An asphalt concrete precast block forming machine and a mixing method thereof

Abstract

The present application relates to the field of asphalt concrete precast block processing, discloses a kind of asphalt concrete precast block forming machine and its mixing method, including support frame, the right side upper end of the support frame is equipped with mounting bracket, the mounting bracket is equipped with mixer, the inside of the support frame is provided with conveying assembly, the conveying assembly can realize intermittent feeding, the upper end of the middle of the support frame is provided with bubble removal mechanism, mold is placed from the right side of conveying assembly, after being injected aggregate after mixer, it is conveyed to bubble removal mechanism after, it is turned out from the left side of conveying assembly;The conveying assembly includes conveying roller rotationally connected between the inner wall of the front and back of support frame, two conveying rollers are commonly provided with conveying belt around it.The forming machine can realize continuous forming during use, and the quality of precast block after forming can be guaranteed by using vibration, negative pressure and multiple ways of pressurization to remove bubbles during forming.

Description

Technical Field

[0001] This invention relates to the field of asphalt concrete precast block processing, and more particularly to an asphalt concrete precast block forming machine and its mixing method. Background Technology

[0002] In the field of infrastructure construction, precast asphalt concrete blocks are widely used in the paving of roads, squares, parking lots, and other projects. Their quality directly affects the overall performance and service life of the project. Traditional production methods for precast asphalt concrete blocks are difficult to carry out continuously, resulting in low overall efficiency.

[0003] In addition, air bubbles have always been a key factor affecting quality during the precast block molding process. The presence of air bubbles reduces the density of the precast blocks, causing a decrease in their compressive and flexural strength. During long-term use, the cavitation effect of air bubbles may also accelerate moisture penetration, leading to internal structural damage and ultimately affecting the durability of the precast blocks.

[0004] Currently, although some molding equipment on the market attempts to solve the bubble problem, most of them use vibration to remove bubbles. For some tiny bubbles or bubbles that adhere to the surface of aggregates, vibration is difficult to completely remove them. Moreover, the efficiency of simply removing bubbles by vibration is relatively poor and time-consuming. Therefore, how to solve the above problems needs to be considered. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an asphalt concrete precast block molding machine. This molding machine can achieve continuous molding during use. During molding, it uses multiple methods such as vibration, negative pressure, and pressurization to remove air bubbles, thus ensuring the quality of the precast blocks after molding.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A precast asphalt concrete block forming machine includes a support frame, an mounting frame mounted on the upper right side of the support frame, a mixer mounted on the mounting frame, a conveying assembly on the inner side of the support frame, the conveying assembly enabling intermittent feeding, and an air bubble removal mechanism located at the upper middle part of the support frame. After the mold is placed into the conveying assembly from the right side, aggregate is injected through the mixer, conveyed to the air bubble removal mechanism, and then exited from the left side of the conveying assembly. The conveying assembly includes conveying rollers rotatably connected between the inner walls of the front and rear sides of the support frame, with a conveyor belt wound around the two conveying rollers. Two vertical plates are symmetrically fixedly connected to the upper end of the support frame. An mounting plate is fixedly connected to the upper end of the front vertical plate, and a U-shaped frame is fixedly connected to the front side of the mounting plate. A drive motor is mounted on the front side of the U-shaped frame, and the output shaft of the drive motor passes through the U-shaped frame and is fixedly connected to an incomplete gear. The front end of the left conveying roller extends to the outside and is fixedly connected to a first driven gear, which meshes with the incomplete gear.

[0007] Preferably, a support plate is fixedly connected between the two vertical plates, the upper end of the support plate is in contact with the inner wall of the conveyor belt, and a plurality of support rollers are rotatably connected between the two vertical plates, all of which are in contact with the inner wall of the conveyor belt.

[0008] Preferably, the bubble removal mechanism includes a forming box symmetrically fixedly connected to the upper ends of two vertical plates. Through openings are provided on both the left and right side walls of the forming box. A vertically movable lifting plate is provided inside the forming box. A second fixing rod is fixedly connected to the lower end of the lifting plate. A pressure frame is provided through the lower end of the second fixing rod. A sealing port that cooperates with the second fixing rod is provided on the pressure frame. A hollow pressure plate is fixedly connected to the lower end of the second fixing rod. The upper end of the pressure frame is elastically connected to the lower end of the lifting plate via a first spring. A guide frame is fixedly connected to the upper end of the pressure frame. Multiple vertical parts of the guide frame penetrate the lifting plate and the inner top of the forming box, and are slidably connected.

[0009] Preferably, a horizontal plate is fixedly connected to the front side of both the molding box and the front vertical plate. A reciprocating screw is rotatably connected to the lower end of the upper horizontal plate. A matching slider is provided through the reciprocating screw. A strip-shaped opening is provided on the front side wall of the molding box. A connecting block is fixedly connected to the rear side of the slider. The rear side of the connecting block passes through the strip-shaped opening and is fixedly connected to the front side of the lifting plate.

[0010] Preferably, a first rotating shaft is rotatably connected to the front side of the mounting plate, and a second driven gear is fixedly connected to the first rotating shaft. The second driven gear engages with an incomplete gear. A second rotating shaft is rotatably connected to the front side of the vertical plate located at the front. Synchronous pulleys are fixedly connected to both the first and second rotating shafts, and a synchronous belt is installed on both synchronous pulleys.

[0011] Preferably, a gearbox is fixedly connected to the upper end of the lower horizontal plate, the output shaft of the gearbox is fixedly connected to the lower end of the reciprocating lead screw, the input end of the gearbox passes through the lower horizontal plate and is fixedly connected to a second bevel gear, a first bevel gear is fixedly connected to the second rotating shaft, and the first bevel gear meshes with the second bevel gear.

[0012] Preferably, an air-storing piston cylinder is fixedly connected to the upper end of the molding box, and a piston plate that can slide up and down is provided inside the air-storing piston cylinder. A first fixing rod is fixedly connected to the lower end of the piston plate. The lower end of the first fixing rod passes through the inner bottom of the air-storing piston cylinder and is fixedly connected to the upper end of the lifting plate. An airflow channel is provided on the piston plate, the first fixing rod, the lifting plate, and the second fixing rod. Multiple air holes are provided on the inner top of the hollow pressure plate.

[0013] Preferably, the system further includes a vibration mechanism comprising multiple connecting piston cylinders fixedly connected to the side wall of the pressure frame. Each connecting piston cylinder contains a slidable magnetic piston. The side of each magnetic piston closest to the pressure frame is elastically connected to the inner wall of the corresponding connecting piston cylinder via a second spring. Each connecting piston cylinder has a second communication port on the side closest to the pressure frame. The inner wall of the pressure frame has multiple first communication ports corresponding to the second communication ports. A magnetic block is fixedly connected to the side wall of each connecting piston cylinder away from the pressure frame. A rectangular guide groove is formed on the side wall of each connecting piston cylinder away from the pressure frame. A U-shaped rod is fixedly connected to the side of each magnetic piston away from the corresponding second spring. Each U-shaped rod passes through the corresponding rectangular guide groove, and an impact ball is fixedly connected to the other end of each U-shaped rod.

[0014] Preferably, each magnetic block is attracted to the corresponding magnetic piston by opposite polarities, and multiple annular grooves are equally spaced on the outer wall of the second fixing rod.

[0015] This invention also discloses a mixing method for an asphalt concrete precast block molding machine, which uses the aforementioned molding machine and includes the following steps: Step 1: Select aggregates, fillers, mineral powder and recycled asphalt that meet the specifications, dry the aggregates to a moisture content of <0.5%, heat the recycled asphalt to 150-185℃, and ensure the mineral powder has a moisture content of ≤1% to complete the pretreatment; Step 2: Weigh each pretreatment raw material using calibrated weighing equipment. The weighing error of asphalt should be ≤0.1%, and that of aggregate should be ≤0.3%. Step 3: Feed the hot aggregate and mineral powder into the mixer and dry mix for 5-10 seconds to make them evenly mixed and remove trace amounts of moisture from the surface of the aggregate, in preparation for asphalt coating. Step 4: After dry mixing, add preheated recycled asphalt at a uniform speed and start the mixer to mix for 35-45 seconds to ensure that the asphalt evenly coats the aggregate. Step 5: Set the mixer to heat preservation mode to ensure the fluidity of the mixed material after mixing, in preparation for subsequent feeding.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: 1. This invention involves precise mixing of recycled asphalt with other raw materials after standardized heating pretreatment. This not only enables the effective reuse of recycled asphalt, reducing dependence on virgin asphalt and minimizing resource extraction, but also promotes resource recycling, demonstrating energy efficiency and sustainable development.

[0017] 2. The conveying assembly uses a partially driven gear to engage with a driven gear, enabling the conveyor rollers to rotate intermittently, thus causing the conveyor belt to feed material intermittently. Simultaneously, the partially driven gear alternately meshes with different driven gears during rotation, achieving linkage between the conveying assembly and the air bubble removal mechanism. This design ensures accurate mold delivery to each workstation while maintaining a compact and orderly processing flow, reducing equipment complexity and floor space requirements.

[0018] 3. The lifting plate moves the pressure frame and hollow pressure plate downwards to form a closed space. The piston plate moves downwards, generating negative pressure to draw out air bubbles. The annular groove of the second fixing rod engages with the inner wall of the pressure frame, causing the sealing of the closed space to change intermittently, generating negative pressure pulses. This "kneading" of the air bubbles reduces their adhesion, promotes the migration of deep air bubbles, breaks down the surface crust, and efficiently removes various types of air bubbles, especially effective in removing air bubbles in high-viscosity systems, thus improving the quality of precast blocks.

[0019] 4. During negative pressure operation, the vibration mechanism works synchronously. When the negative pressure reaches the threshold, the magnetic piston drives the impact ball to strike the pressure frame, causing it to vibrate and transmit the vibration to the aggregate, dislodging internal air bubbles. The intermittent decrease in air pressure causes the magnetic piston to move back, and the vibration is repeated multiple times. This, combined with negative pressure and pressurization, achieves multi-mode air bubble removal, further improving the air bubble removal effect and ensuring the dense internal structure of the precast blocks. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an asphalt concrete precast block molding machine proposed in this invention; Figure 2 for Figure 1 A three-dimensional structural diagram of the removal of the mixing mechanism; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 for Figure 2 Enlarged view of point B; Figure 5 for Figure 2 A cross-sectional schematic diagram; Figure 6 for Figure 5 Enlarged view of point C; Figure 7 This is a diagram showing the connection between the second fixing rod and the hollow pressure plate. Figure 8 This is a connection diagram between one of the piston cylinders and the impact ball; Figure 9 for Figure 8 Cross-sectional view.

[0021] In the diagram: 1. Support frame, 2. Mixer, 3. Mounting frame, 4. Conveying assembly, 5. Vertical plate, 6. Forming box, 7. Air accumulator piston cylinder, 8. Guide frame, 9. Horizontal plate, 10. Slider, 11. Reciprocating screw, 12. Strip-shaped opening, 13. Mounting plate, 14. U-shaped frame, 15. Drive motor, 16. First driven gear, 17. Incomplete gear, 18. First rotating shaft, 19. Second driven gear, 20. Synchronous pulley, 21. Synchronous belt, 22. Gearbox, 23. Second rotating shaft, 24. First bevel gear, 25. 26 Second bevel gear, 27 Support roller, 28 Support plate, 29 Lifting plate, 20 First spring, 31 Piston plate, 32 First fixing rod, 33 Second fixing rod, 34 Pressure frame, 35 Sealing port, 36 Hollow pressure plate, 37 Air hole, 38 Annular groove, 39 Airflow channel, 40 Connecting piston cylinder, 41 U-shaped rod, 42 Impact ball, 43 Rectangular guide groove, 44 Magnetic block, 45 Magnetic piston, 46 Second spring, 47 Second connecting port. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0023] Reference Figures 1-9 A precast asphalt concrete block forming machine includes a support frame 1, which is welded from steel profiles to ensure the stability of the equipment during operation. An installation frame 3 is installed on the upper right side of the support frame 1, and a mixer 2 is installed on the installation frame 3. The discharge port of the mixer 2 is directly opposite the conveying path of the conveying component 4, and an electromagnetic control valve is provided at the discharge port to accurately control the amount of aggregate injected, avoiding aggregate waste or insufficient filling. The mixer 2 also integrates a heating module, a heat preservation module, and a mixing template, all of which are existing technologies and will not be described in detail here. The inner side of the support frame 1 is provided with a conveying component 4, which can realize intermittent feeding. An air bubble removal mechanism is provided at the upper middle part of the support frame 1. After the mold is put in from the right side of the conveying component 4, the aggregate is injected through the mixer 2 and then conveyed to the air bubble removal mechanism, and then turned out from the left side of the conveying component 4. The entire processing flow is continuous and highly automated. The conveying assembly 4 includes conveying rollers rotatably connected between the inner walls of the front and rear sides of the support frame 1. A conveyor belt is wound around the two conveying rollers. The conveyor belt is made of high-temperature resistant and wear-resistant rubber material, and the surface is provided with anti-slip protrusions to effectively prevent the mold from sliding during the conveying process. Two vertical plates 5 are symmetrically fixedly connected to the upper end of the support frame 1. An mounting plate 13 is fixedly connected to the upper end of the vertical plate 5 on the front side. A U-shaped frame 14 is fixedly connected to the front side of the mounting plate 13. A drive motor 15 is installed on the front side of the U-shaped frame 14. The drive motor 15 is a servo motor, which can precisely control the speed. The output shaft of the drive motor 15 passes through the U-shaped frame 14 and is fixedly connected to an incomplete gear 17. The front end of the conveying roller on the left side extends to the outside and is fixedly connected to a first driven gear 16. The first driven gear 16 cooperates with the incomplete gear 17. By rotating the incomplete gear 17, the first driven gear 16 can be driven to rotate intermittently, thereby realizing the intermittent feeding of the conveyor belt. The interval time can be flexibly adjusted by adjusting the speed of the drive motor 15.

[0024] The bubble removal mechanism includes a molding box 6 symmetrically fixedly connected to the upper ends of two vertical plates 5. Through openings are provided on both the left and right side walls of the molding box 6, the size of which matches the mold size for easy mold entry and exit. Inside the molding box 6 is a vertically movable lifting plate 28. A second fixing rod 32 is fixedly connected to the lower end of the lifting plate 28. A pressure frame 33 is provided through the lower end of the second fixing rod 32 (the pressure frame 33 has a sealing port 34 that mates with the second fixing rod 32, and a sliding sealing ring is provided at the through point to ensure sliding sealing). The lower end face of the pressure frame 33 matches the mold opening, and a flexible sealing gasket is provided on the lower end face to ensure sealing during pressurization and prevent damage to the mold. A hollow pressure plate 35 is fixedly connected to the lower end of the second fixing rod 32. The upper end of the pressure frame 33 is elastically connected to the lower end of the lifting plate 28 via a first spring 29. A guide frame 8 is fixedly connected to the upper end of the pressure frame 33, ensuring... To ensure the stability of the pressure frame 33 and the lifting plate 28 during vertical movement and prevent deviation, multiple vertical parts of the guide frame 8 penetrate the lifting plate 28 and the inner top of the forming box 6 and are slidably connected. The front sides of the forming box 6 and the front vertical plate 5 are fixedly connected to a horizontal plate 9. The lower end of the upper horizontal plate 9 is rotatably connected to a reciprocating screw 11. A matching slider 10 is provided through the reciprocating screw 11. By rotating the reciprocating screw 11, the slider 10 is driven to move up and down, which in turn drives the lifting plate 28 to move up and down through the connecting block to achieve the pressure action. The cooperation method between the reciprocating screw 11 and the slider 10 is the existing technology, that is, the outer side of the reciprocating screw 11 is provided with a reciprocating thread groove, and the inner wall of the slider 10 is fixedly connected to a guide pin that can slide in the reciprocating thread groove. A strip-shaped opening 12 is opened on the front side wall of the forming box 6, and a connecting block is fixedly connected to the rear side of the slider 10. The rear side of the connecting block penetrates the strip-shaped opening 12 and is fixedly connected to the front side of the lifting plate 28. Furthermore, a first rotating shaft 18 is rotatably connected to the front side of the mounting plate 13. A second driven gear 19 is fixedly connected to the first rotating shaft 18. The second driven gear 19 engages with an incomplete gear 17. When the incomplete gear 17 rotates, it alternately meshes with the first driven gear 16 and the second driven gear 19, realizing the linkage between the conveying assembly 4 and the bubble removal mechanism without the need for additional drive equipment. A second rotating shaft 23 is rotatably connected to the front side of the vertical plate 5 located at the front. Synchronous pulleys 20 are fixedly connected to both the first rotating shaft 18 and the second rotating shaft 23. Both synchronous pulleys 20 are mounted with a common mechanism. The synchronous belt 21 is fixedly connected to the upper end of the lower horizontal plate 9. The gearbox 22 is a planetary gear gearbox, which can realize the speed adjustment. The output shaft of the gearbox 22 is fixedly connected to the lower end of the reciprocating screw 11 through a coupling. The input end of the gearbox 22 passes through the lower horizontal plate 9 and is fixedly connected to the second bevel gear 25. The first bevel gear 24 is fixedly connected to the second rotating shaft 23. The first bevel gear 24 meshes with the second bevel gear 25. Through the cooperation of the bevel gears, the horizontal rotation is converted into the vertical rotation, which drives the reciprocating screw 11 to rotate. Furthermore, an air-accumulating piston cylinder 7 is fixedly connected to the upper end of the molding box 6. The air-accumulating piston cylinder 7 is made of seamless steel pipe and has good sealing performance. Inside the air-accumulating piston cylinder 7, there is a piston plate 30 that can slide up and down. The piston plate 30 is tightly fitted to the inner wall of the air-accumulating piston cylinder 7 to ensure airtightness. The lower end of the piston plate 30 is fixedly connected to a first fixing rod 31. The lower end of the first fixing rod 31 passes through the inner bottom of the air-accumulating piston cylinder 7 and is fixedly connected to the upper end of the lifting plate 28. The piston plate 30, the first fixing rod 31, the lifting plate 28 and the second fixing rod 32 are all provided with airflow channels 39. The inner top of the hollow pressure plate 35 is provided with multiple air holes 36. The air holes 36 are evenly distributed to ensure that the negative pressure can be evenly applied to the aggregate in the mold. The core purpose of the air-accumulating piston cylinder 7 is to create a closed space when the pressure frame 33 contacts the filled mold. As the lifting plate 28 continues to move downward, the piston plate 30 moves upward within the air-accumulating piston cylinder 7, generating negative pressure within the closed space and drawing out air bubbles from the aggregate. Simultaneously, multiple annular grooves 38 are evenly spaced on the outer wall of the second fixing rod 32. These grooves cooperate with the inner wall of the pressure frame 33, allowing the sealing of the closed space to change intermittently. This causes the negative pressure to disappear and reappear, forming negative pressure pulses. With each pulse, the bubbles first expand rapidly under negative pressure and then contract when the pressure is released, repeatedly "rubbing" them and significantly reducing the adhesion between the bubbles and the slurry. The micro-flow field and shear force generated by the pressure fluctuations drive deep, micro-bubbles to migrate to the surface, overcoming the limitations of static buoyancy. The pulsating impact breaks up the crust on the slurry surface, keeping the exhaust channels unobstructed. It can efficiently remove bubbles in deep, small, closed, and high-viscosity systems, significantly improving the degassing rate and preventing bubbles from being adsorbed inside the aggregate due to continuous negative pressure and unable to be discharged. Furthermore, it also includes a vibration mechanism, which includes multiple connecting piston cylinders 40 fixedly connected to the side wall of the pressure frame 33. Each connecting piston cylinder 40 is provided with a slidable magnetic piston 45. The side of each magnetic piston 45 near the pressure frame 33 is elastically connected to the inner wall of the corresponding connecting piston cylinder 40 through a second spring 46. Each connecting piston cylinder 40 near the pressure frame 33 has a second communication port 47. The inner wall of the pressure frame 33 has multiple first communication ports 37 corresponding to the second communication ports 47. A magnetic block 44 is fixedly connected to the side wall of each connecting piston cylinder 40 away from the pressure frame 33. A rectangular guide groove 43 is provided on the side wall of each connecting piston cylinder 40 away from the pressure frame 33. A U-shaped rod 41 is fixedly connected to the side of each magnetic piston 45 away from the corresponding second spring 46. Each U-shaped rod 41 passes through the corresponding rectangular guide groove 43. The other end of each U-shaped rod 41... Each magnetic block 44 is fixedly connected to an impact ball 42, and each magnetic block 44 is connected to a corresponding magnetic piston 45 with opposite polarities attracting each other. When a negative pressure is generated inside the pressure frame 33, the magnetic piston 45 tends to overcome the attraction of the magnetic block 44 and the tension of the second spring 46 under the action of negative pressure. When the negative pressure reaches the threshold (the magnetic field strength decreases sharply with the cubic inverse proportionality of distance, and the magnetic circuit is closed when in contact and open when not in contact, causing the attraction to drop sharply at the moment of "separation", and the attraction will change suddenly after separation), the magnetic block 44 will suddenly move to the right and move towards the pressure frame 33, driving the U-shaped rod 41 and the impact ball 42 to move and impact, causing the pressure frame 33 to vibrate, which is then transmitted to the aggregate in the mold, shaking out the air bubbles inside the aggregate. With the combination of negative pressure and pressure, multiple ways of air bubble removal are achieved. Since the internal air pressure decreases intermittently and there is a return, this vibration process is performed multiple times, and the vibration defoaming effect is better.

[0025] A support plate 27 is fixedly connected between the two vertical plates 5. The upper end of the support plate 27 contacts the inner wall of the conveyor belt to support the upper surface of the conveyor belt and prevent the conveyor belt from sinking due to the weight of the mold and aggregate, thus ensuring the stability of the mold conveying. Multiple support rollers 26 are rotatably connected between the two vertical plates 5. The multiple support rollers 26 are evenly distributed and all contact the inner wall of the conveyor belt to further assist in supporting the conveyor belt.

[0026] In this invention, when the asphalt concrete precast block forming machine is working, the mixer 2 starts to work. The heating module, heat preservation module and stirring module integrated inside it heat, preserve and stir the asphalt aggregate. After the mixing is completed, the electromagnetic control valve at the discharge port of the mixer 2 opens and accurately injects the aggregate into the mold placed on the conveyor belt of the conveying component 4. When the conveying assembly 4 starts working, the drive motor 15 starts. The output shaft of the drive motor 15 passes through the U-shaped frame 14 and drives the incomplete gear 17 to rotate. The incomplete gear 17 cooperates with the first driven gear 16 fixedly connected to the front end of the left conveying roller, driving the first driven gear 16 to rotate intermittently, which in turn drives the conveying roller to rotate intermittently, so that the conveyor belt wrapped around the two conveying rollers can achieve intermittent feeding. The mold is put in from the right side of the conveying assembly 4. After the aggregate is injected below the mixer 2, it is intermittently conveyed to the bubble removal mechanism by the conveyor belt. The forming box 6 of the bubble removal mechanism is symmetrically fixedly connected to the upper end of the two vertical plates 5. The left and right side walls of the forming box 6 are provided with through holes. The size of the through holes is adapted to the size of the mold. The mold enters the interior of the forming box 6 through the through holes.

[0027] While the conveying component 4 is working, the incomplete gear 17 alternately meshes with the first driven gear 16 and the second driven gear 19 during rotation, realizing the linkage between the conveying component 4 and the bubble removal mechanism, and realizing the rotation of the reciprocating screw 11. When the reciprocating screw 11 rotates, it drives the slider 10 to move down first and then up, thereby driving the lifting plate 28 to move up and down.

[0028] When the lifting plate 28 moves downward, it drives the pressure frame 33 and the hollow pressure plate 35 downward until the pressure frame 33 contacts the mold to form a closed space. At this time, the lifting plate 28 continues to move downward, and the piston plate 30 connected to its upper end through the first fixing rod 31 moves downward in the air storage piston cylinder 7. The piston plate 30, the first fixing rod 31, the lifting plate 28 and the second fixing rod 32 are all provided with airflow channels 39. The top of the hollow pressure plate 35 is provided with multiple evenly distributed air holes 36. The downward movement of the piston plate 30 creates negative pressure in the closed space, and the air bubbles inside the aggregate are sucked out through the airflow channels 39 and the air holes 36. Meanwhile, multiple annular grooves 38 equally spaced on the outer wall of the second fixing rod 32 cooperate with the inner wall of the pressure frame 33, causing the sealing of the enclosed space to change intermittently, thereby generating negative pressure pulses. During each pulse, the bubbles first expand rapidly under negative pressure and then contract when the pressure is released, repeatedly "rubbing" to reduce the adhesion between the bubbles and the slurry. The micro-flow field and shear force generated by the pressure fluctuations drive deep and tiny bubbles to migrate to the surface. The pulsating impact destroys the crust on the surface of the slurry, keeps the exhaust channel unobstructed, and efficiently removes bubbles in deep, tiny, enclosed, high-viscosity systems.

[0029] During the negative pressure process, the vibration mechanism works synchronously. When the negative pressure reaches the threshold, the magnetic piston 45 overcomes the attraction of the magnetic block 44 and the tension of the second spring 46, and suddenly moves towards the pressure frame 33. The U-shaped rod 41 fixedly connected to the side of the magnetic piston 45 away from the second spring 46 passes through the rectangular guide groove 43 opened on the side wall of the piston cylinder 40, driving the impact ball 42 fixedly connected to the other end of the U-shaped rod 41 to strike the pressure frame 33, causing the pressure frame 33 to vibrate. The vibration is transmitted to the aggregate in the mold, shaking out the air bubbles inside the aggregate. This, combined with negative pressure and pressurization, achieves multi-mode bubble removal. Due to the intermittent decrease in air pressure in the enclosed space, the magnetic piston 45 will move back, causing the vibration process to be repeated multiple times, improving the vibration defoaming effect. Finally, as it moves down to the limit, the hollow pressure plate 35 contacts the upper surface of the asphalt aggregate, completing the pressurization and shaping operation, and further removing air bubbles.

[0030] After the air bubbles are removed, the lifting plate 28 moves upward under the drive of the reciprocating screw 11 and the slider 10, which drives the pressure frame 33, hollow pressure plate 35 and other components to reset. Then the conveying component 4 continues to feed intermittently, and sends the mold with the air bubbles removed out from the left through-hole of the forming box 6. The mold is rotated out from the left side of the conveying component 4, completing the forming process of a single asphalt concrete precast block. The entire processing flow is continuous and highly automated.

[0031] This invention also discloses a mixing method for an asphalt concrete precast block molding machine, which uses the aforementioned molding machine and includes the following steps: Step 1: Select aggregates, fillers, mineral powder and recycled asphalt that meet the specifications, dry the aggregates to a moisture content of <0.5%, heat the recycled asphalt to 150-185℃, and ensure the mineral powder has a moisture content of ≤1% to complete the pretreatment; Step 2: Weigh each pretreatment raw material using calibrated weighing equipment. The weighing error of asphalt should be ≤0.1%, and that of aggregate should be ≤0.3%. Step 3: Feed the hot aggregate and mineral powder into mixer 2 and dry mix for 5-10 seconds to make them evenly mixed, remove trace amounts of moisture from the surface of the aggregate, and prepare for asphalt coating. Step 4: After dry mixing, add preheated recycled asphalt at a uniform speed, and start mixer 2 to mix for 35-45 seconds to ensure that the asphalt evenly coats the aggregate. Step 5: Set mixer 2 to heat preservation mode to ensure the fluidity of the mixed material after mixing, in preparation for subsequent feeding.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A precast asphalt concrete block forming machine, characterized in that, include: A support frame (1) is provided with an mounting frame (3) on the upper right side of the support frame (1). A mixer (2) is installed on the mounting frame (3). A conveying assembly (4) is provided on the inner side of the support frame (1). The conveying assembly (4) can realize intermittent feeding. A bubble removal mechanism is provided at the upper middle part of the support frame (1). After the mold is put into the right side of the conveying assembly (4), it is injected with aggregate by the mixer (2), and then conveyed to the bubble removal mechanism and turned out from the left side of the conveying assembly (4). The conveying assembly (4) includes conveying rollers rotatably connected between the inner walls of the front and rear sides of the support frame (1). A conveyor belt is wound around the two conveying rollers. Two vertical plates (5) are symmetrically fixedly connected to the upper end of the support frame (1). An mounting plate (13) is fixedly connected to the upper end of the vertical plate (5) located on the front side. A U-shaped frame (14) is fixedly connected to the front side of the mounting plate (13). A drive motor (15) is installed on the front side of the U-shaped frame (14). The output shaft of the drive motor (15) passes through the U-shaped frame (14) and is fixedly connected to an incomplete gear (17). The front end of the conveying roller located on the left side extends to the outside and is fixedly connected to a first driven gear (16). The first driven gear (16) cooperates with the incomplete gear (17).

2. The asphalt concrete precast block forming machine according to claim 1, characterized in that, A support plate (27) is fixedly connected between the two vertical plates (5). The upper end of the support plate (27) is in contact with the inner wall of the conveyor belt. A plurality of support rollers (26) are rotatably connected between the two vertical plates (5). All of the support rollers (26) are in contact with the inner wall of the conveyor belt.

3. The asphalt concrete precast block forming machine according to claim 1, characterized in that, The bubble removal mechanism includes a molding box (6) symmetrically fixedly connected to the upper ends of two vertical plates (5). The molding box (6) has through openings on both the left and right side walls. The molding box (6) is equipped with a lifting plate (28) that can move up and down. The lower end of the lifting plate (28) is fixedly connected to a second fixing rod (32). The lower end of the second fixing rod (32) is provided with a pressure frame (33). The pressure frame (33) is provided with a sealing port (34) that cooperates with the second fixing rod (32). The lower end of the second fixing rod (32) is fixedly connected to a hollow pressure plate (35). The upper end of the pressure frame (33) is elastically connected to the lower end of the lifting plate (28) through a first spring (29). The upper end of the pressure frame (33) is fixedly connected to a guide frame (8). Multiple vertical parts of the guide frame (8) pass through the lifting plate (28) and the inner top of the molding box (6) and are slidably connected.

4. The asphalt concrete precast block forming machine according to claim 3, characterized in that, The molding box (6) and the front vertical plate (5) are both fixedly connected to the front side of the horizontal plate (9). The lower end of the upper horizontal plate (9) is rotatably connected to the reciprocating screw (11). A matching slider (10) is provided through the reciprocating screw (11). A strip-shaped opening (12) is opened on the front side wall of the molding box (6). A connecting block is fixedly connected to the rear side of the slider (10). The rear side of the connecting block passes through the strip-shaped opening (12) and is fixedly connected to the front side of the lifting plate (28).

5. The asphalt concrete precast block forming machine according to claim 4, characterized in that, The front side of the mounting plate (13) is rotatably connected to a first rotating shaft (18), and a second driven gear (19) is fixedly connected to the first rotating shaft (18). The second driven gear (19) cooperates with the incomplete gear (17). The front side of the vertical plate (5) located at the front is rotatably connected to a second rotating shaft (23). Both the first rotating shaft (18) and the second rotating shaft (23) are fixedly connected to synchronous pulleys (20), and a synchronous belt (21) is installed on both synchronous pulleys (20).

6. The asphalt concrete precast block forming machine according to claim 5, characterized in that, A gearbox (22) is fixedly connected to the upper end of the lower horizontal plate (9). The output shaft of the gearbox (22) is fixedly connected to the lower end of the reciprocating lead screw (11). The input end of the gearbox (22) passes through the lower horizontal plate (9) and is fixedly connected to a second bevel gear (25). A first bevel gear (24) is fixedly connected to the second rotating shaft (23). The first bevel gear (24) meshes with the second bevel gear (25).

7. The asphalt concrete precast block forming machine according to claim 6, characterized in that, The upper end of the molding box (6) is fixedly connected to an air-storing piston cylinder (7). The air-storing piston cylinder (7) is provided with a piston plate (30) that can slide up and down. The lower end of the piston plate (30) is fixedly connected to a first fixing rod (31). The lower end of the first fixing rod (31) passes through the inner bottom of the air-storing piston cylinder (7) and is fixedly connected to the upper end of the lifting plate (28). The piston plate (30), the first fixing rod (31), the lifting plate (28), and the second fixing rod (32) are all provided with airflow channels (39). The inner top of the hollow pressure plate (35) is provided with multiple air holes (36).

8. The asphalt concrete precast block forming machine according to claim 7, characterized in that, It also includes a vibration mechanism, which includes multiple connecting piston cylinders (40) fixedly connected to the side wall of the pressure frame (33). Each connecting piston cylinder (40) is provided with a slidable magnetic piston (45). The side of each magnetic piston (45) near the pressure frame (33) is elastically connected to the inner wall of the corresponding connecting piston cylinder (40) by a second spring (46). Each connecting piston cylinder (40) near the pressure frame (33) has a second communication port (47). The inner wall of the pressure frame (33) has multiple communication ports (47) with the second communication port (48). 47) Corresponding to the first connecting port (37), each of the connecting piston cylinders (40) has a magnetic block (44) fixedly connected to the side wall away from the pressure frame (33), each of the connecting piston cylinders (40) has a rectangular guide groove (43) opened on the side wall away from the pressure frame (33), each of the magnetic pistons (45) has a U-shaped rod (41) fixedly connected to the side away from the corresponding second spring (46), each of the U-shaped rods (41) passes through the corresponding rectangular guide groove (43), and the other end of each of the U-shaped rods (41) is fixedly connected to an impact ball (42).

9. The asphalt concrete precast block forming machine according to claim 8, characterized in that, Each of the magnetic blocks (44) is attracted to the corresponding magnetic piston (45) by opposite polarities, and multiple annular grooves (38) are equally spaced on the outer side wall of the second fixing rod (32).

10. A mixing method for an asphalt concrete precast block molding machine, characterized in that, The molding machine described in any one of claims 1-9 comprises the following steps: Step 1: Select aggregates, fillers, mineral powder and recycled asphalt that meet the specifications, dry the aggregates to a moisture content of <0.5%, heat the recycled asphalt to 150-185℃, and ensure the mineral powder has a moisture content of ≤1% to complete the pretreatment; Step 2: Weigh each pretreatment raw material using calibrated weighing equipment. The weighing error of asphalt should be ≤0.1%, and that of aggregate should be ≤0.3%. Step 3: Feed the hot aggregate and mineral powder into the mixer (2) and dry mix for 5-10 seconds to make the two evenly mixed, eliminate the trace moisture on the surface of the aggregate, and prepare for asphalt coating. Step 4: After dry mixing, add preheated recycled asphalt at a uniform speed and start the mixer (2) to mix for 35-45 seconds so that the asphalt evenly coats the aggregate; Step 5: Set the mixer (2) to the heat preservation state to ensure the fluidity of the mixture after mixing, in preparation for subsequent feeding.

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