Iron ore stationary grizzly for open pit mining

Abstract

The utility model provides a kind of iron ore fixed grid screen for open pit ore dressing, including crossbeam, longitudinal beam, revetment, support protection device, seamless wear-resistant steel pipe;700mm×700mm grid-like screening frame formed by grid screen crossbeam and grid screen longitudinal beam welding;Inclined revetment fixed in the front end of grid screen, inclination angle 15°~30°, for buffering ore impact;4 root φ273×8000×28mm seamless wear-resistant steel pipe laid in the top of grid screen crossbeam, replaceable connection by 4 groups of clamping plate bolt;And high manganese steel support protection device welded in the intersection node of crossbeam and longitudinal beam, thickness 40-50mm and surface quenching treatment.The utility model optimizes structure design, effectively disperses ore falling impact force, reduces frame abrasion deformation, prolongs service life;While improve screening efficiency, accurately control into broken ore granularity, reduce subsequent crushing equipment energy consumption and maintenance cost, adapt to open pit ore dressing working condition requirement.

Description

Technical Field

[0001] This utility model relates to the field of open-pit mineral processing equipment, and more particularly to a fixed grid screen for iron ore used in open-pit mineral processing. Background Technology

[0002] Iron ore, as a fundamental raw material for the steel industry, requires beneficiation and processing to be transformed into usable smelting raw materials. Crushing is a crucial step in achieving pre-selection and tailings disposal, improving ore grade, and reducing harmful impurities. In open-pit ore beneficiation for coarse crushing, raw ore is typically transported by truck to the beneficiation plant and unloaded onto a fixed screen above the ore receiving bin for preliminary screening. Traditional fixed screens present several problems in practical use: Firstly, the large vertical distance between the dump truck bed and the screen during unloading causes the ore to fall directly, resulting in a strong impact and leading to screen deformation and breakage, significantly shortening its service life. Secondly, larger ore particles easily become stuck at the crusher feed inlet, requiring manual unblocking operations, which is not only dangerous but also disrupts production continuity. Furthermore, low screening efficiency and inaccurate ore particle size control exacerbate wear on subsequent crushing equipment, increasing maintenance costs and hindering overall production efficiency.

[0003] Therefore, it is urgent to optimize the structure of the fixed grid screen to improve its impact resistance, wear resistance and screening efficiency, so as to adapt to the long-term stable operation under the harsh working conditions of open-pit mining. Utility Model Content

[0004] To address the aforementioned technical problems, a fixed grid screen for iron ore processing in open-pit mines is provided. This invention utilizes a grid frame formed by welding the screen's crossbeams and longitudinal beams, combined with an inclined slope to buffer impact, a seamless wear-resistant steel pipe structure for easy replacement, and supporting protective devices, achieving impact resistance, wear resistance, and high-efficiency screening.

[0005] To achieve the above objectives, this utility model provides a fixed grid screen for iron ore in open-pit beneficiation, comprising crossbeams, longitudinal beams, slope protection, support and protection devices, and seamless wear-resistant steel pipes; Several parallel grid screen beams and several parallel grid screen longitudinal beams intersect each other perpendicularly and are welded and fixed to form a grid-like screening frame; The slope protection is fixedly connected to the front edge of the fixed screen. The slope protection extends along the length of the screen, and its height is consistent with the overall height of the fixed screen. It is also inclined towards the direction of ore unloading. Several seamless wear-resistant steel pipes are laid above the grid screen crossbeam, and each seamless wear-resistant steel pipe is clamped to the grid screen crossbeam by multiple sets of clamps; The support and protection device is fixedly installed at the vertical intersection of the screen crossbeam and the screen longitudinal beam. The support and protection device is a square wear-resistant steel plate component, which forms a 45° angle with the screen crossbeam and the screen longitudinal beam, and is welded and fixed to the screen crossbeam and the screen longitudinal beam to form a diagonal support and protection structure.

[0006] Furthermore, the slope protection has an inclination angle of 15° to 30°.

[0007] Furthermore, the number of seamless wear-resistant steel pipes is 8, and their specifications are φ273×8000×28mm.

[0008] Furthermore, the mesh aperture of the mesh-like screening frame is 700mm x 700mm.

[0009] Furthermore, the support and protective device is made of high manganese steel wear-resistant plate with a thickness of 40-50mm, and its surface is quenched to improve surface hardness.

[0010] Furthermore, the slope protection is used to guide the ore to slide down the slope onto the screen body, thereby buffering and reducing the direct impact of the ore on the screen.

[0011] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: 1. This utility model provides a fixed grid screen for iron ore in open-pit mining. Through the design of a 700mm×700mm grid aperture, inclined slope to buffer impact, and 45° high manganese steel support and protection device, it effectively disperses the impact force of falling ore, reduces the deformation and breakage of the grid screen beams and longitudinal beams, and extends the service life of the equipment.

[0012] 2. This utility model provides a fixed grid screen for iron ore used in open-pit ore beneficiation. Seamless wear-resistant steel pipes are laid above the crossbeams. Combined with precise grid screening, it ensures that 0-700mm ore passes through efficiently, avoids 700-950mm ore from clogging the crusher feed port, and optimizes the load of subsequent crushing processes.

[0013] 3. The present invention provides a fixed grid screen for iron ore used in open-pit mining. The seamless wear-resistant steel pipe can be quickly replaced by clamps and bolts, reducing downtime. The high manganese steel wear-resistant plate is quenched to enhance surface hardness, reduce frame wear, and significantly reduce spare parts replacement and equipment maintenance costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a top view schematic diagram of a fixed grid screen for iron ore used in open-pit mineral processing, as described in this utility model. Figure 2 This is a schematic diagram of the left-hand structure of a fixed grid screen for iron ore used in open-pit mineral processing, as described in this utility model.

[0016] In the diagram: 1. Crossbeam; 2. Longitudinal beam; 3. Slope protection; 4. Support and protection device; 5. Seamless wear-resistant steel pipe; 6. Clamping plate. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0024] like Figures 1 to 2As shown, this utility model provides a fixed grid screen for iron ore in open-pit beneficiation, including a crossbeam 1, a longitudinal beam 2, a slope protection 3, a support and protection device 4, and a seamless wear-resistant steel pipe 5; Several parallel grid screen beams 1 and grid screen longitudinal beams 2 are welded and fixed together in a perpendicular manner to form a grid-like screening frame. The grid aperture is designed to be 700mm×700mm to meet the screening requirements of iron ore and ensure that ore with a particle size requirement of 0~700mm can pass through quickly. A slope protection 3 is fixedly connected to the front edge of the fixed screen. The slope protection 3 extends along the length of the screen and its height is consistent with the overall height of the screen. The slope protection 3 is inclined towards the direction of ore unloading, and the inclination angle is controlled within the range of 15°~30°. This design guides the ore to slide down the slope, buffers the impact force of the ore falling after the dump truck is lifted, and reduces the direct impact on the screen. Several seamless wear-resistant steel pipes 5 are laid above the grid screen beam 1. Each seamless wear-resistant steel pipe 5 is clamped to the grid screen beam 1 by four sets of clamps 6. The seamless wear-resistant steel pipes 5 and the high manganese steel support and protection device 4 directly bear the impact and friction of the ore, extending the service life of the equipment. The support and protection device 4 is fixedly installed at the vertical intersection of the screen crossbeam 1 and the screen longitudinal beam 2. This device is made of 40-50mm thick high-manganese steel wear-resistant plate, with the surface hardened to increase hardness. The support and protection device 4 forms a 45° angle with both the crossbeam 1 and the longitudinal beam 2, creating a diagonal support and protection structure. This structure disperses the impact force of falling ore, enhances the overall strength of the screen, and directly withstands the friction from the loader bucket, reducing wear and deformation of the grid frame.

[0025] Furthermore, the number of seamless wear-resistant steel pipes 5 is four, with specifications of φ273×8000×28mm. Each steel pipe is clamped to the crossbeam 1 by four sets of clamping plates 6. As a wear-prone component, the seamless steel pipe can be replaced by crane when it wears to a certain degree, protecting the lower crossbeam 1, longitudinal beam 2, and supporting protective device 4 from direct impact and wear from ore.

[0026] Furthermore, the mesh aperture of the mesh-like screening frame is 700mm x 700mm.

[0027] Furthermore, the support and protection device 4 is made of high manganese steel wear-resistant plate with a thickness of 40-50mm, and its surface is quenched to improve surface hardness.

[0028] Furthermore, the slope protection 3 is used to guide the ore to slide down the slope onto the screen body, so as to buffer and reduce the direct impact of the ore on the screen.

[0029] Detailed implementation process of this device: After the iron ore is transported from the mining area to the beneficiation plant by truck, the ore slides down the inclined slope of the retaining wall 3 onto the fixed screen body when the dump truck lifts its cargo box. The retaining wall 3 buffers the impact force generated by the vertical fall of the ore, reducing the direct impact on the grid-like screening frame. After the ore enters the 700mm×700mm grid screen frame formed by welding the screen crossbeams 1 and longitudinal beams 2, large-diameter ore particles larger than 950mm are blocked and removed by the long-arm hydraulic breaker for secondary crushing, while ore particles of 0~700mm fall through the screen holes into the receiving bin. Seamless wear-resistant steel pipes 5 are laid above the crossbeams 1 and are connected to the pipes by clamps 6 and bolts, directly bearing the impact and friction of the ore. After wear, they can be hoisted and replaced to protect the crossbeams 1, longitudinal beams 2, and supporting protective devices 4. The support and protection device 4 is made of 40-50mm high-manganese steel wear-resistant plate, welded at a 45° angle to the intersection of the crossbeam 1 and the longitudinal beam 2, forming a diagonal support structure. This disperses the impact force of falling ore and resists friction from the loader bucket, extending the frame's lifespan. Finally, ore that meets the particle size requirements enters the subsequent crushing process, reducing the load on the jaw crusher and achieving efficient and stable operation of the coarse crushing stage.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fixed grid screen for iron ore beneficiation in open-pit mines, characterized in that, include: Horizontal beams, longitudinal beams, slope protection, support and protection devices, seamless wear-resistant steel pipes; A number of parallel grid screen beams (1) and a number of parallel grid screen longitudinal beams (2) intersect each other perpendicularly and are welded and fixed to form a grid-like screening frame; The slope protection (3) is fixedly connected to the front edge of the fixed grid screen. The slope protection (3) extends along the length of the grid screen, and its height is consistent with the overall height of the fixed grid screen. It is also inclined towards the direction of ore unloading. Several seamless wear-resistant steel pipes (5) are laid on the screen beam (1), and each seamless wear-resistant steel pipe (5) is clamped to the screen beam (1) by multiple sets of clamps; The support and protection device is fixedly installed at the vertical intersection of the cross beam (1) and the longitudinal beam (2) of the screen. The support and protection device (4) is a square wear-resistant steel plate component. It forms a 45° angle with the cross beam (1) and the longitudinal beam (2), and is welded and fixed to the cross beam (1) and the longitudinal beam (2) to form a diagonal support and protection structure.

2. A fixed grid screen for iron ore in open-pit beneficiation according to claim 1, characterized in that, The slope protection (3) has an inclination angle of 15°~30°.

3. A fixed grid screen for iron ore in open-pit beneficiation according to claim 1, characterized in that, The number of seamless wear-resistant steel pipes (5) is 8, and their specifications are φ273×8000×28mm.

4. A fixed grid screen for iron ore in open-pit beneficiation according to claim 1, characterized in that, The mesh size of the mesh screening frame is 700mm x 700mm.

5. A fixed grid screen for iron ore in open-pit beneficiation according to claim 1, characterized in that, The support and protection device (4) is made of high manganese steel wear-resistant plate with a thickness of 40-50mm, and its surface is quenched to improve surface hardness.

6. A fixed grid screen for iron ore in open-pit beneficiation according to claim 1, characterized in that, The slope protection (3) is used to guide the ore to slide down the slope to the main body of the screen, so as to buffer and reduce the direct impact of the ore on the screen.

Images