A sandstone processing device and method

Abstract

The application discloses a sandstone processing device and method, relates to the technical field of sand making devices, and mainly aims to solve the problems of insufficient medium diameter of large stones and over-standard small stone diameter in a sand making process. The sandstone processing device mainly comprises a first crusher, a first vibrating screen, a second crusher, a third crusher and a second vibrating screen. The second crusher is added. The semi-finished product after being crushed by the first crusher is fed into the second crusher to be reshaped and crushed, the yield of large stones is increased, the content of needle-shaped large stones is reduced by using the reshaping effect of the second crusher, the problems of insufficient medium diameter of large stones and over-standard small stone diameter are solved, the content of fine particles is increased, and the yield of finished sand is improved.

Description

Technical Field

[0001] This invention relates to the field of sand making equipment technology, and in particular to a sand and gravel processing device and method. Background Technology

[0002] Sand making technology is a process of crushing large rocks or ores into smaller particles, known as sand and gravel. Current sand making technologies typically use crushers to break down large rocks or ores to achieve the desired particle size. In addition, some sand making technologies employ both dry and wet methods to meet different application requirements. However, existing sand making technologies still have some problems in practical applications. First, the sand and gravel obtained from a single crushing operation often contains large stones with insufficient diameter and small stones with excessive diameter, which not only affects the quality of the sand and gravel but also production efficiency. Second, current sand making technologies often produce insufficient fine sand, resulting in insufficient finished sand output. Summary of the Invention

[0003] To address the above shortcomings, this invention provides a sand and gravel processing device and method that can solve the problems of insufficient medium diameter of large stones and excessive under-diameter of small stones in existing sand and gravel processing devices.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A sand and gravel processing device, comprising: First crusher; The first belt conveyor is located below the discharge end of the first crusher and receives the sand and gravel crushed by the first crusher. The first vibrating screen is located below the end of the first belt conveyor; the first vibrating screen is equipped with three sizes of screen mesh. The second belt conveyor is located at the discharge end of the first vibrating screen and is used to receive sand and gravel that fail to pass through the largest screen of the first vibrating screen and / or to receive sand and gravel that pass through the largest screen of the first vibrating screen but fail to pass through the second largest screen of the first vibrating screen. The third belt conveyor receives the sand and gravel from the second belt conveyor. The material discharge end of the third belt conveyor is equipped with a double-pass hopper, through which the material is fed into the first crusher and / or into the fourth belt conveyor. The second crusher receives and crushes the sand and gravel from the fourth belt conveyor, and the discharge end of the second crusher is located above the first belt conveyor. The sixth belt conveyor, located at the discharge end of the first vibrating screen, is used to receive sand and gravel that pass through the largest screen of the first vibrating screen but fail to pass through the second largest screen of the first vibrating screen. The seventh belt conveyor is located at the discharge end of the first vibrating screen and is used to receive sand and gravel that have passed through the second largest size screen of the first vibrating screen but have failed to pass through the smallest size screen of the first vibrating screen. The third crusher receives and crushes the sand and gravel from the seventh belt conveyor. The second vibrating screen receives and screens the sand and gravel crushed by the third crusher.

[0005] Furthermore, the second vibrating screen is equipped with three sizes of screen mesh, and the sand and gravel that fail to pass through the largest size screen of the second vibrating screen can be transported to the third crusher by the seventh belt conveyor.

[0006] Furthermore, the sand and gravel processing device also includes: The fourth crusher receives and crushes sand and gravel that pass through the largest screen of the second vibrating screen but fail to pass through the second largest screen of the second vibrating screen. The third vibrating screen receives and screens the sand and gravel crushed by the fourth crusher; and The third vibrating screen is equipped with two sizes of screen mesh, and the fourth crusher can also accept sand and gravel that fail to pass through the smallest size screen mesh of the third vibrating screen.

[0007] Furthermore, the sand and gravel processing device also includes: The integrated sand washing and recycling machine is used to accept the smallest size of sand and gravel that has passed through the first and second vibrating screens. The eighth belt conveyor is used to receive sand and gravel of the smallest size that has passed through the first and second vibrating screens and / or sand and gravel that has been washed by the integrated sand washing and recycling machine. The ninth belt conveyor receives the sand and gravel from the eighth belt conveyor, and the ninth belt conveyor is a bidirectional transmission mode.

[0008] Furthermore, the sand and gravel processing device also includes: The integrated sand washing and recycling machine is used to accept the smallest size of sand and gravel that has passed through the first and second vibrating screens. The eighth belt conveyor is used to receive sand and gravel of the smallest size that has passed through the first and second vibrating screens and / or sand and gravel that has been washed by the integrated sand washing and recycling machine. The ninth belt conveyor receives sand and gravel from the eighth belt conveyor and / or receives the smallest size of sand and gravel passing through the third vibrating screen. The ninth belt conveyor is a bidirectional transmission mode.

[0009] Furthermore, the sand and gravel processing device also includes a fourth vibrating screen, a tenth belt conveyor, and an eleventh belt conveyor; The tenth belt conveyor receives sand and gravel that passes through the largest screen of the second vibrating screen but fails to pass through the second largest screen of the second vibrating screen; the tenth belt conveyor is equipped with a double-pass hopper, one of which is fed into the fourth crusher as finished product via the twenty-fifth belt conveyor or via the twenty-fourth belt conveyor, and the other is connected to the fourth vibrating screen; The eleventh belt conveyor is used to receive sand and gravel that fail to pass through the smallest screen of the fourth vibrating screen and feed them into the fourth crusher.

[0010] Furthermore, the sand and gravel processing device also includes a twelfth belt conveyor, which is capable of receiving sand and gravel that fails to pass through the largest screen of the second vibrating screen and conveying it into the fourth crusher for crushing.

[0011] Furthermore, the sand and gravel processing device also includes a first feeder, a soil removal screen, a fifth crusher, and a second feeder; The fifth crusher receives and crushes raw materials that have not passed through the first feeder; The soil removal screen receives the raw material passing through the first feeder and removes impurities; The second feeder receives the raw materials crushed by the fifth crusher and the raw materials removed by the soil removal screen and transports them to the first crusher and / or the second crusher.

[0012] Furthermore, the sand and gravel processing device also includes a third feeder, which is used to feed the third crusher.

[0013] Furthermore, the sand and gravel processing device also includes a fourth feeder, which is used to feed the fourth crusher.

[0014] Furthermore, an angle sensor is provided above the second, sixth, and seventh belt conveyors. The angle sensor is equipped with a baffle facing the second, sixth, or seventh belt conveyor and is capable of detecting the angle of the baffle.

[0015] The present invention also includes a sand and gravel processing method, characterized in that the method uses the above-mentioned sand and gravel processing apparatus and includes the following steps: S1. The material is conveyed to the first crusher or the second crusher via the third belt conveyor for crushing. The crushed sand and gravel are then fed into the first vibrating screen via the first belt conveyor for screening. Sand and gravel that fail to pass through the largest screen size of the first vibrating screen are re-fed into the first crusher or the second crusher for further crushing. Sand and gravel that pass through the largest screen of the first vibrating screen but fail to pass through the second largest screen of the first vibrating screen are re-fed into the first or second crusher for further crushing or as finished large stones. Sand and gravel passing through the smallest screen of the first vibrating screen are treated as dry sand or as wet sand by the integrated sand washing and recycling machine. S2. Sand and gravel that pass through the second largest screen of the first vibrating screen but fail to pass through the smallest screen of the first vibrating screen are fed into the third crusher for crushing. The crushed sand and gravel are then fed into the second vibrating screen for screening. Sand and gravel that fail to pass through the largest screen of the second vibrating screen are fed back into the third crusher for crushing or used as intermediates in the finished product. Sand and gravel that failed to pass through the second largest screen of the second vibrating screen but not the smallest screen of the second vibrating screen are fed back into the third crusher for further crushing. The crushed sand and gravel are then fed back into the second vibrating screen for further screening. Sand and gravel passing through the smallest screen of the second vibrating screen are either dry sand or wet sand passing through the integrated sand washing and recycling machine. Sand and gravel that pass through the largest screen of the second vibrating screen but fail to pass through the second largest screen of the second vibrating screen are used as finished small stones.

[0016] Compared with the prior art, the beneficial effects of the present invention are: by adding a second crusher, the material or semi-finished material after being crushed by the first crusher enters the second crusher for shaping and crushing, thereby increasing the output of large stones, and by utilizing the shaping effect of the second crusher which is an impact crusher, reducing the content of needle-like and flaky large stones, thereby solving the problems of insufficient medium diameter of large stones and excessive undersized small stones, while increasing the content of fine particles and increasing the output of finished sand. This invention improves sand production by setting up a fourth crusher and a third vibrating screen, and by feeding the produced medium and small stones as raw materials into the fourth crusher and the third vibrating screen for crushing and screening. By sending a portion of medium-sized and small stones to the fourth crusher for crushing and sand making, the crushed material is fed into the third vibrating screen for screening. Larger-sized materials are fed into the fourth crusher for circulating crushing and sand making. The undersized materials are fed into the finished sand bin via a belt conveyor. Intermediate materials can be fed into the fourth crusher for circulating crushing and sand making, or a portion can be sent into the sand bin as finished sand according to the fineness modulus of the manufactured sand. Through the above settings, the output of manufactured sand can be increased to meet the demand for manufactured sand during peak periods. This invention can also solve the problem that small stones and pebbles cannot be produced at the same time. The hopper of the tenth belt conveyor is changed to a two-way type, so that some materials enter the fourth vibrating screen through the belt conveyor, the undersize material enters the pebbles pile, and the oversize material is sent to the fourth crusher through the belt conveyor for crushing and sand making. This invention can also adjust the content of sand and gravel powder. By using water-washed sand, the problem of excessive stone powder content can be addressed. At the same time, in terms of process, part of the finished sand diversion portion of the newly added sand production line is mixed into the wet sand conveyor belt, and the sand is evenly mixed and dispersed synchronously, thus solving the problem of low finished sand and gravel powder content after water washing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the sand and gravel processing device of the present invention (the arrow in the figure indicates the material conveying direction). Figure 2 This is a partial structural schematic diagram of the sand and gravel processing device of the present invention (the arrow in the figure indicates the material conveying direction). Figure 3 This is a partial structural schematic diagram of the sand and gravel processing device of the present invention (the arrow in the figure indicates the material conveying direction). Figure 4 This is a partial structural schematic diagram of the sand and gravel processing device of the present invention (the arrow in the figure indicates the material conveying direction). Figure 5 This is a partial structural schematic diagram of the sand and gravel processing device of the present invention (the arrow in the figure indicates the material conveying direction). Figure 6 This is a partial structural schematic diagram of the sand and gravel processing device of the present invention (the arrow in the figure indicates the material conveying direction). Figure 7 This is a schematic diagram of the angle sensor and baffle of the sand and gravel processing device of the present invention.

[0019] The markings shown in the diagram are as follows: 1-First crusher; 2-First belt conveyor; 3-First vibrating screen; 4-Second belt conveyor; 5-Third belt conveyor; 6-Fourth belt conveyor; 7-Fifth belt conveyor; 8-Second crusher; 9-Sixth belt conveyor; 10-Seventh belt conveyor; 11-Third crusher; 12-Second vibrating screen; 13-Fourth crusher; 14-Third vibrating screen; 15-Integrated sand washing and recycling machine; 16-Eighth belt conveyor; 17-Ninth belt conveyor. Belt conveyors; 18-Fourth vibrating screen; 19-Tenth belt conveyor; 20-Eleventh belt conveyor; 21-Twelfth belt conveyor; 22-First feeder; 23-Soil removal screen; 24-Fifth crusher; 25-Second feeder; 26-Third feeder; 27-Fourth feeder; 28-Thirteenth belt conveyor; 29-Fourteenth belt conveyor; 30-Waste soil pile; 31-Fifteenth belt conveyor; 32-Sixteenth belt conveyor; 33-Buffer yard; 34-Seventeenth belt conveyor Belt conveyor; 35-First bag filter; 36-Eighteenth belt conveyor; 37-Nineteenth belt conveyor; 38-Large stone pile; 39-Twentieth belt conveyor; 40-Twenty-first belt conveyor; 41-Twenty-second belt conveyor; 42-Twenty-third belt conveyor; 43-Medium stone pile; 44-Twenty-fourth belt conveyor; 45-Small stone pile; 46-Pebble pile; 47-Twenty-fifth belt conveyor; 48-Twenty-sixth belt conveyor; 49-Twenty-seventh belt conveyor; 50-Second Belt conveyor 18; Belt conveyor 29; Belt conveyor 30; Wet sand pile; Dry sand pile; Belt conveyor 31; Belt conveyor 32; Belt conveyor 33; Belt conveyor 34; Belt conveyor 35; Wet sand pile; Dry sand pile; Belt conveyor 36; Belt conveyor 37; Belt conveyor 38; Belt conveyor 34; Belt conveyor 35; Belt conveyor 36; Belt conveyor 37; Second bag filter; Third bag filter; Angle sensor; Baffle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 invention 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 invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Please refer to Figures 1 to 7 A preferred embodiment of the present invention provides a sand and gravel processing device, which mainly includes a first crusher 1, a first vibrating screen 3, a second crusher 8, a third crusher 11, a second vibrating screen 12, a fourth crusher 13, a third vibrating screen 14, a sand washing and recycling integrated machine 15, a fourth vibrating screen 18, a first feeder 22, a soil removal screen 23, a fifth crusher 24, a second feeder 25, a third feeder 26 and a fourth feeder 27, and various belt conveyors.

[0024] Raw materials are fed from the raw material silo into the first feeder 22, which is a bar feeder. The front end of the first feeder 22 is equipped with bars. Materials smaller than the bar spacing pass through the bars and enter the thirteenth belt conveyor 28. The materials then enter the soil removal screen 23 for mud removal. The soil removal screen outputs two types of materials: those larger than 10mm and those smaller than 10mm (the screen size can be adjusted on-site according to the mud content, such as to 5mm). Materials smaller than 10mm pass through the waste soil pile 30 for impurity removal. Materials larger than 10mm pass through the fifteenth belt conveyor 31 and the sixteenth belt conveyor 32 and enter the buffer stockpile 33. Materials larger than the bar spacing pass through the bars and enter the fifth crusher 24, which is a jaw crusher. The materials crushed by the fifth crusher 24 pass through the sixteenth belt conveyor 32 and enter the buffer stockpile 33. The second feeder 25 is a vibrating feeder that feeds the materials in the buffer stockpile 33 into the first crusher 1 via the seventeenth belt conveyor 34. The first feeder 22 and the fifth crusher 24 are dusted by the first bag filter 35. The material screened by the soil removal screen 23 is first sent to the buffer stockpile 33 by the fifteenth belt conveyor 31 and the sixteenth belt conveyor 32, and then sent to the first crusher 1 and / or the second crusher 8 by the second feeder 25 and the seventeenth belt conveyor 34 for medium crushing. During the process, iron is removed by the iron separator to ensure that all the material entering the medium crushing passes through the iron separator, reduce the probability of iron entering the medium crushing main unit, and realize independent control of the coarse crushing system and the medium crushing.

[0025] The third conveyor belt 5 receives the sand and gravel fed by the seventeenth conveyor belt 34. At this time, the sand and gravel from the seventeenth conveyor belt 34 first enters the third conveyor belt 5. Simultaneously, the third conveyor belt 5 also receives sand and gravel from the second conveyor belt 4, meaning it can handle sand and gravel from two sources. The discharge end of the third conveyor belt 5 is equipped with a double-pass hopper, controlled by a baffle plate. The double-pass hopper controls the material feeding into the first crusher 1 and / or the fourth conveyor belt 6. In common embodiments, the third conveyor belt 5 typically feeds only material into the first crusher 1 or only material into the fourth conveyor belt 6 at a time. The fourth conveyor belt 6 is connected to the second crusher 8 via the fifth conveyor belt 7 to feed the sand and gravel from the fourth conveyor belt 6 into the second crusher 8. The first crusher 1 is a single-cylinder cone crusher; the second crusher 8 is an impact crusher.

[0026] The first belt conveyor 2 is located below the discharge ends of the first crusher 1 and the second crusher 8 and receives the sand and gravel crushed by the first crusher 1 and the second crusher 8. A first vibrating screen 3 is installed below the end of the first belt conveyor 2. The first vibrating screen 3 is a circular vibrating screen and is equipped with three sizes of screen mesh, which are 80mm, 40mm and 3mm from top to bottom.

[0027] In one exemplary embodiment, the discharge end of the first vibrating screen 3 is equipped with a second belt conveyor 4, a sixth belt conveyor 9, and a seventh belt conveyor 10. Sand and gravel that fails to pass through the largest screen (80mm) of the first vibrating screen 3 enters the second belt conveyor 4, which then sends it to the third belt conveyor 5, and then, depending on actual needs, to the first crusher 1 or the second crusher 8 for further crushing. Sand and gravel that passes through the largest screen (80mm) of the first vibrating screen 3 but fails to pass through the second largest screen (40mm) has two paths: one path is to enter the second belt conveyor 4, and then, via the third belt conveyor 5, to be sent to the first crusher 1 or the second crusher 8 for further crushing as needed; the other path is to enter the sixth belt conveyor 9, and then, via the eighteenth belt conveyor 36 and the nineteenth belt conveyor 37, to enter the 40-80mm large stone pile 38 as the finished product.

[0028] This invention adds a second crusher 8. When producing three-grade aggregate, the semi-finished material processed by the fifth crusher 24 (jaw crusher) enters the second crusher 8 (impact crusher) for shaping and crushing. By adjusting the discharge port size of the second crusher 8, the output of large stones (40-80mm) is increased. The shaping effect of the second crusher 8 (which is an impact crusher) is used to reduce the content of needle-like and flaky large stones, while increasing the content of fine particles and improving the output of finished sand.

[0029] The third conveyor belt 5 uses a double-hopper discharge method, controlled by a baffle plate. When producing tertiary aggregate, a fourth conveyor belt 6, with the same width as the third conveyor belt 5, is added in conjunction with a fifth conveyor belt 7 to feed the semi-finished material into the second crusher 8 (impact crusher). When producing secondary aggregate, the semi-finished material directly enters the first crusher 1 (cone crusher) via the third conveyor belt 5. The discharge conveyors of the second crusher 8 and the first crusher 1 share a single first conveyor belt 2. This method achieves parallel operation of the second crusher 8 and the first crusher 1, i.e., parallel operation of the cone crusher and the impact crusher. The impact crusher (second crusher 8) is used for producing tertiary aggregate, and the cone crusher (first crusher 1) is used for producing secondary aggregate.

[0030] The seventh belt conveyor 10, located at the discharge end of the first vibrating screen 3, receives sand and gravel that passes through the second largest screen (40mm) of the first vibrating screen 3 but fails to pass through the smallest screen (3mm). The seventh belt conveyor 10, connected to the twentieth belt conveyor 39, feeds the sand and gravel into the third crusher 11, which then receives and crushes the sand and gravel. The third feeder 26 feeds the third crusher 11. In practice, the sand and gravel conveyed by the twentieth belt conveyor 39 is temporarily stored in the third feeder 26 and then fed to the third crusher 11 via the third feeder 26, which is a belt feeder. The crushed material from the third crusher 11 enters the twenty-first belt conveyor 40, and then is fed into the second vibrating screen 12, where it receives and screens the sand and gravel from the third crusher 11. The first crusher 1, the second crusher 8, and the third crusher 11 are dusted by the second bag filter 62.

[0031] The second vibrating screen 12 is equipped with three screen sizes, namely 20mm, 5mm and 3mm from top to bottom.

[0032] In one exemplary embodiment, sand and gravel that fail to pass through the largest screen size (20mm) of the second vibrating screen 12 can be conveyed to the third crusher 11 via the seventh belt conveyor 10. That is, sand and gravel that fail to pass through the largest screen size (20mm) of the second vibrating screen 12 can be conveyed to the third crusher 11 via the seventh belt conveyor 10, etc., for re-crushing. Of course, when preparing 20-40mm medium-sized stones, sand and gravel that fail to pass through the largest screen size (20mm) of the second vibrating screen 12 can also enter the 20-40mm medium-sized stone pile 43 as finished products via the twenty-second belt conveyor 41 and the twenty-third belt conveyor 42.

[0033] Sand and gravel that pass through the largest screen (20mm) of the second vibrating screen 12 but fail to pass through the second largest screen (5mm) of the same screen can enter the tenth conveyor belt 19. The tenth conveyor belt 19 is equipped with a double-pass hopper. One pass sends the sand and gravel directly to the 5-20mm small stone pile 45 as finished product via the twenty-fifth conveyor belt 47, or it is sent to the fourth crusher 13 via the twenty-fourth conveyor belt 44 (another conveying direction). The fourth crusher 13 is a vertical shaft impact crusher. The other pass connects to the fourth vibrating screen 18 to screen the sand and gravel. The fourth vibrating screen 18 is a circular vibrating screen with a 15mm screen. The tenth conveyor belt 19 is equipped with a double-pass hopper, and baffles are used to control which way the sand and gravel enter.

[0034] The eleventh belt conveyor 20 is used to receive sand and gravel that fails to pass through the smallest screen (15mm) of the fourth vibrating screen 18 and feeds it into the fourth crusher 13 for crushing. The sand and gravel screened by the fourth vibrating screen 18 enters the 5-15mm pebbles pile 46 as finished products.

[0035] The double-pass hoppers of the tenth belt conveyor 19 respectively feed the material to the twenty-fifth belt conveyor 47 and the twenty-sixth belt conveyor 48. The twenty-sixth belt conveyor 48 sends the sand and gravel to the fourth vibrating screen 18. The twenty-fifth belt conveyor 47 sends the sand and gravel to the twenty-fourth belt conveyor 44. The sand and gravel from the eleventh belt conveyor 20 can also be sent to the twenty-fourth belt conveyor 44. The sand and gravel from the twenty-fourth belt conveyor 44 can enter the 5-20mm small stone pile 45 as finished product, or be sent to the fourth crusher 13 for crushing.

[0036] Sand and gravel (3-5mm) that pass through the twelve large-size screens (5mm) of the second vibrating screen 12 but fail to pass through the smallest-size screen (3mm) of the second vibrating screen 12 can be conveyed to the third crusher 11 via the seventh belt conveyor 10 for crushing. That is, the seventh belt conveyor 10 is connected to the second vibrating screen 12 and can handle sand and gravel that fail to pass through the largest-size screen (20mm) and the smallest-size screen (3mm) of the second vibrating screen 12.

[0037] The twenty-seventh belt conveyor 49 is located below the first vibrating screen 3 and the second vibrating screen 12. It is used to receive sand and gravel of the smallest size (3mm) that passes through the first vibrating screen 3 and the second vibrating screen 12. At this time, the sand and gravel are used as manufactured sand.

[0038] This invention addresses the issue of high fineness modulus in manufactured sand by modifying the vibrating screen. The lower layer screens are all replaced with 3mm screens, and the finished product screening vibrating screen is replaced with a 3-layer screen (3YKR2475) with 20mm, 5mm, and 3mm screens. A gradation adjustment process is added, allowing 20-40mm crushed stone to be directly output as finished product. When producing smaller stones (5-20mm), the 5-20mm material enters the finished small stone silo via the tenth belt conveyor. 0-3mm material is used as manufactured sand and enters the sand silo. The 3-5mm material can then be repeatedly crushed and made into sand via the seventh belt conveyor into the sand making machine's adjustment silo. This achieves adjustable fineness modulus of the sand and increases manufactured sand production while ensuring the fineness modulus meets requirements.

[0039] In a preferred embodiment, the sand and gravel processing device includes a sand washing and recycling integrated machine 15, an eighth belt conveyor 16, and a ninth belt conveyor 17.

[0040] The 27th belt conveyor 49 is connected to the sand washing and recycling integrated machine 15 via the 28th belt conveyor 50 to feed the sand and gravel on it into the sand washing and recycling integrated machine 15. That is, the sand washing and recycling integrated machine 15 is used to receive the smallest size sand and gravel that has passed through the first vibrating screen 3 and the second vibrating screen 12 to achieve sand washing. At the same time, the 28th belt conveyor 50 is a double-pass discharge form with double hoppers. The sand and gravel that is discharged in the other passage is directly fed into the 8th belt conveyor 16 via the 29th belt conveyor 51 connected to the 28th belt conveyor 50. That is, the 8th belt conveyor 16 receives the smallest size sand and gravel (less than 3mm) that has passed through the first vibrating screen 3 and the second vibrating screen 12 and / or the sand and gravel (less than 3mm) washed by the sand washing and recycling integrated machine 15. The sand and gravel washed by the sand washing and recycling integrated machine 15 is fed into the 8th belt conveyor 16 via the 30th belt conveyor 52. The ninth conveyor belt 17 receives sand and gravel from the eighth conveyor belt 16 and / or receives the smallest size sand and gravel (less than 3mm) passing through the third vibrating screen. The ninth conveyor belt 17 operates in a bidirectional transmission mode. In this mode, the ninth conveyor belt 17 transports sand and gravel in one direction, conveying sand and gravel smaller than 3mm that has been washed by the integrated sand washing and recycling machine 15, and sends it to the wet sand pile 53. The ninth conveyor belt 17 also transports sand and gravel in the other direction, conveying sand and gravel smaller than 3mm that has not been washed by the integrated sand washing and recycling machine 15, and sends it to the dry sand pile 54. At the same time, the eighth conveyor belt 16 can also simultaneously receive the smallest size sand and gravel (less than 3mm) passing through the first vibrating screen 3 and the second vibrating screen 12, as well as the sand and gravel (less than 3mm) washed by the integrated sand washing and recycling machine 15, and then send them to the wet sand pile 53 via the ninth conveyor belt 17.

[0041] In a preferred embodiment, the third vibrating screen 14 receives and screens the sand and gravel crushed by the fourth crusher 13. The third vibrating screen 14 is equipped with two sizes of screens, 5mm and 3mm from top to bottom, respectively. The fourth crusher 13 can also receive the sand and gravel that fail to pass through the smallest size screen (3mm) of the third vibrating screen 14.

[0042] Preferably, a 24th belt conveyor 44 is installed at the rear end of the 25th belt conveyor 47 to receive sand and gravel conveyed by the 11th belt conveyor 20, the 12th belt conveyor 21, and the 24th belt conveyor 44. Specifically, it can receive sand and gravel that fails to pass through the smallest screen of the fourth vibrating screen 18, sand and gravel that fails to pass through the largest screen of the second vibrating screen 12, and sand and gravel that passes through the largest screen of the second vibrating screen 12 but fails to pass through the second largest screen of the second vibrating screen 12. This sand and gravel is then fed into the fourth crusher 13 for crushing. A fourth feeder 27 is located at the end of the 24th belt conveyor 44 to feed material into the fourth crusher 13. The sand and gravel on the 24th belt conveyor 44 first enters the fourth feeder 27, and is then fed through the fourth feeder 27, and then sequentially fed into the fourth crusher 13 via the 31st belt conveyor 55, the 32nd belt conveyor 56, and the 33rd belt conveyor 57 for crushing. The sand and gravel crushed by the fourth crusher 13 are then sequentially fed into the third vibrating screen 14 via the thirty-fourth belt conveyor 58 and the thirty-fifth belt conveyor 59 for screening. After screening by the third vibrating screen 14, sand and gravel that fail to pass through the smallest screen size (3mm) and / or sand and gravel that pass through the largest screen size (5mm) but fail to pass through the smallest screen size (3mm) can be sequentially fed into the dry sand pile 54 via the thirty-sixth belt conveyor 60 and the thirty-seventh belt conveyor 61, or sent to the ninth belt conveyor 17, where it can be fed into the dry sand pile 54 or the wet sand pile 53. It is understandable that the sand and gravel screened by the third vibrating screen 14 and fed into the ninth belt conveyor 17 can be mixed with sand and gravel entering the ninth belt conveyor 17 via other paths and fed into the dry sand pile 54 or the wet sand pile 53.

[0043] In this invention, an angle sensor 64 is installed above the second conveyor 4, the sixth conveyor 9, and the seventh conveyor 10. The angle sensor 64 is equipped with a baffle 65 facing the second conveyor 4, the sixth conveyor 9, or the seventh conveyor 10 and can detect the angle of the baffle 65. In practice, the baffle 65 is installed above the second conveyor 4, the sixth conveyor 9, or the seventh conveyor 10. When the second conveyor 4, the sixth conveyor 9, or the seventh conveyor 10 conveys sand and gravel, it will come into contact with the baffle 65 and cause the baffle 65 to flip. The more sand and gravel conveyed per unit time, the greater the flip angle of the baffle 65. By detecting the angle of the baffle 65 through the angle sensor 64, the approximate amount of sand and gravel conveyed per unit time and the sand and gravel ratio distribution of the second conveyor 4, the sixth conveyor 9, or the seventh conveyor 10 can be obtained. The approximate sand making situation can be grasped, and the front-end crushing process or feeding rate can be adjusted based on this approximate distribution. By adjusting the approximate distribution of sand and gravel on the second conveyor belt 4, the sixth conveyor belt 9, or the seventh conveyor belt 10, the crushing processes of the first crusher 1 and the third crusher can be adjusted. Alternatively, the material discharge method of the third conveyor belt can be adjusted to regulate the proportion of large, medium, small, and fine sand. Similarly, angle sensors 64 and baffles 65 can be installed on the tenth conveyor belt 19, the twenty-second conveyor belt 41, the twenty-seventh conveyor belt, the twenty-fifth conveyor belt 47, and the twenty-sixth conveyor belt 48 to detect the angle of the baffles 65 and thus obtain the approximate amount of sand and gravel conveyed per unit time and the proportion of sand and gravel distribution on the aforementioned conveyors. This allows for adjustments to the corresponding processes to achieve the sand-making process. It is understandable that angle sensors 64 and baffles 65 can be installed on all conveyors that pass through the crusher or screening machine to obtain the approximate amount of sand and gravel conveyed per unit time and the sand and gravel ratio distribution of the corresponding belt conveyor, so as to adjust the corresponding process to realize the sand making process, thereby better realizing data monitoring and process adjustment, to solve the problem of insufficient medium diameter of large stones and excessive small diameter of small stones, while increasing the fine particle content and increasing the output of finished sand.

[0044] The present invention also provides a sand and gravel processing method, which uses the above-mentioned sand and gravel processing apparatus and includes the following steps: S1. The material is conveyed to the first crusher 1 or the second crusher 8 via the third belt conveyor 5 for crushing. The crushed sand and gravel are then fed into the first vibrating screen 3 via the first belt conveyor 2 for screening. Sand and gravel that fail to pass through the largest screen of the first vibrating screen 3 are re-fed into the first crusher 1 or the second crusher 8 for further crushing. Sand and gravel that pass through the largest screen of the first vibrating screen 3 but fail to pass through the second largest screen of the first vibrating screen 3 are fed back into the first crusher 1 or the second crusher 8 for further crushing or as finished large stones; sand and gravel that pass through the smallest screen of the first vibrating screen 3 are used as dry sand or as wet sand through the integrated sand washing and recycling machine; wherein, the dry sand that passes through the smallest screen of the first vibrating screen 3 can be mixed with the wet sand that passes through the integrated sand washing and recycling machine to form wet sand. S2. Sand and gravel that pass through the second largest screen of the first vibrating screen 3 but fail to pass through the smallest screen of the first vibrating screen 3 are fed into the third crusher 11 for crushing. The crushed sand and gravel are then fed into the second vibrating screen 12 for screening. Sand and gravel that fail to pass through the largest screen of the second vibrating screen 12 are fed back into the third crusher 11 for further crushing or used as intermediates in the finished product. Sand and gravel that fail to pass through the second largest screen of the second vibrating screen 12, but fail to pass through the smallest screen of the second vibrating screen 12, are fed back into the third crusher 11 for further crushing. The crushed sand and gravel are then fed back into the second vibrating screen 12 for further screening. The sand and gravel passing through the smallest screen of the second vibrating screen 12 are either dry sand or wet sand passing through the integrated sand washing and recycling machine; wherein, the dry sand passing through the smallest screen of the second vibrating screen 12 can be mixed with the wet sand passing through the integrated sand washing and recycling machine to form wet sand. Sand and gravel that pass through the largest screen of the second vibrating screen 12 but fail to pass through the second largest screen of the second vibrating screen 12 are used as finished small stones. It also includes step S3, where sand and gravel that pass through the largest screen of the second vibrating screen 12 but fail to pass through the second largest screen of the second vibrating screen 12 can be fed into the fourth vibrating screen 18 for screening. The sand and gravel that pass through the screen of the fourth vibrating screen 18 are used as finished pebbles. The sand and gravel that do not pass through the screen of the fourth vibrating screen 18 are fed into the fourth crusher 13 for crushing and then fed into the third vibrating screen 14 for screening. The sand and gravel that do not pass through the largest screen of the third vibrating screen 14 are fed back into the fourth crusher 13 for crushing and then fed into the third vibrating screen 14 for screening. The sand and gravel that pass through the largest screen of the third vibrating screen 14 but fail to pass through the smallest screen of the third vibrating screen 14 are fed back into the fourth crusher 13 for crushing and then fed into the third vibrating screen 14 for screening. Alternatively, it can be used as dry sand or mixed with wet sand from the integrated sand washing and recycling machine to form wet sand. Sand and gravel that pass through the largest screen of the second vibrating screen 12 but fail to pass through the second largest screen of the second vibrating screen 12 are fed into the fourth crusher 13 for crushing and then sent to the third vibrating screen 14 for screening. Sand and gravel that fail to pass through the largest screen of the third vibrating screen 14 are fed back into the fourth crusher 13 for crushing and then sent to the third vibrating screen 14 for screening. Sand and gravel that pass through the largest screen of the third vibrating screen 14 but fail to pass through the smallest screen of the third vibrating screen 14 are fed back into the fourth crusher 13 for crushing and then sent to the third vibrating screen 14 for screening. Alternatively, it can be used as dry sand or mixed with wet sand from the integrated sand washing and recycling machine to form wet sand.

[0045] This invention improves sand production by setting up a fourth crusher 13 and a third vibrating screen 14, etc., and feeding the produced medium stones (20-40mm) and small stones (5-20mm) as sand-making raw materials into the fourth crusher 13 and the third vibrating screen 14 for crushing and screening.

[0046] This invention uses a belt conveyor to feed a portion of medium-sized stones (20-40mm) and a portion of small stones (5-20mm) into a buffer silo. The material is then fed to a fourth crusher (13) via a fourth feeder (27) and another belt conveyor for crushing and sand production. The crushed material is then conveyed to a third vibrating screen (14) for screening. The screen size is set at 5mm and 3mm. Material larger than 5mm enters the fourth crusher (13) for cyclic crushing and sand production. The undersized material (0-3mm) is conveyed to a finished sand silo via a belt conveyor. Material between 3-5mm can either enter the fourth crusher (13) for cyclic crushing and sand production, or, depending on the fineness modulus of the manufactured sand, a portion can be sent to the sand silo as finished sand. This configuration increases the output of manufactured sand to meet peak demand.

[0047] Meanwhile, this invention can also solve the problem that small stones (5-20mm) and pebbles (5-15mm) cannot be produced at the same time. The hopper of the tenth belt conveyor 19 is changed to a two-way type, so that some materials enter the fourth vibrating screen 18 through the belt conveyor. Equipped with a 15mm screen, the 5-15mm material under the screen enters the pebbles pile (5-20mm), and the 15-20mm material on the screen is sent to the fourth crusher 13 through the belt conveyor for crushing and sand making.

[0048] This invention can also adjust the content of sand and gravel powder. Engineering requirements stipulate that the content of sand and gravel powder in normal concrete products should be 6% to 18%. The quality inspection value of existing manufactured sand (dry sand) is 18% to 22%, which is too high. This invention addresses the problem of high stone powder content by using water-washed sand. In addition, in terms of process, half of the finished sand from the newly added sand production line is diverted (or mixed into the wet sand conveyor belt (such as the eighth conveyor belt 16 and the ninth conveyor belt 17) for uniform mixing and synchronous dispersion, thus solving the problem of low sand and gravel powder content in the finished sand after water washing.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sand and gravel processing device, characterized in that, Including: The first crusher (1) is a single-cylinder cone crusher; The first belt conveyor (2) is located below the discharge end of the first crusher (1) and the second crusher (8) and receives the sand and gravel crushed by the first crusher (1) and the second crusher (8); The first vibrating screen (3) is located below the end of the first belt conveyor (2); the first vibrating screen (3) is equipped with three sizes of screen mesh; The second belt conveyor (4) is located at the discharge end of the first vibrating screen (3) and is used to receive sand and gravel that fail to pass through the largest screen of the first vibrating screen (3) and / or to receive sand and gravel that pass through the largest screen of the first vibrating screen (3) but fail to pass through the second largest screen of the first vibrating screen (3). The third belt conveyor (5) receives the sand and gravel from the second belt conveyor (4). The material discharge end of the third belt conveyor (5) is equipped with a double-pass hopper. The double-pass hopper is controlled by a baffle plate to send the material into the first crusher (1) and / or into the fourth belt conveyor (6). The second crusher (8) is an impact crusher, which receives and crushes the sand and gravel from the fourth belt conveyor (6) via the fifth belt conveyor (7). The discharge end of the second crusher (8) is located above the first belt conveyor (2). In the production of three-grade aggregate, the semi-finished material is fed into the second crusher (8) for shaping and crushing through the fourth belt conveyor (6) in conjunction with the fifth belt conveyor (7); in the production of two-grade aggregate, the semi-finished material enters the first crusher (1) through the third belt conveyor (5); the first crusher (1) and the second crusher (8) are connected in parallel and share the first belt conveyor (2) as the discharge belt; The sixth belt conveyor (9) is located at the discharge end of the first vibrating screen (3) and is used to receive sand and gravel that pass through the largest screen of the first vibrating screen (3) but fail to pass through the second largest screen of the first vibrating screen (3). The seventh belt conveyor (10) is located at the discharge end of the first vibrating screen (3) and is used to receive sand and gravel that have passed through the second largest screen of the first vibrating screen (3) but have failed to pass through the smallest screen of the first vibrating screen (3). The third crusher (11) receives and crushes the sand and gravel from the seventh belt conveyor (10); The second vibrating screen (12) receives and screens the sand and gravel crushed by the third crusher (11). The second vibrating screen (12) is equipped with three sizes of screens. The sand and gravel that fail to pass through the largest size screen of the second vibrating screen (12) can be transported to the third crusher (11) by the seventh belt conveyor (10). The fourth crusher (13) receives and crushes the sand and gravel that pass through the largest screen of the second vibrating screen (12) but fail to pass through the second largest screen of the second vibrating screen (12); The third vibrating screen (14) receives and screens the sand and gravel crushed by the fourth crusher (13), and the third vibrating screen (14) is equipped with two specifications of screen mesh. The fourth crusher (13) can also receive the sand and gravel that fails to pass through the smallest specification screen mesh of the third vibrating screen (14). The integrated sand washing and recycling machine (15) is used to receive the smallest size of sand and gravel that passes through the first vibrating screen (3) and the second vibrating screen (12). The eighth belt conveyor (16) is used to receive sand and gravel of the smallest size that has passed through the first vibrating screen (3) and the second vibrating screen (12) and / or sand and gravel that has been washed by the integrated sand washing and recycling machine (15). The ninth belt conveyor (17) carries the sand and gravel from the eighth belt conveyor (16) and / or carries the smallest size of sand and gravel passing through the third vibrating screen (14). The ninth belt conveyor (17) is a bidirectional transmission mode. The fourth vibrating screen (18), the tenth belt conveyor (19), and the eleventh belt conveyor (20) are provided. The tenth belt conveyor (19) receives sand and gravel that passes through the largest screen of the second vibrating screen (12) but fails to pass through the second largest screen of the second vibrating screen (12). The tenth belt conveyor (19) is equipped with a double-pass hopper. One pass is sent to the fourth crusher (13) as finished product via the twenty-fifth belt conveyor (47) or via the twenty-fourth belt conveyor (44). The other pass is connected to the fourth vibrating screen (18). The eleventh belt conveyor (20) is used to receive sand and gravel that fails to pass through the smallest screen of the fourth vibrating screen (18) and send it to the fourth crusher (13).

2. The sand and gravel processing device according to claim 1, characterized in that, It also includes a twelfth belt conveyor (21), which is capable of receiving sand and gravel that fails to pass through the largest screen of the second vibrating screen (12) and conveying it to the fourth crusher (13) for crushing.

3. The sand and gravel processing device according to claim 1, characterized in that, It also includes a first feeder (22), a soil removal screen (23), a fifth crusher (24), and a second feeder (25); The fifth crusher (24) receives and crushes the raw material that has not passed through the first feeder (22); The soil removal screen (23) receives the raw material passing through the first feeder (22) and removes impurities; The second feeder (25) receives the raw materials crushed by the fifth crusher (24) and the raw materials removed by the soil removal screen (23) and conveys them to the first crusher (1) and / or the second crusher (8).

4. The sand and gravel processing device according to claim 1, characterized in that, It also includes a third feeder (26) for feeding the third crusher (11); and a fourth feeder (27) for feeding the fourth crusher (13).

5. The sand and gravel processing apparatus according to claim 1, characterized in that, An angle sensor (64) is provided above the second belt conveyor (4), the sixth belt conveyor (9) and the seventh belt conveyor (10). The angle sensor (64) is provided with a baffle (65) facing the second belt conveyor (4), the sixth belt conveyor (9) or the seventh belt conveyor (10) and can detect the angle of the baffle (65).

6. A method for processing sand and gravel, characterized in that, This method, using the sand and gravel processing apparatus according to any one of claims 1-5, includes the following steps: S1. The material is conveyed to the first crusher (1) or the second crusher (8) via the third belt conveyor (5) for crushing; wherein, when producing three-grade aggregate, the semi-finished material is fed into the second crusher (8), which is an impact crusher, via the fourth belt conveyor (6) in conjunction with the fifth belt conveyor (7) for shaping and crushing; when producing two-grade aggregate, the semi-finished material enters the first crusher (1), which is a single-cylinder cone crusher, via the third belt conveyor (5); the crushed sand and gravel are fed into the first vibrating screen (3) via the first belt conveyor (2) for screening; Sand and gravel that fail to pass through the largest screen of the first vibrating screen (3) are re-fed into the first crusher (1) or the second crusher (8) for crushing; Sand and gravel that pass through the largest screen of the first vibrating screen (3) but fail to pass through the second largest screen of the first vibrating screen (3) are fed back into the first crusher (1) or the second crusher (8) for further crushing or are used as finished large stones. Sand and gravel passing through the smallest screen of the first vibrating screen (3) are either dry sand or wet sand passing through the integrated sand washing and recycling machine (15); wherein, the dry sand passing through the smallest screen of the first vibrating screen (3) can be mixed with the wet sand passing through the integrated sand washing and recycling machine (15) to form wet sand. S2. Sand and gravel that pass through the second largest screen of the first vibrating screen (3) but fail to pass through the smallest screen of the first vibrating screen (3) are fed into the third crusher (11) for crushing. The crushed sand and gravel are fed into the second vibrating screen (12) for screening. Sand and gravel that fail to pass through the largest screen of the second vibrating screen (12) are fed back into the third crusher (11) for crushing or used as finished product medium. Sand and gravel that failed to pass through the second largest screen of the second vibrating screen (12) and then failed to pass through the smallest screen of the second vibrating screen (12) are fed back into the third crusher (11) for crushing. The crushed sand and gravel are then fed back into the second vibrating screen (12) for screening. Sand and gravel passing through the smallest screen of the second vibrating screen (12) are either dry sand or wet sand passing through the integrated sand washing and recycling machine (15); wherein, the dry sand passing through the smallest screen of the second vibrating screen (12) can be mixed with the wet sand passing through the integrated sand washing and recycling machine (15) to form wet sand. Sand and gravel that pass through the largest screen of the second vibrating screen (12) but fail to pass through the second largest screen of the second vibrating screen (12) are used as finished small stones; S3. Sand and gravel that pass through the largest screen of the second vibrating screen (12) but fail to pass through the second largest screen of the second vibrating screen (12) can be sent to the fourth vibrating screen (18) for screening. The sand and gravel that pass through the screen of the fourth vibrating screen (18) are used as finished pebbles. The sand and gravel that do not pass through the screen of the fourth vibrating screen (18) are sent to the fourth crusher (13) for crushing and then sent to the third vibrating screen (14) for screening. The sand and gravel that do not pass through the largest screen of the third vibrating screen (14) are sent back to the fourth crusher (13) for crushing and then sent to the third vibrating screen (14) for screening. The sand and gravel that pass through the largest screen of the third vibrating screen (14) but fail to pass through the smallest screen of the third vibrating screen (14) are sent back to the fourth crusher (13) for crushing and then sent to the third vibrating screen (14) for screening. They can be used as dry sand or mixed with wet sand from the integrated sand washing and recycling machine (15) to form wet sand. Sand and gravel that pass through the largest screen of the second vibrating screen (12) but fail to pass through the second largest screen of the second vibrating screen (12) are sent to the fourth crusher (13) for crushing and then sent to the third vibrating screen (14) for screening. Sand and gravel that fail to pass through the largest screen of the third vibrating screen (14) are sent back to the fourth crusher (13) for crushing and then sent to the third vibrating screen (14) for screening. Sand and gravel that pass through the largest screen of the third vibrating screen (14) but fail to pass through the smallest screen of the third vibrating screen (14) are sent back to the fourth crusher (13) for crushing and then sent to the third vibrating screen (14) for screening. Alternatively, it can be used as dry sand or mixed with wet sand from the integrated sand washing and recycling machine (15) to form wet sand.

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