Liquid strain mixed fermentation device for mushroom planting

Abstract

The invention belongs to the technical field of liquid strain fermentation, and discloses a liquid strain mixed fermentation device for mushroom planting, which comprises a fermentation tank and an inner container movably mounted in the fermentation tank, a liquid discharge pipe is fixedly mounted at the bottom of the fermentation tank, the liquid discharge pipe is movably sleeved in the inner container, and the liquid strain mixed fermentation device further comprises a stirring paddle mechanism and a stopper, the two are arranged at the bottom of the inner container in an annular array; the driving assembly and the oxygen supply assembly are arranged at the bottom of the fermentation tank. According to the scheme, the driving assembly is operated to drive the inner container to rotate, so that the liquid strains in the inner container synchronously rotate along with the inner container, and the mixed strains in the tank can impact the paddles to enable the paddles to rotate, so that the impact area with the liquid strains is reduced, and the strains are guided; at the moment, the paddles can be slowly reset under the action of self elasticity, and the contact surfaces of the paddles and the strains are increased along with the rotating speed of the mixed strains in the inner container, so that the mixing efficiency is improved, and meanwhile, the problem that hyphae are torn due to overhigh rotating speed of the stirring paddles is solved.

Description

Technical Field

[0001] This invention belongs to the field of liquid microbial fermentation technology, specifically a liquid microbial spawn mixing and fermentation device for mushroom cultivation. Background Technology

[0002] Liquid mushroom spawn is produced through submerged liquid culture technology. It involves the rapid proliferation of mycelium in a specific nutrient solution via synergistic multi-species culture or the combination of mycelium and substrate, resulting in a suspended pure culture. The core principle is to utilize a fermenter to simulate the optimal environment for mycelial growth.

[0003] During microbial fermentation, operators typically install a stirring paddle inside the tank. The paddle's rotation prevents metabolic stagnation or autolysis of the mycelium due to localized oxygen deficiency. It also ensures the even distribution of nutrients such as carbon and nitrogen sources in the culture medium, avoiding localized excessively high or low concentrations. However, if the paddle rotates too fast, the resulting shear force can directly tear the mycelium, leading to mycelial breakage or cell wall damage, thus reducing the activity of the microorganisms. Conversely, if the paddle rotates too slowly, the insufficient shear force causes the mycelium to clump together, resulting in uneven nutrient distribution within the fermenter. This also prevents the mycelium from evenly contacting the carbon and nitrogen sources, potentially leading to nutrient overabundance or deficiency in certain areas.

[0004] Therefore, in order to solve the above problems, a liquid inoculum mixing and fermentation device for mushroom cultivation is proposed. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention provides a liquid spawn mixing and fermentation device for mushroom cultivation, which solves the problems that excessive stirring speed will cause mycelium to be torn, and excessively low stirring speed will cause uneven nutrient distribution in the fermentation tank.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a liquid spawn mixing and fermentation device for mushroom cultivation, comprising a fermentation tank and an inner liner movably installed therein, wherein an exhaust valve is fixedly connected to the top of the fermentation tank, and a drain pipe is fixedly installed at the bottom of the fermentation tank, the drain pipe being movably sleeved within the inner liner; and further comprising: a stirring paddle mechanism and a baffle, both arranged in a circular array at the bottom of the inner liner; a drive assembly and an oxygen supply assembly, both disposed at the bottom of the fermentation tank, wherein the oxygen supply assembly is used to input oxygen into the inner liner; The top of the fermenter is fixedly connected to an exhaust valve, and the bottom of the inner liner is fixedly connected to a bracket. The stirring paddle mechanism includes a support fixed to the bracket, a paddle blade connected to the bearing inside the support, and the blade portion of the paddle blade extends into the inner liner. A lever is fixed to the shaft portion of the paddle blade, and the shaft portion of the paddle blade is also connected to the bottom of the inner liner via a spring. The paddle blade can abut against both ends of the stop after rotating around its own axis by ±60 degrees. The drive assembly can be used to drive the inner liner and the stirring paddle mechanism to rotate forward or backward around the axis of the inner liner.

[0007] Preferably, the drive assembly can drive the inner liner to rotate via a stirring paddle mechanism; The drive assembly includes a gear motor fixed to the bottom of the fermenter, a gear movably connected to the bracket, the output end of the gear motor meshing with the outer ring of the double-sided gear ring, and a gear meshing with the inner ring of the double-sided gear ring fixedly sleeved on the blade shaft. The drive assembly can drive the paddle to rotate the lever and abut against the stop, thereby driving the inner liner to rotate.

[0008] Preferably, the gear motor is a reversible DC motor.

[0009] Preferably, the oxygen supply component is connected to the bottom of the stirring paddle mechanism, and the oxygen supply component can pump oxygen into the inner liner through the stirring paddle mechanism.

[0010] Preferably, the oxygen supply assembly includes an annular chamber fixed to the bottom of the fermenter, an annular plate movably connected to the top of the annular chamber cavity, a pipe fixedly connected to the bottom of the annular chamber, and the other end of the pipe extending to the outside of the fermenter. A rigid pipe for connecting the support and the annular chamber is fixedly connected to the annular plate. The blade portion of the propeller has vertically spaced vent holes on both sides, which can be connected to the support through the blade.

[0011] Preferably, each of the exhaust holes is provided with a one-way valve that can communicate with the inner cavity of the inner liner in one direction.

[0012] Preferably, the stirring paddle mechanism is further provided with an adjustment component for adjusting the connection between the exhaust hole on one side of the paddle blade and the inner liner.

[0013] Preferably, the adjusting assembly includes a gear rod movably sleeved inside the blade, the bottom end of the gear rod extending to the bottom of the blade and fixedly connected to the support, and a plastic toothed plate movably connected inside the blade, meshing with the outer periphery of the gear rod, with partitions fixedly connected to both ends of the plastic toothed plate that can slide inside the blade. The blade is also provided with symmetrical and vertically equidistant through holes, and the blade cavity can be connected to the exhaust port through the through holes; In the initial state, the partition can isolate the connection between the through hole and the exhaust hole. When the blade rotates, it can cause the plastic tooth plate to move around the gear rod and connect the through hole on one side of the blade with the through hole.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The above solution uses a drive component to rotate the inner liner, causing the liquid bacteria inside the liner to rotate synchronously with it. Ten seconds before the fifth minute, the drive component begins to decelerate until it stops completely after the fifth minute. During the deceleration, the liquid inside the liner rotates around its axis due to inertia, while the mixed bacteria inside the tank impacts the paddle, causing it to rotate and reducing the impact area with the liquid bacteria, thus guiding the bacteria. At the same time, the spring on the paddle stores energy. When the inner liner stops completely, the paddle slowly resets due to its own elasticity and increases the contact area between the paddle and the bacteria as the mixed bacteria rotate, thereby improving mixing efficiency. This also solves the problem of mycelium being torn due to excessive rotation speed of the stirring paddle. The above solution works by having the gear rod fixed relative to the blade on the support when the blade rotates around the shaft. At this time, the plastic toothed plate and the partition plate are limited by the inner wall of the blade, which forces the plastic toothed plate to move around the gear rod. This allows the through hole on the side of the blade facing the impact of the liquid bacteria to connect with the exhaust hole. At this time, the gas pumped into the stirring paddle mechanism by the oxygen supply component will be discharged through the exhaust hole and form a gas membrane on the outside of the blade. This further reduces the impact between the liquid bacteria and the blade when rotating, and at the same time, it can pump oxygen into the inner tank to improve the dissolved oxygen efficiency of the bacteria. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the fermenter of the present invention; Figure 3 This is a perspective plan view of the inner liner of the present invention; Figure 4 This is a schematic diagram of the cooperation structure between the stirring paddle mechanism and the oxygen supply component of the present invention; Figure 5 This is a schematic diagram of the structure of the driving component of the present invention; Figure 6 This is a schematic diagram of the stirring paddle mechanism of the present invention; Figure 7 This is a schematic diagram of the oxygen supply assembly. Figure 8 This is a schematic diagram of the front cross-sectional structure of the present invention; Figure 9 for Figure 8 Enlarged view of point A in the middle; Figure 10 This is a top cross-sectional plan view of the blade of the present invention; Figure 11 for Figure 10 Enlarged view of point B in the middle.

[0016] In the diagram: 1. Fermentation tank; 11. Inner liner; 111. Support; 112. Baffle; 12. Exhaust valve; 13. Drain pipe; 2. Stirring mechanism; 21. Blade; 211. Exhaust port; 212. Through hole; 22. Support; 23. Lever; 3. Drive assembly; 31. Gear motor; 32. Double-sided gear ring; 33. Gear; 4. Adjustment assembly; 41. Gear rod; 42. Plastic gear plate; 43. Baffle; 5. Oxygen supply assembly; 51. Annular chamber; 52. Pipe; 53. Annular plate; 54. Rigid pipe. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 11 As shown, the present invention provides a liquid spawn mixing and fermentation device for mushroom cultivation, including a fermentation tank 1 and an inner liner 11 movably installed therein. An exhaust valve 12 is fixedly connected to the top of the fermentation tank 1, and a drain pipe 13 is fixedly installed at the bottom of the fermentation tank 1. The drain pipe 13 is movably sleeved inside the inner liner 11. The device also includes: a stirring paddle mechanism 2 and a baffle 112, both of which are arranged in a circular array at the bottom of the inner liner 11; a drive assembly 3 and an oxygen supply assembly 5, both of which are arranged at the bottom of the fermentation tank 1, wherein the oxygen supply assembly 5 is used to input oxygen into the inner liner 11. The top of the fermenter 1 is fixedly connected to an exhaust valve 12, and the bottom of the inner liner 11 is fixedly connected to a bracket 111. The stirring paddle mechanism 2 includes a support 22 fixed to the bracket 111. A bearing connects to the paddle 21 inside the support 22, and the blade portion of the paddle 21 extends into the inner liner 11. A lever 23 is fixed to the shaft portion of the paddle 21. The shaft portion of the paddle 21 is also connected to the bottom of the inner liner 11 via a spring. After the paddle 21 rotates around its own axis by ±60 degrees, it can abut against both ends of the stop 112. The drive assembly 3 can be used to drive the inner liner 11 and the stirring paddle mechanism 2 to rotate forward or backward around the axis of the inner liner 11. The oxygen supply component 5 is connected to the bottom of the stirring mechanism 2, and the oxygen supply component 5 can pump oxygen into the inner liner 11 through the stirring mechanism 2.

[0019] Using the above scheme, the inner liner 11 is rotated by the drive component 3, causing the liquid bacteria inside the inner liner 11 to rotate synchronously with the inner liner 11. Ten seconds before the fifth minute, the drive component 3 starts to decelerate until it stops completely after the fifth minute. During the deceleration process, the liquid inside the inner liner 11 will rotate around the axis of the inner liner 11 due to inertia, while the mixed bacteria inside the tank will also impact the paddle 21, causing it to rotate to reduce the impact area with the liquid bacteria and guide the bacteria. At the same time, the spring on the paddle 21 will store power. When the inner liner 11 stops completely, the paddle 21 will slowly reset due to its own elasticity and increase the contact area between the paddle 21 and the bacteria as the rotation speed of the mixed bacteria inside the inner liner 11 increases. Then the drive component 3 is reversed and the above operation is repeated to improve the mixing efficiency. At the same time, the problem of the mycelium being torn due to excessive rotation speed of the stirring paddle is solved. It is worth noting that drive component 3 needs to run for twenty minutes every hour, and each time drive component 3 needs to run alternately for five minutes in both directions; At the same time, when the drive component 3 is running, the oxygen supply component 5 will also pump oxygen into the inner liner 11, and the generated exhaust gas will be discharged through the exhaust valve 12.

[0020] like Figures 2-5 and Figure 8 As shown, the drive assembly 3 can drive the inner liner 11 to rotate through the stirring paddle mechanism 2; the drive assembly 3 includes a gear motor 31 fixed to the bottom of the fermentation tank 1, a gear 33 movably connected to the bracket 111, the output end of the gear motor 31 meshing with the outer ring of the double-sided gear ring 32, and a gear 33 meshing with the inner ring of the double-sided gear ring 32 is fixedly sleeved on the shaft of the paddle 21. The drive assembly 3 can drive the blade 21 to rotate the lever 23 and abut against the stop 112, thereby driving the inner liner 11 to rotate; the gear motor 31 is a forward and reverse DC motor. Using the above scheme, the operation of the gear motor 31 will cause the blade 21 to rotate through the double-sided gear ring 32 and gear 33. When the blade 21 drives the lever 23 to abut against the exhaust valve 12, the gear 33 cannot rotate. The continued rotation of the double-sided gear ring 32 will drive the inner liner 11 and the liquid bacteria inside to rotate through the gear 33, blade 21, lever 23 and stop 112. When the gear motor 31 decelerates to stop, the liquid bacteria in the inner liner 11 will continue to rotate due to inertia. At this time, the blade 21 will slowly return to its original position due to its own elasticity. As the rotation speed of the mixed bacteria in the inner liner 11 increases, the contact area between the blade 21 and the bacteria will increase, thereby improving the mixing efficiency. It is worth noting that since the gear motor 31 is a DC motor, when the gear motor 31 stops running, the rotation of the liquid and bacteria in the inner liner 11 may reverse and drive the drive component 3 to rotate. At this time, the resistance given to the spring on the blade 21 by the gear motor 31 and the double-sided gear ring 32 is less than the elastic force of the spring, thereby ensuring that the blade 21 can be reset by the elastic force.

[0021] like Figure 2 , Figure 3 and Figures 7-9 As shown, the oxygen supply assembly 5 includes an annular chamber 51 fixed to the bottom of the fermenter 1. An annular plate 53 is movably connected to the top of the cavity of the annular chamber 51. A pipe 52 is fixedly connected to the bottom of the annular chamber 51, and the other end of the pipe 52 extends to the outside of the fermenter 1. A rigid pipe 54 for connecting the support 22 and the annular chamber 51 is fixedly connected to the annular plate 53. Exhaust holes 211 are vertically and equidistantly opened on both sides of the blade portion of the blade 21. The exhaust holes 211 can be connected to the support 22 through the blade 21. Each vent 211 is equipped with a one-way valve that can communicate with the inner cavity of the inner liner 11 in one direction. Using the above scheme, when the inner liner 11 drives the stirring paddle mechanism 2 to rotate, the rigid tube 54 and the annular plate 53 will rotate synchronously with the stirring paddle mechanism 2 to ensure that oxygen can be continuously supplied to the inner liner 11. The one-way valve installed in the vent 211 can prevent liquid bacteria and liquid in the inner liner 11 from entering the blade 21.

[0022] like Figure 6 and Figures 8-11 As shown, the stirring paddle mechanism 2 is also provided with an adjustment component 4 for adjusting the connection between the exhaust hole 211 on one side of the paddle 21 and the inner liner 11. The adjustment assembly 4 includes a gear rod 41 movably sleeved inside the blade 21. The bottom end of the gear rod 41 extends to the bottom of the blade 21 and is fixedly connected to the support 22. A plastic toothed plate 42 that meshes with the outer periphery of the gear rod 41 is also movably connected inside the blade 21. Both ends of the plastic toothed plate 42 are fixedly connected to a partition plate 43 that can slide inside the blade 21. The blade 21 is also provided with symmetrical and vertically equidistant through holes 212, and the blade 21 cavity can be connected to the exhaust hole 211 through the through holes 212. In the initial state, the partition 43 can isolate the connection between the through hole 212 and the exhaust hole 211. When the blade 21 rotates, it can make the plastic tooth plate 42 move around the gear rod 41 and make the through hole 212 on one side of the blade 21 connect with the through hole 212.

[0023] Using the above scheme, when the blade 21 rotates around the shaft, since the gear rod 41 is fixed relative to the blade 21 on the support 111, the plastic toothed plate 42 and the partition plate 43 are limited by the inner wall of the blade 21, which will force the plastic toothed plate 42 to move around the gear rod 41, so that the through hole 212 on the side of the blade 21 facing the impact of the liquid bacteria is connected to the exhaust hole 211. At this time, the gas pumped into the stirring paddle mechanism 2 by the oxygen supply component 5 will be discharged through the exhaust hole 211 and form a gas diaphragm on the outside of the blade 21, which further reduces the impact between the liquid bacteria and the blade 21 when rotating, and can also pump oxygen into the inner liner 11 to improve the dissolved oxygen efficiency of the bacteria.

[0024] Working principle and usage process of this invention: First, the operator runs the drive assembly 3 to drive the inner liner 11 to rotate. The liquid bacteria inside the inner liner 11 will rotate synchronously with the inner liner 11. The drive assembly 3 starts to decelerate in the first ten seconds of the fifth minute and stops completely after the fifth minute. During the deceleration, the liquid inside the inner liner 11 will rotate around the axis of the inner liner 11 due to inertia. The mixed bacteria inside the tank will also impact the paddle 21 to make it rotate, thereby reducing the impact area with the liquid bacteria and guiding the bacteria. At the same time, the spring on the paddle 21 will also store power. When the inner liner 11 stops completely, the paddle 21 will slowly reset due to its own elasticity and increase the contact area between the paddle 21 and the bacteria as the rotation speed of the mixed bacteria inside the inner liner 11 increases. Then the drive assembly 3 is run in reverse and the above operation is repeated to improve the mixing efficiency. When the gear motor 31 is running, it will cause the blade 21 to rotate through the double-sided gear ring 32 and gear 33. When the blade 21 drives the lever 23 to abut against the exhaust valve 12, the gear 33 cannot rotate. The continued rotation of the double-sided gear ring 32 will drive the inner liner 11 and the liquid bacteria inside to rotate through the gear 33, blade 21, lever 23 and stop 112. When the gear motor 31 decelerates to stop, the liquid bacteria in the inner liner 11 will continue to rotate due to inertia. At this time, the blade 21 will slowly return to its original position due to its own elasticity. As the rotation speed of the mixed bacteria in the inner liner 11 increases, the contact area between the blade 21 and the bacteria will increase to improve the mixing efficiency. When the blade 21 rotates around the shaft, the gear rod 41 is fixed relative to the blade 21 on the support 111. At this time, the plastic toothed plate 42 and the partition plate 43 are limited by the inner wall of the blade 21, which will force the plastic toothed plate 42 to move around the gear rod 41. This will cause the through hole 212 on the side of the blade 21 facing the impact of the liquid bacteria to connect with the exhaust hole 211. At this time, the gas pumped into the stirring paddle mechanism 2 by the oxygen supply component 5 will be discharged through the exhaust hole 211 and form a horizontal gas string on the outside of the blade 21. Several gas strings in the vertical direction will be impacted by the liquid bacteria and adhere to one side of the blade 21. The bubbles will also rise due to buoyancy. Therefore, several gas strings will form a gas net on one side of the blade 21, which will further reduce the impact between the liquid bacteria and the blade 21 when rotating. At the same time, oxygen can be pumped into the inner liner 11 to improve the dissolved oxygen efficiency of the bacteria.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid spawn mixing and fermentation device for mushroom cultivation, comprising a fermentation tank (1) and an inner liner (11) movably installed therein, wherein an exhaust valve (12) is fixedly connected to the top of the fermentation tank (1), and a drain pipe (13) is fixedly installed at the bottom of the fermentation tank (1), the drain pipe (13) being movably sleeved within the inner liner (11), characterized in that, Also include: The stirring paddle mechanism (2) and the blocking piece (112) are arranged in an annular array at the bottom of the inner container (11); The driving assembly (3) and the oxygen supply assembly (5) are arranged at the bottom of the fermentation tank (1), wherein the oxygen supply assembly (5) is used for inputting oxygen into the inner container (11); The top of the fermentation tank (1) is fixedly connected with an exhaust valve (12), and the bottom of the inner container (11) is fixedly connected with a support (111); The stirring paddle mechanism (2) includes a support (22) fixedly connected to the support (111), the support (22) is connected with a paddle (21) through a bearing, the blade part of the paddle (21) extends into the inner container (11), a shaft body part of the paddle (21) is fixedly connected with a lever (23), and the shaft body part of the paddle (21) is connected with the bottom of the inner container (11) through a spring, the paddle (21) can abut against both ends of the blocking piece (112) after rotating 60 degrees in positive and negative directions around the shaft. The driving assembly (3) can drive the inner container (11) and the stirring paddle mechanism (2) to rotate in positive or negative directions around the shaft of the inner container (11).

2. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 1, characterized in that: The driving assembly (3) can drive the inner container (11) to rotate through the stirring paddle mechanism (2); The driving assembly (3) includes a gear motor (31) fixedly connected to the bottom of the fermentation tank (1), a gear (33) movably connected to the support (111), an output end of the gear motor (31) engaged with an outer ring of a double-sided gear ring (32), and a gear (33) fixedly sleeved on the shaft body of the paddle (21) and engaged with an inner ring of the double-sided gear ring (32). The driving assembly (3) can drive the paddle (21) to rotate and abut against the blocking piece (112), so as to drive the inner container (11) to rotate.

3. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 2, characterized in that: The motor of the gear motor (31) is a direct current motor capable of rotating in positive and negative directions.

4. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 1, characterized in that: The oxygen supply assembly (5) is communicated with the bottom of the stirring paddle mechanism (2), and the oxygen supply assembly (5) can pump oxygen into the inner container (11) through the stirring paddle mechanism (2).

5. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 4, characterized in that: The oxygen supply assembly (5) includes an annular bin (51) fixedly connected to the bottom of the fermentation tank (1), an annular plate (53) movably connected to the top of the cavity of the annular bin (51), a pipeline (52) fixedly connected to the bottom of the annular bin (51) and extending to the outside of the fermentation tank (1), and a hard pipe (54) fixedly connected to the annular plate (53) and used for communicating the support (22) and the annular bin (51); Exhaust holes (211) are vertically and equidistantly arranged on both sides of the blade part of the paddle (21), and the exhaust holes (211) are communicated with the support (22) through the paddle (21).

6. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 5, characterized in that: A one-way valve flap capable of being communicated with the inner cavity of the inner container (11) in one direction is arranged in each exhaust hole (211).

7. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 5, characterized in that: An adjusting assembly (4) for adjusting the communication between one of the exhaust holes (211) of the paddle (21) and the inner container (11) is further arranged in the stirring paddle mechanism (2).

8. The liquid spawn mixing and fermentation device for mushroom cultivation according to claim 7, characterized in that: The adjusting assembly (4) comprises a gear rod (41) movably sleeved in the paddle (21), the bottom end of the gear rod (41) extends to below the paddle (21) and is fixedly connected with the support (22), and the paddle (21) further movably connects a plastic tooth plate (42) engaged with the outer periphery of the gear rod (41), and both ends of the plastic tooth plate (42) are fixedly connected with a partition plate (43) capable of sliding in the paddle (21); The paddle (21) further symmetrically and vertically equidistantly has a through hole (212), and the cavity of the paddle (21) can communicate with the exhaust hole (211) through the through hole (212); In the initial state, the partition plate (43) can isolate the communication between the through hole (212) and the exhaust hole (211), and when the paddle (21) rotates, the plastic tooth plate (42) can move around the gear rod (41), and the through hole (212) on one side of the paddle (21) can communicate with the through hole (212).

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