Hu sheep feed straw ammonification fermentation device

Abstract

The invention relates to the technical field of Hu sheep breeding, in particular to a Hu sheep feed straw ammonification fermentation device which comprises a lifting mechanism, a smashing mechanism, a fermentation tank, a tubular spiral conveyor, a solution supply mechanism and a vacuumizing mechanism. Urea deposited at the bottom of the fermentation tank is lifted and then dumped from the position above the straw, so that the deposited Yiasaa solution flows from the top of the straw to the bottom of the straw again, meanwhile, the urea solution is diffused in the horizontal direction of the straw in cooperation with rotary stirring of the stirring paddle, and then it is guaranteed that the urea solution is overall distributed in a balanced mode; the straw ammoniation effect is better, the taste of the straw feed is better, and the straw feed does not have toxicity.

Description

Technical Field

[0001] The invention relates to the technical field of Hu sheep breeding, and in particular to a Hu sheep feed straw ammoniation fermentation device. Background Art

[0002] First, the straw feed for sheep can be improved by urea ammoniation treatment to improve the palatability of the straw. The texture of the treated straw becomes softer and the smell is improved, so sheep are more willing to eat it, thereby increasing the amount of feed they eat.

[0003] Secondly, this treatment can improve the nutritional value of straw. The ammonia treatment will break some of the bonds between cellulose and lignin in the straw, making the cellulose easier to be decomposed and utilized by microorganisms in the sheep's rumen, increasing the digestible nutrients. At the same time, the ammonia treatment can also add nitrogen to the straw. The nitrogen in urea will combine with the straw during the ammonia treatment process, increasing the crude protein content of the straw, making up for the low protein content of the straw itself.

[0004] During the ammoniation process, the amount of urea used is 3%-5% of the dry matter weight of the straw. If the amount is too little, the ammoniation effect is not obvious; if the amount is too much, there may be too much urea residue in the straw, which may cause ammonia poisoning to the sheep after eating. At the same time, the ammoniation process requires good sealing conditions, which can be sealed with plastic bags, pits, pools, etc. For example, when using plastic bags for ammoniation, make sure that the plastic bags are not damaged and tie the bag tightly; when using pits or pools for ammoniation, the top must be sealed to prevent ammonia leakage, because ammonia leakage will cause ammonia failure.

[0005] However, maintaining good sealing conditions will inevitably lead to the concentration of urea solution at the bottom of the closed space during the straw ammoniation process, resulting in uneven urea distribution, causing large differences in the straw ammoniation effect, and unsatisfactory straw ammoniation effect. What's worse, it will cause ammonia poisoning to sheep after eating, which is not worth the loss.

[0006] A Chinese patent with patent application number CN201911060564.3 discloses a straw ammoniation device that first soaks the straw in a urea solution and then puts it into a pool for squeezing, thereby allowing the straw to fully contact with urea and improving the quality of ammoniation.

[0007] However, in the above technical solution, after soaking the straw, the straw is squeezed to fully contact with urea for ammonia, which still leads to accumulation of urea solution at the straw at the bottom of the pool, resulting in an unbalanced situation. Summary of the invention

[0008] In view of the above problems, the present invention provides a device for ammoniation and fermentation of Hu sheep feed straw. By improving the fermentation tank, a solution lifting mechanism is set inside the fermentation tank to lift the urea deposited at the bottom of the fermentation tank and then pour it from above the straw, so that the deposited urea solution flows from the top of the straw to the bottom of the straw again. At the same time, the rotating stirring of the stirring paddle makes the urea solution diffuse in the horizontal direction of the straw, thereby ensuring the overall balanced distribution of the urea solution, so that the straw ammoniation effect is better, the taste of the straw feed is better, and there is no toxicity.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A device for ammoniation and fermentation of Hu sheep feed straw, comprising:

[0011] Lifting mechanism, crushing mechanism, fermentation tank, tubular screw conveyor, solution supply mechanism and vacuum mechanism;

[0012] The lifting mechanism is arranged at an angle, the output end of the lifting mechanism is located above the feed opening of the crushing mechanism, and the lifting mechanism transports the straw pile at an angle;

[0013] An open receiving hopper is provided on the top of the pulverizing mechanism, and the receiving hopper receives the straw pile transported by the lifting mechanism for pulverizing;

[0014] The fermentation tank is located on one side of the pulverizing mechanism, the feed port of the fermentation tank is connected to the discharge port of the pulverizing mechanism through the tubular screw conveyor, and the vacuum pumping mechanism is provided on the fermentation tank;

[0015] The solution supply mechanism is arranged at one side of the fermentation tank, is connected with the liquid inlet of the fermentation tank through a pipeline, and inputs urea solution into the fermentation tank in proportion.

[0016] As an improvement, the lifting mechanism is a rotary belt elevator, and a plurality of hoppers are equidistantly arranged on the rotary belt of the lifting mechanism, and the hoppers carry the straw pile for transportation.

[0017] As an improvement, the pulverizing mechanism further comprises a group of pulverizing rollers and a driving device arranged in parallel, wherein the pulverizing rollers are driven by the driving device through a gear set to rotate in the opposite direction, thereby engaging and pulverizing the straw pile in the receiving hopper.

[0018] As an improvement, a stirring paddle is provided in the fermentation tank, and the stirring paddle is driven by a stirring motor on the top of the fermentation tank to rotate and stir.

[0019] As an improvement, a solution lifting mechanism is provided in the fermentation tank, and the solution lifting mechanism is driven by the rotation of the stirring paddle to lift the urea solution at the bottom of the fermentation tank to the top of the fermentation tank for dispersion.

[0020] As an improvement, the solution lifting mechanism includes a solution concentration cylinder, a piston and a transmission connection assembly;

[0021] The solution concentration cylinder is installed in the fermentation tank, the solution concentration cylinder is coaxially arranged with the stirring paddle, and the bottom of the solution concentration cylinder is conical, the bottom of the solution concentration cylinder is mesh-shaped, the middle and lower parts of the solution concentration cylinder are connected through a connecting branch pipe, and a one-way valve is arranged in the connecting branch pipe, and the top of the solution concentration cylinder is mesh-shaped;

[0022] The piston is slidably disposed in the solution concentration cylinder, the piston is transmission-connected to the stirring paddle through the transmission connection assembly, and the piston is driven to slide up and down by the rotation of the stirring paddle;

[0023] The transmission connection assembly includes a rotating shaft, a connecting rod, a bevel gear set, a central rotating shaft and a transmission gear set. The rotating shaft is rotatably installed at the top opening of the solution concentration cylinder. The two ends of the connecting rod are respectively hinged to the piston and the rotating shaft. The rotating shaft and the central rotating shaft are connected by a bevel gear set, and the central rotating shaft and the stirring paddle are connected by the transmission gear set.

[0024] As an improvement, the tubular screw conveyor is connected to the discharge port in an upwardly inclined manner, and the tubular screw conveyor is connected to the feed port in an downwardly inclined manner.

[0025] As an improvement, the solution supply mechanism includes a stirring tank and a flow meter;

[0026] The stirring tank stores a urea solution, and the stirring tank is connected to the fermentation tank through a pipeline, and a delivery pump is arranged on the pipeline;

[0027] The flow meter is installed on the pipeline, and the flow meter monitors and measures the urea solution transported in the pipeline.

[0028] As an improvement, the mass ratio of the urea solution in the stirring tank is urea: water = 1:10-1:11, and the mass ratio of the urea solution and the straw fragments controlled by the flow meter is urea solution: straw fragments = 50:100-55:100.

[0029] As an improvement, the vacuum pumping mechanism includes a vacuum pumping pipeline and a vacuum pump;

[0030] The vacuum pipe is connected to the top of the fermentation tank, the vacuum pump is installed on the vacuum pipe, and the vacuum pump separates the air and ammonia in the fermentation tank through the vacuum pipe.

[0031] The beneficial effects of the present invention are:

[0032] The present invention improves the fermentation tank, and sets a solution lifting mechanism inside the fermentation tank to lift the urea solution deposited at the bottom of the fermentation tank, and then pours it from above the straw, so that the deposited urea solution flows from the top of the straw to the bottom of the straw again, and at the same time, the rotating stirring of the stirring paddle makes the urea solution diffuse in the horizontal direction of the straw, thereby ensuring the overall balanced distribution of the urea solution, so that the straw ammoniation effect is better, the taste of the straw feed is better, and there is no toxicity;

[0033] The present invention provides a vacuum pumping mechanism on the fermentation tank, and uses the vacuum pumping mechanism to perform vacuum treatment on the inside of the fermentation tank, thereby preventing oxygen from reacting with ammonia when the straw is fermented inside the fermentation tank, avoiding the loss of ammonia, and ensuring the ammoniaization effect of the straw. In addition, after the straw is ammoniated, the vacuum pumping mechanism can quickly extract the ammonia inside the fermentation tank for centralized treatment, avoiding the emission of ammonia causing harm to the staff;

[0034] The present invention drives the piston to move up and down in the solution concentration cylinder through the rotation and stirring of the stirring paddle, so that the piston can extract the urea solution in the solution concentration cylinder, thereby realizing the circulation of the urea solution, and the piston continuously slides up and down in the solution concentration cylinder, and can also form suction on the straw at the bottom, so that the urea solution deposited in the straw is concentrated in the solution concentration cylinder, so that excessive urea solution is avoided from remaining in the straw, and the ammoniaization effect of the straw is guaranteed.

[0035] In summary, the present invention has the advantages of good straw ammoniaization quality, good taste of the fermented straw feed, and guaranteed safety and nutritional value of the straw feed, and is particularly suitable for the technical field of Hu sheep straw feed processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0037] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0038] Figure 3 It is a side view structural schematic diagram of the present invention;

[0039] Figure 4 It is a schematic diagram of the three-dimensional structure of the crushing mechanism of the present invention;

[0040] Figure 5 This is a schematic diagram of the three-dimensional structure of the fermentation tank of the present invention;

[0041] Figure 6 This is a schematic diagram of the internal structure of the fermentation tank of the present invention;

[0042] Figure 7 It is a schematic cross-sectional structure diagram of the solution lifting mechanism of the present invention;

[0043] Figure 8 It is a schematic diagram of the three-dimensional structure of the solution lifting mechanism of the present invention;

[0044] Fig. 9 It is a schematic diagram of the three-dimensional structure of the transmission connection assembly of the present invention;

[0045] Fig.10 for Fig. 9 Enlarged structural diagram at A in the middle. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] Example:

[0050] like Figures 1 to 10 As shown, a device for ammoniation and fermentation of Hu sheep feed straw includes:

[0051] Lifting mechanism 1, crushing mechanism 2, fermentation tank 3, tubular screw conveyor 4, solution supply mechanism 5 and vacuum mechanism 6;

[0052] The lifting mechanism 1 is arranged at an angle, and the output end of the lifting mechanism 1 is located above the feeding opening of the crushing mechanism 2, and the lifting mechanism 1 is inclined to transport the straw pile;

[0053] An open receiving hopper 20 is provided on the top of the crushing mechanism 2, and the receiving hopper 20 receives the straw pile transported by the lifting mechanism 1 for crushing;

[0054] The fermentation tank 3 is located on one side of the pulverizing mechanism 2, and the feed port 31 of the fermentation tank 3 is connected to the discharge port 21 of the pulverizing mechanism 2 through the tubular screw conveyor 4. The bottom of the fermentation tank 3 is provided with a discharge port 30 for outputting the fermented straw feed, and the discharge port 30 is provided with an electric valve for controlling the switch. The tubular screw conveyor 4 is connected to the discharge port 21 in an upward manner, and the tubular screw conveyor 4 is connected to the feed port 31 in an downward manner. The tubular screw conveyor 4 transports the straw pulverized by the pulverizing mechanism 2 into the fermentation tank 3, and the straw is mixed with the urea solution in the fermentation tank. The fermentation tank 3 is provided with the vacuum pumping mechanism 6, which performs a vacuum treatment on the fermentation tank 3 to eliminate air and ammonia gas from reacting.

[0055] Specifically, the vacuum mechanism 6 includes a vacuum pipe 61 and a vacuum pump 62; the vacuum pipe 61 is connected to the top of the fermentation tank 3, and the vacuum pump 62 is installed on the vacuum pipe 61. The vacuum pump 62 vacuums the air and ammonia in the fermentation tank 3 through the vacuum pipe 61;

[0056] It should be noted again that the ammoniation process mainly uses ammonia to react chemically with cellulose, hemicellulose and other components in the straw. For example, ammonia can break the ester bond between lignin and cellulose in the straw, thereby improving the digestibility of the straw. If air enters, oxygen will react with ammonia, resulting in ammonia loss. Ammonia and oxygen will undergo an oxidation reaction under certain conditions to produce nitrogen and water, as shown in the chemical equation:

[0057] 4NH3+3O2=2N2+6H20, which will reduce the effective amount of ammonia participating in the straw ammoniation reaction, thus affecting the ammoniation effect;

[0058] The solution supply mechanism 5 is arranged on one side of the fermentation tank 3. The solution supply mechanism 5 is connected to the liquid inlet 32 ​​of the fermentation tank 3 through a pipeline, and the solution supply mechanism 5 inputs urea solution into the fermentation tank 3 in proportion. The solution supply mechanism 5 and the tubular screw conveyor 4 work synchronously, so that the crushed straw and the urea solution are mixed in the fermentation tank 3.

[0059] In addition, the straw in the present invention can be one or more of corn straw, wheat straw, and rice straw, and the moisture content of the straw is controlled at 30%-40%. If the straw is too dry, the ammonia solution is difficult to be evenly distributed in the straw, which will affect the ammonia effect; and if the moisture content is too high, it is easy to cause the straw to mold, and it will also increase the risk of ammonia loss.

[0060] like Figure 2 As shown, the lifting mechanism 1 is a rotary belt elevator, and a plurality of hoppers 12 are equidistantly arranged on the rotary belt 11 of the lifting mechanism 1. The hoppers 12 carry straw piles for transportation, and the straw piles are bundles of straw packaged into square or round shapes.

[0061] like Figure 4 As shown, further, the crushing mechanism 2 also includes a set of crushing rollers 22 and a driving device 23 arranged in parallel, and the crushing rollers 22 are driven by the driving device 23 through a gear set to rotate in the opposite direction, and the straw pile in the receiving hopper 20 is crushed by the crushing mechanism 2, so that the straw is cut into small segments with a length of 2-3 cm, and the surface area of ​​the chopped straw is increased, which is conducive to the full contact between the ammonia solution and the straw, so that the ammonia reaction is more uniform and faster. If the straw is too long, the ammonia solution is difficult to penetrate into the interior of the straw, resulting in incomplete ammonia; and if the straw is too short, it is easy to cause the loss of nutrients during the operation and increase the processing cost.

[0062] In addition, a stirring paddle 33 is provided in the fermentation tank 3, and the stirring paddle 33 is driven by a stirring motor 34 on the top of the fermentation tank 3 to rotate and stir, so that the straw can be evenly and completely mixed with the urea solution inside the fermentation tank.

[0063] Specifically, and creatively, the fermenter 3 of the present invention is provided with a solution lifting mechanism 7, which is rotationally driven by the stirring paddle 33 to lift the urea solution at the bottom of the fermenter 3 to the top of the fermenter 3 for dispersion.

[0064] like Figure 5-10 As shown, further, the solution lifting mechanism 7 includes a solution concentration cylinder 71, a piston 72 and a transmission connection assembly 73;

[0065] The solution concentration cylinder 71 is installed in the fermentation tank 3, the solution concentration cylinder 71 is coaxially arranged with the stirring paddle 33, and the bottom of the solution concentration cylinder 71 is conical, the bottom of the solution concentration cylinder 71 is mesh-shaped, the middle and lower parts of the solution concentration cylinder 71 are connected through a connecting branch pipe 711, and a one-way valve 712 is arranged in the connecting branch pipe 711, and the top of the solution concentration cylinder 71 is mesh-shaped;

[0066] The piston 72 is slidably disposed in the solution concentration cylinder 71, and the piston 72 is transmission-connected to the stirring paddle 33 through the transmission connection assembly 73, and the piston 72 is driven to slide up and down by the rotation of the stirring paddle 33;

[0067] The transmission connection assembly 73 includes a rotating shaft 731, a connecting rod 732, a bevel gear set 733, a central shaft 734 and a transmission gear set 735. The rotating shaft 731 is rotatably installed at the top opening of the solution concentration cylinder 71. The two ends of the connecting rod 732 are respectively hinged to the piston 72 and the rotating shaft 731. The rotating shaft 731 and the central shaft 734 are transmission-connected via the bevel gear set 733. The central shaft 734 and the stirring paddle 33 are transmission-connected via the transmission gear set 735.

[0068] It should be noted that the urea solution in the fermentation tank enters the solution concentration cylinder 71 through the mesh provided at the bottom of the solution concentration cylinder 71, and since the solution concentration cylinder 71 is deeply buried in the straw, when the stirring paddle 33 rotates, the stirring paddle 33 drives the piston 72 to slide up and down in the solution concentration cylinder 71, and the urea solution at the bottom of the straw is continuously sucked into the solution concentration cylinder 71 through the suction action of the piston 72 in the solution concentration cylinder 71, and the urea solution is discharged through the mesh at the top of the solution concentration cylinder 71, and in the process of dispersing the urea solution, the CO2 and a small amount of hydrogen sulfide gas generated in the ammoniation process will also be carried and released to the top of the fermentation tank, so that these gases will not be buried in the straw, thereby reducing the damage of CO2 to the acid-base balance environment inside the straw.

[0069] It is further explained that, during the up and down sliding process of the piston 72, when the piston 72 slides down, the urea solution below the piston 72 moves to the top of the piston 72 through the connecting branch pipe 711, and a one-way valve 712 is provided on the connecting branch pipe 711. The one-way valve 712 only allows the urea solution to enter the top of the piston 72 from the connecting branch pipe 711, while the urea solution above the piston 72 cannot enter from the connecting branch pipe 711 to the bottom of the piston 72. Therefore, as the piston 72 continues to move, the urea solution is continuously concentrated above the piston 72.

[0070] It is further explained that in the initial stage of ammoniaization, the stirring paddle 33 and the solution lifting mechanism 7 work for a period of time and then stop working. After the ammoniaization is carried out for a period of time, the stirring paddle 33 and the solution lifting mechanism 7 are started again. Such an intermittent working mode allows the straw to obtain sufficient ammoniaization treatment time. Specifically, when the ambient temperature is 20-30°C, the ammoniaization reaction proceeds relatively smoothly and it takes about 1-3 weeks to complete the ammoniaization. Therefore, after the straw is left to ferment for 2-3 days, the stirring paddle 33 and the solution lifting mechanism 7 can be started once, and then the straw is allowed to ferment again for 2-3 days, and this cycle is repeated to achieve sufficient and uniform ammoniaization of the straw with ammonia in the fermentation tank.

[0071] like Figure 2 As shown, as a preferred embodiment, the solution supply mechanism 5 includes a stirring tank 51 and a flow meter 52;

[0072] The stirring tank 51 stores urea solution, and the stirring tank 51 is connected to the fermentation tank 3 through a pipeline, and a delivery pump is provided on the pipeline;

[0073] The flow meter 52 is installed on the pipeline, and the flow meter 52 monitors and measures the urea solution transported in the pipeline.

[0074] Specifically, the mass ratio of the urea solution in the stirring tank 51 is urea: water = 1:10-1:11, and the mass ratio of the urea solution and the straw fragments controlled by the flow meter 52 is urea solution: straw fragments = 50:100-55:100.

[0075] It should be noted that after solid urea is added to the stirring tank 51, liquid water is added to the stirring tank 51 so that the urea is dissolved in the liquid water to form a urea solution. When the stirring tank 51 pumps the urea solution into the fermentation tank 3, the flow meter 52 accurately controls and proportions the amount of urea solution used.

[0076] Specifically, for every 100 kg of corn stalks, 3-5 kg ​​of urea can be used, and the urea can be dissolved in 40-50 kg of water, that is, the ratio of straw, urea, and water is about 100:3-5:40-50. For air-dried straw, the required weight of urea is weighed according to the ratio of 5 kg of urea for every 100 kg of air-dried straw, and then dissolved in water equivalent to 60% of the total weight of the straw, that is, the ratio is about 100:5:60. For crushed corn stalks, it is more appropriate to add 4-6 kg of urea for every 100 kg of crushed corn stalks, and use 20-30 kg of water for every kilogram of urea. At this time, the ratio of the three is about 100:4-6:80-180.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for ammoniation and fermentation of Hu sheep feed straw, characterized in that: include: A lifting mechanism (1), a crushing mechanism (2), a fermentation tank (3), a tubular screw conveyor (4), a solution supply mechanism (5) and a vacuum pumping mechanism (6); The lifting mechanism (1) is arranged at an angle, the output end of the lifting mechanism (1) is located above the feed opening of the crushing mechanism (2), and the lifting mechanism (1) conveys the straw pile at an angle; An open material receiving hopper (20) is provided on the top of the pulverizing mechanism (2), and the material receiving hopper (20) receives the straw pile transported by the lifting mechanism (1) for pulverizing; The fermentation tank (3) is located on one side of the pulverizing mechanism (2), the feed port (31) of the fermentation tank (3) is connected to the discharge port (21) of the pulverizing mechanism (2) via the tubular screw conveyor (4), and the vacuum pumping mechanism (6) is provided on the fermentation tank (3); The solution supply mechanism (5) is arranged on one side of the fermentation tank (3), the solution supply mechanism (5) is connected to the liquid inlet (32) of the fermentation tank (3) through a pipeline, and the solution supply mechanism (5) inputs urea solution into the fermentation tank (3) in proportion.

2. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 1, characterized in that: The lifting mechanism (1) is a rotary belt type lifting machine. A plurality of hoppers (12) are equidistantly arranged on the rotary belt (11) of the lifting mechanism (1). The hoppers (12) carry the straw pile for transportation.

3. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 1, characterized in that: The pulverizing mechanism (2) further comprises a group of pulverizing rollers (22) and a driving device (23) arranged in parallel, wherein the pulverizing rollers (22) are driven by the driving device (23) to rotate in the opposite direction via a gear set, thereby engaging and pulverizing the straw pile in the receiving hopper (20).

4. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 1, characterized in that: A stirring paddle (33) is arranged in the fermentation tank (3), and the stirring paddle (33) is driven by a stirring motor (34) on the top of the fermentation tank (3) to rotate and stir.

5. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 4, characterized in that: The fermentation tank (3) is provided with a solution lifting mechanism (7), which is driven by the stirring paddle (33) to rotate and lift the urea solution at the bottom of the fermentation tank (3) to the top of the fermentation tank (3) for dispersion.

6. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 5, characterized in that: The solution lifting mechanism (7) comprises a solution concentration cylinder (71), a piston (72) and a transmission connection assembly (73); The solution concentration cylinder (71) is installed in the fermentation tank (3), the solution concentration cylinder (71) is coaxially arranged with the stirring paddle (33), and the bottom of the solution concentration cylinder (71) is arranged in a conical shape. The bottom of the solution concentration cylinder (71) is arranged in a mesh shape. The middle part and the lower part of the solution concentration cylinder (71) are connected through a connecting branch pipe (711), and a one-way valve (712) is arranged in the connecting branch pipe (711). The top of the solution concentration cylinder (71) is arranged in a mesh shape. The piston (72) is slidably disposed in the solution concentration cylinder (71), the piston (72) is transmission-connected to the stirring paddle (33) via the transmission connection assembly (73), and the piston (72) is driven to slide up and down by the rotation of the stirring paddle (33); The transmission connection assembly (73) comprises a rotating shaft (731), a connecting rod (732), a bevel gear set (733), a central rotating shaft (734) and a transmission gear set (735); the rotating shaft (731) is rotatably mounted at the top opening of the solution concentration cylinder (71); the two ends of the connecting rod (732) are respectively hinged to the piston (72) and the rotating shaft (731); the rotating shaft (731) and the central rotating shaft (734) are transmission-connected via the bevel gear set (733); the central rotating shaft (734) and the stirring paddle (33) are transmission-connected via the transmission gear set (735).

7. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 1, characterized in that: The tubular screw conveyor (4) is connected to the discharge port (21) in an inclined upward manner, and the tubular screw conveyor (4) is connected to the feed port (31) in an inclined downward manner.

8. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 1, characterized in that: The solution supply mechanism (5) comprises a stirring tank (51) and a flow meter (52); The stirring tank (51) stores a urea solution, and the stirring tank (51) is connected to the fermentation tank (3) through a pipeline, and a delivery pump is provided on the pipeline; The flow meter (52) is installed on the pipeline, and the flow meter (52) monitors and measures the urea solution transported in the pipeline.

9. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 8, characterized in that: The mass ratio of the urea solution in the stirring tank (51) is urea: water = 1:10-1:11, and the mass ratio of the urea solution and the straw fragments controlled by the flow meter (52) is urea solution: straw fragments = 50:100-55:

100.

10. The device for ammoniation and fermentation of Hu sheep feed straw according to claim 1, characterized in that: The vacuum pumping mechanism (6) comprises a vacuum pumping pipeline (61) and a vacuum pump (62); The vacuum pipe (61) is connected to the top of the fermentation tank (3), and the vacuum pump (62) is installed on the vacuum pipe (61). The vacuum pump (62) separates the air and ammonia in the fermentation tank (3) through the vacuum pipe (61).

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