Physical evidence extraction device based on fire scene partition
By designing a fire scene zoning evidence extraction device, which utilizes the coordinated operation of cam drive and air blowing components, efficient hierarchical screening and separation of fire scene evidence is achieved. This solves the problems of low evidence extraction efficiency and adhesion in existing technologies, and improves analysis efficiency.
Patent Information
- Application Number
- CN202520798052.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-25
AI Technical Summary
Existing technologies are inefficient at extracting physical evidence from fire scenes, and the evidence tends to stick to the ash, making analysis difficult and consuming a lot of manpower and time.
Design an evidence extraction device based on fire scene zoning, comprising a shell, drawer, metal filter screen and blowing assembly. Through the coordinated work of cam drive and blowing assembly, the device can achieve graded screening and separation of evidence.
It improved the efficiency of physical evidence extraction, reduced manpower consumption, prevented physical evidence from sticking to ashes, and simplified the subsequent analysis process.
Smart Images
Figure CN223862304U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire scene evidence extraction technology, specifically to an evidence extraction device based on fire scene zoning. Background Technology
[0002] After a fire breaks out, the area where the fire started suffers the most severe burns, and combustible materials are reduced to ash. In current fire investigation equipment, large amounts of ash are mostly cleared using tools such as shovels, rakes, and brushes. This often requires a huge amount of manpower and time, and it is not possible to quickly extract large, medium, small, or minute evidence from different fire zones. This results in low efficiency in the extraction of evidence from fire zones. Furthermore, water spraying and other methods can easily leave water stains in the fire zone, causing ash to adhere to the evidence, which is not conducive to subsequent analysis of the evidence.
[0003] To address this, a physical evidence extraction device based on fire scene zoning is proposed. Utility Model Content
[0004] The purpose of this utility model is to provide a physical evidence extraction device based on fire scene zoning in order to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:
[0006] A physical evidence extraction device based on fire scene zoning includes a housing with an open bottom surface. At least three drawers are slidably mounted inside the housing via slide rails, and each drawer has an elastic connecting component on its inner wall. Metal filter screens are slidably mounted inside each drawer via the elastic connecting components. The mesh diameter of the multiple metal filter screens decreases sequentially from top to bottom. A cam drive component is provided on the housing to drive the metal filter screens to vibrate vertically. A blowing component is provided on the top surface of the housing, and feeding hoppers are provided on both sides of the top surface of the housing and on the sides of the blowing component.
[0007] Furthermore, rollers are rotatably mounted on both sides of the outer casing, and the bottom surface of the outer casing forms an elevated structure with the ground via the rollers.
[0008] Furthermore, the front side wall of the feed hopper is provided with a through groove, and a baffle is movably inserted into the through groove. When the baffle is fully inserted into the through groove, it forms a blockage inside the feed hopper to accumulate physical evidence extracted from the fire scene. The physical evidence extracted from the fire scene is then pulled out from the through groove through the baffle and enters the outer shell.
[0009] Furthermore, the blower assembly includes an air inlet channel fixedly installed at the air inlet at the top of the housing, and a motor mounting bracket is fixedly installed on the inner wall of the air inlet channel. A first motor is fixedly installed on the top surface of the motor mounting bracket, and a fan blade is fixedly installed through the motor mounting bracket at the output end of the first motor.
[0010] Furthermore, the elastic connection assembly includes a protruding plate fixedly installed at the corner of the inner wall of the drawer, and a guide rod fixedly installed on the bottom surface of the protruding plate. The metal filter screen is slidably installed on the inner wall of the drawer and the surface of the guide rod, and a spring is fixedly connected to the top surface of the metal filter screen and the bottom surface of the protruding plate.
[0011] Furthermore, the cam drive assembly includes rotating shafts that are rotatably inserted into the left and right side walls of the housing, and the number of rotating shafts is equal to the number of drawers, and they are located sequentially below the drawers. A cam body is fixedly installed on the surface of the rotating shaft, and the cam body is in contact with the bottom surface of the metal filter screen. A double-groove synchronous pulley is fixedly sleeved on the end face of each set of rotating shafts, and a synchronous belt is sleeved on the surface of adjacent double-groove synchronous pulleys. A second motor is fixedly installed on one side wall of the housing, and the output end of the second motor is fixedly connected to the end of one set of rotating shafts.
[0012] The beneficial effects of this utility model are as follows:
[0013] At least three sets of drawers are installed through the internal sliding rails of the bottom opening of the outer casing. The metal filter screen in each set of drawers has a mesh diameter that decreases from top to bottom, which facilitates the grading and screening of evidence of different sizes. The metal filter screen can be driven to vibrate vertically through the blowing assembly and the cam drive assembly, and the vibration helps to separate and screen the evidence on the screen. A feeding hopper is set on the top surface of the outer casing for feeding fire scene evidence, and air circulation is provided through the blowing assembly to facilitate airflow and assist in the screening and separation of evidence. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0015] Figure 2 This is a bottom view of the present invention;
[0016] Figure 3 This is a front sectional view of the present invention;
[0017] Figure 4 This is a schematic diagram of the drawer of this utility model;
[0018] Figure 5 This is a utility model Figure 4 Enlarged view of part A;
[0019] Reference numerals: 1. Outer shell; 2. Roller; 3. Feed hopper; 31. Through groove; 32. Baffle; 4. Blowing assembly; 401. Air inlet channel; 402. Motor mounting bracket; 403. First motor; 404. Fan blade; 5. Drawer; 6. Elastic connection assembly; 601. Protruding plate; 602. Guide rod; 603. Spring; 7. Metal filter screen; 8. Cam drive assembly; 801. Rotating shaft; 802. Cam body; 803. Double groove synchronous pulley; 804. Synchronous belt; 805. Second motor. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0022] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0023] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] like Figures 1 to 5As shown, a physical evidence extraction device based on fire scene zoning includes a housing 1 with an open bottom surface. At least three sets of drawers 5 are slidably installed inside the housing 1 via slide rails. The inner wall of each drawer 5 is provided with an elastic connecting component 6. Metal filter screens 7 are slidably installed inside each drawer 5 via the elastic connecting component 6. The mesh diameter of the multiple sets of metal filter screens 7 decreases sequentially from top to bottom. A cam drive component 8 is provided on the housing 1, which drives the metal filter screens 7 to vibrate vertically. A blowing component 4 is provided on the top surface of the housing 1, and feeding hoppers 3 are provided on both sides of the blowing component 4 on the top surface of the housing 1. More specifically, at least three sets of drawers 5 are installed on the internal slide rails of the bottom opening of the outer casing 1. The metal filter screen 7 in each set of drawers 5 has a mesh diameter that decreases from top to bottom, which facilitates the grading and screening of evidence of different sizes. The metal filter screen 7 can be driven to shake vertically by the blowing assembly 4 and the cam drive assembly 8, and the evidence is separated and screened on the screen by means of vibration. The top surface of the outer casing 1 is provided with a feeding hopper 3 for feeding fire scene evidence, and the blowing assembly 4 provides air circulation to facilitate airflow and assist in the screening and separation of evidence.
[0025] Rollers 2 are rotatably mounted on both side walls of the outer casing 1, and the bottom surface of the outer casing 1 is suspended from the ground via the rollers 2. More specifically, the rollers 2 allow the device to be easily moved on the ground at the fire scene, while the suspended structure facilitates the discharge of screened dust.
[0026] The front side wall of the feed hopper 3 has a through groove 31, and a baffle 32 is movably inserted into the through groove 31. When the baffle 32 is fully inserted into the through groove 31, it blocks the interior of the feed hopper 3, which is used to accumulate evidence extracted from the fire scene. The evidence extracted from the fire scene can then be pulled out of the through groove 31 through the baffle 32 and enter the outer shell 1. More specifically, when the baffle 32 is fully inserted into the through groove 31, it can prevent evidence from entering the interior of the outer shell 1, which facilitates the accumulation of evidence extracted from the fire scene when needed. When evidence needs to enter the outer shell 1, the baffle 32 is pulled out, and the evidence extracted from the fire scene can then enter the outer shell 1 through the feed hopper 3 for subsequent screening.
[0027] The blower assembly 4 includes an air inlet channel 401 fixedly installed at the air inlet at the top of the outer casing 1. A motor mounting bracket 402 is fixedly installed on the inner wall of the air inlet channel 401. A first motor 403 is fixedly installed on the top surface of the motor mounting bracket 402, and a fan blade 404 is fixedly installed through the motor mounting bracket 402 at the output end of the first motor 403. More specifically, the fan blade 404 is driven to rotate by the first motor 403, generating airflow. The airflow enters the outer casing 1 through the air inlet channel 401. The airflow impacts the surface of the metal filter screen 7, causing the metal filter screen 7 to vibrate under the action of the elastic connecting assembly 6. At the same time, the airflow can disperse the ash in the fire scene evidence, assisting in the separation and screening of the evidence.
[0028] The elastic connecting component 6 includes a protruding plate 601 fixedly installed at the corner of the inner wall of the drawer 5, and a guide rod 602 fixedly installed on the bottom surface of the protruding plate 601. The metal filter screen 7 is slidably installed on the inner wall of the drawer 5 and the surface of the guide rod 602, and a spring 603 is fixedly connected to the top surface of the metal filter screen 7 and the bottom surface of the protruding plate 601. More specifically, the spring 603 provides elastic support for the metal filter screen 7, so that it can shake up and down when impacted and vibrated by the airflow of the blowing component 4, thereby enhancing the screening effect of the evidence on the screen. When the cam drive component 8 drives the metal filter screen 7 to move vertically in the drawer 5, the elastic connecting component 6 moves along the inner wall of the drawer 5 and the surface of the guide rod 602, compressing the spring 603, and the metal filter screen 7 is reset by the elastic force of the spring 603.
[0029] The cam drive assembly 8 includes rotating shafts 801 that are rotatably inserted into the left and right side walls of the housing 1. The number of rotating shafts 801 is equal to the number of drawers 5, and they are located below the drawers 5 in sequence. A cam body 802 is fixedly installed on the surface of the rotating shaft 801, and the cam body 802 is in contact with the bottom surface of the metal filter screen 7. A double-groove synchronous wheel 803 is fixedly sleeved on the end face of each set of rotating shafts 801. A synchronous belt 804 is sleeved on the surface of adjacent double-groove synchronous wheels 803. A second motor 805 is fixedly installed on one side wall of the housing 1. The output end of the second motor 805 is fixedly connected to the end of one set of rotating shafts 801. More specifically, the second motor 805 drives the rotating shaft 801 to rotate, and the cam body 802 rotates accordingly. The contour of the cam body 802 continuously lifts and releases the metal filter screen 7, realizing the vertical shaking of the screen and promoting the screening of physical evidence. The synchronous belt 804 and the double-groove synchronous pulley 803 ensure the synchronous rotation of multiple sets of rotating shafts 801, so that the metal filter screen 7 in each drawer 5 shakes in a consistent manner, thereby improving the efficiency and effectiveness of physical evidence screening.
[0030] In summary: The bottom opening of the outer casing 1 has at least three sets of drawers 5 installed on the internal slide rails. The metal filter screen 7 in each set of drawers 5 has a mesh diameter that decreases from top to bottom, which facilitates the grading and screening of evidence of different sizes. The metal filter screen 7 can be driven to shake vertically by the blowing assembly 4 and the cam drive assembly 8, and the evidence is separated and screened on the screen by means of vibration. The top surface of the outer casing 1 is provided with a feeding hopper 3 for feeding fire scene evidence, and the blowing assembly 4 provides air circulation to facilitate airflow and assist in the screening and separation of evidence.
[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A device for extracting physical evidence based on fire scene zoning, characterized in that, The shell (1) includes an outer shell (1) with an open bottom surface. At least three drawers (5) are slidably installed inside the shell (1) via slide rails. The inner wall of each drawer (5) is provided with an elastic connecting component (6). A metal filter screen (7) is slidably installed inside the drawer (5) via the elastic connecting component (6). The mesh diameter of the multiple metal filter screens (7) decreases sequentially from top to bottom. A cam drive component (8) is provided on the outer shell (1). The metal filter screen (7) is driven to shake vertically by the cam drive component (8). A blower component (4) is provided on the top surface of the outer shell (1). A feed hopper (3) is provided on both sides of the blower component (4) on the top surface of the outer shell (1).
2. The evidence extraction device based on fire scene zoning according to claim 1, characterized in that, Rollers (2) are rotatably installed on both sides of the outer shell (1), and the bottom surface of the outer shell (1) forms an overhead structure with the ground via the rollers (2).
3. The evidence extraction device based on fire scene zoning according to claim 1, characterized in that, The front side wall of the feed hopper (3) is provided with a through groove (31), and a baffle (32) is movably inserted into the through groove (31). When the baffle (32) is fully inserted into the through groove (31), it forms a blockage inside the feed hopper (3) for accumulating physical evidence extracted from the fire scene. The physical evidence extracted from the fire scene is then pulled out from the through groove (31) through the baffle (32) and enters the outer shell (1).
4. The evidence extraction device based on fire scene zoning according to claim 1, characterized in that, The blower assembly (4) includes an air inlet channel (401) fixedly installed at the air inlet at the top of the housing (1), and a motor mounting bracket (402) is fixedly installed on the inner wall of the air inlet channel (401). A first motor (403) is fixedly installed on the top surface of the motor mounting bracket (402), and a fan blade (404) is fixedly installed through the motor mounting bracket (402) at the output end of the first motor (403).
5. The evidence extraction device based on fire scene zoning according to claim 1, characterized in that, The elastic connection assembly (6) includes a protruding plate (601) fixedly installed at the corner of the inner wall of the drawer (5), and a guide rod (602) is fixedly installed on the bottom surface of the protruding plate (601). The metal filter screen (7) is slidably installed on the inner wall of the drawer (5) and the surface of the guide rod (602), and a spring (603) is fixedly connected to the top surface of the metal filter screen (7) and the bottom surface of the protruding plate (601).
6. The evidence extraction device based on fire scene zoning according to claim 1, characterized in that, The cam drive assembly (8) includes a rotating shaft (801) that is rotatably inserted into the left and right side walls of the outer casing (1). The number of rotating shafts (801) is equal to the number of drawers (5) and they are located below the drawers (5) in sequence. A cam body (802) is fixedly installed on the surface of the rotating shaft (801), and the cam body (802) is in contact with the bottom surface of the metal filter screen (7). A double-groove synchronous wheel (803) is fixedly sleeved on the end face of each set of rotating shafts (801). A synchronous belt (804) is sleeved on the surface of adjacent double-groove synchronous wheels (803). A second motor (805) is fixedly installed on one side wall of the outer casing (1). The output end of the second motor (805) is fixedly connected to the end of one set of rotating shafts (801).