Modular sand aggregate efficient deployment production line

Abstract

The utility model relates to sand and gravel aggregate production equipment field provides a modular sand and gravel aggregate efficient deployment production line, technical scheme is: including vibration feeder, primary crushing unit, secondary crushing unit, screening unit, transfer conveyor and multiple unloading conveyors. Vibration feeder output end links primary crushing unit input end, and primary crushing unit output end links screening unit input end through transfer conveyor, and the screening unit sieve material outlet links secondary crushing unit input end, and the sieve material outlet corresponds multiple unloading conveyors, and secondary crushing unit output end links transfer conveyor and forms circulation crushing loop. This scheme has the advantages of fast deployment, process flexible adjustment and efficient circulation crushing.

Description

Technical Field

[0001] This utility model relates to the technical field of sand and gravel aggregate production equipment, and in particular to a modular sand and gravel aggregate high-efficiency deployment production line. Background Technology

[0002] Traditional sand and gravel aggregate production lines, with their fixed equipment layout, suffer from significant technical bottlenecks. During deployment, substantial time is required for concrete foundation pouring, and heavy equipment such as jaw crushers and cone crushers must be hoisted one by one, resulting in a construction cycle that can last for months and severely restricts the rapid commissioning needs of mining projects. In terms of process flow, existing production lines are structurally rigid. When adjustments to crushing stages or changes in screening specifications are needed, the installed equipment must be disassembled and reassembled, failing to adapt to changes in the crushing characteristics of ores of varying hardness and struggling to respond to market fluctuations in aggregate particle size specifications. Regarding equipment maintenance and transportation, traditional fixed belt conveyors, due to their inability to fold, lead to high transportation costs and low relocation efficiency when operating in remote mining areas. While existing mobile crushing stations attempt to improve flexibility through individual unit movement, they only achieve the movement of individual equipment and fail to solve the modular coordination problem of the entire production line: crushing and screening units still require on-site assembly and debugging, the conveying system lacks rapid folding and transfer capabilities, and it cannot achieve the advanced process of automatically returning materials to the screening unit after secondary crushing to form a closed-loop recycling crushing system.

[0003] This technological deficiency severely restricts the deployment efficiency, process adaptability, and transportation convenience of sand and gravel aggregate production lines. To address these issues, existing technologies urgently need improvement. Summary of the Invention

[0004] To address the aforementioned issues, the purpose of this invention is to provide a modular sand and gravel aggregate production line with high efficiency deployment, featuring rapid deployment, flexible process adjustment, and efficient cyclic crushing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This application provides a modular sand and gravel aggregate high-efficiency deployment production line, the technical solution of which is as follows: including a vibrating feeder, a primary crushing unit, a secondary crushing unit, a screening unit, a transfer conveyor and multiple discharge conveyors;

[0007] • The output end of the vibrating feeder is connected to the input end of the primary crushing unit;

[0008] • The output of the primary crushing unit is connected to the input of the screening unit via a transfer conveyor;

[0009] • The oversize outlet of the screening unit is connected to the input of the secondary crushing unit, and the undersize outlet corresponds to multiple feeding conveyors;

[0010] • The output end of the secondary crushing unit is connected to a transfer conveyor to form a circulating crushing loop.

[0011] Furthermore, this application also proposes that the primary crushing unit adopts a jaw crusher or a gyratory crusher; and the secondary crushing unit adopts a cone crusher or an impact crusher.

[0012] Furthermore, this application also proposes that the transfer conveyor includes a first conveyor and a second conveyor;

[0013] • The output of the primary crushing unit is connected to the input of the screening unit via the first conveyor;

[0014] • The output of the secondary crushing unit is connected to the input of the screening unit via the first conveyor;

[0015] • The outlet of the screening unit is connected to the input of the secondary crushing unit via a second conveyor.

[0016] Furthermore, this application proposes that the first conveyor, the second conveyor, and the multiple unloading conveyors are all configured with an upward-sloping feeding direction from the beginning to the end. Furthermore, this application proposes that each conveyor includes multiple supports, a conveyor frame, and a conveyor belt;

[0017] • The conveyor support structure consists of multiple main support sections and hinged connecting supports that connect adjacent main support sections;

[0018] • The main support frame can be flipped and stacked around the hinge point to achieve folding.

[0019] Furthermore, this application also proposes a roller system disposed on the connecting bracket:

[0020] • The upper idler roller bracket is fixed above the connecting bracket, and the upper idler roller rotates and is positioned on it;

[0021] • The lower idler roller bracket is fixed below the connecting bracket, and the lower idler roller rotates and is positioned on it.

[0022] Furthermore, this application also proposes that both the primary crushing unit and the secondary crushing unit are installed on the support frame;

[0023] The supporting frame includes a rectangular frame;

[0024] • The diagonally arranged inter-column support rods are distributed at the corners of the rectangular frame.

[0025] Furthermore, this application also proposes that the rectangular frame is formed by bolting together multiple horizontal and vertical beams.

[0026] As can be seen from the above, the modular sand and gravel aggregate high-efficiency deployment production line and its crushing unit, conveyor and support frame provided in this application, through the modular combination of vibrating feeder, multi-stage crushing unit and circulating conveying system, realizes rapid crushing and screening of materials and closed-loop circulation processing, which has the advantages of shortening the deployment cycle, adapting to process adjustment needs and improving transportation convenience. Attached Figure Description

[0027] Figure 1 This is a top view diagram of a modular sand and gravel aggregate high-efficiency deployment production line provided in this application.

[0028] Figure 2 This is a side view of a modular sand and gravel aggregate high-efficiency deployment production line provided in this application.

[0029] Figure 3 for Figure 2 Enlarged view of part A.

[0030] Figure 4 This is a structural diagram of the supporting frame. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In existing technologies, traditional sand and gravel aggregate production lines employ a fixed equipment layout, which suffers from low deployment efficiency, rigid process flow, and difficulties in transportation and maintenance. Fixed equipment requires on-site pouring of concrete foundations and hoisting of heavy equipment one by one, resulting in a long construction period; adjustments to crushing stages and screening specifications require disassembly and relocation of equipment; and the inability to fold fixed belt conveyors leads to high transportation costs. While mobile crushing plants attempt to improve flexibility, they only enable the movement of individual machines, with crushing and screening units still relying on on-site assembly. The conveying system cannot be quickly folded and transferred, and a closed-loop recycling crushing circuit cannot be constructed.

[0037] To address the aforementioned problems and the three core shortcomings of traditional production lines, the inventors conducted research from the perspective of modular collaborative production. First, they considered how to reduce on-site installation time through equipment modularization, and then considered a closed-loop design for the crushing circuit to improve process flexibility. By analyzing the material flow path, they discovered that the recycling structure of material returning to the screening stage after secondary crushing can dynamically adjust the number of crushing stages. Finally, combined with a foldable conveyor system design, they achieved rapid disassembly, assembly, and transfer of the entire line.

[0038] like Figure 1-4 As shown, this application proposes a modular sand and gravel aggregate high-efficiency deployment production line, including...

[0039] The system includes a vibrating feeder 201, a primary crushing unit 101, a secondary crushing unit 102, a screening unit 103, a transfer conveyor 202, and multiple discharge conveyors 203. The output end of the vibrating feeder 201 is connected to the input end of the primary crushing unit 101.

[0040] The output end of the primary crushing unit 101 is connected to the input end of the screening unit 103 via the transfer conveyor 202;

[0041] The oversize outlet of the screening unit 103 is connected to the input end of the secondary crushing unit 102, and the undersize outlet corresponds to multiple feeding conveyors 203.

[0042] The output end of the secondary crushing unit 102 is connected to the transfer conveyor 202 to form a circulating crushing loop.

[0043] The vibrating feeder 201 is a device that uniformly conveys materials through vibration. Specifically, it can be implemented using an electromagnetic vibrator or an eccentric block vibration mechanism. Its function is to eliminate material accumulation and improve the feeding efficiency of the primary crushing unit 101. The primary crushing unit 101 is a device that performs coarse crushing of raw materials, its function being to crush large pieces of ore to a suitable particle size range for screening. The transfer conveyor 202 is a material conveying device connecting the crushing unit and the screening unit 103. Specifically, it can be implemented using a belt conveyor or a chain conveyor. Its function is to achieve directional material conveying between modules and support rapid assembly and disassembly. The circulating crushing loop refers to the closed path through which the output material from the secondary crushing unit 102 returns to the screening unit 103. This is achieved through the connection between the transfer conveyor 202 and the screening unit 103. Its function is to repeatedly crush substandard materials to improve the finished product qualification rate.

[0044] In this scheme, the vibrating feeder 201 uniformly conveys the raw materials to the primary crushing unit 101 for coarse crushing. The crushed material then enters the screening unit 103 via the transfer conveyor 202. The undersize material meeting the particle size requirements is directly output via multiple feeding conveyors 203. These multiple feeding conveyors 203 are generally suitable for transporting stones with different particle size requirements. For example, if the usable stone particle size is divided into 10-50cm, four feeding conveyors 203 are used to handle particles of 10-20cm, 20-30cm, 30-40cm, and 40-50cm respectively. Here, multiple feeding conveyors 203 are required to handle undersize materials at different diameter outlets of the screening unit 103. The oversize material that does not meet the requirements enters the secondary crushing unit 102 for secondary crushing. The material after the secondary crushing unit 102 returns to the screening unit 103 via the transfer conveyor 202, forming a material recycling path. The modules are connected through standardized interfaces, eliminating the need for on-site foundation pouring. The 202 transfer conveyor adopts a foldable structure for easy overall transportation.

[0045] Compared with existing technologies, traditional production lines use a fixed layout, which leads to time-consuming equipment disassembly and assembly. This solution, however, achieves rapid deployment through modular design. Existing technologies cannot dynamically adjust the crushing stages, while this solution uses a circulating crushing loop to allow materials to be crushed multiple times until they meet the standards. Traditional conveying systems are not foldable, which makes transportation difficult. This solution uses a standardized conveyor structure to support rapid disassembly and transfer.

[0046] In a further embodiment, the primary crushing unit 101 employs a jaw crusher or a gyratory crusher. A jaw crusher is a device that crushes materials through the periodic squeezing motion between a moving jaw and a fixed jaw; specifically, it can be implemented using a device with a V-shaped crushing chamber structure. It has a large crushing ratio and is suitable for processing large, hard ores. A gyratory crusher is a device that achieves continuous crushing by driving the moving cone to rotate through an eccentric sleeve; specifically, it can be implemented using a device with a spiral discharge port. It has high processing capacity and is suitable for large-scale primary crushing. The secondary crushing unit 102 employs a cone crusher or an impact crusher. A cone crusher is a device that achieves fine crushing through the layered crushing principle between a moving cone and a fixed cone; specifically, it can be implemented using a device with hydraulically adjustable discharge port size. It can produce uniform particle shapes and is suitable for medium to high hardness materials. An impact crusher is a device that crushes materials by having a high-speed rotor impact the material, causing it to strike the impact plate. Specifically, it can be implemented using a device with a multi-stage impact chamber structure. Its crushed products have excellent particle shapes and are suitable for medium to low hardness materials.

[0047] like Figure 1 and 2 As shown, the transfer conveyor 202 includes a first conveyor 202a and a second conveyor 202b;

[0048] The output end of the primary crushing unit 101 is connected to the input end of the screening unit 103 via the first conveyor 202a;

[0049] The output end of the secondary crushing unit 102 is connected to the input end of the screening unit 103 via the first conveyor 202a;

[0050] The oversize outlet of screening unit 103 is connected to the input end of secondary crushing unit 102 via second conveyor 202b.

[0051] The first conveyor 202a is a device for simultaneously conveying materials crushed by the primary crushing unit 101 and the secondary crushing unit 102. Specifically, it can be implemented using a belt conveyor, with its starting end switchable to connect to the discharge port of either the primary crushing unit 101 or the secondary crushing unit 102. The second conveyor 202b is a device for reverse conveying the oversize material separated by the screening unit 103 to the secondary crushing unit 102. Specifically, it can be implemented using a foldable belt conveyor, with its end connected to the feed port of the secondary crushing unit 102. In detail, the material crushed by the primary crushing unit 101 is conveyed to the screening unit 103 for particle size classification via the first conveyor 202a. The material after secondary crushing by the secondary crushing unit 102 also re-enters the screening unit 103 via the same first conveyor 202a. The screening unit 103 reverse conveys the undersize material to the secondary crushing unit 102 via the second conveyor 202b for cyclic crushing, forming a closed loop. Material conveying is achieved through a split-type conveyor system, merging and diverting materials, thus avoiding the space occupation caused by setting up multiple independent conveyors. Compared with existing technologies, traditional production lines use fixed conveyors to independently connect each piece of equipment, making it impossible to achieve material flow merging and conveying or to build a circulation loop. Furthermore, the inability to fold the conveyors leads to difficulties in transfer. This solution, through a split-type conveyor design, achieves material flow merging and conveying, reducing the number of devices, while establishing an automatic circulation crushing loop through independent reverse conveyors. The split structure also facilitates the folding and disassembly of the conveyors.

[0052] Furthermore, the first conveyor 202a, the second conveyor 202b, and the multiple feeding conveyors 203 are all configured with an upward-sloping feeding direction from the beginning to the end. This upward-sloping feeding direction means that the conveyor belt's running trajectory forms an angle with the horizontal plane. This can be achieved by installing height-adjustable support legs 10 at the bottom of the conveyor support 20. By adjusting the length of the support legs 10, the conveyor belt can create a continuously rising slope. This design allows the material to be propelled by the component of gravity during transport, avoiding material stagnation caused by flat conveying.

[0053] like Figure 3 As shown, each conveyor includes multiple legs 10, a conveyor frame 20, and a conveyor belt 30; the conveyor frame 20 is composed of multiple main frame sections 21 and hinged connecting frames 22 that connect adjacent main frame sections 21; the main frame sections 21 can be flipped and stacked around the hinge point to achieve folding.

[0054] The hinged connecting bracket 22 refers to a movable component that connects two main support sections 21 via a rotating joint. Specifically, it can be implemented using a metal connecting rod with a pin structure. This component maintains linear alignment of adjacent main support sections 21 in the unfolded state and allows the main support sections 21 to rotate and stack around the pin in the folded state. The main support section 21 refers to the rigid support unit constituting the conveyor support 20. Specifically, it can be implemented using a segmented channel steel frame structure. Each main support section 21 is connected in series via the hinged connecting bracket 22 to form a continuous conveying path. When folded, each section can rotate around the hinge point to form a compact stacked shape. The support leg 10 refers to the vertical column supporting the conveyor support 20. Specifically, it can be implemented using a telescopic hydraulic support. The height of the support leg 10 can be adjusted to adapt to different terrains and maintain the working angle of the conveyor belt 30. In the transport state, the pin of the hinged connecting bracket 22 is unlocked, and the main support sections 21 rotate and stack around the hinge point, allowing multiple main support sections 21 to be stacked and compressed to compress the overall length. The support leg 10 retracts to its shortest state and is fixed to the folded bracket, while the conveyor belt 30 is simultaneously wound and stored. In the deployed state, the main bracket 21 unfolds around the hinge point to a straight line, and the pin is inserted into the locking hole to achieve linear fixation of the bracket. The support leg 10 extends to a set height to form stable support. This folding mechanism achieves form transformation through mechanical hinges, eliminating the need to disassemble bolts or perform welding operations. This maintains the structural strength of the conveyor during operation while meeting the volume reduction requirements during transportation. Compared with existing technologies, traditional fixed conveyors use an integral welded frame structure that cannot be disassembled and folded, resulting in the need to occupy the entire machine space during transportation. This solution uses a segmented hinged bracket design, allowing the conveyor to be folded to one-third to one-fifth of its original length. For example, a six-segment bracket folds to only retain the thickness of two overlapping segments, significantly reducing the loading space requirements of transport vehicles. At the same time, the hinge point locking mechanism provides torsional stiffness comparable to that of a welded frame when unfolded, preventing the bracket from deforming during the operation of the conveyor belt 30. Through the above technical solution, this application achieves rapid folding and unfolding of the conveyor in the transportation state, solving the problem of soaring transportation costs caused by excessive equipment size in remote mining areas. The folded conveyor can be transported via standard containers or flatbed trucks, while maintaining the same conveying efficiency and operational stability as the fixed equipment even when the support frame is unfolded.

[0055] Furthermore, the roller system on the connecting bracket 22 includes an upper roller bracket 11 fixed above the connecting bracket 22 and an upper roller 12 rotatably positioned thereon, and a lower roller bracket 13 fixed below the connecting bracket 22 and a lower roller 14 rotatably positioned thereon.

[0056] The connecting bracket 22 is a movable component that articulates with the adjacent main support 21. Specifically, it can be implemented using a hinged metal frame structure to allow the conveyor support 20 to fold and unfold. The upper idler bracket 11 is a support structure installed on top of the connecting bracket 22, providing continuous upper support when the conveyor belt 30 is carrying materials. The lower idler bracket 13 is a constraint structure installed at the bottom of the connecting bracket 22, limiting the sagging or deviation of the conveyor belt 30 during its return stroke. When the conveyor is in operation, the connecting bracket 22 and the main support 21 are aligned in a straight line, with the upper idler bracket 11 and lower idler bracket 13 providing continuous support for the carrying and return sections of the conveyor belt 30, respectively. The upper idler 12 rotates freely with the conveyor belt 30, keeping the material stable during transport; the lower idler 14 constrains the return path of the conveyor belt 30, preventing sagging due to gravity. When folding is required for transport, the connecting bracket 22 is flipped and stacked around the hinge point. At this time, the upper idler bracket 11 and the lower idler bracket 13 are folded synchronously with the connecting bracket 22. The idler always keeps in contact with the conveyor belt 30 to prevent the conveyor belt 30 from detaching from the support surface during the folding process, which would cause local stress concentration or deformation.

[0057] like Figure 2 and 4 As shown, both the primary crushing unit 101 and the secondary crushing unit 102 are mounted on a support frame 40. The support frame 40 includes a rectangular frame 41, with diagonally arranged inter-column support rods 42 distributed at the corners of the rectangular frame 41. The support frame 40 is a modular steel structure that supports the crushing units and provides a stable installation foundation. Specifically, it can be implemented using welded or bolted steel beam frames. Its function is to provide a rigid support platform for the crushing units, preventing equipment displacement due to frame deformation during transportation. The rectangular frame 41 is a geometrically regular cuboid frame composed of crossbeams 43 and longitudinal beams 44. Specifically, it can be implemented using H-beams or square steel tubes connected by bolts. Its function is to improve frame assembly efficiency through standardized structural design and enhance overall torsional resistance. The inter-column support rods 42 are used to diagonally support the rectangular frame 41, increasing the strength of the rectangular frame 41.

[0058] Specifically, the primary crushing unit 101 and the secondary crushing unit 102 are integrated and installed on a rectangular frame 41 composed of crossbeams 43 and longitudinal beams 44, forming independent functional modules. At the four corners of the frame, diagonally installed inter-column support rods 42 connect adjacent crossbeams 43 and longitudinal beams 44, forming a triangular support structure. When the vibration energy generated during the operation of the crushing unit is transmitted to the corners through the support frame 40, the inter-column support rods 42 enhance the strength of the rectangular frame 41 and reduce the stress peak at the frame connections.

[0059] Furthermore, the rectangular frame 41 is formed by bolting together multiple horizontal beams 43 and vertical beams 44.

[0060] The horizontal beam 43 refers to the horizontally extending support member, which can be made of I-beams or square steel. Its length can be adjusted according to the size of the crushing unit, and it is used to construct the lateral support structure of the frame. The vertical beam 44 refers to the vertically extending support member, which can be made of channel steel or H-beams. It is arranged intersecting with the horizontal beam 43 to form a grid structure, which is used to enhance the frame's torsional resistance. Bolted connection refers to the connection of components through threaded fasteners, specifically high-strength hexagonal bolts with anti-loosening washers, so that the horizontal beam 43 and the vertical beam 44 form a detachable rigid connection at the joints. Specifically, the horizontal beam 43 and the vertical beam 44 form a three-dimensional grid structure through intersecting arrangement, and are fastened with bolts at the joints, replacing the traditional welding process. When the frame needs to be disassembled, the horizontal beam 43 and the vertical beam 44 can be separated into independent components by removing the bolts, and can be stacked during transportation to reduce space occupation. At the installation site, the overall rigidity of the frame can be restored by tightening the bolts, avoiding installation accuracy deviations caused by welding deformation. This structure ensures support strength while enabling rapid assembly and disassembly of the support frame 40 for the crushing unit and screening unit 103.

[0061] Through the above technical solutions, this application achieves the disassembly, transportation, and rapid assembly of the support frame 40, solving the transportation inconvenience caused by the fixed volume of traditional frames. The standardized design of the crossbeams 43 and longitudinal beams 44 reduces the complexity of component processing, and the bolted connection method reduces the reliance on special equipment for on-site construction, improving the efficiency of production line deployment. The independent members formed after the frame is disassembled can flexibly adapt to different crushing unit sizes, enhancing the modular expansion capability of the production line.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A modular, high-efficiency deployment production line for sand and gravel aggregates, characterized in that: include Vibrating feeder (201), primary crushing unit (101), secondary crushing unit (102), screening unit (103), transfer conveyor (202) and multiple discharge conveyors (203); - The output end of the vibrating feeder (201) is connected to the input end of the primary crushing unit (101); - The output end of the primary crushing unit (101) is connected to the input end of the screening unit (103) via a transfer conveyor (202); - The oversize outlet of the screening unit (103) is connected to the input end of the secondary crushing unit (102), and the undersize outlet corresponds to multiple feeding conveyors (203); The output end of the secondary crushing unit (102) is connected to the transfer conveyor (202) to form a circulating crushing loop.

2. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 1, characterized in that: The primary crushing unit (101) adopts a jaw crusher or a gyratory crusher; The secondary crushing unit (102) adopts a cone crusher or an impact crusher.

3. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 1, characterized in that: The transfer conveyor (202) includes a first conveyor (202a) and a second conveyor (202b); - The output end of the primary crushing unit (101) is connected to the input end of the screening unit (103) via the first conveyor (202a); - The output end of the secondary crushing unit (102) is connected to the input end of the screening unit (103) via the first conveyor (202a); The oversize outlet of the screening unit (103) is connected to the input of the secondary crushing unit (102) via a second conveyor (202b).

4. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 3, characterized in that: The first conveyor (202a), the second conveyor (202b) and the multiple feeding conveyors (203) are all configured to feed in an upward inclined direction from the beginning to the end.

5. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 4, characterized in that: Each conveyor includes multiple legs (10), a conveyor frame (20), and a conveyor belt (30); - The conveyor support (20) is composed of multiple main support sections (21) and hinged connecting supports (22) that connect adjacent main support sections (21); -The main support (21) can be flipped and stacked around the hinge point to achieve folding.

6. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 5, characterized in that: It also includes a roller system mounted on the connecting bracket (22): - The upper roller bracket (11) is fixed above the connecting bracket (22), and the upper roller (12) is rotated and positioned on it; - The lower roller bracket (13) is fixed below the connecting bracket (22), and the lower roller (14) is rotated and positioned on it.

7. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 1, characterized in that: The primary crushing unit (101) and the secondary crushing unit (102) are both mounted on the support frame (40); - The support frame (40) includes a rectangular frame (41); - The diagonally arranged intercolumnar support rods (42) are distributed at the corners of the rectangular frame (41).

8. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 7, characterized in that: The rectangular frame (41) is formed by bolting together multiple horizontal beams (43) and vertical beams (44).

9. The modular sand and gravel aggregate high-efficiency deployment production line according to claim 1, characterized in that: Multiple feeding conveyors (203) receive undersize materials of different diameters from the screening unit (103).

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