Split type vacuum electrostatic imprint extraction device and application method thereof

A split-type, electrostatic technology, applied in the field of criminal investigation, can solve the problems that it is difficult to meet the needs of on-site investigation work, the structure and function are single, and cannot work independently, so as to enhance portability and practicability, apply to a wide range of objects, and improve safety. sexual effect

Inactive Publication Date: 2013-01-02
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 elect

Method used

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  • Split type vacuum electrostatic imprint extraction device and application method thereof
  • Split type vacuum electrostatic imprint extraction device and application method thereof
  • Split type vacuum electrostatic imprint extraction device and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] Such as figure 1 and 2 As shown, the split vacuum static electricity trace extraction instrument includes a power supply module 7, a high-voltage static electricity generation module 8, a vacuum structure, a control module, a powder spray structure, and a casing 3. The power supply module 7 and the control module are electrically connected , The control module is electrically connected to the high-voltage static electricity generating module 8, the vacuum structure and the powder spraying structure. 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 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, blowing the electros...

Example Embodiment

[0035] Example 2

[0036] The structure of this embodiment is basically the same as that of embodiment 1, that is, when in use, no powder spray box is needed. The specific method of use is: first, the vacuum pump is clamped in the casing, and the vacuum chamber is placed at the same time. On the casing, place the soft object with dust footprint on the vacuum chamber (where the surface of the footprint remains), and place the plastic film on the soft object with dust footprint, cut off the excess part; then turn on the vacuum pump, Use a vacuum pump to extract the air in the vacuum chamber to form a negative air pressure zone between the vacuum chamber and the soft object with dust footprint, and between the soft object with dust footprint and the plastic film, so that the plastic film has a dust footprint The soft object is tightly attached to the upper surface of the vacuum chamber. Use cotton balls to remove air bubbles and smooth the wrinkles on the surface of the film. Finall...

Example Embodiment

[0037] Example 3

[0038] Such as image 3 As shown, the split vacuum static trace extractor includes a portable vacuum tray on which a power supply module 12 and a high-voltage static electricity generation module 11 are arranged, and the bottom of the portable vacuum tray is a vacuum chamber 13. The vacuum plate has an air extraction hole, the air extraction hole is connected to a vacuum pump through an air extraction pipe, the power supply module 12 is connected to a 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 by means of high-frequency oscillation, so as to generate continuous direct-current high-voltage static electricity. The lower surface of the vacuum chamber is provided with a sealing ring and a sponge, the sponge is provided in the sealing ring, a...

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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. [0002] Background technique [0003] 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 technologi...

Claims

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Application Information

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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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