A device for mixing a drainage asphalt mixture

Abstract

The present application relates to drainage asphalt mixture preparation device field, specifically said is a kind of drainage asphalt mixture mixing device, including the mixing and stirring of raw materials mixing and stirring bin, the mixing and stirring bin adopts double set of stirring blade structure, the inside of the shell of mixing and stirring bin is symmetrically welded with limit baffle, the upper of mixing and stirring bin is equipped with the ingredient bin assembly for storing aggregate and modifier;Ingredient bin assembly is combined by hot material bin body and cold material bin body, along horizontal direction, cold material bin body is located between two hot material bin bodies, hot material bin body discharge end adopts e-type gate unloading, cold material bin body is equidistantly provided with placing hole in lower position, each placing hole is inserted with ration block, the inside of ration block is provided with discharge slot, the bottom of discharge slot is connected with discharge hole, the orifice of discharge hole is symmetrically located in the two side walls of ration block, the bottom position close to cold material bin body is installed with deflection column by shaft rod, the present application has the characteristics of high asphalt mixing efficiency.

Description

Technical Field

[0001] This invention relates to the field of drainage asphalt mixture preparation equipment, specifically a mixing device for drainage asphalt mixture. Background Technology

[0002] Drainage asphalt pavement, also known as permeable asphalt pavement, refers to a new type of asphalt concrete surface layer with a void ratio of about 20% after compaction, which can form drainage channels inside the mixture. Its essence is an open-graded asphalt mixture with a skeleton-void structure formed by single-size crushed stone according to the interlocking mechanism.

[0003] This drainage asphalt is generally made by mixing petroleum asphalt and basalt aggregate. The mixture is typically mixed using an intermittent mixer, with the feeding speed of the cold aggregate bins controlled to maintain a consistent target mix ratio and cold aggregate proportion, resulting in output roughly equivalent to normal production. The cold aggregate includes modifiers that enhance the properties of the asphalt.

[0004] Aggregates, modifiers, and asphalt are sequentially fed into the mixing pot via unloading equipment. The modifier is mostly released at fixed points, which causes the modifier to accumulate in the same area of ​​the aggregate at the initial position. This results in a longer mixing and melting time between the modifier and the hot aggregate, affecting the overall asphalt preparation time. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a mixing device for drainage asphalt mixture.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a mixing device for drainage asphalt mixture, including a mixing bin for mixing raw materials, the mixing bin adopts a double-set mixing blade structure, limit baffles are symmetrically welded on the inner side of the shell of the mixing bin, and a batching bin assembly for storing aggregates and modifiers is installed directly above the mixing bin. The batching silo assembly consists of a hot material silo and a cold material silo. The cold material silo is located between the two hot material silos in a horizontal direction. The hot material silo uses a jaw gate for unloading at its discharge end. The cold material silo has placement holes at equal intervals at its lower position. Each placement hole contains a metering block. The metering block has a discharge trough inside, and the bottom of the discharge trough is connected to a discharge hole. The openings of the discharge holes are symmetrically located on the two side walls of the metering block. Near the bottom of the cold material silo, a deflection column is installed via a shaft. Each deflection column has a positioning hole at its center, and a portion of the metering block is inserted into the inner wall of the positioning hole. A limit stop is fixedly installed between the deflection column and the cold material silo. A positioning strip is welded to the outer wall of the deflection column. The positioning strip is in contact with the limit stop but not connected. An elastic band is embedded at the end of the positioning strip, and the ends of several elastic bands are embedded in the bottom of the cold material silo. A drive component for dispersing and unloading the metering blocks is installed on the outer wall of the cold material silo. The driving component includes a hydraulic push rod installed on the outer wall of the cold material hopper. The output end of the hydraulic push rod is connected to a driving frame. A vertical rod is fixedly connected to the center of the bottom of the driving frame. An outer sleeve is fitted to the bottom of the vertical rod. A square block is fixedly connected to the bottom of the outer sleeve. A return spring is installed between the vertical rod and the outer sleeve. Swing arms are rotatably installed on both sides of the driving frame. The ends of the swing arms are rotatably connected to limit blocks via rotating shafts. Positioning shafts are inserted into the center of both the limit blocks and the square blocks, and one end of the positioning shaft is fixed to the side wall of the metering block.

[0007] Specifically, a mounting hole is provided at the center of the limiting block, a gear plate is fixedly installed on the side wall of one end of the swing arm at the mounting hole, a through hole is provided at the concentric position inside the positioning shaft, and a semi-circular groove is provided at the bottom of any other metering block that is not in the center of the cold material bin, and the semi-circular groove is connected to the discharge groove. A sealing plate is provided above the semi-circular groove, and the sealing plate is fixedly installed on the inner wall of the discharge groove to block the discharge hole. A discharge roller is rotatably installed on the inner wall of the semi-circular groove, and a discharge hole is provided at the center of the discharge roller. A shaft is provided on both ends of the discharge roller, one shaft is rotatably embedded inside the metering block, and the other shaft is inserted into the inner wall of the through hole. An annular groove is provided in the area of ​​the shaft at the mounting hole, and an annular tooth block is provided at the outer ring of the annular groove, and the annular tooth block meshes with the gear plate.

[0008] Specifically, the discharge hole is composed of a combination of a fan-shaped hole and a rectangular hole, with the fan-shaped hole positioned close to the top of the semi-circular groove.

[0009] Specifically, steel balls are embedded in the bottom of both the square block and the limiting block.

[0010] Specifically, the bottom end face of the discharge hole is an inclined surface, and the height of the discharge hole is less than the height of the positioning hole.

[0011] Specifically, magnets are embedded in the contact surfaces of the limiting block and the positioning strip.

[0012] Specifically, the distance between the bottom of the limiting block and the limiting baffle is greater than the distance between the top of the quantitative block and the top of the positioning hole, and the difference between the two distances is less than the height of the positioning hole.

[0013] Specifically, the bottom of the limiting baffle is provided with a reinforcing plate, and the reinforcing plates are distributed at equal intervals in the horizontal direction.

[0014] The beneficial effects of this invention are: The present invention discloses a mixing device for drainage asphalt mixture. The present invention is equipped with components such as a batching bin assembly. Through a driving component, a multi-position quantitative block can be deflected at a designated position, so that the modifier is added from different directions on the top of the mixing bin. This achieves the effect of dispersed addition of the modifier, avoids the modifier falling into the mixing bin in a fixed point, accelerates the melting time of the modifier, and effectively improves the overall asphalt preparation time. The present invention discloses a mixing device for drainage asphalt mixture. When any fixed quantity block in a non-central position relative to the cold aggregate bin slides along the placement hole under the action of a hydraulic pusher, modifier is not added after the discharge hole is exposed outside the positioning hole. This process continues until the fixed quantity block deflects. After the fixed quantity block deflects, the swing arm rotates relative to the relative shaft, and the annular toothed block and the toothed disc mesh with each other, thereby driving the shaft to rotate on the inner wall of the through hole, that is, driving the discharge roller to rotate in the semi-circular groove. This causes the discharge hole to move to the connection between the semi-circular groove and the discharge trough, and then modifier is added. During this process, the area for adding modifier at this position is further increased, further reducing the concentration of modifier during addition. The melting time of the modifier is further improved, and the overall mixing effect of asphalt is faster. Furthermore, aligning the fan-shaped hole with the connection between the semi-circular groove and the discharge trough increases the rotatable angle of the discharge hole working conditions, meeting the needs of adding different amounts of modifier. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 A partial structural cross-section of the present invention. Figure 1 ; Figure 3 For the present invention Figure 2 A magnified view of a portion of region A in the middle; Figure 4 A partial structural cross-section of the present invention. Figure 2 ; Figure 5 For the present invention Figure 4 A magnified view of a portion of region B in the middle; Figure 6 This is a partial structural cross-sectional view of the present invention; In the diagram: 1. Mixing bin; 2. Batching bin assembly; 11. Limiting baffle; 21. Hot material bin body; 22. Cold material bin body; 31. Placement hole; 32. Metering block; 33. Discharge hole; 34. Deflection column; 35. Limiting block; 36. Positioning strip; 37. Elastic band; 321. Discharge chute; 341. Positioning hole; 230. Vertical rod; 231. Hydraulic push rod; 232. Drive frame; 233. Outer sleeve; 234. Square block; 235. Return spring; 236. Positioning shaft; 237. Swing arm; 238. Limiting block; 40. Annular groove; 41. Semicircular groove; 42. Discharge roller; 43. Discharge hole; 44. Sealing plate; 45. Through hole; 46. Shaft; 47. Mounting hole; 48. Annular toothed block; 49. Toothed disc. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] Furthermore, the terms used below are defined based on the functionality of this invention and may vary depending on the user's, operator's, or conventions. Therefore, these terms are defined based on the entire contents of this specification.

[0019] See Figure 1-6 The present invention discloses a mixing device for a drainage asphalt mixture, comprising a mixing chamber 1 for mixing raw materials. The mixing chamber 1 adopts a double-set mixing blade structure. Limiting baffles 11 are symmetrically welded to the inner side of the shell of the mixing chamber 1. A reinforcing plate is provided at the bottom of the limiting baffle 11, and several reinforcing plates are distributed laterally at equal intervals to increase the connection strength between the limiting baffle 11 and the mixing chamber 1. A batching bin assembly 2 for storing aggregates and modifiers is installed directly above the mixing chamber 1. The batching bin assembly 2 is composed of a hot aggregate bin 21 and a cold aggregate bin 22. The cold aggregate bin 22 is located between the two hot aggregate bins 21 in the horizontal direction. The aggregate stored in the hot aggregate bin 21 is basalt aggregate. The basalt aggregate is pre-stored in the hot aggregate bin 21 after being heated to 180-195℃ and passing through a hot screen. The basalt aggregate stored in the hot aggregate bin 21 at different locations has different particle sizes. The basalt aggregate enters the mixing bin 1 before the modifier. After the modifier is fully melted, hot asphalt is added for wet mixing. The wet mixing time after spraying asphalt should be adjusted appropriately according to the mixing situation, usually not less than 45 seconds, to ensure that the molten modifier can be fully mixed with the asphalt. The hot material bin 21 uses a jaw gate for unloading at its discharge end. The cold material bin 22 has evenly spaced placement holes 31 at its lower position. A metering block 32 is inserted into each placement hole 31. The metering block 32 has a discharge trough 321 inside, and the bottom of the discharge trough 321 is connected to a discharge hole 33. The openings of the discharge holes 33 are symmetrically located on both sides of the metering block 32. Near the bottom of the cold material bin 22, deflection columns 34 are installed via shafts. Each deflection column 34 has a positioning hole 341 at its center, and a portion of the metering block 32 is inserted into the positioning hole 34. 1. In the initial position, the discharge hole 33 is located inside the positioning hole 341, and the height of the discharge hole 33 is less than the height of the positioning hole 341. The discharge hole 33 is sealed by the positioning hole 341. The space size of each discharge trough 321 is consistent. The modifier stored in the hot material bin 21 can enter the discharge trough 321 in equal amounts. The modifier in several discharge troughs 321 is combined to form the total amount of modifier in a single mixing process. This total amount meets the required amount of modifier for a single asphalt mixing process and ensures that the modifier dosage is consistent in any asphalt mixing process. A limiting block 35 is fixedly installed between the deflection column 34 and the cold material bin 22. A positioning strip 36 is welded to the outer wall of the deflection column 34. The positioning strip 36 is in contact with the limiting block 35 but not connected. An elastic band 37 is embedded at the end of the positioning strip 36. Several elastic bands 37 are embedded at the bottom of the cold material bin 22. A driving component 23 for driving the quantitative block 32 to disperse and unload is installed on the outer wall of the cold material bin 22. The contact surface between the limiting block 35 and the deflection column 34 is an arc surface. This arc surface also serves as a sealing surface to seal the top edge of the positioning hole 341. The driving component 23 includes a hydraulic push rod 231 installed on the outer wall of the cold material bin 22. The output end of the hydraulic push rod 231 is connected to a driving frame 232. The hydraulic push rod 231 can push the driving frame 232 to rise or fall vertically. A vertical rod 230 is fixedly connected to the bottom center of the driving frame 232. The vertical rod 230 and the driving frame 232 move synchronously. An outer sleeve 233 is sleeved on the bottom of the vertical rod 230. In the initial position, the top of the outer sleeve 233 rests on the bottom of the vertical rod 230. The bottom of the vertical rod 230 can slide along the inside of the outer sleeve 233. A square block 234 is fixedly connected to the bottom of the outer tube 233. A return spring 235 is installed between the vertical rod 230 and the outer tube 233. Swing arms 237 are rotatably installed on both sides of the drive frame 232, and the swing arms 237 are inclined at any position. The end of the swing arm 237 is rotatably connected to a limit block 238 through a rotating shaft. A positioning shaft 236 is inserted into the center of both the limit block 238 and the square block 234. The positioning shaft 236 can move synchronously with the drive frame 232, and one end of the positioning shaft 236 is fixed to the side wall of the metering block 32. When the modifier needs to be added, it is only necessary to control the hydraulic push rod 231 to vertically drive the drive frame 232 and the positioning shaft 236 to descend synchronously. The positioning shaft 236 then drives the metering block 32 to slide vertically down along the placement hole 31. When the drive frame 232 descends to a certain distance, the lower end face of the square block 234 and the limit block 238 touches the limit baffle. When the upper surface of 11 contacts the positioning hole 31, the top of the quantitative block 32 separates from the placement hole 31 and is located in the positioning hole 341. The hydraulic push rod 231 continues to descend, and the vertical rod 230 slides along the inner wall of the outer sleeve 233 and compresses the return spring 235. After the square block 234 contacts the limiting baffle 11, its position remains unchanged. One end of the limiting block 238 is squeezed by the swing arm 237 and slides along the upper surface of the limiting baffle 11. Steel balls are embedded in the bottom of both the square block 234 and the limiting block 238. Specifically, the steel balls roll on the upper surface of the limiting baffle 11. Compared with the direct contact between the limiting block 238 and the limiting baffle 11, the friction is smaller, and the wear between the two is smaller. The top of the quantitative block 32 deflects together with the deflection column 34. The deflection of the deflection column 34 causes the elastic band 37 to stretch. The elastic band 37 has a rebound force, that is, the discharge hole 33 in each quantitative block 32 can cover different areas in the mixing chamber 1. This state can be as follows: Figure 6 As shown, this achieves the effect of dispersing the modifier, avoiding the modifier from falling into the mixing chamber 1 in a fixed point.

[0020] It should be noted that when the top of the metering block 32 slides along the placement hole 31 into the area of ​​the positioning hole 341, the modifier will be added as soon as the discharge hole 33 in the metering block 32 leaks out into the positioning hole 341. Furthermore, the amount of modifier added during the process of the metering block 32 sliding down vertically until it deflects is less than the amount of modifier required. That is, the remaining modifier is added after the metering block 32 deflects.

[0021] After the modifier is added in one go, the hydraulic push rod 231 is raised vertically, the swing arm 237 removes the squeezing force on the limit block 238, and the elastic band 37 has a rebound force to drive the deflection column 34 to deflect to the initial position. As the hydraulic push rod 231 continues to work, the metering block 32 will rise to the initial position along the placement hole 31.

[0022] The included angle between the two ends of the arc surface of the limiting block 35 is the maximum deflection angle of the deflection column 34 and the metering block 32. The deflection angle of the metering block 32 does not exceed the above maximum deflection angle. Within this range, the limiting block 35 can always seal the positioning hole 341 of the deflection column 34.

[0023] The bottom end face of the discharge hole 33 is an inclined surface with an inclination angle of 30-45°. After passing through this inclined surface, the modifier falls into the mixing chamber 1 in a parabolic manner. At the same time, the bottom of the discharge hole 33 should not be a vertical angle to prevent the modifier from remaining inside the vertical angle. Furthermore, the distance between the bottom of the limiting block 238 and the limiting baffle 11 is greater than the distance between the top of the quantitative block 32 and the top of the positioning hole 341. This ensures that after the bottom of the limiting block 238 contacts the upper surface of the limiting baffle 11, the top edge of the quantitative block 32 can enter the positioning hole 341 area from the placement hole 31 area, and the difference in distance between the two is less than the height of the positioning hole 341. This ensures that the top of the quantitative block 32 can enter the positioning hole 341 area without separation.

[0024] When the quantitative block 32 returns to its initial vertical position after deflection, the positioning strip 36 can move to one side of the limiting block 35 again. Magnets are embedded in the contact surfaces of the limiting block 35 and the positioning strip 36, and the magnets can attract each other. This magnetic attraction further locks the position of the quantitative block 32.

[0025] See Figures 1-6 In another embodiment, the limiting block 238 has a mounting hole 47 at its center, the swing arm 237 has a toothed disc 49 fixedly mounted on one side wall of the mounting hole 47, the positioning shaft 236 has a through hole 45 at a concentric position inside, and any other metering block 32 at a non-central position relative to the cold material bin 22 has a semi-circular groove 41 at its bottom, and the semi-circular groove 41 is connected to the discharge groove 321. A sealing plate 44 is provided above the semi-circular groove 41, and the sealing plate 44 is fixedly installed on the inner wall of the discharge groove 321 and blocks the discharge hole 33. It can be understood that the method of adding modifier to the metering block 32 corresponding to the position of the square block 234 (i.e. the metering block 32 at the center position relative to the cold material bin 22) remains unchanged. A discharge roller 42 is rotatably mounted on the inner wall of the semicircular groove 41. A discharge hole 43 is centrally located inside the discharge roller 42. In the initial state, the discharge hole 43 is relatively inclined. The area of ​​the discharge roller 42 without the discharge hole 43 abuts against the connection between the semicircular groove 41 and the discharge trough 321. Shafts 46 are provided on both ends of the discharge roller 42. One shaft 46 is rotatably embedded inside the metering block 32, and the other shaft 46 is inserted into the inner wall of the through hole 45. An annular groove 40 is provided in the area of ​​the mounting hole 47 on the shaft 46. An annular toothed block 48 is provided on the outer ring of the annular groove 40, and the annular toothed block 48 meshes with the toothed disc 49. In this state, when any metering block 32 is not centrally located relative to the cold material bin 22, the hydraulic push rod 23... When the modifier slides along the placement hole 31 under the action of 1, after the discharge hole 33 is exposed to the positioning hole 341, no more modifier is added, and this process continues until the metering block 32 is deflected. When the metering block 32 is deflected, the swing arm 237 rotates relative to the shaft 46, and the annular toothed block 48 and the toothed disc 49 mesh with each other, thereby driving the shaft 46 to rotate on the inner wall of the through hole 45, that is, driving the discharge roller 42 to rotate in the semi-circular groove 41, so that the discharge hole 43 is moved to the connection between the semi-circular groove 41 and the discharge groove 321, and then the modifier is added. During this process, the area for adding modifier at this position is further increased, further reducing the concentration of modifier accumulation during addition, and the melting time of modifier is further improved, resulting in faster overall mixing effect of asphalt. The discharge hole 43 is composed of a combination of a fan-shaped hole and a rectangular hole. The fan-shaped hole is located close to the top of the semi-circular groove 41. In the initial position, the edge of the fan-shaped hole coincides with the edge of the connection between the semi-circular groove 41 and the discharge trough 321. Under this condition, the modifier is added as long as the metering block 32 deflects. At the same time, aligning the fan-shaped hole with the connection between the semi-circular groove 41 and the discharge trough 321 can increase the rotatable angle of the discharge hole 43 and meet the needs of adding different amounts of modifier.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mixing device for drainage asphalt mixture, comprising a mixing chamber (1) for mixing and stirring raw materials, characterized in that, The mixing chamber (1) adopts a double-set stirring blade structure. The inner side of the shell of the mixing chamber (1) is symmetrically welded with limit baffles (11). A batching silo assembly (2) for storing aggregates and modifiers is installed directly above the mixing chamber (1). The batching bin assembly (2) is composed of a hot material bin (21) and a cold material bin (22). The cold material bin (22) is located between the two hot material bins (21) in the horizontal direction. The discharge end of the hot material bin (21) is discharged by a jaw gate. The cold material bin (22) has placement holes (31) at equal intervals at the lower position. Each placement hole (31) is inserted with a metering block (32). The inside of the metering block (32) is provided with a discharge trough (321). The bottom of the discharge trough (321) is connected to a discharge hole (33). The openings of the discharge holes (33) are symmetrically located on both sides of the metering block (32). A deflection column (33) is installed near the bottom of the cold material bin (22) by a shaft. 4) Each deflection column (34) has a positioning hole (341) in the center of its interior, and a portion of the metering block (32) is inserted into the inner wall of the positioning hole (341). A limit stop (35) is fixedly installed between the deflection column (34) and the cold material bin (22). A positioning strip (36) is welded to the outer wall of the deflection column (34), and the positioning strip (36) is in contact with the limit stop (35) but not connected. An elastic band (37) is embedded at the end of the positioning strip (36), and the ends of several elastic bands (37) are embedded in the bottom of the cold material bin (22). A drive component (23) for driving the metering block (32) to disperse and unload is installed on the outer wall of the cold material bin (22). The drive unit (23) includes a hydraulic push rod (231) installed on the outer wall of the cold material bin (22). The output end of the hydraulic push rod (231) is connected to a drive frame (232). A vertical rod (230) is fixedly connected to the center of the bottom of the drive frame (232). An outer sleeve (233) is sleeved on the bottom of the vertical rod (230). A square block (234) is fixedly connected to the bottom of the outer sleeve (233). A return spring (235) is installed between the vertical rod (230) and the outer sleeve (233). Swing arms (237) are rotatably installed on both sides of the drive frame (232). The end of the swing arm (237) is rotatably connected to a limit block (238) through a rotating shaft. A positioning shaft (236) is inserted into the center of both the limit block (238) and the square block (234). One end of the positioning shaft (236) is fixed to the side wall of the metering block (32).

2. The mixing device for drainage asphalt mixture according to claim 1, characterized in that: A mounting hole (47) is provided at the center of the limiting block (238). A gear plate (49) is fixedly installed on the side wall of one end of the swing arm (237) at the mounting hole (47). A through hole (45) is provided at the concentric position inside the positioning shaft (236). A semi-circular groove (41) is provided at the bottom of any other metering block (32) that is not in the center relative to the cold material bin (22). The semi-circular groove (41) is connected to the discharge trough (321). A sealing plate (44) is provided above the semi-circular groove (41). The sealing plate (44) is fixedly installed on the inner wall of the discharge trough (321) and faces the discharge trough. The material hole (33) is blocked, and the discharge roller (42) is rotatably installed on the inner wall of the semi-circular groove (41). The discharge roller (42) has a discharge hole (43) in the center of its interior. Both ends of the discharge roller (42) are provided with shafts (46). One shaft (46) is rotatably embedded in the metering block (32), and the other shaft (46) is inserted into the inner wall of the through hole (45). The area of ​​the shaft (46) in the mounting hole (47) is provided with an annular groove (40). An annular tooth block (48) is provided on the outer ring of the annular groove (40), and the annular tooth block (48) meshes with the toothed disc (49).

3. The mixing device for drainage asphalt mixture according to claim 2, characterized in that: The discharge hole (43) is composed of a fan-shaped hole and a rectangular hole connected together, and the fan-shaped hole is located close to the top of the semi-circular groove (41).

4. The mixing device for drainage asphalt mixture according to claim 1, characterized in that: Steel balls are embedded in the bottom of both the square block (234) and the limiting block (238).

5. The mixing device for drainage asphalt mixture according to claim 1, characterized in that: The bottom end face of the discharge hole (33) is an inclined surface, and the height of the discharge hole (33) is less than the height of the positioning hole (341).

6. The mixing device for drainage asphalt mixture according to claim 1, characterized in that: Magnets are embedded in the contact surfaces of the limiting block (35) and the positioning strip (36).

7. The mixing device for drainage asphalt mixture according to claim 1, characterized in that: The distance between the bottom of the limiting block (238) and the limiting baffle (11) is greater than the distance between the top of the quantitative block (32) and the top of the positioning hole (341), and the difference between the two distances is less than the height of the positioning hole (341).

8. The mixing device for drainage asphalt mixture according to claim 1, characterized in that: The bottom of the limiting baffle (11) is provided with a reinforcing plate, and the reinforcing plates are distributed horizontally at equal intervals.

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