A split-type vacuum electrostatic trace extractor and its application method

A split, electrostatic technology, applied in the field of criminal investigation, can solve the problems of difficult to meet the needs of on-site investigation work, single structure and function, unable to work independently, etc., to enhance portability and practicability, apply to a wide range of objects, improve safety sexual effect

Inactive Publication Date: 2016-03-23
CHINA CRIMINAL POLICE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing product structure and function are single, the vacuum part and the high-voltage static electricity generation part are integrated with the main box, cannot work independently, and are inconvenient to carry.

Method used

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  • A split-type vacuum electrostatic trace extractor and its application method
  • A split-type vacuum electrostatic trace extractor and its application method
  • A split-type vacuum electrostatic trace extractor and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 and 2 As shown, the split-type vacuum static trace extractor includes a power supply module 7, a high-voltage static electricity generation module 8, a vacuum pumping structure, a control module, a powder spraying structure and a casing 3, and the power supply module 7 and the control module are electrically connected , the control module is electrically connected to the high-voltage static electricity generation module 8, the vacuum pumping structure and the powder spraying structure respectively. The control module is composed of the power control switch of each module and the powder spraying switch of the electrostatic powder box. The power control part of each module adopts a light touch switch; the powder spraying switch of the electrostatic powder box is controlled by a solenoid valve 4. When the solenoid valve 4 is opened, the air drawn from the vacuum chamber directly enters the electrostatic powder box through the solenoid valve to blow the el...

Embodiment 2

[0033] The structure of this embodiment is basically the same as that of Embodiment 1, that is, the powder spray box is not used during use. The specific use method is as follows: firstly, the vacuum pump is clamped in the casing, and the vacuum chamber is placed on the On the casing, place the soft object with dust footprints on the vacuum chamber (with the surface of the footprints facing upwards), place the plastic film on the soft objects with dust footprints, and cut off the excess; then, turn on the vacuum pump, Use a vacuum pump to extract the air in the vacuum chamber, thereby forming an air negative pressure zone between the vacuum chamber and the soft object with dust footprints, and between the soft object with dust footprints and the plastic film, so that the plastic film, with dust footprints The soft object and the upper surface of the vacuum chamber are closely adsorbed together, and the air bubbles are removed with cotton balls to smooth the wrinkles on the surf...

Embodiment 3

[0035] Such as image 3 As shown, the split-type vacuum static trace extractor includes a portable vacuum disk, on which a power supply module 12 and a high-voltage static electricity generating module 11 are arranged, the bottom of the portable vacuum disk is a vacuum chamber 13, and the portable vacuum disk is provided with a vacuum chamber 13. There is an air extraction hole on the vacuum disk, the air extraction hole is connected to the vacuum pump through the air extraction pipe, the power supply module 12 is connected to the control module, and the control module is electrically connected to the high-voltage static electricity generating module 11 and the vacuum pump respectively; The generating module 11 is used to convert low-voltage direct current into high-voltage direct current output through high-frequency oscillation, thereby generating continuous direct-current high-voltage static electricity. The lower surface of the vacuum chamber is provided with a sealing rin...

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PUM

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Abstract

The invention relates to a split type vacuum electrostatic imprint extraction device and an application method thereof. The extraction device comprises a power supply module, a high voltage electrostatic generation module and a vacuumizing structure. The power supply module is electrically connected with the high voltage electrostatic generation module and the vacuumizing structure. The high voltage electrostatic generation module is used for converting low voltage direct current power into high voltage direct current power for output via high frequency oscillation, so as to generate continuous direct current high voltage static electricity. The vacuumizing structure includes a vacuum chamber and a vacuum pump connected with the vacuum chamber, and the vacuum pump is connected with a control module. The inventive split type vacuum electrostatic imprint extraction device has diversified functions, and is portable, wide in application range, practical and high in performance-to-price ratio.

Description

technical field [0001] The invention relates to a split-type vacuum electrostatic trace extractor and a use method thereof, which belong to the field of criminal investigation. Background technique [0002] At present, domestic companies have developed electrostatic vacuum writing indentation, fingerprint and other extractors, which can be used for the extraction of dust footprints on paper, the appearance of writing indentations and fingerprints. When in use, put the paper extracted on site on the extractor, cover it with a transparent electrostatic film and apply a vacuum, then apply static electricity to transfer the dust on the paper to the electrostatic film, and use the method of taking pictures with a black background through light to obtain a picture with high contrast and clear details Shoe print photos; or use electrostatic powder to show writing marks and fingerprints after the paper is vacuumed and electrostatically treated; there are similar technologies abroad ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/117A61B5/1172A61B5/1174
Inventor 史力民姚力李泰山汤澄清马越董佳英张翠玲姜吉哲李冀李洪武赵洵
Owner CHINA CRIMINAL POLICE UNIV
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