Vibrating screen and material screening apparatus

Abstract

The application provides a vibrating screen and a material screening device, relates to the technical field of industrial production equipment, and is characterized in that the surface of the screen is a curved surface, the profile line of the longitudinal section of the screen is a screen curve r(x), wherein r is the radius of the screen, x is the radius variable, and the curve function of the screen curve r(x) follows a normal distribution. The application solves the problems of low separation efficiency, easy blocking by viscous or irregular foreign matters and low screening precision of the traditional screening device when processing fine particle materials through matching of the centrifugal force field and the material distribution, and improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial production equipment, and in particular to a vibrating screen and a material screening device. BACKGROUND

[0002] Material screening, as a key link in industrial production, is widely used in mining, coal, building materials and chemical industries. The purpose is to separate different particle size materials through physical separation to meet the requirements of subsequent production process on material particle size. With the development of industrial technology, modern industrial production puts forward more strict technical indexes for screening equipment, including higher processing efficiency, more accurate separation precision, more flexible parameter adjustment ability and stronger adaptability.

[0003] Traditional material screening equipment mainly adopts mechanical structures such as vibrating screen and centrifugal screen, and realizes material separation through mechanical vibration or centrifugal force. In long-term production practice, these traditional devices have obvious technical defects when processing fine particle materials:

[0004] (1) Low separation efficiency: the traditional vibrating screen has a bottleneck in screening efficiency. Fine particles need to collide in the screening zone multiple times, but the actual residence time in the screening zone is insufficient, which makes it difficult to completely separate fine particles, resulting in low screening efficiency and increasing operation time;

[0005] (2) Easy to be blocked by sticky or irregular foreign matters: sticky particles and irregular foreign matters are easy to block the screen, resulting in a blockage rate of more than 30% in actual production, which needs to be frequently stopped for processing, affecting work efficiency;

[0006] Low screening precision: the conventional centrifugal screen is prone to the phenomenon that large particles are distributed on the outside and small particles are distributed on the inside due to unreasonable structure design, resulting in low screening precision. However, in actual demand, the material needs to be further finely screened to improve the separation precision.

[0007] These problems not only reduce production efficiency, increase energy consumption and maintenance cost, but also restrict the development of modern industry towards high efficiency and refinement. SUMMARY

[0008] The purpose of the present application is to provide a vibrating screen and a material screening device to alleviate the problems of low separation efficiency, easy to be blocked by sticky or irregular foreign matters and low screening precision of the traditional screening device when processing fine particle materials, and to improve production efficiency.

[0009] To achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

[0010] In a first aspect, embodiments of the present invention provide a vibrating screen, including a screen mesh, the surface of which is curved, and the contour line of its longitudinal cross-section is a screen mesh curve r(x), where r is the radius of the screen mesh and x is a radius variable, and the curve function of the screen mesh curve r(x) satisfies the following characteristics:

[0011] a) Satisfies the following in the central region:

[0012] , ;

[0013] Where: R start L is the starting radius of the sieve aperture area. trans H represents the length of the transition region. peak C represents the peak height of the central region. decay The attenuation coefficient of the Gaussian curve;

[0014] b) A cubic polynomial is used for smooth transition in the transition region, ensuring that the slope of the transition region curve is continuous with the slopes of the curves in the preceding and following regions, satisfying the following condition:

[0015]

[0016] Where t is the transition coefficient from 0 to 1, and h prev h is the starting height of the transition region. enxt For transition

[0017] Area endpoint altitude, S slope The slope of the sieve aperture area;

[0018] c) The following condition is satisfied in the sieve aperture region:

[0019] , ;

[0020] Among them, H base R is the reference height for the sieve aperture area. end The radius of the end of the sieve aperture region.

[0021] In an optional embodiment, when the diameter of the screen is 3000 mm, the screen openings are distributed within a region with a radius r = 1300 mm - 1500 mm on the screen, and the peak height H in the central region is... peak It is 600mm.

[0022] In an optional embodiment, when the diameter of the screen is 3000 mm and the screen openings are distributed within a radius r = 1300 mm - 1500 mm, the given parameter values ​​are:

[0023]

[0024]

[0025] The curve function of the screen curve r(x) satisfies any one of the following characteristics:

[0026] d) satisfies:

[0027] ,

[0028] Wherein: , R start is the starting radius of the screen hole area, L trans is the length of the curve transition area;

[0029] e) satisfies:

[0030] .

[0031] In an optional embodiment, the vibrating screen further comprises a discharging passage connector, a screen cover and a reinforcing flange;

[0032] The lower end of the discharging passage connector is fixed or integrally connected with the screen cover and penetrates the screen cover vertically; the screen cover is arranged above the screen and its edge portion is circumferentially rotatably connected with the edge portion of the screen; the reinforcing flange is fixedly connected to the middle portion of the screen and is used for being fixedly connected with the main rotating shaft penetrating the discharging passage connector.

[0033] In an optional embodiment, the edge portion of the screen cover is circumferentially rotatably connected with the edge portion of the screen through a bearing.

[0034] In an optional embodiment, a reinforcing rib is arranged between the outer sidewall of the lower end of the discharging passage connector and the upper surface of the screen cover, and / or between the reinforcing flange and the surface of the screen.

[0035] In a second aspect, the embodiments of the present application provide a material screening device, comprising the vibrating screen provided by any one of the optional embodiments of the first aspect.

[0036] The material screening device further comprises a rack, a discharging barrel, a motor one and a vibrating device;

[0037] The discharging barrel is installed on the rack, and the top surface thereof is provided with a feeding port and the middle portion of the bottom surface is provided with a material collecting port;

[0038] The motor one is installed on the rack, and the output end thereof is drivingly connected with a main rotating shaft extending in the vertical direction;

[0039] The vibrating screen is arranged inside the discharging barrel, the inner wall of the discharging barrel is fixedly provided with a support frame, and the discharging passage connector is fixedly installed on the support frame; the main rotating shaft penetrates the discharging passage connector and is fixedly connected with the reinforcing flange;

[0040] The vibrating device is installed on the frame and the vibrating part thereof is connected with the outer side wall of the discharge barrel for driving the discharge barrel to vibrate.

[0041] In an optional embodiment, the vibrating device comprises a second motor, a centrifugal block, a connecting component and an inertial exciter.

[0042] The input shaft of the inertial exciter is rigidly connected with the outer side wall of the discharge barrel through the connecting component.

[0043] The centrifugal block is rotatably installed on the input shaft of the inertial exciter.

[0044] The second motor is installed on the frame or the outer side wall of the discharge barrel, and a driving wheel is sleeved on the output shaft of the second motor, the driving wheel is connected with a transmission wheel through a transmission belt, and the transmission wheel is coaxially connected with the centrifugal block, so that the second motor can drive the centrifugal block to rotate, and further excite the inertial exciter to vibrate.

[0045] In an optional embodiment, the material screening device further comprises at least one elastic damping device.

[0046] Each of the elastic damping devices comprises a spring damping support, a spring and a damping rib plate.

[0047] The lower end of the spring damping support is fixedly connected with the frame.

[0048] The damping rib plate is fixedly connected with the outer side wall of the discharge barrel.

[0049] The lower end of the spring is fixedly connected with the spring damping support, and the upper end of the spring is fixedly connected with the damping rib plate.

[0050] In an optional embodiment, the material screening device further comprises a feeding channel connecting pipe, which is fixedly inclined on the top of the discharge barrel, and the lower end of the feeding channel connecting pipe is communicated with the feeding port.

[0051] In particular, in the content of the present application, the above-mentioned "and / or" means that the structure before "and / or" and the structure after "and / or" are arranged simultaneously or alternatively.

[0052] The embodiments of the present application can at least achieve the following beneficial effects:

[0053] In the embodiment, the natural falling of the material along the screen mesh follows a normal distribution structure, which can make a large amount of material to be screened fully arranged on the screen mesh, increase the residence time of small particles in the screening area, and the profile line of the longitudinal section of the screen mesh is a screen mesh curve r(x). The screen mesh curve r(x) adopts a Gaussian curve form in the central area, adopts a cubic polynomial smooth transition in the transition area, ensures the slope continuity with the front and rear areas, and adopts a linear curve in the screen hole area to realize a gentle decline. The smooth surface can reduce the resistance and bouncing of the material flow, make the material distribution more in line with the normal distribution, reduce the local accumulation of the material on the screen mesh 33, and the gentle slope can ensure that the material is fully screened, so that the vibrating screen meets the high-precision screening requirements. When the screen mesh is designed to be rotatable and vibratable, the material screening effect can be further enhanced in combination with centrifugal force and vibration.

[0054] In addition, the embodiment of the present application also provides a plurality of optional implementation manners, and the specific structures and functional effects of these optional implementation manners will be introduced and described in detail in the specific embodiment part of the specification. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the specific embodiment of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0056] Figure 1 The overall structure front view of the vibrating screen optional implementation manner one provided by the embodiment of the present application;

[0057] Figure 2 The A1-A1 cross-sectional view of the vibrating screen optional implementation manner one provided by the embodiment of the present application; Figure 1

[0058] Figure 3 The overall structure isometric view of the vibrating screen optional implementation manner one provided by the embodiment of the present application;

[0059] Figure 4 The overall structure front view of the vibrating screen optional implementation manner two provided by the embodiment of the present application;

[0060] Figure 5 The overall structure isometric view of the vibrating screen optional implementation manner two provided by the embodiment of the present application;

[0061] Figure 6 The overall structure schematic view of the material screening device provided by the present application;

[0062] Figure 7 The partial structure schematic view of the material screening device provided by the present application;​

[0063] Figure 8 for Figure 7 Sectional view along line A2-A2.

[0064] Icons: 1-Frame; 101-Feed channel connector; 102-Motor bracket; 103-Motor 1; 104-Main shaft; 105-Motor 2; 106-Centrifugal block; 107-Connecting component; 108-Inertial vibrator; 109-Drive belt; 110-Drive wheel; 111-Transmission wheel; 112-Spring damping support; 113-Spring; 114-Damping rib;

[0065] 2-Discharge hopper; 201-Outer wall of discharge hopper; 202-Collection port; 21-Support frame;

[0066] 31-Discharge channel connector; 311-Viewing window; 32-Screen cover; 33-Screen mesh; 34-Reinforced flange; 35-Bearing; 36-Reinforcing rib. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0068] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0069] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0070] In the description of this invention, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0071] Furthermore, the terms "horizontal" and "vertical" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0072] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0073] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0074] First aspect

[0075] This embodiment provides a vibrating screen, as shown in the reference. Figures 1 to 5 The vibrating screen includes a screen 33, the surface of which is curved, and the outline of its longitudinal section is the screen curve r(x), where r is the screen radius and x is the radius variable, and the normal distribution function is known. The screen curve r(x) of the screen 33 provided in this embodiment follows a normal distribution function and has the characteristics of a normal distribution function. The screen curve r(x) satisfies the following characteristics:

[0076] a) Satisfies the following in the central region:

[0077] , ;

[0078] Where: R start L is the starting radius of the sieve aperture area. trans H represents the length of the transition region. peak C represents the peak height of the central region. decay The attenuation coefficient of the Gaussian curve;

[0079] b) A cubic polynomial is used for smooth transition in the transition region, ensuring that the slope of the transition region curve is continuous with the slopes of the curves in the preceding and following regions, satisfying the following condition:

[0080]

[0081] Where t is the transition coefficient from 0 to 1, and h prev h is the starting height of the transition region. enxtis the height at the end of the transition region, S slope is the slope of the sieve hole region;

[0082] c) In the sieve hole region, it satisfies:

[0083] , ;

[0084] where, H base is the reference height of the sieve hole region, R end is the ending radius of the sieve hole region.

[0085] In the above design of this embodiment, the natural falling of the material along the sieve mesh 33 follows a normal distribution structure, which can make a large amount of material to be sieved fully arranged on the sieve mesh 33, increase the residence time of small particles in the screening area. The contour line of the longitudinal cross-section of the sieve mesh 33 is the sieve mesh curve r(x). This sieve mesh curve r(x) adopts the form of a Gaussian curve in the central region, and uses a cubic polynomial for smooth transition in the transition region to ensure continuous slope with the front and rear regions. In the sieve hole region, a linear curve is adopted to achieve a gentle decline. The smooth surface can reduce the resistance and bounce of the material flow, make the material distribution more in line with the normal distribution, reduce the local accumulation of the material on the sieve mesh 33, and the gentle slope can ensure that the material is fully sieved, making the vibrating screen meet the requirements of high-precision screening.

[0086] [[ID=2(4]]In an optional implementation manner of this embodiment, it is set that the diameter of the sieve mesh 33 is 3000 mm, and the sieve holes are distributed in the area where the radius r = 1300 mm - 1500 mm on the sieve mesh 33. The screening target is that the material in the non-hole area where r < 1300 mm can quickly slide to the sieve hole area. In the sieve hole area where 1300 mm < r < 1500 mm, the slope should be flat to reduce the material speed and increase the screening penetration time. In the edge area where r = 1500 mm, prevent the material from splashing. Design the sieve mesh curve r(x) according to the quasi-normal distribution function and the given sieve mesh parameters. Specifically, the given parameter values are:

[0087] <(

[0088]

[0089] In an optional implementation manner, referring to Figures 1 to 3 , the edge of the sieve mesh 33 is a curved surface, and the sieve holes are located on this curved surface. The curve function of the sieve mesh curve r(x) is the negative function of the bell-shaped function. Select different peak heights H peak in the central region for design. Numerically simulate the screening efficiency of the curved surface sieve mesh formed under different peak heights H peak parameters. The results are as follows:

[0090]

[0091] Numerical simulation results show that the peak height H in the central region is... peak The sieve passing rate is highest at a thickness of 600 mm, therefore the peak height H in the central region is selected. peak A screen 33 is designed for a curve function with a diameter of 600 mm. The curve function of the screen r(x) satisfies the following characteristics:

[0092] ,

[0093] in: R start L is the starting radius of the sieve aperture area. trans This represents the length of the curve transition region.

[0094] In another alternative implementation, refer to Figure 4 and Figure 5 The edge of screen 33 is a circular plane, and the screen holes are located on this circular plane. The curve function of screen curve r(x) is a bell-shaped function. Different peak heights H in the central region are selected. peak Design was carried out to determine the peak height H in different central areas. peak The screening efficiency of the curved screen formed under the specified parameters was numerically simulated, and the results are as follows:

[0095]

[0096] Numerical simulation results show that the peak height H in the central region is... peak The sieve passing rate is highest at a thickness of 600 mm, therefore the peak height H in the central region is selected. peak A screen 33 is designed for a curve function with a diameter of 600 mm. The curve function of the screen r(x) satisfies the following characteristics:

[0097] .

[0098] In this embodiment, the screen 33 is designed as a rotatable and vibrating structure, which can further enhance the material screening effect. Specifically, refer to... Figures 6 to 8 The vibrating screen provided in this embodiment also includes a feeding channel pipe 31, a screen cover 32, and a reinforcing flange 34; the lower end of the feeding channel pipe 31 is fixedly or integrally connected to the screen cover 32 and passes through the screen cover 32 vertically; the screen cover 32 is placed on top of the screen mesh 33 and its edge is rotatably connected to the edge of the screen mesh 33 in the circumferential direction; the reinforcing flange 34 is fixedly connected to the middle of the screen mesh 33 and is used to be fixedly connected to the main rotating shaft 104 that passes through the feeding channel pipe 31.

[0099] In use, the upper end of the main rotating shaft 104 is connected to an external drive mechanism (such as motor 103) for transmission. Material is added into the upper feed port of the feed channel pipe 31. The material falls from the feed channel pipe 31 onto the screen 33. The material falls naturally along the screen 33 following a normal distribution structure, which allows a large amount of material to be screened to be fully distributed on the screen 33. At the same time, the external drive mechanism drives the main rotating shaft 104 to rotate, which can rotate the screen 33 relative to the screen cover 32. The material to be screened generates a centrifugal effect as the screen 33 rotates, moving from the center to the outside of the screen 33. In addition, the screen 33 with a normal distribution curve structure has a certain depth, which restricts the lateral movement of particles. At high speed, after large particles collide with the screen wall, some bounce back to the central area, while small particles are pushed to the edge by fluid dynamics. The particle size ratio of the material to be screened is much greater than 2. At the same time, small particles are more compact and denser than large particles, and small particles are more likely to coagulate. These conditions increase the tendency of small particles to move outward and are easily carried by the centrifugal flow, thereby improving the material separation efficiency.

[0100] Alternatively, the edge of the screen cover 32 and the edge of the screen 33 are circumferentially connected by a bearing 35, thereby further increasing the separation effect.

[0101] Optionally, reinforcing ribs 36 are provided between the lower outer wall of the feed channel pipe 31 and the upper surface of the screen cover 32, and / or between the reinforcing flange 34 and the surface of the screen 33, which can provide the screen 33 with impact resistance.

[0102] Second aspect

[0103] This embodiment provides a material screening device, which includes a vibrating screen provided in any optional embodiment of the first aspect.

[0104] The specific structure and achievable effects of the vibrating screen in the material screening equipment provided in this embodiment can be obtained by referring to the optional or preferred embodiments in the first aspect.

[0105] Furthermore, the material screening equipment also includes a frame 1, a discharge hopper 2, a motor 103, and a vibrating device. The discharge hopper 2 is installed on the frame 1, with a feed inlet on its top surface and a collection port 202 in the middle of its bottom surface. A motor bracket 102 is fixed on the frame 1, and the motor 103 is installed on the motor bracket 102, with its output end connected to a main rotating shaft 104 extending vertically. The vibrating screen is located inside the discharge hopper 2, and a support frame 21 is fixed to the inner wall of the discharge hopper 2. A discharge channel pipe 31 is fixedly installed on the support frame 21. The main rotating shaft 104 passes through the discharge channel pipe 31 and is fixedly connected to a reinforcing flange 34. The vibrating device is installed on the frame 1, and its vibrating part is connected to the outer wall 201 of the discharge hopper, for driving the discharge hopper 2 to vibrate.

[0106] The working process of this material screening equipment mainly includes three stages: feeding, screening, and discharging.

[0107] During the feeding stage, material is fed into the discharge bucket 2 through the inlet. The material falls naturally along the screen 33 following a normal distribution structure, which allows a large amount of material to be screened to be fully distributed on the screen 33.

[0108] During the screening stage, motor 103 drives the main shaft 104 to rotate, causing the screen 33 to rotate relative to the screen cover 32. The material to be screened experiences a centrifugal effect as the screen 33 rotates, moving from the center outwards along the screen 33. The screen 33, with its near-normal distribution curve structure and depth, restricts lateral particle movement. At high speeds, large particles collide with the screen wall and partially rebound back to the center, while smaller particles are pushed to the edges by fluid dynamics. The particle size ratio of the material to be screened is much greater than 2, and the smaller particles are more compact and denser than the larger particles, making them more prone to cohesion. These conditions increase the outward movement of smaller particles, making them more easily carried by the centrifugal flow, thus improving material separation efficiency. Simultaneously, a vibrating device drives the discharge hopper 2 to vibrate. Particles smaller than the sieve hole size are passed through the sieve holes. When the vibration frequency is 15Hz-25Hz, the mixed particles of different sizes accumulate in the center of the sieve 33. This is combined with the deep normal distribution curve structure formed by the sieve 33 to form an "anti-Brazilian fruit effect". The vibration induces the mixed particles of different sizes to carry out particle convection. The deep curve structure then inhibits the side wall convection. In the actual sieving process, the density of small particles is higher than that of large particles due to surface adsorption. The vibration causes small particles to move to the upper layer and large particles to gather in the lower layer, reducing particle blockage on the sieve 33 and improving the separation efficiency of fine particles. Preferably, but not limited to, the centrifugal speed of motor 103 is 170rpm-190rpm and the vibration frequency of motor 2105 is 15Hz-25Hz.

[0109] During the discharge stage, small particles flow out from the collection port 202 at the bottom of the discharge bucket 2 to be collected, while large particles are accumulated on the screen 33.

[0110] Optionally, a viewing window 311 is provided on the side wall of the discharge channel pipe 31. Correspondingly, the side wall of the discharge barrel 2 is designed to be transparent, or an observation port corresponding to the viewing window 311 is provided on the side wall of the discharge barrel 2. The viewing window 311 and the observation port are covered with a cover plate made of transparent material to avoid material leakage.

[0111] Optionally, in this material screening equipment, the vibration device includes a second motor 105, a centrifugal block 106, a connecting component 107, and an inertial vibrator 108. The input shaft of the inertial vibrator 108 is rigidly connected to the outer wall 201 of the discharge hopper via the connecting component 107. The centrifugal block 106 is rotatably mounted on the input shaft of the inertial vibrator 108. The second motor 105 is mounted on the frame 1 or the outer wall 201 of the discharge hopper, and a drive wheel 110 is mounted on its output shaft. The drive wheel 110 is connected to a transmission wheel 111 via a transmission belt 109. The transmission wheel 111 is coaxially connected to the centrifugal block 106, so that the second motor 105 can drive the centrifugal block 106 to rotate; thereby exciting the inertial vibrator 108 to vibrate.

[0112] In this optional embodiment, the centrifugal block 106 is driven to rotate by the motor 105. The centrifugal force generated by the centrifugal block 106 is used as the excitation source. Combined with the inertial vibrator 108, continuous vibration can be stably excited, making the screening process efficient and stable and improving screening efficiency.

[0113] Optionally, the material screening equipment further includes at least one elastic vibration damping device; each elastic vibration damping device includes a spring vibration damping support 112, a spring 113, and a vibration damping rib 114; the lower end of the spring vibration damping support 112 is fixedly connected to the frame 1; the vibration damping rib 114 is fixedly connected to the outer wall 201 of the discharge hopper; the lower end of the spring 113 is fixedly connected to the spring vibration damping support 112, and the upper end of the spring 113 is fixedly connected to the vibration damping rib 114. In this optional embodiment, by introducing elastic vibration damping devices, vibration energy can be effectively absorbed and buffered, improving the operational stability and reliability of the equipment.

[0114] Optionally, the material screening equipment further includes a feed channel pipe 101, which is inclinedly fixed to the top of the discharge hopper 2, with its lower end connected to the feed inlet. In this optional embodiment, the inclined feed channel pipe 101 helps control the flow rate of the material, avoids material splashing, and reduces blockage and accumulation of material during the feeding process, thereby improving feeding efficiency.

[0115] Finally, it should be noted that:

[0116] 1. In this specification, "and / or" means that the structure before "and / or" and the structure after "and / or" are set simultaneously or selectively;

[0117] 2. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments in this specification are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibrating screen, characterized in that, Includes a screen (33), the surface of which is curved, and the outline of its longitudinal section is the screen curve r(x), where r is the radius of the screen (33) and x is a radius variable. The curve function of the screen curve r(x) satisfies the following characteristics: a) Satisfies the following in the central region: ， ； Where: R start L is the starting radius of the sieve aperture area. trans H represents the length of the transition region. peak C represents the peak height of the central region. decay The attenuation coefficient of the Gaussian curve; b) A cubic polynomial is used for smooth transition in the transition region, ensuring that the slope of the transition region curve is continuous with the slopes of the curves in the preceding and following regions, satisfying the following condition: Where t is the transition coefficient from 0 to 1, and h prev h is the starting height of the transition region. enxt S represents the final height of the transition zone. slope The slope of the sieve aperture area; c) The following condition is satisfied in the sieve aperture region: ， ； Among them, H base R is the reference height for the sieve aperture area. end The radius of the end of the sieve aperture region.

2. The vibrating screen according to claim 1, characterized in that, When the diameter of the screen (33) is 3000 mm, and the screen holes are distributed in an area with a radius r = 1300 mm - 1500 mm on the screen (33), the peak height H in the central area is... peak It is 600mm.

3. The vibrating screen according to claim 2, characterized in that, When the diameter of the screen (33) is 3000 mm, and the screen holes are distributed within a radius r = 1300 mm - 1500 mm, the given parameter values ​​are: The curve function of the screen curve r(x) satisfies any of the following characteristics: d) Satisfies: ， in: R start L is the starting radius of the sieve aperture area. trans The length of the curve transition region; e) Satisfies: 。 4. The vibrating screen according to any one of claims 1-3, characterized in that, The vibrating screen also includes a material discharge channel pipe (31), a screen cover (32), and a reinforcing flange (34). The lower end of the feed channel connector (31) is fixed or integrally connected to the screen cover (32) and passes through the screen cover (32) vertically; the screen cover (32) is placed on top of the screen (33) and its edge is rotatably connected to the edge of the screen (33) in the circumferential direction; the reinforcing flange (34) is fixedly connected to the middle of the screen (33) and is used to be fixedly connected to the main rotating shaft (104) that passes through the feed channel connector (31).

5. The vibrating screen according to claim 4, characterized in that, The edge of the sieve cover (32) and the edge of the sieve mesh (33) are circumferentially connected by a bearing (35).

6. The vibrating screen according to claim 4, characterized in that, A reinforcing rib (36) is provided between the lower outer wall of the feed channel connector (31) and the upper surface of the screen cover (32), and / or between the reinforcing flange (34) and the surface of the screen (33).

7. A material screening device, characterized in that, The vibrating screen according to claim 4 or 5 is characterized in that the material screening equipment further includes a frame (1), a discharge hopper (2), a motor (103) and a vibration device; The discharge hopper (2) is installed on the frame (1), with a feed inlet on its top surface and a collection port (202) in the middle of its bottom surface. The motor (103) is mounted on the frame (1), and its output end is connected to a main shaft (104) extending in the vertical direction. The vibrating screen is located inside the discharge barrel (2), and a support frame (21) is fixed on the inner wall of the discharge barrel (2). The discharge channel pipe (31) is fixedly installed on the support frame (21). The main rotating shaft (104) passes through the discharge channel pipe (31) and is fixedly connected to the reinforcing flange (34). The vibration device is installed on the frame (1) and its vibration part is connected to the outer wall of the discharge barrel (2) to drive the discharge barrel (2) to vibrate.

8. The material screening equipment according to claim 7, characterized in that, The vibration device includes a second motor (105), a centrifugal block (106), a connecting component (107), and an inertial exciter (108). The input shaft of the inertial vibrator (108) is rigidly connected to the outer wall of the discharge bucket (2) through the connecting component (107); The centrifugal block (106) is rotatably mounted on the input shaft of the inertial exciter (108); The second motor (105) is installed on the outer wall of the frame (1) or the discharge hopper (2), and a drive wheel (110) is mounted on its output shaft. The drive wheel (110) is connected to the transmission wheel (111) through the transmission belt (109). The transmission wheel (111) is coaxially connected to the centrifugal block (106) so that the second motor (105) can drive the centrifugal block (106) to rotate; thereby exciting the inertial exciter (108) to generate vibration.

9. The material screening equipment according to claim 7, characterized in that, The material screening equipment also includes at least one elastic vibration damping device; Each of the aforementioned elastic damping devices includes a spring damping support (112), a spring (113), and a damping rib (114). The lower end of the spring damping support (112) is fixedly connected to the frame (1); The vibration damping rib (114) is fixedly connected to the outer wall of the discharge bucket (2); The lower end of the spring (113) is fixedly connected to the spring damping support (112), and the upper end of the spring (113) is fixedly connected to the damping rib (114).

10. The material screening equipment according to claim 7, characterized in that, The material screening equipment also includes a feed channel pipe (101), which is inclinedly fixed to the top of the discharge bucket (2), and its lower end is connected to the feed port.

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