CN113699019B

CN113699019B - Microbial fermentation equipment is used in production of polylactic acid raw materials

Info

Publication number: CN113699019B
Application number: CN202111272439.6A
Authority: CN
Inventors: 曹勇民; 王少卿; 曾少华
Original assignee: Suzhou Huannuo New Material Technology Co ltd
Current assignee: Suzhou Huannuo New Material Technology Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-06-24
Anticipated expiration: 2041-10-29
Also published as: CN113699019A

Abstract

The invention discloses microbial fermentation equipment for producing a polylactic acid raw material, which comprises a fermentation tank, wherein the upper end of the fermentation tank is provided with a top cover, the fermentation tank is provided with an inner cavity, and the top cover is provided with a motor. The invention relates to a microbial fermentation device for producing a polylactic acid raw material, which belongs to the technical field of polylactic acid production, wherein a stirring frame can form local stirring, so that the stirring and mixing effects are improved, a helical blade is arranged, the raw material generates a reaction force on the helical blade, so that the helical blade is driven to rotate, the helical stirring effect can be realized without a plurality of driving sources, a connecting frame is convenient to independently disassemble the corresponding stirring frame, a spring and other structures are adopted, the stability after installation is ensured, the cleaning effect can be realized when the inside of a fermentation tank is cleaned through the arranged cleaning structure, the cleaning effect on the fermentation tank is ensured, a clamping and installing structure is arranged, and the cleaning structure can be assembled and disassembled without disassembling a stirring mechanism.

Description

Microbial fermentation equipment is used in production of polylactic acid raw materials

Technical Field

The invention relates to the technical field of polylactic acid production, in particular to a microbial fermentation device for producing a polylactic acid raw material.

Background

Polylactic acid, also known as polylactide, is a polyester polymer obtained by polymerizing lactic acid as a main raw material, is a novel biodegradable material, is a resin material prepared by fermenting and processing agricultural products such as sugarcane, corn, cassava and the like by microorganisms, has the characteristics of transparency, low carbon, environmental protection, no toxicity, no irritation, good biocompatibility, processability, excellent mechanical property and the like, and the market price of the polylactic acid is lower than that of other compostable degradable materials. In the processing of the polylactic acid resin material, the raw material needs to be subjected to microbial fermentation, and thus a fermentation tank is used.

When the microbial fermentation tank is used, raw materials and the like are added into the tank body, the raw materials are ensured to be in a proper temperature range, and then the fermentation is carried out after the raw materials are sealed and stirred. The Chinese patent numbers are: in the yogurt lactic acid bacteria fermentation equipment disclosed in CN209412223U, the stationary fermentation liquid can be sufficiently stirred by arranging the outer spiral blade and the inner spiral blade on the spiral stirring rod, so that the fermentation sufficiency is ensured, and the fermentation quality and efficiency are improved. However, in the above patent, although the stirring is simply performed by using the helical blade structure, the stirring can be performed sufficiently, but in the stirring process, the local stirring cannot be performed, the stirring effect is general, and the cleaning structure is not provided, which is not favorable for the washing work, and there are certain options for using the cleaning device.

Disclosure of Invention

The invention mainly aims to provide microbial fermentation equipment for producing a polylactic acid raw material, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a microbial fermentation device for producing a polylactic acid raw material comprises a fermentation tank, wherein a top cover is arranged at the upper end of the fermentation tank, an inner cavity is arranged on the fermentation tank, a motor is arranged on the top cover, a rotating rod is connected onto the motor and is positioned in the inner cavity, a heating shell is arranged on the fermentation tank, a supporting frame is fixedly arranged at the lower end of the fermentation tank, a stirring structure is fixedly arranged at the lower end of the rotating rod and comprises a fixed rod, a connecting rod, a stirring rod, a connecting frame and a stirring frame, the connecting rod is connected onto the fixed rod and is fixedly connected with the stirring rod, the connecting frame is fixedly connected with the stirring frame and is arranged on the stirring rod, a cleaning structure is arranged on the rotating rod and comprises a support, an installation sleeve and a cleaning frame, the support is fixedly connected with the installation sleeve, and the installation sleeve is installed on the rotating rod, and the cleaning frame is fixedly connected with the bracket.

Preferably, the top cover is fixedly connected with the fermentation tank, a sealing ring is arranged at the position where the top cover contacts with the fermentation tank, and a feeding pipe is fixedly mounted on the top cover.

Preferably, the lower extreme fixed mounting of fermentation cylinder has row's material pipe, and is linked together between arranging the inner chamber on material pipe and the fermentation cylinder, fixed mounting has the backup pad on the rotary rod, and contacts between the backup pad and the installation cover that cleans in the structure, and the backup pad plays the effect of support, avoids cleaning and drops when the structure installation is unstable and influences normal stirring.

Preferably, stirring structure still includes fixed cover, baffle, horizontal pole and connecting screw, dead lever fixed mounting is in the lower extreme of rotary rod, fixed connection between connecting rod and the fixed cover, and fixed cover locates on the dead lever, baffle threaded connection is in the lower extreme position department of dead lever, through the stirring structure who sets up, adopts the puddler cooperation to stir the frame and uses, is carrying out the in-process that whole stirring mixes, and helical blade in the stir frame can form local stirring along with the dwang is rotatory, and then has improved the effect that the stirring mixes.

Preferably, the cross rod is fixed on the stirring rod, a slot is formed in the stirring rod, the connecting screw is arranged on the stirring rod and connected with the connecting frame, and the connecting frame is fixedly connected with the stirring rod through the connecting screw.

Preferably, the link includes mounting panel, mounting hole, inserted block, spring and screw hole, the mounting hole is seted up on the mounting panel, the tip of inserted block sets up in the mounting panel, and the other end of inserted block inserts in the slot, the spring sets up in the mounting panel, and the tip of spring respectively with mounting panel, inserted block fixed connection, the upper end of mounting panel is seted up to the screw hole, and threaded connection between screw hole and the connecting screw, waist type hole has been seted up on the mounting panel, fixed mounting has the gag lever post on the inserted block, and the gag lever post passes waist type hole, adopts the link to carry out the installation work of agitator, can dismantle the change to single agitator, uses the flexibility high, adopts spring isotructure in the link simultaneously, guarantees the steadiness after the installation, the smooth and easy nature when the guarantee is dismantled.

Preferably, the agitator includes roating seat, dwang and helical blade, the dwang rotates and installs on the roating seat, and roating seat fixed mounting in the mounting hole on the mounting panel, helical blade fixed mounting sets up helical blade on the dwang, rotates the in-process at whole stirring structure, and helical blade takes place relative displacement with the inside raw materials of fermentation cylinder, and the raw materials produces reaction force to helical blade to driving helical blade and rotating, not needing many driving sources can realize the effect of spiral stirring.

Preferably, clean the structure and still include connecting plate, construction bolt, nut and fastening screw, the connecting plate sets up on the installation cover, and the installation cover is located on the rotary rod, construction bolt runs through in the connecting plate, nut threaded connection is in construction bolt's end, installation cover, connecting plate are fixed in on the rotary rod through construction bolt, nut, fastening screw sets up on the support, clean the frame through fixed connection between fastening screw and the support, through the structure of cleaning that sets up, can play the effect of cleaning when washing fermentation cylinder inside, guarantee the washing effect to the fermentation cylinder, set up the structure of centre gripping installation, need not dismantle the stirring structure and can carry out the installation dismantlement work to cleaning the structure, simplified the installation dismantlement process to cleaning the structure.

Preferably, the cleaning frame comprises a cleaning plate and a brush, the brush is fixedly installed on the outer side of the cleaning plate, the brush is evenly distributed on the outer side of the cleaning plate, the cleaning frame is installed through fastening screws, the cleaning frame is convenient to detach and replace, and the cleaning effect is guaranteed.

Preferably, the support frame includes landing leg, bottom plate, screw rod and hexagonal piece, the landing leg is fixed in the lower extreme of fermentation cylinder, fixed connection between bottom plate and the screw rod, and screw rod threaded connection is in the lower extreme of landing leg, hexagonal piece fixed mounting is close to the position department of bottom plate on the screw rod, and the support frame can be adjusted, guarantees that the fermentation cylinder places the steadiness.

Compared with the prior art, the invention has the following beneficial effects: according to the microbial fermentation equipment for producing the polylactic acid raw material, 1, the stirring rod is matched with the stirring frame for use through the arranged stirring structure, and in the process of integral stirring and mixing, the helical blade in the stirring frame rotates along with the rotating rod to form local stirring, so that the stirring and mixing effects are improved;

2. the helical blades are arranged, in the rotating process of the whole stirring structure, the helical blades and raw materials in the fermentation tank are subjected to relative displacement, and the raw materials generate reaction force on the helical blades, so that the helical blades are driven to rotate, and the helical stirring effect can be realized without a plurality of driving sources;

3. the connecting frame is adopted for mounting the stirring frame, the single stirring frame can be detached and replaced, the use flexibility is high, and meanwhile, the connecting frame adopts a spring structure and the like, so that the stability after mounting is ensured, and the smoothness during detachment is ensured;

4. through the arranged cleaning structure, the cleaning effect can be achieved when the interior of the fermentation tank is cleaned, and the cleaning effect on the fermentation tank is ensured;

5. the clamping and mounting structure is arranged, so that the cleaning structure can be mounted and dismounted without dismounting the stirring structure, and the mounting and dismounting process of the cleaning structure is simplified;

6. the cleaning frame is installed through fastening screws, so that the cleaning frame is convenient to detach and replace, and the cleaning effect is guaranteed.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 2 is a schematic view of the internal structure of a fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 3 is a schematic structural diagram of a rotating rod of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 4 is a schematic structural diagram of a stirring structure of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 5 is a schematic structural diagram of a connecting frame of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 6 is a schematic structural diagram of a stirring rack of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 7 is a schematic structural diagram of a cleaning structure of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention;

FIG. 8 is a schematic structural diagram of a cleaning frame of a microbial fermentation apparatus for producing a polylactic acid material according to the present invention;

FIG. 9 is a schematic structural diagram of a supporting frame of a microbial fermentation apparatus for producing a polylactic acid raw material according to the present invention.

In the figure: 1. a fermentation tank; 2. a top cover; 3. an inner cavity; 4. an electric motor; 5. rotating the rod; 6. heating the housing; 7. a stirring structure; 701. fixing the rod; 702. a connecting rod; 703. fixing a sleeve; 704. a baffle plate; 705. a stirring rod; 706. a cross bar; 707. a connecting frame; 7071. mounting a plate; 7072. mounting holes; 7073. inserting a block; 7074. a spring; 7075. a threaded hole; 708. a connecting screw; 709. a stirring frame; 7091. a rotating base; 7092. rotating the rod; 7093. a helical blade; 710. a slot; 8. a cleaning structure; 801. a support; 802. installing a sleeve; 803. a connecting plate; 804. installing a bolt; 805. a nut; 806. a cleaning frame; 8061. cleaning the board; 8062. a brush; 807. fastening screws; 9. a support plate; 10. a support frame; 1001. a support leg; 1002. a base plate; 1003. a screw; 1004. a hexagonal block; 11. a feeding pipe; 12. a discharge pipe.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Example one

As shown in figures 1-9, a microbial fermentation device for producing polylactic acid raw material comprises a fermentation tank 1, a top cover 2 is arranged at the upper end of the fermentation tank 1, an inner cavity 3 is arranged on the fermentation tank 1, a motor 4 is arranged on the top cover 2, a rotary rod 5 is connected to the motor 4, the rotary rod 5 is positioned in the inner cavity 3, a heating shell 6 is arranged on the fermentation tank 1, a support frame 10 is fixedly arranged at the lower end of the fermentation tank 1, a stirring structure 7 is fixedly arranged at the lower end of the rotary rod 5, a cleaning structure 8 is arranged on the rotary rod 5, the top cover 2 is fixedly connected with the fermentation tank 1, a sealing ring is arranged at the position where the top cover 2 contacts with the fermentation tank 1, a feeding pipe 11 is fixedly arranged on the top cover 2, a discharging pipe 12 is fixedly arranged at the lower end of the fermentation tank 1, the discharging pipe 12 is communicated with the inner cavity 3 on the fermentation tank 1, and a support plate 9 is fixedly arranged on the rotary rod 5, and the supporting plate 9 contacts with the mounting sleeve 802 in the cleaning structure 8, the supporting frame 10 comprises a supporting leg 1001, a bottom plate 1002, a screw 1003 and a hexagonal block 1004, the supporting leg 1001 is fixed at the lower end of the fermentation tank 1, the bottom plate 1002 and the screw 1003 are fixedly connected, the screw 1003 is in threaded connection with the lower end of the supporting leg 1001, and the hexagonal block 1004 is fixedly mounted on the screw 1003 at a position close to the bottom plate 1002.

When the fermentation tank is used, the fermentation tank 1 is placed at a proper place and is supported by the support frame 10, a worker rotates the hexagonal block 1004 by using a tool, the hexagonal block 1004 drives the screw 1003 and the bottom plate 1002 to rotate, so that the screw 1003 rotates and lifts on the support legs 1001 until all the bottom plates 1002 are in close contact with the ground, stable placement of equipment is guaranteed, fermentation work is started after corresponding line pipelines are connected, raw materials are put into the inner cavity 3 through the feeding pipe 11 on the top cover 2, the feeding pipe 11 is closed after the raw materials are put into the inner cavity, the motor 4 is started, the motor 4 runs and drives the rotating rod 5 to rotate, the rotating rod 5 drives the stirring structures 7 and the like to rotate, so that the raw materials are stirred and mixed, the stirring work is stopped after the raw materials are fully stirred and mixed, then the heating coil in the heating shell 6 is started, and the heating coil generates heat to act on the inner cavity 3, make the raw materials in inner chamber 3 be in suitable temperature range, then wait for the raw materials fermentation can, after the raw materials fermentation finishes, the staff opens the valve on arranging material pipe 12, with the raw materials discharge can, then wash fermentation cylinder 1, during the washing, add appropriate amount of water in to inner chamber 3 through pan feeding pipe 11, starter motor 4 afterwards, motor 4 takes the operation of structures such as rotary rod 5, clean structure 8 and clean 1 inner wall of fermentation cylinder, and then realize cleaning work, it can to get rid of sewage after finishing cleaning.

Example two

As shown in fig. 1 to 9, in which the same or corresponding components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment in that: as shown in fig. 4, 5 and 6, the stirring structure 7 includes a fixing rod 701, a connecting rod 702, a stirring rod 705, a connecting frame 707 and a stirring frame 709, the connecting rod 702 is connected to the fixing rod 701, the connecting rod 702 is fixedly connected to the stirring rod 705, the connecting frame 707 is fixedly connected to the stirring frame 709, the connecting frame 707 is mounted on the stirring rod 705, the stirring structure 7 further includes a fixing sleeve 703, a baffle 704, a cross rod 706 and a connecting screw 708, the fixing rod 701 is fixedly mounted at the lower end of the rotating rod 5, the connecting rod 702 is fixedly connected to the fixing sleeve 703, the fixing sleeve 703 is sleeved on the fixing rod 701, the baffle 704 is screwed to the lower end of the fixing rod 701, the cross rod 706 is fixed to the stirring rod 705, the stirring rod 705 is provided with a slot 710, the connecting screw 708 is disposed on the stirring rod 705, the connecting screw 708 is connected to the connecting frame 707, the connecting frame 707 is fixedly connected to the stirring rod 705 via the connecting screw 708, the connecting frame 707 includes an installation plate 7071, an installation hole 7072, an insertion block 7073, a spring 7074 and a threaded hole 7075, the installation hole 7072 is provided on the installation plate 7071, an end portion of the insertion block 7073 is provided in the installation plate 7071, and the other end of the insertion block 7073 is inserted into the slot 710, the spring 7074 is provided in the installation plate 7071, and an end portion of the spring 7074 is respectively fixedly connected with the installation plate 7071 and the insertion block 7073, the threaded hole 7075 is provided at an upper end of the installation plate 7071, and the threaded hole 7075 is in threaded connection with the connecting screw 708, a kidney-shaped hole is provided on the installation plate 7071, a limit rod is fixedly installed on the insertion block 7073, and penetrates through the kidney-shaped hole, the agitator 709 includes a rotating base 7091, a rotating rod 7092 and a helical blade 7093, the rotating base 7092 is rotatably installed on the rotating base 7091, and the rotating base 7091 is fixedly installed in the installation hole 7072 on the installation plate 7071, and the helical blade 7093 is fixedly installed on the rotating base 7092.

In the process of stirring the raw materials, the rotating rod 5 rotates to drive the fixing rod 701 at the lower end to rotate, the fixing rod 701 drives the fixing sleeve 703, the connecting rod 702 and other structures to rotate, so as to drive the stirring rod 705 to rotate to stir and mix the raw materials, meanwhile, the connecting frame 707 drives the stirring frame 709 to rotate together in the inner cavity 3, in the rotating process of the stirring frame 709, acting force and reacting force are generated between the spiral blade 7093 and the raw materials, under the driving of the reacting force of the raw materials, the spiral blade 7093 rotates on the rotating seat 7091 through the rotating rod 7092, so as to form local stirring, further the whole stirring and mixing effect is improved, when one stirring frame 709 is damaged and needs to be replaced, a worker can turn off the connecting screw 708 on the stirring rod 705 and then move the limiting rod in the kidney-shaped hole, the limiting rod drives the insert 7073 to move along the mounting plate 7071 and compress the spring 7074, after the insert 7073 is pulled out of the slot 710 of the cross bar 706, the whole connecting rack 707 and the stirring rack 709 are removed, when the brand-new stirring frame 709 and other structures are replaced and installed, the insert block 7073 is moved by the limiting rod and is accommodated in the installation plate 7071, the mounting plate 7071 is then placed between the agitator 705 and the cross bar 706 such that the inserts 7073 are aligned with the slots 710, and then the stop bar is released, the inserts 7073 move along the mounting plate 7071 under the urging of the springs 7074, until the inserts 7073 are inserted into the slots 710, the distal end of the attachment screw 708 is then passed through the agitator shaft 705, the distal end of the attachment screw 708 is threaded into the threaded aperture 7075, further, the installation work is completed, the stirring rack 709 can be used continuously after being replaced, if the structure of the stirring rod 705 and the like needs to be disassembled, the worker can unscrew the screw on the fixing sleeve 703, unscrew the baffle 704, and pull the fixing sleeve 703 off from the fixing rod 701.

EXAMPLE III

As shown in fig. 1 to 9, in which the same or corresponding components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The third embodiment is different from the first embodiment in that: as shown in fig. 7 and 8, the cleaning structure 8 includes a bracket 801, a mounting sleeve 802 and a cleaning frame 806, the bracket 801 is fixedly connected with the mounting sleeve 802, the mounting sleeve 802 is mounted on the rotating rod 5, the cleaning frame 806 is fixedly connected with the bracket 801, the cleaning structure 8 further comprises a connecting plate 803, a mounting bolt 804, a nut 805 and a fastening screw 807, the connecting plate 803 is arranged on the mounting sleeve 802, the mounting sleeve 802 is sleeved on the rotating rod 5, the mounting bolt 804 penetrates through the connecting plate 803, the nut 805 is in threaded connection with the tail end of the mounting bolt 804, the mounting sleeve 802 and the connecting plate 803 are fixed on the rotating rod 5 through the mounting bolt 804 and the nut 805, the fastening screw 807 is arranged on the support 801, the cleaning frame 806 is fixedly connected with the support 801 through the fastening screw 807, the cleaning frame 806 comprises a cleaning plate 8061 and a brush 8062, the brush 8062 is fixedly mounted on the outer side of the cleaning plate 8061, and the brush 8062 is uniformly distributed on the outer side of the cleaning plate 8061.

During cleaning of the fermentation tank 1, when the cleaning structure 8 rotates, the brush 8062 in the cleaning frame 806 contacts the inner wall of the fermentation tank 1 and cleans the fermentation tank, so that the cleaning effect is ensured, in the using process, the supporting plate 9 can avoid the influence caused by the unstable installation and falling of the cleaning structure 8, after the cleaning structure 8 is used for multiple times, the brush 8062 is large in loss and needs to be replaced, a worker unscrews a screw on the bracket 801, detaches the cleaning plate 8061 from the bracket 801 and then replaces the cleaning plate 8061, and can use the cleaning plate after being replaced and then installed again, if the whole cleaning structure 8 needs to be detached, the installation bolt 804 and the nut 805 on the connecting plate 803 are unscrewed, the installation sleeve 802 is taken down from the rotating rod 5, when the cleaning structure needs to be installed again for use, the installation sleeve 802 is sleeved on the rotating rod 5, so that the holes on the connecting plate 803 are aligned, then the installation bolt 804 passes through the hole, the nut 805 is screwed at the tail end of the installation bolt 804, and then accomplish the installation fixing work can, simple structure, convenient operation, the installation is dismantled the in-process and need not dismantle stirring structure 7, has spoken operation process, has improved the operation flexibility.

The foregoing has described the principles of use, features and advantages of the invention. The above embodiments and the description of the invention are provided to illustrate the basic principles and features of the invention and, within the scope of the invention concept, to be understood by those skilled in the art from the foregoing description, various modifications may be made to the invention and these modifications are within the scope of the invention as claimed.

Claims

1. The utility model provides a production of polylactic acid raw materials is with microbial fermentation equipment, includes fermentation cylinder (1), the upper end of fermentation cylinder (1) is equipped with top cap (2), and is equipped with inner chamber (3) on fermentation cylinder (1), be equipped with motor (4) on top cap (2), and be connected with rotary rod (5) on motor (4), rotary rod (5) are arranged in inner chamber (3), be equipped with heating shell (6) on fermentation cylinder (1), and the lower extreme fixed mounting of fermentation cylinder (1) has support frame (10), its characterized in that: the lower end of the rotating rod (5) is fixedly provided with a stirring structure (7), the stirring structure (7) comprises a fixing rod (701), a connecting rod (702), a stirring rod (705), a connecting frame (707) and a stirring frame (709), the connecting rod (702) is connected to the fixing rod (701), the connecting rod (702) is fixedly connected with the stirring rod (705), the connecting frame (707) is fixedly connected with the stirring frame (709), the connecting frame (707) is installed on the stirring rod (705), the rotating rod (5) is provided with a cleaning structure (8), the cleaning structure (8) comprises a support (801), an installation sleeve (802) and a cleaning frame (806), the support (801) is fixedly connected with the installation sleeve (802), the installation sleeve (802) is installed on the rotating rod (5), the cleaning frame (806) is fixedly connected with the support (801), the stirring structure (7) further comprises a fixing sleeve (703), a baffle (704), a cross rod (706) and a connecting screw (708), the fixing rod (701) is fixedly installed at the lower end of the rotating rod (5), the connecting rod (702) is fixedly connected with the fixing sleeve (703), the fixing sleeve (703) is sleeved on the fixing rod (701), the baffle (704) is in threaded connection with the lower end of the fixing rod (701), the cross rod (706) is fixed on the stirring rod (705), a slot (710) is formed in the stirring rod (705), the connecting screw (708) is arranged on the stirring rod (705), the connecting screw (708) is connected with a connecting frame (707), the connecting frame (707) is fixedly connected with the stirring rod (705) through the connecting screw (708), and the cleaning structure (8) further comprises a connecting plate (803), a mounting bolt (804), Nut (805) and fastening screw (807), connecting plate (803) sets up on installation cover (802), and installation cover (802) cover is located on rotary rod (5), installation bolt (804) run through in connecting plate (803), nut (805) threaded connection is in the terminal of installation bolt (804), installation cover (802), connecting plate (803) are fixed in rotary rod (5) through installation bolt (804), nut (805), fastening screw (807) set up on support (801), clean frame (806) through fastening screw (807) and support (801) between fixed connection, clean frame (806) including cleaning board (8061) and brush (8062), brush (8062) fixed mounting is in the outside of cleaning board (8061), and brush (8062) evenly distributed on the outside of cleaning board (8061), connecting frame (707) includes mounting panel (7071), Mounting hole (7072), inserted block (7073), spring (7074) and screw hole (7075), mounting hole (7072) are seted up on mounting panel (7071), the tip of inserted block (7073) sets up in mounting panel (7071), and the other end of inserted block (7073) inserts in slot (710), spring (7074) sets up in mounting panel (7071), and the tip of spring (7074) respectively with mounting panel (7071), inserted block (7073) fixed connection, screw hole (7075) are seted up in the upper end of mounting panel (7071), and threaded connection between screw hole (7075) and connecting screw (708), waist type hole has been seted up on mounting panel (7071), fixed mounting has the gag lever post on inserted block (7073), and the gag lever post passes waist type hole, agitator (709) include roating seat (7091), dwang (7092) and helical blade (7093), install on roating seat (7091) is rotated, and the rotary seat (7091) is fixedly arranged in an installation hole (7072) on an installation plate (7071), and the helical blade (7093) is fixedly arranged on the rotating rod (7092).

2. The microbial fermentation apparatus for producing a polylactic acid raw material according to claim 1, wherein: fixed connection between top cap (2) and fermentation cylinder (1), and the position that top cap (2) and fermentation cylinder (1) contacted is equipped with the sealing washer, and fixed mounting has pan feeding pipe (11) on top cap (2).

3. The microbial fermentation apparatus for producing a polylactic acid raw material according to claim 2, wherein: the lower extreme fixed mounting of fermentation cylinder (1) arranges material pipe (12), and arranges and is linked together between inner chamber (3) on material pipe (12) and the fermentation cylinder (1), fixed mounting has backup pad (9) on rotary rod (5), and contacts between backup pad (9) and installation cover (802) in cleaning structure (8).

4. The microbial fermentation apparatus for producing a polylactic acid raw material according to claim 1, wherein: the supporting frame (10) comprises supporting legs (1001), a bottom plate (1002), a screw rod (1003) and a hexagonal block (1004), the supporting legs (1001) are fixed at the lower end of the fermentation tank (1), the bottom plate (1002) is fixedly connected with the screw rod (1003), the screw rod (1003) is in threaded connection with the lower end of the supporting legs (1001), and the hexagonal block (1004) is fixedly installed on the screw rod (1003) at a position close to the bottom plate (1002).