A plant straw biogas fermentation system

Abstract

The present invention relates to the technical field of straw fermentation equipment, and specifically relates to a plant straw biogas fermentation system, which includes a fermentation tank. On the upper left end of the outer surface of the fermentation tank, an input cylinder is connected and installed. A crushing cylinder is installed through the upper surface of the input cylinder. The upper end of the crushing cylinder is open. A rotating shaft is rotatably installed at the axial center position inside the crushing cylinder. A first motor is fixedly installed at the rear end of the rotating shaft. A number of groups of cutting knives are fixedly installed at equal intervals on the outer surface of the rotating shaft. Each group of cutting knives has three pieces and is arranged in a ring shape. A pressing mechanism is arranged on the upper surface of the fermentation tank, and a loosening mechanism is arranged on the lower surface of the fermentation tank. By setting the loosening mechanism, the present invention can fully mix the composted straw raw materials and the fermentation agent, improve the fermentation efficiency, and by arranging the loosening mechanism at the lower end of the fermentation tank, the obstruction of the loosening mechanism to the operation of the pressing mechanism is eliminated, so that the pressing mechanism can press the straw raw materials.

Description

Technical Field

[0001] The present invention relates to the technical field of straw fermentation equipment, and particularly to a plant straw biogas fermentation system. Background Art

[0002] Plant biogas fermentation mainly uses crop straws such as wheat straws, corns, peanuts, and soybeans as raw materials for biogas fermentation, and biogas is produced by adding straw fermentation inoculants. The commonly used fermentation raw materials in rural areas are mainly divided into three types: full-straw biogas fermentation, mixed biogas fermentation of straw and human and animal manure, and full use of human and animal manure as biogas fermentation raw materials. When using full straw for biogas fermentation, since straw is composed of compounds such as lignin and cellulose, the decomposition speed is slow and the gas production cycle is long. Therefore, it is necessary to perform crushing pretreatment and composting on the straw raw materials to improve the gas production effect.

[0003] The Chinese patent discloses an efficient biogas digester, with the patent application number CN201810920018.1. An efficient biogas digester includes a fermentation tank body, a first feed pipeline, a second feed pipeline, a stirring shaft, a driving motor, a swinging rod, a first spring, a sliding block, and an electromagnet. Two groups of swinging rods are symmetrically arranged in the rectangular through groove of the stirring shaft; the middle of the swinging rod is hinged on the stirring shaft, and a set of crushing knives is arranged on the cylindrical surface at one end of the swinging rod.

[0004] Although the above device can crush the straw raw materials, and the swinging rod can swing up and down while rotating around the stirring shaft to fully mix the manure and straw in the fermentation tank body, so that the manure and straw ferment evenly. However, when the straw raw materials are composted, it is necessary to compact the straw to exhaust the air in the straw, so that anaerobic microorganisms can reproduce and decompose the organic matter in the straw raw materials. The above device directly mixes the crushed raw materials with manure, and the manual compaction efficiency is low. Moreover, since the stirring shaft is arranged in the middle position of the fermentation tank, it is not convenient for the compaction process.

[0005] Therefore, a plant straw biogas fermentation system is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a plant straw biogas fermentation system to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: a plant straw biogas fermentation system, including a fermentation tank. The upper left end of the outer surface of the fermentation tank is connected and installed with an input cylinder. The upper surface of the input cylinder is penetrated and installed with a crushing cylinder. The upper end of the crushing cylinder is open. A rotating shaft is rotatably installed at the axial center position inside the crushing cylinder. A first motor is fixedly installed at the rear end of the rotating shaft. A number of groups of cutting knives are fixedly installed at equal intervals on the outer surface of the rotating shaft. Each group of cutting knives has three pieces and is arranged in a ring shape. A pressing mechanism is arranged on the upper surface of the fermentation tank. A loosening mechanism is arranged on the lower surface of the fermentation tank. A feeding port is fixedly installed on the right side of the outer surface of the fermentation tank;

[0008] The pressing mechanism includes a transmission belt, a first crankshaft, a lifting plate and a pressing plate. The lifting plate is arranged inside the fermentation tank. The upper end of the lifting plate penetrates the upper surface of the fermentation tank. The lower surface of the lifting plate is fixedly connected to the oil pressing plate. The first crankshaft is arranged at the middle position of the upper surface of the fermentation tank. The front and rear ends of the first crankshaft are symmetrically rotatably connected to support plates. The lower surfaces of the support plates are fixedly connected to the fermentation tank. The upper surface of the lifting plate is rotatably connected to the first crankshaft. The transmission belt is movably installed on the outer surfaces of the first crankshaft and the rotating shaft;

[0009] The loosening mechanism includes a second motor, a second crankshaft, a connecting plate, a vertical plate and a conical block. There are a number of vertical plates. The upper ends of the number of vertical plates penetrate the lower surface of the fermentation tank and are fixedly connected to the conical block. An auxiliary mechanism for improving the loosening efficiency is arranged on the lower inner surface of the fermentation tank. The lower ends of the number of vertical plates are all fixedly connected to the connecting plate. The middle position of the lower surface of the connecting plate is rotatably connected to the second crankshaft. The two ends of the second crankshaft penetrate the two sides of the lower end of the fermentation tank. The left end of the second crankshaft is fixedly connected to the second motor.

[0010] During operation, since straw is composed of compounds such as lignin and cellulose, with a slow decomposition rate and a long gas production cycle, it is necessary to perform crushing pretreatment and composting on the straw raw materials to improve the gas production effect. When composting the straw, it is necessary to compact the straw to expel the air inside the straw, enabling anaerobic microorganisms to multiply and decompose the organic matter in the straw raw materials. Compared with the patent where the stirring shaft is set in the middle of the equipment, it is not convenient to compact the straw raw materials and can only be compacted manually, but the manual compaction efficiency is low. In the present invention, by setting a compaction mechanism and a loosening mechanism, first, add straw raw materials and a fermentation agent into the crushing cylinder, connect the first motor to an external power source, drive the first motor to rotate, and the rotating shaft and the cutting knives on the outer surface of the rotating shaft will thus rotate, enabling the straw raw materials in the crushing cylinder to be cut. The cut straw raw materials enter the fermentation tank through the input cylinder. Since the outer surfaces of the rotating shaft and the first crankshaft are sleeved with a transmission belt, the transmission belt will thus rotate along with the rotating shaft. Since the first crankshaft can convert its own rotational motion into the linear reciprocating motion of the lifting plate, the pressing plate installed on the lower surface of the lifting plate will perform reciprocating up and down motions, thereby being able to continuously pat the straw raw materials gathered in the fermentation tank, and the straw raw materials are compacted, facilitating the reproduction of anaerobic microorganisms. After the straw is compacted and composted for two to three days, add a fermentation agent into the fermentation tank through the feeding port, connect the second motor to an external power source, drive the second motor to rotate, and thus be able to drive the second crankshaft to rotate. Since the first crankshaft can convert its own rotational motion into the linear reciprocating motion of the connecting plate, the vertical plate fixedly installed on the upper surface of the connecting plate can thus move up and down, and the conical block fixedly installed on the upper surface of the vertical plate can thus move up and down to loosen the straw raw materials in the fermentation tank. Through the continuous up and down movement of the conical block, the straw raw materials and the fermentation agent can be fully mixed, improving the fermentation efficiency of the straw. In the present invention, by setting a compaction mechanism, the straw raw materials can be patted and compacted, avoiding manual compaction, improving the compaction efficiency, and ensuring the progress of the composting process. In addition, by setting the loosening mechanism at the bottom of the fermentation tank, the obstruction of the loosening mechanism to the operation of the compaction mechanism is eliminated, and the composted straw raw materials and the fermentation agent can be fully mixed, improving the fermentation efficiency.

[0011] Preferably, the auxiliary mechanism includes a rotating plate, a fixed block, and a cylinder. The fixed block is arranged between two adjacent conical blocks, and the lower surface of the fixed block is fixedly connected to the fermentation tank. The upper surface of the fixed block is fixedly connected to the cylinder. The rotating plates are symmetrically and rotatably installed on both sides of the outer surface of the cylinder, and the side of the rotating plate away from the cylinder is in contact with the conical block.

[0012] During operation, since the vertical plate can only move up and down and cannot significantly agitate the straw raw materials, some of the straw raw materials cannot be mixed with the fermenting agent. By providing an auxiliary mechanism, when the vertical plate moves upward, the conical block fixedly installed on the vertical plate also moves upward, thereby driving the rotating plate above the conical block to rotate upward around the cylinder. When the vertical plate moves downward, the rotating plate rotates downward around the cylinder under the action of its own gravity and the pressure of the straw raw materials. Since the vertical plate moves up and down reciprocally, the rotating plate rotates up and down reciprocally around the cylinder, thus being able to further agitate the straw raw materials, enabling the straw raw materials to be fully mixed with the fermenting agent, increasing contact, and improving the fermentation rate.

[0013] Preferably, magnets are fixedly embedded on one side of the upper surfaces of the two rotating plates close to the fixed block, and the two magnets have the same magnetic property.

[0014] During operation, when the rotating plate rotates downward around the cylinder under the action of its own gravity and the pressure of the straw raw materials, the speed is relatively slow, reducing the mixing efficiency of the rotating plate for the straw. By providing two magnets with the same magnetic property, when the two rotating plates rotate to the vertical state, the two magnets embedded on the two rotating plates approach each other. Since the two magnets have the same magnetic property, according to the principle of like poles repelling each other, the two magnets repel each other, thereby generating a thrust force on the rotating plate and accelerating the rotation of the rotating plate, improving the mixing efficiency of the rotating plate for the straw.

[0015] Preferably, a round rod is fixedly connected to the front side of the outer surface of the fixed block. Two telescopic rods are symmetrically and rotatably connected to both sides of the outer surface of the round rod. The upper ends of the two telescopic rods are rotatably connected to a scraping plate. Sliders are symmetrically and fixedly installed on both sides of the lower surface of the scraping plate. Slide grooves are symmetrically formed on both sides of the upper surface of the rotating plate, and the sliders are matched with the slide grooves.

[0016] During operation, since straw raw materials adhere to the surface of the magnets, affecting the interaction between the two magnets, by providing the cooperation of the scraping plate and the telescopic rods, when the rotating plate rotates, the telescopic rods rotate around the round rod under the action of a thrust force, and the telescopic rods push the scraping plate to move along the slide grooves, so that the scraping plate can clean the straw raw materials on the surface of the magnets, preventing the straw raw materials from interfering with the magnets.

[0017] Preferably, an inclined plate is provided on the lower surface inside the input cylinder, and a vibration mechanism is provided on the lower surface of the inclined plate. Guide blocks are symmetrically and fixedly connected to both sides of the lower surface inside the fermentation tank, and the upper surfaces of the guide blocks are inclined. The upper surface of the lower end of the pressing plate is inclined.

[0018] During operation, by setting the inclined plate, the straw raw materials can be conveyed to the middle position inside the fermentation tank, facilitating the pressing mechanism to press the straw raw materials. By setting the pressing plate and the guiding block to be inclined, the straw raw materials falling on the pressing plate and the guiding block can slide along the inclined surface, and the sliding straw raw materials gather at the middle position inside the fermentation tank.

[0019] Preferably, the vibration mechanism includes an elastic flap and a spring. The upper surface of the elastic flap is fixedly connected to the inclined plate, and the side of the elastic flap away from the input cylinder is longer than the inclined plate. A plurality of springs are provided, and the upper end of the spring is fixedly connected to the elastic flap, and the lower end of the spring is fixedly connected to the input cylinder;

[0020] During operation, when conveying the straw raw materials, the straw raw materials may be blocked in the input cylinder. When the pressing plate moves up and down, it touches the elastic flap, and the elastic flap thus generates fluctuations. Since a plurality of springs are installed on the lower surface of the elastic flap, when the elastic flap fluctuates, the springs move up and down accordingly, which can drive the inclined plate to vibrate, causing the straw raw materials on the inclined plate to be unstable and slide from the upper surface of the inclined plate into the fermentation tank, preventing the straw raw materials from being blocked in the input cylinder.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By setting the pressing mechanism, the present invention can pat and press the straw raw materials, exhaust the voids in the straw gaps, and anaerobic microorganisms can reproduce and decompose the straw, which is beneficial to the subsequent fermentation of the straw.

[0023] 2. By setting the loosening mechanism, the present invention can fully mix the straw raw materials after composting and the fermentation agent, improve the fermentation efficiency, and by setting the loosening mechanism at the lower end of the fermentation tank, the obstruction of the loosening mechanism to the operation of the pressing mechanism is eliminated, enabling the pressing mechanism to press the straw raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural view of the whole of the present invention;

[0025] Figure 2 is a cross-sectional view of the whole of the present invention;

[0026] Figure 3 is a structural view of the pressing mechanism of the present invention;

[0027] Figure 4 is a structural view of the loosening mechanism of the present invention;

[0028] Figure 5 is a structural view of the auxiliary mechanism of the present invention;

[0029] Figure 6Structural views of the magnet, scraper, round rod, and telescopic rod of the present invention;

[0030] Figure 7 Structural view of the vibration mechanism of the present invention.

[0031] In the figure: 1, fermentation tank; 2, crushing cylinder; 3, first motor; 4, input cylinder; 5, cutting knife; 6, rotating shaft; 7, pressing mechanism; 71, transmission belt; 72, first crankshaft; 73, lifting plate; 74, pressing plate; 8, loosening mechanism; 81, second motor; 82, second crankshaft; 83, connecting plate; 84, vertical plate; 85, conical block; 9, auxiliary mechanism; 91, rotating plate; 92, fixed block; 93, cylinder; 10, magnet; 11, scraper; 12, round rod; 13, telescopic rod; 14, chute; 15, inclined plate; 16, guide block; 17, vibration mechanism; 171, elastic flap; 172, spring. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Please refer to Figures 1 to 7 , the present invention provides a technical solution:

[0036] A plant straw biogas fermentation system, as Figures 1 to 4 shown, includes a fermentation tank 1. An input cylinder 4 is communicatively installed at the upper left end of the outer surface of the fermentation tank 1. A crushing cylinder 2 is installed through the upper surface of the input cylinder 4. The upper end of the crushing cylinder 2 is open. A rotating shaft 6 is rotatably installed at the axial center position inside the crushing cylinder 2. A first motor 3 is fixedly installed at the rear end of the rotating shaft 6. A number of groups of cutting knives 5 are equidistantly and fixedly installed on the outer surface of the rotating shaft 6. Each group of the cutting knives 5 has three pieces and is arranged in a ring shape. A pressing mechanism 7 is arranged on the upper surface of the fermentation tank 1. A loosening mechanism 8 is arranged on the lower surface of the fermentation tank 1. A feeding port is fixedly installed on the right side of the outer surface of the fermentation tank 1.

[0037] The pressing mechanism 7 includes a transmission belt 71, a first crankshaft 72, a lifting plate 73 and a pressing plate 74. The lifting plate 73 is arranged inside the fermentation tank 1. The upper end of the lifting plate 73 penetrates through the upper surface of the fermentation tank 1. The lower surface of the lifting plate 73 is fixedly connected to the pressing plate 74. The first crankshaft 72 is arranged at the middle position of the upper surface of the fermentation tank 1. The front and rear ends of the first crankshaft 72 are symmetrically and rotatably connected to support plates. The lower surfaces of the support plates are fixedly connected to the fermentation tank 1. The upper surface of the lifting plate 73 is rotatably connected to the first crankshaft 72. The transmission belt 71 is movably installed on the outer surfaces of the first crankshaft 72 and the rotating shaft 6.

[0038] The loosening mechanism 8 includes a second motor 81, a second crankshaft 82, a connecting plate 83, a vertical plate 84 and a tapered block 85. A plurality of the vertical plates 84 are provided, and the upper ends of the plurality of vertical plates 84 all penetrate through the lower surface of the fermentation tank 1 and are fixedly connected to the tapered block 85. An auxiliary mechanism 9 for improving the loosening efficiency is arranged on the inner lower surface of the fermentation tank 1. The lower ends of the plurality of vertical plates 84 are all fixedly connected to the connecting plate 83. The middle position of the lower surface of the connecting plate 83 is rotatably connected to the second crankshaft 82. Both ends of the second crankshaft 82 penetrate through both sides of the lower end of the fermentation tank 1, and the left end of the second crankshaft 82 is fixedly connected to the second motor 81.

[0039] During operation, since straw is composed of compounds such as lignin and cellulose, its decomposition rate is slow and the gas production cycle is long. Therefore, it is necessary to perform crushing pretreatment and composting on the straw raw material to improve the gas production effect. When composting the straw, it is necessary to compact the straw to expel the air inside the straw, enabling anaerobic microorganisms to multiply and decompose the organic matter in the straw raw material. In contrast, in the patent, the stirring shaft is set in the middle of the equipment, which is not convenient for compacting the straw raw material and can only be compacted manually. However, manual compaction has low efficiency. In the present invention, by setting a compaction mechanism 7 and a loosening mechanism 8, first, add the straw raw material and fermenting agent into the crushing cylinder 2, connect the first motor 3 to an external power source, and drive the first motor 3 to rotate, so that the rotating shaft 6 and the cutting knives 5 on the outer surface of the rotating shaft 6 rotate, thereby being able to cut the straw raw material in the crushing cylinder 2. The cut straw raw material enters the fermentation tank 1 through the input cylinder 4. Since the outer surfaces of the rotating shaft 6 and the first crankshaft 72 are sleeved with a transmission belt 71, the transmission belt 71 follows the rotating shaft 6 to rotate. Since the first crankshaft 72 can convert its own rotational motion into the linear reciprocating motion of the lifting plate 73, the pressing plate 74 installed on the lower surface of the lifting plate 73 reciprocates up and down, thereby being able to continuously pat the straw raw material gathered in the fermentation tank 1, and the straw raw material is compacted, facilitating the reproduction of anaerobic microorganisms. After the straw is compacted and composted for two to three days, add the fermenting agent into the fermentation tank 1 through the feeding port, connect the second motor 81 to an external power source, and drive the second motor 81 to rotate, thereby being able to drive the second crankshaft 82 to rotate. Since the first crankshaft 72 can convert its own rotational motion into the linear reciprocating motion of the connecting plate 83, the vertical plate 84 fixedly installed on the upper surface of the connecting plate 83 can move up and down, and the conical block 85 fixedly installed on the upper surface of the vertical plate 84 can move up and down to loosen the straw raw material in the fermentation tank 1. Through the continuous up and down movement of the conical block 85, the straw raw material and the fermenting agent can be fully mixed, improving the fermentation efficiency of the straw. In the present invention, by setting the compaction mechanism 7, the straw raw material can be patted and compacted, avoiding manual compaction, improving the compaction efficiency, and ensuring the progress of the composting process. In addition, by setting the loosening mechanism 8 at the bottom of the fermentation tank 1, the obstruction of the loosening mechanism 8 to the operation of the compaction mechanism 7 is eliminated, and the composted straw raw material and the fermenting agent can be fully mixed, improving the fermentation efficiency.

[0040] As an implementation manner of the present invention, as Figure 5 shown, the auxiliary mechanism 9 includes a rotating plate 91, a fixed block 92 and a cylinder 93. The fixed block 92 is arranged between two adjacent conical blocks 85, and the lower surface of the fixed block 92 is fixedly connected to the fermentation tank 1. The upper surface of the fixed block 92 is fixedly connected to the cylinder 93. The rotating plates 91 are symmetrically and rotatably installed on both sides of the outer surface of the cylinder 93, and the side of the rotating plate 91 away from the cylinder 93 is in contact with the conical block 85.

[0041] During operation, since the vertical plate 84 can only move up and down, it cannot stir the straw raw material significantly, resulting in some straw raw materials being unable to be mixed with the fermentation agent. By setting up an auxiliary mechanism 9, when the vertical plate 84 moves up, the conical block 85 fixedly installed on the vertical plate 84 moves up accordingly, thereby driving the rotating plate 91 above the conical block 85 to rotate upward around the cylinder 93. When the vertical plate 84 moves down, the rotating plate 91 rotates downward around the cylinder 93 due to its own gravity and the pressure of the straw raw material. Since the vertical plate 84 makes an up and down reciprocating motion, the rotating plate 91 rotates up and down around the cylinder 93 accordingly, thereby being able to further stir the straw raw material, so that the straw raw material and the fermentation agent are fully mixed, the contact is increased, and the fermentation rate is improved.

[0042] As an embodiment of the present invention, Figure 6 As shown, magnets 10 are fixedly embedded on one side of the upper surface of the two rotating plates 91 close to the fixed block 92, and the two magnets 10 have the same magnetic properties.

[0043] During operation, the rotating plate 91 is subjected to its own gravity and the pressure of the straw raw material and rotates downward around the cylinder 93 at a slow speed, thereby reducing the mixing efficiency of the rotating plate 91 on the straw. By providing two magnets 10 with the same magnetic properties, when the two rotating plates 91 rotate to a vertical state, the two magnets 10 embedded on the two rotating plates 91 approach each other. Since the two magnets 10 have the same magnetic properties, according to the principle of like repels like, the two magnets 10 repel each other, thereby generating a thrust on the rotating plate 91, accelerating the rotation of the rotating plate 91, and improving the mixing efficiency of the rotating plate 91 on the straw.

[0044] As an embodiment of the present invention, Figure 6 As shown, a round rod 12 is fixedly connected to the front side of the outer surface of the fixed block 92, and two telescopic rods 13 are symmetrically rotatably connected to the outer surface of the round rod 12 on both sides, and the upper ends of the two telescopic rods 13 are rotatably connected to the scraper 11, and sliders are symmetrically fixedly installed on both sides of the lower surface of the scraper 11, and sliding grooves 14 are symmetrically opened on both sides of the upper surface of the rotating plate 91, and the sliders are matched with the sliding grooves 14.

[0045] During operation, since the straw material adheres to the surface of the magnet 10, the interaction between the two magnets 10 is affected. By setting the scraper 11 and the telescopic rod 13 to cooperate with each other, when the rotating plate 91 rotates, the telescopic rod 13 is subjected to the thrust and rotates around the round rod 12, and the telescopic rod 13 pushes the scraper 11 to move along the slide groove 14, so that the scraper 11 can clean the straw material on the surface of the magnet 10 to prevent the straw material from interfering with the magnet 10.

[0046] As an embodiment of the present invention, Figure 2As shown, an inclined plate 15 is provided on the inner lower surface of the input cylinder 4, and a vibration mechanism 17 is provided on the lower surface of the inclined plate 15. On both sides of the inner lower surface of the fermentation tank 1, guide blocks 16 are symmetrically and fixedly connected, and the upper surface of the guide block 16 is inclined. The lower upper surface of the pressing plate 74 is inclined.

[0047] During operation, by providing the inclined plate 15, the straw raw materials can be conveyed to the middle position inside the fermentation tank 1, so as to facilitate the pressing mechanism 7 to press the straw raw materials. By setting the pressing plate 74 and the guide block 16 to be inclined, the straw raw materials falling on the pressing plate 74 and the guide block 16 can slide along the inclined surface, and the sliding straw raw materials gather at the middle position inside the fermentation tank 1.

[0048] As an implementation manner of the present invention, as Figure 7 shown, the vibration mechanism 17 includes an elastic flap 171 and a spring 172. The upper surface of the elastic flap 171 is fixedly connected to the inclined plate 15, and the side of the elastic flap 171 away from the input cylinder 4 is longer than the inclined plate 15. A plurality of springs 172 are provided, and the upper end of the spring 172 is fixedly connected to the elastic flap 171, and the lower end of the spring 172 is fixedly connected to the input cylinder 4;

[0049] During operation, when conveying the straw raw materials, the straw raw materials may be blocked in the input cylinder 4. When the pressing plate 74 moves up and down, it touches the elastic flap 171, and the elastic flap 171 thus generates fluctuations. Since a plurality of springs 172 are installed on the lower surface of the elastic flap 171, when the elastic flap 171 fluctuates, the springs 172 move up and down accordingly, so as to drive the inclined plate 15 to vibrate, causing the straw raw materials on the inclined plate 15 to be unstable and capable of sliding from the upper surface of the inclined plate 15 into the fermentation tank 1, preventing the straw raw materials from being blocked in the input cylinder 4.

[0050] Working principle: Since straw is composed of compounds such as lignin and cellulose, its decomposition rate is slow and the gas production cycle is long. Therefore, it is necessary to perform crushing pretreatment and composting on the straw raw materials to improve the gas production effect. When composting the straw, it is necessary to compact the straw to expel the air inside the straw, so that anaerobic microorganisms can multiply and decompose the organic matter in the straw raw materials. Compared with the patent where the stirring shaft is set in the middle of the equipment, it is not convenient to compact the straw raw materials and can only be compacted manually, but the manual compaction efficiency is low. In this invention, by setting a compaction mechanism 7 and a loosening mechanism 8, first, add straw raw materials and fermentation agents into the crushing cylinder 2, connect the first motor 3 to an external power source, drive the first motor 3 to rotate, and the rotating shaft 6 and the cutting knives 5 on the outer surface of the rotating shaft 6 will thus rotate, so as to cut the straw raw materials in the crushing cylinder 2. The cut straw raw materials enter the fermentation tank 1 through the input cylinder 4. Since the transmission belt 71 is sleeved on the outer surfaces of the rotating shaft 6 and the first crankshaft 72, the transmission belt 71 will thus rotate following the rotating shaft 6. Since the first crankshaft 72 can convert its own rotational motion into the linear reciprocating motion of the lifting plate 73, the pressing plate 74 installed on the lower surface of the lifting plate 73 will perform up and down reciprocating motions, so as to continuously pat the straw raw materials gathered in the fermentation tank 1, and the straw raw materials are compacted, which is convenient for the reproduction of anaerobic microorganisms. After the straw is compacted and composted for two to three days, add fermentation agents into the fermentation tank 1 through the feeding port, connect the second motor 81 to an external power source, drive the second motor 81 to rotate, and thus drive the second crankshaft 82 to rotate. Since the first crankshaft 72 can convert its own rotational motion into the linear reciprocating motion of the connecting plate 83, the vertical plate 84 fixedly installed on the upper surface of the connecting plate 83 can thus move up and down, and the conical block 85 fixedly installed on the upper surface of the vertical plate 84 can thus move up and down to loosen the straw raw materials in the fermentation tank 1. Through the continuous up and down movement of the conical block 85, the straw raw materials and the fermentation agents can be fully mixed, improving the fermentation efficiency of the straw. In this invention, by setting the compaction mechanism 7, the straw raw materials can be patted and compacted, avoiding manual compaction, improving the compaction efficiency, and ensuring the progress of the composting process. In addition, by setting the loosening mechanism 8 at the bottom of the fermentation tank 1, the obstruction of the loosening mechanism 8 to the work of the compaction mechanism 7 is eliminated, and the composted straw raw materials and the fermentation agents can be fully mixed, improving the fermentation efficiency.

[0051] All the electrical components appearing in this article are electrically connected to the external main controller and the 220V mains through a transformer, and the main controller can be a conventional known device such as a computer for control. The product models provided by the present invention are only used according to the structural characteristics of the product for this technical solution. The products will be adjusted and modified after purchase to make them more matching and conforming to the technical solution to which the present invention belongs. It is an optimal application technical solution for this technical solution. The product models can be replaced and modified according to the required technical parameters, which is well-known to those skilled in the art. Therefore, those skilled in the art can clearly obtain the corresponding usage effects through the technical solution provided by the present invention.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plant straw biogas fermentation system, comprising a fermentation tank (1), characterized in that: On the upper left end of the outer surface of the fermentation tank (1), an input cylinder (4) is connected and installed. On the upper surface of the input cylinder (4), a crushing cylinder (2) is installed through. The upper end of the crushing cylinder (2) is open. At the axial center position inside the crushing cylinder (2), a rotating shaft (6) is rotatably installed. At the rear end of the rotating shaft (6), a first motor (3) is fixedly installed. On the outer surface of the rotating shaft (6), a number of groups of cutting knives (5) are fixedly installed at equal intervals. And each group of the cutting knives (5) is provided with three pieces and is arranged in a ring shape. On the upper surface of the fermentation tank (1), a pressing mechanism (7) is provided. On the lower surface of the fermentation tank (1), a loosening mechanism (8) is provided. On the right side of the outer surface of the fermentation tank (1), a feeding port is fixedly installed; The pressing mechanism (7) includes a transmission belt (71), a first crankshaft (72), a lifting plate (73) and a pressing plate (74). The lifting plate (73) is arranged inside the fermentation tank (1). The upper end of the lifting plate (73) penetrates through the upper surface of the fermentation tank (1). On the lower surface of the lifting plate (73), a pressing plate (74) is fixedly connected. The first crankshaft (72) is arranged at the middle position on the upper surface of the fermentation tank (1). And at the front and rear ends of the first crankshaft (72), support plates are symmetrically rotatably connected. The lower surfaces of the support plates are fixedly connected to the fermentation tank (1). The upper surface of the lifting plate (73) is rotatably connected to the first crankshaft (72). The transmission belt (71) is movably installed on the outer surfaces of the first crankshaft (72) and the rotating shaft (6); The loosening mechanism (8) includes a second motor (81), a second crankshaft (82), a connecting plate (83), a vertical plate (84) and a conical block (85). A number of vertical plates (84) are provided. And the upper ends of the number of vertical plates (84) all penetrate through the lower surface of the fermentation tank (1) and are fixedly connected with conical blocks (85). Inside the lower surface of the fermentation tank (1), an auxiliary mechanism (9) for improving the loosening efficiency is provided. The lower ends of the number of vertical plates (84) are all fixedly connected to the connecting plate (83). At the middle position on the lower surface of the connecting plate (83), it is rotatably connected to the second crankshaft (82). The two ends of the second crankshaft (82) penetrate through the two sides at the lower end of the fermentation tank (1). And the left end of the second crankshaft (82) is fixedly connected to the second motor (81); The auxiliary mechanism (9) includes a rotating plate (91), a fixed block (92) and a cylinder (93). The fixed block (92) is arranged between two adjacent conical blocks (85). And the lower surface of the fixed block (92) is fixedly connected to the fermentation tank (1). The upper surface of the fixed block (92) is fixedly connected to the cylinder (93). The rotating plates (91) are symmetrically rotatably installed on both sides of the outer surface of the cylinder (93). And the side of the rotating plate (91) away from the cylinder (93) is in contact with the conical block (85).

2. The plant straw biogas fermentation system according to claim 1, characterized in that: On one side of the upper surfaces of the two rotating plates (91) close to the fixed block (92), magnets (10) are fixedly embedded, and the two magnets (10) have the same magnetic property.

3. A plant straw biogas fermentation system according to claim 2, characterized in that: A round rod (12) is fixedly connected to the front side of the outer surface of the fixed block (92). Two telescopic rods (13) are symmetrically and rotatably connected to both sides of the outer surface of the round rod (12). The upper ends of the two telescopic rods (13) are rotatably connected to a scraper (11). Sliders are symmetrically and fixedly installed on both sides of the lower surface of the scraper (11). Slide grooves (14) are symmetrically formed on both sides of the upper surface of the rotating plate (91), and the sliders are matched with the slide grooves (14).

4. A plant straw biogas fermentation system according to claim 1, characterized in that: An inclined plate (15) is arranged on the lower surface inside the input cylinder (4), and a vibration mechanism (17) is arranged on the lower surface of the inclined plate (15). Guide blocks (16) are symmetrically and fixedly connected to both sides of the lower surface inside the fermentation tank (1), and the upper surfaces of the guide blocks (16) are inclined. The lower end upper surface of the pressing plate (74) is inclined.

5. A plant straw biogas fermentation system according to claim 4, characterized in that: The vibration mechanism (17) includes an elastic flap (171) and a spring (172). The upper surface of the elastic flap (171) is fixedly connected to the inclined plate (15), and the side of the elastic flap (171) away from the input cylinder (4) is longer than the inclined plate (15). A plurality of springs (172) are provided, the upper ends of the springs (172) are fixedly connected to the elastic flap (171), and the lower ends of the springs (172) are fixedly connected to the input cylinder (4).

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