Dam aggregate production coarse crushing system pre-screening device

Abstract

The utility model discloses a dam aggregate production coarse crushing e break system pre -screening device relates to water conservancy and hydropower engineering aggregate production technical field, including screen cloth, is equipped with the screen hole for screening aggregate, the support platform upper end surface is used for the shovel car to and fro conveyance to be screened aggregate, and the screen cloth one end is inclined and is established on the support platform one longitudinal side wall upper end position, and the other end bottom wall is vertically welded with longitudinal height -increasing board, and the area between support platform and longitudinal height -increasing board below screen cloth is small granular aggregate receiving area, and the side of longitudinal height -increasing board facing away from support platform is large granular aggregate receiving area, the upper end both long -sides of screen cloth are all provided with the baffle, and a plurality of detachable material spreading plates are arranged between the two baffles, and the material spreading plate bottom wall and screen cloth are left with the material falling gap. The utility model discloses through setting pre -screening device, prevents the condition of causing the material blockage because of the particle size, and the e break material blockage frequency is reduced greatly, improves the production efficiency of semi -finished product aggregate, and simultaneously does not need the manpower investment in large quantities.

Description

Technical Field

[0001] This utility model relates to the field of aggregate production technology for water conservancy and hydropower projects, specifically a pre-screening device for a coarse crushing jaw crusher system for dam aggregate production. Background Technology

[0002] In the production of aggregates for hydropower dams, natural riverbed materials, containing a large amount of gravel and boulders with a particle size >200mm, are prone to clogging when directly fed into jaw crushers. This leads to crusher shutdowns due to clogging, reduced production efficiency, and uneven particle size in the semi-finished aggregates, affecting the quality of subsequent processes. Furthermore, the repeated impact of large pieces of material on the jaw crusher's jaw plates exacerbates equipment wear. Traditional solutions often involve manual sorting or secondary crushing, but these are inefficient and costly. Therefore, there is an urgent need for an efficient and low-cost anti-clogging pretreatment solution that uses a pre-screening device to solve the clogging problem while simultaneously improving the production efficiency of semi-finished aggregates. Utility Model Content

[0003] The purpose of this utility model is to provide a pre-screening device for a coarse crushing jaw crusher system in dam aggregate production, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a pre-screening device for a coarse crushing jaw crusher system for dam aggregate production, including a screen, the screen being inclined and having screen holes for screening aggregate; A support platform, the upper surface of which is used for a loader to transport aggregate to be screened back and forth, and one end of the screen is inclinedly set at the upper end of one longitudinal side wall of the support platform, and the other end of the bottom wall is vertically welded with a longitudinal heightening plate. The area below the screen between the support platform and the longitudinal heightening plate is the small aggregate receiving area, and the side of the longitudinal heightening plate opposite to the support platform is the large aggregate receiving area. Material baffles are provided on the two long side walls at the top of the screen, and multiple detachable material spreading plates are provided between the two material baffles. A material drop gap is left between the bottom wall of the material spreading plate and the screen.

[0005] In a further embodiment, the sieve holes are rectangular in shape, and the length and width of the sieve holes are both 200 mm.

[0006] In a further embodiment, the support platform has horizontal beams fixed on both sides of the longitudinal sidewall facing the screen, and insertion holes are provided on the beams. An insertion rod is vertically welded to the end of the bottom wall of the screen away from the longitudinal heightening plate, and the insertion rod is inserted into the insertion hole.

[0007] In a further embodiment, a plurality of rotating shafts are rotatably provided between the two baffle plates. Two through holes are opened on the radial outer wall of the rotating shafts. A connecting rod is inserted into the through hole. A threaded groove is opened on the upper surface of the material spreader plate. The bottom end of the connecting rod extends out of the through hole and is threadedly connected to the threaded groove.

[0008] In a further embodiment, the side wall of the material spreading plate facing the support platform is provided with an inclined surface, which gradually narrows from top to bottom and overlaps with the bottom wall of the material spreading plate to form a narrow edge.

[0009] In a further embodiment, a threaded rod is fixed to the upper end of the connecting rod, and a counterweight disc is threadedly connected to the threaded rod.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This utility model relates to a pre-screening device for a jaw crusher system used in dam aggregate production. By setting up a pre-screening device, it eliminates material blockage caused by particle size, significantly reducing the frequency of jaw crusher blockage. At the same time, it achieves automated pre-screening, requiring no large amount of manpower. It has a simple structure and low operating cost, and can quickly and efficiently complete the pre-screening of aggregates, significantly improving production efficiency and reducing production costs. It also solves the problems of material blockage and guard plate wear that occur in the production of semi-finished materials from riverbed materials, thereby improving the production efficiency of semi-finished materials. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the improved screen structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of a further improved screen structure according to an embodiment of the present utility model; Figure 4 This is an embodiment of the present utility model. Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the disassembled structure of the material spreader and connecting rod according to an embodiment of the present utility model.

[0012] In the diagram: 1. Support platform; 2. Crossbeam; 3. Screen; 4. Longitudinal heightening plate; 5. Baffle plate; 6. Insertion rod; 7. Rotating shaft; 8. Connecting rod; 9. Spreading plate; 10. Threaded rod; 11. Counterweight plate. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In this example, for natural riverbed material, the particle size is too large, which can easily cause material blockage during the production process. Moreover, large-particle riverbed material does not break after repeated scouring in nature, and its hardness is high, which causes rapid wear on equipment, such as the wear of equipment guard plates, affecting normal use. By using a pre-screening system, the production efficiency of semi-finished material can be improved, providing raw materials for dam construction.

[0015] Therefore, this embodiment provides a pre-screening device for a coarse jaw crusher system in dam aggregate production, such as... Figure 1 As shown, it includes a screen 3, which is inclined and has sieve holes for screening aggregates.

[0016] Support platform 1 was also disclosed. Support platform 1 is constructed of reinforced concrete. Its upper surface is used by the loader to transport the aggregate to be screened back and forth. The size and location of support platform 1 are determined according to the actual needs of the production site. Support platform 1 is constructed using concrete or steel to ensure it has sufficient strength and stability to withstand the weight of the aggregate being transported by the loader. The upper surface of support platform 1 should be flat and smooth to allow for smooth loader movement.

[0017] like Figure 2 As shown, one end of the screen 3 is inclined and positioned at the upper end of one longitudinal sidewall of the support platform 1. Horizontal beams 2 are fixed to both sides of the longitudinal sidewall of the support platform 1 facing the screen 3. Insertion holes are provided on the beams 2. An insertion rod 6 is vertically welded to the bottom wall of the screen 3 at the end away from the longitudinal extension plate 4, and the insertion rod 6 is inserted into the insertion hole. The other end of the bottom wall of the screen 3 is vertically welded to the longitudinal extension plate 4. The screen 3 is installed as shown in the diagram. Figure 1 As shown, screen 3 is in an inclined state and is used for screening aggregates.

[0018] It should be noted that the area below the screen 3 between the support platform 1 and the longitudinal heightening plate 4 is the small aggregate receiving area, while the side of the longitudinal heightening plate 4 facing away from the support platform 1 is the large aggregate receiving area.

[0019] Furthermore, the sieve holes have a rectangular structure, and the length and width of the sieve holes are both 200mm.

[0020] During the mining of riverbed material, the pre-screening device of the coarse jaw crusher system is placed in the transfer yard. During the mining of riverbed material, the backhoe driver, dump truck driver, and inspectors will observe the particle size of each truckload of riverbed material. Riverbed material with a particle size greater than 200mm exceeding 10% will be directly sent to the transfer yard for screening using screen 2. The small aggregate particles after screening fall into the small aggregate receiving area, and are then loaded onto trucks by loaders and transported to the jaw crusher to produce semi-synthetic materials.

[0021] For materials with a particle size greater than 200mm, they will roll down from top to bottom along screen 2 to the large aggregate receiving area. They will then be transported out by dump truck for use in filling riverbeds or for some areas requiring large stone filling. By separating the large aggregate through screening, the amount of large material entering the jaw crusher is reduced, thereby reducing the impact of large material on the jaw crusher teeth, effectively slowing down the wear rate of the equipment, extending the service life of the equipment, and reducing the maintenance and replacement costs of the equipment.

[0022] Furthermore, such as Figure 3 , Figure 4 and Figure 5 As shown, baffle plates 5 are provided on the two long side walls at the upper end of the screen 3, and multiple detachable spreading plates 9 are provided between the two baffle plates 5.

[0023] Specifically, multiple rotating shafts 7 are rotatably arranged between the two baffle plates 5. Two through holes are formed on the radial outer wall of each rotating shaft 7, and connecting rods 8 are inserted into these holes. A threaded groove is formed on the upper surface of the spreading plate 9. The bottom end of the connecting rod 8 extends out of the through hole and is threadedly connected to the threaded groove. The rotating shafts 7 can rotate freely between the two baffle plates 5. The connecting rods 8 connect the spreading plates 9, allowing them to be distributed in an elevated position. A 200mm gap is left between the bottom wall of the spreading plate 9 and the screen 3 to allow aggregate to pass smoothly. The spreading plates 9 act as temporary barriers, preventing the aggregate from rolling rapidly down the screen 2 and causing small aggregate particles to fall into the receiving area of ​​larger aggregate particles due to excessive rolling speed.

[0024] The material spreading plate 9 adopts a detachable design and is connected to the rotating shaft 7 via the connecting rod 8. The position and quantity of the material spreading plate 9 can be adjusted according to actual needs, making operation flexible.

[0025] The side wall of the material spreading plate 9 facing the support platform 1 has an inclined surface, which gradually narrows from top to bottom and overlaps with the bottom wall of the material spreading plate 9 to form a narrow edge. Figure 5 As shown, this facilitates the spreading and flow of aggregates.

[0026] A threaded rod 10 is fixed to the upper end of the connecting rod 8. The threaded rod 10 is threadedly connected to a counterweight plate 11. The counterweight plate 11 can be made of cast iron. The appropriate weight and size of the counterweight plate 11 can be selected according to actual needs. The position of the counterweight plate 11 on the threaded rod 10 can be adjusted by rotating the counterweight plate 11 to adjust the tilt angle of the spreading plate 9 and the spreading effect.

[0027] Usage process: Aggregate transportation: Use a loader to transport the natural riverbed material to be screened to the upper surface of the support platform 1. The loader travels back and forth on the support platform 1 to evenly pour the aggregate onto the screen 3.

[0028] Screening process: After the aggregate falls onto screen 3, due to the inclined setting of screen 3, the aggregate rolls downward along screen 3 under its own weight and the vibration of the loader. During the rolling process, small aggregate particles with a diameter of less than 200mm fall through the screen holes on screen 3 into the small aggregate receiving area located below screen 3 between support platform 1 and longitudinal lifting plate 4; large aggregate particles with a diameter of more than 200mm cannot pass through the screen holes and continue to roll along screen 3, eventually falling into the large aggregate receiving area on the side of longitudinal lifting plate 4 opposite to support platform 1.

[0029] The spreading function of the spreading plate 9 is to even out the aggregate during the rolling process. Because there is a gap between the bottom wall of the spreading plate 9 and the screen 3, some aggregate will pass through this gap. Simultaneously, the inclined surface and rotating design of the spreading plate 9 ensure that the aggregate is more evenly distributed on the screen 3 during rolling, improving screening efficiency. The weight of the counterweight plate 11 can be adjusted according to the properties of the aggregate and screening requirements to ensure that the spreading plate 9 has a suitable inclination angle and spreading force.

[0030] Aggregate collection: After screening, aggregates are collected separately from the small aggregate receiving area and the large aggregate receiving area. Small aggregates can be directly fed into the jaw crusher for crushing, while large aggregates can be subjected to secondary crushing or other treatments depending on the actual situation.

[0031] By installing a pre-screening device, large and small aggregate particles are separated, ensuring a relatively uniform particle size of the aggregate entering the jaw crusher. This effectively avoids material blockage caused by large pieces of material, guaranteeing the continuous and stable operation of the crusher and improving production efficiency. The frequency of jaw crusher blockage has been reduced from twice per day to once per week. Although jaw crusher blockage still occurs, the cause has shifted to insufficient control of the feeding speed, leading to material accumulation and blockage. In other words, the screening system has eliminated blockage caused by particle size. This also improves the production efficiency of semi-finished aggregates and solves the problems of blockage and wear on the guard plates during the production of semi-finished materials from riverbed materials.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-screening device for a jaw crusher system in dam aggregate production, characterized in that, include: Screen (3), the screen (3) is inclined and has screen holes for screening aggregate; Support platform (1), the upper surface of the support platform (1) is used for the loader to transport the aggregate to be screened back and forth. The screen (3) is inclined at one end at the upper end of one longitudinal side wall of the support platform (1), and the bottom wall of the other end is vertically welded with a longitudinal heightening plate (4). The area below the screen (3) between the support platform (1) and the longitudinal heightening plate (4) is the small aggregate receiving area, and the side of the longitudinal heightening plate (4) facing away from the support platform (1) is the large aggregate receiving area. The screen (3) is provided with baffles (5) on the two long side walls at the upper end. There are multiple detachable spreading plates (9) between the two baffles (5). There is a material drop gap between the bottom wall of the spreading plate (9) and the screen (3).

2. The pre-screening device of the coarse crushing jaw crusher system for dam aggregate production according to claim 1, characterized in that, The sieve holes have a rectangular structure, and the length and width of the sieve holes are both 200mm.

3. The pre-screening device for the coarse crushing jaw crusher system in dam aggregate production according to claim 1, characterized in that, The support platform (1) has horizontal beams (2) fixed on both sides of the longitudinal sidewall facing the screen (3). The horizontal beams (2) have insertion holes. The bottom wall of the screen (3) away from the longitudinal heightening plate (4) is vertically welded with an insertion rod (6). The insertion rod (6) is inserted into the insertion hole.

4. The pre-screening device for the coarse crushing jaw crusher system in dam aggregate production according to claim 1, characterized in that, Multiple rotating shafts (7) are provided between the two baffle plates (5). Two through holes are opened on the radial outer wall of the rotating shaft (7). A connecting rod (8) is inserted into the through hole. A threaded groove is opened on the upper surface of the material spreading plate (9). The bottom end of the connecting rod (8) extends out of the through hole and is threadedly connected to the threaded groove.

5. The pre-screening device for the coarse crushing jaw crusher system in dam aggregate production according to claim 4, characterized in that, The material spreading plate (9) has an inclined surface on one side wall facing the support platform (1). The inclined surface gradually narrows from top to bottom and overlaps with the bottom wall of the material spreading plate (9) to form a narrow edge.

6. The pre-screening device for the coarse crushing jaw crusher system in dam aggregate production according to claim 4, characterized in that, The upper end of the connecting rod (8) is fixed with a threaded rod (10), and the threaded rod (10) is threadedly connected to a counterweight plate (11).

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