Double-shaft bidirectional spiral stirring assembly and uniform stirring equipment applying same

Abstract

The invention relates to the technical field of stirring equipment, and particularly discloses a double-shaft two-way spiral stirring assembly and uniform stirring equipment applying the same, the double-shaft two-way spiral stirring assembly comprises a stirring shaft and stirring blades, and the outer wall of the stirring shaft is provided with a first spiral section and a second spiral section; the first spiral section and the second spiral section are distributed in the axial direction of the stirring shafts, the spiral directions of the first spiral section and the second spiral section are opposite, the two stirring shafts are arranged in parallel, the rotating directions of the two stirring shafts are opposite, the stirring blades are used for stirring raw materials when the stirring shafts rotate, and the stirring blades comprise first blades and second blades. The first blade is wound on the surface of the stirring shaft along the first spiral section, the second blade is wound on the surface of the stirring shaft along the second spiral section, the first blade and the second blade are intermittently arranged in the axial direction, and the intermittent interval of the adjacent blades is 30%-50% of the screw pitch. The device has the effect of improving the problem of insufficient raw material mixing caused by a single flow path of the spiral stirring assembly.

Description

Technical Field

[0001] The present application relates to the technical field of stirring equipment, and in particular to a dual-shaft, bidirectional spiral stirring assembly and a material mixing device using the assembly. Background Art

[0002] As the core equipment for mixing and conveying raw materials in industrial production, the structural design of the spiral stirring assembly directly affects the raw material processing efficiency and mixing quality.

[0003] Traditional spiral stirring components mostly adopt a single-axis, single-direction continuous spiral blade structure. During the stirring process, the raw materials only flow along a fixed axial direction, and the flow path is single and orderly, which makes it difficult for the raw materials to form complex convection and shear, and is prone to problems such as insufficient local mixing and poor uniformity. Summary of the Invention

[0004] In order to improve the problem of insufficient mixing of raw materials caused by the single flow path of the spiral stirring component, the present application provides a double-axis bidirectional spiral stirring component and a material mixing device using the component.

[0005] In the first aspect, the present application provides a dual-shaft bidirectional spiral stirring assembly adopting the following technical solution: A dual-shaft, bidirectional spiral stirring assembly, comprising: A stirring shaft, the outer wall of which is provided with a first screw segment and a second screw segment, wherein the first screw segment and the second screw segment are both distributed along the axial direction of the stirring shaft, and the spiral directions of the first screw segment and the second screw segment are opposite, and the stirring shaft is provided with two, the two stirring shafts are arranged in parallel, and the two stirring shafts rotate in opposite directions; A stirring blade is used to stir the raw materials when the stirring shaft rotates. The stirring blade includes a first blade and a second blade. The first blade is wound around the surface of the stirring shaft along the first screw segment, and the second blade is wound around the surface of the stirring shaft along the second screw segment. The first blade and the second blade are intermittently arranged in the axial direction, and the intermittent interval between adjacent blades is 30% to 50% of the pitch.

[0006] By adopting the above technical scheme, the first blade and the second blade are respectively arranged in the first screw segment and the second screw segment, so that the raw material can form a two-way flow path when the stirring shaft rotates, so that the raw material converges from the two ends of the stirring shaft to the middle position of the stirring shaft, or disperses the raw material from the middle position of the stirring shaft to the two ends of the stirring shaft, thereby generating shear force and radial disturbance. Compared with the orderly flow of the traditional spiral stirring assembly, the composite flow path formed by the reverse screw segment and the double shaft in the present application can make the raw material form a complex motion state, improve the single flow path of the spiral stirring assembly, and cause the problem of insufficient mixing of the raw materials; the intermittent setting of the stirring blades can periodically break the flowing raw materials, avoiding the regular flow of the raw materials as a whole, and the interval treatment of the stirring blades can form a non-continuous pushing path, which promotes the decomposition and collision of the raw materials, so that the raw materials are further mixed, and finally further improves the single flow path of the spiral stirring assembly, which causes insufficient mixing of the raw materials; the dynamic stirring mode formed by the intermittent interval of the blades and the reverse screw segment can prevent the slurry-like raw materials from sticking and accumulating on the surface of the shaft, and cooperates with the double-axis shearing effect to play an anti-sticking role.

[0007] Preferably, the pitch of the first screw segment is 45 mm to 155 mm, and the pitch of the second screw segment is 45 mm to 155 mm.

[0008] By adopting the above technical solution, the gradient setting of the first screw segment and the second screw segment can make the stirring blade have a gradient, so that the raw material experiences dynamic changes in speed and pressure during the movement process. When the raw material moves from the two ends of the stirring shaft (larger pitch) to the middle position, the pushing frequency of the stirring blade increases as the pitch decreases, the number of times the raw material is squeezed gradually increases, and the flow speed gradually decreases. At the middle position (smaller pitch), the raw material forms a local high-pressure area due to the increased pushing resistance. Raw materials in different directions collide and shear here. Combined with the radial force generated by the reverse rotation of the two shafts, the problem of insufficient mixing of raw materials due to the single flow path of the spiral stirring component is improved.

[0009] In a second aspect, the present application provides a material mixing device, which adopts the following technical solution: A material mixing device, comprising: A mixing drum encloses and forms a processing chamber; The above-mentioned dual-shaft bidirectional spiral stirring assembly is inserted into the stirring drum and is used to stir the raw materials in the processing chamber. The distance between the two stirring shafts is 40% to 50% of the inner diameter of the stirring drum. The kneading component is distributed spirally along the stirring shaft and includes a connecting rod and a kneading piece. The connecting rod is fixedly connected to the stirring shaft, and the kneading piece is fixedly connected to the end of the connecting rod away from the stirring shaft, or the kneading piece is rotatably connected to the end of the connecting rod away from the stirring shaft. The kneading component is used to knead the raw materials when the dual-axis bidirectional spiral stirring assembly is working.

[0010] By adopting the above technical solution, the mixing drum can form a processing chamber for the dual-axis bidirectional spiral stirring assembly to stir the raw materials, thereby providing a closed stirring environment for the raw materials. The spacing between the two stirring shafts is set to 40%~50% of the inner diameter of the mixing drum, which can avoid the insufficient stirring intensity of the raw materials in the middle position due to excessive spacing, and avoid the risk of shaft collision due to excessive spacing. The kneading parts can knead rigidly (suitable for hard agglomerated raw materials) or rolling kneading (suitable for viscous slurry), stirring and kneading the raw materials between the drum wall and the shafts, and re-drawing the raw materials into the stirring flow field.

[0011] Preferably, the kneading piece is an arc-shaped plate, the kneading piece is fixedly connected to the connecting rod, the inclination angle formed by the extension path of the kneading piece and the axis of the stirring shaft is 15°~30°, and the kneading piece is a wear-resistant ceramic plate.

[0012] By adopting the above technical solution, the inclination angle enables the arc plate to produce oblique scraping and positive extrusion on the raw material when rotating with the shaft. The inclination direction forms an acute angle with the pushing direction of the screw segment, which can guide the raw material to flip along the arc surface and then be pushed by the subsequent blades. The inclination gradient of 15°~30° can make the kneading intensity change with the change of rotation speed. For example, the higher the rotation speed, the greater the axial component force generated by the inclined surface, and the kneading intensity is greater, thereby adapting to the kneading requirements of raw materials with different viscosities. The selection of wear-resistant ceramic plate material utilizes its high hardness and low friction coefficient, which not only reduces the risk of adhesion between the raw material and the surface of the kneading part, but also improves the wear resistance to high-hardness granular raw materials.

[0013] Preferably, the kneading member is a metal roller, and the kneading member is rotatably connected to the connecting rod. The kneading member can rotate relative to the connecting rod to knead the raw materials.

[0014] By adopting the above technical solution, when the stirring shaft drives the kneading part to rotate, the raw materials between the outer wall of the metal roller and the inner wall of the stirring drum will generate radial resistance to the roller. This resistance drives the kneading part to rotate autonomously around the connecting rod. Especially when encountering hard lumps of raw materials, the roller avoids the rigid impact of the hard lumps of raw materials by slipping, and at the same time crushes the hard lumps of raw materials while rolling, so that the hard lumps of raw materials are broken.

[0015] Preferably, a scraper plate is further included, which is fixedly connected to the stirring shaft, the length direction of the scraper plate is perpendicular to the axial direction of the stirring shaft, the scraper plate abuts against the inner wall of the stirring drum, and the scraper plate is used to scrape off the raw materials attached to the inner wall of the stirring drum. There are two scraper plates, and the two scraper plates are respectively arranged at both ends of the stirring shaft.

[0016] By adopting the above technical solution, when the stirring shaft rotates, it can drive the scraper to move. Since the scraper abuts against the inner wall of the stirring drum, the scraper can scrape off the raw materials attached to the inner wall of the stirring drum and stir the raw materials at the same time.

[0017] Preferably, the cross-sectional widths of the two sides of the scraper plate are smaller than the width of the middle portion, and the scraper plate is a polytetrachloroethylene plate.

[0018] By adopting the above technical solution, the cross-sectional width of the end portion of the scraper in the direction of rotation is smaller than the width of the middle portion, so that when the scraper is scraping off the raw materials, the contact area between the scraping end of the scraper and the raw materials is smaller, reducing the obstruction of the scraper by the raw materials, thereby avoiding a large burden on the stirring shaft; the polytetrachloroethylene plate has self-lubricating properties, making it difficult for the raw materials to adhere to the surface of the scraper.

[0019] Preferably, it also includes a valve body, the channel length of the valve body is 5cm~6cm, the inner wall of the channel of the valve body is provided with a polytetrachloroethylene coating, the valve body is connected to the processing chamber, and the valve body is used to allow the raw material to flow into the processing chamber to reduce the adhesion of the raw material on the flow path.

[0020] By adopting the above technical solution, when the raw materials flow through the valve body into the processing chamber, the adhesion or accumulation of the raw materials can be reduced, the utilization rate of the raw materials can be improved, and subsequent cleaning and continued normal operation of the equipment can be facilitated.

[0021] Preferably, the mixing drum is formed by connecting two parallel cylinders, the adjacent sides of the two cylinders overlap, the walls of the overlapping parts of the two cylinders are removed, the cavities of the two cylinders are connected, and the two mixing shafts of the dual-axis bidirectional spiral mixing assembly are respectively arranged in the two cylinders.

[0022] By adopting the above technical solution, the stirring blade group in each cylinder pushes the raw materials to the overlapping area, forming a convection state of left cylinder pushing right and right cylinder pushing left, ensuring the uniformity of raw material stirring.

[0023] Preferably, the speed ratio of the two stirring shafts of the dual-shaft bidirectional spiral stirring assembly is 1:1, so as to achieve synchronous stirring of the two stirring shafts and improve the uniformity of raw material mixing.

[0024] By adopting the above technical solution, the speed ratio of the two stirring shafts is 1:1, which can achieve dynamic balance in the stirring of the raw materials, thereby ensuring uniform stirring of the raw materials and improving the stability of the process and the consistency of the product.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The first blade and the second blade are respectively arranged on the first screw segment and the second screw segment, so that when the stirring shaft rotates, the raw materials can form a two-way flow path, so that the raw materials converge from the two ends of the stirring shaft to the middle position of the stirring shaft, or disperse from the middle position of the stirring shaft to the two ends of the stirring shaft, thereby generating shear force and radial disturbance. Compared with the orderly flow of the traditional spiral stirring component, the composite flow path formed by the reverse screw segment and the double shaft of the present application can make the raw materials form a complex motion state, thereby improving the single flow path of the spiral stirring component, resulting in insufficient mixing of the raw materials; the intermittent setting of the stirring blades can periodically break the flowing raw materials, avoiding the regular flow of the raw materials as a whole, and the interval treatment of the stirring blades can form a discontinuous pushing path, which promotes the decomposition and collision of the raw materials, so that the raw materials are further mixed, and finally further improves the single flow path of the spiral stirring component, resulting in insufficient mixing of the raw materials; the dynamic stirring mode formed by the intermittent spacing of the blades and the reverse screw segment can prevent the slurry-like raw materials from sticking and accumulating on the surface of the shaft, and can play an anti-sticking role in conjunction with the double-axis shearing effect; 2. The mixing drum forms a processing chamber for the dual-shaft, bidirectional spiral stirring assembly to stir the raw materials, thus providing a closed stirring environment for the raw materials. The spacing between the two stirring shafts is set at 40% to 50% of the inner diameter of the mixing drum. This can avoid insufficient stirring strength of the raw materials in the middle due to excessive spacing, and avoid the risk of shaft collision due to too small a spacing. The kneading element can perform rigid kneading (suitable for hard, agglomerated raw materials) or rolling kneading (suitable for viscous slurries), stirring and kneading the raw materials between the drum wall and the shafts, and re-engaging the raw materials into the stirring flow field. 3. The cross-sectional width of the end of the scraper in the direction of rotation is smaller than that of the middle part, so that when the scraper is scraping the raw materials, the contact area between the scraping end of the scraper and the raw materials is smaller, reducing the obstruction of the scraper by the raw materials, thereby avoiding a large burden on the stirring shaft; the polytetrachloroethylene plate has self-lubricating properties, making it difficult for the raw materials to adhere to the surface of the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the dual-shaft bidirectional spiral stirring assembly in the embodiment of the present application; Figure 2 Schematic diagram of the structure of the stirring shaft in the embodiment of the present application; Figure 3 Schematic diagram of the structure of the material mixing equipment in the embodiment of the present application; Figure 4 is a schematic structural diagram of a stirring shaft in another embodiment of the present application; Figure 5 Schematic diagram of the internal structure of the material mixing equipment in the embodiment of the present application; Figure 6 It is a structural schematic diagram of the scraper plate in the embodiment of the present application.

[0027] Explanation of the accompanying drawings: 1. Double-axis bidirectional spiral stirring assembly; 11. Stirring shaft; 12. Stirring blade; 121. First blade; 122. Second blade; 2. Stirring drum; 3. Kneading assembly; 31. Connecting rod; 32. Kneading part; 4. Scraper plate; 5. Valve body; 6. Processing chamber. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 To the attached Figure 6 This application is described in further detail.

[0029] The embodiment of the present application discloses a dual-axis bidirectional spiral stirring assembly 1. Figure 1 and Figure 2 The double-shaft bidirectional spiral stirring assembly 1 includes a stirring shaft 11 and a stirring blade 12 .

[0030] like Figure 1 and Figure 2 As shown, the outer wall of the stirring shaft 11 is provided with a first screw segment and a second screw segment, and the first screw segment and the second screw segment are both distributed along the axial direction of the stirring shaft 11. The spiral directions of the first screw segment and the second screw segment are opposite. There are two stirring shafts 11, and the two stirring shafts 11 are arranged in parallel, and the two stirring shafts 11 turn in opposite directions.

[0031] like Figure 1 and Figure 2 As shown, the stirring blade 12 is used to stir the raw materials when the stirring shaft 11 rotates. The stirring blade 12 includes a first blade 121 and a second blade 122. The first blade 121 and the second blade 122 are welded to the outer wall of the stirring shaft 11 through a metal column. The first blade 121 is wound around the surface of the stirring shaft 11 along the first spiral segment, and the second blade 122 is wound around the surface of the stirring shaft 11 along the second spiral segment. The first blade 121 and the second blade 122 are intermittently arranged in the axial direction, and the intermittent interval between adjacent blades is 30% to 50% of the pitch.

[0032] Specifically, the first blade 121 and the second blade 122 are respectively arranged in the first screw segment and the second screw segment, so that when the stirring shaft 11 rotates, the raw materials can form a two-way flow path, so that the raw materials converge from the two ends of the stirring shaft 11 to the middle position of the stirring shaft 11, or the raw materials are dispersed from the middle position of the stirring shaft 11 to the two ends of the stirring shaft 11, thereby generating shear force and radial disturbance. Compared with the orderly flow of the traditional spiral stirring component, the composite flow path formed in the present application can make the raw materials form a complex motion state, improve the single flow path of the spiral stirring component, and cause the problem of insufficient mixing of the raw materials; the intermittent setting of the stirring blade 12 can periodically break the flowing raw materials, avoiding the regular flow of the raw materials as a whole. The interval treatment of the stirring blade 12 can form a discontinuous pushing path, promote the decomposition and collision of the raw materials, so that the raw materials are further mixed, and finally further improve the single flow path of the spiral stirring component, which causes insufficient mixing of the raw materials; the dynamic stirring method formed by the intermittent intervals of the blades and the reverse screw segment can also prevent the adhesion and accumulation of raw materials such as slurry on the surface of the shaft, and cooperate with the shearing effect of the double shafts to play an anti-sticking role.

[0033] Exemplarily, the pitch of the first screw segment is 45mm~155mm, and the pitch of the second screw segment is 45mm~155mm. The pitch of the first screw segment and the pitch of the second screw segment both gradually decrease from the two ends of the stirring shaft 11 to the middle of the stirring shaft 11, so that the raw materials collide in the middle position of the stirring shaft 11; the gradient setting of the first screw segment and the second screw segment can make the stirring blade 12 have a gradient, so that the raw material undergoes dynamic changes in speed and pressure during the movement. When the raw material moves from the two ends of the stirring shaft 11 (larger pitch) to the middle position, the pushing frequency of the stirring blade 12 increases with the decrease in pitch, the number of times the raw material is squeezed gradually increases, and the flow velocity gradually decreases. In the middle position (smaller pitch), the raw material forms a local high-pressure area due to the increase in pushing resistance, and raw materials in different directions collide and shear here. Combined with the radial force generated by the reverse rotation of the two shafts, the problem of insufficient mixing of raw materials caused by the single flow path of the spiral stirring component is improved.

[0034] The present application also discloses a material mixing device. Figure 2 and Figure 3 The material mixing equipment includes a mixing drum 2, a kneading component 3, a scraper 4, a valve body 5 and the above-mentioned double-shaft bidirectional spiral mixing component 1.

[0035] like Figure 2 and Figure 3As shown, the mixing drum 2 is formed by connecting two parallel cylinders, the adjacent sides of the two cylinders overlap, the wall of the overlapping part of the two cylinders is removed, and the cavities of the two cylinders are connected to form a processing chamber 6. The mixing drum 2 can form a processing chamber 6 for the dual-axis bidirectional spiral stirring assembly to stir the raw materials, thereby providing a closed stirring environment for the raw materials; illustratively, the mixing drum 2 includes but is not limited to a 304 stainless steel cylinder or a titanium alloy cylinder; the 12 groups of stirring blades in each cylinder push the raw materials to the overlapping area, forming a convection state of left cylinder pushing right and right cylinder pushing left, ensuring the uniformity of raw material stirring.

[0036] like Figure 1 and Figure 3 As shown, the double-axis bidirectional spiral stirring assembly 1 is inserted into the mixing drum 2, and the double-axis bidirectional spiral stirring assembly 1 is used to stir the raw materials in the processing chamber 6. The length of the distance between the two stirring shafts 11 is 40%~50% of the length of the inner diameter of the mixing drum 2, and the speed ratio of the two stirring shafts 11 of the double-axis bidirectional spiral stirring assembly 1 is 1:1, so as to achieve synchronous stirring of the two stirring shafts 11 and improve the uniformity of raw material mixing; in the embodiment of the present application, the two stirring shafts 11 of the double-axis bidirectional spiral stirring assembly 1 are respectively arranged in the two cylinders, and the distance between the two stirring shafts 11 is set to 40%~50% of the inner diameter of the mixing drum 2, which can avoid insufficient stirring intensity of the raw materials in the middle position due to excessive spacing, and avoid the risk of shaft collision due to too small spacing. The speed ratio of the two stirring shafts 11 is 1:1, which can achieve dynamic balance of raw material stirring, thereby ensuring uniform stirring of the raw materials and improving process stability and product consistency.

[0037] Exemplarily, one end of each stirring shaft 11 is provided with a matching transmission gear, the transmission gears on the two stirring shafts 11 have the same specifications, the transmission gears on the two stirring shafts 11 are meshed, and any transmission gear is driven by any motor to make the two stirring shafts 11 rotate synchronously.

[0038] Optionally, the two stirring shafts 11 may rotate synchronously without using a transmission gear. The two stirring shafts 11 may be driven by a differential gear box or an additional independent drive system. The speed difference may be used to achieve kneading or blending of the raw materials, thereby accelerating the physical mixing and chemical reaction processes, and improving the stirring efficiency of high-viscosity raw materials or raw materials that need to be refined and dispersed.

[0039] Optionally, the two stirring shafts 11 can also perform alternating forward and reverse motions through a differential gear box or an additionally configured independent drive system, so as to achieve reverse pushing or mixing of the raw materials by periodically switching the rotation direction.

[0040] It should be noted that the stirring shaft 11 and the stirring drum 2 are sealed by means including but not limited to mechanical sealing or magnetic sealing to prevent leakage of raw materials.

[0041] like Figure 1 and Figure 2 As shown, the kneading component 3 is spirally distributed along the stirring shaft 11, and includes a connecting rod 31 and a kneading piece 32. The connecting rod 31 is fixedly connected to the stirring shaft 11, and the kneading piece 32 is fixedly connected to the end of the connecting rod 31 away from the stirring shaft 11, or the kneading piece 32 is rotatably connected to the end of the connecting rod 31 away from the stirring shaft 11. The kneading component 3 is used to knead the raw materials when the double-axis bidirectional spiral stirring component 1 is working; the kneading piece 32 can knead rigidly, and rigid kneading is suitable for hard agglomerated raw materials, or the kneading piece 32 can roll kneading, and rolling kneading is suitable for viscous slurry, stirring and kneading the raw materials between the cylinder wall and the shaft, and re-engaging the raw materials into the stirring flow field; exemplarily, the connecting rod 31 is a metal rod, and the connecting rod 31 is welded to the stirring shaft 11.

[0042] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, the kneading piece 32 is a metal roller, and the kneading piece 32 and the connecting rod 31 are rotatably arranged at one end of the connecting rod 31 through a sleeve welded to the connecting rod 31. The kneading piece 32 can rotate relative to the connecting rod 31 to knead the raw materials; when the stirring shaft 11 drives the kneading piece 32 to rotate, the raw materials between the outer wall of the metal roller and the inner wall of the stirring drum 2 will generate radial resistance to the roller, and this resistance drives the kneading piece 32 to rotate autonomously around the connecting rod 31. Especially when encountering hard agglomerates of the raw materials, the metal roller avoids the rigid impact of the hard agglomerates of the raw materials by slipping, and at the same time crushes the hard agglomerates of the raw materials while rolling, so that the hard agglomerates of the raw materials are broken.

[0043] like Figure 4 As shown, in another embodiment of the present application, the kneading member 32 is an arc-shaped plate, which is welded to the connecting rod 31. The extension path of the kneading member 32 forms an inclination angle of 15°~30° with the axis of the stirring shaft 11. The kneading member 32 is a wear-resistant ceramic plate. The inclination angle enables the arc-shaped plate to produce oblique scraping and positive extrusion on the raw material when rotating with the shaft. The inclination direction forms an acute angle with the pushing direction of the screw segment, which can guide the raw material to flip along the arc surface and then be pushed by the subsequent blades. The inclination gradient of 15°~30° can make the kneading force change with the change of the rotation speed. For example, the higher the rotation speed, the greater the axial component of the force generated by the inclined surface, and the greater the kneading force generated when contacting the raw material, thereby adapting to the kneading requirements of raw materials with different viscosities. The selection of the wear-resistant ceramic plate material utilizes its high hardness and low friction coefficient, which not only reduces the risk of adhesion between the raw material and the surface of the kneading member 32, but also improves the wear resistance to high-hardness granular raw materials.

[0044] like Figure 5 and Figure 6As shown, the scraper plate 4 is fixedly connected to the stirring shaft 11, the length direction of the scraper plate 4 is perpendicular to the axial direction of the stirring shaft 11, the scraper plate 4 abuts against the inner wall of the stirring drum 2, and the scraper plate 4 is used to scrape off the raw materials attached to the inner wall of the stirring drum 2. There are two scraper plates 4, and the two scraper plates 4 are respectively arranged at both ends of the stirring shaft 11; when the stirring shaft 11 rotates, it can drive the scraper plate 4 to move. Since the scraper plate 4 abuts against the inner wall of the stirring drum 2, the scraper plate 4 can scrape off the raw materials attached to the inner wall of the stirring drum 2 and stir the raw materials at the same time.

[0045] It should be noted that in the embodiment of the present application, the cross-sectional widths on both sides of the scraper plate 4 are smaller than the width in the middle, and the scraper plate 4 is a polytetrachloroethylene plate; the cross-sectional width at the ends of the scraper in the direction of rotation is smaller than the width in the middle, so that in the process of scraping the raw materials, the contact area between the scraping end of the scraper and the raw materials is smaller, reducing the obstruction of the scraper by the raw materials, thereby avoiding causing a large burden on the stirring shaft 11; the polytetrachloroethylene plate has self-lubricating properties, making it difficult for the raw materials to adhere to the surface of the scraper plate 4.

[0046] like Figure 3 and Figure 5 As shown, the valve body 5 is fixedly connected to the mixing drum 2, the channel length of the valve body 5 is 5 cm to 6 cm, the inner wall of the channel of the valve body 5 is provided with a polytetrachloroethylene coating, the valve body 5 is connected to the processing chamber 6, and the valve body 5 is used to allow the raw material to flow into the processing chamber 6 to reduce the adhesion of the raw material on the flow path.

[0047] Optionally, two valve bodies 5 can be provided, both valve bodies 5 are fixedly connected to the mixing drum 2, and both valve bodies 5 are communicated with the processing chamber 6, one valve body 5 is used to supply raw materials to enter the processing chamber 6, and the other valve body 5 is used to supply raw materials to flow out of the processing chamber 6, so as to reduce the accumulation and adhesion of raw materials when entering and exiting, thereby reducing the residual raw materials at the inlet and outlet, improving the utilization rate of raw materials, facilitating the subsequent cleaning of the mixing drum 2, and maintaining the normal operation of the mixing equipment.

[0048] Optionally, an overload protection device or structure can be provided to prevent the torque of the stirring shaft 11 from exceeding the standard, thereby avoiding the shaft from twisting off, the bearing from being damaged, or the reducer gear from cracking. At the same time, it can prevent the motor from overheating and damaging the coil due to excessive stall current, thereby reducing the risk of equipment shutdown for maintenance and avoiding production accidents.

[0049] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A dual-shaft bidirectional spiral stirring assembly, characterized in that: include: A stirring shaft (11) is provided with a first screw segment and a second screw segment on its outer wall, the first screw segment and the second screw segment are both distributed along the axial direction of the stirring shaft (11), the spiral directions of the first screw segment and the second screw segment are opposite, two stirring shafts (11) are provided, the two stirring shafts (11) are arranged in parallel, and the two stirring shafts (11) rotate in opposite directions; A stirring blade (12) is used to stir the raw materials when the stirring shaft (11) rotates, the stirring blade (12) comprising a first blade (121) and a second blade (122), the first blade (121) being wound around the surface of the stirring shaft (11) along the first screw segment, the second blade (122) being wound around the surface of the stirring shaft (11) along the second screw segment, the first blade (121) and the second blade (122) being intermittently arranged in the axial direction, and the intermittent interval between adjacent blades being 30% to 50% of the screw pitch; The pitch of the first screw segment is 45 mm to 155 mm, and the pitch of the second screw segment is 45 mm to 155 mm; The pitch of the first screw segment and the pitch of the second screw segment gradually decrease from both ends of the stirring shaft (11) to the middle of the stirring shaft (11), so that the raw materials collide at the middle position of the stirring shaft (11).

2. A material mixing device, characterized in that: include: A mixing drum (2) encloses a processing chamber (6) ； The double-shaft bidirectional helical stirring assembly (1) according to claim 1, wherein the double-shaft bidirectional helical stirring assembly (1) is inserted into the stirring drum (2), and the double-shaft bidirectional helical stirring assembly (1) is used to stir the raw materials in the processing chamber (6), and the length of the distance between the two stirring shafts (11) is 40% to 50% of the length of the inner diameter of the stirring drum (2); The kneading assembly (3) is spirally distributed along the stirring shaft (11) and comprises a connecting rod (31) and a kneading piece (32). The connecting rod (31) is fixedly connected to the stirring shaft (11), and the kneading piece (32) is fixedly connected to the end of the connecting rod (31) away from the stirring shaft (11), or the kneading piece (32) is rotatably connected to the end of the connecting rod (31) away from the stirring shaft (11). The kneading assembly (3) is used to knead the raw materials when the double-shaft bidirectional spiral stirring assembly (1) is working.

3. The material mixing equipment according to claim 2, characterized in that: The kneading piece (32) is an arc-shaped plate, the kneading piece (32) is fixedly connected to the connecting rod (31), the inclination angle formed by the extension path of the kneading piece (32) and the axis of the stirring shaft (11) is 15° to 30°, and the kneading piece (32) is a wear-resistant ceramic plate.

4. The material mixing equipment according to claim 2, characterized in that: The kneading member (32) is a metal roller, and the kneading member (32) is rotatably connected to the connecting rod (31). The kneading member (32) can rotate relative to the connecting rod (31) to knead the raw materials.

5. The material mixing equipment according to claim 2, characterized in that: The invention also includes a scraper plate (4), which is fixedly connected to the stirring shaft (11), the length direction of the scraper plate (4) is perpendicular to the axial direction of the stirring shaft (11), the scraper plate (4) abuts against the inner wall of the stirring drum (2), and the scraper plate (4) is used to scrape off the raw materials attached to the inner wall of the stirring drum (2). There are two scraper plates (4), and the two scraper plates (4) are respectively arranged at the two ends of the stirring shaft (11).

6. The material mixing equipment according to claim 5, characterized in that: The cross-sectional widths of the two sides of the scraper plate (4) are smaller than the width of the middle portion, and the scraper plate (4) is a polytetrachloroethylene plate.

7. The material mixing equipment according to claim 2, characterized in that: The invention also comprises a valve body (5), the valve body (5) being fixedly connected to the mixing drum (2), the channel length of the valve body (5) being 5 cm to 6 cm, the inner wall of the channel of the valve body (5) being provided with a polytetrachloroethylene coating, the valve body (5) being in communication with the processing chamber (6), and the valve body (5) being used for allowing raw materials to flow into the processing chamber (6) so as to reduce the adhesion of the raw materials on the flow path.

8. The material mixing equipment according to claim 2, characterized in that: The mixing drum (2) is formed by connecting two parallel drums, with adjacent sides of the two drums overlapping, the wall of the overlapping portion of the two drums removed, and the cavities of the two drums connected. The two mixing shafts (11) of the double-shaft bidirectional spiral mixing assembly (1) are respectively arranged in the two drums.

9. The material mixing equipment according to claim 2, characterized in that: The rotational speed ratio of the two stirring shafts (11) of the double-shaft bidirectional spiral stirring assembly (1) is 1:1, so as to achieve synchronous stirring of the two stirring shafts (11) and improve the uniformity of raw material mixing.

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