Liquid microbial agent fermentation equipment

By using a circulating hot water heating system with a ring-shaped and serpentine tube structure and a drive assembly linked to a stirring shaft, the problems of uneven heating and poor stirring effect in liquid microbial agent fermentation equipment have been solved. This has enabled uniform heating within the tank and automated management of raw materials, thereby improving production efficiency and quality stability.

CN224299217UActive Publication Date: 2026-05-29HEBEI JINGAN FERTILIZER TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HEBEI JINGAN FERTILIZER TECH CO LTD
Filing Date
2025-06-16
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing liquid microbial inoculant fermentation equipment suffers from uneven heating and localized overheating, which affects the activity of microorganisms and fermentation quality. Furthermore, the stirring effect is poor, making it difficult to achieve automated and precise control of raw materials.

Method used

The system employs a combination of annular and serpentine tube structures for circulating hot water heating, which, combined with a stirring shaft linked to the drive assembly, achieves uniform heating and mixing within the tank. The feeding assembly utilizes a multi-storage chamber design and servo motor control to enable automated and targeted addition of raw materials.

Benefits of technology

Uniform heating within the tank was achieved, which improved the activity and fermentation uniformity of the microbial agents, enhanced the automation and precision of raw material management, and improved production efficiency and quality stability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to fermentation tank technical field, the utility model provides a kind of liquid microbial inoculant fermentation equipment, including jar body, heating assembly, driving assembly and feed assembly, jar body bottom is equipped with discharge pipe, inside is equipped with stirring shaft, temperature sensor and PH sensor;Heating assembly includes annular pipe, serpentine pipe and water collecting shell being equipped in jar body top, by circulating hot water into to heat inside jar body;Driving assembly is through central gear linkage stirring shaft and heating assembly, realize synchronous rotation stirring;Feed assembly includes the liquid storage tank with multiple liquid storage chambers, by servo motor driven rotation and cooperate with the automatic addition of different liquid raw materials of liquid discharge mechanism, the utility model realizes the mild heating, efficient stirring and accurate feeding of microbial inoculant fermentation process, improves inoculant fermentation efficiency and quality stability.
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Description

Technical Field

[0001] This utility model relates to the field of fermentation tank technology, specifically to a liquid microbial inoculant fermentation device. Background Technology

[0002] In the production of liquid microbial inoculants, traditional fermentation equipment typically uses electric heating to heat the fermentation tank, along with an external agitator to mix the inoculant with the liquid raw materials. However, in practical use, existing fermentation equipment still has the following shortcomings: First, electric heating suffers from uneven heating or localized overheating, which may lead to excessively high temperatures in certain areas inside the tank, affecting the activity of microorganisms or even causing their death, thus impacting the fermentation quality and survival rate of the inoculant. Second, the agitator structure is relatively simple, resulting in unsatisfactory mixing and failing to achieve thorough mixing of the microbial inoculant and raw materials. Furthermore, the raw material feeding method generally relies on manual or single-pipeline delivery, making it difficult to achieve automated, grouped, and controlled feeding of raw materials, reducing production efficiency and hindering precise control of the amount of various raw materials added.

[0003] Therefore, there is an urgent need to provide a liquid microbial agent fermentation equipment that can achieve constant temperature control, automatic mixing, and automatic feeding, so as to improve the production efficiency and quality stability of microbial agents. Utility Model Content

[0004] To overcome the above-mentioned defects, this utility model provides a liquid microbial inoculant fermentation device, which solves the problem of uneven heating or local overheating in existing fermentation tanks using electric heating. This may lead to excessively high temperatures in certain areas inside the tank, thereby affecting the activity of microorganisms or even causing their death, thus affecting the fermentation quality and survival rate of the inoculant.

[0005] According to one aspect, at least one embodiment of the present invention provides a liquid microbial inoculant fermentation device, comprising:

[0006] The tank body has symmetrically fixed support legs on the bottom of the side wall, a discharge pipe with a valve is fixedly connected to the center of the bottom wall of the tank body, several stirring shafts are symmetrically rotatably installed between the inner walls of the tank body, and a temperature sensor and a pH sensor are installed inside the tank body.

[0007] A heating assembly is installed at the center of the tank, and a drive assembly for driving the heating assembly and the stirring shaft is installed on the top wall of the tank.

[0008] A feeding assembly is mounted above the drive assembly and is used to add liquid raw materials into the tank.

[0009] For example, in a liquid microbial agent fermentation device provided in at least one embodiment of this utility model, the heating component includes an annular tube, which is fixed on the top wall of the tank. A water inlet pipe is fixedly connected to the outer wall of the annular tube. An annular shell is rotatably installed on the bottom wall of the annular tube through a leak-proof bearing. The annular shell is connected to the inner cavity of the annular tube. A serpentine tube is symmetrically fixed on the bottom wall of the annular shell. The other end of the serpentine tube is fixedly connected to the same water collection shell. The water collection shell is rotatably installed at the center of the top wall of the tank. A connecting pipe is fixedly connected to the top wall of the water collection shell.

[0010] For example, in a liquid microbial agent fermentation device provided in at least one embodiment of this utility model, the driving component includes a protective shell, a central gear is installed in the center of the inner cavity of the protective shell, the central gear is fixed on the connecting pipe, a plurality of transmission gears are symmetrically meshed with the side wall of the central gear, the transmission gears are rotatably installed on the top wall of the inner cavity of the protective shell, the transmission gears are meshed with driven gears, the top end of the stirring shaft passes through the top wall of the tank through a bearing and is fixedly connected to the center position of the bottom wall of the corresponding driven gear, a drive motor is fixed to the top wall of the protective shell, and the power shaft at the bottom of the drive motor passes through the protective shell through a bearing and is fixedly connected to the axis of any one of the transmission gears.

[0011] For example, in a liquid microbial inoculant fermentation device provided in at least one embodiment of the present invention, the top end of the connecting pipe passes through the top wall of the protective shell via a bearing and is connected to a drain pipe via a rotary joint.

[0012] For example, in a liquid microbial agent fermentation device provided in at least one embodiment of this utility model, the feeding assembly includes a mounting shell, which is fixed to the top wall of the protective shell. A liquid storage tank is rotatably installed inside the mounting shell. The liquid storage tank is divided into multiple liquid storage chambers by partitions. A mounting frame is fixed between the top walls of the mounting shell. A servo motor is fixed to the top wall of the mounting frame. The power shaft at the bottom of the servo motor passes through the mounting frame through a bearing and is fixedly connected to the center position of the top wall of the liquid storage tank. A draining mechanism is fixed to the bottom wall of each liquid storage chamber. A discharge pipe that cooperates with the draining mechanism is fixed to the bottom wall of the mounting shell.

[0013] For example, in a liquid microbial agent fermentation device provided in at least one embodiment of the present invention, a feeding port is provided on the top wall of the storage tank corresponding to the storage chamber, and a threaded cap is screwed onto the top wall of the storage tank corresponding to the feeding port.

[0014] For example, in a liquid microbial agent fermentation device provided in at least one embodiment of this utility model, the liquid discharge mechanism includes a shell, the shell is fixed on the bottom wall of the liquid storage chamber, a sliding sleeve is slidably installed inside the shell, a spring is fixed between the top wall of the sliding sleeve and the top wall of the inner cavity of the shell, an intermediate column is fixed in the center of the top wall of the inner cavity of the sliding sleeve, a ball is rotatably installed on the bottom wall of the intermediate column, a first through hole is symmetrically opened at the bottom of the side wall of the shell, and a second through hole is opened on the side wall of the sliding sleeve to cooperate with the first through hole.

[0015] For example, in a liquid microbial agent fermentation device provided in at least one embodiment of the present invention, the feed pipe includes a pipe body, the pipe body is fixedly connected to the bottom wall of the mounting shell, the bottom end of the pipe body is fixedly connected to the top of the inner cavity of the tank, the top end of the pipe body is fixed with a hemispherical shell that cooperates with the ball bearing by a connecting rod, the hemispherical shell is provided with a drain hole, and a solenoid valve is installed on the pipe body.

[0016] The beneficial effects of the embodiments of this utility model are as follows:

[0017] In this invention, by setting up annular and serpentine pipe structures and circulating hot water for heat conduction, uniform heating of the tank interior can be achieved, avoiding the local overheating problem caused by traditional electric heating. This effectively ensures the activity and survival rate of the microbial agent. The heating components and stirring shaft are both driven by a drive component, achieving synchronous rotation of the heat source and stirring, effectively enhancing the mixing effect of liquid raw materials and improving the uniformity of agent fermentation. The feeding component has a liquid storage tank with multiple liquid storage chambers, and works with a servo motor and a discharge mechanism to control the feeding position and timing, achieving automatic point-to-point addition of different types of raw materials, improving the automation and accuracy of raw material management. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0019] Figure 1 This is a perspective view of the external structure of this utility model;

[0020] Figure 2 This is a three-dimensional view of the internal structure of this utility model;

[0021] Figure 3 This is a three-dimensional view of the heating component structure of this utility model;

[0022] Figure 4This is a three-dimensional view of the feeding assembly structure of this utility model;

[0023] Figure 5 This is a three-dimensional half-section view of the feeding assembly of this utility model;

[0024] Figure 6 This is a three-dimensional view of the liquid discharge mechanism and feed pipe structure of this utility model;

[0025] In the diagram: 1. Tank body; 2. Support leg; 3. Discharge pipe; 4. Heating assembly; 41. Annular pipe; 42. Water inlet pipe; 43. Annular shell; 44. Serpentine pipe; 45. Water collection shell; 46. Connecting pipe; 5. Stirring shaft; 6. Drive assembly; 61. Protective shell; 62. Central gear; 63. Transmission gear; 64. Driven gear; 65. Drive motor; 7. Rotary joint; 8. Drain pipe; 9. Feeding assembly; 91. Safety device. 92. Housing; 93. Storage tank; 94. Storage chamber; 95. Threaded cap; 96. Mounting bracket; 97. Servo motor; 98. Drainage mechanism; 997. Outer shell; 998. Sliding sleeve; 999. Spring; 990. Intermediate column; 991. Ball bearing; 992. Through hole No. 1; 993. Through hole No. 2; 90. Feed port; 10. Feed pipe; 101. Pipe body; 102. Connecting rod; 103. Hemispherical shell; 104. Drainage hole. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0027] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figures 1-2 As shown, it illustrates a liquid microbial inoculant fermentation device according to one embodiment of the present invention, comprising:

[0033] Tank 1 has symmetrically fixed support legs 2 on the bottom side wall of tank 1. A discharge pipe 3 with a valve is fixedly connected to the center of the bottom wall of tank 1. Several stirring shafts 5 are symmetrically rotated between the inner walls of tank 1. A temperature sensor and a pH sensor (not shown in the figure) are installed inside tank 1.

[0034] Heating component 4 is installed at the center of tank 1. A drive component 6 is installed on the top wall of tank 1 to drive heating component 4 and stirring shaft 5.

[0035] Feeding assembly 9 is installed above drive assembly 6 and is used to add liquid raw materials into tank 1.

[0036] In this embodiment, the driving component 6 drives the heating component 4 and the stirring shaft 5 to rotate, which can fully mix the microbial inoculant and the corresponding liquid raw materials cultivated in the tank 1, ensuring the normal growth of the microbial inoculant. Simultaneously, the heating component 4 heats the inside of the tank 1 by circulating hot water. Compared with traditional electric heating, this heating method can effectively avoid localized overheating that could kill the microorganisms. The feeding component 9 facilitates the classification and storage of liquid raw materials, and automatically adds the corresponding raw materials during its rotation. Temperature and pH sensors are used to detect the temperature and pH value inside the tank 1, ensuring timely adjustment of the microbial cultivation environment. Both temperature and pH sensors are commercially available, and the appropriate model can be selected according to actual needs.

[0037] like Figures 2-3 As shown, it illustrates the heating assembly 4 and the driving assembly 6 in another embodiment of the present invention. The heating assembly 4 includes an annular tube 41, which is fixed to the top wall of the tank 1. A water inlet pipe 42 is fixedly connected to the outer wall of the annular tube 41. An annular shell 43 is rotatably mounted on the bottom wall of the annular tube 41 through a leak-proof bearing. The annular shell 43 is connected to the inner cavity of the annular tube 41. A serpentine tube 44 is symmetrically fixed to the bottom wall of the annular shell 43. The other end of the serpentine tube 44 is fixedly connected to the same water collection shell 45. The water collection shell 45 is rotatably mounted at the center of the top wall of the tank 1. A connecting pipe 46 is fixedly connected to the top wall of the water collection shell 45.

[0038] The drive assembly 6 includes a protective shell 61. A central gear 62 is installed in the center of the inner cavity of the protective shell 61. The central gear 62 is fixed on the connecting pipe 46. Several transmission gears 63 are symmetrically meshed on the side wall of the central gear 62. The transmission gears 63 are rotatably mounted on the top wall of the inner cavity of the protective shell 61. The transmission gears 63 are meshed with driven gears 64. The top end of the stirring shaft 5 passes through the top wall of the tank 1 through a bearing and is fixedly connected to the center position of the bottom wall of the corresponding driven gear 64. A drive motor 65 is fixed on the top wall of the protective shell 61. The power shaft at the bottom of the drive motor 65 passes through the protective shell 61 through a bearing and is fixedly connected to the axis of any one of the transmission gears 63.

[0039] The top end of the connecting pipe 46 passes through the top wall of the protective shell 61 via a bearing and is connected to a drain pipe 8 via a rotary joint 7.

[0040] In this embodiment, the heating component 4 heats the inside of the tank 1 by circulating hot water. Simultaneously, it rotates under the action of the drive component 6, working in conjunction with the stirring shaft 5 to ensure thorough mixing of the microbial agent and the corresponding liquid raw materials. During use, hot water is continuously supplied to the inlet pipe 42. The water flows through the annular shell 43 into the serpentine tube 44, and then is collected through the water collection shell 45 and connecting pipe 46 into the drain pipe 8. The heat from the hot water is conducted to the tank 1 through the serpentine tube 44, thus regulating the temperature inside the tank 1. When mixing the microbial agent and the corresponding liquid raw materials, the drive motor 65 is switched on. The drive motor 65 drives the central gear 62 and the driven gear 64 to rotate via the transmission gear 63. The rotation of the central gear 62 drives the bottom serpentine tube 44 to rotate, stirring the liquid raw materials. Simultaneously, the rotation of the driven gear 64 drives the stirring shaft 5 to stir the liquid raw materials, ensuring thorough mixing of the microbial agent and the corresponding liquid raw materials.

[0041] like Figures 4-6 As shown, the feeding assembly 9 in another embodiment of the present invention is illustrated. The feeding assembly 9 includes a mounting shell 91, which is fixed to the top wall of the protective shell 61. A liquid storage tank 92 is rotatably mounted inside the mounting shell 91. The liquid storage tank 92 is divided into multiple liquid storage chambers 93 by a partition. A mounting frame 95 is fixed between the top walls of the mounting shell 91. A servo motor 96 is fixed to the top wall of the mounting frame 95. The power shaft at the bottom of the servo motor 96 passes through the mounting frame 95 through a bearing and is fixedly connected to the center position of the top wall of the liquid storage tank 92. A draining mechanism 97 is fixed to the bottom wall of each liquid storage chamber 93. A discharge pipe 10 that cooperates with the draining mechanism 97 is fixed to the bottom wall of the mounting shell 91.

[0042] A feeding port 98 is provided on the top wall of the liquid storage tank 92 at the position corresponding to the liquid storage chamber 93, and a threaded cover 94 is screwed onto the top wall of the liquid storage tank 92 at the position corresponding to the feeding port 98.

[0043] The drainage mechanism 97 includes a housing 971, which is fixed to the bottom wall of the storage chamber 93. A sliding sleeve 972 is slidably installed inside the housing 971. A spring 973 is fixed between the top wall of the sliding sleeve 972 and the top wall of the inner cavity of the housing 971. A central column 974 is fixed in the center of the top wall of the inner cavity of the sliding sleeve 972. A ball bearing 975 is rotatably installed on the bottom wall of the central column 974. A first through hole 976 is symmetrically opened at the bottom of the side wall of the housing 971. A second through hole 977 is opened on the side wall of the sliding sleeve 972 to cooperate with the first through hole 976.

[0044] The discharge pipe 10 includes a pipe body 101, which is fixedly connected to the bottom wall of the mounting shell 91. The bottom end of the pipe body 101 is fixedly connected to the top of the inner cavity of the tank 1. The top end of the pipe body 101 is fixed with a hemispherical shell 103 that cooperates with the ball 975 through a connecting rod 102. A drain hole 104 is provided on the hemispherical shell 103. A solenoid valve (not shown in the figure) is installed on the pipe body 101.

[0045] In this embodiment, the feeding component 9 can conveniently classify and store liquid raw materials, and can automatically add the corresponding raw materials during the rotation of the feeding component 9. When the feeding component 9 is in use, it first replenishes the liquid raw material into the corresponding liquid storage chamber 93 through the feeding port 8. When it is necessary to add the corresponding liquid raw material into the tank 1, the servo motor 96 drives the liquid storage tank 92 to rotate. During the rotation of the liquid storage tank 92, the ball bearing 975 will roll along the bottom wall of the outer shell 971. At this time, the second through hole 977 on the sliding sleeve 972 is offset from the first through hole 976. The first through hole 976 is in a closed state. At this time, the spring 973 is in a compressed state. When the corresponding discharge mechanism 97 moves to the position of the discharge pipe 10, the sliding sleeve 972 moves downward under the action of the spring 973. At this time, the ball bearing 975 will be stuck in the hemispherical shell 103. At this time, the second through hole 977 on the sliding sleeve 972 is aligned with the first through hole 976. The liquid raw material in the liquid storage chamber 93 enters the discharge pipe 10 through the second through hole 977 and the first through hole 976, and finally falls into the tank 1. As the liquid storage tank 92 continues to rotate, the ball bearing 975 pushes the intermediate column 974 upward under the action of the side wall of the hemispherical shell 103. During the upward movement of the intermediate column 974, it will drive the sliding sleeve 972 to move upward, causing the second through hole 977 and the first through hole 976 to be misaligned, and the first through hole 976 will be closed again.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A liquid microbial inoculant fermentation device, characterized in that, include: Tank (1), with supporting legs (2) symmetrically fixed at the bottom of the side wall of the tank (1), and a discharge pipe (3) with a valve fixedly connected to the center of the bottom wall of the tank (1), and several stirring shafts (5) symmetrically rotated between the inner walls of the tank (1), and a temperature sensor and a pH sensor are installed inside the tank (1). Heating component (4), the heating component (4) is installed at the center of the tank (1), and the top wall of the tank (1) is equipped with a driving component (6) for driving the heating component (4) and the stirring shaft (5). Feeding assembly (9) is installed above the drive assembly (6) and is used to add liquid raw materials into the tank (1).

2. The liquid microbial inoculant fermentation equipment according to claim 1, characterized in that, The heating assembly (4) includes an annular tube (41), which is fixed on the top wall of the tank (1). The outer wall of the annular tube (41) is fixedly connected to a water inlet pipe (42). The bottom wall of the annular tube (41) is rotatably mounted with an annular shell (43) through a leak-proof bearing. The annular shell (43) is connected to the inner cavity of the annular tube (41). The bottom wall of the annular shell (43) is symmetrically fixed with a serpentine tube (44). The other end of the serpentine tube (44) is fixedly connected to the same water collection shell (45). The water collection shell (45) is rotatably mounted at the center of the top wall of the tank (1). The top wall of the water collection shell (45) is fixedly connected to a connecting pipe (46).

3. The liquid microbial inoculant fermentation equipment according to claim 2, characterized in that, The drive assembly (6) includes a protective shell (61). A central gear (62) is installed in the center of the inner cavity of the protective shell (61). The central gear (62) is fixed on the connecting pipe (46). Several transmission gears (63) are symmetrically meshed on the side wall of the central gear (62). The transmission gears (63) are rotatably mounted on the top wall of the inner cavity of the protective shell (61). The transmission gears (63) are meshed with driven gears (64). The top end of the stirring shaft (5) passes through the top wall of the tank (1) through a bearing and is fixedly connected to the center position of the bottom wall of the corresponding driven gear (64). A drive motor (65) is fixed on the top wall of the protective shell (61). The power shaft at the bottom of the drive motor (65) passes through the protective shell (61) through a bearing and is fixedly connected to the axis of any one of the transmission gears (63).

4. The liquid microbial inoculant fermentation equipment according to claim 3, characterized in that, The top end of the connecting pipe (46) passes through the top wall of the protective shell (61) via a bearing and is connected to a drain pipe (8) via a rotary joint (7).

5. The liquid microbial inoculant fermentation equipment according to claim 3, characterized in that, The feeding assembly (9) includes a mounting shell (91), which is fixed on the top wall of the protective shell (61). A liquid storage tank (92) is rotatably installed inside the mounting shell (91). The liquid storage tank (92) is divided into multiple liquid storage chambers (93) by a partition. A mounting frame (95) is fixed between the top walls of the mounting shell (91). A servo motor (96) is fixed on the top wall of the mounting frame (95). The power shaft at the bottom of the servo motor (96) passes through the mounting frame (95) through a bearing and is fixedly connected to the center position of the top wall of the liquid storage tank (92). A draining mechanism (97) is fixed on the bottom wall of each liquid storage chamber (93). A discharge pipe (10) that cooperates with the draining mechanism (97) is fixed on the bottom wall of the mounting shell (91).

6. The liquid microbial inoculant fermentation equipment according to claim 5, characterized in that, The top wall of the liquid storage tank (92) is provided with a feeding port (98) corresponding to the position of the liquid storage chamber (93), and a threaded cap (94) is screwed onto the top wall of the liquid storage tank (92) corresponding to the position of the feeding port (98).

7. The liquid microbial inoculant fermentation equipment according to claim 5, characterized in that, The draining mechanism (97) includes a housing (971), which is fixed to the bottom wall of the liquid storage chamber (93). A sliding sleeve (972) is slidably installed inside the housing (971). A spring (973) is fixed between the top wall of the sliding sleeve (972) and the top wall of the inner cavity of the housing (971). A central column (974) is fixed in the center of the top wall of the inner cavity of the sliding sleeve (972). A ball bearing (975) is rotatably installed on the bottom wall of the central column (974). A first through hole (976) is symmetrically opened at the bottom of the side wall of the housing (971). A second through hole (977) is opened on the side wall of the sliding sleeve (972) to cooperate with the first through hole (976).

8. The liquid microbial inoculant fermentation equipment according to claim 7, characterized in that, The feeding pipe (10) includes a pipe body (101), which is fixedly connected to the bottom wall of the mounting shell (91). The bottom end of the pipe body (101) is fixedly connected to the top of the inner cavity of the tank (1). The top end of the pipe body (101) is fixed with a hemispherical shell (103) that cooperates with the ball (975) through a connecting rod (102). A drain hole (104) is provided on the hemispherical shell (103). A solenoid valve is installed on the pipe body (101).