Anti-blocking draw shaft grizzly structure with inclined inlet

Abstract

The invention provides an anti-blocking draw shaft grizzly structure with an inclined inlet. The anti-blocking draw shaft grizzly structure comprises a plurality of main grid bars and a plurality of connecting grid bars transversely connected with the main grid bars. And the top surface elevation of the main grid bars is higher than that of the connecting grid bars, so that a one-way flow guide sieve channel which only protrudes from the main grid bars is formed on the surface of the grizzly. The main grid bars are sequentially divided into inclined sections and horizontal sections in the ore unloading direction, and the lower ends of the inclined sections are in smooth transition connection with the horizontal sections. The main grid bars are divided into fixed grid bars and movable grid bars which are arranged at intervals, and each movable grid bar is located between every two adjacent fixed grid bars. And the adjusting assembly is triggered in the mode that ores roll down to impact the grid screen surface and used for driving the movable grid bars to relatively move between every two adjacent fixed grid bars in the length direction of the connecting grid bars, and the opening clear distance between every two adjacent main grid bars is adjusted in an adaptive mode. Through gravity diversion, dynamic disturbance and chambering design, the problems that the draw shaft grizzly is prone to being blocked and difficult to clean and maintain are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of screening technology for mining materials, specifically to an inlet-inclined anti-clogging chute screen structure. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] At the entrance of a mine pass, a grid screen is a key facility for controlling the size of the ore pieces being discharged and preventing oversized pieces from clogging the pass. In related technologies, commonly used grid screens are mostly made of horizontally arranged square steel or I-beams welded into a uniform mesh structure.

[0004] However, these traditional structures are often horizontally arranged with equal spacing between the bars, making it easy for large, regularly shaped ore pieces to form stable "arches" on the screen surface, leading to blockages. Furthermore, the sidewalls of traditional square steel sections are vertical, and the top surfaces of the longitudinal and transverse bars are usually flush, making it extremely easy for ore to get stuck at the intersections, resulting in high friction and making cleaning very difficult. In addition, traditional screens are all rigid welded structures with fixed bar spacing. When ore blockage occurs, it can only be forced to break up manually or mechanically, and cannot be actively discharged through its own deformation or movement.

[0005] To address this issue, the present invention provides an inlet-inclined anti-clogging chute screen structure to solve the aforementioned problems. Summary of the Invention

[0006] The main objective of this invention is to provide an inlet inclined anti-clogging chute screen structure that features anti-blocking, self-cleaning, and modular maintenance capabilities.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: an inlet-inclined anti-clogging chute screen structure, which is covered and installed at the chute opening, includes multiple main grid bars and multiple connecting grid bars that are laterally connected to the main grid bars; the top surface elevation of the main grid bars is higher than the top surface elevation of the connecting grid bars, so that the screen surface forms a unidirectional flow channel protruding only by the main grid bars; the main grid bars are divided into inclined sections and horizontal sections along the ore unloading direction, and the lower end of the inclined section smoothly transitions to the horizontal section; the main grid bars are divided into fixed grid bars and moving grid bars arranged at intervals, and each of the moving grid bars is located between every two adjacent fixed grid bars; it also includes an adjustment component, which is triggered by the impact of ore rolling onto the screen surface to drive the moving grid bars to move relative to each other between two adjacent fixed grid bars along the length direction of the connecting grid bars, so as to adapt to the adjustment of the net distance between the openings of adjacent main grid bars.

[0008] Furthermore, the adjustable distance assembly includes a slider disposed on the top side of the connecting grid bar, and a groove that cooperates with the slider is opened at the bottom of the moving grid bar. The groove extends in a direction parallel to the length direction of the connecting grid bar. A sliding rod is disposed in the groove, and the slider is slidably sleeved on the outside of the sliding rod. A first spring is sleeved on the outside of both ends of the sliding rod, and the two ends of each first spring are respectively connected to the corresponding outer wall of the slider and the corresponding groove wall of the groove.

[0009] Furthermore, the slider has a mating groove on its bottom side, and a mating block that engages with the mating groove is provided on the top side of the connecting grid. A second insert rod perpendicular to the top side of the connecting grid is provided on the bottom side of the mating block. A second insertion hole for the second insert rod to pass through is provided on the connecting grid. A second nut that is pressed against the bottom side of the connecting grid is threaded onto the bottom end of the second insert rod. The slider also includes a self-locking component for automatically locking the relative position of the mating block in the mating groove and an unlocking component for releasing the locking state of the mating block in the mating groove.

[0010] Furthermore, the self-locking component includes a retaining bead elastically disposed on the side wall of the docking groove, and a retaining hole that mates with the retaining bead is provided on the outer side wall of the docking block.

[0011] Furthermore, a receiving groove for accommodating the locking bead is provided on the side wall of the docking groove, and a second spring is provided between the end of the locking bead away from the locking hole and the corresponding groove wall of the receiving groove.

[0012] Furthermore, the unlocking assembly includes an operating rod concentrically rotatably inserted into the inner side of the second insert rod. The bottom end of the operating rod extends to the outside of the bottom side of the second insert rod. A transmission rod is inserted into the top end of the operating rod. A spiral groove is axially formed on the inner side of the operating rod. A protrusion that slides with the groove is provided on the outer wall of the transmission rod. The top end of the operating rod extends into the inner side of the docking block and is fixed to the inclined block. The top side of the inclined block is connected to the corresponding side wall of the docking block through a telescopic rod. A vertical plate is fixed inside the docking block. A top rod parallel to the connecting grid is slidably inserted into the vertical plate. One end of the top rod is pressed with the inclined block, and the other end is connected to the top plate. The top plate can extend into the locking hole under the drive of the top rod to press with the locking ball. A third spring is sleeved on the outer side of the top rod. The two ends of the third spring are respectively connected to the corresponding side wall of the top plate and the corresponding side wall of the vertical plate.

[0013] Furthermore, the bottom of the fixed grid bar is provided with a first insert rod perpendicular to the top side of the connecting grid bar, and the connecting grid bar is provided with a first insertion hole for the first insert rod to pass through. The bottom end of the first insert rod is threaded with a first nut that is pressed and engaged with the bottom side of the connecting grid bar.

[0014] Furthermore, the cross-section of the main grid bar is an inverted trapezoidal or T-shaped structure, so that the unidirectional flow channel formed between adjacent main grid bars has an enlarged hole shape with a smaller top and a larger bottom in the vertical cross-section.

[0015] Furthermore, the standard aperture clearance between two adjacent main grid bars is defined as d. The actual aperture clearance between adjacent main grid bars varies randomly or alternately within the range of d ± a, where a is 5%-15% of the standard aperture clearance d.

[0016] Furthermore, the high end of the inclined section is located at the vehicle stopper, and the horizontal section is located at the well ring foundation of the chute at the end away from the inclined section. An elastic buffer pad is provided between the screen and the well ring foundation.

[0017] The beneficial effects of this invention are reflected in: The inlet-inclined anti-clogging chute screen structure of the present invention effectively solves the problems of easy clogging, difficult cleaning, and difficult maintenance of chute screens through gravity guidance, dynamic disturbance, and enlarged hole design. Attached Figure Description

[0018] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 for Figure 1 A top-down view of the overall structure (with one of the moving grid bars in a shifting and pitch-changing state). Figure 3 for Figure 1 A partial cross-sectional view of the structure where both the fixed and moving grid bars are in a locked state after assembly on the connecting grid bars; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 for Figure 1 A partial cross-sectional view of the intermediate moving grid bar in the unlocked state after assembly on the connecting grid bar; Figure 6 for Figure 5 Enlarged structural diagram at point B; Figure 7 for Figure 5 A partial structural diagram showing the distribution of the grooves after the central control lever is extended.

[0019] Explanation of reference numerals in the attached figures: 1. Inclined section; 2. Horizontal section; 3. Fixed grid bar; 4. Moving grid bar; 5. Connecting grid bar; 6. First insert rod; 7. First insertion hole; 8. First nut; 9. Second insert rod; 10. Second insertion hole; 11. Slider; 12. Second nut; 13. Slide groove; 14. Slide rod; 15. Operating rod; 16. Groove; 17. Protrusion; 18. Transmission rod; 19. Inclined block; 20. Telescopic rod; 21. Vertical plate; 22. Top rod; 23. Top plate; 24. Locking bead; 25. Locking hole; 26. Receiving groove; 27. Connecting block; 28. Connecting groove. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] Please combine Figures 1 to 7 The inclined anti-clogging chute screen structure at the inlet covers the chute opening and includes multiple main grid bars and multiple connecting grid bars 5 that connect the main grid bars laterally.

[0022] In this embodiment, the top surface elevation of the main grid bar is higher than the top surface elevation of the connecting grid bar 5 (e.g., a height difference of 30mm-100mm), so that the surface of the grid screen forms a unidirectional flow channel protruding only from the main grid bar, eliminating the bidirectional frictional resistance at the cross intersection of the traditional grid screen, so that the ore only contacts the longitudinal main grid bar, greatly reducing the jamming phenomenon, and thus avoiding the ore being blocked laterally when sliding.

[0023] In order to utilize gravity for flow guidance, the main grid bar is divided into inclined section 1 and horizontal section 2 along the unloading direction. Inclined section 1 is located at the front end (the side where the unloading vehicle enters), with its high end set at the vehicle stop and its low end smoothly connected to horizontal section 2. The end of horizontal section 2 away from inclined section 1 is set at the foundation of the well ring of the ore pass.

[0024] To cushion the impact, an elastic buffer layer (such as scrap conveyor belt or hardwood) is provided between the screen and the well ring foundation.

[0025] It is worth mentioning that, in order to prevent arching, this embodiment divides the main grid bars into fixed grid bars 3 and moving grid bars 4 that are spaced apart, with each moving grid bar 4 located between every two adjacent fixed grid bars 3; The moving grid bar 4 is not directly fixed, but is installed on the connecting grid bar 5 through an adjustment component. The adjustment component is triggered by the ore rolling down and impacting the screen surface, which can drive the moving grid bar 4 to move relative to each other between two adjacent fixed grid bars 3 along the length direction (lateral direction) of the connecting grid bar 5, so as to adjust the net distance between the openings of adjacent main grid bars.

[0026] Define the standard aperture clearance between two adjacent main grid bars as d. The actual aperture clearance between adjacent main grid bars varies randomly or alternately within the range of d ± a, where a is 5%-15% of the standard aperture clearance d. That is, the maximum travel distance of the slider 11 to the left or right in the groove 13 is 5%-15% of the standard aperture clearance d. This non-equidistant distribution disrupts the geometric conditions for the construction of stable arch feet in regular ore.

[0027] To enable the main grid bars to dynamically adjust the spacing between adjacent main grid bars when subjected to the impact of ore rolling, the spacing adjustment component in this embodiment includes a slider 11 disposed on the top side of the connecting grid bar 5. A groove 13, which mates with the slider 11, is provided at the bottom of the moving grid bar 4. The groove 13 extends parallel to the length direction of the connecting grid bar 5. A sliding rod 14 is disposed within the groove 13, and the slider 11 is slidably sleeved on the outside of the sliding rod 14. To provide reset and buffering force, first springs (the exact number of turns is not shown in the figure, but their positions are clear) are sleeved on the outer sides of both ends of the sliding rod 14. The two ends of each first spring are respectively connected to the corresponding outer wall of the slider 11 and the corresponding groove wall of the groove 13.

[0028] Furthermore, due to the high dust levels and harsh environment at the mine site, dust can easily enter the chute 13 and cause the slider 11 to jam. To avoid this situation, in this embodiment, a sliding sealing strip (not shown) is provided around the opening of the chute 13 at the bottom of the moving grid bar 4, so that when the moving grid bar 4 moves relative to the connecting grid bar 5, dust is prevented from entering the chute 13 and causing the slider 11 to jam.

[0029] In use, when a large piece of ore rolls down and impacts the side of the moving grid bar 4, the huge impact force overcomes the resistance of the first spring, driving the moving grid bar 4 to undergo instantaneous lateral displacement relative to the slider 11 below (and the connecting grid bar 5). This displacement changes the distance between the moving grid bar 4 and the adjacent fixed grid bar 3, which can "squeeze" or "bounce" out critical-sized ore stuck in the gap, reducing the probability of ore arching and achieving dynamic anti-blocking.

[0030] In this way, the gravitational force generated by the inclined section 1 is used to accelerate the flow of materials. At the same time, an adjustment component is introduced to cooperate with the moving grid bar 4 and the fixed grid bar 3. The impact energy of the ore itself is used to drive the moving grid bar 4 to move slightly left and right. This dynamic spacing change can effectively disrupt the force balance of the ore, prevent arching and jamming, and achieve self-cleaning.

[0031] In addition, the cross-section of the main grid bars is an inverted trapezoidal or T-shaped structure, which makes the unidirectional flow channel formed between adjacent main grid bars have an enlarged hole shape with a smaller top and a larger bottom in the vertical cross-section, ensuring that the ore is "loosened as soon as it passes through the throat" and preventing wedging. Furthermore, in conjunction with the non-equidistant random spacing distribution of the above-mentioned moving grid bars 4, the possibility of wedging and bridging is further eliminated from the geometric structure.

[0032] In one embodiment, a docking groove 28 is provided on the bottom side of the slider 11, and a docking block 27 is provided on the top side of the connecting grid 5 to engage with the docking groove 28. A second insert rod 9 is provided on the bottom side of the docking block 27, perpendicular to the top side of the connecting grid 5. A second insertion hole 10 is provided on the connecting grid 5 for the second insert rod 9 to pass through. A second nut 12, which is pressed against the bottom side of the connecting grid 5, is threaded onto the bottom end of the second insert rod 9. To facilitate the replacement of damaged moving grid 4, the grid structure of this embodiment also includes a self-locking component for automatically locking the relative position of the docking block 27 in the docking groove 28 and an unlocking component for releasing the locking state of the docking block 27 in the docking groove 28. Specifically: The self-locking component includes a retaining bead 24 elastically disposed on the side wall of the docking groove 28, and a retaining hole 25 that mates with the retaining bead 24 is provided on the outer side wall of the docking block 27. A receiving groove 26 for receiving the retaining bead 24 is provided on the side wall of the docking groove 28, and a second spring is provided between the end of the retaining bead 24 away from the retaining hole 25 and the corresponding groove wall of the receiving groove 26.

[0033] In use, when the slider 11 is fully inserted into the docking block 27 through the docking groove 28, the locking bead 24 pops out and locks into the locking hole 25 under the action of the second spring, thus achieving self-locking.

[0034] Therefore, the self-locking component, by utilizing the cooperation of the locking ball 24 and the locking hole 25, can maintain the locked state under normal operating vibration to prevent the grid bars from loosening; combined with the spring buffer structure, it can effectively absorb the impact energy of large pieces of ore and protect the well ring foundation.

[0035] The unlocking components include an operating rod 15 concentrically rotatably inserted into the inner side of the second insert 9. The bottom end of the operating rod 15 extends to the outside of the bottom side of the second insert 9 (the bottom end is exposed for manual rotation). A transmission rod 18 is inserted into the top of the operating rod 15. A spiral groove 16 is axially formed on the inner side of the operating rod 15. A protrusion 17 that slides with the groove 16 is provided on the outer wall of the transmission rod 18. The top of the operating rod 15 extends into the inner side of the docking block 27 and is fixed to the inclined block 19. The side is connected to the corresponding side wall of the docking block 27 via the telescopic rod 20. The docking block 27 has a fixed upright plate 21. A top rod 22 parallel to the connecting grid 5 is slidably inserted on the upright plate 21. One end of the top rod 22 is pressed and engaged with the inclined block 19, and the other end is connected to the top plate 23. The top plate 23 can be extended into the locking hole 25 under the drive of the top rod 22 to press and engage with the locking bead 24. A third spring is sleeved on the outside of the top rod 22. The two ends of the third spring are respectively connected to the corresponding side wall of the top plate 23 and the corresponding side wall of the upright plate 21.

[0036] Thus, when the maintenance personnel rotate the operating rod 15 at the bottom of the screen, the operating rod 15 uses the axially spiral groove 16 wall to rub against and press the protrusion 17, forcing the transmission rod 18 to move axially and retract into the operating rod 15. This causes the inclined block 19 to press against the top rod 22, and the top rod 22 pushes the top plate 23 outward. The top plate 23 forcibly pushes the retaining ball 24 out of the retaining hole 25 (the second spring is compressed, causing the retaining ball 24 to retract into the receiving groove 26, and the third spring is stretched). At this time, the lock is released, and the maintenance personnel can pull out the moving grid bar 4 and the slider 11 for replacement or maintenance.

[0037] In one embodiment, the bottom of the fixed grid bar 3 is provided with a first insert rod 6 perpendicular to the top side of the connecting grid bar 5, and the connecting grid bar 5 is provided with a first insertion hole 7 for the first insert rod 6 to pass through. The bottom end of the first insert rod 6 is threaded with a first nut 8 that is pressed and engaged with the bottom side of the connecting grid bar 5.

[0038] During installation, the first insertion rod 6 is inserted through the first insertion hole 7, and the bottom end is pressed and fixed to the bottom side of the connecting grid bar 5 by the first nut 8, so as to ensure that the fixed grid bar 3 is in a stable position and serves as the reference skeleton of the grid screen.

[0039] Therefore, neither the fixed grid bar 3 nor the moving grid bar 4 is directly welded to the connecting grid bar 5, but is locked in place by a mechanical structure. When it is necessary to replace a severely worn grid bar, it can be quickly disassembled simply by operating the unlocking component, without the need for hot work or cutting, which greatly reduces maintenance difficulty and safety risks.

[0040] In one embodiment, the upper surface of the well ring foundation is provided with a drainage slope that slopes outward toward the chute, and a drainage trough is provided at the well ring foundation position corresponding to the junction of the inclined section 1 and the horizontal section 2, so as to quickly drain excess water that has fallen from the ore.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0042] It should be noted that if the embodiments of the invention involve directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Additionally, if the embodiments of the invention involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the invention.

Claims

1. An inlet-inclined anti-clogging chute screen structure, wherein the screen is installed at the wellhead of the chute, characterized in that, It includes multiple main grid bars and multiple connecting grid bars (5) that connect the main grid bars laterally; the top surface elevation of the main grid bars is higher than the top surface elevation of the connecting grid bars (5), so that the screen surface forms a unidirectional flow channel protruding only from the main grid bars; the main grid bars are divided into inclined sections (1) and horizontal sections (2) in sequence along the unloading direction, and the lower end of the inclined section (1) smoothly connects to the horizontal section (2); the main grid bars are divided into fixed grid bars (3) and moving grid bars (4) arranged at intervals, and each moving grid bar (4) is located in the middle of every two adjacent fixed grid bars (3); it also includes an adjustment component, which is triggered by the ore rolling down and hitting the screen surface to drive the moving grid bars (4) to move relative to each other between two adjacent fixed grid bars (3) along the length direction of the connecting grid bars (5), so as to adjust the net distance between the openings of adjacent main grid bars.

2. The inlet-inclined anti-clogging chute screen structure as described in claim 1, characterized in that, The adjustable distance assembly includes a slider (11) disposed on the top side of the connecting grid (5). The bottom of the moving grid (4) is provided with a groove (13) that cooperates with the slider (11). The groove (13) extends in a direction parallel to the length direction of the connecting grid (5). A sliding rod (14) is disposed in the groove (13). The slider (11) is slidably sleeved on the outside of the sliding rod (14). A first spring is sleeved on the outside of both ends of the sliding rod (14). The two ends of each first spring are respectively connected to the corresponding outer wall of the slider (11) and the corresponding groove wall of the groove (13).

3. The inlet-inclined anti-clogging chute screen structure as described in claim 2, characterized in that, The slider (11) has a docking groove (28) on its bottom side, and the connecting grid (5) has a docking block (27) on its top side that is inserted into the docking groove (28). The docking block (27) has a second insert rod (9) perpendicular to the top side of the connecting grid (5). The connecting grid (5) has a second insertion hole (10) through which the second insert rod (9) passes. The bottom end of the second insert rod (9) is threaded with a second nut (12) that is pressed into the bottom side of the connecting grid (5). The device also includes a self-locking component for automatically locking the relative position of the docking block (27) in the docking groove (28) and an unlocking component for releasing the locking state of the self-locking component docking block (27) in the docking groove (28).

4. The inlet-inclined anti-clogging chute screen structure as described in claim 3, characterized in that, The self-locking assembly includes a locking bead (24) elastically disposed on the side wall of the docking groove (28), and a locking hole (25) that mates with the locking bead (24) is provided on the outer side wall of the docking block (27).

5. The inlet-inclined anti-clogging chute screen structure as described in claim 4, characterized in that, The docking groove (28) has a receiving groove (26) on its side wall for receiving the locking bead (24). A second spring is provided between the end of the locking bead (24) away from the locking hole (25) and the corresponding groove wall of the receiving groove (26).

6. The inlet-inclined anti-clogging chute screen structure as described in claim 4, characterized in that, The unlocking assembly includes an operating rod (15) concentrically rotatably inserted into the inner side of the second insert rod (9). The bottom end of the operating rod (15) extends to the outside of the bottom side of the second insert rod (9). A transmission rod (18) is inserted into the top end of the operating rod (15). A spiral groove (16) is axially formed on the inner side of the operating rod (15). A protrusion (17) is provided on the outer wall of the transmission rod (18) to slide with the groove (16). The top end of the operating rod (15) extends into the inner side of the docking block (27) and is fixed to the inclined block (19). The top side of the inclined block (19) is connected by a telescopic rod (20). The top plate (21) is fixed inside the docking block (27) and is connected to the corresponding side wall of the docking block (27). A top rod (22) parallel to the connecting grid (5) is slidably inserted on the top plate (21). One end of the top rod (22) is pressed and engaged with the inclined block (19), and the other end is connected to the top plate (23). The top plate (23) can be extended into the card hole (25) under the drive of the top rod (22) to press and engage with the card ball (24). A third spring is sleeved on the outside of the top rod (22). The two ends of the third spring are respectively connected to the corresponding side wall of the top plate (23) and the corresponding side wall of the top plate (21).

7. The inlet-inclined anti-clogging chute screen structure as described in claim 1, characterized in that, The bottom of the fixed grid bar (3) is provided with a first insert rod (6) perpendicular to the top side of the connecting grid bar (5). The connecting grid bar (5) is provided with a first insertion hole (7) through which the first insert rod (6) passes. The bottom end of the first insert rod (6) is threaded with a first nut (8) that is pressed and fitted with the bottom side of the connecting grid bar (5).

8. The inlet-inclined anti-clogging chute screen structure as described in claim 1, characterized in that, The cross-section of the main grid bar is an inverted trapezoidal or T-shaped structure, so that the unidirectional flow channel formed between adjacent main grid bars has an enlarged hole shape with a smaller top and a larger bottom in the vertical cross-section.

9. The inlet-inclined anti-clogging chute screen structure as described in claim 1, characterized in that, Define the standard aperture clearance between two adjacent main grid bars as d. Then, the actual aperture clearance between adjacent main grid bars varies randomly or alternately within the range of d ± a, where a is 5%-15% of the standard aperture clearance d.

10. The inlet-inclined anti-clogging chute screen structure as described in claim 1, characterized in that, The high end of the inclined section (1) is located at the vehicle stopper, and the horizontal section (2) is located at the well ring foundation of the chute at one end away from the inclined section (1). An elastic buffer pad is provided between the screen and the well ring foundation.

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