A device for extracting physical evidence

Abstract

The present application discloses a physical evidence extraction device, which includes a telescopic assembly and a sampling tube assembly. The telescopic assembly includes a telescopic joint, a matching tube, a top block, a first elastic member, a drawstring, a roller and a bracket; the sampling tube assembly includes a sampling tube, a slider, a second elastic member, a cover and a sealing ring. The extraction device of the present application can adjust the length through the telescopic joint to facilitate evidence collection at a position that cannot be reached by human hands. During the entire evidence collection work, human hands do not touch the cotton swab, which can ensure the accuracy of the sample. At the same time, when working in a small space, when the sampling tube is extended into the space or withdrawn from the small space, the cotton swab is protected in the sampling tube, which can avoid the risk of contamination. After the evidence collection work is completed, the physical evidence sample can be transferred together with the sampling tube assembly, and the closed sampling tube can also ensure that the sample is not contaminated during the transfer process.

Description

Technical Field

[0001] The present application relates to the field of evidence extraction equipment, and in particular to a device for extracting physical evidence. Background Art

[0002] The discovery and extraction of physical evidence is an important task in case scene investigation in public security practice. Due to different on-site environments, the locations of physical evidence are also different. Some physical evidence is located in relatively fixed and small spaces at the scene, such as narrow gaps, deep objects, etc. The cotton swab wiping, tweezers clamping and other methods commonly used in current practical work cannot reach the physical evidence in these small spaces, resulting in the loss of physical evidence and failure to play its key evidentiary role.

[0003] In the prior art, some evidence collection devices with telescopic functions can only be used to collect trace evidence, but not for the extraction of biological evidence. On the other hand, when collecting evidence in a small space, it is necessary to avoid contamination of the cotton swab head by external objects to ensure the accuracy of the sample. Utility Model Content

[0004] The embodiment of the present application provides a physical evidence extraction device that can adapt to physical evidence extraction in a narrow space and can prevent the extracted physical evidence from being contaminated by the external environment.

[0005] The present application embodiment discloses a device for extracting physical evidence, including:

[0006] The telescopic assembly comprises a telescopic joint, a matching cylinder, a top block, a first elastic member and a drawstring; the telescopic joint can adjust the length; the matching cylinder is arranged at the end of the telescopic joint; the top block is slidably arranged in the matching cylinder along the axial direction of the matching cylinder; the first elastic member is arranged between the matching cylinder and the top block, and is used to drive the top block to slide to the outside of the matching cylinder; one end of the drawstring is connected to the top block, and is used to pull the top block to move;

[0007] The sampling barrel assembly comprises a sampling barrel, a slider, a second elastic member and a sealing cover; the sampling barrel comprises a mounting section and a sliding hole section along its axial direction; the mounting section is coaxially sleeved on the matching barrel; the slider is slidably arranged in the sliding hole section along the axial direction of the sampling barrel, and a wiping member for sampling is arranged on the side of the slider away from the mounting section; the second elastic member is arranged between the slider and the sampling barrel, the second elastic member is used to drive the slider to move toward the mounting section and the elastic force of the second elastic member is less than the elastic force of the first elastic member; the sealing cover is arranged on the port of the sliding hole section away from the mounting section.

[0008] The physical evidence extraction device of the present application has at least the following beneficial effects:

[0009] The extraction device of the present application includes a telescopic assembly and a sampling barrel assembly. The telescopic assembly includes a telescopic joint, a matching barrel, a top block, a first elastic member, and a drawstring rope; the sampling barrel assembly includes a sampling barrel, a slider, a second elastic member, and a cover. When evidence collection is required, first adjust the length of the telescopic joint to an ideal state, then tighten the drawstring rope so that the top block retracts into the matching barrel, and then install the sampling barrel assembly on the matching barrel. After manually operating the telescopic joint and driving the sampling barrel assembly to extend to a predetermined position, by loosening the drawstring rope, the top block extends outward under the action of the first elastic member and pushes the wiping member (cotton swab) on the slider to the outside of the sampling barrel. After the staff operates the cotton swab to wipe the sample, they tighten the drawstring rope again so that the cotton swab returns to the sampling barrel. After sampling is completed, the sampling barrel is sealed with a cover. In the present application, the length can be adjusted by the telescopic joint to facilitate evidence collection in places that cannot be reached by human hands. During the entire evidence collection work, human hands do not touch the cotton swab, which can ensure the accuracy of the sample. At the same time, when working in a small space, the cotton swab is protected in the sampling tube when the sampling tube is extended into the space or withdrawn from the small space, which can avoid the risk of contamination. After the evidence collection work is completed, the physical evidence sample can be transferred together with the sampling tube assembly, and the closed sampling tube can also ensure that the sample is not contaminated during the transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0011] Figure 1 is a schematic diagram of the structure of an extraction device according to an embodiment of the present application;

[0012] Figure 2 yes Figure 1 Schematic cross-sectional view of ;

[0013] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0014] Figure 4 is a partial schematic diagram of the sleeve and the elastic protrusion;

[0015] Figure 5 It is a structural schematic diagram of the matching cylinder;

[0016] Figure 6 It is a schematic diagram of the structure of the roller and the bracket;

[0017] Figure 7 yes Figure 1 A schematic diagram of the structure of the sampling tube assembly;

[0018] Figure 8 yes Figure 7 Schematic cross-sectional view of ;

[0019] The description of the reference numerals is as follows: 10, telescopic assembly; 11, telescopic joint; 11a, sleeve; 11b, positioning hole; 11c, elastic protrusion;

[0020] 12. Matching cylinder; 12a. Ring groove; 12b. Second guide groove; 13. Top block; 14. First elastic member;

[0021] 15. Retracting rope; 16. Roller; 17. Bracket; 18. Damping shaft;

[0022] 20. Sampling cylinder assembly; 21. Sampling cylinder; 211. Mounting section; 211a. Second guide protrusion; 211b. Step surface; 212. Sliding hole section; 2121. Equal diameter section; 2122. Cone section; 213. Partition plate; 22. Sliding block; 221. Large diameter shaft; 222. Small diameter shaft; 22a. Sealing groove; 23. Second elastic member; 24. Cover; 25. Sealing ring;

[0023] 30. Cotton swab. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] like Figures 1 to 3As shown, an embodiment of the present application discloses a device for extracting physical evidence, which includes a telescopic assembly 10 and a sampling barrel assembly 20. The telescopic assembly 10 includes a telescopic joint 11, a matching barrel 12, a top block 13, a first elastic member 14, a pull rope 15, a roller 16 and a bracket 17; the sampling barrel assembly 20 includes a sampling barrel 21, a slider 22, a second elastic member 23, a cover 24 and a sealing ring 25.

[0027] The telescopic joint 11 includes at least two (three are shown in the embodiment of the present application) sleeves 11a, and the multiple sleeves 11a are coaxially sleeved inside and outside in sequence. Two adjacent sleeves 11a can slide relative to each other along their axial direction, thereby adjusting the overall length.

[0028] like Figure 4 As shown, among the two radially adjacent sleeves 11a, a positioning hole 11b is provided on the outer circumferential wall of one sleeve 11a, and an elastic protrusion 11c (such as an elastic bead, etc.) is provided on the outer circumferential wall of the other sleeve 11a. The elastic protrusion 11c can be radially extended and retracted in the sleeve 11a. When the elastic protrusion 11c is inserted into the positioning hole 11b, no relative movement can occur between the two radially adjacent sleeves 11a. In some preferred schemes, a plurality of positioning holes 11b are arranged at intervals along the axial direction of the sleeve 11a, so that the telescopic joint 11 can be fixed at different required lengths.

[0029] Among the two radially adjacent sleeves 11a, a first guide groove (not shown) is provided on the inner circumferential wall of one sleeve 11a, and the length direction of the first guide groove is consistent with the axial direction of the sleeve 11a. A first guide protrusion (not shown) is provided on the outer circumferential wall of the other sleeve 11a, and the first guide protrusion is slidably arranged in the first guide groove. Through the cooperation of the first guide protrusion and the first guide groove, the two adjacent sleeves 11a can only slide relative to each other in their axial direction, and cannot rotate relative to each other in the circumferential direction, thereby improving the stability of the structure.

[0030] In the embodiment of the present application, the telescopic joint 11 is in the form of a hollow multi-stage sleeve 11a, which is light in weight and easy to store and carry.

[0031] like Figure 5 As shown, the matching tube 12 is coaxially arranged on the end surface of the sleeve 11a, and the matching tube 12 is connected to the inside of the sleeve 11a, wherein the matching tube 12 is arranged on the end surface of the innermost sleeve 11a, and when adjusting the length, the matching tube 12 can be adjusted to the end farthest from the human hand, so as to facilitate the use of the sampling tube assembly 20 on the matching tube 12 for biological sampling. The sampling tube 21 can be coaxially installed on the outer periphery of the matching tube 12, and the installation method is, for example, as shown in FIG. Figure 5 and Figure 7As shown: an annular groove 12a coaxial with the matching cylinder 12 is provided on the outer circumference of the matching cylinder 12, and a second guide groove 12b is also provided on the outer circumference of the matching cylinder 12. The length direction of the second guide groove 12b is consistent with the axial direction of the matching cylinder 12, one end of the second guide groove 12b is connected to the end face of the matching cylinder 12 (an end face of the sleeve 11a away from the axial direction thereof), and the other end of the second guide groove 12b is connected to the annular groove 12a; a second guide protrusion 211a is provided on the inner circumference of the sampling cylinder 21 (specifically, the mounting section 211 of the sampling cylinder 21). When the sampling cylinder 21 needs to be installed on the matching cylinder 12, the second guide protrusion 211a is aligned with the second guide groove 12b and slides into the second guide groove 12b. When the second guide protrusion 211a slides into the annular groove 12a, the sampling cylinder 21 is rotated so that the second guide protrusion 211a and the second guide groove 12b are circumferentially misaligned, and the installation of the sampling cylinder 21 can be completed. In addition, the sampling tube 21 in the embodiment of the present application can also be connected to the matching tube 12 by magnetic attraction or snap connection.

[0032] See also Figure 3 The top block 13 is coaxially arranged inside the matching cylinder 12, and the top block 13 can slide along the axial direction of the matching cylinder 12. The top block 13 is used to push the wiping piece in the sampling cylinder 21 out of the sampling cylinder 21 to facilitate sampling. In the embodiment of the present application, the wiping piece is configured as a cotton swab 30. Of course, the wiping piece can also be other components that can collect biological information.

[0033] See also Figure 3 , the first elastic member 14 is configured as a spring, and the first elastic member 14 is coaxially installed in the matching tube 12, wherein a stop surface (not shown) is provided in the matching tube 12, one end of the first elastic member 14 abuts against the stop surface, and the other end abuts against the top block 13, and the expansion and contraction direction of the first elastic member 14 is consistent with the axial direction of the matching tube 12. When the first elastic member 14 is not subjected to external force, the first elastic member 14 can push one end of the top block 13 along the axial direction of the matching tube 12 to the outside of the matching tube 12 (specifically, the side away from the sleeve 11a). When the tension rope 15 is tightened and the top block 13 is pulled to compress the first elastic member 14, the top block 13 can be retracted into the matching tube 12. Among them, the elastic force of the first elastic member 14 is greater than the elastic force of the second elastic member 23. In this way, when the first elastic member 14 indirectly pushes the slider 22, the first elastic member 14 can overcome the elastic force of the second elastic member 23 and then push the slider 22.

[0034] See also Figure 2The retracting rope 15 is located in the multiple sleeves 11a of the telescopic joint 11, one free end of the retracting rope 15 is connected to the top block 13, and the other free end of the retracting rope 15 passes through the small hole on the sleeve 11a (located on the outermost sleeve 11a) and is connected to the outer circumference of the roller 16. When the roller 16 rotates, the retracting rope 15 can be reeled and unreeled, and then the top block 13 can be pulled back into the matching tube 12 or released to the outside of the matching tube 12. The retracting rope 15 can be a steel wire rope, etc.

[0035] See also Figure 6 The roller 16 is rotatably disposed on the outer peripheral wall of the sleeve 11a (the outermost sleeve 11a) through a bracket 17. Specifically, the bracket 17 is fixedly disposed on the outer peripheral wall of the sleeve 11a, and the roller 16 is rotatably disposed on the bracket 17. The staff can manually rotate the roller 16 to adjust the tension of the pull rope 15, so as to control the extended length of the top block 13, and realize stepless adjustment of the length of the cotton swab 30 pushed out of the sampling tube 21.

[0036] In some preferred embodiments, see Figure 6 The roller 16 and the bracket 17 are rotatably connected via a damping shaft 18, and the damping shaft 18 can increase the resistance of the roller 16 when it rotates relative to the bracket 17. In the embodiment of the present application, since the first elastic member 14 has an elastic force to push the top block 13 outward, and when the top block 13 does not need to be extended, the top block 13 needs to be pulled by the pull rope 15, therefore, the rotation of the roller 16 is designed to be a damped rotation, which can save the force required when a person manually pulls the top block 13, so as to achieve a labor-saving and convenient operation effect.

[0037] See also Figure 8 The interior of the sampling tube 21 is a hollow structure. The sampling tube 21 is divided into a mounting section 211 and a sliding hole section 212 that are interconnected along its axial direction. The mounting section 211 is coaxially mounted on the outer periphery of the matching tube 12, and the inner diameter of the mounting section 211 is equal to the outer diameter of the matching tube 12. In the embodiment of the present application, a second guide protrusion 211a is provided on the inner peripheral wall of the mounting section 211. The second guide protrusion 211a can cooperate with the second guide groove 12b and the annular groove 12a on the matching tube 12, thereby realizing the installation of the sampling tube 21 on the matching tube 12. The installation method is convenient and can be quickly operated. Among them, the length of the second guide groove 12b is less than the axial length of the mounting section 211, so that when the sampling tube 21 is installed, the matching tube 12 will not touch the slider 22 in the sliding hole section 212.

[0038] See also Figure 8, a partition 213 is arranged in the slide hole section 212, and the partition 213 divides the slide hole section 212 into an equal diameter section 2121 and a conical section 2122 which are interconnected along its axial direction. A through hole is arranged on the partition 213, and at least part of the slider 22 passes through the through hole. Among them, the equal diameter section 2121 is connected with the mounting section 211, and the inner diameter of the mounting section 211 is smaller than the inner diameter of the equal diameter section 2121, and a step surface 211b can be formed between the mounting section 211 and the equal diameter section 2121. In the embodiment of the present application, the conical section 2122 can reduce the space occupied by the front end of the sampling tube 21, so as to adapt to the sampling work in a narrow space.

[0039] See also Figure 8 The overall shape of the slider 22 is a stepped shaft shape, that is, the slider 22 includes a large diameter shaft 221 and a small diameter shaft 222. The outer diameter of the large diameter shaft 221 is equal to the inner diameter of the equal diameter section 2121, so that the outer circumference of the slider 22 can be in close contact with the inner cylinder of the equal diameter section 2121. The small diameter shaft 222 of the slider 22 is inserted into the through hole of the partition 213, and the cotton swab 30 is inserted into the small diameter shaft 222 of the slider 22.

[0040] In some preferred embodiments, see Figure 8 A sealing groove is provided on the large diameter shaft 221 of the slider 22 , and a sealing ring 25 is provided in the sealing groove. The sealing ring 25 is used for sealing between the large diameter shaft 221 and the inner peripheral wall of the equal diameter section 2121 .

[0041] See also Figure 8 The second elastic member 23 is configured as a spring. The second elastic member 23 is coaxially arranged in the equal diameter section 2121, and one end of the second elastic member 23 abuts against the slider 22, and the other end abuts against the partition 213. The extension direction of the second elastic member 23 is configured as the axial direction of the sampling tube 21. When the second elastic member 23 is not subjected to external force, the second elastic member 23 can press the large diameter shaft 221 of the slider 22 tightly against the step surface 211b, and can block one side of the sampling tube 21, while the opening of the tapered section 2122 of the sampling tube 21 is blocked by the sealing cover 24, so that a closed space can be formed inside the sampling tube 21 to ensure that the cotton swab 30 is not contaminated.

[0042] See also Figure 8 The cover 24 is connected to the conical section 2122 of the sampling tube 21, and the cover 24 can block the port of the conical section 2122 (a port away from the sleeve 11a) to ensure that the cotton swab 30 is not contaminated, wherein the connection between the cover 24 and the conical section 2122 can be a detachable connection such as a magnetic connection, a snap connection, etc.

[0043] A working method of the extraction device in the embodiment of the present application is as follows:

[0044] 1. Adjust the length of the telescopic joint 11 according to the sampling position, and then manually operate the roller 16 to rotate so that the pull rope 15 retracts the top block 13 into the matching tube 12;

[0045] 2. Align the second guide protrusion 211a on the sampling tube 21 (the cotton swab 30 is already installed in the sampling tube 21) with the second guide groove 12b, and sleeve the sampling tube 21 on the matching tube 12 while the second guide protrusion 211a slides into the second guide groove 12b. When the second guide protrusion 211a slides into the annular groove 12a, rotate the sampling tube 21 by a certain angle so that the second guide protrusion 211a is misaligned with the second guide groove 12b. At this time, the sampling tube 21 is coaxially installed on the matching tube 12, and then the cover 24 of the sampling tube 21 is opened;

[0046] 3. The staff holds the telescopic joint 11 and extends the sampling tube 21 to the vicinity of the sampling position. Then the staff manually operates the roller 16 to rotate, and the drawstring 15 is gradually unwound. Under the action of the first elastic member 14, the top block 13 extends out of the matching tube 12 and extends into the sampling tube 21 to abut against the slider 22 in the sampling tube 21. Since the elastic force of the first elastic member 14 is greater than the elastic force of the second elastic member 23, the top block 13 pushes the slider 22 to slide in the sampling tube 21, and the slider 22 drives the cotton swab 30 to extend to the outside of the sampling tube 21. When the extension margin of the top block 13 is completely used up, the cotton swab head of the cotton swab 30 is also outside the sampling tube 21. At this time, the staff holds the telescopic joint 11 to operate, so that the cotton swab 30 wipes the sample at the sampling position to achieve sampling.

[0047] 4. After wiping the sample, the staff operates the roller 16 to rotate, and the pull rope 15 pulls the top block 13 back into the matching tube 12. At the same time, the cotton swab 30 that has taken the sample is also retracted into the sampling tube 21 along with the slider 22 under the drive of the second elastic member 23. After the staff retracts the sampling tube 21, the sampling tube 21 is removed from the matching tube 12 and then sealed with the cover 24. At this time, the evidence extraction work is completed, and only the sampling tube 21 and the cotton swab 30 inside need to be transferred to the laboratory for testing.

[0048] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A device for extracting physical evidence, characterized in that: include: A telescopic assembly (10) comprises a telescopic joint (11), a matching tube (12), a top block (13), a first elastic member (14) and a drawstring rope (15); the telescopic joint (11) is capable of adjusting the length; the matching tube (12) is arranged at the end of the telescopic joint (11); the top block (13) is slidably arranged in the matching tube (12) along the axial direction of the matching tube (12); the first elastic member (14) is arranged between the matching tube (12) and the top block (13) and is used to drive the top block (13) to slide to the outside of the matching tube (12); one end of the drawstring rope (15) is connected to the top block (13) and is used to pull the top block (13) to move; A sampling cylinder assembly (20) comprises a sampling cylinder (21), a sliding block (22), a second elastic member (23) and a sealing cover (24); the sampling cylinder (21) comprises a mounting section (211) along its axial direction. and a sliding hole section (212); the mounting section (211) is coaxially sleeved on the matching cylinder (12); the slider (22) is slidably arranged in the sliding hole section (212) along the axial direction of the sampling cylinder, and a wiping member for sampling is arranged on a side of the slider (22) away from the mounting section (211); a second elastic member (23) is arranged between the slider (22) and the sampling cylinder (21), the second elastic member (23) is used to drive the slider (22) to move toward the mounting section (211), and the elastic force of the second elastic member (23) is smaller than the elastic force of the first elastic member (14); the sealing cover (24) is arranged on the end of the sliding hole section (212) away from the mounting section (211).

2. The device for extracting physical evidence according to claim 1, characterized in that: The telescopic joint (11) comprises a plurality of sleeves (11a) sequentially arranged inside and outside each other, wherein one sleeve (11a) of two adjacent sleeves (11a) is provided with a positioning hole (11b), and the other sleeve (11a) is provided with an elastic protrusion (11c), and the elastic protrusion (11c) can be engaged in the positioning hole (11b) to achieve the limitation of the relative positions of the two sleeves (11a); the matching tube (12) is arranged at the end of the sleeve (11a) located at the innermost side.

3. The device for extracting physical evidence according to claim 2, characterized in that: The sleeve (11a) is provided with a plurality of positioning holes (11b) at intervals along its axial direction.

4. The device for extracting physical evidence according to claim 3, characterized in that: Of the two adjacent sleeves (11a), one sleeve (11a) is provided with a first guide groove along its axial direction, and the other sleeve (11a) is provided with a first guide protrusion, which is arranged in the first guide groove.

5. The device for extracting physical evidence according to any one of claims 1 to 4, characterized in that: The telescopic assembly (10) further comprises a roller (16), wherein the roller (16) is rotatably arranged on the telescopic joint (11) via a bracket (17), and one end of a retracting rope (15) is connected to the outer circumference of the roller (16), and the other end is connected to the top block (13).

6. The device for extracting physical evidence according to claim 5, characterized in that: The roller (16) and the bracket (17) are rotatably connected via a damping shaft (18).

7. The device for extracting physical evidence according to claim 1, characterized in that: The outer circumference of the matching cylinder (12) is provided with an annular groove (12a) along its circumferential direction and a second guide groove (12b) along its axial direction, one end of the second guide groove (12b) is connected to the end surface of the matching cylinder (12), and the other end is connected to the annular groove (12a); the inner circumference of the mounting section (211) is provided with a second guide protrusion (211a), and the second guide protrusion (211a) can be guided into the annular groove (12a) along the second guide groove (12b).

8. The device for extracting physical evidence according to claim 7, characterized in that: The inner diameter of the mounting section (211) is equal to the outer diameter of the matching cylinder (12).

9. The physical evidence extraction device according to claim 7 or 8, characterized in that: The outer circumference of the slider (22) is in close contact with the inner circumference of the sliding hole section (212), and a step surface (211b) is formed between the sliding hole section (212) and the mounting section (211), and the end surface of the slider (22) is in close contact with the step surface (211b).

10. The device for extracting physical evidence according to claim 9, characterized in that: A sealing groove is arranged on the outer circumference of the sliding block (22), and a sealing ring (25) is arranged in the sealing groove.

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