CN106521613B - A kind of electrolytic cell of the fingerprint manifestation on shell case - Google Patents
A kind of electrolytic cell of the fingerprint manifestation on shell case Download PDFInfo
- Publication number
- CN106521613B CN106521613B CN201710020184.1A CN201710020184A CN106521613B CN 106521613 B CN106521613 B CN 106521613B CN 201710020184 A CN201710020184 A CN 201710020184A CN 106521613 B CN106521613 B CN 106521613B
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- Prior art keywords
- shell case
- intermediate plate
- bolt
- electrolytic cell
- anode
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heart & Thoracic Surgery (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Veterinary Medicine (AREA)
- Molecular Biology (AREA)
- Medical Informatics (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The electrolytic cell of the invention discloses a kind of on shell case fingerprint manifestation, belong to criminal investigation technical field of tools, including electrolytic vessel, anode electrode, the end of cathode electrode, power supply and electrolyte solution, anode electrode and cathode electrode is respectively equipped with anode clamp holder and cathode holder, anode clamp holder includes opposite for clamping a pair of of intermediate plate of anode electrode film, and the head of bolt one passes through the middle part of one piece of intermediate plate and forms the clamp area of anode electrode film between another intermediate plate；Cathode holder includes a pair of of intermediate plate for clamping shell case, bolt two passes through to be fixed in fixing clip in the middle part of fixing clip, and the tail end of bolt two is equipped with a nut, movable intermediate plate is close to the clamp area that nut is sleeved on bolt two and forms shell case between fixing clip.The configuration of the present invention is simple, material are simply easy to get, low in cost；Overall volume is smaller, easy to carry；Its presentation time is short, shows effect stability, and lines is clear.
Description
Technical field
The present invention relates to criminal investigation technical field of tools, are specifically related to a kind of electrolytic cell of fingerprint manifestation on shell case.
Background technique
Public security organ will directly influence the detection rate of gun-related case formation and the harmony society of good public security situation
The building of meeting.For a long time, for the shell case extracted on gun-related criminal-scene, investigator generally can carry out bullet trace to it
Left impression of the hand generally shows after the inspection of mark is either shot.In order to increase the hitting dynamics of gun-related case, raising is related to
The case-solving rate of rifle case, to deter law-breaker to slow down the lasting high-incidence situation of gun-related case.It is detectd in gun-related case
On broken, it is necessary to open up thinking, innovation mode method.Cartridge mark is not only studied, the fingerprint being also noted that on shooting shell case.But
It is the influence due to shell case in bore by instantaneous high-temperature high pressure, shows the effect of cartridge case fingerprint simultaneously with conventional method
It is less desirable.In gun-related case, during suspect shoots, presses bullet, finger is contacted with cartridge case, leaves the latent hand of sweat
Print.Shell case mostly with copper clad steel, the cylindrical smooth object that mild steel copper facing is the manufacture of main material, shows on this kind of objects
Impression of the hand is always technical problem.
With the development of modern society's science and technology, metal surface finger mark appearing technique is also being constantly progressive, wherein more advanced
Process for show have laser appearance method, high-pressure electrostatic method, vacuum coating appearance method etc..Above method has respective excellent scarce
Point, but all to equipment and high operation requirements, it has not been convenient to public security organ, which carries out, to detect in the act.Refer on fire cartridge currently used for showing
The equipment of line relies primarily on import, and requires height using operating condition, needs to load electrode using high pressure and the black powder of electrostatic is inhaled
Attached movement；Carrying out couple corrosion method using electrolytic cell is a kind of preferable and easy to operate side for showing shell case impression of the hand of effect
Method.
Summary of the invention
1. technical problems to be solved
The technical problem to be solved in the present invention is that providing a kind of new easy electrolytic cell for showing fingerprint on shell case, solution
Determined the high requirements on the equipment in existing Appearing Techniques of Human Fingerprints, show it is at high cost, it is cumbersome the problems such as.
2. technical solution
To solve the above problems, the present invention adopts the following technical scheme that:
A kind of electrolytic cell of the fingerprint manifestation on shell case, the electrolytic vessel including having sealing cover, is separately fixed on close
Anode electrode and cathode electrode in capping, the electrolyte solution in power supply and electrolytic vessel between two electrodes, the anode
The end of electrode and cathode electrode is respectively equipped with anode clamp holder and cathode holder, and anode clamp holder includes opposite for pressing from both sides
A pair of of intermediate plate of anode electrode film is held, the head of bolt one passes through the middle part of one piece of intermediate plate and formed between another intermediate plate
The clamp area of anode electrode film；Cathode holder includes a pair of of intermediate plate for clamping shell case, and bolt two passes through fixing clip
Middle part is fixed in fixing clip, and the tail end of bolt two is equipped with a nut, and movable intermediate plate is close to nut and is sleeved on bolt two
And the clamp area of shell case is formed between fixing clip.
Further, the material of the electrolytic vessel is glass.
Further, the base diameter of the electrolytic vessel is 80mm, a height of 100mm；Anode electrode and cathode electrode
Length is respectively 95mm and 100mm.
Further, the electrolyte solution is the copper sulfate solution that concentration is 2.5%.
Further, the anode electrode film is latten(-tin).
Further, the power supply is the button cell of 4.5V.
Further, the power supply is equipped with the control switch of control on/off.
3. beneficial effect
(1) different clampers is respectively set for latten(-tin) and shell case in the present invention, so that firm grip；And the yin used
Pole clamper is applied to clamping shell case, can effectively protect the important trace area at hit pinhole position at the top of shell case.
(2) present invention uses the electrolytic vessel of glass material, can be corrosion-resistant, and Observable fingerprint manifestation process and effect.
(3) the configuration of the present invention is simple, small volume are easy to carry；Material is simply easy to get, low in cost.
(4) power supply of the invention is equipped with switch control on/off, so that power supply control is simple and accurate.
(5) present invention uses the couple corrosion method of electrolytic cell, leaves position and shell case ontology using sweat fingerprint on shell case
Potential difference and cartridge casing material copper content it is high, the characteristic being easily corroded is made by the amplification of electrolytic cell electrification corrosiveness
The copper ion at fingerprint ridge in adsorbing electrolyte is obtained, and is deposited in the form of copper oxide, high-visible black streakline is formed.
Its presentation time is short, and general 5~10s can be showed；Show effect stability, lines is clear, and can be repeated several times and show.
(6) present invention is suitable for showing the cartridge case fingerprint that copper covers Steel material, changes electrolyte solution, can show each
Metalloid fingerprint surface, electrolyte solution selection principle are that electrolyte can generate electro-chemical reaction with cathodic metal, enhance fingerprint
Copper ion attachment at corrosion, to show left fingerprints.
(7) present invention can not only clearly show the fingerprint of the wiping or destruction left on shell case, for the shell case after percussion,
It still can clearly show streakline.
The present invention is the equipment of fingerprint manifestation on a set of shell case that can be applied to scene extraction, by using this equipment,
The fingerprint on fire cartridge can be shown rapidly and clearly, so as to lock suspect rapidly by the impression of the hand, subtracted
The possibility that small suspect commits a crime again, has ensured the life and property safety of the vast name masses to the greatest extent, and
And it solves a case for public security organ and saves a large amount of time, financial resources and manpower.
Detailed description of the invention
The present invention is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is to show effect picture in embodiment.
Wherein, 1- power supply, 2- anode electrode, 3- cathode electrode, 4- electrolytic vessel, 5- electrolyte solution, the clamping of 21- anode
Device, 31- cathode holder, 211- intermediate plate, 212- bolt one, 311- fixing clip, 312- activity intermediate plate, 313- bolt two.
Specific embodiment
Embodiment
A kind of electrolytic cell of fingerprint manifestation on shell case as shown in Figure 1, including electrolytic vessel 4, anode electrode 2, yin
Pole electrode 3, power supply 1 and electrolyte solution 5, wherein
The electrolytic vessel 4 is glass material, and its opening is equipped with the good lid of leakproofness, and sealing cover is equipped with two
A through-hole and through hole are respectively fixed with anode electrode 2 and cathode electrode 3；
The end of the anode electrode 2 and cathode electrode 3 is respectively equipped with anode clamp holder 21 and cathode holder 31, anode
Clamper 21 includes opposite for clamping a pair of of intermediate plate 211 of anode electrode film, and the head of bolt 1 passes through one piece
The middle part of intermediate plate 211 and the clamp area that anode electrode film is formed between another intermediate plate 211；Cathode holder 3 includes for pressing from both sides
A pair of of intermediate plate of shell case is held, the middle part that bolt 2 313 passes through fixing clip 311 is fixed in fixing clip 311, and bolt two
313 tail end is equipped with a nut, and the movable abutting of intermediate plate 312 nut is sleeved on bolt 2 313 and the shape between fixing clip 311
At the clamp area of shell case；
The electrolyte solution 5 is the copper sulfate solution that concentration is 2.5%, and the anode electrode film is latten(-tin)；
The power supply 1 is the button cell of 4.5V, and power supply 1 is equipped with the control switch of control on/off；
The size of the electrolytic cell are as follows: the base diameter of electrolytic vessel 4 is 80mm, a height of 100mm；Anode electrode 2 and yin
The length of pole electrode 3 is respectively 95mm and 100mm.
Show copper using above-mentioned electrolytic cell and cover fingerprint on Steel material shell case, is divided into five steps:
(1) it loads electrolyte solution 5: opening the lid of electrolytic vessel 4, taking 200mL to shift to an earlier date prepared concentration is 2.5%
Copper sulfate solution, pour into electrolytic vessel 4；
(2) latten(-tin) is fixed: being taken out anode electrode 2, is unscrewed the bolt 1 on anode clamp holder 21, latten(-tin) is set
In anode clamp holder 21, bolt 1 is then tightened, latten(-tin) is pressed on intermediate plate 211, then anode electrode 2 is put back to；
(3) shell case is fixed: being taken out cathode electrode 3, is unscrewed nut in cathode holder 31 to 1cm or so, shell case is set
In cathode holder 31, nut is then tightened, shell case is pressed in fixing clip 311 by promotion activity intermediate plate 312, then will
Cathode electrode 3 is put back to；
(4) power on 1: the lid with electrode being covered on electrolytic vessel 4, the control switch of startup power supply 1, connected
Power supply 1 (power supply is usually in off state, and can save electric power)；
(5) observe phenomenon: reaction cut off the power 1 after ten seconds, removed shell case, observed the fingerprint manifestation situation on shell case.
In the above process, it should be noted:
(1) gloves to be worn when shell case picks up；
(2) shell case early period uses the impurity such as distilled water clean the surface dust；
(3) pay attention to checking whether battery capacity is sufficient；
(4) notice that shell case is to be clamped in electric tank cathode；
(5) the attentive response time；
(6) if without fingerprint manifestation on shell case of cutting off the power after ten seconds, the reaction time can suitably be lengthened, while it is noted that
Observe cartridge case situation；
(7) if cartridge case has fingerprint manifestation to come out after reaction, it should fixation of taking pictures immediately, for there is shooting calcination
The shell case that background color influences, can be used light viscose glue transfer printing and takes the fingerprint.
For fingerprint manifestation effect on shell case as shown in Fig. 2, it shows effect stability, lines is clear, and can be repeated several times and show.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as the change in spirit of the invention, to embodiment described above
Change, modification will all be fallen in scope of the presently claimed invention.
Claims (7)
1. a kind of electrolytic cell of the fingerprint manifestation on shell case, the electrolytic vessel (4) including having sealing cover, are separately fixed on close
Anode electrode (2) and cathode electrode (3) in capping, the electrolyte in power supply (1) and electrolytic vessel (4) between two electrodes are molten
Liquid (5), which is characterized in that the end of the anode electrode (2) and cathode electrode (3) is respectively equipped with anode clamp holder (21) and yin
Pole clamper (31), anode clamp holder (21) include opposite for clamping a pair of of intermediate plate (211) of anode electrode film, bolt one
(212) head passes through the middle part of one piece of intermediate plate (211) and forms the folder of anode electrode film between another intermediate plate (211)
Hold area；Cathode holder includes a pair of of intermediate plate for clamping shell case, and bolt two (313) passes through the middle part of fixing clip (311)
It is fixed on fixing clip (311), and the tail end of bolt two (313) is equipped with a nut, movable intermediate plate (312) is close to nut suit
The clamp area of shell case is formed on bolt two (313) and between fixing clip (311).
2. a kind of electrolytic cell of fingerprint manifestation on shell case according to claim 1, which is characterized in that the electrolysis is held
The material of device (4) is glass.
3. a kind of electrolytic cell of fingerprint manifestation on shell case according to claim 2, which is characterized in that the electrolysis is held
The base diameter of device (4) is 80mm, a height of 100mm；The length of anode electrode (2) and cathode electrode (3) be respectively 95mm and
100mm。
4. a kind of electrolytic cell of fingerprint manifestation on shell case according to claim 1, which is characterized in that the electrolyte
Solution (5) is the copper sulfate solution that concentration is 2.5%.
5. a kind of electrolytic cell of fingerprint manifestation on shell case according to claim 1, which is characterized in that the anode electricity
Pole piece is latten(-tin).
6. a kind of electrolytic cell of fingerprint manifestation on shell case according to claim 1, which is characterized in that the power supply
(1) button cell for being 4.5V.
7. a kind of electrolytic cell of fingerprint manifestation on shell case according to claim 6, which is characterized in that the power supply
(1) it is equipped with the control switch of control on/off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710020184.1A CN106521613B (en) | 2017-01-12 | 2017-01-12 | A kind of electrolytic cell of the fingerprint manifestation on shell case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710020184.1A CN106521613B (en) | 2017-01-12 | 2017-01-12 | A kind of electrolytic cell of the fingerprint manifestation on shell case |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106521613A CN106521613A (en) | 2017-03-22 |
| CN106521613B true CN106521613B (en) | 2019-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710020184.1A Expired - Fee Related CN106521613B (en) | 2017-01-12 | 2017-01-12 | A kind of electrolytic cell of the fingerprint manifestation on shell case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106521613B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1557792A (en) * | 1976-07-14 | 1979-12-12 | Banbury Plastics & Eng Ltd | Clamp |
| DE3439943A1 (en) * | 1984-11-02 | 1986-05-15 | Bernd 7530 Pforzheim Oberle | Clamp for holding printed-circuit boards in an electroplating bath |
| CN101899681A (en) * | 2009-06-01 | 2010-12-01 | 高伟 | Anode conducting clamping fixture |
| CN203999873U (en) * | 2014-08-09 | 2014-12-10 | 西安华科光电有限公司 | A kind of aluminium proton shell case differential arc oxidation hanger |
| CN204237876U (en) * | 2014-11-05 | 2015-04-01 | 湖南金旺铋业股份有限公司 | A kind of clamper |
| CN206396350U (en) * | 2017-01-12 | 2017-08-11 | 江苏警官学院 | A kind of electrolytic cell for fingerprint manifestation on shell case |
-
2017
- 2017-01-12 CN CN201710020184.1A patent/CN106521613B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1557792A (en) * | 1976-07-14 | 1979-12-12 | Banbury Plastics & Eng Ltd | Clamp |
| DE3439943A1 (en) * | 1984-11-02 | 1986-05-15 | Bernd 7530 Pforzheim Oberle | Clamp for holding printed-circuit boards in an electroplating bath |
| CN101899681A (en) * | 2009-06-01 | 2010-12-01 | 高伟 | Anode conducting clamping fixture |
| CN203999873U (en) * | 2014-08-09 | 2014-12-10 | 西安华科光电有限公司 | A kind of aluminium proton shell case differential arc oxidation hanger |
| CN204237876U (en) * | 2014-11-05 | 2015-04-01 | 湖南金旺铋业股份有限公司 | A kind of clamper |
| CN206396350U (en) * | 2017-01-12 | 2017-08-11 | 江苏警官学院 | A kind of electrolytic cell for fingerprint manifestation on shell case |
Non-Patent Citations (3)
| Title |
|---|
| Application of Electrodepositing Graphene Nanosheets for Latent Fingerprint Enhancement;Meiqin Zhang等;《Electroanalysis》;20131112;第26卷(第1期);209-215 |
| Latent fingerprint enhancement on conductive substrates using electrodeposition of copper;Meiqin Zhang等;《SCIENCE CHINA Chemistry》;20150731;第58卷(第7期);1200-1205 |
| Visualizing latent fingerprints by electrodeposition of metal nanoparticles;Gang Qin等;《Journal of Electroanalytical》;20130208;第693卷;122-126 |
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| Publication number | Publication date |
|---|---|
| CN106521613A (en) | 2017-03-22 |
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Granted publication date: 20190514 Termination date: 20210112 |