Fine aggregate precooling device for concrete production

Abstract

The invention discloses a fine aggregate precooling device for concrete production, and belongs to the technical field of concrete production. The device comprises a machine frame, a material placing mechanism, a pre-cooling mechanism and a cold guiding mechanism, the material placing mechanism, the pre-cooling mechanism and the cold guiding mechanism are arranged on the machine frame, the pre-cooling mechanism is located on the lower side of the material placing mechanism, the top of the pre-cooling mechanism is communicated with the bottom of the material placing mechanism, the cold guiding mechanism is located below the pre-cooling mechanism, and the cold guiding mechanism is communicated with the bottom of the pre-cooling mechanism through a material guiding pipe. Compared with a water cooling mode, non-contact type pre-cooling is conducted on the fine aggregate through the pre-cooling mechanism and the cold guiding mechanism, the water content of the fine aggregate cannot be changed, it is guaranteed that the actual water-binder ratio of concrete meets the design requirement, and the strength and durability of the concrete are guaranteed; compared with an air cooling mode, the cooling speed of fine aggregate is high, the cooling effect is good, and the overall production efficiency of concrete is guaranteed; compared with a vacuum cooling mode and a liquid nitrogen rapid cooling mode, cooling liquid can be recycled, power consumption is low, and the operation cost is low.

Description

Technical Field

[0001] This invention relates to a pre-cooling device for fine aggregates in concrete production, belonging to the field of concrete production technology. Background Technology

[0002] Concrete is an artificial stone material formed by mixing cementitious materials, aggregates, water, and, if necessary, admixtures or additives in a certain proportion, followed by stirring, molding, and hardening. It is widely used in engineering projects such as houses, bridges, roads, and dams.

[0003] In the concrete production process, in order to reduce the concrete exit temperature and prevent thermal cracking, fine aggregate pre-cooling is required. Fine aggregate pre-cooling is an important measure to control the concrete pouring temperature, prevent cracking, and ensure construction quality in high-temperature environments.

[0004] Commonly used methods for precooling fine aggregates include water cooling, air cooling, vacuum cooling, and liquid nitrogen rapid cooling. Water cooling, which involves spraying cold water onto the surface of the fine aggregates, may cause uneven moisture content, leading to a deviation of the actual water-cement ratio from the design value and affecting the strength and durability of the concrete. Air cooling is slow, resulting in a decrease in overall concrete production efficiency. Vacuum cooling and liquid nitrogen rapid cooling are expensive and generally not used. Therefore, we propose a fine aggregate precooling device for concrete production to address these problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a pre-cooling device for fine aggregate in concrete production.

[0006] This invention is achieved through the following technical solution: A pre-cooling device for fine aggregate in concrete production includes a frame, and a material feeding mechanism, a pre-cooling mechanism, and a cooling guiding mechanism mounted on the frame. The pre-cooling mechanism is located below the material feeding mechanism, and its top is connected to the bottom of the material feeding mechanism. The cooling guiding mechanism is located below the pre-cooling mechanism, and its bottom is connected to the pre-cooling mechanism via a material guiding pipe.

[0007] The material handling mechanism includes a material-retarding bottom frame, a rotating outer cylinder integrally formed on the top of the material-retarding bottom frame, a feeding frame integrally formed on the top of the rotating outer cylinder, a material-retarding inner cylinder inside the rotating outer cylinder, a discharge frame integrally formed on the bottom of the material-retarding inner cylinder, and the discharge frame is connected to the material-retarding inner cylinder. A feeding port is opened on the top of the material-retarding inner cylinder, and swing horizontal shafts are provided at both ends of the material-retarding inner cylinder, and the swing horizontal shafts at both ends of the material-retarding inner cylinder are rotatably connected to the rotating outer cylinder.

[0008] The swing axis at one end of the slowing inner cylinder extends to the outside of the rotating outer cylinder. Two first bevel gears are symmetrically mounted on the swing axis, with the small ends of the two first bevel gears facing each other. A first mounting seat is provided on the outer wall of the slowing bottom frame. A first longitudinal shaft is rotatably connected to the first mounting seat. A fan-shaped bevel gear is provided on the first longitudinal shaft below the two first bevel gears, and the fan-shaped bevel gear is located above the first mounting seat. The fan-shaped bevel gear alternately meshes with the two first bevel gears.

[0009] A second bevel gear is provided on the lower side of the first mounting base on the first longitudinal shaft. The second bevel gear meshes with two third bevel gears, and the two third bevel gears are distributed on both sides of the second bevel gear. The two third bevel gears are respectively provided on two first transverse shafts. The two first transverse shafts are rotatably mounted on the outer wall of the material buffer frame through the second mounting base. A first motor is provided on the second mounting base, and the output shaft of the first motor is connected to the corresponding first transverse shaft.

[0010] The precooling mechanism includes a precooling outer frame, a cooling component is provided inside the precooling outer frame, the precooling outer frame is fixed on the frame, and the upper end of the precooling outer frame is connected to the lower end of the material feeding mechanism. The lower end of the precooling outer frame is provided with a material gathering frame whose shape and size gradually decrease from top to bottom. The bottom of the material gathering frame is provided with a discharge pipe, and the discharge pipe is connected to the upper end of the guide pipe.

[0011] The cooling assembly includes multiple hollow material-separating longitudinal frames arranged side by side and fixedly connected to the pre-cooling outer frame. The hollow material-separating longitudinal frames are arranged vertically and parallel to the plane determined by the swing trajectory of the material-laying mechanism. The top of each hollow material-separating longitudinal frame is integrally formed with a material-loosening protrusion. The cross-sectional shape of the material-loosening protrusion is an isosceles trapezoid with the upper base facing upward. All the hollow material-separating longitudinal frames are connected and interconnected through multiple parallel connecting pipes.

[0012] The hollow partition frame located at one end of the cooling assembly has multiple liquid inlet bottom pipes at the bottom and multiple liquid outlet top pipes at the top. Both the liquid inlet bottom pipes and the liquid outlet top pipes penetrate one side wall of the pre-cooling outer frame and are connected to the interior of the cooling assembly. The precooling frame is equipped with an inlet main pipe and an outlet main pipe. The inlet main pipe is connected to multiple inlet bottom pipes through inlet branch pipes, and the outlet main pipe is connected to multiple outlet top pipes through outlet branch pipes.

[0013] The cooling mechanism includes a guide cylinder, which is fixedly mounted on the frame. A feed longitudinal pipe is located at the top of one end of the guide cylinder and is connected to the lower end of the guide pipe. A discharge longitudinal pipe is located at the bottom of the guide cylinder at the end furthest from the feed longitudinal pipe. A screw conveyor is coaxially mounted on the guide cylinder, and a spiral blade is mounted on the screw conveyor. The spiral blade has a hollow structure to form a cavity inside. Both ends of the screw conveyor have coaxially opened liquid guide blind holes. Both ends of the screw conveyor have radially arranged liquid guide pipes connecting the liquid guide blind holes and the cavities. An inlet pipe is connected to the end of the screw conveyor near the discharge longitudinal pipe via a rotary joint, and the inlet pipe is fixedly mounted on the guide cylinder via a first fixing bracket. A drain pipe is connected to the end of the screw conveyor near the feed longitudinal pipe via a rotary joint, and the drain pipe is fixedly mounted on the guide cylinder via a second fixing bracket.

[0014] A crown gear is provided at one end of the auger horizontal shaft near the drain pipe. A third gear is meshed on the crown gear. The third gear is located on the second vertical shaft, which is rotatably mounted on the guide cylinder via a third mounting base.

[0015] It also includes a common drive shaft and a connecting conduit. The common drive shaft is rotatably mounted on the precooling mechanism via two fourth mounting seats. The upper end of the common drive shaft is connected to the lower end of the first longitudinal shaft, and the lower end is connected to the upper end of the second longitudinal shaft. The lower end of the connecting conduit is connected to the drain pipe, and the upper end is connected to the main inlet pipe.

[0016] The beneficial effects of this invention are as follows: 1. Coolant is introduced into the pre-cooling mechanism and the cooling conduction mechanism. The fine aggregate to be pre-cooled is poured into the feeding mechanism. After being distributed by the feeding mechanism, the fine aggregate enters the pre-cooling mechanism for cooling. After initial pre-cooling, the fine aggregate flows into the cooling conduction mechanism through the feed pipe, where it undergoes secondary pre-cooling. Compared with water cooling, this invention uses a non-contact pre-cooling mechanism and a cooling conduction mechanism to pre-cool the fine aggregate, which does not cause changes in the moisture content of the fine aggregate, ensuring that the actual water-cement ratio of the concrete meets the design requirements and guaranteeing the strength and durability of the concrete. Compared with air cooling, this invention cools the fine aggregate faster and with better cooling effect, ensuring the overall production efficiency of concrete. Compared with vacuum cooling and liquid nitrogen rapid cooling, the coolant can be recycled, and the power consumption and operating cost are low.

[0017] 2. By controlling the swing horizontal axis to reciprocate in a certain angle, the swing horizontal axis can drive the discharge frame to reciprocate in a certain angle through the slowing inner cylinder to distribute the fine aggregate, preventing the accumulation of fine aggregate during subsequent pre-cooling and affecting the pre-cooling efficiency.

[0018] 3. The cooling assembly comprises multiple hollow spacer frames arranged side-by-side. A fine aggregate pre-cooling channel is formed between every two adjacent hollow spacer frames. This creates multiple pre-cooling channels between the hollow spacer frames, increasing the contact area between the fine aggregate and the cooling assembly, thus improving the cooling effect and efficiency of the cooling assembly. The hollow spacer frames are parallel to the plane determined by the swing trajectory of the material handling mechanism, which helps to distribute the fine aggregate placed in the pre-cooling outer frame into a sufficient number of pre-cooling channels, further enhancing the cooling effect and efficiency of the cooling assembly.

[0019] 4. The coolant flows from bottom to top in the hollow partition frame, while the fine aggregate flows from top to bottom in the pre-cooling channel. This facilitates sufficient indirect contact between the coolant and the fine aggregate, pre-cooling and lowering their temperature, further enhancing the cooling effect and efficiency of the coolant on the fine aggregate. The coolant flows from the end near the discharge longitudinal pipe to the end near the feed longitudinal pipe within the spiral blades, while the fine aggregate flows from the end near the feed longitudinal pipe to the end near the discharge longitudinal pipe within the guide cylinder. This also facilitates sufficient indirect contact between the coolant and the fine aggregate, pre-cooling and lowering their temperature, further enhancing the cooling effect and efficiency of the coolant on the fine aggregate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the material handling mechanism of the present invention. The first bevel gear in the figure has been removed from the swing horizontal shaft. Figure 3 for Figure 2 A magnified view of a portion at point A; Figure 4 This is a schematic diagram of the structure of the material feeding mechanism of the present invention after the material holding bottom frame, rotating outer cylinder, feeding frame and material holding inner cylinder are cut into two parts; Figure 5 This is a schematic diagram of the precooling mechanism of the present invention; Figure 6 A schematic diagram of the structure after the invention's cooling component is cut into two parts; Figure 7 This is an exploded view of the cooling mechanism of the present invention; Figure 8 for Figure 7 A magnified view of the area at point B; Figure 9 for Figure 7 A magnified view of a portion at point A; Figure 10 This is a schematic diagram showing the structure of the material handling mechanism, precooling mechanism, cooling mechanism, material guide pipe, and connecting conduit of the present invention after they have been disassembled.

[0021] In the diagram: 1-First support, 11-Second support, 12-Inner frame installation; 2-Packaging mechanism, 21-Restraining bottom frame, 22-Rotating outer cylinder, 23-Feeding frame, 24-Restraining inner cylinder, 241-Feeding port, 25-Discharge frame, 26-Swinging horizontal axis, 27-First bevel gear, 271-Sector bevel gear, 272-First longitudinal axis, 273-First mounting base, 28-Second bevel gear, 281-Third bevel gear, 282-First horizontal axis, 283-Second mounting base, 284-First motor; 3-Precooling mechanism, 31-Precooling outer frame, 311-Material collection frame, 32-Discharge pipe, 33-Cooling component, 331-Hollow material separator longitudinal frame, 332-Material convex frame, 333-Connecting pipe, 334-Liquid inlet bottom pipe, 335-Liquid outlet top pipe, 34-Liquid inlet main pipe, 341-Liquid inlet branch pipe, 35-Liquid outlet main pipe, 351-Liquid outlet branch pipe; 4-Cooling mechanism, 41-Guiding cylinder, 42-Feeding pipe, 43-Discharge pipe, 44-Screwdriver shaft, 441-Liquid guide blind hole, 442-Rotary joint, 45-Helical blade, 451-Cavity, 452-Liquid guide pipe, 46-Liquid inlet pipe, 461-First fixed frame, 47-Drain pipe, 471-Second fixed frame, 48-Crown gear, 481-Third mounting base, 482-Second longitudinal shaft, 483-Third gear; 5- Feed pipe; 6-Fourth mounting bracket, 61-Common drive shaft; 7-Connecting conduit. Detailed Implementation

[0022] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0023] like Figures 1 to 10As shown, the present invention discloses a fine aggregate precooling device for concrete production, comprising a frame, and a material feeding mechanism 2, a precooling mechanism 3, and a cooling guiding mechanism 4 mounted on the frame. The precooling mechanism 3 is located below the material feeding mechanism 2, and its top is connected to the bottom of the material feeding mechanism 2. The cooling guiding mechanism 4 is located below the precooling mechanism 3, and is connected to the bottom of the precooling mechanism 3 via a material guide pipe 5. In use, coolant is introduced into the precooling mechanism 3 and the cooling guiding mechanism 4. The fine aggregate to be precooled is poured into the material feeding mechanism 2. After being fed by the material feeding mechanism 2, the fine aggregate enters the precooling mechanism 3 for cooling. After initial precooling by the precooling mechanism 3, the fine aggregate flows into the cooling guiding mechanism 4 through the material guide pipe 5, and then undergoes secondary precooling by the cooling guiding mechanism 4. Compared with water cooling, this invention uses a pre-cooling mechanism 3 and a cooling conduction mechanism 4 to pre-cool the fine aggregate in a non-contact manner, which does not cause changes in the moisture content of the fine aggregate, ensuring that the actual water-cement ratio of the concrete meets the design requirements and guaranteeing the strength and durability of the concrete. Compared with air cooling, this invention cools the fine aggregate faster and with better cooling effect, ensuring the overall production efficiency of concrete. Compared with vacuum cooling and liquid nitrogen rapid cooling, the coolant can be recycled, and the power consumption and operating cost are low.

[0024] Specifically, the frame includes a first support 1, and multiple inner mounting frames 12 are arranged side by side on the top of the first support 1. A second support 11 is also provided on the top of the first support 1. The material handling mechanism 2 and the pre-cooling mechanism 3 are both installed and fixed on the second support 11. The cooling mechanism 4 is installed and fixed on the inner side of the multiple inner mounting frames 12.

[0025] The material handling mechanism 2 includes a material-retarding bottom frame 21. A rotating outer cylinder 22 is integrally formed on the top of the material-retarding bottom frame 21. A feeding frame 23 is integrally formed on the top of the rotating outer cylinder 22. A material-retarding inner cylinder 24 is located inside the rotating outer cylinder 22. A discharge frame 25 is integrally formed on the bottom of the material-retarding inner cylinder 24 and is connected to it. A feeding port 241 is opened at the top of the material-retarding inner cylinder 24. Swinging horizontal shafts 26 are provided at both ends of the material-retarding inner cylinder 24, and these shafts are rotatably connected to the rotating outer cylinder 22. Fine aggregate poured into the feeding frame 23 enters the material-retarding inner cylinder 24 through the feeding port 241 and is then discharged downwards through the discharge frame 25. By controlling the swing horizontal axis 26 to reciprocate forward and reverse at a certain angle, the swing horizontal axis 26 can drive the discharge frame 25 to reciprocate at a certain angle through the slowing inner cylinder 24 to distribute the fine aggregate, preventing the accumulation of fine aggregate during subsequent pre-cooling and affecting the pre-cooling efficiency.

[0026] The swing axis 26 at one end of the inner buffer cylinder 24 extends outside the rotating outer cylinder 22. Two first bevel gears 27 are symmetrically mounted on the swing axis 26, with their small ends facing each other. A first mounting seat 273 is provided on the outer wall of the buffer bottom frame 21. A first longitudinal shaft 272 is rotatably connected to the first mounting seat 273. A sector-shaped bevel gear 271 is provided on the first longitudinal shaft 272 below the two first bevel gears 27, and the sector-shaped bevel gear 271 is located above the first mounting seat 273. The sector-shaped bevel gear 271 alternately meshes with the two first bevel gears 27. Figure 3 As shown, when the sector bevel gear 271 meshes with one of the first bevel gears 27, the sector bevel gear 271 can drive the discharge frame 25 to swing clockwise around the swing horizontal axis 26 by the first bevel gear 27, the swing horizontal axis 26, and the material-releasing inner cylinder 24. Similarly, when the sector bevel gear 271 meshes with the other first bevel gear 27, the sector bevel gear 271 can drive the discharge frame 25 to swing counterclockwise around the swing horizontal axis 26 by the first bevel gear 27, the swing horizontal axis 26, and the material-releasing inner cylinder 24. Therefore, by alternately meshing with the two first bevel gears 27, the sector bevel gear 271 can drive the discharge frame 25 to swing back and forth around the swing horizontal axis 26 by a certain angle to distribute the material.

[0027] A second bevel gear 28 is provided on the first longitudinal shaft 272 on the lower side of the first mounting base 273. The second bevel gear 28 meshes with two third bevel gears 281, and the two third bevel gears 281 are distributed on both sides of the second bevel gear 28. The two third bevel gears 281 are correspondingly mounted on two first transverse shafts 282. The two first transverse shafts 282 are rotatably mounted on the outer wall of the material buffer frame 21 via the second mounting base 283. A first motor 284 is provided on the second mounting base 283, and the output shaft of the first motor 284 is connected to the corresponding first transverse shaft 282. In use, the two first motors 284 operate synchronously, driving the second bevel gear 28 to rotate via the first transverse shaft 282 and the third bevel gears 281, respectively. The second bevel gear 28 drives the first longitudinal shaft 272 and the sector bevel gears 271 mounted on the first longitudinal shaft 272 to rotate. Two first motors 284 are used to drive the second bevel gear 28 and the first longitudinal shaft 272 to rotate in order to ensure sufficient torque; of course, only one first motor 284 can be used to drive the second bevel gear 28 and the first longitudinal shaft 272 to rotate.

[0028] The precooling mechanism 3 includes a precooling outer frame 31, within which a cooling component 33 is installed. The precooling outer frame 31 is fixed to the machine frame, and its upper end is connected to the lower end of the material handling mechanism 2. The lower end of the precooling outer frame 31 has a material gathering frame 311 whose shape and size gradually decrease from top to bottom. A discharge pipe 32 is located at the bottom of the material gathering frame 311, and the discharge pipe 32 is connected to the upper end of the guide pipe 5. In use, the upper end of the precooling outer frame 31 is connected to the lower end of the material holding frame 21. Fine aggregate requiring precooling enters from the upper end of the precooling outer frame 31 and is cooled by the cooling component 33. The cooled fine aggregate falls into the material gathering frame 311 and then enters the cooling mechanism 4 via the discharge pipe 32 and the guide pipe 5.

[0029] The cooling assembly 33 includes multiple hollow material-separating longitudinal frames 331 arranged side-by-side and fixedly connected to the pre-cooling outer frame 31. The hollow material-separating longitudinal frames 331 are arranged vertically and parallel to the plane determined by the swing trajectory of the material-laying mechanism 2. A material-loosening protrusion 332 is integrally formed on the top of each hollow material-separating longitudinal frame 331. The cross-sectional shape of the material-loosening protrusion 332 is an isosceles trapezoid, with the upper base facing upwards. All the hollow material-separating longitudinal frames 331 are connected and interconnected through multiple parallel-arranged connecting pipes 333. The cooling assembly 33 includes multiple hollow material-separating longitudinal frames 331 arranged side-by-side, forming a fine aggregate pre-cooling channel between each pair of adjacent hollow material-separating longitudinal frames 331. This creates multiple pre-cooling channels between the multiple hollow material-separating longitudinal frames 331, which helps to increase the contact area between the fine aggregate and the cooling assembly 33, improving the cooling effect and efficiency of the cooling assembly 33 on the fine aggregate. The hollow spacer frame 331 is parallel to the plane determined by the swing trajectory of the material handling mechanism 2, which helps to disperse the fine aggregate placed in the pre-cooling outer frame 31 by the discharge frame 25 into a sufficient number of pre-cooling channels, thereby further improving the cooling effect and efficiency of the cooling component 33 on the fine aggregate. The top of the hollow spacer frame 331 is integrally formed with a material distribution protrusion 332, the cross-sectional shape of which is an isosceles trapezoid, facilitating the introduction of fine aggregate into the pre-cooling channels through the material distribution protrusion 332. All the internal cavities of the hollow spacer frame 331 are connected by multiple connecting pipes 333.

[0030] The hollow partition frame 331 located at one end of the cooling assembly 33 has multiple liquid inlet bottom pipes 334 at the bottom and multiple liquid outlet top pipes 335 at the top. The multiple liquid inlet bottom pipes 334 and the multiple liquid outlet top pipes 335 all penetrate one side wall of the precooling outer frame 31 and are respectively connected to the interior of the cooling assembly 33. The precooling outer frame 31 is equipped with an inlet main pipe 34 and an outlet main pipe 35. The inlet main pipe 34 is connected to multiple inlet bottom pipes 334 through inlet branch pipes 341, and the outlet main pipe 35 is connected to multiple outlet top pipes 335 through outlet branch pipes 351. In use, after the coolant enters the inlet main pipe 34, it flows into the multiple inlet bottom pipes 334 through the multiple inlet branch pipes 341, then enters the bottom of the hollow partition frame 331, and gradually flows upward to the top of the hollow partition frame 331. Then it flows into the multiple outlet branch pipes 351 through the multiple outlet top pipes 335, and then collects in the outlet main pipe 35 for discharge, and finally is discharged into the external coolant recovery system. Fine aggregate is discharged into the pre-cooling outer frame 31 via the reciprocating oscillating discharge frame 25, and then fed into multiple pre-cooling channels by the dispersing action of the loose material convex frame 332, before slowly falling into the aggregate collection frame 311. The fine aggregate fed into the multiple pre-cooling channels is effectively pre-cooled by the coolant. The coolant flows from bottom to top in the hollow material-separating longitudinal frame 331, while the fine aggregate flows from top to bottom in the pre-cooling channels. This facilitates sufficient indirect contact between the coolant and the fine aggregate, pre-cooling and lowering the temperature of the fine aggregate, further improving the cooling effect and efficiency of the coolant on the fine aggregate.

[0031] The cooling mechanism 4 includes a guide cylinder 41, which is fixedly mounted on the frame. A feed longitudinal pipe 42 is located at the top of one end of the guide cylinder 41 and is connected to the lower end of the guide pipe 5. A discharge longitudinal pipe 43 is located at the bottom of the guide cylinder 41 at the end away from the feed longitudinal pipe 42. An auger shaft 44 is coaxially rotatably mounted on the guide cylinder 41. The auger shaft 44 has helical blades 45, which are hollow to form a cavity 451 inside. Both ends of the auger shaft 44 are... A liquid guiding blind hole 441 is coaxially provided. Both ends of the auger horizontal shaft 44 are provided with a liquid guiding pipe 452 in the radial direction, which connects the liquid guiding blind hole 441 and the cavity 451. The end of the auger horizontal shaft 44 near the discharge vertical pipe 43 is connected to the liquid inlet pipe 46 through a rotary joint 442. The liquid inlet pipe 46 is fixedly installed on the guide horizontal cylinder 41 through a first fixing bracket 461. The end of the auger horizontal shaft 44 near the feed vertical pipe 42 is connected to the liquid outlet pipe 47 through a rotary joint 442. The liquid outlet pipe 47 is fixedly installed on the guide horizontal cylinder 41 through a second fixing bracket 471. During operation, the coolant enters the blind guide hole 441 at one end of the auger horizontal shaft 44 through the inlet pipe 46, then enters the cavity 451 through the guide pipe 452, and flows from one end of the spiral blade 45 to the other end within the cavity 451. Next, it enters the blind guide hole 441 at the other end of the auger horizontal shaft 44 through another guide pipe 452, and then flows into the outlet pipe 47. Within the spiral blade 45, the coolant flows from the end near the discharge longitudinal pipe 43 to the end near the feed longitudinal pipe 42, while the fine aggregate flows from the end near the feed longitudinal pipe 42 to the end near the discharge longitudinal pipe 43 within the guide cylinder 41. This facilitates sufficient indirect contact between the coolant and the fine aggregate, pre-cooling and lowering the temperature of the fine aggregate, further improving the cooling effect and efficiency of the coolant on the fine aggregate.

[0032] A crown gear 48 is provided at one end of the auger horizontal shaft 44 near the drain pipe 47. A third gear 483 is meshed on the crown gear 48. The third gear 483 is located on the second vertical shaft 482, which is rotatably mounted on the guide cylinder 41 via a third mounting base 481. By controlling the rotation of the second vertical shaft 482, the second vertical shaft 482 can drive the crown gear 48 and the auger horizontal shaft 44 to rotate via the third gear 483. As the spiral blades 45 rotate with the auger horizontal shaft 44, they transport the fine aggregate from the feed vertical pipe 42 to the discharge vertical pipe 43.

[0033] It also includes a common drive shaft 61 and a connecting conduit 7. The common drive shaft 61 is rotatably mounted on the precooling mechanism 3 via two fourth mounting seats 6. The upper end of the common drive shaft 61 is connected to the lower end of the first longitudinal shaft 272, and the lower end is connected to the upper end of the second longitudinal shaft 482. The lower end of the connecting conduit 7 is connected to the drain pipe 47, and the upper end is connected to the main inlet pipe 34. The first longitudinal shaft 272 and the second longitudinal shaft 482 are connected by a common drive shaft 61, allowing the material handling mechanism 2 and the cooling mechanism 4 to share a single drive system (i.e., sharing two first motors 284), simplifying the device structure. The connecting conduit 7 connects the drain pipe 47 to the main inlet pipe 34, allowing the coolant to exchange heat with the fine aggregate in the cooling mechanism 4, and then guide it through the connecting conduit 7 into the pre-cooling mechanism 3 for further heat exchange with the fine aggregate.

[0034] The working principle of the concrete production fine aggregate precooling device of the present invention is as follows: Coolant is injected from the inlet pipe 46 into the liquid guide blind hole 441 at one end of the auger horizontal shaft 44. Then, the coolant enters the cavity 451 through the liquid guide pipe 452, and flows from one end of the spiral blade 45 to the other end within the cavity 451. It then enters the liquid guide blind hole 441 at the other end of the auger horizontal shaft 44 through another liquid guide pipe 452, and then flows into the drain pipe 47. Next, the coolant is guided through the drain pipe 47, connecting conduit 7, main inlet pipe 34, multiple inlet branch pipes 341, and multiple bottom inlet pipes 334 to the bottom of multiple hollow partition frames 331, and gradually flows upward to the top of the hollow partition frames 331. Subsequently, it flows into multiple outlet branch pipes 351 through multiple top outlet pipes 335, and then converges into the main outlet pipe 35 for unified discharge, finally being discharged into the external coolant recovery system.

[0035] Before pouring fine aggregate into the feed frame 23, the two first motors 284 are started. The two first motors 284 operate synchronously, driving the second bevel gear 28 to rotate through the first horizontal shaft 282 and the third bevel gear 281, respectively. The second bevel gear 28 drives the first vertical shaft 272 and the sector bevel gear 271 mounted on the first vertical shaft 272 to rotate. When the sector bevel gear 271 meshes with one of the first bevel gears 27, the sector bevel gear 271 rotates through the first bevel gear 27 and the swing horizontal shaft 26. The inner cylinder 24 of the slowing material drives the discharge frame 25 to swing clockwise around the horizontal axis 26 at a certain angle; similarly, when the sector bevel gear 271 meshes with another first bevel gear 27, the sector bevel gear 271 drives the discharge frame 25 to swing counterclockwise around the horizontal axis 26 at a certain angle through the first bevel gear 27, the horizontal axis 26 and the inner cylinder 24 of the slowing material; therefore, the sector bevel gear 271 can drive the discharge frame 25 to swing back and forth around the horizontal axis 26 at a certain angle by alternately meshing with the two first bevel gears 27.

[0036] The fine aggregate that needs to be pre-cooled is put into the feed frame 23, and then the fine aggregate enters the slowing inner cylinder 24 through the feed port 241. Under the action of the reciprocating oscillating discharge frame 25, the material is distributed to the top of the pre-cooling mechanism 3 to prevent the accumulation of fine aggregate during subsequent pre-cooling and affect the pre-cooling efficiency.

[0037] The cooling component 33 of the pre-cooling mechanism 3 includes multiple hollow spacer frames 331 arranged side by side, forming a fine aggregate pre-cooling channel between each pair of adjacent hollow spacer frames 331. This creates multiple pre-cooling channels between the hollow spacer frames 331. As the fine aggregate slowly flows from top to bottom through these channels, it comes into full contact with the hollow spacer frames 331, exchanging heat with the coolant flowing from bottom to top within the frames, thus achieving initial cooling and temperature reduction of the fine aggregate. The fine aggregate then falls into the aggregate frame 311 and then enters the guide cylinder 41 via the guide pipe 5 and the feed pipe.

[0038] While the first longitudinal shaft 272 rotates, it transmits torque to the second longitudinal shaft 482 through the common drive shaft 61. The second longitudinal shaft 482 drives the auger horizontal shaft 44 to rotate through the third gear 483 and the crown gear 48. As the spiral blades 45 rotate with the auger horizontal shaft 44, they transport the fine aggregate from the feed longitudinal pipe 42 to the discharge longitudinal pipe 43. During this process, the fine aggregate comes into full contact with the surface of the spiral blades 45 and exchanges heat with the coolant inside the spiral blades 45, achieving secondary cooling and temperature reduction of the fine aggregate, further improving the cooling and temperature reduction effect of the fine aggregate.

Claims

1. A concrete production fine aggregate pre-cooling device, characterized by: The utility model provides a kind of material distributing mechanism, which comprises a rack, and is provided with material distributing mechanism (2), precooling mechanism (3) and guide cooling mechanism (4) on the rack, the precooling mechanism (3) is located at the downside of material distributing mechanism (2), and the top of precooling mechanism (3) is communicated with the bottom of material distributing mechanism (2), the guide cooling mechanism (4) is located below precooling mechanism (3), and the guide cooling mechanism (4) is communicated with the bottom of precooling mechanism (3) by guide pipe (5).

2. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 1, wherein: The material distributing mechanism (2) comprises a material buffering bottom frame (21), the top of the material buffering bottom frame (21) is integrally formed with a rotating outer cylinder (22), the top of the rotating outer cylinder (22) is integrally formed with a feeding frame (23), the rotating outer cylinder (22) is provided with a material buffering inner cylinder (24) therein, the bottom of the material buffering inner cylinder (24) is integrally formed with a discharging frame (25), and the discharging frame (25) is communicated with the material buffering inner cylinder (24), the top of the material buffering inner cylinder (24) is provided with a feeding port (241), and both ends of the material buffering inner cylinder (24) are provided with swing horizontal shafts (26), and the swing horizontal shafts (26) at both ends of the material buffering inner cylinder (24) are respectively rotationally connected with the rotating outer cylinder (22).

3. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 2, wherein: The swing horizontal shaft (26) at one end of the material buffering inner cylinder (24) extends out of the rotating outer cylinder (22), two first bevel gears (27) are symmetrically mounted on the swing horizontal shaft (26), and the small end faces of the two first bevel gears (27) are arranged face to face, the outer wall of the material buffering bottom frame (21) is provided with a first mounting seat (273), the first mounting seat (273) is rotationally connected with a first vertical shaft (272), a sector bevel gear (271) is arranged on the first vertical shaft (272) below the two first bevel gears (27), and the sector bevel gear (271) is located above the first mounting seat (273), and the sector bevel gear (271) is alternately meshed with the two first bevel gears (27).

4. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 3, wherein: A second bevel gear (28) is arranged on the first vertical shaft (272) below the first mounting seat (273), the second bevel gear (28) is meshed with two third bevel gears (281), and the two third bevel gears (281) are arranged on both sides of the second bevel gear (28), the two third bevel gears (281) are correspondingly arranged on two first horizontal shafts (282), and the two first horizontal shafts (282) are rotationally installed on the outer wall of the material buffering bottom frame (21) through a second mounting seat (283), the second mounting seat (283) is provided with a first motor (284), and the output shaft of the first motor (284) is connected with the corresponding first horizontal shaft (282).

5. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 1, wherein: The pre-cooling mechanism (3) comprises a pre-cooling outer frame (31) provided with a cooling assembly (33) inside, the pre-cooling outer frame (31) is fixed on the rack, and the upper end of the pre-cooling outer frame (31) is communicated with the lower end of the material placing mechanism (2), the lower end of the pre-cooling outer frame (31) is provided with a material gathering frame (311) which is tapered from top to bottom in shape and size, the bottom of the material gathering frame (311) is provided with a discharge pipe (32), and the discharge pipe (32) is connected with the upper end of the material guide pipe (5).

6. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 5, wherein: The cooling assembly (33) comprises a plurality of hollow material separating longitudinal frames (331) arranged side by side and fixedly connected with the pre-cooling outer frame (31), the hollow material separating longitudinal frames (331) are arranged in the vertical direction and parallel to the plane determined by the swinging track of the material placing mechanism (2), the top of the hollow material separating longitudinal frame (331) is integrally provided with a material scattering convex frame (332), the cross-sectional shape of the material scattering convex frame (332) is isosceles trapezoidal, and the upper base of the isosceles trapezoid faces upward, and all the hollow material separating longitudinal frames (331) are connected and communicated by a plurality of communication pipes (333) arranged side by side.

7. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 6, wherein: The lower part of the hollow material separating longitudinal frame (331) located at one end of the cooling assembly (33) is provided with a plurality of liquid inlet bottom pipes (334), and the upper part is provided with a plurality of liquid outlet top pipes (335), the plurality of liquid inlet bottom pipes (334) and the plurality of liquid outlet top pipes (335) all penetrate one side wall of the pre-cooling outer frame (31) and are respectively communicated with the inside of the cooling assembly (33); The pre-cooling outer frame (31) is provided with a liquid inlet main pipe (34) and a liquid outlet main pipe (35) outside, the liquid inlet main pipe (34) is communicated with the plurality of liquid inlet bottom pipes (334) one by one through liquid inlet branch pipes (341), and the liquid outlet main pipe (35) is communicated with the plurality of liquid outlet top pipes (335) one by one through liquid outlet branch pipes (351).

8. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 1, wherein: The cold conducting mechanism (4) comprises a material guiding horizontal cylinder (41) fixedly installed on a rack, a top of one end of the material guiding horizontal cylinder (41) is provided with an inlet longitudinal pipe (42), the inlet longitudinal pipe (42) is connected with a lower end of the material guiding pipe (5), a bottom of an end of the material guiding horizontal cylinder (41) away from the inlet longitudinal pipe (42) is provided with an outlet longitudinal pipe (43), a horizontal screw shaft (44) is coaxially arranged on the material guiding horizontal cylinder (41), the horizontal screw shaft (44) is provided with a spiral blade (45), the spiral blade (45) is a hollow structure to form a cavity (451) in the spiral blade (45), a liquid guiding blind hole (441) is coaxially arranged on both ends of the horizontal screw shaft (44), a liquid guiding pipe (452) is radially arranged on both ends of the horizontal screw shaft (44) to connect the liquid guiding blind hole (441) and the cavity (451), a liquid inlet pipe (46) is connected with one end of the horizontal screw shaft (44) close to the outlet longitudinal pipe (43) through a rotary joint (442), the liquid inlet pipe (46) is fixedly installed on the material guiding horizontal cylinder (41) through a first fixing frame (461), a liquid outlet pipe (47) is connected with one end of the horizontal screw shaft (44) close to the inlet longitudinal pipe (42) through a rotary joint (442), and the liquid outlet pipe (47) is fixedly installed on the material guiding horizontal cylinder (41) through a second fixing frame (471).

9. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 8, wherein: One end of the horizontal screw shaft (44) close to the liquid outlet pipe (47) is provided with a crown gear (48), the crown gear (48) is meshingly connected with a third gear (483), the third gear (483) is arranged on a second longitudinal shaft (482), and the second longitudinal shaft (482) is rotatably installed on the material guiding horizontal cylinder (41) through a third mounting base (481).

10. The concrete production fine aggregate pre-cooling apparatus as claimed in claim 1, wherein: The precooling mechanism (3) is further provided with a common driving shaft (61) and a communication conduit (7), the common driving shaft (61) is rotatably arranged on the precooling mechanism (3) through two fourth mounting bases (6), an upper end of the common driving shaft (61) is connected with a lower end of the first longitudinal shaft (272), and a lower end of the common driving shaft (61) is connected with an upper end of the second longitudinal shaft (482). The lower end of the communication conduit (7) is communicated with the liquid outlet pipe (47), and the upper end of the communication conduit (7) is communicated with the liquid inlet main pipe (34).

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