Gravel vibrating screen device with ultrasonic wave synergistic auxiliary excitation

Abstract

The utility model discloses a broken stone vibration screening device with ultrasonic waves cooperating with auxiliary excitation, which comprises a rack, a screening box arranged on the rack, a vibration screening motor arranged on the screening box, a screen mesh arranged in the screening box and used for conveying broken stones and performing vibration screening, and an ultrasonic wave transduction component, the left aggregate reflection assembly and the right aggregate reflection assembly are arranged at the bottom of the screen in a bilateral symmetry mode with the center line of the screen as the axis. According to the utility model, the ultrasonic transducer is used for transmitting ultrasonic waves capable of changing the incident direction, and the reflecting cambered surface is matched with the material collecting plate wheel, so that the ultrasonic waves are reflected and focused under the condition that the falling of materials is not influenced, and the auxiliary excitation effect of the ultrasonic waves on the screen is improved.

Description

Technical Field

[0001] The utility model relates to an engineering stone crushing vibrating screen device, in particular to a stone crushing vibrating screen device with ultrasonic coordinated auxiliary excitation. Background Art

[0002] In the field of infrastructure project construction, the use of self-produced flakes for crushing is a common on-site material production and supply method. Since the reserves of self-produced flakes are relatively small compared to large-scale crushing mines and the production mobility is large, the construction investment of the self-produced crushing production line is relatively small and the technical standards are relatively low. In order to reduce production costs, the flake parent materials, production lines, and finished product warehouses used in the self-produced crushing production lines are often stacked in the open air and do not have rainproof drying functions, resulting in a high moisture content in the flake parent materials and crushed stone mixed aggregates. What's more, in order to improve the cleanliness of machine-made sand, some production lines use wet production, which results in a higher moisture content in machine-made sand.

[0003] During the vibration screening process, due to the high moisture content of fine aggregates such as machine-made sand, stone powder, and stone chips, they often aggregate due to surface tension and capillary effect, blocking the sieve holes, so that some fine aggregates that should have passed through the sieve cannot pass through the sieve, and are mixed with 4.75-9.5mm coarse aggregates and directly transported out from the belt conveyor at this level. This leads to:

[0004] (1) The powder content of 4.75-9.5mm coarse aggregate exceeds the standard, the proportion of fine particles increases, and the grading curve is poor, which affects the working performance of concrete.

[0005] (2) The fineness modulus of fine aggregate below 4.75 mm is too coarse and the grading curve is poor, which affects the working performance of concrete.

[0006] (3) The production efficiency is low and the machine needs to be stopped frequently to clean the screen.

[0007] On the other hand, because wet aggregate often blocks the screen, resulting in low screening efficiency and poor screening effect, production line managers often control the mesh size of the smallest screen to 4.5mm, that is, by increasing the mesh size to reduce the probability of wet aggregate blocking. However, although increasing the screen size can reduce the frequency of stopping to clean the screen, it also has the following disadvantages:

[0008] (1) This further leads to an increase in the proportion of coarse particles in fine aggregates below 4.75 mm, a poor grading curve, and poor working performance of fine aggregates.

[0009] (2) The proportion of coarse aggregate particles in the 4.75-9.5 mm range increases, resulting in a poor grading curve and affecting the working performance of concrete.

[0010] At present, similar phenomena exist in the self-produced machine-made sand for construction projects across the country, including some commercial machine-made sand from minerals, which results in the generally coarse fineness modulus of machine-made sand and poor grading curve, which cannot meet the demand for medium sand in Zone II. This further leads to the deterioration of concrete working performance, increased difficulty in adjusting and controlling the mix ratio, increased dosage of cement and other cementitious materials, and higher requirements for admixtures, thereby greatly increasing the cost of concrete use.

[0011] In the process of crushing stone, the blockage of screen holes is caused by many factors. Generally, it is because the shape of the stone is irregular, there are more flaky particles or more critical particles in the mesh, the thickness of the screen wire, the shape of the mesh, the high moisture content of the material, etc., which cause the crushed stone to be stuck in the screen holes and difficult to remove. For this situation, the general cleaning methods include striking method, high-pressure water flushing method and ultrasonic cleaning method.

[0012] Among them, the beating method generally uses a bouncing ball to hit the screen to vibrate the screen, so that the particles stuck in the middle of the screen holes fall off to solve the blockage problem. However, the beating method generally has problems such as complex structure or the beating structure is located below the screen, which blocks the material. At the same time, the bouncing ball requires a sealed space to use, and is generally suitable for light fine vibrating screen equipment such as rotary vibrating screens. Sand and gravel screening generally uses a large linear vibrating screen with an inclined screen. The use of bouncing balls will cause the bouncing balls to gather at the lower end of the screen due to gravity, making it difficult to ensure the cleaning effect on the upper part of the screen.

[0013] High-pressure water cleaning uses the high impact force of high-pressure water flow to remove blockages in the mesh holes. At the same time, the water flow can also remove stains and oxides on the surface of the mesh to restore its original filtering performance. High-pressure water cleaning is more effective for materials with small particles, high humidity, and good viscosity, but it is limited to wet machine sand production operations and is not suitable for dry operations. At the same time, the flushing water contains a large amount of solid suspended particles, and direct discharge will cause a large environmental and water protection problem. Additional sewage treatment measures are required, which increases production costs.

[0014] The ultrasonic cleaning method has the advantages of simple structure and no blocking of materials; however, there are also some disadvantages in the existing ultrasonic cleaning method. For example, Chinese patent (CN205463180U) discloses a dual-frequency screen cleaning vibrating screen, and Chinese patent (CN208288410U) discloses a screening device combining ultrasound and vibration. Both methods proposed are to prevent the material above the screen from clumping to solve the problem of screen blockage. However, since the direction of ultrasonic and vibrating air transmission is parallel to the screen surface, the screen vibration effect is not good, and it is difficult to remove the material blocked in the drying mesh, and the cleaning effect is not good. For another example, Chinese patent (CN220004873U) discloses an ultrasonic vibrating screen that is easy to check the blockage of the screen. It uses ultrasound to vibrate the screen and has a certain anti-blocking effect on the screen, but its fundamental function is to act as an exciter for the screen. On the one hand, the ultrasonic excitation of the screen requires the sound wave to have a higher energy, and the energy consumption is higher, which is not conducive to energy saving and environmental protection; on the other hand, the ultrasonic device as an exciter has little effect on the cleaning of the screen.

[0015] The existing application of ultrasonic cleaning for screen cleaning is to convert 220V, 50Hz or 110V, 60Hz electrical energy into 38kHz high-frequency electrical energy, input it into the ultrasonic transducer, and convert it into 38kHz mechanical vibration, so as to achieve the purpose of efficient screening and cleaning. In addition, there is a reflection phenomenon in sound waves. When ultrasonic waves propagate from one medium to another, a part of the energy is reflected back into the original medium at the interface between the two media, which is called a reflected wave; the change in the sound energy of the reflected wave is closely related to the acoustic impedance of the two media. Assuming that the wave is incident from medium 1 (acoustic impedance Z1) to medium 2 (acoustic impedance Z2), when Z1 is much greater than Z2, the sound pressure (sound intensity) is almost completely reflected, and the transmittance tends to 0, such as the steel-air interface. Sound reflection obeys the law of reflection, which is the same as the principle of light focusing. When the incident sound wave encounters a concave parabola as the reflector, the reflected sound will be concentrated together to form sound focusing. Sound energy is a type of energy that exists in the form of mechanical waves and phonons. The mechanical waves of sound energy are vibration waves. When sound waves propagate in the air, they cause the air to vibrate, causing the substances in the air to move back and forth with the vibration of the air. Utility Model Content

[0016] In view of the above problems, the purpose of the utility model is to provide a stone crushing vibrating screen device with ultrasonic assisted vibration. The utility model utilizes an ultrasonic transducer to emit ultrasonic waves that can change the incident direction, and through the rotation cooperation of the reflective arc surface and the aggregate plate, the ultrasonic waves are reflected and focused without affecting the falling of the materials, thereby improving the auxiliary vibration effect of the ultrasonic waves on the screen.

[0017] The utility model is achieved through the following technical solutions.

[0018] The crushed stone vibrating and screening device with ultrasonic coordinated auxiliary excitation comprises a frame, a screen box arranged on the frame, a vibrating and screening motor arranged on the screen box, and a screen arranged in the screen box for conveying and vibrating the crushed stone. The device is characterized in that it also comprises: an ultrasonic transducer component, a left aggregate reflection component and a right aggregate reflection component symmetrically arranged at the bottom of the screen with the center line of the screen as the axis;

[0019] The ultrasonic transducer assembly includes a plurality of vertical ultrasonic transducers arranged on the top of the screen box and capable of rotating along the length direction of the screen in a plane perpendicular to the screen surface to change the ultrasonic incident direction, and a plurality of horizontal ultrasonic transducers arranged on both sides of the screen box and capable of rotating along the length direction of the screen in a plane parallel to the screen surface to change the ultrasonic incident direction;

[0020] The left aggregate reflection assembly and the right aggregate reflection assembly both include an aggregate reflection bracket fixedly connected to the frame, a rotating shaft with both ends rotatably connected to the aggregate reflection bracket and parallel to the length direction of the screen, a servo motor for driving the rotating shaft to rotate, an aggregate plate connected to one side of the rotating shaft and arranged along the length direction of the screen, and a reflecting arc surface connected to the other side of the rotating shaft and arranged along the length direction of the screen; the reflecting arc surfaces and the aggregate plates on the left and right sides can rotate tangentially around the axis of the rotating shaft under the drive of the driving motor, and the edge lines at both ends of the arc surfaces of the reflecting arc surfaces on the left and right sides are both located on their respective rotating surfaces, and the edge lines at both ends of the aggregate plates on the left and right sides are both located in their respective rotating surfaces, so that the aggregate plates on the left and right sides can be rotated until the two are connected to form an inverted eight-shaped aggregate opening or the reflecting arc surfaces on the left and right sides can be rotated until the two are tangentially connected and the arc surfaces face the screen.

[0021] Preferably, when the collecting plates on the left and right sides are rotated to connect with each other to form an inverted figure eight-shaped collecting opening, the upper opening width of the collecting opening is 1 to 1.1 times the width of the screen.

[0022] Preferably, when the reflective arc surfaces on the left and right sides rotate to be tangentially connected and the arc surfaces face the screen, the center of the common arc surface formed by the reflective arc surface on the left and the reflective arc surface on the right is located on the center line of the screen surface.

[0023] Preferably, the two side walls of the screen box are arc-shaped. When the reflective arc surfaces on the left and right sides are rotated to be tangentially connected and the arc surfaces are facing the screen, the reflective arc surfaces are just connected with the two side walls of the screen box, so that the reflective arc surfaces and the side walls of the screen box together form a continuous arc surface with the center of the circle located on the center line of the screen surface.

[0024] Preferably, the ultrasonic transducer assembly also includes a servo motor fixed to the top of the screen box or the base on both sides of the screen box; the vertical ultrasonic transducer and the horizontal ultrasonic transducer are rotatably connected to the top and the base on both sides of the screen box respectively, and the servo motor is used to drive the vertical ultrasonic transducer and the horizontal ultrasonic transducer to rotate to achieve a change in the incident direction of the ultrasonic wave.

[0025] Preferably, the surface of the reflective arc surface and the top and both sides of the screen box are coated with a mirror or glazed reflective layer.

[0026] Preferably, the aggregate plate is made of a steel plate with a smooth surface.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] 1) The utility model arranges the reflective arc surface and the collecting plate at the bottom of the screen so as to rotate together. Firstly, the ultrasonic waves emitted by each ultrasonic transducer can be reflected by the reflective arc surface and focused again on the screen, which can cause the screen to vibrate twice and improve the effect of the ultrasonic wave on the screen. Secondly, the reflective arc surface and the collecting plate can be driven by a driving motor to rotate, so that the reflective arc surface and the collecting plate on the left and right sides rotate and cooperate, which will not affect the normal leakage of materials, and can change the ultrasonic wave focusing point by driving the reflective arc surface to rotate, so that the ultrasonic wave reflection focus can sweep the screen at a uniform speed and in an orderly manner, so as to achieve comprehensive and uniform cleaning of the screen holes.

[0029] 2) The utility model sets rotatable vertical ultrasonic transducers and horizontal ultrasonic transducers on the top and side walls of the screen box, respectively, so as to change the incident angle of the ultrasonic wave, thereby achieving different effects. Among them, the horizontal ultrasonic transducer and the vertical ultrasonic transducer are controlled to emit ultrasonic waves with an incident angle that is obtuse to the length direction of the screen to act on the gravel material on the screen, and the blocking force of ultrasonic waves on the wet agglomerated materials can be used to prolong the time they stay on the screen surface, thereby ensuring that the wet agglomerated materials can be fully disintegrated to improve the material screening effect; and the horizontal ultrasonic transducer and the vertical ultrasonic transducer are controlled to emit ultrasonic waves with an incident angle perpendicular to the length direction of the screen to act on the screen, and the ultrasonic waves can pass through the curved surface formed by the reflected curved surface of the screen or the inner wall of the screen box and be reflected and focused on the screen, thereby achieving the effect of cleaning the blocked screen holes.

[0030] 3) The utility model can realize three working modes of normal mode, ultrasonic excitation and ultrasonic cleaning by cooperating the ultrasonic transducer component with the left aggregate reflection component and the right aggregate reflection component, so that the appropriate working mode can be selected according to actual needs, thereby improving the practicality of the vibrating screening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0032] Figure 2 for Figure 1 Schematic diagram of the cross section at AA;

[0033] Figure 3 for Figure 2 A schematic diagram of the structure when the middle aggregate plate rotates until the two are connected to form an inverted figure eight shape and the feed inlet points to the aggregate outlet of the screen;

[0034] Figure 4 for Figure 2 Sectional view at the middle BB;

[0035] Figure 5 for Figure 3 Sectional view at CC;

[0036] Figure 6 It is the front view of the utility model;

[0037] Figure 7 : is a working principle diagram of the utility model in the ultrasonic excitation working mode, wherein a is a front view schematic diagram when the incident angle emitted by the vertical ultrasonic transducer is an obtuse angle with the length direction of the screen, and b is a top view schematic diagram when the incident angle emitted by the horizontal ultrasonic transducer is an obtuse angle with the length direction of the screen;

[0038] Figure 8 : is a working principle diagram of the utility model in the ultrasonic cleaning working mode, wherein a is a front view schematic diagram when the incident angle emitted by the vertical ultrasonic transducer is perpendicular to the length direction of the screen, and b is a top view schematic diagram when the incident angle emitted by the horizontal ultrasonic transducer is perpendicular to the length direction of the screen;

[0039] Fig. 9 It is a right view structural schematic diagram of the utility model when the central arc surface and the screen box are enclosed to form a closed space;

[0040] The meanings of the symbols in the above figure are: frame 1, screen box 2, screen 3, vibrating screen motor 4, ultrasonic transducer assembly 5, vertical ultrasonic transducer 501, horizontal ultrasonic transducer 502, left aggregate reflection assembly 6, aggregate reflection bracket 601, aggregate plate 602, reflection arc surface 603, servo motor 604, rotating shaft 605, feed conveyor belt 8, coarse aggregate conveyor belt 9, fine aggregate conveyor belt 10, right aggregate reflection assembly 11, and agglomerated wet material 12. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0044] Example 1

[0045] Ultrasonic vibration-assisted stone screening device, please refer to Figure 1-Figure 6 , comprising a frame 1, a screen box 2 arranged on the frame 1, a vibrating screen motor 4 arranged on the screen box 2, a screen 3 arranged in the screen box 2 for conveying and vibrating crushed stone, an ultrasonic transducer assembly 5, and a left aggregate reflection assembly 6 and a right aggregate reflection assembly 6 symmetrically arranged at the bottom of the screen 3 with the center line of the screen 3 as the axis; in addition, in this embodiment, the screen box inlet of the crushed stone vibrating screen device is connected with a feed conveyor belt 8, a fine aggregate conveyor belt 10 is connected below the screen box, and a coarse aggregate conveyor belt 9 is connected to the coarse aggregate outlet of the screen box;

[0046] The ultrasonic transducer assembly 5 includes a plurality of vertical ultrasonic transducers 501 arranged at the top of the screen box 2 and capable of rotating in a plane perpendicular to the mesh surface of the screen 3 along the length direction of the screen to change the ultrasonic incident direction, and a plurality of horizontal ultrasonic transducers 502 arranged on both sides of the screen box 2 and capable of rotating in a plane parallel to the mesh surface of the screen 3 along the length direction of the screen to change the ultrasonic incident direction; specifically, the plurality of vertical ultrasonic transducers 501 are arranged on the center line of the top of the screen box 2, and one is arranged at intervals of 0.5-1m along the length direction of the screen; the plurality of horizontal ultrasonic transducers 502 are arranged 5-15cm above the mesh surface of the screen 3, and one is arranged at intervals of 0.5-1m along the length direction of the screen, and are staggered with the vertical ultrasonic transducers in the length direction of the screen;

[0047] The left aggregate reflection assembly 6 and the right aggregate reflection assembly 6 both include an aggregate reflection bracket 601 fixedly connected to the frame 1, a rotating shaft 605 rotatably connected to the aggregate reflection bracket 601 at both ends and parallel to the length direction of the screen 3, a servo motor 604 for driving the rotating shaft 605 to rotate, an aggregate plate 602 connected to one side of the rotating shaft 605 and arranged along the length direction of the screen 3, and a reflective arc surface 603 connected to the other side of the rotating shaft 605 and arranged along the length direction of the screen 3; the left and right sides are connected to the aggregate reflection bracket 601, and the rotating shaft 605 is connected to the left and right sides. The reflecting arc surface 603 and the collecting plate 602 on the side can rotate tangentially around the axis of the rotating shaft 605 under the drive of the driving motor 604, and the two end edges of the arc surface of the reflecting arc surface 603 are located on their respective rotating surfaces, and the two end edges of the collecting plate 602 are located in their respective rotating surfaces, so that the collecting plates 602 on the left and right sides can rotate until the two are connected to form an inverted eight-shaped collecting opening 7 or the reflecting arc surfaces 603 on the left and right sides can rotate until the two are tangentially connected and the arc surfaces face the screen 3;

[0048] Based on the above structural settings, the utility model can realize the following three working modes:

[0049] Normal working mode: feed through the feeding conveyor belt 8, start the vibrating screen motor 4, turn off the horizontal ultrasonic transducer 502 and the vertical ultrasonic transducer 501, and drive and control the servo motor to rotate the collection plates 602 on the left and right sides until they are connected to form an inverted eight-shaped shape and the feed port points to the collection port 7 of the screen. At this time, the utility model is in the normal working mode; in the normal working mode, the utility model is the same as the conventional vibrating screen device, which only drives the screen box 2 and the screen 2 to resonate at the same frequency through the vibration generated by the vibrating screen motor 4, so as to screen and transport the crushed stones on the screen 2; the coarse aggregate falls from the coarse aggregate outlet through the screen 2 to the coarse aggregate conveyor belt 9, while the fine aggregate passes through the mesh of the screen 2 and falls below the screen, is guided through the collection port 7, and finally falls on the fine aggregate conveyor belt 10;

[0050] Ultrasonic excitation working mode: feed through the feeding conveyor belt 8, start the vibrating screen motor 4, control the horizontal ultrasonic transducer 502 and the vertical ultrasonic transducer 501 to emit ultrasonic waves with an incident angle that is an obtuse angle with the length direction of the screen to act on the crushed stone materials on the screen, and drive and control the servo motor to rotate the collecting plates 602 on the left and right sides until the two are connected to form an inverted eight-shaped shape and the feeding port points to the collecting port 7 of the screen. At this time, the utility model is in the ultrasonic excitation working mode; wherein, the preferred horizontal ultrasonic transducer 502 and the vertical ultrasonic transducer 501 emit an incident angle that is an obtuse angle of 120-150° with the length direction of the screen; in the ultrasonic excitation working mode, please refer to Figure 7The utility model screens the crushed stone based on the following principles to reduce the risk of clogging the screen holes or grading errors: first, the principle of ultrasonic dehumidification is used to accelerate the evaporation of water in the agglomerated wet materials 12, reduce the cohesive force of the agglomerated wet materials 12, and disintegrate them; second, the principle of ultrasonic resonance is used to make the agglomerated wet materials 12 vibrate and disintegrate; third, when the linear vibrating screen is working, due to the inclination of the screen, the materials on the screen surface will move downward along the screen surface under the action of gravity and vibration, and some larger agglomerated wet materials 12 move faster and stay on the screen surface for a shorter time. The blocking force of ultrasonic waves on the agglomerated wet materials 12 is used to extend the time they stay on the screen surface, thereby ensuring that they can be fully disintegrated to improve the material screening effect; because when the vibrating screen is working, the material to be screened stays on the screen surface, which will hinder the passage and reflection of ultrasonic waves, therefore, the ultrasonic excitation working mode is mainly for dehumidification and vibration of the agglomerated wet materials on the screen surface, which belongs to preventive cleaning and reduces grading and screening errors, but the cleaning effect on the already blocked screen holes is poor;

[0051] Ultrasonic cleaning working mode: stop feeding, start the vibrating screen motor 4, and control the horizontal ultrasonic transducer 502 and the vertical ultrasonic transducer 501 to emit ultrasonic waves with an incident angle perpendicular to the length direction of the screen to act on the screen, and drive the servo motor to control the left and right sides of the reflective arc surface 603 to rotate to a position where the two are tangentially connected and the arc surface faces the screen 3. At this time, the utility model is in the ultrasonic cleaning working mode; in the ultrasonic cleaning working mode, please refer to Figure 8 The utility model can not only utilize the principle of ultrasonic dehumidification to accelerate the evaporation of water in the agglomerated wet material 12 and reduce the cohesive force of the agglomerated material, but also utilize the principle of ultrasonic resonance to cause the agglomerated wet material to vibrate and disintegrate; moreover, at this time, there is no large amount of material stagnating on the screen surface, and the ultrasonic waves emitted by the horizontal ultrasonic transducer 502 and the vertical ultrasonic transducer 501 can pass through the screen and be reflected by the arc surface formed by the reflection arc surface 603 and / or the inner wall of the screen box and focused on the screen, thereby achieving the effect of cleaning the blocked screen holes; in addition, since the ultrasonic waves emitted by the ultrasonic transducer assembly can be focused on a certain area of ​​the screen after being reflected by the reflection arc surface, the reflection arc surfaces on the left and right sides can also be controlled by the servo motor to rotate periodically, so that the reflection focus of the ultrasonic wave can scan the screen at a uniform speed and in an orderly manner, so as to achieve comprehensive and uniform cleaning of the screen holes.

[0052] Further, in a preferred embodiment, see Figure 3 When the collecting plates 602 on the left and right sides rotate to connect to form an inverted eight-shaped collecting opening 7, the upper opening width of the collecting opening 7 is 1 to 1.1 times the width of the screen 3.

[0053] In order to make the ultrasonic wave better focused on the screen after reflection to improve the cleaning effect of the screen, further, in a preferred embodiment, please refer to Figure 2 When the reflection arc surfaces 603 on the left and right sides rotate to be tangentially connected and the arc surfaces face the screen 3, the center of the common arc surface formed by the reflection arc surface 603 on the left and the reflection arc surface 603 on the right is located on the center line of the screen.

[0054] Further, in a preferred embodiment, see Fig. 9 The two side walls of the screen box 2 are arc-shaped. When the reflection arc surfaces 603 on the left and right sides are rotated to be tangent to each other and the arc surfaces are facing the screen 3, the reflection arc surfaces 603 are just connected with the two side walls of the screen box 2, so that the reflection arc surfaces 603 and the side walls of the screen box 2 are jointly enclosed to form a continuous arc surface with the center located on the center line of the screen surface; based on the above structure, the reflection arc surface 603 can be enclosed with the screen box to form a relatively closed space, and at the same time, the ultrasonic wave can be better focused on the screen after reflection, thereby improving the cleaning effect of the screen.

[0055] Furthermore, in a preferred embodiment, the ultrasonic transducer assembly 5 also includes a servo motor, which is fixed to the top of the screen box 2 or the base on both sides of the screen box 2; the vertical ultrasonic transducer 501 and the horizontal ultrasonic transducer 502 are rotatably connected to the bases on the top and both sides of the screen box 2 respectively, and the servo motor is used to drive the vertical ultrasonic transducer 501 and the horizontal ultrasonic transducer 502 to rotate to achieve a change in the incident direction of the ultrasonic wave; the above-mentioned structure for realizing the rotation of the vertical ultrasonic transducer 501 and the horizontal ultrasonic transducer 502 is a prior art, which is similar to the rotation mechanism used by the camera to obtain video images at different orientations or angles, so the corresponding structural diagram is not given in this embodiment.

[0056] Furthermore, in a preferred embodiment, the surface of the reflective arc surface 603 and the top and both sides of the screen box 2 are coated with a mirror or glazed reflective layer to improve the reflection effect of the ultrasonic wave.

[0057] Furthermore, in a preferred embodiment, the aggregate plate 602 is made of a steel plate with a smooth surface.

Claims

1. A crushed stone vibrating screening device with ultrasonic assisted excitation, comprising a frame (1), a screen box (2) arranged on the frame (1), a vibrating screen motor (4) arranged on the screen box (2), and a screen (3) arranged in the screen box (2) for conveying and vibrating crushed stone, characterized in that: Also includes: An ultrasonic transducer assembly (5), a left aggregate reflection assembly (6) and a right aggregate reflection assembly (11) which are symmetrically arranged at the bottom of the screen (3) with the center line of the screen (3) as the axis; The ultrasonic transducer assembly (5) comprises a plurality of vertical ultrasonic transducers (501) arranged at the top of the screen box (2) and capable of rotating in a plane perpendicular to the screen surface of the screen (3) along the length direction of the screen to change the ultrasonic incident direction, and a plurality of horizontal ultrasonic transducers (502) arranged at both sides of the screen box (2) and capable of rotating in a plane parallel to the screen surface of the screen (3) along the length direction of the screen to change the ultrasonic incident direction; The left material collection reflection assembly (6) and the right material collection reflection assembly (11) both comprise a material collection reflection bracket (601) fixedly connected to the frame (1), a rotating shaft (605) rotatably connected to the material collection reflection bracket (601) at both ends and parallel to the length direction of the screen (3), a servo motor (604) for driving the rotating shaft (605) to rotate, a material collection plate (602) connected to one side of the rotating shaft (605) and arranged along the length direction of the screen (3), and a reflecting arc surface (603) connected to the other side of the rotating shaft (605) and arranged along the length direction of the screen (3); left and right The reflective arc surfaces (603) and the material collecting plates (602) on both sides can rotate tangentially around the axis of the rotating shaft (605) under the drive of the driving motor (604), and the two end edges of the arc surfaces of the reflective arc surfaces (603) on the left and right sides are both located on their respective rotating surfaces, and the two end edges of the material collecting plates (602) on the left and right sides are both located in their respective rotating surfaces, so that the material collecting plates (602) on the left and right sides can rotate until the two are connected to form an inverted eight-shaped material collecting opening (7) or the reflective arc surfaces (603) on the left and right sides can rotate until the two are tangentially connected and the arc surfaces face the screen.

2. The ultrasonic-assisted vibration-assisted stone crushing and screening device according to claim 1, characterized in that: When the material collecting plates (602) on the left and right sides rotate until they are connected to form an inverted figure eight-shaped material collecting opening (7), the width of the upper opening of the material collecting opening (7) is 1 to 1.1 times the width of the screen (3).

3. The ultrasonic-assisted vibration-assisted stone crushing and screening device according to claim 1, characterized in that: When the reflection arc surfaces (603) on the left and right sides rotate until they are tangentially connected and the arc surfaces face the screen (3), the center of the common arc surface formed by the reflection arc surface (603) on the left and the reflection arc surface (603) on the right is located on the center line of the screen surface.

4. The ultrasonic-assisted vibration-assisted stone crushing and screening device according to claim 3, characterized in that: The side walls of the screen box (2) are arc-shaped. When the reflection arc surfaces (603) on the left and right sides rotate to be tangentially connected and the arc surfaces face the screen (3), the reflection arc surfaces (603) just connect with the side walls of the screen box (2), so that the reflection arc surfaces (603) and the side walls of the screen box (2) together form a continuous arc surface with the center of the circle located on the center line of the screen surface.

5. The stone crushing and screening device with ultrasonic assisted excitation as claimed in claim 1, characterized in that: The ultrasonic transducer assembly (5) further comprises a servo motor fixed to the top of the screen box (2) or to bases on both sides of the screen box (2); the vertical ultrasonic transducer (501) and the horizontal ultrasonic transducer (502) are rotatably connected to the top and bases on both sides of the screen box (2), respectively; the servo motor is used to drive the vertical ultrasonic transducer (501) and the horizontal ultrasonic transducer (502) to rotate, so as to change the incident direction of the ultrasonic wave.

6. The stone crushing and screening device with ultrasonic assisted excitation as claimed in claim 1, characterized in that: The surface of the reflective arc surface (603) and the top and both sides of the screen box (2) are coated with a mirror or glazed reflective layer.

7. The ultrasonic-assisted vibration-assisted stone crushing and screening device according to claim 1, characterized in that: The aggregate plate (602) is made of a steel plate with a smooth surface.

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