CN109251354B

CN109251354B - Desulfurization reaction kettle for waste rubber powder

Info

Publication number: CN109251354B
Application number: CN201810943810.9A
Authority: CN
Inventors: 陈斌; 陈苗烽; 章丹; 屠国根; 王维琴
Original assignee: Shaoxing Daxing Boiler Container Co ltd
Current assignee: Shaoxing Daxing Boiler Container Co ltd
Priority date: 2018-08-18
Filing date: 2018-08-18
Publication date: 2021-06-04
Anticipated expiration: 2038-08-18
Also published as: CN109251354A

Abstract

The invention discloses a desulfurization reaction kettle for waste rubber powder, which comprises a kettle body, a kettle cover, a feeding hole, a feeding hopper, a stirring mechanism, a first driving mechanism for driving the stirring mechanism to rotate and a second driving mechanism for driving the stirring mechanism to move up and down, wherein the stirring mechanism comprises a stirring shaft and stirring slurry fixedly connected with the stirring shaft, the stirring mechanism is provided with a baffle device, and the baffle device comprises a fixed part and a movable part connected with the fixed part through a connecting piece. The stirring mechanism can also move up and down while rotating, so that the materials are mixed more uniformly, the resistance of the movable part on the baffle device in the movement of the materials can be reduced, the materials can be stirred more conveniently while the energy consumption is reduced, and in addition, the stirring mechanism can be driven to move up and down without arranging a power part, so that the reaction kettle has the advantages of simple structure, low energy consumption and low failure rate.

Description

Desulfurization reaction kettle for waste rubber powder

Technical Field

The invention belongs to the technical field of waste rubber regeneration, and particularly relates to a desulfurization reaction kettle for waste rubber powder.

Background

The existing waste rubber regeneration technology generally adopts the following processes: the waste rubber is cleaned and dried, crushed and powdered, sieved, desulfurized, cleaned and dried, refined and finished, and the desulfurization process is an important step in the waste rubber regeneration technology, and generally, waste rubber powder is put into a reaction kettle, is uniformly stirred with a desulfurizing agent and reacts with the desulfurizing agent to realize desulfurization treatment. But the (mixing) shaft in the present reation kettle only stirs the material through rotating, and the degree of consistency that the material mixes is low for the desulfurization effect of crumb rubber powder is relatively poor, finally leads to reclaimed rubber's quality not good, and the resistance that the (mixing) shaft received the material when rotating is great simultaneously, and stirring effect is relatively poor, and the energy consumption is higher simultaneously.

Disclosure of Invention

The invention provides a desulfurization reaction kettle for waste rubber powder, which has the advantages of good stirring effect and low energy consumption and is used for overcoming the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a desulfurization reaction kettle for waste rubber powder comprises a kettle body, a kettle cover arranged above the kettle body, a feeding hole arranged on the kettle cover, a feeding hopper arranged on the kettle cover, a stirring mechanism arranged in the kettle body, a first driving mechanism used for driving the stirring mechanism to rotate and a second driving mechanism used for driving the stirring mechanism to move up and down, wherein the stirring mechanism comprises a stirring shaft and stirring slurry fixedly connected with the stirring shaft; the stirring mechanism is provided with a baffle device, the baffle device comprises a fixed part and two movable parts respectively matched with the fixed part through a connecting piece, and the two movable parts are of V-shaped structures; the first driving mechanism drives the stirring mechanism to rotate in the kettle body to stir the materials, and the stirring mechanism can also realize up-and-down motion under the coordination of the second driving mechanism while rotating, so that the materials in the kettle body can also realize a turbulent flow state in the up-and-down direction, the stable state of the stirring mechanism rotating along the same direction can be damaged, the materials can be moved in different directions, and the contact probability between the materials is increased; secondly, the baffle device is arranged on the stirring mechanism, and the V-shaped structure formed by the movable parts of the baffle device can reduce the movement resistance of the baffle device in the material, so that the baffle device can easily penetrate through the material, the energy consumption is reduced, the material is more conveniently stirred, the collision and contact between the materials can be further increased, the material mixing is more uniform, and the reaction between the waste rubber powder and the desulphurization powder is more sufficient; moreover, the second driving mechanism can directly drive the stirring mechanism to operate in the rotating process without additionally arranging a power driving stirring mechanism to move up and down, so that the reaction kettle has the advantages of simple structure, less energy consumption and low failure rate.

Furthermore, the fixing part comprises a bottom plate, support rods arranged on the bottom plate and support rods arranged above the support rods, and the number of the support rods is at least two; the stability of the baffle device on the stirring mechanism can be improved by matching and connecting the bottom plate, the supporting rods and the supporting rods, so that the impact resistance of the baffle device is improved, and the service life of the baffle device is further prolonged.

Furthermore, the movable part comprises a baffle movably connected with the stay bar and an expansion piece of which one end is connected with the lower part of the baffle, the other end of the expansion piece is fixedly connected to the bottom plate, and the baffle is provided with a corrugated convex piece; the upper end of the baffle is movably connected to the stay bar, the lower end of the baffle is connected with the telescopic piece, the angle of the baffle can be adjusted to a certain degree when the baffle is extruded and collided by materials through the movable arrangement, the baffle can be subjected to smaller resistance and impact force, the movement of the baffle device in the materials is facilitated, meanwhile, the abrasion of the baffle can be reduced, and the service life of the baffle is prolonged; be equipped with the protruding piece of corrugate on the baffle, when the material stream was through protruding piece, can arouse great whirl for the material is by intensive mixing, further improves stirring effect.

Furthermore, the second driving mechanism comprises a base, a rotation stopping insertion part arranged at the lower part of the base, a concave part matched with the insertion part, a track arranged on the base, a convex part arranged at the bottom of the stirring shaft, a gear part arranged on the base and a sealing part, wherein the track is of an annular structure obliquely arranged relative to the base, and the convex part is matched with the track; the track is of an annular structure and is obliquely arranged relative to the base, when the convex part at the bottom of the stirring shaft moves along the track, the stirring mechanism can be driven to move up and down, the stable state of single rotation of the material is broken, the material can move in different directions, and the stirring effect of the material is improved; spline grafting portion and concave part and mutually support, can guarantee that the kettle cover when the lid closes, the base can realize the cooperation of splining with the cauldron body, and then the (mixing) shaft when rotating, the base can not rotate relative to the (mixing) shaft to the convex part can realize that drive rabbling mechanism reciprocates along orbital motion.

Furthermore, the gear mechanism comprises a first gear arranged on the convex part, a second gear meshed with the first gear and a connecting rod matched with the second gear, and the first gear is matched with the convex part through a first bearing; the connecting rod is matched with the base through a second bearing; the convex part can move more conveniently in the track through the matching between the first gear and the second gear, and the convex part does not directly contact with the track in the moving process, so that the abrasion to the inner wall of the track can be reduced, and the service life of the track is prolonged; secondly because first gear is established on the convex part for first gear has certain restriction effect to the convex part, and meshes mutually between first gear and the second gear, and then makes the convex part more firm stable when moving in the track, can realize the steady removal of rabbling mechanism in upper and lower direction.

Furthermore, the sealing component comprises a sealing sleeve, an elastic positioning piece arranged in the sealing sleeve, a first connecting component arranged at one end of the sealing sleeve and a second connecting component arranged at the other end of the sealing sleeve, one end of the elastic positioning piece is fixedly connected with the stirring shaft, and the other end of the elastic positioning piece is fixedly connected with the base; the sealing component is used for preventing materials in the kettle body from entering the track, so that the track of the track is prevented from being blocked after the materials are cooled and hardened, and the operation that the track and the convex part are matched to drive the stirring structure to move up and down can be smoothly carried out; the second driving mechanism is connected with the stirring shaft through the arrangement of the first connecting assembly and the second connecting assembly, so that when the kettle cover is opened, the second driving mechanism and the stirring shaft are lifted up together, and the replacement and maintenance of the second driving mechanism are facilitated; through elastic positioning element's setting, guarantee to have certain rigid connection effect between (mixing) shaft and the base, when the in-process of the cauldron body is returned to the recap after the kettle cover is opened again, the base can not appear moving relative to the (mixing) shaft, avoid the axis of base to break away from the axis of (mixing) shaft, in inserting the recess when guaranteeing the splining grafting portion on the base can be on kettle cover to the cauldron body, compare in the result that only connects through the seal cover, equipment status is more easy, the unable and cauldron body realization of base can not appear and only make the unable condition that uses of equipment.

In conclusion, the beneficial effects of the invention are as follows: the first driving mechanism drives the stirring mechanism to rotate, and simultaneously, the vertical motion can be realized under the coordination of the second driving mechanism, so that the material turning and collision are facilitated, and the uniformity of material mixing is further improved; secondly, the stirring mechanism is provided with a baffle device, and the V-shaped structure formed by movable parts on the baffle device can reduce the resistance of the baffle device in the movement of the material, thereby reducing the energy consumption and being more convenient for stirring the material; moreover, the second driving mechanism can drive the stirring mechanism to move up and down without a power part, so that the reaction kettle has the advantages of simple structure, less energy consumption and low failure rate.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of a point a in fig. 1.

Fig. 3 is an enlarged view at B in fig. 1.

Fig. 4 is an enlarged view at C in fig. 2.

Fig. 5 is an enlarged view at D in fig. 2.

Fig. 6 is a top view of the gear mechanism of fig. 1.

Fig. 7 is a partial schematic view of the agitation mechanism of fig. 1.

Fig. 8 is an enlarged view at E in fig. 7.

Fig. 9 is a schematic cross-sectional view of the baffle arrangement of fig. 7.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

As shown in fig. 1-9, a desulfurization reaction kettle for waste rubber powder comprises a kettle body 1, a kettle cover 2, a feed inlet 3, a feed inlet 4, a stirring mechanism capable of rotating and moving up and down, a first driving mechanism and a second driving mechanism, wherein the kettle body 1 is provided with an opening, the kettle cover 2 can be covered on the kettle body, and further the kettle body 1 is sealed, the first driving mechanism is used for driving the stirring mechanism to rotate, specifically, the first driving device comprises a driving piece 55 and a driving shaft 54, the driving piece 55 is a motor directly purchased from the market, specific structures and principles are not repeated, the upper part of the driving shaft 54 penetrates out of the kettle cover 2 and is connected with the motor, and the driving shaft 54 is driven to rotate by the motor; the stirring mechanism comprises a stirring shaft 51 and a stirring paddle 52, the stirring paddle 52 is welded on the stirring shaft 51, the stirring shaft 51 is in rotation-stopping and anti-falling fit with the driving shaft 54 through a rotation-stopping mechanism, when the driving shaft 54 rotates, the stirring shaft 51 is driven to rotate, and then the stirring shaft 51 drives the stirring paddle 52 to rotate, so that the stirring shaft 51 and the stirring paddle 52 are used for stirring the materials in the kettle body 1 together, the contact area between the stirring mechanism and the materials can be increased, the stirring and collision of the materials are facilitated, and the uniformity of material mixing is further improved; the rotation stopping mechanism comprises rotation stopping convex parts 81, an open slot 82, rotation stopping grooves 83, a sliding groove 541 and a separation preventing part 84, wherein the rotation stopping convex parts 81 are arranged on the outer wall of the driving shaft 54, the rotation stopping convex parts 81 are provided with a plurality of structures, and the rotation stopping convex parts 81 are uniformly arranged at intervals around the outer wall of the driving shaft 54, preferably, the rotation stopping convex parts 81 are bar-shaped convex parts formed by directly and outwardly extending the outer wall of the driving shaft 54, the open slot 82 is arranged on the upper part of the stirring shaft 51 and can be penetrated by the driving shaft 54, the rotation stopping grooves 83 are arranged on the inner wall of the open slot 82, particularly, the bar-shaped convex parts are uniformly arranged on the inner wall of the open slot 82 along the circumferential intervals, when the driving shaft 54 penetrates into the open slot 82, the bar-shaped convex parts are matched with the bar-shaped grooves, so that the rotation stopping matching of the driving shaft and the stirring, and anticreep piece 84 sets up for falling L type structure, and anticreep piece 84 one end leads to set screw with the (mixing) shaft and is connected, and the other end penetrates to spout 541, spout 541 locates the drive shaft outer wall, can prevent that drive shaft 54 from taking place to break away from with (mixing) shaft 51, and when rabbling mechanism reciprocated, the tip of anticreep piece 84 can reciprocate in spout 541, can guarantee that rabbling mechanism reciprocates and can go on smoothly.

Baffle devices 53 are arranged on the stirring shaft 51 and the stirring paddle 52 at intervals, the stirring effect of the stirring mechanism on the materials can be enhanced by the baffle devices 53, and the collision and contact between the materials are further increased, so that the materials are mixed more uniformly. Specifically, the baffle device comprises a fixed part 56 and a movable part 57, wherein the fixed part 56 comprises a bottom plate 531, two support rods 532 and a support rod 536, the bottom plate 531 is fixed on the surface of the stirring shaft 51 or the stirring paddle 52 in a threaded manner, the number of the support rods 532 is two, one end of each support rod 532 is welded on the surface of the bottom plate 531, the distance between the two support rods 532 is smaller than the length of the support rod 536, so that the support rod 536 can be welded on the other end of each support rod 532, and the stability of the baffle device on the stirring mechanism can be improved through the matching arrangement of the bottom plate, the support rods and the support rods, so that the impact resistance of the baffle device is improved, and the service life of the baffle device is further prolonged; the movable component 57 comprises two baffle plates 534 and telescopic parts 533, the two baffle plates 534 are respectively connected to two sides of the brace 536 through connecting parts 537, so that the two baffle plates 534 are in a V-shaped structure, the connecting parts 537 are commercially available stainless steel rounded hinges, the telescopic parts 533 are compression springs, one ends of the compression springs are welded with the bottom plate 531, and the other ends of the compression springs are welded at the lower part of the baffle plates 534, when the baffle plate device rotates and moves up and down along with the stirring mechanism, the V-shaped structure formed by the two baffle plates can reduce the resistance of the baffle plate device in the movement of the material, the stirring mechanism can easily penetrate through the material, and the energy consumption is reduced while the stirring and mixing of the material are facilitated; the upper end of the baffle is movably connected to the stay bar, the lower end of the baffle is connected with the compression spring, the angle of the baffle can be adjusted to a certain degree when the baffle is extruded and collided by materials through the movable arrangement, the baffle can be subjected to smaller resistance and impact force, the movement of the baffle device in the materials is facilitated, meanwhile, the abrasion of the baffle can be reduced, and the service life of the baffle is prolonged; the baffle is welded with a corrugated convex part 535 which is a corrugated metal plate, and when the material flows through the convex part, a larger rotational flow can be caused, so that the material is fully stirred, and the stirring effect is further improved.

The second driving mechanism is used for driving the stirring shaft to move up and down, specifically, the second driving mechanism comprises a base 61, a rail 62, a convex part 63, a gear part and a sealing part, the rail 62 is arranged in a ring structure and is obliquely arranged relative to the base 61, namely, the height of one side of the rail 62 is greater than that of the other side, the convex part 63 is arranged at the bottom of the stirring shaft 51 and is used in cooperation with the rail 62, and when the stirring shaft 51 rotates, the convex part 63 drives the stirring shaft 53 to move upwards during the process of moving from the low side to the high side in the rail 62; when the convex part 63 moves from the high side to the low side in the track 62, the track 62 drives the stirring shaft 51 to move downwards, and then when the stirring shaft 51 rotates relative to the base, the convex part 63 can move along the track 62 to drive the stirring mechanism to move up and down, so that materials in the kettle body can also realize a turbulent flow state in the up-and-down direction, the stable state of the stirring mechanism rotating in the same direction can be destroyed, the materials are mixed more uniformly, and the reaction between the waste rubber powder and the desulphurization powder is more sufficient; in addition, the second driving mechanism can be directly driven to operate in the rotating process of the stirring mechanism, and a power driving stirring mechanism does not need to be additionally arranged to move up and down, so that the energy consumption can be saved, and meanwhile, the reaction kettle has a simple structure and low failure rate; the bottom of the kettle body 1 is provided with a plurality of concave parts 11 which are encircled into a circle, the lower part of the base 61 is provided with a plurality of rotation stopping insertion parts 611, the preferred rotation stopping insertion parts 611 are convex blocks formed by directly extending downwards the lower part of the base, the size and the position of the convex blocks are the same as those of the concave parts 11, and through the matching of the concave parts and the convex blocks, the base can be matched with the kettle body in a rotation stopping way when the end cover is covered, and further, the stirring shaft can rotate relative to the stirring shaft, so that the convex parts can move along the track, and the stirring shaft can be driven to move up and down.

The gear mechanism comprises a first gear 64, a second gear 65 and a connecting rod 67 matched with the second gear 65, specifically, the first bearing 66 is sleeved on the convex part 63, the first gear 64 is sleeved on the first bearing 66, the second bearing 68 is welded on the base 61 and sleeved on one end of the connecting rod 67, the second gear 65 is sleeved on the other end of the connecting rod 67, and the tooth surface of the first gear 64 is meshed with the tooth surface of the second gear 65; through the matching between the first gear 64 and the second gear 65, the convex part 63 can be more conveniently moved in the track 62, and the convex part 63 is not in direct contact with the track 62 in the moving process, so that the abrasion to the inner wall of the track can be reduced, and the service life of the track can be prolonged; secondly, because the first gear 64 is arranged on the convex part 63, the first gear 64 has a certain limiting effect on the convex part, and the first gear 64 and the second gear 65 are meshed with each other, so that the convex part 63 is firmer and more stable when moving in the track 62, and further the stirring mechanism can stably move up and down.

The sealing part is used for preventing the material in the kettle body 1 from entering the rail 62, so as to prevent the material from entering the rail 62, and prevent the material from blocking the track of the rail 62 after cooling and hardening, and ensure that the operation of the rail 62 and the convex part 63 matching with the stirring shaft for moving up and down can be smoothly carried out, concretely, the sealing part comprises a sealing sleeve 71, a first connecting component, a second connecting component and a plurality of elastic positioning parts 72, the sealing sleeve 71 is made of deformable material, specifically is a rubber sleeve made of rubber, the first connecting component is used for realizing the sealing matching between one end of the sealing sleeve 71 and the stirring shaft 51, concretely, the first connecting component comprises a first ring groove 73 and a first locking part 74, the first ring groove 73 is arranged on the stirring shaft, the first locking part 74 is matched with the second ring groove 73, and the first locking part 74 is a C-shaped metal sleeve, the two ends of the metal sleeve are respectively provided with a convex seat, the two convex seats are connected together through a screw, and when the screw is locked, a gap between the two convex seats disappears, so that the sealing sleeve 71 is locked, and in a locking state, part of the sealing sleeve 71 is arranged between the inner wall of the first ring groove 73 and the inner wall of the first locking piece 74; the second connecting assembly is used for realizing the sealing fit between the other end of the sealing sleeve 71 and the base 61, and particularly comprises a second annular groove 75 and a second locking piece 76, the second annular groove 75 is arranged on the base 61, the second locking piece 76 and the second annular groove 75 are matched for use, the second locking piece 76 is also a C-shaped metal sleeve, two ends of the metal sleeve are respectively provided with a convex seat, the two convex seats are connected together through a screw, when the screw is locked, a gap between the two convex seats disappears, so that the sealing sleeve 71 is locked, under a locking state, part of the sealing sleeve 71 is arranged between the inner wall of the second annular groove 75 and the inner wall of the second locking piece 76, through the arrangement of the first connecting assembly and the second connecting assembly, one part of the sealing sleeve can be embedded into the annular groove, and further the firm connection between the sealing piece and the stirring shaft and the base is realized, in addition, the first connecting assembly and the second connecting assembly are arranged to connect the second driving mechanism with the stirring shaft, so that when the kettle cover is opened, the second driving device and the stirring shaft are lifted up together, and the replacement and maintenance of the second driving mechanism are facilitated; the elastic positioning pieces 72 are uniformly distributed along the circumferential direction of the base 61 at intervals, the elastic positioning pieces 72 are elastic pieces made of stainless steel, the middle parts of the elastic pieces protrude outwards to enable the elastic pieces to be of an arc-shaped structure, one end of each elastic piece is connected with the stirring shaft 51 through a screw, the other end of each elastic piece is connected with the base 61 through a screw, and the elastic pieces are arranged in the sealing sleeve 71; through the arrangement of the elastic pieces, a certain rigid connection effect between the stirring shaft and the base is ensured, the base cannot move relative to the stirring shaft in the process of covering the stirring shaft back to the kettle body again after the end cover is opened, the axial line of the base is prevented from being separated from the axial line of the stirring shaft, and the fact that the convex part on the base can be inserted into the rotation stopping insertion groove when the kettle cover is covered on the kettle body is ensured; compared with a structure connected only through a sealing sleeve, the device is easier in state, and the situation that the base cannot be stopped rotating with the kettle body to enable the device to be unusable can not occur.

The feed inlet 3 and the charging hopper 4 are both arranged on the kettle cover 2, the lower part of the feed inlet 3 is connected with the kettle cover 2, and the feed inlet can convey waste rubber powder into the kettle body 1; the lower part of the charging hopper 4 is connected with the kettle cover 2, the charging hopper 4 can be used for placing a desulfurizer, and the desulfurizer is conveyed into the kettle body 1 through the charging hopper 4.

It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a desulfurization reation kettle of abandonment rubber powder, includes the cauldron body (1), locate cauldron lid (2) of cauldron body (1) top, locate feed inlet (3) on cauldron lid (2), locate loading hopper (4) on cauldron lid (2), locate the inside rabbling mechanism of cauldron body (1), be used for driving rabbling mechanism pivoted first actuating mechanism and be used for driving the second actuating mechanism of rabbling mechanism action from top to bottom, its characterized in that: the stirring mechanism comprises a stirring shaft (51) and a stirring paddle (52) fixedly connected with the stirring shaft (51); the stirring mechanism is provided with a baffle device (53), the baffle device (53) comprises a fixed part (56) and two movable parts (57) which are respectively matched with the fixed part (56) through a connecting piece (537), and the two movable parts (57) are of V-shaped structures;

the fixing part (56) comprises a bottom plate (531), supporting rods (532) arranged on the bottom plate (531), and supporting rods (536) arranged above the supporting rods (532), wherein the number of the supporting rods (532) is at least two;

the movable component (57) comprises a baffle plate (534) movably connected with the stay bar (536) and an expansion piece (533) with one end connected with the lower part of the baffle plate (534), the other end of the expansion piece (533) is fixedly connected to the bottom plate (531), and a corrugated convex piece (535) is arranged on the baffle plate (534);

the fixing component (56) comprises a bottom plate (531), a support rod (532) and a support rod (536), wherein the bottom plate (531) is fixed on the surface of the stirring shaft (51) or the stirring paddle (52) in a threaded manner;

the number of the struts (532) is two, one end of each strut (532) is welded on the surface of the bottom plate (531), and the distance between the two struts (532) is smaller than the length of the stay bar (536), so that the stay bar (536) can be welded on the other end of the two struts (532);

a corrugated convex part (535) is welded on the baffle plate, and the convex part is a corrugated metal plate;

the movable part (57) comprises two baffles (534) and telescopic pieces (533), wherein the two baffles (534) are respectively connected to two sides of the support rod (536) through connecting pieces (537), so that the two baffles (534) are in a V-shaped structure;

the second driving mechanism comprises a base (61), a rotation stopping insertion part (611) arranged at the lower part of the base (61), a concave part (11) matched with the insertion part (611), a rail (62) arranged on the base (61), a convex part (63) arranged at the bottom of the stirring shaft (51), a gear part arranged on the base (61) and a sealing part, wherein the rail (62) is of an annular structure obliquely arranged relative to the base (61), and the convex part (63) is matched with the rail (62);

the gear mechanism comprises a first gear (64) arranged on the convex part (63), a second gear (65) meshed with the first gear and a connecting rod (67) matched with the second gear (65), and the first gear (64) is matched with the convex part (63) through a first bearing (66); the connecting rod (67) is matched with the base (61) through a second bearing (68); the sealing component comprises a sealing sleeve (71), an elastic positioning piece (72) arranged on the inner side of the sealing sleeve (71), a first connecting assembly arranged at one end of the sealing sleeve (71) and a second connecting assembly arranged at the other end of the sealing sleeve (71), wherein one end of the elastic positioning piece (72) is fixedly connected with the stirring shaft (51), and the other end of the elastic positioning piece is fixedly connected with the base (61).