Fingerprint extraction sampler

Abstract

The utility model discloses a fingerprint extraction sampler, and particularly relates to the technical field of fingerprint extraction, the fingerprint extraction sampler comprises a box body, the inside of the box body is connected with a vertical plate, the outer side of the vertical plate is connected with a jacket, the inner side of the jacket is connected with a glass test tube, and the bottleneck of the glass test tube is connected with a rubber plug; three connecting rods are connected to the lower portion of the rubber plug, a bottom plate is connected to the tail ends of the connecting rods, air holes are formed in the bottom plate, and a second pipe body is slidably connected to the outer side of the bottom plate; the bottom face of the inner wall of the box body is connected with an alcohol lamp, paper with hidden fingerprints is placed in the second tube body, an iodine particle is placed at the bottom of each glass test tube, during heating, iodine starts to sublimate and becomes purple-red steam, and grease and the like in the fingerprints on the paper are organic solvents, so that the fingerprints on the paper cannot be damaged. Therefore, the iodine vapor can be dissolved in the oil substances after rising to the opening of the test tube, the fingerprints are shown, the operation steps are simple, and the fingerprint extraction and sampling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fingerprint extraction, in particular to a fingerprint extraction sampler. Background Art

[0002] Fingerprint collection refers to the process of obtaining human fingerprint patterns through specific methods. This is a common biometric recognition technology used in fields such as identity authentication and crime investigation. Fingerprints are a special type of pattern on the surface of human skin, formed by the epidermis and dermis of the skin. The principle of fingerprint collection is to use the uniqueness of the fingerprint pattern and the friction of the skin on objects. When the finger touches a smooth surface, the grease, mineral oil and sweat on the fingerprint will leave traces, forming a visible fingerprint pattern.

[0003] The commonly used fingerprint extraction sampling method at present is to stick a piece of transparent tape on the fingerprint with powder, so that the powder fingerprint adheres to the tape, then peel off the tape, and then stick the tape with the fingerprint on a substrate with a large contrast with the handprint to obtain the fingerprint. However, when using this method, it is easy to apply too much powder and the fingerprint is not clear. When there is too little powder, the fingerprint is not easy to show, and the operation steps are cumbersome. Utility Model Content

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A fingerprint extraction sampler, comprising:

[0006] A box body, wherein the interior of the box body is connected to a vertical plate, the exterior of the vertical plate is connected to a jacket, the interior of the jacket is connected to a glass test tube, and the bottle mouth of the glass test tube is connected to a rubber stopper;

[0007] Three connecting rods are connected below the rubber stopper, the ends of the connecting rods are connected to a bottom plate, a vent hole is provided inside the bottom plate, and a second tube body is slidably connected to the outer side of the bottom plate;

[0008] The bottom surface of the inner wall of the box is connected with an alcohol lamp.

[0009] In a possible implementation, four sliding grooves are circumferentially formed on the side wall of the second tube body, and a sliding block is slidably connected inside the sliding groove, and the sliding block is fixedly connected to the bottom plate.

[0010] In a possible implementation manner, the diameter of the second tube body is smaller than the diameter of the glass test tube.

[0011] In a possible implementation, the glass test tube is disposed at an angle of 45 degrees, and the end of the glass test tube corresponds to the position of the alcohol lamp.

[0012] In a possible implementation, an electric push rod is embedded in the right side of the box, and one end of the electric push rod is fixedly connected to the rubber plug.

[0013] In a possible implementation, a through hole is opened on the back side of the box body, a first tube body is connected to the back side of the box body near the through hole, and an activated carbon layer and an exhaust fan are connected to the inside of the first tube body from the outside to the inside.

[0014] In a possible implementation, the position of the exhaust fan corresponds to the position of the mouth of the glass test tube.

[0015] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0016] 1. Place the paper with hidden fingerprints in the second tube and put a grain of iodine at the bottom of the glass test tube. When heated, the iodine begins to sublime and turns into purple-red vapor. Since the oils and fats in the fingerprints on the paper are organic solvents, the iodine vapor will dissolve in these oil substances after rising to the mouth of the test tube, and the fingerprints will appear. The operation steps are simple and the efficiency of fingerprint extraction and sampling is improved.

[0017] 2. Since iodine vapor is toxic, before taking out the paper, you need to turn on the exhaust fan to discharge the iodine vapor in the glass test tube and adsorb and filter it through the activated carbon layer to avoid inhalation by the human body and cause harm to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a rear view of the utility model;

[0021] Figure 3 It is a side view of the second tube body and the bottom plate of the utility model;

[0022] Figure 4 It is a side sectional view of the second tube body and the bottom plate of the utility model.

[0023] Description of reference numerals:

[0024] 1. Box body; 2. Electric push rod; 3. Exhaust fan; 4. Through hole; 5. Rubber plug; 6. Glass test tube; 7. Jacket; 8. Vertical plate; 9. Alcohol lamp; 10. Activated carbon layer; 11. First tube body; 12. Second tube body; 13. Bottom plate; 14. Air vent; 15. Connecting rod; 16. Slide groove; 17. Slider. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] The embodiments of the present application solve the problems in the prior art by providing a fingerprint extraction sampler.

[0027] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows:

[0028] Embodiment 1:

[0029] The specific structure of this embodiment is as follows: Figure 1 , Figure 3 and Figure 4 As shown, a fingerprint extraction sampler comprises:

[0030] Box body 1, the interior of box body 1 is connected with vertical plate 8, the outer side of vertical plate 8 is connected with jacket 7, the inner side of jacket 7 is connected with glass test tube 6, the bottle mouth of glass test tube 6 is connected with rubber stopper 5, the glass test tube 6 is inserted into jacket 7, the paper with fingerprint is put into the bottom plate 13, and then the rubber stopper 5 covers the glass test tube 6;

[0031] Three connecting rods 15 are connected to the bottom of the rubber stopper 5. The ends of the connecting rods 15 are connected to the bottom plate 13. The bottom plate 13 is provided with air holes 14. The outer side of the bottom plate 13 is slidably connected to the second tube body 12. Iodine sublimates under heat and turns into purple-red vapor, which enters the second tube body 12 through the air holes 14 inside the bottom plate 13. Since the grease and oil in the fingerprint on the paper are organic solvents, the iodine vapor will dissolve in these oil substances after rising to the mouth of the test tube, so the fingerprint will appear.

[0032] An alcohol lamp 9 is connected to the bottom surface of the inner wall of the box body 1. When iodine is heated, it sublimates into iodine vapor. Iodine vapor can dissolve in secretions such as grease on the fingers and form brown fingerprints. Everyone's fingers contain grease, mineral oil and water. When pressing the paper with fingers, the grease, mineral oil and sweat on the fingerprints will remain on the paper, but the human eye cannot see it. The paper with hidden fingerprints is placed in the second tube body 12, and an iodine grain is placed at the bottom of the glass test tube 6. When heated by the alcohol lamp 9, the iodine begins to sublimate and becomes purple-red vapor. Since the grease in the fingerprints on the paper are organic solvents, the iodine vapor will dissolve in these oil substances after rising to the mouth of the test tube, so the fingerprints will appear.

[0033] In some examples, four slide grooves 16 are circumferentially opened on the side wall of the second tube body 12, and a slider 17 is slidably connected inside the slide groove 16, and the slider 17 is fixedly connected to the bottom plate 13. When the fingerprint is revealed, the electric push rod 2 is turned on, and the electric push rod 2 drives the rubber plug 5 to move backward, and the second tube body 12 and the bottom plate 13 are taken out of the glass test tube 6. Then, under the connection between the slide groove 16 and the slider 17, the second tube body 12 is easily slid to take out the paper in the bottom plate 13.

[0034] In some examples, the diameter of the second tube body 12 is smaller than the diameter of the glass test tube 6 , which helps to avoid direct contact between the second tube body 12 and the glass test tube 6 and avoid wear on the glass test tube 6 .

[0035] In some examples, the glass test tube 6 is set at a 45-degree angle, and the end of the glass test tube 6 corresponds to the position of the alcohol lamp 9, and the mouth of the test tube is inclined at a 45-degree angle to prevent water vapor released when the solid reagent is heated from condensing at the mouth of the test tube and then flowing back to the bottom of the hot test tube, thereby bursting the test tube.

[0036] In some examples, an electric push rod 2 is embedded in the right side of the box body 1, and one end of the electric push rod 2 is fixedly connected to the rubber plug 5. When the electric push rod 2 is turned on, the electric push rod 2 drives the rubber plug 5 to move backward, and the second tube body 12 and the bottom plate 13 are taken out of the glass test tube 6, thereby preventing people from manually taking out the second tube body 12 and the bottom plate 13 from the glass test tube 6, thereby preventing iodine vapor from being inhaled by the human body.

[0037] By adopting the above technical solution:

[0038] Put the paper with hidden fingerprints in the second tube body 12, and put an iodine at the bottom of the glass test tube 6. When heated, the iodine begins to sublime and turns into purple-red vapor. Since the oils and fats in the fingerprints on the paper are organic solvents, the iodine vapor will dissolve in these oil substances after rising to the mouth of the test tube, so the fingerprints will appear. The operation steps are simple and the efficiency of fingerprint extraction and sampling is improved.

[0039] Embodiment 2:

[0040] The specific structure of this embodiment is as follows: Figure 1-Figure 2 As shown, a through hole 4 is provided on the back side of the box body 1, and a first tube body 11 is connected to the back side of the box body 1 near the through hole 4. The inside of the first tube body 11 is respectively connected with an activated carbon layer 10 and an exhaust fan 3 from the outside to the inside. When the exhaust fan 3 is turned on, the iodine vapor in the glass test tube 6 is discharged, and is adsorbed and filtered by the activated carbon layer 10 to avoid being inhaled by the human body and causing harm to the human body. The function of the activated carbon layer 10 is mainly to adsorb harmful gases, filter out insoluble substances, and adsorb some soluble substances. The components of activated carbon are mainly made of charcoal, various fruit shells and high-quality coal.

[0041] In some examples, the position of the exhaust fan 3 corresponds to the position of the mouth of the glass test tube 6, and the electric push rod 2 drives the rubber stopper 5 to move backward, and the second tube body 12 and the bottom plate 13 are taken out of the glass test tube 6. By setting the position of the exhaust fan 3 to correspond to the position of the mouth of the glass test tube 6, the iodine vapor in the glass test tube 6 can be easily discharged.

[0042] By adopting the above technical solution:

[0043] Since iodine vapor is toxic, before taking out the paper, it is necessary to turn on the exhaust fan 3 to exhaust the iodine vapor in the glass test tube 6 and adsorb and filter it through the activated carbon layer 10 to prevent it from being inhaled by the human body and causing harm to the human body.

[0044] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fingerprint extraction sampler, characterized in that: include: A box body (1), wherein the interior of the box body (1) is connected to a vertical plate (8), the exterior of the vertical plate (8) is connected to a jacket (7), the interior of the jacket (7) is connected to a glass test tube (6), and the mouth of the glass test tube (6) is connected to a rubber stopper (5); Three connecting rods (15) are connected below the rubber stopper (5), the ends of the connecting rods (15) are connected to a bottom plate (13), a vent hole (14) is provided inside the bottom plate (13), and a second tube body (12) is slidably connected to the outer side of the bottom plate (13); An alcohol lamp (9) is connected to the bottom surface of the inner wall of the box (1).

2. A fingerprint extraction sampler according to claim 1, characterized in that: Four sliding grooves (16) are circumferentially formed on the side wall of the second tube body (12), and a sliding block (17) is slidably connected inside the sliding groove (16), and the sliding block (17) is fixedly connected to the bottom plate (13).

3. A fingerprint extraction sampler according to claim 1, characterized in that: The diameter of the second tube (12) is smaller than the diameter of the glass test tube (6).

4. A fingerprint extraction sampler according to claim 1, characterized in that: The glass test tube (6) is arranged at an angle of 45 degrees, and the end of the glass test tube (6) corresponds to the position of the alcohol lamp (9).

5. The fingerprint extraction sampler according to claim 1, characterized in that: An electric push rod (2) is embedded on the right side of the box body (1), and one end of the electric push rod (2) is fixedly connected to a rubber plug (5).

6. A fingerprint extraction sampler according to claim 1, characterized in that: A through hole (4) is provided on the back side of the box body (1), a first tube body (11) is connected to the back side of the box body (1) near the through hole (4), and the inside of the first tube body (11) is respectively connected to an activated carbon layer (10) and an exhaust fan (3) from the outside to the inside.

7. A fingerprint extraction sampler according to claim 6, characterized in that: The position of the exhaust fan (3) corresponds to the position of the bottle mouth of the glass test tube (6).

Images