A screen plate replacement device for a coal preparation machine vibrating screen

Abstract

The utility model relates to coal preparation machine maintenance technical field especially relates to a screen plate replacement device for coal preparation machine vibrating screen, include: crossbeam, support, drive structure and adjusting structure, the screw rod is rotatively connected in the crossbeam inside, the connecting beam is slidably connected in the inside symmetry of crossbeam both ends, two connecting beams are respectively with the screw rod both ends screw connection, two connecting beams are fixedly connected with the support at the end away from each other, the utility model discloses a combination structure of'fixed base + lever handle + alloy steel draw hook'replaces artificial direct force with lever principle: when using, only need to open 20mm*20mm process hole in the edge of the screen plate to be replaced, embed the draw hook in the hole and hook the screen plate framework, press down the handle (force <=50N) can quickly lift the screen plate, the replacement time of single screen plate <=3 minutes, the efficiency is improved 90% compared with traditional method, effectively reduces the maintenance time length when vibrating screen stops, guarantees the smoothness of coal production process.

Description

Technical Field

[0001] This utility model relates to the field of coal preparation machine maintenance technology, and in particular to a screen plate replacement device for a coal preparation machine vibrating screen. Background Technology

[0002] Coal preparation plants are a crucial link in coal processing, and one of their core pieces of equipment is the vibrating screen. This equipment is mainly used for coal grading and screening, separating raw coal based on its particle size, density, or shape to meet the needs of different users. With the continuous development of the coal industry, higher performance requirements have been placed on vibrating screens, especially in terms of screen plate replacement efficiency and operational safety. Existing technologies are gradually becoming inadequate for actual production needs.

[0003] In actual production in the coal preparation industry, screen plate replacement of vibrating screens is a frequent maintenance operation. Currently, the screen plates used in grading vibrating screens in coal preparation plants are mostly perforated stainless steel or polyurethane screen plates, and they are generally fixed by an inlay method. While this method ensures a flat screen surface, it makes screen plate disassembly extremely inconvenient. Existing screen plate replacement operations mainly rely on two traditional methods: one is to use a hammer to drive a screwdriver into the edge of the screen plate to pry it up; the other is to thread a steel wire rope through the screen holes and then use a steel pipe to lift the screen plate. Both methods are not only time-consuming and labor-intensive, but also pose significant safety hazards.

[0004] Therefore, it is necessary to provide a new screen plate replacement device for a coal preparation machine vibrating screen to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a screen plate replacement device for a coal preparation machine vibrating screen.

[0006] The screen plate replacement device for a coal preparation machine vibrating screen provided by this utility model includes: a crossbeam, a support, a drive structure, and an adjustment structure. A threaded rod is rotatably connected inside the crossbeam, and connecting beams are symmetrically slidably connected inside both ends of the crossbeam. The two connecting beams are respectively threaded to both ends of the threaded rod. A support is fixedly connected to the ends of the two connecting beams that are far apart from each other. Support rods are symmetrically fixedly connected to the top of the crossbeam. A sleeve is rotatably connected between the two support rods. A lever is installed inside the sleeve. A hook is rotatably connected to one end of the resistance arm of the lever. A drive structure for adjusting the distance between the two supports is provided inside the crossbeam, and an adjustment structure is installed between the sleeve and the lever.

[0007] Preferably, the drive structure includes: a worm gear and a worm, with the worm gear fixedly connected to the middle of the threaded rod, the worm rotatably connected to the middle of the crossbeam, the worm meshing with the worm gear, one end of the worm extending out of the crossbeam and fixedly connected to a connecting disc, and a crank fixedly connected to one side of the connecting disc away from the center.

[0008] Preferably, the adjusting structure includes: an arc-shaped locking block and a locking groove, a connecting seat fixedly connected to the middle of the sleeve, a groove opened inside the connecting seat, a sliding plate slidably connected to the inner wall of the groove, a spring fixedly connected between the inner wall of the groove and the sliding plate, a square rod fixedly connected to the middle of the sliding plate, one end of the square rod extending out of the sliding plate and fixedly connected to the arc-shaped locking block, and a locking groove opened at equal intervals at one end of the lever, with the arc-shaped locking block engaging with the locking groove.

[0009] Preferably, one end of the square rod extends out of the connecting seat and is fixedly connected to a pull ring.

[0010] Preferably, both brackets and both support rods are hollow inside.

[0011] Preferably, the threaded rod is a bidirectional threaded rod, and both ends of the threaded rod are fixedly connected to limit plates.

[0012] Compared with related technologies, the screen plate replacement device for the vibrating screen of the coal preparation machine provided by this utility model has the following beneficial effects: Traditional screen plate replacement relies on manual prying, with each plate replacement taking ≥30 minutes, severely impacting vibrating screen maintenance time and disrupting coal preparation plant production continuity. This device utilizes a combination of a fixed base, lever handle, and alloy steel hook to replace direct manual force with a lever principle: During use, simply drill a 20mm×20mm process hole on the edge of the screen plate to be replaced, insert the hook into the hole to engage the screen plate frame, and press down the handle (force ≤50N) to quickly lift the screen plate. The replacement time for a single screen plate is ≤3 minutes, increasing efficiency by 90% compared to traditional methods. This effectively reduces vibrating screen downtime for maintenance, ensuring smooth coal preparation production processes.

[0013] Traditional forceful disassembly (hammering, prying) easily results in direct impact to the screen surface and prying of the screen body, leading to a screen body deformation rate as high as 15%, increasing the maintenance cost and replacement frequency of the vibrating screen equipment. This device protects the equipment through precise structural design: the alloy steel hook uses a 5mm radius arc hook head, which can accurately hook onto the central skeleton of the screen plate, rather than directly acting on the screen surface or the edge of the screen body; at the same time, the smooth force application of the lever transmission avoids excessive local force, effectively reducing the possibility of screen plate deformation and screen body damage, reducing the screen body damage rate from the traditional 15% to 1%, significantly reducing equipment wear and extending the overall service life of the vibrating screen. Attached Figure Description

[0014] Figure 1 A schematic diagram of the screen plate replacement device for a coal preparation machine vibrating screen provided by this utility model; Figure 2 for Figure 1 The diagram shows a side sectional view of the beam. Figure 3 for Figure 1 The diagram shown is a structural schematic of a worm gear. Figure 4 for Figure 2 The diagram shown is an enlarged side view sectional view of the connector.

[0015] The following are the labels in the diagram: 1. Crossbeam; 2. Threaded rod; 3. Connecting beam; 4. Bracket; 5. Support rod; 6. Sleeve; 7. Lever; 8. Worm gear; 9. Worm; 10. Connecting plate; 11. Handle; 12. Connecting seat; 13. Groove; 14. Slide plate; 15. Spring; 16. Square rod; 17. Locking block; 18. Locking groove; 19. Pull ring; 20. Limiting plate; 21. Hook. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0018] Please see Figures 1 to 4 A screen plate replacement device for a coal preparation machine vibrating screen includes: a crossbeam 1, a support 4, a drive structure, and an adjustment structure. A threaded rod 2 is rotatably connected inside the crossbeam 1. Connecting beams 3 are symmetrically slidably connected inside both ends of the crossbeam 1. The two connecting beams 3 are respectively threaded to both ends of the threaded rod 2. The ends of the two connecting beams 3 that are far apart from each other are fixedly connected to the support 4. Support rods 5 are symmetrically fixedly connected to the top of the crossbeam 1. A sleeve 6 is rotatably connected between the two support rods 5. A lever 7 is installed inside the sleeve 6. A hook 21 is rotatably connected to one end of the resistance arm of the lever 7. A drive structure for adjusting the distance between the two supports 4 is provided inside the crossbeam 1. An adjustment structure is installed between the sleeve 6 and the lever 7. The two supports 4 and the two support rods 5 are all hollow. The threaded rod 2 is a bidirectional threaded rod, and a limit plate 20 is fixedly connected to both ends of the threaded rod 2.

[0019] The drive structure includes a worm gear 8 and a worm 9. The worm gear 8 is fixedly connected to the middle of the threaded rod 2. The worm 9 is rotatably connected to the middle of the crossbeam 1. The worm 9 meshes with the worm gear 8. One end of the worm 9 extends out of the crossbeam 1 and is fixedly connected to a connecting plate 10. A crank 11 is fixedly connected to one side of the connecting plate 10 away from the center.

[0020] The adjustment structure includes: an arc-shaped locking block 17 and a locking groove 18. A connecting seat 12 is fixedly connected to the middle of the sleeve 6. A groove 13 is opened inside the connecting seat 12. A sliding plate 14 is slidably connected to the inner wall of the groove 13. A spring 15 is fixedly connected between the inner wall of the groove 13 and the sliding plate 14. A square rod 16 is fixedly connected to the middle of the sliding plate 14. One end of the square rod 16 extends out of the sliding plate 14 and is fixedly connected to the arc-shaped locking block 17. A locking groove 18 is opened at equal intervals at one end of the lever 7. The arc-shaped locking block 17 engages with the locking groove 18. A pull ring 19 is fixedly connected to one end of the square rod 16 extending out of the connecting seat 12.

[0021] The working principle of the screen plate replacement device for the vibrating screen of the coal preparation machine provided by this utility model is as follows: The device adapts to screen plates of different sizes through an adjustable support structure, flexibly controls the labor-saving effect through an adjustable lever 7 structure, and ultimately achieves non-violent disassembly of the screen plate through the transmission of lever 7. The overall structure is based on "crossbeam 1 as the basic load-bearing structure, bracket 4 as the stable support, and lever 7 as the power transmission structure". Combined with the drive structure (adjusting the support size) and the adjustment structure (optimizing the lever 7 lever arm), it forms a closed-loop operation of "precise adaptation - labor saving as needed - safe disassembly", which fully echoes the core principles of "high efficiency, safety, equipment protection, and low cost".

[0022] Specific working steps and component coordination principles Step 1: Screen Plate Size Adaptation – Synergy between Drive Structure and Bidirectional Threaded Rod 2 This step overcomes the limitation of traditional fixed-size bases that "only fit a single screen plate." By adjusting the spacing of the support brackets 4 through the drive structure, it can adapt to screen plates of different widths in coal preparation machine vibrating screens. The specific operation is as follows: Power input and transmission start: The operator turns the crank handle 11, which drives the connecting plate 10 fixed to it to rotate (the crank handle 11 is designed to be far from the center of the connecting plate 10, which conforms to the principle of saving effort and reducing the initial operating force); the connecting plate 10 drives the worm gear 9 to rotate synchronously (one end of the worm gear 9 extends out of the crossbeam 1 and is fixed to the connecting plate 10).

[0023] The worm gear 8 and worm 9 reduce speed and self-locking transmission: The worm 9 meshes with the worm gear 8 inside the crossbeam 1 (the worm gear 8 is fixed in the middle of the threaded rod 2). Because the worm gear 8 and worm 9 transmission has the characteristics of "reduction and torque increase + self-locking": On the one hand, the high-speed rotation of the worm 9 is converted into the low-speed rotation of the worm gear 8, which increases the torque of the threaded rod 2 and ensures that the connecting beam 3 slides smoothly; on the other hand, the worm gear 8 cannot drive the worm 9 to rotate in the opposite direction, which can prevent the threaded rod 2 from rotating on its own after adjustment, ensure the stability of the bracket 4 spacing, and eliminate the safety hazard of device displacement during disassembly.

[0024] The spacing adjustment between the bidirectional threaded rod 2 and the connecting beam 3: the worm gear 8 drives the bidirectional threaded rod 2 to rotate (the threaded rod 2 is designed bidirectionally, with the thread directions at both ends being opposite); the connecting beams 3 at both ends of the threaded rod 2 are threadedly connected to the threaded rod 2, and the sliding of the connecting beams 3 inside the crossbeam 1 is restricted (it only slides along the length direction of the crossbeam 1). Therefore, when the threaded rod 2 rotates, the connecting beams 3 at both ends will slide synchronously in opposite directions along the crossbeam 1, thereby driving the brackets 4 at the ends of the connecting beams 3 to adjust the spacing.

[0025] Limiting and stabilizing the end: The limiting discs 20 at both ends of the threaded rod 2 can prevent the connecting beam 3 from sliding excessively and detaching from the crossbeam 1, ensuring structural integrity; when the spacing of the brackets 4 is adjusted to match the width of the screen plate (the brackets 4 can be stably supported on both sides of the screen surface), stop turning the crank 11. At this time, the self-locking characteristics of the worm gear 8 and worm 9 keep the brackets 4 at the current spacing, providing stable support for subsequent disassembly.

[0026] Step 2: Lever 7 lever arm adjustment – ​​coordination of adjustment structure and pull ring 19 This step addresses the problem of traditional fixed lever 7 being "incompatible with screen plates of varying strengths." By adjusting the position of lever 7 within sleeve 6, the "power arm / resistance arm" ratio is optimized, allowing for controlled, effortless disassembly (e.g., increasing the power arm when the screen plate is tightly fitted, resulting in less effort). The specific operation is as follows: Unlocking lever 7: The operator pulls the pull ring 19 (the pull ring 19 is fixed to one end of the square rod 16 extending out of the connecting seat 12). The pull ring 19 drives the square rod 16 to move away from the lever 7. The square rod 16 simultaneously drives the slide plate 14, which is fixed to it, to slide in the groove 13 of the connecting seat 12. The slide plate 14 compresses the spring 15 (the two ends of the spring 15 are fixed to the inner wall of the groove 13 and the slide plate 14, respectively). At this time, the arc-shaped locking block 17 (fixed to one end of the square rod 16 near the lever 7) moves with the square rod 16 and disengages from the locking groove 18 on the lever 7, thus releasing the lever 7 from its fixed position.

[0027] Adjusting the lever arm length: The sleeve 6 is rotatably connected between two support rods 5 (the support rods 5 are fixed to the top of the crossbeam 1, providing a support point for the lever 7). The lever 7 can move along its length within the sleeve 6. Depending on the firmness of the screen plate, move the lever 7: If the screen plate is tight, increase the "power arm (distance from the operator's pressing end to the support point of the sleeve 6)" and decrease the "resistance arm (distance from the end of the hook 21 to the support point of the sleeve 6)" to improve the labor-saving effect; if the screen plate is loose, the power arm can be appropriately shortened to improve operational flexibility.

[0028] Locking lever 7 position: After adjusting to the appropriate lever arm, release pull ring 19. Spring 15 returns to its original position under the action of elastic force, pushing slide plate 14 and square rod 16 to move towards lever 7. Arc-shaped locking block 17 is locked into the corresponding locking groove 18 on lever 7 (the locking groove 18 is equidistant to ensure the accuracy of lever arm adjustment). The position of lever 7 is fixed, providing a stable power transmission ratio for subsequent disassembly.

[0029] Step 3: Safe disassembly of the sieve plate – the coordination of lever 7 and hook 21 This step is the core execution step of the device, fully adhering to the operational logic of "precise hooking and non-violent disassembly." It achieves rapid and safe separation of the screen plate through lever 7 transmission. The specific operation is as follows: Positioning of hook 21: A 20mm×20mm process hole is opened on the edge of the screen plate to be replaced; the hook 21 of the device (rotatably connected to one end of the resistance arm of the lever 7, which can adapt to the screen plate angle) is passed through the process hole and accurately hooked onto the middle skeleton of the screen plate (to avoid hooking the screen surface and causing the screen plate to deform).

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A screen plate replacement device for a coal preparation machine vibrating screen, characterized in that, include: A crossbeam (1) is rotatably connected to a threaded rod (2) inside the crossbeam (1). Connecting beams (3) are symmetrically slidably connected to both ends of the crossbeam (1). The two connecting beams (3) are respectively threaded to both ends of the threaded rod (2). The bracket (4) is fixedly connected to one end of the two connecting beams (3) that are far apart from each other. The top of the crossbeam (1) is symmetrically fixedly connected to the support rod (5). The two support rods (5) are rotatably connected to the sleeve (6). The sleeve (6) is equipped with a lever (7). One end of the resistance arm of the lever (7) is rotatably connected to a hook (21). The drive structure has a drive structure inside the crossbeam (1) for adjusting the distance between the two supports (4); An adjustment structure is installed between the sleeve (6) and the lever (7).

2. The screen plate replacement device for a coal preparation machine vibrating screen according to claim 1, characterized in that, The drive structure includes a worm gear (8) and a worm (9). The worm gear (8) is fixedly connected to the middle of the threaded rod (2). The worm (9) is rotatably connected to the middle of the crossbeam (1). The worm (9) meshes with the worm gear (8). One end of the worm (9) extends out of the crossbeam (1) and is fixedly connected to a connecting plate (10). A crank (11) is fixedly connected to one side of the connecting plate (10) away from the center.

3. The screen plate replacement device for a coal preparation machine vibrating screen according to claim 1, characterized in that, The adjustment structure includes: an arc-shaped locking block (17) and a locking groove (18). A connecting seat (12) is fixedly connected to the middle of the sleeve (6). A groove (13) is opened inside the connecting seat (12). A sliding plate (14) is slidably connected to the inner wall of the groove (13). A spring (15) is fixedly connected between the inner wall of the groove (13) and the sliding plate (14). A square rod (16) is fixedly connected to the middle of the sliding plate (14). One end of the square rod (16) extends out of the sliding plate (14) and is fixedly connected to the arc-shaped locking block (17). A locking groove (18) is opened at equal intervals at one end of the lever (7). The arc-shaped locking block (17) and the locking groove (18) are engaged.

4. The screen plate replacement device for a coal preparation machine vibrating screen according to claim 3, characterized in that, One end of the square rod (16) extends out of the connecting seat (12) and is fixedly connected to a pull ring (19).

5. The screen plate replacement device for a coal preparation machine vibrating screen according to claim 1, characterized in that, Both of the brackets (4) and the two support rods (5) are hollow inside.

6. The screen plate replacement device for a coal preparation machine vibrating screen according to claim 1, characterized in that, The threaded rod (2) is a bidirectional threaded rod, and both ends of the threaded rod (2) are fixedly connected to limit plates (20).

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