Ultrasonic-assisted multi-dimensional fine powder material screening device

Abstract

The utility model relates to the technical field of screening devices, in particular to an ultrasonic-assisted multi-dimensional fine powder material screening device. The device is composed of a fine powder material storage device, an ultrasonic-assisted screening device and an ultrasonic generation connecting device. The fine powder material storage device is of an integral welding structure formed by a dust-free feeding inlet bin, a material storage bin and a feeding and discharging device. The ultrasonic auxiliary screening device is composed of a screen box supported by a support and provided with an ultrasonic screen, pneumatic motors arranged at the two ends of a connecting shaft in pairs, the connecting shaft welded to the conical section of the screen box, and an air hammer arranged for preventing materials on the inner surface of the conical section of the screen box from being stacked. The ultrasonic generation connecting device comprises an ultrasonic generator, a converter and a resonance ring, the ultrasonic generator is connected with the converter through a cable, the converter is connected with the resonance ring in a welded mode, and the resonance ring is integrally connected with the screen. The device is quick and convenient to operate, the labor intensity of operators is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to an ultrasonic-assisted multi-dimensional screening device for fine powder materials. Background Art

[0002] Screening is to classify the material particles to be screened according to the size of the particle size through many sieve holes on the screen surface. Screening can exist in many working processes, such as independent screening can be used to process finished materials; pre-screening is usually prepared for the next process; auxiliary screening refers to the working process in which screening is in a secondary operating position; at the same time, screening operations can also be used for dehydration, de-mediation and desludging. Due to the existence of multiple screening methods, the requirements of each screening work are not exactly the same, thus forming a variety of different screening methods, such as ordinary screening method, thin layer screening method, probability screening method, etc. Each screening method has its advantages and disadvantages, and the scope and field of application are also different. In actual operations, you can choose according to actual needs and economic conditions.

[0003] Fine powder material screening devices are widely used in metallurgy, mining, chemical industry, medicine and other industrial fields as one of the main technologies for material particle separation. Fine powder material particle screening is a relatively complicated process. Due to the strong van der Waals force between particles, they have strong adsorption and are easy to bond into agglomerates, thus blocking the sieve holes and making the screening efficiency low.

[0004] The ultrasonic screening system is an important application of power ultrasonic technology. It is simple, reliable, has high screening and filtration accuracy, and can effectively solve the problems of strong adsorption clogging the mesh, high noise pollution, and low screening fineness level. It has become the most effective way to solve the problem of mesh blockage.

[0005] In the production process of composite propellants, oxidizers, ultra-fine aluminum powder and other small components need to be pre-screened as an important step to prevent foreign matter. Due to the problem that fine powder materials less than 10μm cannot be fully automatically screened and the screening efficiency is low, at present, only manual screening and semi-manual screening operation modes can be used before production. This production method has low efficiency, high labor intensity, poor operating environment, and potential safety hazards.

[0006] Patent document CN108355949A proposes a self-priming straight-row screen screening and impurity removal system to reduce labor intensity and dust and ensure screening effect. A vacuum feeder is used to generate negative pressure. Under the action of negative pressure, the material is directly sucked into the vibrating screen through a suction gun for screening. The finished product after passing through the screen is directly pumped into the vacuum feeder, and the slag is discharged through the slag discharge port to complete the screening operation. The equipment achieves the purpose of automatic material extraction, screening and transportation. Patent document CN108543701A proposes a straight-row screen that can quantitatively store screened materials for the prior art straight-row screen that does not store materials quantitatively and does not have shock-absorbing and dust-proof functions. The straight-row screen includes a frame, a dust cover is installed on the top of the frame through a fixing ring, a feed port is arranged on the top of the dust cover, a vibration motor is installed on one side of the frame, a screen is installed at the middle position inside the frame, a first discharge port is arranged on one side of the frame above the screen, a guide hopper is installed on the bottom of the frame through a fixing ring, and a feed port is arranged on the bottom of the guide hopper. There is a second discharge port, legs are installed on both sides of the bottom of the frame through shock-absorbing springs, a storage hopper is installed at the second discharge port through a fixing ring, a weighing sensor is installed at the bottom of the storage hopper, a fixed baffle is installed on the top of the storage hopper, a micro motor is installed inside the storage hopper directly below the fixed baffle, and a closing fan blade is installed at the output end of the micro motor through a rotating shaft, a controller is installed on the surface of the storage hopper, a display screen and a control panel are installed on the surface of the controller, and an adjustment switch is installed on the surface of the control panel. Patent document CN108722855A is aimed at the problems that the fastening bolts of the existing straight-discharge screen are easy to loosen and the dust cover installation efficiency is low. A double vibration screening device for a straight-row screen is proposed, comprising a screen box, a screen mesh is installed inside the screen box, a mounting frame is installed on the top of the screen box, a first fastening thread is arranged on the surface of the mounting frame, mounting plates are welded on both sides of the screen box through connecting blocks, a vibration motor is installed on one side of the mounting plate, a mounting seat is installed on the bottom of the vibration motor, a first through hole is arranged on the surface of the mounting seat and the mounting plate, a fixing block is welded on the other side surface of the mounting plate at the first through hole, a third fastening thread is arranged on the surface of the fixing block, and a second through hole is arranged inside the fixing block, an elastic gasket and a fastening nut are arranged inside the second through hole, and the fastening bolt passes through the first through hole, the fastening nut and the elastic gasket to fasten the mounting seat and the mounting plate, a mounting cover is sleeved on the bottom of the fixing block, a second shock-absorbing spring is installed on the bottom end of the mounting cover, mounting frames are installed on both sides of the mounting plate, and a first shock-absorbing spring is installed on the bottom of one end of the mounting frame.Patent document CN108543700A aims at the problem that the existing straight-row screens cannot screen efficiently and do not have the function of screening fertilizers multiple times, and proposes a straight-row screen for efficient screening, including a mounting shell, a dust cover is installed on the top of the mounting shell, a feed port is arranged on the top of the dust cover, a first screen and a second screen are installed inside the mounting shell, a first discharge pipe is installed on one side surface of the mounting shell at the first screen, a second discharge pipe is installed on one side surface of the mounting shell at the second screen, and one end of the first discharge pipe and the second discharge pipe are both installed on one side of a third discharge pipe, a baffle is arranged inside the third discharge pipe, and a fixing block is installed on one side of the baffle. A vacuum cleaner is installed on the top of the first discharge pipe, the input end of the vacuum cleaner is connected to the third discharge pipe through the first pipe, the output end of the vacuum cleaner is installed with a second pipe, and a second discharge port is arranged at the bottom of the second pipe, a vibration motor is installed on the other side of the installation shell, a guide hopper is installed at the bottom of the installation shell, and a first discharge port is arranged at the bottom of the guide hopper, a base is installed on both sides of the bottom of the installation shell through support rods, a collection trough is arranged on the top of the base, and a handle is arranged on the surface of the collection trough, an observation window is inlaid on the surface of the installation shell, and a control panel is installed on the surface of the installation shell below the observation window, and a control switch is installed on the surface of the control panel.

[0007] The above-mentioned prior art cannot automatically screen fine powder particles, especially fine powder materials (ultra-fine aluminum powder, ammonium perchlorate) with a size of less than 10 μm. Fine powder materials are easily aggregated on the upper end of the screen of the inline screen, blocking the screen holes and reducing the screening efficiency.

[0008] In the solid engine manufacturing industry, all fine powder materials used before product production need to be pre-screened for excess materials. With the increase in production volume, the amount of fine powder materials has also been increasing, especially the amount of 1-2μm ultra-fine aluminum powder (GJB1738A-2015) has been increasing year by year. The screening pretreatment of fine powder materials is a major task. Although mechanical vibration screens, single pendulum straight row screens, rotary vibration screens and other methods have been adopted to reduce the labor intensity of manual screening, there is still the problem that fine powder materials less than 10μm cannot be completely screened and the screening efficiency is low. At present, fine powder materials before production can only be screened manually. This production method has low efficiency, high labor intensity, poor operating environment and safety hazards. However, screening pretreatment of fine powder materials before solid engine production is a necessary step. After screening, it is ensured that the fine powder materials will never contain packaging paper, labels, inclusions and other foreign matter, which provides guarantee for the safety of subsequent processes and product quality. Summary of the invention

[0009] In view of the difficulty and low efficiency of screening fine powder materials, the utility model provides a direct screening device that realizes multi-dimensional movement of the screen with the assistance of ultrasound, and realizes automatic, rapid and safe screening of fine powder materials.

[0010] The utility model provides an ultrasonic-assisted multi-dimensional screening device for fine powder materials, which comprises a fine powder material storage device 1, an ultrasonic-assisted screening device 2, and an ultrasonic generating connection device 3. The fine powder material storage device 1 is connected to the ultrasonic-assisted screening device 2.

[0011] The fine powder material storage device 1 comprises a dust-free feeding inlet bin 101, a material storage bin 103 and a crushing and supplying device 104. The dust-free feeding inlet bin 101 and the material storage bin 103 adopt an integrally welded structure. The crushing and supplying device 104 is located at the bottom of the fine powder material device 1 and is controlled by the opening of the valve and the size of the crushing and supplying power.

[0012] The ultrasonic assisted screening device 2 comprises a screen box 201, an ultrasonic screen 202, an air motor 203, a coupling 204, an air hammer 206 and a bracket 207. The screen box 201 is cylindrical and conical and is divided into two layers by the ultrasonic screen 202. The cylindrical end is the upper screen layer, and the conical section is the lower screen layer. The coupling 204 is welded at the conical section of the screen box 201. The air motor 203 is installed in pairs at both ends of the coupling 204. The screen box 201 is connected to the bracket 207, and the screen box 201 is supported at a certain height from the ground so that the discharge port of the screen box meets the requirements; the air hammer 206 is installed at the unloading position of the conical section of the screen box 201 to prevent material accumulation on the inner surface of the conical section of the screen box;

[0013] The ultrasonic generating and connecting device 3 comprises an ultrasonic generator 301, a converter 302 and a resonance ring 303. The ultrasonic generator 301 is connected to the converter 302 via a cable. The converter 302 is welded to the resonance ring 303. The resonance ring 303 is integrally connected to the screen. The resonance ring 303 applies the high-frequency axial vibration wave converted by the converter 302 to the screen, giving the material an axial vibration force, so that the fine powder material is subjected to radial and axial vibration forces during the screening process, thereby preventing the fine powder material from agglomerating on the screen and clogging the screen.

[0014] Furthermore, the fine powder material storage device 1 also includes a dust removal device 102, and the dust removal device 102 controls the dust concentration in the bin to improve the safety of the fine powder material process.

[0015] Furthermore, the dust-free feeding inlet bin 101 and the material storage bin 103 are both made of stainless steel S304.

[0016] Furthermore, the ultrasonic-assisted screening device 2 further comprises a shock-absorbing spring 205, and the straight end of the screen box 201 is welded to the shock-absorbing spring 205, and the shock-absorbing spring 205 supports the screen box to perform compound rotation vibration.

[0017] Furthermore, the connecting shaft 204 crosses the conical section of the screen box 201 .

[0018] The above one or more technical solutions of the utility model have at least one or more of the following technical effects:

[0019] The utility model device can efficiently work on fine powder materials with a particle size of less than 10μm, and the fine powder materials will not block the screen. The device is quick and easy to operate, reducing the labor intensity of operators and improving production efficiency. Remote control operation increases the safety of the main body, eliminates safety hazards, and lays a solid foundation for efficient screening of large quantities of fine powder materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : Schematic diagram of the device for ultrasonic-assisted screening of fine powder materials;

[0021] Figure 2 : Schematic diagram of the flipping device in direction A;

[0022] Among them: 1-fine powder material storage device, 2-ultrasonic assisted screening device, 3-ultrasonic generating connection device, 101-dust-free feeding bin, 102-dust removal device, 103-material storage bin, 104-breaking and feeding device, 201-screen box, 202-ultrasonic screen, 203-pneumatic motor, 204-coupling shaft, 205-shock-absorbing spring, 206-air hammer, 207-bracket, 301-ultrasonic generator, 302-converter, 303-resonance ring. DETAILED DESCRIPTION

[0023] The utility model provides an ultrasonic multi-dimensional fine powder material screening device, which consists of a fine powder material storage device, an ultrasonic auxiliary screening device and an ultrasonic generating device.

[0024] The fine powder material storage device consists of a dust-free feeding inlet bin, a material storage bin, a dust removal device, and a material feeding and crushing controller. The fine powder material is fed from the feeding bin and then enters the fine powder material storage bin. At the same time, the dust removal device controls the dust in the feeding bin, and the material feeding and crushing controller controls the feeding speed of the fine powder material in the storage bin, which is controlled by the valve opening and the size of the crushing power.

[0025] The ultrasonic assisted in-line screen device consists of a screen box, an ultrasonic screen, a pneumatic motor, a coupling, a shock absorbing spring, a bracket, a steam hammer and a static conductive wire. The screen box is the main container for screening fine powder materials. The ultrasonic screen is placed on the upper end face of the cone section of the screen box and fixed by a clamp. The pneumatic motor is placed at the cone end of the screen box and fixed to the screen box through a bearing, and is placed on the left and right sides of the screen box respectively. After the pneumatic motor is started, it generates high-speed vibration, and a composite inertial force is generated under the action of high-speed vibration. The inertial force forces the vibrating body of the screen box to perform a compound rotation motion. The screen box continuously reciprocates under the action of the vibration force, and then drives the ultrasonic screen surface to perform periodic vibration, so that the fine powder materials on the screen surface move in a directional and active manner with the screen box. An external air hammer is installed on the outer side of the lower end of the cone end of the screen box. The air hammer prevents the accumulation of fine powder materials on the surface of the cone section of the screen box through the vibrating screen box cone section and accelerates the feeding speed of the fine powder materials. The shock-absorbing spring softly connects the screen box and the bracket. Since the screen box will generate high-speed vibration when working, the shock-absorbing spring is used to install the screen box on a bracket with a supporting function.

[0026] The ultrasonic generator connection device consists of an ultrasonic generator, a converter, and a resonance ring. The ultrasonic generator is not directly connected to the inline screen device, but the converter is installed on the resonance ring of the ultrasonic screen and directly connected to the screen box. The high-frequency electrical oscillation generated by the ultrasonic controller is converted into a high-frequency sinusoidal longitudinal oscillation wave by the converter. These oscillation waves are transmitted to the resonance ring to resonate the resonance ring, and then evenly transmitted to the screen surface by the resonance ring, so that the fine powder material on the screen is subjected to low-frequency three-dimensional rotation vibration. Without affecting the overall structure of the vibrating screen, a high-frequency and low-amplitude ultrasonic vibration wave is added to the screen surface. This ultrasonic vibration can weaken the adhesion between the particles of the fine powder material, thereby solving the problems of agglomeration and clogging of the screen holes.

[0027] The control system mainly controls the vibration frequency of the ultrasonic generator and the air volume of the pneumatic motor, thereby controlling the fine powder material.

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0029] as follows Figure 1-2 As shown, the ultrasonic-assisted fine powder material screening device consists of three main parts: a fine powder material storage device 1, an ultrasonic-assisted screening device 2, and an ultrasonic generating and connecting device 3.

[0030] The fine powder material storage device includes a dust-free feeding inlet bin 101, a dust removal device 102, a material storage bin 103, a crushing and feeding device 104 and a control system. The fine powder material enters the material storage bin from the dust-free feeding inlet bin. When the input fine powder material reaches the set material level of the material storage bin, the feeding is stopped and the dust-free feeding bin door is closed; during this process, the dust removal device 102 is turned on to control the dust concentration in the bin to ensure the dust concentration safety range and improve the safety nature of the feeding process; when the fine powder material is discharged, the crushing and feeding device is turned on, and then the fine powder material enters the upper layer of the ultrasonic screen of the screen box through the discharge port for screening. The dust-free feeding inlet bin 101 and the material storage bin 103 adopt an integral welded structure, and the internal welding is uniform, smooth and flat. The dust-free feeding inlet bin 101 and the material storage bin 103 are made of stainless steel (S304).

[0031] The ultrasonic assisted in-line screening device is composed of a screen box 201, an ultrasonic screen 202, an air motor 203, a coupling 204, a shock absorbing spring 205, an air hammer 206, a bracket 207 and a static conductive wire 208. The screen box 201 is cylindrical and conical and is divided into two layers by the ultrasonic screen 202. The cylindrical end is the upper screen layer, and the cone section is the lower screen layer. The ultrasonic screen 2 is connected to the ultrasonic generator. During operation, ultrasonic vibrations will be generated on the screen, forming a multi-dimensional vibration and two vibration modes of complex vibration and rotation vibration for the fine powder material on the screen; one air motor 203 is installed at each end of the coupling 204, with a total of two air motors. The coupling 204 is welded to the screen At the conical section of the screen box 201, the connecting shaft 204 crosses the conical section of the screen box 201. This connection method can drive the screen box 201 to vibrate when the pneumatic motor is working; the screen box 201 is connected to the bracket 207 through the shock-absorbing spring 205, and the straight cylinder end of the screen box 201 is welded to the shock-absorbing spring 205. The shock-absorbing spring 205 supports the screen box to perform compound rotation vibration. At the same time, the screen box 201 and the bracket 207 are connected to each other, and the screen box 201 is supported at a certain height from the ground so that the discharge port of the screen box meets the requirements; the air hammer 206 is installed at the unloading place of the conical section of the screen box 201 to prevent the accumulation of materials on the inner surface of the conical section of the screen box.

[0032] The ultrasonic generating connection device is composed of an ultrasonic generator 301, a converter 302, and a resonance ring 303. The ultrasonic generator 301 is connected to the converter 302 through a cable. The ultrasonic generator converts electrical energy into 38KHz high-frequency ultrasonic waves, and then uses a cable to connect the ultrasonic generator 301 and the converter 302 to convert the ultrasonic waves into high-frequency vibration waves. The converter 302 and the resonance ring 303 are welded together, and the resonance ring 303 is integrally connected to the screen. The resonance ring 303 applies the high-frequency axial vibration waves converted by the converter 302 to the screen, giving the material an axial vibration force, so that the fine powder material is subjected to radial and axial vibration forces during the screening process, thereby avoiding the agglomeration of the fine powder material on the screen and clogging the screen.

[0033] Ultrasonic assisted multi-dimensional screening device for fine powder materials:

[0034] First, the prepared fine powder material is poured from the dust-free feeding bin 101, and the material is stored in the material storage bin 103. When the material reaches the set material level of the material storage bin, the feeding is stopped and the dust-free bin door is closed. During this process, the dust removal device 102 is fully opened to keep the concentration of the fine powder material in the storage bin within a safe range. Then, the crushing and feeding device 104 is opened to allow the fine powder material in the material storage bin 103 to enter the screen box 201, and the pneumatic motor 203 and the ultrasonic generator 301 are started. The high-frequency ultrasonic wave is transmitted to the resonance ring 303 by the converter 302. Finally, the pneumatic motor 203 and the ultrasonic screen 202 vibrate together. Under the action of the vibration force of the pneumatic motor 203 and the ultrasonic screen 202, the fine powder material continuously reciprocates, so that the fine powder material on the screen surface performs multi-dimensional active motion together. During this period, the material smaller than the screen hole diameter falls to the lower layer through the screen hole and becomes the screen under material.

[0035] The utility model is used for screening pretreatment of fine powder materials, such as 1-50 μm ultra-fine aluminum powder, 8-12 μm ammonium perchlorate, etc., and is applied to various products.

[0036] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0037] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An ultrasonic-assisted multi-dimensional screening device for fine powder materials, characterized in that: The device comprises a fine powder material storage device (1), an ultrasonic assisted screening device (2), and an ultrasonic generating connection device (3), wherein the fine powder material storage device (1) is connected to the ultrasonic assisted screening device (2). The fine powder material storage device (1) comprises a dust-free feeding inlet bin (101), a material storage bin (103) and a crushing and supplying device (104); the dust-free feeding inlet bin (101) and the material storage bin (103) are integrally welded structures; the crushing and supplying device (104) is located at the bottom of the fine powder material storage device (1) and is controlled by the opening of a valve and the size of the crushing and supplying power; The ultrasonic assisted screening device (2) comprises a screen box (201), an ultrasonic screen (202), an air motor (203), a coupling (204), an air hammer (206) and a bracket (207); the screen box (201) is cylindrical and conical and is divided into two layers by the ultrasonic screen (202); the cylindrical end is an upper screen layer, and the conical section is a lower screen layer; the coupling (204) is welded to the conical section of the screen box (201); the air motor (203) is installed in pairs at both ends of the coupling (204); the screen box (201) is connected to the bracket (207) to support the screen box (201) at a certain height from the ground so that the discharge port of the screen box meets the requirements; the air hammer (206) is installed at the discharge of the conical section of the screen box (201) to prevent material accumulation on the inner surface of the conical section of the screen box; The ultrasonic generating and connecting device (3) comprises an ultrasonic generator (301), a converter (302) and a resonance ring (303). The ultrasonic generator (301) and the converter (302) are connected via a cable. The converter (302) and the resonance ring (303) are welded together. The resonance ring (303) and the screen are integrally connected. The resonance ring (303) causes the high-frequency axial vibration wave converted by the converter (302) to act on the screen, giving the material an axial vibration force, so that the fine powder material is subjected to radial and axial vibration forces during the screening process, thereby preventing the fine powder material from agglomerating on the screen and clogging the screen.

2. The ultrasonic-assisted multi-dimensional screening device for fine powder materials according to claim 1, characterized in that: The fine powder material storage device (1) further comprises a dust removal device (102), wherein the dust removal device (102) controls the dust concentration in the bin and improves the safety of the fine powder material process.

3. The ultrasonic-assisted multi-dimensional screening device for fine powder materials according to claim 2, characterized in that: The dust-free feeding inlet bin (101) and the material storage bin (103) are both made of stainless steel S304.

4. The ultrasonic-assisted multi-dimensional screening device for fine powder materials according to claim 1, characterized in that: The ultrasonic-assisted screening device (2) further comprises a shock-absorbing spring (205), wherein the shock-absorbing spring (205) is welded to the straight end of the screen box (201), and the shock-absorbing spring (205) supports the screen box to perform complex rotation vibration, and simultaneously connects the screen box (201) and the bracket (207) to each other.

5. The ultrasonic-assisted multi-dimensional screening device for fine powder materials according to claim 1, characterized in that: The coupling shaft (204) crosses the conical section of the screen box (201).

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