A flat dry sand and gravel production line and its production process

Abstract

The present invention relates to a flat dry sand and gravel production line and its production process. The production line includes a bar screen feeder, a jaw crusher, a single-cylinder hydraulic cone crusher, a multi-cylinder hydraulic cone crusher, a first vibrating screen, a vertical impact crusher, a second vibrating screen, and a third vibrating screen arranged on the sand and gravel conveying path; the production process includes bar screen feeding, jaw crushing, secondary cone crushing, vertical crushing combined with multi-stage screening. The production line of the present invention solves the problems from the aspects of the gradation of manufactured sand, the stone powder content, the round particle shape, the non-powder-coated surface of crushed stones, and the round particle shape through the principles of equipment and auxiliary links, making the quality of sand and gravel meet the specifications and be stable, the particle size distribution conform to the gradation curve, and realizing the optimization of processing costs; the production process of the present invention improves the gradation problem of large particles at both ends and small particles in the middle of manufactured sand and the problem of powder coating on crushed stones.

Description

Technical Field

[0001] The present invention relates to the technical field of machine-made sand processing, and in particular to a flat-laying dry-process sand and gravel production line and a production process thereof. Background Art

[0002] Large-scale construction companies' sand and gravel production is highly dependent on the construction projects they're working on. From the supply and production of block rock to product specifications, grading, and quality requirements, these processes are completely influenced by the specific project's needs. These companies typically adopt a self-production model, significantly different from processing in building materials mines. During existing project construction, manufactured sand production and processing often requires multiple feed points. Rock properties vary significantly depending on the construction site, making production and processing difficult to control. Furthermore, manufactured sand processing is only one step in the overall concrete production process. While controlling processing costs is crucial, optimizing the overall concrete performance is crucial.

[0003] The applicant adopted the traditional flat-lay dry production line to process and produce machine-made sand in the Yueqing Bay Bridge and Connection Project and the Hangzhou-Shaoxing-Taiwan Three-Standard Project in Zhejiang Province. The process flow is as follows: the raw materials pass through the silo and feeder to the jaw crusher for crushing to the transition silo, and from the transition silo to the standard cone crusher for screening by vibrating screen. Particles larger than 33mm are finely crushed and then screened by the standard cone crusher and vibrating screen. All particles smaller than 33mm are shaped and crushed by the sand making machine and then screened for sand and gravel. The corresponding flat-lay dry production equipment and accessories are: rod feeder, jaw crusher, waste soil screen, cone, vibrating screen, sand making machine, vacuum cleaner, and water dust reduction at the drop point. The "three crushing and one shaping" process in the above-mentioned production line is well-set up, but it produces crushed stone and machine-made sand. The surface of the crushed stone is covered with a layer of stone powder, the machine-made sand grading is more at the ends and less in the middle, and the stone powder content of the machine-made sand is difficult to control stably and exceeds the specifications. The machine-made sand is difficult to use in the upper structure of the project. The crushed stone needs to be washed with water twice before it can be further used in the upper high-grade concrete construction. The grading of the produced crushed stone does not meet the demand, and a large amount of crushed stone of some specifications is piled up in the gravel yard, resulting in increased production costs.

[0004] Therefore, how to improve the traditional dry production line from the perspectives of machine-made sand grading, stone powder content, particle shape, no powder coating on the surface of crushed stone, and particle shape, and form the optimization principle of flat-laid dry sand and gravel production through innovative introduction of auxiliary equipment, expansion of equipment, closed-loop circuit, material selection and other methods, and study the adverse factors of flat-laid dry production line that affect the quality of machine-made sand and gravel, and then form a set of key control technologies for green processing and high product quality based on flat-laid dry sand and gravel self-processing production line, is a problem that needs to be solved urgently. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the first object of the present invention is to provide a flat dry sand and gravel production line, which has the advantages of stable and controllable sand and gravel quality and reduced processing costs.

[0006] The second object of the present invention is to provide a flat dry sand and gravel production process, which has the advantages of adapting to the gradation of manufactured sand and no powder wrapping on crushed stones.

[0007] To achieve the above first object, the present invention provides the following technical solutions:

[0008] A flat dry sand and gravel production line includes a bar screen feeder, a jaw crusher, a single-cylinder hydraulic cone crusher, a multi-cylinder hydraulic cone crusher, a first vibrating screen, a vertical impact crusher, a second vibrating screen, and a third vibrating screen arranged on the sand and gravel conveying path; there are two discharge ends provided at the discharge end of the bar screen feeder, and one of the discharge ends is transitionally connected to the feed end of the jaw crusher; the discharge end of the jaw crusher is transitionally connected to the feed end of the single-cylinder hydraulic cone crusher; the discharge ends of the single-cylinder hydraulic cone crusher and the multi-cylinder hydraulic cone crusher are transitionally connected to the feed end of the first vibrating screen; there are multiple discharge ends provided at the discharge end of the first vibrating screen, and at least two discharge ends are respectively transitionally connected to the feed ends of the multi-cylinder hydraulic cone crusher and the vertical impact crusher; the discharge end of the vertical impact crusher is transitionally connected to the feed end of the second vibrating screen; there are multiple discharge ends provided at the discharge end of the second vibrating screen, and one of the discharge ends is transitionally connected to the feed end of the third vibrating screen; there are multiple discharge ends provided at the discharge end of the third vibrating screen, and one of the discharge ends is transitionally connected to the feed end of the vertical impact crusher.

[0009] Furthermore, it also includes a muck screen, a muck bin, and a transfer warehouse arranged on the sand and gravel conveying path. The other discharge end of the bar screen feeder is transitionally connected to the feed end of the muck screen. There are two discharge ends provided at the discharge end of the muck screen and are respectively transitionally connected to the feed ends of the muck bin and the transfer warehouse. The discharge end of the jaw crusher is transitionally connected to the feed end of the single-cylinder hydraulic cone crusher through a transfer bin.

[0010] Furthermore, at least two multi-cylinder hydraulic cone crushers are arranged in parallel.

[0011] Furthermore, at least two of the first vibrating screen, the second vibrating screen, and the third vibrating screen are arranged in parallel.

[0012] Furthermore, it also includes a first bin for accommodating sand and gravel of 0 - 5mm. One of the discharge ends of the first vibrating screen is transitionally connected to the first bin.

[0013] Further, it further includes a second bin for accommodating 20 - 30 mm sand and gravel and a third bin for accommodating 0 - 4 mm sand and gravel. Two discharge ends of the second vibrating screen are respectively connected to the second bin and the third bin in a transitional manner.

[0014] Further, a humidifying mixer is arranged on the conveying path between the second vibrating screen and the third bin.

[0015] Further, it further includes a fourth bin for accommodating 5 - 10 mm sand and gravel and a fifth bin for accommodating 10 - 20 mm sand and gravel. Two discharge ends of the third vibrating screen are respectively connected to the fourth bin and the fifth bin in a transitional manner.

[0016] Further, it further includes a plurality of bag - type dust collectors, and the inlet ends of these bag - type dust collectors are respectively arranged close to the feeding ends of the jaw crusher, single - cylinder hydraulic cone crusher, multi - cylinder hydraulic cone crusher, first vibrating screen, vertical impact crusher, second vibrating screen and third vibrating screen.

[0017] To achieve the above - mentioned first object, the present invention provides the following technical solutions:

[0018] A flat - type dry - process sand and gravel production process includes the following steps:

[0019] S1 The bar - screen feeder screens out sand and gravel with a size of less than 100 mm and conveys it to the muck screen, and conveys sand and gravel with a size of more than 100 mm to the jaw crusher. The muck screen screens out muck waste and sand and gravel with a size of more than 20 mm, and conveys them to the muck bin and the transfer warehouse respectively. The jaw crusher crushes the sand and gravel to 100 - 200 mm and conveys it to the transfer warehouse.

[0020] S2 Lift the sand and gravel obtained in S1 to the single - cylinder hydraulic cone crusher for crushing, and the sand and gravel crushed by the single - cylinder hydraulic cone crusher and the multi - cylinder hydraulic cone crusher are jointly conveyed to the first vibrating screen for screening.

[0021] S3 After the first vibrating screen screens the sand and gravel, the sand and gravel with a size of 0 - 5 mm is conveyed to the first bin, the sand and gravel with a size of 5 - 13 mm and 13 - 33 mm is conveyed to the vertical impact crusher, and the sand and gravel with a size of more than 33 mm is conveyed to the multi - cylinder hydraulic cone crusher.

[0022] S4 The vertical impact crusher crushes the sand and gravel and conveys it to the second vibrating screen.

[0023] S5 After the second vibrating screen screens the sand and gravel, the sand and gravel with a size of 20 - 30 mm is conveyed to the second bin, the sand and gravel with a size of 5 - 20 mm is conveyed to the third vibrating screen, and the remaining sand and gravel is conveyed to the third bin after passing through the humidifying mixer.

[0024] After screening the sand and gravel by the third vibrating screen described in S6, the sand and gravel of 5-10 mm are transported into the fourth bunker, the sand and gravel of 10-20 mm are transported into the fifth bunker, and the remaining sand and gravel are transported into the vertical impact crusher.

[0025] In summary, the beneficial technical effects of the present invention are as follows:

[0026] 1. The production line of the present invention, through the combination of jaw crushing, secondary cone crushing, vertical crushing and multi-stage screening, solves the problems from the aspects of the gradation of manufactured sand, the content of stone powder, the roundness of particle shape, no powder coating on the surface of crushed stone and the roundness of particle shape, through the principles of equipment and auxiliary links, so that the quality of sand and gravel meets the specifications and is stable, the particle size distribution conforms to the gradation curve, and the processing cost is optimized;

[0027] 2. By studying the adverse factors affecting the quality of manufactured sand and crushed stone in the flat-laying dry-process production line, the present invention improves the process and equipment in the process links and the screening of the quality of the mother material, and solves the gradation problem of manufactured sand with large sizes at both ends and small size in the middle. It proposes control means for controlling the content of particles below 0.6 mm and above 1.18 mm in manufactured sand in the process. For crushed stone without powder coating, to solve the surplus of 5-10 mm specifications and when the methylene blue index value is within 1, the upper limit of the stone powder content of manufactured sand is taken as 10-15%. A series of fine control systems are proposed to form a set of green processing and high-quality product key control technologies for the flat-laying dry-process sand and gravel self-processing production line. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the flat-laying dry-process sand and gravel production line of the present invention.

[0029] Figure 2 It is a schematic connection diagram between the bar screen feeder and the jaw crusher of the present invention.

[0030] Figure 3 It is a schematic connection diagram between the bar screen feeder, the jaw crusher, the muck screen and the transfer warehouse of the present invention.

[0031] Figure 4 It is a schematic connection diagram between the single-cylinder hydraulic cone crusher and the multi-cylinder hydraulic cone crusher of the present invention.

[0032] Figure 5 It is a schematic connection diagram between the multi-cylinder hydraulic cone crusher and the first vibrating screen of the present invention.

[0033] Figure 6 It is a schematic structural diagram of the vertical impact crusher of the present invention.

[0034] Figure 7It is a schematic diagram of the connection relationship between the vertical impact crusher of the present invention and the second vibrating screen.

[0035] Figure 8 It is a schematic diagram of the connection relationship between the second vibrating screen and the third vibrating screen of the present invention.

[0036] In the figure, 1 is the jaw crushing and screening unit; 11 is the grizzly feeder; 12 is the jaw crusher; 13 is the muck screen; 14 is the transfer bin; 2 is the hydraulic crushing and screening unit; 21 is the single-cylinder hydraulic cone crusher; 22 is the multi-cylinder hydraulic cone crusher; 23 is the first vibrating screen; 3 is the impact crushing and screening unit; 31 is the vertical impact crusher; 32 is the second vibrating screen; 33 is the third vibrating screen; 4 is the muck pile; 5 is the first bin; 6 is the second bin; 7 is the third bin; 8 is the fourth bin; 9 is the fifth bin; 10 is the bag filter. Specific Embodiments

[0037] In order to make the technical means, creative features, achieved purposes and functions of the present invention clearer and easier to understand, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] Refer to Figure 1 , a flat dry sand and gravel production line disclosed by the present invention includes a jaw crushing and screening unit 1, a hydraulic crushing and screening unit 2, and an impact crushing and screening unit 3 connected in sequence along the sand and gravel conveying direction, and also includes a muck pile 4, a first bin 5 for accommodating sand and gravel of 0 - 5 mm, a second bin 6 for accommodating sand and gravel of 20 - 30 mm, a third bin 7 for accommodating sand and gravel of 0 - 4 mm, a fourth bin 8 for accommodating sand and gravel of 5 - 10 mm, and a fifth bin 9 for accommodating sand and gravel of 10 - 20 mm. Among them, the discharge end of the jaw crushing and screening unit 1 is transitionally connected to the muck pile 4 and the feed end of the hydraulic crushing and screening unit 2 respectively, the discharge end of the hydraulic crushing and screening unit 2 is transitionally connected to the first bin 5 and the feed end of the impact crushing and screening unit 3 respectively, and the discharge end of the impact crushing and screening unit 3 is transitionally connected to the third bin 7, the fourth bin 8, and the fifth bin 9 respectively.

[0039] Refer to Figures 2 - 3 , the jaw crushing and screening unit 1 includes a grizzly feeder 11, a jaw crusher 12, a muck screen 13, and a transfer bin 14. There are two discharge ends of the grizzly feeder 11, which are respectively transitionally connected to the feed ends of the jaw crusher 12 and the muck screen 13. There are two discharge ends of the muck screen 13, which are respectively transitionally connected to the muck bin and the feed end of the transfer bin 14. The discharge end of the jaw crusher 12 is transitionally connected to the feed end of the hydraulic crushing and screening unit 2 through a transfer bin.

[0040] The flat dry production line processes manufactured sand and crushed stones, ensuring that the moisture content of the block stone mother material and the raw materials for primary crushing is low, and the pure block stones are free of soil impurities. Before entering the jaw crusher, a double-layer staggered screen bar with a 100-mm aperture and a length of 2 m is used (through the working principle that during the vibrating feeding process, fine particles continuously sink to the bottom, and coarse particles rise to the surface. After passing through the staggered platform, the fine particles at the top of the thick layer are overturned to the bottom, and then through the vibrating feeding process again, fine particles continuously sink to the bottom, and coarse particles rise to the surface), to screen out the soil-containing impurities, and convey them to the waste soil screen to screen out particles smaller than 25 mm. The moisture content of this part is high and there is a lot of mud.

[0041] Refer to Figures 4 - 5 , the hydraulic crushing and screening unit 2 includes a single-cylinder hydraulic cone crusher 21, a pair of multi-cylinder hydraulic cone crushers 22 arranged in parallel, and a pair of first vibrating screens 23 arranged in parallel. The discharge end of the transfer bin is transitionally connected to the feed end of the single-cylinder hydraulic cone crusher 21, the discharge ends of the single-cylinder hydraulic cone crusher 21 and the multi-cylinder hydraulic cone crusher 22 are transitionally connected to the feed end of the first vibrating screen 23, and the discharge end of the first vibrating screen 23 is provided with a plurality of transition connections, respectively, to the feed ends of the first bin 5, the multi-cylinder hydraulic cone crusher 22, and the impact crushing and screening unit 3.

[0042] After primary crushing, there is still a certain moisture content and wrapped soil. To ensure the quality of the subsequent raw materials, particles smaller than 5 mm are screened out. This vibrating screen is set as the first vibrating screen, and the cone is used to continue crushing at a rotational speed of 500 r / min, and again, the working principle of vibrating off the miscellaneous mud moisture adhering to the surface of the block stones and combining them with particles smaller than 5 mm is used.

[0043] Refer to Figures 6 - 8 , the impact crushing and screening unit 3 includes a vertical impact crusher 31, a pair of second vibrating screens 32 arranged in parallel, and a pair of third vibrating screens 33 arranged in parallel. The feed end of the vertical impact crusher 31 is transitionally connected to the discharge end of the first vibrating screen 23, and the discharge end is transitionally connected to the feed end of the second vibrating screen 32. The discharge end of the second vibrating screen 32 is provided with a plurality of transition connections, respectively, to the feed ends of the third bin 7 and the third vibrating screen 33, and a humidifying stirrer is provided on the conveying path between the second vibrating screen 32 and the third bin 7. The discharge end of the third vibrating screen 33 is provided with a plurality of transition connections, respectively, to the feed ends of the fourth bin 8, the fifth bin 9, and the vertical impact crusher 31.

[0044] The raw materials of 5 - 35 mm extracted by cone crushing are screened after passing through a vertical impact crusher to produce particles of approximately 0 - 4 mm (semi-finished manufactured sand), 6 - 12 mm, 12 - 23 mm, and 23 - 30 mm. By adjusting the inlet muzzles to form the working principle of full stone-on-stone or partial stone-on-stone, the problem of round particle shape is solved. The particles in the range of 4 - 6 mm fall into the conveyor belt through the vibrating screen feeding chute and enter the vertical impact crusher for re-crushing through a loop principle, forming particles less than about 0.3 mm, making up for the problem of large at both ends and small in the middle produced by traditional flat dry production, and solving the problem of the grading curve of manufactured sand. In addition, the humidifying stirrer uses the principle of motor rotation to disperse the semi-finished manufactured sand that falls in. The stone powder of the manufactured sand that is lifted is sucked away by the wind, continues to fall into the rotating mixer, is evenly mixed, and finally enters the finished product bin to obtain manufactured sand with a stone powder content meeting the specification requirements.

[0045] Refer to Figure 1 , in addition, the above production line further includes a plurality of bag dust collectors 10, and the inlet ends of these bag dust collectors 10 are respectively arranged close to the feeding ends of the jaw crusher 12, single-cylinder hydraulic cone crusher 21, multi-cylinder hydraulic cone crusher 22, first vibrating screen 23, vertical impact crusher 31, second vibrating screen 32, and third vibrating screen 33.

[0046] Correspondingly, the present invention also discloses a flat dry sand and gravel production process, including the following steps,

[0047] S1 The bar screen feeder 11 screens out sand and gravel below 100 mm and conveys them to the muck screen 13, and the sand and gravel above 100 mm are conveyed to the jaw crusher 12. The muck screen 13 screens out soil waste and sand and gravel above 20 mm, and conveys them to the muck bin and the transfer warehouse 14 respectively. The jaw crusher 12 crushes the sand and gravel to 100 - 200 mm and conveys them to the transfer warehouse 14;

[0048] S2 The sand and gravel obtained in S1 are lifted to the single-cylinder hydraulic cone crusher 21 for crushing, and the sand and gravel crushed by the single-cylinder hydraulic cone crusher 21 and the multi-cylinder hydraulic cone crusher 22 are jointly conveyed to the first vibrating screen 23 for screening;

[0049] S3 After the first vibrating screen 23 screens the sand and gravel, the sand and gravel of 0 - 5 mm are conveyed to the first bin 5, the sand and gravel of 5 - 13 mm and 13 - 35 mm are conveyed to the vertical impact crusher 31, and the sand and gravel above 35 mm are conveyed to the multi-cylinder hydraulic cone crusher 22;

[0050] S4 The vertical impact crusher 31 crushes the sand and gravel and conveys them to the second vibrating screen 32;

[0051] After the second vibrating screen 32 screens the sand and gravel, the sand and gravel of 20 - 30 mm is transported to the second bunker 6, the sand and gravel of 5 - 20 mm is transported to the third vibrating screen 33, and the remaining sand and gravel is transported to the third bunker 7 after passing through the humidifying mixer;

[0052] After the third vibrating screen 33 screens the sand and gravel, the sand and gravel of 5 - 10 mm is transported to the fourth bunker 8, the sand and gravel of 10 - 20 mm is transported to the fifth bunker 9, and the remaining sand and gravel is transported to the vertical impact crusher 31.

[0053] The specific implementation methods of the above process include,

[0054] (1) Select 1 double - stage bar screen feeder 11 with a feeding capacity of not less than 600 t / h (the larger model is convenient for screening out the fine materials in the tunnel slag stone). There are trapezoidal bars at the front end, which can screen out the materials of ≤100 mm and transport them to the muck screen 13 through the belt conveyor for screening, screening out the soil waste and the sand and gravel of ≥20 mm; among them, the waste is transported to the waste pile to ensure the quality of the later products; the sand and gravel of ≥20 mm is transported to the transfer warehouse 14 through the belt conveyor and no longer enters the jaw crusher for repeated crushing; the whole bar screen feeder 11 is frequency - controlled by a variable - frequency motor and can be manually or intelligently fed through DCS (PLC).

[0055] (2) First crushing (coarse crushing): Select 1 C6X125 jaw crusher 12 with a production capacity of not less than 550 t / h, the maximum feeding particle size of which is not less than 800 mm, and the discharge port setting range is 100 - 200 mm. The crushed materials are transported to the transfer warehouse 14 through the belt conveyor.

[0056] (3) Transfer warehouse 14: The transfer warehouse 14 stores the materials of 0 - 200 mm after the first crushing and pre - screened by the muck screen 13 (the screening particle size of the materials can be adjusted). When the transfer warehouse 14 is full, it can supply the second crushing production for 3 - 5 hours, which can effectively utilize the maintenance intervals of the front - end and back - end equipment to continue production, ensure the continuity of production, improve work efficiency and production benefits, and at the same time, 3 vibrating feeders are configured to supply materials smoothly and continuously for the second crushing process.

[0057] (4) Second crushing (medium crushing): Use 1 HST250S1 single - cylinder hydraulic cone crusher 21 with a production capacity of 550 t / h, and the adjustable range of the discharge port is 20 - 60 mm. The sand and gravel produced by the second crushing is transported to the first vibrating screen 23 through the belt conveyor for screening. The sand and gravel of 5 - 33 mm directly enters the vertical impact crusher 31 for shaping and sand making, and the sand and gravel of more than 33 mm enters the third crushing for fine crushing.

[0058] (5) Tertiary crushing (fine crushing): Two HPT300M multi-cylinder hydraulic cone crushers 22 with a processing capacity of 400 t / h are used to mainly re-crush the sand and gravel ≥ 33 mm after the secondary screening by the first vibrating screen 23. The adjustable range of the discharge opening is 13 - 45 mm, and the discharge size is 0 - 33 mm. Here, one single-cylinder hydraulic cone crusher 21 and two multi-cylinder hydraulic cone crushers 22 are respectively used for medium crushing and fine crushing. This can not only reduce the load on the cone and minimize equipment wear, but also enable the raw materials to be classified and crushed, thus ensuring the output of medium and fine crushing and the integrity of the product particle shape. At the same time, the raw materials can be crushed in the shortest time after entering the shaping sand making machine, avoiding increased costs due to repeated crushing. Two first vibrating screens 23 are selected as the screening equipment, with a screen mesh specification of 5 - 33 mm and a processing capacity of 120 - 900 t / h per single screen. The stone chips of 0 - 5 mm are screened out by the vibrating screen. The stone chips with a large mud content or wet in the raw materials can be used for tunnel shotcreting, and the stone chips with a low mud content and dry can directly enter the transfer bin of the sand making machine as needed; the crushed stones of 5 - 33 mm directly enter the transfer bin of the sand making machine.

[0059] (6) Quaternary crushing (shaping and sand making): One VSI6X1150 vertical impact crusher 31 with a processing capacity of 500 t / h is used to mainly perform rapid sand making and shaping on the 5 - 33 mm and part of the 0 - 5 mm materials after secondary and tertiary crushing. The produced semi-finished machine-made sand, 5 - 10, 10 - 20, 20 - 30 are all processed by the equipment. The semi-finished machine-made sand is sucked out of the excess stone powder through the air separation equipment to reach the machine-made sand meeting the specifications. The 5 - 10, 10 - 20, 20 - 30 crushed stones are secondarily screened by the second vibrating screen and the third vibrating screen and the stone powder wrapped on the surface of the crushed stones is removed by wind power and then discharged into the storage bin after meeting the specifications.

[0060] (7) Bag dust collector 10: The whole production line uses dry dust removal. Two bag dust collectors 10 and the water mist spraying system respectively carry out effective dust removal for the five major parts of primary crushing, secondary crushing, tertiary crushing, quaternary crushing, and screening. The 1# dust collector mainly conducts dust removal on the jaw crusher 12, muck screen 13, single-cylinder hydraulic cone crusher 21, and multi-cylinder hydraulic cone crusher 22. The 2# dust collector mainly conducts dust removal on the first vibrating screen 23, the second vibrating screen 32, and their material dropping points. The 3# dust collector mainly conducts dust removal on the vertical impact crusher 31, the third vibrating screen 33, and their material dropping points. The effective dust filtration area of the three dust collectors exceeds 1800 ㎡, which can achieve full coverage dust removal of the equipment area and meet the environmental protection requirements.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A flat dry sand and gravel production process, characterized in that: The flat dry sand and gravel production line includes a bar screen feeder (11), a jaw crusher (12), a single-cylinder hydraulic cone crusher (21), a multi-cylinder hydraulic cone crusher (22), a first vibrating screen (23), a vertical impact crusher (31), a second vibrating screen (32), and a third vibrating screen (33) arranged on the sand and gravel conveying path; two discharge ends are provided at the discharge end of the bar screen feeder (11), and one of the discharge ends is transitionally connected to the feed end of the jaw crusher (12); the discharge end of the jaw crusher (12) is transitionally connected to the feed end of the single-cylinder hydraulic cone crusher (21); the discharge ends of the single-cylinder hydraulic cone crusher (21) and the multi-cylinder hydraulic cone crusher (22) are transitionally connected to the feed end of the first vibrating screen (23); multiple discharge ends are provided at the discharge end of the first vibrating screen (23), and at least two discharge ends are respectively transitionally connected to the feed ends of the multi-cylinder hydraulic cone crusher (22) and the vertical impact crusher (31); the discharge end of the vertical impact crusher (31) is transitionally connected to the feed end of the second vibrating screen (32); multiple discharge ends are provided at the discharge end of the second vibrating screen (32), and one of the discharge ends is transitionally connected to the feed end of the third vibrating screen (33); multiple discharge ends are provided at the discharge end of the third vibrating screen (33), and one of the discharge ends is transitionally connected to the feed end of the vertical impact crusher (31); The production process includes the following steps: S1 The bar screen feeder (11) screens out sand and gravel below 100 mm and conveys it to the muck screen (13), and conveys the sand and gravel above 100 mm to the jaw crusher (12). The muck screen (13) screens out muck waste and sand and gravel above 20 mm, and conveys them to the muck bin and the transfer warehouse (14) respectively. The jaw crusher (12) crushes the sand and gravel to 100 - 200 mm and conveys it to the transfer warehouse (14); S2 Lift the sand and gravel obtained in S1 to the single-cylinder hydraulic cone crusher (21) for crushing, and the sand and gravel crushed by the single-cylinder hydraulic cone crusher (21) and the multi-cylinder hydraulic cone crusher (22) are jointly conveyed to the first vibrating screen (23) for screening; S3 After the first vibrating screen (23) screens the sand and gravel, the sand and gravel of 0 - 5 mm are conveyed to the first bin (5), the sand and gravel of 5 - 13 mm and 13 - 33 mm are conveyed to the vertical impact crusher (31), and the sand and gravel above 33 mm are conveyed to the multi-cylinder hydraulic cone crusher (22); S4 The vertical impact crusher (31) crushes the sand and gravel and conveys it to the second vibrating screen (32); S5 After the second vibrating screen (32) screens the sand and gravel, the sand and gravel of 20 - 30 mm are conveyed to the second bin (6), the sand and gravel of 5 - 20 mm are conveyed to the third vibrating screen (33), and the remaining sand and gravel are conveyed to the third bin (7) after passing through the humidifying mixer; After screening the sand and gravel by the third vibrating screen (33) described in S6, the sand and gravel with a size of 5 - 10 mm is conveyed into the fourth silo (8), the sand and gravel with a size of 10 - 20 mm is conveyed into the fifth silo (9), and the remaining sand and gravel is conveyed into the vertical impact crusher (31).

2. The flat dry sand and gravel production process according to claim 1, characterized in that: It further includes a muck screen (13), a muck silo, and a transfer warehouse (14) arranged on the sand and gravel conveying path. The other discharge end of the grizzly feeder (11) is transitionally connected to the feed end of the muck screen (13). The discharge end of the muck screen (13) is provided with two and is respectively transitionally connected to the feed ends of the muck silo and the transfer warehouse (14). The discharge end of the jaw crusher (12) is transitionally connected to the feed end of the single-cylinder hydraulic cone crusher (21) through a transfer bin.

3. A tiled dry sand and gravel production process according to claim 1, characterized in that: At least two multi-cylinder hydraulic cone crushers (22) are arranged in parallel.

4. A tiled dry sand and gravel production process according to claim 1, characterized in that: At least two first vibrating screens (23), second vibrating screens (32), and third vibrating screens (33) are arranged in parallel.

5. A flat dry sand and gravel production process according to claim 1, characterized in that: It further includes a first silo (5) for accommodating sand and gravel with a size of 0 - 5 mm. One of the discharge ends of the first vibrating screen (23) is transitionally connected to the first silo (5).

6. The flat dry sand and gravel production process according to claim 1, characterized in that: It further includes a second silo (6) for accommodating sand and gravel with a size of 20 - 30 mm and a third silo (7) for accommodating sand and gravel with a size of 0 - 4 mm. Two of the discharge ends of the second vibrating screen (32) are respectively transitionally connected to the second silo (6) and the third silo (7).

7. A flat dry sand and gravel production process according to claim 4, characterized in that: A humidifying stirrer is arranged on the conveying path between the second vibrating screen (32) and the third silo (7).

8. A flat dry sand and gravel production process according to claim 1, characterized in that: It further includes a fourth silo (8) for accommodating sand and gravel with a size of 5 - 10 mm and a fifth silo (9) for accommodating sand and gravel with a size of 10 - 20 mm. Two of the discharge ends of the third vibrating screen (33) are respectively transitionally connected to the fourth silo (8) and the fifth silo (9).

9. A flat dry sand and gravel production process according to claim 1, characterized in that: It further includes a plurality of bag dust collectors (10). The inlet ends of these bag dust collectors (10) are respectively arranged near the feed ends of the jaw crusher (12), single-cylinder hydraulic cone crusher (21), multi-cylinder hydraulic cone crusher (22), first vibrating screen (23), vertical impact crusher (31), second vibrating screen (32), and third vibrating screen (33).

Images