Automatic blending device for preparing paper-making reconstituted tobacco powder coating liquid

Abstract

The utility model relates to an automatic blending device for preparing paper-making reconstituted tobacco powder coating liquid, and belongs to the technical field of coating liquid preparation. Comprising a coating liquid preparation tank, a powder dispersion tank, a paddle stirrer, an anchor stirrer and a powder liquid feeding tank, according to the utility model, on-line blending operation or off-line blending operation can be selectively executed according to the coating requirements of products in a coating process, so that the adaptation degree of the blending operation of the coating liquid to different coating requirements is effectively improved; the powder raw material is high in dispersion efficiency and good in dispersion uniformity in the tobacco concentrated solution or water, and the coating liquid is good in mixing effect, high in mixing efficiency, high in homogenization degree, simple to operate, convenient to use and high in automation degree by adopting an on-line mixing or off-line mixing mode.

Description

Technical Field

[0001] The utility model relates to an automatic mixing device for preparing a powder coating liquid for papermaking reconstituted tobacco, belonging to the technical field of coating liquid preparation. Background Art

[0002] Papermaking reconstituted tobacco uses waste materials such as tobacco stems, tobacco dust, and shredded tobacco pieces in the cigarette processing process as raw materials. Through solid-liquid separation and extraction, a tobacco extract is obtained. After multi-layer purification and concentration, it is flavored and formulated into a coating liquid through the batching section, and is accurately, evenly, and stably coated onto the base of the reconstituted tobacco according to the designed coating rate. After drying and slicing, it is used for cigarette production; due to product design requirements, various powder raw materials such as tobacco powder or plant powder are added during the preparation of the coating liquid to meet the sensory requirements of the product. The added tobacco powder or plant powder is usually a light powder with a very high mesh number and a high sugar content after ultra-fine grinding, and it is very difficult to dissolve in water and mostly floats on the water surface; during production, according to the design requirements of the coating rate and hot water-soluble substances, strict control is required for the amount of water mixed, and if necessary, tobacco concentrate needs to be directly used for mixing, which further increases the difficulty of mixing the powder with the tobacco concentrate.

[0003] In the prior art, the mixing of the coating liquid is usually carried out in an off-line mixing manner. For example, a convenient-to-use coating liquid mixing and preparation device disclosed in a Chinese patent with the publication number CN210473858U stirs and mixes the liquid through a mixing mechanism with arc-shaped stirring blades installed in the mixing box; and a reconstituted tobacco coating liquid mixing and preparation device disclosed in a Chinese patent with the publication number CN203355664U reciprocates through the cooperation of a perforated disc with a guide groove installed in the mixing tank and a guide rail, and realizes the mixing of powder and liquid by generating longitudinal high-intensity turbulence. However, for the mixing of the above-mentioned light powder and tobacco concentrate, using the mixing methods of the above-mentioned existing mixing devices, there is a problem that most of the powder exists in the coating liquid in the form of large agglomerated particles and cannot be effectively and evenly dispersed, resulting in a low degree of homogenization and high viscosity of the mixed coating liquid. During coating, large particles are easily adhered to the surface of the finished product, or adhered to the coating roller surface and the drying support net, causing quality problems such as uneven coating, white flakes, and paper breakage. The over-viscous coating liquid will also cause the coating machine to shake, the drying support net to deviate or even deform, increasing the manual maintenance and equipment operation costs.

[0004] Therefore, it is necessary to provide an automatic mixing device for preparing a powder coating liquid for papermaking reconstituted tobacco, so as to effectively ensure the homogeneity of the coating liquid supply per unit time and ensure the quality stability of the reconstituted tobacco coating process. Summary of the Utility Model

[0005] In order to overcome the problems existing in the background art, the present utility model provides an automatic mixing device for preparing a powder coating liquid for reconstituted tobacco by the papermaking method. By providing a coating liquid preparation tank, a powder dispersion tank, and a powder feeding tank, it is possible to select to perform on-line mixing operation or off-line mixing operation according to the coating requirements of the product in the coating process, effectively improving the adaptability of the coating liquid mixing operation to different coating requirements. By providing a paddle stirrer and an anchor stirrer, the powder raw materials have high dispersion efficiency and good dispersion uniformity in the tobacco concentrate or water. By adopting the on-line mixing or off-line mixing method, the mixing effect of the coating liquid is good, the mixing efficiency is high, the homogenization degree of the coating liquid is high, the operation is simple, the use is convenient, and the automation degree is high.

[0006] To solve the above problems, the present utility model is realized through the following technical solutions:

[0007] An automatic mixing device for preparing a powder coating liquid for reconstituted tobacco by the papermaking method, comprising a coating liquid preparation tank, a powder dispersion tank, a first transfer pump, a second transfer pump, a feed pipe, a feed hopper, a paddle stirrer, and an anchor stirrer. The coating liquid preparation tank is used for storing tobacco concentrate and finished coating liquid. The discharge port of the coating liquid preparation tank is connected to a first transfer pump through a material conveying pipe. The first transfer pump is connected to the upper feed port of the powder dispersion tank through a material conveying pipe. A first valve and a second valve are respectively installed on the material conveying pipes at both ends of the inlet and outlet of the first transfer pump. The upper end of the powder dispersion tank is connected to a feed hopper for adding powder raw materials through a feed pipe. The discharge port of the powder dispersion tank is connected to a second transfer pump through a material conveying pipe. The second transfer pump is connected to the upper feed port of the coating liquid preparation tank through a material conveying pipe. A third valve is installed on the material conveying pipe between the second transfer pump and the powder dispersion tank. The discharge port of the second transfer pump is also connected to the upper feed port of the powder dispersion tank through a feed branch pipe. A fourth valve is installed at one end of the feed branch pipe close to the upper feed port of the powder dispersion tank. At least one paddle stirrer is arranged in the coating liquid preparation tank, and an anchor stirrer and at least one paddle stirrer are arranged in the powder dispersion tank.

[0008] Preferably, the feed hopper is arranged on the upper floor slab, the feed pipe penetrates through the floor slab, and an electronic belt scale for real-time metering and weighing of the powder raw materials is also arranged above the feed hopper.

[0009] Preferably, the anchor stirrer includes a first driving motor, a first stirring shaft, and anchor-shaped scrapers. The first driving motor is drivingly connected to the first stirring shaft. Anchor-shaped scrapers are symmetrically installed on both sides of the first stirring shaft. The structure of the anchor-shaped scrapers matches the inner wall structure of the powder dispersion tank.

[0010] Preferably, the paddle stirrer includes a second drive motor, a second stirring shaft, and stirring blades. The second drive motor is drivingly connected to the second stirring shaft, and at least two groups of stirring blades are arranged in an array along the axis direction of the second stirring shaft.

[0011] In one solution, the blades of the stirring blades of the paddle stirrer are in a spiral structure.

[0012] In one solution, an anchor stirrer is installed in the powder dispersion tank, and at least two paddle stirrers are arranged in an array in the cavity between the first stirring shaft and the anchor scraper.

[0013] In one solution, the upper feed port of the powder dispersion tank is also communicated with a water storage tank through a water injection pipe, a fifth valve is installed on the water injection pipe, the feeding branch pipe is also communicated with a powder feeding liquid tank through a feeding pipe, the discharge port of the powder feeding liquid tank is communicated with a third liquid transfer pump through a feeding pipe, a sixth valve and a seventh valve are respectively installed on the feeding pipes at both ends of the inlet and outlet of the powder feeding liquid tank, a three-way valve is communicated on the feeding pipe between the discharge port of the powder dispersion tank and the upper feed port of the coating liquid preparation tank, one of the feed ports of the three-way valve is communicated with the discharge port of the third liquid transfer pump, and at least one paddle stirrer is arranged in the powder feeding liquid tank.

[0014] The beneficial effects of the present utility model are as follows:

[0015] By providing a coating liquid preparation tank, a powder dispersion tank, and a powder feeding liquid tank, the present utility model can select to perform on-line mixing operation or off-line mixing operation according to the coating requirements of products in the coating process, effectively improving the adaptability of the coating liquid mixing operation to different coating requirements. By providing a paddle stirrer and an anchor stirrer, the powder raw materials have high dispersion efficiency and good dispersion uniformity in the tobacco concentrate or water. By adopting the on-line mixing or off-line mixing method, the coating liquid has good mixing effect, high mixing efficiency, high homogenization degree of the coating liquid, simple operation, convenient use, and high automation degree. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the installation of the stirrer in the coating liquid preparation tank of the present utility model;

[0018] Figure 3 is a schematic diagram of the pipeline connection during on-line mixing of the present utility model;

[0019] Figure 4 is a schematic diagram of the mixing process during on-line mixing of the present utility model;

[0020] Figure 5Schematic diagram of pipeline connection during offline mixing of the present utility model;

[0021] Figure 6 Schematic diagram of the mixing process during offline mixing of the present utility model.

[0022] Description of reference numerals: 1 - Coating liquid preparation tank, 2 - Powder dispersion tank, 3 - First liquid transfer pump, 4 - Second liquid transfer pump, 5 - Feed pipe, 6 - Feed hopper, 7 - Paddle stirrer, 8 - Anchor stirrer, 9 - Material conveying pipe, 10 - Material conveying branch pipe, 11 - First valve, 12 - Second valve, 13 - Third valve, 14 - Fourth valve, 15 - Electronic belt scale, 801 - First driving motor, 802 - First stirring shaft, 803 - Anchor scraper, 701 - Second driving motor, 702 - Second stirring shaft, 703 - Stirring paddle, 16 - Water injection pipe, 17 - Water storage tank, 18 - Fifth valve, 19 - Powder feeding liquid tank, 20 - Third liquid transfer pump, 21 - Sixth valve, 22 - Seventh valve, 23 - Three-way valve. Detailed implementation manners

[0023] In order to make the purpose, technical solutions and achieved purposes and effects of the present utility model obvious and easy to understand, the preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings for the understanding of those skilled in the art.

[0024] It should be noted that in the description of the present utility model, without clear regulations and limitations, terms such as "installation", "connection", "connection", "connected" should be understood in a broad sense, that is, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium.

[0025] In the present utility model, as Figures 1-6As shown in the figure, an automatic mixing device for preparing a powder coating liquid for reconstituted tobacco by the papermaking method includes a coating liquid preparation tank 1, a powder dispersion tank 2, a first transfer pump 3, a second transfer pump 4, a feed pipe 5, a feed hopper 6, a paddle stirrer 7, and an anchor stirrer 8. The coating liquid preparation tank 1 is used to store tobacco concentrate and finished coating liquid. The discharge port of the coating liquid preparation tank 1 is connected to a first transfer pump 3 through a feed pipe 9. The first transfer pump 3 is connected to the upper feed port of the powder dispersion tank 2 through a feed pipe 9. A first valve 11 and a second valve 12 are respectively installed on the feed pipes 9 at both ends of the inlet and outlet of the first transfer pump 3. The upper end of the powder dispersion tank 2 is connected to a feed hopper 6 for adding powder raw materials through a feed pipe 5, so as to add powder raw materials through the feed hopper 6 and introduce the powder raw materials into the powder dispersion tank 2 through the feed pipe 5. The discharge port of the powder dispersion tank 2 is connected to a second transfer pump 4 through a feed pipe 9. The second transfer pump 4 is connected to the upper feed port of the coating liquid preparation tank 1 through a feed pipe 9. A third valve 13 is installed on the feed pipe 9 between the second transfer pump 4 and the powder dispersion tank 2. At least one paddle stirrer 7 is arranged in the coating liquid preparation tank 1, and an anchor stirrer 8 and at least one paddle stirrer 7 are arranged in the powder dispersion tank 2. Thus, the materials in the coating liquid preparation tank 1 and the powder dispersion tank 2 are fully stirred and mixed by the paddle stirrer 7, which can effectively improve the dispersion efficiency and dispersion effect of the powder raw materials in the tobacco concentrate or water, and the inner wall of the powder dispersion tank 2 is rotated and scraped by the anchor stirrer 8, which can effectively remove the residual powder clusters that are not fully dispersed on the tank wall.

[0026] As Figures 3-4 , the coating liquid preparation tank 1 and the powder dispersion tank 2 are connected through a feed pipe 9 to form a circulation loop. The tobacco concentrate pre-stored in the coating liquid preparation tank 1 is pumped to the powder dispersion tank 2 by the first transfer pump 3. At the same time, powder raw materials are added to the powder dispersion tank 2 through the feed hopper 6. Under the stirring action of the paddle stirrer 7 and the anchor stirrer 8, the powder raw materials and the tobacco concentrate are initially mixed in the powder dispersion tank 2, and the mixed liquid is pumped back to the coating liquid preparation tank 1 by the second transfer pump 4, so that the powder raw materials and the tobacco concentrate are secondarily mixed in the coating liquid preparation tank 1 and stirred by the paddle stirrer 7. Subsequently, the mixed liquid is pumped to the powder dispersion tank 2 by the first transfer pump 3 again, and so on in a cycle. At the same time, the feed hopper 6 continuously feeds materials until the feeding amount reaches the preset value. Subsequently, under the action of the first transfer pump 3 and the second transfer pump 4, continuous cyclic mixing is carried out until the coating liquid meets the coating process requirements, and then the online mixing operation is completed; specifically, in the online mixing state, the first valve 11 and the second valve 12 can be closed after the coating liquid mixing is completed, and the coating liquid is pumped to the coating liquid preparation tank 1 by the second transfer pump 4 for standby, or all components can be continuously opened to continuously carry out the mixing operation while transporting the finished coating liquid to the coating process for use.

[0027] In this embodiment, the discharge port of the second liquid transfer pump 4 is also communicated with the upper feed port of the powder dispersion tank 2 through a feed branch pipe 10. A fourth valve 14 is installed at one end of the feed branch pipe 10 close to the upper feed port of the powder dispersion tank 2, so as to inject part of the mixed liquid pumped out by the second liquid transfer pump 4 into the powder dispersion tank 2 in real time through the feed branch pipe 10, so that the powder dispersion tank 2 forms a self-circulation loop. At the same time, the impact of the re-injected mixed liquid flow on the mixed liquid in the powder dispersion tank 2 can promote stirring, thereby effectively improving the dispersion efficiency of the powder raw materials and the powder-liquid mixing efficiency.

[0028] In this embodiment, by adopting the online mixing method, the coating liquid preparation tank 1 and the powder dispersion tank 2 are communicated to form a circulation loop. Under the stirring action of the paddle stirrer 7 and the anchor stirrer 8, the mixed liquid of the powder raw materials and the tobacco concentrate can be continuously circulated and mixed. The powder raw materials have high dispersion efficiency, good dispersion uniformity, high mixing efficiency, and high homogenization degree of the coating liquid, which can meet the requirements of the coating process, effectively ensure the homogeneity of the coating liquid supply per unit time, and effectively avoid equipment failures or coating quality problems caused by low homogenization degree and high viscosity of the coating liquid, and can effectively ensure the quality stability of the reconstituted tobacco coating process.

[0029] Optionally, the feed hopper 6 is arranged on the upper floor slab, the feed pipe 5 penetrates through the floor slab, and an electronic belt scale 15 for real-time weighing and metering of the powder raw materials is further arranged above the feed hopper 6, so that the feeding amount of the powder raw materials can be weighed and measured by the electronic belt scale 15, which is convenient for operators to observe the feeding amount and control the feeding speed; at the same time, by arranging the feed hopper 6 and the powder dispersion tank 2 on different floors and connecting the feed hopper 6 and the powder dispersion tank 2 through the feed pipe 5, on the one hand, the added powder raw materials can be accurately guided, reducing the feeding difficulty, and on the other hand, the dust generated during the feeding of the powder raw materials in the coating liquid mixing production line can be effectively reduced.

[0030] In this embodiment, the anchor stirrer 8 includes a first driving motor 801, a first stirring shaft 802, and an anchor-shaped scraper 803. The first driving motor 801 is drivingly connected to the first stirring shaft 802, and anchor-shaped scrapers 803 are symmetrically installed on both sides of the first stirring shaft 802. The structure of the anchor-shaped scraper 803 matches the inner wall structure of the powder dispersion tank 2. The first driving motor 801 drives the anchor-shaped scraper 803 to rotate through the first stirring shaft 802. Thus, through the rotating wall scraping action of the anchor-shaped scraper 803 on the inner wall of the powder dispersion tank 2, the residual powder clusters that are not completely dispersed on the tank wall can be effectively removed, and further, the dispersion efficiency and dispersion effect of the powder raw materials in the tobacco concentrate or water can be further improved; in specific applications, the anchor-shaped scraper 803 can be made of polytetrafluoroethylene plates.

[0031] In this embodiment, the paddle stirrer 7 includes a second drive motor 701, a second stirring shaft 702, and stirring blades 703. The second drive motor 701 is drivingly connected to the second stirring shaft 702. At least two groups of stirring blades 703 are arranged in an array along the axial direction of the second stirring shaft 702. The second drive motor 701 drives the stirring blades 703 to rotate through the second stirring shaft 702 to stir and disperse the mixed liquid in the powder dispersion tank 2, which can effectively improve the dispersion efficiency and dispersion uniformity of the powder raw materials in the tobacco concentrate or water, and can effectively improve the mixing efficiency of the coating liquid and the homogenization degree of the coating liquid.

[0032] In one embodiment, the blades of the stirring blades 703 of the paddle stirrer 7 can also adopt a spiral structure, so as to further improve the stirring effect on the powder raw materials and the tobacco concentrate through the spiral stirring blades 703, and further improve the dispersion efficiency and dispersion uniformity of the paddle stirrer 7 on the materials.

[0033] Such as Figure 2 , in one embodiment, an anchor stirrer 8 is installed in the powder dispersion tank 2. At least two paddle stirrers 7 are arranged in an array in the cavity between the first stirring shaft 802 and the anchor scraper 803, so as to facilitate the removal of the incompletely dispersed powder masses remaining on the inner wall of the powder dispersion tank 2 by the anchor stirrer 8. At the same time, the paddle stirrers 7 arranged in an array stir and disperse the mixed materials in the cavity between the first stirring shaft 802 and the anchor scraper 803, which can effectively improve the dispersion efficiency and dispersion uniformity of the mixed materials in the powder dispersion tank 2.

[0034] Such as Figure 1 、 Figure 5 、 Figure 6, in one embodiment, the upper feed inlet of the powder dispersion tank 2 is also communicated with a water storage tank 17 through a water injection pipe 16. A fifth valve 18 is installed on the water injection pipe 16. The feeding branch pipe 10 is also communicated with a powder feeding liquid tank 19 through a feeding pipe 9. The discharge port of the powder feeding liquid tank 19 is communicated with a third liquid transfer pump 20 through the feeding pipe 9. Sixth valves 21 and seventh valves 22 are respectively installed on the feeding pipes 9 at both ends of the inlet and outlet of the powder feeding liquid tank 19. A three-way valve 23 is communicated on the feeding pipe 9 between the discharge port of the powder dispersion tank 2 and the upper feed inlet of the coating liquid preparation tank 1. One of the feed inlets of the three-way valve 23 is communicated with the discharge port of the third liquid transfer pump 20. At least one paddle stirrer 7 is arranged in the powder feeding liquid tank 19. Thus, water and powder raw materials are respectively injected into the powder dispersion tank 2 through the water injection pipe 16 and the feed hopper 6. The inner wall of the powder dispersion tank 2 is rotated and scraped by the anchor stirrer 8, so that the powder clusters remaining on the tank wall and not fully dispersed can be effectively removed. The mixed materials in the coating liquid preparation tank 1 and the powder feeding liquid tank 19 are fully stirred and mixed by the paddle stirrer 7, so that the dispersion efficiency and dispersion effect of the powder raw materials in the tobacco concentrate or water can be effectively improved.

[0035] As Figure 5 , Figure 6 , a powder feeding liquid tank 19 is arranged between the powder dispersion tank 2 and the coating liquid preparation tank 1. The powder dispersion tank 2, the powder feeding liquid tank 19, and the coating liquid preparation tank 1 are sequentially communicated to form a material flow path. The tobacco concentrate is pre-stored in the coating liquid preparation tank 1. Water and powder raw materials are respectively injected into the powder dispersion tank 2 through the water injection pipe 16 and the feed hopper 6. Under the stirring action of the paddle stirrer 7 and the anchor stirrer 8, the powder raw materials and water are initially mixed and stirred in the powder dispersion tank 2. A part of the mixed liquid is pumped to the powder feeding liquid tank 19 for buffering and secondary stirring by the second liquid transfer pump 4, and a part is pumped to the coating liquid preparation tank 1 to be mixed with the tobacco concentrate. The mixed materials in the powder feeding liquid tank 19 are pumped by the third liquid transfer pump 20 and mixed with the mixed materials to be sent into the coating liquid preparation tank 1 again, so that the powder raw materials, water, and tobacco concentrate are mixed in the coating liquid preparation tank 1 and fully stirred and mixed by the paddle stirrer 7 until the coating liquid meets the coating process requirements, then the operation is stopped and the coating liquid is stored in the coating liquid preparation tank 1 for standby. Thus, the off-line mixing operation is completed; specifically, in the off-line mixing state, after the finished coating liquid is transported and stored in the coating liquid preparation tank 1, the mixing of the next tank of coating liquid can be carried out in the powder dispersion tank 2 and the powder feeding liquid tank 1. Thus, while the first tank of coating liquid is transferred and used, the mixing operation of the second tank of coating liquid can be carried out, which can effectively shorten the mixing waiting time of the coating liquid to ensure the stable supply of the coating liquid in the coating process.

[0036] In this embodiment, an off-line mixing method is adopted. By arranging a powder feeding tank 19 between the powder dispersion tank 2 and the coating liquid preparation tank 1, after the mixed material of the powder raw material and water is initially stirred in the powder dispersion tank 2, the second stirring of the mixed material after the initial stirring is carried out through the powder feeding tank 19. On the one hand, the mixing pressure of the coating liquid preparation tank 1 can be effectively reduced. On the other hand, the dispersion efficiency and dispersion uniformity of the powder raw material in water can be effectively improved, and the mixing efficiency of the coating liquid can be effectively improved, and the homogenization degree of the coating liquid can be improved.

[0037] Same as the on-line mixing operation, in the off-line mixing operation, the discharge port of the second transfer pump 4 is also communicated with the upper feed port of the powder dispersion tank 2 through a feed branch pipe 10. A fourth valve 14 is installed at one end of the feed branch pipe 10 close to the upper feed port of the powder dispersion tank 2, so as to facilitate the real-time re-injection of a part of the mixed liquid pumped out by the second transfer pump 4 into the powder dispersion tank 2 through the feed branch pipe 10, so that the powder dispersion tank 2 forms a self-circulation loop. At the same time, the impact of the re-injected mixed liquid flow on the mixed liquid in the powder dispersion tank 2 can promote stirring, thereby effectively improving the dispersion efficiency and dispersion uniformity of the powder raw material in water.

[0038] The working process of the present utility model:

[0039] During the on-line mixing operation, as Figure 3 、 Figure 4 shown, the first valve 11, the second valve 12, the third valve 13, and the fourth valve 14 are opened. The first transfer pump 3 pumps the tobacco concentrate pre-stored in the coating liquid preparation tank 1 to the powder dispersion tank 2. At the same time, the powder raw material is added to the powder dispersion tank 2 through the feed hopper 6. Under the stirring action of the paddle stirrer 7 and the anchor stirrer 8, the powder raw material and the tobacco concentrate are initially mixed in the powder dispersion tank 2. Subsequently, the second transfer pump 4 pumps the mixed liquid back to the coating liquid preparation tank 1, so that the powder raw material and the tobacco concentrate are secondarily mixed in the coating liquid preparation tank 1 and stirred by the paddle stirrer 7. Subsequently, the mixed liquid is pumped to the powder dispersion tank 2 by the first transfer pump 3 again, and so on in a cycle. The feed hopper 6 continuously feeds materials until the feeding amount reaches the preset value. At the same time, a part of the mixed liquid pumped out by the second transfer pump 4 is re-injected into the powder dispersion tank 2 in real time through the feed branch pipe 10, so that the powder dispersion tank 2 forms a self-circulation loop. Subsequently, continuous cyclic mixing is carried out under the action of the first transfer pump 3 and the second transfer pump 4 until the coating liquid meets the coating process requirements. Subsequently, the first valve 11, the second valve 12, and the fourth valve 14 are closed, and the coating liquid is pumped to the coating liquid preparation tank 1 for standby by the second transfer pump 4. Or the first valve 11, the second valve 12, and the fourth valve 14 are continuously opened, and continuous mixing operation is carried out while the finished coating liquid is transported to the coating process for use.

[0040] During the off-line mixing operation, as Figure 5 、Figure 6 As shown, the third valve 13, the fourth valve 14, the fifth valve 18, the sixth valve 21, the seventh valve 22, and the three-way valve 23 are opened, and the tobacco concentrate is pre-stored in the coating liquid preparation tank 1. Water is injected into the powder dispersion tank 2 through the water injection pipe 16, and powder raw materials are added through the feed hopper 6. Under the stirring action of the paddle stirrer 7 and the anchor stirrer 8, the powder raw materials and water are initially mixed and stirred in the powder dispersion tank 2. A part of the mixed liquid is pumped into the powder feeding tank 19 by the second transfer pump 4 for buffering and secondary stirring, and a part is pumped into the coating liquid preparation tank 1 to be mixed with the tobacco concentrate. At the same time, the mixed material in the powder feeding tank 19 is pumped by the third transfer pump 20 to be mixed again with the mixed material to be sent into the coating liquid preparation tank 1 and then transported to the coating liquid preparation tank 1, so that the powder raw materials, water, and tobacco concentrate are mixed in the coating liquid preparation tank 1 and fully stirred and blended by the paddle stirrer 7 until the coating liquid meets the coating process requirements, then the operation is stopped and the coating liquid is stored in the coating liquid preparation tank 1 for standby.

[0041] The utility model can, by changing the on / off state of the valves and the start / stop of the transfer pumps, select to perform on-line mixing operation or off-line mixing operation according to the coating requirements of the products in the coating process, effectively improving the adaptability of the coating liquid mixing operation to different coating requirements. The coating liquid has good mixing effect, high mixing efficiency, high homogenization degree, and is simple to operate, convenient to use, and has a high degree of automation. Specifically, for powder raw materials that are relatively easy to dissolve and can be directly mixed with the tobacco concentrate, and for the mixing operation of coating liquids with a short reserved mixing time in the coating process, on-line mixing operation is selected; while for powder raw materials that are relatively difficult to dissolve, which require the powder raw materials to be fully mixed with water first and then mixed with the tobacco concentrate, and for the mixing operation of coating liquids with a long reserved mixing time in the coating process, off-line mixing operation is selected.

[0042] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the utility model and not to limit them. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. An automatic mixing device for preparing a powder coating liquid for papermaking-reconstituted tobacco, characterized in that: The automatic mixing device for preparing the powder coating liquid for reconstituted tobacco by the papermaking method includes a coating liquid preparation tank (1), a powder dispersion tank (2), a first transfer pump (3), a second transfer pump (4), a feed pipe (5), a feed hopper (6), a paddle stirrer (7), and an anchor stirrer (8). The coating liquid preparation tank (1) is used to store tobacco concentrate and finished coating liquid. The discharge port of the coating liquid preparation tank (1) is connected to a first transfer pump (3) through a feed pipe (9). The first transfer pump (3) is connected to the upper feed port of the powder dispersion tank (2) through a feed pipe (9). A first valve (11) and a second valve (12) are respectively installed on the feed pipes (9) at both ends of the inlet and outlet of the first transfer pump (3). The upper end of the powder dispersion tank (2) is connected to a feed hopper (6) for adding powder raw materials through a feed pipe (5). The discharge port of the powder dispersion tank (2) is connected to a second transfer pump (4) through a feed pipe (9). The second transfer pump (4) is connected to the upper feed port of the coating liquid preparation tank (1) through a feed pipe (9). A third valve (13) is installed on the feed pipe (9) between the second transfer pump (4) and the powder dispersion tank (2). The discharge port of the second transfer pump (4) is also connected to the upper feed port of the powder dispersion tank (2) through a feed branch pipe (10). A fourth valve (14) is installed at one end of the feed branch pipe (10) close to the upper feed port of the powder dispersion tank (2). At least one paddle stirrer (7) is arranged in the coating liquid preparation tank (1), and an anchor stirrer (8) and at least one paddle stirrer (7) are arranged in the powder dispersion tank (2).

2. The automatic mixing device for preparing the powder coating liquid for papermaking reconstituted tobacco according to claim 1, wherein: The feed hopper (6) is arranged on the upper floor slab, and the feed pipe (5) penetrates through the floor slab. An electronic belt scale (15) for real-time weighing and metering of the powder raw materials is also arranged above the feed hopper (6).

3. An automatic mixing device for preparing a powder coating liquid for papermaking reconstituted tobacco, according to claim 1, characterized in that: The anchor stirrer (8) includes a first driving motor (801), a first stirring shaft (802), and anchor-shaped scrapers (803). The first driving motor (801) is drivingly connected to the first stirring shaft (802), and anchor-shaped scrapers (803) are symmetrically installed on both sides of the first stirring shaft (802). The structure of the anchor-shaped scrapers (803) matches the inner wall structure of the powder dispersion tank (2).

4. An automatic mixing device for preparing a powder coating liquid for papermaking-based reconstituted tobacco, according to claim 1 or 3, characterized in that: The paddle stirrer (7) includes a second driving motor (701), a second stirring shaft (702), and stirring blades (703). The second driving motor (701) is drivingly connected to the second stirring shaft (702), and at least two groups of stirring blades (703) are arranged in an array along the axial direction of the second stirring shaft (702).

5. An automatic mixing device for preparing a powder coating liquid for papermaking reconstituted tobacco, according to claim 1, characterized in that: The upper feed inlet of the powder dispersion tank (2) is also communicated with a water storage tank (17) through a water injection pipe (16), and a fifth valve (18) is installed on the water injection pipe (16). The feeding branch pipe (10) is also communicated with a powder feeding liquid tank (19) through a feeding pipe (9). The discharge port of the powder feeding liquid tank (19) is communicated with a third liquid transfer pump (20) through a feeding pipe (9). Sixth valves (21) and seventh valves (22) are respectively installed on the feeding pipes (9) at both ends of the inlet and outlet of the powder feeding liquid tank (19). A three-way valve (23) is communicated on the feeding pipe (9) between the discharge port of the powder dispersion tank (2) and the upper feed inlet of the coating liquid preparation tank (1). One of the feed inlets of the three-way valve (23) is communicated with the discharge port of the third liquid transfer pump (20). At least one paddle stirrer (7) is arranged in the powder feeding liquid tank (19).

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