Power measuring system for identifying attributes of electric vehicle in trace judicial expertise

Abstract

The invention belongs to the technical field of vehicle testing, and particularly relates to a power measuring system for electric vehicle attribute identification in trace judicial expertise, which comprises a power measuring device, a speed detection module and a control module, the device further comprises a base which is arranged on one side of the power measuring device, and the base is in a U shape. A support is slidably connected to the top of the base, and an electric push rod is arranged between one side of the support and the base. The wire clamp clamps a power supply wire harness of a rear wheel of the electric vehicle, and then a vehicle accelerator is twisted to enable the rear wheel to rotate at a high speed; when current exists in the clamped wire harness, the wire clamp performs detection, the magnitude of the current displayed by the control module, the number of batteries stored in the vehicle and the specified voltage are also used as test bases, and the actual test power of the vehicle is obtained through a conventional power calculation mode according to the current and the voltage and is used as an identification base; the power of the vehicle in the no-load state is tested through the data calculation mode, and the vehicle power testing efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle testing, and in particular is a dynamometer system used for attribute identification of electric vehicles in forensic trace identification. Background Art

[0002] "Vehicle" refers to motor vehicles and non-motor vehicles. The property identification of electric vehicles needs to be carried out according to certain standards. The maximum speed of electric vehicles should not exceed 20km / h, the total vehicle weight should not exceed 40Kg, and it must have good pedal riding function. The pedaling distance in 30 minutes should not be less than 7km; if it does not meet these standards, then it does not belong to the category of electric vehicles, nor does it belong to the category of non-motor vehicles; the results of the property identification of electric vehicles directly affect the material collection work of judicial identification, and in the detection of criminal cases and the handling of traffic accident cases, vehicle traces play a very important role. According to vehicle traces, the type of vehicle can be analyzed and inferred, providing clues for investigation and narrowing the scope of investigation; according to vehicle traces, the suspected vehicle can be inspected and identified to determine whether the vehicle traces at the scene are left by the suspected vehicle; During large-scale on-site identification, the dynamometer of an electric vehicle is large in size and inconvenient to use and move, which makes it unsuitable for on-site and rapid identification by identification personnel even if the data is accurate. Also, when an electric vehicle is collecting wheel marks, the dust and impurities on the wheels will seriously affect the sampling and collection of the marks. Summary of the invention

[0003] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a dynamometer system for electric vehicle attribute identification in forensic trace identification.

[0004] The technical solution adopted by the present invention to solve the technical problem is: the present invention proposes a dynamometer system for electric vehicle attribute identification in trace forensic identification, including a dynamometer device, a speed detection module and a control module; and also includes: A base, the base is arranged on one side of the dynamometer, and the base is U-shaped; a bracket is slidably connected to the top of the base, and an electric push rod is arranged between one side of the bracket and the base; a groove is opened on one side of the bracket, and a weighing plate is slidably connected to the bottom of the groove through a spring, the weighing plate is located at the bottom of the groove and rises and falls, a gravity sensor is arranged between the weighing plate and the groove, and the groove is engaged with both ends of the electric wheel axle; a fixed groove is arranged in the groove, and a fixed block is slidably connected in the fixed groove through a spring, an electromagnet is arranged in the fixed groove, and the electromagnet is energized to adsorb the fixed block; a rotating belt is rotatably connected to the base, the rotating belt is arc-shaped, one end of the rotating belt is away from the dynamometer, and the other end is close to the dynamometer, and the rotating belt is connected to a speed detection module installed in the base, and detection paper is wound around the rotating belt; A telescopic plate is slidably connected to the outer wall of the dynamometer device through a spring, and the telescopic plate is telescoped into the dynamometer device; a wire clamp is connected to the bracket through a spring, and the wire clamp is used to detect the current in the circuit, and the wire clamp clamps the power supply circuit of the electric vehicle.

[0005] Preferably, the end of the telescopic plate away from the dynamometer is rotatably connected to a rotating shaft, and a torsion spring is provided between the rotating shaft and the telescopic plate; an extrusion groove is provided on the surface of the rotating shaft, the extrusion groove is horizontally arranged, and an extrusion block is slidably connected to the extrusion groove through a spring, and a dry cloth and a wet cloth are provided on the surface of the rotating shaft, respectively, and the dry cloth and the wet cloth are respectively located on both sides of the extrusion block, and the dry cloth is located above the wet cloth, and the dry cloth, the wet cloth and the extrusion wheel all contact the surface of the wheel; a transmission wheel is rotatably connected to one side of the bracket, and the transmission wheel is connected to a driving member arranged on one side of the bracket through an electromagnetic clutch, and the transmission wheel contacts the hub of the electric wheel, and a speed sensor is provided on one side of the bracket, and the speed sensor is used to detect the speed of the transmission wheel.

[0006] Preferably, a hydraulic tank is provided inside the rotating shaft, and cleaning agent is stored in the hydraulic tank. A hydraulic block is slidably connected to the hydraulic tank through a spring, and a No. 1 rod is evenly provided at the bottom of the extrusion block, and the No. 1 rod contacts the hydraulic block. Water outlet pipes are evenly provided in the rotating shaft, and one end of the water outlet pipe extends into the wet cloth, and the other end extends into the hydraulic tank.

[0007] Preferably, an extrusion bag is provided in the rotating shaft, and desiccant is stored in the extrusion bag, a nozzle is provided in the extrusion bag, one end of the nozzle extends into the dry cloth, and a No. 1 rod is arranged at the bottom of the extrusion block, one of which contacts the hydraulic block and the other contacts the extrusion bag; leakage holes are evenly opened in the dry cloth, one end of the leakage hole contacts the nozzle, and the other end faces outside the dry cloth, and the nozzle sprays the desiccant into the leakage hole.

[0008] Preferably, the surface of the extrusion block away from the first rod is evenly rotatably connected with a cam, and the outer ring of the cam contacts the tire surface, and the cam is located at the edge of both sides of the extrusion block.

[0009] Preferably, an inclined plate is provided at the bottom of the telescopic plate, and one end of the inclined plate is rotatably connected to a coating shaft. A sponge is provided at a position of the inclined plate near the outer ring of the coating shaft. The sponge absorbs the paint stored in the inclined plate and coats it on the surface of the coating shaft. The coating shaft is located below the wet cloth.

[0010] Preferably, the base is rotatably connected to a winding shaft via a torsion spring, and one end of the detection paper on the rotating belt is wound around the winding shaft; protrusions are hinged at both side edges of the rotating belt via torsion springs, and the surface of the protrusions contacting the tire is a stepped surface.

[0011] Preferably, a spiral winding plate is provided on the base, and one end of the winding plate is close to the winding shaft, and the other end is close to the rotating belt. The detection paper on the rotating belt passes through the winding plate and is wound on the winding shaft.

[0012] Preferably, sliding rods are provided on both sides of the bracket, and the sliding rods are located on both sides of the wheels. The sliding rods are slidably connected with sliders, and the sliders are fixed to the sliding rods by bolts; the sides of the sliders close to each other are slidably connected with clamping blocks, and the number of clamping blocks on each slider is two, and the clamping blocks on each slider are tightened and clamped by bolts.

[0013] Preferably, one side of the clamping block is slidably connected with an extension block, and the extension block is located between adjacent sliding blocks.

[0014] The beneficial effects of the present invention are as follows: 1. The dynamometer system for electric vehicle attribute identification in forensic trace identification described in the present invention is that after the vehicle is weighed and kept still, a wire clamp is used to clamp the power supply wiring harness of the rear wheel of the electric vehicle, and then the throttle of the vehicle is twisted to rotate the rear wheel at high speed; when there is current in the clamped wiring harness, the wire clamp detects it and displays the current size through the control module. The number of batteries stored in the vehicle and the specified voltage are also used as the basis for testing. According to the current and voltage, the actual test power of the vehicle is calculated by a conventional power calculation method and used as the basis for identification; the power test of the vehicle in the no-load state is carried out by the above data calculation method, thereby accelerating the efficiency of the vehicle power test.

[0015] 2. The dynamometer system for electric vehicle attribute identification in forensic trace identification described in the present invention has the following characteristics: when the dynamometer moves close to the wheel, the telescopic plate approaches the wheel, and when the wheel is lifted up by the bracket, the telescopic plate contacts the wheel and is squeezed, so that the telescopic plate retracts into the outer wall of the dynamometer; during the rotation of the wheel, the telescopic plate keeps contacting the wheel while scraping off dust, mud and other impurities on the surface of the wheel, thereby improving the cleanliness of the tire surface and avoiding slipping between the wheel and the rotating belt due to dust, thereby improving the accuracy of vehicle testing; moreover, after the tire is cleaned, the traces left on the test paper can be made clearer, reducing the degree of influence by impurities and improving the accuracy of identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 is a stereogram of the present invention; Figure 2 is a state diagram of the test wheel of the present invention; Figure 3 It is a schematic diagram of the wheel being fixed by a fixing block; Figure 4 It is the internal structure diagram of the fixed slot; Figure 5 This is a state diagram of the test device when cleaning the wheel with a wet cloth; Figure 6 It is a side view when collecting wheel marks; Figure 7 This is the front view when wheel marks were collected; Figure 8 It is the internal schematic diagram of the leak hole; Fig. 9 is a cross-sectional view of the telescopic plate; Fig.10 This is a state diagram of the detection paper passing through the winding plate; In the figure: dynamometer 1, speed detection module 11, control module 12, base 13, bracket 14, electric push rod 15, groove 2, weighing plate 21, gravity sensor 22, fixed groove 23, fixed block 24, electromagnet 25, rotating belt 26, detection paper 27, telescopic plate 28, wire clamp 29, rotating shaft 3, extrusion groove 31, extrusion block 32, dry cloth 33, wet cloth 34, transmission wheel 35, driving member 36, speed sensor 37, hydraulic tank 4, hydraulic block 41, No. 1 rod 42, water outlet pipe 43, extrusion capsule 44, nozzle 45, leakage hole 46, cam 47, inclined plate 5, smear shaft 51, sponge 52, winding shaft 53, protrusion 54, winding plate 55, slide bar 6, slide block 61, clamp block 62, extension block 63. DETAILED DESCRIPTION

[0018] 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 technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1: A dynamometer system for electric vehicle attribute identification in trace forensic identification, as shown in the accompanying drawings of the specification Figure 1-Figure 10 As shown, it includes a dynamometer 1, a speed detection module 11 and a control module 12; the speed detection module 11 is a conventional instrument for detecting the wheel speed, and the control module 12 is a conventional controller for controlling the operation of the dynamometer system; and also includes: A base 13, the base 13 is arranged on one side of the dynamometer 1, and the base 13 is U-shaped; a bracket 14 is slidably connected to the top of the base 13, and an electric push rod 15 is arranged between one side of the bracket 14 and the base 13; a groove 2 is opened on one side of the bracket 14, and a weighing plate 21 is slidably connected to the bottom of the groove 2 through a spring, the weighing plate 21 is located at the bottom of the groove 2 and rises and falls, a gravity sensor 22 is arranged between the weighing plate 21 and the groove 2, and the groove 2 is engaged with both ends of the electric wheel axle; a fixed groove 23 is arranged in the groove 2, and a fixed block 24 is slidably connected in the fixed groove 23 through a spring, an electromagnet 25 is arranged in the fixed groove 23, and the electromagnet 25 is energized to adsorb the fixed block 24; a rotating belt 26 is rotatably connected to the base 13, the rotating belt 26 is arc-shaped, one end of the rotating belt 26 is away from the dynamometer 1, and the other end is close to the dynamometer 1, and the rotating belt 26 is connected to the speed detection module 11 installed in the base 13, and a detection paper 27 is wound around the rotating belt 26; The telescopic plate 28 is slidably connected to the outer wall of the dynamometer 1 through a spring, and the telescopic plate 28 is telescoped into the dynamometer 1; the bracket 14 is connected to a wire clamp 29 through a spring, and the wire clamp 29 is used to detect the current in the circuit, and the wire clamp 29 clamps the electric vehicle power supply circuit; The electric push rod 15 is a conventional electric jack or lifting device; the gravity sensor 22 is a conventional electrical appliance for weighing, and the electromagnet 25 is used to absorb the fixed block 24, and the part near the electromagnet 25 and the fixed block 24 in the fixed groove 23 is subjected to magnetic isolation treatment to prevent the on and off of the electromagnet 25 from affecting the operation of the dynamometer 1; the rotating belt 26 is a conventional conveyor belt. When the throttle of the electric vehicle is twisted, the rear wheel of the electric vehicle drives the tire to rotate, and the tire is in close contact with the rotating belt 26 through the detection paper 27, so that the tire drives the rotating belt 26 and the detection paper 27 to rotate; the wire clamp 29 is a tool for measuring the current in the wire harness in a conventional current clamp. When there is current in the clamped wire harness, the wire clamp 29 detects and displays the current size through the control module 12 as a basis for power testing; Specific work flow: When a large number of vehicle tests are required, the electric vehicle is first propped up and fixed with pedals, and the tester pushes the dynamometer 1 to move, and the dynamometer 1 drives the base 13 and the bracket 14 to move, and the U-shaped recessed part of the base 13 is moved to below the rear wheel of the electric vehicle; then, the groove 2 in the bracket 14 is aligned with the two ends of the rear wheel axle of the electric vehicle, and the base 13 drives the bracket 14 to approach the wheel, so that the two ends of the rear wheel axle of the electric vehicle are inserted deep into the groove 2 and contact the surface of the weighing plate 21. At this point, the preparation work before the vehicle test is completed, the preparation work is simple and fast, and the vehicle test efficiency is accelerated, thereby improving the efficiency of the dynamometer system; During the vehicle weighing test, the electric push rod 15 is started, and the electric push rod 15 drives the bracket 14 to rise. The bracket 14 drives the gravity sensor 22, the weighing plate 21 and the rear wheel axle of the electric vehicle to rise through the groove 2, so as to achieve the purpose of lifting the electric vehicle from the rear wheel for weighing. Because the rear wheel of the electric vehicle is a driving wheel containing a motor, and the battery in the electric vehicle is also fixed at the rear of the electric vehicle, the weight of the electric vehicle is concentrated at the rear of the electric vehicle. By lifting the rear of the electric vehicle for weighing, the effect of quickly and easily testing the weight of the electric vehicle can be achieved. For example, a vehicle with a weight less than 40 kilograms is judged as a non-motor vehicle, and a vehicle with a weight greater than 40 kilograms is judged as a motor vehicle. There is no need to push the electric vehicle onto the weighing instrument for weighing and other cumbersome steps, thereby improving the vehicle testing efficiency and further improving the working efficiency of the dynamometer system. Furthermore, after the rear wheel axle of the electric vehicle passes through the fixing block 24 and contacts the weighing plate 21, the electromagnet 25 is energized to adsorb the fixing block 24, and the fixing block 24 rises to close the groove 2, so that the rear wheel axle of the electric vehicle is stabilized on the weighing plate 21 by the fixing block 24, thereby increasing the weighing accuracy and fixing the rear of the electric vehicle, improving the stability of the vehicle during testing, and thus improving the accuracy of the vehicle testing; When testing vehicle power, two test methods can be used: In the no-load test, the vehicle is weighed and left still, the power supply harness of the rear wheel of the electric vehicle is clamped with the wire clamp 29, and then the throttle of the vehicle is twisted to make the rear wheel rotate at high speed; when there is current in the clamped harness, the wire clamp 29 detects it and displays the current through the control module 12. The number of batteries stored in the vehicle and the specified voltage are also used as the test basis. According to the current and voltage, the actual test power of the vehicle is obtained through the conventional power calculation method and used as the identification basis; the power test of the vehicle in the no-load state is carried out by the above data calculation method to speed up the vehicle power test efficiency; Load-bearing test: After the vehicle is tested without load, the electric push rod 15 drives the rear wheel of the electric vehicle to descend through the groove 2 until it contacts the detection paper 27 and the rotating belt 26; then, the electric push rod 15 continues to descend to a set height, so that the wheel contacts the rotating belt 26 closely through the detection paper 27, and the throttle is twisted to rotate the wheel, and the wheel drives the detection paper 27 and the rotating belt 26 to rotate. The speed detection module 11 tests the vehicle speed of the wheel through the rotating belt 26. On the one hand, while the detection paper 27 is in close contact with the wheel, the wheel leaves traces of the tire and tread on the detection paper 27, which increases the detection basis for judicial identification and improves the accuracy of the test results, thereby improving the accuracy of the dynamometer system for identifying the properties of the electric vehicle; on the other hand, by means of the wheel being pressed and in close contact with the rotating belt 26, the condition of the wheel driving on the road under load is simulated, and the simulation test work is completed in a simpler way, which speeds up the vehicle test efficiency and improves the accuracy of the vehicle test; Furthermore, when the dynamometer 1 moves close to the wheel, the telescopic plate 28 approaches the wheel, and when the wheel is lifted up by the bracket 14, the telescopic plate 28 contacts the wheel and is squeezed, so that the telescopic plate 28 retracts into the outer wall of the dynamometer 1; during the rotation of the wheel, the telescopic plate 28 keeps contacting the wheel while scraping off impurities such as dust and mud on the surface of the wheel, thereby improving the cleanliness of the tire surface and avoiding slippage between the wheel and the rotating belt 26 due to dust, thereby improving the accuracy of vehicle testing; moreover, after the tire is cleaned, the traces left on the detection paper 27 can be made clearer, reducing the degree of influence by impurities and improving the accuracy of identification.

[0020] Embodiment 2: On the basis of the first embodiment, the end of the telescopic plate 28 away from the dynamometer 1 is rotatably connected to the rotating shaft 3, and a torsion spring is provided between the rotating shaft 3 and the telescopic plate 28; an extrusion groove 31 is provided on the surface of the rotating shaft 3, the extrusion groove 31 is horizontally arranged, and an extrusion block 32 is slidably connected in the extrusion groove 31 through a spring, and a dry cloth 33 and a wet cloth 34 are provided on the surface of the rotating shaft 3, respectively, and the dry cloth 33 and the wet cloth 34 are respectively located on both sides of the extrusion block 32, and the dry cloth 33 is located above the wet cloth 34, and the dry cloth 33, the wet cloth 34 and the extrusion wheel are all in contact with the wheel surface; a transmission wheel 35 is rotatably connected to one side of the bracket 14, and the transmission wheel 35 is connected to a driving member 36 provided on one side of the bracket 14 through an electromagnetic clutch, and the transmission wheel 35 contacts the wheel hub of the electric wheel, and a speed sensor 37 is provided on one side of the bracket 14, and the speed sensor 37 is used to detect the speed of the transmission wheel 35; A hydraulic tank 4 is provided inside the rotating shaft 3, and a cleaning agent is stored in the hydraulic tank 4. A hydraulic block 41 is slidably connected to the hydraulic tank 4 through a spring, and a No. 1 rod 42 is evenly provided at the bottom of the extrusion block 32, and the No. 1 rod 42 contacts the hydraulic block 41, and a water outlet pipe 43 is evenly provided inside the rotating shaft 3, and one end of the water outlet pipe 43 extends into the wet cloth 34, and the other end extends into the hydraulic tank 4; The rotating shaft 3 is provided with an extrusion capsule 44, and a desiccant is stored in the extrusion capsule 44. A nozzle 45 is provided in the extrusion capsule 44, and one end of the nozzle 45 extends into the dry cloth 33. A No. 1 rod 42 is provided at the bottom of the extrusion block 32, one of which contacts the hydraulic block 41, and the other contacts the extrusion capsule 44. Leakage holes 46 are evenly opened in the dry cloth 33, one end of the leakage hole 46 contacts the nozzle 45, and the other end faces the outside of the dry cloth 33, and the nozzle 45 sprays the desiccant into the leakage hole 46. The electromagnetic clutch is a conventional friction clutch that generates a clamping force by electromagnetic force, and is used to connect the output shaft of the transmission wheel 35 and the driving member 36. The driving member 36 is a conventional driving device, such as a motor with forward and reverse functions. The driving member 36 drives the transmission wheel 35 forward and reverse through the electromagnetic clutch, so that the transmission wheel 35 drives the wheel to rotate counterclockwise or clockwise; the speed sensor 37 is a conventional electrical appliance for detecting the speed of the wheel; the desiccant is such as a silica gel desiccant, and the cleaning agent is a conventional solution for quickly cleaning tires, and the dry cloth 33 and the wet cloth 34 are conventional tire wiping agents. The wear-resistant tool of the present invention keeps the detection paper 27 away from the wet cloth 34 to prevent the wet cloth 34 from wetting the detection paper 27; the hydraulic tank 4 contains a one-way valve, so that when the hydraulic tank 4 is squeezed by the squeezing block 32, the cleaning agent is injected into the water outlet pipe 43, and when the squeezing block 32 is restored by the spring, air is sucked through the one-way valve instead of the water outlet pipe 43 to balance the pressure difference inside and outside the hydraulic tank 4; the squeezing bag 44 contains a one-way valve, so that when the squeezing bag 44 is squeezed, the desiccant is sprayed into the nozzle 45, and when the elasticity is restored, air is sucked through the one-way valve instead of the nozzle 45 to balance the pressure difference inside and outside the squeezing bag 44; When the wheel needs to rotate passively, the throttle of the electric vehicle is stationary, the electromagnetic clutch is turned on, and the driving member 36 and the transmission wheel 35 are connected, so that the transmission wheel 35 drives the wheel to rotate; when the wheel needs to rotate actively, the throttle of the electric vehicle is twisted, the electromagnetic clutch is closed, and the driving member 36 and the transmission wheel 35 are disconnected, so that the wheel drives the transmission wheel 35 to rotate. By increasing the connection of the electromagnetic clutch, when the wheel rotates actively, it can better drive the transmission wheel 35 to rotate, and avoid the transmission wheel 35 being affected by the rotation resistance of the driving member 36 and affecting the rotation of the transmission wheel 35, thereby improving the accuracy of the speed sensor 37 in detecting the transmission wheel 35, and then the speed detection of the wheel is more accurate; Specific work flow: During the wheel no-load test, the wheel rotates counterclockwise to contact the extrusion block 32. The extrusion block 32 is affected by the friction force with the wheel, so that the extrusion block 32 is pushed upward by the wheel. The extrusion block 32 drives the rotating shaft 3 to rotate through the extrusion groove 31, so that the wet cloth 34 located in the lower half of the rotating shaft 3 rotates to contact the wheel surface. While wetting the wheel surface, impurities are wiped off to improve the cleanliness of the wheel, thereby improving the clarity of the traces on the detection paper 27; the friction force generated by the wet cloth 34 wiping the wheel does not affect the test results when the wheel is no-load. If the tester is worried about being affected, he can choose to perform a no-load test when the wheel is not in contact, and after completion, the electric push rod 15 is raised and lowered to contact the wet cloth 34 and other parts, thereby increasing the flexibility of the test method and improving practicality; After the wheel is wetted or the no-load test is completed, the wheel enters a state where passive rotation of the wheel is required. The driving member 36 drives the transmission wheel 35 to rotate through the electromagnetic clutch, and the transmission wheel 35 drives the wheel to rotate clockwise. When the wheel rotates, the edge of the extrusion block 32 is stuck in the tread, so that the wheel drives the extrusion block 32 to move downward, so that the dry cloth 33 located in the upper half of the shaft 3 is rotated to contact the wheel surface, and the wet wheel is wiped dry. While improving the cleanliness of the wheel, the friction between the wheel and the rotating belt 26 is increased, so that they can better transmit to each other, avoiding slipping between the wheel and the detection paper 27, which affects the trace collection, thereby improving the clarity of the trace collection, and then improving the accuracy of the electric vehicle attribute identification; Furthermore, when the squeezing block 32 is pushed upward, the squeezing block 32 will go through a working process of being retracted into the squeezing groove 31 and then extended by the influence of the spring, and the squeezing block 32 drives the two No. 1 rods 42 to move, wherein one No. 1 rod 42 squeezes the hydraulic block 41, and presses the hydraulic block 41 into the hydraulic tank 4, and the cleaning agent in the hydraulic tank 4 is pressurized into the wet cloth 34 through the outlet pipe 43, and the cleaning agent content is increased before the wet cloth 34 wipes the wheel, so that the wet cloth 34 can fully wet the wheel surface, improve the cleaning effect, and thus improve the cleaning degree of the wheel; the other No. 1 rod 42 squeezes the squeezing capsule 44, and squeezes the desiccant in the squeezing capsule 44 into the leakage hole 46 in the dry cloth 33 through the nozzle 45, so as to absorb the moisture in the dry cloth 33 in advance, dry the dry cloth 33 in advance, and improve the wiping and drying ability of the dry cloth 33, so as to avoid the wet wheel from contacting the detection paper 27, thereby improving the clarity of the traces, and further improving the accuracy of the electric vehicle attribute identification; When the squeezing block 32 is pushed downward, the hydraulic tank 4 injects cleaning agent into the wet cloth 34 through the water outlet pipe 43, which is the same as the above process, so that the excess water in the wet cloth 34 flows out and drips, so as to achieve the effect of the cleaning agent cleaning the wet cloth 34 from the inside out, so that the wet cloth 34 can be cleaned, and the cleaning ability of the wet cloth 34 on the wheel is maintained to avoid contaminating the wheel tested subsequently; and the dry cloth 33 is also sprayed with desiccant again, so that the dry cloth 33 after wiping can be replenished with desiccant, absorb internal moisture, and maintain the wiping and drying ability of the dry cloth 33; and the leakage hole 46 is inclined, so that after the desiccant in the leakage hole 46 absorbs moisture, the dry cloth 33 rotates with the rotating shaft 3, so that the leakage hole 46 swings, so that the desiccant after absorbing moisture inside falls out of the dry cloth 33 through the leakage hole 46, so as to avoid the accumulation of desiccant and affect the work of the dry cloth 33.

[0021] Embodiment three: On the basis of the second embodiment, the surface of the extrusion block 32 away from the first rod 42 is evenly rotated and connected with a cam 47, and the outer ring of the cam 47 contacts the tire surface, and the cam 47 is located at the edge of both sides of the extrusion block 32; The bottom of the telescopic plate 28 is provided with an inclined plate 5, and one end of the inclined plate 5 is rotatably connected to a coating shaft 51, and a sponge 52 is provided at a portion of the inclined plate 5 close to the outer ring of the coating shaft 51, and the sponge 52 absorbs the paint stored in the inclined plate 5 and coats the surface of the coating shaft 51, and the coating shaft 51 is located below the wet cloth 34; Specific working process: after the extrusion block 32 is moved, the cam 47 at the edge of the extrusion block 32 contacts the tire, and the tire drives the cam 47 to rotate. On the one hand, the extrusion block 32 indirectly contacts the tire through the cam 47, so as to avoid the extrusion block 32 from scratching the tire for a long time, thereby causing damage to the tire surface and affecting the collection of traces; on the other hand, the rotation of the cam 47 enables the extrusion block 32 to repeatedly approach and move away from the tire, so that the extrusion block 32 forms a continuous swing, and the extrusion block 32 drives the rotating shaft 3 to rotate back and forth, and the rotating shaft 3 drives the dry cloth 33 and the wet cloth 34 to swing. The swing of the wet cloth 34 can form a reciprocating wiping action on the tire surface, thereby improving the wiping effect, thereby improving the cleaning effect. The swing of the dry cloth 33 can promote the desiccant in the leak hole 46 to fall off, thereby preventing the desiccant that absorbs moisture from being contaminated by the newly added desiccant, thereby improving the drying effect of the dry cloth 33. Furthermore, after the wheel cleaning is completed, the electric push rod 15 is lowered, so that the tire contacts the detection paper 27 and contacts the smearing shaft 51 at the same time. The tire drives the smearing shaft 51 to rotate, and the paint in the inclined plate 5 flows downward into the sponge 52 due to the inclination of the inclined plate 5. The sponge 52 smears the paint on the smearing shaft 51, and the smearing shaft 51 smears the paint on the tire surface. When the tire contacts the detection paper 27, the paint can highlight the traces of the tire more, improve the clarity of the traces, and thus improve the accuracy of the electric vehicle attribute identification; when the tire contacts the extrusion block 32 When the tire does not contact the coating shaft 51, the coating shaft 51 is located below the wet cloth 34, and the cleaning agent overflows from the wet cloth 34 and drips onto the inclined plate 5 and the coating shaft 51. The sponge 52 is used to wipe the dried and solidified pigment impurities on the coating shaft 51 to avoid excessive impurities such as pigment agglomeration on the coating shaft 51, which affect the coating of the pigment, thereby improving the clarity of the traces and further improving the accuracy of the identification of the attributes of the electric vehicle; the amount of cleaning agent contacting the coating shaft 51 and the cleaning agent will not affect the pigment and the coating work of the pigment.

[0022] Embodiment 4: On the basis of the third embodiment, the base 13 is rotatably connected to a winding shaft 53 through a torsion spring, and one end of the detection paper 27 on the rotating belt 26 is wound around the winding shaft 53; the edges of both sides of the rotating belt 26 are hinged with protrusions 54 through torsion springs, and the surface of the protrusions 54 contacting the tire is a stepped surface; The base 13 is provided with a spiral winding plate 55, and one end of the winding plate 55 is close to the winding shaft 53, and the other end is close to the rotating belt 26. The detection paper 27 on the rotating belt 26 passes through the winding plate 55 and is wound on the winding shaft 53. Specific working process: before the tire descends and contacts the rotating belt 26, it first contacts the protrusion 54. The tire width of each electric vehicle is not uniform. When the tire width becomes larger, the tire squeezes the protrusion 54 to swing at the hinged part, so that the stepped surface of the protrusion 54 can better contact the tire surface, increase the contact area between the tire and the rotating belt 26, so that the tire can better transmit the rotating belt 26 to avoid slipping, improve the clarity of the traces on the detection paper 27, and adapt to the trace collection of tires of different widths, thereby improving the scope of application; the rotating belt 26 drives the detection paper 27 to rotate, and the reel 53 affected by the torsion spring rotates to reel up the detection paper 27, and collects the detection paper 27 with traces on the surface to avoid repeated contact with the wheel; the tester can remove the detection paper 27 on the reel 53 or directly remove the reel 53; When the test paper 27 moves toward the winding shaft 53, it passes through the spiral winding plate 55, and the side of the test paper 27 without traces slides on the winding plate 55, while the side of the test paper 27 with traces is protected by the winding plate 55, so as to avoid the second layer of the test paper 27 rubbing against the first layer of the test paper 27 during winding, causing the traces on the test paper 27 to be destroyed, thereby increasing the protection measures for the trace samples and improving practicality; and when collecting tire traces, the protrusion 54 can be kept in contact with the tire, while the tire and the test paper 27 are not in contact, so that the tire first drives the test paper 27 to rotate through the protrusion 54, and then the tire contacts the test paper 27 and the rotating belt 26. In this way, there is a blank between each trace on the test paper 27, so as to achieve the purpose of separating each collected trace, so that the test personnel can more conveniently distinguish the tire trace samples of each vehicle.

[0023] Embodiment five: On the basis of the fourth embodiment, the bracket 14 is provided with a slide bar 6 on both sides, and the slide bar 6 is located on both sides of the wheel, and a slider 61 is slidably connected to the slide bar 6, and the slider 61 is fixed to the slide bar 6 by bolts; the sliders 61 are slidably connected to the sides close to each other with a clamping block 62, and the number of clamping blocks 62 on each slider 61 is two, and the clamping block 62 on each slider 61 is tightened and clamped by bolts; An extension block 63 is slidably connected to one side of the clamping block 62, and the extension block 63 is located between adjacent sliders 61; Specific work flow: If some electric vehicles have protective covers or other difficult-to-remove kits on their rear wheels, the axle of the electric vehicle's rear wheel cannot enter the groove 2. The tester holds the slider 61 and slides on the slide bar 6, clamps the clamping block 62 on the slider 61 on the fixing part at the rear of the electric vehicle, and tightens the clamping block 62 clamped up and down by bolts, and the clamping block 62 is fixed to the electric vehicle. Then the tester fixes the slider 61 and the slide bar 6 by bolts, so that the electric vehicle, the clamping block 62, the slider 61, and the slide bar 6 are fixed as a whole, so that the bracket 14 can drive the rear of the electric vehicle to rise or fall through the slide bar 6, so that the test system can adopt a variety of clamping methods to complete the test of the vehicle, thereby expanding the scope of application of the test system. By providing the extension block 63, the length of the clamping block 62 can be extended or shortened at will through the extension block 63, so as to cope with the situation of vehicles with different widths. If the vehicle is narrow, the extension block 63 is extended for clamping; if the vehicle is wide, the extension block 63 is shortened for clamping, thereby further expanding the applicable scope of the vehicle, thereby expanding the applicable scope of the measuring system and improving practicality.

Claims

1. A dynamometer system for electric vehicle attribute identification in trace forensic identification, comprising a dynamometer (1), a speed detection module (11) and a control module (12); characterized in that: Also includes: A base (13), the base (13) being arranged on one side of the dynamometer (1), and the base (13) being U-shaped; a bracket (14) being slidably connected to the top of the base (13), and an electric push rod (15) being arranged between one side of the bracket (14) and the base (13); a groove (2) being arranged on one side of the bracket (14), and a weighing plate (21) being slidably connected to the bottom of the groove (2) via a spring, the weighing plate (21) being located at the bottom of the groove (2) and being raised and lowered, a gravity sensor (22) being arranged between the weighing plate (21) and the groove (2), and the groove (2) being engaged with both ends of the electric wheel shaft; A fixing groove (23) is provided in the groove (2), and a fixing block (24) is slidably connected in the fixing groove (23) via a spring, and an electromagnet (25) is provided in the fixing groove (23), and the electromagnet (25) is energized to adsorb the fixing block (24); a rotating belt (26) is rotatably connected to the base (13), the rotating belt (26) is arc-shaped, one end of the rotating belt (26) is away from the dynamometer (1), and the other end is close to the dynamometer (1), and the rotating belt (26) is connected to a speed detection module (11) installed in the base (13), and a detection paper (27) is wound around the rotating belt (26); A telescopic plate (28) is slidably connected to the outer wall of the dynamometer (1) via a spring, and the telescopic plate (28) is telescoped into the dynamometer (1); a wire clamp (29) is connected to the bracket (14) via a spring, and the wire clamp (29) is used to detect the current in the circuit, and the wire clamp (29) clamps the power supply circuit of the electric vehicle.

2. A dynamometer system for electric vehicle attribute identification in trace forensic identification according to claim 1, characterized in that: The end of the telescopic plate (28) away from the dynamometer (1) is rotatably connected to a rotating shaft (3), and a torsion spring is provided between the rotating shaft (3) and the telescopic plate (28); an extrusion groove (31) is provided on the surface of the rotating shaft (3), the extrusion groove (31) is horizontally arranged, and an extrusion block (32) is slidably connected in the extrusion groove (31) via a spring; a dry cloth (33) and a wet cloth (34) are respectively provided on the surface of the rotating shaft (3), and the dry cloth (33) and the wet cloth (34) are respectively located on both sides of the extrusion block (32) The dry cloth (33) is located above the wet cloth (34), and the dry cloth (33), the wet cloth (34) and the extrusion wheel all contact the wheel surface; one side of the bracket (14) is rotatably connected to a transmission wheel (35), and the transmission wheel (35) is connected to a driving member (36) provided on one side of the bracket (14) through an electromagnetic clutch, and the transmission wheel (35) contacts the wheel hub of the electric wheel; a rotation speed sensor (37) is provided on one side of the bracket (14), and the rotation speed sensor (37) is used to detect the rotation speed of the transmission wheel (35).

3. A dynamometer system for electric vehicle attribute identification in trace forensic identification according to claim 2, characterized in that: A hydraulic tank (4) is provided inside the rotating shaft (3), and a cleaning agent is stored in the hydraulic tank (4). A hydraulic block (41) is slidably connected to the hydraulic tank (4) via a spring, and a No. 1 rod (42) is evenly provided at the bottom of the squeezing block (32), and the No. 1 rod (42) contacts the hydraulic block (41). A water outlet pipe (43) is evenly provided inside the rotating shaft (3), and one end of the water outlet pipe (43) extends into the wet cloth (34), and the other end extends into the hydraulic tank (4).

4. A dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 3, characterized in that: The rotating shaft (3) is provided with an extrusion bag (44), and a desiccant is stored in the extrusion bag (44). A nozzle (45) is provided in the extrusion bag (44), and one end of the nozzle (45) extends into the dry cloth (33). A No. 1 rod (42) is arranged at the bottom of the extrusion block (32), one of which contacts the hydraulic block (41) and the other contacts the extrusion bag (44). Leakage holes (46) are evenly opened in the dry cloth (33), one end of the leakage hole (46) contacts the nozzle (45) and the other end faces the outside of the dry cloth (33), and the nozzle (45) sprays the desiccant into the leakage hole (46).

5. A dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 4, characterized in that: The surface of the extrusion block (32) away from the first rod (42) is evenly rotatably connected to a cam (47), and the outer ring of the cam (47) contacts the tire surface. The cam (47) is located at the edge of both sides of the extrusion block (32).

6. The dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 2, characterized in that: The bottom of the telescopic plate (28) is provided with an inclined plate (5), and one end of the inclined plate (5) is rotatably connected to a coating shaft (51). A sponge (52) is provided at a portion of the inclined plate (5) close to the outer ring of the coating shaft (51). The sponge (52) absorbs the paint stored in the inclined plate (5) and coats the paint on the surface of the coating shaft (51). The coating shaft (51) is located below the wet cloth (34).

7. The dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 1, characterized in that: The base (13) is rotatably connected to a reel (53) via a torsion spring, and one end of the detection paper (27) on the rotating belt (26) is wound around the reel (53); protrusions (54) are hingedly connected to the edges of both sides of the rotating belt (26) via torsion springs, and the surface of the protrusions (54) contacting the tire is a stepped surface.

8. A dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 7, characterized in that: The base (13) is provided with a spiral winding plate (55), one end of the winding plate (55) is close to the winding shaft (53), and the other end is close to the rotating belt (26). The detection paper (27) on the rotating belt (26) passes through the winding plate (55) and is wound on the winding shaft (53).

9. The dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 7, characterized in that: Slide bars (6) are provided on both sides of the bracket (14), and the slide bars (6) are located on both sides of the wheel. The slide bars (6) are slidably connected with sliders (61), and the sliders (61) are fixed to the slide bars (6) by bolts. A clamping block (62) is slidably connected to the sides of the sliders (61) that are close to each other, and the number of clamping blocks (62) on each slider (61) is two, and the clamping blocks (62) on each slider (61) are tightened and clamped by bolts.

10. A dynamometer system for electric vehicle attribute identification in forensic trace identification according to claim 9, characterized in that: One side of the clamping block (62) is slidably connected to an extension block (63), and the extension block (63) is located between adjacent sliding blocks (61).

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