CN112033720B - Crime scene sampling device and evidence viewing device - Google Patents
Crime scene sampling device and evidence viewing device Download PDFInfo
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- CN112033720B CN112033720B CN202010896220.2A CN202010896220A CN112033720B CN 112033720 B CN112033720 B CN 112033720B CN 202010896220 A CN202010896220 A CN 202010896220A CN 112033720 B CN112033720 B CN 112033720B
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- guide rail
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention relates to a crime scene sampling device and a evidence observation device, which comprise a sampling ball and a bracket; the surface of the sampling ball is a weak-viscosity adhesive layer; the bracket is of a semicircular arc structure; one end of the bracket is positioned above the other end; the bracket comprises a fixed part and a sliding part, and the sliding part is slidably arranged on the fixed part; the first connecting rod is rotatably connected with one end of the sliding part of the bracket, the second connecting rod is rotatably connected with the other end of the sliding part of the bracket, and the sampling ball rotates by rotating the first connecting rod or the second connecting rod; the sliding part slides along the fixing part to drive the sphere center of the sampling sphere to revolve around the circle center of the semicircular arc of the bracket. Adopt above-mentioned sampling device can directly observe the evidence sample, avoid the transfer of evidence, have bigger observation area simultaneously, improved observation efficiency.
Description
Technical Field
The invention relates to the field of sample collection devices at crime sites, in particular to a crime site sampling device and a evidence observation device.
Background
DNA technology is a mature and still ever-improving technology, and its use in forensic science is also of great importance. The acquisition of DNA samples is the origin of evidence, an important task for public security on-site investigation, and the difficulty is in the extraction of contact DNA.
Human shed cells are considered to be the primary source of contact DNA, including: the mucous membrane cells of the lips, the skin cells falling off from the palm side, and the skin cells on other parts of the face, etc., can be left on the surface of the on-site object by hands or other mediums. Trace intracellular genetic information can be obtained through more complex amplification and electrophoresis technology, and can be used as the comparison of the same identification and the kindred relation, and then the genetic information is in the forensic form. However, the technical bottleneck in the process from the detached cells to the forensic evidence is the technical problem of finding and extracting, and even preserving, namely how to accurately and perfectly transport the trace biological evidence on site to a laboratory. The prior art mainly adopts the means of wiping cotton swabs and other immature extraction means, and has poor effect on different material evidence materials. Currently, there are 2 problems with extracting DNA samples on site:
1) The common carrier of the exfoliated cells in the field is various, and most articles in life are manually operated, so that the exfoliated cells are supposed to exist on the surfaces of the articles theoretically, and the problem is that in the actual work of people, the selectable extraction targets are not more, and the detection rate is not high. The detection rate of the exfoliated cells is between 10% and 20% according to statistics. When a technical police surveys on site, the technical police find that the selectivity of the natural carrier such as cigarette ends and straws, which is more ideal, is abandoned for most articles; the problem is mainly caused by the limited size of the sampling tool, most of the material evidence needs to be transferred to the cotton swab and then to the carrier for microscope observation, so that the sample can enter the inspection system, and the loss of a small amount of sample is caused, so that the observable effective sample is greatly reduced.
2) The extraction method has large limitation, and the types of tools which can be selected are single. The observation under a microscope shows that the fiber of the cotton swab can be used for adsorbing and fixing the exfoliated cells well, and the fiber can perform well when releasing the cell core substances. However, the disadvantage is fatal, and the exfoliated cells are hardly extracted effectively for the evidence of surface roughness. In addition, the coverage area of the cotton swab head is only 0.4cm by 0.5cm, the phenomenon of 'erasing a blackboard' is easy to occur during on-site extraction, and a sample cannot be extracted effectively in a large area, which means that the existing extraction method has blindness, can be used for maintaining work in primary line work, and is further needed to be improved in operability.
3) The area of a single observation is limited, which increases the observation time of the sample. In the prior art, the exfoliated cells extracted from the cotton swab are required to be transferred to a carrier for microscopic observation, and the size of the carrier is limited, so that the observation efficiency is greatly reduced.
In summary, in the public security work of converting the exfoliated cells into evidence, the need of updating the concept and the method in the aspect of extraction is urgent, the defect is made up by means of a new device, the function of the DNA technology in forensic work is fully exerted, powerful technical support is provided for investigation, and scientific basis is provided for the sense of legal work.
Disclosure of Invention
The invention aims to provide a crime scene sampling device.
The technical scheme for solving the technical problems is as follows: a crime scene sampling device comprises a sampling ball and a bracket; the surface of the sampling ball is a weak-viscosity adhesive layer; the first connecting rod and the second connecting rod are fixedly arranged on the sampling ball and are positioned on the same axis of the sampling ball; the bracket is of a semicircular arc structure; the bracket comprises a fixed part and a sliding part, wherein the sliding part is slidably arranged on the fixed part; the first connecting rod is rotatably connected with one end of the sliding part of the bracket, the second connecting rod is rotatably connected with the other end of the sliding part of the bracket, and the first connecting rod or the second connecting rod rotates to drive the sampling ball to rotate; the sliding part slides along the fixing part to drive the sampling ball to revolve around the center of the semicircular arc of the bracket.
The beneficial effects of the invention are as follows: the sample ball can directly observe the evidence on the sample ball, and has a large enough observation area along with the rotation and revolution of the sample ball.
On the basis of the technical scheme, the invention can be improved as follows.
Further, a base is fixedly arranged on the fixing part of the bracket.
The beneficial effects of adopting the further scheme are as follows: the bracket can be fixed, and the stability during observation is ensured.
Further, the first connecting rod, the second connecting rod and the bracket are installed in an elastic mode.
The beneficial effects of adopting the further scheme are as follows: the sampling ball is convenient to install or detach.
Further, the fixing part of the bracket is a guide rail, and at least one end of the guide rail is an open end; the sliding part of the bracket is a rack; the guide rail and the rack are of semicircular arc structures, and the centers of the two are coincident; the guide rail is provided with a guide rail groove extending along the arc shape of the guide rail and guide rail side walls corresponding to the two sides of the guide rail groove; the rack is accommodated in the guide rail groove, and two side walls of the rack are in sliding abutting connection with the side walls of the guide rail; one side edge of the rack is slidably abutted with the bottom of the guide rail groove; a tooth part is arranged at the edge of the other side of the rack, and teeth of the tooth part face to a notch of the guide rail groove; edges on two sides of a notch of the guide rail groove extend towards the middle along the notch, and the rack is limited in the guide rail groove; gears are arranged between the edges of the two sides of the notch of the guide rail groove, and the shafts of the gears are rotatably arranged on the side walls of the guide rail; the gear is meshed with the tooth part; the shaft of the gear is rotated to drive the gear to rotate, so that the rack is driven to slide along the guide rail and extend out along the open end of the guide rail.
The beneficial effects of adopting the further scheme are as follows: the rack slides along the guide rail to drive the sphere center of the sampling ball to revolve around the circle center of the arc of the bracket, so that the range of the surface of the sampling ball which can be observed is between two regression lines of the sampling ball.
Further, one end of the shaft of the gear passes through the side wall of the guide rail and is provided with a first knob, and the first knob is positioned outside the side wall of the guide rail on one side; the first knob drives the gear to rotate.
The beneficial effects of adopting the further scheme are as follows: so that the rotation of the gear can be easily controlled.
Further, one end of the guide rail is a closed end, and the other end of the guide rail is an open end; one end of the rack is positioned in the guide rail groove and slides along the guide rail groove between the closed end and the open end of the guide rail; the other end is positioned outside the open end of the guide rail groove and moves away from or close to the open end of the guide rail groove along the circle where the rack is positioned.
The beneficial effects of adopting the further scheme are as follows: the rack can slide in or slide out of the guide rail from the open end, and the rack is prevented from sliding out of the closed end to block the observation sight.
Further, the rack slides at an angle of 120 °.
The beneficial effects of adopting the further scheme are as follows: the device can have stability while providing the sampling sphere with sufficient surface area to be observed.
Further, the two ends of the rack are respectively fixedly provided with a first bearing and a second bearing; the end part of the second connecting rod is provided with a connector; the first bearing is used for inserting and fixing the end part of the first connecting rod; the second bearing is used for inserting and fixing the end part of the second connecting rod, and the connector penetrates through the second bearing; and rotating the end part of the connector to drive the sampling ball to rotate.
The beneficial effects of adopting the further scheme are as follows: the sampling ball can rotate while revolving.
Further, the connector detachably mounts a second knob.
The beneficial effects of adopting the further scheme are as follows: the rotation of the sampling ball is easy to control.
The invention provides a evidence observation device, which comprises a sampling device and a microscope, wherein the sampling device is the crime scene sampling device; the microscope is a split microscope; the sampling ball is arranged under an objective lens of the integrated microscope for observation by the microscope.
The sample observation device has the beneficial effects that the surface of the sampling ball which is large enough can be observed as much as possible under the condition of not moving a microscope through the sample observation device, and the observation efficiency of a sample is improved.
Drawings
FIG. 1 is a schematic diagram of a crime scene sampling device according to the present invention;
FIG. 2 is a schematic view of the partial structure at A in FIG. 1;
FIG. 3 is a cross-sectional view of a sampling ball in the crime scene sampling device of the present invention;
FIG. 4 is a front view showing a sample ball at an initial position in the crime scene sampling device according to the present invention;
fig. 5 is a front view of the crime scene sampling device according to the present invention, in which the sampling ball is located at the end position.
In the drawings, the list of components represented by the various numbers is as follows:
1. the sampling ball, 101, a weak adhesive layer, 102, a silica gel layer, 103, a hard sphere center, 11, a first connecting rod, 12, a second connecting rod, 121 and a connector;
2. the device comprises a bracket, 21, a guide rail, 22, a rack, 211, a guide rail groove, 212, a guide rail side wall, 24, a gear, 23, a tooth part, 221, a first bearing, 222, a second bearing, 25, a first knob, 26 and a second knob;
3. a base;
o1, a first observation point, O2 and a second observation point;
l1, a first regression line, L2, a second regression line, L3 and an equator line.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1 to 3, the crime scene sampling device of the present invention comprises a sampling ball 1 and a bracket 2; the surface of the sampling ball 1 is a weak-viscosity adhesive layer 101; the sampling ball 1 is fixedly provided with a first connecting rod 11 and a second connecting rod 12, and the first connecting rod and the second connecting rod are positioned on the same axis of the sampling ball 1; the sampling ball 1 is detachably connected with the bracket 2 through a first connecting rod 11 and a second connecting rod 12; the bracket 2 is of a semicircular arc structure; the bracket 2 comprises a fixed part and a sliding part, and the sliding part is slidably arranged on the fixed part; the first connecting rod 11 is rotatably connected with one end of the sliding part of the bracket 2, the second connecting rod 12 is rotatably connected with the other end of the sliding part of the bracket 2, and the sampling ball 1 rotates by rotating the first connecting rod 11 or the second connecting rod 12; the sliding part slides along the fixing part to drive the sphere center of the sampling sphere 1 to revolve around the circle center of the semicircular arc of the bracket 2.
When the lengths of the first and second connection rods 11 and 12 are not equal, the revolution of the sampling ball 1 is the revolution in the narrow sense; when the lengths of the first and second connection bars 11 and 12 are equal, the revolution of the sampling ball 1 is a revolution in a broad sense; that is, the center of the sphere of the sampling ball 1 coincides with the center of the arc of the bracket 2, and the sliding part slides along the fixing part to drive the sampling ball 1 to rotate around the other axis, and the axis is perpendicular to the axes of the first connecting rod 11 and the second connecting rod 12.
According to the crime scene sampling device, when sampling is performed, the first connecting rod 11 or the second connecting rod 12 rotates the sampling ball 1 to enable the weakly viscous surface of the sampling ball to be adhered with cells falling off from a human body or other target evidence possibly on a crime scene, so that the evidence is extracted; after extraction, the cotton swab can be directly fixed on the bracket 2 through the first connecting rod 11 and the second connecting rod 12 for direct observation by an analysis and observation device without transferring again, so that the problem that the cotton swab adopted in the prior art cannot be directly observed is avoided, and the possibility that a certificate is polluted or defective is prevented.
The crime scene sampling device is characterized in that an observation visual angle is positioned at the upper part of a sampling ball 1, and the sampling ball 1 is provided with an equatorial line L3, a first regression line L1 and a second regression line L2; the equator line L3 is a line where the cross section of the sampling ball 1 perpendicular to the diameter of the first connecting rod 11 and the second connecting rod 12 intersects with the spherical surface; the first regression line L1 is a line intersecting the spherical surface at a circumferential surface parallel to the cross section of the sampling ball 1 where the topmost point on the sampling ball 1 can be observed from the observation angle when the observation is performed, and the second regression line L2 is a line symmetrical to the first regression line L1 with respect to the equator line L3; the sampling ball 1 can rotate or revolve, so that the degree of freedom of the sampling ball 1 is greatly improved, and under the condition of fixed observation visual angle, the region between the two return lines on the sampling ball 1 can be observed by controlling the rotation and revolution of the sampling ball 1; when the sampling ball can only rotate or only revolve, the observation range of the observation visual angle at the same position can only be limited to the circumferential spherical surface area where the visual angle is located.
In the above embodiment, it is preferable that the surface of the sampling ball 1 is one of black, dark blue and dark gray, so that the light-colored human body exfoliated cells adhered to the surface thereof are more easily observed.
As shown in fig. 1, in the above embodiment, it is preferable that the base 3 is fixedly installed at the bottom of the bracket 2; so that the sampling ball 1 can be stably placed when observed.
In the above embodiment, it is preferable that the first connecting rod 11 and the second connecting rod 12 are elastically mounted to the bracket 2; during installation, the two ends of the bracket 2 are slightly elastically deformed in the diameter direction by external force application, so that the first connecting rod 11 and the second connecting rod 12 can be installed on the bracket 2, and the sampling ball 1 and the bracket 2 are easy to install.
As shown in fig. 3, in the above embodiment, preferably, the inner portion of the sampling ball 1 includes a silica gel layer 102 and a hard ball center 103, the silica gel layer 102 is wrapped outside the hard ball center 103, and the outer portion of the silica gel layer 102 is wrapped with a weak adhesive gel layer; the structure of the silica gel layer 102 wrapping the hard sphere center 103 can reduce the weight of the sampling sphere.
In the above embodiment, the radius of the sampling ball 1 is preferably 2.5cm, wherein the thickness of the silica gel layer 102 is 1.0 cm, and the radius of the hard sphere center 103 is 1.4cm.
In the above embodiment, it is preferable that the lengths of the first and second connection bars 11 and 12 are 2.5cm, respectively.
The fixing part in the invention comprises, but is not limited to, a track, a guide rail or a chute; the sliding part comprises a sliding rail or a sliding groove; and the sliding manner between the fixed portion and the sliding portion includes, but is not limited to, mechanical sliding, sliding controlled by a cylinder.
As shown in fig. 1 to 2 and fig. 4 to 5, in one embodiment of the present invention, the fixing portion of the bracket 2 is a guide rail 21, and at least one end of the guide rail 21 is an open end; the sliding part of the bracket 2 is a rack 22; the guide rail 21 and the rack 22 are of a semicircular arc structure with the same circle center; the guide rail 21 has a guide rail groove 211 extending along an arc shape thereof and guide rail side walls 212 corresponding to both sides of the guide rail groove 211; the rack 22 is accommodated in the guide rail groove 211, and both side walls of the rack 22 slidably abut against the guide rail side walls 212; one side edge of the rack 22 slidably abuts against the bottom of the guide rail groove 211; the other side edge of the rack 22 is provided with a tooth part 23, and the teeth of the tooth part 23 face the notch of the guide rail groove 211; edges on two sides of the notch of the guide rail groove 211 extend towards the middle along the notch, and the rack 22 is limited in the guide rail groove 211; a gear 24 is arranged between the edges of the two sides of the notch of the guide rail groove 211, and the shaft of the gear 24 is rotatably arranged on the guide rail side wall 212; the gear 24 is meshed with the tooth portion 23; the gear 24 is driven to rotate by the shaft of the rotating gear 24, so that the rack 22 is driven to slide along the guide rail 21 and slide out through the open end of the guide rail 21; the rack 22 can be retained within the track groove 211; therefore, the sampling ball 1 can revolve with the sliding of the rack 22; the gear 24 is adopted to control the sliding of the rack 23, and the rack can stop at any time in the sliding process, so that the observation process of the evidence on the sampling ball 1 is more free; when both ends of the guide rail 21 are open ends, the rack 22 can be extended along both open ends, increasing the degree of freedom of sliding of the rack 22.
As shown in fig. 2, in the above embodiment, it is preferable that one end of the shaft of the gear 24 is mounted with a first knob 25, and the first knob 25 is located outside the side wall 212 of the one side rail; the first knob 25 drives the gear 24 to rotate; the rotation of the gear 24 is made easy to control.
In the above embodiment, when both ends of the guide rail 21 are open ends, the angle at which the rack 22 is easily slid is excessively large, resulting in a decrease in stability of the holder 2 and the sampling ball 1; thus, the present invention provides a more preferred embodiment. As shown in fig. 1 to 2 and 4 to 5, a more preferable embodiment is that one end of the guide rail 21 is a closed end and the other end is an open end; one end of the rack 22 is positioned in the guide rail groove 211 and slides along the guide rail groove 211 between the closed end and the open end of the guide rail 21, and the other end is positioned outside the open end of the guide rail groove 211 and moves away from or near the open end of the guide rail groove 211 along the circle in which the rack 22 is positioned; when the sampling ball 1 is positioned at the initial position, one end of the rack 22 is abutted against the closed end of the guide rail 21, the other end of the rack is positioned at the open end of the guide rail 21, the gear 24 rotates to drive the rack 22 to slide, so that one end of the rack 22 slides towards the open end of the guide rail 21, and the other end of the rack is separated from the guide rail 21; when the sampling ball 1 is at the end position, one end of the rack 22 moves to the position of the gear 24, and at the moment, the gear 24 is reversely rotated, so that the sampling ball 1 returns to the initial position; the sampling ball 1 is driven by the rack 22 to reciprocate between the initial position and the end position, so that the center of the sampling ball 1 can revolve around the center of the arc of the bracket 2.
As shown in fig. 1 to 2, in the above embodiment, it is preferable that the angle at which the rack 22 slides is 120 °; the revolution angle of the sampling ball 1 is set to be 120 degrees; the sampling ball 1 rotating in this range can maintain the overall balance of the device when having a sufficiently large rotation angle, so that the overall device has good stability when observing the sample on the surface of the sampling ball 1.
In the above embodiment, it is preferable that the central angle of the arc in which the tooth portion 23 is located is 120 °, so that the sliding angle of the rack 22 is 120 °; and, when the sampling ball 1 is at the initial position, the tooth part 23 on the rack 22 is positioned between the gear 24 and the closed end of the guide rail 21; the sampling ball 1 is rotated by an angle of 120 ° between the initial position and the end position.
In the present invention, the first connecting rod 11 and the second connecting rod 12 are rotatably connected to two ends of the rack 22, including but not limited to rotatably connected through bearings and rotatably clamped with a limit ring. As shown in fig. 1 to 2 and fig. 4 to 5, the embodiment rotatably connected by the bearing is specifically: the first bearing 221 and the second bearing 222 are fixedly installed at both ends of the rack 22, respectively; the end part of the second connecting rod 12 is provided with a connector 121; the first bearing 221 is inserted into and fixed to the end of the first connecting rod 11; the second bearing 222 is inserted and fixed by the end of the second connecting rod 12, and the connection head 121 passes through the second bearing 222; the sampling ball 1 is driven to rotate by rotating the connector 121.
In the above embodiment, preferably, the connection manner between the bearing and the end of the rack 22 includes that the end of the rack 22 is directly welded to the outer side wall of the bearing, or the end of the rack 22 is fixedly connected with a bearing mounting ring, and the bearing mounting ring is sleeved on the outer side wall of the bearing to fix the bearing.
As shown in fig. 1 to 5, in the above embodiment, it is preferable that the second knob 26 is detachably mounted on the connection head 121; by rotating the second knob 26, the connector 121 drives the second connecting rod 12 to rotate, so as to drive the sampling ball 1 to rotate.
The invention provides a evidence observation device, which comprises the sampling device and a microscope, wherein an objective lens of the microscope is positioned above a sampling ball 1;
in one embodiment of the invention, the microscope is a bulk microscope.
The working process of the evidence observation device comprises the following steps:
s1) a second connecting rod 12 on the hand-held sampling ball 1 rotates the sampling ball 1 on the surface of an object with a target sample possibly existing in a crime scene, so that the surface of the sampling ball 1 is stuck with the sample;
s2) mounting the sampling ball 1 on the bracket 2; the concrete installation mode is that the end part of the first connecting rod 11 of the sampling ball 1 is inserted into a first bearing 221 on the rack 22, the end part of the second connecting rod 12 of the sampling ball 1 is inserted into a second bearing 222 on the rack 22, and the connecting head 121 passes through the second bearing 222; mounting the second knob 26 on the connector 121;
s3) placing a microscope above the sampling ball 1, and starting to observe the sample on the surface of the sampling ball 1; during observation, the second knob 26 is turned to enable the sampling ball 1 to rotate; the first knob 25 is rotated to drive the gear 24 to rotate, so that the gear 24 drives the rack 22 to slide along the guide rail 21, and the sampling ball 1 is driven to revolve around the center of the arc of the bracket 2, and all areas between two return lines on the sampling ball 1 can be observed.
After the observation is completed, the effective sample is transferred and stored as a evidence, and the used sampling ball 1 can be discarded.
As shown in fig. 4 to 5, in one embodiment of the present invention, the microscope initially observes the first observation point O1 and its surrounding area on the sampling ball 1, and at this time, the second observation point O2 and its surrounding area on the sampling ball 1 cannot be observed by the microscope. By the steps of the above sampling and analyzing method, the first knob 25 and the second knob 26 are turned to move the second observation point O2 and its surrounding area to the visible area, at which time the microscope can observe the second observation point O2 and its surrounding area; therefore, the microscope can observe the region between the first regression line L1 and the second regression line L2 on the sampling ball 1, avoiding the problem that the microscope of uniform viewing angle can only observe the region around the equator L3 when the sampling ball 1 can only perform rotation about one axis.
In the above embodiment, preferably, after the sampling in step S1), the sampling ball 1 may be temporarily stored in a sealed bag or a sealed container, so as to ensure that the surface of the sampling ball 1 is not contaminated before the observation.
In the description of the present invention, it should be noted that the terms "center of sphere," "center of circle," "diameter," "upper," "lower," "vertical," "horizontal," "bottom," "inner," "outer," "axial," "radial," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A crime scene sampling device, which is characterized by comprising a sampling ball (1) and a bracket (2); the surface of the sampling ball (1) is a weak-viscosity adhesive layer (101);
a first connecting rod (11) and a second connecting rod (12) are fixedly arranged on the sampling ball (1), and the first connecting rod and the second connecting rod are positioned on the same axis of the sampling ball (1);
the bracket (2) is of a semicircular arc structure; the bracket (2) comprises a fixed part and a sliding part, wherein the sliding part is slidably arranged on the fixed part;
the first connecting rod (11) is rotatably connected with one end of the sliding part of the bracket (2), the second connecting rod (12) is rotatably connected with the other end of the sliding part of the bracket (2), and the first connecting rod (11) or the second connecting rod (12) rotates to drive the sampling ball (1) to rotate; the sliding part slides along the fixing part to drive the sampling ball (1) to revolve around the center of the semicircular arc of the bracket (2).
2. The crime scene sampling device according to claim 1, wherein a base (3) is fixedly installed on a fixing portion of the bracket (2).
3. The crime scene sampling device according to claim 1, wherein the first connecting rod (11) and the second connecting rod (12) are mounted with the bracket (2) in an elastic manner.
4. A crime scene sampling device according to any one of claims 1 to 3, wherein the fixed part of the bracket (2) is a guide rail (21), and at least one end of the guide rail (21) is an open end; the sliding part of the bracket (2) is a rack (22); the guide rail (21) and the rack (22) are of semicircular arc structures, and the centers of the two are coincident;
the guide rail (21) is provided with a guide rail groove (211) extending along the arc shape of the guide rail and guide rail side walls (212) corresponding to the two sides of the guide rail groove (211); the rack (22) is accommodated in the guide rail groove (211), and two side walls of the rack (22) are slidably abutted with the guide rail side walls (212); one side edge of the rack (22) is slidably abutted with the bottom of the guide rail groove (211);
a tooth part (23) is arranged at the edge of the other side of the rack (22), and the tooth part (23) faces to the notch of the guide rail groove (211);
edges on two sides of a notch of the guide rail groove (211) extend towards the middle along the notch, and the rack (22) is limited in the guide rail groove (211);
a gear (24) is arranged between the edges of the two sides of the notch of the guide rail groove (211), and the shaft of the gear (24) is rotatably arranged on the side wall (212) of the guide rail; the gear (24) is meshed with the tooth part (23);
the shaft for rotating the gear (24) drives the gear (24) to rotate, so that the rack (22) is driven to slide along the guide rail (21) and extend out along the open end of the guide rail (21).
5. The crime scene sampling device according to claim 4, wherein one end of the shaft of the gear (24) passes through the guide rail side wall (212) and is mounted with a first knob (25), the first knob (25) being located outside one side of the guide rail side wall (212); the first knob (25) drives the gear (24) to rotate.
6. A crime scene sampling device according to claim 4, wherein,
one end of the guide rail (21) is a closed end, and the other end is an open end; one end of the rack (22) is positioned in the guide rail groove (211) and slides along the guide rail groove (211) between the closed end and the open end of the guide rail (21); the other end is positioned outside the open end of the guide rail groove (211) and moves away from or near the open end of the guide rail groove (211) along the circle where the rack (22) is positioned.
7. A crime scene sampling device according to claim 6, wherein the rack (22) slides at an angle of 120 °.
8. The crime scene sampling device according to claim 6, wherein both ends of the rack (22) are fixedly provided with a first bearing (221) and a second bearing (222), respectively; a connector (121) is arranged at the end part of the second connecting rod (12);
the first bearing (221) is used for inserting and fixing the end part of the first connecting rod (11); the second bearing (222) is inserted and fixed by the end of the second connecting rod (12), and the connecting head (121) passes through the second bearing (222); the end part of the connector (121) is rotated to drive the sampling ball (1) to rotate.
9. A crime scene sampling device according to claim 8, wherein the connector (121) is detachably mounted with a second knob (26).
10. A certification viewing device comprising a sampling device and a microscope, wherein the sampling device is a crime scene sampling device according to any one of claims 1 to 9; the microscope is a split microscope;
the sampling ball (1) is arranged under an objective lens of the integrated microscope for observation by the microscope.
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| CN202010896220.2A CN112033720B (en) | 2020-08-31 | 2020-08-31 | Crime scene sampling device and evidence viewing device |
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| CN202010896220.2A CN112033720B (en) | 2020-08-31 | 2020-08-31 | Crime scene sampling device and evidence viewing device |
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| CN112033720B true CN112033720B (en) | 2023-05-16 |
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