: The plurality of stirring teeth are spaced apart along the rotation direction of the disc.

8. The material mixing device according to claim 6, characterized in that: The material cylinder has a bottom wall, the disc of the stirring head assembly is close to the bottom wall and a gap is formed between them, and the bottom wall has a discharge port.

9. The material mixing device according to claim 8, characterized in that: The material cylinder is provided with a top cover, the stirring main shaft is rotatably mounted on the top cover, a drive source is fixed relative to the top cover, and the power output end of the drive source is connected to the stirring main shaft for transmission.

10. The material mixing device according to claim 9, characterized in that: A sealing element is provided between the material cylinder and the top cover.

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