A preparation system and method for asphalt concrete

Abstract

This invention relates to an asphalt concrete preparation system and method, comprising: a support plate, a mixing tank disposed above the support plate, and a mixing assembly disposed inside the mixing tank; a feeding mechanism disposed above the mixing tank, the feeding mechanism being used to add aggregate and asphalt into the mixing tank respectively; and a driving mechanism disposed on the support plate, the driving mechanism being used to control the amount of aggregate added and to drive the mixing assembly to move. This invention can ensure accurate automatic control of the asphalt concrete raw material ratio and can perform multiple batches of automatic production without the need for manual multiple transport and feeding. Therefore, it simultaneously possesses the functions of automatic feeding, automatic mixing, and automatic control of component ratios, enabling the preparation of asphalt concrete to be completed with a single device, reducing equipment costs.

Description

Technical Field

[0001] This invention relates to the field of asphalt concrete technology, and in particular to an asphalt concrete preparation system and preparation method. Background Technology

[0002] Asphalt concrete, commonly known as asphalt concrete, is a mixture made by artificially selecting mineral aggregates with a specific gradation, such as crushed stone or crushed gravel, stone chips or sand, and mineral powder, and mixing them with a certain proportion of road asphalt materials under strictly controlled conditions. With the continuous development of the domestic infrastructure industry, the use of asphalt concrete is increasing, leading to increasingly higher quality requirements for asphalt concrete. However, the following problems still exist in the preparation process of asphalt concrete:

[0003] 1. Currently, when asphalt concrete is needed, the demand for asphalt concrete is generally large, which makes it impossible for the mixer to mix all the raw materials at one time. Therefore, it needs to be prepared in multiple batches. In addition, during the preparation process, the proportion of raw materials needs to be manually adjusted and stirred multiple times after the raw materials are added. This makes it difficult to control the mixing ratio of the added raw materials, which can easily lead to an uncoordinated proportion of the components in the produced asphalt concrete, thus affecting the quality of the produced asphalt concrete.

[0004] 2. Existing asphalt concrete mixing equipment requires manual addition of raw materials during operation, which affects work efficiency;

[0005] 3. Existing asphalt concrete mixing equipment requires separate equipment for feeding and mixing, which cannot be controlled simultaneously by a single device, thus increasing equipment costs. Summary of the Invention

[0006] Therefore, it is necessary to provide an asphalt concrete preparation system and method that can automatically and accurately control the proportion of asphalt concrete raw materials, thereby improving work efficiency and reducing costs.

[0007] This invention discloses an asphalt concrete preparation system, comprising: a support plate, a mixing tank disposed above the support plate, and a mixing assembly disposed inside the mixing tank; a feeding mechanism disposed above the mixing tank, the feeding mechanism being used to add aggregate and asphalt into the mixing tank respectively; and a driving mechanism disposed on the support plate, the driving mechanism being used to control the amount of aggregate added and to drive the mixing assembly to move.

[0008] In one embodiment, the feeding mechanism includes: a first bracket, fixedly connected to one side of the support plate, the upper end of the first bracket being fixedly installed with a feed inlet for adding asphalt into the mixing tank and an infrared sensor for detecting the asphalt depth at the bottom of the mixing tank; and a second bracket, fixedly connected to the other side of the support plate, the upper end of the second bracket being fixedly installed with a feed trough for adding aggregate into the mixing tank.

[0009] In one embodiment, the driving mechanism includes: a feed shaft rotatably connected to the feed trough, a spiral blade fixedly connected to the feed shaft, one end of the feed shaft extending out of the feed trough and rotatably connected to a first driven pulley, an adjustment component for controlling the unidirectional rotation of the feed shaft being provided between the first driven pulley and the feed trough, and the first driven pulley being connected to a first driving pulley rotatably connected to a second bracket via a first transmission belt; a connecting shaft rotatably connected to the mixing tank, a second driven pulley fixedly connected to the outer end of the connecting shaft, the second driven pulley being connected to a second driving pulley via a second transmission belt, and the second driving pulley being rotatably connected to a third bracket fixedly connected to the support plate; and a motor fixedly connected to the second bracket, the output end of the motor being connected to a switching component for driving the first driving pulley or the second driving pulley to rotate.

[0010] In one embodiment, the adjustment assembly includes: a ratchet, fixedly connected to the end face of the first driven pulley and rotatably connected to the feed shaft; and a transmission disc, fixedly connected to the feed shaft, the end face of which is provided with a pawl that cooperates with the ratchet.

[0011] In one embodiment, the switching assembly includes: a first gear, coaxially fixedly connected to the end face of the first drive pulley, and rotatably connected to the second bracket; a second gear, coaxially fixedly connected to the end face of the second drive pulley, and rotatably connected to the third bracket; a transmission member, disposed above the support plate, the transmission member having a slat, an upper rack for meshing with the first gear, and a lower rack for meshing with the second gear, one end of the transmission member being rotatably connected to a rocker arm fixedly connected to the motor output end, and the other end of the transmission member being fitted with a tension spring between the transmission member and the second bracket for pulling the transmission member upward to make the upper rack mesh with the first gear; and an adjusting plate, disposed above the support plate, the upper end of the adjusting plate being fitted with a roller for rolling cooperation with the slat, and by moving the adjusting plate downward, the roller can be driven to contact the slat and press down the transmission member to make the lower rack mesh with the second gear.

[0012] In one embodiment, a plurality of legs are fixedly connected to the lower end of the mixing tank, and a sleeve fixedly connected to the support plate is slidably connected to the support leg. A first spring for pushing the support leg to move upward is installed between the support leg and the sleeve, and one of the support legs is fixedly connected to the adjusting plate.

[0013] In one embodiment, a fixing plate is fixedly connected to the outer side of the mixing tank, a fixing shaft is fixedly connected to the lower part of the fixing plate, a tensioning wheel placed in the second transmission belt is slidably connected to the fixing shaft, and a second spring sleeved on the fixing shaft is provided between the fixing plate and the tensioning wheel.

[0014] In one embodiment, a discharge gate is provided at the lower end of the mixing tank, an electric rod is rotatably connected between the discharge gate and the mixing tank, and a receiving trough is provided on the support plate below the discharge gate.

[0015] In one embodiment, the stirring assembly includes a stirring shaft rotatably connected to the stirring tank, stirring blades fixedly connected to the stirring shaft, and one end of the stirring shaft fixedly connected to a coupling.

[0016] A method for preparing asphalt concrete, using the asphalt concrete preparation system described above, includes: S1, preparation: First, add the aggregate from the asphalt concrete raw materials to be mixed into the feed trough, and simultaneously connect the asphalt feed pipe to the feed port flange. After the raw materials are prepared, activate the infrared sensor to complete the preparation; S2, feeding: Add asphalt into the mixing tank through the feed port until the asphalt at the bottom of the mixing tank reaches the set depth, then close the feed port. At this time, under the action of the tension spring, the upper rack meshes with the first gear, the motor is started, and the rocker arm drives the transmission component to move back and forth, thereby driving the first gear and the first driving pulley to rotate back and forth, thus driving the first driven pulley to rotate back and forth. Due to the cooperation of the pawl and the ratchet, the reciprocating rotation of the first driven pulley is converted into the unidirectional rotation of the transmission disc, that is, driving the spiral blade to rotate to feed the aggregate, so that the weight of the mixing tank gradually increases and moves downward, driving the roller to press down the transmission component to disengage the upper rack from the first gear, while controlling the aggregate in the mixing process. S3. Feeding: After feeding, the rollers drive the lower rack and the second gear to mesh. As the motor continues to rotate, the second gear and the second drive pulley rotate back and forth. The tension wheel maintains the tension of the second transmission belt, thus driving the second driven pulley to rotate back and forth, causing the mixing shaft and mixing blades to rotate back and forth, completing the mixing. S4. Discharging: After mixing, the motor automatically stops and the infrared sensor is turned off. The discharge gate is opened using the electric pole, and the mixed asphalt concrete is discharged from the bottom of the mixing drum into the receiving trough, completing the unloading. S5. Resetting: After unloading, the electric pole is started and the discharge gate is closed. At the same time, due to the emptying of the asphalt concrete inside the mixing drum, the mixing drum is driven to rise under the action of the first spring, which causes the rollers to stop pressing down on the strips. Therefore, under the action of the tension spring, the upper gear meshes with the first gear, completing the resetting. S6. Cyclic operation: By repeating steps S2 to S5, the production of all asphalt concrete can be completed in small batches multiple times.

[0017] The beneficial effects of this invention are:

[0018] 1. By setting an infrared sensor, the amount of asphalt inside the mixing drum can be automatically detected. At the same time, a first spring is set at the bottom of the mixing drum, so that the mixing drum descends when aggregate is added, which in turn drives the upper rack to separate from the first gear, stopping the addition of aggregate. This enables precise control of the amount of aggregate added, ensuring accurate control of the raw material ratio of asphalt concrete, and thus guaranteeing the quality of asphalt concrete.

[0019] 2. By installing an electric pole at the bottom of the mixing tank, the material can be automatically discharged after mixing. At the same time, by installing a first spring on the support legs of the mixing tank, it can automatically reset after the material is discharged. The asphalt is automatically fed by an infrared sensor, and the cycle is repeated. After the ratio is set, it can ensure that the ratio does not change, thus enabling multiple batches of automatic production without the need for manual transportation and feeding, thereby saving labor costs and time.

[0020] 3. By setting a switching mechanism, aggregate feeding and material mixing can be completed by the same motor, and mixing can start immediately after feeding is completed. The structure is compact and the cost is reduced.

[0021] 4. This invention has the functions of automatic feeding, automatic mixing, and automatic control of component ratio, so that the preparation of asphalt concrete can be completed by one piece of equipment, reducing equipment costs. Attached Figure Description

[0022] Figure 1 This is a three-dimensional view of the material feeding process in this invention;

[0023] Figure 2 This is a three-dimensional diagram of the stirring process during the present invention.

[0024] Figure 3 This is a three-dimensional diagram of the internal structure of the material after discharge according to the present invention;

[0025] Figure 4 This is a three-dimensional view of the internal structure of the aggregate feeding device of the present invention;

[0026] Figure 5 For the present invention Figure 1 A magnified view of a section at point I;

[0027] Figure 6 For the present invention Figure 2 Enlarged view of a section at point II;

[0028] Figure 7 For the present invention Figure 3 A magnified view of a section at point III.

[0029] In the diagram, the components are: support plate 1, first bracket 11, feed inlet 111, infrared sensor 112, second bracket 12, third bracket 13, receiving trough 14, mixing tank 2, support leg 21, first spring 22, sleeve 23, electric pole 241, discharge gate 242, connecting shaft 251, mixing shaft 252, fixing plate 26, fixing shaft 261, feed trough 31, feed shaft 32, transmission disc 321, pawl 322, ratchet 33, first driven pulley 34, first transmission belt 35, first driving pulley 36, first gear 41, motor 421, rocker arm 422, transmission component 43, upper rack 431, lower rack 432, plate 433, second gear 44, second driving pulley 45, second driven pulley 51, second transmission belt 52, second spring 53, tension wheel 54, adjusting plate 61, roller 611, and tension spring 62. Detailed Implementation

[0030] 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.

[0031] It should be noted that when a component is said to be "attached" to another component, it can be directly on the other component or it can be in the middle of another component. When a component is said to be "set" to another component, it can be directly set to the other component or it may also be in the middle of another component. When a component is said to be "fixed" to another component, it can be directly fixed to the other component or it may also be in the middle of another component.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] like Figures 1-3 As shown, an asphalt concrete preparation system includes: a support plate 1, a mixing tank 2 disposed above the support plate 1, and a mixing assembly disposed inside the mixing tank 2; a feeding mechanism disposed above the mixing tank 2, the feeding mechanism being used to add aggregate and asphalt into the mixing tank 2 respectively; and a driving mechanism disposed on the support plate 1, the driving mechanism being used to control the amount of aggregate added and to drive the mixing assembly to move.

[0034] Preferred, such as Figures 1-3 As shown, the feeding mechanism includes: a first bracket 11, fixedly connected to one side of the support plate 1, with an inlet 111 for adding asphalt into the mixing tank 2 and an infrared sensor 112 for detecting the asphalt depth at the bottom of the mixing tank 2 fixedly installed at the upper end of the first bracket 11; and a second bracket 12, fixedly connected to the other side of the support plate 1, with a feeding trough 31 for adding aggregate into the mixing tank 2 fixedly installed at the upper end of the second bracket 12.

[0035] Preferred, such as Figures 1-7 As shown, the driving mechanism includes: a feed shaft 32, rotatably connected to the feed trough 31, with a spiral blade fixedly connected to the feed shaft 32; one end of the feed shaft 32 extends out of the feed trough 31 and is rotatably connected to a first driven pulley 34; an adjustment component for controlling the unidirectional rotation of the feed shaft 32 is provided between the first driven pulley 34 and the feed trough 31; the first driven pulley 34 is connected to a first driving pulley 36 rotatably connected to the second bracket 12 via a first transmission belt 35; a connecting shaft 251, rotatably connected to the mixing tank 2; a second driven pulley 51 fixedly connected to the outer end of the connecting shaft 251; the second driven pulley 51 is connected to a second driving pulley 45 via a second transmission belt 52; the second driving pulley 45 is rotatably connected to a third bracket 13 fixedly connected to the support plate 1; and a motor 421 fixedly connected to the second bracket 12; the output end of the motor 421 is connected to a switching component for driving the first driving pulley 36 or the second driving pulley 45 to rotate.

[0036] Preferred, such as Figure 1 and Figure 4 As shown, the adjustment assembly includes: a ratchet 33, which is fixedly connected to the end face of the first driven pulley 34 and rotatably connected to the feed shaft 32; and a transmission disk 321, which is fixedly connected to the feed shaft 32, and the end face of the transmission disk 321 is provided with a pawl 322 that cooperates with the ratchet 33.

[0037] Preferred, such as Figure 1 , Figure 5 and Figure 6As shown, the switching assembly includes: a first gear 41, coaxially fixedly connected to the end face of the first drive pulley 36, and rotatably connected to the second bracket 12; a second gear 44, coaxially fixedly connected to the end face of the second drive pulley 45, and rotatably connected to the third bracket 13; and a transmission component 43, disposed above the support plate 1, the transmission component 43 having a slat 433, an upper rack 431 for meshing with the first gear 41, and a lower rack 432 for meshing with the second gear 44, one end of the transmission component 43 being rotatably connected to the third bracket 12. A rocker arm 422 is fixedly connected to the output end of the motor 421. A tension spring 62 is installed between the other end of the transmission member 43 and the second bracket 12 to pull the transmission member 43 upward so that the upper rack 431 meshes with the first gear 41. An adjusting plate 61 is disposed above the support plate 1. A roller 611 for rolling cooperation with the plate 433 is installed at the upper end of the adjusting plate 61. By moving the adjusting plate 61 downward, the roller 611 can be driven to contact the plate 433 and press down the transmission member 43 so that the lower rack 432 meshes with the second gear 44.

[0038] It is understandable that, such as Figure 5 and Figure 6 As shown, the slat 433 and the upper rack 431 are located on the same side of the transmission member 43, and the lower rack 432 is located on the other side of the transmission member 43.

[0039] Preferred, such as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a number of support legs 21 are fixedly connected to the lower end of the mixing tank 2. A sleeve 23 that is fixedly connected to the support plate 1 is slidably connected to the support leg 21. A first spring 22 for pushing the support leg 21 to move upward is installed between the support leg 21 and the sleeve 23. One of the support legs 21 is fixedly connected to the adjusting plate 61.

[0040] It is understandable that, such as Figures 1-6 As shown, the infrared sensor 112 can automatically detect the amount of asphalt inside the mixing drum 2. At the same time, a first spring 22 is set below the mixing drum 2 so that the mixing drum 2 descends when aggregate is added, which can drive the upper rack 431 to separate from the first gear 41, stopping the addition of aggregate. This enables precise control of the amount of aggregate added and ensures accurate control of the proportion of asphalt concrete raw materials.

[0041] It is worth mentioning that, such as Figure 1 and Figure 2 As shown, there are four legs 21, which are symmetrically distributed in pairs.

[0042] Preferred, such as Figure 3 and Figure 7 As shown, a fixing plate 26 is fixedly connected to the outer side of the mixing tank 2, and a fixing shaft 261 is fixedly connected to the lower part of the fixing plate 26. A tensioning wheel 54 placed in the second transmission belt 52 is slidably connected to the fixing shaft 261, and a second spring 53 is provided between the fixing plate 26 and the tensioning wheel 54 and sleeved on the fixing shaft 261.

[0043] Preferred, such as Figure 3 As shown, a discharge gate 242 is provided at the lower end of the mixing tank 2, and an electric rod 241 is rotatably connected between the discharge gate 242 and the mixing tank 2. A receiving trough 14 is provided on the support plate 1 below the discharge gate 242.

[0044] It is understandable that, such as Figure 3 , Figure 5 and Figure 6 As shown, after mixing is completed, the discharge gate 242 can be opened by the electric rod 241 to automatically discharge the material, and the mixing tank 2 can be automatically reset under the action of the first spring 22. The infrared sensor 112 automatically feeds the asphalt, and the cycle works. After the ratio is set, the ratio can be guaranteed not to change, so that multiple batches of automatic production can be carried out.

[0045] Preferred, such as Figure 3 and Figure 7 As shown, the stirring assembly includes a stirring shaft 252 rotatably connected to the stirring tank 2, stirring blades are fixedly connected to the stirring shaft 252, and one end of the stirring shaft 252 is fixedly connected to the connecting shaft 251.

[0046] like Figures 1-7 As shown, a method for preparing asphalt concrete, using the asphalt concrete preparation system described above, includes:

[0047] S1. Preparations: such as... Figure 1 As shown, the aggregates in the asphalt concrete raw materials to be mixed are first added into the feed trough 31, and the feed pipe for conveying asphalt is connected to the flange of the feed port 111. When the raw materials are ready, the infrared sensor 112 is activated to complete the preparation work.

[0048] S2. Feeding: Since the infrared sensor 112 does not detect asphalt, it controls the feed inlet 111 to open, adding asphalt into the mixing tank 2. When the asphalt at the bottom of the mixing tank 2 reaches the set depth, the infrared sensor 112 is triggered to close the feed inlet 111. At the same time, the motor 421 is started, driving the rocker arm 422, which is fixedly connected to it, to rotate. Since the rocker arm 422 is rotatably connected to the transmission component 43, and the tension spring 62 applies an upward force, the upper rack 431 meshes with the first gear 41. Figure 5 At this time, due to the rotation of the rocker arm 422, the transmission component 43 connected to it reciprocates, thereby driving the first gear 41 to reciprocate, causing the first driving pulley 36, which is fixedly connected to the first gear 41, to reciprocate. This, in turn, drives the first driven pulley 34 to reciprocate via the first transmission belt 35. Since the first driven pulley 34 is fixedly connected to the ratchet 33 and a pawl 322 is provided on the transmission disc 321, as... Figure 4 Due to the cooperation between the pawl 322 and the ratchet 33, the reciprocating rotation of the first driven pulley 34 is converted into the unidirectional rotation of the transmission disc 321, thereby driving the feed shaft 32 and the spiral blade to rotate for feeding aggregate. As the aggregate is gradually added, the weight of the mixing tank 2 gradually increases, thereby driving the mixing tank 2 to move downward against the first spring 22, thereby driving the adjusting plate 61 to move downward. After the adjusting plate 61 moves down a certain distance, the roller 611 contacts the plate 433 and applies a downward force to it, thereby overcoming the force of the tension spring 62 and pressing down the transmission component 43, so that the upper rack 431 disengages from the first gear 41, and at the same time controls the proportion of aggregate in the mixing tank 2 to complete the feeding.

[0049] S3. Stirring: After feeding is complete, since the roller 611 is located directly above the second gear 44, the upper rack 431 disengages from the first gear 41, and the lower rack 432 meshes with the second gear 44. Figure 6 At this time, as the motor 421 continues to rotate, the transmission component 43 drives the second gear 44 to reciprocate, which in turn drives the second drive pulley 45 to reciprocate. Because a fixed plate 26 is provided on the mixing tank 2, and a fixed shaft 261 slidably connected to the tension wheel 54 is provided below it, and the tension wheel 54 is placed inside the second transmission belt 52, the tension of the second transmission belt 52 is maintained by the force of the second spring 53. Figure 7 Therefore, the second driving pulley 45 can drive the second driven pulley 51 to rotate back and forth, thereby driving the connecting shaft 251 and the stirring shaft 252 to rotate back and forth, thus completing the stirring.

[0050] S4. Discharge: After mixing is complete, motor 421 automatically stops and infrared sensor 112 is turned off, and discharge gate 242 is opened using electric pole 241. Figure 3The mixed asphalt concrete is discharged from the bottom of the mixing drum 2 into the receiving trough 14 to complete the material discharge;

[0051] S5. Reset: After the material is discharged, start the electric pole 241 and close the discharge gate 242. Simultaneously, due to the emptying of the asphalt concrete inside the mixing drum 2, the force overcoming the first spring 22 is lost, causing the mixing drum 2 to rise. This causes the roller 611 to stop pressing down on the slats 433, thus losing the downward force over the tension spring 62. This causes the transmission component 43 to be pulled upward by the tension spring 62, i.e., the lower rack 432 disengages from the second gear 44, while the upper gear 431 meshes with the first gear 41, completing the reset. Figure 1 ;

[0052] S6. Cyclic Work: By repeating steps S2 to S5, the production of all asphalt concrete can be completed in small batches and multiple times.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A system for producing asphalt concrete, characterized in that, include: A support plate, above which a mixing tank is provided, and inside the mixing tank a mixing assembly; A feeding mechanism is located above the mixing tank, and the feeding mechanism is used to add aggregate and asphalt into the mixing tank respectively; A drive mechanism is mounted on the support plate. The drive mechanism is used to control the amount of aggregate added and to drive the mixing assembly. The feeding mechanism includes: a first bracket, fixedly connected to one side of the support plate, the upper end of the first bracket being fixedly installed with a feed inlet for adding asphalt into the mixing tank and an infrared sensor for detecting the asphalt depth at the bottom of the mixing tank; and a second bracket, fixedly connected to the other side of the support plate, the upper end of the second bracket being fixedly installed with a feed trough for adding aggregate into the mixing tank. The driving mechanism includes: a feed shaft rotatably connected to the feed trough, with helical blades fixedly connected to the feed shaft; one end of the feed shaft extends out of the feed trough and is rotatably connected to a first driven pulley; an adjustment component for controlling the unidirectional rotation of the feed shaft is provided between the first driven pulley and the feed trough; the first driven pulley is connected to a first driving pulley rotatably connected to a second bracket via a first transmission belt; a connecting shaft rotatably connected to the mixing tank, with a second driven pulley fixedly connected to the outer end of the connecting shaft; the second driven pulley is connected to a second driving pulley via a second transmission belt; the second driving pulley is rotatably connected to a third bracket fixedly connected to the support plate; and a motor fixedly connected to the second bracket, with a switching component connected to the output end of the motor for driving the first driving pulley or the second driving pulley to rotate. The switching assembly includes: a first gear, coaxially fixedly connected to the end face of the first drive pulley, and rotatably connected to the second bracket; a second gear, coaxially fixedly connected to the end face of the second drive pulley, and rotatably connected to the third bracket; a transmission component, disposed above the support plate, the transmission component having a slat, an upper rack for meshing with the first gear, and a lower rack for meshing with the second gear, one end of the transmission component being rotatably connected to a rocker arm fixedly connected to the motor output end, and the other end of the transmission component being fitted with a tension spring between the transmission component and the second bracket for pulling the transmission component upward to make the upper rack mesh with the first gear; and an adjusting plate, disposed above the support plate, the upper end of the adjusting plate being fitted with a roller for rolling cooperation with the slat, and by moving the adjusting plate downward, the roller can be driven to contact the slat and press down the transmission component to make the lower rack mesh with the second gear. The lower end of the mixing tank is fixedly connected to several legs, and a sleeve fixedly connected to the support plate is slidably connected to the legs. A first spring for pushing the legs to move upward is installed between the legs and the sleeve. One of the legs is fixedly connected to the adjusting plate. The stirring assembly includes a stirring shaft rotatably connected inside the stirring tank, stirring blades fixedly connected to the stirring shaft, and one end of the stirring shaft fixedly connected to a connecting shaft.

2. The system for preparing asphalt concrete according to claim 1, characterized in that, The adjustment component includes: A ratchet is fixedly connected to the end face of the first driven pulley and rotatably connected to the feed shaft; A transmission disc is fixedly connected to the feed shaft, and the end face of the transmission disc is provided with a pawl that cooperates with the ratchet.

3. The system for preparing asphalt concrete according to claim 2, characterized in that, A fixing plate is fixedly connected to the outer side of the mixing tank, and a fixing shaft is fixedly connected to the lower part of the fixing plate. A tensioning wheel placed in the second transmission belt is slidably connected to the fixing shaft, and a second spring sleeved on the fixing shaft is provided between the fixing plate and the tensioning wheel.

4. The asphalt concrete preparation system according to claim 3, characterized in that, The mixing tank is provided with a discharge gate at its lower end. An electric rod is rotatably connected between the discharge gate and the mixing tank, and a receiving trough is provided on the support plate below the discharge gate.

5. A method for preparing asphalt concrete, using the asphalt concrete preparation system as described in claim 4, characterized in that, include: S1. Preparation: First, add the aggregate from the asphalt concrete raw materials to be mixed into the feed trough, and at the same time connect the feed pipe for conveying asphalt to the feed port flange. When the raw materials are ready, start the infrared sensor to complete the preparation. S2. Feeding: Add asphalt into the mixing drum through the feed inlet until the asphalt at the bottom of the mixing drum reaches the set depth, then close the feed inlet. At this time, under the action of the tension spring, the upper rack meshes with the first gear, the motor is started, and the rocker arm drives the transmission component to move back and forth, thereby driving the first gear and the first driving pulley to rotate back and forth, thus driving the first driven pulley to rotate back and forth. Due to the cooperation of the pawl and the ratchet, the reciprocating rotation of the first driven pulley is converted into the unidirectional rotation of the transmission disc, that is, driving the spiral blade to rotate to feed the aggregate, so that the weight of the mixing drum gradually increases and moves downward, driving the roller to press down the transmission component to disengage the upper rack from the first gear, while controlling the proportion of aggregate in the mixing drum, thus completing the feeding. S3. Stirring: After feeding is completed, the lower rack and the second gear mesh with each other under the action of the roller. At this time, as the motor continues to rotate, it drives the second gear and the second drive pulley to rotate back and forth. The tensioning wheel maintains the tension of the second transmission belt, thus driving the second driven pulley to rotate back and forth, so that the stirring shaft and stirring blades rotate back and forth to complete the stirring. S4. Discharge: After mixing is completed, the motor will automatically stop and the infrared sensor will be turned off. The discharge door will be opened using a pole, and the mixed asphalt concrete will be discharged from the bottom of the mixing drum into the receiving trough to complete the discharge. S5. Reset: After the material is unloaded, start the electric pole and close the discharge gate. At the same time, due to the emptying of the asphalt concrete inside the mixing drum, the mixing drum is driven to rise under the action of the first spring, which causes the roller to stop pressing down on the strip. Therefore, under the action of the tension spring, the upper gear is driven to mesh with the first gear, and the reset is completed. S6. Cyclic Work: By repeating steps S2 to S5, the production of all asphalt concrete can be completed in small batches and multiple times.

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