Organic fertilizer fermentation device

Abstract

The utility model discloses an organic fertilizer fermentation device belongs to organic fertilizer production equipment technical field, including jar body, driving motor, stirring shaft and stirring oar, still fixedly be provided with at least one stirring arm on the stirring shaft, the radial extension length of stirring arm is greater than the rotation radius of stirring oar, the end of stirring arm is equipped with the wall scraping board, the board face shape of wall scraping board is the arc surface that is consistent with the jar body inner wall contour, and wall scraping board is in the radial of stirring shaft, its outside and jar body inner wall contact, the inside of wall scraping board is equipped with the hollow channel, the inside with stirring shaft inside of stirring arm all are equipped with the air channel that links and communicates, and this air channel communicates with hollow channel, the gas source is communicated with through the swivel joint on stirring shaft, is equipped with a plurality of aeration micropore that exposes with hollow channel communication on the working surface of wall scraping board, the utility model effectively solved the problem that the inside wall of traditional fermentation jar scales, local anaerobic and heat transfer uneven.

Description

Technical Field

[0001] This utility model relates to the technical field of organic fertilizer production equipment, specifically an organic fertilizer fermentation device. Background Technology

[0002] Fermentation is one of the key steps in the production of organic fertilizer. Through efficient fermentation equipment, microorganisms can be used to transform raw materials such as livestock and poultry manure and straw into high-quality organic fertilizer.

[0003] Existing organic fertilizer fermentation equipment typically includes a tank, a drive motor, a stirring shaft, and a stirring paddle. The drive motor rotates these components to achieve material mixing. However, in actual operation, these devices still have some problems. First, due to the viscous nature of the fermentation material, it easily adheres to the inner wall of the tank during stirring. Long-term accumulation not only wastes material but also reduces the heat transfer efficiency of the tank, thus affecting the fermentation quality. Second, existing aeration structures are mostly fixed to aeration discs at the bottom or side of the tank, with limited aeration range, resulting in uneven oxygen content in different areas of the tank, affecting the activity of microorganisms and fermentation efficiency. Although some equipment is designed with a wall scraping structure to reduce material adhesion to the inner wall of the tank, poor fit between the scraper and the inner wall, and the lack of effective buffer design, easily lead to wear on the tank wall or incomplete scraping, making the overall function of the equipment relatively simple and difficult to meet actual production and performance requirements.

[0004] In conclusion, there is an urgent need to design an organic fertilizer fermentation device that can efficiently scrape the walls and uniformly aerate. Utility Model Content

[0005] The purpose of this invention is to overcome the aforementioned technical difficulties and provide an organic fertilizer fermentation device that can efficiently scrape the wall and uniformly aerate.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an organic fertilizer fermentation device, comprising a tank, a drive motor, a stirring shaft, and a stirring paddle. At least one stirring arm is fixedly mounted on the stirring shaft. The radial extension length of the stirring arm is greater than the rotation radius of the stirring paddle. A scraper is installed at the end of the stirring arm. The scraper has an arc-shaped surface that matches the contour of the inner wall of the tank. The outer side of the scraper contacts the inner wall of the tank in the radial direction of the stirring shaft. A hollow channel is provided inside the scraper. Air passages are provided inside the stirring arm and the stirring shaft, and these air passages are connected to the hollow channel. An air source is connected to the stirring shaft through a rotary joint. Multiple aeration microholes communicating with the hollow channel are opened on the working surface of the scraper.

[0007] Furthermore, the scraper is connected to the end of the stirring arm via an elastic mounting member.

[0008] Furthermore, the elastic mounting element is a leaf spring or a compression spring.

[0009] Furthermore, the working surface of the scraper is made of a wear-resistant elastic non-metallic material, which is polyurethane or ultra-high molecular weight polyethylene.

[0010] Furthermore, the stirring arms are two or more and are evenly distributed along the circumference of the stirring shaft.

[0011] Furthermore, the axial height of the scraper is greater than the blade height of the agitator.

[0012] The organic fertilizer fermentation device provided by this utility model has the following beneficial effects: This invention combines an elastic wall-scraping structure with a dynamic aeration system to simultaneously achieve automatic scraping of deposits adhering to the tank wall and precise oxygen supply to the scraping area during the stirring process. This effectively solves the problems of scaling on the inner wall of traditional fermenters, local anaerobic conditions, and uneven heat transfer, thereby significantly improving fermentation uniformity and efficiency, greatly shortening the production cycle, and achieving self-cleaning without shutdown, thus achieving energy saving, consumption reduction, and improved organic fertilizer product quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the organic fertilizer fermentation device of this utility model.

[0014] Figure 2 This is a schematic diagram of the scraper plate of the organic fertilizer fermentation device of this utility model.

[0015] Figure 3 This is a top view schematic diagram of the stirring component of the organic fertilizer fermentation device of this utility model.

[0016] Figure 4 This is a schematic diagram of the air passage structure of the organic fertilizer fermentation device of this utility model.

[0017] In the diagram, 1 is the tank body; 2 is the drive motor; 3 is the stirring shaft; 4 is the stirring paddle; 5 is the stirring arm; 6 is the scraper; 7 is the hollow channel; 8 is the air duct; 9 is the air source; 10 is the aeration micropore; and 11 is the elastic mounting component. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. The described embodiments are merely some, not all, of these embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. Example

[0019] like Figure 1-4As shown, the present invention provides an organic fertilizer fermentation device, comprising a tank 1, a drive motor 2, a stirring shaft 3, and a stirring paddle 4. The tank 1 is made of 304 stainless steel, is cylindrical, with an inner diameter of 2.5m, a height of 2m, and an effective volume of 10m³, ensuring corrosion resistance and strength to meet fermentation requirements. In this embodiment, the stirring shaft 3 is equipped with three layers of stirring paddles 4 for mixing and spreading the main material. The stirring shaft 3 and the top of the tank 1 are mechanically sealed to prevent gas leakage. At least one stirring arm 5 is also fixedly installed on the stirring shaft 3. The radial extension length of the stirring arm 5 is greater than the rotation radius of the stirring paddle 4. A scraper plate 6 is installed at the end of the stirring arm 5. In this embodiment, there are two or more stirring arms 5, which are evenly distributed along the circumference of the stirring shaft 3, and the axial height of the scraper plate 6 is greater than the blade height of the stirring paddle 4.

[0020] The scraper plate 6 is connected to the end of the stirring arm 5 via an elastic mounting member 11, i.e., the scraper plate 6 is connected to the end of the stirring arm 5 via a leaf spring or compression spring; the surface shape of the scraper plate 6 is an arc-shaped surface that conforms to the contour of the inner wall of the tank 1, and the outer side of the scraper plate 6 contacts the inner wall of the tank 1 in the radial direction of the stirring shaft 3. Two radially extending stirring arms 5 are arranged between adjacent stirring paddles 4, with a spacing of 35cm between adjacent stirring paddles, and their length ensures that the end scraper plate 6 can reach the inner wall of the tank 1. The stirring arms 5 and the stirring shaft 3 are machined with communicating air passages 8.

[0021] The scraper plate 6 has a hollow channel 7 inside, which is connected to the air duct 8. An air source 9 is connected to the stirring shaft 3 via a rotary joint. The air source 9 is supplied by a Roots blower with a pressure of 0.3-0.5 MPa, providing a constant airflow of 15 m³ / h. The air source 9 is connected to the rotary joint via an air supply pipe. Multiple aeration micropores 10 communicating with the hollow channel 7 are formed on the working surface of the scraper plate 6. The working surface of the scraper plate 6 is made of a wear-resistant elastic non-metallic material, such as polyurethane or ultra-high molecular weight polyethylene. In this embodiment, aeration micropores 10 with a diameter of 2 mm are uniformly formed on the working surface of the scraper plate 6.

[0022] Working principle: The organic fertilizer fermentation raw materials are put into the tank 1, and the drive motor 2 is started to drive the stirring shaft 3, stirring paddle 4, stirring arm 5 and scraper 6 to rotate at a speed of 30 r / min. The stirring paddle 4 stirs the materials in the tank. The bottom stirring paddle 4 throws the bottom material upward, the middle stirring paddle 4 realizes the horizontal mixing of materials, and the upper stirring paddle 4 prevents the top material from forming a crust. At the same time, the scraper 6 is tightly attached to the tank wall under the elastic force of the sheet spring and scrapes off the material adhering to the tank wall as the stirring arm 5 rotates, avoiding the formation of hard scale. When the gas source 9 is activated, the gas enters the air passage 8 of the stirring shaft 3 through the rotary joint, then flows through the air passage 8 of the stirring arm 5 into the hollow channel 7 of the scraper plate 6, and finally sprays out from the aeration micro-holes 10. As the scraper plate 6 rotates with the stirring arm 5, the micro-holes dynamically spray air near the tank wall, which not only provides sufficient oxygen for the material, but also washes the tank wall to further reduce adhesion, while eliminating the low temperature zone on the tank wall. During the fermentation process, the aeration rate can be controlled by adjusting the pressure of the gas source 9, and the stirring and scraping efficiency can be adjusted by adjusting the speed of the drive motor 2 to ensure that the fermentation reaction proceeds stably. This embodiment effectively solves the problems of material sticking to the tank wall and uneven aeration in existing devices by integrating scraping and aeration functions, thereby improving the fermentation efficiency and quality of organic fertilizer. It also features a simple structure, convenient maintenance, and is suitable for large-scale organic fertilizer production.

[0023] The applicant conducted a comparative test on the anti-adhesion effect. Comparative Example 1: A traditional fermenter was used, equipped only with three sets of stirring paddles 4 and a static aeration disc at the bottom of the tank. Comparative Example 2: An improved fermenter was used, equipped with three sets of stirring paddles 4 and fixed rigid scraper plates 6 (without flexible installation or dynamic aeration function), and fitted with the same static aeration disc at the bottom of the tank as Comparative Example 1. Example: The device described in this utility model was used, with the structure as described in Example 1.

[0024] Using the same mixture of pig manure and straw (initial moisture content approximately 65%, carbon-to-nitrogen ratio approximately 25:1) as fermentation raw material, batch fermentation was carried out in three different sets of apparatuses: Control Example 1, Control Example 2, and Example 3, until the material was fully decomposed. The effective volume of each set of apparatus was 10 m³, and the feed rate was 8 m³; the stirring speed was 30 r / min, and the ambient temperature was controlled at 25-30℃.

[0025] Evaluation indicators: maximum thickness of inner wall adhesion (measured using a stainless steel ruler at three cross-sections of tank 1: top, middle, and bottom, with six measurement points around each cross-section, and the maximum value recorded), standard deviation of fermentation temperature (five temperature sensors are evenly arranged inside the tank, and the temperature is recorded three times a day to calculate the standard deviation), fermentation cycle (time from feeding to material decomposition), and discharge cleaning time.

[0026] The evaluation results are as follows: Control Example 1: Maximum thickness of internal wall adhesion 1.9cm, fermentation temperature uniformity (standard deviation ℃) 5.8℃, fermentation cycle 45 days, cleanliness of the can wall at discharge, requires high-pressure rinsing >30min; Control Example 2: Maximum thickness of internal wall adhesion 3.0cm, but the scale is hard, fermentation temperature uniformity (standard deviation ℃) 4.5℃, fermentation cycle 38 days, cleanliness of the can wall at discharge, requires soaking and high-pressure rinsing for 20-25min; Example: Maximum thickness of internal wall adhesion <0.5cm, no scale, only a small amount of loose adhesion, fermentation temperature uniformity (standard deviation ℃) 2.1℃, fermentation cycle 30 days, cleanliness of the can wall at discharge, no cleaning required.

[0027] This invention achieves continuous and flexible scraping through the elastically installed scraper 6, completely solving the problem of adhesion to the inner wall. The effect is far superior to traditional tanks that rely solely on stirring, and also superior to rigid scrapers that are prone to wear, jamming, and leaving hard deposits after cleaning. This invention significantly reduced the standard deviation from 5.8℃ in Control Example 1 to 2.1℃, demonstrating the elimination of localized low-temperature zones (especially in the tank wall area), resulting in a qualitative improvement in fermentation uniformity. This is mainly attributed to dynamic aeration solving the anaerobic problem in the tank wall area, and effective cleaning ensuring heat conduction. This invention shortens the fermentation cycle from 45 days to 30 days, proving that the synergistic effect of scraping and aeration represents a significant, albeit not obvious, technological advancement in accelerating microbial reactions and improving overall fermentation efficiency.

[0028] This invention achieves continuous flexible scraping through the elastically installed scraper 6, completely solving the problem of internal wall adhesion. Its effect is far superior to that of traditional tanks that rely solely on stirring, and it also overcomes the defects of rigid scrapers, such as easy wear, jamming, and the presence of hard scale after cleaning. On the other hand, dynamic aeration combined with efficient cleaning effectively eliminates anaerobic problems in the tank wall area and ensures heat conduction, significantly reducing the standard deviation of fermentation temperature from 5.8℃ in control example 1 to 2.1℃, thus significantly improving fermentation uniformity. The synergistic effect of the two further accelerates the microbial reaction, shortening the fermentation cycle from 45 days to 30 days, effectively solving the problems of scaling on the inner wall of traditional fermenters, local anaerobic conditions, and uneven heat transfer.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An organic fertilizer fermentation device, comprising a tank (1), a drive motor (2), a stirring shaft (3), and a stirring paddle (4), characterized in that: At least one stirring arm (5) is fixedly installed on the stirring shaft (3). The radial extension length of the stirring arm (5) is greater than the rotation radius of the stirring paddle (4). A scraper plate (6) is installed at the end of the stirring arm (5). The scraper plate (6) has an arc shape that matches the inner wall contour of the tank (1). The scraper plate (6) is in radial direction of the stirring shaft (3), and its outer side contacts the inner wall of the tank (1). A hollow channel (7) is provided inside the scraper plate (6). Both the stirring arm (5) and the stirring shaft (3) have air passages (8) that are connected to each other. The air passages (8) are connected to the hollow channel (7). An air source (9) is connected to the stirring shaft (3) through a rotary joint. Multiple aeration microholes (10) that are connected to the hollow channel (7) are opened on the working surface of the scraper plate (6).

2. The organic fertilizer fermentation device according to claim 1, characterized in that: The scraper (6) is connected to the end of the stirring arm (5) by an elastic mounting member (11).

3. The organic fertilizer fermentation device according to claim 2, characterized in that: The elastic mounting element (11) is a leaf spring or a compression spring.

4. The organic fertilizer fermentation device according to claim 1, characterized in that: The working surface of the scraper (6) is made of wear-resistant elastic non-metallic material, which is polyurethane or ultra-high molecular weight polyethylene.

5. The organic fertilizer fermentation device according to claim 1, characterized in that: The stirring arms (5) are two or more and are evenly distributed along the circumference of the stirring shaft (3).

6. The organic fertilizer fermentation device according to claim 1, characterized in that: The axial height of the scraper (6) is greater than the blade height of the agitator (4).

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