Uniform mixing type chemical stirring kettle

Abstract

The invention relates to the technical field of chemical equipment, in particular to a uniform mixing type chemical stirring kettle which comprises a circulating paddle set, a flow guide assembly and a speed regulation assembly. The circulating paddle group is connected with the stirring shaft; the flow guide assembly is connected between the kettle body and the stirring shaft; the speed regulating assembly is connected with the middle-layer stirring paddle; by arranging the circulating paddle group, the upper-layer stirring paddle and the lower-layer stirring paddle, materials flow axially, and the middle-layer stirring paddle enables the materials to flow radially, so that the materials are circularly stirred on the upper layer and the lower layer in the kettle body; materials accumulated at the bottom are uniformly distributed into the two circulations, and when the materials rise, the speed regulating assembly is pushed to slide to change the path length of the upper and lower circulations, so that the aim of regulating the flow speed of the materials in the circulations is achieved, and the stirring uniformity is further improved; the problem of non-uniform stirring caused by slow flow speed of the outer wall of the stirring shaft and the side wall of the kettle body of the stirring kettle is solved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, and in particular to a uniform mixing type chemical stirring kettle. Background Art

[0002] Chemical stirring kettle is a commonly used equipment for mixing, dissolving, reacting and emulsifying materials in chemical production. It mainly uses mechanical stirring to evenly mix the materials, so that the materials produce flow, shear and impact in the kettle, so that the materials can react and contact better; chemical stirring kettle can also meet different production processes and meet the processing requirements of different materials by adjusting pressure, temperature, etc.

[0003] When a chemical reactor is stirring, it is necessary to ensure that the material can be evenly distributed to ensure the mixing effect or reaction effect; however, when the material is stirred, due to the spacing between the stirring paddles and the spacing between the stirring paddles and the bottom of the stirring kettle, the material flow rate near the stirring shaft and the bottom of the stirring kettle will be slow, resulting in a stirring dead angle and uneven stirring. In view of the above problems, the prior art has proposed a solution. Patent publication number CN107233857B is a reactor that achieves full stirring. A cylinder is arranged on the outside of the stirring kettle, so that the stirring kettle can be pushed in the horizontal direction and the vertical direction, and the stirring mechanism inside is cooperated for stirring, stirring from both the inside and the outside, so as to ensure that the material is stirred evenly and avoid dead angles.

[0004] Although the existing technology has solved the problem that the stirring paddle cannot fully stir the material in the dead corner, the following problems still exist: when the stirred material needs to be stirred and reacted under high temperature or high pressure conditions, using a mechanism outside the stirring kettle to vibrate it will cause unstable pressure of the equipment, resulting in the equipment being in a dangerous state. For high-viscosity or high-density materials, although external vibration can cause a certain amount of movement of the material accumulated in the dead corner, the flow rate of the fluid in the dead corner is not significantly changed. At this time, the dead corner will still be deposited in the dead corner due to the gravity of the material itself and the centrifugal force of the stirring paddle, and the vortex originally generated by the stirring paddle will be destroyed under the vibration force, resulting in a more complicated flow state, generating eddy currents or shear flows. When mutually offsetting forces are formed in a certain area, new dead corners will be generated, resulting in uneven stirring.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention proposes a uniform mixing type chemical stirring kettle. Summary of the invention

[0006] The present invention provides a uniform mixing chemical stirring kettle, which solves the problem of uneven stirring caused by slow flow rate at the outer wall of the stirring shaft and the side wall of the kettle. By setting a circulating paddle group, the upper stirring paddle and the lower stirring paddle make the material flow axially, and the middle stirring paddle makes the material flow radially, so that the material forms a circulating stirring in the upper and lower layers of the kettle body, and the upper and lower layers of the circulation are connected by the guide component, and the material accumulated at the bottom is evenly distributed to the two circulations. When the material rises, it will push the speed regulating component to slide, thereby changing the path length of the upper and lower layers of the circulation, so as to achieve the purpose of adjusting the material flow rate in the circulation, and then improve the stirring uniformity.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A uniform mixing chemical stirring kettle, comprising a kettle body, a motor and a stirring shaft; further comprising a circulating paddle group, a flow guide component and a speed regulating component; the circulating paddle group comprises an upper stirring paddle, a middle stirring paddle and a lower stirring paddle; the upper stirring paddle is connected to the stirring shaft; the middle stirring paddle is arranged below the upper stirring paddle; the lower stirring paddle is arranged below the middle stirring paddle; the flow guide component is connected between the kettle body and the stirring shaft; the speed regulating component is connected to the middle stirring paddle; the stirring shaft rotates to drive the circulating paddle group to rotate, and the middle stirring paddle divides the kettle body into an upper stirring paddle and a lower stirring paddle; the upper stirring paddle is connected to the stirring shaft; the middle stirring paddle is connected to the lower stirring paddle; the lower stirring paddle is connected to the middle stirring paddle; the lower stirring paddle is connected to the middle stirring paddle; the lower stirring paddle is connected to the upper stirring paddle and the middle stirring paddle; the lower stirring paddle is connected to ... The upper and lower stirring paddles drive the materials to rotate in two cycles in the formed double-layer structure. Part of the materials pushed upward by the lower stirring paddle passes through the middle stirring paddle along the outer wall of the stirring shaft to reach the position of the upper stirring paddle. The rotation of the middle stirring paddle pushes part of the materials into the guide assembly. The materials entering the guide assembly are discharged from the top and bottom of the kettle body and the upper and lower stirring paddles. The upper and lower stirring paddles drive the material flow to push the speed regulating assembly. The sliding of the speed regulating assembly drives the middle stirring paddle to slide and adjust the height of the upper and lower layers.

[0009] Preferably, the upper stirring paddle is a six-fold blade vortex structure; the middle stirring paddle is arranged below the upper stirring paddle and is a six-straight blade disc vortex structure; the lower stirring paddle has the same structure as the upper stirring paddle.

[0010] In the above scheme, the middle-layer stirring paddle can promote the radial flow of the material, while the upper-layer stirring paddle and the lower-layer stirring paddle can promote the axial flow of the material. At this time, two circulations will be formed in the kettle, namely, a circulation above the middle-layer stirring paddle and a circulation below the middle-layer stirring paddle. Since the upper-layer stirring paddle and the lower-layer stirring paddle can make the material form an axial flow, the fluidity of the material near the stirring shaft and the side wall can be improved. If the distance between the stirring paddles is directly reduced and multiple layers of stirring paddles are used, the dead angle can be reduced to a certain extent, but the distance between each layer of stirring paddles will be too small, and the material will be difficult to flow, thereby reducing the mixing effect. On the other hand, it will cause excessive turbulence and shear force, thereby causing bubbles, emulsification or particle breakage in the material, thereby reducing the uniformity and mixing quality of the mixture.

[0011] Preferably, the upper stirring paddle includes a turntable and a folding blade paddle; the turntable is connected to the stirring shaft; the folding blade paddle is connected to the turntable, and the angle between the folding blade paddle and the axis of the stirring shaft is 45 degrees; the middle stirring paddle includes a separating disc and a straight blade paddle; the separating disc is connected to the stirring shaft; the straight blade paddle is connected to the separating disc.

[0012] In the above scheme, since the angle formed between the folding blade paddle and the axis of the stirring shaft is between 20 degrees and 45 degrees, the folding blade paddle can drive the material to move axially upward, and at 45 degrees, the axial speed can be maximized and the radial influence can be reduced; and since the lower stirring paddle and the upper stirring paddle have the same structure, they can also drive the material to move upward. At this time, the material can be prevented from settling to the bottom under gravity, and the rising material will move radially when it reaches the top of the liquid surface, and descend from the inner wall of the kettle to complete the cycle.

[0013] Preferably, the distance between the upper stirring paddle and the middle stirring paddle is D1, and the distance from the upper stirring paddle to the top of the liquid surface is D2; the distance between the middle stirring paddle and the lower stirring paddle is D3, and 1.1 to 1.2D3 is equal to D1; the distance from the lower stirring paddle to the bottom of the kettle body is D4, and D4 is equal to D2.

[0014] In the above scheme, since both the upper circulation and the lower circulation are counterclockwise circulation, the movement of the material in the radial direction of the middle-layer stirring paddle will cause convection with the upper circulation, resulting in a reduction in the speed of the upper circulation. By controlling the distance between the upper-layer stirring paddle and the middle-layer stirring paddle to be slightly smaller than the distance between the middle-layer stirring paddle and the lower-layer stirring paddle, the influence of the middle-layer stirring paddle on the speed of the upper circulation can be reduced. The distance from the lower-layer stirring paddle to the bottom of the kettle body is equal to the distance from the upper-layer stirring paddle to the top of the liquid surface, so that the axial speeds of the upper and lower circulations are almost the same, thereby ensuring the uniformity of mixing of the upper and lower layers.

[0015] Preferably, the guide assembly includes a guide groove, an ascending channel and an annular cavity; the guide groove is opened on the inner wall of the kettle body, and the height of the top of the guide groove is on the same horizontal plane as the upper end surface of the middle-layer stirring paddle; the ascending channel is opened inside the stirring shaft; the annular cavity is connected to the ascending channel, and an acceleration hole is opened in a circular array on the outer ring of the annular cavity.

[0016] In the above scheme, since the middle-layer stirring paddle increases the radial velocity of the material, the material will hit the wall and flow in both directions up and down, which will cause the lower circulation to accelerate and the upper circulation to decelerate. After the guide groove is opened, part of the material will enter the guide groove and flow out from the top of the material liquid surface through the ascending channel and the annular cavity, thereby increasing the mixing uniformity of the surface material and enabling the material circulation speed in the upper circulation to be increased, further ensuring the uniformity of material mixing.

[0017] Preferably, the inner surface of the separating disc is provided with material guiding holes; and circulation holes are provided in a circular array between the inner wall of the bottom of the kettle body and the guide groove.

[0018] In the above scheme, in the lower circulation, the circulation hole can avoid dead corners at the bottom, and the material flowing out of the circulation hole is in the same direction as the lower circulation, which will avoid the accumulation of materials at the bottom, and the lower circulation can drive the lower material to move upward, and the two circulations can be connected through the material guide holes. At this time, part of the material can rise through the guide holes, and part of the material descending from the edge in the upper circulation will enter the lower circulation, so that the two circulations are connected, which is beneficial to the material exchange between the top and bottom of the kettle, so that the uniformity of material mixing in the two circulations is the same.

[0019] Preferably, a material guiding channel is provided between the rotating disk and the ascending channel; a mixing hole is provided on a surface of one side of the folding blade paddle; and the mixing hole is connected to the material guiding channel.

[0020] In the above scheme, since the folding blade paddles of the upper stirring paddle and the lower stirring paddle are respectively located in the middle position of the upper circulation and the lower circulation, the centrifugal force generated by the folding blade paddle during rotation will discharge part of the material that enters the ascending channel from the guide groove, and since the material will undergo mixing movement in the circulation after being discharged, the mixing degree of the material can be further improved.

[0021] Preferably, the speed regulation assembly includes a locking gear, a connecting block and an adjusting spring; the locking gear is connected to the stirring shaft; the inner ring of the separating disc is provided with a locking gear ring matching the locking gear; the connecting block is rotatably mounted on the stirring shaft; the adjusting spring is connected between the separating disc and the connecting block.

[0022] In the above scheme, when the flow rate of the lower layer is too fast, it will produce a certain impact force on the separating disc of the middle layer stirring paddle. At this time, the middle layer stirring paddle will slide under the action of the adjusting spring, and the height of the middle layer stirring paddle will change. By adjusting the height of the upper and lower layers, when the height of the upper layer is reduced and the height of the lower layer is increased, the length of the upper layer circulation path can be shortened and the length of the lower layer circulation path can be increased, thereby increasing the upper layer circulation speed and slowing down the lower layer circulation speed. When the speeds of the two are the same, the middle layer will maintain the rotation at this height, thereby ensuring the uniformity of stirring.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. Compared with the existing stirring kettle, the present invention provides a circulating paddle group, wherein the upper stirring paddle and the lower stirring paddle are of folding blade structure, so that the material flows axially, and the middle stirring paddle is of straight blade disc structure, so that the material flows radially and the material in the kettle is stratified, so that the material forms a circulating stirring in the upper and lower layers of the kettle, thereby improving the uniformity of material mixing, and the separating disc of the middle stirring paddle is provided with a material guide hole, so that the upper circulation and the lower circulation are kept in a connected state, on the one hand, the uniformity of mixing between the upper circulation and the lower circulation is improved, so that the concentration of the upper and lower layers of materials is the same, and the sedimentation of the materials under gravity is avoided, and on the other hand, when the material of the lower circulation enters the material of the upper circulation, the speeds of the two circulations will be close, thereby further improving the uniformity of mixing.

[0025] 2. The present invention sets a guide component so that the middle-layer stirring paddle drives a part of the material to the side wall position through centrifugal force and then enters the guide groove, and is discharged from the top, bottom, upper and lower stirring paddles of the kettle body through the guide groove. On the one hand, the material that reaches the side wall and collides with it under the action of centrifugal force will rebound and convect with the upper circulation, causing the upper circulation to slow down, and entering the guide groove can avoid the rebound phenomenon, thereby ensuring the normal progress of the upper circulation, improving the mixing uniformity, and avoiding the occurrence of dead corners; on the other hand, the material discharged from the top and bottom of the kettle body can speed up the slow flow position of the material, so that the mixing uniformity of the materials in the two circulations is improved, and the upper and lower stirring paddles discharge the material from the center of the circulation, so that the material can be fully mixed after entering the circulation to ensure mixing, and ensure that the material is evenly distributed in the entire kettle body.

[0026] 3. The present invention sets a speed regulating component to ensure the overall circulation speed of the upper and lower circulations and improve the uniformity of mixing. When the flow rate of the lower layer is too fast, it will produce a certain impact force on the middle-layer stirring paddle. At this time, the middle-layer stirring paddle will slide under the action of the adjusting spring, and the height of the middle-layer stirring paddle will change. By adjusting the heights of the upper and lower layers, when the height of the upper layer is reduced and the height of the lower layer is increased, the length of the upper circulation path can be shortened and the length of the lower circulation path can be increased, thereby increasing the upper circulation speed and slowing down the lower circulation speed. When the speeds of the two are the same, the middle layer will maintain rotation at this height, thereby ensuring the uniformity of mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is the overall structure diagram of the present invention;

[0029] Figure 2 is a cross-sectional view of the present invention;

[0030] Figure 3 is a three-dimensional cross-sectional view of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the middle-layer stirring paddle of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the upper stirring paddle of the present invention;

[0033] Figure 6 yes Figure 2 A magnified view of the structure at center;

[0034] Figure 7 yes Figure 2 A magnified view of the structure at B in the middle;

[0035] Figure 8 is a cross-sectional view of a stirring shaft of the present invention;

[0036] Fig. 9 It is a material circulation flow diagram in the kettle of the present invention;

[0037] In the figure: 1. kettle body; 2. motor; 3. stirring shaft; 4. circulation paddle group; 41. upper stirring paddle; 411. turntable; 4111. material guide channel; 412. folding blade paddle; 4121. mixing hole; 42. middle stirring paddle; 421. separation disc; 4211. material guide hole; 4212. engaging gear ring; 422. straight blade paddle; 43. lower stirring paddle; 5. flow guide assembly; 51. flow guide groove; 511. circulation hole; 52. rising channel; 53. annular cavity; 531. acceleration hole; 6. speed regulating assembly; 61. engaging gear; 62. connecting block; 63. adjusting spring. DETAILED DESCRIPTION

[0038] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] See also Figures 1 to 9 The present invention provides a uniform mixing chemical stirring kettle, and the technical scheme is as follows:

[0040] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2 A uniform mixing chemical stirring kettle, comprising a kettle body 1, a motor 2 and a stirring shaft 3; further comprising a circulating paddle group 4, a flow guide component 5 and a speed regulating component 6; the circulating paddle group 4 comprises an upper stirring paddle 41, a middle stirring paddle 42 and a lower stirring paddle 43; the upper stirring paddle 41 is connected to the stirring shaft 3; the middle stirring paddle 42 is arranged below the upper stirring paddle 41; the lower stirring paddle 43 is arranged below the middle stirring paddle 42; the flow guide component 5 is connected between the kettle body 1 and the stirring shaft 3; the speed regulating component 6 is connected to the middle stirring paddle 42; the stirring shaft 3 rotates to drive the circulating paddle group 4 to rotate, and the middle stirring paddle 42 rotates the kettle body 1 is divided into an upper and lower layer, and an upper stirring paddle 41 and a lower stirring paddle 43 drive the material to rotate in two cycles in the formed double-layer structure. Part of the material pushed upward by the lower stirring paddle 43 passes through the middle stirring paddle 42 along the outer wall of the stirring shaft 3 to reach the position of the upper stirring paddle 41. The middle stirring paddle 42 rotates to push part of the material into the guide component 5. The material entering the guide component 5 is discharged from the top and bottom of the kettle body 1 and the upper stirring paddle 41 and the lower stirring paddle 43. The upper stirring paddle 41 and the lower stirring paddle 43 drive the material to flow and push the speed regulating component 6. The speed regulating component 6 slides to drive the middle stirring paddle 42 to slide and adjust the height of the upper and lower layers.

[0041] As a specific embodiment of the present invention, refer to Figure 3 , Figure 4 and Figure 5, the upper stirring paddle 41 is a six-fold blade vortex structure; the middle stirring paddle 42 is arranged below the upper stirring paddle 41 and is a six-straight blade disc vortex structure; the lower stirring paddle 43 has the same structure as the upper stirring paddle 41. The middle stirring paddle 42 can promote the radial flow of the material, while the upper stirring paddle 41 and the lower stirring paddle 43 can both promote the axial flow of the material. At this time, two circulations will be formed in the kettle body 1, that is, one circulation is formed above the middle stirring paddle 42, and one circulation is formed below the middle stirring paddle 42. Since the upper stirring paddle 41 and the lower stirring paddle 43 can make the material form an axial flow, the fluidity of the material near the stirring shaft 3 and the side wall can be improved at this time; if the distance between the stirring paddles is directly reduced and multiple layers of stirring paddles are used, although the dead angle can be reduced to a certain extent, the distance between each layer of stirring paddles will be too small, making it difficult for the material to flow, resulting in a decrease in the mixing effect. On the other hand, it will cause excessive turbulence and shear force, thereby causing the material to generate gas. Bubbles, emulsification or particle breakage will reduce the uniformity and mixing quality of the mixture; if all the agitators are axial flow type, the speed at the top of the material and the top of the material will be too slow, resulting in uneven mixing; if all the agitators are radial flow type, the gaps between each layer of agitators will not be able to be fully mixed, and increasing the number of agitator paddles will cause excessive rotational resistance and large shear force on the material. If the upper and lower layers are radial flow type and the middle layer is axial flow type, it will be difficult for the middle layer to form a complete circulation flow for the whole body due to the overall high height of the kettle body 1. In addition, this combination will not be able to affect the material in the middle layer because the upper and lower layers cannot affect the material in the middle layer. At this time, the middle layer is only slow under the action of axial flow, and the mixing effect is insufficient. In addition, swirling will occur in the middle layer, which is not conducive to normal stirring.

[0042] As a specific embodiment of the present invention, refer to Figure 5 and Fig. 9 The upper stirring paddle 41 includes a turntable 411 and a folding blade paddle 412; the turntable 411 is connected to the stirring shaft 3; the folding blade paddle 412 is connected to the turntable 411, and the angle between the folding blade paddle 412 and the axis of the stirring shaft 3 is 45 degrees; the middle stirring paddle 42 includes a separating disc 421 and a straight blade paddle 422; the separating disc 421 is connected to the stirring shaft 3; the straight blade paddle 422 is connected to the separating disc 421. Since the angle formed between the folding paddle 412 and the axis of the stirring shaft 3 is between 20 degrees and 45 degrees, the folding paddle 412 can drive the material to move axially upward, and at 45 degrees, the axial speed can be maximized and the radial influence can be reduced; and since the lower stirring paddle 43 and the upper stirring paddle 41 have the same structure, they can also drive the material to move upward, which can prevent the material from settling to the bottom under gravity, and the rising material will move radially when reaching the top of the liquid surface, and descend from the inner wall of the kettle body 1 to complete the cycle.

[0043] As a specific embodiment of the present invention, refer to Fig. 9 , the distance between the upper stirring paddle 41 and the middle stirring paddle 42 is D1, and the distance from the upper stirring paddle 41 to the top of the liquid surface is D2; the distance between the middle stirring paddle 42 and the lower stirring paddle 43 is D3, and 1.1-1.2D3 is equal to D1; the distance from the lower stirring paddle 43 to the bottom of the kettle body 1 is D4, and D4 is equal to D2. Since both the upper and lower circulations are counterclockwise, the movement of the material in the radial direction of the middle stirring paddle 42 will cause convection with the upper circulation, resulting in a reduction in the speed of the upper circulation. By controlling the distance between the upper stirring paddle 41 and the middle stirring paddle 42 to be slightly smaller than the distance between the middle stirring paddle 42 and the lower stirring paddle 43, the influence of the middle stirring paddle 42 on the upper circulation speed can be reduced. The distance from the lower stirring paddle 43 to the bottom of the kettle body 1 is equal to the distance from the upper stirring paddle 41 to the top of the liquid surface, so that the axial speeds of the upper and lower circulations are almost the same, thereby ensuring the uniformity of mixing of the upper and lower layers.

[0044] As a specific embodiment of the present invention, refer to Figure 3 , Figure 6 and Fig. 9 , the flow guide assembly 5 includes a flow guide groove 51, an ascending channel 52 and an annular cavity 53; the flow guide groove 51 is provided on the inner wall of the kettle body 1, and the top height of the flow guide groove 51 is at the same horizontal plane as the upper end surface of the middle-layer stirring paddle 42; the ascending channel 52 is provided inside the stirring shaft 3; the annular cavity 53 is connected to the ascending channel 52, and an acceleration hole 531 is provided in the outer circumferential array of the annular cavity 53. Since the radial velocity of the material is increased by the middle-layer stirring paddle 42, the material will hit the wall and flow in both directions, which will cause the lower layer circulation to accelerate and the lower layer circulation to decelerate. When the flow guide groove 51 is provided, a part of the material will enter the flow guide groove 51 and flow out from the top of the material liquid surface through the ascending channel 52 and the annular cavity 53, thereby increasing the mixing degree of the surface material, and can increase the material circulation speed in the upper layer circulation, further ensuring the mixing uniformity of the material.

[0045] As a specific embodiment of the present invention, refer to Figure 4 , Figure 8 and Fig. 9, the inner surface of the separating disc 421 is provided with a material guide hole 4211; the inner wall of the bottom of the kettle body 1 is provided with a circular array of circulation holes 511 between the guide groove 51. In the lower circulation, the circulation holes 511 can avoid the dead corner area at the bottom, and the material flowing out of the circulation holes 511 will avoid the accumulation of materials at the bottom in the same direction as the lower circulation, and the lower circulation can drive the lower material to move upward. The two circulations can be connected through the material guide holes 4211. At this time, a part of the material can rise through the guide holes, and a part of the material descending from the edge in the upper circulation will enter the lower circulation, so that the two circulations are connected, which is conducive to the material exchange between the top and the bottom of the kettle, so that the uniformity of material mixing in the two circulations is the same.

[0046] As a specific embodiment of the present invention, refer to Figure 5 and Figure 8 A material guiding channel 4111 is provided between the turntable 411 and the ascending channel 52. At the position where the material guiding channel 4111 is connected to the stirring shaft 3, a hole that can penetrate the material guiding channel 4111 and the ascending channel 52 is provided on the stirring shaft 3, so that the stirring shaft 3 can drive the upper stirring paddle 41 and the lower stirring paddle 43 while guiding the material in the ascending channel 52 thereto; a mixing hole 4121 is provided on the surface of one side of the folding paddle 412, and the mixing holes 4121 are evenly filled in an array and are provided on the surface of the folding paddle 412 to further ensure the uniformity of material distribution; the mixing hole 4121 is connected to the material guiding channel 4111. Since the folding paddles 412 of the upper stirring paddle 41 and the lower stirring paddle 43 are respectively located in the middle position of the upper circulation and the lower circulation, the centrifugal force generated by the folding paddle 412 during rotation will discharge part of the material that has entered the ascending channel 52 from the guide groove 51, and since the material will be mixed in the circulation after being discharged; in order to ensure that all the materials in the kettle body 1 can be discharged smoothly after use, a channel for material discharge can be opened at the bottom of the kettle body 1, and after all the materials in the guide groove 51 are discharged, the stirring shaft 3 drives the upper stirring paddle 41 and the lower stirring paddle 43 to continue to rotate to throw out all the internal materials. In order to ensure the cleaning effect, clean water is added to the kettle body 1 after the materials are discharged, and the stirring shaft 3 drives the circulating paddle group 4 to rotate, and the stirring cycle and centrifugal action are used to complete the overall cleaning of the kettle body 1.

[0047] As a specific embodiment of the present invention, refer to Figure 4 , Figure 7 and Figure 8The speed regulating assembly 6 comprises a locking gear 61, a connecting block 62 and an adjusting spring 63; the locking gear 61 is connected to the stirring shaft 3; the inner ring of the separating disc 421 is provided with a locking gear ring 4212 which matches the locking gear 61, and the thickness of the locking gear 61 is thicker than the thickness of the locking gear ring 4212, and it is ensured that after the middle-layer stirring paddle 42 slides up and down, the locking gear 61 and the locking gear ring 4212 can still maintain meshing, so that the stirring shaft 3 can drive the middle-layer stirring paddle 42 to rotate, and at the same time, in order to ensure that the material will not cause the relative sliding between the locking gear 61 and the locking gear ring 4212 and be stuck, a sealing structure can be added at the outer ring position of the adjusting spring 63 to prevent the material from entering the locking gear 61 position; the connecting block 62 is rotatably installed on the stirring shaft 3; the adjusting spring 63 is connected between the separating disc 421 and the connecting block 62. When the flow rate of the lower layer is too fast, it will produce a certain impact force on the separating disc 421 of the middle layer stirring paddle 42. At this time, the middle layer stirring paddle 42 will slide under the action of the adjusting spring 63, and the height of the middle layer stirring paddle 42 will change. By adjusting the height of the upper and lower layers, when the height of the upper layer is reduced and the height of the lower layer is increased, the length of the upper layer circulation path can be shortened and the length of the lower layer circulation path can be increased, thereby increasing the upper layer circulation speed and slowing down the lower layer circulation speed. When the speeds of the two are the same, the middle layer will maintain the rotation at this height, thereby ensuring the uniformity of stirring.

[0048] Working process: the motor 2 starts to drive the stirring shaft 3 to rotate, the stirring shaft 3 drives the circulating paddle group 4 to rotate, the circulating paddle group 4 forms two stirring cycles in the kettle body 1 to improve the stirring uniformity, the middle stirring paddle 42 rotates to send part of the material to the guide component 5, so that the material flows out from the mixing holes 4121 on the top and bottom of the liquid surface, the upper stirring paddle 41 and the lower stirring paddle 43, thereby ensuring the flow rate of the stirring cycle and the uniformity of material distribution.

[0049] Specifically, in order to make the material flow at a uniform speed in the kettle body 1 without a stirring dead angle, the circulation paddle group 4 is driven to rotate by the stirring shaft 3, the upper stirring paddle 41 and the lower stirring paddle 43 make the material flow axially, and the middle stirring paddle 42 makes the material flow radially and divides the kettle body 1 into upper and lower layers through the separation disk 421. Fig. 9 At this time, the upper and lower layers will form a circulation flow under the stirring action of the upper stirring paddle 41 and the lower stirring paddle 43 respectively, and the circulating flow will drive the material below upward along the stirring shaft 3 to prevent the material from accumulating at the bottom of the kettle body 1 under the action of gravity;

[0050] In order to make the flow rate of the materials in the upper and lower circulations the same and avoid the slow flow rate and uneven stirring of the top and bottom of the materials, when the middle stirring paddle 42 swings the materials to the inner wall of the kettle body 1, the materials will not rebound due to the impact of the centrifugal force on the inner wall of the kettle body 1, but will enter the guide groove 51. A part of the materials entering the guide groove 51 will be discharged from the circulation hole 511 under the action of centrifugal pressure and gravity, and the flow of the materials at the bottom of the kettle body 1 will be accelerated, so that the materials in the lower circulation can rise smoothly to avoid accumulation. A part of the materials entering the ascending channel 52 through the guide groove 51 enters the upper stirring paddle 41 and the lower stirring paddle 43 through the material guide channel 4111, and is rotated and discharged by the mixing holes 4121 on the surfaces of the upper stirring paddle 41 and the lower stirring paddle 43, so as to be evenly distributed in the two circulations, and the materials entering the annular cavity 53 through the ascending channel 52 will be discharged from the acceleration hole 531, which increases the flow rate of the top surface of the materials and ensures the mixing effect of the top surface of the materials.

[0051] In order to ensure that the material density and circulation flow rate between the upper circulation and the lower circulation are the same, when the lower stirring paddle 43 makes the lower material circulate, a part of the material will enter the upper circulation through the material guide hole 4211 on the dividing disc 421, so that the materials in the upper and lower circulations are circulated, so that the material density in the two circulations is the same; when the flow rate of the lower layer is too fast, it will produce a certain impact force on the dividing disc 421 of the middle stirring paddle 42. At this time, the middle stirring paddle 42 will slide under the action of the adjusting spring 63, and the height of the middle stirring paddle 42 changes. By adjusting the height of the upper and lower layers, when the height of the upper layer is reduced and the height of the lower layer is increased, the length of the upper circulation path can be shortened and the length of the lower circulation path can be increased, thereby increasing the upper circulation speed and slowing down the lower circulation speed. When the speeds of the upper and lower circulations of the dividing disc 421 are the same, the upper and lower pressures of the dividing disc 421 are the same, and the middle stirring paddle 42 will rotate at this height, thereby ensuring the uniformity of stirring.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A uniform mixing chemical stirring kettle, comprising a kettle body (1), a motor (2) and a stirring shaft (3); characterized in that: The invention also comprises a circulation paddle group (4), a flow guide component (5) and a speed regulating component (6); the circulation paddle group (4) comprises an upper stirring paddle (41), a middle stirring paddle (42) and a lower stirring paddle (43); the upper stirring paddle (41) is connected to the stirring shaft (3); the middle stirring paddle (42) is arranged below the upper stirring paddle (41); the lower stirring paddle (43) is arranged below the middle stirring paddle (42); the flow guide component (5) is connected between the kettle body (1) and the stirring shaft (3); the speed regulating component (6) is connected to the middle stirring paddle (42); the stirring shaft (3) rotates to drive the circulation paddle group (4) to rotate, the middle stirring paddle (42) divides the kettle body (1) into two layers, the upper stirring paddle (41) and the lower stirring paddle (43) are arranged below the middle stirring paddle (42); The upper and lower stirring paddles (41) and the lower stirring paddle (43) drive the materials to form two different circulations in the formed double-layer structure for flow. Part of the materials pushed upward by the rotation of the lower stirring paddle (43) pass through the middle stirring paddle (42) along the outer wall of the stirring shaft (3) to reach the position of the upper stirring paddle (41). The middle stirring paddle (42) rotates to push part of the materials into the guide assembly (5). The materials entering the guide assembly (5) are discharged from the top and bottom of the kettle body (1) and the upper stirring paddle (41) and the lower stirring paddle (43). When the upper stirring paddle (41) and the lower stirring paddle (43) drive the materials to flow, they push the speed regulating assembly (6). The speed regulating assembly (6) slides to drive the middle stirring paddle (42) to slide and adjust the height of the upper and lower layers.

2. A uniform mixing chemical stirring kettle according to claim 1, characterized in that: The upper stirring paddle (41) is a six-fold blade vortex structure; the middle stirring paddle (42) is a six-straight blade disc vortex structure; and the lower stirring paddle (43) has the same structure as the upper stirring paddle (41).

3. A uniform mixing chemical stirring kettle according to claim 2, characterized in that: The upper stirring paddle (41) comprises a rotating disk (411) and a folding blade paddle (412); the rotating disk (411) is connected to the stirring shaft (3); the folding blade paddle (412) is connected to the rotating disk (411), and the angle between the folding blade paddle (412) and the axis of the stirring shaft (3) is 45 degrees; the middle stirring paddle (42) comprises a separating disk (421) and a straight blade paddle (422); the separating disk (421) is connected to the stirring shaft (3); and the straight blade paddle (422) is connected to the separating disk (421).

4. A uniform mixing chemical stirring kettle according to claim 2, characterized in that: The distance between the upper stirring paddle (41) and the middle stirring paddle (42) is D1, and the distance from the upper stirring paddle (41) to the top of the liquid surface is D2; the distance between the middle stirring paddle (42) and the lower stirring paddle (43) is D3, and (1.1-1.2) D3 is equal to D1; the distance from the lower stirring paddle (43) to the bottom surface of the kettle body (1) is D4, and D4 is equal to D2.

5. The uniform mixing chemical stirring kettle according to claim 3, characterized in that: The flow guide assembly (5) comprises a flow guide groove (51), an ascending channel (52) and an annular cavity (53); the flow guide groove (51) is provided on the inner wall of the kettle body (1), and the top height of the flow guide groove (51) is located at the same horizontal plane as the upper end surface of the middle stirring paddle (42); the ascending channel (52) is provided inside the stirring shaft (3); the annular cavity (53) is connected to the ascending channel (52), and an acceleration hole (531) is provided in a circular array on the outer ring of the annular cavity (53).

6. A uniform mixing chemical stirring kettle according to claim 5, characterized in that: The inner surface of the separating disc (421) is provided with material guide holes (4211); and circulation holes (511) are provided in a circular array between the inner wall of the bottom of the kettle body (1) and the guide groove (51).

7. A uniform mixing chemical stirring kettle according to claim 6, characterized in that: A material guiding channel (4111) is provided between the rotating disk (411) and the ascending channel (52); a material mixing hole (4121) is provided on a surface of one side of the folding blade paddle (412); and the material mixing hole (4121) is communicated with the material guiding channel (4111).

8. The uniform mixing chemical stirring kettle according to claim 6, characterized in that: The speed regulating assembly (6) comprises a locking gear (61), a connecting block (62) and an adjusting spring (63); the locking gear (61) is connected to the stirring shaft (3); the inner ring of the separating disc (421) is provided with a locking gear ring (4212) matching the locking gear (61); the connecting block (62) is rotatably mounted on the stirring shaft (3); and the adjusting spring (63) is connected between the separating disc (421) and the connecting block (62).

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