On-site screening device for bulk materials in dumping site
Through innovative design of the stabilization and screening mechanisms, the problem of slippage and relocation difficulties of the spoil heap equipment on slopes has been solved, achieving stability and efficient screening of the equipment on complex terrain, and reducing equipment weight and maintenance costs.
Patent Information
- Application Number
- CN202610456446.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-08
- Publication Date
- 2026-05-15
AI Technical Summary
Existing soil screening equipment at spoil heaps is at risk of slippage in complex terrain, especially on slopes, and existing anti-slip technologies have safety hazards, are difficult to relocate, or are costly.
The stabilizing mechanism, including a base, adjusting plate, and stabilizing plate, is inserted into the slope through a sharp conical indentation. The height is adjusted by the adjusting plate and screw, and with the help of elastic expansion plates and fixing pins, it provides deep fixation and surface grip, enhancing friction. The screening mechanism is designed with a support frame, hydraulic rods, and grid-type screen cylinder to adapt to different slopes and terrains.
It effectively suppresses equipment slippage, improves screening efficiency and stability, reduces the total weight of the equipment, simplifies the relocation process, reduces maintenance costs, and adapts to frequent relocation operations at spoil heaps.
Smart Images
Figure CN122032846A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of screening equipment technology, specifically relating to an on-site screening device for bulk materials in spoil heaps that is simple in structure, easy to adjust, stable and reliable, and highly adaptable. Background Technology
[0002] A waste dump (also known as a spoil heap or waste rock dump) is a site where mining waste is centrally disposed of. Since the waste soil (rock) in a waste dump often contains usable minerals, soil, or aggregates, screening can separate valuable components through particle size classification, reducing resource waste. Currently, the commonly used screening devices for waste dumps are vibrating screens and drum screens. Due to the complex and varied terrain of waste dumps, it is difficult to ensure a flat surface during screening. Screening on slopes is inconvenient, especially for vibrating screens, which tend to slide down slopes due to vibration. Therefore, drum screens are commonly used on complex terrain. However, drum screens are heavy (including motors and drums) and subject to vibration loads during operation. Furthermore, slopes are susceptible to erosion from rainwater and soil softening, posing a risk of slippage and seriously threatening equipment safety and operational efficiency.
[0003] In existing technologies, to enhance the friction of operating equipment, counteract sliding forces, or actively control movement, and to ensure the safety and efficiency of equipment operation on slopes, common anti-slip technologies include mechanical fixing, self-weight balancing, and slope reinforcement. Mechanical fixing anti-slip technology, for example, connects the equipment to a deep, stable structure on the slope (such as bedrock or anti-slip piles) or a slope anchor through physical connectors, directly restricting the equipment's displacement along the slope. This is currently the most widely used basic anti-slip solution, mainly including three forms: anchor bolt fixing (such as the patent with announcement number CN202420424845), anti-slip pile-equipment connection, and steel cable traction. Although it has strong anti-slip force, simple structure, and low cost, it is prone to pull-out in loose soil (such as sandy soil layers), and subsequent equipment relocation is difficult. Furthermore, anchor bolts and steel cables are prone to fatigue fracture under vibration loads, posing significant safety hazards. Self-weight balancing anti-slip technology optimizes the equipment's structural design by increasing the weight of the anti-slip end and adjusting the center of gravity. This ensures that the anti-slip component of the equipment's weight along the slope is greater than the sliding component, eliminating the need for external fixation. The core principle is "anti-slip using the equipment's own weight," and it mainly includes two design schemes: counterweight balancing and shifting the center of gravity backward. Although the structure is simple, reusable, easy to relocate, and requires no additional construction, the total weight of the equipment is relatively large, which places high demands on the slope's bearing capacity. Its application presents numerous problems when the slope angle exceeds 20°, and complex readjustments are required after relocation. Therefore, its application in waste dump screening is relatively limited. Slope reinforcement anti-slip technology enhances the adhesion between the equipment and the slope by improving the physical properties of the slope surface below the equipment (such as increasing the coefficient of friction and improving the bearing capacity), thereby reducing the risk of slippage from the "basic level". Essentially, it "optimizes the support environment of the equipment" and mainly includes three solutions: anti-slip pad laying, slope solidification, and drainage optimization. Although it has a wide range of applications, is not limited by equipment type or slope, and has good durability, it has the problem that soft slopes need to be leveled first and the cost is relatively high. It is not suitable for spoil heaps that require frequent movement of soil screening equipment. Summary of the Invention
[0004] To address the problems mentioned in the background section, this invention provides a simple, easy-to-adjust, stable, reliable, and highly adaptable on-site screening device for bulk materials in spoil heaps.
[0005] The on-site screening device for bulk materials at the spoil heap of the present invention is implemented as follows: it includes a stabilizing mechanism and a screening mechanism, wherein the stabilizing mechanism is disposed below the screening mechanism; The stabilizing mechanism includes a base and an adjusting plate. The base extends along the axis of the screening mechanism and has multiple stabilizing plates that are vertically slidably arranged at intervals. The bottom of each stabilizing plate has a sharp conical indentation. The adjusting plate is located below the base. The upper surface of the adjusting plate has multiple screws that are vertically spaced. The screws slide through the base and are connected to the base through nuts. The stabilizing plate slides through the adjusting plate and extends downward. The upper surface of the base has support columns and hydraulic rods at both ends along the axis of the screening mechanism. The screening mechanism includes a support frame and a screen cylinder. The two ends of the support frame along its length are respectively hinged to a support column and a hydraulic rod. A motor is fixedly installed at one end of the support frame. Transmission rods are symmetrically arranged on both sides of the support frame, and at least one side of the support frame is connected to the output end of the motor. Transmission wheels are fixedly installed at at least two ends of the transmission rods. The screen cylinder is rotatably mounted on the transmission wheels of the transmission rods on both sides. A hopper communicating with the feed inlet of the screen cylinder is provided at one end of the support frame. An adjusting column is provided on one side of the screen cylinder. Multiple adjusting rods are spaced apart on the adjusting column along the axial direction of the screen cylinder. A gear that meshes with the wall of the screen cylinder hole is rotatably installed at the end of the adjusting rod extending towards the screen cylinder and close to the screen cylinder.
[0006] Furthermore, the base includes symmetrically arranged support plates, with at least two sliding holes spaced apart along the length direction on the support plates. The screw slides through the sliding holes and is connected to a nut at least at the lower end of the sliding holes. The bottom of the adjusting plate is provided with a number of barbs with their tips away from the hopper. Multiple partitions are spaced apart between the support plates, and limit grooves are provided on the partitions. The stabilizing plate slides through the limit grooves.
[0007] The limiting groove is an inwardly concave arc-shaped structure on the side away from the hopper and has circular holes at both ends. The stabilizing plate is an arc-shaped plate that is adapted to the limiting groove and slides through the limiting groove. The stabilizing plate has stabilizing pins on both sides that are adapted to the circular holes of the limiting groove, and the bottom of the stabilizing pin is provided with a cone.
[0008] Furthermore, the stabilizing pin is a hollow tube with the bottom end of the stabilizing plate extending outwards. Multiple elastic expansion plates are evenly distributed around the lower part of the stabilizing pin. The upper inner sides of the multiple expansion plates are combined to form a conical positioning hole. A conical positioning block is provided at the bottom end of the multiple expansion plates. A fixing pin with its bottom engaging with the conical positioning hole is slidably disposed inside the stabilizing pin.
[0009] Furthermore, the top of the stabilizing plate is provided with a stop block whose outer contour is larger than that of the limiting groove, the top of the fixing pin is provided with a pin head whose diameter is larger than that of the hollow tube of the stabilizing pin, and the length of the fixing pin is greater than the depth of the hollow tube of the stabilizing pin.
[0010] Furthermore, the support column is fixedly installed on the upper surface of the support plate near the hopper and its top end is hinged to the support frame. The hydraulic rod is hinged on the upper surface of the support plate away from the hopper and its top end is hinged to the support frame. The support frame has a soil discharge trough below the screen cylinder, and a discharge port extending to the outside of the support plate is inclined on one side of the soil discharge trough.
[0011] Furthermore, the soil discharge trough is provided with upwardly extending baffles on both sides of the screen cylinder. The adjusting column is located on the outside of the baffle and its bottom is fixedly connected to the support frame, while its top is higher than the baffle on the same side. One end of the adjusting rod is threadedly connected to the top of the adjusting column, and the other end extends into the screen cylinder.
[0012] Furthermore, a pair of supports are vertically fixed on the upper surface of the support frame, and the two ends of the transmission rod are rotatably connected to the corresponding supports.
[0013] Furthermore, the screen cylinder is a grid-type drum, and the circumferential spacing of the grid in the screen cylinder is adapted to the tooth pitch of the gear.
[0014] Furthermore, a mounting base is vertically fixed on the upper surface of the support plate near the hopper, the mounting base has a blind hole with an open top, the lower part of the support column is slidably disposed in the blind hole of the mounting base, and a hinge seat is fixed on the upper surface of the support plate away from the hopper, the lower end of the hydraulic rod is hinged to the hinge seat.
[0015] The present invention has the following beneficial effects: 1. This invention utilizes the sharp conical insertion surface at the bottom of the stabilizing plate to directly insert into the slope, combined with the barbs at the bottom of the adjusting plate, forming a dual anti-slip structure of "deep fixation + surface gripping." Simultaneously, the adjusting plate's height is adjustable via screws and nuts to adapt to different slopes or ground undulations, ensuring close contact between the stabilizing plate and the slope. Furthermore, the elastic expansion plate at the bottom of the stabilizing pin expands outwards after insertion into the slope, increasing friction and contact area. Combined with the locking mechanism of the fixing pin and the conical positioning hole, this prevents the stabilizing plate from detaching under vibration loads. Through these multiple innovative designs, equipment slippage is effectively suppressed, thereby enhancing the stability of the invention for slope operations. 2. The support frame of this invention is connected to the base at both ends via support columns (fixed hinges) and hydraulic rods (telescopic hinges). The extension and retraction of the hydraulic rods can adjust the tilt angle of the support frame, thereby adapting to screening operations with different slopes and materials, and keeping the screen cylinder horizontal or at the optimal working angle, effectively ensuring screening efficiency. Furthermore, the adjusting rod on one side of the screen cylinder meshes with the screen cylinder hole wall via gears. This not only pushes out stones and other debris stuck in the gaps between the screen cylinder holes to avoid blockage, but also precisely adjusts the tension of the screen cylinder to prevent it from shifting, thereby improving screening efficiency and stability.
[0016] 3. This invention provides anti-slip force through the active anchoring of the stabilizing mechanism (stabilizing plate insertion + expansion plate locking), eliminating the need for additional counterweights and reducing the total weight of the equipment, thus lowering the requirements for the bearing capacity of the slope. At the same time, the modular design of the stabilizing mechanism (the screw slides through the base and is connected by a nut, the stabilizing plate slides through the limiting groove, and the fixing pin slides into the stabilizing pin) facilitates disassembly and relocation, solving the problem of difficult relocation of existing fixing technologies. Therefore, it is suitable for operation scenarios where spoil heaps are frequently moved.
[0017] 4. The screen cylinder of this invention adopts a grid design that is compatible with the gear pitch. The transmission rod drives the screen cylinder to roll through the transmission wheel, making the overall structure simple, the transmission stable, and reducing jamming or clogging. The soil discharge trough and discharge port set on the support frame facilitate the rapid discharge of screened materials to improve work efficiency, and also avoid the contamination of the stabilizing mechanism by bulk materials, thereby improving the reliability of moving parts. Moreover, the expansion plates and fixing pins of the stabilizing pins adopt an elastic / adjustable component design, which can reduce the risk of fatigue fracture under vibration load (compared to the easy breakage problem of anchor bolts / steel cables in mechanical fixing), effectively extending the service life of the equipment and reducing maintenance costs.
[0018] In summary, this invention, through its stabilizing mechanism employing "deep fixation + surface gripping," and its screening mechanism featuring efficient screening and lightweight design, effectively solves problems such as slippage, difficulty in adjustment, and inconvenience in relocation of screening equipment in complex terrain. It combines stability, adaptability, and economy, and is suitable for on-site screening of bulk materials in various scenarios such as spoil heaps. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 The front view; Figure 3 This is a schematic diagram of the stabilizing mechanism structure of the present invention; Figure 4 This is a schematic diagram of the screening mechanism of the present invention; Figure 5 This is a schematic diagram of the stabilizing plate structure of the present invention; Figure 6 This is a cross-sectional view of the stabilizing plate of the present invention; In the diagram: 1-stabilizing mechanism, 11-base, 111-support plate, 112-sliding hole, 113-partition, 114-limiting groove, 12-stabilizing plate, 121-stabilizing pin, 1211-expansion plate, 1212-conical positioning hole, 1213-conical positioning block, 13-fixing pin, 14-adjusting plate, 141-barb, 15-screw, 16-nut, 17-support column, 18-hydraulic rod, 19-mounting seat, 1A-hinged seat, 2-screening mechanism, 21-support frame, 211-soil discharge trough, 212-discharge port, 213-baffle, 22-motor, 23-transmission rod, 24-transmission wheel, 25-screen cylinder, 26-hopper, 27-adjusting column, 28-adjusting rod, 29-gear, 2A-support. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.
[0021] like Figures 1 to 6 As shown, the on-site screening device for bulk materials in the spoil heap of the present invention includes a stabilizing mechanism 1 and a screening mechanism 2, wherein the stabilizing mechanism 1 is disposed below the screening mechanism 2; The stabilizing mechanism 1 includes a base 11 and an adjusting plate 14. The base 11 extends along the axis of the screening mechanism 2 and is vertically and slidably provided with multiple stabilizing plates 12 at intervals. The bottom of the stabilizing plate 12 is provided with a sharp conical indentation surface. The adjusting plate 14 is located below the base 11. The upper surface of the adjusting plate 14 is vertically and spaced apart with multiple screws 15. The screws 15 slide through the base 11 and are connected to the base 11 through nuts 16. The stabilizing plates 12 slide through the adjusting plate 14 and extend downward. The upper surface of the base 11 is provided with support columns 17 and hydraulic rods 18 at both ends in the axial direction of the screening mechanism 2. The screening mechanism 2 includes a support frame 21 and a screen cylinder 25. The two ends of the support frame 21 along its length are respectively hinged to a support column 17 and a hydraulic rod 18. A motor 22 is fixedly installed at one end of the support frame 21. Transmission rods 23 are symmetrically arranged on both sides of the support frame 21, and at least one side of the support frame 21 is connected to the output end of the motor 22. Transmission wheels 24 are fixedly installed at at least two ends of the transmission rods 23. The screen cylinder 25 is rolled on the transmission wheels 24 of the transmission rods 23 on both sides. A hopper 26 communicating with the feed inlet of the screen cylinder 25 is provided at one end of the support frame 21. An adjusting column 27 is provided on one side of the screen cylinder 25. Multiple adjusting rods 28 are spaced apart on the adjusting column 27 along the axial direction of the screen cylinder 25. A gear 29 that meshes with the hole wall of the screen cylinder 25 is rotatably provided at the end of the adjusting rod 28 extending towards the screen cylinder 25 and close to the screen cylinder 25.
[0022] like Figures 1 to 3 As shown, the base 11 includes symmetrically arranged support plates 111. At least two sliding holes 112 are spaced apart along the length direction on the support plates 111. The screw 15 slides through the sliding holes 112 and is connected to a nut 16 at least at the lower end of the sliding holes 112. The bottom of the adjusting plate 14 is provided with a plurality of barbs 141 with their tips away from the hopper 26. A plurality of partitions 113 are spaced apart between the support plates 111. Limiting grooves 114 are provided on the partitions 113. The stabilizing plate 12 slides through the limiting grooves 114. The weight of the screening mechanism 2 is distributed by the symmetrically arranged support plates 111, which makes the base 11 more stable on the slope; at the same time, the partition plate 113 and the support plate 111 form an I-shaped structure, which makes the base 11 more stable when facing lateral loads; and through the cooperation of the screw 15 and the nut 16, the height difference between the adjusting plate 14 and the base 11 can be adjusted, and the adjusting plates 14 on both sides can be adjusted separately, so that the base 11 can stably fit when facing slopes of different heights on both sides.
[0023] The limiting groove 114 is an inwardly recessed arc-shaped structure on the side away from the hopper 26, with circular holes at both ends. The stabilizing plate 12 is an arc-shaped plate adapted to the limiting groove 114 and slides through it. Stabilizing pins 121 adapted to the circular holes of the limiting groove 114 are provided on both sides of the stabilizing plate 12. The bottom of each stabilizing pin 121 has a cone shape. The arc-shaped stabilizing plate 12 can enclose the soil within its groove, giving it stronger resistance against the base 11 sliding down. The sharp conical entry surface at the bottom of the stabilizing plate 12 helps it insert more easily into the ground.
[0024] The stabilizing pin 121 is a hollow tube extending from the bottom of the stabilizing plate 12. Multiple elastic expansion tabs 1211 are evenly distributed circumferentially on the lower part of the stabilizing pin 121. The upper inner sides of the multiple expansion tabs 1211 combine to form a conical positioning hole 1212. A conical positioning block 1213 is provided at the bottom of the multiple expansion tabs 1211. A fixing pin 13, whose bottom mates with the conical positioning hole 1212, is slidably disposed inside the stabilizing pin 121. By inserting the fixing pin 13 into the stabilizing pin 121, the fixing pin 13 pushes the expansion tabs 1211 open, thereby causing the conical positioning block 1213 at the bottom of the stabilizing pin 121 to expand, thus making the stabilizing plate 12 more stable on the ground.
[0025] The top of the stabilizing plate 12 is provided with a stop block whose outer contour is larger than that of the limiting groove 114, the top of the fixing pin 13 is provided with a pin head whose diameter is larger than that of the hollow tube of the stabilizing pin 121, and the length of the fixing pin 13 is greater than the depth of the hollow tube of the stabilizing pin 121.
[0026] like Figures 1 to 4 As shown, the support column 17 is fixedly installed on the upper surface of the support plate 111 on the side near the hopper 26 and its top end is hinged to the support frame 21. The hydraulic rod 18 is hinged on the upper surface of the support plate 111 on the side away from the hopper 26 and its top end is hinged to the support frame 21. The support frame 21 has a soil discharge trough 211 below the screen cylinder 25. One side of the soil discharge trough 211 is inclined to have a discharge port 212 extending to the outside of the support plate 111.
[0027] The soil discharge trough 211 has upwardly extending baffles 213 on both sides of the screen cylinder 25. The adjusting column 27 is located outside the baffles 213, with its bottom fixedly connected to the support frame 21 and its top higher than the baffles 213 on the same side. One end of the adjusting rod 28 is threadedly connected to the top of the adjusting column 27, and the other end extends towards the screen cylinder 25. The inclined discharge port 212 prevents the screened soil from adversely affecting the base 11, hydraulic rod 18, etc., while the baffles 213 also prevent soil from falling and interfering with the motor 22 and other devices.
[0028] The upper surface of the support frame 21 is vertically fixed with a pair of supports 2A, and the two ends of the transmission rod 23 are rotatably connected to the corresponding supports 2A.
[0029] The screen cylinder 25 is a grid-type drum, and the circumferential spacing of the grid in the screen cylinder 25 is adapted to the tooth pitch of the gear 29.
[0030] like Figures 1 to 3 As shown, a mounting base 19 is vertically fixed on the upper surface of the support plate 111 near the hopper 26. The mounting base 19 has a blind hole with an open top. The lower part of the support column 17 is slidably disposed in the blind hole of the mounting base 19. A hinge seat 1A is fixed on the upper surface of the support plate 111 away from the hopper 26. The lower end of the hydraulic rod 18 is hinged to the hinge seat 1A.
[0031] The working principle and process of this invention: like Figures 1 to 6As shown, before sieving soil on the slope of the spoil heap, the base 11 is first placed on the slope. Then, according to the slope conditions, the height between the base 11 and the adjusting plate 14 is adjusted by the screw 15 and nut 16 to ensure that the base 11 is stably placed on the slope. Next, the stabilizing plate 12 is inserted into the limiting groove 114, and the lower parts of the stabilizing plate 12 and the stabilizing pin 121 are deeply embedded in the ground. Then, the fixing pin 13 is inserted into the stabilizing pin 121. As the fixing pin 13 is inserted, it pushes the expansion plate 1211 to expand outwards through the conical positioning hole 1212. This causes the conical positioning block 1213 at the bottom of the stabilizing pin 121 to expand, thus firmly fixing it to the ground. Next, the support frame 21 is fixedly hinged to the top of the support column 17 and the hydraulic rod 18. Finally, the screen cylinder 25 is installed on the transmission wheel 24 of the transmission rod 23, and according to the slope, the rear end of the support frame 21 is raised by manipulating the hydraulic rod 18, thereby changing the inclination of the screen cylinder 25 and thus changing the center of gravity of the screening mechanism 2. This adjustment of the center of gravity makes the base 11 more stable when bearing the weight of the screen cylinder 25, thus completing the assembly and adjustment of the invention. Then, the motor 22 can be started to rotate the screen cylinder 25 and shovel waste soil (rock) from the dump into the hopper 26 for continuous screening.
[0032] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A field screening device for bulk materials at a spoil heap, characterized in that: It includes a stabilizing mechanism (1) and a screening mechanism (2), wherein the stabilizing mechanism (1) is disposed below the screening mechanism (2); The stabilizing mechanism (1) includes a base (11) and an adjusting plate (14). The base (11) extends along the axis of the screening mechanism (2) and is provided with multiple stabilizing plates (12) at intervals. The bottom of the stabilizing plate (12) is provided with a sharp conical surface. The adjusting plate (14) is located below the base (11). Multiple screws (15) are provided vertically at intervals on the upper surface of the adjusting plate (14). The screws (15) slide through the base (11) and are connected to the base (11) through nuts (16). The stabilizing plate (12) slides through the adjusting plate (14) and extends downward. The upper surface of the base (11) is provided with support columns (17) and hydraulic rods (18) at both ends of the axial direction of the screening mechanism (2). The screening mechanism (2) includes a support frame (21) and a screen cylinder (25). The two ends of the support frame (21) along its length are respectively hinged to a support column (17) and a hydraulic rod (18). A motor (22) is fixedly installed at one end of the support frame (21). Transmission rods (23) are symmetrically arranged on both sides of the support frame (21), and at least one side of the support frame (21) is connected to the output end of the motor (22). Transmission wheels (24) are fixedly installed at at least two ends of the transmission rods (23). The screen cylinder (25) is rolled. On the transmission wheel (24) of the transmission rod (23) on both sides, a hopper (26) communicating with the feed inlet of the screen cylinder (25) is provided at one end of the support frame (21). An adjusting column (27) is provided on one side of the screen cylinder (25) on the support frame (21). Multiple adjusting rods (28) are provided at intervals along the axial direction of the screen cylinder (25) on the adjusting column (27). A gear (29) that meshes with the hole wall of the screen cylinder (25) is rotatably provided at the end of the adjusting rod (28) that extends toward the screen cylinder (25) and is close to the screen cylinder (25).
2. The on-site screening device for bulk materials at the spoil heap according to claim 1, characterized in that: The base (11) includes symmetrically arranged support plates (111). At least two sliding holes (112) are spaced apart along the length direction on the support plates (111). The screw (15) slides through the sliding holes (112) and is connected to a nut (16) at least at the lower end of the sliding holes (112). The bottom of the adjusting plate (14) is provided with a number of barbs (141) with their tips away from the hopper (26). A number of partitions (113) are spaced apart between the support plates (111). Limiting grooves (114) are provided on the partitions (113). The stabilizing plate (12) slides through the limiting grooves (114).
3. The on-site screening device for bulk materials at the spoil heap according to claim 2, characterized in that: The limiting groove (114) is an inwardly concave arc-shaped structure on the side away from the hopper (26) and has circular holes at both ends. The stabilizing plate (12) is an arc-shaped plate that is adapted to the limiting groove (114) and slides through the limiting groove (114). The stabilizing pins (121) that are adapted to the circular holes of the limiting groove (114) are provided on both sides of the stabilizing plate (12). The bottom of the stabilizing pin (121) is provided with a cone.
4. The on-site screening device for bulk materials at the spoil heap according to claim 3, characterized in that: The stabilizing pin (121) is a hollow tube with the bottom end of the stabilizing plate (12) extending outwards. The lower part of the stabilizing pin (121) is evenly distributed with multiple elastic expansion pieces (1211). The upper inner sides of the multiple expansion pieces (1211) are combined to form a conical positioning hole (1212). The bottom end of the multiple expansion pieces (1211) is provided with a conical positioning block (1213). A fixing pin (13) with its bottom engaging with the conical positioning hole (1212) is slidably disposed inside the stabilizing pin (121).
5. The on-site screening device for bulk materials at the spoil heap according to claim 4, characterized in that: The top of the stabilizing plate (12) is provided with a stop block whose outer contour is larger than that of the limiting groove (114), the top of the fixing pin (13) is provided with a pin head whose diameter is larger than that of the hollow tube of the stabilizing pin (121), and the length of the fixing pin (13) is greater than the depth of the hollow tube of the stabilizing pin (121).
6. The on-site screening device for bulk materials at spoil heaps according to claim 2, 3, 4 or 5, characterized in that: The support column (17) is fixedly installed on the upper surface of the support plate (111) near the hopper (26) and its top end is hinged to the support frame (21). The hydraulic rod (18) is hinged on the upper surface of the support plate (111) away from the hopper (26) and its top end is hinged to the support frame (21). The support frame (21) has a soil discharge trough (211) below the screen cylinder (25). The soil discharge trough (211) has an inclined outlet (212) extending to the outside of the support plate (111) on one side.
7. The on-site screening device for bulk materials at spoil heaps according to claim 6, characterized in that: The soil discharge trough (211) has upward-extending baffles (213) on both sides of the screen cylinder (25). The adjusting column (27) is located on the outside of the baffle (213) and its bottom is fixedly connected to the support frame (21), and its top is higher than the baffle (213) on the same side. One end of the adjusting rod (28) is threadedly connected to the top of the adjusting column (27), and the other end extends toward the screen cylinder (25).
8. The on-site screening device for bulk materials at the spoil heap according to claim 6, characterized in that: The upper surface of the support frame (21) is vertically fixed with a pair of supports (2A), and the two ends of the transmission rod (23) are rotatably connected to the corresponding supports (2A).
9. The on-site screening device for bulk materials at spoil heaps according to claim 6, characterized in that: The screen cylinder (25) is a grid-type drum, and the circumferential spacing of the grid of the screen cylinder (25) is adapted to the tooth pitch of the gear (29).
10. The on-site screening device for bulk materials at the spoil heap according to claim 6, characterized in that: A mounting base (19) is vertically fixed on the upper surface of the support plate (111) near the hopper (26). The mounting base (19) has a blind hole with an open top. The lower part of the support column (17) is slidably disposed in the blind hole of the mounting base (19). A hinge seat (1A) is fixed on the upper surface of the support plate (111) away from the hopper (26). The lower end of the hydraulic rod (18) is hinged to the hinge seat (1A).