Sandstone aggregate production line capable of adjusting proportion and quality of finished aggregate
By introducing components such as sand making bins, feeders, sand making machines, and vibrating screens into the sand and gravel aggregate production line, the proportion and quality of finished aggregates can be adjusted, solving the problem of high demand for manufactured sand and excessive fineness modulus in the water conservancy and hydropower industry, and improving the economic efficiency of the production line.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY CONSTR HEAVY IND
- Filing Date
- 2025-05-26
- Publication Date
- 2026-06-19
AI Technical Summary
Existing sand and gravel aggregate production lines cannot meet the high demand for manufactured sand for hydraulic concrete in the water conservancy and hydropower industry, and the manufactured sand produced has excessive fineness modulus and low wet sand powder content, resulting in reduced economic efficiency.
By adding sand-making silos, feeders, sand-making machines, vibrating screens, and conveying components to the sand and gravel aggregate production line, including material transfer, feeding, crushing, and screening conveyor units, the proportion and quality of finished aggregates can be adjusted, excess crushed stone can be repeatedly crushed to make sand, the fineness modulus of manufactured sand can be adjusted, and the powder content of wet sand can be increased.
This has increased the production capacity of manufactured sand, met the needs of the water conservancy and hydropower industry, solved the problems of excessive fineness modulus of manufactured sand and low powder content of wet sand, and improved economic benefits.
Smart Images
Figure CN224371616U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of sand and gravel aggregate production lines, specifically to a sand and gravel aggregate production line with adjustable finished aggregate ratio and quality. Background Technology
[0002] The main processes of a sand and gravel aggregate production line include feeding, crushing, screening, conveying, sand making, and dust removal. The main working principle is to use vibrating feeders to evenly transport the sand and gravel raw materials to be crushed from the silo into the crusher. After two or three stages of crushing, the crushed sand and gravel are screened into the required finished aggregates by a vibrating screen and then conveyed to the corresponding silos to achieve the purpose of adjusting the production ratio of aggregates and manufactured sand to meet the needs of engineering construction.
[0003] However, due to limitations in raw material characteristics and crushing equipment performance, existing sand and gravel aggregate production lines produce relatively fixed proportions of manufactured sand and various types of crushed stone, which cannot meet the high demand for manufactured sand in hydraulic concrete from the water conservancy and hydropower industry. Furthermore, existing sand and gravel aggregate production lines produce excessive amounts of crushed stone, leading to difficulties in consumption. Additionally, existing sand and gravel aggregate production lines often produce manufactured sand with excessive fineness modulus and wet sand with low powder content, resulting in reduced economic efficiency in actual use.
[0004] In summary, it is necessary to add a new type of sand and gravel aggregate production line with adjustable finished aggregate ratio and quality to the existing sand and gravel aggregate production line, based on the overall processing capacity of the existing production line. This would solve the problem of excessive crushed stone and insufficient manufactured sand production in the existing sand and gravel aggregate production line, as well as the problem of the fineness modulus requirements of manufactured sand for hydraulic concrete in the water conservancy and hydropower industry, and the problem of low powder content in the wet sand produced by the existing sand and gravel aggregate production line. Utility Model Content
[0005] The purpose of this utility model is to provide a sand and gravel aggregate production line with adjustable finished aggregate ratio and quality. The specific technical solution is as follows:
[0006] A sand and gravel aggregate production line with adjustable finished aggregate ratio and quality includes a sand making silo, a feeder, a sand making machine, a vibrating screen, and conveying components.
[0007] The conveying assembly includes a transfer conveyor unit, a feeding conveyor unit, a crushing conveyor unit, and a screening conveyor unit. The receiving end of the transfer conveyor unit is connected to the discharge port of the existing sand and gravel aggregate production line, while its discharge end is connected to the inlet of the sand making silo. The receiving end of the feeding conveyor unit is connected to the discharge port of the sand making silo via the feeder, while its discharge end is connected to the inlet of the sand making machine. The receiving end of the crushing conveyor unit is connected to the discharge port of the sand making machine, while its discharge end is connected to the inlet of the vibrating screen. The receiving end of the screening conveyor unit is connected to the sieved discharge port of the vibrating screen, while its discharge end is connected to the third sand silo. The receiving end of the feeding conveyor unit is also connected to the unsieved discharge port of the vibrating screen.
[0008] Optionally, the material transfer conveyor unit includes a first belt conveyor, a second belt conveyor, and a third belt conveyor; the receiving end of the first belt conveyor is connected to one of the discharge ports of the existing sand and gravel aggregate production line, and its discharge end is connected to the inlet of the sand making silo via the third belt conveyor; the receiving end of the second belt conveyor is connected to the other discharge port of the existing sand and gravel aggregate production line, and its discharge end is connected to the inlet of the sand making silo via the third belt conveyor.
[0009] Optionally, the material transfer conveyor unit further includes a first distribution hopper and a second distribution hopper; the first distribution hopper is disposed on the discharge end of the first belt conveyor, and includes two first openable channels, one of which is connected to the receiving end of the third belt conveyor, and the other of which is connected to the first sand silo; the second distribution hopper is disposed on the discharge end of the second belt conveyor, and includes two second openable channels, one of which is connected to the receiving end of the third belt conveyor, and the other of which is connected to the second sand silo; the discharge end of the third belt conveyor is connected to the inlet of the sand making silo.
[0010] Optionally, the feeding conveyor unit includes a fourth belt conveyor, a fifth belt conveyor, and a sixth belt conveyor; the receiving end of the fourth belt conveyor is connected to the discharge port of the feeder, and its discharge end is connected to the receiving end of the fifth belt conveyor; the discharge end of the fifth belt conveyor is connected to the receiving end of the sixth belt conveyor; and the discharge end of the sixth belt conveyor is connected to the feed port of the sand making machine.
[0011] Optionally, the crushing conveyor unit includes a seventh belt conveyor and an eighth belt conveyor; the receiving end of the seventh belt conveyor is connected to the discharge port of the sand making machine, and its discharge end is connected to the receiving end of the eighth belt conveyor; the discharge end of the eighth belt conveyor is connected to the feed port of the vibrating screen.
[0012] Optionally, the screening and conveying unit includes a ninth belt conveyor and a tenth belt conveyor; the receiving end of the ninth belt conveyor is connected to the sieved discharge port of the vibrating screen, while its discharge end is connected to the receiving end of the tenth belt conveyor; the discharge end of the tenth belt conveyor is connected to the third sand bin; the unsieved discharge port of the vibrating screen is connected to the receiving end of the sixth belt conveyor, for conveying the unsieved sand and gravel to the sand making machine for further crushing.
[0013] Optionally, the screening conveyor unit further includes an eleventh belt conveyor and a third distribution hopper; the third distribution hopper is located at the discharge end of the tenth belt conveyor, and includes two third openable channels, one of which is connected to the receiving end of the eleventh belt conveyor, and the other of which is connected to the third sand bin; the receiving end of the eleventh belt conveyor is also connected to the wet sand discharge port of the existing sand and gravel aggregate production line, and its discharge end is connected to the wet sand bin.
[0014] Optionally, the vibrating screen includes at least two layers of screen mesh.
[0015] Optionally, the screening and conveying unit further includes a fourth distribution hopper; the fourth distribution hopper is disposed on the discharge port of the vibrating screen, and includes a plurality of fourth openable channels, the number of which is equal to the number of screen layers of the vibrating screen, and is configured to correspond one-to-one with the discharge port of each screen layer.
[0016] Optionally, the screening and conveying unit further includes a fifth distribution hopper; the fifth distribution hopper is disposed on the unscreened discharge port of the vibrating screen, and includes a plurality of fifth openable channels, the number of which is equal to the number of screen layers of the vibrating screen, and is configured to correspond one-to-one with the unscreened discharge port of each screen layer.
[0017] The application of the technical solution of this utility model has at least the following beneficial effects:
[0018] (1) This utility patent provides a sand and gravel aggregate production line with adjustable finished aggregate ratio and quality. By sending the excess crushed stone produced by the original production line into the new sand making production line for repeated crushing and sand making, the production capacity of manufactured sand is increased. At the same time, the excess crushed stone aggregate produced by the original production line is consumed, and the finished aggregate of the production line is adjustable to meet the needs of customers and the market.
[0019] (2) The present invention provides a sand and gravel aggregate production line with adjustable finished aggregate ratio and quality, which can solve the problem that the existing sand and gravel aggregate production line cannot meet the fineness modulus requirements of hydraulic concrete manufactured sand in the water conservancy and hydropower industry. Specifically, the working principle of this utility model's adjustable finished aggregate ratio and quality sand and gravel aggregate production line for adjusting the fineness modulus of manufactured sand according to actual needs is as follows: The fineness modulus of the manufactured sand conveyed by the screening conveyor unit is checked to see if it meets the customer's engineering requirements for manufactured sand (such as the fineness modulus of manufactured sand for hydraulic concrete); if the fineness modulus meets the customer's engineering requirements for manufactured sand, the manufactured sand conveyed by the screening conveyor unit is conveyed to the third sand bin; if the fineness modulus exceeds the standard, i.e., the manufactured sand is too coarse, the unscreened coarse sand in the vibrating screen is conveyed by the feeding conveyor unit to the sand making machine for further crushing, and then conveyed by the crushing conveyor unit to the vibrating screen for sieving, thereby increasing the fine sand content in the manufactured sand and achieving the purpose of adjustable fineness modulus; when the fineness modulus meets the customer's engineering requirements for manufactured sand, the manufactured sand conveyed by the screening conveyor unit is then conveyed to the third sand bin, realizing the fineness modulus adjustment function.
[0020] (3) The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality provided by this utility model can also solve the problem of low powder content in wet sand produced by existing sand and gravel aggregate production lines. Specifically, the working principle of the sand and gravel aggregate production line with adjustable finished aggregate ratio and quality in this utility model to improve the powder content of wet sand is as follows: the wet sand produced by the existing sand and gravel aggregate production line flows into the eleventh belt conveyor through the wet sand outlet; the tenth belt conveyor divides part of the manufactured sand (i.e., dry sand) to the eleventh belt conveyor through the distribution action of the third distribution hopper, and after the dry sand and wet sand are mixed, they are transported to the wet sand silo. Since the dry sand has a high powder content, after being mixed with wet sand, the powder content of the wet sand can be increased, while the moisture content of the wet sand is reduced, the filtration time is reduced, and the economic benefits are improved.
[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description
[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:
[0023] Figure 1 This is a schematic diagram of the structure of a sand and gravel aggregate production line with adjustable finished aggregate ratio and quality, as described in the embodiment.
[0024] Among them, 1. Sand making silo, 2. Feeder, 3. Sand making machine, 4. Vibrating screen, 5. Transfer conveyor unit, 5.1. First belt conveyor, 5.2. Second belt conveyor, 5.3. Third belt conveyor, 6. Feeding conveyor unit, 6.1. Fourth belt conveyor, 6.2. Fifth belt conveyor, 6.3. Sixth belt conveyor, 7. Crushed material conveyor unit, 7.1. Seventh belt conveyor, 7.2. Eighth belt conveyor, 8. Screening conveyor unit, 8.1. Ninth belt conveyor, 8.2. Tenth belt conveyor, 8.3. Eleventh belt conveyor, A. Third sand silo, B. Wet sand silo, C. First sand silo, D. Second sand silo, X. Existing sand and gravel aggregate production line. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0026] Example:
[0027] See Figure 1 A sand and gravel aggregate production line with adjustable finished aggregate ratio and quality includes a sand making silo 1, a feeder 2 (specifically a plate feeder), a sand making machine 3, a vibrating screen 4 (specifically a two-layer circular vibrating screen) and conveying components.
[0028] The conveying assembly includes a transfer conveyor unit 5, a feeding conveyor unit 6, a crushing conveyor unit 7, and a screening conveyor unit 8. The receiving end of the transfer conveyor unit 5 is connected to the discharge port of the existing sand and gravel aggregate production line X, while its discharge end is connected to the inlet of the sand making silo 1. The receiving end of the feeding conveyor unit 6 is connected to the discharge port of the sand making silo 1 via the feeder 2, while its discharge end is connected to the inlet of the sand making machine 3. The receiving end of the crushing conveyor unit 7 is connected to the discharge port of the sand making machine 3, while its discharge end is connected to the inlet of the vibrating screen 4. The receiving end of the screening conveyor unit 8 is connected to the sieved discharge port of the vibrating screen 4, while its discharge end is connected to the third sand bin. The receiving end of the feeding conveyor unit 6 is also connected to the unsieved discharge port of the vibrating screen 4.
[0029] The material transfer conveyor unit 5 includes a first belt conveyor 5.1, a second belt conveyor 5.2, and a third belt conveyor 5.3. The receiving end of the first belt conveyor 5.1 is connected to one of the discharge ports of the existing sand and gravel aggregate production line X (such as a sand and gravel discharge port with a particle size of 20-40mm), and its discharge end is connected to the inlet of the sand making silo 1 via the third belt conveyor 5.3. The receiving end of the second belt conveyor 5.2 is connected to the other discharge port of the existing sand and gravel aggregate production line X (such as a sand and gravel discharge port with a particle size of 5-20mm), and its discharge end is connected to the inlet of the sand making silo 1 via the third belt conveyor 5.3.
[0030] The material transfer conveyor unit 5 further includes a first distribution hopper and a second distribution hopper; the first distribution hopper is located at the discharge end of the first belt conveyor 5.1, and includes two first openable channels, one of which is connected to the receiving end of the third belt conveyor 5.3, and the other of which is connected to the first sand silo C; the second distribution hopper is located at the discharge end of the second belt conveyor 5.2, and includes two second openable channels, one of which is connected to the receiving end of the third belt conveyor 5.3, and the other of which is connected to the second sand silo D; the discharge end of the third belt conveyor 5.3 is connected to the inlet of the sand making silo 1.
[0031] The feeding conveyor unit 6 includes a fourth belt conveyor 6.1, a fifth belt conveyor 6.2, and a sixth belt conveyor 6.3; the receiving end of the fourth belt conveyor 6.1 is connected to the discharge port of the feeder 2, and its discharge end is connected to the receiving end of the fifth belt conveyor 6.2; the discharge end of the fifth belt conveyor 6.2 is connected to the receiving end of the sixth belt conveyor 6.3; and the discharge end of the sixth belt conveyor 6.3 is connected to the feed port of the sand making machine 3.
[0032] The crushing conveyor unit 7 includes a seventh belt conveyor 7.1 and an eighth belt conveyor 7.2; the receiving end of the seventh belt conveyor 7.1 is connected to the discharge port of the sand making machine 3, and its discharge end is connected to the receiving end of the eighth belt conveyor 7.2; the discharge end of the eighth belt conveyor 7.2 is connected to the feed port of the vibrating screen 4.
[0033] The screening and conveying unit 8 includes a ninth belt conveyor 8.1 and a tenth belt conveyor 8.2; the receiving end of the ninth belt conveyor 8.1 is connected to the sieved discharge port of the vibrating screen 4, while its discharge end is connected to the receiving end of the tenth belt conveyor 8.2; the discharge end of the tenth belt conveyor 8.2 is connected to the third sand bin A; the unscreened discharge port of the vibrating screen 4 (such as the discharge port for manufactured sand with a particle size greater than 5mm and the discharge port for manufactured sand with a particle size greater than 3mm) is connected to the receiving end of the sixth belt conveyor 6.3, for conveying the unscreened sand and gravel to the sand making machine 3 for further crushing.
[0034] The screening and conveying unit 8 also includes an eleventh belt conveyor 8.3 and a third distribution hopper; the third distribution hopper is located at the discharge end of the tenth belt conveyor 8.2, and includes two third openable channels, one of which is connected to the receiving end of the eleventh belt conveyor 8.3, and the other is connected to the third sand bin A; the receiving end of the eleventh belt conveyor 8.3 is also connected to the wet sand discharge port (such as the wet sand discharge port with a particle size of less than 5mm) of the existing sand and gravel aggregate production line X, and its discharge end is connected to the wet sand bin B.
[0035] The screening and conveying unit 8 further includes a fourth distribution hopper; the fourth distribution hopper is located on the discharge port of the vibrating screen 4, and includes two fourth openable channels. The number of fourth openable channels is equal to the number of screen layers of the vibrating screen 4, and corresponds one-to-one with the discharge port of each screen layer. Specifically, one of the fourth openable channels corresponds to the discharge port of the upper screen of the vibrating screen 4 (e.g., the discharge port of manufactured sand with a particle size of 3-5mm), while the other fourth openable channel corresponds to the discharge port of the lower screen of the vibrating screen 4 (e.g., the discharge port of manufactured sand with a particle size less than 3mm).
[0036] The screening and conveying unit 8 also includes a fourth distribution hopper; the fifth distribution hopper is located on the unscreened discharge port of the vibrating screen 4, and includes two fifth openable channels. The number of fifth openable channels is equal to the number of screen layers of the vibrating screen 4, and corresponds one-to-one with the unscreened discharge port of each screen layer. Specifically, one of the fifth openable channels corresponds to the unscreened discharge port of the upper screen of the vibrating screen 4 (e.g., the discharge port of manufactured sand with a particle size greater than 5mm), while the other fifth openable channel corresponds to the unscreened discharge port of the lower screen of the vibrating screen 4 (e.g., the discharge port of manufactured sand with a particle size greater than 3mm).
[0037] In this embodiment, the first, second, third, fourth, and fifth openable channels are configured as follows: an openable baffle is installed in the channel to form an openable channel; wherein, the configuration of the openable baffle includes opening a mounting hole on the channel for baffle insertion, and the channel is opened and closed by manually inserting or removing the baffle or by electrically inserting or removing the baffle (such as by inserting or removing the baffle with an electric push rod).
[0038] Existing sand and gravel aggregate production line X, due to limitations in raw material characteristics and crushing equipment performance, produces manufactured sand and various types of crushed stone with relatively fixed proportions, which cannot meet the high demand for manufactured sand in hydraulic concrete from the water conservancy and hydropower industry. The operating principle of this embodiment, which utilizes an adjustable finished aggregate ratio and quality sand and gravel aggregate production line to increase manufactured sand production capacity according to actual needs, is as follows:
[0039] The excess crushed stone produced in the original production line (i.e., the existing sand and gravel aggregate production line X) is fed into the new sand making production line (i.e., the sand and gravel aggregate production line with adjustable finished aggregate ratio and quality) for repeated crushing and sand making, thereby increasing the output of manufactured sand in the production system and consuming the excess crushed stone.
[0040] In response to the issue of existing sand and gravel aggregate production lines producing manufactured sand with excessively high fineness modulus, this embodiment employs a sand and gravel aggregate production line with adjustable finished aggregate ratio and quality. The operating principle of this line, based on actual needs, is as follows:
[0041] The fineness modulus of the manufactured sand conveyed by the screening conveyor unit 8 is checked to see if it meets the requirements of the customer's engineering manufactured sand (such as the fineness modulus of manufactured sand for hydraulic concrete). If the fineness modulus meets the requirements of the customer's engineering manufactured sand, the manufactured sand conveyed by the screening conveyor unit 8 is conveyed to the third sand bin A. If the fineness modulus exceeds the standard, that is, the manufactured sand is too coarse, the coarse sand that has not been screened in the vibrating screen 4 is conveyed by the feeding conveyor unit 6 to the sand making machine 3 for further crushing, and then conveyed by the crushing conveyor unit 7 to the vibrating screen 4 for screening, thereby increasing the fine sand content in the manufactured sand and achieving the purpose of adjustable fineness modulus. When the fineness modulus meets the requirements of the customer's engineering manufactured sand, the manufactured sand conveyed by the screening conveyor unit 8 is then conveyed to the third sand bin A.
[0042] Existing sand and gravel aggregate production lines often produce wet sand with a low powder content, leading to reduced economic efficiency in actual use. The operational principle of this embodiment, which utilizes an adjustable finished aggregate ratio and quality, to improve the powder content of wet sand is as follows:
[0043] The wet sand produced by the existing sand and gravel aggregate production line X flows into the eleventh belt conveyor 8.3 through the wet sand outlet. The tenth belt conveyor 8.2, through the distribution action of the third distribution hopper, diverts part of the manufactured sand (i.e., dry sand) to the eleventh belt conveyor 8.3. The dry sand and wet sand are mixed and then transported to the wet sand silo B. Since the dry sand has a high powder content, mixing it with the wet sand can increase the powder content of the wet sand, while reducing the moisture content of the wet sand, reducing the filtration time, and improving economic efficiency.
[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A sand and gravel aggregate production line with adjustable finished aggregate ratio and quality, characterized in that, It includes a sand making silo (1), a feeder (2), a sand making machine (3), a vibrating screen (4), and a conveying assembly; The conveying assembly includes a transfer conveyor unit (5), a feeding conveyor unit (6), a crushing conveyor unit (7), and a screening conveyor unit (8); the receiving end of the transfer conveyor unit (5) is connected to the discharge port of the existing sand and gravel aggregate production line, while its discharge end is connected to the inlet of the sand making silo (1); the receiving end of the feeding conveyor unit (6) is connected to the discharge port of the sand making silo (1) via the feeder (2), while its discharge end is connected to... The feed inlet of the sand making machine (3) is connected; the receiving end of the crushing conveyor group (7) is connected to the discharge outlet of the sand making machine (3), and its discharge end is connected to the feed inlet of the vibrating screen (4); the receiving end of the screening conveyor group (8) is connected to the sieved discharge outlet of the vibrating screen (4), and its discharge end is connected to the third sand bin; the receiving end of the feeding conveyor group (6) is also connected to the unsieved discharge outlet of the vibrating screen (4).
2. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 1, characterized in that, The material transfer conveyor unit (5) includes a first belt conveyor (5.1), a second belt conveyor (5.2), and a third belt conveyor (5.3); the receiving end of the first belt conveyor (5.1) is connected to one of the discharge ports of the existing sand and gravel aggregate production line, and its discharge end is connected to the inlet of the sand making silo (1) via the third belt conveyor (5.3); the receiving end of the second belt conveyor (5.2) is connected to the other discharge port of the existing sand and gravel aggregate production line, and its discharge end is connected to the inlet of the sand making silo (1) via the third belt conveyor (5.3).
3. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 2, characterized in that, The material transfer conveyor unit (5) further includes a first material distribution hopper and a second material distribution hopper; the first material distribution hopper is set on the discharge end of the first belt conveyor (5.1), and includes two first openable channels, one of which is connected to the receiving end of the third belt conveyor (5.3), and the other is connected to the first sand bin; the second material distribution hopper is set on the discharge end of the second belt conveyor (5.2), and includes two second openable channels, one of which is connected to the receiving end of the third belt conveyor (5.3), and the other is connected to the second sand bin; the discharge end of the third belt conveyor (5.3) is connected to the inlet of the sand making bin (1).
4. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to any one of claims 1 to 3, characterized in that, The feeding conveyor unit (6) includes a fourth belt conveyor (6.1), a fifth belt conveyor (6.2), and a sixth belt conveyor (6.3); the receiving end of the fourth belt conveyor (6.1) is connected to the discharge port of the feeder (2), and its discharge end is connected to the receiving end of the fifth belt conveyor (6.2); the discharge end of the fifth belt conveyor (6.2) is connected to the receiving end of the sixth belt conveyor (6.3); and the discharge end of the sixth belt conveyor (6.3) is connected to the inlet of the sand making machine (3).
5. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 4, characterized in that, The crushing conveyor unit (7) includes a seventh belt conveyor (7.1) and an eighth belt conveyor (7.2); the receiving end of the seventh belt conveyor (7.1) is connected to the discharge port of the sand making machine (3), and its discharge end is connected to the receiving end of the eighth belt conveyor (7.2); the discharge end of the eighth belt conveyor (7.2) is connected to the feed port of the vibrating screen (4).
6. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 5, characterized in that, The screening and conveying unit (8) includes a ninth belt conveyor (8.1) and a tenth belt conveyor (8.2); the receiving end of the ninth belt conveyor (8.1) is connected to the sieved discharge port of the vibrating screen (4), and its discharge end is connected to the receiving end of the tenth belt conveyor (8.2); the discharge end of the tenth belt conveyor (8.2) is connected to the third sand bin; the unsieved discharge port of the vibrating screen (4) is connected to the receiving end of the sixth belt conveyor (6.3), which is used to transport the unsieved sand and gravel to the sand making machine (3) for further crushing.
7. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 6, characterized in that, The screening and conveying unit (8) also includes an eleventh belt conveyor (8.3) and a third distribution hopper; the third distribution hopper is located on the discharge end of the tenth belt conveyor (8.2), and includes two third openable channels, one of which is connected to the receiving end of the eleventh belt conveyor (8.3), and the other is connected to the third sand bin; the receiving end of the eleventh belt conveyor (8.3) is also connected to the wet sand discharge port of the existing sand and gravel aggregate production line, and its discharge end is connected to the wet sand bin.
8. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 7, characterized in that, The vibrating screen (4) includes at least two layers of screen mesh.
9. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 8, characterized in that, The screening and conveying unit (8) also includes a fourth distribution hopper; the fourth distribution hopper is set on the discharge port of the vibrating screen (4), and includes a plurality of fourth openable channels. The number of the fourth openable channels is equal to the number of screen layers of the vibrating screen (4), and is set one-to-one with the discharge port of each screen layer.
10. The sand and gravel aggregate production line with adjustable finished aggregate ratio and quality according to claim 9, characterized in that, The screening and conveying unit (8) also includes a fifth distribution hopper; the fifth distribution hopper is set on the unscreened discharge port of the vibrating screen (4), and includes multiple fifth openable channels. The number of the fifth openable channels is equal to the number of screen layers of the vibrating screen (4), and is set one-to-one with the unscreened discharge port of each screen layer.