Low-temperature mixing device for road sealant

Abstract

The present application belongs to the technical field of road sealant processing equipment, and particularly relates to a low-temperature mixing device for road sealant. The device comprises a rack and a mixer box arranged on the rack, and a mixing inner cylinder and a single-shaft mixing component are arranged in the mixer box. A bottom shield is arranged at the bottom of the mixer box, and a frame shield for conveying temperature control medium is arranged along the side of the mixer box, and the two shields cooperate to form a three-dimensional low-temperature protection field; the mixing component comprises a central rotating shaft and a stirring disc body arranged on the central rotating shaft, and a gap groove is formed between adjacent disc bodies, and a swingable hammer block and a self-rotating star-shaped tooth block are arranged in the groove, and the hammer blocks and the tooth blocks in adjacent grooves are arranged in a staggered manner. A rotary cutter disc with a sawtooth edge is arranged at the tail end of the device, and is connected with a discharge falling hopper of an external air cooling device. The present application constructs a surrounding three-dimensional low-temperature environment, avoids high-temperature damage to the material, prevents bridging of the feeding material through multi-chamber shunting, greatly improves the dispersion uniformity of high-viscosity material through the staggered arrangement of the mixing components, and comprehensively improves the running stability of the device and the quality of the finished product.

Description

Technical Field

[0001] This invention relates to the field of road sealant processing equipment technology, specifically a low-temperature mixing device for road sealant. Background Technology

[0002] The low-temperature mixing and processing of road sealants requires extremely strict control over the heat sensitivity of the equipment and high precision in molding and cutting. Currently, most mainstream equipment in the industry uses a twin-screw (or twin-rotor) continuous mixing mill combined with a conventional flat-blade pelletizing mechanism for processing.

[0003] However, the existing structure has certain drawbacks in practical applications. The strong meshing zone of the screw structure is inevitably located at the geometric center axis of the barrel. This deep region is furthest from the outer cooling channels, resulting in an excessively long heat dissipation path and extremely low heat exchange efficiency. This makes the central meshing zone prone to forming a local overheating dead zone. Under continuous high-speed mixing, the accumulated high temperature can easily trigger premature cross-linking reactions of the internal components of the road sealant, causing irreversible scorching and scrapping problems, seriously damaging the material properties. The low-temperature rubber strip after extrusion molding has extremely strong viscoelasticity. When conventional flat-blade cutting blades at the tail end are used for rotary cutting, the blades cannot effectively cut into the surface of the rubber, often resulting in severe blade sticking and stringing. Therefore, there is an urgent need to develop a dedicated road sealant mixing device that can fundamentally solve the problem of overheating and scorching in the mixing center and effectively handle the smooth cutting of low-temperature viscoelastics. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature mixing apparatus for road sealant to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A low-temperature mixing device for road sealant includes a high-intensity mixing system and an extrusion molding system. The high-intensity mixing system includes an equipment frame and a mixing chamber mounted thereon. The mixing chamber is equipped with a mixing inner cylinder and a single-shaft mixing component placed therein. The bottom of the inner cavity of the mixing machine box is provided with an upwardly raised bottom cover that covers the bottom of the mixing inner cylinder; The mixing machine box is provided with an outer wing temperature control unit along the side of the box body. The outer wing temperature control unit includes a temperature control input pipe that outputs the temperature control medium to the temperature control receiving plate and a frame cover stacked on the outside of the temperature control receiving plate and wrapped around the outer periphery of the mixing inner cylinder side wing. The bottom cover and the frame cover cooperate with each other to construct a surrounding three-dimensional low temperature protection field around the mixing inner cylinder. The single-shaft mixing machine includes a central rotating shaft and several mixing discs sleeved thereon. A disc gap groove is formed between adjacent mixing discs. A mixing hammer block and a star-shaped tooth block are installed at equal angles in each disc gap groove, and the mixing hammer block and the star-shaped tooth block in adjacent disc gap grooves are arranged in a spatially staggered manner.

[0006] As a further aspect of the present invention: a high-power motor is provided on the outer edge of the equipment frame, and a drive coupling is provided on the drive end of the high-power motor; The outer wall of the mixing machine box is provided with shaft support structures on both sides. The power input end of the single-shaft mixing machine component is provided with a transmission input shaft. The transmission input shaft is located in the shaft support structure and is connected to the drive coupling.

[0007] As a further aspect of the present invention: the star-shaped toothed block has a star-shaped toothed structure and is installed on the edge of the stirring disc in a rotatable manner; The mixing hammer has a hammer-shaped structure, with one end installed at the edge of the mixing disc via a positioning shaft, and is configured to generate a centrifugal outward swinging tendency when the mixing disc rotates.

[0008] As a further aspect of the present invention: the side wing of the mixing machine box is provided with a vertical feed hopper, and the bottom of the vertical feed hopper is provided with a material distribution partition, which divides the vertical feed hopper into several material distribution chambers to uniformly inject materials into the mixing inner cylinder.

[0009] As a further aspect of the present invention: inner wall mounting seats are provided on both sides of the mixing machine box, and a plurality of fixing locking parts are provided on the inner wall mounting seats. Correspondingly, outer wall fixing seats are provided on the outer side of the mixing inner cylinder, and the fixing locking parts are fixedly locked to the outer wall fixing seats.

[0010] As a further aspect of the present invention: the extrusion molding system includes: Extruded support; The conveying bin and temperature-controlled bin are mounted on the extrusion support; The extrusion screw assembly is located inside the conveying hopper; An extrusion barrel is located inside the temperature-controlled feed box, and the extrusion barrel is connected to the extrusion screw assembly via a transmission connecting cylinder.

[0011] As a further aspect of the present invention: a turnover connection section is provided on the side edge of the mixing inner cylinder facing downward, and a discharge connection platform is provided in the turnover connection section. The discharge connection platform is connected to the turnover conveying unit through a discharge flange, and the bottom of the discharge connection platform is inclined with an arc-shaped guide groove.

[0012] As a further aspect of the present invention, it also includes a cutting unit, the cutting unit comprising: Connect the outer casing and the discharge hopper; A rotating cutter disc is disposed within the docking housing, and the rotating cutter disc is driven to rotate by a cutting drive motor; A cutting blade assembly is disposed around the rotating cutter head. The cutting blade assembly includes a blade mounting seat and a blade support. A strip-shaped cutting blade is provided on the side of the blade support facing the extrusion end. The cutting edge of the strip-shaped cutting blade has serrated edges.

[0013] As a further aspect of the present invention: the lower end of the discharge hopper is connected to a pneumatic cooling device, which is configured to introduce airflow at the moment the material falls to perform forced air pre-cooling.

[0014] As a further aspect of the present invention: the inner cavity of the mixing chamber is filled with heat-insulating material, and through the cooperation of the bottom cover and the frame cover, a double-layer heat-insulating structure is formed on the periphery of the mixing inner cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are: At the temperature control and mixing architecture level, the device abandons the traditional twin-screw design that is prone to generating a central heat dissipation dead zone, and innovatively adopts a single-axis peripheral mixing layout. With the help of the complementary cooperation between the bottom shield and the side wing frame shield to form a surrounding three-dimensional low temperature protection field, the core shearing area is effectively transferred to the peripheral circumferential space close to the cooling medium, which greatly improves the efficiency of frictional heat removal. In the core mixing process, centrifugal swinging hammers and self-rotating star-shaped toothed blocks are arranged in a spatially cross-staggered manner between adjacent gaps to construct a high-strength three-dimensional shearing network. This not only forces the material to bend and turn back, greatly improving the dispersion uniformity of high-viscosity road sealant, but also fundamentally eliminates the hidden danger of premature cross-linking and scorching of resin caused by local overheating.

[0016] The machine employs a long, flat, multi-chamber flow distribution structure at the front end to solve the bridging problem of low-temperature materials during feeding. At the rear end, an independent temperature-controlled extrusion chamber and an arc-shaped guide groove ensure smooth material flow during forming. In the cutting stage, a serrated cutting disc combined with forced air cooling replaces traditional chopping with low-energy progressive sawing, completely eliminating sticking and stringing and achieving rapid surface curing of the granules. Through multi-dimensional structural coordination and precise temperature control, the machine significantly improves the mixing quality, production safety, and overall energy efficiency of heat-sensitive sealants.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the low-temperature mixing device for road sealant provided in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the mixing chamber provided in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the mixing inner cylinder provided in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of a single-shaft mixing machine provided in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of a uniaxial mixing machine component provided in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the cross-sectional structure of the cutting unit provided in an embodiment of the present invention.

[0025] Figure 7 For the present invention Figure 6 Enlarged view of the structure of region A in the middle.

[0026] In the diagram: 1. High-intensity mixing system; 2. Mixing machine housing; 3. Mixing inner cylinder; 4. Single-shaft mixing machine components; 5. Extrusion molding system; 6. Cutting unit; 7. Transfer conveying unit; 8. Outer wing temperature control unit; 11. Equipment frame; 12. High-power motor; 13. Drive coupling; 14. Shaft support structure; 15. Transmission input shaft; 21. Vertical feed hopper; 22. Distribution partition; 23. Distribution chamber; 24. Housing bottom plate; 25. Bottom cover; 26. Inner wall mounting seat; 27. Fixing lock; 28. Outer wall fixing seat; 31. Transfer connection area; 32. Discharge connection table; 33. Discharge flange; 34. Guide. 41. Groove; 42. Central shaft; 43. Disc mounting base; 44. Mixing disc; 45. Disc gap groove; 46. Mixing hammer block; 57. Star-shaped toothed block; 58. Conveying hopper; 59. Transmission connecting cylinder; 50. Extrusion screw assembly; 51. Extrusion barrel; 52. Temperature-controlled hopper; 53. Extrusion bracket; 64. Connecting shell; 65. Discharge hopper; 66. Cutting drive motor; 67. Rotary cutter head; 68. Cutting blade assembly; 69. Blade mounting base; 60. Blade support; 61. Strip cutting blade; 62. Cutting edge serration; 83. Temperature control input pipe; 84. Temperature control receiving plate; 85. Frame cover. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, examples of which are illustrated in the drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or identical elements.

[0028] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] Example 1; Please see Figures 1 to 4A low-temperature mixing apparatus for road sealant is provided, comprising a high-intensity mixing system 1 and an extrusion molding system 5. As the core supporting unit, the high-intensity mixing system 1 includes an equipment frame 11, on which a mixing chamber 2 is securely mounted. A mixing inner cylinder 3 is nested and suspended inside the mixing chamber 2, and a single-shaft mixing component 4 is centrally installed inside the mixing inner cylinder 3. To overcome the enormous load caused by the low-temperature, high-viscosity material, a power platform extends outward from the outer edge of the equipment frame 11, on which a high-power motor 12 is fixedly mounted. This motor 12 preferably adopts a high-torque motor structure with frequency conversion control. The high-power motor 12 is equipped with a drive coupling 13 at its drive end. Meanwhile, shaft support structures 14 are symmetrically arranged on both sides of the outer wall of the mixing machine box 2. The drive end of the single-shaft mixing machine component 4 is equipped with a transmission input shaft 15. The transmission input shaft 15 is limited and installed in a low-temperature resistant bearing inside the shaft support structure 14 and is connected to the drive coupling 13. This ensures that the equipment can adapt to the slight deformation of the shaft system caused by temperature difference and ensures the smooth and efficient transmission of power.

[0031] Regarding the material feeding and structural locking at the front end, a feeding structure is provided above the side wings of the mixing chamber 2, which includes a vertical feeding hopper 21. This hopper has a long, flat opening structure, which increases the surface area to effectively prevent material bridging. A material distribution baffle 22 is provided at the bottom of the vertical feeding hopper 21, which divides the feeding channel into multiple independent narrow slit-shaped material distribution chambers 23. For the stability of the mechanical structure, inner wall mounting seats 26 are fixedly installed on the inner walls on both sides of the mixing chamber 2. The mounting seats 26 are provided with multiple sets of fixing locking parts 27 made of bolts. Correspondingly, an outer wall fixing seat 28 is provided on the outer wall of the mixing inner cylinder 3. The outer wall fixing seat 28 is locked by the fixing locking parts 27, so as to realize the suspension and firm constraint of the heavy-duty mixing inner cylinder 3 inside the mixing chamber 2, and prevent mechanical displacement during high-load operation.

[0032] Temperature is a key factor in achieving low-temperature mixing of sealant. The inner cavity of the mixing chamber 2 is filled with insulating material, creating the first layer of low-temperature internal environment for the mixing inner cylinder 3. At the bottom of the inner cavity of the mixing chamber 2, an arc-shaped pot-shaped bottom cover 25 is mounted on the bottom plate 24, which is closely fitted to the bottom area of ​​the mixing inner cylinder 3, forming the first layer of bottom insulation structure. At the same time, an outer wing temperature control unit 8 is also configured on the side of the mixing chamber 2, which specifically includes several temperature control input pipes 81 for inputting media. The temperature control input pipes 81 deliver low-temperature temperature-controlled liquid or gas to the temperature control receiving plate 82; a frame cover 83 with a horizontal frame structure is stacked and fixed on the outside of the temperature control receiving plate 82. The frame cover 83 completely encloses the outer perimeter of the side wings of the mixing inner cylinder 3. Through the physical cooperation between the bottom cover 25 and the frame cover 83 on the side wings, a "U"-shaped three-dimensional wrapping is implemented on the bottom and all sides of the mixing inner cylinder 3, forming a tight low-temperature protection field with double-layer superposition of inner and outer layers.

[0033] The high-power motor 12 is started, and the power generated by the motor 12 is transmitted to the transmission input shaft 15 via the drive coupling 13, thereby driving the single-shaft mixing machine 4 to rotate at high speed inside the mixing inner cylinder 3. At the same time, the road sealant to be mixed enters through the vertical feed hopper 21, and is evenly divided into multiple fine streams when passing through the distribution baffle 22, and is smoothly injected into the interior of the mixing inner cylinder 3 through each distribution chamber 23. Meanwhile, the temperature control input pipe 81 continuously injects a low-temperature medium into the temperature control receiving plate 82, which, together with the physical isolation of the bottom cover 25, forms a sustainable and uniform low-temperature working environment, in which the material is immediately placed for low-temperature mixing after entering.

[0034] This embodiment fully utilizes the principles of heat conduction isolation and structural force locking. The arc-shaped pot-shaped bottom cover 25 and the side frame cover 83 form a sealed space, using a low-temperature medium to efficiently dissipate heat from the outer wall of the inner cylinder. This effectively prevents heat energy from penetrating and damaging the physicochemical properties of the road sealant when the single-shaft mixing machine 4 generates huge shear friction heat during high-speed operation. At the same time, the multi-chamber narrow-slit design formed by the material distribution baffle 22 greatly reduces the cross-sectional area of ​​the material entering. Utilizing the principle of fluid pressure difference, the entering material is evenly dispersed, fundamentally solving the problems of material bridging, accumulation, and agglomeration caused by the large-aperture feeding of traditional devices.

[0035] The main beneficial effect of this embodiment is that the bottom cover 25 and the frame cover 83 work together to implement a "U"-shaped three-dimensional wrapping of the mixing inner cylinder 3. Combined with the inner cavity insulation material, this constructs a multi-layered and rigorous low-temperature protection field, ensuring that the equipment can accurately maintain the specific low-temperature mixing environment required for the sealant during long-term continuous operation. The design of the material distribution chamber 23 effectively solves the material feeding bottleneck and prevents material jamming. The shaft support structure 14 is equipped with low-temperature resistant bearings, which ensures good transmission coaxiality and structural safety even under high speed and alternating high and low temperature thermal expansion and contraction conditions, greatly improving the service life of the equipment.

[0036] Example 2; Please see Figure 4 and Figure 5 Based on Embodiment 1, this embodiment further narrows down and discloses in detail the specific structure and functional layout of the core single-axis mixing machine component 4.

[0037] This embodiment abandons the structural paradigm of traditional twin-screw mixing equipment. Traditional twin-screw equipment often places the core, high-strength meshing zone at the center axis of the barrel. This area is located at the deepest part of the mechanical structure, where heat easily accumulates and is extremely difficult to cool by the external temperature control unit, easily forming localized high-temperature points that can cause sealant to fail.

[0038] This invention employs a single-shaft eccentric mixing structure. The single-shaft mixing unit 4 includes a central rotating shaft 41 located at the center, and multiple mixing discs 43 equidistantly mounted on the central rotating shaft 41. Each mixing disc 43 is securely fixed to the shaft of the central rotating shaft 41 via a disc mounting seat 42 with a flange structure. This layout can transfer the most important mixing space to the outer area of ​​the barrel, bringing it closer to the external low-temperature protection zone, thus perfectly avoiding the cooling dead zone. Adjacent mixing discs 43 maintain a specific distance, forming disc gap grooves 44 for entraining materials. In each disc gap groove 44 area, mixing hammers 45 and star-shaped toothed blocks 46 are installed at equal angles and alternately. Among them, the star-shaped toothed block 46 has a star-shaped main body with sharp teeth and is installed on the edge of the mixing disc 43 in a rotatable manner; while the mixing hammer block 45 has a block hammer-shaped structure, one end of which is freely hinged to the edge of the mixing disc 43 through a positioning shaft, and its swing area is also evenly distributed in the outer annular space. More importantly, the gap grooves 44 between adjacent discs adopt a spatially staggered arrangement, that is, the radial side edge of the mixing hammer block 45 in a certain gap groove corresponds exactly to the side edge of the star-shaped toothed block 46 in the adjacent gap groove, forming a distributed network of points throughout the space.

[0039] When the high-power mixing system 1 is started, the high-power motor 12 drives the central shaft 41 to rotate all the mixing discs 43 at high speed. The star-shaped toothed blocks 46 located in the disc gap grooves 44 generate centrifugal rotation as the discs revolve; at the same time, the mixing hammers 45, under the action of huge centrifugal force, generate an outward swinging tendency around the hinged positioning shaft. After the high-viscosity road sealant enters the mixing inner cylinder 3, it is forcibly drawn into these disc gap grooves 44 distributed around the periphery. Due to the misalignment of the components in adjacent gap grooves, the sealant is constantly subjected to the impact of the "dynamic swinging hammers" and the scraping of the "high-speed rotating star teeth" as it passes through different levels of gap grooves. During this process, the three-dimensional low-temperature field constructed by the outer wing temperature control unit 8 and the bottom cover 25 can use its wide surface area to directly and effectively exchange heat with the surrounding high-speed rotating mixing area, quickly carrying away the large amount of frictional heat generated during the mixing process and preventing heat from accumulating locally.

[0040] This embodiment utilizes the principles of heat transfer and rheology. During high-speed mixing of road sealant, intense friction between polymer chain segments inevitably generates a large amount of heat. In traditional twin-screw structures, the long and deep heat dissipation path in the central meshing zone often leads to uncontrolled central temperature rise, which in turn activates the vulcanization accelerator in the sealant, causing irreversible premature cross-linking (i.e., scorching) between the resin and the vulcanizing agent. This embodiment utilizes the structural characteristics of the hammers and toothed blocks arranged on the periphery to convert the main mechanical energy into surface energy and shear force. Simultaneously, leveraging their wide distribution, combined with the temperature-controlled fluid of the outer wing temperature control unit 8, a highly efficient dynamic thermal balance system is formed, fundamentally eliminating dead zone overheating. Regarding high dispersion capability, the outward swinging action of the hammers, relying on centrifugal force to apply transient large impacts, effectively disperses large clumps of sealant; while the self-rotating scraping of the star-shaped toothed blocks refines the micro-dispersion. The spatially staggered layout of these two components prevents the material from traveling straight through the cavity, forcing it to be constantly squeezed, turned, and impacted, constructing a high-strength three-dimensional shear network. This "cold processing, strong dispersion" mechanical model not only ensures the uniformity of mixing, but also precisely controls the temperature within the material safety threshold, perfectly balancing efficiency and quality.

[0041] This embodiment avoids the central overheating dead zone that is easily caused by the centerline meshing of traditional twin-screw extruders, completely eliminating the risk of premature cross-linking and scorching of the sealant due to localized overheating. This makes the device of this invention highly adaptable and safe for processing heat-sensitive polymer materials. While avoiding overheating, the interlocking of the outwardly swinging hammers and the rotating star-shaped teeth in space still constructs an extremely powerful three-dimensional dynamic shearing network. This achieves extremely high dispersion efficiency and mixing uniformity for highly viscous materials, while effectively avoiding stress concentration at a single structural point that could lead to a surge in localized heat. The staggered arrangement of the outer periphery effectively extends the radial return motion trajectory of the material, significantly increasing the effective mixing stroke within a limited axial dimension. This allows mixing to be completed at lower and safer speeds, further reducing power load and mechanical friction heat generation, and strongly ensuring the production output of high-quality road sealant.

[0042] Example 3; Please see Figure 2 and Figure 3 This embodiment further specifies the low-temperature physical transfer and quantitative extrusion structure from the mixing inner cylinder 3 to the extrusion molding system 5.

[0043] After the mixing operation is completed in the mixing inner cylinder 3, a transfer connection section 31 is opened on its side facing downward. A discharge connection platform 32 is provided in this section. The lower end of the discharge connection platform 32 forms a sealed physical connection with the transfer conveying unit 7 through the discharge flange 33. In order to solve the problem of high viscosity material retention during discharge, an arc-shaped guide slot 34 is provided at the bottom of the discharge connection platform 32.

[0044] Material is fed into extrusion molding system 5 via turnover conveyor unit 7. This system includes a conveying hopper 51 and a temperature-controlled hopper 55, both mounted on an extrusion support 56. The conveying hopper 51 receives material from the upstream turnover conveyor unit 7 and houses an extrusion screw assembly 53 for screw extrusion and material propulsion. Simultaneously, an extrusion barrel 54 is arranged parallel to the material inside the temperature-controlled hopper 55. This extrusion barrel 54 is mechanically linked to the extrusion screw assembly 53 via a rigidly or flexibly connected transmission connecting cylinder 52. To ensure the performance of the extruded product, the temperature-controlled hopper 55 also has an independent temperature control module capable of independently regulating the ambient temperature of the extrusion section.

[0045] After the sealant in the mixing inner cylinder 3 completes low-temperature mixing, due to the continuous pushing of subsequent materials and internal pressure, the rubber compound enters the turnover connection zone 31. Guided smoothly along the arc-shaped guide groove 34, the rubber compound passes sequentially through the discharge connection table 32 and the discharge flange 33, smoothly flowing to the turnover conveying unit 7. Next, the rubber compound enters the conveying hopper 51, where, under the powerful thrust of the rotating extrusion screw assembly 53, it is continuously squeezed forward and enters the extrusion barrel 54. Throughout the extrusion process, the temperature-controlled hopper 55 monitors and adjusts the external temperature of the extrusion section, ensuring that the rubber compound does not experience temperature runaway due to intense frictional heat during extrusion molding. This, in turn, enables stable and continuous extrusion operations through the linkage of the transmission connecting cylinder 52.

[0046] This embodiment utilizes the principle of gravity-driven flow and the principle of spatial flow velocity control. The design of the arc-shaped guide slot 34 uses local geometric streamlines to physically correct the flow direction of high-viscosity materials, eliminating right-angle dead angles and turbulence, thereby achieving low-resistance material conveying. At the same time, the independent temperature-controlled material box 55, together with the conveying material box 51, constructs a "sandwich temperature-controlled" extrusion environment. The principle of heat conduction balance is used to precisely offset the mechanical frictional heat energy generated by the high-speed rotation of the extrusion screw assembly 53, ensuring that the material remains in the optimal viscous flow state in the final process before curing.

[0047] Example 4; Please see Figure 1 , Figure 6 and Figure 7 This embodiment further specifies and details the cutting unit 6 at the tail end of the device and its auxiliary pre-cooling structure.

[0048] The unit includes a docking housing 61 and a discharge hopper 62. The docking housing 61 is physically connected to the extrusion end of the temperature-controlled material box 55. A cutting drive motor 63 is arranged inside the docking housing 61, and the power output end of the drive motor 63 drives a high-speed rotating cutter head 64. Multiple sets of cutting blade assemblies 65 are evenly installed around the periphery of the rotating cutter head 64 at equal angles. Specifically, the cutting blade assembly 65 includes a blade mounting seat 651 welded or bolted to the rotating cutter head 64, and a blade support 652 fixed to the blade mounting seat 651. On the side of the blade support 652 facing the material extrusion end, multiple strip-shaped cutting blades 653 are arranged at equal intervals. More importantly, the cutting edge of each strip-shaped cutting blade 653 is further equipped with continuous and fine serrations 654.

[0049] In addition, the lower opening of the discharge hopper 62 is connected to an external powerful air cooling device, which is set up independently to complete the appearance treatment at the moment the material falls.

[0050] The continuous low-temperature rubber strip extruded by the extrusion molding system 5 directly enters the rotating area of ​​the docking shell 61. At this time, the cutting drive motor 63 drives the rotating cutter head 64 to rotate at high speed, and the rotating cutter head 64 drives the cutting blade assembly 65 on its outer periphery to sweep across the end face of the rubber strip at high speed. During this process, the strip-shaped cutting blade 653 and its fine serrations 654 act on the rubber strip, cutting it into small pellets of a fixed length. The cut rubber pellets fall naturally into the discharge hopper 62 below under their own gravity. At the same time, the external high-power air-cooling equipment is activated. At the moment the rubber pellets fall from the discharge hopper 62, a high-speed low-temperature airflow is introduced to fully and forcibly coat the rubber pellets, so that the surface temperature drops rapidly and the shape is fixed.

[0051] This embodiment utilizes the principles of sawing mechanics and rapid airflow heat transfer. At low temperatures, road sealant exhibits significant viscoelasticity and high hardness. Using traditional flat-blade blades for "cutting" easily leads to material sticking to the blade, stringing, and generating extremely high instantaneous impact loads. The design of the saw teeth 654 transforms traditional impact cutting into continuous, reciprocating, progressive micro-cutting. The tiny sharp angles of the teeth pierce the surface of the sealant strip, effectively reducing the cutting pressure. Simultaneously, the discharge hopper 62, combined with forced airflow convection, utilizes the phase change cooling principle to remove a large amount of heat the instant the material is cut away.

[0052] The introduction of the serrated cutting edge 654 enables a "sawing" cut for low-temperature, high-hardness sealants, rather than a harsh "chopping" process. This significantly reduces the load and energy consumption of the cutting drive motor 63, and effectively avoids the sticking and stringing phenomena caused by the viscoelastic properties of low-temperature sealants, ensuring smooth particle surfaces, individual particle separation, and no burrs. Secondly, the combination of the discharge hopper 62 and the powerful air-conveyed cooling equipment allows a hardened, non-sticky micro-shell to quickly form on the surface of the cut small sealant particles, greatly facilitating subsequent packaging and storage, and preventing the material from becoming sticky again due to temperature changes during transportation and packaging. The synergistic effect of multiple components in the entire device comprehensively improves the output quality and production efficiency of road sealants.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-temperature mixing apparatus for road sealant, comprising a high-intensity mixing system (1) and an extrusion molding system (5), wherein the high-intensity mixing system (1) comprises an equipment frame (11) and a mixing chamber (2) mounted thereon, wherein the mixing chamber (2) is provided with a mixing inner cylinder (3) and a single-shaft mixing component (4) placed therein; characterized in that: The bottom of the inner cavity of the mixing machine box (2) is provided with a bottom cover (25) that is raised upward and covers the bottom of the mixing inner cylinder (3). The mixing machine box (2) has an outer wing temperature control unit (8) on its side. The outer wing temperature control unit (8) includes a temperature control input pipe (81) that outputs a temperature control medium to the temperature control receiving plate (82) and a frame cover (83) stacked on the outside of the temperature control receiving plate (82) and wrapped around the outer wing of the mixing inner cylinder (3). The bottom cover (25) and the frame cover (83) cooperate with each other to construct a surrounding three-dimensional low temperature protection field around the mixing inner cylinder (3). The single-shaft mixing machine (4) includes a central rotating shaft (41) and a plurality of mixing discs (43) sleeved thereon. A disc gap groove (44) is formed between adjacent mixing discs (43). A mixing hammer block (45) and a star-shaped toothed block (46) are installed at equal angles in each disc gap groove (44), and the mixing hammer block (45) and the star-shaped toothed block (46) in adjacent disc gap grooves (44) are arranged in a spatially cross-staggered manner.

2. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that: A high-power motor (12) is provided on the outer edge of the equipment frame (11), and a drive coupling (13) is provided on the drive end of the high-power motor (12). The outer wall of the mixing machine box (2) is provided with shaft support structures (14) on both sides. The power input end of the single-shaft mixing machine (4) is provided with a transmission input shaft (15). The transmission input shaft (15) is located in the shaft support structure (14) and connected to the drive coupling (13).

3. The low-temperature mixing apparatus for road sealant according to claim 2, characterized in that: The star-shaped toothed block (46) has a star-shaped toothed structure and is installed on the edge of the stirring disc (43) in a rotatable manner; The mixing hammer block (45) has a hammer-shaped structure, and one end of it is installed at the edge of the mixing disc (43) through a positioning shaft, and is configured to generate a centrifugal outward swing tendency when the mixing disc (43) rotates.

4. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that: The side wing of the mixing machine box (2) is provided with a vertical feed hopper (21), and the bottom of the vertical feed hopper (21) is provided with a material distribution partition (22). The material distribution partition (22) divides the vertical feed hopper (21) into several material distribution chambers (23) to uniformly inject materials into the mixing inner cylinder (3).

5. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that: The mixing machine box (2) has inner wall mounting seats (26) on both sides of the inner wall, and a number of fixing locks (27) are provided on the inner wall mounting seats (26). The outer wall fixing seat (28) is provided on the outer wall of the mixing inner cylinder (3). The fixing locks (27) are fixedly locked with the outer wall fixing seat (28).

6. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that, The extrusion molding system (5) includes: Extruded bracket (56); The conveying bin (51) and the temperature-controlled bin (55) are mounted on the extrusion support (56). An extrusion screw assembly (53) is provided inside the conveying bin (51). An extrusion cylinder (54) is located inside the temperature-controlled material box (55), and the extrusion cylinder (54) is connected to the extrusion screw assembly (53) through a transmission connecting cylinder (52).

7. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that: The mixing inner cylinder (3) has a turnover connection section (31) located on the side edge facing downward. The turnover connection section (31) is provided with a discharge connection table (32). The discharge connection table (32) is connected to the turnover conveying unit (7) through the discharge flange (33). The bottom of the discharge connection table (32) is inclined and has an arc-shaped guide slot (34).

8. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that, It also includes a cutting unit (6), which comprises: The docking shell (61) and the discharge hopper (62) are connected. A rotating cutter head (64) is disposed inside the docking housing (61), and the rotating cutter head (64) is driven to rotate by a cutting drive motor (63); A cutting blade assembly (65) is provided on the periphery of the rotating cutter head (64). The cutting blade assembly (65) includes a blade mounting seat (651) and a blade support (652). The blade support (652) is provided with a strip-shaped cutting blade (653) on the side facing the extrusion end. The cutting edge of the strip-shaped cutting blade (653) has a serrated edge (654).

9. The low-temperature mixing apparatus for road sealant according to claim 8, characterized in that: The lower end of the discharge hopper (62) is connected to a pneumatic cooling device, which is configured to introduce airflow for forced air pre-cooling at the moment the material falls.

10. The low-temperature mixing apparatus for road sealant according to claim 1, characterized in that: The inner cavity of the mixing machine box (2) is filled with heat-insulating material. Through the cooperation of the bottom cover (25) and the frame cover (83), a double-layer heat-insulating structure is formed on the outer periphery of the mixing inner cylinder (3).

Images