Sandstone processing system and sandstone processing method

Abstract

The invention discloses a gravel processing system which comprises a first crushing workshop, a discharging port of the first crushing workshop is connected with a semi-finished product yard through a sealing-tape machine, the semi-finished product yard is connected with a second crushing workshop, a discharging port of the second crushing workshop is connected with a screening building through a sealing-tape machine, and a discharging port of the screening building is communicated with a feeding port of the second crushing workshop through shunting of the sealing-tape machine. A discharging port of the screening building is connected with a washing screening workshop, a pisolite screening workshop, a powder selecting workshop and a coarse sand shaping workshop through sealing-tape machines, a discharging port of the coarse sand shaping workshop is communicated with a feeding port of the powder selecting workshop, and discharging ports of the washing screening workshop, the pisolite screening workshop and the powder selecting workshop are all connected with the same finished product stock ground. The finished product yard and the screening building are connected with the same fine crushing workshop through sealing-tape machines, and a discharging port of the fine crushing workshop is connected with a feeding port of the screening building. According to the invention, the fine crushing workshop is communicated with the finished product stockyard, so that the processed sand can be reprocessed, and the rolling sand or normal sand can be additionally produced to meet different yield requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of sandstone aggregate processing, relates to a sandstone processing system, and also relates to a sandstone processing method using the system. Background Art

[0002] In the conventional production process of sand and gravel aggregates, the raw materials are crushed multiple times, and then the screening device screens the crushed raw materials into several types of sand and gravel according to the diameter. In this process, the output of sand and gravel of different diameters depends on the crushing capacity of the crushing device, and the output of sand and gravel of each diameter is relatively fixed. However, in the actual construction process, the consumption of sand and gravel at the construction site may not match the output of sand and gravel, and the demand for sand and gravel of a certain size may be high in different construction projects or engineering progress. For this reason, it is necessary to design a sand and gravel processing system that can adjust the output of sand and gravel of different diameters according to actual needs. Summary of the invention

[0003] The purpose of the present invention is to provide a sand and gravel processing system, which has the characteristics of being able to adjust the output of sand and gravel of different sizes according to actual needs and meet different production indicators.

[0004] The technical scheme adopted by the present invention is that it includes a crushing workshop, the discharge port of the first crushing workshop is connected to the semi-finished product yard through a belt conveyor, the semi-finished product yard is connected to the second crushing workshop, the discharge port of the second crushing workshop is connected to the screening building through a belt conveyor, and the discharge port of the screening building is connected to the feed port of the second crushing workshop through a belt conveyor diversion, the discharge port of the screening building is connected to the washing and screening workshop, the pebbles screening workshop, the powder selection workshop and the coarse sand shaping workshop respectively through belt conveyors, wherein the discharge port of the coarse sand shaping workshop is connected to the feed port of the powder selection workshop, the discharge ports of the washing and screening workshop, the pebbles screening workshop and the powder selection workshop are all connected to the same finished product yard, the finished product yard and the screening building are all connected to the same fine crushing workshop through belt conveyors, and the discharge port of the fine crushing workshop is connected to the feed port of the screening building.

[0005] The present invention is also characterized in that: A crushing workshop includes a grizzly vibrating feeder and a first crusher which are arranged in sequence from the feed port to the discharge port. The grizzly vibrating feeder is connected to the pre-screening workshop through a belt conveyor. The material-facing surface of the grizzly vibrating feeder is connected to the first crusher, and the discharge surface is connected to the pre-screening workshop. The discharge end of the first crusher is connected to the semi-finished product yard.

[0006] The pre-screening workshop comprises a first circular vibrating screen connected to a bar-type vibrating feeder, and a material-facing surface of the first circular vibrating screen is connected to a semi-finished product material yard through a belt conveyor.

[0007] The second crushing workshop includes a buffer bin connected to the semi-finished product yard. The buffer bin is connected to the second crusher through a belt conveyor, and the discharge end of the second crusher is connected to the screening building through a belt conveyor.

[0008] The screening building includes a second circular vibrating screen connected to the second crusher. The second circular vibrating screen is composed of three layers of screens, and the screen holes gradually decrease from top to bottom. The material-facing surface of the upper screen of the second circular vibrating screen is connected to the feed port of the second crushing workshop through a belt conveyor. The material-facing surface of the middle screen of the second circular vibrating screen is connected to the first distributor through a belt conveyor, and the first distributor is respectively connected to the second crushing workshop and the washing and screening workshop. The material-facing surface of the lower screen of the second circular vibrating screen is connected to the washing and screening workshop through a belt conveyor, and the discharge port of the second circular vibrating screen is connected to the third circular vibrating screen. The third circular vibrating screen consists of two layers of screens, the upper layer of which has a larger aperture than the lower layer. The material-facing surface of the upper layer is connected to the pebbles screening workshop through a belt conveyor, the material-facing surface of the lower layer of the third circular vibrating screen is connected to the coarse sand shaping workshop through a belt conveyor, and the discharge port of the third circular vibrating screen is connected to the powder selection workshop through a belt conveyor. The screening building also includes the fourth circular vibrating screen connected to the discharge port of the fine crushing workshop. The fourth circular vibrating screen is composed of three layers of screens, and the screen holes gradually decrease from top to bottom. The material-facing surface of the upper screen of the fourth circular vibrating screen is connected to the feed port of the fine crushing workshop through a belt conveyor, the material-facing surface of the middle screen of the fourth circular vibrating screen is connected to the pebble screening workshop through a belt conveyor, the material-facing surface of the lower screen of the fourth circular vibrating screen is connected to the coarse sand shaping workshop through a belt conveyor, and the discharge port of the fourth circular vibrating screen is connected to the powder selection workshop through a belt conveyor.

[0009] The washing and screening workshop includes two first linear vibrating screens connected to the screening building, the first distributor and the material-facing surface of the lower screen of the second circular vibrating screen are respectively connected to a first linear vibrating screen, and the output ends of the two first linear vibrating screens are respectively connected to the finished product material yard; The pebble screening workshop includes a second linear vibrating screen connected to the upper material-facing surface of the third circular vibrating screen and the material-facing surface of the middle screen of the fourth circular vibrating screen. The material-facing surface of the second linear vibrating screen is connected to the finished product material yard through a belt conveyor. The powder selection workshop includes a second distributor connected to the screening building, the second distributor is respectively connected to the finished material yard and the powder selector, and the output end of the powder selector is connected to the finished material yard through a belt conveyor; The coarse sand shaping workshop comprises a first vertical shaft crusher connected to the screening building, and the discharge port of the first vertical shaft crusher is connected to the second distributor through a belt conveyor.

[0010] The finished material yard is divided into a material storage area and a sand storage area. The material storage area is divided into several zones according to the diameter of sand and gravel. The sand storage area consists of two zones, corresponding to the two processing methods in the powder selection workshop, which are the powder selection method and the one that is not. The material storage area is connected to the fine crushing workshop through a belt conveyor.

[0011] The fine crushing workshop includes a second vertical shaft crusher connected to the finished material yard through a belt conveyor, and the output end of the second vertical shaft crusher is connected to the screening building through a belt conveyor.

[0012] The secondary crushing workshop, fine crushing workshop, screening building and powder selection workshop are all permanently connected with bag dust collectors; Both the flushing and screening workshop and the pebbles screening workshop are connected to a wastewater treatment system, which includes a collecting pool connected to the flushing and screening workshop and the pebbles screening workshop through a pipeline, the collecting pool is connected to a fine sand recovery device through a pipeline, the sand discharge port of the fine sand recovery device is connected to the finished material yard, and its sewage outlet is connected to a sedimentation tank through a pipeline, a dosing device is fixedly connected to the sedimentation tank, and a return water pool and a thick slurry pool are respectively connected to the surface of the sedimentation tank through pipelines, wherein the thick slurry pool is connected to a plate and frame filter press through a pipeline, and the plate and frame filter press is connected to the return water pool through a pipeline.

[0013] Another technical solution adopted by the present invention is a sandstone processing method, which is specifically implemented according to the following steps: Step 1: Unload the sand making raw materials into the first crushing workshop, and send the initially crushed materials into the semi-finished product yard; Step 2: The materials in the semi-finished material yard are sent to the secondary crushing workshop via a belt conveyor for secondary crushing, and finally sent to the screening building for screening; Step 3: The screening building screens the materials according to their diameter after secondary crushing and transports them to the washing and screening workshop, the pebbles screening workshop, the powder selection workshop and the coarse sand shaping workshop for further processing. The products are then sent to the finished product yard by a belt conveyor. At this time, the materials screened by the screening building can be sent to the secondary crushing workshop or the fine crushing workshop according to production needs; Step 4: According to production needs, the sand and gravel in the finished material yard can be transported to the fine crushing workshop for further processing, and then sent to the screening building from the fine crushing workshop, and then sent to the finished material yard for storage after screening.

[0014] The beneficial effects of the present invention are: 1. In the present invention, the finished material yard is connected with the fine crushing workshop, the processed sand and gravel can be reprocessed, and the finished raw materials can be used to produce sand and gravel when the previous production process is shut down or the raw materials are insufficient. The production process can be adjusted according to actual needs to meet different production indicators.

[0015] 2. In the present invention, the discharge end of the screening building is connected with the feed inlet of the secondary crushing workshop and the fine crushing workshop, so that the sand and gravel with large diameter and not meeting the production requirements can be directly sent to the secondary crushing workshop or the fine crushing workshop for re-crushing, thereby improving the production of sand and gravel and the utilization rate of raw materials.

[0016] 3. In the present invention, the pre-screening workshop can be used to pre-screen raw materials with low saturated compressive strength, fragile and high soil content, thereby improving the quality of semi-finished raw materials, reducing the burden of subsequent screening, and improving the quality of finished sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a process flow chart of the sand and stone processing system of the present invention; Figure 2 It is a structural schematic diagram of the sand and stone processing system of the present invention; Figure 3 It is a process flow chart of the wastewater treatment system in the present invention.

[0018] In the figure: 1. First crushing workshop; 2. Semi-finished product yard; 3. Second crushing workshop; 4. Screening building; 5. Flushing and screening workshop; 6. Pebble screening workshop; 7. Powder selection workshop; 8. Coarse sand shaping workshop; 9. Finished product yard; 10. Fine crushing workshop; 11. Grit vibrating feeder; 12. First crusher; 13. Pre-screening workshop; 14. First circular vibrating screen; 15. Buffer bin; 16. Second crusher; 17. Second circular vibrating screen; 18. First distributor; 19. Third circular vibrating screen Moving screen; 20. Fourth circular vibrating screen; 21. First linear vibrating screen; 22. Second linear vibrating screen; 23. Second distributor; 24. Powder selector; 25. First vertical shaft crusher; 26. Material storage area; 27. Sand storage area; 28. Second vertical shaft crusher; 29. ​​Bag filter; 30. Wastewater treatment system; 31. Collection tank; 32. Fine sand recovery device; 33. Sedimentation tank; 34. Dosing device; 35. Return water tank; 36. Thick slurry tank; 37. Plate and frame filter press. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Embodiment 1: like Figure 1 As shown, it includes a crushing workshop 1, the discharge port of the crushing workshop 1 is connected to the semi-finished product yard 2 through a belt conveyor, the semi-finished product yard 2 is connected to the second crushing workshop 3, the discharge port of the second crushing workshop 3 is connected to the screening building 4 through a belt conveyor, and the discharge port of the screening building 4 is connected to the feed port of the second crushing workshop 3 through a belt conveyor diversion, the discharge port of the screening building 4 is respectively connected to the washing and screening workshop 5, the pebbles screening workshop 6, the powder selection workshop 7 and the coarse sand shaping workshop 8 through the belt conveyor, wherein the discharge port of the coarse sand shaping workshop 8 is connected to the feed port of the powder selection workshop 7, the discharge ports of the washing and screening workshop 5, the pebbles screening workshop 6 and the powder selection workshop 7 are all connected to the same finished product yard 9, the finished product yard 9 and the screening building 4 are all connected to the same fine crushing workshop 10 through a belt conveyor, and the discharge port of the fine crushing workshop 10 is connected to the feed port of the screening building 4.

[0021] In the production process, the raw materials are first sent to the first crushing workshop 1 for crushing, and then sent to the semi-finished product yard 2 for storage. When large-scale production of sand and gravel is required, the raw materials in the semi-finished product yard 2 are sent to the second crushing workshop 3 for crushing through a belt conveyor, and then sent to the screening building 4. The sand and gravel with too large diameter and excess are sent back to the second crushing workshop 3 for crushing, and the remaining sand and gravel are sent to the washing and screening workshop 5, the pebbles screening workshop 6, the coarse sand shaping workshop 8 and the powder selection workshop 7 in order of diameter from large to small for processing, and stored in the finished product yard 9.

[0022] When the demand for a certain type of sand increases, part of the sand and gravel in the finished material yard 9 can be sent to the fine crushing workshop 10 by a belt conveyor for crushing, and then sent to the screening building 4 for screening, so as to obtain the required sand and gravel to meet different production needs.

[0023] Embodiment 2: Based on Example 1: like Figure 2 As shown, a crushing workshop 1 includes a rod-type vibrating feeder 11 and a first crusher 12 which are arranged in sequence from the feed port to the discharge port. The rod-type vibrating feeder 11 is connected to the pre-screening workshop 13 through a belt conveyor. The material-facing surface of the rod-type vibrating feeder 11 is connected to the first crusher 12, and the material-discharging surface is connected to the pre-screening workshop 13. The discharge end of the first crusher 12 is connected to the semi-finished product yard 2.

[0024] The pre-screening workshop 13 comprises a first circular vibrating screen 14 connected to the grizzly vibrating feeder 11 , and a material-facing surface of the first circular vibrating screen 14 is connected to the semi-finished product yard 2 via a belt conveyor.

[0025] The second crushing workshop 3 includes a buffer bin 15 connected to the semi-finished product yard 2, the buffer bin 15 is connected to the second crusher 16 through a belt conveyor, and the discharge end of the second crusher 16 is connected to the screening building 4 through a belt conveyor.

[0026] The grizzly vibrating feeder 11 can screen the raw materials while feeding, sending the raw materials with larger diameters to the first crusher 12 for crushing, and the raw materials with smaller diameters are directly sent to the semi-finished material yard 2 for storage by the belt conveyor, reducing the raw materials that need to be crushed by the first crusher 12 and improving the raw material processing efficiency.

[0027] In the present invention, it is easier to obtain products with uniform particle size and good particle shape through two-stage crushing in the first crushing workshop 1 and the second crushing workshop 3. At the same time, different crusher combinations can be selected according to production requirements to meet different product requirements.

[0028] In the actual sand and gravel production process, due to reasons such as mining batches, the raw materials may have low compressive strength, be easily broken into small particles, and have high soil content. In the production process, some inferior raw materials need to be screened to improve the quality of the finished sand and gravel. For this purpose, a pre-screening workshop 13 is set up to screen out unqualified raw materials to improve the quality of the finished sand and gravel.

[0029] Embodiment three: Based on Example 1: like Figure 2 As shown, the screening building 4 includes a second circular vibrating screen 17 connected to the second crusher 16, the second circular vibrating screen 17 is composed of three layers of screens, and the screen holes gradually decrease from top to bottom, the material-facing surface of the upper screen of the second circular vibrating screen 17 is connected to the feed port of the second crushing workshop 3 through a belt conveyor, the material-facing surface of the middle screen of the second circular vibrating screen 17 is connected to the first distributor 18 through a belt conveyor, and the first distributor 18 is respectively connected to the second crushing workshop 3 and the washing and screening workshop 5, the material-facing surface of the lower screen of the second circular vibrating screen 17 is connected to the washing and screening workshop 5 through a belt conveyor, and the discharge port of the second circular vibrating screen 17 is connected to the third circular vibrating screen 19; The third circular vibrating screen 19 is composed of an upper and lower screen mesh, and the aperture of the upper screen mesh is larger than that of the lower screen mesh. The material-facing surface of the upper screen mesh is connected to the pebbles screening workshop 6 through a belt conveyor, and the material-facing surface of the lower screen mesh of the third circular vibrating screen 19 is connected to the coarse sand shaping workshop 8 through a belt conveyor. The discharge port of the third circular vibrating screen 19 is connected to the powder selection workshop 7 through a belt conveyor. The screening building 4 also includes a fourth circular vibrating screen 20 connected to the discharge port of the fine crushing workshop 10. The fourth circular vibrating screen 20 is composed of three layers of screens, and the screen holes gradually decrease from top to bottom. The material-facing surface of the upper screen of the fourth circular vibrating screen 20 is connected to the feed port of the fine crushing workshop 10 through a belt conveyor, the material-facing surface of the middle screen of the fourth circular vibrating screen 20 is connected to the pebble screening workshop 6 through a belt conveyor, the material-facing surface of the lower screen of the fourth circular vibrating screen 20 is connected to the coarse sand shaping workshop 8 through a belt conveyor, and the discharge port of the fourth circular vibrating screen 20 is connected to the powder selection workshop 7 through a belt conveyor.

[0030] The screening building 4 is mainly used to screen the crushed raw materials and send them to different processing workshops for processing according to the diameter of the crushed raw materials. The second circular vibrating screen 17 and the third circular vibrating screen 19 are used to process the crushed raw materials in the second crushing workshop 3, and the second circular vibrating screen 17 can cooperate with the belt conveyor to send the raw materials that do not meet the diameter requirements back to the second crushing workshop 3 for crushing, thereby improving the utilization rate of the raw materials. The diameters of the three-layer screen holes of the second circular vibrating screen 17 are 80mm, 40mm and 20mm from top to bottom, respectively, and the diameters of the two-layer screen holes of the third circular vibrating screen 19 are 5mm and 3mm from top to bottom, respectively.

[0031] The fourth circular vibrating screen 20 is used to screen the finished raw materials after crushing in the fine crushing workshop 10, and can cooperate with the belt conveyor to send sand and gravel with too large diameter to the fine crushing workshop 10 for processing to meet production needs. The diameters of the three-layer screen holes of the fourth circular vibrating screen 20 are 20mm, 5mm and 3mm from top to bottom.

[0032] At the same time, the fourth circular vibrating screen 20 operates independently from the second circular vibrating screen 17 and the third circular vibrating screen 19 without interfering with each other. The fourth circular vibrating screen 20 and the fine crushing workshop 10 can cooperate to produce sand and gravel of other diameters with finished sand and gravel as raw materials outside the main production line to meet the sudden large demand for a certain kind of sand and gravel.

[0033] Embodiment 4: Based on Example 3: like Figure 2 As shown, the washing and screening workshop 5 includes two first linear vibrating screens 21 connected to the screening building 4, the first distributor 18 and the material-facing surface of the lower screen of the second circular vibrating screen 17 are respectively connected to a first linear vibrating screen 21, and the output ends of the two first linear vibrating screens 21 are respectively connected to the finished product material field 9; The pebble screening workshop 6 includes a second linear vibrating screen 22 connected to the upper material-facing surface of the third circular vibrating screen 19 and the material-facing surface of the middle screen of the fourth circular vibrating screen 20. The material-facing surface of the second linear vibrating screen 22 is connected to the finished product material yard 9 through a belt conveyor; The powder selection workshop 7 includes a second distributor 23 connected to the screening building 4, the second distributor 23 is respectively connected to the finished material field 9 and the powder selector 24, and the output end of the powder selector 24 is connected to the finished material field 9 through a belt conveyor; The coarse sand shaping workshop 8 includes a first vertical shaft crusher 25 connected to the screening building 4, and the discharge port of the first vertical shaft crusher 25 is connected to the second distributor 23 through a belt conveyor.

[0034] The first linear vibrating screen 21 in the flushing and screening workshop 5 is of model ZKR1445, which can flush the sand and gravel while screening to remove the soil, impurities and sludge therein, thereby improving the cleanliness and quality of the finished sand and gravel.

[0035] The second linear vibrating screen 22 in the pea stone screening workshop 6 is of model 2ZKR1445 and is designed with two layers of screens. While removing the soil, a small amount of pea stones with a diameter of 5 to 10 mm can be screened out and stored in the pea stone stockpile.

[0036] The second distributor 23 in the powder selection workshop 7 can control whether the screened sand and gravel enter the powder selection device 24. When it is necessary to produce normal sand, the second distributor 23 is controlled to send the screened sand and gravel into the powder selection device 24 to remove dust; when it is necessary to produce rolled sand, the second distributor 23 is controlled to directly send the screened sand and gravel to the finished material yard 9 for storage through the belt conveyor to retain dust.

[0037] The coarse sand shaping workshop 8 crushes the sand and gravel with a diameter of 3 to 5 mm through the first vertical shaft crusher 25, reduces the content of needle-like particles, improves the particle shape quality of the coarse sand, and makes it more in line with the standards and requirements of construction sand.

[0038] Embodiment five: Based on the fourth embodiment: like Figure 2 As shown, the finished material yard 9 is divided into a material storage area 26 and a sand storage area 27. The material storage area 26 is divided into several partitions according to the diameter of the sand and gravel. The sand storage area 27 consists of two partitions, which respectively correspond to the two processing methods in the powder selection workshop 7, i.e., whether the powder is passed through the powder selector 24 or not. The material storage area 26 is connected to the fine crushing workshop 10 through a belt conveyor.

[0039] The fine crushing workshop 10 includes a second vertical shaft crusher 28 connected to the finished material yard 9 through a belt conveyor, and the output end of the second vertical shaft crusher 28 is connected to the screening building 4 through a belt conveyor.

[0040] In this embodiment, the material storage area 26 is divided into three partitions, which are used for storage according to the diameters of sand and gravel of 40mm-80mm, 20mm-40mm and 5mm-20mm. The partitions corresponding to the sand and gravel of 20mm-40mm and 5mm-20mm are connected to the fine crushing workshop 10, and the production of rolled sand or normal sand can be carried out through the reprocessing of the fine crushing workshop 10.

[0041] Embodiment six: Based on Example 1: like Figure 2 and Figure 3 As shown, the secondary crushing workshop 3, the fine crushing workshop 10, the screening building 4 and the powder selection workshop 7 are all fixedly connected with bag dust collectors 29; The flushing and screening workshop 5 and the pebble screening workshop 6 are both connected to a wastewater treatment system 30, which includes a collecting tank 31 connected to the flushing and screening workshop 5 and the pebble screening workshop 6 through a pipeline, the collecting tank 31 is connected to a fine sand recovery device 32 through a pipeline, the sand discharge port of the fine sand recovery device 32 is connected to the finished material yard 9, and its sewage outlet is connected to a sedimentation tank 33 through a pipeline, a dosing device 34 is fixedly connected to the sedimentation tank 33, and a return water tank 35 and a thick slurry tank 36 are respectively connected to the surface of the sedimentation tank 33 through pipelines, wherein the thick slurry tank 36 is connected to a plate and frame filter press 37 through a pipeline, and the plate and frame filter press 37 is connected to the return water tank 35 through a pipeline.

[0042] The bag dust collector 29 is used to remove dust during the crushing and screening process, reduce the dust content in the sand and gravel, protect the crushing and screening device from running without being affected by dust, extend the service life of the device, and improve the quality of the finished sand and gravel.

[0043] The wastewater treatment system 30 is used to treat the wastewater generated when washing sand and gravel in the washing and screening workshop 5 and the gravel screening workshop 6. The fine sand in the wastewater is removed by the fine sand recovery device 32, and then the wastewater after sand removal is pumped into the sedimentation tank 33, and the wastewater is further separated into sludge and clean water in the sedimentation tank 33. The sludge is further dehydrated by the plate and frame filter press 37 to facilitate the reuse of the washing water.

[0044] The present invention connects the finished material yard with the fine crushing workshop, so that the processed sand and gravel can be reprocessed, and the finished raw materials can be used to produce sand and gravel when the previous production process is shut down or the raw materials are insufficient. In this production process, the crushing device and the screening device are independent of the main production line and will not affect the production process of the main production line. The production process can be adjusted according to the actual production situation to meet different production indicators.

[0045] Working principle: First, the raw materials to be processed are sent to a crushing workshop 1. After screening by a bar vibrating feeder 11, the raw materials with larger diameters are sent to the first crusher 12 for crushing. After crushing, the raw materials are sent to the semi-finished product yard 2 for storage by a belt conveyor, and the raw materials with smaller diameters are sent to the pre-screening workshop 13 by a belt conveyor. When the saturated compressive strength of the raw materials is low, it is easy to break into smaller particles and has a high soil content, the first circular vibrating screen 14 is started for screening to remove the soil in the raw materials, and then they are sent to the semi-finished product yard 2 for storage. Otherwise, they are directly sent to the semi-finished product yard 2 for storage.

[0046] The crushed raw materials in the semi-finished material yard 2 are sent to the secondary crushing workshop 3 by a belt conveyor for further crushing, and then sent to the screening building 4 for screening.

[0047] In the screening building, the second circular vibrating screen 17 divides the sand and gravel into no less than 80mm, 40mm-80mm, 20mm-40mm and no more than 20mm according to the diameter, and the sand and gravel no less than 80mm is sent to the second crushing workshop 3 for re-crushing. The sand and gravel of 20mm-40mm is sent to a first linear vibrating screen 21 in the washing and screening workshop 5, and is sent to the finished material yard 9 for storage after washing. The sand and gravel no more than 20mm is sent to the third circular vibrating screen 19 for further screening. The sand and gravel of 40mm-80mm is sent to the washing and screening workshop 5 or the second crushing workshop 3 according to production needs. When it is necessary to produce sand and gravel of 40mm-80mm, more sand and gravel are sent to the washing and screening workshop 5 for washing and then sent to the finished material yard 9 for storage by adjusting the first distributor 18; when it is necessary to produce sand and gravel with a smaller diameter, the first distributor 18 is adjusted to allow more sand and gravel to enter the second crushing workshop 3 for crushing.

[0048] The third circular vibrating screen 19 further screens the gravel not larger than 20mm into 5mm~20mm, 5mm~3mm and not larger than 3mm. Among them, the gravel of 5mm~20mm is transported to the pea stone screening workshop 6 via a belt conveyor. When the pea stone needs to be produced, the second linear vibrating screen 22 is started to screen the pea stone, otherwise it is sent to the finished material field 9 for storage. The gravel not larger than 3mm is transported to the powder selection workshop 7, and the second distributor 23 is adjusted according to the production demand. When the demand for rolled sand is large, the second distributor 23 is adjusted to directly send the gravel not larger than 3mm to the partition corresponding to the finished material field 9; when the demand for normal sand is large, the second distributor 23 is adjusted to send the gravel not larger than 3mm to the powder selector 24 to remove dust, and then send it to the partition corresponding to the finished material field 9. The gravel of 5mm~3mm is sent to the coarse sand shaping workshop 8 for further crushing, and then sent to the powder selection workshop 7 for processing.

[0049] When a large amount of rolled sand or normal sand is needed in the actual production process, the 20mm-40mm and 5mm-20mm sand and gravel in the finished material field 9 are sent to the fine crushing workshop 10 for crushing through a belt conveyor, and then sent to the fourth circular vibrating screen 20 of the screening building 4 for screening. The fourth circular vibrating screen 20 divides the sand and gravel into not less than 20mm, 5mm-20mm, 3mm-5mm and not more than 3mm according to the diameter. Among them, the sand and gravel not less than 20mm are sent back to the fine crushing workshop 10 for crushing. The sand and gravel of 5mm-20mm are sent to the pea stone screening workshop 6 by the belt conveyor for processing and then sent to the finished material field 9 for storage. The sand and gravel of 3mm-5mm are sent to the coarse sand shaping workshop 8 by the belt conveyor for crushing and then sent to the powder selection workshop 7 together with the sand and gravel not more than 3mm, and then the rolled sand or normal sand is produced according to the production demand.

Claims

1. Sand and gravel processing system, characterized in that: The invention comprises a crushing workshop (1), wherein the discharge port of the crushing workshop (1) is connected to a semi-finished product yard (2) via a belt conveyor, the semi-finished product yard (2) is connected to a second crushing workshop (3), the discharge port of the second crushing workshop (3) is connected to a screening building (4) via a belt conveyor, and the discharge port of the screening building (4) is connected to the feed port of the second crushing workshop (3) via a belt conveyor, and the discharge port of the screening building (4) is connected to a washing and screening workshop (5), a pebbles screening vehicle, and a washing and screening vehicle via a belt conveyor. The invention relates to a washing and screening workshop (5), a powder selection workshop (6), a powder selection workshop (7) and a coarse sand shaping workshop (8), wherein the discharge port of the coarse sand shaping workshop (8) is connected to the feed port of the powder selection workshop (7), the discharge ports of the washing and screening workshop (5), the pebbles screening workshop (6) and the powder selection workshop (7) are all connected to the same finished product yard (9), the finished product yard (9) and the screening building (4) are all connected to the same fine crushing workshop (10) through a belt conveyor, and the discharge port of the fine crushing workshop (10) is connected to the feed port of the screening building (4).

2. The sand and stone processing system according to claim 1, characterized in that: The first crushing workshop (1) comprises a grizzly vibrating feeder (11) and a first crusher (12) which are arranged in sequence from a material inlet to a material outlet, the grizzly vibrating feeder (11) is connected to a pre-screening workshop (13) via a belt conveyor, a material-facing surface of the grizzly vibrating feeder (11) is connected to the first crusher (12), a material-discharging surface is connected to the pre-screening workshop (13), and a material-discharging end of the first crusher (12) is connected to a semi-finished product yard (2).

3. The sand and stone processing system according to claim 2, characterized in that: The pre-screening workshop (13) comprises a first circular vibrating screen (14) connected to the bar-type vibrating feeder (11), and a material-facing surface of the first circular vibrating screen (14) is connected to the semi-finished product yard (2) via a belt conveyor.

4. The sand and stone processing system according to claim 1, characterized in that: The secondary crushing workshop (3) comprises a buffer bin (15) connected to the semi-finished product yard (2); the buffer bin (15) is connected to the second crusher (16) via a belt conveyor; and the discharge end of the second crusher (16) is connected to the screening building (4) via a belt conveyor.

5. The sand and stone processing system according to claim 1, characterized in that: The screening building (4) comprises a second circular vibrating screen (17) connected to the second crusher (16), the second circular vibrating screen (17) comprising three layers of screen mesh, and the screen mesh apertures gradually decrease from top to bottom, the material-facing surface of the upper screen mesh of the second circular vibrating screen (17) is connected to the feed inlet of the second crushing workshop (3) via a belt conveyor, the material-facing surface of the middle screen mesh of the second circular vibrating screen (17) is connected to a first distributor (18) via a belt conveyor, and the first distributor (18) is connected to the second crushing workshop (3) and the washing and screening workshop (5) respectively, the material-facing surface of the lower screen mesh of the second circular vibrating screen (17) is connected to the washing and screening workshop (5) via a belt conveyor, and the discharge port of the second circular vibrating screen (17) is connected to a third circular vibrating screen (19); The third circular vibrating screen (19) is composed of an upper and lower screen mesh, and the aperture of the upper screen mesh is larger than that of the lower screen mesh. The material-facing surface of the upper screen mesh is connected to the pebbles screening workshop (6) through a belt conveyor, the material-facing surface of the lower screen mesh of the third circular vibrating screen (19) is connected to the coarse sand shaping workshop (8) through a belt conveyor, and the discharge port of the third circular vibrating screen (19) is connected to the powder selection workshop (7) through a belt conveyor; The screening building (4) further comprises a fourth circular vibrating screen (20) connected to the discharge port of the fine crushing workshop (10), the fourth circular vibrating screen (20) comprising three layers of screen mesh, and the screen mesh apertures gradually decrease from top to bottom, the material-facing surface of the upper screen mesh of the fourth circular vibrating screen (20) is connected to the material inlet of the fine crushing workshop (10) via a belt conveyor, the material-facing surface of the middle screen mesh of the fourth circular vibrating screen (20) is connected to the pebbles screening workshop (6) via a belt conveyor, the material-facing surface of the lower screen mesh of the fourth circular vibrating screen (20) is connected to the coarse sand shaping workshop (8) via a belt conveyor, and the discharge port of the fourth circular vibrating screen (20) is connected to the powder selection workshop (7) via a belt conveyor.

6. The sand and stone processing system according to claim 5, characterized in that: The washing and screening workshop (5) comprises two first linear vibrating screens (21) connected to the screening building (4); the material-facing surfaces of the first distributor (18) and the lower screen of the second circular vibrating screen (17) are respectively connected to a first linear vibrating screen (21); and the output ends of the two first linear vibrating screens (21) are respectively connected to the finished product yard (9); The pebble screening workshop (6) comprises a second linear vibrating screen (22) connected to the upper material-facing surface of the third circular vibrating screen (19) and the material-facing surface of the middle screen of the fourth circular vibrating screen (20), and the material-facing surface of the second linear vibrating screen (22) is connected to the finished product yard (9) via a belt conveyor; The powder selection workshop (7) comprises a second distributor (23) connected to the screening building (4), the second distributor (23) being connected to the finished product yard (9) and the powder selector (24), respectively, and the output end of the powder selector (24) being connected to the finished product yard (9) via a belt conveyor; The coarse sand shaping workshop (8) comprises a first vertical shaft crusher (25) connected to the screening building (4), and the discharge port of the first vertical shaft crusher (25) is connected to the second distributor (23) via a belt conveyor.

7. The sand and stone processing system according to claim 6, characterized in that: The finished product material yard (9) is divided into a material storage area (26) and a sand storage area (27). The material storage area (26) is divided into a plurality of subareas according to the diameter of the sand and gravel. The sand storage area (27) consists of two subareas, which respectively correspond to the two processing modes in the powder selection workshop (7) and whether or not the powder is processed through the powder selector (24). The material storage area (26) is connected to the fine crushing workshop (10) via a belt conveyor.

8. The sand and stone processing system according to claim 1, characterized in that: The fine crushing workshop (10) comprises a second vertical shaft crusher (28) connected to the finished product yard (9) via a belt conveyor, and the output end of the second vertical shaft crusher (28) is connected to the screening building (4) via a belt conveyor.

9. The sand and stone processing system according to claim 1, characterized in that: The secondary crushing workshop (3), fine crushing workshop (10), screening building (4) and powder selection workshop (7) are all fixedly connected with bag dust collectors (29); The washing and screening workshop (5) and the pebbles screening workshop (6) are both connected to a wastewater treatment system (30). The wastewater treatment system (30) comprises a collection tank (31) connected to the washing and screening workshop (5) and the pebbles screening workshop (6) via a pipeline. The collection tank (31) is connected to a fine sand recovery device (32) via a pipeline. The sand discharge port of the fine sand recovery device (32) is connected to a finished product yard (9), and the sewage discharge port thereof is connected to a sedimentation tank (33) via a pipeline. A dosing device (34) is fixedly connected to the sedimentation tank (33). The surface of the sedimentation tank (33) is respectively connected to a return water tank (35) and a concentrated slurry tank (36) via pipelines. The concentrated slurry tank (36) is connected to a plate-frame filter press (37) via a pipeline, and the plate-frame filter press (37) is connected to the return water tank (35) via a pipeline.

10. A sand and stone processing method, characterized in that: The sand and stone processing system according to any one of claims 1 to 9 is implemented in accordance with the following steps: Step 1: unload the sand making raw materials into a crushing workshop (1), and send the materials after preliminary crushing into a semi-finished product yard (2); Step 2: The materials in the semi-finished product yard (2) are sent to the secondary crushing workshop (3) via a belt conveyor for secondary crushing, and finally sent to the screening building (4) for screening; Step 3: The screening building (4) screens the material according to its diameter after secondary crushing and transports it to the washing and screening workshop (5), the pebbles screening workshop (6), the powder selection workshop (7) and the coarse sand shaping workshop (8) for further processing. The product is then sent to the finished product yard (9) via a belt conveyor. At this time, the material screened by the screening building (4) can be sent to the secondary crushing workshop (3) or the fine crushing workshop (10) according to production needs. Step 4: According to production requirements, the sand and gravel in the finished material yard (9) can be transported to the fine crushing workshop (10) for further processing, and then sent from the fine crushing workshop (10) to the screening building (4), and after screening, sent to the finished material yard (9) for storage.

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