Waste screening device and vertical mill ore grinding system

Abstract

The utility model discloses a waste screening device and a vertical mill ore grinding system in the technical field of ore grinding, which comprises a casing, a mixed waste inlet arranged at the top of the casing, an oversize material outlet and an undersize material outlet respectively arranged at two sides of the bottom of the casing, a jolting screening ramp and a fixed guide ramp arranged in the casing, the jolting screening ramp is composed of a plurality of jolting screen units which are obliquely arranged and vertically spliced in a staggered mode, each jolting screen unit comprises a screen plate, the upper end of each screen plate is hinged to the machine shell, the lower end of each screen plate is connected with a jolting driving device, and the jolting driving devices drive the lower ends of the screen plates to move in a frequency mode to achieve material screening. Not only can the material screening efficiency be improved, but also nails and hard impurities clamped in the screen holes in the screen plate can be shaken out, and the screen holes are prevented from being blocked; the vertical grinding system is additionally provided with the waste screening device, impurities are prevented from being enriched in the system, and it is guaranteed that the vertical roller mill operates stably for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of ore grinding, in particular to a waste screening device and a vertical grinding system. Background Art

[0002] Vertical roller mills are key equipment for fine grinding of materials. As production scale expands, their load and operating time continue to climb, requiring them to operate virtually non-stop. Furthermore, the complex raw material supply chain inevitably introduces large, bulky materials of varying sizes, including scrap metal from the production area and rock lumps introduced during mining and transportation. Typically, companies install equipment such as vibrating screens and electromagnetic iron removers in the mill's pre-grinding process to remove debris, but this removal rate can rarely reach 100%.

[0003] In actual production, companies generally recycle the waste discharged from the mill directly into the mill to avoid the loss and waste of core materials. This causes some debris, such as stainless steel objects, to accumulate in the process, posing greater risks to the operation of the mill.

[0004] Based on this, the utility model designs a waste screening device and a vertical mill grinding system to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a waste screening device and a vertical grinding system to solve the above technical problems.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A waste screening device comprises a casing, wherein a mixed waste inlet is provided at the top of the casing, an oversize material outlet and a undersize material outlet are respectively provided on both sides of the bottom of the casing, and a tumbling screening ramp and a fixed guide ramp are provided in the casing, wherein the upper end of the tumbling screening ramp is connected to the mixed waste inlet and the lower end is connected to the oversize material outlet, and the fixed guide ramp is located below the tumbling screening ramp and the lower end is connected to the undersize material outlet;

[0008] The shaking screening ramp is composed of several shaking screen units that are arranged obliquely and staggered up and down. The shaking screen unit includes a screen plate. The upper end of the screen plate is hinged to the casing. The lower end of the screen plate is connected to a shaking drive device. The shaking drive device drives the lower end of the screen plate to move frequently to achieve material screening.

[0009] Preferably, the surface of the sieve plate is densely covered with sieve holes, the upper end of the bottom surface of the sieve plate is hinged with a pin, and both ends of the pin are fixedly mounted on the side walls of the casing.

[0010] Preferably, the shaking drive device includes a winch box, a drum is provided in the winch box, a reel is passed through the inside of the drum, both ends of the reel are rotatably installed on the side walls of the winch box, a traction rope is wound around the reel, the end of the traction rope is suspended and extends into the casing and is connected to the lower end of the screen plate, a gear box is provided on the outside of the winch box, a driving gear and a driven gear that can be intermittently meshed are provided in the gear box, a part of the circumference of the driving gear is distributed with continuous meshing teeth, a driving motor connected to the driving gear is installed on the outside of the gear box, and the driven gear is fixedly sleeved on one end of the reel.

[0011] Preferably, a guide roller is provided inside the gear box, and the traction rope abuts against the guide roller.

[0012] Preferably, a protective sleeve is sleeved on the end of the traction rope, and the protective sleeve is fixedly arranged on the screen plate.

[0013] A vertical mill grinding system includes the aforementioned waste screening device, and also includes a vertical roller mill, a mixing conveyor belt, a buffer material pool, a bucket elevator, a magnetic separator, a metering bin and a return material conveyor belt; the slag discharge port of the vertical roller mill is connected to the mixed waste inlet of the waste screening device through the mixing conveyor belt, the undersize material outlet of the waste screening device is connected to the buffer material pool, the bucket elevator is connected between the buffer material pool and the magnetic separator, the output end of the magnetic separator is connected to the metering bin, and the output end of the metering bin is connected to the feed port of the vertical roller mill through the return material conveyor belt.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The waste screening device of the utility model has a built-in shaking screening ramp, in which the upper end of the screen plate is hinged to the casing, and the lower end of the screen plate is connected to a shaking drive device, which drives the lower end of the screen plate to move frequently to achieve material screening; compared with the transmission vibrating screen, the repeated frequent pulling and pulling of the traction rope can drive each screen plate to achieve larger floating bumps, so that the mixed material on the screen plate can rise and fall fully, which can not only improve the material screening efficiency, but also shake out nails and hard debris stuck in the sieve holes on the screen plate to prevent the sieve holes from being blocked.

[0016] The utility model vertical grinding system adds the above-mentioned waste screening device in the waste recycling process discharged from the vertical roller mill, which can perform in-depth screening treatment on the waste discharged from the mill, thereby screening out the impurities that cannot be removed before the material enters the mill for the first time, preventing these impurities from being enriched in the system, and ensuring the stable and long-term operation of the vertical roller mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the vertical roller mill of the utility model;

[0019] Figure 2 for Figure 1 A local enlarged structural diagram in FIG.

[0020] Figure 3 This is a schematic structural diagram of the shaking drive device of the utility model;

[0021] Figure 4 This is a schematic diagram of the intermittent meshing structure of the gears inside the gear box of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the vertical mill grinding system of the utility model. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the utility model embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the utility model embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of utility model protection.

[0024] Example 1

[0025] See also Figure 1-2 , the utility model provides a technical solution:

[0026] A waste screening device includes a casing 10. A mixed waste inlet 11 is provided on the top of the casing 10. An oversize material outlet 12 and an undersize material outlet 13 are respectively provided on both sides of the bottom of the casing 10.

[0027] A shaking screening ramp 40 and a fixed guide ramp 50 are provided in the casing 10. The upper end of the shaking screening ramp 40 is connected to the mixed waste inlet 11, and the lower end is connected to the oversize material outlet 12. The fixed guide ramp 50 is located below the shaking screening ramp 40, and the lower end is connected to the undersize material outlet 13.

[0028] The shaking screening ramp 40 is composed of a number of shaking screen units 41 that are inclined and staggered up and down. In this embodiment, the shaking screen units 41 have the same inclination angle and are three in number. The number can actually be increased or decreased according to production needs; the two adjacent shaking screen units 41 are staggered, that is, the tail end of the upstream shaking screen unit 41 is located above the side of the downstream shaking screen unit 41, and the projections of the upstream and downstream shaking screen units 41 on the horizontal plane have overlapping parts; it does not affect the independent shaking of the shaking screen unit 41, and can also ensure the smooth sliding delivery of the material.

[0029] The shaking screen unit 41 includes a screen plate 411, the surface of which is densely covered with screen holes. The upper end of the screen plate 411 is hinged to the casing 10. Specifically, the upper end of the bottom surface of the screen plate 411 is hinged to a pin 412, and both ends of the pin 412 are fixedly installed on the side walls of the casing 10.

[0030] like Figure 3 As shown, the lower end of the sieve plate 411 is connected to a shaking drive device 42, which drives the lower end of the sieve plate 411 to move frequently to achieve material screening; specifically, the shaking drive device 42 includes a winch box 421, a reel 422 is provided in the winch box 421, a reel 423 is passed through the reel 422, and both ends of the reel 423 are rotatably mounted on the side wall of the winch box 421, and a traction rope 424 is wound around the reel 423. The traction rope 424 is wound around the reel 423. 4 The end is suspended and extends into the casing 10 and is connected to the lower end of the screen plate 411. A gear box 425 is provided on the outside of the winch box 421. A driving gear 426 and a driven gear 427 that can be intermittently meshed are provided in the gear box 425. A part of the circumference of the driving gear 426 is distributed with continuous meshing teeth. A driving motor 428 that is transmission-connected to the driving gear 426 is installed on the outside of the gear box 425. The driven gear 427 is fixedly sleeved with one end of the reel 423. During specific operation, the driving motor 428 drives the driving gear 426 to rotate continuously. Since the driving gear 426 is a broken tooth type, only when the part with meshing teeth rotates to the side of the driven gear 427 can it effectively transmit power, driving the driven gear 427 to rotate, and then winding the traction rope 424 through the reel 423 and the drum 422 to lift the lower end of the screen plate 411. Then, when the part of the driving gear 426 without meshing teeth rotates to the side of the driven gear 427, the driving gear 426 and the driven gear 427 are disengaged, the traction rope 424 loses traction, and the screen plate 411 falls rapidly under the action of its own weight. The repeated action realizes the shaking of the screen plate 411, so that the mixed material on the screen plate 411 is fully raised and lowered, which not only improves the material screening efficiency, but also can shake out nails and hard debris stuck in the sieve holes on the screen plate 411 to prevent the sieve holes from being blocked.

[0031] Furthermore, in order to save and optimize the structural space distribution, the top of the casing 10 is designed as a slope, and the rocking drive device 42 is attached to the top of the casing 10 in an inclined state. A guide roller 429 is provided inside the gear box 425, and the traction rope 424 is in contact with the guide roller 429 to guide the traction rope 424 to slide, thereby reducing the wear of the traction rope 424 caused by corner contact friction.

[0032] Furthermore, since the lower end of the traction rope 424 is connected to the screen plate 411 and frequently contacts the material during operation, a protective sleeve 4210 is sleeved on the end of the traction rope 424. The protective sleeve 4210 is fixed on the screen plate 411 to protect the traction rope 424 from wear caused by friction with the material.

[0033] Working principle example:

[0034] The mixed waste discharged from the vertical roller mill is discharged into the inner cavity of the casing 10 through the mixed waste inlet 11 at the top of the casing 10. The waste slides down the shaking screening ramp 40, and the larger hard material blocks and debris continue to roll down along the screen plate 411 and are discharged from the oversize material outlet 12 as waste residue, while the smaller material blocks pass through the sieve holes of the screen plate 411 and fall into the fixed guide ramp 50, and are discharged from the undersize material outlet 13 along the fixed guide ramp 50 into the material circulation system.

[0035] Example 2

[0036] like Figure 5 As shown, based on Example 1, this embodiment applies the waste screening device to the vertical mill grinding system. Specifically, the vertical mill grinding system also includes a vertical roller mill 1, a mixing conveyor belt 2, a buffer material pool 3, a bucket elevator 4, a magnetic separator 5, a metering bin 6 and a return material conveyor belt 7; the slag discharge port of the vertical roller mill 1 is connected to the mixed waste inlet 11 of the waste screening device 100 through the mixing conveyor belt 2, the undersize material outlet 13 of the waste screening device 100 is connected to the buffer material pool 3, the bucket elevator 4 is connected between the buffer material pool 3 and the magnetic separator 5, the output end of the magnetic separator 5 is connected to the metering bin 6, and the output end of the metering bin 6 is connected to the feed port of the vertical roller mill 1 through the return material conveyor belt 7; each circulation system equipment is connected according to Figure 5 The operation of the material flow line and the working principles of each circulation system device in the material circulation system are prior art and will not be described in detail in this embodiment.

[0037] In the vertical grinding system, the waste screening device mentioned above is added to the waste recycling process discharged from the vertical roller mill. The waste discharged from the mill can be screened in depth, thereby screening out the impurities that cannot be removed before the material enters the mill for the first time, preventing these impurities from being enriched in the system, and ensuring the stable and long-term operation of the vertical roller mill.

[0038] Although embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A waste screening device, characterized in that: The invention comprises a casing (10), wherein a mixed waste inlet (11) is provided at the top of the casing (10), an oversize material outlet (12) and an undersize material outlet (13) are respectively provided at both sides of the bottom of the casing (10), and a tumbling screening ramp (40) and a fixed guide ramp (50) are provided in the casing (10), wherein the upper end of the tumbling screening ramp (40) is connected to the mixed waste inlet (11) and the lower end is connected to the oversize material outlet (12), and the fixed guide ramp (50) is located below the tumbling screening ramp (40) and the lower end is connected to the undersize material outlet (13); The shaking screening ramp (40) is composed of a plurality of shaking screen units (41) that are arranged obliquely and staggered up and down. The shaking screen unit (41) includes a screen plate (411). The upper end of the screen plate (411) is hinged to the housing (10). The lower end of the screen plate (411) is connected to a shaking drive device (42). The shaking drive device (42) drives the lower end of the screen plate (411) to move frequently to achieve material screening. The surface of the sieve plate (411) is densely covered with sieve holes. The upper end of the bottom surface of the sieve plate (411) is hinged to a pin shaft (412), and both ends of the pin shaft (412) are fixedly mounted on the side wall of the casing (10).

2. A waste screening device according to claim 1, characterized in that: The shaking drive device (42) includes a winch box (421), a drum (422) is provided in the winch box (421), a reel (423) is passed through the drum (422), both ends of the reel (423) are rotatably mounted on the side wall of the winch box (421), a traction rope (424) is wound around the reel (423), and the end of the traction rope (424) is suspended and extends into the casing (10) and is connected to the lower end of the screen plate (411). A gear box (425) is provided on the outside of the hoist box (421), and a driving gear (426) and a driven gear (427) capable of intermittent meshing transmission are provided inside the gear box (425). Continuous meshing teeth are distributed on a portion of the circumference of the driving gear (426). A driving motor (428) connected to the driving gear (426) is installed on the outside of the gear box (425), and the driven gear (427) is fixedly sleeved with one end of the reel (423).

3. A waste screening device according to claim 2, characterized in that: A guide roller (429) is provided inside the gear box (425), and the traction rope (424) abuts against the guide roller (429).

4. A waste screening device according to claim 3, characterized in that: The end of the traction rope (424) is sleeved with a protective sleeve (4210), and the protective sleeve (4210) is fixedly arranged on the screen plate (411).

5. A vertical grinding system, comprising the waste screening device according to any one of claims 1 to 4, characterized in that: The invention also includes a vertical roller mill (1), a mixing conveyor belt (2), a buffer pool (3), a bucket elevator (4), a magnetic separator (5), a metering bin (6) and a return conveyor belt (7); the slag discharge port of the vertical roller mill (1) is connected to the mixed waste inlet (11) of the waste screening device (100) through the mixing conveyor belt (2), the undersize material outlet (13) of the waste screening device (100) is connected to the buffer pool (3), the bucket elevator (4) is connected between the buffer pool (3) and the magnetic separator (5), the output end of the magnetic separator (5) is connected to the metering bin (6), and the output end of the metering bin (6) is connected to the feed port of the vertical roller mill (1) through the return conveyor belt (7).

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