Double-shaft spiral stirrer

Abstract

The invention relates to the technical field of stirring equipment, and provides a double-shaft spiral stirrer which comprises a stirring pool used for bearing materials and two stirring shafts rotationally arranged in the stirring pool, stirring fan blades are obliquely arranged on the stirring shafts, and the inclination angles of the stirring fan blades on the two stirring shafts are opposite. And the materials in the stirring pool are driven by the oppositely arranged stirring fan blades to form circular flow in the horizontal plane. According to the technical scheme, the problems that in the related technology, when multiple materials are mixed, the materials are fed in a concentrated mode, the blades rotate along with the shaft, local materials are mixed uniformly, but overall mixing is not uniform are solved. By means of the distribution design of the stirring fan blades on the two stirring shafts, the material mixing uniformity is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of mixing equipment, and more specifically, to a double-shaft spiral agitator. Background Art

[0002] A mixer, also known as an agitator, is generally used in construction projects to mix building materials such as cement, sand, gravel, and various dry mortar. It is a machine with a shaft with blades rotating in a cylinder or trough, mixing multiple raw materials to form a mixture or a suitable consistency. There are many types of mixers, including forced mixers, single-horizontal shaft mixers, double-horizontal shaft mixers, and so on.

[0003] In the prior art, double-horizontal shaft mixers are mostly used to mix and blend powdery materials to achieve a uniform mixing purpose. It can be a mixture of a single powdery material and a liquid, or applicable to the mixing of multiple materials. Regardless of which type of mixing, when in use, there will be gaps between the blades and the cylinder wall or trough wall, and some materials are likely to deposit and adhere to the bottom wall of the cylinder or trough, resulting in the inability to achieve a uniform mixing purpose for the material mixing; at the same time, for the mixing of multiple materials, various materials are generally fed centrally. When the blades rotate with the shaft, each blade can only mix and blend the area where the blade is located, achieving a local uniform mixing effect of the materials, and unable to achieve the purpose of overall uniform mixing; based on the above various situations, it is necessary to improve and optimize the prior art to improve the material mixing effect. Summary of the Invention

[0004] To overcome the above defects, embodiments of the present invention provide a double-shaft spiral agitator, which solves the problem in the related art that when mixing multiple materials, the materials are fed centrally, and the blades rotate with the shaft to achieve local uniform mixing of the materials, but the overall mixing is not uniform.

[0005] According to one aspect, at least one embodiment of the present invention provides a double-shaft spiral agitator, including a mixing tank for carrying materials and two mixing shafts rotatably arranged in the mixing tank. Mixing fan blades are inclinedly arranged on the mixing shafts, and the inclination angles of the mixing fan blades on the two mixing shafts are arranged in opposite directions, and the materials in the mixing tank are driven to form a circulating flow in the horizontal plane by the mixing fan blades arranged in opposite directions.

[0006] For example, in the double-shaft spiral agitator provided by at least one embodiment of the present invention, the two mixing shafts are arranged in parallel, and along the axis of the mixing shaft, several groups of the mixing fan blades are arranged at intervals on any one of the mixing shafts. Each group of the mixing fan blades includes several mixing fan blades distributed in a circumferential manner around the axis of the mixing shaft; Define the power input end of the stirring shaft as the starting end, and the other end of the stirring shaft as the ending end. Select a section on the stirring shaft and define it as the separating section. The inclination directions of the stirring blades between the separating section and the starting end are opposite to those of the stirring blades between the separating section and the ending end, and the inclination directions of any adjacent groups of the stirring blades on the two stirring shafts are opposite to each other.

[0007] For example, in the twin-shaft screw agitator provided by at least one embodiment of the present invention, a reflux unit is further included. The reflux unit includes: A reflux shaft rotatably arranged in the stirring tank, and the axis of the reflux shaft is arranged at an angle with the axis of the stirring shaft; A plurality of groups of reflux blades are inclined and distributed at intervals along the axis of the reflux shaft. Each group of reflux blades includes a plurality of reflux blades circumferentially distributed around the axis of the reflux shaft; The reflux shaft and the stirring shaft are connected by a worm and worm gear transmission pair. With the position of the reflux blades configured to push the material at one of the stirring shafts to the other stirring shaft.

[0008] For example, in the twin-shaft screw agitator provided by at least one embodiment of the present invention, the number of the reflux units is several, and at least one reflux unit is arranged at the starting end, the ending end, and the separating section.

[0009] For example, in the twin-shaft screw agitator provided by at least one embodiment of the present invention, the following are further included: A wall cleaning strip is slidably arranged on the inner wall of the stirring tank. The sliding direction of the wall cleaning strip is parallel to the rotation direction of the stirring shaft. The wall cleaning strip is parallel to the stirring shaft, and wall cleaning sharp edges are provided on both sides of the wall cleaning strip along the extending direction of the wall cleaning strip; A transmission unit is arranged in the stirring tank for transmitting external power to the wall cleaning strip and driving the wall cleaning strip to slide along the inner wall of the stirring tank.

[0010] For example, in the twin-shaft screw agitator provided by at least one embodiment of the present invention, the transmission unit includes: A first swinging member is slidably and swingably arranged on the stirring tank and located between the two stirring shafts; A sliding seat is slidably arranged on the wall cleaning strip, and the sliding direction is parallel to the axis of the stirring shaft. The sliding seat has a first hinged part; A connecting rod has one end arranged at the lower end of the first swinging member and the other end having a second hinged part hinged to the first hinged part.

[0011] For example, in the biaxial screw agitator provided by at least one embodiment of the present invention, the connecting rod is integrally S-shaped, and the connecting rod includes rod one, rod two, rod three, rod four, and rod five that are fixedly connected in sequence. Rod one is fixedly arranged at the lower end of the swinging member one, and the hinge portion two is arranged on rod five; Rod one, rod two, and rod three form a concave interval, so that when the wall cleaning strip slides along the inner wall of the stirring pool, the concave interval surrounds the outer periphery of the stirring shaft.

[0012] For example, in the biaxial screw agitator provided by at least one embodiment of the present invention, the hinge portion one is a ball head fixedly arranged on the sliding seat, and the hinge portion two is a ball seat that is cooperatively connected with the ball head.

[0013] For example, in the biaxial screw agitator provided by at least one embodiment of the present invention, the hinge portion one is a hinge seat rotatably arranged on the sliding seat, and the hinge portion two is a hinge head that is hingedly connected with the hinge seat.

[0014] For example, in the biaxial screw agitator provided by at least one embodiment of the present invention, the transmission unit further includes: Two bumps, which are respectively arranged on the outer surfaces of the two stirring shafts; A swinging member two, which is swingably arranged on the stirring pool, and the swinging axis of the swinging member two is perpendicular to the plane where the two stirring shafts are located; The swinging member two is located between the two stirring shafts and on the side of the swinging member one, and the swinging member two has a pushing portion, so that when the stirring shaft rotates, the two bumps alternately abut against the pushing portion; A gear one and a gear two that are meshingly connected, the gear one is arranged on the swinging member one, and the gear two is arranged on the swinging member two.

[0015] The beneficial effects of the embodiments of the present invention are as follows: In the present invention, the stirring pool provides a bearing space for the material. The two stirring shafts arranged in parallel form a symmetrical power driving structure through the stirring fan blades with opposite inclinations. When the stirring shafts rotate, the inclined stirring fan blades simultaneously generate an axial thrust and a circumferential shear force on the material: The axial thrust makes the material move along the length direction of the stirring shaft, and the circumferential shear force makes the material rotate and turn over. The combined action of the two forces promotes the material to form a three-dimensional circulating flow in the stirring pool. Since the inclination angles of the stirring fan blades on the two stirring shafts are opposite, from a top view angle, the two stirring shafts respectively drive the material close to and away from the power source, forming a circular flow in the horizontal plane of the stirring pool. It breaks the local accumulation state when the material is concentrated for feeding, and enables the materials in different regions to continuously exchange positions.

[0016] The structural design with stirring fan blades continuously distributed along the stirring shaft ensures that the stirring effect on the material covers the entire length range of the stirring tank, avoiding the occurrence of stirring dead zones. This design of driving the material to circulate and flow through the oppositely inclined fan blades enables multiple materials to pass through different stirring areas multiple times during the stirring process, increasing the contact frequency and mixing paths between material particles, effectively solving the problem in the prior art that the blades only achieve local uniform mixing, improving the overall mixing uniformity of the materials, and is particularly suitable for complex mixing scenarios of multiple materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following-described drawings are only some exemplary embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the exemplary embodiments of the present invention and these drawings.

[0018] Figure 1 Schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 is Figure 1 Schematic diagram of the structure at the lap joint of the stirring shaft, reflux unit and drive unit in the embodiment of Figure 3 is Figure 2 Local enlarged view of the X position of Figure 4 is Figure 1 Schematic diagram of the structure at the drive unit in the embodiment of Figure 5 is Figure 1 Schematic diagram of the structure (with hinge seat and hinge head) at the lap joint of the wall cleaning strip and the drive unit in the embodiment of Figure 6 is Figure 5 Local enlarged view of the Y position of Figure 7 is Figure 1 Schematic diagram of the structure (with ball head and ball seat) at the lap joint of the wall cleaning strip and the drive unit in the embodiment of Figure 8 is Figure 7 Local enlarged view of the Z position of In the figure: 1, stirring tank; 11, stirring shaft; 12, stirring blades; 13, starting end; 14, ending end; 15, partition section; 2, reflux unit; 21, reflux shaft; 22, reflux blades; 3, wall cleaning strip; 31, wall cleaning sharp edge; 4, transmission unit; 41, first swinging member; 42, sliding seat; 43, first hinge portion, 431, ball head, 432, hinge seat; 44, connecting rod, 441, first rod, 442, second rod, 443, third rod, 444, fourth rod, 445, fifth rod, 446, recessed interval; 45, second hinge portion, 451, ball seat, 452, hinge joint; 46, convex block; 47, second swinging member, 471, pushing portion; 48, first gear; 49, second gear. Detailed implementation mode

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention.

[0020] To make the drawings concise, only the parts related to the disclosure are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0021] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is at a lower horizontal height than the second feature.

[0023] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] like Figures 1 to 8 As shown, it shows a double-shaft spiral agitator in one embodiment of the present invention, the double-shaft spiral agitator includes a trough-shaped stirring pool 1, the interior of the stirring pool 1 forms a cavity for accommodating materials, two stirring shafts 11 are arranged in parallel and at intervals in the stirring pool 1, and the two ends of the stirring shaft 1 are rotatably connected to the side wall of the stirring pool 1 through a bearing seat. A discharge port is provided at the lower end of the stirring pool 1 to facilitate the discharge of materials. A stirring blade 12 is tilted on the outer peripheral surface of each stirring shaft 11, and the plate surface of the stirring blade 12 forms a preset inclination angle with the axis of the stirring shaft 11. The stirring blade 12 is plate-shaped as a whole, and is set at an angle with the axis of the stirring shaft 11 (set to be vertical in this example), and the plate surface of the stirring blade 12 is set at an angle with the rotation direction of the stirring shaft 11; the two stirring shafts 11 are symmetrically distributed relative to the center line of the length direction of the stirring pool 1, and the inclination angles of the stirring blades 12 on the two stirring shafts 11 are symmetrically arranged relative to the center plane of the length direction of the stirring pool 1, and each group of stirring blades 12 on adjacent stirring shafts 11 are staggered. The stirring blades 12 are continuously distributed along the axis of the stirring shaft 11 , and their connection edges with the stirring shaft 11 are fixedly attached to the outer peripheral surface of the stirring shaft 11 , and their free edges extend toward the inside of the stirring tank 1 , and adjacent stirring blades 12 are evenly spaced in the circumferential direction.

[0026] One of the two stirring shafts 11 is connected to the external power source in a transmission manner. The stirring shaft 11 is defined as the A shaft, and the other stirring shaft 11 is defined as the B shaft. The A shaft and the B shaft are connected together by sprockets and chains that cooperate with each other in the prior art and rotate in the same direction; at the same time, the end of the stirring shaft 11 connected to the power source is the starting end 13, and the end away from the power source is the end 14; the external power source can be a power device that can provide rotational drive in the prior art, and an electrically driven motor is selected in this example; when the two stirring shafts 11 rotate in the same direction, the A shaft and the stirring blades 12 on the A shaft drive the material in the stirring area of ​​the A shaft to gradually move from the starting end 13 to the end 14, and the B shaft and the stirring blades 12 on the B shaft drive the material in the stirring area of ​​the B shaft to gradually move from the end 14 to the starting end 13; so that the materials in the entire stirring pool 1 form an overall circular movement during the stirring and mixing process.

[0027] The stirring tank 1 provides a bearing space for the materials. Two stirring shafts 11 arranged in parallel form a symmetric power drive structure through the stirring blades 12 with opposite inclinations. When the stirring shafts 11 rotate, the inclined stirring blades 12 generate an axial thrust and a circumferential shear force on the materials simultaneously: the axial thrust makes the materials move along the length direction of the stirring shafts 11, and the circumferential shear force makes the materials rotate and tumble. The combined action of these two forces promotes the materials to form a three-dimensional circulating flow in the stirring tank 1. Since the inclination angles of the stirring blades 12 on the two stirring shafts 11 are opposite, from a top view, the two stirring shafts 11 drive the materials to approach and move away from the power source respectively, forming a circular flow in the horizontal plane of the stirring tank 1. This breaks the local accumulation state when the materials are fed centrally, and enables the materials in different regions to continuously exchange positions.

[0028] The structural design of the continuous distribution of the stirring blades 12 along the stirring shafts 11 ensures that the stirring effect on the materials covers the entire length range of the stirring tank 1, avoiding stirring dead zones. This design of driving the materials to circulate through the oppositely inclined blades enables multiple materials to pass through different stirring regions multiple times during the stirring process, increasing the contact frequency and mixing path between the material particles, effectively solving the problem in the prior art that the blades only achieve local mixing uniformity, improving the overall mixing uniformity of the materials, and is particularly suitable for complex mixing scenarios of multiple materials.

[0029] In some examples, the distribution of the stirring blades 12 in the double-shaft screw stirrer is refined. For example, as Figures 1 to 2 shown, in the double-shaft screw stirrer, the two stirring shafts 11 are arranged in parallel in the stirring tank 1, and their axes are consistent with the length direction of the stirring tank 1. Along the axial direction of any one of the stirring shafts 11, a plurality of groups of stirring blades 12 are arranged at intervals on the outer peripheral surface of the stirring shaft 11, and the axial spacing between each group of stirring blades 12 is equal; each group of stirring blades 12 includes a plurality of stirring blades 12 distributed circumferentially around the axis of the stirring shaft 11, and the stirring blades 12 within the same group are evenly spaced circumferentially, and the central angle between adjacent blades is equal.

[0030] Define one end of the stirring shaft 11 connected to the power source as the starting end 13, and the other end as the ending end 14. Select a section at the middle position on the axis of the stirring shaft 11 as the partition section 15 (in this example, the partition section 15 selects the midpoint area of the length of the stirring shaft 11). For the stirring blades 12 between the partition section 15 and the starting end 13, the inclination direction of the blade surface with respect to the axis of the stirring shaft 11 is the first direction (such as inclining towards the starting end 13 side relative to the axis); for the stirring blades 12 between the partition section 15 and the ending end 14, the inclination direction of the blade surface with respect to the axis of the stirring shaft 11 is the second direction (such as inclining towards the ending end 14 side relative to the axis), and the first direction is opposite to the second direction.

[0031] For two stirring shafts 11 arranged in parallel (defined as shaft A and shaft B respectively), the inclination direction of any set of stirring blades 12 on shaft A is opposite to that of a set of stirring blades 12 at an adjacent position on shaft B. For example, if the stirring blades 12 from the starting end 13 to the partition section 15 of shaft A incline towards the starting end 13, then the stirring blades 12 at the corresponding position on shaft B incline towards the end 14; if the stirring blades 12 from the partition section 15 to the end 14 of shaft A incline towards the end 14, then the stirring blades 12 at the corresponding position on shaft B incline towards the starting end 13.

[0032] The structure with two parallel stirring shafts 11 ensures the symmetry of the stirring area, enabling the flow path of the material in the stirring tank 1 to cover the entire length range. Multiple sets of stirring blades 12 arranged at intervals along the axis of the stirring shaft 11 divide the axial direction of the stirring shaft 11 into multiple independent stirring units. Each set of blades forms a local material pushing area during rotation, and the intervals between adjacent sets prevent the material from concentrating excessively in a single direction, enhancing the layering of the stirring. Each set of stirring blades 12 includes multiple blades distributed circumferentially, so that the stirring shaft 11 generates a circumferentially uniform thrust on the material during rotation, avoiding local stirring blind spots caused by uneven blade distribution.

[0033] The design with opposite inclination directions of the stirring blades 12 on both sides of the partition section 15 causes the material on the same stirring shaft 11 to be pushed towards the partition section 15 in the area from the starting end 13 to the partition section 15 and pulled towards the partition section 15 in the area from the partition section 15 to the end 14, forming an axial convection centered on the partition section 15; this convection effect causes the material to concentrate and converge in the axial midpoint area of the stirring shaft 11, promoting the mixing of materials at different axial positions. The structure with opposite inclination directions of adjacent sets of stirring blades 12 on the two stirring shafts 11 further strengthens the cross-flow of the material: when a certain set of blades on shaft A pushes the material towards the starting end 13 / end 14, the corresponding blades on shaft B pull the material towards the end 14 / starting end 13, causing the material to generate a circulating flow in the horizontal plane of the stirring tank 1.

[0034] The synergistic effect of the above structure enables the material in the stirring tank 1 to simultaneously undergo axial convection, circumferential shear, and cross-axis cross-mixing, effectively breaking the local accumulation state of the material caused by centralized feeding in traditional stirring devices, significantly increasing the contact frequency and mixing path length between different material particles, thus solving the problem in the prior art that the blades only achieve local mixing uniformity and improving the overall mixing uniformity of the material. The layout of the blades with interval grouping also reduces the stress intensity of a single blade and extends the service life of the stirring device.

[0035] In some examples, the structure of the double-shaft spiral stirrer is refined. The double-shaft spiral stirrer further includes a reflux unit 2, which consists of a reflux shaft 21 and reflux blades 22. For example, as Figures 1 to 4As shown, the reflux shaft 21 is rotatably arranged in the stirring tank 1, and its axis forms a non-parallel angle with the axis of the stirring shaft 11. In this example, the axis of the reflux shaft 21 is perpendicular to the axis of the stirring shaft 11; both ends of the reflux shaft 21 are rotatably connected to the side wall of the stirring tank 1 through bearing seats. The reflux fan blades 22 are obliquely arranged on the outer peripheral surface of the reflux shaft 21, and multiple groups are distributed at intervals along the axis of the reflux shaft 21. Each group of reflux fan blades 22 includes multiple fan blades circumferentially distributed around the axis of the reflux shaft 21. The reflux fan blades 22 within the same group are evenly spaced in the circumferential direction, and the central angle between adjacent fan blades is equal.

[0036] The reflux shaft 21 is connected to one of the stirring shafts 11 through a worm and worm gear transmission pair: a worm is fixedly arranged on the outer peripheral surface of the stirring shaft 11 (in this example, the worm appears in the form of a sleeve and is sleeved on the stirring shaft 11), and a worm gear meshing with the worm is fixedly arranged on the reflux shaft 21. When the stirring shaft 11 rotates, the worm drives the worm gear to rotate, thereby driving the reflux shaft 21 to rotate synchronously. The inclination direction of the reflux fan blades 22 is determined according to the material pushing requirement: when the reflux shaft 21 rotates, the obliquely arranged reflux fan blades 22 generate a thrust on the material, and push the material in the stirring area of one stirring shaft 11 (such as shaft A) to the stirring area of another stirring shaft 11 (such as shaft B), and the pushing direction is consistent with the included angle direction between the axis of the reflux shaft 21 and the axis of the stirring shaft 11.

[0037] The structure in which the reflux shaft 21 and the stirring shaft 11 are arranged at an angle makes the pushing direction of the reflux fan blades 22 cross with the axial flow direction of the main stirring shaft 11, and constructs a three-dimensional material flow path in the stirring tank 1. The worm and worm gear transmission pair transmits the rotational power of the stirring shaft 11 to the reflux shaft 21, and the driving of the reflux unit 2 can be realized without an additional power source, which simplifies the equipment structure and reduces energy consumption. The multiple groups of reflux fan blades 22 distributed at intervals along the axis of the reflux shaft 21 realize the continuous pushing of the material; avoid excessive accumulation of the material at a single position; each group includes multiple circumferentially distributed reflux fan blades 22, so that the reflux shaft 21 generates a circumferentially uniform thrust on the material when rotating, ensuring that the material is stably and evenly pushed to the area of another stirring shaft 11.

[0038] The obliquely arranged return fan blade 22 converts the rotational motion of the return shaft 21 into a lateral pushing force on the material through contact with the material, compensating for the limitation that the stirring shaft 11 can only achieve axial and circumferential mixing, and enabling the material to form a cross-axis flow between the two stirring shafts 11. This cross-axis flow is superimposed on the axial circulation flow driven by the main stirring shaft 11 to form a three-dimensional mixing path of "axial - lateral - circumferential", significantly increasing the contact frequency between material particles and the coverage range of the mixing area. Especially for the scenario of centralized feeding of multiple materials, the return unit 2 actively pushes the locally accumulated material to the stirring area of another stirring shaft 11, avoiding the local mixing blind area caused by uneven material distribution in the traditional stirring device and further improving the overall mixing uniformity. The meshing structure of the worm and worm gear transmission pair also has a self-locking characteristic, preventing the return shaft 21 from rotating reversely due to material resistance and ensuring the stability of the material pushing direction.

[0039] At the same time, the position design of the return shaft 21 effectively alleviates the problem of material accumulation caused by the counterflow of materials on both sides of the partition section 15 on a single stirring shaft 11, forming two circulating flow rings of materials in the horizontal plane of the stirring tank 1. For example, for the materials in the A-axis area, they converge from the starting end 13 and the ending end 14 along the A-axis towards the partition section 15 in the middle. Then, for the B-axis area, the materials are transported from the partition section 15 of the B-axis to the starting end 13 and the ending end 14 of the B-axis respectively; with the help of the return unit 2 at the partition section 15, the flow of materials from the A-axis to the B-axis is realized, and finally, two circulating flows with an overlapping area are formed in the horizontal plane of the stirring tank 1, that is, A-axis (starting end 13 or ending end 14) → A-axis partition section 15 → return shaft 21 → B-axis partition section 15 → B-axis (starting end 13 or ending end 14) → A-axis (starting end 13 or ending end 14); two groups of circulations are formed to ensure the full mixing of materials.

[0040] In some examples, the structure of the twin-shaft screw agitator is refined. For example, as Figures 1 to 4 shown, several return units 2 are provided. In this example, three are preferably provided. One return unit 2 is provided between the A-axis partition section 15 and the B-axis partition section 15, one return unit 2 is provided between the starting end 13 of the A-axis and the starting end 13 of the B-axis, and one return unit 2 is provided between the ending end 14 of the A-axis and the ending end 14 of the B-axis; during use, the additional return units 2 at the starting end 13 and the ending end 14 contribute to the material flow between the A-axis and the B-axis, preventing the formation of a flow blind area of materials at the starting end 13 or the ending end 14 and reducing the mixing uniformity of the materials.

[0041] In some examples, the structure of the twin-shaft screw agitator is refined. For example, as Figures 1 to 8As shown in the figure, the double-shaft spiral agitator further includes a wall cleaning strip 3 and a transmission unit 4. The wall cleaning strip 3 is a strip-shaped member, and its extending direction is parallel to the axis of the stirring shaft 11. It is slidably arranged on the inner wall of the stirring tank 1 (the inner wall refers to the inner side surface of the cavity of the stirring tank 1 that accommodates materials). The inner wall of the stirring tank 1 is a circular arc with a consistent radius; the sliding direction of the wall cleaning strip 3 is parallel to the rotating direction of the stirring shaft 11 (i.e., perpendicular to the length direction of the stirring tank 1). Along the extending direction of the wall cleaning strip 3, wall cleaning sharp edges 31 are respectively arranged on its left and right sides. The cutting edge of the sharp edge contacts the inner wall of the stirring tank 1 to form a scraping structure that fits the inner wall. The transmission unit 4 is arranged in the stirring tank 1. Its power input end is connected to an external power source (such as a motor that drives the stirring shaft 11 to rotate), and its power output end is connected to the wall cleaning strip 3, and is used to transmit the external power to the wall cleaning strip 3 to drive the wall cleaning strip 3 to reciprocate along the inner wall of the stirring tank 1.

[0042] The sliding arrangement of the wall cleaning strip 3 parallel to the rotating direction of the stirring shaft 11 enables its sliding path to cover the lower half of the inner wall of the stirring tank 1, mainly the area covered under the fan blades. In this area, due to the presence of the stirring fan blades 12, effective management and treatment cannot be carried out from the outside; it can effectively remove the materials attached to the inner wall area that cannot be reached by the blades during the stirring process, especially the materials attached to the bottom area of the inner wall. The wall cleaning sharp edges 31 arranged on both sides along the extending direction of the wall cleaning strip 3 produce a scraping effect on the inner wall when the wall cleaning strip 3 reciprocates: In the cavity of the stirring tank 1, when the wall cleaning strip 3 slides from below the A axis to below the B axis, one side of the sharp edge scrapes the materials attached to the inner wall. When the wall cleaning strip 3 slides from below the B axis to below the A axis, the other side of the sharp edge scrapes the materials attached to the inner wall, ensuring that when the wall cleaning strip 3 slides, there is always one side of the sharp edge scraping the materials attached to the inner wall, avoiding local accumulation of materials caused by sedimentation or adhesion. The transmission unit 4 transmits the external power to the wall cleaning strip 3, making the sliding of the wall cleaning strip 3 form a linkage with the rotation of the stirring shaft 11. The wall cleaning function can be realized without an additional power source, which simplifies the equipment structure. The sliding movement of the wall cleaning strip 3 and the rotational stirring of the stirring shaft 11 cooperate with each other. On the one hand, it prevents the materials from solidifying on the inner wall through the scraping of the sharp edges. On the other hand, the scraped materials are remixed into the stirring area to participate in the overall mixing process, solving the problem of uneven mixing caused by the adhesion of materials to the inner wall in the prior art. The sharp edge structure of the wall cleaning strip 3 in contact with the inner wall reduces the adhesion between the materials and the inner wall through physical scraping, improves the self-cleaning ability of the stirring tank 1, reduces the frequency of manual cleaning and maintenance, and prolongs the continuous operation time of the equipment.

[0043] In some examples, the structure of the transmission unit 4 is refined. For example, as Figures 1 to 2 and Figures 4 to 8As shown, the transmission unit 4 of the double-shaft spiral agitator includes a swinging member 41, a slide 42 and a connecting rod 44. The swinging member 41 is a rod-shaped member, and its upper end is slidably and rotatably arranged on the top frame of the stirring tank 1 through a guide hole. The top frame is provided with a pressure-maintaining device with adjustable linear driving force in the prior art, such as a linear electric cylinder controlled by a solenoid valve, or a hydraulic cylinder controlled by a solenoid valve, etc., to provide a downward force for the swinging member. The force provided by the pressure-maintaining device is transmitted through the swinging member 41, the connecting rod 44 and the slide 42, and finally acts on the wall cleaning strip 3, so that the wall cleaning strip 3 and the bottom wall of the stirring tank 1 are kept in a state of conflict. The sliding direction is perpendicular to the axis of the stirring shaft 11. In this example, the stirring tank 1 is placed horizontally, and the swinging member 41 is arranged to slide up and down; the whole forms a composite motion structure of sliding and swinging, and the swinging member 41 is located in the gap area between the two stirring shafts 11.

[0044] The slide 42 is a block-shaped component, and its bottom is slidably set in the slide groove on the wall cleaning strip 3. The extension direction of the slide groove is parallel to the axis of the stirring shaft 11. The slide 42 is slidably set on the top of the wall cleaning strip 3 through the slide groove, and can slide back and forth along the length direction of the wall cleaning strip 3; a hinge part 43 is set on the top of the slide 42, and the hinge part 43 is a columnar structure protruding from the upper surface of the slide 42.

[0045] The connecting rod 44 is a rod-shaped member, the upper end of which is fixedly connected to the lower end of the swing member 1 41, and the lower end is provided with a hinge part 2 45, which is a hinge structure that cooperates with the hinge part 1 43. When the swing member 1 41 slides up and down along the guide hole to rotate, the connecting rod 44 is sleeved on the columnar structure of the hinge part 1 43 through the hinge part 2 45 to form a rotatable hinge connection. The connecting rod 44 changes its angle with the composite motion of the swing member 1 41, and through the hinged cooperation between the hinge part 1 43 and the hinge part 2 45, the slide seat 42 is pushed to slide along the length direction of the wall cleaning strip 3, thereby driving the wall cleaning strip 3 to reciprocate along the inner wall of the mixing tank 1.

[0046] The composite motion structure of the sliding and swinging of the swing member 41 converts the external input power into a multi-dimensional motion in a plane. When it is transmitted to the slide 42 through the connecting rod 44, it can compensate for the position deviation caused by the shape change of the inner wall of the mixing tank 1 or the material resistance during the sliding process of the wall cleaning strip 3, and ensure the stability of the transmission process. The structure in which the slide 42 is slidably connected to the wall cleaning strip 3 through the slide groove limits the movement direction of the slide 42 to be consistent with the sliding direction of the wall cleaning strip 3, avoiding the displacement of the slide 42 during the movement process, and ensuring that the wall cleaning strip 3 slides along the predetermined path. The hinged structure (the hinge part 1 43 and the hinge part 2 45) at both ends of the connecting rod 44 allows the connecting rod 44 and the slide 42 to generate relative rotation, adapting to the change in the angle of the connecting rod 44 when the swing member 41 swings, so that the composite motion of the swing member 41 can be smoothly converted into the linear motion of the slide 42, reducing the mechanical wear during the transmission process.

[0047] The arrangement of the first swinging member 41 between the two stirring shafts 11 makes use of the idle area of the stirring tank 1 and avoids interference with the stirring blades 12 of the stirring shafts 11. The structure of the sliding seat 42 arranged on the top of the wall cleaning strip 3 keeps the power transmission path of the transmission unit 4 consistent with the sliding direction of the wall cleaning strip 3, improving the transmission efficiency. With the above structure, the transmission unit 4 can stably drive the wall cleaning strip 3 to slide along the inner wall of the stirring tank 1, effectively removing the materials adhered to the inner wall, solving the problem of uneven mixing caused by the materials sticking to the wall, and at the same time reducing the need for manual cleaning and maintenance, and improving the continuous operation reliability of the stirring device.

[0048] In some examples, the structure of the connecting rod 44 is refined. For example, as Figures 1 to 2 and Figures 4 to 8 shown, in the transmission unit 4 of the double-shaft spiral stirrer, the connecting rod 44 is integrally S-shaped and is composed of a first rod 441, a second rod 442, a third rod 443, a fourth rod 444 and a fifth rod 445 that are fixedly connected in sequence. The upper end of the first rod 441 is fixedly connected to the lower end of the first swinging member 41. The lower end of the fifth rod 445 is provided with a second hinge portion 45 (such as a structure of an annular groove or a ball seat 451) for hinge connection with the first hinge portion 43 (such as a cylindrical ball head 431 or a hinge seat 432) on the sliding seat 42. The first rod 441, the second rod 442 and the third rod 443 are connected in sequence to form a recessed interval 446, and the concave radian of the recessed interval 446 is adapted to the outer peripheral radian of the stirring shaft 11. The third rod 443, the fourth rod 444 and the fifth rod 445 are connected in sequence to form a transition interval for ensuring the rationality of the overall structural space distribution of the connecting rod 44. When the wall cleaning strip 3 slides along the inner wall of the stirring tank 1, the inner concave surface of the recessed interval 446 is buckled to the periphery of the stirring shaft 11, so that the first rod 441, the second rod 442 and the third rod 443 of the connecting rod 44 partially fit the outer peripheral surface of the stirring shaft 11 (with a gap), and the fourth rod 444 and the fifth rod 445 partially drive the sliding seat 42 to slide along the wall cleaning strip 3 with the swing of the first swinging member 41. This enables the wall cleaning strip 3 to slide upward along the inner wall of the stirring tank 1 as much as possible, increasing the cleaning range of the wall cleaning strip 3 and improving the overall mixing effect of the stirrer.

[0049] The S-shaped structure of the connecting rod 44 forms a concave section 446 adapted to the outer peripheral surface of the stirring shaft 11 in the areas of rod one 441 to rod five 445 through segmented connection. In the initial state, the first swinging member 41, the connecting rod 44, the sliding seat 42, and the wall cleaning strip 3 are located in the gap between the two stirring shafts 11. The length direction of the connecting rod 44 is parallel to the extending direction of the stirring shaft 11, that is, the S-shaped connecting rod 44 is in a horizontally laid-down state; the concave section 446 is strip-shaped and located between the two stirring shafts 11 (the plane where the connecting rod 44 is located is perpendicular to the ground and parallel to the stirring shaft 11); as the first swinging member 41 swings, the wall cleaning strip 3 gradually slides downward along the inner wall of the stirring tank 1 towards one of the stirring shafts 11. At this time, the connecting rod 44 follows the swinging member and swings around the swinging axis of the swinging member. As the wall cleaning strip 3 slides, with the help of the first hinge portion 43 and the second hinge portion 45 in hinge cooperation, the rod five 445 drives the sliding seat 42 to slide along the length direction of the wall cleaning strip 3; as the wall cleaning strip 3 slides, the horizontal height of the wall cleaning strip 3 gradually increases, and the swinging member guide hole slides upward to cooperate with the sliding of the wall cleaning strip 3; at the same time, when the swinging member swings, the concave section 446 in the areas of rod one 441, rod two 442, and rod three 443 gradually moves from between the two stirring shafts 11 to below one of the stirring shafts 11, and the plane where the concave section 446 is located gradually changes from parallel to an angular state with the axis of the stirring shaft 11. The design of the concave section 446 avoids the collision interference between the connecting rod 44 and the stirring shaft 11, ensuring the compatibility of the spatial layout of the transmission unit 4 and the stirring shaft 11. The fixed connection structure of rod one 441 to rod five 445 ensures the overall rigidity of the connecting rod 44, enabling the compound motion of the first swinging member 41 to be effectively transmitted to the sliding seat 42 through the connecting rod 44, improving the transmission efficiency. The segmented design of the S-shaped connecting rod 44 also disperses the stress concentration during the movement process, reducing the risk of fatigue damage to the connecting rod 44 caused by long-term reciprocating motion and extending the service life of the transmission unit 4. Through the above structure, the connecting rod 44 not only realizes the power transmission between the first swinging member 41 and the sliding seat 42, but also forms a spatial adaptation with the periphery of the stirring shaft 11 through the buckling effect of the concave section 446, ensuring the smoothness and reliability of the sliding process of the wall cleaning strip 3.

[0050] In some examples, the structures of the first hinge portion 43 and the second hinge portion 45 are refined. For example, as Figures 1 to 2 and Figures 4 to 8As shown, in the drive unit 4 of the twin-shaft spiral agitator, the first hinge part 43 is a ball head 431 fixedly arranged on the upper surface of the slide block 42. The ball head 431 has a hemispherical structure, and its center of the ball is located on the center line of the slide block 42. The bottom of the ball head 431 is fixedly connected to the upper surface of the slide block 42. The second hinge part 45 is a ball socket 451 arranged at the lower end of the connecting rod 44. The ball socket 451 is a shell structure with a hemispherical groove, and the inner diameter of the groove is adapted to the outer diameter of the ball head 431. The opening of the groove of the ball socket 451 faces the direction of the ball head 431. The ball head 431 is embedded in the groove of the ball socket 451 to form a rotatable spherical hinge connection, allowing the ball head 431 to swing and rotate in any direction within the groove of the ball socket 451. When the first swing part 41 drives the connecting rod 44 to move, the connecting rod 44 converts the compound motion of the first swing part 41 into a linear sliding of the slide block 42 along the wall cleaning strip 3 through the spherical surface fit between the ball socket 451 and the ball head 431 on the slide block 42. The relative rotation between the ball head 431 and the ball socket 451 can compensate for the angular deviation generated when the connecting rod 44 swings. At the same time, the sliding of the slide block 42 can push the wall cleaning strip 3 to slide along the inner wall of the stirring tank 1.

[0051] The spherical hinge structure between the ball head 431 and the ball socket 451 provides a multi-degree-of-freedom rotational connection between the connecting rod 44 and the slide block 42, allowing relative movement between the two in three-dimensional space, effectively adapting to the angular changes of the connecting rod 44 during the sliding and swinging of the first swing part 41, and avoiding motion interference or jamming caused by rigid connection. The layout with the ball head 431 fixed to the slide block 42 and the ball socket 451 arranged on the connecting rod 44 enables the radial force and axial force generated during the transmission process to be evenly distributed through the spherical surface, reducing local stress concentration and reducing mechanical wear at the hinge part. The non-clearance rotational characteristic of the spherical surface fit ensures the smoothness of power transmission, enabling the slide block 42 to accurately follow the movement track of the connecting rod 44 and slide along the wall cleaning strip 3, thereby ensuring the reciprocating movement accuracy of the wall cleaning strip 3 along the inner wall of the stirring tank 1. This hinge structure can realize the coupling of multi-directional movements without a complex guiding mechanism, simplifies the mechanical structure of the drive unit 4, and at the same time improves the reliability of the wall cleaning strip 3 drive system, especially suitable for the requirement of attitude adjustment of the connecting rod 44 due to changes in material resistance during the stirring process, ensuring the continuous effectiveness of the wall cleaning function under complex working conditions.

[0052] In some examples, the structures of the first hinge part 43 and the second hinge part 45 are refined. For example, as Figures 1 to 2 and Figures 4 to 8As shown, in the drive unit 4 of the dual-axis screw agitator, the first hinge part 43 is a hinge seat 432 rotatably arranged on the slide block 42. The hinge seat 432 includes two parallel ear plates rotatably connected to the upper surface of the slide block 42. The plate surfaces of the ear plates are perpendicular to the sliding direction of the slide block 42. A horizontally extending pin shaft is arranged between the two ear plates, and both ends of the pin shaft are fixedly connected to the ear plates respectively. The second hinge part 45 is a hinge head 452 arranged at the lower end of the connecting rod 44. The hinge head 452 is a block structure with a through hole in the middle. The axis of the through hole coincides with the axis of the pin shaft. The hinge head 452 is sleeved on the pin shaft through the through hole to form a hinge connection that can rotate around the pin shaft. When the first swinging part 41 drives the connecting rod 44 to move, the hinge head 452 can rotate around the pin shaft in the vertical plane, and the hinge seat 432 can rotate on its own on the slide block 42. The rotating hinge seat 432 and the hinged hinge head 452 cooperate with each other to adapt to the angular change between the connecting rod 44 and the slide block 42, so that the swinging motion of the connecting rod 44 is converted into the linear sliding of the slide block 42 along the wall cleaning strip 3. At the same time, it avoids jamming between the connecting rod 44 and the hinge seat 432.

[0053] The hinge connection structure between the hinge seat 432 and the hinge head 452 provides a rotational freedom degree between the connecting rod 44 and the slide block 42, allowing the two to rotate relative to each other in the vertical plane, effectively compensating for the angular deviation between the connecting rod 44 and the slide block 42 when the first swinging part 41 swings, and avoiding the motion interference or jamming phenomenon caused by rigid connection. The design of the pin shaft passing through the ear plate and the through hole of the hinge head 452 keeps the rotation axis of the hinge part stable, ensuring that the swinging motion of the connecting rod 44 can be accurately transmitted to the slide block 42 and maintaining the linear sliding track of the wall cleaning strip 3 along the inner wall of the stirring tank 1. The layout of the hinge seat 432 rotatably arranged on the slide block 42 and the hinge head 452 connected to the connecting rod 44 enables the shear force generated during the transmission process to be evenly distributed through the pin shaft, reducing the local stress concentration at the hinge part, reducing mechanical wear, and enhancing the service life of the drive unit 4. This rotating hinge structure does not require a complex guiding mechanism and can realize the conversion between the swinging motion and the linear motion only through the cooperation of the pin shaft and the through hole, simplifying the mechanical structure of the drive unit 4, while ensuring the stability and reliability of the wall cleaning strip 3 drive system. It is especially suitable for the requirement of adjusting the attitude of the connecting rod 44 due to the change of material resistance during the stirring process, ensuring the continuous and effective execution of the wall cleaning function.

[0054] In some examples, the structure of the drive unit 4 is refined. For example, as Figures 1 to 2 and Figures 4 to 8As shown, the transmission unit 4 of the double-shaft spiral agitator also includes two protrusions 46, a swinging member 47, a gear 48 and a gear 49. The two protrusions 46 are fixedly arranged on the outer surfaces of the two stirring shafts 11 respectively. The swinging member 47 is a rod-shaped component, and its upper end is rotatably arranged on the top frame of the stirring tank 1 to form a swing fulcrum. The swinging member 47 is located as a whole in the gap area between the two stirring shafts 11 and is located on the side of the swinging member 41 (the front side or the rear side when viewed along the length extension direction of the stirring shaft 11); the lower end of the swinging member 47 is provided with a pushing portion 471, and the pushing portion 471 is an arc-shaped surface protruding toward the stirring shaft 11. Gear 1 48 is fixedly arranged in the middle of the swinging member 41, and gear 2 49 is fixedly arranged in the middle of the swinging member 47 (at the same height as gear 1 48), and the gear teeth of gear 1 48 and gear 2 49 are meshed with each other to form a transmission connection.

[0055] When the stirring shaft 11 rotates, the protrusion 46 rotates synchronously with the stirring shaft 11; for example, when the protrusion 46 on the A-axis rotates to contact the pushing portion 471 of the swinging member 47, the protrusion 46 pushes the pushing portion 471 to move away from the stirring shaft 11 (close to the B-axis), driving the swinging member 47 to swing to one side; the swinging member 47 swings through the meshing action of the gear 1 48 and the gear 2 49, driving the gear 1 48 to rotate in the opposite direction, thereby driving the swinging member 41 to swing around its swing fulcrum; the swinging of the swinging member 41 is driven by the connecting rod 44 is transmitted to the slide 42, driving the slide 42 to slide along the wall cleaning strip 3; when the protrusion 46 continues to rotate and disengages from the pushing portion 471, the protrusion 46 on the rotating B-axis approaches and collides with the other side of the pushing portion 471, thereby pushing the pushing portion 471 to move in the direction away from the B-axis (close to the A-axis), and is transmitted to the swing member 1 41 with the help of the meshing action of gear 1 48 and gear 2 49, thereby realizing the reverse rotation of the swing member 1 41; thereby driving the wall cleaning strip 3 to reciprocate along the inner wall of the stirring tank 1, forming a continuous sliding of the wall cleaning strip 3.

[0056] The structure in which two bumps 46 rotate with two stirring shafts 11 and intermittently come into contact with the pushing part 471 of the second swinging part 47 (at most only one bump 46 abuts against the pushing part 471), converts the rotational motion of the stirring shaft 11 into the reciprocating swing of the second swinging part 47, directly uses the existing power source of the stirring shaft 11 to drive the wall cleaning strip 3, without an additional power device, simplifies the equipment structure and reduces energy consumption. The meshing connection of the first gear 48 and the second gear 49 realizes the linkage of the first swinging part 41 and the second swinging part 47, makes the swinging directions of the two opposite, forms a symmetrical transmission relationship, and ensures that the reciprocating sliding of the wall cleaning strip 3 is smoother and more uniform. At the same time, multiple bumps 46 can be arranged on a single stirring shaft 11, evenly distributed along the circumferential direction of the stirring shaft 11, and the sliding frequency of the wall cleaning strip 3 is controlled by adjusting the number of bumps 46 to adapt to the wall cleaning requirements of different materials (for example, high-viscosity materials require a higher frequency of wall cleaning). The layout of the second swinging part 47 on the side of the first swinging part 41 makes full use of the idle space in the stirring tank 1, avoids interference with components such as the stirring shaft 11 and the connecting rod 44, and improves the structural compactness. The arc surface design of the pushing part 471 is adapted to the outer peripheral surface of the stirring shaft 11, reduces the impact stress when the bump 46 contacts the pushing part 471, reduces the wear of the components, and extends the service life of the transmission unit 4. Through the above structure, the transmission unit 4 realizes the efficient conversion of the rotational power of the stirring shaft 11 into the sliding power of the wall cleaning strip 3, and effectively improves the reliability and adaptability of the wall cleaning function.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. Twin-shaft spiral agitator, characterized in that The invention comprises a stirring pool (1) for carrying materials and two stirring shafts (11) rotatably arranged in the stirring pool (1), stirring blades (12) being arranged obliquely on the stirring shafts (11), the stirring blades (12) on the two stirring shafts (11) being arranged at opposite angles, and the materials in the stirring pool (1) are driven to form a circulating flow in a horizontal plane by means of the stirring blades (12) arranged oppositely.

2. The twin-shaft spiral agitator according to claim 1, wherein, The two stirring shafts (11) are arranged in parallel, and a plurality of groups of stirring blades (12) are arranged at intervals along the axis of the stirring shaft (11) and on any one of the stirring shafts (11), and each group of the stirring blades (12) comprises a plurality of stirring blades (12) distributed in a circle around the axis of the stirring shaft (11); The power input end of the stirring shaft (11) is defined as the starting end (13), the other end of the stirring shaft (11) is defined as the ending end (14), a section on the stirring shaft (11) is defined as the partition section (15), the stirring blades (12) between the partition section (15) and the starting end (13) are inclined in opposite directions to the stirring blades (12) between the partition section (15) and the ending end (14), and the inclination directions of any adjacent groups of stirring blades (12) on the two stirring shafts (11) are opposite.

3. The twin-shaft spiral agitator according to claim 2, wherein, It also includes a reflux unit (2), wherein the reflux unit (2) includes: A reflux shaft (21) is rotatably disposed in the stirring tank (1), and the axis of the reflux shaft (21) is disposed at an angle to the axis of the stirring shaft (11); A plurality of return blades (22) are arranged obliquely and spaced apart along the axis of the return axis (21); each group of the return blades (22) comprises a plurality of return blades (22) distributed in a circular pattern around the axis of the return axis (21); The reflux shaft (21) and the stirring shaft (11) are connected in transmission connection via a worm gear transmission pair (23), and the position of the reflux blade (22) is configured to push the material at one of the stirring shafts (11) to the other stirring shaft (11).

4. The biaxial screw agitator according to any one of claims 3, characterized in that There are a plurality of reflux units (2), and at least one reflux unit (2) is provided at the starting end (13), the end end (14), and the partition section (15).

5. The biaxial screw agitator according to any one of claims 1 to 4, characterized in that, Also includes: A wall cleaning strip (3) is slidably disposed on the inner wall of the stirring tank (1); the sliding direction of the wall cleaning strip (3) is parallel to the rotation direction of the stirring shaft (11); the wall cleaning strip (3) is parallel to the stirring shaft (11); and wall cleaning sharp edges (31) are provided along the extension direction of the wall cleaning strip (3) and on both sides of the wall cleaning strip (3); The transmission unit (4) is arranged in the stirring tank (1) and is used to transmit external power to the wall cleaning strip (3) and drive the wall cleaning strip (3) to slide along the inner wall of the stirring tank (1).

6. The biaxial screw agitator according to claim 5, characterized in that, The transmission unit (4) comprises: A swinging member (41) is slidably and swingably disposed on the stirring tank (1) and is located between the two stirring shafts (11); The sliding seat (42) is slidably arranged on the wall cleaning strip (3), and the sliding direction is parallel to the axis of the stirring shaft (11). The sliding seat (42) is provided with a first hinge part (43). The connecting rod (44), one end is arranged at the lower end of the first swinging part (41), and the other end is provided with a second hinge part (45) hinged to the first hinge part (43).

7. The twin-shaft screw agitator according to claim 6, wherein The connecting rod (44) is integrally S-shaped. The connecting rod (44) includes a first rod (441), a second rod (442), a third rod (443), a fourth rod (444) and a fifth rod (445) which are fixedly connected in sequence. The first rod (441) is fixedly arranged at the lower end of the first swinging part (41), and the second hinge part (45) is arranged on the fifth rod (445). The first rod (441), the second rod (442) and the third rod (443) form a concave interval (446), so that when the wall cleaning strip (3) slides along the inner wall of the stirring tank (1), the concave interval (446) surrounds the outer periphery of the stirring shaft (11).

8. The biaxial screw agitator according to claim 6 or 7, characterized in that, The first hinge part (43) is a ball head (431) fixedly arranged on the sliding seat (42), and the second hinge part (45) is a ball seat (451) cooperatively connected with the ball head (431).

9. The biaxial screw agitator according to claim 6 or 7, characterized in that, The first hinge part (43) is a hinge seat (432) rotatably arranged on the sliding seat (42), and the second hinge part (45) is a hinge head (452) hingedly connected with the hinge seat (432).

10. The twin-shaft spiral agitator according to claim 6, characterized in that, The transmission unit (4) further includes: Two bumps (46) are respectively arranged on the outer surfaces of the two stirring shafts (11). The second swinging part (47) is swingably arranged on the stirring tank (1), and the swinging axis of the second swinging part (47) is perpendicular to the plane where the two stirring shafts (11) are located. The second swinging part (47) is located between the two stirring shafts (11) and on the side of the first swinging part (41). The second swinging part (47) is provided with a pushing part (471), so that when the stirring shaft (11) rotates, the two bumps (46) alternately abut against the pushing part (471). The first gear (48) and the second gear (49) which are meshed. The first gear (48) is arranged on the first swinging part (41), and the second gear (49) is arranged on the second swinging part (47).

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