CN110538590B

CN110538590B - Stirring mechanism of vertical stirrer

Info

Publication number: CN110538590B
Application number: CN201910931975.9A
Authority: CN
Inventors: 王松; 夏鹏华; 叶坤; 耿职; 孙建国; 梁超帝; 许金明; 赵意
Original assignee: Bengbu Triumph Engineering and Technology Co Ltd
Current assignee: Bengbu Triumph Engineering and Technology Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2024-06-28
Anticipated expiration: 2039-09-29
Also published as: CN110538590A

Abstract

The invention discloses a stirring mechanism of a vertical stirrer, which relates to the field of vertical stirring and comprises a main shaft, a stirring rake connecting mechanism, a rotary joint connecting mechanism, a transmission device mounting mechanism, a rotary joint and a transmission device; the axis of the main shaft is along the vertical direction, and the main shaft is connected in a bearing with the axis arranged along the vertical direction; the stirring rake connecting mechanism is fixedly connected to the lower end of the main shaft; the rotary joint connecting mechanism is fixedly connected to the upper end of the main shaft, and the rotary joint is connected with the main shaft through the rotary joint connecting mechanism; the transmission device installation mechanism is arranged in the middle of the main shaft, the output end of the transmission device is connected with the main shaft through the transmission device installation mechanism, and the input end of the transmission device is connected with the driving device. The invention has the advantages that: the height of the vertical agitator drive station can be reduced and the swivel can be replaced conveniently and quickly.

Description

Stirring mechanism of vertical stirrer

Technical Field

The invention relates to the field of vertical stirring, in particular to a stirring mechanism of a vertical stirrer.

Background

In the float glass production line, a glass liquid stirrer is one of special equipment for producing flat glass. The glass liquid stirrer is arranged at the neck opening of the melting furnace, is used for stirring glass liquid and improving the uniformity of glass melting, and is special equipment for forcedly homogenizing the glass liquid. The glass liquid stirrer eliminates or reduces the defects which cannot be overcome by natural homogenization through mechanical stirring of stirring blades, and ensures the thermal uniformity and chemical uniformity of glass liquid entering a forming area, thereby improving the optical performance and surface quality of a glass finished product. The stirring mode of the glass liquid stirrer is divided into horizontal stirring and vertical stirring, and along with the improvement of the quality requirement of products, the vertical stirrer is more and more widely adopted, and especially the preferred vertical stirrer of high-end production lines such as information display glass, automobile glass and the like.

The vertical stirrer is characterized by vertical rotation, and a rotary joint is arranged in the stirring mechanism. The patent document with publication number CN201883016U discloses an improved vertical stirrer for high-temperature molten glass, a motor and a speed reducer are arranged at the top of a cage-type bracket, a claw clutch drives a stirring rod to rotate, a floating rotary joint is arranged in the middle of the stirring rod in combination with the accompanying figure 1 of the specification, and cooling water flows out of the floating rotary joint after flowing through stirring blades through the floating rotary joint. The driving device of the stirring mechanism of the existing vertical stirrer is arranged at the tail part of the main shaft in a rear-mounted mode, and the rotary joint is arranged at the middle part of the main shaft in a middle-mounted mode. The stirring mechanism of the existing vertical stirrer has the following defects: the rear-mounted driving device needs to support the transmission station at a very high position, and needs to be supported by an extra steel structure platform, so that the cost is high; the rotary joint belongs to a vulnerable part, and is frequently replaced, the whole stirring mechanism is required to be completely disassembled when the middle-set rotary joint is replaced, the replacement time is long, and the production is not facilitated; when the middle-set rotary joint is adopted, the side wall of the main shaft at the rotary joint is provided with water inlet and outlet holes for the rotary joint to pass water to the main shaft, and due to the structural characteristics, the middle-set rotary joint has large design diameter, more inner dynamic sealing surfaces and very high processing precision requirements, the prior art in China is difficult to meet, a large number of inlet fittings are needed, the cost is very high, and the production period is long; the large-area dynamic sealing surface of the middle-mounted rotary joint has extremely high requirements on water quality, and rust impurities in water easily cause the damage of the rotary joint, so that the defects of high failure rate, easy water leakage and the like are overcome, and the maintenance is not facilitated.

Disclosure of Invention

The invention aims to provide a stirring mechanism of a vertical stirrer, which can reduce the height of a transmission station of the vertical stirrer and can conveniently and quickly replace a rotary joint.

The invention solves the technical problems by the following technical means: the stirring mechanism of the vertical stirrer comprises a main shaft (1), a stirring rake connecting mechanism (2), a rotary joint connecting mechanism (3), a transmission device mounting mechanism (4), a rotary joint (6) and a transmission device (7); the axis of the main shaft (1) is along the vertical direction, and the main shaft (1) is connected in a bearing of which the axis is arranged along the vertical direction; the stirring rake connecting mechanism (2) is fixedly connected to the lower end of the main shaft (1); the rotary joint connecting mechanism (3) is fixedly connected to the upper end of the main shaft (1), and the rotary joint (6) is connected with the main shaft (1) through the rotary joint connecting mechanism (3); the transmission device mounting mechanism (4) is arranged in the middle of the main shaft (1), the output end of the transmission device (7) is connected with the main shaft (1) through the transmission device mounting mechanism (4), and the input end of the transmission device (7) is connected with the driving device. The transmission device is connected with the middle part of the main shaft through the transmission device mounting mechanism, and the driving device drives the main shaft through the transmission device, so that the height of the driving device can be reduced, and the height of a transmission station of the vertical mixer is reduced; the rotary joint is connected with the tail part of the main shaft through the rotary joint connecting mechanism, and the stirring mechanism of the vertical stirrer is not required to be disassembled when the rotary joint is replaced, so that the rotary joint can be conveniently and quickly replaced.

As an optimized technical scheme, the main shaft (1) comprises an outer tube (11), an inner tube (12), a water return channel (13), a water inlet channel (14) and a fixed block (15); the axis of the outer tube (11) is along the vertical direction, an outer tube cavity penetrating from the upper end to the lower end of the outer tube (11) is formed in the outer tube (11), and the outer tube cavity and the outer tube (11) are coaxially arranged; the inner tube (12) is fixedly connected in the outer tube cavity and is coaxially arranged with the outer tube (11); a gap formed between the outer side surface of the inner pipe (12) and the inner side surface of the outer pipe (11) is a water return channel (13); a water inlet channel (14) penetrating from the upper end to the lower end of the inner tube (12) is formed in the inner tube (12), and the water inlet channel (14) and the inner tube (12) are coaxially arranged; the inner tube (12) is fixedly connected with the outer tube (11) through the fixing blocks (15), one ends of the fixing blocks (15) are fixedly connected with the outer side face of the inner tube (12), and the other ends of the fixing blocks are fixedly connected with the inner side face of the outer tube (11).

As an optimized technical scheme, the stirring rake connecting mechanism (2) comprises a main shaft lower end flange (21), a water inlet hole (22), a water return hole (23), a first sealing groove (24) and a second sealing groove (25); the main shaft lower end flange (21) is coaxially arranged with the main shaft (1), and the main shaft lower end flange (21) is fixedly connected to the lower end of the main shaft (1); a water inlet hole (22) penetrating from the top surface to the bottom surface of the main shaft lower end flange (21) is formed in the center of the main shaft lower end flange, and the water inlet hole (22) and the water inlet channel (14) are coaxially arranged and communicated with each other; the main shaft lower end flange (21) is also provided with a plurality of water return holes (23) penetrating from the top surface to the bottom surface, each water return hole (23) is positioned on the outer ring of the water inlet hole (21) and the inner ring of the water return channel (13), each water return hole (23) is uniformly distributed on the outer ring of the water inlet hole (22), and the axes of each water return hole (23) are all along the vertical direction and are communicated with the water return channel (13); a first sealing groove (24) and a second sealing groove (25) are formed in the bottom surface of the lower end flange (21) of the main shaft; the first sealing groove (24) is positioned on the outer ring of the water inlet hole (22) and the inner ring of the water return hole (23), and the second sealing groove (25) is positioned on the outer ring of the water return hole (23); the first sealing groove (24) and the second sealing groove (25) are annular, and a first sealing ring and a second sealing ring are respectively arranged in the first sealing groove (24) and the second sealing groove (25).

As an optimized technical scheme, the rotary joint connecting mechanism (3) comprises a stop block (31) and a looper flange (32); an annular baffle mounting groove is formed in the outer ring of the upper end of the outer tube (11), the baffle (31) comprises two haffords which are fixedly connected to two sides in the baffle mounting groove respectively, and the outer side surface of the baffle (31) is an inclined surface which is gradually folded inwards from top to bottom; the loose flange (32) is provided with a stop block mounting hole penetrating from the top surface to the bottom surface, and the inner side surface of the stop block mounting hole is an inclined surface matched with the outer side surface of the stop block (31); the movable sleeve flange (32) is sleeved on the outer ring of the stop block (31), the inner side surface of the stop block mounting hole is attached to the outer side surface of the stop block (31), and the stop block (31) and the movable sleeve flange (32) are spliced into a flange structure which is coaxially arranged with the main shaft (1).

As an optimized technical scheme, the rotary joint (6) comprises a rotary part (61), a fixed part (62), a rotary joint flange (63), a sealing gasket (64), a backwater cavity (65), a backwater port (66), a water inlet (67) and a rotary joint sealing ring (68); the rotating part (61) is arranged below the fixed part (62), and the rotating part (61) is rotationally connected with the fixed part (62); the rotary joint flange (63) is fixedly connected to the lower end of the rotary part (61), the rotary joint flange (63) is fixedly connected with the looper flange (32), and a sealing gasket (64) is arranged between the bottom of the rotary joint flange (63) and the upper end of the outer tube (11); the rotary joint flange (63) is fixedly connected with the looper flange (32), and a sealing gasket is arranged between the bottom of the rotary joint flange (63) and the upper end of the outer tube (11); the inner cavity of the rotating part (61) is communicated with the inner cavity of the fixed part (62) to form the backwater cavity (65), and the central hole of the rotating joint flange (63) is communicated with the backwater cavity (65); the upper part of the inner pipe (12) extends into the backwater cavity (65) from the central hole of the rotary joint flange (63) and can rotate in the backwater cavity (65); the upper part of the inner tube (12) extends into the backwater cavity (65) from the central hole of the rotary joint flange (63), and the inner tube (12) can rotate in the backwater cavity (65); the upper end opening of the backwater channel (13) is communicated with the backwater cavity (65) through a gap between the outer side surface of the inner pipe (12) and the inner side surface of the central hole of the rotary joint flange (63); the water return port (66) is fixedly connected to one side of the fixed part (62), and the water return port (66) is communicated with the water return channel (13) through the water return cavity (65); the water inlet (67) is fixedly connected to the upper part of the fixing part (62), and the water inlet (67) is communicated with the upper end opening of the water inlet channel (14); a plurality of rotary joint sealing rings (68) are arranged at the upper part of the backwater cavity (65) at intervals up and down, each rotary joint sealing ring (68) is sleeved on the outer ring of the upper end of the inner tube (12), and the rotary joint sealing rings (68) are sealed between the water inlet (67) and the backwater cavity (65).

As an optimized technical scheme, the stirring mechanism of the vertical stirrer further comprises a bracket (5), wherein the bracket (5) comprises a bottom plate (51), a top plate (52), a supporting structure (53), a lower bearing seat (54), an upper bearing seat (55) and a main shaft bearing (56); the bottom plate (51) is horizontally arranged, the top plate (52) is horizontally arranged below the bottom plate (51), through holes with axes along the vertical direction are formed in the centers of the bottom plate (51) and the top plate (52), and the through holes in the bottom plate (51) and the through holes in the top plate (52) are coaxially arranged; the supporting structure (53) is fixedly connected between the bottom plate (51) and the top plate (52); the lower bearing seat (54) is arranged below the bottom plate (51) and is fixedly connected with the bottom plate (51); the upper bearing seat (55) is arranged above the top plate (52) and is fixedly connected with the top plate (52); spindle bearings (56) are respectively arranged in the inner cavities of the lower bearing seat (54) and the upper bearing seat (55), and each spindle bearing (56) is coaxially arranged with a through hole on the bottom plate (51) and a through hole on the top plate (52); the main shaft (1) sequentially passes through the lower bearing seat (54), the through hole on the bottom plate (51), the through hole on the top plate (52), the upper bearing seat (55) and is connected in the bearing holes of all the main shaft bearings (56), the stirring rake connecting mechanism (2) is positioned below the lower bearing seat (54), and the rotary joint connecting mechanism (3) is positioned above the upper bearing seat (55).

As an optimized technical scheme, the main shaft (1) comprises an outer tube (11), and the axis of the outer tube (11) is along the vertical direction; the outer tube (11) comprises a first step part (111), a second step part (112) and a third step part (113), wherein the first step part (111), the second step part (112) and the third step part (113) are sequentially and fixedly connected from bottom to top, the first step part (111), the second step part (112) and the third step part (113) are all vertically arranged cylinders, the diameters of the cylinders are sequentially reduced, and the first step part (111), the second step part (112) and the third step part (113) are coaxially arranged; the part of the upper end of the first step part (111) protruding out of the outer ring of the second step part (112) is clamped on the outer ring of the lower end opening of the lower bearing seat (54); the part of the upper end of the second step part (112) protruding out of the outer ring of the third step part (113) is clamped at the lower end of the transmission device (7).

As an optimized technical scheme, the transmission device (7) comprises an input mechanism (76) and an output mechanism (77); the input mechanism (76) comprises an input shaft (763), wherein the axis of the input shaft (763) is along the horizontal direction, and the input shaft (763) is connected in a bearing of which the axis is arranged along the horizontal direction; the output mechanism (77) comprises an output shaft (773) and a main shaft mounting hole (774); the axis of the output shaft (773) is along the vertical direction, and the output shaft (773) is connected in a bearing of which the axis is arranged along the vertical direction; the output shaft (773) is provided with a main shaft mounting hole (774) penetrating from the upper end to the lower end of the output shaft, and the main shaft mounting hole (774) and the output shaft (773) are coaxially arranged; a steering mechanism is arranged between the input shaft (763) and the output shaft (773), and the steering mechanism can convert rotation of a horizontal shaft into rotation of a vertical shaft.

As an optimized technical scheme, the input mechanism (76) further comprises an input shaft key groove (764) and an input shaft flange (765); an input shaft key groove (764) is formed in one end of the input shaft (763); the input shaft flange (765) comprises a connecting sleeve, a flange plate, a shaft head mounting cavity and a connecting sleeve key groove; the connecting sleeve and the flange plate are coaxially arranged, and one end of the connecting sleeve is fixedly connected with one end of the flange plate; the other end of the connecting sleeve is provided with a shaft head mounting cavity, and the shaft head mounting cavity and the connecting sleeve are coaxially arranged; a connecting sleeve key slot is formed in the inner side surface of the shaft head installation cavity; the connecting sleeve is sleeved on the outer ring of the input shaft head through the shaft head mounting cavity, two sides of an input shaft connecting key are respectively arranged in the input shaft key slot (764) and the connecting sleeve key slot, and the input shaft (763) is connected with the input shaft flange (765) in a key way;

an output shaft key groove (775) is formed in the inner side surface of the main shaft mounting hole (774), the transmission device mounting mechanism (4) is a key groove formed in the outer side surface of the main shaft (1), the output shaft (773) is sleeved on the outer ring of the main shaft (1) through the main shaft mounting hole (774), and two sides of a main shaft connecting key are respectively arranged in the transmission device mounting mechanism (4) and the output shaft key groove (775) to enable the main shaft (1) to be in key connection with the output shaft (773).

As an optimized technical scheme, the transmission device (7) further comprises a box body (71), a first end cover (72), a second end cover (73), a third end cover (74), a fourth end cover (75), a driving gear (78) and a driven gear (79);

the box body (71) is a hollow cuboid; input shaft mounting holes are respectively formed in two opposite vertical side plates of the box body (71), and the two input shaft mounting holes are oppositely arranged; the first end cover (72) and the second end cover (73) are respectively covered on the outer sides of the two input shaft mounting holes, and an input shaft passing hole is formed in the center of the first end cover (72); output shaft mounting holes are respectively formed in the top horizontal plate and the bottom horizontal plate of the box body (71), and the two output shaft mounting holes are oppositely arranged; the third end cover (74) covers the outer side of the output shaft mounting hole on the top horizontal plate, the fourth end cover (75) covers the outer side of the output shaft mounting hole on the bottom horizontal plate, and output shaft passing holes are respectively formed in the centers of the third end cover (74) and the fourth end cover (75);

The input mechanism (76) further comprises a first bearing (761), a second bearing (762), an input shaft sealing ring (766) and a retainer ring (767); the axes of the first bearing (761) and the second bearing (762) are arranged along the horizontal direction and are respectively and fixedly connected in the two input shaft mounting holes, and the first bearing (761) and the second bearing (762) are respectively positioned on the inner sides of the first end cover (72) and the second end cover (73); the input shaft (763) comprises an input shaft main body, an input shaft head and an input shaft retainer ring, wherein the input shaft head is fixedly connected to one end of the input shaft main body, the input shaft retainer ring is fixedly connected to the outer ring of the input shaft main body, and the input shaft main body, the input shaft head and the input shaft retainer ring are coaxially arranged; the two ends of the input shaft main body are respectively connected in bearing holes of the first bearing (761) and the second bearing (762), one end of the input shaft main body connected with the input shaft head extends out of the box body (71) from the input shaft through hole, the other end of the input shaft main body is positioned at the inner side of the second end cover (73), and the input shaft check ring is positioned in an inner cavity of the box body (71); the input shaft key groove (764) is formed in the side wall of the input shaft head; the input shaft sealing ring (766) is arranged between the first bearing (761) and the first end cover (72) and sleeved on the outer ring of the input shaft main body; the retainer ring (767) is arranged in the internal cavity of the box body (71) and sleeved on the outer ring of the input shaft main body;

The output mechanism (77) further comprises a third bearing (771), a fourth bearing (772) and an output shaft sealing ring (776); the axes of the two third bearings (771) are arranged along the vertical direction and are respectively and fixedly connected in the two output shaft mounting holes, and the two third bearings (771) are respectively positioned at the inner sides of the third end cover (74) and the fourth end cover (75); the output shaft (773) comprises an output shaft main body and bearing connecting ends, wherein the two bearing connecting ends are respectively fixedly connected to two ends of the output shaft main body and are coaxially arranged with the output shaft main body; the two bearing connecting ends are respectively connected in bearing holes of the third bearing (771) and the fourth bearing (772), the two bearing connecting ends respectively extend out of the box body (71) from two output shafts through holes, and the output shaft main body is positioned in an inner cavity of the box body (71); two output shaft sealing rings (776) are respectively arranged between the third bearing (771) and the third end cover (74) and between the fourth bearing (772) and the fourth end cover (75), and the two output shaft sealing rings (776) are respectively sleeved on the outer rings of the connecting ends of the two bearings;

The steering mechanism comprises a driving gear (78) and a driven gear (79), wherein the driving gear (78) and the driven gear (79) adopt helical gears; the driving gear (78) is fixedly connected to the outer ring of the input shaft main body, the input shaft retainer ring is positioned between the driving gear (78) and the first bearing (761), and the retainer ring (767) is positioned between the driving gear (78) and the second bearing (762); the driven gear (79) is fixedly connected to the outer ring of the output shaft main body, and the driving gear (78) is in fit transmission with the driven gear (79).

The invention has the advantages that:

1. The transmission device is connected with the middle part of the main shaft through the transmission device mounting mechanism, and the driving device drives the main shaft through the transmission device, so that the height of the driving device can be reduced, the height of a transmission station of the vertical mixer is reduced, and the investment cost of enterprises is reduced.

2. The rotary joint is connected with the tail of the main shaft through the rotary joint connecting mechanism, and the stirring mechanism of the vertical stirrer is not required to be disassembled when the rotary joint is replaced, so that the rotary joint can be conveniently and quickly replaced, and the production of enterprises is facilitated.

3. Due to the structural characteristics of the rear rotary joint, the diameter of the rotary joint is reduced, the dynamic sealing area is reduced, the processing difficulty is reduced, the cost is reduced, and the production period is shortened.

4. Because of the structural characteristics, the rear rotary joint reduces the dynamic sealing area, has general requirements on water quality, overcomes the defects of high failure rate, easy water leakage and the like, and is beneficial to the maintenance of enterprises.

Drawings

Fig. 1 is a schematic view showing a state in which a stirring mechanism of a vertical stirrer according to an embodiment of the present invention is installed and used.

Fig. 2 is a schematic structural view of a stirring mechanism of a vertical stirrer according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a spindle and swivel connection in accordance with an embodiment of the invention.

Fig. 4 is a schematic cross-sectional view of a spindle in accordance with an embodiment of the present invention.

Fig. 5 is a schematic top view of a spindle according to an embodiment of the present invention.

Fig. 6 is an enlarged view of position a on a schematic cross-sectional view of a spindle and swivel connection in accordance with an embodiment of the invention.

Fig. 7 is a schematic bottom view of an embodiment of the rake attachment mechanism of the present invention.

Fig. 8 is an enlarged view of position B on a schematic cross-sectional view of a spindle and swivel connection in accordance with an embodiment of the invention.

Fig. 9 is a partial semi-sectional schematic view of a stent according to an embodiment of the present invention.

Fig. 10 is an isometric view of a base plate, top plate and support structure of a stand in accordance with an embodiment of the present invention.

Fig. 11 is a partial semi-cutaway schematic view of a rotary union according to an embodiment of the present invention.

Fig. 12 is a schematic front view of a transmission according to an embodiment of the present invention.

Fig. 13 is a schematic top view of an embodiment of the transmission of the present invention.

Fig. 14 is a partial semi-cutaway schematic view of the transmission of an embodiment of the present invention in a front view.

Fig. 15 is a schematic structural view of an input shaft of a transmission according to an embodiment of the present invention.

Fig. 16 is a partial semi-cutaway schematic view of a top view of an embodiment of the transmission of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 16, the stirring mechanism of the vertical stirrer comprises a main shaft 1, a stirring rake connecting mechanism 2, a rotary joint connecting mechanism 3, a transmission device mounting mechanism 4, a bracket 5, a rotary joint 6 and a transmission device 7.

As shown in fig. 1 to 4, the axis of the main shaft 1 is in the vertical direction; the support 5 is fixedly connected to a supporting platform 8 above the glass liquid stirring container, a bearing with an axis arranged along the vertical direction is arranged in the support 5, and the middle part of the main shaft 1 is connected to the bearing in the support 5; the stirring rake connecting mechanism 2 is fixedly connected to the lower end of the main shaft 1, the stirring rake connecting mechanism 2 is positioned below the bracket 5, the upper end flange of the stirring rake 9 is fixedly connected with the stirring rake connecting mechanism 2 through bolts, and the stirring rake 9 is used for stirring glass liquid; the rotary joint connecting mechanism 3 is fixedly connected to the upper end of the main shaft 1, the rotary joint connecting mechanism 3 is positioned above the bracket 5, the rotary joint 6 is connected with the main shaft 1 through the rotary joint connecting mechanism 3, and the rotary joint 6 is used for connecting a water inlet and outlet pipeline of cooling water; the transmission device mounting mechanism 4 is arranged in the middle of the main shaft 1, the rotary transmission device 7 is arranged in the bracket 5, the output end of the transmission device 7 is connected with the main shaft 1 through the transmission device mounting mechanism 4, and the input end of the transmission device 7 is connected with a driving device (not shown in the figure); the driving device adopts a motor, an output shaft of the motor is horizontally arranged, an input end of the transmission device 7 is fixedly connected with an output shaft of the motor, and the output shaft of the motor drives the main shaft 1 through the transmission device 7.

As shown in fig. 3 to 5, the main shaft 1 includes an outer tube 11, an inner tube 12, a return water channel 13, a water inlet channel 14, and a fixing block 15.

The axis of the outer tube 11 is in the vertical direction; the outer tube 11 comprises a first step part 111, a second step part 112 and a third step part 113, the first step part 111, the second step part 112 and the third step part 113 are sequentially and fixedly connected from bottom to top, the first step part 111, the second step part 112 and the third step part 113 are all vertically arranged cylinders, the diameters of the first step part 111, the second step part 112 and the third step part 113 are sequentially reduced, the first step part 111, the second step part 112 and the third step part 113 are coaxially arranged, the first step part 111, the second step part 112 and the third step part 113 are of an integrated structure, and the first step part 111, the second step part 112 and the third step part 113 are used for positioning and mounting the main shaft 1; the outer tube 11 is provided with an outer tube cavity penetrating from the upper end of the first step portion 111 to the lower end of the third step portion 113, and the outer tube cavity is cylindrical and is coaxially arranged with the outer tube 11.

The inner tube 12 is a cylinder, the inner tube 12 is fixedly connected in the outer tube cavity and is coaxially arranged with the outer tube 11, the upper end of the inner tube 12 extends out from the upper end opening of the outer tube cavity to the upper side of the outer tube 11, and the lower end of the inner tube 12 is flush with the lower end of the outer tube 11.

A circular cylinder gap formed between the outer side surface of the inner pipe 12 and the inner side surface of the outer pipe 11 is a water return channel 13; the inner tube 12 is provided with a water inlet channel 14 penetrating from the upper end to the lower end, and the water inlet channel 14 is cylindrical and is coaxially arranged with the inner tube 12.

The inner tube 12 and the outer tube 11 are fixedly connected through the fixing blocks 15, the fixing blocks 15 are arranged at the opening of the upper end of the outer tube 11, four strip-shaped fixing blocks 15 are arranged at equal intervals along the circumference of the outer ring of the inner tube 12, one end of each fixing block 15 is welded on the outer side face of the inner tube 12, and the other end is welded on the inner side face of the outer tube 11.

As shown in fig. 6 and 7, the rake connection mechanism 2 includes a main shaft lower end flange 21, a water inlet 22, a water return 23, a first seal groove 24, and a second seal groove 25.

The lower end flange 21 of the main shaft is a cylinder and is coaxially arranged with the main shaft 1, and the lower end flange 21 of the main shaft is welded at the lower end of the main shaft 1.

The center of the main shaft lower end flange 21 is provided with a water inlet hole 22 penetrating from the top surface to the bottom surface, the water inlet hole 22 is a cylinder and is coaxially arranged with the water inlet channel 14 and communicated with the water inlet channel 14, and the water inlet hole 22 is communicated between the water inlet channel 14 and the inlet of the cooling water circulation channel communicated with the stirring rake 9 and is separated from the water return channel 13.

The main shaft lower extreme flange 21 is last still to have offered four return water holes 23 that run through to its bottom surface from its top surface, and each return water hole 23 all is located the outer lane of inlet port 22 and the inner circle of return water passageway 13, and each return water hole 23 evenly distributed in the outer lane of inlet port 22, and the cross section of each return water hole 23 is along the curved arc strip of the outer lane circumferencial direction of inlet port 22, and the axis of each return water hole 23 all is along vertical direction and intercommunication return water passageway 13, and each return water hole 23 intercommunication is between return water passageway 13 and the cooling water circulation channel export that leads to stirring rake 9 and separate with inlet channel 14.

The bottom surface of the main shaft lower end flange 21 is provided with a first sealing groove 24 and a second sealing groove 25; the first sealing groove 24 is positioned on the outer ring of the water inlet hole 22 and the inner ring of the water return hole 23, and the second sealing groove 25 is positioned on the outer ring of the water return hole 23; the first sealing groove 24 and the second sealing groove 25 are both annular and are coaxially arranged with the water inlet hole 22, a first sealing ring and a second sealing ring are respectively arranged in the first sealing groove 24 and the second sealing groove 25, the first sealing ring and the second sealing ring are O-shaped sealing rings, the first sealing ring is sealed between the water inlet hole 22 and the outlet of the cooling water circulation channel of the stirring rake 9, and the second sealing ring is sealed between the water inlet hole 22 and the inlet of the cooling water circulation channel of the stirring rake 9.

As shown in fig. 8, the rotary joint connection mechanism 3 includes a stopper 31 and a looper flange 32.

The upper end outer lane of outer tube 11 has seted up annular dog mounting groove, and dog 31 includes two arc ha fei pieces, and two ha fei pieces are fixed connection respectively in the both sides in the dog mounting groove, the lateral surface of dog 31 is the inclined plane of from the top down inwards drawing in gradually.

The looper flange 32 is a cylinder, and a stop block mounting hole penetrating from the top surface to the bottom surface of the looper flange 32 is formed in the looper flange 32 and is coaxially arranged with the looper flange 32, and the inner side surface of the stop block mounting hole is an inclined surface matched with the outer side surface of the stop block 31.

The looper flange 32 is sleeved on the outer ring of the stop block 31, the inner side surface of the stop block mounting hole is attached to the outer side surface of the stop block 31, and the stop block 31 and the looper flange 32 are spliced into a flange structure which is coaxially arranged with the main shaft 1.

As shown in fig. 3 and 4, the transmission mounting mechanism 4 is a key groove formed in the lower outer surface of the third step portion 113.

As shown in fig. 9 and 10, the bracket 5 includes a bottom plate 51, a top plate 52, a support structure 53, a lower bearing housing 54, an upper bearing housing 55, and a main shaft bearing 56.

The bottom plate 51 is the circular plate that the level set up, and roof 52 is the circular plate that the diameter is less than the bottom plate 51 diameter, and roof 52 level sets up in the top of bottom plate 51, and the circular through-hole of axis along vertical direction has all been seted up at the center of bottom plate 51 and roof, and the through-hole diameter on bottom plate 51 is the same and coaxial setting with the through-hole diameter on the roof 52.

The supporting structure 53 is fixedly connected between the bottom plate 51 and the top plate 52, the supporting structure 53 comprises four supporting columns, the supporting columns are arranged at equal intervals along the periphery of the edges of the bottom plate 51 and the top plate 52, the lower ends of the supporting columns are welded on the top surface of the bottom plate 51, and the upper ends of the supporting columns are welded on the bottom surface of the top plate 52.

The lower bearing seat 54 is arranged below the bottom plate 51 and fixedly connected with the bottom plate 51 through bolts, the upper bearing seat 55 is arranged above the top plate 52 and fixedly connected with the top plate 52 through bolts, the main shaft bearings 56 are respectively arranged in the inner cavities of the lower bearing seat 54 and the upper bearing seat 55, and each main shaft bearing 56 is coaxially arranged with the through hole on the bottom plate 51 and the through hole on the top plate 52.

The main shaft 1 sequentially passes through the lower bearing seat 54, the through hole on the bottom plate 51, the through hole on the top plate 52, the upper bearing seat 55 and is connected in the bearing holes of the main shaft bearings 56, the stirring rake connecting mechanism 2 is positioned below the lower bearing seat 54, and the rotary joint connecting mechanism 3 is positioned above the upper bearing seat 55.

The part of the upper end of the first step part 111 protruding out of the outer ring of the second step part 112 is clamped at the outer ring of the lower end opening of the lower bearing seat 54, the part of the upper end of the second step part 112 protruding out of the outer ring of the third step part 113 is clamped at the lower end of the transmission device 7, and the transmission device 7 is positioned between the bottom plate 51 and the top plate 52.

As shown in fig. 3, 8 and 11, the rotary joint 6 includes a rotary part 61, a fixed part 62, a rotary joint flange 63, a seal gasket 64, a return water cavity 65, a return water port 66, a water inlet 67 and a rotary joint seal ring 68.

The rotating part 61 is provided below the fixed part 62, and an upper part of the rotating part 61 is rotatably connected to an inside of the fixed part 62 through a bearing; the rotary joint flange 63 is fixedly connected to the lower end of the rotary part 61, the rotary joint flange 63 is fixedly connected with the looper flange 32 through bolts, and a sealing gasket 64 is arranged between the bottom of the rotary joint flange 63 and the upper end of the outer tube 11; when the spindle 1 rotates, the rotating portion 61 rotates together with the spindle 1, and the fixing portion 62 is fixed.

The inner cavity of the rotating part 61 is communicated with the inner cavity of the fixed part 62 to form a backwater cavity 65, and the central hole of the rotating joint flange 63 is communicated with the backwater cavity 65; the upper part of the inner tube 12 extends into the backwater cavity 65 from the central hole of the rotary joint flange 63 and can rotate in the backwater cavity 65, and when the main shaft 1 rotates, the inner tube 12 rotates together with the main shaft; the upper end opening of the water return channel 13 communicates with the water return cavity 65 through a gap between the outer side surface of the inner tube 12 and the inner side surface of the center hole of the swivel flange 63.

The water return port 66 is fixedly connected to one side of the fixed part 62, and the water return port 66 is communicated with the water return channel 13 through the water return cavity 65; the water inlet 67 is fixedly connected to the upper portion of the fixing portion 62, and the water inlet 67 is communicated with the upper end opening of the water inlet channel 14.

The two rotary joint sealing rings 68 are arranged at the upper part of the backwater cavity 65 at intervals up and down, each rotary joint sealing ring 68 is sleeved on the outer ring of the upper end of the inner pipe 12, and the rotary joint sealing rings 68 are sealed between the water inlet 67 and the backwater cavity 65.

After entering the water inlet 67, cooling water enters the water inlet 14 from the upper opening of the water inlet 14, then enters the cooling water circulation channel inlet of the stirring rake 9 from the water inlet 22, then flows out from the cooling water circulation channel outlet after passing through the execution unit of the stirring rake 9, then enters the water return channel 13 from the water return hole 23, then enters the water return port 66 from the upper opening of the water return channel 13, and finally flows out from the water return port 66.

As shown in fig. 12 to 16, the transmission 7 includes a case 71, a first end cover 72, a second end cover 73, a third end cover 74, a fourth end cover 75, an input mechanism 76, an output mechanism 77, a driving gear 78, and a driven gear 79.

The case 71 is a hollow rectangular parallelepiped; input shaft mounting holes are respectively formed in two opposite vertical side plates of the box body 71, and the two input shaft mounting holes are oppositely arranged; the first end cover 72 and the second end cover 73 cover the outer sides of the two input shaft mounting holes, respectively, and an input shaft passing hole is formed in the center of the first end cover 72.

The box 71 is positioned between the bottom plate 51 and the top plate 52 of the bracket 5, output shaft mounting holes are respectively formed in the top horizontal plate and the bottom horizontal plate of the box 71, and the two output shaft mounting holes are oppositely arranged; the third end cover 74 covers the outer side of the output shaft mounting hole on the top horizontal plate, the fourth end cover 75 covers the outer side of the output shaft mounting hole on the bottom horizontal plate, and output shaft passing holes are respectively formed in the centers of the third end cover 74 and the fourth end cover 75.

The input mechanism 76 includes a first bearing 761, a second bearing 762, an input shaft 763, an input shaft keyway 764, an input shaft flange 765, an input shaft seal 766, and a retainer 767.

The axes of the first bearing 761 and the second bearing 762 are arranged along the horizontal direction and are respectively and fixedly connected in the two input shaft mounting holes, and the first bearing 761 and the second bearing 762 are respectively positioned on the inner sides of the first end cover 72 and the second end cover 73.

The input shaft 763 comprises an input shaft main body, an input shaft head and an input shaft retainer ring, wherein the input shaft main body is a cylinder, the input shaft head is a cylinder with the diameter smaller than that of the input shaft main body and is fixedly connected with one end of the input shaft main body, the input shaft retainer ring is a circular cylinder and is fixedly connected with the outer ring of the input shaft main body, the input shaft head and the input shaft retainer ring are coaxially arranged, and the input shaft main body, the input shaft head and the input shaft retainer ring are of an integrated structure.

The axis of the input shaft 763 is along the horizontal direction, two ends of the input shaft main body are respectively connected in the bearing holes of the first bearing 761 and the second bearing 762, one end of the input shaft main body, which is connected with the shaft head of the input shaft, extends out of the box 71 from the input shaft through hole, the other end of the input shaft main body is positioned at the inner side of the second end cover 73, and the input shaft retainer ring is positioned at one side, close to the first bearing 761, in the inner cavity of the box 71.

An input shaft key slot 764 is formed in the side wall of the input shaft head at one end of the input shaft 763 extending out of the box 71.

The input shaft flange 765 comprises a connecting sleeve, a flange plate, a shaft head mounting cavity and a connecting sleeve key groove; the connecting sleeve and the flange plate are both cylinders and are coaxially arranged, and one end of the connecting sleeve is fixedly connected with one end of the flange plate; the other end of the connecting sleeve is provided with a shaft head installation cavity which is a cylinder and is coaxially arranged with the connecting sleeve; a connecting sleeve key slot is formed in the inner side surface of the shaft head installation cavity; the connecting sleeve is sleeved on the outer ring of the input shaft head through the shaft head mounting cavity, two sides of an input shaft connecting key are respectively arranged in an input shaft key slot 764 and the connecting sleeve key slot, and an input shaft 763 is connected with an input shaft flange 765 in a key way; an output end flange is fixedly connected to an output shaft of the motor, and an input shaft flange 765 is fixedly connected with the output end flange through bolts.

The input shaft seal 766 is a lip seal, and the input shaft seal 766 is disposed between the first bearing 761 and the first end cover 72 and sleeved on the outer ring of the input shaft main body, so as to seal lubricating oil.

The retainer 767 is disposed in the interior cavity of the housing 71 and is sleeved on the outer race of the input shaft body on the side thereof adjacent to the second bearing 762.

The output mechanism 77 includes a third bearing 771, a fourth bearing 772, an output shaft 773, a spindle mounting hole 774, an output shaft keyway 775, and an output shaft seal ring 776.

The axes of the two third bearings 771 are all arranged along the vertical direction and are respectively and fixedly connected in the two output shaft mounting holes, and the two third bearings 771 are respectively positioned on the inner sides of the third end cover 74 and the fourth end cover 75.

The output shaft 773 includes output shaft main part, bearing link, output shaft main part is the cylinder, and two bearing link are the diameter is less than the cylinder of output shaft main part diameter, two bearing link respectively fixed connection be in output shaft main part's both ends and with the coaxial setting of output shaft main part, output shaft main part and two bearing link are integrated into one piece structure.

The axis of the output shaft 773 is in the vertical direction, two bearing connection ends are respectively connected in the bearing holes of the third bearing 771 and the fourth bearing 772, two bearing connection ends respectively extend out of the box 71 from two output shaft through holes, and the output shaft main body is located in the inner cavity of the box 71.

The output shaft 773 is provided with a spindle mounting hole 774 penetrating from the upper end to the lower end thereof, and the spindle mounting hole 774 is cylindrical and is coaxially arranged with the output shaft 773.

The portion of the upper end of the second stepped portion 112 of the outer tube 11 protruding from the outer ring of the third stepped portion 113 thereof is caught in the lower end opening outer ring of the spindle mounting hole 774.

An output shaft key groove 775 is formed in the inner side surface of the main shaft mounting hole 774, an output shaft 773 is sleeved on the outer ring of the main shaft 1 in an empty sleeve mode through the main shaft mounting hole 774, and two sides of a main shaft connecting key are respectively arranged in the transmission device mounting mechanism 4 and the output shaft key groove 775 to connect the main shaft 1 with the output shaft 773 in a key way.

The output shaft sealing rings 776 are lip-shaped sealing rings, the two output shaft sealing rings 776 are respectively arranged between the third bearing 771 and the third end cover 74 and between the fourth bearing 772 and the fourth end cover 75, and the two output shaft sealing rings 776 are respectively sleeved on the outer rings of the connecting ends of the two bearings and used for sealing lubricating oil.

A steering mechanism is provided between the input shaft 763 and the output shaft 773, the steering mechanism being capable of converting rotation of the horizontal shaft into rotation of the vertical shaft; the steering mechanism comprises a driving gear 78 and a driven gear 79, wherein the driving gear 78 and the driven gear 79 are both helical gears, and the steering mechanism can also adopt bevel gears, worm gears and the like; the driving gear 78 is fixedly connected to the middle part of the outer ring of the input shaft main body, the input shaft retainer ring is positioned between the driving gear 78 and the first bearing 761, and the retainer ring 767 is positioned between the driving gear 78 and the second bearing 762; the driven gear 79 is fixedly connected to the middle part of the outer ring of the output shaft main body, the driving gear 78 and the driven gear 79 are arranged in a 90-degree cross mode in the inner cavity of the box 71, and the driving gear 78 and the driven gear 79 are in fit transmission.

The output shaft of the motor rotates to drive the input shaft 763 to rotate, so that the driving gear 78 is driven to rotate by the driving gear 78, the output shaft 773 is driven to rotate, and the output shaft 773 drives the main shaft 1 to rotate. The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stirring mechanism of a vertical stirrer, which is characterized in that: comprises a main shaft (1), a stirring rake connecting mechanism (2), a rotary joint connecting mechanism (3), a transmission device mounting mechanism (4), a rotary joint (6) and a transmission device (7); the axis of the main shaft (1) is along the vertical direction, and the main shaft (1) is connected in a bearing of which the axis is arranged along the vertical direction; the stirring rake connecting mechanism (2) is fixedly connected to the lower end of the main shaft (1); the rotary joint connecting mechanism (3) is fixedly connected to the upper end of the main shaft (1), and the rotary joint (6) is connected with the main shaft (1) through the rotary joint connecting mechanism (3); the transmission device mounting mechanism (4) is arranged in the middle of the main shaft (1), the output end of the transmission device (7) is connected with the main shaft (1) through the transmission device mounting mechanism (4), and the input end of the transmission device (7) is connected with the driving device;

The transmission device (7) comprises an input mechanism (76) and an output mechanism (77); the input mechanism (76) comprises an input shaft (763), wherein the axis of the input shaft (763) is along the horizontal direction, and the input shaft (763) is connected in a bearing of which the axis is arranged along the horizontal direction; the output mechanism (77) comprises an output shaft (773) and a main shaft mounting hole (774); the axis of the output shaft (773) is along the vertical direction, and the output shaft (773) is connected in a bearing of which the axis is arranged along the vertical direction; the output shaft (773) is provided with a main shaft mounting hole (774) penetrating from the upper end to the lower end of the output shaft, and the main shaft mounting hole (774) and the output shaft (773) are coaxially arranged; a steering mechanism is arranged between the input shaft (763) and the output shaft (773), and can convert the rotation of the horizontal shaft into the rotation of the vertical shaft;

The input mechanism (76) further comprises an input shaft keyway (764), an input shaft flange (765); an input shaft key groove (764) is formed in one end of the input shaft (763); the input shaft flange (765) comprises a connecting sleeve, a flange plate, a shaft head mounting cavity and a connecting sleeve key groove; the connecting sleeve and the flange plate are coaxially arranged, and one end of the connecting sleeve is fixedly connected with one end of the flange plate; the other end of the connecting sleeve is provided with a shaft head mounting cavity, and the shaft head mounting cavity and the connecting sleeve are coaxially arranged; a connecting sleeve key slot is formed in the inner side surface of the shaft head installation cavity; the connecting sleeve is sleeved on the outer ring of the input shaft head through the shaft head mounting cavity, two sides of an input shaft connecting key are respectively arranged in the input shaft key slot (764) and the connecting sleeve key slot, and the input shaft (763) is connected with the input shaft flange (765) in a key way;

An output shaft key groove (775) is formed in the inner side surface of the main shaft mounting hole (774), the transmission device mounting mechanism (4) is a key groove formed in the outer side surface of the main shaft (1), the output shaft (773) is sleeved on the outer ring of the main shaft (1) through the main shaft mounting hole (774), and two sides of a main shaft connecting key are respectively arranged in the transmission device mounting mechanism (4) and the output shaft key groove (775) to connect the main shaft (1) with the output shaft (773) in a key way;

the transmission device (7) further comprises a box body (71), a first end cover (72), a second end cover (73), a third end cover (74), a fourth end cover (75), a driving gear (78) and a driven gear (79);

2. The stirring mechanism of a vertical stirrer according to claim 1, wherein: the main shaft (1) comprises an outer pipe (11), an inner pipe (12), a water return channel (13), a water inlet channel (14) and a fixed block (15); the axis of the outer tube (11) is along the vertical direction, an outer tube cavity penetrating from the upper end to the lower end of the outer tube (11) is formed in the outer tube (11), and the outer tube cavity and the outer tube (11) are coaxially arranged; the inner tube (12) is fixedly connected in the outer tube cavity and is coaxially arranged with the outer tube (11); a gap formed between the outer side surface of the inner pipe (12) and the inner side surface of the outer pipe (11) is a water return channel (13); a water inlet channel (14) penetrating from the upper end to the lower end of the inner tube (12) is formed in the inner tube (12), and the water inlet channel (14) and the inner tube (12) are coaxially arranged; the inner tube (12) is fixedly connected with the outer tube (11) through the fixing blocks (15), one ends of the fixing blocks (15) are fixedly connected with the outer side face of the inner tube (12), and the other ends of the fixing blocks are fixedly connected with the inner side face of the outer tube (11).

3. The stirring mechanism of a vertical stirrer according to claim 2, wherein: the stirring rake connecting mechanism (2) comprises a main shaft lower end flange (21), a water inlet hole (22), a water return hole (23), a first sealing groove (24) and a second sealing groove (25); the main shaft lower end flange (21) is coaxially arranged with the main shaft (1), and the main shaft lower end flange (21) is fixedly connected to the lower end of the main shaft (1); a water inlet hole (22) penetrating from the top surface to the bottom surface of the main shaft lower end flange (21) is formed in the center of the main shaft lower end flange, and the water inlet hole (22) and the water inlet channel (14) are coaxially arranged and communicated with each other; the main shaft lower end flange (21) is also provided with a plurality of water return holes (23) penetrating from the top surface to the bottom surface, each water return hole (23) is positioned on the outer ring of the water inlet hole and the inner ring of the water return channel (13), each water return hole (23) is uniformly distributed on the outer ring of the water inlet hole (22), and the axes of each water return hole (23) are all along the vertical direction and are communicated with the water return channel (13); a first sealing groove (24) and a second sealing groove (25) are formed in the bottom surface of the lower end flange (21) of the main shaft; the first sealing groove (24) is positioned on the outer ring of the water inlet hole (22) and the inner ring of the water return hole (23), and the second sealing groove (25) is positioned on the outer ring of the water return hole (23); the first sealing groove (24) and the second sealing groove (25) are annular, and a first sealing ring and a second sealing ring are respectively arranged in the first sealing groove (24) and the second sealing groove (25).

4. The stirring mechanism of a vertical stirrer according to claim 2, wherein: the rotary joint connecting mechanism (3) comprises a stop block (31) and a looper flange (32); an annular baffle mounting groove is formed in the outer ring of the upper end of the outer tube (11), the baffle (31) comprises two haffords which are fixedly connected to two sides in the baffle mounting groove respectively, and the outer side surface of the baffle (31) is an inclined surface which is gradually folded inwards from top to bottom; the loose flange (32) is provided with a stop block mounting hole penetrating from the top surface to the bottom surface, and the inner side surface of the stop block mounting hole is an inclined surface matched with the outer side surface of the stop block (31); the movable sleeve flange (32) is sleeved on the outer ring of the stop block (31), the inner side surface of the stop block mounting hole is attached to the outer side surface of the stop block (31), and the stop block (31) and the movable sleeve flange (32) are spliced into a flange structure which is coaxially arranged with the main shaft (1).

5. The stirring mechanism of a vertical stirrer according to claim 4, wherein: the rotary joint (6) comprises a rotary part (61), a fixed part (62), a rotary joint flange (63), a sealing gasket (64), a backwater cavity (65), a backwater port (66), a water inlet (67) and a rotary joint sealing ring (68); the rotating part (61) is arranged below the fixed part (62), and the rotating part (61) is rotationally connected with the fixed part (62); the rotary joint flange (63) is fixedly connected to the lower end of the rotary part (61), the rotary joint flange (63) is fixedly connected with the looper flange (32), and a sealing gasket (64) is arranged between the bottom of the rotary joint flange (63) and the upper end of the outer tube (11); the rotary joint flange (63) is fixedly connected with the looper flange (32), and a sealing gasket is arranged between the bottom of the rotary joint flange (63) and the upper end of the outer tube (11); the inner cavity of the rotating part (61) is communicated with the inner cavity of the fixed part (62) to form the backwater cavity (65), and the central hole of the rotating joint flange (63) is communicated with the backwater cavity (65); the upper part of the inner tube (12) extends into the backwater cavity (65) from the central hole of the rotary joint flange (63), and the inner tube (12) can rotate in the backwater cavity (65); the upper end opening of the backwater channel (13) is communicated with the backwater cavity (65) through a gap between the outer side surface of the inner pipe (12) and the inner side surface of the central hole of the rotary joint flange (63); the water return port (66) is fixedly connected to one side of the fixed part (62), and the water return port (66) is communicated with the water return channel (13) through the water return cavity (65); the water inlet (67) is fixedly connected to the upper part of the fixing part (62), and the water inlet (67) is communicated with the upper end opening of the water inlet channel (14); a plurality of rotary joint sealing rings (68) are arranged at the upper part of the backwater cavity (65) at intervals up and down, each rotary joint sealing ring (68) is sleeved on the outer ring of the upper end of the inner tube (12), and the rotary joint sealing rings (68) are sealed between the water inlet (67) and the backwater cavity (65).

6. A stirring mechanism for a vertical stirrer according to any one of claims 1 to 5, characterized in that: the stirring mechanism of the vertical stirrer further comprises a bracket (5), wherein the bracket (5) comprises a bottom plate (51), a top plate (52), a supporting structure (53), a lower bearing seat (54), an upper bearing seat (55) and a main shaft bearing (56); the bottom plate (51) is horizontally arranged, the top plate (52) is horizontally arranged below the bottom plate (51), through holes with axes along the vertical direction are formed in the centers of the bottom plate (51) and the top plate (52), and the through holes in the bottom plate (51) and the through holes in the top plate (52) are coaxially arranged; the supporting structure (53) is fixedly connected between the bottom plate (51) and the top plate (52); the lower bearing seat (54) is arranged below the bottom plate (51) and is fixedly connected with the bottom plate (51); the upper bearing seat (55) is arranged above the top plate (52) and is fixedly connected with the top plate (52); spindle bearings (56) are respectively arranged in the inner cavities of the lower bearing seat (54) and the upper bearing seat (55), and each spindle bearing (56) is coaxially arranged with a through hole on the bottom plate (51) and a through hole on the top plate (52); the main shaft (1) sequentially passes through the lower bearing seat (54), the through hole on the bottom plate (51), the through hole on the top plate (52), the upper bearing seat (55) and is connected in the bearing holes of all the main shaft bearings (56), the stirring rake connecting mechanism (2) is positioned below the lower bearing seat (54), and the rotary joint connecting mechanism (3) is positioned above the upper bearing seat (55).

7. The stirring mechanism of the vertical stirrer according to claim 6, wherein: the main shaft (1) comprises an outer tube (11), and the axis of the outer tube (11) is along the vertical direction; the outer tube (11) comprises a first step part (111), a second step part (112) and a third step part (113), wherein the first step part (111), the second step part (112) and the third step part (113) are sequentially and fixedly connected from bottom to top, the first step part (111), the second step part (112) and the third step part (113) are all vertically arranged cylinders, the diameters of the cylinders are sequentially reduced, and the first step part (111), the second step part (112) and the third step part (113) are coaxially arranged; the part of the upper end of the first step part (111) protruding out of the outer ring of the second step part (112) is clamped on the outer ring of the lower end opening of the lower bearing seat (54); the part of the upper end of the second step part (112) protruding out of the outer ring of the third step part (113) is clamped at the lower end of the transmission device (7).