CN115261218A

CN115261218A - Solid-state fermentation device for compound microbial agent

Info

Publication number: CN115261218A
Application number: CN202211178994.7A
Authority: CN
Inventors: 王静; 任庆良; 周长青; 侯建宾
Original assignee: Shandong Ferbeaut Fertilizer Co ltd
Current assignee: Shandong Ferbeaut Fertilizer Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2022-11-01
Anticipated expiration: 2042-09-27
Also published as: CN115261218B

Abstract

The invention discloses a solid-state fermentation device for a compound microbial agent, which relates to the technical field of solid-state fermentation and comprises a storage tank, a supporting mechanism and a fermentation tank, wherein the storage tank is used for storing the compound microbial agent; the stirring mechanism is used for mixing and stirring the composite microbial agent in the storage tank, and is arranged in the storage tank; the driving mechanism is used for driving the stirring mechanism to rotate at a constant speed and is arranged at the top of the material storage tank; according to the invention, through the arrangement of the stirring mechanism, the compound microbial agent in the inner cavity of the heat-insulating tank can be fully and uniformly mixed and stirred, so that a stirring blind area is avoided, and the fermentation effect is better; through actuating mechanism's setting, the direction of rotation that can drive first stirring piece and second stirring piece is opposite, increases axial flow power, and then makes more even of compound microbial inoculant stirring to help improving compound microbial inoculant's fermentation effect.

Description

Solid-state fermentation device for compound microbial agent

Technical Field

The invention relates to the technical field of solid state fermentation, in particular to a solid state fermentation device for a compound microbial inoculant.

Background

Solid state fermentation is the fermentation of microorganisms on a solid substrate with no or substantially no free water, wherein three phases of gas, liquid and solid coexist, i.e. the porous solid substrate contains water and water-insoluble substances. The sea contains extremely abundant organisms, and the number of marine microorganisms is about 0.1-2 hundred million. The marine microorganism has the characteristic of strong physiological activity which is not possessed by terrestrial bacteria, and the microorganism has the advantages of fermentability, infinite regeneration, no need of excessive exploitation of wild resources and the like.

When fermenting compound microbial inoculant, need put into the fermentation cylinder with the material, utilize agitating unit to stir and mix, make the material constantly turn in the fermentation cylinder, avoid the material to pile up and influence fermentation efficiency.

The prior patent document with publication number CN215667962U discloses a composite microbial inoculum solid state fermentation device, which is equipped with a heating system inside the fermentation device, and is also provided with a corresponding heat insulation mode if an external cooling system and an internal heating system are alternately heated, and foam heat insulation layers are arranged in a heating plate and on the inner wall of a tank body during heating, and the device can be freely moved and fixed in position through a wheel brake, so that the requirements of some special work are met, the usability of the device is increased, and the device is simple and easy to operate.

Although the fermentation efficiency of the solid-state fermentation device of the compound microbial inoculant is improved by the heating system, the stirring system adopts a single stirring shaft for stirring, the stirring effect is poor, the fermented materials are difficult to be fully mixed, the stirring blades are difficult to be mixed and stirred to the compound microbial inoculant close to the inner wall of the tank body, and the stirring blades can only rotate in the same direction during stirring, so that the stirring is not uniform, and the fermentation effect is adversely affected; meanwhile, in order to achieve a uniform fermentation effect, uniform stirring needs to be performed, however, during solid-state fermentation, along with the progress of the fermentation process, the solid-liquid state in the fermentation product changes, which causes the viscosity of the fermentation product to change, and if a motor with constant power is adopted, the problem of change of stirring speed occurs, in the prior art, the motor power is usually adjusted manually, or expensive servo motors are used for realizing uniform stirring; therefore, a solid-state fermentation device of the compound microbial inoculant is provided.

Disclosure of Invention

The technical task of the invention is to provide a solid-state fermentation device of a compound microbial inoculum to solve the problems of the background technology.

The technical scheme of the invention is realized as follows:

a solid state fermentation device of compound microbial inoculant comprises:

the storage tank is used for storing the compound microbial agent;

the supporting mechanism is used for supporting the material storage tank and is arranged at the bottom of the material storage tank;

the stirring mechanism is used for mixing and stirring the composite microbial agent in the storage tank, and is arranged in the storage tank;

and the driving mechanism is used for driving the stirring mechanism to rotate at a constant speed, and is arranged at the top of the material storage tank.

Furthermore, the storage tank includes the heat preservation jar, the bottom of heat preservation jar is the obconical structure, the center department intercommunication of heat preservation tank bottom has row material pipe, arrange and install the valve on the material pipe, there is the cover at the top of heat preservation jar through flange joint, the top intercommunication of cover has the inlet pipe, the top threaded connection of inlet pipe has sealed lid, the top intercommunication of cover has the blast pipe, install the valve on the blast pipe.

Furthermore, the surface mounting of holding jar has thermal-insulated cover shell, form the holding chamber between holding jar and the thermal-insulated cover shell, the internally mounted of holding chamber has the annular hot plate that can carry out the heating to the holding jar.

Still further, the supporting mechanism includes weld in the landing leg of thermal-insulated cover shell bottom four annular equidistance distributions, the landing leg is the slope setting.

Furthermore, the stirring mechanism comprises a first stirring part movably arranged at the center of the inner cavity of the heat-insulating tank, second stirring parts are arranged on two sides of the first stirring part, and a guide part is arranged between the second stirring part and the tank cover.

Furthermore, the first stirring part comprises an inner rod movably arranged at the top of the tank cover in a penetrating mode, the bottom end of the inner rod extends to the inner cavity of the heat preservation tank, the surface of the inner rod is fixedly connected with a plurality of first stirring blades distributed at equal intervals, the lower portion of the surface of the inner rod is fixedly connected with a spiral blade, and the upper portion of the surface of the inner rod is fixedly connected with a first driven bevel gear.

Furthermore, the second stirring part comprises an outer cylinder movably arranged at the top of the tank cover in a penetrating mode, the inner wall face of the outer cylinder is connected with the surface of the inner rod in a rotating mode, the outer surface of the outer cylinder is connected with the penetrating portion of the tank cover in a rotating mode, the bottom end of the outer cylinder is fixedly connected with a connecting plate, side rods are fixedly connected to the two sides of the bottom of the connecting plate, the bottom end of each side rod extends to the inner cavity of the heat preservation tank, second stirring blades staggered with the first stirring blades are fixedly connected to the surface of each side rod, and second driven bevel gears opposite to the first driven bevel gears are fixedly connected to the surface of the outer cylinder.

Furthermore, the guide piece comprises an annular groove formed in the top of the inner cavity of the tank cover, a sliding block is connected to the inner cavity of the annular groove in a sliding mode, and the bottom of the sliding block is fixedly connected with the top of the connecting plate.

Furthermore, a groove is formed in the sliding block, a ball is movably embedded in an inner cavity of the groove, and a rolling groove for the ball to roll is formed in an inner cavity of the annular groove.

Furthermore, the driving mechanism comprises a motor arranged at the top of the tank cover, an output shaft of the motor is fixedly connected with a driving bevel gear, and the first driven bevel gear and the second driven bevel gear are both meshed with the driving bevel gear.

Compared with the prior art, the invention has the advantages and positive effects that:

1. according to the solid-state fermentation device for the compound microbial agent, the compound microbial agent in the inner cavity of the heat-preservation tank can be fully and uniformly mixed and stirred through the arrangement of the stirring mechanism, so that a stirring blind area is avoided, and the fermentation effect is better;

2. according to the solid-state fermentation device for the compound microbial agent, the driving mechanism is arranged, so that the first stirring piece and the second stirring piece can be driven to rotate in opposite directions, the axial flow force is increased, the compound microbial agent is stirred more uniformly, and the fermentation effect of the compound microbial agent is improved;

3. the invention can continuously obtain the motor power when keeping the rotating speed by obtaining the initial parameters when the controller operates initially and then obtaining the power and the rotating speed of the motor during the operation period, thereby automatically keeping the rotating speed within a certain range at low cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a solid-state fermentation apparatus for complex microbial inoculant according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a partially cut-away structure of a storage tank of a composite microbial inoculant solid-state fermentation device according to an embodiment of the present invention;

FIG. 3 is a schematic sectional view of an insulating tank of a solid-state fermentation apparatus for complex microorganisms according to an embodiment of the present invention;

FIG. 4 is a schematic bottom view of a first stirring member of a complex microorganism inoculant solid-state fermentation device according to an embodiment of the invention;

FIG. 5 is a schematic structural diagram of a second stirring member of a solid-state fermentation apparatus for complex microbial inoculant according to an embodiment of the present invention;

FIG. 6 is a schematic sectional view showing the connection structure of a tank cover and a guide of a complex microbial inoculant solid-state fermentation apparatus according to an embodiment of the present invention;

FIG. 7 is a schematic sectional bottom view of a connecting structure between a tank cover and a guide of a complex microbial inoculant solid-state fermentation device according to an embodiment of the present invention;

FIG. 8 is an enlarged schematic view of a solid-state fermentation apparatus with complex microbial inoculant in FIG. 7 according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of the present invention performing parameter fitting.

In the figure:

1. a material storage tank; 110. a heat preservation tank; 111. a discharge pipe; 120. a can cover; 121. a feeding pipe; 122. a sealing cover; 130. an exhaust pipe; 140. a heat insulation jacket; 141. an annular heating plate; 150. a handle;

2. a support mechanism; 210. a support leg; 220. a base plate; 221. a moving wheel;

3. a stirring mechanism; 310. a first stirring member; 311. an inner rod; 312. a first stirring blade; 313. helical leaves; 314. a first driven bevel gear; 315. a strut; 316. scraping the material strip; 320. a second stirring member; 321. an outer cylinder; 322. connecting plates; 323. a side bar; 324. a second stirring blade; 325. a second driven bevel gear; 330. a guide member; 331. an annular groove; 332. a slider; 333. a groove; 334. a ball bearing; 335. rolling a groove; 340. a through hole;

4. a drive mechanism; 410. a motor; 420. a drive bevel gear;

5. a protective shell;

6. an access door.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

The invention is further described with reference to the following figures and specific examples.

Example 1

As shown in fig. 1 to 8, a solid-state fermentation apparatus for complex microbial inoculant according to an embodiment of the present invention comprises: a storage tank 1 for saving compound microbial agent, the supporting mechanism 2 that is used for supporting storage tank 1, be used for mixing stirring compound microbial agent's rabbling mechanism 3 and be used for driving 3 uniform velocity rotations actuating mechanism 4 of rabbling mechanism, it, and supporting mechanism 2 sets up in storage tank 1's bottom, and the inside of storage tank 1 is located to rabbling mechanism 3, and actuating mechanism 4 locates storage tank 1's top.

As shown in fig. 1-3, the storage tank 1 includes a heat preservation tank 110, for the convenience of discharging, the bottom of the heat preservation tank 110 is in an inverted cone structure, a material discharge pipe 111 is communicated with the center of the bottom of the heat preservation tank 110, a valve is installed on the material discharge pipe 111, the top of the heat preservation tank 110 is connected with a tank cover 120 through a flange, the top of the tank cover 120 is communicated with a feed pipe 121, the top end of the feed pipe 121 is connected with a sealing cover 122 through a thread, the top of the tank cover 120 is communicated with an exhaust pipe 130, and the exhaust pipe 130 is provided with a valve. The compound microbial inoculant can be poured into the inner cavity of the heat-preservation tank 110 through the feeding pipe 121, and is sealed by the sealing cover 122 and connected through the flange, so that the tank cover 120 can be detached from the heat-preservation tank 110 subsequently to clean the inner cavity of the heat-preservation tank 110.

As shown in fig. 1 and 2, an insulation jacket 140 is mounted on a surface of the insulation can 110, an accommodating cavity is formed between the insulation can 110 and the insulation jacket 140, and an annular heating plate 141 capable of heating the insulation can 110 is mounted inside the accommodating cavity. The heat insulation sleeve 140 and the annular heating plate 141 are matched for use, so that the compound microbial agent can be conveniently and fully fermented.

More perfectly, as shown in FIG. 1, the insulation jacket 140 has a handle 150 welded to its surface to facilitate the pushing of the storage tank 1 by the worker.

As shown in fig. 1 and 2, the supporting mechanism 2 comprises four annular and equally spaced legs 210 welded to the bottom of the insulation jacket 140, and the legs 210 are disposed in an inclined manner. The legs 210 can be used to support and raise the insulation jacket 140 for subsequent material removal.

More perfectly, as shown in fig. 1 and 2, a bottom plate 220 is horizontally disposed right below the insulation jacket 140, the top of the bottom plate 220 is fixedly connected with the bottom ends of the legs 210, and the bottom of the bottom plate 220 is provided with a moving wheel 221. The bottom plate 220 and the moving wheel 221 are matched for use, so that a worker can conveniently move the compound microbial agent solid-state fermentation device to a required position, and the flexibility of the compound microbial agent solid-state fermentation device is improved.

As shown in fig. 3, the stirring mechanism 3 includes a first stirring member 310 movably disposed at the center of the inner cavity of the thermal insulation tank 110, second stirring members 320 are disposed on both sides of the first stirring member 310, and a guiding member 330 is disposed between the second stirring member 320 and the tank cover 120.

As shown in fig. 4, the first stirring member 310 includes an inner rod 311 vertically movably disposed on the top of the tank cover 120 in a penetrating manner, the bottom end of the inner rod 311 extends to the inner cavity of the thermal insulation tank 110, a plurality of first stirring blades 312 equidistantly distributed are fixedly connected to the surface of the inner rod 311, a spiral blade 313 with a large upper part and a small lower part is fixedly connected to the lower part of the surface of the inner rod 311, and a first driven bevel gear 314 is fixedly connected to the upper part of the surface of the inner rod 311. The first stirring member 310 can be used for mixing and stirring the compound microbial inoculum in the center of the inner cavity of the heat-preservation tank 110.

More perfectly, the surface of interior pole 311 just is located horizontal fixedly connected with branch 315 between first stirring leaf 312 and the spiral leaf 313, the buckling parts of holding tank 110 inner chamber are arranged respectively in at the both ends of branch 315, make the inside buckling parts of holding tank 110 can play the auxiliary stay effect to branch 315, and then help improving interior pole 311 stability when rotating, the one end fixedly connected with of branch 315 bottom scrapes material strip 316 with the laminating of holding tank 110 inner chamber mutually, utilize and scrape material strip 316 and can play the scraper effect to the compound microbial inoculum of holding tank 110 internal face, effectively get rid of the compound microbial inoculum who bonds inside the inverted cone structure in holding tank 110 bottom.

As shown in fig. 5, the second stirring member 320 includes a vertical movable penetration outer cylinder 321 disposed at the top of the tank cover 120, an inner wall surface of the outer cylinder 321 is rotatably connected with a surface of the inner rod 311, an outer surface of the outer cylinder 321 is rotatably connected with a penetration portion of the tank cover 120, a bottom end of the outer cylinder 321 is fixedly connected with a connecting plate 322, two sides of the bottom of the connecting plate 322 are respectively and vertically fixedly connected with a side rod 323, a bottom end of the side rod 323 extends to an inner cavity of the thermal insulation tank 110, a surface of the side rod 323 is fixedly connected with a second stirring blade 324 staggered with the first stirring blade 312, and a surface of the outer cylinder 321 is fixedly connected with a second driven bevel gear 325 opposite to the first driven bevel gear 314. The second stirring member 320 can be used for mixing and stirring the composite microbial agent at the edge of the inner cavity of the heat-preservation tank 110.

As shown in fig. 6 and 7, the guiding member 330 includes an annular groove 331 opened at the top of the inner cavity of the cover 120, a sliding block 332 is slidably connected to the inner cavity of the annular groove 331, and the bottom of the sliding block 332 is fixedly connected to the top of the connecting plate 322. The annular groove 331 and the sliding block 332 are used in cooperation, so that the connecting plate 322 can be supported in an auxiliary mode, and the stability of the connecting plate 322 in rotation is improved.

More perfectly, as shown in fig. 6 and 7, the cross sections of the annular groove 331 and the sliding block 332 are T-shaped structures, which can effectively prevent the sliding block 332 from slipping from the inner cavity of the annular groove 331.

More perfectly, as shown in fig. 6, the connecting plate 322 is provided with a through hole 340 for the inner rod 311 to pass through.

As shown in fig. 7 and 8, a groove 333 is formed on the slider 332, a ball 334 is movably embedded in an inner cavity of the groove 333, and a rolling groove 335 for the ball 334 to roll is formed in an inner cavity of the annular groove 331. By utilizing the matching use of the groove 333, the ball 334 and the rolling groove 335, the friction force between the annular groove 331 and the sliding block 332 can be reduced, the flexibility of the sliding block 332 in the inner cavity of the annular groove 331 is improved, and the phenomenon of blocking is avoided.

As shown in fig. 7 and 8, the driving mechanism 4 includes a motor 410 mounted on the top of the tank cover 120, a drive bevel gear 420 is fixedly connected to an output shaft of the motor 410, and the first driven bevel gear 314 and the second driven bevel gear 325 are engaged with the drive bevel gear 420.

More perfectly, as shown in fig. 1 and 2, a protective shell 5 capable of covering the motor 410 is welded on the top of the tank cover 120, the top end of the inner rod 311 is rotatably connected with the top of the inner cavity of the protective shell 5 through a bearing, and an access door 6 is installed on the top of the protective shell 5 through a bolt. Utilize protective housing 5 and access door 6's cooperation to use, can play the guard action to motor 410, security when effectively improving motor 410 and operating.

Based on the foregoing embodiment, the present invention further provides a method for maintaining a uniform rotation of the stirring mechanism (3) at a low cost.

A controller for controlling the motor 410 is added in the driving mechanism 4; the controller can be an FPGA, a low-cost MCU and the like;

according to the working principle of the motor, the method comprises the following steps:

；

wherein P is the output power of the motor; h is a constant which is related to the inherent parameters of the motor and the working environment, such as rotor quality, rotor aging degree and the like, and h may be different for different motors and motors with different service times;

the working efficiency of the motor is a positive fixed value which is less than 1 and greater than 0; t is an output torque, which is related to the blend, and in the present invention, the properties of the blend are changed according to the progress of fermentation, and T is also changed, and T is generally very difficult to measure; n is the rotation speed, the unit is the rotation speed/minute, and the rotation speed can be directly obtained through a motor or measured through a sensor.

To simplify the formula, constants are unified and recorded

；

Then there are:

；

in the initial working period, the controller performs trial operation with different powers not less than 2 times, and the properties of the fermentation product are not changed at the initial stage, so the viscosity can be regarded as unchanged, and the moment T is unchanged, so that the following steps are performed:

；

；

wherein the content of the first and second substances,

for the power used in the i-th experiment,

is the rotating speed at the time of the ith experiment,

the initial moment.

Multiple groups of experimental data can be obtained through an initial experiment, h can be obtained by fitting the multiple groups of experimental data, as shown in fig. 9, the h is obtained as three times of experimental data, the h is obtained as a straight line by fitting the three times of experimental data, and the intersection point of the straight line and the y axis is the h.

In the fermentation process, regularly acquire power, the output rotational speed of motor, then have:

；

wherein

Is the motor power at the time of the kth measurement,

the output torque at the kth measurement was changed due to the fermentation property during the fermentation process

Also changes, and

it is very difficult to measure accurately the amount of,

the rotation speed at the k-th measurement.

When the power is unchanged, the (k + 1) th measurement is as follows:

；

if at that time

It is explained that the change of the property of the fermented product causes the change of T and further the change of the rotating speed, and the power of the motor needs to be adjusted to maintain the rotating speed.

In this case:

；

is provided with

Adjusting power to target, to maintain rotational speed

Then there are:

；

simultaneous:

；

and further:

；

thus, the regulated power:

；

by the method, the controller can acquire h at the initial operation time, and then acquire the power and the rotating speed of the motor during the operation period, namely the power of the motor during the rotating speed maintaining can be continuously acquired, so that the rotating speed can be automatically maintained within a certain range at low cost.

In practical application

Firstly, the solid-state fermentation device of the compound microbial inoculum is moved to a required position by the aid of the moving wheel 221 by the aid of the handle 150, the sealing cover 122 is opened, the compound microbial inoculum is added into the inner cavity of the heat preservation tank 110 through the feeding pipe 121, and then the sealing cover 122 is tightly covered;

secondly, the motor 410 is started, an output shaft of the motor 410 drives the driving bevel gear 420 to rotate, the driving bevel gear 420 drives the first driven bevel gear 314 to rotate forward by taking the inner rod 311 as an axis, and simultaneously drives the second driven bevel gear 325 to rotate backward by taking the outer barrel 321 as an axis, the first driven bevel gear 314 drives the inner rod 311, the first stirring blade 312, the support rod 315, the spiral blade 313 and the scraping strip 316 to rotate forward synchronously, the second driven bevel gear 325 drives the outer barrel 321, the connecting plate 322, the side rod 323 and the second stirring blade 324 to rotate backward synchronously, so that the first stirring blade 312 and the second stirring blade 324 stir the composite microbial inoculum in the heat preservation tank 110 in opposite directions, at the moment, the connecting plate 322 drives the sliding block 332 to annularly slide in the inner cavity of the annular groove 331 by taking the outer barrel 321 as an axis, the sliding block 334 drives the groove 333 and the rolling balls to synchronously slide, so that the rolling balls 334 roll in the inner cavity of the groove 333 and also slide in the inner cavity of the rolling groove 335, and the composite microbial inoculum in the heat preservation tank 110 is heated by the annular heating plate 141 according to fermentation requirements during stirring;

and finally, after the fermentation is finished, placing a material collecting barrel on the bottom plate 220, and opening a valve on the material discharging pipe 111 to discharge the compound microbial agent in the inner cavity of the heat-insulating tank 110 through the material discharging pipe 111.

According to the solid-state fermentation device for the compound microbial agent, the compound microbial agent in the inner cavity of the heat-preservation tank 110 can be fully and uniformly mixed and stirred through the arrangement of the stirring mechanism 3, so that a stirring blind area is avoided, and the fermentation effect is better; through actuating mechanism 4's setting, can drive the rotation direction of first stirring 310 and second stirring 320 opposite, increase axial flow power, and then make more even of compound microbial inoculant stirring to help improving the fermentation effect of compound microbial inoculant.

The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the embodiments disclosed, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.

Claims

1. A solid state fermentation device of compound microorganism bacterium agent, characterized by comprising:

a storage tank (1) for storing a compound microbial agent,

the supporting mechanism (2) is used for supporting the storage tank (1), and the supporting mechanism (2) is arranged at the bottom of the storage tank (1);

the stirring mechanism (3) is used for mixing and stirring the composite microbial agent in the storage tank (1), and the stirring mechanism (3) is arranged in the storage tank (1);

and the driving mechanism (4) is used for driving the stirring mechanism (3) to rotate at a constant speed, and the driving mechanism (4) is arranged at the top of the material storage tank (1).

2. The solid-state fermentation device of compound microbial inoculant according to claim 1, wherein the storage tank (1) comprises a heat-preservation tank (110), a material discharging pipe (111) is communicated with the center of the bottom of the heat-preservation tank (110), a valve is installed on the material discharging pipe (111), a tank cover (120) is connected to the top of the heat-preservation tank (110) through a flange, a feeding pipe (121) is communicated to the top of the tank cover (120), a sealing cover (122) is connected to the top end of the feeding pipe (121) in a threaded manner, an exhaust pipe (130) is communicated to the top of the tank cover (120), and a valve is installed on the exhaust pipe (130).

3. The solid state fermentation device of compound microbial inoculant according to claim 2, wherein the surface of the thermal insulation tank (110) is provided with a heat insulation casing (140), a containing cavity is formed between the thermal insulation tank (110) and the heat insulation casing (140), and an annular heating plate (141) capable of heating the thermal insulation tank (110) is arranged in the containing cavity.

4. The solid state fermentation device of claim 3, wherein said support mechanism (2) comprises four annular and equally spaced legs (210) welded to the bottom of the heat insulation casing (140), said legs (210) being disposed in an inclined manner.

5. The solid state fermentation device of a complex microbial inoculant according to claim 2, wherein the stirring mechanism (3) comprises a first stirring member (310) movably arranged at the center of the inner cavity of the heat-preserving tank (110), second stirring members (320) are arranged on both sides of the first stirring member (310), and a guide member (330) is arranged between the second stirring member (320) and the tank cover (120).

6. The solid state fermentation device of a compound microbial inoculant according to claim 5, wherein the first stirring member (310) comprises an inner rod (311) movably penetrating through the top of the tank cover (120), the bottom end of the inner rod (311) extends to the inner cavity of the heat-preservation tank (110), the surface of the inner rod (311) is fixedly connected with a plurality of first stirring blades (312) which are distributed at equal intervals, the lower part of the surface of the inner rod (311) is fixedly connected with a spiral blade (313), and the upper part of the surface of the inner rod (311) is fixedly connected with a first driven bevel gear (314).

7. The solid state fermentation device of a compound microbial inoculant according to claim 6, wherein the second stirring member (320) comprises an outer cylinder (321) movably penetrating through the top of the tank cover (120), the inner wall surface of the outer cylinder (321) is rotatably connected with the surface of the inner rod (311), the outer surface of the outer cylinder (321) is rotatably connected with the penetrating part of the tank cover (120), the bottom end of the outer cylinder (321) is fixedly connected with a connecting plate (322), both sides of the bottom of the connecting plate (322) are fixedly connected with side rods (323), the bottom ends of the side rods (323) extend to the inner cavity of the heat-insulating tank (110), the surface of the side rods (323) is fixedly connected with second stirring blades (324) staggered with the first stirring blades (312), and the surface of the outer cylinder (321) is fixedly connected with a second driven bevel gear (325) opposite to the first driven bevel gear (314).

8. The solid state fermentation device of claim 7, wherein the guiding member (330) comprises an annular groove (331) formed at the top of the inner cavity of the tank cover (120), the inner cavity of the annular groove (331) is slidably connected with a sliding block (332), and the bottom of the sliding block (332) is fixedly connected with the top of the connecting plate (322).

9. The solid-state fermentation device of a compound microbial inoculant according to claim 8, wherein the slide block (332) is provided with a groove (333), a ball (334) is movably embedded in an inner cavity of the groove (333), and a rolling groove (335) for the ball (334) to roll is formed in an inner cavity of the annular groove (331).

10. The solid state fermentation device for compound microbial inoculant according to claim 7, wherein the driving mechanism (4) comprises a motor (410) installed on the top of the tank cover (120), an output shaft of the motor (410) is fixedly connected with a driving bevel gear (420), and the first driven bevel gear (314) and the second driven bevel gear (325) are both meshed with the driving bevel gear (420).