A crime scene evidence device and method of use thereof

Abstract

The application relates to the field of evidence taking equipment, in particular to a crime scene evidence taking equipment and a using method thereof. The equipment comprises a card frame, an air channel is formed in the card frame, a blocking plate is movably embedded and installed on one side surface of the card frame, a material cylinder is movably arranged above the card frame, a plurality of sub-material cylinders are movably arranged in the material cylinder, a supporting frame is fixedly installed on the inner surface of the material cylinder, a material collecting box is fixedly installed on the lower surface of the supporting frame, and a supporting plate is movably arranged in the material collecting box. In the application, when the footprint on the slope is imprinted, the plaster solution can be prevented from flowing downward under the action of gravity, the overall thickness of the solidified plaster board is the same, the weak part of the plaster board is prevented from being damaged and broken, when the footprint in the low-lying ground with accumulated rainwater is imprinted, the footprint can be separated from the low-lying ground, only the rainwater at the footprint is cleaned, the workload of cleaning the rainwater is reduced, and the plaster solution can be quickly solidified after being laid.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forensic equipment, in particular to a criminal scene evidence collection device and a method thereof. BACKGROUND

[0002] The crime scene is the place where the criminal commits the crime and leaves traces and evidence related to the crime. The crime scene is objectively existing. Any criminal behavior must be conducted within a certain spatial range, which will cause changes in certain things, such as the injury and loss of the infringed object, the change of the object's position relationship, structure state and surface form, and the increase or decrease of the object. In general, the evidence collected from the crime scene can be used to preliminarily determine the course of the event and handle potential fingerprints, shoe prints, mobile phone-related clothes, bullet heads and special items.

[0003] The existing criminal scene footprint evidence collection is to first place a square frame outside the footprint, and then pour the prepared plaster solution into the square frame to make a print of the footprint. However, when making a print of the footprint on a slope, the plaster solution flows downward under the action of gravity, which causes the thickness and strength of the hardened plaster board to be inconsistent, and the weak part is easily damaged. In addition, when making a print of the footprint inside a low-lying ground with accumulated rainwater, it is necessary to first remove all the rainwater inside the low-lying ground before making a print, and it is not convenient to separate the footprint from the low-lying ground and clean only the rainwater at the footprint after the plaster solution is laid. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present application is to provide a criminal scene evidence collection device and a method thereof. By inserting the blocking plate into the slot, the blocking plate is engaged with the sliding groove, and then the insertion plate is inserted into the soft ground. The hand holding the handle is pulled upward to pull the rod, so that the cutting knife cuts the packaging bag containing the plaster solution through the grid, and the plaster solution flows into the square frame to make a print of the footprint. Thus, when making a print of the footprint on a slope, the plaster solution is prevented from flowing downward under the action of gravity, so that the overall thickness of the hardened plaster board is the same, and the weak part is prevented from being damaged. By inserting the insertion plate into the low-lying ground, the square frame and the insertion plate separate the footprint from the low-lying ground into two spaces. The pull ring is pulled to slide the cartridge to move to one end of the square frame, so that the space above the square frame leaks and the rainwater inside the square frame is removed. Thus, when making a print of the footprint inside a low-lying ground with accumulated rainwater, the footprint can be separated from the low-lying ground, and only the rainwater at the footprint is cleaned, thereby reducing the workload of cleaning rainwater.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] The utility model provides a kind of criminal scene evidence collection equipment, including card frame, air passage is opened inside the card frame, the side surface of the card frame is movably embedded with baffle plate, the upper surface of the card frame is movably equipped with cartridge, the inside of the cartridge is movably equipped with multiple sub-charging barrels, the inside surface of the cartridge is fixedly installed with support frame, the lower surface of the support frame is fixedly installed with collection box, the inside of the collection box is movably equipped with support plate, the upper surface of the support plate is fixedly installed with cutter on both sides, the surface of the card frame is fixedly installed with slide rail on both sides, the inside of the slide rail is slidably connected with sliding block, the front surface of the card frame is fixedly embedded with air inlet cylinder, the inside of the air inlet cylinder is movably equipped with air inlet fan, the side of the air inlet fan is fixedly installed with motor, the inside surface of the air inlet cylinder is fixedly embedded with heating wire.

[0007] Further in: the lower surface of the card frame is fixedly installed with plug-in board, the rear surface of the card frame is provided with exhaust groove, the air inlet cylinder and exhaust groove are communicated with the air passage, the inside surface of the card frame is provided with sliding groove on both sides, the rear surface of the card frame is provided with insertion slot, the baffle plate is slidably connected with sliding groove through insertion slot, by the friction of baffle plate and sliding groove, baffle plate is fixed, air enters from air inlet cylinder, and is discharged from exhaust groove, to form circulation in the air passage, so as to conduct heat.

[0008] Further in: the outside surface of the cartridge is fixedly installed with handle symmetrically, the outside surface of the cartridge is fixedly installed with fixed sleeve, the inside of the fixed sleeve is movably inserted with pull rod, the outside surface of the cartridge and the collection box is provided with square slot, the lower end of the pull rod is fixedly connected with the one end of the support plate through square slot, by two handles, the evidence collection equipment can satisfy single hand and or double hand use.

[0009] Further in: the upper surface of the support plate is fixedly connected with one spring at one end, the upper end of the one spring is fixedly connected with the fixed sleeve, the inside of the collection box is fixedly installed with baffle on one side surface, the lower end surface of the collection box is fixedly installed with discharge pipe, the one end of the discharge pipe is fixedly connected with the cartridge, under the elastic force of one spring, pull rod drives cutter reset, the one end of discharge pipe discharge is lower than the one end of feeding, so that the card frame can be placed obliquely, and gypsum can also be discharged from discharge pipe.

[0010] Further in: the inside surface of the sub-charging barrel is fixedly installed with grid at lower end, the one side surface of the sub-charging barrel is provided with limiting slot at upper end, the upper end surface of the cartridge is fixedly installed with elastic metal tab, the elastic metal tab is movably connected with sub-charging barrel through limiting slot, rotate sub-charging barrel, make elastic metal tab separate from this sub-charging barrel, and be engaged with the limiting slot of another sub-charging barrel, supplement new gypsum solution, so that the equipment is more convenient to use.

[0011] Further in: the slider is fixedly connected with the barrel, a supporting ring is fixedly installed on one side surface of the slider, an insertion rod is movably inserted into the supporting ring, a pull ring is fixedly installed on the upper end surface of the insertion rod, a plurality of limiting holes are formed in the upper surface of the slide rail, the lower end of the insertion rod penetrates through the supporting ring and is movably connected with the limiting hole, a No. 2 spring is movably arranged outside the insertion rod, the upper end of the No. 2 spring is fixedly connected with the insertion rod, and the lower end of the No. 2 spring is fixedly connected with the supporting ring. Pulling the pull ring makes the insertion rod separate from the limiting hole, the barrel is slid, and the barrel is moved to one end of the clamping frame, so that the insertion rod is clamped with the limiting hole at the corresponding position. The space above the clamping frame is leaked, and the rainwater in the clamping frame is removed.

[0012] Further in: a filter screen is movably embedded and installed on the outer surface of the air inlet cylinder, a clamping groove is formed in the outer surface of the air inlet cylinder, the filter screen is movably connected with the air inlet cylinder through the clamping groove, the output end of the motor is fixedly connected with the air inlet fan, a fixing rod is fixedly installed on the outer surface of the motor, one end of the fixing rod is fixedly connected with the air inlet cylinder, and the motor and the heating wire are controlled to operate. The motor introduces the external air into the air inlet cylinder, the heat generated by the heating wire is blown into the air passage, and the clamping frame is heated.

[0013] A use method of a crime scene evidence collection device, and specific use steps of the crime scene evidence collection device are as follows:

[0014] Step one: the inner surface of the clamping frame and the lower surface of the blocking plate are smeared with a release agent, when the soft ground is used on the slope, the stirred gypsum solution is packaged in a bag and placed in the distribution barrel,

[0015] Step two: hold the handle, lift the whole device, insert the blocking plate into the insertion slot, make the blocking plate clamped with the sliding groove, insert the insertion plate into the soft ground, pull the pull rod upward, make the supporting plate move upward in the square groove, make the cutter pass through the grid, make the cutter cut the packaging bag of the packaged gypsum solution, the gypsum solution flows into the collecting box, then flows into the clamping frame through the blocking plate and the clamping frame, and the footprint is imprinted, after the gypsum flows out, the pull rod is loosened, and the pull rod drives the cutter to reset under the elastic force of the No. 1 spring;

[0016] Step three: control the motor and the heating wire to operate, make the motor introduce the external air into the air inlet cylinder, blow the heat generated by the heating wire into the air passage, heat the clamping frame, so that the gypsum is heated, and the gypsum solidification is accelerated. After the gypsum solidifies, pull the handle, and pull out the insertion plate from the ground;

[0017] Step four: when continuously used, rotate the distribution barrel, make the elastic metal tab separate from the distribution barrel, and clamped with the limiting groove of another distribution barrel, and new gypsum solution is supplemented;

[0018] Step five: when used in low-lying ground with rainwater accumulation, repeat step one, insert the plug plate into the low-lying ground, so that the card frame and the plug plate separate the footprints from the low-lying ground into two spaces, pull the pull ring to separate the plug rod from the limiting hole, slide the barrel to move it to one end of the card frame, make the plug rod engage with the limiting hole at the corresponding position, let the space above the card frame leak out, clean the rainwater in the card frame, then repeat step three to complete the footprint transfer printing.

[0019] The beneficial effects of the present application are:

[0020] 1. By inserting the blocking plate into the slot, the blocking plate is engaged with the sliding groove, then the plug plate is inserted into the soft ground, the pull rod is pulled upwards by holding the handle, the support plate is moved upwards in the square slot, the cutter is inserted through the grid, the cutter cuts the packaging bag containing the gypsum solution, the gypsum solution flows into the collecting box, then flows into the card frame through the discharge pipe between the blocking plate and the card frame, the footprint is transferred, after the gypsum flows out, the pull rod is released, under the elastic force of the first spring, the pull rod drives the cutter to reset, through the two handles, the evidence taking device can be used with one hand or both hands, after the gypsum solidifies, the plug plate is pulled out of the ground, the transfer printing is completed, so that when the footprint on the slope is transferred, the gypsum solution does not flow downward under the action of gravity, the overall thickness of the solidified gypsum board is the same, and the weak part is not damaged and broken.

[0021] 2. By inserting the plug plate into the low-lying ground, the card frame and the plug plate separate the footprints from the low-lying ground into two spaces, the pull ring is pulled to separate the plug rod from the limiting hole, the barrel is slid to move it to one end of the card frame, the plug rod is engaged with the limiting hole at the corresponding position, the space above the card frame leaks out, the rainwater in the card frame is cleaned, then the footprint transfer printing is performed, so that when the footprint in the low-lying ground with rainwater accumulation is transferred, the footprint is separated from the low-lying ground, only the rainwater at the footprint is cleaned, and the workload of cleaning the rainwater is reduced.

[0022] 3. By controlling the operation of the motor and the heating wire, the motor introduces the external air into the air inlet cylinder, the heating wire blows the heat to the air duct, the card frame is heated, so that the gypsum is heated, the gypsum solidification is accelerated, and the gypsum can be quickly demolded. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below with reference to the accompanying drawings.

[0024] Figure 1 is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 is a schematic diagram of the overall structure of the present application;

[0026] Figure 3It is the schematic diagram of the barrel section structure in the application;

[0027] Figure 4 It is the schematic diagram of the barrel and card frame section structure in the application;

[0028] Figure 5 It is the schematic diagram of the card frame section structure in the application;

[0029] Figure 6 It is the schematic diagram of the air inlet cylinder vertical section structure in the application;

[0030] Figure 7 It is the schematic diagram of the air inlet cylinder vertical section structure in the application; Figure 4 of the application.

[0031] In the figure: 1, card frame; 101, plugboard; 102, airway; 103, sliding chute; 104, exhaust slot; 105, plug slot; 106, blocking plate; 2, barrel; 201, handle; 202, support frame; 203, material collecting box; 204, discharge pipe; 205, square groove; 206, fixing sleeve; 3, support plate; 301, cutter; 302, No. 1 spring; 303, pull rod; 304, baffle; 4, material distributing barrel; 401, limiting slot; 402, elastic metal tab; 403, grid; 5, sliding rail; 501, sliding block; 502, support ring; 503, plug rod; 504, No. 2 spring; 505, pull ring; 506, limiting hole; 6, air inlet cylinder; 601, filter screen; 602, heating wire; 603, air inlet fan; 604, motor; 605, clamping groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0033] Please refer to Figures 1-7As shown, a crime scene evidence device, including card frame 1, card frame 1 inside opening airway 102, card frame 1 side surface activity embedded installation has the stop plate 106, card frame 1 top activity is equipped with barrel 2, barrel 2 inside activity is equipped with multiple sub-charging barrel 4, barrel 2 inside surface fixedly installed with support frame 202, support frame 202 lower surface fixedly installed with material collecting box 203, material collecting box 203 inside activity is equipped with support plate 3, support plate 3 upper surface both sides are fixedly installed with cutter 301, card frame 1 both sides surface are fixedly installed with slide rail 5, slide rail 5 inside sliding connection has sliding block 501, card frame 1 front surface fixedly embedded installation has air inlet cylinder 6, air inlet cylinder 6 inside activity is equipped with air inlet fan 603, air inlet fan 603 one side fixedly installed with motor 604, air inlet cylinder 6 inside surface fixedly embedded installation has heating wire 602.

[0034] Card frame 1 lower surface fixedly installed with plug-in board 101, card frame 1 rear surface opening air exhaust groove 104, air inlet cylinder 6 and air exhaust groove 104 are communicated with airway 102, card frame 1 inside both sides surface opening sliding groove 103, card frame 1 rear surface opening insertion slot 105, stop plate 106 penetrates insertion slot 105 and sliding groove 103 sliding connection, through the friction between stop plate 106 and sliding groove 103, static stop plate 106 is fixed, air enters from air inlet cylinder 6, and is discharged from air exhaust groove 104, and forms circulation in airway 102 to facilitate heat conduction;The outside surface of barrel 2 is fixedly installed with handle 201 symmetrically, the outside surface of barrel 2 is fixedly installed with fixed sleeve 206, the inside of fixed sleeve 206 is inserted with pull rod 303, the outside surface of barrel 2 and material collecting box 203 is equipped with square groove 205, one end of support plate 3 penetrates square groove 205 and is fixedly connected with lower end of pull rod 303, through two handles 201, the evidence device can satisfy single hand and or double hand use;One end of the upper surface of support plate 3 is fixedly connected with a spring 302, the upper end of spring 302 is fixedly connected with fixed sleeve 206, the inside of material collecting box 203 is fixedly installed with baffle 304, the lower end surface of material collecting box 203 is fixedly installed with discharge pipe 204, one end of discharge pipe 204 is fixedly connected with barrel 2, under the action of the elastic force of spring 302, pull rod 303 drives cutter 301 to reset, one end of discharge pipe 204 is lower than the other end of feeding, so that card frame 1 is placed obliquely, gypsum can also be discharged from discharge pipe 204, so that when the footprint on the slope is expanded, the gypsum solution is prevented from flowing downward under the action of gravity, the overall thickness of the solidified gypsum board is the same, and the weak part is prevented from being damaged and broken;

[0035] The grid net 403 is fixedly installed at the lower end of the inner surface of the distributing cylinder 4, the limiting groove 401 is arranged at the upper end of the surface of one side of the distributing cylinder 4, the elastic metal tab 402 is fixedly installed on the upper end surface of the cylinder 2, the elastic metal tab 402 is movably connected with the distributing cylinder 4 through the limiting groove 401, the distributing cylinder 4 is rotated, the elastic metal tab 402 is separated from the distributing cylinder 4, is clamped with the limiting groove 401 of another distributing cylinder 4, new gypsum solution is supplemented, and the equipment is more convenient to use; the sliding block 501 is fixedly connected with the cylinder 2, the supporting ring 502 is fixedly installed on the surface of one side of the sliding block 501, the plug rod 503 is movably inserted into the supporting ring 502, the pull ring 505 is fixedly installed on the upper end surface of the plug rod 503, a plurality of limiting holes 506 are arranged on the upper surface of the sliding rail 5, the lower end of the plug rod 503 penetrates through the supporting ring 502 and is movably connected with the limiting hole 506, the second spring 504 is movably sleeved on the outer side of the plug rod 503, the upper end of the second spring 504 is fixedly connected with the plug rod 503, the lower end of the second spring 504 is fixedly connected with the supporting ring 502, the pull ring 505 is pulled, the plug rod 503 is separated from the limiting hole 506, the cylinder 2 is slid, the cylinder 2 is moved to one end of the clamping frame 1, the plug rod 503 is clamped with the limiting hole 506 at the corresponding position, the space above the clamping frame 1 is leaked, and the rainwater in the clamping frame 1 is removed, so that when the footprint in the low-lying ground where rainwater accumulates is imprinted, the footprint can be separated from the low-lying ground, only the rainwater at the footprint is cleaned, and the workload of cleaning the rainwater is reduced.

[0036] The filter screen 601 is movably embedded and installed on the outer surface of the air inlet cylinder 6, the air inlet cylinder 6 is provided with a clamping groove 605 on the outer surface, the filter screen 601 is movably connected with the air inlet cylinder 6 through the clamping groove 605, the output end of the motor 604 is fixedly connected with the air inlet fan 603, the fixed rod is fixedly installed on the outer surface of the motor 604, one end of the fixed rod is fixedly connected with the air inlet cylinder 6, the operation of the motor 604 and the heating wire 602 is controlled, the motor 604 introduces external air into the air inlet cylinder 6, the heat generated by the heating wire 602 is blown into the air duct 102, the clamping frame 1 is heated, so that the gypsum is heated, the solidification of the gypsum is accelerated, and the gypsum can be quickly demolded.

[0037] A use method of a crime scene evidence collection device, and specific use steps of the crime scene evidence collection device are as follows:

[0038] Step one: the inside surface of the clamping frame 1 and the lower surface of the blocking plate 106 are smeared with a demolding agent, when the soft ground on the slope is used, the gypsum solution that is stirred in advance is packaged with a bag, and is placed into the distributing cylinder 4,

[0039] Step two: hold the handle 201, lift the device as a whole, insert the plug plate 106 into the slot 105, make the plug plate 106 and the chute 103 card, and then insert the plug plate 101 into the soft ground, hold the handle 201, pull the pull rod 303 upwards, make the support plate 3 move upwards in the square groove 205, make the cutter 301 pass through the grid 403, make the cutter 301 cut the packaging bag of gypsum solution, make the gypsum solution flow into the collecting box 203, and then flow into the card frame 1 through the discharge pipe 204, make the card frame 1 print the footprint, and then release the pull rod 303, under the elastic force of the first spring 302, make the pull rod 303 drive the cutter 301 to reset;

[0040] Step three: control the motor 604 and the heating wire 602 to operate, make the motor 604 introduce the external air into the air inlet cylinder 6, make the heating wire 602 blow the heat to the air duct 102, make the card frame 1 heat, so that the gypsum is heated, and the gypsum is solidified, pull the handle 201, and then pull out the plug plate 101 from the ground;

[0041] Step four: when continuously used, rotate the distribution cylinder 4, make the elastic metal tab 402 separate from the distribution cylinder 4, make the elastic metal tab 402 and the limiting groove 401 of another distribution cylinder 4 card, and then supplement the new gypsum solution;

[0042] Step five: when used in the low-lying ground with accumulated rainwater, repeat step one, insert the plug plate 101 into the low-lying ground, make the card frame 1 and the plug plate 101 separate the footprint and the low-lying ground into two spaces, pull the pull ring 505, make the plug rod 503 separate from the limiting hole 506, slide the cylinder 2, move the cylinder 2 to one end of the card frame 1, make the plug rod 503 and the limiting hole 506 in the corresponding position card, make the space above the card frame 1 leak, remove the rainwater in the card frame 1, then repeat step three, and complete the footprint printing.

[0043] Working principle: During use, apply a release agent to the inner surface of the card frame 1 and the lower surface of the blocking plate 106. When using on soft, sloping ground, seal the pre-mixed plaster solution in a bag and place it inside the dispensing cylinder 4. When using plaster continuously, rotate the dispensing cylinder 4 to separate the elastic metal paddle 402 from the dispensing cylinder 4 and engage it with the limiting groove 401 of another dispensing cylinder 4. Replenish with new plaster solution to make the equipment easier to use. Hold the handle 201 and lift the entire equipment to insert the blocking plate 106 into the slot 105, making the blocking plate 106 engage with the sliding groove 103. Then insert the insert plate 101 into... On a soft surface, the hand holding handle 201 pulls the lever 303 upwards, causing the support plate 3 to move upwards inside the square groove 205. This moves the cutter 301 through the grid 403, cutting the packaging bag containing the plaster solution. The plaster solution flows into the collection box 203, then along the discharge pipe 204 from between the block plate 106 and the frame 1 into the frame 1, imprinting the footprint. After the plaster flows out, the lever 303 is released. Under the elastic force of the first spring 302, the lever 303 drives the cutter 301 to reset. The two handles 201 allow the evidence collection device to be used with one or two hands. The system operates by controlling the motor 604 and heating wire 602. The motor 604 draws outside air into the air intake 6, blowing heat from the heating wire 602 into the air passage 102, heating the frame 1 and thus the plaster, accelerating its solidification and allowing for rapid demolding. After solidification, pulling the handle 201 removes the insert plate 101 from the ground, completing the tracing process. This prevents the plaster solution from flowing downwards under gravity when tracing footprints on slopes, ensuring a uniform thickness of the cured plasterboard and preventing damage to weak points. This is particularly beneficial when used on low-lying areas prone to rainwater accumulation. Insert the insert plate 101 into the low-lying ground, so that the card frame 1 and the insert plate 101 separate the footprint from the low-lying ground into two spaces. Pull the pull ring 505 to separate the insert rod 503 from the limiting hole 506. Slide the material cylinder 2 to move it to one end of the card frame 1, so that the insert rod 503 engages with the limiting hole 506 at the corresponding position, and the space above the card frame 1 is exposed to clear the rainwater inside the card frame 1 before imprinting the footprint. In this way, when imprinting footprints in the low-lying ground where rainwater has accumulated, the footprint can be separated from the low-lying ground, and only the rainwater at the footprint area needs to be cleaned, reducing the amount of work required to clean the rainwater.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above merely illustrates and explains the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, as long as they do not deviate from the application or exceed the scope defined by the present claims.

Claims

1. A crime scene evidence device, characterized by, Including card frame (1), the air passage (102) is set up inside the card frame (1), the baffle (106) is installed in one side surface of card frame (1) activity, the material cylinder (2) is equipped on the card frame (1) activity, a plurality of material cylinder (4) is equipped in the material cylinder (2) inside activity, the support frame (202) is fixedly installed on the material cylinder (2) inside surface, the material collecting box (203) is fixedly installed on the support frame (202) lower surface, the support plate (3) is equipped in the material collecting box (203) inside activity, the cutter (301) is fixedly installed on the support plate (3) upper surface both sides, the slide rail (5) is fixedly installed on the both sides surface of card frame (1), the slide rail (5) inside slide connection has the sliding block (501), the air inlet cylinder (6) is fixedly installed on the front surface of card frame (1), the air inlet fan (603) is equipped in the air inlet cylinder (6) inside activity, the motor (604) is fixedly installed on the air inlet fan (603) one side, the heating wire (602) is fixedly installed on the air inlet cylinder (6) inside surface, the plugboard (101) is fixedly installed on the card frame (1) lower surface, the exhaust groove (104) is set up on the rear surface of card frame (1), the air inlet cylinder (6) and exhaust groove (104) all with air passage (102) communication, the sliding slot (103) is set up on the both sides surface in the card frame (1) inside, the insertion slot (105) is set up on the rear surface of card frame (1), the baffle (106) is slidably connected with sliding slot (103) through insertion slot (105), the handle (201) is fixedly installed on the material cylinder (2) outside surface symmetry, the fixed sleeve (206) is fixedly installed on the material cylinder (2) outside surface, the pull rod (303) is inserted in the fixed sleeve (206) inside activity, the material cylinder (2) and the material collecting box (203) outside surface all set up square groove (205), the support plate (3) one end is fixedly connected with pull rod (303) lower end through square groove (205), the support plate (3) upper surface one end is fixedly connected with the first spring (302), the first spring (302) upper end is fixedly connected with the fixed sleeve (206), the baffle (304) is fixedly installed on the material collecting box (203) inside one side surface, the discharge pipe (204) is fixedly installed on the material collecting box (203) lower end surface, the discharge pipe (204) one end is fixedly connected with the material cylinder (2), the grid (403) is fixedly installed on the inside surface lower end of material cylinder (4), the limiting slot (401) is set up on the one side surface upper end of material cylinder (4), the elastic metal tab (402) is fixedly installed on the material cylinder (2) upper end surface, the elastic metal tab (402) is movably connected with material cylinder (4) through limiting slot (401), the sliding block (501) is fixedly connected with the material cylinder (2), the support ring (502) is fixedly installed on the sliding block (501) one side surface, the plug rod (503) is inserted in the support ring (502) inside activity, the pull ring (505) is fixedly installed on the plug rod (503) upper end surface,The upper surface of the slide rail (5) is provided with a plurality of limiting holes (506), the lower end of the insertion rod (503) penetrates the supporting ring (502) and is movably connected with the limiting hole (506), the outer side of the insertion rod (503) movably sheaths the No. 2 spring (504), the upper end of the No. 2 spring (504) is fixedly connected with the insertion rod (503), the lower end of the No. 2 spring (504) is fixedly connected with the supporting ring (502), the outer side surface of the air inlet cylinder (6) movably embeds a filter screen (601), the outer side surface of the air inlet cylinder (6) is provided with a clamping groove (605), the filter screen (601) is movably connected with the air inlet cylinder (6) through the clamping groove (605), the output end of the motor (604) is fixedly connected with the air inlet fan (603), the outer side surface of the motor (604) is fixedly provided with a fixed rod, one end of the fixed rod is fixedly connected with the air inlet cylinder (6).

2. A method of using a crime scene evidence device as claimed in claim 1, wherein, The specific use steps of the crime scene evidence device are: Step one: the inner surface of the card frame (1) and the lower surface of the blocking plate (106) are smeared with release agent, when using on soft inclined ground, the gypsum solution mixed in advance is packaged in a bag and placed in the distribution cylinder (4), Step two: hold the handle (201), lift the whole device, insert the blocking plate (106) into the slot (105), make the blocking plate (106) engage with the sliding groove (103), then insert the plug plate (101) into the soft ground, hold the handle (201) and pull the pull rod (303) upwards, make the supporting plate (3) move upwards in the square groove (205), the cutter (301) passes through the grid (403), the cutter (301) cuts the packaging bag of gypsum solution, the gypsum solution flows into the collection box (203), then flows into the card frame (1) through the blocking plate (106) and the card frame (1), and the gypsum flows out, then loosen the pull rod (303), under the elastic force of the first spring (302), the pull rod (303) drives the cutter (301) to reset; Step three: control the motor (604) and the heating wire (602) to operate, the motor (604) introduces the external air into the air inlet cylinder (6), the heating wire (602) blows the heat to the air duct (102), the card frame (1) is heated, so that the gypsum is heated and the gypsum solidification is accelerated, after the gypsum solidification, pull the handle (201) to pull out the plug plate (101) from the ground; Step four: when continuously used, rotate the distribution cylinder (4), make the elastic metal tab (402) separate from the distribution cylinder (4) and engage with the limiting groove (401) of another distribution cylinder (4), and supplement new gypsum solution; Step five: when used on low-lying ground with accumulated rainwater, repeat step one, insert the plug plate (101) into the low-lying ground, make the card frame (1) and the plug plate (101) separate the footprint from the low-lying ground into two spaces, pull the pull ring (505), make the plug rod (503) separate from the limiting hole (506), slide the distribution cylinder (2), move it to one end of the card frame (1), make the plug rod (503) engage with the limiting hole (506) at the corresponding position, make the space above the card frame (1) leak, remove the rainwater in the card frame (1), then repeat step three to complete the footprint expansion.

Images