System for preparing straw yellow silage feed by using enzyme preparation

Abstract

The utility model relates to a system for preparing straw yellow corn silage through an enzyme preparation, the system comprises a feeding device, a puffing device, a wrapping device and a first feeding device, the feeding device is configured to be used for storing corn straw; the first conveying unit is used for conveying corn straws from the feeding device to the bulking device; the puffing device is connected with the wrapping device through a second conveying unit; the first feeding device is communicated with the second conveying unit through a feeding pipeline, the feeding pipeline comprises a main pipeline and a plurality of branch pipelines, the plurality of branch pipelines extend from one end of the second conveying unit to the other end of the second conveying unit, an outlet of each branch pipeline is provided with a spraying device, and the spraying devices are constructed to be used for spraying an enzyme preparation. According to the system for preparing the straw yellow corn silage feed from the enzyme preparation, the production efficiency of the yellow corn silage feed is improved, the production cost is reduced, the content of beneficial bacteria in the feed is increased by using the enzyme preparation, and the nutritional value and the stability of a final product are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of feed production, and more particularly, the present disclosure relates to a system for preparing straw silage feed by using enzyme preparation. BACKGROUND

[0002] As a high-quality livestock feed, silage feed is a product that is converted from crop straw (such as corn straw) through a specific processing technology, is more easily digestible, has a higher nutritional value, and realizes effective utilization of agricultural waste. However, the product produced by the existing silage feed production device is unstable in quality, the nutritional value of the feed is not high, the production efficiency is low, the lack of automation makes the production process rely on a large amount of manual intervention, increases the operation complexity and labor cost, and at the same time affects the continuity and stability of production. CONTENT OF THE INVENTION

[0003] Therefore, the present disclosure provides a system for preparing straw silage feed by using enzyme preparation to solve the technical defects in the prior art.

[0004] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0005] The present disclosure provides a system for preparing straw silage feed by using enzyme preparation, comprising:

[0006] A feeding device configured to store corn straw;

[0007] A puffing device connected to the feeding device through a first conveying unit, the first conveying unit conveying the corn straw from the feeding device to the puffing device;

[0008] A wrapping device connected to the puffing device through a second conveying unit;

[0009] A first feeding device connected to the second conveying unit through a feeding pipeline, the feeding pipeline comprising a main pipeline and a plurality of branch pipelines, the plurality of branch pipelines extending from one end of the second conveying unit to the other end, and each branch pipeline being provided with a spraying device at its outlet, the spraying device being configured to spray enzyme preparation.

[0010] In an embodiment of the present disclosure, a spiral stirring mechanism is arranged in the second conveying unit, the spiral stirring mechanism being configured to mix and convey the corn straw and the enzyme preparation.

[0011] In an embodiment of the present disclosure, a crushing device is further included, the crushing device being connected to the feeding device through a third conveying unit, the crushing device being configured to crush the corn straw.

[0012] In one embodiment of the present disclosure, the pulverizing device is equipped with a pretreatment unit, which comprises a loading interface configured to cooperate with a loading mechanism; the pretreatment unit is further provided with a size adjusting mechanism configured to adjust the size of the loading interface.

[0013] In one embodiment of the present disclosure, the pulverizing device is provided with a dust removal system, which comprises a dust suction hood located above the inner cavity of the pulverizing device and connected to a filter through a dust suction pipeline.

[0014] In one embodiment of the present disclosure, the pulverizing device is built-in with a screening assembly, which comprises a screen configured to screen the corn stalks.

[0015] In one embodiment of the present disclosure, a second feeding device is arranged between the feeding device and the puffing device, which is connected to the first conveying unit and configured to add nutrients to the first conveying unit.

[0016] In one embodiment of the present disclosure, the puffing device is provided with a temperature control system configured to control the temperature in the puffing device.

[0017] In one embodiment of the present disclosure, the puffing device is provided with a cooling device at the discharge port, which is configured to cool the puffed corn stalks.

[0018] In one embodiment of the present disclosure, an adjusting valve is arranged between the main pipeline and the branch pipelines, which is configured to regulate the amount of enzyme preparation sprayed in each branch pipeline.

[0019] The system for preparing straw silage feed by enzyme preparation provided by the present disclosure not only improves the production efficiency of silage feed and reduces the production cost, but also enhances the content of beneficial bacteria in the feed by using enzyme preparation, reduces the waste of straw, improves the nutritional value of the final product and the immunity of the feeding animals, and has important practical significance for the scientific and comprehensive utilization of agricultural waste.

[0020] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a system for preparing straw silage feed by enzyme preparation provided by one embodiment of the present disclosure;

[0022] Figure 2 For Figure 1 Enlarged schematic view at circle A.

[0023] 1 - feeding device; 2 - puffing device; 3 - first conveying unit; 4 - wrapping device; 5 - second conveying unit; 6 - first dosing device; 7 - dosing duct; 8 - main duct; 9 - branch duct; 10 - spraying device; 11 - helical stirring mechanism; 12 - grinding device; 13 - third conveying unit; 14 - second dosing device. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments are not limiting to the scope of the present disclosure unless specifically stated otherwise.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0026] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification as appropriate.

[0027] It should be noted that like reference numerals and letters refer to like items throughout the attached drawings, and as a result, further discussion of such items is unnecessary in subsequent drawings.

[0028] The specific embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0029] In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used to describe relative positions between the relevant parts, and do not limit the absolute positions of the relevant parts.

[0030] In this document, "first", "second", and the like are used to distinguish between the relevant parts from each other, and do not indicate importance and order, and the premise of each other.

[0031] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use, etc.

[0032] The system for preparing straw yellow silage by enzyme preparation provided by the present disclosure comprises a feeding device, a puffing device, a wrapping device and a first feeding device, wherein the feeding device is configured to store corn straw; the puffing device is connected with the feeding device through a first conveying unit, and the first conveying unit conveys the corn straw from the feeding device to the puffing device; the puffing device is connected with the wrapping device through a second conveying unit; the first feeding device is connected with the second conveying unit through a feeding pipeline, and the feeding pipeline comprises a main pipeline and a plurality of branch pipelines, the plurality of branch pipelines extend from one end of the second conveying unit to the other end, and the outlet of each branch pipeline is provided with a spraying device configured to spray enzyme preparation.

[0033] The system for preparing straw yellow silage by enzyme preparation provided by the present disclosure not only improves the production efficiency of yellow silage and reduces the production cost, but also enhances the content of beneficial bacteria in the feed by using enzyme preparation, thereby improving the nutritional value and stability of the final product.

[0034] For the convenience of understanding, the specific structure and working principle of the system for preparing straw yellow silage by enzyme preparation of the present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with an embodiment. Figures 1 to 2

[0035] As shown in Figures 1 to 2 , the present disclosure relates to a system for preparing straw yellow silage by enzyme preparation, comprising: a feeding device 1 configured to store corn straw; a puffing device 2 connected with the feeding device 1 through a first conveying unit 3, and the first conveying unit 3 conveys the corn straw from the feeding device 1 to the puffing device 2; a wrapping device 4 connected with the puffing device 2 through a second conveying unit 5; and a first feeding device 6 connected with the second conveying unit 5 through a feeding pipeline 7, wherein the feeding pipeline 7 comprises a main pipeline 8 and a plurality of branch pipelines 9, the plurality of branch pipelines 9 extend from one end of the second conveying unit 5 to the other end, the outlet of each branch pipeline 9 is provided with a spraying device 10 configured to spray enzyme preparation.

[0036] Specifically, the corn straw used in the present disclosure is straw that has been dried and has a low water content. The feeding device 1 is used to store these corn straws and ensure a stable and continuous material input flow for subsequent processing steps. The corn straw output from the feeding device 1 is conveyed to the puffing device 2 for processing by the first conveying unit 3. In this process, the first conveying unit 3 can take many different forms, such as a belt conveyor, a screw conveyor, a bucket elevator or a pneumatic conveying system, and the specific choice depends on the actual requirements and application scenarios. In this embodiment, a belt conveyor is selected for conveying.

[0037] ​When the corn stalks enter the puffing device 2, they will undergo a series of physical processes such as heating and pressurization. In this embodiment, the puffing device 2 is a high-temperature puffing machine. In the high-temperature puffing machine, the moisture inside the corn stalks will become superheated steam under high pressure. Once the pressure is suddenly released, these water vapors rapidly expand and vaporize, causing the cell walls to rupture, thereby transforming the originally relatively hard stalk structure into smaller, softer fibers. This change not only increases the surface area of the material, but also improves its texture, making the final yellow silage more palatable and easier for livestock to digest and absorb. At the same time, the puffing process also helps to destroy certain anti-nutritional factors, improve the nutritional value of the feed, and promote subsequent chemical or biological reaction processes that may be involved.

[0038] After the puffing process, the corn stalks are transported from the puffing device 2 to the wrapping device 4 by the second conveying unit 5 for packaging. Before wrapping, enzyme preparations need to be added to further improve the quality and digestibility of the feed. The enzyme preparations in this embodiment contain cellulase, hemicellulase, and lignin-degrading enzymes, which can specifically act on the main components of plant cell walls - cellulose, hemicellulose, and lignin. Among them, cellulase can decompose cellulose into glucose monomers, allowing the conversion of fibrous material that is not easily digested by animals into small molecules that are easily absorbed; hemicellulase is responsible for decomposing hemicellulose and converting it into soluble oligosaccharides such as arabinoxylan and xylan, thereby improving the energy value of the feed; while lignin-degrading enzymes, although difficult to completely decompose lignin, can help loosen the tight connection between lignin and cellulose, hemicellulose, thereby indirectly promoting the degradation efficiency of the other two enzymes on cellulose and hemicellulose. Through this biochemical reaction, not only can the palatability and nutritional value of the feed be improved, but also the production of harmful gases in the intestinal tract of livestock can be reduced, reducing the environmental burden.

[0039] A first feeding device 6 is arranged between the bulking device 2 and the wrapping machine, and the first feeding device 6 stores the enzyme preparation and is connected to the second conveying unit 5 through a main pipeline 8. In order to ensure that the enzyme preparation can fully act on the corn stalks, a plurality of branch pipelines 9 are arranged on the main pipeline 8, and the branch pipelines 9 extend from one end of the second conveying unit 5 to the other end. A spraying device 10 is arranged at the outlet of each branch pipeline 9, and the spraying device 10 can be a rotary nozzle, an atomizing nozzle, or a micro-porous drip irrigation system, and is not limited here. In the embodiment, the spraying device 10 is a rotary nozzle, which is suitable for uniform covering of large-particle materials and can provide a wide spraying angle to ensure that the enzyme preparation can contact the corn stalks. By arranging the spraying device 10 in the second conveying unit 5, the second unit can realize mixing with the enzyme preparation during the conveying of the corn stalks, thereby improving the production efficiency; and ensuring that the enzyme preparation and the corn stalks are fully and uniformly mixed, avoiding the problems of local high or low concentration, reducing the waste of enzyme preparation, and improving the use efficiency; due to the uniform mixing, the quality of the final product is more consistent, which is beneficial to maintaining the quality of the yellow storage feed.

[0040] As shown in the drawings, Figure 1 In one embodiment of the present disclosure, a spiral stirring mechanism 11 is arranged in the second conveying unit 5, and the spiral stirring mechanism 11 is configured to mix and convey the corn stalks and the enzyme preparation.

[0041] Specifically, through the rotary motion of the spiral stirring mechanism 11, the enzyme preparation can be more uniformly distributed between the corn stalks, ensuring that the corn stalks can contact the enzyme preparation with the largest area, promoting the contact between the enzyme preparation and the substrate (such as cellulose in the stalk), thereby accelerating the chemical reaction or biological conversion process. The spiral stirring mechanism 11 can also convey the mixture of the corn stalks and the enzyme preparation from the bulking device 2 to the wrapping device 4, which not only realizes the continuous movement of the material, but also reduces the risk of material damage. In addition, the spiral stirring mechanism 11 can also improve the flowability and compactness of the material, which is helpful for the subsequent wrapping step, such as helping to form a tight and uniform wrapping in the subsequent packaging process. In order to cooperate with the use of the spraying device 10, the spiral stirring mechanism 11 can also control the speed of the material by adjusting the rotating speed, thereby cooperating with the first feeding device 6 to ensure that the corn stalks per unit area contact an equal amount of enzyme preparation, thereby improving the stability of the subsequent product.

[0042] In one embodiment of the present disclosure, a crushing device 12 is also included, and the crushing device 12 is connected to the feeding device 1 through a third conveying unit 13, and the crushing device 12 is configured to crush the corn stalks.

[0043] Because the initial corn stalks are relatively large, they need to be pre-treated, i.e., crushed, before entering the feeding device 1. The crushing device 12 is located at the front end of the entire system. It crushes the corn stalks into smaller segments. The crushed corn stalks are easier to move through the conveying device and reduce the risk of blockage during the conveying process, allowing the corn stalks to enter the puffing device 2 more smoothly.

[0044] In one embodiment of this disclosure, the crushing device 12 is equipped with a pretreatment unit, which includes a loading interface configured to cooperate with a loading mechanism; the pretreatment unit is also provided with a size adjustment mechanism configured to adjust the size of the loading interface.

[0045] Specifically, the loading interface is the first point of contact connecting external loading equipment (such as loaders, conveyor belts, etc.) and the system interior. It ensures the safe and efficient transport of corn stalks from the outside to the crushing unit 12. By setting up the loading interface, seamless connection between the loading mechanism and the crushing unit 12 can be achieved, reducing material loss and operation time, and improving the overall system efficiency. The size adjustment mechanism allows the size of the loading interface to be adjusted according to different loading equipment or material characteristics. This not only improves the system's compatibility but also enables it to handle different size requirements of different batches of raw materials. By changing the size of the loading interface, the material flow rate into the system can be controlled, thereby better matching the capacity of subsequent processing steps. For example, when processing larger volumes of stalks, the interface can be enlarged appropriately; while when processing smaller or finer materials, the interface can be reduced to maintain an appropriate feed rate. This flexibility allows the system to adapt to the needs of farms or processing plants of various sizes and types, enhancing its market competitiveness.

[0046] In one embodiment of this disclosure, the pulverizing device 12 is provided with a dust removal system, which includes a dust suction hood and a filter. The dust suction hood is located above the inner cavity of the pulverizing device 12 and is connected to the filter through a dust suction pipe.

[0047] Specifically, the dust hood is located above the inner cavity of the pulverizing device 12, ensuring that most of the dust generated during the pulverizing process is captured, minimizing dust escape into the working environment, and protecting the health and safety of workers. The dust hood effectively attracts and captures fine particulate matter suspended in the air. The dust collection duct transports the dust collected by the hood to the filter. The dust collection duct has a large diameter and appropriate curvature to prevent dust accumulation or blockage, ensuring smooth airflow. Effective dust control reduces pollution to the surrounding environment during production, lowers the risk of workers being exposed to hazardous substances, and improves occupational health and safety. Furthermore, maintaining a clean working area helps improve product purity and quality, preventing product defects caused by dust contamination.

[0048] In one embodiment of this disclosure, the crushing device 12 has a built-in screening component, which includes a screen configured to screen corn stalks.

[0049] Specifically, to further improve production efficiency and product quality, a screening component is also installed within the crushing device 12. This screening component includes a screen that can sift the crushed material according to a set aperture size, ensuring that only fine particles that meet the requirements pass through, while larger or insufficiently crushed materials are retained. Screening removes irregular fragments that are too large or too small, ensuring that the final silage has a uniform particle size, thereby improving feed quality and the digestibility and absorption by livestock. The screening component is also equipped with vibration or other forms of power-assisted structures to increase the contact opportunity between the material and the screen surface, improving screening efficiency and preventing screen clogging. After screening, the uniformity of the material improves the effectiveness of subsequent puffing, mixing, and enzyme treatment.

[0050] like Figure 1 As shown, in one embodiment of this disclosure, a second feeding device 14 is provided between the feeding device 1 and the puffing device 2. The second feeding device 14 is connected to the first conveying unit 3 and is configured to feed nutrients onto the first conveying unit 3.

[0051] To enhance the nutritional value of the final product, a second feeding device 14 is also included in the system. This second feeding device 14 can add the necessary nutrients to the transported corn stalks according to a preset ratio or requirement. These nutrients may include minerals, vitamins, amino acids, etc., to enhance the nutritional value of the feed. By adjusting the settings of the second feeding device 14, different combinations of nutrients can be selected to meet the needs of different types of livestock or specific growth stages.

[0052] Because nutrients are added during material transport, they can be distributed more evenly throughout the material flow. This on-the-spot mixing method is more efficient than post-mixing, ensuring that all corn stalks are fully exposed to nutrients. Furthermore, adding nutrients directly during transport helps prevent stratification during subsequent processing or storage, ensuring the uniformity and consistency of the final product.

[0053] In one embodiment of this disclosure, a temperature control system is provided in the puffing device 2, and the temperature control system is configured to control the temperature in the puffing device 2.

[0054] Since temperature is a crucial parameter in the puffing process, a temperature control system is installed within the puffing unit 2. This system maintains the internal temperature within a set range, ensuring stability during processing. It can also be quickly adjusted to handle any temperature fluctuations, guaranteeing a stable processing environment even under changing external conditions. Temperature control promotes the effective conversion of indigestible components such as cellulose, improving the nutritional value of the feed. Appropriate temperatures help alter the physical structure of corn stalks, making them more digestible and enhancing their palatability and water retention capacity.

[0055] In one embodiment of this disclosure, a cooling device is provided at the outlet of the puffing device 2, and the cooling device is configured to cool the temperature of the puffed corn stalks.

[0056] Because the temperature of the puffed corn stalks is high, if they are not cooled in time, the material may deteriorate or lose some of its nutritional value. A cooling device is installed at the discharge port of the puffing unit 2. This device can quickly reduce the material temperature to a safe range, preventing heat damage. High temperatures can cause the material to soften or deform, affecting its physical structure. Effective cooling allows the puffed corn stalks to maintain an ideal shape and firmness, facilitating subsequent packaging and transportation. Furthermore, excessively high temperatures accelerate the evaporation of moisture from the material, while cooling helps maintain a suitable moisture content, ensuring the feed's water retention capacity. In this embodiment, the cooling device rapidly reduces the surface temperature of the material through natural wind cooling or forced air cooling, minimizing the time it takes for heat to conduct to the interior. The cooling device is also equipped with sensors and a control system that can automatically adjust the cooling intensity according to actual needs to ensure optimal results. It can also monitor the material temperature in real time and provide detailed operating data, facilitating quality management and problem traceability.

[0057] In one embodiment of this disclosure, a regulating valve is provided between the main pipe 8 and the branch pipe 9, and the regulating valve is configured to regulate the amount of enzyme preparation sprayed in each branch pipe 9.

[0058] To control the amount of enzyme preparation sprayed, regulating valves are installed between the main pipeline 8 and the branch pipelines 9. These regulating valves consist of a corrosion-resistant valve body, an adjustable flow valve core, an actuator (such as electric, pneumatic, or hydraulic) to drive the valve core, sensors to monitor flow and pressure, and a controller to process feedback signals. The regulating valves adjust the flow area by changing the valve core position, thereby flexibly controlling the flow rate of enzyme preparation through each branch pipeline 9, ensuring that each spraying point receives an appropriate dosage and avoiding over- or under-dosing. Built-in sensors and controllers enable closed-loop control, adjusting the valve core position in real time to maintain the set flow rate while ensuring system reliability and durability, preventing leaks and blockages. This design ensures the efficient operation of the enzyme preparation spraying system, providing a solid guarantee for quality control in silage production.

[0059] The system for preparing straw silage using enzyme preparations disclosed herein not only improves the production efficiency of silage and reduces production costs, but also enhances the content of beneficial bacteria in the feed by using enzyme preparations, reducing straw waste, improving the nutritional value of the final product and the immunity of the fed animals. It has important practical significance for the scientific and comprehensive utilization of agricultural waste.

[0060] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this disclosure is not limited to the described order of actions, because according to this disclosure, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0061] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0062] The preferred embodiments disclosed above are merely illustrative of this disclosure. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this disclosure. These embodiments are selected and specifically described in this disclosure to better explain the principles and practical applications of this disclosure, thereby enabling those skilled in the art to better understand and utilize this disclosure. This disclosure is limited only by the claims and their full scope and equivalents.

Claims

1. A system for preparing straw silage using enzyme preparations, characterized in that, include: Feeding device (1), the feeding device (1) is configured to store corn stalks; The puffing device (2) is connected to the feeding device (1) through a first conveying unit (3). The first conveying unit (3) conveys the corn stalks from the feeding device (1) to the puffing device (2). The wrapping device (4) is connected to the puffing device (2) via a second conveying unit (5); The first feeding device (6) is connected to the second conveying unit (5) through a feeding pipe (7). The feeding pipe (7) includes a main pipe (8) and multiple branch pipes (9). The multiple branch pipes (9) extend from one end of the second conveying unit (5) to the other end. Each branch pipe (9) has a spraying device (10) at its outlet. The spraying device (10) is configured to spray enzyme preparations.

2. The system for preparing straw silage using an enzyme preparation according to claim 1, characterized in that, The second conveying unit (5) is provided with a spiral stirring mechanism (11), which is configured to mix and convey the corn stalks and the enzyme preparation.

3. The system for preparing straw silage using an enzyme preparation according to claim 1, characterized in that, It also includes a crushing device (12), which is connected to the feeding device (1) via a third conveying unit (13), and the crushing device (12) is configured to crush the corn stalks.

4. The system for preparing straw silage using an enzyme preparation according to claim 3, characterized in that, The crushing device (12) is equipped with a pretreatment unit, which includes a loading interface configured to cooperate with a loading mechanism; the pretreatment unit is also provided with a size adjustment mechanism configured to adjust the size of the loading interface.

5. The system for preparing straw silage using an enzyme preparation according to claim 3, characterized in that, The pulverizing device (12) is equipped with a dust removal system, which includes a dust suction hood and a filter. The dust suction hood is located above the inner cavity of the pulverizing device (12) and is connected to the filter through a dust suction pipe.

6. The system for preparing straw silage using an enzyme preparation according to claim 3, characterized in that, The crushing device (12) has a built-in screening component, which includes a screen configured to screen the corn stalks.

7. The system for preparing straw silage using an enzyme preparation according to claim 1, characterized in that, A second feeding device (14) is provided between the feeding device (1) and the puffing device (2). The second feeding device (14) is connected to the first conveying unit (3). The second feeding device (14) is configured to add nutrients to the first conveying unit (3).

8. The system for preparing straw silage using an enzyme preparation according to claim 1, characterized in that, The puffing device (2) is equipped with a temperature control system configured to control the temperature inside the puffing device (2).

9. The system for preparing straw silage using an enzyme preparation according to claim 1, characterized in that, A cooling device is provided at the outlet of the puffing device (2), and the cooling device is configured to cool the temperature of the puffed corn stalks.

10. The system for preparing straw silage using an enzyme preparation according to claim 1, characterized in that, A regulating valve is provided between the main pipe (8) and the branch pipe (9), and the regulating valve is configured to regulate the amount of enzyme preparation sprayed in each branch pipe (9).

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