Single-shaft double-layer paddle mixer

Abstract

The single-shaft double-layer paddle mixer provided by the application relates to the technical field of mixers and comprises a shell, a feeding port fixed to the upper end of the shell, a discharging port fixed to the lower end of the shell, a base fixed to the bottom of the shell, a main shaft arranged in the axial direction of the shell, a driving device connected to one end of the main shaft, a plurality of paddle shafts fixed to the main shaft in an axial direction at intervals, double-layer staggered paddles fixed to the paddle shafts in an axial direction, the paddles being circular-arc-shaped and forming an included angle with the main shaft, a lining plate fixed to the inner wall of the shell, and the surface materials of the lining plate and the paddles being buffer materials. The double-layer staggered paddle design, the application of buffer materials and the optimization of the sealing structure realize efficient, low-wear, stable and reliable material mixing.

Description

Technical Field

[0001] This application relates to the field of mixer technology, and in particular to a single-shaft double-layer paddle mixer. Background Technology

[0002] Mixers, based on different structural designs and material movement characteristics, use mechanical force, fluid action, or special field effects to achieve a uniform mixing state of various materials. They are widely used in food and pharmaceuticals, agriculture and animal husbandry, new energy and materials, chemicals, construction and environmental protection, and other fields. Oil coating technology refers to the physical method of uniformly spraying molten oil onto the surface of a core material to form a coating structure with specific functions. This technology is widely used in food, feed, pharmaceuticals, and chemicals. However, oil coating materials are not heat-resistant, brittle, and prone to caking. Anti-caking agents, such as silica and calcium stearate, are usually added to prevent material agglomeration. This process utilizes paddle mixers.

[0003] Traditional mixers typically use metal blades and liners, which physically impact the materials during mixing, easily damaging the coating film and causing unstable product performance. Furthermore, the single-layer blade structure of traditional mixers has limited mixing effect on materials, especially for materials with large density differences or uneven particle sizes, where the mixing uniformity often fails to meet requirements.

[0004] As can be seen from the above, traditional single-layer paddle mixers have disadvantages such as low mixing efficiency and high breakage rate of oil-coated materials. Utility Model Content

[0005] The purpose of this application is to provide a single-shaft double-layer paddle mixer that achieves efficient, low-wear, stable and reliable material mixing through a double-layer staggered paddle design, the application of buffer materials and optimization of the sealing structure.

[0006] The single-shaft double-layer paddle mixer provided in this application adopts the following technical solution: it includes an outer shell, with a feed port fixed at the upper end and a discharge port fixed at the lower end, and a base fixed at the bottom. A main shaft is arranged along the axial direction of the outer shell, and a drive device is connected to one end of the main shaft. Several paddle shafts are axially spaced and fixed on the main shaft. Double-layer staggered paddles are axially fixed on the paddle shafts. The paddles are arc-shaped and form an angle with the main shaft. A liner is fixed to the inner wall of the outer shell. The liner and the surface of the paddles are made of cushioning material.

[0007] Preferably, the liner and blade substrate are made of metal, and the surface material is foamed nylon.

[0008] Preferably, the angle between the blade and the main shaft is 45°.

[0009] Preferably, a support structure is provided between the liner and the outer shell, and the support structure is fixedly connected to the liner.

[0010] Preferably, the spindle is connected to the end of the housing via a bearing and is equipped with a packing seal.

[0011] Preferably, a pressure balance pipe is fixed to the outer wall of one end of the outer shell, with one end of the pressure balance pipe connected to the outside atmosphere and the other end connected to the inside of the liner.

[0012] In summary, this application includes at least one of the following beneficial technical effects:

[0013] This single-shaft, double-layer paddle mixer comprises a casing, inlet, outlet, base, main shaft, reducer, motor, paddle shaft, and paddles. Double-layered, staggered paddles are axially fixed to the paddle shaft. The paddles are arc-shaped and form an angle with the main shaft. A liner is fixed to the inner wall of the casing. The liner and paddle surfaces are made of cushioning material. The double-layered, staggered paddle design increases the material agitation range. Combined with the tilt angle and driven by the appropriate speed of the motor and reducer, it accelerates the axial and radial flow of materials, reducing mixing dead zones. The foamed nylon surface provides both cushioning and self-lubrication, while the metal substrate provides structural strength, significantly extending the service life of the paddles and liners and reducing the coating film breakage rate. Packing seals prevent dust leakage, and a pressure balancing pipe balances the internal air pressure of the liner, preventing material leakage due to pressure fluctuations. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the present application;

[0015] Figure 2 This is a schematic diagram of the internal structure of this application;

[0016] Figure 3 This is a schematic diagram of the main axis portion of this application;

[0017] Figure 4 This is a schematic diagram of the blade shaft cross-sectional arrangement in this application.

[0018] In the picture:

[0019] 1-Outer shell, 2-Inlet, 3-Outlet, 4-Base, 5-Main shaft, 6-Coupling, 7-Reducer, 8-Motor, 9-Paddle shaft, 10-Paddle blade, 11-Liner, 12-Support structure, 13-Air pressure balance pipe, 14-Bearing, 15-Sealing device. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0021] like Figure 1 and Figure 2As shown, a single-shaft double-layer paddle mixer includes a cylindrical outer shell 1. An inlet 2 is fixed to the upper end of the outer shell 1, and an outlet 3 is fixed to the lower end. The bottom is fixed to the ground via a base 4. A main shaft 5 is arranged along the axial direction of the outer shell 1. One end of the main shaft 5 is connected to a drive device, which includes a coupling 6, a reducer 7, and a motor 8. Four paddle shafts 9 are axially spaced and fixed to the main shaft 5. The paddle shafts 9 are relatively fixed to the main shaft 5 and rotate with it. The paddle shafts 9 are fixed to the main shaft 5 by locking screws and clips. Double-layer staggered paddles 10 are axially fixed to the paddle shafts 9. The paddles 10 are arc-shaped and form a 45° angle with the main shaft 5. The angle can be adjusted within the range of 30° to 60° according to mixing requirements. The double-layered paddles 10 are staggered in the axial direction, with the two layers of paddles 10 on each paddle shaft 9 staggered by 90°. Each paddle shaft 9 is evenly distributed on the cross-section of the main shaft at an angle of 90°. Figure 4 The inner wall of the outer casing 1 is connected to a liner 11, which is bolted to the outer casing 1. The mixer is powered by a motor 8, whose speed is reduced to 30-50 r / min via a reducer 7, and then drives the main shaft 5 to rotate via a coupling 6. The mixer blades 10 consist of an upper blade, a lower blade, and a blade shaft 9. The liner 11 and blades 10 are made of stainless steel and covered with foamed nylon with a thickness of 5 mm. When the blades 10 rotate, the upper blades push the material upwards and outwards, while the lower blades push the material downwards and inwards, creating a complex spatial motion trajectory for the material within the mixer. This motion not only ensures thorough mixing of the material horizontally but also achieves uniform distribution vertically, thereby improving mixing efficiency. The foamed nylon liner 11 and the blade 10 have cushioning and self-lubricating properties, reducing the coating breakage rate by more than 70%. The 45° angled blades enhance material mixing efficiency, achieving the same mixing effect while shortening the mixing time by approximately 50%. The substrate of the liner 11 and blade 10 can also be other metal materials (such as carbon steel, aluminum alloy, etc.), and the surface coating material can also be other cushioning materials (such as rubber, silicone, etc.).

[0022] like Figure 2As shown, this application also provides a support structure between the outer shell 1 and the liner 11. The support structure consists of four sets of L-shaped metal support plates spaced 300mm apart. One end of each support plate is welded to the inner wall of the outer shell 1, and the other end is fixed to the liner 11 with bolts. The support structure 12 can distribute the force on the liner 11 and enhance stability. The main shaft 5 is connected to the end of the outer shell 1 through a double-row tapered roller bearing. A sealing device 15 with graphite packing is provided on the outside of the bearing 14, which can effectively prevent dust from entering the bearing and avoid equipment failure and downtime due to dust. In order to prevent the packing blockage and dust leakage caused by the air pressure change in the internal cavity of the mixer during the mixing process, an air pressure balance pipe 13 with an inner diameter of 200mm is welded to the outer wall of one end of the outer shell 1. One end of the pipe is connected to the outside atmosphere, and the other end passes through the outer shell 1 and connects to the internal cavity of the liner 11. This allows the internal cavity of the mixer to be balanced with the external air pressure.

[0023] When the mixer is working, the material enters the mixer once through the feed inlet 2. The mixer chamber consists of an outer shell 1 and a liner 11 with a supporting structure 12. The main body of the mixer is placed on the base 4. The mixed material enters the mixer storage chamber through the discharge outlet 3. The motor 8 reduces the speed to 30-50 r / min through the reducer 7 and drives the main shaft 5 through the coupling 6. A bearing 14 and a packing seal device 15 are installed between the mixer outer shell 1 and the main shaft 5 to prevent material leakage during the mixing process. When the double-layer blades 10 of the mixer rotate, the upper blades push the material upward and outward, while the lower blades push the material downward and inward, so that the material is mixed evenly in the mixer. The mixer is also equipped with an inspection door, which is fully sealed to the mixer body by a fastening handwheel and a sealing gasket. Because positive pressure is instantly generated in the mixer's buffer chamber when the material is discharged after mixing, an air pressure balance pipe 13 is designed to balance the pressure in the mixer's buffer chamber and inside the mixer, preventing dust from flying due to unbalanced air pressure during discharge.

[0024] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single-shaft double-layer paddle mixer, comprising a cylindrical outer shell (1), an inlet (2) fixed at the upper end of the outer shell (1), an outlet (3) fixed at the lower end, and the bottom fixed to the ground via a base (4); a main shaft (5) is arranged along the axial direction of the outer shell (1), and one end of the main shaft (5) is connected to a drive device, characterized in that: Several blade shafts (9) are axially fixed to the main shaft (5) at intervals. Double-layered staggered blades (10) are axially fixed to the blade shafts (9). The blades (10) are arc-shaped and form an angle with the main shaft (5). A liner (11) is fixed to the inner wall of the outer shell (1). The surface material of the liner (11) and the blades (10) is a cushioning material.

2. The single-shaft double-layer paddle mixer according to claim 1, characterized in that: The substrates of the liner (11) and the blade (10) are made of metal, and the surface material is foamed nylon.

3. A single-shaft double-layer paddle mixer according to claim 1, characterized in that: The angle between the blade (10) and the main shaft (5) is 45°.

4. A single-shaft double-layer paddle mixer according to any one of claims 1 to 3, characterized in that: A support structure (12) is provided between the liner (11) and the outer shell (1), and the support structure (12) is fixedly connected to the liner (11).

5. A single-shaft double-layer paddle mixer according to claim 4, characterized in that: The spindle (5) is connected to the end of the housing (1) by a bearing (14) and is provided with a sealing device (15).

6. A single-shaft double-layer paddle mixer according to claim 5, characterized in that: A pressure balance tube (13) is fixed to one end of the outer wall of the outer shell (1). One end of the pressure balance tube (13) is connected to the outside atmosphere, and the other end is connected to the internal cavity of the liner (11).

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