An ultrasonic excitation based high viscosity fluid pouring device

Abstract

This invention belongs to the field of ultrasonic-assisted feeding technology and discloses a high-viscosity fluid casting device based on ultrasonic excitation. The device includes a frame, a feeding assembly, and an ultrasonic excitation assembly. The feeding assembly includes a hopper fixing plate fixedly installed on one side of the top of the frame, a hopper body installed on the hopper fixing plate, a hopper cover added to the top of the hopper body, and a discharge pipe located at the bottom of the hopper body. The ultrasonic excitation assembly includes an ultrasonic fixing plate fixedly connected to the frame, an ultrasonic amplitude transformer fixedly installed on the ultrasonic fixing plate, an ultrasonic transducer fixedly connected to one end of the ultrasonic amplitude transformer, and an ultrasonic tool head fixedly connected to the other end of the ultrasonic amplitude transformer. An ultrasonic auxiliary nozzle is provided on the discharge pipe and is installed with a gap between it and the ultrasonic tool head. This invention not only facilitates disassembly and maintenance but also reduces the adverse effects of excessive back pressure or excessive vibration frequency. Simultaneously, it utilizes multi-field coupling to achieve ultrasonic vibration transmission, preventing the device from overheating drastically, and is highly practical.

Description

Technical Field

[0001] This invention belongs to the field of ultrasonic-assisted feeding technology, and particularly relates to a high-viscosity fluid casting device based on ultrasonic excitation. Background Technology

[0002] In fields such as biomedicine, ceramics, structural engineering, and electronics, the composite materials used often exhibit extremely high viscosity. This high viscosity generates significant friction with the inner surface of pipes, especially very narrow ones, reducing or even preventing flow. Consequently, when casting specific products, these materials can become clogging nozzles or exhibit uneven flow rates, hindering casting or preventing continuous pouring. Overcoming flow resistance with high extrusion pressure is currently the primary method for ensuring the flow of high-viscosity materials during the feeding process. The main equipment for driving material flow using extrusion pressure includes screw extruders and piston-driven extruders. However, for high-solids-content composites, high pressure can cause separation of binders and solid particles during movement, and the aggregation of solid particles can affect the uniformity of material properties. Due to changes in the geometry of the discharge head channel, high pressure can also lead to localized high tensile stress or large shear deformation in the material. High tensile stress can cause the extruded material to fracture in the discharge head, and large shear deformation poses a safety hazard to shear-sensitive energetic materials. Therefore, using auxiliary equipment for viscosity reduction excitation is gradually becoming an important research direction.

[0003] Ultrasonic technology is a high-tech field based on physics, electronics, mechanics, and materials science, and it has been widely applied in industries such as industry, chemical engineering, medicine, and petrochemicals. When ultrasound acts on high-viscosity fluids, on a microscopic level, high-frequency micro-vibrations can increase the mutual friction between polymer chains, generating viscous heat dissipation, continuously compressing and stretching the polymer melt, and reducing the interaction forces between molecular chains. On a macroscopic level, due to the cavitation effect, the viscosity of the high-viscosity fluid is reduced, increasing the flow characteristics of the material, thereby reducing the probability of pipe blockage in extrusion systems.

[0004] Chinese patent CN112171847A discloses an ultrasonic-assisted 3D printing device for concrete. This device not only increases the dimensional stability and later strength of the concrete material during the printing process, but also improves its rheology and thixotropy, reduces the viscosity of the printing material, and optimizes the printing quality. However, the device is difficult to disassemble and clean, and is prone to material accumulation. The nozzle, as an ultrasonic tool head, is made as a single unit, and the stress concentration is located at the junction of the vertical and horizontal holes, which is prone to cracking and thus cannot function properly. The vibration node is close to the center of the nozzle, which reduces the amplitude amplification, resulting in poor ultrasonic vibration effect, and increases the design difficulty of the amplitude transformer, which is not friendly to the overall structural design. Therefore, there is an urgent need to develop a new type of high-viscosity fluid casting device. Summary of the Invention

[0005] To address the problems in the aforementioned background technology, such as the inconvenience of disassembly and maintenance, easy damage leading to malfunction, poor vibration effect, and difficulty in device design, this invention provides a high-viscosity fluid casting device based on ultrasonic excitation.

[0006] The present invention is achieved by the following technical solution: a high-viscosity fluid casting device based on ultrasonic excitation, comprising a frame, a feeding assembly and an ultrasonic excitation assembly;

[0007] The feeding assembly includes a hopper fixing plate fixedly installed on one side of the top of the frame, a hopper body fixedly installed on the hopper fixing plate, and a discharge pipe disposed at the bottom of the hopper body and vertically penetrating the hopper fixing plate.

[0008] The ultrasonic excitation assembly includes an ultrasonic tool head, an ultrasonic amplitude transformer, and an ultrasonic transducer connected in sequence in the horizontal direction. The ultrasonic tool head has a mounting groove on the end away from the ultrasonic amplitude transformer, and the ultrasonic tool head is connected to the bottom end of the discharge pipe through the mounting groove.

[0009] The ultrasonic excitation assembly also includes an ultrasonic generator mounted on the frame at a vertical distance from the ultrasonic transducer.

[0010] As a further improvement to the above solution, the hopper body is mounted on the hopper fixing plate via a first flange. The first flange of the hopper body and the hopper fixing plate are evenly distributed with a plurality of positioning pin holes, and positioning pins are inserted into the interior of the positioning pin holes.

[0011] As a further improvement to the above solution, the bottom of the hopper body is funnel-shaped, and the outlet at the bottom of the hopper body is connected to the inlet of the discharge pipe; the top of the hopper body has a hopper cover, and the hopper cover is connected to the hopper body through a sealing groove, and a pressure port is opened on the top of the hopper cover.

[0012] As a further improvement to the above solution, an ultrasonic auxiliary nozzle is threadedly connected to the outlet of the discharge pipe. The ultrasonic auxiliary nozzle is installed in the mounting groove, and a gap of 0.5-1mm is left between the outer wall of the ultrasonic auxiliary nozzle and the mounting groove.

[0013] As a further improvement to the above solution, the ultrasonic-assisted nozzle is a stepped tube, the cross-section of the discharge tube is circular, and the discharge tube is a transparent acrylic tube.

[0014] As a further improvement to the above scheme, the ultrasonic amplitude transformer is a half-wavelength longitudinal amplitude transformer, the input end of the ultrasonic amplitude transformer is connected to the ultrasonic transducer, and the output end of the ultrasonic amplitude transformer is connected to the ultrasonic tool head.

[0015] As a further improvement to the above solution, the input end and output end of the ultrasonic amplitude transformer are connected by a flange and a second flange. The flange and the second flange are vertically fixed to the support frame inside the frame by a pair of ultrasonic fixing plates. The middle part of the pair of ultrasonic fixing plates is respectively provided with clamping inner walls and positioning rings for installing and fixing the flange and the flange.

[0016] As a further improvement to the above solution, a weighing device is fixedly installed on the bottom of the frame on one side of the top of the frame, which is vertically opposite to the bottom of the frame.

[0017] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0018] 1. The casting device of the present invention is easy to assemble, maintain, disassemble, and clean, and is inexpensive. During casting, ultrasonic vibration can prevent material blockage, effectively improve casting efficiency, and ensure that the device can continuously and stably discharge material.

[0019] 2. This invention uses the coupling of pressurization at the inlet and ultrasonic excitation parameters for casting, which facilitates the coordination of adverse effects caused by excessive back pressure or excessive vibration frequency, and improves the accuracy of the casting process.

[0020] 3. This invention uses an ultrasonic auxiliary nozzle at the bottom of the discharge port, with the ultrasonic auxiliary nozzle and the ultrasonic tool head installed with a gap, to achieve the transmission of ultrasonic vibration through multi-field coupling, thus avoiding the problem of severe temperature rise caused by direct contact friction affecting the excitation results.

[0021] 4. The casting device of the present invention can also be used for PIV analysis of the velocity field of fluids with different viscosities, and to study the microscopic mechanism of ultrasonic excitation feeding, thus increasing the scope of application.

[0022] 5. The ultrasonic amplitude transformer of the present invention serves as the middle part of the ultrasonic excitation assembly. Its central flange and flange are stabilized by the ultrasonic fixing plate, which further improves the stability of the ultrasonic excitation assembly during the excitation process. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a longitudinal section three-dimensional structural diagram of the feeding component of the present invention.

[0025] Figure 3 This is a longitudinal sectional view of the connection structure of the acrylic tube, ultrasonic auxiliary nozzle, and ultrasonic tool head of the present invention.

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the discharge pipe of the present invention.

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the ultrasonic fixation plate of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Frame; 2. Positioning pin hole; 3. Sealing groove; 4. Pressurization port; 5. Ultrasonic auxiliary nozzle; 6. Gap; 7. Positioning ring; 8. Clamping inner wall; 9. Weighing device; 101. Hopper fixing plate; 102. Hopper body; 103. Hopper cover; 104. Hopper pressure plate; 105. Discharge pipe; 201. A pair of ultrasonic fixing plates; 202. Ultrasonic amplitude transformer; 203. Ultrasonic transducer; 204. Ultrasonic generator; 205. Ultrasonic tool head. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example 1:

[0032] Please combine Figure 1-5 This embodiment provides a high-viscosity fluid casting device based on ultrasonic excitation, suitable for conveying high-viscosity fluids with a viscosity not exceeding 13000 mPa·s, including a frame 1, a feeding assembly, and an ultrasonic excitation assembly.

[0033] The feeding assembly includes a hopper fixing plate 101 fixedly installed on one side of the top of the frame 1, a hopper body 102 fixedly installed on the hopper fixing plate 101, a hopper cover 103 added to the top of the hopper body 102, a hopper pressure plate 104 for fixing the hopper body 102 and the hopper cover 103, and a discharge pipe 105 provided at the bottom of the hopper body 102. The flange of the hopper body 102 and the hopper fixing plate 101 are both provided with corresponding locating pin holes 2 at equal intervals in the circumferential direction. Locating pins are inserted into the locating pin holes 2 to fix the hopper body 102. The bottom of the hopper body 102 has a funnel-shaped structure design. The discharge port at the bottom of the hopper body 102 is connected to the inlet of the discharge pipe 105, which facilitates the rapid entry of materials inside the hopper body 102 into the discharge pipe 105. A sealing groove 3 is provided between the hopper cover 103 and the hopper body 102. A pressure port 4 is provided on the top of the hopper cover 103. The sealing groove 3 can increase the sealing performance of the hopper body 102. The pressure port 4 facilitates the application of pressure to the inside of the hopper body 102. The discharge pipe 105 is a transparent acrylic tube, which facilitates the monitoring of the material discharge. The cross-section of the discharge pipe 105 is circular. A weighing device 9 is fixedly installed on the bottom of the frame 1 vertically on one side of the top of the hopper fixing plate 101.

[0034] The ultrasonic excitation assembly includes an ultrasonic tool head 205, an ultrasonic amplitude transformer 202, and an ultrasonic transducer 203 connected in sequence in the horizontal direction. The ultrasonic tool head 205 has a mounting groove on the end away from the ultrasonic amplitude transformer 202, and the ultrasonic tool head is connected to the bottom end of the discharge pipe 105 through the mounting groove. It also includes an ultrasonic generator 204, which is mounted on the frame 1 at a vertical interval from the ultrasonic transducer 203. The ultrasonic amplitude transformer 202 is a half-wavelength longitudinal amplitude transformer. The input end of the ultrasonic amplitude transformer 202 is connected to the ultrasonic transducer 203, and the output end of the ultrasonic amplitude transformer is connected to the ultrasonic tool head 205. The input end and the output end of the ultrasonic amplitude transformer 202 are connected by a flange and a second flange. The flange and the second flange are vertically fixed to the support frame inside the frame 1 by a pair of ultrasonic fixing plates 201. The middle part of the pair of ultrasonic fixing plates 201 has a clamping inner wall 8 and a positioning ring 7 for installing and fixing the flange and the flange, which facilitates the effective fixing of the ultrasonic amplitude transformer 202.

[0035] An ultrasonic auxiliary nozzle 5 is threadedly connected to the outlet of the discharge pipe 105. The ultrasonic auxiliary nozzle 5 is a stepped pipe. The ultrasonic auxiliary nozzle 5 is installed in the installation groove and a 1mm gap 6 is left between its outer wall and the installation groove. The ultrasonic vibration is transmitted by multi-field coupling, which avoids the impact on the experimental results caused by the severe temperature rise caused by direct contact friction.

[0036] The workflow of this embodiment is as follows:

[0037] Material is added into the hopper body 102 by opening the hopper cover 103. Then, the hopper cover 103 is fixed to the hopper body 102 by the hopper pressure plate 104. Pressure is applied to the inside of the hopper body 102 through the pressure port 4. The reserved sealing groove 3 can play a sealing role to prevent pressure leakage. At the same time, the ultrasonic generator 204 is started. The ultrasonic waves generated by the ultrasonic generator 204 are transmitted to the ultrasonic tool head 205 through the ultrasonic transducer 203 and the ultrasonic amplitude transformer 202. Since there is a gap 6 between the ultrasonic auxiliary nozzle 5 and the mounting groove, the ultrasonic vibration can be transmitted by multi-field coupling. This avoids the problem of severe temperature rise caused by direct contact friction between the outer wall of the ultrasonic auxiliary nozzle 5 and the inner wall of the mounting groove, which would affect the experimental results. After the material inside the ultrasonic auxiliary nozzle 5 is subjected to ultrasonic vibration, it can achieve rapid and stable feeding, ensuring the casting efficiency. Furthermore, the casting is carried out by coupling the pressure at the inlet with the ultrasonic excitation parameters, which facilitates the coordination of adverse effects caused by excessive back pressure or excessive vibration frequency, and improves the accuracy of the experimental results of the device.

[0038] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ultrasonic-actuated high viscosity fluid dispensing device, comprising: Includes the frame, blanking assembly, and ultrasonic excitation assembly; The feeding assembly includes a hopper fixing plate fixedly installed on one side of the top of the frame, a hopper body fixedly installed on the hopper fixing plate, and a discharge pipe disposed at the bottom of the hopper body and vertically penetrating the hopper fixing plate. The ultrasonic excitation assembly includes an ultrasonic tool head, an ultrasonic amplitude transformer, and an ultrasonic transducer connected in sequence in the horizontal direction. The ultrasonic tool head has a mounting groove on the end away from the ultrasonic amplitude transformer, and the ultrasonic tool head is connected to the bottom end of the discharge pipe through the mounting groove. The ultrasonic excitation assembly also includes an ultrasonic generator, which is mounted on the frame at a vertical distance from the ultrasonic transducer. An ultrasonic auxiliary nozzle is threadedly connected to the outlet of the discharge pipe. The ultrasonic auxiliary nozzle is installed in the mounting groove, and a gap of 0.5-1mm is left between the outer wall of the ultrasonic auxiliary nozzle and the mounting groove. The ultrasonic amplitude transformer is a half-wavelength longitudinal amplitude transformer. The input end of the ultrasonic amplitude transformer is connected to the ultrasonic transducer, and the output end of the ultrasonic amplitude transformer is connected to the ultrasonic tool head.

2. A high viscosity fluid pouring device based on ultrasonic excitation according to claim 1, characterized in that, The hopper body is mounted on the hopper fixing plate via a first flange. The first flange of the hopper body and the hopper fixing plate are evenly distributed with a plurality of positioning pin holes, and positioning pins are inserted into the interior of the positioning pin holes.

3. The ultrasonically excited high-viscosity fluid casting device according to claim 1, characterized in that, The bottom of the hopper body is funnel-shaped, and the outlet at the bottom of the hopper body is connected to the inlet of the discharge pipe; the top of the hopper body has a hopper cover, which is connected to the hopper body through a sealing groove, and the top of the hopper cover has a pressure port.

4. The ultrasonically excited high-viscosity fluid casting device according to claim 1, characterized in that, The ultrasonic-assisted nozzle is a stepped tube, the discharge tube has a circular cross-section, and the discharge tube is a transparent acrylic tube.

5. The ultrasonically excited high-viscosity fluid casting device according to claim 4, characterized in that, The input and output ends of the ultrasonic amplitude transformer are connected by a flange and a second flange. The flange and the second flange are vertically fixed to the support frame inside the frame by a pair of ultrasonic fixing plates. The middle part of the pair of ultrasonic fixing plates is respectively provided with clamping inner walls and positioning rings for installing and fixing the flange and the flange.

6. The high-viscosity fluid casting device based on ultrasonic excitation according to claim 1, characterized in that, The weighing device is fixedly installed on the bottom of the frame, which is perpendicular to the top side of the frame, on the hopper fixing plate.

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