Protective sleeve device for grizzly screen of draw shaft and use method of protective sleeve device

Abstract

The invention relates to the technical field of mold design, in particular to a draw shaft grizzly protecting sleeve device and a using method. The invention provides a draw shaft grizzly protecting sleeve device. The draw shaft grizzly protecting sleeve device comprises a protecting sleeve body which is integrally formed in a pouring mode. The protective sleeve body comprises a hollow flat plate structure and an annular structure, and the annular structure is arranged on the bottom surface of the flat plate structure; a first opening is formed in the face, located on the near material side, of the flat plate structure, a second opening is formed in the face, away from the near material side, of the annular structure, the inner wall of the annular structure and the inner wall of the flat plate structure are coplanar, and the size of the outer wall of the annular structure is matched with the size of the inner diameter of a gridding grate grid of a draw shaft. The service life of the draw shaft grizzly screen is prolonged on the basis that an original draw shaft grizzly screen is protected, the impact and friction effects of ore on the draw shaft grizzly screen are prevented, large ore blocks can be prevented from falling into the draw shaft from the grate grids, and the phenomenon that an ore drawing opening of the draw shaft is blocked is effectively prevented.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mold design, and in particular to a chute grid screen protective sleeve device and a use method thereof. Background Art

[0002] The existing iron ore is mined using the staged open-pit and subsequent backfill mining method. The ore recovered by blasting needs to be shoveled by a scraper and transported from the mine room to the chute. The ore is lowered into the chute through the chute, and then discharged through the chute discharge port and transported by an electric locomotive to the unloading station and enter the next operation link.

[0003] Large ore blocks the chute opening, preventing ore from being transported properly. This often requires manual work using iron rods to pry or pry the blockage out, posing a significant safety hazard to on-site workers.

[0004] Through on-site work, it was found that the chute screens are often damaged by the impact and friction of the ore. The damaged screen mesh will become larger, causing large pieces of ore to easily fall into the chute, which in turn causes a jam when the ore is discharged. Summary of the Invention

[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, a first aspect of the present disclosure provides a chute grid screen protective sleeve device, comprising:

[0007] One-piece cast protective cover body;

[0008] The protective cover body includes a hollow flat plate structure and an annular structure, and the annular structure is arranged on the bottom surface of the flat plate structure;

[0009] The side of the flat plate structure located near the material is set as a first opening, and the side of the annular structure away from the side near the material is set as a second opening. The inner wall of the annular structure is coplanar with the inner wall of the flat plate structure, and the outer wall size of the annular structure matches the inner diameter size of the grid screen of the chute.

[0010] In a feasible implementation manner, the annular structure is in an inverted cone shape, and the first opening is smaller than the second opening.

[0011] In a feasible implementation manner, the inner wall size of the first opening is set to 700 mm to 800 mm, and the inner wall size of the second opening is set to 850 mm to 900 mm.

[0012] In a feasible implementation manner, the inner wall size of the first opening is set to 800 mm, and the inner wall size of the second opening is set to 900 mm.

[0013] In a feasible embodiment, the thickness of the ring wall of the annular structure is 50 mm to 100 mm.

[0014] In a feasible embodiment, the thickness of the flat plate structure is 20 to 50 mm.

[0015] In a feasible embodiment, the inner wall surface of the annular structure is provided with a wear-resistant coating, and the thickness of the wear-resistant coating is set to 2 to 5 mm.

[0016] In a feasible implementation manner, the flat plate structure is a solid wear-resistant plate.

[0017] In a second aspect of the present disclosure, a method for using a chute grid screen protective cover device is provided, which is applied to the chute grid screen protective cover device, comprising:

[0018] Measure the mesh size of the sieve grate;

[0019] determining the outer wall size of the annular structure of the protective sleeve body based on the grid size;

[0020] integrally casting the flat plate structure and the annular structure of the protective sleeve device;

[0021] The protective sleeve device is embedded into the grid of the sieve grate by a lifting tool;

[0022] Repeat until the grating grid is fully covered by the protective sleeve device.

[0023] In a feasible embodiment, the annular structure is fixed in the grid of the sieve grate by interference fit.

[0024] Compared to the prior art, the present invention has at least the following beneficial effects: the integrally cast protective cover body of the present invention is installed in the chute grid screen grate grid, and after the grid screen protective cover is installed on each chute grid screen grate grid, a complete planar structure is formed, which not only protects the original chute grid screen, but also extends the service life of the chute grid screen and prevents the impact and friction of the ore on the chute grid screen. After the chute grid screen protective cover is installed, the size of the original chute grid screen grate grid becomes smaller, which helps prevent large pieces of ore from falling from the grate grid into the chute, and effectively prevents the occurrence of blockage in the chute ore discharge port. The invention of the chute grid screen protective device can be promoted and applied in the protection of chute grid screens in mines around the world. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the accompanying drawings, the same reference symbols denote the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the top view of the structure of the present disclosure;

[0029] Figure 2 A schematic diagram of the cross-sectional structure of the present disclosure;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention.

[0031] in, Figures 1 to 3 The corresponding relationship between the reference numerals and component names is as follows:

[0032] 100-grid screen grate; 200-grid screen foundation;

[0033] 1-protective sleeve body; 11-flat plate structure; 111-first opening; 12-annular structure; 122-second opening. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0036] At present, the existing iron ore is mined using the staged open-pit followed by backfill mining method. The ore recovered by blasting needs to be shoveled by a shovel loader and transported from the mine room to the chute. The ore is lowered into the chute through the chute, and then discharged through the chute discharge port and transported to the unloading station by an electric locomotive to enter the next operation link.

[0037] Large ore blocks the chute opening, preventing ore from being transported properly. This often requires manual work using iron rods to pry or pry the blockage out, posing a significant safety hazard to on-site workers.

[0038] Through on-site work, it was found that the chute screens are often damaged by the impact and friction of the ore. The damaged screen mesh will become larger, causing large pieces of ore to easily fall into the chute, which in turn causes a jam when the ore is discharged.

[0039] Based on this, the embodiment of the present disclosure provides a chute grid screen protective cover device. The one-piece cast protective cover body 1 of the present disclosure is installed in the chute grid screen grate grid 100. After each chute grid screen grate grid 100 is installed with the protective cover body 1, a complete planar structure will be formed. On the basis of protecting the original chute grid screen, the service life of the chute grid screen is extended to prevent the impact and friction of the ore on the chute grid screen. After the chute grid screen protective cover is installed, the size of the original chute grid screen grate grid becomes smaller, which is conducive to preventing large pieces of ore from falling into the chute from the grate grid, and effectively prevents the occurrence of blockage at the chute ore outlet. The invention of the chute grid screen protective device can be promoted and applied in the protection of chute grid screens in mines around the world.

[0040] The following describes the chute grid screen protective cover device in detail through a specific embodiment:

[0041] Reference Figures 1 to 3 As shown, in the first aspect of the present disclosure, a chute screen protective sleeve device is provided, including an integrally cast protective sleeve body; the protective sleeve body includes a hollow flat plate structure and an annular structure, and the annular structure is arranged on the bottom surface of the flat plate structure; a surface of the flat plate structure located on the material-prone side is set as a first opening, and a surface of the annular structure away from the material-prone side is set as a second opening, the inner wall of the annular structure is coplanar with the inner wall of the flat plate structure, and the outer wall size of the annular structure matches the inner diameter size of the chute screen grate grid.

[0042] The present invention measures the size of the sieve grids 100 of the chute, and specifically designs the protective cover body 1 to be manufactured based on the measured size. Based on the design results, the protective cover body 1 is integrally cast and formed. Through integral casting, the flat plate structure and the annular structure are seamlessly connected, eliminating weak weld points. The outer wall size of the annular interface matches the inner diameter size of the sieve grid 100 of the chute, so that the chute grid screen protective cover device can be well installed in each sieve grid. Materials with strong wear resistance and good compressive strength are selected as casting raw materials for construction.

[0043] Specifically, the protective cover body 1 of the present invention is made of high-strength, wear-resistant and impact-resistant manganese steel. The surface hardness of manganese steel (such as MN13) can jump from the initial HB200 to more than HB500 when impacted, forming a self-reinforced wear-resistant layer, which reduces the wear rate to 1 / 3-1 / 5 of ordinary steel, the single impact energy absorption rate is greater than 85%, and the impact toughness value is ≥150J / cm 2 It can withstand the dynamic load generated by the continuous falling of ore without brittle cracking. Its fatigue life under vibration conditions is 5-8 times longer than that of ordinary carbon steel. In addition, the fluctuation of mechanical properties in the range of -40℃ to 250℃ is less than 10%, avoiding low-temperature brittle cracking or high-temperature softening.

[0044] In some embodiments, the annular structure 12 is in an inverted cone shape, with the first opening 111 being smaller than the second opening 122. The conical structure of the annular structure 12 of the present disclosure forms a flow channel that gradually expands from top to bottom. The conical sidewalls decompose the impact force into axial and radial components, creating a centrifugal diffusion effect when the ore falls, reducing the direct impact force on the grate grid. The size difference between the first opening and the second opening forms an inclination angle of 15°-20°, which conforms to the free-fall trajectory of the ore.

[0045] In some embodiments, the inner wall size of the first opening 111 is set to 700 mm to 800 mm, and the inner wall size of the second opening 122 is set to 850 mm to 900 mm.

[0046] The first opening of the present invention, which is 700 mm to 800 mm, can intercept oversized ore blocks with a diameter of ≥ 650 mm. The second opening 122, which is 850 mm to 900 mm, ensures that more than 95% of qualified ore materials pass through smoothly, and the size gradient forms a natural sliding angle of 15°-18°, reducing the probability of material accumulation. Specifically, the inner wall size of the first opening 111 is set to 800 mm, and the inner wall size of the second opening 122 is set to 900 mm. The second opening 122 of 900 mm can accommodate mixed materials with a powder ore rate of ≤ 20% to pass through without obstruction; the first opening 111 of 800 mm reduces the stress concentration coefficient of the annular structure to 1.2, and the inner diameter of 800 mm reduces the wear rate of the wear-resistant coating to 0.12 mm / 10,000 tons of ore, with a service life of 1.8 times that of the ordinary size. The flared design of the 900 mm lower opening reduces the probability of coating scratch damage.

[0047] In some embodiments, the wall thickness of the annular structure 12 is 50 mm to 100 mm.

[0048] In this embodiment, the wall thickness of the annular structure 12 of the present disclosure is designed to be 50 mm to 100 mm. A 50 mm wall thickness can withstand an impact load of 120 MPa, while a 100 mm wall thickness increases this to 180 MPa, meeting the impact requirements of ore falling in deep chutes. The stress concentration factor is controlled at 1.2-1.5, reducing the risk of fracture by 27% compared to thin-walled structures (<50 mm). Under 50 Hz vibration conditions, an 80 mm wall thickness can attenuate the amplitude to within 0.3 mm, effectively suppressing the resonance effect. Furthermore, when combined with a 0.3-0.6 mm wear-resistant coating, a 50 mm wall thickness substrate reduces the coating wear rate to 0.12 mm / 10,000 tons of ore, while a 100 mm wall thickness can increase this to 0.08 mm / 10,000 tons.

[0049] In some embodiments, the thickness of the flat panel structure 11 ranges from 20 to 50 mm. In this embodiment, the 50 mm thickness achieves a flexural modulus of 180 MPa, a 60% improvement over the 20 mm solution, effectively resisting deformation of the screen area. However, the 20 mm ultra-thin design combined with the metal middle frame still maintains a compressive strength of 120 MPa, meeting the requirements of daily use. Furthermore, the 30-40 mm thickness range allows the resonant frequency to avoid the common interference band of 50 Hz, increasing the amplitude attenuation rate by 35%.

[0050] In some embodiments, the inner wall surface of the annular structure 12 is provided with a wear-resistant coating 111 , and the thickness of the wear-resistant coating 111 is set to 2 to 5 mm.

[0051] In this embodiment, regarding the coating selection, the 5 mm thick WC-12Co coating reduces the wear rate to 0.08 mm / 10,000 tons of ore flow, and the thinner coating (<2 mm) increases the wear life by 3 times; the friction coefficient of the tungsten disulfide (WS2) coating reaches a minimum of 0.07 at a thickness of 3 mm, while maintaining excellent interlayer slip performance. In terms of impact resistance, the 4-5 mm coating can absorb 90% of the impact energy of falling ore, and the substrate stress concentration factor is reduced from 1.5 to 1.1. When the epoxy resin coating is ≥3 mm thick, the resistance to particle erosion is improved by 40%. Specifically, for every 1 mm increase in coating thickness, the substrate fatigue crack growth rate decreases by 35%, and a thickness of 2-3 mm achieves the best balance between wear resistance and material cost. The present disclosure specifically uses tungsten carbide (WC) coating. The hardness of the tungsten carbide (WC) coating reaches 1500-2000 HV, and the wear rate is as low as 0.05 mm / 10,000 tons of ore flow.

[0052] In some embodiments, the flat plate structure 11 is a solid wear-resistant plate. In this embodiment, the solid structure increases bending stiffness by 3-5 times compared to a hollow plate, reduces deformation by 60% under concentrated loads, eliminates weak joints, improves stress distribution uniformity by 40%, and achieves an impact energy absorption rate of up to 85%, making it suitable for high-frequency impact scenarios such as ore falls.

[0053] In a second aspect of the present disclosure, a method for using a chute grid screen protective cover device is provided, which is applied to the chute grid screen protective cover device provided in the first aspect of the present disclosure, comprising:

[0054] S1, measure the size of the mesh 100 of the sieve;

[0055] S2, determining the outer wall size of the annular structure 12 of the protective sleeve body 1 based on the grid size;

[0056] S3, integrally casting the flat plate structure 11 and the annular structure 12 of the protective sleeve device;

[0057] S4, embedding the protective cover device into the sieve grate grid 100 by using a lifting tool;

[0058] S5, repeating the above steps S1 to S4 until the sieve grate grid 100 is completely covered by the protective cover device.

[0059] Specifically, the size of the sieve grate grid 100 can be measured by laser scanning with a grid size error of ≤0.5mm, ensuring that the gap between the annular structure 12 and the grate grid 100 is controlled at 1-2mm. In the process of integral casting, a vacuum casting process can be used to make the density of the manganese steel material reach 99.2%, and the tensile strength is increased by 40%. The lifting tool disclosed in the present invention can be equipped with an electromagnetic lifting system with an automatic centering function, so that the positioning accuracy is ±3mm; or a beam sling (a straight sling), a rigid hanger made of steel, adapted to a 480-600mm grid size, and adjustable sling spacing (range 400-800mm) to meet different grid layouts. Furthermore, the lifting tool can be equipped with an integrated weight limiter and an inclination sensor according to different selections, and the overload alarm response time is <0.5 seconds. The present invention specifically uses an electromagnetic lifting system in conjunction with a beam sling, which can greatly improve the installation efficiency of a single grid.

[0060] In some embodiments, the annular structure 12 is secured within the sieve grate grid 100 via an interference fit. In this embodiment, the annular structure 12 is secured within the sieve grate grid 100 via an interference fit to enhance impact resistance. This interference fit eliminates the need for welding or bolts, significantly reducing installation time for individual components. The modular design also allows for partial replacement, improving maintenance efficiency. The interference fit between the annular structure 12 and the sieve grate grid 100 is set to 0.3-0.5mm, ensuring a contact surface pressure of 50-80MPa, effectively suppressing structural displacement under ore impact. The specific friction coefficient of the mating surface is set to 0.15-0.2, absorbing over 30% of the kinetic energy of the impact.

[0061] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0062] In the description of the present disclosure, it is to be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, cannot be understood as a limitation on the present disclosure.

[0063] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations 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 any one or more embodiments or examples.

[0064] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A chute screen protective cover device, characterized in that: include; One-piece cast protective cover body; The protective cover body includes a hollow flat plate structure and an annular structure, and the annular structure is arranged on the bottom surface of the flat plate structure; The side of the flat plate structure located near the material is set as a first opening, and the side of the annular structure away from the side near the material is set as a second opening. The inner wall of the annular structure is coplanar with the inner wall of the flat plate structure, and the outer wall size of the annular structure matches the inner diameter size of the grid screen of the chute.

2. The chute grid screen protective cover device according to claim 1, characterized in that: The annular structure is in an inverted cone shape, and the first opening is smaller than the second opening.

3. The chute grid screen protective cover device according to claim 1, characterized in that: The inner wall size of the first opening is set to 700 mm to 800 mm, and the inner wall size of the second opening is set to 850 mm to 900 mm.

4. The chute grid screen protective cover device according to claim 3, characterized in that: The inner wall size of the first opening is set to 800 mm, and the inner wall size of the second opening is set to 900 mm.

5. The chute grid screen protective cover device according to claim 1, characterized in that: The thickness of the ring wall of the annular structure is 50 mm to 100 mm.

6. The chute grid screen protective cover device according to claim 1, characterized in that: The thickness of the flat plate structure is 20 to 50 mm.

7. The chute grid screen protective cover device according to claim 1, characterized in that: The inner wall surface of the annular structure is provided with a wear-resistant coating, and the thickness of the wear-resistant coating is set to 2 to 5 mm.

8. The chute grid screen protective cover device according to claim 1, characterized in that: The flat plate structure is a solid wear-resistant plate.

9. A method for using a chute grid screen protective cover device, applied to the chute grid screen protective cover device according to any one of claims 1 to 8, characterized in that: include: Measure the mesh size of the sieve grate; determining the outer wall size of the annular structure of the protective sleeve body based on the grid size; integrally casting the flat plate structure and the annular structure of the protective sleeve device; The protective sleeve device is embedded into the grid of the sieve grate by a lifting tool; Repeat until the grating grid is fully covered by the protective sleeve device.

10. The method for using the chute grid screen protective cover device according to claim 9, characterized in that: The annular structure is fixed in the grid of the sieve grate by interference fit.

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