Treatment system for high-concentration organic wastewater

Abstract

The utility model provides a high-concentration organic wastewater treatment system which comprises a conditioning tank, a preheating tank and a reaction tank, and the conditioning tank is provided with a dosing port; the preheating tank is connected with the tempering tank through a first water distribution pipe, a chemical inlet ring pipe is arranged in the preheating tank, and a first stirring piece is rotationally connected in the preheating tank; the reaction tank is connected to the water outlet side of the preheating tank, a plurality of groups of catalysis cylinders are arranged in the reaction tank, a second stirring piece is rotationally connected in the reaction tank, the second stirring piece is provided with an air guide inner cavity, and an aeration nozzle is arranged on the second stirring piece. According to the high-concentration organic wastewater treatment system provided by the utility model, under the stirring action of the first stirring piece, an oxidizing agent can be fully mixed with wastewater in the preheating tank, so that the uniformity of the content of the oxidizing agent in the wastewater is ensured; the compressed gas enters the reaction tank through the gas guide inner cavity of the second stirring part and the aeration nozzle to form uniformly distributed tiny bubbles, so that the aeration and oxygenation effect is improved, and the catalytic oxidation treatment effect on the wastewater is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater treatment technical field, concretely relates to a kind of treatment system of high concentration organic wastewater. BACKGROUND

[0002] In the industrial production of medicine, chemical industry, pesticide and coking, a large amount of high concentration organic wastewater will be produced, and it is difficult to reach the discharge standard by using conventional biochemical treatment system. The most commonly used method for treating high concentration organic wastewater is catalytic oxidation method, which is based on the principle of using multiple types of oxidants as initiators under the participation of special catalysts and generating hydroxyl radicals under certain temperature and pressure conditions to oxidize and decompose organic matter in wastewater.

[0003] In the prior art, the oxidant is first added to the wastewater, and then the wastewater is heated to a set temperature and introduced into the reactor with catalyst for catalytic oxidation treatment. Oxygen is introduced into the reactor by aeration to improve the reaction efficiency of catalytic oxidation. However, when the oxidant is added to the wastewater, there is a problem of uneven mixing, which leads to different decomposition degrees of wastewater in different areas under the same temperature and pressure conditions. In addition, there is a problem of uneven aeration in the reactor, which causes a part of the wastewater not to be treated by aeration, thereby affecting the final treatment effect of the wastewater. SUMMARY

[0004] The utility model embodiment provides a kind of treatment system of high concentration organic wastewater, can ensure the uniformity of oxidant content in wastewater, simultaneously can improve the effect of aeration oxygenation, improve the catalytic oxidation treatment effect of wastewater.

[0005] To achieve the above object, the utility model adopts the technical scheme of: providing a kind of treatment system of high concentration organic wastewater, including conditioning tank, preheating tank and reaction tank, conditioning tank is equipped with the dosing port for adding pH regulator;Preheating tank is connected with conditioning tank by first water distribution pipe, preheating tank is equipped with medicine inlet ring pipe, medicine inlet ring pipe is used to add oxidant to preheating tank, first stirring member is rotatably connected in preheating tank and extends to below medicine inlet ring pipe;Reaction tank is connected to the water outlet side of preheating tank, and a plurality of groups of catalytic cartridges for accommodating catalysts are arranged along the axial direction of the reaction tank in the reaction tank, and a second stirring member is rotatably connected in the reaction tank, the second stirring member has a gas guide inner cavity for air flow, and a plurality of aeration nozzles are arranged on the peripheral wall of the second stirring member and communicated with the gas guide inner cavity, the aeration nozzles are used to blow air into the reaction tank.

[0006] As another embodiment of the utility model, each group of catalytic cartridges includes a plurality of catalytic cartridges arranged along the circumferential direction of the reaction tank, and the central axis of the catalytic cartridges extends along the radial direction of the reaction tank.

[0007] As another embodiment of the utility model, the circumferential wall of the catalytic cylinder is provided with a plurality of communication holes, and the outer end of the catalytic cylinder penetrates through the circumferential wall of the reaction tank and is connected to the outer circumferential wall of the reaction tank through a flange.

[0008] As another embodiment of the utility model, the second stirring member comprises a second stirring shaft penetrating through the top wall of the reaction tank and being rotationally connected to the reaction tank, and a plurality of stirring rods connected to the outer periphery of the second stirring shaft, the plurality of stirring rods are correspondingly arranged below the plurality of catalytic cylinders, the air sparger is connected to the circumferential wall of the stirring rod, and the upper end of the second stirring shaft is connected to an air compressor for supplying air to the air guide cavity.

[0009] As another embodiment of the utility model, the central axis of the stirring rod extends along the radial direction of the second stirring shaft, each group of stirring rods comprises a plurality of stirring rods arranged along the circumferential direction of the second stirring shaft, and the air sparger is uniformly arranged on the circumferential wall of the stirring rod.

[0010] As another embodiment of the utility model, the reaction tank is connected to the preheating tank through a second water distribution pipe, and a heater located outside the reaction tank is connected to the second water distribution pipe.

[0011] As another embodiment of the utility model, the lower part of the reaction tank is connected to a first drain pipe, the water outlet end of the first drain pipe is connected to the upper end of the first stirring member, the first stirring member has a flow guide cavity in communication with the first drain pipe, and the lower end of the first stirring member is connected to a second drain pipe located below the preheating tank.

[0012] As another embodiment of the utility model, the first stirring member comprises a first stirring shaft penetrating through the top wall of the preheating tank and being rotationally connected to the preheating tank, and a plurality of stirring bends connected to the outer periphery of the first stirring shaft, the upper and lower ends of the stirring bend are respectively connected to the circumferential wall of the first stirring shaft, the plurality of stirring bends are arranged along the circumferential direction of the first stirring shaft, the first drain pipe is connected to the upper end of the first stirring shaft, and the second drain pipe is connected to the lower end of the first stirring shaft.

[0013] As another embodiment of the utility model, a helical blade is wound on the outer circumferential wall of the stirring bend.

[0014] As another embodiment of the utility model, the first stirring shaft and the second stirring shaft are respectively rotationally connected to the preheating tank or the reaction tank through a driving assembly, the driving assembly comprises a driving motor, a driving gear and a driven gear, the driving motor is connected to the top of the preheating tank or the reaction tank, the output end of the driving motor is connected to a driving shaft extending downward, the driving shaft is rotationally connected to the preheating tank or the reaction tank; the driving gear is sleeved on the outer periphery of the driving shaft; the driven gear is sleeved on the outer periphery of the first stirring shaft or the second stirring shaft and is engaged with the driving gear.

[0015] The processing system of high-concentration organic wastewater has the advantages that, compared with the prior art, wastewater treated by the conditioning tank enters the preheating tank through the first water distribution pipe, and the oxidizing agent is uniformly sprayed into the preheating tank through the medicine inlet ring pipe, and under the stirring action of the first stirring part, the oxidizing agent can be fully mixed with the wastewater in the preheating tank, so that the uniformity of the oxidizing agent content in the wastewater is ensured; the wastewater fully mixed with the oxidizing agent enters the reaction tank, and at the same time, the compressed gas enters the reaction tank through the gas guide inner cavity of the second stirring part and the aeration nozzle, and since the second stirring part can drive the aeration nozzle to rotate in the reaction tank, the gas supplied by the aeration nozzle forms uniformly distributed micro-bubbles in the wastewater, the effect of aeration and oxygenation is improved, and the catalytic oxidation treatment effect of the wastewater is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A structure schematic view of the processing system of high-concentration organic wastewater provided by the present application embodiment is provided.

[0018] Figure 2 A structure schematic view of the second stirring part provided by the present application embodiment is provided.

[0019] Figure 3 A structure schematic view of the first stirring part provided by the present application embodiment is provided.

[0020] In the drawings, various reference signs represent:

[0021] 1, conditioning tank; 11, medicine inlet; 2, preheating tank; 21, first water distribution pipe; 22, medicine inlet ring pipe; 23, first stirring part; 231, first stirring shaft; 232, stirring elbow; 233, spiral blade; 24, second drain pipe; 3, reaction tank; 31, catalytic cylinder; 311, communication hole; 312, flange; 32, second stirring part; 321, second stirring shaft; 322, stirring rod; 33, aeration nozzle; 34, second water distribution pipe; 35, first drain pipe; 4, air compressor; 5, heater; 6, driving assembly; 61, driving motor; 611, driving shaft; 62, driving gear; 63, driven gear. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0023] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or several features. In the description of the present application, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly specified.

[0024] Please refer to Figures 1 to 3 , a high-concentration organic wastewater treatment system provided by the utility model will be described. The high-concentration organic wastewater treatment system comprises a conditioning tank 1, a preheating tank 2 and a reaction tank 3, the conditioning tank 1 is provided with a dosing opening 11 for adding a pH regulator; the preheating tank 2 is connected with the conditioning tank 1 through a first water distribution pipe 21, the preheating tank 2 is provided with a medicine inlet ring pipe 22, the medicine inlet ring pipe 22 is used for adding an oxidizing agent into the preheating tank 2, the preheating tank 2 is rotatably connected with a first stirring piece 23 extending to below the medicine inlet ring pipe 22; the reaction tank 3 is connected to the water outlet side of the preheating tank 2, the reaction tank 3 is provided with a plurality of groups of catalyst cylinders 31 for accommodating catalysts and arranged along the axial direction of the reaction tank 3, the reaction tank 3 is rotatably connected with a second stirring piece 32, the second stirring piece 32 has a gas guide inner cavity for air circulation, a plurality of air blow nozzles 33 are arranged on the peripheral wall of the second stirring piece 32 and communicated with the gas guide inner cavity, and the air blow nozzles 33 are used for blowing air into the reaction tank 3.

[0025] Compared with the prior art, the wastewater treated by the conditioning tank 1 enters the preheating tank 2 through the first water distribution pipe 21, at the same time, the oxidizing agent is uniformly sprayed into the preheating tank 2 through the medicine inlet ring pipe 22, and under the stirring action of the first stirring part 23, the oxidizing agent can be fully mixed with the wastewater in the preheating tank 2, so that the uniformity of the oxidizing agent content in the wastewater is ensured; the wastewater fully mixed with the oxidizing agent enters the reaction tank 3, at the same time, the compressed gas enters the reaction tank 3 through the gas guide inner cavity of the second stirring part 32 and the aeration nozzle 33, since the second stirring part 32 can drive the aeration nozzle 33 to rotate in the reaction tank 3, the gas supplied by the aeration nozzle 33 forms uniformly distributed micro-bubbles in the wastewater, the effect of aeration and oxygenation is improved, and the catalytic oxidation treatment effect of the wastewater is further improved.

[0026] In the embodiment, the conditioning tank 1 is connected with a pH detector, the pH detector is used for detecting the pH value of the wastewater in the conditioning tank 1, so as to determine the adding amount of the pH regulator, generally, the pH value of the wastewater in the conditioning tank 1 needs to be less than or equal to 2.5, so as to ensure that the oxidizing agent added in the preheating tank 2 can stably exist in the acidic environment of the wastewater. The oxidizing agent is selected from any one or a combination of multiple of hydrogen peroxide, peroxyacetic acid, calcium peroxide and magnesium peroxide. The catalyst in the catalytic cylinder 31 is a heterogeneous catalyst, which comprises a carrier and an active component loaded on the carrier, the carrier is at least one element or a compound thereof selected from iron, silicon, aluminum and zirconium, and the active component is at least one element or a compound thereof selected from manganese, gold, platinum and ruthenium.

[0027] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1 Each group of catalytic cylinders 31 comprises a plurality of catalytic cylinders 31 arranged at a circumferential interval along the reaction tank 3, and the central axis of the catalytic cylinder 31 extends along the radial direction of the reaction tank 3.

[0028] In the embodiment, the arrangement mode of the plurality of catalytic cylinders 31 increases the contact area between the catalyst and the wastewater, which is helpful to improve the catalytic effect on the wastewater, in addition, the central axis of the catalytic cylinder 31 extends along the radial direction of the reaction tank 3, but the inner ends of each group of catalytic cylinders 31 are spaced apart by a certain distance to avoid the arrangement of the second stirring part 32 and avoid positional interference.

[0029] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1 The circumferential wall of the catalytic cylinder 31 is provided with a plurality of communication holes 311, and the outer end of the catalytic cylinder 31 penetrates the circumferential wall of the reaction tank 3 and is connected to the outer circumferential wall of the reaction tank 3 through the flange 312.

[0030] In the embodiment, the wastewater in the reaction tank 3 enters the inside of the catalytic cylinder 31 through the communication hole 311, contacts the surface of the catalyst, and catalytic reaction occurs.

[0031] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1 and Figure 2 The second stirring part 32 comprises a second stirring shaft 321 arranged through the top wall of the reaction tank 3 and rotationally matched with the reaction tank 3 and a plurality of groups of stirring rods 322 connected to the outer periphery of the second stirring shaft 321, the plurality of groups of stirring rods 322 are correspondingly located below the plurality of groups of catalytic cylinders 31, the aeration nozzles 33 are connected to the peripheral wall of the stirring rods 322, and the upper end of the second stirring shaft 321 is connected with an air compressor 4 for supplying air to the air guide cavity.

[0032] In the embodiment, the upper end of the second stirring shaft 321 is connected with the air compressor 4 through a rotary joint, compressed air can be supplied to the air guide cavity during the rotation of the second stirring shaft 321, and the compressed air enters the wastewater in the reaction tank 3 through the rotating aeration nozzles 33, so that the distribution is more uniform.

[0033] The stirring rods 322 are correspondingly located below the catalytic cylinders 31, can increase oxygen in a close range when the wastewater contacts and reacts with the catalyst, improve the oxygen utilization rate, and thus promote the efficiency of the catalytic oxidation of the wastewater,

[0034] A pressure gauge is arranged on the reaction tank 3 to monitor the pressure in the reaction tank 3 in real time.

[0035] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1 and Figure 2 The central axis of the stirring rod 322 extends along the radial direction of the second stirring shaft 321, each group of stirring rods 322 comprises a plurality of stirring rods 322 arranged at intervals along the circumferential direction of the second stirring shaft 321, and the aeration nozzles 33 are uniformly arranged on the peripheral wall of the stirring rods 322.

[0036] In the embodiment, the central axis of the stirring rod 322 is parallel to the central axis of the catalytic cylinder 31, the catalytic cylinders 31 and the stirring rods 322 are staggered in the axial direction of the reaction tank 3, oxygen is supplied through the stirring rods 322 at the same time, and the stirring rods 322 also play a role in stirring the wastewater, so that the wastewater and the catalyst can fully contact and react in a sufficient oxygen atmosphere.

[0037] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1The reaction tank 3 is connected with the preheating tank 2 through a second water distribution pipe 34, and a heater 5 is connected outside the reaction tank 3 on the second water distribution pipe 34.

[0038] In the embodiment, the wastewater flowing into the reaction tank 3 is heated to above 160 DEG C by the heater 5 to reach the temperature condition required by the catalytic oxidation reaction.

[0039] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1 The lower part of the reaction tank 3 is connected with a first drainage pipe 35, and the water outlet end of the first drainage pipe 35 is connected with the upper end of the first stirring piece 23.

[0040] In the embodiment, the treated wastewater produced after the catalytic oxidation reaction still has a high temperature, therefore, the first drainage pipe 35 is connected with the first stirring piece 23 in the preheating tank 2, so that the high-temperature treated wastewater discharged from the first drainage pipe 35 enters the flow guide inner cavity of the first stirring piece 23, and then the wastewater in the preheating tank 2 is preheated and warmed up, so that the heat energy is fully utilized.

[0041] Specifically, the rotation of the first stirring piece 23 not only plays a stirring promoting role in the mixing of the oxidant and the wastewater, but also can make the heat exchange between the high-temperature treated wastewater in the flow guide inner cavity and the wastewater in the preheating tank 2 more uniform, so as to improve the preheating efficiency.

[0042] The reaction tank 3 and the preheating tank 2 are both provided with thermometers to monitor the wastewater temperature in real time.

[0043] As a specific embodiment of the high-concentration organic wastewater treatment system provided by the utility model, referring to Figure 1 and Figure 3The first stirring piece 23 comprises a first stirring shaft 231 penetrating through the top wall of the preheating tank 2 and being rotationally connected with the preheating tank 2, and a plurality of stirring elbows 232 connected with the outer periphery of the first stirring shaft 231, the upper and lower ends of the stirring elbow 232 are connected with the peripheral wall of the first stirring shaft 231 respectively, the plurality of stirring elbows 232 are arranged along the circumferential direction of the first stirring shaft 231, the first drain pipe 35 is connected with the upper end of the first stirring shaft 231, and the second drain pipe 24 is connected with the lower end of the first stirring shaft 231.

[0044] In the embodiment, the first drain pipe 35 and the first stirring shaft 231 are connected through a rotary joint, and the second drain pipe 24 and the first stirring shaft 231 are also connected through a rotary joint, so that the rotation of the first stirring piece 23 is not affected.

[0045] After heat exchange, the treated wastewater is also cooled, and can be discharged into a biochemical tank or other biochemical device for subsequent biochemical treatment.

[0046] As a specific embodiment of the high-concentration organic wastewater treatment system, referring to Figure 1 and Figure 3 The outer peripheral wall of the stirring elbow 232 is provided with a spiral blade 233.

[0047] In the embodiment, the spiral blade 233 not only further increases the heat exchange area, but also can increase the stirring effect of the first stirring piece 23 on the wastewater in the preheating tank 2, so as to promote the full mixing of the oxidant and the wastewater.

[0048] As a specific embodiment of the high-concentration organic wastewater treatment system, referring to Figure 1 The first stirring shaft 231 and the second stirring shaft 321 are rotationally connected with the preheating tank 2 or the reaction tank 3 through the driving assembly 6 respectively, the driving assembly 6 comprises a driving motor 61, a driving gear 62 and a driven gear 63, the driving motor 61 is connected with the top of the preheating tank 2 or the reaction tank 3, the output end of the driving motor 61 is connected with a driving shaft 611 extending downward, the driving shaft 611 is rotationally connected with the preheating tank 2 or the reaction tank 3; the driving gear 62 is sleeved on the outer periphery of the driving shaft 611; the driven gear 63 is sleeved on the outer periphery of the first stirring shaft 231 or the second stirring shaft 321 and is engaged with the driving gear 62.

[0049] In the embodiment, the top wall of the preheating tank 2 and the reaction tank 3 is provided with a mounting frame with a mounting cavity, the driving motor 61 is connected to the mounting frame, the driving shaft 611 is rotatably connected to the mounting frame, and the driving gear 62 and the driven gear 63 are located in the mounting cavity. The driving motor 61 drives the driving shaft 611 to rotate, and through the meshing of the driving gear 62 and the driven gear 63, the first stirring shaft 231 or the second stirring shaft 321 is driven to rotate.

[0050] The above merely describes the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A treatment system for high-concentration organic wastewater, characterized in that, include: The conditioning tank is equipped with a dosing port for adding pH adjusters; A preheating tank is connected to the conditioning tank via a first water distribution pipe. The preheating tank is equipped with a drug inlet ring pipe for adding oxidant to the preheating tank. A first stirring element extending below the drug inlet ring pipe is rotatably connected inside the preheating tank. A reaction tank is connected to the outlet side of the preheating tank. The reaction tank is equipped with several sets of catalyst cylinders arranged at intervals along the axial direction of the reaction tank for containing catalysts. A second stirring element is rotatably connected inside the reaction tank. The second stirring element has an air guiding cavity for air circulation. The peripheral wall of the second stirring element is provided with multiple aeration nozzles communicating with the air guiding cavity. The aeration nozzles are used to blow air into the reaction tank.

2. The high-concentration organic wastewater treatment system as described in claim 1, characterized in that, Each group of catalyst cartridges includes several catalyst cartridges arranged at intervals along the circumference of the reaction vessel, and the central axis of the catalyst cartridges extends radially along the reaction vessel.

3. The high-concentration organic wastewater treatment system as described in claim 2, characterized in that, The catalytic cylinder has several connecting holes on its peripheral wall. The outer end of the catalytic cylinder passes through the peripheral wall of the reaction vessel and is connected to the outer peripheral wall of the reaction vessel through a flange.

4. The high-concentration organic wastewater treatment system as described in claim 2, characterized in that, The second stirring component includes a second stirring shaft that is disposed through the top wall of the reaction vessel and rotates with the reaction vessel, and several sets of stirring rods connected to the outer periphery of the second stirring shaft. The several sets of stirring rods are located below several sets of catalytic cylinders. The aeration nozzle is connected to the peripheral wall of the stirring rod. An air compressor for supplying air to the gas guide cavity is connected to the upper end of the second stirring shaft.

5. The high-concentration organic wastewater treatment system as described in claim 4, characterized in that, The central axis of the stirring rod extends radially along the second stirring shaft. Each group of stirring rods includes several stirring rods arranged circumferentially along the second stirring shaft. The aeration nozzles are evenly distributed on the peripheral wall of the stirring rod.

6. The high-concentration organic wastewater treatment system as described in claim 5, characterized in that, The reaction vessel is connected to the preheating vessel via a second water distribution pipe, and a heater located outside the reaction vessel is connected to the second water distribution pipe.

7. The high-concentration organic wastewater treatment system as described in claim 6, characterized in that, The lower part of the reaction vessel is connected to a first drain pipe, the outlet end of the first drain pipe is connected to the upper end of the first agitator, the first agitator has a flow guiding cavity communicating with the first drain pipe, and the lower end of the first agitator is connected to a second drain pipe located below the preheating vessel.

8. The high-concentration organic wastewater treatment system as described in claim 7, characterized in that, The first stirring component includes a first stirring shaft that penetrates the top wall of the preheating tank and rotates with the preheating tank, and a plurality of stirring bends connected to the outer periphery of the first stirring shaft. The upper and lower ends of the stirring bends are respectively connected to the peripheral wall of the first stirring shaft. The plurality of stirring bends are arranged at intervals along the circumference of the first stirring shaft. The first drain pipe is connected to the upper end of the first stirring shaft, and the second drain pipe is connected to the lower end of the first stirring shaft.

9. The high-concentration organic wastewater treatment system as described in claim 8, characterized in that, Spiral blades are wound around the outer peripheral wall of the stirring bend.

10. The high-concentration organic wastewater treatment system as described in claim 8, characterized in that, The first stirring shaft and the second stirring shaft are respectively rotatably connected to the preheating tank or the reaction tank via a drive assembly, the drive assembly comprising: A drive motor is connected to the top of the preheating tank or the reaction tank. The output end of the drive motor is connected to a downwardly extending drive shaft, which is rotatably connected to the preheating tank or the reaction tank. A drive gear is sleeved on the outer periphery of the drive shaft; The driven gear is sleeved on the outer circumference of the first or second stirring shaft and meshes with the driving gear.

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