CN106521613A - Electrolytic cell used for appearing of fingerprint on cartridge case - Google Patents
Electrolytic cell used for appearing of fingerprint on cartridge case Download PDFInfo
- Publication number
- CN106521613A CN106521613A CN201710020184.1A CN201710020184A CN106521613A CN 106521613 A CN106521613 A CN 106521613A CN 201710020184 A CN201710020184 A CN 201710020184A CN 106521613 A CN106521613 A CN 106521613A
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- China
- Prior art keywords
- shell case
- clamping
- bolt
- anode
- fingerprint
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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 invention discloses an electrolytic cell used for appearing of a fingerprint on a cartridge case, and belongs to the technical field of criminal investigation tools. The electrolytic cell comprises an electrolytic container, an anode electrode, a cathode electrode, a power source and an electrolyte solution. An anode clamping device is arranged at the tail end of the anode electrode, and a cathode clamping device is arranged at the tail end of the cathode electrode. The anode clamping device comprises a pair of opposite clamping pieces used for clamping an anode electrode plate, the head of a first bolt penetrates the middle portion of one of the clamping pieces, and a clamping area of the anode electrode plate is formed between the first bolt and the other clamping piece. The cathode clamping device comprises a pair of clamping pieces used for clamping the cartridge case, a second bolt penetrates the middle portion of a fixed clamping piece and is fixed to the fixed clamping piece, a nut is arranged at the tail end of the second bolt, a movable clamping piece is closely attached to the nut to be arranged on the second bolt in a sleeving manner, and a clamping area for the cartridge case is formed between the movable clamping piece and the fixed clamping piece. The electrolytic cell is simple in structure, materials are simple and easy to obtain, and cost is low; and the overall size is small, and carrying is convenient; and the appearing time of the fingerprint is short, the appearing effect is stable, and lines are clear.
Description
Technical field
The present invention relates to criminal investigation technical field of tools, is specifically related to a kind of electrolysis bath for fingerprint manifestation on shell case.
Background technology
Public Security Organss will directly influence formation and the harmony society of good public security situation for the detection rate of gun-related case
The structure of meeting.For a long time, for the shell case extracted on gun-related criminal-scene, investigator typically can carry out bullet trace to which
After the inspection or shooting of mark, left impression of the hand typically manifests.In order to increase the hitting dynamics of gun-related case, raising is related to
The case-solving rate of rifle case, so as to deter law-breaker to slow down the situation lasting occurred frequently of gun-related case.Detect in gun-related case
On broken, it is necessary to open up thinking, innovation mode method.Cartridge mark to be not only studied, the fingerprint being also noted that on shooting shell case.But
It is to be affected by instantaneous high-temperature high pressure in bore due to shell case, the effect for manifesting cartridge case fingerprint with conventional method is simultaneously
It is less desirable.In gun-related case, suspect shoots, press bullet during, finger is contacted with cartridge case, leaves the latent handss of antiperspirant
Print.Shell case is more with the cylindrical smooth object that copper clad steel, mild steel copper facing are main material manufacture, manifests on this class object
Impression of the hand is always technical barrier.
With the development of modern society's science and technology, metal surface finger mark appearing technique is also constantly improving, wherein more advanced
Process for show have laser appearance method, high-pressure electrostatic method, vacuum coating appearance method etc..Method above has respective excellent scarce
Point, but all equipment and operation are had high demands, it has not been convenient to Public Security Organss' development is detected in the act.Refer on fire cartridge currently used for manifesting
The equipment of stricture of vagina relies primarily on import, and is had high demands using operating condition, needs to load electrode using high pressure and the black powder of electrostatic is inhaled
Attached action；It is a kind of preferable and simple to operate side for manifesting shell case impression of the hand of effect that couple corrosion method is carried out using electrolysis bath
Method.
The content of the invention
1. technical problem to be solved
The technical problem to be solved in the present invention is to provide a kind of electrolysis bath for manifesting fingerprint on shell case of new simplicity, solution
Determine high to equipment requirements in existing Appearing Techniques of Human Fingerprints, manifested high cost, the problems such as cumbersome.
2. technical scheme
For solving the above problems, the present invention is adopted the following technical scheme that：
A kind of electrolysis bath for fingerprint manifestation on shell case, including the electrolytic vessel with closure, 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 relative for pressing from both sides
A pair of intermediate plates of anode electrode film are held, the head of bolt one is passed 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 intermediate plates for clamping shell case, and bolt two is through tingle
Middle part is fixed on tingle, and the tail end of bolt two is provided 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 tingle.
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, button cell of the power supply for 4.5V.
Further, the power supply is provided with the controlling switch of control on/off.
3. beneficial effect
(1) present invention is directed to latten(-tin) and shell case is respectively provided with different clampers so that firm grip；And the moon for adopting
Pole clamper is applied to clamp shell case, can at the top of effective protection shell case hit pinhole position important vestige area.
(2) electrolytic vessel of the present invention using glass material, can be corrosion-resistant, and Observable fingerprint manifestation process and effect.
(3) present configuration is simple, and small volume is easy to carry；Material is simply easy to get, with low cost.
(4) power supply of the invention is provided with on-off control on/off so that power supply is simple and accurate.
(5) couple corrosion method of the present invention using electrolysis bath, leaves position and shell case body using sweat fingerprint on shell case
Potential difference, and cartridge casing material copper content is high, the characteristic being easily corroded, and by the amplification of electrolysis bath electrification corrosiveness, makes
The copper ion in adsorbing electrolyte at fingerprint ridge is obtained, and is deposited in the form of copper oxide, form apparent black streakline.
Its presentation time is short, and general 5～10s can show；Manifest effect stability, lines is clear, and can be repeated several times and manifest.
(6) present invention changes electrolyte solution suitable for manifesting the cartridge case fingerprint that copper covers Steel material, you can manifest each
Metalloid fingerprint surface, electrolyte solution selection principle are that electrolyte can produce electro-chemical reaction with cathodic metal, strengthen fingerprint
Copper ion attachment at corrosion, so that show left fingerprints.
(7) present invention can not only clearly manifest the fingerprint of the wiping or destruction left on shell case, for the shell case after percussion,
Still can clearly manifest streakline.
The present invention is a set of equipment that can be applied to fingerprint manifestation on the shell case of scene extraction, by using this equipment,
Can rapidly and clearly manifest the fingerprint on fire cartridge, suspect is locked rapidly such that it is able to pass through the impression of the hand, subtracted
The possibility that little suspect commits a crime again, has farthest ensured life and the property safety of the vast name masses, and
And solve a case saving substantial amounts of time, financial resources and manpower for Public Security Organss.
Description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the present invention；
Fig. 2 be embodiment in manifest design sketch.
Wherein, 1- power supplys, 2- anode electrodes, 3- cathode electrodes, 4- electrolytic vessels, 5- electrolyte solutions, the clamping of 21- anodes
Device, 31- cathode holders, 211- intermediate plates, 212- bolts one, 311- tingles, 312- activity intermediate plates, 313- bolts two.
Specific embodiment
Embodiment
A kind of electrolysis bath for fingerprint manifestation on shell case as shown in Figure 1, including electrolytic vessel 4, anode electrode 2, the moon
Pole electrode 3, power supply 1 and electrolyte solution 5, wherein,
The electrolytic vessel 4 is to be provided with the good lid of sealing at glass material, and its opening, and closure is provided with two
Individual through hole and through hole is 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 relative a pair of the intermediate plates 211 for clamping anode electrode film, and the head of bolt 1 passes through one piece
The middle part of intermediate plate 211 and between another intermediate plate 211 formed anode electrode film clamp area；Cathode holder 3 is included for pressing from both sides
A pair of intermediate plates of shell case are held, bolt 2 313 is fixed on tingle 311 through the middle part of tingle 311, and bolt two
313 tail end is provided with a nut, and movable intermediate plate 312 is close to nut and is sleeved on bolt 2 313 and the shape between tingle 311
Into 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)；
Button cell of the power supply 1 for 4.5V, and power supply 1 is provided with the controlling switch of control on/off；
The size of the electrolysis bath is：The base diameter of electrolytic vessel 4 is 80mm, a height of 100mm；Anode electrode 2 and the moon
The length of pole electrode 3 is respectively 95mm and 100mm.
Manifest copper using above-mentioned electrolysis bath and cover fingerprint on Steel material shell case, be divided into five steps：
(1) load electrolyte solution 5：The lid of electrolytic vessel 4 is opened, it is 2.5% to take the concentration that 200mL prepared in advance
Copper sulfate solution, pour in electrolytic vessel 4；
(2) latten(-tin) is fixed：Anode electrode 2 is taken out, the bolt 1 on anode clamp holder 21 is turned on, latten(-tin) is put
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：Cathode electrode 3 is taken out, and nut in cathode holder 31 is turned on to 1cm or so, shell case is put
In cathode holder 31, nut is then tightened, promotion activity intermediate plate 312 is pressed on shell case on tingle 311, then will
Cathode electrode 3 is put back to；
(4) switch on power 1：Lid with electrode is covered on electrolytic vessel 4, the controlling switch of startup power supply 1, connected
Power supply 1 (power supply is closed mode at ordinary times, can save electric power)；
(5) observe phenomenon：Reaction cut off the electricity supply 1 after ten seconds, removed shell case, the fingerprint manifestation situation observed on shell case.
In said process, should be noted：
(1) glove will be worn when shell case is picked up；
(2) shell case early stage is using impurity such as distilled water cleaning surface dirts；
(3) note checking whether battery electric quantity is sufficient；
(4) notice that shell case is to be clamped in electric tank cathode；
(5) the attention response time；
(6) if without fingerprint manifestation on shell case of cutting off the electricity supply after ten seconds, can suitably lengthen the response time, while it is noted that
Observation cartridge case situation；
(7) if cartridge case has fingerprint manifestation out after reaction terminates, it should fixation of taking pictures immediately, for there is shooting calcination
The shell case that background color affects, can be taken the fingerprint using light viscose glue transfer printing.
As shown in Fig. 2 which manifests effect stability, lines is clear for fingerprint manifestation effect on shell case, and can be repeated several times and manifest.
Those of ordinary skill in the art it should be appreciated that the embodiment of the above be intended merely to explanation the present invention,
And be not used as limitation of the invention, as long as in the spirit of the present invention, the change to embodiment described above
Change, modification will all fall in scope of the presently claimed invention.
Claims (7)
1. a kind of electrolysis bath for fingerprint manifestation on shell case, including the electrolytic vessel with closure (4), is 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), it is characterised in that the end of anode electrode (2) and cathode electrode (3) is respectively equipped with anode clamp holder (21) and the moon
Pole clamper (31), anode clamp holder (21) include relative a pair of the intermediate plates (211) for clamping anode electrode film, bolt one
(212) head is passed through the middle part of one piece of intermediate plate (211) and is formed the folder of anode electrode film between another intermediate plate (211)
Hold area；Cathode holder includes a pair of intermediate plates for clamping shell case (3), and bolt two (313) is through in tingle (311)
Portion is fixed on tingle (311), and the tail end of bolt two (313) is provided with a nut, and movable intermediate plate (312) are close to nut sleeve
It is mounted on bolt two (313) and is formed between tingle (311) clamp area of shell case.
2. a kind of electrolysis bath for fingerprint manifestation on shell case according to claim 1, it is characterised in that the electrolysis is held
The material of device (4) is glass.
3. a kind of electrolysis bath for fingerprint manifestation on shell case according to claim 2, it is characterised 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 electrolysis bath for fingerprint manifestation on shell case according to claim 1, it is characterised in that the electrolyte
Solution (5) is the copper sulfate solution that concentration is 2.5%.
5. a kind of electrolysis bath for fingerprint manifestation on shell case according to claim 1, it is characterised in that the anode electricity
Pole piece is latten(-tin).
6. a kind of electrolysis bath for fingerprint manifestation on shell case according to claim 1, it is characterised in that the power supply
(1) it is the button cell of 4.5V.
7. a kind of electrolysis bath for fingerprint manifestation on shell case according to claim 6, it is characterised in that the power supply
(1) it is provided with the controlling 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 true CN106521613A (en) | 2017-03-22 |
| CN106521613B CN106521613B (en) | 2019-05-14 |
Family
ID=58335475
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 |
|---|
| GANG QIN等: "Visualizing latent fingerprints by electrodeposition of metal nanoparticles", 《JOURNAL OF ELECTROANALYTICAL》 * |
| MEIQIN ZHANG等: "Application of Electrodepositing Graphene Nanosheets for Latent Fingerprint Enhancement", 《ELECTROANALYSIS》 * |
| MEIQIN ZHANG等: "Latent fingerprint enhancement on conductive substrates using electrodeposition of copper", 《SCIENCE CHINA CHEMISTRY》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106521613B (en) | 2019-05-14 |
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Granted publication date: 20190514 Termination date: 20210112 |