CN205886307U - There is not concentrated machine of harrow with formula of circling round annular channel - Google Patents

Abstract

The utility model relates to the field of concentration and clarification of coal slime water, in particular to a rakeless concentrator with a rotary annular channel. The utility model at least includes a concentrator body, and also includes a convoluted annular channel for constraining the upper layer of the pulp in the concentrator to make it reciprocate. The channels are connected to each other by connecting channels, and each group of annular channels includes an upper annular partition and a lower inclined settling plate; the overflow is discharged from the overflow weir, and the overflow weir includes an annular overflow weir and a composite overflow weir; the sedimentation particles enter The underflow discharge system is composed of an underflow collection bin, an underflow port and a corresponding underflow pump; the utility model also includes a feeding pipeline and a driving stirring mechanism, which is realized by using the residual power of the feeding pipeline to transport the pulp to drive the stirring mechanism to rotate. The pulp and chemicals are evenly mixed; this concentrator has the characteristics of low energy consumption, low maintenance, low chemical consumption, and no need for rakes.

Description

A rakeless thickener with a rotary annular channel

technical field

The utility model relates to the field of concentration and clarification of coal slime water, in particular to a rakeless concentrator with a rotary annular channel.

Background technique

The thickener is a device that uses the flocculation and sedimentation of solid particles in the slime water to complete the continuous concentration of the slime water. Its essence is composed of a pool for sludge water sedimentation and an underflow discharge system that collects sediment at the underflow outlet and discharges it. Its production process is continuous, the slime water is fed from the upper middle of the pool body, the clarified overflow water flows into the overflow tank from the periphery of the pool body, and the settled product (bottom flow) is pumped out from the bottom flow port at the cone bottom of the pool body . The traditional thickener, also known as the rake thickener, has a rake that concentrates and transports the sediment to the center; the rake thickener can be divided into two types: the central drive type and the peripheral drive type; from the structural characteristics It can be divided into two types: ordinary thickener and high-efficiency thickener. The high-efficiency thickener directly feeds the slime water into the concentrate layer in the middle and lower part of the thickener body, which shortens the distance for the slime to settle and helps the slime The sedimentation of the particles increases the resistance of the slime into the overflow and improves the settling effect, so it is called a high-efficiency thickener, such as Eimco (EimcO-BSP) high-efficiency thickener, domestic high-efficiency thickener, etc. Existing concentrators have done a lot of research on the transmission device and body structure, but there are few innovations in the design of the overflow weir. In addition, how to ensure that the chemical and slime water are fully mixed and the degree of turbulence in the concentrator body is small, how to ensure The thickener works stably, and it is a research hotspot in this field in recent years to prevent the rake frame of the thickener from being "pressed" by high-concentration materials.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art, and set up a rotary annular channel to constrain the upper layer of ore pulp in the thickener to make it do a rotary reciprocating motion in the thickener body, increase the time for the particles to stay in the thickener and improve the quality of the fine particles. The settlement probability of coal slime; at the same time, a composite overflow weir is also set up, and the clarified overflow liquid that has completely settled can be discharged through multiple overflow weirs, thereby reducing the horizontal flow velocity of the slurry in the thickener body and further increasing the settlement probability of coal slime and reduce the degree of turbulence in the body of the concentrator; the utility model also uses the energy of the ore pulp to drive the stirring mechanism to rotate to achieve uniform mixing of the medicament and the ore pulp. No need for rakes, completely solve the phenomenon of "pressing rakes", and the concentrator works stably.

In order to achieve the above object, the utility model adopts the following technical solutions:

A rakeless thickener with a rotary annular channel, at least including a thickener body, characterized in that: the device also includes a rotary annular channel for constraining the upper layer of pulp in the thickener to make it reciprocating, the rotary annular The channel takes the center of the thickener as the center and gradually expands from the inside to the outside. The innermost annular channel is located around the driving stirring mechanism, and the outermost annular channel is located around the composite overflow weir and close to the center of the thickener; the rotary The annular passage is composed of multiple sets of annular passages with gradually increasing diameters. Adjacent annular passages are connected to each other by connecting passages. Each set of annular passages includes an upper annular partition and a lower inclined settling plate. The annular partition and inclined settling plate pass through Connected in a fixed connection, the inclined settling plate is supported by the bracket and the side wall of the thickener body; multiple groups of pulp outlets are arranged on the annular partition of the outermost annular channel, and the outlets between adjacent pulp outlets The distance is the same; the equipment also includes an overflow weir for collecting and discharging the clarified overflow liquid, which includes an annular overflow weir, a composite overflow weir, an air-filled adjustable lifting baffle, an inclined settling plate, Overflow sump.

The overflow weir includes an annular overflow weir arranged around the body of the thickener and a composite overflow weir arranged annularly along the inside of the body, and the surrounding annular overflow weir and the composite overflow weir are connected through an overflow collection groove; The side of the composite overflow weir close to the center of the concentrator is provided with an inflatable adjustable lifting baffle, and the lower part of the composite overflow weir is provided with an inclined settling plate through a fixed connection, and the inclined settling plate is supported by the bracket and the side wall of the thickener body; The overflow weir at least includes one composite overflow weir, two composite overflow weirs, one inflation-adjusting buoyancy baffle and two inflation-adjustment buoyancy baffles.

The equipment also includes an underflow discharge system. The underflow discharge system is composed of an underflow collection bin, an underflow outlet and a corresponding underflow pump; the underflow collection bin is composed of a central underflow collection bin and two sides of the underflow collection bin. The underflow collection bin is conical. The upper part is opened in a rectangular shape, and the lower part is connected to the underflow port; the underflow port is composed of the central underflow port and the two sides of the underflow port, and the material discharged from the underflow port is transported by the corresponding underflow pump; the underflow pump is composed of the central underflow pump and the two sides of the underflow pump composition. The equipment also includes a hydraulic rake lifting device, the hydraulic rake lifting device and the driving motor are installed on the bridge frame, and the bridge frame is connected with the slewing support at the upper part of the thickener body; the hydraulic rake lifting device is connected with the rake frame through a hydraulic connecting rod.

The equipment also includes a driving stirring mechanism, which is suspended above the center of the liquid surface of the concentrator body. Arrange the rotating shaft with vertical axis coaxially. The lower part of the rotating shaft is coaxially equipped with a diversion stirring impeller, and the upper part of the rotating shaft is coaxially fixed to drive the turbine; the outer peripheral wall of the outer shell is arranged through the main Pipeline, the discharge direction of the main pipe points to the wheel blade of the driving turbine; this equipment also includes a reducer for the rotating shaft to reduce the speed.

A pressure gauge is provided on the main feeding pipe, and the main feeding pipe is connected to the pulp pipeline; the pulp pipeline is connected to the chemical pipeline, and the connection point between the chemical pipeline and the pulp pipeline is located at the horizontal branch of the pulp pipeline. section, the chemical pipeline is inserted into the depth of the axis of the horizontal segment of the slurry pipeline, and the direction of the chemical outlet is opposite to the direction of the slurry; the vertical section of the slurry pipeline is provided with a pipeline mixer. The setting point is located behind the dosing point; the device also includes a bridge, which is connected with the outer casing of the driving stirring mechanism.

The beneficial effects of the utility model are:

1) On the basis of the traditional high-efficiency thickener, the utility model creatively designs a rotary annular channel on the upper layer of the thickener body, constrains the upper layer of the thickener to make it do reciprocating motion, and increases the particle stay in the thickener time and increase the settlement probability of fine-grained coal slime; the convoluted annular channel is composed of multiple groups of annular channels with gradually increasing diameters, and the adjacent annular channels are connected to each other by connecting channels. Each group of annular channels includes the upper annular partition and The lower inclined settling plate; the slurry reciprocates along the annular channel between the two partitions, and gradually flows from the connecting channel between the adjacent annular channels from the inner annular channel to the outer annular channel. The residence time increases, which increases the sedimentation effect of particles, especially fine particles; in order to allow the slurry to flow uniformly from the full section of the thickener to the overflow weir, multiple groups of slurry are arranged on the annular partition of the outermost annular channel The distance between the outlets of the adjacent slurry outlets is equal; the inclined settling plate is fixedly arranged under the annular partition, and the inclined settling plate is installed at a certain angle of inclination, so that the sedimentation area increases and the particle settlement distance Shortening, when the slurry reciprocates in the annular channel, the particles settle on the inclined settling plate and enter the underflow; the inclined settling plate is supported by the bracket and the side wall of the thickener body to ensure the stability of the entire rotary annular channel.

2) Composite overflow weir, the rising overflow water between the composite overflow weir and the driving stirring mechanism in the center is discharged from the composite overflow weir; the composite overflow weir also includes an inflatable adjustable lifting baffle for flexible adjustment of the composite overflow The treatment capacity of the flow weir, when the clarity of the overflow water is high, the air pressure in the lifting baffle can be lowered to adjust the air pressure in the floating baffle, and the overflow discharge can be increased. The air pressure of the thickener reduces the discharge of the overflow; setting the composite overflow weir can discharge the clarified overflow water that meets the requirements from the concentrator in time, reducing the movement speed of the horizontal flow in the concentrator body, and the feeding slurry moves from the feeding position to the overflow weir It takes longer time, and the particles in the slurry have a longer time to settle into the bottom flow; the inclined settling plate is fixedly installed at the lower part of the composite overflow weir, and the inclined settling plate is installed at a certain inclination angle, and the sedimentation area increases. Larger, the particle settlement distance is shortened, and the final clarification and settlement treatment is done for the rising overflow water to ensure the clarity of the overflow water; the joint operation of the surrounding ring overflow weir and the composite overflow weir has the advantages of improving the treatment efficiency of the thickener and the clarity of the overflow water Effect.

3), the underflow discharge system, the underflow discharge system is composed of the underflow collection bin, the underflow outlet and the corresponding underflow pump; the underflow collection bin is composed of the central underflow collection bin and the underflow collection bins on both sides. The wall inclination angle of each group of underflow collection bins is large, which is conducive to the rapid accumulation of sediments to the underflow outlet; the underflow collection bins are conical, and the upper opening is rectangular, forming a large cross-sectional area, which is conducive to the sediment falling directly to the underflow collection The lower part of the underflow collection chamber is connected to the underflow port, and each group of underflow collection chambers has a corresponding underflow port and underflow pump, which facilitates the rapid delivery of materials out of the thickener; the design of the underflow discharge system ensures that the thickener is normal and efficient without rakes run.

4) Drive the stirring mechanism, using the unique jet-driven agitator as the stirring mechanism, use the driving force of the pulp feeding main pipeline to drive the driving turbine on the rotating shaft to rotate, and then drive the rotating shaft and the diversion stirring impeller at the lower end of the rotating shaft to rotate, and the pulp Under the joint action of the driving turbine and the diversion stirring impeller, the chemical is mixed evenly. This design converts the energy in the process of pulp transportation into the mechanical energy of chemical mixing and stirring, which not only realizes the dispersion and mixing of the chemical, but also reduces energy consumption. It has the characteristics of low maintenance and low chemical consumption; at the same time, it consumes the excess kinetic energy of the pulp and reduces the impact of feeding on the steady flow field of the concentrator body; in addition, the rotating shaft is connected to the reducer to ensure that the driving and stirring structure is in line with chemical mixing. When stirring is required, operate at a low speed to reduce the impact on the steady flow field of the concentrator body. The role of the bell mouth design of the outer shell is to gradually guide the horizontal movement of the slurry into a vertical movement, and the working area is located under the circular channel, which provides good working conditions for the subsequent settlement and clarification.

5) Pipeline. There is a pressure gauge on the main feeding pipe, which can reflect the change of the bed layer in the concentrator to a certain extent. When the pressure gradually increases, it means that the concentration of the concentrate layer is increasing; the pressure main pipe Connect the slurry pipeline; the slurry pipeline is connected with the chemical pipeline, the connection point is located in the horizontal section of the slurry pipeline, the chemical pipeline is inserted into the depth of the horizontal segment axis of the slurry pipeline, and the direction of the chemical outlet is opposite to the direction of the slurry, which is beneficial Mixing of chemicals and pulp; In order to further realize the mixing of chemicals, a pipeline mixer is installed on the vertical section of the pulp pipeline behind the dosing point.

Description of drawings

Fig. 1 is the front schematic view of the utility model;

Fig. 2 is a partially enlarged view of part I of Fig. 1;

Fig. 3 is in the structure of Fig. 1, the schematic diagram of the position and structure of the rotary annular passage and the overflow weir;

Fig. 4 is a schematic diagram of the position and structure of the underflow discharge system in the structure of Fig. 1;

The corresponding relationship between each structure of the illustration and the name of the parts of the present utility model is as follows:

10-Concentrator body 11-Side wall of thickener body 20-Swivel ring channel

21-innermost annular channel 22-outermost annular channel 23-annular partition

24-inclined settling plate 25-bracket 26-connecting channel

27-outlet 31-annular overflow weir 32-compound overflow weir

32A-One Composite Overflow Weir 32B-Two Composite Overflow Weirs 33-Inflation Adjustment Lifting Baffle

33A-One air-inflated adjustable lifting baffle 33B-Two air-inflated adjustable lifting baffles

34-Inclined settling plate 35-Overflow collection tank

41A-center underflow collection bin 41B-both sides underflow collection bin

42A-center underflow port 42B-both sides underflow port

43A-center underflow pump 43B-both sides underflow pump

50-drive stirring mechanism 51-outer shell 52-reducer 53-drive turbine

54-rotating shaft 55-guided stirring impeller 60-main pipe 61-pressure gauge

62-slurry pipeline 63-chemical pipeline 64-pipeline mixer 70-bridge

detailed description

For ease of understanding, here in conjunction with Fig. 1-4, the specific embodiment of the present utility model is further described as follows:

The specific components of the utility model are divided into several modules, including: thickener body 10, feeding pipeline,

The stirring mechanism 50 , the rotary annular channel 20 , the overflow weir 30 and the underflow discharge system 40 are driven. Describe them one by one below:

1. Concentrator body

The body of the thickener is the basic structure of the thickener, which provides enough volume for the flocculation, settlement and clarification of the slime water.

2. Feeding pipeline

The pulp is conveyed through the pulp pipeline 62, and the medicine pipeline 63 and the pipeline mixer 64 are successively set on the pipeline for conveying the pulp; On the contrary, to realize the feeding of the medicament and the initial mixing with the pulp; then the pipeline mixer 64 is set on the vertical section of the slurry pipeline 62, in order to further realize the preliminary mixing of the medicament, the reason why the pipeline mixing is set on the vertical section The reason for this arrangement is that the degree of fluid turbulence generated by the arrangement on the horizontal section is higher, and the mixing effect is better.

3. Drive the stirring mechanism

The ore pulp enters the central feed port of the concentrator from the main feed pipe 60 with the preliminarily dispersed medicament. How to further realize the uniform mixing of the medicament and the ore pulp, and at the same time reduce the impact of the feeding process on the stable flow field in the thickener is The purpose of driving the stirring mechanism 50 is set. Utilize the driving force of the ore slurry in the main pipeline 60 of the ore slurry feeding to drive the driving turbine 53 on the rotating shaft 54 to rotate, and then drive the rotating shaft 54 and the diversion stirring impeller 55 at the lower end of the rotating shaft to rotate. Under the joint stirring action of 55, the mixing is uniform. This design converts the energy in the process of pulp transportation into the mechanical energy of chemical mixing and stirring, which not only realizes the dispersion and mixing of chemical agents, but also reduces energy consumption. It has low maintenance and low chemical consumption. At the same time, it consumes the excess kinetic energy of the pulp and reduces the impact of feeding on the stable flow field in the concentrator body; in addition, the reducer 52 is connected to the rotating shaft 54 to ensure that the driving and stirring structure 50 meets the mixing and stirring requirements of the medicine. Under low speed, it operates at a low speed to reduce the influence on the stable flow field. The function of the bell mouth design of the outer casing 51 is to gradually guide the horizontally moving slurry into a vertical movement, and the working area is located under the circular circular passage to provide a good environment for subsequent settlement and clarification.

4. Rotary ring channel

After the ore slurry flows out from the bell mouth at the lower end of the driving stirring structure 50 at a low speed, most of the solid particles move obliquely downward and enter the underflow, and most of the water carries some fine particles that are difficult to settle to the top of the concentrator, trying to enter the overflow, how to deal with it This part of the slurry with fine particle materials is the key to whether the thickener can achieve efficient clarification. The utility model creatively designs a rotary annular channel 20 on the upper layer of the thickener body, constrains the upper layer of the thickener to make it do reciprocating motion, increases the time for fine particles to stay in the thickener and increases the settlement probability of fine coal slime The convoluted annular channel 20 is made up of multiple groups of annular channels with gradually increasing diameters, and the adjacent annular channels are connected to each other by a connecting channel 26, and each group of annular channels includes an upper annular partition 23 and a lower inclined settling plate 24; ore slurry Reciprocating along the annular passage between the two partitions, the connecting passage 26 between the adjacent annular passages gradually flows into the outer annular passage from the inner annular passage. Particles, especially the sedimentation effect of fine particles; in order to allow the slurry to flow uniformly from the full section of the thickener to the overflow weir 30, multiple groups of slurry outlets 27 are arranged on the annular partition of the outermost annular channel 22 , the distance between the outlets of adjacent ore pulp is equal; the inclined settling plate 24 is fixedly arranged under the annular partition 23, and the inclined settling plate is installed at a certain inclination angle, so that the settling area increases and the particle settling distance shortens When the slurry reciprocates in the annular channel, the particles settle on the inclined settling plate and enter the underflow; the inclined settling plate 24 is supported by the bracket 25 and the side wall 11 of the thickener body to ensure the stability of the entire rotary annular channel.

5. Overflow weir

After the slurry reciprocates in the rotary annular channel, the solid content is very small, reaching the overflow discharge standard, and flows from the outlet 27 on the annular partition plate of the outermost annular channel 22 to the overflow weir 30, and the overflow The weir 30 comprises an annular overflow weir 31 and a composite overflow weir 32, and the annular overflow weir 31 and the composite overflow 32 are communicated through an overflow collection tank 35; , is discharged from the composite overflow weir, and the composite overflow weir also includes an air-inflated adjustable lifting baffle 33, which is used to flexibly adjust the processing capacity of the composite overflow weir. When the clarity of the overflow water is low, you can increase the air pressure to adjust the air pressure in the floating baffle to reduce the overflow discharge; setting up a composite overflow weir can discharge the clarified overflow water that meets the requirements. Discharge the concentrator in time to reduce the movement speed of the horizontal flow in the concentrator body. It takes a longer time for the fed pulp to move from the feeding position to the overflow weir, and the particles in the pulp have a longer time to settle into the underflow; The lower part of the overflow weir is fixed with an inclined settling plate 34, and the inclined settling plate is installed at a certain inclination angle to increase the sedimentation area and shorten the sedimentation distance of the particles. The final clarification and settlement treatment is done for the rising overflow water to ensure that the overflow Clarity of running water; the overflow water between the composite overflow weir and the side wall of the thickener body is discharged by the surrounding annular overflow weir, and the joint operation of the surrounding annular overflow weir and the composite overflow weir can improve the treatment efficiency of the thickener and clarify the overflow water degree of effect.

6. Underflow discharge system

The particles enter the underflow discharge system 40 after settling. The underflow discharge system is composed of an underflow collection bin 41, an underflow outlet 42 and a corresponding underflow pump 43; The set-up mode of the underflow collection chambers, each group of underflow collection chambers has a large wall inclination angle, which is conducive to the rapid accumulation of sediment to the underflow outlet; the underflow collection chamber 41 is conical, and the upper opening is rectangular, forming a large cross-sectional area, which is effective It is beneficial for the sediment to fall directly to the underflow collection area. The lower part of the underflow collection bin is connected to the underflow port 42. Each set of underflow collection bins has a corresponding underflow port 42 and an underflow pump 43, which facilitates the rapid delivery of materials out of the thickener; the design of the underflow discharge system, Ensure that the thickener operates normally and efficiently without raking.

In summary, the structure and working mechanism of the utility model fully consider the process characteristics of coal slime water flocculation and settlement, the flow field in the body of the thickener is stable, the effect of coal slime flocculation and settlement is good, the clarity of overflow water is high, the consumption of chemicals is low, and no rake is needed. Completely solve the phenomenon of "pressing rake". Compared with traditional concentration and settling equipment, the entire concentration operation saves more chemicals, has higher concentration efficiency, works more reliably and stably, and reduces production costs significantly.

Claims (4)

1. A rakeless thickener with a rotary annular channel, at least including a thickener body (10), characterized in that: the device also includes a rotary annular thickener for constraining the upper layer of the thickener to make it reciprocating Channel (20), the rotary annular channel (20) is centered on the center of the concentrator, and gradually expands from the inside to the outside. The innermost annular channel (21) is located around the drive stirring mechanism (50), and the outermost annular channel (22 ) is located around the compound overflow weir (32) and close to the central side of the concentrator; the rotary annular channel (20) is made up of multiple groups of annular channels with gradually increasing diameters, and the adjacent annular channels are connected by connecting channels (26 ) communicate with each other, each group of annular passages includes an upper annular partition (23) and a lower inclined settling plate (24), the annular partition (23) and the inclined settling plate (24) are connected by a fixed connection, and the inclined settling plate ( 24) Supported by the bracket (25) and the side wall (11) of the thickener body; multiple groups of slurry outlets (27) are arranged on the annular partition of the outermost annular passage (22), and the adjacent The distance between the outlets (27) of the slurry is equal; the equipment also includes an overflow weir (30) for collecting and discharging the clarified overflow liquid, and the overflow weir (30) includes an annular overflow weir (31 ), a composite overflow weir (32), an inflation-adjustable lifting baffle (33), an inclined settling plate (34), and an overflow collection tank (35). 2. A rakeless concentrator with a rotary annular channel according to claim 1, characterized in that: the overflow weir (30) comprises an annular overflow weir ( 31) and the composite overflow weir (32) arranged annularly along the inside of the body, the surrounding annular overflow weir (31) and the composite overflow weir (32) are communicated through the overflow collection groove (35); the composite overflow The side of the weir (32) close to the center of the concentrator is provided with an inflatable adjustable lifting baffle (33), and the lower part of the composite overflow weir (32) is fixedly provided with an inclined settling plate (34), and the inclined settling plate (34) passes through The support (25) is supported by the side wall (11) of the body of the concentrator; the composite overflow weir (32) includes at least one composite overflow weir (32A), two composite overflow weirs (32B), and one inflation adjustment lift Baffle plate (33A) and two road inflations regulate the lifting baffle plate (33B). 3. A rakeless concentrator with a rotary annular channel according to claim 1 or 2, characterized in that: the device also includes an underflow discharge system (40), and the underflow discharge system (40) consists of an underflow collection bin ( 41), an underflow port (42) and a corresponding underflow pump (43); the underflow collection bin (41) is composed of a central underflow collection bin (41A) and both sides of the underflow collection bin (41B), and the underflow collection bin (41 ) is conical, the upper opening is rectangular, and the bottom is connected to the bottom flow port (42); the bottom flow port (42) is composed of the center bottom flow port (42A) and the two side bottom flow ports (42B), and the material discharged from the bottom flow port (42) It is transported by the corresponding underflow pump (43); the underflow pump (43) is composed of a central underflow pump (43A) and two side underflow pumps (43B). 4. A rakeless concentrator with a rotary annular channel according to claim 1 or 2, characterized in that: the equipment also includes a driving stirring mechanism (50), and the driving stirring mechanism (50) is suspended on Above the center of the liquid surface of the concentrator body (10), the outer casing (51) of the driving stirring mechanism (50) presents a bell-shaped structure with a gradually increasing diameter from top to bottom; the outer casing (51) is coaxially arranged The rotating shaft (54) with the vertical axis, the lower section shaft body of the rotating shaft (54) is provided with a diversion stirring impeller (55) coaxially, and the upper section of the rotating shaft (54) is coaxially fixed to drive the turbine (53); The outer peripheral wall of (51) runs through and is arranged with the main pipeline (60) that is used for feeding, and the discharge direction of described main pipeline (60) points to the wheel blade place of driving turbine (53), and main pipeline (60) is provided with Pressure gauge (61), the main pipeline (60) of feeding is connected with ore slurry pipeline (62); Described ore slurry pipeline (62) is connected with medicament pipeline (63), and medicament pipeline (63) and ore slurry pipeline ( The connection point of 62) is located in the horizontal section of the pulp pipeline (62), the medicine pipeline (63) is inserted into the depth of the horizontal section axis of the pulp pipeline (62), and the direction of the medicine outlet is opposite to the direction of travel of the pulp; the pulp pipeline A pipeline mixer (64) is arranged on the vertical section of the road (62), and the pipeline mixer (64) is set in the rear of the dosing point in the order of the slurry movement direction; this equipment also includes a bridge (70) and a reducer (52), the bridge frame (70) is connected with the outer casing (51) of the drive stirring mechanism (50), and the speed reducer (52) is connected with the rotating shaft (54).