Vibrating screen for screening aggregate and / or soil
By combining the oblique chute-shaped vibrating screen plate and the fixed screen plate in the vibrating screen, the movement and local support of the vibrating flat steel in the fixed screen groove are achieved by using the power of the rotation of the eccentric shaft, and the energy consumption of the vibrating screen in the prior art is solved. The problems of high and low screening efficiency have significantly improved screening efficiency.
Patent Information
- Application Number
- CN202380037179.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-04
- Filing Date
- 2023-04-17
- Publication Date
- 2024-12-10
AI Technical Summary
Existing vibrating screens consume high energy, high operating power requirements, and low screening efficiency, especially due to the lack of vibration characteristics and the combination of fixed screen plates, resulting in poor material movement efficiency.
The combination of a chute-shaped vibrating screen plate and a fixed screen plate is adopted to move the vibrating flat steel in the fixed screen groove by rotating the eccentric shaft, providing local support and gradually increasing the material to be screened, reducing energy consumption and starting torque, and improving screening efficiency.
The energy consumption and operating power of the vibrating screen are significantly reduced, the screening efficiency is improved, and the continuous rotation and partial rise of the material is achieved through the chute shape and the design of curved flat steel, reducing the overall improvement demand of the material.
Smart Images
Figure CN119110865A_ABST
Abstract
Description
[0001] The invention relates to a vibrating screen for screening aggregates and / or soil, the screen comprising a body, a chute-shaped fixed screen plate, the chute-shaped fixed screen plate being fixedly mounted to the body by its opposite ends, the fixed screen plate comprising fixed screen flatbars, the fixed screen flatbars forming a first screen slot between them and the curved shape of the fixed screen flatbars corresponding to the shape of the fixed screen plate. The vibration characteristics of the screen are provided by the chute-shaped vibrating screen plate, which is arranged in connection with the fixed screen plate, so that the fixed screen plate flatbars and the vibrating flatbars of the vibrating screen plate are adjacent to each other and one after the other.
[0002] From publication EP 2778292 B1 a screening and crushing device for aggregates and / or soil is known, which has a fixed screen plate in the form of a chute, in which blades fixed to a rotating shaft move in the screen slots. The shaft is positioned below the screen plate so that only the tips of the blades extend above the screen plate. This known screen is not a vibrating screen, since the shaft and the blades rotate about their straight axis without vibrating characteristics.
[0003] A vibrating screen is known from publication EP 2581140 B1 (FIG. 1) which does not have a fixed screen plate and whose vibrating screen plate providing the vibration characteristics is planar. Therefore, a large amount of energy is required to move the material to be screened during each vibration impact, since the entire material must be lifted at once.
[0004] The object of the present invention is to provide an improved vibrating screen, the energy consumption and the required operating power of which can be significantly reduced while the screening efficiency is improved.
[0005] This object is achieved by a vibrating screen according to the present invention, which comprises a chute-shaped vibrating screen plate, which is supported to the body by an eccentric shaft and is arranged to be vibrated by machine power by rotating the eccentric shafts synchronously with each other, so that when the eccentric shafts rotate, each point of the screen plate is continuously in rotational motion along a circular path in the same rotation direction. The vibrating screen plate comprises vibrating flat steels, which form a second screen slot between them, and the curved shape of the vibrating flat steels corresponds to the chute shape of the vibrating screen plate. The vibrating flat steels are located between the first screen slots, and the screen plates are positioned relative to each other at such a height level that within one cycle, the vibrating flat steels rise partially above the screen surface formed by the upper edge of the fixed screen flat steels one after another and at different times at different sections of the fixed screen plate.
[0006] This differs from the vibrating screen known from publication EP 2581140 B1 primarily in that in the present invention a fixed screen plate is also used, wherein the vibrating flat steel moves in the screen slot, and both screen plates are cutter-shaped. Thus, the fixed screen plate temporarily and partially supports the material to be screened, and the vibrating screen plate lifts different parts of the material to be screened at different times, which reduces energy consumption and the required starting torque and provides rotation of the material on the screen plate, which increases the screening efficiency.
[0007] Example embodiments of the present invention will now be described more closely with reference to the accompanying drawings, in which:
[0008] FIG1 shows a partial cross-sectional view of a vibrating screen and an end portion according to the prior art publication EP 2581140 B1, seen from below;
[0009] Figure 2 A vibrating screen according to the invention is shown as seen from the end, the end being a cross-sectional view with components removed from the end of the eccentric shaft 2;
[0010] Figure 3 A cross section of a vibrating screen plate according to the present invention is shown axonometrically;
[0011] Figure 4 The elements that hold the screen plate are shown axonometrically;
[0012] Figure 5 A vibrating screen according to the invention is shown axonometrically from the top so that one end is a cross-sectional view.
[0013] Figure 6 Axonometrically a vibrating screen according to the invention is shown from the top, the vibrating screen being arranged to a bucket movable by a heavy machine.
[0014] The vibrating screen comprises a body 1 including a plate wall and a fixing structure of screen plates 6, 7 defining a screening space. The chute-shaped fixed screen plate 6 is fixed to the body 1 by its opposite ends. Figure 4 The fixed screen plate 6 can be formed by three adjacent elements. The fixed screen plate 6 includes fixed screen flat steels 8, which form first screen slots 8a between them. The curved shape of the screen flat steels 8 corresponds to the shape of the inclined slots of the fixed screen plate 6.
[0015] The vibrating screen plate 7 includes vibrating flat steels 9, which form a second screen slot 9a between them and the bending shape of the vibrating flat steels corresponds to the oblique slot shape of the vibrating screen plate 7. The vibrating screen plate 7 is supported to the body 1 by an eccentric shaft 2. The two eccentric shafts 2 include end portions and a throw shaft 2a located between the end portions, and the center axis of the throw shaft 2a is at a short radial distance from the rotation axis of the end portion. Therefore, the throw shaft 2a rotates eccentrically relative to the center axis of the end portion of the eccentric shaft 2. The eccentric shaft 2 is rotatably bearing-mounted by a body bearing 3, and the body bearing is fixed to the body 1 around the end portion. Figure 5 The main bearing 3 is shown in FIG. 1 , and the fixing flange of the main bearing 3 is Figure 2 1 is partially shown at the opposite end of the shaft 2. The corresponding body bearing 3 can also be seen in FIG. 1, which shows a rotary motor 13 of the eccentric shaft 2 in a housing 16 and a chain or toothed belt 14, through which the rotary drive is transmitted to the eccentric shaft 2. FIG. 1 also shows a chain or belt 15 connecting the opposite ends of the eccentric shaft 2, through which the rotary drive is transmitted to the other eccentric shaft 2, so that the eccentric shafts 2 rotate synchronously with each other. In the present invention, a similar driving force device can be used, whose motor is Figure 6 The shaker bucket 20 shown in FIG. 1 is in the housing 16 , and the power transmission device is located in the housing 14 .
[0016] The wrench shaft 2a is supported by the bearing 5 in the body tube 4 of the vibrating screen plate 7. The vibrating flat steel 9 is fixed to the body tube 4 by the fixing device 4a. Therefore, the vibrating screen plate 7 formed by the vibrating flat steel 9 can be vibrated by machine power by rotating the eccentric shafts 2 synchronously with each other, so that as the eccentric shaft 2 rotates, each point of the vibrating screen plate 7 continuously moves in a circular path in the same rotation direction, and the radius of the circular path corresponds to the eccentricity between the end portion of the eccentric shaft 2 and the wrench shaft 2a. This eccentricity between the body bearing 3 and the bearing 5 of the wrench shaft 2a is generally 15mm to 25mm, for example, in Figure 6 In the embodiment of the invention, the screen panels 6, 7 form a vibrating screen panel of a bucket 20 of a heavy machine, and the body 1 of the screen is fixedly connected to the bucket 20. The vibrating screen bucket 20 can be connected to the boom of the heavy machine via the lugs 17.
[0017] The rotation speed of the eccentric shaft 2 can be, for example, in the range of 700rpm to 1200rpm, so that the vibration frequency exceeds the characteristic vibration frequency of the structure of the vibrating screen according to the present embodiment. High rotation speed, i.e. high vibration frequency, achieves good screening capacity. For small eccentricity values, the rotation speed can be in the range of 1200rpm to 1500rpm, because it achieves sufficient circumferential speed (i.e. sufficient surface speed of the vibrating screen plate 7) in the circular path to achieve sufficiently fast circular motion of the material. The rotation speed can also be lower than the characteristic vibration frequency of the screen, for example 400rpm to 500rpm.
[0018] When the eccentric shaft 2 rotates, the entire rotating mass generates a rotational force in the radial direction of the shaft 2, which is balanced by the counterweight 12 attached to the end of the shaft 2. The distance between the center of mass of the counterweight 12 and the rotation axis of the body bearing 3 is multiple times (for example, 10 times) compared to the eccentricity of the eccentric shaft 2, so a counterweight of one tenth of the mass of the screening structure moving with the eccentric shaft 2 is required.
[0019] Figure 3 It is shown that the ends of the body tubes 4 are connected to each other by support rods 19 which reinforce the vibrating screen deck 7 .
[0020] The vibrating screen plate 7 comprises a vibrating flat steel 9 which forms a second screen slot 7a between them and whose bending shape corresponds to the shape of the chute of the vibrating screen plate 7. The vibrating flat steel 9 is located in the first screen slot 8a. The screen plates 6, 7 are positioned at such a height level relative to each other that the vibrating flat steel 9 partially rises above the screen surface formed by the upper edge of the fixed screen flat steel 8 one after another and at different times at different sections of the fixed screen plate 6 within one cycle of the eccentric shaft 2. Due to the chute shape of the screen plates 6, 7, the circular movement of the screen plate 7 causes the vibrating flat steel 9 of the screen plate 7 to sink below the upper surface of the screen flat steel 8 of the screen plate 6 for about half a cycle, so the entire material to be screened does not have to be lifted in any case. During the circular movement of the screen plate 7, the vibrating flat steel 9 first rises from the front edge of the screen to above the upper surface of the fixed screen plate 6, and then in the direction of movement, the peak of the rise moves toward the rear edge of the screen. Therefore, the entire material to be screened is not lifted at the same time. Furthermore, due to the curved shape of the screen plates 6, 7, the mass movement is not only an up / down movement, but a simultaneous up / down movement to balance the interaction of different parts of the mass. Furthermore, when the moving mass of the screen balanced by the counterweight 12 is reduced, the power requirement at the start time is reduced and the total mass of the screen is reduced. At the same time, the material to be screened is made to move in a circular motion, which improves the screening capacity.
[0021] Preferably, the curvatures of the fixed screen flat steel 8 and the vibrating screen flat steel 9 correspond to each other, so that the trough-like shapes of the fixed screen plates 6 and the vibrating screen plates 7 correspond to each other. As long as the vibrating screen flat steel 9 remains in the screen slot 8a between the screen flat steels 8, small differences in the curvature of the screen plates 6, 7 are possible. Therefore, the height of the screen flat steel 8 and the vibrating screen flat steel 9 must be substantially greater than 2 times the value of the eccentric shaft 2, which is the same as the diameter of the circular movement of each point of the vibrating screen flat steel 9.
[0022] In a preferred embodiment of the present invention, the fixed screen flat steel 8 and the vibrating flat steel 9 are bent only at the central section of the screen plates 6, 7. The fixed screen flat steel 8 and the vibrating flat steel 9 are straight at the end sections of the screen plates 6, 7. The angle α between the end sections of the screen plates 6, 7 is in the range of 80 to 120 degrees, preferably 85 to 100 degrees, and usually about 90 degrees.
[0023] In a preferred embodiment of the present invention, the upper edge of the vibrating flat steel 9 of the vibrating screen plate 7 has local protrusions 9a. These local protrusions 9a are positioned offset from each other. The protrusions 9a promote the rotation of the material on the screen plate.
[0024] like Figure 4 As shown, the guide groove 8b narrower than the sieve groove is positioned at the end of the sieve groove 8a of the fixed sieve plate 6, wherein the end of the vibrating flat steel 9 of the vibrating sieve plate 7 is positioned at the end of the sieve groove 8a of the fixed sieve plate 6. Therefore, the vibrating flat steel 9 is guided in the middle of the sieve groove 8a. In addition, the side surface of the fixed sieve flat steel 8 may have a local protrusion that supports and guides the vibrating flat steel 9 to move in the sieve groove 8a.
[0025] The gap between the screen flat steel 8 and the vibrating flat steel 9 determines the size of the portion of the screened material, which can be influenced by the thickness and distance between the screen flat steel 8 and the vibrating flat steel 9. Figure 4 The elements of the fixed screen plate 6 can be made of screen flat steels 8 with different thicknesses and different screen slots 8a. Figure 3 The vibrating flat steels 9 of the vibrating screen plate 7 can be manufactured to have different thicknesses, and they can be attached to the body tube 4 of the vibrating screen plate 7 at desired intervals. Therefore, the size of the part to be screened can be easily selected and changed.
Claims
1. A vibrating screen for screening aggregates and / or soil, the screen comprising a body (1), a chute-shaped fixed screen plate (6), the fixed screen plate being fixedly mounted to the body (1) via its opposite ends, the fixed screen plate comprising fixed screen flat steels (8), the fixed screen flat steels forming a first screen slot (8a) between the fixed screen flat steels and the fixed screen flat steels having a curved shape corresponding to the shape of the fixed screen plate (6), characterized in that The screen comprises a trough-shaped vibrating screen plate (7), which is supported on the body by an eccentric shaft (2), and the vibrating screen plate is configured to vibrate by machine power by rotating the eccentric shaft (2) synchronously with each other, so that when the eccentric shaft (2) rotates, each point of the screen plates (6, 7) continuously rotates along a circular path in the same rotation direction, the vibrating screen plate (7) comprises vibrating flat steels (9), the vibrating flat steels form a second screen slot (7a) between the vibrating flat steels and the bending shape of the vibrating flat steels corresponds to the trough shape of the vibrating screen plate, the vibrating flat steels (9) are located in the first screen slot (8a), and the screen plates (6, 7) are positioned at such a height level relative to each other that within one cycle, the vibrating flat steels (9) partially rise above the screen surface formed by the upper edge of the fixed screen flat steel (8) one by one and at different times at different sections of the fixed screen plate (6).
2. The vibrating screen according to claim 1, characterized in that: The fixed screen flat steel (8) and the vibrating flat steel (9) are bent at the central section of the screen plates (6, 7), and the fixed screen flat steel (8) and the vibrating flat steel (9) are straight at the end sections of the screen plates.
3. The vibrating screen according to claim 1 or 2, characterized in that: The angle between the end portions of the screen plates is in the range of 80 degrees to 120 degrees.
4. The vibrating screen according to claim 3, characterized in that: The angle between the end portions of the screen plates is in the range of 85 degrees to 100 degrees.
5. The vibrating screen according to any one of claims 1 to 4, characterized in that: The screen panels (6, 7) form the base of a movable bucket (20) of a heavy machine, and the body (1) of the screen is fixedly connected to the bucket (20).
6. The vibrating screen according to any one of claims 1 to 5, characterized in that: The upper edge of the vibrating flat steel (9) of the vibrating screen plate (7) has a local protrusion (9a).
7. The vibrating screen according to claim 6, characterized in that: The local protrusions (9a) of different vibrating flat steels (9) are positioned offset from each other.
8. The vibrating screen according to any one of claims 1 to 7, characterized in that: A narrower guide groove (8b) is provided at the end of the screen slot (8a) of the fixed screen plate (6), and the end of the vibrating flat steel (9) of the vibrating screen plate (7) is located in the guide groove.
9. The vibrating screen according to any one of claims 1 to 8, characterized in that: The side surface of the fixed screen flat steel (8) has a local protrusion, and the local protrusion supports and guides the vibrating flat steel (9) to move in the screen slot (8a).
10. The vibrating screen according to any one of claims 1 to 9, characterized in that: The curvatures of the fixed screen flat steel (8) and the vibrating flat steel (9) correspond to each other, so that the inclined groove shapes of the fixed screen plate (6) and the vibrating screen plate (7) correspond to each other.
11. The vibrating screen according to any one of claims 1 to 10, characterized in that: The end portions of the eccentric shaft (2) are bearing-mounted to the body (1) via body bearings (3), and an eccentric actuating shaft (2a) is provided between the end portions of the eccentric shaft (2), the actuating shaft being eccentric relative to the end portions and bearing-mounted (5) inside the body tube (4) of the vibrating screen plate (7).
12. The vibrating screen according to any one of claims 1 to 11, characterized in that: The eccentricity of the eccentric shaft (2) is in the range of 15 mm to 25 mm, so the radius of the circular path of the vibrating motion is in the range of 30 mm to 50 mm.