An ultrasonic vibrating screen and a control method thereof

Abstract

The application relates to an ultrasonic vibration sieve and a control method thereof, and belongs to the technical field of vibration sieves. The ultrasonic vibration sieve comprises a base, a sieve cylinder arranged on the base, and a vibrating device mounted on the sieve cylinder. A sieve screen is arranged in the sieve cylinder, and the sieve screen divides the inner cavity of the sieve cylinder into an upper screening cavity and a lower screening cavity. The sieve cylinder is provided with a feeding port communicated with the upper screening cavity and used for feeding materials, an upper sieve port communicated with the upper screening cavity and used for discharging screened materials, and a lower sieve port communicated with the lower screening cavity and used for discharging screened materials. The top of the sieve screen is circumferentially provided with at least two rows of blocking rings, and the blocking rings are provided with notches. The notches of adjacent blocking rings are arranged in a staggered mode. The inner wall of the upper screening cavity is provided with a metal guide sheet for guiding the materials to enter the upper sieve port. The application has the effect of improving the screening precision of the ultrasonic vibration sieve.

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:

[0007] 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.

[0008] 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.

[0009] By adopting the above technical scheme, 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 notches of each layer of the blocking ring in turn, and finally is discharged. By arranging the blocking ring, the vibration time of the material on the screen is prolonged, and the material can be fully screened.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] Optionally, the connecting piece comprises a gear ring and an expansion rod connected with the gear ring and the centrifugal plate and vertically extending and retracting; the cam has a gear portion, and the gear portion is engaged with the gear ring.

[0015] 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.

[0016] Optionally, the inner bottom surface of the screen cylinder is downwardly recessed to form a vibrating cavity for mounting the vibrating device, 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.

[0017] 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, thereby promoting 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 less likely to be stuck in the mesh.

[0018] 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.

[0019] By adopting the above technical scheme, the tapered cylinder can amplify the vibration, so that the abutting sheet part can beat the screen.

[0020] In a second aspect, the application provides a control method of an ultrasonic vibrating screen, which adopts the following technical scheme:

[0021] A control method of an ultrasonic vibrating screen, applied to an ultrasonic vibrating screen, comprising:

[0022] 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;

[0023] S2: calculating the total discharging weight by the first discharging weight and the second discharging weight;

[0024] S3: when the total discharging weight is inconsistent with the feeding weight, collecting the image information in the cavity;

[0025] S4: determining whether there is material accumulation based on the image information in the cavity;

[0026] 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;

[0027] 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.

[0028] Optionally, the material accumulation guiding method comprises:

[0029] S50: determining a target angle of the screen when the material accumulation position and the preset upper screen port position are closest to each other based on the material accumulation position and the preset upper screen port position, and collecting the current angle of the screen;

[0030] S51: determining the vibration duration according to the current angle of the screen and the target angle of the screen;

[0031] S52: controlling the vibrating screen to continue vibrating to align the material accumulation position with the upper screen port position by the vibration duration, and determining the accumulation amount of the material accumulation position according to the image information in the cavity;

[0032] S53: matching the supplementary feeding amount according to the accumulation amount;

[0033] 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.

[0034] Optionally, the vibration beating method comprises:

[0035] S60: determining a screen beating angle based on the screen clamping position and the preset guide sheet position, and collecting a current angle of the screen;

[0036] S61: determining a vibration duration according to the current angle of the screen and the screen beating angle;

[0037] S62: controlling the vibration screen to continue vibrating to clamp the screen clamping position to the guide sheet position, and determining a deviation distance based on the screen clamping position and the guide sheet position;

[0038] S63: matching a vibration amplitude based on the deviation distance;

[0039] S64: controlling the guide sheet to rotate 90° to paste a surface of the guide sheet to a surface of the screen, and controlling the vibration screen to vibrate at the vibration amplitude to drive the guide sheet to beat the surface of the screen to vibrate the material at the screen clamping position.

[0040] In summary, the present application comprises at least one of the following beneficial technical effects:

[0041] 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 vibration 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 is prolonged, and the material can be fully screened;

[0042] 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 vibration 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;

[0043] When the vibration device vibrates, the resonance sheet can form resonance 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 to vibrate, so that the material is not easy to be clamped in the mesh. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a whole structure schematic diagram of an ultrasonic vibration screen of an embodiment of the present application;

[0045] Figure 2 is a sectional view of an ultrasonic vibration screen of an embodiment of the present application;

[0046] Figure 3 is an exploded view of a rotating assembly of an embodiment of the present application;

[0047] Figure 4 is a structural schematic view of a connecting piece of an embodiment of the present application;

[0048] Figure 5 is a structural schematic view of an inner cavity of a screen cylinder of an embodiment of the present application.

[0049] The names of the parts referred to by the respective 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 portion; 26, vibration cavity; 3, vibration device; 31, resonant sheet; 4, shock-absorbing spring; 5, screen mesh; 51, limiting post; 52, blocking ring; 53, notch; 6, centrifugal plate; 61, tapered portion; 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 portion; 842, abutting sheet portion; 85, lifting spring. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is 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 do not limit the present application.

[0051] Embodiments of the present application disclose an ultrasonic vibrating screen.

[0052] Referring to Figure 1 and Figure 2 An ultrasonic vibrating screen includes a base 1, a screen cylinder 2, and a vibration device 3. The base 1 is cylindrical and is supported on the ground. The screen cylinder 2 is installed on the top of the base 1 and is used to classify and screen 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 to vibrate the screen cylinder 2.

[0053] The screen cylinder 2 has a feeding port 21, an upper screen port 22 and a lower screen port 23. The screen cylinder 2 has a screen 5 for classifying screening inside, which divides the inner cavity of the screen cylinder 2 into an upper screening cavity 24 and a lower screening cavity 25, the upper screening cavity 24 is above the lower screening cavity 25. Due to the screening effect of the screen 5, the upper screening cavity 24 is used for screening out large-particle materials, and the lower screening cavity 25 is used for screening out small-particle materials. The feeding port 21 is arranged at the top of the upper screening cavity 24, which is used for feeding the materials to be screened. The upper screen port 22 is arranged on the inner wall of the upper screening cavity 24, which is used for discharging the large-particle materials after screening. The lower screen port 23 is arranged on the inner wall of the lower screening cavity 25, which is used for discharging the small-particle materials after screening.

[0054] The inner bottom surface of the lower screening cavity 25 is concave downward to form a vibration cavity 26, which is a circular truncated cone with a gradually decreasing inner diameter from top to bottom. The vibration device 3 is installed in the vibration cavity 26, and the vibration device 3 includes a vibration motor for generating mechanical vibration and an ultrasonic generator related device for generating ultrasonic waves. The surface of the vibration device 3 is provided with a resonance sheet 31, which is made of metal and can generate vibration and heat dissipation.

[0055] In this embodiment, in order to prevent the materials from entering the vibration cavity 26, the inner bottom surface of the lower screening cavity 25 is provided with a centrifugal plate 6, which can cover the vibration cavity 26, and the vibration device 3 is located below the centrifugal plate 6.

[0056] Referring to Figure 2 and Figure 3 , the center of the centrifugal plate 6 is upwardly convex and has a tapered portion 61 which is conical. The centrifugal plate 6 is rotatably installed in the lower screening cavity 25, and a rotating assembly 7 is arranged 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 materials fall on the centrifugal plate 6 through screening, the materials can slide to the circumference under the tapered portion 61, and then be centrifuged to the lower screen port 23 during the rotation of the centrifugal plate 6.

[0057] 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 circumferentially and uniformly fixed to the bottom of the centrifugal plate 6. The annular track 71 is uniformly and spacedly provided with wedge-shaped grooves 711, and the wedge-shaped grooves 711 have inclined rolling surfaces 712 which are inclined downward.

[0058] When the roller 72 of the centrifugal plate 6 is located on the annular track 71, the roller 72 can roll downwards along the inclined rolling surface 712. When the vibrating screen vibrates, the roller 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 roller 72 rolls downwards along the inclined rolling surface 712, the roller 72 can always jump in the same direction, thereby making the centrifugal plate 6 rotate.

[0059] With reference 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 the angles of each cam 251 are different. The screen 5 is located above the cams 251, and the screen 5 can abut against the top of each cam 251. When all the cams 251 rotate synchronously, the screen 5 can be circumferentially undulated under the sequentially lifting action of the cams 251.

[0060] Further, the screen 5 can rotate synchronously with the centrifugal plate 6, and a connecting member 8 is arranged between the screen 5 and the centrifugal plate 6. The connecting member 8 comprises a gear ring 81 and an extension rod 82. The gear ring 81 is an end face gear, and the teeth of the gear ring 81 are located 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 a telescopic structure and can be telescopically 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.

[0061] The gear ring 81 is circumferentially provided with a limiting groove 811, 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 telescopically matched with the limiting groove 811.

[0062] The cam 251 coaxially has a gear portion 2511, the gear portion 2511 of the cam 251 is engaged with the gear ring 81, and the gear portions 2511 of all the cams 251 can support the gear ring 81.

[0063] When the centrifugal plate 6 rotates, the gear ring 81 can rotate through the torque transmitted by the extension rod 82, so that all the gear rings 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 telescopically extended or retracted, the gear ring 81 can stably engage with the gear portion 2511 when the centrifugal plate 6 vibrates up and down. Since the limiting column 51 can be telescopically extended or retracted in the limiting groove 811, the screen 5 can be circumferentially undulated when the cam 251 rotates.

[0064] 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. The screen 5 is pressed against the cam 251 by the pre-tightening force of the pressing assembly 241.

[0065] Referring to Figure 2 and Figure 5 In this 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 abutting ring 84 is rotatably installed in the tapered cylinder 83, and the abutting ring 84 includes a ring part 841 and an abutting sheet part 842, and the abutting sheet part 842 is a metal sheet and is circumferentially arranged on the ring part 841. The abutting sheet part 842 abuts against the bottom surface of the screen 5.

[0066] 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 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.

[0067] Referring to Figure 2 and Figure 5 In this embodiment, the top of the screen 5 circumferentially has at least two rows of blocking rings 52, and in this embodiment, the number of the blocking rings 52 is three. The blocking ring 52 is annular, and the blocking ring 52 is circumferentially provided with a gap 53 for the material to pass through. Moreover, the gaps 53 of adjacent blocking rings 52 are arranged in a staggered manner.

[0068] 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 passes through the gap 53 of each layer of the blocking ring 52 in turn, 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.

[0069] Further, the inner wall of the upper screening cavity 24 close to one side of the upper screen opening 22 is rotatably provided with a guide sheet 242, which is a long strip body made of metal material, 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.

[0070] Based on the same inventive concept, the present embodiment provides a control method of an ultrasonic vibrating screen. The vibrating screen pours a certain mass of material each time in 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.

[0071] A control method of an ultrasonic vibrating screen includes the following steps:

[0072] Step S1: Collect the feeding weight of the feeding opening 21, the first discharge weight of the upper screen opening 22, and the second discharge weight of the lower screen opening 23 in a unit time.

[0073] 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, the material can be accumulated at the feeding port 21 before entering the screen cylinder 2, and then 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.

[0074] The first discharge weight refers to the weight of the material discharged from the upper screen port 22 per unit time. The second discharge weight refers to the weight of the material discharged from the lower screen port 23 per unit time. The first discharge weight and the second discharge weight can be directly measured after the material is discharged.

[0075] Step S2: Calculate the total discharge weight by the first discharge weight and the second discharge weight.

[0076] 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 large particle material and the small particle material after screening.

[0077] Step S3: When the total discharge weight is inconsistent with the feeding weight, collect the cavity image information.

[0078] By comparing the total discharge weight and the feeding 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 screen port 23.

[0079] If the total discharge weight is consistent with the feeding weight, it means that the material entering the screen cylinder 2 is completely screened within a certain time and completely discharged from the upper screen port 22 and the lower screen port 23, and there is no residual material in the screen cylinder 2.

[0080] If the total discharge weight is inconsistent with the feeding weight, i.e., the total discharge weight is less than the feeding weight, it means that part of the material remains in the screen cylinder 2 after screening. 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 treatment is needed.

[0081] The cavity image information refers to the image obtained by photographing the upper screening cavity 24 by the camera arranged in the screen cylinder 2, which contains the screen 5 and the material on the screen 5.

[0082] Step S4: Determine whether there is material accumulation based on the cavity image information.

[0083] After the vibration 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.

[0084] Step S5: When there is material accumulation, determine the material accumulation position based on the image information of the cavity, and discharge the material at the material accumulation position by a preset material accumulation guiding method.

[0085] If it is found through image recognition that there is material accumulation, the material accumulation position can be identified from the image information of the cavity. When the material accumulation position is determined, the system can process the accumulated material by a material accumulation guiding method so that the material can exit from the upper screen opening 22. The material accumulation guiding method is not described here and will be described in detail in subsequent embodiments.

[0086] Step S6: When there is no material accumulation, determine the screen jamming position based on the image information of the cavity, and discharge the material at the screen jamming position by a vibration beating method.

[0087] If image recognition finds that there is no material accumulation, it is a case where the material is jammed in the screen holes of the screen 5. For such a case, the system can directly image recognize the screen jamming position from the image information of the cavity. The screen jamming position refers to the position on the screen 5 where the material is jammed. When the screen jamming position is determined, the system can beat the screen 5 by a vibration beating method so that the material at the screen jamming position can be bounced out and discharged. The vibration beating method is not described here and will be described in detail in subsequent embodiments.

[0088] The material accumulation guiding method includes the following steps:

[0089] Step S50: Determine the target angle of the screen when the distance between the material accumulation position and the preset position of the upper screen opening is the shortest, and collect the current angle of the screen.

[0090] The position of the upper screen opening 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.

[0091] 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 position of the upper screen opening is the shortest. 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 position of the upper screen opening. During the rotation of the screen 5, the angle of the screen 5 when the distance between the two is the shortest is the target angle of the screen.

[0092] 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 recognizing the scale in the circumferential direction of the screen 5 through the camera.

[0093] Step S51: Determine the vibration duration according to the current angle of the screen and the target angle of the screen.

[0094] The vibration duration refers to the length of time during which the vibrating screen continues to vibrate when the vibrating screen is running.

[0095] After the current angle of the screen cloth and the target angle of the screen cloth are determined, the angle to be turned of the screen cloth 5 from the current angle of the screen cloth to the target angle of the screen cloth can also be determined. The angle that the screen cloth 5 can be turned in a unit of time is related to the vibration duration, and the two are directly proportional. The longer the vibration duration, the greater the angle that the screen cloth 5 can be turned.

[0096] Step S52: Control the vibrating screen to continue vibrating with the vibration duration to make the material accumulation position correspond to the upper screen opening position, and determine the accumulation amount of the material accumulation position according to the image information in the cavity.

[0097] After it is determined that there is material accumulation on the screen cloth 5, the system controls the vibrating screen to continue vibrating, so that the material accumulation position is close to the upper screen opening position.

[0098] 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 image information in the cavity.

[0099] Step S53: Match the supplementary feeding amount according to the accumulation amount.

[0100] The supplementary feeding amount refers to the amount of material that continues to be poured into the screen cylinder 2 from the feeding port 21. The supplementary feeding amount is directly proportional to the accumulation amount. The greater the accumulation amount, the more the supplementary feeding amount.

[0101] Step S54: Control the feeding port 21 to release the supplementary feeding amount of material to drive the material at the material accumulation position to bounce towards the upper screen opening 22 by the force of the material impacting the screen cloth 5, and accumulate the feeding weight.

[0102] In this embodiment, when there is material accumulation on the screen cloth 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 cloth 5 makes the material at the material accumulation position bounce off the screen cloth 5, so as to leave the material accumulation position.

[0103] Since a part of the material is newly poured, 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.

[0104] The vibration beating method comprises the following steps:

[0105] Step S60: Determine the screen cloth beating angle based on the screen cloth clamping position and the preset guide sheet position, and collect the current angle of the screen cloth.

[0106] The guide sheet position refers to the position of the guide sheet 242 set in the upper screening cavity 24. This position is set when the vibrating screen is manufactured, and will not be described here.

[0107] The screen beating angle refers to an angle position of the screen 5 when the screen clamping position and the guide sheet position are closest.

[0108] 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.

[0109] Step S61: determining the vibration duration according to the current angle of the screen and the screen beating angle.

[0110] After the current angle of the screen and the screen beating angle are determined, the angle that the screen 5 needs to rotate from the current angle of the screen to the screen beating angle can also be determined. The same as step S51, the vibration duration can be determined by the angle that the screen 5 needs to rotate from the current angle of the screen to the screen beating angle.

[0111] Step S62: controlling the vibrating screen to continue vibrating to make the screen clamping position correspond to the guide sheet position, and determining the deviation distance based on the screen clamping position and the guide sheet position.

[0112] When the screen 5 rotates to the screen clamping position corresponding to the guide sheet position, there is still a certain distance between the screen clamping 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 clamping position and the guide sheet position.

[0113] When the image identifies that the screen 5 is clamped with material in the mesh, the system controls the vibrating screen to continue vibrating, so that the screen clamping position corresponds to the guide sheet position.

[0114] Step S63: matching the vibration amplitude based on the deviation distance.

[0115] The vibration amplitude refers to the vibration parameter of the vibrating screen when vibrating, which is the amplitude value of mechanical vibration.

[0116] The vibration amplitude is proportional to the deviation distance, and the greater the deviation distance, the greater the vibration amplitude.

[0117] Step S64: controlling the guide sheet 242 to rotate 90° to paste its surface on the surface of the screen 5, and controlling the vibrating screen to vibrate at the vibration amplitude to drive the guide sheet 242 to beat the surface of the screen 5 to vibrate the material at the screen clamping position.

[0118] In the embodiment, the system rotates the guide sheet 242 by 90° through the motor, at which time the surface of the guide sheet 242 can abut against the screen 5, and when the vibrating screen vibrates, the guide sheet 242 can pat the surface of the screen 5, thereby removing the material in the mesh of the screen 5. Moreover, when the material jamming position is not within the range directly patting by the guide sheet 242, the vibration amplitude is increased, so that the material at the material jamming position is subjected to the same force as that directly patting by the guide sheet 242.

[0119] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiment. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. An ultrasonic vibrating screen, characterized in that, The application relates to a vibrating screen, which comprises a base (1), a screen cylinder (2) arranged on the base (1) and a vibrating device (3) arranged on the screen cylinder (2); a screen mesh (5) is arranged in the screen cylinder (2), and the screen mesh (5) divides the inner cavity of the screen cylinder (2) into an upper screening cavity (24) and a lower screening cavity (25); the screen cylinder (2) is provided with a feeding port (21) communicated with the upper screening cavity (24) and used for feeding materials, an upper screen port (22) communicated with the upper screening cavity (24) and used for discharging screened materials and a lower screen port (23) communicated with the lower screening cavity (25) and used for discharging screened materials; The screen mesh (5) is provided with at least two rows of blocking rings (52) in the circumferential direction at the top, the blocking rings (52) are provided with notches (53), and the notches (53) of adjacent blocking rings (52) are arranged in a staggered mode; the inner wall of the upper screening cavity (24) is provided with a metal guide sheet (242) for guiding the materials to enter the upper screen port (22); A centrifugal plate (6) is arranged on the inner bottom surface of the lower screening cavity (25) in a rotating mode, the center of the centrifugal plate (6) is upwardly protruded to form a conical part (61); a rotating assembly (7) for driving the centrifugal plate (6) to rotate is arranged between the centrifugal plate (6) and the inner bottom surface of the lower screening cavity (25), the rotating assembly (7) comprises an annular track (71) fixed to the inner bottom surface of the lower screening cavity (25) and a roller (72) fixed to the bottom of the centrifugal plate (6), the annular track (71) is provided with wedge-shaped grooves (711) at intervals, and the wedge-shaped grooves (711) have inclined rolling surfaces (712) for downward rolling of the roller (72).

2. An ultrasonic vibrating screen according to claim 1, wherein The inner wall of the lower screening cavity (25) is provided with cams (251) in the circumferential direction, the angles of the cams (251) are different, the centrifugal plate (6) is provided with a connecting piece (8) for driving all the cams (251) to synchronously rotate, the screen mesh (5) abuts against the top of the cam (251), and the inner wall of the upper screening cavity (24) is provided with a pressing assembly (241) for pressing the screen mesh (5) against the cam (251).

3. An ultrasonic vibrating screen according to claim 2, wherein, The connecting piece (8) comprises a gear ring (81) and a telescopic rod (82) connecting the gear ring (81) and the centrifugal plate (6) and stretching and contracting in the vertical direction; the cam (251) has a gear part (2511) engaged with the gear ring (81).

4. An ultrasonic vibrating screen according to claim 2, wherein, The connecting piece (8) is provided with a limiting groove (811) in the circumferential direction, and the screen mesh (5) is provided with a limiting column (51) telescopically matched with the limiting groove (811).

5. An ultrasonic vibrating screen according to claim 1, wherein The inner bottom surface of the screen cylinder (2) is downwardly recessed to form a vibrating cavity (26) for mounting the vibrating device (3), the inner diameter of the vibrating cavity (26) gradually decreases from top to bottom, the vibrating device (3) is located below the centrifugal plate (6), and the vibrating device (3) is provided with a metal resonance sheet (31).

6. An ultrasonic vibrating screen according to claim 2, wherein, The connecting piece (8) is provided with a tapered cylinder (83), and an abutting ring (84) is installed in the tapered cylinder (83), and the abutting ring (84) has an abutting flake part (842) abutting with the bottom of the screen (5).

7. A control method of an ultrasonic vibrating screen, applied to an ultrasonic vibrating screen according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1: collecting the feeding weight of the feeding port (21), the first discharging weight of the upper screen port (22), and the second discharging weight of the lower screen port (23) 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 accumulated material 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 and beating method.

8. A control method of an ultrasonic vibrating screen according to claim 7, characterized in that, The accumulated material 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 make the material accumulation position correspond to the upper screen port position by 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 (21) to release the material of the supplementary feeding amount to drive the material at the material accumulation position to bounce to the upper screen port (22) by the force of the material impacting the screen (5), and accumulating the feeding weight.

9. A method of controlling an ultrasonic vibrating screen according to claim 7, characterized in that, The vibration and beating method comprises: S60: determining the beating angle of the screen based on the screen jamming position and the preset guiding flake 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: controlling the vibrating screen to continue vibrating to make the screen jamming position correspond to the guiding flake position by the vibration duration, and determining the deviation distance based on the screen jamming position and the guiding flake position; S63: matching the vibration amplitude based on the deviation distance; S64: controlling the guiding flake (242) to rotate by 90° to make its surface adhere to the surface of the screen (5), and controlling the vibrating screen to vibrate by the vibration amplitude to drive the guiding flake (242) to beat the surface of the screen (5) to vibrate the material at the screen jamming position.

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