A one-shot production of a mixed gradation aggregate system

Abstract

The utility model discloses a one -off production mixed gradation aggregate system belongs to sandstone aggregate production technical field, including frame body, the inside of frame body is equipped with screen assembly, and the lower elastic base and vibration subassembly of frame body, screen assembly includes one layer screen and two layer screen, and the upper surface of one layer screen is equipped with deceleration blocking strip, and the upper surface of two layer screen is symmetrical and is isolated and is blocked strip, and the lower surface of two layer screen is equipped with steel sheet, and the both sides of steel sheet coincide with two isolated and blocked strips without gap, the utility model discloses through two -layer screen cooperation design and the closed area structure of two layer screen, make this production system can directly produce 0.075 37.5mm qualified mixed gradation aggregate, save the manual stirring link in traditional craft, and the production efficiency of mixed material is greatly promoted, satisfies production use demand. And one production line can export four kinds of specifications aggregate simultaneously, satisfy the different needs of road base, middle layer and surface layer, and the equipment utilization rate is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of sand and gravel aggregate production technology, and in particular to a one-time production system for mixed graded aggregates. Background Technology

[0002] Existing aggregate production systems do not directly produce mixed aggregates. Instead, they primarily use jaw crushers, cone crushers, primary screens, vertical shaft crushers, secondary screens, and belt conveyor systems to produce aggregates of different particle sizes for each grade. Additionally, there is a vehicle-mounted aggregate production system that also cannot directly produce a mixed aggregate meeting all particle size requirements in a single batch. It can produce 4-5 different gradations, operating on the same principle as the stationary systems described above.

[0003] Currently, the crushing systems used in national highway projects are conventional concrete aggregate production equipment. This type of system cannot directly produce mixed gradations; it requires the production of four individual aggregates first, followed by manual mixing using loaders before being transported to the construction site. This process system has a daily output of less than 300 cubic meters, which is far from meeting the basic production needs of the project. Furthermore, the gradation deviation caused by manual mixing is as high as ±10%, posing significant efficiency bottlenecks and potential quality risks. Utility Model Content

[0004] The purpose of this invention is to solve the problems of low efficiency, uncontrollable quality, and difficulty in meeting production needs in the traditional concrete aggregate production system in the prior art, and to propose a one-time production system for mixed graded aggregates.

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

[0006] A one-time production system for mixed graded aggregates includes a frame, a screen assembly on the inner side of the frame, an elastic base and a vibration assembly at the bottom of the frame;

[0007] The screen assembly includes a first screen and a second screen. The upper surface of the first screen is provided with deceleration blocking strips, and the upper surface of the second screen is provided with symmetrical isolation blocking strips. The lower surface of the second screen is provided with a steel plate, and the two sides of the steel plate overlap with the two isolation blocking strips without gaps.

[0008] In some embodiments, the screen layer includes an upper region and a lower region; the center of the upper region is designated as a landing area, serving as an aggregate receiving area.

[0009] In some embodiments, the deceleration blocking strip is located at the junction of the upper and lower zones to prolong the residence time of aggregate on the first-layer screen and reduce the downward speed of aggregate in the drop zone; the mesh of the first-layer screen is a square opening with a side length of 37mm.

[0010] In some embodiments, the deceleration blocking strip is composed of an 8V triangular belt rubber strip and an L30 angle steel, and the deceleration blocking strip is tied and fixed to the screen.

[0011] In some embodiments, the mesh size of the second-layer screen is an opening with a side length of 25mm; the two isolation barriers are composed of 8V triangular belts and L30 angle steel, and the isolation barriers are tied and fixed on the second-layer screen, with a distance of 40cm between the isolation barriers and the edge of the frame.

[0012] In some embodiments, a scraping assembly is provided above the screen assembly. The scraping assembly includes a scraper and a drive unit. The drive unit drives the scraper to move back and forth, uniformly distributing the aggregate in the drop area and absorbing part of the impact force of the aggregate.

[0013] In some embodiments, the telescopic end of the drive unit is provided with a buffer member, which is fixedly connected to the scraper member through a push rod to reduce the impact of vibration on the drive unit; the bottom of the scraper member is provided with a spring, and a limiting cylinder with a diameter larger than the push rod is sleeved on the push rod, and the spring and the limiting cylinder provide limiting support for the scraper member and the push rod.

[0014] In some embodiments, the scraper includes a frame and a support rib, the frame and the support rib being detachably installed to control the density of the support rib.

[0015] Compared with the prior art, the present invention provides a one-time production system for mixed graded aggregates, which has the following beneficial effects.

[0016] 1. This utility model, through the collaborative design of double-layer screens and the closed area structure of the two-layer screens, enables the production system to directly produce qualified mixed graded aggregates of 0.075-37.5mm, completely eliminating the manual mixing step in the traditional process, greatly improving the production efficiency of the mixed aggregates, while ensuring that the gradation stability is controlled within ±5%, meeting the needs of production and use.

[0017] 2. With this utility model, one production line can simultaneously output four specifications of aggregate: mixed aggregate (No. 1 belt), 10-15mm (No. 2 belt), 5-10mm (No. 3 belt), and 0-5mm (No. 4 belt), which can meet the different needs of road base, intermediate layer and surface layer, and greatly improve the utilization rate of equipment.

[0018] 3. In this utility model, the setting of the deceleration blocking strip (8V V-belt + L30 angle steel) reduces the aggregate flow rate, significantly improves the fine aggregate passing rate of the two-layer screen, and realizes automatic grading on the two-layer screen by utilizing the inertia of the aggregate, and ensures the stable proportion of fine aggregate in the mixture.

[0019] 4. This utility model, by optimizing crushing parameters (jaw crusher with 8.5cm opening + cone crusher with 1.8cm closed edge) and screening process, reduces the overall energy consumption of the system, and the daily output can reach 900 cubic meters, which is 3 times higher than the traditional process. At the same time, it reduces the equipment footprint.

[0020] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the frame and screen assembly of this utility model.

[0022] Figure 2 This is a top view of the structure of the single-layer screen of this utility model.

[0023] Figure 3 This is a top view of the structure of the two-layer screen of this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the single-layer and double-layer screens of this utility model.

[0025] Figure 5 This is a schematic diagram of the scraping assembly of this utility model.

[0026] Figure 6 This utility model Figure 5 A schematic diagram of a local structure.

[0027] Figure 7 This utility model Figure 6 A magnified structural diagram of region A in the middle.

[0028] Figure 8 This utility model Figure 6 Enlarged structural diagram of region B.

[0029] Figure 9 This is a schematic diagram of the gradation crushed stone screening test results of this utility model.

[0030] Figure 10 This is a schematic diagram of the gradation crushed stone screening test curve of this utility model.

[0031] In the diagram: 1. Frame; 2. Screen assembly; 3. Support frame; 4. Elastic base; 5. Vibration assembly; 6. First layer screen; 601. Upper area; 602. Lower area; 6011. Drop point area; 603. Deceleration blocking strip; 7. Second layer screen; 701. Isolation blocking strip; 702. Steel plate; 8. Scraper assembly; 801. Scraper component; 8011. Frame; 8012. Support rib; 8013. Threaded mounting groove; 8014. Internal threaded mounting block; 8015. Spring; 802. Drive unit; 8021. Buffer component; 8022. Push rod; 8023. Limiting cylinder. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] Example 1

[0034] Reference Figure 1-10 A one-time production mixed graded aggregate system includes a frame 1, a screen assembly 2 on the inner side of the frame 1, a support frame 3 below the frame 1, and an elastic base 4 and a vibration assembly 5 between the support frame 3 and the frame 1.

[0035] As a type of vibration component 5, the vibration component 5 includes a vibration motor and a connecting wheel located in the middle of the frame 1. The vibration motor is movably connected to the connecting wheel via a belt. After the vibration motor in the vibration component 5 is started, it works with the elastic base 4 to drive the frame 1 and the screen assembly 2 to vibrate.

[0036] The frame 1 and the screen assembly 2 are arranged at an angle. When the frame 1 and the screen assembly 2 vibrate, the aggregate flows downward along the inclined surface of the screen assembly 2. A No. 1 belt is provided at the discharge port at the bottom of the frame 1 and the screen assembly 2 to receive the mixed aggregate falling from the screen assembly 2.

[0037] The screen assembly 2 includes a first-layer screen 6 and a second-layer screen 7. The first-layer screen 6 is the first-stage first-layer screen, and the second-layer screen 7 is the first-stage second-layer screen.

[0038] The first layer of screen 6 is located on top of the second layer of screen 7. The first layer of screen 6 includes an upper area 601 and a lower area 602. The center of the upper area 601 is set as the landing point area 6011. The upper surface of the first layer of screen 6 is provided with a deceleration blocking strip 603.

[0039] The deceleration blocking strip 603 is located at 1 / 3 of the length of the first layer of screen 6, that is, at the junction of the upper area 601 and the lower area 602. The deceleration blocking strip 603 is composed of 8V triangular rubber strip and L30 angle steel. The angle steel is tied and fixed on the screen at intervals of 20cm with 6-8mm diameter round steel or No. 8 iron wire.

[0040] Optionally, both the first-layer screen 6 and the second-layer screen 7 are 6.5m × 2.4m in size. The first-layer screen 6 has square openings with a side length of 37mm, and the particle size of the feed is less than 37.5mm.

[0041] The deceleration and blocking strip 603 includes transverse blocking strips and oblique blocking strips. The transverse blocking strips are perpendicular to the aggregate flow direction and are used to forcibly decelerate the aggregate. By reducing the aggregate flow velocity, the residence time of the aggregate on the first-layer screen 6 is extended, allowing fine aggregates to fully pass through the mesh of the first-layer screen 6. This prevents fine aggregates, such as sand, from being washed away before they have a chance to pass through the mesh of the first-layer screen 6, thus avoiding fine aggregate loss and affecting the mixture ratio. The oblique blocking strips are used to guide the dispersion of aggregates and improve the utilization rate of the first-layer screen 6.

[0042] The upper surface of the second-layer screen 7 is symmetrically equipped with isolation and blocking strips 701. The lower surface of the second-layer screen 7 is provided with a steel plate 702, which is located between the two isolation and blocking strips 701. The two sides of the steel plate 702 overlap with the two isolation and blocking strips 701 without gaps.

[0043] The two isolation barriers 701 are composed of 8V V-belts and L30 angle steel. The angle steel is tied and fixed to the screen at 20cm intervals with 6-8mm diameter round steel or No. 8 iron wire. The distance between the isolation barrier 701 and the edge of the frame 1 is 40cm.

[0044] The mesh size of the second-layer screen 7 is an opening with a side length of 25mm.

[0045] A 1.6m wide area is left between the two isolation barriers 701. The bottom of this area is completely sealed by a steel plate 702, preventing aggregate from passing through. As the aggregate flows downward along the second-layer screen 7, it can only leak into the area outside the two isolation barriers 701. During this process, large aggregate particles, due to their large weight and inertia, easily bypass the isolation barriers 701 and leak from the edge of the second-layer screen 7 for subsequent crushing or grading processes.

[0046] Fine aggregate is lightweight and is easily blocked or bounced back to the middle area by the isolation barrier 701 when it moves toward the barrier. This preserves the fine aggregate content on the second screen 7, ensuring that the proportion of fine sand in the final mixed aggregate meets the standard and preventing asphalt concrete from cracking due to "lack of sand".

[0047] In this invention, the discharge distance between the cone crusher and the jaw crusher is first adjusted, reducing the jaw crusher system opening from 10cm to 8.5cm. This reduces the discharge diameter in the coarse crushing stage and controls the maximum output aggregate size; the 8.5cm jaw crusher opening ensures that most aggregates are ≤80mm.

[0048] The closed edge of the cone crusher was adjusted from 2.2cm to 1.8cm. This reduced the minimum discharge gap in the intermediate crushing stage and increased the proportion of fine aggregate. After secondary crushing by the cone crusher, the proportion of aggregate >37mm was significantly reduced, improving the efficiency of the first-layer screen 6 and ensuring that the mixture sliding onto the No. 1 conveyor belt on the second-layer screen 7 naturally contains sufficient fine aggregate.

[0049] When the system is running, the vibration component 5 starts and drives the frame 1 and the screen component 2 to vibrate. The landing area 6011 of the first screen 6 receives the mixed aggregate after two stages of crushing by the jaw crusher and the cone crusher. The aggregate larger than 37mm in the mixed aggregate is intercepted at the bottom of the first screen 6 and guided to the vertical shaft crusher for secondary crushing. The aggregate smaller than 37mm in the mixed aggregate is decelerated by the deceleration blocking strip 603, so that the fine aggregate can fully pass through the mesh of the first screen 6 and fall to the second screen 7.

[0050] Larger aggregates in the second-layer screen 7 continue to slide downwards along the second-layer screen 7. Among the larger aggregates on the upper surface of the second-layer screen 7, the portion of aggregates <25mm passes through the open area at the edge of the second-layer screen 7 after bypassing the restriction of the isolation barrier 701, and falls to the vertical shaft crusher for secondary crushing after passing through the 25mm opening. The portion of aggregates >25mm slides into the first conveyor belt along with the fine aggregates in the closed area in the middle of the second-layer screen 7, and a 0.075-37.5mm mixed gradation is obtained on the first conveyor belt.

[0051] The aggregates after being crushed by the vertical shaft impact crusher are then screened by a screening device, preferably a three-stage vibrating screen, which classifies the aggregates according to their particle size. For example, 10-15mm aggregates are conveyed to the second belt conveyor, 5-10mm aggregates are conveyed to the third belt conveyor, and 0-5mm aggregates are conveyed to the fourth belt conveyor.

[0052] Depending on the application, the 10-15mm aggregate from belt #2 can be used in the aggregate layer of asphalt concrete, the 5-10mm aggregate from belt #3 can be used as fine aggregate in the asphalt surface layer, and the 0-5mm aggregate from belt #4 can be used as filler or alone.

[0053] This system breaks away from traditional aggregate processing procedures. Conveyor belt 1 can directly produce 0.075-37.5mm mixed gradation aggregates, conveyor belt 2 produces 10-15mm aggregates, conveyor belt 3 produces 5-10mm aggregates, and conveyor belt 4 produces 0-5mm fine aggregates. A single production line can simultaneously meet the needs of various materials such as road base courses, asphalt surface treatment, and surface courses, achieving cost reduction, efficiency improvement, and controllable quality and schedule. The aggregates produced by this system have a uniform particle size distribution and a perfect ratio of coarse to fine aggregates, with a daily production capacity of up to 900 cubic meters, increasing system efficiency by nearly three times.

[0054] The improved aggregate processing of this system directly eliminates the on-site mixing process, saving a significant amount of equipment and related labor costs each month.

[0055] Example 2

[0056] In this embodiment, as an optional solution of the above embodiments, a scraper assembly 8 is provided above the screen assembly 2. The scraper assembly 8 is used to evenly distribute the aggregate in the drop point area 6011 of a layer of screen 6, so as to solve the problem of uneven thickness of the aggregate in the drop point area 6011. By improving the uniformity of the aggregate in the drop point area 6011, the throughput of fine aggregate can be accelerated.

[0057] As one embodiment of the scraping assembly 8, the scraping assembly 8 includes a scraper 801 and a drive unit 802. The scraper 801 moves back and forth along the aggregate flow direction and is located above the landing area 6011. The drive unit 802 can be a cylinder, which drives the scraper 801 to move back and forth, spreading the aggregate near the landing area 6011.

[0058] Furthermore, a buffer 8021 can be provided at the telescopic end of the drive unit 802. The buffer 8021 can be made of polyurethane elastic material. The end of the buffer 8021 away from the drive unit 802 is fixedly connected to the scraper 801 through a push rod 8022. When the scraper 801 is subjected to a downward impact, the elastic buffer 8021 prevents the impact force from being directly transmitted to the drive unit 802, thus protecting the drive system from overload damage.

[0059] Among them, as a type of scraper 801, scraper 801 includes a frame 8011 and a support rib 8012. The support rib 8012 is located inside the frame 8011. The scraper 801 can absorb part of the impact force when the aggregate falls downward, providing protection for the upper area 601 of the first layer of screen 6 and reducing the risk of loosening of the binding points of the deceleration blocking strip 603.

[0060] Furthermore, the support rib 8012 can be detachably connected to the frame 8011, allowing for immediate maintenance and replacement of the support rib 8012. Specifically, a threaded mounting groove 8013 is provided on the inner side of the frame 8011, and internally threaded mounting blocks 8014 are provided at both ends of the support rib 8012. Multiple threaded mounting grooves 8013 are provided to cooperate with the internally threaded mounting blocks 8014 for installing multiple support ribs 8012. The multiple threaded mounting grooves 8013 allow for flexible adjustment of the number and density of support ribs 8012 according to usage needs, serving as an optional solution to adapt to different materials and improve adaptability in later applications.

[0061] As a supplement, a spring 8015 can be provided at the bottom of the frame 8011. Under normal conditions, the bottom end of the spring 8015 is in contact with the upper surface of the screen 6. A limiting cylinder 8023 is sleeved on the push rod 8022, and the inner diameter of the limiting cylinder 8023 is larger than the diameter of the push rod 8022. The spring 8015 and the limiting cylinder 8023 provide limiting support for the scraper 801 and the push rod 8022.

[0062] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A one-time production system for mixed graded aggregates, comprising a frame (1), characterized in that, The inner side of the frame (1) is provided with a screen assembly (2), and the lower part of the frame (1) has an elastic base (4) and a vibration assembly (5). The screen assembly (2) includes a first screen (6) and a second screen (7). The upper surface of the first screen (6) is provided with a deceleration blocking strip (603). The upper surface of the second screen (7) is provided with symmetrical isolation blocking strips (701). The lower surface of the second screen (7) is provided with a steel plate (702). The two sides of the steel plate (702) overlap with the two isolation blocking strips (701) without gaps.

2. The one-time production system for mixed-graded aggregates according to claim 1, characterized in that, The first layer of screen (6) includes an upper area (601) and a lower area (602); the center of the upper area (601) is set as a landing area (6011) as an aggregate receiving area.

3. The one-time production system for mixed-graded aggregates according to claim 2, characterized in that, The deceleration barrier (603) is located at the junction of the upper area (601) and the lower area (602) to extend the residence time of the aggregate on the first layer of screen (6) and reduce the downward speed of the aggregate in the drop point area (6011); the mesh of the first layer of screen (6) is a square opening with a side length of 37mm.

4. The one-time production system for mixed-graded aggregates according to claim 3, characterized in that, The deceleration blocking strip (603) is composed of an 8V triangular belt rubber strip and an L30 angle steel, and the deceleration blocking strip (603) is tied and fixed to the screen.

5. The one-time production system for mixed-graded aggregates according to claim 4, characterized in that, The mesh size of the second-layer screen (7) is an opening with a side length of 25mm; the two isolation barriers (701) are composed of 8V triangular belts and L30 angle steel. The isolation barriers (701) are tied and fixed on the second-layer screen (7). The distance between the isolation barriers (701) and the edge of the frame (1) is 40cm.

6. The one-time production system for mixed-graded aggregates according to claim 1, characterized in that, The screen assembly (2) is provided with a scraper assembly (8) above it. The scraper assembly (8) includes a scraper (801) and a drive unit (802). The drive unit (802) drives the scraper (801) to move back and forth, evenly distributing the aggregate in the landing area (6011) and absorbing part of the impact force of the aggregate.

7. The one-time production system for mixed-graded aggregates according to claim 6, characterized in that, The telescopic end of the drive unit (802) is provided with a buffer (8021). The buffer (8021) is fixedly connected to the scraper (801) through the push rod (8022) to reduce the impact of vibration on the drive unit (802). The bottom of the scraper (801) is provided with a spring (8015). A limiting cylinder (8023) with a diameter larger than the push rod (8022) is sleeved on the push rod (8022). The spring (8015) and the limiting cylinder (8023) provide limiting support for the scraper (801) and the push rod (8022).

8. The one-time production system for mixed-graded aggregates according to claim 7, characterized in that, The scraper (801) includes a frame (8011) and a support rib (8012). The frame (8011) and the support rib (8012) are detachably installed to control the density of the support rib (8012).

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