Equipment for producing straw fiber bundles through compressed air throat pipe confluence type cavitation dissociation

Abstract

The utility model discloses equipment for producing straw fiber bundles through compressed air throat pipe confluence type cavitation dissociation, which comprises a steel pressure container used for containing straw materials and providing space for spraying of the straw materials, a feeding bin is connected above the steel pressure container, a feeding screw is arranged at the bottom of the feeding bin, and the feeding screw is connected with the steel pressure container. A horizontal conveying screw used for horizontally pushing straw materials is arranged in the steel pressure container, the discharging end of the horizontal conveying screw is connected with a collecting bin used for collecting dissociated straw fiber bundles, a channel for the straw materials to pass through is arranged between the discharging end and an inlet of the collecting bin, and the cross section of the channel is in the state that the straw materials are narrowed first and then widened. Straw tissues are dissociated instantly in the process that the straw materials are sprayed into the collecting bin due to the change of the sectional area of the compressed air in the steel pressure container, and a straw fiber bundle product is formed. The assembly is improved horizontal equipment, and is higher in efficiency, low in energy consumption, simple in structure and lower in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of straw fiber bundle preparation, and more specifically to equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation. Background Art

[0002] The rapid development of the biomanufacturing industry has caused traditional petroleum-based raw materials to exit the market, and the transition window period has arrived, where new bio-based raw materials will enter the market. In the sub-sector, non-food bio-based chemicals cover the development of comprehensive utilization technology, which is to refine non-food biomass fibers to obtain small molecule raw materials in various functional chemicals, and then perform secondary processing and resynthesis to produce polymer raw material products.

[0003] The biomanufacturing industry requires equipment for the comprehensive utilization of straw non-grain bio-based materials, separation and purification technology and material preparation, detection and analysis, fermentation optimization control, etc. These are all equipment manufacturing that urgently needs to solve key common technical "difficulties" and "bottlenecks".

[0004] Traditional production of straw fiber bundles mostly uses vertical equipment, which has high power and energy consumption. The straw material is not pretreated, the treatment is not thorough, and the production efficiency is low. The technical performance of the equipment urgently needs to be optimized and improved to meet the needs of the rapid development of biomanufacturing. Summary of the invention

[0005] Technical problem to be solved by the utility model: The purpose of the utility model is to overcome the technical problems of high power, high energy consumption, incomplete treatment and low production efficiency of traditional equipment for producing straw fiber bundles in the prior art, and to propose a compressed air throat converging cavitation separation equipment for producing straw fiber bundles.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is: a compressed air throat converging cavitation dissociation equipment for producing straw fiber bundles, including a steel pressure vessel for accommodating straw materials and providing compressed air space for spraying straw materials, a feed bin is connected to the top of the steel pressure vessel, a feed screw is arranged at the bottom of the feed bin, a horizontal conveying screw for horizontally pushing straw materials is arranged in the steel pressure vessel, and the discharge end of the horizontal conveying screw is connected to a collecting bin for collecting dissociated straw fiber bundles, and the cross section of the channel between the discharge end and the entrance of the collecting bin for the passage of straw materials presents a state of first narrowing and then widening, so that the compressed air in the steel pressure vessel causes the straw materials to be instantly dissociated due to the change in cross-sectional area and is sprayed into the collecting bin, forming a straw fiber bundle product with dissociated straw tissue.

[0007] As a further improvement of the utility model, the discharge end of the horizontal conveying screw is connected to the inlet end of the collecting bin through a Laval three-section component. The Laval three-section component includes a convergent section connected to the discharge end of the horizontal conveying screw, an expansion collecting section connected to the inlet end of the collecting bin, and a narrow throat section horizontally arranged between the convergent section and the expansion collecting section.

[0008] As a further improvement of the utility model, the cross section of the channel where the convergent section is located gradually converges, the cross section of the channel where the expansion and collection section is located gradually expands, and there is a critical section with the smallest cross-sectional area in the narrow throat section between the convergent section and the expansion and collection section.

[0009] As a further improvement of the utility model, a ball valve is connected to the narrow throat section, and the ball valve sets the corresponding gas pressure value according to the dissociation pressure value of different straw fibers; when the dissociation pressure value reaches the set value, the ball valve opens, and the airflow pushes the straw fibers to be sprayed into the collection bin.

[0010] As a further improvement of the utility model, the steel pressure vessel is arranged horizontally, one end of which is the gas source end and the other end is the feeding end. The horizontal conveying screw is located in the feeding end, and the gas at the gas source end is pressure-adjustable normal temperature compressed air provided by an air compressor.

[0011] As a further improvement of the utility model, a sealing system is formed by an air storage bag, an air compressor and a ball valve.

[0012] As a further improvement of the utility model, a conical plunger is provided at the discharge port of the feed bin, and the feed spiral continuously rotates and pushes the straw material to form a straw cock, and a sealing pair is formed between the straw cock, the lip of the discharge port of the feed bin and the conical plunger.

[0013] As a further improvement of the utility model, the horizontal conveying screw in the feeding end performs a horizontal conveying action on the straw material and simultaneously forms a pre-treatment section for kneading and spinning the straw material and for mutual friction between the straw materials.

[0014] As a further improvement of the present invention, a collecting bin discharging screw for continuous discharging is provided at the bottom of the collecting bin. Beneficial Effects

[0015] 1. The utility model provides a compressed air throat converging type cavitation separation equipment for producing straw fiber bundles. The tubular steel pressure vessel is composed of an air storage bag, an air compressor and a ball valve to form a sealing system. This sealing system ensures that the process pressure value in the tubular steel pressure vessel reaches the set requirement to form a container that is sprayed together with the straw material.

[0016] 2. The utility model provides a compressed air throat converging type cavitation dissociation equipment for producing straw fiber bundles. As one of the key components of the equipment system to complete the dissociation of straw fibers, the Laval three-section component has a structural design of first converging and then expanding, so that when continuous high-pressure gas accompanies the straw material through the narrow throat section, the airflow in the channel where the narrow throat section is located is accelerated and reaches supersonic speed at the airflow outlet. The airflow together with the straw material is pushed to the expansion collection section, gradually expands through the expansion collection section, and the flow rate is reduced, thereby achieving the purpose of dissociating the straw fiber bundles of vascular plants.

[0017] 3. The utility model provides a compressed air throat converging type cavitation separation equipment for producing straw fiber bundles. The inlet end of the collecting bin is the expansion collecting section of the Laval three-section component. The expansion collecting section obtains a strong expansion ejection force due to the sudden change of the cross-sectional area. The vascular plant materials such as straw undergo cavitation power changes in the expansion section due to the change of the ejection cross-sectional area along with the airflow, resulting in different water molecule masses on the surface of the straw material itself, forming tiny bubbles, thereby enhancing the dissociation effect of the material.

[0018] 4. The utility model provides a compressed air throat converging type cavitation dissociation equipment for producing straw fiber bundles. The ball valve is set with different gas pressure values ​​according to the dissociation pressure values ​​of different straw fibers. The ball valve can be controlled to complete intermittent cycle opening, closing and releasing functions according to the process pressure value of the dissociation straw. When the dissociation pressure value reaches the set value, the ball valve opens. At this time, the airflow pushes the straw fibers to be sprayed into the collection bin, completing the dissociation of the straw fibers and obtaining a straw fiber bundle product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the equipment for producing straw fiber bundles of the utility model;

[0020] Explanation of the symbols in the schematic diagram:

[0021] 1. Steel pressure vessel; 11. Horizontal conveying screw; 2. Feed bin; 21. Feed port; 22. Feed screw; 23. Feed bin outlet; 24. Conical plunger; 25. Straw cock; 3. Collection bin; 31. Collection bin outlet screw; 4. Laval three-section component; 41. Converging section; 42. Narrow throat section; 43 Expanding collection section; 5. Ball valve; 6. Sealing control mechanism; 7. Air storage bag; 8. Air compressor. DETAILED DESCRIPTION

[0022] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and specific implementation methods.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] A device for producing straw fiber bundles by compressed air throat converging cavitation separation comprises a tubular steel pressure vessel 1 capable of bearing pressure, wherein a feed bin 2 is connected to the top of the tubular steel pressure vessel 1, and a feed port 21 is formed above the feed bin 2, through which primary materials cut into inch-sized straws enter; a feed screw 22 is provided at the bottom of the feed bin 2, and the feed screw 22 spirally conveys the primary straw materials in a vertical manner, and a feed bin discharge port 23 is provided at the lower end of the feed screw 22, and the straw materials are continuously pushed to the feed bin discharge port 23 at the bottom by the feed screw 22 and then enter the tubular steel pressure vessel 1.

[0027] The tubular steel pressure vessel 1 is arranged horizontally, one end of which is the gas source end and the other end is the material delivery end. In this embodiment, the left end of the tubular steel pressure vessel 1 is the gas source end and the right end is the material delivery end. The gas at the gas source end is the pressure-adjustable normal temperature compressed air provided by the air compressor 8. Preferably, the gas source end can be connected to the compressed air storage bag 7, and the air storage bag 7 provides the gas source through the air compressor 8. The weight of the tubular steel pressure vessel 1 is supported by the equipment at the bottom.

[0028] A horizontal conveying screw 11 is provided in the feeding end to convey the straw material transported by the feeding bin 2 in a horizontal manner. The cross section of the discharge end of the horizontal conveying screw 11 gradually converges and is connected to the collecting bin 3 through the Laval three-section component 4. The Laval three-section component 4 is designed according to a structure that converges first and then expands. When the straw fiber passes through the Laval three-section component 4, the compressed air will change due to the change in the cross-sectional area, causing the airflow to change from subsonic to sonic and then to supersonic. When the straw fiber passes through the expansion section, the gas volume is instantly expanded, and the gas compressed in the straw vascular tube expands and does work, tearing the straw along the direction of the straw fiber to form a fiber bundle product, which is then sprayed into the collecting bin 3, so that the straw material completes the process of dissociating from inch segments into fiber bundles in the collecting bin. A collecting bin discharge screw 31 for continuous discharge is provided at the bottom of the collecting bin 3, and the dissociated fiber bundle is finally transported to the collecting bin discharge port by the collecting bin discharge screw 31.

[0029] At the discharge port 23 of the feed bin, a conical plunger 24 is also provided which matches the gap with the lip of the discharge port 23 of the feed bin. Generally, the straw is cut into inch-sized raw materials with a length of about 1 inch (3.2 cm) by a grass cutter and put into the feed port 21 of the feed bin. The feed screw 22 pushes the inch-sized raw materials to the discharge port 23 of the feed bin. At the discharge port 23 of the feed bin, the feed screw 22 continuously rotates and pushes the straw material to form a straw plug 25. The straw plug 25 forms a sealing pair with the lip of the discharge port of the feed bin and the conical plunger 24, sealing the discharge port 23 of the feed bin to achieve the purpose of auxiliary sealing, so that the tubular steel pressure vessel 1 can obtain the process pressure holding value required for dissociating the straw fiber bundles.

[0030] The bottom of the conical plunger 24 is connected to a sealing control mechanism 6, which is a sealing component for automatically and quantitatively controlling the discharge port of the feed bin. The conical plunger 24 cooperates with the sealing control mechanism 6 to better achieve the purpose of assisting the sealing of the discharge port 23 of the feed bin.

[0031] The Laval three-section component includes a convergent section 41 with a gradually narrowing cross section connected to the discharge end of the horizontal conveying screw, an expanding collection section 43 with a gradually expanding cross section connected to the inlet end of the collection bin, the expanding collection section 43 adopts a 6° to 12° taper to prevent the fluid from separating from the pipe wall, and a narrow throat section 42 arranged horizontally between the convergent section 41 and the expanding collection section 43. The cross-sectional area of ​​the narrow throat section 42 is the smallest compared to the convergent section 41 and the expanding collection section 43, and thus becomes the thinnest section in the Laval three-section component. One end of the narrow throat section 42 is connected to the convergent section 41, and the other end is connected to the expanding collection section 43. The narrow throat section 42 has a critical cross section, at which its cross-sectional area is the smallest.

[0032] Through this design of the Laval three-section component, the cross-section of the pipe through which the straw material passes is first converged and then expanded. In the tubular steel pressure vessel 1, the compressed air is first subsonic and passes through the narrow throat section 42 to achieve the purpose of supersonic airflow. The narrow throat section 42 has the ability to increase the work of airflow density. At the same time, the airflow pressure and temperature are constantly increasing. When the compressed air flow pushes the straw material through the critical cross-section of the narrow throat section 42 and enters the expansion collection section 43 of the Laval three-section component, the volume of the gas will be instantly expanded due to the sudden change of the cross-section. The gas compressed in the straw vascular tube expands and does work, tearing the straw along the direction of the straw fiber to form a fiber bundle product, and the compressed air flow is quickly sprayed into the collection bin 3 along with these straw materials.

[0033] A ball valve 5 is connected to the narrow throat section 42. The ball valve 5 is set with different gas pressure values ​​according to the different dissociation values ​​of wheat, corn, rice straw and other different fiber bundle products. When the pressure in the tubular steel pressure vessel 1 reaches the set dissociation pressure value, the ball valve 5 opens. At this time, the gas and the straw material instantly enter the expansion collection section 43 from the narrow throat section 42. The gas volume is instantly expanded, and the gas compressed in the straw fiber tube expands and does work, tearing the straw along the direction of the straw fiber to become a fiber bundle product, completing the above dissociation process.

[0034] In summary, the above-mentioned equipment for dissociating and producing straw fiber bundles provided by the utility model is different from the popular process technology route for producing straw fibers in the industry. It is an optimized horizontal equipment. After the straw material is fed from the feed bin 21, the conveyed straw material is pre-treated by the horizontal conveying screw 11. The pretreatment includes rubbing, spinning and mutual friction between the straw materials. Compared with the vertical equipment that has not undergone material pretreatment, the pressure power required for dissociating the straw tissue used by the horizontal equipment is much smaller and more energy-efficient. Moreover, this horizontal equipment has a small size, simple structure, low manufacturing cost, and is easy to popularize, and the efficiency of producing straw fiber bundle products is higher.

[0035] A method for preparing straw fiber bundles by compressed air throat converging cavitation separation, using the above-mentioned production equipment, comprises the following steps:

[0036] (1) Loading:

[0037] a. Load the straw segments of about 1 inch (3.2 cm) in length into the feed bin;

[0038] b. The feed screw starts to rotate continuously, pushing the straw segments to form a straw plug.

[0039] (2) Maintaining pressure:

[0040] a. The straw cock, the lip of the feed bin outlet, the conical plunger and the sealing control mechanism form a sealing pair to seal the feed bin outlet to prevent the pressure in the tubular steel pressure vessel from leaking out. This is an auxiliary sealing structure;

[0041] b. In addition, the tubular steel pressure vessel consists of an air storage bag, an air compressor, a ball valve and a horizontal conveying screw to form a sealing system. This system ensures that the process pressure value in the tubular steel pressure vessel meets the set requirements.

[0042] (3) Pretreatment: The horizontal conveying screw rubs and spins the conveyed straw materials and causes mutual friction between the straw materials;

[0043] (4) Release:

[0044] a. When the pressure in the steel tubular container reaches the set process pressure holding value;

[0045] b. The ball valve connected at the narrow throat section opens automatically. At this time, the straw segments in the tubular steel pressure vessel will be sprayed into the expansion collection section along with the compressed air flow.

[0046] (5) Dissociation: In the expansion and collection section, the compressed air flow is expanded and diffused. This expanded air flow can instantly dissociate the straw material tissue and form a fiber bundle product.

[0047] (6) Discharging:

[0048] a. The discharging screw of the collecting bin starts to rotate continuously, and the dissociated fiber bundle products are transported out of the collecting bin. b. The production process of the dissociated fiber bundle products of the entire equipment is completed.

[0049] Compared with the traditional process of producing straw fiber, the above preparation method adopts a horizontal conveying method, which can fully pretreat the straw material before dissociation, so that the straw material can be fully rubbed and kneaded, greatly improving the dissociation efficiency.

[0050] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A device for producing straw fiber bundles by compressed air throat converging cavitation separation, characterized in that: The invention comprises a steel pressure vessel (1) for containing straw material and providing a compressed air space for spraying the straw material. A feed bin (2) is connected to the top of the steel pressure vessel (1). A feed screw (22) is arranged at the bottom of the feed bin (2). A horizontal conveying screw (11) for horizontally pushing the straw material is arranged in the steel pressure vessel (1). A collecting bin (3) for collecting dissociated straw fiber bundles is connected to the discharge end of the horizontal conveying screw (11). A passage for the straw material to pass through is arranged between the discharge end and the entrance of the collecting bin. The cross section of the passage is in a state of first narrowing and then widening, so that the compressed air in the steel pressure vessel (1) causes the straw material to be instantly dissociated due to the change in cross-sectional area and is sprayed into the collecting bin (3), thereby forming a straw fiber bundle product with dissociated straw tissue.

2. The equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation according to claim 1 is characterized in that: The discharge end of the horizontal conveying screw (11) is connected to the inlet end of the collecting bin via a Laval three-section component (4), and the Laval three-section component (4) comprises a convergent section (41) connected to the discharge end of the horizontal conveying screw, an expansion collecting section (43) connected to the inlet end of the collecting bin, and a narrow throat section (42) arranged horizontally between the convergent section (41) and the expansion collecting section (43).

3. The equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation according to claim 2 is characterized in that: The cross section of the channel where the convergent section (41) is located gradually converges, and the cross section of the channel where the expansion and collection section (43) is located gradually expands. The narrow throat section (42) between the convergent section (41) and the expansion and collection section (43) has a critical section with the smallest cross-sectional area.

4. The equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation according to claim 2 is characterized in that: A ball valve (5) is connected to the narrow throat section (42), and the ball valve (5) sets a corresponding gas pressure value according to the dissociation pressure value of different straw fibers; when the dissociation pressure value reaches the set value, the ball valve (5) opens, and the airflow pushes the straw fibers to be sprayed into the collection bin (3).

5. The equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation according to claim 1 is characterized in that: The steel pressure vessel (1) is arranged horizontally, with one end being the gas source end and the other end being the material delivery end. The horizontal conveying screw (11) is located in the material delivery end. The gas at the gas source end is pressure-adjustable normal temperature compressed air provided by an air compressor (8).

6. The equipment for producing straw fiber bundles by compressed air throat converging cavitation separation according to claim 5 is characterized in that: The sealing system is composed of an air storage bag (7), an air compressor (8) and a ball valve (5).

7. The equipment for producing straw fiber bundles by compressed air throat converging cavitation separation according to claim 1 is characterized in that: A conical plunger (24) is provided at the feed bin outlet (23), and the feed screw (22) continuously rotates and pushes the straw material to form a straw cock (25), and a sealing pair is formed between the straw cock (25), the lip edge of the feed bin outlet (23) and the conical plunger (24).

8. The equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation according to claim 1 is characterized in that: The horizontal conveying screw (11) in the feeding end performs a horizontal conveying action on the straw material and simultaneously forms a pre-treatment section for kneading and spinning the straw material and for mutual friction between the straw materials.

9. The equipment for producing straw fiber bundles by compressed air throat converging type cavitation separation according to claim 2, characterized in that: A collecting bin discharge screw (31) for continuous discharge is provided at the bottom of the collecting bin (3).

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