Ultrasonic vibrating screen and control method thereof

Abstract

The invention relates to an ultrasonic vibrating screen and a control method thereof, and relates to the technical field of vibrating screens, the ultrasonic vibrating screen comprises a base, a screen drum arranged on the base and a vibrating device mounted on the screen drum; a screen is arranged in the screen drum, and an inner cavity of the screen drum is divided into an upper screening cavity and a lower screening cavity by the screen; the screen drum is provided with a feeding port, an upper screen opening and a lower screen opening, wherein the feeding port is communicated with the upper screening cavity and allows materials to enter, the upper screen opening is communicated with the upper screening cavity and allows screened materials to leave, and the lower screen opening is communicated with the lower screening cavity and allows screened materials to leave. At least two blocking rings are arranged on the top of the screen in the circumferential direction, notches are formed in the blocking rings, and the notches of the adjacent blocking rings are arranged in a staggered mode. The inner wall of the upper screening cavity is provided with a guiding sheet which is made of metal and used for guiding materials to enter the upper screening opening. The ultrasonic vibrating screen has the effect of improving the screening precision of the ultrasonic vibrating screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vibrating screen, in particular to an ultrasonic vibrating screen and a control method thereof. BACKGROUND

[0002] The ultrasonic vibrating screen is a common classification equipment in the field of powder screening, which realizes the separation of particles according to size by making the material move on the screen through mechanical vibration.

[0003] In the prior art, a screen is installed in the vibrating screen, and when the material is poured into the vibrating screen, the material can fall on the screen. Through the vibration of the vibrating screen, the material of different particle sizes can be screened through the screen and discharged from different discharge ports.

[0004] However, the conventional vibrating screen has certain problems when screening the material. When the material is poured on the screen, due to the short residence time of the material on the screen, part of the particles that are not fully screened may be directly discharged from the discharge port with large particles, resulting in a decrease in screening accuracy, which needs to be improved. SUMMARY

[0005] In order to improve the screening accuracy of the ultrasonic vibrating screen, the present application provides an ultrasonic vibrating screen and a control method thereof.

[0006] In the first aspect, the present application provides an ultrasonic vibrating screen, which adopts the following technical scheme: An ultrasonic vibrating screen, comprising a base, a screen cylinder arranged on the base, and a vibrating device arranged on the screen cylinder; a screen is arranged in the screen cylinder, and the screen divides the inner cavity of the screen cylinder into an upper screening cavity and a lower screening cavity; the screen cylinder has a feeding port in communication with the upper screening cavity and for feeding material, an upper screen port in communication with the upper screening cavity and for discharging screened material, and a lower screen port in communication with the lower screening cavity and for discharging screened material. The top of the screen is provided with at least two rows of blocking rings in the circumferential direction, and the blocking rings are provided with notches, and the notches of adjacent blocking rings are arranged in a staggered manner; the inner wall of the upper screening cavity is provided with a metal guide sheet for guiding the material into the upper screen port.

[0007] By adopting the above technical scheme, when the material enters the screen cylinder, it can first fall into the innermost blocking ring, and then under the vibration of the vibrating screen, the material passes through the notches of each layer of blocking rings in turn, and finally is discharged. By arranging the blocking rings, the vibration time of the material on the screen is prolonged, and the material can be fully screened.

[0008] Optionally, a centrifugal plate is arranged on the inner bottom surface of the lower screening cavity, and a center of the centrifugal plate is upwardly protruded to form a tapered portion; a rotating assembly for driving the centrifugal plate to rotate is arranged between the centrifugal plate and the inner bottom surface of the lower screening cavity, and the rotating assembly comprises an annular track fixed to the inner bottom surface of the lower screening cavity and a roller fixed to a bottom of the centrifugal plate, and the annular track is provided with wedge-shaped grooves at intervals, and the wedge-shaped grooves have inclined rolling surfaces for the roller to roll downward.

[0009] By using the above technical scheme, when the roller of the centrifugal plate is located on the annular track, the roller can roll downward along the inclined rolling surface; and when the vibrating screen vibrates, the roller can jump from one wedge-shaped groove to another adjacent wedge-shaped groove. Since the centrifugal plate has inertia when the roller rolls downward along the inclined rolling surface, the roller can always jump in the same direction, so that the centrifugal plate rotates. Compared with driving rotation by a motor, the above structure does not need to additionally arrange a motor, and solves the problem of motor driving in a vibrating environment.

[0010] Optionally, the inner wall of the lower screening cavity is circumferentially provided with cams, each of the cams has a different angle, and the centrifugal plate is provided with a connecting piece for driving all the cams to synchronously rotate; the screen abuts against a top of the cam, and the inner wall of the upper screening cavity is provided with a pressing assembly for pressing the screen against the cam.

[0011] By using the above technical scheme, when the centrifugal plate rotates, the centrifugal plate drives the cams to synchronously rotate; since each cam has a different angle, when the cam rotates, the screen located on the cam can circumferentially fluctuate, thereby assisting the material on the screen to be screened.

[0012] Optionally, the connecting piece comprises a gear ring and an extension rod connected between the gear ring and the centrifugal plate and extending in a vertical direction; the cam has a gear portion, and the gear portion is engaged with the gear ring.

[0013] Optionally, the connecting piece is circumferentially provided with a limiting groove, and the bottom of the screen has a limiting column telescopically matched with the limiting groove.

[0014] Optionally, the inner bottom surface of the screen cylinder is downwardly recessed to form a vibrating cavity for mounting the vibrating device, and an inner diameter of the vibrating cavity gradually decreases from top to bottom; the vibrating device is located below the centrifugal plate; and the vibrating device has a resonance sheet made of metal.

[0015] By using the above technical scheme, when the vibrating device vibrates, the resonance sheet can resonate with the guide sheet to make the guide sheet vibrate, so as to promote the material in the upper screening cavity to be discharged; and the vibration of the guide sheet can drive the screen to vibrate, so that the material is not easily stuck in the mesh.

[0016] Optionally, a tapered cylinder is arranged on the connecting piece, and an abutting ring is arranged in the tapered cylinder, and the abutting ring has an abutting sheet part abutting against the bottom of the screen.

[0017] By adopting the above technical scheme, the tapered cylinder can amplify the vibration, so that the abutting sheet part can beat the screen.

[0018] In a second aspect, the application provides a control method of an ultrasonic vibrating screen, which adopts the following technical scheme: A control method of an ultrasonic vibrating screen, applied to an ultrasonic vibrating screen, comprising: S1: collecting the feeding weight of the feeding port, the first discharging weight of the upper screen port, and the second discharging weight of the lower screen port in a unit time; S2: calculating the total discharging weight by the first discharging weight and the second discharging weight; S3: when the total discharging weight is inconsistent with the feeding weight, collecting the image information in the cavity; S4: determining whether there is material accumulation based on the image information in the cavity; S5: when there is material accumulation, identifying and determining the material accumulation position based on the image information in the cavity, and discharging the material at the material accumulation position by a preset material accumulation guiding method; S6: when there is no material accumulation, identifying and determining the screen jamming position based on the image information in the cavity, and discharging the material at the screen jamming position by a vibration beating method.

[0019] Optionally, the material accumulation guiding method comprises: S50: determining the target angle of the screen when the material accumulation position and the preset upper screen port position are closest to each other, and collecting the current angle of the screen; S51: determining the vibration duration according to the current angle of the screen and the target angle of the screen; S52: controlling the vibrating screen to continue vibrating to align the material accumulation position with the upper screen port position according to the vibration duration, and determining the accumulation amount of the material accumulation position according to the image information in the cavity; S53: matching the supplementary feeding amount according to the accumulation amount; S54: controlling the feeding port to release the material of the supplementary feeding amount to drive the material at the material accumulation position to bounce towards the upper screen port by the force of the material impacting the screen, and accumulating the feeding weight.

[0020] Optionally, the vibration beating method comprises: S60: determining the beating angle of the screen based on the screen jamming position and the preset guiding sheet position, and collecting the current angle of the screen; S61: determining the vibration duration according to the current angle of the screen and the beating angle of the screen; S62: control the vibrating screen to continue vibrating for a vibration time length to correspondingly guide the sheet position to the screen mesh embedding position, and determine a deviation distance based on the screen mesh embedding position and the guide sheet position; S63: match a vibration amplitude based on the deviation distance; S64: control the guide sheet to rotate 90° to paste the surface of the guide sheet to the surface of the screen mesh, and control the vibrating screen to vibrate for the vibration amplitude to drive the guide sheet to beat the surface of the screen mesh to vibrate the material at the screen mesh embedding position.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: When the material enters the screen cylinder, it can first fall into the innermost layer of the blocking ring, and then under the vibration of the vibrating screen, the material passes through the gap of each layer of the blocking ring in turn, and finally is discharged; by setting the blocking ring, the vibration time of the material on the screen mesh is prolonged, and the material can be fully screened; When the rollers of the centrifugal plate are located on the annular track, the rollers can roll downward along the inclined rolling surface; and when the vibrating screen vibrates, the rollers can jump from one wedge-shaped groove to another adjacent wedge-shaped groove; since the rollers roll downward along the inclined rolling surface, the centrifugal plate has inertia, so that the rollers can always jump in the same direction, thereby making the centrifugal plate rotate, compared with driving rotation by a motor, the above structure does not need to additionally set a motor, solving the problem of motor driving in a vibrating environment; When the vibrating device vibrates, the resonance sheet can resonate with the guide sheet, so that the guide sheet produces shaking, promoting the material in the upper screening cavity to be discharged; and the vibration of the guide sheet can drive the screen mesh to vibrate, so that the material is not easy to be stuck in the mesh hole. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view of the overall structure of an ultrasonic vibrating screen according to an embodiment of the present application; Figure 2 is a sectional view of an ultrasonic vibrating screen according to an embodiment of the present application; Figure 3 is an exploded view of a rotating assembly according to an embodiment of the present application; Figure 4 is a schematic view of a connecting piece according to an embodiment of the present application; Figure 5 is a schematic view of the inner cavity of a screen cylinder according to an embodiment of the present application.

[0023] The names of the parts referred to by the numbers in the above drawings are as follows: 1, base; 2, screen cylinder; 21, feed inlet; 22, upper screen opening; 23, lower screen opening; 24, upper screening cavity; 241, compression assembly; 242, guide sheet; 25, lower screening cavity; 251, cam; 2511, gear part; 26, vibration cavity; 3, vibration device; 31, resonance sheet; 4, shock absorbing spring; 5, screen; 51, limiting column; 52, blocking ring; 53, notch; 6, centrifugal plate; 61, tapered part; 7, rotating assembly; 71, annular track; 711, wedge-shaped groove; 712, inclined rolling surface; 72, roller; 8, connecting piece; 81, gear ring; 811, limiting groove; 82, telescopic rod; 83, tapered cylinder; 84, abutting ring; 841, ring part; 842, abutting sheet part; 85, lifting spring. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0025] The embodiments of the present application disclose an ultrasonic vibration screen.

[0026] Reference Figure 1 and Figure 2 An ultrasonic vibration screen comprises a base 1, a screen cylinder 2 and a vibration device 3. The base 1 is in a cylindrical shape and is supported on the ground. The screen cylinder 2 is installed on the top of the base 1 and is used for classifying and screening materials. Shock absorbing springs 4 are connected circumferentially between the screen cylinder 2 and the base 1. The vibration device 3 is installed on the screen cylinder 2 and is used for vibrating the screen cylinder 2.

[0027] The screen cylinder 2 has a feed inlet 21, an upper screen opening 22 and a lower screen opening 23. The screen cylinder 2 has a screen 5 for classifying and screening materials in the screen cylinder 2, and the screen 5 divides the inner cavity of the screen cylinder 2 into an upper screening cavity 24 and a lower screening cavity 25, with the upper screening cavity 24 being above the lower screening cavity 25. Due to the screening effect of the screen 5, the upper screening cavity 24 is used for screening large-particle materials, and the lower screening cavity 25 is used for screening small-particle materials. The feed inlet 21 is arranged on the top of the upper screening cavity 24 and is used for feeding materials to be screened. The upper screen opening 22 is arranged on the inner wall of the upper screening cavity 24 and is used for discharging large-particle materials that have been screened. The lower screen opening 23 is arranged on the inner wall of the lower screening cavity 25 and is used for discharging small-particle materials that have been screened.

[0028] The inner bottom surface of the lower screening cavity 25 is concave downward to form a vibrating cavity 26, which is in the shape of a circular truncated cone with its inner diameter gradually decreasing from top to bottom. The vibrating device 3 is installed in the vibrating cavity 26, which includes a vibrating motor for generating mechanical vibration and an ultrasonic generator related device for generating ultrasonic waves. The surface of the vibrating device 3 is provided with a resonance sheet 31 made of metal, which can dissipate heat and generate vibration.

[0029] In this embodiment, in order to prevent the material from entering the vibrating cavity 26, the inner bottom surface of the lower screening cavity 25 is provided with a centrifugal plate 6, which can cover the vibrating cavity 26, and the vibrating device 3 is located below the centrifugal plate 6.

[0030] Referring to Figure 2 and Figure 3 , the center of the centrifugal plate 6 is convex upward and has a conical portion 61 in the shape of a circular cone. The centrifugal plate 6 is rotatably installed in the lower screening cavity 25, and a rotating assembly 7 is provided between the centrifugal plate 6 and the inner bottom surface of the lower screening cavity 25. The centrifugal plate 6 can rotate in the lower screening cavity 25 through the rotating assembly 7. When the material falls on the centrifugal plate 6 through screening, the material can slide down the conical portion 61 to the circumference and then be centrifuged out of the lower screen opening 23 during the rotation of the centrifugal plate 6.

[0031] The rotating assembly 7 includes an annular track 71 and a plurality of rollers 72. The annular track 71 is fixedly installed on the inner bottom surface of the lower screening cavity 25 and has an annular shape. The plurality of rollers 72 are fixedly arranged on the bottom of the centrifugal plate 6 in a circumferential direction. The annular track 71 is uniformly and spacedly provided with wedge-shaped grooves 711, which have inclined rolling surfaces 712 inclined downward.

[0032] When the rollers 72 of the centrifugal plate 6 are located on the annular track 71, the rollers 72 can roll downward along the inclined rolling surfaces 712. When the vibrating screen vibrates, the rollers 72 can jump from one wedge-shaped groove 711 to another adjacent wedge-shaped groove 711. Since the centrifugal plate 6 has inertia when the rollers 72 roll downward along the inclined rolling surfaces 712, the rollers 72 can always jump in the same direction, thereby rotating the centrifugal plate 6.

[0033] Referring to Figure 2 and Figure 4 , in this embodiment, the inner wall of the lower screening cavity 25 is circumferentially provided with cams 251, and each cam 251 has a different angle. The screen 5 is located above the cams 251 and can abut against the top of each cam 251. When all the cams 251 rotate synchronously, the screen 5 can be lifted circumferentially under the sequential lifting action of the cams 251.

[0034] And, the screen 5 can rotate synchronously with the centrifugal plate 6, and a connecting piece 8 is arranged between the screen 5 and the centrifugal plate 6. The connecting piece 8 comprises a gear ring 81 and an extension rod 82. The gear ring 81 is an end face gear, and the gear teeth are arranged on the lower end face of the gear ring 81. The extension rod 82 is fixedly connected to the bottom of the gear ring 81, and the extension rod 82 is of an extension structure and can be extended or retracted in the vertical direction under the action of an external force. The lower end of the extension rod 82 is connected to the top of the centrifugal plate 6.

[0035] A limiting groove 811 is arranged in the circumferential direction of the gear ring 81, and the screen 5 is provided with a limiting column 51, the upper end of the limiting column 51 is hingedly connected to the screen 5, and the lower end of the limiting column 51 is in extension-retraction cooperation with the limiting groove 811.

[0036] The cam 251 coaxially has a gear part 2511, the gear part 2511 of the cam 251 is in mesh with the gear ring 81, and the gear part 2511 of all the cams 251 can support the gear ring 81.

[0037] When the centrifugal plate 6 rotates, the gear ring 81 can rotate through the extension rod 82 transmitting torque, thus all the gears can rotate synchronously, and the screen 5 can also rotate synchronously with the gear ring 81 due to the limiting action of the limiting column 51 and the limiting groove 811. Since the extension rod 82 can be extended or retracted, when the centrifugal plate 6 vibrates up and down, the gear ring 81 can stably mesh with the gear part 2511. Since the limiting column 51 can be extended or retracted in the limiting groove 811, when the cam 251 rotates, the screen 5 can be circumferentially up and down.

[0038] Further, in order to prevent the screen 5 from being separated from the top of the cam 251 due to the vibration of the vibrating screen itself, the inner wall of the upper screening cavity 24 is provided with a pressing assembly 241, the pressing assembly 241 comprises a pressing spring, the upper end of the pressing assembly 241 is connected to the inner wall of the upper screening cavity 24, and the lower end of the pressing assembly 241 abuts against the edge of the screen 5, and the screen 5 is pressed against the cam 251 through the pre-tightening force of the pressing assembly 241.

[0039] Referring to Figure 2 and Figure 5 In the embodiment, the inner ring of the gear ring 81 is connected with a tapered cylinder 83, and the inner diameter of the tapered cylinder 83 gradually decreases from top to bottom. The tapered cylinder 83 is rotatably installed with an abutting ring 84, and the abutting ring 84 comprises a ring part 841 and an abutting sheet part 842, the abutting sheet part 842 is a metal sheet and is arranged in the circumferential direction of the ring part 841. The abutting sheet part 842 abuts against the bottom surface of the screen 5.

[0040] The abutting ring 84 and the tapered cylinder 83 are provided with a lifting spring 85, one end of the lifting spring 85 is connected to the tapered cylinder 83, and the other end of the lifting spring 85 is connected to the lower end of the ring part 841, and the lifting spring 85 drives the abutting ring 84 to have a tendency to always abut against the screen 5. When the vibrating screen vibrates, the lifting spring 85 can be compressed or elongated, so that the abutting sheet part 842 can intermittently beat the screen 5.

[0041] Referring to Figure 2 and Figure 5 In this embodiment, the top of the screen 5 is circumferentially provided with at least two rows of blocking rings 52. In this embodiment, the number of rows of the blocking rings 52 is three. The blocking rings 52 are annular, and the circumferential direction of the blocking rings 52 is provided with gaps 53 for the material to pass through. In addition, the gaps 53 of adjacent blocking rings 52 are arranged in a staggered manner.

[0042] When the material enters the screen cylinder 2, it can first fall into the innermost layer of the blocking ring 52, and then under the vibration of the vibrating screen, the material successively passes through the gaps 53 of each layer of the blocking ring 52, and finally is discharged. By arranging the blocking ring 52, the vibration time of the material on the screen 5 is prolonged, and the material can be fully screened.

[0043] Further, the inner wall of the upper screening cavity 24 is rotatably provided with a guide sheet 242 near one side of the upper screen opening 22. The guide sheet 242 is a long sheet body made of metal, and the lower end thereof abuts against the top of the screen 5. When the material reaches the circumferential edge of the screen 5 under vibration, the guide sheet 242 can guide the material into the upper screen opening 22 for discharge.

[0044] Based on the same inventive concept, the present embodiment provides a control method of an ultrasonic vibrating screen. The vibrating screen is fixedly poured with a certain mass of material each time within a unit time, and after the material is screened and discharged, the next wave of screening is continued. After the material is screened, the system analyzes the material discharge condition to determine whether the material is completely discharged.

[0045] A control method of an ultrasonic vibrating screen includes the following steps: Step S1: collecting the feeding weight of the feeding port 21, the first discharge weight of the upper screen opening 22, and the second discharge weight of the lower screen opening 23 within a unit time.

[0046] The feeding weight refers to the weight of the material entering the inner cavity of the screen cylinder 2 from the feeding port 21. In this embodiment, when the material enters the feeding port 21 of the screen cylinder 2, it can first accumulate at the feeding port 21, and then be released into the upper screening cavity 24 after accumulating to a certain weight. A pressure sensor is arranged at the feeding port 21, and the weight of the material can be collected by the pressure sensor.

[0047] The first discharge weight refers to the weight of the material discharged from the upper screen opening 22 within a unit time. The second discharge weight refers to the weight of the material discharged from the lower screen opening 23 within a unit time. The first discharge weight and the second discharge weight can be directly weighed after the material is discharged.

[0048] Step S2: calculating the total discharge weight by the first discharge weight and the second discharge weight.

[0049] The total discharge weight is the sum of the first discharge weight and the second discharge weight, which refers to the total weight of the coarse particle material and the fine particle material after the screening is completed.

[0050] Step S3: When the total discharge weight is inconsistent with the feed weight, image information in the cavity is collected.

[0051] By comparing the total discharge weight and the feed weight, it can be determined whether the material is stuck in the upper screening cavity 24. In this embodiment, it is assumed that the material in the lower screening cavity 25 can be completely discharged through the lower sieve opening 23.

[0052] If the total discharge weight is consistent with the feed weight, it means that the material entering the screen cylinder 2 is completely screened within a certain time and completely discharged from the upper sieve opening 22 and the lower sieve opening 23, and there is no residual material in the screen cylinder 2.

[0053] If the total discharge weight is inconsistent with the feed weight, i.e., the total discharge weight is less than the feed weight, it means that part of the material remains in the screen cylinder 2 after the screening is completed. There can be two cases, one is that the material is stuck in the corner of the blocking ring 52 on the screen 5 and cannot be discharged, and the other is that the material is stuck in the mesh of the screen 5 and cannot be discharged. For the above two cases, targeted processing is needed.

[0054] The cavity image information refers to the image obtained by photographing the upper screening cavity 24 through the camera arranged in the screen cylinder 2, which contains the screen 5 and the material on the screen 5.

[0055] Step S4: Determine whether there is material accumulation based on the cavity image information.

[0056] After the vibrating screen completes the screening action, the image recognition of the screen 5 is performed from the cavity image information to determine whether there is material accumulation on the screen 5 that cannot be discharged.

[0057] Step S5: When there is material accumulation, the material accumulation position is identified based on the cavity image information, and the material at the material accumulation position is discharged by a preset material accumulation guiding method.

[0058] If it is found through image recognition that there is material accumulation, the material accumulation position can be identified from the cavity image information. When the material accumulation position is determined, the system can process the accumulated material by the material accumulation guiding method so that the material can leave the upper sieve opening 22. The material accumulation guiding method is not described here and will be described in detail in subsequent embodiments.

[0059] Step S6: When there is no material accumulation, the screen jamming position is identified based on the cavity image information, and the material at the screen jamming position is discharged by a vibrating and beating method.

[0060] If the image recognition finds that there is no material accumulation, it is the case that the material is jammed in the mesh of the screen 5. For such a case, the system can directly image recognize the screen jamming position from the cavity image information. The screen jamming position refers to the position on the screen 5 where the material is jammed. After determining the screen jamming position, the system can pat the screen 5 by the vibration patting method so that the material at the screen jamming position can be bounced out and discharged. The vibration patting method is not described here and will be described in detail in subsequent embodiments.

[0061] The accumulated material guiding method comprises the following steps: Step S50: determining the target angle of the screen based on the distance between the material accumulation position and the preset upper screen opening position, and collecting the current angle of the screen.

[0062] The upper screen opening position refers to the position of the upper screen opening 22 in the screen cylinder 2, which is a position set when the vibrating screen is designed and will not be described here.

[0063] The target angle of the screen refers to the angle position of the screen 5 when the distance between the material accumulation position and the upper screen opening position is the closest. In this embodiment, the screen 5 can rotate in the screen cylinder 2, and the screen 5 has a scale in the circumferential direction. When the screen 5 rotates, each state of the screen 5 corresponds to an angle position. The target angle of the screen can be determined according to the material accumulation position and the upper screen opening position. During the rotation of the screen 5, the angle of the screen 5 when the distance between the two is the closest is the target angle of the screen.

[0064] The current angle of the screen refers to the real-time angle position of the screen 5 during the operation of the vibrating screen. The current angle of the screen can be obtained by identifying the scale in the circumferential direction of the screen 5 through the camera.

[0065] Step S51: determining the vibration duration according to the current angle of the screen and the target angle of the screen.

[0066] The vibration duration refers to the length of time during which the vibrating screen continues to vibrate during operation.

[0067] After the current angle of the screen and the target angle of the screen are determined, the angle to be rotated of the screen 5 from the current angle of the screen to the target angle of the screen can also be determined. The angle of the screen 5 that can be rotated per unit time is related to the vibration duration, and the two are proportional. The longer the vibration duration, the greater the angle of the screen 5 that can be rotated.

[0068] Step S52: controlling the vibrating screen to continue vibrating for the vibration duration to align the material accumulation position with the upper screen opening position, and determining the accumulation amount of the material accumulation position according to the cavity image information.

[0069] After determining that there is material accumulation on the screen 5, the system controls the vibrating screen to continue vibrating so that the material accumulation position is close to the upper screen opening position.

[0070] The accumulation amount refers to the amount of material accumulation at the material accumulation position. The accumulation amount can be obtained by image recognition and analysis of the material at the material accumulation position from the cavity image information.

[0071] Step S53: matching the supplementary feeding amount according to the accumulation amount.

[0072] The supplementary feeding amount refers to the amount of material continuously poured into the screen cylinder 2 from the feeding port 21. The supplementary feeding amount is directly proportional to the accumulation amount, and the larger the accumulation amount, the more the supplementary feeding amount.

[0073] Step S54: controlling the feeding port 21 to release the material of the supplementary feeding amount to drive the material at the material accumulation position to bounce up to the upper screen opening 22 by the force of the material impacting the screen 5, and accumulate the feeding weight.

[0074] In this embodiment, when there is material accumulation on the screen 5, a certain amount of material is continuously poured from the feeding port 21, and the impact force generated by the material falling on the screen 5 causes the material at the material accumulation position to be bounced up by the screen 5, thereby leaving the material accumulation position.

[0075] Due to the newly poured part of the material, the weight of the material needs to be accumulated in the feeding weight, and the total discharge weight also needs to consider the weight of this part of the material.

[0076] The vibration beating method comprises the following steps: Step S60: determining the screen beating angle based on the screen clamping position and the preset guide sheet position, and collecting the current angle of the screen.

[0077] The guide sheet position refers to the position of the guide sheet 242 set in the upper screening cavity 24, which is a position set during the manufacture of the vibrating screen and will not be described here.

[0078] The screen beating angle refers to the angle position of the screen 5 when the screen clamping position is closest to the guide sheet position. During the rotation of the screen 5, the angle of the screen 5 when the distance between the two is closest is the screen beating angle.

[0079] In this embodiment, the material at the screen clamping position needs to be removed, and the screen beating angle needs to be determined first, and the current angle of the screen needs to be determined. The collection method of the current angle of the screen is consistent with step S50, and will not be described here.

[0080] Step S61: determining the vibration duration according to the current angle of the screen and the screen beating angle.

[0081] After determining the screen current angle and the screen beating angle, the screen 5 is rotated from the screen current angle to the angle that the screen beating angle needs to turn through and can also be determined. Same as step S51, the vibration duration can be determined by rotating the screen 5 from the screen current angle to the angle that the screen beating angle needs to turn through.

[0082] Step S62: controlling the vibrating screen to continue vibrating according to the vibration duration to make the screen mesh embedding position correspond to the guide sheet position, and determining the deviation distance based on the screen mesh embedding position and the guide sheet position.

[0083] When the screen 5 rotates to the screen mesh embedded position corresponding to the guide sheet position, there is still a certain distance between the screen mesh embedded position and the guide sheet 242 in the radial direction, which is the deviation distance. The deviation distance can be determined according to the screen mesh embedded position and the guide sheet position.

[0084] When the image recognizes that material is stuck in the mesh of the screen 5, the system controls the vibrating screen to continue vibrating so that the embedded position of the screen corresponds to the position of the guide sheet.

[0085] Step S63: Matching the vibration amplitude based on the deviation distance.

[0086] Vibration amplitude refers to the vibration parameter of the vibrating screen when it vibrates, which is the amplitude value of the mechanical vibration.

[0087] The vibration amplitude is proportional to the deviation distance. The larger the deviation distance, the greater the vibration amplitude.

[0088] Step S64: Control the guide sheet 242 to rotate 90 degrees to stick its surface to the surface of the screen 5, and control the vibration of the vibrating screen with the vibration amplitude to drive the guide sheet 242 to hit the surface of the screen 5 to vibrate the material stuck in the position of the screen.

[0089] In this embodiment, the system rotates the guide sheet 242 90° via a motor. At this point, the surface of the guide sheet 242 can abut against the screen 5. When the vibrating screen vibrates, the guide sheet 242 can tap the surface of the screen 5, thereby removing the material from the meshes of the screen 5. Furthermore, when the material is stuck in a position that is not within the direct tapping range of the guide sheet 242, the vibration amplitude is increased so that the material at the stuck position is vibrated with the same force as if it were directly tapped by the guide sheet 242.

[0090] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An ultrasonic vibrating screen, characterized in that: The invention comprises a base (1), a screen drum (2) arranged on the base (1), and a vibrating device (3) installed on the screen drum (2); a screen (5) is arranged in the screen drum (2), and the screen (5) divides the inner cavity of the screen drum (2) into an upper screening cavity (24) and a lower screening cavity (25); the screen drum (2) has a feed port (21) connected to the upper screening cavity (24) and for material to enter, an upper screen opening (22) connected to the upper screening cavity (24) and for screened material to exit, and a lower screen opening (23) connected to the lower screening cavity (25) and for screened material to exit. The top of the screen (5) is provided with at least two circumferential blocking rings (52), and each blocking ring (52) is provided with a notch (53), and the notches (53) of adjacent blocking rings (52) are staggered. The inner wall of the upper screening cavity (24) is provided with a guide sheet (242) made of metal material for guiding materials to enter the upper screen opening (22).

2. The ultrasonic vibrating screen according to claim 1, characterized in that: A centrifugal plate (6) is rotatably provided on the inner bottom surface of the lower screening chamber (25), and the center of the centrifugal plate (6) protrudes upward to form a tapered portion (61); a rotating assembly (7) for driving the centrifugal plate (6) to rotate is provided between the centrifugal plate (6) and the inner bottom surface of the lower screening chamber (25), and the rotating assembly (7) comprises an annular track (71) fixed to the inner bottom surface of the lower screening chamber (25) and a roller (72) fixed to the bottom of the centrifugal plate (6), the annular track (71) is spaced apart with wedge-shaped grooves (711), and the wedge-shaped grooves (711) have an inclined rolling surface (712) for the roller (72) to roll downward.

3. The ultrasonic vibrating screen according to claim 2, characterized in that: Cams (251) are circumferentially provided on the inner wall of the lower screening chamber (25), and each cam (251) has a different angle. A connecting member (8) is provided on the centrifugal plate (6) for driving all the cams (251) to rotate synchronously. The screen (5) abuts against the top of the cam (251), and a pressing assembly (241) for pressing the screen (5) against the cam (251) is provided on the inner wall of the upper screening chamber (24).

4. The ultrasonic vibrating screen according to claim 3, characterized in that: The connecting member (8) comprises a gear ring (81) and a telescopic rod (82) connecting the gear ring (81) and the centrifugal plate (6) and telescoping in a vertical direction; the cam (251) comprises a gear portion (2511), and the gear portion (2511) is meshed with the gear ring (81).

5. The ultrasonic vibrating screen according to claim 3, characterized in that: The connecting member (8) is provided with a limiting groove (811) in a circumferential direction, and the bottom of the screen (5) is provided with a limiting column (51) that is telescopically matched with the limiting groove (811).

6. The ultrasonic vibrating screen according to claim 2, characterized in that: The inner bottom surface of the screen drum (2) is recessed downward to form a vibration cavity (26) for installing the vibration device (3), and the inner diameter of the vibration cavity (26) gradually decreases from top to bottom; the vibration device (3) is located below the centrifugal plate (6); and the vibration device (3) has a resonance sheet (31) made of a metal material.

7. The ultrasonic vibrating screen according to claim 3, characterized in that: The connecting member (8) is provided with a conical cylinder (83), and an abutting ring (84) is installed in the conical cylinder (83). The abutting ring (84) has an abutting sheet portion (842) that abuts against the bottom of the screen (5).

8. A control method for an ultrasonic vibrating screen, applied to an ultrasonic vibrating screen according to any one of claims 1 to 7, characterized in that: include: S1: collecting the feed weight of the feed port (21), the first discharge weight of the upper sieve port (22), and the second discharge weight of the lower sieve port (23) within a unit time; S2: Calculate the first discharge weight and the second discharge weight to obtain the total discharge weight; S3: When the total discharge weight is inconsistent with the feed weight, the intracavity image information is collected; S4: determining whether there is material accumulation based on the intracavitary image information; S5: When there is material accumulation, the material accumulation position is determined based on the intracavity image information recognition, and the material at the material accumulation position is discharged using a preset accumulation material guiding method; S6: When there is no material accumulation, the screen mesh embedded position is determined based on the image information recognition in the cavity, and the material at the screen mesh embedded position is discharged by a vibration beating method.

9. The control method of an ultrasonic vibrating screen according to claim 8, characterized in that: Methods of directing accumulated material include: S50: determining the target screen angle when the distance between the material accumulation position and the preset upper screen opening position is the shortest based on the material accumulation position and collecting the current screen angle; S51: Determine the vibration duration according to the current angle of the screen and the target angle of the screen; S52: Controlling the vibrating screen to continue vibrating according to the vibration duration to align the material accumulation position with the upper screen opening position, and determining the accumulation amount of the material accumulation position according to the intracavity image information; S53: Match the replenishment feed amount according to the accumulation amount; S54: Control the feed port (21) to release the supplementary feed amount of material so that the material at the material accumulation position is driven to bounce upward to the screen port (22) through the force of the material hitting the screen (5), and the feed weight is accumulated.

10. The method for controlling an ultrasonic vibrating screen according to claim 8, characterized in that: Vibration tapping methods include: S60: determining the screen beating angle based on the screen mesh embedding position and the preset guide sheet position, and collecting the current angle of the screen mesh; S61: Determine the vibration duration according to the current angle of the screen and the beating angle of the screen; S62: controlling the vibrating screen to continue vibrating according to the vibration duration so as to align the screen mesh embedding position with the guide sheet position, and determining a deviation distance based on the screen mesh embedding position and the guide sheet position; S63: Matching vibration amplitude based on deviation distance; S64: Control the guide sheet (242) to rotate 90 degrees so that its surface is attached to the surface of the screen (5), and control the vibration of the vibrating screen with the vibration amplitude to drive the guide sheet (242) to beat the surface of the screen (5) to vibrate the material in the embedded position of the screen.

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