Criminal investigation measuring device based on criminal science and use method

Abstract

The invention relates to the field of criminal investigation measuring devices, in particular to a criminal investigation measuring device based on criminal science and a using method.The criminal investigation measuring device comprises a measuring support, a detection box is fixedly connected to the end of the measuring support, and a measuring mechanism is movably connected to the interior of the detection box; the middle part of the measuring bracket is movably connected with an adjusting and recording mechanism matched with the measuring mechanism, and the measuring mechanism comprises a movable groove. The criminal investigation measuring device based on criminal science is composed of a measuring mechanism and an adjusting and recording mechanism. Through cooperative use of the measuring support, the detection box, the measuring mechanism and other components, after the measuring support is held by hand to drive the measuring box to move to the footprint position, the worm is rotated to enable the measuring mechanism to operate, and in the process, the two measuring toothed plates move oppositely to measure the length of the footprint. Meanwhile, the main measuring rod and the auxiliary measuring rod run in an opening trend to measure the width of the footprint, synchronous measurement of the length and the width of the footprint is achieved, and operation is convenient.

Description

Technical Field

[0001] The present invention relates to the field of criminal investigation measurement devices, in particular to a criminal investigation measurement device based on criminal science and a use method thereof. Background Art

[0002] Currently, when investigating footprints left by suspects at crime scenes, the most traditional method is still to use a tape measure or ruler to measure the length and width based on the shape and calculate the size of the suspect's footprint in order to solve the case.

[0003] The existing patent (publication number: CN211147513U) discloses a footprint measurement caliper for criminal investigation scenes, including two left and right vertical rods, and two connecting rods are arranged between the two vertical rods. In the process of implementing the solution, the inventor found that the following problems in the prior art have not been well solved: 1. Usually the size of shoe sizes is standard, so the ratio of length to width of shoes of different sizes is fixed, and the existing criminal investigation measurement device needs to measure the length and width of the suspect's footprint shoe size separately during use. When there are many footprints at the crime scene, the above method is cumbersome to operate; 2. Since there may be multiple suspects' footprints at the crime scene, the existing criminal investigation measurement device is difficult to record the sizes of different footprints, and the convenience of use is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a criminal investigation measurement device based on criminal science to solve the problems raised in the above background technology: 1. It is difficult to synchronously measure the length and width of footprints during the use of some existing criminal investigation measurement devices; 2. It is difficult to record the dimensions of multiple footprints during the use of some existing criminal investigation measurement devices. To achieve the above purpose, the present invention provides the following technical solutions: A criminal investigation measurement device based on criminal science, including a measurement bracket, the end of which is fixedly connected to a detection box, and the interior of the detection box is movably connected to a measurement mechanism; The middle part of the measuring bracket is movably connected with an adjusting and recording mechanism that matches the measuring mechanism; The measuring mechanism comprises a movable groove, which is provided inside the detection box, a gear rod is rotatably connected inside the movable groove, measuring tooth plates are meshed on both sides of the gear rod, the side walls of the measuring tooth plates are slidably connected to the inner wall of the movable groove, the two measuring tooth plates are arranged in opposite directions, and an adjusting pressure rod matched with the adjusting and recording mechanism is fixedly connected to the end of the measuring tooth plate on the left side; The bottom of the detection box is fixedly connected with a movable sleeve, the bottom of the gear rod penetrates the detection box and is rotatably connected to the inner bottom surface of the movable sleeve, the inner bottom surface of the movable sleeve is rotatably connected with a movable ring, the movable ring is coaxially arranged with the gear rod, the top of the movable ring is fixedly connected with a bevel gear ring, the lower part of the gear rod is fixedly sleeved with a bevel gear matched with the bevel gear ring, the inner wall of the movable sleeve is rotatably connected with a bevel gear rod, and the bevel gear rod is arranged between the bevel gear ring and the bevel gear; The side wall of the movable ring is fixedly connected with a main measuring rod, the side wall of the movable ring is provided with a through slot, the interior of the through slot is slidably connected with a slave measuring rod, and the slave measuring rod is fixedly connected to the surface of the gear rod; The top of the detection box is fixedly connected with a transmission sleeve, the top of the gear rod passes through the detection box and is rotatably connected to the inner top surface of the transmission sleeve, the upper part of the gear rod is fixedly sleeved with a worm wheel, the inside of the transmission sleeve is slidably connected with a U-shaped bracket, a worm is rotatably connected between the two ends of the U-shaped bracket, the side wall of the worm is meshed with the side wall of the worm wheel, the side wall of the transmission sleeve is rotatably connected with a locking screw, one end of the locking screw passes through the transmission sleeve and is rotatably connected to the middle part of the U-shaped bracket.

[0005] Preferably, a scale line is provided on the top of the measuring tooth plate; The inner wall of the movable groove is symmetrically provided with sliding grooves, the side wall of the measuring tooth plate is fixedly connected with a sliding block, the sliding block is slidably connected inside the corresponding sliding groove, and a reset spring is fixedly connected between the inner wall of the sliding groove and the side wall of the sliding block.

[0006] Preferably, an arc-shaped groove is provided on the side wall of the lower portion of the movable sleeve, and the main measuring rod and the slave measuring rod are movably inserted into the arc-shaped groove.

[0007] Preferably, the adjustment and recording mechanism comprises an adjustment disk, the adjustment disk is rotatably connected to the inside of the measuring bracket, four strip grooves are equidistantly provided inside the adjustment disk along the circumference, an adjustment pressure block cooperating with the measuring mechanism is slidably connected inside the strip groove, a compression spring is fixedly connected between the side wall of the adjustment pressure block and the inner wall of the strip groove, and an oblique clamping tooth is fixedly connected to the top of the adjustment pressure block; The top of the strip groove is slidably connected with a clamping tooth plate matched with the oblique clamping teeth, a compression spring is fixedly connected between the top of the clamping tooth plate and the inner top surface of the strip groove, and an adjustment pin is fixedly connected to the middle position of the top of the clamping tooth plate; A rotating bracket is fixedly connected to the middle position of the top of the adjusting disk, a button is vertically slidably connected inside the rotating bracket, a push spring is fixedly connected between the bottom of the button and the inner bottom surface of the rotating bracket, and hinge strips are fixedly connected around the button, and the four hinge strips correspond to the four strip grooves one by one; One end of the hinged bar passes through the rotating bracket and is hinged with an L-shaped connecting rod. The middle part of the L-shaped connecting rod is movably connected to the top of the adjustment disk. One end of the L-shaped connecting rod is hingedly installed with the top of the corresponding adjustment pin.

[0008] Preferably, a mounting bearing is fixedly connected between the inner ring of the measuring bracket and the outer ring of the adjusting disk; The inner ring of the measuring bracket is slidably connected with four spring rods at equal intervals along the circumference, one end of the spring rod is fixedly connected with a limiting ball, the outer ring of the adjusting disk is provided with four limiting grooves at equal intervals along the circumference, and the four limiting balls correspond to the four limiting grooves one by one.

[0009] Preferably, the side wall of the rotating bracket is provided with four rectangular grooves equidistantly along the circumference, and the four hinge bars are movably inserted into the four rectangular grooves.

[0010] Preferably, a sliding pin is symmetrically fixedly connected to the top of the adjusting pin, and a waist-shaped groove is symmetrically opened at one end of the L-shaped connecting rod away from the hinge bar, and the sliding pin is slidably connected inside the adjacent waist-shaped groove; A cushion block is symmetrically rotatably connected to the middle of the L-shaped connecting rod, and the bottom of the cushion block is fixedly connected to the top of the adjusting disk.

[0011] A method for using a criminal investigation measurement device based on criminal science comprises the following steps: S1. When in use, hold the measuring bracket, and then rotate the worm and the worm wheel to mesh and drive, so that the worm wheel rotates with the gear rod. At this time, the gear rod meshes and drives with the two measuring tooth plates inside the detection box, so that the two measuring tooth plates move back to back, and the length of the footprint is measured by the distance between the ends of the two measuring tooth plates; S2. At the same time, during the rotation of the gear rod, the lower part of the gear rod meshes with the bevel gear rod through the bevel gear, and the bevel gear rod meshes with the bevel gear ring to drive the bevel gear ring to rotate in the opposite direction of the gear rod. At this time, the main measuring rod on the movable ring and the slave measuring rod on the gear rod rotate in opposite directions, so that the main measuring rod and the slave measuring rod are running in an open trend at the lower part of the movable sleeve to measure the width of the footprint; S3. When the measuring tooth plate on the left side of the detection box extends out, the measuring tooth plate moves toward the side wall of the adjusting disk with the adjusting pressure rod on the surface, and the adjusting pressure block inside the strip groove is pressed by the adjusting pressure rod to move. With the cooperation of the oblique clamping teeth and the clamping tooth plate, the adjusting pressure block can only move in one direction inside the strip groove and self-lock, and the current footprint measurement result is recorded; S4. After the measurement of one footprint is completed, the worm is reversed to retract the measuring tooth plate, and then the adjusting disk is turned on the measuring bracket to rotate, and the position of the bar groove on the adjusting disk is switched to prepare for the next footprint measurement. In this way, the measured dimensions of multiple footprints are recorded through the adjusting disk; S5. Finally, when it is necessary to call up the measurement record, first turn the locking screw to move the U-shaped bracket inside the transmission sleeve. At this time, the worm is disengaged from the worm wheel, so that the gear rod is no longer in a locked state. At this time, the two measuring tooth plates move in opposite directions under the action of the reset spring, and after the left measuring tooth plate carries the adjusting pressure rod into the corresponding strip groove, since the adjusting pressure block is in a limited state, after the adjusting pressure rod contacts the corresponding adjusting pressure block, the adjusting pressure rod and the measuring tooth plate stop moving. At this time, the two measuring tooth plates are at the extended length during measurement, so that the measuring tooth plate, the main measuring rod and the slave measuring rod can reproduce the state during footprint measurement.

[0012] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, through the coordinated use of components such as a measuring bracket, a detection box and a measuring mechanism, the handheld measuring bracket is moved to the footprint position with the measuring box, and the worm is rotated to operate the measuring mechanism. During this process, the two measuring tooth plates move back to back to measure the length of the footprint, and at the same time, the main measuring rod and the slave measuring rod are moved in an open trend to measure the width of the footprint, thereby realizing the synchronous measurement of the length and width of the footprint, which is easy to operate.

[0013] In the present invention, through the coordinated use of components such as the measuring bracket, the measuring mechanism and the adjusting and recording mechanism, when the measuring mechanism is in the process of measuring footprints, the adjusting pressure rod is inserted into the inside of the adjusting disk to enable the adjusting and recording mechanism to operate. At this time, the adjusting pressure block inside the adjusting and recording mechanism is automatically locked in the current state, which is convenient for later viewing of the measurement records and improves ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A side view of the position of the measuring bracket and the detection box of the present invention; Figure 2 It is a front view of the position of the measuring bracket and the detection box of the present invention; Figure 3 It is a cross-sectional view of a local position of the detection box and the movable groove of the present invention; Figure 4 It is a side view of a local position of the movable sleeve and the movable ring of the present invention; Figure 5 It is a side cross-sectional view of the movable sleeve and the local position of the measuring rod of the present invention; Figure 6 It is a cross-sectional view of a local position of a bevel gear and a bevel gear ring of the present invention; Figure 7 It is a cross-sectional view of a local position of the transmission sleeve and the worm of the present invention; Figure 8 It is a side sectional view of the local position of the adjusting disk and the adjusting pressure rod of the present invention; Fig. 9 It is a side sectional view of the local position of the adjustment disk and the strip groove of the present invention; Fig.10 For the present invention Fig. 9 A magnified view of the structure in the middle.

[0015] In the figure: 1, measuring bracket; 2, detection box; 3, measuring mechanism; 301, movable groove; 302, gear rod; 303, measuring tooth plate; 304, adjusting pressure rod; 305, movable sleeve; 306, movable ring; 307, bevel gear ring; 308, bevel gear; 309, bevel gear rod; 310, main measuring rod; 311, slave measuring rod; 312, transmission sleeve; 313, worm gear; 314, U-shaped bracket; 3 15. Worm; 316. Locking screw; 317. Through slot; 4. Adjustment and recording mechanism; 401. Adjustment disk; 402. Strip slot; 403. Adjustment pressure block; 404. Compression spring; 405. Oblique clamping teeth; 406. Clamping tooth plate; 407. Extrusion spring; 408. Adjustment pin; 409. Rotating bracket; 410. Button; 411. Push spring; 412. Articulated strip; 413. L-shaped connecting rod. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figures 1 to 10 The present invention provides a technical solution: a criminal investigation measurement device based on criminal science, including a measurement bracket 1, an end of the measurement bracket 1 is fixedly connected to a detection box 2, and the interior of the detection box 2 is movably connected to a measuring mechanism 3.

[0018] The middle part of the measuring bracket 1 is movably connected with an adjusting and recording mechanism 4 that cooperates with the measuring mechanism 3 .

[0019] The measuring mechanism 3 includes a movable groove 301, which is opened inside the detection box 2. A gear rod 302 is rotatably connected inside the movable groove 301. Measuring tooth plates 303 are meshed on both sides of the gear rod 302. The side walls of the measuring tooth plates 303 are slidably connected to the inner walls of the movable groove 301. The two measuring tooth plates 303 are set in opposite directions. The end of the left measuring tooth plate 303 is fixedly connected to an adjusting pressure rod 304 that cooperates with the adjusting and recording mechanism 4.

[0020] The bottom of the detection box 2 is fixedly connected with a movable sleeve 305, the bottom of the gear rod 302 penetrates the detection box 2 and is rotatably connected to the inner bottom surface of the movable sleeve 305, the inner bottom surface of the movable sleeve 305 is rotatably connected with a movable ring 306, the movable ring 306 is coaxially arranged with the gear rod 302, the top of the movable ring 306 is fixedly connected with a bevel gear ring 307, the lower part of the gear rod 302 is fixedly sleeved with a bevel gear 308 matched with the bevel gear ring 307, the inner wall of the movable sleeve 305 is rotatably connected with a bevel gear rod 309, and the bevel gear rod 309 is arranged between the bevel gear ring 307 and the bevel gear 308. It should be noted that: when the gear rod 302 rotates with the bevel gear 308 and meshes with the bevel gear rod 309, the bevel gear rod 309 meshes with the bevel gear ring 307 and rotates with the movable ring 306 in the opposite direction, and at this time, the movable ring 306 rotates in the opposite direction to the gear rod 302.

[0021] The side wall of the movable ring 306 is fixedly connected with the main measuring rod 310, and the side wall of the movable ring 306 is provided with a through slot 317, and the inside of the through slot 317 is slidably connected with the slave measuring rod 311, and the slave measuring rod 311 is fixedly connected to the surface of the gear rod 302. It should be noted that: the bottoms of the two measuring tooth plates 303 at the opposite ends are fixedly connected with measuring cone blocks, and the bottoms of the measuring cone blocks are arranged at the same level as the main measuring rod 310 and the slave measuring rod 311, so that the two measuring tooth plates 303 can accurately measure the length of the footprint, and the slave measuring rod 311 and the main measuring rod 310 can cooperate to measure the width of the footprint; because the length-width ratio of the shoe size of the footprint is fixed, and under the action of the gear rod 302, the device measures the length and width of the footprint synchronously, so when the length is measured, the width value under the same ratio can be measured at the same time, for example, when measuring the width of a 40-yard footprint and the width of a 45-yard footprint, the distance between the main measuring rod 310 and the slave measuring rod 311 after unfolding is changed year-on-year.

[0022] A transmission sleeve 312 is fixedly connected to the top of the detection box 2, the top of the gear rod 302 passes through the detection box 2 and is rotatably connected to the inner top surface of the transmission sleeve 312, the upper part of the gear rod 302 is fixedly sleeved with a worm wheel 313, the inside of the transmission sleeve 312 is slidably connected to a U-shaped bracket 314, a worm 315 is rotatably connected between the two ends of the U-shaped bracket 314, the side wall of the worm 315 is meshed with the side wall of the worm wheel 313, the side wall of the transmission sleeve 312 is rotatably connected to a locking screw 316, one end of the locking screw 316 passes through the transmission sleeve 312 and is rotatably connected to the middle part of the U-shaped bracket 314. It should be noted that: a movable groove is provided on the inner bottom surface of the transmission sleeve 312, and a movable block is fixedly connected to the bottom of the U-shaped bracket 314, and the movable block is slidably connected to the inside of the movable groove; a transmission bearing is fixedly connected between one end of the locking screw 316 and the surface of the U-shaped bracket 314, so that during the rotation of the locking screw 316, it can only move the U-shaped bracket 314 horizontally inside the transmission sleeve 312 to avoid interference.

[0023] In this embodiment, Figures 1 to 10 As shown, the top of the measuring tooth plate 303 is provided with scale lines.

[0024] The inner wall of the movable groove 301 is symmetrically provided with sliding grooves, the side wall of the measuring tooth plate 303 is fixedly connected with a slider, the slider is slidably connected inside the corresponding sliding groove, and a reset spring is fixedly connected between the inner wall of the sliding groove and the side wall of the slider.

[0025] In this embodiment, Figures 1 to 10 As shown, the side wall of the lower part of the movable sleeve 305 is provided with an arc groove, and the main measuring rod 310 and the slave measuring rod 311 are both movably inserted in the arc groove. It should be noted that the arc groove is provided to avoid interference between the main measuring rod 310 and the slave measuring rod 311 and the movable sleeve 305 during rotation.

[0026] In this embodiment, Figures 1 to 10 As shown, the adjusting and recording mechanism 4 includes an adjusting disk 401, which is rotatably connected to the inside of the measuring bracket 1, and four strip grooves 402 are equidistantly opened inside the adjusting disk 401 along the circumference. An adjusting pressure block 403 cooperating with the measuring mechanism 3 is slidably connected inside the strip groove 402, and a compression spring 404 is fixedly connected between the side wall of the adjusting pressure block 403 and the inner wall of the strip groove 402, and an oblique clamping tooth 405 is fixedly connected to the top of the adjusting pressure block 403. It should be noted that when the adjusting pressure rod 304 on the measuring mechanism 3 moves, the adjusting pressure rod 304 will press the adjusting pressure block 403 to move inside the strip groove 402; the elastic force of the compression spring 404 is greater than the elastic force of the reset spring on the side wall of the measuring tooth plate 303, and when the reset spring moves the measuring tooth plate 303 and the adjusting pressure rod 304 toward the adjusting pressure block 403, the adjusting pressure block 403 will not slide inside the strip groove 402.

[0027] The top of the strip groove 402 is slidably connected with a clamping tooth plate 406 that matches the oblique clamping tooth 405, a pressing spring 407 is fixedly connected between the top of the clamping tooth plate 406 and the inner top surface of the strip groove 402, and an adjustment pin 408 is fixedly connected to the middle position of the top of the clamping tooth plate 406. It should be noted that the teeth of the oblique clamping tooth 405 and the teeth of the clamping tooth plate 406 are both configured as oblique teeth, so that the adjustment pressure block 403 can only move in one direction inside the strip groove 402, achieving a one-way self-locking effect during the movement of the adjustment pressure block 403.

[0028] A rotating bracket 409 is fixedly connected to the middle position of the top of the adjusting disk 401, and a button 410 is vertically slidably connected inside the rotating bracket 409. A push spring 411 is fixedly connected between the bottom of the button 410 and the inner bottom surface of the rotating bracket 409. The button 410 is fixedly connected with hinge strips 412 all around, and the four hinge strips 412 correspond one by one to the four bar grooves 402.

[0029] One end of the hinged bar 412 passes through the rotating bracket 409 and is hinged with an L-shaped connecting rod 413. The middle part of the L-shaped connecting rod 413 is movably connected to the top of the adjusting disk 401, and one end of the L-shaped connecting rod 413 is hingedly installed with the top of the corresponding adjusting pin 408. It should be noted that the four L-shaped connecting rods 413 correspond to the four adjusting pins 408 one by one. When the button 410 is pressed, the hinged bar 412 moves down with the corresponding end of the L-shaped connecting rod 413. Under the principle of lever, the other end of the L-shaped connecting rod 413 moves up with the corresponding adjusting pin 408 on the top plate of the adjusting disk 401, so that the adjusting pin 408 moves up with the clamping tooth plate 406 and releases the clamping connection with the oblique clamping tooth 405.

[0030] In this embodiment, Figures 1 to 10 As shown, a mounting bearing is fixedly connected between the inner ring of the measuring bracket 1 and the outer ring of the adjusting disk 401 .

[0031] The inner ring of the measuring bracket 1 is equidistantly connected to four spring rods for sliding connection along the circumference, one end of the spring rod is fixedly connected to a limiting ball, and the outer ring of the adjusting disk 401 is equidistantly provided with four limiting grooves along the circumference, and the four limiting balls correspond to the four limiting grooves one by one. It should be noted that: the spring rod is plugged in with the limiting groove, so that the adjusting disk 401 in the middle of the measuring bracket 1 can be stably limited, and the position of the adjusting disk 401 can be adjusted conveniently; and magnetic blocks can be set on the surface of the spring rod and the inside of the limiting groove to improve the stability of the cooperation between the spring rod and the limiting groove.

[0032] In this embodiment, Figures 1 to 10 As shown, the side wall of the rotating bracket 409 is provided with four rectangular grooves equidistantly along the circumference, and four hinge bars 412 are movably inserted into the four rectangular grooves.

[0033] In this embodiment, Figures 1 to 10 As shown, a sliding pin is symmetrically fixedly connected to the top of the adjustment pin 408, and waist grooves are symmetrically opened at one end of the L-shaped connecting rod 413 away from the hinge strip 412, and the sliding pin is slidably connected inside the adjacent waist grooves.

[0034] A cushion block is symmetrically rotatably connected to the middle of the L-shaped connecting rod 413 , and the bottom of the cushion block is fixedly connected to the top of the adjustment disk 401 .

[0035] In this embodiment, Figures 1 to 10 As shown, a method for using a criminal investigation measurement device based on criminal science includes the following steps: S1. When in use, hold the measuring bracket 1, then rotate the worm 315 to mesh with the worm wheel 313, so that the worm wheel 313 rotates with the gear rod 302. At this time, the gear rod 302 meshes with the two measuring tooth plates 303 inside the detection box 2, so that the two measuring tooth plates 303 move back to back, and the length of the footprint is measured by the distance between the ends of the two measuring tooth plates 303; S2. At the same time, during the rotation of the gear rod 302, the lower part of the gear rod 302 meshes with the bevel gear rod 309 through the bevel gear 308, and the bevel gear rod 309 meshes with the bevel gear ring 307 to drive the bevel gear ring 307 to rotate the movable ring 306 in the opposite direction of the gear rod 302. At this time, the main measuring rod 310 on the movable ring 306 and the slave measuring rod 311 on the gear rod 302 rotate in opposite directions, so that the main measuring rod 310 and the slave measuring rod 311 are running in an open trend at the lower part of the movable sleeve 305 to measure the width of the footprint; S3, when the measuring tooth plate 303 on the left side of the detection box 2 is extended, the measuring tooth plate 303 moves toward the side wall of the adjusting disk 401 with the adjusting pressure rod 304 on the surface, and the adjusting pressure block 403 inside the strip groove 402 is pressed by the adjusting pressure rod 304 to move. Under the cooperation of the oblique clamping teeth 405 and the clamping tooth plate 406, the adjusting pressure block 403 can only move in one direction inside the strip groove 402 and self-lock, and the current footprint measurement result is recorded; S4, after the measurement of one footprint is completed, the worm 315 is reversed to retract the measuring tooth plate 303, and then the adjusting disk 401 is turned on the measuring bracket 1 to rotate, and the position of the bar groove 402 on the adjusting disk 401 is switched to prepare for the next footprint measurement. In this way, the measured dimensions of multiple footprints are recorded through the adjusting disk 401; S5. Finally, when it is necessary to call up the measurement record, first rotate the locking screw 316 to move the U-shaped bracket 314 inside the transmission sleeve 312. At this time, the worm 315 releases the engagement with the worm wheel 313, so that the gear rod 302 is no longer in a locked state. At this time, the two measuring tooth plates 303 move in opposite directions under the action of the reset spring, and after the left measuring tooth plate 303 carries the adjusting pressure rod 304 into the corresponding strip groove 402, since the adjusting pressure block 403 is in a limited state, after the adjusting pressure rod 304 contacts the corresponding adjusting pressure block 403, the adjusting pressure rod 304 and the measuring tooth plate 303 stop moving. At this time, the two measuring tooth plates 303 are at the extended length during measurement, so that the measuring tooth plate 303, the main measuring rod 310 and the slave measuring rod 311 reproduce the state during footprint measurement.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A criminal investigation measurement device based on criminal science, comprising a measurement bracket (1), characterized in that: The end of the measuring bracket (1) is fixedly connected to a detection box (2), and the interior of the detection box (2) is movably connected to a measuring mechanism (3); The middle part of the measuring bracket (1) is movably connected with an adjusting and recording mechanism (4) that cooperates with the measuring mechanism (3); The measuring mechanism (3) comprises a movable groove (301), the movable groove (301) is provided inside the detection box (2), a gear rod (302) is rotatably connected inside the movable groove (301), both sides of the gear rod (302) are meshed with measuring tooth plates (303), the side walls of the measuring tooth plates (303) are slidably connected to the inner wall of the movable groove (301), the two measuring tooth plates (303) are arranged in opposite directions, and the end of the left measuring tooth plate (303) is fixedly connected to an adjusting pressure rod (304) that cooperates with the adjusting and recording mechanism (4); The bottom of the detection box (2) is fixedly connected to a movable sleeve (305); the bottom of the gear rod (302) passes through the detection box (2) and is rotatably connected to the inner bottom surface of the movable sleeve (305); the inner bottom surface of the movable sleeve (305) is rotatably connected to a movable ring (306); the movable ring (306) is coaxially arranged with the gear rod (302); the top of the movable ring (306) is fixedly connected to a bevel gear ring (307); the lower part of the gear rod (302) is fixedly sleeved with a bevel gear (308) matching the bevel gear ring (307); the inner wall of the movable sleeve (305) is rotatably connected to a bevel gear rod (309); the bevel gear rod (309) is arranged between the bevel gear ring (307) and the bevel gear (308); A main measuring rod (310) is fixedly connected to the side wall of the movable ring (306); a through slot (317) is formed on the side wall of the movable ring (306); a slave measuring rod (311) is slidably connected inside the through slot (317); and the slave measuring rod (311) is fixedly connected to the surface of the gear rod (302); The top of the detection box (2) is fixedly connected to a transmission sleeve (312); the top of the gear rod (302) passes through the detection box (2) and is rotatably connected to the inner top surface of the transmission sleeve (312); the upper part of the gear rod (302) is fixedly sleeved with a worm wheel (313); the interior of the transmission sleeve (312) is slidably connected to a U-shaped bracket (314); a worm (315) is rotatably connected between the two ends of the U-shaped bracket (314); the side wall of the worm (315) is meshed with the side wall of the worm wheel (313); the side wall of the transmission sleeve (312) is rotatably connected to a locking screw (316); one end of the locking screw (316) passes through the transmission sleeve (312) and is rotatably connected to the middle of the U-shaped bracket (314).

2. The criminal investigation measurement device based on criminal science according to claim 1, characterized in that: The top of the measuring tooth plate (303) is provided with scale lines; The inner wall of the movable groove (301) is symmetrically provided with sliding grooves, the side wall of the measuring tooth plate (303) is fixedly connected with a sliding block, the sliding block is slidably connected inside the corresponding sliding groove, and a return spring is fixedly connected between the inner wall of the sliding groove and the side wall of the sliding block.

3. A criminal investigation measurement device based on criminal science according to claim 2, characterized in that: An arc-shaped groove is formed on the side wall of the lower portion of the movable sleeve (305), and the main measuring rod (310) and the slave measuring rod (311) are both movably inserted into the arc-shaped groove.

4. The criminal investigation measurement device based on criminal science according to claim 3, characterized in that: The adjusting and recording mechanism (4) comprises an adjusting disk (401), the adjusting disk (401) being rotatably connected to the inside of the measuring bracket (1), the inside of the adjusting disk (401) being provided with four strip grooves (402) equidistantly arranged along the circumference, the inside of the strip groove (402) being slidably connected to an adjusting pressure block (403) cooperating with the measuring mechanism (3), a compression spring (404) being fixedly connected between the side wall of the adjusting pressure block (403) and the inner wall of the strip groove (402), and an oblique clamping tooth (405) being fixedly connected to the top of the adjusting pressure block (403); The top of the strip groove (402) is slidably connected to a clamping tooth plate (406) that matches the oblique clamping tooth (405), a compression spring (407) is fixedly connected between the top of the clamping tooth plate (406) and the inner top surface of the strip groove (402), and an adjustment pin (408) is fixedly connected to the middle position of the top of the clamping tooth plate (406); A rotating bracket (409) is fixedly connected to the middle position of the top of the adjusting disk (401), a button (410) is vertically slidably connected inside the rotating bracket (409), a push spring (411) is fixedly connected between the bottom of the button (410) and the inner bottom surface of the rotating bracket (409), and hinge bars (412) are fixedly connected around the button (410), and the four hinge bars (412) correspond to the four bar-shaped grooves (402) one by one; One end of the hinged bar (412) passes through the rotating bracket (409) and is hingedly connected to an L-shaped connecting rod (413), the middle part of the L-shaped connecting rod (413) is movably connected to the top of the adjustment disk (401), and one end of the L-shaped connecting rod (413) is hingedly installed with the top of the corresponding adjustment pin (408).

5. The criminal investigation measurement device based on criminal science according to claim 4, characterized in that: A mounting bearing is fixedly connected between the inner ring of the measuring bracket (1) and the outer ring of the adjusting disk (401); The inner ring of the measuring bracket (1) is slidably connected to four spring rods at equal intervals along the circumference, one end of the spring rod is fixedly connected to a limiting ball, and the outer ring of the adjusting disk (401) is provided with four limiting grooves at equal intervals along the circumference, and the four limiting balls correspond to the four limiting grooves one by one.

6. A criminal investigation measurement device based on criminal science according to claim 5, characterized in that: The side wall of the rotating bracket (409) is provided with four rectangular grooves at equal intervals along the circumference, and the four hinge bars (412) are movably inserted into the four rectangular grooves.

7. A criminal investigation measurement device based on criminal science according to claim 6, characterized in that: The top of the adjusting pin (408) is symmetrically fixedly connected with a sliding pin, and one end of the L-shaped connecting rod (413) away from the hinge bar (412) is symmetrically provided with a waist-shaped groove, and the sliding pin is slidably connected inside the adjacent waist-shaped groove; A cushion block is symmetrically rotatably connected to the middle of the L-shaped connecting rod (413), and the bottom of the cushion block is fixedly connected to the top of the adjustment disk (401).

8. The method for using the criminal investigation measurement device based on criminal science according to claim 7 comprises the following steps: S1. When in use, the measuring bracket (1) is held in hand, and the worm (315) is rotated to mesh with the worm wheel (313), so that the worm wheel (313) rotates with the gear rod (302). At this time, the gear rod (302) is meshed with the two measuring tooth plates (303) inside the detection box (2), so that the two measuring tooth plates (303) move back to back, and the length of the footprint is measured by the distance between the ends of the two measuring tooth plates (303); S2. During the rotation of the gear rod (302), the lower portion of the gear rod (302) meshes with the bevel gear rod (309) through the bevel gear (308), and the bevel gear rod (309) meshes with the bevel gear ring (307) to transmit the bevel gear ring (307) and the movable ring (306) to rotate in the opposite direction of the gear rod (302). At this time, the main measuring rod (310) on the movable ring (306) and the slave measuring rod (311) on the gear rod (302) rotate in opposite directions, so that the main measuring rod (310) and the slave measuring rod (311) are opened at the lower portion of the movable sleeve (305) to measure the width of the footprint; S3, when the measuring tooth plate (303) on the left side of the detection box (2) extends out, the measuring tooth plate (303) moves toward the side wall of the adjusting disk (401) with the adjusting pressure rod (304) on the surface, and the adjusting pressure block (403) inside the strip groove (402) is pressed by the adjusting pressure rod (304) to move, and under the cooperation of the oblique clamping teeth (405) and the clamping tooth plate (406), the adjusting pressure block (403) can only move in one direction inside the strip groove (402) and self-lock, and the current footprint measurement result is recorded; S4, when the measurement of one footprint is completed, the worm (315) is reversed to retract the measuring tooth plate (303), and then the adjusting disk (401) is turned on the measuring bracket (1) to switch the position of the bar groove (402) on the adjusting disk (401) to prepare for the next footprint measurement. In this way, the measured dimensions of multiple footprints are recorded through the adjusting disk (401); S5. Finally, when it is necessary to call out the measurement record, firstly, the locking screw (316) is rotated to move the U-shaped bracket (314) inside the transmission sleeve (312). At this time, the worm (315) is released from the meshing with the worm wheel (313), so that the gear rod (302) is no longer in a locked state. At this time, the two measuring tooth plates (303) move in opposite directions under the action of the return spring, and after the left measuring tooth plate (303) is inserted into the corresponding strip groove (402) with the adjusting pressure rod (304), since the adjusting pressure block (403) is in a limited state, after the adjusting pressure rod (304) contacts the corresponding adjusting pressure block (403), the adjusting pressure rod (304) and the measuring tooth plate (303) stop moving. At this time, the two measuring tooth plates (303) are at the extended length during measurement, so that the measuring tooth plate (303), the main measuring rod (310) and the slave measuring rod (311) reproduce the state of the footprint measurement.

Images