A plant-mixed cold-recycled asphalt mixture stirring device

Abstract

The present application relates to cold regeneration equipment technical field, disclose a kind of plant mixes cold regeneration asphalt mixture stirring device, including vertically distributed dry mixing zone and wet mixing zone, the dry mixing zone is located above wet mixing zone, the dry mixing zone includes dry mixing pot, and the bottom of the dry mixing pot is equipped with the material drop channel that can be opened or closed, further including two groups of installation in dry mixing pot and can relatively rotate stirring shaft, and the opposite end of two groups of stirring shaft is fixed with transfer fan blade, the outer wall of the stirring shaft is intervally provided with multiple arc surface first stirring blade and second stirring blade, and the first stirring blade and second stirring blade can be switched back and forth between stirring state and conveying state.The present application is divided into vertically distributed dry mixing zone and wet mixing zone by stirring device, realizes the dry and wet separation in space, eliminates the interference of wet residue to next pot dry mixing, simultaneously overlaps the timing of dry mixing zone and wet mixing zone by parallel operation in time, improves equipment capacity and continuous production efficiency.

Description

Technical Field

[0001] This invention relates to the field of cold recycling equipment technology, specifically to a mixing device for plant-mixed cold recycled asphalt mixture. Background Technology

[0002] Plant-mixed cold recycling involves transporting old asphalt pavement materials to a mixing plant, where they undergo pretreatment such as crushing and screening. Then, they are mixed at room temperature with new materials, cement, water, and emulsified asphalt in a certain proportion to form a mixed recycled material, thus realizing the recycling of waste materials.

[0003] Currently, existing plant-mixed cold recycling processes generally use twin-shaft horizontal mixing equipment. The specific process is as follows: RAP aggregate (recycled old asphalt pavement material) + new material + cement → dry mixing → adding water → adding emulsified asphalt → wet mixing → finally unloading after forming mixed recycled material.

[0004] However, the following problems still exist in the actual operation of this process:

[0005] 1. After the previous wet mixing is completed, the inner wall of the mixing pot and the surface of the paddle are left with wet mixture. When the next dry mixing is carried out, the cement powder will be preferentially adsorbed on the wet residue surface, resulting in a reduction of the effective cement actually participating in the dry mixing and a drift in the mix ratio, which in turn leads to the defect of poor dry mixing uniformity.

[0006] Second, traditional twin-shaft mixers use fixed blades and constant speed, and the material movement trajectory is predictable. However, there is a dead zone in the "mixing chord" during the dry mixing stage, which makes it difficult to achieve microscopic uniform distribution of RAP aggregate, new material and cement. This leads to cement forming cement lumps when it comes into contact with water during the wet mixing stage, resulting in a black and white mixture in the final mixture. Summary of the Invention

[0007] The purpose of this invention is to provide a mixing device for cold recycled asphalt mixtures in a plant, so as to solve at least one technical problem existing in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a plant-mixed cold recycled asphalt mixture mixing device, comprising a vertically distributed dry mixing zone and a wet mixing zone, wherein the dry mixing zone is located above the wet mixing zone, the dry mixing zone includes a dry mixing pot, and the bottom of the dry mixing pot is provided with a material discharge channel that can be opened or closed, and also includes two sets of mixing shafts installed inside the dry mixing pot and capable of rotating relative to each other, wherein transfer fan blades are fixed at opposite ends of the two sets of mixing shafts, and multiple arc-shaped first mixing blades and second mixing blades are spaced apart on the outer wall of the mixing shafts, and the first mixing blades and second mixing blades can switch back and forth between mixing state and conveying state, wherein: in the mixing state, the first mixing blades and second mixing blades are both located on one side of the mixing shaft; in the conveying state, the first mixing blades and second mixing blades are respectively located on both sides of the mixing shaft, and together form a spiral conveying auger, the two sets of spiral conveying augers and the two transfer fan blades cause the mixture to be circulated and conveyed in the dry mixing pot.

[0009] Optionally, the stirring shaft includes a core shaft and a sleeve shaft that are rotatably inserted into each other, and the two ends of the sleeve shaft pass through the outer walls of both sides of the dry mixing pot and are rotatably connected to the through-holes of the outer walls of both sides of the dry mixing pot. The second stirring blades are arranged and fixed on the outer wall of the sleeve shaft, and the first stirring blades are arranged and fixed on the outer wall of the core shaft by means of mounting parts. The outer wall of the sleeve shaft is provided with a hollow groove for the mounting parts to pass through and move.

[0010] Optionally, a switching assembly is also included, comprising a first gear fixed to the end of the spindle and a second gear fixed to the outer wall of the sleeve shaft, wherein the first gear and the second gear have the same design, a rocker arm is rotatably sleeved on the outer wall of the spindle, a transmission gear is rotatably mounted on the outer wall of the rocker arm, the transmission gear meshes with both the first gear and the second gear, a connector is rotatably connected to the end of the rocker arm away from the spindle, and a telescopic cylinder is fixed to the outer wall of the dry mixing pot, wherein the output end of the telescopic cylinder is vertically designed and rotatably connected to the free end of the connector.

[0011] Optionally, a reinforcing component is also included, comprising a groove and a slot formed on the outer wall of the sleeve shaft near the hollowed-out groove, wherein the groove and slot are designed to be parallel to the axis of the sleeve shaft, a reinforcing strip is slidably installed on the inner wall of the groove, and a recess is formed on the outer wall of the mandrel, wherein the recess is composed of a vertical groove in the middle and oblique grooves connecting both sides, and a sliding pin is fixed through the outer wall of the reinforcing strip, wherein the sliding pin is inserted into and slidably installed in the recess.

[0012] Optionally, the material discharge channel includes two arc-shaped support plates that are rotatably installed on the bottom of both sides of the dry mixing pot, and the opposite sides of the two arc-shaped support plates are provided with stepped grooves that can overlap each other. The outer wall of the arc-shaped support plate is fixed with a fixing member, and a hydraulic cylinder is rotatably connected between the outer wall of the dry mixing pot and the fixing member.

[0013] Optionally, the inner walls of the two arc-shaped support plates together form the inner bottom of the dry mixing pot, and the length of the arc-shaped support plate is the same as the length of the bottom opening of the dry mixing pot.

[0014] Optionally, the wet mixing zone includes a wet mixing pot, which is equipped with two sets of relatively rotatable mixing components, and a water addition section and an asphalt addition section are respectively installed on the top of both sides of the wet mixing pot.

[0015] Optionally, it also includes two sets of drive units, and both sets of drive units drive the two sets of stirring shafts and the two sets of stirring components to rotate relative to each other via a transmission belt structure.

[0016] Optionally, the surfaces of both the first and second stirring blades are designed to be rough, and the texture direction is designed to be perpendicular to the material flow direction.

[0017] Optionally, along the rotation direction of the sleeve shaft, the ends of both the first and second stirring blades are provided with thickened tips.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] I. This invention achieves spatial separation of dry and wet by dividing the mixing device into vertically distributed dry mixing zone and wet mixing zone, eliminating the interference of wet residue on the next batch of dry mixing. At the same time, the parallel operation in time allows the dry mixing zone and wet mixing zone to overlap, improving equipment capacity and continuous production efficiency.

[0020] Second, this invention allows the first and second mixing blades to flexibly switch between mixing and conveying states. In the mixing state, a double-row shearing action is formed to subject the RAP aggregate to high-frequency impact friction and surface mechanical activation, thereby breaking down the old asphalt film and reducing cement adhesion differences. In the conveying state, a spiral conveying auger is formed in conjunction with transfer fan blades to achieve circumferential circulation of the mixture. This effectively eliminates the "mixing dead zone" in traditional mixing, achieving a microscopically uniform distribution of RAP aggregate, new material, and cement, avoiding the black and white material phenomenon, and further improving the qualification rate and mixing uniformity of recycled mixtures.

[0021] Third, this invention achieves rapid switching of the stirring blade state through the relative rotational cooperation of the mandrel and the sleeve shaft. Utilizing the principle of superposition or cancellation of the revolution and rotation of the transmission gears, the sleeve shaft speed is adjusted while keeping the mandrel speed constant, realizing instant switching and stable maintenance between the stirring state and the conveying state. At the same time, in conjunction with the sliding structure of the reinforcing strip and the groove, the connection strength at the hollow groove is automatically compensated during the state switching process, effectively improving the torsional bearing capacity and overall service life of the sleeve shaft. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the right-side stereoscopic structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the left-side stereoscopic structure of the present invention;

[0024] Figure 3 This is a top view of the present invention;

[0025] Figure 4 This is a right view of the present invention;

[0026] Figure 5 This is a schematic diagram of the switching component of the present invention;

[0027] Figure 6 This is a left sectional view of the present invention;

[0028] Figure 7 This is an exploded perspective view and a partially enlarged view of the stirring shaft of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the present invention when the stirring shaft switches to the conveying state.

[0030] In the picture:

[0031] 1. Dry mixing zone; 11. Dry mixing pot; 12. Mandrel; 13. Mounting parts; 14. First mixing blade; 15. Sleeve shaft; 16. Second mixing blade; 17. Transfer fan blade; 18. Hollowed-out groove;

[0032] 2. Wet mixing zone; 21. Wet mixing pot; 22. Mixing unit; 23. Water addition section; 24. Asphalt addition section;

[0033] 3. Material feeding channel; 31. Arc-shaped bearing plate; 32. Hydraulic cylinder; 33. Fixing components;

[0034] 4. Switching assembly; 41. First gear; 42. Second gear; 43. Rocker arm; 44. Transmission gear; 45. Connecting component; 46. Telescopic cylinder;

[0035] 5. Reinforcing components; 51. Slide groove; 52. Reinforcing strip; 53. Slot; 54. Sliding pin; 55. Insert groove; 551. Angled groove; 552. Vertical groove;

[0036] 6. Drive unit. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1, Figure 2 and Figure 8 This invention provides a technical solution: a plant-mixed cold recycled asphalt mixture mixing device, comprising a vertically distributed dry mixing zone 1 and a wet mixing zone 2, with the dry mixing zone 1 located above the wet mixing zone 2. The dry mixing zone 1 includes a dry mixing pot 11, and the bottom of the dry mixing pot 11 is provided with a material discharge channel 3 that can be opened or closed. Two sets of relatively rotatable mixing shafts are installed inside the dry mixing pot 11, and transfer fan blades 17 are fixed at the opposite ends of the two sets of mixing shafts. Multiple arc-shaped first mixing blades 14 and second mixing blades 16 are spaced apart on the outer wall of the mixing shafts, and the first mixing blades 14 and second mixing blades 16 can switch back and forth between two states: mixing state and conveying state. In the mixing state, the first mixing blades 14 and second mixing blades 16 are both located on one side of the mixing shaft; in the conveying state, the first mixing blades 14 and second mixing blades 16 are located on both sides of the mixing shaft and together form a spiral conveying auger. The two sets of spiral conveying augers and the two transfer fan blades 17 enable the mixture to be circulated and conveyed within the dry mixing pot 11.

[0039] This mixing device achieves spatial separation of dry and wet materials by dividing it into a dry mixing zone and a wet mixing zone, eliminating the interference of wet residue on the next batch of dry mixing. At the same time, the parallel operation in time allows the dry mixing zone and the wet mixing zone to overlap, increasing production capacity. Furthermore, by switching between mixing and conveying states during the dry mixing stage, it achieves the integration of mechanical activation of the RAP aggregate surface and uniform dry mixing. The specific dry mixing process is as follows:

[0040] The crushed and screened old and new materials are initially combined and collected by a conveyor belt (or other existing conveying equipment) and fed into the dry mixing pot 11 through the top opening. Cement is then conveyed into the dry mixing pot 11 via a screw conveyor or similar equipment, and the dry mixing process begins. An external drive structure drives two mixing shafts to rotate relative to each other, with the first mixing blade 14 and the second mixing blade 16 on the shafts rotating simultaneously. During mixing, both the first mixing blade 14 and the second mixing blade 16 are located on one side of the mixing shaft. Figure 1-3 As shown, the double-row shearing formed by the in-phase state of the two mixing blades not only enables high-frequency impact friction on the RAP aggregate but also roughens the surface of the RAP aggregate, destroying the old asphalt film on the surface of the RAP aggregate. The mechanical impact and friction activate the surface of the RAP aggregate, allowing cement to adhere better to the surface of the RAP aggregate, thereby reducing the difference in cement adhesion between the RAP aggregate and the virgin aggregate, further improving the mixing uniformity in the dry-mix state, and also providing a guarantee for the subsequent wet-mix stage. Preferably, in the mixing state, the first mixing blade 14 and the second mixing blade 16 on the two mixing shafts are designed in opposite directions, as shown... Figure 3 as well as Figure 6As shown, when the stirring blades on one stirring shaft rotate to the top, the stirring blades on the other stirring shaft rotate to the bottom, which makes the mixing more thorough.

[0041] Moreover, due to the arc-shaped design of the first stirring blade 14 and the second stirring blade 16, the aggregate has a slight pushing function during the mixing process, which can increase the mixing range and thus make the mixing more uniform.

[0042] Subsequently, the first stirring blade 14 and the second stirring blade 16 switch to the conveying state, that is, the first stirring blade 14 and the second stirring blade 16 are located on both sides of the stirring shaft, and together they form a spiral conveying auger, as shown. Figure 8 As shown, when the two stirring shafts continue to rotate relative to each other, the two sets of spiral conveyor augers will convey the material in opposite directions, causing the mixture in the dry mixing pot 11 to move in convection, such as... Figure 3 As shown, the design of the two sets of stirring shaft conveying end transfer fan blades 17, combined with the design of the mixing pot 11, enables the mixture to form a circumferential circulation, that is... Figure 3 The direction indicated by the arrow in the diagram ensures that the mixture in the dry mixing pot 11 is fully exchanged during the circulating flow, which also reduces stratification and segregation.

[0043] Subsequently, the first mixing blade 14 and the second mixing blade 16 switch back to mixing mode. By switching the mixing blades back and forth between mixing mode and conveying mode, the "mixing dead zone" existing in traditional mixing is eliminated, thereby achieving microscopic uniform distribution of RAP aggregate, new material and cement, avoiding the situation of black and white material in the final mixture, and further improving the qualification rate of recycled mixture.

[0044] After the dry mixing is completed, the material can be dropped into the wet mixing zone below by opening the material drop channel 3 under the dry mixing pot 11 to be mixed with water and emulsified asphalt for a second time, thus completing the mixing process of the recycled material.

[0045] The surfaces of the first mixing blade 14 and the second mixing blade 16 are both designed as rough surfaces, with the texture direction perpendicular to the material flow direction. The micro-cutting and ploughing effect generated by the friction between the rough surface and the RAP aggregate is utilized to tear the surface of the RAP aggregate by embedding the rough peaks into the old asphalt film on the surface of the RAP aggregate, thereby increasing the surface roughness of the RAP aggregate and realizing the surface activation of the RAP aggregate. This makes it easier for cement to adhere to the surface of the RAP aggregate, further improving the micro-mixing uniformity between materials.

[0046] Moreover, in the stirring state, the same-side design of the first stirring blade 14 and the second stirring blade 16 will cause the center of gravity of the overall stirring shaft to form an eccentric mass distribution, generating controllable eccentric vibration when rotating. This vibration works in conjunction with the stirring action to enhance the impact activation effect on the RAP aggregate.

[0047] It is worth noting that, in order to improve the service life and wear resistance of the stirring blades, the ends of the first stirring blade 14 and the second stirring blade 16 are both made into thickened tips, that is, the edge position is thickened. At the same time, making them into tips also makes it easier for them to rotate and be inserted into the mixture, reducing the resistance stress on the stirring blades during stirring and extending their service life.

[0048] The lower wet mixing zone 2 includes a wet mixing pot 21, which contains two sets of relatively rotatable mixing components 22. The top of the two sides of the wet mixing pot 21 is equipped with a water addition section 23 and an asphalt addition section 24, respectively.

[0049] The specific structure is as follows: Figure 2 and Figure 6 As shown, after the dry-mixed material falls into the wet mixing pot 21 below, water and emulsified asphalt are sprayed into the wet mixing pot 21 by the water addition unit 23 and the asphalt addition unit 24. Then, the final mixing is completed under the stirring action of the mixing unit 22.

[0050] The water addition section 23 and the asphalt addition section 24 can be connected to an external liquid supply device via connecting pipes. The mixing component 22 can be mixed using the existing mixing blade structure, or it can be mixed using the same structure as the above-mentioned mixing shaft, the first mixing blade 14 and the second mixing blade 16. That is, the mixing structure in the dry mixing pot 11 and the wet mixing pot 21 is the same, and the purpose of uniform mixing can be achieved.

[0051] To ensure that all the mixture in the dry mixing pot 11 falls into the wet mixing pot 21 below, the material discharge channel 3 has been further improved, specifically as follows: Figure 6 As shown, the material discharge channel 3 includes two arc-shaped support plates 31 that are rotatably installed on the bottom of both sides of the dry mixing pot 11. The opposite sides of the two arc-shaped support plates 31 are provided with stepped grooves that can overlap each other. The outer wall of the arc-shaped support plate 31 is fixed with a fastener 33. A hydraulic cylinder 32 is rotatably connected between the outer wall of the dry mixing pot 11 and the fastener 33.

[0052] The inner walls of the two arc-shaped support plates 31 together form the inner bottom of the dry mixing pot 11, and the length of the arc-shaped support plate 31 is the same as the length of the bottom opening of the dry mixing pot 11.

[0053] During the mixing stage, the hydraulic cylinder 32 keeps the arc-shaped support plate 31 in a closed state. Since the length of the arc-shaped support plate 31 is the same as the length of the bottom opening of the dry mixing pot 11, the two arc-shaped support plates 31 can jointly form the bottom of the mixing area. Furthermore, through the design of the stepped grooves on the opposite sides of the two arc-shaped support plates 31, a labyrinth seal structure is formed when closed. Combined with the rubber sealing strip, it can ensure that there is no material leakage or dust escape during the mixing process, and prevent material spillage.

[0054] Furthermore, the arc-shaped design of the arc-shaped bearing plate 31 enables the first stirring blade 14 and the second stirring blade 16 to cooperate with each other during stirring to guide the material to roll upward, thereby improving the uniformity of stirring. At the same time, when the two arc-shaped bearing plates 31 are opened during unloading, they can also form a central material dropping shape to avoid the material from spilling from the periphery and ensure the complete transfer of the material.

[0055] In order to enable the first stirring blade 14 and the second stirring blade 16 to switch between stirring mode and conveying mode, an installation and switching method is provided, the specific installation method being as follows: Figure 7 As shown, the stirring shaft includes a core shaft 12 and a sleeve shaft 15 that are rotatably inserted into each other. Both ends of the sleeve shaft 15 penetrate the outer walls of both sides of the mixing pot 11 and are rotatably connected to the penetration points of the outer walls of the mixing pot 11. Second stirring blades 16 are arranged and fixed on the outer wall of the sleeve shaft 15, and transfer fan blades 17 are also fixed on the outer wall of the sleeve shaft 15. Figure 3 As shown, the first stirring blade 14 is arranged and fixed on the outer wall of the mandrel 12 by the mounting member 13, and the outer wall of the sleeve shaft 15 is provided with a hollow groove 18 for the mounting member 13 to pass through and move.

[0056] First, the mounting component 13 protrudes through the hollowed-out groove 18 on the outer wall of the sleeve shaft 15. Simultaneously, the hollowed-out groove 18 also serves as an axial limit for the mandrel 12 via the mounting component 13. Then, the first stirring blade 14 is fixed to one end of the mounting component 13 protruding from the hollowed-out groove 18 by bolts or other means. The second stirring blade 16 can be fixed to the outer wall of the sleeve shaft 15 by welding or other means. Thus, by adjusting the relative rotation of the mandrel 12 and the sleeve shaft 15, the first stirring blade 14 and the second stirring blade 16 can be switched between stirring and conveying states. The specific switching method is as follows: Figure 4 As shown, the switching assembly 4 includes a first gear 41 fixed to the end of the spindle 12 and a second gear 42 fixed to the outer wall of the sleeve shaft 15. The first gear 41 and the second gear 42 have the same design. A rocker arm 43 is rotatably sleeved on the outer wall of the spindle 12. A transmission gear 44 is rotatably mounted on the outer wall of the rocker arm 43. The transmission gear 44 meshes with both the first gear 41 and the second gear 42. A connector 45 is rotatably connected to the end of the rocker arm 43 away from the spindle 12. A telescopic cylinder 46 is fixed to the outer wall of the dry mixing pot 11. The output end of the telescopic cylinder 46 is vertically designed and rotatably connected to the free end of the connector 45.

[0057] It also includes two sets of drive units 6, and both sets of drive units 6 drive the two sets of stirring shafts and the two sets of stirring components 22 to rotate relative to each other through a transmission belt structure.

[0058] During the stirring process, the drive unit 6 drives the transmission belt structure to rotate the spindle 12 and the stirring component 22, as shown in the specific structure. Figure 2As shown, it can also be designed that two sets of drive units 6 drive two sets of spindles 12 and two sets of stirring components 22 to rotate respectively, so that the two sets of spindles 12 and two sets of stirring components 22 can rotate relative to each other.

[0059] Meanwhile, since the first gears 41 at the ends of the two sets of spindles 12 mesh with each other, the two sets of spindles 12 can rotate synchronously relative to each other. At the same time, due to the design of the transmission gear 44, when the first gear 41 rotates, the second gear 42 will be driven to rotate together under the transmission action of the transmission gear 44. Since the diameter and number of teeth of the first gear 41 and the second gear 42 are the same, the first gear 41 and the second gear 42 can rotate synchronously, thereby enabling the spindle 12 and the sleeve shaft 15 to rotate synchronously, so that the first stirring blade 14 and the second stirring blade 16 can maintain the same position of the stirring shaft in the stirring state or maintain the state of the spiral conveying auger in the conveying state.

[0060] When a switch is required, see [link / reference]. Figure 4 The movement of the output end of the telescopic cylinder 46 causes the connecting piece 45 to move, thereby causing the rocker arm 43 to rotate. This, in turn, causes the transmission gear 44 to rotate around the axis of the first gear 41 while rotating on its own axis. Figure 5 As shown, the dashed arrows indicate the rotation direction of the first gear 41 and the transmission gear 44, while the solid arrows indicate the swing direction of the rocker arm 43.

[0061] Taking clockwise as an example, the first gear 41 rotates clockwise while the transmission gear 44 rotates counterclockwise. When the transmission gear 44 revolves around the first gear 41 in a clockwise direction, the revolution of the transmission gear 44 is opposite to its rotation, and the two partially cancel each other out, causing the speed of the transmission gear 44 to decrease. This, in turn, reduces the speed of the second gear 42. That is, the speed of the spindle 12 remains unchanged while the speed of the sleeve shaft 15 decreases, which in turn causes relative rotation between the spindle 12 and the sleeve shaft 15, switching the first stirring blade 14 and the second stirring blade 16 from stirring state to conveying state.

[0062] Conversely, when the transmission gear 44 revolves around the first gear 41 in a counterclockwise direction, the revolution and rotation of the transmission gear 44 are in the same direction, and the two are partially superimposed, which increases the speed of the transmission gear 44. That is, the speed of the spindle 12 remains unchanged while the speed of the sleeve shaft 15 increases, which in turn causes relative rotation between the spindle 12 and the sleeve shaft 15, causing the first stirring blade 14 and the second stirring blade 16 to switch from the conveying state to the stirring state, completing the back-and-forth switching between states.

[0063] In this way, the switching between conveying and stirring states can be achieved through the swinging process of the swing rod 43. After the swing rod 43 stops swinging, the first stirring blade 14 and the second stirring blade 16 can continue to be in the conveying or stirring state, thus achieving the effect of switching states at any time and maintaining the state after the switch.

[0064] It is worth noting that, during the switching process, preferably, the switching is performed when the stirring blade is detached from the material. That is, the second stirring blade 16 on the sleeve shaft 15 is switched when it is detached from the material. This can reduce the rotational stress of the second stirring blade 16 during the switching and improve the smoothness of the switching.

[0065] Since the second stirring blade 16 and the sleeve shaft 15 need to be rotated 180 degrees for adjustment during switching, and the hollow groove 18 is designed to allow the mounting part 13 to extend, the connecting part of the sleeve shaft 15 at the hollow groove 18 position will be relatively small, thus reducing the torsional force it can withstand. Therefore, in order to improve the overall torsional bearing capacity of the sleeve shaft 15, a reinforcing component 5 is designed at the hollow groove 18 to enhance the torsional bearing capacity of the sleeve shaft 15, specifically as follows: Figure 7 As shown, the reinforcing component 5 includes a groove 51 and a slot 53 formed on the outer wall of the sleeve shaft 15 near the hollow groove 18. The groove 51 and the slot 53 are designed to be parallel to the axis of the sleeve shaft 15. A reinforcing strip 52 is slidably installed on the inner wall of the groove 51. A groove 55 is formed on the outer wall of the spindle 12. The groove 55 is composed of a vertical groove 552 in the middle and inclined grooves 551 connected on both sides. A sliding pin 54 is fixed through the outer wall of the reinforcing strip 52. The sliding pin 54 is inserted into and slidably installed in the groove 55.

[0066] First, when the mandrel 12 and the sleeve shaft 15 rotate relative to each other, the sliding pin 54 will slide along the inclined groove 551, that is, the reinforcing strip 52 will first disengage from the slot 53 and retract into the sliding groove 51 until the sliding pin 54 slides to the connection between the inclined groove 551 and the vertical groove 552. At this time, the reinforcing strip 52 is completely retracted into the sliding groove 51 to avoid affecting the stroke of the mounting part 13. As the sliding pin 54 continues to slide in the vertical groove 552 until it slides into another inclined groove 551, the reinforcing strip 52 will extend into the hollow groove 18 again until it is inserted into the slot 53 again. In this way, by using the sliding fit between the groove 55 (similar to a V-groove) and the sliding pin 54, the mounting part 13 can pass through, and the reinforcing strip 52 can also compensate for the connection strength at the hollow groove 18 after the state switch, so as to enhance the torsional bearing capacity of the sleeve shaft 15 and improve its service life.

[0067] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixing device for plant-mixed cold recycled asphalt mixture, characterized in that, It includes a vertically distributed dry mixing zone (1) and a wet mixing zone (2), wherein the dry mixing zone (1) is located above the wet mixing zone (2), the dry mixing zone (1) includes a dry mixing pot (11), and the bottom of the dry mixing pot (11) is provided with a material discharge channel (3) that can be opened or closed, and further includes: Two sets of stirring shafts are installed inside the dry mixing pot (11) and can rotate relative to each other. Transfer fan blades (17) are fixed to the opposite ends of both sets of stirring shafts. Multiple arc-shaped first stirring blades (14) and second stirring blades (16) are spaced apart on the outer wall of the stirring shafts. The first stirring blades (14) and second stirring blades (16) can switch back and forth between stirring and conveying states. In the stirring state, both the first stirring blade (14) and the second stirring blade (16) are located on one side of the stirring shaft; In the conveying state, the first stirring blade (14) and the second stirring blade (16) are located on both sides of the stirring shaft and together form a spiral conveying auger. The two sets of spiral conveying augers and two transfer fan blades (17) make the mixture circulate and convey within the dry mixing pot (11).

2. The mixing device for cold recycled asphalt mixture in a plant as described in claim 1, characterized in that: The stirring shaft includes a core shaft (12) and a sleeve shaft (15) that are rotatably inserted into each other. The two ends of the sleeve shaft (15) pass through the outer walls of both sides of the dry mixing pot (11) and are rotatably connected to the through-holes of the outer walls of both sides of the dry mixing pot (11). The second stirring blade (16) is arranged and fixed on the outer wall of the sleeve shaft (15). The first stirring blade (14) is arranged and fixed on the outer wall of the core shaft (12) through the mounting piece (13). The outer wall of the sleeve shaft (15) is provided with a hollow groove (18) for the mounting piece (13) to pass through and move.

3. The mixing device for cold recycled asphalt mixture in a plant as described in claim 2, characterized in that: It also includes a switching component (4), which includes a first gear (41) fixed to the end of the spindle (12) and a second gear (42) fixed to the outer wall of the sleeve shaft (15). The first gear (41) and the second gear (42) have the same design. A rocker arm (43) is rotatably sleeved on the outer wall of the spindle (12). A transmission gear (44) is rotatably mounted on the outer wall of the rocker arm (43). The transmission gear (44) meshes with both the first gear (41) and the second gear (42). A connector (45) is rotatably connected to the end of the rocker arm (43) away from the spindle (12). A telescopic cylinder (46) is fixed to the outer wall of the dry mixing pot (11). The output end of the telescopic cylinder (46) is vertically designed and rotatably connected to the free end of the connector (45).

4. The mixing device for cold recycled asphalt mixture in a plant as described in claim 2, characterized in that: It also includes a reinforcing component (5), which includes a groove (51) and a slot (53) formed on the outer wall of the sleeve shaft (15) near the hollow groove (18). The groove (51) and the slot (53) are designed to be parallel to the axis of the sleeve shaft (15). A reinforcing strip (52) is slidably installed on the inner wall of the groove (51). A groove (55) is formed on the outer wall of the mandrel (12). The groove (55) is composed of a vertical groove (552) in the middle and a slanted groove (551) connected on both sides. A sliding pin (54) is fixed through the outer wall of the reinforcing strip (52). The sliding pin (54) is inserted into and slidably installed in the groove (55).

5. The mixing device for plant-mixed cold recycled asphalt mixture according to claim 1, characterized in that: The material discharge channel (3) includes two arc-shaped support plates (31) that are rotatably installed on the bottom of both sides of the dry mixing pot (11). The two arc-shaped support plates (31) are provided with stepped grooves that can overlap each other on opposite sides. The outer wall of the arc-shaped support plate (31) is fixed with a fastener (33). A hydraulic cylinder (32) is rotatably connected between the outer wall of the dry mixing pot (11) and the fastener (33).

6. The mixing device for cold recycled asphalt mixture in a plant as described in claim 5, characterized in that: The inner walls of the two arc-shaped support plates (31) together form the inner bottom of the dry mixing pot (11), and the length of the arc-shaped support plate (31) is the same as the length of the bottom opening of the dry mixing pot (11).

7. The mixing device for cold recycled asphalt mixture in a plant as described in claim 1, characterized in that: The wet mixing zone (2) includes a wet mixing pot (21), which is equipped with two sets of relatively rotating mixing components (22), and the top of the two sides of the wet mixing pot (21) are respectively equipped with a water addition part (23) and an asphalt addition part (24).

8. The mixing device for cold recycled asphalt mixture in a plant as described in claim 7, characterized in that: It also includes two sets of drive units (6), and both sets of drive units (6) drive the two sets of stirring shafts and the two sets of stirring components (22) to rotate relative to each other through a transmission belt structure.

9. The mixing device for plant-mixed cold recycled asphalt mixture according to any one of claims 1-8, characterized in that: The surfaces of the first stirring blade (14) and the second stirring blade (16) are both designed to be rough surfaces, and the texture direction is designed to be perpendicular to the material flow direction.

10. The mixing device for plant-mixed cold recycled asphalt mixture according to any one of claims 2-4, characterized in that: Along the rotation direction of the sleeve shaft (15), the ends of the first stirring blade (14) and the second stirring blade (16) are both provided with thickened tips.

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