Controllable double-screw continuous flow mixer

Abstract

The utility model discloses a controllable double-screw continuous flow mixing machine which comprises a rack, a mixing chamber is fixedly arranged on the rack, one end of the mixing chamber is fixedly connected with a feeding port, a transmission system is fixedly arranged beside the other end of the mixing chamber, a reverse conjugate meshing screw is arranged in the mixing chamber, and the reverse conjugate meshing screw is connected with the feeding port. The reverse conjugate meshing spiral is arranged in the mixing chamber, bearing seats are arranged at two ends of the reverse conjugate meshing spiral, the bearing seats are fixedly connected with the rack, the transmission system is in transmission connection with one end of the conjugate meshing spiral, and an online dynamic measurement system is fixedly arranged in the rack and is positioned below an outlet of the mixing chamber. According to the utility model, the reverse conjugate meshing screw is arranged, and the dispersion conjugate incongruous gear pair is arranged on the reverse conjugate meshing screw, so that the layered distribution state of multi-component powder at the feeding hole can be quickly destroyed through the rotation of the blades of the dispersion conjugate incongruous gear pair, and the efficient and quick pre-stirring, dispersion and mixing effects of the multi-component raw material powder are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to material mixing technical field, concretely is controllable double screw continuous flow mixing machine. BACKGROUND

[0002] In the production process of solid oral preparations, the uniformity of mixing of multi-component raw material powder and the repeatability of mixing process are key factors to ensure the consistency of quality and biological efficacy of the final product. However, achieving uniformity of powder mixing and process repeatability, especially for ultra-low component content and high cohesive viscosity raw material powder, has always been a major challenge in the industry. When processing multi-component powder, the traditional double screw mixer has poor mixing performance, often failing to achieve ideal mixing uniformity, especially when processing ultra-low component content and high cohesive viscosity raw material powder, the mixing uniformity and process repeatability are difficult to control, and it is difficult to meet the technical requirement of relative standard deviation RSD≤5% of ultra-low component and high cohesive viscosity raw material powder mixing uniformity. This is mainly because the traditional double screw mixer lacks effective premixing and intensive mixing mechanism, resulting in easy formation of stratified distribution of multi-component powder during mixing, and difficult to achieve efficient and uniform mixing. In addition, the existing mixing equipment usually lacks online monitoring and control function, and cannot detect and adjust the powder mixing uniformity in the mixing process in real time, resulting in poor repeatability of the mixing process and affecting the quality and consistency of the final product. SUMMARY

[0003] The utility model aims at providing a controllable double screw continuous flow mixing machine to solve the technical problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A controllable double screw continuous flow mixing machine, comprising a rack, a mixing chamber fixedly arranged on the rack, an inlet fixedly connected to one end of the mixing chamber, a transmission system fixedly arranged beside the other end of the mixing chamber, a reverse conjugate meshing screw arranged in the mixing chamber, bearing seats installed at both ends of the reverse conjugate meshing screw, the bearing seats fixedly connected with the rack, the transmission system in transmission connection with one end of the conjugate meshing screw, an online dynamic measurement system fixedly arranged in the rack, the online dynamic measurement system located below the outlet of the mixing chamber.

[0006] Further, the reverse conjugate engagement screw includes a first mixing screw and a second mixing screw, the first mixing screw includes a short conveying screw, a long conveying screw and a dispersion counter gear, the long conveying screw is a lengthened version of the short conveying screw, the dispersion counter gear is coaxially fixedly connected with the short conveying screw and the long conveying screw at two ends respectively, the second mixing screw is the same in structure and size as the first mixing screw but is opposite in rotation direction and is reversely conjugate engagement with the first mixing screw, and the first mixing screw is close to the feeding port.

[0007] Further, the dispersion counter gear is fixedly provided with four blades in a uniform distribution in the radial direction, and the included angle between the blade and the axis of the dispersion counter gear is 15-25 degrees.

[0008] Further, the short conveying screw and the long conveying screw are provided with a plurality of rectangular grooves along the spiral blades, and the number of the rectangular grooves in one circle of the spiral blade is four and is uniformly distributed at an angle of 90 degrees.

[0009] Further, the online dynamic measurement system adopts a multi-point optical fiber probe near-infrared spectrum detector.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] 1. The reverse conjugate engagement screw is provided with a dispersion conjugate counter gear pair, the blades of the dispersion conjugate counter gear pair can quickly destroy the layered distribution state of the multi-component powder at the feeding port, realize the high-efficiency and rapid pre-stirring dispersion mixing effect of the multi-component raw material powder, the rectangular grooves uniformly distributed at an angle of 90 degrees are arranged on the short conveying screw and the long conveying screw, the rectangular grooves can produce the rotating and overturning dispersion fluidization effect on the raw material powder in the mixing chamber cavity during the reverse conjugate engagement rotation, the mixing and dispersion performance is further improved, the combination of the two is beneficial to produce the high-efficiency mixing function, greatly improves the mixing performance, and the relative standard deviation of the mixing uniformity meets the technical requirement of RSD≤5%.

[0012] 2. The multi-point optical fiber probe near-infrared spectrum detector is arranged, realizes the online dynamic measurement of the end-point output powder mixing uniformity RSD, and ensures the repeatability of the mixing process and the stability of the mixing uniformity. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the utility model;

[0014] Figure 2 It is a schematic view of the reverse conjugate engagement screw;

[0015] Figure 3 It is a partial enlarged view of the reverse conjugate engagement screw.

[0016] Figure 4 dispersion counter gear schematic view;

[0017] In the figure: 1 - inlet, 2 - conjugate meshing screw, 201 - first mixing screw, 202 - second mixing screw, 203 - short conveying screw, 204 - long conveying screw, 205 - dispersion counter gear, 206 - blade, 207 - rectangular groove, 3 - mixing chamber, 4 - transmission system, 5 - online dynamic measurement system, 6 - bearing seat, 7 - rack. DETAILED DESCRIPTION

[0018] The utility model will be described in detail below in combination with the drawings and specific embodiments.

[0019] Please refer to Figures 1-4 , the utility model provides an embodiment:

[0020] A controllable double screw continuous flow mixer, including rack 7, rack 7 is fixedly provided with mixing chamber 3, and one end of mixing chamber 3 is fixedly connected with inlet 1, and the other end is fixedly provided with transmission system 4, and the inside of mixing chamber 3 is provided with reverse conjugate meshing screw 2, and bearing seat 6 is installed at the two ends of reverse conjugate meshing screw 2, and bearing seat 6 is fixedly connected with rack 7, and transmission system 4 is in transmission connection with one end of conjugate meshing screw 2, and rack 7 is fixedly provided with online dynamic measurement system 5, and online dynamic measurement system 5 is located below the outlet of mixing chamber 3.

[0021] Wherein, reverse conjugate meshing screw 2 includes first mixing screw 201 and second mixing screw 202, first mixing screw 201 includes short conveying screw 203, long conveying screw 204 and dispersion counter gear 205, long conveying screw 204 is the lengthened type of short conveying screw 203, and dispersion counter gear 205 is coaxially fixedly connected with short conveying screw 203 and long conveying screw 204 at two ends respectively, and second mixing screw 202 is same in structure size with first mixing screw 201 but opposite in rotation and reversely conjugate meshing with first mixing screw 201, and first mixing screw 201 is close to inlet 1.

[0022] Wherein, dispersion counter gear 205 is fixedly and uniformly provided with four blades 206 in radial direction, and the included angle between blade 206 and the axis of dispersion counter gear 205 is 15-25 degrees.The dispersion counter gear 205 on first mixing screw 201 and second mixing screw 202 forms dispersion conjugate counter gear pair, and through the rotation of blade 206 of dispersion conjugate counter gear pair, the layered distribution state of multi-component powder at inlet 1 can be quickly destroyed, and the high-efficiency and rapid pre-mixing dispersion mixing effect of multi-component raw material powder can be realized.

[0023] The short conveying screw rod 203 and the long conveying screw rod 204 are provided with a plurality of rectangular grooves 207 along the spiral blade, and the number of the rectangular grooves 207 in one circle of the spiral blade is four and is uniformly distributed at 90 degrees. The rectangular grooves 207 can produce a rotating lifting and dispersion fluidization effect on the raw material powder in the mixing chamber 3 type cavity during the reverse conjugate meshing rotation of the first mixing screw rod 201 and the second mixing screw rod 202, further improve the mixing dispersion performance, and make the relative standard deviation of the mixing uniformity meet the technical requirement of RSD≤5%.

[0024] The dispersion conjugate different direction gear pair and the rectangular grooves 207 uniformly distributed at 90 degrees cut on the screw rod are beneficial to produce high-efficiency mixing function, greatly improve the mixing performance, and solve the technical bottleneck problem that the mixing performance of the existing traditional double-screw multi-component powder mixer is poor and it is difficult to meet the technical requirement that the relative standard deviation RSD of the mixing uniformity of the ultra-low component and high cohesive viscosity raw material powder is ≤5%.

[0025] The online dynamic measurement system 5 adopts a multi-point optical fiber probe near-infrared spectrum detector with a model of MATRIX-FII P6D, and the production manufacturer is bruker. The multi-point optical fiber probe near-infrared spectrum detector calculates the online real-time component mass fraction content of the space multi-points of the outlet mixed powder through an online dynamic measurement module, calculates the relative average standard deviation RSD of the mixing uniformity according to the online real-time component mass fraction content of the space multi-points, so as to realize the online measurement of the online real-time component mass fraction content of the space multi-points and the mixing uniformity RSD, and thus ensure the repeatability of the mixing process and the stability of the mixing uniformity.

[0026] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A controllable twin-screw continuous flow mixer comprising a frame (7), characterized in that: The rack (7) is fixedly provided with a mixing chamber (3), one end of the mixing chamber (3) is fixedly connected with an inlet (1), the other end is fixedly provided with a transmission system (4) beside, the mixing chamber (3) is provided with a reverse conjugate engagement screw (2), the reverse conjugate engagement screw (2) is provided with a bearing seat (6) at both ends, the bearing seat (6) is fixedly connected with the rack (7), the transmission system (4) is in transmission connection with one end of the conjugate engagement screw (2), the rack (7) is fixedly provided with an online dynamic measurement system (5) inside, and the online dynamic measurement system (5) is located below the outlet of the mixing chamber (3).

2. A controllable twin-screw continuous flow mixer according to claim 1, characterized in that: The reverse conjugate engagement screw (2) comprises a first mixing screw (201) and a second mixing screw (202), the first mixing screw (201) comprises a short conveying screw (203), a long conveying screw (204) and a dispersion gear (205), the long conveying screw (204) is a lengthened type of the short conveying screw (203), the dispersion gear (205) is fixedly connected with the short conveying screw (203) and the long conveying screw (204) coaxially at both ends, the second mixing screw (202) is the same in structure and size as the first mixing screw (201), but the rotation direction is opposite and the first mixing screw (201) is reversely conjugate engagement, and the first mixing screw (201) is close to the inlet (1).

3. A controllable twin-screw continuous flow mixer according to claim 2, characterized in that: The dispersion gear (205) is fixedly provided with four blades (206) radially and uniformly, and the included angle between the blade (206) and the axis of the dispersion gear (205) is 15-25 degrees.

4. A controllable twin-screw continuous flow mixer according to claim 2, characterized in that: The short conveying screw (203) and the long conveying screw (204) are provided with a plurality of rectangular grooves (207) along the spiral blades, and the number of the rectangular grooves (207) in one circle of the spiral blade is four and is uniformly distributed at 90 degrees.

5. A controllable twin-screw continuous flow mixer according to claim 1, characterized in that: The online dynamic measurement system (5) adopts a multi-point optical fiber probe near-infrared spectrum detector with a MATRIX-FII P6D model.

Images