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CN-118253472-B - Piezoelectric crystal ceramic shock wave generating element

CN118253472BCN 118253472 BCN118253472 BCN 118253472BCN-118253472-B

Abstract

The invention discloses a piezoelectric crystal ceramic shock wave generating element, which comprises a cable groove, wherein the cable groove is fixedly connected to the side wall of a container, the inner end of the cable groove extends into the container to be provided with a concave spherical body, a plurality of piezoelectric crystal blocks are arranged at the inner side of the concave spherical body, wires are arranged in the cable groove, the piezoelectric crystal blocks are connected to a high-energy capacitor through the wires, the high-energy capacitor is arranged at the outer end of the cable groove, the high-energy capacitor is connected to a power supply, the piezoelectric crystal blocks collect energy to a focus, and a protective limiting film is coated from the outer side of the cable groove to the outer side of the concave spherical body. The invention introduces shock waves to act on the melt, carries out the sequence purification operation of degassing, impurity removal and deslagging of the melt, and cleans and structurally repairs the defects of the melt in the mesoscopic-microstructure.

Inventors

  • CHE YUN
  • MEN SANQUAN
  • LI XIANG
  • CAO YUEQING

Assignees

  • 贵州华科铝材料工程技术研究有限公司

Dates

Publication Date
20260505
Application Date
20221227

Claims (3)

  1. 1. A piezoelectric crystal ceramic shock wave generating element is characterized by comprising a concave spherical body (5) arranged in a melt body and a plurality of piezoelectric crystal blocks (6) arranged on the inner side of the concave spherical body (5), wherein the piezoelectric crystal blocks (6) are connected to a high-energy capacitor (4), the high-energy capacitor (4) is connected to a power supply, the piezoelectric crystal blocks (6) gather energy to a focus, the piezoelectric crystal blocks (6) are shock wave generating sources made of ceramic crystal materials capable of bearing the ambient temperature of the melt body and keeping piezoelectric characteristics, the middle parts of the piezoelectric crystal blocks (6) are rotationally connected with the concave spherical body (5) through connecting rods (7) by adopting universal bearings (8), electric telescopic rods (9) are respectively arranged on two sides of each connecting rod (7) to connect the piezoelectric crystal blocks (6), and the electric telescopic rods (9) are connected with a controller.
  2. 2. The piezoelectric crystal ceramic shock wave generating element according to claim 1, further comprising a cable groove (1), wherein the cable groove (1) is fixedly connected to the side wall of the container, the inner end of the cable groove extends into the container to be provided with a concave spherical body (5), a wire (3) is arranged in the cable groove (1), the piezoelectric crystal block (6) is connected to the high-energy capacitor (4) through the wire, the high-energy capacitor (4) is arranged at the outer end of the cable groove (1), and a protective limiting film (2) is wrapped from the outer side of the cable groove (1) to the outer side of the concave spherical body.
  3. 3. The piezoelectric ceramic shock wave generating element according to claim 2, wherein the protective boundary film is made of a high-temperature melt corrosion resistant film and is made of an elastic material with a single layer thickness of less than 0.02 mm.

Description

Piezoelectric crystal ceramic shock wave generating element Technical Field The invention belongs to the technical field of shock wave generating devices, and particularly relates to a piezoelectric crystal ceramic shock wave generating element which is used for casting. Background The shock wave is a mechanical wave with sound, light and mechanical properties, and can expand and gather in the medium so as to change the density of the medium, and is mainly applied to medical diagnosis and treatment at present. In practical engineering applications, the metal preparation process almost always goes through solidification process, including ingot and casting, in which the composition, morphology, distribution, nucleation and selective growth of crystals, and the number of segregation, cracks, pores, shrinkage cavities, porosity and inclusions, which are thermodynamic processes of growth of structural particles of materials from microscopic (atomic size, about 0.1nm and below) to mesogenic size (material structural unit size, about 0.1nm to 1 mm), which process and its attendant defects have a decisive influence on the performance of the formed solid material. Since the particle composition and defect structure of the solid material are difficult to change once solidified, although the particle composition and defect structure of the solid material can be adjusted to a certain extent by heat treatment and deformation processing by applying external force, the defects cannot be eliminated from the meaning and statistical meaning of the physical phase structure system, and if the control of the defects is considered from the point of view of eradication, the process link to the melt with the flowable particle structure must be traced back. The gas phase, inclusions and slag contained in the melt all contribute to the propensity for casting defects during solidification of the crystal. Therefore, in industrial production, a "triple removal" operation is performed prior to casting to clean the melt, which operation is also called "refining" or "purging" of the melt. The prior technical scheme of 'three-removal' of aluminum alloy melt is generally realized through the operation process of 'refining-purifying', and is characterized in that reactants of objects to be eliminated are introduced first, and then the reacted products are directly discharged out of the melt through gas phase, or are discharged out of the melt after adsorption filtration of solid-phase particles. The introduced reactants are mostly toxic (such as halide, chlorine, freon and fluorochlorohydrocarbon), the reaction products are in a gaseous state or a solid state, the environment is adversely affected, the ozone layer is destroyed by the discharge of the gaseous products, and the treatment and degradation of the solid waste become more and more serious environmental protection problems. In order to reduce defects such as melt crystallization delamination and segregation during casting as much as possible, scientific researchers and engineers have conducted a great deal of research, developed and applied technical means such as mechanical stirring, electromagnetic stirring, current pulse, electromagnetic oscillation, mechanical oscillation and the like, and the generation of defects is relieved to a certain extent, but the problems cannot be fundamentally solved, the problems of internal and external delamination and macroscopic stress staggered lamination distribution of large-scale blank water-cooling crystallization still exist, and the problems of casting parts with complicated shapes due to uneven cooling still cannot be properly solved. In summary, the "triple-quadrupling" technology for the solidification process of the melt has not achieved the first control in theory and practice, i.e. the effect of directly regulating and controlling the synchronous phase change of a large number of particle particles at the crystallization interface by using macroscopic skills, enabling the crystallization behavior to be randomly interfered according to the needs, and distinguishing the melt from impurities (gas and impurity residues) so as to effectively separate them, i.e. no top-layer design scheme capable of achieving these objectives has been provided. The applicant thus devised a shock wave generating device for casting by "treating" defects in the green melt in combination with the characteristics of the shock wave, and purifying the melt without introducing other substances. Disclosure of Invention The invention aims to provide a piezoelectric crystal ceramic shock wave generating element which provides high-level energy for melt solidification and crystallization, and achieves the purposes of melt purification, solidification process optimization, solidification phase homogenization and crystallization grain refinement. The technical scheme includes that the piezoelectric crystal ceramic shock wave generating element comprises a concave spher