Rotary fingerprint fuming display instrument capable of converting multiple chemical reagents

Abstract

The utility model relates to a rotary fingerprint fuming instrument capable of converting various chemical reagents, which comprises a rear support, a front support, a fuming cover, a reagent tube and a heating plate, and is characterized in that a rear shaft is fixed on the front side surface of the rear support, a front shaft is fixed on the rear side surface of the front support, and the front shaft is connected with the rear shaft; a rotating disc is rotationally arranged on the front shaft, a plurality of reagent tubes are uniformly fixed on a circle taking the front shaft as the center on the rotating disc, a fuming pipeline is arranged on the front support, the front end of the fuming pipeline is connected with a fuming cover, and vent holes are formed in the fuming cover; and a metal sheet in contact with the heating sheet is arranged at the rear end of the reagent tube. According to the rotary fingerprint fuming instrument, storage of various reagents for fingerprint fuming is achieved, the atomized fuming reagents escape through the vent holes in the fuming cover, fingerprint fuming on the surface of an object to be subjected to fingerprint extraction is achieved, and the problem that an existing fingerprint fuming instrument can only use one medicine for fuming is solved.

Description

Technical Field

[0001] This utility model relates to a fingerprint fuming device, and more specifically, to a rotary fingerprint fuming device capable of converting various chemical reagents. Background Technology

[0002] In the process of collecting physical evidence at crime scenes, the complete extraction of latent fingerprints is often a key factor in solving cases. However, latent fingerprints differ from formed and obvious fingerprints in that they cannot be observed with the naked eye and require physical or chemical methods for visualization and extraction. The powder method is one of the commonly used physical methods for extracting latent fingerprints. It involves using a fingerprint brush to apply aluminum powder, fluorescent powder, or magnetic powder to the area where the latent fingerprint is located, thereby revealing the fingerprint.

[0003] Chemical extraction of latent fingerprints utilizes the chemical reaction between chemical reagents and substances in sweat to reveal fingerprint traces. Commonly used chemical agents include ninhydrin, silver nitrate, iodine, and 502 degumming and developing agent. Ninhydrin reacts with amino acids in the sweat secreted by the fingers to produce Ruhrmann violet, thus revealing the fingerprint; silver nitrate reacts with chloride ions in sweat to produce silver chloride precipitate, also revealing the fingerprint; and iodine vapor reacts with oils in sweat to form a yellow fingerprint mark. In the actual extraction process of latent fingerprints, multiple reagents are usually used interchangeably to extract the fingerprint trace with the best clarity.

[0004] Existing fingerprint fumigation devices typically only utilize one chemical reagent, failing to meet the on-site demand for fingerprint extraction using multiple chemical reagents. Therefore, this paper proposes a fumigation device capable of switching between multiple chemical reagents to meet the needs of on-site evidence collection for fingerprint extraction using various reagents. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides a rotary fingerprint fuming instrument that can perform multiple chemical reagent conversions.

[0006] This utility model discloses a rotary fingerprint fumigation device capable of converting various chemical reagents, comprising a rear support, a front support, a fumigation hood, reagent tubes, and a heating plate. The reagent tubes store the fingerprint fumigation reagents, and the heating plate heats and atomizes the reagents in the reagent tubes. Its features include: a rear shaft fixed to the front side of the rear support, a front shaft fixed to the rear side of the front support, and the front shaft connected to the rear shaft; a turntable rotatably mounted on the front shaft, with multiple reagent tubes evenly fixed on a circle centered on the front shaft; a fumigation pipe mounted on the front support, the rear end of which aligns with the front opening of the reagent tube, and the front end of the fumigation pipe connected to the fumigation hood, which has a vent hole communicating with the fumigation pipe; a thin metal sheet in contact with the heating plate at the rear end of the reagent tube; a battery housed in the rear support; a control board mounted on the rear support, with operation buttons on the control board.

[0007] This utility model discloses a rotary fingerprint display device capable of converting various chemical reagents. The top of the rear support is provided with a push block that can move back and forth. The two sides of the top of the rear support are provided with side plates to limit the push block. The heating element is fixed to the front end of the push block.

[0008] This invention relates to a rotary fingerprint fumigation device capable of converting various chemical reagents. Multiple suction cups are uniformly fixed on the front side of the fumigation cover, and the suction cups are used to adhere to the surface of the object to be fumigated.

[0009] This invention relates to a rotary fingerprint scanning device capable of converting various chemical reagents, wherein the bottom of the front support is equipped with a forward-facing infrared searchlight and an ultraviolet searchlight.

[0010] This utility model discloses a rotary fingerprint display device capable of converting various chemical reagents. A drive motor with its output shaft facing backward is fixed on the front support. A circular groove is provided on the front side of the turntable, with the front shaft as the center. A drive wheel located in the circular groove is fixed on the output shaft of the drive motor.

[0011] The present invention relates to a rotary fingerprint imaging device capable of converting various chemical reagents, wherein the front end of the rear shaft is connected to the rear end of the front shaft via a pin shaft.

[0012] The present invention relates to a rotary fingerprint display device capable of converting various chemical reagents, wherein a tail handle is fixed on the rear side of the rear support and a side handle is fixed on the side of the rear support.

[0013] The beneficial effects of this utility model are as follows: The rotary fingerprint fumigation device of this utility model is equipped with a rear support, a front support, a turntable, a fumigation hood, a heating plate, and reagent tubes. The rear support and the front support are connected via a rear shaft and a front shaft. The fumigation pipe on the front support is connected to the fumigation hood. Multiple reagent tubes are evenly fixed on a circle centered on the front shaft on the turntable. The front opening of the reagent tube is aligned with the rear end of the fumigation pipe. A thin metal sheet is provided at the rear end of the reagent tube to contact the heating plate. Because multiple reagent tubes are provided, multiple reagents for fingerprint fumigation can be stored. In use, the reagent tube storing the required reagent is rotated to a position aligned with the fumigation pipe, the front cover of the reagent tube is opened, and the rear heating plate is pushed to a position to contact the thin metal sheet. The reagent is atomized by heating, and the atomized fumigation reagent escapes through the vent on the fumigation hood, realizing fingerprint fumigation on the surface of the object to be fingerprinted. This solves the problem that existing fingerprint fumigation devices can only use one type of reagent for fumigation.

[0014] Furthermore, by setting multiple suction cups on the front side of the fumigation cover, the suction cups can not only adhere to the surface of the object from which the fingerprint is to be extracted, but also control the vent on the fumigation cover to maintain a constant distance from the surface of the object from which the fingerprint is to be extracted, which is conducive to fumigating and developing clearer fingerprint traces.

[0015] Furthermore, by fixing a drive motor on the front support and opening a circular groove on the turntable, and fixing a drive wheel located in the circular groove on the output shaft of the drive motor, the reagent tubes on the turntable can be driven to rotate automatically under the action of the drive motor.

[0016] Furthermore, by installing infrared and ultraviolet spotlights on the front support, the fingerprints that have been exposed are more clearly visible. Attached Figure Description

[0017] Figure 1 This is a front view of the rotary fingerprint imaging device of this utility model;

[0018] Figure 2 This is a rear view of the rotary fingerprint imaging device of this utility model;

[0019] Figure 3 This is a left view of the rotary fingerprint imaging device of this utility model;

[0020] Figure 4 This is a right view of the rotary fingerprint imaging device of this utility model;

[0021] Figure 5 This is a top view of the rotary fingerprint imaging device of this utility model;

[0022] Figure 6 This is a bottom view of the rotary fingerprint imaging device of this utility model;

[0023] Figure 7 , Figure 8 All are perspective views of the rotary fingerprint imaging device of this utility model;

[0024] Figure 9 This is a cross-sectional view of the rotary fingerprint imaging device of this utility model.

[0025] In the diagram: 1 Rear support, 2 Front support, 3 Fumigation and display hood, 4 Rear axle, 5 Front axle, 6 Fumigation and display pipe, 7 Vent, 8 Heating element, 9 Push block, 10 Turntable, 11 Reagent tube, 12 Metal sheet, 13 Suction cup, 14 Control board, 15 Tail handle, 16 Side handle, 17 Pin, 18 Drive motor, 19 Circular groove, 20 Drive wheel, 21 Infrared searchlight, 22 Ultraviolet searchlight, 23 Side plate. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 6 As shown, the front view, rear view, left view, right view, top view, and bottom view of the rotary fingerprint display device of this utility model are given respectively. Figure 7 and Figure 8 All of them are given a 3D diagram. Figure 9 A cross-sectional view is provided, showing a rotary fingerprint fumigation device capable of converting various chemical reagents. It consists of a rear support 1, a front support 2, a fumigation cover 3, a turntable 10, a reagent tube 11, and a heating element 8. A battery providing power is fixed in the rear support 1, and a control board 14 is fixed to the rear surface of the rear support 1. The control board 14 controls the operation of the entire fumigation device and has control buttons. A forward-facing rear shaft 4 is fixed to the front side of the rear support 1, and a rearward-facing front shaft 5 is fixed to the rear side of the front support 2. The front shaft 5 and the rear shaft 4 are connected via a pin 17. The pin 17 not only connects the front shaft 5 and the rear shaft 4, but also allows the device to be folded after use by rotating the front shaft 5 and the rear shaft 4 around the pin 17 for easy storage and carrying.

[0028] The front support 2 shown is provided with a fumigation and development pipe 6, and the fumigation and development cover 3 is fixed to the front end of the fumigation and development pipe 6. The fumigation and development cover 3 is provided with a vent 7 that communicates with the fumigation and development pipe 6. The vapor of the fumigation and development reagent in the fumigation and development pipe 6 can escape through the vent 7 to achieve fumigation and development of the surface of the object to be extracted.

[0029] A turntable 10 is mounted on the front shaft 5. Multiple reagent tubes 11 are evenly fixed on the turntable 10 within a circle centered on the front shaft 5. These reagent tubes 11 store fingerprint-developing reagents. The rear end of the fingerprint-developing pipe 6 is aligned with the front opening of the reagent tube 11. Because multiple reagent tubes 11 are fixed on the turntable 10, various fingerprint-developing reagents can be stored. During fingerprint extraction, the reagent that will produce the clearest fingerprint can be selected for fingerprint development based on the specific circumstances.

[0030] A metal sheet 12 is provided at the rear end of the reagent tube 11. A heating element 8 is used to contact the metal sheet 12. The heating element 8 achieves heat conduction through contact with the metal sheet 12, thereby heating and atomizing the reagent in the reagent tube 11. The heating element 8 is fixed to the front end of the pushing block 9, which is located at the upper end of the rear support 1. The pushing block 9 can move back and forth. Side plates 23 are provided on both sides of the upper end of the rear support 1 to limit the movement of the pushing block 9. When the required reagent tube 11 is rotated to a position aligned with the fumigation and display pipe 6, the pushing block 9 is pushed forward so that the heating element 8 on the pushing block 9 contacts the metal sheet 12 at the rear end of the reagent tube 11, thereby heating the reagent in the reagent tube 11.

[0031] To ensure better fingerprint development, multiple suction cups 13 are evenly fixed on the front side of the development cover 3. The suction cups 13 can not only firmly fix the fingerprint to the surface of the object to be extracted, but also ensure that the ventilation holes 7 on the development cover 3 are kept at a constant distance from the surface of the object to be extracted. This is more conducive to the uniform adhesion of the reagent vapor escaping through the ventilation holes 7 to the fingerprint to be extracted, which is beneficial to the clear display of the fingerprint.

[0032] To achieve automatic rotation of the turntable 10, a drive motor 18 is fixed on the front support 2. The output shaft of the drive motor 18 faces rearward, and a drive wheel 20 is fixed on the output shaft of the drive motor 18. A circular groove 19 is provided on the front side of the turntable 10, with the front shaft 5 as the center. The drive wheel 20 on the output shaft of the drive motor 18 is located in the circular groove 19. The drive wheel 20 can drive the turntable 10 to rotate by making close contact with one side wall of the circular groove 19, that is, by using the friction between the drive wheel 20 and the circular groove 19 to drive the turntable 10 to rotate.

[0033] The front support 20 shown is also equipped with a forward-facing infrared searchlight 21 and an ultraviolet searchlight 22. Illumination by the infrared searchlight 21 and ultraviolet searchlight 22 allows for clearer fingerprint information. A tail handle 15 is fixed to the rear side of the rear support 1 shown, and a side handle 16 is fixed to the side of the rear support 1. Users can use the fingerprint scanner by holding the tail handle 15 and the side handle 16.

[0034] The method of using the rotary fingerprint imaging device of this utility model is as follows:

[0035] The operator first rotates the reagent tube 11, which stores the required reagents, to a position aligned with the fumigation and development pipe 6, and then opens the sealing cap at the front end of the reagent tube 11. Next, the pusher block 9 is pushed forward so that the heating plate 8 comes into contact with the metal sheet 12 at the rear end of the reagent tube 11. Then, the fumigation and development cover 3 is brought close to the surface of the object from which fingerprints are to be extracted, and is attached to the surface of the object from which fingerprints are to be extracted using the suction cup 13. Finally, the heating function of the heating plate 8 is turned on, and the reagents in the reagent tube 11 are heated to generate reagent vapor. The generated reagent vapor escapes through the fumigation and development pipe 6 and the vent 7, thus achieving the fumigation and development of fingerprints.

Claims

1. A rotating fingerprint fuming device capable of multiple chemical reagent conversion, comprising a rear support (1), a front support (2), a fuming cover (3), a reagent tube (11) and a heating sheet (8), the reagent tube is used to store reagents for fingerprint fuming, and the heating sheet is used to heat and atomize the reagents in the reagent tube; characterized in that: The rear axle (4) is fixed on the front side of the rear support, the front axle (5) is fixed on the rear side of the front support, and the front axle is connected with the rear axle; the rotary disc (10) is rotatably arranged on the front axle, a plurality of reagent tubes (11) are uniformly fixed on the circle with the front axle as the center on the rotary disc, the fumigation and display pipeline (6) is arranged on the front support, the rear end of the fumigation and display pipeline is aligned with the front end opening of the reagent tube, the front end of the fumigation and display pipeline is connected with the fumigation and display cover, the fumigation and display cover is provided with the air hole (7) communicated with the fumigation and display pipeline; the rear end of the reagent tube is provided with the metal sheet (12) in contact with the heating sheet (8), the battery is arranged in the rear support, the control panel (14) is arranged on the rear support, and the operation button is arranged on the control panel. ​ 2. The multi-chemical convertible rotary fingerprint fuming apparatus according to claim 1, wherein: The top of the rear support (1) is provided with the push block (9) movable forward and backward, the side plates (23) for limiting the push block are arranged on the two sides of the top of the rear support, and the heating sheet is fixed on the front end of the push block.

3. The multi-chemical conversion rotary finger fumator according to claim 1 or 2, wherein: A plurality of suction cups (13) are uniformly fixed on the front side of the fumigation and display cover (3), and the suction cups are used for adsorbing on the surface of the object to be fumigated and displayed.

4. The multi-chemical conversion rotary finger fumator according to claim 1 or 2, wherein: The infrared searchlight (21) and the ultraviolet searchlight (22) are arranged on the bottom of the front support (2) and face forward.

5. The multi-chemical conversion rotary finger fumigator according to claim 1 or 2, wherein: The driving motor (18) with the output shaft facing backward is fixed on the front support (2), the circular groove (19) is arranged on the front side of the rotary disc (10) and takes the front axle (5) as the center; the driving wheel (20) is fixed on the output shaft of the driving motor and located in the circular groove.

6. The multi-chemical conversion rotary finger fumator according to claim 1 or 2, wherein: The front end of the rear axle (4) is connected with the rear end of the front axle (5) through the pin shaft (17).

7. The multi-chemical conversion rotary finger fumator according to claim 1 or 2, wherein: The rear side of the rear support (1) is fixed with the tail handle (15), and the side handle (16) is fixed on the side of the rear support.

Images