RAP material refining and grading equipment

Abstract

The utility model discloses RAP material refining and grading equipment which comprises a feeding port, a primary screening and crushing system, a screening and grading system, a discharging and conveying system, a support, a base and a shell. The primary screening and crushing system comprises a primary screen, a crushed material conveying belt, a primary conveying belt, a spiral elevator and a crusher; the screening and grading system comprises a first-stage screen, a second-stage screen, a third-stage screen, a sliding groove and a vibration motor. The discharging conveying system comprises a first-stage conveying belt, a second-stage conveying belt, a third-stage conveying belt, an asphaltic sand conveying belt, a first-stage discharging port, a second-stage discharging port, a third-stage discharging port and an asphaltic sand discharging port. According to the utility model, various processes of crushing, screening and grading of the RAP are integrated on one device, so that the integrated design is realized, the occupied area of the device is small, all components of the RAP material are utilized, the RAP material is utilized in a high-quality manner, the grading determination of the RAP material is accurate, the efficiency and the accuracy of refining and recycling the RAP material are improved, and the consistency of a laboratory mix proportion and a production mix proportion is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of aggregate screening, and specifically relates to a RAP material refinement and grading device. Background Technique

[0002] RAP (Reclaimed Asphalt Pavement, recycled asphalt mixture, GB / T 37383-2019) is an engineering waste generated during the milling and crushing construction of asphalt pavements. Its main components are aggregates and aged asphalt. Recycling RAP materials to mix asphalt mixtures can save a large amount of mine resources and achieve the efficient circular utilization of aggregate resources. The premise of high-quality utilization of RAP materials is to refine and grade them according to the gradation. Since the RAP materials come from different layers during the milling of asphalt pavements, there are a large number of aggregates with different particle sizes in the RAP materials, and the gradation variation is large. At the same time, there are a large number of oversized lumps and agglomerates formed by the adhesion of aged asphalt and aggregates in the RAP materials, which also cause large fluctuations in the gradation.

[0003] In the current RAP recycling, to ensure the performance and quality of the recycled mixture, the large lumps and agglomerates in the RAP materials are usually removed, and only the unagglomerated components are screened to determine the mixing ratio. This not only causes a large amount of waste of waste aggregates and asphalt, but also reduces the accuracy of the gradation determination of RAP materials, thus affecting the mix design and performance level of RAP recycled mixtures. These problems existing in the RAP recycling process often result in poor accuracy of the mix design of the recycled mixture, and it is difficult for the laboratory mix ratio formed to match the production mix ratio of the mixing plant, resulting in large variability in the mechanical properties of RAP recycled asphalt mixtures and being unfavorable for the reuse of RAP materials.

[0004] The key to solving the above problems is to perform processes such as gradation crushing, screening, and grading before the RAP recycling application to achieve fine grading of the RAP gradation and ensure that the RAP materials used in the indoor test mix design are the same as the raw materials used in the mixing plant. That is, a device is needed that can break and screen the oversized lumps formed by the adhesion of asphalt in the RAP materials and then reuse them according to the grading. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a RAP material refinement and grading device.

[0006] The technical solution adopted by the utility model to solve the above technical problem is to provide a RAP material refinement and grading device, which is characterized in that the device includes a feed inlet, a primary screening and crushing system, a screening and grading system, a discharge conveying system, a support, a base, and a housing;

[0007] The primary screening and crushing system includes a primary screen, a crushed material conveyor belt, a primary conveyor belt, a screw elevator, and a crusher; the screening and grading system includes a first-stage screen, a second-stage screen, a third-stage screen, a chute, and a vibrating motor; the discharging and conveying system includes a first-stage conveyor belt, a second-stage conveyor belt, a third-stage conveyor belt, an asphalt sand conveyor belt, a first-stage discharging port, a second-stage discharging port, a third-stage discharging port, and an asphalt sand discharging port;

[0008] The housing is installed on the base through brackets; four inclined chutes are provided on the inner wall of the housing in a layered manner; the primary screen, the first-stage screen, the second-stage screen, and the third-stage screen are sequentially arranged in their respective chutes in the order from top to bottom, and the input ends of all the screens are higher than their output ends; the vibrating motor is fixed on the housing;

[0009] The crushed material conveyor belt, the primary conveyor belt, the first-stage conveyor belt, the second-stage conveyor belt, the third-stage conveyor belt, and the asphalt sand conveyor belt are sequentially arranged inside the housing in the order from top to bottom;

[0010] A feed inlet is provided at the top of the housing; the end of the feed inlet is connected to the input end of the primary screen; the output end of the primary screen is connected to the input end of the primary conveyor belt; the output end of the primary conveyor belt is connected to the input end of the screw elevator; the output end of the screw elevator is connected to the inlet of the crusher; the outlet of the crusher is connected to the input end of the crushed material conveyor belt; the output end of the crushed material conveyor belt is directly above the primary screen;

[0011] The output end of the first-stage screen is connected to the input end of the first-stage conveyor belt; a first-stage discharging port is provided at the output end of the first-stage conveyor belt; the output end of the second-stage screen is connected to the input end of the second-stage conveyor belt; a second-stage discharging port is provided at the output end of the second-stage conveyor belt; the output end of the third-stage screen is connected to the input end of the third-stage conveyor belt; a third-stage discharging port is provided at the output end of the third-stage conveyor belt; the asphalt sand conveyor belt is directly below the third-stage screen, and an asphalt sand discharging port is provided at the output end.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] (1) The present utility model integrates multiple processes such as crushing, screening, and grading of RAP into one device, realizing an integrated design. The device occupies a small area, utilizes all components of the RAP material, highly utilizes the RAP material, accurately measures the gradation of the RAP material, improves the efficiency and accuracy of RAP refinement and recovery, and ensures the consistency of the laboratory mix ratio and the production mix ratio.

[0014] (2) The crusher of the present utility model adopts a counterattack crushing structure, which can break up the agglomerated and lumped components in the RAP material, improve the quality of the RAP material, is conducive to the mixing of the RAP material and the new asphalt, and ensures that the gradation of the recycled mixture matches the actual situation.

[0015] (3) The utility model utilizes the working process of screening first and then crushing to minimize the energy consumption of the equipment and save fuel resources.

[0016] (4) The utility model realizes the screening of RAP through the up-and-down vibration of the vibration motor and different-aperture sieves, divides the RAP into four grades, and the RAP components of different grades are screened out through different discharge ports, realizing the efficient screening of RAP materials, which is beneficial to the distinction of RAP with different particle sizes, improves the quality of the recycled mixture, and is more conducive to the RAP mix ratio and subsequent tests in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is a schematic diagram of the working process of the screw elevator and crusher of the utility model.

[0019] In the figure, the feed inlet 1, primary sieve 2, first-stage sieve 3, second-stage sieve 4, third-stage sieve 5, crushed material conveyor belt 6, primary conveyor belt 7, first-stage conveyor belt 8, second-stage conveyor belt 9, third-stage conveyor belt 10, asphalt sand conveyor belt 11, chute 12, elevator main shaft 13, elevator conveying pipe 14, elevator conveyor belt 15, crusher rotating shaft 16, crusher hammer head 17, crusher counterattack plate 18, baffle 19, vibration motor 20, support 21, shock-absorbing spring 22, first-stage discharge port 23, second-stage discharge port 24, third-stage discharge port 25, asphalt sand discharge port 26, base 27, and housing 28. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following gives specific embodiments of the utility model. The specific embodiments are only used to further elaborate the utility model in detail and do not limit the protection scope of the utility model.

[0021] The utility model provides a device for refining and grading RAP materials (hereinafter referred to as the device), which is characterized in that the device includes a feed inlet 1, a primary screening and crushing system, a screening and grading system, a discharge and conveying system, a support 21, a base 27, and a housing 28;

[0022] The primary screening and crushing system includes a primary sieve 2, a crushed material conveyor belt 6, a primary conveyor belt 7, a screw elevator, and a crusher; the screening and grading system includes a first-stage sieve 3, a second-stage sieve 4, a third-stage sieve 5, a chute 12, and a vibration motor 20; the discharge and conveying system includes a first-stage conveyor belt 8, a second-stage conveyor belt 9, a third-stage conveyor belt 10, an asphalt sand conveyor belt 11, a first-stage discharge port 23, a second-stage discharge port 24, a third-stage discharge port 25, and an asphalt sand discharge port 26;

[0023] The housing 28 is mounted on the base 27 through the support 21; four inclined chutes 12 are provided on the inner wall of the housing 28 in a layered manner; the primary screen 2, the first-stage screen 3, the second-stage screen 4, and the third-stage screen 5 are sequentially arranged in their respective chutes 12 in the order from top to bottom. The primary screen 2 is located at the topmost layer, and the third-stage screen 5 is located at the bottommost layer. The input ends of all the screens are higher than their output ends; the vibration motor 20 is fixed on the housing 28, and the force generated by the vibration of the vibration motor 20 is transmitted to the primary screen 2, the first-stage screen 3, the second-stage screen 4, and the third-stage screen 5 through the housing 28. The screens vibrate up and down to achieve RAP screening, and the RAP is divided into four grades, which is more conducive to the laboratory to carry out RAP mix ratio and subsequent tests;

[0024] The crushed material conveyor belt 6, the primary conveyor belt 7, the first-stage conveyor belt 8, the second-stage conveyor belt 9, the third-stage conveyor belt 10, and the asphalt sand conveyor belt 11 are sequentially arranged inside the housing 28 in the order from top to bottom. The crushed material conveyor belt 6 is located at the topmost layer, and the asphalt sand conveyor belt 11 is located at the bottommost layer;

[0025] The top of the housing 28 is provided with a feed inlet 1; the end of the feed inlet 1 is connected to the input end of the primary screen 2; the output end of the primary screen 2 is connected to the input end of the primary conveyor belt 7; the output end of the primary conveyor belt 7 is connected to the input end of the screw elevator; the output end of the screw elevator is connected to the inlet of the crusher; the outlet of the crusher is connected to the input end of the crushed material conveyor belt 6; the output end of the crushed material conveyor belt 6 is directly above the primary screen 2;

[0026] The output end of the first-stage screen 3 is connected to the input end of the first-stage conveyor belt 8; a first-stage discharge port 23 is provided at the output end of the first-stage conveyor belt 8; the output end of the second-stage screen 4 is connected to the input end of the second-stage conveyor belt 9; a second-stage discharge port 24 is provided at the output end of the second-stage conveyor belt 9; the output end of the third-stage screen 5 is connected to the input end of the third-stage conveyor belt 10; a third-stage discharge port 25 is provided at the output end of the third-stage conveyor belt 10; the asphalt sand conveyor belt 11 is directly below the third-stage screen 5, and an asphalt sand discharge port 26 is provided at the output end.

[0027] Preferably, the equipment further includes shock-absorbing springs 22; the support 21 is mounted on the base 27 through the shock-absorbing springs 22, and the vibration influence of the vibration motor 20 is reduced through the shock-absorbing springs 22, and the loss of the equipment caused by the vibration of the vibration motor 20 is reduced.

[0028] Preferably, the spiral elevator includes an elevator main shaft 13, an elevator conveying pipe 14, and an elevator conveyor belt 15; the elevator main shaft 13 is fixed inside the housing 28; the elevator conveying pipe 14 is fixed to the elevator main shaft 13 in a spiral ascending form; the elevator conveyor belt 15 is arranged inside the elevator conveying pipe 14 to drive the agglomerated RAP for conveying and lifting; the output end of the primary conveyor belt 7 is connected to the input end of the elevator conveyor belt 15; the output end of the elevator conveyor belt 15 is connected to the inlet of the crusher.

[0029] Preferably, the crusher includes a crusher rotating shaft 16, crusher hammers 17, a crusher counterattack plate 18, and a baffle 19; the crusher hammers 17 are rotatably installed inside the housing 28 through the crusher rotating shaft 16; the crusher counterattack plate 18 is fixed inside the housing 28; according to the rotation direction of the crusher hammers 17, the crusher counterattack plate 18 is located at the first station behind the inlet of the crusher; the baffle 19 is fixed inside the housing 28; according to the rotation direction of the crusher hammers 17, the baffle 19 is located at the first station behind the outlet of the crusher to prevent the RAP material from splashing due to the drive of the crusher hammers 17.

[0030] Preferably, two vibration motors 20 are symmetrically fixed inside the housing 28 and are symmetrically arranged on both sides of all the sieves.

[0031] Preferably, the baffle 19, the bracket 21, the base 27, and the housing 28 are all made of steel to improve the overall strength of the lifting equipment.

[0032] Preferably, the screening apertures of the primary sieve 2, the first-stage sieve 3, the second-stage sieve 4, and the third-stage sieve 5 can be flexibly replaced according to the grading requirements.

[0033] The working principle and working process of the present utility model are as follows:

[0034] RAP material enters the equipment from the feed inlet 1. The vibration motor 20 starts, and the primary screen 2 is used for primary vibration screening. Among them, the agglomerated components cannot pass through the primary screen 2 due to their larger particle size, and then move to the primary conveyor belt 7 along with the vibration of the primary screen 2, and are transported to the input end of the elevator conveying pipe 14 through the primary conveyor belt 7. Along with the gradual lifting of the elevator conveyor belt 15, the agglomerated components are transported above the crusher rotating shaft 16 and fall by gravity onto the crusher hammer head 17. The crusher rotating shaft 16 drives the crusher hammer head 17 to rotate, driving the agglomerated components to fly onto the crusher counterattack plate 18. The agglomerated components are broken through the repeated impacts of the crusher hammer head 17 and the crusher counterattack plate 18. The crushed RAP falls onto the crushed material conveyor belt 6 by gravity and is transported to the primary screen 2 through the crushed material conveyor belt 6 for vibration screening. After being crushed by the crusher, most of the agglomerated components can pass through the primary screen 2 for subsequent classification screening. If the crushing is not successful, the above process is repeated until the agglomerated components are broken and successfully pass through the primary screen 2;

[0035] When the remaining non-agglomerated RAP passes through the primary screen 2, the force generated by the vibration of the vibration motor 20 is transmitted to the first-stage screen 3, the second-stage screen 4, and the third-stage screen 5. The vibrating screens screen the RAP with different particle sizes respectively, and divide the RAP into four grades, namely the first-stage RAP component, the second-stage RAP component, the third-stage RAP component, and the relatively fine asphalt sand. The RAP components of different grades are respectively transported to the first-stage discharge port 23, the second-stage discharge port 24, the third-stage discharge port 25, and the asphalt sand discharge port 26 through the first-stage conveyor belt 8, the second-stage conveyor belt 9, the third-stage conveyor belt 10, and the asphalt sand conveyor belt 11, completing the RAP screening and grading. The RAP components of the first, second, and third grades can be flexibly designed for the mix ratio in the laboratory according to the actual engineering application. The relatively small asphalt sand contains a large amount of aged asphalt, which can be used for subsequent aged asphalt performance testing, regeneration tests and other processes.

[0036] The parts not described in this utility model are applicable to the prior art.

Claims

1. A RAP material refinement and grading device, characterized in that, The device includes a feed inlet (1), a primary screening and crushing system, a screening and grading system, a discharge conveying system, a support (21), a base (27) and a housing (28); The primary screening and crushing system includes a primary screen (2), a crushed material conveyor belt (6), a primary conveyor belt (7), a screw elevator and a crusher; the screening and grading system includes a first-stage screen (3), a second-stage screen (4), a third-stage screen (5), a chute (12) and a vibration motor (20); the discharge conveying system includes a first-stage conveyor belt (8), a second-stage conveyor belt (9), a third-stage conveyor belt (10), an asphalt sand conveyor belt (11), a first-stage discharge outlet (23), a second-stage discharge outlet (24), a third-stage discharge outlet (25) and an asphalt sand discharge outlet (26); The housing (28) is installed on the base (27) through the support (21); four inclined chutes (12) are provided on the inner wall of the housing (28) in a layered manner; the primary screen (2), the first-stage screen (3), the second-stage screen (4), and the third-stage screen (5) are sequentially arranged in their respective chutes (12) in the order from top to bottom, and the input ends of all the screens are higher than their output ends; the vibration motor (20) is fixed on the housing (28); The crushed material conveyor belt (6), the primary conveyor belt (7), the first-stage conveyor belt (8), the second-stage conveyor belt (9), the third-stage conveyor belt (10) and the asphalt sand conveyor belt (11) are sequentially arranged inside the housing (28) in the order from top to bottom; A feed inlet (1) is provided at the top of the housing (28); the end of the feed inlet (1) is connected to the input end of the primary screen (2); the output end of the primary screen (2) is connected to the input end of the primary conveyor belt (7); the output end of the primary conveyor belt (7) is connected to the input end of the screw elevator; the output end of the screw elevator is connected to the inlet of the crusher; the outlet of the crusher is connected to the input end of the crushed material conveyor belt (6); the output end of the crushed material conveyor belt (6) is located directly above the primary screen (2); The output end of the first-stage screen (3) is connected to the input end of the first-stage conveyor belt (8); a first-stage discharge outlet (23) is provided at the output end of the first-stage conveyor belt (8); the output end of the second-stage screen (4) is connected to the input end of the second-stage conveyor belt (9); a second-stage discharge outlet (24) is provided at the output end of the second-stage conveyor belt (9); the output end of the third-stage screen (5) is connected to the input end of the third-stage conveyor belt (10); a third-stage discharge outlet (25) is provided at the output end of the third-stage conveyor belt (10); the asphalt sand conveyor belt (11) is located directly below the third-stage screen (5), and an asphalt sand discharge outlet (26) is provided at the output end.

2. The RAP material refinement and classification device according to claim 1, wherein The device further includes shock-absorbing springs (22); the support (21) is installed on the base (27) through the shock-absorbing springs (22) to reduce the vibration influence of the vibration motor (20).

3. The RAP material refinement and classification equipment according to claim 1, characterized in that The spiral elevator includes an elevator main shaft (13), an elevator conveying pipe (14) and an elevator conveyor belt (15); the elevator main shaft (13) is fixed inside the housing (28); the elevator conveying pipe (14) is fixed on the elevator main shaft (13); the elevator conveyor belt (15) is arranged inside the elevator conveying pipe (14); the output end of the primary conveyor belt (7) is connected to the input end of the elevator conveyor belt (15); the output end of the elevator conveyor belt (15) is connected to the inlet of the crusher.

4. The RAP material refinement and classification equipment according to claim 1, characterized in that, The crusher includes a crusher rotating shaft (16), crusher hammers (17), a crusher counterattack plate (18) and a baffle (19); the crusher hammers (17) are rotatably installed inside the housing (28) through the crusher rotating shaft (16); the crusher counterattack plate (18) is fixed inside the housing (28); according to the rotation direction of the crusher hammers (17), the crusher counterattack plate (18) is located at the first working station behind the inlet of the crusher; the baffle (19) is fixed inside the housing (28); according to the rotation direction of the crusher hammers (17), the baffle (19) is located at the first working station behind the outlet of the crusher to prevent the RAP material from splashing due to the drive of the crusher hammers (17).

5. The RAP material refinement and classification equipment according to claim 1, characterized in that, Two vibration motors (20) are symmetrically fixed inside the housing (28) and are symmetrically arranged on both sides of all the sieves.

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